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) 1996-2012 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
 137                         int do_room_banner,     /* 0=no, 1=yes,
 138                                                  * 2 = I'm going to embed my own, so don't open the
 139                                                  *     <div id="content"> either.
 140                                                  */
 141
 142                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 143                         int suppress_check,     /* 1 = suppress check for instant messages        */
 144                         int cache               /* 1 = allow browser to cache this page      */
 145 ) {
 146         wcsession *WCC = WC;
 147         char httpnow[128];
 148
 149         hprintf("HTTP/1.1 200 OK\n");
 150         http_datestring(httpnow, sizeof httpnow, time(NULL));
 151
 152         if (do_httpheaders) {
 153                 if (WCC->serv_info != NULL)
 154                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 155                                 "Server: %s / %s\n"
 156                                 "Connection: close\r\n",
 157                                 PACKAGE_STRING,
 158                                 ChrPtr(WCC->serv_info->serv_software));
 159                 else
 160                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 161                                 "Server: %s / [n/a]\n"
 162                                 "Connection: close\r\n",
 163                                 PACKAGE_STRING);
 164         }
 165
 166         if (cache > 0) {
 167                 char httpTomorow[128];
 168
 169                 http_datestring(httpTomorow, sizeof httpTomorow,
 170                                 time(NULL) + 60 * 60 * 24 * 2);
 171
 172                 hprintf("Pragma: public\r\n"
 173                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 174                         "Last-modified: %s\r\n"
 175                         "Expires: %s\r\n",
 176                         httpnow,
 177                         httpTomorow
 178                 );
 179         }
 180         else {
 181                 hprintf("Pragma: no-cache\r\n"
 182                         "Cache-Control: no-store\r\n"
 183                         "Expires: -1\r\n"
 184                 );
 185         }
 186
 187         if (cache < 2) stuff_to_cookie(unset_cookies);
 188
 189         if (do_htmlhead) {
 190                 begin_burst();
 191                 do_template("head");
 192                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 193                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 194                 }
 195                 if (do_room_banner == 1) {
 196                         tmplput_roombanner(NULL, NULL);
 197                 }
 198         }
 199
 200         if (do_room_banner == 1) {
 201                 wc_printf("<div id=\"content\">\n");
 202         }
 203 }
 204
 205 void output_custom_content_header(const char *ctype) {
 206         hprintf("HTTP/1.1 200 OK\r\n");
 207         hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 208         hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 209         hprintf("Connection: close\r\n");
 210 }
 211
 212
 213 /*
 214  * Generic function to do an HTTP redirect.  Easy and fun.
 215  */
 216 void http_redirect(const char *whichpage) {
 217         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 218         hprintf("Location: %s\r\n", whichpage);
 219         hprintf("URI: %s\r\n", whichpage);
 220         hprintf("Content-type: text/html; charset=utf-8\r\n");
 221         stuff_to_cookie(0);
 222         begin_burst();
 223         wc_printf("<html><body>");
 224         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 225         wc_printf("</body></html>\n");
 226         end_burst();
 227 }
 228
 229
 230
 231 /*
 232  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 233  */
 234 void http_transmit_thing(const char *content_type, int is_static)
 235 {
 236
 237         syslog(9, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 238         output_headers(0, 0, 0, 0, 0, is_static);
 239
 240         hprintf("Content-type: %s\r\n"
 241                 "Server: %s\r\n"
 242                 "Connection: close\r\n",
 243                 content_type,
 244                 PACKAGE_STRING);
 245
 246         end_burst();
 247 }
 248
 249
 250 /*
 251  * Convenience functions to display a page containing only a string
 252  *
 253  * titlebarcolor        color of the titlebar of the frame
 254  * titlebarmsg          text to display in the title bar
 255  * messagetext          body of the box
 256  */
 257 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 258 {
 259         hprintf("HTTP/1.1 200 OK\n");
 260         output_headers(1, 1, 1, 0, 0, 0);
 261         wc_printf("<div id=\"room_banner_override\">\n");
 262         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 263         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 264         wc_printf("</td></tr></table>\n");
 265         wc_printf("</div>\n<div id=\"content\">\n");
 266         escputs(messagetext);
 267         wc_printf("<hr />\n");
 268         wDumpContent(1);
 269 }
 270
 271
 272 /*
 273  * Display a blank page.
