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Commit | Line | Data |
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663996b3 MS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
60f067b4 JS |
4 | This file is part of systemd. |
5 | ||
663996b3 MS |
6 | Copyright 2010 Lennart Poettering |
7 | ||
60f067b4 JS |
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. | |
663996b3 | 12 | |
60f067b4 JS |
13 | systemd is distributed in the hope that it will be useful, but |
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 | ||
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 | ***/ | |
663996b3 | 21 | |
663996b3 MS |
22 | #include <sys/stat.h> |
23 | #include <sys/socket.h> | |
24 | #include <sys/un.h> | |
663996b3 MS |
25 | #include <netinet/in.h> |
26 | #include <stdlib.h> | |
27 | #include <errno.h> | |
28 | #include <unistd.h> | |
29 | #include <string.h> | |
30 | #include <stdarg.h> | |
31 | #include <stdio.h> | |
32 | #include <stddef.h> | |
33 | #include <limits.h> | |
60f067b4 | 34 | #include <mqueue.h> |
663996b3 | 35 | |
60f067b4 JS |
36 | #include "util.h" |
37 | #include "path-util.h" | |
5eef597e | 38 | #include "socket-util.h" |
663996b3 MS |
39 | #include "sd-daemon.h" |
40 | ||
60f067b4 | 41 | _public_ int sd_listen_fds(int unset_environment) { |
663996b3 | 42 | const char *e; |
60f067b4 JS |
43 | unsigned n; |
44 | int r, fd; | |
45 | pid_t pid; | |
663996b3 MS |
46 | |
47 | e = getenv("LISTEN_PID"); | |
48 | if (!e) { | |
49 | r = 0; | |
50 | goto finish; | |
51 | } | |
52 | ||
60f067b4 JS |
53 | r = parse_pid(e, &pid); |
54 | if (r < 0) | |
663996b3 | 55 | goto finish; |
663996b3 MS |
56 | |
57 | /* Is this for us? */ | |
60f067b4 | 58 | if (getpid() != pid) { |
663996b3 MS |
59 | r = 0; |
60 | goto finish; | |
61 | } | |
62 | ||
63 | e = getenv("LISTEN_FDS"); | |
64 | if (!e) { | |
65 | r = 0; | |
66 | goto finish; | |
67 | } | |
68 | ||
60f067b4 JS |
69 | r = safe_atou(e, &n); |
70 | if (r < 0) | |
663996b3 | 71 | goto finish; |
663996b3 | 72 | |
60f067b4 JS |
73 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) n; fd ++) { |
74 | r = fd_cloexec(fd, true); | |
75 | if (r < 0) | |
663996b3 | 76 | goto finish; |
663996b3 MS |
77 | } |
78 | ||
60f067b4 | 79 | r = (int) n; |
663996b3 MS |
80 | |
81 | finish: | |
82 | if (unset_environment) { | |
83 | unsetenv("LISTEN_PID"); | |
84 | unsetenv("LISTEN_FDS"); | |
85 | } | |
86 | ||
87 | return r; | |
663996b3 MS |
88 | } |
89 | ||
60f067b4 | 90 | _public_ int sd_is_fifo(int fd, const char *path) { |
663996b3 MS |
91 | struct stat st_fd; |
92 | ||
60f067b4 | 93 | assert_return(fd >= 0, -EINVAL); |
663996b3 MS |
94 | |
95 | if (fstat(fd, &st_fd) < 0) | |
96 | return -errno; | |
97 | ||
98 | if (!S_ISFIFO(st_fd.st_mode)) | |
99 | return 0; | |
100 | ||
101 | if (path) { | |
102 | struct stat st_path; | |
103 | ||
104 | if (stat(path, &st_path) < 0) { | |
105 | ||
106 | if (errno == ENOENT || errno == ENOTDIR) | |
107 | return 0; | |
108 | ||
109 | return -errno; | |
110 | } | |
111 | ||
112 | return | |
113 | st_path.st_dev == st_fd.st_dev && | |
114 | st_path.st_ino == st_fd.st_ino; | |
115 | } | |
116 | ||
117 | return 1; | |
118 | } | |
119 | ||
60f067b4 | 120 | _public_ int sd_is_special(int fd, const char *path) { |
663996b3 MS |
121 | struct stat st_fd; |
122 | ||
