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 PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  34 {
  35         wcsession *WCC = WC;
  36         int n;
  37
  38         n = GetCount(WCC->Hdr->HTTPHeaders);
  39         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  40 }
  41
  42 void DeleteWebcitHandler(void *vHandler)
  43 {
  44         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  45         FreeStrBuf(&Handler->Name);
  46         FreeStrBuf(&Handler->DisplayName);
  47         free (Handler);
  48 }
  49
  50 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  51                          const char *DisplayName, long dslen,
  52                          WebcitHandlerFunc F,
  53                          long Flags)
  54 {
  55         WebcitHandler *NewHandler;
  56         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  57         NewHandler->F = F;
  58         NewHandler->Flags = Flags;
  59         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  60         StrBufShrinkToFit(NewHandler->Name, 1);
  61         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  62         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  63         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  64 }
  65
  66 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  67 {
  68         wcsession *WCC = WC;
  69         if (WCC->Hdr->HR.Handler != NULL)
  70                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  71 }
  72
  73
  74 /*
  75  * web-printing funcion. uses our vsnprintf wrapper
  76  */
  77 #ifdef UBER_VERBOSE_DEBUGGING
  78 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  79 #else
  80 void wc_printf(const char *format,...)
  81 #endif
  82 {
  83         wcsession *WCC = WC;
  84         va_list arg_ptr;
  85
  86         if (WCC->WBuf == NULL)
  87                 WCC->WBuf = NewStrBuf();
  88 #ifdef UBER_VERBOSE_DEBUGGING
  89         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  90 #endif
  91
  92         va_start(arg_ptr, format);
  93         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  94         va_end(arg_ptr);
  95 #ifdef UBER_VERBOSE_DEBUGGING
  96         StrBufAppendPrintf(WCC->WBuf, "]\n");
  97 #endif
  98 }
  99
 100 /*
 101  * http-header-printing funcion. uses our vsnprintf wrapper
 102  */
 103 void hprintf(const char *format,...)
 104 {
 105         wcsession *WCC = WC;
 106         va_list arg_ptr;
 107
 108         va_start(arg_ptr, format);
 109         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 110         va_end(arg_ptr);
 111 }
 112
 113
 114
 115 /*
 116  * wrap up an HTTP session, closes tags, etc.
 117  *
 118  * print_standard_html_footer should be set to:
 119  * 0            - to transmit only,
 120  * nonzero      - to append the closing tags
 121  */
 122 void wDumpContent(int print_standard_html_footer)
 123 {
 124         if (print_standard_html_footer) {
 125                 wc_printf("</div> <!-- end of 'content' div -->\n");
 126                 do_template("trailing");
 127         }
 128
 129         /* If we've been saving it all up for one big output burst,
 130          * go ahead and do that now.
 131          */
 132         end_burst();
 133 }
 134
 135
 136
 137
 138 /*
 139  * Output HTTP headers and leading HTML for a page
 140  */
 141 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 142                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 143
 144                         int do_room_banner,     /* 0=no, 1=yes,
 145                                                  * 2 = I'm going to embed my own, so don't open the
 146                                                  *     <div id="content"> either.
