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/*
* Copyright (c) 2018
* Broadcom Corporation
* All Rights Reserved.
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution. Neither the name of the Broadcom nor the names of
* contributors may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USEn,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Author Robert J. McMahon, Broadcom LTD
* Date April 2016
*
* IGMP 2 querier that can be controlled remotely
*
* Author Robert J. McMahon (rmcmahon)
* Last modified: 06/25/2010
*
* $Copyright Open Broadcom Corporation$
*
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <strings.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <arpa/inet.h>
#include "headers.h"
#define IGMP_HEADER_SIZE 8
void sigint();
void siguser();
void sigalrm();
static int querier_sent_count = 0;
static int sendcount = 0;
static short daemonmode = 0;
static char mcast_queryaddr[20] = "224.0.0.1";
static int send_igmp_allhosts_querier (char *);
int main (int argc, char **argv) {
char *tvalue = NULL;
char *cvalue = NULL;
int c;
int queryinterval;
int pid;
opterr = 0;
while ((c = getopt (argc, argv, "c:dg:t:")) != -1) {
switch (c) {
case 'c':
cvalue = optarg;
break;
case 'g' :
strcpy(mcast_queryaddr, optarg);
break;
case 't':
tvalue = optarg;
break;
case 'd':
daemonmode = 1;
break;
case '?':
if (optopt == 't')
fprintf (stderr, "Option -%c requires an integer argument.\n", optopt);
else if (optopt == 'c')
fprintf (stderr, "Option -%c requires an integer argument.\n", optopt);
else if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr,
"Unknown option character `\\x%x'.\n",
optopt);
default:
fprintf(stderr,"Usage -c <count>, -d daemon, -g <group>, -t <period in seconds>\n");
exit(-1);
}
}
if (tvalue != NULL) {
queryinterval = atoi(tvalue);
} else {
queryinterval = 0;
}
if (cvalue != NULL) {
sendcount = atoi(cvalue);
if (tvalue == NULL)
queryinterval = 0;
} else {
sendcount = 1;
}
signal(SIGINT, sigint);
signal(SIGUSR1, siguser);
signal(SIGALRM, sigalrm);
pid = (int) getpid();
if (daemonmode) {
if (tvalue != NULL) {
sendcount = 1;
printf("IGMP All Hosts Querier (pid=%d) started as a daemon with interval of %d seconds to %s\n", pid, queryinterval, mcast_queryaddr);
} else {
sendcount = 0;
printf("IGMP All Hosts Querier (pid=%d) to %s started as a daemon only\n", pid, mcast_queryaddr);
}
} else {
printf("IGMP All Hosts Querier (pid=%d) sending %d reports with interval of %d seconds\n", pid, sendcount, queryinterval);
}
fflush(stdout);
while (daemonmode || sendcount) {
if (sendcount-- > 0) {
send_igmp_allhosts_querier(mcast_queryaddr);
}
if (queryinterval) {
alarm(queryinterval);
pause();
}
if (daemonmode && sendcount <= 0)
pause();
}
}
void sigint (void) {
exit(0);
}
void siguser (void) {
if (!send_igmp_allhosts_querier(mcast_queryaddr)) {
exit (-1);
}
}
void sigalrm (void) {
if (daemonmode)
sendcount++;
}
static int send_igmp_allhosts_querier (char *mcast_queryaddr) {
int sid=0;
int rc;
char buf[IGMP_HEADER_SIZE];
unsigned int ttl=1;
char type = 17;
char maxresptime = 1;
// unsigned int groupaddr = 0;
char checksum_upper = 0xee;
char checksum_lower = 0xfe;
struct sockaddr_in msock;
const time_t timer = time(NULL);
bzero (&buf, sizeof(buf));
/*
* Note: with byte writes shouldn't need to worry about network/host
* byte ordering, though should double check on non intel system
*/
buf[0] = type;
buf[1] = maxresptime;
buf[2] = checksum_upper;
buf[3] = checksum_lower;
bzero (&msock, sizeof(msock));
msock.sin_family = AF_INET;
inet_pton(AF_INET, mcast_queryaddr, &msock.sin_addr);
setuid(geteuid());
sid = socket(AF_INET, SOCK_RAW, IPPROTO_IGMP);
if (sid != -1) {
rc = setsockopt(sid, IPPROTO_IP, IP_TTL, (char *) &ttl, sizeof(ttl));
if (rc != -1) {
rc = sendto(sid, &buf, IGMP_HEADER_SIZE, 0, (const struct sockaddr *) &msock, sizeof(msock));
if (rc == -1) {
fprintf(stderr, "IGMP Query sendto error = %s\n", strerror(errno));
}
} else {
fprintf(stderr, "IGMP Query setsockopt error = %s\n", strerror(errno));
}
} else {
fprintf(stderr, "IGMP Query, socket error = %s\n", strerror(errno));
}
if (sid > 0) {
close(sid);
rc=1;
} else {
rc = 0;
}
setuid(getuid());
if (rc) {
printf("Sent IGMP all hosts querier to %s (count = %d) at %s",mcast_queryaddr, ++querier_sent_count, ctime(&timer));
fflush(stdout);
}
return rc;
}
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