]>
Commit | Line | Data |
---|---|---|
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 | |
968d3d24 | 36 | #include "list.h" |
93f1bcf4 LP |
37 | #include "missing.h" |
38 | #include "resolve-util.h" | |
07630cea LP |
39 | #include "socket-util.h" |
40 | #include "util.h" | |
e963e3ad | 41 | |
93f1bcf4 LP |
42 | #define WORKERS_MIN 1U |
43 | #define WORKERS_MAX 16U | |
44 | #define QUERIES_MAX 256U | |
45 | #define BUFSIZE 10240U | |
e963e3ad DB |
46 | |
47 | typedef enum { | |
48 | REQUEST_ADDRINFO, | |
49 | RESPONSE_ADDRINFO, | |
50 | REQUEST_NAMEINFO, | |
51 | RESPONSE_NAMEINFO, | |
e963e3ad DB |
52 | REQUEST_TERMINATE, |
53 | RESPONSE_DIED | |
5599e866 | 54 | } QueryType; |
e963e3ad DB |
55 | |
56 | enum { | |
968d3d24 LP |
57 | REQUEST_RECV_FD, |
58 | REQUEST_SEND_FD, | |
59 | RESPONSE_RECV_FD, | |
60 | RESPONSE_SEND_FD, | |
61 | _FD_MAX | |
e963e3ad DB |
62 | }; |
63 | ||
3bedba4a | 64 | struct sd_resolve { |
93f1bcf4 LP |
65 | unsigned n_ref; |
66 | ||
968d3d24 LP |
67 | bool dead:1; |
68 | pid_t original_pid; | |
e963e3ad | 69 | |
968d3d24 | 70 | int fds[_FD_MAX]; |
e963e3ad | 71 | |
968d3d24 LP |
72 | pthread_t workers[WORKERS_MAX]; |
73 | unsigned n_valid_workers; | |
e963e3ad | 74 | |
85529c81 | 75 | unsigned current_id; |
4a134c49 | 76 | sd_resolve_query* query_array[QUERIES_MAX]; |
96c76ac4 | 77 | unsigned n_queries, n_done, n_outstanding; |
93f1bcf4 LP |
78 | |
79 | sd_event_source *event_source; | |
80 | sd_event *event; | |
e963e3ad | 81 | |
93f1bcf4 LP |
82 | sd_resolve_query *current; |
83 | ||
84 | sd_resolve **default_resolve_ptr; | |
85 | pid_t tid; | |
4a134c49 LP |
86 | |
87 | LIST_HEAD(sd_resolve_query, queries); | |
e963e3ad DB |
88 | }; |
89 | ||
3bedba4a | 90 | struct sd_resolve_query { |
93f1bcf4 LP |
91 | unsigned n_ref; |
92 | ||
4f809256 | 93 | sd_resolve *resolve; |
93f1bcf4 LP |
94 | |
95 | QueryType type:4; | |
968d3d24 | 96 | bool done:1; |
4a134c49 | 97 | bool floating:1; |
e963e3ad | 98 | unsigned id; |
968d3d24 | 99 | |
e963e3ad DB |
100 | int ret; |
101 | int _errno; | |
102 | int _h_errno; | |
103 | struct addrinfo *addrinfo; | |
104 | char *serv, *host; | |
968d3d24 | 105 | |
93f1bcf4 LP |
106 | union { |
107 | sd_resolve_getaddrinfo_handler_t getaddrinfo_handler; | |
108 | sd_resolve_getnameinfo_handler_t getnameinfo_handler; | |
93f1bcf4 | 109 | }; |
968d3d24 | 110 | |
93f1bcf4 | 111 | void *userdata; |
4a134c49 LP |
112 | |
113 | LIST_FIELDS(sd_resolve_query, queries); | |
e963e3ad DB |
114 | }; |
115 | ||
5599e866 DB |
116 | typedef struct RHeader { |
117 | QueryType type; | |
e963e3ad DB |
118 | unsigned id; |
119 | size_t length; | |
5599e866 | 120 | } RHeader; |
e963e3ad | 121 | |
5599e866 DB |
122 | typedef struct AddrInfoRequest { |
123 | struct RHeader header; | |
968d3d24 | 124 | bool hints_valid; |
e963e3ad DB |
125 | int ai_flags; |
126 | int ai_family; | |
127 | int ai_socktype; | |
128 | int ai_protocol; | |
129 | size_t node_len, service_len; | |
5599e866 | 130 | } AddrInfoRequest; |
e963e3ad | 131 | |
5599e866 DB |
132 | typedef struct AddrInfoResponse { |
133 | struct RHeader header; | |
e963e3ad DB |
134 | int ret; |
135 | int _errno; | |
136 | int _h_errno; | |
137 | /* followed by addrinfo_serialization[] */ | |
5599e866 | 138 | } AddrInfoResponse; |
e963e3ad | 139 | |
5599e866 | 140 | typedef struct AddrInfoSerialization { |
e963e3ad DB |
141 | int ai_flags; |
142 | int ai_family; | |
143 | int ai_socktype; | |
144 | int ai_protocol; | |
145 | size_t ai_addrlen; | |
146 | size_t canonname_len; | |
147 | /* Followed by ai_addr amd ai_canonname with variable lengths */ | |
