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 #include "modules_init.h"
  14
  15 /* Only one thread may manipulate SessionList at a time... */
  16 pthread_mutex_t SessionListMutex;
  17
  18 wcsession *SessionList = NULL; /**< our sessions ????*/
  19
  20 pthread_key_t MyConKey;         /**< TSD key for MySession() */
  21 HashList *HttpReqTypes = NULL;
  22 HashList *HttpHeaderHandler = NULL;
  23 extern HashList *HandlerHash;
  24
  25 void DestroyHttpHeaderHandler(void *V)
  26 {
  27         OneHttpHeader *pHdr;
  28         pHdr = (OneHttpHeader*) V;
  29         FreeStrBuf(&pHdr->Val);
  30         free(pHdr);
  31 }
  32
  33 void shutdown_sessions(void)
  34 {
  35         wcsession *sptr;
  36
  37         for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
  38                         sptr->killthis = 1;
  39         }
  40 }
  41
  42 void do_housekeeping(void)
  43 {
  44         wcsession *sptr, *ss;
  45         wcsession *sessions_to_kill = NULL;
  46         int num_sessions = 0;
  47         static int num_threads = MIN_WORKER_THREADS;
  48
  49         /**
  50          * Lock the session list, moving any candidates for euthanasia into
  51          * a separate list.
  52          */
  53         pthread_mutex_lock(&SessionListMutex);
  54         num_sessions = 0;
  55         for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
  56                 ++num_sessions;
  57
  58                 /** Kill idle sessions */
  59                 if ((time(NULL) - (sptr->lastreq)) >
  60                    (time_t) WEBCIT_TIMEOUT) {
  61                         sptr->killthis = 1;
  62                 }
  63
  64                 /** Remove sessions flagged for kill */
  65                 if (sptr->killthis) {
  66
  67                         /** remove session from linked list */
  68                         if (sptr == SessionList) {
  69                                 SessionList = SessionList->next;
  70                         }
  71                         else for (ss=SessionList;ss!=NULL;ss=ss->next) {
  72                                 if (ss->next == sptr) {
  73                                         ss->next = ss->next->next;
  74                                 }
  75                         }
  76
  77                         sptr->next = sessions_to_kill;
  78                         sessions_to_kill = sptr;
  79                 }
  80         }
  81         pthread_mutex_unlock(&SessionListMutex);
  82
  83         /**
  84          * Now free up and destroy the culled sessions.
  85          */
  86         while (sessions_to_kill != NULL) {
  87                 lprintf(3, "Destroying session %d\n", sessions_to_kill->wc_session);
  88                 pthread_mutex_lock(&sessions_to_kill->SessionMutex);
  89                 pthread_mutex_unlock(&sessions_to_kill->SessionMutex);
  90                 sptr = sessions_to_kill->next;
  91
  92                 session_destroy_modules(&sessions_to_kill);
  93                 sessions_to_kill = sptr;
  94                 --num_sessions;
  95         }
  96
  97         /**
  98          * If there are more sessions than threads, then we should spawn
  99          * more threads ... up to a predefined maximum.
 100          */
 101         while ( (num_sessions > num_threads)
 102               && (num_threads <= MAX_WORKER_THREADS) ) {
 103                 spawn_another_worker_thread();
 104                 ++num_threads;
 105                 lprintf(3, "There are %d sessions and %d threads active.\n",
 106                         num_sessions, num_threads);
 107         }
 108 }
 109
 110
 111 /*
 112  * Wake up occasionally and clean house
 113  */
 114 void housekeeping_loop(void)
 115 {
 116         while (1) {
 117                 sleeeeeeeeeep(HOUSEKEEPING);
 118                 do_housekeeping();
 119         }
 120 }
 121
 122
 123 /*
 124  * Create a Session id
 125  * Generate a unique WebCit session ID (which is not the same thing as the
 126  * Citadel session ID).
