1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 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 * $FreeBSD$ 22 */ 23 24 #ifndef lint 25 static const char rcsid[] = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-domain.c,v 1.42 1999/11/21 09:36:50 fenner Exp $ (LBL)"; 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/socket.h> 36 37 #if __STDC__ 38 struct mbuf; 39 struct rtentry; 40 #endif 41 #include <net/if.h> 42 43 #include <netinet/in.h> 44 #include <net/ethernet.h> 45 #include <netinet/in_systm.h> 46 #include <netinet/ip.h> 47 #include <netinet/ip_var.h> 48 #include <netinet/udp.h> 49 #include <netinet/udp_var.h> 50 #include <netinet/tcp.h> 51 52 #ifdef NOERROR 53 #undef NOERROR /* Solaris sucks */ 54 #endif 55 #ifdef NOERROR 56 #undef T_UNSPEC /* SINIX does too */ 57 #endif 58 #include <arpa/nameser.h> 59 60 #include <stdio.h> 61 #include <string.h> 62 63 #include "interface.h" 64 #include "addrtoname.h" 65 #include "extract.h" /* must come after interface.h */ 66 67 /* Compatibility */ 68 #ifndef T_TXT 69 #define T_TXT 16 /* text strings */ 70 #endif 71 #ifndef T_RP 72 #define T_RP 17 /* responsible person */ 73 #endif 74 #ifndef T_AFSDB 75 #define T_AFSDB 18 /* AFS cell database */ 76 #endif 77 #ifndef T_X25 78 #define T_X25 19 /* X_25 calling address */ 79 #endif 80 #ifndef T_ISDN 81 #define T_ISDN 20 /* ISDN calling address */ 82 #endif 83 #ifndef T_RT 84 #define T_RT 21 /* router */ 85 #endif 86 #ifndef T_NSAP 87 #define T_NSAP 22 /* NSAP address */ 88 #endif 89 #ifndef T_NSAP_PTR 90 #define T_NSAP_PTR 23 /* reverse NSAP lookup (deprecated) */ 91 #endif 92 #ifndef T_SIG 93 #define T_SIG 24 /* security signature */ 94 #endif 95 #ifndef T_KEY 96 #define T_KEY 25 /* security key */ 97 #endif 98 #ifndef T_PX 99 #define T_PX 26 /* X.400 mail mapping */ 100 #endif 101 #ifndef T_GPOS 102 #define T_GPOS 27 /* geographical position (withdrawn) */ 103 #endif 104 #ifndef T_AAAA 105 #define T_AAAA 28 /* IP6 Address */ 106 #endif 107 #ifndef T_LOC 108 #define T_LOC 29 /* Location Information */ 109 #endif 110 #ifndef T_NXT 111 #define T_NXT 30 /* Next Valid Name in Zone */ 112 #endif 113 #ifndef T_EID 114 #define T_EID 31 /* Endpoint identifier */ 115 #endif 116 #ifndef T_NIMLOC 117 #define T_NIMLOC 32 /* Nimrod locator */ 118 #endif 119 #ifndef T_SRV 120 #define T_SRV 33 /* Server selection */ 121 #endif 122 #ifndef T_ATMA 123 #define T_ATMA 34 /* ATM Address */ 124 #endif 125 #ifndef T_NAPTR 126 #define T_NAPTR 35 /* Naming Authority PoinTeR */ 127 #endif 128 #ifndef T_A6 129 #define T_A6 38 /* IP6 address (ipngwg-dns-lookups) */ 130 #endif 131 132 #ifndef T_UNSPEC 133 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 134 #endif 135 #ifndef T_UNSPECA 136 #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ 137 #endif 138 139 #ifndef C_CHAOS 140 #define C_CHAOS 3 /* for chaos net (MIT) */ 141 #endif 142 #ifndef C_HS 143 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 144 #endif 145 146 static char *ns_ops[] = { 147 "", " inv_q", " stat", " op3", " notify", " op5", " op6", " op7", 148 " op8", " updataA", " updateD", " updateDA", 149 " updateM", " updateMA", " zoneInit", " zoneRef", 150 }; 151 152 static char *ns_resp[] = { 153 "", " FormErr", " ServFail", " NXDomain", 154 " NotImp", " Refused", " Resp6", " Resp7", 155 " Resp8", " Resp9", " Resp10", " Resp11", 156 " Resp12", " Resp13", " Resp14", " NoChange", 157 }; 158 159 /* skip over a