webcit/webcit.c

   1 /*
   2  * This is the main transaction loop of the web service.  It maintains a
   3  * persistent session to the Citadel server, handling HTTP WebCit requests as
   4  * they arrive and presenting a user interface.
   5  *
   6  * Copyright (c) 1996-2011 by the citadel.org team
   7  *
   8  * This program is open source software.  You can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 3 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #define SHOW_ME_VAPPEND_PRINTF
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include "webcit.h"
  27 #include "dav.h"
  28 #include "webserver.h"
  29
  30 StrBuf *csslocal = NULL;
  31 HashList *HandlerHash = NULL;
  32
  33 void stuff_to_cookie(int unset_cookie);
  34 int GetConnected(void);
  35
  36
  37 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  38 {
  39         wcsession *WCC = WC;
  40         int n;
  41
  42         n = GetCount(WCC->Hdr->HTTPHeaders);
  43         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  44 }
  45
  46 void DeleteWebcitHandler(void *vHandler)
  47 {
  48         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  49         FreeStrBuf(&Handler->Name);
  50         FreeStrBuf(&Handler->DisplayName);
  51         free (Handler);
  52 }
  53
  54 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  55                          const char *DisplayName, long dslen,
  56                          WebcitHandlerFunc F,
  57                          long Flags)
  58 {
  59         WebcitHandler *NewHandler;
  60         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  61         NewHandler->F = F;
  62         NewHandler->Flags = Flags;
  63         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  64         StrBufShrinkToFit(NewHandler->Name, 1);
  65         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  66         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  67         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  68 }
  69
  70 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  71 {
  72         wcsession *WCC = WC;
  73         if (WCC->Hdr->HR.Handler != NULL)
  74                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  75 }
  76
  77
  78 /*
  79  * web-printing funcion. uses our vsnprintf wrapper
  80  */
  81 #ifdef UBER_VERBOSE_DEBUGGING
  82 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  83 #else
  84 void wc_printf(const char *format,...)
  85 #endif
  86 {
  87         wcsession *WCC = WC;
  88         va_list arg_ptr;
  89
  90         if (WCC->WBuf == NULL)
  91                 WCC->WBuf = NewStrBuf();
  92 #ifdef UBER_VERBOSE_DEBUGGING
  93         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  94 #endif
  95
  96         va_start(arg_ptr, format);
  97         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  98         va_end(arg_ptr);
  99 #ifdef UBER_VERBOSE_DEBUGGING
 100         StrBufAppendPrintf(WCC->WBuf, "]\n");
 101 #endif
 102 }
 103
 104 /*
 105  * http-header-printing funcion. uses our vsnprintf wrapper
 106  */
 107 void hprintf(const char *format,...)
 108 {
 109         wcsession *WCC = WC;
 110         va_list arg_ptr;
 111
 112         va_start(arg_ptr, format);
 113         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 114         va_end(arg_ptr);
 115 }
 116
 117
 118
 119 /*
 120  * wrap up an HTTP session, closes tags, etc.
 121  *
 122  * print_standard_html_footer should be set to:
 123  * 0            - to transmit only,
 124  * nonzero      - to append the closing tags
 125  */
 126 void wDumpContent(int print_standard_html_footer)
 127 {
 128         if (print_standard_html_footer) {
 129                 wc_printf("</div> <!-- end of 'content' div -->\n");
 130                 do_template("trailing");
 131         }
 132
 133         /* If we've been saving it all up for one big output burst,
 134          * go ahead and do that now.
 135          */
 136         end_burst();
 137 }
 138
 139
 140
 141
 142 /*
 143  * Output HTTP headers and leading HTML for a page
 144  */
 145 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 146                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 147
 148                         int do_room_banner,     /* 0=no, 1=yes,
 149                                                  * 2 = I'm going to embed my own, so don't open the
 150                                                  *     <div id="content"> either.
