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/*
* Copyright 2010-2017, Tarantool AUTHORS, please see AUTHORS file.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "systemd.h"
#if defined(WITH_NOTIFY_SOCKET)
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "say.h"
static int systemd_fd = -1;
static const char *sd_unix_path = NULL;
int systemd_init(void) {
sd_unix_path = getenv("NOTIFY_SOCKET");
if (sd_unix_path == NULL) {
/* Do nothing if the path is not set. */
return 0;
}
if ((sd_unix_path[0] != '@' && sd_unix_path[0] != '/') ||
(sd_unix_path[1] == '\0')) {
say_error("systemd: NOTIFY_SOCKET contains bad value");
goto error;
}
/* To be sure, that path to unix socket is OK */
struct sockaddr_un sa = {
.sun_family = AF_UNIX,
.sun_path = { '\0' }
};
if (strlen(sd_unix_path) >= sizeof(sa.sun_path)) {
say_error("systemd: NOTIFY_SOCKET is longer than MAX_UNIX_PATH");
goto error;
}
if ((systemd_fd = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) {
say_syserror("systemd: failed to create unix socket");
goto error;
}
if (fcntl(systemd_fd, F_SETFD, FD_CLOEXEC) == -1) {
say_syserror("systemd: fcntl failed to set FD_CLOEXEC");
goto error;
}
#if defined(HAVE_SO_NOSIGPIPE)
int val = 1;
if (setsockopt(systemd_fd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&val,
sizeof(val)) < 0) {
say_syserror("systemd: failed to set NOSIGPIPE");
goto error;
}
#endif
int sndbuf_sz = 4 * 1024 * 1024;
if (setsockopt(systemd_fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_sz,
sizeof(int)) < 0) {
say_syserror("systemd: failed to set sndbuf size");
goto error;
};
return 0;
error:
if (systemd_fd > 0) {
close(systemd_fd);
systemd_fd = -1;
}
sd_unix_path = NULL;
return -1;
}
void systemd_free(void) {
if (systemd_fd > 0)
close(systemd_fd);
}
int systemd_notify(const char *message) {
if (systemd_fd == -1 || sd_unix_path == NULL)
return 0;
struct sockaddr_un sa = {
.sun_family = AF_UNIX,
};
strncpy(sa.sun_path, sd_unix_path, sizeof(sa.sun_path) - 1);
if (sa.sun_path[0] == '@')
sa.sun_path[0] = '\0';
say_debug("systemd: sending message '%s'", message);
int flags = 0;
#if defined(HAVE_MSG_NOSIGNAL)
flags |= MSG_NOSIGNAL;
#endif
ssize_t sent = sendto(systemd_fd, message, (size_t) strlen(message),
flags, (struct sockaddr *) &sa, sizeof(sa));
if (sent == -1) {
say_syserror("systemd: failed to send message");
return -1;
}
return sent;
}
int
systemd_vsnotify(const char *format, va_list ap)
{
if (systemd_fd == -1 || sd_unix_path == NULL)
return 0;
char *buf = NULL;
int rv = vasprintf(&buf, format, ap);
if (rv < 0 || buf == NULL) {
say_syserror("systemd: failed to format string '%s'", format);
return -1;
}
rv = systemd_notify(buf);
free(buf);
return rv;
}
CFORMAT(printf, 1, 2) int
systemd_snotify(const char *format, ...)
{
if (systemd_fd == -1 || sd_unix_path == NULL)
return 0;
va_list args;
va_start(args, format);
size_t res = systemd_vsnotify(format, args);
va_end(args);
return res;
}
#endif /* defined(WITH_NOTIFY_SOCKET) */
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