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Commit | Line | Data |
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abbbea81 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | /*** | |
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | Permission is hereby granted, free of charge, to any person | |
7 | obtaining a copy of this software and associated documentation files | |
8 | (the "Software"), to deal in the Software without restriction, | |
9 | including without limitation the rights to use, copy, modify, merge, | |
10 | publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | and to permit persons to whom the Software is furnished to do so, | |
12 | subject to the following conditions: | |
13 | ||
14 | The above copyright notice and this permission notice shall be | |
15 | included in all copies or substantial portions of the Software. | |
16 | ||
17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
18 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
19 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
20 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
21 | BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
22 | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
23 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
24 | SOFTWARE. | |
25 | ***/ | |
26 | ||
8c47c732 LP |
27 | #ifndef _GNU_SOURCE |
28 | #define _GNU_SOURCE | |
29 | #endif | |
30 | ||
7c394faa LP |
31 | #include <sys/types.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/socket.h> | |
34 | #include <sys/un.h> | |
8640e111 | 35 | #include <sys/fcntl.h> |
7c394faa | 36 | #include <netinet/in.h> |
abbbea81 LP |
37 | #include <stdlib.h> |
38 | #include <errno.h> | |
abbbea81 | 39 | #include <unistd.h> |
7c394faa | 40 | #include <string.h> |
8c47c732 LP |
41 | #include <stdarg.h> |
42 | #include <stdio.h> | |
abbbea81 LP |
43 | |
44 | #include "sd-daemon.h" | |
45 | ||
46 | int sd_listen_fds(int unset_environment) { | |
47 | ||
8c47c732 | 48 | #if defined(DISABLE_SYSTEMD) || !defined(__linux__) |
abbbea81 LP |
49 | return 0; |
50 | #else | |
8640e111 | 51 | int r, fd; |
abbbea81 LP |
52 | const char *e; |
53 | char *p = NULL; | |
54 | unsigned long l; | |
55 | ||
56 | if (!(e = getenv("LISTEN_PID"))) { | |
57 | r = 0; | |
58 | goto finish; | |
59 | } | |
60 | ||
61 | errno = 0; | |
62 | l = strtoul(e, &p, 10); | |
63 | ||
64 | if (errno != 0) { | |
65 | r = -errno; | |
66 | goto finish; | |
67 | } | |
68 | ||
69 | if (!p || *p || l <= 0) { | |
70 | r = -EINVAL; | |
71 | goto finish; | |
72 | } | |
73 | ||
74 | /* Is this for us? */ | |
75 | if (getpid() != (pid_t) l) { | |
76 | r = 0; | |
77 | goto finish; | |
78 | } | |
79 | ||
80 | if (!(e = getenv("LISTEN_FDS"))) { | |
81 | r = 0; | |
82 | goto finish; | |
83 | } | |
84 | ||
85 | errno = 0; | |
86 | l = strtoul(e, &p, 10); | |
87 | ||
88 | if (errno != 0) { | |
89 | r = -errno; | |
90 | goto finish; | |
91 | } | |
92 | ||
93 | if (!p || *p) { | |
94 | r = -EINVAL; | |
95 | goto finish; | |
96 | } | |
97 | ||
8640e111 LP |
98 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) { |
99 | int flags; | |
100 | ||
101 | if ((flags = fcntl(fd, F_GETFD)) < 0) { | |
102 | r = -errno; | |
103 | goto finish; | |
