webcit/context_loop.c

   1 /*
   2  * $Id$
   3  *
   4  * This is the other half of the webserver.  It handles the task of hooking
   5  * up HTTP requests with the sessions they belong to, using HTTP cookies to
   6  * keep track of things.  If the HTTP request doesn't belong to any currently
   7  * active session, a new session is started.
   8  *
   9  */
  10
  11 #include "webcit.h"
  12 #include "webserver.h"
  13
  14 /* Only one thread may manipulate SessionList at a time... */
  15 pthread_mutex_t SessionListMutex;
  16
  17 struct wcsession *SessionList = NULL; /**< our sessions ????*/
  18
  19 pthread_key_t MyConKey;         /**< TSD key for MySession() */
  20
  21
  22 /*
  23  * free the memory used for viewing atachments
  24  */
  25 void free_attachment(void *vattach) {
  26         wc_attachment *att = (wc_attachment*) vattach;
  27         FreeStrBuf(&att->content_type);
  28         FreeStrBuf(&att->filename);
  29         free(att->data);
  30         free(att);
  31 }
  32
  33
  34 void DestroySession(struct wcsession **sessions_to_kill)
  35 {
  36         close((*sessions_to_kill)->serv_sock);
  37         close((*sessions_to_kill)->chat_sock);
  38 //              if ((*sessions_to_kill)->preferences != NULL) {
  39 //                      free((*sessions_to_kill)->preferences);
  40 //              }
  41         if ((*sessions_to_kill)->cache_fold != NULL) {
  42                 free((*sessions_to_kill)->cache_fold);
  43         }
  44         DeleteHash(&((*sessions_to_kill)->attachments));
  45         free_march_list((*sessions_to_kill));
  46         DeleteHash(&((*sessions_to_kill)->hash_prefs));
  47         DeleteHash(&((*sessions_to_kill)->IconBarSetttings));
  48         DeleteHash(&((*sessions_to_kill)->ServCfg));
  49         FreeStrBuf(&((*sessions_to_kill)->UrlFragment1));
  50         FreeStrBuf(&((*sessions_to_kill)->UrlFragment2));
  51         FreeStrBuf(&((*sessions_to_kill)->UrlFragment3));
  52         FreeStrBuf(&((*sessions_to_kill)->WBuf));
  53         FreeStrBuf(&((*sessions_to_kill)->HBuf));
  54         FreeStrBuf(&((*sessions_to_kill)->CLineBuf));
  55         free((*sessions_to_kill));
  56         (*sessions_to_kill) = NULL;
  57 }
  58
  59 void shutdown_sessions(void)
  60 {
  61         struct wcsession *sptr;
  62
  63         for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
  64                         sptr->killthis = 1;
  65         }
  66 }
  67
  68 void do_housekeeping(void)
  69 {
  70         struct wcsession *sptr, *ss;
  71         struct wcsession *sessions_to_kill = NULL;
  72         int num_sessions = 0;
  73         static int num_threads = MIN_WORKER_THREADS;
  74
  75         /**
  76          * Lock the session list, moving any candidates for euthanasia into
  77          * a separate list.
  78          */
  79         pthread_mutex_lock(&SessionListMutex);
  80         num_sessions = 0;
  81         for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
  82                 ++num_sessions;
  83
  84                 /** Kill idle sessions */
  85                 if ((time(NULL) - (sptr->lastreq)) >
  86                    (time_t) WEBCIT_TIMEOUT) {
  87                         sptr->killthis = 1;
  88                 }
  89
  90                 /** Remove sessions flagged for kill */
  91                 if (sptr->killthis) {
  92
  93                         /** remove session from linked list */
  94                         if (sptr == SessionList) {
  95                                 SessionList = SessionList->next;
  96                         }
  97                         else for (ss=SessionList;ss!=NULL;ss=ss->next) {
  98                                 if (ss->next == sptr) {
  99                                         ss->next = ss->next->next;
 100                                 }
 101                         }
 102
 103                         sptr->next = sessions_to_kill;
 104                         sessions_to_kill = sptr;
 105                 }
 106         }
 107         pthread_mutex_unlock(&SessionListMutex);
 108
 109         /**
 110          * Now free up and destroy the culled sessions.
