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Commit | Line | Data |
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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" |
968d3d24 | 37 | #include "list.h" |
93f1bcf4 LP |
38 | #include "missing.h" |
39 | #include "resolve-util.h" | |
07630cea LP |
40 | #include "socket-util.h" |
41 | #include "util.h" | |
e963e3ad | 42 | |
93f1bcf4 LP |
43 | #define WORKERS_MIN 1U |
44 | #define WORKERS_MAX 16U | |
45 | #define QUERIES_MAX 256U | |
46 | #define BUFSIZE 10240U | |
e963e3ad DB |
47 | |
48 | typedef enum { | |
49 | REQUEST_ADDRINFO, | |
50 | RESPONSE_ADDRINFO, | |
51 | REQUEST_NAMEINFO, | |
52 | RESPONSE_NAMEINFO, | |
e963e3ad DB |
53 | REQUEST_TERMINATE, |
54 | RESPONSE_DIED | |
5599e866 | 55 | } QueryType; |
e963e3ad DB |
56 | |
57 | enum { | |
968d3d24 LP |
58 | REQUEST_RECV_FD, |
59 | REQUEST_SEND_FD, | |
60 | RESPONSE_RECV_FD, | |
61 | RESPONSE_SEND_FD, | |
62 | _FD_MAX | |
e963e3ad DB |
63 | }; |
64 | ||
3bedba4a | 65 | struct sd_resolve { |
93f1bcf4 LP |
66 | unsigned n_ref; |
67 | ||
968d3d24 LP |
68 | bool dead:1; |
69 | pid_t original_pid; | |
e963e3ad | 70 | |
968d3d24 | 71 | int fds[_FD_MAX]; |
e963e3ad | 72 | |
968d3d24 LP |
73 | pthread_t workers[WORKERS_MAX]; |
74 | unsigned n_valid_workers; | |
e963e3ad | 75 | |
85529c81 | 76 | unsigned current_id; |
4a134c49 | 77 | sd_resolve_query* query_array[QUERIES_MAX]; |
96c76ac4 | 78 | unsigned n_queries, n_done, n_outstanding; |
93f1bcf4 LP |
79 | |
80 | sd_event_source *event_source; | |
81 | sd_event *event; | |
e963e3ad | 82 | |
93f1bcf4 LP |
83 | sd_resolve_query *current; |
84 | ||
85 | sd_resolve **default_resolve_ptr; | |
86 | pid_t tid; | |
4a134c49 LP |
87 | |
88 | LIST_HEAD(sd_resolve_query, queries); | |
e963e3ad DB |
89 | }; |
90 | ||
3bedba4a | 91 | struct sd_resolve_query { |
93f1bcf4 LP |
92 | unsigned n_ref; |
93 | ||
4f809256 | 94 | sd_resolve *resolve; |
93f1bcf4 LP |
95 | |
96 | QueryType type:4; | |
968d3d24 | 97 | bool done:1; |
4a134c49 | 98 | bool floating:1; |
e963e3ad | 99 | unsigned id; |
968d3d24 | 100 | |
e963e3ad DB |
101 | int ret; |
102 | int _errno; | |
103 | int _h_errno; | |
104 | struct addrinfo *addrinfo; | |
105 | char *serv, *host; | |
968d3d24 | 106 | |
93f1bcf4 LP |
107 | union { |
108 | sd_resolve_getaddrinfo_handler_t getaddrinfo_handler; | |
109 | sd_resolve_getnameinfo_handler_t getnameinfo_handler; | |
93f1bcf4 | 110 | }; |
968d3d24 | 111 | |
93f1bcf4 | 112 | void *userdata; |
4a134c49 LP |
113 | |
114 | LIST_FIELDS(sd_resolve_query, queries); | |
e963e3ad DB |
115 | }; |
116 | ||
5599e866 DB |
117 | typedef struct RHeader { |
118 | QueryType type; | |
e963e3ad DB |
119 | unsigned id; |
120 | size_t length; | |
5599e866 | 121 | } RHeader; |
e963e3ad | 122 | |
5599e866 DB |
123 | typedef struct AddrInfoRequest { |
124 | struct RHeader header; | |
968d3d24 | 125 | bool hints_valid; |
e963e3ad DB |
126 | int ai_flags; |
127 | int ai_family; | |
128 | int ai_socktype; | |
129 | int ai_protocol; | |
130 | size_t node_len, service_len; | |
5599e866 | 131 | } AddrInfoRequest; |
e963e3ad | 132 | |
5599e866 DB |
133 | typedef struct AddrInfoResponse { |
134 | struct RHeader header; | |
e963e3ad DB |
135 | int ret; |
136 | int _errno; | |
137 | int _h_errno; | |
138 | /* followed by addrinfo_serialization[] */ | |
5599e866 | 139 | } AddrInfoResponse; |
e963e3ad | 140 | |
5599e866 | 141 | typedef struct AddrInfoSerialization { |
e963e3ad DB |
142 | int ai_flags; |
143 | int ai_family; | |
144 | int ai_socktype; | |
145 | int ai_protocol; | |
146 | size_t ai_addrlen; | |
147 | size_t canonname_len; | |
148 | /* Followed by ai_addr amd ai_canonname with variable lengths */ | |
5599e866 | 149 | } AddrInfoSerialization; |
e963e3ad | 150 | |
5599e866 DB |
151 | typedef struct NameInfoRequest { |
152 | struct RHeader header; | |
e963e3ad DB |
153 | int flags; |
154 | socklen_t sockaddr_len; | |
968d3d24 | 155 | bool gethost:1, getserv:1; |
5599e866 | 156 | } NameInfoRequest; |
e963e3ad | 157 | |
5599e866 DB |
158 | typedef struct NameInfoResponse { |
159 | struct RHeader header; | |
e963e3ad DB |
160 | size_t hostlen, servlen; |
161 | int ret; | |
162 | int _errno; | |
163 | int _h_errno; | |
5599e866 | 164 | } NameInfoResponse; |
e963e3ad | 165 | |
5599e866 DB |
166 | typedef union Packet { |
167 | RHeader rheader; | |
168 | AddrInfoRequest addrinfo_request; | |
169 | AddrInfoResponse addrinfo_response; | |
170 | NameInfoRequest nameinfo_request; | |
171 | NameInfoResponse nameinfo_response; | |
5599e866 | 172 | } Packet; |
e963e3ad | 173 | |
93f1bcf4 LP |
174 | static int getaddrinfo_done(sd_resolve_query* q); |
175 | static int getnameinfo_done(sd_resolve_query *q); | |
93f1bcf4 | 176 | |
4a134c49 LP |
177 | static void resolve_query_disconnect(sd_resolve_query *q); |
178 | ||
93f1bcf4 LP |
179 | #define RESOLVE_DONT_DESTROY(resolve) \ |
180 | _cleanup_resolve_unref_ _unused_ sd_resolve *_dont_destroy_##resolve = sd_resolve_ref(resolve) | |
181 | ||
e963e3ad | 182 | static int send_died(int out_fd) { |
968d3d24 | 183 | |
93f1bcf4 LP |
184 | RHeader rh = { |
185 | .type = RESPONSE_DIED, | |
186 | .length = sizeof(RHeader), | |
187 | }; | |
e963e3ad | 188 | |
