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