webcit/webcit.c

   1 /*
   2  * $Id$
   3  *
   4  * This is the main transaction loop of the web service.  It maintains a
   5  * persistent session to the Citadel server, handling HTTP WebCit requests as
   6  * they arrive and presenting a user interface.
   7  */
   8 #define SHOW_ME_VAPPEND_PRINTF
   9 #include <stdio.h>
  10 #include <stdarg.h>
  11 #include "webcit.h"
  12 #include "groupdav.h"
  13 #include "webserver.h"
  14
  15
  16 /*
  17  * String to unset the cookie.
  18  * Any date "in the past" will work, so I chose my birthday, right down to
  19  * the exact minute.  :)
  20  */
  21 static char *unset = "; expires=28-May-1971 18:10:00 GMT";
  22
  23 HashList *HandlerHash = NULL;
  24
  25 void WebcitAddUrlHandler(const char * UrlString,
  26                          long UrlSLen,
  27                          WebcitHandlerFunc F,
  28                          long Flags)
  29 {
  30         WebcitHandler *NewHandler;
  31
  32         if (HandlerHash == NULL)
  33                 HandlerHash = NewHash(1, NULL);
  34
  35         NewHandler = (WebcitHandler*) malloc(sizeof(WebcitHandler));
  36         NewHandler->F = F;
  37         NewHandler->Flags = Flags;
  38         Put(HandlerHash, UrlString, UrlSLen, NewHandler, NULL);
  39 }
  40
  41
  42 /*
  43  * web-printing funcion. uses our vsnprintf wrapper
  44  */
  45 void wprintf(const char *format,...)
  46 {
  47         wcsession *WCC = WC;
  48         va_list arg_ptr;
  49
  50         if (WCC->WBuf == NULL)
  51                 WCC->WBuf = NewStrBuf();
  52
  53         va_start(arg_ptr, format);
  54         StrBufVAppendPrintf(WCC->WBuf, format, arg_ptr);
  55         va_end(arg_ptr);
  56 }
  57
  58 /*
  59  * http-header-printing funcion. uses our vsnprintf wrapper
  60  */
  61 void hprintf(const char *format,...)
  62 {
  63         wcsession *WCC = WC;
  64         va_list arg_ptr;
  65
  66         va_start(arg_ptr, format);
  67         StrBufVAppendPrintf(WCC->HBuf, format, arg_ptr);
  68         va_end(arg_ptr);
  69 }
  70
  71
  72
  73 /*
  74  * wrap up an HTTP session, closes tags, etc.
  75  *
  76  * print_standard_html_footer should be set to:
  77  * 0            - to transmit only,
  78  * nonzero      - to append the closing tags
  79  */
  80 void wDumpContent(int print_standard_html_footer)
  81 {
  82         if (print_standard_html_footer) {
  83                 wprintf("</div> <!-- end of 'content' div -->\n");
  84                 do_template("trailing", NULL);
  85         }
  86
  87         /* If we've been saving it all up for one big output burst,
  88          * go ahead and do that now.
  89          */
  90         end_burst();
  91 }
  92
  93
  94
  95
  96 /*
  97  * Output HTTP headers and leading HTML for a page
  98  */
  99 void output_headers(    int do_httpheaders,     /* 1 = output HTTP headers                          */
 100                         int do_htmlhead,        /* 1 = output HTML <head> section and <body> opener */
 101
 102                         int do_room_banner,     /* 0=no, 1=yes,
 103                                                  * 2 = I'm going to embed my own, so don't open the
 104                                                  *     <div id="content"> either.
 105                                                  */
 106
 107                         int unset_cookies,      /* 1 = session is terminating, so unset the cookies */
 108                         int suppress_check,     /* 1 = suppress check for instant messages          */
 109                         int cache               /* 1 = allow browser to cache this page             */
 110 ) {
 111         wcsession *WCC = WC;
 112         char cookie[1024];
 113         char httpnow[128];
 114
 115         hprintf("HTTP/1.1 200 OK\n");
 116         http_datestring(httpnow, sizeof httpnow, time(NULL));
 117
 118         if (do_httpheaders) {
 119                 if (WCC->serv_info != NULL)
 120                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 121                                 "Server: %s / %s\n"
 122                                 "Connection: close\r\n",
 123                                 PACKAGE_STRING,
 124                                 ChrPtr(WCC->serv_info->serv_software));
 125                 else
 126                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 127                                 "Server: %s / [n/a]\n"
 128                                 "Connection: close\r\n",
 129                                 PACKAGE_STRING);
 130         }
 131
 132         if (cache) {
 133                 char httpTomorow[128];
 134
 135                 http_datestring(httpTomorow, sizeof httpTomorow,
 136                                 time(NULL) + 60 * 60 * 24 * 2);
 137
 138                 hprintf("Pragma: public\r\n"
 139                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 140                         "Last-modified: %s\r\n"
 141                         "Expires: %s\r\n",
 142                         httpnow,
 143                         httpTomorow
 144                 );
 145         }
 146         else {
 147                 hprintf("Pragma: no-cache\r\n"
 148                         "Cache-Control: no-store\r\n"
 149                         "Expires: -1\r\n"
 150                 );
 151         }
 152
 153         stuff_to_cookie(cookie, 1024,
 154                         WCC->wc_session, WCC->wc_username,
 155                         WCC->wc_password, WCC->wc_roomname);
 156
 157         if (unset_cookies) {
 158                 hprintf("Set-cookie: webcit=%s; path=/\r\n", unset);
 159         } else {
 160                 hprintf("Set-cookie: webcit=%s; path=/\r\n", cookie);
 161                 if (server_cookie != NULL) {
 162                         hprintf("%s\n", server_cookie);
 163                 }
 164         }
 165
 166         if (do_htmlhead) {
 167                 begin_burst();
 168                 do_template("head", NULL);
 169
 170                 /* check for ImportantMessages (these display in a div overlaying the main screen) */
 171                 if (!IsEmptyStr(WC->ImportantMessage)) {
 172                         wprintf("<div id=\"important_message\">\n"
 173                                 "<span class=\"imsg\">");
 174                         escputs(WC->ImportantMessage);
 175                         wprintf("</span><br />\n"
 176                                 "</div>\n"
 177                         );
