Bug Summary

File:build-scan/../src/resolve/resolved-dns-query.c
Warning:line 367, column 17
Use of memory after it is freed

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-unknown-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name resolved-dns-query.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -menable-no-infs -menable-no-nans -menable-unsafe-fp-math -fno-signed-zeros -mreassociate -freciprocal-math -fdenormal-fp-math=preserve-sign,preserve-sign -ffp-contract=fast -fno-rounding-math -ffast-math -ffinite-math-only -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib64/clang/12.0.0 -include config.h -I systemd-resolved.p -I . -I .. -I src/basic -I ../src/basic -I src/shared -I ../src/shared -I src/systemd -I ../src/systemd -I src/journal -I ../src/journal -I src/journal-remote -I ../src/journal-remote -I src/nspawn -I ../src/nspawn -I src/resolve -I ../src/resolve -I src/timesync -I ../src/timesync -I ../src/time-wait-sync -I src/login -I ../src/login -I src/udev -I ../src/udev -I src/libudev -I ../src/libudev -I src/core -I ../src/core -I ../src/libsystemd/sd-bus -I ../src/libsystemd/sd-device -I ../src/libsystemd/sd-hwdb -I ../src/libsystemd/sd-id128 -I ../src/libsystemd/sd-netlink -I ../src/libsystemd/sd-network -I src/libsystemd-network -I ../src/libsystemd-network -I /usr/include/p11-kit-1 -D _FILE_OFFSET_BITS=64 -internal-isystem /usr/local/include -internal-isystem /usr/lib64/clang/12.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wwrite-strings -Wno-unused-parameter -Wno-missing-field-initializers -Wno-unused-result -Wno-format-signedness -Wno-error=nonnull -std=gnu99 -fconst-strings -fdebug-compilation-dir /home/mrc0mmand/repos/@redhat-plumbers/systemd-rhel8/build-scan -ferror-limit 19 -fvisibility hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -analyzer-output=html -faddrsig -o /tmp/scan-build-2021-07-16-221226-1465241-1 -x c ../src/resolve/resolved-dns-query.c

../src/resolve/resolved-dns-query.c

→
1/* SPDX-License-Identifier: LGPL-2.1+ */
2
3#include "alloc-util.h"
4#include "dns-domain.h"
5#include "dns-type.h"
6#include "hostname-util.h"
7#include "local-addresses.h"
8#include "resolved-dns-query.h"
9#include "resolved-dns-synthesize.h"
10#include "resolved-etc-hosts.h"
11#include "string-util.h"
12
13#define CNAME_MAX8 8
14#define QUERIES_MAX2048 2048
15#define AUXILIARY_QUERIES_MAX64 64
16
17static int dns_query_candidate_new(DnsQueryCandidate **ret, DnsQuery *q, DnsScope *s) {
18 DnsQueryCandidate *c;
19
20 assert(ret)do { if ((__builtin_expect(!!(!(ret)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("ret"), "../src/resolve/resolved-dns-query.c"
, 20, __PRETTY_FUNCTION__); } while (0);
21 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 21, __PRETTY_FUNCTION__); } while (0);
22 assert(s)do { if ((__builtin_expect(!!(!(s)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("s"), "../src/resolve/resolved-dns-query.c"
, 22, __PRETTY_FUNCTION__); } while (0);
23
24 c = new0(DnsQueryCandidate, 1)((DnsQueryCandidate*) calloc((1), sizeof(DnsQueryCandidate)));
25 if (!c)
26 return -ENOMEM12;
27
28 c->query = q;
29 c->scope = s;
30
31 LIST_PREPEND(candidates_by_query, q->candidates, c)do { typeof(*(q->candidates)) **_head = &(q->candidates
), *_item = (c); do { if ((__builtin_expect(!!(!(_item)),0)))
log_assert_failed_realm(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-query.c"
, 31, __PRETTY_FUNCTION__); } while (0); if ((_item->candidates_by_query_next
= *_head)) _item->candidates_by_query_next->candidates_by_query_prev
= _item; _item->candidates_by_query_prev = ((void*)0); *_head
= _item; } while (0);
32 LIST_PREPEND(candidates_by_scope, s->query_candidates, c)do { typeof(*(s->query_candidates)) **_head = &(s->
query_candidates), *_item = (c); do { if ((__builtin_expect(!
!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, (
"_item"), "../src/resolve/resolved-dns-query.c", 32, __PRETTY_FUNCTION__
); } while (0); if ((_item->candidates_by_scope_next = *_head
)) _item->candidates_by_scope_next->candidates_by_scope_prev
= _item; _item->candidates_by_scope_prev = ((void*)0); *_head
= _item; } while (0);
33
34 *ret = c;
35 return 0;
36}
37
38static void dns_query_candidate_stop(DnsQueryCandidate *c) {
39 DnsTransaction *t;
40
41 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 41, __PRETTY_FUNCTION__); } while (0);
42
43 while ((t = set_steal_first(c->transactions))) {
44 set_remove(t->notify_query_candidates, c);
45 set_remove(t->notify_query_candidates_done, c);
46 dns_transaction_gc(t);
47 }
48}
49
50DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c) {
51
52 if (!c)
53 return NULL((void*)0);
54
55 dns_query_candidate_stop(c);
56
57 set_free(c->transactions);
58 dns_search_domain_unref(c->search_domain);
59
60 if (c->query)
61 LIST_REMOVE(candidates_by_query, c->query->candidates, c)do { typeof(*(c->query->candidates)) **_head = &(c->
query->candidates), *_item = (c); do { if ((__builtin_expect
(!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD,
("_item"), "../src/resolve/resolved-dns-query.c", 61, __PRETTY_FUNCTION__
); } while (0); if (_item->candidates_by_query_next) _item
->candidates_by_query_next->candidates_by_query_prev = _item
->candidates_by_query_prev; if (_item->candidates_by_query_prev
) _item->candidates_by_query_prev->candidates_by_query_next
= _item->candidates_by_query_next; else { do { if ((__builtin_expect
(!!(!(*_head == _item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD
, ("*_head == _item"), "../src/resolve/resolved-dns-query.c",
61, __PRETTY_FUNCTION__); } while (0); *_head = _item->candidates_by_query_next
; } _item->candidates_by_query_next = _item->candidates_by_query_prev
= ((void*)0); } while (0);
62
63 if (c->scope)
64 LIST_REMOVE(candidates_by_scope, c->scope->query_candidates, c)do { typeof(*(c->scope->query_candidates)) **_head = &
(c->scope->query_candidates), *_item = (c); do { if ((__builtin_expect
(!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD,
("_item"), "../src/resolve/resolved-dns-query.c", 64, __PRETTY_FUNCTION__
); } while (0); if (_item->candidates_by_scope_next) _item
->candidates_by_scope_next->candidates_by_scope_prev = _item
->candidates_by_scope_prev; if (_item->candidates_by_scope_prev
) _item->candidates_by_scope_prev->candidates_by_scope_next
= _item->candidates_by_scope_next; else { do { if ((__builtin_expect
(!!(!(*_head == _item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD
, ("*_head == _item"), "../src/resolve/resolved-dns-query.c",
64, __PRETTY_FUNCTION__); } while (0); *_head = _item->candidates_by_scope_next
; } _item->candidates_by_scope_next = _item->candidates_by_scope_prev
= ((void*)0); } while (0);
65
66 return mfree(c);
67}
68
69static int dns_query_candidate_next_search_domain(DnsQueryCandidate *c) {
70 DnsSearchDomain *next = NULL((void*)0);
71
72 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 72, __PRETTY_FUNCTION__); } while (0);
73
74 if (c->search_domain && c->search_domain->linked)
75 next = c->search_domain->domains_next;
76 else
77 next = dns_scope_get_search_domains(c->scope);
78
79 for (;;) {
80 if (!next) /* We hit the end of the list */
81 return 0;
82
83 if (!next->route_only)
84 break;
85
86 /* Skip over route-only domains */
87 next = next->domains_next;
88 }
89
90 dns_search_domain_unref(c->search_domain);
91 c->search_domain = dns_search_domain_ref(next);
92
93 return 1;
94}
95
96static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResourceKey *key) {
97 DnsTransaction *t;