104 | } | |
105 | ||
106 | if (flags & FD_CLOEXEC) | |
107 | continue; | |
108 | ||
109 | if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) { | |
110 | r = -errno; | |
111 | goto finish; | |
112 | } | |
113 | } | |
114 | ||
abbbea81 LP |
115 | r = (int) l; |
116 | ||
117 | finish: | |
118 | if (unset_environment) { | |
119 | unsetenv("LISTEN_PID"); | |
120 | unsetenv("LISTEN_FDS"); | |
121 | } | |
122 | ||
123 | return r; | |
124 | #endif | |
125 | } | |
7c394faa LP |
126 | |
127 | int sd_is_fifo(int fd, const char *path) { | |
128 | struct stat st_fd; | |
129 | ||
130 | if (fd < 0) | |
131 | return -EINVAL; | |
132 | ||
133 | memset(&st_fd, 0, sizeof(st_fd)); | |
134 | if (fstat(fd, &st_fd) < 0) | |
135 | return -errno; | |
136 | ||
137 | if (!S_ISFIFO(st_fd.st_mode)) | |
138 | return 0; | |
139 | ||
140 | if (path) { | |
141 | struct stat st_path; | |
142 | ||
143 | memset(&st_path, 0, sizeof(st_path)); | |
144 | if (fstat(fd, &st_path) < 0) { | |
145 | ||
146 | if (errno == ENOENT || errno == ENOTDIR) | |
147 | return 0; | |
148 | ||
149 | return -errno; | |
150 | } | |
151 | ||
152 | return | |
153 | st_path.st_dev == st_fd.st_dev && | |
154 | st_path.st_ino == st_fd.st_ino; | |
155 | } | |
156 | ||
157 | return 1; | |
158 | } | |
159 | ||
88ce42f6 | 160 | static int sd_is_socket_internal(int fd, int type, int listening) { |
7c394faa LP |
161 | struct stat st_fd; |
162 | ||
163 | if (fd < 0 || type < 0) | |
164 | return -EINVAL; | |
165 | ||
166 | if (fstat(fd, &st_fd) < 0) | |
167 | return -errno; | |
168 | ||
169 | if (!S_ISSOCK(st_fd.st_mode)) | |
170 | return 0; | |
171 | ||
172 | if (type != 0) { | |
173 | int other_type = 0; | |
174 | socklen_t l = sizeof(other_type); | |
175 | ||
176 | if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0) | |
177 | return -errno; | |
178 | ||
179 | if (l != sizeof(other_type)) | |
180 | return -EINVAL; | |
181 | ||
182 | if (other_type != type) | |
183 | return 0; | |
184 | } | |
185 | ||
186 | if (listening >= 0) { | |
187 | int accepting = 0; | |
188 | socklen_t l = sizeof(accepting); | |
189 | ||
190 | if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0) | |
191 | return -errno; | |
192 | ||
193 | if (l != sizeof(accepting)) | |
194 | return -EINVAL; | |
195 | ||
dde770cf | 196 | if (!accepting != !listening) |
7c394faa LP |
197 | return 0; |
198 | } | |
199 | ||
200 | return 1; | |
201 | } | |
202 | ||
88ce42f6 LP |
203 | union sockaddr_union { |
204 | struct sockaddr sa; | |
205 | struct sockaddr_in in4; | |
206 | struct sockaddr_in6 in6; | |
207 | struct sockaddr_un un; | |
208 | struct sockaddr_storage storage; | |
209 | }; | |
210 | ||
211 | int sd_is_socket(int fd, int family, int type, int listening) { | |
212 | int r; | |
213 | ||
214 | if (family < 0) | |
215 | return -EINVAL; | |
216 | ||
217 | if ((r = sd_is_socket_internal(fd, type, listening)) <= 0) | |
218 | return r; | |
219 | ||
220 | if (family > 0) { | |
221 | union sockaddr_union sockaddr; | |
222 | socklen_t l; | |
223 | ||
224 | memset(&sockaddr, 0, sizeof(sockaddr)); | |
225 | l = sizeof(sockaddr); | |
226 | ||
227 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
228 | return -errno; | |
229 | ||
230 | if (l < sizeof(sa_family_t)) | |
