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 "groupdav.h"
  28 #include "webserver.h"
  29
  30 StrBuf *csslocal = NULL;
  31 HashList *HandlerHash = NULL;
  32
  33 void stuff_to_cookie(int unset_cookie);
  34 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 (!IsEmptyStr(WCC->ImportantMessage)) {
 206                         wc_printf("<div id=\"important_message\">\n"
 207                                 "<span class=\"imsg\">");
 208                         StrEscAppend(WCC->WBuf, NULL, WCC->ImportantMessage, 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                         WCC->ImportantMessage[0] = 0;
 217                 }
 218                 else if (StrLength(WCC->ImportantMsg) > 0) {
 219                         wc_printf("<div id=\"important_message\">\n"
 220                                 "<span class=\"imsg\">");
 221                         StrEscAppend(WCC->WBuf, WCC->ImportantMsg, NULL, 0, 0);
 222                         wc_printf("</span><br>\n"
 223                                 "</div>\n"
 224                         );
 225                         StrBufAppendBufPlain(WCC->trailing_javascript,
 226                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 227                                              0
 228                         );
 229                         FlushStrBuf(WCC->ImportantMsg);
 230                 }
 231                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 232                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 233                 }
 234
 235                 if (do_room_banner == 1) {
 236                         tmplput_roombanner(NULL, NULL);
 237                 }
 238         }
 239
 240         if (do_room_banner == 1) {
 241                 wc_printf("<div id=\"content\">\n");
 242         }
 243 }
 244
 245 void output_custom_content_header(const char *ctype) {
 246   hprintf("HTTP/1.1 200 OK\r\n");
 247   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 248   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 249   hprintf("Connection: close\r\n");
 250 }
 251
 252
 253 /*
 254  * Generic function to do an HTTP redirect.  Easy and fun.
 255  */
 256 void http_redirect(const char *whichpage) {
 257         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 258         hprintf("Location: %s\r\n", whichpage);
 259         hprintf("URI: %s\r\n", whichpage);
 260         hprintf("Content-type: text/html; charset=utf-8\r\n");
 261         begin_burst();
 262         wc_printf("<html><body>");
 263         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 264         wc_printf("</body></html>\n");
 265         end_burst();
 266 }
 267
 268
 269
 270 /*
 271  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 272  */
 273 void http_transmit_thing(const char *content_type, int is_static)
 274 {
 275
 276         syslog(9, "http_transmit_thing(%s)%s\n", content_type, ((is_static > 0) ? " (static)" : ""));
 277         output_headers(0, 0, 0, 0, 0, is_static);
 278
 279         hprintf("Content-type: %s\r\n"
 280                 "Server: %s\r\n"
 281                 "Connection: close\r\n",
 282                 content_type,
 283                 PACKAGE_STRING);
 284
 285         end_burst();
 286 }
 287
 288
 289 /*
 290  * Convenience functions to display a page containing only a string
 291  *
 292  * titlebarcolor        color of the titlebar of the frame
 293  * titlebarmsg          text to display in the title bar
 294  * messagetext          body of the box
 295  */
 296 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 297 {
 298         hprintf("HTTP/1.1 200 OK\n");
 299         output_headers(1, 1, 2, 0, 0, 0);
 300         wc_printf("<div id=\"banner\">\n");
 301         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 302         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 303         wc_printf("</td></tr></table>\n");
 304         wc_printf("</div>\n<div id=\"content\">\n");
 305         escputs(messagetext);
 306
 307         wc_printf("<hr />\n");
 308         wDumpContent(1);
 309 }
 310
 311
 312 /*
 313  * Display a blank page.
