Annotation of libwww/Library/src/HTHost.c, revision 2.21
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.
2.21 ! frystyk 6: ** @(#) $Id: HTHost.c,v 2.20 1996/12/07 19:49:08 frystyk Exp $
2.1 frystyk 7: **
8: ** This object manages the information that we know about a remote host.
9: ** This can for example be what type of host it is, and what version
10: ** it is using. We also keep track of persistent connections
11: **
12: ** April 96 HFN Written
13: */
14:
15: /* Library include files */
16: #include "sysdep.h"
17: #include "WWWUtil.h"
18: #include "HTParse.h"
19: #include "HTAlert.h"
20: #include "HTError.h"
21: #include "HTNetMan.h"
22: #include "HTTrans.h"
2.13 frystyk 23: #include "HTDNS.h"
24: #include "HTTPUtil.h"
25: #include "HTTCP.h"
2.1 frystyk 26: #include "HTHost.h" /* Implemented here */
2.13 frystyk 27: #include "HTHstMan.h"
2.1 frystyk 28:
29: #define HOST_TIMEOUT 43200L /* Default host timeout is 12 h */
30: #define TCP_TIMEOUT 3600L /* Default TCP timeout i 1 h */
2.19 frystyk 31: #define MAX_PIPES 50 /* maximum number of pipelined requests */
2.1 frystyk 32:
2.13 frystyk 33: struct _HTInputStream {
34: const HTInputStreamClass * isa;
2.1 frystyk 35: };
36:
2.13 frystyk 37: PRIVATE int HostEvent(SOCKET soc, void * pVoid, HTEventType type);
38:
39: /* Type definitions and global variables etc. local to this module */
2.1 frystyk 40: PRIVATE time_t HostTimeout = HOST_TIMEOUT; /* Timeout on host entries */
41: PRIVATE time_t TCPTimeout = TCP_TIMEOUT; /* Timeout on persistent channels */
42:
2.8 frystyk 43: PRIVATE HTList ** HostTable = NULL;
44: PRIVATE HTList * PendHost = NULL; /* List of pending host elements */
2.1 frystyk 45:
2.13 frystyk 46: PRIVATE int EventTimeout = -1; /* Global Host event timeout */
47:
2.1 frystyk 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: }
2.18 eric 62: {
63: int i;
64: for (i = 0; i < HTEvent_TYPES; i++)
65: HTEvent_delete(me->events[i]);
66: }
2.8 frystyk 67: HTList_delete(me->pipeline);
68: HTList_delete(me->pending);
2.1 frystyk 69: HT_FREE(me);
70: }
71: }
72:
73: PRIVATE BOOL delete_object (HTList * list, HTHost * me)
74: {
2.2 frystyk 75: if (CORE_TRACE) HTTrace("Host info... object %p from list %p\n", me, list);
2.1 frystyk 76: HTList_removeObject(list, (void *) me);
77: free_object(me);
78: return YES;
79: }
80:
2.13 frystyk 81: PRIVATE BOOL isLastInPipe (HTHost * host, HTNet * net)
82: {
83: return HTList_lastObject(host->pipeline) == net;
84: }
85:
86: /*
87: ** HostEvent - host event manager - recieves events from the event
88: ** manager and dispatches them to the client net objects by calling the
89: ** net object's cbf.
90: **
91: */
92: PRIVATE int HostEvent (SOCKET soc, void * pVoid, HTEventType type)
93: {
94: HTHost * host = (HTHost *)pVoid;
95:
2.18 eric 96: if (type == HTEvent_READ || type == HTEvent_CLOSE) {
2.13 frystyk 97: HTNet * targetNet;
98:
99: /* call the first net object */
100: do {
101: int ret;
102: targetNet = (HTNet *)HTList_firstObject(host->pipeline);
103: if (targetNet) {
104: if (CORE_TRACE)
2.14 frystyk 105: HTTrace(HTHIDE("Host Event.. READ passed to %s.\n"),
2.13 frystyk 106: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
107: if ((ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel),
108: targetNet->event.param, type)) != HT_OK)
109: return ret;
110: }
111: if (targetNet == NULL && host->remainingRead > 0) {
112: HTTrace("HostEvent... Error: %d bytes left to read and nowhere to put them\n", host->remainingRead);
113: host->remainingRead = 0;
114: /*
115: ** Fall through to close the channel
116: */
117: }
118: /* call pipelined net object to eat all the data in the channel */
119: } while (host->remainingRead > 0);
120:
121: /* last target net should have set remainingRead to 0 */
122: if (targetNet)
123: return HT_OK;
124:
125: /* If there was notargetNet, it should be a close */
2.14 frystyk 126: HTTrace(HTHIDE("Host Event.. host %s closed connection.\n"),
2.13 frystyk 127: host->hostname);
128:
129: /* Is there garbage in the channel? Let's check: */
130: {
131: char buf[256];
132: int ret;
133: while ((ret = NETREAD(HTChannel_socket(host->channel), buf, sizeof(buf))) > 0)
134: HTTrace(HTHIDE("Host %s had %d extraneous bytes.\n"));
135: }
136: HTHost_clearChannel(host, HT_OK);
137: return HT_OK; /* extra garbage does not constitute an application error */
138:
2.18 eric 139: } else if (type == HTEvent_WRITE || type == HTEvent_CONNECT) {
2.13 frystyk 140: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
141: if (targetNet) {
142: if (CORE_TRACE)
2.14 frystyk 143: HTTrace(HTHIDE("Host Event.. WRITE passed to %s.\n"),
2.13 frystyk 144: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
145: return (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, type);
146: }
2.14 frystyk 147: HTTrace(HTHIDE("Host Event.. Who wants to write to %s?\n"), host->hostname);
2.13 frystyk 148: return HT_ERROR;
2.14 frystyk 149: } else if (type == HTEvent_TIMEOUT) {
150:
151: if (CORE_TRACE)
152: HTTrace("Host Event.. WE SHOULD DELETE ALL REQUEST ON `%s\'?\n",
153: host->hostname);
2.13 frystyk 154:
2.14 frystyk 155: } else {
156: HTTrace(HTHIDE("Don't know how to handle OOB data from %s?\n"),
157: host->hostname);
158: }
2.13 frystyk 159: return HT_OK;
160: }
161:
2.1 frystyk 162: /*
163: ** Search the host info cache for a host object or create a new one
164: ** and add it. Examples of host names are
165: **
166: ** www.w3.org
167: ** www.foo.com:8000
168: ** 18.52.0.18
169: **
170: ** Returns Host object or NULL if error. You may get back an already
171: ** existing host object - you're not guaranteed a new one each time.
