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)
 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 (WCC->Hdr->HaveRange)
 259                 hprintf("Accept-Ranges: bytes\r\n"
 260                         "Content-Range: bytes %ld-%ld/%ld\r\n",
 261                         WCC->Hdr->RangeStart,
 262                         WCC->Hdr->RangeTil,
 263                         WCC->Hdr->TotalBytes);
 264
 265         hprintf("Content-type: %s\r\n"
 266                 "Server: "PACKAGE_STRING"\r\n"
 267                 "%s"
 268                 "Connection: close\r\n\r\n",
 269                 content_type,
 270                 (is_chunked)?"Transfer-Encoding: chunked\r\n":"");
 271 }
 272
 273
 274 /*
 275  * Convenience functions to display a page containing only a string
 276  *
 277  * titlebarcolor        color of the titlebar of the frame
 278  * titlebarmsg          text to display in the title bar
 279  * messagetext          body of the box
 280  */
 281 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 282 {
 283         hprintf("HTTP/1.1 200 OK\n");
 284         output_headers(1, 1, 1, 0, 0, 0);
 285         wc_printf("<div id=\"room_banner_override\">\n");
 286         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 287         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 288         wc_printf("</td></tr></table>\n");
 289         wc_printf("</div>\n<div id=\"content\">\n");
 290         escputs(messagetext);
 291         wc_printf("<hr />\n");
 292         wDumpContent(1);
 293 }
 294
 295
 296 /*
 297  * Display a blank page.
 298  */
 299 void blank_page(void) {
 300         output_headers(1, 1, 0, 0, 0, 0);
 301         wDumpContent(2);
 302 }
 303
 304
 305 /*
 306  * A template has been requested
 307  */
 308 void url_do_template(void) {
 309         const StrBuf *MimeType;
 310         const StrBuf *Tmpl = sbstr("template");
 311         begin_burst();
 312         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 313         http_transmit_thing(ChrPtr(MimeType), 0);
 314 }
 315
 316
 317
 318 /*
 319  * convenience function to indicate success
 320  */
 321 void display_success(const char *successmessage)
 322 {
 323         convenience_page("007700", "OK", successmessage);
 324 }
 325
 326
 327 /*
 328  * Authorization required page (sends a 401, causing the browser to request login credentials)
 329  */
 330 void authorization_required(void)
 331 {
 332         wcsession *WCC = WC;
 333         const char *message = "";
 334
 335         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 336         hprintf(
 337                 "Server: %s / %s\r\n"
 338                 "Connection: close\r\n",
 339                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 340         );
 341         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 342
 343         /* if this is a false cookie authentication, remove it to avoid endless loops. */
 344         if (StrLength(WCC->Hdr->HR.RawCookie) > 0)
 345                 stuff_to_cookie(1);
 346
 347         hprintf("Content-Type: text/html\r\n");
 348         begin_burst();
 349         wc_printf("<h1>");
 350         wc_printf(_("Authorization Required"));
 351         wc_printf("</h1>\r\n");
 352
 353         if (WCC->ImportantMsg != NULL) {
 354                 message = ChrPtr(WCC->ImportantMsg);
 355         }
 356
 357         wc_printf(
 358                 _("The resource you requested requires a valid username and password. "
 359                 "You could not be logged in: %s\n"),
 360                 message
 361         );
 362         wDumpContent(0);
 363 }
 364
 365
 366 /*
 367  * Convenience functions to wrap around asynchronous ajax responses
 368  */
 369 void begin_ajax_response(void) {
 370         wcsession *WCC = WC;
 371
 372         FlushStrBuf(WCC->HBuf);
 373         output_headers(0, 0, 0, 0, 0, 0);
 374
 375         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 376                 "Server: %s\r\n"
 377                 "Connection: close\r\n"
 378                 ,
 379                 PACKAGE_STRING);
 380         begin_burst();
 381 }
 382
 383
 384 /*
 385  * print ajax response footer
 386  */
 387 void end_ajax_response(void) {
 388         wDumpContent(0);
 389 }
 390
 391
 392 /*
 393  * Wraps a Citadel server command in an AJAX transaction.
