| File: | build-scan/../src/fuzz/fuzz-dhcp-server.c |
| Warning: | line 49, column 9 Potential leak of memory pointed to by 'server' |
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| 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |||
| 2 | ||||
| 3 | #include "fuzz.h" | |||
| 4 | ||||
| 5 | #include "sd-dhcp-server.c" | |||
| 6 | ||||
| 7 | /* stub out network so that the server doesn't send */ | |||
| 8 | ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen) { | |||
| 9 | return len; | |||
| 10 | } | |||
| 11 | ||||
| 12 | ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags) { | |||
| 13 | return 0; | |||
| 14 | } | |||
| 15 | ||||
| 16 | int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { | |||
| 17 | _cleanup_(sd_dhcp_server_unrefp)__attribute__((cleanup(sd_dhcp_server_unrefp))) sd_dhcp_server *server = NULL((void*)0); | |||
| 18 | struct in_addr address = {.s_addr = htobe32(UINT32_C(10)10U << 24 | UINT32_C(1)1U)}; | |||
| 19 | static const uint8_t chaddr[] = {3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3}; | |||
| 20 | uint8_t *client_id; | |||
| 21 | DHCPLease *lease; | |||
| 22 | int pool_offset; | |||
| 23 | ||||
| 24 | if (size < sizeof(DHCPMessage)) | |||
| ||||
| 25 | return 0; | |||
| 26 | ||||
| 27 | assert_se(sd_dhcp_server_new(&server, 1) >= 0)do { if ((__builtin_expect(!!(!(sd_dhcp_server_new(&server , 1) >= 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD , ("sd_dhcp_server_new(&server, 1) >= 0"), "../src/fuzz/fuzz-dhcp-server.c" , 27, __PRETTY_FUNCTION__); } while (0); | |||
| 28 | server->fd = open("/dev/null", O_RDWR02|O_CLOEXEC02000000|O_NOCTTY0400); | |||
| 29 | assert_se(server->fd >= 0)do { if ((__builtin_expect(!!(!(server->fd >= 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server->fd >= 0"), "../src/fuzz/fuzz-dhcp-server.c" , 29, __PRETTY_FUNCTION__); } while (0); | |||
| 30 | assert_se(sd_dhcp_server_configure_pool(server, &address, 24, 0, 0) >= 0)do { if ((__builtin_expect(!!(!(sd_dhcp_server_configure_pool (server, &address, 24, 0, 0) >= 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("sd_dhcp_server_configure_pool(server, &address, 24, 0, 0) >= 0" ), "../src/fuzz/fuzz-dhcp-server.c", 30, __PRETTY_FUNCTION__) ; } while (0); | |||
| 31 | ||||
| 32 | /* add a lease to the pool to expose additional code paths */ | |||
| 33 | client_id = malloc(2); | |||
| 34 | assert_se(client_id)do { if ((__builtin_expect(!!(!(client_id)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("client_id"), "../src/fuzz/fuzz-dhcp-server.c" , 34, __PRETTY_FUNCTION__); } while (0); | |||
| 35 | client_id[0] = 2; | |||
| 36 | client_id[1] = 2; | |||
| 37 | lease = new0(DHCPLease, 1)((DHCPLease*) calloc((1), sizeof(DHCPLease))); | |||
| 38 | assert_se(lease)do { if ((__builtin_expect(!!(!(lease)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("lease"), "../src/fuzz/fuzz-dhcp-server.c" , 38, __PRETTY_FUNCTION__); } while (0); | |||
| 39 | lease->client_id.length = 2; | |||
| 40 | lease->client_id.data = client_id; | |||
| 41 | lease->address = htobe32(UINT32_C(10)10U << 24 | UINT32_C(2)2U); | |||
| 42 | lease->gateway = htobe32(UINT32_C(10)10U << 24 | UINT32_C(1)1U); | |||
| 43 | lease->expiration = UINT64_MAX(18446744073709551615UL); | |||
| 44 | memcpy(lease->chaddr, chaddr, 16); | |||
| 45 | pool_offset = get_pool_offset(server, lease->address); | |||
| 46 | server->bound_leases[pool_offset] = lease; | |||
| 47 | assert_se(hashmap_put(server->leases_by_client_id, &lease->client_id, lease) >= 0)do { if ((__builtin_expect(!!(!(hashmap_put(server->leases_by_client_id , &lease->client_id, lease) >= 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("hashmap_put(server->leases_by_client_id, &lease->client_id, lease) >= 0" ), "../src/fuzz/fuzz-dhcp-server.c", 47, __PRETTY_FUNCTION__) ; } while (0); | |||
| 48 | ||||
| 49 | (void) dhcp_server_handle_message(server, (DHCPMessage*)data, size); | |||
| ||||
| 50 | ||||
| 51 | return 0; | |||
| 52 | } |
| 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
| 2 | /*** |
| 3 | Copyright © 2013 Intel Corporation. All rights reserved. |
| 4 | ***/ |
| 5 | |
| 6 | #include <sys/ioctl.h> |
| 7 | |
| 8 | #include "sd-dhcp-server.h" |
| 9 | |
| 10 | #include "alloc-util.h" |
| 11 | #include "dhcp-internal.h" |
| 12 | #include "dhcp-server-internal.h" |
| 13 | #include "fd-util.h" |
| 14 | #include "in-addr-util.h" |
| 15 | #include "sd-id128.h" |
| 16 | #include "siphash24.h" |
| 17 | #include "string-util.h" |
| 18 | #include "unaligned.h" |
| 19 | |
| 20 | #define DHCP_DEFAULT_LEASE_TIME_USEC((usec_t) (60ULL*((usec_t) (60ULL*((usec_t) 1000000ULL))))) USEC_PER_HOUR((usec_t) (60ULL*((usec_t) (60ULL*((usec_t) 1000000ULL))))) |
| 21 | #define DHCP_MAX_LEASE_TIME_USEC(((usec_t) (60ULL*((usec_t) (60ULL*((usec_t) 1000000ULL)))))* 12) (USEC_PER_HOUR((usec_t) (60ULL*((usec_t) (60ULL*((usec_t) 1000000ULL)))))*12) |
| 22 | |
| 23 | static void dhcp_lease_free(DHCPLease *lease) { |
| 24 | if (!lease) |
| 25 | return; |
| 26 | |
| 27 | free(lease->client_id.data); |
| 28 | free(lease); |
| 29 | } |
| 30 | |
| 31 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
| 32 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address |
| 33 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to |
| 34 | * accidentally hand it out */ |
| 35 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { |
| 36 | struct in_addr netmask_addr; |
| 37 | be32_t netmask; |
| 38 | uint32_t server_off, broadcast_off, size_max; |
| 39 | |
| 40 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 40, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 41 | assert_return(address, -EINVAL)do { if (!(((__builtin_expect(!!(address),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("address"), "../src/libsystemd-network/sd-dhcp-server.c" , 41, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 42 | assert_return(address->s_addr != INADDR_ANY, -EINVAL)do { if (!(((__builtin_expect(!!(address->s_addr != ((in_addr_t ) 0x00000000)),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD , ("address->s_addr != INADDR_ANY"), "../src/libsystemd-network/sd-dhcp-server.c" , 42, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 43 | assert_return(prefixlen <= 32, -ERANGE)do { if (!(((__builtin_expect(!!(prefixlen <= 32),1))) ? ( 1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("prefixlen <= 32" ), "../src/libsystemd-network/sd-dhcp-server.c", 43, __PRETTY_FUNCTION__ ), 0))) return (-34); } while (0); |
| 44 | |
| 45 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen))do { if ((__builtin_expect(!!(!(in4_addr_prefixlen_to_netmask (&netmask_addr, prefixlen))),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)" ), "../src/libsystemd-network/sd-dhcp-server.c", 45, __PRETTY_FUNCTION__ ); } while (0); |
| 46 | netmask = netmask_addr.s_addr; |
| 47 | |
| 48 | server_off = be32toh(address->s_addr & ~netmask); |
| 49 | broadcast_off = be32toh(~netmask); |
| 50 | |
| 51 | /* the server address cannot be the subnet address */ |
| 52 | assert_return(server_off != 0, -ERANGE)do { if (!(((__builtin_expect(!!(server_off != 0),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("server_off != 0" ), "../src/libsystemd-network/sd-dhcp-server.c", 52, __PRETTY_FUNCTION__ ), 0))) return (-34); } while (0); |
| 53 | |
| 54 | /* nor the broadcast address */ |
| 55 | assert_return(server_off != broadcast_off, -ERANGE)do { if (!(((__builtin_expect(!!(server_off != broadcast_off) ,1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD , ("server_off != broadcast_off"), "../src/libsystemd-network/sd-dhcp-server.c" , 55, __PRETTY_FUNCTION__), 0))) return (-34); } while (0); |
