contrib/bind-9.5.2/lib/isccc/cc.c

   1 /*
   2  * Portions Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Portions Copyright (C) 2001-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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 AND NOMINUM DISCLAIMS ALL
  10  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  11  * OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY
  12  * 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 OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  *
  17  * Portions Copyright (C) 2001  Nominum, Inc.
  18  *
  19  * Permission to use, copy, modify, and/or distribute this software for any
  20  * purpose with or without fee is hereby granted, provided that the above
  21  * copyright notice and this permission notice appear in all copies.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
  24  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY
  26  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  27  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  28  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  29  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  30  */
  31
  32 /* $Id: cc.c,v 1.18 2007/08/28 07:20:43 tbox Exp $ */
  33
  34 /*! \file */
  35
  36 #include <config.h>
  37
  38 #include <stdio.h>
  39 #include <string.h>
  40 #include <errno.h>
  41
  42 #include <isc/assertions.h>
  43 #include <isc/hmacmd5.h>
  44 #include <isc/print.h>
  45 #include <isc/stdlib.h>
  46
  47 #include <isccc/alist.h>
  48 #include <isccc/base64.h>
  49 #include <isccc/cc.h>
  50 #include <isccc/result.h>
  51 #include <isccc/sexpr.h>
  52 #include <isccc/symtab.h>
  53 #include <isccc/symtype.h>
  54 #include <isccc/util.h>
  55
  56 #define MAX_TAGS                256
  57 #define DUP_LIFETIME            900
  58
  59 typedef isccc_sexpr_t *sexpr_ptr;
  60
  61 static unsigned char auth_hmd5[] = {
  62         0x05, 0x5f, 0x61, 0x75, 0x74, 0x68,             /*%< len + _auth */
  63         ISCCC_CCMSGTYPE_TABLE,                          /*%< message type */
  64         0x00, 0x00, 0x00, 0x20,                         /*%< length == 32 */
  65         0x04, 0x68, 0x6d, 0x64, 0x35,                   /*%< len + hmd5 */
  66         ISCCC_CCMSGTYPE_BINARYDATA,                     /*%< message type */
  67         0x00, 0x00, 0x00, 0x16,                         /*%< length == 22 */
  68         /*
  69          * The base64 encoding of one of our HMAC-MD5 signatures is
  70          * 22 bytes.
  71          */
  72         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  73         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  74         0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  75 };
  76
  77 #define HMD5_OFFSET     21              /*%< 21 = 6 + 1 + 4 + 5 + 1 + 4 */
  78 #define HMD5_LENGTH     22
  79
  80 static isc_result_t
  81 table_towire(isccc_sexpr_t *alist, isccc_region_t *target);
  82
  83 static isc_result_t
  84 list_towire(isccc_sexpr_t *alist, isccc_region_t *target);
  85
  86 static isc_result_t
  87 value_towire(isccc_sexpr_t *elt, isccc_region_t *target)
  88 {
  89         size_t len;
  90         unsigned char *lenp;
  91         isccc_region_t *vr;
  92         isc_result_t result;
  93
  94         if (isccc_sexpr_binaryp(elt)) {
  95                 vr = isccc_sexpr_tobinary(elt);
  96                 len = REGION_SIZE(*vr);
  97                 if (REGION_SIZE(*target) < 1 + 4 + len)
  98                         return (ISC_R_NOSPACE);
  99                 PUT8(ISCCC_CCMSGTYPE_BINARYDATA, target->rstart);
 100                 PUT32(len, target->rstart);
 101                 if (REGION_SIZE(*target) < len)
 102                         return (ISC_R_NOSPACE);
 103                 PUT_MEM(vr->rstart, len, target->rstart);
 104         } else if (isccc_alist_alistp(elt)) {
 105                 if (REGION_SIZE(*target) < 1 + 4)
 106                         return (ISC_R_NOSPACE);
 107                 PUT8(ISCCC_CCMSGTYPE_TABLE, target->rstart);
 108                 /*
 109                  * Emit a placeholder length.