93f1bcf4 | 189 | assert(out_fd >= 0); |
e963e3ad | 190 | |
968d3d24 LP |
191 | if (send(out_fd, &rh, rh.length, MSG_NOSIGNAL) < 0) |
192 | return -errno; | |
193 | ||
194 | return 0; | |
e963e3ad DB |
195 | } |
196 | ||
197 | static void *serialize_addrinfo(void *p, const struct addrinfo *ai, size_t *length, size_t maxlength) { | |
5599e866 | 198 | AddrInfoSerialization s; |
e963e3ad | 199 | size_t cnl, l; |
968d3d24 | 200 | |
e963e3ad DB |
201 | assert(p); |
202 | assert(ai); | |
203 | assert(length); | |
204 | assert(*length <= maxlength); | |
205 | ||
968d3d24 | 206 | cnl = ai->ai_canonname ? strlen(ai->ai_canonname)+1 : 0; |
5599e866 | 207 | l = sizeof(AddrInfoSerialization) + ai->ai_addrlen + cnl; |
e963e3ad DB |
208 | |
209 | if (*length + l > maxlength) | |
210 | return NULL; | |
211 | ||
212 | s.ai_flags = ai->ai_flags; | |
213 | s.ai_family = ai->ai_family; | |
214 | s.ai_socktype = ai->ai_socktype; | |
215 | s.ai_protocol = ai->ai_protocol; | |
216 | s.ai_addrlen = ai->ai_addrlen; | |
217 | s.canonname_len = cnl; | |
218 | ||
5599e866 DB |
219 | memcpy((uint8_t*) p, &s, sizeof(AddrInfoSerialization)); |
220 | memcpy((uint8_t*) p + sizeof(AddrInfoSerialization), ai->ai_addr, ai->ai_addrlen); | |
e963e3ad DB |
221 | |
222 | if (ai->ai_canonname) | |
968d3d24 | 223 | memcpy((char*) p + sizeof(AddrInfoSerialization) + ai->ai_addrlen, ai->ai_canonname, cnl); |
e963e3ad DB |
224 | |
225 | *length += l; | |
226 | return (uint8_t*) p + l; | |
227 | } | |
228 | ||
968d3d24 LP |
229 | static int send_addrinfo_reply( |
230 | int out_fd, | |
231 | unsigned id, | |
232 | int ret, | |
233 | struct addrinfo *ai, | |
234 | int _errno, | |
235 | int _h_errno) { | |
236 | ||
93f1bcf4 LP |
237 | AddrInfoResponse resp = { |
238 | .header.type = RESPONSE_ADDRINFO, | |
239 | .header.id = id, | |
240 | .header.length = sizeof(AddrInfoResponse), | |
241 | .ret = ret, | |
242 | ._errno = _errno, | |
243 | ._h_errno = _h_errno, | |
244 | }; | |
245 | ||
968d3d24 LP |
246 | struct msghdr mh = {}; |
247 | struct iovec iov[2]; | |
248 | union { | |
249 | AddrInfoSerialization ais; | |
250 | uint8_t space[BUFSIZE]; | |
251 | } buffer; | |
252 | ||
e963e3ad DB |
253 | assert(out_fd >= 0); |
254 | ||
e963e3ad | 255 | if (ret == 0 && ai) { |
968d3d24 | 256 | void *p = &buffer; |
e963e3ad DB |
257 | struct addrinfo *k; |
258 | ||
259 | for (k = ai; k; k = k->ai_next) { | |
968d3d24 | 260 | p = serialize_addrinfo(p, k, &resp.header.length, (uint8_t*) &buffer + BUFSIZE - (uint8_t*) p); |
8e50b5a7 | 261 | if (!p) { |
968d3d24 LP |
262 | freeaddrinfo(ai); |
263 | return -ENOBUFS; | |
e963e3ad DB |
264 | } |
265 | } | |
266 | } | |
267 | ||
268 | if (ai) | |
269 | freeaddrinfo(ai); | |
270 | ||
968d3d24 LP |
271 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(AddrInfoResponse) }; |
272 | iov[1] = (struct iovec) { .iov_base = &buffer, .iov_len = resp.header.length - sizeof(AddrInfoResponse) }; | |
273 | ||
274 | mh.msg_iov = iov; | |
275 | mh.msg_iovlen = ELEMENTSOF(iov); | |
276 | ||
277 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) | |
278 | return -errno; | |
279 | ||
280 | return 0; | |
e963e3ad DB |
281 | } |
282 | ||
968d3d24 LP |
283 | static int send_nameinfo_reply( |
284 | int out_fd, | |
285 | unsigned id, | |
286 | int ret, | |
287 | const char *host, | |
288 | const char *serv, | |
289 | int _errno, | |
290 | int _h_errno) { | |
291 | ||
93f1bcf4 LP |
292 | NameInfoResponse resp = { |
293 | .header.type = RESPONSE_NAMEINFO, | |
294 | .header.id = id, | |
295 | .ret = ret, | |
296 | ._errno = _errno, | |
297 | ._h_errno = _h_errno, | |
298 | }; | |
299 | ||
968d3d24 LP |
300 | struct msghdr mh = {}; |
301 | struct iovec iov[3]; | |
e963e3ad | 302 | size_t hl, sl; |
e963e3ad DB |
303 | |
304 | assert(out_fd >= 0); | |
305 | ||
306 | sl = serv ? strlen(serv)+1 : 0; | |
307 | hl = host ? strlen(host)+1 : 0; | |
308 | ||
968d3d24 | 309 | resp.header.length = sizeof(NameInfoResponse) + hl + sl; |
968d3d24 LP |
310 | resp.hostlen = hl; |
311 | resp.servlen = sl; | |
e963e3ad | 312 | |
968d3d24 LP |
313 | iov[0] = (struct iovec) { .iov_base = &resp, .iov_len = sizeof(NameInfoResponse) }; |
314 | iov[1] = (struct iovec) { .iov_base = (void*) host, .iov_len = hl }; | |
315 | iov[2] = (struct iovec) { .iov_base = (void*) serv, .iov_len = sl }; | |
e963e3ad | 316 | |
968d3d24 LP |
317 | mh.msg_iov = iov; |
318 | mh.msg_iovlen = ELEMENTSOF(iov); | |
e963e3ad | 319 | |
968d3d24 LP |
320 | if (sendmsg(out_fd, &mh, MSG_NOSIGNAL) < 0) |
321 | return -errno; | |
e963e3ad | 322 | |
968d3d24 | 323 | return 0; |
e963e3ad DB |
324 | } |
325 | ||
5599e866 DB |
326 | static int handle_request(int out_fd, const Packet *packet, size_t length) { |
327 | const RHeader *req; | |
968d3d24 | 328 | |
e963e3ad | 329 | assert(out_fd >= 0); |
968d3d24 | 330 | assert(packet); |
e963e3ad DB |
331 | |
332 | req = &packet->rheader; | |
968d3d24 | 333 | |
5599e866 | 334 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
335 | assert(length == req->length); |
336 | ||
337 | switch (req->type) { | |
968d3d24 | 338 | |
e963e3ad | 339 | case REQUEST_ADDRINFO: { |
5599e866 | 340 | const AddrInfoRequest *ai_req = &packet->addrinfo_request; |
968d3d24 | 341 | struct addrinfo hints = {}, *result = NULL; |
