1/* 2 * Copyright (C) 2001 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[] _U_ = 32 "@(#) $Header: /tcpdump/master/tcpdump/print-lwres.c,v 1.13 2004-03-24 01:54:29 guy Exp $ (LBL)"; 33#endif 34 35#ifdef HAVE_CONFIG_H 36#include "config.h" 37#endif 38 39#include <tcpdump-stdinc.h> 40 41#include "nameser.h" 42 43#include <stdio.h> 44#include <string.h> 45 46#include "interface.h" 47#include "addrtoname.h" 48#include "extract.h" /* must come after interface.h */ 49 50/* BIND9 lib/lwres/include/lwres */ 51typedef u_int32_t lwres_uint32_t; 52typedef u_int16_t lwres_uint16_t; 53typedef u_int8_t lwres_uint8_t; 54 55struct lwres_lwpacket { 56 lwres_uint32_t length; 57 lwres_uint16_t version; 58 lwres_uint16_t pktflags; 59 lwres_uint32_t serial; 60 lwres_uint32_t opcode; 61 lwres_uint32_t result; 62 lwres_uint32_t recvlength; 63 lwres_uint16_t authtype; 64 lwres_uint16_t authlength; 65}; 66 67#define LWRES_LWPACKETFLAG_RESPONSE 0x0001U /* if set, pkt is a response */ 68 69#define LWRES_LWPACKETVERSION_0 0 70 71#define LWRES_FLAG_TRUSTNOTREQUIRED 0x00000001U 72#define LWRES_FLAG_SECUREDATA 0x00000002U 73 74/* 75 * no-op 76 */ 77#define LWRES_OPCODE_NOOP 0x00000000U 78 79typedef struct { 80 /* public */ 81 lwres_uint16_t datalength; 82 /* data follows */ 83} lwres_nooprequest_t; 84 85typedef struct { 86 /* public */ 87 lwres_uint16_t datalength; 88 /* data follows */ 89} lwres_noopresponse_t; 90 91/* 92 * get addresses by name 93 */ 94#define LWRES_OPCODE_GETADDRSBYNAME 0x00010001U 95 96typedef struct lwres_addr lwres_addr_t; 97 98struct lwres_addr { 99 lwres_uint32_t family; 100 lwres_uint16_t length; 101 /* address folows */ 102}; 103 104typedef struct { 105 /* public */ 106 lwres_uint32_t flags; 107 lwres_uint32_t addrtypes; 108 lwres_uint16_t namelen; 109 /* name follows */ 110} lwres_gabnrequest_t; 111 112typedef struct { 113 /* public */ 114 lwres_uint32_t flags; 115 lwres_uint16_t naliases; 116 lwres_uint16_t naddrs; 117 lwres_uint16_t realnamelen; 118 /* aliases follows */ 119 /* addrs follows */ 120 /* realname follows */ 121} lwres_gabnresponse_t; 122 123/* 124 * get name by address 125 */ 126#define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U 127typedef struct { 128 /* public */ 129 lwres_uint32_t flags; 130 lwres_addr_t addr; 131 /* addr body follows */ 132} lwres_gnbarequest_t; 133 134typedef struct { 135 /* public */ 136 lwres_uint32_t flags; 137 lwres_uint16_t naliases; 138 lwres_uint16_t realnamelen; 139 /* aliases follows */ 140 /* realname follows */ 141} lwres_gnbaresponse_t; 142 143/* 144 * get rdata by name 145 */ 146#define LWRES_OPCODE_GETRDATABYNAME 0x00010003U 147 148typedef struct { 149 /* public */ 150 lwres_uint32_t flags; 151 lwres_uint16_t rdclass; 152 lwres_uint16_t rdtype; 153 lwres_uint16_t namelen; 154 /* name follows */ 155} lwres_grbnrequest_t; 156 157typedef struct { 158 /* public */ 159 lwres_uint32_t flags; 160 lwres_uint16_t rdclass; 161 lwres_uint16_t rdtype; 162 lwres_uint32_t ttl; 163 lwres_uint16_t nrdatas; 164 lwres_uint16_t nsigs; 165 /* realname here (len + name) */ 166 /* rdata here (len + name) */ 167 /* signatures here (len + name) */ 168} lwres_grbnresponse_t; 169 170#define LWRDATA_VALIDATED 0x00000001 171 172#define LWRES_ADDRTYPE_V4 0x00000001U /* ipv4 */ 173#define LWRES_ADDRTYPE_V6 0x00000002U /* ipv6 */ 174 175#define LWRES_MAX_ALIASES 16 /* max # of