2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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
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.
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.86.2.3 2004/03/28 20:54:00 fenner Exp $ (LBL)";
31 #include <tcpdump-stdinc.h>
38 #include "interface.h"
39 #include "addrtoname.h"
40 #include "extract.h" /* must come after interface.h */
42 static const char *ns_ops[] = {
43 "", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
44 " op8", " updataA", " updateD", " updateDA",
45 " updateM", " updateMA", " zoneInit", " zoneRef",
48 static const char *ns_resp[] = {
49 "", " FormErr", " ServFail", " NXDomain",
50 " NotImp", " Refused", " YXDomain", " YXRRSet",
51 " NXRRSet", " NotAuth", " NotZone", " Resp11",
52 " Resp12", " Resp13", " Resp14", " NoChange",
55 /* skip over a domain name */
57 ns_nskip(register const u_char *cp)
65 if ((i & INDIR_MASK) == INDIR_MASK)
67 if ((i & INDIR_MASK) == EDNS0_MASK) {
70 if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
71 return(NULL); /* unknown ELT */
74 if ((bitlen = *cp++) == 0)
76 bytelen = (bitlen + 7) / 8;
87 /* print a <domain-name> */
89 blabel_print(const u_char *cp)
92 const u_char *bitp, *lim;
97 if ((bitlen = *cp) == 0)
99 slen = (bitlen + 3) / 4;
102 /* print the bit string as a hex string */
104 for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
106 printf("%02x", *bitp);
111 printf("%02x", tc & (0xff << (8 - b)));
115 printf("%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
117 printf("/%d]", bitlen);
120 printf(".../%d]", bitlen);
125 labellen(const u_char *cp)
132 if ((i & INDIR_MASK) == EDNS0_MASK) {
135 if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL)
137 if (!TTEST2(*(cp + 1), 1))
139 if ((bitlen = *(cp + 1)) == 0)
141 return(((bitlen + 7) / 8) + 1);
146 static const u_char *
147 ns_nprint(register const u_char *cp, register const u_char *bp)
150 register const u_char *rp = NULL;
151 register int compress = 0;
154 int data_size = snapend - bp;
156 if ((l = labellen(cp)) == (u_int)-1)
161 if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
167 while (i && cp < snapend) {
168 if ((i & INDIR_MASK) == INDIR_MASK) {
175 cp = bp + (((i << 8) | *cp) & 0x3fff);
176 if ((l = labellen(cp)) == (u_int)-1)
184 * If we've looked at every character in
185 * the message, this pointer will make
186 * us look at some character again,
187 * which means we're looping.
189 if (chars_processed >= data_size) {
195 if ((i & INDIR_MASK) == EDNS0_MASK) {
196 elt = (i & ~INDIR_MASK);
198 case EDNS0_ELT_BITLABEL:
199 if (blabel_print(cp) == NULL)
204 printf("<ELT %d>", elt);
208 if (fn_printn(cp, l, snapend))
213 chars_processed += l;
215 if ((l = labellen(cp)) == (u_int)-1)
229 /* print a <character-string> */
230 static const u_char *
231 ns_cprint(register const u_char *cp)
238 if (fn_printn(cp, i, snapend))
243 /* http://www.iana.org/assignments/dns-parameters */
244 struct tok ns_type2str[] = {
245 { T_A, "A" }, /* RFC 1035 */
246 { T_NS, "NS" }, /* RFC 1035 */
247 { T_MD, "MD" }, /* RFC 1035 */
248 { T_MF, "MF" }, /* RFC 1035 */
249 { T_CNAME, "CNAME" }, /* RFC 1035 */
250 { T_SOA, "SOA" }, /* RFC 1035 */
251 { T_MB, "MB" }, /* RFC 1035 */
252 { T_MG, "MG" }, /* RFC 1035 */
253 { T_MR, "MR" }, /* RFC 1035 */
254 { T_NULL, "NULL" }, /* RFC 1035 */
255 { T_WKS, "WKS" }, /* RFC 1035 */
256 { T_PTR, "PTR" }, /* RFC 1035 */
257 { T_HINFO, "HINFO" }, /* RFC 1035 */
258 { T_MINFO, "MINFO" }, /* RFC 1035 */
259 { T_MX, "MX" }, /* RFC 1035 */
