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edc6f2f5 TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
e963e3ad | 3 | /*** |
edc6f2f5 | 4 | This file is part of systemd. |
e963e3ad DB |
5 | |
6 | Copyright 2005-2008 Lennart Poettering | |
7 | ||
edc6f2f5 TG |
8 | systemd is free software; you can redistribute it and/or modify it |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
e963e3ad | 12 | |
edc6f2f5 | 13 | systemd is distributed in the hope that it will be useful, but |
e963e3ad DB |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
edc6f2f5 TG |
18 | You should have received a copy of the GNU Lesser General Public License |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
e963e3ad | 21 | |
e963e3ad | 22 | #include <errno.h> |
07630cea LP |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
e963e3ad | 25 | #include <resolv.h> |
07630cea | 26 | #include <signal.h> |
e963e3ad | 27 | #include <stdint.h> |
07630cea LP |
28 | #include <stdio.h> |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
e963e3ad | 31 | #include <sys/prctl.h> |
07630cea LP |
32 | #include <unistd.h> |
33 | ||
34 | #include "sd-resolve.h" | |
e963e3ad | 35 | |
b5efdb8a | 36 | #include "alloc-util.h" |
3ffd4af2 | 37 | #include "fd-util.h" |
c004493c | 38 | #include "io-util.h" |
968d3d24 | 39 | #include "list.h" |
93f1bcf4 | 40 | #include "missing.h" |
07630cea LP |
41 | #include "socket-util.h" |
42 | #include "util.h" | |
e963e3ad | 43 | |
93f1bcf4 LP |
44 | #define WORKERS_MIN 1U |
45 | #define WORKERS_MAX 16U | |
46 | #define QUERIES_MAX 256U | |
47 | #define BUFSIZE 10240U | |
e963e3ad DB |
48 | |
49 | typedef enum { | |
50 | REQUEST_ADDRINFO, | |
51 | RESPONSE_ADDRINFO, | |
52 | REQUEST_NAMEINFO, | |
53 | RESPONSE_NAMEINFO, | |
e963e3ad DB |
54 | REQUEST_TERMINATE, |
55 | RESPONSE_DIED | |
5599e866 | 56 | } QueryType; |
e963e3ad DB |
57 | |
58 | enum { | |
968d3d24 LP |
59 | REQUEST_RECV_FD, |
60 | REQUEST_SEND_FD, | |
61 | RESPONSE_RECV_FD, | |
62 | RESPONSE_SEND_FD, | |
63 | _FD_MAX | |
e963e3ad DB |
64 | }; |
65 | ||
3bedba4a | 66 | struct sd_resolve { |
93f1bcf4 LP |
67 | unsigned n_ref; |
68 | ||
968d3d24 LP |
69 | bool dead:1; |
70 | pid_t original_pid; | |
e963e3ad | 71 | |
968d3d24 | 72 | int fds[_FD_MAX]; |
e963e3ad | 73 | |
968d3d24 LP |
74 | pthread_t workers[WORKERS_MAX]; |
75 | unsigned n_valid_workers; | |
e963e3ad | 76 | |
85529c81 | 77 | unsigned current_id; |
4a134c49 | 78 | sd_resolve_query* query_array[QUERIES_MAX]; |
96c76ac4 | 79 | unsigned n_queries, n_done, n_outstanding; |
93f1bcf4 LP |
80 | |
81 | sd_event_source *event_source; | |
82 | sd_event *event; | |
e963e3ad | 83 | |
93f1bcf4 LP |
84 | sd_resolve_query *current; |
85 | ||
86 | sd_resolve **default_resolve_ptr; | |
87 | pid_t tid; | |
4a134c49 LP |
88 | |
89 | LIST_HEAD(sd_resolve_query, queries); | |
e963e3ad DB |
90 | }; |
91 | ||
3bedba4a | 92 | struct sd_resolve_query { |
93f1bcf4 LP |
93 | unsigned n_ref; |
94 | ||
4f809256 | 95 | sd_resolve *resolve; |
93f1bcf4 LP |
96 | |
97 | QueryType type:4; | |
968d3d24 | 98 | bool done:1; |
4a134c49 | 99 | bool floating:1; |
e963e3ad | 100 | unsigned id; |
968d3d24 | 101 | |
e963e3ad DB |
102 | int ret; |
103 | int _errno; | |
104 | int _h_errno; | |
105 | struct addrinfo *addrinfo; | |
106 | char *serv, *host; | |
968d3d24 | 107 | |
93f1bcf4 LP |
108 | union { |
109 | sd_resolve_getaddrinfo_handler_t getaddrinfo_handler; | |
110 | sd_resolve_getnameinfo_handler_t getnameinfo_handler; | |
93f1bcf4 | 111 | }; |
968d3d24 | 112 | |
93f1bcf4 | 113 | void *userdata; |
4a134c49 LP |
114 | |
115 | LIST_FIELDS(sd_resolve_query, queries); | |
e963e3ad DB |
116 | }; |
117 | ||
5599e866 DB |
118 | typedef struct RHeader { |
119 | QueryType type; | |
e963e3ad DB |
120 | unsigned id; |
121 | size_t length; | |
5599e866 | 122 | } RHeader; |
e963e3ad | 123 | |
5599e866 DB |
124 | typedef struct AddrInfoRequest { |
125 | struct RHeader header; | |
968d3d24 | 126 | bool hints_valid; |
e963e3ad DB |
127 | int ai_flags; |
128 | int ai_family; | |
129 | int ai_socktype; | |
130 | int ai_protocol; | |
131 | size_t node_len, service_len; | |
5599e866 | 132 | } AddrInfoRequest; |
e963e3ad | 133 | |
5599e866 DB |
134 | typedef struct AddrInfoResponse { |
135 | struct RHeader header; | |
e963e3ad DB |
136 | int ret; |
137 | int _errno; | |
138 | int _h_errno; | |
139 | /* followed by addrinfo_serialization[] */ | |
5599e866 | 140 | } AddrInfoResponse; |
e963e3ad | 141 | |
5599e866 | 142 | typedef struct AddrInfoSerialization { |
e963e3ad DB |
143 | int ai_flags; |
144 | int ai_family; | |
145 | int ai_socktype; | |
146 | int ai_protocol; | |
147 | size_t ai_addrlen; | |
148 | size_t canonname_len; | |
149 | /* Followed by ai_addr amd ai_canonname with variable lengths */ | |
5599e866 | 150 | } AddrInfoSerialization; |
e963e3ad | 151 | |
5599e866 DB |
152 | typedef struct NameInfoRequest { |
153 | struct RHeader header; | |
e963e3ad DB |
154 | int flags; |
155 | socklen_t sockaddr_len; | |
968d3d24 | 156 | bool gethost:1, getserv:1; |
5599e866 | 157 | } NameInfoRequest; |
e963e3ad | 158 | |
5599e866 DB |
159 | typedef struct NameInfoResponse { |
160 | struct RHeader header; | |
e963e3ad DB |
161 | size_t hostlen, servlen; |
