connection.c 24.1 KB
Newer Older
Kurt Zeilenga's avatar
Kurt Zeilenga committed
1
#include "portable.h"
Kurt Zeilenga's avatar
Kurt Zeilenga committed
2
3
4

#include <stdio.h>

5
#include <ac/socket.h>
Kurt Zeilenga's avatar
Kurt Zeilenga committed
6
7
8
9
10
#include <ac/errno.h>
#include <ac/signal.h>
#include <ac/string.h>
#include <ac/time.h>

Kurt Zeilenga's avatar
Kurt Zeilenga committed
11
12
#include "slap.h"

Kurt Zeilenga's avatar
Kurt Zeilenga committed
13
14
15
/* we need LBER internals */
#include "../../libraries/liblber/lber-int.h"

16
17
18
/* protected by connections_mutex */
static ldap_pvt_thread_mutex_t connections_mutex;
static Connection *connections = NULL;
19
static unsigned long conn_nextid = 0;
20

21
/* structure state (protected by connections_mutex) */
22
23
24
#define SLAP_C_UNINITIALIZED	0x00	/* MUST BE ZERO (0) */
#define SLAP_C_UNUSED			0x01
#define SLAP_C_USED				0x02
25
26

/* connection state (protected by c_mutex ) */
27
28
29
30
31
#define SLAP_C_INVALID			0x00	/* MUST BE ZERO (0) */
#define SLAP_C_INACTIVE			0x01	/* zero threads */
#define SLAP_C_ACTIVE			0x02	/* one or more threads */
#define SLAP_C_BINDING			0x03	/* binding */
#define SLAP_C_CLOSING			0x04	/* closing */
32

33
34
35
36
37
38
39
40
41
42
43
44
char* connection_state2str( int state ) {
	switch( state ) {
	case SLAP_C_INVALID:	return "!";		
	case SLAP_C_INACTIVE:	return "|";		
	case SLAP_C_ACTIVE:		return "";			
	case SLAP_C_BINDING:	return "B";
	case SLAP_C_CLOSING:	return "C";			
	}

	return "?";
}

45
static Connection* connection_get( ber_socket_t s );
46
47

static int connection_input( Connection *c );
48
static void connection_close( Connection *c );
49

50
51
static int connection_op_activate( Connection *conn, Operation *op );
static int connection_resched( Connection *conn );
52
static void connection_abandon( Connection *conn );
53
static void connection_destroy( Connection *c );
54

Kurt Zeilenga's avatar
Kurt Zeilenga committed
55
56
57
58
59
struct co_arg {
	Connection	*co_conn;
	Operation	*co_op;
};

60
61
62
63
64
65
66
/*
 * Initialize connection management infrastructure.
 */
int connections_init(void)
{
	assert( connections == NULL );

67
	if( connections != NULL) {
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
		Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
			0, 0, 0 );
		return -1;
	}

	/* should check return of every call */
	ldap_pvt_thread_mutex_init( &connections_mutex );

	connections = (Connection *) calloc( dtblsize, sizeof(Connection) );

	if( connections == NULL ) {
		Debug( LDAP_DEBUG_ANY,
			"connections_init: allocation (%d*%ld) of connection array failed.\n",
			dtblsize, (long) sizeof(Connection), 0 );
		return -1;
	}

85
86
87
    assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
    assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );

88
89
90
91
92
93
94
95
	/*
	 * per entry initialization of the Connection array initialization
	 * will be done by connection_init()
	 */ 

	return 0;
}

96
97
98
99
100
/*
 * Destroy connection management infrastructure.
 */
int connections_destroy(void)
{
101
	ber_socket_t i;
102
103
104
105
106
107
108
109
110
111

	/* should check return of every call */

	if( connections == NULL) {
		Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
			0, 0, 0 );
		return -1;
	}

	for ( i = 0; i < dtblsize; i++ ) {
112
113
114
115
116
		if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
			ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
			ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
			ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
		}
117
118
119
120
121
122
123
124
125
126
127
128
129
130
	}

	free( connections );
	connections = NULL;

	ldap_pvt_thread_mutex_destroy( &connections_mutex );
	return 0;
}

/*
 * shutdown all connections
 */
int connections_shutdown(void)
{
131
	ber_socket_t i;
132
133
134
135
136
137
138
139
140

	ldap_pvt_thread_mutex_lock( &connections_mutex );

	for ( i = 0; i < dtblsize; i++ ) {
		if( connections[i].c_struct_state != SLAP_C_USED ) {
			continue;
		}

		ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
141
142

		/* connections_mutex and c_mutex are locked */
143
144
		connection_closing( &connections[i] );
		connection_close( &connections[i] );
145

146
147
148
149
		ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
	}

	ldap_pvt_thread_mutex_unlock( &connections_mutex );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
150
151

	return 0;
152
153
}

154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
 * Timeout idle connections.
 */
int connections_timeout_idle(time_t now)
{
	int i = 0;
	int connindex;
	Connection* c;

	ldap_pvt_thread_mutex_lock( &connections_mutex );

 	for( c = connection_first( &connindex );
		c != NULL;
		c = connection_next( c, &connindex ) )
	{
		if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
			/* close it */
			connection_closing( c );
			connection_close( c );
			i++;
		}
	}
	connection_done( c );

	ldap_pvt_thread_mutex_unlock( &connections_mutex );

	return i;
}

183
static Connection* connection_get( ber_socket_t s )
184
{
185
186
	/* connections_mutex should be locked by caller */

187
188
189
	Connection *c;

	Debug( LDAP_DEBUG_ARGS,
190
191
		"connection_get(%ld)\n",
		(long) s, 0, 0 );
192
193
194

	assert( connections != NULL );

195
	if(s == AC_SOCKET_INVALID) {
196
197
198
199
200
		return NULL;
	}

#ifndef HAVE_WINSOCK
	c = &connections[s];
201

Kurt Zeilenga's avatar
Kurt Zeilenga committed
202
	assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
203

204
#else
205
	c = NULL;
206
	{
207
		ber_socket_t i;
208
209

		for(i=0; i<dtblsize; i++) {
Gary Williams's avatar
NT port    
Gary Williams committed
210
			if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
211
				assert( connections[i].c_conn_state == SLAP_C_INVALID );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
212
				assert( connections[i].c_sb == 0 );
213
214
215
				break;
			}

Gary Williams's avatar
NT port    
Gary Williams committed
216
			if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
217
				assert( connections[i].c_conn_state == SLAP_C_INVALID );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
218
				assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
219
220
221
				continue;
			}

222
223
224
			/* state can actually change from used -> unused by resched,
			 * so don't assert details here.
			 */
225

Kurt Zeilenga's avatar
Kurt Zeilenga committed
226
			if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
Gary Williams's avatar
NT port    
Gary Williams committed
227
				c = &connections[i];
228
229
230
231
232
				break;
			}
		}
	}
#endif
233

234
	if( c != NULL ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
235
236
		ldap_pvt_thread_mutex_lock( &c->c_mutex );

237
238
		if( c->c_struct_state != SLAP_C_USED ) {
			/* connection must have been closed due to resched */
239

240
241
242
243
244
245
246
			assert( c->c_conn_state == SLAP_C_INVALID );
			assert( !ber_pvt_sb_in_use( c->c_sb ) );

			Debug( LDAP_DEBUG_TRACE,
				"connection_get(%d): connection not used.\n",
				s, c->c_connid, 0 );

247
			ldap_pvt_thread_mutex_unlock( &c->c_mutex );
248
249
250
			return NULL;
		}

251
252
253
		Debug( LDAP_DEBUG_TRACE,
			"connection_get(%d): got connid=%ld\n",
			s, c->c_connid, 0 );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
254

255
256
		c->c_n_get++;

Kurt Zeilenga's avatar
Kurt Zeilenga committed
257
258
259
		assert( c->c_struct_state == SLAP_C_USED );
		assert( c->c_conn_state != SLAP_C_INVALID );
		assert( ber_pvt_sb_in_use( c->c_sb ) );
260
261

    	c->c_activitytime = slap_get_time();
262
	}
Kurt Zeilenga's avatar
Kurt Zeilenga committed
263