 110                  */
 111                 lenp = target->rstart;
 112                 PUT32(0, target->rstart);
 113                 /*
 114                  * Emit the table.
 115                  */
 116                 result = table_towire(elt, target);
 117                 if (result != ISC_R_SUCCESS)
 118                         return (result);
 119                 len = (size_t)(target->rstart - lenp);
 120                 /*
 121                  * 'len' is 4 bytes too big, since it counts
 122                  * the placeholder length too.  Adjust and
 123                  * emit.
 124                  */
 125                 INSIST(len >= 4U);
 126                 len -= 4;
 127                 PUT32(len, lenp);
 128         } else if (isccc_sexpr_listp(elt)) {
 129                 if (REGION_SIZE(*target) < 1 + 4)
 130                         return (ISC_R_NOSPACE);
 131                 PUT8(ISCCC_CCMSGTYPE_LIST, target->rstart);
 132                 /*
 133                  * Emit a placeholder length and count.
 134                  */
 135                 lenp = target->rstart;
 136                 PUT32(0, target->rstart);
 137                 /*
 138                  * Emit the list.
 139                  */
 140                 result = list_towire(elt, target);
 141                 if (result != ISC_R_SUCCESS)
 142                         return (result);
 143                 len = (size_t)(target->rstart - lenp);
 144                 /*
 145                  * 'len' is 4 bytes too big, since it counts
 146                  * the placeholder length.  Adjust and emit.
 147                  */
 148                 INSIST(len >= 4U);
 149                 len -= 4;
 150                 PUT32(len, lenp);
 151         }
 152
 153         return (ISC_R_SUCCESS);
 154 }
 155
 156 static isc_result_t
 157 table_towire(isccc_sexpr_t *alist, isccc_region_t *target)
 158 {
 159         isccc_sexpr_t *kv, *elt, *k, *v;
 160         char *ks;
 161         isc_result_t result;
 162         size_t len;
 163
 164         for (elt = isccc_alist_first(alist);
 165              elt != NULL;
 166              elt = ISCCC_SEXPR_CDR(elt)) {
 167                 kv = ISCCC_SEXPR_CAR(elt);
 168                 k = ISCCC_SEXPR_CAR(kv);
 169                 ks = isccc_sexpr_tostring(k);
 170                 v = ISCCC_SEXPR_CDR(kv);
 171                 len = strlen(ks);
 172                 INSIST(len <= 255U);
 173                 /*
 174                  * Emit the key name.
 175                  */
 176                 if (REGION_SIZE(*target) < 1 + len)
 177                         return (ISC_R_NOSPACE);
 178                 PUT8(len, target->rstart);
 179                 PUT_MEM(ks, len, target->rstart);
 180                 /*
 181                  * Emit the value.
 182                  */
 183                 result = value_towire(v, target);
 184                 if (result != ISC_R_SUCCESS)
 185                         return (result);
 186         }
 187
 188         return (ISC_R_SUCCESS);
 189 }
 190
 191 static isc_result_t
 192 list_towire(isccc_sexpr_t *list, isccc_region_t *target)
 193 {
 194         isc_result_t result;
 195
 196         while (list != NULL) {
 197                 result = value_towire(ISCCC_SEXPR_CAR(list), target);
 198                 if (result != ISC_R_SUCCESS)
 199                         return (result);
 200                 list = ISCCC_SEXPR_CDR(list);
 201         }
 202
 203         return (ISC_R_SUCCESS);
 204 }
 205
 206 static isc_result_t
 207 sign(unsigned char *data, unsigned int length, unsigned char *hmd5,
 208      isccc_region_t *secret)
 209 {
 210         isc_hmacmd5_t ctx;
 211         isc_result_t result;
 212         isccc_region_t source, target;
 213         unsigned char digest[ISC_MD5_DIGESTLENGTH];
 214         unsigned char digestb64[ISC_MD5_DIGESTLENGTH * 4];
 215
 216         isc_hmacmd5_init(&ctx, secret->rstart, REGION_SIZE(*secret));
 217         isc_hmacmd5_update(&ctx, data, length);
 218         isc_hmacmd5_sign(&ctx, digest);
 219         source.rstart = digest;
 220         source.rend = digest + ISC_MD5_DIGESTLENGTH;
 221         target.rstart = digestb64;
 222         target.rend = digestb64 + ISC_MD5_DIGESTLENGTH * 4;
 223         result = isccc_base64_encode(&source, 64, "", &target);
 224         if (result != ISC_R_SUCCESS)
 225                 return (result);
 226         PUT_MEM(digestb64, HMD5_LENGTH, hmd5);
 227
 228         return (ISC_R_SUCCESS);
 229 }
 230
 231 isc_result_t
 232 isccc_cc_towire(isccc_sexpr_t *alist, isccc_region_t *target,
 233               isccc_region_t *secret)
 234 {
 235         unsigned char *hmd5_rstart, *signed_rstart;
 236         isc_result_t result;
 237
 238         if (REGION_SIZE(*target) < 4 + sizeof(auth_hmd5))
 239                 return (ISC_R_NOSPACE);
 240         /*
 241          * Emit protocol version.