5599e866 | 148 | } AddrInfoSerialization; |
e963e3ad | 149 | |
5599e866 DB |
150 | typedef struct NameInfoRequest { |
151 | struct RHeader header; | |
e963e3ad DB |
152 | int flags; |
153 | socklen_t sockaddr_len; | |
968d3d24 | 154 | bool gethost:1, getserv:1; |
5599e866 | 155 | } NameInfoRequest; |
e963e3ad | 156 | |
5599e866 DB |
157 | typedef struct NameInfoResponse { |
158 | struct RHeader header; | |
e963e3ad DB |
159 | size_t hostlen, servlen; |
160 | int ret; | |
161 | int _errno; | |
162 | int _h_errno; | |
5599e866 | 163 | } NameInfoResponse; |
e963e3ad | 164 | |
5599e866 DB |
165 | typedef union Packet { |
166 | RHeader rheader; | |
167 | AddrInfoRequest addrinfo_request; | |
168 | AddrInfoResponse addrinfo_response; | |
169 | NameInfoRequest nameinfo_request; | |
170 | NameInfoResponse nameinfo_response; | |
5599e866 | 171 | } Packet; |
e963e3ad | 172 | |
93f1bcf4 LP |
173 | static int getaddrinfo_done(sd_resolve_query* q); |
174 | static int getnameinfo_done(sd_resolve_query *q); | |
93f1bcf4 | 175 | |
4a134c49 LP |
176 | static void resolve_query_disconnect(sd_resolve_query *q); |
177 | ||
93f1bcf4 LP |
178 | #define RESOLVE_DONT_DESTROY(resolve) \ |
179 | _cleanup_resolve_unref_ _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) | |
180 | ||
e963e3ad | 181 | static int send_died(int out_fd) { |
968d3d24 | 182 | |
93f1bcf4 LP |
183 | RHeader rh = { |
184 | .type = RESPONSE_DIED, | |
185 | .length = sizeof(RHeader), | |
186 | }; | |
e963e3ad | 187 | |
93f1bcf4 | 188 | assert(out_fd >= 0); |
e963e3ad | 189 | |
968d3d24 LP |
190 | if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0) |
191 | return -errno; | |
192 | ||
193 | return 0; | |
e963e3ad DB |
194 | } |
195 | ||
196 | static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) { | |
5599e866 | 197 | AddrInfoSerialization s; |
e963e3ad | 198 | size_t cnl, l; |
968d3d24 | 199 | |
e963e3ad DB |
200 | assert(p); |
201 | assert(ai); | |
202 | assert(length); | |
203 | assert(*length <= maxlength); | |
204 | ||
968d3d24 | 205 | cnl = ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0; |
5599e866 | 206 | l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl; |
e963e3ad DB |
207 | |
208 | if (*length + l > maxlength) | |
209 | return NULL; | |
210 | ||
211 | s.ai_flags = ai->ai_flags; | |
212 | s.ai_family = ai->ai_family; | |
213 | s.ai_socktype = ai->ai_socktype; | |
214 | s.ai_protocol = ai->ai_protocol; | |
215 | s.ai_addrlen = ai->ai_addrlen; | |
216 | s.canonname_len = cnl; | |
217 | ||
5599e866 DB |
218 | memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization)); |
219 | memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen); | |
e963e3ad DB |
220 | |
221 | if (ai->ai_canonname) | |
968d3d24 | 222 | memcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, 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 */ | |
407 | 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 | ||
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 | ||
463 | return r->original_pid != getpid(); | |
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 LP |
476 | resolve->n_ref = 1; |
477 | resolve->original_pid = getpid(); | |
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 | ||
583 | /* Now terminate them and wait until they are gone. */ | |
968d3d24 | 584 | for (i = 0; i < resolve->n_valid_workers; i++) { |
e963e3ad | 585 | for (;;) { |
968d3d24 | 586 | if (pthread_join(resolve->workers[i], NULL) != EINTR) |
e963e3ad DB |
587 | break; |
588 | } | |
589 | } | |
590 | ||
591 | /* Close all communication channels */ | |
968d3d24 | 592 | for (i = 0; i < _FD_MAX; i++) |
