Annotation of libwww/Library/src/HTHost.c, revision 2.12.2.14
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.
2.12.2.14! frystyk 6: ** @(#) $Id: HTHost.c,v 2.12.2.13 1996/11/26 23:22:15 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"
2.12.2.7 frystyk 27: #include "HTHost.h" /* Implemented here */
28: #include "HTHstMan.h"
2.1 frystyk 29:
30: #define HOST_TIMEOUT 43200L /* Default host timeout is 12 h */
31: #define TCP_TIMEOUT 3600L /* Default TCP timeout i 1 h */
2.12.2.1 eric 32: #define MAX_PIPES 5 /* maximum number of pipelined requests */
2.1 frystyk 33:
2.12.2.1 eric 34: struct _HTInputStream {
35: const HTInputStreamClass * isa;
2.1 frystyk 36: };
37:
2.12.2.3 eric 38: PRIVATE int HostEvent(SOCKET soc, void * pVoid, HTEventType type);
2.12.2.1 eric 39:
40: /* Type definitions and global variables etc. local to this module */
2.1 frystyk 41: PRIVATE time_t HostTimeout = HOST_TIMEOUT; /* Timeout on host entries */
42: PRIVATE time_t TCPTimeout = TCP_TIMEOUT; /* Timeout on persistent channels */
43:
2.8 frystyk 44: PRIVATE HTList ** HostTable = NULL;
45: PRIVATE HTList * PendHost = NULL; /* List of pending host elements */
2.1 frystyk 46:
2.12.2.14! frystyk 47: PRIVATE int EventTimeout = -1; /* Global Host event timeout */
! 48:
2.1 frystyk 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: }
2.12.2.10 frystyk 63: HTEvent_delete(me->events[0]);
64: HTEvent_delete(me->events[1]);
2.8 frystyk 65: HTList_delete(me->pipeline);
66: HTList_delete(me->pending);
2.1 frystyk 67: HT_FREE(me);
68: }
69: }
70:
71: PRIVATE BOOL delete_object (HTList * list, HTHost * me)
72: {
2.2 frystyk 73: if (CORE_TRACE) HTTrace("Host info... object %p from list %p\n", me, list);
2.1 frystyk 74: HTList_removeObject(list, (void *) me);
75: free_object(me);
76: return YES;
77: }
78:
2.12.2.1 eric 79: PRIVATE BOOL isLastInPipe (HTHost * host, HTNet * net)
80: {
81: return HTList_lastObject(host->pipeline) == net;
82: }
83:
84: /*
85: ** HostEvent - host event manager - recieves events from the event
86: ** manager and dispatches them to the client net objects by calling the
87: ** net object's cbf.
88: **
89: */
2.12.2.3 eric 90: PRIVATE int HostEvent (SOCKET soc, void * pVoid, HTEventType type)
2.12.2.1 eric 91: {
92: HTHost * host = (HTHost *)pVoid;
93:
94: if (type == HTEvent_READ) {
95: HTNet * targetNet;
96:
97: /* call the first net object */
98: do {
99: int ret;
100: targetNet = (HTNet *)HTList_firstObject(host->pipeline);
101: if (targetNet) {
2.12.2.8 eric 102: if (CORE_TRACE)
2.12.2.13 eric 103: HTTrace(HTHIDE("HostEvent: READ passed to %s.\n"),
2.12.2.8 eric 104: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
2.12.2.1 eric 105: if ((ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel),
106: targetNet->event.param, type)) != HT_OK)
107: return ret;
108: }
2.12.2.11 eric 109: if (targetNet == NULL && host->remainingRead > 0) {
110: HTTrace("HostEvent... Error: %d bytes left to read and nowhere to put them\n", host->remainingRead);
111: host->remainingRead = 0;
112: /*
113: ** Fall through to close the channel
114: */
115: }
2.12.2.1 eric 116: /* call pipelined net object to eat all the data in the channel */
117: } while (host->remainingRead > 0);
118:
119: /* last target net should have set remainingRead to 0 */
120: if (targetNet)
121: return HT_OK;
122:
123: /* If there was notargetNet, it should be a close */
2.12.2.13 eric 124: HTTrace(HTHIDE("HostEvent: host %s closed connection.\n"),
2.12.2.1 eric 125: host->hostname);
126:
127: /* Is there garbage in the channel? Let's check: */
128: {
129: char buf[256];
130: int ret;
131: while ((ret = NETREAD(HTChannel_socket(host->channel), buf, sizeof(buf))) > 0)
2.12.2.13 eric 132: HTTrace(HTHIDE("Host %s had %d extraneous bytes.\n"));
2.12.2.1 eric 133: }
134: HTHost_clearChannel(host, HT_OK);
135: return HT_OK; /* extra garbage does not constitute an application error */
136:
137: } else if (type == HTEvent_WRITE) {
2.12.2.11 eric 138: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
2.12.2.1 eric 139: if (targetNet) {
2.12.2.8 eric 140: if (CORE_TRACE)
2.12.2.13 eric 141: HTTrace(HTHIDE("HostEvent: WRITE passed to %s.\n"),
2.12.2.8 eric 142: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
2.12.2.1 eric 143: return (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, type);
144: }
2.12.2.13 eric 145: HTTrace(HTHIDE("HostEvent: Who wants to write to %s?\n"),
2.12.2.1 eric 146: host->hostname);
147: return HT_ERROR;
148: }
149:
2.12.2.13 eric 150: HTTrace(HTHIDE("Don't know how to handle OOB data from %s?\n"),
2.12.2.1 eric 151: host->hostname);
152: return HT_OK;
153: }
154:
2.1 frystyk 155: /*
156: ** Search the host info cache for a host object or create a new one
157: ** and add it. Examples of host names are
158: **
159: ** www.w3.org
160: ** www.foo.com:8000
161: ** 18.52.0.18
162: **
163: ** Returns Host object or NULL if error. You may get back an already
164: ** existing host object - you're not guaranteed a new one each time.
