Annotation of libwww/Library/src/HTHost.c, revision 2.12.2.1
2.1 frystyk 1: /* HTHost.c
2: ** REMOTE HOST INFORMATION
3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.12.2.1! eric 6: ** @(#) $Id: HTHost.c,v 2.12 1996/10/07 02:04:46 frystyk Exp $
2.1 frystyk 7: **
8: ** This object manages the information that we know about a remote host.
9: ** This can for example be what type of host it is, and what version
10: ** it is using. We also keep track of persistent connections
11: **
12: ** April 96 HFN Written
13: */
14:
15: /* Library include files */
16: #include "sysdep.h"
17: #include "WWWUtil.h"
18: #include "HTParse.h"
19: #include "HTAlert.h"
20: #include "HTError.h"
21: #include "HTNetMan.h"
22: #include "HTTrans.h"
2.12.2.1! eric 23: #include "HTDNS.h"
2.1 frystyk 24: #include "HTHost.h" /* Implemented here */
2.12.2.1! eric 25: #include "HTHstMan.h"
! 26:
! 27: #include "HTTPUtil.h"
! 28: #include "HTTCP.h"
! 29: #include "HTWatch.h"
2.1 frystyk 30:
31: #define HOST_TIMEOUT 43200L /* Default host timeout is 12 h */
32: #define TCP_TIMEOUT 3600L /* Default TCP timeout i 1 h */
33: #define HASH_SIZE 67
2.12.2.1! eric 34: #define MAX_PIPES 5 /* maximum number of pipelined requests */
2.1 frystyk 35:
2.12.2.1! eric 36: struct _HTInputStream {
! 37: const HTInputStreamClass * isa;
2.1 frystyk 38: };
39:
2.12.2.1! eric 40: PRIVATE int HostEvent(SOCKET soc, void * pVoid, HTEvent_type type);
! 41:
! 42: /* Type definitions and global variables etc. local to this module */
2.1 frystyk 43: PRIVATE time_t HostTimeout = HOST_TIMEOUT; /* Timeout on host entries */
44: PRIVATE time_t TCPTimeout = TCP_TIMEOUT; /* Timeout on persistent channels */
45:
2.8 frystyk 46: PRIVATE HTList ** HostTable = NULL;
47: PRIVATE HTList * PendHost = NULL; /* List of pending host elements */
2.1 frystyk 48:
49: /* ------------------------------------------------------------------------- */
50:
51: PRIVATE void free_object (HTHost * me)
52: {
53: if (me) {
54: HT_FREE(me->hostname);
55: HT_FREE(me->type);
2.12 frystyk 56: HT_FREE(me->server);
57: HT_FREE(me->user_agent);
58: HT_FREE(me->range_units);
2.3 eric 59: if (me->channel) {
2.5 eric 60: HTChannel_delete(me->channel, HT_OK);
2.3 eric 61: me->channel = NULL;
62: }
2.8 frystyk 63: HTList_delete(me->pipeline);
64: HTList_delete(me->pending);
2.1 frystyk 65: HT_FREE(me);
66: }
67: }
68:
69: PRIVATE BOOL delete_object (HTList * list, HTHost * me)
70: {
2.2 frystyk 71: if (CORE_TRACE) HTTrace("Host info... object %p from list %p\n", me, list);
2.1 frystyk 72: HTList_removeObject(list, (void *) me);
73: free_object(me);
74: return YES;
75: }
76:
2.12.2.1! eric 77: PRIVATE BOOL isLastInPipe (HTHost * host, HTNet * net)
! 78: {
! 79: return HTList_lastObject(host->pipeline) == net;
! 80: }
! 81:
! 82: /*
! 83: ** HostEvent - host event manager - recieves events from the event
! 84: ** manager and dispatches them to the client net objects by calling the
! 85: ** net object's cbf.
