webcit/webcit.c

   1 /*
   2  * This is the main transaction loop of the web service.  It maintains a
   3  * persistent session to the Citadel server, handling HTTP WebCit requests as
   4  * they arrive and presenting a user interface.
   5  *
   6  * Copyright (c) 1996-2011 by the citadel.org team
   7  *
   8  * This program is open source software.  You can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 3 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #define SHOW_ME_VAPPEND_PRINTF
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include "webcit.h"
  27 #include "dav.h"
  28 #include "webserver.h"
  29
  30 StrBuf *csslocal = NULL;
  31 HashList *HandlerHash = NULL;
  32
  33 void stuff_to_cookie(int unset_cookie);
  34 extern int GetConnected(void);
  35
  36
  37 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  38 {
  39         wcsession *WCC = WC;
  40         int n;
  41
  42         n = GetCount(WCC->Hdr->HTTPHeaders);
  43         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  44 }
  45
  46 void DeleteWebcitHandler(void *vHandler)
  47 {
  48         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  49         FreeStrBuf(&Handler->Name);
  50         FreeStrBuf(&Handler->DisplayName);
  51         free (Handler);
  52 }
  53
  54 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  55                          const char *DisplayName, long dslen,
  56                          WebcitHandlerFunc F,
  57                          long Flags)
  58 {
  59         WebcitHandler *NewHandler;
  60         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  61         NewHandler->F = F;
  62         NewHandler->Flags = Flags;
  63         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  64         StrBufShrinkToFit(NewHandler->Name, 1);
  65         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  66         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  67         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  68 }
  69
  70 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  71 {
  72         wcsession *WCC = WC;
  73         if (WCC->Hdr->HR.Handler != NULL)
  74                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  75 }
  76
  77
  78 /*
  79  * web-printing funcion. uses our vsnprintf wrapper
  80  */
  81 #ifdef UBER_VERBOSE_DEBUGGING
  82 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  83 #else
  84 void wc_printf(const char *format,...)
  85 #endif
  86 {
  87         wcsession *WCC = WC;
  88         va_list arg_ptr;
  89
  90         if (WCC->WBuf == NULL)
  91                 WCC->WBuf = NewStrBuf();
  92 #ifdef UBER_VERBOSE_DEBUGGING
  93         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  94 #endif
  95
  96         va_start(arg_ptr, format);
  97         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  98         va_end(arg_ptr);
  99 #ifdef UBER_VERBOSE_DEBUGGING
 100         StrBufAppendPrintf(WCC->WBuf, "]\n");
 101 #endif
 102 }
 103
 104 /*
 105  * http-header-printing funcion. uses our vsnprintf wrapper
 106  */
 107 void hprintf(const char *format,...)
 108 {
 109         wcsession *WCC = WC;
 110         va_list arg_ptr;
 111
 112         va_start(arg_ptr, format);
 113         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 114         va_end(arg_ptr);
 115 }
 116
 117
 118
 119 /*
 120  * wrap up an HTTP session, closes tags, etc.
 121  *
 122  * print_standard_html_footer should be set to:
 123  * 0            - to transmit only,
 124  * nonzero      - to append the closing tags
 125  */
 126 void wDumpContent(int print_standard_html_footer)
 127 {
 128         if (print_standard_html_footer) {
 129                 wc_printf("</div> <!-- end of 'content' div -->\n");
 130                 do_template("trailing");
 131         }
 132
 133         /* If we've been saving it all up for one big output burst,
 134          * go ahead and do that now.
 135          */
 136         end_burst();
 137 }
 138
 139
 140
 141
 142 /*
 143  * Output HTTP headers and leading HTML for a page
 144  */
 145 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 146                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 147
 148                         int do_room_banner,     /* 0=no, 1=yes,
 149                                                  * 2 = I'm going to embed my own, so don't open the
 150                                                  *     <div id="content"> either.
