[openssh.git] / bsd-bindresvport.c

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#include "config.h"

#ifndef HAVE_BINRESVPORT_AF

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: bindresvport.c,v 1.11 1999/12/17 19:22:08 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */

/*
 * Copyright (c) 1987 by Sun Microsystems, Inc.
 *
 * Portions Copyright(C) 1996, Jason Downs.  All rights reserved.
 */

#include "includes.h"

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

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

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

	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;

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

	for(i = 0; i < NPORTS; i++) {
		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;
			
		*portp = (i % NPORTS) + STARTPORT;
	}

	return (error);
}

#endif /* HAVE_BINRESVPORT_AF */
Commit	Line	Data
48e671d5	1	/*
	2	* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
	3	* unrestricted use provided that this legend is included on all tape
	4	* media and as a part of the software program in whole or part. Users
	5	* may copy or modify Sun RPC without charge, but are not authorized
	6	* to license or distribute it to anyone else except as part of a product or
	7	* program developed by the user.
	8	*
	9	* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
	10	* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
	11	* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
	12	*
	13	* Sun RPC is provided with no support and without any obligation on the
	14	* part of Sun Microsystems, Inc. to assist in its use, correction,
	15	* modification or enhancement.
	16	*
	17	* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
	18	* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
	19	* OR ANY PART THEREOF.
	20	*
	21	* In no event will Sun Microsystems, Inc. be liable for any lost revenue
	22	* or profits or other special, indirect and consequential damages, even if
	23	* Sun has been advised of the possibility of such damages.
	24	*
	25	* Sun Microsystems, Inc.
	26	* 2550 Garcia Avenue
	27	* Mountain View, California 94043
	28	*/
	29
	30	#include "config.h"
	31
	32	#ifndef HAVE_BINRESVPORT_AF
	33
	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char *rcsid = "$OpenBSD: bindresvport.c,v 1.11 1999/12/17 19:22:08 deraadt Exp $";
	36	#endif /* LIBC_SCCS and not lint */
	37
	38	/*
	39	* Copyright (c) 1987 by Sun Microsystems, Inc.
	40	*
	41	* Portions Copyright(C) 1996, Jason Downs. All rights reserved.
	42	*/
	43
	44	#include "includes.h"
	45
	46	#define STARTPORT 600
	47	#define ENDPORT (IPPORT_RESERVED - 1)
	48	#define NPORTS (ENDPORT - STARTPORT + 1)
	49
48e671d5	50	/*
	51	* Bind a socket to a privileged IP port
	52	*/
	53	int
	54	bindresvport_af(sd, sa, af)
	55	int sd;
	56	struct sockaddr *sa;
	57	int af;
	58	{
	59	int error;
	60	struct sockaddr_storage myaddr;
	61	struct sockaddr_in *sin;
	62	struct sockaddr_in6 *sin6;
	63	u_int16_t *portp;
	64	int salen;
	65	int i;
	66
	67	if (sa == NULL) {
	68	memset(&myaddr, 0, sizeof(myaddr));
	69	sa = (struct sockaddr *)&myaddr;
	70	}
	71
	72	if (af == AF_INET) {
	73	sin = (struct sockaddr_in *)sa;
	74	salen = sizeof(struct sockaddr_in);
	75	portp = &sin->sin_port;
	76	} else if (af == AF_INET6) {
	77	sin6 = (struct sockaddr_in6 *)sa;
	78	salen = sizeof(struct sockaddr_in6);
	79	portp = &sin6->sin6_port;
	80	} else {
	81	errno = EPFNOSUPPORT;
	82	return (-1);
	83	}
	84	sa->sa_family = af;
	85
	86	if (*portp == 0)
f914c7fb	87	*portp = (arc4random() % NPORTS) + STARTPORT;
48e671d5	88
	89	for(i = 0; i < NPORTS; i++) {
	90	error = bind(sd, sa, salen);
f914c7fb	91
	92	/* Terminate on success */
	93	if (error == 0)
	94	break;
	95
	96	/* Terminate on errors, except "address already in use" */
	97	if ((error < 0) && ((errno != EADDRINUSE) \|\| (errno != EINVAL)))
48e671d5	98	break;
48e671d5	99
f914c7fb	100	*portp = (i % NPORTS) + STARTPORT;
48e671d5	101	}
	102
	103	return (error);
	104	}
	105
	106	#endif /* HAVE_BINRESVPORT_AF */