1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
23 #include <sys/socket.h>
25 #include <netinet/in.h>
37 #include "path-util.h"
38 #include "socket-util.h"
39 #include "sd-daemon.h"
41 _public_ int sd_listen_fds(int unset_environment) {
47 e = getenv("LISTEN_PID");
53 r = parse_pid(e, &pid);
58 if (getpid() != pid) {
63 e = getenv("LISTEN_FDS");
73 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) n; fd ++) {
74 r = fd_cloexec(fd, true);
82 if (unset_environment) {
83 unsetenv("LISTEN_PID");
84 unsetenv("LISTEN_FDS");
90 _public_ int sd_is_fifo(int fd, const char *path) {
93 assert_return(fd >= 0, -EINVAL);
95 if (fstat(fd, &st_fd) < 0)
98 if (!S_ISFIFO(st_fd.st_mode))
104 if (stat(path, &st_path) < 0) {
106 if (errno == ENOENT || errno == ENOTDIR)
113 st_path.st_dev == st_fd.st_dev &&
114 st_path.st_ino == st_fd.st_ino;
120 _public_ int sd_is_special(int fd, const char *path) {
123 assert_return(fd >= 0, -EINVAL);
125 if (fstat(fd, &st_fd) < 0)
128 if (!S_ISREG(st_fd.st_mode) && !S_ISCHR(st_fd.st_mode))
134 if (stat(path, &st_path) < 0) {
136 if (errno == ENOENT || errno == ENOTDIR)
142 if (S_ISREG(st_fd.st_mode) && S_ISREG(st_path.st_mode))
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;
155 static int sd_is_socket_internal(int fd, int type, int listening) {
158 assert_return(fd >= 0, -EINVAL);
159 assert_return(type >= 0, -EINVAL);
161 if (fstat(fd, &st_fd) < 0)
164 if (!S_ISSOCK(st_fd.st_mode))
169 socklen_t l = sizeof(other_type);
171 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0)
174 if (l != sizeof(other_type))
177 if (other_type != type)
181 if (listening >= 0) {
183 socklen_t l = sizeof(accepting);
185 if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0)
188 if (l != sizeof(accepting))
191 if (!accepting != !listening)
198 _public_ int sd_is_socket(int fd, int family, int type, int listening) {
201 assert_return(fd >= 0, -EINVAL);
202 assert_return(family >= 0, -EINVAL);
204 r = sd_is_socket_internal(fd, type, listening);
209 union sockaddr_union sockaddr = {};
210 socklen_t l = sizeof(sockaddr);
212 if (getsockname(fd, &sockaddr.sa, &l) < 0)
215 if (l < sizeof(sa_family_t))
218 return sockaddr.sa.sa_family == family;
224 _public_ int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
225 union sockaddr_union sockaddr = {};
226 socklen_t l = sizeof(sockaddr);
229 assert_return(fd >= 0, -EINVAL);
230 assert_return(IN_SET(family, 0, AF_INET, AF_INET6), -EINVAL);
232 r = sd_is_socket_internal(fd, type, listening);
236 if (getsockname(fd, &sockaddr.sa, &l) < 0)
239 if (l < sizeof(sa_family_t))
242 if (sockaddr.sa.sa_family != AF_INET &&
243 sockaddr.sa.sa_family != AF_INET6)
247 if (sockaddr.sa.sa_family != family)
251 if (sockaddr.sa.sa_family == AF_INET) {
252 if (l < sizeof(struct sockaddr_in))
255 return htons(port) == sockaddr.in.sin_port;
257 if (l < sizeof(struct sockaddr_in6))
260 return htons(port) == sockaddr.in6.sin6_port;
267 _public_ int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
268 union sockaddr_union sockaddr = {};
269 socklen_t l = sizeof(sockaddr);
272 assert_return(fd >= 0, -EINVAL);
274 r = sd_is_socket_internal(fd, type, listening);
278 if (getsockname(fd, &sockaddr.sa, &l) < 0)
281 if (l < sizeof(sa_family_t))
284 if (sockaddr.sa.sa_family != AF_UNIX)
289 length = strlen(path);
293 return l == offsetof(struct sockaddr_un, sun_path);
296 /* Normal path socket */
298 (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) &&
299 memcmp(path, sockaddr.un.sun_path, length+1) == 0;
301 /* Abstract namespace socket */
303 (l == offsetof(struct sockaddr_un, sun_path) + length) &&
304 memcmp(path, sockaddr.un.sun_path, length) == 0;
310 _public_ int sd_is_mq(int fd, const char *path) {
313 assert_return(fd >= 0, -EINVAL);
315 if (mq_getattr(fd, &attr) < 0)
319 char fpath[PATH_MAX];
322 assert_return(path_is_absolute(path), -EINVAL);
324 if (fstat(fd, &a) < 0)
327 strncpy(stpcpy(fpath, "/dev/mqueue"), path, sizeof(fpath) - 12);
