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) 1996-2011 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  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #define SHOW_ME_VAPPEND_PRINTF
  18 #include <stdio.h>
  19 #include <stdarg.h>
  20 #include "webcit.h"
  21 #include "dav.h"
  22 #include "webserver.h"
  23
  24 StrBuf *csslocal = NULL;
  25 HashList *HandlerHash = NULL;
  26
  27 void stuff_to_cookie(int unset_cookie);
  28 extern int GetConnected(void);
  29
  30
  31 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  32 {
  33         wcsession *WCC = WC;
  34         int n;
  35
  36         n = GetCount(WCC->Hdr->HTTPHeaders);
  37         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  38 }
  39
  40 void DeleteWebcitHandler(void *vHandler)
  41 {
  42         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  43         FreeStrBuf(&Handler->Name);
  44         FreeStrBuf(&Handler->DisplayName);
  45         free (Handler);
  46 }
  47
  48 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  49                          const char *DisplayName, long dslen,
  50                          WebcitHandlerFunc F,
  51                          long Flags)
  52 {
  53         WebcitHandler *NewHandler;
  54         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  55         NewHandler->F = F;
  56         NewHandler->Flags = Flags;
  57         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  58         StrBufShrinkToFit(NewHandler->Name, 1);
  59         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  60         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  61         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  62 }
  63
  64 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  65 {
  66         wcsession *WCC = WC;
  67         if (WCC->Hdr->HR.Handler != NULL)
  68                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  69 }
  70
  71
  72 /*
  73  * web-printing funcion. uses our vsnprintf wrapper
  74  */
  75 #ifdef UBER_VERBOSE_DEBUGGING
  76 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  77 #else
  78 void wc_printf(const char *format,...)
  79 #endif
  80 {
  81         wcsession *WCC = WC;
  82         va_list arg_ptr;
  83
  84         if (WCC->WBuf == NULL)
  85                 WCC->WBuf = NewStrBuf();
  86 #ifdef UBER_VERBOSE_DEBUGGING
  87         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  88 #endif
  89
  90         va_start(arg_ptr, format);
  91         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  92         va_end(arg_ptr);
  93 #ifdef UBER_VERBOSE_DEBUGGING
  94         StrBufAppendPrintf(WCC->WBuf, "]\n");
  95 #endif
  96 }
  97
  98 /*
  99  * http-header-printing funcion. uses our vsnprintf wrapper
 100  */
 101 void hprintf(const char *format,...)
 102 {
 103         wcsession *WCC = WC;
 104         va_list arg_ptr;
 105
 106         va_start(arg_ptr, format);
 107         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 108         va_end(arg_ptr);
 109 }
 110
 111
 112
 113 /*
 114  * wrap up an HTTP session, closes tags, etc.
 115  *
 116  * print_standard_html_footer should be set to:
 117  * 0            - to transmit only,
 118  * nonzero      - to append the closing tags
 119  */
 120 void wDumpContent(int print_standard_html_footer)
 121 {
 122         if (print_standard_html_footer) {
 123                 wc_printf("</div> <!-- end of 'content' div -->\n");
 124                 do_template("trailing");
 125         }
 126
 127         /* If we've been saving it all up for one big output burst,
 128          * go ahead and do that now.
 129          */
 130         end_burst();
 131 }
 132
 133
 134
 135
 136 /*
 137  * Output HTTP headers and leading HTML for a page
 138  */
 139 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 140                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 141
 142                         int do_room_banner,     /* 0=no, 1=yes,
 143                                                  * 2 = I'm going to embed my own, so don't open the
 144                                                  *     <div id="content"> either.
