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;  /* Linked list of all webcit sessions */
  19
  20 pthread_key_t MyConKey;         /* TSD key for MySession() */
  21 HashList *HttpReqTypes = NULL;
  22 HashList *HttpHeaderHandler = NULL;
  23 extern HashList *HandlerHash;
  24 int num_threads = 1;            /* Number of worker threads.  Start at 1 because the parent counts. */
  25
  26 void DestroyHttpHeaderHandler(void *V)
  27 {
  28         OneHttpHeader *pHdr;
  29         pHdr = (OneHttpHeader*) V;
  30         FreeStrBuf(&pHdr->Val);
  31         free(pHdr);
  32 }
  33
  34 void shutdown_sessions(void)
  35 {
  36         wcsession *sptr;
  37
  38         for (sptr = SessionList; sptr != NULL; sptr = sptr->next) {
  39                         sptr->killthis = 1;
  40         }
  41 }
  42
  43 void do_housekeeping(void)
  44 {
  45         wcsession *sptr, *ss;
  46         wcsession *sessions_to_kill = NULL;
  47         int num_sessions = 0;
  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)) > (time_t) WEBCIT_TIMEOUT) {
  60                         sptr->killthis = 1;
  61                 }
  62
  63                 /* Remove sessions flagged for kill */
  64                 if (sptr->killthis) {
  65
  66                         /** remove session from linked list */
  67                         if (sptr == SessionList) {
  68                                 SessionList = SessionList->next;
  69                         }
  70                         else for (ss=SessionList;ss!=NULL;ss=ss->next) {
  71                                 if (ss->next == sptr) {
  72                                         ss->next = ss->next->next;
  73                                 }
  74                         }
  75
  76                         sptr->next = sessions_to_kill;
  77                         sessions_to_kill = sptr;
  78                 }
  79         }
  80         pthread_mutex_unlock(&SessionListMutex);
  81
  82         /*
  83          * Now free up and destroy the culled sessions.
  84          */
  85         while (sessions_to_kill != NULL) {
  86                 lprintf(3, "Destroying session %d\n", sessions_to_kill->wc_session);
  87                 pthread_mutex_lock(&sessions_to_kill->SessionMutex);
  88                 pthread_mutex_unlock(&sessions_to_kill->SessionMutex);
  89                 sptr = sessions_to_kill->next;
  90
  91                 session_destroy_modules(&sessions_to_kill);
  92                 sessions_to_kill = sptr;
  93                 --num_sessions;
  94         }
  95
  96         /*
  97          * If there are more sessions than threads, then we should spawn
  98          * more threads ... up to a predefined maximum.
  99          */
 100         while ( (num_sessions > num_threads) && (num_threads <= MAX_WORKER_THREADS) ) {
 101                 spawn_another_worker_thread();
 102                 lprintf(3, "There are %d sessions and %d threads active.\n",
 103                         num_sessions, num_threads);
 104         }
 105 }
 106
 107
 108 /*
 109  * Wake up occasionally and clean house
 110  */
 111 void housekeeping_loop(void)
 112 {
 113         while (1) {
 114                 sleeeeeeeeeep(HOUSEKEEPING);
 115                 do_housekeeping();
 116         }
 117 }
 118
 119
 120 /*
 121  * Create a Session id
 122  * Generate a unique WebCit session ID (which is not the same thing as the
 123  * Citadel session ID).
