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) 1996-2013 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
  12 #define SHOW_ME_VAPPEND_PRINTF
  13 #include <stdio.h>
  14 #include <stdarg.h>
  15 #include "webcit.h"
  16 #include "dav.h"
  17 #include "webserver.h"
  18
  19 StrBuf *csslocal = NULL;
  20 HashList *HandlerHash = NULL;
  21
  22 void stuff_to_cookie(int unset_cookie);
  23 extern int GetConnected(void);
  24
  25
  26 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  27 {
  28         wcsession *WCC = WC;
  29         int n;
  30
  31         n = GetCount(WCC->Hdr->HTTPHeaders);
  32         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  33 }
  34
  35 void DeleteWebcitHandler(void *vHandler)
  36 {
  37         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  38         FreeStrBuf(&Handler->Name);
  39         FreeStrBuf(&Handler->DisplayName);
  40         free (Handler);
  41 }
  42
  43 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  44                          const char *DisplayName, long dslen,
  45                          WebcitHandlerFunc F,
  46                          long Flags)
  47 {
  48         WebcitHandler *NewHandler;
  49         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  50         NewHandler->F = F;
  51         NewHandler->Flags = Flags;
  52         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  53         StrBufShrinkToFit(NewHandler->Name, 1);
  54         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  55         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  56         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  57 }
  58
  59 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  60 {
  61         wcsession *WCC = WC;
  62         if (WCC->Hdr->HR.Handler != NULL)
  63                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  64 }
  65
  66
  67 /*
  68  * web-printing funcion. uses our vsnprintf wrapper
  69  */
  70 #ifdef UBER_VERBOSE_DEBUGGING
  71 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  72 #else
  73 void wc_printf(const char *format,...)
  74 #endif
  75 {
  76         wcsession *WCC = WC;
  77         va_list arg_ptr;
  78
  79         if (WCC->WBuf == NULL)
  80                 WCC->WBuf = NewStrBuf();
  81 #ifdef UBER_VERBOSE_DEBUGGING
  82         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  83 #endif
  84
  85         va_start(arg_ptr, format);
  86         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  87         va_end(arg_ptr);
  88 #ifdef UBER_VERBOSE_DEBUGGING
  89         StrBufAppendPrintf(WCC->WBuf, "]\n");
  90 #endif
  91 }
  92
  93 /*
  94  * http-header-printing funcion. uses our vsnprintf wrapper
  95  */
  96 void hprintf(const char *format,...)
  97 {
  98         wcsession *WCC = WC;
  99         va_list arg_ptr;
 100
 101         va_start(arg_ptr, format);
 102         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 103         va_end(arg_ptr);
 104 }
 105
 106
 107
 108 /*
 109  * wrap up an HTTP session, closes tags, etc.
 110  *
 111  * print_standard_html_footer should be set to:
 112  * 0            - to transmit only,
 113  * nonzero      - to append the closing tags
 114  */
 115 void wDumpContent(int print_standard_html_footer)
 116 {
 117         if (print_standard_html_footer) {
 118                 wc_printf("</div> <!-- end of 'content' div -->\n");
 119                 do_template("trailing");
 120         }
 121
 122         /* If we've been saving it all up for one big output burst,
 123          * go ahead and do that now.
