Annotation of libwww/Library/src/HTHost.c, revision 2.12.2.7
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.
2.12.2.7! frystyk 6: ** @(#) $Id: HTHost.c,v 2.12.2.6 1996/11/06 15:27:23 eric 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"
2.12.2.2 frystyk 18: #include "WWWMux.h"
2.1 frystyk 19: #include "HTParse.h"
20: #include "HTAlert.h"
21: #include "HTError.h"
22: #include "HTNetMan.h"
23: #include "HTTrans.h"
2.12.2.1 eric 24: #include "HTDNS.h"
25: #include "HTTPUtil.h"
26: #include "HTTCP.h"
27: #include "HTWatch.h"
2.12.2.7! frystyk 28: #include "HTHost.h" /* Implemented here */
! 29: #include "HTHstMan.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 */
2.12.2.1 eric 33: #define MAX_PIPES 5 /* maximum number of pipelined requests */
2.1 frystyk 34:
2.12.2.1 eric 35: struct _HTInputStream {
36: const HTInputStreamClass * isa;
2.1 frystyk 37: };
38:
2.12.2.3 eric 39: PRIVATE int HostEvent(SOCKET soc, void * pVoid, HTEventType type);
2.12.2.1 eric 40:
41: /* Type definitions and global variables etc. local to this module */
2.1 frystyk 42: PRIVATE time_t HostTimeout = HOST_TIMEOUT; /* Timeout on host entries */
43: PRIVATE time_t TCPTimeout = TCP_TIMEOUT; /* Timeout on persistent channels */
44:
2.8 frystyk 45: PRIVATE HTList ** HostTable = NULL;
46: PRIVATE HTList * PendHost = NULL; /* List of pending host elements */
2.1 frystyk 47:
48: /* ------------------------------------------------------------------------- */
49:
50: PRIVATE void free_object (HTHost * me)
51: {
52: if (me) {
53: HT_FREE(me->hostname);
54: HT_FREE(me->type);
2.12 frystyk 55: HT_FREE(me->server);
56: HT_FREE(me->user_agent);
57: HT_FREE(me->range_units);
2.3 eric 58: if (me->channel) {
2.5 eric 59: HTChannel_delete(me->channel, HT_OK);
2.3 eric 60: me->channel = NULL;
61: }
2.8 frystyk 62: HTList_delete(me->pipeline);
63: HTList_delete(me->pending);
2.1 frystyk 64: HT_FREE(me);
65: }
66: }
67:
68: PRIVATE BOOL delete_object (HTList * list, HTHost * me)
69: {
2.2 frystyk 70: if (CORE_TRACE) HTTrace("Host info... object %p from list %p\n", me, list);
2.1 frystyk 71: HTList_removeObject(list, (void *) me);
72: free_object(me);
73: return YES;
74: }
75:
2.12.2.1 eric 76: PRIVATE BOOL isLastInPipe (HTHost * host, HTNet * net)
77: {
78: return HTList_lastObject(host->pipeline) == net;
79: }
80:
81: /*
82: ** HostEvent - host event manager - recieves events from the event
83: ** manager and dispatches them to the client net objects by calling the
84: ** net object's cbf.
85: **
86: */
2.12.2.3 eric 87: PRIVATE int HostEvent (SOCKET soc, void * pVoid, HTEventType type)
2.12.2.1 eric 88: {
89: HTHost * host = (HTHost *)pVoid;
90:
91: if (type == HTEvent_READ) {
92: HTNet * targetNet;
93:
94: /* call the first net object */
95: do {
96: int ret;
97: targetNet = (HTNet *)HTList_firstObject(host->pipeline);
98: if (targetNet) {
99: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: READ passed to %s.\n"),
100: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
101: if ((ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel),
102: targetNet->event.param, type)) != HT_OK)
103: return ret;
104: }
105: /* call pipelined net object to eat all the data in the channel */
106: } while (host->remainingRead > 0);
107:
108: /* last target net should have set remainingRead to 0 */
109: if (targetNet)
110: return HT_OK;
111:
112: /* If there was notargetNet, it should be a close */
113: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: host %s closed connection.\n"),
114: host->hostname);
115:
116: /* Is there garbage in the channel? Let's check: */
117: {
118: char buf[256];
119: int ret;
120: while ((ret = NETREAD(HTChannel_socket(host->channel), buf, sizeof(buf))) > 0)
121: HTWATCH(HTWatch_TCP, host, HTHIDE("Host %s had %d extraneous bytes.\n"));
122: }
123: HTHost_clearChannel(host, HT_OK);
124: return HT_OK; /* extra garbage does not constitute an application error */
125:
126: } else if (type == HTEvent_WRITE) {
127: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
128: if (targetNet) {
129: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: WRITE passed to %s.\n"),
130: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
131: return (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, type);
132: }
133: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: Who wants to write to %s?\n"),
134: host->hostname);
135: return HT_ERROR;
136: }
137:
138: HTWATCH(HTWatch_TCP, host, HTHIDE("Don't know how to handle OOB data from %s?\n"),
139: host->hostname);
140: return HT_OK;
141: }
142:
2.1 frystyk 143: /*
144: ** Search the host info cache for a host object or create a new one
145: ** and add it. Examples of host names are
146: **
147: ** www.w3.org
148: ** www.foo.com:8000
149: ** 18.52.0.18
150: **
151: ** Returns Host object or NULL if error. You may get back an already
152: ** existing host object - you're not guaranteed a new one each time.
