citadel/modules/wiki/serv_wiki.c

   1 /*
   2  * Server-side module for Wiki rooms.  This handles things like version control.
   3  *
   4  * Copyright (c) 2009-2012 by the citadel.org team
   5  *
   6  * This program is open source software.  You can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License, version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <signal.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <ctype.h>
  24 #include <sys/types.h>
  25
  26 #if TIME_WITH_SYS_TIME
  27 # include <sys/time.h>
  28 # include <time.h>
  29 #else
  30 # if HAVE_SYS_TIME_H
  31 #  include <sys/time.h>
  32 # else
  33 #  include <time.h>
  34 # endif
  35 #endif
  36
  37 #include <sys/wait.h>
  38 #include <string.h>
  39 #include <limits.h>
  40 #include <libcitadel.h>
  41 #include "citadel.h"
  42 #include "server.h"
  43 #include "citserver.h"
  44 #include "support.h"
  45 #include "config.h"
  46 #include "control.h"
  47 #include "user_ops.h"
  48 #include "database.h"
  49 #include "msgbase.h"
  50 #include "euidindex.h"
  51 #include "ctdl_module.h"
  52
  53 /*
  54  * Data passed back and forth between wiki_rev() and its MIME parser callback
  55  */
  56 struct HistoryEraserCallBackData {
  57         char *tempfilename;             /* name of temp file being patched */
  58         char *stop_when;                /* stop when we hit this uuid */
  59         int done;                       /* set to nonzero when we're done patching */
  60 };
  61
  62 /*
  63  * Name of the temporary room we create to store old revisions when someone requests them.
  64  * We put it in an invalid namespace so the DAP cleans up after us later.
  65  */
  66 char *wwm = "9999999999.WikiWaybackMachine";
  67
  68 /*
  69  * Before allowing a wiki page save to execute, we have to perform version control.
  70  * This involves fetching the old version of the page if it exists.
  71  */
  72 int wiki_upload_beforesave(struct CtdlMessage *msg) {
  73         struct CitContext *CCC = CC;
  74         long old_msgnum = (-1L);
  75         struct CtdlMessage *old_msg = NULL;
  76         long history_msgnum = (-1L);
  77         struct CtdlMessage *history_msg = NULL;
  78         char diff_old_filename[PATH_MAX];
  79         char diff_new_filename[PATH_MAX];
  80         char diff_out_filename[PATH_MAX];
  81         char diff_cmd[PATH_MAX];
  82         FILE *fp;
  83         int rv;
  84         char history_page[1024];
  85         long history_page_len;
  86         char boundary[256];
  87         char prefixed_boundary[258];
  88         char buf[1024];
  89         char *diffbuf = NULL;
  90         size_t diffbuf_len = 0;
  91         char *ptr = NULL;
  92
  93         if (!CCC->logged_in) return(0); /* Only do this if logged in. */
  94
  95         /* Is this a room with a Wiki in it, don't run this hook. */
  96         if (CCC->room.QRdefaultview != VIEW_WIKI) {
  97                 return(0);
  98         }
  99
 100         /* If this isn't a MIME message, don't bother. */
 101         if (msg->cm_format_type != 4) return(0);
 102
 103         /* If there's no EUID we can't do this.  Reject the post. */
 104         if (msg->cm_fields[eExclusiveID] == NULL) return(1);
 105
 106         history_page_len = snprintf(history_page, sizeof history_page,
 107                                     "%s_HISTORY_", msg->cm_fields[eExclusiveID]);
 108
 109         /* Make sure we're saving a real wiki page rather than a wiki history page.
 110          * This is important in order to avoid recursing infinitely into this hook.
