67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
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/* $NetBSD: getport.c,v 1.2 2008/04/28 20:24:14 martin Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: getport.c,v 1.2 2008/04/28 20:24:14 martin Exp $");
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#include <stdlib.h>
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#include <err.h>
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#include <netdb.h>
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#include <limits.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include "getport.h"
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struct servent *
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getport(const char *service, const char *protocol)
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{
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long port;
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char *ep;
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struct servent *sp = getservbyname(service, protocol);
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if (sp != NULL)
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return sp;
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if ((sp = calloc(1, sizeof(*sp))) == NULL)
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err(1, "malloc");
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sp->s_name = __UNCONST(service);
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sp->s_proto = __UNCONST(protocol);
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port = strtol(service, &ep, 0);
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if ((service[0] != '\0' && *ep != '\0') ||
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(errno == ERANGE &&
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(port == LONG_MAX || port == LONG_MIN)) ||
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(port <= 0 || port >= IPPORT_ANONMAX))
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errx(1,"port must be between 1 and %d",
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IPPORT_ANONMAX);
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sp->s_port = htons((uint16_t)port);
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return sp;
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}
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