citadel/modules/imap/imap_search.c

   1 /*
   2  * Implements IMAP's gratuitously complex SEARCH command.
   3  *
   4  *
   5  * Copyright (c) 2001-2009 by the citadel.org team
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "ctdl_module.h"
  23
  24
  25 #include "sysdep.h"
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <signal.h>
  31 #include <pwd.h>
  32 #include <errno.h>
  33 #include <sys/types.h>
  34
  35 #if TIME_WITH_SYS_TIME
  36 # include <sys/time.h>
  37 # include <time.h>
  38 #else
  39 # if HAVE_SYS_TIME_H
  40 #  include <sys/time.h>
  41 # else
  42 #  include <time.h>
  43 # endif
  44 #endif
  45
  46 #include <sys/wait.h>
  47 #include <ctype.h>
  48 #include <string.h>
  49 #include <limits.h>
  50 #include <libcitadel.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "sysdep_decls.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "user_ops.h"
  58 #include "database.h"
  59 #include "msgbase.h"
  60 #include "internet_addressing.h"
  61 #include "imap_tools.h"
  62 #include "serv_imap.h"
  63 #include "imap_fetch.h"
  64 #include "imap_search.h"
  65 #include "genstamp.h"
  66
  67
  68 /*
  69  * imap_do_search() calls imap_do_search_msg() to search an individual
  70  * message after it has been fetched from the disk.  This function returns
  71  * nonzero if there is a match.
  72  *
  73  * supplied_msg MAY be used to pass a pointer to the message in memory,
  74  * if for some reason it's already been loaded.  If not, the message will
  75  * be loaded only if one or more search criteria require it.
  76  */
  77 int imap_do_search_msg(int seq, struct CtdlMessage *supplied_msg,
  78                         int num_items, ConstStr *itemlist, int is_uid) {
  79
  80         int match = 0;
  81         int is_not = 0;
  82         int is_or = 0;
  83         int pos = 0;
  84         int i;
  85         char *fieldptr;
  86         struct CtdlMessage *msg = NULL;
  87         int need_to_free_msg = 0;
  88
  89         if (num_items == 0) {
  90                 return(0);
  91         }
  92         msg = supplied_msg;
  93
  94         /* Initially we start at the beginning. */
  95         pos = 0;
  96
  97         /* Check for the dreaded NOT criterion. */
  98         if (!strcasecmp(itemlist[0].Key, "NOT")) {
  99                 is_not = 1;
 100                 pos = 1;
 101         }
 102
 103         /* Check for the dreaded OR criterion. */
 104         if (!strcasecmp(itemlist[0].Key, "OR")) {
 105                 is_or = 1;
 106                 pos = 1;
 107         }
 108
 109         /* Now look for criteria. */
 110         if (!strcasecmp(itemlist[pos].Key, "ALL")) {
 111                 match = 1;
 112                 ++pos;
 113         }
 114
 115         else if (!strcasecmp(itemlist[pos].Key, "ANSWERED")) {
 116                 if (IMAP->flags[seq-1] & IMAP_ANSWERED) {
 117                         match = 1;
 118                 }
 119                 ++pos;
 120         }
 121
 122         else if (!strcasecmp(itemlist[pos].Key, "BCC")) {
 123                 if (msg == NULL) {
 124                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 125                         need_to_free_msg = 1;
 126                 }
 127                 if (msg != NULL) {
 128                         fieldptr = rfc822_fetch_field(msg->cm_fields['M'], "Bcc");
 129                         if (fieldptr != NULL) {
 130                                 if (bmstrcasestr(fieldptr, itemlist[pos+1].Key)) {
 131                                         match = 1;
 132                                 }
 133                                 free(fieldptr);
 134                         }
 135                 }
 136                 pos += 2;
 137         }
 138
 139         else if (!strcasecmp(itemlist[pos].Key, "BEFORE")) {
 140                 if (msg == NULL) {
 141                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 142                         need_to_free_msg = 1;
 143                 }
 144                 if (msg != NULL) {
 145                         if (msg->cm_fields['T'] != NULL) {
 146                                 if (imap_datecmp(itemlist[pos+1].Key,
 147                                                 atol(msg->cm_fields['T'])) < 0) {
 148                                         match = 1;
 149                                 }
 150                         }
 151                 }
 152                 pos += 2;
 153         }
 154
 155         else if (!strcasecmp(itemlist[pos].Key, "BODY")) {
 156
 157                 /* If fulltext indexing is active, on this server,
 158                  *  all messages have already been qualified.