| 56 | |
| 57 | /* 0 offset means we should set a default, we skip the first (subnet) address |
| 58 | and take the next one */ |
| 59 | if (offset == 0) |
| 60 | offset = 1; |
| 61 | |
| 62 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ |
| 63 | - offset /* exclude the addresses before the offset */ |
| 64 | - 1; /* exclude the last (broadcast) address */ |
| 65 | |
| 66 | /* The pool must contain at least one address */ |
| 67 | assert_return(size_max >= 1, -ERANGE)do { if (!(((__builtin_expect(!!(size_max >= 1),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("size_max >= 1" ), "../src/libsystemd-network/sd-dhcp-server.c", 67, __PRETTY_FUNCTION__ ), 0))) return (-34); } while (0); |
| 68 | |
| 69 | if (size != 0) |
| 70 | assert_return(size <= size_max, -ERANGE)do { if (!(((__builtin_expect(!!(size <= size_max),1))) ? ( 1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("size <= size_max" ), "../src/libsystemd-network/sd-dhcp-server.c", 70, __PRETTY_FUNCTION__ ), 0))) return (-34); } while (0); |
| 71 | else |
| 72 | size = size_max; |
| 73 | |
| 74 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
| 75 | |
| 76 | free(server->bound_leases); |
| 77 | server->bound_leases = new0(DHCPLease*, size)((DHCPLease**) calloc((size), sizeof(DHCPLease*))); |
| 78 | if (!server->bound_leases) |
| 79 | return -ENOMEM12; |
| 80 | |
| 81 | server->pool_offset = offset; |
| 82 | server->pool_size = size; |
| 83 | |
| 84 | server->address = address->s_addr; |
| 85 | server->netmask = netmask; |
| 86 | server->subnet = address->s_addr & netmask; |
| 87 | |
| 88 | if (server_off >= offset && server_off - offset < size) |
| 89 | server->bound_leases[server_off - offset] = &server->invalid_lease; |
| 90 | |
| 91 | /* Drop any leases associated with the old address range */ |
| 92 | hashmap_clear_with_destructor(server->leases_by_client_id, dhcp_lease_free)({ void *_item; while ((_item = hashmap_steal_first(server-> leases_by_client_id))) dhcp_lease_free(_item); }); |
| 93 | } |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
| 99 | assert_return(server, false)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 99, __PRETTY_FUNCTION__), 0))) return (0); } while (0); |
| 100 | |
| 101 | return !!server->receive_message; |
| 102 | } |
| 103 | |
| 104 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
| 105 | |
| 106 | if (!server) |
| 107 | return NULL((void*)0); |
| 108 | |
| 109 | assert(server->n_ref >= 1)do { if ((__builtin_expect(!!(!(server->n_ref >= 1)),0) )) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("server->n_ref >= 1" ), "../src/libsystemd-network/sd-dhcp-server.c", 109, __PRETTY_FUNCTION__ ); } while (0); |
| 110 | server->n_ref++; |
| 111 | |
| 112 | return server; |
| 113 | } |
| 114 | |
| 115 | void client_id_hash_func(const void *p, struct siphash *state) { |
| 116 | const DHCPClientId *id = p; |
| 117 | |
| 118 | assert(id)do { if ((__builtin_expect(!!(!(id)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("id"), "../src/libsystemd-network/sd-dhcp-server.c" , 118, __PRETTY_FUNCTION__); } while (0); |
| 119 | assert(id->length)do { if ((__builtin_expect(!!(!(id->length)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("id->length"), "../src/libsystemd-network/sd-dhcp-server.c" , 119, __PRETTY_FUNCTION__); } while (0); |
| 120 | assert(id->data)do { if ((__builtin_expect(!!(!(id->data)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("id->data"), "../src/libsystemd-network/sd-dhcp-server.c" , 120, __PRETTY_FUNCTION__); } while (0); |
| 121 | |
| 122 | siphash24_compress(&id->length, sizeof(id->length), state); |
| 123 | siphash24_compress(id->data, id->length, state); |
| 124 | } |
| 125 | |
| 126 | int client_id_compare_func(const void *_a, const void *_b) { |
| 127 | const DHCPClientId *a, *b; |
| 128 | |
| 129 | a = _a; |
| 130 | b = _b; |
| 131 | |
| 132 | assert(!a->length || a->data)do { if ((__builtin_expect(!!(!(!a->length || a->data)) ,0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!a->length || a->data" ), "../src/libsystemd-network/sd-dhcp-server.c", 132, __PRETTY_FUNCTION__ ); } while (0); |
| 133 | assert(!b->length || b->data)do { if ((__builtin_expect(!!(!(!b->length || b->data)) ,0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!b->length || b->data" ), "../src/libsystemd-network/sd-dhcp-server.c", 133, __PRETTY_FUNCTION__ ); } while (0); |
| 134 | |
| 135 | if (a->length != b->length) |
| 136 | return a->length < b->length ? -1 : 1; |
| 137 | |
| 138 | return memcmp(a->data, b->data, a->length); |
| 139 | } |
| 140 | |
| 141 | static const struct hash_ops client_id_hash_ops = { |
| 142 | .hash = client_id_hash_func, |
| 143 | .compare = client_id_compare_func |
| 144 | }; |
| 145 | |
| 146 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
| 147 | DHCPLease *lease; |
| 148 | |
| 149 | if (!server) |
| 150 | return NULL((void*)0); |
| 151 | |
| 152 | assert(server->n_ref >= 1)do { if ((__builtin_expect(!!(!(server->n_ref >= 1)),0) )) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("server->n_ref >= 1" ), "../src/libsystemd-network/sd-dhcp-server.c", 152, __PRETTY_FUNCTION__ ); } while (0); |
| 153 | server->n_ref--; |
| 154 | |
| 155 | if (server->n_ref > 0) |
| 156 | return NULL((void*)0); |
| 157 | |
| 158 | log_dhcp_server(server, "UNREF")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 158, __func__ , "DHCP SERVER: " "UNREF"); |
| 159 | |
| 160 | sd_dhcp_server_stop(server); |
| 161 | |
| 162 | sd_event_unref(server->event); |
| 163 | |
| 164 | free(server->timezone); |
| 165 | free(server->dns); |
| 166 | free(server->ntp); |
| 167 | |
| 168 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
| 169 | dhcp_lease_free(lease); |
| 170 | hashmap_free(server->leases_by_client_id); |
| 171 | |
| 172 | free(server->bound_leases); |
| 173 | return mfree(server); |
| 174 | } |
| 175 | |
| 176 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
| 177 | _cleanup_(sd_dhcp_server_unrefp)__attribute__((cleanup(sd_dhcp_server_unrefp))) sd_dhcp_server *server = NULL((void*)0); |
| 178 | |
| 179 | assert_return(ret, -EINVAL)do { if (!(((__builtin_expect(!!(ret),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("ret"), "../src/libsystemd-network/sd-dhcp-server.c" , 179, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 180 | assert_return(ifindex > 0, -EINVAL)do { if (!(((__builtin_expect(!!(ifindex > 0),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("ifindex > 0" ), "../src/libsystemd-network/sd-dhcp-server.c", 180, __PRETTY_FUNCTION__ ), 0))) return (-22); } while (0); |
| 181 | |
| 182 | server = new0(sd_dhcp_server, 1)((sd_dhcp_server*) calloc((1), sizeof(sd_dhcp_server))); |
| 183 | if (!server) |
| 184 | return -ENOMEM12; |
| 185 | |
| 186 | server->n_ref = 1; |
| 187 | server->fd_raw = -1; |
| 188 | server->fd = -1; |
| 189 | server->address = htobe32(INADDR_ANY((in_addr_t) 0x00000000)); |
| 190 | server->netmask = htobe32(INADDR_ANY((in_addr_t) 0x00000000)); |
| 191 | server->ifindex = ifindex; |
| 192 | |
| 193 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops)internal_hashmap_new(&client_id_hash_ops ); |
| 194 | if (!server->leases_by_client_id) |
| 195 | return -ENOMEM12; |
| 196 | |
| 197 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC)({ const typeof((((usec_t) (60ULL*((usec_t) (60ULL*((usec_t) 1000000ULL ))))))) __unique_prefix_X6 = ((((usec_t) (60ULL*((usec_t) (60ULL *((usec_t) 1000000ULL))))))); const typeof((((usec_t) 1000000ULL ))) __unique_prefix_Y7 = ((((usec_t) 1000000ULL))); (__unique_prefix_X6 / __unique_prefix_Y7 + !!(__unique_prefix_X6 % __unique_prefix_Y7 )); }); |