 151                                                  */
 152
 153                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 154                         int suppress_check,     /* 1 = suppress check for instant messages        */
 155                         int cache               /* 1 = allow browser to cache this page      */
 156 ) {
 157         wcsession *WCC = WC;
 158         char httpnow[128];
 159
 160         hprintf("HTTP/1.1 200 OK\n");
 161         http_datestring(httpnow, sizeof httpnow, time(NULL));
 162
 163         if (do_httpheaders) {
 164                 if (WCC->serv_info != NULL)
 165                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 166                                 "Server: %s / %s\n"
 167                                 "Connection: close\r\n",
 168                                 PACKAGE_STRING,
 169                                 ChrPtr(WCC->serv_info->serv_software));
 170                 else
 171                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 172                                 "Server: %s / [n/a]\n"
 173                                 "Connection: close\r\n",
 174                                 PACKAGE_STRING);
 175         }
 176
 177         if (cache > 0) {
 178                 char httpTomorow[128];
 179
 180                 http_datestring(httpTomorow, sizeof httpTomorow,
 181                                 time(NULL) + 60 * 60 * 24 * 2);
 182
 183                 hprintf("Pragma: public\r\n"
 184                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 185                         "Last-modified: %s\r\n"
 186                         "Expires: %s\r\n",
 187                         httpnow,
 188                         httpTomorow
 189                 );
 190         }
 191         else {
 192                 hprintf("Pragma: no-cache\r\n"
 193                         "Cache-Control: no-store\r\n"
 194                         "Expires: -1\r\n"
 195                 );
 196         }
 197
 198         if (cache < 2) stuff_to_cookie(unset_cookies);
 199
 200         if (do_htmlhead) {
 201                 begin_burst();
 202                 do_template("head");
 203
 204                 /* check for ImportantMessages (these display in a div overlaying the main screen) */
 205                 if (StrLength(WCC->ImportantMsg) > 0) {
 206                         wc_printf("<div id=\"important_message\">\n"
 207                                 "<span class=\"imsg\">");
 208                         StrEscAppend(WCC->WBuf, WCC->ImportantMsg, NULL, 0, 0);
 209                         wc_printf("</span><br>\n"
 210                                 "</div>\n"
 211                         );
 212                         StrBufAppendBufPlain(WCC->trailing_javascript,
 213                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 214                                              0
 215                         );
 216                         FlushStrBuf(WCC->ImportantMsg);
 217                 }
 218                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 219                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 220                 }
 221
 222                 if (do_room_banner == 1) {
 223                         tmplput_roombanner(NULL, NULL);
 224                 }
 225         }
 226
 227         if (do_room_banner == 1) {
 228                 wc_printf("<div id=\"content\">\n");
 229         }
 230 }
 231
 232 void output_custom_content_header(const char *ctype) {
 233   hprintf("HTTP/1.1 200 OK\r\n");
 234   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 235   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 236   hprintf("Connection: close\r\n");
 237 }
 238
 239
 240 /*
 241  * Generic function to do an HTTP redirect.  Easy and fun.
 242  */
 243 void http_redirect(const char *whichpage) {
 244         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 245         hprintf("Location: %s\r\n", whichpage);
 246         hprintf("URI: %s\r\n", whichpage);
 247         hprintf("Content-type: text/html; charset=utf-8\r\n");
 248         begin_burst();
 249         wc_printf("<html><body>");
 250         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 251         wc_printf("</body></html>\n");
 252         end_burst();
 253 }
 254
 255
 256
 257 /*
 258  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 259  */
 260 void http_transmit_thing(const char *content_type, int is_static)
 261 {
 262
 263         syslog(9, "http_transmit_thing(%s)%s\n", content_type, ((is_static > 0) ? " (static)" : ""));
 264         output_headers(0, 0, 0, 0, 0, is_static);
 265
 266         hprintf("Content-type: %s\r\n"
 267                 "Server: %s\r\n"
 268                 "Connection: close\r\n",
 269                 content_type,
 270                 PACKAGE_STRING);
 271
 272         end_burst();
 273 }
 274
 275
 276 /*
 277  * Convenience functions to display a page containing only a string
 278  *
 279  * titlebarcolor        color of the titlebar of the frame
 280  * titlebarmsg          text to display in the title bar
 281  * messagetext          body of the box
 282  */
 283 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 284 {
 285         hprintf("HTTP/1.1 200 OK\n");
 286         output_headers(1, 1, 2, 0, 0, 0);
 287         wc_printf("<div id=\"banner\">\n");
 288         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 289         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 290         wc_printf("</td></tr></table>\n");
 291         wc_printf("</div>\n<div id=\"content\">\n");
 292         escputs(messagetext);
 293
 294         wc_printf("<hr />\n");
 295         wDumpContent(1);
 296 }
 297
 298
 299 /*
 300  * Display a blank page.
