citadel/modules/wiki/serv_wiki.c

   1 /*
   2  * Server-side module for Wiki rooms.  This handles things like version control.
   3  *
   4  * Copyright (c) 2009-2020 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         long newmsgid;
  94         StrBuf *msgidbuf;
  95
  96         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
  97
  98         /* Is this a room with a Wiki in it, don't run this hook. */
  99         if ((CCC->room.QRdefaultview != VIEW_WIKI) &&
 100             (CCC->room.QRdefaultview != VIEW_WIKIMD)) {
 101                 return(0);
 102         }
 103
 104         /* If this isn't a MIME message, don't bother. */
 105         if (msg->cm_format_type != 4) return(0);
 106
 107         /* If there's no EUID we can't do this.  Reject the post. */
 108         if (CM_IsEmpty(msg, eExclusiveID)) return(1);
 109
 110         newmsgid = get_new_message_number();
 111         msgidbuf = NewStrBuf();
 112         StrBufPrintf(msgidbuf, "%08lX-%08lX@%s/%s",
 113                      (long unsigned int) time(NULL),
 114                      (long unsigned int) newmsgid,
 115                      CtdlGetConfigStr("c_fqdn"),
 116                      msg->cm_fields[eExclusiveID]
 117                 );
 118
 119         CM_SetAsFieldSB(msg, emessageId, &msgidbuf);
 120
 121         history_page_len = snprintf(history_page, sizeof history_page,
 122                                     "%s_HISTORY_", msg->cm_fields[eExclusiveID]);
 123
 124         /* Make sure we're saving a real wiki page rather than a wiki history page.
 125          * This is important in order to avoid recursing infinitely into this hook.
 126          */
 127         if (    (msg->cm_lengths[eExclusiveID] >= 9)
 128                 && (!strcasecmp(&msg->cm_fields[eExclusiveID][msg->cm_lengths[eExclusiveID]-9], "_HISTORY_"))
 129         ) {
 130                 syslog(LOG_DEBUG, "History page not being historied\n");
 131                 return(0);
 132         }
 133
 134         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 135         if (CM_IsEmpty(msg, eMesageText)) return(0);
 136
 137         /* Set the message subject identical to the page name */
 138         CM_CopyField(msg, eMsgSubject, eExclusiveID);
 139
 140         /* See if we can retrieve the previous version. */
 141         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields[eExclusiveID], &CCC->room);
 142         if (old_msgnum > 0L) {
 143                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 144         }
 145         else {
 146                 old_msg = NULL;
 147         }
 148
 149         if ((old_msg != NULL) && (CM_IsEmpty(old_msg, eMesageText))) {  /* old version is corrupt? */
 150                 CM_Free(old_msg);
 151                 old_msg = NULL;
 152         }
 153
 154         /* If no changes were made, don't bother saving it again */
 155         if ((old_msg != NULL) && (!strcmp(msg->cm_fields[eMesageText], old_msg->cm_fields[eMesageText]))) {
 156                 CM_Free(old_msg);
 157                 return(1);
 158         }
 159
 160         /*
 161          * Generate diffs
 162          */
 163         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 164         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 165         CtdlMakeTempFileName(diff_out_filename, sizeof diff_out_filename);
 166
 167         if (old_msg != NULL) {
 168                 fp = fopen(diff_old_filename, "w");
 169                 rv = fwrite(old_msg->cm_fields[eMesageText], old_msg->cm_lengths[eMesageText], 1, fp);
 170                 fclose(fp);
 171                 CM_Free(old_msg);
 172         }
 173
 174         fp = fopen(diff_new_filename, "w");
 175         rv = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 176         fclose(fp);
 177
 178         snprintf(diff_cmd, sizeof diff_cmd,
 179                 DIFF " -u %s %s >%s",
 180                 diff_new_filename,
 181                 ((old_msg != NULL) ? diff_old_filename : "/dev/null"),
 182                 diff_out_filename
 183         );
 184         syslog(LOG_DEBUG, "diff cmd: %s", diff_cmd);
 185         rv = system(diff_cmd);
 186         syslog(LOG_DEBUG, "diff cmd returned %d", rv);
 187
 188         diffbuf_len = 0;
 189         diffbuf = NULL;
 190         fp = fopen(diff_out_filename, "r");
 191         if (fp == NULL) {
 192                 fp = fopen("/dev/null", "r");
 193         }
 194         if (fp != NULL) {
 195                 fseek(fp, 0L, SEEK_END);
 196                 diffbuf_len = ftell(fp);
 197                 fseek(fp, 0L, SEEK_SET);
 198                 diffbuf = malloc(diffbuf_len + 1);
 199                 fread(diffbuf, diffbuf_len, 1, fp);
