citadel/modules/wiki/serv_wiki.c

   1 /*
   2  * Server-side module for Wiki rooms.  This handles things like version control.
   3  *
   4  * Copyright (c) 2009-2021 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         long old_msgnum = (-1L);
  64         struct CtdlMessage *old_msg = NULL;
  65         long history_msgnum = (-1L);
  66         struct CtdlMessage *history_msg = NULL;
  67         char diff_old_filename[PATH_MAX];
  68         char diff_new_filename[PATH_MAX];
  69         char diff_out_filename[PATH_MAX];
  70         char diff_cmd[PATH_MAX];
  71         FILE *fp;
  72         int rv;
  73         char history_page[1024];
  74         long history_page_len;
  75         char boundary[256];
  76         char prefixed_boundary[258];
  77         char buf[1024];
  78         char *diffbuf = NULL;
  79         size_t diffbuf_len = 0;
  80         char *ptr = NULL;
  81         long newmsgid;
  82         StrBuf *msgidbuf;
  83
  84         if (!CC->logged_in) return(0);  /* Only do this if logged in. */
  85
  86         /* Is this a room with a Wiki in it, don't run this hook. */
  87         if (CC->room.QRdefaultview != VIEW_WIKI) {
  88                 return(0);
  89         }
  90
  91         /* If this isn't a MIME message, don't bother. */
  92         if (msg->cm_format_type != 4) return(0);
  93
  94         /* If there's no EUID we can't do this.  Reject the post. */
  95         if (CM_IsEmpty(msg, eExclusiveID)) return(1);
  96
  97         newmsgid = get_new_message_number();
  98         msgidbuf = NewStrBuf();
  99         StrBufPrintf(msgidbuf, "%08lX-%08lX@%s/%s",
 100                      (long unsigned int) time(NULL),
 101                      (long unsigned int) newmsgid,
 102                      CtdlGetConfigStr("c_fqdn"),
 103                      msg->cm_fields[eExclusiveID]
 104                 );
 105
 106         CM_SetAsFieldSB(msg, emessageId, &msgidbuf);
 107
 108         history_page_len = snprintf(history_page, sizeof history_page,
 109                                     "%s_HISTORY_", msg->cm_fields[eExclusiveID]);
 110
 111         /* Make sure we're saving a real wiki page rather than a wiki history page.
 112          * This is important in order to avoid recursing infinitely into this hook.
 113          */
 114         if (    (msg->cm_lengths[eExclusiveID] >= 9)
 115                 && (!strcasecmp(&msg->cm_fields[eExclusiveID][msg->cm_lengths[eExclusiveID]-9], "_HISTORY_"))
 116         ) {
 117                 syslog(LOG_DEBUG, "History page not being historied\n");
 118                 return(0);
 119         }
 120
 121         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 122         if (CM_IsEmpty(msg, eMesageText)) return(0);
 123
 124         /* Set the message subject identical to the page name */
 125         CM_CopyField(msg, eMsgSubject, eExclusiveID);
 126
 127         /* See if we can retrieve the previous version. */
 128         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields[eExclusiveID], &CC->room);
 129         if (old_msgnum > 0L) {
 130                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 131         }
 132         else {
 133                 old_msg = NULL;
 134         }
 135
 136         if ((old_msg != NULL) && (CM_IsEmpty(old_msg, eMesageText))) {  /* old version is corrupt? */
 137                 CM_Free(old_msg);
 138                 old_msg = NULL;
 139         }
 140
 141         /* If no changes were made, don't bother saving it again */
 142         if ((old_msg != NULL) && (!strcmp(msg->cm_fields[eMesageText], old_msg->cm_fields[eMesageText]))) {
 143                 CM_Free(old_msg);
 144                 return(1);
 145         }
 146
 147         /*
 148          * Generate diffs
 149          */
 150         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 151         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 152         CtdlMakeTempFileName(diff_out_filename, sizeof diff_out_filename);
 153
 154         if (old_msg != NULL) {
 155                 fp = fopen(diff_old_filename, "w");
 156                 rv = fwrite(old_msg->cm_fields[eMesageText], old_msg->cm_lengths[eMesageText], 1, fp);
 157                 fclose(fp);
 158                 CM_Free(old_msg);
 159         }
 160
 161         fp = fopen(diff_new_filename, "w");
 162         rv = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 163         fclose(fp);
 164
 165         snprintf(diff_cmd, sizeof diff_cmd,
 166                 DIFF " -u %s %s >%s",
 167                 diff_new_filename,
 168                 ((old_msg != NULL) ? diff_old_filename : "/dev/null"),
 169                 diff_out_filename
 170         );
 171         syslog(LOG_DEBUG, "diff cmd: %s", diff_cmd);
 172         rv = system(diff_cmd);
 173         syslog(LOG_DEBUG, "diff cmd returned %d", rv);
 174
 175         diffbuf_len = 0;
 176         diffbuf = NULL;
 177         fp = fopen(diff_out_filename, "r");
 178         if (fp == NULL) {
 179                 fp = fopen("/dev/null", "r");
