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 #include <time.h>
  26 #include <sys/wait.h>
  27 #include <string.h>
  28 #include <limits.h>
  29 #include <libcitadel.h>
  30 #include "citadel.h"
  31 #include "server.h"
  32 #include "citserver.h"
  33 #include "support.h"
  34 #include "config.h"
  35 #include "control.h"
  36 #include "user_ops.h"
  37 #include "room_ops.h"
  38 #include "database.h"
  39 #include "msgbase.h"
  40 #include "euidindex.h"
  41 #include "ctdl_module.h"
  42
  43 /*
  44  * Data passed back and forth between wiki_rev() and its MIME parser callback
  45  */
  46 struct HistoryEraserCallBackData {
  47         char *tempfilename;             /* name of temp file being patched */
  48         char *stop_when;                /* stop when we hit this uuid */
  49         int done;                       /* set to nonzero when we're done patching */
  50 };
  51
  52 /*
  53  * Name of the temporary room we create to store old revisions when someone requests them.
  54  * We put it in an invalid namespace so the DAP cleans up after us later.
  55  */
  56 char *wwm = "9999999999.WikiWaybackMachine";
  57
  58 /*
  59  * Before allowing a wiki page save to execute, we have to perform version control.
  60  * This involves fetching the old version of the page if it exists.
  61  */
  62 int wiki_upload_beforesave(struct CtdlMessage *msg, struct recptypes *recp) {
  63         struct CitContext *CCC = CC;
  64         long old_msgnum = (-1L);
  65         struct CtdlMessage *old_msg = NULL;
  66         long history_msgnum = (-1L);
  67         struct CtdlMessage *history_msg = NULL;
  68         char diff_old_filename[PATH_MAX];
  69         char diff_new_filename[PATH_MAX];
  70         char diff_out_filename[PATH_MAX];
  71         char diff_cmd[PATH_MAX];
  72         FILE *fp;
  73         int rv;
  74         char history_page[1024];
  75         long history_page_len;
  76         char boundary[256];
  77         char prefixed_boundary[258];
  78         char buf[1024];
  79         char *diffbuf = NULL;
  80         size_t diffbuf_len = 0;
  81         char *ptr = NULL;
  82         long newmsgid;
  83         StrBuf *msgidbuf;
  84
  85         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
  86
  87         /* Is this a room with a Wiki in it, don't run this hook. */
  88         if ((CCC->room.QRdefaultview != VIEW_WIKI) &&
  89             (CCC->room.QRdefaultview != VIEW_WIKIMD)) {
  90                 return(0);
  91         }
  92
  93         /* If this isn't a MIME message, don't bother. */
  94         if (msg->cm_format_type != 4) return(0);
  95
  96         /* If there's no EUID we can't do this.  Reject the post. */
  97         if (CM_IsEmpty(msg, eExclusiveID)) return(1);
  98
  99         newmsgid = get_new_message_number();
 100         msgidbuf = NewStrBuf();
 101         StrBufPrintf(msgidbuf, "%08lX-%08lX@%s/%s",
 102                      (long unsigned int) time(NULL),
 103                      (long unsigned int) newmsgid,
 104                      CtdlGetConfigStr("c_fqdn"),
 105                      msg->cm_fields[eExclusiveID]
 106                 );
 107
 108         CM_SetAsFieldSB(msg, emessageId, &msgidbuf);
 109
 110         history_page_len = snprintf(history_page, sizeof history_page,
 111                                     "%s_HISTORY_", msg->cm_fields[eExclusiveID]);
 112
 113         /* Make sure we're saving a real wiki page rather than a wiki history page.
 114          * This is important in order to avoid recursing infinitely into this hook.
