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) 1996-2013 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 extern int verbose;
  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         if (WCC->isFailure)
 145                 hprintf("HTTP/2.2 500 Internal Server Error");
 146         else if (WCC->Hdr->HaveRange > 1)
 147                 hprintf("HTTP/1.1 206 Partial Content\r\n");
 148         else
 149                 hprintf("HTTP/1.1 200 OK\r\n");
 150
 151         http_datestring(httpnow, sizeof httpnow, time(NULL));
 152
 153         if (do_httpheaders) {
 154                 if (WCC->serv_info != NULL)
 155                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 156                                 "Server: %s / %s\n"
 157                                 "Connection: close\r\n",
 158                                 PACKAGE_STRING,
 159                                 ChrPtr(WCC->serv_info->serv_software));
 160                 else
 161                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 162                                 "Server: %s / [n/a]\n"
 163                                 "Connection: close\r\n",
 164                                 PACKAGE_STRING);
 165         }
 166
 167         if (cache > 0) {
 168                 char httpTomorow[128];
 169
 170                 http_datestring(httpTomorow, sizeof httpTomorow,
 171                                 time(NULL) + 60 * 60 * 24 * 2);
 172
 173                 hprintf("Pragma: public\r\n"
 174                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 175                         "Last-modified: %s\r\n"
 176                         "Expires: %s\r\n",
 177                         httpnow,
 178                         httpTomorow
 179                 );
 180         }
 181         else {
 182                 hprintf("Pragma: no-cache\r\n"
 183                         "Cache-Control: no-store\r\n"
 184                         "Expires: -1\r\n"
 185                 );
 186         }
 187
 188         if (cache < 2) stuff_to_cookie(unset_cookies);
 189
 190         if (do_htmlhead) {
 191                 begin_burst();
 192                 do_template("head");
 193                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 194                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 195                 }
 196                 if (do_room_banner) {
 197                         tmplput_roombanner(NULL, NULL);
 198                 }
 199         }
 200
 201         if (do_room_banner) {
 202                 wc_printf("<div id=\"content\">\n");
 203         }
 204 }
 205
 206 void output_custom_content_header(const char *ctype) {
 207         hprintf("HTTP/1.1 200 OK\r\n");
 208         hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 209         hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 210         hprintf("Connection: close\r\n");
 211 }
 212
 213
 214 /*
 215  * Generic function to do an HTTP redirect.  Easy and fun.
 216  */
 217 void http_redirect(const char *whichpage) {
 218         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 219         hprintf("Location: %s\r\n", whichpage);
 220         hprintf("URI: %s\r\n", whichpage);
 221         hprintf("Content-type: text/html; charset=utf-8\r\n");
 222         stuff_to_cookie(0);
 223         begin_burst();
 224         wc_printf("<html><body>");
 225         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 226         wc_printf("</body></html>\n");
 227         end_burst();
 228 }
 229
 230
 231
 232 /*
 233  * Output a piece of content to the web browser using conformant HTTP and MIME semantics.
 234  *
 235  * If this function is called, it is expected that begin_burst() has already been called
 236  * and some sort of content has been fed into the buffer.  This function will transmit a
 237  * bunch of headers to the client.  end_burst() will add some headers of its own, and then
 238  * transmit the buffered content to the client.