 151                                                  */
 152
 153                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 154                         int suppress_check,     /* 1 = suppress check for instant messages        */
 155                         int cache               /* 1 = allow browser to cache this page      */
 156 ) {
 157         wcsession *WCC = WC;
 158         char httpnow[128];
 159
 160         hprintf("HTTP/1.1 200 OK\n");
 161         http_datestring(httpnow, sizeof httpnow, time(NULL));
 162
 163         if (do_httpheaders) {
 164                 if (WCC->serv_info != NULL)
 165                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 166                                 "Server: %s / %s\n"
 167                                 "Connection: close\r\n",
 168                                 PACKAGE_STRING,
 169                                 ChrPtr(WCC->serv_info->serv_software));
 170                 else
 171                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 172                                 "Server: %s / [n/a]\n"
 173                                 "Connection: close\r\n",
 174                                 PACKAGE_STRING);
 175         }
 176
 177         if (cache > 0) {
 178                 char httpTomorow[128];
 179
 180                 http_datestring(httpTomorow, sizeof httpTomorow,
 181                                 time(NULL) + 60 * 60 * 24 * 2);
 182
 183                 hprintf("Pragma: public\r\n"
 184                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 185                         "Last-modified: %s\r\n"
 186                         "Expires: %s\r\n",
 187                         httpnow,
 188                         httpTomorow
 189                 );
 190         }
 191         else {
 192                 hprintf("Pragma: no-cache\r\n"
 193                         "Cache-Control: no-store\r\n"
 194                         "Expires: -1\r\n"
 195                 );
 196         }
 197
 198         if (cache < 2) stuff_to_cookie(unset_cookies);
 199
 200         if (do_htmlhead) {
 201                 begin_burst();
 202                 do_template("head");
 203
 204                 /* check for ImportantMessages (these display in a div overlaying the main screen) */
 205                 if (StrLength(WCC->ImportantMsg) > 0) {
 206                         wc_printf("<div id=\"important_message\">\n"
 207                                 "<span class=\"imsg\">");
 208                         StrEscAppend(WCC->WBuf, WCC->ImportantMsg, NULL, 0, 0);
 209                         wc_printf("</span><br>\n"
 210                                 "</div>\n"
 211                         );
 212                         StrBufAppendBufPlain(WCC->trailing_javascript,
 213                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 214                                              0
 215                         );
 216                         FlushStrBuf(WCC->ImportantMsg);
 217                 }
 218                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 219                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 220                 }
 221
 222                 if (do_room_banner == 1) {
 223                         tmplput_roombanner(NULL, NULL);
 224                 }
 225         }
 226
 227         if (do_room_banner == 1) {
 228                 wc_printf("<div id=\"content\">\n");
 229         }
 230 }
 231
 232 void output_custom_content_header(const char *ctype) {
 233   hprintf("HTTP/1.1 200 OK\r\n");
 234   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 235   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 236   hprintf("Connection: close\r\n");
 237 }
 238
 239
 240 /*
 241  * Generic function to do an HTTP redirect.  Easy and fun.
 242  */
 243 void http_redirect(const char *whichpage) {
 244         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 245         hprintf("Location: %s\r\n", whichpage);
 246         hprintf("URI: %s\r\n", whichpage);
 247         hprintf("Content-type: text/html; charset=utf-8\r\n");
 248         begin_burst();
 249         wc_printf("<html><body>");
 250         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 251         wc_printf("</body></html>\n");
 252         end_burst();
 253 }
 254
 255
 256
 257 /*
 258  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 259  */
 260 void http_transmit_thing(const char *content_type, int is_static)
 261 {
 262
 263         syslog(9, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 264         output_headers(0, 0, 0, 0, 0, is_static);
 265
 266         hprintf("Content-type: %s\r\n"
 267                 "Server: %s\r\n"
 268                 "Connection: close\r\n",
 269                 content_type,
 270                 PACKAGE_STRING);
 271
 272         end_burst();
 273 }
 274
 275
 276 /*
 277  * Convenience functions to display a page containing only a string
 278  *
 279  * titlebarcolor        color of the titlebar of the frame
 280  * titlebarmsg          text to display in the title bar
 281  * messagetext          body of the box
 282  */
 283 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 284 {
 285         hprintf("HTTP/1.1 200 OK\n");
 286         output_headers(1, 1, 2, 0, 0, 0);
 287         wc_printf("<div id=\"banner\">\n");
 288         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 289         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 290         wc_printf("</td></tr></table>\n");
 291         wc_printf("</div>\n<div id=\"content\">\n");
 292         escputs(messagetext);
 293
 294         wc_printf("<hr />\n");
 295         wDumpContent(1);
 296 }
 297
 298
 299 /*
 300  * Display a blank page.
