citadel/modules/wiki/serv_wiki.c

   1 /*
   2  * Server-side module for Wiki rooms.  This handles things like version control.
   3  *
   4  * Copyright (c) 2009-2012 by the citadel.org team
   5  *
   6  * This program is open source software.  You can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License, version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <signal.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <ctype.h>
  24 #include <sys/types.h>
  25
  26 #if TIME_WITH_SYS_TIME
  27 # include <sys/time.h>
  28 # include <time.h>
  29 #else
  30 # if HAVE_SYS_TIME_H
  31 #  include <sys/time.h>
  32 # else
  33 #  include <time.h>
  34 # endif
  35 #endif
  36
  37 #include <sys/wait.h>
  38 #include <string.h>
  39 #include <limits.h>
  40 #include <libcitadel.h>
  41 #include "citadel.h"
  42 #include "server.h"
  43 #include "citserver.h"
  44 #include "support.h"
  45 #include "config.h"
  46 #include "control.h"
  47 #include "user_ops.h"
  48 #include "database.h"
  49 #include "msgbase.h"
  50 #include "euidindex.h"
  51 #include "ctdl_module.h"
  52
  53 /*
  54  * Data passed back and forth between wiki_rev() and its MIME parser callback
  55  */
  56 struct HistoryEraserCallBackData {
  57         char *tempfilename;             /* name of temp file being patched */
  58         char *stop_when;                /* stop when we hit this uuid */
  59         int done;                       /* set to nonzero when we're done patching */
  60 };
  61
  62 /*
  63  * Name of the temporary room we create to store old revisions when someone requests them.
  64  * We put it in an invalid namespace so the DAP cleans up after us later.
  65  */
  66 char *wwm = "9999999999.WikiWaybackMachine";
  67
  68 /*
  69  * Before allowing a wiki page save to execute, we have to perform version control.
  70  * This involves fetching the old version of the page if it exists.
  71  */
  72 int wiki_upload_beforesave(struct CtdlMessage *msg) {
  73         struct CitContext *CCC = CC;
  74         long old_msgnum = (-1L);
  75         struct CtdlMessage *old_msg = NULL;
  76         long history_msgnum = (-1L);
  77         struct CtdlMessage *history_msg = NULL;
  78         char diff_old_filename[PATH_MAX];
  79         char diff_new_filename[PATH_MAX];
  80         char diff_out_filename[PATH_MAX];
  81         char diff_cmd[PATH_MAX];
  82         FILE *fp;
  83         int rv;
  84         char history_page[1024];
  85         char boundary[256];
  86         char prefixed_boundary[258];
  87         char buf[1024];
  88         char *diffbuf = NULL;
  89         size_t diffbuf_len = 0;
  90         char *ptr = NULL;
  91
  92         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
  93
  94         /* Is this a room with a Wiki in it, don't run this hook. */
  95         if (CCC->room.QRdefaultview != VIEW_WIKI) {
  96                 return(0);
  97         }
  98
  99         /* If this isn't a MIME message, don't bother. */
 100         if (msg->cm_format_type != 4) return(0);
 101
 102         /* If there's no EUID we can't do this.  Reject the post. */
 103         if (msg->cm_fields['E'] == NULL) return(1);
 104
 105         snprintf(history_page, sizeof history_page, "%s_HISTORY_", msg->cm_fields['E']);
 106
 107         /* Make sure we're saving a real wiki page rather than a wiki history page.
 108          * This is important in order to avoid recursing infinitely into this hook.
