webcit/webcit.c

   1 /*
   2  * This is the main transaction loop of the web service.  It maintains a
   3  * persistent session to the Citadel server, handling HTTP WebCit requests as
   4  * they arrive and presenting a user interface.
   5  *
   6  * Copyright (c) 1996-2013 by the citadel.org team
   7  *
   8  * This program is open source software.  You can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License, version 3.
  10  */
  11
  12 #define SHOW_ME_VAPPEND_PRINTF
  13 #include <stdio.h>
  14 #include <stdarg.h>
  15 #include "webcit.h"
  16 #include "dav.h"
  17 #include "webserver.h"
  18
  19 StrBuf *csslocal = NULL;
  20 HashList *HandlerHash = NULL;
  21
  22 void stuff_to_cookie(int unset_cookie);
  23 extern int GetConnected(void);
  24
  25
  26 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt)
  27 {
  28         wcsession *WCC = WC;
  29         int n;
  30
  31         n = GetCount(WCC->Hdr->HTTPHeaders);
  32         Put(WCC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  33 }
  34
  35 void DeleteWebcitHandler(void *vHandler)
  36 {
  37         WebcitHandler *Handler = (WebcitHandler*) vHandler;
  38         FreeStrBuf(&Handler->Name);
  39         FreeStrBuf(&Handler->DisplayName);
  40         free (Handler);
  41 }
  42
  43 void WebcitAddUrlHandler(const char * UrlString, long UrlSLen,
  44                          const char *DisplayName, long dslen,
  45                          WebcitHandlerFunc F,
  46                          long Flags)
  47 {
  48         WebcitHandler *NewHandler;
  49         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  50         NewHandler->F = F;
  51         NewHandler->Flags = Flags;
  52         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  53         StrBufShrinkToFit(NewHandler->Name, 1);
  54         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  55         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  56         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  57 }
  58
  59 void tmplput_HANDLER_DISPLAYNAME(StrBuf *Target, WCTemplputParams *TP)
  60 {
  61         wcsession *WCC = WC;
  62         if (WCC->Hdr->HR.Handler != NULL)
  63                 StrBufAppendTemplate(Target, TP, WCC->Hdr->HR.Handler->DisplayName, 0);
  64 }
  65
  66
  67 /*
  68  * web-printing funcion. uses our vsnprintf wrapper
  69  */
  70 #ifdef UBER_VERBOSE_DEBUGGING
  71 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format,...)
  72 #else
  73 void wc_printf(const char *format,...)
  74 #endif
  75 {
  76         wcsession *WCC = WC;
  77         va_list arg_ptr;
  78
  79         if (WCC->WBuf == NULL)
  80                 WCC->WBuf = NewStrBuf();
  81 #ifdef UBER_VERBOSE_DEBUGGING
  82         StrBufAppendPrintf(WCC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  83 #endif
  84
  85         va_start(arg_ptr, format);
  86         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  87         va_end(arg_ptr);
  88 #ifdef UBER_VERBOSE_DEBUGGING
  89         StrBufAppendPrintf(WCC->WBuf, "]\n");
  90 #endif
  91 }
  92
  93 /*
  94  * http-header-printing funcion. uses our vsnprintf wrapper
  95  */
  96 void hprintf(const char *format,...)
  97 {
  98         wcsession *WCC = WC;
  99         va_list arg_ptr;
 100
 101         va_start(arg_ptr, format);
 102         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
 103         va_end(arg_ptr);
 104 }
 105
 106
 107
 108 /*
 109  * wrap up an HTTP session, closes tags, etc.
 110  *
 111  * print_standard_html_footer should be set to:
 112  * 0            - to transmit only,
 113  * nonzero      - to append the closing tags
 114  */
 115 void wDumpContent(int print_standard_html_footer)
 116 {
 117         if (print_standard_html_footer) {
 118                 wc_printf("</div> <!-- end of 'content' div -->\n");
 119                 do_template("trailing");
 120         }
 121
 122         /* If we've been saving it all up for one big output burst,
 123          * go ahead and do that now.
