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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/tcpdump/print-dvmrp.c	Lines:	0	145	0.0 %
Date:	2017-11-13	Branches:	0	90	0.0 %


/*	$OpenBSD: print-dvmrp.c,v 1.9 2015/11/16 00:16:39 mmcc Exp $	*/

/*
 * Copyright (c) 1995, 1996
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#include "interface.h"
#include "addrtoname.h"

/*
 * DVMRP message types and flag values shamelessly stolen from
 * mrouted/dvmrp.h.
 */
#define DVMRP_PROBE		1	/* for finding neighbors */
#define DVMRP_REPORT		2	/* for reporting some or all routes */
#define DVMRP_ASK_NEIGHBORS	3	/* sent by mapper, asking for a list */
					/*
					 * of this router's neighbors
					 */
#define DVMRP_NEIGHBORS		4	/* response to such a request */
#define DVMRP_ASK_NEIGHBORS2	5	/* as above, want new format reply */
#define DVMRP_NEIGHBORS2	6
#define DVMRP_PRUNE		7	/* prune message */
#define DVMRP_GRAFT		8	/* graft message */
#define DVMRP_GRAFT_ACK		9	/* graft acknowledgement */

/*
 * 'flags' byte values in DVMRP_NEIGHBORS2 reply.
 */
#define DVMRP_NF_TUNNEL		0x01	/* neighbors reached via tunnel */
#define DVMRP_NF_SRCRT		0x02	/* tunnel uses IP source routing */
#define DVMRP_NF_DOWN		0x10	/* kernel state of interface */
#define DVMRP_NF_DISABLED	0x20	/* administratively disabled */
#define DVMRP_NF_QUERIER	0x40	/* I am the subnet's querier */

static void print_probe(const u_char *, const u_char *, u_int);
static void print_report(const u_char *, const u_char *, u_int);
static void print_neighbors(const u_char *, const u_char *, u_int);
static void print_neighbors2(const u_char *, const u_char *, u_int);
static void print_prune(const u_char *, const u_char *, u_int);
static void print_graft(const u_char *, const u_char *, u_int);
static void print_graft_ack(const u_char *, const u_char *, u_int);

static u_int32_t target_level;

void
dvmrp_print(const u_char *bp, u_int len)
{
	const u_char *ep;
	u_char type;

	ep = (const u_char *)snapend;
	if (bp >= ep)
		return;

	type = bp[1];
	bp += 8;
	/*
	 * Skip IGMP header
	 */

	len -= 8;

	switch (type) {

	case DVMRP_PROBE:
		printf(" Probe");
		if (vflag)
			print_probe(bp, ep, len);
		break;

	case DVMRP_REPORT:
		printf(" Report");
		if (vflag)
			print_report(bp, ep, len);
		break;

	case DVMRP_ASK_NEIGHBORS:
		printf(" Ask-neighbors(old)");
		break;

	case DVMRP_NEIGHBORS:
		printf(" Neighbors(old)");
		print_neighbors(bp, ep, len);
		break;

	case DVMRP_ASK_NEIGHBORS2:
		printf(" Ask-neighbors2");
		break;

	case DVMRP_NEIGHBORS2:
		printf(" Neighbors2");
		/*
		 * extract version and capabilities from IGMP group
		 * address field
		 */
		bp -= 4;
		target_level = (bp[0] << 24) | (bp[1] << 16) |
		    (bp[2] << 8) | bp[3];
		bp += 4;
		print_neighbors2(bp, ep, len);
		break;

	case DVMRP_PRUNE:
		printf(" Prune");
		print_prune(bp, ep, len);
		break;

	case DVMRP_GRAFT:
		printf(" Graft");
		print_graft(bp, ep, len);
		break;

	case DVMRP_GRAFT_ACK:
		printf(" Graft-ACK");
		print_graft_ack(bp, ep, len);
		break;

	default:
		printf(" [type %d]", type);
		break;
	}
}

static void
print_report(const u_char *bp, const u_char *ep, u_int len)
{
	u_int32_t mask, origin;
	int metric, i, width, done;

	while (len > 0) {
		if (len < 3) {
			printf(" [|]");
			return;
		}
		mask = (u_int32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2];
		width = 1;
		if (bp[0])
			width = 2;
		if (bp[1])
			width = 3;
		if (bp[2])
			width = 4;

		printf("\n\tMask %s", intoa(htonl(mask)));
		bp += 3;
		len -= 3;
		do {
			if (bp + width + 1 > ep) {
				printf(" [|]");
				return;
			}
			if (len < width + 1) {
				printf("\n\t  [Truncated Report]");
				return;
			}
			origin = 0;
			for (i = 0; i < width; ++i)
				origin = origin << 8 | *bp++;
			for ( ; i < 4; ++i)
				origin <<= 8;

			metric = *bp++;
			done = metric & 0x80;
			metric &= 0x7f;
			printf("\n\t  %s metric %d", intoa(htonl(origin)),
				metric);
			len -= width + 1;
		} while (!done);
	}
}

