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) 1996-2018 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         int n;
  29
  30         n = GetCount(WC->Hdr->HTTPHeaders);
  31         Put(WC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  32 }
  33
  34 void DeleteWebcitHandler(void *vHandler)
  35 {
  36         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  37         FreeStrBuf(&Handler->Name);
  38         FreeStrBuf(&Handler->DisplayName);
  39         free (Handler);
  40 }
  41
  42 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  43                          const char *DisplayName, long dslen,
  44                          WebcitHandlerFunc F,
  45                          long Flags)
  46 {
  47         WebcitHandler *NewHandler;
  48         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  49         NewHandler->F = F;
  50         NewHandler->Flags = Flags;
  51         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  52         StrBufShrinkToFit(NewHandler->Name, 1);
  53         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  54         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  55         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  56 }
  57
  58 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  59 {
  60         if (WC->Hdr->HR.Handler != NULL)
  61                 StrBufAppendTemplate(Target, TP, WC->Hdr->HR.Handler->DisplayName, 0);
  62 }
  63
  64
  65 /*
  66  * web-printing funcion. uses our vsnprintf wrapper
  67  */
  68 #ifdef UBER_VERBOSE_DEBUGGING
  69 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  70 #else
  71 void wc_printf(const char *format,...)
  72 #endif
  73 {
  74         va_list arg_ptr;
  75
  76         if (WC->WBuf == NULL)
  77                 WC->WBuf = NewStrBuf();
  78 #ifdef UBER_VERBOSE_DEBUGGING
  79         StrBufAppendPrintf(WC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  80 #endif
  81
  82         va_start(arg_ptr, format);
  83         StrBufVAppendPrintf(WC->WBuf, format, arg_ptr);
  84         va_end(arg_ptr);
  85 #ifdef UBER_VERBOSE_DEBUGGING
  86         StrBufAppendPrintf(WC->WBuf, "]\n");
  87 #endif
  88 }
  89
  90 /*
  91  * http-header-printing funcion. uses our vsnprintf wrapper
  92  */
  93 void hprintf(const char *format,...)
  94 {
  95         va_list arg_ptr;
  96
  97         va_start(arg_ptr, format);
  98         StrBufVAppendPrintf(WC->HBuf, format, arg_ptr);
  99         va_end(arg_ptr);
 100 }
 101
 102
 103
 104 /*
 105  * wrap up an HTTP session, closes tags, etc.
 106  *
 107  * print_standard_html_footer should be set to:
 108  * 0            - to transmit only,
 109  * nonzero      - to append the closing tags
 110  */
 111 void wDumpContent(int print_standard_html_footer)
 112 {
 113         if (print_standard_html_footer) {
 114                 wc_printf("</div> <!-- end of 'content' div -->\n");
 115                 do_template("trailing");
 116         }
 117
 118         /* If we've been saving it all up for one big output burst,
 119          * go ahead and do that now.
 120          */
 121         end_burst();
 122 }
 123
 124
 125
 126
 127 /*
 128  * Output HTTP headers and leading HTML for a page
 129  */
 130 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 131                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 132                         int do_room_banner,     /* 1 = include the room banner and <div id="content"></div> */
 133                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 134                         int suppress_check,     /* 1 = suppress check for instant messages        */
 135                         int cache               /* 1 = allow browser to cache this page      */
 136 ) {
 137         char httpnow[128];
 138
 139         if (WC->isFailure)
 140                 hprintf("HTTP/2.2 500 Internal Server Error");
 141         else if (WC->Hdr->HaveRange > 1)
 142                 hprintf("HTTP/1.1 206 Partial Content\r\n");
 143         else
 144                 hprintf("HTTP/1.1 200 OK\r\n");
 145
 146         http_datestring(httpnow, sizeof httpnow, time(NULL));
 147
 148         if (do_httpheaders) {
 149                 if (WC->serv_info != NULL)
 150                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 151                                 "Server: %s / %s\n"
 152                                 "Connection: close\r\n",
 153                                 PACKAGE_STRING,
 154                                 ChrPtr(WC->serv_info->serv_software));
 155                 else
 156                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 157                                 "Server: %s / [n/a]\n"
 158                                 "Connection: close\r\n",
 159                                 PACKAGE_STRING);
 160         }
 161
 162         if (cache > 0) {
 163                 char httpTomorow[128];
 164
