/* opensock.c - open a unix domain socket */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2007-2018 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>.
 */
/* ACKNOWLEDGEMENTS:
 * This work was initially developed by Brian Candler for inclusion
 * in OpenLDAP Software.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/errno.h>
#include <ac/string.h>
#include <ac/socket.h>
#include <ac/unistd.h>

#include "slap.h"
#include "back-sock.h"

/*
 * FIXME: count the number of concurrent open sockets (since each thread
 * may open one). Perhaps block here if a soft limit is reached, and fail
 * if a hard limit reached
 */

FILE *
opensock(
    const char	*sockpath
)
{
	int	fd;
	FILE	*fp;
	struct sockaddr_un sockun;

	fd = socket(PF_UNIX, SOCK_STREAM, 0);
	if ( fd < 0 ) {
		Debug( LDAP_DEBUG_ANY, "socket create failed\n", 0, 0, 0 );
		return( NULL );
	}

	sockun.sun_family = AF_UNIX;
	sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
		sockpath);
	if ( connect( fd, (struct sockaddr *)&sockun, sizeof(sockun) ) < 0 ) {
		Debug( LDAP_DEBUG_ANY, "socket connect(%s) failed\n",
			sockpath ? sockpath : "<null>", 0, 0 );
		close( fd );
		return( NULL );
	}

	if ( ( fp = fdopen( fd, "r+" ) ) == NULL ) {
		Debug( LDAP_DEBUG_ANY, "fdopen failed\n", 0, 0, 0 );
		close( fd );
		return( NULL );
	}

	return( fp );
}