| File: | build-scan/../src/resolve/resolved-dns-transaction.c |
| Warning: | line 646, column 17 Value stored to 'fd' is never read |
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| 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
| 2 | |
| 3 | #include "sd-messages.h" |
| 4 | |
| 5 | #include "af-list.h" |
| 6 | #include "alloc-util.h" |
| 7 | #include "dns-domain.h" |
| 8 | #include "errno-list.h" |
| 9 | #include "fd-util.h" |
| 10 | #include "random-util.h" |
| 11 | #include "resolved-dns-cache.h" |
| 12 | #include "resolved-dns-transaction.h" |
| 13 | #include "resolved-llmnr.h" |
| 14 | #include "string-table.h" |
| 15 | |
| 16 | #if ENABLE_DNS_OVER_TLS1 |
| 17 | #include <gnutls/socket.h> |
| 18 | #endif |
| 19 | |
| 20 | #define TRANSACTIONS_MAX4096 4096 |
| 21 | #define TRANSACTION_TCP_TIMEOUT_USEC(10U*((usec_t) 1000000ULL)) (10U*USEC_PER_SEC((usec_t) 1000000ULL)) |
| 22 | |
| 23 | /* After how much time to repeat classic DNS requests */ |
| 24 | #define DNS_TIMEOUT_USEC((120 * ((usec_t) 1000000ULL)) / 24) (SD_RESOLVED_QUERY_TIMEOUT_USEC(120 * ((usec_t) 1000000ULL)) / DNS_TRANSACTION_ATTEMPTS_MAX24) |
| 25 | |
| 26 | static void dns_transaction_reset_answer(DnsTransaction *t) { |
| 27 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 27, __PRETTY_FUNCTION__); } while (0); |
| 28 | |
| 29 | t->received = dns_packet_unref(t->received); |
| 30 | t->answer = dns_answer_unref(t->answer); |
| 31 | t->answer_rcode = 0; |
| 32 | t->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
| 33 | t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID; |
| 34 | t->answer_authenticated = false0; |
| 35 | t->answer_nsec_ttl = (uint32_t) -1; |
| 36 | t->answer_errno = 0; |
| 37 | } |
| 38 | |
| 39 | static void dns_transaction_flush_dnssec_transactions(DnsTransaction *t) { |
| 40 | DnsTransaction *z; |
| 41 | |
| 42 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 42, __PRETTY_FUNCTION__); } while (0); |
| 43 | |
| 44 | while ((z = set_steal_first(t->dnssec_transactions))) { |
| 45 | set_remove(z->notify_transactions, t); |
| 46 | set_remove(z->notify_transactions_done, t); |
| 47 | dns_transaction_gc(z); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | static void dns_transaction_close_connection(DnsTransaction *t) { |
| 52 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 52, __PRETTY_FUNCTION__); } while (0); |
| 53 | |
| 54 | if (t->stream) { |
| 55 | /* Let's detach the stream from our transaction, in case something else keeps a reference to it. */ |
| 56 | LIST_REMOVE(transactions_by_stream, t->stream->transactions, t)do { typeof(*(t->stream->transactions)) **_head = & (t->stream->transactions), *_item = (t); do { if ((__builtin_expect (!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-transaction.c", 56, __PRETTY_FUNCTION__ ); } while (0); if (_item->transactions_by_stream_next) _item ->transactions_by_stream_next->transactions_by_stream_prev = _item->transactions_by_stream_prev; if (_item->transactions_by_stream_prev ) _item->transactions_by_stream_prev->transactions_by_stream_next = _item->transactions_by_stream_next; else { do { if ((__builtin_expect (!!(!(*_head == _item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD , ("*_head == _item"), "../src/resolve/resolved-dns-transaction.c" , 56, __PRETTY_FUNCTION__); } while (0); *_head = _item->transactions_by_stream_next ; } _item->transactions_by_stream_next = _item->transactions_by_stream_prev = ((void*)0); } while (0); |
| 57 | |
| 58 | /* Remove packet in case it's still in the queue */ |
| 59 | dns_packet_unref(ordered_set_remove(t->stream->write_queue, t->sent)); |
| 60 | |
| 61 | t->stream = dns_stream_unref(t->stream); |
| 62 | } |
| 63 | |
| 64 | t->dns_udp_event_source = sd_event_source_unref(t->dns_udp_event_source); |
| 65 | t->dns_udp_fd = safe_close(t->dns_udp_fd); |
| 66 | } |
| 67 | |
| 68 | static void dns_transaction_stop_timeout(DnsTransaction *t) { |
| 69 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 69, __PRETTY_FUNCTION__); } while (0); |
| 70 | |
| 71 | t->timeout_event_source = sd_event_source_unref(t->timeout_event_source); |
| 72 | } |
| 73 | |
| 74 | DnsTransaction* dns_transaction_free(DnsTransaction *t) { |
| 75 | DnsQueryCandidate *c; |
| 76 | DnsZoneItem *i; |
| 77 | DnsTransaction *z; |
| 78 | |
| 79 | if (!t) |
| 80 | return NULL((void*)0); |
| 81 | |
| 82 | log_debug("Freeing transaction %" PRIu16 ".", t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 82, __func__, "Freeing transaction %" "u" ".", t->id) : -abs(_e); }); |
| 83 | |
| 84 | dns_transaction_close_connection(t); |
| 85 | dns_transaction_stop_timeout(t); |
| 86 | |
| 87 | dns_packet_unref(t->sent); |
| 88 | dns_transaction_reset_answer(t); |
| 89 | |
| 90 | dns_server_unref(t->server); |
| 91 | |
| 92 | if (t->scope) { |
| 93 | hashmap_remove_value(t->scope->transactions_by_key, t->key, t); |
| 94 | LIST_REMOVE(transactions_by_scope, t->scope->transactions, t)do { typeof(*(t->scope->transactions)) **_head = &( t->scope->transactions), *_item = (t); do { if ((__builtin_expect (!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-transaction.c", 94, __PRETTY_FUNCTION__ ); } while (0); if (_item->transactions_by_scope_next) _item ->transactions_by_scope_next->transactions_by_scope_prev = _item->transactions_by_scope_prev; if (_item->transactions_by_scope_prev ) _item->transactions_by_scope_prev->transactions_by_scope_next = _item->transactions_by_scope_next; else { do { if ((__builtin_expect (!!(!(*_head == _item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD , ("*_head == _item"), "../src/resolve/resolved-dns-transaction.c" , 94, __PRETTY_FUNCTION__); } while (0); *_head = _item->transactions_by_scope_next ; } _item->transactions_by_scope_next = _item->transactions_by_scope_prev = ((void*)0); } while (0); |
| 95 | |
| 96 | if (t->id != 0) |
| 97 | hashmap_remove(t->scope->manager->dns_transactions, UINT_TO_PTR(t->id)((void *) ((uintptr_t) (t->id)))); |
| 98 | } |
| 99 | |
| 100 | while ((c = set_steal_first(t->notify_query_candidates))) |
| 101 | set_remove(c->transactions, t); |
| 102 | set_free(t->notify_query_candidates); |
| 103 | |
| 104 | while ((c = set_steal_first(t->notify_query_candidates_done))) |
| 105 | set_remove(c->transactions, t); |
| 106 | set_free(t->notify_query_candidates_done); |
| 107 | |
| 108 | while ((i = set_steal_first(t->notify_zone_items))) |
| 109 | i->probe_transaction = NULL((void*)0); |
| 110 | set_free(t->notify_zone_items); |
| 111 | |
| 112 | while ((i = set_steal_first(t->notify_zone_items_done))) |
| 113 | i->probe_transaction = NULL((void*)0); |
| 114 | set_free(t->notify_zone_items_done); |
| 115 | |
| 116 | while ((z = set_steal_first(t->notify_transactions))) |
| 117 | set_remove(z->dnssec_transactions, t); |
| 118 | set_free(t->notify_transactions); |
| 119 | |
| 120 | while ((z = set_steal_first(t->notify_transactions_done))) |
| 121 | set_remove(z->dnssec_transactions, t); |
| 122 | set_free(t->notify_transactions_done); |
| 123 | |
| 124 | dns_transaction_flush_dnssec_transactions(t); |
| 125 | set_free(t->dnssec_transactions); |
| 126 | |
| 127 | dns_answer_unref(t->validated_keys); |
| 128 | dns_resource_key_unref(t->key); |
| 129 | |
| 130 | return mfree(t); |
| 131 | } |
| 132 | |
| 133 | DEFINE_TRIVIAL_CLEANUP_FUNC(DnsTransaction*, dns_transaction_free)static inline void dns_transaction_freep(DnsTransaction* *p) { if (*p) dns_transaction_free(*p); }; |
| 134 | |
| 135 | bool_Bool dns_transaction_gc(DnsTransaction *t) { |
| 136 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 136, __PRETTY_FUNCTION__); } while (0); |
| 137 | |
| 138 | if (t->block_gc > 0) |
| 139 | return true1; |
| 140 | |
| 141 | if (set_isempty(t->notify_query_candidates) && |
| 142 | set_isempty(t->notify_query_candidates_done) && |
| 143 | set_isempty(t->notify_zone_items) && |
| 144 | set_isempty(t->notify_zone_items_done) && |
| 145 | set_isempty(t->notify_transactions) && |
| 146 | set_isempty(t->notify_transactions_done)) { |
| 147 | dns_transaction_free(t); |
| 148 | return false0; |
| 149 | } |
| 150 | |
| 151 | return true1; |
| 152 | } |
| 153 | |
| 154 | static uint16_t pick_new_id(Manager *m) { |
| 155 | uint16_t new_id; |
| 156 | |
| 157 | /* Find a fresh, unused transaction id. Note that this loop is bounded because there's a limit on the number of |
| 158 | * transactions, and it's much lower than the space of IDs. */ |
| 159 | |
| 160 | assert_cc(TRANSACTIONS_MAX < 0xFFFF)GCC diagnostic push
; GCC diagnostic ignored "-Wdeclaration-after-statement" ; struct _assert_struct_20 { char x[(4096 < 0xFFFF) ? 0 : -1]; }; GCC diagnostic pop ; |
| 161 | |
| 162 | do |
| 163 | random_bytes(&new_id, sizeof(new_id)); |
| 164 | while (new_id == 0 || |
| 165 | hashmap_get(m->dns_transactions, UINT_TO_PTR(new_id)((void *) ((uintptr_t) (new_id))))); |
| 166 | |
| 167 | return new_id; |
| 168 | } |
| 169 | |
| 170 | int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key) { |
| 171 | _cleanup_(dns_transaction_freep)__attribute__((cleanup(dns_transaction_freep))) DnsTransaction *t = NULL((void*)0); |
| 172 | int r; |
| 173 | |
| 174 | assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("ret"), "../src/resolve/resolved-dns-transaction.c" , 174, __PRETTY_FUNCTION__); } while (0); |
| 175 | assert(s)do { if ((__builtin_expect(!!(!(s)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("s"), "../src/resolve/resolved-dns-transaction.c" , 175, __PRETTY_FUNCTION__); } while (0); |
| 176 | assert(key)do { if ((__builtin_expect(!!(!(key)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("key"), "../src/resolve/resolved-dns-transaction.c" , 176, __PRETTY_FUNCTION__); } while (0); |
| 177 | |
| 178 | /* Don't allow looking up invalid or pseudo RRs */ |
| 179 | if (!dns_type_is_valid_query(key->type)) |
| 180 | return -EINVAL22; |
| 181 | if (dns_type_is_obsolete(key->type)) |
| 182 | return -EOPNOTSUPP95; |
| 183 | |
| 184 | /* We only support the IN class */ |
| 185 | if (!IN_SET(key->class, DNS_CLASS_IN, DNS_CLASS_ANY)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_CLASS_IN, DNS_CLASS_ANY})/sizeof(int )]; switch(key->class) { case DNS_CLASS_IN: case DNS_CLASS_ANY : _found = 1; break; default: break; } _found; })) |
| 186 | return -EOPNOTSUPP95; |
| 187 | |
| 188 | if (hashmap_size(s->manager->dns_transactions) >= TRANSACTIONS_MAX4096) |
| 189 | return -EBUSY16; |
| 190 | |
| 191 | r = hashmap_ensure_allocated(&s->manager->dns_transactions, NULL)internal_hashmap_ensure_allocated(&s->manager->dns_transactions , ((void*)0) ); |
| 192 | if (r < 0) |
| 193 | return r; |
| 194 | |
| 195 | r = hashmap_ensure_allocated(&s->transactions_by_key, &dns_resource_key_hash_ops)internal_hashmap_ensure_allocated(&s->transactions_by_key , &dns_resource_key_hash_ops ); |
| 196 | if (r < 0) |
| 197 | return r; |
| 198 | |
| 199 | t = new0(DnsTransaction, 1)((DnsTransaction*) calloc((1), sizeof(DnsTransaction))); |
| 200 | if (!t) |
| 201 | return -ENOMEM12; |
| 202 | |
| 203 | t->dns_udp_fd = -1; |
| 204 | t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID; |
| 205 | t->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
| 206 | t->answer_nsec_ttl = (uint32_t) -1; |
| 207 | t->key = dns_resource_key_ref(key); |
| 208 | t->current_feature_level = _DNS_SERVER_FEATURE_LEVEL_INVALID; |
| 209 | t->clamp_feature_level = _DNS_SERVER_FEATURE_LEVEL_INVALID; |
| 210 | |
| 211 | t->id = pick_new_id(s->manager); |
| 212 | |
| 213 | r = hashmap_put(s->manager->dns_transactions, UINT_TO_PTR(t->id)((void *) ((uintptr_t) (t->id))), t); |
| 214 | if (r < 0) { |
| 215 | t->id = 0; |
| 216 | return r; |
| 217 | } |
| 218 | |
| 219 | r = hashmap_replace(s->transactions_by_key, t->key, t); |
| 220 | if (r < 0) { |
| 221 | hashmap_remove(s->manager->dns_transactions, UINT_TO_PTR(t->id)((void *) ((uintptr_t) (t->id)))); |
| 222 | return r; |
| 223 | } |
| 224 | |
| 225 | LIST_PREPEND(transactions_by_scope, s->transactions, t)do { typeof(*(s->transactions)) **_head = &(s->transactions ), *_item = (t); do { if ((__builtin_expect(!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-transaction.c" , 225, __PRETTY_FUNCTION__); } while (0); if ((_item->transactions_by_scope_next = *_head)) _item->transactions_by_scope_next->transactions_by_scope_prev = _item; _item->transactions_by_scope_prev = ((void*)0); * _head = _item; } while (0); |
| 226 | t->scope = s; |
| 227 | |
| 228 | s->manager->n_transactions_total++; |
| 229 | |
| 230 | if (ret) |
| 231 | *ret = t; |
| 232 | |
| 233 | t = NULL((void*)0); |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static void dns_transaction_shuffle_id(DnsTransaction *t) { |
| 239 | uint16_t new_id; |
| 240 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 240, __PRETTY_FUNCTION__); } while (0); |
| 241 | |
| 242 | /* Pick a new ID for this transaction. */ |
| 243 | |
| 244 | new_id = pick_new_id(t->scope->manager); |
| 245 | assert_se(hashmap_remove_and_put(t->scope->manager->dns_transactions, UINT_TO_PTR(t->id), UINT_TO_PTR(new_id), t) >= 0)do { if ((__builtin_expect(!!(!(hashmap_remove_and_put(t-> scope->manager->dns_transactions, ((void *) ((uintptr_t ) (t->id))), ((void *) ((uintptr_t) (new_id))), t) >= 0 )),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("hashmap_remove_and_put(t->scope->manager->dns_transactions, UINT_TO_PTR(t->id), UINT_TO_PTR(new_id), t) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 245, __PRETTY_FUNCTION__ ); } while (0); |
| 246 | |
| 247 | log_debug("Transaction %" PRIu16 " is now %" PRIu16 ".", t->id, new_id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 247, __func__, "Transaction %" "u" " is now %" "u" ".", t->id, new_id) : -abs(_e); }); |
| 248 | t->id = new_id; |
| 249 | |
| 250 | /* Make sure we generate a new packet with the new ID */ |
| 251 | t->sent = dns_packet_unref(t->sent); |
| 252 | } |
| 253 | |
| 254 | static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) { |
| 255 | _cleanup_free___attribute__((cleanup(freep))) char *pretty = NULL((void*)0); |
| 256 | char key_str[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 257 | DnsZoneItem *z; |
| 258 | |
| 259 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 259, __PRETTY_FUNCTION__); } while (0); |
| 260 | assert(p)do { if ((__builtin_expect(!!(!(p)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("p"), "../src/resolve/resolved-dns-transaction.c" , 260, __PRETTY_FUNCTION__); } while (0); |
| 261 | |
| 262 | if (manager_our_packet(t->scope->manager, p) != 0) |
| 263 | return; |
| 264 | |
| 265 | (void) in_addr_to_string(p->family, &p->sender, &pretty); |
| 266 | |
| 267 | log_debug("Transaction %" PRIu16 " for <%s> on scope %s on %s/%s got tentative packet from %s.",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }) |
| 268 | t->id,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }) |
| 269 | dns_resource_key_to_string(t->key, key_str, sizeof key_str),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }) |
| 270 | dns_protocol_to_string(t->scope->protocol),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }) |
| 271 | t->scope->link ? t->scope->link->name : "*",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }) |
| 272 | af_to_name_short(t->scope->family),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }) |
| 273 | strnull(pretty))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 273, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s got tentative packet from %s." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), strnull(pretty)) : -abs(_e); }); |
| 274 | |
| 275 | /* RFC 4795, Section 4.1 says that the peer with the |
| 276 | * lexicographically smaller IP address loses */ |
| 277 | if (memcmp(&p->sender, &p->destination, FAMILY_ADDRESS_SIZE(p->family)) >= 0) { |
| 278 | log_debug("Peer has lexicographically larger IP address and thus lost in the conflict.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 278, __func__, "Peer has lexicographically larger IP address and thus lost in the conflict." ) : -abs(_e); }); |
| 279 | return; |
| 280 | } |
| 281 | |
| 282 | log_debug("We have the lexicographically larger IP address and thus lost in the conflict.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 282, __func__, "We have the lexicographically larger IP address and thus lost in the conflict." ) : -abs(_e); }); |
| 283 | |
| 284 | t->block_gc++; |
| 285 | |
| 286 | while ((z = set_first(t->notify_zone_items))) { |
| 287 | /* First, make sure the zone item drops the reference |
| 288 | * to us */ |
| 289 | dns_zone_item_probe_stop(z); |
| 290 | |
| 291 | /* Secondly, report this as conflict, so that we might |
| 292 | * look for a different hostname */ |
| 293 | dns_zone_item_conflict(z); |
| 294 | } |
| 295 | t->block_gc--; |
| 296 | |
| 297 | dns_transaction_gc(t); |
| 298 | } |
| 299 | |
| 300 | void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) { |
| 301 | DnsQueryCandidate *c; |
| 302 | DnsZoneItem *z; |
| 303 | DnsTransaction *d; |
| 304 | const char *st; |
| 305 | char key_str[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 306 | |
| 307 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 307, __PRETTY_FUNCTION__); } while (0); |
| 308 | assert(!DNS_TRANSACTION_IS_LIVE(state))do { if ((__builtin_expect(!!(!(!({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended[20 - sizeof((int[]){DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING , DNS_TRANSACTION_VALIDATING})/sizeof(int)]; switch((state)) { case DNS_TRANSACTION_NULL: case DNS_TRANSACTION_PENDING: case DNS_TRANSACTION_VALIDATING: _found = 1; break; default: break ; } _found; }))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD , ("!DNS_TRANSACTION_IS_LIVE(state)"), "../src/resolve/resolved-dns-transaction.c" , 308, __PRETTY_FUNCTION__); } while (0); |
| 309 | |
| 310 | if (state == DNS_TRANSACTION_DNSSEC_FAILED) { |
| 311 | dns_resource_key_to_string(t->key, key_str, sizeof key_str); |
| 312 | |
| 313 | log_struct(LOG_NOTICE,log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 314 | "MESSAGE_ID=" SD_MESSAGE_DNSSEC_FAILURE_STR,log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 315 | LOG_MESSAGE("DNSSEC validation failed for question %s: %s", key_str, dnssec_result_to_string(t->answer_dnssec_result)),log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 316 | "DNS_TRANSACTION=%" PRIu16, t->id,log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 317 | "DNS_QUESTION=%s", key_str,log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 318 | "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result),log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 319 | "DNS_SERVER=%s", dns_server_string(t->server),log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)) |
| 320 | "DNS_SERVER_FEATURE_LEVEL=%s", dns_server_feature_level_to_string(t->server->possible_feature_level))log_struct_internal(((LOG_REALM_SYSTEMD) << 10 | (5)), 0 , "../src/resolve/resolved-dns-transaction.c", 320, __func__, "MESSAGE_ID=" "16" "75" "d7" "f1" "72" "17" "40" "98" "b1" "10" "8b" "f8" "c7" "dc" "8f" "5d", "MESSAGE=" "DNSSEC validation failed for question %s: %s" , key_str, dnssec_result_to_string(t->answer_dnssec_result ), "DNS_TRANSACTION=%" "u", t->id, "DNS_QUESTION=%s", key_str , "DNSSEC_RESULT=%s", dnssec_result_to_string(t->answer_dnssec_result ), "DNS_SERVER=%s", dns_server_string(t->server), "DNS_SERVER_FEATURE_LEVEL=%s" , dns_server_feature_level_to_string(t->server->possible_feature_level ), ((void*)0)); |
| 321 | } |
| 322 | |
| 323 | /* Note that this call might invalidate the query. Callers |
| 324 | * should hence not attempt to access the query or transaction |
| 325 | * after calling this function. */ |
| 326 | |
| 327 | if (state == DNS_TRANSACTION_ERRNO) |
| 328 | st = errno_to_name(t->answer_errno); |
| 329 | else |
| 330 | st = dns_transaction_state_to_string(state); |
| 331 | |
| 332 | log_debug("Transaction %" PRIu16 " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 333 | t->id,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 334 | dns_resource_key_to_string(t->key, key_str, sizeof key_str),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 335 | dns_protocol_to_string(t->scope->protocol),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 336 | t->scope->link ? t->scope->link->name : "*",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 337 | af_to_name_short(t->scope->family),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 338 | st,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 339 | t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }) |
| 340 | t->answer_authenticated ? "authenticated" : "unsigned")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 340, __func__, "Transaction %" "u" " for <%s> on scope %s on %s/%s now complete with <%s> from %s (%s)." , t->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family), st, t->answer_source < 0 ? "none" : dns_transaction_source_to_string(t->answer_source), t-> answer_authenticated ? "authenticated" : "unsigned") : -abs(_e ); }); |
| 341 | |
| 342 | t->state = state; |
| 343 | |
| 344 | dns_transaction_close_connection(t); |
| 345 | dns_transaction_stop_timeout(t); |
| 346 | |
| 347 | /* Notify all queries that are interested, but make sure the |
| 348 | * transaction isn't freed while we are still looking at it */ |
| 349 | t->block_gc++; |
| 350 | |
