1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 Copyright 2010 Lennart Poettering
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:
14 The above copyright notice and this permission notice shall be
15 included in all copies or substantial portions of the Software.
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
31 #include <sys/types.h>
33 #include <sys/socket.h>
35 #include <sys/fcntl.h>
36 #include <netinet/in.h>
46 #if defined(__linux__)
50 #include "sd-daemon.h"
52 int sd_listen_fds(int unset_environment) {
54 #if defined(DISABLE_SYSTEMD) || !defined(__linux__)
62 if (!(e = getenv("LISTEN_PID"))) {
68 l = strtoul(e, &p, 10);
75 if (!p || *p || l <= 0) {
81 if (getpid() != (pid_t) l) {
86 if (!(e = getenv("LISTEN_FDS"))) {
92 l = strtoul(e, &p, 10);
104 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) {
107 if ((flags = fcntl(fd, F_GETFD)) < 0) {
112 if (flags & FD_CLOEXEC)
115 if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
124 if (unset_environment) {
125 unsetenv("LISTEN_PID");
126 unsetenv("LISTEN_FDS");
133 int sd_is_fifo(int fd, const char *path) {
139 memset(&st_fd, 0, sizeof(st_fd));
140 if (fstat(fd, &st_fd) < 0)
143 if (!S_ISFIFO(st_fd.st_mode))
149 memset(&st_path, 0, sizeof(st_path));
150 if (stat(path, &st_path) < 0) {
152 if (errno == ENOENT || errno == ENOTDIR)
159 st_path.st_dev == st_fd.st_dev &&
160 st_path.st_ino == st_fd.st_ino;
166 static int sd_is_socket_internal(int fd, int type, int listening) {
169 if (fd < 0 || type < 0)
172 if (fstat(fd, &st_fd) < 0)
175 if (!S_ISSOCK(st_fd.st_mode))
180 socklen_t l = sizeof(other_type);
182 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0)
185 if (l != sizeof(other_type))
188 if (other_type != type)
192 if (listening >= 0) {
194 socklen_t l = sizeof(accepting);
196 if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0)
199 if (l != sizeof(accepting))
202 if (!accepting != !listening)
209 union sockaddr_union {
211 struct sockaddr_in in4;
212 struct sockaddr_in6 in6;
213 struct sockaddr_un un;
214 struct sockaddr_storage storage;
217 int sd_is_socket(int fd, int family, int type, int listening) {
223 if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
227 union sockaddr_union sockaddr;
230 memset(&sockaddr, 0, sizeof(sockaddr));
231 l = sizeof(sockaddr);
233 if (getsockname(fd, &sockaddr.sa, &l) < 0)
236 if (l < sizeof(sa_family_t))
239 return sockaddr.sa.sa_family == family;
245 int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
246 union sockaddr_union sockaddr;
250 if (family != 0 && family != AF_INET && family != AF_INET6)
253 if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
256 memset(&sockaddr, 0, sizeof(sockaddr));
257 l = sizeof(sockaddr);
259 if (getsockname(fd, &sockaddr.sa, &l) < 0)
262 if (l < sizeof(sa_family_t))
265 if (sockaddr.sa.sa_family != AF_INET &&
266 sockaddr.sa.sa_family != AF_INET6)
270 if (sockaddr.sa.sa_family != family)
274 if (sockaddr.sa.sa_family == AF_INET) {
275 if (l < sizeof(struct sockaddr_in))
278 return htons(port) == sockaddr.in4.sin_port;
280 if (l < sizeof(struct sockaddr_in6))
283 return htons(port) == sockaddr.in6.sin6_port;
290 int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
291 union sockaddr_union sockaddr;
295 if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
298 memset(&sockaddr, 0, sizeof(sockaddr));
299 l = sizeof(sockaddr);
301 if (getsockname(fd, &sockaddr.sa, &l) < 0)
304 if (l < sizeof(sa_family_t))
307 if (sockaddr.sa.sa_family != AF_UNIX)
312 length = strlen(path);
316 return l == offsetof(struct sockaddr_un, sun_path);
319 /* Normal path socket */
321 (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) &&
322 memcmp(path, sockaddr.un.sun_path, length+1) == 0;
324 /* Abstract namespace socket */
326 (l == offsetof(struct sockaddr_un, sun_path) + length) &&
327 memcmp(path, sockaddr.un.sun_path, length) == 0;
333 int sd_is_mq(int fd, const char *path) {
334 #if !defined(__linux__)
342 if (mq_getattr(fd, &attr) < 0)
346 char fpath[PATH_MAX];
352 if (fstat(fd, &a) < 0)
355 strncpy(stpcpy(fpath, "/dev/mqueue"), path, sizeof(fpath) - 12);
356 fpath[sizeof(fpath)-1] = 0;
358 if (stat(fpath, &b) < 0)
361 if (a.st_dev != b.st_dev ||
362 a.st_ino != b.st_ino)
370 int sd_notify(int unset_environment, const char *state) {
371 #if defined(DISABLE_SYSTEMD) || !defined(__linux__) || !defined(SOCK_CLOEXEC)
375 struct msghdr msghdr;
377 union sockaddr_union sockaddr;
385 if (!(e = getenv("NOTIFY_SOCKET")))
388 /* Must be an abstract socket, or an absolute path */
389 if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
394 if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
399 memset(&sockaddr, 0, sizeof(sockaddr));
400 sockaddr.sa.sa_family = AF_UNIX;
401 strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
403 if (sockaddr.un.sun_path[0] == '@')
404 sockaddr.un.sun_path[0] = 0;
406 memset(&iovec, 0, sizeof(iovec));
407 iovec.iov_base = (char*) state;
408 iovec.iov_len = strlen(state);
410 memset(&msghdr, 0, sizeof(msghdr));
411 msghdr.msg_name = &sockaddr;
412 msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
414 if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
415 msghdr.msg_namelen = sizeof(struct sockaddr_un);
417 msghdr.msg_iov = &iovec;
418 msghdr.msg_iovlen = 1;
420 if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
428 if (unset_environment)
429 unsetenv("NOTIFY_SOCKET");
438 int sd_notifyf(int unset_environment, const char *format, ...) {
439 #if defined(DISABLE_SYSTEMD) || !defined(__linux__)
446 va_start(ap, format);
447 r = vasprintf(&p, format, ap);
453 r = sd_notify(unset_environment, p);
460 int sd_booted(void) {
461 #if defined(DISABLE_SYSTEMD) || !defined(__linux__)
467 /* We simply test whether the systemd cgroup hierarchy is
470 if (lstat("/sys/fs/cgroup", &a) < 0)
473 if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
476 return a.st_dev != b.st_dev;