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                         isbogus = ReadHttpSubject(Hdr, Line, HeaderName);
 358                         if (isbogus) break;
 359                         continue;
 360                 }
 361
 362                 /* Do we need to Unfold? */
 363                 if ((LastLine != NULL) &&
 364                     (isspace(*ChrPtr(Line)))) {
 365                         pch = pchs = ChrPtr(Line);
 366                         pche = pchs + StrLength(Line);
 367                         while (isspace(*pch) && (pch < pche))
 368                                 pch ++;
 369                         StrBufCutLeft(Line, pch - pchs);
 370                         StrBufAppendBuf(LastLine, Line, 0);
 371
 372                         FreeStrBuf(&Line);
 373                         continue;
 374                 }
 375
 376                 StrBufSanitizeAscii(Line, '§');
 377                 StrBufExtract_token(HeaderName, Line, 0, ':');
 378
 379                 pchs = ChrPtr(Line);
 380                 pch = pchs + StrLength(HeaderName) + 1;
 381                 pche = pchs + StrLength(Line);
 382                 while (isspace(*pch) && (pch < pche))
 383                         pch ++;
 384                 StrBufCutLeft(Line, pch - pchs);
 385
 386                 StrBufUpCase(HeaderName);
 387
 388                 pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 389                 memset(pHdr, 0, sizeof(OneHttpHeader));
 390                 pHdr->Val = Line;
 391
 392                 if (GetHash(HttpHeaderHandler, SKEY(HeaderName), &vF) &&
 393                     (vF != NULL))
 394                 {
 395                         OneHttpHeader *FHdr = (OneHttpHeader*) vF;
 396                         pHdr->H = FHdr->H;
 397                         pHdr->HaveEvaluator = 1;
 398                 }
 399                 Put(Hdr->HTTPHeaders, SKEY(HeaderName), pHdr, DestroyHttpHeaderHandler);
 400                 LastLine = Line;
 401         } while (Line != NULL);
 402
 403         FreeStrBuf(&HeaderName);
 404
 405         return isbogus;
 406 }
 407
 408
 409
 410 /*
 411  * handle one request
 412  *
 413  * This loop gets called once for every HTTP connection made to WebCit.  At
 414  * this entry point we have an HTTP socket with a browser allegedly on the
 415  * other end, but we have not yet bound to a WebCit session.
 416  *
 417  * The job of this function is to locate the correct session and bind to it,
 418  * or create a session if necessary and bind to it, then run the WebCit
 419  * transaction loop.  Afterwards, we unbind from the session.  When this
 420  * function returns, the worker thread is then free to handle another
 421  * transaction.
 422  */
 423 void context_loop(int *sock)
 424 {
 425         ParsedHttpHdrs Hdr;
 426         int isbogus = 0;
 427         wcsession *TheSession, *sptr;
 428         struct timeval tx_start;
 429         struct timeval tx_finish;
 430
 431         gettimeofday(&tx_start, NULL);          /* start a stopwatch for performance timing */
 432
 433         memset(&Hdr, 0, sizeof(ParsedHttpHdrs));
 434         Hdr.eReqType = eGET;
 435         Hdr.http_sock = *sock;
 436         /*
 437          * Find out what it is that the web browser is asking for
 438          */
 439         isbogus = ReadHTTPRequset(&Hdr);
 440
 441         if (!isbogus)
 442                 isbogus = AnalyseHeaders(&Hdr);
 443
 444         if (Hdr.got_auth == AUTH_BASIC)
 445                 CheckAuthBasic(&Hdr);
 446
 447 /*
 448         if (isbogus)
 449                 StrBufPlain(ReqLine, HKEY("/404"));
 450 TODO    HKEY("/static/nocookies.html?force_close_session=yes"));
 451 */
 452
 453 /*      dbg_PrintHash(HTTPHeaders, nix, NULL);  */
 454
 455
 456         /* Begin parsing the request. * /
 457 #ifdef TECH_PREVIEW
 458         if ((strncmp(ChrPtr(ReqLine), "/sslg", 5) != 0) &&
 459             (strncmp(ChrPtr(ReqLine), "/static/", 8) != 0) &&
 460             (strncmp(ChrPtr(ReqLine), "/tiny_mce/", 10) != 0) &&
