webcit-ng/room_functions.c

   1 //
   2 // Room functions
   3 //
   4 // Copyright (c) 1996-2022 by the citadel.org team
   5 //
   6 // This program is open source software.  It runs great on the
   7 // Linux operating system (and probably elsewhere).  You can use,
   8 // copy, and run it under the terms of the GNU General Public
   9 // License version 3.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 #include "webcit.h"
  17
  18
  19 // Return a "zero-terminated" array of message numbers in the current room.
  20 // Caller owns the memory and must free it.  Returns NULL if any problems.
  21 long *get_msglist(struct ctdlsession *c, char *which_msgs) {
  22         char buf[1024];
  23         long *msglist = NULL;
  24         int num_msgs = 0;
  25         int num_alloc = 0;
  26
  27         ctdl_printf(c, "MSGS %s", which_msgs);
  28         ctdl_readline(c, buf, sizeof(buf));
  29         if (buf[0] == '1') {
  30                 do {
  31                         if (num_msgs >= num_alloc) {
  32                                 if (num_alloc == 0) {
  33                                         num_alloc = 1024;
  34                                         msglist = malloc(num_alloc * sizeof(long));
  35                                 }
  36                                 else {
  37                                         num_alloc *= 2;
  38                                         msglist = realloc(msglist, num_alloc * sizeof(long));
  39                                 }
  40                         }
  41                         ctdl_readline(c, buf, sizeof(buf));
  42                         msglist[num_msgs++] = atol(buf);
  43                 } while (strcmp(buf, "000"));   // this makes the last element a "0" terminator
  44         }
  45         return msglist;
  46 }
  47
  48
  49 // Supplied with a list of potential matches from an If-Match: or If-None-Match: header, and
  50 // a message number (which we always use as the entity tag in Citadel), return nonzero if the
  51 // message number matches any of the supplied tags in the string.
  52 int match_etags(char *taglist, long msgnum) {
  53         int num_tags = num_tokens(taglist, ',');
  54         int i = 0;
  55         char tag[1024];
  56
  57         if (msgnum <= 0) {                                      // no msgnum?  no match.
  58                 return (0);
  59         }
  60
  61         for (i = 0; i < num_tags; ++i) {
  62                 extract_token(tag, taglist, i, ',', sizeof tag);
  63                 striplt(tag);
  64                 char *lq = (strchr(tag, '"'));
  65                 char *rq = (strrchr(tag, '"'));
  66                 if (lq < rq) {                                  // has two double quotes
  67                         strcpy(rq, "");
  68                         strcpy(tag, ++lq);
  69                 }
  70                 striplt(tag);
  71                 if (!strcmp(tag, "*")) {                        // wildcard match
  72                         return (1);
  73                 }
  74                 long tagmsgnum = atol(tag);
  75                 if ((tagmsgnum > 0) && (tagmsgnum == msgnum)) { // match
  76                         return (1);
  77                 }
  78         }
  79
  80         return (0);                                             // no match
  81 }
  82
  83
  84 // Client is requesting a message list
  85 void json_msglist(struct http_transaction *h, struct ctdlsession *c, char *which) {
  86         int i = 0;
  87         long *msglist = get_msglist(c, which);
  88         JsonValue *j = NewJsonArray(HKEY("msgs"));
  89
  90         if (msglist != NULL) {
  91                 for (i = 0; msglist[i] > 0; ++i) {
  92                         JsonArrayAppend(j, NewJsonNumber(HKEY("m"), msglist[i]));
  93                 }
  94                 free(msglist);
  95         }
  96
  97         StrBuf *sj = NewStrBuf();
  98         SerializeJson(sj, j, 1);        // '1' == free the source array
  99
 100         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 101         h->response_code = 200;
 102         h->response_string = strdup("OK");
 103         h->response_body_length = StrLength(sj);
 104         h->response_body = SmashStrBuf(&sj);
 105         return;
 106 }
 107
 108
 109 // Client is requesting the room info banner
 110 void read_room_info_banner(struct http_transaction *h, struct ctdlsession *c) {
 111         char buf[1024];
 112
 113         ctdl_printf(c, "RINF");
 114         ctdl_readline(c, buf, sizeof(buf));
 115         if (buf[0] == '1') {
 116                 StrBuf *info = NewStrBuf();
 117                 while (ctdl_readline(c, buf, sizeof(buf)), (strcmp(buf, "000"))){
 118                         StrBufAppendPrintf(info, "%s\n", buf);
 119                 }
 120                 add_response_header(h, strdup("Content-type"), strdup("text/plain"));
 121                 h->response_code = 200;
 122                 h->response_string = strdup("OK");
 123                 h->response_body_length = StrLength(info);
 124                 h->response_body = SmashStrBuf(&info);
 125                 return;
 126         }
 127         else {
 128                 do_404(h);
 129         }
 130 }
 131
 132
 133 // Client requested an object in a room.