 159                  */
 160                 if (config.c_enable_fulltext) {
 161                         match = 1;
 162                 }
 163
 164                 /* Otherwise, we have to do a slow search. */
 165                 else {
 166                         if (msg == NULL) {
 167                                 msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 168                                 need_to_free_msg = 1;
 169                         }
 170                         if (msg != NULL) {
 171                                 if (bmstrcasestr(msg->cm_fields['M'], itemlist[pos+1].Key)) {
 172                                         match = 1;
 173                                 }
 174                         }
 175                 }
 176
 177                 pos += 2;
 178         }
 179
 180         else if (!strcasecmp(itemlist[pos].Key, "CC")) {
 181                 if (msg == NULL) {
 182                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 183                         need_to_free_msg = 1;
 184                 }
 185                 if (msg != NULL) {
 186                         fieldptr = msg->cm_fields['Y'];
 187                         if (fieldptr != NULL) {
 188                                 if (bmstrcasestr(fieldptr, itemlist[pos+1].Key)) {
 189                                         match = 1;
 190                                 }
 191                         }
 192                         else {
 193                                 fieldptr = rfc822_fetch_field(msg->cm_fields['M'], "Cc");
 194                                 if (fieldptr != NULL) {
 195                                         if (bmstrcasestr(fieldptr, itemlist[pos+1].Key)) {
 196                                                 match = 1;
 197                                         }
 198                                         free(fieldptr);
 199                                 }
 200                         }
 201                 }
 202                 pos += 2;
 203         }
 204
 205         else if (!strcasecmp(itemlist[pos].Key, "DELETED")) {
 206                 if (IMAP->flags[seq-1] & IMAP_DELETED) {
 207                         match = 1;
 208                 }
 209                 ++pos;
 210         }
 211
 212         else if (!strcasecmp(itemlist[pos].Key, "DRAFT")) {
 213                 if (IMAP->flags[seq-1] & IMAP_DRAFT) {
 214                         match = 1;
 215                 }
 216                 ++pos;
 217         }
 218
 219         else if (!strcasecmp(itemlist[pos].Key, "FLAGGED")) {
 220                 if (IMAP->flags[seq-1] & IMAP_FLAGGED) {
 221                         match = 1;
 222                 }
 223                 ++pos;
 224         }
 225
 226         else if (!strcasecmp(itemlist[pos].Key, "FROM")) {
 227                 if (msg == NULL) {
 228                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 229                         need_to_free_msg = 1;
 230                 }
 231                 if (msg != NULL) {
 232                         if (bmstrcasestr(msg->cm_fields['A'], itemlist[pos+1].Key)) {
 233                                 match = 1;
 234                         }
 235                         if (bmstrcasestr(msg->cm_fields['F'], itemlist[pos+1].Key)) {
 236                                 match = 1;
 237                         }
 238                 }
 239                 pos += 2;
 240         }
 241
 242         else if (!strcasecmp(itemlist[pos].Key, "HEADER")) {
 243
 244                 /* We've got to do a slow search for this because the client
 245                  * might be asking for an RFC822 header field that has not been
 246                  * converted into a Citadel header field.  That requires
 247                  * examining the message body.
 248                  */
 249                 if (msg == NULL) {
 250                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 251                         need_to_free_msg = 1;
 252                 }
 253
 254                 if (msg != NULL) {
 255
 256                         CC->redirect_buffer = NewStrBufPlain(NULL, SIZ);
 257                         CtdlOutputPreLoadedMsg(msg, MT_RFC822, HEADERS_FAST, 0, 1, 0);
 258
 259                         fieldptr = rfc822_fetch_field(ChrPtr(CC->redirect_buffer), itemlist[pos+1].Key);
 260                         if (fieldptr != NULL) {
 261                                 if (bmstrcasestr(fieldptr, itemlist[pos+2].Key)) {
 262                                         match = 1;
 263                                 }
 264                                 free(fieldptr);
 265                         }
 266
 267                         FreeStrBuf(&CC->redirect_buffer);
 268                 }
 269
 270                 pos += 3;       /* Yes, three */
 271         }
 272
 273         else if (!strcasecmp(itemlist[pos].Key, "KEYWORD")) {
 274                 /* not implemented */
 275                 pos += 2;
 276         }
 277
 278         else if (!strcasecmp(itemlist[pos].Key, "LARGER")) {
 279                 if (msg == NULL) {
 280                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 281                         need_to_free_msg = 1;