162 | int ret; | |
163 | int _errno; | |
164 | int _h_errno; | |
5599e866 | 165 | } NameInfoResponse; |
e963e3ad | 166 | |
5599e866 DB |
167 | typedef union Packet { |
168 | RHeader rheader; | |
169 | AddrInfoRequest addrinfo_request; | |
170 | AddrInfoResponse addrinfo_response; | |
171 | NameInfoRequest nameinfo_request; | |
172 | NameInfoResponse nameinfo_response; | |
5599e866 | 173 | } Packet; |
e963e3ad | 174 | |
93f1bcf4 LP |
175 | static int getaddrinfo_done(sd_resolve_query* q); |
176 | static int getnameinfo_done(sd_resolve_query *q); | |
93f1bcf4 | 177 | |
4a134c49 LP |
178 | static void resolve_query_disconnect(sd_resolve_query *q); |
179 | ||
93f1bcf4 | 180 | #define RESOLVE_DONT_DESTROY(resolve) \ |
4afd3348 | 181 | _cleanup_(sd_resolve_unrefp) _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) |
93f1bcf4 | 182 | |
e963e3ad | 183 | static int send_died(int out_fd) { |
968d3d24 | 184 | |
93f1bcf4 LP |
185 | RHeader rh = { |
186 | .type = RESPONSE_DIED, | |
187 | .length = sizeof(RHeader), | |
188 | }; | |
e963e3ad | 189 | |
93f1bcf4 | 190 | assert(out_fd >= 0); |
e963e3ad | 191 | |
968d3d24 LP |
192 | if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0) |
193 | return -errno; | |
194 | ||
195 | return 0; | |
e963e3ad DB |
196 | } |
197 | ||
198 | static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) { | |
5599e866 | 199 | AddrInfoSerialization s; |
e963e3ad | 200 | size_t cnl, l; |
968d3d24 | 201 | |
e963e3ad DB |
202 | assert(p); |
203 | assert(ai); | |
204 | assert(length); | |
205 | assert(*length <= maxlength); | |
206 | ||
968d3d24 | 207 | cnl = ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0; |
5599e866 | 208 | l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl; |
e963e3ad DB |
209 | |
210 | if (*length + l > maxlength) | |
211 | return NULL; | |
212 | ||
213 | s.ai_flags = ai->ai_flags; | |
214 | s.ai_family = ai->ai_family; | |
215 | s.ai_socktype = ai->ai_socktype; | |
216 | s.ai_protocol = ai->ai_protocol; | |
217 | s.ai_addrlen = ai->ai_addrlen; | |
218 | s.canonname_len = cnl; | |
219 | ||
5599e866 DB |
220 | memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization)); |
221 | memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen); | |
e963e3ad DB |
222 | |
223 | if (ai->ai_canonname) | |
968d3d24 | 224 | memcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, ai->ai_canonname, cnl); |
e963e3ad DB |
225 | |
226 | *length += l; | |
227 | return (uint8_t*) p + l; | |
228 | } | |
229 | ||
968d3d24 LP |
230 | static int send_addrinfo_reply( |
231 | int out_fd, | |
232 | unsigned id, | |
233 | int ret, | |
234 | struct addrinfo *ai, | |
235 | int _errno, | |
236 | int _h_errno) { | |
237 | ||
93f1bcf4 LP |
238 | AddrInfoResponse resp = { |
239 | .header.type = RESPONSE_ADDRINFO, | |
240 | .header.id = id, | |
241 | .header.length = sizeof(AddrInfoResponse), | |
242 | .ret = ret, | |
243 | ._errno = _errno, | |
244 | ._h_errno = _h_errno, | |
245 | }; | |
246 | ||
968d3d24 LP |
247 | struct msghdr mh = {}; |
248 | struct iovec iov[2]; | |
249 | union { | |
250 | AddrInfoSerialization ais; | |
251 | uint8_t space[BUFSIZE]; | |
252 | } buffer; | |
253 | ||
e963e3ad DB |
254 | assert(out_fd >= 0); |
255 | ||
e963e3ad | 256 | if (ret == 0 && ai) { |
968d3d24 | 257 | void *p = &buffer; |
e963e3ad DB |
258 | struct addrinfo *k; |
259 | ||
260 | for (k = ai; k; k = k->ai_next) { | |
968d3d24 | 261 | p = serialize_addrinfo(p, k, &resp.header.length, (uint8_t*) &buffer + BUFSIZE - (uint8_t*) p); |
8e50b5a7 | 262 | if (!p) { |
968d3d24 LP |
263 | freeaddrinfo(ai); |
264 | return -ENOBUFS; | |
e963e3ad DB |
265 | } |
266 | } | |
267 | } | |
268 | ||
269 | if (ai) | |
270 | freeaddrinfo(ai); | |
271 | ||
968d3d24 LP |
272 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(AddrInfoResponse) }; |
273 | iov[1] = (struct iovec) { .iov_base = &buffer, .iov_len = resp.header.length - sizeof(AddrInfoResponse) }; | |
274 | ||
275 | mh.msg_iov = iov; | |
276 | mh.msg_iovlen = ELEMENTSOF(iov); | |
277 | ||
278 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) | |
279 | return -errno; | |
280 | ||
281 | return 0; | |
e963e3ad DB |
282 | } |
283 | ||
968d3d24 LP |
284 | static int send_nameinfo_reply( |
285 | int out_fd, | |
286 | unsigned id, | |
287 | int ret, | |
288 | const char *host, | |
289 | const char *serv, | |
290 | int _errno, | |
291 | int _h_errno) { | |
292 | ||
93f1bcf4 LP |
293 | NameInfoResponse resp = { |
294 | .header.type = RESPONSE_NAMEINFO, | |
295 | .header.id = id, | |
296 | .ret = ret, | |
297 | ._errno = _errno, | |
298 | ._h_errno = _h_errno, | |
299 | }; | |
300 | ||
968d3d24 LP |
301 | struct msghdr mh = {}; |
302 | struct iovec iov[3]; | |
e963e3ad | 303 | size_t hl, sl; |
e963e3ad DB |
304 | |
305 | assert(out_fd >= 0); | |
306 | ||
307 | sl = serv ? strlen(serv)+1 : 0; | |
308 | hl = host ? strlen(host)+1 : 0; | |
309 | ||
968d3d24 | 310 | resp.header.length = sizeof(NameInfoResponse) + hl + sl; |
968d3d24 LP |
311 | resp.hostlen = hl; |
312 | resp.servlen = sl; | |
e963e3ad | 313 | |
968d3d24 LP |
314 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(NameInfoResponse) }; |
315 | iov[1] = (struct iovec) { .iov_base = (void*) host, .iov_len = hl }; | |