 124          */
 125         end_burst();
 126 }
 127
 128
 129
 130
 131 /*
 132  * Output HTTP headers and leading HTML for a page
 133  */
 134 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 135                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 136                         int do_room_banner,     /* 1 = include the room banner and <div id="content"></div> */
 137                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 138                         int suppress_check,     /* 1 = suppress check for instant messages        */
 139                         int cache               /* 1 = allow browser to cache this page      */
 140 ) {
 141         wcsession *WCC = WC;
 142         char httpnow[128];
 143
 144         if (WCC->Hdr->HaveRange > 1)
 145                 hprintf("HTTP/1.1 206 Partial Content\r\n");
 146         else
 147                 hprintf("HTTP/1.1 200 OK\r\n");
 148
 149         http_datestring(httpnow, sizeof httpnow, time(NULL));
 150
 151         if (do_httpheaders) {
 152                 if (WCC->serv_info != NULL)
 153                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 154                                 "Server: %s / %s\n"
 155                                 "Connection: close\r\n",
 156                                 PACKAGE_STRING,
 157                                 ChrPtr(WCC->serv_info->serv_software));
 158                 else
 159                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 160                                 "Server: %s / [n/a]\n"
 161                                 "Connection: close\r\n",
 162                                 PACKAGE_STRING);
 163         }
 164
 165         if (cache > 0) {
 166                 char httpTomorow[128];
 167
 168                 http_datestring(httpTomorow, sizeof httpTomorow,
 169                                 time(NULL) + 60 * 60 * 24 * 2);
 170
 171                 hprintf("Pragma: public\r\n"
 172                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 173                         "Last-modified: %s\r\n"
 174                         "Expires: %s\r\n",
 175                         httpnow,
 176                         httpTomorow
 177                 );
 178         }
 179         else {
 180                 hprintf("Pragma: no-cache\r\n"
 181                         "Cache-Control: no-store\r\n"
 182                         "Expires: -1\r\n"
 183                 );
 184         }
 185
 186         if (cache < 2) stuff_to_cookie(unset_cookies);
 187
 188         if (do_htmlhead) {
 189                 begin_burst();
 190                 do_template("head");
 191                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 192                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 193                 }
 194                 if (do_room_banner) {
 195                         tmplput_roombanner(NULL, NULL);
 196                 }
 197         }
 198
 199         if (do_room_banner) {
 200                 wc_printf("<div id=\"content\">\n");
 201         }
 202 }
 203
 204 void output_custom_content_header(const char *ctype) {
 205         hprintf("HTTP/1.1 200 OK\r\n");
 206         hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 207         hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 208         hprintf("Connection: close\r\n");
 209 }
 210
 211
 212 /*
 213  * Generic function to do an HTTP redirect.  Easy and fun.
 214  */
 215 void http_redirect(const char *whichpage) {
 216         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 217         hprintf("Location: %s\r\n", whichpage);
 218         hprintf("URI: %s\r\n", whichpage);
 219         hprintf("Content-type: text/html; charset=utf-8\r\n");
 220         stuff_to_cookie(0);
 221         begin_burst();
 222         wc_printf("<html><body>");
 223         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 224         wc_printf("</body></html>\n");
 225         end_burst();
 226 }
 227
 228
 229
 230 /*
 231  * Output a piece of content to the web browser using conformant HTTP and MIME semantics.
 232  *
 233  * If this function is called, it is expected that begin_burst() has already been called
 234  * and some sort of content has been fed into the buffer.  This function will transmit a
 235  * bunch of headers to the client.  end_burst() will add some headers of its own, and then
 236  * transmit the buffered content to the client.
 237  */
 238 void http_transmit_thing(const char *content_type, int is_static)
 239 {
 240         syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 241         output_headers(0, 0, 0, 0, 0, is_static);
 242
 243         hprintf("Content-type: %s\r\n"
 244                 "Server: %s\r\n"
 245                 "Connection: close\r\n",
 246                 content_type,
 247                 PACKAGE_STRING);
 248
 249         end_burst();
 250 }
 251
 252 void http_transmit_headers(const char *content_type, int is_static, long is_chunked, int is_gzip)
 253 {
 254         wcsession *WCC = WC;
 255         syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 256         output_headers(0, 0, 0, 0, 0, is_static);
 257
 258         if (is_gzip)
 259                 hprintf("Content-encoding: gzip\r\n");
 260
 261         if (WCC->Hdr->HaveRange)
 262                 hprintf("Accept-Ranges: bytes\r\n"
 263                         "Content-Range: bytes %ld-%ld/%ld\r\n",
 264                         WCC->Hdr->RangeStart,
 265                         WCC->Hdr->RangeTil,
 266                         WCC->Hdr->TotalBytes);
 267
 268         hprintf("Content-type: %s\r\n"
 269                 "Server: "PACKAGE_STRING"\r\n"
 270                 "%s"
 271                 "Connection: close\r\n\r\n",
 272                 content_type,
 273                 (is_chunked)?"Transfer-Encoding: chunked\r\n":"");
 274 }
 275
 276
 277 /*
 278  * Convenience functions to display a page containing only a string
 279  *
 280  * titlebarcolor        color of the titlebar of the frame
 281  * titlebarmsg          text to display in the title bar
 282  * messagetext          body of the box
 283  */
 284 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 285 {
 286         hprintf("HTTP/1.1 200 OK\n");
 287         output_headers(1, 1, 1, 0, 0, 0);
 288         wc_printf("<div id=\"room_banner_override\">\n");
 289         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 290         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 291         wc_printf("</td></tr></table>\n");
 292         wc_printf("</div>\n<div id=\"content\">\n");
 293         escputs(messagetext);
 294         wc_printf("<hr />\n");
 295         wDumpContent(1);
 296 }
 297
 298
 299 /*
 300  * Display a blank page.