 145                                                  */
 146
 147                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 148                         int suppress_check,     /* 1 = suppress check for instant messages        */
 149                         int cache               /* 1 = allow browser to cache this page      */
 150 ) {
 151         wcsession *WCC = WC;
 152         char httpnow[128];
 153
 154         hprintf("HTTP/1.1 200 OK\n");
 155         http_datestring(httpnow, sizeof httpnow, time(NULL));
 156
 157         if (do_httpheaders) {
 158                 if (WCC->serv_info != NULL)
 159                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 160                                 "Server: %s / %s\n"
 161                                 "Connection: close\r\n",
 162                                 PACKAGE_STRING,
 163                                 ChrPtr(WCC->serv_info->serv_software));
 164                 else
 165                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 166                                 "Server: %s / [n/a]\n"
 167                                 "Connection: close\r\n",
 168                                 PACKAGE_STRING);
 169         }
 170
 171         if (cache > 0) {
 172                 char httpTomorow[128];
 173
 174                 http_datestring(httpTomorow, sizeof httpTomorow,
 175                                 time(NULL) + 60 * 60 * 24 * 2);
 176
 177                 hprintf("Pragma: public\r\n"
 178                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 179                         "Last-modified: %s\r\n"
 180                         "Expires: %s\r\n",
 181                         httpnow,
 182                         httpTomorow
 183                 );
 184         }
 185         else {
 186                 hprintf("Pragma: no-cache\r\n"
 187                         "Cache-Control: no-store\r\n"
 188                         "Expires: -1\r\n"
 189                 );
 190         }
 191
 192         if (cache < 2) stuff_to_cookie(unset_cookies);
 193
 194         if (do_htmlhead) {
 195                 begin_burst();
 196                 do_template("head");
 197                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 198                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 199                 }
 200                 if (do_room_banner == 1) {
 201                         tmplput_roombanner(NULL, NULL);
 202                 }
 203         }
 204
 205         if (do_room_banner == 1) {
 206                 wc_printf("<div id=\"content\">\n");
 207         }
 208 }
 209
 210 void output_custom_content_header(const char *ctype) {
 211   hprintf("HTTP/1.1 200 OK\r\n");
 212   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 213   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 214   hprintf("Connection: close\r\n");
 215 }
 216
 217
 218 /*
 219  * Generic function to do an HTTP redirect.  Easy and fun.
 220  */
 221 void http_redirect(const char *whichpage) {
 222         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 223         hprintf("Location: %s\r\n", whichpage);
 224         hprintf("URI: %s\r\n", whichpage);
 225         hprintf("Content-type: text/html; charset=utf-8\r\n");
 226         stuff_to_cookie(0);
 227         begin_burst();
 228         wc_printf("<html><body>");
 229         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 230         wc_printf("</body></html>\n");
 231         end_burst();
 232 }
 233
 234
 235
 236 /*
 237  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 238  */
 239 void http_transmit_thing(const char *content_type, int is_static)
 240 {
 241
 242         syslog(9, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 243         output_headers(0, 0, 0, 0, 0, is_static);
 244
 245         hprintf("Content-type: %s\r\n"
 246                 "Server: %s\r\n"
 247                 "Connection: close\r\n",
 248                 content_type,
 249                 PACKAGE_STRING);
 250
 251         end_burst();
 252 }
 253
 254
 255 /*
 256  * Convenience functions to display a page containing only a string
 257  *
 258  * titlebarcolor        color of the titlebar of the frame
 259  * titlebarmsg          text to display in the title bar
 260  * messagetext          body of the box
 261  */
 262 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 263 {
 264         hprintf("HTTP/1.1 200 OK\n");
 265         output_headers(1, 1, 2, 0, 0, 0);
 266         wc_printf("<div id=\"banner\">\n");
 267         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 268         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 269         wc_printf("</td></tr></table>\n");
 270         wc_printf("</div>\n<div id=\"content\">\n");
 271         escputs(messagetext);
 272
 273         wc_printf("<hr />\n");
 274         wDumpContent(1);
 275 }
 276
 277
 278 /*
 279  * Display a blank page.
