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// SPDX-License-Identifier: GPL-2.0-or-later
/* lib/systemd Code
* Copyright (C) 2016 Cumulus Networks, Inc.
* Donald Sharp
*/
#include <zebra.h>
#include <sys/stat.h>
#include <sys/un.h>
#include "frrevent.h"
#include "systemd.h"
#include "lib_errors.h"
/* these are cleared from env so they don't "leak" into things we fork(),
* particularly for watchfrr starting individual daemons
*
* watchdog_pid is currently not used since watchfrr starts forking.
* (TODO: handle that better, somehow?)
*/
static pid_t watchdog_pid = -1;
static intmax_t watchdog_msec;
/* not used yet, but can trigger auto-switch to journald logging */
bool sd_stdout_is_journal;
bool sd_stderr_is_journal;
static char *notify_socket;
/* talk to whatever entity claims to be systemd ;)
*
* refer to sd_notify docs for messages systemd accepts over this socket.
* This function should be functionally equivalent to sd_notify().
*/
static void systemd_send_information(const char *info)
{
int sock;
struct sockaddr_un sun;
if (!notify_socket)
return;
sock = socket(AF_UNIX, SOCK_DGRAM, 0);
if (sock < 0)
return;
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, notify_socket, sizeof(sun.sun_path));
/* linux abstract unix socket namespace */
if (sun.sun_path[0] == '@')
sun.sun_path[0] = '\0';
/* nothing we can do if this errors out... */
(void)sendto(sock, info, strlen(info), 0, (struct sockaddr *)&sun,
sizeof(sun));
close(sock);
}
void systemd_send_stopping(void)
{
systemd_send_information("STATUS=");
systemd_send_information("STOPPING=1");
}
static struct event_loop *systemd_master = NULL;
static void systemd_send_watchdog(struct event *t)
{
systemd_send_information("WATCHDOG=1");
assert(watchdog_msec > 0);
event_add_timer_msec(systemd_master, systemd_send_watchdog, NULL,
watchdog_msec, NULL);
}
void systemd_send_started(struct event_loop *m)
{
assert(m != NULL);
systemd_master = m;
systemd_send_information("READY=1");
if (watchdog_msec > 0)
systemd_send_watchdog(NULL);
}
void systemd_send_status(const char *status)
{
char buffer[1024];
snprintf(buffer, sizeof(buffer), "STATUS=%s", status);
systemd_send_information(buffer);
}
static intmax_t getenv_int(const char *varname, intmax_t dflt)
{
char *val, *err;
intmax_t intval;
val = getenv(varname);
if (!val)
return dflt;
intval = strtoimax(val, &err, 0);
if (*err || !*val)
return dflt;
return intval;
}
void systemd_init_env(void)
{
char *tmp;
uintmax_t dev, ino;
int len;
struct stat st;
notify_socket = getenv("NOTIFY_SOCKET");
/* no point in setting up watchdog w/o notify socket */
if (notify_socket) {
intmax_t watchdog_usec;
watchdog_pid = getenv_int("WATCHDOG_PID", -1);
if (watchdog_pid <= 0)
watchdog_pid = -1;
/* note this is the deadline, hence the divide by 3 */
watchdog_usec = getenv_int("WATCHDOG_USEC", 0);
if (watchdog_usec >= 3000)
watchdog_msec = watchdog_usec / 3000;
else {
if (watchdog_usec != 0)
flog_err(
EC_LIB_UNAVAILABLE,
"systemd expects a %jd microsecond watchdog timer, but FRR only supports millisecond resolution!",
watchdog_usec);
watchdog_msec = 0;
}
}
tmp = getenv("JOURNAL_STREAM");
if (tmp && sscanf(tmp, "%ju:%ju%n", &dev, &ino, &len) == 2
&& (size_t)len == strlen(tmp)) {
if (fstat(1, &st) == 0 && st.st_dev == (dev_t)dev
&& st.st_ino == (ino_t)ino)
sd_stdout_is_journal = true;
if (fstat(2, &st) == 0 && st.st_dev == (dev_t)dev
&& st.st_ino == (ino_t)ino)
sd_stderr_is_journal = true;
}
/* these should *not* be passed to any other process we start */
unsetenv("WATCHDOG_PID");
unsetenv("WATCHDOG_USEC");
}
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