328 fpath[sizeof(fpath)-1] = 0;
330 if (stat(fpath, &b) < 0)
333 if (a.st_dev != b.st_dev ||
334 a.st_ino != b.st_ino)
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,
345 struct iovec iovec = {
346 .iov_base = (char*) state,
348 struct msghdr msghdr = {
351 .msg_name = &sockaddr,
354 struct cmsghdr cmsghdr;
355 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
356 CMSG_SPACE(sizeof(int) * n_fds)];
358 _cleanup_close_ int fd = -1;
359 struct cmsghdr *cmsg = NULL;
361 size_t controllen_without_ucred = 0;
362 bool try_without_ucred = false;
370 if (n_fds > 0 && !fds) {
375 e = getenv("NOTIFY_SOCKET");
379 /* Must be an abstract socket, or an absolute path */
380 if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
385 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
391 iovec.iov_len = strlen(state);
393 strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
394 if (sockaddr.un.sun_path[0] == '@')
395 sockaddr.un.sun_path[0] = 0;
397 msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
398 if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
399 msghdr.msg_namelen = sizeof(struct sockaddr_un);
402 msghdr.msg_control = &control;
403 msghdr.msg_controllen = CMSG_LEN(sizeof(int) * n_fds);
405 cmsg = CMSG_FIRSTHDR(&msghdr);
406 cmsg->cmsg_level = SOL_SOCKET;
407 cmsg->cmsg_type = SCM_RIGHTS;
408 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * n_fds);
410 memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds);
413 if (pid != 0 && pid != getpid()) {
416 try_without_ucred = true;
417 controllen_without_ucred = msghdr.msg_controllen;
419 msghdr.msg_control = &control;
420 msghdr.msg_controllen += CMSG_LEN(sizeof(struct ucred));
423 cmsg = CMSG_NXTHDR(&msghdr, cmsg);
425 cmsg = CMSG_FIRSTHDR(&msghdr);
427 cmsg->cmsg_level = SOL_SOCKET;
428 cmsg->cmsg_type = SCM_CREDENTIALS;
429 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
431 ucred = (struct ucred*) CMSG_DATA(cmsg);
433 ucred->uid = getuid();
434 ucred->gid = getgid();
437 /* First try with fake ucred data, as requested */
438 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
443 /* If that failed, try with our own ucred instead */
444 if (try_without_ucred) {
445 if (controllen_without_ucred <= 0)
446 msghdr.msg_control = NULL;
447 msghdr.msg_controllen = controllen_without_ucred;
449 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
458 if (unset_environment)
459 unsetenv("NOTIFY_SOCKET");
464 _public_ int sd_pid_notify(pid_t pid, int unset_environment, const char *state) {
465 return sd_pid_notify_with_fds(pid, unset_environment, state, NULL, 0);
468 _public_ int sd_notify(int unset_environment, const char *state) {
469 return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0);
472 _public_ int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) {
473 _cleanup_free_ char *p = NULL;
479 va_start(ap, format);
480 r = vasprintf(&p, format, ap);
487 return sd_pid_notify(pid, unset_environment, p);
490 _public_ int sd_notifyf(int unset_environment, const char *format, ...) {
491 _cleanup_free_ char *p = NULL;
497 va_start(ap, format);
498 r = vasprintf(&p, format, ap);
505 return sd_pid_notify(0, unset_environment, p);
508 _public_ int sd_booted(void) {
511 /* We test whether the runtime unit file directory has been
512 * created. This takes place in mount-setup.c, so is
513 * guaranteed to happen very early during boot. */
515 if (lstat("/run/systemd/system/", &st) < 0)
518 return !!S_ISDIR(st.st_mode);
521 _public_ int sd_watchdog_enabled(int unset_environment, uint64_t *usec) {
522 const char *s, *p = ""; /* p is set to dummy value to do unsetting */
526 s = getenv("WATCHDOG_USEC");
530 r = safe_atou64(s, &u);
538 p = getenv("WATCHDOG_PID");
542 r = parse_pid(p, &pid);
546 /* Is this for us? */
547 if (getpid() != pid) {
559 if (unset_environment && s)
560 unsetenv("WATCHDOG_USEC");
561 if (unset_environment && p)
562 unsetenv("WATCHDOG_PID");