165: */
2.12.2.1 eric 166:
2.1 frystyk 167: PUBLIC HTHost * HTHost_new (char * host)
168: {
169: HTList * list = NULL; /* Current list in cache */
170: HTHost * pres = NULL;
2.12.2.7 frystyk 171: int hash = 0;
2.1 frystyk 172: if (!host) {
2.2 frystyk 173: if (CORE_TRACE) HTTrace("Host info... Bad argument\n");
2.1 frystyk 174: return NULL;
175: }
176:
177: /* Find a hash for this host */
178: {
179: char *ptr;
180: for (ptr=host; *ptr; ptr++)
2.12.2.7 frystyk 181: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.1 frystyk 182: if (!HostTable) {
2.12.2.7 frystyk 183: if ((HostTable = (HTList **) HT_CALLOC(HOST_HASH_SIZE,
2.1 frystyk 184: sizeof(HTList *))) == NULL)
185: HT_OUTOFMEM("HTHost_find");
186: }
187: if (!HostTable[hash]) HostTable[hash] = HTList_new();
188: list = HostTable[hash];
189: }
190:
191: /* Search the cache */
192: {
193: HTList * cur = list;
194: while ((pres = (HTHost *) HTList_nextObject(cur))) {
195: if (!strcmp(pres->hostname, host)) {
2.8 frystyk 196: if (HTHost_isIdle(pres) && time(NULL)>pres->ntime+HostTimeout){
2.2 frystyk 197: if (CORE_TRACE)
2.1 frystyk 198: HTTrace("Host info... Collecting host info %p\n",pres);
199: delete_object(list, pres);
200: pres = NULL;
201: }
202: break;
203: }
204: }
205: }
206:
2.8 frystyk 207: /* If not found then create new Host object, else use existing one */
2.1 frystyk 208: if (pres) {
209: if (pres->channel) {
2.12.2.6 eric 210: if (pres->expires && pres->expires < time(NULL)) { /* Cached channel is cold */
2.2 frystyk 211: if (CORE_TRACE)
2.1 frystyk 212: HTTrace("Host info... Persistent channel %p gotten cold\n",
213: pres->channel);
2.5 eric 214: HTChannel_delete(pres->channel, HT_OK);
2.1 frystyk 215: pres->channel = NULL;
216: } else {
2.2 frystyk 217: if (CORE_TRACE)
2.1 frystyk 218: HTTrace("Host info... REUSING CHANNEL %p\n",pres->channel);
219: }
220: }
221: } else {
222: if ((pres = (HTHost *) HT_CALLOC(1, sizeof(HTHost))) == NULL)
223: HT_OUTOFMEM("HTHost_add");
2.12.2.7 frystyk 224: pres->hash = hash;
2.1 frystyk 225: StrAllocCopy(pres->hostname, host);
226: pres->ntime = time(NULL);
2.8 frystyk 227: pres->mode = HT_TP_SINGLE;
2.12.2.10 frystyk 228: pres->events[HTEvent_INDEX(HTEvent_READ)] = HTEvent_new(HostEvent, pres, HT_PRIORITY_MAX, -1);
229: pres->events[HTEvent_INDEX(HTEvent_WRITE)]= HTEvent_new(HostEvent, pres, HT_PRIORITY_MAX, -1);
2.2 frystyk 230: if (CORE_TRACE)
2.1 frystyk 231: HTTrace("Host info... added `%s\' to list %p\n", host, list);
232: HTList_addObject(list, (void *) pres);
233: }
234: return pres;
2.9 frystyk 235: }
236:
2.12.2.1 eric 237: PUBLIC HTHost * HTHost_newWParse (HTRequest * request, char * url, u_short default_port)
238: {
239: char * port;
240: char * fullhost = NULL;
241: char * parsedHost = NULL;
242: SockA * sin;
243: HTHost * me;
244: char * proxy = HTRequest_proxy(request);
245:
246: fullhost = HTParse(proxy ? proxy : url, "", PARSE_HOST);
247:
248: /* If there's an @ then use the stuff after it as a hostname */
249: if (fullhost) {
250: char * at_sign;
251: if ((at_sign = strchr(fullhost, '@')) != NULL)
252: parsedHost = at_sign+1;
253: else
254: parsedHost = fullhost;
255: }
256: if (!parsedHost || !*parsedHost) {
257: HTRequest_addError(request, ERR_FATAL, NO, HTERR_NO_HOST,
258: NULL, 0, "HTDoConnect");
259: HT_FREE(fullhost);
260: return NULL;
261: }
262: port = strchr(parsedHost, ':');
263: if (PROT_TRACE)
264: HTTrace("HTDoConnect. Looking up `%s\'\n", parsedHost);
265: if (port) {
266: *port++ = '\0';
267: if (!*port || !isdigit(*port))
268: port = 0;
269: }
270: /* Find information about this host */
271: if ((me = HTHost_new(parsedHost)) == NULL) {
272: if (PROT_TRACE)HTTrace("HTDoConnect. Can't get host info\n");
273: me->tcpstate = TCP_ERROR;
274: return NULL;
275: }
276: sin = &me->sock_addr;
277: memset((void *) sin, '\0', sizeof(SockA));
278:
279: #ifdef DECNET
280: sin->sdn_family = AF_DECnet;
281: net->sock_addr.sdn_objnum = port ? (unsigned char)(strtol(port, (char **) 0, 10)) : DNP_OBJ;
282: #else /* Internet */
283: sin->sin_family = AF_INET;
284: sin->sin_port = htons(port ? atol(port) : default_port);
285: #endif
2.12.2.9 eric 286: HT_FREE(fullhost); /* parsedHost points into fullhost */
2.12.2.1 eric 287: return me;
288: }
289:
2.9 frystyk 290: /*
291: ** Search the host info cache for a host object. Examples of host names:
292: **
293: ** www.w3.org
294: ** www.foo.com:8000
295: ** 18.52.0.18
296: **
297: ** Returns Host object or NULL if not found.