 134 void object_in_room(struct http_transaction *h, struct ctdlsession *c) {
 135         char buf[1024];
 136         long msgnum = (-1);
 137         char unescaped_euid[1024];
 138
 139         extract_token(buf, h->url, 4, '/', sizeof buf);
 140
 141         if (!strncasecmp(buf, "msgs.", 5)) {            // Client is requesting a list of message numbers
 142                 unescape_input(&buf[5]);
 143                 json_msglist(h, c, &buf[5]);
 144                 return;
 145         }
 146
 147         if (!strcasecmp(buf, "info.txt")) {             // Client is requesting the room info banner
 148                 read_room_info_banner(h, c);
 149                 return;
 150         }
 151
 152         // If we get to this point, the client is requesting a specific object *in* the room.
 153
 154         if ((c->room_default_view == VIEW_CALENDAR)     // room types where objects are referenced by EUID
 155            || (c->room_default_view == VIEW_TASKS)
 156            || (c->room_default_view == VIEW_ADDRESSBOOK)
 157            ) {
 158                 safestrncpy(unescaped_euid, buf, sizeof unescaped_euid);
 159                 unescape_input(unescaped_euid);
 160                 msgnum = locate_message_by_uid(c, unescaped_euid);
 161         }
 162         else {                                          // otherwise the object is being referenced by message number
 163                 msgnum = atol(buf);
 164         }
 165
 166         // All methods except PUT require the message to already exist
 167         if ((msgnum <= 0) && (strcasecmp(h->method, "PUT"))) {
 168                 do_404(h);
 169         }
 170
 171         // If we get to this point we have a valid message number in an accessible room.
 172         syslog(LOG_DEBUG, "msgnum is %ld, method is %s", msgnum, h->method);
 173
 174         // A sixth component in the URL can be one of two things:
 175         // (1) a MIME part specifier, in which case the client wants to download that component within the message
 176         // (2) a content-type, in which ase the client wants us to try to render it a certain way
 177         if (num_tokens(h->url, '/') == 6) {
 178                 extract_token(buf, h->url, 5, '/', sizeof buf);
 179                 if (!IsEmptyStr(buf)) {
 180                         if (!strcasecmp(buf, "json")) {
 181                                 json_render_one_message(h, c, msgnum);
 182                         }
 183                         else {
 184                                 download_mime_component(h, c, msgnum, buf);
 185                         }
 186                         return;
 187                 }
 188         }
 189
 190         // Ok, we want a full message, but first let's check for the if[-none]-match headers.
 191         char *if_match = header_val(h, "If-Match");
 192         if ((if_match != NULL) && (!match_etags(if_match, msgnum))) {
 193                 do_412(h);
 194                 return;
 195         }
 196
 197         char *if_none_match = header_val(h, "If-None-Match");
 198         if ((if_none_match != NULL) && (match_etags(if_none_match, msgnum))) {
 199                 do_412(h);
 200                 return;
 201         }
 202
 203         // DOOOOOO ITTTTT!!!
 204
 205         if (!strcasecmp(h->method, "DELETE")) {
 206                 dav_delete_message(h, c, msgnum);
 207         }
 208         else if (!strcasecmp(h->method, "GET")) {
 209                 dav_get_message(h, c, msgnum);
 210         }
 211         else if (!strcasecmp(h->method, "PUT")) {
 212                 dav_put_message(h, c, unescaped_euid, msgnum);
 213         }
 214         else {
 215                 do_404(h);      // Got this far but the method made no sense?  Bummer.