 274  */
 275 void blank_page(void) {
 276         output_headers(1, 1, 0, 0, 0, 0);
 277         wDumpContent(2);
 278 }
 279
 280
 281 /*
 282  * A template has been requested
 283  */
 284 void url_do_template(void) {
 285         const StrBuf *MimeType;
 286         const StrBuf *Tmpl = sbstr("template");
 287         begin_burst();
 288         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 289         http_transmit_thing(ChrPtr(MimeType), 0);
 290 }
 291
 292
 293
 294 /*
 295  * convenience function to indicate success
 296  */
 297 void display_success(const char *successmessage)
 298 {
 299         convenience_page("007700", "OK", successmessage);
 300 }
 301
 302
 303 /*
 304  * Authorization required page (sends a 401, causing the browser to request login credentials)
 305  */
 306 void authorization_required(void)
 307 {
 308         wcsession *WCC = WC;
 309         const char *message = "";
 310
 311         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 312         hprintf(
 313                 "Server: %s / %s\r\n"
 314                 "Connection: close\r\n",
 315                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 316         );
 317         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 318         hprintf("Content-Type: text/html\r\n");
 319         begin_burst();
 320         wc_printf("<h1>");
 321         wc_printf(_("Authorization Required"));
 322         wc_printf("</h1>\r\n");
 323
 324         if (WCC->ImportantMsg != NULL) {
 325                 message = ChrPtr(WCC->ImportantMsg);
 326         }
 327
 328         wc_printf(
 329                 _("The resource you requested requires a valid username and password. "
 330                 "You could not be logged in: %s\n"),
 331                 message
 332         );
 333         wDumpContent(0);
 334 }
 335
 336
 337 /*
 338  * Convenience functions to wrap around asynchronous ajax responses
 339  */
 340 void begin_ajax_response(void) {
 341         wcsession *WCC = WC;
 342
 343         FlushStrBuf(WCC->HBuf);
 344         output_headers(0, 0, 0, 0, 0, 0);
 345
 346         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 347                 "Server: %s\r\n"
 348                 "Connection: close\r\n"
 349                 ,
 350                 PACKAGE_STRING);
 351         begin_burst();
 352 }
 353
 354
 355 /*
 356  * print ajax response footer
 357  */
 358 void end_ajax_response(void) {
 359         wDumpContent(0);
 360 }
 361
 362
 363 /*
 364  * Wraps a Citadel server command in an AJAX transaction.
 365  */
 366 void ajax_servcmd(void)
 367 {
 368         wcsession *WCC = WC;
 369         int Done = 0;
 370         StrBuf *Buf;
 371         char *junk;
 372         size_t len;
 373
 374         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 375         begin_ajax_response();
 376         Buf = NewStrBuf();
 377         serv_puts(bstr("g_cmd"));
 378         StrBuf_ServGetln(Buf);
 379         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 380         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 381
 382         switch (GetServerStatus(Buf, NULL)) {
 383         case 8:
 384                 serv_puts("\n\n000");
 385                 if ( (StrLength(Buf)==3) &&
 386                      !strcmp(ChrPtr(Buf), "000")) {
 387                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 388                         break;
 389                 }
 390         case 1:
 391                 while (!Done) {
 392                         if (StrBuf_ServGetln(Buf) < 0)
 393                                 break;
 394                         if ( (StrLength(Buf)==3) &&
 395                              !strcmp(ChrPtr(Buf), "000")) {
 396                                 Done = 1;
 397                         }
 398                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 399                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 400                 }
 401                 break;
 402         case 4:
 403                 text_to_server(bstr("g_input"));
 404                 serv_puts("000");
 405                 break;
 406         case 6:
 407                 len = atol(&ChrPtr(Buf)[4]);
 408                 StrBuf_ServGetBLOBBuffered(Buf, len);
 409                 break;
 410         case 7:
 411                 len = atol(&ChrPtr(Buf)[4]);
 412                 junk = malloc(len);
 413                 memset(junk, 0, len);
 414                 serv_write(junk, len);
 415                 free(junk);
 416         }
 417
 418         end_ajax_response();
 419
 420         /*
 421          * This is kind of an ugly hack, but this is the only place it can go.
