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 extern int verbose;
  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         if (verbose)
 241                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 242         output_headers(0, 0, 0, 0, 0, is_static);
 243
 244         hprintf("Content-type: %s\r\n"
 245                 "Server: %s\r\n"
 246                 "Connection: close\r\n",
 247                 content_type,
 248                 PACKAGE_STRING);
 249
 250         end_burst();
 251 }
 252
 253 void http_transmit_headers(const char *content_type, int is_static, long is_chunked, int is_gzip)
 254 {
 255         wcsession *WCC = WC;
 256         if (verbose)
 257                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 258         output_headers(0, 0, 0, 0, 0, is_static);
 259
 260         if (is_gzip)
 261                 hprintf("Content-encoding: gzip\r\n");
 262
 263         if (WCC->Hdr->HaveRange)
 264                 hprintf("Accept-Ranges: bytes\r\n"
 265                         "Content-Range: bytes %ld-%ld/%ld\r\n",
 266                         WCC->Hdr->RangeStart,
 267                         WCC->Hdr->RangeTil,
 268                         WCC->Hdr->TotalBytes);
 269
 270         hprintf("Content-type: %s\r\n"
 271                 "Server: "PACKAGE_STRING"\r\n"
 272                 "%s"
 273                 "Connection: close\r\n\r\n",
 274                 content_type,
 275                 (is_chunked)?"Transfer-Encoding: chunked\r\n":"");
 276 }
 277
 278
 279 /*
 280  * Convenience functions to display a page containing only a string
 281  *
 282  * titlebarcolor        color of the titlebar of the frame
 283  * titlebarmsg          text to display in the title bar
 284  * messagetext          body of the box
 285  */
 286 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 287 {
 288         hprintf("HTTP/1.1 200 OK\n");
 289         output_headers(1, 1, 1, 0, 0, 0);
 290         wc_printf("<div id=\"room_banner_override\">\n");
 291         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 292         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 293         wc_printf("</td></tr></table>\n");
 294         wc_printf("</div>\n<div id=\"content\">\n");
 295         escputs(messagetext);
 296         wc_printf("<hr />\n");
 297         wDumpContent(1);
 298 }
 299
 300
 301 /*
 302  * Display a blank page.
 303  */
 304 void blank_page(void) {
 305         output_headers(1, 1, 0, 0, 0, 0);
 306         wDumpContent(2);
 307 }
 308
 309
 310 /*
 311  * A template has been requested
 312  */
 313 void url_do_template(void) {
 314         const StrBuf *MimeType;
 315         const StrBuf *Tmpl = sbstr("template");
 316         begin_burst();
 317         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 318         http_transmit_thing(ChrPtr(MimeType), 0);
 319 }
 320
 321
 322
 323 /*
 324  * convenience function to indicate success
 325  */
 326 void display_success(const char *successmessage)
 327 {
 328         convenience_page("007700", "OK", successmessage);
 329 }
 330
 331
 332 /*
 333  * Authorization required page (sends a 401, causing the browser to request login credentials)
 334  */
 335 void authorization_required(void)
 336 {
 337         wcsession *WCC = WC;
 338         const char *message = "";
 339
 340         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 341         hprintf(
 342                 "Server: %s / %s\r\n"
 343                 "Connection: close\r\n",
 344                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 345         );
 346         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 347
 348         /* if this is a false cookie authentication, remove it to avoid endless loops. */
 349         if (StrLength(WCC->Hdr->HR.RawCookie) > 0)
 350                 stuff_to_cookie(1);
 351
 352         hprintf("Content-Type: text/html\r\n");
 353         begin_burst();
 354         wc_printf("<h1>");
 355         wc_printf(_("Authorization Required"));
 356         wc_printf("</h1>\r\n");
 357
 358         if (WCC->ImportantMsg != NULL) {
 359                 message = ChrPtr(WCC->ImportantMsg);
 360         }
 361
 362         wc_printf(
 363                 _("The resource you requested requires a valid username and password. "
 364                 "You could not be logged in: %s\n"),
 365                 message
 366         );
 367         wDumpContent(0);
 368 }
 369
 370
 371 /*
 372  * Convenience functions to wrap around asynchronous ajax responses
 373  */
 374 void begin_ajax_response(void) {
 375         wcsession *WCC = WC;
 376
 377         FlushStrBuf(WCC->HBuf);
 378         output_headers(0, 0, 0, 0, 0, 0);
 379
 380         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 381                 "Server: %s\r\n"
 382                 "Connection: close\r\n"
 383                 ,
 384                 PACKAGE_STRING);
 385         begin_burst();
 386 }
 387
 388
 389 /*
 390  * print ajax response footer
 391  */
 392 void end_ajax_response(void) {
 393         wDumpContent(0);
 394 }
 395
 396
 397 /*
 398  * Wraps a Citadel server command in an AJAX transaction.