 216         }
 217
 218 }
 219
 220
 221 // Called by the_room_itself() when the HTTP method is REPORT
 222 void report_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 223         if (c->room_default_view == VIEW_CALENDAR) {
 224                 caldav_report(h, c);    // CalDAV REPORTs ... fmgwac
 225                 return;
 226         }
 227
 228         do_404(h);              // future implementations like CardDAV will require code paths here
 229 }
 230
 231
 232 // Called by the_room_itself() when the HTTP method is OPTIONS
 233 void options_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 234         h->response_code = 200;
 235         h->response_string = strdup("OK");
 236         if (c->room_default_view == VIEW_CALENDAR) {
 237                 add_response_header(h, strdup("DAV"), strdup("1, calendar-access"));    // offer CalDAV
 238         }
 239         else if (c->room_default_view == VIEW_ADDRESSBOOK) {
 240                 add_response_header(h, strdup("DAV"), strdup("1, addressbook"));        // offer CardDAV
 241         }
 242         else {
 243                 add_response_header(h, strdup("DAV"), strdup("1"));     // ordinary WebDAV for all other room types
 244         }
 245         add_response_header(h, strdup("Allow"), strdup("OPTIONS, PROPFIND, GET, PUT, REPORT, DELETE"));
 246 }
 247
 248
 249 // Called by the_room_itself() when the HTTP method is PROPFIND
 250 void propfind_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 251         char *e;
 252         long timestamp;
 253         int dav_depth = (header_val(h, "Depth") ? atoi(header_val(h, "Depth")) : INT_MAX);
 254         syslog(LOG_DEBUG, "Client PROPFIND requested depth: %d", dav_depth);
 255         StrBuf *Buf = NewStrBuf();
 256
 257         StrBufAppendPrintf(Buf, "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 258                            "<D:multistatus " "xmlns:D=\"DAV:\" " "xmlns:C=\"urn:ietf:params:xml:ns:caldav\"" ">");
 259
 260         // Transmit the collection resource
 261         StrBufAppendPrintf(Buf, "<D:response>");
 262         StrBufAppendPrintf(Buf, "<D:href>");
 263         StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 264         StrBufAppendPrintf(Buf, "/ctdl/r/");
 265         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 266         StrBufAppendPrintf(Buf, "</D:href>");
 267
 268         StrBufAppendPrintf(Buf, "<D:propstat>");
 269         StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 270         StrBufAppendPrintf(Buf, "<D:prop>");
 271         StrBufAppendPrintf(Buf, "<D:displayname>");
 272         StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 273         StrBufAppendPrintf(Buf, "</D:displayname>");
 274
 275         StrBufAppendPrintf(Buf, "<D:owner />"); // empty owner ought to be legal; see rfc3744 section 5.1
 276
 277         StrBufAppendPrintf(Buf, "<D:resourcetype><D:collection />");
 278         switch (c->room_default_view) {
 279         case VIEW_CALENDAR:
 280                 StrBufAppendPrintf(Buf, "<C:calendar />");      // RFC4791 section 4.2
 281                 break;
 282         }
 283         StrBufAppendPrintf(Buf, "</D:resourcetype>");
 284
 285         int enumerate_by_euid = 0;      // nonzero if messages will be retrieved by euid instead of msgnum
 286         switch (c->room_default_view) {
 287         case VIEW_CALENDAR:             // RFC4791 section 5.2
 288                 StrBufAppendPrintf(Buf, "<C:supported-calendar-component-set><C:comp name=\"VEVENT\"/></C:supported-calendar-component-set>");
 289                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 290                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 291                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 292                 enumerate_by_euid = 1;
 293                 break;
 294         case VIEW_TASKS:                // RFC4791 section 5.2
 295                 StrBufAppendPrintf(Buf, "<C:supported-calendar-component-set><C:comp name=\"VTODO\"/></C:supported-calendar-component-set>");
 296                 StrBufAppendPrintf(Buf, "<C:supported-calendar-data>");
 297                 StrBufAppendPrintf(Buf, "<C:calendar-data content-type=\"text/calendar\" version=\"2.0\"/>");
 298                 StrBufAppendPrintf(Buf, "</C:supported-calendar-data>");
 299                 enumerate_by_euid = 1;
 300                 break;
 301         case VIEW_ADDRESSBOOK:          // FIXME put some sort of CardDAV crapola here when we implement it
 302                 enumerate_by_euid = 1;
 303                 break;
 304         case VIEW_WIKI:                 // FIXME invent "WikiDAV" ?