 301  */
 302 void blank_page(void) {
 303         output_headers(1, 1, 0, 0, 0, 0);
 304         wDumpContent(2);
 305 }
 306
 307
 308 /*
 309  * A template has been requested
 310  */
 311 void url_do_template(void) {
 312         const StrBuf *MimeType;
 313         const StrBuf *Tmpl = sbstr("template");
 314         begin_burst();
 315         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 316         http_transmit_thing(ChrPtr(MimeType), 0);
 317 }
 318
 319
 320
 321 /*
 322  * convenience function to indicate success
 323  */
 324 void display_success(const char *successmessage)
 325 {
 326         convenience_page("007700", "OK", successmessage);
 327 }
 328
 329
 330 /*
 331  * Authorization required page (sends a 401, causing the browser to request login credentials)
 332  */
 333 void authorization_required(void)
 334 {
 335         wcsession *WCC = WC;
 336         const char *message = "";
 337
 338         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 339         hprintf(
 340                 "Server: %s / %s\r\n"
 341                 "Connection: close\r\n",
 342                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 343         );
 344         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 345
 346         /* if this is a false cookie authentication, remove it to avoid endless loops. */
 347         if (StrLength(WCC->Hdr->HR.RawCookie) > 0)
 348                 stuff_to_cookie(1);
 349
 350         hprintf("Content-Type: text/html\r\n");
 351         begin_burst();
 352         wc_printf("<h1>");
 353         wc_printf(_("Authorization Required"));
 354         wc_printf("</h1>\r\n");
 355
 356         if (WCC->ImportantMsg != NULL) {
 357                 message = ChrPtr(WCC->ImportantMsg);
 358         }
 359
 360         wc_printf(
 361                 _("The resource you requested requires a valid username and password. "
 362                 "You could not be logged in: %s\n"),
 363                 message
 364         );
 365         wDumpContent(0);
 366 }
 367
 368
 369 /*
 370  * Convenience functions to wrap around asynchronous ajax responses
 371  */
 372 void begin_ajax_response(void) {
 373         wcsession *WCC = WC;
 374
 375         FlushStrBuf(WCC->HBuf);
 376         output_headers(0, 0, 0, 0, 0, 0);
 377
 378         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 379                 "Server: %s\r\n"
 380                 "Connection: close\r\n"
 381                 ,
 382                 PACKAGE_STRING);
 383         begin_burst();
 384 }
 385
 386
 387 /*
 388  * print ajax response footer
 389  */
 390 void end_ajax_response(void) {
 391         wDumpContent(0);
 392 }
 393
 394
 395 /*
 396  * Wraps a Citadel server command in an AJAX transaction.