 461             (strncmp(ChrPtr(ReqLine), "/wholist_section", 16) != 0) &&
 462             (strstr(ChrPtr(ReqLine), "wholist_section") == NULL)) {
 463 #endif
 464                 lprintf(5, "HTTP: %s %s\n", ReqStrs[Hdr.eReqType], ChrPtr(ReqLine));
 465 #ifdef TECH_PREVIEW
 466         }
 467 #endif
 468
 469 */
 470
 471         /**
 472          * See if there's an existing session open with the desired ID or user/pass
 473          */
 474         TheSession = NULL;
 475
 476         if (TheSession == NULL) {
 477                 pthread_mutex_lock(&SessionListMutex);
 478                 for (sptr = SessionList;
 479                      ((sptr != NULL) && (TheSession == NULL));
 480                       sptr = sptr->next) {
 481
 482                         /** If HTTP-AUTH, look for a session with matching credentials */
 483                         switch (Hdr.got_auth)
 484                         {
 485                         case AUTH_BASIC:
 486                                 if ( (Hdr.SessionKey != sptr->SessionKey))
 487                                         continue;
 488                                 GetAuthBasic(&Hdr);
 489                                 if ((!strcasecmp(ChrPtr(Hdr.c_username), ChrPtr(sptr->wc_username))) &&
 490                                     (!strcasecmp(ChrPtr(Hdr.c_password), ChrPtr(sptr->wc_password))) )
 491                                         TheSession = sptr;
 492                                 break;
 493                         case AUTH_COOKIE:
 494                         /** If cookie-session, look for a session with matching session ID */
 495                                 if ( (Hdr.desired_session != 0) &&
 496                                      (sptr->wc_session == Hdr.desired_session))
 497                                         TheSession = sptr;
 498                                 break;
 499                         case NO_AUTH:
 500                              break;
 501                         }
 502                 }
 503                 pthread_mutex_unlock(&SessionListMutex);
 504         }
 505
 506         /**
 507          * Create a new session if we have to
 508          */
 509         if (TheSession == NULL) {
 510                 lprintf(3, "Creating a new session\n");
 511                 TheSession = (wcsession *)
 512                         malloc(sizeof(wcsession));
 513                 memset(TheSession, 0, sizeof(wcsession));
 514                 TheSession->Hdr = &Hdr;
 515                 TheSession->SessionKey = Hdr.SessionKey;
 516                 TheSession->serv_sock = (-1);
 517                 TheSession->chat_sock = (-1);
 518
 519                 /* If we're recreating a session that expired, it's best to give it the same
 520                  * session number that it had before.  The client browser ought to pick up
 521                  * the new session number and start using it, but in some rare situations it
 522                  * doesn't, and that's a Bad Thing because it causes lots of spurious sessions
 523                  * to get created.
 524                  */
 525                 if (Hdr.desired_session == 0) {
 526                         TheSession->wc_session = GenerateSessionID();
 527                 }
 528                 else {
 529                         TheSession->wc_session = Hdr.desired_session;
 530                 }
 531
 532                 pthread_setspecific(MyConKey, (void *)TheSession);
 533                 session_new_modules(TheSession);
 534
 535                 pthread_mutex_init(&TheSession->SessionMutex, NULL);
 536                 pthread_mutex_lock(&SessionListMutex);
 537                 TheSession->nonce = rand();
 538                 TheSession->next = SessionList;
 539                 TheSession->is_mobile = -1;
 540                 SessionList = TheSession;
 541                 pthread_mutex_unlock(&SessionListMutex);
 542         }
 543
 544         /*
 545          * A future improvement might be to check the session integrity
 546          * at this point before continuing.