03e334a1 | 593 | safe_close(resolve->fds[i]); |
e963e3ad | 594 | |
3bedba4a | 595 | free(resolve); |
93f1bcf4 LP |
596 | } |
597 | ||
598 | _public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { | |
599 | assert_return(resolve, NULL); | |
600 | ||
601 | assert(resolve->n_ref >= 1); | |
602 | resolve->n_ref++; | |
603 | ||
604 | return resolve; | |
605 | } | |
606 | ||
607 | _public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { | |
608 | ||
609 | if (!resolve) | |
610 | return NULL; | |
611 | ||
612 | assert(resolve->n_ref >= 1); | |
613 | resolve->n_ref--; | |
614 | ||
615 | if (resolve->n_ref <= 0) | |
616 | resolve_free(resolve); | |
617 | ||
968d3d24 | 618 | return NULL; |
e963e3ad DB |
619 | } |
620 | ||
968d3d24 LP |
621 | _public_ int sd_resolve_get_fd(sd_resolve *resolve) { |
622 | assert_return(resolve, -EINVAL); | |
623 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 624 | |
3bedba4a | 625 | return resolve->fds[RESPONSE_RECV_FD]; |
e963e3ad DB |
626 | } |
627 | ||
968d3d24 LP |
628 | _public_ int sd_resolve_get_events(sd_resolve *resolve) { |
629 | assert_return(resolve, -EINVAL); | |
630 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
631 | ||
632 | return resolve->n_queries > resolve->n_done ? POLLIN : 0; | |
633 | } | |
634 | ||
635 | _public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { | |
636 | assert_return(resolve, -EINVAL); | |
637 | assert_return(usec, -EINVAL); | |
638 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
639 | ||
640 | *usec = (uint64_t) -1; | |
641 | return 0; | |
642 | } | |
643 | ||
4f809256 DB |
644 | static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { |
645 | sd_resolve_query *q; | |
968d3d24 | 646 | |
3bedba4a | 647 | assert(resolve); |
e963e3ad | 648 | |
4a134c49 | 649 | q = resolve->query_array[id % QUERIES_MAX]; |
8e50b5a7 | 650 | if (q) |
e963e3ad DB |
651 | if (q->id == id) |
652 | return q; | |
653 | ||
654 | return NULL; | |
655 | } | |
656 | ||
93f1bcf4 LP |
657 | static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { |
658 | int r; | |
659 | ||
e963e3ad DB |
660 | assert(q); |
661 | assert(!q->done); | |
93f1bcf4 | 662 | assert(q->resolve == resolve); |
e963e3ad | 663 | |
968d3d24 | 664 | q->done = true; |
93f1bcf4 LP |
665 | resolve->n_done ++; |
666 | ||
73dec319 | 667 | resolve->current = sd_resolve_query_ref(q); |
93f1bcf4 LP |
668 | |
669 | switch (q->type) { | |
670 | ||
671 | case REQUEST_ADDRINFO: | |
672 | r = getaddrinfo_done(q); | |
673 | break; | |
674 | ||
675 | case REQUEST_NAMEINFO: | |
676 | r = getnameinfo_done(q); | |
677 | break; | |
678 | ||
93f1bcf4 LP |
679 | default: |
680 | assert_not_reached("Cannot complete unknown query type"); | |
681 | } | |
682 | ||
502fe44e | 683 | resolve->current = NULL; |
93f1bcf4 | 684 | |
4a134c49 LP |
685 | if (q->floating) { |
686 | resolve_query_disconnect(q); | |
f2e2415d | 687 | sd_resolve_query_unref(q); |
4a134c49 LP |
688 | } |
689 | ||
502fe44e LP |
690 | sd_resolve_query_unref(q); |
691 | ||
93f1bcf4 | 692 | return r; |
e963e3ad DB |
693 | } |
694 | ||
968d3d24 | 695 | static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { |
5599e866 | 696 | AddrInfoSerialization s; |
e963e3ad DB |
697 | size_t l; |
698 | struct addrinfo *ai; | |
968d3d24 | 699 | |
e963e3ad | 700 | assert(p); |
968d3d24 | 701 | assert(*p); |
e963e3ad DB |
702 | assert(ret_ai); |
703 | assert(length); | |
704 | ||
5599e866 | 705 | if (*length < sizeof(AddrInfoSerialization)) |
968d3d24 | 706 | return -EBADMSG; |
e963e3ad | 707 | |
968d3d24 | 708 | memcpy(&s, *p, sizeof(s)); |
e963e3ad | 709 | |