316 | iov[2] = (struct iovec) { .iov_base = (void*) serv, .iov_len = sl }; | |
e963e3ad | 317 | |
968d3d24 LP |
318 | mh.msg_iov = iov; |
319 | mh.msg_iovlen = ELEMENTSOF(iov); | |
e963e3ad | 320 | |
968d3d24 LP |
321 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) |
322 | return -errno; | |
e963e3ad | 323 | |
968d3d24 | 324 | return 0; |
e963e3ad DB |
325 | } |
326 | ||
5599e866 DB |
327 | static int handle_request(int out_fd, const Packet *packet, size_t length) { |
328 | const RHeader *req; | |
968d3d24 | 329 | |
e963e3ad | 330 | assert(out_fd >= 0); |
968d3d24 | 331 | assert(packet); |
e963e3ad DB |
332 | |
333 | req = &packet->rheader; | |
968d3d24 | 334 | |
5599e866 | 335 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
336 | assert(length == req->length); |
337 | ||
338 | switch (req->type) { | |
968d3d24 | 339 | |
e963e3ad | 340 | case REQUEST_ADDRINFO: { |
5599e866 | 341 | const AddrInfoRequest *ai_req = &packet->addrinfo_request; |
968d3d24 | 342 | struct addrinfo hints = {}, *result = NULL; |
e963e3ad DB |
343 | const char *node, *service; |
344 | int ret; | |
345 | ||
5599e866 DB |
346 | assert(length >= sizeof(AddrInfoRequest)); |
347 | assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len); | |
e963e3ad | 348 | |
968d3d24 LP |
349 | hints.ai_flags = ai_req->ai_flags; |
350 | hints.ai_family = ai_req->ai_family; | |
351 | hints.ai_socktype = ai_req->ai_socktype; | |
352 | hints.ai_protocol = ai_req->ai_protocol; | |
e963e3ad | 353 | |
5599e866 DB |
354 | node = ai_req->node_len ? (const char*) ai_req + sizeof(AddrInfoRequest) : NULL; |
355 | service = ai_req->service_len ? (const char*) ai_req + sizeof(AddrInfoRequest) + ai_req->node_len : NULL; | |
e963e3ad | 356 | |
968d3d24 LP |
357 | ret = getaddrinfo( |
358 | node, service, | |
359 | ai_req->hints_valid ? &hints : NULL, | |
e963e3ad DB |
360 | &result); |
361 | ||
362 | /* send_addrinfo_reply() frees result */ | |
363 | return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno); | |
364 | } | |
365 | ||
366 | case REQUEST_NAMEINFO: { | |
5599e866 | 367 | const NameInfoRequest *ni_req = &packet->nameinfo_request; |
e963e3ad | 368 | char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; |
968d3d24 LP |
369 | union sockaddr_union sa; |
370 | int ret; | |
e963e3ad | 371 | |
5599e866 DB |
372 | assert(length >= sizeof(NameInfoRequest)); |
373 | assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len); | |
968d3d24 | 374 | assert(sizeof(sa) >= ni_req->sockaddr_len); |
e963e3ad | 375 | |
5599e866 | 376 | memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len); |
e963e3ad | 377 | |
968d3d24 | 378 | ret = getnameinfo(&sa.sa, ni_req->sockaddr_len, |
e963e3ad DB |
379 | ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0, |
380 | ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0, | |
381 | ni_req->flags); | |
382 | ||
383 | return send_nameinfo_reply(out_fd, req->id, ret, | |
384 | ret == 0 && ni_req->gethost ? hostbuf : NULL, | |
385 | ret == 0 && ni_req->getserv ? servbuf : NULL, | |
386 | errno, h_errno); | |
387 | } | |
388 | ||
e963e3ad DB |
389 | case REQUEST_TERMINATE: |
390 | /* Quit */ | |
968d3d24 | 391 | return -ECONNRESET; |
e963e3ad DB |
392 | |
393 | default: | |
968d3d24 | 394 | assert_not_reached("Unknown request"); |
e963e3ad DB |
395 | } |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static void* thread_worker(void *p) { | |
4f809256 | 401 | sd_resolve *resolve = p; |
e963e3ad DB |
402 | sigset_t fullset; |
403 | ||
404 | /* No signals in this thread please */ | |
968d3d24 LP |
405 | assert_se(sigfillset(&fullset) == 0); |
406 | assert_se(pthread_sigmask(SIG_BLOCK, &fullset, NULL) == 0); | |
407 | ||
408 | /* Assign a pretty name to this thread */ | |
409 | prctl(PR_SET_NAME, (unsigned long) "sd-resolve"); | |
e963e3ad | 410 | |
3bedba4a | 411 | while (!resolve->dead) { |
968d3d24 LP |
412 | union { |
413 | Packet packet; | |
414 | uint8_t space[BUFSIZE]; | |
415 | } buf; | |
e963e3ad DB |
416 | ssize_t length; |
417 | ||
968d3d24 LP |
418 | length = recv(resolve->fds[REQUEST_RECV_FD], &buf, sizeof(buf), 0); |
419 | if (length < 0) { | |
420 | if (errno == EINTR) | |
e963e3ad | 421 | continue; |
968d3d24 | 422 | |
e963e3ad DB |
423 | break; |
424 | } | |
968d3d24 LP |
425 | if (length == 0) |
426 | break; | |
e963e3ad | 427 | |
3bedba4a | 428 | if (resolve->dead) |
e963e3ad DB |
429 | break; |
430 | ||
968d3d24 | 431 | if (handle_request(resolve->fds[RESPONSE_SEND_FD], &buf.packet, (size_t) length) < 0) |
e963e3ad DB |
432 | break; |
433 | } | |
434 | ||
3bedba4a | 435 | send_died(resolve->fds[RESPONSE_SEND_FD]); |
e963e3ad DB |
436 | |
437 | return NULL; | |
438 | } | |
439 | ||
968d3d24 LP |
440 | static int start_threads(sd_resolve *resolve, unsigned extra) { |
441 | unsigned n; | |
442 | int r; | |
e963e3ad | 443 | |
96c76ac4 | 444 | n = resolve->n_outstanding + extra; |
93f1bcf4 | 445 | n = CLAMP(n, WORKERS_MIN, WORKERS_MAX); |
e963e3ad | 446 | |
968d3d24 LP |
447 | while (resolve->n_valid_workers < n) { |
448 | ||
449 | r = pthread_create(&resolve->workers[resolve->n_valid_workers], NULL, thread_worker, resolve); | |
450 | if (r != 0) | |
451 | return -r; | |
452 | ||
453 | resolve->n_valid_workers ++; | |
e963e3ad DB |
454 | } |
