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