5599e866 | 710 | l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; |
e963e3ad | 711 | if (*length < l) |
968d3d24 | 712 | return -EBADMSG; |
e963e3ad | 713 | |
968d3d24 | 714 | ai = new0(struct addrinfo, 1); |
8e50b5a7 | 715 | if (!ai) |
968d3d24 | 716 | return -ENOMEM; |
e963e3ad DB |
717 | |
718 | ai->ai_flags = s.ai_flags; | |
719 | ai->ai_family = s.ai_family; | |
720 | ai->ai_socktype = s.ai_socktype; | |
721 | ai->ai_protocol = s.ai_protocol; | |
722 | ai->ai_addrlen = s.ai_addrlen; | |
723 | ||
968d3d24 LP |
724 | if (s.ai_addrlen > 0) { |
725 | ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); | |
726 | if (!ai->ai_addr) { | |
727 | free(ai); | |
728 | return -ENOMEM; | |
729 | } | |
730 | } | |
e963e3ad | 731 | |
968d3d24 LP |
732 | if (s.canonname_len > 0) { |
733 | ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); | |
734 | if (!ai->ai_canonname) { | |
735 | free(ai->ai_addr); | |
736 | free(ai); | |
737 | return -ENOMEM; | |
738 | } | |
739 | } | |
e963e3ad DB |
740 | |
741 | *length -= l; | |
742 | *ret_ai = ai; | |
968d3d24 | 743 | *p = ((const uint8_t*) *p) + l; |
e963e3ad | 744 | |
968d3d24 | 745 | return 0; |
e963e3ad DB |
746 | } |
747 | ||
5599e866 DB |
748 | static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { |
749 | const RHeader *resp; | |
4f809256 | 750 | sd_resolve_query *q; |
968d3d24 | 751 | int r; |
e963e3ad | 752 | |
3bedba4a | 753 | assert(resolve); |
e963e3ad DB |
754 | |
755 | resp = &packet->rheader; | |
756 | assert(resp); | |
5599e866 | 757 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
758 | assert(length == resp->length); |
759 | ||
760 | if (resp->type == RESPONSE_DIED) { | |
968d3d24 | 761 | resolve->dead = true; |
e963e3ad DB |
762 | return 0; |
763 | } | |
764 | ||
96c76ac4 LP |
765 | assert(resolve->n_outstanding > 0); |
766 | resolve->n_outstanding--; | |
767 | ||
3bedba4a | 768 | q = lookup_query(resolve, resp->id); |
8e50b5a7 | 769 | if (!q) |
e963e3ad DB |
770 | return 0; |
771 | ||
772 | switch (resp->type) { | |
968d3d24 | 773 | |
e963e3ad | 774 | case RESPONSE_ADDRINFO: { |
5599e866 | 775 | const AddrInfoResponse *ai_resp = &packet->addrinfo_response; |
e963e3ad DB |
776 | const void *p; |
777 | size_t l; | |
778 | struct addrinfo *prev = NULL; | |
779 | ||
5599e866 | 780 | assert(length >= sizeof(AddrInfoResponse)); |
e963e3ad DB |
781 | assert(q->type == REQUEST_ADDRINFO); |
782 | ||
783 | q->ret = ai_resp->ret; | |
784 | q->_errno = ai_resp->_errno; | |
785 | q->_h_errno = ai_resp->_h_errno; | |
968d3d24 | 786 | |
5599e866 DB |
787 | l = length - sizeof(AddrInfoResponse); |
788 | p = (const uint8_t*) resp + sizeof(AddrInfoResponse); | |
e963e3ad DB |
789 | |
790 | while (l > 0 && p) { | |
791 | struct addrinfo *ai = NULL; | |
e963e3ad | 792 | |
968d3d24 LP |
793 | r = unserialize_addrinfo(&p, &l, &ai); |
794 | if (r < 0) { | |
795 | q->ret = EAI_SYSTEM; | |
796 | q->_errno = -r; | |
797 | q->_h_errno = 0; | |
798 | freeaddrinfo(q->addrinfo); | |
799 | q->addrinfo = NULL; | |
e963e3ad DB |
800 | break; |
801 | } | |
802 | ||
803 | if (prev) | |
804 | prev->ai_next = ai; | |
805 | else | |
806 | q->addrinfo = ai; | |
807 | ||
808 | prev = ai; | |
809 | } | |
810 | ||
93f1bcf4 | 811 | return complete_query(resolve, q); |
e963e3ad DB |
812 | } |
813 | ||
814 | case RESPONSE_NAMEINFO: { | |
5599e866 | 815 | const NameInfoResponse *ni_resp = &packet->nameinfo_response; |
e963e3ad | 816 | |
5599e866 | 817 | assert(length >= sizeof(NameInfoResponse)); |
e963e3ad DB |
818 | assert(q->type == REQUEST_NAMEINFO); |
819 | ||
820 | q->ret = ni_resp->ret; | |
821 | q->_errno = ni_resp->_errno; | |