153: */
2.12.2.1 eric 154:
2.1 frystyk 155: PUBLIC HTHost * HTHost_new (char * host)
156: {
157: HTList * list = NULL; /* Current list in cache */
158: HTHost * pres = NULL;
2.12.2.7! frystyk 159: int hash = 0;
2.1 frystyk 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: char *ptr;
168: for (ptr=host; *ptr; ptr++)
2.12.2.7! frystyk 169: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.1 frystyk 170: if (!HostTable) {
2.12.2.7! frystyk 171: if ((HostTable = (HTList **) HT_CALLOC(HOST_HASH_SIZE,
2.1 frystyk 172: sizeof(HTList *))) == NULL)
173: HT_OUTOFMEM("HTHost_find");
174: }
175: if (!HostTable[hash]) HostTable[hash] = HTList_new();
176: list = HostTable[hash];
177: }
178:
179: /* Search the cache */
180: {
181: HTList * cur = list;
182: while ((pres = (HTHost *) HTList_nextObject(cur))) {
183: if (!strcmp(pres->hostname, host)) {
2.8 frystyk 184: if (HTHost_isIdle(pres) && time(NULL)>pres->ntime+HostTimeout){
2.2 frystyk 185: if (CORE_TRACE)
2.1 frystyk 186: HTTrace("Host info... Collecting host info %p\n",pres);
187: delete_object(list, pres);
188: pres = NULL;
189: }
190: break;
191: }
192: }
193: }
194:
2.8 frystyk 195: /* If not found then create new Host object, else use existing one */
2.1 frystyk 196: if (pres) {
197: if (pres->channel) {
2.12.2.6 eric 198: if (pres->expires && pres->expires < time(NULL)) { /* Cached channel is cold */
2.2 frystyk 199: if (CORE_TRACE)
2.1 frystyk 200: HTTrace("Host info... Persistent channel %p gotten cold\n",
201: pres->channel);
2.5 eric 202: HTChannel_delete(pres->channel, HT_OK);
2.1 frystyk 203: pres->channel = NULL;
204: } else {
2.2 frystyk 205: if (CORE_TRACE)
2.1 frystyk 206: HTTrace("Host info... REUSING CHANNEL %p\n",pres->channel);
207: }
208: }
209: } else {
2.12.2.1 eric 210: /* temporary event structure to COPY into host structure */
2.12.2.5 frystyk 211: HTEvent newEvent = {HT_PRIORITY_MAX, HostEvent, NULL, NULL};
2.1 frystyk 212: if ((pres = (HTHost *) HT_CALLOC(1, sizeof(HTHost))) == NULL)
213: HT_OUTOFMEM("HTHost_add");
2.12.2.5 frystyk 214: newEvent.param = pres;
2.12.2.7! frystyk 215: pres->hash = hash;
2.1 frystyk 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: pres->events[HTEvent_INDEX(HTEvent_READ)] = newEvent;
220: pres->events[HTEvent_INDEX(HTEvent_WRITE)] = newEvent;
2.2 frystyk 221: if (CORE_TRACE)
2.1 frystyk 222: HTTrace("Host info... added `%s\' to list %p\n", host, list);
223: HTList_addObject(list, (void *) pres);
224: }
225: return pres;
2.9 frystyk 226: }
227:
2.12.2.1 eric 228: PUBLIC HTHost * HTHost_newWParse (HTRequest * request, char * url, u_short default_port)
229: {
230: char * port;
231: char * fullhost = NULL;
232: char * parsedHost = NULL;
233: SockA * sin;
234: HTHost * me;
235: char * proxy = HTRequest_proxy(request);
236:
237: fullhost = HTParse(proxy ? proxy : url, "", PARSE_HOST);
238:
239: /* If there's an @ then use the stuff after it as a hostname */
240: if (fullhost) {
241: char * at_sign;
242: if ((at_sign = strchr(fullhost, '@')) != NULL)
243: parsedHost = at_sign+1;
244: else
245: parsedHost = fullhost;
246: }
247: if (!parsedHost || !*parsedHost) {
248: HTRequest_addError(request, ERR_FATAL, NO, HTERR_NO_HOST,
249: NULL, 0, "HTDoConnect");
250: HT_FREE(fullhost);
251: return NULL;
252: }
253: port = strchr(parsedHost, ':');
254: if (PROT_TRACE)
255: HTTrace("HTDoConnect. Looking up `%s\'\n", parsedHost);
256: if (port) {
257: *port++ = '\0';
258: if (!*port || !isdigit(*port))
259: port = 0;
260: }
261: /* Find information about this host */
262: if ((me = HTHost_new(parsedHost)) == NULL) {
263: if (PROT_TRACE)HTTrace("HTDoConnect. Can't get host info\n");
264: me->tcpstate = TCP_ERROR;
265: return NULL;
266: }
267: HT_FREE(fullhost); /* parsedHost points into fullhost */
268: sin = &me->sock_addr;
269: memset((void *) sin, '\0', sizeof(SockA));
270:
271: #ifdef DECNET
272: sin->sdn_family = AF_DECnet;
273: net->sock_addr.sdn_objnum = port ? (unsigned char)(strtol(port, (char **) 0, 10)) : DNP_OBJ;
274: #else /* Internet */
275: sin->sin_family = AF_INET;
276: sin->sin_port = htons(port ? atol(port) : default_port);
277: #endif
278: return me;
279: }
280:
2.9 frystyk 281: /*
282: ** Search the host info cache for a host object. Examples of host names:
283: **
284: ** www.w3.org
285: ** www.foo.com:8000
286: ** 18.52.0.18
287: **
288: ** Returns Host object or NULL if not found.
