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 "room_ops.h"
  49 #include "database.h"
  50 #include "msgbase.h"
  51 #include "euidindex.h"
  52 #include "ctdl_module.h"
  53
  54 /*
  55  * Data passed back and forth between wiki_rev() and its MIME parser callback
  56  */
  57 struct HistoryEraserCallBackData {
  58         char *tempfilename;             /* name of temp file being patched */
  59         char *stop_when;                /* stop when we hit this uuid */
  60         int done;                       /* set to nonzero when we're done patching */
  61 };
  62
  63 /*
  64  * Name of the temporary room we create to store old revisions when someone requests them.
  65  * We put it in an invalid namespace so the DAP cleans up after us later.
  66  */
  67 char *wwm = "9999999999.WikiWaybackMachine";
  68
  69 /*
  70  * Before allowing a wiki page save to execute, we have to perform version control.
  71  * This involves fetching the old version of the page if it exists.
  72  */
  73 int wiki_upload_beforesave(struct CtdlMessage *msg, recptypes *recp) {
  74         struct CitContext *CCC = CC;
  75         long old_msgnum = (-1L);
  76         struct CtdlMessage *old_msg = NULL;
  77         long history_msgnum = (-1L);
  78         struct CtdlMessage *history_msg = NULL;
  79         char diff_old_filename[PATH_MAX];
  80         char diff_new_filename[PATH_MAX];
  81         char diff_out_filename[PATH_MAX];
  82         char diff_cmd[PATH_MAX];
  83         FILE *fp;
  84         int rv;
  85         char history_page[1024];
  86         long history_page_len;
  87         char boundary[256];
  88         char prefixed_boundary[258];
  89         char buf[1024];
  90         char *diffbuf = NULL;
  91         size_t diffbuf_len = 0;
  92         char *ptr = NULL;
  93
  94         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
  95
  96         /* Is this a room with a Wiki in it, don't run this hook. */
  97         if (CCC->room.QRdefaultview != VIEW_WIKI) {
  98                 return(0);
  99         }
 100
 101         /* If this isn't a MIME message, don't bother. */
 102         if (msg->cm_format_type != 4) return(0);
 103
 104         /* If there's no EUID we can't do this.  Reject the post. */
 105         if (CM_IsEmpty(msg, eExclusiveID)) return(1);
 106
 107         history_page_len = snprintf(history_page, sizeof history_page,
 108                                     "%s_HISTORY_", msg->cm_fields[eExclusiveID]);
 109
 110         /* Make sure we're saving a real wiki page rather than a wiki history page.
 111          * This is important in order to avoid recursing infinitely into this hook.
 112          */
 113         if (    (msg->cm_lengths[eExclusiveID] >= 9)
 114                 && (!strcasecmp(&msg->cm_fields[eExclusiveID][msg->cm_lengths[eExclusiveID]-9], "_HISTORY_"))
 115         ) {
 116                 syslog(LOG_DEBUG, "History page not being historied\n");
 117                 return(0);
 118         }
 119
 120         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 121         if (CM_IsEmpty(msg, eMesageText)) return(0);
 122
 123         /* Set the message subject identical to the page name */
 124         CM_CopyField(msg, eMsgSubject, eExclusiveID);
 125
 126         /* See if we can retrieve the previous version. */
 127         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields[eExclusiveID], &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) && (CM_IsEmpty(old_msg, eMesageText))) {  /* old version is corrupt? */
 136                 CM_Free(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[eMesageText], old_msg->cm_fields[eMesageText]))) {
 142                 CM_Free(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[eMesageText], old_msg->cm_lengths[eMesageText], 1, fp);
 156                 fclose(fp);
 157                 CM_Free(old_msg);
 158         }
 159
 160         fp = fopen(diff_new_filename, "w");
 161         rv = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 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                 char *buf;
 216                 long len;
 217
 218                 history_msg = malloc(sizeof(struct CtdlMessage));
 219                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 220                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 221                 history_msg->cm_anon_type = MES_NORMAL;
 222                 history_msg->cm_format_type = FMT_RFC822;
 223                 CM_SetField(history_msg, eAuthor, HKEY("Citadel"));
 224                 CM_SetField(history_msg, eRecipient, CCC->room.QRname, strlen(CCC->room.QRname));
 225                 CM_SetField(history_msg, eExclusiveID, history_page, history_page_len);
 226                 CM_SetField(history_msg, eMsgSubject, history_page, history_page_len);
 227                 CM_SetField(history_msg, eSuppressIdx, HKEY("1")); /* suppress full text indexing */
 228                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 229                 buf = (char*) malloc(1024);
 230                 len = snprintf(buf, 1024,
 231                                "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 232                                "This is a Citadel wiki history encoded as multipart MIME.\n"
 233                                "Each part is comprised of a diff script representing one change set.\n"
 234                                "\n"
 235                                "--%s--\n",
 236                                boundary, boundary
 237                 );
 238                 CM_SetAsField(history_msg, eMesageText, &buf, len);
 239         }
 240
 241         /* Update the history message (regardless of whether it's new or existing) */
 242
 243         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 244          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 245          */
