1 /* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1996-1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /*! \file 19 * \brief 20 * Based on the Dynamic DNS reference implementation by Viraj Bais 21 * <viraj_bais@ccm.fm.intel.com> 22 */ 23 24 #if !defined(lint) && !defined(SABER) 25 static const char rcsid[] = "$Id: res_mkupdate.c,v 1.8 2005/10/14 05:44:26 marka Exp $"; 26 #endif /* not lint */ 27 28 #include "port_before.h" 29 30 #include <sys/types.h> 31 #include <sys/param.h> 32 33 #include <netinet/in.h> 34 #include <arpa/nameser.h> 35 #include <arpa/inet.h> 36 37 #include <errno.h> 38 #include <limits.h> 39 #include <netdb.h> 40 #include <resolv.h> 41 #include <res_update.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <ctype.h> 47 48 #ifdef _LIBC 49 #include "isc/list.h" 50 #endif 51 #include "port_after.h" 52 53 /* Options. Leave them on. */ 54 #define DEBUG 55 #define MAXPORT 1024 56 57 static int getnum_str(u_char **, u_char *); 58 static int gethexnum_str(u_char **, u_char *); 59 static int getword_str(char *, int, u_char **, u_char *); 60 static int getstr_str(char *, int, u_char **, u_char *); 61 62 #define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2); 63 64 /* Forward. */ 65 #ifdef _LIBC 66 static 67 #endif 68 int res_protocolnumber(const char *); 69 #ifdef _LIBC 70 static 71 #endif 72 int res_servicenumber(const char *); 73 74 /*% 75 * Form update packets. 76 * Returns the size of the resulting packet if no error 77 * 78 * On error, 79 * returns 80 *\li -1 if error in reading a word/number in rdata 81 * portion for update packets 82 *\li -2 if length of buffer passed is insufficient 83 *\li -3 if zone section is not the first section in 84 * the linked list, or section order has a problem 85 *\li -4 on a number overflow 86 *\li -5 unknown operation or no records 87 */ 88 int 89 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) { 90 ns_updrec *rrecp_start = rrecp_in; 91 HEADER *hp; 92 u_char *cp, *sp2, *startp, *endp; 93 int n, i, soanum, multiline; 94 ns_updrec *rrecp; 95 struct in_addr ina; 96 struct in6_addr in6a; 97 char buf2[MAXDNAME]; 98 u_char buf3[MAXDNAME]; 99 int section, numrrs = 0, counts[ns_s_max]; 100 u_int16_t rtype, rclass; 101 u_int32_t n1, rttl; 102 u_char *dnptrs[20], **dpp, **lastdnptr; 103 #ifndef _LIBC 104 int siglen; 105 #endif 106 int keylen, certlen; 107 108 /* 109 * Initialize header fields. 110 */ 111 if ((buf == NULL) || (buflen < HFIXEDSZ)) 112 return (-1); 113 memset(buf, 0, HFIXEDSZ); 114 hp = (HEADER *) buf; 115 hp->id = htons(++statp->id); 116 hp->opcode = ns_o_update; 117 hp->rcode = NOERROR; 118 cp = buf + HFIXEDSZ; 119 buflen -= HFIXEDSZ; 120 dpp = dnptrs; 121 *dpp++ = buf; 122 *dpp++ = NULL; 123 lastdnptr = dnptrs + NELEM(dnptrs); 124 125 if (rrecp_start == NULL) 126 return (-5); 127 else if (rrecp_start->r_section != S_ZONE) 128 return (-3); 129 130 memset(counts, 0, sizeof counts); 131 for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) { 132 numrrs++; 133 section = rrecp->r_section; 134 if (section < 0 || section >= ns_s_max) 135 return (-1); 136 counts[section]++; 137 for (i = section + 1; i < ns_s_max; i++) 138 if (counts[i]) 139 return (-3); 140 rtype = rrecp->r_type; 141 rclass = rrecp->r_class; 142 rttl = rrecp->r_ttl; 143 /* overload class and type */ 144 if (section == S_PREREQ) { 145 rttl = 0; 146 switch (rrecp->r_opcode) { 147 case YXDOMAIN: 148 rclass = C_ANY; 149 rtype = T_ANY; 150 rrecp->r_size = 0; 151 break; 152 case NXDOMAIN: 153 rclass = C_NONE; 154 rtype = T_ANY; 155 rrecp->r_size = 0; 156 break; 157 case NXRRSET: 158 rclass = C_NONE; 159 rrecp->r_size = 0; 160 break; 161 case YXRRSET: 162 if (rrecp->r_size == 0) 163 rclass = C_ANY; 164 break; 165 default: 166 fprintf(stderr, 167 "res_mkupdate: incorrect opcode: %d\n", 168 rrecp->r_opcode); 169 fflush(stderr); 170 return (-1); 171 } 172 } else if (section == S_UPDATE) { 173 switch (rrecp->r_opcode) { 174 case DELETE: 175 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE; 176 break; 177 case ADD: 178 break; 179 default: 180 fprintf(stderr, 181 "res_mkupdate: incorrect opcode: %d\n", 182 rrecp->r_opcode); 183 fflush(stderr); 184 return (-1); 185 } 186 } 187 188 /* 189 * XXX appending default domain to owner name is omitted, 190 * fqdn must be provided 191 */ 192 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs, 193 lastdnptr)) < 0) 194 return (-1); 195 cp += n; 196 ShrinkBuffer(n + 2*INT16SZ); 197 PUTSHORT(rtype, cp); 198 PUTSHORT(rclass, cp); 199 if (section == S_ZONE) { 200 if (numrrs != 1 || rrecp->r_type != T_SOA) 201 return (-3); 202 continue; 203 } 204 ShrinkBuffer(INT32SZ + INT16SZ); 205 PUTLONG(rttl, cp); 206 sp2 = cp; /*%< save pointer to length byte */ 207 cp += INT16SZ; 208 if (rrecp->r_size == 0) { 209 if (section == S_UPDATE && rclass != C_ANY) 210 return (-1); 211 else { 212 PUTSHORT(0, sp2); 213 continue; 214 } 215 } 216 startp = rrecp->r_data; 217 endp = startp + rrecp->r_size - 1; 218 /* XXX this should be done centrally. */ 219 switch (rrecp->r_type) { 220 case T_A: 221 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 222 return (-1); 223 if (!inet_aton(buf2, &ina)) 224 return (-1); 225 n1 = ntohl(ina.s_addr); 226 ShrinkBuffer(INT32SZ); 227 PUTLONG(n1, cp); 228 break; 229 case T_CNAME: 230 case T_MB: 231 case T_MG: 232 case T_MR: 233 case T_NS: 234 case T_PTR: 235 case ns_t_dname: 236 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 237 return (-1); 238 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr); 239 if (n < 0) 240 return (-1); 241 cp += n; 242 ShrinkBuffer(n); 243 break; 244 case T_MINFO: 245 case T_SOA: 246 case T_RP: 247 for (i = 0; i < 2; i++) { 248 if (!getword_str(buf2, sizeof buf2, &startp, 249 endp)) 250 return (-1); 251 n = dn_comp(buf2, cp, buflen, 252 dnptrs, lastdnptr); 253 if (n < 0) 254 return (-1); 255 cp += n; 256 ShrinkBuffer(n); 257 } 258 if (rrecp->r_type == T_SOA) { 259 ShrinkBuffer(5 * INT32SZ); 260 while (isspace(*startp) || !*startp) 261 startp++; 262 if (*startp == '(') { 263 multiline = 1; 264 startp++; 265 } else 266 multiline = 0; 267 /* serial, refresh, retry, expire, minimum */ 268 for (i = 0; i < 5; i++) { 269 soanum = getnum_str(&startp, endp); 270 if (soanum < 0) 271 return (-1); 272 PUTLONG(soanum, cp); 273 } 274 if (multiline) { 275 while (isspace(*startp) || !