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->is_mobile = -1;
 191
 192         pthread_setspecific(MyConKey, (void *)TheSession);
 193
 194         /* If we're recreating a session that expired, it's best to give it the same
 195          * session number that it had before.  The client browser ought to pick up
 196          * the new session number and start using it, but in some rare situations it
 197          * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
 198          * to get created.
 199          */
 200         if (Hdr->HR.desired_session == 0) {
 201                 TheSession->wc_session = GenerateSessionID();
 202         }
 203         else {
 204                 TheSession->wc_session = Hdr->HR.desired_session;
 205         }
 206         Hdr->HR.Static = Static;
 207         session_new_modules(TheSession);
 208
 209         if (Lockable) {
 210                 pthread_mutex_init(&TheSession->SessionMutex, NULL);
 211
 212                 if (ListMutex != NULL)
 213                         pthread_mutex_lock(ListMutex);
 214
 215                 if (wclist != NULL) {
 216                         TheSession->nonce = rand();
 217                         TheSession->next = *wclist;
 218                         *wclist = TheSession;
 219                 }
 220                 if (ListMutex != NULL)
 221                         pthread_mutex_unlock(ListMutex);
 222         }
 223         return TheSession;
 224 }
 225
 226
 227 /*
 228  * Detects a 'mobile' user agent
 229  */
 230 int is_mobile_ua(char *user_agent) {
 231       if (strstr(user_agent,"iPhone OS") != NULL) {
 232         return 1;
 233       } else if (strstr(user_agent,"Windows CE") != NULL) {
 234         return 1;
 235       } else if (strstr(user_agent,"SymbianOS") != NULL) {
 236         return 1;
 237       } else if (strstr(user_agent, "Opera Mobi") != NULL) {
 238         return 1;
 239       } else if (strstr(user_agent, "Firefox/2.0.0 Opera 9.51 Beta") != NULL) {
 240               /*  For some reason a new install of Opera 9.51beta decided to spoof. */
 241           return 1;
 242           }
 243       return 0;
 244 }
 245
 246 /* If it's a "force 404" situation then display the error and bail. */
 247 void do_404(void)
 248 {
 249         hprintf("HTTP/1.1 404 Not found\r\n");
 250         hprintf("Content-Type: text/plain\r\n");
 251         wc_printf("Not found\r\n");
 252         end_burst();
 253 }
 254
 255 int ReadHttpSubject(ParsedHttpHdrs *Hdr, StrBuf *Line, StrBuf *Buf)
 256 {
 257         const char *Args;
 258         void *vLine, *vHandler;
 259         const char *Pos = NULL;
 260
 261
 262         Hdr->HR.ReqLine = Line;
 263         /* The requesttype... GET, POST... */
 264         StrBufExtract_token(Buf, Hdr->HR.ReqLine, 0, ' ');
 265         if (GetHash(HttpReqTypes, SKEY(Buf), &vLine) &&
 266             (vLine != NULL))
 267         {
 268                 Hdr->HR.eReqType = *(long*)vLine;
 269         }
 270         else {
 271                 Hdr->HR.eReqType = eGET;
 272                 return 1;
 273         }
 274         StrBufCutLeft(Hdr->HR.ReqLine, StrLength(Buf) + 1);
 275
 276         /* the HTTP Version... */
 277         StrBufExtract_token(Buf, Hdr->HR.ReqLine, 1, ' ');
 278         StrBufCutRight(Hdr->HR.ReqLine, StrLength(Buf) + 1);
 279
 280         if (StrLength(Buf) == 0) {
 281                 Hdr->HR.eReqType = eGET;
 282                 return 1;
 283         }
 284
 285         StrBufAppendBuf(Hdr->this_page, Hdr->HR.ReqLine, 0);
 286         /* chop Filename / query arguments */
 287         Args = strchr(ChrPtr(Hdr->HR.ReqLine), '?');
 288         if (Args == NULL) /* whe're not that picky about params... TODO: this will spoil '&' in filenames.*/
 289                 Args = strchr(ChrPtr(Hdr->HR.ReqLine), '&');
 290         if (Args != NULL) {
 291                 Args ++; /* skip the ? */
 292                 StrBufPlain(Hdr->PlainArgs,
 293                             Args,
 294                             StrLength(Hdr->HR.ReqLine) -
 295                             (Args - ChrPtr(Hdr->HR.ReqLine)));
 296                 StrBufCutAt(Hdr->HR.ReqLine, 0, Args - 1);
 297         } /* don't parse them yet, maybe we don't even care... */
 298
 299         /* now lookup what we are going to do with this... */
 300         /* skip first slash */
 301         StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
 302         do {
 303                 StrBufExtract_NextToken(Buf, Hdr->HR.ReqLine, &Pos, '/');
 304
 305                 GetHash(HandlerHash, SKEY(Buf), &vHandler),
 306                 Hdr->HR.Handler = (WebcitHandler*) vHandler;
 307                 if (Hdr->HR.Handler == NULL)
 308                         break;
 309                 /*
 310                  * If the request is prefixed by "/webcit" then chop that off.  This
 311                  * allows a front end web server to forward all /webcit requests to us
 312                  * while still using the same web server port for other things.