 178                         StrBufAppendPrintf(WCC->trailing_javascript,
 179                                 "setTimeout('hide_imsg_popup()', 5000); \n"
 180                         );
 181                         WCC->ImportantMessage[0] = 0;
 182                 }
 183
 184                 if ( (WCC->logged_in) && (!unset_cookies) ) {
 185                   //DoTemplate(HKEY("iconbar"), NULL, &NoCtx);
 186                         page_popup();
 187                 }
 188
 189                 if (do_room_banner == 1) {
 190                         wprintf("<div id=\"banner\">\n");
 191                         embed_room_banner(NULL, navbar_default);
 192                         wprintf("</div>\n");
 193                 }
 194         }
 195
 196         if (do_room_banner == 1) {
 197                 wprintf("<div id=\"content\">\n");
 198         }
 199 }
 200
 201 void output_custom_content_header(const char *ctype) {
 202   hprintf("HTTP/1.1 200 OK\r\n");
 203   hprintf("Content-type: %s; charset=utf-8\r\n",ctype);
 204   hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 205   hprintf("Connection: close\r\n");
 206 }
 207
 208
 209 /*
 210  * Generic function to do an HTTP redirect.  Easy and fun.
 211  */
 212 void http_redirect(const char *whichpage) {
 213         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 214         hprintf("Location: %s\r\n", whichpage);
 215         hprintf("URI: %s\r\n", whichpage);
 216         hprintf("Content-type: text/html; charset=utf-8\r\n");
 217         wprintf("<html><body>");
 218         wprintf("Go <a href=\"%s\">here</A>.", whichpage);
 219         wprintf("</body></html>\n");
 220         end_burst();
 221 }
 222
 223
 224
 225 /*
 226  * Output a piece of content to the web browser using conformant HTTP and MIME semantics
 227  */
 228 void http_transmit_thing(const char *content_type,
 229                          int is_static) {
 230
 231 #ifndef TECH_PREVIEW
 232         lprintf(9, "http_transmit_thing(%s)%s\n",
 233                 content_type,
 234                 (is_static ? " (static)" : "")
 235         );
 236 #endif
 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  * print menu box like used in the floor view or admin interface.
 250  * This function takes pair of strings as va_args,
 251  * Title        Title string of the box
 252  * Class        CSS Class for the box
 253  * nLines       How many string pairs should we print? (URL, UrlText)
 254  * ...          Pairs of URL Strings and their Names
 255  */
 256 void print_menu_box(char* Title, char *Class, int nLines, ...)
 257 {
 258         va_list arg_list;
 259         long i;
 260
 261         svput("BOXTITLE", WCS_STRING, Title);
 262         do_template("beginboxx", NULL);
 263
 264         wprintf("<ul class=\"%s\">", Class);
 265
 266         va_start(arg_list, nLines);
 267         for (i = 0; i < nLines; ++i)
 268         {
 269                 wprintf("<li><a href=\"%s\">", va_arg(arg_list, char *));
 270                 wprintf((char *) va_arg(arg_list, char *));
 271                 wprintf("</a></li>\n");
 272         }
 273         va_end (arg_list);
 274
 275         wprintf("</a></li>\n");
 276
 277         wprintf("</ul>");
 278
 279         do_template("endbox", NULL);
 280 }
 281
 282
 283 /*
 284  * dump out static pages from disk
 285  */
 286 void output_static(const char *what)
 287 {
 288         int fd;
 289         struct stat statbuf;
 290         off_t bytes;
 291         off_t count = 0;
 292         const char *content_type;
 293         int len;
 294         const char *Err;
 295
 296         fd = open(what, O_RDONLY);
 297         if (fd <= 0) {
 298                 lprintf(9, "output_static('%s')  -- NOT FOUND --\n", what);
 299                 hprintf("HTTP/1.1 404 %s\r\n", strerror(errno));
 300                 hprintf("Content-Type: text/plain\r\n");
 301                 wprintf("Cannot open %s: %s\r\n", what, strerror(errno));
 302                 end_burst();
 303         } else {
 304                 len = strlen (what);
 305                 content_type = GuessMimeByFilename(what, len);
 306
 307                 if (fstat(fd, &statbuf) == -1) {
 308                         lprintf(9, "output_static('%s')  -- FSTAT FAILED --\n", what);
 309                         hprintf("HTTP/1.1 404 %s\r\n", strerror(errno));
 310                         hprintf("Content-Type: text/plain\r\n");
 311                         wprintf("Cannot fstat %s: %s\n", what, strerror(errno));
 312                         end_burst();
 313                         return;
 314                 }
 315
 316                 count = 0;
 317                 bytes = statbuf.st_size;
 318
 319                 if (StrBufReadBLOB(WC->WBuf, &fd, 1, bytes, &Err) < 0)
 320                 {
 321                         if (fd > 0) close(fd);
 322                         lprintf(9, "output_static('%s')  -- FREAD FAILED (%s) --\n", what, strerror(errno));
 323                                 hprintf("HTTP/1.1 500 internal server error \r\n");
 324                                 hprintf("Content-Type: text/plain\r\n");
 325                                 end_burst();
 326                                 return;
 327                 }
 328
 329
 330                 close(fd);
 331 #ifndef TECH_PREVIEW
 332                 lprintf(9, "output_static('%s')  %s\n", what, content_type);
 333 #endif
 334                 http_transmit_thing(content_type, 1);
 335         }
 336         if (yesbstr("force_close_session")) {
 337                 end_webcit_session();
 338         }
 339 }
 340
 341
 342 /*
 343  * Convenience functions to display a page containing only a string
 344  *
 345  * titlebarcolor        color of the titlebar of the frame
 346  * titlebarmsg          text to display in the title bar
 347  * messagetext          body of the box
 348  */
 349 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext)
 350 {
 351         hprintf("HTTP/1.1 200 OK\n");
 352         output_headers(1, 1, 2, 0, 0, 0);
 353         wprintf("<div id=\"banner\">\n");
 354         wprintf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 355         wprintf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 356         wprintf("</td></tr></table>\n");
 357         wprintf("</div>\n<div id=\"content\">\n");
 358         escputs(messagetext);
 359
 360         wprintf("<hr />\n");
 361         wDumpContent(1);
 362 }
 363
 364
 365 /*
 366  * Display a blank page.
