xref: /src/crypto/external/bsd/openssh/dist/monitor_fdpass.c

/*	$NetBSD: monitor_fdpass.c,v 1.10 2026/04/08 18:58:41 christos Exp $	*/
/* $OpenBSD: monitor_fdpass.c,v 1.23 2026/02/08 19:54:31 dtucker Exp $ */

/*
 * Copyright 2001 Niels Provos <provos (at) 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("$NetBSD: monitor_fdpass.c,v 1.10 2026/04/08 18:58:41 christos Exp $");
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>

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

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

int
mm_send_fd(int sock, int fd)
{
	struct msghdr msg;
	union {
		struct cmsghdr hdr;
		char buf[1024];
	} cmsgbuf;
	struct cmsghdr *cmsg;
	struct iovec vec;
	char ch = '\0';
	ssize_t n;
	struct pollfd pfd;

	if (sizeof(cmsgbuf.buf) < CMSG_SPACE(sizeof(int))) {
		error("%s: %zu < %zu, recompile", __func__,
		    sizeof(cmsgbuf.buf), CMSG_SPACE(sizeof(int)));
		return -1;
	}

	memset(&msg, 0, sizeof(msg));
	memset(&cmsgbuf, 0, sizeof(cmsgbuf));
	msg.msg_control = &cmsgbuf.buf;
	msg.msg_controllen = CMSG_SPACE(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;
	msg.msg_controllen = cmsg->cmsg_len;

	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;
}

int
mm_receive_fd(int sock)
{
	struct msghdr msg;
	union {
		struct cmsghdr hdr;
		char buf[1024];
	} cmsgbuf;
	struct cmsghdr *cmsg;
	struct iovec vec;
	ssize_t n;
	char ch;
	int fd;
	struct pollfd pfd;

	if (sizeof(cmsgbuf.buf) < CMSG_SPACE(sizeof(int))) {
		error("%s: %zu < %zu, recompile", __func__,
		    sizeof(cmsgbuf.buf), CMSG_SPACE(sizeof(int)));
		return -1;
	}

	memset(&msg, 0, sizeof(msg));
	memset(&cmsgbuf, 0, sizeof(cmsgbuf));
	vec.iov_base = &ch;
	vec.iov_len = 1;
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;
	msg.msg_control = &cmsgbuf.buf;
	msg.msg_controllen = CMSG_SPACE(sizeof(int));

	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;
	}

	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg == NULL) {
		error_f("no message header");
		return -1;
	}

	if (cmsg->cmsg_type != SCM_RIGHTS) {
		error_f("expected %d got %d", SCM_RIGHTS, cmsg->cmsg_type);
		return -1;
	}
	fd = (*(int *)CMSG_DATA(cmsg));
	return fd;
}