 111          */
 112         if (    (strlen(msg->cm_fields[eExclusiveID]) >= 9)
 113                 && (!strcasecmp(&msg->cm_fields[eExclusiveID][strlen(msg->cm_fields[eExclusiveID])-9], "_HISTORY_"))
 114         ) {
 115                 syslog(LOG_DEBUG, "History page not being historied\n");
 116                 return(0);
 117         }
 118
 119         /* If there's no message text, obviously this is all b0rken and shouldn't happen at all */
 120         if (msg->cm_fields[eMesageText] == NULL) return(0);
 121
 122         /* Set the message subject identical to the page name */
 123         CM_CopyField(msg, eMsgSubject, eExclusiveID);
 124
 125         /* See if we can retrieve the previous version. */
 126         old_msgnum = CtdlLocateMessageByEuid(msg->cm_fields[eExclusiveID], &CCC->room);
 127         if (old_msgnum > 0L) {
 128                 old_msg = CtdlFetchMessage(old_msgnum, 1);
 129         }
 130         else {
 131                 old_msg = NULL;
 132         }
 133
 134         if ((old_msg != NULL) && (old_msg->cm_fields[eMesageText] == NULL)) {   /* old version is corrupt? */
 135                 CtdlFreeMessage(old_msg);
 136                 old_msg = NULL;
 137         }
 138
 139         /* If no changes were made, don't bother saving it again */
 140         if ((old_msg != NULL) && (!strcmp(msg->cm_fields[eMesageText], old_msg->cm_fields[eMesageText]))) {
 141                 CtdlFreeMessage(old_msg);
 142                 return(1);
 143         }
 144
 145         /*
 146          * Generate diffs
 147          */
 148         CtdlMakeTempFileName(diff_old_filename, sizeof diff_old_filename);
 149         CtdlMakeTempFileName(diff_new_filename, sizeof diff_new_filename);
 150         CtdlMakeTempFileName(diff_out_filename, sizeof diff_out_filename);
 151
 152         if (old_msg != NULL) {
 153                 fp = fopen(diff_old_filename, "w");
 154                 rv = fwrite(old_msg->cm_fields[eMesageText], strlen(old_msg->cm_fields[eMesageText]), 1, fp);
 155                 fclose(fp);
 156                 CtdlFreeMessage(old_msg);
 157         }
 158
 159         fp = fopen(diff_new_filename, "w");
 160         rv = fwrite(msg->cm_fields[eMesageText], strlen(msg->cm_fields[eMesageText]), 1, fp);
 161         fclose(fp);
 162
 163         snprintf(diff_cmd, sizeof diff_cmd,
 164                 DIFF " -u %s %s >%s",
 165                 diff_new_filename,
 166                 ((old_msg != NULL) ? diff_old_filename : "/dev/null"),
 167                 diff_out_filename
 168         );
 169         syslog(LOG_DEBUG, "diff cmd: %s", diff_cmd);
 170         rv = system(diff_cmd);
 171         syslog(LOG_DEBUG, "diff cmd returned %d", rv);
 172
 173         diffbuf_len = 0;
 174         diffbuf = NULL;
 175         fp = fopen(diff_out_filename, "r");
 176         if (fp == NULL) {
 177                 fp = fopen("/dev/null", "r");
 178         }
 179         if (fp != NULL) {
 180                 fseek(fp, 0L, SEEK_END);
 181                 diffbuf_len = ftell(fp);
 182                 fseek(fp, 0L, SEEK_SET);
 183                 diffbuf = malloc(diffbuf_len + 1);
 184                 fread(diffbuf, diffbuf_len, 1, fp);
 185                 diffbuf[diffbuf_len] = '\0';
 186                 fclose(fp);
 187         }
 188
 189         syslog(LOG_DEBUG, "diff length is "SIZE_T_FMT" bytes", diffbuf_len);
 190
 191         unlink(diff_old_filename);
 192         unlink(diff_new_filename);
 193         unlink(diff_out_filename);
 194
 195         /* Determine whether this was a bogus (empty) edit */
 196         if ((diffbuf_len = 0) && (diffbuf != NULL)) {
 197                 free(diffbuf);
 198                 diffbuf = NULL;
 199         }
 200         if (diffbuf == NULL) {
 201                 return(1);              /* No changes at all?  Abandon the post entirely! */
 202         }
 203
 204         /* Now look for the existing edit history */
 205
 206         history_msgnum = CtdlLocateMessageByEuid(history_page, &CCC->room);
