print-dhcp6.c revision 56893 
1/*
2 * Copyright (C) 1998 and 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char rcsid[] =
32    "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.3 1999/12/22 06:27:20 itojun Exp $";
33#endif
34
35#ifdef HAVE_CONFIG_H
36#include "config.h"
37#endif
38
39#include <sys/param.h>
40#include <sys/time.h>
41#include <sys/socket.h>
42
43#if __STDC__
44struct mbuf;
45struct rtentry;
46#endif
47#include <net/if.h>
48
49#include <netinet/in.h>
50
51#include <ctype.h>
52#ifdef HAVE_MEMORY_H
53#include <memory.h>
54#endif
55#include <stdio.h>
56#include <string.h>
57#include <arpa/inet.h>
58
59#include "interface.h"
60#include "addrtoname.h"
61#include "dhcp6.h"
62#include "dhcp6opt.h"
63
64#if 0
65static void dhcp6opttab_init __P((void));
66static struct dhcp6_opt *dhcp6opttab_byname __P((char *));
67#endif
68static struct dhcp6_opt *dhcp6opttab_bycode __P((u_int));
69
70static char tstr[] = " [|dhcp6]";
71
72static struct dhcp6_opt dh6opttab[] = {
73	/* IP Address Extension */
74	{ 1, OL6_N,	"IP Address",			OT6_NONE, },
75
76	/* General Extension */
77	{ 2, 4,		"Time Offset",			OT6_NUM, },
78	{ 3, OL6_N,	"IEEE 1003.1 POSIX Timezone",	OT6_STR, },
79	{ 6, OL6_16N,	"Domain Name Server",		OT6_V6, },
80	{ 10, OL6_N,	"Domain Name",			OT6_STR, },
81
82	/* Application and Service Parameters */
83	{ 16, OL6_N,	"Directory Agent",		OT6_NONE, },
84	{ 17, OL6_N,	"Service Scope"	,		OT6_NONE, },
85	{ 18, OL6_16N,	"Network Time Protocol Servers", OT6_V6, },
86	{ 19, OL6_N,	"NIS Domain",			OT6_STR, },
87	{ 20, OL6_16N,	"NIS Servers",			OT6_V6, },
88	{ 21, OL6_N,	"NIS+ Domain",			OT6_STR, },
89	{ 22, OL6_16N,	"NIS+ Servers",			OT6_V6, },
90
91	/* TCP Parameters */
92	{ 32, 4,	"TCP Keepalive Interval",	OT6_NUM, },
93
94	/* DHCPv6 Extensions */
95	{ 40, 4,	"Maximum DHCPv6 Message Size",	OT6_NUM, },
96	{ 41, OL6_N,	"DHCP Retransmission and Configuration Parameter",
97							OT6_NONE, },
98	{ 48, OL6_N,	"Platform Specific Information", OT6_NONE, },
99	{ 49, OL6_N,	"Platform Class Identifier",	OT6_STR, },
100	{ 64, OL6_N,	"Class Identifier",		OT6_STR, },
101	{ 66, 16,	"Reconfigure Multicast Address", OT6_V6, },
102	{ 67, 16,	"Renumber DHCPv6 Server Address",
103							OT6_V6, },
104	{ 68, OL6_N,	"DHCP Relay ICMP Error Message", OT6_NONE, },
105	{ 84, OL6_N,	"Client-Server Authentication",	OT6_NONE, },
106	{ 85, 4,	"Client Key Selection",		OT6_NUM, },
107
108	/* End Extension */
109	{ 65536, OL6_Z,	"End",				OT6_NONE, },
110
111	{ 0 },
112};
113
114#if 0
115static struct dhcp6_opt *dh6o_pad;
116static struct dhcp6_opt *dh6o_end;
117
118static void
119dhcp6opttab_init()
120{
121	dh6o_pad = dhcp6opttab_bycode(0);
122	dh6o_end = dhcp6opttab_bycode(65536);
123}
124#endif
125
126#if 0
127static struct dhcp6_opt *
128dhcp6opttab_byname(name)
129	char *name;
130{
131	struct dhcp6_opt *p;
132
133	for (p = dh6opttab; p->code; p++)
134		if (strcmp(name, p->name) == 0)
135			return p;
136	return NULL;
137}
138#endif
139
140static struct dhcp6_opt *
141dhcp6opttab_bycode(code)
142	u_int code;
143{
144	struct dhcp6_opt *p;
145
146	for (p = dh6opttab; p->code; p++)
147		if (p->code == code)
148			return p;
149	return NULL;
150}
151
152static void
153dhcp6ext_print(u_char *cp, u_char *ep)
154{
155	u_int16_t code, len;
156	struct dhcp6_opt *p;
157	char buf[BUFSIZ];
158	int i;
159
160	if (cp == ep)
161		return;
162	printf(" ");
163	while (cp < ep) {
164		code = ntohs(*(u_int16_t *)&cp[0]);
165		if (code != 65535)
166			len = ntohs(*(u_int16_t *)&cp[2]);
167		else
168			len = 0;
169		p = dhcp6opttab_bycode(code);
170		if (p == NULL) {
171			printf("(unknown, len=%d)", len);
172			cp += len + 4;
173			continue;
174		}
175
176		/* sanity check on length */
177		switch (p->len) {
178		case OL6_N:
179			break;
180		case OL6_16N:
181			if (len % 16 != 0)
182				goto trunc;
183			break;
184		case OL6_Z:
185			if (len != 0)
186				goto trunc;
187			break;
188		default:
189			if (len != p->len)
190				goto trunc;
191			break;
192		}
193		if (cp + 4 + len > ep) {