 301  */
 302 void blank_page(void) {
 303         output_headers(1, 1, 0, 0, 0, 0);
 304         wDumpContent(2);
 305 }
 306
 307
 308 /*
 309  * A template has been requested
 310  */
 311 void url_do_template(void) {
 312         const StrBuf *MimeType;
 313         const StrBuf *Tmpl = sbstr("template");
 314         begin_burst();
 315         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 316         http_transmit_thing(ChrPtr(MimeType), 0);
 317 }
 318
 319
 320
 321 /*
 322  * convenience function to indicate success
 323  */
 324 void display_success(const char *successmessage)
 325 {
 326         convenience_page("007700", "OK", successmessage);
 327 }
 328
 329
 330 /*
 331  * Authorization required page (sends a 401, causing the browser to request login credentials)
 332  */
 333 void authorization_required(void)
 334 {
 335         wcsession *WCC = WC;
 336         const char *message = "";
 337
 338         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 339         hprintf(
 340                 "Server: %s / %s\r\n"
 341                 "Connection: close\r\n",
 342                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 343         );
 344         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 345         hprintf("Content-Type: text/html\r\n");
 346         begin_burst();
 347         wc_printf("<h1>");
 348         wc_printf(_("Authorization Required"));
 349         wc_printf("</h1>\r\n");
 350
 351
 352         if (WCC->ImportantMsg != NULL)
 353                 message = ChrPtr(WCC->ImportantMsg);
 354
 355         wc_printf(_("The resource you requested requires a valid username and password. "
 356                 "You could not be logged in: %s\n"), message);
 357         wDumpContent(0);
 358         end_webcit_session();
 359 }
 360
 361 /*
 362  * Convenience functions to wrap around asynchronous ajax responses
 363  */
 364 void begin_ajax_response(void) {
 365         wcsession *WCC = WC;
 366
 367         FlushStrBuf(WCC->HBuf);
 368         output_headers(0, 0, 0, 0, 0, 0);
 369
 370         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 371                 "Server: %s\r\n"
 372                 "Connection: close\r\n"
 373                 ,
 374                 PACKAGE_STRING);
 375         begin_burst();
 376 }
 377
 378 /*
 379  * print ajax response footer
 380  */
 381 void end_ajax_response(void) {
 382         wDumpContent(0);
 383 }
 384
 385
 386
 387 /*
 388  * Wraps a Citadel server command in an AJAX transaction.
 389  */
 390 void ajax_servcmd(void)
 391 {
 392         wcsession *WCC = WC;
 393         int Done = 0;
 394         StrBuf *Buf;
 395         char *junk;
 396         size_t len;
 397
 398         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"\n", bstr("g_cmd") );
 399         begin_ajax_response();
 400         Buf = NewStrBuf();
 401         serv_puts(bstr("g_cmd"));
 402         StrBuf_ServGetln(Buf);
 403         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 404         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 405
 406         switch (GetServerStatus(Buf, NULL)) {
 407         case 8:
 408                 serv_puts("\n\n000");
 409                 if ( (StrLength(Buf)==3) &&
 410                      !strcmp(ChrPtr(Buf), "000")) {
 411                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 412                         break;
 413                 }
 414         case 1:
 415                 while (!Done) {
 416                         if (StrBuf_ServGetln(Buf) < 0)
 417                                 break;
 418                         if ( (StrLength(Buf)==3) &&
 419                              !strcmp(ChrPtr(Buf), "000")) {
 420                                 Done = 1;
 421                         }
 422                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 423                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 424                 }
 425                 break;
 426         case 4:
 427                 text_to_server(bstr("g_input"));
 428                 serv_puts("000");
 429                 break;
 430         case 6:
 431                 len = atol(&ChrPtr(Buf)[4]);
 432                 StrBuf_ServGetBLOBBuffered(Buf, len);
 433                 break;
 434         case 7:
 435                 len = atol(&ChrPtr(Buf)[4]);
 436                 junk = malloc(len);
 437                 memset(junk, 0, len);
 438                 serv_write(junk, len);
 439                 free(junk);
 440         }
 441
 442         end_ajax_response();
 443
 444         /*
 445          * This is kind of an ugly hack, but this is the only place it can go.
