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