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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e963e3ad | 2 | /*** |
edc6f2f5 | 3 | This file is part of systemd. |
e963e3ad DB |
4 | |
5 | Copyright 2005-2008 Lennart Poettering | |
6 | ||
edc6f2f5 TG |
7 | systemd is free software; you can redistribute it and/or modify it |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
e963e3ad | 11 | |
edc6f2f5 | 12 | systemd is distributed in the hope that it will be useful, but |
e963e3ad DB |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
edc6f2f5 TG |
17 | You should have received a copy of the GNU Lesser General Public License |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
e963e3ad | 20 | |
e963e3ad | 21 | #include <errno.h> |
07630cea LP |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
e963e3ad | 24 | #include <resolv.h> |
07630cea | 25 | #include <signal.h> |
e963e3ad | 26 | #include <stdint.h> |
07630cea LP |
27 | #include <stdio.h> |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
e963e3ad | 30 | #include <sys/prctl.h> |
07630cea LP |
31 | #include <unistd.h> |
32 | ||
33 | #include "sd-resolve.h" | |
e963e3ad | 34 | |
b5efdb8a | 35 | #include "alloc-util.h" |
3ffd4af2 | 36 | #include "fd-util.h" |
c004493c | 37 | #include "io-util.h" |
968d3d24 | 38 | #include "list.h" |
93f1bcf4 | 39 | #include "missing.h" |
07630cea LP |
40 | #include "socket-util.h" |
41 | #include "util.h" | |
e963e3ad | 42 | |
93f1bcf4 LP |
43 | #define WORKERS_MIN 1U |
44 | #define WORKERS_MAX 16U | |
45 | #define QUERIES_MAX 256U | |
46 | #define BUFSIZE 10240U | |
e963e3ad DB |
47 | |
48 | typedef enum { | |
49 | REQUEST_ADDRINFO, | |
50 | RESPONSE_ADDRINFO, | |
51 | REQUEST_NAMEINFO, | |
52 | RESPONSE_NAMEINFO, | |
e963e3ad DB |
53 | REQUEST_TERMINATE, |
54 | RESPONSE_DIED | |
5599e866 | 55 | } QueryType; |
e963e3ad DB |
56 | |
57 | enum { | |
968d3d24 LP |
58 | REQUEST_RECV_FD, |
59 | REQUEST_SEND_FD, | |
60 | RESPONSE_RECV_FD, | |
61 | RESPONSE_SEND_FD, | |
62 | _FD_MAX | |
e963e3ad DB |
63 | }; |
64 | ||
3bedba4a | 65 | struct sd_resolve { |
93f1bcf4 LP |
66 | unsigned n_ref; |
67 | ||
968d3d24 LP |
68 | bool dead:1; |
69 | pid_t original_pid; | |
e963e3ad | 70 | |
968d3d24 | 71 | int fds[_FD_MAX]; |
e963e3ad | 72 | |
968d3d24 LP |
73 | pthread_t workers[WORKERS_MAX]; |
74 | unsigned n_valid_workers; | |
e963e3ad | 75 | |
85529c81 | 76 | unsigned current_id; |
4a134c49 | 77 | sd_resolve_query* query_array[QUERIES_MAX]; |
96c76ac4 | 78 | unsigned n_queries, n_done, n_outstanding; |
93f1bcf4 LP |
79 | |
80 | sd_event_source *event_source; | |
81 | sd_event *event; | |
e963e3ad | 82 | |
93f1bcf4 LP |
83 | sd_resolve_query *current; |
84 | ||
85 | sd_resolve **default_resolve_ptr; | |
86 | pid_t tid; | |
4a134c49 LP |
87 | |
88 | LIST_HEAD(sd_resolve_query, queries); | |
e963e3ad DB |
89 | }; |
90 | ||
3bedba4a | 91 | struct sd_resolve_query { |
93f1bcf4 LP |
92 | unsigned n_ref; |
93 | ||
4f809256 | 94 | sd_resolve *resolve; |
93f1bcf4 LP |
95 | |
96 | QueryType type:4; | |
968d3d24 | 97 | bool done:1; |
4a134c49 | 98 | bool floating:1; |
e963e3ad | 99 | unsigned id; |
968d3d24 | 100 | |
e963e3ad DB |
101 | int ret; |
102 | int _errno; | |
103 | int _h_errno; | |
104 | struct addrinfo *addrinfo; | |
105 | char *serv, *host; | |
968d3d24 | 106 | |
93f1bcf4 LP |
107 | union { |
108 | sd_resolve_getaddrinfo_handler_t getaddrinfo_handler; | |
109 | sd_resolve_getnameinfo_handler_t getnameinfo_handler; | |
93f1bcf4 | 110 | }; |
968d3d24 | 111 | |
93f1bcf4 | 112 | void *userdata; |
4a134c49 LP |
113 | |
114 | LIST_FIELDS(sd_resolve_query, queries); | |
e963e3ad DB |
115 | }; |
116 | ||
5599e866 DB |
117 | typedef struct RHeader { |
118 | QueryType type; | |
e963e3ad DB |
119 | unsigned id; |
120 | size_t length; | |
5599e866 | 121 | } RHeader; |
e963e3ad | 122 | |
5599e866 DB |
123 | typedef struct AddrInfoRequest { |
124 | struct RHeader header; | |
968d3d24 | 125 | bool hints_valid; |
e963e3ad DB |
126 | int ai_flags; |
127 | int ai_family; | |
128 | int ai_socktype; | |
129 | int ai_protocol; | |
130 | size_t node_len, service_len; | |
5599e866 | 131 | } AddrInfoRequest; |
e963e3ad | 132 | |
5599e866 DB |
133 | typedef struct AddrInfoResponse { |
134 | struct RHeader header; | |
e963e3ad DB |
135 | int ret; |
136 | int _errno; | |
137 | int _h_errno; | |
138 | /* followed by addrinfo_serialization[] */ | |
5599e866 | 139 | } AddrInfoResponse; |
e963e3ad | 140 | |
5599e866 | 141 | typedef struct AddrInfoSerialization { |
e963e3ad DB |
142 | int ai_flags; |
143 | int ai_family; | |
144 | int ai_socktype; | |
145 | int ai_protocol; | |
146 | size_t ai_addrlen; | |
147 | size_t canonname_len; | |
148 | /* Followed by ai_addr amd ai_canonname with variable lengths */ | |
5599e866 | 149 | } AddrInfoSerialization; |
e963e3ad | 150 | |
5599e866 DB |
151 | typedef struct NameInfoRequest { |
152 | struct RHeader header; | |
e963e3ad DB |
153 | int flags; |
154 | socklen_t sockaddr_len; | |
968d3d24 | 155 | bool gethost:1, getserv:1; |
5599e866 | 156 | } NameInfoRequest; |
e963e3ad | 157 | |
5599e866 DB |
158 | typedef struct NameInfoResponse { |
159 | struct RHeader header; | |
e963e3ad DB |
160 | size_t hostlen, servlen; |
161 | int ret; | |
162 | int _errno; | |