 180         }
 181         if (fp != NULL) {
 182                 fseek(fp, 0L, SEEK_END);
 183                 diffbuf_len = ftell(fp);
 184                 fseek(fp, 0L, SEEK_SET);
 185                 diffbuf = malloc(diffbuf_len + 1);
 186                 fread(diffbuf, diffbuf_len, 1, fp);
 187                 diffbuf[diffbuf_len] = '\0';
 188                 fclose(fp);
 189         }
 190
 191         syslog(LOG_DEBUG, "diff length is "SIZE_T_FMT" bytes", diffbuf_len);
 192
 193         unlink(diff_old_filename);
 194         unlink(diff_new_filename);
 195         unlink(diff_out_filename);
 196
 197         /* Determine whether this was a bogus (empty) edit */
 198         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 199                 free(diffbuf);
 200                 diffbuf = NULL;
 201         }
 202         if (diffbuf == NULL) {
 203                 return(1);              /* No changes at all?  Abandon the post entirely! */
 204         }
 205
 206         /* Now look for the existing edit history */
 207
 208         history_msgnum = CtdlLocateMessageByEuid(history_page, &CC->room);
 209         history_msg = NULL;
 210         if (history_msgnum > 0L) {
 211                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 212         }
 213
 214         /* Create a new history message if necessary */
 215         if (history_msg == NULL) {
 216                 char *buf;
 217                 long len;
 218
 219                 history_msg = malloc(sizeof(struct CtdlMessage));
 220                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 221                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 222                 history_msg->cm_anon_type = MES_NORMAL;
 223                 history_msg->cm_format_type = FMT_RFC822;
 224                 CM_SetField(history_msg, eAuthor, HKEY("Citadel"));
 225                 if (!IsEmptyStr(CC->room.QRname)){
 226                         CM_SetField(history_msg, eRecipient, CC->room.QRname, strlen(CC->room.QRname));
 227                 }
 228                 CM_SetField(history_msg, eExclusiveID, history_page, history_page_len);
 229                 CM_SetField(history_msg, eMsgSubject, history_page, history_page_len);
 230                 CM_SetField(history_msg, eSuppressIdx, HKEY("1")); /* suppress full text indexing */
 231                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 232                 buf = (char*) malloc(1024);
 233                 len = snprintf(buf, 1024,
 234                                "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 235                                "This is a Citadel wiki history encoded as multipart MIME.\n"
 236                                "Each part is comprised of a diff script representing one change set.\n"
 237                                "\n"
 238                                "--%s--\n",
 239                                boundary, boundary
 240                 );
 241                 CM_SetAsField(history_msg, eMesageText, &buf, len);
 242         }
 243
 244         /* Update the history message (regardless of whether it's new or existing) */
 245
 246         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 247          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 248          */
 249         CM_FlushField(history_msg, emessageId);
 250
 251         /* Figure out the boundary string.  We do this even when we generated the
 252          * boundary string in the above code, just to be safe and consistent.
 253          */
 254         *boundary = '\0';
 255
 256         ptr = history_msg->cm_fields[eMesageText];
 257         do {
 258                 ptr = memreadline(ptr, buf, sizeof buf);
 259                 if (*ptr != 0) {
 260                         striplt(buf);
 261                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 262                                 if (
 263                                         (bmstrcasestr(buf, "multipart") != NULL)
 264                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 265                                 ) {
 266                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 267                                         char *qu;
 268                                         qu = strchr(boundary, '\"');
 269                                         if (qu) {
 270                                                 strcpy(boundary, ++qu);
 271                                         }
 272                                         qu = strchr(boundary, '\"');
 273                                         if (qu) {
 274                                                 *qu = 0;
 275                                         }
 276                                 }
 277                         }
 278                 }
 279         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 280
 281         /*
 282          * Now look for the first boundary.  That is where we need to insert our fun.