 111          */
 112         while (sessions_to_kill != NULL) {
 113                 lprintf(3, "Destroying session %d\n", sessions_to_kill->wc_session);
 114                 pthread_mutex_lock(&sessions_to_kill->SessionMutex);
 115                 pthread_mutex_unlock(&sessions_to_kill->SessionMutex);
 116                 sptr = sessions_to_kill->next;
 117
 118                 DestroySession(&sessions_to_kill);
 119                 sessions_to_kill = sptr;
 120                 --num_sessions;
 121         }
 122
 123         /**
 124          * If there are more sessions than threads, then we should spawn
 125          * more threads ... up to a predefined maximum.
 126          */
 127         while ( (num_sessions > num_threads)
 128               && (num_threads <= MAX_WORKER_THREADS) ) {
 129                 spawn_another_worker_thread();
 130                 ++num_threads;
 131                 lprintf(3, "There are %d sessions and %d threads active.\n",
 132                         num_sessions, num_threads);
 133         }
 134 }
 135
 136
 137 /**
 138  * \brief Wake up occasionally and clean house
 139  */
 140 void housekeeping_loop(void)
 141 {
 142         while (1) {
 143                 sleeeeeeeeeep(HOUSEKEEPING);
 144                 do_housekeeping();
 145         }
 146 }
 147
 148
 149 /**
 150  * \brief Create a Session id
 151  * Generate a unique WebCit session ID (which is not the same thing as the
 152  * Citadel session ID).
 153  *
 154  * \todo FIXME ... ensure that session number is truly unique
 155  *
 156  */
 157 int GenerateSessionID(void)
 158 {
 159         static int seq = (-1);
 160
 161         if (seq < 0) {
 162                 seq = (int) time(NULL);
 163         }
 164
 165         return ++seq;
 166 }
 167
 168
 169 /*
 170  * Collapse multiple cookies on one line
 171  */
 172 ////int req_gets(int *sock, char *buf, char *hold, size_t hlen)
 173 ////{
 174 ////    int a, b;
 175 ////
 176 ////    if (IsEmptyStr(hold)) {
 177 ////            strcpy(buf, "");
 178 ////            a = client_getln(sock, buf, SIZ);
 179 ////            if (a<1) return(-1);
 180 ////    } else {
 181 ////            safestrncpy(buf, hold, SIZ);
 182 ////    }
 183 ////    strcpy(hold, "");
 184 ////
 185 ////    if (!strncasecmp(buf, "Cookie: ", 8)) {
 186 ////            int len;
 187 ////            len = strlen(buf);
 188 ////            for (a = 0; a < len; ++a)
 189 ////                    if (buf[a] == ';') {
 190 ////                            // we don't refresh len, because of we
 191 ////                            // only exit from here.
 192 ////                            snprintf(hold, hlen, "Cookie: %s", &buf[a + 1]);
 193 ////                            buf[a] = 0;
 194 ////                            b = 8;
 195 ////                            while (isspace(hold[b]))
 196 ////                                    b++;
 197 ////
 198 ////                            memmove(&hold[8], &hold[b], len - b + 1);
 199 ////                            return(0);
 200 ////                    }
 201 ////    }
 202 ////
 203 ////    return(0);
 204 ////}
 205
 206
 207 /*
 208  * Collapse multiple cookies on one line
 209  */
 210 int ReqGetStrBuf(int *sock, StrBuf *Target, StrBuf *buf)
 211 {
 212
 213         return ClientGetLine(sock, Target, buf);
 214 }
 215
 216
 217
 218 /*
 219  * lingering_close() a`la Apache. see
 220  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 221  */
 222 int lingering_close(int fd)
 223 {
 224         char buf[SIZ];
 225         int i;
 226         fd_set set;
 227         struct timeval tv, start;
 228
 229         gettimeofday(&start, NULL);
 230         shutdown(fd, 1);
 231         do {
 232                 do {
 233                         gettimeofday(&tv, NULL);
 234                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 235                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 236                         if (tv.tv_usec < 0) {
 237                                 tv.tv_sec--;
 238                                 tv.tv_usec += 1000000;
 239                         }
 240                         FD_ZERO(&set);
 241                         FD_SET(fd, &set);
 242                         i = select(fd + 1, &set, NULL, NULL, &tv);
 243                 } while (i == -1 && errno == EINTR);
 244
 245                 if (i <= 0)
 246                         break;
 247
 248                 i = read(fd, buf, sizeof buf);
 249         } while (i != 0 && (i != -1 || errno == EINTR));
 250
 251         return close(fd);
 252 }
 253
 254
 255
 256 /**
 257  * \brief       sanity requests
 258  *              Check for bogus requests coming from brain-dead Windows boxes.