 280  */
 281 void blank_page(void) {
 282         output_headers(1, 1, 0, 0, 0, 0);
 283         wDumpContent(2);
 284 }
 285
 286
 287 /*
 288  * A template has been requested
 289  */
 290 void url_do_template(void) {
 291         const StrBuf *MimeType;
 292         const StrBuf *Tmpl = sbstr("template");
 293         begin_burst();
 294         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 295         http_transmit_thing(ChrPtr(MimeType), 0);
 296 }
 297
 298
 299
 300 /*
 301  * convenience function to indicate success
 302  */
 303 void display_success(const char *successmessage)
 304 {
 305         convenience_page("007700", "OK", successmessage);
 306 }
 307
 308
 309 /*
 310  * Authorization required page (sends a 401, causing the browser to request login credentials)
 311  */
 312 void authorization_required(void)
 313 {
 314         wcsession *WCC = WC;
 315         const char *message = "";
 316
 317         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 318         hprintf(
 319                 "Server: %s / %s\r\n"
 320                 "Connection: close\r\n",
 321                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 322         );
 323         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 324         hprintf("Content-Type: text/html\r\n");
 325         begin_burst();
 326         wc_printf("<h1>");
 327         wc_printf(_("Authorization Required"));
 328         wc_printf("</h1>\r\n");
 329
 330         if (WCC->ImportantMsg != NULL) {
 331                 message = ChrPtr(WCC->ImportantMsg);
 332         }
 333
 334         wc_printf(
 335                 _("The resource you requested requires a valid username and password. "
 336                 "You could not be logged in: %s\n"),
 337                 message
 338         );
 339         wDumpContent(0);
 340 }
 341
 342
 343 /*
 344  * Convenience functions to wrap around asynchronous ajax responses
 345  */
 346 void begin_ajax_response(void) {
 347         wcsession *WCC = WC;
 348
 349         FlushStrBuf(WCC->HBuf);
 350         output_headers(0, 0, 0, 0, 0, 0);
 351
 352         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 353                 "Server: %s\r\n"
 354                 "Connection: close\r\n"
 355                 ,
 356                 PACKAGE_STRING);
 357         begin_burst();
 358 }
 359
 360
 361 /*
 362  * print ajax response footer
 363  */
 364 void end_ajax_response(void) {
 365         wDumpContent(0);
 366 }
 367
 368
 369 /*
 370  * Wraps a Citadel server command in an AJAX transaction.
 371  */
 372 void ajax_servcmd(void)
 373 {
 374         wcsession *WCC = WC;
 375         int Done = 0;
 376         StrBuf *Buf;
 377         char *junk;
 378         size_t len;
 379
 380         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 381         begin_ajax_response();
 382         Buf = NewStrBuf();
 383         serv_puts(bstr("g_cmd"));
 384         StrBuf_ServGetln(Buf);
 385         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 386         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 387
 388         switch (GetServerStatus(Buf, NULL)) {
 389         case 8:
 390                 serv_puts("\n\n000");
 391                 if ( (StrLength(Buf)==3) &&
 392                      !strcmp(ChrPtr(Buf), "000")) {
 393                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 394                         break;
 395                 }
 396         case 1:
 397                 while (!Done) {
 398                         if (StrBuf_ServGetln(Buf) < 0)
 399                                 break;
 400                         if ( (StrLength(Buf)==3) &&
 401                              !strcmp(ChrPtr(Buf), "000")) {
 402                                 Done = 1;
 403                         }
 404                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 405                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 406                 }
 407                 break;
 408         case 4:
 409                 text_to_server(bstr("g_input"));
 410                 serv_puts("000");
 411                 break;
 412         case 6:
 413                 len = atol(&ChrPtr(Buf)[4]);
 414                 StrBuf_ServGetBLOBBuffered(Buf, len);
 415                 break;
 416         case 7:
 417                 len = atol(&ChrPtr(Buf)[4]);
 418                 junk = malloc(len);
 419                 memset(junk, 0, len);
 420                 serv_write(junk, len);
 421                 free(junk);
 422         }
 423
 424         end_ajax_response();
 425
 426         /*
 427          * This is kind of an ugly hack, but this is the only place it can go.
