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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 | |
3ffd4af2 | 36 | #include "fd-util.h" |
c004493c | 37 | #include "io-util.h" |
968d3d24 | 38 | #include "list.h" |
93f1bcf4 LP |
39 | #include "missing.h" |
40 | #include "resolve-util.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 LP |
180 | #define RESOLVE_DONT_DESTROY(resolve) \ |
181 | _cleanup_resolve_unref_ _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) | |
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. */ | |
968d3d24 | 586 | for (i = 0; i < resolve->n_valid_workers; i++) { |
e963e3ad | 587 | for (;;) { |
968d3d24 | 588 | if (pthread_join(resolve->workers[i], NULL) != EINTR) |
e963e3ad DB |
589 | break; |
590 | } | |
591 | } | |
592 | ||
593 | /* Close all communication channels */ | |
968d3d24 | 594 | for (i = 0; i < _FD_MAX; i++) |
03e334a1 | 595 | safe_close(resolve->fds[i]); |
e963e3ad | 596 | |
3bedba4a | 597 | free(resolve); |
93f1bcf4 LP |
598 | } |
599 | ||
600 | _public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { | |
601 | assert_return(resolve, NULL); | |
602 | ||
603 | assert(resolve->n_ref >= 1); | |
604 | resolve->n_ref++; | |
605 | ||
606 | return resolve; | |
607 | } | |
608 | ||
609 | _public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { | |
610 | ||
611 | if (!resolve) | |
612 | return NULL; | |
613 | ||
614 | assert(resolve->n_ref >= 1); | |
615 | resolve->n_ref--; | |
616 | ||
617 | if (resolve->n_ref <= 0) | |
618 | resolve_free(resolve); | |
619 | ||
968d3d24 | 620 | return NULL; |
e963e3ad DB |
621 | } |
622 | ||
968d3d24 LP |
623 | _public_ int sd_resolve_get_fd(sd_resolve *resolve) { |
624 | assert_return(resolve, -EINVAL); | |
625 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 626 | |
3bedba4a | 627 | return resolve->fds[RESPONSE_RECV_FD]; |
e963e3ad DB |
628 | } |
629 | ||
968d3d24 LP |
630 | _public_ int sd_resolve_get_events(sd_resolve *resolve) { |
631 | assert_return(resolve, -EINVAL); | |
632 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
633 | ||
634 | return resolve->n_queries > resolve->n_done ? POLLIN : 0; | |
635 | } | |
636 | ||
637 | _public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { | |
638 | assert_return(resolve, -EINVAL); | |
639 | assert_return(usec, -EINVAL); | |
640 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
641 | ||
642 | *usec = (uint64_t) -1; | |
643 | return 0; | |
644 | } | |
645 | ||
4f809256 DB |
646 | static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { |
647 | sd_resolve_query *q; | |
968d3d24 | 648 | |
3bedba4a | 649 | assert(resolve); |
e963e3ad | 650 | |
4a134c49 | 651 | q = resolve->query_array[id % QUERIES_MAX]; |
8e50b5a7 | 652 | if (q) |
e963e3ad DB |
653 | if (q->id == id) |
654 | return q; | |
655 | ||
656 | return NULL; | |
657 | } | |
658 | ||
93f1bcf4 LP |
659 | static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { |
660 | int r; | |
661 | ||
e963e3ad DB |
662 | assert(q); |
663 | assert(!q->done); | |
93f1bcf4 | 664 | assert(q->resolve == resolve); |
e963e3ad | 665 | |
968d3d24 | 666 | q->done = true; |
93f1bcf4 LP |
667 | resolve->n_done ++; |
668 | ||
73dec319 | 669 | resolve->current = sd_resolve_query_ref(q); |