e963e3ad DB |
342 | const char *node, *service; |
343 | int ret; | |
344 | ||
5599e866 DB |
345 | assert(length >= sizeof(AddrInfoRequest)); |
346 | assert(length == sizeof(AddrInfoRequest) + ai_req->node_len + ai_req->service_len); | |
e963e3ad | 347 | |
968d3d24 LP |
348 | hints.ai_flags = ai_req->ai_flags; |
349 | hints.ai_family = ai_req->ai_family; | |
350 | hints.ai_socktype = ai_req->ai_socktype; | |
351 | hints.ai_protocol = ai_req->ai_protocol; | |
e963e3ad | 352 | |
5599e866 DB |
353 | node = ai_req->node_len ? (const char*) ai_req + sizeof(AddrInfoRequest) : NULL; |
354 | service = ai_req->service_len ? (const char*) ai_req + sizeof(AddrInfoRequest) + ai_req->node_len : NULL; | |
e963e3ad | 355 | |
968d3d24 LP |
356 | ret = getaddrinfo( |
357 | node, service, | |
358 | ai_req->hints_valid ? &hints : NULL, | |
e963e3ad DB |
359 | &result); |
360 | ||
361 | /* send_addrinfo_reply() frees result */ | |
362 | return send_addrinfo_reply(out_fd, req->id, ret, result, errno, h_errno); | |
363 | } | |
364 | ||
365 | case REQUEST_NAMEINFO: { | |
5599e866 | 366 | const NameInfoRequest *ni_req = &packet->nameinfo_request; |
e963e3ad | 367 | char hostbuf[NI_MAXHOST], servbuf[NI_MAXSERV]; |
968d3d24 LP |
368 | union sockaddr_union sa; |
369 | int ret; | |
e963e3ad | 370 | |
5599e866 DB |
371 | assert(length >= sizeof(NameInfoRequest)); |
372 | assert(length == sizeof(NameInfoRequest) + ni_req->sockaddr_len); | |
968d3d24 | 373 | assert(sizeof(sa) >= ni_req->sockaddr_len); |
e963e3ad | 374 | |
5599e866 | 375 | memcpy(&sa, (const uint8_t *) ni_req + sizeof(NameInfoRequest), ni_req->sockaddr_len); |
e963e3ad | 376 | |
968d3d24 | 377 | ret = getnameinfo(&sa.sa, ni_req->sockaddr_len, |
e963e3ad DB |
378 | ni_req->gethost ? hostbuf : NULL, ni_req->gethost ? sizeof(hostbuf) : 0, |
379 | ni_req->getserv ? servbuf : NULL, ni_req->getserv ? sizeof(servbuf) : 0, | |
380 | ni_req->flags); | |
381 | ||
382 | return send_nameinfo_reply(out_fd, req->id, ret, | |
383 | ret == 0 && ni_req->gethost ? hostbuf : NULL, | |
384 | ret == 0 && ni_req->getserv ? servbuf : NULL, | |
385 | errno, h_errno); | |
386 | } | |
387 | ||
e963e3ad DB |
388 | case REQUEST_TERMINATE: |
389 | /* Quit */ | |
968d3d24 | 390 | return -ECONNRESET; |
e963e3ad DB |
391 | |
392 | default: | |
968d3d24 | 393 | assert_not_reached("Unknown request"); |
e963e3ad DB |
394 | } |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | static void* thread_worker(void *p) { | |
4f809256 | 400 | sd_resolve *resolve = p; |
e963e3ad DB |
401 | sigset_t fullset; |
402 | ||
403 | /* No signals in this thread please */ | |
968d3d24 LP |
404 | assert_se(sigfillset(&fullset) == 0); |
405 | assert_se(pthread_sigmask(SIG_BLOCK, &fullset, NULL) == 0); | |
406 | ||
407 | /* Assign a pretty name to this thread */ | |
408 | prctl(PR_SET_NAME, (unsigned long) "sd-resolve"); | |
e963e3ad | 409 | |
3bedba4a | 410 | while (!resolve->dead) { |
968d3d24 LP |
411 | union { |
412 | Packet packet; | |
413 | uint8_t space[BUFSIZE]; | |
414 | } buf; | |
e963e3ad DB |
415 | ssize_t length; |
416 | ||
968d3d24 LP |
417 | length = recv(resolve->fds[REQUEST_RECV_FD], &buf, sizeof(buf), 0); |
418 | if (length < 0) { | |
419 | if (errno == EINTR) | |
e963e3ad | 420 | continue; |
968d3d24 | 421 | |
e963e3ad DB |
422 | break; |
423 | } | |
968d3d24 LP |
424 | if (length == 0) |
425 | break; | |
e963e3ad | 426 | |
3bedba4a | 427 | if (resolve->dead) |
e963e3ad DB |
428 | break; |
429 | ||
968d3d24 | 430 | if (handle_request(resolve->fds[RESPONSE_SEND_FD], &buf.packet, (size_t) length) < 0) |
e963e3ad DB |
431 | break; |
432 | } | |
433 | ||
3bedba4a | 434 | send_died(resolve->fds[RESPONSE_SEND_FD]); |
e963e3ad DB |
435 | |
436 | return NULL; | |
437 | } | |
438 | ||
968d3d24 LP |
439 | static int start_threads(sd_resolve *resolve, unsigned extra) { |
440 | unsigned n; | |
441 | int r; | |
e963e3ad | 442 | |
96c76ac4 | 443 | n = resolve->n_outstanding + extra; |
93f1bcf4 | 444 | n = CLAMP(n, WORKERS_MIN, WORKERS_MAX); |
e963e3ad | 445 | |
968d3d24 LP |
446 | while (resolve->n_valid_workers < n) { |
447 | ||
448 | r = pthread_create(&resolve->workers[resolve->n_valid_workers], NULL, thread_worker, resolve); | |
449 | if (r != 0) | |
450 | return -r; | |
451 | ||
452 | resolve->n_valid_workers ++; | |
e963e3ad DB |
453 | } |
454 | ||
968d3d24 LP |
455 | return 0; |
456 | } | |
457 | ||
458 | static bool resolve_pid_changed(sd_resolve *r) { | |
459 | assert(r); | |
460 | ||
461 | /* We don't support people creating a resolver and keeping it | |
462 | * around after fork(). Let's complain. */ | |
463 | ||
464 | return r->original_pid != getpid(); | |
465 | } | |
e963e3ad | 466 | |
968d3d24 LP |
467 | _public_ int sd_resolve_new(sd_resolve **ret) { |
468 | sd_resolve *resolve = NULL; | |
469 | int i, r; | |
470 | ||
471 | assert_return(ret, -EINVAL); | |
472 | ||
473 | resolve = new0(sd_resolve, 1); | |
474 | if (!resolve) | |
475 | return -ENOMEM; | |
476 | ||
93f1bcf4 LP |
477 | resolve->n_ref = 1; |
478 | resolve->original_pid = getpid(); | |
479 | ||
968d3d24 | 480 | for (i = 0; i < _FD_MAX; i++) |
3bedba4a | 481 | resolve->fds[i] = -1; |
e963e3ad | 482 | |
968d3d24 LP |