 301  */
 302 void blank_page(void) {
 303         output_headers(1, 1, 0, 0, 0, 0);
 304         wDumpContent(2);
 305 }
 306
 307
 308 /*
 309  * A template has been requested
 310  */
 311 void url_do_template(void) {
 312         const StrBuf *MimeType;
 313         const StrBuf *Tmpl = sbstr("template");
 314         begin_burst();
 315         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 316         http_transmit_thing(ChrPtr(MimeType), 0);
 317 }
 318
 319
 320
 321 /*
 322  * convenience function to indicate success
 323  */
 324 void display_success(const char *successmessage)
 325 {
 326         convenience_page("007700", "OK", successmessage);
 327 }
 328
 329
 330 /*
 331  * Authorization required page (sends a 401, causing the browser to request login credentials)
 332  */
 333 void authorization_required(void)
 334 {
 335         wcsession *WCC = WC;
 336         const char *message = "";
 337
 338         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 339         hprintf(
 340                 "Server: %s / %s\r\n"
 341                 "Connection: close\r\n",
 342                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 343         );
 344         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 345         hprintf("Content-Type: text/html\r\n");
 346         begin_burst();
 347         wc_printf("<h1>");
 348         wc_printf(_("Authorization Required"));
 349         wc_printf("</h1>\r\n");
 350
 351         if (WCC->ImportantMsg != NULL) {
 352                 message = ChrPtr(WCC->ImportantMsg);
 353         }
 354
 355         wc_printf(
 356                 _("The resource you requested requires a valid username and password. "
 357                 "You could not be logged in: %s\n"),
 358                 message
 359         );
 360         wDumpContent(0);
 361 }
 362
 363
 364 /*
 365  * Convenience functions to wrap around asynchronous ajax responses
 366  */
 367 void begin_ajax_response(void) {
 368         wcsession *WCC = WC;
 369
 370         FlushStrBuf(WCC->HBuf);
 371         output_headers(0, 0, 0, 0, 0, 0);
 372
 373         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 374                 "Server: %s\r\n"
 375                 "Connection: close\r\n"
 376                 ,
 377                 PACKAGE_STRING);
 378         begin_burst();
 379 }
 380
 381
 382 /*
 383  * print ajax response footer
 384  */
 385 void end_ajax_response(void) {
 386         wDumpContent(0);
 387 }
 388
 389
 390 /*
 391  * Wraps a Citadel server command in an AJAX transaction.
 392  */
 393 void ajax_servcmd(void)
 394 {
 395         wcsession *WCC = WC;
 396         int Done = 0;
 397         StrBuf *Buf;
 398         char *junk;
 399         size_t len;
 400
 401         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 402         begin_ajax_response();
 403         Buf = NewStrBuf();
 404         serv_puts(bstr("g_cmd"));
 405         StrBuf_ServGetln(Buf);
 406         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 407         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 408
 409         switch (GetServerStatus(Buf, NULL)) {
 410         case 8:
 411                 serv_puts("\n\n000");
 412                 if ( (StrLength(Buf)==3) &&
 413                      !strcmp(ChrPtr(Buf), "000")) {
 414                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 415                         break;
 416                 }
 417         case 1:
 418                 while (!Done) {
 419                         if (StrBuf_ServGetln(Buf) < 0)
 420                                 break;
 421                         if ( (StrLength(Buf)==3) &&
 422                              !strcmp(ChrPtr(Buf), "000")) {
 423                                 Done = 1;
 424                         }
 425                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 426                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 427                 }
 428                 break;
 429         case 4:
 430                 text_to_server(bstr("g_input"));
 431                 serv_puts("000");
 432                 break;
 433         case 6:
 434                 len = atol(&ChrPtr(Buf)[4]);
 435                 StrBuf_ServGetBLOBBuffered(Buf, len);
 436                 break;
 437         case 7:
 438                 len = atol(&ChrPtr(Buf)[4]);
 439                 junk = malloc(len);
 440                 memset(junk, 0, len);
 441                 serv_write(junk, len);
 442                 free(junk);
 443         }
 444
 445         end_ajax_response();
 446
 447         /*
 448          * This is kind of an ugly hack, but this is the only place it can go.