| 198 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC)({ const typeof(((((usec_t) (60ULL*((usec_t) (60ULL*((usec_t) 1000000ULL)))))*12))) __unique_prefix_X8 = (((((usec_t) (60ULL *((usec_t) (60ULL*((usec_t) 1000000ULL)))))*12))); const typeof ((((usec_t) 1000000ULL))) __unique_prefix_Y9 = ((((usec_t) 1000000ULL ))); (__unique_prefix_X8 / __unique_prefix_Y9 + !!(__unique_prefix_X8 % __unique_prefix_Y9)); }); |
| 199 | |
| 200 | *ret = TAKE_PTR(server)({ typeof(server) _ptr_ = (server); (server) = ((void*)0); _ptr_ ; }); |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
| 206 | int r; |
| 207 | |
| 208 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 208, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 209 | assert_return(!server->event, -EBUSY)do { if (!(((__builtin_expect(!!(!server->event),1))) ? (1 ) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("!server->event" ), "../src/libsystemd-network/sd-dhcp-server.c", 209, __PRETTY_FUNCTION__ ), 0))) return (-16); } while (0); |
| 210 | |
| 211 | if (event) |
| 212 | server->event = sd_event_ref(event); |
| 213 | else { |
| 214 | r = sd_event_default(&server->event); |
| 215 | if (r < 0) |
| 216 | return r; |
| 217 | } |
| 218 | |
| 219 | server->event_priority = priority; |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { |
| 225 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 225, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 226 | |
| 227 | server->event = sd_event_unref(server->event); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { |
| 233 | assert_return(server, NULL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 233, __PRETTY_FUNCTION__), 0))) return (((void*)0)); } while (0); |
| 234 | |
| 235 | return server->event; |
| 236 | } |
| 237 | |
| 238 | int sd_dhcp_server_stop(sd_dhcp_server *server) { |
| 239 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 239, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 240 | |
| 241 | server->receive_message = |
| 242 | sd_event_source_unref(server->receive_message); |
| 243 | |
| 244 | server->fd_raw = safe_close(server->fd_raw); |
| 245 | server->fd = safe_close(server->fd); |
| 246 | |
| 247 | log_dhcp_server(server, "STOPPED")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 247, __func__ , "DHCP SERVER: " "STOPPED"); |
| 248 | |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
| 253 | DHCPPacket *packet, size_t len) { |
| 254 | union sockaddr_union link = { |
| 255 | .ll.sll_family = AF_PACKET17, |
| 256 | .ll.sll_protocol = htobe16(ETH_P_IP0x0800), |
| 257 | .ll.sll_ifindex = server->ifindex, |
| 258 | .ll.sll_halen = ETH_ALEN6, |
| 259 | }; |
| 260 | |
| 261 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 261, __PRETTY_FUNCTION__); } while (0); |
| 262 | assert(server->ifindex > 0)do { if ((__builtin_expect(!!(!(server->ifindex > 0)),0 ))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("server->ifindex > 0" ), "../src/libsystemd-network/sd-dhcp-server.c", 262, __PRETTY_FUNCTION__ ); } while (0); |
| 263 | assert(server->address)do { if ((__builtin_expect(!!(!(server->address)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server->address"), "../src/libsystemd-network/sd-dhcp-server.c" , 263, __PRETTY_FUNCTION__); } while (0); |
| 264 | assert(packet)do { if ((__builtin_expect(!!(!(packet)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("packet"), "../src/libsystemd-network/sd-dhcp-server.c" , 264, __PRETTY_FUNCTION__); } while (0); |
| 265 | assert(len > sizeof(DHCPPacket))do { if ((__builtin_expect(!!(!(len > sizeof(DHCPPacket))) ,0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("len > sizeof(DHCPPacket)" ), "../src/libsystemd-network/sd-dhcp-server.c", 265, __PRETTY_FUNCTION__ ); } while (0); |
| 266 | |
| 267 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN6); |
| 268 | |
| 269 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, |
| 270 | packet->dhcp.yiaddr, |
| 271 | DHCP_PORT_CLIENT, len); |
| 272 | |
| 273 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
| 274 | } |
| 275 | |
| 276 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, |
| 277 | uint16_t destination_port, |
| 278 | DHCPMessage *message, size_t len) { |
| 279 | union sockaddr_union dest = { |
| 280 | .in.sin_family = AF_INET2, |
| 281 | .in.sin_port = htobe16(destination_port), |
| 282 | .in.sin_addr.s_addr = destination, |
| 283 | }; |
| 284 | struct iovec iov = { |
| 285 | .iov_base = message, |
| 286 | .iov_len = len, |
| 287 | }; |
| 288 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))((((sizeof (struct cmsghdr)) + sizeof (size_t) - 1) & (size_t ) ~(sizeof (size_t) - 1)) + (sizeof(struct in_pktinfo)))] = {}; |
| 289 | struct msghdr msg = { |
| 290 | .msg_name = &dest, |
| 291 | .msg_namelen = sizeof(dest.in), |
| 292 | .msg_iov = &iov, |
| 293 | .msg_iovlen = 1, |
| 294 | .msg_control = cmsgbuf, |
| 295 | .msg_controllen = sizeof(cmsgbuf), |
| 296 | }; |
| 297 | struct cmsghdr *cmsg; |
| 298 | struct in_pktinfo *pktinfo; |
| 299 | |
| 300 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 300, __PRETTY_FUNCTION__); } while (0); |
| 301 | assert(server->fd >= 0)do { if ((__builtin_expect(!!(!(server->fd >= 0)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server->fd >= 0"), "../src/libsystemd-network/sd-dhcp-server.c" , 301, __PRETTY_FUNCTION__); } while (0); |
| 302 | assert(message)do { if ((__builtin_expect(!!(!(message)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("message"), "../src/libsystemd-network/sd-dhcp-server.c" , 302, __PRETTY_FUNCTION__); } while (0); |
| 303 | assert(len > sizeof(DHCPMessage))do { if ((__builtin_expect(!!(!(len > sizeof(DHCPMessage)) ),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("len > sizeof(DHCPMessage)" ), "../src/libsystemd-network/sd-dhcp-server.c", 303, __PRETTY_FUNCTION__ ); } while (0); |
| 304 | |
| 305 | cmsg = CMSG_FIRSTHDR(&msg)((size_t) (&msg)->msg_controllen >= sizeof (struct cmsghdr ) ? (struct cmsghdr *) (&msg)->msg_control : (struct cmsghdr *) 0); |
| 306 | assert(cmsg)do { if ((__builtin_expect(!!(!(cmsg)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("cmsg"), "../src/libsystemd-network/sd-dhcp-server.c" , 306, __PRETTY_FUNCTION__); } while (0); |
| 307 | |
| 308 | cmsg->cmsg_level = IPPROTO_IPIPPROTO_IP; |
| 309 | cmsg->cmsg_type = IP_PKTINFO8; |
| 310 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo))((((sizeof (struct cmsghdr)) + sizeof (size_t) - 1) & (size_t ) ~(sizeof (size_t) - 1)) + (sizeof(struct in_pktinfo))); |
| 311 | |
| 312 | /* we attach source interface and address info to the message |
| 313 | rather than binding the socket. This will be mostly useful |
| 314 | when we gain support for arbitrary number of server addresses |
| 315 | */ |
| 316 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg)((cmsg)->__cmsg_data); |
| 317 | assert(pktinfo)do { if ((__builtin_expect(!!(!(pktinfo)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("pktinfo"), "../src/libsystemd-network/sd-dhcp-server.c" , 317, __PRETTY_FUNCTION__); } while (0); |
| 318 | |
| 319 | pktinfo->ipi_ifindex = server->ifindex; |
| 320 | pktinfo->ipi_spec_dst.s_addr = server->address; |
| 321 | |
| 322 | if (sendmsg(server->fd, &msg, 0) < 0) |
| 323 | return -errno(*__errno_location ()); |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | static bool_Bool requested_broadcast(DHCPRequest *req) { |
| 329 | assert(req)do { if ((__builtin_expect(!!(!(req)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("req"), "../src/libsystemd-network/sd-dhcp-server.c" , 329, __PRETTY_FUNCTION__); } while (0); |