 207         history_msg = NULL;
 208         if (history_msgnum > 0L) {
 209                 history_msg = CtdlFetchMessage(history_msgnum, 1);
 210         }
 211
 212         /* Create a new history message if necessary */
 213         if (history_msg == NULL) {
 214                 char *buf;
 215                 long len;
 216
 217                 history_msg = malloc(sizeof(struct CtdlMessage));
 218                 memset(history_msg, 0, sizeof(struct CtdlMessage));
 219                 history_msg->cm_magic = CTDLMESSAGE_MAGIC;
 220                 history_msg->cm_anon_type = MES_NORMAL;
 221                 history_msg->cm_format_type = FMT_RFC822;
 222                 CM_SetField(history_msg, eAuthor, HKEY("Citadel"));
 223                 CM_SetField(history_msg, eRecipient, CCC->room.QRname, strlen(CCC->room.QRname));
 224                 CM_SetField(history_msg, eExclusiveID, history_page, history_page_len);
 225                 CM_SetField(history_msg, eMsgSubject, history_page, history_page_len);
 226                 CM_SetField(history_msg, eSuppressIdx, HKEY("1")); /* suppress full text indexing */
 227                 snprintf(boundary, sizeof boundary, "Citadel--Multipart--%04x--%08lx", getpid(), time(NULL));
 228                 buf = (char*) malloc(1024);
 229                 len = snprintf(buf, 1024,
 230                                "Content-type: multipart/mixed; boundary=\"%s\"\n\n"
 231                                "This is a Citadel wiki history encoded as multipart MIME.\n"
 232                                "Each part is comprised of a diff script representing one change set.\n"
 233                                "\n"
 234                                "--%s--\n",
 235                                boundary, boundary
 236                 );
 237                 CM_SetAsField(history_msg, eMesageText, &buf, len);
 238         }
 239
 240         /* Update the history message (regardless of whether it's new or existing) */
 241
 242         /* Remove the Message-ID from the old version of the history message.  This will cause a brand
 243          * new one to be generated, avoiding an uninitentional hit of the loop zapper when we replicate.
 244          */
 245         CM_FlushField(history_msg, emessageId);
 246
 247         /* Figure out the boundary string.  We do this even when we generated the
 248          * boundary string in the above code, just to be safe and consistent.
 249          */
 250         *boundary = '\0';
 251
 252         ptr = history_msg->cm_fields[eMesageText];
 253         do {
 254                 ptr = memreadline(ptr, buf, sizeof buf);
 255                 if (*ptr != 0) {
 256                         striplt(buf);
 257                         if (!IsEmptyStr(buf) && (!strncasecmp(buf, "Content-type:", 13))) {
 258                                 if (
 259                                         (bmstrcasestr(buf, "multipart") != NULL)
 260                                         && (bmstrcasestr(buf, "boundary=") != NULL)
 261                                 ) {
 262                                         safestrncpy(boundary, bmstrcasestr(buf, "\""), sizeof boundary);
 263                                         char *qu;
 264                                         qu = strchr(boundary, '\"');
 265                                         if (qu) {
 266                                                 strcpy(boundary, ++qu);
 267                                         }
 268                                         qu = strchr(boundary, '\"');
 269                                         if (qu) {
 270                                                 *qu = 0;
 271                                         }
 272                                 }
 273                         }
 274                 }
 275         } while ( (IsEmptyStr(boundary)) && (*ptr != 0) );
 276
 277         /*
 278          * Now look for the first boundary.  That is where we need to insert our fun.