163 | int _h_errno; | |
5599e866 | 164 | } NameInfoResponse; |
e963e3ad | 165 | |
5599e866 DB |
166 | typedef union Packet { |
167 | RHeader rheader; | |
168 | AddrInfoRequest addrinfo_request; | |
169 | AddrInfoResponse addrinfo_response; | |
170 | NameInfoRequest nameinfo_request; | |
171 | NameInfoResponse nameinfo_response; | |
5599e866 | 172 | } Packet; |
e963e3ad | 173 | |
93f1bcf4 LP |
174 | static int getaddrinfo_done(sd_resolve_query* q); |
175 | static int getnameinfo_done(sd_resolve_query *q); | |
93f1bcf4 | 176 | |
4a134c49 LP |
177 | static void resolve_query_disconnect(sd_resolve_query *q); |
178 | ||
93f1bcf4 | 179 | #define RESOLVE_DONT_DESTROY(resolve) \ |
4afd3348 | 180 | _cleanup_(sd_resolve_unrefp) _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) |
93f1bcf4 | 181 | |
e963e3ad | 182 | static int send_died(int out_fd) { |
968d3d24 | 183 | |
93f1bcf4 LP |
184 | RHeader rh = { |
185 | .type = RESPONSE_DIED, | |
186 | .length = sizeof(RHeader), | |
187 | }; | |
e963e3ad | 188 | |
93f1bcf4 | 189 | assert(out_fd >= 0); |
e963e3ad | 190 | |
968d3d24 LP |
191 | if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0) |
192 | return -errno; | |
193 | ||
194 | return 0; | |
e963e3ad DB |
195 | } |
196 | ||
197 | static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) { | |
5599e866 | 198 | AddrInfoSerialization s; |
e963e3ad | 199 | size_t cnl, l; |
968d3d24 | 200 | |
e963e3ad DB |
201 | assert(p); |
202 | assert(ai); | |
203 | assert(length); | |
204 | assert(*length <= maxlength); | |
205 | ||
968d3d24 | 206 | cnl = ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0; |
5599e866 | 207 | l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl; |
e963e3ad DB |
208 | |
209 | if (*length + l > maxlength) | |
210 | return NULL; | |
211 | ||
212 | s.ai_flags = ai->ai_flags; | |
213 | s.ai_family = ai->ai_family; | |
214 | s.ai_socktype = ai->ai_socktype; | |
215 | s.ai_protocol = ai->ai_protocol; | |
216 | s.ai_addrlen = ai->ai_addrlen; | |
217 | s.canonname_len = cnl; | |
218 | ||
5599e866 DB |
219 | memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization)); |
220 | memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen); | |
75f32f04 ZJS |
221 | memcpy_safe((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, |
222 | ai->ai_canonname, cnl); | |
e963e3ad DB |
223 | |
224 | *length += l; | |
225 | return (uint8_t*) p + l; | |
226 | } | |
227 | ||
968d3d24 LP |
228 | static int send_addrinfo_reply( |
229 | int out_fd, | |
230 | unsigned id, | |
231 | int ret, | |
232 | struct addrinfo *ai, | |
233 | int _errno, | |
234 | int _h_errno) { | |
235 | ||
93f1bcf4 LP |
236 | AddrInfoResponse resp = { |
237 | .header.type = RESPONSE_ADDRINFO, | |
238 | .header.id = id, | |
239 | .header.length = sizeof(AddrInfoResponse), | |
240 | .ret = ret, | |
241 | ._errno = _errno, | |
242 | ._h_errno = _h_errno, | |
243 | }; | |
244 | ||
968d3d24 LP |
245 | struct msghdr mh = {}; |
246 | struct iovec iov[2]; | |
247 | union { | |
248 | AddrInfoSerialization ais; | |
249 | uint8_t space[BUFSIZE]; | |
250 | } buffer; | |
251 | ||
e963e3ad DB |
252 | assert(out_fd >= 0); |
253 | ||
e963e3ad | 254 | if (ret == 0 && ai) { |
968d3d24 | 255 | void *p = &buffer; |
e963e3ad DB |
256 | struct addrinfo *k; |
257 | ||
258 | for (k = ai; k; k = k->ai_next) { | |
968d3d24 | 259 | p = serialize_addrinfo(p, k, &resp.header.length, (uint8_t*) &buffer + BUFSIZE - (uint8_t*) p); |
8e50b5a7 | 260 | if (!p) { |
968d3d24 LP |
261 | freeaddrinfo(ai); |
262 | return -ENOBUFS; | |
e963e3ad DB |
263 | } |
264 | } | |
265 | } | |
266 | ||
267 | if (ai) | |
268 | freeaddrinfo(ai); | |
269 | ||
968d3d24 LP |
270 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(AddrInfoResponse) }; |
271 | iov[1] = (struct iovec) { .iov_base = &buffer, .iov_len = resp.header.length - sizeof(AddrInfoResponse) }; | |
272 | ||
273 | mh.msg_iov = iov; | |
274 | mh.msg_iovlen = ELEMENTSOF(iov); | |
275 | ||
276 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) | |
277 | return -errno; | |
278 | ||
279 | return 0; | |
e963e3ad DB |
280 | } |
281 | ||
968d3d24 LP |
282 | static int send_nameinfo_reply( |
283 | int out_fd, | |
284 | unsigned id, | |
285 | int ret, | |
286 | const char *host, | |
287 | const char *serv, | |
288 | int _errno, | |
289 | int _h_errno) { | |
290 | ||
93f1bcf4 LP |
291 | NameInfoResponse resp = { |
292 | .header.type = RESPONSE_NAMEINFO, | |
293 | .header.id = id, | |
294 | .ret = ret, | |
295 | ._errno = _errno, | |
296 | ._h_errno = _h_errno, | |
297 | }; | |
298 | ||
968d3d24 LP |
299 | struct msghdr mh = {}; |
300 | struct iovec iov[3]; | |
e963e3ad | 301 | size_t hl, sl; |
e963e3ad DB |
302 | |
303 | assert(out_fd >= 0); | |
304 | ||
305 | sl = serv ? strlen(serv)+1 : 0; | |
306 | hl = host ? strlen(host)+1 : 0; | |
307 | ||
968d3d24 | 308 | resp.header.length = sizeof(NameInfoResponse) + hl + sl; |
968d3d24 LP |
309 | resp.hostlen = hl; |
310 | resp.servlen = sl; | |
e963e3ad | 311 | |
968d3d24 LP |
312 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(NameInfoResponse) }; |
313 | iov[1] = (struct iovec) { .iov_base = (void*) host, .iov_len = hl }; | |
314 | iov[2] = (struct iovec) { .iov_base = (void*) serv, .iov_len = sl }; | |