! 86: **
! 87: */
! 88: PRIVATE int HostEvent (SOCKET soc, void * pVoid, HTEvent_type type)
! 89: {
! 90: HTHost * host = (HTHost *)pVoid;
! 91:
! 92: if (type == HTEvent_READ) {
! 93: HTNet * targetNet;
! 94:
! 95: /* call the first net object */
! 96: do {
! 97: int ret;
! 98: targetNet = (HTNet *)HTList_firstObject(host->pipeline);
! 99: if (targetNet) {
! 100: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: READ passed to %s.\n"),
! 101: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
! 102: if ((ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel),
! 103: targetNet->event.param, type)) != HT_OK)
! 104: return ret;
! 105: }
! 106: /* call pipelined net object to eat all the data in the channel */
! 107: } while (host->remainingRead > 0);
! 108:
! 109: /* last target net should have set remainingRead to 0 */
! 110: if (targetNet)
! 111: return HT_OK;
! 112:
! 113: /* If there was notargetNet, it should be a close */
! 114: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: host %s closed connection.\n"),
! 115: host->hostname);
! 116:
! 117: /* Is there garbage in the channel? Let's check: */
! 118: {
! 119: char buf[256];
! 120: int ret;
! 121: while ((ret = NETREAD(HTChannel_socket(host->channel), buf, sizeof(buf))) > 0)
! 122: HTWATCH(HTWatch_TCP, host, HTHIDE("Host %s had %d extraneous bytes.\n"));
! 123: }
! 124: HTHost_clearChannel(host, HT_OK);
! 125: return HT_OK; /* extra garbage does not constitute an application error */
! 126:
! 127: } else if (type == HTEvent_WRITE) {
! 128: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
! 129: if (targetNet) {
! 130: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: WRITE passed to %s.\n"),
! 131: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
! 132: return (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, type);
! 133: }
! 134: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: Who wants to write to %s?\n"),
! 135: host->hostname);
! 136: return HT_ERROR;
! 137: }
! 138:
! 139: HTWATCH(HTWatch_TCP, host, HTHIDE("Don't know how to handle OOB data from %s?\n"),
! 140: host->hostname);
! 141: return HT_OK;
! 142: }
! 143:
2.1 frystyk 144: /*
145: ** Search the host info cache for a host object or create a new one
146: ** and add it. Examples of host names are
147: **
148: ** www.w3.org
149: ** www.foo.com:8000
150: ** 18.52.0.18
151: **
152: ** Returns Host object or NULL if error. You may get back an already
153: ** existing host object - you're not guaranteed a new one each time.
154: */
2.12.2.1! eric 155:
2.1 frystyk 156: PUBLIC HTHost * HTHost_new (char * host)
157: {
158: HTList * list = NULL; /* Current list in cache */
159: HTHost * pres = NULL;
160: if (!host) {
2.2 frystyk 161: if (CORE_TRACE) HTTrace("Host info... Bad argument\n");
2.1 frystyk 162: return NULL;
163: }
164:
165: /* Find a hash for this host */
166: {
167: int hash = 0;
168: char *ptr;
169: for (ptr=host; *ptr; ptr++)
170: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HASH_SIZE);
171: if (!HostTable) {
172: if ((HostTable = (HTList **) HT_CALLOC(HASH_SIZE,
173: sizeof(HTList *))) == NULL)
174: HT_OUTOFMEM("HTHost_find");
175: }
176: if (!HostTable[hash]) HostTable[hash] = HTList_new();
177: list = HostTable[hash];
178: }
179:
180: /* Search the cache */
181: {
182: HTList * cur = list;
183: while ((pres = (HTHost *) HTList_nextObject(cur))) {
184: if (!strcmp(pres->hostname, host)) {
2.8 frystyk 185: if (HTHost_isIdle(pres) && time(NULL)>pres->ntime+HostTimeout){
2.2 frystyk 186: if (CORE_TRACE)
2.1 frystyk 187: HTTrace("Host info... Collecting host info %p\n",pres);
188: delete_object(list, pres);
189: pres = NULL;
190: }
191: break;
192: }
193: }
194: }
195:
2.8 frystyk 196: /* If not found then create new Host object, else use existing one */
2.1 frystyk 197: if (pres) {
198: if (pres->channel) {
199: if (pres->expires < time(NULL)) { /* Cached channel is cold */
2.2 frystyk 200: if (CORE_TRACE)
2.1 frystyk 201: HTTrace("Host info... Persistent channel %p gotten cold\n",
202: pres->channel);
2.5 eric 203: HTChannel_delete(pres->channel, HT_OK);
2.1 frystyk 204: pres->channel = NULL;
205: } else {
2.2 frystyk 206: if (CORE_TRACE)
2.1 frystyk 207: HTTrace("Host info... REUSING CHANNEL %p\n",pres->channel);
208: }
209: }
210: } else {
2.12.2.1! eric 211: /* temporary event structure to COPY into host structure */
! 212: HTEvent newEvent = {HT_PRIORITY_MAX, HostEvent, pres, NULL};
! 213:
2.1 frystyk 214: if ((pres = (HTHost *) HT_CALLOC(1, sizeof(HTHost))) == NULL)
215: HT_OUTOFMEM("HTHost_add");
216: StrAllocCopy(pres->hostname, host);
217: pres->ntime = time(NULL);
2.8 frystyk 218: pres->mode = HT_TP_SINGLE;