231 | return -EINVAL; | |
232 | ||
233 | return sockaddr.sa.sa_family == family; | |
234 | } | |
235 | ||
236 | return 1; | |
237 | } | |
238 | ||
239 | int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) { | |
240 | union sockaddr_union sockaddr; | |
7c394faa LP |
241 | socklen_t l; |
242 | int r; | |
243 | ||
88ce42f6 LP |
244 | if (family != 0 && family != AF_INET && family != AF_INET6) |
245 | return -EINVAL; | |
246 | ||
247 | if ((r = sd_is_socket_internal(fd, type, listening)) <= 0) | |
7c394faa LP |
248 | return r; |
249 | ||
250 | memset(&sockaddr, 0, sizeof(sockaddr)); | |
251 | l = sizeof(sockaddr); | |
252 | ||
253 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
254 | return -errno; | |
255 | ||
88ce42f6 | 256 | if (l < sizeof(sa_family_t)) |
7c394faa LP |
257 | return -EINVAL; |
258 | ||
259 | if (sockaddr.sa.sa_family != AF_INET && | |
260 | sockaddr.sa.sa_family != AF_INET6) | |
261 | return 0; | |
262 | ||
88ce42f6 LP |
263 | if (family > 0) |
264 | if (sockaddr.sa.sa_family != family) | |
265 | return 0; | |
266 | ||
7c394faa LP |
267 | if (port > 0) { |
268 | if (sockaddr.sa.sa_family == AF_INET) { | |
269 | if (l < sizeof(struct sockaddr_in)) | |
270 | return -EINVAL; | |
271 | ||
272 | return htons(port) == sockaddr.in4.sin_port; | |
273 | } else { | |
274 | if (l < sizeof(struct sockaddr_in6)) | |
275 | return -EINVAL; | |
276 | ||
277 | return htons(port) == sockaddr.in6.sin6_port; | |
278 | } | |
279 | } | |
280 | ||
281 | return 1; | |
282 | } | |
283 | ||
284 | int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) { | |
88ce42f6 | 285 | union sockaddr_union sockaddr; |
7c394faa LP |
286 | socklen_t l; |
287 | int r; | |
288 | ||
88ce42f6 | 289 | if ((r = sd_is_socket_internal(fd, type, listening)) <= 0) |
7c394faa LP |
290 | return r; |
291 | ||
292 | memset(&sockaddr, 0, sizeof(sockaddr)); | |
293 | l = sizeof(sockaddr); | |
294 | ||
295 | if (getsockname(fd, &sockaddr.sa, &l) < 0) | |
296 | return -errno; | |
297 | ||
298 | if (l < sizeof(sa_family_t)) | |
299 | return -EINVAL; | |
300 | ||
301 | if (sockaddr.sa.sa_family != AF_UNIX) | |
302 | return 0; | |
303 | ||
304 | if (path) { | |
305 | if (length <= 0) | |
306 | length = strlen(path); | |
307 | ||
308 | if (length <= 0) | |
309 | /* Unnamed socket */ | |
310 | return l == sizeof(sa_family_t); | |
311 | ||
7c394faa LP |
312 | if (path[0]) |
313 | /* Normal path socket */ | |
cd250a39 LP |
314 | return |
315 | (l >= sizeof(sa_family_t) + length + 1) && | |
316 | memcmp(path, sockaddr.un.sun_path, length+1) == 0; | |
7c394faa LP |
317 | else |
318 | /* Abstract namespace socket */ | |
cd250a39 LP |
319 | return |
320 | (l == sizeof(sa_family_t) + length) && | |
321 | memcmp(path, sockaddr.un.sun_path, length) == 0; | |
7c394faa LP |
322 | } |
323 | ||
324 | return 1; | |
325 | } | |
8c47c732 LP |
326 | |
327 | int sd_notify(int unset_environment, const char *state) { | |
328 | #if defined(DISABLE_SYSTEMD) || !defined(__linux__) | |
329 | return 0; | |
330 | #else | |
331 | int fd = -1, r; | |
332 | struct msghdr msghdr; | |
333 | struct iovec iovec; | |
334 | union sockaddr_union sockaddr; | |
335 | struct ucred *ucred; | |
336 | union { | |
