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
 140 /*
 141  * lingering_close() a`la Apache. see
 142  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 143  */
 144 int lingering_close(int fd)
 145 {
 146         char buf[SIZ];
 147         int i;
 148         fd_set set;
 149         struct timeval tv, start;
 150
 151         gettimeofday(&start, NULL);
 152         shutdown(fd, 1);
 153         do {
 154                 do {
 155                         gettimeofday(&tv, NULL);
 156                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 157                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 158                         if (tv.tv_usec < 0) {
 159                                 tv.tv_sec--;
 160                                 tv.tv_usec += 1000000;
 161                         }
 162                         FD_ZERO(&set);
 163                         FD_SET(fd, &set);
 164                         i = select(fd + 1, &set, NULL, NULL, &tv);
 165                 } while (i == -1 && errno == EINTR);
 166
 167                 if (i <= 0)
 168                         break;
 169
 170                 i = read(fd, buf, sizeof buf);
 171         } while (i != 0 && (i != -1 || errno == EINTR));
 172
 173         return close(fd);
 174 }
 175
 176
 177
 178
 179 /**
 180  * \brief Detects a 'mobile' user agent
 181  */
 182 int is_mobile_ua(char *user_agent) {
 183       if (strstr(user_agent,"iPhone OS") != NULL) {
 184         return 1;
 185       } else if (strstr(user_agent,"Windows CE") != NULL) {
 186         return 1;
 187       } else if (strstr(user_agent,"SymbianOS") != NULL) {
 188         return 1;
 189       } else if (strstr(user_agent, "Opera Mobi") != NULL) {
 190         return 1;
 191       } else if (strstr(user_agent, "Firefox/2.0.0 Opera 9.51 Beta") != NULL) {
 192               /*  For some reason a new install of Opera 9.51beta decided to spoof. */
 193           return 1;
 194           }
 195       return 0;
 196 }
 197
 198
 199
 200 /*
 201  * Look for commonly-found probes of malware such as worms, viruses, trojans, and Microsoft Office.
 202  * Short-circuit these requests so we don't have to send them through the full processing loop.
 203  */
 204 int is_bogus(StrBuf *http_cmd) {////TODO!
 205         const char *url;
 206         int i, max;
 207         const char *bogus_prefixes[] = {
 208                 "/scripts/root.exe",    /* Worms and trojans and viruses, oh my! */
 209                 "/c/winnt",
 210                 "/MSADC/",
 211                 "/_vti",                /* Broken Microsoft DAV implementation */
 212                 "/MSOffice",            /* Stoopid MSOffice thinks everyone is IIS */
 213                 "/nonexistenshit"       /* Exploit found in the wild January 2009 */
 214         };
 215
 216         url = ChrPtr(http_cmd);
 217         if (IsEmptyStr(url)) return(1);
 218         ++url;
 219
 220         max = sizeof(bogus_prefixes) / sizeof(char *);
 221
 222         for (i=0; i<max; ++i) {
 223                 if (!strncasecmp(url, bogus_prefixes[i], strlen(bogus_prefixes[i]))) {
 224                         return(2);
 225                 }
 226         }
 227
 228         return(0);      /* probably ok */
 229 }
 230
 231
 232 int ReadHttpSubject(ParsedHttpHdrs *Hdr, StrBuf *Line, StrBuf *Buf)
 233 {
 234         const char *Args;
 235         void *vLine, *vHandler;
 236         const char *Pos = NULL;
 237
 238
 239         Hdr->ReqLine = Line;
 240         /* The requesttype... GET, POST... */
 241         StrBufExtract_token(Buf, Hdr->ReqLine, 0, ' ');
 242         if (GetHash(HttpReqTypes, SKEY(Buf), &vLine) &&
 243             (vLine != NULL))
 244         {
 245                 Hdr->eReqType = *(long*)vLine;
 246         }
 247         else {
 248                 Hdr->eReqType = eGET;
 249                 return 1;
 250         }
 251         StrBufCutLeft(Hdr->ReqLine, StrLength(Buf) + 1);
 252
 253         /* the HTTP Version... */
 254         StrBufExtract_token(Buf, Hdr->ReqLine, 1, ' ');
 255         StrBufCutRight(Hdr->ReqLine, StrLength(Buf) + 1);