 282                 }
 283                 if (msg != NULL) {
 284                         if (strlen(msg->cm_fields['M']) > atoi(itemlist[pos+1].Key)) {
 285                                 match = 1;
 286                         }
 287                 }
 288                 pos += 2;
 289         }
 290
 291         else if (!strcasecmp(itemlist[pos].Key, "NEW")) {
 292                 if ( (IMAP->flags[seq-1] & IMAP_RECENT) && (!(IMAP->flags[seq-1] & IMAP_SEEN))) {
 293                         match = 1;
 294                 }
 295                 ++pos;
 296         }
 297
 298         else if (!strcasecmp(itemlist[pos].Key, "OLD")) {
 299                 if (!(IMAP->flags[seq-1] & IMAP_RECENT)) {
 300                         match = 1;
 301                 }
 302                 ++pos;
 303         }
 304
 305         else if (!strcasecmp(itemlist[pos].Key, "ON")) {
 306                 if (msg == NULL) {
 307                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 308                         need_to_free_msg = 1;
 309                 }
 310                 if (msg != NULL) {
 311                         if (msg->cm_fields['T'] != NULL) {
 312                                 if (imap_datecmp(itemlist[pos+1].Key,
 313                                                 atol(msg->cm_fields['T'])) == 0) {
 314                                         match = 1;
 315                                 }
 316                         }
 317                 }
 318                 pos += 2;
 319         }
 320
 321         else if (!strcasecmp(itemlist[pos].Key, "RECENT")) {
 322                 if (IMAP->flags[seq-1] & IMAP_RECENT) {
 323                         match = 1;
 324                 }
 325                 ++pos;
 326         }
 327
 328         else if (!strcasecmp(itemlist[pos].Key, "SEEN")) {
 329                 if (IMAP->flags[seq-1] & IMAP_SEEN) {
 330                         match = 1;
 331                 }
 332                 ++pos;
 333         }
 334
 335         else if (!strcasecmp(itemlist[pos].Key, "SENTBEFORE")) {
 336                 if (msg == NULL) {
 337                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 338                         need_to_free_msg = 1;
 339                 }
 340                 if (msg != NULL) {
 341                         if (msg->cm_fields['T'] != NULL) {
 342                                 if (imap_datecmp(itemlist[pos+1].Key,
 343                                                 atol(msg->cm_fields['T'])) < 0) {
 344                                         match = 1;
 345                                 }
 346                         }
 347                 }
 348                 pos += 2;
 349         }
 350
 351         else if (!strcasecmp(itemlist[pos].Key, "SENTON")) {
 352                 if (msg == NULL) {
 353                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 354                         need_to_free_msg = 1;
 355                 }
 356                 if (msg != NULL) {
 357                         if (msg->cm_fields['T'] != NULL) {
 358                                 if (imap_datecmp(itemlist[pos+1].Key,
 359                                                 atol(msg->cm_fields['T'])) == 0) {
 360                                         match = 1;
 361                                 }
 362                         }
 363                 }
 364                 pos += 2;
 365         }
 366
 367         else if (!strcasecmp(itemlist[pos].Key, "SENTSINCE")) {
 368                 if (msg == NULL) {
 369                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 370                         need_to_free_msg = 1;
 371                 }
 372                 if (msg != NULL) {
 373                         if (msg->cm_fields['T'] != NULL) {
 374                                 if (imap_datecmp(itemlist[pos+1].Key,
 375                                                 atol(msg->cm_fields['T'])) >= 0) {
 376                                         match = 1;
 377                                 }
 378                         }
 379                 }
 380                 pos += 2;
 381         }
 382
 383         else if (!strcasecmp(itemlist[pos].Key, "SINCE")) {
 384                 if (msg == NULL) {
 385                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 386                         need_to_free_msg = 1;
 387                 }
 388                 if (msg != NULL) {
 389                         if (msg->cm_fields['T'] != NULL) {
 390                                 if (imap_datecmp(itemlist[pos+1].Key,
 391                                                 atol(msg->cm_fields['T'])) >= 0) {
 392                                         match = 1;
 393                                 }
 394                         }
 395                 }
 396                 pos += 2;
 397         }
 398
 399         else if (!strcasecmp(itemlist[pos].Key, "SMALLER")) {
 400                 if (msg == NULL) {
 401                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 402                         need_to_free_msg = 1;
 403                 }
 404                 if (msg != NULL) {