60f067b4 | 123 | assert_return(fd >= 0, -EINVAL); |
663996b3 MS |
124 | |
125 | if (fstat(fd, &st_fd) < 0) | |
126 | return -errno; | |
127 | ||
128 | if (!S_ISREG(st_fd.st_mode) && !S_ISCHR(st_fd.st_mode)) | |
129 | return 0; | |
130 | ||
131 | if (path) { | |
132 | struct stat st_path; | |
133 | ||
134 | if (stat(path, &st_path) < 0) { | |
135 | ||
136 | if (errno == ENOENT || errno == ENOTDIR) | |
137 | return 0; | |
138 | ||
139 | return -errno; | |
140 | } | |
141 | ||
142 | if (S_ISREG(st_fd.st_mode) && S_ISREG(st_path.st_mode)) | |
143 | return | |
144 | st_path.st_dev == st_fd.st_dev && | |
145 | st_path.st_ino == st_fd.st_ino; | |
146 | else if (S_ISCHR(st_fd.st_mode) && S_ISCHR(st_path.st_mode)) | |
147 | return st_path.st_rdev == st_fd.st_rdev; | |
148 | else | |
149 | return 0; | |
150 | } | |
151 | ||
152 | return 1; | |
153 | } | |
154 | ||
155 | static int sd_is_socket_internal(int fd, int type, int listening) { | |
156 | struct stat st_fd; | |
157 | ||
60f067b4 JS |
158 | assert_return(fd >= 0, -EINVAL); |
159 | assert_return(type >= 0, -EINVAL); | |
663996b3 MS |
160 | |
161 | if (fstat(fd, &st_fd) < 0) | |
162 | return -errno; | |
163 | ||
164 | if (!S_ISSOCK(st_fd.st_mode)) | |
165 | return 0; | |
166 | ||
167 | if (type != 0) { | |
168 | int other_type = 0; | |
169 | socklen_t l = sizeof(other_type); | |
170 | ||
171 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0) | |
172 | return -errno; | |
173 | ||
174 | if (l != sizeof(other_type)) | |
175 | return -EINVAL; | |
176 | ||
177 | if (other_type != type) | |
178 | return 0; | |
179 | } | |
180 | ||
181 | if (listening >= 0) { | |
182 | int accepting = 0; | |
183 | socklen_t l = sizeof(accepting); | |
184 | ||
185 | if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0) | |
186 | return -errno; | |
187 | ||
188 | if (l != sizeof(accepting)) | |
189 | return -EINVAL; | |
190 | ||
191 | if (!accepting != !listening) | |
192 | return 0; | |
193 | } | |
194 | ||
195 | return 1; | |
196 | } | |
197 | ||
60f067b4 | 198 | _public_ int sd_is_socket(int fd, int family, int type, int listening) { |
663996b3 MS |
199 | int r; |
200 | ||
60f067b4 JS |
201 | assert_return(fd >= 0, -EINVAL); |
202 | assert_return(family >= 0, -EINVAL); | |
663996b3 MS |
203 | |
204 | r = sd_is_socket_internal(fd, type, listening); | |
205 | if (r <= 0) | |
206 | return r; | |
207 | ||
208 | if (family > 0) { | |
209 | union sockaddr_union sockaddr = {}; | |
210 | socklen_t l = sizeof(sockaddr); | |
211 | ||
212 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
213 | return -errno; | |
214 | ||
215 | if (l < sizeof(sa_family_t)) | |
216 | return -EINVAL; | |
217 | ||
218 | return sockaddr.sa.sa_family == family; | |
219 | } | |
220 | ||
221 | return 1; | |
222 | } | |
223 | ||
60f067b4 | 224 | _public_ int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) { |
663996b3 MS |
225 | union sockaddr_union sockaddr = {}; |
226 | socklen_t l = sizeof(sockaddr); | |
227 | int r; | |
228 | ||
60f067b4 JS |
229 | assert_return(fd >= 0, -EINVAL); |
230 | assert_return(IN_SET(family, 0, AF_INET, AF_INET6), -EINVAL); | |
663996b3 MS |
231 | |
232 | r = sd_is_socket_internal(fd, type, listening); | |
233 | if (r <= 0) | |
234 | return r; | |
235 | ||
236 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
237 | return -errno; | |
238 | ||