483 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + REQUEST_RECV_FD); |
484 | if (r < 0) { | |
485 | r = -errno; | |
8a6233fb | 486 | goto fail; |
968d3d24 | 487 | } |
e963e3ad | 488 | |
968d3d24 LP |
489 | r = socketpair(PF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, resolve->fds + RESPONSE_RECV_FD); |
490 | if (r < 0) { | |
491 | r = -errno; | |
8a6233fb | 492 | goto fail; |
e963e3ad DB |
493 | } |
494 | ||
968d3d24 LP |
495 | fd_inc_sndbuf(resolve->fds[REQUEST_SEND_FD], QUERIES_MAX * BUFSIZE); |
496 | fd_inc_rcvbuf(resolve->fds[REQUEST_RECV_FD], QUERIES_MAX * BUFSIZE); | |
497 | fd_inc_sndbuf(resolve->fds[RESPONSE_SEND_FD], QUERIES_MAX * BUFSIZE); | |
498 | fd_inc_rcvbuf(resolve->fds[RESPONSE_RECV_FD], QUERIES_MAX * BUFSIZE); | |
e963e3ad | 499 | |
3bedba4a | 500 | fd_nonblock(resolve->fds[RESPONSE_RECV_FD], true); |
e963e3ad | 501 | |
968d3d24 LP |
502 | *ret = resolve; |
503 | return 0; | |
e963e3ad DB |
504 | |
505 | fail: | |
93f1bcf4 | 506 | sd_resolve_unref(resolve); |
968d3d24 | 507 | return r; |
e963e3ad DB |
508 | } |
509 | ||
93f1bcf4 LP |
510 | _public_ int sd_resolve_default(sd_resolve **ret) { |
511 | ||
512 | static thread_local sd_resolve *default_resolve = NULL; | |
513 | sd_resolve *e = NULL; | |
514 | int r; | |
515 | ||
516 | if (!ret) | |
517 | return !!default_resolve; | |
518 | ||
519 | if (default_resolve) { | |
520 | *ret = sd_resolve_ref(default_resolve); | |
521 | return 0; | |
522 | } | |
523 | ||
524 | r = sd_resolve_new(&e); | |
525 | if (r < 0) | |
526 | return r; | |
527 | ||
528 | e->default_resolve_ptr = &default_resolve; | |
529 | e->tid = gettid(); | |
530 | default_resolve = e; | |
531 | ||
532 | *ret = e; | |
533 | return 1; | |
534 | } | |
535 | ||
536 | _public_ int sd_resolve_get_tid(sd_resolve *resolve, pid_t *tid) { | |
537 | assert_return(resolve, -EINVAL); | |
538 | assert_return(tid, -EINVAL); | |
539 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
540 | ||
541 | if (resolve->tid != 0) { | |
542 | *tid = resolve->tid; | |
543 | return 0; | |
544 | } | |
545 | ||
546 | if (resolve->event) | |
547 | return sd_event_get_tid(resolve->event, tid); | |
548 | ||
549 | return -ENXIO; | |
550 | } | |
e963e3ad | 551 | |
93f1bcf4 LP |
552 | static void resolve_free(sd_resolve *resolve) { |
553 | PROTECT_ERRNO; | |
4a134c49 | 554 | sd_resolve_query *q; |
968d3d24 | 555 | unsigned i; |
e963e3ad | 556 | |
93f1bcf4 LP |
557 | assert(resolve); |
558 | ||
4a134c49 LP |
559 | while ((q = resolve->queries)) { |
560 | assert(q->floating); | |
561 | resolve_query_disconnect(q); | |
562 | sd_resolve_query_unref(q); | |
563 | } | |
564 | ||
93f1bcf4 LP |
565 | if (resolve->default_resolve_ptr) |
566 | *(resolve->default_resolve_ptr) = NULL; | |
968d3d24 LP |
567 | |
568 | resolve->dead = true; | |
e963e3ad | 569 | |
93f1bcf4 LP |
570 | sd_resolve_detach_event(resolve); |
571 | ||
3bedba4a | 572 | if (resolve->fds[REQUEST_SEND_FD] >= 0) { |
e963e3ad | 573 | |
968d3d24 LP |
574 | RHeader req = { |
575 | .type = REQUEST_TERMINATE, | |
576 | .length = sizeof(req) | |
577 | }; | |
e963e3ad DB |
578 | |
579 | /* Send one termination packet for each worker */ | |
968d3d24 | 580 | for (i = 0; i < resolve->n_valid_workers; i++) |
e62d9b81 | 581 | (void) send(resolve->fds[REQUEST_SEND_FD], &req, req.length, MSG_NOSIGNAL); |
e963e3ad DB |
582 | } |
583 | ||
584 | /* Now terminate them and wait until they are gone. */ | |
968d3d24 | 585 | for (i = 0; i < resolve->n_valid_workers; i++) { |
e963e3ad | 586 | for (;;) { |
968d3d24 | 587 | if (pthread_join(resolve->workers[i], NULL) != EINTR) |
e963e3ad DB |
588 | break; |
589 | } | |
590 | } | |
591 | ||
592 | /* Close all communication channels */ | |
968d3d24 | 593 | for (i = 0; i < _FD_MAX; i++) |
03e334a1 | 594 | safe_close(resolve->fds[i]); |
e963e3ad | 595 | |
3bedba4a | 596 | free(resolve); |
93f1bcf4 LP |
597 | } |
598 | ||
599 | _public_ sd_resolve* sd_resolve_ref(sd_resolve *resolve) { | |
600 | assert_return(resolve, NULL); | |
601 | ||
602 | assert(resolve->n_ref >= 1); | |
603 | resolve->n_ref++; | |
604 | ||
605 | return resolve; | |
606 | } | |
607 | ||
608 | _public_ sd_resolve* sd_resolve_unref(sd_resolve *resolve) { | |
609 | ||
610 | if (!resolve) | |
611 | return NULL; | |
612 | ||
613 | assert(resolve->n_ref >= 1); | |
614 | resolve->n_ref--; | |
615 | ||
616 | if (resolve->n_ref <= 0) | |
617 | resolve_free(resolve); | |
618 | ||
968d3d24 | 619 | return NULL; |
e963e3ad DB |
620 | } |
621 | ||
968d3d24 LP |
622 | _public_ int sd_resolve_get_fd(sd_resolve *resolve) { |
623 | assert_return(resolve, -EINVAL); | |
624 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 625 | |
3bedba4a | 626 | return resolve->fds[RESPONSE_RECV_FD]; |
e963e3ad DB |
627 | } |
628 | ||
968d3d24 LP |
629 | _public_ int sd_resolve_get_events(sd_resolve *resolve) { |
630 | assert_return(resolve, -EINVAL); | |
631 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
632 | ||
633 | return resolve->n_queries > resolve->n_done ? POLLIN : 0; | |
634 | } | |
635 | ||
636 | _public_ int sd_resolve_get_timeout(sd_resolve *resolve, uint64_t *usec) { | |
637 | assert_return(resolve, -EINVAL); | |
638 | assert_return(usec, -EINVAL); | |
639 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