 314  */
 315 void blank_page(void) {
 316         output_headers(1, 1, 0, 0, 0, 0);
 317         wDumpContent(2);
 318 }
 319
 320
 321 /*
 322  * A template has been requested
 323  */
 324 void url_do_template(void) {
 325         const StrBuf *MimeType;
 326         const StrBuf *Tmpl = sbstr("template");
 327         begin_burst();
 328         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 329         http_transmit_thing(ChrPtr(MimeType), 0);
 330 }
 331
 332
 333
 334 /*
 335  * convenience function to indicate success
 336  */
 337 void display_success(char *successmessage)
 338 {
 339         convenience_page("007700", "OK", successmessage);
 340 }
 341
 342
 343 /*
 344  * Authorization required page (sends a 401, causing the browser to request login credentials)
 345  */
 346 void authorization_required(void)
 347 {
 348         wcsession *WCC = WC;
 349         const char *message = "";
 350
 351         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 352         hprintf(
 353                 "Server: %s / %s\r\n"
 354                 "Connection: close\r\n",
 355                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 356         );
 357         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 358         hprintf("Content-Type: text/html\r\n");
 359         begin_burst();
 360         wc_printf("<h1>");
 361         wc_printf(_("Authorization Required"));
 362         wc_printf("</h1>\r\n");
 363
 364
 365         if (WCC->ImportantMsg != NULL)
 366                 message = ChrPtr(WCC->ImportantMsg);
 367         else if (WCC->ImportantMessage != NULL)
 368                 message = WCC->ImportantMessage;
 369
 370         wc_printf(_("The resource you requested requires a valid username and password. "
 371                 "You could not be logged in: %s\n"), message);
 372         wDumpContent(0);
 373         end_webcit_session();
 374 }
 375
 376 /*
 377  * Convenience functions to wrap around asynchronous ajax responses
 378  */
 379 void begin_ajax_response(void) {
 380         wcsession *WCC = WC;
 381
 382         FlushStrBuf(WCC->HBuf);
 383         output_headers(0, 0, 0, 0, 0, 0);
 384
 385         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 386                 "Server: %s\r\n"
 387                 "Connection: close\r\n"
 388                 ,
 389                 PACKAGE_STRING);
 390         begin_burst();
 391 }
 392
 393 /*
 394  * print ajax response footer
 395  */
 396 void end_ajax_response(void) {
 397         wDumpContent(0);
 398 }
 399
 400
 401
 402 /*
 403  * Wraps a Citadel server command in an AJAX transaction.
 404  */
 405 void ajax_servcmd(void)
 406 {
 407         wcsession *WCC = WC;
 408         int Done = 0;
 409         StrBuf *Buf;
 410         char *junk;
 411         size_t len;
 412
 413         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"\n", bstr("g_cmd") );
 414         begin_ajax_response();
 415         Buf = NewStrBuf();
 416         serv_puts(bstr("g_cmd"));
 417         StrBuf_ServGetln(Buf);
 418         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 419         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 420
 421         switch (GetServerStatus(Buf, NULL)) {
 422         case 8:
 423                 serv_puts("\n\n000");
 424                 if ( (StrLength(Buf)==3) &&
 425                      !strcmp(ChrPtr(Buf), "000")) {
 426                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 427                         break;
 428                 }
 429         case 1:
 430                 while (!Done) {
 431                         if (StrBuf_ServGetln(Buf) < 0)
 432                                 break;
 433                         if ( (StrLength(Buf)==3) &&
 434                              !strcmp(ChrPtr(Buf), "000")) {
 435                                 Done = 1;
 436                         }
 437                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 438                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 439                 }
 440                 break;
 441         case 4:
 442                 text_to_server(bstr("g_input"));
 443                 serv_puts("000");
 444                 break;
 445         case 6:
 446                 len = atol(&ChrPtr(Buf)[4]);
 447                 StrBuf_ServGetBLOBBuffered(Buf, len);
 448                 break;
 449         case 7:
 450                 len = atol(&ChrPtr(Buf)[4]);
 451                 junk = malloc(len);
 452                 memset(junk, 0, len);
 453                 serv_write(junk, len);
 454                 free(junk);
 455         }
 456
 457         end_ajax_response();
 458
 459         /*
 460          * This is kind of an ugly hack, but this is the only place it can go.
 461          * If the command was GEXP, then the instant messenger window must be
 462          * running, so reset the "last_pager_check" watchdog timer so
 463          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 464          */
 465         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 466                 WCC->last_pager_check = time(NULL);
 467         }
 468         FreeStrBuf(&Buf);
 469 }
 470
 471
 472 /*
 473  * Helper function for the asynchronous check to see if we need
 474  * to open the instant messenger window.