298: */
299: PUBLIC HTHost * HTHost_find (char * host)
300: {
301: HTList * list = NULL; /* Current list in cache */
302: HTHost * pres = NULL;
303: if (CORE_TRACE)
304: HTTrace("Host info... Looking for `%s\'\n", host ? host : "<null>");
305:
306: /* Find a hash for this host */
307: if (host && HostTable) {
308: int hash = 0;
309: char *ptr;
310: for (ptr=host; *ptr; ptr++)
2.12.2.7 frystyk 311: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.9 frystyk 312: if (!HostTable[hash]) return NULL;
313: list = HostTable[hash];
314:
315: /* Search the cache */
316: {
317: HTList * cur = list;
318: while ((pres = (HTHost *) HTList_nextObject(cur))) {
319: if (!strcmp(pres->hostname, host)) {
320: if (time(NULL) > pres->ntime + HostTimeout) {
321: if (CORE_TRACE)
322: HTTrace("Host info... Collecting host %p\n", pres);
323: delete_object(list, pres);
324: pres = NULL;
325: } else {
326: if (CORE_TRACE)
327: HTTrace("Host info... Found `%s\'\n", host);
328: }
329: return pres;
330: }
331: }
332: }
333: }
334: return NULL;
2.1 frystyk 335: }
336:
337: /*
2.8 frystyk 338: ** Get and set the hostname of the remote host
339: */
340: PUBLIC char * HTHost_name (HTHost * host)
341: {
342: return host ? host->hostname : NULL;
343: }
344:
345: /*
2.1 frystyk 346: ** Get and set the type class of the remote host
347: */
348: PUBLIC char * HTHost_class (HTHost * host)
349: {
350: return host ? host->type : NULL;
351: }
352:
353: PUBLIC void HTHost_setClass (HTHost * host, char * s_class)
354: {
355: if (host && s_class) StrAllocCopy(host->type, s_class);
356: }
357:
358: /*
359: ** Get and set the version of the remote host
360: */
361: PUBLIC int HTHost_version (HTHost *host)
362: {
363: return host ? host->version : 0;
364: }
365:
366: PUBLIC void HTHost_setVersion (HTHost * host, int version)
367: {
368: if (host) host->version = version;
369: }
370:
371: /*
372: ** Get and set the cache timeout for persistent entries.
373: ** The default value is TCP_TIMEOUT
374: */
375: PUBLIC void HTHost_setPersistTimeout (time_t timeout)
376: {
377: TCPTimeout = timeout;
378: }
379:
380: PUBLIC time_t HTHost_persistTimeout (time_t timeout)
381: {
382: return TCPTimeout;
383: }
384:
385: /* Persistent Connection Expiration
386: ** --------------------------------
387: ** Should normally not be used. If, then use calendar time.
388: */
389: PUBLIC void HTHost_setPersistExpires (HTHost * host, time_t expires)
390: {
391: if (host) host->expires = expires;
392: }
393:
394: PUBLIC time_t HTHost_persistExpires (HTHost * host)
395: {
396: return host ? host->expires : -1;
397: }
398:
399: /*
2.6 frystyk 400: ** Public methods for this host
401: */
402: PUBLIC HTMethod HTHost_publicMethods (HTHost * me)
403: {
404: return me ? me->methods : METHOD_INVALID;
405: }
406:
407: PUBLIC void HTHost_setPublicMethods (HTHost * me, HTMethod methodset)
408: {
409: if (me) me->methods = methodset;
410: }
411:
412: PUBLIC void HTHost_appendPublicMethods (HTHost * me, HTMethod methodset)
413: {
414: if (me) me->methods |= methodset;
415: }
416:
417: /*
418: ** Get and set the server name of the remote host
419: */
420: PUBLIC char * HTHost_server (HTHost * host)
421: {
422: return host ? host->server : NULL;
423: }
424:
425: PUBLIC BOOL HTHost_setServer (HTHost * host, const char * server)
426: {
427: if (host && server) {
428: StrAllocCopy(host->server, server);
429: return YES;
430: }
431: return NO;
432: }
433:
434: /*
435: ** Get and set the userAgent name of the remote host
436: */
437: PUBLIC char * HTHost_userAgent (HTHost * host)
438: {
439: return host ? host->user_agent : NULL;
440: }
441:
442: PUBLIC BOOL HTHost_setUserAgent (HTHost * host, const char * userAgent)
443: {
444: if (host && userAgent) {
445: StrAllocCopy(host->user_agent, userAgent);
446: return YES;
2.12 frystyk 447: }
448: return NO;
449: }
450:
451: /*
452: ** Get and set acceptable range units
453: */
454: PUBLIC char * HTHost_rangeUnits (HTHost * host)
455: {
456: return host ? host->range_units : NULL;
457: }
458:
459: PUBLIC BOOL HTHost_setRangeUnits (HTHost * host, const char * units)
460: {
461: if (host && units) {
462: StrAllocCopy(host->range_units, units);
463: return YES;
464: }
465: return NO;
466: }
467:
468: /*
469: ** Checks whether a specific range unit is OK. We always say
470: ** YES except if we have a specific statement from the server that
471: ** it doesn't understand byte ranges - that is - it has sent "none"
472: ** in a "Accept-Range" response header
473: */
474: PUBLIC BOOL HTHost_isRangeUnitAcceptable (HTHost * host, const char * unit)
475: {
476: if (host && unit) {
477: #if 0
478: if (host->range_units) {
479: char * start = strcasestr(host->range_units, "none");
480:
481: /*
482: ** Check that "none" is infact a token. It could be part of some
483: ** other valid string, so we'd better check for it.
