[openssh.git] / monitor_fdpass.c

/*
 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
 * 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.
 */

#include "includes.h"
RCSID("$OpenBSD: monitor_fdpass.c,v 1.2 2002/03/24 17:53:16 stevesk Exp $");

#include <sys/uio.h>

#include "log.h"
#include "monitor_fdpass.h"

void
mm_send_fd(int socket, int fd)
{
	struct msghdr msg;
	struct iovec vec;
	char ch = '\0';
	int n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	char tmp[CMSG_SPACE(sizeof(int))];
	struct cmsghdr *cmsg;
#endif

	memset(&msg, 0, sizeof(msg));
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	msg.msg_accrights = (caddr_t)&fd;
	msg.msg_accrightslen = sizeof(fd);
#else
	msg.msg_control = (caddr_t)tmp;
	msg.msg_controllen = CMSG_LEN(sizeof(int));
	cmsg = CMSG_FIRSTHDR(&msg);
	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	cmsg->cmsg_level = SOL_SOCKET;
	cmsg->cmsg_type = SCM_RIGHTS;
	*(int *)CMSG_DATA(cmsg) = fd;
#endif

	vec.iov_base = &ch;
	vec.iov_len = 1;
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;

	if ((n = sendmsg(socket, &msg, 0)) == -1)
		fatal("%s: sendmsg(%d): %s", __FUNCTION__, fd,
		    strerror(errno));
	if (n != 1)
		fatal("%s: sendmsg: expected sent 1 got %d",
		    __FUNCTION__, n);
}

int
mm_receive_fd(int socket)
{
	struct msghdr msg;
	struct iovec vec;
	char ch;
	int fd, n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	char tmp[CMSG_SPACE(sizeof(int))];
	struct cmsghdr *cmsg;
#endif

	memset(&msg, 0, sizeof(msg));
	vec.iov_base = &ch;
	vec.iov_len = 1;
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	msg.msg_accrights = (caddr_t)&fd;
	msg.msg_accrightslen = sizeof(fd);
#else
	msg.msg_control = tmp;
	msg.msg_controllen = sizeof(tmp);
#endif

	if ((n = recvmsg(socket, &msg, 0)) == -1)
		fatal("%s: recvmsg: %s", __FUNCTION__, strerror(errno));
	if (n != 1)
		fatal("%s: recvmsg: expected received 1 got %d",
		    __FUNCTION__, n);

#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	if (msg.msg_accrightslen != sizeof(fd))
		fatal("%s: no fd", __FUNCTION__);
#else
	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg->cmsg_type != SCM_RIGHTS)
		fatal("%s: expected type %d got %d", __FUNCTION__,
		    SCM_RIGHTS, cmsg->cmsg_type);
	fd = (*(int *)CMSG_DATA(cmsg));
#endif
	return fd;
}
Commit	Line	Data
1853d1ef	1	/*
	2	* Copyright 2001 Niels Provos <provos@citi.umich.edu>
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "includes.h"
d4355079	27	RCSID("$OpenBSD: monitor_fdpass.c,v 1.2 2002/03/24 17:53:16 stevesk Exp $");
1853d1ef	28
	29	#include <sys/uio.h>
	30
	31	#include "log.h"
	32	#include "monitor_fdpass.h"
	33
	34	void
	35	mm_send_fd(int socket, int fd)
	36	{
	37	struct msghdr msg;
1853d1ef	38	struct iovec vec;
d4355079	39	char ch = '\0';
d4355079	40	int n;
dc90b259	41	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	42	char tmp[CMSG_SPACE(sizeof(int))];
	43	struct cmsghdr *cmsg;
	44	#endif
1853d1ef	45
1853d1ef	46	memset(&msg, 0, sizeof(msg));
dc90b259	47	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	48	msg.msg_accrights = (caddr_t)&fd;
	49	msg.msg_accrightslen = sizeof(fd);
	50	#else
1853d1ef	51	msg.msg_control = (caddr_t)tmp;
	52	msg.msg_controllen = CMSG_LEN(sizeof(int));
	53	cmsg = CMSG_FIRSTHDR(&msg);
	54	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	55	cmsg->cmsg_level = SOL_SOCKET;
	56	cmsg->cmsg_type = SCM_RIGHTS;
	57	(int )CMSG_DATA(cmsg) = fd;
dc90b259	58	#endif
1853d1ef	59
	60	vec.iov_base = &ch;
	61	vec.iov_len = 1;
	62	msg.msg_iov = &vec;
	63	msg.msg_iovlen = 1;
	64
d4355079	65	if ((n = sendmsg(socket, &msg, 0)) == -1)
	66	fatal("%s: sendmsg(%d): %s", __FUNCTION__, fd,
	67	strerror(errno));
	68	if (n != 1)
	69	fatal("%s: sendmsg: expected sent 1 got %d",
	70	__FUNCTION__, n);
1853d1ef	71	}
	72
	73	int
	74	mm_receive_fd(int socket)
	75	{
	76	struct msghdr msg;
1853d1ef	77	struct iovec vec;
1853d1ef	78	char ch;
d4355079	79	int fd, n;
dc90b259	80	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	81	char tmp[CMSG_SPACE(sizeof(int))];
	82	struct cmsghdr *cmsg;
dc90b259	83	#endif
1853d1ef	84
	85	memset(&msg, 0, sizeof(msg));
	86	vec.iov_base = &ch;
	87	vec.iov_len = 1;
	88	msg.msg_iov = &vec;
	89	msg.msg_iovlen = 1;
dc90b259	90	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	91	msg.msg_accrights = (caddr_t)&fd;
	92	msg.msg_accrightslen = sizeof(fd);
	93	#else
1853d1ef	94	msg.msg_control = tmp;
1853d1ef	95	msg.msg_controllen = sizeof(tmp);
dc90b259	96	#endif
1853d1ef	97
d4355079	98	if ((n = recvmsg(socket, &msg, 0)) == -1)
	99	fatal("%s: recvmsg: %s", __FUNCTION__, strerror(errno));
	100	if (n != 1)
	101	fatal("%s: recvmsg: expected received 1 got %d",
	102	__FUNCTION__, n);
1853d1ef	103
dc90b259	104	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	105	if (msg.msg_accrightslen != sizeof(fd))
	106	fatal("%s: no fd", __FUNCTION__);
dc90b259	107	#else
1853d1ef	108	cmsg = CMSG_FIRSTHDR(&msg);
	109	if (cmsg->cmsg_type != SCM_RIGHTS)
	110	fatal("%s: expected type %d got %d", __FUNCTION__,
	111	SCM_RIGHTS, cmsg->cmsg_type);
d4355079	112	fd = ((int )CMSG_DATA(cmsg));
dc90b259	113	#endif
d4355079	114	return fd;
1853d1ef	115	}