Annotation of libwww/Library/src/HTHost.c, revision 2.12.2.10
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.
2.12.2.10! frystyk 6: ** @(#) $Id: HTHost.c,v 2.12.2.9 1996/11/08 22:06:56 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: }
2.12.2.10! frystyk 62: HTEvent_delete(me->events[0]);
! 63: HTEvent_delete(me->events[1]);
2.8 frystyk 64: HTList_delete(me->pipeline);
65: HTList_delete(me->pending);
2.1 frystyk 66: HT_FREE(me);
67: }
68: }
69:
70: PRIVATE BOOL delete_object (HTList * list, HTHost * me)
71: {
2.2 frystyk 72: if (CORE_TRACE) HTTrace("Host info... object %p from list %p\n", me, list);
2.1 frystyk 73: HTList_removeObject(list, (void *) me);
74: free_object(me);
75: return YES;
76: }
77:
2.12.2.1 eric 78: PRIVATE BOOL isLastInPipe (HTHost * host, HTNet * net)
79: {
80: return HTList_lastObject(host->pipeline) == net;
81: }
82:
83: /*
84: ** HostEvent - host event manager - recieves events from the event
85: ** manager and dispatches them to the client net objects by calling the
86: ** net object's cbf.
87: **
88: */
2.12.2.3 eric 89: PRIVATE int HostEvent (SOCKET soc, void * pVoid, HTEventType type)
2.12.2.1 eric 90: {
91: HTHost * host = (HTHost *)pVoid;
92:
93: if (type == HTEvent_READ) {
94: HTNet * targetNet;
95:
96: /* call the first net object */
97: do {
98: int ret;
99: targetNet = (HTNet *)HTList_firstObject(host->pipeline);
100: if (targetNet) {
2.12.2.8 eric 101: if (CORE_TRACE)
102: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: READ passed to %s.\n"),
103: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
2.12.2.1 eric 104: if ((ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel),
105: targetNet->event.param, type)) != HT_OK)
106: return ret;
107: }
108: /* call pipelined net object to eat all the data in the channel */
109: } while (host->remainingRead > 0);
110:
111: /* last target net should have set remainingRead to 0 */
112: if (targetNet)
113: return HT_OK;
114:
115: /* If there was notargetNet, it should be a close */
116: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: host %s closed connection.\n"),
117: host->hostname);
118:
119: /* Is there garbage in the channel? Let's check: */
120: {
121: char buf[256];
122: int ret;
123: while ((ret = NETREAD(HTChannel_socket(host->channel), buf, sizeof(buf))) > 0)
124: HTWATCH(HTWatch_TCP, host, HTHIDE("Host %s had %d extraneous bytes.\n"));
125: }
126: HTHost_clearChannel(host, HT_OK);
127: return HT_OK; /* extra garbage does not constitute an application error */
128:
129: } else if (type == HTEvent_WRITE) {
130: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
131: if (targetNet) {
2.12.2.8 eric 132: if (CORE_TRACE)
133: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: WRITE passed to %s.\n"),
134: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
2.12.2.1 eric 135: return (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, type);
136: }
137: HTWATCH(HTWatch_TCP, host, HTHIDE("HostEvent: Who wants to write to %s?\n"),
138: host->hostname);
139: return HT_ERROR;
140: }
141:
142: HTWATCH(HTWatch_TCP, host, HTHIDE("Don't know how to handle OOB data from %s?\n"),
143: host->hostname);
144: return HT_OK;
145: }
146:
2.1 frystyk 147: /*
148: ** Search the host info cache for a host object or create a new one
149: ** and add it. Examples of host names are
150: **
151: ** www.w3.org
152: ** www.foo.com:8000
153: ** 18.52.0.18
154: **
155: ** Returns Host object or NULL if error. You may get back an already
156: ** existing host object - you're not guaranteed a new one each time.