 124  */
 125 int GenerateSessionID(void)
 126 {
 127         static int seq = (-1);
 128
 129         if (seq < 0) {
 130                 seq = (int) time(NULL);
 131         }
 132
 133         return ++seq;
 134 }
 135
 136 wcsession *FindSession(wcsession **wclist, ParsedHttpHdrs *Hdr, pthread_mutex_t *ListMutex)
 137 {
 138         wcsession *sptr = NULL;
 139         wcsession *TheSession = NULL;
 140
 141         if (Hdr->HR.got_auth == AUTH_BASIC) {
 142                 GetAuthBasic(Hdr);
 143         }
 144
 145         pthread_mutex_lock(ListMutex);
 146         for (sptr = *wclist; ((sptr != NULL) && (TheSession == NULL)); sptr = sptr->next) {
 147
 148                 /* If HTTP-AUTH, look for a session with matching credentials */
 149                 switch (Hdr->HR.got_auth)
 150                 {
 151                 case AUTH_BASIC:
 152                         if ( (Hdr->HR.SessionKey != sptr->SessionKey))
 153                                 continue;
 154                         if ((!strcasecmp(ChrPtr(Hdr->c_username), ChrPtr(sptr->wc_username))) &&
 155                             (!strcasecmp(ChrPtr(Hdr->c_password), ChrPtr(sptr->wc_password))) ) {
 156                                 TheSession = sptr;
 157                         }
 158                         if (TheSession == NULL)
 159                                 lprintf(1, "found sessionkey [%ld], but credentials for [%s|%s] didn't match\n",
 160                                         Hdr->HR.SessionKey,ChrPtr(Hdr->c_username), ChrPtr(sptr->wc_username));
 161                         break;
 162                 case AUTH_COOKIE:
 163                         /* If cookie-session, look for a session with matching session ID */
 164                         if ( (Hdr->HR.desired_session != 0) &&
 165                              (sptr->wc_session == Hdr->HR.desired_session)) {
 166                                 TheSession = sptr;
 167                         }
 168                         break;
 169                 case NO_AUTH:
 170                         break;
 171                 }
 172         }
 173         pthread_mutex_unlock(ListMutex);
 174         if (TheSession == NULL)
 175                 lprintf(1, "didn't find sessionkey [%ld] for user [%s]\n",
 176                         Hdr->HR.SessionKey,ChrPtr(Hdr->c_username));
 177         return TheSession;
 178 }
 179
 180 wcsession *CreateSession(int Lockable, int Static, wcsession **wclist, ParsedHttpHdrs *Hdr, pthread_mutex_t *ListMutex)
 181 {
 182         wcsession *TheSession;
 183         if (!Static)
 184                 lprintf(3, "Creating a new session\n");
 185         TheSession = (wcsession *) malloc(sizeof(wcsession));
 186         memset(TheSession, 0, sizeof(wcsession));
 187         TheSession->Hdr = Hdr;
 188         TheSession->SessionKey = Hdr->HR.SessionKey;
 189         TheSession->serv_sock = (-1);
 190         TheSession->chat_sock = (-1);
 191         TheSession->is_mobile = -1;
 192
 193         pthread_setspecific(MyConKey, (void *)TheSession);
 194
 195         /* If we're recreating a session that expired, it's best to give it the same
 196          * session number that it had before.  The client browser ought to pick up
 197          * the new session number and start using it, but in some rare situations it
 198          * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
 199          * to get created.