 124          */
 125         end_burst();
 126 }
 127
 128
 129
 130
 131 /*
 132  * Output HTTP headers and leading HTML for a page
 133  */
 134 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                        */
 135                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 136                         int do_room_banner,     /* 1 = include the room banner and <div id="content"></div> */
 137                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 138                         int suppress_check,     /* 1 = suppress check for instant messages        */
 139                         int cache               /* 1 = allow browser to cache this page      */
 140 ) {
 141         wcsession *WCC = WC;
 142         char httpnow[128];
 143
 144         hprintf("HTTP/1.1 200 OK\n");
 145         http_datestring(httpnow, sizeof httpnow, time(NULL));
 146
 147         if (do_httpheaders) {
 148                 if (WCC->serv_info != NULL)
 149                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 150                                 "Server: %s / %s\n"
 151                                 "Connection: close\r\n",
 152                                 PACKAGE_STRING,
 153                                 ChrPtr(WCC->serv_info->serv_software));
 154                 else
 155                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 156                                 "Server: %s / [n/a]\n"
 157                                 "Connection: close\r\n",
 158                                 PACKAGE_STRING);
 159         }
 160
 161         if (cache > 0) {
 162                 char httpTomorow[128];
 163
 164                 http_datestring(httpTomorow, sizeof httpTomorow,
 165                                 time(NULL) + 60 * 60 * 24 * 2);
 166
 167                 hprintf("Pragma: public\r\n"
 168                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 169                         "Last-modified: %s\r\n"
 170                         "Expires: %s\r\n",
 171                         httpnow,
 172                         httpTomorow
 173                 );
 174         }
 175         else {
 176                 hprintf("Pragma: no-cache\r\n"
 177                         "Cache-Control: no-store\r\n"
 178                         "Expires: -1\r\n"
 179                 );
 180         }
 181
 182         if (cache < 2) stuff_to_cookie(unset_cookies);
 183
 184         if (do_htmlhead) {
 185                 begin_burst();
 186                 do_template("head");
 187                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 188                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 189                 }
 190                 if (do_room_banner) {
 191                         tmplput_roombanner(NULL, NULL);
 192                 }
 193         }
 194
 195         if (do_room_banner) {
 196                 wc_printf("<div id=\"content\">\n");
 197         }
 198 }
 199
 200 void output_custom_content_header(const char *ctype) {
 201         hprintf("HTTP/1.1 200 OK\r\n");
 202         hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 203         hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 204         hprintf("Connection: close\r\n");
 205 }
 206
 207
 208 /*
 209  * Generic function to do an HTTP redirect.  Easy and fun.
 210  */
 211 void http_redirect(const char *whichpage) {
 212         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 213         hprintf("Location: %s\r\n", whichpage);
 214         hprintf("URI: %s\r\n", whichpage);
 215         hprintf("Content-type: text/html; charset=utf-8\r\n");
 216         stuff_to_cookie(0);
 217         begin_burst();
 218         wc_printf("<html><body>");
 219         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 220         wc_printf("</body></html>\n");
 221         end_burst();
 222 }
 223
 224
 225
 226 /*
 227  * Output a piece of content to the web browser using conformant HTTP and MIME semantics.
 228  *
 229  * If this function is called, it is expected that begin_burst() has already been called
 230  * and some sort of content has been fed into the buffer.  This function will transmit a
 231  * bunch of headers to the client.  end_burst() will add some headers of its own, and then
 232  * transmit the buffered content to the client.