 200                 diffbuf[diffbuf_len] = '\0';
 201                 fclose(fp);
 202         }
 203
 204         syslog(LOG_DEBUG, "diff length is "SIZE_T_FMT" bytes", diffbuf_len);
 205
 206         unlink(diff_old_filename);
 207         unlink(diff_new_filename);
 208         unlink(diff_out_filename);
 209
 210         /* Determine whether this was a bogus (empty) edit */
 211         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 212                 free(diffbuf);
 213                 diffbuf = NULL;
 214         }
 215         if (diffbuf == NULL) {
 216                 return(1);              /* No changes at all?  Abandon the post entirely! */
 217         }
 218
 219         /* Now look for the existing edit history */
 220
 221         history_msgnum = CtdlLocateMessageByEuid(history_page, &CCC->room);
 222         history_msg = NULL;
 223         if (history_msgnum > 0L) {
 224                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 225         }
 226
 227         /* Create a new history message if necessary */
 228         if (history_msg == NULL) {
 229                 char *buf;
 230                 long len;
 231
 232                 history_msg = malloc(sizeof(struct CtdlMessage));
 233                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 234                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 235                 history_msg->cm_anon_type = MES_NORMAL;
 236                 history_msg->cm_format_type = FMT_RFC822;
 237                 CM_SetField(history_msg, eAuthor, HKEY("Citadel"));
 238                 if (!IsEmptyStr(CCC->room.QRname)){
 239                         CM_SetField(history_msg, eRecipient, CCC->room.QRname, strlen(CCC->room.QRname));
 240                 }
 241                 CM_SetField(history_msg, eExclusiveID, history_page, history_page_len);
 242                 CM_SetField(history_msg, eMsgSubject, history_page, history_page_len);
 243                 CM_SetField(history_msg, eSuppressIdx, HKEY("1")); /* suppress full text indexing */
 244                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 245                 buf = (char*) malloc(1024);
 246                 len = snprintf(buf, 1024,
 247                                "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 248                                "This is a Citadel wiki history encoded as multipart MIME.\n"
 249                                "Each part is comprised of a diff script representing one change set.\n"
 250                                "\n"
 251                                "--%s--\n",
 252                                boundary, boundary
 253                 );
 254                 CM_SetAsField(history_msg, eMesageText, &buf, len);
 255         }
 256
 257         /* Update the history message (regardless of whether it's new or existing) */
 258
 259         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 260          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 261          */
 262         CM_FlushField(history_msg, emessageId);
 263
 264         /* Figure out the boundary string.  We do this even when we generated the
 265          * boundary string in the above code, just to be safe and consistent.
 266          */
 267         *boundary = '\0';
 268
 269         ptr = history_msg->cm_fields[eMesageText];
 270         do {
 271                 ptr = memreadline(ptr, buf, sizeof buf);
 272                 if (*ptr != 0) {
 273                         striplt(buf);
 274                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 275                                 if (
 276                                         (bmstrcasestr(buf, "multipart") != NULL)
 277                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 278                                 ) {
 279                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 280                                         char *qu;
 281                                         qu = strchr(boundary, '\"');
 282                                         if (qu) {
 283                                                 strcpy(boundary, ++qu);
 284                                         }
 285                                         qu = strchr(boundary, '\"');
 286                                         if (qu) {
 287                                                 *qu = 0;
 288                                         }
 289                                 }
 290                         }
 291                 }
 292         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 293
 294         /*
 295          * Now look for the first boundary.  That is where we need to insert our fun.