#define GET_ADDR(to) (memcpy((char *)to, (char *)bp, 4), bp += 4)

static void
print_probe(const u_char *bp, const u_char *ep, u_int len)
{
	u_int32_t genid;
	u_char neighbor[4];

	if ((len < 4) || ((bp + 4) > ep)) {
		/* { (ctags) */
		printf(" [|}");
		return;
	}
	genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3];
	bp += 4;
	len -= 4;
	printf("\n\tgenid %u", genid);

	while ((len > 0) && (bp < ep)) {
		if ((len < 4) || ((bp + 4) > ep)) {
			printf(" [|]");
			return;
		}
		GET_ADDR(neighbor);
		len -= 4;
		printf("\n\tneighbor %s", ipaddr_string(neighbor));
	}
}

static void
print_neighbors(const u_char *bp, const u_char *ep, u_int len)
{
	u_char laddr[4], neighbor[4];
	u_char metric;
	u_char thresh;
	int ncount;

	while (len > 0 && bp < ep) {
		if (len < 7 || (bp + 7) >= ep) {
			printf(" [|]");
			return;
		}
		GET_ADDR(laddr);
		metric = *bp++;
		thresh = *bp++;
		ncount = *bp++;
		len -= 7;
		while (--ncount >= 0 && (len >= 4) && (bp + 4) < ep) {
			GET_ADDR(neighbor);
			printf(" [%s ->", ipaddr_string(laddr));
			printf(" %s, (%d/%d)]",
				   ipaddr_string(neighbor), metric, thresh);
			len -= 4;
		}
	}
}

static void
print_neighbors2(const u_char *bp, const u_char *ep, u_int len)
{
	u_char laddr[4], neighbor[4];
	u_char metric, thresh, flags;
	int ncount;

	printf(" (v %d.%d):",
	       (int)target_level & 0xff,
	       (int)(target_level >> 8) & 0xff);

	while (len > 0 && bp < ep) {
		if (len < 8 || (bp + 8) >= ep) {
			printf(" [|]");
			return;
		}
		GET_ADDR(laddr);
		metric = *bp++;
		thresh = *bp++;
		flags = *bp++;
		ncount = *bp++;
		len -= 8;
		while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
			GET_ADDR(neighbor);
			printf(" [%s -> ", ipaddr_string(laddr));
			printf("%s (%d/%d", ipaddr_string(neighbor),
				     metric, thresh);
			if (flags & DVMRP_NF_TUNNEL)
				printf("/tunnel");
			if (flags & DVMRP_NF_SRCRT)
				printf("/srcrt");
			if (flags & DVMRP_NF_QUERIER)
				printf("/querier");
			if (flags & DVMRP_NF_DISABLED)
				printf("/disabled");
			if (flags & DVMRP_NF_DOWN)
				printf("/down");
			printf(")]");
			len -= 4;
		}
		if (ncount != -1) {
			printf(" [|]");
			return;
		}
	}
}

static void
print_prune(const u_char *bp, const u_char *ep, u_int len)
{
	union a {
		u_char b[4];
		u_int32_t i;
	} prune_timer;

	if (len < 12 || (bp + 12) > ep) {
		printf(" [|]");
		return;
	}
	printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
	bp += 8;
	GET_ADDR(prune_timer.b);
	printf(" timer %d", (int)ntohl(prune_timer.i));
}

static void
print_graft(const u_char *bp, const u_char *ep, u_int len)
{

	if (len < 8 || (bp + 8) > ep) {
		printf(" [|]");
		return;
	}
	printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
}

