2007-09-19 Joel Sherrill <joel.sherrill@oarcorp.com>

	* ChangeLog, Makefile, README, init.c, listener.c, mcast.c,
	mcast_params.h, mcast_route.c, rootfs/etc/host.conf,
	rootfs/etc/hosts: New files.

1 files changed, 84 insertions, 0 deletions

diff --git a/mcast/listener.c b/mcast/listener.c
new file mode 100644
index 0000000..5daa6c4
--- /dev/null
+++ b/mcast/listener.c
@@ -0,0 +1,84 @@
+/*
+ * listener.c -- joins a multicast group and echoes all data it receives from
+ *		the group to its stdout...
+ *
+ * Antony Courtney,	25/11/94
+ * Modified by: Frédéric Bastien (25/03/04)
+ * to compile without warning and work correctly
+ *
+ * http://ntrg.cs.tcd.ie/undergrad/4ba2/multicast/antony/example.html
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <time.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mcast_params.h"
+
+#define HELLO_PORT  MCAST_PORT
+#define HELLO_GROUP MCAST_ADDR
+
+#define MSGBUFSIZE 256
+
+main(int argc, char *argv[])
+{
+     struct sockaddr_in addr;
+     int fd, nbytes,addrlen;
+     struct ip_mreq mreq;
+     char msgbuf[MSGBUFSIZE];
+
+     u_int yes=1;            /*** MODIFICATION TO ORIGINAL */
+
+     /* create what looks like an ordinary UDP socket */
+     if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
+	  perror("socket");
+	  exit(1);
+     }
+
+
+/**** MODIFICATION TO ORIGINAL */
+    /* allow multiple sockets to use the same PORT number */
+    if (setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(yes)) < 0) {
+       perror("Reusing ADDR failed");
+       exit(1);
+       }
+/*** END OF MODIFICATION TO ORIGINAL */
+
+     /* set up destination address */
+     memset(&addr,0,sizeof(addr));
+     addr.sin_family=AF_INET;
+     addr.sin_addr.s_addr=htonl(INADDR_ANY); /* N.B.: differs from sender */
+     addr.sin_port=htons(HELLO_PORT);
+     
+     /* bind to receive address */
+     if (bind(fd,(struct sockaddr *) &addr,sizeof(addr)) < 0) {
+	  perror("bind");
+	  exit(1);
+     }
+     
+     /* use setsockopt() to request that the kernel join a multicast group */
+     mreq.imr_multiaddr.s_addr=inet_addr(HELLO_GROUP);
+     mreq.imr_interface.s_addr=htonl(INADDR_ANY);
+     if (setsockopt(fd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) < 0) {
+	  perror("setsockopt");
+	  exit(1);
+     }
+
+     /* now just enter a read-print loop */
+     while (1) {
+	  addrlen=sizeof(addr);
+	  if ((nbytes=recvfrom(fd,msgbuf,MSGBUFSIZE,0,
+			       (struct sockaddr *) &addr,&addrlen)) < 0) {
+	       perror("recvfrom");
+	       exit(1);
+	  }
+	  puts(msgbuf);
+     }
+}
+
+