| 351 | SET_FOREACH_MOVE(c, t->notify_query_candidates_done, t->notify_query_candidates)for (; ({ c = set_first(t->notify_query_candidates); do { if ((__builtin_expect(!!(!(!c || set_move_one(t->notify_query_candidates_done , t->notify_query_candidates, c) >= 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("!c || set_move_one(t->notify_query_candidates_done, t->notify_query_candidates, c) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 351, __PRETTY_FUNCTION__ ); } while (0); c; }); ) |
| 352 | dns_query_candidate_notify(c); |
| 353 | SWAP_TWO(t->notify_query_candidates, t->notify_query_candidates_done)do { typeof(t->notify_query_candidates) _t = (t->notify_query_candidates ); (t->notify_query_candidates) = (t->notify_query_candidates_done ); (t->notify_query_candidates_done) = (_t); } while (0); |
| 354 | |
| 355 | SET_FOREACH_MOVE(z, t->notify_zone_items_done, t->notify_zone_items)for (; ({ z = set_first(t->notify_zone_items); do { if ((__builtin_expect (!!(!(!z || set_move_one(t->notify_zone_items_done, t-> notify_zone_items, z) >= 0)),0))) log_assert_failed_realm( LOG_REALM_SYSTEMD, ("!z || set_move_one(t->notify_zone_items_done, t->notify_zone_items, z) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 355, __PRETTY_FUNCTION__ ); } while (0); z; }); ) |
| 356 | dns_zone_item_notify(z); |
| 357 | SWAP_TWO(t->notify_zone_items, t->notify_zone_items_done)do { typeof(t->notify_zone_items) _t = (t->notify_zone_items ); (t->notify_zone_items) = (t->notify_zone_items_done) ; (t->notify_zone_items_done) = (_t); } while (0); |
| 358 | if (t->probing && t->state == DNS_TRANSACTION_ATTEMPTS_MAX_REACHED) |
| 359 | (void) dns_scope_announce(t->scope, false0); |
| 360 | |
| 361 | SET_FOREACH_MOVE(d, t->notify_transactions_done, t->notify_transactions)for (; ({ d = set_first(t->notify_transactions); do { if ( (__builtin_expect(!!(!(!d || set_move_one(t->notify_transactions_done , t->notify_transactions, d) >= 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("!d || set_move_one(t->notify_transactions_done, t->notify_transactions, d) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 361, __PRETTY_FUNCTION__ ); } while (0); d; }); ) |
| 362 | dns_transaction_notify(d, t); |
| 363 | SWAP_TWO(t->notify_transactions, t->notify_transactions_done)do { typeof(t->notify_transactions) _t = (t->notify_transactions ); (t->notify_transactions) = (t->notify_transactions_done ); (t->notify_transactions_done) = (_t); } while (0); |
| 364 | |
| 365 | t->block_gc--; |
| 366 | dns_transaction_gc(t); |
| 367 | } |
| 368 | |
| 369 | static int dns_transaction_pick_server(DnsTransaction *t) { |
| 370 | DnsServer *server; |
| 371 | |
| 372 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 372, __PRETTY_FUNCTION__); } while (0); |
| 373 | assert(t->scope->protocol == DNS_PROTOCOL_DNS)do { if ((__builtin_expect(!!(!(t->scope->protocol == DNS_PROTOCOL_DNS )),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("t->scope->protocol == DNS_PROTOCOL_DNS" ), "../src/resolve/resolved-dns-transaction.c", 373, __PRETTY_FUNCTION__ ); } while (0); |
| 374 | |
| 375 | /* Pick a DNS server and a feature level for it. */ |
| 376 | |
| 377 | server = dns_scope_get_dns_server(t->scope); |
| 378 | if (!server) |
| 379 | return -ESRCH3; |
| 380 | |
| 381 | /* If we changed the server invalidate the feature level clamping, as the new server might have completely |
| 382 | * different properties. */ |
| 383 | if (server != t->server) |
| 384 | t->clamp_feature_level = _DNS_SERVER_FEATURE_LEVEL_INVALID; |
| 385 | |
| 386 | t->current_feature_level = dns_server_possible_feature_level(server); |
| 387 | |
| 388 | /* Clamp the feature level if that is requested. */ |
| 389 | if (t->clamp_feature_level != _DNS_SERVER_FEATURE_LEVEL_INVALID && |
| 390 | t->current_feature_level > t->clamp_feature_level) |
| 391 | t->current_feature_level = t->clamp_feature_level; |
| 392 | |
| 393 | log_debug("Using feature level %s for transaction %u.", dns_server_feature_level_to_string(t->current_feature_level), t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 393, __func__, "Using feature level %s for transaction %u.", dns_server_feature_level_to_string (t->current_feature_level), t->id) : -abs(_e); }); |
| 394 | |
| 395 | if (server == t->server) |
| 396 | return 0; |
| 397 | |
| 398 | dns_server_unref(t->server); |
| 399 | t->server = dns_server_ref(server); |
| 400 | |
| 401 | t->n_picked_servers ++; |
| 402 | |
| 403 | log_debug("Using DNS server %s for transaction %u.", dns_server_string(t->server), t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 403, __func__, "Using DNS server %s for transaction %u.", dns_server_string (t->server), t->id) : -abs(_e); }); |
| 404 | |
| 405 | return 1; |
| 406 | } |
| 407 | |
| 408 | static void dns_transaction_retry(DnsTransaction *t, bool_Bool next_server) { |
| 409 | int r; |
| 410 | |
| 411 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 411, __PRETTY_FUNCTION__); } while (0); |
| 412 | |
| 413 | log_debug("Retrying transaction %" PRIu16 ".", t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 413, __func__, "Retrying transaction %" "u" ".", t->id) : -abs(_e); }); |
| 414 | |
| 415 | /* Before we try again, switch to a new server. */ |
| 416 | if (next_server) |
| 417 | dns_scope_next_dns_server(t->scope); |
| 418 | |
| 419 | r = dns_transaction_go(t); |
| 420 | if (r < 0) { |
| 421 | t->answer_errno = -r; |
| 422 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | static int dns_transaction_maybe_restart(DnsTransaction *t) { |
| 427 | int r; |
| 428 | |
| 429 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 429, __PRETTY_FUNCTION__); } while (0); |
| 430 | |
| 431 | /* Returns > 0 if the transaction was restarted, 0 if not */ |
| 432 | |
| 433 | if (!t->server) |
| 434 | return 0; |
| 435 | |
| 436 | if (t->current_feature_level <= dns_server_possible_feature_level(t->server)) |
| 437 | return 0; |
| 438 | |
| 439 | /* The server's current feature level is lower than when we sent the original query. We learnt something from |
| 440 | the response or possibly an auxiliary DNSSEC response that we didn't know before. We take that as reason to |
| 441 | restart the whole transaction. This is a good idea to deal with servers that respond rubbish if we include |
| 442 | OPT RR or DO bit. One of these cases is documented here, for example: |
| 443 | https://open.nlnetlabs.nl/pipermail/dnssec-trigger/2014-November/000376.html */ |
| 444 | |
| 445 | log_debug("Server feature level is now lower than when we began our transaction. Restarting with new ID.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 445, __func__, "Server feature level is now lower than when we began our transaction. Restarting with new ID." ) : -abs(_e); }); |
| 446 | dns_transaction_shuffle_id(t); |
| 447 | |
| 448 | r = dns_transaction_go(t); |
| 449 | if (r < 0) |
| 450 | return r; |
| 451 | |
| 452 | return 1; |
| 453 | } |
| 454 | |
| 455 | static void on_transaction_stream_error(DnsTransaction *t, int error) { |
| 456 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 456, __PRETTY_FUNCTION__); } while (0); |
| 457 | |
| 458 | dns_transaction_close_connection(t); |
| 459 | |
| 460 | if (ERRNO_IS_DISCONNECT(error)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){107, 104, 111, 103, 32, 101})/sizeof(int )]; switch(error) { case 107: case 104: case 111: case 103: case 32: case 101: _found = 1; break; default: break; } _found; } )) { |
| 461 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR) { |
| 462 | /* If the LLMNR/TCP connection failed, the host doesn't support LLMNR, and we cannot answer the |
| 463 | * question on this scope. */ |
| 464 | dns_transaction_complete(t, DNS_TRANSACTION_NOT_FOUND); |
| 465 | return; |
| 466 | } |
| 467 | |
| 468 | dns_transaction_retry(t, true1); |
| 469 | return; |
| 470 | } |
| 471 | if (error != 0) { |
| 472 | t->answer_errno = error; |
| 473 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | static int dns_transaction_on_stream_packet(DnsTransaction *t, DnsPacket *p) { |
| 478 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 478, __PRETTY_FUNCTION__); } while (0); |
| 479 | assert(p)do { if ((__builtin_expect(!!(!(p)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("p"), "../src/resolve/resolved-dns-transaction.c" , 479, __PRETTY_FUNCTION__); } while (0); |
| 480 | |
| 481 | dns_transaction_close_connection(t); |
| 482 | |
| 483 | if (dns_packet_validate_reply(p) <= 0) { |
| 484 | log_debug("Invalid TCP reply packet.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 484, __func__, "Invalid TCP reply packet.") : -abs(_e); }); |
| 485 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | dns_scope_check_conflicts(t->scope, p); |
| 490 | |
| 491 | t->block_gc++; |
| 492 | dns_transaction_process_reply(t, p); |
| 493 | t->block_gc--; |
| 494 | |
| 495 | /* If the response wasn't useful, then complete the transition |
| 496 | * now. After all, we are the worst feature set now with TCP |
| 497 | * sockets, and there's really no point in retrying. */ |
| 498 | if (t->state == DNS_TRANSACTION_PENDING) |
| 499 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 500 | else |
| 501 | dns_transaction_gc(t); |
| 502 | |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | static int on_stream_connection(DnsStream *s) { |
| 507 | #if ENABLE_DNS_OVER_TLS1 |
| 508 | /* Store TLS Ticket for faster succesive TLS handshakes */ |
| 509 | if (s->tls_session && s->server) { |
| 510 | if (s->server->tls_session_data.data) |
| 511 | gnutls_free(s->server->tls_session_data.data); |
| 512 | |
| 513 | gnutls_session_get_data2(s->tls_session, &s->server->tls_session_data); |
| 514 | } |
| 515 | #endif |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | static int on_stream_complete(DnsStream *s, int error) { |
| 521 | DnsTransaction *t, *n; |
| 522 | int r = 0; |
| 523 | |
| 524 | /* Do not let new transactions use this stream */ |
| 525 | if (s->server && s->server->stream == s) |
| 526 | s->server->stream = dns_stream_unref(s->server->stream); |
| 527 | |
| 528 | if (ERRNO_IS_DISCONNECT(error)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){107, 104, 111, 103, 32, 101})/sizeof(int )]; switch(error) { case 107: case 104: case 111: case 103: case 32: case 101: _found = 1; break; default: break; } _found; } ) && s->protocol != DNS_PROTOCOL_LLMNR) { |
| 529 | usec_t usec; |
| 530 | |
| 531 | log_debug_errno(error, "Connection failure for DNS TCP stream: %m")({ int _level = ((7)), _e = ((error)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 531, __func__, "Connection failure for DNS TCP stream: %m") : -abs(_e); }); |
| 532 | |
| 533 | if (s->transactions) { |
| 534 | t = s->transactions; |
| 535 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &usec) >= 0)do { if ((__builtin_expect(!!(!(sd_event_now(t->scope-> manager->event, clock_boottime_or_monotonic(), &usec) >= 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &usec) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 535, __PRETTY_FUNCTION__ ); } while (0); |
| 536 | dns_server_packet_lost(t->server, IPPROTO_TCPIPPROTO_TCP, t->current_feature_level); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | LIST_FOREACH_SAFE(transactions_by_stream, t, n, s->transactions)for ((t) = (s->transactions); (t) && (((n) = (t)-> transactions_by_stream_next), 1); (t) = (n)) |
| 541 | if (error != 0) |
| 542 | on_transaction_stream_error(t, error); |
| 543 | else if (DNS_PACKET_ID(s->read_packet)((DnsPacketHeader*) DNS_PACKET_DATA(s->read_packet))->id == t->id) |
| 544 | /* As each transaction have a unique id the return code is only set once */ |
| 545 | r = dns_transaction_on_stream_packet(t, s->read_packet); |
| 546 | |
| 547 | return r; |
| 548 | } |
| 549 | |
| 550 | static int dns_stream_on_packet(DnsStream *s) { |
| 551 | _cleanup_(dns_packet_unrefp)__attribute__((cleanup(dns_packet_unrefp))) DnsPacket *p = NULL((void*)0); |
| 552 | int r = 0; |
| 553 | DnsTransaction *t; |
| 554 | |
| 555 | /* Take ownership of packet to be able to receive new packets */ |
| 556 | p = TAKE_PTR(s->read_packet)({ typeof(s->read_packet) _ptr_ = (s->read_packet); (s-> read_packet) = ((void*)0); _ptr_; }); |
| 557 | s->n_read = 0; |
| 558 | |
| 559 | t = hashmap_get(s->manager->dns_transactions, UINT_TO_PTR(DNS_PACKET_ID(p))((void *) ((uintptr_t) (((DnsPacketHeader*) DNS_PACKET_DATA(p ))->id)))); |
| 560 | |
| 561 | /* Ignore incorrect transaction id as transaction can have been canceled */ |
| 562 | if (t) |
| 563 | r = dns_transaction_on_stream_packet(t, p); |
| 564 | else { |
| 565 | if (dns_packet_validate_reply(p) <= 0) { |
| 566 | log_debug("Invalid TCP reply packet.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 566, __func__, "Invalid TCP reply packet.") : -abs(_e); }); |
| 567 | on_stream_complete(s, 0); |
| 568 | } |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | return r; |
| 573 | } |
| 574 | |
| 575 | static int dns_transaction_emit_tcp(DnsTransaction *t) { |
| 576 | _cleanup_close___attribute__((cleanup(closep))) int fd = -1; |
| 577 | _cleanup_(dns_stream_unrefp)__attribute__((cleanup(dns_stream_unrefp))) DnsStream *s = NULL((void*)0); |
| 578 | union sockaddr_union sa; |
| 579 | int r; |
| 580 | #if ENABLE_DNS_OVER_TLS1 |
| 581 | gnutls_session_t gs; |
| 582 | #endif |
| 583 | |
| 584 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 584, __PRETTY_FUNCTION__); } while (0); |
| 585 | |
| 586 | dns_transaction_close_connection(t); |
| 587 | |
| 588 | switch (t->scope->protocol) { |
| 589 | |
| 590 | case DNS_PROTOCOL_DNS: |
| 591 | r = dns_transaction_pick_server(t); |
| 592 | if (r < 0) |
| 593 | return r; |
| 594 | |
| 595 | if (!dns_server_dnssec_supported(t->server) && dns_type_is_dnssec(t->key->type)) |
| 596 | return -EOPNOTSUPP95; |
| 597 | |
| 598 | r = dns_server_adjust_opt(t->server, t->sent, t->current_feature_level); |
| 599 | if (r < 0) |
| 600 | return r; |
| 601 | |
| 602 | if (t->server->stream && (DNS_SERVER_FEATURE_LEVEL_IS_TLS(t->current_feature_level)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO })/sizeof(int)]; switch(t->current_feature_level) { case DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN : case DNS_SERVER_FEATURE_LEVEL_TLS_DO: _found = 1; break; default : break; } _found; }) == t->server->stream->encrypted)) |
| 603 | s = dns_stream_ref(t->server->stream); |
| 604 | else |
| 605 | fd = dns_scope_socket_tcp(t->scope, AF_UNSPEC0, NULL((void*)0), t->server, DNS_SERVER_FEATURE_LEVEL_IS_TLS(t->current_feature_level)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO })/sizeof(int)]; switch(t->current_feature_level) { case DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN : case DNS_SERVER_FEATURE_LEVEL_TLS_DO: _found = 1; break; default : break; } _found; }) ? 853 : 53, &sa); |
| 606 | |
| 607 | break; |
| 608 | |
| 609 | case DNS_PROTOCOL_LLMNR: |
| 610 | /* When we already received a reply to this (but it was truncated), send to its sender address */ |
| 611 | if (t->received) |
| 612 | fd = dns_scope_socket_tcp(t->scope, t->received->family, &t->received->sender, NULL((void*)0), t->received->sender_port, &sa); |
| 613 | else { |
| 614 | union in_addr_union address; |
| 615 | int family = AF_UNSPEC0; |
| 616 | |
| 617 | /* Otherwise, try to talk to the owner of a |
| 618 | * the IP address, in case this is a reverse |
| 619 | * PTR lookup */ |
| 620 | |
| 621 | r = dns_name_address(dns_resource_key_name(t->key), &family, &address); |
| 622 | if (r < 0) |
| 623 | return r; |
| 624 | if (r == 0) |
| 625 | return -EINVAL22; |
| 626 | if (family != t->scope->family) |
| 627 | return -ESRCH3; |
| 628 | |
| 629 | fd = dns_scope_socket_tcp(t->scope, family, &address, NULL((void*)0), LLMNR_PORT5355, &sa); |
| 630 | } |
| 631 | |
| 632 | break; |
| 633 | |
| 634 | default: |
| 635 | return -EAFNOSUPPORT97; |
| 636 | } |
| 637 | |
| 638 | if (!s) { |
| 639 | if (fd < 0) |
| 640 | return fd; |
| 641 | |
| 642 | r = dns_stream_new(t->scope->manager, &s, t->scope->protocol, fd, &sa); |
| 643 | if (r < 0) |
| 644 | return r; |
| 645 | |
| 646 | fd = -1; |
Value stored to 'fd' is never read | |
| 647 | |
| 648 | if (t->server) { |
| 649 | dns_stream_unref(t->server->stream); |
| 650 | t->server->stream = dns_stream_ref(s); |
| 651 | s->server = dns_server_ref(t->server); |
| 652 | } |
| 653 | |
| 654 | #if ENABLE_DNS_OVER_TLS1 |
| 655 | if (DNS_SERVER_FEATURE_LEVEL_IS_TLS(t->current_feature_level)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO })/sizeof(int)]; switch(t->current_feature_level) { case DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN : case DNS_SERVER_FEATURE_LEVEL_TLS_DO: _found = 1; break; default : break; } _found; })) { |
| 656 | r = gnutls_init(&gs, GNUTLS_CLIENT(1<<1) | GNUTLS_ENABLE_FALSE_START(1<<8) | GNUTLS_NONBLOCK(1<<3)); |
| 657 | if (r < 0) |
| 658 | return r; |
| 659 | |
| 660 | /* As DNS-over-TLS is a recent protocol, older TLS versions can be disabled */ |
| 661 | r = gnutls_priority_set_direct(gs, "NORMAL:-VERS-ALL:+VERS-TLS1.2", NULL((void*)0)); |
| 662 | if (r < 0) |
| 663 | return r; |
| 664 | |
| 665 | r = gnutls_credentials_set(gs, GNUTLS_CRD_CERTIFICATE, t->server->tls_cert_cred); |
| 666 | if (r < 0) |
| 667 | return r; |
| 668 | |
| 669 | if (t->server && t->server->tls_session_data.size > 0) |
| 670 | gnutls_session_set_data(gs, t->server->tls_session_data.data, t->server->tls_session_data.size); |
| 671 | |
| 672 | gnutls_handshake_set_timeout(gs, GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT((unsigned int)-1)); |
| 673 | |
| 674 | r = dns_stream_connect_tls(s, gs); |
| 675 | if (r < 0) |
| 676 | return r; |
| 677 | } |
| 678 | #endif |
| 679 | |
| 680 | s->on_connection = on_stream_connection; |
| 681 | s->complete = on_stream_complete; |
| 682 | s->on_packet = dns_stream_on_packet; |
| 683 | |
| 684 | /* The interface index is difficult to determine if we are |
| 685 | * connecting to the local host, hence fill this in right away |
| 686 | * instead of determining it from the socket */ |
| 687 | s->ifindex = dns_scope_ifindex(t->scope); |
| 688 | } |
| 689 | |
| 690 | t->stream = TAKE_PTR(s)({ typeof(s) _ptr_ = (s); (s) = ((void*)0); _ptr_; }); |
| 691 | LIST_PREPEND(transactions_by_stream, t->stream->transactions, t)do { typeof(*(t->stream->transactions)) **_head = & (t->stream->transactions), *_item = (t); do { if ((__builtin_expect (!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-transaction.c", 691, __PRETTY_FUNCTION__); } while (0); if ((_item->transactions_by_stream_next = *_head)) _item->transactions_by_stream_next->transactions_by_stream_prev = _item; _item->transactions_by_stream_prev = ((void*)0); *_head = _item; } while (0); |
| 692 | |
| 693 | r = dns_stream_write_packet(t->stream, t->sent); |
| 694 | if (r < 0) { |
| 695 | dns_transaction_close_connection(t); |
| 696 | return r; |
| 697 | } |
| 698 | |
| 699 | dns_transaction_reset_answer(t); |
| 700 | |
| 701 | t->tried_stream = true1; |
| 702 | |
| 703 | return 0; |
| 704 | } |
| 705 | |
| 706 | static void dns_transaction_cache_answer(DnsTransaction *t) { |
| 707 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 707, __PRETTY_FUNCTION__); } while (0); |
| 708 | |
| 709 | /* For mDNS we cache whenever we get the packet, rather than |
| 710 | * in each transaction. */ |
| 711 | if (!IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR})/sizeof (int)]; switch(t->scope->protocol) { case DNS_PROTOCOL_DNS : case DNS_PROTOCOL_LLMNR: _found = 1; break; default: break; } _found; })) |
| 712 | return; |
| 713 | |
| 714 | /* Caching disabled? */ |
| 715 | if (!t->scope->manager->enable_cache) |
| 716 | return; |
| 717 | |
| 718 | /* We never cache if this packet is from the local host, under |
| 719 | * the assumption that a locally running DNS server would |
| 720 | * cache this anyway, and probably knows better when to flush |
| 721 | * the cache then we could. */ |
| 722 | if (!DNS_PACKET_SHALL_CACHE(t->received)) |
| 723 | return; |
| 724 | |
| 725 | dns_cache_put(&t->scope->cache, |
| 726 | t->key, |
| 727 | t->answer_rcode, |
| 728 | t->answer, |
| 729 | t->answer_authenticated, |
| 730 | t->answer_nsec_ttl, |
| 731 | 0, |
| 732 | t->received->family, |
| 733 | &t->received->sender); |
| 734 | } |
| 735 | |
| 736 | static bool_Bool dns_transaction_dnssec_is_live(DnsTransaction *t) { |
| 737 | DnsTransaction *dt; |
| 738 | Iterator i; |
| 739 | |
| 740 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 740, __PRETTY_FUNCTION__); } while (0); |
| 741 | |
| 742 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) |
| 743 | if (DNS_TRANSACTION_IS_LIVE(dt->state)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING , DNS_TRANSACTION_VALIDATING})/sizeof(int)]; switch((dt->state )) { case DNS_TRANSACTION_NULL: case DNS_TRANSACTION_PENDING: case DNS_TRANSACTION_VALIDATING: _found = 1; break; default: break; } _found; })) |
| 744 | return true1; |
| 745 | |
| 746 | return false0; |
| 747 | } |
| 748 | |
| 749 | static int dns_transaction_dnssec_ready(DnsTransaction *t) { |
| 750 | DnsTransaction *dt; |
| 751 | Iterator i; |
| 752 | |
| 753 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 753, __PRETTY_FUNCTION__); } while (0); |
| 754 | |
| 755 | /* Checks whether the auxiliary DNSSEC transactions of our transaction have completed, or are still |
| 756 | * ongoing. Returns 0, if we aren't ready for the DNSSEC validation, positive if we are. */ |
| 757 | |
| 758 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 759 | |
