2 #include <sys/socket.h>
6 #include <netinet/in.h>
16 usage(const char *cmd)
18 fprintf(stderr, "%s -m addr -p port (-i addr | -I iface) [-a]\n", cmd);
23 create_sock(const struct sockaddr_in *in0, const struct in_addr *iface,
24 int iface_idx, int bind_any)
26 struct sockaddr_in in;
29 s = socket(AF_INET, SOCK_DGRAM, 0);
31 err(2, "socket failed");
34 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)) < 0)
35 err(2, "setsockopt SO_REUSEPORT failed");
39 in.sin_addr.s_addr = htonl(INADDR_ANY);
41 if (bind(s, (const struct sockaddr *)&in, sizeof(in)) < 0)
42 err(2, "bind failed");
47 fprintf(stderr, "ip_mreq add_member\n");
48 memset(&mreq, 0, sizeof(mreq));
49 mreq.imr_multiaddr = in0->sin_addr;
50 mreq.imr_interface = *iface;
51 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,
52 &mreq, sizeof(mreq)) < 0)
53 err(2, "setsockopt IP_ADD_MEMBERSHIP ip_mreq failed");
55 struct ip_mreqn mreqn;
57 fprintf(stderr, "ip_mreqn add_member, ifindex %d\n", iface_idx);
58 memset(&mreqn, 0, sizeof(mreqn));
59 mreqn.imr_multiaddr = in0->sin_addr;
60 mreqn.imr_address = *iface;
61 mreqn.imr_ifindex = iface_idx;
62 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,
63 &mreqn, sizeof(mreqn)) < 0)
64 err(2, "setsockopt IP_ADD_MEMBERSHIP ip_mreqn failed");
71 main(int argc, char *argv[])
73 struct sockaddr_in in;
75 int s1, s2, opt, n, bind_any, iface_idx;
78 memset(&in, 0, sizeof(in));
79 in.sin_family = AF_INET;
81 memset(&iface, 0, sizeof(iface));
85 while ((opt = getopt(argc, argv, "I:ai:m:p:")) != -1) {
88 iface_idx = if_nametoindex(optarg);
96 if (inet_pton(AF_INET, optarg, &iface) <= 0)
101 if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
106 in.sin_port = strtol(optarg, NULL, 10);
107 in.sin_port = htons(in.sin_port);
115 if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0 ||
116 (iface.s_addr == INADDR_ANY && iface_idx < 0))
119 s1 = create_sock(&in, &iface, iface_idx, bind_any);
120 s2 = create_sock(&in, &iface, iface_idx, bind_any);
122 n = read(s1, buf, sizeof(buf));
124 err(2, "read 1 failed");
125 fprintf(stderr, "read 1 got %d\n", n);
127 n = read(s2, buf, sizeof(buf));
129 err(2, "read 2 failed");
130 fprintf(stderr, "read 2 got %d\n", n);