 313                  */
 314                 if ((Hdr->HR.Handler->Flags & URLNAMESPACE) != 0)
 315                         continue;
 316                 break;
 317         } while (1);
 318         /* remove the handlername from the URL */
 319         if ((Pos != NULL) && (Pos != StrBufNOTNULL)){
 320                 StrBufCutLeft(Hdr->HR.ReqLine,
 321                               Pos - ChrPtr(Hdr->HR.ReqLine));
 322         }
 323
 324         if (Hdr->HR.Handler != NULL) {
 325                 if ((Hdr->HR.Handler->Flags & BOGUS) != 0)
 326                         return 1;
 327                 Hdr->HR.DontNeedAuth = (
 328                         ((Hdr->HR.Handler->Flags & ISSTATIC) != 0) ||
 329                         ((Hdr->HR.Handler->Flags & ANONYMOUS) != 0)
 330                         );
 331         }
 332         else {
 333                 Hdr->HR.DontNeedAuth = 1; /* Flat request? show him the login screen... */
 334         }
 335
 336         return 0;
 337 }
 338
 339 int AnalyseHeaders(ParsedHttpHdrs *Hdr)
 340 {
 341         OneHttpHeader *pHdr;
 342         void *vHdr;
 343         long HKLen;
 344         const char *HashKey;
 345         HashPos *at = GetNewHashPos(Hdr->HTTPHeaders, 0);
 346
 347         while (GetNextHashPos(Hdr->HTTPHeaders, at, &HKLen, &HashKey, &vHdr) &&
 348                (vHdr != NULL)) {
 349                 pHdr = (OneHttpHeader *)vHdr;
 350                 if (pHdr->HaveEvaluator)
 351                         pHdr->H(pHdr->Val, Hdr);
 352
 353         }
 354         DeleteHashPos(&at);
 355         return 0;
 356 }
 357
 358 /*const char *nix(void *vptr) {return ChrPtr( (StrBuf*)vptr);}*/
 359
 360 /*
 361  * Read in the request
 362  */
 363 int ReadHTTPRequest (ParsedHttpHdrs *Hdr)
 364 {
 365         const char *pch, *pchs, *pche;
 366         OneHttpHeader *pHdr;
 367         StrBuf *Line, *LastLine, *HeaderName;
 368         int nLine = 0;
 369         void *vF;
 370         int isbogus = 0;
 371
 372         HeaderName = NewStrBuf();
 373         LastLine = NULL;
 374         do {
 375                 nLine ++;
 376                 Line = NewStrBufPlain(NULL, SIZ / 4);
 377
 378                 if (ClientGetLine(Hdr, Line) < 0) return 1;
 379
 380                 if (StrLength(Line) == 0) {
 381                         FreeStrBuf(&Line);
 382                         continue;
 383                 }
 384                 if (nLine == 1) {
 385                         Hdr->HTTPHeaders = NewHash(1, NULL);
 386                         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 387                         memset(pHdr, 0, sizeof(OneHttpHeader));
 388                         pHdr->Val = Line;
 389                         Put(Hdr->HTTPHeaders, HKEY("GET /"), pHdr, DestroyHttpHeaderHandler);
 390                         lprintf(9, "%s\n", ChrPtr(Line));
 391                         isbogus = ReadHttpSubject(Hdr, Line, HeaderName);
 392                         if (isbogus) break;
 393                         continue;
 394                 }
 395
 396                 /* Do we need to Unfold? */
 397                 if ((LastLine != NULL) &&
 398                     (isspace(*ChrPtr(Line)))) {
 399                         pch = pchs = ChrPtr(Line);
 400                         pche = pchs + StrLength(Line);
 401                         while (isspace(*pch) && (pch < pche))
 402                                 pch ++;
 403                         StrBufCutLeft(Line, pch - pchs);
 404                         StrBufAppendBuf(LastLine, Line, 0);
 405
 406                         FreeStrBuf(&Line);
 407                         continue;
 408                 }
 409
 410                 StrBufSanitizeAscii(Line, '§');
 411                 StrBufExtract_token(HeaderName, Line, 0, ':');