 239  */
 240 void http_transmit_thing(const char *content_type, int is_static)
 241 {
 242         if (verbose)
 243                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 244         output_headers(0, 0, 0, 0, 0, is_static);
 245
 246         hprintf("Content-type: %s\r\n"
 247                 "Server: %s\r\n"
 248                 "Connection: close\r\n",
 249                 content_type,
 250                 PACKAGE_STRING);
 251
 252         end_burst();
 253 }
 254
 255 void http_transmit_headers(const char *content_type, int is_static, long is_chunked, int is_gzip)
 256 {
 257         wcsession *WCC = WC;
 258         if (verbose)
 259                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 260         output_headers(0, 0, 0, 0, 0, is_static);
 261
 262         if (is_gzip)
 263                 hprintf("Content-encoding: gzip\r\n");
 264
 265         if (WCC->Hdr->HaveRange)
 266                 hprintf("Accept-Ranges: bytes\r\n"
 267                         "Content-Range: bytes %ld-%ld/%ld\r\n",
 268                         WCC->Hdr->RangeStart,
 269                         WCC->Hdr->RangeTil,
 270                         WCC->Hdr->TotalBytes);
 271
 272         hprintf("Content-type: %s\r\n"
 273                 "Server: "PACKAGE_STRING"\r\n"
 274                 "%s"
 275                 "Connection: close\r\n\r\n",
 276                 content_type,
 277                 (is_chunked)?"Transfer-Encoding: chunked\r\n":"");
 278 }
 279
 280
 281 /*
 282  * Convenience functions to display a page containing only a string
 283  *
 284  * titlebarcolor        color of the titlebar of the frame
 285  * titlebarmsg          text to display in the title bar
 286  * messagetext          body of the box
 287  */
 288 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 289 {
 290         hprintf("HTTP/1.1 200 OK\n");
 291         output_headers(1, 1, 1, 0, 0, 0);
 292         wc_printf("<div id=\"room_banner_override\">\n");
 293         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 294         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 295         wc_printf("</td></tr></table>\n");
 296         wc_printf("</div>\n<div id=\"content\">\n");
 297         escputs(messagetext);
 298         wc_printf("<hr />\n");
 299         wDumpContent(1);
 300 }
 301
 302
 303 /*
 304  * Display a blank page.
 305  */
 306 void blank_page(void) {
 307         output_headers(1, 1, 0, 0, 0, 0);
 308         wDumpContent(2);
 309 }
 310
 311
 312 /*
 313  * A template has been requested
 314  */
 315 void url_do_template(void) {
 316         const StrBuf *MimeType;
 317         const StrBuf *Tmpl = sbstr("template");
 318         begin_burst();
 319         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 320         http_transmit_thing(ChrPtr(MimeType), 0);
 321 }
 322
 323
 324
 325 /*
 326  * convenience function to indicate success
 327  */
 328 void display_success(const char *successmessage)
 329 {
 330         convenience_page("007700", "OK", successmessage);
 331 }
 332
 333
 334 /*
 335  * Authorization required page (sends a 401, causing the browser to request login credentials)
 336  */
 337 void authorization_required(void)
 338 {
 339         wcsession *WCC = WC;
 340         const char *message = "";
 341
 342         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 343         hprintf(
 344                 "Server: %s / %s\r\n"
 345                 "Connection: close\r\n",
 346                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 347         );
 348         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 349
 350         /* if this is a false cookie authentication, remove it to avoid endless loops. */
 351         if (StrLength(WCC->Hdr->HR.RawCookie) > 0)
 352                 stuff_to_cookie(1);
 353
 354         hprintf("Content-Type: text/html\r\n");
 355         begin_burst();
 356         wc_printf("<h1>");
 357         wc_printf(_("Authorization Required"));
 358         wc_printf("</h1>\r\n");
 359
 360         if (WCC->ImportantMsg != NULL) {
 361                 message = ChrPtr(WCC->ImportantMsg);
 362         }
 363
 364         wc_printf(
 365                 _("The resource you requested requires a valid username and password. "
 366                 "You could not be logged in: %s\n"),
 367                 message
 368         );
 369         wDumpContent(0);
 370 }
 371
 372
 373 /*
 374  * Convenience functions to wrap around asynchronous ajax responses
 375  */
 376 void begin_ajax_response(void) {
 377         wcsession *WCC = WC;
 378
 379         FlushStrBuf(WCC->HBuf);
 380         output_headers(0, 0, 0, 0, 0, 0);
 381
 382         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 383                 "Server: %s\r\n"
 384                 "Connection: close\r\n"
 385                 ,
 386                 PACKAGE_STRING);
 387         begin_burst();
 388 }
 389
 390
 391 /*
 392  * print ajax response footer
 393  */
 394 void end_ajax_response(void) {
 395         wDumpContent(0);
 396 }
 397
 398
 399 /*
 400  * Wraps a Citadel server command in an AJAX transaction.