172: */
2.13 frystyk 173:
2.15 eric 174: PUBLIC HTHost * HTHost_new (char * host, u_short u_port)
2.1 frystyk 175: {
176: HTList * list = NULL; /* Current list in cache */
177: HTHost * pres = NULL;
2.13 frystyk 178: int hash = 0;
2.1 frystyk 179: if (!host) {
2.2 frystyk 180: if (CORE_TRACE) HTTrace("Host info... Bad argument\n");
2.1 frystyk 181: return NULL;
182: }
183:
184: /* Find a hash for this host */
185: {
186: char *ptr;
187: for (ptr=host; *ptr; ptr++)
2.13 frystyk 188: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.1 frystyk 189: if (!HostTable) {
2.13 frystyk 190: if ((HostTable = (HTList **) HT_CALLOC(HOST_HASH_SIZE,
2.1 frystyk 191: sizeof(HTList *))) == NULL)
192: HT_OUTOFMEM("HTHost_find");
193: }
194: if (!HostTable[hash]) HostTable[hash] = HTList_new();
195: list = HostTable[hash];
196: }
197:
198: /* Search the cache */
199: {
200: HTList * cur = list;
201: while ((pres = (HTHost *) HTList_nextObject(cur))) {
2.15 eric 202: if (!strcmp(pres->hostname, host) && u_port == pres->u_port) {
2.8 frystyk 203: if (HTHost_isIdle(pres) && time(NULL)>pres->ntime+HostTimeout){
2.2 frystyk 204: if (CORE_TRACE)
2.1 frystyk 205: HTTrace("Host info... Collecting host info %p\n",pres);
206: delete_object(list, pres);
207: pres = NULL;
208: }
209: break;
210: }
211: }
212: }
213:
2.8 frystyk 214: /* If not found then create new Host object, else use existing one */
2.1 frystyk 215: if (pres) {
216: if (pres->channel) {
2.13 frystyk 217: if (pres->expires && pres->expires < time(NULL)) { /* Cached channel is cold */
2.2 frystyk 218: if (CORE_TRACE)
2.1 frystyk 219: HTTrace("Host info... Persistent channel %p gotten cold\n",
220: pres->channel);
2.5 eric 221: HTChannel_delete(pres->channel, HT_OK);
2.1 frystyk 222: pres->channel = NULL;
223: } else {
2.2 frystyk 224: if (CORE_TRACE)
2.1 frystyk 225: HTTrace("Host info... REUSING CHANNEL %p\n",pres->channel);
226: }
227: }
228: } else {
229: if ((pres = (HTHost *) HT_CALLOC(1, sizeof(HTHost))) == NULL)
230: HT_OUTOFMEM("HTHost_add");
2.13 frystyk 231: pres->hash = hash;
2.1 frystyk 232: StrAllocCopy(pres->hostname, host);
2.15 eric 233: pres->u_port = u_port;
2.1 frystyk 234: pres->ntime = time(NULL);
2.8 frystyk 235: pres->mode = HT_TP_SINGLE;
2.18 eric 236: {
237: int i;
238: for (i = 0; i < HTEvent_TYPES; i++)
239: pres->events[i]= HTEvent_new(HostEvent, pres, HT_PRIORITY_MAX, EventTimeout);
240: }
2.2 frystyk 241: if (CORE_TRACE)
2.1 frystyk 242: HTTrace("Host info... added `%s\' to list %p\n", host, list);
243: HTList_addObject(list, (void *) pres);
244: }
245: return pres;
2.9 frystyk 246: }
247:
2.15 eric 248: PUBLIC HTHost * HTHost_newWParse (HTRequest * request, char * url, u_short u_port)
2.13 frystyk 249: {
250: char * port;
251: char * fullhost = NULL;
252: char * parsedHost = NULL;
253: SockA * sin;
254: HTHost * me;
255: char * proxy = HTRequest_proxy(request);
256:
257: fullhost = HTParse(proxy ? proxy : url, "", PARSE_HOST);
258:
259: /* If there's an @ then use the stuff after it as a hostname */
260: if (fullhost) {
261: char * at_sign;
262: if ((at_sign = strchr(fullhost, '@')) != NULL)
263: parsedHost = at_sign+1;
264: else
265: parsedHost = fullhost;
266: }
267: if (!parsedHost || !*parsedHost) {
268: HTRequest_addError(request, ERR_FATAL, NO, HTERR_NO_HOST,
269: NULL, 0, "HTDoConnect");
270: HT_FREE(fullhost);
271: return NULL;
272: }
273: port = strchr(parsedHost, ':');
274: if (PROT_TRACE)
275: HTTrace("HTDoConnect. Looking up `%s\'\n", parsedHost);
276: if (port) {
277: *port++ = '\0';
278: if (!*port || !isdigit(*port))
279: port = 0;
2.15 eric 280: u_port = atol(port);
2.13 frystyk 281: }
282: /* Find information about this host */
2.15 eric 283: if ((me = HTHost_new(parsedHost, u_port)) == NULL) {
2.13 frystyk 284: if (PROT_TRACE)HTTrace("HTDoConnect. Can't get host info\n");
285: me->tcpstate = TCP_ERROR;
286: return NULL;
287: }
288: sin = &me->sock_addr;
289: memset((void *) sin, '\0', sizeof(SockA));
290: #ifdef DECNET
291: sin->sdn_family = AF_DECnet;
292: net->sock_addr.sdn_objnum = port ? (unsigned char)(strtol(port, (char **) 0, 10)) : DNP_OBJ;
293: #else /* Internet */
294: sin->sin_family = AF_INET;
2.15 eric 295: sin->sin_port = htons(u_port);
2.13 frystyk 296: #endif
297: HT_FREE(fullhost); /* parsedHost points into fullhost */
298: return me;
299: }
300:
2.9 frystyk 301: /*
302: ** Search the host info cache for a host object. Examples of host names:
303: **
304: ** www.w3.org
305: ** www.foo.com:8000
306: ** 18.52.0.18
307: **
308: ** Returns Host object or NULL if not found.