 279          */
 280         if (!IsEmptyStr(boundary)) {
 281                 char *MsgText;
 282                 long MsgTextLen;
 283                 time_t Now = time(NULL);
 284
 285                 snprintf(prefixed_boundary, sizeof(prefixed_boundary), "--%s", boundary);
 286
 287                 CM_GetAsField(history_msg, eMesageText, &MsgText, &MsgTextLen);
 288
 289                 ptr = bmstrcasestr(MsgText, prefixed_boundary);
 290                 if (ptr != NULL) {
 291                         StrBuf *NewMsgText;
 292                         char uuid[64];
 293                         char memo[512];
 294                         long memolen;
 295                         char encoded_memo[1024];
 296
 297                         NewMsgText = NewStrBufPlain(NULL, MsgTextLen + diffbuf_len + 1024);
 298
 299                         generate_uuid(uuid);
 300                         memolen = snprintf(memo, sizeof(memo), "%s|%ld|%s|%s",
 301                                            uuid,
 302                                            Now,
 303                                            CCC->user.fullname,
 304                                            config.c_nodename);
 305
 306                         memolen = CtdlEncodeBase64(encoded_memo, memo, memolen, 0);
 307
 308                         StrBufAppendBufPlain(NewMsgText, HKEY("--"), 0);
 309                         StrBufAppendBufPlain(NewMsgText, boundary, -1, 0);
 310                         StrBufAppendBufPlain(
 311                                 NewMsgText,
 312                                 HKEY("\n"
 313                                      "Content-type: text/plain\n"
 314                                      "Content-Disposition: inline; filename=\""), 0);
 315
 316                         StrBufAppendBufPlain(NewMsgText, encoded_memo, memolen, 0);
 317
 318                         StrBufAppendBufPlain(
 319                                 NewMsgText,
 320                                 HKEY("\"\n"
 321                                      "Content-Transfer-Encoding: 8bit\n"
 322                                      "\n"), 0);
 323
 324                         StrBufAppendBufPlain(NewMsgText, diffbuf, diffbuf_len, 0);
 325                         StrBufAppendBufPlain(NewMsgText, HKEY("\n"), 0);
 326
 327                         StrBufAppendBufPlain(NewMsgText, ptr, MsgTextLen - (ptr - MsgText), 0);
 328                         free(MsgText);
 329                         CM_SetAsFieldSB(history_msg, eMesageText, &NewMsgText);
 330                 }
 331                 else
 332                 {
 333                         CM_SetAsField(history_msg, eMesageText, &MsgText, MsgTextLen);
 334                 }
 335
 336                 CM_SetFieldLONG(history_msg, eTimestamp, Now);
 337
 338                 CtdlSubmitMsg(history_msg, NULL, "", 0);
 339         }
 340         else {
 341                 syslog(LOG_ALERT, "Empty boundary string in history message.  No history!\n");
 342         }
 343
 344         free(diffbuf);
 345         CtdlFreeMessage(history_msg);
 346         return(0);
 347 }
 348
 349
 350 /*
 351  * MIME Parser callback for wiki_history()
 352  *
 353  * The "filename" field will contain a memo field.  All we have to do is decode
 354  * the base64 and output it.  The data is already in a delimited format suitable
 355  * for our client protocol.
 356  */
 357 void wiki_history_callback(char *name, char *filename, char *partnum, char *disp,
 358                    void *content, char *cbtype, char *cbcharset, size_t length,
 359                    char *encoding, char *cbid, void *cbuserdata)
 360 {
 361         char memo[1024];
 362
 363         CtdlDecodeBase64(memo, filename, strlen(filename));
 364         cprintf("%s\n", memo);
 365 }
 366
 367
 368 /*
 369  * Fetch a list of revisions for a particular wiki page
 370  */
 371 void wiki_history(char *pagename) {
 372         int r;
 373         char history_page_name[270];
 374         long msgnum;
 375         struct CtdlMessage *msg;
 376
 377         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 378         if (r != om_ok) {
 379                 if (r == om_not_logged_in) {
 380                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 381                 }
 382                 else {
 383                         cprintf("%d An unknown error has occurred.\n", ERROR);
 384                 }
 385                 return;
 386         }
 387
 388         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 389         msgnum = CtdlLocateMessageByEuid(history_page_name, &CC->room);
 390         if (msgnum > 0L) {
 391                 msg = CtdlFetchMessage(msgnum, 1);
 392         }
 393         else {
 394                 msg = NULL;
 395         }
 396
 397         if ((msg != NULL) && (msg->cm_fields[eMesageText] == NULL)) {
 398                 CtdlFreeMessage(msg);
 399                 msg = NULL;
 400         }
 401
 402         if (msg == NULL) {
 403                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 404                 return;
 405         }
 406
 407
 408         cprintf("%d Revision history for '%s'\n", LISTING_FOLLOWS, pagename);
 409         mime_parser(msg->cm_fields[eMesageText], NULL, *wiki_history_callback, NULL, NULL, NULL, 0);
 410         cprintf("000\n");
 411
 412         CtdlFreeMessage(msg);
 413         return;
 414 }
 415
 416 /*
 417  * MIME Parser callback for wiki_rev()
 418  *
 419  * The "filename" field will contain a memo field, which includes (among other things)
 420  * the uuid of this revision.  After we hit the desired revision, we stop processing.