455 | ||
968d3d24 LP |
456 | return 0; |
457 | } | |
458 | ||
459 | static bool resolve_pid_changed(sd_resolve *r) { | |
460 | assert(r); | |
461 | ||
462 | /* We don't support people creating a resolver and keeping it | |
463 | * around after fork(). Let's complain. */ | |
464 | ||
465 | return r->original_pid != getpid(); | |
466 | } | |
e963e3ad | 467 | |
968d3d24 LP |
468 | _public_ int sd_resolve_new(sd_resolve **ret) { |
469 | sd_resolve *resolve = NULL; | |
470 | int i, r; | |
471 | ||
472 | assert_return(ret, -EINVAL); | |
473 | ||
474 | resolve = new0(sd_resolve, 1); | |
475 | if (!resolve) | |
476 | return -ENOMEM; | |
477 | ||
93f1bcf4 LP |
478 | resolve->n_ref = 1; |
479 | resolve->original_pid = getpid(); | |
480 | ||
968d3d24 | 481 | for (i = 0; i < _FD_MAX; i++) |
3bedba4a | 482 | resolve->fds[i] = -1; |
e963e3ad | 483 | |
968d3d24 LP |
484 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + REQUEST_RECV_FD); |
485 | if (r < 0) { | |
486 | r = -errno; | |
8a6233fb | 487 | goto fail; |
968d3d24 | 488 | } |
e963e3ad | 489 | |
968d3d24 LP |
490 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + RESPONSE_RECV_FD); |
491 | if (r < 0) { | |
492 | r = -errno; | |
8a6233fb | 493 | goto fail; |
e963e3ad DB |
494 | } |
495 | ||
968d3d24 LP |
496 | fd_inc_sndbuf(resolve->fds[REQUEST_SEND_FD], QUERIES_MAX * BUFSIZE); |
497 | fd_inc_rcvbuf(resolve->fds[REQUEST_RECV_FD], QUERIES_MAX * BUFSIZE); | |
498 | fd_inc_sndbuf(resolve->fds[RESPONSE_SEND_FD], QUERIES_MAX * BUFSIZE); | |
499 | fd_inc_rcvbuf(resolve->fds[RESPONSE_RECV_FD], QUERIES_MAX * BUFSIZE); | |
e963e3ad | 500 | |
3bedba4a | 501 | fd_nonblock(resolve->fds[RESPONSE_RECV_FD], true); |
e963e3ad | 502 | |
968d3d24 LP |
503 | *ret = resolve; |
504 | return 0; | |
e963e3ad DB |
505 | |
506 | fail: | |
93f1bcf4 | 507 | sd_resolve_unref(resolve); |
968d3d24 | 508 | return r; |
e963e3ad DB |
509 | } |
510 | ||
93f1bcf4 LP |
511 | _public_ int sd_resolve_default(sd_resolve **ret) { |
512 | ||
513 | static thread_local sd_resolve *default_resolve = NULL; | |
514 | sd_resolve *e = NULL; | |
515 | int r; | |
516 | ||
517 | if (!ret) | |
518 | return !!default_resolve; | |
519 | ||
520 | if (default_resolve) { | |
521 | *ret = sd_resolve_ref(default_resolve); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | r = sd_resolve_new(&e); | |
526 | if (r < 0) | |
527 | return r; | |
528 | ||
529 | e->default_resolve_ptr = &default_resolve; | |
530 | e->tid = gettid(); | |
531 | default_resolve = e; | |
532 | ||
533 | *ret = e; | |
534 | return 1; | |
535 | } | |
536 | ||
537 | _public_ int sd_resolve_get_tid(sd_resolve *resolve, pid_t *tid) { | |
538 | assert_return(resolve, -EINVAL); | |
539 | assert_return(tid, -EINVAL); | |
540 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
541 | ||
542 | if (resolve->tid != 0) { | |
543 | *tid = resolve->tid; | |
544 | return 0; | |
545 | } | |
546 | ||
547 | if (resolve->event) | |
548 | return sd_event_get_tid(resolve->event, tid); | |
549 | ||
550 | return -ENXIO; | |
551 | } | |
e963e3ad | 552 | |
93f1bcf4 LP |
553 | static void resolve_free(sd_resolve *resolve) { |
554 | PROTECT_ERRNO; | |
4a134c49 | 555 | sd_resolve_query *q; |
968d3d24 | 556 | unsigned i; |
e963e3ad | 557 | |
93f1bcf4 LP |
558 | assert(resolve); |
559 | ||
4a134c49 LP |
560 | while ((q = resolve->queries)) { |
561 | assert(q->floating); | |
562 | resolve_query_disconnect(q); | |
563 | sd_resolve_query_unref(q); | |
564 | } | |
565 | ||
93f1bcf4 LP |
566 | if (resolve->default_resolve_ptr) |
567 | *(resolve->default_resolve_ptr) = NULL; | |
968d3d24 LP |
568 | |
569 | resolve->dead = true; | |
e963e3ad | 570 | |
93f1bcf4 LP |
571 | sd_resolve_detach_event(resolve); |
572 | ||
3bedba4a | 573 | if (resolve->fds[REQUEST_SEND_FD] >= 0) { |
e963e3ad | 574 | |
968d3d24 LP |
575 | RHeader req = { |
576 | .type = REQUEST_TERMINATE, | |
577 | .length = sizeof(req) | |
578 | }; | |
e963e3ad DB |
579 | |
580 | /* Send one termination packet for each worker */ | |
968d3d24 | 581 | for (i = 0; i < resolve->n_valid_workers; i++) |
e62d9b81 | 582 | (void) send(resolve->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); |
e963e3ad DB |
583 | } |
584 | ||
585 | /* Now terminate them and wait until they are gone. */ | |
5263a45b MS |
586 | for (i = 0; i < resolve->n_valid_workers; i++) |
587 | pthread_join(resolve->workers[i], NULL); | |
e963e3ad DB |
588 | |
589 | /* Close all communication channels */ | |
968d3d24 | 590 | for (i = 0; i < _FD_MAX; i++) |
03e334a1 | 591 | safe_close(resolve->fds[i]); |
e963e3ad | 592 | |
3bedba4a | 593 | free(resolve); |
93f1bcf4 LP |
594 | } |
595 | ||
596 | _public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { | |
597 | assert_return(resolve, NULL); | |
598 | ||
599 | assert(resolve->n_ref >= 1); | |
600 | resolve->n_ref++; | |
601 | ||
602 | return resolve; | |
603 | } | |
604 | ||
605 | _public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { | |
606 | ||
607 | if (!resolve) | |
608 | return NULL; | |
609 | ||
610 | assert(resolve->n_ref >= 1); | |
611 | resolve->n_ref--; | |
612 | ||
613 | if (resolve->n_ref <= 0) | |
614 | resolve_free(resolve); | |
615 | ||
968d3d24 | 616 | return NULL; |
e963e3ad DB |
617 | } |
618 | ||
968d3d24 LP |
