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