 547          */
 548
 549         /*
 550          * Bind to the session and perform the transaction
 551          */
 552         pthread_mutex_lock(&TheSession->SessionMutex);          /* bind */
 553         pthread_setspecific(MyConKey, (void *)TheSession);
 554
 555         TheSession->lastreq = time(NULL);                       /* log */
 556         TheSession->Hdr = &Hdr;
 557
 558         session_attach_modules(TheSession);
 559         session_loop();                         /* do transaction */
 560
 561
 562         /* How long did this transaction take? */
 563         gettimeofday(&tx_finish, NULL);
 564
 565         lprintf(9, "Transaction [%s] completed in %ld.%06ld seconds.\n",
 566                 ChrPtr(Hdr.this_page),
 567                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) / 1000000,
 568                 ((tx_finish.tv_sec*1000000 + tx_finish.tv_usec) - (tx_start.tv_sec*1000000 + tx_start.tv_usec)) % 1000000
 569         );
 570
 571         session_detach_modules(TheSession);
 572
 573         TheSession->Hdr = NULL;
 574         pthread_mutex_unlock(&TheSession->SessionMutex);        /* unbind */
 575
 576         http_destroy_modules(&Hdr);
 577 }
 578
 579 void tmplput_nonce(StrBuf *Target, WCTemplputParams *TP)
 580 {
 581         wcsession *WCC = WC;
 582         StrBufAppendPrintf(Target, "%ld",
 583                            (WCC != NULL)? WCC->nonce:0);
 584 }
 585
 586 void tmplput_current_user(StrBuf *Target, WCTemplputParams *TP)
 587 {
 588         StrBufAppendTemplate(Target, TP, WC->wc_fullname, 0);
 589 }
 590
 591 void tmplput_current_room(StrBuf *Target, WCTemplputParams *TP)
 592 {
 593         StrBufAppendTemplate(Target, TP, WC->wc_roomname, 0);
 594 }
 595
 596 void Header_HandleContentLength(StrBuf *Line, ParsedHttpHdrs *hdr)
 597 {
 598         hdr->ContentLength = StrToi(Line);
 599 }
 600
 601 void Header_HandleContentType(StrBuf *Line, ParsedHttpHdrs *hdr)
 602 {
 603         hdr->ContentType = Line;
 604 }
 605
 606 void Header_HandleUserAgent(StrBuf *Line, ParsedHttpHdrs *hdr)
 607 {
 608         hdr->user_agent = Line;
 609 #ifdef TECH_PREVIEW
 610 /* TODO: do this later on session creating
 611         if ((WCC->is_mobile < 0) && is_mobile_ua(&buf[12])) {
 612                 WCC->is_mobile = 1;
 613         }
 614         else {
 615                 WCC->is_mobile = 0;
 616         }
 617 */
 618 #endif
 619 }
 620
 621
 622 void Header_HandleHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 623 {
 624         if ((follow_xff) && (hdr->http_host != NULL))
 625                 return;
 626         else
 627                 hdr->http_host = Line;
 628 }
 629
 630 void Header_HandleXFFHost(StrBuf *Line, ParsedHttpHdrs *hdr)
 631 {
 632         if (follow_xff)
 633                 hdr->http_host = Line;
 634 }
 635
 636
 637 void Header_HandleXFF(StrBuf *Line, ParsedHttpHdrs *hdr)
 638 {
 639         hdr->browser_host = Line;
 640
 641         while (StrBufNum_tokens(hdr->browser_host, ',') > 1) {
 642                 StrBufRemove_token(hdr->browser_host, 0, ',');
 643         }
 644         StrBufTrim(hdr->browser_host);
 645 }
 646
 647 void Header_HandleIfModSince(StrBuf *Line, ParsedHttpHdrs *hdr)
 648 {
 649         hdr->if_modified_since = httpdate_to_timestamp(Line);
 650 }
 651
 652 void Header_HandleAcceptEncoding(StrBuf *Line, ParsedHttpHdrs *hdr)
 653 {
 654         /*
 655          * Can we compress?