 200          */
 201         if (Hdr->HR.desired_session == 0) {
 202                 TheSession->wc_session = GenerateSessionID();
 203         }
 204         else {
 205                 TheSession->wc_session = Hdr->HR.desired_session;
 206         }
 207         Hdr->HR.Static = Static;
 208         session_new_modules(TheSession);
 209
 210         if (Lockable) {
 211                 pthread_mutex_init(&TheSession->SessionMutex, NULL);
 212
 213                 if (ListMutex != NULL)
 214                         pthread_mutex_lock(ListMutex);
 215
 216                 if (wclist != NULL) {
 217                         TheSession->nonce = rand();
 218                         TheSession->next = *wclist;
 219                         *wclist = TheSession;
 220                 }
 221                 if (ListMutex != NULL)
 222                         pthread_mutex_unlock(ListMutex);
 223         }
 224         return TheSession;
 225 }
 226
 227
 228 /*
 229  * Detects a 'mobile' user agent
 230  */
 231 int is_mobile_ua(char *user_agent) {
 232       if (strstr(user_agent,"iPhone OS") != NULL) {
 233         return 1;
 234       } else if (strstr(user_agent,"Windows CE") != NULL) {
 235         return 1;
 236       } else if (strstr(user_agent,"SymbianOS") != NULL) {
 237         return 1;
 238       } else if (strstr(user_agent, "Opera Mobi") != NULL) {
 239         return 1;
 240       } else if (strstr(user_agent, "Firefox/2.0.0 Opera 9.51 Beta") != NULL) {
 241               /*  For some reason a new install of Opera 9.51beta decided to spoof. */
 242           return 1;
 243           }
 244       return 0;
 245 }
 246
 247 /* If it's a "force 404" situation then display the error and bail. */
 248 void do_404(void)
 249 {
 250         hprintf("HTTP/1.1 404 Not found\r\n");
 251         hprintf("Content-Type: text/plain\r\n");
 252         wc_printf("Not found\r\n");
 253         end_burst();
 254 }
 255
 256 int ReadHttpSubject(ParsedHttpHdrs *Hdr, StrBuf *Line, StrBuf *Buf)
 257 {
 258         const char *Args;
 259         void *vLine, *vHandler;
 260         const char *Pos = NULL;
 261
 262
 263         Hdr->HR.ReqLine = Line;
 264         /* The requesttype... GET, POST... */
 265         StrBufExtract_token(Buf, Hdr->HR.ReqLine, 0, ' ');
 266         if (GetHash(HttpReqTypes, SKEY(Buf), &vLine) &&
 267             (vLine != NULL))
 268         {
 269                 Hdr->HR.eReqType = *(long*)vLine;
 270         }
 271         else {
 272                 Hdr->HR.eReqType = eGET;
 273                 return 1;
 274         }
 275         StrBufCutLeft(Hdr->HR.ReqLine, StrLength(Buf) + 1);
 276
 277         /* the HTTP Version... */
 278         StrBufExtract_token(Buf, Hdr->HR.ReqLine, 1, ' ');
 279         StrBufCutRight(Hdr->HR.ReqLine, StrLength(Buf) + 1);
 280
 281         if (StrLength(Buf) == 0) {
 282                 Hdr->HR.eReqType = eGET;
 283                 return 1;
 284         }
 285
 286         StrBufAppendBuf(Hdr->this_page, Hdr->HR.ReqLine, 0);
 287         /* chop Filename / query arguments */
 288         Args = strchr(ChrPtr(Hdr->HR.ReqLine), '?');
 289         if (Args == NULL) /* whe're not that picky about params... TODO: this will spoil '&' in filenames.*/
 290                 Args = strchr(ChrPtr(Hdr->HR.ReqLine), '&');
 291         if (Args != NULL) {
 292                 Args ++; /* skip the ? */
 293                 StrBufPlain(Hdr->PlainArgs,
 294                             Args,
 295                             StrLength(Hdr->HR.ReqLine) -
 296                             (Args - ChrPtr(Hdr->HR.ReqLine)));
 297                 StrBufCutAt(Hdr->HR.ReqLine, 0, Args - 1);
 298         } /* don't parse them yet, maybe we don't even care... */
 299
 300         /* now lookup what we are going to do with this... */
 301         /* skip first slash */
 302         StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
 303         do {
 304                 StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
 305
 306                 GetHash(HandlerHash, SKEY(Buf), &vHandler),
 307                 Hdr->HR.Handler = (WebcitHandler*) vHandler;
 308                 if (Hdr->HR.Handler == NULL)
 309                         break;
 310                 /*
 311                  * If the request is prefixed by "/webcit" then chop that off.  This
 312                  * allows a front end web server to forward all /webcit requests to us
 313                  * while still using the same web server port for other things.