93f1bcf4 LP |
670 | |
671 | switch (q->type) { | |
672 | ||
673 | case REQUEST_ADDRINFO: | |
674 | r = getaddrinfo_done(q); | |
675 | break; | |
676 | ||
677 | case REQUEST_NAMEINFO: | |
678 | r = getnameinfo_done(q); | |
679 | break; | |
680 | ||
93f1bcf4 LP |
681 | default: |
682 | assert_not_reached("Cannot complete unknown query type"); | |
683 | } | |
684 | ||
502fe44e | 685 | resolve->current = NULL; |
93f1bcf4 | 686 | |
4a134c49 LP |
687 | if (q->floating) { |
688 | resolve_query_disconnect(q); | |
f2e2415d | 689 | sd_resolve_query_unref(q); |
4a134c49 LP |
690 | } |
691 | ||
502fe44e LP |
692 | sd_resolve_query_unref(q); |
693 | ||
93f1bcf4 | 694 | return r; |
e963e3ad DB |
695 | } |
696 | ||
968d3d24 | 697 | static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { |
5599e866 | 698 | AddrInfoSerialization s; |
e963e3ad DB |
699 | size_t l; |
700 | struct addrinfo *ai; | |
968d3d24 | 701 | |
e963e3ad | 702 | assert(p); |
968d3d24 | 703 | assert(*p); |
e963e3ad DB |
704 | assert(ret_ai); |
705 | assert(length); | |
706 | ||
5599e866 | 707 | if (*length < sizeof(AddrInfoSerialization)) |
968d3d24 | 708 | return -EBADMSG; |
e963e3ad | 709 | |
968d3d24 | 710 | memcpy(&s, *p, sizeof(s)); |
e963e3ad | 711 | |
5599e866 | 712 | l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; |
e963e3ad | 713 | if (*length < l) |
968d3d24 | 714 | return -EBADMSG; |
e963e3ad | 715 | |
968d3d24 | 716 | ai = new0(struct addrinfo, 1); |
8e50b5a7 | 717 | if (!ai) |
968d3d24 | 718 | return -ENOMEM; |
e963e3ad DB |
719 | |
720 | ai->ai_flags = s.ai_flags; | |
721 | ai->ai_family = s.ai_family; | |
722 | ai->ai_socktype = s.ai_socktype; | |
723 | ai->ai_protocol = s.ai_protocol; | |
724 | ai->ai_addrlen = s.ai_addrlen; | |
725 | ||
968d3d24 LP |
726 | if (s.ai_addrlen > 0) { |
727 | ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); | |
728 | if (!ai->ai_addr) { | |
729 | free(ai); | |
730 | return -ENOMEM; | |
731 | } | |
732 | } | |
e963e3ad | 733 | |
968d3d24 LP |
734 | if (s.canonname_len > 0) { |
735 | ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); | |
736 | if (!ai->ai_canonname) { | |
737 | free(ai->ai_addr); | |
738 | free(ai); | |
739 | return -ENOMEM; | |
740 | } | |
741 | } | |
e963e3ad DB |
742 | |
743 | *length -= l; | |
744 | *ret_ai = ai; | |
968d3d24 | 745 | *p = ((const uint8_t*) *p) + l; |
e963e3ad | 746 | |
968d3d24 | 747 | return 0; |
e963e3ad DB |
748 | } |
749 | ||
5599e866 DB |
750 | static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { |
751 | const RHeader *resp; | |
4f809256 | 752 | sd_resolve_query *q; |
968d3d24 | 753 | int r; |
e963e3ad | 754 | |
3bedba4a | 755 | assert(resolve); |
e963e3ad DB |
756 | |
757 | resp = &packet->rheader; | |
758 | assert(resp); | |
5599e866 | 759 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
760 | assert(length == resp->length); |
761 | ||
762 | if (resp->type == RESPONSE_DIED) { | |
968d3d24 | 763 | resolve->dead = true; |
e963e3ad DB |
764 | return 0; |
765 | } | |
766 | ||
96c76ac4 LP |
767 | assert(resolve->n_outstanding > 0); |
768 | resolve->n_outstanding--; | |
769 | ||
3bedba4a | 770 | q = lookup_query(resolve, resp->id); |
8e50b5a7 | 771 | if (!q) |
e963e3ad DB |
772 | return 0; |