 394  */
 395 void ajax_servcmd(void)
 396 {
 397         wcsession *WCC = WC;
 398         int Done = 0;
 399         StrBuf *Buf;
 400         char *junk;
 401         size_t len;
 402
 403         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 404         begin_ajax_response();
 405         Buf = NewStrBuf();
 406         serv_puts(bstr("g_cmd"));
 407         StrBuf_ServGetln(Buf);
 408         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 409         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 410
 411         switch (GetServerStatus(Buf, NULL)) {
 412         case 8:
 413                 serv_puts("\n\n000");
 414                 if ( (StrLength(Buf)==3) &&
 415                      !strcmp(ChrPtr(Buf), "000")) {
 416                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 417                         break;
 418                 }
 419         case 1:
 420                 while (!Done) {
 421                         if (StrBuf_ServGetln(Buf) < 0)
 422                                 break;
 423                         if ( (StrLength(Buf)==3) &&
 424                              !strcmp(ChrPtr(Buf), "000")) {
 425                                 Done = 1;
 426                         }
 427                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 428                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 429                 }
 430                 break;
 431         case 4:
 432                 text_to_server(bstr("g_input"));
 433                 serv_puts("000");
 434                 break;
 435         case 6:
 436                 len = atol(&ChrPtr(Buf)[4]);
 437                 StrBuf_ServGetBLOBBuffered(Buf, len);
 438                 break;
 439         case 7:
 440                 len = atol(&ChrPtr(Buf)[4]);
 441                 junk = malloc(len);
 442                 memset(junk, 0, len);
 443                 serv_write(junk, len);
 444                 free(junk);
 445         }
 446
 447         end_ajax_response();
 448
 449         /*
 450          * This is kind of an ugly hack, but this is the only place it can go.
 451          * If the command was GEXP, then the instant messenger window must be
 452          * running, so reset the "last_pager_check" watchdog timer so
 453          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 454          */
 455         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 456                 WCC->last_pager_check = time(NULL);
 457         }
 458         FreeStrBuf(&Buf);
 459 }
 460
 461
 462 /*
 463  * Helper function for the asynchronous check to see if we need
 464  * to open the instant messenger window.
 465  */
 466 void seconds_since_last_gexp(void)
 467 {
 468         char buf[256];
 469
 470         if ( (time(NULL) - WC->last_pager_check) < 30) {
 471                 wc_printf("NO\n");
 472         }
 473         else {
 474                 memset(buf, 0, 5);
 475                 serv_puts("NOOP");
 476                 serv_getln(buf, sizeof buf);
 477                 if (buf[3] == '*') {
 478                         wc_printf("YES");
 479                 }
 480                 else {
 481                         wc_printf("NO");
 482                 }
 483         }
 484 }
 485
 486
 487 /*
 488  * Save a URL destination so we can go to it later
 489  */
 490 void push_destination(void) {
 491         wcsession *WCC = WC;
 492
 493         if (!WCC) {
 494                 wc_printf("no session");
 495                 return;
 496         }
 497
 498         FreeStrBuf(&WCC->PushedDestination);
 499         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 500         syslog(LOG_DEBUG, "Push: %s", ChrPtr(WCC->PushedDestination));
 501         wc_printf("OK");
 502 }
 503
 504
 505 /*
 506  * Go to the URL saved by push_destination()
 507  */
 508 void pop_destination(void) {
 509         wcsession *WCC = WC;
 510
 511         /*
 512          * If we are in the middle of a new user signup, the server may request that
 513          * we first pass through a registration screen.
 514          */
 515         if ((WCC) && (WCC->need_regi)) {
 516                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 517                         /* Registering will take us to the My Citadel Config room, so save our place */
 518                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 519                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 520                 }
 521                 WCC->need_regi = 0;
 522                 display_reg(1);
 523                 return;
 524         }
 525
 526         /*
 527          * Do something reasonable if we somehow ended up requesting a pop without
 528          * having first done a push.
 529          */
 530         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 531                 do_welcome();
 532                 return;
 533         }
 534
 535         /*
 536          * All righty then!  We have a destination saved, so go there now.