 256         if ((StrLength(Buf) == 0) ||
 257             is_bogus(Hdr->ReqLine)) {
 258                 Hdr->eReqType = eGET;
 259                 return 1;
 260         }
 261
 262         Hdr->this_page = NewStrBufDup(Hdr->ReqLine);
 263         /* chop Filename / query arguments */
 264         Args = strchr(ChrPtr(Hdr->ReqLine), '?');
 265         if (Args == NULL) /* whe're not that picky about params... TODO: this will spoil '&' in filenames.*/
 266                 Args = strchr(ChrPtr(Hdr->ReqLine), '&');
 267         if (Args != NULL) {
 268                 Args ++; /* skip the ? */
 269                 Hdr->PlainArgs = NewStrBufPlain(
 270                         Args,
 271                         StrLength(Hdr->ReqLine) -
 272                         (Args - ChrPtr(Hdr->ReqLine)));
 273                 StrBufCutAt(Hdr->ReqLine, 0, Args - 1);
 274         } /* don't parse them yet, maybe we don't even care... */
 275
 276         /* now lookup what we are going to do with this... */
 277         /* skip first slash */
 278         StrBufExtract_NextToken(Buf, Hdr->ReqLine, &Pos, '/');
 279         do {
 280                 StrBufExtract_NextToken(Buf, Hdr->ReqLine, &Pos, '/');
 281
 282                 GetHash(HandlerHash, SKEY(Buf), &vHandler),
 283                 Hdr->Handler = (WebcitHandler*) vHandler;
 284                 if (Hdr->Handler == NULL)
 285                         break;
 286                 /*
 287                  * If the request is prefixed by "/webcit" then chop that off.  This
 288                  * allows a front end web server to forward all /webcit requests to us
 289                  * while still using the same web server port for other things.
 290                  */
 291                 if ((Hdr->Handler->Flags & URLNAMESPACE) == 0)
 292                         break;
 293         } while (1);
 294         /* remove the handlername from the URL */
 295         if (Pos != NULL) {
 296                 StrBufCutLeft(Hdr->ReqLine,
 297                               Pos - ChrPtr(Hdr->ReqLine));
 298         }
 299
 300         if (Hdr->Handler != NULL) {
 301                 if ((Hdr->Handler->Flags & BOGUS) != 0)
 302                         return 1;
 303                 Hdr->DontNeedAuth = (Hdr->Handler->Flags & ISSTATIC) != 0;
 304         }
 305
 306         Hdr->HTTPHeaders = NewHash(1, NULL);
 307         return 0;
 308 }
 309
 310 int AnalyseHeaders(ParsedHttpHdrs *Hdr)
 311 {
 312         OneHttpHeader *pHdr;
 313         void *vHdr;
 314         long HKLen;
 315         const char *HashKey;
 316         HashPos *at = GetNewHashPos(Hdr->HTTPHeaders, 0);
 317
 318         while (GetNextHashPos(Hdr->HTTPHeaders, at, &HKLen, &HashKey, &vHdr) &&
 319                (vHdr != NULL)) {
 320                 pHdr = (OneHttpHeader *)vHdr;
 321                 if (pHdr->HaveEvaluator)
 322                         pHdr->H(pHdr->Val, Hdr);
 323
 324         }
 325         DeleteHashPos(&at);
 326         return 0;
 327 }
 328
 329 /*const char *nix(void *vptr) {return ChrPtr( (StrBuf*)vptr);}*/
 330
 331 /*
 332  * Read in the request
 333  */
 334 int ReadHTTPRequset (ParsedHttpHdrs *Hdr)
 335 {
 336         const char *pch, *pchs, *pche;
 337         OneHttpHeader *pHdr;
 338         StrBuf *Line, *LastLine, *HeaderName;
 339         int nLine = 0;
 340         void *vF;
 341         int isbogus = 0;
 342
 343         HeaderName = NewStrBuf();
 344         Hdr->ReadBuf = NewStrBuf();
 345         LastLine = NULL;
 346         do {
 347                 nLine ++;
 348                 Line = NewStrBuf();
 349
 350                 if (ClientGetLine(&Hdr->http_sock, Line, Hdr->ReadBuf, &Hdr->Pos) < 0) return 1;
 351
 352                 if (StrLength(Line) == 0) {
 353                         FreeStrBuf(&Line);
 354                         continue;
 355                 }
 356                 if (nLine == 1) {
 357                         lprintf(9, "%s\n", ChrPtr(Line));
 358                         isbogus = ReadHttpSubject(Hdr, Line, HeaderName);
 359                         if (isbogus) break;
 360                         continue;