aliases */ 176#define LWRES_MAX_ADDRS 64 /* max # of addrs */ 177 178static const struct tok opcode[] = { 179 { LWRES_OPCODE_NOOP, "noop", }, 180 { LWRES_OPCODE_GETADDRSBYNAME, "getaddrsbyname", }, 181 { LWRES_OPCODE_GETNAMEBYADDR, "getnamebyaddr", }, 182 { LWRES_OPCODE_GETRDATABYNAME, "getrdatabyname", }, 183 { 0, NULL, }, 184}; 185 186/* print-domain.c */ 187extern const struct tok ns_type2str[]; 188extern const struct tok ns_class2str[]; 189 190static int lwres_printname(size_t, const char *); 191static int lwres_printnamelen(const char *); 192static int lwres_printbinlen(const char *); 193static int lwres_printaddr(lwres_addr_t *); 194 195static int 196lwres_printname(size_t l, const char *p0) 197{ 198 const char *p; 199 size_t i; 200 201 p = p0; 202 /* + 1 for terminating \0 */ 203 if (p + l + 1 > (const char *)snapend) 204 goto trunc; 205 206 printf(" "); 207 for (i = 0; i < l; i++) 208 safeputchar(*p++); 209 p++; /* skip terminating \0 */ 210 211 return p - p0; 212 213 trunc: 214 return -1; 215} 216 217static int 218lwres_printnamelen(const char *p) 219{ 220 u_int16_t l; 221 int advance; 222 223 if (p + 2 > (const char *)snapend) 224 goto trunc; 225 l = EXTRACT_16BITS(p); 226 advance = lwres_printname(l, p + 2); 227 if (advance < 0) 228 goto trunc; 229 return 2 + advance; 230 231 trunc: 232 return -1; 233} 234 235static int 236lwres_printbinlen(const char *p0) 237{ 238 const char *p; 239 u_int16_t l; 240 int i; 241 242 p = p0; 243 if (p + 2 > (const char *)snapend) 244 goto trunc; 245 l = EXTRACT_16BITS(p); 246 if (p + 2 + l > (const char *)snapend) 247 goto trunc; 248 p += 2; 249 for (i = 0; i < l; i++) 250 printf("%02x", *p++); 251 return p - p0; 252 253 trunc: 254 return -1; 255} 256 257static int 258lwres_printaddr(lwres_addr_t *ap) 259{ 260 u_int16_t l; 261 const char *p; 262 int i; 263 264 TCHECK(ap->length); 265 l = EXTRACT_16BITS(&ap->length); 266 /* XXX ap points to packed struct */ 267 p = (const char *)&ap->length + sizeof(ap->length); 268 TCHECK2(*p, l); 269 270 switch (EXTRACT_32BITS(&ap->family)) { 271 case 1: /* IPv4 */ 272 if (l < 4) 273 return -1; 274 printf(" %s", ipaddr_string(p)); 275 p += sizeof(struct in_addr); 276 break; 277#ifdef INET6 278 case 2: /* IPv6 */ 279 if (l < 16) 280 return -1; 281 printf(" %s", ip6addr_string(p)); 282 p += sizeof(struct in6_addr); 283 break; 284#endif 285 default: 286 printf(" %u/", EXTRACT_32BITS(&ap->family)); 287 for (i = 0; i < l; i++) 288 printf("%02x", *p++); 289 } 290 291 return p - (const char *)ap; 292 293 trunc: 294 return -1; 295} 296 297void 298lwres_print(register const u_char *bp, u_int length) 299{ 300 const struct lwres_lwpacket *np; 301 u_int32_t v; 302 const char *s; 303 int response; 304 int advance; 305 int unsupported = 0; 306 307 np = (const struct lwres_lwpacket *)bp; 308 TCHECK(np->authlength); 309 310 printf(" lwres"); 311 v = EXTRACT_16BITS(&np->version); 312 if (vflag || v != LWRES_LWPACKETVERSION_0) 313 printf(" v%u", v); 314 if (v != LWRES_LWPACKETVERSION_0) { 315 s = (const char *)np + EXTRACT_32BITS(&np->length); 316 goto tail; 317 } 318 319 response = EXTRACT_16BITS(&np->pktflags) & LWRES_LWPACKETFLAG_RESPONSE; 320 321 /* opcode and pktflags */ 322 v = EXTRACT_32BITS(&np->opcode); 323 s = tok2str(opcode, "#0x%x", v); 324 printf(" %s%s", s, response ? "" : "?"); 325 326 /* pktflags */ 327 v = EXTRACT_16BITS(&np->pktflags); 