98 int r;
99
100 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 100, __PRETTY_FUNCTION__); } while (0);
101 assert(key)do { if ((__builtin_expect(!!(!(key)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("key"), "../src/resolve/resolved-dns-query.c"
, 101, __PRETTY_FUNCTION__); } while (0);
102
103 t = dns_scope_find_transaction(c->scope, key, true1);
104 if (!t) {
105 r = dns_transaction_new(&t, c->scope, key);
106 if (r < 0)
107 return r;
108 } else {
109 if (set_contains(c->transactions, t))
110 return 0;
111 }
112
113 r = set_ensure_allocated(&c->transactions, NULL)internal_set_ensure_allocated(&c->transactions, ((void
*)0) );
114 if (r < 0)
115 goto gc;
116
117 r = set_ensure_allocated(&t->notify_query_candidates, NULL)internal_set_ensure_allocated(&t->notify_query_candidates
, ((void*)0) );
118 if (r < 0)
119 goto gc;
120
121 r = set_ensure_allocated(&t->notify_query_candidates_done, NULL)internal_set_ensure_allocated(&t->notify_query_candidates_done
, ((void*)0) );
122 if (r < 0)
123 goto gc;
124
125 r = set_put(t->notify_query_candidates, c);
126 if (r < 0)
127 goto gc;
128
129 r = set_put(c->transactions, t);
130 if (r < 0) {
131 (void) set_remove(t->notify_query_candidates, c);
132 goto gc;
133 }
134
135 t->clamp_ttl = c->query->clamp_ttl;
136 return 1;
137
138gc:
139 dns_transaction_gc(t);
140 return r;
141}
142
143static int dns_query_candidate_go(DnsQueryCandidate *c) {
144 DnsTransaction *t;
145 Iterator i;
146 int r;
147 unsigned n = 0;
148
149 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 149, __PRETTY_FUNCTION__); } while (0);
150
151 /* Start the transactions that are not started yet */
152 SET_FOREACH(t, c->transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), .
next_key = ((void*)0) }); set_iterate((c->transactions), &
(i), (void**)&(t)); ) {
153 if (t->state != DNS_TRANSACTION_NULL)
154 continue;
155
156 r = dns_transaction_go(t);
157 if (r < 0)
158 return r;
159
160 n++;
161 }
162
163 /* If there was nothing to start, then let's proceed immediately */
164 if (n == 0)
165 dns_query_candidate_notify(c);
166
167 return 0;
168}
169
170static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) {
171 DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
172 DnsTransaction *t;
173 Iterator i;
174
175 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 175, __PRETTY_FUNCTION__); } while (0);
176
177 if (c->error_code != 0)
178 return DNS_TRANSACTION_ERRNO;
179
180 SET_FOREACH(t, c->transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), .
next_key = ((void*)0) }); set_iterate((c->transactions), &
(i), (void**)&(t)); ) {
181
182 switch (t->state) {
183
184 case DNS_TRANSACTION_NULL:
185 /* If there's a NULL transaction pending, then
186 * this means not all transactions where
187 * started yet, and we were called from within
188 * the stackframe that is supposed to start
189 * remaining transactions. In this case,
190 * simply claim the candidate is pending. */
191
192 case DNS_TRANSACTION_PENDING:
193 case DNS_TRANSACTION_VALIDATING:
194 /* If there's one transaction currently in
195 * VALIDATING state, then this means there's
196 * also one in PENDING state, hence we can
197 * return PENDING immediately. */
198 return DNS_TRANSACTION_PENDING;
199
200 case DNS_TRANSACTION_SUCCESS:
201 state = t->state;
202 break;
203
204 default:
205 if (state != DNS_TRANSACTION_SUCCESS)
206 state = t->state;
207
208 break;
209 }
210 }
211
212 return state;
213}
214
215static bool_Bool dns_query_candidate_is_routable(DnsQueryCandidate *c, uint16_t type) {
216 int family;
217
218 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 218, __PRETTY_FUNCTION__); } while (0);
219
220 /* Checks whether the specified RR type matches an address family that is routable on the link(s) the scope of
221 * this candidate belongs to. Specifically, whether there's a routable IPv4 address on it if we query an A RR,
222 * or a routable IPv6 address if we query an AAAA RR. */
223
224 if (!c->query->suppress_unroutable_family)
225 return true1;
226
227 if (c->scope->protocol != DNS_PROTOCOL_DNS)
228 return true1;
229
230 family = dns_type_to_af(type);
231 if (family < 0)
232 return true1;
233
234 if (c->scope->link)
235 return link_relevant(c->scope->link, family, false0);
236 else
237 return manager_routable(c->scope->manager, family);
238}
239
240static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) {
241 DnsQuestion *question;
242 DnsResourceKey *key;
243 int n = 0, r;
244
245 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 245, __PRETTY_FUNCTION__); } while (0);
246
247 dns_query_candidate_stop(c);
248
249 question = dns_query_question_for_protocol(c->query, c->scope->protocol);
250
251 /* Create one transaction per question key */
252 DNS_QUESTION_FOREACH(key, question)for (size_t __unique_prefix_i13 = ({ (key) = ((question) &&
(question)->n_keys > 0) ? (question)->keys[0] : ((void
*)0); 0; }); (question) && (__unique_prefix_i13 < (
question)->n_keys); __unique_prefix_i13++, (key) = (__unique_prefix_i13
< (question)->n_keys ? (question)->keys[__unique_prefix_i13
] : ((void*)0))) {
253 _cleanup_(dns_resource_key_unrefp)__attribute__((cleanup(dns_resource_key_unrefp))) DnsResourceKey *new_key = NULL((void*)0);
254 DnsResourceKey *qkey;
255
256 if (!dns_query_candidate_is_routable(c, key->type))
257 continue;
258
259 if (c->search_domain) {
260 r = dns_resource_key_new_append_suffix(&new_key, key, c->search_domain->name);
261 if (r < 0)
262 goto fail;
263
264 qkey = new_key;
265 } else
266 qkey = key;
267
268 if (!dns_scope_good_key(c->scope, qkey))
269 continue;
270
271 r = dns_query_candidate_add_transaction(c, qkey);
272 if (r < 0)
273 goto fail;
274
275 n++;
276 }
277
278 return n;
279
280fail:
281 dns_query_candidate_stop(c);
282 return r;
283}
284
285void dns_query_candidate_notify(DnsQueryCandidate *c) {
286 DnsTransactionState state;
287 int r;
288
289 assert(c)do { if ((__builtin_expect(!!(!(c)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("c"), "../src/resolve/resolved-dns-query.c"
, 289, __PRETTY_FUNCTION__); } while (0);
290
291 state = dns_query_candidate_state(c);
292
293 if (DNS_TRANSACTION_IS_LIVE(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((state)) {
case DNS_TRANSACTION_NULL: case DNS_TRANSACTION_PENDING: case
DNS_TRANSACTION_VALIDATING: _found = 1; break; default: break
; } _found; }))
294 return;
295
296 if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) {
297
298 r = dns_query_candidate_next_search_domain(c);
299 if (r < 0)
300 goto fail;
301
302 if (r > 0) {
303 /* OK, there's another search domain to try, let's do so. */
304
305 r = dns_query_candidate_setup_transactions(c);
306 if (r < 0)
307 goto fail;
308
309 if (r > 0) {
310 /* New transactions where queued. Start them and wait */
311
312 r = dns_query_candidate_go(c);
313 if (r < 0)
314 goto fail;
315
316 return;
317 }
318 }
319
320 }
321
322 dns_query_ready(c->query);
323 return;
324
325fail:
326 log_warning_errno(r, "Failed to follow search domains: %m")({ int _level = ((4)), _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-query.c", 326, __func__, "Failed to follow search domains: %m"
) : -abs(_e); });
327 c->error_code = r;
328 dns_query_ready(c->query);
329}
330
331static void dns_query_stop(DnsQuery *q) {
332 DnsQueryCandidate *c;
333
334 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 334, __PRETTY_FUNCTION__); } while (0);
335
336 q->timeout_event_source = sd_event_source_unref(q->timeout_event_source);
337
