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/* SPDX-License-Identifier: MIT-0 */
/* Implement the systemd notify protocol without external dependencies.
* Supports both readiness notification on startup and on reloading,
* according to the protocol defined at:
* https://www.freedesktop.org/software/systemd/man/latest/sd_notify.html
* This protocol is guaranteed to be stable as per:
* https://systemd.io/PORTABILITY_AND_STABILITY/
*
*/
#include <errno.h>
#include <inttypes.h>
#include <signal.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>
#include <stdarg.h>
#include <haproxy/tools.h>
/*
* standalone reimplementation of sd_notify from the libsystemd
* Return:
* -errno in case of error
* 0 when ignored
* >0 when succeeded
*
* Will send <message> over the NOTIFY_SOCKET.
* When unset_environement is set, unsetenv NOTIFY_SOCKET.
*/
int sd_notify(int unset_environment, const char *message)
{
union sockaddr_union {
struct sockaddr sa;
struct sockaddr_un sun;
} socket_addr = {
.sun.sun_family = AF_UNIX,
};
int ret = 1;
int fd = -1;
size_t path_length, message_length;
const char *socket_path;
ssize_t written;
socket_path = getenv("NOTIFY_SOCKET");
if (!socket_path) {
ret = 0; /* Not running under systemd? Nothing to do */
goto end;
}
if (unset_environment)
unsetenv("NOTIFY_SOCKET");
if (!message) {
ret = -EINVAL;
goto end;
}
message_length = strlen(message);
if (message_length == 0) {
ret = -EINVAL;
goto end;
}
/* Only AF_UNIX is supported, with path or abstract sockets */
if (socket_path[0] != '/' && socket_path[0] != '@') {
ret = -EAFNOSUPPORT;
goto end;
}
path_length = strlen(socket_path);
/* Ensure there is room for NUL byte */
if (path_length >= sizeof(socket_addr.sun.sun_path)) {
ret = -E2BIG;
goto end;
}
memcpy(socket_addr.sun.sun_path, socket_path, path_length);
/* Support for abstract socket */
if (socket_addr.sun.sun_path[0] == '@')
socket_addr.sun.sun_path[0] = 0;
fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
if (fd < 0) {
ret = -errno;
goto end;
}
if (connect(fd, &socket_addr.sa, offsetof(struct sockaddr_un, sun_path) + path_length) != 0) {
ret = -errno;
goto end;
}
written = write(fd, message, message_length);
if (written != (ssize_t) message_length) {
ret = written < 0 ? -errno : -EPROTO;
goto end;
}
end:
if (fd > -1)
close(fd);
return ret; /* Notified! */
}
/* va_args variant of sd_notify */
int sd_notifyf(int unset_environment, const char *format, ...)
{
int r;
va_list args;
char *strp = NULL;
va_start(args, format);
strp = memvprintf(&strp, format, args);
va_end(args);
if (strp == NULL) {
r = -ENOMEM;
goto end;
}
r = sd_notify(unset_environment, strp);
free(strp);
end:
return r;
}
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