 242          */
 243         PUT32(1, target->rstart);
 244         if (secret != NULL) {
 245                 /*
 246                  * Emit _auth section with zeroed HMAC-MD5 signature.
 247                  * We'll replace the zeros with the real signature once
 248                  * we know what it is.
 249                  */
 250                 hmd5_rstart = target->rstart + HMD5_OFFSET;
 251                 PUT_MEM(auth_hmd5, sizeof(auth_hmd5), target->rstart);
 252         } else
 253                 hmd5_rstart = NULL;
 254         signed_rstart = target->rstart;
 255         /*
 256          * Delete any existing _auth section so that we don't try
 257          * to encode it.
 258          */
 259         isccc_alist_delete(alist, "_auth");
 260         /*
 261          * Emit the message.
 262          */
 263         result = table_towire(alist, target);
 264         if (result != ISC_R_SUCCESS)
 265                 return (result);
 266         if (secret != NULL)
 267                 return (sign(signed_rstart, (target->rstart - signed_rstart),
 268                              hmd5_rstart, secret));
 269         return (ISC_R_SUCCESS);
 270 }
 271
 272 static isc_result_t
 273 verify(isccc_sexpr_t *alist, unsigned char *data, unsigned int length,
 274        isccc_region_t *secret)
 275 {
 276         isc_hmacmd5_t ctx;
 277         isccc_region_t source;
 278         isccc_region_t target;
 279         isc_result_t result;
 280         isccc_sexpr_t *_auth, *hmd5;
 281         unsigned char digest[ISC_MD5_DIGESTLENGTH];
 282         unsigned char digestb64[ISC_MD5_DIGESTLENGTH * 4];
 283
 284         /*
 285          * Extract digest.
 286          */
 287         _auth = isccc_alist_lookup(alist, "_auth");
 288         if (_auth == NULL)
 289                 return (ISC_R_FAILURE);
 290         hmd5 = isccc_alist_lookup(_auth, "hmd5");
 291         if (hmd5 == NULL)
 292                 return (ISC_R_FAILURE);
 293         /*
 294          * Compute digest.
 295          */
 296         isc_hmacmd5_init(&ctx, secret->rstart, REGION_SIZE(*secret));
 297         isc_hmacmd5_update(&ctx, data, length);
 298         isc_hmacmd5_sign(&ctx, digest);
 299         source.rstart = digest;
 300         source.rend = digest + ISC_MD5_DIGESTLENGTH;
 301         target.rstart = digestb64;
 302         target.rend = digestb64 + ISC_MD5_DIGESTLENGTH * 4;
 303         result = isccc_base64_encode(&source, 64, "", &target);
 304         if (result != ISC_R_SUCCESS)
 305                 return (result);
 306         /*
 307          * Strip trailing == and NUL terminate target.
 308          */
 309         target.rstart -= 2;
 310         *target.rstart++ = '\0';
 311         /*
 312          * Verify.