| 330 | |
| 331 | return req->message->flags & htobe16(0x8000); |
| 332 | } |
| 333 | |
| 334 | int dhcp_server_send_packet(sd_dhcp_server *server, |
| 335 | DHCPRequest *req, DHCPPacket *packet, |
| 336 | int type, size_t optoffset) { |
| 337 | be32_t destination = INADDR_ANY((in_addr_t) 0x00000000); |
| 338 | uint16_t destination_port = DHCP_PORT_CLIENT; |
| 339 | int r; |
| 340 | |
| 341 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 341, __PRETTY_FUNCTION__); } while (0); |
| 342 | assert(req)do { if ((__builtin_expect(!!(!(req)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("req"), "../src/libsystemd-network/sd-dhcp-server.c" , 342, __PRETTY_FUNCTION__); } while (0); |
| 343 | assert(req->max_optlen)do { if ((__builtin_expect(!!(!(req->max_optlen)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("req->max_optlen"), "../src/libsystemd-network/sd-dhcp-server.c" , 343, __PRETTY_FUNCTION__); } while (0); |
| 344 | assert(optoffset <= req->max_optlen)do { if ((__builtin_expect(!!(!(optoffset <= req->max_optlen )),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("optoffset <= req->max_optlen" ), "../src/libsystemd-network/sd-dhcp-server.c", 344, __PRETTY_FUNCTION__ ); } while (0); |
| 345 | assert(packet)do { if ((__builtin_expect(!!(!(packet)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("packet"), "../src/libsystemd-network/sd-dhcp-server.c" , 345, __PRETTY_FUNCTION__); } while (0); |
| 346 | |
| 347 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, |
| 348 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
| 349 | 4, &server->address); |
| 350 | if (r < 0) |
| 351 | return r; |
| 352 | |
| 353 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, |
| 354 | SD_DHCP_OPTION_END, 0, NULL((void*)0)); |
| 355 | if (r < 0) |
| 356 | return r; |
| 357 | |
| 358 | /* RFC 2131 Section 4.1 |
| 359 | |
| 360 | If the ’giaddr’ field in a DHCP message from a client is non-zero, |
| 361 | the server sends any return messages to the ’DHCP server’ port on the |
| 362 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ |
| 363 | field is zero and the ’ciaddr’ field is nonzero, then the server |
| 364 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. |
| 365 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is |
| 366 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to |
| 367 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and |
| 368 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK |
| 369 | messages to the client’s hardware address and ’yiaddr’ address. In |
| 370 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK |
| 371 | messages to 0xffffffff. |
| 372 | |
| 373 | Section 4.3.2 |
| 374 | |
| 375 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a |
| 376 | different subnet. The server MUST set the broadcast bit in the |
| 377 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the |
| 378 | client, because the client may not have a correct network address |
| 379 | or subnet mask, and the client may not be answering ARP requests. |
| 380 | */ |
| 381 | if (req->message->giaddr) { |
| 382 | destination = req->message->giaddr; |
| 383 | destination_port = DHCP_PORT_SERVER; |
| 384 | if (type == DHCP_NAK) |
| 385 | packet->dhcp.flags = htobe16(0x8000); |
| 386 | } else if (req->message->ciaddr && type != DHCP_NAK) |
| 387 | destination = req->message->ciaddr; |
| 388 | |
| 389 | if (destination != INADDR_ANY((in_addr_t) 0x00000000)) |
| 390 | return dhcp_server_send_udp(server, destination, |
| 391 | destination_port, &packet->dhcp, |
| 392 | sizeof(DHCPMessage) + optoffset); |
| 393 | else if (requested_broadcast(req) || type == DHCP_NAK) |
| 394 | return dhcp_server_send_udp(server, INADDR_BROADCAST((in_addr_t) 0xffffffff), |
| 395 | destination_port, &packet->dhcp, |
| 396 | sizeof(DHCPMessage) + optoffset); |
| 397 | else |
| 398 | /* we cannot send UDP packet to specific MAC address when the |
| 399 | address is not yet configured, so must fall back to raw |
| 400 | packets */ |
| 401 | return dhcp_server_send_unicast_raw(server, packet, |
| 402 | sizeof(DHCPPacket) + optoffset); |
| 403 | } |
| 404 | |
| 405 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
| 406 | uint8_t type, size_t *_optoffset, |
| 407 | DHCPRequest *req) { |
| 408 | _cleanup_free___attribute__((cleanup(freep))) DHCPPacket *packet = NULL((void*)0); |
| 409 | size_t optoffset = 0; |
| 410 | int r; |
| 411 | |
| 412 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 412, __PRETTY_FUNCTION__); } while (0); |
| 413 | assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("ret"), "../src/libsystemd-network/sd-dhcp-server.c" , 413, __PRETTY_FUNCTION__); } while (0); |
| 414 | assert(_optoffset)do { if ((__builtin_expect(!!(!(_optoffset)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("_optoffset"), "../src/libsystemd-network/sd-dhcp-server.c" , 414, __PRETTY_FUNCTION__); } while (0); |
| 415 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK))do { if ((__builtin_expect(!!(!(({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended[20 - sizeof((int[]){DHCP_OFFER, DHCP_ACK, DHCP_NAK})/sizeof(int )]; switch(type) { case DHCP_OFFER: case DHCP_ACK: case DHCP_NAK : _found = 1; break; default: break; } _found; }))),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)" ), "../src/libsystemd-network/sd-dhcp-server.c", 415, __PRETTY_FUNCTION__ ); } while (0); |
| 416 | |
| 417 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen)(calloc(1, (sizeof(DHCPPacket) + req->max_optlen))); |
| 418 | if (!packet) |
| 419 | return -ENOMEM12; |
| 420 | |
| 421 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
| 422 | be32toh(req->message->xid), type, ARPHRD_ETHER1, |
| 423 | req->max_optlen, &optoffset); |
| 424 | if (r < 0) |
| 425 | return r; |
| 426 | |
| 427 | packet->dhcp.flags = req->message->flags; |
| 428 | packet->dhcp.giaddr = req->message->giaddr; |
| 429 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN6); |
| 430 | |
| 431 | *_optoffset = optoffset; |
| 432 | *ret = TAKE_PTR(packet)({ typeof(packet) _ptr_ = (packet); (packet) = ((void*)0); _ptr_ ; }); |
| 433 | |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
| 438 | be32_t address) { |
| 439 | _cleanup_free___attribute__((cleanup(freep))) DHCPPacket *packet = NULL((void*)0); |
| 440 | size_t offset; |
| 441 | be32_t lease_time; |
| 442 | int r; |
| 443 | |
| 444 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); |
| 445 | if (r < 0) |
| 446 | return r; |
| 447 | |
| 448 | packet->dhcp.yiaddr = address; |
| 449 | |
| 450 | lease_time = htobe32(req->lifetime); |
| 451 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
| 452 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
| 453 | &lease_time); |
| 454 | if (r < 0) |
| 455 | return r; |
| 456 | |
| 457 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
| 458 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
| 459 | if (r < 0) |
| 460 | return r; |
| 461 | |
| 462 | if (server->emit_router) { |
| 463 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
| 464 | SD_DHCP_OPTION_ROUTER, 4, &server->address); |
| 465 | if (r < 0) |
| 466 | return r; |
| 467 | } |
| 468 | |
| 469 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
| 470 | if (r < 0) |
| 471 | return r; |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
| 477 | be32_t address) { |
| 478 | _cleanup_free___attribute__((cleanup(freep))) DHCPPacket *packet = NULL((void*)0); |
| 479 | size_t offset; |
| 480 | be32_t lease_time; |
| 481 | int r; |
| 482 | |
| 483 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); |