domain name */ 160 static const u_char * 161 ns_nskip(register const u_char *cp, register const u_char *bp) 162 { 163 register u_char i; 164 165 if (((i = *cp++) & INDIR_MASK) == INDIR_MASK) 166 return (cp + 1); 167 while (i && cp < snapend) { 168 cp += i; 169 i = *cp++; 170 } 171 return (cp); 172 } 173 174 /* print a <domain-name> */ 175 static const u_char * 176 ns_nprint(register const u_char *cp, register const u_char *bp) 177 { 178 register u_int i; 179 register const u_char *rp; 180 register int compress; 181 182 i = *cp++; 183 rp = cp + i; 184 if ((i & INDIR_MASK) == INDIR_MASK) { 185 rp = cp + 1; 186 compress = 1; 187 } else 188 compress = 0; 189 if (i != 0) 190 while (i && cp < snapend) { 191 if ((i & INDIR_MASK) == INDIR_MASK) { 192 cp = bp + (((i << 8) | *cp) & 0x3fff); 193 i = *cp++; 194 continue; 195 } 196 if (fn_printn(cp, i, snapend)) 197 break; 198 cp += i; 199 putchar('.'); 200 i = *cp++; 201 if (!compress) 202 rp += i + 1; 203 } 204 else 205 putchar('.'); 206 return (rp); 207 } 208 209 /* print a <character-string> */ 210 static const u_char * 211 ns_cprint(register const u_char *cp, register const u_char *bp) 212 { 213 register u_int i; 214 215 i = *cp++; 216 (void)fn_printn(cp, i, snapend); 217 return (cp + i); 218 } 219 220 static struct tok type2str[] = { 221 { T_A, "A" }, 222 { T_NS, "NS" }, 223 { T_MD, "MD" }, 224 { T_MF, "MF" }, 225 { T_CNAME, "CNAME" }, 226 { T_SOA, "SOA" }, 227 { T_MB, "MB" }, 228 { T_MG, "MG" }, 229 { T_MR, "MR" }, 230 { T_NULL, "NULL" }, 231 { T_WKS, "WKS" }, 232 { T_PTR, "PTR" }, 233 { T_HINFO, "HINFO" }, 234 { T_MINFO, "MINFO" }, 235 { T_MX, "MX" }, 236 { T_TXT, "TXT" }, 237 { T_RP, "RP" }, 238 { T_AFSDB, "AFSDB" }, 239 { T_X25, "X25" }, 240 { T_ISDN, "ISDN" }, 241 { T_RT, "RT" }, 242 { T_NSAP, "NSAP" }, 243 { T_NSAP_PTR, "NSAP_PTR" }, 244 { T_SIG, "SIG" }, 245 { T_KEY, "KEY" }, 246 { T_PX, "PX" }, 247 { T_GPOS, "GPOS" }, 248 { T_AAAA, "AAAA" }, 249 { T_LOC, "LOC " }, 250 { T_NXT, "NXT " }, 251 { T_EID, "EID " }, 252 { T_NIMLOC, "NIMLOC " }, 253 { T_SRV, "SRV " }, 254 { T_ATMA, "ATMA " }, 255 { T_NAPTR, "NAPTR " }, 256 { T_A6, "A6 " }, 257 #ifndef T_UINFO 258 #define T_UINFO 100 259 #endif 260 { T_UINFO, "UINFO" }, 261 #ifndef T_UID 262 #define T_UID 101 263 #endif 264 { T_UID, "UID" }, 265 #ifndef T_GID 266 #define T_GID 102 267 #endif 268 { T_GID, "GID" }, 269 { T_UNSPEC, "UNSPEC" }, 270 { T_UNSPECA, "UNSPECA" }, 271 { T_AXFR, "AXFR" }, 272 { T_MAILB, "MAILB" }, 273 { T_MAILA, "MAILA" }, 274 { T_ANY, "ANY" }, 275 { 0, NULL } 276 }; 277 278 static struct tok class2str[] = { 279 { C_IN, "IN" }, /* Not used */ 280 { C_CHAOS, "CHAOS)" }, 281 { C_HS, "HS" }, 282 { C_ANY, "ANY" }, 283 { 0, NULL } 284 }; 285 286 /* print a query */ 287 static void 288 ns_qprint(register const u_char *cp, register const u_char *bp) 289 { 290 register const u_char *np = cp; 291 register u_int i; 292 293 cp = ns_nskip(cp, bp); 294 295 if (cp + 4 > snapend) 296 return; 297 298 /* print the qtype and qclass (if it's not IN) */ 299 i = *cp++ << 8; 300 i |= *cp++; 301 printf(" %s", tok2str(type2str, "Type%d", i)); 302 i = *cp++ << 8; 303 i |= *cp++; 304 if (i != C_IN) 305 printf(" %s", tok2str(class2str, "(Class %d)", i)); 306 307 fputs("? ", stdout); 308 ns_nprint(np, bp); 309 } 310 311 /* print a reply */ 312 static const u_char * 313 ns_rprint(register const u_char *cp, register const u_char *bp) 314 { 315 register u_int i; 316 register u_short