print-rip.c revision 17680 
1/*
2 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
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
23static char rcsid[] =
24    "@(#) $Header: print-rip.c,v 1.34 96/07/23 14:17:26 leres Exp $ (LBL)";
25#endif
26
27#include <sys/param.h>
28#include <sys/time.h>
29#include <sys/socket.h>
30
31#include <netinet/in.h>
32#include <netinet/in_systm.h>
33#include <netinet/ip.h>
34#include <netinet/ip_var.h>
35#include <netinet/udp.h>
36#include <netinet/udp_var.h>
37
38#include <stdio.h>
39
40#include "interface.h"
41#include "addrtoname.h"
42#include "extract.h"			/* must come after interface.h */
43
44struct rip {
45	u_char rip_cmd;			/* request/response */
46	u_char rip_vers;		/* protocol version # */
47	u_short rip_zero2;		/* unused */
48};
49#define	RIPCMD_REQUEST		1	/* want info */
50#define	RIPCMD_RESPONSE		2	/* responding to request */
51#define	RIPCMD_TRACEON		3	/* turn tracing on */
52#define	RIPCMD_TRACEOFF		4	/* turn it off */
53#define	RIPCMD_POLL		5	/* want info from everybody */
54#define	RIPCMD_POLLENTRY	6	/* poll for entry */
55
56struct rip_netinfo {
57	u_short rip_family;
58	u_short rip_tag;
59	u_int32_t rip_dest;
60	u_int32_t rip_dest_mask;
61	u_int32_t rip_router;
62	u_int32_t rip_metric;		/* cost of route */
63};
64
65static void
66rip_entry_print(register int vers, register const struct rip_netinfo *ni)
67{
68	register u_char *cp, *ep;
69
70	if (EXTRACT_16BITS(&ni->rip_family) != AF_INET) {
71
72		printf(" [family %d:", EXTRACT_16BITS(&ni->rip_family));
73		cp = (u_char *)&ni->rip_tag;
74		ep = (u_char *)&ni->rip_metric + sizeof(ni->rip_metric);
75		for (; cp < ep; cp += 2)
76			printf(" %04x", EXTRACT_16BITS(cp));
77		printf("]");
78	} else if (vers < 2) {
79		/* RFC 1058 */
80		printf(" %s", ipaddr_string(&ni->rip_dest));
81	} else {
82		/* RFC 1723 */
83		printf(" {%s", ipaddr_string(&ni->rip_dest));
84		if (ni->rip_dest_mask)
85			printf("/%s", ipaddr_string(&ni->rip_dest_mask));
86		if (ni->rip_router)
87			printf("->%s", ipaddr_string(&ni->rip_router));
88		if (ni->rip_tag)
89			printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
90		printf("}");
91	}
92	printf("(%d)", EXTRACT_32BITS(&ni->rip_metric));
93}
94
95void
96rip_print(const u_char *dat, u_int length)
97{
98	register const struct rip *rp;
99	register const struct rip_netinfo *ni;
100	register int i, j, trunc;
101
102	i = min(length, snapend - dat) - (sizeof(*rp) - sizeof(*ni));
103	if (i < 0)
104		return;
105
106	rp = (struct rip *)dat;
107	switch (rp->rip_cmd) {
108
109	case RIPCMD_REQUEST:
110		printf(" rip-req %d", length);
111		break;
112
113	case RIPCMD_RESPONSE:
114		j = length / sizeof(*ni);
115		if (j * sizeof(*ni) != length - 4)
116			printf(" rip-resp %d[%d]:", j, length);
117		else
118			printf(" rip-resp %d:", j);
119		trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
120		ni = (struct rip_netinfo *)(rp + 1);
121		for (; (i -= sizeof(*ni)) >= 0; ++ni)
122			rip_entry_print(rp->rip_vers, ni);
123		if (trunc)
124			printf("[|rip]");
125		break;
126
127	case RIPCMD_TRACEON:
128		printf(" rip-traceon %d: \"", length);
129		(void)fn_print((const u_char *)(rp + 1), snapend);
130		fputs("\"\n", stdout);
131		break;
132
133	case RIPCMD_TRACEOFF:
134		printf(" rip-traceoff %d", length);
135		break;
136
137	case RIPCMD_POLL:
138		printf(" rip-poll %d", length);
139		break;
140
141	case RIPCMD_POLLENTRY:
142		printf(" rip-pollentry %d", length);
143		break;
144
145	default:
146		printf(" rip-#%d %d", rp->rip_cmd, length);
147		break;
148	}
149	switch (rp->rip_vers) {
150
151	case 1:
152	case 2:
153		break;
154
155	default:
156		printf(" [vers %d]", rp->rip_vers);
157		break;
158        }
159}
160