openssh/monitor_fdpass.c

/* $OpenBSD: monitor_fdpass.c,v 1.22 2020/10/18 11:32:01 djm 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>

#ifdef HAVE_POLL_H
# include <poll.h>
#else
# ifdef HAVE_SYS_POLL_H
#  include <sys/poll.h>
# endif
#endif

#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;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	union {
		struct cmsghdr hdr;
		char buf[CMSG_SPACE(sizeof(int))];
	} cmsgbuf;
	struct cmsghdr *cmsg;
#endif
	struct iovec vec;
	char ch = '\0';
	ssize_t n;
	struct pollfd pfd;

	memset(&msg, 0, sizeof(msg));
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	msg.msg_accrights = (caddr_t)&fd;
	msg.msg_accrightslen = sizeof(fd);
#else
	memset(&cmsgbuf, 0, sizeof(cmsgbuf));
	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;

	pfd.fd = sock;
	pfd.events = POLLOUT;
	while ((n = sendmsg(sock, &msg, 0)) == -1 &&
	    (errno == EAGAIN || errno == EINTR)) {
		debug3_f("sendmsg(%d): %s", fd, strerror(errno));
		(void)poll(&pfd, 1, -1);
	}
	if (n == -1) {
		error_f("sendmsg(%d): %s", fd, strerror(errno));
		return -1;
	}

	if (n != 1) {
		error_f("sendmsg: expected sent 1 got %zd", 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;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	union {
		struct cmsghdr hdr;
		char buf[CMSG_SPACE(sizeof(int))];
	} cmsgbuf;
	struct cmsghdr *cmsg;
#endif
	struct iovec vec;
	ssize_t n;
	char ch;
	int fd;
	struct pollfd pfd;

	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
	memset(&cmsgbuf, 0, sizeof(cmsgbuf));
	msg.msg_control = &cmsgbuf.buf;
	msg.msg_controllen = sizeof(cmsgbuf.buf);
#endif

	pfd.fd = sock;
	pfd.events = POLLIN;
	while ((n = recvmsg(sock, &msg, 0)) == -1 &&
	    (errno == EAGAIN || errno == EINTR)) {
		debug3_f("recvmsg: %s", strerror(errno));
		(void)poll(&pfd, 1, -1);
	}
	if (n == -1) {
		error_f("recvmsg: %s", strerror(errno));
		return -1;
	}

	if (n != 1) {
		error_f("recvmsg: expected received 1 got %zd", n);
		return -1;
	}

#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	if (msg.msg_accrightslen != sizeof(fd)) {
		error_f("no fd");
		return -1;
	}
#else
	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg == NULL) {
		error_f("no message header");
		return -1;
	}

#ifndef BROKEN_CMSG_TYPE
	if (cmsg->cmsg_type != SCM_RIGHTS) {
		error_f("expected %d got %d", SCM_RIGHTS, cmsg->cmsg_type);
		return -1;
	}
#endif
	fd = (*(int *)CMSG_DATA(cmsg));
#endif
	return fd;
#else
	error_f("file descriptor passing not supported");
	return -1;
#endif
}