 246         CM_FlushField(history_msg, emessageId);
 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         *boundary = '\0';
 252
 253         ptr = history_msg->cm_fields[eMesageText];
 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                 char *MsgText;
 283                 long MsgTextLen;
 284                 time_t Now = time(NULL);
 285
 286                 snprintf(prefixed_boundary, sizeof(prefixed_boundary), "--%s", boundary);
 287
 288                 CM_GetAsField(history_msg, eMesageText, &MsgText, &MsgTextLen);
 289
 290                 ptr = bmstrcasestr(MsgText, prefixed_boundary);
 291                 if (ptr != NULL) {
 292                         StrBuf *NewMsgText;
 293                         char uuid[64];
 294                         char memo[512];
 295                         long memolen;
 296                         char encoded_memo[1024];
 297
 298                         NewMsgText = NewStrBufPlain(NULL, MsgTextLen + diffbuf_len + 1024);
 299
 300                         generate_uuid(uuid);
 301                         memolen = snprintf(memo, sizeof(memo), "%s|%ld|%s|%s",
 302                                            uuid,
 303                                            Now,
 304                                            CCC->user.fullname,
 305                                            config.c_nodename);
 306
 307                         memolen = CtdlEncodeBase64(encoded_memo, memo, memolen, 0);
 308
 309                         StrBufAppendBufPlain(NewMsgText, HKEY("--"), 0);
 310                         StrBufAppendBufPlain(NewMsgText, boundary, -1, 0);
 311                         StrBufAppendBufPlain(
 312                                 NewMsgText,
 313                                 HKEY("\n"
 314                                      "Content-type: text/plain\n"
 315                                      "Content-Disposition: inline; filename=\""), 0);
 316
 317                         StrBufAppendBufPlain(NewMsgText, encoded_memo, memolen, 0);
 318
 319                         StrBufAppendBufPlain(
 320                                 NewMsgText,
 321                                 HKEY("\"\n"
 322                                      "Content-Transfer-Encoding: 8bit\n"
 323                                      "\n"), 0);
 324
 325                         StrBufAppendBufPlain(NewMsgText, diffbuf, diffbuf_len, 0);
 326                         StrBufAppendBufPlain(NewMsgText, HKEY("\n"), 0);
 327
 328                         StrBufAppendBufPlain(NewMsgText, ptr, MsgTextLen - (ptr - MsgText), 0);
 329                         free(MsgText);
 330                         CM_SetAsFieldSB(history_msg, eMesageText, &NewMsgText);
 331                 }
 332                 else
 333                 {
 334                         CM_SetAsField(history_msg, eMesageText, &MsgText, MsgTextLen);
 335                 }
 336
 337                 CM_SetFieldLONG(history_msg, eTimestamp, Now);
 338
 339                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 340         }
 341         else {
 342                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 343         }
 344
 345         free(diffbuf);
 346         CM_Free(history_msg);
 347         return(0);
 348 }
 349
 350
 351 /*
 352  * MIME Parser callback for wiki_history()
 353  *
 354  * The "filename" field will contain a memo field.  All we have to do is decode
 355  * the base64 and output it.  The data is already in a delimited format suitable
 356  * for our client protocol.
 357  */
 358 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 359                    void *content, char *cbtype, char *cbcharset, size_t length,
 360                    char *encoding, char *cbid, void *cbuserdata)
 361 {
 362         char memo[1024];
 363
 364         CtdlDecodeBase64(memo, filename, strlen(filename));
 365         cprintf("%s\n", memo);
 366 }
 367
 368
 369 /*
 370  * Fetch a list of revisions for a particular wiki page
 371  */
 372 void wiki_history(char *pagename) {
 373         int r;
 374         char history_page_name[270];
 375         long msgnum;
 376         struct CtdlMessage *msg;
 377
 378         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 379         if (r != om_ok) {
 380                 if (r == om_not_logged_in) {
 381                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 382                 }
 383                 else {
 384                         cprintf("%d An unknown error has occurred.\n", ERROR);
 385                 }
 386                 return;
 387         }
 388
 389         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 390         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 391         if (msgnum > 0L) {
 392                 msg = CtdlFetchMessage(msgnum, 1);
 393         }
 394         else {
 395                 msg = NULL;
 396         }
 397
 398         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 399                 CM_Free(msg);
 400                 msg = NULL;
 401         }
 402
 403         if (msg == NULL) {
 404                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 405                 return;
 406         }
 407
 408
 409         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 410         mime_parser(CM_RANGE(msg, eMesageText), *wiki_history_callback, NULL, NULL, NULL, 0);
 411         cprintf("000\n");
 412
 413         CM_Free(msg);
 414         return;
 415 }
 416
 417 /*
 418  * MIME Parser callback for wiki_rev()
 419  *
 420  * The "filename" field will contain a memo field, which includes (among other things)
 421  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 422  *
 423  * The "content" filed will contain "diff" output suitable for applying via "patch"
 424  * to our temporary file.