 127  */
 128 int GenerateSessionID(void)
 129 {
 130         static int seq = (-1);
 131
 132         if (seq < 0) {
 133                 seq = (int) time(NULL);
 134         }
 135
 136         return ++seq;
 137 }
 138
 139 wcsession *FindSession(wcsession **wclist, ParsedHttpHdrs *Hdr, pthread_mutex_t *ListMutex)
 140 {
 141         wcsession *sptr = NULL;
 142         wcsession *TheSession = NULL;
 143
 144         if (Hdr->HR.got_auth == AUTH_BASIC) {
 145                 GetAuthBasic(Hdr);
 146         }
 147
 148         pthread_mutex_lock(ListMutex);
 149         for (sptr = *wclist; ((sptr != NULL) && (TheSession == NULL)); sptr = sptr->next) {
 150
 151                 /* If HTTP-AUTH, look for a session with matching credentials */
 152                 switch (Hdr->HR.got_auth)
 153                 {
 154                 case AUTH_BASIC:
 155                         if ( (Hdr->HR.SessionKey != sptr->SessionKey))
 156                                 continue;
 157                         if ((!strcasecmp(ChrPtr(Hdr->c_username), ChrPtr(sptr->wc_username))) &&
 158                             (!strcasecmp(ChrPtr(Hdr->c_password), ChrPtr(sptr->wc_password))) ) {
 159                                 TheSession = sptr;
 160                         }
 161                         if (TheSession == NULL)
 162                                 lprintf(1, "found sessionkey [%ld], but credentials for [%s|%s] didn't match\n",
 163                                         Hdr->HR.SessionKey,ChrPtr(Hdr->c_username), ChrPtr(sptr->wc_username));
 164                         break;
 165                 case AUTH_COOKIE:
 166                         /* If cookie-session, look for a session with matching session ID */
 167                         if ( (Hdr->HR.desired_session != 0) &&
 168                              (sptr->wc_session == Hdr->HR.desired_session)) {
 169                                 TheSession = sptr;
 170                         }
 171                         break;
 172                 case NO_AUTH:
 173                         break;
 174                 }
 175         }
 176         pthread_mutex_unlock(ListMutex);
 177         if (TheSession == NULL)
 178                 lprintf(1, "didn't find sessionkey [%ld] for user [%s]\n",
 179                         Hdr->HR.SessionKey,ChrPtr(Hdr->c_username));
 180         return TheSession;
 181 }
 182
 183 wcsession *CreateSession(int Lockable, wcsession **wclist, ParsedHttpHdrs *Hdr, pthread_mutex_t *ListMutex)
 184 {
 185         wcsession *TheSession;
 186         lprintf(3, "Creating a new session\n");
 187         TheSession = (wcsession *) malloc(sizeof(wcsession));
 188         memset(TheSession, 0, sizeof(wcsession));
 189         TheSession->Hdr = Hdr;
 190         TheSession->SessionKey = Hdr->HR.SessionKey;
 191         TheSession->serv_sock = (-1);
 192         TheSession->chat_sock = (-1);
 193         TheSession->is_mobile = -1;
 194
 195         pthread_setspecific(MyConKey, (void *)TheSession);
 196
 197         /* If we're recreating a session that expired, it's best to give it the same
 198          * session number that it had before.  The client browser ought to pick up
 199          * the new session number and start using it, but in some rare situations it
 200          * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
 201          * to get created.