822 | q->_h_errno = ni_resp->_h_errno; | |
823 | ||
968d3d24 LP |
824 | if (ni_resp->hostlen > 0) { |
825 | q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); | |
826 | if (!q->host) { | |
e963e3ad | 827 | q->ret = EAI_MEMORY; |
968d3d24 LP |
828 | q->_errno = ENOMEM; |
829 | q->_h_errno = 0; | |
830 | } | |
831 | } | |
e963e3ad | 832 | |
968d3d24 LP |
833 | if (ni_resp->servlen > 0) { |
834 | q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); | |
835 | if (!q->serv) { | |
e963e3ad | 836 | q->ret = EAI_MEMORY; |
968d3d24 LP |
837 | q->_errno = ENOMEM; |
838 | q->_h_errno = 0; | |
839 | } | |
840 | } | |
e963e3ad | 841 | |
93f1bcf4 | 842 | return complete_query(resolve, q); |
e963e3ad DB |
843 | } |
844 | ||
e963e3ad | 845 | default: |
93f1bcf4 | 846 | return 0; |
e963e3ad | 847 | } |
e963e3ad DB |
848 | } |
849 | ||
968d3d24 | 850 | _public_ int sd_resolve_process(sd_resolve *resolve) { |
93f1bcf4 LP |
851 | RESOLVE_DONT_DESTROY(resolve); |
852 | ||
853 | union { | |
854 | Packet packet; | |
855 | uint8_t space[BUFSIZE]; | |
856 | } buf; | |
857 | ssize_t l; | |
858 | int r; | |
968d3d24 LP |
859 | |
860 | assert_return(resolve, -EINVAL); | |
861 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 862 | |
93f1bcf4 LP |
863 | /* We don't allow recursively invoking sd_resolve_process(). */ |
864 | assert_return(!resolve->current, -EBUSY); | |
e963e3ad | 865 | |
93f1bcf4 LP |
866 | l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); |
867 | if (l < 0) { | |
868 | if (errno == EAGAIN) | |
869 | return 0; | |
968d3d24 | 870 | |
93f1bcf4 LP |
871 | return -errno; |
872 | } | |
873 | if (l == 0) | |
874 | return -ECONNREFUSED; | |
e963e3ad | 875 | |
93f1bcf4 LP |
876 | r = handle_response(resolve, &buf.packet, (size_t) l); |
877 | if (r < 0) | |
878 | return r; | |
e963e3ad | 879 | |
93f1bcf4 | 880 | return 1; |
968d3d24 | 881 | } |
e963e3ad | 882 | |
968d3d24 LP |
883 | _public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { |
884 | int r; | |
e963e3ad | 885 | |
968d3d24 LP |
886 | assert_return(resolve, -EINVAL); |
887 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 888 | |
93f1bcf4 | 889 | if (resolve->n_done >= resolve->n_queries) |
968d3d24 | 890 | return 0; |
e963e3ad | 891 | |
968d3d24 LP |
892 | do { |
893 | r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); | |
894 | } while (r == -EINTR); | |
e963e3ad | 895 | |
968d3d24 LP |
896 | if (r < 0) |
897 | return r; | |
e963e3ad | 898 | |
968d3d24 | 899 | return sd_resolve_process(resolve); |
e963e3ad DB |
900 | } |
901 | ||
4a134c49 | 902 | static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { |
4f809256 | 903 | sd_resolve_query *q; |
968d3d24 LP |
904 | int r; |
905 | ||
3bedba4a | 906 | assert(resolve); |
968d3d24 | 907 | assert(_q); |
e963e3ad | 908 | |
968d3d24 LP |
909 | if (resolve->n_queries >= QUERIES_MAX) |
910 | return -ENOBUFS; | |
911 | ||
912 | r = start_threads(resolve, 1); | |
913 | if (r < 0) | |
914 | return r; | |
e963e3ad | 915 | |
85529c81 | 916 | while (resolve->query_array[resolve->current_id % QUERIES_MAX]) |
3bedba4a | 917 | resolve->current_id++; |
e963e3ad | 918 | |
85529c81 | 919 | q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); |
968d3d24 LP |
920 | if (!q) |
921 | return -ENOMEM; | |
e963e3ad | 922 | |
93f1bcf4 | 923 | q->n_ref = 1; |
4a134c49 LP |
924 | q->resolve = resolve; |
925 | q->floating = floating; | |
85529c81 | 926 | q->id = resolve->current_id++; |
968d3d24 | 927 | |
4a134c49 LP |
928 | if (!floating) |
929 | sd_resolve_ref(resolve); | |
930 | ||
931 | LIST_PREPEND(queries, resolve->queries, q); | |
93f1bcf4 LP |
932 | resolve->n_queries++; |