 313          */
 314         if (strcmp((char *)digestb64, isccc_sexpr_tostring(hmd5)) != 0)
 315                 return (ISCCC_R_BADAUTH);
 316
 317         return (ISC_R_SUCCESS);
 318 }
 319
 320 static isc_result_t
 321 table_fromwire(isccc_region_t *source, isccc_region_t *secret,
 322                isccc_sexpr_t **alistp);
 323
 324 static isc_result_t
 325 list_fromwire(isccc_region_t *source, isccc_sexpr_t **listp);
 326
 327 static isc_result_t
 328 value_fromwire(isccc_region_t *source, isccc_sexpr_t **valuep)
 329 {
 330         unsigned int msgtype;
 331         isc_uint32_t len;
 332         isccc_sexpr_t *value;
 333         isccc_region_t active;
 334         isc_result_t result;
 335
 336         if (REGION_SIZE(*source) < 1 + 4)
 337                 return (ISC_R_UNEXPECTEDEND);
 338         GET8(msgtype, source->rstart);
 339         GET32(len, source->rstart);
 340         if (REGION_SIZE(*source) < len)
 341                 return (ISC_R_UNEXPECTEDEND);
 342         active.rstart = source->rstart;
 343         active.rend = active.rstart + len;
 344         source->rstart = active.rend;
 345         if (msgtype == ISCCC_CCMSGTYPE_BINARYDATA) {
 346                 value = isccc_sexpr_frombinary(&active);
 347                 if (value != NULL) {
 348                         *valuep = value;
 349                         result = ISC_R_SUCCESS;
 350                 } else
 351                         result = ISC_R_NOMEMORY;
 352         } else if (msgtype == ISCCC_CCMSGTYPE_TABLE)
 353                 result = table_fromwire(&active, NULL, valuep);
 354         else if (msgtype == ISCCC_CCMSGTYPE_LIST)
 355                 result = list_fromwire(&active, valuep);
 356         else
 357                 result = ISCCC_R_SYNTAX;
 358
 359         return (result);
 360 }
 361
 362 static isc_result_t
 363 table_fromwire(isccc_region_t *source, isccc_region_t *secret,
 364                isccc_sexpr_t **alistp)
 365 {
 366         char key[256];
 367         isc_uint32_t len;
 368         isc_result_t result;
 369         isccc_sexpr_t *alist, *value;
 370         isc_boolean_t first_tag;
 371         unsigned char *checksum_rstart;
 372
 373         REQUIRE(alistp != NULL && *alistp == NULL);
 374
 375         checksum_rstart = NULL;
 376         first_tag = ISC_TRUE;
 377         alist = isccc_alist_create();
 378         if (alist == NULL)
 379                 return (ISC_R_NOMEMORY);
 380
 381         while (!REGION_EMPTY(*source)) {
 382                 GET8(len, source->rstart);
 383                 if (REGION_SIZE(*source) < len) {
 384                         result = ISC_R_UNEXPECTEDEND;
 385                         goto bad;
 386                 }
 387                 GET_MEM(key, len, source->rstart);
 388                 key[len] = '\0';        /* Ensure NUL termination. */
 389                 value = NULL;
 390                 result = value_fromwire(source, &value);
 391                 if (result != ISC_R_SUCCESS)
 392                         goto bad;
 393                 if (isccc_alist_define(alist, key, value) == NULL) {
 394                         result = ISC_R_NOMEMORY;
 395                         goto bad;
 396                 }
 397                 if (first_tag && secret != NULL && strcmp(key, "_auth") == 0)
 398                         checksum_rstart = source->rstart;
 399                 first_tag = ISC_FALSE;
 400         }
 401
 402         *alistp = alist;
 403
 404         if (secret != NULL) {
 405                 if (checksum_rstart != NULL)
 406                         return (verify(alist, checksum_rstart,
 407                                        (source->rend - checksum_rstart),
 408                                        secret));
 409                 return (ISCCC_R_BADAUTH);
 410         }
 411
 412         return (ISC_R_SUCCESS);
 413
 414  bad:
 415         isccc_sexpr_free(&alist);
 416
 417         return (result);
 418 }
 419
 420 static isc_result_t
 421 list_fromwire(isccc_region_t *source, isccc_sexpr_t **listp)
 422 {
 423         isccc_sexpr_t *list, *value;
 424         isc_result_t result;
 425
 426         list = NULL;
 427         while (!REGION_EMPTY(*source)) {