 202          */
 203         if (Hdr->HR.desired_session == 0) {
 204                 TheSession->wc_session = GenerateSessionID();
 205         }
 206         else {
 207                 TheSession->wc_session = Hdr->HR.desired_session;
 208         }
 209
 210         session_new_modules(TheSession);
 211
 212         if (Lockable) {
 213                 pthread_mutex_init(&TheSession->SessionMutex, NULL);
 214
 215                 if (ListMutex != NULL)
 216                         pthread_mutex_lock(ListMutex);
 217
 218                 if (wclist != NULL) {
 219                         TheSession->nonce = rand();
 220                         TheSession->next = *wclist;
 221                         *wclist = TheSession;
 222                 }
 223                 if (ListMutex != NULL)
 224                         pthread_mutex_unlock(ListMutex);
 225         }
 226         return TheSession;
 227 }
 228
 229
 230 /**
 231  * \brief Detects a 'mobile' user agent
 232  */
 233 int is_mobile_ua(char *user_agent) {
 234       if (strstr(user_agent,"iPhone OS") != NULL) {
 235         return 1;
 236       } else if (strstr(user_agent,"Windows CE") != NULL) {
 237         return 1;
 238       } else if (strstr(user_agent,"SymbianOS") != NULL) {
 239         return 1;
 240       } else if (strstr(user_agent, "Opera Mobi") != NULL) {
 241         return 1;
 242       } else if (strstr(user_agent, "Firefox/2.0.0 Opera 9.51 Beta") != NULL) {
 243               /*  For some reason a new install of Opera 9.51beta decided to spoof. */
 244           return 1;
 245           }
 246       return 0;
 247 }
 248
 249 /* If it's a "force 404" situation then display the error and bail. */
 250 void do_404(void)
 251 {
 252         hprintf("HTTP/1.1 404 Not found\r\n");
 253         hprintf("Content-Type: text/plain\r\n");
 254         wprintf("Not found\r\n");
 255         end_burst();
 256 }
 257
 258 int ReadHttpSubject(ParsedHttpHdrs *Hdr, StrBuf *Line, StrBuf *Buf)
 259 {
 260         const char *Args;
 261         void *vLine, *vHandler;
 262         const char *Pos = NULL;
 263
 264
 265         Hdr->HR.ReqLine = Line;
 266         /* The requesttype... GET, POST... */
 267         StrBufExtract_token(Buf, Hdr->HR.ReqLine, 0, ' ');
 268         if (GetHash(HttpReqTypes, SKEY(Buf), &vLine) &&
 269             (vLine != NULL))
 270         {
 271                 Hdr->HR.eReqType = *(long*)vLine;
 272         }
 273         else {
 274                 Hdr->HR.eReqType = eGET;
 275                 return 1;
 276         }
 277         StrBufCutLeft(Hdr->HR.ReqLine, StrLength(Buf) + 1);
 278
 279         /* the HTTP Version... */
 280         StrBufExtract_token(Buf, Hdr->HR.ReqLine, 1, ' ');
 281         StrBufCutRight(Hdr->HR.ReqLine, StrLength(Buf) + 1);
 282
 283         if (StrLength(Buf) == 0) {
 284                 Hdr->HR.eReqType = eGET;
 285                 return 1;
 286         }
 287
 288         StrBufAppendBuf(Hdr->this_page, Hdr->HR.ReqLine, 0);
 289         /* chop Filename / query arguments */
 290         Args = strchr(ChrPtr(Hdr->HR.ReqLine), '?');
 291         if (Args == NULL) /* whe're not that picky about params... TODO: this will spoil '&' in filenames.*/
 292                 Args = strchr(ChrPtr(Hdr->HR.ReqLine), '&');
 293         if (Args != NULL) {
 294                 Args ++; /* skip the ? */
 295                 StrBufPlain(Hdr->PlainArgs,
 296                             Args,
 297                             StrLength(Hdr->HR.ReqLine) -
 298                             (Args - ChrPtr(Hdr->HR.ReqLine)));
 299                 StrBufCutAt(Hdr->HR.ReqLine, 0, Args - 1);
 300         } /* don't parse them yet, maybe we don't even care... */
 301
 302         /* now lookup what we are going to do with this... */
 303         /* skip first slash */
 304         StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
 305         do {
 306                 StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
 307
 308                 GetHash(HandlerHash, SKEY(Buf), &vHandler),
 309                 Hdr->HR.Handler = (WebcitHandler*) vHandler;
 310                 if (Hdr->HR.Handler == NULL)
 311                         break;
 312                 /*
 313                  * If the request is prefixed by "/webcit" then chop that off.  This
 314                  * allows a front end web server to forward all /webcit requests to us
 315                  * while still using the same web server port for other things.
