xref: /freebsd/contrib/tcpdump/print-domain.c (revision 8e537d168674d6b65869f73c20813001af875738)
1 /*
2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 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
23 static char rcsid[] =
24     "@(#) $Header: print-domain.c,v 1.35 96/07/23 14:17:22 leres Exp $ (LBL)";
25 #endif
26 
27 #include <sys/param.h>
28 #include <sys/time.h>
29 #include <sys/socket.h>
30 
31 #if __STDC__
32 struct mbuf;
33 struct rtentry;
34 #endif
35 #include <net/if.h>
36 
37 #include <netinet/in.h>
38 #include <netinet/if_ether.h>
39 #include <netinet/in_systm.h>
40 #include <netinet/ip.h>
41 #include <netinet/ip_var.h>
42 #include <netinet/udp.h>
43 #include <netinet/udp_var.h>
44 #include <netinet/tcp.h>
45 #include <netinet/tcpip.h>
46 
47 #undef NOERROR					/* Solaris sucks */
48 #undef T_UNSPEC					/* SINIX does too */
49 #include <arpa/nameser.h>
50 
51 #include <stdio.h>
52 
53 #include "interface.h"
54 #include "addrtoname.h"
55 #include "extract.h"                    /* must come after interface.h */
56 
57 /* Compatibility */
58 #ifndef T_TXT
59 #define T_TXT		16		/* text strings */
60 #endif
61 #ifndef T_RP
62 #define T_RP		17		/* responsible person */
63 #endif
64 #ifndef T_AFSDB
65 #define T_AFSDB		18		/* AFS cell database */
66 #endif
67 #ifndef T_X25
68 #define T_X25		19		/* X_25 calling address */
69 #endif
70 #ifndef T_ISDN
71 #define T_ISDN		20		/* ISDN calling address */
72 #endif
73 #ifndef T_RT
74 #define T_RT		21		/* router */
75 #endif
76 #ifndef T_NSAP
77 #define T_NSAP		22		/* NSAP address */
78 #endif
79 #ifndef T_NSAP_PTR
80 #define T_NSAP_PTR	23		/* reverse NSAP lookup (deprecated) */
81 #endif
82 #ifndef T_SIG
83 #define T_SIG		24		/* security signature */
84 #endif
85 #ifndef T_KEY
86 #define T_KEY		25		/* security key */
87 #endif
88 #ifndef T_PX
89 #define T_PX		26		/* X.400 mail mapping */
90 #endif
91 #ifndef T_GPOS
92 #define T_GPOS		27		/* geographical position (withdrawn) */
93 #endif
94 #ifndef T_AAAA
95 #define T_AAAA		28		/* IP6 Address */
96 #endif
97 #ifndef T_LOC
98 #define T_LOC		29		/* Location Information */
99 #endif
100 
101 #ifndef T_UNSPEC
102 #define T_UNSPEC	103		/* Unspecified format (binary data) */
103 #endif
104 #ifndef T_UNSPECA
105 #define T_UNSPECA	104		/* "unspecified ascii". Ugly MIT hack */
106 #endif
107 
108 #ifndef C_CHAOS
109 #define C_CHAOS		3		/* for chaos net (MIT) */
110 #endif
111 #ifndef C_HS
112 #define C_HS		4		/* for Hesiod name server (MIT) (XXX) */
113 #endif
114 
115 static char *ns_ops[] = {
116 	"", " inv_q", " stat", " op3", " notify", " op5", " op6", " op7",
117 	" op8", " updataA", " updateD", " updateDA",
118 	" updateM", " updateMA", " zoneInit", " zoneRef",
119 };
120 
121 static char *ns_resp[] = {
122 	"", " FormErr", " ServFail", " NXDomain",
123 	" NotImp", " Refused", " Resp6", " Resp7",
124 	" Resp8", " Resp9", " Resp10", " Resp11",
125 	" Resp12", " Resp13", " Resp14", " NoChange",
126 };
127 
128 /* skip over a domain name */
129 static const u_char *
130 ns_nskip(register const u_char *cp, register const u_char *bp)
131 {
132 	register u_char i;
133 