337 | struct cmsghdr cmsghdr; | |
338 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
339 | } control; | |
340 | const char *e; | |
341 | ||
342 | if (!state) { | |
343 | r = -EINVAL; | |
344 | goto finish; | |
345 | } | |
346 | ||
08bfb810 LP |
347 | if (!(e = getenv("NOTIFY_SOCKET"))) |
348 | return 0; | |
8c47c732 LP |
349 | |
350 | /* Must be an abstract socket, or an absolute path */ | |
351 | if ((e[0] != '@' && e[0] != '/') || e[1] == 0) { | |
352 | r = -EINVAL; | |
353 | goto finish; | |
354 | } | |
355 | ||
356 | if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) { | |
357 | r = -errno; | |
358 | goto finish; | |
359 | } | |
360 | ||
361 | memset(&sockaddr, 0, sizeof(sockaddr)); | |
362 | sockaddr.sa.sa_family = AF_UNIX; | |
363 | strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path)); | |
364 | ||
365 | if (sockaddr.un.sun_path[0] == '@') | |
366 | sockaddr.un.sun_path[0] = 0; | |
367 | ||
368 | memset(&iovec, 0, sizeof(iovec)); | |
369 | iovec.iov_base = (char*) state; | |
370 | iovec.iov_len = strlen(state); | |
371 | ||
372 | memset(&control, 0, sizeof(control)); | |
373 | control.cmsghdr.cmsg_level = SOL_SOCKET; | |
374 | control.cmsghdr.cmsg_type = SCM_CREDENTIALS; | |
375 | control.cmsghdr.cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
376 | ||
377 | ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr); | |
378 | ucred->pid = getpid(); | |
379 | ucred->uid = getuid(); | |
380 | ucred->gid = getgid(); | |
381 | ||
382 | memset(&msghdr, 0, sizeof(msghdr)); | |
383 | msghdr.msg_name = &sockaddr; | |
384 | msghdr.msg_namelen = sizeof(struct sockaddr_un); | |
385 | msghdr.msg_iov = &iovec; | |
386 | msghdr.msg_iovlen = 1; | |
387 | msghdr.msg_control = &control; | |
388 | msghdr.msg_controllen = control.cmsghdr.cmsg_len; | |
389 | ||
390 | if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) { | |
391 | r = -errno; | |
392 | goto finish; | |
393 | } | |
394 | ||
08bfb810 | 395 | r = 1; |
8c47c732 LP |
396 | |
397 | finish: | |
398 | if (unset_environment) | |
399 | unsetenv("NOTIFY_SOCKET"); | |
400 | ||
401 | if (fd >= 0) | |
402 | close(fd); | |
403 | ||
404 | return r; | |
405 | #endif | |
406 | } | |
407 | ||
408 | int sd_notifyf(int unset_environment, const char *format, ...) { | |
409 | #if defined(DISABLE_SYSTEMD) || !defined(__linux__) | |
410 | return 0; | |
411 | #else | |
412 | va_list ap; | |
413 | char *p = NULL; | |
414 | int r; | |
415 | ||
416 | va_start(ap, format); | |
417 | r = vasprintf(&p, format, ap); | |
418 | va_end(ap); | |
419 | ||
420 | if (r < 0 || !p) | |
421 | return -ENOMEM; | |
422 | ||
423 | r = sd_notify(unset_environment, p); | |
424 | free(p); | |
425 | ||
426 | return r; | |
427 | #endif | |
428 | } | |
40473a70 LP |
429 | |
430 | int sd_booted(void) { | |
431 | #if defined(DISABLE_SYSTEMD) || !defined(__linux__) | |
432 | return 0; | |
433 | #else | |
434 | ||
435 | struct stat a, b; | |
436 | ||
437 | /* We simply test whether the systemd cgroup hierarchy is | |
438 | * mounted */ | |
439 | ||
440 | if (lstat("/cgroup", &a) < 0) | |
441 | return 0; | |
442 | ||
443 | if (lstat("/cgroup/systemd", &b) < 0) | |
444 | return 0; | |
445 | ||
446 | return a.st_dev != b.st_dev; | |
447 | #endif | |
448 | } |