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Commit | Line | Data |
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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
abbbea81 LP |
2 | |
3 | /*** | |
0ebee881 KS |
4 | This file is part of systemd. |
5 | ||
abbbea81 LP |
6 | Copyright 2010 Lennart Poettering |
7 | ||
0ebee881 KS |
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. | |
12 | ||
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. | |
abbbea81 | 17 | |
0ebee881 KS |
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 | ***/ | |
8c47c732 | 21 | |
7c394faa LP |
22 | #include <sys/stat.h> |
23 | #include <sys/socket.h> | |
24 | #include <sys/un.h> | |
25 | #include <netinet/in.h> | |
abbbea81 LP |
26 | #include <stdlib.h> |
27 | #include <errno.h> | |
abbbea81 | 28 | #include <unistd.h> |
7c394faa | 29 | #include <string.h> |
8c47c732 LP |
30 | #include <stdarg.h> |
31 | #include <stdio.h> | |
0e098b15 | 32 | #include <stddef.h> |
916abb21 | 33 | #include <limits.h> |
0ebee881 | 34 | #include <mqueue.h> |
abbbea81 | 35 | |
29804cc1 | 36 | #include "util.h" |
be8f4e9e | 37 | #include "path-util.h" |
3cb46740 | 38 | #include "socket-util.h" |
abbbea81 LP |
39 | #include "sd-daemon.h" |
40 | ||
0ebee881 | 41 | _public_ int sd_listen_fds(int unset_environment) { |
abbbea81 | 42 | const char *e; |
be8f4e9e LP |
43 | unsigned n; |
44 | int r, fd; | |
45 | pid_t pid; | |
abbbea81 | 46 | |
50425d16 MS |
47 | e = getenv("LISTEN_PID"); |
48 | if (!e) { | |
abbbea81 LP |
49 | r = 0; |
50 | goto finish; | |
51 | } | |
52 | ||
be8f4e9e LP |
53 | r = parse_pid(e, &pid); |
54 | if (r < 0) | |
abbbea81 | 55 | goto finish; |
abbbea81 LP |
56 | |
57 | /* Is this for us? */ | |
be8f4e9e | 58 | if (getpid() != pid) { |
abbbea81 LP |
59 | r = 0; |
60 | goto finish; | |
61 | } | |
62 | ||
50425d16 MS |
63 | e = getenv("LISTEN_FDS"); |
64 | if (!e) { | |
abbbea81 LP |
65 | r = 0; |
66 | goto finish; | |
67 | } | |
68 | ||
be8f4e9e LP |
69 | r = safe_atou(e, &n); |
70 | if (r < 0) | |
abbbea81 | 71 | goto finish; |
8640e111 | 72 | |
be8f4e9e LP |
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) | |
8640e111 | 76 | goto finish; |
8640e111 LP |
77 | } |
78 | ||
be8f4e9e | 79 | r = (int) n; |
abbbea81 LP |
80 | |
81 | finish: | |
82 | if (unset_environment) { | |
83 | unsetenv("LISTEN_PID"); | |
84 | unsetenv("LISTEN_FDS"); | |
85 | } | |
86 | ||
87 | return r; | |
abbbea81 | 88 | } |
7c394faa | 89 | |
0ebee881 | 90 | _public_ int sd_is_fifo(int fd, const char *path) { |
7c394faa LP |
91 | struct stat st_fd; |
92 | ||
be8f4e9e | 93 | assert_return(fd >= 0, -EINVAL); |
7c394faa | 94 | |
7c394faa LP |
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 | ||
fd8bccfb | 104 | if (stat(path, &st_path) < 0) { |
7c394faa LP |
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 | ||
0ebee881 | 120 | _public_ int sd_is_special(int fd, const char *path) { |
4160ec67 WD |
121 | struct stat st_fd; |
122 | ||
be8f4e9e | 123 | assert_return(fd >= 0, -EINVAL); |
4160ec67 WD |
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 | ||
e6a3081a | 155 | static int sd_is_socket_internal(int fd, int type, int listening) { |
7c394faa LP |
156 | struct stat st_fd; |
157 | ||
be8f4e9e LP |
158 | assert_return(fd >= 0, -EINVAL); |
159 | assert_return(type >= 0, -EINVAL); | |
7c394faa LP |
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 | ||