 283          */
 284         if (!IsEmptyStr(boundary)) {
 285                 char *MsgText;
 286                 long MsgTextLen;
 287                 time_t Now = time(NULL);
 288
 289                 snprintf(prefixed_boundary, sizeof(prefixed_boundary), "--%s", boundary);
 290
 291                 CM_GetAsField(history_msg, eMesageText, &MsgText, &MsgTextLen);
 292
 293                 ptr = bmstrcasestr(MsgText, prefixed_boundary);
 294                 if (ptr != NULL) {
 295                         StrBuf *NewMsgText;
 296                         char uuid[64];
 297                         char memo[512];
 298                         long memolen;
 299                         char encoded_memo[1024];
 300
 301                         NewMsgText = NewStrBufPlain(NULL, MsgTextLen + diffbuf_len + 1024);
 302
 303                         generate_uuid(uuid);
 304                         memolen = snprintf(memo, sizeof(memo), "%s|%ld|%s|%s",
 305                                            uuid,
 306                                            Now,
 307                                            CC->user.fullname,
 308                                            CtdlGetConfigStr("c_nodename"));
 309
 310                         memolen = CtdlEncodeBase64(encoded_memo, memo, memolen, 0);
 311
 312                         StrBufAppendBufPlain(NewMsgText, HKEY("--"), 0);
 313                         StrBufAppendBufPlain(NewMsgText, boundary, -1, 0);
 314                         StrBufAppendBufPlain(
 315                                 NewMsgText,
 316                                 HKEY("\n"
 317                                      "Content-type: text/plain\n"
 318                                      "Content-Disposition: inline; filename=\""), 0);
 319
 320                         StrBufAppendBufPlain(NewMsgText, encoded_memo, memolen, 0);
 321
 322                         StrBufAppendBufPlain(
 323                                 NewMsgText,
 324                                 HKEY("\"\n"
 325                                      "Content-Transfer-Encoding: 8bit\n"
 326                                      "\n"), 0);
 327
 328                         StrBufAppendBufPlain(NewMsgText, diffbuf, diffbuf_len, 0);
 329                         StrBufAppendBufPlain(NewMsgText, HKEY("\n"), 0);
 330
 331                         StrBufAppendBufPlain(NewMsgText, ptr, MsgTextLen - (ptr - MsgText), 0);
 332                         free(MsgText);
 333                         CM_SetAsFieldSB(history_msg, eMesageText, &NewMsgText);
 334                 }
 335                 else
 336                 {
 337                         CM_SetAsField(history_msg, eMesageText, &MsgText, MsgTextLen);
 338                 }
 339
 340                 CM_SetFieldLONG(history_msg, eTimestamp, Now);
 341
 342                 CtdlSubmitMsg(history_msg, NULL, "");
 343         }
 344         else {
 345                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 346         }
 347
 348         free(diffbuf);
 349         CM_Free(history_msg);
 350         return(0);
 351 }
 352
 353
 354 /*
 355  * MIME Parser callback for wiki_history()
 356  *
 357  * The "filename" field will contain a memo field.  All we have to do is decode
 358  * the base64 and output it.  The data is already in a delimited format suitable
 359  * for our client protocol.
 360  */
 361 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 362                    void *content, char *cbtype, char *cbcharset, size_t length,
 363                    char *encoding, char *cbid, void *cbuserdata)
 364 {
 365         char memo[1024];
 366
 367         CtdlDecodeBase64(memo, filename, strlen(filename));
 368         cprintf("%s\n", memo);
 369 }
 370
 371
 372 /*
 373  * Fetch a list of revisions for a particular wiki page
 374  */
 375 void wiki_history(char *pagename) {
 376         int r;
 377         char history_page_name[270];
 378         long msgnum;
 379         struct CtdlMessage *msg;
 380
 381         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 382         if (r != om_ok) {
 383                 if (r == om_not_logged_in) {
 384                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 385                 }
 386                 else {
 387                         cprintf("%d An unknown error has occurred.\n", ERROR);
 388                 }
 389                 return;
 390         }
 391
 392         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 393         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 394         if (msgnum > 0L) {
 395                 msg = CtdlFetchMessage(msgnum, 1);
 396         }
 397         else {
 398                 msg = NULL;
 399         }
 400
 401         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 402                 CM_Free(msg);
 403                 msg = NULL;
 404         }
 405
 406         if (msg == NULL) {
 407                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 408                 return;
 409         }
 410
 411
 412         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 413         mime_parser(CM_RANGE(msg, eMesageText), *wiki_history_callback, NULL, NULL, NULL, 0);
 414         cprintf("000\n");
 415
 416         CM_Free(msg);
 417         return;
 418 }
 419
 420 /*
 421  * MIME Parser callback for wiki_rev()
 422  *
 423  * The "filename" field will contain a memo field, which includes (among other things)
 424  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 425  *
 426  * The "content" filed will contain "diff" output suitable for applying via "patch"
 427  * to our temporary file.
