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