484: */
485: if (start) {
486:
487:
488: }
489: return NO;
490: }
491: #endif
492: return strcasecomp(unit, "bytes") ? NO : YES;
2.6 frystyk 493: }
494: return NO;
495: }
496:
2.1 frystyk 497: /* HTHost_catchClose
498: ** -----------------
499: ** This function is registered when the socket is idle so that we get
500: ** a notification if the socket closes at the other end. At this point
501: ** we can't use the request object as it might have been freed a long
502: ** time ago.
503: */
2.12.2.3 eric 504: PUBLIC int HTHost_catchClose (SOCKET soc, void * context, HTEventType type)
2.1 frystyk 505: {
2.12.2.1 eric 506: HTNet * net = (HTNet *)context;
507: HTHost * host = net->host;
2.2 frystyk 508: if (CORE_TRACE)
2.12.2.1 eric 509: HTTrace("Catch Close. called with socket %d with type %x\n",
510: soc, type);
511: if (type == HTEvent_READ) {
2.1 frystyk 512: HTChannel * ch = HTChannel_find(soc); /* Find associated channel */
2.8 frystyk 513: HTHost * host = HTChannel_host(ch); /* and associated host */
2.1 frystyk 514: if (ch && host) {
2.2 frystyk 515: if (CORE_TRACE) HTTrace("Catch Close. CLOSING socket %d\n", soc);
2.8 frystyk 516: HTHost_clearChannel(host, HT_OK);
2.1 frystyk 517: } else {
2.2 frystyk 518: if (CORE_TRACE) HTTrace("Catch Close. socket %d NOT FOUND!\n",soc);
2.1 frystyk 519: }
520: }
2.12.2.1 eric 521: HTHost_unregister(host, net, HTEvent_CLOSE);
2.1 frystyk 522: return HT_OK;
523: }
524:
525: /*
526: ** As soon as we know that this host accepts persistent connections,
527: ** we associated the channel with the host.
528: ** We don't want more than MaxSockets-2 connections to be persistent in
529: ** order to avoid deadlock.
530: */
2.12.2.1 eric 531: PUBLIC BOOL HTHost_setPersistent (HTHost * host,
532: BOOL persistent,
533: HTTransportMode mode)
2.1 frystyk 534: {
2.12.2.1 eric 535: if (!host) return NO;
536:
537: if (!persistent) {
538: /*
539: ** We use the HT_IGNORE status code as we don't want to free
540: ** the stream at this point in time. The situation we want to
541: ** avoid is that we free the channel from within the stream pipe.
542: ** This will lead to an infinite look having the stream freing
543: ** itself.
544: */
545: return HTHost_clearChannel(host, HT_IGNORE);
546: }
547:
548: if (host->persistent) {
2.2 frystyk 549: if (CORE_TRACE) HTTrace("Host info... %p already persistent\n", host);
550: return YES;
2.12.2.1 eric 551: }
552:
553: {
554: SOCKET sockfd = HTChannel_socket(host->channel);
2.8 frystyk 555: if (sockfd != INVSOC && HTNet_availablePersistentSockets() > 0) {
2.12.2.1 eric 556: host->persistent = YES;
2.12.2.7 frystyk 557: HTHost_setMode(host, mode);
2.1 frystyk 558: host->expires = time(NULL) + TCPTimeout; /* Default timeout */
2.12.2.1 eric 559: HTChannel_setHost(host->channel, host);
2.8 frystyk 560: HTNet_increasePersistentSocket();
2.2 frystyk 561: if (CORE_TRACE)
2.1 frystyk 562: HTTrace("Host info... added host %p as persistent\n", host);
563: return YES;
564: } else {
2.2 frystyk 565: if (CORE_TRACE)
566: HTTrace("Host info... no room for persistent socket %d\n",
2.7 frystyk 567: sockfd);
2.1 frystyk 568: }
569: }
570: return NO;
571: }
572:
573: /*
2.12.2.1 eric 574: ** Check whether we have a persistent channel or not
575: */
576: PUBLIC BOOL HTHost_isPersistent (HTHost * host)
577: {
578: return host && host->persistent;
579: }
580:
581: /*
2.1 frystyk 582: ** Find persistent channel associated with this host.
583: */
584: PUBLIC HTChannel * HTHost_channel (HTHost * host)
585: {
586: return host ? host->channel : NULL;
587: }
588:
589: /*
590: ** Clear the persistent entry by deleting the channel object. Note that
591: ** the channel object is only deleted if it's not used anymore.
592: */
2.8 frystyk 593: PUBLIC BOOL HTHost_clearChannel (HTHost * host, int status)
2.1 frystyk 594: {
595: if (host && host->channel) {
2.8 frystyk 596: HTChannel_setHost(host->channel, NULL);
2.10 frystyk 597:
2.12.2.6 eric 598: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
599: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
600:
2.10 frystyk 601: /*
602: ** We don't want to recursively delete ourselves so if we are
603: ** called from within the stream pipe then don't delete the channel
604: ** at this point
605: */
2.8 frystyk 606: HTChannel_delete(host->channel, status);
2.1 frystyk 607: host->expires = 0;
608: host->channel = NULL;
2.8 frystyk 609: HTNet_decreasePersistentSocket();
2.2 frystyk 610: if (CORE_TRACE)
611: HTTrace("Host info... removed host %p as persistent\n", host);
2.1 frystyk 612: return YES;
613: }
614: return NO;
615: }
616:
617: /*
2.8 frystyk 618: ** Handle the connection mode. The mode may change mode in the
619: ** middle of a connection.
