implement "socket activation": passing IPC sockets to i3
This commit is contained in:
Michael Stapelberg
436
src/sd-daemon.c
Normal file
436
src/sd-daemon.c
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@ -0,0 +1,436 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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Copyright 2010 Lennart Poettering
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation files
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(the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of the Software,
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and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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***/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/fcntl.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stddef.h>
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#include "sd-daemon.h"
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int sd_listen_fds(int unset_environment) {
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#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
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return 0;
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#else
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int r, fd;
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const char *e;
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char *p = NULL;
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unsigned long l;
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if (!(e = getenv("LISTEN_PID"))) {
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r = 0;
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goto finish;
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}
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errno = 0;
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l = strtoul(e, &p, 10);
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if (errno != 0) {
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r = -errno;
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goto finish;
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}
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if (!p || *p || l <= 0) {
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r = -EINVAL;
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goto finish;
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}
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/* Is this for us? */
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if (getpid() != (pid_t) l) {
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r = 0;
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goto finish;
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}
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if (!(e = getenv("LISTEN_FDS"))) {
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r = 0;
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goto finish;
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}
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errno = 0;
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l = strtoul(e, &p, 10);
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if (errno != 0) {
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r = -errno;
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goto finish;
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}
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if (!p || *p) {
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r = -EINVAL;
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goto finish;
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}
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for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) {
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int flags;
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if ((flags = fcntl(fd, F_GETFD)) < 0) {
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r = -errno;
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goto finish;
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}
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if (flags & FD_CLOEXEC)
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continue;
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if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
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r = -errno;
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goto finish;
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}
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}
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r = (int) l;
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finish:
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if (unset_environment) {
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unsetenv("LISTEN_PID");
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unsetenv("LISTEN_FDS");
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}
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return r;
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#endif
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}
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int sd_is_fifo(int fd, const char *path) {
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struct stat st_fd;
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if (fd < 0)
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return -EINVAL;
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memset(&st_fd, 0, sizeof(st_fd));
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if (fstat(fd, &st_fd) < 0)
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return -errno;
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if (!S_ISFIFO(st_fd.st_mode))
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return 0;
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if (path) {
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struct stat st_path;
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memset(&st_path, 0, sizeof(st_path));
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if (stat(path, &st_path) < 0) {
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if (errno == ENOENT || errno == ENOTDIR)
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return 0;
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return -errno;
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}
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return
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st_path.st_dev == st_fd.st_dev &&
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st_path.st_ino == st_fd.st_ino;
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}
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return 1;
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}
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static int sd_is_socket_internal(int fd, int type, int listening) {
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struct stat st_fd;
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if (fd < 0 || type < 0)
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return -EINVAL;
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if (fstat(fd, &st_fd) < 0)
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return -errno;
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if (!S_ISSOCK(st_fd.st_mode))
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return 0;
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if (type != 0) {
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int other_type = 0;
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socklen_t l = sizeof(other_type);
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if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0)
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return -errno;
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if (l != sizeof(other_type))
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return -EINVAL;
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if (other_type != type)
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return 0;
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}
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if (listening >= 0) {
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int accepting = 0;
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socklen_t l = sizeof(accepting);
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if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0)
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return -errno;
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if (l != sizeof(accepting))
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return -EINVAL;
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if (!accepting != !listening)
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return 0;
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}
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return 1;
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}
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union sockaddr_union {
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struct sockaddr sa;
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struct sockaddr_in in4;
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struct sockaddr_in6 in6;
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struct sockaddr_un un;
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struct sockaddr_storage storage;
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};
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int sd_is_socket(int fd, int family, int type, int listening) {
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int r;
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if (family < 0)
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return -EINVAL;
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if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
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return r;
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if (family > 0) {
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union sockaddr_union sockaddr;
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socklen_t l;
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memset(&sockaddr, 0, sizeof(sockaddr));
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l = sizeof(sockaddr);
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if (getsockname(fd, &sockaddr.sa, &l) < 0)
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return -errno;
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if (l < sizeof(sa_family_t))
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return -EINVAL;
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return sockaddr.sa.sa_family == family;
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}
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return 1;
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}
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int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
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union sockaddr_union sockaddr;