 428                 value = NULL;
 429                 result = value_fromwire(source, &value);
 430                 if (result != ISC_R_SUCCESS) {
 431                         isccc_sexpr_free(&list);
 432                         return (result);
 433                 }
 434                 if (isccc_sexpr_addtolist(&list, value) == NULL) {
 435                         isccc_sexpr_free(&value);
 436                         isccc_sexpr_free(&list);
 437                         return (result);
 438                 }
 439         }
 440
 441         *listp = list;
 442
 443         return (ISC_R_SUCCESS);
 444 }
 445
 446 isc_result_t
 447 isccc_cc_fromwire(isccc_region_t *source, isccc_sexpr_t **alistp,
 448                 isccc_region_t *secret)
 449 {
 450         unsigned int size;
 451         isc_uint32_t version;
 452
 453         size = REGION_SIZE(*source);
 454         if (size < 4)
 455                 return (ISC_R_UNEXPECTEDEND);
 456         GET32(version, source->rstart);
 457         if (version != 1)
 458                 return (ISCCC_R_UNKNOWNVERSION);
 459
 460         return (table_fromwire(source, secret, alistp));
 461 }
 462
 463 static isc_result_t
 464 createmessage(isc_uint32_t version, const char *from, const char *to,
 465               isc_uint32_t serial, isccc_time_t now,
 466               isccc_time_t expires, isccc_sexpr_t **alistp,
 467               isc_boolean_t want_expires)
 468 {
 469         isccc_sexpr_t *alist, *_ctrl, *_data;
 470         isc_result_t result;
 471
 472         REQUIRE(alistp != NULL && *alistp == NULL);
 473
 474         if (version != 1)
 475                 return (ISCCC_R_UNKNOWNVERSION);
 476
 477         alist = isccc_alist_create();
 478         if (alist == NULL)
 479                 return (ISC_R_NOMEMORY);
 480
 481         result = ISC_R_NOMEMORY;
 482
 483         _ctrl = isccc_alist_create();
 484         if (_ctrl == NULL)
 485                 goto bad;
 486         if (isccc_alist_define(alist, "_ctrl", _ctrl) == NULL) {
 487                 isccc_sexpr_free(&_ctrl);
 488                 goto bad;
 489         }
 490
 491         _data = isccc_alist_create();
 492         if (_data == NULL)
 493                 goto bad;
 494         if (isccc_alist_define(alist, "_data", _data) == NULL) {
 495                 isccc_sexpr_free(&_data);
 496                 goto bad;
 497         }
 498
 499         if (isccc_cc_defineuint32(_ctrl, "_ser", serial) == NULL ||
 500             isccc_cc_defineuint32(_ctrl, "_tim", now) == NULL ||
 501             (want_expires &&
 502              isccc_cc_defineuint32(_ctrl, "_exp", expires) == NULL))
 503                 goto bad;
 504         if (from != NULL &&
 505             isccc_cc_definestring(_ctrl, "_frm", from) == NULL)
 506                 goto bad;
 507         if (to != NULL &&
 508             isccc_cc_definestring(_ctrl, "_to", to) == NULL)
 509                 goto bad;
 510
 511         *alistp = alist;
 512
 513         return (ISC_R_SUCCESS);
 514
 515  bad:
 516         isccc_sexpr_free(&alist);
 517
 518         return (result);
 519 }
 520
 521 isc_result_t
 522 isccc_cc_createmessage(isc_uint32_t version, const char *from, const char *to,
 523                      isc_uint32_t serial, isccc_time_t now,
 524                      isccc_time_t expires, isccc_sexpr_t **alistp)
 525 {
 526         return (createmessage(version, from, to, serial, now, expires,
 527                               alistp, ISC_TRUE));
 528 }
 529
 530 isc_result_t
 531 isccc_cc_createack(isccc_sexpr_t *message, isc_boolean_t ok,
 532                  isccc_sexpr_t **ackp)
 533 {
 534         char *_frm, *_to;
 535         isc_uint32_t serial;
 536         isccc_sexpr_t *ack, *_ctrl;
 537         isc_result_t result;
 538         isccc_time_t t;
 539
 540         REQUIRE(ackp != NULL && *ackp == NULL);
 541
 542         _ctrl = isccc_alist_lookup(message, "_ctrl");
 543         if (_ctrl == NULL ||
 544             isccc_cc_lookupuint32(_ctrl, "_ser", &serial) != ISC_R_SUCCESS ||
 545             isccc_cc_lookupuint32(_ctrl, "_tim", &t) != ISC_R_SUCCESS)
 546                 return (ISC_R_FAILURE);
 547         /*
 548          * _frm and _to are optional.