 475  */
 476 void seconds_since_last_gexp(void)
 477 {
 478         char buf[256];
 479
 480         if ( (time(NULL) - WC->last_pager_check) < 30) {
 481                 wc_printf("NO\n");
 482         }
 483         else {
 484                 memset(buf, 0, 5);
 485                 serv_puts("NOOP");
 486                 serv_getln(buf, sizeof buf);
 487                 if (buf[3] == '*') {
 488                         wc_printf("YES");
 489                 }
 490                 else {
 491                         wc_printf("NO");
 492                 }
 493         }
 494 }
 495
 496
 497 /*
 498  * Save a URL destination so we can go to it later
 499  */
 500 void push_destination(void) {
 501         wcsession *WCC = WC;
 502
 503         if (!WCC) {
 504                 wc_printf("no session");
 505                 return;
 506         }
 507
 508         FreeStrBuf(&WCC->PushedDestination);
 509         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 510         syslog(9, "Push: %s\n", ChrPtr(WCC->PushedDestination));
 511         wc_printf("OK");
 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         syslog(9, "Pop: %s\n", ChrPtr(WCC->PushedDestination));
 548         http_redirect(ChrPtr(WCC->PushedDestination));
 549 }
 550
 551
 552
 553 int ReadPostData(void)
 554 {
 555         int rc;
 556         int urlencoded_post = 0;
 557         wcsession *WCC = WC;
 558         StrBuf *content = NULL;
 559
 560         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 561
 562         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 563
 564         if (!urlencoded_post)
 565         {
 566                 StrBufPrintf(content,
 567                      "Content-type: %s\n"
 568                              "Content-length: %ld\n\n",
 569                              ChrPtr(WCC->Hdr->HR.ContentType),
 570                              WCC->Hdr->HR.ContentLength);
 571         }
 572
 573         /** Read the entire input data at once. */
 574         rc = client_read_to(WCC->Hdr, content,
 575                             WCC->Hdr->HR.ContentLength,
 576                             SLEEPING);
 577         if (rc < 0)
 578                 return rc;
 579
 580
 581         if (urlencoded_post) {
 582                 ParseURLParams(content);
 583         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 584                 char *Buf;
 585                 char *BufEnd;
 586                 long len;
 587
 588                 len = StrLength(content);
 589                 Buf = SmashStrBuf(&content);
 590                 BufEnd = Buf + len;
 591                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 592                 free(Buf);
 593         } else if (WCC->Hdr->HR.ContentLength > 0) {
 594                 WCC->upload = content;
 595                 WCC->upload_length = StrLength(WCC->upload);
 596                 content = NULL;
 597         }
 598         FreeStrBuf(&content);
 599         return 1;
 600 }
 601
 602
 603 void ParseREST_URL(void)
 604 {
 605         StrBuf *Buf;
 606         StrBuf *pFloor = NULL;
 607         wcsession *WCC = WC;
 608         long i = 0;
 609         const char *pCh = NULL;
 610         HashList *Floors;
 611         void *vFloor;
 612
 613         syslog(1, "parsing rest URL: %s\n", ChrPtr(WCC->Hdr->HR.ReqLine));
 614
 615         WCC->Directory = NewHash(1, Flathash);
 616         WCC->CurrentFloor = NULL;
 617
 618         Buf = NewStrBuf();
 619         while (StrBufExtract_NextToken(Buf, WCC->Hdr->HR.ReqLine, &pCh,  '/') >= 0)
 620         {
 621                 if (StrLength(Buf) != 0) {
 622                         /* ignore empty path segments */
 623                         StrBufUnescape(Buf, 1);
 624                         Put(WCC->Directory, IKEY(i), Buf, HFreeStrBuf);
 625                         if (i==0)
 626                                 pFloor = Buf;
 627                         Buf = NewStrBuf();
 628                 }
 629                 i++;
 630         }
 631
 632         FreeStrBuf(&Buf);
 633         if (pFloor != NULL)
 634         {
 635                 Floors = GetFloorListHash(NULL, NULL);
 636
 637                 if (Floors != NULL)
 638                 {
 639                         if (GetHash(WCC->FloorsByName, SKEY(pFloor), &vFloor))
 640                                 WCC->CurrentFloor = (Floor*) vFloor;
 641                 }
 642         }
 643 }
 644
 645 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 646 {
 647         long Depth, IsDepth;
 648         long offset = 0;
 649         wcsession *WCC = WC;
 650
 651         if (WCC->Hdr->HR.Handler != NULL)
 652                 offset ++;
 653         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 654         IsDepth = GetCount(WCC->Directory) + offset;
 655
 656 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 657         if (Depth < 0) {
 658                 Depth = -Depth;
 659                 return IsDepth > Depth;
 660         }
 661         else
 662                 return Depth == IsDepth;
 663 }
 664
 665
 666
 667 /*
 668  * Entry point for WebCit transaction
 669  */
 670 void session_loop(void)
 671 {
 672         int Flags = 0;
 673         int xhttp;
 674         StrBuf *Buf;
 675
 676         /*
 677          * We stuff these with the values coming from the client cookies,
 678          * so we can use them to reconnect a timed out session if we have to.