 399  */
 400 void ajax_servcmd(void)
 401 {
 402         wcsession *WCC = WC;
 403         int Done = 0;
 404         StrBuf *Buf;
 405         char *junk;
 406         size_t len;
 407
 408         if (verbose)
 409                 syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 410         begin_ajax_response();
 411         Buf = NewStrBuf();
 412         serv_puts(bstr("g_cmd"));
 413         StrBuf_ServGetln(Buf);
 414         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 415         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 416
 417         switch (GetServerStatus(Buf, NULL)) {
 418         case 8:
 419                 serv_puts("\n\n000");
 420                 if ( (StrLength(Buf)==3) &&
 421                      !strcmp(ChrPtr(Buf), "000")) {
 422                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 423                         break;
 424                 }
 425         case 1:
 426                 while (!Done) {
 427                         if (StrBuf_ServGetln(Buf) < 0)
 428                                 break;
 429                         if ( (StrLength(Buf)==3) &&
 430                              !strcmp(ChrPtr(Buf), "000")) {
 431                                 Done = 1;
 432                         }
 433                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 434                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 435                 }
 436                 break;
 437         case 4:
 438                 text_to_server(bstr("g_input"));
 439                 serv_puts("000");
 440                 break;
 441         case 6:
 442                 len = atol(&ChrPtr(Buf)[4]);
 443                 StrBuf_ServGetBLOBBuffered(Buf, len);
 444                 break;
 445         case 7:
 446                 len = atol(&ChrPtr(Buf)[4]);
 447                 junk = malloc(len);
 448                 memset(junk, 0, len);
 449                 serv_write(junk, len);
 450                 free(junk);
 451         }
 452
 453         end_ajax_response();
 454
 455         /*
 456          * This is kind of an ugly hack, but this is the only place it can go.
 457          * If the command was GEXP, then the instant messenger window must be
 458          * running, so reset the "last_pager_check" watchdog timer so
 459          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 460          */
 461         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 462                 WCC->last_pager_check = time(NULL);
 463         }
 464         FreeStrBuf(&Buf);
 465 }
 466
 467
 468 /*
 469  * Helper function for the asynchronous check to see if we need
 470  * to open the instant messenger window.
 471  */
 472 void seconds_since_last_gexp(void)
 473 {
 474         char buf[256];
 475
 476         if ( (time(NULL) - WC->last_pager_check) < 30) {
 477                 wc_printf("NO\n");
 478         }
 479         else {
 480                 memset(buf, 0, 5);
 481                 serv_puts("NOOP");
 482                 serv_getln(buf, sizeof buf);
 483                 if (buf[3] == '*') {
 484                         wc_printf("YES");
 485                 }
 486                 else {
 487                         wc_printf("NO");
 488                 }
 489         }
 490 }
 491
 492
 493 /*
 494  * Save a URL destination so we can go to it later
 495  */
 496 void push_destination(void) {
 497         wcsession *WCC = WC;
 498
 499         if (!WCC) {
 500                 wc_printf("no session");
 501                 return;
 502         }
 503
 504         FreeStrBuf(&WCC->PushedDestination);
 505         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 506         if (verbose)
 507                 syslog(LOG_DEBUG, "Push: %s", ChrPtr(WCC->PushedDestination));
 508         wc_printf("OK");
 509 }
 510
 511
 512 /*
 513  * Go to the URL saved by push_destination()
 514  */
 515 void pop_destination(void) {
 516         wcsession *WCC = WC;
 517
 518         /*
 519          * If we are in the middle of a new user signup, the server may request that
 520          * we first pass through a registration screen.
 521          */
 522         if ((WCC) && (WCC->need_regi)) {
 523                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 524                         /* Registering will take us to the My Citadel Config room, so save our place */
 525                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 526                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 527                 }
 528                 WCC->need_regi = 0;
 529                 display_reg(1);
 530                 return;
 531         }
 532
 533         /*
 534          * Do something reasonable if we somehow ended up requesting a pop without
 535          * having first done a push.
