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, -EBADF);
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, -EBADF);
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, -EBADF);
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, -EBADF);
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, -EBADF);
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, -EBADF);
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 /// UNNEEDED by elogind
312 _public_ int sd_is_mq(int fd, const char *path) {
315 assert_return(fd >= 0, -EBADF);
317 if (mq_getattr(fd, &attr) < 0)
321 char fpath[PATH_MAX];
324 assert_return(path_is_absolute(path), -EINVAL);
326 if (fstat(fd, &a) < 0)
329 strncpy(stpcpy(fpath, "/dev/mqueue"), path, sizeof(fpath) - 12);
330 fpath[sizeof(fpath)-1] = 0;
332 if (stat(fpath, &b) < 0)
335 if (a.st_dev != b.st_dev ||
336 a.st_ino != b.st_ino)
344 _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char *state, const int *fds, unsigned n_fds) {
345 union sockaddr_union sockaddr = {
346 .sa.sa_family = AF_UNIX,
348 struct iovec iovec = {
349 .iov_base = (char*) state,
351 struct msghdr msghdr = {
354 .msg_name = &sockaddr,
356 _cleanup_close_ int fd = -1;
357 struct cmsghdr *cmsg = NULL;
367 if (n_fds > 0 && !fds) {
372 e = getenv("NOTIFY_SOCKET");
376 /* Must be an abstract socket, or an absolute path */
377 if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
382 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
388 iovec.iov_len = strlen(state);
390 strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
391 if (sockaddr.un.sun_path[0] == '@')
392 sockaddr.un.sun_path[0] = 0;
394 msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
395 if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
396 msghdr.msg_namelen = sizeof(struct sockaddr_un);
398 have_pid = pid != 0 && pid != getpid();
400 if (n_fds > 0 || have_pid) {
401 msghdr.msg_controllen = CMSG_SPACE(sizeof(int) * n_fds) +
402 CMSG_SPACE(sizeof(struct ucred) * have_pid);
403 msghdr.msg_control = alloca(msghdr.msg_controllen);
405 cmsg = CMSG_FIRSTHDR(&msghdr);
407 cmsg->cmsg_level = SOL_SOCKET;
408 cmsg->cmsg_type = SCM_RIGHTS;
409 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * n_fds);
411 memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds);
414 assert_se(cmsg = CMSG_NXTHDR(&msghdr, cmsg));
420 cmsg->cmsg_level = SOL_SOCKET;
421 cmsg->cmsg_type = SCM_CREDENTIALS;
422 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
424 ucred = (struct ucred*) CMSG_DATA(cmsg);
426 ucred->uid = getuid();
427 ucred->gid = getgid();
431 /* First try with fake ucred data, as requested */
432 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
437 /* If that failed, try with our own ucred instead */
439 msghdr.msg_controllen -= CMSG_SPACE(sizeof(struct ucred));
440 if (msghdr.msg_controllen == 0)
441 msghdr.msg_control = NULL;
443 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
452 if (unset_environment)
453 unsetenv("NOTIFY_SOCKET");
458 _public_ int sd_pid_notify(pid_t pid, int unset_environment, const char *state) {
459 return sd_pid_notify_with_fds(pid, unset_environment, state, NULL, 0);
462 _public_ int sd_notify(int unset_environment, const char *state) {
463 return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0);
466 _public_ int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) {
467 _cleanup_free_ char *p = NULL;
473 va_start(ap, format);
474 r = vasprintf(&p, format, ap);
481 return sd_pid_notify(pid, unset_environment, p);
484 _public_ int sd_notifyf(int unset_environment, const char *format, ...) {
485 _cleanup_free_ char *p = NULL;
491 va_start(ap, format);
492 r = vasprintf(&p, format, ap);
499 return sd_pid_notify(0, unset_environment, p);
502 _public_ int sd_booted(void) {
505 /* We test whether the runtime unit file directory has been
506 * created. This takes place in mount-setup.c, so is
507 * guaranteed to happen very early during boot. */
509 if (lstat("/run/systemd/system/", &st) < 0)
512 return !!S_ISDIR(st.st_mode);
515 _public_ int sd_watchdog_enabled(int unset_environment, uint64_t *usec) {
516 const char *s, *p = ""; /* p is set to dummy value to do unsetting */
520 s = getenv("WATCHDOG_USEC");
524 r = safe_atou64(s, &u);
532 p = getenv("WATCHDOG_PID");
536 r = parse_pid(p, &pid);
540 /* Is this for us? */
541 if (getpid() != pid) {
553 if (unset_environment && s)
554 unsetenv("WATCHDOG_USEC");
555 if (unset_environment && p)
556 unsetenv("WATCHDOG_PID");