 147                                                  */
 148
 149                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 150                         int suppress_check,     /* 1 = suppress check for instant messages        */
 151                         int cache               /* 1 = allow browser to cache this page      */
 152 ) {
 153         wcsession *WCC = WC;
 154         char httpnow[128];
 155
 156         hprintf("HTTP/1.1 200 OK\n");
 157         http_datestring(httpnow, sizeof httpnow, time(NULL));
 158
 159         if (do_httpheaders) {
 160                 if (WCC->serv_info != NULL)
 161                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 162                                 "Server: %s / %s\n"
 163                                 "Connection: close\r\n",
 164                                 PACKAGE_STRING,
 165                                 ChrPtr(WCC->serv_info->serv_software));
 166                 else
 167                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 168                                 "Server: %s / [n/a]\n"
 169                                 "Connection: close\r\n",
 170                                 PACKAGE_STRING);
 171         }
 172
 173         if (cache > 0) {
 174                 char httpTomorow[128];
 175
 176                 http_datestring(httpTomorow, sizeof httpTomorow,
 177                                 time(NULL) + 60 * 60 * 24 * 2);
 178
 179                 hprintf("Pragma: public\r\n"
 180                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 181                         "Last-modified: %s\r\n"
 182                         "Expires: %s\r\n",
 183                         httpnow,
 184                         httpTomorow
 185                 );
 186         }
 187         else {
 188                 hprintf("Pragma: no-cache\r\n"
 189                         "Cache-Control: no-store\r\n"
 190                         "Expires: -1\r\n"
 191                 );
 192         }
 193
 194         if (cache < 2) stuff_to_cookie(unset_cookies);
 195
 196         if (do_htmlhead) {
 197                 begin_burst();
 198                 do_template("head");
 199
 200                 /* check for ImportantMessages (these display in a div overlaying the main screen) */
 201                 if (!IsEmptyStr(WCC->ImportantMessage)) {
 202                         wc_printf("<div id=\"important_message\">\n"
 203                                 "<span class=\"imsg\">");
 204                         StrEscAppend(WCC->WBuf, NULL, WCC->ImportantMessage, 0, 0);
 205                         wc_printf("</span><br>\n"
 206                                 "</div>\n"
 207                         );
 208                         StrBufAppendBufPlain(WCC->trailing_javascript,
 209                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 210                                              0
 211                         );
 212                         WCC->ImportantMessage[0] = 0;
 213                 }
 214                 else if (StrLength(WCC->ImportantMsg) > 0) {
 215                         wc_printf("<div id=\"important_message\">\n"
 216                                 "<span class=\"imsg\">");
 217                         StrEscAppend(WCC->WBuf, WCC->ImportantMsg, NULL, 0, 0);
 218                         wc_printf("</span><br>\n"
 219                                 "</div>\n"
 220                         );
 221                         StrBufAppendBufPlain(WCC->trailing_javascript,
 222                                              HKEY("setTimeout('hide_imsg_popup()', 5000);       \n"),
 223                                              0
 224                         );
 225                         FlushStrBuf(WCC->ImportantMsg);
 226                 }
 227                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 228                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 229                 }
 230
 231                 if (do_room_banner == 1) {
 232                         tmplput_roombanner(NULL, NULL);
 233                 }
 234         }
 235
 236         if (do_room_banner == 1) {
 237                 wc_printf("<div id=\"content\">\n");
 238         }
 239 }
 240
 241 void output_custom_content_header(const char *ctype) {
 242   hprintf("HTTP/1.1 200 OK\r\n");
 243   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 244   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 245   hprintf("Connection: close\r\n");
 246 }
 247
 248
 249 /*
 250  * Generic function to do an HTTP redirect.  Easy and fun.
 251  */
 252 void http_redirect(const char *whichpage) {
 253         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 254         hprintf("Location: %s\r\n", whichpage);
 255         hprintf("URI: %s\r\n", whichpage);
 256         hprintf("Content-type: text/html; charset=utf-8\r\n");
 257         begin_burst();
 258         wc_printf("<html><body>");
 259         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 260         wc_printf("</body></html>\n");
 261         end_burst();
 262 }
 263
 264
 265
 266 /*
 267  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 268  */
 269 void http_transmit_thing(const char *content_type, int is_static)
 270 {
 271
 272         syslog(9, "http_transmit_thing(%s)%s\n", content_type, ((is_static > 0) ? " (static)" : ""));
 273         output_headers(0, 0, 0, 0, 0, is_static);
 274
 275         hprintf("Content-type: %s\r\n"
 276                 "Server: %s\r\n"
 277                 "Connection: close\r\n",
 278                 content_type,
 279                 PACKAGE_STRING);
 280
 281         end_burst();
 282 }
 283
 284
 285 /*
 286  * Convenience functions to display a page containing only a string
 287  *
 288  * titlebarcolor        color of the titlebar of the frame
 289  * titlebarmsg          text to display in the title bar
 290  * messagetext          body of the box
 291  */
 292 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 293 {
 294         hprintf("HTTP/1.1 200 OK\n");
 295         output_headers(1, 1, 2, 0, 0, 0);
 296         wc_printf("<div id=\"banner\">\n");
 297         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 298         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 299         wc_printf("</td></tr></table>\n");
 300         wc_printf("</div>\n<div id=\"content\">\n");
 301         escputs(messagetext);
 302
 303         wc_printf("<hr />\n");
 304         wDumpContent(1);
 305 }
 306
 307
 308 /*
 309  * Display a blank page.