 401  */
 402 void ajax_servcmd(void)
 403 {
 404         wcsession *WCC = WC;
 405         int Done = 0;
 406         StrBuf *Buf;
 407         char *junk;
 408         size_t len;
 409
 410         if (verbose)
 411                 syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 412         begin_ajax_response();
 413         Buf = NewStrBuf();
 414         serv_puts(bstr("g_cmd"));
 415         StrBuf_ServGetln(Buf);
 416         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 417         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 418
 419         switch (GetServerStatus(Buf, NULL)) {
 420         case 8:
 421                 serv_puts("\n\n000");
 422                 if ( (StrLength(Buf)==3) &&
 423                      !strcmp(ChrPtr(Buf), "000")) {
 424                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 425                         break;
 426                 }
 427         case 1:
 428                 while (!Done) {
 429                         if (StrBuf_ServGetln(Buf) < 0)
 430                                 break;
 431                         if ( (StrLength(Buf)==3) &&
 432                              !strcmp(ChrPtr(Buf), "000")) {
 433                                 Done = 1;
 434                         }
 435                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 436                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 437                 }
 438                 break;
 439         case 4:
 440                 text_to_server(bstr("g_input"));
 441                 serv_puts("000");
 442                 break;
 443         case 6:
 444                 len = atol(&ChrPtr(Buf)[4]);
 445                 StrBuf_ServGetBLOBBuffered(Buf, len);
 446                 break;
 447         case 7:
 448                 len = atol(&ChrPtr(Buf)[4]);
 449                 junk = malloc(len);
 450                 memset(junk, 0, len);
 451                 serv_write(junk, len);
 452                 free(junk);
 453         }
 454
 455         end_ajax_response();
 456
 457         /*
 458          * This is kind of an ugly hack, but this is the only place it can go.
 459          * If the command was GEXP, then the instant messenger window must be
 460          * running, so reset the "last_pager_check" watchdog timer so
 461          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 462          */
 463         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 464                 WCC->last_pager_check = time(NULL);
 465         }
 466         FreeStrBuf(&Buf);
 467 }
 468
 469
 470 /*
 471  * Helper function for the asynchronous check to see if we need
 472  * to open the instant messenger window.
 473  */
 474 void seconds_since_last_gexp(void)
 475 {
 476         char buf[256];
 477
 478         if ( (time(NULL) - WC->last_pager_check) < 30) {
 479                 wc_printf("NO\n");
 480         }
 481         else {
 482                 memset(buf, 0, 5);
 483                 serv_puts("NOOP");
 484                 serv_getln(buf, sizeof buf);
 485                 if (buf[3] == '*') {
 486                         wc_printf("YES");
 487                 }
 488                 else {
 489                         wc_printf("NO");
 490                 }
 491         }
 492 }
 493
 494
 495 /*
 496  * Save a URL destination so we can go to it later
 497  */
 498 void push_destination(void) {
 499         wcsession *WCC = WC;
 500
 501         if (!WCC) {
 502                 wc_printf("no session");
 503                 return;
 504         }
 505
 506         FreeStrBuf(&WCC->PushedDestination);
 507         WCC->PushedDestination = NewStrBufDup(sbstr("url"));
 508         if (verbose)
 509                 syslog(LOG_DEBUG, "Push: %s", ChrPtr(WCC->PushedDestination));
 510         wc_printf("OK");
 511 }
 512
 513
 514 /*
 515  * Go to the URL saved by push_destination()
 516  */
 517 void pop_destination(void) {
 518         wcsession *WCC = WC;
 519
 520         /*
 521          * If we are in the middle of a new user signup, the server may request that
 522          * we first pass through a registration screen.
 523          */
 524         if ((WCC) && (WCC->need_regi)) {
 525                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 526                         /* Registering will take us to the My Citadel Config room, so save our place */
 527                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 528                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 529                 }
 530                 WCC->need_regi = 0;
 531                 display_reg(1);
 532                 return;
 533         }
 534
 535         /*
 536          * Do something reasonable if we somehow ended up requesting a pop without
 537          * having first done a push.
 538          */
 539         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 540                 do_welcome();
 541                 return;
 542         }
 543
 544         /*
 545          * All righty then!  We have a destination saved, so go there now.