 549          */
 550         _frm = NULL;
 551         (void)isccc_cc_lookupstring(_ctrl, "_frm", &_frm);
 552         _to = NULL;
 553         (void)isccc_cc_lookupstring(_ctrl, "_to", &_to);
 554         /*
 555          * Create the ack.
 556          */
 557         ack = NULL;
 558         result = createmessage(1, _to, _frm, serial, t, 0, &ack, ISC_FALSE);
 559         if (result != ISC_R_SUCCESS)
 560                 return (result);
 561
 562         _ctrl = isccc_alist_lookup(ack, "_ctrl");
 563         if (_ctrl == NULL)
 564                 return (ISC_R_FAILURE);
 565         if (isccc_cc_definestring(ack, "_ack", (ok) ? "1" : "0") == NULL) {
 566                 result = ISC_R_NOMEMORY;
 567                 goto bad;
 568         }
 569
 570         *ackp = ack;
 571
 572         return (ISC_R_SUCCESS);
 573
 574  bad:
 575         isccc_sexpr_free(&ack);
 576
 577         return (result);
 578 }
 579
 580 isc_boolean_t
 581 isccc_cc_isack(isccc_sexpr_t *message)
 582 {
 583         isccc_sexpr_t *_ctrl;
 584
 585         _ctrl = isccc_alist_lookup(message, "_ctrl");
 586         if (_ctrl == NULL)
 587                 return (ISC_FALSE);
 588         if (isccc_cc_lookupstring(_ctrl, "_ack", NULL) == ISC_R_SUCCESS)
 589                 return (ISC_TRUE);
 590         return (ISC_FALSE);
 591 }
 592
 593 isc_boolean_t
 594 isccc_cc_isreply(isccc_sexpr_t *message)
 595 {
 596         isccc_sexpr_t *_ctrl;
 597
 598         _ctrl = isccc_alist_lookup(message, "_ctrl");
 599         if (_ctrl == NULL)
 600                 return (ISC_FALSE);
 601         if (isccc_cc_lookupstring(_ctrl, "_rpl", NULL) == ISC_R_SUCCESS)
 602                 return (ISC_TRUE);
 603         return (ISC_FALSE);
 604 }
 605
 606 isc_result_t
 607 isccc_cc_createresponse(isccc_sexpr_t *message, isccc_time_t now,
 608                       isccc_time_t expires, isccc_sexpr_t **alistp)
 609 {
 610         char *_frm, *_to, *type;
 611         isc_uint32_t serial;
 612         isccc_sexpr_t *alist, *_ctrl, *_data;
 613         isc_result_t result;
 614
 615         REQUIRE(alistp != NULL && *alistp == NULL);
 616
 617         _ctrl = isccc_alist_lookup(message, "_ctrl");
 618         _data = isccc_alist_lookup(message, "_data");
 619         if (_ctrl == NULL ||
 620             _data == NULL ||
 621             isccc_cc_lookupuint32(_ctrl, "_ser", &serial) != ISC_R_SUCCESS ||
 622             isccc_cc_lookupstring(_data, "type", &type) != ISC_R_SUCCESS)
 623                 return (ISC_R_FAILURE);
 624         /*
 625          * _frm and _to are optional.