 115          */
 116         if (    (msg->cm_lengths[eExclusiveID] >= 9)
 117                 && (!strcasecmp(&msg->cm_fields[eExclusiveID][msg->cm_lengths[eExclusiveID]-9], "_HISTORY_"))
 118         ) {
 119                 syslog(LOG_DEBUG, "History page not being historied\n");
 120                 return(0);
 121         }
 122
 123         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 124         if (CM_IsEmpty(msg, eMesageText)) return(0);
 125
 126         /* Set the message subject identical to the page name */
 127         CM_CopyField(msg, eMsgSubject, eExclusiveID);
 128
 129         /* See if we can retrieve the previous version. */
 130         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields[eExclusiveID], &CCC->room);
 131         if (old_msgnum > 0L) {
 132                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 133         }
 134         else {
 135                 old_msg = NULL;
 136         }
 137
 138         if ((old_msg != NULL) && (CM_IsEmpty(old_msg, eMesageText))) {  /* old version is corrupt? */
 139                 CM_Free(old_msg);
 140                 old_msg = NULL;
 141         }
 142
 143         /* If no changes were made, don't bother saving it again */
 144         if ((old_msg != NULL) && (!strcmp(msg->cm_fields[eMesageText], old_msg->cm_fields[eMesageText]))) {
 145                 CM_Free(old_msg);
 146                 return(1);
 147         }
 148
 149         /*
 150          * Generate diffs
 151          */
 152         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 153         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 154         CtdlMakeTempFileName(diff_out_filename, sizeof diff_out_filename);
 155
 156         if (old_msg != NULL) {
 157                 fp = fopen(diff_old_filename, "w");
 158                 rv = fwrite(old_msg->cm_fields[eMesageText], old_msg->cm_lengths[eMesageText], 1, fp);
 159                 fclose(fp);
 160                 CM_Free(old_msg);
 161         }
 162
 163         fp = fopen(diff_new_filename, "w");
 164         rv = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 165         fclose(fp);
 166
 167         snprintf(diff_cmd, sizeof diff_cmd,
 168                 DIFF " -u %s %s >%s",
 169                 diff_new_filename,
 170                 ((old_msg != NULL) ? diff_old_filename : "/dev/null"),
 171                 diff_out_filename
 172         );
 173         syslog(LOG_DEBUG, "diff cmd: %s", diff_cmd);
 174         rv = system(diff_cmd);
 175         syslog(LOG_DEBUG, "diff cmd returned %d", rv);
 176
 177         diffbuf_len = 0;
 178         diffbuf = NULL;
 179         fp = fopen(diff_out_filename, "r");
 180         if (fp == NULL) {
 181                 fp = fopen("/dev/null", "r");
 182         }
 183         if (fp != NULL) {
 184                 fseek(fp, 0L, SEEK_END);
 185                 diffbuf_len = ftell(fp);
 186                 fseek(fp, 0L, SEEK_SET);
 187                 diffbuf = malloc(diffbuf_len + 1);
 188                 fread(diffbuf, diffbuf_len, 1, fp);
 189                 diffbuf[diffbuf_len] = '\0';
 190                 fclose(fp);
 191         }
 192
 193         syslog(LOG_DEBUG, "diff length is "SIZE_T_FMT" bytes", diffbuf_len);
 194
 195         unlink(diff_old_filename);
 196         unlink(diff_new_filename);
 197         unlink(diff_out_filename);
 198
 199         /* Determine whether this was a bogus (empty) edit */
 200         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 201                 free(diffbuf);
 202                 diffbuf = NULL;
 203         }
 204         if (diffbuf == NULL) {
 205                 return(1);              /* No changes at all?  Abandon the post entirely! */
 206         }
 207
 208         /* Now look for the existing edit history */
 209
 210         history_msgnum = CtdlLocateMessageByEuid(history_page, &CCC->room);
 211         history_msg = NULL;
 212         if (history_msgnum > 0L) {
 213                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 214         }
 215
 216         /* Create a new history message if necessary */
 217         if (history_msg == NULL) {
 218                 char *buf;
 219                 long len;
 220
 221                 history_msg = malloc(sizeof(struct CtdlMessage));
 222                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 223                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 224                 history_msg->cm_anon_type = MES_NORMAL;
 225                 history_msg->cm_format_type = FMT_RFC822;
 226                 CM_SetField(history_msg, eAuthor, HKEY("Citadel"));
 227                 if (!IsEmptyStr(CCC->room.QRname)){