640 | ||
641 | *usec = (uint64_t) -1; | |
642 | return 0; | |
643 | } | |
644 | ||
4f809256 DB |
645 | static sd_resolve_query *lookup_query(sd_resolve *resolve, unsigned id) { |
646 | sd_resolve_query *q; | |
968d3d24 | 647 | |
3bedba4a | 648 | assert(resolve); |
e963e3ad | 649 | |
4a134c49 | 650 | q = resolve->query_array[id % QUERIES_MAX]; |
8e50b5a7 | 651 | if (q) |
e963e3ad DB |
652 | if (q->id == id) |
653 | return q; | |
654 | ||
655 | return NULL; | |
656 | } | |
657 | ||
93f1bcf4 LP |
658 | static int complete_query(sd_resolve *resolve, sd_resolve_query *q) { |
659 | int r; | |
660 | ||
e963e3ad DB |
661 | assert(q); |
662 | assert(!q->done); | |
93f1bcf4 | 663 | assert(q->resolve == resolve); |
e963e3ad | 664 | |
968d3d24 | 665 | q->done = true; |
93f1bcf4 LP |
666 | resolve->n_done ++; |
667 | ||
73dec319 | 668 | resolve->current = sd_resolve_query_ref(q); |
93f1bcf4 LP |
669 | |
670 | switch (q->type) { | |
671 | ||
672 | case REQUEST_ADDRINFO: | |
673 | r = getaddrinfo_done(q); | |
674 | break; | |
675 | ||
676 | case REQUEST_NAMEINFO: | |
677 | r = getnameinfo_done(q); | |
678 | break; | |
679 | ||
93f1bcf4 LP |
680 | default: |
681 | assert_not_reached("Cannot complete unknown query type"); | |
682 | } | |
683 | ||
502fe44e | 684 | resolve->current = NULL; |
93f1bcf4 | 685 | |
4a134c49 LP |
686 | if (q->floating) { |
687 | resolve_query_disconnect(q); | |
f2e2415d | 688 | sd_resolve_query_unref(q); |
4a134c49 LP |
689 | } |
690 | ||
502fe44e LP |
691 | sd_resolve_query_unref(q); |
692 | ||
93f1bcf4 | 693 | return r; |
e963e3ad DB |
694 | } |
695 | ||
968d3d24 | 696 | static int unserialize_addrinfo(const void **p, size_t *length, struct addrinfo **ret_ai) { |
5599e866 | 697 | AddrInfoSerialization s; |
e963e3ad DB |
698 | size_t l; |
699 | struct addrinfo *ai; | |
968d3d24 | 700 | |
e963e3ad | 701 | assert(p); |
968d3d24 | 702 | assert(*p); |
e963e3ad DB |
703 | assert(ret_ai); |
704 | assert(length); | |
705 | ||
5599e866 | 706 | if (*length < sizeof(AddrInfoSerialization)) |
968d3d24 | 707 | return -EBADMSG; |
e963e3ad | 708 | |
968d3d24 | 709 | memcpy(&s, *p, sizeof(s)); |
e963e3ad | 710 | |
5599e866 | 711 | l = sizeof(AddrInfoSerialization) + s.ai_addrlen + s.canonname_len; |
e963e3ad | 712 | if (*length < l) |
968d3d24 | 713 | return -EBADMSG; |
e963e3ad | 714 | |
968d3d24 | 715 | ai = new0(struct addrinfo, 1); |
8e50b5a7 | 716 | if (!ai) |
968d3d24 | 717 | return -ENOMEM; |
e963e3ad DB |
718 | |
719 | ai->ai_flags = s.ai_flags; | |
720 | ai->ai_family = s.ai_family; | |
721 | ai->ai_socktype = s.ai_socktype; | |
722 | ai->ai_protocol = s.ai_protocol; | |
723 | ai->ai_addrlen = s.ai_addrlen; | |
724 | ||
968d3d24 LP |
725 | if (s.ai_addrlen > 0) { |
726 | ai->ai_addr = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization), s.ai_addrlen); | |
727 | if (!ai->ai_addr) { | |
728 | free(ai); | |
729 | return -ENOMEM; | |
730 | } | |
731 | } | |
e963e3ad | 732 | |
968d3d24 LP |
733 | if (s.canonname_len > 0) { |
734 | ai->ai_canonname = memdup((const uint8_t*) *p + sizeof(AddrInfoSerialization) + s.ai_addrlen, s.canonname_len); | |
735 | if (!ai->ai_canonname) { | |
736 | free(ai->ai_addr); | |
737 | free(ai); | |
738 | return -ENOMEM; | |
739 | } | |
740 | } | |
e963e3ad DB |
741 | |
742 | *length -= l; | |
743 | *ret_ai = ai; | |
968d3d24 | 744 | *p = ((const uint8_t*) *p) + l; |
e963e3ad | 745 | |
968d3d24 | 746 | return 0; |
e963e3ad DB |
747 | } |
748 | ||
5599e866 DB |
749 | static int handle_response(sd_resolve *resolve, const Packet *packet, size_t length) { |
750 | const RHeader *resp; | |
4f809256 | 751 | sd_resolve_query *q; |
968d3d24 | 752 | int r; |
e963e3ad | 753 | |
3bedba4a | 754 | assert(resolve); |
e963e3ad DB |
755 | |
756 | resp = &packet->rheader; | |
757 | assert(resp); | |
5599e866 | 758 | assert(length >= sizeof(RHeader)); |
e963e3ad DB |
759 | assert(length == resp->length); |
760 | ||
761 | if (resp->type == RESPONSE_DIED) { | |
968d3d24 | 762 | resolve->dead = true; |
e963e3ad DB |
763 | return 0; |
764 | } | |
765 | ||
96c76ac4 LP |
766 | assert(resolve->n_outstanding > 0); |
767 | resolve->n_outstanding--; | |
768 | ||
3bedba4a | 769 | q = lookup_query(resolve, resp->id); |
8e50b5a7 | 770 | if (!q) |
e963e3ad DB |
771 | return 0; |
772 | ||
773 | switch (resp->type) { | |
968d3d24 | 774 | |
e963e3ad | 775 | case RESPONSE_ADDRINFO: { |
5599e866 | 776 | const AddrInfoResponse *ai_resp = &packet->addrinfo_response; |
e963e3ad DB |
777 | const void *p; |
778 | size_t l; | |
779 | struct addrinfo *prev = NULL; | |
780 | ||
5599e866 | 781 | assert(length >= sizeof(AddrInfoResponse)); |
e963e3ad DB |
782 | assert(q->type == REQUEST_ADDRINFO); |
783 | ||
784 | q->ret = ai_resp->ret; | |
785 | q->_errno = ai_resp->_errno; | |
786 | q->_h_errno = ai_resp->_h_errno; | |
968d3d24 | 787 | |
5599e866 DB |
788 | l = length - sizeof(AddrInfoResponse); |
789 | p = (const uint8_t*) resp + sizeof(AddrInfoResponse); | |
e963e3ad DB |
790 | |
791 | while (l > 0 && p) { | |
792 | struct addrinfo *ai = NULL; | |
e963e3ad | 793 | |
968d3d24 LP |
794 | r = unserialize_addrinfo(&p, &l, &ai); |
795 | if (r < 0) { | |
796 | q->ret = EAI_SYSTEM; | |
797 | q->_errno = -r; | |
798 | q->_h_errno = 0; | |
