1*28da9003SSepherosa Ziehau #include <sys/types.h>
2*28da9003SSepherosa Ziehau #include <sys/socket.h>
3*28da9003SSepherosa Ziehau
4*28da9003SSepherosa Ziehau #include <arpa/inet.h>
5*28da9003SSepherosa Ziehau #include <netinet/in.h>
6*28da9003SSepherosa Ziehau
7*28da9003SSepherosa Ziehau #include <err.h>
8*28da9003SSepherosa Ziehau #include <stdio.h>
9*28da9003SSepherosa Ziehau #include <stdint.h>
10*28da9003SSepherosa Ziehau #include <stdlib.h>
11*28da9003SSepherosa Ziehau #include <string.h>
12*28da9003SSepherosa Ziehau #include <unistd.h>
13*28da9003SSepherosa Ziehau
14*28da9003SSepherosa Ziehau static void
usage(const char * cmd)15*28da9003SSepherosa Ziehau usage(const char *cmd)
16*28da9003SSepherosa Ziehau {
17*28da9003SSepherosa Ziehau fprintf(stderr, "%s -4 ip4 -p port\n", cmd);
18*28da9003SSepherosa Ziehau exit(1);
19*28da9003SSepherosa Ziehau }
20*28da9003SSepherosa Ziehau
21*28da9003SSepherosa Ziehau int
main(int argc,char * argv[])22*28da9003SSepherosa Ziehau main(int argc, char *argv[])
23*28da9003SSepherosa Ziehau {
24*28da9003SSepherosa Ziehau struct sockaddr_in in, in2;
25*28da9003SSepherosa Ziehau int s, opt, n;
26*28da9003SSepherosa Ziehau uint8_t buf[18];
27*28da9003SSepherosa Ziehau
28*28da9003SSepherosa Ziehau memset(&in, 0, sizeof(in));
29*28da9003SSepherosa Ziehau in.sin_family = AF_INET;
30*28da9003SSepherosa Ziehau
31*28da9003SSepherosa Ziehau while ((opt = getopt(argc, argv, "4:p:")) != -1) {
32*28da9003SSepherosa Ziehau switch (opt) {
33*28da9003SSepherosa Ziehau case '4':
34*28da9003SSepherosa Ziehau if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
35*28da9003SSepherosa Ziehau usage(argv[0]);
36*28da9003SSepherosa Ziehau break;
37*28da9003SSepherosa Ziehau
38*28da9003SSepherosa Ziehau case 'p':
39*28da9003SSepherosa Ziehau in.sin_port = strtol(optarg, NULL, 10);
40*28da9003SSepherosa Ziehau in.sin_port = htons(in.sin_port);
41*28da9003SSepherosa Ziehau break;
42*28da9003SSepherosa Ziehau
43*28da9003SSepherosa Ziehau default:
44*28da9003SSepherosa Ziehau usage(argv[0]);
45*28da9003SSepherosa Ziehau }
46*28da9003SSepherosa Ziehau }
47*28da9003SSepherosa Ziehau
48*28da9003SSepherosa Ziehau if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0)
49*28da9003SSepherosa Ziehau usage(argv[0]);
50*28da9003SSepherosa Ziehau
51*28da9003SSepherosa Ziehau s = socket(AF_INET, SOCK_DGRAM, 0);
52*28da9003SSepherosa Ziehau if (s < 0)
53*28da9003SSepherosa Ziehau err(2, "socket failed");
54*28da9003SSepherosa Ziehau
55*28da9003SSepherosa Ziehau if (connect(s, (const struct sockaddr *)&in, sizeof(in)) < 0)
56*28da9003SSepherosa Ziehau err(2, "connect failed");
57*28da9003SSepherosa Ziehau
58*28da9003SSepherosa Ziehau memset(&in2, 0, sizeof(in2));
59*28da9003SSepherosa Ziehau in2.sin_family = AF_UNSPEC;
60*28da9003SSepherosa Ziehau connect(s, (const struct sockaddr *)&in2, sizeof(in2));
61*28da9003SSepherosa Ziehau
62*28da9003SSepherosa Ziehau n = sendto(s, buf, sizeof(buf), 0,
63*28da9003SSepherosa Ziehau (const struct sockaddr *)&in, sizeof(in));
64*28da9003SSepherosa Ziehau if (n < 0)
65*28da9003SSepherosa Ziehau err(2, "sendto failed");
66*28da9003SSepherosa Ziehau else if (n != (int)sizeof(buf))
67*28da9003SSepherosa Ziehau errx(2, "sendto truncated data %d", n);
68*28da9003SSepherosa Ziehau
69*28da9003SSepherosa Ziehau n = read(s, buf, sizeof(buf));
70*28da9003SSepherosa Ziehau if (n < 0)
71*28da9003SSepherosa Ziehau err(2, "read failed");
72*28da9003SSepherosa Ziehau printf("read %d, done\n", n);
73*28da9003SSepherosa Ziehau
74*28da9003SSepherosa Ziehau exit(0);
75*28da9003SSepherosa Ziehau }
76