338 LIST_FOREACH(candidates_by_query, c, q->candidates)for ((c) = (q->candidates); (c); (c) = (c)->candidates_by_query_next
)
339 dns_query_candidate_stop(c);
340}
341
342static void dns_query_free_candidates(DnsQuery *q) {
343 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 343, __PRETTY_FUNCTION__); } while (0);
344
345 while (q->candidates)
346 dns_query_candidate_free(q->candidates);
347}
348
349static void dns_query_reset_answer(DnsQuery *q) {
350 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 350, __PRETTY_FUNCTION__); } while (0);
351
352 q->answer = dns_answer_unref(q->answer);
353 q->answer_rcode = 0;
354 q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
355 q->answer_errno = 0;
356 q->answer_authenticated = false0;
357 q->answer_protocol = _DNS_PROTOCOL_INVALID;
358 q->answer_family = AF_UNSPEC0;
359 q->answer_search_domain = dns_search_domain_unref(q->answer_search_domain);
360}
361
362DnsQuery *dns_query_free(DnsQuery *q) {
363 if (!q
4.1
'q' is non-null
7.1
'q' is non-null
10.1
'q' is non-null
13.1
'q' is non-null
4.1
'q' is non-null
7.1
'q' is non-null
10.1
'q' is non-null
13.1
'q' is non-null
)
1
Assuming 'q' is non-null
→
2
←
Taking false branch
→
5
←
Taking false branch
→
8
←
Taking false branch
→
11
←
Taking false branch
→
14
←
Taking false branch
→
364 return NULL((void*)0);
365
366 while (q->auxiliary_queries)
3
←
Loop condition is true. Entering loop body
→
6
←
Loop condition is true. Entering loop body
→
9
←
Loop condition is true. Entering loop body
→
12
←
Loop condition is true. Entering loop body
→
15
←
Loop condition is false. Execution continues on line 369
→
26
←
Loop condition is true. Entering loop body
→
367 dns_query_free(q->auxiliary_queries);
4
←
Calling 'dns_query_free'
→
7
←
Calling 'dns_query_free'
→
10
←
Calling 'dns_query_free'
→
13
←
Calling 'dns_query_free'
→
25
←
Returning; memory was released via 1st parameter
→
27
←
Use of memory after it is freed
368
369 if (q->auxiliary_for) {
16
←
Assuming field 'auxiliary_for' is null
→
17
←
Taking false branch
→
370 assert(q->auxiliary_for->n_auxiliary_queries > 0)do { if ((__builtin_expect(!!(!(q->auxiliary_for->n_auxiliary_queries
> 0)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("q->auxiliary_for->n_auxiliary_queries > 0"
), "../src/resolve/resolved-dns-query.c", 370, __PRETTY_FUNCTION__
); } while (0);
371 q->auxiliary_for->n_auxiliary_queries--;
372 LIST_REMOVE(auxiliary_queries, q->auxiliary_for->auxiliary_queries, q)do { typeof(*(q->auxiliary_for->auxiliary_queries)) **_head
= &(q->auxiliary_for->auxiliary_queries), *_item =
(q); do { if ((__builtin_expect(!!(!(_item)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-query.c"
, 372, __PRETTY_FUNCTION__); } while (0); if (_item->auxiliary_queries_next
) _item->auxiliary_queries_next->auxiliary_queries_prev
= _item->auxiliary_queries_prev; if (_item->auxiliary_queries_prev
) _item->auxiliary_queries_prev->auxiliary_queries_next
= _item->auxiliary_queries_next; else { do { if ((__builtin_expect
(!!(!(*_head == _item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD
, ("*_head == _item"), "../src/resolve/resolved-dns-query.c",
372, __PRETTY_FUNCTION__); } while (0); *_head = _item->auxiliary_queries_next
; } _item->auxiliary_queries_next = _item->auxiliary_queries_prev
= ((void*)0); } while (0);
373 }
374
375 dns_query_free_candidates(q);
376
377 dns_question_unref(q->question_idna);
378 dns_question_unref(q->question_utf8);
379
380 dns_query_reset_answer(q);
381
382 sd_bus_message_unref(q->request);
383 sd_bus_track_unref(q->bus_track);
384
385 dns_packet_unref(q->request_dns_packet);
386 dns_packet_unref(q->reply_dns_packet);
387
388 if (q->request_dns_stream) {
18
←
Assuming field 'request_dns_stream' is null
→
19
←
Taking false branch
→
389 /* Detach the stream from our query, in case something else keeps a reference to it. */
390 q->request_dns_stream->complete = NULL((void*)0);
391 q->request_dns_stream->on_packet = NULL((void*)0);
392 q->request_dns_stream->query = NULL((void*)0);
393 dns_stream_unref(q->request_dns_stream);
394 }
395
396 free(q->request_address_string);
397
398 if (q->manager) {
20
←
Assuming field 'manager' is null
→
21
←
Taking false branch
→
399 LIST_REMOVE(queries, q->manager->dns_queries, q)do { typeof(*(q->manager->dns_queries)) **_head = &
(q->manager->dns_queries), *_item = (q); do { if ((__builtin_expect
(!!(!(_item)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD,
("_item"), "../src/resolve/resolved-dns-query.c", 399, __PRETTY_FUNCTION__
); } while (0); if (_item->queries_next) _item->queries_next
->queries_prev = _item->queries_prev; if (_item->queries_prev
) _item->queries_prev->queries_next = _item->queries_next
; else { do { if ((__builtin_expect(!!(!(*_head == _item)),0)
)) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("*_head == _item"
), "../src/resolve/resolved-dns-query.c", 399, __PRETTY_FUNCTION__
); } while (0); *_head = _item->queries_next; } _item->
queries_next = _item->queries_prev = ((void*)0); } while (
0);
400 q->manager->n_dns_queries--;
401 }
402
403 return mfree(q);
22
←
Calling 'mfree'
→
24
←
Returning; memory was released via 1st parameter
→
404}
405
406int dns_query_new(
407 Manager *m,
408 DnsQuery **ret,
409 DnsQuestion *question_utf8,
410 DnsQuestion *question_idna,
411 int ifindex,
412 uint64_t flags) {
413
414 _cleanup_(dns_query_freep)__attribute__((cleanup(dns_query_freep))) DnsQuery *q = NULL((void*)0);
415 DnsResourceKey *key;
416 bool_Bool good = false0;
417 int r;
418 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)];
419
420 assert(m)do { if ((__builtin_expect(!!(!(m)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("m"), "../src/resolve/resolved-dns-query.c"
, 420, __PRETTY_FUNCTION__); } while (0);
421
422 if (dns_question_size(question_utf8) > 0) {
423 r = dns_question_is_valid_for_query(question_utf8);
424 if (r < 0)
425 return r;
426 if (r == 0)
427 return -EINVAL22;
428
429 good = true1;
430 }
431
432 /* If the IDNA and UTF8 questions are the same, merge their references */
433 r = dns_question_is_equal(question_idna, question_utf8);
434 if (r < 0)
435 return r;
436 if (r > 0)
437 question_idna = question_utf8;
438 else {
439 if (dns_question_size(question_idna) > 0) {
440 r = dns_question_is_valid_for_query(question_idna);
441 if (r < 0)
442 return r;
443 if (r == 0)
444 return -EINVAL22;
445
446 good = true1;
447 }
448 }
449
450 if (!good) /* don't allow empty queries */
451 return -EINVAL22;
452
453 if (m->n_dns_queries >= QUERIES_MAX2048)
454 return -EBUSY16;
455
456 q = new0(DnsQuery, 1)((DnsQuery*) calloc((1), sizeof(DnsQuery)));
457 if (!q)
458 return -ENOMEM12;
459
460 q->question_utf8 = dns_question_ref(question_utf8);
461 q->question_idna = dns_question_ref(question_idna);
462 q->ifindex = ifindex;
463 q->flags = flags;
464 q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
465 q->answer_protocol = _DNS_PROTOCOL_INVALID;
466 q->answer_family = AF_UNSPEC0;
467
468 /* First dump UTF8 question */
469 DNS_QUESTION_FOREACH(key, question_utf8)for (size_t __unique_prefix_i14 = ({ (key) = ((question_utf8)
&& (question_utf8)->n_keys > 0) ? (question_utf8
)->keys[0] : ((void*)0); 0; }); (question_utf8) &&
(__unique_prefix_i14 < (question_utf8)->n_keys); __unique_prefix_i14
++, (key) = (__unique_prefix_i14 < (question_utf8)->n_keys
? (question_utf8)->keys[__unique_prefix_i14] : ((void*)0)
))
470 log_debug("Looking up RR for %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-query.c", 471, __func__, "Looking up RR for %s."