 626          */
 627         _frm = NULL;
 628         (void)isccc_cc_lookupstring(_ctrl, "_frm", &_frm);
 629         _to = NULL;
 630         (void)isccc_cc_lookupstring(_ctrl, "_to", &_to);
 631         /*
 632          * Create the response.
 633          */
 634         alist = NULL;
 635         result = isccc_cc_createmessage(1, _to, _frm, serial, now, expires,
 636                                          &alist);
 637         if (result != ISC_R_SUCCESS)
 638                 return (result);
 639         _ctrl = isccc_alist_lookup(alist, "_ctrl");
 640         if (_ctrl == NULL)
 641                 return (ISC_R_FAILURE);
 642         _data = isccc_alist_lookup(alist, "_data");
 643         if (_data == NULL)
 644                 return (ISC_R_FAILURE);
 645         if (isccc_cc_definestring(_ctrl, "_rpl", "1") == NULL ||
 646             isccc_cc_definestring(_data, "type", type) == NULL) {
 647                 isccc_sexpr_free(&alist);
 648                 return (ISC_R_NOMEMORY);
 649         }
 650
 651         *alistp = alist;
 652
 653         return (ISC_R_SUCCESS);
 654 }
 655
 656 isccc_sexpr_t *
 657 isccc_cc_definestring(isccc_sexpr_t *alist, const char *key, const char *str)
 658 {
 659         size_t len;
 660         isccc_region_t r;
 661
 662         len = strlen(str);
 663         DE_CONST(str, r.rstart);
 664         r.rend = r.rstart + len;
 665
 666         return (isccc_alist_definebinary(alist, key, &r));
 667 }
 668
 669 isccc_sexpr_t *
 670 isccc_cc_defineuint32(isccc_sexpr_t *alist, const char *key, isc_uint32_t i)
 671 {
 672         char b[100];
 673         size_t len;
 674         isccc_region_t r;
 675
 676         snprintf(b, sizeof(b), "%u", i);
 677         len = strlen(b);
 678         r.rstart = (unsigned char *)b;
 679         r.rend = (unsigned char *)b + len;
 680
 681         return (isccc_alist_definebinary(alist, key, &r));
 682 }
 683
 684 isc_result_t
 685 isccc_cc_lookupstring(isccc_sexpr_t *alist, const char *key, char **strp)
 686 {
 687         isccc_sexpr_t *kv, *v;
 688
 689         kv = isccc_alist_assq(alist, key);
 690         if (kv != NULL) {
 691                 v = ISCCC_SEXPR_CDR(kv);
 692                 if (isccc_sexpr_binaryp(v)) {
 693                         if (strp != NULL)
 694                                 *strp = isccc_sexpr_tostring(v);
 695                         return (ISC_R_SUCCESS);
 696                 } else
 697                         return (ISC_R_EXISTS);
 698         }
 699
 700         return (ISC_R_NOTFOUND);
 701 }
 702
 703 isc_result_t
 704 isccc_cc_lookupuint32(isccc_sexpr_t *alist, const char *key,
 705                        isc_uint32_t *uintp)
 706 {
 707         isccc_sexpr_t *kv, *v;
 708
 709         kv = isccc_alist_assq(alist, key);
 710         if (kv != NULL) {
 711                 v = ISCCC_SEXPR_CDR(kv);
 712                 if (isccc_sexpr_binaryp(v)) {
 713                         if (uintp != NULL)
 714                                 *uintp = (isc_uint32_t)
 715                                         strtoul(isccc_sexpr_tostring(v),
 716                                                 NULL, 10);
 717                         return (ISC_R_SUCCESS);
 718                 } else
 719                         return (ISC_R_EXISTS);
 720         }
 721
 722         return (ISC_R_NOTFOUND);
 723 }
 724
 725 static void
 726 symtab_undefine(char *key, unsigned int type, isccc_symvalue_t value,
