webcit/webcit.c

   1 // This is the main transaction loop of the web service.  It maintains a
   2 // persistent session to the Citadel server, handling HTTP WebCit requests as
   3 // they arrive and presenting a user interface.
   4 //
   5 // Copyright (c) 1996-2021 by the citadel.org team
   6 //
   7 // This program is open source software.  You can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License, version 3.
   9
  10
  11 #define SHOW_ME_VAPPEND_PRINTF
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14 #include "webcit.h"
  15 #include "dav.h"
  16 #include "webserver.h"
  17
  18 StrBuf *csslocal = NULL;
  19 HashList *HandlerHash = NULL;
  20
  21 void stuff_to_cookie(int unset_cookie);
  22 extern int GetConnected(void);
  23 extern int verbose;
  24
  25 void PutRequestLocalMem(void *Data, DeleteHashDataFunc DeleteIt) {
  26         int n;
  27
  28         n = GetCount(WC->Hdr->HTTPHeaders);
  29         Put(WC->Hdr->HTTPHeaders, IKEY(n), Data, DeleteIt);
  30 }
  31
  32 void DeleteWebcitHandler(void *vHandler) {
  33         WebcitHandler *Handler = (WebcitHandler *) vHandler;
  34         FreeStrBuf(&Handler->Name);
  35         FreeStrBuf(&Handler->DisplayName);
  36         free(Handler);
  37 }
  38
  39 void WebcitAddUrlHandler(const char *UrlString, long UrlSLen, const char *DisplayName, long dslen, WebcitHandlerFunc F, long Flags) {
  40         WebcitHandler *NewHandler;
  41         NewHandler = (WebcitHandler *) malloc(sizeof(WebcitHandler));
  42         NewHandler->F = F;
  43         NewHandler->Flags = Flags;
  44         NewHandler->Name = NewStrBufPlain(UrlString, UrlSLen);
  45         StrBufShrinkToFit(NewHandler->Name, 1);
  46         NewHandler->DisplayName = NewStrBufPlain(DisplayName, dslen);
  47         StrBufShrinkToFit(NewHandler->DisplayName, 1);
  48         Put(HandlerHash, UrlString, UrlSLen, NewHandler, DeleteWebcitHandler);
  49 }
  50
  51 void tmplput_HANDLER_DISPLAYNAME(StrBuf * Target, WCTemplputParams * TP) {
  52         if (WC->Hdr->HR.Handler != NULL)
  53                 StrBufAppendTemplate(Target, TP, WC->Hdr->HR.Handler->DisplayName, 0);
  54 }
  55
  56
  57 /*
  58  * web-printing funcion. uses our vsnprintf wrapper
  59  */
  60 #ifdef UBER_VERBOSE_DEBUGGING
  61 void wcc_printf(const char *FILE, const char *FUNCTION, long LINE, const char *format, ...)
  62 #else
  63 void wc_printf(const char *format, ...)
  64 #endif
  65 {
  66         va_list arg_ptr;
  67
  68         if (WC->WBuf == NULL)
  69                 WC->WBuf = NewStrBuf();
  70 #ifdef UBER_VERBOSE_DEBUGGING
  71         StrBufAppendPrintf(WC->WBuf, "\n%s:%s:%d[", FILE, FUNCTION, LINE);
  72 #endif
  73
  74         va_start(arg_ptr, format);
  75         StrBufVAppendPrintf(WC->WBuf, format, arg_ptr);
  76         va_end(arg_ptr);
  77 #ifdef UBER_VERBOSE_DEBUGGING
  78         StrBufAppendPrintf(WC->WBuf, "]\n");
  79 #endif
  80 }
  81
  82 /*
  83  * http-header-printing funcion. uses our vsnprintf wrapper
  84  */
  85 void hprintf(const char *format, ...) {
  86         va_list arg_ptr;
  87
  88         va_start(arg_ptr, format);
  89         StrBufVAppendPrintf(WC->HBuf, format, arg_ptr);
  90         va_end(arg_ptr);
  91 }
  92
  93
  94
  95 /*
  96  * wrap up an HTTP session, closes tags, etc.
  97  *
  98  * print_standard_html_footer should be set to:
  99  * 0            - to transmit only,
 100  * nonzero      - to append the closing tags
 101  */
 102 void wDumpContent(int print_standard_html_footer) {
 103         if (print_standard_html_footer) {
 104                 wc_printf("</div> <!-- end of 'content' div -->\n");
 105                 do_template("trailing");
 106         }
 107
 108         /* If we've been saving it all up for one big output burst,
 109          * go ahead and do that now.