typ, len; 317 register const u_char *rp; 318 319 if (vflag) { 320 putchar(' '); 321 cp = ns_nprint(cp, bp); 322 } else 323 cp = ns_nskip(cp, bp); 324 325 if (cp + 10 > snapend) 326 return (snapend); 327 328 /* print the type/qtype and class (if it's not IN) */ 329 typ = *cp++ << 8; 330 typ |= *cp++; 331 i = *cp++ << 8; 332 i |= *cp++; 333 if (i != C_IN) 334 printf(" %s", tok2str(class2str, "(Class %d)", i)); 335 336 /* ignore ttl */ 337 cp += 4; 338 339 len = *cp++ << 8; 340 len |= *cp++; 341 342 rp = cp + len; 343 344 printf(" %s", tok2str(type2str, "Type%d", typ)); 345 switch (typ) { 346 347 case T_A: 348 printf(" %s", ipaddr_string(cp)); 349 break; 350 351 case T_NS: 352 case T_CNAME: 353 case T_PTR: 354 #ifdef T_DNAME 355 case T_DNAME: /*XXX not checked as there's no server support yet*/ 356 #endif 357 putchar(' '); 358 (void)ns_nprint(cp, bp); 359 break; 360 361 case T_MX: 362 putchar(' '); 363 (void)ns_nprint(cp + 2, bp); 364 printf(" %d", EXTRACT_16BITS(cp)); 365 break; 366 367 case T_TXT: 368 putchar(' '); 369 (void)ns_cprint(cp, bp); 370 break; 371 372 #ifdef INET6 373 case T_AAAA: 374 printf(" %s", ip6addr_string(cp)); 375 break; 376 377 case T_A6: /*XXX not checked as there's no server support yet*/ 378 { 379 struct in6_addr a; 380 int pbyte; 381 382 pbyte = (*cp + 7) / 8; 383 memset(&a, 0, sizeof(a)); 384 memcpy(&a, cp + 1, pbyte); 385 printf(" %u %s ", *cp, ip6addr_string(&a)); 386 (void)ns_nprint(cp + 1 + pbyte, bp); 387 break; 388 } 389 #endif /*INET6*/ 390 391 case T_UNSPECA: /* One long string */ 392 printf(" %.*s", len, cp); 393 break; 394 } 395 return (rp); /* XXX This isn't always right */ 396 } 397 398 void 399 ns_print(register const u_char *bp, u_int length) 400 { 401 register const HEADER *np; 402 register int qdcount, ancount, nscount, arcount; 403 register const u_char *cp; 404 405 np = (const HEADER *)bp; 406 /* get the byte-order right */ 407 qdcount = ntohs(np->qdcount); 408 ancount = ntohs(np->ancount); 409 nscount = ntohs(np->nscount); 410 arcount = ntohs(np->arcount); 411 412 if (np->qr) { 413 /* this is a response */ 414 printf(" %d%s%s%s%s%s", 415 ntohs(np->id), 416 ns_ops[np->opcode], 417 ns_resp[np->rcode], 418 np->aa? "*" : "", 419 np->ra? "" : "-", 420 np->tc? "|" : ""); 421 if (qdcount != 1) 422 printf(" [%dq]", qdcount); 423 /* Print QUESTION section on -vv */ 424 if (vflag > 1) { 425 fputs(" q: ", stdout); 426 cp = ns_nprint((const u_char *)(np + 1), bp); 427 } else 428 cp = ns_nskip((const u_char *)(np + 1), bp); 429 printf(" %d/%d/%d", ancount, nscount, arcount); 430 if (ancount--) { 431 cp = ns_rprint(cp + 4, bp); 432 while (ancount-- && cp < snapend) { 433 putchar(','); 434 cp = ns_rprint(cp, bp); 435 } 436 } 437 } 438 else { 439 /* this is a request */ 440 printf(" %d%s%s", 441 ntohs(np->id), 442 ns_ops[np->opcode], 443 np->rd? "+" : ""); 444 445 /* any weirdness? */ 446 if (*(((u_short *)np)+1) & htons(0x6ff)) 447 printf(" [b2&3=0x%x]", ntohs(*(((u_short *)np)+1))); 448 449 if (np->opcode == IQUERY) { 450 if (qdcount) 451 printf(" [%dq]", qdcount); 452 if (ancount != 1) 453 printf(" [%da]", ancount); 454 } 455 else { 456 if (ancount) 457 printf(" [%da]", ancount); 458 if (qdcount != 1) 459 printf(" [%dq]", qdcount); 460 } 461 if (nscount) 462 printf(" [%dn]", nscount); 463 if (arcount) 464 printf(" [%dau]", arcount); 465 466 ns_qprint((const u_char *)(np + 1), (const u_char *)np); 467 } 468 printf(" (%d)", length); 469 } 470