 422          * If the command was GEXP, then the instant messenger window must be
 423          * running, so reset the "last_pager_check" watchdog timer so
 424          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 425          */
 426         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 427                 WCC->last_pager_check = time(NULL);
 428         }
 429         FreeStrBuf(&Buf);
 430 }
 431
 432
 433 /*
 434  * Helper function for the asynchronous check to see if we need
 435  * to open the instant messenger window.
 436  */
 437 void seconds_since_last_gexp(void)
 438 {
 439         char buf[256];
 440
 441         if ( (time(NULL) - WC->last_pager_check) < 30) {
 442                 wc_printf("NO\n");
 443         }
 444         else {
 445                 memset(buf, 0, 5);
 446                 serv_puts("NOOP");
 447                 serv_getln(buf, sizeof buf);
 448                 if (buf[3] == '*') {
 449                         wc_printf("YES");
 450                 }
 451                 else {
 452                         wc_printf("NO");
 453                 }
 454         }
 455 }
 456
 457
 458 /*
 459  * Save a URL destination so we can go to it later
 460  */
 461 void push_destination(void) {
 462         wcsession *WCC = WC;
 463
 464         if (!WCC) {
 465                 wc_printf("no session");
 466                 return;
 467         }
 468
 469         FreeStrBuf(&WCC->PushedDestination);
 470         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 471         syslog(9, "Push: %s", ChrPtr(WCC->PushedDestination));
 472         wc_printf("OK");
 473 }
 474
 475
 476 /*
 477  * Go to the URL saved by push_destination()
 478  */
 479 void pop_destination(void) {
 480         wcsession *WCC = WC;
 481
 482         /*
 483          * If we are in the middle of a new user signup, the server may request that
 484          * we first pass through a registration screen.
 485          */
 486         if ((WCC) && (WCC->need_regi)) {
 487                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 488                         /* Registering will take us to the My Citadel Config room, so save our place */
 489                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 490                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 491                 }
 492                 WCC->need_regi = 0;
 493                 display_reg(1);
 494                 return;
 495         }
 496
 497         /*
 498          * Do something reasonable if we somehow ended up requesting a pop without
 499          * having first done a push.
 500          */
 501         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 502                 do_welcome();
 503                 return;
 504         }
 505
 506         /*
 507          * All righty then!  We have a destination saved, so go there now.
 508          */
 509         syslog(9, "Pop: %s", ChrPtr(WCC->PushedDestination));
 510         http_redirect(ChrPtr(WCC->PushedDestination));
 511 }
 512
 513
 514
 515 int ReadPostData(void)
 516 {
 517         int rc;
 518         int urlencoded_post = 0;
 519         wcsession *WCC = WC;
 520         StrBuf *content = NULL;
 521
 522         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 523
 524         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 525
 526         if (!urlencoded_post)
 527         {
 528                 StrBufPrintf(content,
 529                      "Content-type: %s\n"
 530                              "Content-length: %ld\n\n",
 531                              ChrPtr(WCC->Hdr->HR.ContentType),
 532                              WCC->Hdr->HR.ContentLength);
 533         }
 534
 535         /** Read the entire input data at once. */
 536         rc = client_read_to(WCC->Hdr, content,
 537                             WCC->Hdr->HR.ContentLength,
 538                             SLEEPING);
 539         if (rc < 0)
 540                 return rc;
 541
 542
 543         if (urlencoded_post) {
 544                 ParseURLParams(content);
 545         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 546                 char *Buf;
 547                 char *BufEnd;
 548                 long len;
 549
 550                 len = StrLength(content);
 551                 Buf = SmashStrBuf(&content);
 552                 BufEnd = Buf + len;
 553                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 554                 free(Buf);