933 | ||
968d3d24 LP |
934 | *_q = q; |
935 | return 0; | |
e963e3ad DB |
936 | } |
937 | ||
968d3d24 LP |
938 | _public_ int sd_resolve_getaddrinfo( |
939 | sd_resolve *resolve, | |
151b9b96 | 940 | sd_resolve_query **_q, |
93f1bcf4 LP |
941 | const char *node, const char *service, |
942 | const struct addrinfo *hints, | |
943 | sd_resolve_getaddrinfo_handler_t callback, void *userdata) { | |
968d3d24 LP |
944 | |
945 | AddrInfoRequest req = {}; | |
946 | struct msghdr mh = {}; | |
947 | struct iovec iov[3]; | |
4f809256 | 948 | sd_resolve_query *q; |
968d3d24 | 949 | int r; |
e963e3ad | 950 | |
968d3d24 | 951 | assert_return(resolve, -EINVAL); |
93f1bcf4 LP |
952 | assert_return(node || service, -EINVAL); |
953 | assert_return(callback, -EINVAL); | |
968d3d24 | 954 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 955 | |
4a134c49 | 956 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
957 | if (r < 0) |
958 | return r; | |
e963e3ad | 959 | |
93f1bcf4 LP |
960 | q->type = REQUEST_ADDRINFO; |
961 | q->getaddrinfo_handler = callback; | |
962 | q->userdata = userdata; | |
963 | ||
968d3d24 LP |
964 | req.node_len = node ? strlen(node)+1 : 0; |
965 | req.service_len = service ? strlen(service)+1 : 0; | |
e963e3ad | 966 | |
968d3d24 | 967 | req.header.id = q->id; |
93f1bcf4 | 968 | req.header.type = REQUEST_ADDRINFO; |
968d3d24 | 969 | req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; |
e963e3ad | 970 | |
968d3d24 LP |
971 | if (hints) { |
972 | req.hints_valid = true; | |
973 | req.ai_flags = hints->ai_flags; | |
974 | req.ai_family = hints->ai_family; | |
975 | req.ai_socktype = hints->ai_socktype; | |
976 | req.ai_protocol = hints->ai_protocol; | |
e963e3ad DB |
977 | } |
978 | ||
968d3d24 | 979 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; |
e963e3ad | 980 | if (node) |
968d3d24 | 981 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; |
e963e3ad | 982 | if (service) |
968d3d24 | 983 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; |
968d3d24 | 984 | mh.msg_iov = iov; |
e963e3ad | 985 | |
968d3d24 | 986 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 987 | sd_resolve_query_unref(q); |
968d3d24 LP |
988 | return -errno; |
989 | } | |
e963e3ad | 990 | |
96c76ac4 LP |
991 | resolve->n_outstanding++; |
992 | ||
4a134c49 LP |
993 | if (_q) |
994 | *_q = q; | |
995 | ||
968d3d24 | 996 | return 0; |
e963e3ad DB |
997 | } |
998 | ||
93f1bcf4 LP |
999 | static int getaddrinfo_done(sd_resolve_query* q) { |
1000 | assert(q); | |
1001 | assert(q->done); | |
1002 | assert(q->getaddrinfo_handler); | |
e963e3ad | 1003 | |
93f1bcf4 LP |
1004 | errno = q->_errno; |
1005 | h_errno = q->_h_errno; | |
e963e3ad | 1006 | |
93f1bcf4 | 1007 | return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); |
e963e3ad DB |
1008 | } |
1009 | ||
968d3d24 LP |
1010 | _public_ int sd_resolve_getnameinfo( |
1011 | sd_resolve *resolve, | |
151b9b96 | 1012 | sd_resolve_query**_q, |
968d3d24 LP |
1013 | const struct sockaddr *sa, socklen_t salen, |
1014 | int flags, | |
93f1bcf4 LP |
1015 | uint64_t get, |
1016 | sd_resolve_getnameinfo_handler_t callback, | |
1017 | void *userdata) { | |
e963e3ad | 1018 | |
968d3d24 LP |
1019 | NameInfoRequest req = {}; |
1020 | struct msghdr mh = {}; | |
1021 | struct iovec iov[2]; | |
1022 | sd_resolve_query *q; | |
1023 | int r; | |
e963e3ad | 1024 | |
968d3d24 LP |
1025 | assert_return(resolve, -EINVAL); |
1026 | assert_return(sa, -EINVAL); | |
1027 | assert_return(salen >= sizeof(struct sockaddr), -EINVAL); | |
1028 | assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); | |
93f1bcf4 LP |