 421  *
 422  * The "content" filed will contain "diff" output suitable for applying via "patch"
 423  * to our temporary file.
 424  */
 425 void wiki_rev_callback(char *name, char *filename, char *partnum, char *disp,
 426                    void *content, char *cbtype, char *cbcharset, size_t length,
 427                    char *encoding, char *cbid, void *cbuserdata)
 428 {
 429         struct HistoryEraserCallBackData *hecbd = (struct HistoryEraserCallBackData *)cbuserdata;
 430         char memo[1024];
 431         char this_rev[256];
 432         FILE *fp;
 433         char *ptr = NULL;
 434         char buf[1024];
 435
 436         /* Did a previous callback already indicate that we've reached our target uuid?
 437          * If so, don't process anything else.
 438          */
 439         if (hecbd->done) {
 440                 return;
 441         }
 442
 443         CtdlDecodeBase64(memo, filename, strlen(filename));
 444         extract_token(this_rev, memo, 0, '|', sizeof this_rev);
 445         striplt(this_rev);
 446
 447         /* Perform the patch */
 448         fp = popen(PATCH " -f -s -p0 -r /dev/null >/dev/null 2>/dev/null", "w");
 449         if (fp) {
 450                 /* Replace the filenames in the patch with the tempfilename we're actually tweaking */
 451                 fprintf(fp, "--- %s\n", hecbd->tempfilename);
 452                 fprintf(fp, "+++ %s\n", hecbd->tempfilename);
 453
 454                 ptr = (char *)content;
 455                 int linenum = 0;
 456                 do {
 457                         ++linenum;
 458                         ptr = memreadline(ptr, buf, sizeof buf);
 459                         if (*ptr != 0) {
 460                                 if (linenum <= 2) {
 461                                         /* skip the first two lines; they contain bogus filenames */
 462                                 }
 463                                 else {
 464                                         fprintf(fp, "%s\n", buf);
 465                                 }
 466                         }
 467                 } while ((*ptr != 0) && (ptr < ((char*)content + length)));
 468                 if (pclose(fp) != 0) {
 469                         syslog(LOG_ERR, "pclose() returned an error - patch failed\n");
 470                 }
 471         }
 472
 473         if (!strcasecmp(this_rev, hecbd->stop_when)) {
 474                 /* Found our target rev.  Tell any subsequent callbacks to suppress processing. */
 475                 syslog(LOG_DEBUG, "Target revision has been reached -- stop patching.\n");
 476                 hecbd->done = 1;
 477         }
 478 }
 479
 480
 481 /*
 482  * Fetch a specific revision of a wiki page.  The "operation" string may be set to "fetch" in order
 483  * to simply fetch the desired revision and store it in a temporary location for viewing, or "revert"
 484  * to revert the currently active page to that revision.
 485  */
 486 void wiki_rev(char *pagename, char *rev, char *operation)
 487 {
 488         struct CitContext *CCC = CC;
 489         int r;
 490         char history_page_name[270];
 491         long msgnum;
 492         char temp[PATH_MAX];
 493         struct CtdlMessage *msg;
 494         FILE *fp;
 495         struct HistoryEraserCallBackData hecbd;
 496         long len = 0L;
 497         int rv;
 498
 499         r = CtdlDoIHavePermissionToReadMessagesInThisRoom();
 500         if (r != om_ok) {
 501                 if (r == om_not_logged_in) {
 502                         cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 503                 }
 504                 else {
 505                         cprintf("%d An unknown error has occurred.\n", ERROR);
 506                 }
 507                 return;
 508         }
 509
 510         if (!strcasecmp(operation, "revert")) {
 511                 r = CtdlDoIHavePermissionToPostInThisRoom(temp, sizeof temp, NULL, POST_LOGGED_IN, 0);
 512                 if (r != 0) {
 513                         cprintf("%d %s\n", r, temp);
 514                         return;
 515                 }
 516         }
 517
 518         /* Begin by fetching the current version of the page.  We're going to patch
 519          * backwards through the diffs until we get the one we want.