 228                         CM_SetField(history_msg, eRecipient, CCC->room.QRname, strlen(CCC->room.QRname));
 229                 }
 230                 CM_SetField(history_msg, eExclusiveID, history_page, history_page_len);
 231                 CM_SetField(history_msg, eMsgSubject, history_page, history_page_len);
 232                 CM_SetField(history_msg, eSuppressIdx, HKEY("1")); /* suppress full text indexing */
 233                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 234                 buf = (char*) malloc(1024);
 235                 len = snprintf(buf, 1024,
 236                                "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 237                                "This is a Citadel wiki history encoded as multipart MIME.\n"
 238                                "Each part is comprised of a diff script representing one change set.\n"
 239                                "\n"
 240                                "--%s--\n",
 241                                boundary, boundary
 242                 );
 243                 CM_SetAsField(history_msg, eMesageText, &buf, len);
 244         }
 245
 246         /* Update the history message (regardless of whether it's new or existing) */
 247
 248         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 249          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 250          */
 251         CM_FlushField(history_msg, emessageId);
 252
 253         /* Figure out the boundary string.  We do this even when we generated the
 254          * boundary string in the above code, just to be safe and consistent.
 255          */
 256         *boundary = '\0';
 257
 258         ptr = history_msg->cm_fields[eMesageText];
 259         do {
 260                 ptr = memreadline(ptr, buf, sizeof buf);
 261                 if (*ptr != 0) {
 262                         striplt(buf);
 263                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 264                                 if (
 265                                         (bmstrcasestr(buf, "multipart") != NULL)
 266                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 267                                 ) {
 268                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 269                                         char *qu;
 270                                         qu = strchr(boundary, '\"');
 271                                         if (qu) {
 272                                                 strcpy(boundary, ++qu);
 273                                         }
 274                                         qu = strchr(boundary, '\"');
 275                                         if (qu) {
 276                                                 *qu = 0;
 277                                         }
 278                                 }
 279                         }
 280                 }
 281         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 282
 283         /*
 284          * Now look for the first boundary.  That is where we need to insert our fun.
 285          */
 286         if (!IsEmptyStr(boundary)) {
 287                 char *MsgText;
 288                 long MsgTextLen;
 289                 time_t Now = time(NULL);
 290
 291                 snprintf(prefixed_boundary, sizeof(prefixed_boundary), "--%s", boundary);
 292
 293                 CM_GetAsField(history_msg, eMesageText, &MsgText, &MsgTextLen);
 294
 295                 ptr = bmstrcasestr(MsgText, prefixed_boundary);
 296                 if (ptr != NULL) {
 297                         StrBuf *NewMsgText;
 298                         char uuid[64];
 299                         char memo[512];
 300                         long memolen;
 301                         char encoded_memo[1024];
 302
 303                         NewMsgText = NewStrBufPlain(NULL, MsgTextLen + diffbuf_len + 1024);
 304
 305                         generate_uuid(uuid);
 306                         memolen = snprintf(memo, sizeof(memo), "%s|%ld|%s|%s",
 307                                            uuid,
 308                                            Now,
 309                                            CCC->user.fullname,
 310                                            CtdlGetConfigStr("c_nodename"));
 311
 312                         memolen = CtdlEncodeBase64(encoded_memo, memo, memolen, 0);
 313
 314                         StrBufAppendBufPlain(NewMsgText, HKEY("--"), 0);
 315                         StrBufAppendBufPlain(NewMsgText, boundary, -1, 0);
 316                         StrBufAppendBufPlain(
 317                                 NewMsgText,
