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\n", cmd);
22 main(int argc, char *argv[])
24 struct sockaddr_in in, local_in;
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;
34 while ((opt = getopt(argc, argv, "4:P:b:p:")) != -1) {
37 if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
42 local_in.sin_port = strtol(optarg, NULL, 10);
43 local_in.sin_port = htons(local_in.sin_port);
47 if (inet_pton(AF_INET, optarg, &local_in.sin_addr) <= 0)
52 in.sin_port = strtol(optarg, NULL, 10);
53 in.sin_port = htons(in.sin_port);
61 if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0 ||
62 local_in.sin_port == 0)
65 s = socket(AF_INET, SOCK_DGRAM, 0);
67 err(2, "socket failed");
69 if (bind(s, (const struct sockaddr *)&local_in, sizeof(local_in)) < 0)
70 err(2, "bind failed");
72 n = sendto(s, buf, sizeof(buf), 0,
73 (const struct sockaddr *)&in, sizeof(in));
75 err(2, "sendto failed");
76 else if (n != (int)sizeof(buf))
77 errx(2, "sent truncated data %d", n);
79 n = read(s, buf, sizeof(buf));
81 err(2, "read failed");
82 printf("read %d, done\n", n);