 679          */
 680         wcsession *WCC;
 681
 682         WCC= WC;
 683         WCC->upload_length = 0;
 684         WCC->upload = NULL;
 685         WCC->Hdr->nWildfireHeaders = 0;
 686         if (WCC->Hdr->HR.Handler != NULL)
 687                 Flags = WCC->Hdr->HR.Handler->Flags; /* so we can temporarily add our own... */
 688
 689         if (WCC->Hdr->HR.ContentLength > 0) {
 690                 if (ReadPostData() < 0) {
 691                         return;
 692                 }
 693         }
 694
 695         Buf = NewStrBuf();
 696         WCC->trailing_javascript = NewStrBuf();
 697
 698         /* Convert base64-encoded URL's back to plain text */
 699         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 700                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 701                 StrBufDecodeBase64(WCC->Hdr->this_page);
 702                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 703                 goto SKIP_ALL_THIS_CRAP;
 704         }
 705
 706         /* If there are variables in the URL, we must grab them now */
 707         if (WCC->Hdr->PlainArgs != NULL)
 708                 ParseURLParams(WCC->Hdr->PlainArgs);
 709
 710         /* If the client sent a nonce that is incorrect, kill the request. */
 711         if (havebstr("nonce")) {
 712                 syslog(9, "Comparing supplied nonce %s to session nonce %d\n",
 713                         bstr("nonce"), WCC->nonce
 714                 );
 715                 if (ibstr("nonce") != WCC->nonce) {
 716                         syslog(9, "Ignoring request with mismatched nonce.\n");
 717                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 718                         hprintf("Content-Type: text/plain\r\n");
 719                         begin_burst();
 720                         wc_printf("Security check failed.\r\n");
 721                         end_burst();
 722                         goto SKIP_ALL_THIS_CRAP;
 723                 }
 724         }
 725
 726         /*
 727          * If we're not connected to a Citadel server, try to hook up the connection now.
 728          */
 729         if (!WCC->connected) {
 730                 if (GetConnected()) {
 731                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 732                         hprintf("Content-Type: text/html\r\n");
 733                         begin_burst();
 734                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 735                         wc_printf(_("This program was unable to connect or stay "
 736                                 "connected to the Citadel server.  Please report "
 737                                 "this problem to your system administrator.")
 738                         );
 739                         wc_printf("<br>");
 740                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 741                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 742                                 _("Read More...")
 743                         );
 744                         wc_printf("</body></html>\n");
 745                         end_burst();
 746                         goto SKIP_ALL_THIS_CRAP;
 747                 }
 748         }
 749
 750         /*
 751          * If we're not logged in, but we have authentication data (either from
 752          * a cookie or from http-auth), try logging in to Citadel using that.