2.12.2.1! eric 219: newEvent.param = pres;
! 220: pres->events[HTEvent_INDEX(HTEvent_READ)] = newEvent;
! 221: pres->events[HTEvent_INDEX(HTEvent_WRITE)] = newEvent;
2.2 frystyk 222: if (CORE_TRACE)
2.1 frystyk 223: HTTrace("Host info... added `%s\' to list %p\n", host, list);
224: HTList_addObject(list, (void *) pres);
225: }
226: return pres;
2.9 frystyk 227: }
228:
2.12.2.1! eric 229: PUBLIC HTHost * HTHost_newWParse (HTRequest * request, char * url, u_short default_port)
! 230: {
! 231: char * port;
! 232: char * fullhost = NULL;
! 233: char * parsedHost = NULL;
! 234: SockA * sin;
! 235: HTHost * me;
! 236: char * proxy = HTRequest_proxy(request);
! 237:
! 238: fullhost = HTParse(proxy ? proxy : url, "", PARSE_HOST);
! 239:
! 240: /* If there's an @ then use the stuff after it as a hostname */
! 241: if (fullhost) {
! 242: char * at_sign;
! 243: if ((at_sign = strchr(fullhost, '@')) != NULL)
! 244: parsedHost = at_sign+1;
! 245: else
! 246: parsedHost = fullhost;
! 247: }
! 248: if (!parsedHost || !*parsedHost) {
! 249: HTRequest_addError(request, ERR_FATAL, NO, HTERR_NO_HOST,
! 250: NULL, 0, "HTDoConnect");
! 251: HT_FREE(fullhost);
! 252: return NULL;
! 253: }
! 254: port = strchr(parsedHost, ':');
! 255: if (PROT_TRACE)
! 256: HTTrace("HTDoConnect. Looking up `%s\'\n", parsedHost);
! 257: if (port) {
! 258: *port++ = '\0';
! 259: if (!*port || !isdigit(*port))
! 260: port = 0;
! 261: }
! 262: /* Find information about this host */
! 263: if ((me = HTHost_new(parsedHost)) == NULL) {
! 264: if (PROT_TRACE)HTTrace("HTDoConnect. Can't get host info\n");
! 265: me->tcpstate = TCP_ERROR;
! 266: return NULL;
! 267: }
! 268: HT_FREE(fullhost); /* parsedHost points into fullhost */
! 269: sin = &me->sock_addr;
! 270: memset((void *) sin, '\0', sizeof(SockA));
! 271:
! 272: #ifdef DECNET
! 273: sin->sdn_family = AF_DECnet;
! 274: net->sock_addr.sdn_objnum = port ? (unsigned char)(strtol(port, (char **) 0, 10)) : DNP_OBJ;
! 275: #else /* Internet */
! 276: sin->sin_family = AF_INET;
! 277: sin->sin_port = htons(port ? atol(port) : default_port);
! 278: #endif
! 279: return me;
! 280: }
! 281:
2.9 frystyk 282: /*
283: ** Search the host info cache for a host object. Examples of host names:
284: **
285: ** www.w3.org
286: ** www.foo.com:8000
287: ** 18.52.0.18
288: **
289: ** Returns Host object or NULL if not found.
290: */
291: PUBLIC HTHost * HTHost_find (char * host)
292: {
293: HTList * list = NULL; /* Current list in cache */
294: HTHost * pres = NULL;
295: if (CORE_TRACE)
296: HTTrace("Host info... Looking for `%s\'\n", host ? host : "<null>");
297:
298: /* Find a hash for this host */
299: if (host && HostTable) {
300: int hash = 0;
301: char *ptr;
302: for (ptr=host; *ptr; ptr++)
303: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HASH_SIZE);
304: if (!HostTable[hash]) return NULL;
305: list = HostTable[hash];
306:
307: /* Search the cache */
308: {
309: HTList * cur = list;
310: while ((pres = (HTHost *) HTList_nextObject(cur))) {
311: if (!strcmp(pres->hostname, host)) {
312: if (time(NULL) > pres->ntime + HostTimeout) {
313: if (CORE_TRACE)
314: HTTrace("Host info... Collecting host %p\n", pres);
315: delete_object(list, pres);
316: pres = NULL;
317: } else {
318: if (CORE_TRACE)
319: HTTrace("Host info... Found `%s\'\n", host);
320: }
321: return pres;
322: }
323: }
324: }
325: }
326: return NULL;
2.1 frystyk 327: }
328:
329: /*
2.8 frystyk 330: ** Get and set the hostname of the remote host
331: */
332: PUBLIC char * HTHost_name (HTHost * host)
333: {
334: return host ? host->hostname : NULL;
335: }
336:
337: /*
2.1 frystyk 338: ** Get and set the type class of the remote host
339: */
340: PUBLIC char * HTHost_class (HTHost * host)
341: {
342: return host ? host->type : NULL;
343: }
344:
345: PUBLIC void HTHost_setClass (HTHost * host, char * s_class)
346: {
347: if (host && s_class) StrAllocCopy(host->type, s_class);
348: }
349:
350: /*
351: ** Get and set the version of the remote host
352: */
353: PUBLIC int HTHost_version (HTHost *host)
354: {
355: return host ? host->version : 0;
356: }
357:
358: PUBLIC void HTHost_setVersion (HTHost * host, int version)
359: {
360: if (host) host->version = version;
361: }
362:
363: /*
364: ** Get and set the cache timeout for persistent entries.
365: ** The default value is TCP_TIMEOUT
366: */
367: PUBLIC void HTHost_setPersistTimeout (time_t timeout)
368: {
369: TCPTimeout = timeout;
370: }
371:
372: PUBLIC time_t HTHost_persistTimeout (time_t timeout)
373: {
374: return TCPTimeout;
375: }
376:
377: /* Persistent Connection Expiration
378: ** --------------------------------
379: ** Should normally not be used. If, then use calendar time.