1029 | assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); |
1030 | assert_return(callback, -EINVAL); | |
968d3d24 | 1031 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 1032 | |
4a134c49 | 1033 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
1034 | if (r < 0) |
1035 | return r; | |
e963e3ad | 1036 | |
93f1bcf4 LP |
1037 | q->type = REQUEST_NAMEINFO; |
1038 | q->getnameinfo_handler = callback; | |
1039 | q->userdata = userdata; | |
1040 | ||
968d3d24 | 1041 | req.header.id = q->id; |
93f1bcf4 | 1042 | req.header.type = REQUEST_NAMEINFO; |
968d3d24 | 1043 | req.header.length = sizeof(NameInfoRequest) + salen; |
e963e3ad | 1044 | |
968d3d24 LP |
1045 | req.flags = flags; |
1046 | req.sockaddr_len = salen; | |
93f1bcf4 LP |
1047 | req.gethost = !!(get & SD_RESOLVE_GET_HOST); |
1048 | req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); | |
e963e3ad | 1049 | |
968d3d24 LP |
1050 | iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; |
1051 | iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; | |
e963e3ad | 1052 | |
968d3d24 LP |
1053 | mh.msg_iov = iov; |
1054 | mh.msg_iovlen = 2; | |
e963e3ad | 1055 | |
968d3d24 | 1056 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 1057 | sd_resolve_query_unref(q); |
968d3d24 LP |
1058 | return -errno; |
1059 | } | |
e963e3ad | 1060 | |
96c76ac4 LP |
1061 | resolve->n_outstanding++; |
1062 | ||
4a134c49 LP |
1063 | if (_q) |
1064 | *_q = q; | |
1065 | ||
968d3d24 | 1066 | return 0; |
e963e3ad DB |
1067 | } |
1068 | ||
93f1bcf4 | 1069 | static int getnameinfo_done(sd_resolve_query *q) { |
968d3d24 | 1070 | |
93f1bcf4 LP |
1071 | assert(q); |
1072 | assert(q->done); | |
1073 | assert(q->getnameinfo_handler); | |
e963e3ad | 1074 | |
93f1bcf4 LP |
1075 | errno = q->_errno; |
1076 | h_errno= q->_h_errno; | |
e963e3ad | 1077 | |
93f1bcf4 | 1078 | return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); |
e963e3ad DB |
1079 | } |
1080 | ||
93f1bcf4 LP |
1081 | _public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { |
1082 | assert_return(q, NULL); | |
e963e3ad | 1083 | |
93f1bcf4 LP |
1084 | assert(q->n_ref >= 1); |
1085 | q->n_ref++; | |
968d3d24 | 1086 | |
93f1bcf4 | 1087 | return q; |
e963e3ad DB |
1088 | } |
1089 | ||
93f1bcf4 LP |
1090 | static void resolve_freeaddrinfo(struct addrinfo *ai) { |
1091 | while (ai) { | |
1092 | struct addrinfo *next = ai->ai_next; | |
e963e3ad | 1093 | |
93f1bcf4 LP |
1094 | free(ai->ai_addr); |
1095 | free(ai->ai_canonname); | |
1096 | free(ai); | |
1097 | ai = next; | |
1098 | } | |
1099 | } | |
e963e3ad | 1100 | |
4a134c49 LP |
1101 | static void resolve_query_disconnect(sd_resolve_query *q) { |
1102 | sd_resolve *resolve; | |
93f1bcf4 | 1103 | unsigned i; |
e963e3ad | 1104 | |
93f1bcf4 | 1105 | assert(q); |
4a134c49 LP |
1106 | |
1107 | if (!q->resolve) | |
1108 | return; | |
1109 | ||
1110 | resolve = q->resolve; | |
1111 | assert(resolve->n_queries > 0); | |
e963e3ad | 1112 | |
968d3d24 | 1113 | if (q->done) { |
4a134c49 LP |
1114 | assert(resolve->n_done > 0); |
1115 | resolve->n_done--; | |
e963e3ad DB |
1116 | } |
1117 | ||
968d3d24 | 1118 | i = q->id % QUERIES_MAX; |
4a134c49 LP |
1119 | assert(resolve->query_array[i] == q); |
1120 | resolve->query_array[i] = NULL; | |
1121 | LIST_REMOVE(queries, resolve->queries, q); | |
1122 | resolve->n_queries--; | |
1123 | ||
1124 | q->resolve = NULL; | |
1125 | if (!q->floating) | |
1126 | sd_resolve_unref(resolve); | |
1127 | } | |
1128 | ||
1129 | static void resolve_query_free(sd_resolve_query *q) { | |
1130 | assert(q); | |
1131 | ||
1132 | resolve_query_disconnect(q); | |
e963e3ad | 1133 | |