| 760 | switch (dt->state) { |
| 761 | |
| 762 | case DNS_TRANSACTION_NULL: |
| 763 | case DNS_TRANSACTION_PENDING: |
| 764 | case DNS_TRANSACTION_VALIDATING: |
| 765 | /* Still ongoing */ |
| 766 | return 0; |
| 767 | |
| 768 | case DNS_TRANSACTION_RCODE_FAILURE: |
| 769 | if (!IN_SET(dt->answer_rcode, DNS_RCODE_NXDOMAIN, DNS_RCODE_SERVFAIL)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_RCODE_NXDOMAIN, DNS_RCODE_SERVFAIL}) /sizeof(int)]; switch(dt->answer_rcode) { case DNS_RCODE_NXDOMAIN : case DNS_RCODE_SERVFAIL: _found = 1; break; default: break; } _found; })) { |
| 770 | log_debug("Auxiliary DNSSEC RR query failed with rcode=%s.", dns_rcode_to_string(dt->answer_rcode))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 770, __func__, "Auxiliary DNSSEC RR query failed with rcode=%s.", dns_rcode_to_string (dt->answer_rcode)) : -abs(_e); }); |
| 771 | goto fail; |
| 772 | } |
| 773 | |
| 774 | /* Fall-through: NXDOMAIN/SERVFAIL is good enough for us. This is because some DNS servers |
| 775 | * erronously return NXDOMAIN/SERVFAIL for empty non-terminals (Akamai...) or missing DS |
| 776 | * records (Facebook), and we need to handle that nicely, when asking for parent SOA or similar |
| 777 | * RRs to make unsigned proofs. */ |
| 778 | |
| 779 | case DNS_TRANSACTION_SUCCESS: |
| 780 | /* All good. */ |
| 781 | break; |
| 782 | |
| 783 | case DNS_TRANSACTION_DNSSEC_FAILED: |
| 784 | /* We handle DNSSEC failures different from other errors, as we care about the DNSSEC |
| 785 | * validationr result */ |
| 786 | |
| 787 | log_debug("Auxiliary DNSSEC RR query failed validation: %s", dnssec_result_to_string(dt->answer_dnssec_result))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 787, __func__, "Auxiliary DNSSEC RR query failed validation: %s", dnssec_result_to_string (dt->answer_dnssec_result)) : -abs(_e); }); |
| 788 | t->answer_dnssec_result = dt->answer_dnssec_result; /* Copy error code over */ |
| 789 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); |
| 790 | return 0; |
| 791 | |
| 792 | default: |
| 793 | log_debug("Auxiliary DNSSEC RR query failed with %s", dns_transaction_state_to_string(dt->state))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 793, __func__, "Auxiliary DNSSEC RR query failed with %s", dns_transaction_state_to_string (dt->state)) : -abs(_e); }); |
| 794 | goto fail; |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | /* All is ready, we can go and validate */ |
| 799 | return 1; |
| 800 | |
| 801 | fail: |
| 802 | t->answer_dnssec_result = DNSSEC_FAILED_AUXILIARY; |
| 803 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | static void dns_transaction_process_dnssec(DnsTransaction *t) { |
| 808 | int r; |
| 809 | |
| 810 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 810, __PRETTY_FUNCTION__); } while (0); |
| 811 | |
| 812 | /* Are there ongoing DNSSEC transactions? If so, let's wait for them. */ |
| 813 | r = dns_transaction_dnssec_ready(t); |
| 814 | if (r < 0) |
| 815 | goto fail; |
| 816 | if (r == 0) /* We aren't ready yet (or one of our auxiliary transactions failed, and we shouldn't validate now */ |
| 817 | return; |
| 818 | |
| 819 | /* See if we learnt things from the additional DNSSEC transactions, that we didn't know before, and better |
| 820 | * restart the lookup immediately. */ |
| 821 | r = dns_transaction_maybe_restart(t); |
| 822 | if (r < 0) |
| 823 | goto fail; |
| 824 | if (r > 0) /* Transaction got restarted... */ |
| 825 | return; |
| 826 | |
| 827 | /* All our auxiliary DNSSEC transactions are complete now. Try |
| 828 | * to validate our RRset now. */ |
| 829 | r = dns_transaction_validate_dnssec(t); |
| 830 | if (r == -EBADMSG74) { |
| 831 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 832 | return; |
| 833 | } |
| 834 | if (r < 0) |
| 835 | goto fail; |
| 836 | |
| 837 | if (t->answer_dnssec_result == DNSSEC_INCOMPATIBLE_SERVER && |
| 838 | t->scope->dnssec_mode == DNSSEC_YES) { |
| 839 | |
| 840 | /* We are not in automatic downgrade mode, and the server is bad. Let's try a different server, maybe |
| 841 | * that works. */ |
| 842 | |
| 843 | if (t->n_picked_servers < dns_scope_get_n_dns_servers(t->scope)) { |
| 844 | /* We tried fewer servers on this transaction than we know, let's try another one then */ |
| 845 | dns_transaction_retry(t, true1); |
| 846 | return; |
| 847 | } |
| 848 | |
| 849 | /* OK, let's give up, apparently all servers we tried didn't work. */ |
| 850 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); |
| 851 | return; |
| 852 | } |
| 853 | |
| 854 | if (!IN_SET(t->answer_dnssec_result,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){_DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED , DNSSEC_UNSIGNED, DNSSEC_INCOMPATIBLE_SERVER})/sizeof(int)]; switch(t->answer_dnssec_result) { case _DNSSEC_RESULT_INVALID : case DNSSEC_VALIDATED: case DNSSEC_UNSIGNED: case DNSSEC_INCOMPATIBLE_SERVER : _found = 1; break; default: break; } _found; }) |
| 855 | _DNSSEC_RESULT_INVALID, /* No DNSSEC validation enabled */({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){_DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED , DNSSEC_UNSIGNED, DNSSEC_INCOMPATIBLE_SERVER})/sizeof(int)]; switch(t->answer_dnssec_result) { case _DNSSEC_RESULT_INVALID : case DNSSEC_VALIDATED: case DNSSEC_UNSIGNED: case DNSSEC_INCOMPATIBLE_SERVER : _found = 1; break; default: break; } _found; }) |
| 856 | DNSSEC_VALIDATED, /* Answer is signed and validated successfully */({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){_DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED , DNSSEC_UNSIGNED, DNSSEC_INCOMPATIBLE_SERVER})/sizeof(int)]; switch(t->answer_dnssec_result) { case _DNSSEC_RESULT_INVALID : case DNSSEC_VALIDATED: case DNSSEC_UNSIGNED: case DNSSEC_INCOMPATIBLE_SERVER : _found = 1; break; default: break; } _found; }) |
| 857 | DNSSEC_UNSIGNED, /* Answer is right-fully unsigned */({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){_DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED , DNSSEC_UNSIGNED, DNSSEC_INCOMPATIBLE_SERVER})/sizeof(int)]; switch(t->answer_dnssec_result) { case _DNSSEC_RESULT_INVALID : case DNSSEC_VALIDATED: case DNSSEC_UNSIGNED: case DNSSEC_INCOMPATIBLE_SERVER : _found = 1; break; default: break; } _found; }) |
| 858 | DNSSEC_INCOMPATIBLE_SERVER)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){_DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED , DNSSEC_UNSIGNED, DNSSEC_INCOMPATIBLE_SERVER})/sizeof(int)]; switch(t->answer_dnssec_result) { case _DNSSEC_RESULT_INVALID : case DNSSEC_VALIDATED: case DNSSEC_UNSIGNED: case DNSSEC_INCOMPATIBLE_SERVER : _found = 1; break; default: break; } _found; })) { /* Server does not do DNSSEC (Yay, we are downgrade attack vulnerable!) */ |
| 859 | dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); |
| 860 | return; |
| 861 | } |
| 862 | |
| 863 | if (t->answer_dnssec_result == DNSSEC_INCOMPATIBLE_SERVER) |
| 864 | dns_server_warn_downgrade(t->server); |
| 865 | |
| 866 | dns_transaction_cache_answer(t); |
| 867 | |
| 868 | if (t->answer_rcode == DNS_RCODE_SUCCESS) |
| 869 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
| 870 | else |
| 871 | dns_transaction_complete(t, DNS_TRANSACTION_RCODE_FAILURE); |
| 872 | |
| 873 | return; |
| 874 | |
| 875 | fail: |
| 876 | t->answer_errno = -r; |
| 877 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); |
| 878 | } |
| 879 | |
| 880 | static int dns_transaction_has_positive_answer(DnsTransaction *t, DnsAnswerFlags *flags) { |
| 881 | int r; |
| 882 | |
| 883 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 883, __PRETTY_FUNCTION__); } while (0); |
| 884 | |
| 885 | /* Checks whether the answer is positive, i.e. either a direct |
| 886 | * answer to the question, or a CNAME/DNAME for it */ |
| 887 | |
| 888 | r = dns_answer_match_key(t->answer, t->key, flags); |
| 889 | if (r != 0) |
| 890 | return r; |
| 891 | |
| 892 | r = dns_answer_find_cname_or_dname(t->answer, t->key, NULL((void*)0), flags); |
| 893 | if (r != 0) |
| 894 | return r; |
| 895 | |
| 896 | return false0; |
| 897 | } |
| 898 | |
| 899 | static int dns_transaction_fix_rcode(DnsTransaction *t) { |
| 900 | int r; |
| 901 | |
| 902 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 902, __PRETTY_FUNCTION__); } while (0); |
| 903 | |
| 904 | /* Fix up the RCODE to SUCCESS if we get at least one matching RR in a response. Note that this contradicts the |
| 905 | * DNS RFCs a bit. Specifically, RFC 6604 Section 3 clarifies that the RCODE shall say something about a |
| 906 | * CNAME/DNAME chain element coming after the last chain element contained in the message, and not the first |
| 907 | * one included. However, it also indicates that not all DNS servers implement this correctly. Moreover, when |
| 908 | * using DNSSEC we usually only can prove the first element of a CNAME/DNAME chain anyway, hence let's settle |
| 909 | * on always processing the RCODE as referring to the immediate look-up we do, i.e. the first element of a |
| 910 | * CNAME/DNAME chain. This way, we uniformly handle CNAME/DNAME chains, regardless if the DNS server |
| 911 | * incorrectly implements RCODE, whether DNSSEC is in use, or whether the DNS server only supplied us with an |
| 912 | * incomplete CNAME/DNAME chain. |
| 913 | * |
| 914 | * Or in other words: if we get at least one positive reply in a message we patch NXDOMAIN to become SUCCESS, |
| 915 | * and then rely on the CNAME chasing logic to figure out that there's actually a CNAME error with a new |
| 916 | * lookup. */ |
| 917 | |
| 918 | if (t->answer_rcode != DNS_RCODE_NXDOMAIN) |
| 919 | return 0; |
| 920 | |
| 921 | r = dns_transaction_has_positive_answer(t, NULL((void*)0)); |
| 922 | if (r <= 0) |
| 923 | return r; |
| 924 | |
| 925 | t->answer_rcode = DNS_RCODE_SUCCESS; |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { |
| 930 | usec_t ts; |
| 931 | int r; |
| 932 | |
| 933 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 933, __PRETTY_FUNCTION__); } while (0); |
| 934 | assert(p)do { if ((__builtin_expect(!!(!(p)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("p"), "../src/resolve/resolved-dns-transaction.c" , 934, __PRETTY_FUNCTION__); } while (0); |
| 935 | assert(t->scope)do { if ((__builtin_expect(!!(!(t->scope)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t->scope"), "../src/resolve/resolved-dns-transaction.c" , 935, __PRETTY_FUNCTION__); } while (0); |
| 936 | assert(t->scope->manager)do { if ((__builtin_expect(!!(!(t->scope->manager)),0)) ) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("t->scope->manager" ), "../src/resolve/resolved-dns-transaction.c", 936, __PRETTY_FUNCTION__ ); } while (0); |
| 937 | |
| 938 | if (t->state != DNS_TRANSACTION_PENDING) |
| 939 | return; |
| 940 | |
| 941 | /* Note that this call might invalidate the query. Callers |
| 942 | * should hence not attempt to access the query or transaction |
| 943 | * after calling this function. */ |
| 944 | |
| 945 | log_debug("Processing incoming packet on transaction %" PRIu16" (rcode=%s).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 946, __func__, "Processing incoming packet on transaction %" "u"" (rcode=%s)." , t->id, dns_rcode_to_string(DNS_PACKET_RCODE(p))) : -abs( _e); }) |
| 946 | t->id, dns_rcode_to_string(DNS_PACKET_RCODE(p)))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 946, __func__, "Processing incoming packet on transaction %" "u"" (rcode=%s)." , t->id, dns_rcode_to_string(DNS_PACKET_RCODE(p))) : -abs( _e); }); |
| 947 | |
| 948 | switch (t->scope->protocol) { |
| 949 | |
| 950 | case DNS_PROTOCOL_LLMNR: |
| 951 | /* For LLMNR we will not accept any packets from other interfaces */ |
| 952 | |
| 953 | if (p->ifindex != dns_scope_ifindex(t->scope)) |
| 954 | return; |
| 955 | |
| 956 | if (p->family != t->scope->family) |
| 957 | return; |
| 958 | |
| 959 | /* Tentative packets are not full responses but still |
| 960 | * useful for identifying uniqueness conflicts during |
| 961 | * probing. */ |
| 962 | if (DNS_PACKET_LLMNR_T(p)((be16toh(((DnsPacketHeader*) DNS_PACKET_DATA(p))->flags) >> 8) & 1)) { |
| 963 | dns_transaction_tentative(t, p); |
| 964 | return; |
| 965 | } |
| 966 | |
| 967 | break; |
| 968 | |
| 969 | case DNS_PROTOCOL_MDNS: |
| 970 | /* For mDNS we will not accept any packets from other interfaces */ |
| 971 | |
| 972 | if (p->ifindex != dns_scope_ifindex(t->scope)) |
| 973 | return; |
| 974 | |
| 975 | if (p->family != t->scope->family) |
| 976 | return; |
| 977 | |
| 978 | break; |
| 979 | |
| 980 | case DNS_PROTOCOL_DNS: |
| 981 | /* Note that we do not need to verify the |
| 982 | * addresses/port numbers of incoming traffic, as we |
| 983 | * invoked connect() on our UDP socket in which case |
| 984 | * the kernel already does the needed verification for |
| 985 | * us. */ |
| 986 | break; |
| 987 | |
| 988 | default: |
| 989 | assert_not_reached("Invalid DNS protocol.")do { log_assert_failed_unreachable_realm(LOG_REALM_SYSTEMD, ( "Invalid DNS protocol."), "../src/resolve/resolved-dns-transaction.c" , 989, __PRETTY_FUNCTION__); } while (0); |
| 990 | } |
| 991 | |
| 992 | if (t->received != p) { |
| 993 | dns_packet_unref(t->received); |
| 994 | t->received = dns_packet_ref(p); |
| 995 | } |
| 996 | |
| 997 | t->answer_source = DNS_TRANSACTION_NETWORK; |
| 998 | |
| 999 | if (p->ipproto == IPPROTO_TCPIPPROTO_TCP) { |
| 1000 | if (DNS_PACKET_TC(p)((be16toh(((DnsPacketHeader*) DNS_PACKET_DATA(p))->flags) >> 9) & 1)) { |
| 1001 | /* Truncated via TCP? Somebody must be fucking with us */ |
| 1002 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 1003 | return; |
| 1004 | } |
| 1005 | |
| 1006 | if (DNS_PACKET_ID(p)((DnsPacketHeader*) DNS_PACKET_DATA(p))->id != t->id) { |
| 1007 | /* Not the reply to our query? Somebody must be fucking with us */ |
| 1008 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 1009 | return; |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0)do { if ((__builtin_expect(!!(!(sd_event_now(t->scope-> manager->event, clock_boottime_or_monotonic(), &ts) >= 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 1013, __PRETTY_FUNCTION__ ); } while (0); |
| 1014 | |
| 1015 | switch (t->scope->protocol) { |
| 1016 | |
| 1017 | case DNS_PROTOCOL_DNS: |
| 1018 | assert(t->server)do { if ((__builtin_expect(!!(!(t->server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t->server"), "../src/resolve/resolved-dns-transaction.c" , 1018, __PRETTY_FUNCTION__); } while (0); |
| 1019 | |
| 1020 | if (IN_SET(DNS_PACKET_RCODE(p), DNS_RCODE_FORMERR, DNS_RCODE_SERVFAIL, DNS_RCODE_NOTIMP)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_RCODE_FORMERR, DNS_RCODE_SERVFAIL, DNS_RCODE_NOTIMP })/sizeof(int)]; switch(DNS_PACKET_RCODE(p)) { case DNS_RCODE_FORMERR : case DNS_RCODE_SERVFAIL: case DNS_RCODE_NOTIMP: _found = 1; break; default: break; } _found; })) { |
| 1021 | |
| 1022 | /* Request failed, immediately try again with reduced features */ |
| 1023 | |
| 1024 | if (t->current_feature_level <= DNS_SERVER_FEATURE_LEVEL_UDP) { |
| 1025 | |
| 1026 | /* This was already at UDP feature level? If so, it doesn't make sense to downgrade |
| 1027 | * this transaction anymore, but let's see if it might make sense to send the request |
| 1028 | * to a different DNS server instead. If not let's process the response, and accept the |
| 1029 | * rcode. Note that we don't retry on TCP, since that's a suitable way to mitigate |
| 1030 | * packet loss, but is not going to give us better rcodes should we actually have |
| 1031 | * managed to get them already at UDP level. */ |
| 1032 | |
| 1033 | if (t->n_picked_servers < dns_scope_get_n_dns_servers(t->scope)) { |
| 1034 | /* We tried fewer servers on this transaction than we know, let's try another one then */ |
| 1035 | dns_transaction_retry(t, true1); |
| 1036 | return; |
| 1037 | } |
| 1038 | |
| 1039 | /* Give up, accept the rcode */ |
| 1040 | log_debug("Server returned error: %s", dns_rcode_to_string(DNS_PACKET_RCODE(p)))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1040, __func__ , "Server returned error: %s", dns_rcode_to_string(DNS_PACKET_RCODE (p))) : -abs(_e); }); |
| 1041 | break; |
| 1042 | } |
| 1043 | |
| 1044 | /* Reduce this feature level by one and try again. */ |
| 1045 | switch (t->current_feature_level) { |
| 1046 | case DNS_SERVER_FEATURE_LEVEL_TLS_DO: |
| 1047 | t->clamp_feature_level = DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN; |
| 1048 | break; |
| 1049 | case DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN + 1: |
| 1050 | /* Skip plain TLS when TLS is not supported */ |
| 1051 | t->clamp_feature_level = DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN - 1; |
| 1052 | break; |
| 1053 | default: |
| 1054 | t->clamp_feature_level = t->current_feature_level - 1; |
| 1055 | } |
| 1056 | |
| 1057 | log_debug("Server returned error %s, retrying transaction with reduced feature level %s.",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1059, __func__ , "Server returned error %s, retrying transaction with reduced feature level %s." , dns_rcode_to_string(DNS_PACKET_RCODE(p)), dns_server_feature_level_to_string (t->clamp_feature_level)) : -abs(_e); }) |
| 1058 | dns_rcode_to_string(DNS_PACKET_RCODE(p)),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1059, __func__ , "Server returned error %s, retrying transaction with reduced feature level %s." , dns_rcode_to_string(DNS_PACKET_RCODE(p)), dns_server_feature_level_to_string (t->clamp_feature_level)) : -abs(_e); }) |
| 1059 | dns_server_feature_level_to_string(t->clamp_feature_level))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1059, __func__ , "Server returned error %s, retrying transaction with reduced feature level %s." , dns_rcode_to_string(DNS_PACKET_RCODE(p)), dns_server_feature_level_to_string (t->clamp_feature_level)) : -abs(_e); }); |
| 1060 | |
| 1061 | dns_transaction_retry(t, false0 /* use the same server */); |
| 1062 | return; |
| 1063 | } |
| 1064 | |
| 1065 | if (DNS_PACKET_RCODE(p) == DNS_RCODE_REFUSED) { |
| 1066 | /* This server refused our request? If so, try again, use a different server */ |
| 1067 | log_debug("Server returned REFUSED, switching servers, and retrying.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1067, __func__ , "Server returned REFUSED, switching servers, and retrying." ) : -abs(_e); }); |
| 1068 | dns_transaction_retry(t, true1 /* pick a new server */); |
| 1069 | return; |
| 1070 | } |
| 1071 | |
| 1072 | if (DNS_PACKET_TC(p)((be16toh(((DnsPacketHeader*) DNS_PACKET_DATA(p))->flags) >> 9) & 1)) |
| 1073 | dns_server_packet_truncated(t->server, t->current_feature_level); |
| 1074 | |
| 1075 | break; |
| 1076 | |
| 1077 | case DNS_PROTOCOL_LLMNR: |
| 1078 | case DNS_PROTOCOL_MDNS: |
| 1079 | dns_scope_packet_received(t->scope, ts - t->start_usec); |
| 1080 | break; |
| 1081 | |
| 1082 | default: |
| 1083 | assert_not_reached("Invalid DNS protocol.")do { log_assert_failed_unreachable_realm(LOG_REALM_SYSTEMD, ( "Invalid DNS protocol."), "../src/resolve/resolved-dns-transaction.c" , 1083, __PRETTY_FUNCTION__); } while (0); |
| 1084 | } |
| 1085 | |
| 1086 | if (DNS_PACKET_TC(p)((be16toh(((DnsPacketHeader*) DNS_PACKET_DATA(p))->flags) >> 9) & 1)) { |
| 1087 | |
| 1088 | /* Truncated packets for mDNS are not allowed. Give up immediately. */ |
| 1089 | if (t->scope->protocol == DNS_PROTOCOL_MDNS) { |
| 1090 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 1091 | return; |
| 1092 | } |
| 1093 | |
| 1094 | log_debug("Reply truncated, retrying via TCP.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1094, __func__ , "Reply truncated, retrying via TCP.") : -abs(_e); }); |
| 1095 | |
| 1096 | /* Response was truncated, let's try again with good old TCP */ |
| 1097 | r = dns_transaction_emit_tcp(t); |
| 1098 | if (r == -ESRCH3) { |
| 1099 | /* No servers found? Damn! */ |
| 1100 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); |
| 1101 | return; |
| 1102 | } |
| 1103 | if (r == -EOPNOTSUPP95) { |
| 1104 | /* Tried to ask for DNSSEC RRs, on a server that doesn't do DNSSEC */ |
| 1105 | dns_transaction_complete(t, DNS_TRANSACTION_RR_TYPE_UNSUPPORTED); |
| 1106 | return; |
| 1107 | } |
| 1108 | if (r < 0) { |
| 1109 | /* On LLMNR, if we cannot connect to the host, |
| 1110 | * we immediately give up */ |
| 1111 | if (t->scope->protocol != DNS_PROTOCOL_DNS) |
| 1112 | goto fail; |
| 1113 | |
| 1114 | /* On DNS, couldn't send? Try immediately again, with a new server */ |
| 1115 | dns_transaction_retry(t, true1); |
| 1116 | } |
| 1117 | |
| 1118 | return; |
| 1119 | } |
| 1120 | |
| 1121 | /* After the superficial checks, actually parse the message. */ |
| 1122 | r = dns_packet_extract(p); |
| 1123 | if (r < 0) { |
| 1124 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 1125 | return; |
| 1126 | } |
| 1127 | |
| 1128 | if (t->server) { |
| 1129 | /* Report that we successfully received a valid packet with a good rcode after we initially got a bad |
| 1130 | * rcode and subsequently downgraded the protocol */ |
| 1131 | |
| 1132 | if (IN_SET(DNS_PACKET_RCODE(p), DNS_RCODE_SUCCESS, DNS_RCODE_NXDOMAIN)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_RCODE_SUCCESS, DNS_RCODE_NXDOMAIN})/ sizeof(int)]; switch(DNS_PACKET_RCODE(p)) { case DNS_RCODE_SUCCESS : case DNS_RCODE_NXDOMAIN: _found = 1; break; default: break; } _found; }) && |
| 1133 | t->clamp_feature_level != _DNS_SERVER_FEATURE_LEVEL_INVALID) |