289: */
290: PUBLIC HTHost * HTHost_find (char * host)
291: {
292: HTList * list = NULL; /* Current list in cache */
293: HTHost * pres = NULL;
294: if (CORE_TRACE)
295: HTTrace("Host info... Looking for `%s\'\n", host ? host : "<null>");
296:
297: /* Find a hash for this host */
298: if (host && HostTable) {
299: int hash = 0;
300: char *ptr;
301: for (ptr=host; *ptr; ptr++)
2.12.2.7! frystyk 302: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.9 frystyk 303: if (!HostTable[hash]) return NULL;
304: list = HostTable[hash];
305:
306: /* Search the cache */
307: {
308: HTList * cur = list;
309: while ((pres = (HTHost *) HTList_nextObject(cur))) {
310: if (!strcmp(pres->hostname, host)) {
311: if (time(NULL) > pres->ntime + HostTimeout) {
312: if (CORE_TRACE)
313: HTTrace("Host info... Collecting host %p\n", pres);
314: delete_object(list, pres);
315: pres = NULL;
316: } else {
317: if (CORE_TRACE)
318: HTTrace("Host info... Found `%s\'\n", host);
319: }
320: return pres;
321: }
322: }
323: }
324: }
325: return NULL;
2.1 frystyk 326: }
327:
328: /*
2.8 frystyk 329: ** Get and set the hostname of the remote host
330: */
331: PUBLIC char * HTHost_name (HTHost * host)
332: {
333: return host ? host->hostname : NULL;
334: }
335:
336: /*
2.1 frystyk 337: ** Get and set the type class of the remote host
338: */
339: PUBLIC char * HTHost_class (HTHost * host)
340: {
341: return host ? host->type : NULL;
342: }
343:
344: PUBLIC void HTHost_setClass (HTHost * host, char * s_class)
345: {
346: if (host && s_class) StrAllocCopy(host->type, s_class);
347: }
348:
349: /*
350: ** Get and set the version of the remote host
351: */
352: PUBLIC int HTHost_version (HTHost *host)
353: {
354: return host ? host->version : 0;
355: }
356:
357: PUBLIC void HTHost_setVersion (HTHost * host, int version)
358: {
359: if (host) host->version = version;
360: }
361:
362: /*
363: ** Get and set the cache timeout for persistent entries.
364: ** The default value is TCP_TIMEOUT
365: */
366: PUBLIC void HTHost_setPersistTimeout (time_t timeout)
367: {
368: TCPTimeout = timeout;
369: }
370:
371: PUBLIC time_t HTHost_persistTimeout (time_t timeout)
372: {
373: return TCPTimeout;
374: }
375:
376: /* Persistent Connection Expiration
377: ** --------------------------------
378: ** Should normally not be used. If, then use calendar time.