134 	if (((i = *cp++) & INDIR_MASK) == INDIR_MASK)
135 		return (cp + 1);
136 	while (i && cp < snapend) {
137 		cp += i;
138 		i = *cp++;
139 	}
140 	return (cp);
141 }
142 
143 /* print a <domain-name> */
144 static const u_char *
145 ns_nprint(register const u_char *cp, register const u_char *bp)
146 {
147 	register u_int i;
148 	register const u_char *rp;
149 	register int compress;
150 
151 	i = *cp++;
152 	rp = cp + i;
153 	if ((i & INDIR_MASK) == INDIR_MASK) {
154 		rp = cp + 1;
155 		compress = 1;
156 	} else
157 		compress = 0;
158 	if (i != 0)
159 		while (i && cp < snapend) {
160 			if ((i & INDIR_MASK) == INDIR_MASK) {
161 				cp = bp + (((i << 8) | *cp) & 0x3fff);
162 				i = *cp++;
163 				continue;
164 			}
165 			if (fn_printn(cp, i, snapend))
166 				break;
167 			cp += i;
168 			putchar('.');
169 			i = *cp++;
170 			if (!compress)
171 				rp += i + 1;
172 		}
173 	else
174 		putchar('.');
175 	return (rp);
176 }
177 
178 /* print a <character-string> */
179 static const u_char *
180 ns_cprint(register const u_char *cp, register const u_char *bp)
181 {
182 	register u_int i;
183 
184 	i = *cp++;
185 	(void)fn_printn(cp, i, snapend);
186 	return (cp + i);
187 }
188 
189 static struct tok type2str[] = {
190 	{ T_A,		"A" },
191 	{ T_NS,		"NS" },
192 	{ T_MD,		"MD" },
193 	{ T_MF,		"MF" },
194 	{ T_CNAME,	"CNAME" },
195 	{ T_SOA,	"SOA" },
196 	{ T_MB,		"MB" },
197 	{ T_MG,		"MG" },
198 	{ T_MR,		"MR" },
199 	{ T_NULL,	"NULL" },
200 	{ T_WKS,	"WKS" },
201 	{ T_PTR,	"PTR" },
202 	{ T_HINFO,	"HINFO" },
203 	{ T_MINFO,	"MINFO" },
204 	{ T_MX,		"MX" },
205 	{ T_TXT,	"TXT" },
206 	{ T_RP,		"RP" },
207 	{ T_AFSDB,	"AFSDB" },
208 	{ T_X25,	"X25" },
209 	{ T_ISDN,	"ISDN" },
210 	{ T_RT,		"RT" },
211 	{ T_NSAP,	"NSAP" },
212 	{ T_NSAP_PTR,	"NSAP_PTR" },
213 	{ T_SIG,	"SIG" },
214 	{ T_KEY,	"KEY" },
215 	{ T_PX,		"PX" },
216 	{ T_GPOS,	"GPOS" },
217 	{ T_AAAA,	"AAAA" },
218 	{ T_LOC ,	"LOC " },
219 	{ T_UINFO,	"UINFO" },
220 	{ T_UID,	"UID" },
221 	{ T_GID,	"GID" },
222 	{ T_UNSPEC,	"UNSPEC" },
223 	{ T_UNSPECA,	"UNSPECA" },
224 	{ T_AXFR,	"AXFR" },
225 	{ T_MAILB,	"MAILB" },
226 	{ T_MAILA,	"MAILA" },
227 	{ T_ANY,	"ANY" },
228 	{ 0,		NULL }
229 };
230 
231 static struct tok class2str[] = {
232 	{ C_IN,		"IN" },		/* Not used */
233 	{ C_CHAOS,	"CHAOS)" },
234 	{ C_HS,		"HS" },
235 	{ C_ANY,	"ANY" },
236 	{ 0,		NULL }
237 };
238 
239 /* print a query */
240 static void
241 ns_qprint(register const u_char *cp, register const u_char *bp)
242 {
243 	register const u_char *np = cp;
244 	register u_int i;
245 
246 	cp = ns_nskip(cp, bp);
247 
248 	if (cp + 4 > snapend)
249 		return;
250 
251 	/* print the qtype and qclass (if it's not IN) */
252 	i = *cp++ << 8;
253 	i |= *cp++;
254 	printf(" %s", tok2str(type2str, "Type%d", i));
255 	i = *cp++ << 8;
256 	i |= *cp++;
257 	if (i != C_IN)
258 		printf(" %s", tok2str(class2str, "(Class %d)", i));
259 
260 	fputs("? ", stdout);
261 	ns_nprint(np, bp);
262 }
263 
264 /* print a reply */
265 static const u_char *
266 ns_rprint(register const u_char *cp, register const u_char *bp)
267 {
268 	register u_int i;
269 	register u_short typ, len;
270 	register const u_char *rp;