| 484 | if (r < 0) |
| 485 | return r; |
| 486 | |
| 487 | packet->dhcp.yiaddr = address; |
| 488 | |
| 489 | lease_time = htobe32(req->lifetime); |
| 490 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
| 491 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
| 492 | &lease_time); |
| 493 | if (r < 0) |
| 494 | return r; |
| 495 | |
| 496 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
| 497 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
| 498 | if (r < 0) |
| 499 | return r; |
| 500 | |
| 501 | if (server->emit_router) { |
| 502 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
| 503 | SD_DHCP_OPTION_ROUTER, 4, &server->address); |
| 504 | if (r < 0) |
| 505 | return r; |
| 506 | } |
| 507 | |
| 508 | if (server->n_dns > 0) { |
| 509 | r = dhcp_option_append( |
| 510 | &packet->dhcp, req->max_optlen, &offset, 0, |
| 511 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
| 512 | sizeof(struct in_addr) * server->n_dns, server->dns); |
| 513 | if (r < 0) |
| 514 | return r; |
| 515 | } |
| 516 | |
| 517 | if (server->n_ntp > 0) { |
| 518 | r = dhcp_option_append( |
| 519 | &packet->dhcp, req->max_optlen, &offset, 0, |
| 520 | SD_DHCP_OPTION_NTP_SERVER, |
| 521 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
| 522 | if (r < 0) |
| 523 | return r; |
| 524 | } |
| 525 | |
| 526 | if (server->timezone) { |
| 527 | r = dhcp_option_append( |
| 528 | &packet->dhcp, req->max_optlen, &offset, 0, |
| 529 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
| 530 | strlen(server->timezone), server->timezone); |
| 531 | if (r < 0) |
| 532 | return r; |
| 533 | } |
| 534 | |
| 535 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
| 536 | if (r < 0) |
| 537 | return r; |
| 538 | |
| 539 | return 0; |
| 540 | } |
| 541 | |
| 542 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
| 543 | _cleanup_free___attribute__((cleanup(freep))) DHCPPacket *packet = NULL((void*)0); |
| 544 | size_t offset; |
| 545 | int r; |
| 546 | |
| 547 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); |
| 548 | if (r < 0) |
| 549 | return r; |
| 550 | |
| 551 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
| 552 | } |
| 553 | |
| 554 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
| 555 | be32_t gateway, uint8_t chaddr[]) { |
| 556 | _cleanup_free___attribute__((cleanup(freep))) DHCPPacket *packet = NULL((void*)0); |
| 557 | size_t optoffset = 0; |
| 558 | int r; |
| 559 | |
| 560 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 560, __PRETTY_FUNCTION__); } while (0); |
| 561 | assert(address != INADDR_ANY)do { if ((__builtin_expect(!!(!(address != ((in_addr_t) 0x00000000 ))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("address != INADDR_ANY" ), "../src/libsystemd-network/sd-dhcp-server.c", 561, __PRETTY_FUNCTION__ ); } while (0); |
| 562 | assert(chaddr)do { if ((__builtin_expect(!!(!(chaddr)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("chaddr"), "../src/libsystemd-network/sd-dhcp-server.c" , 562, __PRETTY_FUNCTION__); } while (0); |
| 563 | |
| 564 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE)(calloc(1, (sizeof(DHCPPacket) + (576 - (int32_t)(sizeof(struct udphdr) + (int32_t)(sizeof(struct iphdr))) - (int32_t)(sizeof (DHCPMessage)))))); |
| 565 | if (!packet) |
| 566 | return -ENOMEM12; |
| 567 | |
| 568 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, |
| 569 | DHCP_FORCERENEW, ARPHRD_ETHER1, |
| 570 | DHCP_MIN_OPTIONS_SIZE(576 - (int32_t)(sizeof(struct udphdr) + (int32_t)(sizeof(struct iphdr))) - (int32_t)(sizeof(DHCPMessage))), &optoffset); |
| 571 | if (r < 0) |
| 572 | return r; |
| 573 | |
| 574 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE(576 - (int32_t)(sizeof(struct udphdr) + (int32_t)(sizeof(struct iphdr))) - (int32_t)(sizeof(DHCPMessage))), |
| 575 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL((void*)0)); |
| 576 | if (r < 0) |
| 577 | return r; |
| 578 | |
| 579 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN6); |
| 580 | |
| 581 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
| 582 | &packet->dhcp, |
| 583 | sizeof(DHCPMessage) + optoffset); |
| 584 | if (r < 0) |
| 585 | return r; |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
| 591 | DHCPRequest *req = userdata; |
| 592 | |
| 593 | assert(req)do { if ((__builtin_expect(!!(!(req)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("req"), "../src/libsystemd-network/sd-dhcp-server.c" , 593, __PRETTY_FUNCTION__); } while (0); |
| 594 | |
| 595 | switch(code) { |
| 596 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
| 597 | if (len == 4) |
| 598 | req->lifetime = unaligned_read_be32(option); |
| 599 | |
| 600 | break; |
| 601 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
| 602 | if (len == 4) |
| 603 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
| 604 | |
| 605 | break; |
| 606 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
| 607 | if (len == 4) |
| 608 | memcpy(&req->server_id, option, sizeof(be32_t)); |
| 609 | |
| 610 | break; |
| 611 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
| 612 | if (len >= 2) { |
| 613 | uint8_t *data; |
| 614 | |
| 615 | data = memdup(option, len); |
| 616 | if (!data) |
| 617 | return -ENOMEM12; |
| 618 | |
| 619 | free(req->client_id.data); |
| 620 | req->client_id.data = data; |
| 621 | req->client_id.length = len; |
| 622 | } |
| 623 | |
| 624 | break; |
| 625 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
| 626 | |
| 627 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) |
| 628 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
| 629 | |
| 630 | break; |
| 631 | } |
| 632 | |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | static void dhcp_request_free(DHCPRequest *req) { |
| 637 | if (!req) |
| 638 | return; |
| 639 | |
| 640 | free(req->client_id.data); |
| 641 | free(req); |
| 642 | } |
| 643 | |
| 644 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free)static inline void dhcp_request_freep(DHCPRequest* *p) { if ( *p) dhcp_request_free(*p); }; |
| 645 | |
| 646 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
| 647 | assert(req)do { if ((__builtin_expect(!!(!(req)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("req"), "../src/libsystemd-network/sd-dhcp-server.c" , 647, __PRETTY_FUNCTION__); } while (0); |
| 648 | assert(message)do { if ((__builtin_expect(!!(!(message)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("message"), "../src/libsystemd-network/sd-dhcp-server.c" , 648, __PRETTY_FUNCTION__); } while (0); |
| 649 | |
| 650 | req->message = message; |
| 651 | |
| 652 | /* set client id based on MAC address if client did not send an explicit |
| 653 | one */ |
| 654 | if (!req->client_id.data) { |
| 655 | void *data; |
| 656 | |
| 657 | data = malloc0(ETH_ALEN + 1)(calloc(1, (6 + 1))); |
| 658 | if (!data) |
| 659 | return -ENOMEM12; |
| 660 | |
| 661 | ((uint8_t*) data)[0] = 0x01; |
| 662 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN6); |
| 663 | |
| 664 | req->client_id.length = ETH_ALEN6 + 1; |
| 665 | req->client_id.data = data; |
| 666 | } |
| 667 | |
| 668 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE(576 - (int32_t)(sizeof(struct udphdr) + (int32_t)(sizeof(struct iphdr))) - (int32_t)(sizeof(DHCPMessage)))) |
| 669 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE(576 - (int32_t)(sizeof(struct udphdr) + (int32_t)(sizeof(struct iphdr))) - (int32_t)(sizeof(DHCPMessage))); |
| 670 | |
| 671 | if (req->lifetime <= 0) |