620: */
621: PUBLIC HTTransportMode HTHost_mode (HTHost * host, BOOL * active)
622: {
623: return host ? host->mode : HT_TP_SINGLE;
624: }
625:
626: /*
627: ** If the new mode is lower than the old mode then adjust the pipeline
628: ** accordingly. That is, if we are going into single mode then move
629: ** all entries in the pipeline and move the rest to the pending
630: ** queue. They will get launched at a later point in time.
631: */
632: PUBLIC BOOL HTHost_setMode (HTHost * host, HTTransportMode mode)
633: {
634: if (host) {
635: /*
636: ** Check the new mode and see if we must adjust the queues.
637: */
638: if (mode == HT_TP_SINGLE && host->mode > mode) {
639: int piped = HTList_count(host->pipeline);
640: if (piped > 0) {
641: int cnt;
642: if (CORE_TRACE)
643: HTTrace("Host info... Moving %d Net objects from pipe line to pending queue\n", piped);
644: if (!host->pending) host->pending = HTList_new();
645: for (cnt=0; cnt<piped; cnt++) {
646: HTNet * net = HTList_removeFirstObject(host->pipeline);
2.12.2.12 eric 647: if (CORE_TRACE) HTTrace("Net Object.. Resetting %p\n", net);
648: (*net->event.cbf)(HTChannel_socket(host->channel), net->event.param, HTEvent_RESET);
2.8 frystyk 649: HTList_appendObject(host->pending, net);
650: }
651: }
652: }
2.12.2.7 frystyk 653: if (PROT_TRACE)
654: HTTrace("Host info... New mode is %d for host %p\n", host->mode, host);
2.8 frystyk 655: host->mode = mode;
2.12.2.12 eric 656: return HTHost_launchPending(host);
657: #if 0
658: {
659: HTNet * net = (HTNet *)HTList_firstObject(host->pipeline);
660: if (net)
661: return HTNet_start(net);
662: return YES;
663: }
664: #endif
2.8 frystyk 665: }
666: return NO;
667: }
668:
669: /*
670: ** Check whether a host is idle meaning if it is ready for a new
671: ** request which depends on the mode of the host. If the host is
672: ** idle, i.e. ready for use then return YES else NO. If the host supports
673: ** persistent connections then still only return idle if no requests are
674: ** ongoing.
675: */
676: PUBLIC BOOL HTHost_isIdle (HTHost * host)
677: {
678: return (host && HTList_count(host->pipeline) <= 0);
679: }
680:
2.12.2.1 eric 681: PRIVATE BOOL _roomInPipe (HTHost * host)
682: {
683: int count;
684: if (!host) return NO;
685: count = HTList_count(host->pipeline);
2.12.2.12 eric 686: switch (host->mode) {
687: case HT_TP_SINGLE:
688: return count <= 0;
689: case HT_TP_PIPELINE:
690: return count < MAX_PIPES;
691: case HT_TP_INTERLEAVE:
692: return YES;
693: }
694: return NO;
2.12.2.1 eric 695: }
696:
2.8 frystyk 697: /*
698: ** Add a net object to the host object. If the host
699: ** is idle then add to active list (pipeline) else add
700: ** it to the pending list
701: ** Return HT_PENDING if we must pend, HT_OK, or HT_ERROR
702: */
703: PUBLIC int HTHost_addNet (HTHost * host, HTNet * net)
704: {
705: if (host && net) {
706: int status = HT_OK;
707:
708: /* Check to see if we can get a socket */
709: if (HTNet_availableSockets() <= 0) {
710: if (!PendHost) PendHost = HTList_new();
711: if (CORE_TRACE)
712: HTTrace("Host info... Add Host %p as pending\n", host);
713: HTList_addObject(PendHost, host);
714: status = HT_PENDING;
715: }
716:
717: /* Add to either active or pending queue */
2.12.2.1 eric 718: if (_roomInPipe(host)) {
2.8 frystyk 719: if (CORE_TRACE) HTTrace("Host info... Add Net %p to pipeline of host %p\n", net, host);
720: if (!host->pipeline) host->pipeline = HTList_new();
721: HTList_addObject(host->pipeline, net);
2.12.2.8 eric 722: #if 0
2.8 frystyk 723: /*
724: ** We have been idle and must hence unregister our catch close
725: ** event handler
726: */
727: if (host->channel) {
2.12.2.1 eric 728: HTHost_unregister(host, net, HTEvent_CLOSE);
2.8 frystyk 729: }
2.12.2.8 eric 730: #endif
2.12.2.1 eric 731: /*
732: ** Send out the request if we're not blocked on write
733: */
734: if (!(host->registeredFor & HTEvent_BITS(HTEvent_WRITE)))
2.12.2.12 eric 735: status = HTHost_launchPending(host) == YES ? HT_OK : HT_ERROR;
2.8 frystyk 736: } else {
737: if (CORE_TRACE) HTTrace("Host info... Add Net %p as pending\n", net);
738: if (!host->pending) host->pending = HTList_new();
739: HTList_addObject(host->pending, net);
740: status = HT_PENDING;
741: }
742: return status;
743: }
744: return HT_ERROR;
745: }
746:
2.12.2.1 eric 747: PUBLIC BOOL HTHost_free (HTHost * host, int status)
748: {
749: if (host->channel == NULL) return NO;
750: if (host->persistent) {
751: if (CORE_TRACE)
752: HTTrace("Host Object. keeping socket %d\n", HTChannel_socket(host->channel));
753: HTChannel_delete(host->channel, status);
754: } else {
755: if (CORE_TRACE)
756: HTTrace("Host Object. closing socket %d\n", HTChannel_socket(host->channel));
757:
758: /*
759: ** By lowering the semaphore we make sure that the channel
760: ** is gonna be deleted
761: */
2.12.2.3 eric 762: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
763: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
764: host->registeredFor = 0;
2.12.2.1 eric 765: HTChannel_downSemaphore(host->channel);
766: HTChannel_delete(host->channel, status);
767: host->channel = NULL;
768: }
769: return YES;
770: }
771:
2.8 frystyk 772: PUBLIC BOOL HTHost_deleteNet (HTHost * host, HTNet * net)
773: {
774: if (host && net) {
775: if (CORE_TRACE)
776: HTTrace("Host info... Remove Net %p from pipe line\n", net);
777: HTList_removeObject(host->pipeline, net);
778: HTList_removeObject(host->pending, net);
779: return YES;
780: }
781: return NO;
782: }
783:
784: /*
785: ** Handle pending host objects.