 296          */
 297         if (!IsEmptyStr(boundary)) {
 298                 char *MsgText;
 299                 long MsgTextLen;
 300                 time_t Now = time(NULL);
 301
 302                 snprintf(prefixed_boundary, sizeof(prefixed_boundary), "--%s", boundary);
 303
 304                 CM_GetAsField(history_msg, eMesageText, &MsgText, &MsgTextLen);
 305
 306                 ptr = bmstrcasestr(MsgText, prefixed_boundary);
 307                 if (ptr != NULL) {
 308                         StrBuf *NewMsgText;
 309                         char uuid[64];
 310                         char memo[512];
 311                         long memolen;
 312                         char encoded_memo[1024];
 313
 314                         NewMsgText = NewStrBufPlain(NULL, MsgTextLen + diffbuf_len + 1024);
 315
 316                         generate_uuid(uuid);
 317                         memolen = snprintf(memo, sizeof(memo), "%s|%ld|%s|%s",
 318                                            uuid,
 319                                            Now,
 320                                            CCC->user.fullname,
 321                                            CtdlGetConfigStr("c_nodename"));
 322
 323                         memolen = CtdlEncodeBase64(encoded_memo, memo, memolen, 0);
 324
 325                         StrBufAppendBufPlain(NewMsgText, HKEY("--"), 0);
 326                         StrBufAppendBufPlain(NewMsgText, boundary, -1, 0);
 327                         StrBufAppendBufPlain(
 328                                 NewMsgText,
 329                                 HKEY("\n"
 330                                      "Content-type: text/plain\n"
 331                                      "Content-Disposition: inline; filename=\""), 0);
 332
 333                         StrBufAppendBufPlain(NewMsgText, encoded_memo, memolen, 0);
 334
 335                         StrBufAppendBufPlain(
 336                                 NewMsgText,
 337                                 HKEY("\"\n"
 338                                      "Content-Transfer-Encoding: 8bit\n"
 339                                      "\n"), 0);
 340
 341                         StrBufAppendBufPlain(NewMsgText, diffbuf, diffbuf_len, 0);
 342                         StrBufAppendBufPlain(NewMsgText, HKEY("\n"), 0);
 343
 344                         StrBufAppendBufPlain(NewMsgText, ptr, MsgTextLen - (ptr - MsgText), 0);
 345                         free(MsgText);
 346                         CM_SetAsFieldSB(history_msg, eMesageText, &NewMsgText);
 347                 }
 348                 else
 349                 {
 350                         CM_SetAsField(history_msg, eMesageText, &MsgText, MsgTextLen);
 351                 }
 352
 353                 CM_SetFieldLONG(history_msg, eTimestamp, Now);
 354
 355                 CtdlSubmitMsg(history_msg, NULL, "");
 356         }
 357         else {
 358                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 359         }
 360
 361         free(diffbuf);
 362         CM_Free(history_msg);
 363         return(0);
 364 }
 365
 366
 367 /*
 368  * MIME Parser callback for wiki_history()
 369  *
 370  * The "filename" field will contain a memo field.  All we have to do is decode
 371  * the base64 and output it.  The data is already in a delimited format suitable
 372  * for our client protocol.
 373  */
 374 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 375                    void *content, char *cbtype, char *cbcharset, size_t length,
 376                    char *encoding, char *cbid, void *cbuserdata)
 377 {
 378         char memo[1024];
 379
 380         CtdlDecodeBase64(memo, filename, strlen(filename));
 381         cprintf("%s\n", memo);
 382 }
 383
 384
 385 /*
 386  * Fetch a list of revisions for a particular wiki page
 387  */
 388 void wiki_history(char *pagename) {
 389         int r;
 390         char history_page_name[270];
 391         long msgnum;
 392         struct CtdlMessage *msg;
 393
 394         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 395         if (r != om_ok) {
 396                 if (r == om_not_logged_in) {
 397                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 398                 }
 399                 else {
 400                         cprintf("%d An unknown error has occurred.\n", ERROR);
 401                 }
 402                 return;
 403         }
 404
 405         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 406         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 407         if (msgnum > 0L) {
 408                 msg = CtdlFetchMessage(msgnum, 1);
 409         }
 410         else {
 411                 msg = NULL;
 412         }
 413
 414         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 415                 CM_Free(msg);
 416                 msg = NULL;
 417         }
 418
 419         if (msg == NULL) {
 420                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 421                 return;
 422         }
 423
 424
 425         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 426         mime_parser(CM_RANGE(msg, eMesageText), *wiki_history_callback, NULL, NULL, NULL, 0);
 427         cprintf("000\n");
 428
 429         CM_Free(msg);
 430         return;
 431 }
 432
 433 /*
 434  * MIME Parser callback for wiki_rev()
 435  *
 436  * The "filename" field will contain a memo field, which includes (among other things)
 437  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 438  *
 439  * The "content" filed will contain "diff" output suitable for applying via "patch"
 440  * to our temporary file.