 412
 413                 pchs = ChrPtr(Line);
 414                 pche = pchs + StrLength(Line);
 415                 pch = pchs + StrLength(HeaderName) + 1;
 416                 pche = pchs + StrLength(Line);
 417                 while ((pch < pche) && isspace(*pch))
 418                         pch ++;
 419                 StrBufCutLeft(Line, pch - pchs);
 420
 421                 StrBufUpCase(HeaderName);
 422
 423                 pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 424                 memset(pHdr, 0, sizeof(OneHttpHeader));
 425                 pHdr->Val = Line;
 426
 427                 if (GetHash(HttpHeaderHandler, SKEY(HeaderName), &vF) &&
 428                     (vF != NULL))
 429                 {
 430                         OneHttpHeader *FHdr = (OneHttpHeader*) vF;
 431                         pHdr->H = FHdr->H;
 432                         pHdr->HaveEvaluator = 1;
 433                 }
 434                 Put(Hdr->HTTPHeaders, SKEY(HeaderName), pHdr, DestroyHttpHeaderHandler);
 435                 LastLine = Line;
 436         } while (Line != NULL);
 437
 438         FreeStrBuf(&HeaderName);
 439
 440         return isbogus;
 441 }
 442
 443 void OverrideRequest(ParsedHttpHdrs *Hdr, const char *Line, long len)
 444 {
 445         StrBuf *Buf = NewStrBuf();
 446
 447         FlushStrBuf(Hdr->HR.ReqLine);
 448         StrBufPlain(Hdr->HR.ReqLine, Line, len);
 449         ReadHttpSubject(Hdr, Hdr->HR.ReqLine, Buf);
 450
 451         FreeStrBuf(&Buf);
 452 }
 453
 454 /*
 455  * handle one request
 456  *
 457  * This loop gets called once for every HTTP connection made to WebCit.  At
 458  * this entry point we have an HTTP socket with a browser allegedly on the
 459  * other end, but we have not yet bound to a WebCit session.
 460  *
 461  * The job of this function is to locate the correct session and bind to it,
 462  * or create a session if necessary and bind to it, then run the WebCit
 463  * transaction loop.  Afterwards, we unbind from the session.  When this
 464  * function returns, the worker thread is then free to handle another
 465  * transaction.
 466  */
 467 void context_loop(ParsedHttpHdrs *Hdr)
 468 {
 469         int isbogus = 0;
 470         wcsession *TheSession;
 471         struct timeval tx_start;
 472         struct timeval tx_finish;
 473
 474         gettimeofday(&tx_start, NULL);          /* start a stopwatch for performance timing */
 475
 476         /*
 477          * Find out what it is that the web browser is asking for
 478          */
 479         isbogus = ReadHTTPRequest(Hdr);
 480
 481         Hdr->HR.dav_depth = 32767; /* TODO: find a general way to have non-0 defaults */
 482         if (!isbogus)
 483                 isbogus = AnalyseHeaders(Hdr);
 484
 485         if ((isbogus) ||
 486             ((Hdr->HR.Handler != NULL) &&
 487              ((Hdr->HR.Handler->Flags & BOGUS) != 0)))
 488         {
 489                 wcsession *Bogus;
 490
 491                 Bogus = CreateSession(0, 1, NULL, Hdr, NULL);
 492
 493                 do_404();
 494
 495                 lprintf(9, "HTTP: 404 [%ld.%06ld] %s %s \n",
 496                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 497                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
 498                         ReqStrs[Hdr->HR.eReqType],
 499                         ChrPtr(Hdr->this_page)
 500                         );
 501                 session_detach_modules(Bogus);
 502                 session_destroy_modules(&Bogus);
 503                 return;
 504         }
 505
 506         if ((Hdr->HR.Handler != NULL) && ((Hdr->HR.Handler->Flags & ISSTATIC) != 0))
 507         {
 508                 wcsession *Static;