 259  *
 260  * \param       http_cmd        The HTTP request to check
 261  */
 262 int is_bogus(StrBuf *http_cmd) {
 263         const char *url;
 264         int i, max;
 265
 266         url = ChrPtr(http_cmd);
 267         if (IsEmptyStr(url)) return(1);
 268         ++url;
 269
 270         char *bogus_prefixes[] = {
 271                 "/scripts/root.exe",    /**< Worms and trojans and viruses, oh my! */
 272                 "/c/winnt",
 273                 "/MSADC/",
 274                 "/_vti",                /**< Broken Microsoft DAV implementation */
 275                 "/MSOffice"             /**< Stoopid MSOffice thinks everyone is IIS */
 276         };
 277
 278         max = sizeof(bogus_prefixes) / sizeof(char *);
 279
 280         for (i=0; i<max; ++i) {
 281                 if (!strncasecmp(url, bogus_prefixes[i], strlen(bogus_prefixes[i]))) {
 282                         return(2);
 283                 }
 284         }
 285
 286         return(0);      /* probably ok */
 287 }
 288
 289
 290 const char *nix(void *vptr) {return ChrPtr( (StrBuf*)vptr);}
 291
 292 /**
 293  * \brief handle one request
 294  * This loop gets called once for every HTTP connection made to WebCit.  At
 295  * this entry point we have an HTTP socket with a browser allegedly on the
 296  * other end, but we have not yet bound to a WebCit session.
 297  *
 298  * The job of this function is to locate the correct session and bind to it,
 299  * or create a session if necessary and bind to it, then run the WebCit
 300  * transaction loop.  Afterwards, we unbind from the session.  When this
 301  * function returns, the worker thread is then free to handle another
 302  * transaction.
 303  * \param sock the socket we will put our answer to
 304  */
 305 void context_loop(int *sock)
 306 {
 307         const char *buf;
 308         int desired_session = 0;
 309         int got_cookie = 0;
 310         int gzip_ok = 0;
 311         struct wcsession *TheSession, *sptr;
 312         char httpauth_string[1024];
 313         char httpauth_user[1024];
 314         char httpauth_pass[1024];
 315         char *ptr = NULL;
 316         int session_is_new = 0;
 317         int nLine = 0;
 318         int LineLen;
 319         void *vLine;
 320         StrBuf *Buf, *Line, *LastLine, *HeaderName, *ReqLine, *ReqType, *HTTPVersion;
 321         StrBuf *accept_language = NULL;
 322         const char *pch, *pchs, *pche;
 323         HashList *HTTPHeaders;
 324
 325         strcpy(httpauth_string, "");
 326         strcpy(httpauth_user, DEFAULT_HTTPAUTH_USER);
 327         strcpy(httpauth_pass, DEFAULT_HTTPAUTH_PASS);
 328
 329         /**
 330          * Find out what it is that the web browser is asking for
 331          */
 332         HeaderName = NewStrBuf();
 333         Buf = NewStrBuf();
 334         LastLine = NULL;
 335         HTTPHeaders = NewHash(1, NULL);
 336         /**
 337          * Read in the request
 338          */
 339         do {
 340                 nLine ++;
 341                 Line = NewStrBuf();
 342                 if (ReqGetStrBuf(sock, Line, Buf) < 0) return;
 343
 344                 LineLen = StrLength(Line);
 345
 346                 if (nLine == 1) {
 347                         ReqLine = Line;
 348                         continue;
 349                 }
 350                 if (LineLen == 0) {
 351                         FreeStrBuf(&Line);
 352                         continue;
 353                 }
 354
 355                 /** Do we need to Unfold? */
 356                 if ((LastLine != NULL) &&
 357                     (isspace(*ChrPtr(Line)))) {
 358                         pch = pchs = ChrPtr(Line);
 359                         pche = pchs + StrLength(Line);
 360                         while (isspace(*pch) && (pch < pche))
 361                                 pch ++;
 362                         StrBufCutLeft(Line, pch - pchs);
 363                         StrBufAppendBuf(LastLine, Line, 0);
 364                         FreeStrBuf(&Line);
 365                         continue;
 366                 }
 367
 368                 StrBufExtract_token(HeaderName, Line, 0, ':');
 369         //// TODO: filter bad chars!
