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