 165                 http_datestring(httpTomorow, sizeof httpTomorow,
 166                                 time(NULL) + 60 * 60 * 24 * 2);
 167
 168                 hprintf("Pragma: public\r\n"
 169                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 170                         "Last-modified: %s\r\n"
 171                         "Expires: %s\r\n",
 172                         httpnow,
 173                         httpTomorow
 174                 );
 175         }
 176         else {
 177                 hprintf("Pragma: no-cache\r\n"
 178                         "Cache-Control: no-store\r\n"
 179                         "Expires: -1\r\n"
 180                 );
 181         }
 182
 183         if (cache < 2) stuff_to_cookie(unset_cookies);
 184
 185         if (do_htmlhead) {
 186                 begin_burst();
 187                 do_template("head");
 188                 if ( (WC->logged_in) && (!unset_cookies) ) {
 189                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 190                 }
 191                 if (do_room_banner) {
 192                         tmplput_roombanner(NULL, NULL);
 193                 }
 194         }
 195
 196         if (do_room_banner) {
 197                 wc_printf("<div id=\"content\">\n");
 198         }
 199 }
 200
 201 void output_custom_content_header(const char *ctype) {
 202         hprintf("HTTP/1.1 200 OK\r\n");
 203         hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 204         hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 205         hprintf("Connection: close\r\n");
 206 }
 207
 208
 209 /*
 210  * Generic function to do an HTTP redirect.  Easy and fun.
 211  */
 212 void http_redirect(const char *whichpage) {
 213         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 214         hprintf("Location: %s\r\n", whichpage);
 215         hprintf("URI: %s\r\n", whichpage);
 216         hprintf("Content-type: text/html; charset=utf-8\r\n");
 217         stuff_to_cookie(0);
 218         begin_burst();
 219         wc_printf("<html><body>");
 220         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 221         wc_printf("</body></html>\n");
 222         end_burst();
 223 }
 224
 225
 226
 227 /*
 228  * Output a piece of content to the web browser using conformant HTTP and MIME semantics.
 229  *
 230  * If this function is called, it is expected that begin_burst() has already been called
 231  * and some sort of content has been fed into the buffer.  This function will transmit a
 232  * bunch of headers to the client.  end_burst() will add some headers of its own, and then
 233  * transmit the buffered content to the client.
 234  */
 235 void http_transmit_thing(const char *content_type, int is_static)
 236 {
 237         if (verbose)
 238                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 239         output_headers(0, 0, 0, 0, 0, is_static);
 240
 241         hprintf("Content-type: %s\r\n"
 242                 "Server: %s\r\n"
 243                 "Connection: close\r\n",
 244                 content_type,
 245                 PACKAGE_STRING);
 246
 247         end_burst();
 248 }
 249
 250 void http_transmit_headers(const char *content_type, int is_static, long is_chunked, int is_gzip)
 251 {
 252         if (verbose)
 253                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 254         output_headers(0, 0, 0, 0, 0, is_static);
 255
 256         if (is_gzip)
 257                 hprintf("Content-encoding: gzip\r\n");
 258
 259         if (WC->Hdr->HaveRange)
 260                 hprintf("Accept-Ranges: bytes\r\n"
 261                         "Content-Range: bytes %ld-%ld/%ld\r\n",
 262                         WC->Hdr->RangeStart,
 263                         WC->Hdr->RangeTil,
 264                         WC->Hdr->TotalBytes);
 265
 266         hprintf("Content-type: %s\r\n"
 267                 "Server: "PACKAGE_STRING"\r\n"
 268                 "%s"
 269                 "Connection: close\r\n\r\n",
 270                 content_type,
 271                 (is_chunked)?"Transfer-Encoding: chunked\r\n":"");
 272 }
 273
 274
 275 /*
 276  * Convenience functions to display a page containing only a string
 277  *
 278  * titlebarcolor        color of the titlebar of the frame
 279  * titlebarmsg          text to display in the title bar
 280  * messagetext          body of the box
 281  */
 282 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 283 {
 284         hprintf("HTTP/1.1 200 OK\n");
 285         output_headers(1, 1, 1, 0, 0, 0);
 286         wc_printf("<div id=\"room_banner_override\">\n");
 287         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 288         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 289         wc_printf("</td></tr></table>\n");
 290         wc_printf("</div>\n<div id=\"content\">\n");
 291         escputs(messagetext);
 292         wc_printf("<hr />\n");
 293         wDumpContent(1);
 294 }
 295
 296
 297 /*
 298  * Display a blank page.