static void
print_graft_ack(const u_char *bp, const u_char *ep, u_int len)
{

	if (len < 8 || (bp + 8) > ep) {
		printf(" [|]");
		return;
	}
	printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: print-dvmrp.c,v 1.9 2015/11/16 00:16:39 mmcc Exp $ */
2
3			/*
4			* Copyright (c) 1995, 1996
5			* The Regents of the University of California. All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that: (1) source code distributions
9			* retain the above copyright notice and this paragraph in its entirety, (2)
10			* distributions including binary code include the above copyright notice and
11			* this paragraph in its entirety in the documentation or other materials
12			* provided with the distribution, and (3) all advertising materials mentioning
13			* features or use of this software display the following acknowledgement:
14			* ``This product includes software developed by the University of California,
15			* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16			* the University nor the names of its contributors may be used to endorse
17			* or promote products derived from this software without specific prior
18			* written permission.
19			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20			* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21			* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22			*/
23
24			#include <sys/time.h>
25			#include <sys/socket.h>
26
27			#include <netinet/in.h>
28			#include <netinet/ip.h>
29			#include <netinet/ip_var.h>
30			#include <netinet/udp.h>
31			#include <netinet/udp_var.h>
32			#include <netinet/tcp.h>
33
34			#include <stdio.h>
35			#include <string.h>
36			#include <stdlib.h>
37			#include <unistd.h>
38
39			#include "interface.h"
40			#include "addrtoname.h"
41
42			/*
43			* DVMRP message types and flag values shamelessly stolen from
44			* mrouted/dvmrp.h.
45			*/
46			#define DVMRP_PROBE 1 /* for finding neighbors */
47			#define DVMRP_REPORT 2 /* for reporting some or all routes */
48			#define DVMRP_ASK_NEIGHBORS 3 /* sent by mapper, asking for a list */
49			/*
50			* of this router's neighbors
51			*/
52			#define DVMRP_NEIGHBORS 4 /* response to such a request */
53			#define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */
54			#define DVMRP_NEIGHBORS2 6
55			#define DVMRP_PRUNE 7 /* prune message */
56			#define DVMRP_GRAFT 8 /* graft message */
57			#define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */
58
59			/*
60			* 'flags' byte values in DVMRP_NEIGHBORS2 reply.
61			*/
62			#define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */
63			#define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */
64			#define DVMRP_NF_DOWN 0x10 /* kernel state of interface */
65			#define DVMRP_NF_DISABLED 0x20 /* administratively disabled */
66			#define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */
67
68			static void print_probe(const u_char , const u_char , u_int);
69			static void print_report(const u_char , const u_char , u_int);
70			static void print_neighbors(const u_char , const u_char , u_int);
71			static void print_neighbors2(const u_char , const u_char , u_int);
72			static void print_prune(const u_char , const u_char , u_int);
73			static void print_graft(const u_char , const u_char , u_int);
74			static void print_graft_ack(const u_char , const u_char , u_int);
75
76			static u_int32_t target_level;
77
78			void
79			dvmrp_print(const u_char *bp, u_int len)
80			{
81			const u_char *ep;
82			u_char type;
83
84			ep = (const u_char *)snapend;
85			if (bp >= ep)
86			return;
87
88			type = bp[1];
89			bp += 8;
90			/*
91			* Skip IGMP header
92			*/
93
94			len -= 8;
95
96			switch (type) {
97
98			case DVMRP_PROBE:
99			printf(" Probe");
100			if (vflag)
101			print_probe(bp, ep, len);
102			break;
103
104			case DVMRP_REPORT:
105			printf(" Report");
106			if (vflag)
107			print_report(bp, ep, len);
108			break;
109
110			case DVMRP_ASK_NEIGHBORS:
111			printf(" Ask-neighbors(old)");
112			break;
113
114			case DVMRP_NEIGHBORS:
115			printf(" Neighbors(old)");
116			print_neighbors(bp, ep, len);
117			break;
118
119			case DVMRP_ASK_NEIGHBORS2:
120			printf(" Ask-neighbors2");
121			break;
122
123			case DVMRP_NEIGHBORS2:
124			printf(" Neighbors2");
125			/*
126			* extract version and capabilities from IGMP group
127			* address field
128			*/
129			bp -= 4;
130			target_level = (bp[0] << 24) \| (bp[1] << 16) \|
131			(bp[2] << 8) \| bp[3];
132			bp += 4;
133			print_neighbors2(bp, ep, len);
134			break;
135
136			case DVMRP_PRUNE:
137			printf(" Prune");
138			print_prune(bp, ep, len);
139			break;
140
141			case DVMRP_GRAFT:
142			printf(" Graft");
143			print_graft(bp, ep, len);
144			break;
145
146			case DVMRP_GRAFT_ACK:
