1/*	$NetBSD$	*/
2
3/* OpenLDAP: pkg/ldap/libraries/liblutil/sockpair.c,v 1.17.2.5 2010/04/13 20:23:07 kurt Exp */
4/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 *
6 * Copyright 1998-2010 The OpenLDAP Foundation.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted only as authorized by the OpenLDAP
11 * Public License.
12 *
13 * A copy of this license is available in the file LICENSE in the
14 * top-level directory of the distribution or, alternatively, at
15 * <http://www.OpenLDAP.org/license.html>.
16 */
17
18#include "portable.h"
19#include <ac/socket.h>
20#include <ac/unistd.h>
21
22#include <lutil.h>
23
24/* Return a pair of socket descriptors that are connected to each other.
25 * The returned descriptors are suitable for use with select(). The two
26 * descriptors may or may not be identical; the function may return
27 * the same descriptor number in both slots. It is guaranteed that
28 * data written on sds[1] will be readable on sds[0]. The returned
29 * descriptors may be datagram oriented, so data should be written
30 * in reasonably small pieces and read all at once. On Unix systems
31 * this function is best implemented using a single pipe() call.
32 */
33
34int lutil_pair( ber_socket_t sds[2] )
35{
36#ifdef USE_PIPE
37	return pipe( sds );
38#else
39	struct sockaddr_in si;
40	int rc;
41	ber_socklen_t len = sizeof(si);
42	ber_socket_t sd;
43
44	sd = socket( AF_INET, SOCK_DGRAM, 0 );
45	if ( sd == AC_SOCKET_INVALID ) {
46		return sd;
47	}
48
49	(void) memset( (void*) &si, '\0', len );
50	si.sin_family = AF_INET;
51	si.sin_port = 0;
52	si.sin_addr.s_addr = htonl( INADDR_LOOPBACK );
53
54	rc = bind( sd, (struct sockaddr *)&si, len );
55	if ( rc == AC_SOCKET_ERROR ) {
56		tcp_close(sd);
57		return rc;
58	}
59
60	rc = getsockname( sd, (struct sockaddr *)&si, &len );
61	if ( rc == AC_SOCKET_ERROR ) {
62		tcp_close(sd);
63		return rc;
64	}
65
66	rc = connect( sd, (struct sockaddr *)&si, len );
67	if ( rc == AC_SOCKET_ERROR ) {
68		tcp_close(sd);
69		return rc;
70	}
71
72	sds[0] = sd;
73#if !HAVE_WINSOCK
74	sds[1] = dup( sds[0] );
75#else
76	sds[1] = sds[0];
77#endif
78	return 0;
79#endif
80}
81