 509                 Static = CreateSession(0, 1, NULL, Hdr, NULL);
 510
 511                 Hdr->HR.Handler->F();
 512
 513                 /* How long did this transaction take? */
 514                 gettimeofday(&tx_finish, NULL);
 515
 516 #ifdef TECH_PREVIEW
 517                 if ((Hdr->HR.Handler != NULL) ||
 518                     ((Hdr->HR.Handler->Flags & LOGCHATTY) == 0))
 519 #endif
 520                         lprintf(9, "HTTP: 200 [%ld.%06ld] %s %s \n",
 521                                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 522                                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
 523                                 ReqStrs[Hdr->HR.eReqType],
 524                                 ChrPtr(Hdr->this_page)
 525                                 );
 526                 session_detach_modules(Static);
 527                 session_destroy_modules(&Static);
 528                 return;
 529         }
 530
 531         if (Hdr->HR.got_auth == AUTH_BASIC) {
 532                 CheckAuthBasic(Hdr);
 533         }
 534
 535         /*
 536          * See if there's an existing session open with the desired ID or user/pass
 537          */
 538         TheSession = FindSession(&SessionList, Hdr, &SessionListMutex);
 539
 540         /*
 541          * Create a new session if we have to
 542          */
 543         if (TheSession == NULL) {
 544                 TheSession = CreateSession(1, 0, &SessionList, Hdr, &SessionListMutex);
 545
 546                 if ((StrLength(Hdr->c_username) == 0) && (!Hdr->HR.DontNeedAuth)) {
 547
 548                         if ((Hdr->HR.Handler != NULL) &&
 549                             (XHTTP_COMMANDS & Hdr->HR.Handler->Flags) == XHTTP_COMMANDS) {
 550                                 OverrideRequest(Hdr, HKEY("GET /401 HTTP/1.0"));
 551                                 Hdr->HR.prohibit_caching = 1;
 552                         }
 553                         else {
 554                                 OverrideRequest(Hdr, HKEY("GET /static/nocookies.html?force_close_session=yes HTTP/1.0"));
 555                                 Hdr->HR.prohibit_caching = 1;
 556                         }
 557                 }
 558
 559                 if (StrLength(Hdr->c_language) > 0) {
 560                         lprintf(9, "Session cookie requests language '%s'\n", ChrPtr(Hdr->c_language));
 561                         set_selected_language(ChrPtr(Hdr->c_language));
 562                         go_selected_language();
 563                 }
 564         }
 565
 566         /*
 567          * A future improvement might be to check the session integrity
 568          * at this point before continuing.
 569          */
 570
 571         /*
 572          * Bind to the session and perform the transaction
 573          */
 574         pthread_mutex_lock(&TheSession->SessionMutex);          /* bind */
 575         pthread_setspecific(MyConKey, (void *)TheSession);
 576
 577         TheSession->lastreq = time(NULL);                       /* log */
 578         TheSession->Hdr = Hdr;
 579
 580         session_attach_modules(TheSession);
 581         session_loop();                         /* do transaction */
 582
 583
 584         /* How long did this transaction take? */
 585         gettimeofday(&tx_finish, NULL);
 586
 587
 588 #ifdef TECH_PREVIEW
 589         if ((Hdr->HR.Handler != NULL) &&
 590             ((Hdr->HR.Handler->Flags & LOGCHATTY) == 0))
 591 #endif
 592                 lprintf(9, "HTTP: 200 [%ld.%06ld] %s %s \n",
 593                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 594                         ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000,
 595                         ReqStrs[Hdr->HR.eReqType],