 310  */
 311 void blank_page(void) {
 312         output_headers(1, 1, 0, 0, 0, 0);
 313         wDumpContent(2);
 314 }
 315
 316
 317 /*
 318  * A template has been requested
 319  */
 320 void url_do_template(void) {
 321         const StrBuf *MimeType;
 322         const StrBuf *Tmpl = sbstr("template");
 323         begin_burst();
 324         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 325         http_transmit_thing(ChrPtr(MimeType), 0);
 326 }
 327
 328
 329
 330 /*
 331  * convenience function to indicate success
 332  */
 333 void display_success(char *successmessage)
 334 {
 335         convenience_page("007700", "OK", successmessage);
 336 }
 337
 338
 339 /*
 340  * Authorization required page (sends a 401, causing the browser to request login credentials)
 341  */
 342 void authorization_required(void)
 343 {
 344         wcsession *WCC = WC;
 345         const char *message = "";
 346
 347         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 348         hprintf(
 349                 "Server: %s / %s\r\n"
 350                 "Connection: close\r\n",
 351                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 352         );
 353         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 354         hprintf("Content-Type: text/html\r\n");
 355         begin_burst();
 356         wc_printf("<h1>");
 357         wc_printf(_("Authorization Required"));
 358         wc_printf("</h1>\r\n");
 359
 360
 361         if (WCC->ImportantMsg != NULL)
 362                 message = ChrPtr(WCC->ImportantMsg);
 363         else if (WCC->ImportantMessage != NULL)
 364                 message = WCC->ImportantMessage;
 365
 366         wc_printf(_("The resource you requested requires a valid username and password. "
 367                 "You could not be logged in: %s\n"), message);
 368         wDumpContent(0);
 369         end_webcit_session();
 370 }
 371
 372 /*
 373  * Convenience functions to wrap around asynchronous ajax responses
 374  */
 375 void begin_ajax_response(void) {
 376         wcsession *WCC = WC;
 377
 378         FlushStrBuf(WCC->HBuf);
 379         output_headers(0, 0, 0, 0, 0, 0);
 380
 381         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 382                 "Server: %s\r\n"
 383                 "Connection: close\r\n"
 384                 ,
 385                 PACKAGE_STRING);
 386         begin_burst();
 387 }
 388
 389 /*
 390  * print ajax response footer
 391  */
 392 void end_ajax_response(void) {
 393         wDumpContent(0);
 394 }
 395
 396
 397
 398 /*
 399  * Wraps a Citadel server command in an AJAX transaction.
 400  */
 401 void ajax_servcmd(void)
 402 {
 403         wcsession *WCC = WC;
 404         int Done = 0;
 405         StrBuf *Buf;
 406         char *junk;
 407         size_t len;
 408
 409         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"\n", bstr("g_cmd") );
 410         begin_ajax_response();
 411         Buf = NewStrBuf();
 412         serv_puts(bstr("g_cmd"));
 413         StrBuf_ServGetln(Buf);
 414         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 415         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 416
 417         switch (GetServerStatus(Buf, NULL)) {
 418         case 8:
 419                 serv_puts("\n\n000");
 420                 if ( (StrLength(Buf)==3) &&
 421                      !strcmp(ChrPtr(Buf), "000")) {
 422                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 423                         break;
 424                 }
 425         case 1:
 426                 while (!Done) {
 427                         if (StrBuf_ServGetln(Buf) < 0)
 428                                 break;
 429                         if ( (StrLength(Buf)==3) &&
 430                              !strcmp(ChrPtr(Buf), "000")) {
 431                                 Done = 1;
 432                         }
 433                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 434                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 435                 }
 436                 break;
 437         case 4:
 438                 text_to_server(bstr("g_input"));
 439                 serv_puts("000");
 440                 break;
 441         case 6:
 442                 len = atol(&ChrPtr(Buf)[4]);
 443                 StrBuf_ServGetBLOBBuffered(Buf, len);
 444                 break;
 445         case 7:
 446                 len = atol(&ChrPtr(Buf)[4]);
 447                 junk = malloc(len);
 448                 memset(junk, 0, len);
 449                 serv_write(junk, len);
 450                 free(junk);
 451         }
 452
 453         end_ajax_response();
 454
 455         /*
 456          * This is kind of an ugly hack, but this is the only place it can go.
 457          * If the command was GEXP, then the instant messenger window must be
 458          * running, so reset the "last_pager_check" watchdog timer so
 459          * that page_popup() doesn't try to open it a second time.
