GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/pflogd/privsep_fdpass.c Lines: 0 50 0.0 %
Date: 2017-11-07 Branches: 0 16 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: privsep_fdpass.c,v 1.8 2014/11/18 20:51:00 krw Exp $	*/
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/*
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 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
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 * All rights reserved.
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 *
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 * Copyright (c) 2002 Matthieu Herrb
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *    - Redistributions of source code must retain the above copyright
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 *      notice, this list of conditions and the following disclaimer.
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 *    - Redistributions in binary form must reproduce the above
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 *      copyright notice, this list of conditions and the following
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 *      disclaimer in the documentation and/or other materials provided
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 *      with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "pflogd.h"
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void
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send_fd(int sock, int fd)
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{
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	struct msghdr msg;
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	union {
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		struct cmsghdr hdr;
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		char buf[CMSG_SPACE(sizeof(int))];
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	} cmsgbuf;
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	struct cmsghdr *cmsg;
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	struct iovec vec;
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	int result = 0;
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	ssize_t n;
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	memset(&msg, 0, sizeof(msg));
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	if (fd >= 0) {
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		msg.msg_control = (caddr_t)&cmsgbuf.buf;
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		msg.msg_controllen = sizeof(cmsgbuf.buf);
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		cmsg = CMSG_FIRSTHDR(&msg);
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		cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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		cmsg->cmsg_level = SOL_SOCKET;
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		cmsg->cmsg_type = SCM_RIGHTS;
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		*(int *)CMSG_DATA(cmsg) = fd;
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	} else {
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		result = errno;
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	}
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	vec.iov_base = &result;
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	vec.iov_len = sizeof(int);
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	msg.msg_iov = &vec;
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	msg.msg_iovlen = 1;
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	if ((n = sendmsg(sock, &msg, 0)) == -1)
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		warn("%s: sendmsg(%d)", __func__, sock);
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	if (n != sizeof(int))
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		warnx("%s: sendmsg: expected sent 1 got %ld",
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		    __func__, (long)n);
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}
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int
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receive_fd(int sock)
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{
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	struct msghdr msg;
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	union {
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		struct cmsghdr hdr;
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		char buf[CMSG_SPACE(sizeof(int))];
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	} cmsgbuf;
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	struct cmsghdr *cmsg;
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	struct iovec vec;
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	ssize_t n;
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	int result;
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	int fd;
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	memset(&msg, 0, sizeof(msg));
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	vec.iov_base = &result;
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	vec.iov_len = sizeof(int);
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	msg.msg_iov = &vec;
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	msg.msg_iovlen = 1;
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	msg.msg_control = &cmsgbuf.buf;
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	msg.msg_controllen = sizeof(cmsgbuf.buf);
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	if ((n = recvmsg(sock, &msg, 0)) == -1) {
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		warn("%s: recvmsg", __func__);
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		return -1;
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	}
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	if (n != sizeof(int))
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		warnx("%s: recvmsg: expected received 1 got %ld",
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		    __func__, (long)n);
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	if (result == 0) {
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		cmsg = CMSG_FIRSTHDR(&msg);
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		if (cmsg == NULL) {
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			warnx("%s: no message header", __func__);
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			return -1;
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		}
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		if (cmsg->cmsg_type != SCM_RIGHTS)
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			warnx("%s: expected type %d got %d", __func__,
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			    SCM_RIGHTS, cmsg->cmsg_type);
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		fd = (*(int *)CMSG_DATA(cmsg));
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		return fd;
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	} else {
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		errno = result;
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		return -1;
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	}
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}