 370
 371                 pchs = ChrPtr(Line);
 372                 pch = pchs + StrLength(HeaderName) + 1;
 373                 pche = pchs + StrLength(Line);
 374                 while (isspace(*pch) && (pch < pche))
 375                         pch ++;
 376                 StrBufCutLeft(Line, pch - pchs);
 377
 378                 StrBufUpCase(HeaderName);
 379                 Put(HTTPHeaders, SKEY(HeaderName), Line, HFreeStrBuf);
 380                 LastLine = Line;
 381         } while (LineLen > 0);
 382         FreeStrBuf(&HeaderName);
 383
 384 ////    dbg_PrintHash(HTTPHeaders, nix, NULL);
 385
 386
 387         /**
 388          * Can we compress?
 389          */
 390         if (GetHash(HTTPHeaders, HKEY("ACCEPT-ENCODING"), &vLine) &&
 391             (vLine != NULL)) {
 392                 buf = ChrPtr((StrBuf*)vLine);
 393                 if (strstr(&buf[16], "gzip")) {
 394                         gzip_ok = 1;
 395                 }
 396         }
 397
 398         /**
 399          * Browser-based sessions use cookies for session
 400
 401 authentication
 402          */
 403         if (GetHash(HTTPHeaders, HKEY("COOKIE"), &vLine) &&
 404             (vLine != NULL)) {
 405                 cookie_to_stuff(vLine, &desired_session,
 406                                 NULL, 0, NULL, 0, NULL, 0);
 407                 got_cookie = 1;
 408         }
 409
 410         /**
 411          * GroupDAV-based sessions use HTTP authentication
 412          */
 413         if (GetHash(HTTPHeaders, HKEY("AUTHORIZATION"), &vLine) &&
 414             (vLine != NULL)) {
 415                 Line = (StrBuf*)vLine;
 416                 if (strncasecmp(ChrPtr(Line), "Basic", 5) == 0) {
 417                         StrBufCutLeft(Line, 6);
 418                         CtdlDecodeBase64(httpauth_string, ChrPtr(Line), StrLength(Line));
 419                         extract_token(httpauth_user, httpauth_string, 0, ':', sizeof httpauth_user);
 420                         extract_token(httpauth_pass, httpauth_string, 1, ':', sizeof httpauth_pass);
 421                 }
 422                 else
 423                         lprintf(1, "Authentication scheme not supported! [%s]\n", ChrPtr(Line));
 424         }
 425
 426         if (GetHash(HTTPHeaders, HKEY("IF-MODIFIED-SINCE"), &vLine) &&
 427             (vLine != NULL)) {
 428                 if_modified_since = httpdate_to_timestamp((StrBuf*)vLine);
 429         }
 430
 431         if (GetHash(HTTPHeaders, HKEY("ACCEPT-LANGUAGE"), &vLine) &&
 432             (vLine != NULL)) {
 433                 accept_language = (StrBuf*) vLine;
 434         }
 435
 436
 437         /**
 438          * If the request is prefixed by "/webcit" then chop that off.  This
 439          * allows a front end web server to forward all /webcit requests to us
 440          * while still using the same web server port for other things.
