2 #include <sys/socket.h>
5 #include <netinet/in.h>
15 usage(const char *cmd)
17 fprintf(stderr, "%s -4 ip4 -p port [-b ip4] -P bind_port [-r]\n", cmd);
22 main(int argc, char *argv[])
24 struct sockaddr_in in, local_in;
25 int s, opt, n, reuseport;
28 memset(&in, 0, sizeof(in));
29 in.sin_family = AF_INET;
31 memset(&local_in, 0, sizeof(local_in));
32 local_in.sin_family = AF_INET;
36 while ((opt = getopt(argc, argv, "4:P:b:p:r")) != -1) {
39 if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
44 local_in.sin_port = strtol(optarg, NULL, 10);
45 local_in.sin_port = htons(local_in.sin_port);
49 if (inet_pton(AF_INET, optarg, &local_in.sin_addr) <= 0)
54 in.sin_port = strtol(optarg, NULL, 10);
55 in.sin_port = htons(in.sin_port);
67 if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0 ||
68 local_in.sin_port == 0)
71 s = socket(AF_INET, SOCK_DGRAM, 0);
73 err(2, "socket failed");
76 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT,
77 &reuseport, sizeof(reuseport)) < 0)
78 err(2, "setsockopt SO_REUSEPORT failed");
81 if (bind(s, (const struct sockaddr *)&local_in, sizeof(local_in)) < 0)
82 err(2, "bind failed");
84 n = sendto(s, buf, sizeof(buf), 0,
85 (const struct sockaddr *)&in, sizeof(in));
87 err(2, "sendto failed");
88 else if (n != (int)sizeof(buf))
89 errx(2, "sent truncated data %d", n);
91 n = read(s, buf, sizeof(buf));
93 err(2, "read failed");
94 printf("read %d, done\n", n);