 460          */
 461         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 462                 WCC->last_pager_check = time(NULL);
 463         }
 464         FreeStrBuf(&Buf);
 465 }
 466
 467
 468 /*
 469  * Helper function for the asynchronous check to see if we need
 470  * to open the instant messenger window.
 471  */
 472 void seconds_since_last_gexp(void)
 473 {
 474         char buf[256];
 475
 476         if ( (time(NULL) - WC->last_pager_check) < 30) {
 477                 wc_printf("NO\n");
 478         }
 479         else {
 480                 memset(buf, 0, 5);
 481                 serv_puts("NOOP");
 482                 serv_getln(buf, sizeof buf);
 483                 if (buf[3] == '*') {
 484                         wc_printf("YES");
 485                 }
 486                 else {
 487                         wc_printf("NO");
 488                 }
 489         }
 490 }
 491
 492
 493 /*
 494  * Save a URL destination so we can go to it later
 495  */
 496 void push_destination(void) {
 497         wcsession *WCC = WC;
 498
 499         if (!WCC) {
 500                 wc_printf("no session");
 501                 return;
 502         }
 503
 504         FreeStrBuf(&WCC->PushedDestination);
 505         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 506         syslog(9, "Push: %s\n", ChrPtr(WCC->PushedDestination));
 507         wc_printf("OK");
 508 }
 509
 510 /*
 511  * Go to the URL saved by push_destination()
 512  */
 513 void pop_destination(void) {
 514         wcsession *WCC = WC;
 515
 516         /*
 517          * If we are in the middle of a new user signup, the server may request that
 518          * we first pass through a registration screen.
 519          */
 520         if ((WCC) && (WCC->need_regi)) {
 521                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 522                         /* Registering will take us to the My Citadel Config room, so save our place */
 523                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 524                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 525                 }
 526                 WCC->need_regi = 0;
 527                 display_reg(1);
 528                 return;
 529         }
 530
 531         /*
 532          * Do something reasonable if we somehow ended up requesting a pop without
 533          * having first done a push.
 534          */
 535         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 536                 do_welcome();
 537                 return;
 538         }
 539
 540         /*
 541          * All righty then!  We have a destination saved, so go there now.
 542          */
 543         syslog(9, "Pop: %s\n", ChrPtr(WCC->PushedDestination));
 544         http_redirect(ChrPtr(WCC->PushedDestination));
 545 }
 546
 547
 548
 549 int ReadPostData(void)
 550 {
 551         int rc;
 552         int urlencoded_post = 0;
 553         wcsession *WCC = WC;
 554         StrBuf *content = NULL;
 555
 556         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 557
 558         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 559
 560         if (!urlencoded_post)
 561         {
 562                 StrBufPrintf(content,
 563                      "Content-type: %s\n"
 564                              "Content-length: %ld\n\n",
 565                              ChrPtr(WCC->Hdr->HR.ContentType),
 566                              WCC->Hdr->HR.ContentLength);
 567         }
 568
 569         /** Read the entire input data at once. */
 570         rc = client_read_to(WCC->Hdr, content,
 571                             WCC->Hdr->HR.ContentLength,
 572                             SLEEPING);
 573         if (rc < 0)
 574                 return rc;
 575
 576
 577         if (urlencoded_post) {
 578                 ParseURLParams(content);
 579         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 580                 char *Buf;
 581                 char *BufEnd;
 582                 long len;
 583
 584                 len = StrLength(content);
 585                 Buf = SmashStrBuf(&content);
 586                 BufEnd = Buf + len;
 587                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 588                 free(Buf);
 589         } else if (WCC->Hdr->HR.ContentLength > 0) {
 590                 WCC->upload = content;
 591                 WCC->upload_length = StrLength(WCC->upload);
 592                 content = NULL;
 593         }
 594         FreeStrBuf(&content);
 595         return 1;
 596 }
 597
 598
 599 void ParseREST_URL(void)
 600 {
 601         StrBuf *Buf;
 602         StrBuf *pFloor = NULL;
 603         wcsession *WCC = WC;
 604         long i = 0;
 605         const char *pCh = NULL;
 606         HashList *Floors;
 607         void *vFloor;
 608
 609         syslog(1, "parsing rest URL: %s\n", ChrPtr(WCC->Hdr->HR.ReqLine));
 610
 611         WCC->Directory = NewHash(1, Flathash);
 612         WCC->CurrentFloor = NULL;
 613
 614         Buf = NewStrBuf();
 615         while (StrBufExtract_NextToken(Buf, WCC->Hdr->HR.ReqLine, &pCh,  '/') >= 0)
 616         {
 617                 if (StrLength(Buf) != 0) {
 618                         /* ignore empty path segments */