 367  */
 368 void blank_page(void) {
 369         output_headers(1, 1, 0, 0, 0, 0);
 370         wDumpContent(2);
 371 }
 372
 373
 374 /*
 375  * A template has been requested
 376  */
 377 void url_do_template(void) {
 378         const StrBuf *MimeType;
 379         const StrBuf *Tmpl = sbstr("template");
 380         begin_burst();
 381         output_headers(0, 0, 0, 0, 1, 0);
 382         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 383         http_transmit_thing(ChrPtr(MimeType), 0);
 384 }
 385
 386
 387
 388 /*
 389  * convenience function to indicate success
 390  */
 391 void display_success(char *successmessage)
 392 {
 393         convenience_page("007700", "OK", successmessage);
 394 }
 395
 396
 397 /*
 398  * Authorization required page
 399  * This is probably temporary and should be revisited
 400  */
 401 void authorization_required(const char *message)
 402 {
 403         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 404         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 405         hprintf("Content-Type: text/html\r\n");
 406         wprintf("<h1>");
 407         wprintf(_("Authorization Required"));
 408         wprintf("</h1>\r\n");
 409         wprintf(_("The resource you requested requires a valid username and password. "
 410                 "You could not be logged in: %s\n"), message);
 411         wDumpContent(0);
 412
 413 }
 414
 415 /*
 416  * Convenience functions to wrap around asynchronous ajax responses
 417  */
 418 void begin_ajax_response(void) {
 419         wcsession *WCC = WC;
 420
 421         FlushStrBuf(WCC->HBuf);
 422         output_headers(0, 0, 0, 0, 0, 0);
 423
 424         hprintf("Content-type: text/html; charset=UTF-8\r\n"
 425                 "Server: %s\r\n"
 426                 "Connection: close\r\n"
 427                 ,
 428                 PACKAGE_STRING);
 429         begin_burst();
 430 }
 431
 432 /*
 433  * print ajax response footer
 434  */
 435 void end_ajax_response(void) {
 436         wDumpContent(0);
 437 }
 438
 439 /*
 440  * Wraps a Citadel server command in an AJAX transaction.
 441  */
 442 void ajax_servcmd(void)
 443 {
 444         wcsession *WCC = WC;
 445         int Done = 0;
 446         StrBuf *Buf;
 447         char *junk;
 448         size_t len;
 449
 450         begin_ajax_response();
 451         Buf = NewStrBuf();
 452         serv_puts(bstr("g_cmd"));
 453         StrBuf_ServGetln(Buf);
 454         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 455         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 456
 457         switch (GetServerStatus(Buf, NULL)) {
 458         case 8:
 459                 serv_puts("\n\n000");
 460                 if ( (StrLength(Buf)==3) &&
 461                      !strcmp(ChrPtr(Buf), "000")) {
 462                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\000"), 0);
 463                         break;
 464                 }
 465         case 1:
 466                 while (!Done) {
 467                         StrBuf_ServGetlnBuffered(Buf);
 468                         if ( (StrLength(Buf)==3) &&
 469                              !strcmp(ChrPtr(Buf), "000")) {
 470                                 Done = 1;
 471                         }
 472                         StrBufAppendBuf(WCC->WBuf, Buf, 0);
 473                         StrBufAppendBufPlain(WCC->WBuf, HKEY("\n"), 0);
 474                 }
 475                 break;
 476         case 4:
 477                 text_to_server(bstr("g_input"));
 478                 serv_puts("000");
 479                 break;
 480         case 6:
 481                 len = atol(&ChrPtr(Buf)[4]);
 482                 StrBuf_ServGetBLOBBuffered(Buf, len);
 483                 break;
 484         case 7:
 485                 len = atol(&ChrPtr(Buf)[4]);
 486                 junk = malloc(len);
 487                 memset(junk, 0, len);
 488                 serv_write(junk, len);
 489                 free(junk);
 490         }
 491
 492         end_ajax_response();
 493
 494         /*
 495          * This is kind of an ugly hack, but this is the only place it can go.
 496          * If the command was GEXP, then the instant messenger window must be
 497          * running, so reset the "last_pager_check" watchdog timer so
 498          * that page_popup() doesn't try to open it a second time.