dde770cf | 191 | if (!accepting != !listening) |
7c394faa LP |
192 | return 0; |
193 | } | |
194 | ||
195 | return 1; | |
196 | } | |
197 | ||
0ebee881 | 198 | _public_ int sd_is_socket(int fd, int family, int type, int listening) { |
88ce42f6 LP |
199 | int r; |
200 | ||
be8f4e9e LP |
201 | assert_return(fd >= 0, -EINVAL); |
202 | assert_return(family >= 0, -EINVAL); | |
88ce42f6 | 203 | |
50425d16 MS |
204 | r = sd_is_socket_internal(fd, type, listening); |
205 | if (r <= 0) | |
88ce42f6 LP |
206 | return r; |
207 | ||
208 | if (family > 0) { | |
1c633045 ZJS |
209 | union sockaddr_union sockaddr = {}; |
210 | socklen_t l = sizeof(sockaddr); | |
88ce42f6 LP |
211 | |
212 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
213 | return -errno; | |
214 | ||
b7f42664 | 215 | if (l < sizeof(sa_family_t)) |
88ce42f6 LP |
216 | return -EINVAL; |
217 | ||
218 | return sockaddr.sa.sa_family == family; | |
219 | } | |
220 | ||
221 | return 1; | |
222 | } | |
223 | ||
0ebee881 | 224 | _public_ int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) { |
1c633045 ZJS |
225 | union sockaddr_union sockaddr = {}; |
226 | socklen_t l = sizeof(sockaddr); | |
7c394faa LP |
227 | int r; |
228 | ||
be8f4e9e LP |
229 | assert_return(fd >= 0, -EINVAL); |
230 | assert_return(IN_SET(family, 0, AF_INET, AF_INET6), -EINVAL); | |
88ce42f6 | 231 | |
50425d16 MS |
232 | r = sd_is_socket_internal(fd, type, listening); |
233 | if (r <= 0) | |
7c394faa LP |
234 | return r; |
235 | ||
7c394faa LP |
236 | if (getsockname(fd, &sockaddr.sa, &l) < 0) |
237 | return -errno; | |
238 | ||
b7f42664 | 239 | if (l < sizeof(sa_family_t)) |
7c394faa LP |
240 | return -EINVAL; |
241 | ||
242 | if (sockaddr.sa.sa_family != AF_INET && | |
243 | sockaddr.sa.sa_family != AF_INET6) | |
244 | return 0; | |
245 | ||
be8f4e9e | 246 | if (family != 0) |
88ce42f6 LP |
247 | if (sockaddr.sa.sa_family != family) |
248 | return 0; | |
249 | ||
7c394faa LP |
250 | if (port > 0) { |
251 | if (sockaddr.sa.sa_family == AF_INET) { | |
252 | if (l < sizeof(struct sockaddr_in)) | |
253 | return -EINVAL; | |
254 | ||
3cb46740 | 255 | return htons(port) == sockaddr.in.sin_port; |
7c394faa LP |
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 | ||
0ebee881 | 267 | _public_ int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) { |
1c633045 ZJS |
268 | union sockaddr_union sockaddr = {}; |
269 | socklen_t l = sizeof(sockaddr); | |
7c394faa LP |
270 | int r; |
271 | ||
be8f4e9e LP |
272 | assert_return(fd >= 0, -EINVAL); |
273 | ||
50425d16 MS |
274 | r = sd_is_socket_internal(fd, type, listening); |
275 | if (r <= 0) | |
7c394faa LP |
276 | return r; |
277 | ||
7c394faa LP |
278 | if (getsockname(fd, &sockaddr.sa, &l) < 0) |
279 | return -errno; | |
280 | ||
b7f42664 | 281 | if (l < sizeof(sa_family_t)) |
7c394faa LP |
282 | return -EINVAL; |
283 | ||
284 | if (sockaddr.sa.sa_family != AF_UNIX) | |
285 | return 0; | |
286 | ||
287 | if (path) { | |
d1d7caee | 288 | if (length == 0) |
7c394faa LP |
289 | length = strlen(path); |
290 | ||
d1d7caee | 291 | if (length == 0) |
7c394faa | 292 | /* Unnamed socket */ |
0e098b15 | 293 | return l == offsetof(struct sockaddr_un, sun_path); |
7c394faa | 294 | |
7c394faa LP |
295 | if (path[0]) |
296 | /* Normal path socket */ | |
cd250a39 | 297 | return |
0e098b15 | 298 | (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) && |