*startp) 276 startp++; 277 if (*startp != ')') 278 return (-1); 279 } 280 } 281 break; 282 case T_MX: 283 case T_AFSDB: 284 case T_RT: 285 n = getnum_str(&startp, endp); 286 if (n < 0) 287 return (-1); 288 ShrinkBuffer(INT16SZ); 289 PUTSHORT(n, cp); 290 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 291 return (-1); 292 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr); 293 if (n < 0) 294 return (-1); 295 cp += n; 296 ShrinkBuffer(n); 297 break; 298 case T_SRV: 299 n = getnum_str(&startp, endp); 300 if (n < 0) 301 return (-1); 302 ShrinkBuffer(INT16SZ); 303 PUTSHORT(n, cp); 304 305 n = getnum_str(&startp, endp); 306 if (n < 0) 307 return (-1); 308 ShrinkBuffer(INT16SZ); 309 PUTSHORT(n, cp); 310 311 n = getnum_str(&startp, endp); 312 if (n < 0) 313 return (-1); 314 ShrinkBuffer(INT16SZ); 315 PUTSHORT(n, cp); 316 317 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 318 return (-1); 319 n = dn_comp(buf2, cp, buflen, NULL, NULL); 320 if (n < 0) 321 return (-1); 322 cp += n; 323 ShrinkBuffer(n); 324 break; 325 case T_PX: 326 n = getnum_str(&startp, endp); 327 if (n < 0) 328 return (-1); 329 PUTSHORT(n, cp); 330 ShrinkBuffer(INT16SZ); 331 for (i = 0; i < 2; i++) { 332 if (!getword_str(buf2, sizeof buf2, &startp, 333 endp)) 334 return (-1); 335 n = dn_comp(buf2, cp, buflen, dnptrs, 336 lastdnptr); 337 if (n < 0) 338 return (-1); 339 cp += n; 340 ShrinkBuffer(n); 341 } 342 break; 343 case T_WKS: { 344 char bm[MAXPORT/8]; 345 unsigned int maxbm = 0; 346 347 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 348 return (-1); 349 if (!inet_aton(buf2, &ina)) 350 return (-1); 351 n1 = ntohl(ina.s_addr); 352 ShrinkBuffer(INT32SZ); 353 PUTLONG(n1, cp); 354 355 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 356 return (-1); 357 if ((i = res_protocolnumber(buf2)) < 0) 358 return (-1); 359 ShrinkBuffer(1); 360 *cp++ = i & 0xff; 361 362 for (i = 0; i < MAXPORT/8 ; i++) 363 bm[i] = 0; 364 365 while (getword_str(buf2, sizeof buf2, &startp, endp)) { 366 if ((n = res_servicenumber(buf2)) <= 0) 367 return (-1); 368 369 if (n < MAXPORT) { 370 bm[n/8] |= (0x80>>(n%8)); 371 if ((unsigned)n > maxbm) 372 maxbm = n; 373 } else 374 return (-1); 375 } 376 maxbm = maxbm/8 + 1; 377 ShrinkBuffer(maxbm); 378 memcpy(cp, bm, maxbm); 379 cp += maxbm; 380 break; 381 } 382 case T_HINFO: 383 for (i = 0; i < 2; i++) { 384 if ((n = getstr_str(buf2, sizeof buf2, 385 &startp, endp)) < 0) 386 return (-1); 387 if (n > 255) 388 return (-1); 389 ShrinkBuffer(n+1); 390 *cp++ = n; 391 memcpy(cp, buf2, n); 392 cp += n; 393 } 394 break; 395 case T_TXT: 396 for (;;) { 397 if ((n = getstr_str(buf2, sizeof buf2, 398 &startp, endp)) < 0) { 399 if (cp != (sp2 + INT16SZ)) 400 break; 401 return (-1); 402 } 403 if (n > 255) 404 return (-1); 405 ShrinkBuffer(n+1); 406 *cp++ = n; 407 memcpy(cp, buf2, n); 408 cp += n; 409 } 410 break; 411 case T_X25: 412 /* RFC1183 */ 413 if ((n = getstr_str(buf2, sizeof buf2, &startp, 414 endp)) < 0) 415 return (-1); 416 if (n > 255) 417 return (-1); 418 ShrinkBuffer(n+1); 419 *cp++ = n; 420 memcpy(cp, buf2, n); 421 cp += n; 422 break; 423 case T_ISDN: 424 /* RFC1183 */ 425 if ((n = getstr_str(buf2, sizeof buf2, &startp, 426 endp)) < 0) 427 return (-1); 428 if ((n > 255) || (n == 0)) 429 return (-1); 430 ShrinkBuffer(n+1); 431 *cp++ = n; 432 memcpy(cp, buf2, n); 433 cp += n; 434 if ((n = getstr_str(buf2, sizeof buf2, &startp, 435 endp)) < 0) 436 n = 0; 437 if (n > 255) 438 return (-1); 439 ShrinkBuffer(n+1); 440 *cp++ = n; 441 memcpy(cp, buf2, n); 442 cp += n; 443 break; 444 case T_NSAP: 445 if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) { 446 ShrinkBuffer(n); 447 memcpy(cp, buf2, n); 448 cp += n; 449 } else { 450 return (-1); 451 } 452 break; 453 case T_LOC: 454 if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) { 