 441  */
 442 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 443                    void *content, char *cbtype, char *cbcharset, size_t length,
 444                    char *encoding, char *cbid, void *cbuserdata)
 445 {
 446         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 447         char memo[1024];
 448         char this_rev[256];
 449         FILE *fp;
 450         char *ptr = NULL;
 451         char buf[1024];
 452
 453         /* Did a previous callback already indicate that we've reached our target uuid?
 454          * If so, don't process anything else.
 455          */
 456         if (hecbd->done) {
 457                 return;
 458         }
 459
 460         CtdlDecodeBase64(memo, filename, strlen(filename));
 461         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 462         striplt(this_rev);
 463
 464         /* Perform the patch */
 465         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 466         if (fp) {
 467                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 468                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 469                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 470
 471                 ptr = (char *)content;
 472                 int linenum = 0;
 473                 do {
 474                         ++linenum;
 475                         ptr = memreadline(ptr, buf, sizeof buf);
 476                         if (*ptr != 0) {
 477                                 if (linenum <= 2) {
 478                                         /* skip the first two lines; they contain bogus filenames */
 479                                 }
 480                                 else {
 481                                         fprintf(fp, "%s\n", buf);
 482                                 }
 483                         }
 484                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 485                 if (pclose(fp) != 0) {
 486                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 487                 }
 488         }
 489
 490         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 491                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 492                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 493                 hecbd->done = 1;
 494         }
 495 }
 496
 497
 498 /*
 499  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 500  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 501  * to revert the currently active page to that revision.
 502  */
 503 void wiki_rev(char *pagename, char *rev, char *operation)
 504 {
 505         struct CitContext *CCC = CC;
 506         int r;
 507         char history_page_name[270];
 508         long msgnum;
 509         char temp[PATH_MAX];
 510         struct CtdlMessage *msg;
 511         FILE *fp;
 512         struct HistoryEraserCallBackData hecbd;
 513         long len = 0L;
 514         int rv;
 515
 516         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 517         if (r != om_ok) {
 518                 if (r == om_not_logged_in) {
 519                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 520                 }
 521                 else {
 522                         cprintf("%d An unknown error has occurred.\n", ERROR);
 523                 }
 524                 return;
 525         }
 526
 527         if (!strcasecmp(operation, "revert")) {
 528                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 529                 if (r != 0) {
 530                         cprintf("%d %s\n", r, temp);
 531                         return;
 532                 }
 533         }
 534
 535         /* Begin by fetching the current version of the page.  We're going to patch
 536          * backwards through the diffs until we get the one we want.
 537          */
 538         msgnum = CtdlLocateMessageByEuid(pagename, &CCC->room);
 539         if (msgnum > 0L) {
 540                 msg = CtdlFetchMessage(msgnum, 1);
 541         }
 542         else {
 543                 msg = NULL;
 544         }
 545
 546         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 547                 CM_Free(msg);
 548                 msg = NULL;
 549         }
 550
 551         if (msg == NULL) {
 552                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 553                 return;
 554         }
 555
 556         /* Output it to a temporary file */
 557
 558         CtdlMakeTempFileName(temp, sizeof temp);
 559         fp = fopen(temp, "w");
 560         if (fp != NULL) {
 561                 r = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 562                 fclose(fp);
 563         }
 564         else {
 565                 syslog(LOG_ERR, "%s: %m", temp);
 566         }
 567         CM_Free(msg);
 568
 569         /* Get the revision history */
 570
 571         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 572         msgnum = CtdlLocateMessageByEuid(history_page_name, &CCC->room);
 573         if (msgnum > 0L) {
 574                 msg = CtdlFetchMessage(msgnum, 1);
 575         }
 576         else {
 577                 msg = NULL;
 578         }
 579
 580         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 581                 CM_Free(msg);
 582                 msg = NULL;
 583         }
 584
 585         if (msg == NULL) {
 586                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 587                 return;
 588         }
 589
 590         /* Start patching backwards (newest to oldest) through the revision history until we
 591          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 592          */
 593
 594         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 595         hecbd.tempfilename = temp;
 596         hecbd.stop_when = rev;
 597         striplt(hecbd.stop_when);
 598
 599         mime_parser(CM_RANGE(msg, eMesageText), *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 600         CM_Free(msg);
 601
 602         /* Were we successful? */