e963e3ad | 315 | |
968d3d24 LP |
316 | mh.msg_iov = iov; |
317 | mh.msg_iovlen = ELEMENTSOF(iov); | |
e963e3ad | 318 | |
968d3d24 LP |
319 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) |
320 | return -errno; | |
e963e3ad | 321 | |
968d3d24 | 322 | return 0; |
e963e3ad DB |
323 | } |
324 | ||
5599e866 DB |
325 | static int handle_request(int out_fd, const Packet *packet, size_t length) { |
326 | const RHeader *req; | |
968d3d24 | 327 | |
e963e3ad | 328 | assert(out_fd >= 0); |
968d3d24 | 329 | assert(packet); |
e963e3ad DB |
330 | |
331 | req = &packet->rheader; | |
968d3d24 | 332 | |
5599e866 | 333 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
334 | assert(length == req->length); |
335 | ||
336 | switch (req->type) { | |
968d3d24 | 337 | |
e963e3ad | 338 | case REQUEST_ADDRINFO: { |
5599e866 | 339 | const AddrInfoRequest *ai_req = &packet->addrinfo_request; |
968d3d24 | 340 | struct addrinfo hints = {}, *result = NULL; |
e963e3ad DB |
341 | const char *node, *service; |
342 | int ret; | |
343 | ||
5599e866 DB |
344 | assert(length >= sizeof(AddrInfoRequest)); |
345 | assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len); | |
e963e3ad | 346 | |
968d3d24 LP |
347 | hints.ai_flags = ai_req->ai_flags; |
348 | hints.ai_family = ai_req->ai_family; | |
349 | hints.ai_socktype = ai_req->ai_socktype; | |
350 | hints.ai_protocol = ai_req->ai_protocol; | |
e963e3ad | 351 | |
5599e866 DB |
352 | node = ai_req->node_len ? (const char*) ai_req + sizeof(AddrInfoRequest) : NULL; |
353 | service = ai_req->service_len ? (const char*) ai_req + sizeof(AddrInfoRequest) + ai_req->node_len : NULL; | |
e963e3ad | 354 | |
968d3d24 LP |
355 | ret = getaddrinfo( |
356 | node, service, | |
357 | ai_req->hints_valid ? &hints : NULL, | |
e963e3ad DB |
358 | &result); |
359 | ||
360 | /* send_addrinfo_reply() frees result */ | |
361 | return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno); | |
362 | } | |
363 | ||
364 | case REQUEST_NAMEINFO: { | |
5599e866 | 365 | const NameInfoRequest *ni_req = &packet->nameinfo_request; |
e963e3ad | 366 | char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; |
968d3d24 LP |
367 | union sockaddr_union sa; |
368 | int ret; | |
e963e3ad | 369 | |
5599e866 DB |
370 | assert(length >= sizeof(NameInfoRequest)); |
371 | assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len); | |
968d3d24 | 372 | assert(sizeof(sa) >= ni_req->sockaddr_len); |
e963e3ad | 373 | |
5599e866 | 374 | memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len); |
e963e3ad | 375 | |
968d3d24 | 376 | ret = getnameinfo(&sa.sa, ni_req->sockaddr_len, |
e963e3ad DB |
377 | ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0, |
378 | ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0, | |
379 | ni_req->flags); | |
380 | ||
381 | return send_nameinfo_reply(out_fd, req->id, ret, | |
382 | ret == 0 && ni_req->gethost ? hostbuf : NULL, | |
383 | ret == 0 && ni_req->getserv ? servbuf : NULL, | |
384 | errno, h_errno); | |
385 | } | |
386 | ||
e963e3ad DB |
387 | case REQUEST_TERMINATE: |
388 | /* Quit */ | |
968d3d24 | 389 | return -ECONNRESET; |
e963e3ad DB |
390 | |
391 | default: | |
968d3d24 | 392 | assert_not_reached("Unknown request"); |
e963e3ad DB |
393 | } |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | static void* thread_worker(void *p) { | |
4f809256 | 399 | sd_resolve *resolve = p; |
e963e3ad DB |
400 | sigset_t fullset; |
401 | ||
402 | /* No signals in this thread please */ | |
968d3d24 LP |
403 | assert_se(sigfillset(&fullset) == 0); |
404 | assert_se(pthread_sigmask(SIG_BLOCK, &fullset, NULL) == 0); | |
405 | ||
406 | /* Assign a pretty name to this thread */ | |
79d62972 | 407 | (void) prctl(PR_SET_NAME, (unsigned long) "sd-resolve"); |
e963e3ad | 408 | |
3bedba4a | 409 | while (!resolve->dead) { |
968d3d24 LP |
410 | union { |
411 | Packet packet; | |
412 | uint8_t space[BUFSIZE]; | |
413 | } buf; | |
e963e3ad DB |
414 | ssize_t length; |
415 | ||
968d3d24 LP |
416 | length = recv(resolve->fds[REQUEST_RECV_FD], &buf, sizeof(buf), 0); |
417 | if (length < 0) { | |
418 | if (errno == EINTR) | |
e963e3ad | 419 | continue; |
968d3d24 | 420 | |
e963e3ad DB |
421 | break; |
422 | } | |
968d3d24 LP |
423 | if (length == 0) |
424 | break; | |
e963e3ad | 425 | |
3bedba4a | 426 | if (resolve->dead) |
e963e3ad DB |
427 | break; |
428 | ||
968d3d24 | 429 | if (handle_request(resolve->fds[RESPONSE_SEND_FD], &buf.packet, (size_t) length) < 0) |
e963e3ad DB |
430 | break; |
431 | } | |
432 | ||
3bedba4a | 433 | send_died(resolve->fds[RESPONSE_SEND_FD]); |
e963e3ad DB |
434 | |
435 | return NULL; | |
436 | } | |
437 | ||
968d3d24 LP |
438 | static int start_threads(sd_resolve *resolve, unsigned extra) { |
439 | unsigned n; | |
440 | int r; | |
e963e3ad | 441 | |
96c76ac4 | 442 | n = resolve->n_outstanding + extra; |
93f1bcf4 | 443 | n = CLAMP(n, WORKERS_MIN, WORKERS_MAX); |
e963e3ad | 444 | |
968d3d24 LP |
445 | while (resolve->n_valid_workers < n) { |
446 | ||
447 | r = pthread_create(&resolve->workers[resolve->n_valid_workers], NULL, thread_worker, resolve); | |
448 | if (r != 0) | |
449 | return -r; | |
450 | ||
313cefa1 | 451 | resolve->n_valid_workers++; |
e963e3ad DB |
452 | } |
453 | ||
968d3d24 LP |
454 | return 0; |
455 | } | |