 441          */
 442
 443         ReqType = NewStrBuf();
 444         HTTPVersion = NewStrBuf();
 445         StrBufExtract_token(HTTPVersion, ReqLine, 2, ' ');
 446         StrBufExtract_token(ReqType, ReqLine, 0, ' ');
 447         StrBufCutLeft(ReqLine, StrLength(ReqType) + 1);
 448         StrBufCutRight(ReqLine, StrLength(HTTPVersion) + 1);
 449
 450         if ((follow_xff == 1) && (StrLength(ReqLine) >= 8) &&
 451             (ptr = strstr(ChrPtr(ReqLine), "/webcit/"), /*< Handle "/webcit/" */
 452              (ptr != NULL))) {
 453                 StrBufCutLeft(ReqLine, 7);
 454         }
 455
 456         /** Begin parsing the request. */
 457 #ifdef TECH_PREVIEW
 458         if ((strncmp(ChrPtr(ReqLine), "/sslg", 5) != 0) &&
 459             (strncmp(ChrPtr(ReqLine), "/static/", 8) != 0) &&
 460             (strncmp(ChrPtr(ReqLine), "/tiny_mce/", 10) != 0) &&
 461             (strncmp(ChrPtr(ReqLine), "/wholist_section", 16) != 0) &&
 462             (strstr(ChrPtr(ReqLine), "wholist_section") == NULL)) {
 463 #endif
 464                 lprintf(5, "HTTP: %s %s %s\n", ChrPtr(ReqType), ChrPtr(ReqLine), ChrPtr(HTTPVersion));
 465 #ifdef TECH_PREVIEW
 466         }
 467 #endif
 468
 469         /** Check for bogus requests */
 470         if ((StrLength(HTTPVersion) == 0) ||
 471             (StrLength(ReqType) == 0) ||
 472             is_bogus(ReqLine)) {
 473                 StrBufPlain(ReqLine, HKEY("/404 HTTP/1.1"));
 474                 StrBufPlain(ReqType, HKEY("GET"));
 475         }
 476         FreeStrBuf(&HTTPVersion);
 477
 478         /**
 479          * While we're at it, gracefully handle requests for the
 480          * robots.txt and favicon.ico files.
 481          */
 482         if (!strncasecmp(ChrPtr(ReqLine), "/robots.txt", 11)) {
 483                 StrBufPlain(ReqLine,
 484                             HKEY("/static/robots.txt"
 485                                  "?force_close_session=yes HTTP/1.1"));
 486                 StrBufPlain(ReqType, HKEY("GET"));
 487         }
 488         else if (!strncasecmp(ChrPtr(ReqLine), "/favicon.ico", 12)) {
 489                 StrBufPlain(ReqLine, HKEY("/static/favicon.ico"));
 490                 StrBufPlain(ReqType, HKEY("GET"));
 491         }
 492
 493         /**
 494          * These are the URL's which may be executed without a
 495          * session cookie already set.  If it's not one of these,
 496          * force the session to close because cookies are
 497          * probably disabled on the client browser.
 498          */
 499         else if ( (StrLength(ReqLine) > 1 )
 500                 && (strncasecmp(ChrPtr(ReqLine), "/listsub", 8))
 501                 && (strncasecmp(ChrPtr(ReqLine), "/freebusy", 9))
 502                 && (strncasecmp(ChrPtr(ReqLine), "/do_logout", 10))
 503                 && (strncasecmp(ChrPtr(ReqLine), "/groupdav", 9))
 504                 && (strncasecmp(ChrPtr(ReqLine), "/static", 7))
 505                 && (strncasecmp(ChrPtr(ReqLine), "/rss", 4))
 506                 && (strncasecmp(ChrPtr(ReqLine), "/404", 4))
 507                 && (got_cookie == 0)) {
 508                 StrBufPlain(ReqLine,
 509                             HKEY("/static/nocookies.html"
 510                                  "?force_close_session=yes"));
 511         }
 512
 513         /**
 514          * See if there's an existing session open with the desired ID or user/pass
 515          */
 516         TheSession = NULL;
 517
 518         if (TheSession == NULL) {
 519                 pthread_mutex_lock(&SessionListMutex);
 520                 for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
 521
 522                         /** If HTTP-AUTH, look for a session with matching credentials */
 523                         if ( (!IsEmptyStr(httpauth_user))
 524                            &&(!strcasecmp(sptr->httpauth_user, httpauth_user))
 525                            &&(!strcasecmp(sptr->httpauth_pass, httpauth_pass)) ) {
 526                                 TheSession = sptr;
 527                         }
 528
 529                         /** If cookie-session, look for a session with matching session ID */
 530                         if ( (desired_session != 0) && (sptr->wc_session == desired_session)) {
 531                                 TheSession = sptr;
 532                         }
 533
 534                 }
 535                 pthread_mutex_unlock(&SessionListMutex);
 536         }
 537
 538         /**
 539          * Create a new session if we have to
 540          */
 541         if (TheSession == NULL) {
 542                 lprintf(3, "Creating a new session\n");
 543                 TheSession = (struct wcsession *)
 544                         malloc(sizeof(struct wcsession));
 545                 memset(TheSession, 0, sizeof(struct wcsession));
 546                 TheSession->serv_sock = (-1);
 547                 TheSession->chat_sock = (-1);
 548
 549                 /* If we're recreating a session that expired, it's best to give it the same
 550                  * session number that it had before.  The client browser ought to pick up
 551                  * the new session number and start using it, but in some rare situations it
 552                  * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
 553                  * to get created.