 603         if (hecbd.done == 0) {
 604                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 605                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 606                 );
 607         }
 608
 609         /* We have the desired revision on disk.  Now do something with it. */
 610
 611         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 612                 msg = malloc(sizeof(struct CtdlMessage));
 613                 memset(msg, 0, sizeof(struct CtdlMessage));
 614                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 615                 msg->cm_anon_type = MES_NORMAL;
 616                 msg->cm_format_type = FMT_RFC822;
 617                 fp = fopen(temp, "r");
 618                 if (fp) {
 619                         char *msgbuf;
 620                         fseek(fp, 0L, SEEK_END);
 621                         len = ftell(fp);
 622                         fseek(fp, 0L, SEEK_SET);
 623                         msgbuf = malloc(len + 1);
 624                         rv = fread(msgbuf, len, 1, fp);
 625                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 626                         msgbuf[len] = '\0';
 627                         CM_SetAsField(msg, eMesageText, &msgbuf, len);
 628                         fclose(fp);
 629                 }
 630                 if (len <= 0) {
 631                         msgnum = (-1L);
 632                 }
 633                 else if (!strcasecmp(operation, "fetch")) {
 634                         CM_SetField(msg, eAuthor, HKEY("Citadel"));
 635                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 636                         msgnum = CtdlSubmitMsg(msg, NULL, wwm);         /* Store the revision here */
 637
 638                         /*
 639                          * WARNING: VILE SLEAZY HACK
 640                          * This will avoid the 'message xxx is not in this room' security error,
 641                          * but only if the client fetches the message we just generated immediately
 642                          * without first trying to perform other fetch operations.
 643                          */
 644                         if (CCC->cached_msglist != NULL) {
 645                                 free(CCC->cached_msglist);
 646                                 CCC->cached_msglist = NULL;
 647                                 CCC->cached_num_msgs = 0;
 648                         }
 649                         CCC->cached_msglist = malloc(sizeof(long));
 650                         if (CCC->cached_msglist != NULL) {
 651                                 CCC->cached_num_msgs = 1;
 652                                 CCC->cached_msglist[0] = msgnum;
 653                         }
 654
 655                 }
 656                 else if (!strcasecmp(operation, "revert")) {
 657                         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 658                         if (!IsEmptyStr(CCC->user.fullname)) {
 659                                 CM_SetField(msg, eAuthor, CCC->user.fullname, strlen(CCC->user.fullname));
 660                         }
 661
 662                         if (!IsEmptyStr(CCC->cs_inet_email)) {
 663                                 CM_SetField(msg, erFc822Addr, CCC->cs_inet_email, strlen(CCC->cs_inet_email));
 664                         }
 665
 666                         if (!IsEmptyStr(CCC->room.QRname)) {
 667                                 CM_SetField(msg, eOriginalRoom, CCC->room.QRname, strlen(CCC->room.QRname));
 668                         }
 669
 670                         if (!IsEmptyStr(pagename)) {
 671                                 CM_SetField(msg, eExclusiveID, pagename, strlen(pagename));
 672                         }
 673                         msgnum = CtdlSubmitMsg(msg, NULL, "");          /* Replace the current revision */
 674                 }
 675                 else {
 676                         /* Theoretically it is impossible to get here, but throw an error anyway */
 677                         msgnum = (-1L);
 678                 }
 679                 CM_Free(msg);
 680                 if (msgnum >= 0L) {
 681                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 682                 }
 683                 else {
 684                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 685                 }
 686         }
 687
 688         /* We did all this work for nothing.  Express anguish to the caller. */
 689         else {
 690                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 691         }
 692
 693         unlink(temp);
 694         return;
 695 }
 696
 697
 698
 699 /*
 700  * commands related to wiki management
 701  */
 702 void cmd_wiki(char *argbuf) {
 703         char subcmd[32];
 704         char pagename[256];
 705         char rev[128];
 706         char operation[16];
 707
 708         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 709
 710         if (!strcasecmp(subcmd, "history")) {
 711                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 712                 wiki_history(pagename);
 713                 return;
 714         }
 715
 716         if (!strcasecmp(subcmd, "rev")) {
 717                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 718                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 719                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 720                 wiki_rev(pagename, rev, operation);
 721                 return;
 722         }
 723
 724         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 725 }
 726
 727
 728
 729 /*
 730  * Module initialization
 731  */
 732 CTDL_MODULE_INIT(wiki)
 733 {
 734         if (!threading)
 735         {
 736                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 737                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 738         }
 739
 740         /* return our module name for the log */
 741         return "wiki";
 742 }