264
265
266
267
268
269
270
271
272
	return c;
}

static void connection_return( Connection *c )
{
	ldap_pvt_thread_mutex_unlock( &c->c_mutex );
}

long connection_init(
273
	ber_socket_t s,
Kurt Zeilenga's avatar
Kurt Zeilenga committed
274
275
276
277
	const char* url,
	const char* dnsname,
	const char* peername,
	const char* sockname,
Kurt Zeilenga's avatar
Kurt Zeilenga committed
278
	int use_tls )
279
{
280
	unsigned long id;
281
	Connection *c;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
282

283
284
	assert( connections != NULL );

Kurt Zeilenga's avatar
Kurt Zeilenga committed
285
286
287
288
	assert( dnsname != NULL );
	assert( peername != NULL );
	assert( sockname != NULL );

Kurt Zeilenga's avatar
Kurt Zeilenga committed
289
290
291
292
#ifndef HAVE_TLS
	assert( !use_tls );
#endif

293
	if( s == AC_SOCKET_INVALID ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
294
        Debug( LDAP_DEBUG_ANY,
295
296
			"connection_init(%ld): invalid.\n",
			(long) s, 0, 0 );
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
		return -1;
	}

	assert( s >= 0 );
#ifndef HAVE_WINSOCK
	assert( s < dtblsize );
#endif

	ldap_pvt_thread_mutex_lock( &connections_mutex );

#ifndef HAVE_WINSOCK
	c = &connections[s];

#else
	{
312
		unsigned int i;
313

314
315
		c = NULL;

Gary Williams's avatar
NT port    
Gary Williams committed
316
317
        for( i=0; i < dtblsize; i++) {
            if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
318
                assert( connections[i].c_sb == 0 );
Gary Williams's avatar
NT port    
Gary Williams committed
319
320
321
322
323
                c = &connections[i];
                break;
            }

            if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
324
                assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
Gary Williams's avatar
NT port    
Gary Williams committed
325
326
327
328
329
330
                c = &connections[i];
                break;
            }

            assert( connections[i].c_struct_state == SLAP_C_USED );
            assert( connections[i].c_conn_state != SLAP_C_INVALID );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
331
            assert( ber_pvt_sb_in_use( connections[i].c_sb ));
Gary Williams's avatar
NT port    
Gary Williams committed
332
333
334
        }

        if( c == NULL ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
335
336
337
        	Debug( LDAP_DEBUG_ANY,
				"connection_init(%d): connection table full (%d/%d).\n",
				s, i, dtblsize);
Gary Williams's avatar
NT port    
Gary Williams committed
338
339
340
341
            ldap_pvt_thread_mutex_unlock( &connections_mutex );
            return -1;
        }
    }
342
343
#endif

Gary Williams's avatar
NT port    
Gary Williams committed
344
345
346
    assert( c != NULL );
    assert( c->c_struct_state != SLAP_C_USED );
    assert( c->c_conn_state == SLAP_C_INVALID );
347

Gary Williams's avatar
NT port    
Gary Williams committed
348
349
350
    if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
        c->c_dn = NULL;
        c->c_cdn = NULL;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
351
352
353
354
355
356

		c->c_listener_url = NULL;
		c->c_peer_domain = NULL;
        c->c_peer_name = NULL;
        c->c_sock_name = NULL;

Gary Williams's avatar
NT port    
Gary Williams committed
357
358
        c->c_ops = NULL;
        c->c_pending_ops = NULL;
359
360
		c->c_authmech = NULL;
		c->c_authstate = NULL;
361

Kurt Zeilenga's avatar
Kurt Zeilenga committed
362
        c->c_sb = ber_sockbuf_alloc( );
363

Gary Williams's avatar
NT port    
Gary Williams committed
364
365
366
367
        /* should check status of thread calls */
        ldap_pvt_thread_mutex_init( &c->c_mutex );
        ldap_pvt_thread_mutex_init( &c->c_write_mutex );
        ldap_pvt_thread_cond_init( &c->c_write_cv );
368

Gary Williams's avatar
NT port    
Gary Williams committed
369
370
        c->c_struct_state = SLAP_C_UNUSED;
    }
371

Gary Williams's avatar
NT port    
Gary Williams committed
372
    ldap_pvt_thread_mutex_lock( &c->c_mutex );
373