456 | ||
457 | static bool resolve_pid_changed(sd_resolve *r) { | |
458 | assert(r); | |
459 | ||
460 | /* We don't support people creating a resolver and keeping it | |
461 | * around after fork(). Let's complain. */ | |
462 | ||
df0ff127 | 463 | return r->original_pid != getpid_cached(); |
968d3d24 | 464 | } |
e963e3ad | 465 | |
968d3d24 LP |
466 | _public_ int sd_resolve_new(sd_resolve **ret) { |
467 | sd_resolve *resolve = NULL; | |
468 | int i, r; | |
469 | ||
470 | assert_return(ret, -EINVAL); | |
471 | ||
472 | resolve = new0(sd_resolve, 1); | |
473 | if (!resolve) | |
474 | return -ENOMEM; | |
475 | ||
93f1bcf4 | 476 | resolve->n_ref = 1; |
df0ff127 | 477 | resolve->original_pid = getpid_cached(); |
93f1bcf4 | 478 | |
968d3d24 | 479 | for (i = 0; i < _FD_MAX; i++) |
3bedba4a | 480 | resolve->fds[i] = -1; |
e963e3ad | 481 | |
968d3d24 LP |
482 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + REQUEST_RECV_FD); |
483 | if (r < 0) { | |
484 | r = -errno; | |
8a6233fb | 485 | goto fail; |
968d3d24 | 486 | } |
e963e3ad | 487 | |
968d3d24 LP |
488 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + RESPONSE_RECV_FD); |
489 | if (r < 0) { | |
490 | r = -errno; | |
8a6233fb | 491 | goto fail; |
e963e3ad DB |
492 | } |
493 | ||
968d3d24 LP |
494 | fd_inc_sndbuf(resolve->fds[REQUEST_SEND_FD], QUERIES_MAX * BUFSIZE); |
495 | fd_inc_rcvbuf(resolve->fds[REQUEST_RECV_FD], QUERIES_MAX * BUFSIZE); | |
496 | fd_inc_sndbuf(resolve->fds[RESPONSE_SEND_FD], QUERIES_MAX * BUFSIZE); | |
497 | fd_inc_rcvbuf(resolve->fds[RESPONSE_RECV_FD], QUERIES_MAX * BUFSIZE); | |
e963e3ad | 498 | |
3bedba4a | 499 | fd_nonblock(resolve->fds[RESPONSE_RECV_FD], true); |
e963e3ad | 500 | |
968d3d24 LP |
501 | *ret = resolve; |
502 | return 0; | |
e963e3ad DB |
503 | |
504 | fail: | |
93f1bcf4 | 505 | sd_resolve_unref(resolve); |
968d3d24 | 506 | return r; |
e963e3ad DB |
507 | } |
508 | ||
93f1bcf4 LP |
509 | _public_ int sd_resolve_default(sd_resolve **ret) { |
510 | ||
511 | static thread_local sd_resolve *default_resolve = NULL; | |
512 | sd_resolve *e = NULL; | |
513 | int r; | |
514 | ||
515 | if (!ret) | |
516 | return !!default_resolve; | |
517 | ||
518 | if (default_resolve) { | |
519 | *ret = sd_resolve_ref(default_resolve); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | r = sd_resolve_new(&e); | |
524 | if (r < 0) | |
525 | return r; | |
526 | ||
527 | e->default_resolve_ptr = &default_resolve; | |
528 | e->tid = gettid(); | |
529 | default_resolve = e; | |
530 | ||
531 | *ret = e; | |
532 | return 1; | |
533 | } | |
534 | ||
535 | _public_ int sd_resolve_get_tid(sd_resolve *resolve, pid_t *tid) { | |
536 | assert_return(resolve, -EINVAL); | |
537 | assert_return(tid, -EINVAL); | |
538 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
539 | ||
540 | if (resolve->tid != 0) { | |
541 | *tid = resolve->tid; | |
542 | return 0; | |
543 | } | |
544 | ||
545 | if (resolve->event) | |
546 | return sd_event_get_tid(resolve->event, tid); | |
547 | ||
548 | return -ENXIO; | |
549 | } | |
e963e3ad | 550 | |
93f1bcf4 LP |
551 | static void resolve_free(sd_resolve *resolve) { |
552 | PROTECT_ERRNO; | |
4a134c49 | 553 | sd_resolve_query *q; |
968d3d24 | 554 | unsigned i; |
e963e3ad | 555 | |
93f1bcf4 LP |
556 | assert(resolve); |
557 | ||
4a134c49 LP |
558 | while ((q = resolve->queries)) { |
559 | assert(q->floating); | |
560 | resolve_query_disconnect(q); | |
561 | sd_resolve_query_unref(q); | |
562 | } | |
563 | ||
93f1bcf4 LP |
564 | if (resolve->default_resolve_ptr) |
565 | *(resolve->default_resolve_ptr) = NULL; | |
968d3d24 LP |
566 | |
567 | resolve->dead = true; | |
e963e3ad | 568 | |
93f1bcf4 LP |
569 | sd_resolve_detach_event(resolve); |
570 | ||
3bedba4a | 571 | if (resolve->fds[REQUEST_SEND_FD] >= 0) { |
e963e3ad | 572 | |
968d3d24 LP |
573 | RHeader req = { |
574 | .type = REQUEST_TERMINATE, | |
575 | .length = sizeof(req) | |
576 | }; | |
e963e3ad DB |
577 | |
578 | /* Send one termination packet for each worker */ | |
968d3d24 | 579 | for (i = 0; i < resolve->n_valid_workers; i++) |
e62d9b81 | 580 | (void) send(resolve->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); |
e963e3ad DB |
581 | } |
582 | ||
9d4e7d13 ZJS |
583 | /* Now terminate them and wait until they are gone. |
584 | If we get an error than most likely the thread already exited. */ | |
5263a45b | 585 | for (i = 0; i < resolve->n_valid_workers; i++) |
9d4e7d13 | 586 | (void) pthread_join(resolve->workers[i], NULL); |
e963e3ad DB |
587 | |
588 | /* Close all communication channels */ | |
3a1707ff | 589 | close_many(resolve->fds, _FD_MAX); |
3bedba4a | 590 | free(resolve); |
93f1bcf4 LP |
591 | } |
592 | ||
593 | _public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { | |
594 | assert_return(resolve, NULL); | |
595 | ||
596 | assert(resolve->n_ref >= 1); | |
597 | resolve->n_ref++; | |
598 | ||
599 | return resolve; | |
600 | } | |
601 | ||
602 | _public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { | |
603 | ||
604 | if (!resolve) | |
605 | return NULL; | |
606 | ||
607 | assert(resolve->n_ref >= 1); | |
608 | resolve->n_ref--; | |
609 | ||
610 | if (resolve->n_ref <= 0) | |
611 | resolve_free(resolve); | |
612 | ||
968d3d24 | 613 | return NULL; |
e963e3ad DB |
614 | } |
615 | ||