 233  */
 234 void http_transmit_thing(const char *content_type, int is_static)
 235 {
 236         syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 237         output_headers(0, 0, 0, 0, 0, is_static);
 238
 239         hprintf("Content-type: %s\r\n"
 240                 "Server: %s\r\n"
 241                 "Connection: close\r\n",
 242                 content_type,
 243                 PACKAGE_STRING);
 244
 245         end_burst();
 246 }
 247
 248
 249 /*
 250  * Convenience functions to display a page containing only a string
 251  *
 252  * titlebarcolor        color of the titlebar of the frame
 253  * titlebarmsg          text to display in the title bar
 254  * messagetext          body of the box
 255  */
 256 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 257 {
 258         hprintf("HTTP/1.1 200 OK\n");
 259         output_headers(1, 1, 1, 0, 0, 0);
 260         wc_printf("<div id=\"room_banner_override\">\n");
 261         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 262         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 263         wc_printf("</td></tr></table>\n");
 264         wc_printf("</div>\n<div id=\"content\">\n");
 265         escputs(messagetext);
 266         wc_printf("<hr />\n");
 267         wDumpContent(1);
 268 }
 269
 270
 271 /*
 272  * Display a blank page.
 273  */
 274 void blank_page(void) {
 275         output_headers(1, 1, 0, 0, 0, 0);
 276         wDumpContent(2);
 277 }
 278
 279
 280 /*
 281  * A template has been requested
 282  */
 283 void url_do_template(void) {
 284         const StrBuf *MimeType;
 285         const StrBuf *Tmpl = sbstr("template");
 286         begin_burst();
 287         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 288         http_transmit_thing(ChrPtr(MimeType), 0);
 289 }
 290
 291
 292
 293 /*
 294  * convenience function to indicate success
 295  */
 296 void display_success(const char *successmessage)
 297 {
 298         convenience_page("007700", "OK", successmessage);
 299 }
 300
 301
 302 /*
 303  * Authorization required page (sends a 401, causing the browser to request login credentials)
 304  */
 305 void authorization_required(void)
 306 {
 307         wcsession *WCC = WC;
 308         const char *message = "";
 309
 310         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 311         hprintf(
 312                 "Server: %s / %s\r\n"
 313                 "Connection: close\r\n",
 314                 PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 315         );
 316         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 317
 318         /* if this is a false cookie authentication, remove it to avoid endless loops. */
 319         if (StrLength(WCC->Hdr->HR.RawCookie) > 0)
 320                 stuff_to_cookie(1);
 321
 322         hprintf("Content-Type: text/html\r\n");
 323         begin_burst();
 324         wc_printf("<h1>");
 325         wc_printf(_("Authorization Required"));
 326         wc_printf("</h1>\r\n");
 327
 328         if (WCC->ImportantMsg != NULL) {
 329                 message = ChrPtr(WCC->ImportantMsg);
 330         }
 331
 332         wc_printf(
 333                 _("The resource you requested requires a valid username and password. "
 334                 "You could not be logged in: %s\n"),
 335                 message
 336         );
 337         wDumpContent(0);
 338 }
 339
 340
 341 /*
 342  * Convenience functions to wrap around asynchronous ajax responses
 343  */
 344 void begin_ajax_response(void) {
 345         wcsession *WCC = WC;
 346
 347         FlushStrBuf(WCC->HBuf);
 348         output_headers(0, 0, 0, 0, 0, 0);
 349
 350         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 351                 "Server: %s\r\n"
 352                 "Connection: close\r\n"
 353                 ,
 354                 PACKAGE_STRING);
 355         begin_burst();
 356 }
 357
 358
 359 /*
 360  * print ajax response footer
 361  */
 362 void end_ajax_response(void) {
 363         wDumpContent(0);
 364 }
 365
 366
 367 /*
 368  * Wraps a Citadel server command in an AJAX transaction.