 428          * If the command was GEXP, then the instant messenger window must be
 429          * running, so reset the "last_pager_check" watchdog timer so
 430          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 431          */
 432         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 433                 WCC->last_pager_check = time(NULL);
 434         }
 435         FreeStrBuf(&Buf);
 436 }
 437
 438
 439 /*
 440  * Helper function for the asynchronous check to see if we need
 441  * to open the instant messenger window.
 442  */
 443 void seconds_since_last_gexp(void)
 444 {
 445         char buf[256];
 446
 447         if ( (time(NULL) - WC->last_pager_check) < 30) {
 448                 wc_printf("NO\n");
 449         }
 450         else {
 451                 memset(buf, 0, 5);
 452                 serv_puts("NOOP");
 453                 serv_getln(buf, sizeof buf);
 454                 if (buf[3] == '*') {
 455                         wc_printf("YES");
 456                 }
 457                 else {
 458                         wc_printf("NO");
 459                 }
 460         }
 461 }
 462
 463
 464 /*
 465  * Save a URL destination so we can go to it later
 466  */
 467 void push_destination(void) {
 468         wcsession *WCC = WC;
 469
 470         if (!WCC) {
 471                 wc_printf("no session");
 472                 return;
 473         }
 474
 475         FreeStrBuf(&WCC->PushedDestination);
 476         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 477         syslog(9, "Push: %s", ChrPtr(WCC->PushedDestination));
 478         wc_printf("OK");
 479 }
 480
 481
 482 /*
 483  * Go to the URL saved by push_destination()
 484  */
 485 void pop_destination(void) {
 486         wcsession *WCC = WC;
 487
 488         /*
 489          * If we are in the middle of a new user signup, the server may request that
 490          * we first pass through a registration screen.
 491          */
 492         if ((WCC) && (WCC->need_regi)) {
 493                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 494                         /* Registering will take us to the My Citadel Config room, so save our place */
 495                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 496                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 497                 }
 498                 WCC->need_regi = 0;
 499                 display_reg(1);
 500                 return;
 501         }
 502
 503         /*
 504          * Do something reasonable if we somehow ended up requesting a pop without
 505          * having first done a push.
 506          */
 507         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 508                 do_welcome();
 509                 return;
 510         }
 511
 512         /*
 513          * All righty then!  We have a destination saved, so go there now.
 514          */
 515         syslog(9, "Pop: %s", ChrPtr(WCC->PushedDestination));
 516         http_redirect(ChrPtr(WCC->PushedDestination));
 517 }
 518
 519
 520
 521 int ReadPostData(void)
 522 {
 523         int rc;
 524         int urlencoded_post = 0;
 525         wcsession *WCC = WC;
 526         StrBuf *content = NULL;
 527
 528         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 529
 530         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 531
 532         if (!urlencoded_post)
 533         {
 534                 StrBufPrintf(content,
 535                      "Content-type: %s\n"
 536                              "Content-length: %ld\n\n",
 537                              ChrPtr(WCC->Hdr->HR.ContentType),
 538                              WCC->Hdr->HR.ContentLength);
 539         }
 540
 541         /** Read the entire input data at once. */
 542         rc = client_read_to(WCC->Hdr, content,
 543                             WCC->Hdr->HR.ContentLength,
 544                             SLEEPING);
 545         if (rc < 0)
 546                 return rc;
 547
 548
 549         if (urlencoded_post) {
 550                 ParseURLParams(content);
 551         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 552                 char *Buf;
 553                 char *BufEnd;
 554                 long len;
 555
 556                 len = StrLength(content);
 557                 Buf = SmashStrBuf(&content);
 558                 BufEnd = Buf + len;
 559                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 560                 free(Buf);
 561         } else if (WCC->Hdr->HR.ContentLength > 0) {
 562                 WCC->upload = content;
 563                 WCC->upload_length = StrLength(WCC->upload);
 564                 content = NULL;
 565         }
 566         FreeStrBuf(&content);
 567         return 1;
 568 }
 569
 570
 571 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 572 {
 573         long Depth, IsDepth;
 574         long offset = 0;
 575         wcsession *WCC = WC;
 576
 577         if (WCC->Hdr->HR.Handler != NULL)
 578                 offset ++;
 579         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 580         IsDepth = GetCount(WCC->Directory) + offset;
 581
 582 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 583         if (Depth < 0) {
 584                 Depth = -Depth;
 585                 return IsDepth > Depth;
 586         }
 587         else
 588                 return Depth == IsDepth;
 589 }
 590
 591
 592
 593 /*
 594  * Entry point for WebCit transaction
 595  */
 596 void session_loop(void)
 597 {
 598         int xhttp;
 599         StrBuf *Buf;
 600
 601         /*
 602          * We stuff these with the values coming from the client cookies,
 603          * so we can use them to reconnect a timed out session if we have to.
