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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/mopd/moptrace/../common/pf.c	Lines:	0	79	0.0 %
Date:	2017-11-07	Branches:	0	32	0.0 %


/*	$OpenBSD: pf.c,v 1.17 2017/04/19 05:36:13 natano Exp $ */

/*
 * Copyright (c) 1993-95 Mats O Jansson.  All rights reserved.
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is partly derived from rarpd.
 *
 * 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 <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <net/if.h>

#include <net/bpf.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <netdb.h>
#include <ctype.h>
#include <string.h>
#include <err.h>
#include <errno.h>

#include <syslog.h>

#include "common/mopdef.h"

/*
 * Variables
 */

extern int promisc;

/*
 * Return information to device.c how to open device.
 * In this case the driver can handle both Ethernet type II and
 * IEEE 802.3 frames (SNAP) in a single pfOpen.
 */
/* ARGSUSED */
int
pfTrans(char *interface)
{
	return (TRANS_ETHER + TRANS_8023 + TRANS_AND);
}

/*
 * Open and initialize packet filter.
 */
/* ARGSUSED */
int
pfInit(char *interface, int mode, u_short protocol, int typ)
{
	int		fd;
	struct ifreq	ifr;
	u_int		dlt;
	int		immediate;

	static struct bpf_insn insns[] = {
		BPF_STMT(BPF_LD | BPF_H | BPF_ABS, 12),
		BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x4711, 4, 0),
		BPF_STMT(BPF_LD | BPF_H | BPF_ABS, 20),
		BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x4711, 0, 3),
		BPF_STMT(BPF_LD | BPF_H | BPF_ABS, 14),
		BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0xaaaa, 0, 1),
		BPF_STMT(BPF_RET | BPF_K, 1520),
		BPF_STMT(BPF_RET | BPF_K, 0),
	};
	static struct bpf_program filter = {
		sizeof insns / sizeof(insns[0]),
		insns
	};

	if ((fd = open("/dev/bpf", mode)) == -1) {
		syslog(LOG_ERR,"pfInit: open bpf %m");
		return (-1);
	}

	/* Set immediate mode so packets are processed as they arrive. */
	immediate = 1;
	if (ioctl(fd, BIOCIMMEDIATE, &immediate) < 0) {
		syslog(LOG_ERR,"pfInit: BIOCIMMEDIATE: %m");
		return (-1);
	}
	strncpy(ifr.ifr_name, interface, sizeof ifr.ifr_name);
	if (ioctl(fd, BIOCSETIF, &ifr) < 0) {
		syslog(LOG_ERR,"pfInit: BIOCSETIF: %m");
		return (-1);
	}
	/* Check that the data link layer is an Ethernet; this code won't work
	 * with anything else. */
	if (ioctl(fd, BIOCGDLT, &dlt) < 0) {
		syslog(LOG_ERR,"pfInit: BIOCGDLT: %m");
		return (-1);
	}
	if (dlt != DLT_EN10MB) {
		syslog(LOG_ERR,"pfInit: %s is not ethernet", interface);
		return (-1);
	}
	if (promisc)
		/* Set promiscuous mode. */
		if (ioctl(fd, BIOCPROMISC, 0) < 0) {
			syslog(LOG_ERR,"pfInit: BIOCPROMISC: %m");
			return (-1);
		}

	/* Set filter program. */
	insns[1].k = protocol;
	insns[3].k = protocol;

	if (ioctl(fd, BIOCSETF, &filter) < 0) {
		syslog(LOG_ERR,"pfInit: BIOCSETF: %m");
		return (-1);
	}

	/* XXX set the same write filter (for protocol only) */
	if (ioctl(fd, BIOCSETWF, &filter) < 0) {
		syslog(LOG_ERR,"pfInit: BIOCSETWF: %m");
		return (-1);
	}

	/* Lock the interface to prevent further changes */
	if (ioctl(fd, BIOCLOCK) < 0) {
		syslog(LOG_ERR,"pfInit: BIOCLOCK: %m");
		return (-1);
	}

	return (fd);
}

/*
 * Add a Multicast address to the interface
 */
/* ARGSUSED */
int
pfAddMulti(int s, char *interface, char *addr)
{
	struct ifreq	ifr;
	int		fd;

	strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name) - 1);
	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = 0;

	ifr.ifr_addr.sa_family = AF_UNSPEC;
	bcopy(addr, ifr.ifr_addr.sa_data, 6);