 554                  */
 555                 if (desired_session == 0) {
 556                         TheSession->wc_session = GenerateSessionID();
 557                 }
 558                 else {
 559                         TheSession->wc_session = desired_session;
 560                 }
 561
 562                 strcpy(TheSession->httpauth_user, httpauth_user);
 563                 strcpy(TheSession->httpauth_pass, httpauth_pass);
 564                 TheSession->hash_prefs = NewHash(1,NULL);       /* Get a hash table for the user preferences */
 565                 pthread_mutex_init(&TheSession->SessionMutex, NULL);
 566                 pthread_mutex_lock(&SessionListMutex);
 567                 TheSession->urlstrings = NULL;
 568                 TheSession->vars = NULL;
 569                 TheSession->nonce = rand();
 570                 TheSession->WBuf = NULL;
 571                 TheSession->CLineBuf = NewStrBuf();
 572                 TheSession->next = SessionList;
 573                 TheSession->is_mobile = -1;
 574                 SessionList = TheSession;
 575                 pthread_mutex_unlock(&SessionListMutex);
 576                 session_is_new = 1;
 577         }
 578
 579         /*
 580          * A future improvement might be to check the session integrity
 581          * at this point before continuing.
 582          */
 583
 584         /*
 585          * Bind to the session and perform the transaction
 586          */
 587         pthread_mutex_lock(&TheSession->SessionMutex);          /* bind */
 588         pthread_setspecific(MyConKey, (void *)TheSession);
 589
 590         TheSession->urlstrings = NewHash(1,NULL);
 591         TheSession->vars = NewHash(1,NULL);
 592         TheSession->http_sock = *sock;
 593         TheSession->lastreq = time(NULL);                       /* log */
 594         TheSession->gzip_ok = gzip_ok;
 595 #ifdef ENABLE_NLS
 596         if (session_is_new) {
 597                 httplang_to_locale(accept_language);
 598         }
 599         go_selected_language();                                 /* set locale */
 600 #endif
 601         session_loop(HTTPHeaders, ReqLine, ReqType, Buf);                               /* do transaction */
 602 #ifdef ENABLE_NLS
 603         stop_selected_language();                               /* unset locale */
 604 #endif
 605         DeleteHash(&TheSession->summ);
 606         DeleteHash(&TheSession->urlstrings);
 607         DeleteHash(&TheSession->vars);
 608         FreeStrBuf(&TheSession->WBuf);
 609         FreeStrBuf(&TheSession->HBuf);
 610
 611
 612         pthread_mutex_unlock(&TheSession->SessionMutex);        /* unbind */
 613
 614         /* Free the request buffer */
 615         DeleteHash(&HTTPHeaders);
 616         FreeStrBuf(&ReqLine);
 617         FreeStrBuf(&ReqType);
 618         FreeStrBuf(&Buf);
 619         /*
 620          * Free up any session-local substitution variables which
 621          * were set during this transaction
 622          */
 623
 624
 625 }
 626
 627 void tmpl_nonce(StrBuf *Target, int nArgs, WCTemplateToken *Tokens, void *Context, int ContextType)
 628 {
 629         struct wcsession *WCC = WC;
 630         StrBufAppendPrintf(Target, "%ld",
 631                            (WCC != NULL)? WCC->nonce:0);
 632 }
 633
 634 void
 635 InitModule_CONTEXT
 636 (void)
 637 {
 638         RegisterNamespace("NONCE", 0, 0, tmpl_nonce, 0);
 639 }