 305                 enumerate_by_euid = 1;
 306                 break;
 307         }
 308
 309         // FIXME get the mtime
 310         // StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 311         // escputs(datestring);
 312         // StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 313
 314         StrBufAppendPrintf(Buf, "</D:prop>");
 315         StrBufAppendPrintf(Buf, "</D:propstat>");
 316         StrBufAppendPrintf(Buf, "</D:response>\n");
 317
 318         // If a depth greater than zero was specified, transmit the collection listing
 319         // BEGIN COLLECTION
 320         if (dav_depth > 0) {
 321                 long *msglist = get_msglist(c, "ALL");
 322                 if (msglist) {
 323                         int i;
 324                         for (i = 0; (msglist[i] > 0); ++i) {
 325                                 if ((i % 10) == 0)
 326                                         syslog(LOG_DEBUG, "PROPFIND enumerated %d messages", i);
 327                                 e = NULL;       // EUID gets stored here
 328                                 timestamp = 0;
 329
 330                                 char cbuf[1024];
 331                                 ctdl_printf(c, "MSG0 %ld|3", msglist[i]);
 332                                 ctdl_readline(c, cbuf, sizeof(cbuf));
 333                                 if (cbuf[0] == '1')
 334                                         while (ctdl_readline(c, cbuf, sizeof(cbuf)), strcmp(cbuf, "000")) {
 335                                                 if ((enumerate_by_euid) && (!strncasecmp(cbuf, "exti=", 5))) {
 336                                                         // e = strdup(&cbuf[5]);
 337                                                         int elen = (2 * strlen(&cbuf[5]));
 338                                                         e = malloc(elen);
 339                                                         urlesc(e, elen, &cbuf[5]);
 340                                                 }
 341                                                 if (!strncasecmp(cbuf, "time=", 5)) {
 342                                                         timestamp = atol(&cbuf[5]);
 343                                                 }
 344                                         }
 345                                 if (e == NULL) {
 346                                         e = malloc(20);
 347                                         sprintf(e, "%ld", msglist[i]);
 348                                 }
 349                                 StrBufAppendPrintf(Buf, "<D:response>");
 350
 351                                 // Generate the 'href' tag for this message
 352                                 StrBufAppendPrintf(Buf, "<D:href>");
 353                                 StrBufXMLEscAppend(Buf, NULL, h->site_prefix, strlen(h->site_prefix), 0);
 354                                 StrBufAppendPrintf(Buf, "/ctdl/r/");
 355                                 StrBufXMLEscAppend(Buf, NULL, c->room, strlen(c->room), 0);
 356                                 StrBufAppendPrintf(Buf, "/");
 357                                 StrBufXMLEscAppend(Buf, NULL, e, strlen(e), 0);
 358                                 StrBufAppendPrintf(Buf, "</D:href>");
 359                                 StrBufAppendPrintf(Buf, "<D:propstat>");
 360                                 StrBufAppendPrintf(Buf, "<D:status>HTTP/1.1 200 OK</D:status>");
 361                                 StrBufAppendPrintf(Buf, "<D:prop>");
 362
 363                                 switch (c->room_default_view) {
 364                                 case VIEW_CALENDAR:
 365                                         StrBufAppendPrintf(Buf,
 366                                                            "<D:getcontenttype>text/calendar; component=vevent</D:getcontenttype>");
 367                                         break;
 368                                 case VIEW_TASKS:
 369                                         StrBufAppendPrintf(Buf,
 370                                                            "<D:getcontenttype>text/calendar; component=vtodo</D:getcontenttype>");
 371                                         break;
 372                                 case VIEW_ADDRESSBOOK:
 373                                         StrBufAppendPrintf(Buf, "<D:getcontenttype>text/x-vcard</D:getcontenttype>");
 374                                         break;
 375                                 }
 376
 377                                 if (timestamp > 0) {
 378                                         char *datestring = http_datestring(timestamp);
 379                                         if (datestring) {
 380                                                 StrBufAppendPrintf(Buf, "<D:getlastmodified>");
 381                                                 StrBufXMLEscAppend(Buf, NULL, datestring, strlen(datestring), 0);
 382                                                 StrBufAppendPrintf(Buf, "</D:getlastmodified>");
 383                                                 free(datestring);
 384                                         }
 385                                         if (enumerate_by_euid) {        // FIXME ajc 2017oct30 should this be inside the timestamp conditional?