799 | freeaddrinfo(q->addrinfo); | |
800 | q->addrinfo = NULL; | |
e963e3ad DB |
801 | break; |
802 | } | |
803 | ||
804 | if (prev) | |
805 | prev->ai_next = ai; | |
806 | else | |
807 | q->addrinfo = ai; | |
808 | ||
809 | prev = ai; | |
810 | } | |
811 | ||
93f1bcf4 | 812 | return complete_query(resolve, q); |
e963e3ad DB |
813 | } |
814 | ||
815 | case RESPONSE_NAMEINFO: { | |
5599e866 | 816 | const NameInfoResponse *ni_resp = &packet->nameinfo_response; |
e963e3ad | 817 | |
5599e866 | 818 | assert(length >= sizeof(NameInfoResponse)); |
e963e3ad DB |
819 | assert(q->type == REQUEST_NAMEINFO); |
820 | ||
821 | q->ret = ni_resp->ret; | |
822 | q->_errno = ni_resp->_errno; | |
823 | q->_h_errno = ni_resp->_h_errno; | |
824 | ||
968d3d24 LP |
825 | if (ni_resp->hostlen > 0) { |
826 | q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1); | |
827 | if (!q->host) { | |
e963e3ad | 828 | q->ret = EAI_MEMORY; |
968d3d24 LP |
829 | q->_errno = ENOMEM; |
830 | q->_h_errno = 0; | |
831 | } | |
832 | } | |
e963e3ad | 833 | |
968d3d24 LP |
834 | if (ni_resp->servlen > 0) { |
835 | q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1); | |
836 | if (!q->serv) { | |
e963e3ad | 837 | q->ret = EAI_MEMORY; |
968d3d24 LP |
838 | q->_errno = ENOMEM; |
839 | q->_h_errno = 0; | |
840 | } | |
841 | } | |
e963e3ad | 842 | |
93f1bcf4 | 843 | return complete_query(resolve, q); |
e963e3ad DB |
844 | } |
845 | ||
e963e3ad | 846 | default: |
93f1bcf4 | 847 | return 0; |
e963e3ad | 848 | } |
e963e3ad DB |
849 | } |
850 | ||
968d3d24 | 851 | _public_ int sd_resolve_process(sd_resolve *resolve) { |
93f1bcf4 LP |
852 | RESOLVE_DONT_DESTROY(resolve); |
853 | ||
854 | union { | |
855 | Packet packet; | |
856 | uint8_t space[BUFSIZE]; | |
857 | } buf; | |
858 | ssize_t l; | |
859 | int r; | |
968d3d24 LP |
860 | |
861 | assert_return(resolve, -EINVAL); | |
862 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 863 | |
93f1bcf4 LP |
864 | /* We don't allow recursively invoking sd_resolve_process(). */ |
865 | assert_return(!resolve->current, -EBUSY); | |
e963e3ad | 866 | |
93f1bcf4 LP |
867 | l = recv(resolve->fds[RESPONSE_RECV_FD], &buf, sizeof(buf), 0); |
868 | if (l < 0) { | |
869 | if (errno == EAGAIN) | |
870 | return 0; | |
968d3d24 | 871 | |
93f1bcf4 LP |
872 | return -errno; |
873 | } | |
874 | if (l == 0) | |
875 | return -ECONNREFUSED; | |
e963e3ad | 876 | |
93f1bcf4 LP |
877 | r = handle_response(resolve, &buf.packet, (size_t) l); |
878 | if (r < 0) | |
879 | return r; | |
e963e3ad | 880 | |
93f1bcf4 | 881 | return 1; |
968d3d24 | 882 | } |
e963e3ad | 883 | |
968d3d24 LP |
884 | _public_ int sd_resolve_wait(sd_resolve *resolve, uint64_t timeout_usec) { |
885 | int r; | |
e963e3ad | 886 | |
968d3d24 LP |
887 | assert_return(resolve, -EINVAL); |
888 | assert_return(!resolve_pid_changed(resolve), -ECHILD); | |
e963e3ad | 889 | |
93f1bcf4 | 890 | if (resolve->n_done >= resolve->n_queries) |
968d3d24 | 891 | return 0; |
e963e3ad | 892 | |
968d3d24 LP |
893 | do { |
894 | r = fd_wait_for_event(resolve->fds[RESPONSE_RECV_FD], POLLIN, timeout_usec); | |
895 | } while (r == -EINTR); | |
e963e3ad | 896 | |
968d3d24 LP |
897 | if (r < 0) |
898 | return r; | |
e963e3ad | 899 | |
968d3d24 | 900 | return sd_resolve_process(resolve); |
e963e3ad DB |
901 | } |
902 | ||
4a134c49 | 903 | static int alloc_query(sd_resolve *resolve, bool floating, sd_resolve_query **_q) { |
4f809256 | 904 | sd_resolve_query *q; |
968d3d24 LP |
905 | int r; |
906 | ||
3bedba4a | 907 | assert(resolve); |
968d3d24 | 908 | assert(_q); |
e963e3ad | 909 | |
968d3d24 LP |
910 | if (resolve->n_queries >= QUERIES_MAX) |
911 | return -ENOBUFS; | |
912 | ||
913 | r = start_threads(resolve, 1); | |
914 | if (r < 0) | |
915 | return r; | |
e963e3ad | 916 | |
85529c81 | 917 | while (resolve->query_array[resolve->current_id % QUERIES_MAX]) |
3bedba4a | 918 | resolve->current_id++; |
e963e3ad | 919 | |
85529c81 | 920 | q = resolve->query_array[resolve->current_id % QUERIES_MAX] = new0(sd_resolve_query, 1); |
968d3d24 LP |
921 | if (!q) |
922 | return -ENOMEM; | |
e963e3ad | 923 | |
93f1bcf4 | 924 | q->n_ref = 1; |
4a134c49 LP |
925 | q->resolve = resolve; |
926 | q->floating = floating; | |
85529c81 | 927 | q->id = resolve->current_id++; |
968d3d24 | 928 | |
4a134c49 LP |
929 | if (!floating) |
930 | sd_resolve_ref(resolve); | |
931 | ||
932 | LIST_PREPEND(queries, resolve->queries, q); | |
93f1bcf4 LP |
933 | resolve->n_queries++; |
934 | ||
968d3d24 LP |
935 | *_q = q; |
936 | return 0; | |
e963e3ad DB |
937 | } |
938 | ||
968d3d24 LP |
939 | _public_ int sd_resolve_getaddrinfo( |
940 | sd_resolve *resolve, | |
151b9b96 | 941 | sd_resolve_query **_q, |
93f1bcf4 LP |
942 | const char *node, const char *service, |
943 | const struct addrinfo *hints, | |
944 | sd_resolve_getaddrinfo_handler_t callback, void *userdata) { | |
968d3d24 LP |
945 | |
946 | AddrInfoRequest req = {}; | |
947 | struct msghdr mh = {}; | |
948 | struct iovec iov[3]; | |
4f809256 | 949 | sd_resolve_query *q; |
968d3d24 | 950 | int r; |
e963e3ad | 951 | |
968d3d24 | 952 | assert_return(resolve, -EINVAL); |
93f1bcf4 LP |
953 | assert_return(node || service, -EINVAL); |
954 | assert_return(callback, -EINVAL); | |