 619                         StrBufUnescape(Buf, 1);
 620                         Put(WCC->Directory, IKEY(i), Buf, HFreeStrBuf);
 621                         if (i==0)
 622                                 pFloor = Buf;
 623                         Buf = NewStrBuf();
 624                 }
 625                 i++;
 626         }
 627
 628         FreeStrBuf(&Buf);
 629         if (pFloor != NULL)
 630         {
 631                 Floors = GetFloorListHash(NULL, NULL);
 632
 633                 if (Floors != NULL)
 634                 {
 635                         if (GetHash(WCC->FloorsByName, SKEY(pFloor), &vFloor))
 636                                 WCC->CurrentFloor = (Floor*) vFloor;
 637                 }
 638         }
 639 }
 640
 641 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 642 {
 643         long Depth, IsDepth;
 644         long offset = 0;
 645         wcsession *WCC = WC;
 646
 647         if (WCC->Hdr->HR.Handler != NULL)
 648                 offset ++;
 649         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 650         IsDepth = GetCount(WCC->Directory) + offset;
 651
 652 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 653         if (Depth < 0) {
 654                 Depth = -Depth;
 655                 return IsDepth > Depth;
 656         }
 657         else
 658                 return Depth == IsDepth;
 659 }
 660
 661
 662
 663 /*
 664  * Entry point for WebCit transaction
 665  */
 666 void session_loop(void)
 667 {
 668         int Flags = 0;
 669         int xhttp;
 670         StrBuf *Buf;
 671
 672         /*
 673          * We stuff these with the values coming from the client cookies,
 674          * so we can use them to reconnect a timed out session if we have to.
 675          */
 676         wcsession *WCC;
 677
 678         WCC= WC;
 679         WCC->upload_length = 0;
 680         WCC->upload = NULL;
 681         WCC->Hdr->nWildfireHeaders = 0;
 682         if (WCC->Hdr->HR.Handler != NULL)
 683                 Flags = WCC->Hdr->HR.Handler->Flags; /* so we can temporarily add our own... */
 684
 685         if (WCC->Hdr->HR.ContentLength > 0) {
 686                 if (ReadPostData() < 0) {
 687                         return;
 688                 }
 689         }
 690
 691         Buf = NewStrBuf();
 692         WCC->trailing_javascript = NewStrBuf();
 693
 694         /* Convert base64-encoded URL's back to plain text */
 695         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 696                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 697                 StrBufDecodeBase64(WCC->Hdr->this_page);
 698                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 699                 goto SKIP_ALL_THIS_CRAP;
 700         }
 701
 702         /* If there are variables in the URL, we must grab them now */
 703         if (WCC->Hdr->PlainArgs != NULL)
 704                 ParseURLParams(WCC->Hdr->PlainArgs);
 705
 706         /* If the client sent a nonce that is incorrect, kill the request. */
 707         if (havebstr("nonce")) {
 708                 syslog(9, "Comparing supplied nonce %s to session nonce %d\n",
 709                         bstr("nonce"), WCC->nonce
 710                 );
 711                 if (ibstr("nonce") != WCC->nonce) {
 712                         syslog(9, "Ignoring request with mismatched nonce.\n");
 713                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 714                         hprintf("Content-Type: text/plain\r\n");
 715                         begin_burst();
 716                         wc_printf("Security check failed.\r\n");
 717                         end_burst();
 718                         goto SKIP_ALL_THIS_CRAP;
 719                 }
 720         }
 721
 722         /*
 723          * If we're not connected to a Citadel server, try to hook up the connection now.
 724          */
 725         if (!WCC->connected) {
 726                 if (GetConnected()) {
 727                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 728                         hprintf("Content-Type: text/html\r\n");
 729                         begin_burst();
 730                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 731                         wc_printf(_("This program was unable to connect or stay "
 732                                 "connected to the Citadel server.  Please report "
 733                                 "this problem to your system administrator.")
 734                         );
 735                         wc_printf("<br>");
 736                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 737                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 738                                 _("Read More...")
 739                         );
 740                         wc_printf("</body></html>\n");
 741                         end_burst();
 742                         goto SKIP_ALL_THIS_CRAP;
 743                 }
 744         }
 745
 746         /*
 747          * If we're not logged in, but we have authentication data (either from
 748          * a cookie or from http-auth), try logging in to Citadel using that.