 110          */
 111         end_burst();
 112 }
 113
 114
 115
 116
 117 /*
 118  * Output HTTP headers and leading HTML for a page
 119  */
 120 void output_headers(int do_httpheaders, /* 1 = output HTTP headers                        */
 121                     int do_htmlhead,    /* 1 = output HTML <head> section and <body> opener */
 122                     int do_room_banner, /* 1 = include the room banner and <div id="content"></div> */
 123                     int unset_cookies,  /* 1 = session is terminating, so unset the cookies */
 124                     int suppress_check, /* 1 = suppress check for instant messages        */
 125                     int cache   /* 1 = allow browser to cache this page      */
 126     ) {
 127         char httpnow[128];
 128
 129         if (WC->isFailure)
 130                 hprintf("HTTP/2.2 500 Internal Server Error");
 131         else if (WC->Hdr->HaveRange > 1)
 132                 hprintf("HTTP/1.1 206 Partial Content\r\n");
 133         else
 134                 hprintf("HTTP/1.1 200 OK\r\n");
 135
 136         http_datestring(httpnow, sizeof httpnow, time(NULL));
 137
 138         if (do_httpheaders) {
 139                 if (WC->serv_info != NULL)
 140                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 141                                 "Server: %s / %s\n" "Connection: close\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 142                 else
 143                         hprintf("Content-type: text/html; charset=utf-8\r\n"
 144                                 "Server: %s / [n/a]\n" "Connection: close\r\n", PACKAGE_STRING);
 145         }
 146
 147         if (cache > 0) {
 148                 char httpTomorow[128];
 149
 150                 http_datestring(httpTomorow, sizeof httpTomorow, time(NULL) + 60 * 60 * 24 * 2);
 151
 152                 hprintf("Pragma: public\r\n"
 153                         "Cache-Control: max-age=3600, must-revalidate\r\n"
 154                         "Last-modified: %s\r\n" "Expires: %s\r\n", httpnow, httpTomorow);
 155         }
 156         else {
 157                 hprintf("Pragma: no-cache\r\n" "Cache-Control: no-store\r\n" "Expires: -1\r\n");
 158         }
 159
 160         if (cache < 2)
 161                 stuff_to_cookie(unset_cookies);
 162
 163         if (do_htmlhead) {
 164                 begin_burst();
 165                 do_template("head");
 166                 if ((WC->logged_in) && (!unset_cookies)) {
 167                         DoTemplate(HKEY("paging"), NULL, &NoCtx);
 168                 }
 169                 if (do_room_banner) {
 170                         tmplput_roombanner(NULL, NULL);
 171                 }
 172         }
 173
 174         if (do_room_banner) {
 175                 wc_printf("<div id=\"content\">\n");
 176         }
 177 }
 178
 179 void output_custom_content_header(const char *ctype) {
 180         hprintf("HTTP/1.1 200 OK\r\n");
 181         hprintf("Content-type: %s; charset=utf-8\r\n", ctype);
 182         hprintf("Server: %s / %s\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software));
 183         hprintf("Connection: close\r\n");
 184 }
 185
 186
 187 /*
 188  * Generic function to do an HTTP redirect.  Easy and fun.
 189  */
 190 void http_redirect(const char *whichpage) {
 191         hprintf("HTTP/1.1 302 Moved Temporarily\n");
 192         hprintf("Location: %s\r\n", whichpage);
 193         hprintf("URI: %s\r\n", whichpage);
 194         hprintf("Content-type: text/html; charset=utf-8\r\n");
 195         stuff_to_cookie(0);
 196         begin_burst();
 197         wc_printf("<html><body>");
 198         wc_printf("Go <a href=\"%s\">here</A>.", whichpage);
 199         wc_printf("</body></html>\n");
 200         end_burst();
 201 }
 202
 203
 204
 205 /*
 206  * Output a piece of content to the web browser using conformant HTTP and MIME semantics.
 207  *
 208  * If this function is called, it is expected that begin_burst() has already been called
 209  * and some sort of content has been fed into the buffer.  This function will transmit a
 210  * bunch of headers to the client.  end_burst() will add some headers of its own, and then
 211  * transmit the buffered content to the client.