260 { T_TXT, "TXT" }, /* RFC 1035 */
261 { T_RP, "RP" }, /* RFC 1183 */
262 { T_AFSDB, "AFSDB" }, /* RFC 1183 */
263 { T_X25, "X25" }, /* RFC 1183 */
264 { T_ISDN, "ISDN" }, /* RFC 1183 */
265 { T_RT, "RT" }, /* RFC 1183 */
266 { T_NSAP, "NSAP" }, /* RFC 1706 */
267 { T_NSAP_PTR, "NSAP_PTR" },
268 { T_SIG, "SIG" }, /* RFC 2535 */
269 { T_KEY, "KEY" }, /* RFC 2535 */
270 { T_PX, "PX" }, /* RFC 2163 */
271 { T_GPOS, "GPOS" }, /* RFC 1712 */
272 { T_AAAA, "AAAA" }, /* RFC 1886 */
273 { T_LOC, "LOC" }, /* RFC 1876 */
274 { T_NXT, "NXT" }, /* RFC 2535 */
275 { T_EID, "EID" }, /* Nimrod */
276 { T_NIMLOC, "NIMLOC" }, /* Nimrod */
277 { T_SRV, "SRV" }, /* RFC 2782 */
278 { T_ATMA, "ATMA" }, /* ATM Forum */
279 { T_NAPTR, "NAPTR" }, /* RFC 2168, RFC 2915 */
280 { T_A6, "A6" }, /* RFC 2874 */
281 { T_DNAME, "DNAME" }, /* RFC 2672 */
282 { T_OPT, "OPT" }, /* RFC 2671 */
283 { T_UINFO, "UINFO" },
286 { T_UNSPEC, "UNSPEC" },
287 { T_UNSPECA, "UNSPECA" },
288 { T_TKEY, "TKEY" }, /* RFC 2930 */
289 { T_TSIG, "TSIG" }, /* RFC 2845 */
290 { T_IXFR, "IXFR" }, /* RFC 1995 */
291 { T_AXFR, "AXFR" }, /* RFC 1035 */
292 { T_MAILB, "MAILB" }, /* RFC 1035 */
293 { T_MAILA, "MAILA" }, /* RFC 1035 */
298 struct tok ns_class2str[] = {
299 { C_IN, "IN" }, /* Not used */
300 { C_CHAOS, "CHAOS" },
307 static const u_char *
308 ns_qprint(register const u_char *cp, register const u_char *bp, int is_mdns)
310 register const u_char *np = cp;
315 if (cp == NULL || !TTEST2(*cp, 4))
318 /* print the qtype and qclass (if it's not IN) */
319 i = EXTRACT_16BITS(cp);
321 printf(" %s", tok2str(ns_type2str, "Type%d", i));
322 i = EXTRACT_16BITS(cp);
324 if (is_mdns && i == (C_IN|C_CACHE_FLUSH))
325 printf(" (Cache flush)");
327 printf(" %s", tok2str(ns_class2str, "(Class %d)", i));
330 cp = ns_nprint(np, bp);
331 return(cp ? cp + 4 : NULL);
335 static const u_char *
336 ns_rprint(register const u_char *cp, register const u_char *bp, int is_mdns)
338 register u_int class;
339 register u_short typ, len;
340 register const u_char *rp;
344 if ((cp = ns_nprint(cp, bp)) == NULL)
349 if (cp == NULL || !TTEST2(*cp, 10))
352 /* print the type/qtype and class (if it's not IN) */
353 typ = EXTRACT_16BITS(cp);
355 class = EXTRACT_16BITS(cp);
357 if (is_mdns && class == (C_IN|C_CACHE_FLUSH))
358 printf(" (Cache flush)");
359 else if (class != C_IN && typ != T_OPT)
360 printf(" %s", tok2str(ns_class2str, "(Class %d)", class));
365 len = EXTRACT_16BITS(cp);
370 printf(" %s", tok2str(ns_type2str, "Type%d", typ));
376 if (!TTEST2(*cp, sizeof(struct in_addr)))
378 printf(" %s", ipaddr_string(cp));
388 if (ns_nprint(cp, bp) == NULL)
396 if ((cp = ns_nprint(cp, bp)) == NULL)
399 if ((cp = ns_nprint(cp, bp)) == NULL)
401 if (!TTEST2(*cp, 5 * 4))
403 printf(" %u", EXTRACT_32BITS(cp));
405 printf(" %u", EXTRACT_32BITS(cp));
407 printf(" %u", EXTRACT_32BITS(cp));
409 printf(" %u", EXTRACT_32BITS(cp));
411 printf(" %u", EXTRACT_32BITS(cp));
418 if (ns_nprint(cp + 2, bp) == NULL)
420 printf(" %d", EXTRACT_16BITS(cp));
437 if (ns_nprint(cp + 6, bp) == NULL)
439 printf(":%d %d %d", EXTRACT_16BITS(cp + 4),
440 EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2));
445 if (!TTEST2(*cp, sizeof(struct in6_addr)))
447 printf(" %s", ip6addr_string(cp));
458 pbyte = (pbit & ~7) / 8;
460 printf(" %u(bad plen)", pbit);
462 } else if (pbit < 128) {
463 if (!TTEST2(*(cp + 1), sizeof(a) - pbyte))
465 memset(&a, 0, sizeof(a));
466 memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
467 printf(" %u %s", pbit, ip6addr_string(&a));