 449          * If the command was GEXP, then the instant messenger window must be
 450          * running, so reset the "last_pager_check" watchdog timer so
 451          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 452          */
 453         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 454                 WCC->last_pager_check = time(NULL);
 455         }
 456         FreeStrBuf(&Buf);
 457 }
 458
 459
 460 /*
 461  * Helper function for the asynchronous check to see if we need
 462  * to open the instant messenger window.
 463  */
 464 void seconds_since_last_gexp(void)
 465 {
 466         char buf[256];
 467
 468         if ( (time(NULL) - WC->last_pager_check) < 30) {
 469                 wc_printf("NO\n");
 470         }
 471         else {
 472                 memset(buf, 0, 5);
 473                 serv_puts("NOOP");
 474                 serv_getln(buf, sizeof buf);
 475                 if (buf[3] == '*') {
 476                         wc_printf("YES");
 477                 }
 478                 else {
 479                         wc_printf("NO");
 480                 }
 481         }
 482 }
 483
 484
 485 /*
 486  * Save a URL destination so we can go to it later
 487  */
 488 void push_destination(void) {
 489         wcsession *WCC = WC;
 490
 491         if (!WCC) {
 492                 wc_printf("no session");
 493                 return;
 494         }
 495
 496         FreeStrBuf(&WCC->PushedDestination);
 497         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 498         syslog(9, "Push: %s", ChrPtr(WCC->PushedDestination));
 499         wc_printf("OK");
 500 }
 501
 502
 503 /*
 504  * Go to the URL saved by push_destination()
 505  */
 506 void pop_destination(void) {
 507         wcsession *WCC = WC;
 508
 509         /*
 510          * If we are in the middle of a new user signup, the server may request that
 511          * we first pass through a registration screen.
 512          */
 513         if ((WCC) && (WCC->need_regi)) {
 514                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 515                         /* Registering will take us to the My Citadel Config room, so save our place */
 516                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 517                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 518                 }
 519                 WCC->need_regi = 0;
 520                 display_reg(1);
 521                 return;
 522         }
 523
 524         /*
 525          * Do something reasonable if we somehow ended up requesting a pop without
 526          * having first done a push.
 527          */
 528         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 529                 do_welcome();
 530                 return;
 531         }
 532
 533         /*
 534          * All righty then!  We have a destination saved, so go there now.