619 | _public_ int sd_resolve_get_fd(sd_resolve *resolve) { |
620 | assert_return(resolve, -EINVAL); | |
621 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 622 | |
3bedba4a | 623 | return resolve->fds[RESPONSE_RECV_FD]; |
e963e3ad DB |
624 | } |
625 | ||
968d3d24 LP |
626 | _public_ int sd_resolve_get_events(sd_resolve *resolve) { |
627 | assert_return(resolve, -EINVAL); | |
628 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
629 | ||
630 | return resolve->n_queries > resolve->n_done ? POLLIN : 0; | |
631 | } | |
632 | ||
633 | _public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { | |
634 | assert_return(resolve, -EINVAL); | |
635 | assert_return(usec, -EINVAL); | |
636 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
637 | ||
638 | *usec = (uint64_t) -1; | |
639 | return 0; | |
640 | } | |
641 | ||
4f809256 DB |
642 | static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { |
643 | sd_resolve_query *q; | |
968d3d24 | 644 | |
3bedba4a | 645 | assert(resolve); |
e963e3ad | 646 | |
4a134c49 | 647 | q = resolve->query_array[id % QUERIES_MAX]; |
8e50b5a7 | 648 | if (q) |
e963e3ad DB |
649 | if (q->id == id) |
650 | return q; | |
651 | ||
652 | return NULL; | |
653 | } | |
654 | ||
93f1bcf4 LP |
655 | static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { |
656 | int r; | |
657 | ||
e963e3ad DB |
658 | assert(q); |
659 | assert(!q->done); | |
93f1bcf4 | 660 | assert(q->resolve == resolve); |
e963e3ad | 661 | |
968d3d24 | 662 | q->done = true; |
93f1bcf4 LP |
663 | resolve->n_done ++; |
664 | ||
73dec319 | 665 | resolve->current = sd_resolve_query_ref(q); |
93f1bcf4 LP |
666 | |
667 | switch (q->type) { | |
668 | ||
669 | case REQUEST_ADDRINFO: | |
670 | r = getaddrinfo_done(q); | |
671 | break; | |
672 | ||
673 | case REQUEST_NAMEINFO: | |
674 | r = getnameinfo_done(q); | |
675 | break; | |
676 | ||
93f1bcf4 LP |
677 | default: |
678 | assert_not_reached("Cannot complete unknown query type"); | |
679 | } | |
680 | ||
502fe44e | 681 | resolve->current = NULL; |
93f1bcf4 | 682 | |
4a134c49 LP |
683 | if (q->floating) { |
684 | resolve_query_disconnect(q); | |
f2e2415d | 685 | sd_resolve_query_unref(q); |
4a134c49 LP |
686 | } |
687 | ||
502fe44e LP |
688 | sd_resolve_query_unref(q); |
689 | ||
93f1bcf4 | 690 | return r; |
e963e3ad DB |
691 | } |
692 | ||
968d3d24 | 693 | static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { |
5599e866 | 694 | AddrInfoSerialization s; |
e963e3ad DB |
695 | size_t l; |
696 | struct addrinfo *ai; | |
968d3d24 | 697 | |
e963e3ad | 698 | assert(p); |
968d3d24 | 699 | assert(*p); |
e963e3ad DB |
700 | assert(ret_ai); |
701 | assert(length); | |
702 | ||
5599e866 | 703 | if (*length < sizeof(AddrInfoSerialization)) |
968d3d24 | 704 | return -EBADMSG; |
e963e3ad | 705 | |
968d3d24 | 706 | memcpy(&s, *p, sizeof(s)); |
e963e3ad | 707 | |
5599e866 | 708 | l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; |
e963e3ad | 709 | if (*length < l) |
968d3d24 | 710 | return -EBADMSG; |
e963e3ad | 711 | |
968d3d24 | 712 | ai = new0(struct addrinfo, 1); |
8e50b5a7 | 713 | if (!ai) |
968d3d24 | 714 | return -ENOMEM; |
e963e3ad DB |
715 | |
716 | ai->ai_flags = s.ai_flags; | |
717 | ai->ai_family = s.ai_family; | |
718 | ai->ai_socktype = s.ai_socktype; | |
719 | ai->ai_protocol = s.ai_protocol; | |
720 | ai->ai_addrlen = s.ai_addrlen; | |
721 | ||
968d3d24 LP |
722 | if (s.ai_addrlen > 0) { |
723 | ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); | |
724 | if (!ai->ai_addr) { | |
725 | free(ai); | |
726 | return -ENOMEM; | |
727 | } | |
728 | } | |
e963e3ad | 729 | |
968d3d24 LP |
730 | if (s.canonname_len > 0) { |
731 | ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); | |
732 | if (!ai->ai_canonname) { | |
733 | free(ai->ai_addr); | |
734 | free(ai); | |
735 | return -ENOMEM; | |
736 | } | |
737 | } | |
e963e3ad DB |
738 | |
739 | *length -= l; | |
740 | *ret_ai = ai; | |
968d3d24 | 741 | *p = ((const uint8_t*) *p) + l; |
e963e3ad | 742 | |
968d3d24 | 743 | return 0; |
e963e3ad DB |
744 | } |
745 | ||
5599e866 DB |
746 | static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { |
747 | const RHeader *resp; | |
4f809256 | 748 | sd_resolve_query *q; |
968d3d24 | 749 | int r; |
e963e3ad | 750 | |
3bedba4a | 751 | assert(resolve); |
e963e3ad DB |
752 | |
753 | resp = &packet->rheader; | |
754 | assert(resp); | |
5599e866 | 755 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
756 | assert(length == resp->length); |
757 | ||
758 | if (resp->type == RESPONSE_DIED) { | |
968d3d24 | 759 | resolve->dead = true; |
e963e3ad DB |
760 | return 0; |
761 | } | |
762 | ||
96c76ac4 LP |
763 | assert(resolve->n_outstanding > 0); |
764 | resolve->n_outstanding--; | |
765 | ||
3bedba4a | 766 | q = lookup_query(resolve, resp->id); |
8e50b5a7 | 767 | if (!q) |
e963e3ad DB |
768 | return 0; |
769 | ||
770 | switch (resp->type) { | |
968d3d24 | 771 | |
e963e3ad | 772 | case RESPONSE_ADDRINFO: { |
5599e866 | 773 | const AddrInfoResponse *ai_resp = &packet->addrinfo_response; |
e963e3ad DB |
774 | const void *p; |
775 | size_t l; | |
776 | struct addrinfo *prev = NULL; | |
777 | ||
5599e866 | 778 | assert(length >= sizeof(AddrInfoResponse)); |
e963e3ad DB |
779 | assert(q->type == REQUEST_ADDRINFO); |