 546          */
 547         if (verbose)
 548                 syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WCC->PushedDestination));
 549         http_redirect(ChrPtr(WCC->PushedDestination));
 550 }
 551
 552
 553
 554 int ReadPostData(void)
 555 {
 556         int rc;
 557         int urlencoded_post = 0;
 558         wcsession *WCC = WC;
 559         StrBuf *content = NULL;
 560
 561         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 562
 563         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 564
 565         if (!urlencoded_post)
 566         {
 567                 StrBufPrintf(content,
 568                      "Content-type: %s\n"
 569                              "Content-length: %ld\n\n",
 570                              ChrPtr(WCC->Hdr->HR.ContentType),
 571                              WCC->Hdr->HR.ContentLength);
 572         }
 573
 574         /** Read the entire input data at once. */
 575         rc = client_read_to(WCC->Hdr, content,
 576                             WCC->Hdr->HR.ContentLength,
 577                             SLEEPING);
 578         if (rc < 0)
 579                 return rc;
 580
 581
 582         if (urlencoded_post) {
 583                 ParseURLParams(content);
 584         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 585                 char *Buf;
 586                 char *BufEnd;
 587                 long len;
 588
 589                 len = StrLength(content);
 590                 Buf = SmashStrBuf(&content);
 591                 BufEnd = Buf + len;
 592                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 593                 free(Buf);
 594         } else if (WCC->Hdr->HR.ContentLength > 0) {
 595                 WCC->upload = content;
 596                 WCC->upload_length = StrLength(WCC->upload);
 597                 content = NULL;
 598         }
 599         FreeStrBuf(&content);
 600         return 1;
 601 }
 602
 603
 604 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 605 {
 606         long Depth, IsDepth;
 607         long offset = 0;
 608         wcsession *WCC = WC;
 609
 610         if (WCC->Hdr->HR.Handler != NULL)
 611                 offset ++;
 612         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 613         IsDepth = GetCount(WCC->Directory) + offset;
 614
 615 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 616         if (Depth < 0) {
 617                 Depth = -Depth;
 618                 return IsDepth > Depth;
 619         }
 620         else
 621                 return Depth == IsDepth;
 622 }
 623
 624
 625
 626 /*
 627  * Entry point for WebCit transaction
 628  */
 629 void session_loop(void)
 630 {
 631         int xhttp;
 632         StrBuf *Buf;
 633
 634         /*
 635          * We stuff these with the values coming from the client cookies,
 636          * so we can use them to reconnect a timed out session if we have to.
 637          */
 638         wcsession *WCC;
 639
 640         WCC= WC;
 641         WCC->upload_length = 0;
 642         WCC->upload = NULL;
 643         WCC->Hdr->nWildfireHeaders = 0;
 644
 645         if (WCC->Hdr->HR.ContentLength > 0) {
 646                 if (ReadPostData() < 0) {
 647                         return;
 648                 }
 649         }
 650
 651         Buf = NewStrBuf();
 652         WCC->trailing_javascript = NewStrBuf();
 653
 654         /* Convert base64-encoded URL's back to plain text */
 655         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 656                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 657                 StrBufDecodeBase64(WCC->Hdr->this_page);
 658                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 659                 goto SKIP_ALL_THIS_CRAP;
 660         }
 661
 662         /* If there are variables in the URL, we must grab them now */
 663         if (WCC->Hdr->PlainArgs != NULL)
 664                 ParseURLParams(WCC->Hdr->PlainArgs);
 665
 666         /* If the client sent a nonce that is incorrect, kill the request. */
 667         if (havebstr("nonce")) {
 668                 if (verbose)
 669                         syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d",
 670                                bstr("nonce"), WCC->nonce
 671                                 );
 672                 if (ibstr("nonce") != WCC->nonce) {
 673                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 674                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 675                         hprintf("Content-Type: text/plain\r\n");
 676                         begin_burst();
 677                         wc_printf("Security check failed.\r\n");
 678                         end_burst();
 679                         goto SKIP_ALL_THIS_CRAP;
 680                 }
 681         }
 682
 683         /*
 684          * If we're not connected to a Citadel server, try to hook up the connection now.
 685          */
 686         if (!WCC->connected) {
 687                 if (GetConnected()) {
 688                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 689                         hprintf("Content-Type: text/html\r\n");
 690                         begin_burst();
 691                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 692                         wc_printf(_("This program was unable to connect or stay "
 693                                 "connected to the Citadel server.  Please report "
 694                                 "this problem to your system administrator.")
 695                         );
 696                         wc_printf("<br>");
 697                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 698                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 699                                 _("Read More...")
 700                         );
 701                         wc_printf("</body></html>\n");
 702                         end_burst();
 703                         goto SKIP_ALL_THIS_CRAP;
 704                 }
 705         }
 706
 707         /*
 708          * If we're not logged in, but we have authentication data (either from
 709          * a cookie or from http-auth), try logging in to Citadel using that.