 446          * If the command was GEXP, then the instant messenger window must be
 447          * running, so reset the "last_pager_check" watchdog timer so
 448          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 449          */
 450         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 451                 WCC->last_pager_check = time(NULL);
 452         }
 453         FreeStrBuf(&Buf);
 454 }
 455
 456
 457 /*
 458  * Helper function for the asynchronous check to see if we need
 459  * to open the instant messenger window.
 460  */
 461 void seconds_since_last_gexp(void)
 462 {
 463         char buf[256];
 464
 465         if ( (time(NULL) - WC->last_pager_check) < 30) {
 466                 wc_printf("NO\n");
 467         }
 468         else {
 469                 memset(buf, 0, 5);
 470                 serv_puts("NOOP");
 471                 serv_getln(buf, sizeof buf);
 472                 if (buf[3] == '*') {
 473                         wc_printf("YES");
 474                 }
 475                 else {
 476                         wc_printf("NO");
 477                 }
 478         }
 479 }
 480
 481
 482 /*
 483  * Save a URL destination so we can go to it later
 484  */
 485 void push_destination(void) {
 486         wcsession *WCC = WC;
 487
 488         if (!WCC) {
 489                 wc_printf("no session");
 490                 return;
 491         }
 492
 493         FreeStrBuf(&WCC->PushedDestination);
 494         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 495         syslog(9, "Push: %s\n", ChrPtr(WCC->PushedDestination));
 496         wc_printf("OK");
 497 }
 498
 499 /*
 500  * Go to the URL saved by push_destination()
 501  */
 502 void pop_destination(void) {
 503         wcsession *WCC = WC;
 504
 505         /*
 506          * If we are in the middle of a new user signup, the server may request that
 507          * we first pass through a registration screen.
 508          */
 509         if ((WCC) && (WCC->need_regi)) {
 510                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 511                         /* Registering will take us to the My Citadel Config room, so save our place */
 512                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 513                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 514                 }
 515                 WCC->need_regi = 0;
 516                 display_reg(1);
 517                 return;
 518         }
 519
 520         /*
 521          * Do something reasonable if we somehow ended up requesting a pop without
 522          * having first done a push.
 523          */
 524         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 525                 do_welcome();
 526                 return;
 527         }
 528
 529         /*
 530          * All righty then!  We have a destination saved, so go there now.
 531          */
 532         syslog(9, "Pop: %s\n", ChrPtr(WCC->PushedDestination));
 533         http_redirect(ChrPtr(WCC->PushedDestination));
 534 }
 535
 536
 537
 538 int ReadPostData(void)
 539 {
 540         int rc;
 541         int urlencoded_post = 0;
 542         wcsession *WCC = WC;
 543         StrBuf *content = NULL;
 544
 545         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 546
 547         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 548
 549         if (!urlencoded_post)
 550         {
 551                 StrBufPrintf(content,
 552                      "Content-type: %s\n"
 553                              "Content-length: %ld\n\n",
 554                              ChrPtr(WCC->Hdr->HR.ContentType),
 555                              WCC->Hdr->HR.ContentLength);
 556         }
 557
 558         /** Read the entire input data at once. */
 559         rc = client_read_to(WCC->Hdr, content,
 560                             WCC->Hdr->HR.ContentLength,
 561                             SLEEPING);
 562         if (rc < 0)
 563                 return rc;
 564
 565
 566         if (urlencoded_post) {
 567                 ParseURLParams(content);
 568         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 569                 char *Buf;
 570                 char *BufEnd;
 571                 long len;
 572
 573                 len = StrLength(content);
 574                 Buf = SmashStrBuf(&content);
 575                 BufEnd = Buf + len;
 576                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 577                 free(Buf);
 578         } else if (WCC->Hdr->HR.ContentLength > 0) {
 579                 WCC->upload = content;
 580                 WCC->upload_length = StrLength(WCC->upload);
 581                 content = NULL;
 582         }
 583         FreeStrBuf(&content);
 584         return 1;
 585 }
 586
 587
 588 void ParseREST_URL(void)
 589 {
 590         StrBuf *Buf;
 591         StrBuf *pFloor = NULL;