379: */
380: PUBLIC void HTHost_setPersistExpires (HTHost * host, time_t expires)
381: {
382: if (host) host->expires = expires;
383: }
384:
385: PUBLIC time_t HTHost_persistExpires (HTHost * host)
386: {
387: return host ? host->expires : -1;
388: }
389:
390: /*
2.6 frystyk 391: ** Public methods for this host
392: */
393: PUBLIC HTMethod HTHost_publicMethods (HTHost * me)
394: {
395: return me ? me->methods : METHOD_INVALID;
396: }
397:
398: PUBLIC void HTHost_setPublicMethods (HTHost * me, HTMethod methodset)
399: {
400: if (me) me->methods = methodset;
401: }
402:
403: PUBLIC void HTHost_appendPublicMethods (HTHost * me, HTMethod methodset)
404: {
405: if (me) me->methods |= methodset;
406: }
407:
408: /*
409: ** Get and set the server name of the remote host
410: */
411: PUBLIC char * HTHost_server (HTHost * host)
412: {
413: return host ? host->server : NULL;
414: }
415:
416: PUBLIC BOOL HTHost_setServer (HTHost * host, const char * server)
417: {
418: if (host && server) {
419: StrAllocCopy(host->server, server);
420: return YES;
421: }
422: return NO;
423: }
424:
425: /*
426: ** Get and set the userAgent name of the remote host
427: */
428: PUBLIC char * HTHost_userAgent (HTHost * host)
429: {
430: return host ? host->user_agent : NULL;
431: }
432:
433: PUBLIC BOOL HTHost_setUserAgent (HTHost * host, const char * userAgent)
434: {
435: if (host && userAgent) {
436: StrAllocCopy(host->user_agent, userAgent);
437: return YES;
2.12 frystyk 438: }
439: return NO;
440: }
441:
442: /*
443: ** Get and set acceptable range units
444: */
445: PUBLIC char * HTHost_rangeUnits (HTHost * host)
446: {
447: return host ? host->range_units : NULL;
448: }
449:
450: PUBLIC BOOL HTHost_setRangeUnits (HTHost * host, const char * units)
451: {
452: if (host && units) {
453: StrAllocCopy(host->range_units, units);
454: return YES;
455: }
456: return NO;
457: }
458:
459: /*
460: ** Checks whether a specific range unit is OK. We always say
461: ** YES except if we have a specific statement from the server that
462: ** it doesn't understand byte ranges - that is - it has sent "none"
463: ** in a "Accept-Range" response header
464: */
465: PUBLIC BOOL HTHost_isRangeUnitAcceptable (HTHost * host, const char * unit)
466: {
467: if (host && unit) {
468: #if 0
469: if (host->range_units) {
470: char * start = strcasestr(host->range_units, "none");
471:
472: /*
473: ** Check that "none" is infact a token. It could be part of some
474: ** other valid string, so we'd better check for it.
475: */
476: if (start) {
477:
478:
479: }
480: return NO;
481: }
482: #endif
483: return strcasecomp(unit, "bytes") ? NO : YES;
2.6 frystyk 484: }
485: return NO;
486: }
487:
2.1 frystyk 488: /* HTHost_catchClose
489: ** -----------------
490: ** This function is registered when the socket is idle so that we get
491: ** a notification if the socket closes at the other end. At this point
492: ** we can't use the request object as it might have been freed a long
493: ** time ago.
494: */
2.12.2.3 eric 495: PUBLIC int HTHost_catchClose (SOCKET soc, void * context, HTEventType type)
2.1 frystyk 496: {
2.12.2.1 eric 497: HTNet * net = (HTNet *)context;
498: HTHost * host = net->host;
2.2 frystyk 499: if (CORE_TRACE)
2.12.2.1 eric 500: HTTrace("Catch Close. called with socket %d with type %x\n",
501: soc, type);
502: if (type == HTEvent_READ) {
2.1 frystyk 503: HTChannel * ch = HTChannel_find(soc); /* Find associated channel */
2.8 frystyk 504: HTHost * host = HTChannel_host(ch); /* and associated host */
2.1 frystyk 505: if (ch && host) {
2.2 frystyk 506: if (CORE_TRACE) HTTrace("Catch Close. CLOSING socket %d\n", soc);
2.8 frystyk 507: HTHost_clearChannel(host, HT_OK);
2.1 frystyk 508: } else {
2.2 frystyk 509: if (CORE_TRACE) HTTrace("Catch Close. socket %d NOT FOUND!\n",soc);
2.1 frystyk 510: }
511: }
2.12.2.1 eric 512: HTHost_unregister(host, net, HTEvent_CLOSE);
2.1 frystyk 513: return HT_OK;
514: }
515:
516: /*
517: ** As soon as we know that this host accepts persistent connections,
518: ** we associated the channel with the host.
519: ** We don't want more than MaxSockets-2 connections to be persistent in
520: ** order to avoid deadlock.
521: */
2.12.2.1 eric 522: PUBLIC BOOL HTHost_setPersistent (HTHost * host,
523: BOOL persistent,
524: HTTransportMode mode)
2.1 frystyk 525: {
2.12.2.1 eric 526: if (!host) return NO;
527:
528: if (!persistent) {
529: /*
530: ** We use the HT_IGNORE status code as we don't want to free
531: ** the stream at this point in time. The situation we want to
532: ** avoid is that we free the channel from within the stream pipe.
533: ** This will lead to an infinite look having the stream freing
534: ** itself.
