[gssapi-openssh.git] / openssh / monitor_fdpass.c

/* $OpenBSD: monitor_fdpass.c,v 1.17 2008/03/24 16:11:07 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))];
		char buf[CMSG_SPACE(sizeof(int))];
	} cmsgbuf;
	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)&cmsgbuf.buf;
	msg.msg_controllen = sizeof(cmsgbuf.buf);
	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 {
		struct cmsghdr hdr;
		char buf[CMSG_SPACE(sizeof(int))];
	} cmsgbuf;
	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 = &cmsgbuf.buf;
	msg.msg_controllen = sizeof(cmsgbuf.buf);
#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
47686178	1	/* $OpenBSD: monitor_fdpass.c,v 1.17 2008/03/24 16:11:07 deraadt Exp $ */
700318f3	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"
700318f3	28
9108f8d9	29	#include <sys/types.h>
9108f8d9	30	#include <sys/socket.h>
700318f3	31	#include <sys/uio.h>
ff7ec503	32	#ifdef HAVE_SYS_UN_H
	33	#include <sys/un.h>
	34	#endif
700318f3	35
9108f8d9	36	#include <errno.h>
	37	#include <string.h>
	38	#include <stdarg.h>
	39
700318f3	40	#include "log.h"
	41	#include "monitor_fdpass.h"
	42
47686178	43	int
c9f39d2c	44	mm_send_fd(int sock, int fd)
700318f3	45	{
	46	#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	47	struct msghdr msg;
	48	struct iovec vec;
	49	char ch = '\0';
41b2f314	50	ssize_t n;
fba3c309	51	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
47686178	52	union {
	53	struct cmsghdr hdr;
	54	char tmp[CMSG_SPACE(sizeof(int))];
	55	char buf[CMSG_SPACE(sizeof(int))];
	56	} cmsgbuf;
700318f3	57	struct cmsghdr *cmsg;
	58	#endif
	59
	60	memset(&msg, 0, sizeof(msg));
fba3c309	61	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	62	msg.msg_accrights = (caddr_t)&fd;
	63	msg.msg_accrightslen = sizeof(fd);
	64	#else
47686178	65	msg.msg_control = (caddr_t)&cmsgbuf.buf;
47686178	66	msg.msg_controllen = sizeof(cmsgbuf.buf);
700318f3	67	cmsg = CMSG_FIRSTHDR(&msg);
	68	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	69	cmsg->cmsg_level = SOL_SOCKET;
	70	cmsg->cmsg_type = SCM_RIGHTS;
	71	(int )CMSG_DATA(cmsg) = fd;
	72	#endif
	73
	74	vec.iov_base = &ch;
	75	vec.iov_len = 1;
	76	msg.msg_iov = &vec;
	77	msg.msg_iovlen = 1;
	78
47686178	79	if ((n = sendmsg(sock, &msg, 0)) == -1) {
47686178	80	error("%s: sendmsg(%d): %s", __func__, fd,
700318f3	81	strerror(errno));
47686178	82	return -1;
	83	}
	84
	85	if (n != 1) {
	86	error("%s: sendmsg: expected sent 1 got %ld",
41b2f314	87	__func__, (long)n);
47686178	88	return -1;
	89	}
	90	return 0;
700318f3	91	#else
47686178	92	error("%s: file descriptor passing not supported", __func__);
47686178	93	return -1;
700318f3	94	#endif
	95	}
	96
	97	int
c9f39d2c	98	mm_receive_fd(int sock)
700318f3	99	{
	100	#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	101	struct msghdr msg;
	102	struct iovec vec;
41b2f314	103	ssize_t n;
700318f3	104	char ch;
41b2f314	105	int fd;
fba3c309	106	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
47686178	107	union {
	108	struct cmsghdr hdr;
	109	char buf[CMSG_SPACE(sizeof(int))];
	110	} cmsgbuf;
700318f3	111	struct cmsghdr *cmsg;
	112	#endif
	113
	114	memset(&msg, 0, sizeof(msg));
	115	vec.iov_base = &ch;
	116	vec.iov_len = 1;
	117	msg.msg_iov = &vec;
	118	msg.msg_iovlen = 1;
fba3c309	119	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	120	msg.msg_accrights = (caddr_t)&fd;
	121	msg.msg_accrightslen = sizeof(fd);
	122	#else
47686178	123	msg.msg_control = &cmsgbuf.buf;
47686178	124	msg.msg_controllen = sizeof(cmsgbuf.buf);
700318f3	125	#endif
700318f3	126
47686178	127	if ((n = recvmsg(sock, &msg, 0)) == -1) {
	128	error("%s: recvmsg: %s", __func__, strerror(errno));
	129	return -1;
	130	}
	131	if (n != 1) {
	132	error("%s: recvmsg: expected received 1 got %ld",
41b2f314	133	__func__, (long)n);
47686178	134	return -1;
47686178	135	}
700318f3	136
fba3c309	137	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
47686178	138	if (msg.msg_accrightslen != sizeof(fd)) {
	139	error("%s: no fd", __func__);
	140	return -1;
	141	}
700318f3	142	#else
700318f3	143	cmsg = CMSG_FIRSTHDR(&msg);
47686178	144	if (cmsg == NULL) {
	145	error("%s: no message header", __func__);
	146	return -1;
	147	}
0fff78ff	148	#ifndef BROKEN_CMSG_TYPE
47686178	149	if (cmsg->cmsg_type != SCM_RIGHTS) {
47686178	150	error("%s: expected type %d got %d", __func__,
700318f3	151	SCM_RIGHTS, cmsg->cmsg_type);
47686178	152	return -1;
47686178	153	}
0fff78ff	154	#endif
700318f3	155	fd = ((int )CMSG_DATA(cmsg));
	156	#endif
	157	return fd;
	158	#else
47686178	159	error("%s: file descriptor passing not supported", __func__);
47686178	160	return -1;
700318f3	161	#endif
700318f3	162	}