 361                 }
 362
 363                 /* Do we need to Unfold? */
 364                 if ((LastLine != NULL) &&
 365                     (isspace(*ChrPtr(Line)))) {
 366                         pch = pchs = ChrPtr(Line);
 367                         pche = pchs + StrLength(Line);
 368                         while (isspace(*pch) && (pch < pche))
 369                                 pch ++;
 370                         StrBufCutLeft(Line, pch - pchs);
 371                         StrBufAppendBuf(LastLine, Line, 0);
 372
 373                         FreeStrBuf(&Line);
 374                         continue;
 375                 }
 376
 377                 StrBufSanitizeAscii(Line, '§');
 378                 StrBufExtract_token(HeaderName, Line, 0, ':');
 379
 380                 pchs = ChrPtr(Line);
 381                 pch = pchs + StrLength(HeaderName) + 1;
 382                 pche = pchs + StrLength(Line);
 383                 while (isspace(*pch) && (pch < pche))
 384                         pch ++;
 385                 StrBufCutLeft(Line, pch - pchs);
 386
 387                 StrBufUpCase(HeaderName);
 388
 389                 pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 390                 memset(pHdr, 0, sizeof(OneHttpHeader));
 391                 pHdr->Val = Line;
 392
 393                 if (GetHash(HttpHeaderHandler, SKEY(HeaderName), &vF) &&
 394                     (vF != NULL))
 395                 {
 396                         OneHttpHeader *FHdr = (OneHttpHeader*) vF;
 397                         pHdr->H = FHdr->H;
 398                         pHdr->HaveEvaluator = 1;
 399                 }
 400                 Put(Hdr->HTTPHeaders, SKEY(HeaderName), pHdr, DestroyHttpHeaderHandler);
 401                 LastLine = Line;
 402         } while (Line != NULL);
 403
 404         FreeStrBuf(&HeaderName);
 405
 406         return isbogus;
 407 }
 408
 409
 410
 411 /*
 412  * handle one request
 413  *
 414  * This loop gets called once for every HTTP connection made to WebCit.  At
 415  * this entry point we have an HTTP socket with a browser allegedly on the
 416  * other end, but we have not yet bound to a WebCit session.
 417  *
 418  * The job of this function is to locate the correct session and bind to it,
 419  * or create a session if necessary and bind to it, then run the WebCit
 420  * transaction loop.  Afterwards, we unbind from the session.  When this
 421  * function returns, the worker thread is then free to handle another
 422  * transaction.
 423  */
 424 void context_loop(int *sock)
 425 {
 426         ParsedHttpHdrs Hdr;
 427         int isbogus = 0;
 428         wcsession *TheSession, *sptr;
 429         struct timeval tx_start;
 430         struct timeval tx_finish;
 431
 432         gettimeofday(&tx_start, NULL);          /* start a stopwatch for performance timing */
 433
 434         memset(&Hdr, 0, sizeof(ParsedHttpHdrs));
 435         Hdr.eReqType = eGET;
 436         Hdr.http_sock = *sock;
 437         /*
 438          * Find out what it is that the web browser is asking for
 439          */
 440         isbogus = ReadHTTPRequset(&Hdr);
 441
 442         if (!isbogus)
 443                 isbogus = AnalyseHeaders(&Hdr);
 444
 445         if (Hdr.got_auth == AUTH_BASIC)
 446                 CheckAuthBasic(&Hdr);
 447
 448 /*
 449         if (isbogus)
 450                 StrBufPlain(ReqLine, HKEY("/404"));
 451 TODO    HKEY("/static/nocookies.html?force_close_session=yes"));
 452 */
 453
 454 /*      dbg_PrintHash(HTTPHeaders, nix, NULL);  */
 455
 456
 457         /* Begin parsing the request. * /
 458 #ifdef TECH_PREVIEW
 459         if ((strncmp(ChrPtr(ReqLine), "/sslg", 5) != 0) &&
 460             (strncmp(ChrPtr(ReqLine), "/static/", 8) != 0) &&
 461             (strncmp(ChrPtr(ReqLine), "/tiny_mce/", 10) != 0) &&
 462             (strncmp(ChrPtr(ReqLine), "/wholist_section", 16) != 0) &&
 463             (strstr(ChrPtr(ReqLine), "wholist_section") == NULL)) {
 464 #endif
 465                 lprintf(5, "HTTP: %s %s\n", ReqStrs[Hdr.eReqType], ChrPtr(ReqLine));
 466 #ifdef TECH_PREVIEW
