1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* tests/misc/test_getsockname.c */
3 /*
4 * Copyright (C) 1995 by the Massachusetts Institute of Technology.
5 * All rights reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 */
26
27 /*
28 * test_getsockname.c
29 *
30 * This routine demonstrates a bug in the socket emulation library of
31 * Solaris and other monstrosities that uses STREAMS. On other
32 * machines with a real networking layer, it prints the local
33 * interface address that is used to send a message to a specific
34 * host. On Solaris, it prints out 0.0.0.0.
35 */
36
37 #include "autoconf.h"
38 #include <unistd.h>
39 #include <stdlib.h>
40 #include <errno.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <netdb.h>
45 #include <stdio.h>
46 #include <string.h>
47
48 int
main(argc,argv)49 main(argc, argv)
50 int argc;
51 char *argv[];
52 {
53 int sock;
54 GETSOCKNAME_ARG3_TYPE i;
55 struct hostent *host;
56 struct sockaddr_in s_sock; /* server address */
57 struct sockaddr_in c_sock; /* client address */
58
59 char *hostname;
60
61 if (argc == 2) {
62 hostname = argv[1];
63 } else {
64 fprintf(stderr, "Usage: %s hostname\n", argv[0]);
65 exit(1);
66 }
67
68 /* Look up server host */
69 if ((host = gethostbyname(hostname)) == (struct hostent *) 0) {
70 fprintf(stderr, "%s: unknown host\n", hostname);
71 exit(1);
72 }
73
74 /* Set server's address */
75 (void) memset(&s_sock, 0, sizeof(s_sock));
76
77 memcpy(&s_sock.sin_addr, host->h_addr, sizeof(s_sock.sin_addr));
78 #ifdef DEBUG
79 printf("s_sock.sin_addr is %s\n", inet_ntoa(s_sock.sin_addr));
80 #endif
81 s_sock.sin_family = AF_INET;
82 s_sock.sin_port = htons(5555);
83
84 /* Open a socket */
85 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
86 perror("socket");
87 exit(1);
88 }
89
90 memset(&c_sock, 0, sizeof(c_sock));
91 c_sock.sin_family = AF_INET;
92
93 /* Bind it to set the address; kernel will fill in port # */
94 if (bind(sock, (struct sockaddr *)&c_sock, sizeof(c_sock)) < 0) {
95 perror("bind");
96 exit(1);
97 }
98
99 /* "connect" the datagram socket; this is necessary to get a local address
100 properly bound for getsockname() below. */
101 if (connect(sock, (struct sockaddr *)&s_sock, sizeof(s_sock)) == -1) {
102 perror("connect");
103 exit(1);
104 }
105
106 /* Get my address */
107 memset(&c_sock, 0, sizeof(c_sock));
108 i = sizeof(c_sock);
109 if (getsockname(sock, (struct sockaddr *)&c_sock, &i) < 0) {
110 perror("getsockname");
111 exit(1);
112 }
113
114 printf("My interface address is: %s\n", inet_ntoa(c_sock.sin_addr));
115
116 exit(0);
117 }
118