 369  */
 370 void ajax_servcmd(void)
 371 {
 372         wcsession *WCC = WC;
 373         int Done = 0;
 374         StrBuf *Buf;
 375         char *junk;
 376         size_t len;
 377
 378         syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd") );
 379         begin_ajax_response();
 380         Buf = NewStrBuf();
 381         serv_puts(bstr("g_cmd"));
 382         StrBuf_ServGetln(Buf);
 383         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 384         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 385
 386         switch (GetServerStatus(Buf, NULL)) {
 387         case 8:
 388                 serv_puts("\n\n000");
 389                 if ( (StrLength(Buf)==3) &&
 390                      !strcmp(ChrPtr(Buf), "000")) {
 391                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 392                         break;
 393                 }
 394         case 1:
 395                 while (!Done) {
 396                         if (StrBuf_ServGetln(Buf) < 0)
 397                                 break;
 398                         if ( (StrLength(Buf)==3) &&
 399                              !strcmp(ChrPtr(Buf), "000")) {
 400                                 Done = 1;
 401                         }
 402                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 403                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 404                 }
 405                 break;
 406         case 4:
 407                 text_to_server(bstr("g_input"));
 408                 serv_puts("000");
 409                 break;
 410         case 6:
 411                 len = atol(&ChrPtr(Buf)[4]);
 412                 StrBuf_ServGetBLOBBuffered(Buf, len);
 413                 break;
 414         case 7:
 415                 len = atol(&ChrPtr(Buf)[4]);
 416                 junk = malloc(len);
 417                 memset(junk, 0, len);
 418                 serv_write(junk, len);
 419                 free(junk);
 420         }
 421
 422         end_ajax_response();
 423
 424         /*
 425          * This is kind of an ugly hack, but this is the only place it can go.
 426          * If the command was GEXP, then the instant messenger window must be
 427          * running, so reset the "last_pager_check" watchdog timer so
 428          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 429          */
 430         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 431                 WCC->last_pager_check = time(NULL);
 432         }
 433         FreeStrBuf(&Buf);
 434 }
 435
 436
 437 /*
 438  * Helper function for the asynchronous check to see if we need
 439  * to open the instant messenger window.
 440  */
 441 void seconds_since_last_gexp(void)
 442 {
 443         char buf[256];
 444
 445         if ( (time(NULL) - WC->last_pager_check) < 30) {
 446                 wc_printf("NO\n");
 447         }
 448         else {
 449                 memset(buf, 0, 5);
 450                 serv_puts("NOOP");
 451                 serv_getln(buf, sizeof buf);
 452                 if (buf[3] == '*') {
 453                         wc_printf("YES");
 454                 }
 455                 else {
 456                         wc_printf("NO");
 457                 }
 458         }
 459 }
 460
 461
 462 /*
 463  * Save a URL destination so we can go to it later
 464  */
 465 void push_destination(void) {
 466         wcsession *WCC = WC;
 467
 468         if (!WCC) {
 469                 wc_printf("no session");
 470                 return;
 471         }
 472
 473         FreeStrBuf(&WCC->PushedDestination);
 474         WCC->PushedDestination = NewStrBufDup(SBSTR("url"));
 475         syslog(LOG_DEBUG, "Push: %s", ChrPtr(WCC->PushedDestination));
 476         wc_printf("OK");
 477 }
 478
 479
 480 /*
 481  * Go to the URL saved by push_destination()
 482  */
 483 void pop_destination(void) {
 484         wcsession *WCC = WC;
 485
 486         /*
 487          * If we are in the middle of a new user signup, the server may request that
 488          * we first pass through a registration screen.
 489          */
 490         if ((WCC) && (WCC->need_regi)) {
 491                 if ((WCC->PushedDestination != NULL) && (StrLength(WCC->PushedDestination) > 0)) {
 492                         /* Registering will take us to the My Citadel Config room, so save our place */
 493                         StrBufAppendBufPlain(WCC->PushedDestination, HKEY("?go="), 0);
 494                         StrBufUrlescAppend(WCC->PushedDestination, WCC->CurRoom.name, NULL);
 495                 }
 496                 WCC->need_regi = 0;
 497                 display_reg(1);
 498                 return;
 499         }
 500
 501         /*
 502          * Do something reasonable if we somehow ended up requesting a pop without
 503          * having first done a push.