 316                  */
 317                 if ((Hdr->HR.Handler->Flags & URLNAMESPACE) != 0)
 318                         continue;
 319                 break;
 320         } while (1);
 321         /* remove the handlername from the URL */
 322         if ((Pos != NULL) && (Pos != StrBufNOTNULL)){
 323                 StrBufCutLeft(Hdr->HR.ReqLine,
 324                               Pos - ChrPtr(Hdr->HR.ReqLine));
 325         }
 326
 327         if (Hdr->HR.Handler != NULL) {
 328                 if ((Hdr->HR.Handler->Flags & BOGUS) != 0)
 329                         return 1;
 330                 Hdr->HR.DontNeedAuth = (
 331                         ((Hdr->HR.Handler->Flags & ISSTATIC) != 0) ||
 332                         ((Hdr->HR.Handler->Flags & ANONYMOUS) != 0)
 333                         );
 334         }
 335         else {
 336                 Hdr->HR.DontNeedAuth = 1; /* Flat request? show him the login screen... */
 337         }
 338
 339         return 0;
 340 }
 341
 342 int AnalyseHeaders(ParsedHttpHdrs *Hdr)
 343 {
 344         OneHttpHeader *pHdr;
 345         void *vHdr;
 346         long HKLen;
 347         const char *HashKey;
 348         HashPos *at = GetNewHashPos(Hdr->HTTPHeaders, 0);
 349
 350         while (GetNextHashPos(Hdr->HTTPHeaders, at, &HKLen, &HashKey, &vHdr) &&
 351                (vHdr != NULL)) {
 352                 pHdr = (OneHttpHeader *)vHdr;
 353                 if (pHdr->HaveEvaluator)
 354                         pHdr->H(pHdr->Val, Hdr);
 355
 356         }
 357         DeleteHashPos(&at);
 358         return 0;
 359 }
 360
 361 /*const char *nix(void *vptr) {return ChrPtr( (StrBuf*)vptr);}*/
 362
 363 /*
 364  * Read in the request
 365  */
 366 int ReadHTTPRequest (ParsedHttpHdrs *Hdr)
 367 {
 368         const char *pch, *pchs, *pche;
 369         OneHttpHeader *pHdr;
 370         StrBuf *Line, *LastLine, *HeaderName;
 371         int nLine = 0;
 372         void *vF;
 373         int isbogus = 0;
 374
 375         HeaderName = NewStrBuf();
 376         LastLine = NULL;
 377         do {
 378                 nLine ++;
 379                 Line = NewStrBufPlain(NULL, SIZ / 4);
 380
 381                 if (ClientGetLine(Hdr, Line) < 0) return 1;
 382
 383                 if (StrLength(Line) == 0) {
 384                         FreeStrBuf(&Line);
 385                         continue;
 386                 }
 387                 if (nLine == 1) {
 388                         Hdr->HTTPHeaders = NewHash(1, NULL);
 389                         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 390                         memset(pHdr, 0, sizeof(OneHttpHeader));
 391                         pHdr->Val = Line;
 392                         Put(Hdr->HTTPHeaders, HKEY("GET /"), pHdr, DestroyHttpHeaderHandler);
 393                         lprintf(9, "%s\n", ChrPtr(Line));
 394                         isbogus = ReadHttpSubject(Hdr, Line, HeaderName);
 395                         if (isbogus) break;
 396                         continue;
 397                 }
 398
 399                 /* Do we need to Unfold? */
 400                 if ((LastLine != NULL) &&
 401                     (isspace(*ChrPtr(Line)))) {
 402                         pch = pchs = ChrPtr(Line);
 403                         pche = pchs + StrLength(Line);
 404                         while (isspace(*pch) && (pch < pche))
 405                                 pch ++;
 406                         StrBufCutLeft(Line, pch - pchs);
 407                         StrBufAppendBuf(LastLine, Line, 0);
 408
 409                         FreeStrBuf(&Line);
 410                         continue;
 411                 }
 412
 413                 StrBufSanitizeAscii(Line, '§');