780 | ||
781 | q->ret = ai_resp->ret; | |
782 | q->_errno = ai_resp->_errno; | |
783 | q->_h_errno = ai_resp->_h_errno; | |
968d3d24 | 784 | |
5599e866 DB |
785 | l = length - sizeof(AddrInfoResponse); |
786 | p = (const uint8_t*) resp + sizeof(AddrInfoResponse); | |
e963e3ad DB |
787 | |
788 | while (l > 0 && p) { | |
789 | struct addrinfo *ai = NULL; | |
e963e3ad | 790 | |
968d3d24 LP |
791 | r = unserialize_addrinfo(&p, &l, &ai); |
792 | if (r < 0) { | |
793 | q->ret = EAI_SYSTEM; | |
794 | q->_errno = -r; | |
795 | q->_h_errno = 0; | |
796 | freeaddrinfo(q->addrinfo); | |
797 | q->addrinfo = NULL; | |
e963e3ad DB |
798 | break; |
799 | } | |
800 | ||
801 | if (prev) | |
802 | prev->ai_next = ai; | |
803 | else | |
804 | q->addrinfo = ai; | |
805 | ||
806 | prev = ai; | |
807 | } | |
808 | ||
93f1bcf4 | 809 | return complete_query(resolve, q); |
e963e3ad DB |
810 | } |
811 | ||
812 | case RESPONSE_NAMEINFO: { | |
5599e866 | 813 | const NameInfoResponse *ni_resp = &packet->nameinfo_response; |
e963e3ad | 814 | |
5599e866 | 815 | assert(length >= sizeof(NameInfoResponse)); |
e963e3ad DB |
816 | assert(q->type == REQUEST_NAMEINFO); |
817 | ||
818 | q->ret = ni_resp->ret; | |
819 | q->_errno = ni_resp->_errno; | |
820 | q->_h_errno = ni_resp->_h_errno; | |
821 | ||
968d3d24 LP |
822 | if (ni_resp->hostlen > 0) { |
823 | q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); | |
824 | if (!q->host) { | |
e963e3ad | 825 | q->ret = EAI_MEMORY; |
968d3d24 LP |
826 | q->_errno = ENOMEM; |
827 | q->_h_errno = 0; | |
828 | } | |
829 | } | |
e963e3ad | 830 | |
968d3d24 LP |
831 | if (ni_resp->servlen > 0) { |
832 | q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); | |
833 | if (!q->serv) { | |
e963e3ad | 834 | q->ret = EAI_MEMORY; |
968d3d24 LP |
835 | q->_errno = ENOMEM; |
836 | q->_h_errno = 0; | |
837 | } | |
838 | } | |
e963e3ad | 839 | |
93f1bcf4 | 840 | return complete_query(resolve, q); |
e963e3ad DB |
841 | } |
842 | ||
e963e3ad | 843 | default: |
93f1bcf4 | 844 | return 0; |
e963e3ad | 845 | } |
e963e3ad DB |
846 | } |
847 | ||
968d3d24 | 848 | _public_ int sd_resolve_process(sd_resolve *resolve) { |
93f1bcf4 LP |
849 | RESOLVE_DONT_DESTROY(resolve); |
850 | ||
851 | union { | |
852 | Packet packet; | |
853 | uint8_t space[BUFSIZE]; | |
854 | } buf; | |
855 | ssize_t l; | |
856 | int r; | |
968d3d24 LP |
857 | |
858 | assert_return(resolve, -EINVAL); | |
859 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 860 | |
93f1bcf4 LP |
861 | /* We don't allow recursively invoking sd_resolve_process(). */ |
862 | assert_return(!resolve->current, -EBUSY); | |
e963e3ad | 863 | |
93f1bcf4 LP |
864 | l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); |
865 | if (l < 0) { | |
866 | if (errno == EAGAIN) | |
867 | return 0; | |
968d3d24 | 868 | |
93f1bcf4 LP |
869 | return -errno; |
870 | } | |
871 | if (l == 0) | |
872 | return -ECONNREFUSED; | |
e963e3ad | 873 | |
93f1bcf4 LP |
874 | r = handle_response(resolve, &buf.packet, (size_t) l); |
875 | if (r < 0) | |
876 | return r; | |
e963e3ad | 877 | |
93f1bcf4 | 878 | return 1; |
968d3d24 | 879 | } |
e963e3ad | 880 | |
968d3d24 LP |
881 | _public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { |
882 | int r; | |
e963e3ad | 883 | |
968d3d24 LP |
884 | assert_return(resolve, -EINVAL); |
885 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 886 | |
93f1bcf4 | 887 | if (resolve->n_done >= resolve->n_queries) |
968d3d24 | 888 | return 0; |
e963e3ad | 889 | |
968d3d24 LP |
890 | do { |
891 | r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); | |
892 | } while (r == -EINTR); | |
e963e3ad | 893 | |
968d3d24 LP |
894 | if (r < 0) |
895 | return r; | |
e963e3ad | 896 | |
968d3d24 | 897 | return sd_resolve_process(resolve); |
e963e3ad DB |
898 | } |
899 | ||
4a134c49 | 900 | static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { |
4f809256 | 901 | sd_resolve_query *q; |
968d3d24 LP |
902 | int r; |
903 | ||
3bedba4a | 904 | assert(resolve); |
968d3d24 | 905 | assert(_q); |
e963e3ad | 906 | |
968d3d24 LP |
907 | if (resolve->n_queries >= QUERIES_MAX) |
908 | return -ENOBUFS; | |
909 | ||
910 | r = start_threads(resolve, 1); | |
911 | if (r < 0) | |
912 | return r; | |
e963e3ad | 913 | |
85529c81 | 914 | while (resolve->query_array[resolve->current_id % QUERIES_MAX]) |
3bedba4a | 915 | resolve->current_id++; |
e963e3ad | 916 | |
85529c81 | 917 | q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); |
968d3d24 LP |
918 | if (!q) |
919 | return -ENOMEM; | |
e963e3ad | 920 | |
93f1bcf4 | 921 | q->n_ref = 1; |
4a134c49 LP |
922 | q->resolve = resolve; |
923 | q->floating = floating; | |
85529c81 | 924 | q->id = resolve->current_id++; |
968d3d24 | 925 | |
4a134c49 LP |
926 | if (!floating) |
927 | sd_resolve_ref(resolve); | |
928 | ||
929 | LIST_PREPEND(queries, resolve->queries, q); | |
93f1bcf4 LP |
930 | resolve->n_queries++; |
931 | ||
968d3d24 LP |
932 | *_q = q; |
933 | return 0; | |
e963e3ad DB |
934 | } |
935 | ||
968d3d24 LP |
936 | _public_ int sd_resolve_getaddrinfo( |
937 | sd_resolve *resolve, | |
151b9b96 | 938 | sd_resolve_query **_q, |
93f1bcf4 LP |
939 | const char *node, const char *service, |
940 | const struct addrinfo *hints, | |