Gary Williams's avatar
NT port    
Gary Williams committed
374
375
376
    assert( c->c_struct_state == SLAP_C_UNUSED );
    assert(	c->c_dn == NULL );
    assert(	c->c_cdn == NULL );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
377
378
379
380
    assert( c->c_listener_url == NULL );
    assert( c->c_peer_domain == NULL );
    assert( c->c_peer_name == NULL );
    assert( c->c_sock_name == NULL );
Gary Williams's avatar
NT port    
Gary Williams committed
381
382
    assert( c->c_ops == NULL );
    assert( c->c_pending_ops == NULL );
383
384
	assert( c->c_authmech == NULL );
	assert( c->c_authstate == NULL );
385

Kurt Zeilenga's avatar
Kurt Zeilenga committed
386
387
388
389
	c->c_listener_url = ch_strdup( url  );
	c->c_peer_domain = ch_strdup( dnsname  );
    c->c_peer_name = ch_strdup( peername  );
    c->c_sock_name = ch_strdup( sockname );
390

Gary Williams's avatar
NT port    
Gary Williams committed
391
392
393
394
    c->c_n_ops_received = 0;
    c->c_n_ops_executing = 0;
    c->c_n_ops_pending = 0;
    c->c_n_ops_completed = 0;
395
396
397
398

	c->c_n_get = 0;
	c->c_n_read = 0;
	c->c_n_write = 0;
399

400
    c->c_activitytime = c->c_starttime = slap_get_time();
401

Kurt Zeilenga's avatar
Kurt Zeilenga committed
402
403
    ber_pvt_sb_set_desc( c->c_sb, s );
    ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
404

Kurt Zeilenga's avatar
Kurt Zeilenga committed
405
    if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
Gary Williams's avatar
NT port    
Gary Williams committed
406
        Debug( LDAP_DEBUG_ANY,
Kurt Zeilenga's avatar
Kurt Zeilenga committed
407
408
            "connection_init(%d, %s): set nonblocking failed\n",
            s, c->c_peer_name,0 );
Gary Williams's avatar
NT port    
Gary Williams committed
409
    }
410

Gary Williams's avatar
NT port    
Gary Williams committed
411
    id = c->c_connid = conn_nextid++;
412

Gary Williams's avatar
NT port    
Gary Williams committed
413
414
    c->c_conn_state = SLAP_C_INACTIVE;
    c->c_struct_state = SLAP_C_USED;
415

Kurt Zeilenga's avatar
Kurt Zeilenga committed
416
#ifdef HAVE_TLS
417
    if ( use_tls ) {
418
419
	    c->c_is_tls = 1;
	    c->c_needs_tls_accept = 1;
420
    }
Kurt Zeilenga's avatar
Kurt Zeilenga committed
421
#endif
422

Gary Williams's avatar
NT port    
Gary Williams committed
423
424
    ldap_pvt_thread_mutex_unlock( &c->c_mutex );
    ldap_pvt_thread_mutex_unlock( &connections_mutex );
425

426
427
    backend_connection_init(c);

Gary Williams's avatar
NT port    
Gary Williams committed
428
    return id;
429
430
431
432
433
}

static void
connection_destroy( Connection *c )
{
434
435
	/* note: connections_mutex should be locked by caller */

Gary Williams's avatar
NT port    
Gary Williams committed
436
437
438
439
440
    assert( connections != NULL );
    assert( c != NULL );
    assert( c->c_struct_state != SLAP_C_UNUSED );
    assert( c->c_conn_state != SLAP_C_INVALID );
    assert( c->c_ops == NULL );
441

442
443
    backend_connection_destroy(c);

Gary Williams's avatar
NT port    
Gary Williams committed
444
    c->c_protocol = 0;
445
    c->c_connid = -1;
446