 414                 StrBufExtract_token(HeaderName, Line, 0, ':');
 415
 416                 pchs = ChrPtr(Line);
 417                 pch = pchs + StrLength(HeaderName) + 1;
 418                 pche = pchs + StrLength(Line);
 419                 while (isspace(*pch) && (pch < pche))
 420                         pch ++;
 421                 StrBufCutLeft(Line, pch - pchs);
 422
 423                 StrBufUpCase(HeaderName);
 424
 425                 pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 426                 memset(pHdr, 0, sizeof(OneHttpHeader));
 427                 pHdr->Val = Line;
 428
 429                 if (GetHash(HttpHeaderHandler, SKEY(HeaderName), &vF) &&
 430                     (vF != NULL))
 431                 {
 432                         OneHttpHeader *FHdr = (OneHttpHeader*) vF;
 433                         pHdr->H = FHdr->H;
 434                         pHdr->HaveEvaluator = 1;
 435                 }
 436                 Put(Hdr->HTTPHeaders, SKEY(HeaderName), pHdr, DestroyHttpHeaderHandler);
 437                 LastLine = Line;
 438         } while (Line != NULL);
 439
 440         FreeStrBuf(&HeaderName);
 441
 442         return isbogus;
 443 }
 444
 445 void OverrideRequest(ParsedHttpHdrs *Hdr, const char *Line, long len)
 446 {
 447         StrBuf *Buf = NewStrBuf();
 448
 449         FlushStrBuf(Hdr->HR.ReqLine);
 450         StrBufPlain(Hdr->HR.ReqLine, Line, len);
 451         ReadHttpSubject(Hdr, Hdr->HR.ReqLine, Buf);
 452
 453         FreeStrBuf(&Buf);
 454 }
 455
 456 /*
 457  * handle one request
 458  *
 459  * This loop gets called once for every HTTP connection made to WebCit.  At
 460  * this entry point we have an HTTP socket with a browser allegedly on the
 461  * other end, but we have not yet bound to a WebCit session.
 462  *
 463  * The job of this function is to locate the correct session and bind to it,
 464  * or create a session if necessary and bind to it, then run the WebCit
 465  * transaction loop.  Afterwards, we unbind from the session.  When this
 466  * function returns, the worker thread is then free to handle another
 467  * transaction.
 468  */
 469 void context_loop(ParsedHttpHdrs *Hdr)
 470 {
 471         int isbogus = 0;
 472         wcsession *TheSession;
 473         struct timeval tx_start;
 474         struct timeval tx_finish;
 475
 476         gettimeofday(&tx_start, NULL);          /* start a stopwatch for performance timing */
 477
 478         /*
 479          * Find out what it is that the web browser is asking for
 480          */
 481         isbogus = ReadHTTPRequest(Hdr);
 482
 483         if (!isbogus)
 484                 isbogus = AnalyseHeaders(Hdr);
 485
 486         if ((isbogus) ||
 487             ((Hdr->HR.Handler != NULL) &&
 488              ((Hdr->HR.Handler->Flags & BOGUS) != 0)))
 489         {
 490                 wcsession *Bogus;
 491
 492                 Bogus = CreateSession(0, NULL, Hdr, NULL);
 493
 494                 do_404();
 495
 496                 lprintf(9, "HTTP: 404 [%ld.%06ld] %s %s \n",
 497                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 498                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
 499                         ReqStrs[Hdr->HR.eReqType],
 500                         ChrPtr(Hdr->this_page)
 501                         );
 502                 session_detach_modules(Bogus);
 503                 session_destroy_modules(&Bogus);
 504                 return;
 505         }
 506
 507         if ((Hdr->HR.Handler != NULL) && ((Hdr->HR.Handler->Flags & ISSTATIC) != 0))
 508         {
 509                 wcsession *Static;
 510                 Static = CreateSession(0, NULL, Hdr, NULL);
 511
 512                 Hdr->HR.Handler->F();
 513