 405                         if (strlen(msg->cm_fields['M']) < atoi(itemlist[pos+1].Key)) {
 406                                 match = 1;
 407                         }
 408                 }
 409                 pos += 2;
 410         }
 411
 412         else if (!strcasecmp(itemlist[pos].Key, "SUBJECT")) {
 413                 if (msg == NULL) {
 414                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 415                         need_to_free_msg = 1;
 416                 }
 417                 if (msg != NULL) {
 418                         if (bmstrcasestr(msg->cm_fields['U'], itemlist[pos+1].Key)) {
 419                                 match = 1;
 420                         }
 421                 }
 422                 pos += 2;
 423         }
 424
 425         else if (!strcasecmp(itemlist[pos].Key, "TEXT")) {
 426                 if (msg == NULL) {
 427                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 428                         need_to_free_msg = 1;
 429                 }
 430                 if (msg != NULL) {
 431                         for (i='A'; i<='Z'; ++i) {
 432                                 if (bmstrcasestr(msg->cm_fields[i], itemlist[pos+1].Key)) {
 433                                         match = 1;
 434                                 }
 435                         }
 436                 }
 437                 pos += 2;
 438         }
 439
 440         else if (!strcasecmp(itemlist[pos].Key, "TO")) {
 441                 if (msg == NULL) {
 442                         msg = CtdlFetchMessage(IMAP->msgids[seq-1], 1);
 443                         need_to_free_msg = 1;
 444                 }
 445                 if (msg != NULL) {
 446                         if (bmstrcasestr(msg->cm_fields['R'], itemlist[pos+1].Key)) {
 447                                 match = 1;
 448                         }
 449                 }
 450                 pos += 2;
 451         }
 452
 453         /* FIXME this is b0rken.  fix it. */
 454         else if (imap_is_message_set(itemlist[pos].Key)) {
 455                 if (is_msg_in_sequence_set(itemlist[pos].Key, seq)) {
 456                         match = 1;
 457                 }
 458                 pos += 1;
 459         }
 460
 461         /* FIXME this is b0rken.  fix it. */
 462         else if (!strcasecmp(itemlist[pos].Key, "UID")) {
 463                 if (is_msg_in_sequence_set(itemlist[pos+1].Key, IMAP->msgids[seq-1])) {
 464                         match = 1;
 465                 }
 466                 pos += 2;
 467         }
 468
 469         /* Now here come the 'UN' criteria.  Why oh why do we have to
 470          * implement *both* the 'UN' criteria *and* the 'NOT' keyword?  Why
 471          * can't there be *one* way to do things?  More gratuitous complexity.
 472          */
 473
 474         else if (!strcasecmp(itemlist[pos].Key, "UNANSWERED")) {
 475                 if ((IMAP->flags[seq-1] & IMAP_ANSWERED) == 0) {
 476                         match = 1;
 477                 }
 478                 ++pos;
 479         }
 480
 481         else if (!strcasecmp(itemlist[pos].Key, "UNDELETED")) {
 482                 if ((IMAP->flags[seq-1] & IMAP_DELETED) == 0) {
 483                         match = 1;
 484                 }
 485                 ++pos;
 486         }
 487
 488         else if (!strcasecmp(itemlist[pos].Key, "UNDRAFT")) {
 489                 if ((IMAP->flags[seq-1] & IMAP_DRAFT) == 0) {
 490                         match = 1;
 491                 }
 492                 ++pos;
 493         }
 494
 495         else if (!strcasecmp(itemlist[pos].Key, "UNFLAGGED")) {
 496                 if ((IMAP->flags[seq-1] & IMAP_FLAGGED) == 0) {
 497                         match = 1;
 498                 }
 499                 ++pos;
 500         }
 501
 502         else if (!strcasecmp(itemlist[pos].Key, "UNKEYWORD")) {
 503                 /* FIXME */
 504                 pos += 2;
 505         }
 506
 507         else if (!strcasecmp(itemlist[pos].Key, "UNSEEN")) {
 508                 if ((IMAP->flags[seq-1] & IMAP_SEEN) == 0) {
 509                         match = 1;
 510                 }
 511                 ++pos;
 512         }
 513
 514         /* Remember to negate if we were told to */
 515         if (is_not) {
 516                 match = !match;
 517         }
 518
 519         /* Keep going if there are more criteria! */
 520         if (pos < num_items) {
 521
 522                 if (is_or) {
 523                         match = (match || imap_do_search_msg(seq, msg,
 524                                 num_items - pos, &itemlist[pos], is_uid));
 525                 }
 526                 else {
 527                         match = (match && imap_do_search_msg(seq, msg,
 528                                 num_items - pos, &itemlist[pos], is_uid));
 529                 }
 530
 531         }
 532
 533         if (need_to_free_msg) {
 534                 CtdlFreeMessage(msg);
 535         }
 536         return(match);
 537 }
 538
 539
 540 /*
 541  * imap_search() calls imap_do_search() to do its actual work, once it's
 542  * validated and boiled down the request a bit.