 318                                 HKEY("\n"
 319                                      "Content-type: text/plain\n"
 320                                      "Content-Disposition: inline; filename=\""), 0);
 321
 322                         StrBufAppendBufPlain(NewMsgText, encoded_memo, memolen, 0);
 323
 324                         StrBufAppendBufPlain(
 325                                 NewMsgText,
 326                                 HKEY("\"\n"
 327                                      "Content-Transfer-Encoding: 8bit\n"
 328                                      "\n"), 0);
 329
 330                         StrBufAppendBufPlain(NewMsgText, diffbuf, diffbuf_len, 0);
 331                         StrBufAppendBufPlain(NewMsgText, HKEY("\n"), 0);
 332
 333                         StrBufAppendBufPlain(NewMsgText, ptr, MsgTextLen - (ptr - MsgText), 0);
 334                         free(MsgText);
 335                         CM_SetAsFieldSB(history_msg, eMesageText, &NewMsgText);
 336                 }
 337                 else
 338                 {
 339                         CM_SetAsField(history_msg, eMesageText, &MsgText, MsgTextLen);
 340                 }
 341
 342                 CM_SetFieldLONG(history_msg, eTimestamp, Now);
 343
 344                 CtdlSubmitMsg(history_msg, NULL, "");
 345         }
 346         else {
 347                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 348         }
 349
 350         free(diffbuf);
 351         CM_Free(history_msg);
 352         return(0);
 353 }
 354
 355
 356 /*
 357  * MIME Parser callback for wiki_history()
 358  *
 359  * The "filename" field will contain a memo field.  All we have to do is decode
 360  * the base64 and output it.  The data is already in a delimited format suitable
 361  * for our client protocol.
 362  */
 363 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 364                    void *content, char *cbtype, char *cbcharset, size_t length,
 365                    char *encoding, char *cbid, void *cbuserdata)
 366 {
 367         char memo[1024];
 368
 369         CtdlDecodeBase64(memo, filename, strlen(filename));
 370         cprintf("%s\n", memo);
 371 }
 372
 373
 374 /*
 375  * Fetch a list of revisions for a particular wiki page
 376  */
 377 void wiki_history(char *pagename) {
 378         int r;
 379         char history_page_name[270];
 380         long msgnum;
 381         struct CtdlMessage *msg;
 382
 383         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 384         if (r != om_ok) {
 385                 if (r == om_not_logged_in) {
 386                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 387                 }
 388                 else {
 389                         cprintf("%d An unknown error has occurred.\n", ERROR);
 390                 }
 391                 return;
 392         }
 393
 394         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 395         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 396         if (msgnum > 0L) {
 397                 msg = CtdlFetchMessage(msgnum, 1);
 398         }
 399         else {
 400                 msg = NULL;
 401         }
 402
 403         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 404                 CM_Free(msg);
 405                 msg = NULL;
 406         }
 407
 408         if (msg == NULL) {
 409                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 410                 return;
 411         }
 412
 413
 414         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 415         mime_parser(CM_RANGE(msg, eMesageText), *wiki_history_callback, NULL, NULL, NULL, 0);
 416         cprintf("000\n");
 417
 418         CM_Free(msg);
 419         return;
 420 }
 421
 422 /*
 423  * MIME Parser callback for wiki_rev()
 424  *
 425  * The "filename" field will contain a memo field, which includes (among other things)
 426  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 427  *
 428  * The "content" filed will contain "diff" output suitable for applying via "patch"
 429  * to our temporary file.
 430  */
 431 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 432                    void *content, char *cbtype, char *cbcharset, size_t length,
 433                    char *encoding, char *cbid, void *cbuserdata)
 434 {
 435         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 436         char memo[1024];
 437         char this_rev[256];
 438         FILE *fp;
 439         char *ptr = NULL;
 440         char buf[1024];
 441
 442         /* Did a previous callback already indicate that we've reached our target uuid?
 443          * If so, don't process anything else.