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socklen_t l;
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int r;
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if (family != 0 && family != AF_INET && family != AF_INET6)
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return -EINVAL;
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if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
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return r;
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memset(&sockaddr, 0, sizeof(sockaddr));
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l = sizeof(sockaddr);
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if (getsockname(fd, &sockaddr.sa, &l) < 0)
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return -errno;
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if (l < sizeof(sa_family_t))
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return -EINVAL;
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if (sockaddr.sa.sa_family != AF_INET &&
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sockaddr.sa.sa_family != AF_INET6)
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return 0;
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if (family > 0)
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if (sockaddr.sa.sa_family != family)
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return 0;
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if (port > 0) {
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if (sockaddr.sa.sa_family == AF_INET) {
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if (l < sizeof(struct sockaddr_in))
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return -EINVAL;
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return htons(port) == sockaddr.in4.sin_port;
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} else {
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if (l < sizeof(struct sockaddr_in6))
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return -EINVAL;
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return htons(port) == sockaddr.in6.sin6_port;
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}
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}
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return 1;
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}
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int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
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union sockaddr_union sockaddr;
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socklen_t l;
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int r;
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if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
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return r;
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memset(&sockaddr, 0, sizeof(sockaddr));
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l = sizeof(sockaddr);
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if (getsockname(fd, &sockaddr.sa, &l) < 0)
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return -errno;
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if (l < sizeof(sa_family_t))
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return -EINVAL;
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if (sockaddr.sa.sa_family != AF_UNIX)
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return 0;
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if (path) {
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if (length <= 0)
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length = strlen(path);
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if (length <= 0)
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/* Unnamed socket */
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return l == offsetof(struct sockaddr_un, sun_path);
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if (path[0])
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/* Normal path socket */
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return
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(l >= offsetof(struct sockaddr_un, sun_path) + length + 1) &&
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memcmp(path, sockaddr.un.sun_path, length+1) == 0;
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else
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/* Abstract namespace socket */
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return
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(l == offsetof(struct sockaddr_un, sun_path) + length) &&
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memcmp(path, sockaddr.un.sun_path, length) == 0;
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}
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return 1;
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}
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int sd_notify(int unset_environment, const char *state) {
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#if defined(DISABLE_SYSTEMD) || !defined(__linux__) || !defined(SOCK_CLOEXEC)
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return 0;
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#else
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int fd = -1, r;
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struct msghdr msghdr;
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struct iovec iovec;
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union sockaddr_union sockaddr;
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const char *e;
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if (!state) {
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r = -EINVAL;
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goto finish;
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}
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if (!(e = getenv("NOTIFY_SOCKET")))
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return 0;
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/* Must be an abstract socket, or an absolute path */
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if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
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r = -EINVAL;
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goto finish;
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}
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if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
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r = -errno;
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goto finish;
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}
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memset(&sockaddr, 0, sizeof(sockaddr));
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sockaddr.sa.sa_family = AF_UNIX;
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strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
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if (sockaddr.un.sun_path[0] == '@')
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sockaddr.un.sun_path[0] = 0;
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memset(&iovec, 0, sizeof(iovec));
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iovec.iov_base = (char*) state;
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iovec.iov_len = strlen(state);
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memset(&msghdr, 0, sizeof(msghdr));
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msghdr.msg_name = &sockaddr;
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msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
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if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
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msghdr.msg_namelen = sizeof(struct sockaddr_un);
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msghdr.msg_iov = &iovec;
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msghdr.msg_iovlen = 1;
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if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
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r = -errno;
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goto finish;
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}
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r = 1;
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finish:
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if (unset_environment)
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unsetenv("NOTIFY_SOCKET");
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if (fd >= 0)
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close(fd);
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return r;
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#endif
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}
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int sd_notifyf(int unset_environment, const char *format, ...) {
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#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
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return 0;
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#else
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va_list ap;
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char *p = NULL;
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int r;
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va_start(ap, format);
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r = vasprintf(&p, format, ap);
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va_end(ap);
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if (r < 0 || !p)
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return -ENOMEM;
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r = sd_notify(unset_environment, p);
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free(p);
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return r;
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#endif
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}
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int sd_booted(void) {
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#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
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return 0;
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#else
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struct stat a, b;
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/* We simply test whether the systemd cgroup hierarchy is
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* mounted */
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if (lstat("/sys/fs/cgroup", &a) < 0)
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return 0;
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if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
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return 0;
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return a.st_dev != b.st_dev;
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#endif
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}
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