 555         } else if (WCC->Hdr->HR.ContentLength > 0) {
 556                 WCC->upload = content;
 557                 WCC->upload_length = StrLength(WCC->upload);
 558                 content = NULL;
 559         }
 560         FreeStrBuf(&content);
 561         return 1;
 562 }
 563
 564
 565 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 566 {
 567         long Depth, IsDepth;
 568         long offset = 0;
 569         wcsession *WCC = WC;
 570
 571         if (WCC->Hdr->HR.Handler != NULL)
 572                 offset ++;
 573         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 574         IsDepth = GetCount(WCC->Directory) + offset;
 575
 576 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 577         if (Depth < 0) {
 578                 Depth = -Depth;
 579                 return IsDepth > Depth;
 580         }
 581         else
 582                 return Depth == IsDepth;
 583 }
 584
 585
 586
 587 /*
 588  * Entry point for WebCit transaction
 589  */
 590 void session_loop(void)
 591 {
 592         int xhttp;
 593         StrBuf *Buf;
 594
 595         /*
 596          * We stuff these with the values coming from the client cookies,
 597          * so we can use them to reconnect a timed out session if we have to.
 598          */
 599         wcsession *WCC;
 600
 601         WCC= WC;
 602         WCC->upload_length = 0;
 603         WCC->upload = NULL;
 604         WCC->Hdr->nWildfireHeaders = 0;
 605
 606         if (WCC->Hdr->HR.ContentLength > 0) {
 607                 if (ReadPostData() < 0) {
 608                         return;
 609                 }
 610         }
 611
 612         Buf = NewStrBuf();
 613         WCC->trailing_javascript = NewStrBuf();
 614
 615         /* Convert base64-encoded URL's back to plain text */
 616         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 617                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 618                 StrBufDecodeBase64(WCC->Hdr->this_page);
 619                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 620                 goto SKIP_ALL_THIS_CRAP;
 621         }
 622
 623         /* If there are variables in the URL, we must grab them now */
 624         if (WCC->Hdr->PlainArgs != NULL)
 625                 ParseURLParams(WCC->Hdr->PlainArgs);
 626
 627         /* If the client sent a nonce that is incorrect, kill the request. */
 628         if (havebstr("nonce")) {
 629                 syslog(9, "Comparing supplied nonce %s to session nonce %d",
 630                         bstr("nonce"), WCC->nonce
 631                 );
 632                 if (ibstr("nonce") != WCC->nonce) {
 633                         syslog(9, "Ignoring request with mismatched nonce.");
 634                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 635                         hprintf("Content-Type: text/plain\r\n");
 636                         begin_burst();
 637                         wc_printf("Security check failed.\r\n");
 638                         end_burst();
 639                         goto SKIP_ALL_THIS_CRAP;
 640                 }
 641         }
 642
 643         /*
 644          * If we're not connected to a Citadel server, try to hook up the connection now.
 645          */
 646         if (!WCC->connected) {
 647                 if (GetConnected()) {
 648                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 649                         hprintf("Content-Type: text/html\r\n");
 650                         begin_burst();
 651                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 652                         wc_printf(_("This program was unable to connect or stay "
 653                                 "connected to the Citadel server.  Please report "
 654                                 "this problem to your system administrator.")
 655                         );
 656                         wc_printf("<br>");
 657                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 658                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 659                                 _("Read More...")
 660                         );
 661                         wc_printf("</body></html>\n");
 662                         end_burst();
 663                         goto SKIP_ALL_THIS_CRAP;
 664                 }
 665         }
 666
 667         /*
 668          * If we're not logged in, but we have authentication data (either from
 669          * a cookie or from http-auth), try logging in to Citadel using that.
