print-rip.c revision 1.17 
1/*	$OpenBSD: print-rip.c,v 1.17 2018/07/06 05:47:22 dlg Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 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
33#include <stdio.h>
34#include <string.h>
35#include <ctype.h>
36
37#include "interface.h"
38#include "addrtoname.h"
39#include "extract.h"			/* must come after interface.h */
40
41struct rip {
42	u_char rip_cmd;			/* request/response */
43	u_char rip_vers;		/* protocol version # */
44	u_short rip_zero2;		/* unused */
45};
46#define	RIPCMD_REQUEST		1	/* want info */
47#define	RIPCMD_RESPONSE		2	/* responding to request */
48#define	RIPCMD_TRACEON		3	/* turn tracing on */
49#define	RIPCMD_TRACEOFF		4	/* turn it off */
50#define	RIPCMD_POLL		5	/* want info from everybody */
51#define	RIPCMD_POLLENTRY	6	/* poll for entry */
52
53#define RIP_AUTHLEN 16
54
55struct rip_netinfo {
56	u_short rip_family;
57	u_short rip_tag;
58	u_int32_t rip_dest;
59	u_int32_t rip_dest_mask;
60	u_int32_t rip_router;
61	u_int32_t rip_metric;		/* cost of route */
62};
63
64static void
65rip_printblk(const u_char *cp, const u_char *ep)
66{
67	for (; cp < ep; cp += 2)
68		printf(" %04x", EXTRACT_16BITS(cp));
69	return;
70}
71
72static void
73rip_entry_print_v1(int vers, const struct rip_netinfo *ni)
74{
75	u_short family;
76
77	/* RFC 1058 */
78	family = EXTRACT_16BITS(&ni->rip_family);
79	if (family != AF_INET) {
80		printf(" [family %d:", family);
81		rip_printblk((u_char *)&ni->rip_tag,
82			     (u_char *)&ni->rip_metric +
83			     sizeof(ni->rip_metric));
84		printf("]");
85		return;
86	}
87	if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
88		/* MBZ fields not zero */
89		printf(" [");
90		rip_printblk((u_char *)&ni->rip_family,
91			     (u_char *)&ni->rip_metric +
92			     sizeof(ni->rip_metric));
93		printf("]");
94		return;
95	}
96	printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
97	       EXTRACT_32BITS(&ni->rip_metric));
98}
99
100static void
101rip_entry_print_v2(int vers, const struct rip_netinfo *ni)
102{
103	u_char *p;
104	u_short family;
105	char buf[RIP_AUTHLEN];
106
107	/* RFC 1723 */
108	family = EXTRACT_16BITS(&ni->rip_family);
109	if (family == 0xFFFF) {
110		if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
111			memcpy(buf, &ni->rip_dest, sizeof(buf));
112			buf[sizeof(buf)-1] = '\0';
113			for (p = buf; *p; p++) {
114				if (!isprint(*p))
115					break;
116			}
117			if (!*p) {
118				printf(" [password %s]", buf);
119			} else {
120				printf(" [password: ");
121				rip_printblk((u_char *)&ni->rip_dest,
122					     (u_char *)&ni->rip_metric +
123					     sizeof(ni->rip_metric));
124				printf("]");
125			}
126		} else {
127			printf(" [auth %d:",
128			       EXTRACT_16BITS(&ni->rip_tag));
129			rip_printblk((u_char *)&ni->rip_dest,
130				     (u_char *)&ni->rip_metric +
131				     sizeof(ni->rip_metric));
132			printf("]");
133		}
134	} else if (family != AF_INET) {
135		printf(" [family %d:", family);
136		rip_printblk((u_char *)&ni->rip_tag,
137			     (u_char *)&ni->rip_metric +
138			     sizeof(ni->rip_metric));
139		printf("]");
140		return;
141	} else { /* AF_INET */
142		printf(" {%s", ipaddr_string(&ni->rip_dest));
143		if (ni->rip_dest_mask)
144			printf("/%s", ipaddr_string(&ni->rip_dest_mask));
145		if (ni->rip_router)
146			printf("->%s", ipaddr_string(&ni->rip_router));
147		if (ni->rip_tag)
148			printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
149		printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
150	}
151}
152
153void
154rip_print(const u_char *dat, u_int length)
155{
156	const struct rip *rp;
157	const struct rip_netinfo *ni;
158	int i, j, trunc;
159
160	i = min(length, snapend - dat) - sizeof(*rp);
161	if (i < 0) {
162		printf("[|rip]");
163		return;
164	}
165
166	rp = (struct rip *)dat;
167	switch (rp->rip_vers) {
168	case 0:
169		/* RFC 1058 */
170		printf("RIPv0: ");
171		rip_printblk((u_char *)(rp + 1), snapend);
172		break;
173	default:
174		switch (rp->rip_cmd) {
175		case RIPCMD_REQUEST:
176			printf("RIPv%d-req %d", rp->rip_vers, length);
177			break;
178		case RIPCMD_RESPONSE:
179			j = length / sizeof(*ni);
180			if (j * sizeof(*ni) != length - 4)
181				printf("RIPv%d-resp [items %d] [%d]:",
182				       rp->rip_vers, j, length);
183			else
184				printf("RIPv%d-resp [items %d]:",
185				       rp->rip_vers, j);
186			trunc = (i / sizeof(*ni)) != j;
187			ni = (struct rip_netinfo *)(rp + 1);
188			for (; (i -= sizeof(*ni)) >= 0; ++ni) {
189				if (rp->rip_vers == 1)
190					rip_entry_print_v1(rp->rip_vers, ni);
191				else
192					rip_entry_print_v2(rp->rip_vers, ni);
193			}
194			if (trunc)
195				printf("[|rip]");
196			break;
197		case RIPCMD_TRACEON:
198			printf("RIPv%d-traceon %d: \"", rp->rip_vers, length);
199			(void)fn_print((const u_char *)(rp + 1), snapend);
200			fputs("\"", stdout);
201			break;
202		case RIPCMD_TRACEOFF:
203			printf("RIPv%d-traceoff %d", rp->rip_vers, length);
204			break;
205		case RIPCMD_POLL:
206			printf("RIPv%d-poll %d", rp->rip_vers, length);
207			break;
208		case RIPCMD_POLLENTRY:
209			printf("RIPv%d-pollentry %d", rp->rip_vers, length);
210			break;
211		default:
212			printf("RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
213			       length);
214			break;
215		}
216        }
217}
218