 428  */
 429 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 430                    void *content, char *cbtype, char *cbcharset, size_t length,
 431                    char *encoding, char *cbid, void *cbuserdata)
 432 {
 433         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 434         char memo[1024];
 435         char this_rev[256];
 436         FILE *fp;
 437         char *ptr = NULL;
 438         char buf[1024];
 439
 440         /* Did a previous callback already indicate that we've reached our target uuid?
 441          * If so, don't process anything else.
 442          */
 443         if (hecbd->done) {
 444                 return;
 445         }
 446
 447         CtdlDecodeBase64(memo, filename, strlen(filename));
 448         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 449         striplt(this_rev);
 450
 451         /* Perform the patch */
 452         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 453         if (fp) {
 454                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 455                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 456                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 457
 458                 ptr = (char *)content;
 459                 int linenum = 0;
 460                 do {
 461                         ++linenum;
 462                         ptr = memreadline(ptr, buf, sizeof buf);
 463                         if (*ptr != 0) {
 464                                 if (linenum <= 2) {
 465                                         /* skip the first two lines; they contain bogus filenames */
 466                                 }
 467                                 else {
 468                                         fprintf(fp, "%s\n", buf);
 469                                 }
 470                         }
 471                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 472                 if (pclose(fp) != 0) {
 473                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 474                 }
 475         }
 476
 477         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 478                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 479                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 480                 hecbd->done = 1;
 481         }
 482 }
 483
 484
 485 /*
 486  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 487  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 488  * to revert the currently active page to that revision.
 489  */
 490 void wiki_rev(char *pagename, char *rev, char *operation)
 491 {
 492         int r;
 493         char history_page_name[270];
 494         long msgnum;
 495         char temp[PATH_MAX];
 496         struct CtdlMessage *msg;
 497         FILE *fp;
 498         struct HistoryEraserCallBackData hecbd;
 499         long len = 0L;
 500         int rv;
 501
 502         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 503         if (r != om_ok) {
 504                 if (r == om_not_logged_in) {
 505                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 506                 }
 507                 else {
 508                         cprintf("%d An unknown error has occurred.\n", ERROR);
 509                 }
 510                 return;
 511         }
 512
 513         if (!strcasecmp(operation, "revert")) {
 514                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 515                 if (r != 0) {
 516                         cprintf("%d %s\n", r, temp);
 517                         return;
 518                 }
 519         }
 520
 521         /* Begin by fetching the current version of the page.  We're going to patch
 522          * backwards through the diffs until we get the one we want.
 523          */
 524         msgnum = CtdlLocateMessageByEuid(pagename, &CC->room);
 525         if (msgnum > 0L) {
 526                 msg = CtdlFetchMessage(msgnum, 1);
 527         }
 528         else {
 529                 msg = NULL;
 530         }
 531
 532         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 533                 CM_Free(msg);
 534                 msg = NULL;
 535         }
 536
 537         if (msg == NULL) {
 538                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 539                 return;
 540         }
 541
 542         /* Output it to a temporary file */
 543
 544         CtdlMakeTempFileName(temp, sizeof temp);
 545         fp = fopen(temp, "w");
 546         if (fp != NULL) {
 547                 r = fwrite(msg->cm_fields[eMesageText], msg->cm_lengths[eMesageText], 1, fp);
 548                 fclose(fp);
 549         }
 550         else {
 551                 syslog(LOG_ERR, "%s: %m", temp);
 552         }
 553         CM_Free(msg);
 554
 555         /* Get the revision history */
 556
 557         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 558         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 559         if (msgnum > 0L) {
 560                 msg = CtdlFetchMessage(msgnum, 1);
 561         }
 562         else {
 563                 msg = NULL;
 564         }
 565
 566         if ((msg != NULL) && CM_IsEmpty(msg, eMesageText)) {
 567                 CM_Free(msg);
 568                 msg = NULL;
 569         }
 570
 571         if (msg == NULL) {
 572                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 573                 return;
 574         }
 575
 576         /* Start patching backwards (newest to oldest) through the revision history until we
 577          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 578          */
 579
 580         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 581         hecbd.tempfilename = temp;
 582         hecbd.stop_when = rev;
 583         striplt(hecbd.stop_when);
 584
 585         mime_parser(CM_RANGE(msg, eMesageText), *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 586         CM_Free(msg);
 587
 588         /* Were we successful? */
