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