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/* $OpenBSD: rresvport.c,v 1.11 2015/09/12 14:56:50 guenther Exp $ */
/*
* Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved.
* Copyright (c) 1983, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <syslog.h>
#include <stdlib.h>
#include <netgroup.h>
int
rresvport(int *alport)
{
return rresvport_af(alport, AF_INET);
}
int
rresvport_af(int *alport, int af)
{
struct sockaddr_storage ss;
struct sockaddr *sa;
u_int16_t *portp;
int s;
bzero(&ss, sizeof ss);
sa = (struct sockaddr *)&ss;
switch (af) {
case AF_INET:
sa->sa_len = sizeof(struct sockaddr_in);
portp = &((struct sockaddr_in *)sa)->sin_port;
break;
case AF_INET6:
sa->sa_len = sizeof(struct sockaddr_in6);
portp = &((struct sockaddr_in6 *)sa)->sin6_port;
break;
default:
errno = EPFNOSUPPORT;
return (-1);
}
sa->sa_family = af;
s = socket(af, SOCK_STREAM, 0);
if (s < 0)
return (-1);
*portp = htons(*alport);
if (*alport < IPPORT_RESERVED - 1) {
if (bind(s, sa, sa->sa_len) >= 0)
return (s);
if (errno != EADDRINUSE) {
(void)close(s);
return (-1);
}
}
*portp = 0;
sa->sa_family = af;
if (bindresvport_sa(s, sa) == -1) {
(void)close(s);
return (-1);
}
*alport = ntohs(*portp);
return (s);
}
DEF_WEAK(rresvport_af);
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