 596                         ChrPtr(Hdr->this_page)
 597                         );
 598
 599         session_detach_modules(TheSession);
 600
 601         TheSession->Hdr = NULL;
 602         pthread_mutex_unlock(&TheSession->SessionMutex);        /* unbind */
 603 }
 604
 605 void tmplput_nonce(StrBuf *Target, WCTemplputParams *TP)
 606 {
 607         wcsession *WCC = WC;
 608         StrBufAppendPrintf(Target, "%ld",
 609                            (WCC != NULL)? WCC->nonce:0);
 610 }
 611
 612 void tmplput_current_user(StrBuf *Target, WCTemplputParams *TP)
 613 {
 614         StrBufAppendTemplate(Target, TP, WC->wc_fullname, 0);
 615 }
 616
 617 void Header_HandleContentLength(StrBuf *Line, ParsedHttpHdrs *hdr)
 618 {
 619         hdr->HR.ContentLength = StrToi(Line);
 620 }
 621
 622 void Header_HandleContentType(StrBuf *Line, ParsedHttpHdrs *hdr)
 623 {
 624         hdr->HR.ContentType = Line;
 625 }
 626
 627 void Header_HandleUserAgent(StrBuf *Line, ParsedHttpHdrs *hdr)
 628 {
 629         hdr->HR.user_agent = Line;
 630 #ifdef TECH_PREVIEW
 631 /* TODO: do this later on session creating
 632         if ((WCC->is_mobile < 0) && is_mobile_ua(&buf[12])) {
 633                 WCC->is_mobile = 1;
 634         }
 635         else {
 636                 WCC->is_mobile = 0;
 637         }
 638 */
 639 #endif
 640 }
 641
 642
 643 void Header_HandleHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 644 {
 645         if ((follow_xff) && (hdr->HR.http_host != NULL))
 646                 return;
 647         else
 648                 hdr->HR.http_host = Line;
 649 }
 650
 651 void Header_HandleXFFHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 652 {
 653         if (follow_xff)
 654                 hdr->HR.http_host = Line;
 655 }
 656
 657
 658 void Header_HandleXFF(StrBuf *Line, ParsedHttpHdrs *hdr)
 659 {
 660         hdr->HR.browser_host = Line;
 661
 662         while (StrBufNum_tokens(hdr->HR.browser_host, ',') > 1) {
 663                 StrBufRemove_token(hdr->HR.browser_host, 0, ',');
 664         }
 665         StrBufTrim(hdr->HR.browser_host);
 666 }
 667
 668 void Header_HandleIfModSince(StrBuf *Line, ParsedHttpHdrs *hdr)
 669 {
 670         hdr->HR.if_modified_since = httpdate_to_timestamp(Line);
 671 }
 672
 673 void Header_HandleAcceptEncoding(StrBuf *Line, ParsedHttpHdrs *hdr)
 674 {
 675         /*
 676          * Can we compress?
 677          */
 678         if (strstr(&ChrPtr(Line)[16], "gzip")) {
 679                 hdr->HR.gzip_ok = 1;
 680         }
 681 }
 682 const char *ReqStrs[eNONE] = {
 683         "GET",
 684         "POST",
 685         "OPTIONS",
 686         "PROPFIND",
 687         "PUT",
 688         "DELETE",
 689         "HEAD",
 690         "MOVE",
 691         "COPY"
 692 };
 693
 694 void
 695 ServerStartModule_CONTEXT
 696 (void)
 697 {
 698         long *v;
 699         HttpReqTypes = NewHash(1, NULL);
 700         HttpHeaderHandler = NewHash(1, NULL);
 701
 702         v = malloc(sizeof(long));
 703         *v = eGET;
 704         Put(HttpReqTypes, HKEY("GET"), v, NULL);
 705
 706         v = malloc(sizeof(long));
 707         *v = ePOST;
 708         Put(HttpReqTypes, HKEY("POST"), v, NULL);
 709
 710         v = malloc(sizeof(long));
 711         *v = eOPTIONS;
 712         Put(HttpReqTypes, HKEY("OPTIONS"), v, NULL);
 713
 714         v = malloc(sizeof(long));
 715         *v = ePROPFIND;
 716         Put(HttpReqTypes, HKEY("PROPFIND"), v, NULL);
 717
 718         v = malloc(sizeof(long));
 719         *v = ePUT;
 720         Put(HttpReqTypes, HKEY("PUT"), v, NULL);
 721
 722         v = malloc(sizeof(long));
 723         *v = eDELETE;
 724         Put(HttpReqTypes, HKEY("DELETE"), v, NULL);
 725
 726         v = malloc(sizeof(long));
 727         *v = eHEAD;