cd250a39 | 299 | memcmp(path, sockaddr.un.sun_path, length+1) == 0; |
7c394faa LP |
300 | else |
301 | /* Abstract namespace socket */ | |
cd250a39 | 302 | return |
0e098b15 | 303 | (l == offsetof(struct sockaddr_un, sun_path) + length) && |
cd250a39 | 304 | memcmp(path, sockaddr.un.sun_path, length) == 0; |
7c394faa LP |
305 | } |
306 | ||
307 | return 1; | |
308 | } | |
8c47c732 | 309 | |
0ebee881 | 310 | _public_ int sd_is_mq(int fd, const char *path) { |
916abb21 LP |
311 | struct mq_attr attr; |
312 | ||
be8f4e9e | 313 | assert_return(fd >= 0, -EINVAL); |
916abb21 LP |
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 | ||
be8f4e9e | 322 | assert_return(path_is_absolute(path), -EINVAL); |
916abb21 LP |
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; | |
916abb21 LP |
339 | } |
340 | ||
a354329f LP |
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 | }; | |
a354329f LP |
353 | _cleanup_close_ int fd = -1; |
354 | struct cmsghdr *cmsg = NULL; | |
355 | const char *e; | |
64144440 | 356 | bool have_pid; |
be8f4e9e | 357 | int r; |
8c47c732 LP |
358 | |
359 | if (!state) { | |
360 | r = -EINVAL; | |
361 | goto finish; | |
362 | } | |
363 | ||
a354329f LP |
364 | if (n_fds > 0 && !fds) { |
365 | r = -EINVAL; | |
366 | goto finish; | |
367 | } | |
368 | ||
50425d16 MS |
369 | e = getenv("NOTIFY_SOCKET"); |
370 | if (!e) | |
08bfb810 | 371 | return 0; |
8c47c732 LP |
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 | ||
50425d16 MS |
379 | fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); |
380 | if (fd < 0) { | |
8c47c732 LP |
381 | r = -errno; |
382 | goto finish; | |
383 | } | |
384 | ||
a354329f | 385 | iovec.iov_len = strlen(state); |
8c47c732 | 386 | |
a354329f | 387 | strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path)); |
8c47c732 LP |
388 | if (sockaddr.un.sun_path[0] == '@') |
389 | sockaddr.un.sun_path[0] = 0; | |
390 | ||
0e098b15 | 391 | msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e); |
a013bd94 LP |
392 | if (msghdr.msg_namelen > sizeof(struct sockaddr_un)) |
393 | msghdr.msg_namelen = sizeof(struct sockaddr_un); | |
394 | ||
64144440 | 395 | have_pid = pid != 0 && pid != getpid(); |
d4a144fa | 396 | |
64144440 ZJS |
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); | |
a354329f LP |
401 | |
402 | cmsg = CMSG_FIRSTHDR(&msghdr); | |
64144440 ZJS |
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); | |
a354329f | 407 | |
64144440 | 408 | memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds); |
be8f4e9e | 409 | |
64144440 ZJS |
410 | if (have_pid) |
411 | assert_se(cmsg = CMSG_NXTHDR(&msghdr, cmsg)); | |
412 | } | |
a354329f | 413 | |
64144440 ZJS |
414 | if (have_pid) { |
415 | struct ucred *ucred; | |
be8f4e9e | 416 | |
64144440 ZJS |
417 | cmsg->cmsg_level = SOL_SOCKET; |
418 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
419 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
be8f4e9e | 420 | |
64144440 ZJS |
421 | ucred = (struct ucred*) CMSG_DATA(cmsg); |
422 | ucred->pid = pid; | |
423 | ucred->uid = getuid(); | |
424 | ucred->gid = getgid(); | |
425 | } | |
be8f4e9e LP |
426 | } |
427 | ||
428 | /* First try with fake ucred data, as requested */ | |
429 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) { | |
430 | r = 1; | |
8c47c732 LP |
431 | goto finish; |
432 | } | |
433 | ||