 504          */
 505         if ( (!WCC) || (WCC->PushedDestination == NULL) || (StrLength(WCC->PushedDestination) == 0) ) {
 506                 do_welcome();
 507                 return;
 508         }
 509
 510         /*
 511          * All righty then!  We have a destination saved, so go there now.
 512          */
 513         syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WCC->PushedDestination));
 514         http_redirect(ChrPtr(WCC->PushedDestination));
 515 }
 516
 517
 518
 519 int ReadPostData(void)
 520 {
 521         int rc;
 522         int urlencoded_post = 0;
 523         wcsession *WCC = WC;
 524         StrBuf *content = NULL;
 525
 526         urlencoded_post = (strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0) ;
 527
 528         content = NewStrBufPlain(NULL, WCC->Hdr->HR.ContentLength + 256);
 529
 530         if (!urlencoded_post)
 531         {
 532                 StrBufPrintf(content,
 533                      "Content-type: %s\n"
 534                              "Content-length: %ld\n\n",
 535                              ChrPtr(WCC->Hdr->HR.ContentType),
 536                              WCC->Hdr->HR.ContentLength);
 537         }
 538
 539         /** Read the entire input data at once. */
 540         rc = client_read_to(WCC->Hdr, content,
 541                             WCC->Hdr->HR.ContentLength,
 542                             SLEEPING);
 543         if (rc < 0)
 544                 return rc;
 545
 546
 547         if (urlencoded_post) {
 548                 ParseURLParams(content);
 549         } else if (!strncasecmp(ChrPtr(WCC->Hdr->HR.ContentType), "multipart", 9)) {
 550                 char *Buf;
 551                 char *BufEnd;
 552                 long len;
 553
 554                 len = StrLength(content);
 555                 Buf = SmashStrBuf(&content);
 556                 BufEnd = Buf + len;
 557                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 558                 free(Buf);
 559         } else if (WCC->Hdr->HR.ContentLength > 0) {
 560                 WCC->upload = content;
 561                 WCC->upload_length = StrLength(WCC->upload);
 562                 content = NULL;
 563         }
 564         FreeStrBuf(&content);
 565         return 1;
 566 }
 567
 568
 569 int Conditional_REST_DEPTH(StrBuf *Target, WCTemplputParams *TP)
 570 {
 571         long Depth, IsDepth;
 572         long offset = 0;
 573         wcsession *WCC = WC;
 574
 575         if (WCC->Hdr->HR.Handler != NULL)
 576                 offset ++;
 577         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 578         IsDepth = GetCount(WCC->Directory) + offset;
 579
 580 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 581         if (Depth < 0) {
 582                 Depth = -Depth;
 583                 return IsDepth > Depth;
 584         }
 585         else
 586                 return Depth == IsDepth;
 587 }
 588
 589
 590
 591 /*
 592  * Entry point for WebCit transaction
 593  */
 594 void session_loop(void)
 595 {
 596         int xhttp;
 597         StrBuf *Buf;
 598
 599         /*
 600          * We stuff these with the values coming from the client cookies,
 601          * so we can use them to reconnect a timed out session if we have to.