773 | ||
774 | switch (resp->type) { | |
968d3d24 | 775 | |
e963e3ad | 776 | case RESPONSE_ADDRINFO: { |
5599e866 | 777 | const AddrInfoResponse *ai_resp = &packet->addrinfo_response; |
e963e3ad DB |
778 | const void *p; |
779 | size_t l; | |
780 | struct addrinfo *prev = NULL; | |
781 | ||
5599e866 | 782 | assert(length >= sizeof(AddrInfoResponse)); |
e963e3ad DB |
783 | assert(q->type == REQUEST_ADDRINFO); |
784 | ||
785 | q->ret = ai_resp->ret; | |
786 | q->_errno = ai_resp->_errno; | |
787 | q->_h_errno = ai_resp->_h_errno; | |
968d3d24 | 788 | |
5599e866 DB |
789 | l = length - sizeof(AddrInfoResponse); |
790 | p = (const uint8_t*) resp + sizeof(AddrInfoResponse); | |
e963e3ad DB |
791 | |
792 | while (l > 0 && p) { | |
793 | struct addrinfo *ai = NULL; | |
e963e3ad | 794 | |
968d3d24 LP |
795 | r = unserialize_addrinfo(&p, &l, &ai); |
796 | if (r < 0) { | |
797 | q->ret = EAI_SYSTEM; | |
798 | q->_errno = -r; | |
799 | q->_h_errno = 0; | |
800 | freeaddrinfo(q->addrinfo); | |
801 | q->addrinfo = NULL; | |
e963e3ad DB |
802 | break; |
803 | } | |
804 | ||
805 | if (prev) | |
806 | prev->ai_next = ai; | |
807 | else | |
808 | q->addrinfo = ai; | |
809 | ||
810 | prev = ai; | |
811 | } | |
812 | ||
93f1bcf4 | 813 | return complete_query(resolve, q); |
e963e3ad DB |
814 | } |
815 | ||
816 | case RESPONSE_NAMEINFO: { | |
5599e866 | 817 | const NameInfoResponse *ni_resp = &packet->nameinfo_response; |
e963e3ad | 818 | |
5599e866 | 819 | assert(length >= sizeof(NameInfoResponse)); |
e963e3ad DB |
820 | assert(q->type == REQUEST_NAMEINFO); |
821 | ||
822 | q->ret = ni_resp->ret; | |
823 | q->_errno = ni_resp->_errno; | |
824 | q->_h_errno = ni_resp->_h_errno; | |
825 | ||
968d3d24 LP |
826 | if (ni_resp->hostlen > 0) { |
827 | q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); | |
828 | if (!q->host) { | |
e963e3ad | 829 | q->ret = EAI_MEMORY; |
968d3d24 LP |
830 | q->_errno = ENOMEM; |
831 | q->_h_errno = 0; | |
832 | } | |
833 | } | |
e963e3ad | 834 | |
968d3d24 LP |
835 | if (ni_resp->servlen > 0) { |
836 | q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); | |
837 | if (!q->serv) { | |
e963e3ad | 838 | q->ret = EAI_MEMORY; |
968d3d24 LP |
839 | q->_errno = ENOMEM; |
840 | q->_h_errno = 0; | |
841 | } | |
842 | } | |
e963e3ad | 843 | |
93f1bcf4 | 844 | return complete_query(resolve, q); |
e963e3ad DB |
845 | } |
846 | ||
e963e3ad | 847 | default: |
93f1bcf4 | 848 | return 0; |
e963e3ad | 849 | } |
e963e3ad DB |
850 | } |
851 | ||
968d3d24 | 852 | _public_ int sd_resolve_process(sd_resolve *resolve) { |
93f1bcf4 LP |
853 | RESOLVE_DONT_DESTROY(resolve); |
854 | ||
855 | union { | |
856 | Packet packet; | |
857 | uint8_t space[BUFSIZE]; | |
858 | } buf; | |
859 | ssize_t l; | |
860 | int r; | |
968d3d24 LP |
861 | |
862 | assert_return(resolve, -EINVAL); | |
863 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 864 | |
93f1bcf4 LP |
865 | /* We don't allow recursively invoking sd_resolve_process(). */ |
866 | assert_return(!resolve->current, -EBUSY); | |
e963e3ad | 867 | |
93f1bcf4 LP |
868 | l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); |
869 | if (l < 0) { | |
870 | if (errno == EAGAIN) | |
871 | return 0; | |
968d3d24 | 872 | |