 467         }
 468 #endif
 469
 470 */
 471
 472         /**
 473          * See if there's an existing session open with the desired ID or user/pass
 474          */
 475         TheSession = NULL;
 476
 477         if (TheSession == NULL) {
 478                 pthread_mutex_lock(&SessionListMutex);
 479                 for (sptr = SessionList;
 480                      ((sptr != NULL) && (TheSession == NULL));
 481                       sptr = sptr->next) {
 482
 483                         /** If HTTP-AUTH, look for a session with matching credentials */
 484                         switch (Hdr.got_auth)
 485                         {
 486                         case AUTH_BASIC:
 487                                 if ( (Hdr.SessionKey != sptr->SessionKey))
 488                                         continue;
 489                                 GetAuthBasic(&Hdr);
 490                                 if ((!strcasecmp(ChrPtr(Hdr.c_username), ChrPtr(sptr->wc_username))) &&
 491                                     (!strcasecmp(ChrPtr(Hdr.c_password), ChrPtr(sptr->wc_password))) )
 492                                         TheSession = sptr;
 493                                 break;
 494                         case AUTH_COOKIE:
 495                         /** If cookie-session, look for a session with matching session ID */
 496                                 if ( (Hdr.desired_session != 0) &&
 497                                      (sptr->wc_session == Hdr.desired_session))
 498                                         TheSession = sptr;
 499                                 break;
 500                         case NO_AUTH:
 501                              break;
 502                         }
 503                 }
 504                 pthread_mutex_unlock(&SessionListMutex);
 505         }
 506
 507         /**
 508          * Create a new session if we have to
 509          */
 510         if (TheSession == NULL) {
 511                 lprintf(3, "Creating a new session\n");
 512                 TheSession = (wcsession *)
 513                         malloc(sizeof(wcsession));
 514                 memset(TheSession, 0, sizeof(wcsession));
 515                 TheSession->Hdr = &Hdr;
 516                 TheSession->SessionKey = Hdr.SessionKey;
 517                 TheSession->serv_sock = (-1);
 518                 TheSession->chat_sock = (-1);
 519
 520                 /* If we're recreating a session that expired, it's best to give it the same
 521                  * session number that it had before.  The client browser ought to pick up
 522                  * the new session number and start using it, but in some rare situations it
 523                  * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
 524                  * to get created.
 525                  */
 526                 if (Hdr.desired_session == 0) {
 527                         TheSession->wc_session = GenerateSessionID();
 528                 }
 529                 else {
 530                         TheSession->wc_session = Hdr.desired_session;
 531                 }
 532
 533                 pthread_setspecific(MyConKey, (void *)TheSession);
 534                 session_new_modules(TheSession);
 535
 536                 pthread_mutex_init(&TheSession->SessionMutex, NULL);
 537                 pthread_mutex_lock(&SessionListMutex);
 538                 TheSession->nonce = rand();
 539                 TheSession->next = SessionList;
 540                 TheSession->is_mobile = -1;
 541                 SessionList = TheSession;
 542                 pthread_mutex_unlock(&SessionListMutex);
 543
 544                 if (StrLength(Hdr.c_language) > 0) {
 545                         lprintf(9, "Session cookie requests language '%s'\n", ChrPtr(Hdr.c_language));
 546                         set_selected_language(ChrPtr(Hdr.c_language));
 547                         go_selected_language();
 548                 }
 549         }
 550
 551         /*
 552          * A future improvement might be to check the session integrity
 553          * at this point before continuing.