157: */
2.12.2.1 eric 158:
2.1 frystyk 159: PUBLIC HTHost * HTHost_new (char * host)
160: {
161: HTList * list = NULL; /* Current list in cache */
162: HTHost * pres = NULL;
2.12.2.7 frystyk 163: int hash = 0;
2.1 frystyk 164: if (!host) {
2.2 frystyk 165: if (CORE_TRACE) HTTrace("Host info... Bad argument\n");
2.1 frystyk 166: return NULL;
167: }
168:
169: /* Find a hash for this host */
170: {
171: char *ptr;
172: for (ptr=host; *ptr; ptr++)
2.12.2.7 frystyk 173: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.1 frystyk 174: if (!HostTable) {
2.12.2.7 frystyk 175: if ((HostTable = (HTList **) HT_CALLOC(HOST_HASH_SIZE,
2.1 frystyk 176: sizeof(HTList *))) == NULL)
177: HT_OUTOFMEM("HTHost_find");
178: }
179: if (!HostTable[hash]) HostTable[hash] = HTList_new();
180: list = HostTable[hash];
181: }
182:
183: /* Search the cache */
184: {
185: HTList * cur = list;
186: while ((pres = (HTHost *) HTList_nextObject(cur))) {
187: if (!strcmp(pres->hostname, host)) {
2.8 frystyk 188: if (HTHost_isIdle(pres) && time(NULL)>pres->ntime+HostTimeout){
2.2 frystyk 189: if (CORE_TRACE)
2.1 frystyk 190: HTTrace("Host info... Collecting host info %p\n",pres);
191: delete_object(list, pres);
192: pres = NULL;
193: }
194: break;
195: }
196: }
197: }
198:
2.8 frystyk 199: /* If not found then create new Host object, else use existing one */
2.1 frystyk 200: if (pres) {
201: if (pres->channel) {
2.12.2.6 eric 202: if (pres->expires && pres->expires < time(NULL)) { /* Cached channel is cold */
2.2 frystyk 203: if (CORE_TRACE)
2.1 frystyk 204: HTTrace("Host info... Persistent channel %p gotten cold\n",
205: pres->channel);
2.5 eric 206: HTChannel_delete(pres->channel, HT_OK);
2.1 frystyk 207: pres->channel = NULL;
208: } else {
2.2 frystyk 209: if (CORE_TRACE)
2.1 frystyk 210: HTTrace("Host info... REUSING CHANNEL %p\n",pres->channel);
211: }
212: }
213: } else {
214: if ((pres = (HTHost *) HT_CALLOC(1, sizeof(HTHost))) == NULL)
215: HT_OUTOFMEM("HTHost_add");
2.12.2.7 frystyk 216: pres->hash = hash;
2.1 frystyk 217: StrAllocCopy(pres->hostname, host);
218: pres->ntime = time(NULL);
2.8 frystyk 219: pres->mode = HT_TP_SINGLE;
2.12.2.10! frystyk 220: pres->events[HTEvent_INDEX(HTEvent_READ)] = HTEvent_new(HostEvent, pres, HT_PRIORITY_MAX, -1);
! 221: pres->events[HTEvent_INDEX(HTEvent_WRITE)]= HTEvent_new(HostEvent, pres, HT_PRIORITY_MAX, -1);
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: 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
2.12.2.9 eric 278: HT_FREE(fullhost); /* parsedHost points into fullhost */
2.12.2.1 eric 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++)
2.12.2.7 frystyk 303: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.9 frystyk 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: */
2.12.2.3 eric 496: PUBLIC int HTHost_catchClose (SOCKET soc, void * context, HTEventType 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;
2.12.2.7 frystyk 549: HTHost_setMode(host, 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:
2.12.2.6 eric 590: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
591: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
592:
2.10 frystyk 593: /*
594: ** We don't want to recursively delete ourselves so if we are
595: ** called from within the stream pipe then don't delete the channel
596: ** at this point
597: */
2.8 frystyk 598: HTChannel_delete(host->channel, status);
2.1 frystyk 599: host->expires = 0;
600: host->channel = NULL;
2.8 frystyk 601: HTNet_decreasePersistentSocket();
2.2 frystyk 602: if (CORE_TRACE)
603: HTTrace("Host info... removed host %p as persistent\n", host);
2.1 frystyk 604: return YES;
605: }
606: return NO;
607: }
608:
609: /*
2.8 frystyk 610: ** Handle the connection mode. The mode may change mode in the
611: ** middle of a connection.
612: */
613: PUBLIC HTTransportMode HTHost_mode (HTHost * host, BOOL * active)
614: {
615: return host ? host->mode : HT_TP_SINGLE;
616: }
617:
618: /*
619: ** If the new mode is lower than the old mode then adjust the pipeline
620: ** accordingly. That is, if we are going into single mode then move
621: ** all entries in the pipeline and move the rest to the pending
622: ** queue. They will get launched at a later point in time.
623: */
624: PUBLIC BOOL HTHost_setMode (HTHost * host, HTTransportMode mode)
625: {
626: if (host) {
627: /*
628: ** Check the new mode and see if we must adjust the queues.