| 672 | req->lifetime = MAX(1ULL, server->default_lease_time)__extension__ ({ const typeof((1ULL)) __unique_prefix_A10 = ( (1ULL)); const typeof((server->default_lease_time)) __unique_prefix_B11 = ((server->default_lease_time)); __unique_prefix_A10 > __unique_prefix_B11 ? __unique_prefix_A10 : __unique_prefix_B11 ; }); |
| 673 | |
| 674 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) |
| 675 | req->lifetime = server->max_lease_time; |
| 676 | |
| 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
| 681 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 681, __PRETTY_FUNCTION__); } while (0); |
| 682 | |
| 683 | if (!server->pool_size) |
| 684 | return -EINVAL22; |
| 685 | |
| 686 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
| 687 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) |
| 688 | return -ERANGE34; |
| 689 | |
| 690 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
| 691 | } |
| 692 | |
| 693 | #define HASH_KEY((const sd_id128_t) { .bytes = { 0x0d, 0x1d, 0xfe, 0xbd, 0xf1 , 0x24, 0xbd, 0xb3, 0x47, 0xf1, 0xdd, 0x6e, 0x73, 0x21, 0x93, 0x30 }}) SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30)((const sd_id128_t) { .bytes = { 0x0d, 0x1d, 0xfe, 0xbd, 0xf1 , 0x24, 0xbd, 0xb3, 0x47, 0xf1, 0xdd, 0x6e, 0x73, 0x21, 0x93, 0x30 }}) |
| 694 | |
| 695 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
| 696 | size_t length) { |
| 697 | _cleanup_(dhcp_request_freep)__attribute__((cleanup(dhcp_request_freep))) DHCPRequest *req = NULL((void*)0); |
| 698 | _cleanup_free___attribute__((cleanup(freep))) char *error_message = NULL((void*)0); |
| 699 | DHCPLease *existing_lease; |
| 700 | int type, r; |
| 701 | |
| 702 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 702, __PRETTY_FUNCTION__); } while (0); |
| 703 | assert(message)do { if ((__builtin_expect(!!(!(message)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("message"), "../src/libsystemd-network/sd-dhcp-server.c" , 703, __PRETTY_FUNCTION__); } while (0); |
| 704 | |
| 705 | if (message->op != BOOTREQUEST || |
| 706 | message->htype != ARPHRD_ETHER1 || |
| 707 | message->hlen != ETHER_ADDR_LEN6) |
| 708 | return 0; |
| 709 | |
| 710 | req = new0(DHCPRequest, 1)((DHCPRequest*) calloc((1), sizeof(DHCPRequest))); |
| 711 | if (!req) |
| 712 | return -ENOMEM12; |
| 713 | |
| 714 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
| 715 | if (type < 0) |
| 716 | return 0; |
| 717 | |
| 718 | r = ensure_sane_request(server, req, message); |
| 719 | if (r < 0) |
| 720 | /* this only fails on critical errors */ |
| 721 | return r; |
| 722 | |
| 723 | existing_lease = hashmap_get(server->leases_by_client_id, |
| 724 | &req->client_id); |
| 725 | |
| 726 | switch(type) { |
| 727 | |
| 728 | case DHCP_DISCOVER: { |
| 729 | be32_t address = INADDR_ANY((in_addr_t) 0x00000000); |
| 730 | unsigned i; |
| 731 | |
| 732 | log_dhcp_server(server, "DISCOVER (0x%x)",log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 733, __func__ , "DHCP SERVER: " "DISCOVER (0x%x)", be32toh(req->message-> xid)) |
| 733 | be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 733, __func__ , "DHCP SERVER: " "DISCOVER (0x%x)", be32toh(req->message-> xid)); |
| 734 | |
| 735 | if (!server->pool_size) |
| 736 | /* no pool allocated */ |
| 737 | return 0; |
| 738 | |
| 739 | /* for now pick a random free address from the pool */ |
| 740 | if (existing_lease) |
| 741 | address = existing_lease->address; |
| 742 | else { |
| 743 | struct siphash state; |
| 744 | uint64_t hash; |
| 745 | uint32_t next_offer; |
| 746 | |
| 747 | /* even with no persistence of leases, we try to offer the same client |
| 748 | the same IP address. we do this by using the hash of the client id |
| 749 | as the offset into the pool of leases when finding the next free one */ |
| 750 | |
| 751 | siphash24_init(&state, HASH_KEY((const sd_id128_t) { .bytes = { 0x0d, 0x1d, 0xfe, 0xbd, 0xf1 , 0x24, 0xbd, 0xb3, 0x47, 0xf1, 0xdd, 0x6e, 0x73, 0x21, 0x93, 0x30 }}).bytes); |
| 752 | client_id_hash_func(&req->client_id, &state); |
| 753 | hash = htole64(siphash24_finalize(&state)); |
| 754 | next_offer = hash % server->pool_size; |
| 755 | |
| 756 | for (i = 0; i < server->pool_size; i++) { |
| 757 | if (!server->bound_leases[next_offer]) { |
| 758 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
| 759 | break; |
| 760 | } |
| 761 | |
| 762 | next_offer = (next_offer + 1) % server->pool_size; |
| 763 | } |
| 764 | } |
| 765 | |
| 766 | if (address == INADDR_ANY((in_addr_t) 0x00000000)) |
| 767 | /* no free addresses left */ |
| 768 | return 0; |
| 769 | |
| 770 | r = server_send_offer(server, req, address); |
| 771 | if (r < 0) |
| 772 | /* this only fails on critical errors */ |
| 773 | return log_dhcp_server_errno(server, r, "Could not send offer: %m")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), r, "../src/libsystemd-network/sd-dhcp-server.c", 773, __func__ , "DHCP SERVER: " "Could not send offer: %m"); |
| 774 | |
| 775 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 775, __func__ , "DHCP SERVER: " "OFFER (0x%x)", be32toh(req->message-> xid)); |
| 776 | return DHCP_OFFER; |
| 777 | } |
| 778 | case DHCP_DECLINE: |
| 779 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 779, __func__ , "DHCP SERVER: " "DECLINE (0x%x): %s", be32toh(req->message ->xid), strna(error_message)); |
| 780 | |
| 781 | /* TODO: make sure we don't offer this address again */ |
| 782 | |
| 783 | return 1; |
| 784 | |
| 785 | case DHCP_REQUEST: { |
| 786 | be32_t address; |
| 787 | bool_Bool init_reboot = false0; |
| 788 | int pool_offset; |
| 789 | |
| 790 | /* see RFC 2131, section 4.3.2 */ |
| 791 | |
| 792 | if (req->server_id) { |
| 793 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)",log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 794, __func__ , "DHCP SERVER: " "REQUEST (selecting) (0x%x)", be32toh(req-> message->xid)) |
| 794 | be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 794, __func__ , "DHCP SERVER: " "REQUEST (selecting) (0x%x)", be32toh(req-> message->xid)); |
| 795 | |
| 796 | /* SELECTING */ |
| 797 | if (req->server_id != server->address) |
| 798 | /* client did not pick us */ |
| 799 | return 0; |
| 800 | |
| 801 | if (req->message->ciaddr) |
| 802 | /* this MUST be zero */ |
| 803 | return 0; |
| 804 | |
| 805 | if (!req->requested_ip) |
| 806 | /* this must be filled in with the yiaddr |
| 807 | from the chosen OFFER */ |
| 808 | return 0; |
| 809 | |
| 810 | address = req->requested_ip; |
| 811 | } else if (req->requested_ip) { |
| 812 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)",log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 813, __func__ , "DHCP SERVER: " "REQUEST (init-reboot) (0x%x)", be32toh(req ->message->xid)) |
| 813 | be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 813, __func__ , "DHCP SERVER: " "REQUEST (init-reboot) (0x%x)", be32toh(req ->message->xid)); |
| 814 | |
| 815 | /* INIT-REBOOT */ |
| 816 | if (req->message->ciaddr) |
| 817 | /* this MUST be zero */ |
| 818 | return 0; |
| 819 | |
| 820 | /* TODO: check more carefully if IP is correct */ |
| 821 | address = req->requested_ip; |
| 822 | init_reboot = true1; |
| 823 | } else { |
| 824 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)",log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 825, __func__ , "DHCP SERVER: " "REQUEST (rebinding/renewing) (0x%x)", be32toh (req->message->xid)) |
| 825 | be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 825, __func__ , "DHCP SERVER: " "REQUEST (rebinding/renewing) (0x%x)", be32toh (req->message->xid)); |
| 826 | |
| 827 | /* REBINDING / RENEWING */ |
| 828 | if (!req->message->ciaddr) |
| 829 | /* this MUST be filled in with clients IP address */ |
| 830 | return 0; |
| 831 | |
| 832 | address = req->message->ciaddr; |