380: */
381: PUBLIC void HTHost_setPersistExpires (HTHost * host, time_t expires)
382: {
383: if (host) host->expires = expires;
384: }
385:
386: PUBLIC time_t HTHost_persistExpires (HTHost * host)
387: {
388: return host ? host->expires : -1;
389: }
390:
391: /*
2.6 frystyk 392: ** Public methods for this host
393: */
394: PUBLIC HTMethod HTHost_publicMethods (HTHost * me)
395: {
396: return me ? me->methods : METHOD_INVALID;
397: }
398:
399: PUBLIC void HTHost_setPublicMethods (HTHost * me, HTMethod methodset)
400: {
401: if (me) me->methods = methodset;
402: }
403:
404: PUBLIC void HTHost_appendPublicMethods (HTHost * me, HTMethod methodset)
405: {
406: if (me) me->methods |= methodset;
407: }
408:
409: /*
410: ** Get and set the server name of the remote host
411: */
412: PUBLIC char * HTHost_server (HTHost * host)
413: {
414: return host ? host->server : NULL;
415: }
416:
417: PUBLIC BOOL HTHost_setServer (HTHost * host, const char * server)
418: {
419: if (host && server) {
420: StrAllocCopy(host->server, server);
421: return YES;
422: }
423: return NO;
424: }
425:
426: /*
427: ** Get and set the userAgent name of the remote host
428: */
429: PUBLIC char * HTHost_userAgent (HTHost * host)
430: {
431: return host ? host->user_agent : NULL;
432: }
433:
434: PUBLIC BOOL HTHost_setUserAgent (HTHost * host, const char * userAgent)
435: {
436: if (host && userAgent) {
437: StrAllocCopy(host->user_agent, userAgent);
438: return YES;
2.12 frystyk 439: }
440: return NO;
441: }
442:
443: /*
444: ** Get and set acceptable range units
445: */
446: PUBLIC char * HTHost_rangeUnits (HTHost * host)
447: {
448: return host ? host->range_units : NULL;
449: }
450:
451: PUBLIC BOOL HTHost_setRangeUnits (HTHost * host, const char * units)
452: {
453: if (host && units) {
454: StrAllocCopy(host->range_units, units);
455: return YES;
456: }
457: return NO;
458: }
459:
460: /*
461: ** Checks whether a specific range unit is OK. We always say
462: ** YES except if we have a specific statement from the server that
463: ** it doesn't understand byte ranges - that is - it has sent "none"
464: ** in a "Accept-Range" response header
465: */
466: PUBLIC BOOL HTHost_isRangeUnitAcceptable (HTHost * host, const char * unit)
467: {
468: if (host && unit) {
469: #if 0
470: if (host->range_units) {
471: char * start = strcasestr(host->range_units, "none");
472:
473: /*
474: ** Check that "none" is infact a token. It could be part of some
475: ** other valid string, so we'd better check for it.
476: */
477: if (start) {
478:
479:
480: }
481: return NO;
482: }
483: #endif
484: return strcasecomp(unit, "bytes") ? NO : YES;
2.6 frystyk 485: }
486: return NO;
487: }
488:
2.1 frystyk 489: /* HTHost_catchClose
490: ** -----------------
491: ** This function is registered when the socket is idle so that we get
492: ** a notification if the socket closes at the other end. At this point
493: ** we can't use the request object as it might have been freed a long
494: ** time ago.
495: */
2.12.2.1! eric 496: PUBLIC int HTHost_catchClose (SOCKET soc, void * context, HTEvent_type type)
2.1 frystyk 497: {
2.12.2.1! eric 498: HTNet * net = (HTNet *)context;
! 499: HTHost * host = net->host;
2.2 frystyk 500: if (CORE_TRACE)
2.12.2.1! eric 501: HTTrace("Catch Close. called with socket %d with type %x\n",
! 502: soc, type);
! 503: if (type == HTEvent_READ) {
2.1 frystyk 504: HTChannel * ch = HTChannel_find(soc); /* Find associated channel */
2.8 frystyk 505: HTHost * host = HTChannel_host(ch); /* and associated host */
2.1 frystyk 506: if (ch && host) {
2.2 frystyk 507: if (CORE_TRACE) HTTrace("Catch Close. CLOSING socket %d\n", soc);
2.8 frystyk 508: HTHost_clearChannel(host, HT_OK);
2.1 frystyk 509: } else {
2.2 frystyk 510: if (CORE_TRACE) HTTrace("Catch Close. socket %d NOT FOUND!\n",soc);
2.1 frystyk 511: }
512: }
2.12.2.1! eric 513: HTHost_unregister(host, net, HTEvent_CLOSE);
2.1 frystyk 514: return HT_OK;
515: }
516:
517: /*
518: ** As soon as we know that this host accepts persistent connections,
519: ** we associated the channel with the host.
