David Stevens wrote:
> Can you send the contents of /proc/net/igmp and the packet trace,
> also? And the code?
>
> +-DLS
>
# cat /proc/net/igmp
Idx Device : Count Querier Group Users Timer Reporter
1 lo : 0 V3
010000E0 1 0:00000000 0
2 eth0 : 3 V2
010000E0 1 0:00000000 0
3 eth1 : 4 V2
030100E0 1 0:00000000 1
010000E0 1 0:00000000 0
Source attached. The trace only shows a single udp packet and you can
re-create it with the attached small apps.
-vlad
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
int main(int argc, char **argv)
{
struct sockaddr_storage dest;
struct sockaddr_storage src;
struct sockaddr_in *s = (struct sockaddr_in*) &src;
struct sockaddr_in *d = (struct sockaddr_in *)&dest;
int sock;
char msg[] = "Hello Multicast";
int off = 0;
memset(&dest, 0, sizeof(dest));
memset(&src, 0, sizeof(src));
if (argc < 3) {
printf("Usage: <src ip> <mcast dest>\n");
return 1;
}
d->sin_family = s->sin_family = AF_INET;
d->sin_port = htons(2000);
inet_aton(argv[1], &s->sin_addr);
inet_aton(argv[2], &d->sin_addr);
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP, &off,
sizeof(off))) {
perror("setsockopt");
return 1;
}
if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, s, sizeof(*s))) {
perror("setsockopt");
return 1;
}
sendto(sock, msg, sizeof(msg), 0, (struct sockaddr *)d, sizeof(*d));
close (socket);
return 0;
}
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
int main(int argc, char **argv)
{
struct sockaddr_in addr;
int addr_len;
struct ip_mreq req;
int sock;
char msg[256];
memset(&addr, 0, sizeof(addr));
if (argc < 3) {
printf("Usage: <interface ip> <mcast group>\n");
return 1;
}
sock = socket(AF_INET, SOCK_DGRAM, 0);
addr.sin_family = AF_INET;
addr.sin_port = htons(2000);
if (bind(sock, (struct sockaddr *)&addr, sizeof(addr))) {
perror("bind");
return 1;
}
inet_aton(argv[1], &req.imr_interface);
inet_aton(argv[2], &req.imr_multiaddr);
if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &req,
sizeof(req))) {
perror("setsockopt");
return 1;
}
recvfrom(sock, msg, sizeof(msg), 0, (struct sockaddr *)&addr, &addr_len);
printf("Message recieved: %s", msg);
close (socket);
return 0;
}