 728         Put(HttpReqTypes, HKEY("HEAD"), v, NULL);
 729
 730         v = malloc(sizeof(long));
 731         *v = eMOVE;
 732         Put(HttpReqTypes, HKEY("MOVE"), v, NULL);
 733
 734         v = malloc(sizeof(long));
 735         *v = eCOPY;
 736         Put(HttpReqTypes, HKEY("COPY"), v, NULL);
 737 }
 738
 739 void
 740 ServerShutdownModule_CONTEXT
 741 (void)
 742 {
 743         DeleteHash(&HttpReqTypes);
 744         DeleteHash(&HttpHeaderHandler);
 745 }
 746
 747 void RegisterHeaderHandler(const char *Name, long Len, Header_Evaluator F)
 748 {
 749         OneHttpHeader *pHdr;
 750         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 751         memset(pHdr, 0, sizeof(OneHttpHeader));
 752         pHdr->H = F;
 753         Put(HttpHeaderHandler, Name, Len, pHdr, DestroyHttpHeaderHandler);
 754 }
 755
 756
 757 void
 758 InitModule_CONTEXT
 759 (void)
 760 {
 761         RegisterHeaderHandler(HKEY("CONTENT-LENGTH"), Header_HandleContentLength);
 762         RegisterHeaderHandler(HKEY("CONTENT-TYPE"), Header_HandleContentType);
 763         RegisterHeaderHandler(HKEY("USER-AGENT"), Header_HandleUserAgent);
 764         RegisterHeaderHandler(HKEY("X-FORWARDED-HOST"), Header_HandleXFFHost); /* Apache way... */
 765         RegisterHeaderHandler(HKEY("X-REAL-IP"), Header_HandleXFFHost);        /* NGinX way... */
 766         RegisterHeaderHandler(HKEY("HOST"), Header_HandleHost);
 767         RegisterHeaderHandler(HKEY("X-FORWARDED-FOR"), Header_HandleXFF);
 768         RegisterHeaderHandler(HKEY("ACCEPT-ENCODING"), Header_HandleAcceptEncoding);
 769         RegisterHeaderHandler(HKEY("IF-MODIFIED-SINCE"), Header_HandleIfModSince);
 770
 771         RegisterNamespace("CURRENT_USER", 0, 1, tmplput_current_user, NULL, CTX_NONE);
 772         RegisterNamespace("NONCE", 0, 0, tmplput_nonce, NULL, 0);
 773
 774         WebcitAddUrlHandler(HKEY("404"), "", 0, do_404, ANONYMOUS|COOKIEUNNEEDED);
 775 /*
 776  * Look for commonly-found probes of malware such as worms, viruses, trojans, and Microsoft Office.
 777  * Short-circuit these requests so we don't have to send them through the full processing loop.
 778  */
 779         WebcitAddUrlHandler(HKEY("scripts"), "", 0, do_404, ANONYMOUS|BOGUS);           /* /root.exe - Worms and trojans and viruses, oh my! */
 780         WebcitAddUrlHandler(HKEY("c"), "", 0, do_404, ANONYMOUS|BOGUS);         /* /winnt */
 781         WebcitAddUrlHandler(HKEY("MSADC"), "", 0, do_404, ANONYMOUS|BOGUS);
 782         WebcitAddUrlHandler(HKEY("_vti"), "", 0, do_404, ANONYMOUS|BOGUS);              /* Broken Microsoft DAV implementation */
 783         WebcitAddUrlHandler(HKEY("MSOffice"), "", 0, do_404, ANONYMOUS|BOGUS);          /* Stoopid MSOffice thinks everyone is IIS */
 784         WebcitAddUrlHandler(HKEY("nonexistenshit"), "", 0, do_404, ANONYMOUS|BOGUS);    /* Exploit found in the wild January 2009 */
 785 }
 786
 787
 788 void
 789 HttpNewModule_CONTEXT
 790 (ParsedHttpHdrs *httpreq)
 791 {
 792         httpreq->PlainArgs = NewStrBufPlain(NULL, SIZ);
 793         httpreq->this_page = NewStrBufPlain(NULL, SIZ);
 794 }
 795
 796 void
 797 HttpDetachModule_CONTEXT
 798 (ParsedHttpHdrs *httpreq)
 799 {
 800         FlushStrBuf(httpreq->PlainArgs);
 801         FlushStrBuf(httpreq->this_page);
 802         FlushStrBuf(httpreq->PlainArgs);
 803         DeleteHash(&httpreq->HTTPHeaders);
 804         memset(&httpreq->HR, 0, sizeof(HdrRefs));
 805 }
 806
 807 void
 808 HttpDestroyModule_CONTEXT
 809 (ParsedHttpHdrs *httpreq)
 810 {
 811         FreeStrBuf(&httpreq->this_page);
 812         FreeStrBuf(&httpreq->PlainArgs);
 813         FreeStrBuf(&httpreq->this_page);
 814         FreeStrBuf(&httpreq->PlainArgs);
 815         DeleteHash(&httpreq->HTTPHeaders);
 816
 817 }