, dns_resource_key_to_string(key, key_str, sizeof key_str)) :
-abs(_e); })
471 dns_resource_key_to_string(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-query.c", 471, __func__, "Looking up RR for %s."
, dns_resource_key_to_string(key, key_str, sizeof key_str)) :
-abs(_e); });
472
473 /* And then dump the IDNA question, but only what hasn't been dumped already through the UTF8 question. */
474 DNS_QUESTION_FOREACH(key, question_idna)for (size_t __unique_prefix_i15 = ({ (key) = ((question_idna)
&& (question_idna)->n_keys > 0) ? (question_idna
)->keys[0] : ((void*)0); 0; }); (question_idna) &&
(__unique_prefix_i15 < (question_idna)->n_keys); __unique_prefix_i15
++, (key) = (__unique_prefix_i15 < (question_idna)->n_keys
? (question_idna)->keys[__unique_prefix_i15] : ((void*)0)
)) {
475 r = dns_question_contains(question_utf8, key);
476 if (r < 0)
477 return r;
478 if (r > 0)
479 continue;
480
481 log_debug("Looking up IDNA RR for %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-query.c", 482, __func__, "Looking up IDNA RR for %s."
, dns_resource_key_to_string(key, key_str, sizeof key_str)) :
-abs(_e); })
482 dns_resource_key_to_string(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-query.c", 482, __func__, "Looking up IDNA RR for %s."
, dns_resource_key_to_string(key, key_str, sizeof key_str)) :
-abs(_e); });
483 }
484
485 LIST_PREPEND(queries, m->dns_queries, q)do { typeof(*(m->dns_queries)) **_head = &(m->dns_queries
), *_item = (q); do { if ((__builtin_expect(!!(!(_item)),0)))
log_assert_failed_realm(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-query.c"
, 485, __PRETTY_FUNCTION__); } while (0); if ((_item->queries_next
= *_head)) _item->queries_next->queries_prev = _item; _item
->queries_prev = ((void*)0); *_head = _item; } while (0);
486 m->n_dns_queries++;
487 q->manager = m;
488
489 if (ret)
490 *ret = q;
491 q = NULL((void*)0);
492
493 return 0;
494}
495
496int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) {
497 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 497, __PRETTY_FUNCTION__); } while (0);
498 assert(auxiliary_for)do { if ((__builtin_expect(!!(!(auxiliary_for)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("auxiliary_for"), "../src/resolve/resolved-dns-query.c"
, 498, __PRETTY_FUNCTION__); } while (0);
499
500 /* Ensure that the query is not auxiliary yet, and
501 * nothing else is auxiliary to it either */
502 assert(!q->auxiliary_for)do { if ((__builtin_expect(!!(!(!q->auxiliary_for)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("!q->auxiliary_for"), "../src/resolve/resolved-dns-query.c"
, 502, __PRETTY_FUNCTION__); } while (0);
503 assert(!q->auxiliary_queries)do { if ((__builtin_expect(!!(!(!q->auxiliary_queries)),0)
)) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!q->auxiliary_queries"
), "../src/resolve/resolved-dns-query.c", 503, __PRETTY_FUNCTION__
); } while (0);
504
505 /* Ensure that the unit we shall be made auxiliary for isn't
506 * auxiliary itself */
507 assert(!auxiliary_for->auxiliary_for)do { if ((__builtin_expect(!!(!(!auxiliary_for->auxiliary_for
)),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!auxiliary_for->auxiliary_for"
), "../src/resolve/resolved-dns-query.c", 507, __PRETTY_FUNCTION__
); } while (0);
508
509 if (auxiliary_for->n_auxiliary_queries >= AUXILIARY_QUERIES_MAX64)
510 return -EAGAIN11;
511
512 LIST_PREPEND(auxiliary_queries, auxiliary_for->auxiliary_queries, q)do { typeof(*(auxiliary_for->auxiliary_queries)) **_head =
&(auxiliary_for->auxiliary_queries), *_item = (q); do
{ if ((__builtin_expect(!!(!(_item)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("_item"), "../src/resolve/resolved-dns-query.c"
, 512, __PRETTY_FUNCTION__); } while (0); if ((_item->auxiliary_queries_next
= *_head)) _item->auxiliary_queries_next->auxiliary_queries_prev
= _item; _item->auxiliary_queries_prev = ((void*)0); *_head
= _item; } while (0);
513 q->auxiliary_for = auxiliary_for;
514
515 auxiliary_for->n_auxiliary_queries++;
516 return 0;
517}
518
519static void dns_query_complete(DnsQuery *q, DnsTransactionState state) {
520 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 520, __PRETTY_FUNCTION__); } while (0);
521 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-query.c"
, 521, __PRETTY_FUNCTION__); } while (0);
522 assert(DNS_TRANSACTION_IS_LIVE(q->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((q->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(q->state)"), "../src/resolve/resolved-dns-query.c"
, 522, __PRETTY_FUNCTION__); } while (0);
523
524 /* Note that this call might invalidate the query. Callers
525 * should hence not attempt to access the query or transaction
526 * after calling this function. */
527
528 q->state = state;
529
530 dns_query_stop(q);
531 if (q->complete)
532 q->complete(q);
533}
534
535static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) {
536 DnsQuery *q = userdata;
537
538 assert(s)do { if ((__builtin_expect(!!(!(s)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("s"), "../src/resolve/resolved-dns-query.c"
, 538, __PRETTY_FUNCTION__); } while (0);
539 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 539, __PRETTY_FUNCTION__); } while (0);
540
541 dns_query_complete(q, DNS_TRANSACTION_TIMEOUT);
542 return 0;
543}
544
545static int dns_query_add_candidate(DnsQuery *q, DnsScope *s) {
546 DnsQueryCandidate *c;
547 int r;
548
549 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 549, __PRETTY_FUNCTION__); } while (0);
550 assert(s)do { if ((__builtin_expect(!!(!(s)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("s"), "../src/resolve/resolved-dns-query.c"
, 550, __PRETTY_FUNCTION__); } while (0);
551
552 r = dns_query_candidate_new(&c, q, s);
553 if (r < 0)
554 return r;
555
556 /* If this a single-label domain on DNS, we might append a suitable search domain first. */
557 if ((q->flags & SD_RESOLVED_NO_SEARCH(1UL << 8)) == 0) {
558 r = dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question_idna));
559 if (r < 0)
560 goto fail;
561 if (r > 0) {
562 /* OK, we need a search domain now. Let's find one for this scope */
563
564 r = dns_query_candidate_next_search_domain(c);
565 if (r <= 0) /* if there's no search domain, then we won't add any transaction. */
566 goto fail;
567 }
568 }
569