 109          */
 110         if (    (strlen(msg->cm_fields['E']) >= 9)
 111                 && (!strcasecmp(&msg->cm_fields['E'][strlen(msg->cm_fields['E'])-9], "_HISTORY_"))
 112         ) {
 113                 syslog(LOG_DEBUG, "History page not being historied\n");
 114                 return(0);
 115         }
 116
 117         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 118         if (msg->cm_fields['M'] == NULL) return(0);
 119
 120         /* Set the message subject identical to the page name */
 121         if (msg->cm_fields['U'] != NULL) {
 122                 free(msg->cm_fields['U']);
 123         }
 124         msg->cm_fields['U'] = strdup(msg->cm_fields['E']);
 125
 126         /* See if we can retrieve the previous version. */
 127         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields['E'], &CCC->room);
 128         if (old_msgnum > 0L) {
 129                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 130         }
 131         else {
 132                 old_msg = NULL;
 133         }
 134
 135         if ((old_msg != NULL) && (old_msg->cm_fields['M'] == NULL)) {   /* old version is corrupt? */
 136                 CtdlFreeMessage(old_msg);
 137                 old_msg = NULL;
 138         }
 139
 140         /* If no changes were made, don't bother saving it again */
 141         if ((old_msg != NULL) && (!strcmp(msg->cm_fields['M'], old_msg->cm_fields['M']))) {
 142                 CtdlFreeMessage(old_msg);
 143                 return(1);
 144         }
 145
 146         /*
 147          * Generate diffs
 148          */
 149         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 150         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 151         CtdlMakeTempFileName(diff_out_filename, sizeof diff_out_filename);
 152
 153         if (old_msg != NULL) {
 154                 fp = fopen(diff_old_filename, "w");
 155                 rv = fwrite(old_msg->cm_fields['M'], strlen(old_msg->cm_fields['M']), 1, fp);
 156                 fclose(fp);
 157                 CtdlFreeMessage(old_msg);
 158         }
 159
 160         fp = fopen(diff_new_filename, "w");
 161         rv = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 162         fclose(fp);
 163
 164         snprintf(diff_cmd, sizeof diff_cmd,
 165                 DIFF " -u %s %s >%s",
 166                 diff_new_filename,
 167                 ((old_msg != NULL) ? diff_old_filename : "/dev/null"),
 168                 diff_out_filename
 169         );
 170         syslog(LOG_DEBUG, "diff cmd: %s", diff_cmd);
 171         rv = system(diff_cmd);
 172         syslog(LOG_DEBUG, "diff cmd returned %d", rv);
 173
 174         diffbuf_len = 0;
 175         diffbuf = NULL;
 176         fp = fopen(diff_out_filename, "r");
 177         if (fp == NULL) {
 178                 fp = fopen("/dev/null", "r");
 179         }
 180         if (fp != NULL) {
 181                 fseek(fp, 0L, SEEK_END);
 182                 diffbuf_len = ftell(fp);
 183                 fseek(fp, 0L, SEEK_SET);
 184                 diffbuf = malloc(diffbuf_len + 1);
 185                 fread(diffbuf, diffbuf_len, 1, fp);
 186                 diffbuf[diffbuf_len] = 0;
 187                 fclose(fp);
 188         }
 189
 190         syslog(LOG_DEBUG, "diff length is "SIZE_T_FMT" bytes", diffbuf_len);
 191
 192         unlink(diff_old_filename);
 193         unlink(diff_new_filename);
 194         unlink(diff_out_filename);
 195
 196         /* Determine whether this was a bogus (empty) edit */
 197         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 198                 free(diffbuf);
 199                 diffbuf = NULL;
 200         }
 201         if (diffbuf == NULL) {
 202                 return(1);              /* No changes at all?  Abandon the post entirely! */
 203         }
 204
 205         /* Now look for the existing edit history */
 206
 207         history_msgnum = CtdlLocateMessageByEuid(history_page, &CCC->room);
 208         history_msg = NULL;
 209         if (history_msgnum > 0L) {
 210                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 211         }
 212
 213         /* Create a new history message if necessary */
 214         if (history_msg == NULL) {
 215                 history_msg = malloc(sizeof(struct CtdlMessage));
 216                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 217                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 218                 history_msg->cm_anon_type = MES_NORMAL;
 219                 history_msg->cm_format_type = FMT_RFC822;
 220                 history_msg->cm_fields['A'] = strdup("Citadel");
 221                 history_msg->cm_fields['R'] = strdup(CCC->room.QRname);
 222                 history_msg->cm_fields['E'] = strdup(history_page);
 223                 history_msg->cm_fields['U'] = strdup(history_page);
 224                 history_msg->cm_fields['1'] = strdup("1");              /* suppress full text indexing */
 225                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 226                 history_msg->cm_fields['M'] = malloc(1024);
 227                 snprintf(history_msg->cm_fields['M'], 1024,
 228                         "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 229                         "This is a Citadel wiki history encoded as multipart MIME.\n"
 230                         "Each part is comprised of a diff script representing one change set.\n"
 231                         "\n"
 232                         "--%s--\n"
 233                         ,
 234                         boundary, boundary
 235                 );
 236         }
 237
 238         /* Update the history message (regardless of whether it's new or existing) */
 239
 240         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 241          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 242          */
 243         if (history_msg->cm_fields['I'] != NULL) {
 244                 free(history_msg->cm_fields['I']);
 245                 history_msg->cm_fields['I'] = NULL;
 246         }
 247
 248         /* Figure out the boundary string.  We do this even when we generated the
 249          * boundary string in the above code, just to be safe and consistent.