968d3d24 LP |
616 | _public_ int sd_resolve_get_fd(sd_resolve *resolve) { |
617 | assert_return(resolve, -EINVAL); | |
618 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 619 | |
3bedba4a | 620 | return resolve->fds[RESPONSE_RECV_FD]; |
e963e3ad DB |
621 | } |
622 | ||
968d3d24 LP |
623 | _public_ int sd_resolve_get_events(sd_resolve *resolve) { |
624 | assert_return(resolve, -EINVAL); | |
625 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
626 | ||
627 | return resolve->n_queries > resolve->n_done ? POLLIN : 0; | |
628 | } | |
629 | ||
630 | _public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { | |
631 | assert_return(resolve, -EINVAL); | |
632 | assert_return(usec, -EINVAL); | |
633 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
634 | ||
635 | *usec = (uint64_t) -1; | |
636 | return 0; | |
637 | } | |
638 | ||
4f809256 DB |
639 | static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { |
640 | sd_resolve_query *q; | |
968d3d24 | 641 | |
3bedba4a | 642 | assert(resolve); |
e963e3ad | 643 | |
4a134c49 | 644 | q = resolve->query_array[id % QUERIES_MAX]; |
8e50b5a7 | 645 | if (q) |
e963e3ad DB |
646 | if (q->id == id) |
647 | return q; | |
648 | ||
649 | return NULL; | |
650 | } | |
651 | ||
93f1bcf4 LP |
652 | static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { |
653 | int r; | |
654 | ||
e963e3ad DB |
655 | assert(q); |
656 | assert(!q->done); | |
93f1bcf4 | 657 | assert(q->resolve == resolve); |
e963e3ad | 658 | |
968d3d24 | 659 | q->done = true; |
313cefa1 | 660 | resolve->n_done++; |
93f1bcf4 | 661 | |
73dec319 | 662 | resolve->current = sd_resolve_query_ref(q); |
93f1bcf4 LP |
663 | |
664 | switch (q->type) { | |
665 | ||
666 | case REQUEST_ADDRINFO: | |
667 | r = getaddrinfo_done(q); | |
668 | break; | |
669 | ||
670 | case REQUEST_NAMEINFO: | |
671 | r = getnameinfo_done(q); | |
672 | break; | |
673 | ||
93f1bcf4 LP |
674 | default: |
675 | assert_not_reached("Cannot complete unknown query type"); | |
676 | } | |
677 | ||
502fe44e | 678 | resolve->current = NULL; |
93f1bcf4 | 679 | |
4a134c49 LP |
680 | if (q->floating) { |
681 | resolve_query_disconnect(q); | |
f2e2415d | 682 | sd_resolve_query_unref(q); |
4a134c49 LP |
683 | } |
684 | ||
502fe44e LP |
685 | sd_resolve_query_unref(q); |
686 | ||
93f1bcf4 | 687 | return r; |
e963e3ad DB |
688 | } |
689 | ||
968d3d24 | 690 | static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { |
5599e866 | 691 | AddrInfoSerialization s; |
e963e3ad DB |
692 | size_t l; |
693 | struct addrinfo *ai; | |
968d3d24 | 694 | |
e963e3ad | 695 | assert(p); |
968d3d24 | 696 | assert(*p); |
e963e3ad DB |
697 | assert(ret_ai); |
698 | assert(length); | |
699 | ||
5599e866 | 700 | if (*length < sizeof(AddrInfoSerialization)) |
968d3d24 | 701 | return -EBADMSG; |
e963e3ad | 702 | |
968d3d24 | 703 | memcpy(&s, *p, sizeof(s)); |
e963e3ad | 704 | |
5599e866 | 705 | l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; |
e963e3ad | 706 | if (*length < l) |
968d3d24 | 707 | return -EBADMSG; |
e963e3ad | 708 | |
968d3d24 | 709 | ai = new0(struct addrinfo, 1); |
8e50b5a7 | 710 | if (!ai) |
968d3d24 | 711 | return -ENOMEM; |
e963e3ad DB |
712 | |
713 | ai->ai_flags = s.ai_flags; | |
714 | ai->ai_family = s.ai_family; | |
715 | ai->ai_socktype = s.ai_socktype; | |
716 | ai->ai_protocol = s.ai_protocol; | |
717 | ai->ai_addrlen = s.ai_addrlen; | |
718 | ||
968d3d24 LP |
719 | if (s.ai_addrlen > 0) { |
720 | ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); | |
721 | if (!ai->ai_addr) { | |
722 | free(ai); | |
723 | return -ENOMEM; | |
724 | } | |
725 | } | |
e963e3ad | 726 | |
968d3d24 LP |
727 | if (s.canonname_len > 0) { |
728 | ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); | |
729 | if (!ai->ai_canonname) { | |
730 | free(ai->ai_addr); | |
731 | free(ai); | |
732 | return -ENOMEM; | |
733 | } | |
734 | } | |
e963e3ad DB |
735 | |
736 | *length -= l; | |
737 | *ret_ai = ai; | |
968d3d24 | 738 | *p = ((const uint8_t*) *p) + l; |
e963e3ad | 739 | |
968d3d24 | 740 | return 0; |
e963e3ad DB |
741 | } |
742 | ||
5599e866 DB |
743 | static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { |
744 | const RHeader *resp; | |
4f809256 | 745 | sd_resolve_query *q; |
968d3d24 | 746 | int r; |
e963e3ad | 747 | |
3bedba4a | 748 | assert(resolve); |
e963e3ad DB |
749 | |
750 | resp = &packet->rheader; | |
751 | assert(resp); | |
5599e866 | 752 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
753 | assert(length == resp->length); |
754 | ||
755 | if (resp->type == RESPONSE_DIED) { | |
968d3d24 | 756 | resolve->dead = true; |
e963e3ad DB |
757 | return 0; |
758 | } | |
759 | ||
96c76ac4 LP |
760 | assert(resolve->n_outstanding > 0); |
761 | resolve->n_outstanding--; | |
762 | ||
3bedba4a | 763 | q = lookup_query(resolve, resp->id); |
8e50b5a7 | 764 | if (!q) |
e963e3ad DB |
765 | return 0; |
766 | ||
767 | switch (resp->type) { | |
968d3d24 | 768 | |
e963e3ad | 769 | case RESPONSE_ADDRINFO: { |
5599e866 | 770 | const AddrInfoResponse *ai_resp = &packet->addrinfo_response; |
e963e3ad DB |
771 | const void *p; |
772 | size_t l; | |
773 | struct addrinfo *prev = NULL; | |
774 | ||
5599e866 | 775 | assert(length >= sizeof(AddrInfoResponse)); |
e963e3ad DB |
776 | assert(q->type == REQUEST_ADDRINFO); |