 537          */
 538         syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WCC->PushedDestination));
 539         http_redirect(ChrPtr(WCC->PushedDestination));
 540 }
 541
 542
 543
 544 int ReadPostData(void)
 545 {
 546         int rc;
 547         int urlencoded_post = 0;
 548         wcsession *WCC = WC;
 549         StrBuf *content = NULL;
 550
 551         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 552
 553         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 554
 555         if (!urlencoded_post)
 556         {
 557                 StrBufPrintf(content,
 558                      "Content-type: %s\n"
 559                              "Content-length: %ld\n\n",
 560                              ChrPtr(WCC->Hdr->HR.ContentType),
 561                              WCC->Hdr->HR.ContentLength);
 562         }
 563
 564         /** Read the entire input data at once. */
 565         rc = client_read_to(WCC->Hdr, content,
 566                             WCC->Hdr->HR.ContentLength,
 567                             SLEEPING);
 568         if (rc < 0)
 569                 return rc;
 570
 571
 572         if (urlencoded_post) {
 573                 ParseURLParams(content);
 574         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 575                 char *Buf;
 576                 char *BufEnd;
 577                 long len;
 578
 579                 len = StrLength(content);
 580                 Buf = SmashStrBuf(&content);
 581                 BufEnd = Buf + len;
 582                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 583                 free(Buf);
 584         } else if (WCC->Hdr->HR.ContentLength > 0) {
 585                 WCC->upload = content;
 586                 WCC->upload_length = StrLength(WCC->upload);
 587                 content = NULL;
 588         }
 589         FreeStrBuf(&content);
 590         return 1;
 591 }
 592
 593
 594 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 595 {
 596         long Depth, IsDepth;
 597         long offset = 0;
 598         wcsession *WCC = WC;
 599
 600         if (WCC->Hdr->HR.Handler != NULL)
 601                 offset ++;
 602         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 603         IsDepth = GetCount(WCC->Directory) + offset;
 604
 605 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 606         if (Depth < 0) {
 607                 Depth = -Depth;
 608                 return IsDepth > Depth;
 609         }
 610         else
 611                 return Depth == IsDepth;
 612 }
 613
 614
 615
 616 /*
 617  * Entry point for WebCit transaction
 618  */
 619 void session_loop(void)
 620 {
 621         int xhttp;
 622         StrBuf *Buf;
 623
 624         /*
 625          * We stuff these with the values coming from the client cookies,
 626          * so we can use them to reconnect a timed out session if we have to.
 627          */
 628         wcsession *WCC;
 629
 630         WCC= WC;
 631         WCC->upload_length = 0;
 632         WCC->upload = NULL;
 633         WCC->Hdr->nWildfireHeaders = 0;
 634
 635         if (WCC->Hdr->HR.ContentLength > 0) {
 636                 if (ReadPostData() < 0) {
 637                         return;
 638                 }
 639         }
 640
 641         Buf = NewStrBuf();
 642         WCC->trailing_javascript = NewStrBuf();
 643
 644         /* Convert base64-encoded URL's back to plain text */
 645         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 646                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 647                 StrBufDecodeBase64(WCC->Hdr->this_page);
 648                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 649                 goto SKIP_ALL_THIS_CRAP;
 650         }
 651
 652         /* If there are variables in the URL, we must grab them now */
 653         if (WCC->Hdr->PlainArgs != NULL)
 654                 ParseURLParams(WCC->Hdr->PlainArgs);
 655
 656         /* If the client sent a nonce that is incorrect, kill the request. */
 657         if (havebstr("nonce")) {
 658                 syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d",
 659                         bstr("nonce"), WCC->nonce
 660                 );
 661                 if (ibstr("nonce") != WCC->nonce) {
 662                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 663                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 664                         hprintf("Content-Type: text/plain\r\n");
 665                         begin_burst();
 666                         wc_printf("Security check failed.\r\n");
 667                         end_burst();
 668                         goto SKIP_ALL_THIS_CRAP;
 669                 }
 670         }
 671
 672         /*
 673          * If we're not connected to a Citadel server, try to hook up the connection now.
 674          */
 675         if (!WCC->connected) {
 676                 if (GetConnected()) {
 677                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 678                         hprintf("Content-Type: text/html\r\n");
 679                         begin_burst();
 680                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 681                         wc_printf(_("This program was unable to connect or stay "
 682                                 "connected to the Citadel server.  Please report "
 683                                 "this problem to your system administrator.")