 753          */
 754         if ((!WCC->logged_in)
 755             && (StrLength(WCC->Hdr->c_username) > 0)
 756             && (StrLength(WCC->Hdr->c_password) > 0))
 757         {
 758                 long Status;
 759
 760                 FlushStrBuf(Buf);
 761                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 762                 StrBuf_ServGetln(Buf);
 763                 if (GetServerStatus(Buf, &Status) == 3) {
 764                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 765                         StrBuf_ServGetln(Buf);
 766                         if (GetServerStatus(Buf, NULL) == 2) {
 767                                 become_logged_in(WCC->Hdr->c_username,
 768                                                  WCC->Hdr->c_password, Buf);
 769                         } else {
 770                                 /* Should only display when password is wrong */
 771                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 772                                 authorization_required();
 773                                 FreeStrBuf(&Buf);
 774                                 goto SKIP_ALL_THIS_CRAP;
 775                         }
 776                 }
 777                 else if (Status == 541) {
 778                         WCC->logged_in = 1;
 779                 }
 780         }
 781
 782         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 783                 (WCC->Hdr->HR.eReqType != ePOST) &&
 784                 (WCC->Hdr->HR.eReqType != eHEAD);
 785
 786         /*
 787          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 788          * prior to doing anything else.
 789          */
 790         if (havebstr("go")) {
 791                 int ret;
 792                 syslog(9, "Explicit room selection: %s\n", bstr("go"));
 793                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 794                 if ((ret/100) != 2) {
 795                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("go"), ret);
 796                 }
 797         }
 798         else if (havebstr("gotofirst")) {
 799                 int ret;
 800                 syslog(9, "Explicit room selection: %s\n", bstr("gotofirst"));
 801                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 802                 if ((ret/100) != 2) {
 803                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("gotofirst"), ret);
 804                 }
 805         }
 806
 807         /*
 808          * If we aren't in any room yet, but we have cookie data telling us where we're
 809          * supposed to be, and 'go' was not specified, then go there.
 810          */
 811         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 812                 int ret;
 813
 814                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...\n",
 815                         ChrPtr(WCC->CurRoom.name),
 816                         ChrPtr(WCC->Hdr->c_roomname)
 817                 );
 818                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 819                 if ((ret/100) != 2) {
 820                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d\n",
 821                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 822                 }
 823         }
 824
 825         if (WCC->Hdr->HR.Handler != NULL) {
 826                 if (    (!WCC->logged_in)
 827                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 828                         && (WCC->serv_info->serv_supports_guest == 0)
 829                 ) {
 830                         display_login();
 831                 }
 832                 else {
 833 /*
 834                         if ((WCC->Hdr->HR.Handler->Flags & PARSE_REST_URL) != 0)
 835                                 ParseREST_URL();
 836 */
 837                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 838                                 begin_ajax_response();
 839                         WCC->Hdr->HR.Handler->F();
 840                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 841                                 end_ajax_response();
 842                 }
 843         }
 844         /* When all else fails, display the default landing page or a main menu. */
 845         else {
 846                 /*
 847                  * ordinary browser users get a nice login screen, DAV etc. requsets
 848                  * are given a 401 so they can handle it appropriate.
 849                  */
 850                 if (!WCC->logged_in)  {
 851                         if (xhttp) {
 852                                 authorization_required();
 853                         }
 854                         else {
 855                                 display_default_landing_page();
 856                         }
 857                 }
 858                 /*
 859                  * Toplevel dav requests? or just a flat browser request?
 860                  */
 861                 else {
 862                         if (xhttp)
 863                                 groupdav_main();
 864                         else
 865                                 display_main_menu();
 866                 }
 867         }
 868
 869 SKIP_ALL_THIS_CRAP:
 870         FreeStrBuf(&Buf);
 871         fflush(stdout);
 872 }
 873
 874
 875
 876 /*
 877  * Display the appropriate landing page for this site.
