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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* tests/misc/test_getsockname.c */
/*
* Copyright (C) 1995 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* test_getsockname.c
*
* This routine demonstrates a bug in the socket emulation library of
* Solaris and other monstrosities that uses STREAMS. On other
* machines with a real networking layer, it prints the local
* interface address that is used to send a message to a specific
* host. On Solaris, it prints out 0.0.0.0.
*/
#include "autoconf.h"
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
int
main(argc, argv)
int argc;
char *argv[];
{
int sock;
GETSOCKNAME_ARG3_TYPE i;
struct hostent *host;
struct sockaddr_in s_sock; /* server address */
struct sockaddr_in c_sock; /* client address */
char *hostname;
if (argc == 2) {
hostname = argv[1];
} else {
fprintf(stderr, "Usage: %s hostname\n", argv[0]);
exit(1);
}
/* Look up server host */
if ((host = gethostbyname(hostname)) == (struct hostent *) 0) {
fprintf(stderr, "%s: unknown host\n", hostname);
exit(1);
}
/* Set server's address */
(void) memset(&s_sock, 0, sizeof(s_sock));
memcpy(&s_sock.sin_addr, host->h_addr, sizeof(s_sock.sin_addr));
#ifdef DEBUG
printf("s_sock.sin_addr is %s\n", inet_ntoa(s_sock.sin_addr));
#endif
s_sock.sin_family = AF_INET;
s_sock.sin_port = htons(5555);
/* Open a socket */
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
exit(1);
}
memset(&c_sock, 0, sizeof(c_sock));
c_sock.sin_family = AF_INET;
/* Bind it to set the address; kernel will fill in port # */
if (bind(sock, (struct sockaddr *)&c_sock, sizeof(c_sock)) < 0) {
perror("bind");
exit(1);
}
/* "connect" the datagram socket; this is necessary to get a local address
properly bound for getsockname() below. */
if (connect(sock, (struct sockaddr *)&s_sock, sizeof(s_sock)) == -1) {
perror("connect");
exit(1);
}
/* Get my address */
memset(&c_sock, 0, sizeof(c_sock));
i = sizeof(c_sock);
if (getsockname(sock, (struct sockaddr *)&c_sock, &i) < 0) {
perror("getsockname");
exit(1);
}
printf("My interface address is: %s\n", inet_ntoa(c_sock.sin_addr));
exit(0);
}
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