455 ShrinkBuffer(n); 456 memcpy(cp, buf2, n); 457 cp += n; 458 } else 459 return (-1); 460 break; 461 case ns_t_sig: 462 #ifdef _LIBC 463 return (-1); 464 #else 465 { 466 int sig_type, success, dateerror; 467 u_int32_t exptime, timesigned; 468 469 /* type */ 470 if ((n = getword_str(buf2, sizeof buf2, 471 &startp, endp)) < 0) 472 return (-1); 473 sig_type = sym_ston(__p_type_syms, buf2, &success); 474 if (!success || sig_type == ns_t_any) 475 return (-1); 476 ShrinkBuffer(INT16SZ); 477 PUTSHORT(sig_type, cp); 478 /* alg */ 479 n = getnum_str(&startp, endp); 480 if (n < 0) 481 return (-1); 482 ShrinkBuffer(1); 483 *cp++ = n; 484 /* labels */ 485 n = getnum_str(&startp, endp); 486 if (n <= 0 || n > 255) 487 return (-1); 488 ShrinkBuffer(1); 489 *cp++ = n; 490 /* ottl & expire */ 491 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 492 return (-1); 493 exptime = ns_datetosecs(buf2, &dateerror); 494 if (!dateerror) { 495 ShrinkBuffer(INT32SZ); 496 PUTLONG(rttl, cp); 497 } 498 else { 499 char *ulendp; 500 u_int32_t ottl; 501 502 errno = 0; 503 ottl = strtoul(buf2, &ulendp, 10); 504 if (errno != 0 || 505 (ulendp != NULL && *ulendp != '\0')) 506 return (-1); 507 ShrinkBuffer(INT32SZ); 508 PUTLONG(ottl, cp); 509 if (!getword_str(buf2, sizeof buf2, &startp, 510 endp)) 511 return (-1); 512 exptime = ns_datetosecs(buf2, &dateerror); 513 if (dateerror) 514 return (-1); 515 } 516 /* expire */ 517 ShrinkBuffer(INT32SZ); 518 PUTLONG(exptime, cp); 519 /* timesigned */ 520 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 521 return (-1); 522 timesigned = ns_datetosecs(buf2, &dateerror); 523 if (!dateerror) { 524 ShrinkBuffer(INT32SZ); 525 PUTLONG(timesigned, cp); 526 } 527 else 528 return (-1); 529 /* footprint */ 530 n = getnum_str(&startp, endp); 531 if (n < 0) 532 return (-1); 533 ShrinkBuffer(INT16SZ); 534 PUTSHORT(n, cp); 535 /* signer name */ 536 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 537 return (-1); 538 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr); 539 if (n < 0) 540 return (-1); 541 cp += n; 542 ShrinkBuffer(n); 543 /* sig */ 544 if ((n = getword_str(buf2, sizeof buf2, 545 &startp, endp)) < 0) 546 return (-1); 547 siglen = b64_pton(buf2, buf3, sizeof(buf3)); 548 if (siglen < 0) 549 return (-1); 550 ShrinkBuffer(siglen); 551 memcpy(cp, buf3, siglen); 552 cp += siglen; 553 break; 554 } 555 #endif 556 case ns_t_key: 557 /* flags */ 558 n = gethexnum_str(&startp, endp); 559 if (n < 0) 560 return (-1); 561 ShrinkBuffer(INT16SZ); 562 PUTSHORT(n, cp); 563 /* proto */ 564 n = getnum_str(&startp, endp); 565 if (n < 0) 566 return (-1); 567 ShrinkBuffer(1); 568 *cp++ = n; 569 /* alg */ 570 n = getnum_str(&startp, endp); 571 if (n < 0) 572 return (-1); 573 ShrinkBuffer(1); 574 *cp++ = n; 575 /* key */ 576 if ((n = getword_str(buf2, sizeof buf2, 577 &startp, endp)) < 0) 578 return (-1); 579 keylen = b64_pton(buf2, buf3, sizeof(buf3)); 580 if (keylen < 0) 581 return (-1); 582 ShrinkBuffer(keylen); 583 memcpy(cp, buf3, keylen); 584 cp += keylen; 585 break; 586 case ns_t_nxt: 587 { 588 int success, nxt_type; 589 u_char data[32]; 590 int maxtype; 591 592 /* next name */ 593 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 594 return (-1); 595 n = dn_comp(buf2, cp, buflen, NULL, NULL); 596 if (n < 0) 597 return (-1); 598 cp += n; 599 ShrinkBuffer(n); 600 maxtype = 0; 601 memset(data, 0, sizeof