 444          */
 445         if (hecbd->done) {
 446                 return;
 447         }
 448
 449         CtdlDecodeBase64(memo, filename, strlen(filename));
 450         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 451         striplt(this_rev);
 452
 453         /* Perform the patch */
 454         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 455         if (fp) {
 456                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 457                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 458                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 459
 460                 ptr = (char *)content;
 461                 int linenum = 0;
 462                 do {
 463                         ++linenum;
 464                         ptr = memreadline(ptr, buf, sizeof buf);
 465                         if (*ptr != 0) {
 466                                 if (linenum <= 2) {
 467                                         /* skip the first two lines; they contain bogus filenames */
 468                                 }
 469                                 else {
 470                                         fprintf(fp, "%s\n", buf);
 471                                 }
 472                         }
 473                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 474                 if (pclose(fp) != 0) {
 475                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 476                 }
 477         }
 478
 479         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 480                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 481                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 482                 hecbd->done = 1;
 483         }
 484 }
 485
 486
 487 /*
 488  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 489  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 490  * to revert the currently active page to that revision.
 491  */
 492 void wiki_rev(char *pagename, char *rev, char *operation)
 493 {
 494         struct CitContext *CCC = CC;
 495         int r;
 496         char history_page_name[270];
 497         long msgnum;
 498         char temp[PATH_MAX];
 499         struct CtdlMessage *msg;
 500         FILE *fp;
 501         struct HistoryEraserCallBackData hecbd;
 502         long len = 0L;
 503         int rv;
 504
 505         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 506         if (r != om_ok) {
 507                 if (r == om_not_logged_in) {
 508                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 509                 }
 510                 else {
 511                         cprintf("%d An unknown error has occurred.\n", ERROR);
 512                 }
 513                 return;
 514         }
 515
 516         if (!strcasecmp(operation, "revert")) {
 517                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 518                 if (r != 0) {
 519                         cprintf("%d %s\n", r, temp);
 520                         return;
 521                 }
 522         }
 523
 524         /* Begin by fetching the current version of the page.  We're going to patch
 525          * backwards through the diffs until we get the one we want.
 526          */
 527         msgnum = CtdlLocateMessageByEuid(pagename, &CCC->room);
 528         if (msgnum > 0L) {
 529                 msg = CtdlFetchMessage(msgnum, 1);
 530         }
 531         else {
 532                 msg = NULL;
 533         }
 534
 535         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 536                 CM_Free(msg);
 537                 msg = NULL;
 538         }
 539
 540         if (msg == NULL) {
 541                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 542                 return;
 543         }
 544
 545         /* Output it to a temporary file */
 546
 547         CtdlMakeTempFileName(temp, sizeof temp);
 548         fp = fopen(temp, "w");
 549         if (fp != NULL) {
 550                 r = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 551                 fclose(fp);
 552         }
 553         else {
 554                 syslog(LOG_ERR, "%s: %m", temp);
 555         }
 556         CM_Free(msg);
 557
 558         /* Get the revision history */
 559
 560         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 561         msgnum = CtdlLocateMessageByEuid(history_page_name, &CCC->room);
 562         if (msgnum > 0L) {
 563                 msg = CtdlFetchMessage(msgnum, 1);
 564         }
 565         else {
 566                 msg = NULL;
 567         }
 568
 569         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 570                 CM_Free(msg);
 571                 msg = NULL;
 572         }
 573
 574         if (msg == NULL) {
 575                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 576                 return;
 577         }
 578
 579         /* Start patching backwards (newest to oldest) through the revision history until we
 580          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 581          */
 582
 583         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 584         hecbd.tempfilename = temp;
 585         hecbd.stop_when = rev;
 586         striplt(hecbd.stop_when);
 587
 588         mime_parser(CM_RANGE(msg, eMesageText), *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 589         CM_Free(msg);
 590
 591         /* Were we successful? */
 592         if (hecbd.done == 0) {
 593                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 594                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 595                 );
 596         }
 597
 598         /* We have the desired revision on disk.  Now do something with it. */
 599
 600         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 601                 msg = malloc(sizeof(struct CtdlMessage));
 602                 memset(msg, 0, sizeof(struct CtdlMessage));
 603                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 604                 msg->cm_anon_type = MES_NORMAL;
 605                 msg->cm_format_type = FMT_RFC822;
 606                 fp = fopen(temp, "r");
 607                 if (fp) {
 608                         char *msgbuf;
 609                         fseek(fp, 0L, SEEK_END);
 610                         len = ftell(fp);
 611                         fseek(fp, 0L, SEEK_SET);
 612                         msgbuf = malloc(len + 1);
 613                         rv = fread(msgbuf, len, 1, fp);
 614                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 615                         msgbuf[len] = '\0';
 616                         CM_SetAsField(msg, eMesageText, &msgbuf, len);
 617                         fclose(fp);
 618                 }
 619                 if (len <= 0) {
 620                         msgnum = (-1L);
 621                 }
 622                 else if (!strcasecmp(operation, "fetch")) {
 623                         CM_SetField(msg, eAuthor, HKEY("Citadel"));
 624                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 625                         msgnum = CtdlSubmitMsg(msg, NULL, wwm);         /* Store the revision here */
 626
 627                         /*
 628                          * WARNING: VILE SLEAZY HACK
 629                          * This will avoid the 'message xxx is not in this room' security error,
 630                          * but only if the client fetches the message we just generated immediately
 631                          * without first trying to perform other fetch operations.