 604          */
 605         wcsession *WCC;
 606
 607         WCC= WC;
 608         WCC->upload_length = 0;
 609         WCC->upload = NULL;
 610         WCC->Hdr->nWildfireHeaders = 0;
 611
 612         if (WCC->Hdr->HR.ContentLength > 0) {
 613                 if (ReadPostData() < 0) {
 614                         return;
 615                 }
 616         }
 617
 618         Buf = NewStrBuf();
 619         WCC->trailing_javascript = NewStrBuf();
 620
 621         /* Convert base64-encoded URL's back to plain text */
 622         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 623                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 624                 StrBufDecodeBase64(WCC->Hdr->this_page);
 625                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 626                 goto SKIP_ALL_THIS_CRAP;
 627         }
 628
 629         /* If there are variables in the URL, we must grab them now */
 630         if (WCC->Hdr->PlainArgs != NULL)
 631                 ParseURLParams(WCC->Hdr->PlainArgs);
 632
 633         /* If the client sent a nonce that is incorrect, kill the request. */
 634         if (havebstr("nonce")) {
 635                 syslog(9, "Comparing supplied nonce %s to session nonce %d",
 636                         bstr("nonce"), WCC->nonce
 637                 );
 638                 if (ibstr("nonce") != WCC->nonce) {
 639                         syslog(9, "Ignoring request with mismatched nonce.");
 640                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 641                         hprintf("Content-Type: text/plain\r\n");
 642                         begin_burst();
 643                         wc_printf("Security check failed.\r\n");
 644                         end_burst();
 645                         goto SKIP_ALL_THIS_CRAP;
 646                 }
 647         }
 648
 649         /*
 650          * If we're not connected to a Citadel server, try to hook up the connection now.
 651          */
 652         if (!WCC->connected) {
 653                 if (GetConnected()) {
 654                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 655                         hprintf("Content-Type: text/html\r\n");
 656                         begin_burst();
 657                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 658                         wc_printf(_("This program was unable to connect or stay "
 659                                 "connected to the Citadel server.  Please report "
 660                                 "this problem to your system administrator.")
 661                         );
 662                         wc_printf("<br>");
 663                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 664                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 665                                 _("Read More...")
 666                         );
 667                         wc_printf("</body></html>\n");
 668                         end_burst();
 669                         goto SKIP_ALL_THIS_CRAP;
 670                 }
 671         }
 672
 673         /*
 674          * If we're not logged in, but we have authentication data (either from
 675          * a cookie or from http-auth), try logging in to Citadel using that.