447
    c->c_activitytime = c->c_starttime = 0;
448

Gary Williams's avatar
NT port    
Gary Williams committed
449
450
451
452
    if(c->c_dn != NULL) {
        free(c->c_dn);
        c->c_dn = NULL;
    }
453
454
455
456
	if(c->c_cdn != NULL) {
		free(c->c_cdn);
		c->c_cdn = NULL;
	}
Kurt Zeilenga's avatar
Kurt Zeilenga committed
457
458
459
460
461
462
463
464
465
466
467
	if(c->c_listener_url != NULL) {
		free(c->c_listener_url);
		c->c_listener_url = NULL;
	}
	if(c->c_peer_domain != NULL) {
		free(c->c_peer_domain);
		c->c_peer_domain = NULL;
	}
	if(c->c_peer_name != NULL) {
		free(c->c_peer_name);
		c->c_peer_name = NULL;
468
	}
Kurt Zeilenga's avatar
Kurt Zeilenga committed
469
470
471
	if(c->c_sock_name != NULL) {
		free(c->c_sock_name);
		c->c_sock_name = NULL;
472
	}
473
474
475
476
477
478
479
480
	if(c->c_authmech != NULL ) {
		free(c->c_authmech);
		c->c_authmech = NULL;
	}
	if(c->c_authstate != NULL ) {
		free(c->c_authstate);
		c->c_authstate = NULL;
	}
481

Kurt Zeilenga's avatar
Kurt Zeilenga committed
482
483
	if ( ber_pvt_sb_in_use(c->c_sb) ) {
		int sd = ber_pvt_sb_get_desc(c->c_sb);
484

485
		slapd_remove( sd, 0 );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
486
	   	ber_pvt_sb_close( c->c_sb );
487
488
489
490
491
492

		Statslog( LDAP_DEBUG_STATS,
		    "conn=%d fd=%d closed.\n",
			c->c_connid, sd, 0, 0, 0 );
	}

Kurt Zeilenga's avatar
Kurt Zeilenga committed
493
   	ber_pvt_sb_destroy( c->c_sb );
494
495
496

    c->c_conn_state = SLAP_C_INVALID;
    c->c_struct_state = SLAP_C_UNUSED;
497
498
}

499
500
int connection_state_closing( Connection *c )
{
501
502
	/* c_mutex must be locked by caller */

503
	int state;
504
505
506
	assert( c != NULL );
	assert( c->c_struct_state == SLAP_C_USED );

507
508
509
510
511
	state = c->c_conn_state;

	assert( state != SLAP_C_INVALID );

	return state == SLAP_C_CLOSING;
512
513
}

514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
static void connection_abandon( Connection *c )
{
	/* c_mutex must be locked by caller */

	Operation *o;

	for( o = c->c_ops; o != NULL; o = o->o_next ) {
		ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
		o->o_abandon = 1;
		ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
	}

	/* remove pending operations */
	for( o = slap_op_pop( &c->c_pending_ops );
		o != NULL;
		o = slap_op_pop( &c->c_pending_ops ) )
	{
		slap_op_free( o );
	}
}

535
536
537
538
539
540
541
void connection_closing( Connection *c )
{
	assert( connections != NULL );
	assert( c != NULL );
	assert( c->c_struct_state == SLAP_C_USED );
	assert( c->c_conn_state != SLAP_C_INVALID );

542
543
	/* c_mutex must be locked by caller */

544
	if( c->c_conn_state != SLAP_C_CLOSING ) {
545
546
547

		Debug( LDAP_DEBUG_TRACE,
			"connection_closing: readying conn=%ld sd=%d for close.\n",
Kurt Zeilenga's avatar
Kurt Zeilenga committed
548
			c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
549

Kurt Zeilenga's avatar
Kurt Zeilenga committed
550
551
552
		/* update state to closing */
		c->c_conn_state = SLAP_C_CLOSING;

553
		/* don't listen on this port anymore */
Kurt Zeilenga's avatar
Kurt Zeilenga committed
554
		slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
555
556
557
558

		/* shutdown I/O -- not yet implemented */

		/* abandon active operations */
559
		connection_abandon( c );
560
561

		/* wake write blocked operations */
Kurt Zeilenga's avatar
Kurt Zeilenga committed
562
		slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
563
		ldap_pvt_thread_cond_signal( &c->c_write_cv );
564
565
566
	}
}

567
568
569
570
571
572
573
static void connection_close( Connection *c )
{
	assert( connections != NULL );
	assert( c != NULL );
	assert( c->c_struct_state == SLAP_C_USED );
	assert( c->c_conn_state == SLAP_C_CLOSING );