570 r = dns_query_candidate_setup_transactions(c);
571 if (r < 0)
572 goto fail;
573
574 return 0;
575
576fail:
577 dns_query_candidate_free(c);
578 return r;
579}
580
581static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) {
582 _cleanup_(dns_answer_unrefp)__attribute__((cleanup(dns_answer_unrefp))) DnsAnswer *answer = NULL((void*)0);
583 int r;
584
585 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 585, __PRETTY_FUNCTION__); } while (0);
586 assert(state)do { if ((__builtin_expect(!!(!(state)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("state"), "../src/resolve/resolved-dns-query.c"
, 586, __PRETTY_FUNCTION__); } while (0);
587
588 /* Tries to synthesize localhost RR replies (and others) where appropriate. Note that this is done *after* the
589 * the normal lookup finished. The data from the network hence takes precedence over the data we
590 * synthesize. (But note that many scopes refuse to resolve certain domain names) */
591
592 if (!IN_SET(*state,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; })
593 DNS_TRANSACTION_RCODE_FAILURE,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; })
594 DNS_TRANSACTION_NO_SERVERS,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; })
595 DNS_TRANSACTION_TIMEOUT,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; })
596 DNS_TRANSACTION_ATTEMPTS_MAX_REACHED,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; })
597 DNS_TRANSACTION_NETWORK_DOWN,({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; })
598 DNS_TRANSACTION_NOT_FOUND)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_RCODE_FAILURE, DNS_TRANSACTION_NO_SERVERS
, DNS_TRANSACTION_TIMEOUT, DNS_TRANSACTION_ATTEMPTS_MAX_REACHED
, DNS_TRANSACTION_NETWORK_DOWN, DNS_TRANSACTION_NOT_FOUND})/sizeof
(int)]; switch(*state) { case DNS_TRANSACTION_RCODE_FAILURE: case
DNS_TRANSACTION_NO_SERVERS: case DNS_TRANSACTION_TIMEOUT: case
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: case DNS_TRANSACTION_NETWORK_DOWN
: case DNS_TRANSACTION_NOT_FOUND: _found = 1; break; default:
break; } _found; }))
599 return 0;
600
601 r = dns_synthesize_answer(
602 q->manager,
603 q->question_utf8,
604 q->ifindex,
605 &answer);
606 if (r == -ENXIO6) {
607 /* If we get ENXIO this tells us to generate NXDOMAIN unconditionally. */
608
609 dns_query_reset_answer(q);
610 q->answer_rcode = DNS_RCODE_NXDOMAIN;
611 q->answer_protocol = dns_synthesize_protocol(q->flags);
612 q->answer_family = dns_synthesize_family(q->flags);
613 q->answer_authenticated = true1;
614 *state = DNS_TRANSACTION_RCODE_FAILURE;
615
616 return 0;
617 }
618 if (r <= 0)
619 return r;
620
621 dns_query_reset_answer(q);
622
623 q->answer = TAKE_PTR(answer)({ typeof(answer) _ptr_ = (answer); (answer) = ((void*)0); _ptr_
; });
624 q->answer_rcode = DNS_RCODE_SUCCESS;
625 q->answer_protocol = dns_synthesize_protocol(q->flags);
626 q->answer_family = dns_synthesize_family(q->flags);
627 q->answer_authenticated = true1;
628
629 *state = DNS_TRANSACTION_SUCCESS;
630
631 return 1;
632}
633
634static int dns_query_try_etc_hosts(DnsQuery *q) {
635 _cleanup_(dns_answer_unrefp)__attribute__((cleanup(dns_answer_unrefp))) DnsAnswer *answer = NULL((void*)0);
636 int r;
637
638 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 638, __PRETTY_FUNCTION__); } while (0);
639
640 /* Looks in /etc/hosts for matching entries. Note that this is done *before* the normal lookup is done. The
641 * data from /etc/hosts hence takes precedence over the network. */
642
643 r = manager_etc_hosts_lookup(
644 q->manager,
645 q->question_utf8,
646 &answer);
647 if (r <= 0)
648 return r;
649
650 dns_query_reset_answer(q);
651
652 q->answer = TAKE_PTR(answer)({ typeof(answer) _ptr_ = (answer); (answer) = ((void*)0); _ptr_
; });
653 q->answer_rcode = DNS_RCODE_SUCCESS;
654 q->answer_protocol = dns_synthesize_protocol(q->flags);
655 q->answer_family = dns_synthesize_family(q->flags);
656 q->answer_authenticated = true1;
657
658 return 1;
659}
660
661int dns_query_go(DnsQuery *q) {
662 DnsScopeMatch found = DNS_SCOPE_NO;
663 DnsScope *s, *first = NULL((void*)0);
664 DnsQueryCandidate *c;
665 int r;
666
667 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 667, __PRETTY_FUNCTION__); } while (0);
668
669 if (q->state != DNS_TRANSACTION_NULL)
670 return 0;
671
672 r = dns_query_try_etc_hosts(q);
673 if (r < 0)
674 return r;
675 if (r > 0) {
676 dns_query_complete(q, DNS_TRANSACTION_SUCCESS);
677 return 1;
678 }
679
680 LIST_FOREACH(scopes, s, q->manager->dns_scopes)for ((s) = (q->manager->dns_scopes); (s); (s) = (s)->
scopes_next) {
681 DnsScopeMatch match;
682 const char *name;
683
684 name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol));
685 if (!name)
686 continue;
687
688 match = dns_scope_good_domain(s, q->ifindex, q->flags, name);
689 if (match < 0)
690 return match;
691
692 if (match == DNS_SCOPE_NO)
693 continue;
694
695 found = match;
696
697 if (match == DNS_SCOPE_YES) {
698 first = s;
699 break;
700 } else {
701 assert(match == DNS_SCOPE_MAYBE)do { if ((__builtin_expect(!!(!(match == DNS_SCOPE_MAYBE)),0)
)) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("match == DNS_SCOPE_MAYBE"
), "../src/resolve/resolved-dns-query.c", 701, __PRETTY_FUNCTION__
); } while (0);
702
703 if (!first)
704 first = s;
705 }
706 }
707
708 if (found == DNS_SCOPE_NO) {
709 DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
710
711 r = dns_query_synthesize_reply(q, &state);
712 if (r < 0)
713 return r;
714
715 dns_query_complete(q, state);
716 return 1;
717 }
718
719 r = dns_query_add_candidate(q, first);
720 if (r < 0)
721 goto fail;
722
723 LIST_FOREACH(scopes, s, first->scopes_next)for ((s) = (first->scopes_next); (s); (s) = (s)->scopes_next
) {
724 DnsScopeMatch match;
725 const char *name;
726
727 name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol));
728 if (!name)
729 continue;
730
731 match = dns_scope_good_domain(s, q->ifindex, q->flags, name);
732 if (match < 0)
733 goto fail;
734
735 if (match != found)
736 continue;
737
738 r = dns_query_add_candidate(q, s);
739 if (r < 0)
740 goto fail;
741 }
742
743 dns_query_reset_answer(q);
744
745 r = sd_event_add_time(
746 q->manager->event,
747 &q->timeout_event_source,
748 clock_boottime_or_monotonic(),
