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

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

/*	$OpenBSD: bindresvport.c,v 1.17 2005/12/21 01:40:22 millert 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 <arpa/inet.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 *in;
	struct sockaddr_in6 *in6;
	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) {
		in = (struct sockaddr_in *)sa;
		salen = sizeof(struct sockaddr_in);
		portp = &in->sin_port;
	} else if (af == AF_INET6) {
		in6 = (struct sockaddr_in6 *)sa;
		salen = sizeof(struct sockaddr_in6);
		portp = &in6->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
882d4fb0	3	/* $OpenBSD: bindresvport.c,v 1.17 2005/12/21 01:40:22 millert 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>
5e837c7b	40	#include <arpa/inet.h>
48e671d5	41
fec71b2f	42	#include <errno.h>
28cb0a43	43	#include <string.h>
fec71b2f	44
48e671d5	45	#define STARTPORT 600
	46	#define ENDPORT (IPPORT_RESERVED - 1)
	47	#define NPORTS (ENDPORT - STARTPORT + 1)
	48
48e671d5	49	/*
	50	* Bind a socket to a privileged IP port
	51	*/
	52	int
295034ce	53	bindresvport_sa(int sd, struct sockaddr *sa)
48e671d5	54	{
d7d5f0b2	55	int error, af;
48e671d5	56	struct sockaddr_storage myaddr;
6c6bb9a6	57	struct sockaddr_in *in;
6c6bb9a6	58	struct sockaddr_in6 *in6;
48e671d5	59	u_int16_t *portp;
1e64903d	60	u_int16_t port;
f1c4659d	61	socklen_t salen;
48e671d5	62	int i;
	63
	64	if (sa == NULL) {
	65	memset(&myaddr, 0, sizeof(myaddr));
	66	sa = (struct sockaddr *)&myaddr;
d7d5f0b2	67
	68	if (getsockname(sd, sa, &salen) == -1)
	69	return -1; /* errno is correctly set */
	70
	71	af = sa->sa_family;
	72	memset(&myaddr, 0, salen);
	73	} else
	74	af = sa->sa_family;
48e671d5	75
48e671d5	76	if (af == AF_INET) {
6c6bb9a6	77	in = (struct sockaddr_in *)sa;
48e671d5	78	salen = sizeof(struct sockaddr_in);
6c6bb9a6	79	portp = &in->sin_port;
48e671d5	80	} else if (af == AF_INET6) {
6c6bb9a6	81	in6 = (struct sockaddr_in6 *)sa;
48e671d5	82	salen = sizeof(struct sockaddr_in6);
6c6bb9a6	83	portp = &in6->sin6_port;
48e671d5	84	} else {
	85	errno = EPFNOSUPPORT;
	86	return (-1);
	87	}
	88	sa->sa_family = af;
	89
1e64903d	90	port = ntohs(*portp);
	91	if (port == 0)
	92	port = (arc4random() % NPORTS) + STARTPORT;
48e671d5	93
717057b6	94	/* Avoid warning */
	95	error = -1;
	96
48e671d5	97	for(i = 0; i < NPORTS; i++) {
1e64903d	98	*portp = htons(port);
1e64903d	99
48e671d5	100	error = bind(sd, sa, salen);
d7d5f0b2	101
f914c7fb	102	/* Terminate on success */
	103	if (error == 0)
	104	break;
	105
	106	/* Terminate on errors, except "address already in use" */
f4a7cf29	107	if ((error < 0) && !((errno == EADDRINUSE) \|\| (errno == EINVAL)))
48e671d5	108	break;
48e671d5	109
1e64903d	110	port++;
	111	if (port > ENDPORT)
	112	port = STARTPORT;
48e671d5	113	}
	114
	115	return (error);
	116	}
	117
d7d5f0b2	118	#endif /* HAVE_BINDRESVPORT_SA */