igmp multicast test client

/* Receiver/client multicast Datagram example. */
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

struct sockaddr_in localSock;
struct ip_mreq group;
int sd;
int datalen;
char databuf[1024];
struct tm *old, *new;
       time_t tloc, newtloc;

int main(int argc, char *argv[])
{
/* Create a datagram socket on which to receive. */
sd = socket(AF_INET, SOCK_DGRAM, 0);
if(sd < 0)
{
perror("Opening datagram socket error");
exit(1);
}
else
printf("Opening datagram socket....OK.\n");

/* Enable SO_REUSEADDR to allow multiple instances of this */
/* application to receive copies of the multicast datagrams. */
{
int reuse = 1;
if(setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) < 0)
{
perror("Setting SO_REUSEADDR error");
close(sd);
exit(1);
}
else
printf("Setting SO_REUSEADDR...OK.\n");
}

/* Bind to the proper port number with the IP address */
/* specified as INADDR_ANY. */
memset((char *) &localSock, 0, sizeof(localSock));
localSock.sin_family = AF_INET;
localSock.sin_port = htons(5000);
localSock.sin_addr.s_addr = INADDR_ANY;
if(bind(sd, (struct sockaddr*)&localSock, sizeof(localSock)))
{
perror("Binding datagram socket error");
close(sd);
exit(1);
}
else
printf("Binding datagram socket...OK.\n");

time(&tloc);
old=localtime(&tloc);
printf("%d:%d:%d- start time!\n", old->tm_hour, old->tm_min, old->tm_sec);

/* Join the multicast group 226.1.1.1 on the local 203.106.93.94 */
/* interface. Note that this IP_ADD_MEMBERSHIP option must be */
/* called for each local interface over which the multicast */
/* datagrams are to be received. */
group.imr_multiaddr.s_addr = inet_addr("232.32.0.34");
//group.imr_interface.s_addr = inet_addr("192.168.1.250");
group.imr_interface.s_addr = inet_addr("10.194.180.203");
if(setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&group, sizeof(group)) < 0)
{
perror("Adding multicast group error");
close(sd);
exit(1);
}
else
printf("Adding multicast group...OK.\n");

/* Read from the socket. */
datalen = sizeof(databuf);
while(read(sd, databuf, datalen) > 0)
/*{
perror("Reading datagram message error");
close(sd);
exit(1);
}
else*/
{
//printf("Reading datagram message...OK.\n");
//printf("The message from multicast server is: \"%s\"\n", databuf);
printf(".");
fflush(stdout);
}
time(&tloc);
old=localtime(&tloc);
printf("%d:%d:%d- end time!\n", old->tm_hour, old->tm_min, old->tm_sec);

return 0;
}