	/*
	 * open a socket, temporarily, to use for SIOC* ioctls
	 */
	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		syslog(LOG_ERR, "pfAddMulti: socket: %m");
		return (-1);
	}
	if (ioctl(fd, SIOCADDMULTI, &ifr) < 0) {
		syslog(LOG_ERR, "pfAddMulti: SIOCADDMULTI: %m");
		close(fd);
		return (-1);
	}
	close(fd);

	return (0);
}

/*
 * Delete a Multicast address from the interface
 */
/* ARGSUSED */
int
pfDelMulti(int s, char *interface, char *addr)
{
	struct ifreq	ifr;
	int		fd;

	strncpy(ifr.ifr_name, interface, sizeof (ifr.ifr_name) - 1);
	ifr.ifr_name[sizeof(ifr.ifr_name)-1] = 0;

	ifr.ifr_addr.sa_family = AF_UNSPEC;
	bcopy(addr, ifr.ifr_addr.sa_data, 6);

	/*
	 * open a socket, temporarily, to use for SIOC* ioctls
	 *
	 */
	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		syslog(LOG_ERR, "pfDelMulti: socket: %m");
		return (-1);
	}
	if (ioctl(fd, SIOCDELMULTI, &ifr) < 0) {
		syslog(LOG_ERR, "pfAddMulti: SIOCDELMULTI: %m");
		close(fd);
		return (-1);
	}
	close(fd);

	return (0);
}

/*
 * read a packet
 */
int
pfRead(int fd, u_char *buf, int len)
{
	return (read(fd, buf, len));
}

/*
 * write a packet
 */
int
pfWrite(int fd, u_char *buf, int len, int trans)
{
	struct iovec	iov[2];

	/* XXX */
	switch (trans) {
	case TRANS_8023:
		iov[0].iov_base = buf;
		iov[0].iov_len = 22;
		iov[1].iov_base = buf + 22;
		iov[1].iov_len = len - 22;
		break;
	default:
		iov[0].iov_base = buf;
		iov[0].iov_len = 14;
		iov[1].iov_base = buf + 14;
		iov[1].iov_len = len - 14;
		break;
	}

	if (writev(fd, iov, 2) == len)
		return (len);