968d3d24 | 955 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 956 | |
4a134c49 | 957 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
958 | if (r < 0) |
959 | return r; | |
e963e3ad | 960 | |
93f1bcf4 LP |
961 | q->type = REQUEST_ADDRINFO; |
962 | q->getaddrinfo_handler = callback; | |
963 | q->userdata = userdata; | |
964 | ||
968d3d24 LP |
965 | req.node_len = node ? strlen(node)+1 : 0; |
966 | req.service_len = service ? strlen(service)+1 : 0; | |
e963e3ad | 967 | |
968d3d24 | 968 | req.header.id = q->id; |
93f1bcf4 | 969 | req.header.type = REQUEST_ADDRINFO; |
968d3d24 | 970 | req.header.length = sizeof(AddrInfoRequest) + req.node_len + req.service_len; |
e963e3ad | 971 | |
968d3d24 LP |
972 | if (hints) { |
973 | req.hints_valid = true; | |
974 | req.ai_flags = hints->ai_flags; | |
975 | req.ai_family = hints->ai_family; | |
976 | req.ai_socktype = hints->ai_socktype; | |
977 | req.ai_protocol = hints->ai_protocol; | |
e963e3ad DB |
978 | } |
979 | ||
968d3d24 | 980 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(AddrInfoRequest) }; |
e963e3ad | 981 | if (node) |
968d3d24 | 982 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) node, .iov_len = req.node_len }; |
e963e3ad | 983 | if (service) |
968d3d24 | 984 | iov[mh.msg_iovlen++] = (struct iovec) { .iov_base = (void*) service, .iov_len = req.service_len }; |
968d3d24 | 985 | mh.msg_iov = iov; |
e963e3ad | 986 | |
968d3d24 | 987 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 988 | sd_resolve_query_unref(q); |
968d3d24 LP |
989 | return -errno; |
990 | } | |
e963e3ad | 991 | |
96c76ac4 LP |
992 | resolve->n_outstanding++; |
993 | ||
4a134c49 LP |
994 | if (_q) |
995 | *_q = q; | |
996 | ||
968d3d24 | 997 | return 0; |
e963e3ad DB |
998 | } |
999 | ||
93f1bcf4 LP |
1000 | static int getaddrinfo_done(sd_resolve_query* q) { |
1001 | assert(q); | |
1002 | assert(q->done); | |
1003 | assert(q->getaddrinfo_handler); | |
e963e3ad | 1004 | |
93f1bcf4 LP |
1005 | errno = q->_errno; |
1006 | h_errno = q->_h_errno; | |
e963e3ad | 1007 | |
93f1bcf4 | 1008 | return q->getaddrinfo_handler(q, q->ret, q->addrinfo, q->userdata); |
e963e3ad DB |
1009 | } |
1010 | ||
968d3d24 LP |
1011 | _public_ int sd_resolve_getnameinfo( |
1012 | sd_resolve *resolve, | |
151b9b96 | 1013 | sd_resolve_query**_q, |
968d3d24 LP |
1014 | const struct sockaddr *sa, socklen_t salen, |
1015 | int flags, | |
93f1bcf4 LP |
1016 | uint64_t get, |
1017 | sd_resolve_getnameinfo_handler_t callback, | |
1018 | void *userdata) { | |
e963e3ad | 1019 | |
968d3d24 LP |
1020 | NameInfoRequest req = {}; |
1021 | struct msghdr mh = {}; | |
1022 | struct iovec iov[2]; | |
1023 | sd_resolve_query *q; | |
1024 | int r; | |
e963e3ad | 1025 | |
968d3d24 LP |
1026 | assert_return(resolve, -EINVAL); |
1027 | assert_return(sa, -EINVAL); | |
1028 | assert_return(salen >= sizeof(struct sockaddr), -EINVAL); | |
1029 | assert_return(salen <= sizeof(union sockaddr_union), -EINVAL); | |
93f1bcf4 LP |
1030 | assert_return((get & ~SD_RESOLVE_GET_BOTH) == 0, -EINVAL); |
1031 | assert_return(callback, -EINVAL); | |
968d3d24 | 1032 | assert_return(!resolve_pid_changed(resolve), -ECHILD); |
e963e3ad | 1033 | |
4a134c49 | 1034 | r = alloc_query(resolve, !_q, &q); |
968d3d24 LP |
1035 | if (r < 0) |
1036 | return r; | |
e963e3ad | 1037 | |
93f1bcf4 LP |
1038 | q->type = REQUEST_NAMEINFO; |
1039 | q->getnameinfo_handler = callback; | |
1040 | q->userdata = userdata; | |
1041 | ||
968d3d24 | 1042 | req.header.id = q->id; |
93f1bcf4 | 1043 | req.header.type = REQUEST_NAMEINFO; |
968d3d24 | 1044 | req.header.length = sizeof(NameInfoRequest) + salen; |
e963e3ad | 1045 | |
968d3d24 LP |
1046 | req.flags = flags; |
1047 | req.sockaddr_len = salen; | |
93f1bcf4 LP |
1048 | req.gethost = !!(get & SD_RESOLVE_GET_HOST); |
1049 | req.getserv = !!(get & SD_RESOLVE_GET_SERVICE); | |
e963e3ad | 1050 | |
968d3d24 LP |
1051 | iov[0] = (struct iovec) { .iov_base = &req, .iov_len = sizeof(NameInfoRequest) }; |
1052 | iov[1] = (struct iovec) { .iov_base = (void*) sa, .iov_len = salen }; | |
e963e3ad | 1053 | |
968d3d24 LP |
1054 | mh.msg_iov = iov; |
1055 | mh.msg_iovlen = 2; | |
e963e3ad | 1056 | |
968d3d24 | 1057 | if (sendmsg(resolve->fds[REQUEST_SEND_FD], &mh, MSG_NOSIGNAL) < 0) { |
93f1bcf4 | 1058 | sd_resolve_query_unref(q); |
968d3d24 LP |
1059 | return -errno; |
1060 | } | |
e963e3ad | 1061 | |
96c76ac4 LP |
1062 | resolve->n_outstanding++; |
1063 | ||
4a134c49 LP |
1064 | if (_q) |
1065 | *_q = q; | |
1066 | ||
968d3d24 | 1067 | return 0; |
e963e3ad DB |
1068 | } |
1069 | ||
93f1bcf4 | 1070 | static int getnameinfo_done(sd_resolve_query *q) { |
968d3d24 | 1071 | |
93f1bcf4 LP |
1072 | assert(q); |
1073 | assert(q->done); | |
1074 | assert(q->getnameinfo_handler); | |
e963e3ad | 1075 | |
93f1bcf4 LP |
1076 | errno = q->_errno; |
1077 | h_errno= q->_h_errno; | |
e963e3ad | 1078 | |
93f1bcf4 | 1079 | return q->getnameinfo_handler(q, q->ret, q->host, q->serv, q->userdata); |
e963e3ad DB |
1080 | } |
1081 | ||
93f1bcf4 LP |
1082 | _public_ sd_resolve_query* sd_resolve_query_ref(sd_resolve_query *q) { |
1083 | assert_return(q, NULL); | |
e963e3ad | 1084 | |
93f1bcf4 LP |
1085 | assert(q->n_ref >= 1); |
1086 | q->n_ref++; | |
968d3d24 | 1087 | |