| 1134 | dns_server_packet_rcode_downgrade(t->server, t->clamp_feature_level); |
| 1135 | |
| 1136 | /* Report that the OPT RR was missing */ |
| 1137 | if (!p->opt) |
| 1138 | dns_server_packet_bad_opt(t->server, t->current_feature_level); |
| 1139 | |
| 1140 | /* Report that we successfully received a packet */ |
| 1141 | dns_server_packet_received(t->server, p->ipproto, t->current_feature_level, p->size); |
| 1142 | } |
| 1143 | |
| 1144 | /* See if we know things we didn't know before that indicate we better restart the lookup immediately. */ |
| 1145 | r = dns_transaction_maybe_restart(t); |
| 1146 | if (r < 0) |
| 1147 | goto fail; |
| 1148 | if (r > 0) /* Transaction got restarted... */ |
| 1149 | return; |
| 1150 | |
| 1151 | if (IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR, DNS_PROTOCOL_MDNS)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR, DNS_PROTOCOL_MDNS })/sizeof(int)]; switch(t->scope->protocol) { case DNS_PROTOCOL_DNS : case DNS_PROTOCOL_LLMNR: case DNS_PROTOCOL_MDNS: _found = 1 ; break; default: break; } _found; })) { |
| 1152 | |
| 1153 | /* When dealing with protocols other than mDNS only consider responses with |
| 1154 | * equivalent query section to the request. For mDNS this check doesn't make |
| 1155 | * sense, because the section 6 of RFC6762 states that "Multicast DNS responses MUST NOT |
| 1156 | * contain any questions in the Question Section". */ |
| 1157 | if (t->scope->protocol != DNS_PROTOCOL_MDNS) { |
| 1158 | r = dns_packet_is_reply_for(p, t->key); |
| 1159 | if (r < 0) |
| 1160 | goto fail; |
| 1161 | if (r == 0) { |
| 1162 | dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); |
| 1163 | return; |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | /* Install the answer as answer to the transaction */ |
| 1168 | dns_answer_unref(t->answer); |
| 1169 | t->answer = dns_answer_ref(p->answer); |
| 1170 | t->answer_rcode = DNS_PACKET_RCODE(p); |
| 1171 | t->answer_dnssec_result = _DNSSEC_RESULT_INVALID; |
| 1172 | t->answer_authenticated = false0; |
| 1173 | |
| 1174 | r = dns_transaction_fix_rcode(t); |
| 1175 | if (r < 0) |
| 1176 | goto fail; |
| 1177 | |
| 1178 | /* Block GC while starting requests for additional DNSSEC RRs */ |
| 1179 | t->block_gc++; |
| 1180 | r = dns_transaction_request_dnssec_keys(t); |
| 1181 | t->block_gc--; |
| 1182 | |
| 1183 | /* Maybe the transaction is ready for GC'ing now? If so, free it and return. */ |
| 1184 | if (!dns_transaction_gc(t)) |
| 1185 | return; |
| 1186 | |
| 1187 | /* Requesting additional keys might have resulted in |
| 1188 | * this transaction to fail, since the auxiliary |
| 1189 | * request failed for some reason. If so, we are not |
| 1190 | * in pending state anymore, and we should exit |
| 1191 | * quickly. */ |
| 1192 | if (t->state != DNS_TRANSACTION_PENDING) |
| 1193 | return; |
| 1194 | if (r < 0) |
| 1195 | goto fail; |
| 1196 | if (r > 0) { |
| 1197 | /* There are DNSSEC transactions pending now. Update the state accordingly. */ |
| 1198 | t->state = DNS_TRANSACTION_VALIDATING; |
| 1199 | dns_transaction_close_connection(t); |
| 1200 | dns_transaction_stop_timeout(t); |
| 1201 | return; |
| 1202 | } |
| 1203 | } |
| 1204 | |
| 1205 | dns_transaction_process_dnssec(t); |
| 1206 | return; |
| 1207 | |
| 1208 | fail: |
| 1209 | t->answer_errno = -r; |
| 1210 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); |
| 1211 | } |
| 1212 | |
| 1213 | static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
| 1214 | _cleanup_(dns_packet_unrefp)__attribute__((cleanup(dns_packet_unrefp))) DnsPacket *p = NULL((void*)0); |
| 1215 | DnsTransaction *t = userdata; |
| 1216 | int r; |
| 1217 | |
| 1218 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1218, __PRETTY_FUNCTION__); } while (0); |
| 1219 | assert(t->scope)do { if ((__builtin_expect(!!(!(t->scope)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t->scope"), "../src/resolve/resolved-dns-transaction.c" , 1219, __PRETTY_FUNCTION__); } while (0); |
| 1220 | |
| 1221 | r = manager_recv(t->scope->manager, fd, DNS_PROTOCOL_DNS, &p); |
| 1222 | if (ERRNO_IS_DISCONNECT(-r)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){107, 104, 111, 103, 32, 101})/sizeof(int )]; switch(-r) { case 107: case 104: case 111: case 103: case 32: case 101: _found = 1; break; default: break; } _found; } )) { |
| 1223 | usec_t usec; |
| 1224 | |
| 1225 | /* UDP connection failure get reported via ICMP and then are possible delivered to us on the next |
| 1226 | * recvmsg(). Treat this like a lost packet. */ |
| 1227 | |
| 1228 | log_debug_errno(r, "Connection failure for DNS UDP packet: %m")({ int _level = ((7)), _e = ((r)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1228, __func__ , "Connection failure for DNS UDP packet: %m") : -abs(_e); }); |
| 1229 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &usec) >= 0)do { if ((__builtin_expect(!!(!(sd_event_now(t->scope-> manager->event, clock_boottime_or_monotonic(), &usec) >= 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &usec) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 1229, __PRETTY_FUNCTION__ ); } while (0); |
| 1230 | dns_server_packet_lost(t->server, IPPROTO_UDPIPPROTO_UDP, t->current_feature_level); |
| 1231 | |
| 1232 | dns_transaction_retry(t, true1); |
| 1233 | return 0; |
| 1234 | } |
| 1235 | if (r < 0) { |
| 1236 | dns_transaction_complete(t, DNS_TRANSACTION_ERRNO); |
| 1237 | t->answer_errno = -r; |
| 1238 | return 0; |
| 1239 | } |
| 1240 | |
| 1241 | r = dns_packet_validate_reply(p); |
| 1242 | if (r < 0) { |
| 1243 | log_debug_errno(r, "Received invalid DNS packet as response, ignoring: %m")({ int _level = ((7)), _e = ((r)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1243, __func__ , "Received invalid DNS packet as response, ignoring: %m") : - abs(_e); }); |
| 1244 | return 0; |
| 1245 | } |
| 1246 | if (r == 0) { |
| 1247 | log_debug("Received inappropriate DNS packet as response, ignoring.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1247, __func__ , "Received inappropriate DNS packet as response, ignoring.") : -abs(_e); }); |
| 1248 | return 0; |
| 1249 | } |
| 1250 | |
| 1251 | if (DNS_PACKET_ID(p)((DnsPacketHeader*) DNS_PACKET_DATA(p))->id != t->id) { |
| 1252 | log_debug("Received packet with incorrect transaction ID, ignoring.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1252, __func__ , "Received packet with incorrect transaction ID, ignoring.") : -abs(_e); }); |
| 1253 | return 0; |
| 1254 | } |
| 1255 | |
| 1256 | dns_transaction_process_reply(t, p); |
| 1257 | return 0; |
| 1258 | } |
| 1259 | |
| 1260 | static int dns_transaction_emit_udp(DnsTransaction *t) { |
| 1261 | int r; |
| 1262 | |
| 1263 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1263, __PRETTY_FUNCTION__); } while (0); |
| 1264 | |
| 1265 | if (t->scope->protocol == DNS_PROTOCOL_DNS) { |
| 1266 | |
| 1267 | r = dns_transaction_pick_server(t); |
| 1268 | if (r < 0) |
| 1269 | return r; |
| 1270 | |
| 1271 | if (t->current_feature_level < DNS_SERVER_FEATURE_LEVEL_UDP || DNS_SERVER_FEATURE_LEVEL_IS_TLS(t->current_feature_level)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO })/sizeof(int)]; switch(t->current_feature_level) { case DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN : case DNS_SERVER_FEATURE_LEVEL_TLS_DO: _found = 1; break; default : break; } _found; })) |
| 1272 | return -EAGAIN11; /* Sorry, can't do UDP, try TCP! */ |
| 1273 | |
| 1274 | if (!dns_server_dnssec_supported(t->server) && dns_type_is_dnssec(t->key->type)) |
| 1275 | return -EOPNOTSUPP95; |
| 1276 | |
| 1277 | if (r > 0 || t->dns_udp_fd < 0) { /* Server changed, or no connection yet. */ |
| 1278 | int fd; |
| 1279 | |
| 1280 | dns_transaction_close_connection(t); |
| 1281 | |
| 1282 | fd = dns_scope_socket_udp(t->scope, t->server, 53); |
| 1283 | if (fd < 0) |
| 1284 | return fd; |
| 1285 | |
| 1286 | r = sd_event_add_io(t->scope->manager->event, &t->dns_udp_event_source, fd, EPOLLINEPOLLIN, on_dns_packet, t); |
| 1287 | if (r < 0) { |
| 1288 | safe_close(fd); |
| 1289 | return r; |
| 1290 | } |
| 1291 | |
| 1292 | (void) sd_event_source_set_description(t->dns_udp_event_source, "dns-transaction-udp"); |
| 1293 | t->dns_udp_fd = fd; |
| 1294 | } |
| 1295 | |
| 1296 | r = dns_server_adjust_opt(t->server, t->sent, t->current_feature_level); |
| 1297 | if (r < 0) |
| 1298 | return r; |
| 1299 | } else |
| 1300 | dns_transaction_close_connection(t); |
| 1301 | |
| 1302 | r = dns_scope_emit_udp(t->scope, t->dns_udp_fd, t->sent); |
| 1303 | if (r < 0) |
| 1304 | return r; |
| 1305 | |
| 1306 | dns_transaction_reset_answer(t); |
| 1307 | |
| 1308 | return 0; |
| 1309 | } |
| 1310 | |
| 1311 | static int on_transaction_timeout(sd_event_source *s, usec_t usec, void *userdata) { |
| 1312 | DnsTransaction *t = userdata; |
| 1313 | |
| 1314 | assert(s)do { if ((__builtin_expect(!!(!(s)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("s"), "../src/resolve/resolved-dns-transaction.c" , 1314, __PRETTY_FUNCTION__); } while (0); |
| 1315 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1315, __PRETTY_FUNCTION__); } while (0); |
| 1316 | |
| 1317 | if (!t->initial_jitter_scheduled || t->initial_jitter_elapsed) { |
| 1318 | /* Timeout reached? Increase the timeout for the server used */ |
| 1319 | switch (t->scope->protocol) { |
| 1320 | |
| 1321 | case DNS_PROTOCOL_DNS: |
| 1322 | assert(t->server)do { if ((__builtin_expect(!!(!(t->server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t->server"), "../src/resolve/resolved-dns-transaction.c" , 1322, __PRETTY_FUNCTION__); } while (0); |
| 1323 | dns_server_packet_lost(t->server, t->stream ? IPPROTO_TCPIPPROTO_TCP : IPPROTO_UDPIPPROTO_UDP, t->current_feature_level); |
| 1324 | break; |
| 1325 | |
| 1326 | case DNS_PROTOCOL_LLMNR: |
| 1327 | case DNS_PROTOCOL_MDNS: |
| 1328 | dns_scope_packet_lost(t->scope, usec - t->start_usec); |
| 1329 | break; |
| 1330 | |
| 1331 | default: |
| 1332 | assert_not_reached("Invalid DNS protocol.")do { log_assert_failed_unreachable_realm(LOG_REALM_SYSTEMD, ( "Invalid DNS protocol."), "../src/resolve/resolved-dns-transaction.c" , 1332, __PRETTY_FUNCTION__); } while (0); |
| 1333 | } |
| 1334 | |
| 1335 | if (t->initial_jitter_scheduled) |
| 1336 | t->initial_jitter_elapsed = true1; |
| 1337 | } |
| 1338 | |
| 1339 | log_debug("Timeout reached on transaction %" PRIu16 ".", t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1339, __func__ , "Timeout reached on transaction %" "u" ".", t->id) : -abs (_e); }); |
| 1340 | |
| 1341 | dns_transaction_retry(t, true1); |
| 1342 | return 0; |
| 1343 | } |
| 1344 | |
| 1345 | static usec_t transaction_get_resend_timeout(DnsTransaction *t) { |
| 1346 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1346, __PRETTY_FUNCTION__); } while (0); |
| 1347 | assert(t->scope)do { if ((__builtin_expect(!!(!(t->scope)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t->scope"), "../src/resolve/resolved-dns-transaction.c" , 1347, __PRETTY_FUNCTION__); } while (0); |
| 1348 | |
| 1349 | switch (t->scope->protocol) { |
| 1350 | |
| 1351 | case DNS_PROTOCOL_DNS: |
| 1352 | |
| 1353 | /* When we do TCP, grant a much longer timeout, as in this case there's no need for us to quickly |
| 1354 | * resend, as the kernel does that anyway for us, and we really don't want to interrupt it in that |
| 1355 | * needlessly. */ |
| 1356 | if (t->stream) |
| 1357 | return TRANSACTION_TCP_TIMEOUT_USEC(10U*((usec_t) 1000000ULL)); |
| 1358 | |
| 1359 | return DNS_TIMEOUT_USEC((120 * ((usec_t) 1000000ULL)) / 24); |
| 1360 | |
| 1361 | case DNS_PROTOCOL_MDNS: |
| 1362 | assert(t->n_attempts > 0)do { if ((__builtin_expect(!!(!(t->n_attempts > 0)),0)) ) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("t->n_attempts > 0" ), "../src/resolve/resolved-dns-transaction.c", 1362, __PRETTY_FUNCTION__ ); } while (0); |
| 1363 | if (t->probing) |
| 1364 | return MDNS_PROBING_INTERVAL_USEC(250 * ((usec_t) 1000ULL)); |
| 1365 | else |
| 1366 | return (1 << (t->n_attempts - 1)) * USEC_PER_SEC((usec_t) 1000000ULL); |
| 1367 | |
| 1368 | case DNS_PROTOCOL_LLMNR: |
| 1369 | return t->scope->resend_timeout; |
| 1370 | |
| 1371 | default: |
| 1372 | assert_not_reached("Invalid DNS protocol.")do { log_assert_failed_unreachable_realm(LOG_REALM_SYSTEMD, ( "Invalid DNS protocol."), "../src/resolve/resolved-dns-transaction.c" , 1372, __PRETTY_FUNCTION__); } while (0); |
| 1373 | } |
| 1374 | } |
| 1375 | |
| 1376 | static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) { |
| 1377 | int r; |
| 1378 | |
| 1379 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1379, __PRETTY_FUNCTION__); } while (0); |
| 1380 | |
| 1381 | dns_transaction_stop_timeout(t); |
| 1382 | |
| 1383 | r = dns_scope_network_good(t->scope); |
| 1384 | if (r < 0) |
| 1385 | return r; |
| 1386 | if (r == 0) { |
| 1387 | dns_transaction_complete(t, DNS_TRANSACTION_NETWORK_DOWN); |
| 1388 | return 0; |
| 1389 | } |
| 1390 | |
| 1391 | if (t->n_attempts >= TRANSACTION_ATTEMPTS_MAX(t->scope->protocol)(((t->scope->protocol) == DNS_PROTOCOL_LLMNR) ? 3 : ((( t->scope->protocol) == DNS_PROTOCOL_MDNS) ? 3 : 24))) { |
| 1392 | dns_transaction_complete(t, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED); |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && t->tried_stream) { |
| 1397 | /* If we already tried via a stream, then we don't |
| 1398 | * retry on LLMNR. See RFC 4795, Section 2.7. */ |
| 1399 | dns_transaction_complete(t, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED); |
| 1400 | return 0; |
| 1401 | } |
| 1402 | |
| 1403 | t->n_attempts++; |
| 1404 | t->start_usec = ts; |
| 1405 | |
| 1406 | dns_transaction_reset_answer(t); |
| 1407 | dns_transaction_flush_dnssec_transactions(t); |
| 1408 | |
| 1409 | /* Check the trust anchor. Do so only on classic DNS, since DNSSEC does not apply otherwise. */ |
| 1410 | if (t->scope->protocol == DNS_PROTOCOL_DNS) { |
| 1411 | r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, t->key, &t->answer); |
| 1412 | if (r < 0) |
| 1413 | return r; |
| 1414 | if (r > 0) { |
| 1415 | t->answer_rcode = DNS_RCODE_SUCCESS; |
| 1416 | t->answer_source = DNS_TRANSACTION_TRUST_ANCHOR; |
| 1417 | t->answer_authenticated = true1; |
| 1418 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
| 1419 | return 0; |
| 1420 | } |
| 1421 | |
| 1422 | if (dns_name_is_root(dns_resource_key_name(t->key)) && |
| 1423 | t->key->type == DNS_TYPE_DS) { |
| 1424 | |
| 1425 | /* Hmm, this is a request for the root DS? A |
| 1426 | * DS RR doesn't exist in the root zone, and |
| 1427 | * if our trust anchor didn't know it either, |
| 1428 | * this means we cannot do any DNSSEC logic |
| 1429 | * anymore. */ |
| 1430 | |
| 1431 | if (t->scope->dnssec_mode == DNSSEC_ALLOW_DOWNGRADE) { |
| 1432 | /* We are in downgrade mode. In this |
| 1433 | * case, synthesize an unsigned empty |
| 1434 | * response, so that the any lookup |
| 1435 | * depending on this one can continue |
| 1436 | * assuming there was no DS, and hence |
| 1437 | * the root zone was unsigned. */ |
| 1438 | |
| 1439 | t->answer_rcode = DNS_RCODE_SUCCESS; |
| 1440 | t->answer_source = DNS_TRANSACTION_TRUST_ANCHOR; |
| 1441 | t->answer_authenticated = false0; |
| 1442 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
| 1443 | } else |
| 1444 | /* If we are not in downgrade mode, |
| 1445 | * then fail the lookup, because we |
| 1446 | * cannot reasonably answer it. There |
| 1447 | * might be DS RRs, but we don't know |
| 1448 | * them, and the DNS server won't tell |
| 1449 | * them to us (and even if it would, |
| 1450 | * we couldn't validate and trust them. */ |
| 1451 | dns_transaction_complete(t, DNS_TRANSACTION_NO_TRUST_ANCHOR); |
| 1452 | |
| 1453 | return 0; |
| 1454 | } |
| 1455 | } |
| 1456 | |
| 1457 | /* Check the zone, but only if this transaction is not used |
| 1458 | * for probing or verifying a zone item. */ |
| 1459 | if (set_isempty(t->notify_zone_items)) { |
| 1460 | |
| 1461 | r = dns_zone_lookup(&t->scope->zone, t->key, dns_scope_ifindex(t->scope), &t->answer, NULL((void*)0), NULL((void*)0)); |
| 1462 | if (r < 0) |
| 1463 | return r; |
| 1464 | if (r > 0) { |
| 1465 | t->answer_rcode = DNS_RCODE_SUCCESS; |
| 1466 | t->answer_source = DNS_TRANSACTION_ZONE; |
| 1467 | t->answer_authenticated = true1; |
| 1468 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
| 1469 | return 0; |
| 1470 | } |
| 1471 | } |
| 1472 | |
| 1473 | /* Check the cache, but only if this transaction is not used |
| 1474 | * for probing or verifying a zone item. */ |
| 1475 | if (set_isempty(t->notify_zone_items)) { |
| 1476 | |
| 1477 | /* Before trying the cache, let's make sure we figured out a |
| 1478 | * server to use. Should this cause a change of server this |
| 1479 | * might flush the cache. */ |
| 1480 | (void) dns_scope_get_dns_server(t->scope); |
| 1481 | |
| 1482 | /* Let's then prune all outdated entries */ |
| 1483 | dns_cache_prune(&t->scope->cache); |
| 1484 | |
| 1485 | r = dns_cache_lookup(&t->scope->cache, t->key, t->clamp_ttl, &t->answer_rcode, &t->answer, &t->answer_authenticated); |
| 1486 | if (r < 0) |
| 1487 | return r; |
| 1488 | if (r > 0) { |
| 1489 | t->answer_source = DNS_TRANSACTION_CACHE; |
| 1490 | if (t->answer_rcode == DNS_RCODE_SUCCESS) |
| 1491 | dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); |
| 1492 | else |
| 1493 | dns_transaction_complete(t, DNS_TRANSACTION_RCODE_FAILURE); |
| 1494 | return 0; |
| 1495 | } |
| 1496 | } |
| 1497 | |
| 1498 | return 1; |
| 1499 | } |
| 1500 | |
| 1501 | static int dns_transaction_make_packet_mdns(DnsTransaction *t) { |
| 1502 | |
| 1503 | _cleanup_(dns_packet_unrefp)__attribute__((cleanup(dns_packet_unrefp))) DnsPacket *p = NULL((void*)0); |
| 1504 | bool_Bool add_known_answers = false0; |
| 1505 | DnsTransaction *other; |
| 1506 | Iterator i; |
| 1507 | DnsResourceKey *tkey; |
| 1508 | _cleanup_set_free___attribute__((cleanup(set_freep))) Set *keys = NULL((void*)0); |
| 1509 | unsigned qdcount; |
| 1510 | unsigned nscount = 0; |
| 1511 | usec_t ts; |
| 1512 | int r; |
| 1513 | |
| 1514 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1514, __PRETTY_FUNCTION__); } while (0); |
| 1515 | assert(t->scope->protocol == DNS_PROTOCOL_MDNS)do { if ((__builtin_expect(!!(!(t->scope->protocol == DNS_PROTOCOL_MDNS )),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("t->scope->protocol == DNS_PROTOCOL_MDNS" ), "../src/resolve/resolved-dns-transaction.c", 1515, __PRETTY_FUNCTION__ ); } while (0); |
| 1516 | |
| 1517 | /* Discard any previously prepared packet, so we can start over and coalesce again */ |
| 1518 | t->sent = dns_packet_unref(t->sent); |
| 1519 | |
| 1520 | r = dns_packet_new_query(&p, t->scope->protocol, 0, false0); |
| 1521 | if (r < 0) |
| 1522 | return r; |
| 1523 | |
| 1524 | r = dns_packet_append_key(p, t->key, 0, NULL((void*)0)); |
| 1525 | if (r < 0) |
| 1526 | return r; |
| 1527 | |
| 1528 | qdcount = 1; |
| 1529 | |
| 1530 | if (dns_key_is_shared(t->key)) |
| 1531 | add_known_answers = true1; |
| 1532 | |
| 1533 | if (t->key->type == DNS_TYPE_ANY) { |
| 1534 | r = set_ensure_allocated(&keys, &dns_resource_key_hash_ops)internal_set_ensure_allocated(&keys, &dns_resource_key_hash_ops ); |
| 1535 | if (r < 0) |
| 1536 | return r; |
| 1537 | |
| 1538 | r = set_put(keys, t->key); |
| 1539 | if (r < 0) |
| 1540 | return r; |
| 1541 | } |
| 1542 | |
| 1543 | /* |
| 1544 | * For mDNS, we want to coalesce as many open queries in pending transactions into one single |
| 1545 | * query packet on the wire as possible. To achieve that, we iterate through all pending transactions |
| 1546 | * in our current scope, and see whether their timing contraints allow them to be sent. |
| 1547 | */ |
| 1548 | |
| 1549 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0)do { if ((__builtin_expect(!!(!(sd_event_now(t->scope-> manager->event, clock_boottime_or_monotonic(), &ts) >= 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 1549, __PRETTY_FUNCTION__ ); } while (0); |
| 1550 | |
| 1551 | LIST_FOREACH(transactions_by_scope, other, t->scope->transactions)for ((other) = (t->scope->transactions); (other); (other ) = (other)->transactions_by_scope_next) { |
| 1552 | |
| 1553 | /* Skip ourselves */ |
| 1554 | if (other == t) |
| 1555 | continue; |
| 1556 | |
| 1557 | if (other->state != DNS_TRANSACTION_PENDING) |
| 1558 | continue; |
| 1559 | |
| 1560 | if (other->next_attempt_after > ts) |
| 1561 | continue; |
| 1562 | |
| 1563 | if (qdcount >= UINT16_MAX(65535)) |
| 1564 | break; |
| 1565 | |
| 1566 | r = dns_packet_append_key(p, other->key, 0, NULL((void*)0)); |
| 1567 | |
| 1568 | /* |
| 1569 | * If we can't stuff more questions into the packet, just give up. |
| 1570 | * One of the 'other' transactions will fire later and take care of the rest. |
| 1571 | */ |
| 1572 | if (r == -EMSGSIZE90) |
| 1573 | break; |
| 1574 | |
| 1575 | if (r < 0) |
| 1576 | return r; |
| 1577 | |
| 1578 | r = dns_transaction_prepare(other, ts); |
| 1579 | if (r <= 0) |
| 1580 | continue; |
| 1581 | |
| 1582 | ts += transaction_get_resend_timeout(other); |
| 1583 | |
| 1584 | r = sd_event_add_time( |
| 1585 | other->scope->manager->event, |
| 1586 | &other->timeout_event_source, |
| 1587 | clock_boottime_or_monotonic(), |
| 1588 | ts, 0, |
| 1589 | on_transaction_timeout, other); |
| 1590 | if (r < 0) |
| 1591 | return r; |
| 1592 | |