 514                 /* How long did this transaction take? */
 515                 gettimeofday(&tx_finish, NULL);
 516
 517 #ifdef TECH_PREVIEW
 518                 if ((Hdr->HR.Handler != NULL) ||
 519                     ((Hdr->HR.Handler->Flags & LOGCHATTY) == 0))
 520 #endif
 521                         lprintf(9, "HTTP: 200 [%ld.%06ld] %s %s \n",
 522                                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 523                                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
 524                                 ReqStrs[Hdr->HR.eReqType],
 525                                 ChrPtr(Hdr->this_page)
 526                                 );
 527                 session_detach_modules(Static);
 528                 session_destroy_modules(&Static);
 529                 return;
 530         }
 531
 532         if (Hdr->HR.got_auth == AUTH_BASIC) {
 533                 CheckAuthBasic(Hdr);
 534         }
 535
 536         /*
 537          * See if there's an existing session open with the desired ID or user/pass
 538          */
 539         TheSession = FindSession(&SessionList, Hdr, &SessionListMutex);
 540
 541         /*
 542          * Create a new session if we have to
 543          */
 544         if (TheSession == NULL) {
 545                 TheSession = CreateSession(1, &SessionList, Hdr, &SessionListMutex);
 546
 547                 if ((StrLength(Hdr->c_username) == 0) && (!Hdr->HR.DontNeedAuth)) {
 548
 549                         if ((Hdr->HR.Handler != NULL) &&
 550                             (XHTTP_COMMANDS & Hdr->HR.Handler->Flags) == XHTTP_COMMANDS) {
 551                                 OverrideRequest(Hdr, HKEY("GET /401 HTTP/1.0"));
 552                                 Hdr->HR.prohibit_caching = 1;
 553                         }
 554                         else {
 555                                 OverrideRequest(Hdr, HKEY("GET /static/nocookies.html?force_close_session=yes HTTP/1.0"));
 556                                 Hdr->HR.prohibit_caching = 1;
 557                         }
 558                 }
 559
 560                 if (StrLength(Hdr->c_language) > 0) {
 561                         lprintf(9, "Session cookie requests language '%s'\n", ChrPtr(Hdr->c_language));
 562                         set_selected_language(ChrPtr(Hdr->c_language));
 563                         go_selected_language();
 564                 }
 565         }
 566
 567         /*
 568          * A future improvement might be to check the session integrity
 569          * at this point before continuing.
 570          */
 571
 572         /*
 573          * Bind to the session and perform the transaction
 574          */
 575         pthread_mutex_lock(&TheSession->SessionMutex);          /* bind */
 576         pthread_setspecific(MyConKey, (void *)TheSession);
 577
 578         TheSession->lastreq = time(NULL);                       /* log */
 579         TheSession->Hdr = Hdr;
 580
 581         session_attach_modules(TheSession);
 582         session_loop();                         /* do transaction */
 583
 584
 585         /* How long did this transaction take? */
 586         gettimeofday(&tx_finish, NULL);
 587
 588
 589 #ifdef TECH_PREVIEW
 590         if ((Hdr->HR.Handler != NULL) &&
 591             ((Hdr->HR.Handler->Flags & LOGCHATTY) == 0))
 592 #endif
 593                 lprintf(9, "HTTP: 200 [%ld.%06ld] %s %s \n",
 594                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 595                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
 596                         ReqStrs[Hdr->HR.eReqType],
 597                         ChrPtr(Hdr->this_page)
 598                         );
 599
