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