 299  */
 300 void blank_page(void) {
 301         output_headers(1, 1, 0, 0, 0, 0);
 302         wDumpContent(2);
 303 }
 304
 305
 306 /*
 307  * A template has been requested
 308  */
 309 void url_do_template(void) {
 310         const StrBuf *MimeType;
 311         const StrBuf *Tmpl = sbstr("template");
 312         begin_burst();
 313         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 314         http_transmit_thing(ChrPtr(MimeType), 0);
 315 }
 316
 317
 318
 319 /*
 320  * convenience function to indicate success
 321  */
 322 void display_success(const char *successmessage)
 323 {
 324         convenience_page("007700", "OK", successmessage);
 325 }
 326
 327
 328 /*
 329  * Authorization required page (sends a 401, causing the browser to request login credentials)
 330  */
 331 void authorization_required(void)
 332 {
 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(WC->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 (WC->ImportantMsg != NULL) {
 354                 message = ChrPtr(WC->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
 371         FlushStrBuf(WC->HBuf);
 372         output_headers(0, 0, 0, 0, 0, 0);
 373
 374         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 375                 "Server: %s\r\n"
 376                 "Connection: close\r\n"
 377                 ,
 378                 PACKAGE_STRING);
 379         begin_burst();
 380 }
 381
 382
 383 /*
 384  * print ajax response footer
 385  */
 386 void end_ajax_response(void) {
 387         wDumpContent(0);
 388 }
 389
 390
 391 /*
 392  * Wraps a Citadel server command in an AJAX transaction.
 393  */
 394 void ajax_servcmd(void)
 395 {
 396         int Done = 0;
 397         StrBuf *Buf;
 398         char *junk;
 399         size_t len;
 400
 401         if (verbose)
 402                 syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 403         begin_ajax_response();
 404         Buf = NewStrBuf();
 405         serv_puts(bstr("g_cmd"));
 406         StrBuf_ServGetln(Buf);
 407         StrBufAppendBuf(WC->WBuf, Buf, 0);
 408         StrBufAppendBufPlain(WC->WBuf, HKEY("\n"), 0);
 409
 410         switch (GetServerStatus(Buf, NULL)) {
 411         case 8:
 412                 serv_puts("\n\n000");
 413                 if ( (StrLength(Buf)==3) &&
 414                      !strcmp(ChrPtr(Buf), "000")) {
 415                         StrBufAppendBufPlain(WC->WBuf, HKEY("\000"), 0);
 416                         break;
 417                 }
 418         case 1:
 419                 while (!Done) {
 420                         if (StrBuf_ServGetln(Buf) < 0)
 421                                 break;
 422                         if ( (StrLength(Buf)==3) &&
 423                              !strcmp(ChrPtr(Buf), "000")) {
 424                                 Done = 1;
 425                         }
 426                         StrBufAppendBuf(WC->WBuf, Buf, 0);
 427                         StrBufAppendBufPlain(WC->WBuf, HKEY("\n"), 0);
 428                 }
 429                 break;
 430         case 4:
 431                 text_to_server(bstr("g_input"));
 432                 serv_puts("000");
 433                 break;
 434         case 6:
 435                 len = atol(&ChrPtr(Buf)[4]);
 436                 StrBuf_ServGetBLOBBuffered(Buf, len);
 437                 break;
 438         case 7:
 439                 len = atol(&ChrPtr(Buf)[4]);
 440                 junk = malloc(len);
 441                 memset(junk, 0, len);
 442                 serv_write(junk, len);
 443                 free(junk);
 444         }
 445
 446         end_ajax_response();
 447
 448         /*
 449          * This is kind of an ugly hack, but this is the only place it can go.