535: */
536: return HTHost_clearChannel(host, HT_IGNORE);
537: }
538:
539: if (host->persistent) {
2.2 frystyk 540: if (CORE_TRACE) HTTrace("Host info... %p already persistent\n", host);
541: return YES;
2.12.2.1 eric 542: }
543:
544: {
545: SOCKET sockfd = HTChannel_socket(host->channel);
2.8 frystyk 546: if (sockfd != INVSOC && HTNet_availablePersistentSockets() > 0) {
2.12.2.1 eric 547: host->persistent = YES;
2.12.2.7! frystyk 548: HTHost_setMode(host, mode);
2.1 frystyk 549: host->expires = time(NULL) + TCPTimeout; /* Default timeout */
2.12.2.1 eric 550: HTChannel_setHost(host->channel, host);
2.8 frystyk 551: HTNet_increasePersistentSocket();
2.2 frystyk 552: if (CORE_TRACE)
2.1 frystyk 553: HTTrace("Host info... added host %p as persistent\n", host);
554: return YES;
555: } else {
2.2 frystyk 556: if (CORE_TRACE)
557: HTTrace("Host info... no room for persistent socket %d\n",
2.7 frystyk 558: sockfd);
2.1 frystyk 559: }
560: }
561: return NO;
562: }
563:
564: /*
2.12.2.1 eric 565: ** Check whether we have a persistent channel or not
566: */
567: PUBLIC BOOL HTHost_isPersistent (HTHost * host)
568: {
569: return host && host->persistent;
570: }
571:
572: /*
2.1 frystyk 573: ** Find persistent channel associated with this host.
574: */
575: PUBLIC HTChannel * HTHost_channel (HTHost * host)
576: {
577: return host ? host->channel : NULL;
578: }
579:
580: /*
581: ** Clear the persistent entry by deleting the channel object. Note that
582: ** the channel object is only deleted if it's not used anymore.
583: */
2.8 frystyk 584: PUBLIC BOOL HTHost_clearChannel (HTHost * host, int status)
2.1 frystyk 585: {
586: if (host && host->channel) {
2.8 frystyk 587: HTChannel_setHost(host->channel, NULL);
2.10 frystyk 588:
2.12.2.6 eric 589: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
590: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
591:
2.10 frystyk 592: /*
593: ** We don't want to recursively delete ourselves so if we are
594: ** called from within the stream pipe then don't delete the channel
595: ** at this point
596: */
2.8 frystyk 597: HTChannel_delete(host->channel, status);
2.1 frystyk 598: host->expires = 0;
599: host->channel = NULL;
2.8 frystyk 600: HTNet_decreasePersistentSocket();
2.2 frystyk 601: if (CORE_TRACE)
602: HTTrace("Host info... removed host %p as persistent\n", host);
2.1 frystyk 603: return YES;
604: }
605: return NO;
606: }
607:
608: /*
2.8 frystyk 609: ** Handle the connection mode. The mode may change mode in the
610: ** middle of a connection.
611: */
612: PUBLIC HTTransportMode HTHost_mode (HTHost * host, BOOL * active)
613: {
614: return host ? host->mode : HT_TP_SINGLE;
615: }
616:
617: /*
618: ** If the new mode is lower than the old mode then adjust the pipeline
619: ** accordingly. That is, if we are going into single mode then move
620: ** all entries in the pipeline and move the rest to the pending
621: ** queue. They will get launched at a later point in time.
622: */
623: PUBLIC BOOL HTHost_setMode (HTHost * host, HTTransportMode mode)
624: {
625: if (host) {
626: /*
627: ** Check the new mode and see if we must adjust the queues.
628: */
629: if (mode == HT_TP_SINGLE && host->mode > mode) {
630: int piped = HTList_count(host->pipeline);
631: if (piped > 0) {
632: int cnt;
633: if (CORE_TRACE)
634: HTTrace("Host info... Moving %d Net objects from pipe line to pending queue\n", piped);
635: if (!host->pending) host->pending = HTList_new();
636: for (cnt=0; cnt<piped; cnt++) {
637: HTNet * net = HTList_removeFirstObject(host->pipeline);
638: HTList_appendObject(host->pending, net);
639: }
640: }
641: }
2.12.2.7! frystyk 642: if (PROT_TRACE)
! 643: HTTrace("Host info... New mode is %d for host %p\n", host->mode, host);
2.8 frystyk 644: host->mode = mode;
645: return YES;
646: }
647: return NO;
648: }
649:
650: /*
651: ** Check whether a host is idle meaning if it is ready for a new
652: ** request which depends on the mode of the host. If the host is
653: ** idle, i.e. ready for use then return YES else NO. If the host supports
654: ** persistent connections then still only return idle if no requests are
655: ** ongoing.