 543  */
 544 void imap_do_search(int num_items, ConstStr *itemlist, int is_uid) {
 545         int i, j, k;
 546         int fts_num_msgs = 0;
 547         long *fts_msgs = NULL;
 548         int is_in_list = 0;
 549         int num_results = 0;
 550
 551         /* Strip parentheses.  We realize that this method will not work
 552          * in all cases, but it seems to work with all currently available
 553          * client software.  Revisit later...
 554          */
 555         for (i=0; i<num_items; ++i) {
 556                 if (itemlist[i].Key[0] == '(') {
 557
 558                         TokenCutLeft(&IMAP->Cmd,
 559                                      &itemlist[i],
 560                                      1);
 561                 }
 562                 if (itemlist[i].Key[itemlist[i].len-1] == ')') {
 563                         TokenCutRight(&IMAP->Cmd,
 564                                       &itemlist[i],
 565                                       1);
 566                 }
 567         }
 568
 569         /* If there is a BODY search criterion in the query, use our full
 570          * text index to disqualify messages that don't have any chance of
 571          * matching.  (Only do this if the index is enabled!!)
 572          */
 573         if (config.c_enable_fulltext) for (i=0; i<(num_items-1); ++i) {
 574                 if (!strcasecmp(itemlist[i].Key, "BODY")) {
 575                         CtdlModuleDoSearch(&fts_num_msgs, &fts_msgs, itemlist[i+1].Key, "fulltext");
 576                         if (fts_num_msgs > 0) {
 577                                 for (j=0; j < IMAP->num_msgs; ++j) {
 578                                         if (IMAP->flags[j] & IMAP_SELECTED) {
 579                                                 is_in_list = 0;
 580                                                 for (k=0; k<fts_num_msgs; ++k) {
 581                                                         if (IMAP->msgids[j] == fts_msgs[k]) {
 582                                                                 ++is_in_list;
 583                                                         }
 584                                                 }
 585                                         }
 586                                         if (!is_in_list) {
 587                                                 IMAP->flags[j] = IMAP->flags[j] & ~IMAP_SELECTED;
 588                                         }
 589                                 }
 590                         }
 591                         else {          /* no hits on the index; disqualify every message */
 592                                 for (j=0; j < IMAP->num_msgs; ++j) {
 593                                         IMAP->flags[j] = IMAP->flags[j] & ~IMAP_SELECTED;
 594                                 }
 595                         }
 596                         if (fts_msgs) {
 597                                 free(fts_msgs);
 598                         }
 599                 }
 600         }
 601
 602         /* Now go through the messages and apply all search criteria. */
 603         buffer_output();
 604         cprintf("* SEARCH ");
 605         if (IMAP->num_msgs > 0)
 606          for (i = 0; i < IMAP->num_msgs; ++i)
 607           if (IMAP->flags[i] & IMAP_SELECTED) {
 608                 if (imap_do_search_msg(i+1, NULL, num_items, itemlist, is_uid)) {
 609                         if (num_results != 0) {
 610                                 cprintf(" ");
 611                         }
 612                         if (is_uid) {
 613                                 cprintf("%ld", IMAP->msgids[i]);
 614                         }
 615                         else {
 616                                 cprintf("%d", i+1);
 617                         }
 618                         ++num_results;
 619                 }
 620         }
 621         cprintf("\r\n");
 622         unbuffer_output();
 623 }
 624
 625
 626 /*
 627  * This function is called by the main command loop.
 628  */
 629 void imap_search(int num_parms, ConstStr *Params) {
 630         int i;
 631
 632         if (num_parms < 3) {
 633                 cprintf("%s BAD invalid parameters\r\n", Params[0].Key);
 634                 return;
 635         }
 636
 637         for (i = 0; i < IMAP->num_msgs; ++i) {
 638                 IMAP->flags[i] |= IMAP_SELECTED;
 639         }
 640
 641         imap_do_search(num_parms-2, &Params[2], 0);
 642         cprintf("%s OK SEARCH completed\r\n", Params[0].Key);
 643 }
 644
 645 /*
 646  * This function is called by the main command loop.
 647  */
 648 void imap_uidsearch(int num_parms, ConstStr *Params) {
 649         int i;
 650
 651         if (num_parms < 4) {
 652                 cprintf("%s BAD invalid parameters\r\n", Params[0].Key);
 653                 return;
 654         }
 655
 656         for (i = 0; i < IMAP->num_msgs; ++i) {
 657                 IMAP->flags[i] |= IMAP_SELECTED;
 658         }
 659
 660         imap_do_search(num_parms-3, &Params[3], 1);
 661         cprintf("%s OK UID SEARCH completed\r\n", Params[0].Key);
 662 }
 663
 664