 450          * If the command was GEXP, then the instant messenger window must be
 451          * running, so reset the "last_pager_check" watchdog timer so
 452          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 453          */
 454         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 455                 WC->last_pager_check = time(NULL);
 456         }
 457         FreeStrBuf(&Buf);
 458 }
 459
 460
 461 /*
 462  * Helper function for the asynchronous check to see if we need
 463  * to open the instant messenger window.
 464  */
 465 void seconds_since_last_gexp(void)
 466 {
 467         char buf[256];
 468
 469         if ( (time(NULL) - WC->last_pager_check) < 30) {
 470                 wc_printf("NO\n");
 471         }
 472         else {
 473                 memset(buf, 0, 5);
 474                 serv_puts("NOOP");
 475                 serv_getln(buf, sizeof buf);
 476                 if (buf[3] == '*') {
 477                         wc_printf("YES");
 478                 }
 479                 else {
 480                         wc_printf("NO");
 481                 }
 482         }
 483 }
 484
 485
 486 /*
 487  * Save a URL destination so we can go to it later
 488  */
 489 void push_destination(void) {
 490
 491         if (!WC) {
 492                 wc_printf("no session");
 493                 return;
 494         }
 495
 496         FreeStrBuf(&WC->PushedDestination);
 497         WC->PushedDestination = NewStrBufDup(sbstr("url"));
 498         if (verbose)
 499                 syslog(LOG_DEBUG, "Push: %s", ChrPtr(WC->PushedDestination));
 500         wc_printf("OK");
 501 }
 502
 503
 504 /*
 505  * Go to the URL saved by push_destination()
 506  */
 507 void pop_destination(void) {
 508         /*
 509          * If we are in the middle of a new user signup, the server may request that
 510          * we first pass through a registration screen.
 511          */
 512         if ((WC) && (WC->need_regi)) {
 513                 if ((WC->PushedDestination != NULL) && (StrLength(WC->PushedDestination) > 0)) {
 514                         /* Registering will take us to the My Citadel Config room, so save our place */
 515                         StrBufAppendBufPlain(WC->PushedDestination, HKEY("?go="), 0);
 516                         StrBufUrlescAppend(WC->PushedDestination, WC->CurRoom.name, NULL);
 517                 }
 518                 WC->need_regi = 0;
 519                 display_reg(1);
 520                 return;
 521         }
 522
 523         /*
 524          * Do something reasonable if we somehow ended up requesting a pop without
 525          * having first done a push.
 526          */
 527         if ( (!WC) || (WC->PushedDestination == NULL) || (StrLength(WC->PushedDestination) == 0) ) {
 528                 do_welcome();
 529                 return;
 530         }
 531
 532         /*
 533          * All righty then!  We have a destination saved, so go there now.
 534          */
 535         if (verbose) {
 536                 syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WC->PushedDestination));
 537         }
 538         http_redirect(ChrPtr(WC->PushedDestination));
 539 }
 540
 541
 542 int ReadPostData(void) {
 543         int rc;
 544         int urlencoded_post = 0;
 545         StrBuf *content = NULL;
 546
 547         urlencoded_post = (strncasecmp(ChrPtr(WC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 548
 549         content = NewStrBufPlain(NULL, WC->Hdr->HR.ContentLength + 256);
 550
 551         if (!urlencoded_post) {
 552                 StrBufPrintf(content,
 553                         "Content-type: %s\n"
 554                         "Content-length: %ld\n\n",
 555                         ChrPtr(WC->Hdr->HR.ContentType),
 556                         WC->Hdr->HR.ContentLength
 557                 );
 558         }
 559
 560         /* Read the entire input data at once. */
 561         rc = client_read_to(WC->Hdr, content, WC->Hdr->HR.ContentLength, SLEEPING);
 562         if (rc < 0) {
 563                 return rc;
 564         }
 565
 566         if (urlencoded_post) {
 567                 ParseURLParams(content);
 568         }
 569         else if (!strncasecmp(ChrPtr(WC->Hdr->HR.ContentType), "multipart", 9)) {
 570                 char *Buf;
 571                 char *BufEnd;
 572                 long len;
 573
 574                 len = StrLength(content);
 575                 Buf = SmashStrBuf(&content);
 576                 BufEnd = Buf + len;
 577                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 578                 free(Buf);
 579         }
 580         else if (WC->Hdr->HR.ContentLength > 0) {
 581                 WC->upload = content;
 582                 WC->upload_length = StrLength(WC->upload);
 583                 content = NULL;
 584         }
 585         FreeStrBuf(&content);
 586         return 1;
 587 }
 588
 589
 590 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 591 {
 592         long Depth, IsDepth;
 593         long offset = 0;
 594
 595         if (WC->Hdr->HR.Handler != NULL)
 596                 offset ++;
 597         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 598         IsDepth = GetCount(WC->Directory) + offset;
 599
 600 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 601         if (Depth < 0) {
 602                 Depth = -Depth;
 603                 return IsDepth > Depth;
 604         }
 605         else
 606                 return Depth == IsDepth;
 607 }
 608
 609
 610
 611 /*
 612  * Entry point for WebCit transaction
 613  */
 614 void session_loop(void)
 615 {
 616         int xhttp;
 617         StrBuf *Buf;
 618
 619         /*
 620          * We stuff these with the values coming from the client cookies,
 621          * so we can use them to reconnect a timed out session if we have to.