 386                                                 StrBufAppendPrintf(Buf, "<D:getetag>\"%ld\"</D:getetag>", msglist[i]);
 387                                         }
 388                                 }
 389                                 StrBufAppendPrintf(Buf, "</D:prop></D:propstat></D:response>\n");
 390                                 free(e);
 391                         }
 392                         free(msglist);
 393                 };
 394         }
 395         // END COLLECTION
 396
 397         StrBufAppendPrintf(Buf, "</D:multistatus>\n");
 398
 399         add_response_header(h, strdup("Content-type"), strdup("text/xml"));
 400         h->response_code = 207;
 401         h->response_string = strdup("Multi-Status");
 402         h->response_body_length = StrLength(Buf);
 403         h->response_body = SmashStrBuf(&Buf);
 404 }
 405
 406 // some good examples here
 407 // http://blogs.nologin.es/rickyepoderi/index.php?/archives/14-Introducing-CalDAV-Part-I.html
 408
 409
 410 // Called by the_room_itself() when the HTTP method is PROPFIND
 411 void get_the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 412         JsonValue *j = NewJsonObject(HKEY("gotoroom"));
 413
 414         JsonObjectAppend(j, NewJsonPlainString(HKEY("name"), c->room, -1));
 415         JsonObjectAppend(j, NewJsonNumber(HKEY("current_view"), c->room_current_view));
 416         JsonObjectAppend(j, NewJsonNumber(HKEY("default_view"), c->room_default_view));
 417         JsonObjectAppend(j, NewJsonNumber(HKEY("new_messages"), c->new_messages));
 418         JsonObjectAppend(j, NewJsonNumber(HKEY("total_messages"), c->total_messages));
 419         JsonObjectAppend(j, NewJsonNumber(HKEY("last_seen"), c->last_seen));
 420
 421         StrBuf *sj = NewStrBuf();
 422         SerializeJson(sj, j, 1);        // '1' == free the source array
 423
 424         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 425         h->response_code = 200;
 426         h->response_string = strdup("OK");
 427         h->response_body_length = StrLength(sj);
 428         h->response_body = SmashStrBuf(&sj);
 429         return;
 430 }
 431
 432
 433 // Handle REST/DAV requests for the room itself (such as /ctdl/r/roomname
 434 // or /ctdl/r/roomname/ but *not* specific objects within the room)
 435 void the_room_itself(struct http_transaction *h, struct ctdlsession *c) {
 436
 437         // OPTIONS method on the room itself usually is a DAV client assessing what's here.
 438         if (!strcasecmp(h->method, "OPTIONS")) {
 439                 options_the_room_itself(h, c);
 440                 return;
 441         }
 442
 443         // PROPFIND method on the room itself could be looking for a directory
 444         if (!strcasecmp(h->method, "PROPFIND")) {
 445                 propfind_the_room_itself(h, c);
 446                 return;
 447         }
 448
 449         // REPORT method on the room itself is probably the dreaded CalDAV tower-of-crapola
 450         if (!strcasecmp(h->method, "REPORT")) {
 451                 report_the_room_itself(h, c);
 452                 return;
 453         }
 454
 455         // GET method on the room itself is an API call, possibly from our JavaScript front end
 456         if (!strcasecmp(h->method, "get")) {
 457                 get_the_room_itself(h, c);
 458                 return;
 459         }
 460
 461         // we probably want a "go to this room" for interactive access
 462         do_404(h);
 463 }
 464
 465
 466 // Dispatcher for "/ctdl/r" and "/ctdl/r/" for the room list
 467 void room_list(struct http_transaction *h, struct ctdlsession *c) {
 468         char buf[1024];
 469         char roomname[1024];
 470
 471         ctdl_printf(c, "LKRA");
 472         ctdl_readline(c, buf, sizeof(buf));
 473         if (buf[0] != '1') {
 474                 do_502(h);
 475                 return;
 476         }
 477
 478         JsonValue *j = NewJsonArray(HKEY("lkra"));
 479         while (ctdl_readline(c, buf, sizeof(buf)), strcmp(buf, "000")) {
 480
 481                 // 0   |1      |2      |3      |4       |5 |6           |7           |8
 482                 // name|QRflags|QRfloor|QRorder|QRflags2|ra|current_view|default_view|mtime
 483                 JsonValue *jr = NewJsonObject(HKEY("room"));
 484
 485                 extract_token(roomname, buf, 0, '|', sizeof roomname);
 486                 JsonObjectAppend(jr, NewJsonPlainString(HKEY("name"), roomname, -1));
 487
 488                 JsonObjectAppend(jr, NewJsonNumber(HKEY("floor"), extract_int(buf, 2)));
 489                 JsonObjectAppend(jr, NewJsonNumber(HKEY("rorder"), extract_int(buf, 3)));
 490
 491                 int ra = extract_int(buf, 5);
 492                 JsonObjectAppend(jr, NewJsonBool(HKEY("known"), (ra & UA_KNOWN)));
 493                 JsonObjectAppend(jr, NewJsonBool(HKEY("hasnewmsgs"), (ra & UA_HASNEWMSGS)));
 494
 495                 JsonObjectAppend(jr, NewJsonNumber(HKEY("current_view"), extract_int(buf, 6)));
 496                 JsonObjectAppend(jr, NewJsonNumber(HKEY("default_view"), extract_int(buf, 7)));
 497                 JsonObjectAppend(jr, NewJsonNumber(HKEY("mtime"), extract_int(buf, 8)));
 498
 499                 JsonArrayAppend(j, jr); // add the room to the array
 500         }
 501
 502         StrBuf *sj = NewStrBuf();
 503         SerializeJson(sj, j, 1);        // '1' == free the source array
 504
 505         add_response_header(h, strdup("Content-type"), strdup("application/json"));
 506         h->response_code = 200;
 507         h->response_string = strdup("OK");
 508         h->response_body_length = StrLength(sj);
 509         h->response_body = SmashStrBuf(&sj);
 510 }
 511
 512
 513 // Dispatcher for paths starting with /ctdl/r/
 514 void ctdl_r(struct http_transaction *h, struct ctdlsession *c) {
 515         char requested_roomname[128];
 516         char buf[1024];
 517
 518         // All room-related functions require being "in" the room specified.  Are we in that room already?