309: */
310: PUBLIC HTHost * HTHost_find (char * host)
311: {
312: HTList * list = NULL; /* Current list in cache */
313: HTHost * pres = NULL;
314: if (CORE_TRACE)
315: HTTrace("Host info... Looking for `%s\'\n", host ? host : "<null>");
316:
317: /* Find a hash for this host */
318: if (host && HostTable) {
319: int hash = 0;
320: char *ptr;
321: for (ptr=host; *ptr; ptr++)
2.13 frystyk 322: hash = (int) ((hash * 3 + (*(unsigned char *) ptr)) % HOST_HASH_SIZE);
2.9 frystyk 323: if (!HostTable[hash]) return NULL;
324: list = HostTable[hash];
325:
326: /* Search the cache */
327: {
328: HTList * cur = list;
329: while ((pres = (HTHost *) HTList_nextObject(cur))) {
330: if (!strcmp(pres->hostname, host)) {
331: if (time(NULL) > pres->ntime + HostTimeout) {
332: if (CORE_TRACE)
333: HTTrace("Host info... Collecting host %p\n", pres);
334: delete_object(list, pres);
335: pres = NULL;
336: } else {
337: if (CORE_TRACE)
338: HTTrace("Host info... Found `%s\'\n", host);
339: }
340: return pres;
341: }
342: }
343: }
344: }
345: return NULL;
2.1 frystyk 346: }
347:
348: /*
2.8 frystyk 349: ** Get and set the hostname of the remote host
350: */
351: PUBLIC char * HTHost_name (HTHost * host)
352: {
353: return host ? host->hostname : NULL;
354: }
355:
356: /*
2.1 frystyk 357: ** Get and set the type class of the remote host
358: */
359: PUBLIC char * HTHost_class (HTHost * host)
360: {
361: return host ? host->type : NULL;
362: }
363:
364: PUBLIC void HTHost_setClass (HTHost * host, char * s_class)
365: {
366: if (host && s_class) StrAllocCopy(host->type, s_class);
367: }
368:
369: /*
370: ** Get and set the version of the remote host
371: */
372: PUBLIC int HTHost_version (HTHost *host)
373: {
374: return host ? host->version : 0;
375: }
376:
377: PUBLIC void HTHost_setVersion (HTHost * host, int version)
378: {
379: if (host) host->version = version;
380: }
381:
382: /*
383: ** Get and set the cache timeout for persistent entries.
384: ** The default value is TCP_TIMEOUT
385: */
386: PUBLIC void HTHost_setPersistTimeout (time_t timeout)
387: {
388: TCPTimeout = timeout;
389: }
390:
391: PUBLIC time_t HTHost_persistTimeout (time_t timeout)
392: {
393: return TCPTimeout;
394: }
395:
396: /* Persistent Connection Expiration
397: ** --------------------------------
398: ** Should normally not be used. If, then use calendar time.
399: */
400: PUBLIC void HTHost_setPersistExpires (HTHost * host, time_t expires)
401: {
402: if (host) host->expires = expires;
403: }
404:
405: PUBLIC time_t HTHost_persistExpires (HTHost * host)
406: {
407: return host ? host->expires : -1;
408: }
409:
410: /*
2.6 frystyk 411: ** Public methods for this host
412: */
413: PUBLIC HTMethod HTHost_publicMethods (HTHost * me)
414: {
415: return me ? me->methods : METHOD_INVALID;
416: }
417:
418: PUBLIC void HTHost_setPublicMethods (HTHost * me, HTMethod methodset)
419: {
420: if (me) me->methods = methodset;
421: }
422:
423: PUBLIC void HTHost_appendPublicMethods (HTHost * me, HTMethod methodset)
424: {
425: if (me) me->methods |= methodset;
426: }
427:
428: /*
429: ** Get and set the server name of the remote host
430: */
431: PUBLIC char * HTHost_server (HTHost * host)
432: {
433: return host ? host->server : NULL;
434: }
435:
436: PUBLIC BOOL HTHost_setServer (HTHost * host, const char * server)
437: {
438: if (host && server) {
439: StrAllocCopy(host->server, server);
440: return YES;
441: }
442: return NO;
443: }
444:
445: /*
446: ** Get and set the userAgent name of the remote host
447: */
448: PUBLIC char * HTHost_userAgent (HTHost * host)
449: {
450: return host ? host->user_agent : NULL;
451: }
452:
453: PUBLIC BOOL HTHost_setUserAgent (HTHost * host, const char * userAgent)
454: {
455: if (host && userAgent) {
456: StrAllocCopy(host->user_agent, userAgent);
457: return YES;
2.12 frystyk 458: }
459: return NO;
460: }
461:
462: /*
463: ** Get and set acceptable range units
464: */
465: PUBLIC char * HTHost_rangeUnits (HTHost * host)
466: {
467: return host ? host->range_units : NULL;
468: }
469:
470: PUBLIC BOOL HTHost_setRangeUnits (HTHost * host, const char * units)
471: {
472: if (host && units) {
473: StrAllocCopy(host->range_units, units);
474: return YES;
475: }
476: return NO;
477: }
478:
479: /*
480: ** Checks whether a specific range unit is OK. We always say
481: ** YES except if we have a specific statement from the server that
482: ** it doesn't understand byte ranges - that is - it has sent "none"
483: ** in a "Accept-Range" response header
484: */
485: PUBLIC BOOL HTHost_isRangeUnitAcceptable (HTHost * host, const char * unit)
486: {
487: if (host && unit) {
488: #if 0
489: if (host->range_units) {
490: char * start = strcasestr(host->range_units, "none");
491:
492: /*
493: ** Check that "none" is infact a token. It could be part of some
494: ** other valid string, so we'd better check for it.