 622          */
 623         WC->upload_length = 0;
 624         WC->upload = NULL;
 625         WC->Hdr->nWildfireHeaders = 0;
 626
 627         if (WC->Hdr->HR.ContentLength > 0) {
 628                 if (ReadPostData() < 0) {
 629                         return;
 630                 }
 631         }
 632
 633         Buf = NewStrBuf();
 634         WC->trailing_javascript = NewStrBuf();
 635
 636         /* Convert base64-encoded URL's back to plain text */
 637         if (!strncmp(ChrPtr(WC->Hdr->this_page), "/B64", 4)) {
 638                 StrBufCutLeft(WC->Hdr->this_page, 4);
 639                 StrBufDecodeBase64(WC->Hdr->this_page);
 640                 http_redirect(ChrPtr(WC->Hdr->this_page));
 641                 goto SKIP_ALL_THIS_CRAP;
 642         }
 643
 644         /* If there are variables in the URL, we must grab them now */
 645         if (WC->Hdr->PlainArgs != NULL)
 646                 ParseURLParams(WC->Hdr->PlainArgs);
 647
 648         /* If the client sent a nonce that is incorrect, kill the request. */
 649         if (havebstr("nonce")) {
 650                 if (verbose)
 651                         syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d",
 652                                bstr("nonce"), WC->nonce
 653                                 );
 654                 if (ibstr("nonce") != WC->nonce) {
 655                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 656                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 657                         hprintf("Content-Type: text/plain\r\n");
 658                         begin_burst();
 659                         wc_printf("Security check failed.\r\n");
 660                         end_burst();
 661                         goto SKIP_ALL_THIS_CRAP;
 662                 }
 663         }
 664
 665         /*
 666          * If we're not connected to a Citadel server, try to hook up the connection now.
 667          */
 668         if (!WC->connected) {
 669                 if (GetConnected()) {
 670                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 671                         hprintf("Content-Type: text/html\r\n");
 672                         begin_burst();
 673                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 674                         wc_printf(_("This program was unable to connect or stay "
 675                                 "connected to the Citadel server.  Please report "
 676                                 "this problem to your system administrator.")
 677                         );
 678                         wc_printf("<br>");
 679                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 680                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 681                                 _("Read More...")
 682                         );
 683                         wc_printf("</body></html>\n");
 684                         end_burst();
 685                         goto SKIP_ALL_THIS_CRAP;
 686                 }
 687         }
 688
 689         /*
 690          * If we're not logged in, but we have authentication data (either from
 691          * a cookie or from http-auth), try logging in to Citadel using that.