data); 602 for (;;) { 603 if (!getword_str(buf2, sizeof buf2, &startp, 604 endp)) 605 break; 606 nxt_type = sym_ston(__p_type_syms, buf2, 607 &success); 608 if (!success || !ns_t_rr_p(nxt_type)) 609 return (-1); 610 NS_NXT_BIT_SET(nxt_type, data); 611 if (nxt_type > maxtype) 612 maxtype = nxt_type; 613 } 614 n = maxtype/NS_NXT_BITS+1; 615 ShrinkBuffer(n); 616 memcpy(cp, data, n); 617 cp += n; 618 break; 619 } 620 case ns_t_cert: 621 /* type */ 622 n = getnum_str(&startp, endp); 623 if (n < 0) 624 return (-1); 625 ShrinkBuffer(INT16SZ); 626 PUTSHORT(n, cp); 627 /* key tag */ 628 n = getnum_str(&startp, endp); 629 if (n < 0) 630 return (-1); 631 ShrinkBuffer(INT16SZ); 632 PUTSHORT(n, cp); 633 /* alg */ 634 n = getnum_str(&startp, endp); 635 if (n < 0) 636 return (-1); 637 ShrinkBuffer(1); 638 *cp++ = n; 639 /* cert */ 640 if ((n = getword_str(buf2, sizeof buf2, 641 &startp, endp)) < 0) 642 return (-1); 643 certlen = b64_pton(buf2, buf3, sizeof(buf3)); 644 if (certlen < 0) 645 return (-1); 646 ShrinkBuffer(certlen); 647 memcpy(cp, buf3, certlen); 648 cp += certlen; 649 break; 650 case ns_t_aaaa: 651 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 652 return (-1); 653 if (inet_pton(AF_INET6, buf2, &in6a) <= 0) 654 return (-1); 655 ShrinkBuffer(NS_IN6ADDRSZ); 656 memcpy(cp, &in6a, NS_IN6ADDRSZ); 657 cp += NS_IN6ADDRSZ; 658 break; 659 case ns_t_naptr: 660 /* Order Preference Flags Service Replacement Regexp */ 661 /* Order */ 662 n = getnum_str(&startp, endp); 663 if (n < 0 || n > 65535) 664 return (-1); 665 ShrinkBuffer(INT16SZ); 666 PUTSHORT(n, cp); 667 /* Preference */ 668 n = getnum_str(&startp, endp); 669 if (n < 0 || n > 65535) 670 return (-1); 671 ShrinkBuffer(INT16SZ); 672 PUTSHORT(n, cp); 673 /* Flags */ 674 if ((n = getstr_str(buf2, sizeof buf2, 675 &startp, endp)) < 0) { 676 return (-1); 677 } 678 if (n > 255) 679 return (-1); 680 ShrinkBuffer(n+1); 681 *cp++ = n; 682 memcpy(cp, buf2, n); 683 cp += n; 684 /* Service Classes */ 685 if ((n = getstr_str(buf2, sizeof buf2, 686 &startp, endp)) < 0) { 687 return (-1); 688 } 689 if (n > 255) 690 return (-1); 691 ShrinkBuffer(n+1); 692 *cp++ = n; 693 memcpy(cp, buf2, n); 694 cp += n; 695 /* Pattern */ 696 if ((n = getstr_str(buf2, sizeof buf2, 697 &startp, endp)) < 0) { 698 return (-1); 699 } 700 if (n > 255) 701 return (-1); 702 ShrinkBuffer(n+1); 703 *cp++ = n; 704 memcpy(cp, buf2, n); 705 cp += n; 706 /* Replacement */ 707 if (!getword_str(buf2, sizeof buf2, &startp, endp)) 708 return (-1); 709 n = dn_comp(buf2, cp, buflen, NULL, NULL); 710 if (n < 0) 711 return (-1); 712 cp += n; 713 ShrinkBuffer(n); 714 break; 715 default: 716 return (-1); 717 } /*switch*/ 718 n = (u_int16_t)((cp - sp2) - INT16SZ); 719 PUTSHORT(n, sp2); 720 } /*for*/ 721 722 hp->qdcount = htons(counts[0]); 723 hp->ancount = htons(counts[1]); 724 hp->nscount = htons(counts[2]); 725 hp->arcount = htons(counts[3]); 726 return (cp - buf); 727 } 728 729 /*% 730 * Get a whitespace delimited word from a string (not file) 731 * into buf. modify the start pointer to point after the 732 * word in the string. 