 632                          */
 633                         if (CCC->cached_msglist != NULL) {
 634                                 free(CCC->cached_msglist);
 635                                 CCC->cached_msglist = NULL;
 636                                 CCC->cached_num_msgs = 0;
 637                         }
 638                         CCC->cached_msglist = malloc(sizeof(long));
 639                         if (CCC->cached_msglist != NULL) {
 640                                 CCC->cached_num_msgs = 1;
 641                                 CCC->cached_msglist[0] = msgnum;
 642                         }
 643
 644                 }
 645                 else if (!strcasecmp(operation, "revert")) {
 646                         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 647                         if (!IsEmptyStr(CCC->user.fullname)) {
 648                                 CM_SetField(msg, eAuthor, CCC->user.fullname, strlen(CCC->user.fullname));
 649                         }
 650
 651                         if (!IsEmptyStr(CCC->cs_inet_email)) {
 652                                 CM_SetField(msg, erFc822Addr, CCC->cs_inet_email, strlen(CCC->cs_inet_email));
 653                         }
 654
 655                         if (!IsEmptyStr(CCC->room.QRname)) {
 656                                 CM_SetField(msg, eOriginalRoom, CCC->room.QRname, strlen(CCC->room.QRname));
 657                         }
 658
 659                         if (!IsEmptyStr(pagename)) {
 660                                 CM_SetField(msg, eExclusiveID, pagename, strlen(pagename));
 661                         }
 662                         msgnum = CtdlSubmitMsg(msg, NULL, "");          /* Replace the current revision */
 663                 }
 664                 else {
 665                         /* Theoretically it is impossible to get here, but throw an error anyway */
 666                         msgnum = (-1L);
 667                 }
 668                 CM_Free(msg);
 669                 if (msgnum >= 0L) {
 670                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 671                 }
 672                 else {
 673                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 674                 }
 675         }
 676
 677         /* We did all this work for nothing.  Express anguish to the caller. */
 678         else {
 679                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 680         }
 681
 682         unlink(temp);
 683         return;
 684 }
 685
 686
 687
 688 /*
 689  * commands related to wiki management
 690  */
 691 void cmd_wiki(char *argbuf) {
 692         char subcmd[32];
 693         char pagename[256];
 694         char rev[128];
 695         char operation[16];
 696
 697         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 698
 699         if (!strcasecmp(subcmd, "history")) {
 700                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 701                 wiki_history(pagename);
 702                 return;
 703         }
 704
 705         if (!strcasecmp(subcmd, "rev")) {
 706                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 707                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 708                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 709                 wiki_rev(pagename, rev, operation);
 710                 return;
 711         }
 712
 713         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 714 }
 715
 716
 717
 718 /*
 719  * Module initialization
 720  */
 721 CTDL_MODULE_INIT(wiki)
 722 {
 723         if (!threading)
 724         {
 725                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 726                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 727         }
 728
 729         /* return our module name for the log */
 730         return "wiki";
 731 }