 692          */
 693         if (    (!WC->logged_in)
 694                 && (StrLength(WC->Hdr->c_username) > 0)
 695                 && (StrLength(WC->Hdr->c_password) > 0)
 696         ) {
 697                 long Status;
 698
 699                 FlushStrBuf(Buf);
 700                 serv_printf("USER %s", ChrPtr(WC->Hdr->c_username));
 701                 StrBuf_ServGetln(Buf);
 702                 if (GetServerStatus(Buf, &Status) == 3) {
 703                         serv_printf("PASS %s", ChrPtr(WC->Hdr->c_password));
 704                         StrBuf_ServGetln(Buf);
 705                         if (GetServerStatus(Buf, NULL) == 2) {
 706                                 become_logged_in(WC->Hdr->c_username,
 707                                                  WC->Hdr->c_password, Buf);
 708                         } else {
 709                                 /* Should only display when password is wrong */
 710                                 WC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 711                                 authorization_required();
 712                                 FreeStrBuf(&Buf);
 713                                 goto SKIP_ALL_THIS_CRAP;
 714                         }
 715                 }
 716                 else if (Status == 541) {
 717                         WC->logged_in = 1;
 718                 }
 719         }
 720
 721         xhttp = (WC->Hdr->HR.eReqType != eGET) &&
 722                 (WC->Hdr->HR.eReqType != ePOST) &&
 723                 (WC->Hdr->HR.eReqType != eHEAD);
 724
 725         /*
 726          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 727          * prior to doing anything else.
 728          */
 729         if (havebstr("go")) {
 730                 int ret;
 731                 if (verbose)
 732                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 733                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 734                 if ((ret/100) != 2) {
 735                         if (verbose)
 736                                 syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 737                 }
 738         }
 739         else if (havebstr("gotofirst")) {
 740                 int ret;
 741                 if (verbose)
 742                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 743                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 744                 if ((ret/100) != 2) {
 745                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 746                 }
 747         }
 748
 749         /*
 750          * If we aren't in any room yet, but we have cookie data telling us where we're
 751          * supposed to be, and 'go' was not specified, then go there.
 752          */
 753         else if ( (StrLength(WC->CurRoom.name) == 0) && ( (StrLength(WC->Hdr->c_roomname) > 0) )) {
 754                 int ret;
 755
 756                 if (verbose)
 757                         syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 758                                ChrPtr(WC->CurRoom.name),
 759                                ChrPtr(WC->Hdr->c_roomname)
 760                 );
 761                 ret = gotoroom(WC->Hdr->c_roomname);    /* do quietly to avoid session output! */
 762                 if ((ret/100) != 2) {
 763                         if (verbose)
 764                                 syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 765                                        ChrPtr(WC->Hdr->c_roomname), ret);
 766                 }
 767         }
 768
 769         if (WC->Hdr->HR.Handler != NULL) {
 770                 if (    (!WC->logged_in)
 771                         && ((WC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 772                         && (WC->serv_info != NULL)
 773                         && (WC->serv_info->serv_supports_guest == 0)
 774                 ) {
 775                         display_login();
 776                 }
 777                 else {
 778                         if ((WC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 779                                 begin_ajax_response();
 780                         }
 781                         WC->Hdr->HR.Handler->F();
 782                         if ((WC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 783                                 end_ajax_response();
 784                         }
 785                 }
 786         }
 787         /* When all else fails, display the default landing page or a main menu. */
 788         else {
 789                 /*
 790                  * ordinary browser users get a nice login screen, DAV etc. requsets
 791                  * are given a 401 so they can handle it appropriate.
 792                  */
 793                 if (!WC->logged_in)  {
 794                         if (xhttp) {
 795                                 authorization_required();
 796                         }
 797                         else {
 798                                 display_default_landing_page();
 799                         }
 800                 }
 801                 /*
 802                  * Toplevel dav requests? or just a flat browser request?
 803                  */
 804                 else {
 805                         if (xhttp) {
 806                                 dav_main();
 807                         }
 808                         else {
 809                                 display_main_menu();
 810                         }
 811                 }
 812         }
 813
 814 SKIP_ALL_THIS_CRAP:
 815         FreeStrBuf(&Buf);
 816         fflush(stdout);
 817 }
 818
 819
 820
 821 /*
 822  * Display the appropriate landing page for this site.