328 if (v & ~LWRES_LWPACKETFLAG_RESPONSE) 329 printf("[0x%x]", v); 330 331 if (vflag > 1) { 332 printf(" ("); /*)*/ 333 printf("serial:0x%x", EXTRACT_32BITS(&np->serial)); 334 printf(" result:0x%x", EXTRACT_32BITS(&np->result)); 335 printf(" recvlen:%u", EXTRACT_32BITS(&np->recvlength)); 336 /* BIND910: not used */ 337 if (vflag > 2) { 338 printf(" authtype:0x%x", EXTRACT_16BITS(&np->authtype)); 339 printf(" authlen:%u", EXTRACT_16BITS(&np->authlength)); 340 } 341 /*(*/ 342 printf(")"); 343 } 344 345 /* per-opcode content */ 346 if (!response) { 347 /* 348 * queries 349 */ 350 lwres_gabnrequest_t *gabn; 351 lwres_gnbarequest_t *gnba; 352 lwres_grbnrequest_t *grbn; 353 u_int32_t l; 354 355 gabn = NULL; 356 gnba = NULL; 357 grbn = NULL; 358 359 switch (EXTRACT_32BITS(&np->opcode)) { 360 case LWRES_OPCODE_NOOP: 361 break; 362 case LWRES_OPCODE_GETADDRSBYNAME: 363 gabn = (lwres_gabnrequest_t *)(np + 1); 364 TCHECK(gabn->namelen); 365 /* XXX gabn points to packed struct */ 366 s = (const char *)&gabn->namelen + 367 sizeof(gabn->namelen); 368 l = EXTRACT_16BITS(&gabn->namelen); 369 370 /* BIND910: not used */ 371 if (vflag > 2) { 372 printf(" flags:0x%x", 373 EXTRACT_32BITS(&gabn->flags)); 374 } 375 376 v = EXTRACT_32BITS(&gabn->addrtypes); 377 switch (v & (LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6)) { 378 case LWRES_ADDRTYPE_V4: 379 printf(" IPv4"); 380 break; 381 case LWRES_ADDRTYPE_V6: 382 printf(" IPv6"); 383 break; 384 case LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6: 385 printf(" IPv4/6"); 386 break; 387 } 388 if (v & ~(LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6)) 389 printf("[0x%x]", v); 390 391 advance = lwres_printname(l, s); 392 if (advance < 0) 393 goto trunc; 394 s += advance; 395 break; 396 case LWRES_OPCODE_GETNAMEBYADDR: 397 gnba = (lwres_gnbarequest_t *)(np + 1); 398 TCHECK(gnba->addr); 399 400 /* BIND910: not used */ 401 if (vflag > 2) { 402 printf(" flags:0x%x", 403 EXTRACT_32BITS(&gnba->flags)); 404 } 405 406 s = (const char *)&gnba->addr; 407 408 advance = lwres_printaddr(&gnba->addr); 409 if (advance < 0) 410 goto trunc; 411 s += advance; 412 break; 413 case LWRES_OPCODE_GETRDATABYNAME: 414 /* XXX no trace, not tested */ 415 grbn = (lwres_grbnrequest_t *)(np + 1); 416 TCHECK(grbn->namelen); 417 418 /* BIND910: not used */ 419 if (vflag > 2) { 420 printf(" flags:0x%x", 421 EXTRACT_32BITS(&grbn->flags)); 422 } 423 424 printf(" %s", tok2str(ns_type2str, "Type%d", 425 EXTRACT_16BITS(&grbn->rdtype))); 426 if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) { 427 printf(" %s", tok2str(ns_class2str, "Class%d", 428 EXTRACT_16BITS(&grbn->rdclass))); 429 } 430 431 /* XXX grbn points to packed struct */ 432 s = (const char *)&grbn->namelen + 433 sizeof(grbn->namelen); 434 l = EXTRACT_16BITS(&grbn->namelen); 435 436 advance = lwres_printname(l, s); 437 if (advance < 0) 438 goto trunc; 439 s += advance; 440 break; 441 default: 442 unsupported++; 443 break; 444 } 445 } else { 446 /* 447 * responses 448 */ 449 lwres_gabnresponse_t *gabn; 450 lwres_gnbaresponse_t *gnba; 451 lwres_grbnresponse_t *grbn; 452 u_int32_t l, na; 453 u_int32_t i; 454 455 gabn = NULL; 456 gnba = NULL; 457 grbn = NULL; 458 459 switch (EXTRACT_32BITS(&np->opcode)) { 460 case LWRES_OPCODE_NOOP: 461 break; 462 case LWRES_OPCODE_GETADDRSBYNAME: 463 gabn = (lwres_gabnresponse_t *)(np + 1); 464 