 519         extract_token(requested_roomname, h->url, 3, '/', sizeof requested_roomname);
 520         unescape_input(requested_roomname);
 521
 522         if (IsEmptyStr(requested_roomname)) {   //      /ctdl/r/
 523                 room_list(h, c);
 524                 return;
 525         }
 526         // If not, try to go there.
 527         if (strcasecmp(requested_roomname, c->room)) {
 528                 ctdl_printf(c, "GOTO %s", requested_roomname);
 529                 ctdl_readline(c, buf, sizeof(buf));
 530                 if (buf[0] == '2') {
 531                         // buf[3] will indicate whether any instant messages are waiting
 532                         extract_token(c->room, &buf[4], 0, '|', sizeof c->room);
 533                         c->new_messages = extract_int(&buf[4], 1);
 534                         c->total_messages = extract_int(&buf[4], 2);
 535                         //      3       (int)info                       Info flag: set to nonzero if the user needs to read this room's info file
 536                         //      4       (int)CC->room.QRflags           Various flags associated with this room.
 537                         //      5       (long)CC->room.QRhighest        The highest message number present in this room
 538                         c->last_seen = extract_long(&buf[4], 6);        // The highest message number the user has read in this room
 539                         //      7       (int)rmailflag                  Boolean flag: 1 if this is a Mail> room, 0 otherwise.
 540                         //      8       (int)raideflag                  Nonzero if user is either Aide or a Room Aide in this room
 541                         //      9       (int)newmailcount               The number of new Mail messages the user has
 542                         //      10      (int)CC->room.QRfloor           The floor number this room resides on
 543                         c->room_current_view = extract_int(&buf[4], 11);
 544                         c->room_default_view = extract_int(&buf[4], 12);
 545                         //      13      (int)is_trash                   Boolean flag: 1 if this is the user's Trash folder, 0 otherwise.
 546                         //      14      (int)CC->room.QRflags2          More flags associated with this room
 547                         //      15      (long)CC->room.QRmtime          Timestamp of the last write activity in this room
 548                 }
 549                 else {
 550                         do_404(h);
 551                         return;
 552                 }
 553         }
 554         // At this point our Citadel client session is "in" the specified room.
 555
 556         if (num_tokens(h->url, '/') == 4) {     //      /ctdl/r/roomname
 557                 the_room_itself(h, c);
 558                 return;
 559         }
 560
 561         extract_token(buf, h->url, 4, '/', sizeof buf);
 562         if (num_tokens(h->url, '/') == 5) {
 563                 if (IsEmptyStr(buf)) {
 564                         the_room_itself(h, c);  //      /ctdl/r/roomname/       ( same as /ctdl/r/roomname )
 565                 }
 566                 else {
 567                         object_in_room(h, c);   //      /ctdl/r/roomname/object
 568                 }
 569                 return;
 570         }
 571         if (num_tokens(h->url, '/') == 6) {
 572                 object_in_room(h, c);   //      /ctdl/r/roomname/object/ or possibly /ctdl/r/roomname/object/component
 573                 return;
 574         }
 575         // If we get to this point, the client specified a valid room but requested an action we don't know how to perform.
 576         do_404(h);
 577 }