941 | sd_resolve_getaddrinfo_handler_t callback, void *userdata) { | |
968d3d24 LP |
942 | |
943 | AddrInfoRequest req = {}; | |
944 | struct msghdr mh = {}; | |
945 | struct iovec iov[3]; | |
4f809256 | 946 | sd_resolve_query *q; |
968d3d24 | 947 | int r; |
e963e3ad | 948 | |
968d3d24 | 949 | assert_return(resolve, -EINVAL); |
93f1bcf4 LP |
950 | assert_return(node || service, -EINVAL); |
951 | assert_return(callback, -EINVAL); | |
968d3d24 | 952 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 953 | |
4a134c49 | 954 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
955 | if (r < 0) |
956 | return r; | |
e963e3ad | 957 | |
93f1bcf4 LP |
958 | q->type = REQUEST_ADDRINFO; |
959 | q->getaddrinfo_handler = callback; | |
960 | q->userdata = userdata; | |
961 | ||
968d3d24 LP |
962 | req.node_len = node ? strlen(node)+1 : 0; |
963 | req.service_len = service ? strlen(service)+1 : 0; | |
e963e3ad | 964 | |
968d3d24 | 965 | req.header.id = q->id; |
93f1bcf4 | 966 | req.header.type = REQUEST_ADDRINFO; |
968d3d24 | 967 | req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; |
e963e3ad | 968 | |
968d3d24 LP |
969 | if (hints) { |
970 | req.hints_valid = true; | |
971 | req.ai_flags = hints->ai_flags; | |
972 | req.ai_family = hints->ai_family; | |
973 | req.ai_socktype = hints->ai_socktype; | |
974 | req.ai_protocol = hints->ai_protocol; | |
e963e3ad DB |
975 | } |
976 | ||
968d3d24 | 977 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; |
e963e3ad | 978 | if (node) |
968d3d24 | 979 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; |
e963e3ad | 980 | if (service) |
968d3d24 | 981 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; |
968d3d24 | 982 | mh.msg_iov = iov; |
e963e3ad | 983 | |
968d3d24 | 984 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 985 | sd_resolve_query_unref(q); |
968d3d24 LP |
986 | return -errno; |
987 | } | |
e963e3ad | 988 | |
96c76ac4 LP |
989 | resolve->n_outstanding++; |
990 | ||
4a134c49 LP |
991 | if (_q) |
992 | *_q = q; | |
993 | ||
968d3d24 | 994 | return 0; |
e963e3ad DB |
995 | } |
996 | ||
93f1bcf4 LP |
997 | static int getaddrinfo_done(sd_resolve_query* q) { |
998 | assert(q); | |
999 | assert(q->done); | |
1000 | assert(q->getaddrinfo_handler); | |
e963e3ad | 1001 | |
93f1bcf4 LP |
1002 | errno = q->_errno; |
1003 | h_errno = q->_h_errno; | |
e963e3ad | 1004 | |
93f1bcf4 | 1005 | return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); |
e963e3ad DB |
1006 | } |
1007 | ||
968d3d24 LP |
1008 | _public_ int sd_resolve_getnameinfo( |
1009 | sd_resolve *resolve, | |
151b9b96 | 1010 | sd_resolve_query**_q, |
968d3d24 LP |
1011 | const struct sockaddr *sa, socklen_t salen, |
1012 | int flags, | |
93f1bcf4 LP |
1013 | uint64_t get, |
1014 | sd_resolve_getnameinfo_handler_t callback, | |
1015 | void *userdata) { | |
e963e3ad | 1016 | |
968d3d24 LP |
1017 | NameInfoRequest req = {}; |
1018 | struct msghdr mh = {}; | |
1019 | struct iovec iov[2]; | |
1020 | sd_resolve_query *q; | |
1021 | int r; | |
e963e3ad | 1022 | |
968d3d24 LP |
1023 | assert_return(resolve, -EINVAL); |
1024 | assert_return(sa, -EINVAL); | |
1025 | assert_return(salen >= sizeof(struct sockaddr), -EINVAL); | |
1026 | assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); | |
93f1bcf4 LP |
1027 | assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); |
1028 | assert_return(callback, -EINVAL); | |
968d3d24 | 1029 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 1030 | |
4a134c49 | 1031 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
1032 | if (r < 0) |
1033 | return r; | |
e963e3ad | 1034 | |
93f1bcf4 LP |
1035 | q->type = REQUEST_NAMEINFO; |
1036 | q->getnameinfo_handler = callback; | |
1037 | q->userdata = userdata; | |
1038 | ||
968d3d24 | 1039 | req.header.id = q->id; |
93f1bcf4 | 1040 | req.header.type = REQUEST_NAMEINFO; |
968d3d24 | 1041 | req.header.length = sizeof(NameInfoRequest) + salen; |
e963e3ad | 1042 | |
968d3d24 LP |
1043 | req.flags = flags; |
1044 | req.sockaddr_len = salen; | |
93f1bcf4 LP |
1045 | req.gethost = !!(get & SD_RESOLVE_GET_HOST); |
1046 | req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); | |
e963e3ad | 1047 | |
968d3d24 LP |
1048 | iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; |
1049 | iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; | |
e963e3ad | 1050 | |
968d3d24 LP |
1051 | mh.msg_iov = iov; |
1052 | mh.msg_iovlen = 2; | |
e963e3ad | 1053 | |
968d3d24 | 1054 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 1055 | sd_resolve_query_unref(q); |
968d3d24 LP |
1056 | return -errno; |
1057 | } | |
e963e3ad | 1058 | |
96c76ac4 LP |
1059 | resolve->n_outstanding++; |
1060 | ||
4a134c49 LP |
1061 | if (_q) |
1062 | *_q = q; | |
1063 | ||
968d3d24 | 1064 | return 0; |
e963e3ad DB |
1065 | } |
1066 | ||
93f1bcf4 | 1067 | static int getnameinfo_done(sd_resolve_query *q) { |
968d3d24 | 1068 | |
93f1bcf4 LP |
1069 | assert(q); |
1070 | assert(q->done); | |
1071 | assert(q->getnameinfo_handler); | |
e963e3ad | 1072 | |
93f1bcf4 LP |
1073 | errno = q->_errno; |
1074 | h_errno= q->_h_errno; | |
e963e3ad | 1075 | |
93f1bcf4 | 1076 | return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); |
e963e3ad DB |
1077 | } |
1078 | ||
93f1bcf4 LP |
1079 | _public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { |
1080 | assert_return(q, NULL); | |
e963e3ad | 1081 | |
93f1bcf4 LP |
1082 | assert(q->n_ref >= 1); |
1083 | q->n_ref++; | |
968d3d24 | 1084 | |
93f1bcf4 | 1085 | return q; |
e963e3ad DB |
1086 | } |
1087 | ||
93f1bcf4 LP |
1088 | static void resolve_freeaddrinfo(struct addrinfo *ai) { |
1089 | while (ai) { | |
1090 | struct addrinfo *next = ai->ai_next; | |
e963e3ad | 1091 | |
93f1bcf4 LP |
1092 | free(ai->ai_addr); |
1093 | free(ai->ai_canonname); | |
1094 | free(ai); | |
1095 | ai = next; | |
1096 | } | |
1097 | } | |
e963e3ad | 1098 | |
4a134c49 LP |
1099 | static void resolve_query_disconnect(sd_resolve_query *q) { |
1100 | sd_resolve *resolve; | |
93f1bcf4 | 1101 | unsigned i; |
e963e3ad | 1102 | |
93f1bcf4 | 1103 | assert(q); |
4a134c49 LP |
1104 | |
1105 | if (!q->resolve) | |
1106 | return; | |
1107 | ||
1108 | resolve = q->resolve; | |
1109 | assert(resolve->n_queries > 0); | |
e963e3ad | 1110 | |
968d3d24 | 1111 | if (q->done) { |
4a134c49 LP |
1112 | assert(resolve->n_done > 0); |
1113 | resolve->n_done--; | |
e963e3ad DB |
1114 | } |
1115 | ||
968d3d24 | 1116 | i = q->id % QUERIES_MAX; |
4a134c49 LP |
1117 | assert(resolve->query_array[i] == q); |
1118 | resolve->query_array[i] = NULL; | |
1119 | LIST_REMOVE(queries, resolve->queries, q); | |
1120 | resolve->n_queries--; | |
1121 | ||
1122 | q->resolve = NULL; | |
1123 | if (!q->floating) | |
1124 | sd_resolve_unref(resolve); | |
1125 | } | |
1126 | ||
1127 | static void resolve_query_free(sd_resolve_query *q) { | |
1128 | assert(q); | |
1129 | ||
1130 | resolve_query_disconnect(q); | |
e963e3ad | 1131 | |
93f1bcf4 | 1132 | resolve_freeaddrinfo(q->addrinfo); |
e963e3ad DB |
1133 | free(q->host); |
1134 | free(q->serv); | |
e963e3ad | 1135 | free(q); |
e963e3ad DB |
1136 | } |
1137 | ||
93f1bcf4 LP |
1138 | _public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { |
1139 | if (!q) | |
1140 | return NULL; | |
e963e3ad | 1141 | |
93f1bcf4 LP |
1142 | assert(q->n_ref >= 1); |
1143 | q->n_ref--; | |
e963e3ad | 1144 | |
93f1bcf4 LP |
1145 | if (q->n_ref <= 0) |
1146 | resolve_query_free(q); | |
e963e3ad | 1147 | |
93f1bcf4 | 1148 | return NULL; |
e963e3ad DB |
1149 | } |
1150 | ||
93f1bcf4 | 1151 | _public_ int sd_resolve_query_is_done(sd_resolve_query *q) { |
968d3d24 LP |
1152 | assert_return(q, -EINVAL); |
1153 | assert_return(!resolve_pid_changed(q->resolve), -ECHILD); | |
e963e3ad DB |
1154 | |
1155 | return q->done; | |
1156 | } | |
1157 | ||
93f1bcf4 | 1158 | _public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { |
968d3d24 | 1159 | void *ret; |
e963e3ad | 1160 | |
968d3d24 LP |
1161 | assert_return(q, NULL); |
1162 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1163 | ||
1164 | ret = q->userdata; | |
e963e3ad | 1165 | q->userdata = userdata; |
968d3d24 LP |
1166 | |
1167 | return ret; | |
e963e3ad DB |
1168 | } |
1169 | ||
93f1bcf4 | 1170 | _public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { |
968d3d24 LP |
1171 | assert_return(q, NULL); |
1172 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
e963e3ad DB |
1173 | |
1174 | return q->userdata; | |
1175 | } | |
93f1bcf4 LP |
1176 | |
1177 | _public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { | |
1178 | assert_return(q, NULL); | |
1179 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1180 | ||
1181 | return q->resolve; | |
1182 | } | |
1183 | ||
1184 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1185 | sd_resolve *resolve = userdata; | |
1186 | int r; | |
1187 | ||
1188 | assert(resolve); | |
1189 | ||
1190 | r = sd_resolve_process(resolve); | |
1191 | if (r < 0) | |
1192 | return r; | |
1193 | ||
1194 | return 1; | |
1195 | } | |
1196 | ||
1197 | _public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int priority) { | |
1198 | int r; | |
1199 | ||
1200 | assert_return(resolve, -EINVAL); | |
1201 | assert_return(!resolve->event, -EBUSY); | |
1202 | ||
1203 | assert(!resolve->event_source); | |
1204 | ||
1205 | if (event) | |
1206 | resolve->event = sd_event_ref(event); | |
1207 | else { | |
1208 | r = sd_event_default(&resolve->event); | |
1209 | if (r < 0) | |
1210 | return r; | |
1211 | } | |
1212 | ||
1213 | r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); | |
1214 | if (r < 0) | |
1215 | goto fail; | |
1216 | ||
1217 | r = sd_event_source_set_priority(resolve->event_source, priority); | |
1218 | if (r < 0) | |
1219 | goto fail; | |
1220 | ||
1221 | return 0; | |
1222 | ||
1223 | fail: | |
1224 | sd_resolve_detach_event(resolve); | |
1225 | return r; | |
1226 | } | |
1227 | ||
1228 | _public_ int sd_resolve_detach_event(sd_resolve *resolve) { | |
1229 | assert_return(resolve, -EINVAL); | |
1230 | ||
1231 | if (!resolve->event) | |
1232 | return 0; | |
1233 | ||
1234 | if (resolve->event_source) { | |
1235 | sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); | |
1236 | resolve->event_source = sd_event_source_unref(resolve->event_source); | |
1237 | } | |
1238 | ||
1239 | resolve->event = sd_event_unref(resolve->event); | |
1240 | return 1; | |
1241 | } | |
1242 | ||
1243 | _public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { | |
1244 | assert_return(resolve, NULL); | |
1245 | ||
1246 | return resolve->event; | |
1247 | } |