93f1bcf4 | 1134 | resolve_freeaddrinfo(q->addrinfo); |
e963e3ad DB |
1135 | free(q->host); |
1136 | free(q->serv); | |
e963e3ad | 1137 | free(q); |
e963e3ad DB |
1138 | } |
1139 | ||
93f1bcf4 LP |
1140 | _public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { |
1141 | if (!q) | |
1142 | return NULL; | |
e963e3ad | 1143 | |
93f1bcf4 LP |
1144 | assert(q->n_ref >= 1); |
1145 | q->n_ref--; | |
e963e3ad | 1146 | |
93f1bcf4 LP |
1147 | if (q->n_ref <= 0) |
1148 | resolve_query_free(q); | |
e963e3ad | 1149 | |
93f1bcf4 | 1150 | return NULL; |
e963e3ad DB |
1151 | } |
1152 | ||
93f1bcf4 | 1153 | _public_ int sd_resolve_query_is_done(sd_resolve_query *q) { |
968d3d24 LP |
1154 | assert_return(q, -EINVAL); |
1155 | assert_return(!resolve_pid_changed(q->resolve), -ECHILD); | |
e963e3ad DB |
1156 | |
1157 | return q->done; | |
1158 | } | |
1159 | ||
93f1bcf4 | 1160 | _public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { |
968d3d24 | 1161 | void *ret; |
e963e3ad | 1162 | |
968d3d24 LP |
1163 | assert_return(q, NULL); |
1164 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1165 | ||
1166 | ret = q->userdata; | |
e963e3ad | 1167 | q->userdata = userdata; |
968d3d24 LP |
1168 | |
1169 | return ret; | |
e963e3ad DB |
1170 | } |
1171 | ||
93f1bcf4 | 1172 | _public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { |
968d3d24 LP |
1173 | assert_return(q, NULL); |
1174 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
e963e3ad DB |
1175 | |
1176 | return q->userdata; | |
1177 | } | |
93f1bcf4 LP |
1178 | |
1179 | _public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { | |
1180 | assert_return(q, NULL); | |
1181 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1182 | ||
1183 | return q->resolve; | |
1184 | } | |
1185 | ||
1186 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1187 | sd_resolve *resolve = userdata; | |
1188 | int r; | |
1189 | ||
1190 | assert(resolve); | |
1191 | ||
1192 | r = sd_resolve_process(resolve); | |
1193 | if (r < 0) | |
1194 | return r; | |
1195 | ||
1196 | return 1; | |
1197 | } | |
1198 | ||
1199 | _public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int priority) { | |
1200 | int r; | |
1201 | ||
1202 | assert_return(resolve, -EINVAL); | |
1203 | assert_return(!resolve->event, -EBUSY); | |
1204 | ||
1205 | assert(!resolve->event_source); | |
1206 | ||
1207 | if (event) | |
1208 | resolve->event = sd_event_ref(event); | |
1209 | else { | |
1210 | r = sd_event_default(&resolve->event); | |
1211 | if (r < 0) | |
1212 | return r; | |
1213 | } | |
1214 | ||
1215 | r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); | |
1216 | if (r < 0) | |
1217 | goto fail; | |
1218 | ||
1219 | r = sd_event_source_set_priority(resolve->event_source, priority); | |
1220 | if (r < 0) | |
1221 | goto fail; | |
1222 | ||
1223 | return 0; | |
1224 | ||
1225 | fail: | |
1226 | sd_resolve_detach_event(resolve); | |
1227 | return r; | |
1228 | } | |
1229 | ||
1230 | _public_ int sd_resolve_detach_event(sd_resolve *resolve) { | |
1231 | assert_return(resolve, -EINVAL); | |
1232 | ||
1233 | if (!resolve->event) | |
1234 | return 0; | |
1235 | ||
1236 | if (resolve->event_source) { | |
1237 | sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); | |
1238 | resolve->event_source = sd_event_source_unref(resolve->event_source); | |
1239 | } | |
1240 | ||
1241 | resolve->event = sd_event_unref(resolve->event); | |
1242 | return 1; | |
1243 | } | |
1244 | ||
1245 | _public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { | |
1246 | assert_return(resolve, NULL); | |
1247 | ||
1248 | return resolve->event; | |
1249 | } |