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_pid_notify_with_fds(pid_t pid, int unset_environment, const char *state, const int *fds, unsigned n_fds) {
311 union sockaddr_union sockaddr = {
312 .sa.sa_family = AF_UNIX,
314 struct iovec iovec = {
315 .iov_base = (char*) state,
317 struct msghdr msghdr = {
320 .msg_name = &sockaddr,
322 _cleanup_close_ int fd = -1;
323 struct cmsghdr *cmsg = NULL;
333 if (n_fds > 0 && !fds) {
338 e = getenv("NOTIFY_SOCKET");
342 /* Must be an abstract socket, or an absolute path */
343 if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
348 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
354 iovec.iov_len = strlen(state);
356 strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
357 if (sockaddr.un.sun_path[0] == '@')
358 sockaddr.un.sun_path[0] = 0;
360 msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
361 if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
362 msghdr.msg_namelen = sizeof(struct sockaddr_un);
364 have_pid = pid != 0 && pid != getpid();
366 if (n_fds > 0 || have_pid) {
367 msghdr.msg_controllen = CMSG_SPACE(sizeof(int) * n_fds) +
368 CMSG_SPACE(sizeof(struct ucred) * have_pid);
369 msghdr.msg_control = alloca(msghdr.msg_controllen);
371 cmsg = CMSG_FIRSTHDR(&msghdr);
373 cmsg->cmsg_level = SOL_SOCKET;
374 cmsg->cmsg_type = SCM_RIGHTS;
375 cmsg->cmsg_len = CMSG_LEN(sizeof(int) * n_fds);
377 memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * n_fds);
380 assert_se(cmsg = CMSG_NXTHDR(&msghdr, cmsg));
386 cmsg->cmsg_level = SOL_SOCKET;
387 cmsg->cmsg_type = SCM_CREDENTIALS;
388 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
390 ucred = (struct ucred*) CMSG_DATA(cmsg);
392 ucred->uid = getuid();
393 ucred->gid = getgid();
397 /* First try with fake ucred data, as requested */
398 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
403 /* If that failed, try with our own ucred instead */
405 msghdr.msg_controllen -= CMSG_SPACE(sizeof(struct ucred));
406 if (msghdr.msg_controllen == 0)
407 msghdr.msg_control = NULL;
409 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) >= 0) {
418 if (unset_environment)
419 unsetenv("NOTIFY_SOCKET");
424 _public_ int sd_pid_notify(pid_t pid, int unset_environment, const char *state) {
425 return sd_pid_notify_with_fds(pid, unset_environment, state, NULL, 0);
428 _public_ int sd_notify(int unset_environment, const char *state) {
429 return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0);
432 _public_ int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...) {
433 _cleanup_free_ char *p = NULL;
439 va_start(ap, format);
440 r = vasprintf(&p, format, ap);
447 return sd_pid_notify(pid, unset_environment, p);
450 _public_ int sd_notifyf(int unset_environment, const char *format, ...) {
451 _cleanup_free_ char *p = NULL;
457 va_start(ap, format);
458 r = vasprintf(&p, format, ap);
465 return sd_pid_notify(0, unset_environment, p);
468 _public_ int sd_booted(void) {
471 /* We test whether the runtime unit file directory has been
472 * created. This takes place in mount-setup.c, so is
473 * guaranteed to happen very early during boot. */
475 if (lstat("/run/systemd/system/", &st) < 0)
478 return !!S_ISDIR(st.st_mode);
481 _public_ int sd_watchdog_enabled(int unset_environment, uint64_t *usec) {
482 const char *s, *p = ""; /* p is set to dummy value to do unsetting */
486 s = getenv("WATCHDOG_USEC");
490 r = safe_atou64(s, &u);
498 p = getenv("WATCHDOG_PID");
502 r = parse_pid(p, &pid);
506 /* Is this for us? */
507 if (getpid() != pid) {
519 if (unset_environment && s)
520 unsetenv("WATCHDOG_USEC");
521 if (unset_environment && p)
522 unsetenv("WATCHDOG_PID");