 397  */
 398 void ajax_servcmd(void)
 399 {
 400         wcsession *WCC = WC;
 401         int Done = 0;
 402         StrBuf *Buf;
 403         char *junk;
 404         size_t len;
 405
 406         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 407         begin_ajax_response();
 408         Buf = NewStrBuf();
 409         serv_puts(bstr("g_cmd"));
 410         StrBuf_ServGetln(Buf);
 411         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 412         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 413
 414         switch (GetServerStatus(Buf, NULL)) {
 415         case 8:
 416                 serv_puts("\n\n000");
 417                 if ( (StrLength(Buf)==3) &&
 418                      !strcmp(ChrPtr(Buf), "000")) {
 419                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 420                         break;
 421                 }
 422         case 1:
 423                 while (!Done) {
 424                         if (StrBuf_ServGetln(Buf) < 0)
 425                                 break;
 426                         if ( (StrLength(Buf)==3) &&
 427                              !strcmp(ChrPtr(Buf), "000")) {
 428                                 Done = 1;
 429                         }
 430                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 431                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 432                 }
 433                 break;
 434         case 4:
 435                 text_to_server(bstr("g_input"));
 436                 serv_puts("000");
 437                 break;
 438         case 6:
 439                 len = atol(&ChrPtr(Buf)[4]);
 440                 StrBuf_ServGetBLOBBuffered(Buf, len);
 441                 break;
 442         case 7:
 443                 len = atol(&ChrPtr(Buf)[4]);
 444                 junk = malloc(len);
 445                 memset(junk, 0, len);
 446                 serv_write(junk, len);
 447                 free(junk);
 448         }
 449
 450         end_ajax_response();
 451
 452         /*
 453          * This is kind of an ugly hack, but this is the only place it can go.
 454          * If the command was GEXP, then the instant messenger window must be
 455          * running, so reset the "last_pager_check" watchdog timer so
 456          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 457          */
 458         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 459                 WCC->last_pager_check = time(NULL);
 460         }
 461         FreeStrBuf(&Buf);
 462 }
 463
 464
 465 /*
 466  * Helper function for the asynchronous check to see if we need
 467  * to open the instant messenger window.
 468  */
 469 void seconds_since_last_gexp(void)
 470 {
 471         char buf[256];
 472
 473         if ( (time(NULL) - WC->last_pager_check) < 30) {
 474                 wc_printf("NO\n");
 475         }
 476         else {
 477                 memset(buf, 0, 5);
 478                 serv_puts("NOOP");
 479                 serv_getln(buf, sizeof buf);
 480                 if (buf[3] == '*') {
 481                         wc_printf("YES");
 482                 }
 483                 else {
 484                         wc_printf("NO");
 485                 }
 486         }
 487 }
 488
 489
 490 /*
 491  * Save a URL destination so we can go to it later
 492  */
 493 void push_destination(void) {
 494         wcsession *WCC = WC;
 495
 496         if (!WCC) {
 497                 wc_printf("no session");
 498                 return;
 499         }
 500
 501         FreeStrBuf(&WCC->PushedDestination);
 502         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 503         syslog(LOG_DEBUG, "Push: %s", ChrPtr(WCC->PushedDestination));
 504         wc_printf("OK");
 505 }
 506
 507
 508 /*
 509  * Go to the URL saved by push_destination()
 510  */
 511 void pop_destination(void) {
 512         wcsession *WCC = WC;
 513
 514         /*
 515          * If we are in the middle of a new user signup, the server may request that
 516          * we first pass through a registration screen.
 517          */
 518         if ((WCC) && (WCC->need_regi)) {
 519                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 520                         /* Registering will take us to the My Citadel Config room, so save our place */
 521                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 522                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 523                 }
 524                 WCC->need_regi = 0;
 525                 display_reg(1);
 526                 return;
 527         }
 528
 529         /*
 530          * Do something reasonable if we somehow ended up requesting a pop without
 531          * having first done a push.
 532          */
 533         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 534                 do_welcome();
 535                 return;
 536         }
 537
 538         /*
 539          * All righty then!  We have a destination saved, so go there now.
