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