| 1593 | (void) sd_event_source_set_description(other->timeout_event_source, "dns-transaction-timeout"); |
| 1594 | |
| 1595 | other->state = DNS_TRANSACTION_PENDING; |
| 1596 | other->next_attempt_after = ts; |
| 1597 | |
| 1598 | qdcount++; |
| 1599 | |
| 1600 | if (dns_key_is_shared(other->key)) |
| 1601 | add_known_answers = true1; |
| 1602 | |
| 1603 | if (other->key->type == DNS_TYPE_ANY) { |
| 1604 | r = set_ensure_allocated(&keys, &dns_resource_key_hash_ops)internal_set_ensure_allocated(&keys, &dns_resource_key_hash_ops ); |
| 1605 | if (r < 0) |
| 1606 | return r; |
| 1607 | |
| 1608 | r = set_put(keys, other->key); |
| 1609 | if (r < 0) |
| 1610 | return r; |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | DNS_PACKET_HEADER(p)((DnsPacketHeader*) DNS_PACKET_DATA(p))->qdcount = htobe16(qdcount); |
| 1615 | |
| 1616 | /* Append known answer section if we're asking for any shared record */ |
| 1617 | if (add_known_answers) { |
| 1618 | r = dns_cache_export_shared_to_packet(&t->scope->cache, p); |
| 1619 | if (r < 0) |
| 1620 | return r; |
| 1621 | } |
| 1622 | |
| 1623 | SET_FOREACH(tkey, keys, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((keys), &(i), (void **)&(tkey)); ) { |
| 1624 | _cleanup_(dns_answer_unrefp)__attribute__((cleanup(dns_answer_unrefp))) DnsAnswer *answer = NULL((void*)0); |
| 1625 | bool_Bool tentative; |
| 1626 | |
| 1627 | r = dns_zone_lookup(&t->scope->zone, tkey, t->scope->link->ifindex, &answer, NULL((void*)0), &tentative); |
| 1628 | if (r < 0) |
| 1629 | return r; |
| 1630 | |
| 1631 | r = dns_packet_append_answer(p, answer); |
| 1632 | if (r < 0) |
| 1633 | return r; |
| 1634 | |
| 1635 | nscount += dns_answer_size(answer); |
| 1636 | } |
| 1637 | DNS_PACKET_HEADER(p)((DnsPacketHeader*) DNS_PACKET_DATA(p))->nscount = htobe16(nscount); |
| 1638 | |
| 1639 | t->sent = TAKE_PTR(p)({ typeof(p) _ptr_ = (p); (p) = ((void*)0); _ptr_; }); |
| 1640 | |
| 1641 | return 0; |
| 1642 | } |
| 1643 | |
| 1644 | static int dns_transaction_make_packet(DnsTransaction *t) { |
| 1645 | _cleanup_(dns_packet_unrefp)__attribute__((cleanup(dns_packet_unrefp))) DnsPacket *p = NULL((void*)0); |
| 1646 | int r; |
| 1647 | |
| 1648 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1648, __PRETTY_FUNCTION__); } while (0); |
| 1649 | |
| 1650 | if (t->scope->protocol == DNS_PROTOCOL_MDNS) |
| 1651 | return dns_transaction_make_packet_mdns(t); |
| 1652 | |
| 1653 | if (t->sent) |
| 1654 | return 0; |
| 1655 | |
| 1656 | r = dns_packet_new_query(&p, t->scope->protocol, 0, t->scope->dnssec_mode != DNSSEC_NO); |
| 1657 | if (r < 0) |
| 1658 | return r; |
| 1659 | |
| 1660 | r = dns_packet_append_key(p, t->key, 0, NULL((void*)0)); |
| 1661 | if (r < 0) |
| 1662 | return r; |
| 1663 | |
| 1664 | DNS_PACKET_HEADER(p)((DnsPacketHeader*) DNS_PACKET_DATA(p))->qdcount = htobe16(1); |
| 1665 | DNS_PACKET_HEADER(p)((DnsPacketHeader*) DNS_PACKET_DATA(p))->id = t->id; |
| 1666 | |
| 1667 | t->sent = TAKE_PTR(p)({ typeof(p) _ptr_ = (p); (p) = ((void*)0); _ptr_; }); |
| 1668 | |
| 1669 | return 0; |
| 1670 | } |
| 1671 | |
| 1672 | int dns_transaction_go(DnsTransaction *t) { |
| 1673 | usec_t ts; |
| 1674 | int r; |
| 1675 | char key_str[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 1676 | |
| 1677 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1677, __PRETTY_FUNCTION__); } while (0); |
| 1678 | |
| 1679 | /* Returns > 0 if the transaction is now pending, returns 0 if could be processed immediately and has finished |
| 1680 | * now. */ |
| 1681 | |
| 1682 | assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0)do { if ((__builtin_expect(!!(!(sd_event_now(t->scope-> manager->event, clock_boottime_or_monotonic(), &ts) >= 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0" ), "../src/resolve/resolved-dns-transaction.c", 1682, __PRETTY_FUNCTION__ ); } while (0); |
| 1683 | |
| 1684 | r = dns_transaction_prepare(t, ts); |
| 1685 | if (r <= 0) |
| 1686 | return r; |
| 1687 | |
| 1688 | log_debug("Transaction %" PRIu16 " for <%s> scope %s on %s/%s.",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1693, __func__ , "Transaction %" "u" " for <%s> scope %s on %s/%s.", t ->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family)) : -abs(_e); }) |
| 1689 | t->id,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1693, __func__ , "Transaction %" "u" " for <%s> scope %s on %s/%s.", t ->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family)) : -abs(_e); }) |
| 1690 | dns_resource_key_to_string(t->key, key_str, sizeof key_str),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1693, __func__ , "Transaction %" "u" " for <%s> scope %s on %s/%s.", t ->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family)) : -abs(_e); }) |
| 1691 | dns_protocol_to_string(t->scope->protocol),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1693, __func__ , "Transaction %" "u" " for <%s> scope %s on %s/%s.", t ->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family)) : -abs(_e); }) |
| 1692 | t->scope->link ? t->scope->link->name : "*",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1693, __func__ , "Transaction %" "u" " for <%s> scope %s on %s/%s.", t ->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family)) : -abs(_e); }) |
| 1693 | af_to_name_short(t->scope->family))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1693, __func__ , "Transaction %" "u" " for <%s> scope %s on %s/%s.", t ->id, dns_resource_key_to_string(t->key, key_str, sizeof key_str), dns_protocol_to_string(t->scope->protocol), t ->scope->link ? t->scope->link->name : "*", af_to_name_short (t->scope->family)) : -abs(_e); }); |
| 1694 | |
| 1695 | if (!t->initial_jitter_scheduled && |
| 1696 | IN_SET(t->scope->protocol, DNS_PROTOCOL_LLMNR, DNS_PROTOCOL_MDNS)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_PROTOCOL_LLMNR, DNS_PROTOCOL_MDNS})/ sizeof(int)]; switch(t->scope->protocol) { case DNS_PROTOCOL_LLMNR : case DNS_PROTOCOL_MDNS: _found = 1; break; default: break; } _found; })) { |
| 1697 | usec_t jitter, accuracy; |
| 1698 | |
| 1699 | /* RFC 4795 Section 2.7 suggests all queries should be |
| 1700 | * delayed by a random time from 0 to JITTER_INTERVAL. */ |
| 1701 | |
| 1702 | t->initial_jitter_scheduled = true1; |
| 1703 | |
| 1704 | random_bytes(&jitter, sizeof(jitter)); |
| 1705 | |
| 1706 | switch (t->scope->protocol) { |
| 1707 | |
| 1708 | case DNS_PROTOCOL_LLMNR: |
| 1709 | jitter %= LLMNR_JITTER_INTERVAL_USEC(100 * ((usec_t) 1000ULL)); |
| 1710 | accuracy = LLMNR_JITTER_INTERVAL_USEC(100 * ((usec_t) 1000ULL)); |
| 1711 | break; |
| 1712 | |
| 1713 | case DNS_PROTOCOL_MDNS: |
| 1714 | jitter %= MDNS_JITTER_RANGE_USEC(100 * ((usec_t) 1000ULL)); |
| 1715 | jitter += MDNS_JITTER_MIN_USEC(20 * ((usec_t) 1000ULL)); |
| 1716 | accuracy = MDNS_JITTER_RANGE_USEC(100 * ((usec_t) 1000ULL)); |
| 1717 | break; |
| 1718 | default: |
| 1719 | assert_not_reached("bad protocol")do { log_assert_failed_unreachable_realm(LOG_REALM_SYSTEMD, ( "bad protocol"), "../src/resolve/resolved-dns-transaction.c", 1719, __PRETTY_FUNCTION__); } while (0); |
| 1720 | } |
| 1721 | |
| 1722 | r = sd_event_add_time( |
| 1723 | t->scope->manager->event, |
| 1724 | &t->timeout_event_source, |
| 1725 | clock_boottime_or_monotonic(), |
| 1726 | ts + jitter, accuracy, |
| 1727 | on_transaction_timeout, t); |
| 1728 | if (r < 0) |
| 1729 | return r; |
| 1730 | |
| 1731 | (void) sd_event_source_set_description(t->timeout_event_source, "dns-transaction-timeout"); |
| 1732 | |
| 1733 | t->n_attempts = 0; |
| 1734 | t->next_attempt_after = ts; |
| 1735 | t->state = DNS_TRANSACTION_PENDING; |
| 1736 | |
| 1737 | log_debug("Delaying %s transaction for " USEC_FMT "us.", dns_protocol_to_string(t->scope->protocol), jitter)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1737, __func__ , "Delaying %s transaction for " "%" "l" "u" "us.", dns_protocol_to_string (t->scope->protocol), jitter) : -abs(_e); }); |
| 1738 | return 0; |
| 1739 | } |
| 1740 | |
| 1741 | /* Otherwise, we need to ask the network */ |
| 1742 | r = dns_transaction_make_packet(t); |
| 1743 | if (r < 0) |
| 1744 | return r; |
| 1745 | |
| 1746 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && |
| 1747 | (dns_name_endswith(dns_resource_key_name(t->key), "in-addr.arpa") > 0 || |
| 1748 | dns_name_endswith(dns_resource_key_name(t->key), "ip6.arpa") > 0)) { |
| 1749 | |
| 1750 | /* RFC 4795, Section 2.4. says reverse lookups shall |
| 1751 | * always be made via TCP on LLMNR */ |
| 1752 | r = dns_transaction_emit_tcp(t); |
| 1753 | } else { |
| 1754 | /* Try via UDP, and if that fails due to large size or lack of |
| 1755 | * support try via TCP */ |
| 1756 | r = dns_transaction_emit_udp(t); |
| 1757 | if (r == -EMSGSIZE90) |
| 1758 | log_debug("Sending query via TCP since it is too large.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1758, __func__ , "Sending query via TCP since it is too large.") : -abs(_e); }); |
| 1759 | else if (r == -EAGAIN11) |
| 1760 | log_debug("Sending query via TCP since UDP isn't supported.")({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1760, __func__ , "Sending query via TCP since UDP isn't supported.") : -abs( _e); }); |
| 1761 | if (IN_SET(r, -EMSGSIZE, -EAGAIN)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){-90, -11})/sizeof(int)]; switch(r) { case -90: case -11: _found = 1; break; default: break; } _found; } )) |
| 1762 | r = dns_transaction_emit_tcp(t); |
| 1763 | } |
| 1764 | |
| 1765 | if (r == -ESRCH3) { |
| 1766 | /* No servers to send this to? */ |
| 1767 | dns_transaction_complete(t, DNS_TRANSACTION_NO_SERVERS); |
| 1768 | return 0; |
| 1769 | } |
| 1770 | if (r == -EOPNOTSUPP95) { |
| 1771 | /* Tried to ask for DNSSEC RRs, on a server that doesn't do DNSSEC */ |
| 1772 | dns_transaction_complete(t, DNS_TRANSACTION_RR_TYPE_UNSUPPORTED); |
| 1773 | return 0; |
| 1774 | } |
| 1775 | if (t->scope->protocol == DNS_PROTOCOL_LLMNR && ERRNO_IS_DISCONNECT(-r)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){107, 104, 111, 103, 32, 101})/sizeof(int )]; switch(-r) { case 107: case 104: case 111: case 103: case 32: case 101: _found = 1; break; default: break; } _found; } )) { |
| 1776 | /* On LLMNR, if we cannot connect to a host via TCP when doing reverse lookups. This means we cannot |
| 1777 | * answer this request with this protocol. */ |
| 1778 | dns_transaction_complete(t, DNS_TRANSACTION_NOT_FOUND); |
| 1779 | return 0; |
| 1780 | } |
| 1781 | if (r < 0) { |
| 1782 | if (t->scope->protocol != DNS_PROTOCOL_DNS) |
| 1783 | return r; |
| 1784 | |
| 1785 | /* Couldn't send? Try immediately again, with a new server */ |
| 1786 | dns_scope_next_dns_server(t->scope); |
| 1787 | |
| 1788 | return dns_transaction_go(t); |
| 1789 | } |
| 1790 | |
| 1791 | ts += transaction_get_resend_timeout(t); |
| 1792 | |
| 1793 | r = sd_event_add_time( |
| 1794 | t->scope->manager->event, |
| 1795 | &t->timeout_event_source, |
| 1796 | clock_boottime_or_monotonic(), |
| 1797 | ts, 0, |
| 1798 | on_transaction_timeout, t); |
| 1799 | if (r < 0) |
| 1800 | return r; |
| 1801 | |
| 1802 | (void) sd_event_source_set_description(t->timeout_event_source, "dns-transaction-timeout"); |
| 1803 | |
| 1804 | t->state = DNS_TRANSACTION_PENDING; |
| 1805 | t->next_attempt_after = ts; |
| 1806 | |
| 1807 | return 1; |
| 1808 | } |
| 1809 | |
| 1810 | static int dns_transaction_find_cyclic(DnsTransaction *t, DnsTransaction *aux) { |
| 1811 | DnsTransaction *n; |
| 1812 | Iterator i; |
| 1813 | int r; |
| 1814 | |
| 1815 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1815, __PRETTY_FUNCTION__); } while (0); |
| 1816 | assert(aux)do { if ((__builtin_expect(!!(!(aux)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("aux"), "../src/resolve/resolved-dns-transaction.c" , 1816, __PRETTY_FUNCTION__); } while (0); |
| 1817 | |
| 1818 | /* Try to find cyclic dependencies between transaction objects */ |
| 1819 | |
| 1820 | if (t == aux) |
| 1821 | return 1; |
| 1822 | |
| 1823 | SET_FOREACH(n, aux->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((aux->dnssec_transactions ), &(i), (void**)&(n)); ) { |
| 1824 | r = dns_transaction_find_cyclic(t, n); |
| 1825 | if (r != 0) |
| 1826 | return r; |
| 1827 | } |
| 1828 | |
| 1829 | return 0; |
| 1830 | } |
| 1831 | |
| 1832 | static int dns_transaction_add_dnssec_transaction(DnsTransaction *t, DnsResourceKey *key, DnsTransaction **ret) { |
| 1833 | DnsTransaction *aux; |
| 1834 | int r; |
| 1835 | |
| 1836 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1836, __PRETTY_FUNCTION__); } while (0); |
| 1837 | assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("ret"), "../src/resolve/resolved-dns-transaction.c" , 1837, __PRETTY_FUNCTION__); } while (0); |
| 1838 | assert(key)do { if ((__builtin_expect(!!(!(key)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("key"), "../src/resolve/resolved-dns-transaction.c" , 1838, __PRETTY_FUNCTION__); } while (0); |
| 1839 | |
| 1840 | aux = dns_scope_find_transaction(t->scope, key, true1); |
| 1841 | if (!aux) { |
| 1842 | r = dns_transaction_new(&aux, t->scope, key); |
| 1843 | if (r < 0) |
| 1844 | return r; |
| 1845 | } else { |
| 1846 | if (set_contains(t->dnssec_transactions, aux)) { |
| 1847 | *ret = aux; |
| 1848 | return 0; |
| 1849 | } |
| 1850 | |
| 1851 | r = dns_transaction_find_cyclic(t, aux); |
| 1852 | if (r < 0) |
| 1853 | return r; |
| 1854 | if (r > 0) { |
| 1855 | char s[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)], saux[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 1856 | |
| 1857 | log_debug("Potential cyclic dependency, refusing to add transaction %" PRIu16 " (%s) as dependency for %" PRIu16 " (%s).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1861, __func__ , "Potential cyclic dependency, refusing to add transaction %" "u" " (%s) as dependency for %" "u" " (%s).", aux->id, dns_resource_key_to_string (t->key, s, sizeof s), t->id, dns_resource_key_to_string (aux->key, saux, sizeof saux)) : -abs(_e); }) |
| 1858 | aux->id,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1861, __func__ , "Potential cyclic dependency, refusing to add transaction %" "u" " (%s) as dependency for %" "u" " (%s).", aux->id, dns_resource_key_to_string (t->key, s, sizeof s), t->id, dns_resource_key_to_string (aux->key, saux, sizeof saux)) : -abs(_e); }) |
| 1859 | dns_resource_key_to_string(t->key, s, sizeof s),({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1861, __func__ , "Potential cyclic dependency, refusing to add transaction %" "u" " (%s) as dependency for %" "u" " (%s).", aux->id, dns_resource_key_to_string (t->key, s, sizeof s), t->id, dns_resource_key_to_string (aux->key, saux, sizeof saux)) : -abs(_e); }) |
| 1860 | t->id,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1861, __func__ , "Potential cyclic dependency, refusing to add transaction %" "u" " (%s) as dependency for %" "u" " (%s).", aux->id, dns_resource_key_to_string (t->key, s, sizeof s), t->id, dns_resource_key_to_string (aux->key, saux, sizeof saux)) : -abs(_e); }) |
| 1861 | dns_resource_key_to_string(aux->key, saux, sizeof saux))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 1861, __func__ , "Potential cyclic dependency, refusing to add transaction %" "u" " (%s) as dependency for %" "u" " (%s).", aux->id, dns_resource_key_to_string (t->key, s, sizeof s), t->id, dns_resource_key_to_string (aux->key, saux, sizeof saux)) : -abs(_e); }); |
| 1862 | |
| 1863 | return -ELOOP40; |
| 1864 | } |
| 1865 | } |
| 1866 | |
| 1867 | r = set_ensure_allocated(&t->dnssec_transactions, NULL)internal_set_ensure_allocated(&t->dnssec_transactions, ((void*)0) ); |
| 1868 | if (r < 0) |
| 1869 | goto gc; |
| 1870 | |
| 1871 | r = set_ensure_allocated(&aux->notify_transactions, NULL)internal_set_ensure_allocated(&aux->notify_transactions , ((void*)0) ); |
| 1872 | if (r < 0) |
| 1873 | goto gc; |
| 1874 | |
| 1875 | r = set_ensure_allocated(&aux->notify_transactions_done, NULL)internal_set_ensure_allocated(&aux->notify_transactions_done , ((void*)0) ); |
| 1876 | if (r < 0) |
| 1877 | goto gc; |
| 1878 | |
| 1879 | r = set_put(t->dnssec_transactions, aux); |
| 1880 | if (r < 0) |
| 1881 | goto gc; |
| 1882 | |
| 1883 | r = set_put(aux->notify_transactions, t); |
| 1884 | if (r < 0) { |
| 1885 | (void) set_remove(t->dnssec_transactions, aux); |
| 1886 | goto gc; |
| 1887 | } |
| 1888 | |
| 1889 | *ret = aux; |
| 1890 | return 1; |
| 1891 | |
| 1892 | gc: |
| 1893 | dns_transaction_gc(aux); |
| 1894 | return r; |
| 1895 | } |
| 1896 | |
| 1897 | static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *key) { |
| 1898 | _cleanup_(dns_answer_unrefp)__attribute__((cleanup(dns_answer_unrefp))) DnsAnswer *a = NULL((void*)0); |
| 1899 | DnsTransaction *aux; |
| 1900 | int r; |
| 1901 | |
| 1902 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1902, __PRETTY_FUNCTION__); } while (0); |
| 1903 | assert(key)do { if ((__builtin_expect(!!(!(key)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("key"), "../src/resolve/resolved-dns-transaction.c" , 1903, __PRETTY_FUNCTION__); } while (0); |
| 1904 | |
| 1905 | /* Try to get the data from the trust anchor */ |
| 1906 | r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, key, &a); |
| 1907 | if (r < 0) |
| 1908 | return r; |
| 1909 | if (r > 0) { |
| 1910 | r = dns_answer_extend(&t->validated_keys, a); |
| 1911 | if (r < 0) |
| 1912 | return r; |
| 1913 | |
| 1914 | return 0; |
| 1915 | } |
| 1916 | |
| 1917 | /* This didn't work, ask for it via the network/cache then. */ |
| 1918 | r = dns_transaction_add_dnssec_transaction(t, key, &aux); |
| 1919 | if (r == -ELOOP40) /* This would result in a cyclic dependency */ |
| 1920 | return 0; |
| 1921 | if (r < 0) |
| 1922 | return r; |
| 1923 | |
| 1924 | if (aux->state == DNS_TRANSACTION_NULL) { |
| 1925 | r = dns_transaction_go(aux); |
| 1926 | if (r < 0) |
| 1927 | return r; |
| 1928 | } |
| 1929 | |
| 1930 | return 1; |
| 1931 | } |
| 1932 | |
| 1933 | static int dns_transaction_negative_trust_anchor_lookup(DnsTransaction *t, const char *name) { |
| 1934 | int r; |
| 1935 | |
| 1936 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1936, __PRETTY_FUNCTION__); } while (0); |
| 1937 | |
| 1938 | /* Check whether the specified name is in the NTA |
| 1939 | * database, either in the global one, or the link-local |
| 1940 | * one. */ |
| 1941 | |
| 1942 | r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, name); |
| 1943 | if (r != 0) |
| 1944 | return r; |
| 1945 | |
| 1946 | if (!t->scope->link) |
| 1947 | return 0; |
| 1948 | |
| 1949 | return set_contains(t->scope->link->dnssec_negative_trust_anchors, name); |
| 1950 | } |
| 1951 | |
| 1952 | static int dns_transaction_has_unsigned_negative_answer(DnsTransaction *t) { |
| 1953 | int r; |
| 1954 | |
| 1955 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1955, __PRETTY_FUNCTION__); } while (0); |
| 1956 | |
| 1957 | /* Checks whether the answer is negative, and lacks NSEC/NSEC3 |
| 1958 | * RRs to prove it */ |
| 1959 | |
| 1960 | r = dns_transaction_has_positive_answer(t, NULL((void*)0)); |
| 1961 | if (r < 0) |
| 1962 | return r; |
| 1963 | if (r > 0) |
| 1964 | return false0; |
| 1965 | |
| 1966 | /* Is this key explicitly listed as a negative trust anchor? |
| 1967 | * If so, it's nothing we need to care about */ |
| 1968 | r = dns_transaction_negative_trust_anchor_lookup(t, dns_resource_key_name(t->key)); |
| 1969 | if (r < 0) |
| 1970 | return r; |
| 1971 | if (r > 0) |
| 1972 | return false0; |
| 1973 | |
| 1974 | /* The answer does not contain any RRs that match to the |
| 1975 | * question. If so, let's see if there are any NSEC/NSEC3 RRs |
| 1976 | * included. If not, the answer is unsigned. */ |
| 1977 | |
| 1978 | r = dns_answer_contains_nsec_or_nsec3(t->answer); |
| 1979 | if (r < 0) |
| 1980 | return r; |
| 1981 | if (r > 0) |
| 1982 | return false0; |
| 1983 | |
| 1984 | return true1; |
| 1985 | } |
| 1986 | |
| 1987 | static int dns_transaction_is_primary_response(DnsTransaction *t, DnsResourceRecord *rr) { |
| 1988 | int r; |
| 1989 | |
| 1990 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 1990, __PRETTY_FUNCTION__); } while (0); |
| 1991 | assert(rr)do { if ((__builtin_expect(!!(!(rr)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("rr"), "../src/resolve/resolved-dns-transaction.c" , 1991, __PRETTY_FUNCTION__); } while (0); |
| 1992 | |
| 1993 | /* Check if the specified RR is the "primary" response, |
| 1994 | * i.e. either matches the question precisely or is a |
| 1995 | * CNAME/DNAME for it. */ |
| 1996 | |
| 1997 | r = dns_resource_key_match_rr(t->key, rr, NULL((void*)0)); |
| 1998 | if (r != 0) |
| 1999 | return r; |
| 2000 | |
| 2001 | return dns_resource_key_match_cname_or_dname(t->key, rr->key, NULL((void*)0)); |
| 2002 | } |
| 2003 | |
| 2004 | static bool_Bool dns_transaction_dnssec_supported(DnsTransaction *t) { |
| 2005 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2005, __PRETTY_FUNCTION__); } while (0); |
| 2006 | |
| 2007 | /* Checks whether our transaction's DNS server is assumed to be compatible with DNSSEC. Returns false as soon |
| 2008 | * as we changed our mind about a server, and now believe it is incompatible with DNSSEC. */ |
| 2009 | |
| 2010 | if (t->scope->protocol != DNS_PROTOCOL_DNS) |
| 2011 | return false0; |
| 2012 | |
| 2013 | /* If we have picked no server, then we are working from the cache or some other source, and DNSSEC might well |
| 2014 | * be supported, hence return true. */ |