520: ** We don't want more than MaxSockets-2 connections to be persistent in
521: ** order to avoid deadlock.
522: */
2.12.2.1! eric 523: PUBLIC BOOL HTHost_setPersistent (HTHost * host,
! 524: BOOL persistent,
! 525: HTTransportMode mode)
2.1 frystyk 526: {
2.12.2.1! eric 527: if (!host) return NO;
! 528:
! 529: if (!persistent) {
! 530: /*
! 531: ** We use the HT_IGNORE status code as we don't want to free
! 532: ** the stream at this point in time. The situation we want to
! 533: ** avoid is that we free the channel from within the stream pipe.
! 534: ** This will lead to an infinite look having the stream freing
! 535: ** itself.
! 536: */
! 537: return HTHost_clearChannel(host, HT_IGNORE);
! 538: }
! 539:
! 540: if (host->persistent) {
2.2 frystyk 541: if (CORE_TRACE) HTTrace("Host info... %p already persistent\n", host);
542: return YES;
2.12.2.1! eric 543: }
! 544:
! 545: {
! 546: SOCKET sockfd = HTChannel_socket(host->channel);
2.8 frystyk 547: if (sockfd != INVSOC && HTNet_availablePersistentSockets() > 0) {
2.12.2.1! eric 548: host->persistent = YES;
2.8 frystyk 549: host->mode = mode;
2.1 frystyk 550: host->expires = time(NULL) + TCPTimeout; /* Default timeout */
2.12.2.1! eric 551: HTChannel_setHost(host->channel, host);
2.8 frystyk 552: HTNet_increasePersistentSocket();
2.2 frystyk 553: if (CORE_TRACE)
2.1 frystyk 554: HTTrace("Host info... added host %p as persistent\n", host);
555: return YES;
556: } else {
2.2 frystyk 557: if (CORE_TRACE)
558: HTTrace("Host info... no room for persistent socket %d\n",
2.7 frystyk 559: sockfd);
2.1 frystyk 560: }
561: }
562: return NO;
563: }
564:
565: /*
2.12.2.1! eric 566: ** Check whether we have a persistent channel or not
! 567: */
! 568: PUBLIC BOOL HTHost_isPersistent (HTHost * host)
! 569: {
! 570: return host && host->persistent;
! 571: }
! 572:
! 573: /*
2.1 frystyk 574: ** Find persistent channel associated with this host.
575: */
576: PUBLIC HTChannel * HTHost_channel (HTHost * host)
577: {
578: return host ? host->channel : NULL;
579: }
580:
581: /*
582: ** Clear the persistent entry by deleting the channel object. Note that
583: ** the channel object is only deleted if it's not used anymore.
584: */
2.8 frystyk 585: PUBLIC BOOL HTHost_clearChannel (HTHost * host, int status)
2.1 frystyk 586: {
587: if (host && host->channel) {
2.8 frystyk 588: HTChannel_setHost(host->channel, NULL);
2.10 frystyk 589:
590: /*
591: ** We don't want to recursively delete ourselves so if we are
592: ** called from within the stream pipe then don't delete the channel
593: ** at this point
594: */
2.8 frystyk 595: HTChannel_delete(host->channel, status);
2.1 frystyk 596: host->expires = 0;
597: host->channel = NULL;
2.8 frystyk 598: HTNet_decreasePersistentSocket();
2.2 frystyk 599: if (CORE_TRACE)
600: HTTrace("Host info... removed host %p as persistent\n", host);
2.1 frystyk 601: return YES;
602: }
603: return NO;
604: }
605:
606: /*
2.8 frystyk 607: ** Handle the connection mode. The mode may change mode in the
608: ** middle of a connection.
609: */
610: PUBLIC HTTransportMode HTHost_mode (HTHost * host, BOOL * active)
611: {
612: return host ? host->mode : HT_TP_SINGLE;
613: }
614:
615: /*
616: ** If the new mode is lower than the old mode then adjust the pipeline
617: ** accordingly. That is, if we are going into single mode then move
618: ** all entries in the pipeline and move the rest to the pending
619: ** queue. They will get launched at a later point in time.
620: */
621: PUBLIC BOOL HTHost_setMode (HTHost * host, HTTransportMode mode)
622: {
623: if (host) {
624: /*
625: ** Check the new mode and see if we must adjust the queues.
626: */
627: if (mode == HT_TP_SINGLE && host->mode > mode) {
628: int piped = HTList_count(host->pipeline);
629: if (piped > 0) {
630: int cnt;
631: if (CORE_TRACE)
632: HTTrace("Host info... Moving %d Net objects from pipe line to pending queue\n", piped);
633: if (!host->pending) host->pending = HTList_new();
634: for (cnt=0; cnt<piped; cnt++) {
635: HTNet * net = HTList_removeFirstObject(host->pipeline);
636: HTList_appendObject(host->pending, net);
637: }
638: }
639: }
640: host->mode = mode;
641: return YES;
642: }
643: return NO;
644: }
645:
646: /*
647: ** Check whether a host is idle meaning if it is ready for a new
648: ** request which depends on the mode of the host. If the host is
649: ** idle, i.e. ready for use then return YES else NO. If the host supports
650: ** persistent connections then still only return idle if no requests are
651: ** ongoing.