 314                  */
 315                 if ((Hdr->HR.Handler->Flags & URLNAMESPACE) != 0)
 316                         continue;
 317                 break;
 318         } while (1);
 319         /* remove the handlername from the URL */
 320         if ((Pos != NULL) && (Pos != StrBufNOTNULL)){
 321                 StrBufCutLeft(Hdr->HR.ReqLine,
 322                               Pos - ChrPtr(Hdr->HR.ReqLine));
 323         }
 324
 325         if (Hdr->HR.Handler != NULL) {
 326                 if ((Hdr->HR.Handler->Flags & BOGUS) != 0)
 327                         return 1;
 328                 Hdr->HR.DontNeedAuth = (
 329                         ((Hdr->HR.Handler->Flags & ISSTATIC) != 0) ||
 330                         ((Hdr->HR.Handler->Flags & ANONYMOUS) != 0)
 331                         );
 332         }
 333         else {
 334                 Hdr->HR.DontNeedAuth = 1; /* Flat request? show him the login screen... */
 335         }
 336
 337         return 0;
 338 }
 339
 340 int AnalyseHeaders(ParsedHttpHdrs *Hdr)
 341 {
 342         OneHttpHeader *pHdr;
 343         void *vHdr;
 344         long HKLen;
 345         const char *HashKey;
 346         HashPos *at = GetNewHashPos(Hdr->HTTPHeaders, 0);
 347
 348         while (GetNextHashPos(Hdr->HTTPHeaders, at, &HKLen, &HashKey, &vHdr) &&
 349                (vHdr != NULL)) {
 350                 pHdr = (OneHttpHeader *)vHdr;
 351                 if (pHdr->HaveEvaluator)
 352                         pHdr->H(pHdr->Val, Hdr);
 353
 354         }
 355         DeleteHashPos(&at);
 356         return 0;
 357 }
 358
 359 /*const char *nix(void *vptr) {return ChrPtr( (StrBuf*)vptr);}*/
 360
 361 /*
 362  * Read in the request
 363  */
 364 int ReadHTTPRequest (ParsedHttpHdrs *Hdr)
 365 {
 366         const char *pch, *pchs, *pche;
 367         OneHttpHeader *pHdr;
 368         StrBuf *Line, *LastLine, *HeaderName;
 369         int nLine = 0;
 370         void *vF;
 371         int isbogus = 0;
 372
 373         HeaderName = NewStrBuf();
 374         LastLine = NULL;
 375         do {
 376                 nLine ++;
 377                 Line = NewStrBufPlain(NULL, SIZ / 4);
 378
 379                 if (ClientGetLine(Hdr, Line) < 0) return 1;
 380
 381                 if (StrLength(Line) == 0) {
 382                         FreeStrBuf(&Line);
 383                         continue;
 384                 }
 385                 if (nLine == 1) {
 386                         Hdr->HTTPHeaders = NewHash(1, NULL);
 387                         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 388                         memset(pHdr, 0, sizeof(OneHttpHeader));
 389                         pHdr->Val = Line;
 390                         Put(Hdr->HTTPHeaders, HKEY("GET /"), pHdr, DestroyHttpHeaderHandler);
 391                         lprintf(9, "%s\n", ChrPtr(Line));
 392                         isbogus = ReadHttpSubject(Hdr, Line, HeaderName);
 393                         if (isbogus) break;
 394                         continue;
 395                 }
 396
 397                 /* Do we need to Unfold? */
 398                 if ((LastLine != NULL) &&
 399                     (isspace(*ChrPtr(Line)))) {
 400                         pch = pchs = ChrPtr(Line);
 401                         pche = pchs + StrLength(Line);
 402                         while (isspace(*pch) && (pch < pche))
 403                                 pch ++;
 404                         StrBufCutLeft(Line, pch - pchs);
 405                         StrBufAppendBuf(LastLine, Line, 0);
 406
 407                         FreeStrBuf(&Line);
 408                         continue;
 409                 }
 410
 411                 StrBufSanitizeAscii(Line, '§');
 412                 StrBufExtract_token(HeaderName, Line, 0, ':');
 413
 414                 pchs = ChrPtr(Line);
 415                 pche = pchs + StrLength(Line);
 416                 pch = pchs + StrLength(HeaderName) + 1;
 417                 pche = pchs + StrLength(Line);
 418                 while ((pch < pche) && isspace(*pch))
 419                         pch ++;
 420                 StrBufCutLeft(Line, pch - pchs);
 421
 422                 StrBufUpCase(HeaderName);
 423