786: ** There are two ways we can end up with pending reqyests:
787: ** 1) If we are out of sockets then register new host objects as pending.
788: ** 2) If we are pending on a connection then register new net objects as
789: ** pending
790: ** This set of functions handles pending host objects and can start new
791: ** requests as resources get available
792: */
793:
794: /*
795: ** Check this host object for any pending requests and return the next
796: ** registered Net object.
797: */
798: PUBLIC HTNet * HTHost_nextPendingNet (HTHost * host)
799: {
800: HTNet * net = NULL;
801: if (host && host->pending && host->pipeline) {
2.11 kahan 802: /*JK 23/Sep/96 Bug correction. Associated the following lines to the
803: **above if. There was a missing pair of brackets.
804: */
805: if ((net = (HTNet *) HTList_removeFirstObject(host->pending)) != NULL) {
806: if (PROT_TRACE)
807: HTTrace("Host info... Popping %p from pending net queue\n",
808: net);
2.8 frystyk 809: HTList_addObject(host->pipeline, net);
2.11 kahan 810: }
2.8 frystyk 811: }
812: return net;
813: }
814:
815: /*
2.12.2.1 eric 816: ** Return the current list of pending host objects waiting for a socket
2.8 frystyk 817: */
818: PUBLIC HTHost * HTHost_nextPendingHost (void)
819: {
820: HTHost * host = NULL;
821: if (PendHost) {
822: if ((host = (HTHost *) HTList_removeFirstObject(PendHost)) != NULL)
823: if (PROT_TRACE)
824: HTTrace("Host info... Poping %p from pending host queue\n",
825: host);
826: }
827: return host;
828: }
829:
830: /*
831: ** Start the next pending request if any. First we look for pending
832: ** requests for the same host and then we check for any other pending
833: ** hosts
834: */
835: PUBLIC BOOL HTHost_launchPending (HTHost * host)
836: {
837: int available = HTNet_availableSockets();
838:
839: if (!host) {
840: if (PROT_TRACE) HTTrace("Host info... Bad arguments\n");
841: return NO;
842: }
843:
844: /*
845: ** Check if we do have resources available for a new request
846: ** This can either be reusing an existing connection or opening a new one
847: */
848: if (available > 0 || host->mode >= HT_TP_PIPELINE) {
849:
850: /*
2.12.2.7 frystyk 851: ** In pipeline we can only have one doing writing at a time.
852: ** We therefore check that there are no other Net object
853: ** registered for write
2.12.2.1 eric 854: */
2.12.2.7 frystyk 855: if (host->mode == HT_TP_PIPELINE) {
856: HTNet * last = (HTNet *) HTList_lastObject(host->pipeline);
857: if (last && last->registeredFor == HTEvent_WRITE)
858: return NO;
859: }
2.12.2.1 eric 860:
861: /*
862: ** Check the current Host object for pending Net objects
2.8 frystyk 863: */
2.12.2.12 eric 864: if (host && _roomInPipe(host)) {
2.8 frystyk 865: HTNet * net = HTHost_nextPendingNet(host);
2.12.2.8 eric 866: if (net) return HTNet_execute(net, HTEvent_WRITE);
2.8 frystyk 867: }
868:
869: /*
870: ** Check for other pending Host objects
871: */
872: {
873: HTHost * pending = HTHost_nextPendingHost();
874: if (pending) {
875: HTNet * net = HTHost_nextPendingNet(pending);
2.12.2.8 eric 876: if (net) return HTNet_execute(net, HTEvent_WRITE);
2.8 frystyk 877: }
878: }
879: } else
2.12.2.1 eric 880: if (PROT_TRACE) HTTrace("Host info... No more requests.\n");
2.8 frystyk 881: return NO;
2.1 frystyk 882: }
2.11 kahan 883:
2.12.2.1 eric 884: PUBLIC HTNet * HTHost_firstNet (HTHost * host)
885: {
886: return (HTNet *) HTList_firstObject(host->pipeline);
887: }
888:
889: /*
890: ** The host event manager keeps track of the state of it's client engines
891: ** (typically HTTPEvent), accepting multiple blocks on read or write from
892: ** multiple pipelined engines. It then registers its own engine
893: ** (HostEvent) with the event manager.
