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/*
* Module: main.cc
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <signal.h>
#include <syslog.h>
#include <stdio.h>
#include "stdlib.h"
#include <unistd.h>
#include <iostream>
#include <unistd.h>
#include "loadbalance.hh"
bool g_check_path = false;
LoadBalance *g_lb = NULL;
pid_t pid_output (const char *path);
static void usage()
{
cout << "lb -ftviodh" << endl;
cout << " -f [file] configuration file" << endl;
cout << " -t load configuration file only and exit" << endl;
cout << " -v print debug output" << endl;
cout << " -i specify location of pid directory" << endl;
cout << " -o specify location of output directory" << endl;
cout << " -d run as daemon" << endl;
cout << " -h help" << endl;
}
static void sig_end(int signo)
{
if (g_lb)
delete g_lb;
cerr << "End signal: " << signo << endl;
syslog(LOG_ERR, "wan_lb, exit signal caught, exiting..");
exit(0);
}
static void sig_user1(int signo)
{
if (g_lb)
delete g_lb;
cerr << "User signal: " << signo << endl;
syslog(LOG_ERR, "wan_lb, user exit signal caught, exiting..");
exit(0);
}
static void sig_user2(int signo)
{
//used to wake up the process to check paths
g_check_path = true;
cerr << "User signal: " << signo << endl;
syslog(LOG_ERR, "wan_lb, rechecking interfaces..");
}
int main(int argc, char* argv[])
{
int ch;
bool debug = false;
bool config_debug_mode = false, daemon = false;
string pid_path = "/var/run";
string output_path = "/var/run/load-balance";
string c_file;
//grab inputs
while ((ch = getopt(argc, argv, "f:hti:o:dv")) != -1) {
switch (ch) {
case 'f':
c_file = optarg;
break;
case 'h':
usage();
exit(0);
case 't':
config_debug_mode = true;
break;
case 'i':
pid_path = optarg;
break;
case 'o':
output_path = optarg;
break;
case 'd':
daemon = true;
break;
case 'v':
debug = true;
break;
default:
usage();
exit(0);
}
}
//parse conf file
if (c_file.empty()) {
cout << "Configuration file is empty" << endl;
exit(0);
}
int s = 0;
if (daemon) {
if (fork() != 0) {
wait(&s);
exit(0);
}
}
if (pid_path.empty() == false) {
pid_output(pid_path.c_str());
}
g_lb = new LoadBalance(debug, output_path);
bool success = g_lb->set_conf(c_file);
if (success == false) {
syslog(LOG_ERR, "wan_lb: error loading configuration file: %s", c_file.c_str());
exit(0);
}
if (config_debug_mode) {
exit(0);
}
if (debug) {
cout << "STARTING CYCLE" << endl;
}
g_lb->init();
//signal handler here
// sighup...
signal(SIGINT, sig_end);
signal(SIGTERM, sig_end);
signal(SIGUSR1, sig_user1);
signal(SIGUSR2, sig_user2);
//drop into event loop
do {
if (debug) {
cout << "main.cc: starting new cycle" << endl;
}
//check interface address and nexthop
if (g_check_path == true) {
g_lb->update_paths();
g_check_path = false;
}
//health test
g_lb->health_test();
//apply rules
g_lb->apply_rules();
//update show output
g_lb->output();
g_lb->sleep();
} while (g_lb->start_cycle());
if (g_lb) {
delete g_lb;
}
exit(0);
}
/**
*
*below borrowed from quagga library.
**/
#define PIDFILE_MASK 0644
pid_t
pid_output (const char *path)
{
FILE *fp;
pid_t pid;
mode_t oldumask;
pid = getpid();
oldumask = umask(0777 & ~PIDFILE_MASK);
fp = fopen (path, "w");
if (fp != NULL)
{
fprintf (fp, "%d\n", (int) pid);
fclose (fp);
umask(oldumask);
return pid;
}
/* XXX Why do we continue instead of exiting? This seems incompatible
with the behavior of the fcntl version below. */
syslog(LOG_ERR,"Can't fopen pid lock file %s, continuing",
path);
umask(oldumask);
return -1;
}
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