 212  */
 213 void http_transmit_thing(const char *content_type, int is_static) {
 214         if (verbose)
 215                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 216         output_headers(0, 0, 0, 0, 0, is_static);
 217
 218         hprintf("Content-type: %s\r\n" "Server: %s\r\n" "Connection: close\r\n", content_type, PACKAGE_STRING);
 219
 220         end_burst();
 221 }
 222
 223 void http_transmit_headers(const char *content_type, int is_static, long is_chunked, int is_gzip) {
 224         if (verbose)
 225                 syslog(LOG_DEBUG, "http_transmit_thing(%s)%s", content_type, ((is_static > 0) ? " (static)" : ""));
 226         output_headers(0, 0, 0, 0, 0, is_static);
 227
 228         if (is_gzip)
 229                 hprintf("Content-encoding: gzip\r\n");
 230
 231         if (WC->Hdr->HaveRange)
 232                 hprintf("Accept-Ranges: bytes\r\n"
 233                         "Content-Range: bytes %ld-%ld/%ld\r\n", WC->Hdr->RangeStart, WC->Hdr->RangeTil, WC->Hdr->TotalBytes);
 234
 235         hprintf("Content-type: %s\r\n"
 236                 "Server: " PACKAGE_STRING "\r\n"
 237                 "%s" "Connection: close\r\n\r\n", content_type, (is_chunked) ? "Transfer-Encoding: chunked\r\n" : "");
 238 }
 239
 240
 241 /*
 242  * Convenience functions to display a page containing only a string
 243  *
 244  * titlebarcolor        color of the titlebar of the frame
 245  * titlebarmsg          text to display in the title bar
 246  * messagetext          body of the box
 247  */
 248 void convenience_page(const char *titlebarcolor, const char *titlebarmsg, const char *messagetext) {
 249         hprintf("HTTP/1.1 200 OK\n");
 250         output_headers(1, 1, 1, 0, 0, 0);
 251         wc_printf("<div id=\"room_banner_override\">\n");
 252         wc_printf("<table width=100%% border=0 bgcolor=\"#%s\"><tr><td>", titlebarcolor);
 253         wc_printf("<span class=\"titlebar\">%s</span>\n", titlebarmsg);
 254         wc_printf("</td></tr></table>\n");
 255         wc_printf("</div>\n<div id=\"content\">\n");
 256         escputs(messagetext);
 257         wc_printf("<hr />\n");
 258         wDumpContent(1);
 259 }
 260
 261
 262 /*
 263  * Display a blank page.
 264  */
 265 void blank_page(void) {
 266         output_headers(1, 1, 0, 0, 0, 0);
 267         wDumpContent(2);
 268 }
 269
 270
 271 /*
 272  * A template has been requested
 273  */
 274 void url_do_template(void) {
 275         const StrBuf *MimeType;
 276         const StrBuf *Tmpl = sbstr("template");
 277         begin_burst();
 278         MimeType = DoTemplate(SKEY(Tmpl), NULL, &NoCtx);
 279         http_transmit_thing(ChrPtr(MimeType), 0);
 280 }
 281
 282
 283
 284 /*
 285  * convenience function to indicate success
 286  */
 287 void display_success(const char *successmessage) {
 288         convenience_page("007700", "OK", successmessage);
 289 }
 290
 291
 292 /*
 293  * Authorization required page (sends a 401, causing the browser to request login credentials)
 294  */
 295 void authorization_required(void) {
 296         const char *message = "";
 297
 298         hprintf("HTTP/1.1 401 Authorization Required\r\n");
 299         hprintf("Server: %s / %s\r\n" "Connection: close\r\n", PACKAGE_STRING, ChrPtr(WC->serv_info->serv_software)
 300             );
 301         hprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n", ChrPtr(WC->serv_info->serv_humannode));
 302
 303         /* if this is a false cookie authentication, remove it to avoid endless loops. */
 304         if (StrLength(WC->Hdr->HR.RawCookie) > 0)
 305                 stuff_to_cookie(1);
 306
 307         hprintf("Content-Type: text/html\r\n");
 308         begin_burst();
 309         wc_printf("<h1>");
 310         wc_printf(_("Authorization Required"));
 311         wc_printf("</h1>\r\n");
 312
 313         if (WC->ImportantMsg != NULL) {
 314                 message = ChrPtr(WC->ImportantMsg);
 315         }
 316
 317         wc_printf(_("The resource you requested requires a valid username and password. "
 318                     "You could not be logged in: %s\n"), message);
 319         wDumpContent(0);
 320 }
 321
 322
 323 /*
 324  * Convenience functions to wrap around asynchronous ajax responses
 325  */
 326 void begin_ajax_response(void) {
 327
 328         FlushStrBuf(WC->HBuf);
 329         output_headers(0, 0, 0, 0, 0, 0);
 330
 331         hprintf("Content-type: text/html; charset=UTF-8\r\n" "Server: %s\r\n" "Connection: close\r\n", PACKAGE_STRING);
 332         begin_burst();
 333 }
 334
 335
 336 /*
 337  * print ajax response footer
 338  */
 339 void end_ajax_response(void) {
 340         wDumpContent(0);
 341 }
 342
 343
 344 /*
 345  * Wraps a Citadel server command in an AJAX transaction.