749 now(clock_boottime_or_monotonic()) + SD_RESOLVED_QUERY_TIMEOUT_USEC(120 * ((usec_t) 1000000ULL)),
750 0, on_query_timeout, q);
751 if (r < 0)
752 goto fail;
753
754 (void) sd_event_source_set_description(q->timeout_event_source, "query-timeout");
755
756 q->state = DNS_TRANSACTION_PENDING;
757 q->block_ready++;
758
759 /* Start the transactions */
760 LIST_FOREACH(candidates_by_query, c, q->candidates)for ((c) = (q->candidates); (c); (c) = (c)->candidates_by_query_next
) {
761 r = dns_query_candidate_go(c);
762 if (r < 0) {
763 q->block_ready--;
764 goto fail;
765 }
766 }
767
768 q->block_ready--;
769 dns_query_ready(q);
770
771 return 1;
772
773fail:
774 dns_query_stop(q);
775 return r;
776}
777
778static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
779 DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
780 bool_Bool has_authenticated = false0, has_non_authenticated = false0;
781 DnssecResult dnssec_result_authenticated = _DNSSEC_RESULT_INVALID, dnssec_result_non_authenticated = _DNSSEC_RESULT_INVALID;
782 DnsTransaction *t;
783 Iterator i;
784 int r;
785
786 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 786, __PRETTY_FUNCTION__); } while (0);
787
788 if (!c) {
789 r = dns_query_synthesize_reply(q, &state);
790 if (r < 0)
791 goto fail;
792
793 dns_query_complete(q, state);
794 return;
795 }
796
797 if (c->error_code != 0) {
798 /* If the candidate had an error condition of its own, start with that. */
799 state = DNS_TRANSACTION_ERRNO;
800 q->answer = dns_answer_unref(q->answer);
801 q->answer_rcode = 0;
802 q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
803 q->answer_authenticated = false0;
804 q->answer_errno = c->error_code;
805 }
806
807 SET_FOREACH(t, c->transactions, i)for ((i) = ((Iterator) { .idx = ((2147483647 *2U +1U) - 1), .
next_key = ((void*)0) }); set_iterate((c->transactions), &
(i), (void**)&(t)); ) {
808
809 switch (t->state) {
810
811 case DNS_TRANSACTION_SUCCESS: {
812 /* We found a successfully reply, merge it into the answer */
813 r = dns_answer_extend(&q->answer, t->answer);
814 if (r < 0)
815 goto fail;
816
817 q->answer_rcode = t->answer_rcode;
818 q->answer_errno = 0;
819
820 if (t->answer_authenticated) {
821 has_authenticated = true1;
822 dnssec_result_authenticated = t->answer_dnssec_result;
823 } else {
824 has_non_authenticated = true1;
825 dnssec_result_non_authenticated = t->answer_dnssec_result;
826 }
827
828 state = DNS_TRANSACTION_SUCCESS;
829 break;
830 }
831
832 case DNS_TRANSACTION_NULL:
833 case DNS_TRANSACTION_PENDING:
834 case DNS_TRANSACTION_VALIDATING:
835 case DNS_TRANSACTION_ABORTED:
836 /* Ignore transactions that didn't complete */
837 continue;
838
839 default:
840 /* Any kind of failure? Store the data away, if there's nothing stored yet. */
841 if (state == DNS_TRANSACTION_SUCCESS)
842 continue;
843
844 /* If there's already an authenticated negative reply stored, then prefer that over any unauthenticated one */
845 if (q->answer_authenticated && !t->answer_authenticated)
846 continue;
847
848 q->answer = dns_answer_unref(q->answer);
849 q->answer_rcode = t->answer_rcode;
850 q->answer_dnssec_result = t->answer_dnssec_result;
851 q->answer_authenticated = t->answer_authenticated;
852 q->answer_errno = t->answer_errno;
853
854 state = t->state;
855 break;
856 }
857 }
858
859 if (state == DNS_TRANSACTION_SUCCESS) {
860 q->answer_authenticated = has_authenticated && !has_non_authenticated;
861 q->answer_dnssec_result = q->answer_authenticated ? dnssec_result_authenticated : dnssec_result_non_authenticated;
862 }
863
864 q->answer_protocol = c->scope->protocol;
865 q->answer_family = c->scope->family;
866
867 dns_search_domain_unref(q->answer_search_domain);
868 q->answer_search_domain = dns_search_domain_ref(c->search_domain);
869
870 r = dns_query_synthesize_reply(q, &state);
871 if (r < 0)
872 goto fail;
873
874 dns_query_complete(q, state);
875 return;
876
877fail:
878 q->answer_errno = -r;
879 dns_query_complete(q, DNS_TRANSACTION_ERRNO);
880}
881
882void dns_query_ready(DnsQuery *q) {
883
884 DnsQueryCandidate *bad = NULL((void*)0), *c;
885 bool_Bool pending = false0;
886
887 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 887, __PRETTY_FUNCTION__); } while (0);
888 assert(DNS_TRANSACTION_IS_LIVE(q->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((q->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(q->state)"), "../src/resolve/resolved-dns-query.c"
, 888, __PRETTY_FUNCTION__); } while (0);
889
890 /* Note that this call might invalidate the query. Callers
891 * should hence not attempt to access the query or transaction
892 * after calling this function, unless the block_ready
893 * counter was explicitly bumped before doing so. */
894
895 if (q->block_ready > 0)
896 return;
897
898 LIST_FOREACH(candidates_by_query, c, q->candidates)for ((c) = (q->candidates); (c); (c) = (c)->candidates_by_query_next
) {
899 DnsTransactionState state;
900
901 state = dns_query_candidate_state(c);
902 switch (state) {
903
904 case DNS_TRANSACTION_SUCCESS:
905 /* One of the candidates is successful,
906 * let's use it, and copy its data out */
907 dns_query_accept(q, c);
908 return;
909
910 case DNS_TRANSACTION_NULL:
911 case DNS_TRANSACTION_PENDING:
912 case DNS_TRANSACTION_VALIDATING:
913 /* One of the candidates is still going on,
914 * let's maybe wait for it */
915 pending = true1;
916 break;
917
918 default:
919 /* Any kind of failure */
920 bad = c;
921 break;
922 }
923 }
924
925 if (pending)
926 return;
927
928 dns_query_accept(q, bad);
929}
930
931static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) {
932 _cleanup_(dns_question_unrefp)__attribute__((cleanup(dns_question_unrefp))) DnsQuestion *nq_idna = NULL((void*)0), *nq_utf8 = NULL((void*)0);
933 int r, k;
934
935 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 935, __PRETTY_FUNCTION__); } while (0);
936
937 q->n_cname_redirects++;
938 if (q->n_cname_redirects > CNAME_MAX8)
939 return -ELOOP40;
940
941 r = dns_question_cname_redirect(q->question_idna, cname, &nq_idna);
942 if (r < 0)
943 return r;
944 else if (r > 0)
945 log_debug("Following CNAME/DNAME %s → %s.", dns_question_first_name(q->question_idna), dns_question_first_name(nq_idna))({ 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-query.c", 945, __func__, "Following CNAME/DNAME %s → %s."