 749          */
 750         if ((!WCC->logged_in)
 751             && (StrLength(WCC->Hdr->c_username) > 0)
 752             && (StrLength(WCC->Hdr->c_password) > 0))
 753         {
 754                 long Status;
 755
 756                 FlushStrBuf(Buf);
 757                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 758                 StrBuf_ServGetln(Buf);
 759                 if (GetServerStatus(Buf, &Status) == 3) {
 760                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 761                         StrBuf_ServGetln(Buf);
 762                         if (GetServerStatus(Buf, NULL) == 2) {
 763                                 become_logged_in(WCC->Hdr->c_username,
 764                                                  WCC->Hdr->c_password, Buf);
 765                         } else {
 766                                 /* Should only display when password is wrong */
 767                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 768                                 authorization_required();
 769                                 FreeStrBuf(&Buf);
 770                                 goto SKIP_ALL_THIS_CRAP;
 771                         }
 772                 }
 773                 else if (Status == 541) {
 774                         WCC->logged_in = 1;
 775                 }
 776         }
 777
 778         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 779                 (WCC->Hdr->HR.eReqType != ePOST) &&
 780                 (WCC->Hdr->HR.eReqType != eHEAD);
 781
 782         /*
 783          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 784          * prior to doing anything else.
 785          */
 786         if (havebstr("go")) {
 787                 int ret;
 788                 syslog(9, "Explicit room selection: %s\n", bstr("go"));
 789                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 790                 if ((ret/100) != 2) {
 791                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("go"), ret);
 792                 }
 793         }
 794         else if (havebstr("gotofirst")) {
 795                 int ret;
 796                 syslog(9, "Explicit room selection: %s\n", bstr("gotofirst"));
 797                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 798                 if ((ret/100) != 2) {
 799                         syslog(1, "Unable to change to [%s]; Reason: %d\n", bstr("gotofirst"), ret);
 800                 }
 801         }
 802
 803         /*
 804          * If we aren't in any room yet, but we have cookie data telling us where we're
 805          * supposed to be, and 'go' was not specified, then go there.
 806          */
 807         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 808                 int ret;
 809
 810                 syslog(9, "We are in '%s' but cookie indicates '%s', going there...\n",
 811                         ChrPtr(WCC->CurRoom.name),
 812                         ChrPtr(WCC->Hdr->c_roomname)
 813                 );
 814                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 815                 if ((ret/100) != 2) {
 816                         syslog(1, "COOKIEGOTO: Unable to change to [%s]; Reason: %d\n",
 817                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 818                 }
 819         }
 820
 821         if (WCC->Hdr->HR.Handler != NULL) {
 822                 if (    (!WCC->logged_in)
 823                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 824                         && (WCC->serv_info->serv_supports_guest == 0)
 825                 ) {
 826                         display_login();
 827                 }
 828                 else {
 829 /*
 830                         if ((WCC->Hdr->HR.Handler->Flags & PARSE_REST_URL) != 0)
 831                                 ParseREST_URL();
 832 */
 833                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 834                                 begin_ajax_response();
 835                         WCC->Hdr->HR.Handler->F();
 836                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0)
 837                                 end_ajax_response();
 838                 }
 839         }
 840         /* When all else fails, display the default landing page or a main menu. */
 841         else {
 842                 /*
 843                  * ordinary browser users get a nice login screen, DAV etc. requsets
 844                  * are given a 401 so they can handle it appropriate.
 845                  */
 846                 if (!WCC->logged_in)  {
 847                         if (xhttp) {
 848                                 authorization_required();
 849                         }
 850                         else {
 851                                 display_default_landing_page();
 852                         }
 853                 }
 854                 /*
 855                  * Toplevel dav requests? or just a flat browser request?
 856                  */
 857                 else {
 858                         if (xhttp)
 859                                 groupdav_main();
 860                         else
 861                                 display_main_menu();
 862                 }
 863         }
 864
 865 SKIP_ALL_THIS_CRAP:
 866         FreeStrBuf(&Buf);
 867         fflush(stdout);
 868 }
 869
 870
 871
 872 /*
 873  * Display the appropriate landing page for this site.