 710          */
 711         if (    (!WCC->logged_in)
 712                 && (StrLength(WCC->Hdr->c_username) > 0)
 713                 && (StrLength(WCC->Hdr->c_password) > 0)
 714         ) {
 715                 long Status;
 716
 717                 FlushStrBuf(Buf);
 718                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 719                 StrBuf_ServGetln(Buf);
 720                 if (GetServerStatus(Buf, &Status) == 3) {
 721                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 722                         StrBuf_ServGetln(Buf);
 723                         if (GetServerStatus(Buf, NULL) == 2) {
 724                                 become_logged_in(WCC->Hdr->c_username,
 725                                                  WCC->Hdr->c_password, Buf);
 726                         } else {
 727                                 /* Should only display when password is wrong */
 728                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 729                                 authorization_required();
 730                                 FreeStrBuf(&Buf);
 731                                 goto SKIP_ALL_THIS_CRAP;
 732                         }
 733                 }
 734                 else if (Status == 541) {
 735                         WCC->logged_in = 1;
 736                 }
 737         }
 738
 739         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 740                 (WCC->Hdr->HR.eReqType != ePOST) &&
 741                 (WCC->Hdr->HR.eReqType != eHEAD);
 742
 743         /*
 744          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 745          * prior to doing anything else.
 746          */
 747         if (havebstr("go")) {
 748                 int ret;
 749                 if (verbose)
 750                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 751                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 752                 if ((ret/100) != 2) {
 753                         if (verbose)
 754                                 syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 755                 }
 756         }
 757         else if (havebstr("gotofirst")) {
 758                 int ret;
 759                 if (verbose)
 760                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 761                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 762                 if ((ret/100) != 2) {
 763                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 764                 }
 765         }
 766
 767         /*
 768          * If we aren't in any room yet, but we have cookie data telling us where we're
 769          * supposed to be, and 'go' was not specified, then go there.
 770          */
 771         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 772                 int ret;
 773
 774                 if (verbose)
 775                         syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 776                                ChrPtr(WCC->CurRoom.name),
 777                                ChrPtr(WCC->Hdr->c_roomname)
 778                 );
 779                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 780                 if ((ret/100) != 2) {
 781                         if (verbose)
 782                                 syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 783                                        ChrPtr(WCC->Hdr->c_roomname), ret);
 784                 }
 785         }
 786
 787         if (WCC->Hdr->HR.Handler != NULL) {
 788                 if (    (!WCC->logged_in)
 789                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 790                         && (WCC->serv_info != NULL)
 791                         && (WCC->serv_info->serv_supports_guest == 0)
 792                 ) {
 793                         display_login();
 794                 }
 795                 else {
 796                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 797                                 begin_ajax_response();
 798                         }
 799                         WCC->Hdr->HR.Handler->F();
 800                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 801                                 end_ajax_response();
 802                         }
 803                 }
 804         }
 805         /* When all else fails, display the default landing page or a main menu. */
 806         else {
 807                 /*
 808                  * ordinary browser users get a nice login screen, DAV etc. requsets
 809                  * are given a 401 so they can handle it appropriate.
 810                  */
 811                 if (!WCC->logged_in)  {
 812                         if (xhttp) {
 813                                 authorization_required();
 814                         }
 815                         else {
 816                                 display_default_landing_page();
 817                         }
 818                 }
 819                 /*
 820                  * Toplevel dav requests? or just a flat browser request?
 821                  */
 822                 else {
 823                         if (xhttp) {
 824                                 dav_main();
 825                         }
 826                         else {
 827                                 display_main_menu();
 828                         }
 829                 }
 830         }
 831
 832 SKIP_ALL_THIS_CRAP:
 833         FreeStrBuf(&Buf);
 834         fflush(stdout);
 835 }
 836
 837
 838
 839 /*
 840  * Display the appropriate landing page for this site.