 535          */
 536         syslog(9, "Pop: %s", ChrPtr(WCC->PushedDestination));
 537         http_redirect(ChrPtr(WCC->PushedDestination));
 538 }
 539
 540
 541
 542 int ReadPostData(void)
 543 {
 544         int rc;
 545         int urlencoded_post = 0;
 546         wcsession *WCC = WC;
 547         StrBuf *content = NULL;
 548
 549         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 550
 551         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 552
 553         if (!urlencoded_post)
 554         {
 555                 StrBufPrintf(content,
 556                      "Content-type: %s\n"
 557                              "Content-length: %ld\n\n",
 558                              ChrPtr(WCC->Hdr->HR.ContentType),
 559                              WCC->Hdr->HR.ContentLength);
 560         }
 561
 562         /** Read the entire input data at once. */
 563         rc = client_read_to(WCC->Hdr, content,
 564                             WCC->Hdr->HR.ContentLength,
 565                             SLEEPING);
 566         if (rc < 0)
 567                 return rc;
 568
 569
 570         if (urlencoded_post) {
 571                 ParseURLParams(content);
 572         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 573                 char *Buf;
 574                 char *BufEnd;
 575                 long len;
 576
 577                 len = StrLength(content);
 578                 Buf = SmashStrBuf(&content);
 579                 BufEnd = Buf + len;
 580                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 581                 free(Buf);
 582         } else if (WCC->Hdr->HR.ContentLength > 0) {
 583                 WCC->upload = content;
 584                 WCC->upload_length = StrLength(WCC->upload);
 585                 content = NULL;
 586         }
 587         FreeStrBuf(&content);
 588         return 1;
 589 }
 590
 591
 592 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 593 {
 594         long Depth, IsDepth;
 595         long offset = 0;
 596         wcsession *WCC = WC;
 597
 598         if (WCC->Hdr->HR.Handler != NULL)
 599                 offset ++;
 600         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 601         IsDepth = GetCount(WCC->Directory) + offset;
 602
 603 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 604         if (Depth < 0) {
 605                 Depth = -Depth;
 606                 return IsDepth > Depth;
 607         }
 608         else
 609                 return Depth == IsDepth;
 610 }
 611
 612
 613
 614 /*
 615  * Entry point for WebCit transaction
 616  */
 617 void session_loop(void)
 618 {
 619         int xhttp;
 620         StrBuf *Buf;
 621
 622         /*
 623          * We stuff these with the values coming from the client cookies,
 624          * so we can use them to reconnect a timed out session if we have to.
 625          */
 626         wcsession *WCC;
 627
 628         WCC= WC;
 629         WCC->upload_length = 0;
 630         WCC->upload = NULL;
 631         WCC->Hdr->nWildfireHeaders = 0;
 632
 633         if (WCC->Hdr->HR.ContentLength > 0) {
 634                 if (ReadPostData() < 0) {
 635                         return;
 636                 }
 637         }
 638
 639         Buf = NewStrBuf();
 640         WCC->trailing_javascript = NewStrBuf();
 641
 642         /* Convert base64-encoded URL's back to plain text */
 643         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 644                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 645                 StrBufDecodeBase64(WCC->Hdr->this_page);
 646                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 647                 goto SKIP_ALL_THIS_CRAP;
 648         }
 649
 650         /* If there are variables in the URL, we must grab them now */
 651         if (WCC->Hdr->PlainArgs != NULL)
 652                 ParseURLParams(WCC->Hdr->PlainArgs);
 653
 654         /* If the client sent a nonce that is incorrect, kill the request. */
 655         if (havebstr("nonce")) {
 656                 syslog(9, "Comparing supplied nonce %s to session nonce %d",
 657                         bstr("nonce"), WCC->nonce
 658                 );
 659                 if (ibstr("nonce") != WCC->nonce) {
 660                         syslog(9, "Ignoring request with mismatched nonce.");
 661                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 662                         hprintf("Content-Type: text/plain\r\n");
 663                         begin_burst();
 664                         wc_printf("Security check failed.\r\n");
 665                         end_burst();
 666                         goto SKIP_ALL_THIS_CRAP;
 667                 }
 668         }
 669
 670         /*
 671          * If we're not connected to a Citadel server, try to hook up the connection now.
 672          */
 673         if (!WCC->connected) {
 674                 if (GetConnected()) {
 675                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 676                         hprintf("Content-Type: text/html\r\n");
 677                         begin_burst();
 678                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 679                         wc_printf(_("This program was unable to connect or stay "
 680                                 "connected to the Citadel server.  Please report "
 681                                 "this problem to your system administrator.")
 682                         );
 683                         wc_printf("<br>");
 684                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 685                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 686                                 _("Read More...")
 687                         );
 688                         wc_printf("</body></html>\n");
 689                         end_burst();
 690                         goto SKIP_ALL_THIS_CRAP;
 691                 }
 692         }
 693
 694         /*
 695          * If we're not logged in, but we have authentication data (either from
 696          * a cookie or from http-auth), try logging in to Citadel using that.