495: */
496: if (start) {
497:
498:
499: }
500: return NO;
501: }
502: #endif
503: return strcasecomp(unit, "bytes") ? NO : YES;
2.6 frystyk 504: }
505: return NO;
506: }
507:
2.1 frystyk 508: /* HTHost_catchClose
509: ** -----------------
510: ** This function is registered when the socket is idle so that we get
511: ** a notification if the socket closes at the other end. At this point
512: ** we can't use the request object as it might have been freed a long
513: ** time ago.
514: */
2.13 frystyk 515: PUBLIC int HTHost_catchClose (SOCKET soc, void * context, HTEventType type)
2.1 frystyk 516: {
2.13 frystyk 517: HTNet * net = (HTNet *)context;
518: HTHost * host = net->host;
2.2 frystyk 519: if (CORE_TRACE)
2.13 frystyk 520: HTTrace("Catch Close. called with socket %d with type %x\n",
521: soc, type);
522: if (type == HTEvent_READ) {
2.1 frystyk 523: HTChannel * ch = HTChannel_find(soc); /* Find associated channel */
2.8 frystyk 524: HTHost * host = HTChannel_host(ch); /* and associated host */
2.1 frystyk 525: if (ch && host) {
2.2 frystyk 526: if (CORE_TRACE) HTTrace("Catch Close. CLOSING socket %d\n", soc);
2.8 frystyk 527: HTHost_clearChannel(host, HT_OK);
2.1 frystyk 528: } else {
2.2 frystyk 529: if (CORE_TRACE) HTTrace("Catch Close. socket %d NOT FOUND!\n",soc);
2.1 frystyk 530: }
531: }
2.13 frystyk 532: HTHost_unregister(host, net, HTEvent_CLOSE);
2.1 frystyk 533: return HT_OK;
534: }
535:
536: /*
537: ** As soon as we know that this host accepts persistent connections,
538: ** we associated the channel with the host.
539: ** We don't want more than MaxSockets-2 connections to be persistent in
540: ** order to avoid deadlock.
541: */
2.13 frystyk 542: PUBLIC BOOL HTHost_setPersistent (HTHost * host,
543: BOOL persistent,
544: HTTransportMode mode)
2.1 frystyk 545: {
2.13 frystyk 546: if (!host) return NO;
547:
548: if (!persistent) {
549: /*
550: ** We use the HT_IGNORE status code as we don't want to free
551: ** the stream at this point in time. The situation we want to
552: ** avoid is that we free the channel from within the stream pipe.
553: ** This will lead to an infinite look having the stream freing
554: ** itself.
555: */
556: return HTHost_clearChannel(host, HT_IGNORE);
557: }
558:
2.18 eric 559: /*
560: ** Set the host persistent if not already. Also update the mode to
561: ** the new one - it may have changed
562: */
563: HTHost_setMode(host, mode);
564: if (!host->persistent) {
2.13 frystyk 565: SOCKET sockfd = HTChannel_socket(host->channel);
2.8 frystyk 566: if (sockfd != INVSOC && HTNet_availablePersistentSockets() > 0) {
2.13 frystyk 567: host->persistent = YES;
2.1 frystyk 568: host->expires = time(NULL) + TCPTimeout; /* Default timeout */
2.13 frystyk 569: HTChannel_setHost(host->channel, host);
2.8 frystyk 570: HTNet_increasePersistentSocket();
2.2 frystyk 571: if (CORE_TRACE)
2.1 frystyk 572: HTTrace("Host info... added host %p as persistent\n", host);
573: return YES;
574: } else {
2.2 frystyk 575: if (CORE_TRACE)
576: HTTrace("Host info... no room for persistent socket %d\n",
2.7 frystyk 577: sockfd);
2.18 eric 578: return NO;
2.1 frystyk 579: }
2.18 eric 580: } else {
581: if (CORE_TRACE) HTTrace("Host info... %p already persistent\n", host);
582: return YES;
2.1 frystyk 583: }
584: return NO;
585: }
586:
587: /*
2.13 frystyk 588: ** Check whether we have a persistent channel or not
589: */
590: PUBLIC BOOL HTHost_isPersistent (HTHost * host)
591: {
592: return host && host->persistent;
593: }
594:
595: /*
2.1 frystyk 596: ** Find persistent channel associated with this host.
597: */
598: PUBLIC HTChannel * HTHost_channel (HTHost * host)
599: {
600: return host ? host->channel : NULL;
601: }
602:
603: /*
604: ** Clear the persistent entry by deleting the channel object. Note that
605: ** the channel object is only deleted if it's not used anymore.