656: */
657: PUBLIC BOOL HTHost_isIdle (HTHost * host)
658: {
659: return (host && HTList_count(host->pipeline) <= 0);
660: }
661:
2.12.2.1 eric 662: PRIVATE BOOL _roomInPipe (HTHost * host)
663: {
664: int count;
665: if (!host) return NO;
666: count = HTList_count(host->pipeline);
2.12.2.7! frystyk 667: return host->mode == HT_TP_INTERLEAVE ? YES :
! 668: (host->version == HTTP_11) ? (count < MAX_PIPES) : (count <= 0);
2.12.2.1 eric 669: }
670:
2.8 frystyk 671: /*
672: ** Add a net object to the host object. If the host
673: ** is idle then add to active list (pipeline) else add
674: ** it to the pending list
675: ** Return HT_PENDING if we must pend, HT_OK, or HT_ERROR
676: */
677: PUBLIC int HTHost_addNet (HTHost * host, HTNet * net)
678: {
679: if (host && net) {
680: int status = HT_OK;
681:
682: /* Check to see if we can get a socket */
683: if (HTNet_availableSockets() <= 0) {
684: if (!PendHost) PendHost = HTList_new();
685: if (CORE_TRACE)
686: HTTrace("Host info... Add Host %p as pending\n", host);
687: HTList_addObject(PendHost, host);
688: status = HT_PENDING;
689: }
690:
691: /* Add to either active or pending queue */
2.12.2.1 eric 692: if (_roomInPipe(host)) {
2.8 frystyk 693: if (CORE_TRACE) HTTrace("Host info... Add Net %p to pipeline of host %p\n", net, host);
694: if (!host->pipeline) host->pipeline = HTList_new();
695: HTList_addObject(host->pipeline, net);
696:
697: /*
698: ** We have been idle and must hence unregister our catch close
699: ** event handler
700: */
701: if (host->channel) {
2.12.2.1 eric 702: HTHost_unregister(host, net, HTEvent_CLOSE);
2.8 frystyk 703: }
2.12.2.1 eric 704: /*
705: ** Send out the request if we're not blocked on write
706: */
707: if (!(host->registeredFor & HTEvent_BITS(HTEvent_WRITE)))
708: status = HTHost_launchPending(host) == TRUE ? HT_OK : HT_ERROR;
2.8 frystyk 709: } else {
710: if (CORE_TRACE) HTTrace("Host info... Add Net %p as pending\n", net);
711: if (!host->pending) host->pending = HTList_new();
712: HTList_addObject(host->pending, net);
713: status = HT_PENDING;
714: }
715: return status;
716: }
717: return HT_ERROR;
718: }
719:
2.12.2.1 eric 720: PUBLIC BOOL HTHost_free (HTHost * host, int status)
721: {
722: if (host->channel == NULL) return NO;
723: if (host->persistent) {
724: if (CORE_TRACE)
725: HTTrace("Host Object. keeping socket %d\n", HTChannel_socket(host->channel));
726: HTChannel_delete(host->channel, status);
727: } else {
728: if (CORE_TRACE)
729: HTTrace("Host Object. closing socket %d\n", HTChannel_socket(host->channel));
730:
731: /*
732: ** By lowering the semaphore we make sure that the channel
733: ** is gonna be deleted
734: */
2.12.2.3 eric 735: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
736: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
737: host->registeredFor = 0;
2.12.2.1 eric 738: HTChannel_downSemaphore(host->channel);
739: HTChannel_delete(host->channel, status);
740: host->channel = NULL;
741: }
742: return YES;
743: }
744:
2.8 frystyk 745: PUBLIC BOOL HTHost_deleteNet (HTHost * host, HTNet * net)
746: {
747: if (host && net) {
748: if (CORE_TRACE)
749: HTTrace("Host info... Remove Net %p from pipe line\n", net);
750: HTList_removeObject(host->pipeline, net);
751: HTList_removeObject(host->pending, net);
752: return YES;
753: }
754: return NO;
755: }
756:
757: /*
758: ** Handle pending host objects.
759: ** There are two ways we can end up with pending reqyests:
760: ** 1) If we are out of sockets then register new host objects as pending.
761: ** 2) If we are pending on a connection then register new net objects as
762: ** pending
763: ** This set of functions handles pending host objects and can start new
764: ** requests as resources get available
765: */
766:
767: /*
768: ** Check this host object for any pending requests and return the next
769: ** registered Net object.
770: */
771: PUBLIC HTNet * HTHost_nextPendingNet (HTHost * host)
772: {
773: HTNet * net = NULL;
774: if (host && host->pending && host->pipeline) {
2.11 kahan 775: /*JK 23/Sep/96 Bug correction. Associated the following lines to the
776: **above if. There was a missing pair of brackets.
777: */
778: if ((net = (HTNet *) HTList_removeFirstObject(host->pending)) != NULL) {
779: if (PROT_TRACE)
780: HTTrace("Host info... Popping %p from pending net queue\n",
781: net);
2.8 frystyk 782: HTList_addObject(host->pipeline, net);
2.11 kahan 783: }
2.8 frystyk 784: }
785: return net;
786: }
787:
788: /*
2.12.2.1 eric 789: ** Return the current list of pending host objects waiting for a socket
2.8 frystyk 790: */
791: PUBLIC HTHost * HTHost_nextPendingHost (void)
792: {
793: HTHost * host = NULL;
794: if (PendHost) {
795: if ((host = (HTHost *) HTList_removeFirstObject(PendHost)) != NULL)
796: if (PROT_TRACE)
797: HTTrace("Host info... Poping %p from pending host queue\n",
798: host);
799: }
800: return host;
801: }
802:
803: /*
804: ** Start the next pending request if any. First we look for pending
805: ** requests for the same host and then we check for any other pending
806: ** hosts
807: */
808: PUBLIC BOOL HTHost_launchPending (HTHost * host)
809: {
810: int available = HTNet_availableSockets();
811:
812: if (!host) {
813: if (PROT_TRACE) HTTrace("Host info... Bad arguments\n");
814: return NO;
815: }
816:
817: /*
818: ** Check if we do have resources available for a new request
819: ** This can either be reusing an existing connection or opening a new one
820: */
821: if (available > 0 || host->mode >= HT_TP_PIPELINE) {
822:
823: /*
2.12.2.7! frystyk 824: ** In pipeline we can only have one doing writing at a time.