 589         if (hecbd.done == 0) {
 590                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 591                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 592                 );
 593         }
 594
 595         /* We have the desired revision on disk.  Now do something with it. */
 596
 597         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 598                 msg = malloc(sizeof(struct CtdlMessage));
 599                 memset(msg, 0, sizeof(struct CtdlMessage));
 600                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 601                 msg->cm_anon_type = MES_NORMAL;
 602                 msg->cm_format_type = FMT_RFC822;
 603                 fp = fopen(temp, "r");
 604                 if (fp) {
 605                         char *msgbuf;
 606                         fseek(fp, 0L, SEEK_END);
 607                         len = ftell(fp);
 608                         fseek(fp, 0L, SEEK_SET);
 609                         msgbuf = malloc(len + 1);
 610                         rv = fread(msgbuf, len, 1, fp);
 611                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 612                         msgbuf[len] = '\0';
 613                         CM_SetAsField(msg, eMesageText, &msgbuf, len);
 614                         fclose(fp);
 615                 }
 616                 if (len <= 0) {
 617                         msgnum = (-1L);
 618                 }
 619                 else if (!strcasecmp(operation, "fetch")) {
 620                         CM_SetField(msg, eAuthor, HKEY("Citadel"));
 621                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 622                         msgnum = CtdlSubmitMsg(msg, NULL, wwm);         /* Store the revision here */
 623
 624                         /*
 625                          * WARNING: VILE SLEAZY HACK
 626                          * This will avoid the 'message xxx is not in this room' security error,
 627                          * but only if the client fetches the message we just generated immediately
 628                          * without first trying to perform other fetch operations.
 629                          */
 630                         if (CC->cached_msglist != NULL) {
 631                                 free(CC->cached_msglist);
 632                                 CC->cached_msglist = NULL;
 633                                 CC->cached_num_msgs = 0;
 634                         }
 635                         CC->cached_msglist = malloc(sizeof(long));
 636                         if (CC->cached_msglist != NULL) {
 637                                 CC->cached_num_msgs = 1;
 638                                 CC->cached_msglist[0] = msgnum;
 639                         }
 640
 641                 }
 642                 else if (!strcasecmp(operation, "revert")) {
 643                         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 644                         if (!IsEmptyStr(CC->user.fullname)) {
 645                                 CM_SetField(msg, eAuthor, CC->user.fullname, strlen(CC->user.fullname));
 646                         }
 647
 648                         if (!IsEmptyStr(CC->cs_inet_email)) {
 649                                 CM_SetField(msg, erFc822Addr, CC->cs_inet_email, strlen(CC->cs_inet_email));
 650                         }
 651
 652                         if (!IsEmptyStr(CC->room.QRname)) {
 653                                 CM_SetField(msg, eOriginalRoom, CC->room.QRname, strlen(CC->room.QRname));
 654                         }
 655
 656                         if (!IsEmptyStr(pagename)) {
 657                                 CM_SetField(msg, eExclusiveID, pagename, strlen(pagename));
 658                         }
 659                         msgnum = CtdlSubmitMsg(msg, NULL, "");          /* Replace the current revision */
 660                 }
 661                 else {
 662                         /* Theoretically it is impossible to get here, but throw an error anyway */
 663                         msgnum = (-1L);
 664                 }
 665                 CM_Free(msg);
 666                 if (msgnum >= 0L) {
 667                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 668                 }
 669                 else {
 670                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 671                 }
 672         }
 673
 674         /* We did all this work for nothing.  Express anguish to the caller. */
 675         else {
 676                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 677         }
 678
 679         unlink(temp);
 680         return;
 681 }
 682
 683
 684
 685 /*
 686  * commands related to wiki management
 687  */
 688 void cmd_wiki(char *argbuf) {
 689         char subcmd[32];
 690         char pagename[256];
 691         char rev[128];
 692         char operation[16];
 693
 694         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 695
 696         if (!strcasecmp(subcmd, "history")) {
 697                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 698                 wiki_history(pagename);
 699                 return;
 700         }
 701
 702         if (!strcasecmp(subcmd, "rev")) {
 703                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 704                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 705                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 706                 wiki_rev(pagename, rev, operation);
 707                 return;
 708         }
 709
 710         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 711 }
 712
 713
 714
 715 /*
 716  * Module initialization
 717  */
 718 CTDL_MODULE_INIT(wiki)
 719 {
 720         if (!threading)
 721         {
 722                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 723                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 724         }
 725
 726         /* return our module name for the log */
 727         return "wiki";
 728 }