sammler/sammler.c

/***************************************************************************
 *   Copyright (C) 06/2006 by Olaf Rempel                                  *
 *   razzor@kopf-tisch.de                                                  *
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 *   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.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <signal.h>

#include "configfile.h"
#include "logging.h"
#include "network.h"
#include "plugins.h"

#define DEFAULT_CONFIG "sammler.conf"
#define DEFAULT_LOGFILE "sammler.log"

static struct option opts[] = {
	{"config",	1, 0, 'c'},
	{"debug",	0, 0, 'd'},
	{"help",	0, 0, 'h'},
	{0, 0, 0, 0}
};

int main(int argc, char *argv[])
{
	char *config = DEFAULT_CONFIG;
	int code, arg = 0, debug = 0;

	do {
		code = getopt_long(argc, argv, "c:dh", opts, &arg);

		switch (code) {
		case 'c':	/* config */
				config = optarg;
				break;

		case 'd':	/* debug */
				debug = 1;
				break;

		case 'h':	/* help */
				printf("Usage: sammler [options]\n"
					"Options: \n"
					"  --config       -c  configfile  use this configfile\n"
					"  --debug        -d              do not fork and log to stderr\n"
					"  --help         -h              this help\n"
					"\n");
				exit(0);
				break;

		case '?':	/* error */
				exit(-1);
				break;

		default:	/* unknown / all options parsed */
				break;
		}
	} while (code != -1);

	/* parse config file */
	if (!config_parse(config))
		exit(-1);

	/* check logfile */
	char *logfile = config_get_string("global", "logfile", DEFAULT_LOGFILE);
	if (logfile != NULL && debug == 0) {
		/* start logging */
		if (!log_init(logfile))
			exit(-1);

		/* zum daemon mutieren */
		daemon(-1, 0);
	}

	char *hostname = config_get_string("global", "hostname", "localhost");
	log_print(LOG_EVERYTIME, "sammler (pid:%d) started on host '%s'", getpid(), hostname);

	fd_set fdsel, fdcpy;
	FD_ZERO(&fdsel);

	int srv_sock = net_init_srv();
	if (srv_sock != -1)
		FD_SET(srv_sock, &fdsel);

	int probe_flags = 0;
	if (net_init_cli())
		probe_flags |= PLUGIN_NET;

	char *fwd_only = config_get_string("global", "forward_only", NULL);
	if (fwd_only == NULL || strncmp(fwd_only, "true", 4))
		probe_flags |= PLUGIN_RRD;

	plugin_init(probe_flags);

	struct timeval tv;
	tv.tv_sec = 0;
	tv.tv_usec = 0;

	while (1) {
		memcpy(&fdcpy, &fdsel, sizeof(fdsel));

		int i = select(FD_SETSIZE, &fdcpy, NULL, NULL, &tv);
		if (i == -1) {
			log_print(LOG_ERROR, "select()");

		/* timeout */
		} else if (i == 0) {
			plugins_probe();
			tv.tv_sec = 1;
			tv.tv_usec = 0;

		} else if (FD_ISSET(srv_sock, &fdsel)) {
			net_receive(srv_sock);
		}
	}

	return 0;
}