894: */
2.12.2.4 frystyk 895: PUBLIC int HTHost_connect (HTHost * host, HTNet * net, char * url, HTProtocolId port)
2.12.2.1 eric 896: {
897: int status;
898: if (host && host->connecttime)
899: return HT_OK;
900: status = HTDoConnect(net, url, port);
901: if (status == HT_OK)
902: return HT_OK;
903: if (status == HT_WOULD_BLOCK || status == HT_PENDING)
904: return HT_WOULD_BLOCK;
905: return HT_ERROR; /* @@@ - some more deletion and stuff here? */
906: }
907:
908: /*
909: ** Rules: SINGLE: one element in pipe, either reading or writing
910: ** PIPE: n element in pipe, n-1 reading, 1 writing
911: */
2.12.2.3 eric 912: PUBLIC int HTHost_register (HTHost * host, HTNet * net, HTEventType type)
2.12.2.1 eric 913: {
2.12.2.7 frystyk 914: if (host && net) {
2.12.2.1 eric 915:
2.12.2.7 frystyk 916: /* net object may already be registered */
917: if (HTEvent_BITS(type) & net->registeredFor)
918: return NO;
919: net->registeredFor ^= HTEvent_BITS(type);
2.12.2.1 eric 920:
2.12.2.7 frystyk 921: /* host object may already be registered */
922: if (host->registeredFor & HTEvent_BITS(type))
923: return YES;
924: host->registeredFor ^= HTEvent_BITS(type);
2.12.2.10 frystyk 925: return HTEvent_register(HTChannel_socket(host->channel), type, *(host->events+HTEvent_INDEX(type)));
2.12.2.7 frystyk 926: }
927: return NO;
2.12.2.1 eric 928: }
929:
2.12.2.3 eric 930: PUBLIC int HTHost_unregister (HTHost * host, HTNet * net, HTEventType type)
2.12.2.1 eric 931: {
2.12.2.7 frystyk 932: if (host && net) {
2.12.2.1 eric 933:
2.12.2.7 frystyk 934: /* net object may no be registered */
935: if (!(HTEvent_BITS(type) & net->registeredFor))
936: return NO;
937: net->registeredFor ^= HTEvent_BITS(type);
2.11 kahan 938:
2.12.2.7 frystyk 939: /* host object may no be registered */
940: if (!(host->registeredFor & HTEvent_BITS(type)))
941: return YES;
942: host->registeredFor ^= HTEvent_BITS(type);
943:
944: /* stay registered for READ to catch a socket close */
945: /* WRITE and CONNECT can be unregistered, though */
946: if ((type == HTEvent_WRITE && isLastInPipe(host, net)) ||
947: type == HTEvent_CONNECT)
948: /* if we are blocked downstream, shut down the whole pipe */
949: HTEvent_unregister(HTChannel_socket(host->channel), type);
950: return YES;
951: }
952: return NO;
2.12.2.1 eric 953: }
2.11 kahan 954:
2.12.2.1 eric 955: /*
956: ** The reader tells HostEvent that it's stream did not finish the data
957: */
958: PUBLIC BOOL HTHost_setRemainingRead (HTHost * host, size_t remaining)
959: {
960: if (host == NULL) return NO;
961: host->remainingRead = remaining;
962: return YES;
963: }
2.11 kahan 964:
2.12.2.1 eric 965: PUBLIC SockA * HTHost_getSockAddr (HTHost * host)
966: {
967: if (!host) return NULL;
968: return &host->sock_addr;
969: }
970:
971: PUBLIC BOOL HTHost_setHome (HTHost * host, int home)
972: {
973: if (!host) return NO;
974: host->home = home;
975: return YES;
976: }
977:
978: PUBLIC int HTHost_home (HTHost * host)
979: {
980: if (!host) return 0;
981: return host->home;
982: }
983:
984: #if 0 /* Is a macro right now */
985: PUBLIC BOOL HTHost_setDNS5 (HTHost * host, HTdns * dns)
986: {
987: if (!host) return NO;
988: host->dns = dns;
989: return YES;
990: }
991: #endif
992:
993: PUBLIC BOOL HTHost_setChannel (HTHost * host, HTChannel * channel)
994: {
995: if (!host) return NO;
996: host->channel = channel;
997: return YES;
998: }
999:
1000: PUBLIC HTNet * HTHost_getReadNet(HTHost * host)
1001: {
2.12.2.2 frystyk 1002: if (host) {
2.12.2.7 frystyk 1003: if (host->mode == HT_TP_INTERLEAVE) {
1004: HTMuxChannel * muxch = HTMuxChannel_find(host);
1005: return HTMuxChannel_net(muxch);
1006: }
1007: return (HTNet *) HTList_firstObject(host->pipeline);
2.12.2.2 frystyk 1008: }
1009: return NULL;
1010: }
1011:
1012: PUBLIC HTNet * HTHost_getWriteNet(HTHost * host)
1013: {
1014: return host ? (HTNet *) HTList_lastObject(host->pipeline) : NULL;
2.12.2.1 eric 1015: }
1016:
1017: /*
1018: ** Create the input stream and bind it to the channel
1019: ** Please read the description in the HTIOStream module for the parameters
1020: */
2.12.2.2 frystyk 1021: PUBLIC HTInputStream * HTHost_getInput (HTHost * host, HTTransport * tp,
1022: void * param, int mode)
2.12.2.1 eric 1023: {
2.12.2.2 frystyk 1024: if (host && host->channel && tp) {
2.12.2.1 eric 1025: HTChannel * ch = host->channel;
1026: HTInputStream * input = (*tp->input_new)(host, ch, param, mode);
1027: HTChannel_setInput(ch, input);
2.12.2.12 eric 1028: return HTChannel_getChannelIStream(ch);
2.12.2.1 eric 1029: }
1030: if (CORE_TRACE) HTTrace("Host Object.. Can't create input stream\n");
2.12.2.2 frystyk 1031: return NULL;
1032: }
1033:
1034: PUBLIC HTOutputStream * HTHost_getOutput (HTHost * host, HTTransport * tp,
1035: void * param, int mode)
1036: {
1037: if (host && host->channel && tp) {
1038: HTChannel * ch = host->channel;
1039: HTOutputStream * output = (*tp->output_new)(host, ch, param, mode);
1040: HTChannel_setOutput(ch, output);
1041: return output;
1042: }
1043: if (CORE_TRACE) HTTrace("Host Object.. Can't create output stream\n");
1044: return NULL;
1045: }
1046:
1047: PUBLIC HTOutputStream * HTHost_output (HTHost * host, HTNet * net)
1048: {
1049: if (host && host->channel && net) {
1050: HTOutputStream * output = HTChannel_output(host->channel);
1051:
1052: /*
1053: ** If we are in MUX mode then create new output stream on top
1054: ** of the already existing one. Otherwise just return what we
1055: ** have.