| 2015 | if (!t->server) |
| 2016 | return true1; |
| 2017 | |
| 2018 | /* Note that we do not check the feature level actually used for the transaction but instead the feature level |
| 2019 | * the server is known to support currently, as the transaction feature level might be lower than what the |
| 2020 | * server actually supports, since we might have downgraded this transaction's feature level because we got a |
| 2021 | * SERVFAIL earlier and wanted to check whether downgrading fixes it. */ |
| 2022 | |
| 2023 | return dns_server_dnssec_supported(t->server); |
| 2024 | } |
| 2025 | |
| 2026 | static bool_Bool dns_transaction_dnssec_supported_full(DnsTransaction *t) { |
| 2027 | DnsTransaction *dt; |
| 2028 | Iterator i; |
| 2029 | |
| 2030 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2030, __PRETTY_FUNCTION__); } while (0); |
| 2031 | |
| 2032 | /* Checks whether our transaction our any of the auxiliary transactions couldn't do DNSSEC. */ |
| 2033 | |
| 2034 | if (!dns_transaction_dnssec_supported(t)) |
| 2035 | return false0; |
| 2036 | |
| 2037 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) |
| 2038 | if (!dns_transaction_dnssec_supported(dt)) |
| 2039 | return false0; |
| 2040 | |
| 2041 | return true1; |
| 2042 | } |
| 2043 | |
| 2044 | int dns_transaction_request_dnssec_keys(DnsTransaction *t) { |
| 2045 | DnsResourceRecord *rr; |
| 2046 | |
| 2047 | int r; |
| 2048 | |
| 2049 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2049, __PRETTY_FUNCTION__); } while (0); |
| 2050 | |
| 2051 | /* |
| 2052 | * Retrieve all auxiliary RRs for the answer we got, so that |
| 2053 | * we can verify signatures or prove that RRs are rightfully |
| 2054 | * unsigned. Specifically: |
| 2055 | * |
| 2056 | * - For RRSIG we get the matching DNSKEY |
| 2057 | * - For DNSKEY we get the matching DS |
| 2058 | * - For unsigned SOA/NS we get the matching DS |
| 2059 | * - For unsigned CNAME/DNAME/DS we get the parent SOA RR |
| 2060 | * - For other unsigned RRs we get the matching SOA RR |
| 2061 | * - For SOA/NS queries with no matching response RR, and no NSEC/NSEC3, the DS RR |
| 2062 | * - For DS queries with no matching response RRs, and no NSEC/NSEC3, the parent's SOA RR |
| 2063 | * - For other queries with no matching response RRs, and no NSEC/NSEC3, the SOA RR |
| 2064 | */ |
| 2065 | |
| 2066 | if (t->scope->dnssec_mode == DNSSEC_NO) |
| 2067 | return 0; |
| 2068 | if (t->answer_source != DNS_TRANSACTION_NETWORK) |
| 2069 | return 0; /* We only need to validate stuff from the network */ |
| 2070 | if (!dns_transaction_dnssec_supported(t)) |
| 2071 | return 0; /* If we can't do DNSSEC anyway there's no point in geting the auxiliary RRs */ |
| 2072 | |
| 2073 | DNS_ANSWER_FOREACH(rr, t->answer)for (size_t __unique_prefix_i21 = ({ (rr) = ((t->answer) && (t->answer)->n_rrs > 0) ? (t->answer)->items[ 0].rr : ((void*)0); 0; }); (t->answer) && (__unique_prefix_i21 < (t->answer)->n_rrs); __unique_prefix_i21++, (rr) = (__unique_prefix_i21 < (t->answer)->n_rrs ? (t-> answer)->items[__unique_prefix_i21].rr : ((void*)0))) { |
| 2074 | |
| 2075 | if (dns_type_is_pseudo(rr->key->type)) |
| 2076 | continue; |
| 2077 | |
| 2078 | /* If this RR is in the negative trust anchor, we don't need to validate it. */ |
| 2079 | r = dns_transaction_negative_trust_anchor_lookup(t, dns_resource_key_name(rr->key)); |
| 2080 | if (r < 0) |
| 2081 | return r; |
| 2082 | if (r > 0) |
| 2083 | continue; |
| 2084 | |
| 2085 | switch (rr->key->type) { |
| 2086 | |
| 2087 | case DNS_TYPE_RRSIG: { |
| 2088 | /* For each RRSIG we request the matching DNSKEY */ |
| 2089 | _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *dnskey = NULL((void*)0); |
| 2090 | |
| 2091 | /* If this RRSIG is about a DNSKEY RR and the |
| 2092 | * signer is the same as the owner, then we |
| 2093 | * already have the DNSKEY, and we don't have |
| 2094 | * to look for more. */ |
| 2095 | if (rr->rrsig.type_covered == DNS_TYPE_DNSKEY) { |
| 2096 | r = dns_name_equal(rr->rrsig.signer, dns_resource_key_name(rr->key)); |
| 2097 | if (r < 0) |
| 2098 | return r; |
| 2099 | if (r > 0) |
| 2100 | continue; |
| 2101 | } |
| 2102 | |
| 2103 | /* If the signer is not a parent of our |
| 2104 | * original query, then this is about an |
| 2105 | * auxiliary RRset, but not anything we asked |
| 2106 | * for. In this case we aren't interested, |
| 2107 | * because we don't want to request additional |
| 2108 | * RRs for stuff we didn't really ask for, and |
| 2109 | * also to avoid request loops, where |
| 2110 | * additional RRs from one transaction result |
| 2111 | * in another transaction whose additonal RRs |
| 2112 | * point back to the original transaction, and |
| 2113 | * we deadlock. */ |
| 2114 | r = dns_name_endswith(dns_resource_key_name(t->key), rr->rrsig.signer); |
| 2115 | if (r < 0) |
| 2116 | return r; |
| 2117 | if (r == 0) |
| 2118 | continue; |
| 2119 | |
| 2120 | dnskey = dns_resource_key_new(rr->key->class, DNS_TYPE_DNSKEY, rr->rrsig.signer); |
| 2121 | if (!dnskey) |
| 2122 | return -ENOMEM12; |
| 2123 | |
| 2124 | log_debug("Requesting DNSKEY to validate transaction %" PRIu16" (%s, RRSIG with key tag: %" PRIu16 ").",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2125, __func__ , "Requesting DNSKEY to validate transaction %" "u"" (%s, RRSIG with key tag: %" "u" ").", t->id, dns_resource_key_name(rr->key), rr-> rrsig.key_tag) : -abs(_e); }) |
| 2125 | t->id, dns_resource_key_name(rr->key), rr->rrsig.key_tag)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2125, __func__ , "Requesting DNSKEY to validate transaction %" "u"" (%s, RRSIG with key tag: %" "u" ").", t->id, dns_resource_key_name(rr->key), rr-> rrsig.key_tag) : -abs(_e); }); |
| 2126 | r = dns_transaction_request_dnssec_rr(t, dnskey); |
| 2127 | if (r < 0) |
| 2128 | return r; |
| 2129 | break; |
| 2130 | } |
| 2131 | |
| 2132 | case DNS_TYPE_DNSKEY: { |
| 2133 | /* For each DNSKEY we request the matching DS */ |
| 2134 | _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *ds = NULL((void*)0); |
| 2135 | |
| 2136 | /* If the DNSKEY we are looking at is not for |
| 2137 | * zone we are interested in, nor any of its |
| 2138 | * parents, we aren't interested, and don't |
| 2139 | * request it. After all, we don't want to end |
| 2140 | * up in request loops, and want to keep |
| 2141 | * additional traffic down. */ |
| 2142 | |
| 2143 | r = dns_name_endswith(dns_resource_key_name(t->key), dns_resource_key_name(rr->key)); |
| 2144 | if (r < 0) |
| 2145 | return r; |
| 2146 | if (r == 0) |
| 2147 | continue; |
| 2148 | |
| 2149 | ds = dns_resource_key_new(rr->key->class, DNS_TYPE_DS, dns_resource_key_name(rr->key)); |
| 2150 | if (!ds) |
| 2151 | return -ENOMEM12; |
| 2152 | |
| 2153 | log_debug("Requesting DS to validate transaction %" PRIu16" (%s, DNSKEY with key tag: %" PRIu16 ").",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2154, __func__ , "Requesting DS to validate transaction %" "u"" (%s, DNSKEY with key tag: %" "u" ").", t->id, dns_resource_key_name(rr->key), dnssec_keytag (rr, 0)) : -abs(_e); }) |
| 2154 | t->id, dns_resource_key_name(rr->key), dnssec_keytag(rr, false))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2154, __func__ , "Requesting DS to validate transaction %" "u"" (%s, DNSKEY with key tag: %" "u" ").", t->id, dns_resource_key_name(rr->key), dnssec_keytag (rr, 0)) : -abs(_e); }); |
| 2155 | r = dns_transaction_request_dnssec_rr(t, ds); |
| 2156 | if (r < 0) |
| 2157 | return r; |
| 2158 | |
| 2159 | break; |
| 2160 | } |
| 2161 | |
| 2162 | case DNS_TYPE_SOA: |
| 2163 | case DNS_TYPE_NS: { |
| 2164 | _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *ds = NULL((void*)0); |
| 2165 | |
| 2166 | /* For an unsigned SOA or NS, try to acquire |
| 2167 | * the matching DS RR, as we are at a zone cut |
| 2168 | * then, and whether a DS exists tells us |
| 2169 | * whether the zone is signed. Do so only if |
| 2170 | * this RR matches our original question, |
| 2171 | * however. */ |
| 2172 | |
| 2173 | r = dns_resource_key_match_rr(t->key, rr, NULL((void*)0)); |
| 2174 | if (r < 0) |
| 2175 | return r; |
| 2176 | if (r == 0) { |
| 2177 | /* Hmm, so this SOA RR doesn't match our original question. In this case, maybe this is |
| 2178 | * a negative reply, and we need the a SOA RR's TTL in order to cache a negative entry? |
| 2179 | * If so, we need to validate it, too. */ |
| 2180 | |
| 2181 | r = dns_answer_match_key(t->answer, t->key, NULL((void*)0)); |
| 2182 | if (r < 0) |
| 2183 | return r; |
| 2184 | if (r > 0) /* positive reply, we won't need the SOA and hence don't need to validate |
| 2185 | * it. */ |
| 2186 | continue; |
| 2187 | } |
| 2188 | |
| 2189 | r = dnssec_has_rrsig(t->answer, rr->key); |
| 2190 | if (r < 0) |
| 2191 | return r; |
| 2192 | if (r > 0) |
| 2193 | continue; |
| 2194 | |
| 2195 | ds = dns_resource_key_new(rr->key->class, DNS_TYPE_DS, dns_resource_key_name(rr->key)); |
| 2196 | if (!ds) |
| 2197 | return -ENOMEM12; |
| 2198 | |
| 2199 | log_debug("Requesting DS to validate transaction %" PRIu16 " (%s, unsigned SOA/NS RRset).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2200, __func__ , "Requesting DS to validate transaction %" "u" " (%s, unsigned SOA/NS RRset)." , t->id, dns_resource_key_name(rr->key)) : -abs(_e); }) |
| 2200 | t->id, dns_resource_key_name(rr->key))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2200, __func__ , "Requesting DS to validate transaction %" "u" " (%s, unsigned SOA/NS RRset)." , t->id, dns_resource_key_name(rr->key)) : -abs(_e); }); |
| 2201 | r = dns_transaction_request_dnssec_rr(t, ds); |
| 2202 | if (r < 0) |
| 2203 | return r; |
| 2204 | |
| 2205 | break; |
| 2206 | } |
| 2207 | |
| 2208 | case DNS_TYPE_DS: |
| 2209 | case DNS_TYPE_CNAME: |
| 2210 | case DNS_TYPE_DNAME: { |
| 2211 | _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *soa = NULL((void*)0); |
| 2212 | const char *name; |
| 2213 | |
| 2214 | /* CNAMEs and DNAMEs cannot be located at a |
| 2215 | * zone apex, hence ask for the parent SOA for |
| 2216 | * unsigned CNAME/DNAME RRs, maybe that's the |
| 2217 | * apex. But do all that only if this is |
| 2218 | * actually a response to our original |
| 2219 | * question. |
| 2220 | * |
| 2221 | * Similar for DS RRs, which are signed when |
| 2222 | * the parent SOA is signed. */ |
| 2223 | |
| 2224 | r = dns_transaction_is_primary_response(t, rr); |
| 2225 | if (r < 0) |
| 2226 | return r; |
| 2227 | if (r == 0) |
| 2228 | continue; |
| 2229 | |
| 2230 | r = dnssec_has_rrsig(t->answer, rr->key); |
| 2231 | if (r < 0) |
| 2232 | return r; |
| 2233 | if (r > 0) |
| 2234 | continue; |
| 2235 | |
| 2236 | r = dns_answer_has_dname_for_cname(t->answer, rr); |
| 2237 | if (r < 0) |
| 2238 | return r; |
| 2239 | if (r > 0) |
| 2240 | continue; |
| 2241 | |
| 2242 | name = dns_resource_key_name(rr->key); |
| 2243 | r = dns_name_parent(&name); |
| 2244 | if (r < 0) |
| 2245 | return r; |
| 2246 | if (r == 0) |
| 2247 | continue; |
| 2248 | |
| 2249 | soa = dns_resource_key_new(rr->key->class, DNS_TYPE_SOA, name); |
| 2250 | if (!soa) |
| 2251 | return -ENOMEM12; |
| 2252 | |
| 2253 | log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned CNAME/DNAME/DS RRset).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2254, __func__ , "Requesting parent SOA to validate transaction %" "u" " (%s, unsigned CNAME/DNAME/DS RRset)." , t->id, dns_resource_key_name(rr->key)) : -abs(_e); }) |
| 2254 | t->id, dns_resource_key_name(rr->key))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2254, __func__ , "Requesting parent SOA to validate transaction %" "u" " (%s, unsigned CNAME/DNAME/DS RRset)." , t->id, dns_resource_key_name(rr->key)) : -abs(_e); }); |
| 2255 | r = dns_transaction_request_dnssec_rr(t, soa); |
| 2256 | if (r < 0) |
| 2257 | return r; |
| 2258 | |
| 2259 | break; |
| 2260 | } |
| 2261 | |
| 2262 | default: { |
| 2263 | _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *soa = NULL((void*)0); |
| 2264 | |
| 2265 | /* For other unsigned RRsets (including |
| 2266 | * NSEC/NSEC3!), look for proof the zone is |
| 2267 | * unsigned, by requesting the SOA RR of the |
| 2268 | * zone. However, do so only if they are |
| 2269 | * directly relevant to our original |
| 2270 | * question. */ |
| 2271 | |
| 2272 | r = dns_transaction_is_primary_response(t, rr); |
| 2273 | if (r < 0) |
| 2274 | return r; |
| 2275 | if (r == 0) |
| 2276 | continue; |
| 2277 | |
| 2278 | r = dnssec_has_rrsig(t->answer, rr->key); |
| 2279 | if (r < 0) |
| 2280 | return r; |
| 2281 | if (r > 0) |
| 2282 | continue; |
| 2283 | |
| 2284 | soa = dns_resource_key_new(rr->key->class, DNS_TYPE_SOA, dns_resource_key_name(rr->key)); |
| 2285 | if (!soa) |
| 2286 | return -ENOMEM12; |
| 2287 | |
| 2288 | log_debug("Requesting SOA to validate transaction %" PRIu16 " (%s, unsigned non-SOA/NS RRset <%s>).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2289, __func__ , "Requesting SOA to validate transaction %" "u" " (%s, unsigned non-SOA/NS RRset <%s>)." , t->id, dns_resource_key_name(rr->key), dns_resource_record_to_string (rr)) : -abs(_e); }) |
| 2289 | t->id, dns_resource_key_name(rr->key), dns_resource_record_to_string(rr))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2289, __func__ , "Requesting SOA to validate transaction %" "u" " (%s, unsigned non-SOA/NS RRset <%s>)." , t->id, dns_resource_key_name(rr->key), dns_resource_record_to_string (rr)) : -abs(_e); }); |
| 2290 | r = dns_transaction_request_dnssec_rr(t, soa); |
| 2291 | if (r < 0) |
| 2292 | return r; |
| 2293 | break; |
| 2294 | }} |
| 2295 | } |
| 2296 | |
| 2297 | /* Above, we requested everything necessary to validate what |
| 2298 | * we got. Now, let's request what we need to validate what we |
| 2299 | * didn't get... */ |
| 2300 | |
| 2301 | r = dns_transaction_has_unsigned_negative_answer(t); |
| 2302 | if (r < 0) |
| 2303 | return r; |
| 2304 | if (r > 0) { |
| 2305 | const char *name; |
| 2306 | uint16_t type = 0; |
| 2307 | |
| 2308 | name = dns_resource_key_name(t->key); |
| 2309 | |
| 2310 | /* If this was a SOA or NS request, then check if there's a DS RR for the same domain. Note that this |
| 2311 | * could also be used as indication that we are not at a zone apex, but in real world setups there are |
| 2312 | * too many broken DNS servers (Hello, incapdns.net!) where non-terminal zones return NXDOMAIN even |
| 2313 | * though they have further children. If this was a DS request, then it's signed when the parent zone |
| 2314 | * is signed, hence ask the parent SOA in that case. If this was any other RR then ask for the SOA RR, |
| 2315 | * to see if that is signed. */ |
| 2316 | |
| 2317 | if (t->key->type == DNS_TYPE_DS) { |
| 2318 | r = dns_name_parent(&name); |
| 2319 | if (r > 0) { |
| 2320 | type = DNS_TYPE_SOA; |
| 2321 | log_debug("Requesting parent SOA to validate transaction %" PRIu16 " (%s, unsigned empty DS response).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2322, __func__ , "Requesting parent SOA to validate transaction %" "u" " (%s, unsigned empty DS response)." , t->id, dns_resource_key_name(t->key)) : -abs(_e); }) |
| 2322 | t->id, dns_resource_key_name(t->key))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2322, __func__ , "Requesting parent SOA to validate transaction %" "u" " (%s, unsigned empty DS response)." , t->id, dns_resource_key_name(t->key)) : -abs(_e); }); |
| 2323 | } else |
| 2324 | name = NULL((void*)0); |
| 2325 | |
| 2326 | } else if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_TYPE_SOA, DNS_TYPE_NS})/sizeof(int)] ; switch(t->key->type) { case DNS_TYPE_SOA: case DNS_TYPE_NS : _found = 1; break; default: break; } _found; })) { |
| 2327 | |
| 2328 | type = DNS_TYPE_DS; |
| 2329 | log_debug("Requesting DS to validate transaction %" PRIu16 " (%s, unsigned empty SOA/NS response).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2330, __func__ , "Requesting DS to validate transaction %" "u" " (%s, unsigned empty SOA/NS response)." , t->id, dns_resource_key_name(t->key)) : -abs(_e); }) |
| 2330 | t->id, dns_resource_key_name(t->key))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2330, __func__ , "Requesting DS to validate transaction %" "u" " (%s, unsigned empty SOA/NS response)." , t->id, dns_resource_key_name(t->key)) : -abs(_e); }); |
| 2331 | |
| 2332 | } else { |
| 2333 | type = DNS_TYPE_SOA; |
| 2334 | log_debug("Requesting SOA to validate transaction %" PRIu16 " (%s, unsigned empty non-SOA/NS/DS response).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2335, __func__ , "Requesting SOA to validate transaction %" "u" " (%s, unsigned empty non-SOA/NS/DS response)." , t->id, dns_resource_key_name(t->key)) : -abs(_e); }) |
| 2335 | t->id, dns_resource_key_name(t->key))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2335, __func__ , "Requesting SOA to validate transaction %" "u" " (%s, unsigned empty non-SOA/NS/DS response)." , t->id, dns_resource_key_name(t->key)) : -abs(_e); }); |
| 2336 | } |
| 2337 | |
| 2338 | if (name) { |
| 2339 | _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *soa = NULL((void*)0); |
| 2340 | |
| 2341 | soa = dns_resource_key_new(t->key->class, type, name); |
| 2342 | if (!soa) |
| 2343 | return -ENOMEM12; |
| 2344 | |
| 2345 | r = dns_transaction_request_dnssec_rr(t, soa); |
| 2346 | if (r < 0) |
| 2347 | return r; |
| 2348 | } |
| 2349 | } |
| 2350 | |
| 2351 | return dns_transaction_dnssec_is_live(t); |
| 2352 | } |
| 2353 | |
| 2354 | void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source) { |
| 2355 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2355, __PRETTY_FUNCTION__); } while (0); |
| 2356 | assert(source)do { if ((__builtin_expect(!!(!(source)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("source"), "../src/resolve/resolved-dns-transaction.c" , 2356, __PRETTY_FUNCTION__); } while (0); |
| 2357 | |
| 2358 | /* Invoked whenever any of our auxiliary DNSSEC transactions completed its work. If the state is still PENDING, |
| 2359 | we are still in the loop that adds further DNSSEC transactions, hence don't check if we are ready yet. If |
| 2360 | the state is VALIDATING however, we should check if we are complete now. */ |
| 2361 | |
| 2362 | if (t->state == DNS_TRANSACTION_VALIDATING) |
| 2363 | dns_transaction_process_dnssec(t); |
| 2364 | } |
| 2365 | |
| 2366 | static int dns_transaction_validate_dnskey_by_ds(DnsTransaction *t) { |
| 2367 | DnsResourceRecord *rr; |
| 2368 | int ifindex, r; |
| 2369 | |
| 2370 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2370, __PRETTY_FUNCTION__); } while (0); |
| 2371 | |
| 2372 | /* Add all DNSKEY RRs from the answer that are validated by DS |
| 2373 | * RRs from the list of validated keys to the list of |
| 2374 | * validated keys. */ |
| 2375 | |
| 2376 | DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, t->answer)for (size_t __unique_prefix_i22 = ({ (rr) = ((t->answer) && (t->answer)->n_rrs > 0) ? (t->answer)->items[ 0].rr : ((void*)0); (ifindex) = ((t->answer) && (t ->answer)->n_rrs > 0) ? (t->answer)->items[0]. ifindex : 0; 0; }); (t->answer) && (__unique_prefix_i22 < (t->answer)->n_rrs); __unique_prefix_i22++, (rr) = ((__unique_prefix_i22 < (t->answer)->n_rrs) ? (t-> answer)->items[__unique_prefix_i22].rr : ((void*)0)), (ifindex ) = ((__unique_prefix_i22 < (t->answer)->n_rrs) ? (t ->answer)->items[__unique_prefix_i22].ifindex : 0)) { |
| 2377 | |
| 2378 | r = dnssec_verify_dnskey_by_ds_search(rr, t->validated_keys); |
| 2379 | if (r < 0) |
| 2380 | return r; |
| 2381 | if (r == 0) |
| 2382 | continue; |
| 2383 | |
| 2384 | /* If so, the DNSKEY is validated too. */ |
| 2385 | r = dns_answer_add_extend(&t->validated_keys, rr, ifindex, DNS_ANSWER_AUTHENTICATED); |
| 2386 | if (r < 0) |
| 2387 | return r; |
| 2388 | } |
| 2389 | |
| 2390 | return 0; |
| 2391 | } |
| 2392 | |
| 2393 | static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *rr) { |
| 2394 | int r; |
| 2395 | |
| 2396 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2396, __PRETTY_FUNCTION__); } while (0); |
| 2397 | assert(rr)do { if ((__builtin_expect(!!(!(rr)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("rr"), "../src/resolve/resolved-dns-transaction.c" , 2397, __PRETTY_FUNCTION__); } while (0); |
| 2398 | |
| 2399 | /* Checks if the RR we are looking for must be signed with an |
| 2400 | * RRSIG. This is used for positive responses. */ |
| 2401 | |
| 2402 | if (t->scope->dnssec_mode == DNSSEC_NO) |
| 2403 | return false0; |
| 2404 | |
| 2405 | if (dns_type_is_pseudo(rr->key->type)) |
| 2406 | return -EINVAL22; |
| 2407 | |
| 2408 | r = dns_transaction_negative_trust_anchor_lookup(t, dns_resource_key_name(rr->key)); |
| 2409 | if (r < 0) |
| 2410 | return r; |
| 2411 | if (r > 0) |
| 2412 | return false0; |
| 2413 | |
| 2414 | switch (rr->key->type) { |
| 2415 | |
| 2416 | case DNS_TYPE_RRSIG: |
| 2417 | /* RRSIGs are the signatures themselves, they need no signing. */ |
| 2418 | return false0; |
| 2419 | |
| 2420 | case DNS_TYPE_SOA: |
| 2421 | case DNS_TYPE_NS: { |
| 2422 | DnsTransaction *dt; |
| 2423 | Iterator i; |
| 2424 | |
| 2425 | /* For SOA or NS RRs we look for a matching DS transaction */ |
| 2426 | |
| 2427 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2428 | |
| 2429 | if (dt->key->class != rr->key->class) |
| 2430 | continue; |
| 2431 | if (dt->key->type != DNS_TYPE_DS) |
| 2432 | continue; |
| 2433 | |