 499          */
 500         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 501                 WCC->last_pager_check = time(NULL);
 502         }
 503         FreeStrBuf(&Buf);
 504 }
 505
 506
 507 /*
 508  * Helper function for the asynchronous check to see if we need
 509  * to open the instant messenger window.
 510  */
 511 void seconds_since_last_gexp(void)
 512 {
 513         char buf[256];
 514
 515         if ( (time(NULL) - WC->last_pager_check) < 30) {
 516                 wprintf("NO\n");
 517         }
 518         else {
 519                 memset(buf, 0, 5);
 520                 serv_puts("NOOP");
 521                 serv_getln(buf, sizeof buf);
 522                 if (buf[3] == '*') {
 523                         wprintf("YES");
 524                 }
 525                 else {
 526                         wprintf("NO");
 527                 }
 528         }
 529 }
 530
 531 /**
 532  * \brief Detects a 'mobile' user agent
 533  */
 534 int is_mobile_ua(char *user_agent) {
 535       if (strstr(user_agent,"iPhone OS") != NULL) {
 536         return 1;
 537       } else if (strstr(user_agent,"Windows CE") != NULL) {
 538         return 1;
 539       } else if (strstr(user_agent,"SymbianOS") != NULL) {
 540         return 1;
 541       } else if (strstr(user_agent, "Opera Mobi") != NULL) {
 542         return 1;
 543       } else if (strstr(user_agent, "Firefox/2.0.0 Opera 9.51 Beta") != NULL) {
 544               /*  For some reason a new install of Opera 9.51beta decided to spoof. */
 545           return 1;
 546           }
 547       return 0;
 548 }
 549
 550
 551 /*
 552  * Entry point for WebCit transaction
 553  */
 554 void session_loop(HashList *HTTPHeaders,
 555                   StrBuf *ReqLine,
 556                   StrBuf *request_method,
 557                   StrBuf *ReadBuf,
 558                   const char **Pos)
 559 {
 560         StrBuf *Buf;
 561         const char *pch, *pchs, *pche;
 562         void *vLine;
 563         char action[1024];
 564         char arg[8][128];
 565         size_t sizes[10];
 566         char *index[10];
 567         char buf[SIZ];
 568         int a, nBackDots, nEmpty;
 569         int ContentLength = 0;
 570         StrBuf *ContentType = NULL;
 571         StrBuf *UrlLine = NULL;
 572         StrBuf *content = NULL;
 573         const char *content_end = NULL;
 574         StrBuf *browser_host = NULL;
 575         char user_agent[256];
 576         int body_start = 0;
 577         int is_static = 0;
 578         int n_static = 0;
 579         int len = 0;
 580         void *vHandler;
 581         WebcitHandler *Handler;
 582         struct timeval tx_start;
 583         struct timeval tx_finish;
 584
 585         /*
 586          * We stuff these with the values coming from the client cookies,
 587          * so we can use them to reconnect a timed out session if we have to.
 588          */
 589         StrBuf *c_username;
 590         StrBuf *c_password;
 591         StrBuf *c_roomname;
 592         char c_httpauth_string[SIZ];
 593         StrBuf *c_httpauth_user;
 594         StrBuf *c_httpauth_pass;
 595         wcsession *WCC;
 596
 597         gettimeofday(&tx_start, NULL);          /* start a stopwatch for performance timing */
 598
 599         Buf = NewStrBuf();
 600         c_username = NewStrBuf();
 601         c_password = NewStrBuf();
 602         c_roomname = NewStrBuf();
 603         safestrncpy(c_httpauth_string, "", sizeof c_httpauth_string);
 604         c_httpauth_user = NewStrBufPlain(HKEY(DEFAULT_HTTPAUTH_USER));
 605         c_httpauth_pass = NewStrBufPlain(HKEY(DEFAULT_HTTPAUTH_PASS));
 606
 607         WCC= WC;
 608         if (WCC->WBuf == NULL)
 609                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 610         FlushStrBuf(WCC->WBuf);
 611
 612         if (WCC->HBuf == NULL)
 613                 WCC->HBuf = NewStrBuf();
 614         FlushStrBuf(WCC->HBuf);
 615
 616         WCC->upload_length = 0;
 617         WCC->upload = NULL;
 618         WCC->is_mobile = 0;
 619         WCC->trailing_javascript = NewStrBuf();
 620         WCC->nWildfireHeaders = 0;
 621
 622         /** Figure out the action */
 623         index[0] = action;
 624         sizes[0] = sizeof action;
 625         for (a=1; a<9; a++)
 626         {
 627                 index[a] = arg[a-1];
 628                 sizes[a] = sizeof arg[a-1];
 629         }
 630         nBackDots = 0;
 631         nEmpty = 0;
 632         for ( a = 0; a < 9; ++a)
 633         {
 634                 extract_token(index[a], ChrPtr(ReqLine), a + 1, '/', sizes[a]);
 635                 if (strstr(index[a], "?")) *strstr(index[a], "?") = 0;
 636                 if (strstr(index[a], "&")) *strstr(index[a], "&") = 0;
 637                 if (strstr(index[a], " ")) *strstr(index[a], " ") = 0;
 638                 if ((index[a][0] == '.') && (index[a][1] == '.'))