 554          */
 555
 556         /*
 557          * Bind to the session and perform the transaction
 558          */
 559         pthread_mutex_lock(&TheSession->SessionMutex);          /* bind */
 560         pthread_setspecific(MyConKey, (void *)TheSession);
 561
 562         TheSession->lastreq = time(NULL);                       /* log */
 563         TheSession->Hdr = &Hdr;
 564
 565         session_attach_modules(TheSession);
 566         session_loop();                         /* do transaction */
 567
 568
 569         /* How long did this transaction take? */
 570         gettimeofday(&tx_finish, NULL);
 571
 572         lprintf(9, "Transaction [%s] completed in %ld.%06ld seconds.\n",
 573                 ChrPtr(Hdr.this_page),
 574                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 575                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000
 576         );
 577
 578         session_detach_modules(TheSession);
 579
 580         TheSession->Hdr = NULL;
 581         pthread_mutex_unlock(&TheSession->SessionMutex);        /* unbind */
 582
 583         http_destroy_modules(&Hdr);
 584 }
 585
 586 void tmplput_nonce(StrBuf *Target, WCTemplputParams *TP)
 587 {
 588         wcsession *WCC = WC;
 589         StrBufAppendPrintf(Target, "%ld",
 590                            (WCC != NULL)? WCC->nonce:0);
 591 }
 592
 593 void tmplput_current_user(StrBuf *Target, WCTemplputParams *TP)
 594 {
 595         StrBufAppendTemplate(Target, TP, WC->wc_fullname, 0);
 596 }
 597
 598 void tmplput_current_room(StrBuf *Target, WCTemplputParams *TP)
 599 {
 600         StrBufAppendTemplate(Target, TP, WC->wc_roomname, 0);
 601 }
 602
 603 void Header_HandleContentLength(StrBuf *Line, ParsedHttpHdrs *hdr)
 604 {
 605         hdr->ContentLength = StrToi(Line);
 606 }
 607
 608 void Header_HandleContentType(StrBuf *Line, ParsedHttpHdrs *hdr)
 609 {
 610         hdr->ContentType = Line;
 611 }
 612
 613 void Header_HandleUserAgent(StrBuf *Line, ParsedHttpHdrs *hdr)
 614 {
 615         hdr->user_agent = Line;
 616 #ifdef TECH_PREVIEW
 617 /* TODO: do this later on session creating
 618         if ((WCC->is_mobile < 0) && is_mobile_ua(&buf[12])) {
 619                 WCC->is_mobile = 1;
 620         }
 621         else {
 622                 WCC->is_mobile = 0;
 623         }
 624 */
 625 #endif
 626 }
 627
 628
 629 void Header_HandleHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 630 {
 631         if ((follow_xff) && (hdr->http_host != NULL))
 632                 return;
 633         else
 634                 hdr->http_host = Line;
 635 }
 636
 637 void Header_HandleXFFHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 638 {
 639         if (follow_xff)
 640                 hdr->http_host = Line;
 641 }
 642
 643
 644 void Header_HandleXFF(StrBuf *Line, ParsedHttpHdrs *hdr)
 645 {
 646         hdr->browser_host = Line;
 647
 648         while (StrBufNum_tokens(hdr->browser_host, ',') > 1) {
 649                 StrBufRemove_token(hdr->browser_host, 0, ',');
 650         }
 651         StrBufTrim(hdr->browser_host);
 652 }
 653
 654 void Header_HandleIfModSince(StrBuf *Line, ParsedHttpHdrs *hdr)
 655 {
 656         hdr->if_modified_since = httpdate_to_timestamp(Line);
 657 }
 658
 659 void Header_HandleAcceptEncoding(StrBuf *Line, ParsedHttpHdrs *hdr)
 660 {
 661         /*
 662          * Can we compress?