 602          */
 603         wcsession *WCC;
 604
 605         WCC= WC;
 606         WCC->upload_length = 0;
 607         WCC->upload = NULL;
 608         WCC->Hdr->nWildfireHeaders = 0;
 609
 610         if (WCC->Hdr->HR.ContentLength > 0) {
 611                 if (ReadPostData() < 0) {
 612                         return;
 613                 }
 614         }
 615
 616         Buf = NewStrBuf();
 617         WCC->trailing_javascript = NewStrBuf();
 618
 619         /* Convert base64-encoded URL's back to plain text */
 620         if (!strncmp(ChrPtr(WCC->Hdr->this_page), "/B64", 4)) {
 621                 StrBufCutLeft(WCC->Hdr->this_page, 4);
 622                 StrBufDecodeBase64(WCC->Hdr->this_page);
 623                 http_redirect(ChrPtr(WCC->Hdr->this_page));
 624                 goto SKIP_ALL_THIS_CRAP;
 625         }
 626
 627         /* If there are variables in the URL, we must grab them now */
 628         if (WCC->Hdr->PlainArgs != NULL)
 629                 ParseURLParams(WCC->Hdr->PlainArgs);
 630
 631         /* If the client sent a nonce that is incorrect, kill the request. */
 632         if (havebstr("nonce")) {
 633                 syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d",
 634                         bstr("nonce"), WCC->nonce
 635                 );
 636                 if (ibstr("nonce") != WCC->nonce) {
 637                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 638                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 639                         hprintf("Content-Type: text/plain\r\n");
 640                         begin_burst();
 641                         wc_printf("Security check failed.\r\n");
 642                         end_burst();
 643                         goto SKIP_ALL_THIS_CRAP;
 644                 }
 645         }
 646
 647         /*
 648          * If we're not connected to a Citadel server, try to hook up the connection now.
 649          */
 650         if (!WCC->connected) {
 651                 if (GetConnected()) {
 652                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 653                         hprintf("Content-Type: text/html\r\n");
 654                         begin_burst();
 655                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 656                         wc_printf(_("This program was unable to connect or stay "
 657                                 "connected to the Citadel server.  Please report "
 658                                 "this problem to your system administrator.")
 659                         );
 660                         wc_printf("<br>");
 661                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 662                                 "faq:generalquestions:webcit_unable_to_connect\">%s</a>",
 663                                 _("Read More...")
 664                         );
 665                         wc_printf("</body></html>\n");
 666                         end_burst();
 667                         goto SKIP_ALL_THIS_CRAP;
 668                 }
 669         }
 670
 671         /*
 672          * If we're not logged in, but we have authentication data (either from
 673          * a cookie or from http-auth), try logging in to Citadel using that.
 674          */
 675         if (    (!WCC->logged_in)
 676                 && (StrLength(WCC->Hdr->c_username) > 0)
 677                 && (StrLength(WCC->Hdr->c_password) > 0)
 678         ) {
 679                 long Status;
 680
 681                 FlushStrBuf(Buf);
 682                 serv_printf("USER %s", ChrPtr(WCC->Hdr->c_username));
 683                 StrBuf_ServGetln(Buf);
 684                 if (GetServerStatus(Buf, &Status) == 3) {
 685                         serv_printf("PASS %s", ChrPtr(WCC->Hdr->c_password));
 686                         StrBuf_ServGetln(Buf);
 687                         if (GetServerStatus(Buf, NULL) == 2) {
 688                                 become_logged_in(WCC->Hdr->c_username,
 689                                                  WCC->Hdr->c_password, Buf);
 690                         } else {
 691                                 /* Should only display when password is wrong */
 692                                 WCC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 693                                 authorization_required();
 694                                 FreeStrBuf(&Buf);
 695                                 goto SKIP_ALL_THIS_CRAP;
 696                         }
 697                 }
 698                 else if (Status == 541) {
 699                         WCC->logged_in = 1;
 700                 }
 701         }
 702
 703         xhttp = (WCC->Hdr->HR.eReqType != eGET) &&
 704                 (WCC->Hdr->HR.eReqType != ePOST) &&
 705                 (WCC->Hdr->HR.eReqType != eHEAD);
 706
 707         /*
 708          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 709          * prior to doing anything else.
 710          */
 711         if (havebstr("go")) {
 712                 int ret;
 713                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 714                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 715                 if ((ret/100) != 2) {
 716                         syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 717                 }
 718         }
 719         else if (havebstr("gotofirst")) {
 720                 int ret;
 721                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 722                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 723                 if ((ret/100) != 2) {
 724                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 725                 }
 726         }
 727
 728         /*
 729          * If we aren't in any room yet, but we have cookie data telling us where we're
 730          * supposed to be, and 'go' was not specified, then go there.