 639                         nBackDots++;
 640                 if (index[a][0] == '\0')
 641                         nEmpty++;
 642         }
 643
 644
 645         if (GetHash(HTTPHeaders, HKEY("COOKIE"), &vLine) &&
 646             (vLine != NULL)){
 647                 cookie_to_stuff((StrBuf *)vLine, NULL,
 648                                 c_username,
 649                                 c_password,
 650                                 c_roomname);
 651         }
 652         if (GetHash(HTTPHeaders, HKEY("AUTHORIZATION"), &vLine) &&
 653             (vLine!=NULL)) {
 654                 StrBufDecodeBase64((StrBuf*)vLine);
 655                 StrBufExtract_token(c_httpauth_user, (StrBuf*)vLine, 0, ':');
 656                 StrBufExtract_token(c_httpauth_pass, (StrBuf*)vLine, 1, ':');
 657         }
 658         if (GetHash(HTTPHeaders, HKEY("CONTENT-LENGTH"), &vLine) &&
 659             (vLine!=NULL)) {
 660                 ContentLength = StrToi((StrBuf*)vLine);
 661         }
 662         if (GetHash(HTTPHeaders, HKEY("CONTENT-TYPE"), &vLine) &&
 663             (vLine!=NULL)) {
 664                 ContentType = (StrBuf*)vLine;
 665         }
 666         if (GetHash(HTTPHeaders, HKEY("USER-AGENT"), &vLine) &&
 667             (vLine!=NULL)) {
 668                 safestrncpy(user_agent, ChrPtr((StrBuf*)vLine), sizeof user_agent);
 669 #ifdef TECH_PREVIEW
 670                 if ((WCC->is_mobile < 0) && is_mobile_ua(&buf[12])) {
 671                         WCC->is_mobile = 1;
 672                 }
 673                 else {
 674                         WCC->is_mobile = 0;
 675                 }
 676 #endif
 677         }
 678         if ((follow_xff) &&
 679             GetHash(HTTPHeaders, HKEY("X-FORWARDED-HOST"), &vLine) &&
 680             (vLine != NULL)) {
 681                 WCC->http_host = (StrBuf*)vLine;
 682         }
 683         if ((StrLength(WCC->http_host) == 0) &&
 684             GetHash(HTTPHeaders, HKEY("HOST"), &vLine) &&
 685             (vLine!=NULL)) {
 686                 WCC->http_host = (StrBuf*)vLine;
 687         }
 688
 689         if (GetHash(HTTPHeaders, HKEY("X-FORWARDED-FOR"), &vLine) &&
 690             (vLine!=NULL)) {
 691                 browser_host = (StrBuf*) vLine;
 692
 693                 while (StrBufNum_tokens(browser_host, ',') > 1) {
 694                         StrBufRemove_token(browser_host, 0, ',');
 695                 }
 696                 StrBufTrim(browser_host);
 697         }
 698
 699         if (ContentLength > 0) {
 700                 content = NewStrBuf();
 701                 StrBufPrintf(content, "Content-type: %s\n"
 702                          "Content-length: %d\n\n",
 703                          ChrPtr(ContentType), ContentLength);
 704 /*
 705                 hprintf("Content-type: %s\n"
 706                         "Content-length: %d\n\n",
 707                         ContentType, ContentLength);
 708 */
 709                 body_start = StrLength(content);
 710
 711                 /** Read the entire input data at once. */
 712                 client_read_to(&WCC->http_sock,
 713                                content,
 714                                ReadBuf, Pos,
 715                                ContentLength,
 716                                SLEEPING);
 717
 718                 if (!strncasecmp(ChrPtr(ContentType), "application/x-www-form-urlencoded", 33)) {
 719                         StrBufCutLeft(content, body_start);
 720                         ParseURLParams(content);
 721                 } else if (!strncasecmp(ChrPtr(ContentType), "multipart", 9)) {
 722                         content_end = ChrPtr(content) + ContentLength + body_start;
 723                         mime_parser(ChrPtr(content), content_end, *upload_handler, NULL, NULL, NULL, 0);
 724                 }
 725         } else {
 726                 content = NULL;
 727         }
 728
 729         /* make a note of where we are in case the user wants to save it */
 730         WCC->this_page = NewStrBufDup(ReqLine);
 731         StrBufRemove_token(WCC->this_page, 2, ' ');
 732         StrBufRemove_token(WCC->this_page, 0, ' ');
 733
 734         /* If there are variables in the URL, we must grab them now */
 735         UrlLine = NewStrBufDup(ReqLine);
 736         len = StrLength(UrlLine);
 737         pch = pchs = ChrPtr(UrlLine);
 738         pche = pchs + len;
 739         while (pch < pche) {
 740                 if ((*pch == '?') || (*pch == '&')) {
 741                         StrBufCutLeft(UrlLine, pch - pchs + 1);
 742                         ParseURLParams(UrlLine);
 743                         break;
 744                 }
 745                 pch ++;
 746         }
 747         FreeStrBuf(&UrlLine);
 748
 749         /* If it's a "force 404" situation then display the error and bail. */
 750         if (!strcmp(action, "404")) {
 751                 hprintf("HTTP/1.1 404 Not found\r\n");
 752                 hprintf("Content-Type: text/plain\r\n");
 753                 wprintf("Not found\r\n");
 754                 end_burst();
 755                 goto SKIP_ALL_THIS_CRAP;
 756         }
 757
 758         /* Static content can be sent without connecting to Citadel. */
 759         is_static = 0;
 760         for (a=0; a<ndirs && ! is_static; ++a) {
 761                 if (!strcasecmp(action, (char*)static_content_dirs[a])) { /* map web to disk location */
 762                         is_static = 1;
 763                         n_static = a;
 764                 }
 765         }
 766         if (is_static) {
 767                 if (nBackDots < 2)
 768                 {
 769                         snprintf(buf, sizeof buf, "%s/%s/%s/%s/%s/%s/%s/%s",
 770                                  static_dirs[n_static],
 771                                  index[1], index[2], index[3], index[4], index[5], index[6], index[7]);
 772                         for (a=0; a<8; ++a) {
 773                                 if (buf[strlen(buf)-1] == '/') {
 774                                         buf[strlen(buf)-1] = 0;
 775                                 }
 776                         }
 777                         for (a = 0; a < strlen(buf); ++a) {
 778                                 if (isspace(buf[a])) {
 779                                         buf[a] = 0;
 780                                 }
 781                         }
 782                         output_static(buf);
 783                 }
 784                 else
 785                 {
 786                         lprintf(9, "Suspicious request. Ignoring.");
 787                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 788                         hprintf("Content-Type: text/plain\r\n\r\n");
 789                         wprintf("You have sent a malformed or invalid request.\r\n");
 790                         end_burst();
 791                 }
 792                 goto SKIP_ALL_THIS_CRAP;        /* Don't try to connect */
 793         }
 794
 795         /* If the client sent a nonce that is incorrect, kill the request. */
 796         if (strlen(bstr("nonce")) > 0) {
 797                 lprintf(9, "Comparing supplied nonce %s to session nonce %ld\n",
 798                         bstr("nonce"), WCC->nonce);
 799                 if (ibstr("nonce") != WCC->nonce) {
 800                         lprintf(9, "Ignoring request with mismatched nonce.\n");
 801                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 802                         hprintf("Content-Type: text/plain\r\n\r\n");
 803                         wprintf("Security check failed.\r\n");
 804                         end_burst();
 805                         goto SKIP_ALL_THIS_CRAP;
 806                 }
 807         }
 808
 809         /*
 810          * If we're not connected to a Citadel server, try to hook up the
 811          * connection now.