271 
272 	if (vflag) {
273 		putchar(' ');
274 		cp = ns_nprint(cp, bp);
275 	} else
276 		cp = ns_nskip(cp, bp);
277 
278 	if (cp + 10 > snapend)
279 		return (snapend);
280 
281 	/* print the type/qtype and class (if it's not IN) */
282 	typ = *cp++ << 8;
283 	typ |= *cp++;
284 	i = *cp++ << 8;
285 	i |= *cp++;
286 	if (i != C_IN)
287 		printf(" %s", tok2str(class2str, "(Class %d)", i));
288 
289 	/* ignore ttl */
290 	cp += 4;
291 
292 	len = *cp++ << 8;
293 	len |= *cp++;
294 
295 	rp = cp + len;
296 
297 	printf(" %s", tok2str(type2str, "Type%d", typ));
298 	switch (typ) {
299 
300 	case T_A:
301 		printf(" %s", ipaddr_string(cp));
302 		break;
303 
304 	case T_NS:
305 	case T_CNAME:
306 	case T_PTR:
307 		putchar(' ');
308 		(void)ns_nprint(cp, bp);
309 		break;
310 
311 	case T_MX:
312 		putchar(' ');
313 		(void)ns_nprint(cp + 2, bp);
314 		printf(" %d", EXTRACT_16BITS(cp));
315 		break;
316 
317 	case T_TXT:
318 		putchar(' ');
319 		(void)ns_cprint(cp, bp);
320 		break;
321 
322 	case T_UNSPECA:		/* One long string */
323 	        printf(" %.*s", len, cp);
324 		break;
325 	}
326 	return (rp);		/* XXX This isn't always right*/
327 }
328 
329 void
330 ns_print(register const u_char *bp, u_int length)
331 {
332 	register const HEADER *np;
333 	register int qdcount, ancount, nscount, arcount;
334 	register const u_char *cp;
335 
336 	np = (const HEADER *)bp;
337 	/* get the byte-order right */
338 	qdcount = ntohs(np->qdcount);
339 	ancount = ntohs(np->ancount);
340 	nscount = ntohs(np->nscount);
341 	arcount = ntohs(np->arcount);
342 
343 	if (np->qr) {
344 		/* this is a response */
345 		printf(" %d%s%s%s%s%s",
346 			ntohs(np->id),
347 			ns_ops[np->opcode],
348 			ns_resp[np->rcode],
349 			np->aa? "*" : "",
350 			np->ra? "" : "-",
351 			np->tc? "|" : "");
352 		if (qdcount != 1)
353 			printf(" [%dq]", qdcount);
354 		/* Print QUESTION section on -vv */
355 		if (vflag > 1) {
356 		            fputs(" q: ", stdout);
357 			    cp = ns_nprint((const u_char *)(np + 1), bp);
358 		} else
359 			    cp = ns_nskip((const u_char *)(np + 1), bp);
360 		printf(" %d/%d/%d", ancount, nscount, arcount);
361 		if (ancount--) {
362 			cp = ns_rprint(cp + 4, bp);
363 			while (ancount-- && cp < snapend) {
364 				putchar(',');
365 				cp = ns_rprint(cp, bp);
366 			}
367 		}
368 	}
369 	else {
370 		/* this is a request */
371 		printf(" %d%s%s",
372 		        ntohs(np->id),
373 			ns_ops[np->opcode],
374 			np->rd? "+" : "");
375 
376 		/* any weirdness? */
377 		if (*(((u_short *)np)+1) & htons(0x6ff))
378 			printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1)));
379 
380 		if (np->opcode == IQUERY) {
381 			if (qdcount)
382 				printf(" [%dq]", qdcount);
383 			if (ancount != 1)
384 				printf(" [%da]", ancount);
385 		}
386 		else {
387 			if (ancount)
388 				printf(" [%da]", ancount);
389 			if (qdcount != 1)
390 				printf(" [%dq]", qdcount);
391 		}
392 		if (nscount)
393 			printf(" [%dn]", nscount);
394 		if (arcount)
395 			printf(" [%dau]", arcount);
396 
397 		ns_qprint((const u_char *)(np + 1), (const u_char *)np);
398 	}
399 	printf(" (%d)", length);
400 }
401