606: */
2.8 frystyk 607: PUBLIC BOOL HTHost_clearChannel (HTHost * host, int status)
2.1 frystyk 608: {
609: if (host && host->channel) {
2.8 frystyk 610: HTChannel_setHost(host->channel, NULL);
2.10 frystyk 611:
2.13 frystyk 612: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
613: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
2.18 eric 614: host->registeredFor = 0;
2.13 frystyk 615:
2.10 frystyk 616: /*
617: ** We don't want to recursively delete ourselves so if we are
618: ** called from within the stream pipe then don't delete the channel
619: ** at this point
620: */
2.8 frystyk 621: HTChannel_delete(host->channel, status);
2.18 eric 622: host->expires = 0;
2.1 frystyk 623: host->channel = NULL;
2.8 frystyk 624: HTNet_decreasePersistentSocket();
2.2 frystyk 625: if (CORE_TRACE)
626: HTTrace("Host info... removed host %p as persistent\n", host);
2.1 frystyk 627: return YES;
628: }
629: return NO;
630: }
631:
632: /*
2.18 eric 633: ** Move all entries in the pipeline and move the rest to the pending
634: ** queue. They will get launched at a later point in time.
635: */
636: PUBLIC BOOL HTHost_recoverPipe (HTHost * host)
637: {
638: if (host) {
639: int piped = HTList_count(host->pipeline);
640: if (piped > 0) {
641: int cnt;
642: if (CORE_TRACE)
643: HTTrace("Host recover Moving %d Net objects from pipe line to pending queue\n", piped);
644:
645: /*
646: ** Unregister this host for all events
647: */
648: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
649: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
650: host->registeredFor = 0;
651:
652: /*
653: ** Set new mode to single until we know what is going on
654: */
655: host->mode = HT_TP_SINGLE;
656:
657: /*
658: ** Move all net objects from the net object to the pending queue.
659: */
660: if (!host->pending) host->pending = HTList_new();
661: for (cnt=0; cnt<piped; cnt++) {
662: HTNet * net = HTList_removeLastObject(host->pipeline);
663: if (CORE_TRACE) HTTrace("Host recover Resetting net object %p\n", net);
664: net->registeredFor = 0;
665: (*net->event.cbf)(HTChannel_socket(host->channel), net->event.param, HTEvent_RESET);
666: HTList_appendObject(host->pending, net);
667: }
668: HTChannel_setSemaphore(host->channel, 0);
669: HTHost_clearChannel(host, HT_INTERRUPTED);
670: }
671: return HTHost_launchPending(host);
672: }
673: return NO;
674: }
675:
676: /*
2.8 frystyk 677: ** Handle the connection mode. The mode may change mode in the
678: ** middle of a connection.
679: */
680: PUBLIC HTTransportMode HTHost_mode (HTHost * host, BOOL * active)
681: {
682: return host ? host->mode : HT_TP_SINGLE;
683: }
684:
685: /*
686: ** If the new mode is lower than the old mode then adjust the pipeline
687: ** accordingly. That is, if we are going into single mode then move
688: ** all entries in the pipeline and move the rest to the pending
689: ** queue. They will get launched at a later point in time.
690: */
691: PUBLIC BOOL HTHost_setMode (HTHost * host, HTTransportMode mode)
692: {
693: if (host) {
694: /*
695: ** Check the new mode and see if we must adjust the queues.
696: */
697: if (mode == HT_TP_SINGLE && host->mode > mode) {
698: int piped = HTList_count(host->pipeline);
699: if (piped > 0) {
700: int cnt;
701: if (CORE_TRACE)
702: HTTrace("Host info... Moving %d Net objects from pipe line to pending queue\n", piped);
703: if (!host->pending) host->pending = HTList_new();
704: for (cnt=0; cnt<piped; cnt++) {
2.18 eric 705: HTNet * net = HTList_removeLastObject(host->pipeline);
706: if (CORE_TRACE) HTTrace("Host info... Resetting net object %p\n", net);
2.13 frystyk 707: (*net->event.cbf)(HTChannel_socket(host->channel), net->event.param, HTEvent_RESET);
2.8 frystyk 708: HTList_appendObject(host->pending, net);
709: }
2.18 eric 710: HTChannel_setSemaphore(host->channel, 0);
711: HTHost_clearChannel(host, HT_INTERRUPTED);
2.8 frystyk 712: }
2.18 eric 713: }
714: host->mode = mode;
2.13 frystyk 715: if (PROT_TRACE)
716: HTTrace("Host info... New mode is %d for host %p\n", host->mode, host);
2.8 frystyk 717: }
718: return NO;
719: }
720:
721: /*
722: ** Check whether a host is idle meaning if it is ready for a new
723: ** request which depends on the mode of the host. If the host is
724: ** idle, i.e. ready for use then return YES else NO. If the host supports
725: ** persistent connections then still only return idle if no requests are
726: ** ongoing.
727: */
728: PUBLIC BOOL HTHost_isIdle (HTHost * host)
729: {
730: return (host && HTList_count(host->pipeline) <= 0);
731: }
732:
2.13 frystyk 733: PRIVATE BOOL _roomInPipe (HTHost * host)
734: {
735: int count;
736: if (!host) return NO;
737: count = HTList_count(host->pipeline);
738: switch (host->mode) {
739: case HT_TP_SINGLE:
740: return count <= 0;
741: case HT_TP_PIPELINE:
742: return count < MAX_PIPES;
743: case HT_TP_INTERLEAVE:
744: return YES;
745: }
746: return NO;
747: }
748:
2.8 frystyk 749: /*
750: ** Add a net object to the host object. If the host
751: ** is idle then add to active list (pipeline) else add
752: ** it to the pending list
753: ** Return HT_PENDING if we must pend, HT_OK, or HT_ERROR
754: */
755: PUBLIC int HTHost_addNet (HTHost * host, HTNet * net)
756: {
757: if (host && net) {
758: int status = HT_OK;
759:
2.18 eric 760: /*
761: ** If we don't have a socket already then check to see if we can get
762: ** one. Otherwise we put the host object into our pending queue.