 731          */
 732         else if ( (StrLength(WCC->CurRoom.name) == 0) && ( (StrLength(WCC->Hdr->c_roomname) > 0) )) {
 733                 int ret;
 734
 735                 syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 736                         ChrPtr(WCC->CurRoom.name),
 737                         ChrPtr(WCC->Hdr->c_roomname)
 738                 );
 739                 ret = gotoroom(WCC->Hdr->c_roomname);   /* do quietly to avoid session output! */
 740                 if ((ret/100) != 2) {
 741                         syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 742                                 ChrPtr(WCC->Hdr->c_roomname), ret);
 743                 }
 744         }
 745
 746         if (WCC->Hdr->HR.Handler != NULL) {
 747                 if (    (!WCC->logged_in)
 748                         && ((WCC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 749                         && (WCC->serv_info != NULL)
 750                         && (WCC->serv_info->serv_supports_guest == 0)
 751                 ) {
 752                         display_login();
 753                 }
 754                 else {
 755                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 756                                 begin_ajax_response();
 757                         }
 758                         WCC->Hdr->HR.Handler->F();
 759                         if ((WCC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 760                                 end_ajax_response();
 761                         }
 762                 }
 763         }
 764         /* When all else fails, display the default landing page or a main menu. */
 765         else {
 766                 /*
 767                  * ordinary browser users get a nice login screen, DAV etc. requsets
 768                  * are given a 401 so they can handle it appropriate.
 769                  */
 770                 if (!WCC->logged_in)  {
 771                         if (xhttp) {
 772                                 authorization_required();
 773                         }
 774                         else {
 775                                 display_default_landing_page();
 776                         }
 777                 }
 778                 /*
 779                  * Toplevel dav requests? or just a flat browser request?
 780                  */
 781                 else {
 782                         if (xhttp) {
 783                                 dav_main();
 784                         }
 785                         else {
 786                                 display_main_menu();
 787                         }
 788                 }
 789         }
 790
 791 SKIP_ALL_THIS_CRAP:
 792         FreeStrBuf(&Buf);
 793         fflush(stdout);
 794 }
 795
 796
 797
 798 /*
 799  * Display the appropriate landing page for this site.
 800  */
 801 void display_default_landing_page(void) {
 802         wcsession *WCC = WC;
 803
 804         if (WCC && WCC->serv_info && WCC->serv_info->serv_supports_guest) {
 805                 /* default action */
 806
 807                 if (havebstr("go")) {
 808                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 809                         StrBuf *teh_room = NewStrBufPlain(bstr("go"), strlen(bstr("go")));
 810                         smart_goto(teh_room);
 811                         FreeStrBuf(&teh_room);
 812                 }
 813                 else if (default_landing_page) {
 814                         http_redirect(default_landing_page);
 815                 }
 816                 else {
 817                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 818                         smart_goto(teh_lobby);
 819                         FreeStrBuf(&teh_lobby);
 820                 }
 821         }
 822         else {
 823                 display_login();
 824         }
 825 }
 826
 827
 828 /*
 829  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 830  */
 831 void sleeeeeeeeeep(int seconds)
 832 {
 833         struct timeval tv;
 834
 835         tv.tv_sec = seconds;
 836         tv.tv_usec = 0;
 837         select(0, NULL, NULL, NULL, &tv);
 838 }
 839
 840 int Conditional_IS_HTTPS(StrBuf *Target, WCTemplputParams *TP)
 841 {
 842         return is_https != 0;
 843 }
 844
 845 void AppendImportantMessage(const char *pch, long len)
 846 {
 847         wcsession *WCC = WC;
 848
 849         if (StrLength(WCC->ImportantMsg) > 0) {
 850                 StrBufAppendBufPlain(WCC->ImportantMsg, HKEY("\n"), 0);
