[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 <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.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
aa751414	36	#include <sys/types.h>
aa751414	37	#include <sys/socket.h>
48e671d5	38
aa751414	39	#include <netinet/in.h>
48e671d5	40
fec71b2f	41	#include <errno.h>
28cb0a43	42	#include <string.h>
fec71b2f	43
48e671d5	44	#define STARTPORT 600
	45	#define ENDPORT (IPPORT_RESERVED - 1)
	46	#define NPORTS (ENDPORT - STARTPORT + 1)
	47
48e671d5	48	/*
	49	* Bind a socket to a privileged IP port
	50	*/
	51	int
295034ce	52	bindresvport_sa(int sd, struct sockaddr *sa)
48e671d5	53	{
d7d5f0b2	54	int error, af;
48e671d5	55	struct sockaddr_storage myaddr;
	56	struct sockaddr_in *sin;
	57	struct sockaddr_in6 *sin6;
	58	u_int16_t *portp;
1e64903d	59	u_int16_t port;
f1c4659d	60	socklen_t salen;
48e671d5	61	int i;
	62
	63	if (sa == NULL) {
	64	memset(&myaddr, 0, sizeof(myaddr));
	65	sa = (struct sockaddr *)&myaddr;
d7d5f0b2	66
	67	if (getsockname(sd, sa, &salen) == -1)
	68	return -1; /* errno is correctly set */
	69
	70	af = sa->sa_family;
	71	memset(&myaddr, 0, salen);
	72	} else
	73	af = sa->sa_family;
48e671d5	74
	75	if (af == AF_INET) {
	76	sin = (struct sockaddr_in *)sa;
	77	salen = sizeof(struct sockaddr_in);
	78	portp = &sin->sin_port;
	79	} else if (af == AF_INET6) {
	80	sin6 = (struct sockaddr_in6 *)sa;
	81	salen = sizeof(struct sockaddr_in6);
	82	portp = &sin6->sin6_port;
	83	} else {
	84	errno = EPFNOSUPPORT;
	85	return (-1);
	86	}
	87	sa->sa_family = af;
	88
1e64903d	89	port = ntohs(*portp);
	90	if (port == 0)
	91	port = (arc4random() % NPORTS) + STARTPORT;
48e671d5	92
717057b6	93	/* Avoid warning */
	94	error = -1;
	95
48e671d5	96	for(i = 0; i < NPORTS; i++) {
1e64903d	97	*portp = htons(port);
1e64903d	98
48e671d5	99	error = bind(sd, sa, salen);
d7d5f0b2	100
f914c7fb	101	/* Terminate on success */
	102	if (error == 0)
	103	break;
	104
	105	/* Terminate on errors, except "address already in use" */
f4a7cf29	106	if ((error < 0) && !((errno == EADDRINUSE) \|\| (errno == EINVAL)))
48e671d5	107	break;
48e671d5	108
1e64903d	109	port++;
	110	if (port > ENDPORT)
	111	port = STARTPORT;
48e671d5	112	}
	113
	114	return (error);
	115	}
	116
d7d5f0b2	117	#endif /* HAVE_BINDRESVPORT_SA */