147			printf(" Graft-ACK");
148			print_graft_ack(bp, ep, len);
149			break;
150
151			default:
152			printf(" [type %d]", type);
153			break;
154			}
155			}
156
157			static void
158			print_report(const u_char bp, const u_char ep, u_int len)
159			{
160			u_int32_t mask, origin;
161			int metric, i, width, done;
162
163			while (len > 0) {
164			if (len < 3) {
165			printf(" [\|]");
166			return;
167			}
168			mask = (u_int32_t)0xff << 24 \| bp[0] << 16 \| bp[1] << 8 \| bp[2];
169			width = 1;
170			if (bp[0])
171			width = 2;
172			if (bp[1])
173			width = 3;
174			if (bp[2])
175			width = 4;
176
177			printf("\n\tMask %s", intoa(htonl(mask)));
178			bp += 3;
179			len -= 3;
180			do {
181			if (bp + width + 1 > ep) {
182			printf(" [\|]");
183			return;
184			}
185			if (len < width + 1) {
186			printf("\n\t [Truncated Report]");
187			return;
188			}
189			origin = 0;
190			for (i = 0; i < width; ++i)
191			origin = origin << 8 \| *bp++;
192			for ( ; i < 4; ++i)
193			origin <<= 8;
194
195			metric = *bp++;
196			done = metric & 0x80;
197			metric &= 0x7f;
198			printf("\n\t %s metric %d", intoa(htonl(origin)),
199			metric);
200			len -= width + 1;
201			} while (!done);
202			}
203			}
204
205			#define GET_ADDR(to) (memcpy((char )to, (char )bp, 4), bp += 4)
206
207			static void
208			print_probe(const u_char bp, const u_char ep, u_int len)
209			{
210			u_int32_t genid;
211			u_char neighbor[4];
212
213			if ((len < 4) \|\| ((bp + 4) > ep)) {
214			/* { (ctags) */
215			printf(" [\|}");
216			return;
217			}
218			genid = (bp[0] << 24) \| (bp[1] << 16) \| (bp[2] << 8) \| bp[3];
219			bp += 4;
220			len -= 4;
221			printf("\n\tgenid %u", genid);
222
223			while ((len > 0) && (bp < ep)) {
224			if ((len < 4) \|\| ((bp + 4) > ep)) {
225			printf(" [\|]");
226			return;
227			}
228			GET_ADDR(neighbor);
229			len -= 4;
230			printf("\n\tneighbor %s", ipaddr_string(neighbor));
231			}
232			}
233
234			static void
235			print_neighbors(const u_char bp, const u_char ep, u_int len)
236			{
237			u_char laddr[4], neighbor[4];
238			u_char metric;
239			u_char thresh;
240			int ncount;
241
242			while (len > 0 && bp < ep) {
243			if (len < 7 \|\| (bp + 7) >= ep) {
244			printf(" [\|]");
245			return;
246			}
247			GET_ADDR(laddr);
248			metric = *bp++;
249			thresh = *bp++;
250			ncount = *bp++;
251			len -= 7;
252			while (--ncount >= 0 && (len >= 4) && (bp + 4) < ep) {
253			GET_ADDR(neighbor);
254			printf(" [%s ->", ipaddr_string(laddr));
255			printf(" %s, (%d/%d)]",
256			ipaddr_string(neighbor), metric, thresh);
257			len -= 4;
258			}
259			}
260			}
261
262			static void
263			print_neighbors2(const u_char bp, const u_char ep, u_int len)
264			{
265			u_char laddr[4], neighbor[4];
266			u_char metric, thresh, flags;
267			int ncount;
268
269			printf(" (v %d.%d):",
270			(int)target_level & 0xff,
271			(int)(target_level >> 8) & 0xff);
272
273			while (len > 0 && bp < ep) {
274			if (len < 8 \|\| (bp + 8) >= ep) {
275			printf(" [\|]");
276			return;
277			}
278			GET_ADDR(laddr);
279			metric = *bp++;
280			thresh = *bp++;
281			flags = *bp++;
282			ncount = *bp++;
283			len -= 8;
284			while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
285			GET_ADDR(neighbor);
286			printf(" [%s -> ", ipaddr_string(laddr));
287			printf("%s (%d/%d", ipaddr_string(neighbor),
288			metric, thresh);
289			if (flags & DVMRP_NF_TUNNEL)
290			printf("/tunnel");
291			if (flags & DVMRP_NF_SRCRT)
292			printf("/srcrt");
293			if (flags & DVMRP_NF_QUERIER)
294			printf("/querier");
295			if (flags & DVMRP_NF_DISABLED)
296			printf("/disabled");
297			if (flags & DVMRP_NF_DOWN)
298			printf("/down");
299			printf(")]");
300			len -= 4;
301			}
302			if (ncount != -1) {
303			printf(" [\|]");
304			return;
305			}
306			}
307			}
308
309			static void
310			print_prune(const u_char bp, const u_char ep, u_int len)
311			{
312			union a {
313			u_char b[4];
314			u_int32_t i;
315			} prune_timer;
316
317			if (len < 12 \|\| (bp + 12) > ep) {
318			printf(" [\|]");
319			return;
320			}
321			printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
322			bp += 8;
323			GET_ADDR(prune_timer.b);
324			printf(" timer %d", (int)ntohl(prune_timer.i));
325			}
326
327			static void
328			print_graft(const u_char bp, const u_char ep, u_int len)
329			{
330
331			if (len < 8 \|\| (bp + 8) > ep) {
332			printf(" [\|]");
333			return;
334			}
335			printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
336			}
337
338			static void
339			print_graft_ack(const u_char bp, const u_char ep, u_int len)
340			{
341
342			if (len < 8 \|\| (bp + 8) > ep) {
343			printf(" [\|]");
344			return;
345			}
346			printf(" src %s grp %s", ipaddr_string(bp), ipaddr_string(bp + 4));
347			}