wstart.c

wdiag-0.10.gz ( Diagnostic source )

/* Westell 6100 multicast data collection utility
 * to start the multicast stream.
 *
 * Copyright: Josh Carroll ([e-mail])
 * 10/13/2004
 *
 * wstart.c 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, version 2.
 * 
 * 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 "wstart.h"

extern wmodel_t models[];

/* main program */
int main(int argc, char *argv[]) {

	uid_t id;

	/* model number and/or broadcast passed on the command line */
	int model_number = -1,i,gopt;
	char *bcast = NULL;

	/* packet model struct */
	pmodel_t model;
	/* to hold the current packet info */
	wpacket_t curr_pkt;

	/* for the config file */	
	wconf_t conf;

	/* first look to see if the person has a config file. if so, use
		any values specified there */
	if(read_config(&conf) == 0) {
		model_number = conf.model;
		bcast = conf.bcast;
	}

	/* requires the modem type */
	if( (model_number == -1 && bcast == NULL) && argv[1] == NULL) {
		printf("Usage: %s -m <model> [-b <broadcast addr>]\n", argv[0]);
		printf("Valid models:\n");
		for(i=0; i <= MAX_MODEL_NUMBER; i++) {
			printf("\t%d\t%s\n", i, pmodels[i].model_number);
		}
		exit(1);
	}

	/* use getopt to get command line arguments */
	while((gopt = getopt(argc, argv, "m:b:")) != EOF) {
		switch (gopt) {
			case 'm':
				model_number = atoi(optarg);
				break;
			case 'b':
				bcast = malloc(sizeof(char) * strlen(optarg));
				strcpy(bcast, optarg);
				break;
		}
	}

	if(model_number == -1) {
		printf("Usage: %s -m <model> [-b <broadcast addr>]\n", argv[0]);
		printf("Valid models:\n");
		for(i=0; i <= MAX_MODEL_NUMBER; i++) {
			printf("\t%d\t%s\n", i, pmodels[i].model_number);
		}
		/* cleanup before we exit */
		wfree(bcast);
		exit(1);
	}

	/* check for valid modem model number */
	if(model_number < 0 || model_number > MAX_MODEL_NUMBER) {
		printf("Invalid model type! Valid models:\n");
		for(i=0; i <= MAX_MODEL_NUMBER; i++) {
			printf("\t%d\t%s\n", i, pmodels[i].model_number);
		}
		/* cleanup before we exit */
		wfree(bcast);
		exit(1);
	}

	/* assign the model */
	model = pmodels[model_number];

	/* if they specified a broadcast, update the model struct
	 * values to reflect the changes */
	if(bcast != NULL) {
		strcpy(model.broadcast_ip, bcast);
		/* free the bcast buffer */
		wfree(bcast);
	}

	/* since we are sending a raw IGMP packet, require root */
	id = geteuid();
	if(id != 0) {
		printf("You must be root to execute this program.\n");
		exit(1);
	}

	/* send the udp packets to init the modem */
	for(i=0; i <= model.num_packets-1; i++) {
		curr_pkt = model.packets[i];
		send_packet(&curr_pkt,model.broadcast_ip);
		/* the older westell models cannot respond when the udp
		 * packets are sent too quickly, so sleep 500ms between
		 * each udp packet send. newer models are compatible. */
		usleep(500000);
	}

	/* subscribe to the multicast group */
	for(i=0; i < model.num_mcasts; i++) {
		multicast_subscribe(model.multicasts[i].mcast_dest,
				model.multicasts[i].mcast_group);
		usleep(500000);
	}

	return 0;
}