 592         wcsession *WCC = WC;
 593         long i = 0;
 594         const char *pCh = NULL;
 595         HashList *Floors;
 596         void *vFloor;
 597
 598         syslog(1, "parsing rest URL: %s\n", ChrPtr(WCC->Hdr->HR.ReqLine));
 599
 600         WCC->Directory = NewHash(1, Flathash);
 601         WCC->CurrentFloor = NULL;
 602
 603         Buf = NewStrBuf();
 604         while (StrBufExtract_NextToken(Buf, WCC->Hdr->HR.ReqLine, &pCh,  '/') >= 0)
 605         {
 606                 if (StrLength(Buf) != 0) {
 607                         /* ignore empty path segments */
 608                         StrBufUnescape(Buf, 1);
 609                         Put(WCC->Directory, IKEY(i), Buf, HFreeStrBuf);
 610                         if (i==0)
 611                                 pFloor = Buf;
 612                         Buf = NewStrBuf();
 613                 }
 614                 i++;
 615         }
 616
 617         FreeStrBuf(&Buf);
 618         if (pFloor != NULL)
 619         {
 620                 Floors = GetFloorListHash(NULL, NULL);
 621
 622                 if (Floors != NULL)
 623                 {
 624                         if (GetHash(WCC->FloorsByName, SKEY(pFloor), &vFloor))
 625                                 WCC->CurrentFloor = (Floor*) vFloor;
 626                 }
 627         }
 628 }
 629
 630 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 631 {
 632         long Depth, IsDepth;
 633         long offset = 0;
 634         wcsession *WCC = WC;
 635
 636         if (WCC->Hdr->HR.Handler != NULL)
 637                 offset ++;
 638         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 639         IsDepth = GetCount(WCC->Directory) + offset;
 640
 641 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 642         if (Depth < 0) {
 643                 Depth = -Depth;
 644                 return IsDepth > Depth;
 645         }
 646         else
 647                 return Depth == IsDepth;
 648 }
 649
 650
 651
 652 /*
 653  * Entry point for WebCit transaction
 654  */
 655 void session_loop(void)
 656 {
 657         int xhttp;
 658         StrBuf *Buf;
 659
 660         /*
 661          * We stuff these with the values coming from the client cookies,
 662          * so we can use them to reconnect a timed out session if we have to.
 663          */
 664         wcsession *WCC;
 665
 666         WCC= WC;
 667         WCC->upload_length = 0;
 668         WCC->upload = NULL;
 669         WCC->Hdr->nWildfireHeaders = 0;
 670
 671         if (WCC->Hdr->HR.ContentLength > 0) {
 672                 if (ReadPostData() < 0) {
 673                         return;
 674                 }
 675         }
 676
 677         Buf = NewStrBuf();
 678         WCC->trailing_javascript = NewStrBuf();
 679
 680         /* Convert base64-encoded URL's back to plain text */
 681         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 682                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 683                 StrBufDecodeBase64(WCC->Hdr->this_page);
 684                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 685                 goto SKIP_ALL_THIS_CRAP;
 686         }
 687
 688         /* If there are variables in the URL, we must grab them now */
 689         if (WCC->Hdr->PlainArgs != NULL)
 690                 ParseURLParams(WCC->Hdr->PlainArgs);
 691
 692         /* If the client sent a nonce that is incorrect, kill the request. */
 693         if (havebstr("nonce")) {
 694                 syslog(9, "Comparing supplied nonce %s to session nonce %d\n",
 695                         bstr("nonce"), WCC->nonce
 696                 );
 697                 if (ibstr("nonce") != WCC->nonce) {
 698                         syslog(9, "Ignoring request with mismatched nonce.\n");
 699                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 700                         hprintf("Content-Type: text/plain\r\n");
 701                         begin_burst();
 702                         wc_printf("Security check failed.\r\n");
 703                         end_burst();
 704                         goto SKIP_ALL_THIS_CRAP;
 705                 }
 706         }
 707
 708         /*
 709          * If we're not connected to a Citadel server, try to hook up the connection now.
 710          */
 711         if (!WCC->connected) {
 712                 if (GetConnected()) {
 713                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 714                         hprintf("Content-Type: text/html\r\n");
 715                         begin_burst();
 716                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 717                         wc_printf(_("This program was unable to connect or stay "
 718                                 "connected to the Citadel server.  Please report "
 719                                 "this problem to your system administrator.")