 540          */
 541         syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WCC->PushedDestination));
 542         http_redirect(ChrPtr(WCC->PushedDestination));
 543 }
 544
 545
 546
 547 int ReadPostData(void)
 548 {
 549         int rc;
 550         int urlencoded_post = 0;
 551         wcsession *WCC = WC;
 552         StrBuf *content = NULL;
 553
 554         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 555
 556         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 557
 558         if (!urlencoded_post)
 559         {
 560                 StrBufPrintf(content,
 561                      "Content-type: %s\n"
 562                              "Content-length: %ld\n\n",
 563                              ChrPtr(WCC->Hdr->HR.ContentType),
 564                              WCC->Hdr->HR.ContentLength);
 565         }
 566
 567         /** Read the entire input data at once. */
 568         rc = client_read_to(WCC->Hdr, content,
 569                             WCC->Hdr->HR.ContentLength,
 570                             SLEEPING);
 571         if (rc < 0)
 572                 return rc;
 573
 574
 575         if (urlencoded_post) {
 576                 ParseURLParams(content);
 577         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 578                 char *Buf;
 579                 char *BufEnd;
 580                 long len;
 581
 582                 len = StrLength(content);
 583                 Buf = SmashStrBuf(&content);
 584                 BufEnd = Buf + len;
 585                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 586                 free(Buf);
 587         } else if (WCC->Hdr->HR.ContentLength > 0) {
 588                 WCC->upload = content;
 589                 WCC->upload_length = StrLength(WCC->upload);
 590                 content = NULL;
 591         }
 592         FreeStrBuf(&content);
 593         return 1;
 594 }
 595
 596
 597 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 598 {
 599         long Depth, IsDepth;
 600         long offset = 0;
 601         wcsession *WCC = WC;
 602
 603         if (WCC->Hdr->HR.Handler != NULL)
 604                 offset ++;
 605         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 606         IsDepth = GetCount(WCC->Directory) + offset;
 607
 608 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 609         if (Depth < 0) {
 610                 Depth = -Depth;
 611                 return IsDepth > Depth;
 612         }
 613         else
 614                 return Depth == IsDepth;
 615 }
 616
 617
 618
 619 /*
 620  * Entry point for WebCit transaction
 621  */
 622 void session_loop(void)
 623 {
 624         int xhttp;
 625         StrBuf *Buf;
 626
 627         /*
 628          * We stuff these with the values coming from the client cookies,
 629          * so we can use them to reconnect a timed out session if we have to.
 630          */
 631         wcsession *WCC;
 632
 633         WCC= WC;
 634         WCC->upload_length = 0;
 635         WCC->upload = NULL;
 636         WCC->Hdr->nWildfireHeaders = 0;
 637
 638         if (WCC->Hdr->HR.ContentLength > 0) {
 639                 if (ReadPostData() < 0) {
 640                         return;
 641                 }
 642         }
 643
 644         Buf = NewStrBuf();
 645         WCC->trailing_javascript = NewStrBuf();
 646
 647         /* Convert base64-encoded URL's back to plain text */
 648         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 649                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 650                 StrBufDecodeBase64(WCC->Hdr->this_page);
 651                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 652                 goto SKIP_ALL_THIS_CRAP;
 653         }
 654
 655         /* If there are variables in the URL, we must grab them now */
 656         if (WCC->Hdr->PlainArgs != NULL)
 657                 ParseURLParams(WCC->Hdr->PlainArgs);
 658
 659         /* If the client sent a nonce that is incorrect, kill the request. */
 660         if (havebstr("nonce")) {
 661                 syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d",
 662                         bstr("nonce"), WCC->nonce
 663                 );
 664                 if (ibstr("nonce") != WCC->nonce) {
 665                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 666                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 667                         hprintf("Content-Type: text/plain\r\n");
 668                         begin_burst();
 669                         wc_printf("Security check failed.\r\n");
 670                         end_burst();
 671                         goto SKIP_ALL_THIS_CRAP;
 672                 }
 673         }
 674
 675         /*
 676          * If we're not connected to a Citadel server, try to hook up the connection now.
 677          */
 678         if (!WCC->connected) {
 679                 if (GetConnected()) {
 680                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 681                         hprintf("Content-Type: text/html\r\n");
 682                         begin_burst();
 683                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 684                         wc_printf(_("This program was unable to connect or stay "
 685                                 "connected to the Citadel server.  Please report "
 686                                 "this problem to your system administrator.")
 687                         );
 688                         wc_printf("<br>");
 689                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 690                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 691                                 _("Read More...")