652: */
653: PUBLIC BOOL HTHost_isIdle (HTHost * host)
654: {
655: return (host && HTList_count(host->pipeline) <= 0);
656: }
657:
2.12.2.1! eric 658: PRIVATE BOOL _roomInPipe (HTHost * host)
! 659: {
! 660: int count;
! 661: if (!host) return NO;
! 662: count = HTList_count(host->pipeline);
! 663: if (host->version == HTTP_11)
! 664: return (count < MAX_PIPES);
! 665: return (count <= 0);
! 666: }
! 667:
2.8 frystyk 668: /*
669: ** Add a net object to the host object. If the host
670: ** is idle then add to active list (pipeline) else add
671: ** it to the pending list
672: ** Return HT_PENDING if we must pend, HT_OK, or HT_ERROR
673: */
674: PUBLIC int HTHost_addNet (HTHost * host, HTNet * net)
675: {
676: if (host && net) {
677: int status = HT_OK;
678:
679: /* Check to see if we can get a socket */
680: if (HTNet_availableSockets() <= 0) {
681: if (!PendHost) PendHost = HTList_new();
682: if (CORE_TRACE)
683: HTTrace("Host info... Add Host %p as pending\n", host);
684: HTList_addObject(PendHost, host);
685: status = HT_PENDING;
686: }
687:
688: /* Add to either active or pending queue */
2.12.2.1! eric 689: if (_roomInPipe(host)) {
2.8 frystyk 690: if (CORE_TRACE) HTTrace("Host info... Add Net %p to pipeline of host %p\n", net, host);
691: if (!host->pipeline) host->pipeline = HTList_new();
692: HTList_addObject(host->pipeline, net);
693:
694: /*
695: ** We have been idle and must hence unregister our catch close
696: ** event handler
697: */
698: if (host->channel) {
2.12.2.1! eric 699: HTHost_unregister(host, net, HTEvent_CLOSE);
2.8 frystyk 700: }
2.12.2.1! eric 701: /*
! 702: ** Send out the request if we're not blocked on write
! 703: */
! 704: if (!(host->registeredFor & HTEvent_BITS(HTEvent_WRITE)))
! 705: status = HTHost_launchPending(host) == TRUE ? HT_OK : HT_ERROR;
2.8 frystyk 706: } else {
707: if (CORE_TRACE) HTTrace("Host info... Add Net %p as pending\n", net);
708: if (!host->pending) host->pending = HTList_new();
709: HTList_addObject(host->pending, net);
710: status = HT_PENDING;
711: }
712: return status;
713: }
714: return HT_ERROR;
715: }
716:
2.12.2.1! eric 717: PUBLIC BOOL HTHost_free (HTHost * host, int status)
! 718: {
! 719: if (host->channel == NULL) return NO;
! 720: if (host->persistent) {
! 721: if (CORE_TRACE)
! 722: HTTrace("Host Object. keeping socket %d\n", HTChannel_socket(host->channel));
! 723: HTChannel_delete(host->channel, status);
! 724: } else {
! 725: if (CORE_TRACE)
! 726: HTTrace("Host Object. closing socket %d\n", HTChannel_socket(host->channel));
! 727:
! 728: /*
! 729: ** By lowering the semaphore we make sure that the channel
! 730: ** is gonna be deleted
! 731: */
! 732: HTChannel_downSemaphore(host->channel);
! 733: HTChannel_delete(host->channel, status);
! 734: host->channel = NULL;
! 735: }
! 736: return YES;
! 737: }
! 738:
2.8 frystyk 739: PUBLIC BOOL HTHost_deleteNet (HTHost * host, HTNet * net)
740: {
741: if (host && net) {
742: if (CORE_TRACE)
743: HTTrace("Host info... Remove Net %p from pipe line\n", net);
744: HTList_removeObject(host->pipeline, net);
745: HTList_removeObject(host->pending, net);
746: return YES;
747: }
748: return NO;
749: }
750:
751: /*
752: ** Handle pending host objects.
753: ** There are two ways we can end up with pending reqyests:
754: ** 1) If we are out of sockets then register new host objects as pending.
755: ** 2) If we are pending on a connection then register new net objects as
756: ** pending
757: ** This set of functions handles pending host objects and can start new
758: ** requests as resources get available
759: */
760:
761: /*
762: ** Check this host object for any pending requests and return the next
763: ** registered Net object.
764: */
765: PUBLIC HTNet * HTHost_nextPendingNet (HTHost * host)
766: {
767: HTNet * net = NULL;
768: if (host && host->pending && host->pipeline) {
2.11 kahan 769: /*JK 23/Sep/96 Bug correction. Associated the following lines to the
770: **above if. There was a missing pair of brackets.