 424                 pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 425                 memset(pHdr, 0, sizeof(OneHttpHeader));
 426                 pHdr->Val = Line;
 427
 428                 if (GetHash(HttpHeaderHandler, SKEY(HeaderName), &vF) &&
 429                     (vF != NULL))
 430                 {
 431                         OneHttpHeader *FHdr = (OneHttpHeader*) vF;
 432                         pHdr->H = FHdr->H;
 433                         pHdr->HaveEvaluator = 1;
 434                 }
 435                 Put(Hdr->HTTPHeaders, SKEY(HeaderName), pHdr, DestroyHttpHeaderHandler);
 436                 LastLine = Line;
 437         } while (Line != NULL);
 438
 439         FreeStrBuf(&HeaderName);
 440
 441         return isbogus;
 442 }
 443
 444 void OverrideRequest(ParsedHttpHdrs *Hdr, const char *Line, long len)
 445 {
 446         StrBuf *Buf = NewStrBuf();
 447
 448         FlushStrBuf(Hdr->HR.ReqLine);
 449         StrBufPlain(Hdr->HR.ReqLine, Line, len);
 450         ReadHttpSubject(Hdr, Hdr->HR.ReqLine, Buf);
 451
 452         FreeStrBuf(&Buf);
 453 }
 454
 455 /*
 456  * handle one request
 457  *
 458  * This loop gets called once for every HTTP connection made to WebCit.  At
 459  * this entry point we have an HTTP socket with a browser allegedly on the
 460  * other end, but we have not yet bound to a WebCit session.
 461  *
 462  * The job of this function is to locate the correct session and bind to it,
 463  * or create a session if necessary and bind to it, then run the WebCit
 464  * transaction loop.  Afterwards, we unbind from the session.  When this
 465  * function returns, the worker thread is then free to handle another
 466  * transaction.
 467  */
 468 void context_loop(ParsedHttpHdrs *Hdr)
 469 {
 470         int isbogus = 0;
 471         wcsession *TheSession;
 472         struct timeval tx_start;
 473         struct timeval tx_finish;
 474
 475         gettimeofday(&tx_start, NULL);          /* start a stopwatch for performance timing */
 476
 477         /*
 478          * Find out what it is that the web browser is asking for
 479          */
 480         isbogus = ReadHTTPRequest(Hdr);
 481
 482         Hdr->HR.dav_depth = 32767; /* TODO: find a general way to have non-0 defaults */
 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, 1, 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, 1, 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, 0, &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 Header_HandleContentLength(StrBuf *Line, ParsedHttpHdrs *hdr)
 619 {
 620         hdr->HR.ContentLength = StrToi(Line);
 621 }
 622
 623 void Header_HandleContentType(StrBuf *Line, ParsedHttpHdrs *hdr)
 624 {
 625         hdr->HR.ContentType = Line;
 626 }
 627
 628 void Header_HandleUserAgent(StrBuf *Line, ParsedHttpHdrs *hdr)
 629 {
 630         hdr->HR.user_agent = Line;
 631 #ifdef TECH_PREVIEW
 632 /* TODO: do this later on session creating
 633         if ((WCC->is_mobile < 0) && is_mobile_ua(&buf[12])) {
 634                 WCC->is_mobile = 1;
 635         }
 636         else {
 637                 WCC->is_mobile = 0;
 638         }
 639 */
 640 #endif
 641 }
 642
 643
 644 void Header_HandleHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 645 {
 646         if ((follow_xff) && (hdr->HR.http_host != NULL))
 647                 return;
 648         else
 649                 hdr->HR.http_host = Line;
 650 }
 651
 652 void Header_HandleXFFHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 653 {
 654         if (follow_xff)
 655                 hdr->HR.http_host = Line;
 656 }
 657
 658
 659 void Header_HandleXFF(StrBuf *Line, ParsedHttpHdrs *hdr)
 660 {
 661         hdr->HR.browser_host = Line;
 662
 663         while (StrBufNum_tokens(hdr->HR.browser_host, ',') > 1) {
 664                 StrBufRemove_token(hdr->HR.browser_host, 0, ',');
 665         }
 666         StrBufTrim(hdr->HR.browser_host);
 667 }
 668
 669 void Header_HandleIfModSince(StrBuf *Line, ParsedHttpHdrs *hdr)
 670 {
 671         hdr->HR.if_modified_since = httpdate_to_timestamp(Line);
 672 }
 673
 674 void Header_HandleAcceptEncoding(StrBuf *Line, ParsedHttpHdrs *hdr)
 675 {
 676         /*
 677          * Can we compress?