 663          */
 664         if (strstr(&ChrPtr(Line)[16], "gzip")) {
 665                 hdr->gzip_ok = 1;
 666         }
 667 }
 668 const char *ReqStrs[eNONE] = {
 669         "GET",
 670         "POST",
 671         "OPTIONS",
 672         "PROPFIND",
 673         "PUT",
 674         "DELETE",
 675         "HEAD",
 676         "MOVE",
 677         "COPY"
 678 };
 679
 680 void
 681 ServerStartModule_CONTEXT
 682 (void)
 683 {
 684         long *v;
 685         HttpReqTypes = NewHash(1, NULL);
 686         HttpHeaderHandler = NewHash(1, NULL);
 687
 688         v = malloc(sizeof(long));
 689         *v = eGET;
 690         Put(HttpReqTypes, HKEY("GET"), v, NULL);
 691
 692         v = malloc(sizeof(long));
 693         *v = ePOST;
 694         Put(HttpReqTypes, HKEY("POST"), v, NULL);
 695
 696         v = malloc(sizeof(long));
 697         *v = eOPTIONS;
 698         Put(HttpReqTypes, HKEY("OPTIONS"), v, NULL);
 699
 700         v = malloc(sizeof(long));
 701         *v = ePROPFIND;
 702         Put(HttpReqTypes, HKEY("PROPFIND"), v, NULL);
 703
 704         v = malloc(sizeof(long));
 705         *v = ePUT;
 706         Put(HttpReqTypes, HKEY("PUT"), v, NULL);
 707
 708         v = malloc(sizeof(long));
 709         *v = eDELETE;
 710         Put(HttpReqTypes, HKEY("DELETE"), v, NULL);
 711
 712         v = malloc(sizeof(long));
 713         *v = eHEAD;
 714         Put(HttpReqTypes, HKEY("HEAD"), v, NULL);
 715
 716         v = malloc(sizeof(long));
 717         *v = eMOVE;
 718         Put(HttpReqTypes, HKEY("MOVE"), v, NULL);
 719
 720         v = malloc(sizeof(long));
 721         *v = eCOPY;
 722         Put(HttpReqTypes, HKEY("COPY"), v, NULL);
 723 }
 724
 725 void
 726 ServerShutdownModule_CONTEXT
 727 (void)
 728 {
 729         DeleteHash(&HttpReqTypes);
 730         DeleteHash(&HttpHeaderHandler);
 731 }
 732
 733 void RegisterHeaderHandler(const char *Name, long Len, Header_Evaluator F)
 734 {
 735         OneHttpHeader *pHdr;
 736         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 737         memset(pHdr, 0, sizeof(OneHttpHeader));
 738         pHdr->H = F;
 739         Put(HttpHeaderHandler, Name, Len, pHdr, DestroyHttpHeaderHandler);
 740 }
 741 extern void blank_page(void); ///TODO: remove me
 742 void
 743 InitModule_CONTEXT
 744 (void)
 745 {
 746         RegisterHeaderHandler(HKEY("CONTENT-LENGTH"), Header_HandleContentLength);
 747         RegisterHeaderHandler(HKEY("CONTENT-TYPE"), Header_HandleContentType);
 748         RegisterHeaderHandler(HKEY("USER-AGENT"), Header_HandleUserAgent);
 749         RegisterHeaderHandler(HKEY("X-FORWARDED-HOST"), Header_HandleXFFHost);
 750         RegisterHeaderHandler(HKEY("HOST"), Header_HandleHost);
 751         RegisterHeaderHandler(HKEY("X-FORWARDED-FOR"), Header_HandleXFF);
 752         RegisterHeaderHandler(HKEY("ACCEPT-ENCODING"), Header_HandleAcceptEncoding);
 753         RegisterHeaderHandler(HKEY("IF-MODIFIED-SINCE"), Header_HandleIfModSince);
 754
 755         RegisterNamespace("CURRENT_USER", 0, 1, tmplput_current_user, CTX_NONE);
 756         RegisterNamespace("CURRENT_ROOM", 0, 1, tmplput_current_room, CTX_NONE);
 757         RegisterNamespace("NONCE", 0, 0, tmplput_nonce, 0);
 758
 759
 760
 761         WebcitAddUrlHandler(HKEY("blank"), blank_page, ANONYMOUS|BOGUS);
 762
 763         WebcitAddUrlHandler(HKEY("webcit"), blank_page, URLNAMESPACE);
 764 }
 765
 766
 767
 768 void
 769 HttpDestroyModule_CONTEXT
 770 (ParsedHttpHdrs *httpreq)
 771 {
 772         FreeStrBuf(&httpreq->ReqLine);
 773         FreeStrBuf(&httpreq->ReadBuf);
 774         FreeStrBuf(&httpreq->PlainArgs);
 775         FreeStrBuf(&httpreq->this_page);
 776         DeleteHash(&httpreq->HTTPHeaders);
 777
 778 }