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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2022 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include "portable.h"
#include <ac/socket.h>
#include <ac/unistd.h>
#include <lutil.h>
/* Return a pair of socket descriptors that are connected to each other.
* The returned descriptors are suitable for use with select(). The two
* descriptors may or may not be identical; the function may return
* the same descriptor number in both slots. It is guaranteed that
* data written on sds[1] will be readable on sds[0]. The returned
* descriptors may be datagram oriented, so data should be written
* in reasonably small pieces and read all at once. On Unix systems
* this function is best implemented using a single pipe() call.
*/
int lutil_pair( ber_socket_t sds[2] )
{
#ifdef USE_PIPE
return pipe( sds );
#else
struct sockaddr_in si;
int rc;
ber_socklen_t len = sizeof(si);
ber_socket_t sd;
sd = socket( AF_INET, SOCK_DGRAM, 0 );
if ( sd == AC_SOCKET_INVALID ) {
return sd;
}
(void) memset( (void*) &si, '\0', len );
si.sin_family = AF_INET;
si.sin_port = 0;
si.sin_addr.s_addr = htonl( INADDR_LOOPBACK );
rc = bind( sd, (struct sockaddr *)&si, len );
if ( rc == AC_SOCKET_ERROR ) {
tcp_close(sd);
return rc;
}
rc = getsockname( sd, (struct sockaddr *)&si, &len );
if ( rc == AC_SOCKET_ERROR ) {
tcp_close(sd);
return rc;
}
rc = connect( sd, (struct sockaddr *)&si, len );
if ( rc == AC_SOCKET_ERROR ) {
tcp_close(sd);
return rc;
}
sds[0] = sd;
#if !HAVE_WINSOCK
sds[1] = dup( sds[0] );
#else
sds[1] = sds[0];
#endif
return 0;
#endif
}
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