[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 1.2 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)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
	struct msghdr msg;
	struct iovec vec;
	char ch = '\0';
	int n;
#if !defined(HAVE_ACCRIGHTS_IN_MSGHDR) || \
	(defined(HAVE_ACCRIGHTS_IN_MSGHDR) && defined(HAVE_CONTROL_IN_MSGHDR))
	char tmp[CMSG_SPACE(sizeof(int))];
	struct cmsghdr *cmsg;
#endif

	memset(&msg, 0, sizeof(msg));
#if defined(HAVE_ACCRIGHTS_IN_MSGHDR) && !defined(HAVE_CONTROL_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);
#else
	fatal("%s: UsePrivilegeSeparation=yes not supported",
	    __FUNCTION__);
#endif
}

int
mm_receive_fd(int socket)
{
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
	struct msghdr msg;
	struct iovec vec;
	char ch;
	int fd, n;
#if !defined(HAVE_ACCRIGHTS_IN_MSGHDR) || \
	(defined(HAVE_ACCRIGHTS_IN_MSGHDR) && defined(HAVE_CONTROL_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;
#if defined(HAVE_ACCRIGHTS_IN_MSGHDR) && !defined(HAVE_CONTROL_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);

#if defined(HAVE_ACCRIGHTS_IN_MSGHDR) && !defined(HAVE_CONTROL_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;
#else
	fatal("%s: UsePrivilegeSeparation=yes not supported",
	    __FUNCTION__);
#endif
}
Commit	Line	Data
700318f3	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"
	27	RCSID("$OpenBSD: monitor_fdpass.c,v 1.2 2002/03/24 17:53:16 stevesk Exp $");
	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	#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';
	41	int n;
	42	#if !defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| \
	43	(defined(HAVE_ACCRIGHTS_IN_MSGHDR) && defined(HAVE_CONTROL_IN_MSGHDR))
	44	char tmp[CMSG_SPACE(sizeof(int))];
	45	struct cmsghdr *cmsg;
	46	#endif
	47
	48	memset(&msg, 0, sizeof(msg));
	49	#if defined(HAVE_ACCRIGHTS_IN_MSGHDR) && !defined(HAVE_CONTROL_IN_MSGHDR)
	50	msg.msg_accrights = (caddr_t)&fd;
	51	msg.msg_accrightslen = sizeof(fd);
	52	#else
	53	msg.msg_control = (caddr_t)tmp;
	54	msg.msg_controllen = CMSG_LEN(sizeof(int));
	55	cmsg = CMSG_FIRSTHDR(&msg);
	56	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	57	cmsg->cmsg_level = SOL_SOCKET;
	58	cmsg->cmsg_type = SCM_RIGHTS;
	59	(int )CMSG_DATA(cmsg) = fd;
	60	#endif
	61
	62	vec.iov_base = &ch;
	63	vec.iov_len = 1;
	64	msg.msg_iov = &vec;
65	msg.msg_iovlen = 1;
66
67	if ((n = sendmsg(socket, &msg, 0)) == -1)
68	fatal("%s: sendmsg(%d): %s", __FUNCTION__, fd,
69	strerror(errno));
70	if (n != 1)
71	fatal("%s: sendmsg: expected sent 1 got %d",
72	__FUNCTION__, n);
73	#else
74	fatal("%s: UsePrivilegeSeparation=yes not supported",
75	__FUNCTION__);
76	#endif
77	}
78
79	int
80	mm_receive_fd(int socket)
81	{
82	#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
83	struct msghdr msg;
84	struct iovec vec;
85	char ch;
86	int fd, n;
87	#if !defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| \
88	(defined(HAVE_ACCRIGHTS_IN_MSGHDR) && defined(HAVE_CONTROL_IN_MSGHDR))
89	char tmp[CMSG_SPACE(sizeof(int))];
90	struct cmsghdr *cmsg;
91	#endif
92
93	memset(&msg, 0, sizeof(msg));
94	vec.iov_base = &ch;
95	vec.iov_len = 1;
96	msg.msg_iov = &vec;
97	msg.msg_iovlen = 1;
98	#if defined(HAVE_ACCRIGHTS_IN_MSGHDR) && !defined(HAVE_CONTROL_IN_MSGHDR)
99	msg.msg_accrights = (caddr_t)&fd;
100	msg.msg_accrightslen = sizeof(fd);
101	#else
102	msg.msg_control = tmp;
103	msg.msg_controllen = sizeof(tmp);
104	#endif
105
106	if ((n = recvmsg(socket, &msg, 0)) == -1)
107	fatal("%s: recvmsg: %s", __FUNCTION__, strerror(errno));
108	if (n != 1)
109	fatal("%s: recvmsg: expected received 1 got %d",
110	__FUNCTION__, n);
111
112	#if defined(HAVE_ACCRIGHTS_IN_MSGHDR) && !defined(HAVE_CONTROL_IN_MSGHDR)
113	if (msg.msg_accrightslen != sizeof(fd))
114	fatal("%s: no fd", __FUNCTION__);
115	#else
116	cmsg = CMSG_FIRSTHDR(&msg);
117	if (cmsg->cmsg_type != SCM_RIGHTS)
118	fatal("%s: expected type %d got %d", __FUNCTION__,
119	SCM_RIGHTS, cmsg->cmsg_type);
120	fd = ((int )CMSG_DATA(cmsg));
121	#endif
122	return fd;
123	#else
124	fatal("%s: UsePrivilegeSeparation=yes not supported",
125	__FUNCTION__);
126	#endif
127	}