763: */
764: if (!host->channel && HTNet_availableSockets() <= 0) {
2.8 frystyk 765: if (!PendHost) PendHost = HTList_new();
766: if (CORE_TRACE)
767: HTTrace("Host info... Add Host %p as pending\n", host);
768: HTList_addObject(PendHost, host);
769: status = HT_PENDING;
770: }
771:
2.18 eric 772: /*
773: ** Add net object to either active or pending queue.
774: */
2.13 frystyk 775: if (_roomInPipe(host)) {
2.8 frystyk 776: if (CORE_TRACE) HTTrace("Host info... Add Net %p to pipeline of host %p\n", net, host);
777: if (!host->pipeline) host->pipeline = HTList_new();
778: HTList_addObject(host->pipeline, net);
2.18 eric 779:
2.13 frystyk 780: /*
781: ** Send out the request if we're not blocked on write
782: */
783: if (!(host->registeredFor & HTEvent_BITS(HTEvent_WRITE)))
784: status = HTHost_launchPending(host) == YES ? HT_OK : HT_ERROR;
2.8 frystyk 785: } else {
786: if (CORE_TRACE) HTTrace("Host info... Add Net %p as pending\n", net);
787: if (!host->pending) host->pending = HTList_new();
788: HTList_addObject(host->pending, net);
789: status = HT_PENDING;
790: }
791: return status;
792: }
793: return HT_ERROR;
794: }
795:
2.13 frystyk 796: PUBLIC BOOL HTHost_free (HTHost * host, int status)
797: {
798: if (host->channel == NULL) return NO;
799: if (host->persistent) {
800: if (CORE_TRACE)
801: HTTrace("Host Object. keeping socket %d\n", HTChannel_socket(host->channel));
802: HTChannel_delete(host->channel, status);
803: } else {
804: if (CORE_TRACE)
805: HTTrace("Host Object. closing socket %d\n", HTChannel_socket(host->channel));
806:
807: /*
808: ** By lowering the semaphore we make sure that the channel
809: ** is gonna be deleted
810: */
811: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_READ);
812: HTEvent_unregister(HTChannel_socket(host->channel), HTEvent_WRITE);
813: host->registeredFor = 0;
814: HTChannel_downSemaphore(host->channel);
815: HTChannel_delete(host->channel, status);
816: host->channel = NULL;
817: }
818: return YES;
819: }
820:
2.8 frystyk 821: PUBLIC BOOL HTHost_deleteNet (HTHost * host, HTNet * net)
822: {
823: if (host && net) {
824: if (CORE_TRACE)
825: HTTrace("Host info... Remove Net %p from pipe line\n", net);
826: HTList_removeObject(host->pipeline, net);
827: HTList_removeObject(host->pending, net);
828: return YES;
829: }
830: return NO;
831: }
832:
833: /*
834: ** Handle pending host objects.
835: ** There are two ways we can end up with pending reqyests:
836: ** 1) If we are out of sockets then register new host objects as pending.
837: ** 2) If we are pending on a connection then register new net objects as
838: ** pending
839: ** This set of functions handles pending host objects and can start new
840: ** requests as resources get available
841: */
842:
843: /*
844: ** Check this host object for any pending requests and return the next
845: ** registered Net object.
846: */
847: PUBLIC HTNet * HTHost_nextPendingNet (HTHost * host)
848: {
849: HTNet * net = NULL;
850: if (host && host->pending && host->pipeline) {
2.18 eric 851: /*JK 23/Sep/96 Bug correction. Associated the following lines to the
852: **above if. There was a missing pair of brackets.
853: */
854: if ((net = (HTNet *) HTList_removeFirstObject(host->pending)) != NULL) {
855: if (PROT_TRACE)
856: HTTrace("Host info... Popping %p from pending net queue\n", net);
857: HTList_addObject(host->pipeline, net);
858: }
2.8 frystyk 859: }
860: return net;
861: }
862:
863: /*
2.13 frystyk 864: ** Return the current list of pending host objects waiting for a socket
2.8 frystyk 865: */
866: PUBLIC HTHost * HTHost_nextPendingHost (void)
867: {
868: HTHost * host = NULL;
869: if (PendHost) {
870: if ((host = (HTHost *) HTList_removeFirstObject(PendHost)) != NULL)
871: if (PROT_TRACE)
872: HTTrace("Host info... Poping %p from pending host queue\n",
873: host);
874: }
875: return host;
876: }
877:
878: /*
879: ** Start the next pending request if any. First we look for pending
880: ** requests for the same host and then we check for any other pending
881: ** hosts
882: */
883: PUBLIC BOOL HTHost_launchPending (HTHost * host)
884: {
885: int available = HTNet_availableSockets();
886:
887: if (!host) {
888: if (PROT_TRACE) HTTrace("Host info... Bad arguments\n");
889: return NO;
890: }
891:
892: /*
893: ** Check if we do have resources available for a new request
894: ** This can either be reusing an existing connection or opening a new one
895: */
896: if (available > 0 || host->mode >= HT_TP_PIPELINE) {
897:
898: /*
2.13 frystyk 899: ** In pipeline we can only have one doing writing at a time.