 823  */
 824 void display_default_landing_page(void) {
 825         if (WC && WC->serv_info && WC->serv_info->serv_supports_guest) {
 826                 /* default action */
 827
 828                 if (havebstr("go")) {
 829                         if (verbose)
 830                                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 831                         smart_goto(sbstr("go"));
 832                 }
 833                 else if (default_landing_page) {
 834                         http_redirect(default_landing_page);
 835                 }
 836                 else {
 837                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 838                         smart_goto(teh_lobby);
 839                         FreeStrBuf(&teh_lobby);
 840                 }
 841         }
 842         else {
 843                 display_login();
 844         }
 845 }
 846
 847
 848 /*
 849  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 850  */
 851 void sleeeeeeeeeep(int seconds)
 852 {
 853         struct timeval tv;
 854
 855         tv.tv_sec = seconds;
 856         tv.tv_usec = 0;
 857         select(0, NULL, NULL, NULL, &tv);
 858 }
 859
 860 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 861 {
 862         return is_https != 0;
 863 }
 864
 865 void AppendImportantMessage(const char *pch, long len)
 866 {
 867
 868         if (StrLength(WC->ImportantMsg) > 0) {
 869                 StrBufAppendBufPlain(WC->ImportantMsg, HKEY("\n"), 0);
 870         }
 871
 872         StrBufAppendBufPlain(WC->ImportantMsg, pch, len, 0);
 873 }
 874
 875 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 876 {
 877         if (WC != NULL) {
 878                 return (StrLength(WC->ImportantMsg) > 0);
 879         }
 880         else {
 881                 return 0;
 882         }
 883 }
 884
 885 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 886 {
 887
 888         if (WC != NULL) {
 889                 if (StrLength(WC->ImportantMsg) > 0) {
 890                         StrBufAppendTemplate(Target, TP, WC->ImportantMsg, 0);
 891                 }
 892         }
 893 }
 894
 895 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 896 {
 897
 898         if (WC != NULL) {
 899                 StrBufAppendTemplate(Target, TP, WC->trailing_javascript, 0);
 900         }
 901 }
 902
 903 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 904 {
 905         StrBufAppendBuf(Target,
 906                         csslocal, 0);
 907 }
 908
 909 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP) {
 910         StrBufAppendBufPlain(Target, HKEY(PACKAGE_STRING), 0);
 911 }
 912
 913 extern char static_local_dir[PATH_MAX];
 914
 915
 916 void
 917 InitModule_WEBCIT
 918 (void)
 919 {
 920         char dir[SIZ];
 921         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 922         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 923         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 924         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 925         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 926         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 927         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 928         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 929
 930         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 931         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 932         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 933         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 934
 935         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 936         RegisterNamespace("IMPORTANTMESSAGE", 0, 1, tmplput_importantmessage, NULL, CTX_NONE);
 937         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 938         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 939         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 940
 941
 942         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 943         if (!access(dir, R_OK)) {
 944                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 945                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 946         }
 947         else
 948                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 949
 950 }
 951
 952 void
 953 ServerStartModule_WEBCIT
 954 (void)
 955 {
 956         HandlerHash = NewHash(1, NULL);
 957 }
 958
 959
 960 void
 961 ServerShutdownModule_WEBCIT
 962 (void)
 963 {
 964         FreeStrBuf(&csslocal);
 965         DeleteHash(&HandlerHash);
 966 }
 967
 968
 969
 970 void
 971 SessionNewModule_WEBCIT
 972 (wcsession *sess)
 973 {
 974         sess->ImportantMsg = NewStrBuf();
 975         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 976         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 977 }
 978
 979 void
 980 SessionDetachModule_WEBCIT
 981 (wcsession *sess)
 982 {
 983         DeleteHash(&sess->Directory);
 984
 985         FreeStrBuf(&sess->upload);
 986         sess->upload_length = 0;
 987
 988         FreeStrBuf(&sess->trailing_javascript);
 989
 990         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
 991         {
 992                 FreeStrBuf(&sess->WBuf);
 993                 sess->WBuf = NewStrBuf();
 994         }
 995         else
 996                 FlushStrBuf(sess->WBuf);
 997         FlushStrBuf(sess->HBuf);
 998         if (StrLength(sess->ImportantMsg) > 0) {
 999                 FlushStrBuf(sess->ImportantMsg);
1000         }
1001
1002 }
1003
1004 void
1005 SessionDestroyModule_WEBCIT
1006 (wcsession *sess)
1007 {
1008         FreeStrBuf(&sess->WBuf);
1009         FreeStrBuf(&sess->HBuf);
1010         FreeStrBuf(&sess->ImportantMsg);
1011         FreeStrBuf(&sess->PushedDestination);
1012 }
1013