1 files changed, 26 insertions, 0 deletions
diff --git a/src/bin/mcast.c b/src/bin/mcast.c
new file mode 100644
index 0000000..e48c504
--- /dev/null
+++ b/src/bin/mcast.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+int main(int argc,char *argv[]) {
+ int s=socket(AF_INET,SOCK_DGRAM,0);
+ char packet[1501];//mtu of an interface. including headers though. meh.
+ int n;
+ struct ip_mreq mreq;
+ struct sockaddr_in sa;
+ int one = sizeof(struct sockaddr_in);
+ setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+ memset(&sa,0,sizeof(struct sockaddr_in));
+ sa.sin_addr.s_addr=htonl(INADDR_ANY);
+ sa.sin_port=htons(atoi(argv[2]));
+ sa.sin_family=AF_INET;
+ bind(s,(struct sockaddr *)&sa,sizeof(struct sockaddr_in)); 
+ mreq.imr_multiaddr.s_addr=inet_addr(argv[1]);
+ mreq.imr_interface.s_addr=htonl(INADDR_ANY);
+ setsockopt(s,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq));
+ while((n=recvfrom(s,packet,sizeof(packet),0,(struct sockaddr *)&sa,&one)) > 0) {
+  printf("%s ",inet_ntoa(sa.sin_addr));
+  fflush(stdout);
+  write(1,packet,n);
+ }
+}