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1 /*
2  * Copyright (c) 1989, 1990, 1991, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  */
21 
22 #ifndef lint
23 static const char rcsid[] _U_ =
24     "@(#) $Header: /tcpdump/master/tcpdump/print-ripng.c,v 1.18 2005/01/04 00:15:54 guy Exp $";
25 #endif
26 
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30 
31 #ifdef INET6
32 
33 #include <tcpdump-stdinc.h>
34 #include <stdio.h>
35 
36 #include "route6d.h"
37 #include "interface.h"
38 #include "addrtoname.h"
39 #include "extract.h"
40 
41 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr * addr)42 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
43 {
44     static const struct in6_addr in6addr_any;        /* :: */
45     return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
46 }
47 #endif
48 
49 static int
rip6_entry_print(register const struct netinfo6 * ni,int metric)50 rip6_entry_print(register const struct netinfo6 *ni, int metric)
51 {
52 	int l;
53 	l = printf("%s/%d", ip6addr_string(&ni->rip6_dest), ni->rip6_plen);
54 	if (ni->rip6_tag)
55 		l += printf(" [%d]", EXTRACT_16BITS(&ni->rip6_tag));
56 	if (metric)
57 		l += printf(" (%d)", ni->rip6_metric);
58 	return l;
59 }
60 
61 void
ripng_print(const u_char * dat,unsigned int length)62 ripng_print(const u_char *dat, unsigned int length)
63 {
64 	register const struct rip6 *rp = (struct rip6 *)dat;
65 	register const struct netinfo6 *ni;
66 	register u_int amt;
67 	register u_int i;
68 	int j;
69 	int trunc;
70 
71 	if (snapend < dat)
72 		return;
73 	amt = snapend - dat;
74 	i = min(length, amt);
75 	if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
76 		return;
77 	i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
78 
79 	switch (rp->rip6_cmd) {
80 
81 	case RIP6_REQUEST:
82 		j = length / sizeof(*ni);
83 		if (j == 1
84 		    &&  rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
85 		    &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
86 			printf(" ripng-req dump");
87 			break;
88 		}
89 		if (j * sizeof(*ni) != length - 4)
90 			printf(" ripng-req %d[%u]:", j, length);
91 		else
92 			printf(" ripng-req %d:", j);
93 		trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
94 		for (ni = rp->rip6_nets; i >= sizeof(*ni);
95 		    i -= sizeof(*ni), ++ni) {
96 			if (vflag > 1)
97 				printf("\n\t");
98 			else
99 				printf(" ");
100 			rip6_entry_print(ni, 0);
101 		}
102 		break;
103 	case RIP6_RESPONSE:
104 		j = length / sizeof(*ni);
105 		if (j * sizeof(*ni) != length - 4)
106 			printf(" ripng-resp %d[%u]:", j, length);
107 		else
108 			printf(" ripng-resp %d:", j);
109 		trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
110 		for (ni = rp->rip6_nets; i >= sizeof(*ni);
111 		    i -= sizeof(*ni), ++ni) {
112 			if (vflag > 1)
113 				printf("\n\t");
114 			else
115 				printf(" ");
116 			rip6_entry_print(ni, ni->rip6_metric);
117 		}
118 		if (trunc)
119 			printf("[|ripng]");
120 		break;
121 	default:
122 		printf(" ripng-%d ?? %u", rp->rip6_cmd, length);
123 		break;
124 	}
125 	if (rp->rip6_vers != RIP6_VERSION)
126 		printf(" [vers %d]", rp->rip6_vers);
127 }
128 #endif /* INET6 */
129