 697          */
 698         if (    (!WCC->logged_in)
 699                 && (StrLength(WCC->Hdr->c_username) > 0)
 700                 && (StrLength(WCC->Hdr->c_password) > 0)
 701         ) {
 702                 long Status;
 703
 704                 FlushStrBuf(Buf);
 705                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 706                 StrBuf_ServGetln(Buf);
 707                 if (GetServerStatus(Buf, &Status) == 3) {
 708                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 709                         StrBuf_ServGetln(Buf);
 710                         if (GetServerStatus(Buf, NULL) == 2) {
 711                                 become_logged_in(WCC->Hdr->c_username,
 712                                                  WCC->Hdr->c_password, Buf);
 713                         } else {
 714                                 /* Should only display when password is wrong */
 715                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 716                                 authorization_required();
 717                                 FreeStrBuf(&Buf);
 718                                 goto SKIP_ALL_THIS_CRAP;
 719                         }
 720                 }
 721                 else if (Status == 541) {
 722                         WCC->logged_in = 1;
 723                 }
 724         }
 725
 726         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 727                 (WCC->Hdr->HR.eReqType != ePOST) &&
 728                 (WCC->Hdr->HR.eReqType != eHEAD);
 729
 730         /*
 731          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 732          * prior to doing anything else.
 733          */
 734         if (havebstr("go")) {
 735                 int ret;
 736                 syslog(9, "Explicit room selection: %s", bstr("go"));
 737                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 738                 if ((ret/100) != 2) {
 739                         syslog(1, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 740                 }
 741         }
 742         else if (havebstr("gotofirst")) {
 743                 int ret;
 744                 syslog(9, "Explicit room selection: %s", bstr("gotofirst"));
 745                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 746                 if ((ret/100) != 2) {
 747                         syslog(1, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 748                 }
 749         }
 750
 751         /*
 752          * If we aren't in any room yet, but we have cookie data telling us where we're
 753          * supposed to be, and 'go' was not specified, then go there.
 754          */
 755         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 756                 int ret;
 757
 758                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...",
 759                         ChrPtr(WCC->CurRoom.name),
 760                         ChrPtr(WCC->Hdr->c_roomname)
 761                 );
 762                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 763                 if ((ret/100) != 2) {
 764                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 765                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 766                 }
 767         }
 768
 769         if (WCC->Hdr->HR.Handler != NULL) {
 770                 if (    (!WCC->logged_in)
 771                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 772                         && (WCC->serv_info->serv_supports_guest == 0)
 773                 ) {
 774                         display_login();
 775                 }
 776                 else {
 777                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 778                                 begin_ajax_response();
 779                         }
 780                         WCC->Hdr->HR.Handler->F();
 781                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 782                                 end_ajax_response();
 783                         }
 784                 }
 785         }
 786         /* When all else fails, display the default landing page or a main menu. */
 787         else {
 788                 /*
 789                  * ordinary browser users get a nice login screen, DAV etc. requsets
 790                  * are given a 401 so they can handle it appropriate.
 791                  */
 792                 if (!WCC->logged_in)  {
 793                         if (xhttp) {
 794                                 authorization_required();
 795                         }
 796                         else {
 797                                 display_default_landing_page();
 798                         }
 799                 }
 800                 /*
 801                  * Toplevel dav requests? or just a flat browser request?
 802                  */
 803                 else {
 804                         if (xhttp) {
 805                                 dav_main();
 806                         }
 807                         else {
 808                                 display_main_menu();
 809                         }
 810                 }
 811         }
 812
 813 SKIP_ALL_THIS_CRAP:
 814         FreeStrBuf(&Buf);
 815         fflush(stdout);
 816 }
 817
 818
 819
 820 /*
 821  * Display the appropriate landing page for this site.