 425  */
 426 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 427                    void *content, char *cbtype, char *cbcharset, size_t length,
 428                    char *encoding, char *cbid, void *cbuserdata)
 429 {
 430         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 431         char memo[1024];
 432         char this_rev[256];
 433         FILE *fp;
 434         char *ptr = NULL;
 435         char buf[1024];
 436
 437         /* Did a previous callback already indicate that we've reached our target uuid?
 438          * If so, don't process anything else.
 439          */
 440         if (hecbd->done) {
 441                 return;
 442         }
 443
 444         CtdlDecodeBase64(memo, filename, strlen(filename));
 445         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 446         striplt(this_rev);
 447
 448         /* Perform the patch */
 449         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 450         if (fp) {
 451                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 452                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 453                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 454
 455                 ptr = (char *)content;
 456                 int linenum = 0;
 457                 do {
 458                         ++linenum;
 459                         ptr = memreadline(ptr, buf, sizeof buf);
 460                         if (*ptr != 0) {
 461                                 if (linenum <= 2) {
 462                                         /* skip the first two lines; they contain bogus filenames */
 463                                 }
 464                                 else {
 465                                         fprintf(fp, "%s\n", buf);
 466                                 }
 467                         }
 468                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 469                 if (pclose(fp) != 0) {
 470                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 471                 }
 472         }
 473
 474         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 475                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 476                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 477                 hecbd->done = 1;
 478         }
 479 }
 480
 481
 482 /*
 483  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 484  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 485  * to revert the currently active page to that revision.
 486  */
 487 void wiki_rev(char *pagename, char *rev, char *operation)
 488 {
 489         struct CitContext *CCC = CC;
 490         int r;
 491         char history_page_name[270];
 492         long msgnum;
 493         char temp[PATH_MAX];
 494         struct CtdlMessage *msg;
 495         FILE *fp;
 496         struct HistoryEraserCallBackData hecbd;
 497         long len = 0L;
 498         int rv;
 499
 500         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 501         if (r != om_ok) {
 502                 if (r == om_not_logged_in) {
 503                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 504                 }
 505                 else {
 506                         cprintf("%d An unknown error has occurred.\n", ERROR);
 507                 }
 508                 return;
 509         }
 510
 511         if (!strcasecmp(operation, "revert")) {
 512                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 513                 if (r != 0) {
 514                         cprintf("%d %s\n", r, temp);
 515                         return;
 516                 }
 517         }
 518
 519         /* Begin by fetching the current version of the page.  We're going to patch
 520          * backwards through the diffs until we get the one we want.