 346  */
 347 void ajax_servcmd(void) {
 348         int Done = 0;
 349         StrBuf *Buf;
 350         char *junk;
 351         size_t len;
 352
 353         if (verbose) {
 354                 syslog(LOG_DEBUG, "ajax_servcmd() g_cmd=\"%s\"", bstr("g_cmd"));
 355         }
 356         begin_ajax_response();
 357         Buf = NewStrBuf();
 358         serv_puts(bstr("g_cmd"));
 359         StrBuf_ServGetln(Buf);
 360         StrBufAppendBuf(WC->WBuf, Buf, 0);
 361         StrBufAppendBufPlain(WC->WBuf, HKEY("\n"), 0);
 362
 363         switch (GetServerStatus(Buf, NULL)) {
 364         case 8:
 365                 serv_puts("\n\n000");
 366                 if ((StrLength(Buf) == 3) && !strcmp(ChrPtr(Buf), "000")) {
 367                         StrBufAppendBufPlain(WC->WBuf, HKEY("\000"), 0);
 368                         break;
 369                 }
 370         case 1:
 371                 while (!Done) {
 372                         if (StrBuf_ServGetln(Buf) < 0)
 373                                 break;
 374                         if ((StrLength(Buf) == 3) && !strcmp(ChrPtr(Buf), "000")) {
 375                                 Done = 1;
 376                         }
 377                         StrBufAppendBuf(WC->WBuf, Buf, 0);
 378                         StrBufAppendBufPlain(WC->WBuf, HKEY("\n"), 0);
 379                 }
 380                 break;
 381         case 4:
 382                 text_to_server(bstr("g_input"));
 383                 serv_puts("000");
 384                 break;
 385         case 6:
 386                 len = atol(&ChrPtr(Buf)[4]);
 387                 StrBuf_ServGetBLOBBuffered(Buf, len);
 388                 break;
 389         case 7:
 390                 len = atol(&ChrPtr(Buf)[4]);
 391                 junk = malloc(len);
 392                 memset(junk, 0, len);
 393                 serv_write(junk, len);
 394                 free(junk);
 395         }
 396
 397         end_ajax_response();
 398
 399         /*
 400          * This is kind of an ugly hack, but this is the only place it can go.
 401          * If the command was GEXP, then the instant messenger window must be
 402          * running, so reset the "last_pager_check" watchdog timer so
 403          * that page_popup() doesn't try to open it a second time. TODO: page_popup isn't with us anymore.
 404          */
 405         if (!strncasecmp(bstr("g_cmd"), "GEXP", 4)) {
 406                 WC->last_pager_check = time(NULL);
 407         }
 408         FreeStrBuf(&Buf);
 409 }
 410
 411
 412 /*
 413  * Helper function for the asynchronous check to see if we need
 414  * to open the instant messenger window.
 415  */
 416 void seconds_since_last_gexp(void) {
 417         char buf[256];
 418
 419         if ((time(NULL) - WC->last_pager_check) < 30) {
 420                 wc_printf("NO\n");
 421         }
 422         else {
 423                 memset(buf, 0, 5);
 424                 serv_puts("NOOP");
 425                 serv_getln(buf, sizeof buf);
 426                 if (buf[3] == '*') {
 427                         wc_printf("YES");
 428                 }
 429                 else {
 430                         wc_printf("NO");
 431                 }
 432         }
 433 }
 434
 435
 436 /*
 437  * Save a URL destination so we can go to it later
 438  */
 439 void push_destination(void) {
 440
 441         if (!WC) {
 442                 wc_printf("no session");
 443                 return;
 444         }
 445
 446         FreeStrBuf(&WC->PushedDestination);
 447         WC->PushedDestination = NewStrBufDup(sbstr("url"));
 448         if (verbose)
 449                 syslog(LOG_DEBUG, "Push: %s", ChrPtr(WC->PushedDestination));
 450         wc_printf("OK");
 451 }
 452
 453
 454 /*
 455  * Go to the URL saved by push_destination()
 456  */
 457 void pop_destination(void) {
 458         /*
 459          * If we are in the middle of a new user signup, the server may request that
 460          * we first pass through a registration screen.
 461          */
 462         if ((WC) && (WC->need_regi)) {
 463                 if ((WC->PushedDestination != NULL) && (StrLength(WC->PushedDestination) > 0)) {
 464                         /* Registering will take us to the My Citadel Config room, so save our place */
 465                         StrBufAppendBufPlain(WC->PushedDestination, HKEY("?go="), 0);
 466                         StrBufUrlescAppend(WC->PushedDestination, WC->CurRoom.name, NULL);
 467                 }
 468                 WC->need_regi = 0;
 469                 display_reg(1);
 470                 return;
 471         }
 472
 473         /*
 474          * Do something reasonable if we somehow ended up requesting a pop without
 475          * having first done a push.
 476          */
 477         if ((!WC) || (WC->PushedDestination == NULL) || (StrLength(WC->PushedDestination) == 0)) {
 478                 do_welcome();
 479                 return;
 480         }
 481
 482         /*
 483          * All righty then!  We have a destination saved, so go there now.
