[openssh.git] / openbsd-compat / bindresvport.c

/* This file has be substantially modified from the original OpenBSD source */

/*	$OpenBSD: bindresvport.c,v 1.16 2005/04/01 07:44:03 otto Exp $	*/

/*
 * Copyright 1996, Jason Downs.  All rights reserved.
 * Copyright 1998, Theo de Raadt.  All rights reserved.
 * Copyright 2000, Damien Miller.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/* OPENBSD ORIGINAL: lib/libc/rpc/bindresvport.c */

#include "includes.h"

#ifndef HAVE_BINDRESVPORT_SA

#include "includes.h"

#include <errno.h>
#include <string.h>

#define STARTPORT 600
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS	(ENDPORT - STARTPORT + 1)

/*
 * Bind a socket to a privileged IP port
 */
int
bindresvport_sa(int sd, struct sockaddr *sa)
{
	int error, af;
	struct sockaddr_storage myaddr;
	struct sockaddr_in *sin;
	struct sockaddr_in6 *sin6;
	u_int16_t *portp;
	u_int16_t port;
	socklen_t salen;
	int i;

	if (sa == NULL) {
		memset(&myaddr, 0, sizeof(myaddr));
		sa = (struct sockaddr *)&myaddr;

		if (getsockname(sd, sa, &salen) == -1)
			return -1;	/* errno is correctly set */

		af = sa->sa_family;
		memset(&myaddr, 0, salen);
	} else
		af = sa->sa_family;

	if (af == AF_INET) {
		sin = (struct sockaddr_in *)sa;
		salen = sizeof(struct sockaddr_in);
		portp = &sin->sin_port;
	} else if (af == AF_INET6) {
		sin6 = (struct sockaddr_in6 *)sa;
		salen = sizeof(struct sockaddr_in6);
		portp = &sin6->sin6_port;
	} else {
		errno = EPFNOSUPPORT;
		return (-1);
	}
	sa->sa_family = af;

	port = ntohs(*portp);
	if (port == 0)
		port = (arc4random() % NPORTS) + STARTPORT;

	/* Avoid warning */
	error = -1;

	for(i = 0; i < NPORTS; i++) {
		*portp = htons(port);
		
		error = bind(sd, sa, salen);

		/* Terminate on success */
		if (error == 0)
			break;
			
		/* Terminate on errors, except "address already in use" */
		if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
			break;
			
		port++;
		if (port > ENDPORT)
			port = STARTPORT;
	}

	return (error);
}

#endif /* HAVE_BINDRESVPORT_SA */
Commit	Line	Data
382fe2fa	1	/* This file has be substantially modified from the original OpenBSD source */
382fe2fa	2
295034ce	3	/* $OpenBSD: bindresvport.c,v 1.16 2005/04/01 07:44:03 otto Exp $ */
d7d5f0b2	4
48e671d5	5	/*
382fe2fa	6	* Copyright 1996, Jason Downs. All rights reserved.
	7	* Copyright 1998, Theo de Raadt. All rights reserved.
	8	* Copyright 2000, Damien Miller. All rights reserved.
	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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
	20	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	21	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	22	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	23	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	24	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	25	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	26	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	27	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	28	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48e671d5	29	*/
48e671d5	30
c9d7b187	31	/* OPENBSD ORIGINAL: lib/libc/rpc/bindresvport.c */
c9d7b187	32
17962c40	33	#include "includes.h"
48e671d5	34
d7d5f0b2	35	#ifndef HAVE_BINDRESVPORT_SA
48e671d5	36
48e671d5	37	#include "includes.h"
48e671d5	38
fec71b2f	39	#include <errno.h>
28cb0a43	40	#include <string.h>
fec71b2f	41
48e671d5	42	#define STARTPORT 600
	43	#define ENDPORT (IPPORT_RESERVED - 1)
	44	#define NPORTS (ENDPORT - STARTPORT + 1)
	45
48e671d5	46	/*
	47	* Bind a socket to a privileged IP port
	48	*/
	49	int
295034ce	50	bindresvport_sa(int sd, struct sockaddr *sa)
48e671d5	51	{
d7d5f0b2	52	int error, af;
48e671d5	53	struct sockaddr_storage myaddr;
	54	struct sockaddr_in *sin;
	55	struct sockaddr_in6 *sin6;
	56	u_int16_t *portp;
1e64903d	57	u_int16_t port;
f1c4659d	58	socklen_t salen;
48e671d5	59	int i;
	60
	61	if (sa == NULL) {
	62	memset(&myaddr, 0, sizeof(myaddr));
	63	sa = (struct sockaddr *)&myaddr;
d7d5f0b2	64
	65	if (getsockname(sd, sa, &salen) == -1)
	66	return -1; /* errno is correctly set */
	67
	68	af = sa->sa_family;
	69	memset(&myaddr, 0, salen);
	70	} else
	71	af = sa->sa_family;
48e671d5	72
	73	if (af == AF_INET) {
	74	sin = (struct sockaddr_in *)sa;
	75	salen = sizeof(struct sockaddr_in);
	76	portp = &sin->sin_port;
	77	} else if (af == AF_INET6) {
	78	sin6 = (struct sockaddr_in6 *)sa;
	79	salen = sizeof(struct sockaddr_in6);
	80	portp = &sin6->sin6_port;
	81	} else {
	82	errno = EPFNOSUPPORT;
	83	return (-1);
	84	}
	85	sa->sa_family = af;
	86
1e64903d	87	port = ntohs(*portp);
	88	if (port == 0)
	89	port = (arc4random() % NPORTS) + STARTPORT;
48e671d5	90
717057b6	91	/* Avoid warning */
	92	error = -1;
	93
48e671d5	94	for(i = 0; i < NPORTS; i++) {
1e64903d	95	*portp = htons(port);
1e64903d	96
48e671d5	97	error = bind(sd, sa, salen);
d7d5f0b2	98
f914c7fb	99	/* Terminate on success */
	100	if (error == 0)
	101	break;
	102
	103	/* Terminate on errors, except "address already in use" */
f4a7cf29	104	if ((error < 0) && !((errno == EADDRINUSE) \|\| (errno == EINVAL)))
48e671d5	105	break;
48e671d5	106
1e64903d	107	port++;
	108	if (port > ENDPORT)
	109	port = STARTPORT;
48e671d5	110	}
	111
	112	return (error);
	113	}
	114
d7d5f0b2	115	#endif /* HAVE_BINDRESVPORT_SA */