 521          */
 522         msgnum = CtdlLocateMessageByEuid(pagename, &CCC->room);
 523         if (msgnum > 0L) {
 524                 msg = CtdlFetchMessage(msgnum, 1);
 525         }
 526         else {
 527                 msg = NULL;
 528         }
 529
 530         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 531                 CM_Free(msg);
 532                 msg = NULL;
 533         }
 534
 535         if (msg == NULL) {
 536                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 537                 return;
 538         }
 539
 540         /* Output it to a temporary file */
 541
 542         CtdlMakeTempFileName(temp, sizeof temp);
 543         fp = fopen(temp, "w");
 544         if (fp != NULL) {
 545                 r = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 546                 fclose(fp);
 547         }
 548         else {
 549                 syslog(LOG_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 550         }
 551         CM_Free(msg);
 552
 553         /* Get the revision history */
 554
 555         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 556         msgnum = CtdlLocateMessageByEuid(history_page_name, &CCC->room);
 557         if (msgnum > 0L) {
 558                 msg = CtdlFetchMessage(msgnum, 1);
 559         }
 560         else {
 561                 msg = NULL;
 562         }
 563
 564         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 565                 CM_Free(msg);
 566                 msg = NULL;
 567         }
 568
 569         if (msg == NULL) {
 570                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 571                 return;
 572         }
 573
 574         /* Start patching backwards (newest to oldest) through the revision history until we
 575          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 576          */
 577
 578         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 579         hecbd.tempfilename = temp;
 580         hecbd.stop_when = rev;
 581         striplt(hecbd.stop_when);
 582
 583         mime_parser(CM_RANGE(msg, eMesageText), *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 584         CM_Free(msg);
 585
 586         /* Were we successful? */
 587         if (hecbd.done == 0) {
 588                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 589                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 590                 );
 591         }
 592
 593         /* We have the desired revision on disk.  Now do something with it. */
 594
 595         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 596                 msg = malloc(sizeof(struct CtdlMessage));
 597                 memset(msg, 0, sizeof(struct CtdlMessage));
 598                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 599                 msg->cm_anon_type = MES_NORMAL;
 600                 msg->cm_format_type = FMT_RFC822;
 601                 fp = fopen(temp, "r");
 602                 if (fp) {
 603                         char *msgbuf;
 604                         fseek(fp, 0L, SEEK_END);
 605                         len = ftell(fp);
 606                         fseek(fp, 0L, SEEK_SET);
 607                         msgbuf = malloc(len + 1);
 608                         rv = fread(msgbuf, len, 1, fp);
 609                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 610                         msgbuf[len] = '\0';
 611                         CM_SetAsField(msg, eMesageText, &msgbuf, len);
 612                         fclose(fp);
 613                 }
 614                 if (len <= 0) {
 615                         msgnum = (-1L);
 616                 }
 617                 else if (!strcasecmp(operation, "fetch")) {
 618                         CM_SetField(msg, eAuthor, HKEY("Citadel"));
 619                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 620                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 621
 622                         /*
 623                          * WARNING: VILE SLEAZY HACK
 624                          * This will avoid the 'message xxx is not in this room' security error,
 625                          * but only if the client fetches the message we just generated immediately
 626                          * without first trying to perform other fetch operations.
 627                          */
 628                         if (CCC->cached_msglist != NULL) {
 629                                 free(CCC->cached_msglist);
 630                                 CCC->cached_msglist = NULL;
 631                                 CCC->cached_num_msgs = 0;
 632                         }
 633                         CCC->cached_msglist = malloc(sizeof(long));
 634                         if (CCC->cached_msglist != NULL) {
 635                                 CCC->cached_num_msgs = 1;
 636                                 CCC->cached_msglist[0] = msgnum;
 637                         }
 638
 639                 }
 640                 else if (!strcasecmp(operation, "revert")) {
 641                         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 642                         CM_SetField(msg, eAuthor, CCC->user.fullname, strlen(CCC->user.fullname));
 643                         CM_SetField(msg, erFc822Addr, CCC->cs_inet_email, strlen(CCC->cs_inet_email));
 644                         CM_SetField(msg, eOriginalRoom, CCC->room.QRname, strlen(CCC->room.QRname));
 645                         CM_SetField(msg, eNodeName, NODENAME, strlen(NODENAME));
 646                         CM_SetField(msg, eExclusiveID, pagename, strlen(pagename));
 647                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 648                 }
 649                 else {
 650                         /* Theoretically it is impossible to get here, but throw an error anyway */
 651                         msgnum = (-1L);
 652                 }
 653                 CM_Free(msg);
 654                 if (msgnum >= 0L) {
 655                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 656                 }
 657                 else {
 658                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 659                 }
 660         }
 661
 662         /* We did all this work for nothing.  Express anguish to the caller. */
 663         else {
 664                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 665         }
 666
 667         unlink(temp);
 668         return;
 669 }
 670
 671
 672
 673 /*
 674  * commands related to wiki management
 675  */
 676 void cmd_wiki(char *argbuf) {
 677         char subcmd[32];
 678         char pagename[256];
 679         char rev[128];
 680         char operation[16];
 681
 682         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 683
 684         if (!strcasecmp(subcmd, "history")) {
 685                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 686                 wiki_history(pagename);
 687                 return;
 688         }
 689
 690         if (!strcasecmp(subcmd, "rev")) {
 691                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 692                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 693                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 694                 wiki_rev(pagename, rev, operation);
 695                 return;
 696         }
 697
 698         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 699 }
 700
 701
 702
 703 /*
 704  * Module initialization
 705  */
 706 CTDL_MODULE_INIT(wiki)
 707 {
 708         if (!threading)
 709         {
 710                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 711                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 712         }
 713
 714         /* return our module name for the log */
 715         return "wiki";
 716 }