 878  */
 879 void display_default_landing_page(void) {
 880         wcsession *WCC = WC;
 881
 882         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 883                 /* default action */
 884
 885                 if (default_landing_page) {
 886                         http_redirect(default_landing_page);
 887                 }
 888                 else {
 889                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 890                         smart_goto(teh_lobby);
 891                         FreeStrBuf(&teh_lobby);
 892                 }
 893         }
 894         else {
 895                 display_login();
 896         }
 897 }
 898
 899
 900 /*
 901  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 902  */
 903 void sleeeeeeeeeep(int seconds)
 904 {
 905         struct timeval tv;
 906
 907         tv.tv_sec = seconds;
 908         tv.tv_usec = 0;
 909         select(0, NULL, NULL, NULL, &tv);
 910 }
 911
 912 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 913 {
 914         return is_https != 0;
 915 }
 916
 917 void AppendImportantMessage(const char *pch, long len)
 918 {
 919         wcsession *WCC = WC;
 920
 921         if (StrLength(WCC->ImportantMsg) > 0) {
 922                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 923         }
 924
 925         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 926 }
 927
 928 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 929 {
 930         wcsession *WCC = WC;
 931         if (WCC != NULL)
 932                 return ((!IsEmptyStr(WCC->ImportantMessage)) ||
 933                         (StrLength(WCC->ImportantMsg) > 0));
 934         else
 935                 return 0;
 936 }
 937
 938 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 939 {
 940         wcsession *WCC = WC;
 941
 942         if (WCC != NULL) {
 943                 if (!IsEmptyStr(WCC->ImportantMessage)) {
 944                         StrEscAppend(Target, NULL, WCC->ImportantMessage, 0, 0);
 945                         WCC->ImportantMessage[0] = '\0';
 946                 }
 947                 else if (StrLength(WCC->ImportantMsg) > 0) {
 948                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 949                         FlushStrBuf(WCC->ImportantMsg);
 950                 }
 951         }
 952 }
 953
 954 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 955 {
 956         wcsession *WCC = WC;
 957
 958         if (WCC != NULL)
 959                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 960 }
 961
 962 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 963 {
 964         StrBufAppendBuf(Target,
 965                         csslocal, 0);
 966 }
 967
 968 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 969 {
 970         StrBufAppendBufPlain(Target,
 971                              HKEY(PACKAGE_STRING), 0);
 972 }
 973
 974 extern char static_local_dir[PATH_MAX];
 975
 976
 977 void
 978 InitModule_WEBCIT
 979 (void)
 980 {
 981         char dir[SIZ];
 982         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 983         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 984         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 985         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 986         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 987         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 988         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 989
 990         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 991         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 992         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 993         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 994
 995         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 996         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 997         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 998         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 999         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
1000
1001
1002         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
1003         if (!access(dir, R_OK)) {
1004                 syslog(9, "Using local Stylesheet [%s]\n", dir);
1005                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
1006         }
1007         else
1008                 syslog(9, "No Site-local Stylesheet [%s] installed. \n", dir);
1009
1010 }
1011
1012 void
1013 ServerStartModule_WEBCIT
1014 (void)
1015 {
1016         HandlerHash = NewHash(1, NULL);
1017 }
1018
1019
1020 void
1021 ServerShutdownModule_WEBCIT
1022 (void)
1023 {
1024         FreeStrBuf(&csslocal);
1025         DeleteHash(&HandlerHash);
1026 }
1027
1028
1029
1030 void
1031 SessionNewModule_WEBCIT
1032 (wcsession *sess)
1033 {
1034         sess->ImportantMsg = NewStrBuf();
1035         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
1036         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
1037 }
1038
1039 void
1040 SessionDetachModule_WEBCIT
1041 (wcsession *sess)
1042 {
1043         DeleteHash(&sess->Directory);
1044
1045         FreeStrBuf(&sess->upload);
1046         sess->upload_length = 0;
1047
1048         FreeStrBuf(&sess->trailing_javascript);
1049
1050         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1051         {
1052                 FreeStrBuf(&sess->WBuf);
1053                 sess->WBuf = NewStrBuf();
1054         }
1055         else
1056                 FlushStrBuf(sess->WBuf);
1057         FlushStrBuf(sess->HBuf);
1058 }
1059
1060 void
1061 SessionDestroyModule_WEBCIT
1062 (wcsession *sess)
1063 {
1064         FreeStrBuf(&sess->WBuf);
1065         FreeStrBuf(&sess->HBuf);
1066         FreeStrBuf(&sess->ImportantMsg);
1067         FreeStrBuf(&sess->PushedDestination);
1068 }
1069