119 lines
2.6 KiB
Bash
Executable File
119 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
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# Multicast test example by Mark Claypool, claypool at cs.wpi.edu
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# https://web.cs.wpi.edu/~claypool/courses/4514-B99/samples/multicast.c
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# Kernel page fault seen with WiP branch:
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# https://people.freebsd.org/~pho/stress/log/kip036.txt
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. ../default.cfg
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dir=/tmp
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odir=`pwd`
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cd $dir
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sed '1,/^EOF/d' < $odir/$0 > $dir/multicast.c
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mycc -o multicast -Wall -Wextra -O0 -g multicast.c || exit 1
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rm -f multicast.c
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cd $odir
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cd $dir
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(
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timeout -k 1s 20s ./multicast &
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sleep 1
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timeout -k 1s 25s ./multicast 1
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) > /dev/null
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wait
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rm -f $dir/multicast
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exit $s
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EOF
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/*
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multicast.c
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The following program sends or receives multicast packets. If invoked
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with one argument, it sends a packet containing the current time to an
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arbitrarily chosen multicast group and UDP port. If invoked with no
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arguments, it receives and prints these packets. Start it as a sender on
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just one host and as a receiver on all the other hosts
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define EXAMPLE_PORT 6000
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#define EXAMPLE_GROUP "239.0.0.1"
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int
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main(int argc, char *argv[] __unused)
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{
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struct ip_mreq mreq;
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struct sockaddr_in addr;
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socklen_t addrlen;
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int cnt, sock;
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char message[50];
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/* set up socket */
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0) {
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perror("socket");
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exit(1);
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}
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bzero((char *)&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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addr.sin_port = htons(EXAMPLE_PORT);
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addrlen = sizeof(addr);
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if (argc > 1) {
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/* send */
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addr.sin_addr.s_addr = inet_addr(EXAMPLE_GROUP);
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while (1) {
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time_t t = time(0);
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sprintf(message, "time is %-24.24s", ctime(&t));
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printf("sending: %s\n", message);
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cnt = sendto(sock, message, sizeof(message), 0,
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(struct sockaddr *) &addr, addrlen);
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if (cnt < 0) {
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perror("sendto");
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exit(1);
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}
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sleep(5);
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}
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} else {
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/* receive */
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if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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perror("bind");
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exit(1);
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}
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mreq.imr_multiaddr.s_addr = inet_addr(EXAMPLE_GROUP);
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mreq.imr_interface.s_addr = htonl(INADDR_ANY);
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if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
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&mreq, sizeof(mreq)) < 0) {
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perror("setsockopt mreq");
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exit(1);
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}
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while (1) {
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cnt = recvfrom(sock, message, sizeof(message), 0,
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(struct sockaddr *) &addr, &addrlen);
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if (cnt < 0) {
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perror("recvfrom");
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exit(1);
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} else if (cnt == 0) {
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break;
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}
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printf("%s: message = \"%s\"\n", inet_ntoa(addr.sin_addr), message);
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}
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}
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}
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