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