| 833 | } |
| 834 | |
| 835 | pool_offset = get_pool_offset(server, address); |
| 836 | |
| 837 | /* verify that the requested address is from the pool, and either |
| 838 | owned by the current client or free */ |
| 839 | if (pool_offset >= 0 && |
| 840 | server->bound_leases[pool_offset] == existing_lease) { |
| 841 | DHCPLease *lease; |
| 842 | usec_t time_now = 0; |
| 843 | |
| 844 | if (!existing_lease) { |
| 845 | lease = new0(DHCPLease, 1)((DHCPLease*) calloc((1), sizeof(DHCPLease))); |
| 846 | if (!lease) |
| 847 | return -ENOMEM12; |
| 848 | lease->address = address; |
| 849 | lease->client_id.data = memdup(req->client_id.data, |
| 850 | req->client_id.length); |
| 851 | if (!lease->client_id.data) { |
| 852 | free(lease); |
| 853 | return -ENOMEM12; |
| 854 | } |
| 855 | lease->client_id.length = req->client_id.length; |
| 856 | memcpy(&lease->chaddr, &req->message->chaddr, |
| 857 | ETH_ALEN6); |
| 858 | lease->gateway = req->message->giaddr; |
| 859 | } else |
| 860 | lease = existing_lease; |
| 861 | |
| 862 | r = sd_event_now(server->event, |
| 863 | clock_boottime_or_monotonic(), |
| 864 | &time_now); |
| 865 | if (r < 0) { |
| 866 | if (!existing_lease) |
| 867 | dhcp_lease_free(lease); |
| 868 | return r; |
| 869 | } |
| 870 | |
| 871 | lease->expiration = req->lifetime * USEC_PER_SEC((usec_t) 1000000ULL) + time_now; |
| 872 | |
| 873 | r = server_send_ack(server, req, address); |
| 874 | if (r < 0) { |
| 875 | /* this only fails on critical errors */ |
| 876 | log_dhcp_server_errno(server, r, "Could not send ack: %m")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), r, "../src/libsystemd-network/sd-dhcp-server.c", 876, __func__ , "DHCP SERVER: " "Could not send ack: %m"); |
| 877 | |
| 878 | if (!existing_lease) |
| 879 | dhcp_lease_free(lease); |
| 880 | |
| 881 | return r; |
| 882 | } else { |
| 883 | log_dhcp_server(server, "ACK (0x%x)",log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 884, __func__ , "DHCP SERVER: " "ACK (0x%x)", be32toh(req->message->xid )) |
| 884 | be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 884, __func__ , "DHCP SERVER: " "ACK (0x%x)", be32toh(req->message->xid )); |
| 885 | |
| 886 | server->bound_leases[pool_offset] = lease; |
| 887 | hashmap_put(server->leases_by_client_id, |
| 888 | &lease->client_id, lease); |
| 889 | |
| 890 | return DHCP_ACK; |
| 891 | } |
| 892 | |
| 893 | } else if (init_reboot) { |
| 894 | r = server_send_nak(server, req); |
| 895 | if (r < 0) |
| 896 | /* this only fails on critical errors */ |
| 897 | return log_dhcp_server_errno(server, r, "Could not send nak: %m")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), r, "../src/libsystemd-network/sd-dhcp-server.c", 897, __func__ , "DHCP SERVER: " "Could not send nak: %m"); |
| 898 | |
| 899 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 899, __func__ , "DHCP SERVER: " "NAK (0x%x)", be32toh(req->message->xid )); |
| 900 | return DHCP_NAK; |
| 901 | } |
| 902 | |
| 903 | break; |
| 904 | } |
| 905 | |
| 906 | case DHCP_RELEASE: { |
| 907 | int pool_offset; |
| 908 | |
| 909 | log_dhcp_server(server, "RELEASE (0x%x)",log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 910, __func__ , "DHCP SERVER: " "RELEASE (0x%x)", be32toh(req->message-> xid)) |
| 910 | be32toh(req->message->xid))log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 910, __func__ , "DHCP SERVER: " "RELEASE (0x%x)", be32toh(req->message-> xid)); |
| 911 | |
| 912 | if (!existing_lease) |
| 913 | return 0; |
| 914 | |
| 915 | if (existing_lease->address != req->message->ciaddr) |
| 916 | return 0; |
| 917 | |
| 918 | pool_offset = get_pool_offset(server, req->message->ciaddr); |
| 919 | if (pool_offset < 0) |
| 920 | return 0; |
| 921 | |
| 922 | if (server->bound_leases[pool_offset] == existing_lease) { |
| 923 | server->bound_leases[pool_offset] = NULL((void*)0); |
| 924 | hashmap_remove(server->leases_by_client_id, existing_lease); |
| 925 | dhcp_lease_free(existing_lease); |
| 926 | } |
| 927 | |
| 928 | return 0; |
| 929 | }} |
| 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static int server_receive_message(sd_event_source *s, int fd, |
| 935 | uint32_t revents, void *userdata) { |
| 936 | _cleanup_free___attribute__((cleanup(freep))) DHCPMessage *message = NULL((void*)0); |
| 937 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))((((sizeof (struct cmsghdr)) + sizeof (size_t) - 1) & (size_t ) ~(sizeof (size_t) - 1)) + (sizeof(struct in_pktinfo)))]; |
| 938 | sd_dhcp_server *server = userdata; |
| 939 | struct iovec iov = {}; |
| 940 | struct msghdr msg = { |
| 941 | .msg_iov = &iov, |
| 942 | .msg_iovlen = 1, |
| 943 | .msg_control = cmsgbuf, |
| 944 | .msg_controllen = sizeof(cmsgbuf), |
| 945 | }; |
| 946 | struct cmsghdr *cmsg; |
| 947 | ssize_t buflen, len; |
| 948 | int r; |
| 949 | |
| 950 | assert(server)do { if ((__builtin_expect(!!(!(server)),0))) log_assert_failed_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 950, __PRETTY_FUNCTION__); } while (0); |
| 951 | |
| 952 | buflen = next_datagram_size_fd(fd); |
| 953 | if (buflen < 0) |
| 954 | return buflen; |
| 955 | |
| 956 | message = malloc(buflen); |
| 957 | if (!message) |
| 958 | return -ENOMEM12; |
| 959 | |
| 960 | iov.iov_base = message; |
| 961 | iov.iov_len = buflen; |
| 962 | |
| 963 | len = recvmsg(fd, &msg, 0); |
| 964 | if (len < 0) { |
| 965 | if (IN_SET(errno, EAGAIN, EINTR)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended [20 - sizeof((int[]){11, 4})/sizeof(int)]; switch((*__errno_location ())) { case 11: case 4: _found = 1; break; default: break; } _found; })) |
| 966 | return 0; |
| 967 | |
| 968 | return -errno(*__errno_location ()); |
| 969 | } |
| 970 | if ((size_t)len < sizeof(DHCPMessage)) |
| 971 | return 0; |
| 972 | |
| 973 | CMSG_FOREACH(cmsg, &msg)for ((cmsg) = ((size_t) (&msg)->msg_controllen >= sizeof (struct cmsghdr) ? (struct cmsghdr *) (&msg)->msg_control : (struct cmsghdr *) 0); (cmsg); (cmsg) = __cmsg_nxthdr ((& msg), (cmsg))) { |
| 974 | if (cmsg->cmsg_level == IPPROTO_IPIPPROTO_IP && |
| 975 | cmsg->cmsg_type == IP_PKTINFO8 && |
| 976 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))((((sizeof (struct cmsghdr)) + sizeof (size_t) - 1) & (size_t ) ~(sizeof (size_t) - 1)) + (sizeof(struct in_pktinfo)))) { |
| 977 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg)((cmsg)->__cmsg_data); |
| 978 | |
| 979 | /* TODO figure out if this can be done as a filter on |
| 980 | * the socket, like for IPv6 */ |
| 981 | if (server->ifindex != info->ipi_ifindex) |
| 982 | return 0; |
| 983 | |
| 984 | break; |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | r = dhcp_server_handle_message(server, message, (size_t) len); |
| 989 | if (r < 0) |
| 990 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), r, "../src/libsystemd-network/sd-dhcp-server.c", 990, __func__ , "DHCP SERVER: " "Couldn't process incoming message: %m"); |
| 991 | |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | int sd_dhcp_server_start(sd_dhcp_server *server) { |
| 996 | int r; |
| 997 | |
| 998 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 998, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 999 | assert_return(server->event, -EINVAL)do { if (!(((__builtin_expect(!!(server->event),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("server->event" ), "../src/libsystemd-network/sd-dhcp-server.c", 999, __PRETTY_FUNCTION__ ), 0))) return (-22); } while (0); |
| 1000 | assert_return(!server->receive_message, -EBUSY)do { if (!(((__builtin_expect(!!(!server->receive_message) ,1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD , ("!server->receive_message"), "../src/libsystemd-network/sd-dhcp-server.c" , 1000, __PRETTY_FUNCTION__), 0))) return (-16); } while (0); |
