[gssapi-openssh.git] / openssh / 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 1.6 2004/08/13 02:51:48 djm Exp $");

#include <sys/uio.h>

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

void
mm_send_fd(int sock, int fd)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
	struct msghdr msg;
	struct iovec vec;
	char ch = '\0';
	ssize_t 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(sock, &msg, 0)) == -1)
		fatal("%s: sendmsg(%d): %s", __func__, fd,
		    strerror(errno));
	if (n != 1)
		fatal("%s: sendmsg: expected sent 1 got %ld",
		    __func__, (long)n);
#else
	fatal("%s: UsePrivilegeSeparation=yes not supported",
	    __func__);
#endif
}

int
mm_receive_fd(int sock)
{
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
	struct msghdr msg;
	struct iovec vec;
	ssize_t n;
	char ch;
	int fd;
#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(sock, &msg, 0)) == -1)
		fatal("%s: recvmsg: %s", __func__, strerror(errno));
	if (n != 1)
		fatal("%s: recvmsg: expected received 1 got %ld",
		    __func__, (long)n);

#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	if (msg.msg_accrightslen != sizeof(fd))
		fatal("%s: no fd", __func__);
#else
	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg == NULL)
		fatal("%s: no message header", __func__);
#ifndef BROKEN_CMSG_TYPE
	if (cmsg->cmsg_type != SCM_RIGHTS)
		fatal("%s: expected type %d got %d", __func__,
		    SCM_RIGHTS, cmsg->cmsg_type);
#endif
	fd = (*(int *)CMSG_DATA(cmsg));
#endif
	return fd;
#else
	fatal("%s: UsePrivilegeSeparation=yes not supported",
	    __func__);
#endif
}
Commit	Line	Data
826f3a39	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"
7e82606e	27	RCSID("$OpenBSD: monitor_fdpass.c,v 1.6 2004/08/13 02:51:48 djm Exp $");
826f3a39	28
	29	#include <sys/uio.h>
	30
	31	#include "log.h"
	32	#include "monitor_fdpass.h"
	33
	34	void
7e82606e	35	mm_send_fd(int sock, int fd)
826f3a39	36	{
	37	#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	38	struct msghdr msg;
	39	struct iovec vec;
	40	char ch = '\0';
d03f4262	41	ssize_t n;
541874c2	42	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	43	char tmp[CMSG_SPACE(sizeof(int))];
	44	struct cmsghdr *cmsg;
	45	#endif
	46
	47	memset(&msg, 0, sizeof(msg));
541874c2	48	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	49	msg.msg_accrights = (caddr_t)&fd;
	50	msg.msg_accrightslen = sizeof(fd);
	51	#else
	52	msg.msg_control = (caddr_t)tmp;
	53	msg.msg_controllen = CMSG_LEN(sizeof(int));
	54	cmsg = CMSG_FIRSTHDR(&msg);
	55	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	56	cmsg->cmsg_level = SOL_SOCKET;
	57	cmsg->cmsg_type = SCM_RIGHTS;
	58	(int )CMSG_DATA(cmsg) = fd;
	59	#endif
	60
	61	vec.iov_base = &ch;
	62	vec.iov_len = 1;
	63	msg.msg_iov = &vec;
	64	msg.msg_iovlen = 1;
	65
7e82606e	66	if ((n = sendmsg(sock, &msg, 0)) == -1)
44a053a3	67	fatal("%s: sendmsg(%d): %s", __func__, fd,
826f3a39	68	strerror(errno));
826f3a39	69	if (n != 1)
d03f4262	70	fatal("%s: sendmsg: expected sent 1 got %ld",
d03f4262	71	__func__, (long)n);
826f3a39	72	#else
826f3a39	73	fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3	74	__func__);
826f3a39	75	#endif
	76	}
	77
	78	int
7e82606e	79	mm_receive_fd(int sock)
826f3a39	80	{
	81	#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	82	struct msghdr msg;
	83	struct iovec vec;
d03f4262	84	ssize_t n;
826f3a39	85	char ch;
d03f4262	86	int fd;
541874c2	87	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	88	char tmp[CMSG_SPACE(sizeof(int))];
	89	struct cmsghdr *cmsg;
	90	#endif
	91
	92	memset(&msg, 0, sizeof(msg));
	93	vec.iov_base = &ch;
	94	vec.iov_len = 1;
	95	msg.msg_iov = &vec;
	96	msg.msg_iovlen = 1;
541874c2	97	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	98	msg.msg_accrights = (caddr_t)&fd;
	99	msg.msg_accrightslen = sizeof(fd);
	100	#else
	101	msg.msg_control = tmp;
	102	msg.msg_controllen = sizeof(tmp);
	103	#endif
	104
7e82606e	105	if ((n = recvmsg(sock, &msg, 0)) == -1)
44a053a3	106	fatal("%s: recvmsg: %s", __func__, strerror(errno));
826f3a39	107	if (n != 1)
d03f4262	108	fatal("%s: recvmsg: expected received 1 got %ld",
d03f4262	109	__func__, (long)n);
826f3a39	110
541874c2	111	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	112	if (msg.msg_accrightslen != sizeof(fd))
44a053a3	113	fatal("%s: no fd", __func__);
826f3a39	114	#else
826f3a39	115	cmsg = CMSG_FIRSTHDR(&msg);
7e82606e	116	if (cmsg == NULL)
7e82606e	117	fatal("%s: no message header", __func__);
7cac2b65	118	#ifndef BROKEN_CMSG_TYPE
826f3a39	119	if (cmsg->cmsg_type != SCM_RIGHTS)
44a053a3	120	fatal("%s: expected type %d got %d", __func__,
826f3a39	121	SCM_RIGHTS, cmsg->cmsg_type);
7cac2b65	122	#endif
826f3a39	123	fd = ((int )CMSG_DATA(cmsg));
	124	#endif
	125	return fd;
	126	#else
	127	fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3	128	__func__);
826f3a39	129	#endif
826f3a39	130	}