 812          */
 813         if (!WCC->connected) {
 814                 if (WCC->ReadBuf == NULL)
 815                         WCC->ReadBuf = NewStrBuf();
 816                 if (!strcasecmp(ctdlhost, "uds")) {
 817                         /* unix domain socket */
 818                         snprintf(buf, SIZ, "%s/citadel.socket", ctdlport);
 819                         WCC->serv_sock = uds_connectsock(buf);
 820                 }
 821                 else {
 822                         /* tcp socket */
 823                         WCC->serv_sock = tcp_connectsock(ctdlhost, ctdlport);
 824                 }
 825
 826                 if (WCC->serv_sock < 0) {
 827                         do_logout();
 828                         FreeStrBuf(&WCC->ReadBuf);
 829                         goto SKIP_ALL_THIS_CRAP;
 830                 }
 831                 else {
 832                         WCC->connected = 1;
 833                         serv_getln(buf, sizeof buf);    /* get the server greeting */
 834
 835                         /* Are there too many users already logged in? */
 836                         if (!strncmp(buf, "571", 3)) {
 837                                 wprintf(_("This server is already serving its maximum number of users and cannot accept any additional logins at this time.  Please try again later or contact your system administrator."));
 838                                 end_burst();
 839                                 end_webcit_session();
 840                                 goto SKIP_ALL_THIS_CRAP;
 841                         }
 842
 843                         /*
 844                          * From what host is our user connecting?  Go with
 845                          * the host at the other end of the HTTP socket,
 846                          * unless we are following X-Forwarded-For: headers
 847                          * and such a header has already turned up something.
 848                          */
 849                         if ( (!follow_xff) || (StrLength(browser_host) == 0) ) {
 850                                 if (browser_host == NULL) {
 851                                         browser_host = NewStrBuf();
 852                                         Put(HTTPHeaders, HKEY("FreeMeWithTheOtherHeaders"),
 853                                             browser_host, HFreeStrBuf);
 854                                 }
 855                                 locate_host(browser_host, WCC->http_sock);
 856                         }
 857                         if (WCC->serv_info == NULL)
 858                                 WCC->serv_info = get_serv_info(browser_host, user_agent);
 859                         if (WCC->serv_info == NULL){
 860                                 begin_burst();
 861                                 wprintf(_("Received unexpected answer from Citadel "
 862                                           "server; bailing out."));
 863                                 hprintf("HTTP/1.1 200 OK\r\n");
 864                                 hprintf("Content-type: text/plain; charset=utf-8\r\n");
 865                                 end_burst();
 866                                 end_webcit_session();
 867                                 goto SKIP_ALL_THIS_CRAP;
 868                         }
 869                         if (WCC->serv_info->serv_rev_level < MINIMUM_CIT_VERSION) {
 870                                 begin_burst();
 871                                 wprintf(_("You are connected to a Citadel "
 872                                         "server running Citadel %d.%02d. \n"
 873                                         "In order to run this version of WebCit "
 874                                         "you must also have Citadel %d.%02d or"
 875                                         " newer.\n\n\n"),
 876                                                 WCC->serv_info->serv_rev_level / 100,
 877                                                 WCC->serv_info->serv_rev_level % 100,
 878                                                 MINIMUM_CIT_VERSION / 100,
 879                                                 MINIMUM_CIT_VERSION % 100
 880                                         );
 881                                 hprintf("HTTP/1.1 200 OK\r\n");
 882                                 hprintf("Content-type: text/plain; charset=utf-8\r\n");
 883                                 end_burst();
 884                                 end_webcit_session();
 885                                 goto SKIP_ALL_THIS_CRAP;
 886                         }
 887                 }
 888         }
 889
 890         /*
 891          * Functions which can be performed without logging in
 892          */
 893         if (!strcasecmp(action, "listsub")) {
 894                 do_listsub();
 895                 goto SKIP_ALL_THIS_CRAP;
 896         }
 897         if (!strcasecmp(action, "freebusy")) {
 898                 do_freebusy(ChrPtr(ReqLine));
 899                 goto SKIP_ALL_THIS_CRAP;
 900         }
 901
 902         /*
 903          * If we're not logged in, but we have HTTP Authentication data,
 904          * try logging in to Citadel using that.