733 */ 734 static int 735 getword_str(char *buf, int size, u_char **startpp, u_char *endp) { 736 char *cp; 737 int c; 738 739 for (cp = buf; *startpp <= endp; ) { 740 c = **startpp; 741 if (isspace(c) || c == '\0') { 742 if (cp != buf) /*%< trailing whitespace */ 743 break; 744 else { /*%< leading whitespace */ 745 (*startpp)++; 746 continue; 747 } 748 } 749 (*startpp)++; 750 if (cp >= buf+size-1) 751 break; 752 *cp++ = (u_char)c; 753 } 754 *cp = '\0'; 755 return (cp != buf); 756 } 757 758 /*% 759 * get a white spae delimited string from memory. Process quoted strings 760 * and \\DDD escapes. Return length or -1 on error. Returned string may 761 * contain nulls. 762 */ 763 static char digits[] = "0123456789"; 764 static int 765 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) { 766 char *cp; 767 int c, c1 = 0; 768 int inquote = 0; 769 int seen_quote = 0; 770 int escape = 0; 771 int dig = 0; 772 773 for (cp = buf; *startpp <= endp; ) { 774 if ((c = **startpp) == '\0') 775 break; 776 /* leading white space */ 777 if ((cp == buf) && !seen_quote && isspace(c)) { 778 (*startpp)++; 779 continue; 780 } 781 782 switch (c) { 783 case '\\': 784 if (!escape) { 785 escape = 1; 786 dig = 0; 787 c1 = 0; 788 (*startpp)++; 789 continue; 790 } 791 goto do_escape; 792 case '"': 793 if (!escape) { 794 inquote = !inquote; 795 seen_quote = 1; 796 (*startpp)++; 797 continue; 798 } 799 /* fall through */ 800 default: 801 do_escape: 802 if (escape) { 803 switch (c) { 804 case '0': 805 case '1': 806 case '2': 807 case '3': 808 case '4': 809 case '5': 810 case '6': 811 case '7': 812 case '8': 813 case '9': 814 c1 = c1 * 10 + 815 (strchr(digits, c) - digits); 816 817 if (++dig == 3) { 818 c = c1 &0xff; 819 break; 820 } 821 (*startpp)++; 822 continue; 823 } 824 escape = 0; 825 } else if (!inquote && isspace(c)) 826 goto done; 827 if (cp >= buf+size-1) 828 goto done; 829 *cp++ = (u_char)c; 830 (*startpp)++; 831 } 832 } 833 done: 834 *cp = '\0'; 835 return ((cp == buf)? (seen_quote? 0: -1): (cp - buf)); 836 } 837 838 /*% 839 * Get a whitespace delimited base 16 number from a string (not file) into buf 840 * update the start pointer to point after the number in the string. 841 */ 842 static int 843 gethexnum_str(u_char **startpp, u_char *endp) { 844 int c, n; 845 int seendigit = 0; 846 int m = 0; 847 848 if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0) 849 return getnum_str(startpp, endp); 850 (*startpp)+=2; 851 for (n = 0; *startpp <= endp; ) { 852 c = **startpp; 853 if (isspace(c) || c == '\0') { 854 if (seendigit) /*%< trailing whitespace */ 855 break; 856 else { /*%< leading whitespace */ 857 (*startpp)++; 858 continue; 859 } 860 } 861 if (c == ';') { 862 while ((*startpp <= endp) && 863 ((c = **startpp) != '\n')) 864 (*startpp)++; 865 if (seendigit) 866 break; 867 continue; 868 } 869 if (!isxdigit(c)) { 870 if (c == ')' && seendigit) { 871 (*startpp)--; 872 break; 873 } 874 return (-1); 875 } 876 (*startpp)++; 877 if (isdigit(c)) 878 n = n * 16 + (c - '0'); 879 else 880 n = n * 16 + (tolower(c) - 'a' + 10); 881 seendigit = 1; 882 } 883 return (n + m); 884 } 885 886 /*% 887 * Get a whitespace delimited base 10 number from a string (not file) into buf 888 * update the start pointer to point after the number in the string. 