1 #include <sys/socket.h>
2 #include <netinet/in.h>
3 #include <strings.h>
4 #include <string.h>
5 #include <err.h>
6
7 int
main(int argc,char ** argv)8 main(int argc, char **argv)
9 {
10 struct sockaddr_in addr1, addr2;
11 int fd1, fd2, enable = 1;
12
13 addr1.sin_family = AF_INET;
14 addr1.sin_port = htons(6666);
15 addr1.sin_addr.s_addr = INADDR_ANY;
16 /* fill sin_zero explicitly with garbage */
17 memset(addr1.sin_zero, 0xd0, sizeof(addr1.sin_zero));
18
19 addr2.sin_family = AF_INET;
20 addr2.sin_port = htons(6666);
21 addr2.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
22 /* fill sin_zero explicitly with garbage */
23 memset(addr2.sin_zero, 0xd0, sizeof(addr2.sin_zero));
24
25
26 if ((fd1 = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
27 err(1, "socket1");
28
29 if (setsockopt(fd1, SOL_SOCKET, SO_REUSEPORT, &enable,
30 sizeof(int)) < 0)
31 err(1, "setsockopt1");
32
33 if (bind(fd1, (struct sockaddr *)&addr1, sizeof(addr1)) == -1)
34 err(1, "bind1");
35
36 if ((fd2 = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
37 err(1, "socket1");
38
39 if (setsockopt(fd2, SOL_SOCKET, SO_REUSEPORT, &enable,
40 sizeof(int)) < 0)
41 err(1, "setsockopt2");
42
43 if (bind(fd2, (struct sockaddr *)&addr2, sizeof(addr2)) == -1)
44 err(1, "bind2");
45
46 return 0;
47 }
48