 536          */
 537         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 538                 do_welcome();
 539                 return;
 540         }
 541
 542         /*
 543          * All righty then!  We have a destination saved, so go there now.
 544          */
 545         if (verbose)
 546                 syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WCC->PushedDestination));
 547         http_redirect(ChrPtr(WCC->PushedDestination));
 548 }
 549
 550
 551
 552 int ReadPostData(void)
 553 {
 554         int rc;
 555         int urlencoded_post = 0;
 556         wcsession *WCC = WC;
 557         StrBuf *content = NULL;
 558
 559         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 560
 561         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 562
 563         if (!urlencoded_post)
 564         {
 565                 StrBufPrintf(content,
 566                      "Content-type: %s\n"
 567                              "Content-length: %ld\n\n",
 568                              ChrPtr(WCC->Hdr->HR.ContentType),
 569                              WCC->Hdr->HR.ContentLength);
 570         }
 571
 572         /** Read the entire input data at once. */
 573         rc = client_read_to(WCC->Hdr, content,
 574                             WCC->Hdr->HR.ContentLength,
 575                             SLEEPING);
 576         if (rc < 0)
 577                 return rc;
 578
 579
 580         if (urlencoded_post) {
 581                 ParseURLParams(content);
 582         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 583                 char *Buf;
 584                 char *BufEnd;
 585                 long len;
 586
 587                 len = StrLength(content);
 588                 Buf = SmashStrBuf(&content);
 589                 BufEnd = Buf + len;
 590                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 591                 free(Buf);
 592         } else if (WCC->Hdr->HR.ContentLength > 0) {
 593                 WCC->upload = content;
 594                 WCC->upload_length = StrLength(WCC->upload);
 595                 content = NULL;
 596         }
 597         FreeStrBuf(&content);
 598         return 1;
 599 }
 600
 601
 602 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 603 {
 604         long Depth, IsDepth;
 605         long offset = 0;
 606         wcsession *WCC = WC;
 607
 608         if (WCC->Hdr->HR.Handler != NULL)
 609                 offset ++;
 610         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 611         IsDepth = GetCount(WCC->Directory) + offset;
 612
 613 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 614         if (Depth < 0) {
 615                 Depth = -Depth;
 616                 return IsDepth > Depth;
 617         }
 618         else
 619                 return Depth == IsDepth;
 620 }
 621
 622
 623
 624 /*
 625  * Entry point for WebCit transaction
 626  */
 627 void session_loop(void)
 628 {
 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->Hdr->nWildfireHeaders = 0;
 642
 643         if (WCC->Hdr->HR.ContentLength > 0) {
 644                 if (ReadPostData() < 0) {
 645                         return;
 646                 }
 647         }
 648
 649         Buf = NewStrBuf();
 650         WCC->trailing_javascript = NewStrBuf();
 651
 652         /* Convert base64-encoded URL's back to plain text */
 653         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 654                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 655                 StrBufDecodeBase64(WCC->Hdr->this_page);
 656                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 657                 goto SKIP_ALL_THIS_CRAP;
 658         }
 659
 660         /* If there are variables in the URL, we must grab them now */
 661         if (WCC->Hdr->PlainArgs != NULL)
 662                 ParseURLParams(WCC->Hdr->PlainArgs);
 663
 664         /* If the client sent a nonce that is incorrect, kill the request. */
 665         if (havebstr("nonce")) {
 666                 if (verbose)
 667                         syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d",
 668                                bstr("nonce"), WCC->nonce
 669                                 );
 670                 if (ibstr("nonce") != WCC->nonce) {
 671                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 672                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 673                         hprintf("Content-Type: text/plain\r\n");
 674                         begin_burst();
 675                         wc_printf("Security check failed.\r\n");
 676                         end_burst();
 677                         goto SKIP_ALL_THIS_CRAP;
 678                 }
 679         }
 680
 681         /*
 682          * If we're not connected to a Citadel server, try to hook up the connection now.
 683          */
 684         if (!WCC->connected) {
 685                 if (GetConnected()) {
 686                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 687                         hprintf("Content-Type: text/html\r\n");
 688                         begin_burst();
 689                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 690                         wc_printf(_("This program was unable to connect or stay "
 691                                 "connected to the Citadel server.  Please report "
 692                                 "this problem to your system administrator.")