 250          */
 251         strcpy(boundary, "");
 252
 253         ptr = history_msg->cm_fields['M'];
 254         do {
 255                 ptr = memreadline(ptr, buf, sizeof buf);
 256                 if (*ptr != 0) {
 257                         striplt(buf);
 258                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 259                                 if (
 260                                         (bmstrcasestr(buf, "multipart") != NULL)
 261                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 262                                 ) {
 263                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 264                                         char *qu;
 265                                         qu = strchr(boundary, '\"');
 266                                         if (qu) {
 267                                                 strcpy(boundary, ++qu);
 268                                         }
 269                                         qu = strchr(boundary, '\"');
 270                                         if (qu) {
 271                                                 *qu = 0;
 272                                         }
 273                                 }
 274                         }
 275                 }
 276         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 277
 278         /*
 279          * Now look for the first boundary.  That is where we need to insert our fun.
 280          */
 281         if (!IsEmptyStr(boundary)) {
 282                 snprintf(prefixed_boundary, sizeof prefixed_boundary, "--%s", boundary);
 283                 history_msg->cm_fields['M'] = realloc(history_msg->cm_fields['M'],
 284                         strlen(history_msg->cm_fields['M']) + strlen(diffbuf) + 1024
 285                 );
 286                 ptr = bmstrcasestr(history_msg->cm_fields['M'], prefixed_boundary);
 287                 if (ptr != NULL) {
 288                         char *the_rest_of_it = strdup(ptr);
 289                         char uuid[64];
 290                         char memo[512];
 291                         char encoded_memo[1024];
 292                         generate_uuid(uuid);
 293                         snprintf(memo, sizeof memo, "%s|%ld|%s|%s",
 294                                 uuid,
 295                                 time(NULL),
 296                                 CCC->user.fullname,
 297                                 config.c_nodename
 298                         );
 299                         CtdlEncodeBase64(encoded_memo, memo, strlen(memo), 0);
 300                         sprintf(ptr, "--%s\n"
 301                                         "Content-type: text/plain\n"
 302                                         "Content-Disposition: inline; filename=\"%s\"\n"
 303                                         "Content-Transfer-Encoding: 8bit\n"
 304                                         "\n"
 305                                         "%s\n"
 306                                         "%s"
 307                                         ,
 308                                 boundary,
 309                                 encoded_memo,
 310                                 diffbuf,
 311                                 the_rest_of_it
 312                         );
 313                         free(the_rest_of_it);
 314                 }
 315
 316                 history_msg->cm_fields['T'] = realloc(history_msg->cm_fields['T'], 32);
 317                 if (history_msg->cm_fields['T'] != NULL) {
 318                         snprintf(history_msg->cm_fields['T'], 32, "%ld", time(NULL));
 319                 }
 320
 321                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 322         }
 323         else {
 324                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 325         }
 326
 327         free(diffbuf);
 328         free(history_msg);
 329         return(0);
 330 }
 331
 332
 333 /*
 334  * MIME Parser callback for wiki_history()
 335  *
 336  * The "filename" field will contain a memo field.  All we have to do is decode
 337  * the base64 and output it.  The data is already in a delimited format suitable
 338  * for our client protocol.
 339  */
 340 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 341                    void *content, char *cbtype, char *cbcharset, size_t length,
 342                    char *encoding, char *cbid, void *cbuserdata)
 343 {
 344         char memo[1024];
 345
 346         CtdlDecodeBase64(memo, filename, strlen(filename));
 347         cprintf("%s\n", memo);
 348 }
 349
 350
 351 /*
 352  * Fetch a list of revisions for a particular wiki page
 353  */
 354 void wiki_history(char *pagename) {
 355         int r;
 356         char history_page_name[270];
 357         long msgnum;
 358         struct CtdlMessage *msg;
 359
 360         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 361         if (r != om_ok) {
 362                 if (r == om_not_logged_in) {
 363                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 364                 }
 365                 else {
 366                         cprintf("%d An unknown error has occurred.\n", ERROR);
 367                 }
 368                 return;
 369         }
 370
 371         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 372         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 373         if (msgnum > 0L) {
 374                 msg = CtdlFetchMessage(msgnum, 1);
 375         }
 376         else {
 377                 msg = NULL;
 378         }
 379
 380         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 381                 CtdlFreeMessage(msg);
 382                 msg = NULL;
 383         }
 384
 385         if (msg == NULL) {
 386                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 387                 return;
 388         }
 389
 390
 391         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 392         mime_parser(msg->cm_fields['M'], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 393         cprintf("000\n");
 394
 395         CtdlFreeMessage(msg);
 396         return;
 397 }
 398
 399 /*
 400  * MIME Parser callback for wiki_rev()
 401  *
 402  * The "filename" field will contain a memo field, which includes (among other things)
 403  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 404  *
 405  * The "content" filed will contain "diff" output suitable for applying via "patch"
 406  * to our temporary file.