 484          */
 485         if (verbose) {
 486                 syslog(LOG_DEBUG, "Pop: %s", ChrPtr(WC->PushedDestination));
 487         }
 488         http_redirect(ChrPtr(WC->PushedDestination));
 489 }
 490
 491
 492 int ReadPostData(void) {
 493         int rc;
 494         int urlencoded_post = 0;
 495         StrBuf *content = NULL;
 496
 497         urlencoded_post = (strncasecmp(ChrPtr(WC->Hdr->HR.ContentType), "application/x-www-form-urlencoded", 33) == 0);
 498
 499         content = NewStrBufPlain(NULL, WC->Hdr->HR.ContentLength + 256);
 500
 501         if (!urlencoded_post) {
 502                 StrBufPrintf(content,
 503                              "Content-type: %s\n"
 504                              "Content-length: %ld\n\n", ChrPtr(WC->Hdr->HR.ContentType), WC->Hdr->HR.ContentLength);
 505         }
 506
 507         /* Read the entire input data at once. */
 508         rc = client_read_to(WC->Hdr, content, WC->Hdr->HR.ContentLength, SLEEPING);
 509         if (rc < 0) {
 510                 return rc;
 511         }
 512
 513         if (urlencoded_post) {
 514                 ParseURLParams(content);
 515         }
 516         else if (!strncasecmp(ChrPtr(WC->Hdr->HR.ContentType), "multipart", 9)) {
 517                 char *Buf;
 518                 char *BufEnd;
 519                 long len;
 520
 521                 len = StrLength(content);
 522                 Buf = SmashStrBuf(&content);
 523                 BufEnd = Buf + len;
 524                 mime_parser(Buf, BufEnd, *upload_handler, NULL, NULL, NULL, 0);
 525                 free(Buf);
 526         }
 527         else if (WC->Hdr->HR.ContentLength > 0) {
 528                 WC->upload = content;
 529                 WC->upload_length = StrLength(WC->upload);
 530                 content = NULL;
 531         }
 532         FreeStrBuf(&content);
 533         return 1;
 534 }
 535
 536
 537 int Conditional_REST_DEPTH(StrBuf * Target, WCTemplputParams * TP) {
 538         long Depth, IsDepth;
 539         long offset = 0;
 540
 541         if (WC->Hdr->HR.Handler != NULL)
 542                 offset++;
 543         Depth = GetTemplateTokenNumber(Target, TP, 2, 0);
 544         IsDepth = GetCount(WC->Directory) + offset;
 545
 546 //      LogTemplateError(Target, "bla", 1, TP, "REST_DEPTH: %ld : %ld\n", Depth, IsDepth);
 547         if (Depth < 0) {
 548                 Depth = -Depth;
 549                 return IsDepth > Depth;
 550         }
 551         else
 552                 return Depth == IsDepth;
 553 }
 554
 555
 556
 557 /*
 558  * Entry point for WebCit transaction
 559  */
 560 void session_loop(void) {
 561         int xhttp;
 562         StrBuf *Buf;
 563
 564         /*
 565          * We stuff these with the values coming from the client cookies,
 566          * so we can use them to reconnect a timed out session if we have to.
 567          */
 568         WC->upload_length = 0;
 569         WC->upload = NULL;
 570         WC->Hdr->nWildfireHeaders = 0;
 571
 572         if (WC->Hdr->HR.ContentLength > 0) {
 573                 if (ReadPostData() < 0) {
 574                         return;
 575                 }
 576         }
 577
 578         Buf = NewStrBuf();
 579         WC->trailing_javascript = NewStrBuf();
 580
 581         /* Convert base64-encoded URL's back to plain text */
 582         if (!strncmp(ChrPtr(WC->Hdr->this_page), "/B64", 4)) {
 583                 StrBufCutLeft(WC->Hdr->this_page, 4);
 584                 StrBufDecodeBase64(WC->Hdr->this_page);
 585                 http_redirect(ChrPtr(WC->Hdr->this_page));
 586                 goto SKIP_ALL_THIS_CRAP;
 587         }
 588
 589         /* If there are variables in the URL, we must grab them now */
 590         if (WC->Hdr->PlainArgs != NULL) {
 591                 ParseURLParams(WC->Hdr->PlainArgs);
 592         }
 593
 594         /* If the client sent a nonce that is incorrect, kill the request. */
 595         if (havebstr("nonce")) {
 596                 if (verbose) {
 597                         syslog(LOG_DEBUG, "Comparing supplied nonce %s to session nonce %d", bstr("nonce"), WC->nonce);
 598                 }
 599                 if (ibstr("nonce") != WC->nonce) {
 600                         syslog(LOG_INFO, "Ignoring request with mismatched nonce.");
 601                         hprintf("HTTP/1.1 404 Security check failed\r\n");
 602                         hprintf("Content-Type: text/plain\r\n");
 603                         begin_burst();
 604                         wc_printf("Security check failed.\r\n");
 605                         end_burst();
 606                         goto SKIP_ALL_THIS_CRAP;
 607                 }
 608         }
 609
 610         /*
 611          * If we're not connected to a Citadel server, try to hook up the connection now.