 905          */
 906         if ((!WCC->logged_in)
 907             && (StrLength(c_httpauth_user) > 0)
 908             && (StrLength(c_httpauth_pass) > 0))
 909         {
 910                 FlushStrBuf(Buf);
 911                 serv_printf("USER %s", ChrPtr(c_httpauth_user));
 912                 StrBuf_ServGetln(Buf);
 913                 if (GetServerStatus(Buf, NULL) == 3) {
 914                         serv_printf("PASS %s", ChrPtr(c_httpauth_pass));
 915                         StrBuf_ServGetln(Buf);
 916                         if (GetServerStatus(Buf, NULL) == 2) {
 917                                 become_logged_in(c_httpauth_user,
 918                                                 c_httpauth_pass, Buf);
 919                                 if (WCC->httpauth_user == NULL)
 920                                         WCC->httpauth_user = NewStrBufDup(c_httpauth_user);
 921                                 else {
 922                                         FlushStrBuf(WCC->httpauth_user);
 923                                         StrBufAppendBuf(WCC->httpauth_user, c_httpauth_user, 0);
 924                                 }
 925                                 if (WCC->httpauth_pass == NULL)
 926                                         WCC->httpauth_pass = NewStrBufDup(c_httpauth_pass);
 927                                 else {
 928                                         FlushStrBuf(WCC->httpauth_pass);
 929                                         StrBufAppendBuf(WCC->httpauth_pass, c_httpauth_pass, 0);
 930                                 }
 931                         } else {
 932                                 /* Should only display when password is wrong */
 933                                 authorization_required(&buf[4]);
 934                                 FreeStrBuf(&Buf);
 935                                 goto SKIP_ALL_THIS_CRAP;
 936                         }
 937                 }
 938         }
 939
 940         /* This needs to run early */
 941 #ifdef TECH_PREVIEW
 942         if (!strcasecmp(action, "rss")) {
 943                 display_rss(sbstr("room"), request_method);
 944                 goto SKIP_ALL_THIS_CRAP;
 945         }
 946 #endif
 947
 948         /*
 949          * The GroupDAV stuff relies on HTTP authentication instead of
 950          * our session's authentication.
 951          */
 952         if (!strncasecmp(action, "groupdav", 8)) {
 953                 groupdav_main(HTTPHeaders,
 954                               ReqLine, request_method,
 955                               ContentType, /* do GroupDAV methods */
 956                               ContentLength, content, body_start);
 957                 if (!WCC->logged_in) {
 958                         WCC->killthis = 1;      /* If not logged in, don't */
 959                 }                               /* keep the session active */
 960                 goto SKIP_ALL_THIS_CRAP;
 961         }
 962
 963
 964         /*
 965          * Automatically send requests with any method other than GET or
 966          * POST to the GroupDAV code as well.
 967          */
 968         if ((strcasecmp(ChrPtr(request_method), "GET")) && (strcasecmp(ChrPtr(request_method), "POST"))) {
 969                 groupdav_main(HTTPHeaders, ReqLine,
 970                               request_method, ContentType, /** do GroupDAV methods */
 971                               ContentLength, content, body_start);
 972                 if (!WCC->logged_in) {
 973                         WCC->killthis = 1;      /** If not logged in, don't */
 974                 }                               /** keep the session active */
 975                 goto SKIP_ALL_THIS_CRAP;
 976         }
 977
 978         /*
 979          * If we're not logged in, but we have username and password cookies
 980          * supplied by the browser, try using them to log in.
 981          */
 982         if ((!WCC->logged_in)
 983            && (StrLength(c_username)>0)
 984            && (StrLength(c_password)>0)) {
 985                 serv_printf("USER %s", ChrPtr(c_username));
 986                 StrBuf_ServGetln(Buf);
 987                 if (GetServerStatus(Buf, NULL) == 3) {
 988                         serv_printf("PASS %s", ChrPtr(c_password));
 989                         StrBuf_ServGetln(Buf);
 990                         if (GetServerStatus(Buf, NULL) == 2) {
 991                                 become_logged_in(c_username, c_password, Buf);
 992                                 get_preference("default_header_charset", &WCC->DefaultCharset);
 993                         }
 994                 }
 995         }
 996
 997         /*
 998          * If a 'gotofirst' parameter has been specified, attempt to goto that room
 999          * prior to doing anything else.
1000          */
1001         if (havebstr("gotofirst")) {
1002                 gotoroom(sbstr("gotofirst"));   /* do this quietly to avoid session output! */
1003         }
1004
1005         /*
1006          * If we don't have a current room, but a cookie specifying the
1007          * current room is supplied, make an effort to go there.