 684                         );
 685                         wc_printf("<br>");
 686                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 687                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 688                                 _("Read More...")
 689                         );
 690                         wc_printf("</body></html>\n");
 691                         end_burst();
 692                         goto SKIP_ALL_THIS_CRAP;
 693                 }
 694         }
 695
 696         /*
 697          * If we're not logged in, but we have authentication data (either from
 698          * a cookie or from http-auth), try logging in to Citadel using that.
 699          */
 700         if (    (!WCC->logged_in)
 701                 && (StrLength(WCC->Hdr->c_username) > 0)
 702                 && (StrLength(WCC->Hdr->c_password) > 0)
 703         ) {
 704                 long Status;
 705
 706                 FlushStrBuf(Buf);
 707                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 708                 StrBuf_ServGetln(Buf);
 709                 if (GetServerStatus(Buf, &Status) == 3) {
 710                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 711                         StrBuf_ServGetln(Buf);
 712                         if (GetServerStatus(Buf, NULL) == 2) {
 713                                 become_logged_in(WCC->Hdr->c_username,
 714                                                  WCC->Hdr->c_password, Buf);
 715                         } else {
 716                                 /* Should only display when password is wrong */
 717                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 718                                 authorization_required();
 719                                 FreeStrBuf(&Buf);
 720                                 goto SKIP_ALL_THIS_CRAP;
 721                         }
 722                 }
 723                 else if (Status == 541) {
 724                         WCC->logged_in = 1;
 725                 }
 726         }
 727
 728         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 729                 (WCC->Hdr->HR.eReqType != ePOST) &&
 730                 (WCC->Hdr->HR.eReqType != eHEAD);
 731
 732         /*
 733          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 734          * prior to doing anything else.
 735          */
 736         if (havebstr("go")) {
 737                 int ret;
 738                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 739                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 740                 if ((ret/100) != 2) {
 741                         syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 742                 }
 743         }
 744         else if (havebstr("gotofirst")) {
 745                 int ret;
 746                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 747                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 748                 if ((ret/100) != 2) {
 749                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 750                 }
 751         }
 752
 753         /*
 754          * If we aren't in any room yet, but we have cookie data telling us where we're
 755          * supposed to be, and 'go' was not specified, then go there.
 756          */
 757         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 758                 int ret;
 759
 760                 syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 761                         ChrPtr(WCC->CurRoom.name),
 762                         ChrPtr(WCC->Hdr->c_roomname)
 763                 );
 764                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 765                 if ((ret/100) != 2) {
 766                         syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 767                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 768                 }
 769         }
 770
 771         if (WCC->Hdr->HR.Handler != NULL) {
 772                 if (    (!WCC->logged_in)
 773                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 774                         && (WCC->serv_info != NULL)
 775                         && (WCC->serv_info->serv_supports_guest == 0)
 776                 ) {
 777                         display_login();
 778                 }
 779                 else {
 780                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 781                                 begin_ajax_response();
 782                         }
 783                         WCC->Hdr->HR.Handler->F();
 784                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 785                                 end_ajax_response();
 786                         }
 787                 }
 788         }
 789         /* When all else fails, display the default landing page or a main menu. */
 790         else {
 791                 /*
 792                  * ordinary browser users get a nice login screen, DAV etc. requsets
 793                  * are given a 401 so they can handle it appropriate.
 794                  */
 795                 if (!WCC->logged_in)  {
 796                         if (xhttp) {
 797                                 authorization_required();
 798                         }
 799                         else {
 800                                 display_default_landing_page();
 801                         }
 802                 }
 803                 /*
 804                  * Toplevel dav requests? or just a flat browser request?
 805                  */
 806                 else {
 807                         if (xhttp) {
 808                                 dav_main();
 809                         }
 810                         else {
 811                                 display_main_menu();
 812                         }
 813                 }
 814         }
 815
 816 SKIP_ALL_THIS_CRAP:
 817         FreeStrBuf(&Buf);
 818         fflush(stdout);
 819 }
 820
 821
 822
 823 /*
 824  * Display the appropriate landing page for this site.