 693                         );
 694                         wc_printf("<br>");
 695                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 696                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 697                                 _("Read More...")
 698                         );
 699                         wc_printf("</body></html>\n");
 700                         end_burst();
 701                         goto SKIP_ALL_THIS_CRAP;
 702                 }
 703         }
 704
 705         /*
 706          * If we're not logged in, but we have authentication data (either from
 707          * a cookie or from http-auth), try logging in to Citadel using that.
 708          */
 709         if (    (!WCC->logged_in)
 710                 && (StrLength(WCC->Hdr->c_username) > 0)
 711                 && (StrLength(WCC->Hdr->c_password) > 0)
 712         ) {
 713                 long Status;
 714
 715                 FlushStrBuf(Buf);
 716                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 717                 StrBuf_ServGetln(Buf);
 718                 if (GetServerStatus(Buf, &Status) == 3) {
 719                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 720                         StrBuf_ServGetln(Buf);
 721                         if (GetServerStatus(Buf, NULL) == 2) {
 722                                 become_logged_in(WCC->Hdr->c_username,
 723                                                  WCC->Hdr->c_password, Buf);
 724                         } else {
 725                                 /* Should only display when password is wrong */
 726                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 727                                 authorization_required();
 728                                 FreeStrBuf(&Buf);
 729                                 goto SKIP_ALL_THIS_CRAP;
 730                         }
 731                 }
 732                 else if (Status == 541) {
 733                         WCC->logged_in = 1;
 734                 }
 735         }
 736
 737         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 738                 (WCC->Hdr->HR.eReqType != ePOST) &&
 739                 (WCC->Hdr->HR.eReqType != eHEAD);
 740
 741         /*
 742          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 743          * prior to doing anything else.
 744          */
 745         if (havebstr("go")) {
 746                 int ret;
 747                 if (verbose)
 748                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 749                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 750                 if ((ret/100) != 2) {
 751                         if (verbose)
 752                                 syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 753                 }
 754         }
 755         else if (havebstr("gotofirst")) {
 756                 int ret;
 757                 if (verbose)
 758                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 759                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 760                 if ((ret/100) != 2) {
 761                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 762                 }
 763         }
 764
 765         /*
 766          * If we aren't in any room yet, but we have cookie data telling us where we're
 767          * supposed to be, and 'go' was not specified, then go there.
 768          */
 769         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 770                 int ret;
 771
 772                 if (verbose)
 773                         syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 774                                ChrPtr(WCC->CurRoom.name),
 775                                ChrPtr(WCC->Hdr->c_roomname)
 776                 );
 777                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 778                 if ((ret/100) != 2) {
 779                         if (verbose)
 780                                 syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 781                                        ChrPtr(WCC->Hdr->c_roomname), ret);
 782                 }
 783         }
 784
 785         if (WCC->Hdr->HR.Handler != NULL) {
 786                 if (    (!WCC->logged_in)
 787                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 788                         && (WCC->serv_info != NULL)
 789                         && (WCC->serv_info->serv_supports_guest == 0)
 790                 ) {
 791                         display_login();
 792                 }
 793                 else {
 794                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 795                                 begin_ajax_response();
 796                         }
 797                         WCC->Hdr->HR.Handler->F();
 798                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 799                                 end_ajax_response();
 800                         }
 801                 }
 802         }
 803         /* When all else fails, display the default landing page or a main menu. */
 804         else {
 805                 /*
 806                  * ordinary browser users get a nice login screen, DAV etc. requsets
 807                  * are given a 401 so they can handle it appropriate.
 808                  */
 809                 if (!WCC->logged_in)  {
 810                         if (xhttp) {
 811                                 authorization_required();
 812                         }
 813                         else {
 814                                 display_default_landing_page();
 815                         }
 816                 }
 817                 /*
 818                  * Toplevel dav requests? or just a flat browser request?
 819                  */
 820                 else {
 821                         if (xhttp) {
 822                                 dav_main();
 823                         }
 824                         else {
 825                                 display_main_menu();
 826                         }
 827                 }
 828         }
 829
 830 SKIP_ALL_THIS_CRAP:
 831         FreeStrBuf(&Buf);
 832         fflush(stdout);
 833 }
 834
 835
 836
 837 /*
 838  * Display the appropriate landing page for this site.