a354329f | 434 | /* If that failed, try with our own ucred instead */ |
64144440 ZJS |
435 | if (have_pid) { |
436 | msghdr.msg_controllen -= CMSG_SPACE(sizeof(struct ucred)); | |
437 | if (msghdr.msg_controllen == 0) | |
a354329f | 438 | msghdr.msg_control = NULL; |
be8f4e9e LP |
439 | |
440 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) { | |
441 | r = 1; | |
442 | goto finish; | |
443 | } | |
444 | } | |
445 | ||
446 | r = -errno; | |
8c47c732 LP |
447 | |
448 | finish: | |
449 | if (unset_environment) | |
450 | unsetenv("NOTIFY_SOCKET"); | |
451 | ||
8c47c732 | 452 | return r; |
8c47c732 LP |
453 | } |
454 | ||
a354329f LP |
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 | ||
be8f4e9e | 459 | _public_ int sd_notify(int unset_environment, const char *state) { |
a354329f | 460 | return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0); |
be8f4e9e LP |
461 | } |
462 | ||
463 | _public_ int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) { | |
464 | _cleanup_free_ char *p = NULL; | |
465 | int r; | |
466 | ||
467 | if (format) { | |
468 | va_list ap; | |
469 | ||
470 | va_start(ap, format); | |
471 | r = vasprintf(&p, format, ap); | |
472 | va_end(ap); | |
473 | ||
474 | if (r < 0 || !p) | |
475 | return -ENOMEM; | |
476 | } | |
477 | ||
478 | return sd_pid_notify(pid, unset_environment, p); | |
479 | } | |
480 | ||
0ebee881 | 481 | _public_ int sd_notifyf(int unset_environment, const char *format, ...) { |
be8f4e9e | 482 | _cleanup_free_ char *p = NULL; |
8c47c732 LP |
483 | int r; |
484 | ||
be8f4e9e LP |
485 | if (format) { |
486 | va_list ap; | |
8c47c732 | 487 | |
be8f4e9e LP |
488 | va_start(ap, format); |
489 | r = vasprintf(&p, format, ap); | |
490 | va_end(ap); | |
8c47c732 | 491 | |
be8f4e9e LP |
492 | if (r < 0 || !p) |
493 | return -ENOMEM; | |
494 | } | |
8c47c732 | 495 | |
be8f4e9e | 496 | return sd_pid_notify(0, unset_environment, p); |
8c47c732 | 497 | } |
40473a70 | 498 | |
0ebee881 | 499 | _public_ int sd_booted(void) { |
66e41181 | 500 | struct stat st; |
40473a70 | 501 | |
66e41181 LP |
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. */ | |
40473a70 | 505 | |
66e41181 | 506 | if (lstat("/run/systemd/system/", &st) < 0) |
40473a70 LP |
507 | return 0; |
508 | ||
66e41181 | 509 | return !!S_ISDIR(st.st_mode); |
40473a70 | 510 | } |
09812eb7 | 511 | |
0ebee881 | 512 | _public_ int sd_watchdog_enabled(int unset_environment, uint64_t *usec) { |
a9becdd6 | 513 | const char *s, *p = ""; /* p is set to dummy value to do unsetting */ |
be8f4e9e | 514 | uint64_t u; |
a9becdd6 | 515 | int r = 0; |
09812eb7 | 516 | |
a9becdd6 ZJS |
517 | s = getenv("WATCHDOG_USEC"); |
518 | if (!s) | |
09812eb7 | 519 | goto finish; |
09812eb7 | 520 | |
a9becdd6 | 521 | r = safe_atou64(s, &u); |
be8f4e9e | 522 | if (r < 0) |
09812eb7 | 523 | goto finish; |
a9becdd6 | 524 | if (u <= 0) { |
09812eb7 LP |
525 | r = -EINVAL; |
526 | goto finish; | |
527 | } | |
528 | ||
a9becdd6 ZJS |
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 | } | |
09812eb7 LP |
542 | } |
543 | ||
544 | if (usec) | |
be8f4e9e | 545 | *usec = u; |
09812eb7 LP |
546 | |
547 | r = 1; | |
548 | ||
549 | finish: | |
a9becdd6 | 550 | if (unset_environment && s) |
09812eb7 | 551 | unsetenv("WATCHDOG_USEC"); |
a9becdd6 ZJS |
552 | if (unset_environment && p) |
553 | unsetenv("WATCHDOG_PID"); | |
09812eb7 LP |
554 | |
555 | return r; | |
09812eb7 | 556 | } |