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