TCHECK(gabn->realnamelen); 465 /* XXX gabn points to packed struct */ 466 s = (const char *)&gabn->realnamelen + 467 sizeof(gabn->realnamelen); 468 l = EXTRACT_16BITS(&gabn->realnamelen); 469 470 /* BIND910: not used */ 471 if (vflag > 2) { 472 printf(" flags:0x%x", 473 EXTRACT_32BITS(&gabn->flags)); 474 } 475 476 printf(" %u/%u", EXTRACT_16BITS(&gabn->naliases), 477 EXTRACT_16BITS(&gabn->naddrs)); 478 479 advance = lwres_printname(l, s); 480 if (advance < 0) 481 goto trunc; 482 s += advance; 483 484 /* aliases */ 485 na = EXTRACT_16BITS(&gabn->naliases); 486 for (i = 0; i < na; i++) { 487 advance = lwres_printnamelen(s); 488 if (advance < 0) 489 goto trunc; 490 s += advance; 491 } 492 493 /* addrs */ 494 na = EXTRACT_16BITS(&gabn->naddrs); 495 for (i = 0; i < na; i++) { 496 advance = lwres_printaddr((lwres_addr_t *)s); 497 if (advance < 0) 498 goto trunc; 499 s += advance; 500 } 501 break; 502 case LWRES_OPCODE_GETNAMEBYADDR: 503 gnba = (lwres_gnbaresponse_t *)(np + 1); 504 TCHECK(gnba->realnamelen); 505 /* XXX gnba points to packed struct */ 506 s = (const char *)&gnba->realnamelen + 507 sizeof(gnba->realnamelen); 508 l = EXTRACT_16BITS(&gnba->realnamelen); 509 510 /* BIND910: not used */ 511 if (vflag > 2) { 512 printf(" flags:0x%x", 513 EXTRACT_32BITS(&gnba->flags)); 514 } 515 516 printf(" %u", EXTRACT_16BITS(&gnba->naliases)); 517 518 advance = lwres_printname(l, s); 519 if (advance < 0) 520 goto trunc; 521 s += advance; 522 523 /* aliases */ 524 na = EXTRACT_16BITS(&gnba->naliases); 525 for (i = 0; i < na; i++) { 526 advance = lwres_printnamelen(s); 527 if (advance < 0) 528 goto trunc; 529 s += advance; 530 } 531 break; 532 case LWRES_OPCODE_GETRDATABYNAME: 533 /* XXX no trace, not tested */ 534 grbn = (lwres_grbnresponse_t *)(np + 1); 535 TCHECK(grbn->nsigs); 536 537 /* BIND910: not used */ 538 if (vflag > 2) { 539 printf(" flags:0x%x", 540 EXTRACT_32BITS(&grbn->flags)); 541 } 542 543 printf(" %s", tok2str(ns_type2str, "Type%d", 544 EXTRACT_16BITS(&grbn->rdtype))); 545 if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) { 546 printf(" %s", tok2str(ns_class2str, "Class%d", 547 EXTRACT_16BITS(&grbn->rdclass))); 548 } 549 printf(" TTL "); 550 relts_print(EXTRACT_32BITS(&grbn->ttl)); 551 printf(" %u/%u", EXTRACT_16BITS(&grbn->nrdatas), 552 EXTRACT_16BITS(&grbn->nsigs)); 553 554 /* XXX grbn points to packed struct */ 555 s = (const char *)&grbn->nsigs+ sizeof(grbn->nsigs); 556 557 advance = lwres_printnamelen(s); 558 if (advance < 0) 559 goto trunc; 560 s += advance; 561 562 /* rdatas */ 563 na = EXTRACT_16BITS(&grbn->nrdatas); 564 for (i = 0; i < na; i++) { 565 /* XXX should decode resource data */ 566 advance = lwres_printbinlen(s); 567 if (advance < 0) 568 goto trunc; 569 s += advance; 570 } 571 572 /* sigs */ 573 na = EXTRACT_16BITS(&grbn->nsigs); 574 for (i = 0; i < na; i++) { 575 /* XXX how should we print it? */ 576 advance = lwres_printbinlen(s); 577 if (advance < 0) 578 goto trunc; 579 s += advance; 580 } 581 break; 582 default: 583 unsupported++; 584 break; 585 } 586 } 587 588 tail: 589 /* length mismatch */ 590 if (EXTRACT_32BITS(&np->length) != length) { 591 printf(" [len: %u != %u]", EXTRACT_32BITS(&np->length), 592 length); 593 } 594 if (!unsupported && s < (const char *)np + EXTRACT_32BITS(&np->length)) 595 printf("[extra]"); 596 return; 597 598 trunc: 599 printf("[|lwres]"); 600 return; 601} 602