/*
* Soft: Keepalived is a failover program for the LVS project
* <www.linuxvirtualserver.org>. It monitor & manipulate
* a loadbalanced server pool using multi-layer checks.
*
* Part: pidfile utility.
*
* Author: Alexandre Cassen, <acassen@linux-vs.org>
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Copyright (C) 2001-2017 Alexandre Cassen, <acassen@gmail.com>
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "logger.h"
#include "pidfile.h"
#include "main.h"
#include "bitops.h"
#include "utils.h"
const char *pid_directory = PID_DIR PACKAGE;
/* Create the directory for non-standard pid files */
void
create_pid_dir(void)
{
if (mkdir(pid_directory, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) && errno != EEXIST) {
log_message(LOG_INFO, "Unable to create directory %s", pid_directory);
return;
}
}
void
remove_pid_dir(void)
{
if (rmdir(pid_directory) && errno != ENOTEMPTY && errno != EBUSY)
log_message(LOG_INFO, "unlink of %s failed - error (%d) '%s'", pid_directory, errno, strerror(errno));
}
/* Create the running daemon pidfile */
int
pidfile_write(const char *pid_file, int pid)
{
FILE *pidfile = NULL;
int pidfd = open(pid_file, O_NOFOLLOW | O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (pidfd != -1) pidfile = fdopen(pidfd, "w");
if (!pidfile) {
log_message(LOG_INFO, "pidfile_write : Cannot open %s pidfile",
pid_file);
return 0;
}
fprintf(pidfile, "%d\n", pid);
fclose(pidfile);
return 1;
}
/* Remove the running daemon pidfile */
void
pidfile_rm(const char *pid_file)
{
unlink(pid_file);
}
/* return the daemon running state */
static int
process_running(const char *pid_file)
{
FILE *pidfile = fopen(pid_file, "r");
pid_t pid = 0;
int ret;
/* No pidfile */
if (!pidfile)
return 0;
ret = fscanf(pidfile, "%d", &pid);
fclose(pidfile);
if (ret != 1) {
log_message(LOG_INFO, "Error reading pid file %s", pid_file);
pid = 0;
pidfile_rm(pid_file);
}
/* What should we return - we don't know if it is running or not. */
if (!pid)
return 1;
/* If no process is attached to pidfile, remove it */
if (kill(pid, 0)) {
log_message(LOG_INFO, "Remove a zombie pid file %s", pid_file);
pidfile_rm(pid_file);
return 0;
}
return 1;
}
/* Return parent process daemon state */
bool
keepalived_running(unsigned long mode)
{
if (process_running(main_pidfile))
return true;
#ifdef _WITH_VRRP_
if (__test_bit(DAEMON_VRRP, &mode) && process_running(vrrp_pidfile))
return true;
#endif
#ifdef _WITH_LVS_
if (__test_bit(DAEMON_CHECKERS, &mode) && process_running(checkers_pidfile))
return true;
#endif
#ifdef _WITH_BFD_
if (__test_bit(DAEMON_BFD, &mode) && process_running(bfd_pidfile))
return true;
#endif
return false;
}