 874  */
 875 void display_default_landing_page(void) {
 876         wcsession *WCC = WC;
 877
 878         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 879                 /* default action.  probably revisit this. */
 880                 StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 881                 smart_goto(teh_lobby);
 882                 FreeStrBuf(&teh_lobby);
 883         }
 884         else {
 885                 display_login();
 886         }
 887 }
 888
 889
 890 /*
 891  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 892  */
 893 void sleeeeeeeeeep(int seconds)
 894 {
 895         struct timeval tv;
 896
 897         tv.tv_sec = seconds;
 898         tv.tv_usec = 0;
 899         select(0, NULL, NULL, NULL, &tv);
 900 }
 901
 902 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 903 {
 904         return is_https != 0;
 905 }
 906
 907 void AppendImportantMessage(const char *pch, long len)
 908 {
 909         wcsession *WCC = WC;
 910
 911         if (StrLength(WCC->ImportantMsg) > 0) {
 912                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 913         }
 914
 915         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 916 }
 917
 918 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 919 {
 920         wcsession *WCC = WC;
 921         if (WCC != NULL)
 922                 return ((!IsEmptyStr(WCC->ImportantMessage)) ||
 923                         (StrLength(WCC->ImportantMsg) > 0));
 924         else
 925                 return 0;
 926 }
 927
 928 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 929 {
 930         wcsession *WCC = WC;
 931
 932         if (WCC != NULL) {
 933                 if (!IsEmptyStr(WCC->ImportantMessage)) {
 934                         StrEscAppend(Target, NULL, WCC->ImportantMessage, 0, 0);
 935                         WCC->ImportantMessage[0] = '\0';
 936                 }
 937                 else if (StrLength(WCC->ImportantMsg) > 0) {
 938                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 939                         FlushStrBuf(WCC->ImportantMsg);
 940                 }
 941         }
 942 }
 943
 944 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 945 {
 946         wcsession *WCC = WC;
 947
 948         if (WCC != NULL)
 949                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 950 }
 951
 952 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 953 {
 954         StrBufAppendBuf(Target,
 955                         csslocal, 0);
 956 }
 957
 958 extern char static_local_dir[PATH_MAX];
 959
 960
 961 void
 962 InitModule_WEBCIT
 963 (void)
 964 {
 965         char dir[SIZ];
 966         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 967         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 968         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 969         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 970         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 971         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 972         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 973
 974         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 975         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
 976         RegisterConditional(HKEY("COND:REST:DEPTH"), 0, Conditional_REST_DEPTH, CTX_NONE);
 977         RegisterConditional(HKEY("COND:IS_HTTPS"), 0, Conditional_IS_HTTPS, CTX_NONE);
 978
 979         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 980         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 981         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 982         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 983
 984
 985         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 986         if (!access(dir, R_OK)) {
 987                 syslog(9, "Using local Stylesheet [%s]\n", dir);
 988                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 989         }
 990         else
 991                 syslog(9, "No Site-local Stylesheet [%s] installed. \n", dir);
 992
 993 }
 994
 995 void
 996 ServerStartModule_WEBCIT
 997 (void)
 998 {
 999         HandlerHash = NewHash(1, NULL);
1000 }
1001
1002
1003 void
1004 ServerShutdownModule_WEBCIT
1005 (void)
1006 {
1007         FreeStrBuf(&csslocal);
1008         DeleteHash(&HandlerHash);
1009 }
1010
1011
1012
1013 void
1014 SessionNewModule_WEBCIT
1015 (wcsession *sess)
1016 {
1017         sess->ImportantMsg = NewStrBuf();
1018         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
1019         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
1020 }
1021
1022 void
1023 SessionDetachModule_WEBCIT
1024 (wcsession *sess)
1025 {
1026         DeleteHash(&sess->Directory);
1027
1028         FreeStrBuf(&sess->upload);
1029         sess->upload_length = 0;
1030
1031         FreeStrBuf(&sess->trailing_javascript);
1032
1033         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
1034         {
1035                 FreeStrBuf(&sess->WBuf);
1036                 sess->WBuf = NewStrBuf();
1037         }
1038         else
1039                 FlushStrBuf(sess->WBuf);
1040         FlushStrBuf(sess->HBuf);
1041 }
1042
1043 void
1044 SessionDestroyModule_WEBCIT
1045 (wcsession *sess)
1046 {
1047         FreeStrBuf(&sess->WBuf);
1048         FreeStrBuf(&sess->HBuf);
1049         FreeStrBuf(&sess->ImportantMsg);
1050         FreeStrBuf(&sess->PushedDestination);
1051 }
1052