900: ** We therefore check that there are no other Net object
901: ** registered for write
902: */
903: if (host->mode == HT_TP_PIPELINE) {
904: HTNet * last = (HTNet *) HTList_lastObject(host->pipeline);
905: if (last && last->registeredFor == HTEvent_WRITE)
906: return NO;
907: }
908:
909: /*
910: ** Check the current Host object for pending Net objects
2.8 frystyk 911: */
2.13 frystyk 912: if (host && _roomInPipe(host)) {
2.8 frystyk 913: HTNet * net = HTHost_nextPendingNet(host);
2.13 frystyk 914: if (net) return HTNet_execute(net, HTEvent_WRITE);
2.8 frystyk 915: }
916:
917: /*
918: ** Check for other pending Host objects
919: */
920: {
921: HTHost * pending = HTHost_nextPendingHost();
922: if (pending) {
923: HTNet * net = HTHost_nextPendingNet(pending);
2.13 frystyk 924: if (net) return HTNet_execute(net, HTEvent_WRITE);
2.8 frystyk 925: }
926: }
2.13 frystyk 927: } else
928: if (PROT_TRACE) HTTrace("Host info... No more requests.\n");
929: return NO;
930: }
931:
932: PUBLIC HTNet * HTHost_firstNet (HTHost * host)
933: {
934: return (HTNet *) HTList_firstObject(host->pipeline);
935: }
936:
937: /*
938: ** The host event manager keeps track of the state of it's client engines
939: ** (typically HTTPEvent), accepting multiple blocks on read or write from
940: ** multiple pipelined engines. It then registers its own engine
941: ** (HostEvent) with the event manager.
942: */
943: PUBLIC int HTHost_connect (HTHost * host, HTNet * net, char * url, HTProtocolId port)
944: {
945: int status;
2.18 eric 946: /* if (host && host->connecttime)
2.13 frystyk 947: return HT_OK;
2.18 eric 948: */
2.13 frystyk 949: status = HTDoConnect(net, url, port);
950: if (status == HT_OK)
951: return HT_OK;
952: if (status == HT_WOULD_BLOCK || status == HT_PENDING)
953: return HT_WOULD_BLOCK;
954: return HT_ERROR; /* @@@ - some more deletion and stuff here? */
955: }
956:
957: /*
958: ** Rules: SINGLE: one element in pipe, either reading or writing
959: ** PIPE: n element in pipe, n-1 reading, 1 writing
960: */
961: PUBLIC int HTHost_register (HTHost * host, HTNet * net, HTEventType type)
962: {
963: if (host && net) {
964:
965: /* net object may already be registered */
966: if (HTEvent_BITS(type) & net->registeredFor)
967: return NO;
968: net->registeredFor ^= HTEvent_BITS(type);
969:
970: /* host object may already be registered */
971: if (host->registeredFor & HTEvent_BITS(type))
972: return YES;
973: host->registeredFor ^= HTEvent_BITS(type);
974: return HTEvent_register(HTChannel_socket(host->channel), type, *(host->events+HTEvent_INDEX(type)));
975: }
976: return NO;
977: }
978:
979: PUBLIC int HTHost_unregister (HTHost * host, HTNet * net, HTEventType type)
980: {
981: if (host && net) {
982:
983: /* net object may no be registered */
984: if (!(HTEvent_BITS(type) & net->registeredFor))
985: return NO;
986: net->registeredFor ^= HTEvent_BITS(type);
987:
988: /* host object may no be registered */
989: if (!(host->registeredFor & HTEvent_BITS(type)))
990: return YES;
991: host->registeredFor ^= HTEvent_BITS(type);
992:
993: /* stay registered for READ to catch a socket close */
994: /* WRITE and CONNECT can be unregistered, though */
995: if ((type == HTEvent_WRITE && isLastInPipe(host, net)) ||
996: type == HTEvent_CONNECT)
997: /* if we are blocked downstream, shut down the whole pipe */
998: HTEvent_unregister(HTChannel_socket(host->channel), type);
999: return YES;
1000: }
1001: return NO;
1002: }
1003:
1004: /*
1005: ** The reader tells HostEvent that it's stream did not finish the data
1006: */
1007: PUBLIC BOOL HTHost_setRemainingRead (HTHost * host, size_t remaining)
1008: {
1009: if (host == NULL) return NO;
1010: host->remainingRead = remaining;
2.20 frystyk 1011: if (PROT_TRACE) HTTrace("Host........ %d bytes remaining \n", remaining);
2.13 frystyk 1012: return YES;
1013: }
1014:
1015: PUBLIC SockA * HTHost_getSockAddr (HTHost * host)
1016: {
1017: if (!host) return NULL;
1018: return &host->sock_addr;
1019: }
1020:
1021: PUBLIC BOOL HTHost_setHome (HTHost * host, int home)
1022: {
1023: if (!host) return NO;
1024: host->home = home;
1025: return YES;
1026: }
1027:
1028: PUBLIC int HTHost_home (HTHost * host)
1029: {
1030: if (!host) return 0;
1031: return host->home;
1032: }
1033:
1034: #if 0 /* Is a macro right now */
2.21 ! frystyk 1035: PRIVATE BOOL HTHost_setDNS5 (HTHost * host, HTdns * dns)
2.13 frystyk 1036: {
1037: if (!host) return NO;
1038: host->dns = dns;
1039: return YES;
1040: }
1041: #endif
1042:
1043: PUBLIC BOOL HTHost_setChannel (HTHost * host, HTChannel * channel)
1044: {
1045: if (!host) return NO;
1046: host->channel = channel;
1047: return YES;
1048: }
1049:
1050: PUBLIC HTNet * HTHost_getReadNet(HTHost * host)
1051: {
1052: if (host) {
1053: if (host->mode == HT_TP_INTERLEAVE) {
2.21 ! frystyk 1054: #ifdef HT_MUX
2.13 frystyk 1055: HTMuxChannel * muxch = HTMuxChannel_find(host);