| 2434 | r = dns_name_equal(dns_resource_key_name(dt->key), dns_resource_key_name(rr->key)); |
| 2435 | if (r < 0) |
| 2436 | return r; |
| 2437 | if (r == 0) |
| 2438 | continue; |
| 2439 | |
| 2440 | /* We found a DS transactions for the SOA/NS |
| 2441 | * RRs we are looking at. If it discovered signed DS |
| 2442 | * RRs, then we need to be signed, too. */ |
| 2443 | |
| 2444 | if (!dt->answer_authenticated) |
| 2445 | return false0; |
| 2446 | |
| 2447 | return dns_answer_match_key(dt->answer, dt->key, NULL((void*)0)); |
| 2448 | } |
| 2449 | |
| 2450 | /* We found nothing that proves this is safe to leave |
| 2451 | * this unauthenticated, hence ask inist on |
| 2452 | * authentication. */ |
| 2453 | return true1; |
| 2454 | } |
| 2455 | |
| 2456 | case DNS_TYPE_DS: |
| 2457 | case DNS_TYPE_CNAME: |
| 2458 | case DNS_TYPE_DNAME: { |
| 2459 | const char *parent = NULL((void*)0); |
| 2460 | DnsTransaction *dt; |
| 2461 | Iterator i; |
| 2462 | |
| 2463 | /* |
| 2464 | * CNAME/DNAME RRs cannot be located at a zone apex, hence look directly for the parent SOA. |
| 2465 | * |
| 2466 | * DS RRs are signed if the parent is signed, hence also look at the parent SOA |
| 2467 | */ |
| 2468 | |
| 2469 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2470 | |
| 2471 | if (dt->key->class != rr->key->class) |
| 2472 | continue; |
| 2473 | if (dt->key->type != DNS_TYPE_SOA) |
| 2474 | continue; |
| 2475 | |
| 2476 | if (!parent) { |
| 2477 | parent = dns_resource_key_name(rr->key); |
| 2478 | r = dns_name_parent(&parent); |
| 2479 | if (r < 0) |
| 2480 | return r; |
| 2481 | if (r == 0) { |
| 2482 | if (rr->key->type == DNS_TYPE_DS) |
| 2483 | return true1; |
| 2484 | |
| 2485 | /* A CNAME/DNAME without a parent? That's sooo weird. */ |
| 2486 | log_debug("Transaction %" PRIu16 " claims CNAME/DNAME at root. Refusing.", t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2486, __func__ , "Transaction %" "u" " claims CNAME/DNAME at root. Refusing." , t->id) : -abs(_e); }); |
| 2487 | return -EBADMSG74; |
| 2488 | } |
| 2489 | } |
| 2490 | |
| 2491 | r = dns_name_equal(dns_resource_key_name(dt->key), parent); |
| 2492 | if (r < 0) |
| 2493 | return r; |
| 2494 | if (r == 0) |
| 2495 | continue; |
| 2496 | |
| 2497 | return t->answer_authenticated; |
| 2498 | } |
| 2499 | |
| 2500 | return true1; |
| 2501 | } |
| 2502 | |
| 2503 | default: { |
| 2504 | DnsTransaction *dt; |
| 2505 | Iterator i; |
| 2506 | |
| 2507 | /* Any other kind of RR (including DNSKEY/NSEC/NSEC3). Let's see if our SOA lookup was authenticated */ |
| 2508 | |
| 2509 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2510 | |
| 2511 | if (dt->key->class != rr->key->class) |
| 2512 | continue; |
| 2513 | if (dt->key->type != DNS_TYPE_SOA) |
| 2514 | continue; |
| 2515 | |
| 2516 | r = dns_name_equal(dns_resource_key_name(dt->key), dns_resource_key_name(rr->key)); |
| 2517 | if (r < 0) |
| 2518 | return r; |
| 2519 | if (r == 0) |
| 2520 | continue; |
| 2521 | |
| 2522 | /* We found the transaction that was supposed to find |
| 2523 | * the SOA RR for us. It was successful, but found no |
| 2524 | * RR for us. This means we are not at a zone cut. In |
| 2525 | * this case, we require authentication if the SOA |
| 2526 | * lookup was authenticated too. */ |
| 2527 | return t->answer_authenticated; |
| 2528 | } |
| 2529 | |
| 2530 | return true1; |
| 2531 | }} |
| 2532 | } |
| 2533 | |
| 2534 | static int dns_transaction_in_private_tld(DnsTransaction *t, const DnsResourceKey *key) { |
| 2535 | DnsTransaction *dt; |
| 2536 | const char *tld; |
| 2537 | Iterator i; |
| 2538 | int r; |
| 2539 | |
| 2540 | /* If DNSSEC downgrade mode is on, checks whether the |
| 2541 | * specified RR is one level below a TLD we have proven not to |
| 2542 | * exist. In such a case we assume that this is a private |
| 2543 | * domain, and permit it. |
| 2544 | * |
| 2545 | * This detects cases like the Fritz!Box router networks. Each |
| 2546 | * Fritz!Box router serves a private "fritz.box" zone, in the |
| 2547 | * non-existing TLD "box". Requests for the "fritz.box" domain |
| 2548 | * are served by the router itself, while requests for the |
| 2549 | * "box" domain will result in NXDOMAIN. |
| 2550 | * |
| 2551 | * Note that this logic is unable to detect cases where a |
| 2552 | * router serves a private DNS zone directly under |
| 2553 | * non-existing TLD. In such a case we cannot detect whether |
| 2554 | * the TLD is supposed to exist or not, as all requests we |
| 2555 | * make for it will be answered by the router's zone, and not |
| 2556 | * by the root zone. */ |
| 2557 | |
| 2558 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2558, __PRETTY_FUNCTION__); } while (0); |
| 2559 | |
| 2560 | if (t->scope->dnssec_mode != DNSSEC_ALLOW_DOWNGRADE) |
| 2561 | return false0; /* In strict DNSSEC mode what doesn't exist, doesn't exist */ |
| 2562 | |
| 2563 | tld = dns_resource_key_name(key); |
| 2564 | r = dns_name_parent(&tld); |
| 2565 | if (r < 0) |
| 2566 | return r; |
| 2567 | if (r == 0) |
| 2568 | return false0; /* Already the root domain */ |
| 2569 | |
| 2570 | if (!dns_name_is_single_label(tld)) |
| 2571 | return false0; |
| 2572 | |
| 2573 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2574 | |
| 2575 | if (dt->key->class != key->class) |
| 2576 | continue; |
| 2577 | |
| 2578 | r = dns_name_equal(dns_resource_key_name(dt->key), tld); |
| 2579 | if (r < 0) |
| 2580 | return r; |
| 2581 | if (r == 0) |
| 2582 | continue; |
| 2583 | |
| 2584 | /* We found an auxiliary lookup we did for the TLD. If |
| 2585 | * that returned with NXDOMAIN, we know the TLD didn't |
| 2586 | * exist, and hence this might be a private zone. */ |
| 2587 | |
| 2588 | return dt->answer_rcode == DNS_RCODE_NXDOMAIN; |
| 2589 | } |
| 2590 | |
| 2591 | return false0; |
| 2592 | } |
| 2593 | |
| 2594 | static int dns_transaction_requires_nsec(DnsTransaction *t) { |
| 2595 | char key_str[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 2596 | DnsTransaction *dt; |
| 2597 | const char *name; |
| 2598 | uint16_t type = 0; |
| 2599 | Iterator i; |
| 2600 | int r; |
| 2601 | |
| 2602 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2602, __PRETTY_FUNCTION__); } while (0); |
| 2603 | |
| 2604 | /* Checks if we need to insist on NSEC/NSEC3 RRs for proving |
| 2605 | * this negative reply */ |
| 2606 | |
| 2607 | if (t->scope->dnssec_mode == DNSSEC_NO) |
| 2608 | return false0; |
| 2609 | |
| 2610 | if (dns_type_is_pseudo(t->key->type)) |
| 2611 | return -EINVAL22; |
| 2612 | |
| 2613 | r = dns_transaction_negative_trust_anchor_lookup(t, dns_resource_key_name(t->key)); |
| 2614 | if (r < 0) |
| 2615 | return r; |
| 2616 | if (r > 0) |
| 2617 | return false0; |
| 2618 | |
| 2619 | r = dns_transaction_in_private_tld(t, t->key); |
| 2620 | if (r < 0) |
| 2621 | return r; |
| 2622 | if (r > 0) { |
| 2623 | /* The lookup is from a TLD that is proven not to |
| 2624 | * exist, and we are in downgrade mode, hence ignore |
| 2625 | * that fact that we didn't get any NSEC RRs. */ |
| 2626 | |
| 2627 | log_info("Detected a negative query %s in a private DNS zone, permitting unsigned response.",({ int _level = (((6))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2628, __func__ , "Detected a negative query %s in a private DNS zone, permitting unsigned response." , dns_resource_key_to_string(t->key, key_str, sizeof key_str )) : -abs(_e); }) |
| 2628 | dns_resource_key_to_string(t->key, key_str, sizeof key_str))({ int _level = (((6))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2628, __func__ , "Detected a negative query %s in a private DNS zone, permitting unsigned response." , dns_resource_key_to_string(t->key, key_str, sizeof key_str )) : -abs(_e); }); |
| 2629 | return false0; |
| 2630 | } |
| 2631 | |
| 2632 | name = dns_resource_key_name(t->key); |
| 2633 | |
| 2634 | if (t->key->type == DNS_TYPE_DS) { |
| 2635 | |
| 2636 | /* We got a negative reply for this DS lookup? DS RRs are signed when their parent zone is signed, |
| 2637 | * hence check the parent SOA in this case. */ |
| 2638 | |
| 2639 | r = dns_name_parent(&name); |
| 2640 | if (r < 0) |
| 2641 | return r; |
| 2642 | if (r == 0) |
| 2643 | return true1; |
| 2644 | |
| 2645 | type = DNS_TYPE_SOA; |
| 2646 | |
| 2647 | } else if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_TYPE_SOA, DNS_TYPE_NS})/sizeof(int)] ; switch(t->key->type) { case DNS_TYPE_SOA: case DNS_TYPE_NS : _found = 1; break; default: break; } _found; })) |
| 2648 | /* We got a negative reply for this SOA/NS lookup? If so, check if there's a DS RR for this */ |
| 2649 | type = DNS_TYPE_DS; |
| 2650 | else |
| 2651 | /* For all other negative replies, check for the SOA lookup */ |
| 2652 | type = DNS_TYPE_SOA; |
| 2653 | |
| 2654 | /* For all other RRs we check the SOA on the same level to see |
| 2655 | * if it's signed. */ |
| 2656 | |
| 2657 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2658 | |
| 2659 | if (dt->key->class != t->key->class) |
| 2660 | continue; |
| 2661 | if (dt->key->type != type) |
| 2662 | continue; |
| 2663 | |
| 2664 | r = dns_name_equal(dns_resource_key_name(dt->key), name); |
| 2665 | if (r < 0) |
| 2666 | return r; |
| 2667 | if (r == 0) |
| 2668 | continue; |
| 2669 | |
| 2670 | return dt->answer_authenticated; |
| 2671 | } |
| 2672 | |
| 2673 | /* If in doubt, require NSEC/NSEC3 */ |
| 2674 | return true1; |
| 2675 | } |
| 2676 | |
| 2677 | static int dns_transaction_dnskey_authenticated(DnsTransaction *t, DnsResourceRecord *rr) { |
| 2678 | DnsResourceRecord *rrsig; |
| 2679 | bool_Bool found = false0; |
| 2680 | int r; |
| 2681 | |
| 2682 | /* Checks whether any of the DNSKEYs used for the RRSIGs for |
| 2683 | * the specified RRset is authenticated (i.e. has a matching |
| 2684 | * DS RR). */ |
| 2685 | |
| 2686 | r = dns_transaction_negative_trust_anchor_lookup(t, dns_resource_key_name(rr->key)); |
| 2687 | if (r < 0) |
| 2688 | return r; |
| 2689 | if (r > 0) |
| 2690 | return false0; |
| 2691 | |
| 2692 | DNS_ANSWER_FOREACH(rrsig, t->answer)for (size_t __unique_prefix_i23 = ({ (rrsig) = ((t->answer ) && (t->answer)->n_rrs > 0) ? (t->answer )->items[0].rr : ((void*)0); 0; }); (t->answer) && (__unique_prefix_i23 < (t->answer)->n_rrs); __unique_prefix_i23 ++, (rrsig) = (__unique_prefix_i23 < (t->answer)->n_rrs ? (t->answer)->items[__unique_prefix_i23].rr : ((void* )0))) { |
| 2693 | DnsTransaction *dt; |
| 2694 | Iterator i; |
| 2695 | |
| 2696 | r = dnssec_key_match_rrsig(rr->key, rrsig); |
| 2697 | if (r < 0) |
| 2698 | return r; |
| 2699 | if (r == 0) |
| 2700 | continue; |
| 2701 | |
| 2702 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2703 | |
| 2704 | if (dt->key->class != rr->key->class) |
| 2705 | continue; |
| 2706 | |
| 2707 | if (dt->key->type == DNS_TYPE_DNSKEY) { |
| 2708 | |
| 2709 | r = dns_name_equal(dns_resource_key_name(dt->key), rrsig->rrsig.signer); |
| 2710 | if (r < 0) |
| 2711 | return r; |
| 2712 | if (r == 0) |
| 2713 | continue; |
| 2714 | |
| 2715 | /* OK, we found an auxiliary DNSKEY |
| 2716 | * lookup. If that lookup is |
| 2717 | * authenticated, report this. */ |
| 2718 | |
| 2719 | if (dt->answer_authenticated) |
| 2720 | return true1; |
| 2721 | |
| 2722 | found = true1; |
| 2723 | |
| 2724 | } else if (dt->key->type == DNS_TYPE_DS) { |
| 2725 | |
| 2726 | r = dns_name_equal(dns_resource_key_name(dt->key), rrsig->rrsig.signer); |
| 2727 | if (r < 0) |
| 2728 | return r; |
| 2729 | if (r == 0) |
| 2730 | continue; |
| 2731 | |
| 2732 | /* OK, we found an auxiliary DS |
| 2733 | * lookup. If that lookup is |
| 2734 | * authenticated and non-zero, we |
| 2735 | * won! */ |
| 2736 | |
| 2737 | if (!dt->answer_authenticated) |
| 2738 | return false0; |
| 2739 | |
| 2740 | return dns_answer_match_key(dt->answer, dt->key, NULL((void*)0)); |
| 2741 | } |
| 2742 | } |
| 2743 | } |
| 2744 | |
| 2745 | return found ? false0 : -ENXIO6; |
| 2746 | } |
| 2747 | |
| 2748 | static int dns_transaction_known_signed(DnsTransaction *t, DnsResourceRecord *rr) { |
| 2749 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2749, __PRETTY_FUNCTION__); } while (0); |
| 2750 | assert(rr)do { if ((__builtin_expect(!!(!(rr)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("rr"), "../src/resolve/resolved-dns-transaction.c" , 2750, __PRETTY_FUNCTION__); } while (0); |
| 2751 | |
| 2752 | /* We know that the root domain is signed, hence if it appears |
| 2753 | * not to be signed, there's a problem with the DNS server */ |
| 2754 | |
| 2755 | return rr->key->class == DNS_CLASS_IN && |
| 2756 | dns_name_is_root(dns_resource_key_name(rr->key)); |
| 2757 | } |
| 2758 | |
| 2759 | static int dns_transaction_check_revoked_trust_anchors(DnsTransaction *t) { |
| 2760 | DnsResourceRecord *rr; |
| 2761 | int r; |
| 2762 | |
| 2763 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2763, __PRETTY_FUNCTION__); } while (0); |
| 2764 | |
| 2765 | /* Maybe warn the user that we encountered a revoked DNSKEY |
| 2766 | * for a key from our trust anchor. Note that we don't care |
| 2767 | * whether the DNSKEY can be authenticated or not. It's |
| 2768 | * sufficient if it is self-signed. */ |
| 2769 | |
| 2770 | DNS_ANSWER_FOREACH(rr, t->answer)for (size_t __unique_prefix_i24 = ({ (rr) = ((t->answer) && (t->answer)->n_rrs > 0) ? (t->answer)->items[ 0].rr : ((void*)0); 0; }); (t->answer) && (__unique_prefix_i24 < (t->answer)->n_rrs); __unique_prefix_i24++, (rr) = (__unique_prefix_i24 < (t->answer)->n_rrs ? (t-> answer)->items[__unique_prefix_i24].rr : ((void*)0))) { |
| 2771 | r = dns_trust_anchor_check_revoked(&t->scope->manager->trust_anchor, rr, t->answer); |
| 2772 | if (r < 0) |
| 2773 | return r; |
| 2774 | } |
| 2775 | |
| 2776 | return 0; |
| 2777 | } |
| 2778 | |
| 2779 | static int dns_transaction_invalidate_revoked_keys(DnsTransaction *t) { |
| 2780 | bool_Bool changed; |
| 2781 | int r; |
| 2782 | |
| 2783 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2783, __PRETTY_FUNCTION__); } while (0); |
| 2784 | |
| 2785 | /* Removes all DNSKEY/DS objects from t->validated_keys that |
| 2786 | * our trust anchors database considers revoked. */ |
| 2787 | |
| 2788 | do { |
| 2789 | DnsResourceRecord *rr; |
| 2790 | |
| 2791 | changed = false0; |
| 2792 | |
| 2793 | DNS_ANSWER_FOREACH(rr, t->validated_keys)for (size_t __unique_prefix_i25 = ({ (rr) = ((t->validated_keys ) && (t->validated_keys)->n_rrs > 0) ? (t-> validated_keys)->items[0].rr : ((void*)0); 0; }); (t->validated_keys ) && (__unique_prefix_i25 < (t->validated_keys) ->n_rrs); __unique_prefix_i25++, (rr) = (__unique_prefix_i25 < (t->validated_keys)->n_rrs ? (t->validated_keys )->items[__unique_prefix_i25].rr : ((void*)0))) { |
| 2794 | r = dns_trust_anchor_is_revoked(&t->scope->manager->trust_anchor, rr); |
| 2795 | if (r < 0) |
| 2796 | return r; |
| 2797 | if (r > 0) { |
| 2798 | r = dns_answer_remove_by_rr(&t->validated_keys, rr); |
| 2799 | if (r < 0) |
| 2800 | return r; |
| 2801 | |
| 2802 | assert(r > 0)do { if ((__builtin_expect(!!(!(r > 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("r > 0"), "../src/resolve/resolved-dns-transaction.c" , 2802, __PRETTY_FUNCTION__); } while (0); |
| 2803 | changed = true1; |
| 2804 | break; |
| 2805 | } |
| 2806 | } |
| 2807 | } while (changed); |
| 2808 | |
| 2809 | return 0; |
| 2810 | } |
| 2811 | |
| 2812 | static int dns_transaction_copy_validated(DnsTransaction *t) { |
| 2813 | DnsTransaction *dt; |
| 2814 | Iterator i; |
| 2815 | int r; |
| 2816 | |
| 2817 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 2817, __PRETTY_FUNCTION__); } while (0); |
| 2818 | |
| 2819 | /* Copy all validated RRs from the auxiliary DNSSEC transactions into our set of validated RRs */ |
| 2820 | |
| 2821 | SET_FOREACH(dt, t->dnssec_transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), . next_key = ((void*)0) }); set_iterate((t->dnssec_transactions ), &(i), (void**)&(dt)); ) { |
| 2822 | |
| 2823 | if (DNS_TRANSACTION_IS_LIVE(dt->state)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING , DNS_TRANSACTION_VALIDATING})/sizeof(int)]; switch((dt->state )) { case DNS_TRANSACTION_NULL: case DNS_TRANSACTION_PENDING: case DNS_TRANSACTION_VALIDATING: _found = 1; break; default: break; } _found; })) |
| 2824 | continue; |
| 2825 | |
| 2826 | if (!dt->answer_authenticated) |
| 2827 | continue; |
| 2828 | |
| 2829 | r = dns_answer_extend(&t->validated_keys, dt->answer); |
| 2830 | if (r < 0) |
| 2831 | return r; |
| 2832 | } |
| 2833 | |
| 2834 | return 0; |
| 2835 | } |
| 2836 | |
| 2837 | typedef enum { |
| 2838 | DNSSEC_PHASE_DNSKEY, /* Phase #1, only validate DNSKEYs */ |
| 2839 | DNSSEC_PHASE_NSEC, /* Phase #2, only validate NSEC+NSEC3 */ |
| 2840 | DNSSEC_PHASE_ALL, /* Phase #3, validate everything else */ |
| 2841 | } Phase; |
| 2842 | |
| 2843 | static int dnssec_validate_records( |
| 2844 | DnsTransaction *t, |
| 2845 | Phase phase, |
| 2846 | bool_Bool *have_nsec, |
| 2847 | DnsAnswer **validated) { |
| 2848 | |
| 2849 | DnsResourceRecord *rr; |
| 2850 | int r; |
| 2851 | |
| 2852 | /* Returns negative on error, 0 if validation failed, 1 to restart validation, 2 when finished. */ |
| 2853 | |
| 2854 | DNS_ANSWER_FOREACH(rr, t->answer)for (size_t __unique_prefix_i26 = ({ (rr) = ((t->answer) && (t->answer)->n_rrs > 0) ? (t->answer)->items[ 0].rr : ((void*)0); 0; }); (t->answer) && (__unique_prefix_i26 < (t->answer)->n_rrs); __unique_prefix_i26++, (rr) = (__unique_prefix_i26 < (t->answer)->n_rrs ? (t-> answer)->items[__unique_prefix_i26].rr : ((void*)0))) { |
| 2855 | DnsResourceRecord *rrsig = NULL((void*)0); |
| 2856 | DnssecResult result; |
| 2857 | |
| 2858 | switch (rr->key->type) { |
| 2859 | case DNS_TYPE_RRSIG: |
| 2860 | continue; |
| 2861 | |
| 2862 | case DNS_TYPE_DNSKEY: |
| 2863 | /* We validate DNSKEYs only in the DNSKEY and ALL phases */ |
| 2864 | if (phase == DNSSEC_PHASE_NSEC) |
| 2865 | continue; |
| 2866 | break; |
| 2867 | |
| 2868 | case DNS_TYPE_NSEC: |
| 2869 | case DNS_TYPE_NSEC3: |
| 2870 | *have_nsec = true1; |
| 2871 | |
| 2872 | /* We validate NSEC/NSEC3 only in the NSEC and ALL phases */ |
| 2873 | if (phase == DNSSEC_PHASE_DNSKEY) |
| 2874 | continue; |
| 2875 | break; |
| 2876 | |
| 2877 | default: |
| 2878 | /* We validate all other RRs only in the ALL phases */ |
| 2879 | if (phase != DNSSEC_PHASE_ALL) |
| 2880 | continue; |
| 2881 | } |
| 2882 | |
| 2883 | r = dnssec_verify_rrset_search(t->answer, rr->key, t->validated_keys, USEC_INFINITY((usec_t) -1), &result, &rrsig); |
| 2884 | if (r < 0) |
| 2885 | return r; |
| 2886 | |
| 2887 | log_debug("Looking at %s: %s", strna(dns_resource_record_to_string(rr)), dnssec_result_to_string(result))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 2887, __func__ , "Looking at %s: %s", strna(dns_resource_record_to_string(rr )), dnssec_result_to_string(result)) : -abs(_e); }); |
| 2888 | |
| 2889 | if (result == DNSSEC_VALIDATED) { |
| 2890 | |
| 2891 | if (rr->key->type == DNS_TYPE_DNSKEY) { |
| 2892 | /* If we just validated a DNSKEY RRset, then let's add these keys to |
| 2893 | * the set of validated keys for this transaction. */ |
| 2894 | |
| 2895 | r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key, DNS_ANSWER_AUTHENTICATED); |
| 2896 | if (r < 0) |
| 2897 | return r; |
| 2898 | |
| 2899 | /* Some of the DNSKEYs we just added might already have been revoked, |
| 2900 | * remove them again in that case. */ |
| 2901 | r = dns_transaction_invalidate_revoked_keys(t); |
| 2902 | if (r < 0) |
| 2903 | return r; |
| 2904 | } |
| 2905 | |
| 2906 | /* Add the validated RRset to the new list of validated |
| 2907 | * RRsets, and remove it from the unvalidated RRsets. |
| 2908 | * We mark the RRset as authenticated and cacheable. */ |
| 2909 | r = dns_answer_move_by_key(validated, &t->answer, rr->key, DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE); |
| 2910 | if (r < 0) |
| 2911 | return r; |
| 2912 | |
| 2913 | manager_dnssec_verdict(t->scope->manager, DNSSEC_SECURE, rr->key); |
| 2914 | |
| 2915 | /* Exit the loop, we dropped something from the answer, start from the beginning */ |
| 2916 | return 1; |
| 2917 | } |
| 2918 | |
| 2919 | /* If we haven't read all DNSKEYs yet a negative result of the validation is irrelevant, as |
| 2920 | * there might be more DNSKEYs coming. Similar, if we haven't read all NSEC/NSEC3 RRs yet, |
| 2921 | * we cannot do positive wildcard proofs yet, as those require the NSEC/NSEC3 RRs. */ |
| 2922 | if (phase != DNSSEC_PHASE_ALL) |
| 2923 | continue; |
| 2924 | |
| 2925 | if (result == DNSSEC_VALIDATED_WILDCARD) { |
| 2926 | bool_Bool authenticated = false0; |
| 2927 | const char *source; |
| 2928 | |
| 2929 | /* This RRset validated, but as a wildcard. This means we need |
| 2930 | * to prove via NSEC/NSEC3 that no matching non-wildcard RR exists. */ |
| 2931 | |
| 2932 | /* First step, determine the source of synthesis */ |
| 2933 | r = dns_resource_record_source(rrsig, &source); |
| 2934 | if (r < 0) |
| 2935 | return r; |
| 2936 | |
| 2937 | r = dnssec_test_positive_wildcard(*validated, |
| 2938 | dns_resource_key_name(rr->key), |
| 2939 | source, |
| 2940 | rrsig->rrsig.signer, |
| 2941 | &authenticated); |
| 2942 | |
| 2943 | /* Unless the NSEC proof showed that the key really doesn't exist something is off. */ |
| 2944 | if (r == 0) |
| 2945 | result = DNSSEC_INVALID; |
| 2946 | else { |
| 2947 | r = dns_answer_move_by_key(validated, &t->answer, rr->key, |
| 2948 | authenticated ? (DNS_ANSWER_AUTHENTICATED|DNS_ANSWER_CACHEABLE) : 0); |