777 | ||
778 | q->ret = ai_resp->ret; | |
779 | q->_errno = ai_resp->_errno; | |
780 | q->_h_errno = ai_resp->_h_errno; | |
968d3d24 | 781 | |
5599e866 DB |
782 | l = length - sizeof(AddrInfoResponse); |
783 | p = (const uint8_t*) resp + sizeof(AddrInfoResponse); | |
e963e3ad DB |
784 | |
785 | while (l > 0 && p) { | |
786 | struct addrinfo *ai = NULL; | |
e963e3ad | 787 | |
968d3d24 LP |
788 | r = unserialize_addrinfo(&p, &l, &ai); |
789 | if (r < 0) { | |
790 | q->ret = EAI_SYSTEM; | |
791 | q->_errno = -r; | |
792 | q->_h_errno = 0; | |
793 | freeaddrinfo(q->addrinfo); | |
794 | q->addrinfo = NULL; | |
e963e3ad DB |
795 | break; |
796 | } | |
797 | ||
798 | if (prev) | |
799 | prev->ai_next = ai; | |
800 | else | |
801 | q->addrinfo = ai; | |
802 | ||
803 | prev = ai; | |
804 | } | |
805 | ||
93f1bcf4 | 806 | return complete_query(resolve, q); |
e963e3ad DB |
807 | } |
808 | ||
809 | case RESPONSE_NAMEINFO: { | |
5599e866 | 810 | const NameInfoResponse *ni_resp = &packet->nameinfo_response; |
e963e3ad | 811 | |
5599e866 | 812 | assert(length >= sizeof(NameInfoResponse)); |
e963e3ad DB |
813 | assert(q->type == REQUEST_NAMEINFO); |
814 | ||
815 | q->ret = ni_resp->ret; | |
816 | q->_errno = ni_resp->_errno; | |
817 | q->_h_errno = ni_resp->_h_errno; | |
818 | ||
968d3d24 LP |
819 | if (ni_resp->hostlen > 0) { |
820 | q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); | |
821 | if (!q->host) { | |
e963e3ad | 822 | q->ret = EAI_MEMORY; |
968d3d24 LP |
823 | q->_errno = ENOMEM; |
824 | q->_h_errno = 0; | |
825 | } | |
826 | } | |
e963e3ad | 827 | |
968d3d24 LP |
828 | if (ni_resp->servlen > 0) { |
829 | q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); | |
830 | if (!q->serv) { | |
e963e3ad | 831 | q->ret = EAI_MEMORY; |
968d3d24 LP |
832 | q->_errno = ENOMEM; |
833 | q->_h_errno = 0; | |
834 | } | |
835 | } | |
e963e3ad | 836 | |
93f1bcf4 | 837 | return complete_query(resolve, q); |
e963e3ad DB |
838 | } |
839 | ||
e963e3ad | 840 | default: |
93f1bcf4 | 841 | return 0; |
e963e3ad | 842 | } |
e963e3ad DB |
843 | } |
844 | ||
968d3d24 | 845 | _public_ int sd_resolve_process(sd_resolve *resolve) { |
93f1bcf4 LP |
846 | RESOLVE_DONT_DESTROY(resolve); |
847 | ||
848 | union { | |
849 | Packet packet; | |
850 | uint8_t space[BUFSIZE]; | |
851 | } buf; | |
852 | ssize_t l; | |
853 | int r; | |
968d3d24 LP |
854 | |
855 | assert_return(resolve, -EINVAL); | |
856 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 857 | |
93f1bcf4 LP |
858 | /* We don't allow recursively invoking sd_resolve_process(). */ |
859 | assert_return(!resolve->current, -EBUSY); | |
e963e3ad | 860 | |
93f1bcf4 LP |
861 | l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); |
862 | if (l < 0) { | |
863 | if (errno == EAGAIN) | |
864 | return 0; | |
968d3d24 | 865 | |
93f1bcf4 LP |
866 | return -errno; |
867 | } | |
868 | if (l == 0) | |
869 | return -ECONNREFUSED; | |
e963e3ad | 870 | |
93f1bcf4 LP |
871 | r = handle_response(resolve, &buf.packet, (size_t) l); |
872 | if (r < 0) | |
873 | return r; | |
e963e3ad | 874 | |
93f1bcf4 | 875 | return 1; |
968d3d24 | 876 | } |
e963e3ad | 877 | |
968d3d24 LP |
878 | _public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { |
879 | int r; | |
e963e3ad | 880 | |
968d3d24 LP |
881 | assert_return(resolve, -EINVAL); |
882 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 883 | |
93f1bcf4 | 884 | if (resolve->n_done >= resolve->n_queries) |
968d3d24 | 885 | return 0; |
e963e3ad | 886 | |
968d3d24 LP |
887 | do { |
888 | r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); | |
889 | } while (r == -EINTR); | |
e963e3ad | 890 | |
968d3d24 LP |
891 | if (r < 0) |
892 | return r; | |
e963e3ad | 893 | |
968d3d24 | 894 | return sd_resolve_process(resolve); |
e963e3ad DB |
895 | } |
896 | ||
4a134c49 | 897 | static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { |
4f809256 | 898 | sd_resolve_query *q; |
968d3d24 LP |
899 | int r; |
900 | ||
3bedba4a | 901 | assert(resolve); |
968d3d24 | 902 | assert(_q); |
e963e3ad | 903 | |
968d3d24 LP |
904 | if (resolve->n_queries >= QUERIES_MAX) |
905 | return -ENOBUFS; | |
906 | ||
907 | r = start_threads(resolve, 1); | |
908 | if (r < 0) | |
909 | return r; | |
e963e3ad | 910 | |
85529c81 | 911 | while (resolve->query_array[resolve->current_id % QUERIES_MAX]) |
3bedba4a | 912 | resolve->current_id++; |
e963e3ad | 913 | |
85529c81 | 914 | q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); |
968d3d24 LP |
915 | if (!q) |
916 | return -ENOMEM; | |
e963e3ad | 917 | |
93f1bcf4 | 918 | q->n_ref = 1; |
4a134c49 LP |
919 | q->resolve = resolve; |
920 | q->floating = floating; | |
85529c81 | 921 | q->id = resolve->current_id++; |
968d3d24 | 922 | |
4a134c49 LP |
923 | if (!floating) |
924 | sd_resolve_ref(resolve); | |
925 | ||
926 | LIST_PREPEND(queries, resolve->queries, q); | |
93f1bcf4 LP |
927 | resolve->n_queries++; |
928 | ||
968d3d24 LP |
929 | *_q = q; |
930 | return 0; | |
e963e3ad DB |
931 | } |
932 | ||
968d3d24 LP |
933 | _public_ int sd_resolve_getaddrinfo( |
934 | sd_resolve *resolve, | |
151b9b96 | 935 | sd_resolve_query **_q, |
93f1bcf4 LP |
936 | const char *node, const char *service, |
937 | const struct addrinfo *hints, | |