629: */
630: if (mode == HT_TP_SINGLE && host->mode > mode) {
631: int piped = HTList_count(host->pipeline);
632: if (piped > 0) {
633: int cnt;
634: if (CORE_TRACE)
635: HTTrace("Host info... Moving %d Net objects from pipe line to pending queue\n", piped);
636: if (!host->pending) host->pending = HTList_new();
637: for (cnt=0; cnt<piped; cnt++) {
638: HTNet * net = HTList_removeFirstObject(host->pipeline);
639: HTList_appendObject(host->pending, net);
640: }
641: }
642: }
2.12.2.7 frystyk 643: if (PROT_TRACE)
644: HTTrace("Host info... New mode is %d for host %p\n", host->mode, host);
2.8 frystyk 645: host->mode = mode;
646: return YES;
647: }
648: return NO;
649: }
650:
651: /*
652: ** Check whether a host is idle meaning if it is ready for a new
653: ** request which depends on the mode of the host. If the host is
654: ** idle, i.e. ready for use then return YES else NO. If the host supports
655: ** persistent connections then still only return idle if no requests are
656: ** ongoing.
657: */
658: PUBLIC BOOL HTHost_isIdle (HTHost * host)
659: {
660: return (host && HTList_count(host->pipeline) <= 0);
661: }
662:
2.12.2.1 eric 663: PRIVATE BOOL _roomInPipe (HTHost * host)
664: {
665: int count;
666: if (!host) return NO;
667: count = HTList_count(host->pipeline);
2.12.2.7 frystyk 668: return host->mode == HT_TP_INTERLEAVE ? YES :
669: (host->version == HTTP_11) ? (count < MAX_PIPES) : (count <= 0);
2.12.2.1 eric 670: }
671:
2.8 frystyk 672: /*
673: ** Add a net object to the host object. If the host
674: ** is idle then add to active list (pipeline) else add
675: ** it to the pending list
676: ** Return HT_PENDING if we must pend, HT_OK, or HT_ERROR
677: */
678: PUBLIC int HTHost_addNet (HTHost * host, HTNet * net)
679: {
680: if (host && net) {
681: int status = HT_OK;
682:
683: /* Check to see if we can get a socket */
684: if (HTNet_availableSockets() <= 0) {
685: if (!PendHost) PendHost = HTList_new();
686: if (CORE_TRACE)
687: HTTrace("Host info... Add Host %p as pending\n", host);
688: HTList_addObject(PendHost, host);
689: status = HT_PENDING;
690: }
691:
692: /* Add to either active or pending queue */
2.12.2.1 eric 693: if (_roomInPipe(host)) {
2.8 frystyk 694: if (CORE_TRACE) HTTrace("Host info... Add Net %p to pipeline of host %p\n", net, host);
695: if (!host->pipeline) host->pipeline = HTList_new();
696: HTList_addObject(host->pipeline, net);
2.12.2.8 eric 697: #if 0
2.8 frystyk 698: /*
699: ** We have been idle and must hence unregister our catch close
700: ** event handler
701: */
702: if (host->channel) {
2.12.2.1 eric 703: HTHost_unregister(host, net, HTEvent_CLOSE);
2.8 frystyk 704: }
2.12.2.8 eric 705: #endif
2.12.2.1 eric 706: /*
707: ** Send out the request if we're not blocked on write
708: */
709: if (!(host->registeredFor & HTEvent_BITS(HTEvent_WRITE)))
710: status = HTHost_launchPending(host) == TRUE ? HT_OK : HT_ERROR;
2.8 frystyk 711: } else {
712: if (CORE_TRACE) HTTrace("Host info... Add Net %p as pending\n", net);
713: if (!host->pending) host->pending = HTList_new();
714: HTList_addObject(host->pending, net);
715: status = HT_PENDING;
716: }
717: return status;
718: }
719: return HT_ERROR;
720: }
721:
2.12.2.1 eric 722: PUBLIC BOOL HTHost_free (HTHost * host, int status)
723: {
724: if (host->channel == NULL) return NO;
725: if (host->persistent) {
726: if (CORE_TRACE)
727: HTTrace("Host Object. keeping socket %d\n", HTChannel_socket(host->channel));
728: HTChannel_delete(host->channel, status);
729: } else {
730: if (CORE_TRACE)
731: HTTrace("Host Object. closing socket %d\n", HTChannel_socket(host->channel));
732:
733: /*
734: ** By lowering the semaphore we make sure that the channel
735: ** is gonna be deleted
736: */
2.12.2.3 eric 737: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
738: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
739: host->registeredFor = 0;
2.12.2.1 eric 740: HTChannel_downSemaphore(host->channel);
741: HTChannel_delete(host->channel, status);
742: host->channel = NULL;
743: }
744: return YES;
745: }
746:
2.8 frystyk 747: PUBLIC BOOL HTHost_deleteNet (HTHost * host, HTNet * net)
748: {
749: if (host && net) {
750: if (CORE_TRACE)
751: HTTrace("Host info... Remove Net %p from pipe line\n", net);
752: HTList_removeObject(host->pipeline, net);
753: HTList_removeObject(host->pending, net);
754: return YES;
755: }
756: return NO;
757: }
758:
759: /*
760: ** Handle pending host objects.