, dns_question_first_name(q->question_idna), dns_question_first_name
(nq_idna)) : -abs(_e); });
946
947 k = dns_question_is_equal(q->question_idna, q->question_utf8);
948 if (k < 0)
949 return r;
950 if (k > 0) {
951 /* Same question? Shortcut new question generation */
952 nq_utf8 = dns_question_ref(nq_idna);
953 k = r;
954 } else {
955 k = dns_question_cname_redirect(q->question_utf8, cname, &nq_utf8);
956 if (k < 0)
957 return k;
958 else if (k > 0)
959 log_debug("Following UTF8 CNAME/DNAME %s → %s.", dns_question_first_name(q->question_utf8), dns_question_first_name(nq_utf8))({ 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-query.c", 959, __func__, "Following UTF8 CNAME/DNAME %s → %s."
, dns_question_first_name(q->question_utf8), dns_question_first_name
(nq_utf8)) : -abs(_e); });
960 }
961
962 if (r == 0 && k == 0) /* No actual cname happened? */
963 return -ELOOP40;
964
965 if (q->answer_protocol == DNS_PROTOCOL_DNS) {
966 /* Don't permit CNAME redirects from unicast DNS to LLMNR or MulticastDNS, so that global resources
967 * cannot invade the local namespace. The opposite way we permit: local names may redirect to global
968 * ones. */
969
970 q->flags &= ~(SD_RESOLVED_LLMNR((1UL << 1)|(1UL << 2))|SD_RESOLVED_MDNS((1UL << 3)|(1UL << 4))); /* mask away the local protocols */
971 }
972
973 /* Turn off searching for the new name */
974 q->flags |= SD_RESOLVED_NO_SEARCH(1UL << 8);
975
976 dns_question_unref(q->question_idna);
977 q->question_idna = TAKE_PTR(nq_idna)({ typeof(nq_idna) _ptr_ = (nq_idna); (nq_idna) = ((void*)0);
_ptr_; });
978
979 dns_question_unref(q->question_utf8);
980 q->question_utf8 = TAKE_PTR(nq_utf8)({ typeof(nq_utf8) _ptr_ = (nq_utf8); (nq_utf8) = ((void*)0);
_ptr_; });
981
982 dns_query_free_candidates(q);
983 dns_query_reset_answer(q);
984
985 q->state = DNS_TRANSACTION_NULL;
986
987 return 0;
988}
989
990int dns_query_process_cname(DnsQuery *q) {
991 _cleanup_(dns_resource_record_unrefp)__attribute__((cleanup(dns_resource_record_unrefp))) DnsResourceRecord *cname = NULL((void*)0);
992 DnsQuestion *question;
993 DnsResourceRecord *rr;
994 int r;
995
996 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 996, __PRETTY_FUNCTION__); } while (0);
997
998 if (!IN_SET(q->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL)({ _Bool _found = 0; static __attribute__ ((unused)) char _static_assert__macros_need_to_be_extended
[20 - sizeof((int[]){DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL
})/sizeof(int)]; switch(q->state) { case DNS_TRANSACTION_SUCCESS
: case DNS_TRANSACTION_NULL: _found = 1; break; default: break
; } _found; }))
999 return DNS_QUERY_NOMATCH;
1000
1001 question = dns_query_question_for_protocol(q, q->answer_protocol);
1002
1003 DNS_ANSWER_FOREACH(rr, q->answer)for (size_t __unique_prefix_i16 = ({ (rr) = ((q->answer) &&
(q->answer)->n_rrs > 0) ? (q->answer)->items[
0].rr : ((void*)0); 0; }); (q->answer) && (__unique_prefix_i16
< (q->answer)->n_rrs); __unique_prefix_i16++, (rr) =
(__unique_prefix_i16 < (q->answer)->n_rrs ? (q->
answer)->items[__unique_prefix_i16].rr : ((void*)0))) {
1004 r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
1005 if (r < 0)
1006 return r;
1007 if (r > 0)
1008 return DNS_QUERY_MATCH; /* The answer matches directly, no need to follow cnames */
1009
1010 r = dns_question_matches_cname_or_dname(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
1011 if (r < 0)
1012 return r;
1013 if (r > 0 && !cname)
1014 cname = dns_resource_record_ref(rr);
1015 }
1016
1017 if (!cname)
1018 return DNS_QUERY_NOMATCH; /* No match and no cname to follow */
1019
1020 if (q->flags & SD_RESOLVED_NO_CNAME(1UL << 5))
1021 return -ELOOP40;
1022
1023 if (!q->answer_authenticated)
1024 q->previous_redirect_unauthenticated = true1;
1025
1026 /* OK, let's actually follow the CNAME */
1027 r = dns_query_cname_redirect(q, cname);
1028 if (r < 0)
1029 return r;
1030
1031 /* Let's see if the answer can already answer the new
1032 * redirected question */
1033 r = dns_query_process_cname(q);
1034 if (r != DNS_QUERY_NOMATCH)
1035 return r;
1036
1037 /* OK, it cannot, let's begin with the new query */
1038 r = dns_query_go(q);
1039 if (r < 0)
1040 return r;
1041
1042 return DNS_QUERY_RESTARTED; /* We restarted the query for a new cname */
1043}
1044
1045static int on_bus_track(sd_bus_track *t, void *userdata) {
1046 DnsQuery *q = userdata;
1047
1048 assert(t)do { if ((__builtin_expect(!!(!(t)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("t"), "../src/resolve/resolved-dns-query.c"
, 1048, __PRETTY_FUNCTION__); } while (0);
1049 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 1049, __PRETTY_FUNCTION__); } while (0);
1050
1051 log_debug("Client of active query vanished, aborting query.")({ 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-query.c", 1051, __func__, "Client of active query vanished, aborting query."