 520          */
 521         msgnum = CtdlLocateMessageByEuid(pagename, &CCC->room);
 522         if (msgnum > 0L) {
 523                 msg = CtdlFetchMessage(msgnum, 1);
 524         }
 525         else {
 526                 msg = NULL;
 527         }
 528
 529         if ((msg != NULL) && (msg->cm_fields[eMesageText] == NULL)) {
 530                 CtdlFreeMessage(msg);
 531                 msg = NULL;
 532         }
 533
 534         if (msg == NULL) {
 535                 cprintf("%d Page '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 536                 return;
 537         }
 538
 539         /* Output it to a temporary file */
 540
 541         CtdlMakeTempFileName(temp, sizeof temp);
 542         fp = fopen(temp, "w");
 543         if (fp != NULL) {
 544                 r = fwrite(msg->cm_fields[eMesageText], strlen(msg->cm_fields[eMesageText]), 1, fp);
 545                 fclose(fp);
 546         }
 547         else {
 548                 syslog(LOG_ALERT, "Cannot open %s: %s\n", temp, strerror(errno));
 549         }
 550         CtdlFreeMessage(msg);
 551
 552         /* Get the revision history */
 553
 554         snprintf(history_page_name, sizeof history_page_name, "%s_HISTORY_", pagename);
 555         msgnum = CtdlLocateMessageByEuid(history_page_name, &CCC->room);
 556         if (msgnum > 0L) {
 557                 msg = CtdlFetchMessage(msgnum, 1);
 558         }
 559         else {
 560                 msg = NULL;
 561         }
 562
 563         if ((msg != NULL) && (msg->cm_fields[eMesageText] == NULL)) {
 564                 CtdlFreeMessage(msg);
 565                 msg = NULL;
 566         }
 567
 568         if (msg == NULL) {
 569                 cprintf("%d Revision history for '%s' was not found.\n", ERROR+MESSAGE_NOT_FOUND, pagename);
 570                 return;
 571         }
 572
 573         /* Start patching backwards (newest to oldest) through the revision history until we
 574          * hit the revision uuid requested by the user.  (The callback will perform each one.)
 575          */
 576
 577         memset(&hecbd, 0, sizeof(struct HistoryEraserCallBackData));
 578         hecbd.tempfilename = temp;
 579         hecbd.stop_when = rev;
 580         striplt(hecbd.stop_when);
 581
 582         mime_parser(msg->cm_fields[eMesageText], NULL, *wiki_rev_callback, NULL, NULL, (void *)&hecbd, 0);
 583         CtdlFreeMessage(msg);
 584
 585         /* Were we successful? */
 586         if (hecbd.done == 0) {
 587                 cprintf("%d Revision '%s' of page '%s' was not found.\n",
 588                         ERROR + MESSAGE_NOT_FOUND, rev, pagename
 589                 );
 590         }
 591
 592         /* We have the desired revision on disk.  Now do something with it. */
 593
 594         else if ( (!strcasecmp(operation, "fetch")) || (!strcasecmp(operation, "revert")) ) {
 595                 msg = malloc(sizeof(struct CtdlMessage));
 596                 memset(msg, 0, sizeof(struct CtdlMessage));
 597                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 598                 msg->cm_anon_type = MES_NORMAL;
 599                 msg->cm_format_type = FMT_RFC822;
 600                 fp = fopen(temp, "r");
 601                 if (fp) {
 602                         char *msgbuf;
 603                         fseek(fp, 0L, SEEK_END);
 604                         len = ftell(fp);
 605                         fseek(fp, 0L, SEEK_SET);
 606                         msgbuf = malloc(len + 1);
 607                         rv = fread(msgbuf, len, 1, fp);
 608                         syslog(LOG_DEBUG, "did %d blocks of %ld bytes\n", rv, len);
 609                         msgbuf[len] = '\0';
 610                         CM_SetAsField(msg, eMesageText, &msgbuf, len);
 611                         fclose(fp);
 612                 }
 613                 if (len <= 0) {
 614                         msgnum = (-1L);
 615                 }
 616                 else if (!strcasecmp(operation, "fetch")) {
 617                         CM_SetField(msg, eAuthor, HKEY("Citadel"));
 618                         CtdlCreateRoom(wwm, 5, "", 0, 1, 1, VIEW_BBS);  /* Not an error if already exists */
 619                         msgnum = CtdlSubmitMsg(msg, NULL, wwm, 0);      /* Store the revision here */
 620
 621                         /*
 622                          * WARNING: VILE SLEAZY HACK
 623                          * This will avoid the 'message xxx is not in this room' security error,
 624                          * but only if the client fetches the message we just generated immediately
 625                          * without first trying to perform other fetch operations.