574
	/* note: connections_mutex and c_mutex should be locked by caller */
575

576
577
578
	if( c->c_ops != NULL ) {
		Debug( LDAP_DEBUG_TRACE,
			"connection_close: deferring conn=%ld sd=%d.\n",
Kurt Zeilenga's avatar
Kurt Zeilenga committed
579
			c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
580
581
582
583
584

		return;
	}

	Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
Kurt Zeilenga's avatar
Kurt Zeilenga committed
585
		c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
586
587
588
589

	connection_destroy( c );
}

590
unsigned long connections_nextid(void)
591
{
592
	unsigned long id;
593
594
595
596
597
598
599
600
601
602
603
	assert( connections != NULL );

	ldap_pvt_thread_mutex_lock( &connections_mutex );

	id = conn_nextid;

	ldap_pvt_thread_mutex_unlock( &connections_mutex );

	return id;
}

604
Connection* connection_first( ber_socket_t *index )
605
606
{
	assert( connections != NULL );
607
	assert( index != NULL );
608
609
610

	ldap_pvt_thread_mutex_lock( &connections_mutex );

611
	*index = 0;
612

613
	return connection_next(NULL, index);
614
615
}

616
Connection* connection_next( Connection *c, ber_socket_t *index )
617
618
{
	assert( connections != NULL );
619
620
	assert( index != NULL );
	assert( *index <= dtblsize );
621
622
623
624
625
626
627

	if( c != NULL ) {
		ldap_pvt_thread_mutex_unlock( &c->c_mutex );
	}

	c = NULL;

628
629
630
	for(; *index < dtblsize; (*index)++) {
		if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
			assert( connections[*index].c_conn_state == SLAP_C_INVALID );
631
632
633
634
635
636
637
#ifndef HAVE_WINSOCK
			continue;
#else
			break;
#endif
		}

638
639
640
		if( connections[*index].c_struct_state == SLAP_C_USED ) {
			assert( connections[*index].c_conn_state != SLAP_C_INVALID );
			c = &connections[(*index)++];
641
642
643
			break;
		}

644
645
		assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
		assert( connections[*index].c_conn_state == SLAP_C_INVALID );
646
647
648
649
650
651
652
653
654
	}

	if( c != NULL ) {
		ldap_pvt_thread_mutex_lock( &c->c_mutex );
	}

	return c;
}

655
void connection_done( Connection *c )
656
657
658
659
660
661
662
663
664
665
{
	assert( connections != NULL );

	if( c != NULL ) {
		ldap_pvt_thread_mutex_unlock( &c->c_mutex );
	}

	ldap_pvt_thread_mutex_unlock( &connections_mutex );
}

Kurt Zeilenga's avatar
Kurt Zeilenga committed
666
667
668
669
670
671
/*
 * connection_activity - handle the request operation op on connection
 * conn.  This routine figures out what kind of operation it is and
 * calls the appropriate stub to handle it.
 */

672
673
static void *
connection_operation( void *arg_v )
Kurt Zeilenga's avatar
Kurt Zeilenga committed
674
{
675
	int rc;
676
	struct co_arg	*arg = arg_v;
677
	ber_tag_t tag = arg->co_op->o_tag;
678
	Connection *conn = arg->co_conn;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
679

Kurt Zeilenga's avatar
Kurt Zeilenga committed
680
681
682
	ldap_pvt_thread_mutex_lock( &num_ops_mutex );
	num_ops_initiated++;
	ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
683

684
	switch ( tag ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
685
	case LDAP_REQ_BIND:
686
		rc = do_bind( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
687
688
689
		break;

	case LDAP_REQ_UNBIND:
690
		rc = do_unbind( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
691
692
693
		break;

	case LDAP_REQ_ADD:
694
		rc = do_add( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
695
696
697
		break;

	case LDAP_REQ_DELETE:
698
		rc = do_delete( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
699
700
701
		break;

	case LDAP_REQ_MODRDN:
702
		rc = do_modrdn( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
703
704
705
		break;

	case LDAP_REQ_MODIFY:
706
		rc = do_modify( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
707
708
709
		break;

	case LDAP_REQ_COMPARE:
710
		rc = do_compare( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
711
712
713
		break;

	case LDAP_REQ_SEARCH:
714
		rc = do_search( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
715
716
717
		break;

	case LDAP_REQ_ABANDON:
718
		rc = do_abandon( conn, arg->co_op );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
719
720
		break;

