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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/syslogd/privsep_fdpass.c	Lines:	22	53	41.5 %
Date:	2017-11-13	Branches:	4	18	22.2 %


/*	$OpenBSD: privsep_fdpass.c,v 1.11 2015/07/09 20:16:04 bluhm Exp $	*/

/*
 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Copyright (c) 2002 Matthieu Herrb
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
 * COPYRIGHT HOLDERS OR CONTRIBUTORS 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 <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "syslogd.h"

void
send_fd(int sock, int fd)
{
	struct msghdr msg;
	union {
		struct cmsghdr hdr;
		char buf[CMSG_SPACE(sizeof(int))];
	} cmsgbuf;
	struct cmsghdr *cmsg;
	struct iovec vec;
	int result = 0;
	ssize_t n;

	memset(&msg, 0, sizeof(msg));

	if (fd >= 0) {
		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;
	} else {
		result = errno;
	}

	vec.iov_base = &result;
	vec.iov_len = sizeof(int);
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;

	if ((n = sendmsg(sock, &msg, 0)) == -1)
		warn("%s: sendmsg(%d)", "send_fd", sock);
	if (n != sizeof(int))
		warnx("%s: sendmsg: expected sent 1 got %ld",
		    "send_fd", (long)n);
}

int
receive_fd(int sock)
{
	struct msghdr msg;
	union {
		struct cmsghdr hdr;
		char buf[CMSG_SPACE(sizeof(int))];
	} cmsgbuf;
	struct cmsghdr *cmsg;
	struct iovec vec;
	ssize_t n;
	int result;
	int fd;

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

	if ((n = recvmsg(sock, &msg, 0)) == -1) {
		warn("%s: recvmsg", "receive_fd");
		/* receive message failed, but the result is in the socket */
		if (errno == EMSGSIZE)
			recv(sock, &result, sizeof(int), MSG_DONTWAIT);
		return -1;
	}
	if (n != sizeof(int))
		warnx("%s: recvmsg: expected received 1 got %ld",
		    "receive_fd", (long)n);
	if (result == 0) {
		cmsg = CMSG_FIRSTHDR(&msg);
		if (cmsg == NULL) {
			warnx("%s: no message header", "receive_fd");
			return (-1);
		}
		if (cmsg->cmsg_type != SCM_RIGHTS)
			warnx("%s: expected type %d got %d", "receive_fd",
			    SCM_RIGHTS, cmsg->cmsg_type);
		fd = (*(int *)CMSG_DATA(cmsg));
		return fd;
	} else {
		errno = result;
		return -1;
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: privsep_fdpass.c,v 1.11 2015/07/09 20:16:04 bluhm Exp $ */
2
3			/*
4			* Copyright 2001 Niels Provos <provos@citi.umich.edu>
5			* All rights reserved.
6			*
7			* Copyright (c) 2002 Matthieu Herrb
8			* All rights reserved.
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			*
14			* - Redistributions of source code must retain the above copyright
15			* notice, this list of conditions and the following disclaimer.
16			* - Redistributions in binary form must reproduce the above
17			* copyright notice, this list of conditions and the following
18			* disclaimer in the documentation and/or other materials provided
19			* with the distribution.
20			*
21			* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22			* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23			* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24			* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25			* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27			* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28			* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
29			* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31			* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32			* POSSIBILITY OF SUCH DAMAGE.
33			*/
34
35			#include <err.h>
36			#include <errno.h>
37			#include <stdio.h>
38			#include <stdlib.h>
39			#include <string.h>
40			#include <unistd.h>
41
42			#include "syslogd.h"
43
44			void
45			send_fd(int sock, int fd)
46			{
47		72876	struct msghdr msg;
48		36438	union {
49			struct cmsghdr hdr;
50			char buf[CMSG_SPACE(sizeof(int))];
51			} cmsgbuf;
52			struct cmsghdr *cmsg;
53		36438	struct iovec vec;
54		36438	int result = 0;
55			ssize_t n;
56
57		36438	memset(&msg, 0, sizeof(msg));
58
59	✓✓	36438	if (fd >= 0) {
60		36422	msg.msg_control = (caddr_t)&cmsgbuf.buf;
61		36422	msg.msg_controllen = sizeof(cmsgbuf.buf);
62		36422	cmsg = CMSG_FIRSTHDR(&msg);
63		36422	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
64		36422	cmsg->cmsg_level = SOL_SOCKET;
65		36422	cmsg->cmsg_type = SCM_RIGHTS;
66		36422	(int )CMSG_DATA(cmsg) = fd;
67		36422	} else {
68		16	result = errno;
69			}
70
71		36438	vec.iov_base = &result;
72		36438	vec.iov_len = sizeof(int);
73		36438	msg.msg_iov = &vec;
74		36438	msg.msg_iovlen = 1;
75
76	✗✓	36438	if ((n = sendmsg(sock, &msg, 0)) == -1)
77			warn("%s: sendmsg(%d)", "send_fd", sock);
78	✗✓	36438	if (n != sizeof(int))
79			warnx("%s: sendmsg: expected sent 1 got %ld",
80			"send_fd", (long)n);
81		36438	}
82
83			int
84			receive_fd(int sock)
85			{
86			struct msghdr msg;
87			union {
88			struct cmsghdr hdr;
89			char buf[CMSG_SPACE(sizeof(int))];
90			} cmsgbuf;
91			struct cmsghdr *cmsg;
92			struct iovec vec;
93			ssize_t n;
94			int result;
95			int fd;
96
97			memset(&msg, 0, sizeof(msg));
98			vec.iov_base = &result;
99			vec.iov_len = sizeof(int);
100			msg.msg_iov = &vec;
101			msg.msg_iovlen = 1;
102			msg.msg_control = &cmsgbuf.buf;
103			msg.msg_controllen = sizeof(cmsgbuf.buf);
104
105			if ((n = recvmsg(sock, &msg, 0)) == -1) {
106			warn("%s: recvmsg", "receive_fd");
107			/* receive message failed, but the result is in the socket */
108			if (errno == EMSGSIZE)
109			recv(sock, &result, sizeof(int), MSG_DONTWAIT);
110			return -1;
111			}
112			if (n != sizeof(int))
113			warnx("%s: recvmsg: expected received 1 got %ld",
114			"receive_fd", (long)n);
115			if (result == 0) {
116			cmsg = CMSG_FIRSTHDR(&msg);
117			if (cmsg == NULL) {
118			warnx("%s: no message header", "receive_fd");
119			return (-1);
120			}
121			if (cmsg->cmsg_type != SCM_RIGHTS)
122			warnx("%s: expected type %d got %d", "receive_fd",
123			SCM_RIGHTS, cmsg->cmsg_type);
124			fd = ((int )CMSG_DATA(cmsg));
125			return fd;
126			} else {
127			errno = result;
128			return -1;
129			}
130			}