93f1bcf4 LP |
873 | return -errno; |
874 | } | |
875 | if (l == 0) | |
876 | return -ECONNREFUSED; | |
e963e3ad | 877 | |
93f1bcf4 LP |
878 | r = handle_response(resolve, &buf.packet, (size_t) l); |
879 | if (r < 0) | |
880 | return r; | |
e963e3ad | 881 | |
93f1bcf4 | 882 | return 1; |
968d3d24 | 883 | } |
e963e3ad | 884 | |
968d3d24 LP |
885 | _public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { |
886 | int r; | |
e963e3ad | 887 | |
968d3d24 LP |
888 | assert_return(resolve, -EINVAL); |
889 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 890 | |
93f1bcf4 | 891 | if (resolve->n_done >= resolve->n_queries) |
968d3d24 | 892 | return 0; |
e963e3ad | 893 | |
968d3d24 LP |
894 | do { |
895 | r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); | |
896 | } while (r == -EINTR); | |
e963e3ad | 897 | |
968d3d24 LP |
898 | if (r < 0) |
899 | return r; | |
e963e3ad | 900 | |
968d3d24 | 901 | return sd_resolve_process(resolve); |
e963e3ad DB |
902 | } |
903 | ||
4a134c49 | 904 | static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { |
4f809256 | 905 | sd_resolve_query *q; |
968d3d24 LP |
906 | int r; |
907 | ||
3bedba4a | 908 | assert(resolve); |
968d3d24 | 909 | assert(_q); |
e963e3ad | 910 | |
968d3d24 LP |
911 | if (resolve->n_queries >= QUERIES_MAX) |
912 | return -ENOBUFS; | |
913 | ||
914 | r = start_threads(resolve, 1); | |
915 | if (r < 0) | |
916 | return r; | |
e963e3ad | 917 | |
85529c81 | 918 | while (resolve->query_array[resolve->current_id % QUERIES_MAX]) |
3bedba4a | 919 | resolve->current_id++; |
e963e3ad | 920 | |
85529c81 | 921 | q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); |
968d3d24 LP |
922 | if (!q) |
923 | return -ENOMEM; | |
e963e3ad | 924 | |
93f1bcf4 | 925 | q->n_ref = 1; |
4a134c49 LP |
926 | q->resolve = resolve; |
927 | q->floating = floating; | |
85529c81 | 928 | q->id = resolve->current_id++; |
968d3d24 | 929 | |
4a134c49 LP |
930 | if (!floating) |
931 | sd_resolve_ref(resolve); | |
932 | ||
933 | LIST_PREPEND(queries, resolve->queries, q); | |
93f1bcf4 LP |
934 | resolve->n_queries++; |
935 | ||
968d3d24 LP |
936 | *_q = q; |
937 | return 0; | |
e963e3ad DB |
938 | } |
939 | ||
968d3d24 LP |
940 | _public_ int sd_resolve_getaddrinfo( |
941 | sd_resolve *resolve, | |
151b9b96 | 942 | sd_resolve_query **_q, |
93f1bcf4 LP |
943 | const char *node, const char *service, |
944 | const struct addrinfo *hints, | |
945 | sd_resolve_getaddrinfo_handler_t callback, void *userdata) { | |
968d3d24 LP |
946 | |
947 | AddrInfoRequest req = {}; | |
948 | struct msghdr mh = {}; | |
949 | struct iovec iov[3]; | |
4f809256 | 950 | sd_resolve_query *q; |
968d3d24 | 951 | int r; |
e963e3ad | 952 | |
968d3d24 | 953 | assert_return(resolve, -EINVAL); |
93f1bcf4 LP |
954 | assert_return(node || service, -EINVAL); |
955 | assert_return(callback, -EINVAL); | |
968d3d24 | 956 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 957 | |
4a134c49 | 958 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
959 | if (r < 0) |
960 | return r; | |
e963e3ad | 961 | |
93f1bcf4 LP |
962 | q->type = REQUEST_ADDRINFO; |
963 | q->getaddrinfo_handler = callback; | |
964 | q->userdata = userdata; | |
965 | ||
968d3d24 LP |
966 | req.node_len = node ? strlen(node)+1 : 0; |