! 825: ** We therefore check that there are no other Net object
! 826: ** registered for write
2.12.2.1 eric 827: */
2.12.2.7! frystyk 828: if (host->mode == HT_TP_PIPELINE) {
! 829: HTNet * last = (HTNet *) HTList_lastObject(host->pipeline);
! 830: if (last && last->registeredFor == HTEvent_WRITE)
! 831: return NO;
! 832: }
2.12.2.1 eric 833:
834: /*
835: ** Check the current Host object for pending Net objects
2.8 frystyk 836: */
837: if (host) {
838: HTNet * net = HTHost_nextPendingNet(host);
839: if (net) return HTNet_start(net);
840: }
841:
842: /*
843: ** Check for other pending Host objects
844: */
845: {
846: HTHost * pending = HTHost_nextPendingHost();
847: if (pending) {
848: HTNet * net = HTHost_nextPendingNet(pending);
849: if (net) return HTNet_start(net);
850: }
851: }
852: } else
2.12.2.1 eric 853: if (PROT_TRACE) HTTrace("Host info... No more requests.\n");
2.8 frystyk 854: return NO;
2.1 frystyk 855: }
2.11 kahan 856:
2.12.2.1 eric 857: PUBLIC HTNet * HTHost_firstNet (HTHost * host)
858: {
859: return (HTNet *) HTList_firstObject(host->pipeline);
860: }
861:
862: /*
863: ** The host event manager keeps track of the state of it's client engines
864: ** (typically HTTPEvent), accepting multiple blocks on read or write from
865: ** multiple pipelined engines. It then registers its own engine
866: ** (HostEvent) with the event manager.
867: */
2.12.2.4 frystyk 868: PUBLIC int HTHost_connect (HTHost * host, HTNet * net, char * url, HTProtocolId port)
2.12.2.1 eric 869: {
870: int status;
871: if (host && host->connecttime)
872: return HT_OK;
873: status = HTDoConnect(net, url, port);
874: if (status == HT_OK)
875: return HT_OK;
876: if (status == HT_WOULD_BLOCK || status == HT_PENDING)
877: return HT_WOULD_BLOCK;
878: return HT_ERROR; /* @@@ - some more deletion and stuff here? */
879: }
880:
881: /*
882: ** Rules: SINGLE: one element in pipe, either reading or writing
883: ** PIPE: n element in pipe, n-1 reading, 1 writing
884: */
2.12.2.3 eric 885: PUBLIC int HTHost_register (HTHost * host, HTNet * net, HTEventType type)
2.12.2.1 eric 886: {
2.12.2.7! frystyk 887: if (host && net) {
2.12.2.1 eric 888:
2.12.2.7! frystyk 889: /* net object may already be registered */
! 890: if (HTEvent_BITS(type) & net->registeredFor)
! 891: return NO;
! 892: net->registeredFor ^= HTEvent_BITS(type);
2.12.2.1 eric 893:
2.12.2.7! frystyk 894: /* host object may already be registered */
! 895: if (host->registeredFor & HTEvent_BITS(type))
! 896: return YES;
! 897: host->registeredFor ^= HTEvent_BITS(type);
! 898: return HTEvent_register(HTChannel_socket(host->channel), type, host->events+HTEvent_INDEX(type));
! 899: }
! 900: return NO;
2.12.2.1 eric 901: }
902:
2.12.2.3 eric 903: PUBLIC int HTHost_unregister (HTHost * host, HTNet * net, HTEventType type)
2.12.2.1 eric 904: {
2.12.2.7! frystyk 905: if (host && net) {
2.12.2.1 eric 906:
2.12.2.7! frystyk 907: /* net object may no be registered */
! 908: if (!(HTEvent_BITS(type) & net->registeredFor))
! 909: return NO;
! 910: net->registeredFor ^= HTEvent_BITS(type);
2.11 kahan 911:
2.12.2.7! frystyk 912: /* host object may no be registered */
! 913: if (!(host->registeredFor & HTEvent_BITS(type)))
! 914: return YES;
! 915: host->registeredFor ^= HTEvent_BITS(type);
! 916:
! 917: /* stay registered for READ to catch a socket close */
! 918: /* WRITE and CONNECT can be unregistered, though */
! 919: if ((type == HTEvent_WRITE && isLastInPipe(host, net)) ||
! 920: type == HTEvent_CONNECT)
! 921: /* if we are blocked downstream, shut down the whole pipe */
! 922: HTEvent_unregister(HTChannel_socket(host->channel), type);
! 923: return YES;
! 924: }
! 925: return NO;
2.12.2.1 eric 926: }
2.11 kahan 927:
2.12.2.1 eric 928: /*
929: ** The reader tells HostEvent that it's stream did not finish the data
930: */
931: PUBLIC BOOL HTHost_setRemainingRead (HTHost * host, size_t remaining)
