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#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ev.h>
#include "icmp.h"
#include "pingu.h"
#include "xlib.h"
#include "log.h"
#include "list.h"
#include "pingu_host.h"
#include "pingu_netlink.h"
#ifndef DEFAULT_CONFIG
#define DEFAULT_CONFIG "/etc/pingu/pingu.conf"
#endif
#ifndef DEFAULT_PIDFILE
#define DEFAULT_PIDFILE "/var/run/pingu.pid"
#endif
int pingu_verbose = 0, pid_file_fd = 0, pingu_daemonize = 0;
char *pid_file = DEFAULT_PIDFILE;
static void print_version(const char *program)
{
printf("%s " PINGU_VERSION "\n", program);
}
int usage(const char *program)
{
print_version(program);
fprintf(stderr, "usage: %s [-dh] [-c CONFIG] [-p PIDFILE]\n"
"options:\n"
" -c Read configuration from FILE (default is "
DEFAULT_CONFIG ")\n"
" -d Fork to background (damonize)\n"
" -h Show this help\n"
" -p Use PIDFILE as pidfile (default is "
DEFAULT_PIDFILE ")\n"
" -V Print version and exit\n"
"\n",
program);
return 1;
}
static void remove_pid_file(void)
{
if (pid_file_fd != 0) {
close(pid_file_fd);
pid_file_fd = 0;
remove(pid_file);
}
}
static int daemonize(void)
{
char tmp[16];
pid_t pid;
pid = fork();
if (pid < 0)
return -1;
if (pid > 0)
exit(0);
if (setsid() < 0)
return -1;
pid = fork();
if (pid < 0)
return -1;
if (pid > 0)
exit(0);
if (chdir("/") < 0)
return -1;
pid_file_fd = open(pid_file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
if (pid_file_fd < 0) {
log_error("Unable to open %s: %s.", pid_file, strerror(errno));
return -1;
}
if (flock(pid_file_fd, LOCK_EX | LOCK_NB) < 0) {
log_error("Unable to lock pid file (already running?).");
close(pid_file_fd);
pid_file_fd = 0;
return -1;
}
ftruncate(pid_file_fd, 0);
write(pid_file_fd, tmp, sprintf(tmp, "%d\n", getpid()));
atexit(remove_pid_file);
freopen("/dev/null", "r", stdin);
freopen("/dev/null", "w", stdout);
freopen("/dev/null", "w", stderr);
umask(0);
return 0;
}
int main(int argc, char *argv[])
{
int c;
const char *config_file = DEFAULT_CONFIG;
int verbose = 0;
static struct ev_loop *loop;
while ((c = getopt(argc, argv, "c:dhp:Vv")) != -1) {
switch (c) {
case 'c':
config_file = optarg;
break;
case 'd':
pingu_daemonize++;
break;
case 'h':
return usage(basename(argv[0]));
case 'p':
pid_file = optarg;
break;
case 'V':
print_version(basename(argv[0]));
return 0;
case 'v':
verbose++;
break;
}
}
argc -= optind;
argv += optind;
log_init(verbose);
loop = ev_default_loop(0);
pingu_host_init(loop, config_file);
kernel_init(loop);
if (pingu_daemonize) {
if (daemonize() == -1)
return 1;
}
ev_run(loop, 0);
return 0;
}
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