 720                         );
 721                         wc_printf("<br>");
 722                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 723                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 724                                 _("Read More...")
 725                         );
 726                         wc_printf("</body></html>\n");
 727                         end_burst();
 728                         goto SKIP_ALL_THIS_CRAP;
 729                 }
 730         }
 731
 732         /*
 733          * If we're not logged in, but we have authentication data (either from
 734          * a cookie or from http-auth), try logging in to Citadel using that.
 735          */
 736         if ((!WCC->logged_in)
 737             && (StrLength(WCC->Hdr->c_username) > 0)
 738             && (StrLength(WCC->Hdr->c_password) > 0))
 739         {
 740                 long Status;
 741
 742                 FlushStrBuf(Buf);
 743                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 744                 StrBuf_ServGetln(Buf);
 745                 if (GetServerStatus(Buf, &Status) == 3) {
 746                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 747                         StrBuf_ServGetln(Buf);
 748                         if (GetServerStatus(Buf, NULL) == 2) {
 749                                 become_logged_in(WCC->Hdr->c_username,
 750                                                  WCC->Hdr->c_password, Buf);
 751                         } else {
 752                                 /* Should only display when password is wrong */
 753                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 754                                 authorization_required();
 755                                 FreeStrBuf(&Buf);
 756                                 goto SKIP_ALL_THIS_CRAP;
 757                         }
 758                 }
 759                 else if (Status == 541) {
 760                         WCC->logged_in = 1;
 761                 }
 762         }
 763
 764         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 765                 (WCC->Hdr->HR.eReqType != ePOST) &&
 766                 (WCC->Hdr->HR.eReqType != eHEAD);
 767
 768         /*
 769          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 770          * prior to doing anything else.
 771          */
 772         if (havebstr("go")) {
 773                 int ret;
 774                 syslog(9, "Explicit room selection: %s\n", bstr("go"));
 775                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 776                 if ((ret/100) != 2) {
 777                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("go"), ret);
 778                 }
 779         }
 780         else if (havebstr("gotofirst")) {
 781                 int ret;
 782                 syslog(9, "Explicit room selection: %s\n", bstr("gotofirst"));
 783                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 784                 if ((ret/100) != 2) {
 785                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("gotofirst"), ret);
 786                 }
 787         }
 788
 789         /*
 790          * If we aren't in any room yet, but we have cookie data telling us where we're
 791          * supposed to be, and 'go' was not specified, then go there.
 792          */
 793         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 794                 int ret;
 795
 796                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...\n",
 797                         ChrPtr(WCC->CurRoom.name),
 798                         ChrPtr(WCC->Hdr->c_roomname)
 799                 );
 800                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 801                 if ((ret/100) != 2) {
 802                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d\n",
 803                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 804                 }
 805         }
 806
 807         if (WCC->Hdr->HR.Handler != NULL) {
 808                 if (    (!WCC->logged_in)
 809                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 810                         && (WCC->serv_info->serv_supports_guest == 0)
 811                 ) {
 812                         display_login();
 813                 }
 814                 else {
 815 /*
 816                         if ((WCC->Hdr->HR.Handler->Flags & PARSE_REST_URL) != 0)
 817                                 ParseREST_URL();
 818 */
 819                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 820                                 begin_ajax_response();
 821                         WCC->Hdr->HR.Handler->F();
 822                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 823                                 end_ajax_response();
 824                 }
 825         }
 826         /* When all else fails, display the default landing page or a main menu. */
 827         else {
 828                 /*
 829                  * ordinary browser users get a nice login screen, DAV etc. requsets
 830                  * are given a 401 so they can handle it appropriate.
 831                  */
 832                 if (!WCC->logged_in)  {
 833                         if (xhttp) {
 834                                 authorization_required();
 835                         }
 836                         else {
 837                                 display_default_landing_page();
 838                         }
 839                 }
 840                 /*
 841                  * Toplevel dav requests? or just a flat browser request?
 842                  */
 843                 else {
 844                         if (xhttp)
 845                                 dav_main();
 846                         else
 847                                 display_main_menu();
 848                 }
 849         }
 850
 851 SKIP_ALL_THIS_CRAP:
 852         FreeStrBuf(&Buf);
 853         fflush(stdout);
 854 }
 855
 856
 857
 858 /*
 859  * Display the appropriate landing page for this site.