 407  */
 408 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 409                    void *content, char *cbtype, char *cbcharset, size_t length,
 410                    char *encoding, char *cbid, void *cbuserdata)
 411 {
 412         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 413         char memo[1024];
 414         char this_rev[256];
 415         FILE *fp;
 416         char *ptr = NULL;
 417         char buf[1024];
 418
 419         /* Did a previous callback already indicate that we've reached our target uuid?
 420          * If so, don't process anything else.
 421          */
 422         if (hecbd->done) {
 423                 return;
 424         }
 425
 426         CtdlDecodeBase64(memo, filename, strlen(filename));
 427         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 428         striplt(this_rev);
 429
 430         /* Perform the patch */
 431         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 432         if (fp) {
 433                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 434                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 435                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 436
 437                 ptr = (char *)content;
 438                 int linenum = 0;
 439                 do {
 440                         ++linenum;
 441                         ptr = memreadline(ptr, buf, sizeof buf);
 442                         if (*ptr != 0) {
 443                                 if (linenum <= 2) {
 444                                         /* skip the first two lines; they contain bogus filenames */
 445                                 }
 446                                 else {
 447                                         fprintf(fp, "%s\n", buf);
 448                                 }
 449                         }
 450                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 451                 if (pclose(fp) != 0) {
 452                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 453                 }
 454         }
 455
 456         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 457                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 458                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 459                 hecbd->done = 1;
 460         }
 461 }
 462
 463
 464 /*
 465  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 466  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 467  * to revert the currently active page to that revision.
 468  */
 469 void wiki_rev(char *pagename, char *rev, char *operation)
 470 {
 471         int r;
 472         char history_page_name[270];
 473         long msgnum;
 474         char temp[PATH_MAX];
 475         char timestamp[64];
 476         struct CtdlMessage *msg;
 477         FILE *fp;
 478         struct HistoryEraserCallBackData hecbd;
 479         long len = 0L;
 480         int rv;
 481
 482         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 483         if (r != om_ok) {
 484                 if (r == om_not_logged_in) {
 485                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 486                 }
 487                 else {
 488                         cprintf("%d An unknown error has occurred.\n", ERROR);
 489                 }
 490                 return;
 491         }
 492
 493         if (!strcasecmp(operation, "revert")) {
 494                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 495                 if (r != 0) {
 496                         cprintf("%d %s\n", r, temp);
 497                         return;
 498                 }
 499         }
 500
 501         /* Begin by fetching the current version of the page.  We're going to patch
 502          * backwards through the diffs until we get the one we want.
