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