1056: return HTMuxChannel_net(muxch);
2.21 ! frystyk 1057: #endif
2.13 frystyk 1058: }
1059: return (HTNet *) HTList_firstObject(host->pipeline);
1060: }
1061: return NULL;
1062: }
1063:
1064: PUBLIC HTNet * HTHost_getWriteNet(HTHost * host)
1065: {
1066: return host ? (HTNet *) HTList_lastObject(host->pipeline) : NULL;
1067: }
1068:
1069: /*
1070: ** Create the input stream and bind it to the channel
1071: ** Please read the description in the HTIOStream module for the parameters
1072: */
1073: PUBLIC HTInputStream * HTHost_getInput (HTHost * host, HTTransport * tp,
1074: void * param, int mode)
1075: {
1076: if (host && host->channel && tp) {
1077: HTChannel * ch = host->channel;
1078: HTInputStream * input = (*tp->input_new)(host, ch, param, mode);
1079: HTChannel_setInput(ch, input);
1080: return HTChannel_getChannelIStream(ch);
1081: }
1082: if (CORE_TRACE) HTTrace("Host Object.. Can't create input stream\n");
1083: return NULL;
1084: }
1085:
1086: PUBLIC HTOutputStream * HTHost_getOutput (HTHost * host, HTTransport * tp,
1087: void * param, int mode)
1088: {
1089: if (host && host->channel && tp) {
1090: HTChannel * ch = host->channel;
1091: HTOutputStream * output = (*tp->output_new)(host, ch, param, mode);
1092: HTChannel_setOutput(ch, output);
1093: return output;
1094: }
1095: if (CORE_TRACE) HTTrace("Host Object.. Can't create output stream\n");
1096: return NULL;
1097: }
1098:
1099: PUBLIC HTOutputStream * HTHost_output (HTHost * host, HTNet * net)
1100: {
1101: if (host && host->channel && net) {
1102: HTOutputStream * output = HTChannel_output(host->channel);
2.8 frystyk 1103:
1104: /*
2.13 frystyk 1105: ** If we are in MUX mode then create new output stream on top
1106: ** of the already existing one. Otherwise just return what we
1107: ** have.
2.8 frystyk 1108: */
2.13 frystyk 1109: if (host->mode == HT_TP_INTERLEAVE) {
2.21 ! frystyk 1110: #ifdef HT_MUX
2.13 frystyk 1111: HTStream * target = (HTStream *) HTChannel_output(host->channel);
1112: output = HTMuxWriter_new(host, net, target);
2.21 ! frystyk 1113: #endif
2.8 frystyk 1114: }
2.13 frystyk 1115: return output;
1116: }
1117: return NULL;
1118: }
1119:
1120: PUBLIC int HTHost_read(HTHost * host, HTNet * net)
1121: {
1122: HTInputStream * input = HTChannel_input(host->channel);
1123: if (net != HTHost_getReadNet(host)) {
1124: HTHost_register(host, net, HTEvent_READ);
1125: return HT_WOULD_BLOCK;
1126: }
2.17 frystyk 1127:
1128: /*
1129: ** If there is no input channel then this can either mean that
1130: ** we have lost the channel or an error occurred. We return
1131: ** HT_CLOSED as this is a sign to the caller that we don't
1132: ** have a channel
1133: */
1134: return input ? (*input->isa->read)(input) : HT_CLOSED;
2.13 frystyk 1135: }
1136:
1137: PUBLIC BOOL HTHost_setConsumed(HTHost * host, size_t bytes)
1138: {
1139: HTInputStream * input;
1140: if (!host || !host->channel) return NO;
1141: if ((input = HTChannel_input(host->channel)) == NULL)
1142: return NO;
2.20 frystyk 1143: if (PROT_TRACE)
1144: HTTrace("Host........ passing %d bytes as consumed to %p\n", bytes, input);
2.13 frystyk 1145: return (*input->isa->consumed)(input, bytes);
1146: }
1147:
1148: PUBLIC int HTHost_hash (HTHost * host)
1149: {
1150: return host ? host->hash : -1;
1151: }
1152:
2.14 frystyk 1153: PUBLIC int HTHost_writeDelay(HTHost * host, ms_t lastFlushTime, int buffSize)
2.13 frystyk 1154: {
2.15 eric 1155: unsigned short mtu;
2.18 eric 1156: int ret = -1;
2.15 eric 1157: int socket = HTChannel_socket(host->channel);
2.18 eric 1158: #ifndef WWW_MSWINDOWS
2.15 eric 1159: ret = ioctl(socket, 666, (unsigned long)&mtu);
2.18 eric 1160: #endif /* WWW_MSWINDOWS */
2.15 eric 1161: if ((ret == 0 && buffSize >= mtu) || host->forceWriteFlush)
2.13 frystyk 1162: return 0;
1163: return 1000;
1164: }
1165:
1166: PUBLIC int HTHost_forceFlush(HTHost * host)
1167: {
1168: HTNet * targetNet = (HTNet *)HTList_lastObject(host->pipeline);
1169: int wasForced = host->forceWriteFlush;
1170: int ret;
1171: if (targetNet == NULL)
1172: return HT_ERROR;
1173: if (CORE_TRACE)
2.14 frystyk 1174: HTTrace(HTHIDE("Host Event.. FLUSH passed to %s.\n"),
2.13 frystyk 1175: HTHIDE(HTAnchor_physical(HTRequest_anchor(HTNet_request(targetNet)))));
1176: host->forceWriteFlush = YES;
1177: ret = (*targetNet->event.cbf)(HTChannel_socket(host->channel), targetNet->event.param, HTEvent_FLUSH);
1178: host->forceWriteFlush = wasForced;
1179: return ret;
2.1 frystyk 1180: }
2.11 kahan 1181:
2.13 frystyk 1182: PUBLIC int HTHost_eventTimeout (void)
1183: {
1184: return EventTimeout;
1185: }
2.11 kahan 1186:
2.13 frystyk 1187: PUBLIC void HTHost_setEventTimeout (int millis)
1188: {
1189: EventTimeout = millis;
1190: if (CORE_TRACE) HTTrace("Host........ Setting event timeout to %d ms\n", millis);
1191: }
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