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getport.c revision 1.1 
      1 /*	$NetBSD: getport.c,v 1.1 2004/10/16 02:03:54 christos 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __RCSID("$NetBSD: getport.c,v 1.1 2004/10/16 02:03:54 christos Exp $");
     41 
     42 #include <stdlib.h>
     43 #include <err.h>
     44 #include <netdb.h>
     45 #include <limits.h>
     46 #include <errno.h>
     47 #include <netinet/in.h>
     48 
     49 #include "getport.h"
     50 
     51 struct servent *
     52 getport(const char *service, const char *protocol)
     53 {
     54 	long port;
     55 	char *ep;
     56 	struct servent *sp = getservbyname(service, protocol);
     57 	if (sp != NULL)
     58 		return sp;
     59 
     60 	if ((sp = calloc(1, sizeof(*sp))) == NULL)
     61 		err(1, "malloc");
     62 	sp->s_name = __UNCONST(service);
     63 	sp->s_proto = __UNCONST(protocol);
     64 	port = strtol(service, &ep, 0);
     65 	if ((service[0] != '\0' && *ep != '\0') ||
     66 	    (errno == ERANGE &&
     67 	    (port == LONG_MAX || port == LONG_MIN)) ||
     68 	    (port <= 0 || port >= IPPORT_ANONMAX))
     69 		errx(1,"port must be between 1 and %d",
     70 		    IPPORT_ANONMAX);
     71 	sp->s_port = htons((uint16_t)port);
     72 	return sp;
     73 }
     74