1008          */
1009         if ((StrLength(WCC->wc_roomname) == 0) && (StrLength(c_roomname) > 0)) {
1010                 serv_printf("GOTO %s", ChrPtr(c_roomname));
1011                 StrBuf_ServGetln(Buf);
1012                 if (GetServerStatus(Buf, NULL) == 2) {
1013                         if (WCC->wc_roomname == NULL) {
1014                                 WCC->wc_roomname = NewStrBufDup(c_roomname);
1015                         }
1016                         else {
1017                                 FlushStrBuf(WCC->wc_roomname);
1018                                 StrBufAppendBuf(WCC->wc_roomname, c_roomname, 0);
1019                         }
1020                 }
1021         }
1022
1023         GetHash(HandlerHash, action, strlen(action) /* TODO*/, &vHandler),
1024                 Handler = (WebcitHandler*) vHandler;
1025         if (Handler != NULL) {
1026                 if (!WCC->logged_in && ((Handler->Flags & ANONYMOUS) == 0)) {
1027                         display_login(NULL);
1028                 }
1029                 else {
1030                         if((Handler->Flags & NEED_URL)) {
1031                                 if (WCC->UrlFragment1 == NULL)
1032                                         WCC->UrlFragment1 = NewStrBuf();
1033                                 if (WCC->UrlFragment2 == NULL)
1034                                         WCC->UrlFragment2 = NewStrBuf();
1035                                 if (WCC->UrlFragment3 == NULL)
1036                                         WCC->UrlFragment3 = NewStrBuf();
1037                                 if (WCC->UrlFragment4 == NULL)
1038                                         WCC->UrlFragment4 = NewStrBuf();
1039                                 StrBufPlain(WCC->UrlFragment1, index[0], -1);
1040                                 StrBufPlain(WCC->UrlFragment2, index[1], -1);
1041                                 StrBufPlain(WCC->UrlFragment3, index[2], -1);
1042                                 StrBufPlain(WCC->UrlFragment4, index[3], -1);
1043                         }
1044                         if ((Handler->Flags & AJAX) != 0)
1045                                 begin_ajax_response();
1046                         Handler->F();
1047                         if ((Handler->Flags & AJAX) != 0)
1048                                 end_ajax_response();
1049                 }
1050         }
1051         /* When all else fais, display the main menu. */
1052         else {
1053                 if (!WCC->logged_in)
1054                         display_login(NULL);
1055                 else
1056                         display_main_menu();
1057         }
1058
1059 SKIP_ALL_THIS_CRAP:
1060         if (WCC->SavePrefsToServer) {
1061                 save_preferences();
1062                 WCC->SavePrefsToServer = 0;
1063         }
1064         FreeStrBuf(&Buf);
1065         FreeStrBuf(&c_username);
1066         FreeStrBuf(&c_password);
1067         FreeStrBuf(&c_roomname);
1068         FreeStrBuf(&c_httpauth_user);
1069         FreeStrBuf(&c_httpauth_pass);
1070         FreeStrBuf(&WCC->this_page);
1071         fflush(stdout);
1072         if (content != NULL) {
1073                 FreeStrBuf(&content);
1074                 content = NULL;
1075         }
1076         DeleteHash(&WCC->urlstrings);
1077         if (WCC->upload_length > 0) {
1078                 free(WCC->upload);
1079                 WCC->upload_length = 0;
1080         }
1081         FreeStrBuf(&WCC->trailing_javascript);
1082         WCC->http_host = NULL;
1083
1084         /* How long did this transaction take? */
1085         gettimeofday(&tx_finish, NULL);
1086
1087         lprintf(9, "Transaction completed in %ld.%06ld seconds.\n",
1088                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
1089                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000
1090         );
1091 }
1092
1093
1094 /*
1095  * Replacement for sleep() that uses select() in order to avoid SIGALRM
1096  */
1097 void sleeeeeeeeeep(int seconds)
1098 {
1099         struct timeval tv;
1100
1101         tv.tv_sec = seconds;
1102         tv.tv_usec = 0;
1103         select(0, NULL, NULL, NULL, &tv);
1104 }
1105
1106
1107 int ConditionalImportantMesage(StrBuf *Target, WCTemplputParams *TP)
1108 {
1109         wcsession *WCC = WC;
1110         if (WCC != NULL)
1111                 return (!IsEmptyStr(WCC->ImportantMessage));
1112         else
1113                 return 0;
1114 }
1115
1116 void tmplput_importantmessage(StrBuf *Target, WCTemplputParams *TP)
1117 {
1118         wcsession *WCC = WC;
1119
1120         if (WCC != NULL) {
1121 /*
1122                 StrBufAppendTemplate(Target, nArgs, Tokens, Context, ContextType,
1123                                      WCC->ImportantMessage, 0);
1124 */
1125                 StrEscAppend(Target, NULL, WCC->ImportantMessage, 0, 0);
1126                 WCC->ImportantMessage[0] = '\0';
1127         }
1128 }
1129
1130 void tmplput_trailing_javascript(StrBuf *Target, WCTemplputParams *TP)
1131 {
1132         wcsession *WCC = WC;
1133
1134         if (WCC != NULL)
1135                 StrBufAppendTemplate(Target, TP, WCC->trailing_javascript, 0);
1136 }
1137
1138 void tmplput_csslocal(StrBuf *Target, WCTemplputParams *TP)
1139 {
1140         extern StrBuf *csslocal;
1141         StrBufAppendBuf(Target,
1142                         csslocal, 0);
1143 }
1144
1145
1146
1147
1148 void
1149 InitModule_WEBCIT
1150 (void)
1151 {
1152         WebcitAddUrlHandler(HKEY("blank"), blank_page, ANONYMOUS);
1153         WebcitAddUrlHandler(HKEY("do_template"), url_do_template, ANONYMOUS);
1154         WebcitAddUrlHandler(HKEY("sslg"), seconds_since_last_gexp, AJAX);
1155         WebcitAddUrlHandler(HKEY("ajax_servcmd"), ajax_servcmd, 0);
1156
1157         RegisterConditional(HKEY("COND:IMPMSG"), 0, ConditionalImportantMesage, CTX_NONE);
1158         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, CTX_NONE);
1159         RegisterNamespace("IMPORTANTMESSAGE", 0, 0, tmplput_importantmessage, CTX_NONE);
1160         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, CTX_NONE);
1161 }