 612          */
 613         if (!WC->connected) {
 614                 if (GetConnected()) {
 615                         hprintf("HTTP/1.1 503 Service Unavailable\r\n");
 616                         hprintf("Content-Type: text/html\r\n");
 617                         begin_burst();
 618                         wc_printf("<html><head><title>503 Service Unavailable</title></head><body>\n");
 619                         wc_printf(_("This program was unable to connect or stay "
 620                                     "connected to the Citadel server.  Please report " "this problem to your system administrator.")
 621                             );
 622                         wc_printf("<br>");
 623                         wc_printf("<a href=\"http://www.citadel.org/doku.php/"
 624                                   "faq:generalquestions:webcit_unable_to_connect\">%s</a>", _("Read More...")
 625                             );
 626                         wc_printf("</body></html>\n");
 627                         end_burst();
 628                         goto SKIP_ALL_THIS_CRAP;
 629                 }
 630         }
 631
 632         /*
 633          * If we're not logged in, but we have authentication data (either from
 634          * a cookie or from http-auth), try logging in to Citadel using that.
 635          */
 636         if ((!WC->logged_in)
 637             && (StrLength(WC->Hdr->c_username) > 0)
 638             && (StrLength(WC->Hdr->c_password) > 0)
 639             ) {
 640                 long Status;
 641
 642                 FlushStrBuf(Buf);
 643                 serv_printf("USER %s", ChrPtr(WC->Hdr->c_username));
 644                 StrBuf_ServGetln(Buf);
 645                 if (GetServerStatus(Buf, &Status) == 3) {
 646                         serv_printf("PASS %s", ChrPtr(WC->Hdr->c_password));
 647                         StrBuf_ServGetln(Buf);
 648                         if (GetServerStatus(Buf, NULL) == 2) {
 649                                 become_logged_in(WC->Hdr->c_username, WC->Hdr->c_password, Buf);
 650                         }
 651                         else {
 652                                 /* Should only display when password is wrong */
 653                                 WC->ImportantMsg = NewStrBufPlain(ChrPtr(Buf) + 4, StrLength(Buf) - 4);
 654                                 authorization_required();
 655                                 FreeStrBuf(&Buf);
 656                                 goto SKIP_ALL_THIS_CRAP;
 657                         }
 658                 }
 659                 else if (Status == 541) {
 660                         WC->logged_in = 1;
 661                 }
 662         }
 663
 664         xhttp = (WC->Hdr->HR.eReqType != eGET) && (WC->Hdr->HR.eReqType != ePOST) && (WC->Hdr->HR.eReqType != eHEAD);
 665
 666         /*
 667          * If a 'go' (or 'gotofirst') parameter has been specified, attempt to goto that room
 668          * prior to doing anything else.
 669          */
 670         if (havebstr("go")) {
 671                 int ret;
 672                 if (verbose)
 673                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 674                 ret = gotoroom(sbstr("go"));    /* do quietly to avoid session output! */
 675                 if ((ret / 100) != 2) {
 676                         if (verbose)
 677                                 syslog(LOG_DEBUG, "Unable to change to [%s]; Reason: %d", bstr("go"), ret);
 678                 }
 679         }
 680         else if (havebstr("gotofirst")) {
 681                 int ret;
 682                 if (verbose)
 683                         syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("gotofirst"));
 684                 ret = gotoroom(sbstr("gotofirst"));     /* do quietly to avoid session output! */
 685                 if ((ret / 100) != 2) {
 686                         syslog(LOG_INFO, "Unable to change to [%s]; Reason: %d", bstr("gotofirst"), ret);
 687                 }
 688         }
 689
 690         /*
 691          * If we aren't in any room yet, but we have cookie data telling us where we're
 692          * supposed to be, and 'go' was not specified, then go there.