967 | req.service_len = service ? strlen(service)+1 : 0; | |
e963e3ad | 968 | |
968d3d24 | 969 | req.header.id = q->id; |
93f1bcf4 | 970 | req.header.type = REQUEST_ADDRINFO; |
968d3d24 | 971 | req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; |
e963e3ad | 972 | |
968d3d24 LP |
973 | if (hints) { |
974 | req.hints_valid = true; | |
975 | req.ai_flags = hints->ai_flags; | |
976 | req.ai_family = hints->ai_family; | |
977 | req.ai_socktype = hints->ai_socktype; | |
978 | req.ai_protocol = hints->ai_protocol; | |
e963e3ad DB |
979 | } |
980 | ||
968d3d24 | 981 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; |
e963e3ad | 982 | if (node) |
968d3d24 | 983 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; |
e963e3ad | 984 | if (service) |
968d3d24 | 985 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; |
968d3d24 | 986 | mh.msg_iov = iov; |
e963e3ad | 987 | |
968d3d24 | 988 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 989 | sd_resolve_query_unref(q); |
968d3d24 LP |
990 | return -errno; |
991 | } | |
e963e3ad | 992 | |
96c76ac4 LP |
993 | resolve->n_outstanding++; |
994 | ||
4a134c49 LP |
995 | if (_q) |
996 | *_q = q; | |
997 | ||
968d3d24 | 998 | return 0; |
e963e3ad DB |
999 | } |
1000 | ||
93f1bcf4 LP |
1001 | static int getaddrinfo_done(sd_resolve_query* q) { |
1002 | assert(q); | |
1003 | assert(q->done); | |
1004 | assert(q->getaddrinfo_handler); | |
e963e3ad | 1005 | |
93f1bcf4 LP |
1006 | errno = q->_errno; |
1007 | h_errno = q->_h_errno; | |
e963e3ad | 1008 | |
93f1bcf4 | 1009 | return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); |
e963e3ad DB |
1010 | } |
1011 | ||
968d3d24 LP |
1012 | _public_ int sd_resolve_getnameinfo( |
1013 | sd_resolve *resolve, | |
151b9b96 | 1014 | sd_resolve_query**_q, |
968d3d24 LP |
1015 | const struct sockaddr *sa, socklen_t salen, |
1016 | int flags, | |
93f1bcf4 LP |
1017 | uint64_t get, |
1018 | sd_resolve_getnameinfo_handler_t callback, | |
1019 | void *userdata) { | |
e963e3ad | 1020 | |
968d3d24 LP |
1021 | NameInfoRequest req = {}; |
1022 | struct msghdr mh = {}; | |
1023 | struct iovec iov[2]; | |
1024 | sd_resolve_query *q; | |
1025 | int r; | |
e963e3ad | 1026 | |
968d3d24 LP |
1027 | assert_return(resolve, -EINVAL); |
1028 | assert_return(sa, -EINVAL); | |
1029 | assert_return(salen >= sizeof(struct sockaddr), -EINVAL); | |
1030 | assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); | |
93f1bcf4 LP |
1031 | assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); |
1032 | assert_return(callback, -EINVAL); | |
968d3d24 | 1033 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 1034 | |
4a134c49 | 1035 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
1036 | if (r < 0) |
1037 | return r; | |
e963e3ad | 1038 | |
93f1bcf4 LP |
1039 | q->type = REQUEST_NAMEINFO; |
1040 | q->getnameinfo_handler = callback; | |
1041 | q->userdata = userdata; | |
1042 | ||
968d3d24 | 1043 | req.header.id = q->id; |
93f1bcf4 | 1044 | req.header.type = REQUEST_NAMEINFO; |
968d3d24 | 1045 | req.header.length = sizeof(NameInfoRequest) + salen; |
e963e3ad | 1046 | |
968d3d24 LP |
1047 | req.flags = flags; |
1048 | req.sockaddr_len = salen; | |
93f1bcf4 LP |
1049 | req.gethost = !!(get & SD_RESOLVE_GET_HOST); |