 600         session_detach_modules(TheSession);
 601
 602         TheSession->Hdr = NULL;
 603         pthread_mutex_unlock(&TheSession->SessionMutex);        /* unbind */
 604 }
 605
 606 void tmplput_nonce(StrBuf *Target, WCTemplputParams *TP)
 607 {
 608         wcsession *WCC = WC;
 609         StrBufAppendPrintf(Target, "%ld",
 610                            (WCC != NULL)? WCC->nonce:0);
 611 }
 612
 613 void tmplput_current_user(StrBuf *Target, WCTemplputParams *TP)
 614 {
 615         StrBufAppendTemplate(Target, TP, WC->wc_fullname, 0);
 616 }
 617
 618 void tmplput_current_room(StrBuf *Target, WCTemplputParams *TP)
 619 {
 620         StrBufAppendTemplate(Target, TP, WC->wc_roomname, 0);
 621 }
 622
 623 void Header_HandleContentLength(StrBuf *Line, ParsedHttpHdrs *hdr)
 624 {
 625         hdr->HR.ContentLength = StrToi(Line);
 626 }
 627
 628 void Header_HandleContentType(StrBuf *Line, ParsedHttpHdrs *hdr)
 629 {
 630         hdr->HR.ContentType = Line;
 631 }
 632
 633 void Header_HandleUserAgent(StrBuf *Line, ParsedHttpHdrs *hdr)
 634 {
 635         hdr->HR.user_agent = Line;
 636 #ifdef TECH_PREVIEW
 637 /* TODO: do this later on session creating
 638         if ((WCC->is_mobile < 0) && is_mobile_ua(&buf[12])) {
 639                 WCC->is_mobile = 1;
 640         }
 641         else {
 642                 WCC->is_mobile = 0;
 643         }
 644 */
 645 #endif
 646 }
 647
 648
 649 void Header_HandleHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 650 {
 651         if ((follow_xff) && (hdr->HR.http_host != NULL))
 652                 return;
 653         else
 654                 hdr->HR.http_host = Line;
 655 }
 656
 657 void Header_HandleXFFHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 658 {
 659         if (follow_xff)
 660                 hdr->HR.http_host = Line;
 661 }
 662
 663
 664 void Header_HandleXFF(StrBuf *Line, ParsedHttpHdrs *hdr)
 665 {
 666         hdr->HR.browser_host = Line;
 667
 668         while (StrBufNum_tokens(hdr->HR.browser_host, ',') > 1) {
 669                 StrBufRemove_token(hdr->HR.browser_host, 0, ',');
 670         }
 671         StrBufTrim(hdr->HR.browser_host);
 672 }
 673
 674 void Header_HandleIfModSince(StrBuf *Line, ParsedHttpHdrs *hdr)
 675 {
 676         hdr->HR.if_modified_since = httpdate_to_timestamp(Line);
 677 }
 678
 679 void Header_HandleAcceptEncoding(StrBuf *Line, ParsedHttpHdrs *hdr)
 680 {
 681         /*
 682          * Can we compress?
 683          */
 684         if (strstr(&ChrPtr(Line)[16], "gzip")) {
 685                 hdr->HR.gzip_ok = 1;
 686         }
 687 }
 688 const char *ReqStrs[eNONE] = {
 689         "GET",
 690         "POST",
 691         "OPTIONS",
 692         "PROPFIND",
 693         "PUT",
 694         "DELETE",
 695         "HEAD",
 696         "MOVE",
 697         "COPY"
 698 };
 699
 700 void
 701 ServerStartModule_CONTEXT
 702 (void)
 703 {
 704         long *v;
 705         HttpReqTypes = NewHash(1, NULL);
 706         HttpHeaderHandler = NewHash(1, NULL);
 707
 708         v = malloc(sizeof(long));
 709         *v = eGET;
 710         Put(HttpReqTypes, HKEY("GET"), v, NULL);
 711
 712         v = malloc(sizeof(long));
 713         *v = ePOST;
 714         Put(HttpReqTypes, HKEY("POST"), v, NULL);
 715
 716         v = malloc(sizeof(long));
 717         *v = eOPTIONS;
 718         Put(HttpReqTypes, HKEY("OPTIONS"), v, NULL);
 719
 720         v = malloc(sizeof(long));
 721         *v = ePROPFIND;
 722         Put(HttpReqTypes, HKEY("PROPFIND"), v, NULL);
 723
 724         v = malloc(sizeof(long));
 725         *v = ePUT;
 726         Put(HttpReqTypes, HKEY("PUT"), v, NULL);
 727
 728         v = malloc(sizeof(long));
 729         *v = eDELETE;
 730         Put(HttpReqTypes, HKEY("DELETE"), v, NULL);