93f1bcf4 | 1088 | return q; |
e963e3ad DB |
1089 | } |
1090 | ||
93f1bcf4 LP |
1091 | static void resolve_freeaddrinfo(struct addrinfo *ai) { |
1092 | while (ai) { | |
1093 | struct addrinfo *next = ai->ai_next; | |
e963e3ad | 1094 | |
93f1bcf4 LP |
1095 | free(ai->ai_addr); |
1096 | free(ai->ai_canonname); | |
1097 | free(ai); | |
1098 | ai = next; | |
1099 | } | |
1100 | } | |
e963e3ad | 1101 | |
4a134c49 LP |
1102 | static void resolve_query_disconnect(sd_resolve_query *q) { |
1103 | sd_resolve *resolve; | |
93f1bcf4 | 1104 | unsigned i; |
e963e3ad | 1105 | |
93f1bcf4 | 1106 | assert(q); |
4a134c49 LP |
1107 | |
1108 | if (!q->resolve) | |
1109 | return; | |
1110 | ||
1111 | resolve = q->resolve; | |
1112 | assert(resolve->n_queries > 0); | |
e963e3ad | 1113 | |
968d3d24 | 1114 | if (q->done) { |
4a134c49 LP |
1115 | assert(resolve->n_done > 0); |
1116 | resolve->n_done--; | |
e963e3ad DB |
1117 | } |
1118 | ||
968d3d24 | 1119 | i = q->id % QUERIES_MAX; |
4a134c49 LP |
1120 | assert(resolve->query_array[i] == q); |
1121 | resolve->query_array[i] = NULL; | |
1122 | LIST_REMOVE(queries, resolve->queries, q); | |
1123 | resolve->n_queries--; | |
1124 | ||
1125 | q->resolve = NULL; | |
1126 | if (!q->floating) | |
1127 | sd_resolve_unref(resolve); | |
1128 | } | |
1129 | ||
1130 | static void resolve_query_free(sd_resolve_query *q) { | |
1131 | assert(q); | |
1132 | ||
1133 | resolve_query_disconnect(q); | |
e963e3ad | 1134 | |
93f1bcf4 | 1135 | resolve_freeaddrinfo(q->addrinfo); |
e963e3ad DB |
1136 | free(q->host); |
1137 | free(q->serv); | |
e963e3ad | 1138 | free(q); |
e963e3ad DB |
1139 | } |
1140 | ||
93f1bcf4 LP |
1141 | _public_ sd_resolve_query* sd_resolve_query_unref(sd_resolve_query* q) { |
1142 | if (!q) | |
1143 | return NULL; | |
e963e3ad | 1144 | |
93f1bcf4 LP |
1145 | assert(q->n_ref >= 1); |
1146 | q->n_ref--; | |
e963e3ad | 1147 | |
93f1bcf4 LP |
1148 | if (q->n_ref <= 0) |
1149 | resolve_query_free(q); | |
e963e3ad | 1150 | |
93f1bcf4 | 1151 | return NULL; |
e963e3ad DB |
1152 | } |
1153 | ||
93f1bcf4 | 1154 | _public_ int sd_resolve_query_is_done(sd_resolve_query *q) { |
968d3d24 LP |
1155 | assert_return(q, -EINVAL); |
1156 | assert_return(!resolve_pid_changed(q->resolve), -ECHILD); | |
e963e3ad DB |
1157 | |
1158 | return q->done; | |
1159 | } | |
1160 | ||
93f1bcf4 | 1161 | _public_ void* sd_resolve_query_set_userdata(sd_resolve_query *q, void *userdata) { |
968d3d24 | 1162 | void *ret; |
e963e3ad | 1163 | |
968d3d24 LP |
1164 | assert_return(q, NULL); |
1165 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1166 | ||
1167 | ret = q->userdata; | |
e963e3ad | 1168 | q->userdata = userdata; |
968d3d24 LP |
1169 | |
1170 | return ret; | |
e963e3ad DB |
1171 | } |
1172 | ||
93f1bcf4 | 1173 | _public_ void* sd_resolve_query_get_userdata(sd_resolve_query *q) { |
968d3d24 LP |
1174 | assert_return(q, NULL); |
1175 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
e963e3ad DB |
1176 | |
1177 | return q->userdata; | |
1178 | } | |
93f1bcf4 LP |
1179 | |
1180 | _public_ sd_resolve *sd_resolve_query_get_resolve(sd_resolve_query *q) { | |
1181 | assert_return(q, NULL); | |
1182 | assert_return(!resolve_pid_changed(q->resolve), NULL); | |
1183 | ||
1184 | return q->resolve; | |
1185 | } | |
1186 | ||
1187 | static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1188 | sd_resolve *resolve = userdata; | |
1189 | int r; | |
1190 | ||
1191 | assert(resolve); | |
1192 | ||
1193 | r = sd_resolve_process(resolve); | |
1194 | if (r < 0) | |
1195 | return r; | |
1196 | ||
1197 | return 1; | |
1198 | } | |
1199 | ||
1200 | _public_ int sd_resolve_attach_event(sd_resolve *resolve, sd_event *event, int priority) { | |
1201 | int r; | |
1202 | ||
1203 | assert_return(resolve, -EINVAL); | |
1204 | assert_return(!resolve->event, -EBUSY); | |
1205 | ||
1206 | assert(!resolve->event_source); | |
1207 | ||
1208 | if (event) | |
1209 | resolve->event = sd_event_ref(event); | |
1210 | else { | |
1211 | r = sd_event_default(&resolve->event); | |
1212 | if (r < 0) | |
1213 | return r; | |
1214 | } | |
1215 | ||
1216 | r = sd_event_add_io(resolve->event, &resolve->event_source, resolve->fds[RESPONSE_RECV_FD], POLLIN, io_callback, resolve); | |
1217 | if (r < 0) | |
1218 | goto fail; | |
1219 | ||
1220 | r = sd_event_source_set_priority(resolve->event_source, priority); | |
1221 | if (r < 0) | |
1222 | goto fail; | |
1223 | ||
1224 | return 0; | |
1225 | ||
1226 | fail: | |
1227 | sd_resolve_detach_event(resolve); | |
1228 | return r; | |
1229 | } | |
1230 | ||
1231 | _public_ int sd_resolve_detach_event(sd_resolve *resolve) { | |
1232 | assert_return(resolve, -EINVAL); | |
1233 | ||
1234 | if (!resolve->event) | |
1235 | return 0; | |
1236 | ||
1237 | if (resolve->event_source) { | |
1238 | sd_event_source_set_enabled(resolve->event_source, SD_EVENT_OFF); | |
1239 | resolve->event_source = sd_event_source_unref(resolve->event_source); | |
1240 | } | |
1241 | ||
1242 | resolve->event = sd_event_unref(resolve->event); | |
1243 | return 1; | |
1244 | } | |
1245 | ||
1246 | _public_ sd_event *sd_resolve_get_event(sd_resolve *resolve) { | |
1247 | assert_return(resolve, NULL); | |
1248 | ||
1249 | return resolve->event; | |
1250 | } |