471 if (ns_nprint(cp + 1 + sizeof(a) - pbyte, bp) == NULL)
479 printf(" UDPsize=%u", class);
482 case T_UNSPECA: /* One long string */
483 if (!TTEST2(*cp, len))
485 if (fn_printn(cp, len, snapend))
491 if (cp + len > snapend)
496 if ((cp = ns_nprint(cp, bp)) == NULL)
501 printf(" fudge=%u", EXTRACT_16BITS(cp));
505 printf(" maclen=%u", EXTRACT_16BITS(cp));
506 cp += 2 + EXTRACT_16BITS(cp);
509 printf(" origid=%u", EXTRACT_16BITS(cp));
513 printf(" error=%u", EXTRACT_16BITS(cp));
517 printf(" otherlen=%u", EXTRACT_16BITS(cp));
521 return (rp); /* XXX This isn't always right */
525 ns_print(register const u_char *bp, u_int length, int is_mdns)
527 register const HEADER *np;
528 register int qdcount, ancount, nscount, arcount;
529 register const u_char *cp;
532 np = (const HEADER *)bp;
534 /* get the byte-order right */
535 qdcount = EXTRACT_16BITS(&np->qdcount);
536 ancount = EXTRACT_16BITS(&np->ancount);
537 nscount = EXTRACT_16BITS(&np->nscount);
538 arcount = EXTRACT_16BITS(&np->arcount);
541 /* this is a response */
542 printf(" %d%s%s%s%s%s%s",
543 EXTRACT_16BITS(&np->id),
544 ns_ops[DNS_OPCODE(np)],
545 ns_resp[DNS_RCODE(np)],
546 DNS_AA(np)? "*" : "",
547 DNS_RA(np)? "" : "-",
548 DNS_TC(np)? "|" : "",
549 DNS_AD(np)? "$" : "");
552 printf(" [%dq]", qdcount);
553 /* Print QUESTION section on -vv */
554 cp = (const u_char *)(np + 1);
556 if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
559 fputs(" q:", stdout);
560 if ((cp = ns_qprint(cp, bp, is_mdns)) == NULL)
563 if ((cp = ns_nskip(cp)) == NULL)
565 cp += 4; /* skip QTYPE and QCLASS */
568 printf(" %d/%d/%d", ancount, nscount, arcount);
570 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
572 while (cp < snapend && ancount--) {
574 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
580 /* Print NS and AR sections on -vv */
582 if (cp < snapend && nscount--) {
583 fputs(" ns:", stdout);
584 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
586 while (cp < snapend && nscount--) {
588 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
594 if (cp < snapend && arcount--) {
595 fputs(" ar:", stdout);
596 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
598 while (cp < snapend && arcount--) {
600 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
609 /* this is a request */
610 printf(" %d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
611 DNS_RD(np) ? "+" : "",
612 DNS_CD(np) ? "%" : "");
615 b2 = EXTRACT_16BITS(((u_short *)np)+1);
617 printf(" [b2&3=0x%x]", b2);
619 if (DNS_OPCODE(np) == IQUERY) {
621 printf(" [%dq]", qdcount);
623 printf(" [%da]", ancount);
627 printf(" [%da]", ancount);
629 printf(" [%dq]", qdcount);
632 printf(" [%dn]", nscount);
634 printf(" [%dau]", arcount);
636 cp = (const u_char *)(np + 1);
638 cp = ns_qprint(cp, (const u_char *)np, is_mdns);
641 while (cp < snapend && qdcount--) {
642 cp = ns_qprint((const u_char *)cp,
652 /* Print remaining sections on -vv */
655 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
657 while (cp < snapend && ancount--) {
659 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
665 if (cp < snapend && nscount--) {
666 fputs(" ns:", stdout);
667 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
669 while (nscount-- && cp < snapend) {
671 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
677 if (cp < snapend && arcount--) {
678 fputs(" ar:", stdout);
679 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
681 while (cp < snapend && arcount--) {
683 if ((cp = ns_rprint(cp, bp, is_mdns)) == NULL)
691 printf(" (%d)", length);