 676          */
 677         if (    (!WCC->logged_in)
 678                 && (StrLength(WCC->Hdr->c_username) > 0)
 679                 && (StrLength(WCC->Hdr->c_password) > 0)
 680         ) {
 681                 long Status;
 682
 683                 FlushStrBuf(Buf);
 684                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 685                 StrBuf_ServGetln(Buf);
 686                 if (GetServerStatus(Buf, &Status) == 3) {
 687                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 688                         StrBuf_ServGetln(Buf);
 689                         if (GetServerStatus(Buf, NULL) == 2) {
 690                                 become_logged_in(WCC->Hdr->c_username,
 691                                                  WCC->Hdr->c_password, Buf);
 692                         } else {
 693                                 /* Should only display when password is wrong */
 694                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 695                                 authorization_required();
 696                                 FreeStrBuf(&Buf);
 697                                 goto SKIP_ALL_THIS_CRAP;
 698                         }
 699                 }
 700                 else if (Status == 541) {
 701                         WCC->logged_in = 1;
 702                 }
 703         }
 704
 705         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 706                 (WCC->Hdr->HR.eReqType != ePOST) &&
 707                 (WCC->Hdr->HR.eReqType != eHEAD);
 708
 709         /*
 710          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 711          * prior to doing anything else.
 712          */
 713         if (havebstr("go")) {
 714                 int ret;
 715                 syslog(9, "Explicit room selection: %s", bstr("go"));
 716                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 717                 if ((ret/100) != 2) {
 718                         syslog(1, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 719                 }
 720         }
 721         else if (havebstr("gotofirst")) {
 722                 int ret;
 723                 syslog(9, "Explicit room selection: %s", bstr("gotofirst"));
 724                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 725                 if ((ret/100) != 2) {
 726                         syslog(1, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 727                 }
 728         }
 729
 730         /*
 731          * If we aren't in any room yet, but we have cookie data telling us where we're
 732          * supposed to be, and 'go' was not specified, then go there.
 733          */
 734         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 735                 int ret;
 736
 737                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...",
 738                         ChrPtr(WCC->CurRoom.name),
 739                         ChrPtr(WCC->Hdr->c_roomname)
 740                 );
 741                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 742                 if ((ret/100) != 2) {
 743                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 744                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 745                 }
 746         }
 747
 748         if (WCC->Hdr->HR.Handler != NULL) {
 749                 if (    (!WCC->logged_in)
 750                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 751                         && (WCC->serv_info->serv_supports_guest == 0)
 752                 ) {
 753                         display_login();
 754                 }
 755                 else {
 756                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 757                                 begin_ajax_response();
 758                         }
 759                         WCC->Hdr->HR.Handler->F();
 760                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 761                                 end_ajax_response();
 762                         }
 763                 }
 764         }
 765         /* When all else fails, display the default landing page or a main menu. */
 766         else {
 767                 /*
 768                  * ordinary browser users get a nice login screen, DAV etc. requsets
 769                  * are given a 401 so they can handle it appropriate.
 770                  */
 771                 if (!WCC->logged_in)  {
 772                         if (xhttp) {
 773                                 authorization_required();
 774                         }
 775                         else {
 776                                 display_default_landing_page();
 777                         }
 778                 }
 779                 /*
 780                  * Toplevel dav requests? or just a flat browser request?
 781                  */
 782                 else {
 783                         if (xhttp) {
 784                                 dav_main();
 785                         }
 786                         else {
 787                                 display_main_menu();
 788                         }
 789                 }
 790         }
 791
 792 SKIP_ALL_THIS_CRAP:
 793         FreeStrBuf(&Buf);
 794         fflush(stdout);
 795 }
 796
 797
 798
 799 /*
 800  * Display the appropriate landing page for this site.