 693          */
 694         else if ((StrLength(WC->CurRoom.name) == 0) && ((StrLength(WC->Hdr->c_roomname) > 0))) {
 695                 int ret;
 696
 697                 if (verbose)
 698                         syslog(LOG_DEBUG, "We are in '%s' but cookie indicates '%s', going there...",
 699                                ChrPtr(WC->CurRoom.name), ChrPtr(WC->Hdr->c_roomname)
 700                             );
 701                 ret = gotoroom(WC->Hdr->c_roomname);    /* do quietly to avoid session output! */
 702                 if ((ret / 100) != 2) {
 703                         if (verbose)
 704                                 syslog(LOG_DEBUG, "COOKIEGOTO: Unable to change to [%s]; Reason: %d",
 705                                        ChrPtr(WC->Hdr->c_roomname), ret);
 706                 }
 707         }
 708
 709         if (WC->Hdr->HR.Handler != NULL) {
 710                 if ((!WC->logged_in)
 711                     && ((WC->Hdr->HR.Handler->Flags & ANONYMOUS) == 0)
 712                     && (WC->serv_info != NULL)
 713                     && (WC->serv_info->serv_supports_guest == 0)
 714                     ) {
 715                         display_login();
 716                 }
 717                 else {
 718                         if ((WC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 719                                 begin_ajax_response();
 720                         }
 721                         WC->Hdr->HR.Handler->F();
 722                         if ((WC->Hdr->HR.Handler->Flags & AJAX) != 0) {
 723                                 end_ajax_response();
 724                         }
 725                 }
 726         }
 727         /* When all else fails, display the default landing page or a main menu. */
 728         else {
 729                 /*
 730                  * ordinary browser users get a nice login screen, DAV etc. requsets
 731                  * are given a 401 so they can handle it appropriate.
 732                  */
 733                 if (!WC->logged_in) {
 734                         if (xhttp) {
 735                                 authorization_required();
 736                         }
 737                         else {
 738                                 display_default_landing_page();
 739                         }
 740                 }
 741                 /*
 742                  * Toplevel dav requests? or just a flat browser request?
 743                  */
 744                 else {
 745                         if (xhttp) {
 746                                 dav_main();
 747                         }
 748                         else {
 749                                 display_main_menu();
 750                         }
 751                 }
 752         }
 753
 754       SKIP_ALL_THIS_CRAP:
 755         FreeStrBuf(&Buf);
 756         fflush(stdout);
 757 }
 758
 759
 760
 761 /*
 762  * Display the appropriate landing page for this site.
 763  */
 764 void display_default_landing_page(void) {
 765         if (WC && WC->serv_info && WC->serv_info->serv_supports_guest) {
 766                 /* default action */
 767
 768                 if (havebstr("go")) {
 769                         if (verbose)
 770                                 syslog(LOG_DEBUG, "Explicit room selection: %s", bstr("go"));
 771                         smart_goto(sbstr("go"));
 772                 }
 773                 else if (default_landing_page) {
 774                         http_redirect(default_landing_page);
 775                 }
 776                 else {
 777                         StrBuf *teh_lobby = NewStrBufPlain(HKEY("_BASEROOM_"));
 778                         smart_goto(teh_lobby);
 779                         FreeStrBuf(&teh_lobby);
 780                 }
 781         }
 782         else {
 783                 display_login();
 784         }
 785 }
 786
 787
 788 /*
 789  * Replacement for sleep() that uses select() in order to avoid SIGALRM
 790  */
 791 void sleeeeeeeeeep(int seconds) {
 792         struct timeval tv;
 793
 794         tv.tv_sec = seconds;
 795         tv.tv_usec = 0;
 796         select(0, NULL, NULL, NULL, &tv);
 797 }
 798
 799 int Conditional_IS_HTTPS(StrBuf * Target, WCTemplputParams * TP) {
 800         return is_https != 0;
 801 }
 802
 803 void AppendImportantMessage(const char *pch, long len) {
 804
 805         if (StrLength(WC->ImportantMsg) > 0) {
 806                 StrBufAppendBufPlain(WC->ImportantMsg, HKEY("\n"), 0);
 807         }
 808
 809         StrBufAppendBufPlain(WC->ImportantMsg, pch, len, 0);
 810 }
 811