239 | if (l < sizeof(sa_family_t)) | |
240 | return -EINVAL; | |
241 | ||
242 | if (sockaddr.sa.sa_family != AF_INET && | |
243 | sockaddr.sa.sa_family != AF_INET6) | |
244 | return 0; | |
245 | ||
60f067b4 | 246 | if (family != 0) |
663996b3 MS |
247 | if (sockaddr.sa.sa_family != family) |
248 | return 0; | |
249 | ||
250 | if (port > 0) { | |
251 | if (sockaddr.sa.sa_family == AF_INET) { | |
252 | if (l < sizeof(struct sockaddr_in)) | |
253 | return -EINVAL; | |
254 | ||
5eef597e | 255 | return htons(port) == sockaddr.in.sin_port; |
663996b3 MS |
256 | } else { |
257 | if (l < sizeof(struct sockaddr_in6)) | |
258 | return -EINVAL; | |
259 | ||
260 | return htons(port) == sockaddr.in6.sin6_port; | |
261 | } | |
262 | } | |
263 | ||
264 | return 1; | |
265 | } | |
266 | ||
60f067b4 | 267 | _public_ int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) { |
663996b3 MS |
268 | union sockaddr_union sockaddr = {}; |
269 | socklen_t l = sizeof(sockaddr); | |
270 | int r; | |
271 | ||
60f067b4 JS |
272 | assert_return(fd >= 0, -EINVAL); |
273 | ||
663996b3 MS |
274 | r = sd_is_socket_internal(fd, type, listening); |
275 | if (r <= 0) | |
276 | return r; | |
277 | ||
278 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
279 | return -errno; | |
280 | ||
281 | if (l < sizeof(sa_family_t)) | |
282 | return -EINVAL; | |
283 | ||
284 | if (sockaddr.sa.sa_family != AF_UNIX) | |
285 | return 0; | |
286 | ||
287 | if (path) { | |
288 | if (length == 0) | |
289 | length = strlen(path); | |
290 | ||
291 | if (length == 0) | |
292 | /* Unnamed socket */ | |
293 | return l == offsetof(struct sockaddr_un, sun_path); | |
294 | ||
295 | if (path[0]) | |
296 | /* Normal path socket */ | |
297 | return | |
298 | (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) && | |
299 | memcmp(path, sockaddr.un.sun_path, length+1) == 0; | |
300 | else | |
301 | /* Abstract namespace socket */ | |
302 | return | |
303 | (l == offsetof(struct sockaddr_un, sun_path) + length) && | |
304 | memcmp(path, sockaddr.un.sun_path, length) == 0; | |
305 | } | |
306 | ||
307 | return 1; | |
308 | } | |
309 | ||
60f067b4 | 310 | _public_ int sd_is_mq(int fd, const char *path) { |
663996b3 MS |
311 | struct mq_attr attr; |
312 | ||
60f067b4 | 313 | assert_return(fd >= 0, -EINVAL); |
663996b3 MS |
314 | |
315 | if (mq_getattr(fd, &attr) < 0) | |
316 | return -errno; | |
317 | ||
318 | if (path) { | |
319 | char fpath[PATH_MAX]; | |
320 | struct stat a, b; | |
321 | ||
60f067b4 | 322 | assert_return(path_is_absolute(path), -EINVAL); |
663996b3 MS |
323 | |
324 | if (fstat(fd, &a) < 0) | |
325 | return -errno; | |
326 | ||
327 | strncpy(stpcpy(fpath, "/dev/mqueue"), path, sizeof(fpath) - 12); | |
328 | fpath[sizeof(fpath)-1] = 0; | |
329 | ||
330 | if (stat(fpath, &b) < 0) | |
331 | return -errno; | |
332 | ||
333 | if (a.st_dev != b.st_dev || | |
334 | a.st_ino != b.st_ino) | |
335 | return 0; | |
336 | } | |
337 | ||
338 | return 1; | |
663996b3 MS |
339 | } |
340 | ||
e735f4d4 MP |
341 | _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char *state, const int *fds, unsigned n_fds) { |
342 | union sockaddr_union sockaddr = { | |
343 | .sa.sa_family = AF_UNIX, | |
344 | }; | |
345 | struct iovec iovec = { | |
346 | .iov_base = (char*) state, | |
347 | }; | |
348 | struct msghdr msghdr = { | |