761: ** There are two ways we can end up with pending reqyests:
762: ** 1) If we are out of sockets then register new host objects as pending.
763: ** 2) If we are pending on a connection then register new net objects as
764: ** pending
765: ** This set of functions handles pending host objects and can start new
766: ** requests as resources get available
767: */
768:
769: /*
770: ** Check this host object for any pending requests and return the next
771: ** registered Net object.
772: */
773: PUBLIC HTNet * HTHost_nextPendingNet (HTHost * host)
774: {
775: HTNet * net = NULL;
776: if (host && host->pending && host->pipeline) {
2.11 kahan 777: /*JK 23/Sep/96 Bug correction. Associated the following lines to the
778: **above if. There was a missing pair of brackets.
779: */
780: if ((net = (HTNet *) HTList_removeFirstObject(host->pending)) != NULL) {
781: if (PROT_TRACE)
782: HTTrace("Host info... Popping %p from pending net queue\n",
783: net);
2.8 frystyk 784: HTList_addObject(host->pipeline, net);
2.11 kahan 785: }
2.8 frystyk 786: }
787: return net;
788: }
789:
790: /*
2.12.2.1 eric 791: ** Return the current list of pending host objects waiting for a socket
2.8 frystyk 792: */
793: PUBLIC HTHost * HTHost_nextPendingHost (void)
794: {
795: HTHost * host = NULL;
796: if (PendHost) {
797: if ((host = (HTHost *) HTList_removeFirstObject(PendHost)) != NULL)
798: if (PROT_TRACE)
799: HTTrace("Host info... Poping %p from pending host queue\n",
800: host);
801: }
802: return host;
803: }
804:
805: /*
806: ** Start the next pending request if any. First we look for pending
807: ** requests for the same host and then we check for any other pending
808: ** hosts
809: */
810: PUBLIC BOOL HTHost_launchPending (HTHost * host)
811: {
812: int available = HTNet_availableSockets();
813:
814: if (!host) {
815: if (PROT_TRACE) HTTrace("Host info... Bad arguments\n");
816: return NO;
817: }
818:
819: /*
820: ** Check if we do have resources available for a new request
821: ** This can either be reusing an existing connection or opening a new one
822: */
823: if (available > 0 || host->mode >= HT_TP_PIPELINE) {
824:
825: /*
2.12.2.7 frystyk 826: ** In pipeline we can only have one doing writing at a time.
827: ** We therefore check that there are no other Net object
828: ** registered for write
2.12.2.1 eric 829: */
2.12.2.7 frystyk 830: if (host->mode == HT_TP_PIPELINE) {
831: HTNet * last = (HTNet *) HTList_lastObject(host->pipeline);
832: if (last && last->registeredFor == HTEvent_WRITE)
833: return NO;
834: }
2.12.2.1 eric 835:
836: /*
837: ** Check the current Host object for pending Net objects
2.8 frystyk 838: */
839: if (host) {
840: HTNet * net = HTHost_nextPendingNet(host);
2.12.2.8 eric 841: if (net) return HTNet_execute(net, HTEvent_WRITE);
2.8 frystyk 842: }
843:
844: /*
845: ** Check for other pending Host objects
846: */
847: {
848: HTHost * pending = HTHost_nextPendingHost();
849: if (pending) {
850: HTNet * net = HTHost_nextPendingNet(pending);
2.12.2.8 eric 851: if (net) return HTNet_execute(net, HTEvent_WRITE);
2.8 frystyk 852: }
853: }
854: } else
2.12.2.1 eric 855: if (PROT_TRACE) HTTrace("Host info... No more requests.\n");
2.8 frystyk 856: return NO;
2.1 frystyk 857: }
2.11 kahan 858:
2.12.2.1 eric 859: PUBLIC HTNet * HTHost_firstNet (HTHost * host)
860: {
861: return (HTNet *) HTList_firstObject(host->pipeline);
862: }
863:
864: /*
865: ** The host event manager keeps track of the state of it's client engines
866: ** (typically HTTPEvent), accepting multiple blocks on read or write from
867: ** multiple pipelined engines. It then registers its own engine
868: ** (HostEvent) with the event manager.