| 1001 | assert_return(server->fd_raw < 0, -EBUSY)do { if (!(((__builtin_expect(!!(server->fd_raw < 0),1) )) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("server->fd_raw < 0"), "../src/libsystemd-network/sd-dhcp-server.c" , 1001, __PRETTY_FUNCTION__), 0))) return (-16); } while (0); |
| 1002 | assert_return(server->fd < 0, -EBUSY)do { if (!(((__builtin_expect(!!(server->fd < 0),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("server->fd < 0" ), "../src/libsystemd-network/sd-dhcp-server.c", 1002, __PRETTY_FUNCTION__ ), 0))) return (-16); } while (0); |
| 1003 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH)do { if (!(((__builtin_expect(!!(server->address != htobe32 (((in_addr_t) 0x00000000))),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server->address != htobe32(INADDR_ANY)" ), "../src/libsystemd-network/sd-dhcp-server.c", 1003, __PRETTY_FUNCTION__ ), 0))) return (-49); } while (0); |
| 1004 | |
| 1005 | r = socket(AF_PACKET17, SOCK_DGRAMSOCK_DGRAM | SOCK_NONBLOCKSOCK_NONBLOCK, 0); |
| 1006 | if (r < 0) { |
| 1007 | r = -errno(*__errno_location ()); |
| 1008 | sd_dhcp_server_stop(server); |
| 1009 | return r; |
| 1010 | } |
| 1011 | server->fd_raw = r; |
| 1012 | |
| 1013 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY((in_addr_t) 0x00000000), DHCP_PORT_SERVER); |
| 1014 | if (r < 0) { |
| 1015 | sd_dhcp_server_stop(server); |
| 1016 | return r; |
| 1017 | } |
| 1018 | server->fd = r; |
| 1019 | |
| 1020 | r = sd_event_add_io(server->event, &server->receive_message, |
| 1021 | server->fd, EPOLLINEPOLLIN, |
| 1022 | server_receive_message, server); |
| 1023 | if (r < 0) { |
| 1024 | sd_dhcp_server_stop(server); |
| 1025 | return r; |
| 1026 | } |
| 1027 | |
| 1028 | r = sd_event_source_set_priority(server->receive_message, |
| 1029 | server->event_priority); |
| 1030 | if (r < 0) { |
| 1031 | sd_dhcp_server_stop(server); |
| 1032 | return r; |
| 1033 | } |
| 1034 | |
| 1035 | log_dhcp_server(server, "STARTED")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 1035, __func__ , "DHCP SERVER: " "STARTED"); |
| 1036 | |
| 1037 | return 0; |
| 1038 | } |
| 1039 | |
| 1040 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { |
| 1041 | unsigned i; |
| 1042 | int r = 0; |
| 1043 | |
| 1044 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1044, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1045 | assert(server->bound_leases)do { if ((__builtin_expect(!!(!(server->bound_leases)),0)) ) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("server->bound_leases" ), "../src/libsystemd-network/sd-dhcp-server.c", 1045, __PRETTY_FUNCTION__ ); } while (0); |
| 1046 | |
| 1047 | for (i = 0; i < server->pool_size; i++) { |
| 1048 | DHCPLease *lease = server->bound_leases[i]; |
| 1049 | |
| 1050 | if (!lease || lease == &server->invalid_lease) |
| 1051 | continue; |
| 1052 | |
| 1053 | r = server_send_forcerenew(server, lease->address, |
| 1054 | lease->gateway, |
| 1055 | lease->chaddr); |
| 1056 | if (r < 0) |
| 1057 | return r; |
| 1058 | |
| 1059 | log_dhcp_server(server, "FORCERENEW")log_internal_realm(((LOG_REALM_SYSTEMD) << 10 | ((7))), 0, "../src/libsystemd-network/sd-dhcp-server.c", 1059, __func__ , "DHCP SERVER: " "FORCERENEW"); |
| 1060 | } |
| 1061 | |
| 1062 | return r; |
| 1063 | } |
| 1064 | |
| 1065 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
| 1066 | int r; |
| 1067 | |
| 1068 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1068, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1069 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL)do { if (!(((__builtin_expect(!!(timezone_is_valid(tz, 7)),1) )) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("timezone_is_valid(tz, LOG_DEBUG)"), "../src/libsystemd-network/sd-dhcp-server.c" , 1069, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1070 | |
| 1071 | if (streq_ptr(tz, server->timezone)) |
| 1072 | return 0; |
| 1073 | |
| 1074 | r = free_and_strdup(&server->timezone, tz); |
| 1075 | if (r < 0) |
| 1076 | return r; |
| 1077 | |
| 1078 | return 1; |
| 1079 | } |
| 1080 | |
| 1081 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { |
| 1082 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1082, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1083 | |
| 1084 | if (t == server->max_lease_time) |
| 1085 | return 0; |
| 1086 | |
| 1087 | server->max_lease_time = t; |
| 1088 | return 1; |
| 1089 | } |
| 1090 | |
| 1091 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { |
| 1092 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1092, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1093 | |
| 1094 | if (t == server->default_lease_time) |
| 1095 | return 0; |
| 1096 | |
| 1097 | server->default_lease_time = t; |
| 1098 | return 1; |
| 1099 | } |
| 1100 | |
| 1101 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { |
| 1102 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1102, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1103 | assert_return(dns || n <= 0, -EINVAL)do { if (!(((__builtin_expect(!!(dns || n <= 0),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("dns || n <= 0" ), "../src/libsystemd-network/sd-dhcp-server.c", 1103, __PRETTY_FUNCTION__ ), 0))) return (-22); } while (0); |
| 1104 | |
| 1105 | if (server->n_dns == n && |
| 1106 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) |
| 1107 | return 0; |
| 1108 | |
| 1109 | if (n <= 0) { |
| 1110 | server->dns = mfree(server->dns); |
| 1111 | server->n_dns = 0; |
| 1112 | } else { |
| 1113 | struct in_addr *c; |
| 1114 | |
| 1115 | c = newdup(struct in_addr, dns, n)((struct in_addr*) memdup_multiply(dns, sizeof(struct in_addr ), (n))); |
| 1116 | if (!c) |
| 1117 | return -ENOMEM12; |
| 1118 | |
| 1119 | free(server->dns); |
| 1120 | server->dns = c; |
| 1121 | server->n_dns = n; |
| 1122 | } |
| 1123 | |
| 1124 | return 1; |
| 1125 | } |
| 1126 | |
| 1127 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { |
| 1128 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1128, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1129 | assert_return(ntp || n <= 0, -EINVAL)do { if (!(((__builtin_expect(!!(ntp || n <= 0),1))) ? (1) : (log_assert_failed_return_realm(LOG_REALM_SYSTEMD, ("ntp || n <= 0" ), "../src/libsystemd-network/sd-dhcp-server.c", 1129, __PRETTY_FUNCTION__ ), 0))) return (-22); } while (0); |
| 1130 | |
| 1131 | if (server->n_ntp == n && |
| 1132 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) |
| 1133 | return 0; |
| 1134 | |
| 1135 | if (n <= 0) { |
| 1136 | server->ntp = mfree(server->ntp); |
| 1137 | server->n_ntp = 0; |
| 1138 | } else { |
| 1139 | struct in_addr *c; |
| 1140 | |
| 1141 | c = newdup(struct in_addr, ntp, n)((struct in_addr*) memdup_multiply(ntp, sizeof(struct in_addr ), (n))); |
| 1142 | if (!c) |
| 1143 | return -ENOMEM12; |
| 1144 | |
| 1145 | free(server->ntp); |
| 1146 | server->ntp = c; |
| 1147 | server->n_ntp = n; |
| 1148 | } |
| 1149 | |
| 1150 | return 1; |
| 1151 | } |
| 1152 | |
| 1153 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { |
| 1154 | assert_return(server, -EINVAL)do { if (!(((__builtin_expect(!!(server),1))) ? (1) : (log_assert_failed_return_realm (LOG_REALM_SYSTEMD, ("server"), "../src/libsystemd-network/sd-dhcp-server.c" , 1154, __PRETTY_FUNCTION__), 0))) return (-22); } while (0); |
| 1155 | |
| 1156 | if (enabled == server->emit_router) |
| 1157 | return 0; |
| 1158 | |
| 1159 | server->emit_router = enabled; |
| 1160 | |
| 1161 | return 1; |
| 1162 | } |