 839  */
 840 void display_default_landing_page(void) {
 841         wcsession *WCC = WC;
 842
 843         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 844                 /* default action */
 845
 846                 if (havebstr("go")) {
 847                         if (verbose)
 848                                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 849                         smart_goto(sbstr("go"));
 850                 }
 851                 else if (default_landing_page) {
 852                         http_redirect(default_landing_page);
 853                 }
 854                 else {
 855                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 856                         smart_goto(teh_lobby);
 857                         FreeStrBuf(&teh_lobby);
 858                 }
 859         }
 860         else {
 861                 display_login();
 862         }
 863 }
 864
 865
 866 /*
 867  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 868  */
 869 void sleeeeeeeeeep(int seconds)
 870 {
 871         struct timeval tv;
 872
 873         tv.tv_sec = seconds;
 874         tv.tv_usec = 0;
 875         select(0, NULL, NULL, NULL, &tv);
 876 }
 877
 878 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 879 {
 880         return is_https != 0;
 881 }
 882
 883 void AppendImportantMessage(const char *pch, long len)
 884 {
 885         wcsession *WCC = WC;
 886
 887         if (StrLength(WCC->ImportantMsg) > 0) {
 888                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 889         }
 890
 891         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 892 }
 893
 894 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 895 {
 896         wcsession *WCC = WC;
 897         if (WCC != NULL)
 898                 return (StrLength(WCC->ImportantMsg) > 0);
 899         else
 900                 return 0;
 901 }
 902
 903 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 904 {
 905         wcsession *WCC = WC;
 906
 907         if (WCC != NULL) {
 908                 if (StrLength(WCC->ImportantMsg) > 0) {
 909                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 910                 }
 911         }
 912 }
 913
 914 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 915 {
 916         wcsession *WCC = WC;
 917
 918         if (WCC != NULL)
 919                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 920 }
 921
 922 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 923 {
 924         StrBufAppendBuf(Target,
 925                         csslocal, 0);
 926 }
 927
 928 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 929 {
 930         StrBufAppendBufPlain(Target,
 931                              HKEY(PACKAGE_STRING), 0);
 932 }
 933
 934 extern char static_local_dir[PATH_MAX];
 935
 936
 937 void
 938 InitModule_WEBCIT
 939 (void)
 940 {
 941         char dir[SIZ];
 942         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 943         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 944         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 945         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 946         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 947         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 948         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 949         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 950
 951         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 952         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 953         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 954         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 955
 956         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 957         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 958         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 959         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 960         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 961
 962
 963         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 964         if (!access(dir, R_OK)) {
 965                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 966                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 967         }
 968         else
 969                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 970
 971 }
 972
 973 void
 974 ServerStartModule_WEBCIT
 975 (void)
 976 {
 977         HandlerHash = NewHash(1, NULL);
 978 }
 979
 980
 981 void
 982 ServerShutdownModule_WEBCIT
 983 (void)
 984 {
 985         FreeStrBuf(&csslocal);
 986         DeleteHash(&HandlerHash);
 987 }
 988
 989
 990
 991 void
 992 SessionNewModule_WEBCIT
 993 (wcsession *sess)
 994 {
 995         sess->ImportantMsg = NewStrBuf();
 996         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 997         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 998 }
 999
1000 void
1001 SessionDetachModule_WEBCIT
1002 (wcsession *sess)
1003 {
1004         DeleteHash(&sess->Directory);
1005
1006         FreeStrBuf(&sess->upload);
1007         sess->upload_length = 0;
1008
1009         FreeStrBuf(&sess->trailing_javascript);
1010
1011         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1012         {
1013                 FreeStrBuf(&sess->WBuf);
1014                 sess->WBuf = NewStrBuf();
1015         }
1016         else
1017                 FlushStrBuf(sess->WBuf);
1018         FlushStrBuf(sess->HBuf);
1019         if (StrLength(sess->ImportantMsg) > 0) {
1020                 FlushStrBuf(sess->ImportantMsg);
1021         }
1022
1023 }
1024
1025 void
1026 SessionDestroyModule_WEBCIT
1027 (wcsession *sess)
1028 {
1029         FreeStrBuf(&sess->WBuf);
1030         FreeStrBuf(&sess->HBuf);
1031         FreeStrBuf(&sess->ImportantMsg);
1032         FreeStrBuf(&sess->PushedDestination);
1033 }
1034