869: */
2.12.2.4 frystyk 870: PUBLIC int HTHost_connect (HTHost * host, HTNet * net, char * url, HTProtocolId port)
2.12.2.1 eric 871: {
872: int status;
873: if (host && host->connecttime)
874: return HT_OK;
875: status = HTDoConnect(net, url, port);
876: if (status == HT_OK)
877: return HT_OK;
878: if (status == HT_WOULD_BLOCK || status == HT_PENDING)
879: return HT_WOULD_BLOCK;
880: return HT_ERROR; /* @@@ - some more deletion and stuff here? */
881: }
882:
883: /*
884: ** Rules: SINGLE: one element in pipe, either reading or writing
885: ** PIPE: n element in pipe, n-1 reading, 1 writing
886: */
2.12.2.3 eric 887: PUBLIC int HTHost_register (HTHost * host, HTNet * net, HTEventType type)
2.12.2.1 eric 888: {
2.12.2.7 frystyk 889: if (host && net) {
2.12.2.1 eric 890:
2.12.2.7 frystyk 891: /* net object may already be registered */
892: if (HTEvent_BITS(type) & net->registeredFor)
893: return NO;
894: net->registeredFor ^= HTEvent_BITS(type);
2.12.2.1 eric 895:
2.12.2.7 frystyk 896: /* host object may already be registered */
897: if (host->registeredFor & HTEvent_BITS(type))
898: return YES;
899: host->registeredFor ^= HTEvent_BITS(type);
2.12.2.10! frystyk 900: return HTEvent_register(HTChannel_socket(host->channel), type, *(host->events+HTEvent_INDEX(type)));
2.12.2.7 frystyk 901: }
902: return NO;
2.12.2.1 eric 903: }
904:
2.12.2.3 eric 905: PUBLIC int HTHost_unregister (HTHost * host, HTNet * net, HTEventType type)
2.12.2.1 eric 906: {
2.12.2.7 frystyk 907: if (host && net) {
2.12.2.1 eric 908:
2.12.2.7 frystyk 909: /* net object may no be registered */
910: if (!(HTEvent_BITS(type) & net->registeredFor))
911: return NO;
912: net->registeredFor ^= HTEvent_BITS(type);
2.11 kahan 913:
2.12.2.7 frystyk 914: /* host object may no be registered */
915: if (!(host->registeredFor & HTEvent_BITS(type)))
916: return YES;
917: host->registeredFor ^= HTEvent_BITS(type);
918:
919: /* stay registered for READ to catch a socket close */
920: /* WRITE and CONNECT can be unregistered, though */
921: if ((type == HTEvent_WRITE && isLastInPipe(host, net)) ||
922: type == HTEvent_CONNECT)
923: /* if we are blocked downstream, shut down the whole pipe */
924: HTEvent_unregister(HTChannel_socket(host->channel), type);
925: return YES;
926: }
927: return NO;
2.12.2.1 eric 928: }
2.11 kahan 929:
2.12.2.1 eric 930: /*
931: ** The reader tells HostEvent that it's stream did not finish the data
932: */
933: PUBLIC BOOL HTHost_setRemainingRead (HTHost * host, size_t remaining)
934: {
935: if (host == NULL) return NO;
936: host->remainingRead = remaining;
937: return YES;
938: }
2.11 kahan 939:
2.12.2.1 eric 940: PUBLIC SockA * HTHost_getSockAddr (HTHost * host)
941: {
942: if (!host) return NULL;
943: return &host->sock_addr;
944: }
945:
946: PUBLIC BOOL HTHost_setHome (HTHost * host, int home)
947: {
948: if (!host) return NO;
949: host->home = home;
950: return YES;
951: }
952:
953: PUBLIC int HTHost_home (HTHost * host)
954: {
955: if (!host) return 0;
956: return host->home;
957: }
958:
959: #if 0 /* Is a macro right now */
960: PUBLIC BOOL HTHost_setDNS5 (HTHost * host, HTdns * dns)
961: {
962: if (!host) return NO;
963: host->dns = dns;
964: return YES;
965: }
966: #endif
967:
968: PUBLIC BOOL HTHost_setChannel (HTHost * host, HTChannel * channel)