1050 | req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); | |
e963e3ad | 1051 | |
968d3d24 LP |
1052 | iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; |
1053 | iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; | |
e963e3ad | 1054 | |
968d3d24 LP |
1055 | mh.msg_iov = iov; |
1056 | mh.msg_iovlen = 2; | |
e963e3ad | 1057 | |
968d3d24 | 1058 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 1059 | sd_resolve_query_unref(q); |
968d3d24 LP |
1060 | return -errno; |
1061 | } | |
e963e3ad | 1062 | |
96c76ac4 LP |
1063 | resolve->n_outstanding++; |
1064 | ||
4a134c49 LP |
1065 | if (_q) |
1066 | *_q = q; | |
1067 | ||
968d3d24 | 1068 | return 0; |
e963e3ad DB |
1069 | } |
1070 | ||
93f1bcf4 | 1071 | static int getnameinfo_done(sd_resolve_query *q) { |
968d3d24 | 1072 | |
93f1bcf4 LP |
1073 | assert(q); |
1074 | assert(q->done); | |
1075 | assert(q->getnameinfo_handler); | |
e963e3ad | 1076 | |
93f1bcf4 LP |
1077 | errno = q->_errno; |
1078 | h_errno= q->_h_errno; | |
e963e3ad | 1079 | |
93f1bcf4 | 1080 | return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); |
e963e3ad DB |
1081 | } |
1082 | ||
93f1bcf4 LP |
1083 | _public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { |
1084 | assert_return(q, NULL); | |
e963e3ad | 1085 | |
93f1bcf4 LP |
1086 | assert(q->n_ref >= 1); |
1087 | q->n_ref++; | |
968d3d24 | 1088 | |
93f1bcf4 | 1089 | return q; |
e963e3ad DB |
1090 | } |
1091 | ||
93f1bcf4 LP |
1092 | static void resolve_freeaddrinfo(struct addrinfo *ai) { |
1093 | while (ai) { | |
1094 | struct addrinfo *next = ai->ai_next; | |
e963e3ad | 1095 | |
93f1bcf4 LP |
1096 | free(ai->ai_addr); |
1097 | free(ai->ai_canonname); | |
1098 | free(ai); | |
1099 | ai = next; | |
1100 | } | |
1101 | } | |
e963e3ad | 1102 | |
4a134c49 LP |
1103 | static void resolve_query_disconnect(sd_resolve_query *q) { |
1104 | sd_resolve *resolve; | |
93f1bcf4 | 1105 | unsigned i; |
e963e3ad | 1106 | |
93f1bcf4 | 1107 | assert(q); |
4a134c49 LP |
1108 | |
1109 | if (!q->resolve) | |
1110 | return; | |
1111 | ||
1112 | resolve = q->resolve; | |
1113 | assert(resolve->n_queries > 0); | |
e963e3ad | 1114 | |
968d3d24 | 1115 | if (q->done) { |
4a134c49 LP |
1116 | assert(resolve->n_done > 0); |
1117 | resolve->n_done--; | |
e963e3ad DB |
1118 | } |
1119 | ||
968d3d24 | 1120 | i = q->id % QUERIES_MAX; |
4a134c49 LP |
1121 | assert(resolve->query_array[i] == q); |
1122 | resolve->query_array[i] = NULL; | |
1123 | LIST_REMOVE(queries, resolve->queries, q); | |
1124 | resolve->n_queries--; | |
1125 | ||
1126 | q->resolve = NULL; | |
1127 | if (!q->floating) | |
1128 | sd_resolve_unref(resolve); | |
1129 | } | |
1130 | ||
1131 | static void resolve_query_free(sd_resolve_query *q) { | |
1132 | assert(q); | |
1133 | ||
1134 | resolve_query_disconnect(q); | |
e963e3ad | 1135 | |
93f1bcf4 | 1136 | resolve_freeaddrinfo(q->addrinfo); |
e963e3ad DB |
1137 | free(q->host); |
1138 | free(q->serv); | |
e963e3ad | 1139 | free(q); |
e963e3ad DB |
1140 | } |
1141 | ||
93f1bcf4 LP |
1142 | _public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { |
1143 | if (!q) | |
1144 | return NULL; | |
e963e3ad | 1145 | |
93f1bcf4 LP |
1146 | assert(q->n_ref >= 1); |
