minix/usr.bin/rsh/getport.c

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