 692                         );
 693                         wc_printf("</body></html>\n");
 694                         end_burst();
 695                         goto SKIP_ALL_THIS_CRAP;
 696                 }
 697         }
 698
 699         /*
 700          * If we're not logged in, but we have authentication data (either from
 701          * a cookie or from http-auth), try logging in to Citadel using that.
 702          */
 703         if (    (!WCC->logged_in)
 704                 && (StrLength(WCC->Hdr->c_username) > 0)
 705                 && (StrLength(WCC->Hdr->c_password) > 0)
 706         ) {
 707                 long Status;
 708
 709                 FlushStrBuf(Buf);
 710                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 711                 StrBuf_ServGetln(Buf);
 712                 if (GetServerStatus(Buf, &Status) == 3) {
 713                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 714                         StrBuf_ServGetln(Buf);
 715                         if (GetServerStatus(Buf, NULL) == 2) {
 716                                 become_logged_in(WCC->Hdr->c_username,
 717                                                  WCC->Hdr->c_password, Buf);
 718                         } else {
 719                                 /* Should only display when password is wrong */
 720                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 721                                 authorization_required();
 722                                 FreeStrBuf(&Buf);
 723                                 goto SKIP_ALL_THIS_CRAP;
 724                         }
 725                 }
 726                 else if (Status == 541) {
 727                         WCC->logged_in = 1;
 728                 }
 729         }
 730
 731         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 732                 (WCC->Hdr->HR.eReqType != ePOST) &&
 733                 (WCC->Hdr->HR.eReqType != eHEAD);
 734
 735         /*
 736          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 737          * prior to doing anything else.
 738          */
 739         if (havebstr("go")) {
 740                 int ret;
 741                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 742                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 743                 if ((ret/100) != 2) {
 744                         syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 745                 }
 746         }
 747         else if (havebstr("gotofirst")) {
 748                 int ret;
 749                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 750                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 751                 if ((ret/100) != 2) {
 752                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 753                 }
 754         }
 755
 756         /*
 757          * If we aren't in any room yet, but we have cookie data telling us where we're
 758          * supposed to be, and 'go' was not specified, then go there.
 759          */
 760         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 761                 int ret;
 762
 763                 syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 764                         ChrPtr(WCC->CurRoom.name),
 765                         ChrPtr(WCC->Hdr->c_roomname)
 766                 );
 767                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 768                 if ((ret/100) != 2) {
 769                         syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 770                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 771                 }
 772         }
 773
 774         if (WCC->Hdr->HR.Handler != NULL) {
 775                 if (    (!WCC->logged_in)
 776                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 777                         && (WCC->serv_info != NULL)
 778                         && (WCC->serv_info->serv_supports_guest == 0)
 779                 ) {
 780                         display_login();
 781                 }
 782                 else {
 783                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 784                                 begin_ajax_response();
 785                         }
 786                         WCC->Hdr->HR.Handler->F();
 787                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 788                                 end_ajax_response();
 789                         }
 790                 }
 791         }
 792         /* When all else fails, display the default landing page or a main menu. */
 793         else {
 794                 /*
 795                  * ordinary browser users get a nice login screen, DAV etc. requsets
 796                  * are given a 401 so they can handle it appropriate.
 797                  */
 798                 if (!WCC->logged_in)  {
 799                         if (xhttp) {
 800                                 authorization_required();
 801                         }
 802                         else {
 803                                 display_default_landing_page();
 804                         }
 805                 }
 806                 /*
 807                  * Toplevel dav requests? or just a flat browser request?
 808                  */
 809                 else {
 810                         if (xhttp) {
 811                                 dav_main();
 812                         }
 813                         else {
 814                                 display_main_menu();
 815                         }
 816                 }
 817         }
 818
 819 SKIP_ALL_THIS_CRAP:
 820         FreeStrBuf(&Buf);
 821         fflush(stdout);
 822 }
 823
 824
 825
 826 /*
 827  * Display the appropriate landing page for this site.