1147 | q->n_ref--; | |
e963e3ad | 1148 | |
93f1bcf4 LP |
1149 | if (q->n_ref <= 0) |
1150 | resolve_query_free(q); | |
e963e3ad | 1151 | |
93f1bcf4 | 1152 | return NULL; |
e963e3ad DB |
1153 | } |
1154 | ||
93f1bcf4 | 1155 | _public_ int sd_resolve_query_is_done(sd_resolve_query *q) { |
968d3d24 LP |
1156 | assert_return(q, -EINVAL); |
1157 | assert_return(!resolve_pid_changed(q->resolve), -ECHILD); | |
e963e3ad DB |
1158 | |
1159 | return q->done; | |
1160 | } | |
1161 | ||
93f1bcf4 | 1162 | _public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { |
968d3d24 | 1163 | void *ret; |
e963e3ad | 1164 | |
968d3d24 LP |
1165 | assert_return(q, NULL); |
1166 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1167 | ||
1168 | ret = q->userdata; | |
e963e3ad | 1169 | q->userdata = userdata; |
968d3d24 LP |
1170 | |
1171 | return ret; | |
e963e3ad DB |
1172 | } |
1173 | ||
93f1bcf4 | 1174 | _public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { |
968d3d24 LP |
1175 | assert_return(q, NULL); |
1176 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
e963e3ad DB |
1177 | |
1178 | return q->userdata; | |
1179 | } | |
93f1bcf4 LP |
1180 | |
1181 | _public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { | |
1182 | assert_return(q, NULL); | |
1183 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1184 | ||
1185 | return q->resolve; | |
1186 | } | |
1187 | ||
1188 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1189 | sd_resolve *resolve = userdata; | |
1190 | int r; | |
1191 | ||
1192 | assert(resolve); | |
1193 | ||
1194 | r = sd_resolve_process(resolve); | |
1195 | if (r < 0) | |
1196 | return r; | |
1197 | ||
1198 | return 1; | |
1199 | } | |
1200 | ||
1201 | _public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int priority) { | |
1202 | int r; | |
1203 | ||
1204 | assert_return(resolve, -EINVAL); | |
1205 | assert_return(!resolve->event, -EBUSY); | |
1206 | ||
1207 | assert(!resolve->event_source); | |
1208 | ||
1209 | if (event) | |
1210 | resolve->event = sd_event_ref(event); | |
1211 | else { | |
1212 | r = sd_event_default(&resolve->event); | |
1213 | if (r < 0) | |
1214 | return r; | |
1215 | } | |
1216 | ||
1217 | r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); | |
1218 | if (r < 0) | |
1219 | goto fail; | |
1220 | ||
1221 | r = sd_event_source_set_priority(resolve->event_source, priority); | |
1222 | if (r < 0) | |
1223 | goto fail; | |
1224 | ||
1225 | return 0; | |
1226 | ||
1227 | fail: | |
1228 | sd_resolve_detach_event(resolve); | |
1229 | return r; | |
1230 | } | |
1231 | ||
1232 | _public_ int sd_resolve_detach_event(sd_resolve *resolve) { | |
1233 | assert_return(resolve, -EINVAL); | |
1234 | ||
1235 | if (!resolve->event) | |
1236 | return 0; | |
1237 | ||
1238 | if (resolve->event_source) { | |
1239 | sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); | |
1240 | resolve->event_source = sd_event_source_unref(resolve->event_source); | |
1241 | } | |
1242 | ||
1243 | resolve->event = sd_event_unref(resolve->event); | |
1244 | return 1; | |
1245 | } | |
1246 | ||
1247 | _public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { | |
1248 | assert_return(resolve, NULL); | |
1249 | ||
1250 | return resolve->event; | |
1251 | } |