194			printf("[|%s]", p->name);
195			return;
196		}
197
198		printf("(%s, ", p->name);
199		switch (p->type) {
200		case OT6_V6:
201			for (i = 0; i < len; i += 16) {
202				inet_ntop(AF_INET6, &cp[4 + i], buf,
203					sizeof(buf));
204				if (i != 0)
205					printf(",");
206				printf("%s", buf);
207			}
208			break;
209		case OT6_STR:
210			memset(&buf, 0, sizeof(buf));
211			strncpy(buf, &cp[4], len);
212			printf("%s", buf);
213			break;
214		case OT6_NUM:
215			printf("%d", (u_int32_t)ntohl(*(u_int32_t *)&cp[4]));
216			break;
217		default:
218			for (i = 0; i < len; i++)
219				printf("%02x", cp[4 + i] & 0xff);
220		}
221		printf(")");
222		cp += len + 4;
223	}
224	return;
225
226trunc:
227	printf("[|dhcp6ext]");
228}
229
230/*
231 * Print dhcp6 requests
232 */
233void
234dhcp6_print(register const u_char *cp, u_int length,
235	    u_short sport, u_short dport)
236{
237	union dhcp6 *dh6;
238	u_char *ep;
239	u_char *extp;
240
241	printf("dhcp6");
242
243	ep = (u_char *)snapend;
244
245	dh6 = (union dhcp6 *)cp;
246	TCHECK(dh6->dh6_msgtype);
247	switch (dh6->dh6_msgtype) {
248	case DH6_SOLICIT:
249		if (vflag && TTEST(dh6->dh6_sol.dh6sol_relayaddr)) {
250			printf(" solicit(");
251			if ((dh6->dh6_sol.dh6sol_flags & DH6SOL_CLOSE) != 0)
252				printf("C");
253			if (dh6->dh6_sol.dh6sol_flags != 0)
254				printf(" ");
255			printf("cliaddr=%s",
256				ip6addr_string(&dh6->dh6_sol.dh6sol_cliaddr));
257			printf(" relayaddr=%s",
258				ip6addr_string(&dh6->dh6_sol.dh6sol_relayaddr));
259			printf(")");
260		} else
261			printf(" solicit");
262		break;
263	case DH6_ADVERT:
264		if (!(vflag && TTEST(dh6->dh6_adv.dh6adv_serveraddr))) {
265			printf(" advert");
266			break;
267		}
268		printf(" advert(");
269		if ((dh6->dh6_adv.dh6adv_flags & DH6ADV_SERVPRESENT) != 0)
270			printf("S");
271		if (dh6->dh6_adv.dh6adv_flags != 0)
272			printf(" ");
273		printf("pref=%u", dh6->dh6_adv.dh6adv_pref);
274		printf(" cliaddr=%s",
275			ip6addr_string(&dh6->dh6_adv.dh6adv_cliaddr));
276		printf(" relayaddr=%s",
277			ip6addr_string(&dh6->dh6_adv.dh6adv_relayaddr));
278		printf(" servaddr=%s",
279			ip6addr_string(&dh6->dh6_adv.dh6adv_serveraddr));
280		extp = (u_char *)((&dh6->dh6_adv) + 1);
281		dhcp6ext_print(extp, ep);
282		printf(")");
283		break;
284	case DH6_REQUEST:
285		if (!(vflag && TTEST(dh6->dh6_req.dh6req_relayaddr))) {
286			printf(" request");
287			break;
288		}
289		printf(" request(");
290		if ((dh6->dh6_req.dh6req_flags & DH6REQ_CLOSE) != 0)
291			printf("C");
292		if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
293			printf("S");
294		if ((dh6->dh6_req.dh6req_flags & DH6REQ_REBOOT) != 0)
295			printf("R");
296		if (dh6->dh6_req.dh6req_flags != 0)
297			printf(" ");
298		printf("xid=0x%04x", dh6->dh6_req.dh6req_xid);
299		printf(" cliaddr=%s",
300			ip6addr_string(&dh6->dh6_req.dh6req_cliaddr));
301		printf(" relayaddr=%s",
302			ip6addr_string(&dh6->dh6_req.dh6req_relayaddr));
303		extp = (char *)((&dh6->dh6_req) + 1);
304		if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0) {
305			printf(" servaddr=%s", ip6addr_string(extp));
306			extp += 16;
307		}
308		dhcp6ext_print(extp, ep);
309		printf(")");
310		break;
311	case DH6_REPLY:
312		if (!(vflag && TTEST(dh6->dh6_rep.dh6rep_xid))) {
313			printf(" reply");
314			break;
315		}
316		printf(" reply(");
317		if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
318			printf("C");
319		if (dh6->dh6_rep.dh6rep_flagandstat != 0)
320			printf(" ");
321		printf("stat=0x%02x",
322			dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
323		extp = (u_char *)((&dh6->dh6_rep) + 1);
324		if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0) {
325			printf(" cliaddr=%s", ip6addr_string(extp));
326			extp += 16;
327		}
328		dhcp6ext_print(extp, ep);
329		printf(")");
330		break;
331	case DH6_RELEASE:
332		printf(" release");
333		break;
334	case DH6_RECONFIG:
335		printf(" reconfig");
336		break;
337	}
338	return;
339
340trunc:
341	printf("%s", tstr);
342}
343