[openssh.git] / monitor_fdpass.c

/* $OpenBSD: monitor_fdpass.c,v 1.14 2008/03/02 18:19:35 deraadt Exp $ */
/*
 * 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"

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif

#include <errno.h>
#include <string.h>
#include <stdarg.h>

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

int
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
	union {
		struct cmsghdr hdr;
		char tmp[CMSG_SPACE(sizeof(int))];
	} tmp;
	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) {
		error("%s: sendmsg(%d): %s", __func__, fd,
		    strerror(errno));
		return -1;
	}

	if (n != 1) {
		error("%s: sendmsg: expected sent 1 got %ld",
		    __func__, (long)n);
		return -1;
	}
	return 0;
#else
	error("%s: file descriptor passing not supported", __func__);
	return -1;
#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
	union {
		char tmp[CMSG_SPACE(sizeof(int))];
		struct cmsghdr hdr;
	} tmp;
	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) {
		error("%s: recvmsg: %s", __func__, strerror(errno));
		return -1;
	}
	if (n != 1) {
		error("%s: recvmsg: expected received 1 got %ld",
		    __func__, (long)n);
		return -1;
	}

#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	if (msg.msg_accrightslen != sizeof(fd)) {
		error("%s: no fd", __func__);
		return -1;
	}
#else
	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg == NULL) {
		error("%s: no message header", __func__);
		return -1;
	}
#ifndef BROKEN_CMSG_TYPE
	if (cmsg->cmsg_type != SCM_RIGHTS) {
		error("%s: expected type %d got %d", __func__,
		    SCM_RIGHTS, cmsg->cmsg_type);
		return -1;
	}
#endif
	fd = (*(int *)CMSG_DATA(cmsg));
#endif
	return fd;
#else
	error("%s: file descriptor passing not supported", __func__);
	return -1;
#endif
}
Commit	Line	Data
0c9a63f1	1	/* $OpenBSD: monitor_fdpass.c,v 1.14 2008/03/02 18:19:35 deraadt Exp $ */
1853d1ef	2	/*
	3	* Copyright 2001 Niels Provos <provos@citi.umich.edu>
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
	27	#include "includes.h"
1853d1ef	28
5b04a8bf	29	#include <sys/types.h>
5b04a8bf	30	#include <sys/socket.h>
1853d1ef	31	#include <sys/uio.h>
8153fef1	32	#ifdef HAVE_SYS_UN_H
	33	#include <sys/un.h>
	34	#endif
1853d1ef	35
028094f4	36	#include <errno.h>
00146caa	37	#include <string.h>
31652869	38	#include <stdarg.h>
028094f4	39
1853d1ef	40	#include "log.h"
	41	#include "monitor_fdpass.h"
	42
8de7aaab	43	int
ca75d7de	44	mm_send_fd(int sock, int fd)
1853d1ef	45	{
1b06e75e	46	#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
1853d1ef	47	struct msghdr msg;
1853d1ef	48	struct iovec vec;
d4355079	49	char ch = '\0';
63b5f1a1	50	ssize_t n;
637f9177	51	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
0c9a63f1	52	union {
	53	struct cmsghdr hdr;
	54	char tmp[CMSG_SPACE(sizeof(int))];
	55	} tmp;
dc90b259	56	struct cmsghdr *cmsg;
dc90b259	57	#endif
1853d1ef	58
1853d1ef	59	memset(&msg, 0, sizeof(msg));
637f9177	60	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