 670          */
 671         if (    (!WCC->logged_in)
 672                 && (StrLength(WCC->Hdr->c_username) > 0)
 673                 && (StrLength(WCC->Hdr->c_password) > 0)
 674         ) {
 675                 long Status;
 676
 677                 FlushStrBuf(Buf);
 678                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 679                 StrBuf_ServGetln(Buf);
 680                 if (GetServerStatus(Buf, &Status) == 3) {
 681                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 682                         StrBuf_ServGetln(Buf);
 683                         if (GetServerStatus(Buf, NULL) == 2) {
 684                                 become_logged_in(WCC->Hdr->c_username,
 685                                                  WCC->Hdr->c_password, Buf);
 686                         } else {
 687                                 /* Should only display when password is wrong */
 688                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 689                                 authorization_required();
 690                                 FreeStrBuf(&Buf);
 691                                 goto SKIP_ALL_THIS_CRAP;
 692                         }
 693                 }
 694                 else if (Status == 541) {
 695                         WCC->logged_in = 1;
 696                 }
 697         }
 698
 699         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 700                 (WCC->Hdr->HR.eReqType != ePOST) &&
 701                 (WCC->Hdr->HR.eReqType != eHEAD);
 702
 703         /*
 704          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 705          * prior to doing anything else.
 706          */
 707         if (havebstr("go")) {
 708                 int ret;
 709                 syslog(9, "Explicit room selection: %s", bstr("go"));
 710                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 711                 if ((ret/100) != 2) {
 712                         syslog(1, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 713                 }
 714         }
 715         else if (havebstr("gotofirst")) {
 716                 int ret;
 717                 syslog(9, "Explicit room selection: %s", bstr("gotofirst"));
 718                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 719                 if ((ret/100) != 2) {
 720                         syslog(1, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 721                 }
 722         }
 723
 724         /*
 725          * If we aren't in any room yet, but we have cookie data telling us where we're
 726          * supposed to be, and 'go' was not specified, then go there.
 727          */
 728         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 729                 int ret;
 730
 731                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...",
 732                         ChrPtr(WCC->CurRoom.name),
 733                         ChrPtr(WCC->Hdr->c_roomname)
 734                 );
 735                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 736                 if ((ret/100) != 2) {
 737                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 738                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 739                 }
 740         }
 741
 742         if (WCC->Hdr->HR.Handler != NULL) {
 743                 if (    (!WCC->logged_in)
 744                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 745                         && (WCC->serv_info->serv_supports_guest == 0)
 746                 ) {
 747                         display_login();
 748                 }
 749                 else {
 750                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 751                                 begin_ajax_response();
 752                         }
 753                         WCC->Hdr->HR.Handler->F();
 754                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 755                                 end_ajax_response();
 756                         }
 757                 }
 758         }
 759         /* When all else fails, display the default landing page or a main menu. */
 760         else {
 761                 /*
 762                  * ordinary browser users get a nice login screen, DAV etc. requsets
 763                  * are given a 401 so they can handle it appropriate.
 764                  */
 765                 if (!WCC->logged_in)  {
 766                         if (xhttp) {
 767                                 authorization_required();
 768                         }
 769                         else {
 770                                 display_default_landing_page();
 771                         }
 772                 }
 773                 /*
 774                  * Toplevel dav requests? or just a flat browser request?
 775                  */
 776                 else {
 777                         if (xhttp) {
 778                                 dav_main();
 779                         }
 780                         else {
 781                                 display_main_menu();
 782                         }
 783                 }
 784         }
 785
 786 SKIP_ALL_THIS_CRAP:
 787         FreeStrBuf(&Buf);
 788         fflush(stdout);
 789 }
 790
 791
 792
 793 /*
 794  * Display the appropriate landing page for this site.