889 */ 890 static int 891 getnum_str(u_char **startpp, u_char *endp) { 892 int c, n; 893 int seendigit = 0; 894 int m = 0; 895 896 for (n = 0; *startpp <= endp; ) { 897 c = **startpp; 898 if (isspace(c) || c == '\0') { 899 if (seendigit) /*%< trailing whitespace */ 900 break; 901 else { /*%< leading whitespace */ 902 (*startpp)++; 903 continue; 904 } 905 } 906 if (c == ';') { 907 while ((*startpp <= endp) && 908 ((c = **startpp) != '\n')) 909 (*startpp)++; 910 if (seendigit) 911 break; 912 continue; 913 } 914 if (!isdigit(c)) { 915 if (c == ')' && seendigit) { 916 (*startpp)--; 917 break; 918 } 919 return (-1); 920 } 921 (*startpp)++; 922 n = n * 10 + (c - '0'); 923 seendigit = 1; 924 } 925 return (n + m); 926 } 927 928 /*% 929 * Allocate a resource record buffer & save rr info. 930 */ 931 ns_updrec * 932 res_mkupdrec(int section, const char *dname, 933 u_int class, u_int type, u_long ttl) { 934 ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec)); 935 936 if (!rrecp || !(rrecp->r_dname = strdup(dname))) { 937 if (rrecp) 938 free((char *)rrecp); 939 return (NULL); 940 } 941 INIT_LINK(rrecp, r_link); 942 INIT_LINK(rrecp, r_glink); 943 rrecp->r_class = (ns_class)class; 944 rrecp->r_type = (ns_type)type; 945 rrecp->r_ttl = ttl; 946 rrecp->r_section = (ns_sect)section; 947 return (rrecp); 948 } 949 950 /*% 951 * Free a resource record buffer created by res_mkupdrec. 952 */ 953 void 954 res_freeupdrec(ns_updrec *rrecp) { 955 /* Note: freeing r_dp is the caller's responsibility. */ 956 if (rrecp->r_dname != NULL) 957 free(rrecp->r_dname); 958 free(rrecp); 959 } 960 961 struct valuelist { 962 struct valuelist * next; 963 struct valuelist * prev; 964 char * name; 965 char * proto; 966 int port; 967 }; 968 static struct valuelist *servicelist, *protolist; 969 970 static void 971 res_buildservicelist(void) { 972 struct servent *sp; 973 struct valuelist *slp; 974 975 #ifdef MAYBE_HESIOD 976 setservent(0); 977 #else 978 setservent(1); 979 #endif 980 while ((sp = getservent()) != NULL) { 981 slp = (struct valuelist *)malloc(sizeof(struct valuelist)); 982 if (!slp) 983 break; 984 slp->name = strdup(sp->s_name); 985 slp->proto = strdup(sp->s_proto); 986 if ((slp->name == NULL) || (slp->proto == NULL)) { 987 if (slp->name) free(slp->name); 988 if (slp->proto) free(slp->proto); 989 free(slp); 990 break; 991 } 992 slp->port = ntohs((u_int16_t)sp->s_port); /*%< host byt order */ 993 slp->next = servicelist; 994 slp->prev = NULL; 995 if (servicelist) 996 servicelist->prev = slp; 997 servicelist = slp; 998 } 999 endservent(); 1000 } 1001 1002 #ifndef _LIBC 1003 void 1004 res_destroyservicelist() { 1005 struct valuelist *slp, *slp_next; 1006 1007 for (slp = servicelist; slp != NULL; slp = slp_next) { 1008 slp_next = slp->next; 1009 free(slp->name); 1010 free(slp->proto); 1011 free(slp); 1012 } 1013 servicelist = (struct valuelist *)0; 1014 } 1015 #endif 1016 1017 void 1018 res_buildprotolist(void) { 1019 struct protoent *pp; 1020 struct valuelist *slp; 1021 1022 #ifdef MAYBE_HESIOD 1023 setprotoent(0); 1024 #else 1025 setprotoent(1); 1026 #endif 1027 while ((pp = getprotoent()) != NULL) { 1028 slp = (struct valuelist *)malloc(sizeof(struct valuelist)); 1029 if (!slp) 1030 break; 1031 slp->name = strdup(pp->p_name); 1032 if (slp->name == NULL) { 1033 free(slp); 1034 break; 1035 } 1036 slp->port = pp->p_proto; /*%< host byte order */ 1037 slp->next = protolist; 1038 slp->prev = NULL; 1039 if (protolist) 1040 protolist->prev = slp; 1041 protolist = slp; 1042 } 1043 endprotoent(); 1044 } 1045 1046 #ifndef _LIBC 1047 void 1048 res_destroyprotolist(void) { 1049 struct valuelist *plp, *plp_next; 1050 1051 for (plp = protolist; plp != NULL; plp = plp_next) { 1052 plp_next = plp->next; 1053 free(plp->name); 1054 free(plp); 1055 } 1056 protolist = (struct valuelist *)0; 1057 } 1058 #endif 1059 1060 static int 1061 findservice(const char *s, struct valuelist **list) { 1062 struct valuelist *lp = *list; 1063 int n; 1064 1065 for (; lp != NULL; lp = lp->next) 1066 if (strcasecmp(lp->name, s) == 0) { 1067 if (lp != *list) { 1068 lp->prev->next = lp->next; 1069 if (lp->next) 1070 lp->next->prev = lp->prev; 1071 (*list)->prev = lp; 1072 lp->next = *list; 1073 *list = lp; 1074 } 1075 return (lp->port); /*%< host byte order */ 1076 } 1077 if (sscanf(s, "%d", &n) != 1 || n <= 0) 1078 n = -1; 1079 return (n); 1080 } 1081 1082 /*% 1083 * Convert service name or (ascii) number to int. 1084 */ 1085 #ifdef _LIBC 1086 static 1087 #endif 1088 int 1089 res_servicenumber(const char *p) { 1090 if (servicelist == (struct valuelist *)0) 1091 res_buildservicelist(); 1092 return (findservice(p, &servicelist)); 1093 } 1094 1095 /*% 1096 * Convert protocol name or (ascii) number to int. 1097 */ 1098 #ifdef _LIBC 1099 static 1100 #endif 1101 int 1102 res_protocolnumber(const char *p) { 1103 if (protolist == (struct valuelist *)0) 1104 res_buildprotolist(); 1105 return (findservice(p, &protolist)); 1106 } 1107 1108 #ifndef _LIBC 1109 static struct servent * 1110 cgetservbyport(u_int16_t port, const char *proto) { /*%< Host byte order. */ 1111 struct valuelist **list = &servicelist; 1112 struct valuelist *lp = *list; 1113 static struct servent serv; 1114 1115 port = ntohs(port); 1116 for (; lp != NULL; lp = lp->next) { 1117 if (port != (u_int16_t)lp->port) /*%< Host byte order. */ 1118 continue; 1119 if (strcasecmp(lp->proto, proto) == 0) { 1120 if (lp != *list) { 1121 lp->prev->next = lp->next; 1122 if (lp->next) 1123 lp->next->prev = lp->prev; 1124 (*list)->prev = lp; 1125 lp->next = *list; 1126 *list = lp; 1127 } 1128 serv.s_name = lp->name; 1129 serv.s_port = htons((u_int16_t)lp->port); 1130 serv.s_proto = lp->proto; 1131 return (&serv); 1132 } 1133 } 1134 return (0); 1135 } 1136 1137 static struct protoent * 1138 cgetprotobynumber(int proto) { /*%< Host byte order. */ 1139 struct valuelist **list = &protolist; 1140 struct valuelist *lp = *list; 1141 static struct protoent prot; 1142 1143 for (; lp != NULL; lp = lp->next) 1144 if (lp->port == proto) { /*%< Host byte order. */ 1145 if (lp != *list) { 1146 lp->prev->next = lp->next; 1147 if (lp->next) 1148 lp->next->prev = lp->prev; 1149 (*list)->prev = lp; 1150 lp->next = *list; 1151 *list = lp; 1152 } 1153 prot.p_name = lp->name; 1154 prot.p_proto = lp->port; /*%< Host byte order. */ 1155 return (&prot); 1156 } 1157 return (0); 1158 } 1159 1160 const char * 1161 res_protocolname(int num) { 1162 static char number[8]; 1163 struct protoent *pp; 1164 1165 if (protolist == (struct valuelist *)0) 1166 res_buildprotolist(); 1167 pp = cgetprotobynumber(num); 1168 if (pp == NULL) { 1169 (void) sprintf(number, "%d", num); 1170 return (number); 1171 } 1172 return (pp->p_name); 1173 } 1174 1175 const char * 1176 res_servicename(u_int16_t port, const char *proto) { /*%< Host byte order. */ 1177 static char number[8]; 1178 struct servent *ss; 1179 1180 if (servicelist == (struct valuelist *)0) 1181 res_buildservicelist(); 1182 ss = cgetservbyport(htons(port), proto); 1183 if (ss == NULL) { 1184 (void) sprintf(number, "%d", port); 1185 return (number); 1186 } 1187 return (ss->s_name); 1188 } 1189 #endif /* !_LIBC */ 1190