 841  */
 842 void display_default_landing_page(void) {
 843         wcsession *WCC = WC;
 844
 845         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 846                 /* default action */
 847
 848                 if (havebstr("go")) {
 849                         if (verbose)
 850                                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 851                         smart_goto(sbstr("go"));
 852                 }
 853                 else if (default_landing_page) {
 854                         http_redirect(default_landing_page);
 855                 }
 856                 else {
 857                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 858                         smart_goto(teh_lobby);
 859                         FreeStrBuf(&teh_lobby);
 860                 }
 861         }
 862         else {
 863                 display_login();
 864         }
 865 }
 866
 867
 868 /*
 869  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 870  */
 871 void sleeeeeeeeeep(int seconds)
 872 {
 873         struct timeval tv;
 874
 875         tv.tv_sec = seconds;
 876         tv.tv_usec = 0;
 877         select(0, NULL, NULL, NULL, &tv);
 878 }
 879
 880 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 881 {
 882         return is_https != 0;
 883 }
 884
 885 void AppendImportantMessage(const char *pch, long len)
 886 {
 887         wcsession *WCC = WC;
 888
 889         if (StrLength(WCC->ImportantMsg) > 0) {
 890                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 891         }
 892
 893         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 894 }
 895
 896 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 897 {
 898         wcsession *WCC = WC;
 899         if (WCC != NULL)
 900                 return (StrLength(WCC->ImportantMsg) > 0);
 901         else
 902                 return 0;
 903 }
 904
 905 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 906 {
 907         wcsession *WCC = WC;
 908
 909         if (WCC != NULL) {
 910                 if (StrLength(WCC->ImportantMsg) > 0) {
 911                         StrBufAppendTemplate(Target, TP, WCC->ImportantMsg, 0);
 912                 }
 913         }
 914 }
 915
 916 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 917 {
 918         wcsession *WCC = WC;
 919
 920         if (WCC != NULL)
 921                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 922 }
 923
 924 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 925 {
 926         StrBufAppendBuf(Target,
 927                         csslocal, 0);
 928 }
 929
 930 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 931 {
 932         StrBufAppendBufPlain(Target,
 933                              HKEY(PACKAGE_STRING), 0);
 934 }
 935
 936 extern char static_local_dir[PATH_MAX];
 937
 938
 939 void
 940 InitModule_WEBCIT
 941 (void)
 942 {
 943         char dir[SIZ];
 944         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 945         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 946         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 947         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 948         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 949         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 950         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 951         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 952
 953         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 954         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 955         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 956         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 957
 958         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 959         RegisterNamespace("IMPORTANTMESSAGE", 0, 1, tmplput_importantmessage, NULL, CTX_NONE);
 960         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 961         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 962         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 963
 964
 965         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 966         if (!access(dir, R_OK)) {
 967                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 968                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 969         }
 970         else
 971                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 972
 973 }
 974
 975 void
 976 ServerStartModule_WEBCIT
 977 (void)
 978 {
 979         HandlerHash = NewHash(1, NULL);
 980 }
 981
 982
 983 void
 984 ServerShutdownModule_WEBCIT
 985 (void)
 986 {
 987         FreeStrBuf(&csslocal);
 988         DeleteHash(&HandlerHash);
 989 }
 990
 991
 992
 993 void
 994 SessionNewModule_WEBCIT
 995 (wcsession *sess)
 996 {
 997         sess->ImportantMsg = NewStrBuf();
 998         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 999         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
1000 }
1001
1002 void
1003 SessionDetachModule_WEBCIT
1004 (wcsession *sess)
1005 {
1006         DeleteHash(&sess->Directory);
1007
1008         FreeStrBuf(&sess->upload);
1009         sess->upload_length = 0;
1010
1011         FreeStrBuf(&sess->trailing_javascript);
1012
1013         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1014         {
1015                 FreeStrBuf(&sess->WBuf);
1016                 sess->WBuf = NewStrBuf();
1017         }
1018         else
1019                 FlushStrBuf(sess->WBuf);
1020         FlushStrBuf(sess->HBuf);
1021         if (StrLength(sess->ImportantMsg) > 0) {
1022                 FlushStrBuf(sess->ImportantMsg);
1023         }
1024
1025 }
1026
1027 void
1028 SessionDestroyModule_WEBCIT
1029 (wcsession *sess)
1030 {
1031         FreeStrBuf(&sess->WBuf);
1032         FreeStrBuf(&sess->HBuf);
1033         FreeStrBuf(&sess->ImportantMsg);
1034         FreeStrBuf(&sess->PushedDestination);
1035 }
1036