 801  */
 802 void display_default_landing_page(void) {
 803         wcsession *WCC = WC;
 804
 805         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 806                 /* default action */
 807
 808                 if (havebstr("go")) {
 809                         syslog(9, "Explicit room selection: %s", bstr("go"));
 810                         StrBuf *teh_room = NewStrBufPlain(bstr("go"), strlen(bstr("go")));
 811                         smart_goto(teh_room);
 812                         FreeStrBuf(&teh_room);
 813                 }
 814                 else if (default_landing_page) {
 815                         http_redirect(default_landing_page);
 816                 }
 817                 else {
 818                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 819                         smart_goto(teh_lobby);
 820                         FreeStrBuf(&teh_lobby);
 821                 }
 822         }
 823         else {
 824                 display_login();
 825         }
 826 }
 827
 828
 829 /*
 830  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 831  */
 832 void sleeeeeeeeeep(int seconds)
 833 {
 834         struct timeval tv;
 835
 836         tv.tv_sec = seconds;
 837         tv.tv_usec = 0;
 838         select(0, NULL, NULL, NULL, &tv);
 839 }
 840
 841 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 842 {
 843         return is_https != 0;
 844 }
 845
 846 void AppendImportantMessage(const char *pch, long len)
 847 {
 848         wcsession *WCC = WC;
 849
 850         if (StrLength(WCC->ImportantMsg) > 0) {
 851                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 852         }
 853
 854         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 855 }
 856
 857 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 858 {
 859         wcsession *WCC = WC;
 860         if (WCC != NULL)
 861                 return (StrLength(WCC->ImportantMsg) > 0);
 862         else
 863                 return 0;
 864 }
 865
 866 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 867 {
 868         wcsession *WCC = WC;
 869
 870         if (WCC != NULL) {
 871                 if (StrLength(WCC->ImportantMsg) > 0) {
 872                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 873                         FlushStrBuf(WCC->ImportantMsg);
 874                 }
 875         }
 876 }
 877
 878 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 879 {
 880         wcsession *WCC = WC;
 881
 882         if (WCC != NULL)
 883                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 884 }
 885
 886 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 887 {
 888         StrBufAppendBuf(Target,
 889                         csslocal, 0);
 890 }
 891
 892 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 893 {
 894         StrBufAppendBufPlain(Target,
 895                              HKEY(PACKAGE_STRING), 0);
 896 }
 897
 898 extern char static_local_dir[PATH_MAX];
 899
 900
 901 void
 902 InitModule_WEBCIT
 903 (void)
 904 {
 905         char dir[SIZ];
 906         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 907         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 908         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 909         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 910         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 911         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 912         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 913         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 914
 915         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 916         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 917         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 918         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 919
 920         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 921         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 922         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 923         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 924         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 925
 926
 927         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 928         if (!access(dir, R_OK)) {
 929                 syslog(9, "Using local Stylesheet [%s]", dir);
 930                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 931         }
 932         else
 933                 syslog(9, "No Site-local Stylesheet [%s] installed.", dir);
 934
 935 }
 936
 937 void
 938 ServerStartModule_WEBCIT
 939 (void)
 940 {
 941         HandlerHash = NewHash(1, NULL);
 942 }
 943
 944
 945 void
 946 ServerShutdownModule_WEBCIT
 947 (void)
 948 {
 949         FreeStrBuf(&csslocal);
 950         DeleteHash(&HandlerHash);
 951 }
 952
 953
 954
 955 void
 956 SessionNewModule_WEBCIT
 957 (wcsession *sess)
 958 {
 959         sess->ImportantMsg = NewStrBuf();
 960         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 961         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 962 }
 963
 964 void
 965 SessionDetachModule_WEBCIT
 966 (wcsession *sess)
 967 {
 968         DeleteHash(&sess->Directory);
 969
 970         FreeStrBuf(&sess->upload);
 971         sess->upload_length = 0;
 972
 973         FreeStrBuf(&sess->trailing_javascript);
 974
 975         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
 976         {
 977                 FreeStrBuf(&sess->WBuf);
 978                 sess->WBuf = NewStrBuf();
 979         }
 980         else
 981                 FlushStrBuf(sess->WBuf);
 982         FlushStrBuf(sess->HBuf);
 983 }
 984
 985 void
 986 SessionDestroyModule_WEBCIT
 987 (wcsession *sess)
 988 {
 989         FreeStrBuf(&sess->WBuf);
 990         FreeStrBuf(&sess->HBuf);
 991         FreeStrBuf(&sess->ImportantMsg);
 992         FreeStrBuf(&sess->PushedDestination);
 993 }
 994