dc90b259	61	msg.msg_accrights = (caddr_t)&fd;
	62	msg.msg_accrightslen = sizeof(fd);
	63	#else
0c9a63f1	64	msg.msg_control = (caddr_t)&tmp;
1853d1ef	65	msg.msg_controllen = CMSG_LEN(sizeof(int));
	66	cmsg = CMSG_FIRSTHDR(&msg);
	67	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	68	cmsg->cmsg_level = SOL_SOCKET;
	69	cmsg->cmsg_type = SCM_RIGHTS;
	70	(int )CMSG_DATA(cmsg) = fd;
dc90b259	71	#endif
1853d1ef	72
	73	vec.iov_base = &ch;
	74	vec.iov_len = 1;
	75	msg.msg_iov = &vec;
	76	msg.msg_iovlen = 1;
	77
8de7aaab	78	if ((n = sendmsg(sock, &msg, 0)) == -1) {
8de7aaab	79	error("%s: sendmsg(%d): %s", __func__, fd,
d4355079	80	strerror(errno));
8de7aaab	81	return -1;
	82	}
	83
	84	if (n != 1) {
	85	error("%s: sendmsg: expected sent 1 got %ld",
63b5f1a1	86	__func__, (long)n);
8de7aaab	87	return -1;
	88	}
	89	return 0;
84071420	90	#else
8de7aaab	91	error("%s: file descriptor passing not supported", __func__);
8de7aaab	92	return -1;
84071420	93	#endif
1853d1ef	94	}
	95
	96	int
ca75d7de	97	mm_receive_fd(int sock)
1853d1ef	98	{
1b06e75e	99	#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
1853d1ef	100	struct msghdr msg;
1853d1ef	101	struct iovec vec;
63b5f1a1	102	ssize_t n;
1853d1ef	103	char ch;
63b5f1a1	104	int fd;
637f9177	105	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
0c9a63f1	106	union {
	107	char tmp[CMSG_SPACE(sizeof(int))];
	108	struct cmsghdr hdr;
	109	} tmp;
dc90b259	110	struct cmsghdr *cmsg;
dc90b259	111	#endif
1853d1ef	112
	113	memset(&msg, 0, sizeof(msg));
	114	vec.iov_base = &ch;
	115	vec.iov_len = 1;
	116	msg.msg_iov = &vec;
	117	msg.msg_iovlen = 1;
637f9177	118	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
dc90b259	119	msg.msg_accrights = (caddr_t)&fd;
	120	msg.msg_accrightslen = sizeof(fd);
	121	#else
0c9a63f1	122	msg.msg_control = &tmp;
1853d1ef	123	msg.msg_controllen = sizeof(tmp);
dc90b259	124	#endif
1853d1ef	125
8de7aaab	126	if ((n = recvmsg(sock, &msg, 0)) == -1) {
	127	error("%s: recvmsg: %s", __func__, strerror(errno));
	128	return -1;
	129	}
	130	if (n != 1) {
	131	error("%s: recvmsg: expected received 1 got %ld",
63b5f1a1	132	__func__, (long)n);
8de7aaab	133	return -1;
8de7aaab	134	}
1853d1ef	135
637f9177	136	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
8de7aaab	137	if (msg.msg_accrightslen != sizeof(fd)) {
	138	error("%s: no fd", __func__);
	139	return -1;
	140	}
dc90b259	141	#else
1853d1ef	142	cmsg = CMSG_FIRSTHDR(&msg);
8de7aaab	143	if (cmsg == NULL) {
	144	error("%s: no message header", __func__);
	145	return -1;
	146	}
bf7c1e6c	147	#ifndef BROKEN_CMSG_TYPE
8de7aaab	148	if (cmsg->cmsg_type != SCM_RIGHTS) {
8de7aaab	149	error("%s: expected type %d got %d", __func__,
1853d1ef	150	SCM_RIGHTS, cmsg->cmsg_type);
8de7aaab	151	return -1;
8de7aaab	152	}
bf7c1e6c	153	#endif
d4355079	154	fd = ((int )CMSG_DATA(cmsg));
dc90b259	155	#endif
d4355079	156	return fd;
84071420	157	#else
8de7aaab	158	error("%s: file descriptor passing not supported", __func__);
8de7aaab	159	return -1;
84071420	160	#endif
1853d1ef	161	}