 851         }
 852
 853         StrBufAppendBufPlain(WCC->ImportantMsg, pch, len, 0);
 854 }
 855
 856 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
 857 {
 858         wcsession *WCC = WC;
 859         if (WCC != NULL)
 860                 return (StrLength(WCC->ImportantMsg) > 0);
 861         else
 862                 return 0;
 863 }
 864
 865 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
 866 {
 867         wcsession *WCC = WC;
 868
 869         if (WCC != NULL) {
 870                 if (StrLength(WCC->ImportantMsg) > 0) {
 871                         StrEscAppend(Target, WCC->ImportantMsg, NULL, 0, 0);
 872                 }
 873         }
 874 }
 875
 876 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
 877 {
 878         wcsession *WCC = WC;
 879
 880         if (WCC != NULL)
 881                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
 882 }
 883
 884 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
 885 {
 886         StrBufAppendBuf(Target,
 887                         csslocal, 0);
 888 }
 889
 890 void tmplput_packagestring(StrBuf *Target, WCTemplputParams *TP)
 891 {
 892         StrBufAppendBufPlain(Target,
 893                              HKEY(PACKAGE_STRING), 0);
 894 }
 895
 896 extern char static_local_dir[PATH_MAX];
 897
 898
 899 void
 900 InitModule_WEBCIT
 901 (void)
 902 {
 903         char dir[SIZ];
 904         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS|COOKIEUNNEEDED|ISSTATIC);
 905         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS|COOKIEUNNEEDED);
 906         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 907         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX|LOGCHATTY);
 908         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 909         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 910         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 911         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 912
 913         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS|COOKIEUNNEEDED);
 914         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 915         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 916         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 917
 918         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 919         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, NULL, CTX_NONE);
 920         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 921         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 922         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 923
 924
 925         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 926         if (!access(dir, R_OK)) {
 927                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 928                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 929         }
 930         else
 931                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 932
 933 }
 934
 935 void
 936 ServerStartModule_WEBCIT
 937 (void)
 938 {
 939         HandlerHash = NewHash(1, NULL);
 940 }
 941
 942
 943 void
 944 ServerShutdownModule_WEBCIT
 945 (void)
 946 {
 947         FreeStrBuf(&csslocal);
 948         DeleteHash(&HandlerHash);
 949 }
 950
 951
 952
 953 void
 954 SessionNewModule_WEBCIT
 955 (wcsession *sess)
 956 {
 957         sess->ImportantMsg = NewStrBuf();
 958         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 959         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 960 }
 961
 962 void
 963 SessionDetachModule_WEBCIT
 964 (wcsession *sess)
 965 {
 966         DeleteHash(&sess->Directory);
 967
 968         FreeStrBuf(&sess->upload);
 969         sess->upload_length = 0;
 970
 971         FreeStrBuf(&sess->trailing_javascript);
 972
 973         if (StrLength(sess->WBuf) > SIZ * 30) /* Bigger than 120K? release. */
 974         {
 975                 FreeStrBuf(&sess->WBuf);
 976                 sess->WBuf = NewStrBuf();
 977         }
 978         else
 979                 FlushStrBuf(sess->WBuf);
 980         FlushStrBuf(sess->HBuf);
 981         if (StrLength(sess->ImportantMsg) > 0) {
 982                 FlushStrBuf(sess->ImportantMsg);
 983         }
 984
 985 }
 986
 987 void
 988 SessionDestroyModule_WEBCIT
 989 (wcsession *sess)
 990 {
 991         FreeStrBuf(&sess->WBuf);
 992         FreeStrBuf(&sess->HBuf);
 993         FreeStrBuf(&sess->ImportantMsg);
 994         FreeStrBuf(&sess->PushedDestination);
 995 }
 996