349 | .msg_iov = &iovec, | |
350 | .msg_iovlen = 1, | |
351 | .msg_name = &sockaddr, | |
352 | }; | |
e735f4d4 MP |
353 | _cleanup_close_ int fd = -1; |
354 | struct cmsghdr *cmsg = NULL; | |
355 | const char *e; | |
e3bff60a | 356 | bool have_pid; |
60f067b4 | 357 | int r; |
663996b3 MS |
358 | |
359 | if (!state) { | |
360 | r = -EINVAL; | |
361 | goto finish; | |
362 | } | |
363 | ||
e735f4d4 MP |
364 | if (n_fds > 0 && !fds) { |
365 | r = -EINVAL; | |
366 | goto finish; | |
367 | } | |
368 | ||
663996b3 MS |
369 | e = getenv("NOTIFY_SOCKET"); |
370 | if (!e) | |
371 | return 0; | |
372 | ||
373 | /* Must be an abstract socket, or an absolute path */ | |
374 | if ((e[0] != '@' && e[0] != '/') || e[1] == 0) { | |
375 | r = -EINVAL; | |
376 | goto finish; | |
377 | } | |
378 | ||
379 | fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
380 | if (fd < 0) { | |
381 | r = -errno; | |
382 | goto finish; | |
383 | } | |
384 | ||
e735f4d4 | 385 | iovec.iov_len = strlen(state); |
663996b3 | 386 | |
e735f4d4 | 387 | strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path)); |
663996b3 MS |
388 | if (sockaddr.un.sun_path[0] == '@') |
389 | sockaddr.un.sun_path[0] = 0; | |
390 | ||
663996b3 | 391 | msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e); |
663996b3 MS |
392 | if (msghdr.msg_namelen > sizeof(struct sockaddr_un)) |
393 | msghdr.msg_namelen = sizeof(struct sockaddr_un); | |
394 | ||
e3bff60a | 395 | have_pid = pid != 0 && pid != getpid(); |
e735f4d4 | 396 | |
e3bff60a MP |
397 | if (n_fds > 0 || have_pid) { |
398 | msghdr.msg_controllen = CMSG_SPACE(sizeof(int) * n_fds) + | |
399 | CMSG_SPACE(sizeof(struct ucred) * have_pid); | |
400 | msghdr.msg_control = alloca(msghdr.msg_controllen); | |
663996b3 | 401 | |
e3bff60a MP |
402 | cmsg = CMSG_FIRSTHDR(&msghdr); |
403 | if (n_fds > 0) { | |
404 | cmsg->cmsg_level = SOL_SOCKET; | |
405 | cmsg->cmsg_type = SCM_RIGHTS; | |
406 | cmsg->cmsg_len = CMSG_LEN(sizeof(int) * n_fds); | |
e735f4d4 | 407 | |
e3bff60a | 408 | memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds); |
60f067b4 | 409 | |
e3bff60a MP |
410 | if (have_pid) |
411 | assert_se(cmsg = CMSG_NXTHDR(&msghdr, cmsg)); | |
412 | } | |
e735f4d4 | 413 | |
e3bff60a MP |
414 | if (have_pid) { |
415 | struct ucred *ucred; | |
60f067b4 | 416 | |
e3bff60a MP |
417 | cmsg->cmsg_level = SOL_SOCKET; |
418 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
419 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
60f067b4 | 420 | |
e3bff60a MP |
421 | ucred = (struct ucred*) CMSG_DATA(cmsg); |
422 | ucred->pid = pid; | |
423 | ucred->uid = getuid(); | |
424 | ucred->gid = getgid(); | |
425 | } | |
60f067b4 JS |
426 | } |
427 | ||
428 | /* First try with fake ucred data, as requested */ | |
429 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) { | |
430 | r = 1; | |
663996b3 MS |
431 | goto finish; |
432 | } | |
433 | ||
e735f4d4 | 434 | /* If that failed, try with our own ucred instead */ |
e3bff60a MP |
435 | if (have_pid) { |
436 | msghdr.msg_controllen -= CMSG_SPACE(sizeof(struct ucred)); | |
437 | if (msghdr.msg_controllen == 0) | |
e735f4d4 | 438 | msghdr.msg_control = NULL; |
60f067b4 JS |
439 | |
440 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) { | |
441 | r = 1; | |
442 | goto finish; | |
443 | } | |
444 | } | |
445 | ||
446 | r = -errno; | |