	return (-1);
}



Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: pf.c,v 1.17 2017/04/19 05:36:13 natano Exp $ */
2
3			/*
4			* Copyright (c) 1993-95 Mats O Jansson. All rights reserved.
5			* Copyright (c) 1990 The Regents of the University of California.
6			* All rights reserved.
7			*
8			* This code is partly derived from rarpd.
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			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29			*/
30
31			#include <stdio.h>
32			#include <unistd.h>
33			#include <sys/types.h>
34			#include <sys/time.h>
35			#include <sys/ioctl.h>
36			#include <sys/file.h>
37			#include <sys/socket.h>
38			#include <sys/uio.h>
39			#include <net/if.h>
40
41			#include <net/bpf.h>
42
43			#include <netinet/in.h>
44			#include <netinet/if_ether.h>
45
46			#include <netdb.h>
47			#include <ctype.h>
48			#include <string.h>
49			#include <err.h>
50			#include <errno.h>
51
52			#include <syslog.h>
53
54			#include "common/mopdef.h"
55
56			/*
57			* Variables
58			*/
59
60			extern int promisc;
61
62			/*
63			* Return information to device.c how to open device.
64			* In this case the driver can handle both Ethernet type II and
65			* IEEE 802.3 frames (SNAP) in a single pfOpen.
66			*/
67			/* ARGSUSED */
68			int
69			pfTrans(char *interface)
70			{
71			return (TRANS_ETHER + TRANS_8023 + TRANS_AND);
72			}
73
74			/*
75			* Open and initialize packet filter.
76			*/
77			/* ARGSUSED */
78			int
79			pfInit(char *interface, int mode, u_short protocol, int typ)
80			{
81			int fd;
82			struct ifreq ifr;
83			u_int dlt;
84			int immediate;
85
86			static struct bpf_insn insns[] = {
87			BPF_STMT(BPF_LD \| BPF_H \| BPF_ABS, 12),
88			BPF_JUMP(BPF_JMP \| BPF_JEQ \| BPF_K, 0x4711, 4, 0),
89			BPF_STMT(BPF_LD \| BPF_H \| BPF_ABS, 20),
90			BPF_JUMP(BPF_JMP \| BPF_JEQ \| BPF_K, 0x4711, 0, 3),
91			BPF_STMT(BPF_LD \| BPF_H \| BPF_ABS, 14),
92			BPF_JUMP(BPF_JMP \| BPF_JEQ \| BPF_K, 0xaaaa, 0, 1),
93			BPF_STMT(BPF_RET \| BPF_K, 1520),
94			BPF_STMT(BPF_RET \| BPF_K, 0),
95			};
96			static struct bpf_program filter = {
97			sizeof insns / sizeof(insns[0]),
98			insns
99			};
100
101			if ((fd = open("/dev/bpf", mode)) == -1) {
102			syslog(LOG_ERR,"pfInit: open bpf %m");
103			return (-1);
104			}
105
106			/* Set immediate mode so packets are processed as they arrive. */
107			immediate = 1;
108			if (ioctl(fd, BIOCIMMEDIATE, &immediate) < 0) {
109			syslog(LOG_ERR,"pfInit: BIOCIMMEDIATE: %m");
110			return (-1);
111			}
112			strncpy(ifr.ifr_name, interface, sizeof ifr.ifr_name);
113			if (ioctl(fd, BIOCSETIF, &ifr) < 0) {
114			syslog(LOG_ERR,"pfInit: BIOCSETIF: %m");
115			return (-1);
116			}
117			/* Check that the data link layer is an Ethernet; this code won't work
118			* with anything else. */
119			if (ioctl(fd, BIOCGDLT, &dlt) < 0) {
120			syslog(LOG_ERR,"pfInit: BIOCGDLT: %m");
121			return (-1);
122			}
123			if (dlt != DLT_EN10MB) {
124			syslog(LOG_ERR,"pfInit: %s is not ethernet", interface);
125			return (-1);
126			}
127			if (promisc)
128			/* Set promiscuous mode. */
129			if (ioctl(fd, BIOCPROMISC, 0) < 0) {
130			syslog(LOG_ERR,"pfInit: BIOCPROMISC: %m");
131			return (-1);
132			}
133
134			/* Set filter program. */
135			insns[1].k = protocol;
136			insns[3].k = protocol;
137
138			if (ioctl(fd, BIOCSETF, &filter) < 0) {
139			syslog(LOG_ERR,"pfInit: BIOCSETF: %m");
140			return (-1);
141			}
142
143			/* XXX set the same write filter (for protocol only) */
144			if (ioctl(fd, BIOCSETWF, &filter) < 0) {
145			syslog(LOG_ERR,"pfInit: BIOCSETWF: %m");
146			return (-1);
147			}
148
149			/* Lock the interface to prevent further changes */
150			if (ioctl(fd, BIOCLOCK) < 0) {
151			syslog(LOG_ERR,"pfInit: BIOCLOCK: %m");
152			return (-1);
153			}
154
155			return (fd);
156			}
157
158			/*
159			* Add a Multicast address to the interface
160			*/
161			/* ARGSUSED */
162			int
163			pfAddMulti(int s, char interface, char addr)
164			{
165			struct ifreq ifr;
166			int fd;
167
168			strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name) - 1);
169			ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = 0;
170
171			ifr.ifr_addr.sa_family = AF_UNSPEC;
172			bcopy(addr, ifr.ifr_addr.sa_data, 6);
173
174			/*
175			* open a socket, temporarily, to use for SIOC* ioctls
176			*/
177			if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
178			syslog(LOG_ERR, "pfAddMulti: socket: %m");
179			return (-1);
180			}
181			if (ioctl(fd, SIOCADDMULTI, &ifr) < 0) {
182			syslog(LOG_ERR, "pfAddMulti: SIOCADDMULTI: %m");
183			close(fd);
184			return (-1);
185			}
186			close(fd);
187
188			return (0);
189			}
190
191			/*
192			* Delete a Multicast address from the interface
193			*/
194			/* ARGSUSED */
195			int
196			pfDelMulti(int s, char interface, char addr)
197			{
198			struct ifreq ifr;
199			int fd;
200
201			strncpy(ifr.ifr_name, interface, sizeof (ifr.ifr_name) - 1);
202			ifr.ifr_name[sizeof(ifr.ifr_name)-1] = 0;
203
204			ifr.ifr_addr.sa_family = AF_UNSPEC;
205			bcopy(addr, ifr.ifr_addr.sa_data, 6);
206
207			/*
208			* open a socket, temporarily, to use for SIOC* ioctls
209			*
210			*/
211			if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
212			syslog(LOG_ERR, "pfDelMulti: socket: %m");
213			return (-1);
214			}
215			if (ioctl(fd, SIOCDELMULTI, &ifr) < 0) {
216			syslog(LOG_ERR, "pfAddMulti: SIOCDELMULTI: %m");
217			close(fd);
218			return (-1);
219			}
220			close(fd);
221
222			return (0);
223			}
224
225			/*
226			* read a packet
227			*/
228			int
229			pfRead(int fd, u_char *buf, int len)
230			{
231			return (read(fd, buf, len));
232			}
233
234			/*
235			* write a packet
236			*/
237			int
238			pfWrite(int fd, u_char *buf, int len, int trans)
239			{
240			struct iovec iov[2];
241
242			/* XXX */
243			switch (trans) {
244			case TRANS_8023:
245			iov[0].iov_base = buf;
246			iov[0].iov_len = 22;
247			iov[1].iov_base = buf + 22;
248			iov[1].iov_len = len - 22;
249			break;
250			default:
251			iov[0].iov_base = buf;
252			iov[0].iov_len = 14;
253			iov[1].iov_base = buf + 14;
254			iov[1].iov_len = len - 14;
255			break;
256			}
257
258			if (writev(fd, iov, 2) == len)
259			return (len);
260
261			return (-1);
262			}
263