969: {
970: if (!host) return NO;
971: host->channel = channel;
972: return YES;
973: }
974:
975: PUBLIC HTNet * HTHost_getReadNet(HTHost * host)
976: {
2.12.2.2 frystyk 977: if (host) {
2.12.2.7 frystyk 978: if (host->mode == HT_TP_INTERLEAVE) {
979: HTMuxChannel * muxch = HTMuxChannel_find(host);
980: return HTMuxChannel_net(muxch);
981: }
982: return (HTNet *) HTList_firstObject(host->pipeline);
2.12.2.2 frystyk 983: }
984: return NULL;
985: }
986:
987: PUBLIC HTNet * HTHost_getWriteNet(HTHost * host)
988: {
989: return host ? (HTNet *) HTList_lastObject(host->pipeline) : NULL;
2.12.2.1 eric 990: }
991:
992: /*
993: ** Create the input stream and bind it to the channel
994: ** Please read the description in the HTIOStream module for the parameters
995: */
2.12.2.2 frystyk 996: PUBLIC HTInputStream * HTHost_getInput (HTHost * host, HTTransport * tp,
997: void * param, int mode)
2.12.2.1 eric 998: {
2.12.2.2 frystyk 999: if (host && host->channel && tp) {
2.12.2.1 eric 1000: HTChannel * ch = host->channel;
1001: HTInputStream * input = (*tp->input_new)(host, ch, param, mode);
1002: HTChannel_setInput(ch, input);
1003: return input;
1004: }
1005: if (CORE_TRACE) HTTrace("Host Object.. Can't create input stream\n");
2.12.2.2 frystyk 1006: return NULL;
1007: }
1008:
1009: PUBLIC HTOutputStream * HTHost_getOutput (HTHost * host, HTTransport * tp,
1010: void * param, int mode)
1011: {
1012: if (host && host->channel && tp) {
1013: HTChannel * ch = host->channel;
1014: HTOutputStream * output = (*tp->output_new)(host, ch, param, mode);
1015: HTChannel_setOutput(ch, output);
1016: return output;
1017: }
1018: if (CORE_TRACE) HTTrace("Host Object.. Can't create output stream\n");
1019: return NULL;
1020: }
1021:
1022: PUBLIC HTOutputStream * HTHost_output (HTHost * host, HTNet * net)
1023: {
1024: if (host && host->channel && net) {
1025: HTOutputStream * output = HTChannel_output(host->channel);
1026:
1027: /*
1028: ** If we are in MUX mode then create new output stream on top
1029: ** of the already existing one. Otherwise just return what we
1030: ** have.
1031: */
1032: if (host->mode == HT_TP_INTERLEAVE) {
2.12.2.4 frystyk 1033: HTStream * target = (HTStream *) HTChannel_output(host->channel);
1034: output = HTMuxWriter_new(host, net, target);
2.12.2.2 frystyk 1035: }
1036: return output;
1037: }
2.12.2.1 eric 1038: return NULL;
1039: }
1040:
2.12.2.8 eric 1041: PUBLIC int HTHost_read(HTHost * host, HTNet * net)
2.12.2.1 eric 1042: {
1043: HTInputStream * input = HTChannel_input(host->channel);
2.12.2.8 eric 1044: if (net != HTHost_getReadNet(host)) {
1045: HTHost_register(host, net, HTEvent_READ);
1046: return HT_WOULD_BLOCK;
1047: }
2.12.2.1 eric 1048: if (input == NULL) return HT_ERROR;
1049: return (*input->isa->read)(input);
1050: }
1051:
1052: PUBLIC BOOL HTHost_setConsumed(HTHost * host, size_t bytes)
1053: {
1054: HTInputStream * input;
1055: if (!host || !host->channel) return NO;
1056: if ((input = HTChannel_input(host->channel)) == NULL)
1057: return NO;
1058: return (*input->isa->consumed)(input, bytes);
1059: }
2.1 frystyk 1060:
2.12.2.7 frystyk 1061: PUBLIC int HTHost_hash (HTHost * host)
1062: {
1063: return host ? host->hash : -1;
1064: }
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