771: */
772: if ((net = (HTNet *) HTList_removeFirstObject(host->pending)) != NULL) {
773: if (PROT_TRACE)
774: HTTrace("Host info... Popping %p from pending net queue\n",
775: net);
2.8 frystyk 776: HTList_addObject(host->pipeline, net);
2.11 kahan 777: }
2.8 frystyk 778: }
779: return net;
780: }
781:
782: /*
2.12.2.1! eric 783: ** Return the current list of pending host objects waiting for a socket
2.8 frystyk 784: */
785: PUBLIC HTHost * HTHost_nextPendingHost (void)
786: {
787: HTHost * host = NULL;
788: if (PendHost) {
789: if ((host = (HTHost *) HTList_removeFirstObject(PendHost)) != NULL)
790: if (PROT_TRACE)
791: HTTrace("Host info... Poping %p from pending host queue\n",
792: host);
793: }
794: return host;
795: }
796:
797: /*
798: ** Start the next pending request if any. First we look for pending
799: ** requests for the same host and then we check for any other pending
800: ** hosts
801: */
802: PUBLIC BOOL HTHost_launchPending (HTHost * host)
803: {
804: int available = HTNet_availableSockets();
805:
806: if (!host) {
807: if (PROT_TRACE) HTTrace("Host info... Bad arguments\n");
808: return NO;
809: }
810:
811: /*
812: ** Check if we do have resources available for a new request
813: ** This can either be reusing an existing connection or opening a new one
814: */
815: if (available > 0 || host->mode >= HT_TP_PIPELINE) {
2.12.2.1! eric 816: HTNet * last = (HTNet *) HTList_lastObject(host->pipeline);
2.8 frystyk 817:
818: /*
2.12.2.1! eric 819: ** Can only have one doing writing at a time
! 820: */
! 821: if (last && last->registeredFor == HTEvent_WRITE)
! 822: return NO;
! 823:
! 824: /*
! 825: ** Check the current Host object for pending Net objects
2.8 frystyk 826: */
827: if (host) {
828: HTNet * net = HTHost_nextPendingNet(host);
829: if (net) return HTNet_start(net);
830: }
831:
832: /*
833: ** Check for other pending Host objects
834: */
835: {
836: HTHost * pending = HTHost_nextPendingHost();
837: if (pending) {
838: HTNet * net = HTHost_nextPendingNet(pending);
839: if (net) return HTNet_start(net);
840: }
841: }
842:
2.12.2.1! eric 843: #if 0
2.8 frystyk 844: /*
845: ** If nothing pending then register our catch close event handler to
846: ** have something catching the socket if the remote server closes the
847: ** connection, for example due to timeout.
848: */
849: if (PROT_TRACE) HTTrace("Host info... Nothing pending\n");
850: if (host->channel) {
2.12.2.1! eric 851: host->events[HTEvent_INDEX(HTEvent_CLOSE)].cbf = HTHost_catchClose;
! 852: HTHost_register(host, NULL, HTEvent_CLOSE);
2.8 frystyk 853: }
2.12.2.1! eric 854: #endif
2.8 frystyk 855: } else
2.12.2.1! eric 856: if (PROT_TRACE) HTTrace("Host info... No more requests.\n");
2.8 frystyk 857: return NO;
2.1 frystyk 858: }
2.11 kahan 859:
2.12.2.1! eric 860: PUBLIC HTNet * HTHost_firstNet (HTHost * host)
! 861: {
! 862: return (HTNet *) HTList_firstObject(host->pipeline);
! 863: }
! 864:
! 865: /*
! 866: ** The host event manager keeps track of the state of it's client engines
! 867: ** (typically HTTPEvent), accepting multiple blocks on read or write from
! 868: ** multiple pipelined engines. It then registers its own engine
! 869: ** (HostEvent) with the event manager.