663996b3 MS |
447 | |
448 | finish: | |
449 | if (unset_environment) | |
450 | unsetenv("NOTIFY_SOCKET"); | |
451 | ||
663996b3 | 452 | return r; |
663996b3 MS |
453 | } |
454 | ||
e735f4d4 MP |
455 | _public_ int sd_pid_notify(pid_t pid, int unset_environment, const char *state) { |
456 | return sd_pid_notify_with_fds(pid, unset_environment, state, NULL, 0); | |
457 | } | |
458 | ||
60f067b4 | 459 | _public_ int sd_notify(int unset_environment, const char *state) { |
e735f4d4 | 460 | return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0); |
60f067b4 JS |
461 | } |
462 | ||
463 | _public_ int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) { | |
464 | _cleanup_free_ char *p = NULL; | |
663996b3 MS |
465 | int r; |
466 | ||
60f067b4 JS |
467 | if (format) { |
468 | va_list ap; | |
663996b3 | 469 | |
60f067b4 JS |
470 | va_start(ap, format); |
471 | r = vasprintf(&p, format, ap); | |
472 | va_end(ap); | |
663996b3 | 473 | |
60f067b4 JS |
474 | if (r < 0 || !p) |
475 | return -ENOMEM; | |
476 | } | |
663996b3 | 477 | |
60f067b4 | 478 | return sd_pid_notify(pid, unset_environment, p); |
663996b3 MS |
479 | } |
480 | ||
60f067b4 JS |
481 | _public_ int sd_notifyf(int unset_environment, const char *format, ...) { |
482 | _cleanup_free_ char *p = NULL; | |
483 | int r; | |
484 | ||
485 | if (format) { | |
486 | va_list ap; | |
487 | ||
488 | va_start(ap, format); | |
489 | r = vasprintf(&p, format, ap); | |
490 | va_end(ap); | |
491 | ||
492 | if (r < 0 || !p) | |
493 | return -ENOMEM; | |
494 | } | |
495 | ||
496 | return sd_pid_notify(0, unset_environment, p); | |
497 | } | |
498 | ||
499 | _public_ int sd_booted(void) { | |
663996b3 MS |
500 | struct stat st; |
501 | ||
502 | /* We test whether the runtime unit file directory has been | |
503 | * created. This takes place in mount-setup.c, so is | |
504 | * guaranteed to happen very early during boot. */ | |
505 | ||
506 | if (lstat("/run/systemd/system/", &st) < 0) | |
507 | return 0; | |
508 | ||
509 | return !!S_ISDIR(st.st_mode); | |
60f067b4 JS |
510 | } |
511 | ||
512 | _public_ int sd_watchdog_enabled(int unset_environment, uint64_t *usec) { | |
5eef597e | 513 | const char *s, *p = ""; /* p is set to dummy value to do unsetting */ |
60f067b4 | 514 | uint64_t u; |
5eef597e | 515 | int r = 0; |
60f067b4 | 516 | |
5eef597e MP |
517 | s = getenv("WATCHDOG_USEC"); |
518 | if (!s) | |
60f067b4 | 519 | goto finish; |
60f067b4 | 520 | |
5eef597e | 521 | r = safe_atou64(s, &u); |
60f067b4 JS |
522 | if (r < 0) |
523 | goto finish; | |
5eef597e | 524 | if (u <= 0) { |
60f067b4 JS |
525 | r = -EINVAL; |
526 | goto finish; | |
527 | } | |
528 | ||
5eef597e MP |
529 | p = getenv("WATCHDOG_PID"); |
530 | if (p) { | |
531 | pid_t pid; | |
532 | ||
533 | r = parse_pid(p, &pid); | |
534 | if (r < 0) | |
535 | goto finish; | |
536 | ||
537 | /* Is this for us? */ | |
538 | if (getpid() != pid) { | |
539 | r = 0; | |
540 | goto finish; | |
541 | } | |
60f067b4 JS |
542 | } |
543 | ||
544 | if (usec) | |
545 | *usec = u; | |
546 | ||
547 | r = 1; | |
548 | ||
549 | finish: | |
5eef597e | 550 | if (unset_environment && s) |
60f067b4 | 551 | unsetenv("WATCHDOG_USEC"); |
5eef597e MP |
552 | if (unset_environment && p) |
553 | unsetenv("WATCHDOG_PID"); | |
60f067b4 JS |
554 | |
555 | return r; | |
663996b3 | 556 | } |