1056: */
1057: if (host->mode == HT_TP_INTERLEAVE) {
2.12.2.4 frystyk 1058: HTStream * target = (HTStream *) HTChannel_output(host->channel);
1059: output = HTMuxWriter_new(host, net, target);
2.12.2.2 frystyk 1060: }
1061: return output;
1062: }
2.12.2.1 eric 1063: return NULL;
1064: }
1065:
2.12.2.8 eric 1066: PUBLIC int HTHost_read(HTHost * host, HTNet * net)
2.12.2.1 eric 1067: {
1068: HTInputStream * input = HTChannel_input(host->channel);
2.12.2.8 eric 1069: if (net != HTHost_getReadNet(host)) {
1070: HTHost_register(host, net, HTEvent_READ);
1071: return HT_WOULD_BLOCK;
1072: }
2.12.2.1 eric 1073: if (input == NULL) return HT_ERROR;
1074: return (*input->isa->read)(input);
1075: }
1076:
1077: PUBLIC BOOL HTHost_setConsumed(HTHost * host, size_t bytes)
1078: {
1079: HTInputStream * input;
1080: if (!host || !host->channel) return NO;
1081: if ((input = HTChannel_input(host->channel)) == NULL)
1082: return NO;
1083: return (*input->isa->consumed)(input, bytes);
1084: }
2.1 frystyk 1085:
2.12.2.7 frystyk 1086: PUBLIC int HTHost_hash (HTHost * host)
1087: {
1088: return host ? host->hash : -1;
1089: }
2.12.2.11 eric 1090:
1091: PUBLIC int HTHost_writeDelay(HTHost * host, int lastFlushTime, int buffSize)
1092: {
1093: if (host->forceWriteFlush)
1094: return 0;
1095: return 1000;
1096: }
1097:
1098: PUBLIC int HTHost_forceFlush(HTHost * host)
1099: {
1100: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
1101: int wasForced = host->forceWriteFlush;
1102: int ret;
1103: if (targetNet == NULL)
1104: return HT_ERROR;
1105: if (CORE_TRACE)
2.12.2.13 eric 1106: HTTrace(HTHIDE("HostEvent: FLUSH passed to %s.\n"),
2.12.2.11 eric 1107: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
1108: host->forceWriteFlush = YES;
1109: ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, HTEvent_FLUSH);
1110: host->forceWriteFlush = wasForced;
1111: return ret;
2.12.2.14! frystyk 1112: }
! 1113:
! 1114: PUBLIC int HTHost_eventTimeout (void)
! 1115: {
! 1116: return EventTimeout;
! 1117: }
! 1118:
! 1119: PUBLIC void HTHost_setEventTimeout (int millis)
! 1120: {
! 1121: EventTimeout = millis;
! 1122: if (CORE_TRACE) HTTrace("Host........ Setting event timeout to %d ms\n", millis);
2.12.2.11 eric 1123: }
1124:
1125: #if 0
1126: PRIVATE int lazyWriteFlushEvent (SOCKET soc, void * pVoid, HTEventType type)
1127: {
1128: HTOutputStream * stream = (HTOutputStream *) pVoid;
1129: HTBufferWriter_reallyFlush(me);
1130: return HT_OK;
1131: }
1132:
1133: /*
1134: ** HTHost_lazyFlush(host, cbf) - call cbf with an HTEvent_TIMEOUT
1135: ** when the host's write interval has expired.
1136: */
1137: PUBLIC int HTHost_lazyFlush (HTHost * host, int (*lazyFlush)(HTOutputStream *))
1138: {
1139: /*
1140: ** If we are allowed to delay the flush then register an event with the
1141: ** delay descibed by our delay variable. If we can't delay then flush
1142: ** right away.
1143: */
1144: if (host->delay_output) {
1145: HTChannel * ch = HTHost_channel(host);
1146: me->delay_event = HTEvent_new(FlushEvent, host, HT_PRIORITY_MAX, me->delay_ms);
1147: HTEvent_register(HTChannel_socket(ch), HTEvent_TIMEOUT, me->delay_event);
1148: me->delaying = YES;
1149: if (PROT_TRACE) HTTrace("Buffer...... Waiting...\n");
1150:
1151: int delay_ms; /* Delay in ms */
1152: BOOL delaying;
1153: HTEvent * delay_event;
1154: me->delay_ms = 10000;
1155:
1156: PUBLIC int HTHost_cancelLazyFlush(me->host)
1157: if (me->delay_event && me->delaying) {
1158: HTChannel * ch = HTHost_channel(me->host);
1159: HTEvent_unregister(HTChannel_socket(ch), HTEvent_TIMEOUT);
1160: me->delaying = NO;
1161: }
1162: #endif /* 0 */
1163:
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