 822  */
 823 void display_default_landing_page(void) {
 824         wcsession *WCC = WC;
 825
 826         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 827                 /* default action */
 828
 829                 if (default_landing_page) {
 830                         http_redirect(default_landing_page);
 831                 }
 832                 else {
 833                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 834                         smart_goto(teh_lobby);
 835                         FreeStrBuf(&teh_lobby);
 836                 }
 837         }
 838         else {
 839                 display_login();
 840         }
 841 }
 842
 843
 844 /*
 845  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 846  */
 847 void sleeeeeeeeeep(int seconds)
 848 {
 849         struct timeval tv;
 850
 851         tv.tv_sec = seconds;
 852         tv.tv_usec = 0;
 853         select(0, NULL, NULL, NULL, &tv);
 854 }
 855
 856 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 857 {
 858         return is_https != 0;
 859 }
 860
 861 void AppendImportantMessage(const char *pch, long len)
 862 {
 863         wcsession *WCC = WC;
 864
 865         if (StrLength(WCC->ImportantMsg) > 0) {
 866                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 867         }
 868
 869         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 870 }
 871
 872 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 873 {
 874         wcsession *WCC = WC;
 875         if (WCC != NULL)
 876                 return (StrLength(WCC->ImportantMsg) > 0);
 877         else
 878                 return 0;
 879 }
 880
 881 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 882 {
 883         wcsession *WCC = WC;
 884
 885         if (WCC != NULL) {
 886                 if (StrLength(WCC->ImportantMsg) > 0) {
 887                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 888                         FlushStrBuf(WCC->ImportantMsg);
 889                 }
 890         }
 891 }
 892
 893 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 894 {
 895         wcsession *WCC = WC;
 896
 897         if (WCC != NULL)
 898                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 899 }
 900
 901 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 902 {
 903         StrBufAppendBuf(Target,
 904                         csslocal, 0);
 905 }
 906
 907 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 908 {
 909         StrBufAppendBufPlain(Target,
 910                              HKEY(PACKAGE_STRING), 0);
 911 }
 912
 913 extern char static_local_dir[PATH_MAX];
 914
 915
 916 void
 917 InitModule_WEBCIT
 918 (void)
 919 {
 920         char dir[SIZ];
 921         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 922         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 923         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 924         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 925         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 926         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 927         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 928
 929         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 930         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 931         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 932         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 933
 934         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 935         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 936         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 937         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 938         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 939
 940
 941         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 942         if (!access(dir, R_OK)) {
 943                 syslog(9, "Using local Stylesheet [%s]", dir);
 944                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 945         }
 946         else
 947                 syslog(9, "No Site-local Stylesheet [%s] installed.", dir);
 948
 949 }
 950
 951 void
 952 ServerStartModule_WEBCIT
 953 (void)
 954 {
 955         HandlerHash = NewHash(1, NULL);
 956 }
 957
 958
 959 void
 960 ServerShutdownModule_WEBCIT
 961 (void)
 962 {
 963         FreeStrBuf(&csslocal);
 964         DeleteHash(&HandlerHash);
 965 }
 966
 967
 968
 969 void
 970 SessionNewModule_WEBCIT
 971 (wcsession *sess)
 972 {
 973         sess->ImportantMsg = NewStrBuf();
 974         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 975         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 976 }
 977
 978 void
 979 SessionDetachModule_WEBCIT
 980 (wcsession *sess)
 981 {
 982         DeleteHash(&sess->Directory);
 983
 984         FreeStrBuf(&sess->upload);
 985         sess->upload_length = 0;
 986
 987         FreeStrBuf(&sess->trailing_javascript);
 988
 989         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
 990         {
 991                 FreeStrBuf(&sess->WBuf);
 992                 sess->WBuf = NewStrBuf();
 993         }
 994         else
 995                 FlushStrBuf(sess->WBuf);
 996         FlushStrBuf(sess->HBuf);
 997 }
 998
 999 void
1000 SessionDestroyModule_WEBCIT
1001 (wcsession *sess)
1002 {
1003         FreeStrBuf(&sess->WBuf);
1004         FreeStrBuf(&sess->HBuf);
1005         FreeStrBuf(&sess->ImportantMsg);
1006         FreeStrBuf(&sess->PushedDestination);
1007 }
1008