! 870: */
! 871: PUBLIC int HTHost_connect (HTHost * host, HTNet * net, char * url, int port)
! 872: {
! 873: int status;
! 874: if (host && host->connecttime)
! 875: return HT_OK;
! 876: status = HTDoConnect(net, url, port);
! 877: if (status == HT_OK)
! 878: return HT_OK;
! 879: if (status == HT_WOULD_BLOCK || status == HT_PENDING)
! 880: return HT_WOULD_BLOCK;
! 881: return HT_ERROR; /* @@@ - some more deletion and stuff here? */
! 882: }
! 883:
! 884: /*
! 885: ** Rules: SINGLE: one element in pipe, either reading or writing
! 886: ** PIPE: n element in pipe, n-1 reading, 1 writing
! 887: */
! 888: PUBLIC int HTHost_register (HTHost * host, HTNet * net, HTEvent_type type)
! 889: {
! 890: /* net object may already be registered */
! 891: if (HTEvent_BITS(type) & net->registeredFor)
! 892: return NO;
! 893: net->registeredFor ^= HTEvent_BITS(type);
! 894:
! 895: /* host object may already be registered */
! 896: if (host->registeredFor & HTEvent_BITS(type))
! 897: return YES;
! 898: host->registeredFor ^= HTEvent_BITS(type);
! 899:
! 900: return HTEvent_register(HTChannel_socket(host->channel), type, host->events+HTEvent_INDEX(type));
! 901: }
! 902:
! 903: PUBLIC int HTHost_unregister (HTHost * host, HTNet * net, HTEvent_type type)
! 904: {
! 905: /* net object may no be registered */
! 906: if (!(HTEvent_BITS(type) & net->registeredFor))
! 907: return NO;
! 908: net->registeredFor ^= HTEvent_BITS(type);
! 909:
! 910: /* host object may no be registered */
! 911: if (!(host->registeredFor & HTEvent_BITS(type)))
! 912: return YES;
! 913: host->registeredFor ^= HTEvent_BITS(type);
2.11 kahan 914:
2.12.2.1! eric 915: /* stay registered for READ to catch a socket close */
! 916: /* WRITE and CONNECT can be unregistered, though */
! 917: if ((type == HTEvent_WRITE && isLastInPipe(host, net)) ||
! 918: type == HTEvent_CONNECT)
! 919: /* if we are blocked downstream, shut down the whole pipe */
! 920: HTEvent_unregister(HTChannel_socket(host->channel), type);
! 921: return YES;
! 922: }
2.11 kahan 923:
2.12.2.1! eric 924: /*
! 925: ** The reader tells HostEvent that it's stream did not finish the data
! 926: */
! 927: PUBLIC BOOL HTHost_setRemainingRead (HTHost * host, size_t remaining)
! 928: {
! 929: if (host == NULL) return NO;
! 930: host->remainingRead = remaining;
! 931: return YES;
! 932: #if 0
! 933: /* This (old) way is recursive and needs to go to the NEXT net object */
! 934: HTNet * targetNet = (HTNet *)HTList_firstObject(host->pipeline);
! 935: if (targetNet == NULL)
! 936: return HT_ERROR;
! 937: return (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, type);
! 938: #endif
! 939: }
2.11 kahan 940:
2.12.2.1! eric 941: PUBLIC SockA * HTHost_getSockAddr (HTHost * host)
! 942: {
! 943: if (!host) return NULL;
! 944: return &host->sock_addr;
! 945: }
! 946:
! 947: PUBLIC BOOL HTHost_setHome (HTHost * host, int home)
! 948: {
! 949: if (!host) return NO;
! 950: host->home = home;
! 951: return YES;
! 952: }
! 953:
! 954: PUBLIC int HTHost_home (HTHost * host)
! 955: {
! 956: if (!host) return 0;
! 957: return host->home;
! 958: }
! 959:
! 960: #if 0 /* Is a macro right now */
! 961: PUBLIC BOOL HTHost_setDNS5 (HTHost * host, HTdns * dns)
! 962: {
! 963: if (!host) return NO;
! 964: host->dns = dns;
! 965: return YES;
! 966: }
! 967: #endif
! 968:
! 969: PUBLIC BOOL HTHost_setChannel (HTHost * host, HTChannel * channel)
! 970: {
! 971: if (!host) return NO;
! 972: host->channel = channel;
! 973: return YES;
! 974: }
! 975:
! 976: PUBLIC HTNet * HTHost_getReadNet(HTHost * host)
! 977: {
! 978: if (!host) return NULL;
! 979: return (HTNet *)HTList_firstObject(host->pipeline);
! 980: }
! 981:
! 982: /*
! 983: ** Create the input stream and bind it to the channel
! 984: ** Please read the description in the HTIOStream module for the parameters
! 985: */
! 986: PUBLIC HTInputStream * HTHost_getInput (HTHost * host, HTTransport * transport,
! 987: void * param, int mode)
! 988: {
! 989: if (host && host->channel && transport) {
! 990: HTTransport * tp = transport;
! 991: HTChannel * ch = host->channel;
! 992: HTInputStream * input = (*tp->input_new)(host, ch, param, mode);
! 993: HTChannel_setInput(ch, input);
! 994: return input;
! 995: }
! 996: if (CORE_TRACE) HTTrace("Host Object.. Can't create input stream\n");
! 997: return NULL;
! 998: }
! 999:
! 1000: PUBLIC int HTHost_read(HTHost * host)
! 1001: {
! 1002: HTInputStream * input = HTChannel_input(host->channel);
! 1003: if (input == NULL) return HT_ERROR;
! 1004: return (*input->isa->read)(input);
! 1005: }
! 1006:
! 1007: PUBLIC BOOL HTHost_setConsumed(HTHost * host, size_t bytes)
! 1008: {
! 1009: HTInputStream * input;
! 1010: if (!host || !host->channel) return NO;
! 1011: if ((input = HTChannel_input(host->channel)) == NULL)
! 1012: return NO;
! 1013: return (*input->isa->consumed)(input, bytes);
! 1014: }
2.1 frystyk 1015:
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