) : -abs(_e); });
1052 dns_query_complete(q, DNS_TRANSACTION_ABORTED);
1053 return 0;
1054}
1055
1056int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) {
1057 int r;
1058
1059 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 1059, __PRETTY_FUNCTION__); } while (0);
1060 assert(m)do { if ((__builtin_expect(!!(!(m)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("m"), "../src/resolve/resolved-dns-query.c"
, 1060, __PRETTY_FUNCTION__); } while (0);
1061
1062 if (!q->bus_track) {
1063 r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, on_bus_track, q);
1064 if (r < 0)
1065 return r;
1066 }
1067
1068 r = sd_bus_track_add_sender(q->bus_track, m);
1069 if (r < 0)
1070 return r;
1071
1072 return 0;
1073}
1074
1075DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol) {
1076 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 1076, __PRETTY_FUNCTION__); } while (0);
1077
1078 switch (protocol) {
1079
1080 case DNS_PROTOCOL_DNS:
1081 return q->question_idna;
1082
1083 case DNS_PROTOCOL_MDNS:
1084 case DNS_PROTOCOL_LLMNR:
1085 return q->question_utf8;
1086
1087 default:
1088 return NULL((void*)0);
1089 }
1090}
1091
1092const char *dns_query_string(DnsQuery *q) {
1093 const char *name;
1094 int r;
1095
1096 /* Returns a somewhat useful human-readable lookup key string for this query */
1097
1098 if (q->request_address_string)
1099 return q->request_address_string;
1100
1101 if (q->request_address_valid) {
1102 r = in_addr_to_string(q->request_family, &q->request_address, &q->request_address_string);
1103 if (r >= 0)
1104 return q->request_address_string;
1105 }
1106
1107 name = dns_question_first_name(q->question_utf8);
1108 if (name)
1109 return name;
1110
1111 return dns_question_first_name(q->question_idna);
1112}
1113
1114bool_Bool dns_query_fully_authenticated(DnsQuery *q) {
1115 assert(q)do { if ((__builtin_expect(!!(!(q)),0))) log_assert_failed_realm
(LOG_REALM_SYSTEMD, ("q"), "../src/resolve/resolved-dns-query.c"
, 1115, __PRETTY_FUNCTION__); } while (0);
1116
1117 return q->answer_authenticated && !q->previous_redirect_unauthenticated;
1118}
←

../src/basic/alloc-util.h

1/* SPDX-License-Identifier: LGPL-2.1+ */
2#pragma once
3
4#include <alloca.h>
5#include <stddef.h>
6#include <stdlib.h>
7#include <string.h>
8
9#include "macro.h"
10
11#define new(t, n)((t*) malloc_multiply(sizeof(t), (n))) ((t*) malloc_multiply(sizeof(t), (n)))
12
13#define new0(t, n)((t*) calloc((n), sizeof(t))) ((t*) calloc((n), sizeof(t)))
14
15#define newa(t, n)({ do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 15, __PRETTY_FUNCTION__); } while
(0); (t*) __builtin_alloca (sizeof(t)*(n)); }) \
16 ({ \
17 assert(!size_multiply_overflow(sizeof(t), n))do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 17, __PRETTY_FUNCTION__); } while
(0); \
18 (t*) alloca(sizeof(t)*(n))__builtin_alloca (sizeof(t)*(n)); \
19 })
20
21#define newa0(t, n)({ do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 21, __PRETTY_FUNCTION__); } while
(0); (t*) ({ char *_new_; size_t _len_ = sizeof(t)*(n); _new_
= __builtin_alloca (_len_); (void *) memset(_new_, 0, _len_)
; }); }) \
22 ({ \
23 assert(!size_multiply_overflow(sizeof(t), n))do { if ((__builtin_expect(!!(!(!size_multiply_overflow(sizeof
(t), n))),0))) log_assert_failed_realm(LOG_REALM_SYSTEMD, ("!size_multiply_overflow(sizeof(t), n)"
), "../src/basic/alloc-util.h", 23, __PRETTY_FUNCTION__); } while
(0); \
24 (t*) alloca0(sizeof(t)*(n))({ char *_new_; size_t _len_ = sizeof(t)*(n); _new_ = __builtin_alloca
(_len_); (void *) memset(_new_, 0, _len_); }); \
25 })
26
27#define newdup(t, p, n)((t*) memdup_multiply(p, sizeof(t), (n))) ((t*) memdup_multiply(p, sizeof(t), (n)))
28
29#define newdup_suffix0(t, p, n)((t*) memdup_suffix0_multiply(p, sizeof(t), (n))) ((t*) memdup_suffix0_multiply(p, sizeof(t), (n)))
30
31#define malloc0(n)(calloc(1, (n))) (calloc(1, (n)))
32
33static inline void *mfree(void *memory) {
34 free(memory);
23
←
Memory is released
→
35 return NULL((void*)0);
36}
37
38#define free_and_replace(a, b)({ free(a); (a) = (b); (b) = ((void*)0); 0; }) \
39 ({ \
40 free(a); \
41 (a) = (b); \
42 (b) = NULL((void*)0); \
43 0; \
44 })
45
46void* memdup(const void *p, size_t l) _alloc_(2);
47void* memdup_suffix0(const void *p, size_t l) _alloc_(2);
48
49static inline void freep(void *p) {
50 free(*(void**) p);
51}
52
53#define _cleanup_free___attribute__((cleanup(freep))) _cleanup_(freep)__attribute__((cleanup(freep)))
54
55static inline bool_Bool size_multiply_overflow(size_t size, size_t need) {
56 return _unlikely_(need != 0 && size > (SIZE_MAX / need))(__builtin_expect(!!(need != 0 && size > ((18446744073709551615UL
) / need)),0));
57}
58
59_malloc___attribute__ ((malloc)) _alloc_(1, 2) static inline void *malloc_multiply(size_t size, size_t need) {
60 if (size_multiply_overflow(size, need))
61 return NULL((void*)0);
62
63 return malloc(size * need);
64}
65
66#if !HAVE_REALLOCARRAY1
67_alloc_(2, 3) static inline void *reallocarray(void *p, size_t need, size_t size) {
68 if (size_multiply_overflow(size, need))
69 return NULL((void*)0);
70
71 return realloc(p, size * need);
72}
73#endif
74
75_alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t size, size_t need) {
76 if (size_multiply_overflow(size, need))
77 return NULL((void*)0);
78
79 return memdup(p, size * need);
80}
81
82_alloc_(2, 3) static inline void *memdup_suffix0_multiply(const void *p, size_t size, size_t need) {
83 if (size_multiply_overflow(size, need))
84 return NULL((void*)0);
85
86 return memdup_suffix0(p, size * need);
87}
88
89void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size);
90void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size);
91
92#define GREEDY_REALLOC(array, allocated, need)greedy_realloc((void**) &(array), &(allocated), (need
), sizeof((array)[0])) \
93 greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
94
95#define GREEDY_REALLOC0(array, allocated, need)greedy_realloc0((void**) &(array), &(allocated), (need
), sizeof((array)[0])) \
96 greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
97
98#define alloca0(n)({ char *_new_; size_t _len_ = n; _new_ = __builtin_alloca (_len_
); (void *) memset(_new_, 0, _len_); }) \
99 ({ \
100 char *_new_; \
101 size_t _len_ = n; \
102 _new_ = alloca(_len_)__builtin_alloca (_len_); \
103 (void *) memset(_new_, 0, _len_); \
104 })
105
106/* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
107#define alloca_align(size, align)({ void *_ptr_; size_t _mask_ = (align) - 1; _ptr_ = __builtin_alloca
((size) + _mask_); (void*)(((uintptr_t)_ptr_ + _mask_) &
~_mask_); }) \
108 ({ \
109 void *_ptr_; \
110 size_t _mask_ = (align) - 1; \
111 _ptr_ = alloca((size) + _mask_)__builtin_alloca ((size) + _mask_); \
112 (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_); \
113 })
114
115#define alloca0_align(size, align)({ void *_new_; size_t _size_ = (size); _new_ = ({ void *_ptr_
; size_t _mask_ = ((align)) - 1; _ptr_ = __builtin_alloca ((_size_
) + _mask_); (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_
); }); (void*)memset(_new_, 0, _size_); }) \
116 ({ \
117 void *_new_; \
118 size_t _size_ = (size); \
119 _new_ = alloca_align(_size_, (align))({ void *_ptr_; size_t _mask_ = ((align)) - 1; _ptr_ = __builtin_alloca
((_size_) + _mask_); (void*)(((uintptr_t)_ptr_ + _mask_) &
~_mask_); }); \
120 (void*)memset(_new_, 0, _size_); \
121 })
122
123/* Takes inspiration from Rusts's Option::take() method: reads and returns a pointer, but at the same time resets it to
124 * NULL. See: https://doc.rust-lang.org/std/option/enum.Option.html#method.take */
125#define TAKE_PTR(ptr)({ typeof(ptr) _ptr_ = (ptr); (ptr) = ((void*)0); _ptr_; }) \
126 ({ \
127 typeof(ptr) _ptr_ = (ptr); \
128 (ptr) = NULL((void*)0); \
129 _ptr_; \
130 })