932: {
933: if (host == NULL) return NO;
934: host->remainingRead = remaining;
935: return YES;
936: }
2.11 kahan 937:
2.12.2.1 eric 938: PUBLIC SockA * HTHost_getSockAddr (HTHost * host)
939: {
940: if (!host) return NULL;
941: return &host->sock_addr;
942: }
943:
944: PUBLIC BOOL HTHost_setHome (HTHost * host, int home)
945: {
946: if (!host) return NO;
947: host->home = home;
948: return YES;
949: }
950:
951: PUBLIC int HTHost_home (HTHost * host)
952: {
953: if (!host) return 0;
954: return host->home;
955: }
956:
957: #if 0 /* Is a macro right now */
958: PUBLIC BOOL HTHost_setDNS5 (HTHost * host, HTdns * dns)
959: {
960: if (!host) return NO;
961: host->dns = dns;
962: return YES;
963: }
964: #endif
965:
966: PUBLIC BOOL HTHost_setChannel (HTHost * host, HTChannel * channel)
967: {
968: if (!host) return NO;
969: host->channel = channel;
970: return YES;
971: }
972:
973: PUBLIC HTNet * HTHost_getReadNet(HTHost * host)
974: {
2.12.2.2 frystyk 975: if (host) {
2.12.2.7! frystyk 976: if (host->mode == HT_TP_INTERLEAVE) {
! 977: HTMuxChannel * muxch = HTMuxChannel_find(host);
! 978: return HTMuxChannel_net(muxch);
! 979: }
! 980: return (HTNet *) HTList_firstObject(host->pipeline);
2.12.2.2 frystyk 981: }
982: return NULL;
983: }
984:
985: PUBLIC HTNet * HTHost_getWriteNet(HTHost * host)
986: {
987: return host ? (HTNet *) HTList_lastObject(host->pipeline) : NULL;
2.12.2.1 eric 988: }
989:
990: /*
991: ** Create the input stream and bind it to the channel
992: ** Please read the description in the HTIOStream module for the parameters
993: */
2.12.2.2 frystyk 994: PUBLIC HTInputStream * HTHost_getInput (HTHost * host, HTTransport * tp,
995: void * param, int mode)
2.12.2.1 eric 996: {
2.12.2.2 frystyk 997: if (host && host->channel && tp) {
2.12.2.1 eric 998: HTChannel * ch = host->channel;
999: HTInputStream * input = (*tp->input_new)(host, ch, param, mode);
1000: HTChannel_setInput(ch, input);
1001: return input;
1002: }
1003: if (CORE_TRACE) HTTrace("Host Object.. Can't create input stream\n");
2.12.2.2 frystyk 1004: return NULL;
1005: }
1006:
1007: PUBLIC HTOutputStream * HTHost_getOutput (HTHost * host, HTTransport * tp,
1008: void * param, int mode)
1009: {
1010: if (host && host->channel && tp) {
1011: HTChannel * ch = host->channel;
1012: HTOutputStream * output = (*tp->output_new)(host, ch, param, mode);
1013: HTChannel_setOutput(ch, output);
1014: return output;
1015: }
1016: if (CORE_TRACE) HTTrace("Host Object.. Can't create output stream\n");
1017: return NULL;
1018: }
1019:
1020: PUBLIC HTOutputStream * HTHost_output (HTHost * host, HTNet * net)
1021: {
1022: if (host && host->channel && net) {
1023: HTOutputStream * output = HTChannel_output(host->channel);
1024:
1025: /*
1026: ** If we are in MUX mode then create new output stream on top
1027: ** of the already existing one. Otherwise just return what we
1028: ** have.
1029: */
1030: if (host->mode == HT_TP_INTERLEAVE) {
2.12.2.4 frystyk 1031: HTStream * target = (HTStream *) HTChannel_output(host->channel);
1032: output = HTMuxWriter_new(host, net, target);
2.12.2.2 frystyk 1033: }
1034: return output;
1035: }
2.12.2.1 eric 1036: return NULL;
1037: }
1038:
1039: PUBLIC int HTHost_read(HTHost * host)
1040: {
1041: HTInputStream * input = HTChannel_input(host->channel);
1042: if (input == NULL) return HT_ERROR;
1043: return (*input->isa->read)(input);
1044: }
1045:
1046: PUBLIC BOOL HTHost_setConsumed(HTHost * host, size_t bytes)
1047: {
1048: HTInputStream * input;
1049: if (!host || !host->channel) return NO;
1050: if ((input = HTChannel_input(host->channel)) == NULL)
1051: return NO;
1052: return (*input->isa->consumed)(input, bytes);
1053: }
2.1 frystyk 1054:
2.12.2.7! frystyk 1055: PUBLIC int HTHost_hash (HTHost * host)
! 1056: {
! 1057: return host ? host->hash : -1;
! 1058: }
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