 825  */
 826 void display_default_landing_page(void) {
 827         wcsession *WCC = WC;
 828
 829         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 830                 /* default action */
 831
 832                 if (havebstr("go")) {
 833                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 834                         smart_goto(sbstr("go"));
 835                 }
 836                 else if (default_landing_page) {
 837                         http_redirect(default_landing_page);
 838                 }
 839                 else {
 840                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 841                         smart_goto(teh_lobby);
 842                         FreeStrBuf(&teh_lobby);
 843                 }
 844         }
 845         else {
 846                 display_login();
 847         }
 848 }
 849
 850
 851 /*
 852  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 853  */
 854 void sleeeeeeeeeep(int seconds)
 855 {
 856         struct timeval tv;
 857
 858         tv.tv_sec = seconds;
 859         tv.tv_usec = 0;
 860         select(0, NULL, NULL, NULL, &tv);
 861 }
 862
 863 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 864 {
 865         return is_https != 0;
 866 }
 867
 868 void AppendImportantMessage(const char *pch, long len)
 869 {
 870         wcsession *WCC = WC;
 871
 872         if (StrLength(WCC->ImportantMsg) > 0) {
 873                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 874         }
 875
 876         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 877 }
 878
 879 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 880 {
 881         wcsession *WCC = WC;
 882         if (WCC != NULL)
 883                 return (StrLength(WCC->ImportantMsg) > 0);
 884         else
 885                 return 0;
 886 }
 887
 888 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 889 {
 890         wcsession *WCC = WC;
 891
 892         if (WCC != NULL) {
 893                 if (StrLength(WCC->ImportantMsg) > 0) {
 894                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 895                 }
 896         }
 897 }
 898
 899 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 900 {
 901         wcsession *WCC = WC;
 902
 903         if (WCC != NULL)
 904                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 905 }
 906
 907 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 908 {
 909         StrBufAppendBuf(Target,
 910                         csslocal, 0);
 911 }
 912
 913 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 914 {
 915         StrBufAppendBufPlain(Target,
 916                              HKEY(PACKAGE_STRING), 0);
 917 }
 918
 919 extern char static_local_dir[PATH_MAX];
 920
 921
 922 void
 923 InitModule_WEBCIT
 924 (void)
 925 {
 926         char dir[SIZ];
 927         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 928         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 929         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 930         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 931         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 932         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 933         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 934         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 935
 936         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 937         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 938         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 939         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 940
 941         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 942         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 943         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 944         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 945         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 946
 947
 948         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 949         if (!access(dir, R_OK)) {
 950                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 951                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 952         }
 953         else
 954                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 955
 956 }
 957
 958 void
 959 ServerStartModule_WEBCIT
 960 (void)
 961 {
 962         HandlerHash = NewHash(1, NULL);
 963 }
 964
 965
 966 void
 967 ServerShutdownModule_WEBCIT
 968 (void)
 969 {
 970         FreeStrBuf(&csslocal);
 971         DeleteHash(&HandlerHash);
 972 }
 973
 974
 975
 976 void
 977 SessionNewModule_WEBCIT
 978 (wcsession *sess)
 979 {
 980         sess->ImportantMsg = NewStrBuf();
 981         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 982         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 983 }
 984
 985 void
 986 SessionDetachModule_WEBCIT
 987 (wcsession *sess)
 988 {
 989         DeleteHash(&sess->Directory);
 990
 991         FreeStrBuf(&sess->upload);
 992         sess->upload_length = 0;
 993
 994         FreeStrBuf(&sess->trailing_javascript);
 995
 996         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
 997         {
 998                 FreeStrBuf(&sess->WBuf);
 999                 sess->WBuf = NewStrBuf();
1000         }
1001         else
1002                 FlushStrBuf(sess->WBuf);
1003         FlushStrBuf(sess->HBuf);
1004         if (StrLength(sess->ImportantMsg) > 0) {
1005                 FlushStrBuf(sess->ImportantMsg);
1006         }
1007
1008 }
1009
1010 void
1011 SessionDestroyModule_WEBCIT
1012 (wcsession *sess)
1013 {
1014         FreeStrBuf(&sess->WBuf);
1015         FreeStrBuf(&sess->HBuf);
1016         FreeStrBuf(&sess->ImportantMsg);
1017         FreeStrBuf(&sess->PushedDestination);
1018 }
1019