 812 int ConditionalImportantMesage(StrBuf * Target, WCTemplputParams * TP) {
 813         if (WC != NULL) {
 814                 return (StrLength(WC->ImportantMsg) > 0);
 815         }
 816         else {
 817                 return 0;
 818         }
 819 }
 820
 821 void tmplput_importantmessage(StrBuf * Target, WCTemplputParams * TP) {
 822
 823         if (WC != NULL) {
 824                 if (StrLength(WC->ImportantMsg) > 0) {
 825                         StrBufAppendTemplate(Target, TP, WC->ImportantMsg, 0);
 826                 }
 827         }
 828 }
 829
 830 void tmplput_trailing_javascript(StrBuf * Target, WCTemplputParams * TP) {
 831
 832         if (WC != NULL) {
 833                 StrBufAppendTemplate(Target, TP, WC->trailing_javascript, 0);
 834         }
 835 }
 836
 837 void tmplput_csslocal(StrBuf * Target, WCTemplputParams * TP) {
 838         StrBufAppendBuf(Target, csslocal, 0);
 839 }
 840
 841 void tmplput_packagestring(StrBuf * Target, WCTemplputParams * TP) {
 842         StrBufAppendBufPlain(Target, HKEY(PACKAGE_STRING), 0);
 843 }
 844
 845 extern char static_local_dir[PATH_MAX];
 846
 847
 848 void InitModule_WEBCIT(void) {
 849         char dir[SIZ];
 850         WebcitAddUrlHandler(HKEY("blank"), "", 0, blank_page, ANONYMOUS | COOKIEUNNEEDED | ISSTATIC);
 851         WebcitAddUrlHandler(HKEY("landing"), "", 0, display_default_landing_page, ANONYMOUS | COOKIEUNNEEDED);
 852         WebcitAddUrlHandler(HKEY("do_template"), "", 0, url_do_template, ANONYMOUS);
 853         WebcitAddUrlHandler(HKEY("sslg"), "", 0, seconds_since_last_gexp, AJAX | LOGCHATTY);
 854         WebcitAddUrlHandler(HKEY("ajax_servcmd"), "", 0, ajax_servcmd, 0);
 855         WebcitAddUrlHandler(HKEY("webcit"), "", 0, blank_page, URLNAMESPACE);
 856         WebcitAddUrlHandler(HKEY("push"), "", 0, push_destination, AJAX);
 857         WebcitAddUrlHandler(HKEY("pop"), "", 0, pop_destination, 0);
 858
 859         WebcitAddUrlHandler(HKEY("401"), "", 0, authorization_required, ANONYMOUS | COOKIEUNNEEDED);
 860         RegisterConditional("COND:IMPMSG", 0, ConditionalImportantMesage, CTX_NONE);
 861         RegisterConditional("COND:REST:DEPTH", 0, Conditional_REST_DEPTH, CTX_NONE);
 862         RegisterConditional("COND:IS_HTTPS", 0, Conditional_IS_HTTPS, CTX_NONE);
 863
 864         RegisterNamespace("CSSLOCAL", 0, 0, tmplput_csslocal, NULL, CTX_NONE);
 865         RegisterNamespace("IMPORTANTMESSAGE", 0, 1, tmplput_importantmessage, NULL, CTX_NONE);
 866         RegisterNamespace("TRAILING_JAVASCRIPT", 0, 0, tmplput_trailing_javascript, NULL, CTX_NONE);
 867         RegisterNamespace("URL:DISPLAYNAME", 0, 1, tmplput_HANDLER_DISPLAYNAME, NULL, CTX_NONE);
 868         RegisterNamespace("PACKAGESTRING", 0, 1, tmplput_packagestring, NULL, CTX_NONE);
 869
 870
 871         snprintf(dir, SIZ, "%s/webcit.css", static_local_dir);
 872         if (!access(dir, R_OK)) {
 873                 syslog(LOG_INFO, "Using local Stylesheet [%s]", dir);
 874                 csslocal = NewStrBufPlain(HKEY("<link href=\"static.local/webcit.css\" rel=\"stylesheet\" type=\"text/css\" />"));
 875         }
 876         else
 877                 syslog(LOG_INFO, "No Site-local Stylesheet [%s] installed.", dir);
 878
 879 }
 880
 881 void ServerStartModule_WEBCIT(void) {
 882         HandlerHash = NewHash(1, NULL);
 883 }
 884
 885
 886 void ServerShutdownModule_WEBCIT(void) {
 887         FreeStrBuf(&csslocal);
 888         DeleteHash(&HandlerHash);
 889 }
 890
 891
 892
 893 void SessionNewModule_WEBCIT(wcsession * sess) {
 894         sess->ImportantMsg = NewStrBuf();
 895         sess->WBuf = NewStrBufPlain(NULL, SIZ * 4);
 896         sess->HBuf = NewStrBufPlain(NULL, SIZ / 4);
 897 }
 898
 899 void SessionDetachModule_WEBCIT(wcsession * sess) {
 900         DeleteHash(&sess->Directory);
 901
 902         FreeStrBuf(&sess->upload);
 903         sess->upload_length = 0;
 904
 905         FreeStrBuf(&sess->trailing_javascript);
 906
 907         if (StrLength(sess->WBuf) > SIZ * 30) { /* Bigger than 120K? release. */
 908                 FreeStrBuf(&sess->WBuf);
 909                 sess->WBuf = NewStrBuf();
 910         }
 911         else
 912                 FlushStrBuf(sess->WBuf);
 913         FlushStrBuf(sess->HBuf);
 914         if (StrLength(sess->ImportantMsg) > 0) {
 915                 FlushStrBuf(sess->ImportantMsg);
 916         }
 917
 918 }
 919
 920 void
 921  SessionDestroyModule_WEBCIT(wcsession * sess) {
 922         FreeStrBuf(&sess->WBuf);
 923         FreeStrBuf(&sess->HBuf);
 924         FreeStrBuf(&sess->ImportantMsg);
 925         FreeStrBuf(&sess->PushedDestination);
 926 }