 727                 void *arg)
 728 {
 729         UNUSED(type);
 730         UNUSED(value);
 731         UNUSED(arg);
 732
 733         free(key);
 734 }
 735
 736 static isc_boolean_t
 737 symtab_clean(char *key, unsigned int type, isccc_symvalue_t value,
 738              void *arg)
 739 {
 740         isccc_time_t *now;
 741
 742         UNUSED(key);
 743         UNUSED(type);
 744
 745         now = arg;
 746
 747         if (*now < value.as_uinteger)
 748                 return (ISC_FALSE);
 749         if ((*now - value.as_uinteger) < DUP_LIFETIME)
 750                 return (ISC_FALSE);
 751         return (ISC_TRUE);
 752 }
 753
 754 isc_result_t
 755 isccc_cc_createsymtab(isccc_symtab_t **symtabp)
 756 {
 757         return (isccc_symtab_create(11897, symtab_undefine, NULL, ISC_FALSE,
 758                                   symtabp));
 759 }
 760
 761 void
 762 isccc_cc_cleansymtab(isccc_symtab_t *symtab, isccc_time_t now)
 763 {
 764         isccc_symtab_foreach(symtab, symtab_clean, &now);
 765 }
 766
 767 static isc_boolean_t
 768 has_whitespace(const char *str)
 769 {
 770         char c;
 771
 772         if (str == NULL)
 773                 return (ISC_FALSE);
 774         while ((c = *str++) != '\0') {
 775                 if (c == ' ' || c == '\t' || c == '\n')
 776                         return (ISC_TRUE);
 777         }
 778         return (ISC_FALSE);
 779 }
 780
 781 isc_result_t
 782 isccc_cc_checkdup(isccc_symtab_t *symtab, isccc_sexpr_t *message,
 783                 isccc_time_t now)
 784 {
 785         const char *_frm;
 786         const char *_to;
 787         char *_ser, *_tim, *tmp;
 788         isc_result_t result;
 789         char *key;
 790         size_t len;
 791         isccc_symvalue_t value;
 792         isccc_sexpr_t *_ctrl;
 793
 794         _ctrl = isccc_alist_lookup(message, "_ctrl");
 795         if (_ctrl == NULL ||
 796             isccc_cc_lookupstring(_ctrl, "_ser", &_ser) != ISC_R_SUCCESS ||
 797             isccc_cc_lookupstring(_ctrl, "_tim", &_tim) != ISC_R_SUCCESS)
 798                 return (ISC_R_FAILURE);
 799         /*
 800          * _frm and _to are optional.
 801          */
 802         if (isccc_cc_lookupstring(_ctrl, "_frm", &tmp) != ISC_R_SUCCESS)
 803                 _frm = "";
 804         else
 805                 _frm = tmp;
 806         if (isccc_cc_lookupstring(_ctrl, "_to", &tmp) != ISC_R_SUCCESS)
 807                 _to = "";
 808         else
 809                 _to = tmp;
 810         /*
 811          * Ensure there is no newline in any of the strings.  This is so
 812          * we can write them to a file later.
 813          */
 814         if (has_whitespace(_frm) || has_whitespace(_to) ||
 815             has_whitespace(_ser) || has_whitespace(_tim))
 816                 return (ISC_R_FAILURE);
 817         len = strlen(_frm) + strlen(_to) + strlen(_ser) + strlen(_tim) + 4;
 818         key = malloc(len);
 819         if (key == NULL)
 820                 return (ISC_R_NOMEMORY);
 821         snprintf(key, len, "%s;%s;%s;%s", _frm, _to, _ser, _tim);
 822         value.as_uinteger = now;
 823         result = isccc_symtab_define(symtab, key, ISCCC_SYMTYPE_CCDUP, value,
 824                                    isccc_symexists_reject);
 825         if (result != ISC_R_SUCCESS) {
 826                 free(key);
 827                 return (result);
 828         }
 829
 830         return (ISC_R_SUCCESS);
 831 }