 678          */
 679         if (strstr(&ChrPtr(Line)[16], "gzip")) {
 680                 hdr->HR.gzip_ok = 1;
 681         }
 682 }
 683 const char *ReqStrs[eNONE] = {
 684         "GET",
 685         "POST",
 686         "OPTIONS",
 687         "PROPFIND",
 688         "PUT",
 689         "DELETE",
 690         "HEAD",
 691         "MOVE",
 692         "COPY"
 693 };
 694
 695 void
 696 ServerStartModule_CONTEXT
 697 (void)
 698 {
 699         long *v;
 700         HttpReqTypes = NewHash(1, NULL);
 701         HttpHeaderHandler = NewHash(1, NULL);
 702
 703         v = malloc(sizeof(long));
 704         *v = eGET;
 705         Put(HttpReqTypes, HKEY("GET"), v, NULL);
 706
 707         v = malloc(sizeof(long));
 708         *v = ePOST;
 709         Put(HttpReqTypes, HKEY("POST"), v, NULL);
 710
 711         v = malloc(sizeof(long));
 712         *v = eOPTIONS;
 713         Put(HttpReqTypes, HKEY("OPTIONS"), v, NULL);
 714
 715         v = malloc(sizeof(long));
 716         *v = ePROPFIND;
 717         Put(HttpReqTypes, HKEY("PROPFIND"), v, NULL);
 718
 719         v = malloc(sizeof(long));
 720         *v = ePUT;
 721         Put(HttpReqTypes, HKEY("PUT"), v, NULL);
 722
 723         v = malloc(sizeof(long));
 724         *v = eDELETE;
 725         Put(HttpReqTypes, HKEY("DELETE"), v, NULL);
 726
 727         v = malloc(sizeof(long));
 728         *v = eHEAD;
 729         Put(HttpReqTypes, HKEY("HEAD"), v, NULL);
 730
 731         v = malloc(sizeof(long));
 732         *v = eMOVE;
 733         Put(HttpReqTypes, HKEY("MOVE"), v, NULL);
 734
 735         v = malloc(sizeof(long));
 736         *v = eCOPY;
 737         Put(HttpReqTypes, HKEY("COPY"), v, NULL);
 738 }
 739
 740 void
 741 ServerShutdownModule_CONTEXT
 742 (void)
 743 {
 744         DeleteHash(&HttpReqTypes);
 745         DeleteHash(&HttpHeaderHandler);
 746 }
 747
 748 void RegisterHeaderHandler(const char *Name, long Len, Header_Evaluator F)
 749 {
 750         OneHttpHeader *pHdr;
 751         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 752         memset(pHdr, 0, sizeof(OneHttpHeader));
 753         pHdr->H = F;
 754         Put(HttpHeaderHandler, Name, Len, pHdr, DestroyHttpHeaderHandler);
 755 }
 756
 757
 758 void
 759 InitModule_CONTEXT
 760 (void)
 761 {
 762         RegisterHeaderHandler(HKEY("CONTENT-LENGTH"), Header_HandleContentLength);
 763         RegisterHeaderHandler(HKEY("CONTENT-TYPE"), Header_HandleContentType);
 764         RegisterHeaderHandler(HKEY("USER-AGENT"), Header_HandleUserAgent);
 765         RegisterHeaderHandler(HKEY("X-FORWARDED-HOST"), Header_HandleXFFHost); /* Apache way... */
