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      1 /*	$NetBSD: getport.c,v 1.2 2008/04/28 20:24:14 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: getport.c,v 1.2 2008/04/28 20:24:14 martin Exp $");
     34 
     35 #include <stdlib.h>
     36 #include <err.h>
     37 #include <netdb.h>
     38 #include <limits.h>
     39 #include <errno.h>
     40 #include <netinet/in.h>
     41 
     42 #include "getport.h"
     43 
     44 struct servent *
     45 getport(const char *service, const char *protocol)
     46 {
     47 	long port;
     48 	char *ep;
     49 	struct servent *sp = getservbyname(service, protocol);
     50 	if (sp != NULL)
     51 		return sp;
     52 
     53 	if ((sp = calloc(1, sizeof(*sp))) == NULL)
     54 		err(1, "malloc");
     55 	sp->s_name = __UNCONST(service);
     56 	sp->s_proto = __UNCONST(protocol);
     57 	port = strtol(service, &ep, 0);
     58 	if ((service[0] != '\0' && *ep != '\0') ||
     59 	    (errno == ERANGE &&
     60 	    (port == LONG_MAX || port == LONG_MIN)) ||
     61 	    (port <= 0 || port >= IPPORT_ANONMAX))
     62 		errx(1,"port must be between 1 and %d",
     63 		    IPPORT_ANONMAX);
     64 	sp->s_port = htons((uint16_t)port);
     65 	return sp;
     66 }
     67