| 2949 | if (r < 0) |
| 2950 | return r; |
| 2951 | |
| 2952 | manager_dnssec_verdict(t->scope->manager, authenticated ? DNSSEC_SECURE : DNSSEC_INSECURE, rr->key); |
| 2953 | |
| 2954 | /* Exit the loop, we dropped something from the answer, start from the beginning */ |
| 2955 | return 1; |
| 2956 | } |
| 2957 | } |
| 2958 | |
| 2959 | if (result == DNSSEC_NO_SIGNATURE) { |
| 2960 | r = dns_transaction_requires_rrsig(t, rr); |
| 2961 | if (r < 0) |
| 2962 | return r; |
| 2963 | if (r == 0) { |
| 2964 | /* Data does not require signing. In that case, just copy it over, |
| 2965 | * but remember that this is by no means authenticated. */ |
| 2966 | r = dns_answer_move_by_key(validated, &t->answer, rr->key, 0); |
| 2967 | if (r < 0) |
| 2968 | return r; |
| 2969 | |
| 2970 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
| 2971 | return 1; |
| 2972 | } |
| 2973 | |
| 2974 | r = dns_transaction_known_signed(t, rr); |
| 2975 | if (r < 0) |
| 2976 | return r; |
| 2977 | if (r > 0) { |
| 2978 | /* This is an RR we know has to be signed. If it isn't this means |
| 2979 | * the server is not attaching RRSIGs, hence complain. */ |
| 2980 | |
| 2981 | dns_server_packet_rrsig_missing(t->server, t->current_feature_level); |
| 2982 | |
| 2983 | if (t->scope->dnssec_mode == DNSSEC_ALLOW_DOWNGRADE) { |
| 2984 | |
| 2985 | /* Downgrading is OK? If so, just consider the information unsigned */ |
| 2986 | |
| 2987 | r = dns_answer_move_by_key(validated, &t->answer, rr->key, 0); |
| 2988 | if (r < 0) |
| 2989 | return r; |
| 2990 | |
| 2991 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
| 2992 | return 1; |
| 2993 | } |
| 2994 | |
| 2995 | /* Otherwise, fail */ |
| 2996 | t->answer_dnssec_result = DNSSEC_INCOMPATIBLE_SERVER; |
| 2997 | return 0; |
| 2998 | } |
| 2999 | |
| 3000 | r = dns_transaction_in_private_tld(t, rr->key); |
| 3001 | if (r < 0) |
| 3002 | return r; |
| 3003 | if (r > 0) { |
| 3004 | char s[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 3005 | |
| 3006 | /* The data is from a TLD that is proven not to exist, and we are in downgrade |
| 3007 | * mode, hence ignore the fact that this was not signed. */ |
| 3008 | |
| 3009 | log_info("Detected RRset %s is in a private DNS zone, permitting unsigned RRs.",({ int _level = (((6))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3010, __func__ , "Detected RRset %s is in a private DNS zone, permitting unsigned RRs." , dns_resource_key_to_string(rr->key, s, sizeof s)) : -abs (_e); }) |
| 3010 | dns_resource_key_to_string(rr->key, s, sizeof s))({ int _level = (((6))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3010, __func__ , "Detected RRset %s is in a private DNS zone, permitting unsigned RRs." , dns_resource_key_to_string(rr->key, s, sizeof s)) : -abs (_e); }); |
| 3011 | |
| 3012 | r = dns_answer_move_by_key(validated, &t->answer, rr->key, 0); |
| 3013 | if (r < 0) |
| 3014 | return r; |
| 3015 | |
| 3016 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
| 3017 | return 1; |
| 3018 | } |
| 3019 | } |
| 3020 | |
| 3021 | if (IN_SET(result,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_MISSING_KEY, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_UNSUPPORTED_ALGORITHM})/sizeof(int)]; switch(result) { case DNSSEC_MISSING_KEY: case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_UNSUPPORTED_ALGORITHM: _found = 1; break; default: break ; } _found; }) |
| 3022 | DNSSEC_MISSING_KEY,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_MISSING_KEY, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_UNSUPPORTED_ALGORITHM})/sizeof(int)]; switch(result) { case DNSSEC_MISSING_KEY: case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_UNSUPPORTED_ALGORITHM: _found = 1; break; default: break ; } _found; }) |
| 3023 | DNSSEC_SIGNATURE_EXPIRED,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_MISSING_KEY, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_UNSUPPORTED_ALGORITHM})/sizeof(int)]; switch(result) { case DNSSEC_MISSING_KEY: case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_UNSUPPORTED_ALGORITHM: _found = 1; break; default: break ; } _found; }) |
| 3024 | DNSSEC_UNSUPPORTED_ALGORITHM)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_MISSING_KEY, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_UNSUPPORTED_ALGORITHM})/sizeof(int)]; switch(result) { case DNSSEC_MISSING_KEY: case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_UNSUPPORTED_ALGORITHM: _found = 1; break; default: break ; } _found; })) { |
| 3025 | |
| 3026 | r = dns_transaction_dnskey_authenticated(t, rr); |
| 3027 | if (r < 0 && r != -ENXIO6) |
| 3028 | return r; |
| 3029 | if (r == 0) { |
| 3030 | /* The DNSKEY transaction was not authenticated, this means there's |
| 3031 | * no DS for this, which means it's OK if no keys are found for this signature. */ |
| 3032 | |
| 3033 | r = dns_answer_move_by_key(validated, &t->answer, rr->key, 0); |
| 3034 | if (r < 0) |
| 3035 | return r; |
| 3036 | |
| 3037 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, rr->key); |
| 3038 | return 1; |
| 3039 | } |
| 3040 | } |
| 3041 | |
| 3042 | r = dns_transaction_is_primary_response(t, rr); |
| 3043 | if (r < 0) |
| 3044 | return r; |
| 3045 | if (r > 0) { |
| 3046 | /* Look for a matching DNAME for this CNAME */ |
| 3047 | r = dns_answer_has_dname_for_cname(t->answer, rr); |
| 3048 | if (r < 0) |
| 3049 | return r; |
| 3050 | if (r == 0) { |
| 3051 | /* Also look among the stuff we already validated */ |
| 3052 | r = dns_answer_has_dname_for_cname(*validated, rr); |
| 3053 | if (r < 0) |
| 3054 | return r; |
| 3055 | } |
| 3056 | |
| 3057 | if (r == 0) { |
| 3058 | if (IN_SET(result,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_INVALID, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_NO_SIGNATURE})/sizeof(int)]; switch(result) { case DNSSEC_INVALID : case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_NO_SIGNATURE: _found = 1; break; default: break; } _found; }) |
| 3059 | DNSSEC_INVALID,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_INVALID, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_NO_SIGNATURE})/sizeof(int)]; switch(result) { case DNSSEC_INVALID : case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_NO_SIGNATURE: _found = 1; break; default: break; } _found; }) |
| 3060 | DNSSEC_SIGNATURE_EXPIRED,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_INVALID, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_NO_SIGNATURE})/sizeof(int)]; switch(result) { case DNSSEC_INVALID : case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_NO_SIGNATURE: _found = 1; break; default: break; } _found; }) |
| 3061 | DNSSEC_NO_SIGNATURE)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNSSEC_INVALID, DNSSEC_SIGNATURE_EXPIRED , DNSSEC_NO_SIGNATURE})/sizeof(int)]; switch(result) { case DNSSEC_INVALID : case DNSSEC_SIGNATURE_EXPIRED: case DNSSEC_NO_SIGNATURE: _found = 1; break; default: break; } _found; })) |
| 3062 | manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, rr->key); |
| 3063 | else /* DNSSEC_MISSING_KEY or DNSSEC_UNSUPPORTED_ALGORITHM */ |
| 3064 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INDETERMINATE, rr->key); |
| 3065 | |
| 3066 | /* This is a primary response to our question, and it failed validation. |
| 3067 | * That's fatal. */ |
| 3068 | t->answer_dnssec_result = result; |
| 3069 | return 0; |
| 3070 | } |
| 3071 | |
| 3072 | /* This is a primary response, but we do have a DNAME RR |
| 3073 | * in the RR that can replay this CNAME, hence rely on |
| 3074 | * that, and we can remove the CNAME in favour of it. */ |
| 3075 | } |
| 3076 | |
| 3077 | /* This is just some auxiliary data. Just remove the RRset and continue. */ |
| 3078 | r = dns_answer_remove_by_key(&t->answer, rr->key); |
| 3079 | if (r < 0) |
| 3080 | return r; |
| 3081 | |
| 3082 | /* We dropped something from the answer, start from the beginning. */ |
| 3083 | return 1; |
| 3084 | } |
| 3085 | |
| 3086 | return 2; /* Finito. */ |
| 3087 | } |
| 3088 | |
| 3089 | int dns_transaction_validate_dnssec(DnsTransaction *t) { |
| 3090 | _cleanup_(dns_answer_unrefp)__attribute__((cleanup(dns_answer_unrefp))) DnsAnswer *validated = NULL((void*)0); |
| 3091 | Phase phase; |
| 3092 | DnsAnswerFlags flags; |
| 3093 | int r; |
| 3094 | char key_str[DNS_RESOURCE_KEY_STRING_MAX((sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof( uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof (uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t) > 8)])))) + (sizeof "CLASS" + (2+(sizeof(uint16_t) <= 1 ? 3 : sizeof(uint16_t) <= 2 ? 5 : sizeof(uint16_t) <= 4 ? 10 : sizeof(uint16_t) <= 8 ? 20 : sizeof(int[-2*(sizeof(uint16_t ) > 8)])))) + 253 + 1)]; |
| 3095 | |
| 3096 | assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-transaction.c" , 3096, __PRETTY_FUNCTION__); } while (0); |
| 3097 | |
| 3098 | /* We have now collected all DS and DNSKEY RRs in |
| 3099 | * t->validated_keys, let's see which RRs we can now |
| 3100 | * authenticate with that. */ |
| 3101 | |
| 3102 | if (t->scope->dnssec_mode == DNSSEC_NO) |
| 3103 | return 0; |
| 3104 | |
| 3105 | /* Already validated */ |
| 3106 | if (t->answer_dnssec_result != _DNSSEC_RESULT_INVALID) |
| 3107 | return 0; |
| 3108 | |
| 3109 | /* Our own stuff needs no validation */ |
| 3110 | if (IN_SET(t->answer_source, DNS_TRANSACTION_ZONE, DNS_TRANSACTION_TRUST_ANCHOR)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){DNS_TRANSACTION_ZONE, DNS_TRANSACTION_TRUST_ANCHOR })/sizeof(int)]; switch(t->answer_source) { case DNS_TRANSACTION_ZONE : case DNS_TRANSACTION_TRUST_ANCHOR: _found = 1; break; default : break; } _found; })) { |
| 3111 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
| 3112 | t->answer_authenticated = true1; |
| 3113 | return 0; |
| 3114 | } |
| 3115 | |
| 3116 | /* Cached stuff is not affected by validation. */ |
| 3117 | if (t->answer_source != DNS_TRANSACTION_NETWORK) |
| 3118 | return 0; |
| 3119 | |
| 3120 | if (!dns_transaction_dnssec_supported_full(t)) { |
| 3121 | /* The server does not support DNSSEC, or doesn't augment responses with RRSIGs. */ |
| 3122 | t->answer_dnssec_result = DNSSEC_INCOMPATIBLE_SERVER; |
| 3123 | log_debug("Not validating response for %" PRIu16 ", used server feature level does not support DNSSEC.", t->id)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3123, __func__ , "Not validating response for %" "u" ", used server feature level does not support DNSSEC." , t->id) : -abs(_e); }); |
| 3124 | return 0; |
| 3125 | } |
| 3126 | |
| 3127 | log_debug("Validating response from transaction %" PRIu16 " (%s).",({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3129, __func__ , "Validating response from transaction %" "u" " (%s).", t-> id, dns_resource_key_to_string(t->key, key_str, sizeof key_str )) : -abs(_e); }) |
| 3128 | t->id,({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3129, __func__ , "Validating response from transaction %" "u" " (%s).", t-> id, dns_resource_key_to_string(t->key, key_str, sizeof key_str )) : -abs(_e); }) |
| 3129 | dns_resource_key_to_string(t->key, key_str, sizeof key_str))({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3129, __func__ , "Validating response from transaction %" "u" " (%s).", t-> id, dns_resource_key_to_string(t->key, key_str, sizeof key_str )) : -abs(_e); }); |
| 3130 | |
| 3131 | /* First, see if this response contains any revoked trust |
| 3132 | * anchors we care about */ |
| 3133 | r = dns_transaction_check_revoked_trust_anchors(t); |
| 3134 | if (r < 0) |
| 3135 | return r; |
| 3136 | |
| 3137 | /* Third, copy all RRs we acquired successfully from auxiliary RRs over. */ |
| 3138 | r = dns_transaction_copy_validated(t); |
| 3139 | if (r < 0) |
| 3140 | return r; |
| 3141 | |
| 3142 | /* Second, see if there are DNSKEYs we already know a |
| 3143 | * validated DS for. */ |
| 3144 | r = dns_transaction_validate_dnskey_by_ds(t); |
| 3145 | if (r < 0) |
| 3146 | return r; |
| 3147 | |
| 3148 | /* Fourth, remove all DNSKEY and DS RRs again that our trust |
| 3149 | * anchor says are revoked. After all we might have marked |
| 3150 | * some keys revoked above, but they might still be lingering |
| 3151 | * in our validated_keys list. */ |
| 3152 | r = dns_transaction_invalidate_revoked_keys(t); |
| 3153 | if (r < 0) |
| 3154 | return r; |
| 3155 | |
| 3156 | phase = DNSSEC_PHASE_DNSKEY; |
| 3157 | for (;;) { |
| 3158 | bool_Bool have_nsec = false0; |
| 3159 | |
| 3160 | r = dnssec_validate_records(t, phase, &have_nsec, &validated); |
| 3161 | if (r <= 0) |
| 3162 | return r; |
| 3163 | |
| 3164 | /* Try again as long as we managed to achieve something */ |
| 3165 | if (r == 1) |
| 3166 | continue; |
| 3167 | |
| 3168 | if (phase == DNSSEC_PHASE_DNSKEY && have_nsec) { |
| 3169 | /* OK, we processed all DNSKEYs, and there are NSEC/NSEC3 RRs, look at those now. */ |
| 3170 | phase = DNSSEC_PHASE_NSEC; |
| 3171 | continue; |
| 3172 | } |
| 3173 | |
| 3174 | if (phase != DNSSEC_PHASE_ALL) { |
| 3175 | /* OK, we processed all DNSKEYs and NSEC/NSEC3 RRs, look at all the rest now. |
| 3176 | * Note that in this third phase we start to remove RRs we couldn't validate. */ |
| 3177 | phase = DNSSEC_PHASE_ALL; |
| 3178 | continue; |
| 3179 | } |
| 3180 | |
| 3181 | /* We're done */ |
| 3182 | break; |
| 3183 | } |
| 3184 | |
| 3185 | dns_answer_unref(t->answer); |
| 3186 | t->answer = TAKE_PTR(validated)({ typeof(validated) _ptr_ = (validated); (validated) = ((void *)0); _ptr_; }); |
| 3187 | |
| 3188 | /* At this point the answer only contains validated |
| 3189 | * RRsets. Now, let's see if it actually answers the question |
| 3190 | * we asked. If so, great! If it doesn't, then see if |
| 3191 | * NSEC/NSEC3 can prove this. */ |
| 3192 | r = dns_transaction_has_positive_answer(t, &flags); |
| 3193 | if (r > 0) { |
| 3194 | /* Yes, it answers the question! */ |
| 3195 | |
| 3196 | if (flags & DNS_ANSWER_AUTHENTICATED) { |
| 3197 | /* The answer is fully authenticated, yay. */ |
| 3198 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
| 3199 | t->answer_rcode = DNS_RCODE_SUCCESS; |
| 3200 | t->answer_authenticated = true1; |
| 3201 | } else { |
| 3202 | /* The answer is not fully authenticated. */ |
| 3203 | t->answer_dnssec_result = DNSSEC_UNSIGNED; |
| 3204 | t->answer_authenticated = false0; |
| 3205 | } |
| 3206 | |
| 3207 | } else if (r == 0) { |
| 3208 | DnssecNsecResult nr; |
| 3209 | bool_Bool authenticated = false0; |
| 3210 | |
| 3211 | /* Bummer! Let's check NSEC/NSEC3 */ |
| 3212 | r = dnssec_nsec_test(t->answer, t->key, &nr, &authenticated, &t->answer_nsec_ttl); |
| 3213 | if (r < 0) |
| 3214 | return r; |
| 3215 | |
| 3216 | switch (nr) { |
| 3217 | |
| 3218 | case DNSSEC_NSEC_NXDOMAIN: |
| 3219 | /* NSEC proves the domain doesn't exist. Very good. */ |
| 3220 | log_debug("Proved NXDOMAIN via NSEC/NSEC3 for transaction %u (%s)", t->id, key_str)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3220, __func__ , "Proved NXDOMAIN via NSEC/NSEC3 for transaction %u (%s)", t ->id, key_str) : -abs(_e); }); |
| 3221 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
| 3222 | t->answer_rcode = DNS_RCODE_NXDOMAIN; |
| 3223 | t->answer_authenticated = authenticated; |
| 3224 | |
| 3225 | manager_dnssec_verdict(t->scope->manager, authenticated ? DNSSEC_SECURE : DNSSEC_INSECURE, t->key); |
| 3226 | break; |
| 3227 | |
| 3228 | case DNSSEC_NSEC_NODATA: |
| 3229 | /* NSEC proves that there's no data here, very good. */ |
| 3230 | log_debug("Proved NODATA via NSEC/NSEC3 for transaction %u (%s)", t->id, key_str)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3230, __func__ , "Proved NODATA via NSEC/NSEC3 for transaction %u (%s)", t-> id, key_str) : -abs(_e); }); |
| 3231 | t->answer_dnssec_result = DNSSEC_VALIDATED; |
| 3232 | t->answer_rcode = DNS_RCODE_SUCCESS; |
| 3233 | t->answer_authenticated = authenticated; |
| 3234 | |
| 3235 | manager_dnssec_verdict(t->scope->manager, authenticated ? DNSSEC_SECURE : DNSSEC_INSECURE, t->key); |
| 3236 | break; |
| 3237 | |
| 3238 | case DNSSEC_NSEC_OPTOUT: |
| 3239 | /* NSEC3 says the data might not be signed */ |
| 3240 | log_debug("Data is NSEC3 opt-out via NSEC/NSEC3 for transaction %u (%s)", t->id, key_str)({ int _level = (((7))), _e = ((0)), _realm = (LOG_REALM_SYSTEMD ); (log_get_max_level_realm(_realm) >= ((_level) & 0x07 )) ? log_internal_realm(((_realm) << 10 | (_level)), _e , "../src/resolve/resolved-dns-transaction.c", 3240, __func__ , "Data is NSEC3 opt-out via NSEC/NSEC3 for transaction %u (%s)" , t->id, key_str) : -abs(_e); }); |
| 3241 | t->answer_dnssec_result = DNSSEC_UNSIGNED; |
| 3242 | t->answer_authenticated = false0; |
| 3243 | |
| 3244 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, t->key); |
| 3245 | break; |
| 3246 | |
| 3247 | case DNSSEC_NSEC_NO_RR: |
| 3248 | /* No NSEC data? Bummer! */ |
| 3249 | |
| 3250 | r = dns_transaction_requires_nsec(t); |
| 3251 | if (r < 0) |
| 3252 | return r; |
| 3253 | if (r > 0) { |
| 3254 | t->answer_dnssec_result = DNSSEC_NO_SIGNATURE; |
| 3255 | manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, t->key); |
| 3256 | } else { |
| 3257 | t->answer_dnssec_result = DNSSEC_UNSIGNED; |
| 3258 | t->answer_authenticated = false0; |
| 3259 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INSECURE, t->key); |
| 3260 | } |
| 3261 | |
| 3262 | break; |
| 3263 | |
| 3264 | case DNSSEC_NSEC_UNSUPPORTED_ALGORITHM: |
| 3265 | /* We don't know the NSEC3 algorithm used? */ |
| 3266 | t->answer_dnssec_result = DNSSEC_UNSUPPORTED_ALGORITHM; |
| 3267 | manager_dnssec_verdict(t->scope->manager, DNSSEC_INDETERMINATE, t->key); |
| 3268 | break; |
| 3269 | |
| 3270 | case DNSSEC_NSEC_FOUND: |
| 3271 | case DNSSEC_NSEC_CNAME: |
| 3272 | /* NSEC says it needs to be there, but we couldn't find it? Bummer! */ |
| 3273 | t->answer_dnssec_result = DNSSEC_NSEC_MISMATCH; |
| 3274 | manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, t->key); |
| 3275 | break; |
| 3276 | |
| 3277 | default: |
| 3278 | assert_not_reached("Unexpected NSEC result.")do { log_assert_failed_unreachable_realm(LOG_REALM_SYSTEMD, ( "Unexpected NSEC result."), "../src/resolve/resolved-dns-transaction.c" , 3278, __PRETTY_FUNCTION__); } while (0); |
| 3279 | } |
| 3280 | } |
| 3281 | |
| 3282 | return 1; |
| 3283 | } |
| 3284 | |
| 3285 | static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] = { |
| 3286 | [DNS_TRANSACTION_NULL] = "null", |
| 3287 | [DNS_TRANSACTION_PENDING] = "pending", |
| 3288 | [DNS_TRANSACTION_VALIDATING] = "validating", |
| 3289 | [DNS_TRANSACTION_RCODE_FAILURE] = "rcode-failure", |
| 3290 | [DNS_TRANSACTION_SUCCESS] = "success", |
| 3291 | [DNS_TRANSACTION_NO_SERVERS] = "no-servers", |
| 3292 | [DNS_TRANSACTION_TIMEOUT] = "timeout", |
| 3293 | [DNS_TRANSACTION_ATTEMPTS_MAX_REACHED] = "attempts-max-reached", |
| 3294 | [DNS_TRANSACTION_INVALID_REPLY] = "invalid-reply", |
| 3295 | [DNS_TRANSACTION_ERRNO] = "errno", |
| 3296 | [DNS_TRANSACTION_ABORTED] = "aborted", |
| 3297 | [DNS_TRANSACTION_DNSSEC_FAILED] = "dnssec-failed", |
| 3298 | [DNS_TRANSACTION_NO_TRUST_ANCHOR] = "no-trust-anchor", |
| 3299 | [DNS_TRANSACTION_RR_TYPE_UNSUPPORTED] = "rr-type-unsupported", |
| 3300 | [DNS_TRANSACTION_NETWORK_DOWN] = "network-down", |
| 3301 | [DNS_TRANSACTION_NOT_FOUND] = "not-found", |
| 3302 | }; |
| 3303 | DEFINE_STRING_TABLE_LOOKUP(dns_transaction_state, DnsTransactionState)const char *dns_transaction_state_to_string(DnsTransactionState i) { if (i < 0 || i >= (DnsTransactionState) __extension__ (__builtin_choose_expr( !__builtin_types_compatible_p(typeof (dns_transaction_state_table), typeof(&*(dns_transaction_state_table ))), sizeof(dns_transaction_state_table)/sizeof((dns_transaction_state_table )[0]), ((void)0)))) return ((void*)0); return dns_transaction_state_table [i]; } DnsTransactionState dns_transaction_state_from_string( const char *s) { return (DnsTransactionState) string_table_lookup (dns_transaction_state_table, __extension__ (__builtin_choose_expr ( !__builtin_types_compatible_p(typeof(dns_transaction_state_table ), typeof(&*(dns_transaction_state_table))), sizeof(dns_transaction_state_table )/sizeof((dns_transaction_state_table)[0]), ((void)0))), s); }; |
| 3304 | |
| 3305 | static const char* const dns_transaction_source_table[_DNS_TRANSACTION_SOURCE_MAX] = { |
| 3306 | [DNS_TRANSACTION_NETWORK] = "network", |
| 3307 | [DNS_TRANSACTION_CACHE] = "cache", |
| 3308 | [DNS_TRANSACTION_ZONE] = "zone", |
| 3309 | [DNS_TRANSACTION_TRUST_ANCHOR] = "trust-anchor", |
| 3310 | }; |
| 3311 | DEFINE_STRING_TABLE_LOOKUP(dns_transaction_source, DnsTransactionSource)const char *dns_transaction_source_to_string(DnsTransactionSource i) { if (i < 0 || i >= (DnsTransactionSource) __extension__ (__builtin_choose_expr( !__builtin_types_compatible_p(typeof (dns_transaction_source_table), typeof(&*(dns_transaction_source_table ))), sizeof(dns_transaction_source_table)/sizeof((dns_transaction_source_table )[0]), ((void)0)))) return ((void*)0); return dns_transaction_source_table [i]; } DnsTransactionSource dns_transaction_source_from_string (const char *s) { return (DnsTransactionSource) string_table_lookup (dns_transaction_source_table, __extension__ (__builtin_choose_expr ( !__builtin_types_compatible_p(typeof(dns_transaction_source_table ), typeof(&*(dns_transaction_source_table))), sizeof(dns_transaction_source_table )/sizeof((dns_transaction_source_table)[0]), ((void)0))), s); }; |