 731
 732         v = malloc(sizeof(long));
 733         *v = eHEAD;
 734         Put(HttpReqTypes, HKEY("HEAD"), v, NULL);
 735
 736         v = malloc(sizeof(long));
 737         *v = eMOVE;
 738         Put(HttpReqTypes, HKEY("MOVE"), v, NULL);
 739
 740         v = malloc(sizeof(long));
 741         *v = eCOPY;
 742         Put(HttpReqTypes, HKEY("COPY"), v, NULL);
 743 }
 744
 745 void
 746 ServerShutdownModule_CONTEXT
 747 (void)
 748 {
 749         DeleteHash(&HttpReqTypes);
 750         DeleteHash(&HttpHeaderHandler);
 751 }
 752
 753 void RegisterHeaderHandler(const char *Name, long Len, Header_Evaluator F)
 754 {
 755         OneHttpHeader *pHdr;
 756         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 757         memset(pHdr, 0, sizeof(OneHttpHeader));
 758         pHdr->H = F;
 759         Put(HttpHeaderHandler, Name, Len, pHdr, DestroyHttpHeaderHandler);
 760 }
 761
 762
 763 void
 764 InitModule_CONTEXT
 765 (void)
 766 {
 767         RegisterHeaderHandler(HKEY("CONTENT-LENGTH"), Header_HandleContentLength);
 768         RegisterHeaderHandler(HKEY("CONTENT-TYPE"), Header_HandleContentType);
 769         RegisterHeaderHandler(HKEY("USER-AGENT"), Header_HandleUserAgent);
 770         RegisterHeaderHandler(HKEY("X-FORWARDED-HOST"), Header_HandleXFFHost);
 771         RegisterHeaderHandler(HKEY("HOST"), Header_HandleHost);
 772         RegisterHeaderHandler(HKEY("X-FORWARDED-FOR"), Header_HandleXFF);
 773         RegisterHeaderHandler(HKEY("ACCEPT-ENCODING"), Header_HandleAcceptEncoding);
 774         RegisterHeaderHandler(HKEY("IF-MODIFIED-SINCE"), Header_HandleIfModSince);
 775
 776         RegisterNamespace("CURRENT_USER", 0, 1, tmplput_current_user, CTX_NONE);
 777         RegisterNamespace("CURRENT_ROOM", 0, 1, tmplput_current_room, CTX_NONE);
 778         RegisterNamespace("NONCE", 0, 0, tmplput_nonce, 0);
 779
 780         WebcitAddUrlHandler(HKEY("404"), do_404, ANONYMOUS|COOKIEUNNEEDED);
 781 /*
 782  * Look for commonly-found probes of malware such as worms, viruses, trojans, and Microsoft Office.
 783  * Short-circuit these requests so we don't have to send them through the full processing loop.
 784  */
 785         WebcitAddUrlHandler(HKEY("scripts"), do_404, ANONYMOUS|BOGUS);          /* /root.exe - Worms and trojans and viruses, oh my! */
 786         WebcitAddUrlHandler(HKEY("c"), do_404, ANONYMOUS|BOGUS);                /* /winnt */
 787         WebcitAddUrlHandler(HKEY("MSADC"), do_404, ANONYMOUS|BOGUS);
 788         WebcitAddUrlHandler(HKEY("_vti"), do_404, ANONYMOUS|BOGUS);             /* Broken Microsoft DAV implementation */
 789         WebcitAddUrlHandler(HKEY("MSOffice"), do_404, ANONYMOUS|BOGUS);         /* Stoopid MSOffice thinks everyone is IIS */
 790         WebcitAddUrlHandler(HKEY("nonexistenshit"), do_404, ANONYMOUS|BOGUS);   /* Exploit found in the wild January 2009 */
 791 }
 792
 793
 794 void
 795 HttpNewModule_CONTEXT
 796 (ParsedHttpHdrs *httpreq)
 797 {
 798         httpreq->PlainArgs = NewStrBufPlain(NULL, SIZ);
 799         httpreq->this_page = NewStrBufPlain(NULL, SIZ);
 800 }
 801
 802 void
 803 HttpDetachModule_CONTEXT
 804 (ParsedHttpHdrs *httpreq)
 805 {
 806         FlushStrBuf(httpreq->PlainArgs);
 807         FlushStrBuf(httpreq->this_page);
 808         FlushStrBuf(httpreq->PlainArgs);
 809         DeleteHash(&httpreq->HTTPHeaders);
 810         memset(&httpreq->HR, 0, sizeof(HdrRefs));
 811 }
 812
 813 void
 814 HttpDestroyModule_CONTEXT
 815 (ParsedHttpHdrs *httpreq)
 816 {
 817         FreeStrBuf(&httpreq->this_page);
 818         FreeStrBuf(&httpreq->PlainArgs);
 819         FreeStrBuf(&httpreq->this_page);
 820         FreeStrBuf(&httpreq->PlainArgs);
 821         DeleteHash(&httpreq->HTTPHeaders);
 822
 823 }