 656          */
 657         if (strstr(&ChrPtr(Line)[16], "gzip")) {
 658                 hdr->gzip_ok = 1;
 659         }
 660 }
 661 const char *ReqStrs[eNONE] = {
 662         "GET",
 663         "POST",
 664         "OPTIONS",
 665         "PROPFIND",
 666         "PUT",
 667         "DELETE",
 668         "HEAD",
 669         "MOVE",
 670         "COPY"
 671 };
 672
 673 void
 674 ServerStartModule_CONTEXT
 675 (void)
 676 {
 677         long *v;
 678         HttpReqTypes = NewHash(1, NULL);
 679         HttpHeaderHandler = NewHash(1, NULL);
 680
 681         v = malloc(sizeof(long));
 682         *v = eGET;
 683         Put(HttpReqTypes, HKEY("GET"), v, NULL);
 684
 685         v = malloc(sizeof(long));
 686         *v = ePOST;
 687         Put(HttpReqTypes, HKEY("POST"), v, NULL);
 688
 689         v = malloc(sizeof(long));
 690         *v = eOPTIONS;
 691         Put(HttpReqTypes, HKEY("OPTIONS"), v, NULL);
 692
 693         v = malloc(sizeof(long));
 694         *v = ePROPFIND;
 695         Put(HttpReqTypes, HKEY("PROPFIND"), v, NULL);
 696
 697         v = malloc(sizeof(long));
 698         *v = ePUT;
 699         Put(HttpReqTypes, HKEY("PUT"), v, NULL);
 700
 701         v = malloc(sizeof(long));
 702         *v = eDELETE;
 703         Put(HttpReqTypes, HKEY("DELETE"), v, NULL);
 704
 705         v = malloc(sizeof(long));
 706         *v = eHEAD;
 707         Put(HttpReqTypes, HKEY("HEAD"), v, NULL);
 708
 709         v = malloc(sizeof(long));
 710         *v = eMOVE;
 711         Put(HttpReqTypes, HKEY("MOVE"), v, NULL);
 712
 713         v = malloc(sizeof(long));
 714         *v = eCOPY;
 715         Put(HttpReqTypes, HKEY("COPY"), v, NULL);
 716 }
 717
 718 void
 719 ServerShutdownModule_CONTEXT
 720 (void)
 721 {
 722         DeleteHash(&HttpReqTypes);
 723         DeleteHash(&HttpHeaderHandler);
 724 }
 725
 726 void RegisterHeaderHandler(const char *Name, long Len, Header_Evaluator F)
 727 {
 728         OneHttpHeader *pHdr;
 729         pHdr = (OneHttpHeader*) malloc(sizeof(OneHttpHeader));
 730         memset(pHdr, 0, sizeof(OneHttpHeader));
 731         pHdr->H = F;
 732         Put(HttpHeaderHandler, Name, Len, pHdr, DestroyHttpHeaderHandler);
 733 }
 734 extern void blank_page(void); ///TODO: remove me
 735 void
 736 InitModule_CONTEXT
 737 (void)
 738 {
 739         RegisterHeaderHandler(HKEY("CONTENT-LENGTH"), Header_HandleContentLength);
 740         RegisterHeaderHandler(HKEY("CONTENT-TYPE"), Header_HandleContentType);
 741         RegisterHeaderHandler(HKEY("USER-AGENT"), Header_HandleUserAgent);
 742         RegisterHeaderHandler(HKEY("X-FORWARDED-HOST"), Header_HandleXFFHost);
 743         RegisterHeaderHandler(HKEY("HOST"), Header_HandleHost);
 744         RegisterHeaderHandler(HKEY("X-FORWARDED-FOR"), Header_HandleXFF);
 745         RegisterHeaderHandler(HKEY("ACCEPT-ENCODING"), Header_HandleAcceptEncoding);
 746         RegisterHeaderHandler(HKEY("IF-MODIFIED-SINCE"), Header_HandleIfModSince);
 747
 748         RegisterNamespace("CURRENT_USER", 0, 1, tmplput_current_user, CTX_NONE);
 749         RegisterNamespace("CURRENT_ROOM", 0, 1, tmplput_current_room, CTX_NONE);
 750         RegisterNamespace("NONCE", 0, 0, tmplput_nonce, 0);
 751
 752
 753
 754         WebcitAddUrlHandler(HKEY("blank"), blank_page, ANONYMOUS|BOGUS);
 755
 756         WebcitAddUrlHandler(HKEY("webcit"), blank_page, URLNAMESPACE);
 757 }
 758
 759
 760
 761 void
 762 HttpDestroyModule_CONTEXT
 763 (ParsedHttpHdrs *httpreq)
 764 {
 765         FreeStrBuf(&httpreq->ReqLine);
 766         FreeStrBuf(&httpreq->ReadBuf);
 767         FreeStrBuf(&httpreq->PlainArgs);
 768         FreeStrBuf(&httpreq->this_page);
 769         DeleteHash(&httpreq->HTTPHeaders);
 770
 771 }