 503          */
 504         msgnum = CtdlLocateMessageByEuid(pagename, &CC->room);
 505         if (msgnum > 0L) {
 506                 msg = CtdlFetchMessage(msgnum, 1);
 507         }
 508         else {
 509                 msg = NULL;
 510         }
 511
 512         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 513                 CtdlFreeMessage(msg);
 514                 msg = NULL;
 515         }
 516
 517         if (msg == NULL) {
 518                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 519                 return;
 520         }
 521
 522         /* Output it to a temporary file */
 523
 524         CtdlMakeTempFileName(temp, sizeof temp);
 525         fp = fopen(temp, "w");
 526         if (fp != NULL) {
 527                 r = fwrite(msg->cm_fields['M'], strlen(msg->cm_fields['M']), 1, fp);
 528                 fclose(fp);
 529         }
 530         else {
 531                 syslog(LOG_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 532         }
 533         CtdlFreeMessage(msg);
 534
 535         /* Get the revision history */
 536
 537         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 538         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 539         if (msgnum > 0L) {
 540                 msg = CtdlFetchMessage(msgnum, 1);
 541         }
 542         else {
 543                 msg = NULL;
 544         }
 545
 546         if ((msg != NULL) && (msg->cm_fields['M'] == NULL)) {
 547                 CtdlFreeMessage(msg);
 548                 msg = NULL;
 549         }
 550
 551         if (msg == NULL) {
 552                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 553                 return;
 554         }
 555
 556         /* Start patching backwards (newest to oldest) through the revision history until we
 557          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 558          */
 559
 560         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 561         hecbd.tempfilename = temp;
 562         hecbd.stop_when = rev;
 563         striplt(hecbd.stop_when);
 564
 565         mime_parser(msg->cm_fields['M'], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 566         CtdlFreeMessage(msg);
 567
 568         /* Were we successful? */
 569         if (hecbd.done == 0) {
 570                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 571                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 572                 );
 573         }
 574
 575         /* We have the desired revision on disk.  Now do something with it. */
 576
 577         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 578                 msg = malloc(sizeof(struct CtdlMessage));
 579                 memset(msg, 0, sizeof(struct CtdlMessage));
 580                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 581                 msg->cm_anon_type = MES_NORMAL;
 582                 msg->cm_format_type = FMT_RFC822;
 583                 fp = fopen(temp, "r");
 584                 if (fp) {
 585                         fseek(fp, 0L, SEEK_END);
 586                         len = ftell(fp);
 587                         fseek(fp, 0L, SEEK_SET);
 588                         msg->cm_fields['M'] = malloc(len + 1);
 589                         rv = fread(msg->cm_fields['M'], len, 1, fp);
 590                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 591                         msg->cm_fields['M'][len] = 0;
 592                         fclose(fp);
 593                 }
 594                 if (len <= 0) {
 595                         msgnum = (-1L);
 596                 }
 597                 else if (!strcasecmp(operation, "fetch")) {
 598                         msg->cm_fields['A'] = strdup("Citadel");
 599                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 600                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 601
 602                         /*
 603                          * WARNING: VILE SLEAZY HACK
 604                          * This will avoid the 'message xxx is not in this room' security error,
 605                          * but only if the client fetches the message we just generated immediately
 606                          * without first trying to perform other fetch operations.
 607                          */
 608                         if (CC->cached_msglist != NULL) {
 609                                 free(CC->cached_msglist);
 610                                 CC->cached_msglist = NULL;
 611                                 CC->cached_num_msgs = 0;
 612                         }
 613                         CC->cached_msglist = malloc(sizeof(long));
 614                         if (CC->cached_msglist != NULL) {
 615                                 CC->cached_num_msgs = 1;
 616                                 CC->cached_msglist[0] = msgnum;
 617                         }
 618
 619                 }
 620                 else if (!strcasecmp(operation, "revert")) {
 621                         snprintf(timestamp, sizeof timestamp, "%ld", time(NULL));
 622                         msg->cm_fields['T'] = strdup(timestamp);
 623                         msg->cm_fields['A'] = strdup(CC->user.fullname);
 624                         msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 625                         msg->cm_fields['O'] = strdup(CC->room.QRname);
 626                         msg->cm_fields['N'] = strdup(NODENAME);
 627                         msg->cm_fields['E'] = strdup(pagename);
 628                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 629                 }
 630                 else {
 631                         /* Theoretically it is impossible to get here, but throw an error anyway */
 632                         msgnum = (-1L);
 633                 }
 634                 CtdlFreeMessage(msg);
 635                 if (msgnum >= 0L) {
 636                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 637                 }
 638                 else {
 639                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 640                 }
 641         }
 642
 643         /* We did all this work for nothing.  Express anguish to the caller. */
 644         else {
 645                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 646         }
 647
 648         unlink(temp);
 649         return;
 650 }
 651
 652
 653
 654 /*
 655  * commands related to wiki management
 656  */
 657 void cmd_wiki(char *argbuf) {
 658         char subcmd[32];
 659         char pagename[256];
 660         char rev[128];
 661         char operation[16];
 662
 663         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 664
 665         if (!strcasecmp(subcmd, "history")) {
 666                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 667                 wiki_history(pagename);
 668                 return;
 669         }
 670
 671         if (!strcasecmp(subcmd, "rev")) {
 672                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 673                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 674                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 675                 wiki_rev(pagename, rev, operation);
 676                 return;
 677         }
 678
 679         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 680 }
 681
 682
 683
 684 /*
 685  * Module initialization
 686  */
 687 CTDL_MODULE_INIT(wiki)
 688 {
 689         if (!threading)
 690         {
 691                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 692                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 693         }
 694
 695         /* return our module name for the log */
 696         return "wiki";
 697 }