 626                          */
 627                         if (CCC->cached_msglist != NULL) {
 628                                 free(CCC->cached_msglist);
 629                                 CCC->cached_msglist = NULL;
 630                                 CCC->cached_num_msgs = 0;
 631                         }
 632                         CCC->cached_msglist = malloc(sizeof(long));
 633                         if (CCC->cached_msglist != NULL) {
 634                                 CCC->cached_num_msgs = 1;
 635                                 CCC->cached_msglist[0] = msgnum;
 636                         }
 637
 638                 }
 639                 else if (!strcasecmp(operation, "revert")) {
 640                         CM_SetFieldLONG(msg, eTimestamp, time(NULL));
 641                         CM_SetField(msg, eAuthor, CCC->user.fullname, strlen(CCC->user.fullname));
 642                         CM_SetField(msg, erFc822Addr, CCC->cs_inet_email, strlen(CCC->cs_inet_email));
 643                         CM_SetField(msg, eOriginalRoom, CCC->room.QRname, strlen(CCC->room.QRname));
 644                         CM_SetField(msg, eNodeName, NODENAME, strlen(NODENAME));
 645                         CM_SetField(msg, eExclusiveID, pagename, strlen(pagename));
 646                         msgnum = CtdlSubmitMsg(msg, NULL, "", 0);       /* Replace the current revision */
 647                 }
 648                 else {
 649                         /* Theoretically it is impossible to get here, but throw an error anyway */
 650                         msgnum = (-1L);
 651                 }
 652                 CtdlFreeMessage(msg);
 653                 if (msgnum >= 0L) {
 654                         cprintf("%d %ld\n", CIT_OK, msgnum);            /* Give the client a msgnum */
 655                 }
 656                 else {
 657                         cprintf("%d Error %ld has occurred.\n", ERROR+INTERNAL_ERROR, msgnum);
 658                 }
 659         }
 660
 661         /* We did all this work for nothing.  Express anguish to the caller. */
 662         else {
 663                 cprintf("%d An unknown operation was requested.\n", ERROR+CMD_NOT_SUPPORTED);
 664         }
 665
 666         unlink(temp);
 667         return;
 668 }
 669
 670
 671
 672 /*
 673  * commands related to wiki management
 674  */
 675 void cmd_wiki(char *argbuf) {
 676         char subcmd[32];
 677         char pagename[256];
 678         char rev[128];
 679         char operation[16];
 680
 681         extract_token(subcmd, argbuf, 0, '|', sizeof subcmd);
 682
 683         if (!strcasecmp(subcmd, "history")) {
 684                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 685                 wiki_history(pagename);
 686                 return;
 687         }
 688
 689         if (!strcasecmp(subcmd, "rev")) {
 690                 extract_token(pagename, argbuf, 1, '|', sizeof pagename);
 691                 extract_token(rev, argbuf, 2, '|', sizeof rev);
 692                 extract_token(operation, argbuf, 3, '|', sizeof operation);
 693                 wiki_rev(pagename, rev, operation);
 694                 return;
 695         }
 696
 697         cprintf("%d Invalid subcommand\n", ERROR + CMD_NOT_SUPPORTED);
 698 }
 699
 700
 701
 702 /*
 703  * Module initialization
 704  */
 705 CTDL_MODULE_INIT(wiki)
 706 {
 707         if (!threading)
 708         {
 709                 CtdlRegisterMessageHook(wiki_upload_beforesave, EVT_BEFORESAVE);
 710                 CtdlRegisterProtoHook(cmd_wiki, "WIKI", "Commands related to Wiki management");
 711         }
 712
 713         /* return our module name for the log */
 714         return "wiki";
 715 }