938 | sd_resolve_getaddrinfo_handler_t callback, void *userdata) { | |
968d3d24 LP |
939 | |
940 | AddrInfoRequest req = {}; | |
941 | struct msghdr mh = {}; | |
942 | struct iovec iov[3]; | |
4f809256 | 943 | sd_resolve_query *q; |
968d3d24 | 944 | int r; |
e963e3ad | 945 | |
968d3d24 | 946 | assert_return(resolve, -EINVAL); |
93f1bcf4 LP |
947 | assert_return(node || service, -EINVAL); |
948 | assert_return(callback, -EINVAL); | |
968d3d24 | 949 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 950 | |
4a134c49 | 951 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
952 | if (r < 0) |
953 | return r; | |
e963e3ad | 954 | |
93f1bcf4 LP |
955 | q->type = REQUEST_ADDRINFO; |
956 | q->getaddrinfo_handler = callback; | |
957 | q->userdata = userdata; | |
958 | ||
968d3d24 LP |
959 | req.node_len = node ? strlen(node)+1 : 0; |
960 | req.service_len = service ? strlen(service)+1 : 0; | |
e963e3ad | 961 | |
968d3d24 | 962 | req.header.id = q->id; |
93f1bcf4 | 963 | req.header.type = REQUEST_ADDRINFO; |
968d3d24 | 964 | req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; |
e963e3ad | 965 | |
968d3d24 LP |
966 | if (hints) { |
967 | req.hints_valid = true; | |
968 | req.ai_flags = hints->ai_flags; | |
969 | req.ai_family = hints->ai_family; | |
970 | req.ai_socktype = hints->ai_socktype; | |
971 | req.ai_protocol = hints->ai_protocol; | |
e963e3ad DB |
972 | } |
973 | ||
968d3d24 | 974 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; |
e963e3ad | 975 | if (node) |
968d3d24 | 976 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; |
e963e3ad | 977 | if (service) |
968d3d24 | 978 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; |
968d3d24 | 979 | mh.msg_iov = iov; |
e963e3ad | 980 | |
968d3d24 | 981 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 982 | sd_resolve_query_unref(q); |
968d3d24 LP |
983 | return -errno; |
984 | } | |
e963e3ad | 985 | |
96c76ac4 LP |
986 | resolve->n_outstanding++; |
987 | ||
4a134c49 LP |
988 | if (_q) |
989 | *_q = q; | |
990 | ||
968d3d24 | 991 | return 0; |
e963e3ad DB |
992 | } |
993 | ||
93f1bcf4 LP |
994 | static int getaddrinfo_done(sd_resolve_query* q) { |
995 | assert(q); | |
996 | assert(q->done); | |
997 | assert(q->getaddrinfo_handler); | |
e963e3ad | 998 | |
93f1bcf4 LP |
999 | errno = q->_errno; |
1000 | h_errno = q->_h_errno; | |
e963e3ad | 1001 | |
93f1bcf4 | 1002 | return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); |
e963e3ad DB |
1003 | } |
1004 | ||
968d3d24 LP |
1005 | _public_ int sd_resolve_getnameinfo( |
1006 | sd_resolve *resolve, | |
151b9b96 | 1007 | sd_resolve_query**_q, |
968d3d24 LP |
1008 | const struct sockaddr *sa, socklen_t salen, |
1009 | int flags, | |
93f1bcf4 LP |
1010 | uint64_t get, |
1011 | sd_resolve_getnameinfo_handler_t callback, | |
1012 | void *userdata) { | |
e963e3ad | 1013 | |
968d3d24 LP |
1014 | NameInfoRequest req = {}; |
1015 | struct msghdr mh = {}; | |
1016 | struct iovec iov[2]; | |
1017 | sd_resolve_query *q; | |
1018 | int r; | |
e963e3ad | 1019 | |
968d3d24 LP |
1020 | assert_return(resolve, -EINVAL); |
1021 | assert_return(sa, -EINVAL); | |
1022 | assert_return(salen >= sizeof(struct sockaddr), -EINVAL); | |
1023 | assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); | |
93f1bcf4 LP |
1024 | assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); |
1025 | assert_return(callback, -EINVAL); | |
968d3d24 | 1026 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 1027 | |
4a134c49 | 1028 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
1029 | if (r < 0) |
1030 | return r; | |
e963e3ad | 1031 | |
93f1bcf4 LP |
1032 | q->type = REQUEST_NAMEINFO; |
1033 | q->getnameinfo_handler = callback; | |
1034 | q->userdata = userdata; | |
1035 | ||
968d3d24 | 1036 | req.header.id = q->id; |
93f1bcf4 | 1037 | req.header.type = REQUEST_NAMEINFO; |
968d3d24 | 1038 | req.header.length = sizeof(NameInfoRequest) + salen; |
e963e3ad | 1039 | |
968d3d24 LP |
1040 | req.flags = flags; |
1041 | req.sockaddr_len = salen; | |
93f1bcf4 LP |
1042 | req.gethost = !!(get & SD_RESOLVE_GET_HOST); |
1043 | req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); | |
e963e3ad | 1044 | |
968d3d24 LP |
1045 | iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; |
1046 | iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; | |
e963e3ad | 1047 | |
968d3d24 LP |
1048 | mh.msg_iov = iov; |
1049 | mh.msg_iovlen = 2; | |
e963e3ad | 1050 | |
968d3d24 | 1051 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 1052 | sd_resolve_query_unref(q); |
968d3d24 LP |
1053 | return -errno; |
1054 | } | |
e963e3ad | 1055 | |
96c76ac4 LP |
1056 | resolve->n_outstanding++; |
1057 | ||
4a134c49 LP |
1058 | if (_q) |
1059 | *_q = q; | |
1060 | ||
968d3d24 | 1061 | return 0; |
e963e3ad DB |
1062 | } |
1063 | ||
93f1bcf4 | 1064 | static int getnameinfo_done(sd_resolve_query *q) { |
968d3d24 | 1065 | |
93f1bcf4 LP |
1066 | assert(q); |
1067 | assert(q->done); | |
1068 | assert(q->getnameinfo_handler); | |
e963e3ad | 1069 | |
93f1bcf4 LP |
1070 | errno = q->_errno; |
1071 | h_errno= q->_h_errno; | |
e963e3ad | 1072 | |
93f1bcf4 | 1073 | return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); |
e963e3ad DB |
1074 | } |
1075 | ||
93f1bcf4 LP |
1076 | _public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { |
1077 | assert_return(q, NULL); | |
e963e3ad | 1078 | |
93f1bcf4 LP |
1079 | assert(q->n_ref >= 1); |
1080 | q->n_ref++; | |
968d3d24 | 1081 | |
93f1bcf4 | 1082 | return q; |
e963e3ad DB |
1083 | } |
1084 | ||
93f1bcf4 LP |
1085 | static void resolve_freeaddrinfo(struct addrinfo *ai) { |
1086 | while (ai) { | |
1087 | struct addrinfo *next = ai->ai_next; | |
e963e3ad | 1088 | |
93f1bcf4 LP |
1089 | free(ai->ai_addr); |
1090 | free(ai->ai_canonname); | |
1091 | free(ai); | |
1092 | ai = next; | |
1093 | } | |
1094 | } | |
e963e3ad | 1095 | |
4a134c49 LP |
1096 | static void resolve_query_disconnect(sd_resolve_query *q) { |
1097 | sd_resolve *resolve; | |
93f1bcf4 | 1098 | unsigned i; |
e963e3ad | 1099 | |
93f1bcf4 | 1100 | assert(q); |
4a134c49 LP |
1101 | |
1102 | if (!q->resolve) | |
1103 | return; | |
1104 | ||
1105 | resolve = q->resolve; | |
1106 | assert(resolve->n_queries > 0); | |
e963e3ad | 1107 | |
968d3d24 | 1108 | if (q->done) { |
4a134c49 LP |
1109 | assert(resolve->n_done > 0); |
1110 | resolve->n_done--; | |
e963e3ad DB |
1111 | } |
1112 | ||
968d3d24 | 1113 | i = q->id % QUERIES_MAX; |
4a134c49 LP |
1114 | assert(resolve->query_array[i] == q); |
1115 | resolve->query_array[i] = NULL; | |
1116 | LIST_REMOVE(queries, resolve->queries, q); | |
1117 | resolve->n_queries--; | |
1118 | ||
1119 | q->resolve = NULL; | |
1120 | if (!q->floating) | |
1121 | sd_resolve_unref(resolve); | |
1122 | } | |
1123 | ||
1124 | static void resolve_query_free(sd_resolve_query *q) { | |
1125 | assert(q); | |
1126 | ||
1127 | resolve_query_disconnect(q); | |
e963e3ad | 1128 | |
93f1bcf4 | 1129 | resolve_freeaddrinfo(q->addrinfo); |
e963e3ad DB |
1130 | free(q->host); |
1131 | free(q->serv); | |
e963e3ad | 1132 | free(q); |
e963e3ad DB |
1133 | } |
1134 | ||
93f1bcf4 LP |
1135 | _public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { |
1136 | if (!q) | |
1137 | return NULL; | |
e963e3ad | 1138 | |
93f1bcf4 LP |
1139 | assert(q->n_ref >= 1); |
1140 | q->n_ref--; | |
e963e3ad | 1141 | |
93f1bcf4 LP |
1142 | if (q->n_ref <= 0) |
1143 | resolve_query_free(q); | |
e963e3ad | 1144 | |
93f1bcf4 | 1145 | return NULL; |
e963e3ad DB |
1146 | } |
1147 | ||
93f1bcf4 | 1148 | _public_ int sd_resolve_query_is_done(sd_resolve_query *q) { |
968d3d24 LP |
1149 | assert_return(q, -EINVAL); |
1150 | assert_return(!resolve_pid_changed(q->resolve), -ECHILD); | |
e963e3ad DB |
1151 | |
1152 | return q->done; | |
1153 | } | |
1154 | ||
93f1bcf4 | 1155 | _public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { |
968d3d24 | 1156 | void *ret; |
e963e3ad | 1157 | |
968d3d24 LP |
1158 | assert_return(q, NULL); |
1159 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1160 | ||
1161 | ret = q->userdata; | |
e963e3ad | 1162 | q->userdata = userdata; |
968d3d24 LP |
1163 | |
1164 | return ret; | |
e963e3ad DB |
1165 | } |
1166 | ||
93f1bcf4 | 1167 | _public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { |
968d3d24 LP |
1168 | assert_return(q, NULL); |
1169 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
e963e3ad DB |
1170 | |
1171 | return q->userdata; | |
1172 | } | |
93f1bcf4 LP |
1173 | |
1174 | _public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { | |
1175 | assert_return(q, NULL); | |
1176 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1177 | ||
1178 | return q->resolve; | |
1179 | } | |
1180 | ||
1181 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1182 | sd_resolve *resolve = userdata; | |
1183 | int r; | |
1184 | ||
1185 | assert(resolve); | |
1186 | ||
1187 | r = sd_resolve_process(resolve); | |
1188 | if (r < 0) | |
1189 | return r; | |
1190 | ||
1191 | return 1; | |
1192 | } | |
1193 | ||
32d20645 | 1194 | _public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int64_t priority) { |
93f1bcf4 LP |
1195 | int r; |
1196 | ||
1197 | assert_return(resolve, -EINVAL); | |
1198 | assert_return(!resolve->event, -EBUSY); | |
1199 | ||
1200 | assert(!resolve->event_source); | |
1201 | ||
1202 | if (event) | |
1203 | resolve->event = sd_event_ref(event); | |
1204 | else { | |
1205 | r = sd_event_default(&resolve->event); | |
1206 | if (r < 0) | |
1207 | return r; | |
1208 | } | |
1209 | ||
1210 | r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); | |
1211 | if (r < 0) | |
1212 | goto fail; | |
1213 | ||
1214 | r = sd_event_source_set_priority(resolve->event_source, priority); | |
1215 | if (r < 0) | |
1216 | goto fail; | |
1217 | ||
1218 | return 0; | |
1219 | ||
1220 | fail: | |
1221 | sd_resolve_detach_event(resolve); | |
1222 | return r; | |
1223 | } | |
1224 | ||
1225 | _public_ int sd_resolve_detach_event(sd_resolve *resolve) { | |
1226 | assert_return(resolve, -EINVAL); | |
1227 | ||
1228 | if (!resolve->event) | |
1229 | return 0; | |
1230 | ||
1231 | if (resolve->event_source) { | |
1232 | sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); | |
1233 | resolve->event_source = sd_event_source_unref(resolve->event_source); | |
1234 | } | |
1235 | ||
1236 | resolve->event = sd_event_unref(resolve->event); | |
1237 | return 1; | |
1238 | } | |
1239 | ||
1240 | _public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { | |
1241 | assert_return(resolve, NULL); | |
1242 | ||
1243 | return resolve->event; | |
1244 | } |