 766         RegisterHeaderHandler(HKEY("X-REAL-IP"), Header_HandleXFFHost);        /* NGinX way... */
 767         RegisterHeaderHandler(HKEY("HOST"), Header_HandleHost);
 768         RegisterHeaderHandler(HKEY("X-FORWARDED-FOR"), Header_HandleXFF);
 769         RegisterHeaderHandler(HKEY("ACCEPT-ENCODING"), Header_HandleAcceptEncoding);
 770         RegisterHeaderHandler(HKEY("IF-MODIFIED-SINCE"), Header_HandleIfModSince);
 771
 772         RegisterNamespace("CURRENT_USER", 0, 1, tmplput_current_user, NULL, CTX_NONE);
 773         RegisterNamespace("NONCE", 0, 0, tmplput_nonce, NULL, 0);
 774
 775         WebcitAddUrlHandler(HKEY("404"), "", 0, do_404, ANONYMOUS|COOKIEUNNEEDED);
 776 /*
 777  * Look for commonly-found probes of malware such as worms, viruses, trojans, and Microsoft Office.
 778  * Short-circuit these requests so we don't have to send them through the full processing loop.
 779  */
 780         WebcitAddUrlHandler(HKEY("scripts"), "", 0, do_404, ANONYMOUS|BOGUS);           /* /root.exe - Worms and trojans and viruses, oh my! */
 781         WebcitAddUrlHandler(HKEY("c"), "", 0, do_404, ANONYMOUS|BOGUS);         /* /winnt */
 782         WebcitAddUrlHandler(HKEY("MSADC"), "", 0, do_404, ANONYMOUS|BOGUS);
 783         WebcitAddUrlHandler(HKEY("_vti"), "", 0, do_404, ANONYMOUS|BOGUS);              /* Broken Microsoft DAV implementation */
 784         WebcitAddUrlHandler(HKEY("MSOffice"), "", 0, do_404, ANONYMOUS|BOGUS);          /* Stoopid MSOffice thinks everyone is IIS */
 785         WebcitAddUrlHandler(HKEY("nonexistenshit"), "", 0, do_404, ANONYMOUS|BOGUS);    /* Exploit found in the wild January 2009 */
 786 }
 787
 788
 789 void
 790 HttpNewModule_CONTEXT
 791 (ParsedHttpHdrs *httpreq)
 792 {
 793         httpreq->PlainArgs = NewStrBufPlain(NULL, SIZ);
 794         httpreq->this_page = NewStrBufPlain(NULL, SIZ);
 795 }
 796
 797 void
 798 HttpDetachModule_CONTEXT
 799 (ParsedHttpHdrs *httpreq)
 800 {
 801         FlushStrBuf(httpreq->PlainArgs);
 802         FlushStrBuf(httpreq->this_page);
 803         FlushStrBuf(httpreq->PlainArgs);
 804         DeleteHash(&httpreq->HTTPHeaders);
 805         memset(&httpreq->HR, 0, sizeof(HdrRefs));
 806 }
 807
 808 void
 809 HttpDestroyModule_CONTEXT
 810 (ParsedHttpHdrs *httpreq)
 811 {
 812         FreeStrBuf(&httpreq->this_page);
 813         FreeStrBuf(&httpreq->PlainArgs);
 814         FreeStrBuf(&httpreq->this_page);
 815         FreeStrBuf(&httpreq->PlainArgs);
 816         DeleteHash(&httpreq->HTTPHeaders);
 817
 818 }