 860  */
 861 void display_default_landing_page(void) {
 862         wcsession *WCC = WC;
 863
 864         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 865                 /* default action */
 866
 867                 if (default_landing_page) {
 868                         http_redirect(default_landing_page);
 869                 }
 870                 else {
 871                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 872                         smart_goto(teh_lobby);
 873                         FreeStrBuf(&teh_lobby);
 874                 }
 875         }
 876         else {
 877                 display_login();
 878         }
 879 }
 880
 881
 882 /*
 883  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 884  */
 885 void sleeeeeeeeeep(int seconds)
 886 {
 887         struct timeval tv;
 888
 889         tv.tv_sec = seconds;
 890         tv.tv_usec = 0;
 891         select(0, NULL, NULL, NULL, &tv);
 892 }
 893
 894 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 895 {
 896         return is_https != 0;
 897 }
 898
 899 void AppendImportantMessage(const char *pch, long len)
 900 {
 901         wcsession *WCC = WC;
 902
 903         if (StrLength(WCC->ImportantMsg) > 0) {
 904                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 905         }
 906
 907         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 908 }
 909
 910 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 911 {
 912         wcsession *WCC = WC;
 913         if (WCC != NULL)
 914                 return (StrLength(WCC->ImportantMsg) > 0);
 915         else
 916                 return 0;
 917 }
 918
 919 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 920 {
 921         wcsession *WCC = WC;
 922
 923         if (WCC != NULL) {
 924                 if (StrLength(WCC->ImportantMsg) > 0) {
 925                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 926                         FlushStrBuf(WCC->ImportantMsg);
 927                 }
 928         }
 929 }
 930
 931 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 932 {
 933         wcsession *WCC = WC;
 934
 935         if (WCC != NULL)
 936                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 937 }
 938
 939 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 940 {
 941         StrBufAppendBuf(Target,
 942                         csslocal, 0);
 943 }
 944
 945 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 946 {
 947         StrBufAppendBufPlain(Target,
 948                              HKEY(PACKAGE_STRING), 0);
 949 }
 950
 951 extern char static_local_dir[PATH_MAX];
 952
 953
 954 void
 955 InitModule_WEBCIT
 956 (void)
 957 {
 958         char dir[SIZ];
 959         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 960         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 961         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 962         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 963         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 964         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 965         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 966
 967         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 968         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 969         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 970         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 971
 972         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 973         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 974         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 975         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 976         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 977
 978
 979         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 980         if (!access(dir, R_OK)) {
 981                 syslog(9, "Using local Stylesheet [%s]\n", dir);
 982                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 983         }
 984         else
 985                 syslog(9, "No Site-local Stylesheet [%s] installed. \n", dir);
 986
 987 }
 988
 989 void
 990 ServerStartModule_WEBCIT
 991 (void)
 992 {
 993         HandlerHash = NewHash(1, NULL);
 994 }
 995
 996
 997 void
 998 ServerShutdownModule_WEBCIT
 999 (void)
1000 {
1001         FreeStrBuf(&csslocal);
1002         DeleteHash(&HandlerHash);
1003 }
1004
1005
1006
1007 void
1008 SessionNewModule_WEBCIT
1009 (wcsession *sess)
1010 {
1011         sess->ImportantMsg = NewStrBuf();
1012         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
1013         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
1014 }
1015
1016 void
1017 SessionDetachModule_WEBCIT
1018 (wcsession *sess)
1019 {
1020         DeleteHash(&sess->Directory);
1021
1022         FreeStrBuf(&sess->upload);
1023         sess->upload_length = 0;
1024
1025         FreeStrBuf(&sess->trailing_javascript);
1026
1027         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1028         {
1029                 FreeStrBuf(&sess->WBuf);
1030                 sess->WBuf = NewStrBuf();
1031         }
1032         else
1033                 FlushStrBuf(sess->WBuf);
1034         FlushStrBuf(sess->HBuf);
1035 }
1036
1037 void
1038 SessionDestroyModule_WEBCIT
1039 (wcsession *sess)
1040 {
1041         FreeStrBuf(&sess->WBuf);
1042         FreeStrBuf(&sess->HBuf);
1043         FreeStrBuf(&sess->ImportantMsg);
1044         FreeStrBuf(&sess->PushedDestination);
1045 }
1046