 828  */
 829 void display_default_landing_page(void) {
 830         wcsession *WCC = WC;
 831
 832         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 833                 /* default action */
 834
 835                 if (havebstr("go")) {
 836                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 837                         smart_goto(sbstr("go"));
 838                 }
 839                 else if (default_landing_page) {
 840                         http_redirect(default_landing_page);
 841                 }
 842                 else {
 843                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 844                         smart_goto(teh_lobby);
 845                         FreeStrBuf(&teh_lobby);
 846                 }
 847         }
 848         else {
 849                 display_login();
 850         }
 851 }
 852
 853
 854 /*
 855  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 856  */
 857 void sleeeeeeeeeep(int seconds)
 858 {
 859         struct timeval tv;
 860
 861         tv.tv_sec = seconds;
 862         tv.tv_usec = 0;
 863         select(0, NULL, NULL, NULL, &tv);
 864 }
 865
 866 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 867 {
 868         return is_https != 0;
 869 }
 870
 871 void AppendImportantMessage(const char *pch, long len)
 872 {
 873         wcsession *WCC = WC;
 874
 875         if (StrLength(WCC->ImportantMsg) > 0) {
 876                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 877         }
 878
 879         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 880 }
 881
 882 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 883 {
 884         wcsession *WCC = WC;
 885         if (WCC != NULL)
 886                 return (StrLength(WCC->ImportantMsg) > 0);
 887         else
 888                 return 0;
 889 }
 890
 891 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 892 {
 893         wcsession *WCC = WC;
 894
 895         if (WCC != NULL) {
 896                 if (StrLength(WCC->ImportantMsg) > 0) {
 897                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 898                 }
 899         }
 900 }
 901
 902 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 903 {
 904         wcsession *WCC = WC;
 905
 906         if (WCC != NULL)
 907                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 908 }
 909
 910 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 911 {
 912         StrBufAppendBuf(Target,
 913                         csslocal, 0);
 914 }
 915
 916 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 917 {
 918         StrBufAppendBufPlain(Target,
 919                              HKEY(PACKAGE_STRING), 0);
 920 }
 921
 922 extern char static_local_dir[PATH_MAX];
 923
 924
 925 void
 926 InitModule_WEBCIT
 927 (void)
 928 {
 929         char dir[SIZ];
 930         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 931         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 932         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 933         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 934         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 935         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 936         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 937         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 938
 939         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 940         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 941         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 942         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 943
 944         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 945         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 946         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 947         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 948         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 949
 950
 951         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 952         if (!access(dir, R_OK)) {
 953                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 954                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 955         }
 956         else
 957                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 958
 959 }
 960
 961 void
 962 ServerStartModule_WEBCIT
 963 (void)
 964 {
 965         HandlerHash = NewHash(1, NULL);
 966 }
 967
 968
 969 void
 970 ServerShutdownModule_WEBCIT
 971 (void)
 972 {
 973         FreeStrBuf(&csslocal);
 974         DeleteHash(&HandlerHash);
 975 }
 976
 977
 978
 979 void
 980 SessionNewModule_WEBCIT
 981 (wcsession *sess)
 982 {
 983         sess->ImportantMsg = NewStrBuf();
 984         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 985         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 986 }
 987
 988 void
 989 SessionDetachModule_WEBCIT
 990 (wcsession *sess)
 991 {
 992         DeleteHash(&sess->Directory);
 993
 994         FreeStrBuf(&sess->upload);
 995         sess->upload_length = 0;
 996
 997         FreeStrBuf(&sess->trailing_javascript);
 998
 999         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1000         {
1001                 FreeStrBuf(&sess->WBuf);
1002                 sess->WBuf = NewStrBuf();
1003         }
1004         else
1005                 FlushStrBuf(sess->WBuf);
1006         FlushStrBuf(sess->HBuf);
1007         if (StrLength(sess->ImportantMsg) > 0) {
1008                 FlushStrBuf(sess->ImportantMsg);
1009         }
1010
1011 }
1012
1013 void
1014 SessionDestroyModule_WEBCIT
1015 (wcsession *sess)
1016 {
1017         FreeStrBuf(&sess->WBuf);
1018         FreeStrBuf(&sess->HBuf);
1019         FreeStrBuf(&sess->ImportantMsg);
1020         FreeStrBuf(&sess->PushedDestination);
1021 }
1022