 795  */
 796 void display_default_landing_page(void) {
 797         wcsession *WCC = WC;
 798
 799         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 800                 /* default action */
 801
 802                 if (havebstr("go")) {
 803                         syslog(9, "Explicit room selection: %s", bstr("go"));
 804                         StrBuf *teh_room = NewStrBufPlain(bstr("go"), strlen(bstr("go")));
 805                         smart_goto(teh_room);
 806                         FreeStrBuf(&teh_room);
 807                 }
 808                 else if (default_landing_page) {
 809                         http_redirect(default_landing_page);
 810                 }
 811                 else {
 812                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 813                         smart_goto(teh_lobby);
 814                         FreeStrBuf(&teh_lobby);
 815                 }
 816         }
 817         else {
 818                 display_login();
 819         }
 820 }
 821
 822
 823 /*
 824  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 825  */
 826 void sleeeeeeeeeep(int seconds)
 827 {
 828         struct timeval tv;
 829
 830         tv.tv_sec = seconds;
 831         tv.tv_usec = 0;
 832         select(0, NULL, NULL, NULL, &tv);
 833 }
 834
 835 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 836 {
 837         return is_https != 0;
 838 }
 839
 840 void AppendImportantMessage(const char *pch, long len)
 841 {
 842         wcsession *WCC = WC;
 843
 844         if (StrLength(WCC->ImportantMsg) > 0) {
 845                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 846         }
 847
 848         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 849 }
 850
 851 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 852 {
 853         wcsession *WCC = WC;
 854         if (WCC != NULL)
 855                 return (StrLength(WCC->ImportantMsg) > 0);
 856         else
 857                 return 0;
 858 }
 859
 860 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 861 {
 862         wcsession *WCC = WC;
 863
 864         if (WCC != NULL) {
 865                 if (StrLength(WCC->ImportantMsg) > 0) {
 866                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 867                         FlushStrBuf(WCC->ImportantMsg);
 868                 }
 869         }
 870 }
 871
 872 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 873 {
 874         wcsession *WCC = WC;
 875
 876         if (WCC != NULL)
 877                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 878 }
 879
 880 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 881 {
 882         StrBufAppendBuf(Target,
 883                         csslocal, 0);
 884 }
 885
 886 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 887 {
 888         StrBufAppendBufPlain(Target,
 889                              HKEY(PACKAGE_STRING), 0);
 890 }
 891
 892 extern char static_local_dir[PATH_MAX];
 893
 894
 895 void
 896 InitModule_WEBCIT
 897 (void)
 898 {
 899         char dir[SIZ];
 900         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 901         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 902         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 903         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 904         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 905         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 906         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 907         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 908
 909         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 910         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 911         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 912         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 913
 914         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 915         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 916         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 917         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 918         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 919
 920
 921         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 922         if (!access(dir, R_OK)) {
 923                 syslog(9, "Using local Stylesheet [%s]", dir);
 924                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 925         }
 926         else
 927                 syslog(9, "No Site-local Stylesheet [%s] installed.", dir);
 928
 929 }
 930
 931 void
 932 ServerStartModule_WEBCIT
 933 (void)
 934 {
 935         HandlerHash = NewHash(1, NULL);
 936 }
 937
 938
 939 void
 940 ServerShutdownModule_WEBCIT
 941 (void)
 942 {
 943         FreeStrBuf(&csslocal);
 944         DeleteHash(&HandlerHash);
 945 }
 946
 947
 948
 949 void
 950 SessionNewModule_WEBCIT
 951 (wcsession *sess)
 952 {
 953         sess->ImportantMsg = NewStrBuf();
 954         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 955         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 956 }
 957
 958 void
 959 SessionDetachModule_WEBCIT
 960 (wcsession *sess)
 961 {
 962         DeleteHash(&sess->Directory);
 963
 964         FreeStrBuf(&sess->upload);
 965         sess->upload_length = 0;
 966
 967         FreeStrBuf(&sess->trailing_javascript);
 968
 969         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
 970         {
 971                 FreeStrBuf(&sess->WBuf);
 972                 sess->WBuf = NewStrBuf();
 973         }
 974         else
 975                 FlushStrBuf(sess->WBuf);
 976         FlushStrBuf(sess->HBuf);
 977 }
 978
 979 void
 980 SessionDestroyModule_WEBCIT
 981 (wcsession *sess)
 982 {
 983         FreeStrBuf(&sess->WBuf);
 984         FreeStrBuf(&sess->HBuf);
 985         FreeStrBuf(&sess->ImportantMsg);
 986         FreeStrBuf(&sess->PushedDestination);
 987 }
 988