721
	case LDAP_REQ_EXTENDED:
722
		rc = do_extended( conn, arg->co_op );
723
724
		break;

Kurt Zeilenga's avatar
Kurt Zeilenga committed
725
	default:
726
727
728
729
730
731
		Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
		    tag, 0, 0 );
		arg->co_op->o_tag = LBER_ERROR;
		send_ldap_disconnect( conn, arg->co_op,
			LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
		rc = -1;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
732
733
734
		break;
	}

735
736
	if( rc == -1 ) tag = LBER_ERROR;

Kurt Zeilenga's avatar
Kurt Zeilenga committed
737
738
739
	ldap_pvt_thread_mutex_lock( &num_ops_mutex );
	num_ops_completed++;
	ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
740
741

	ldap_pvt_thread_mutex_lock( &conn->c_mutex );
742

743
	conn->c_n_ops_executing--;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
744
	conn->c_n_ops_completed++;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
745

746
747
748
	slap_op_remove( &conn->c_ops, arg->co_op );
	slap_op_free( arg->co_op );
	arg->co_op = NULL;
749
	arg->co_conn = NULL;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
750
	free( (char *) arg );
751
	arg = NULL;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
752

753
	switch( tag ) {
754
	case LBER_ERROR:
755
	case LDAP_REQ_UNBIND:
756
		/* c_mutex is locked */
757
		connection_closing( conn );
758
759
760
761
762
763
		break;

	case LDAP_REQ_BIND:
		if( conn->c_conn_state == SLAP_C_BINDING) {
			conn->c_conn_state = SLAP_C_ACTIVE;
		}
764
		conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
765
766
	}

767
	ldap_pvt_thread_mutex_lock( &active_threads_mutex );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
768
	active_threads--;
769
	if( active_threads < 1 ) {
770
		ldap_pvt_thread_cond_signal(&active_threads_cond);
771
	}
772
	ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
773
774
775

	connection_resched( conn );

776
777
	ldap_pvt_thread_mutex_unlock( &conn->c_mutex );

778
	return NULL;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
779
780
}

781
int connection_read(ber_socket_t s)
782
783
784
785
786
787
788
{
	int rc = 0;
	Connection *c;
	assert( connections != NULL );

	ldap_pvt_thread_mutex_lock( &connections_mutex );

789
	/* get (locked) connection */
790
	c = connection_get( s );
791

792
793
	if( c == NULL ) {
		Debug( LDAP_DEBUG_ANY,
794
795
			"connection_read(%ld): no connection!\n",
			(long) s, 0, 0 );
796
797
798

		slapd_remove(s, 0);

799
		ldap_pvt_thread_mutex_unlock( &connections_mutex );
800
801
802
		return -1;
	}

803
804
	c->c_n_read++;

805
806
807
808
809
810
811
812
813
814
	if( c->c_conn_state == SLAP_C_CLOSING ) {
		Debug( LDAP_DEBUG_TRACE,
			"connection_read(%d): closing, ignoring input for id=%ld\n",
			s, c->c_connid, 0 );

		connection_return( c );
		ldap_pvt_thread_mutex_unlock( &connections_mutex );
		return 0;
	}

815
816
817
818
	Debug( LDAP_DEBUG_TRACE,
		"connection_read(%d): checking for input on id=%ld\n",
		s, c->c_connid, 0 );

819
820
821
822
823
824
825
826
#ifdef HAVE_TLS
	if ( c->c_is_tls && c->c_needs_tls_accept ) {
		rc = ldap_pvt_tls_accept( c->c_sb, NULL );
		if ( rc < 0 ) {
			Debug( LDAP_DEBUG_TRACE,
			       "connection_read(%d): TLS accept error error=%d id=%ld, closing.\n",
			       s, rc, c->c_connid );

827
			c->c_needs_tls_accept = 0;
828
829
830
831
832
833
834
835
836
837
838
839
			/* connections_mutex and c_mutex are locked */
			connection_closing( c );
			connection_close( c );
		} else if ( rc == 0 ) {
			c->c_needs_tls_accept = 0;
		}
		connection_return( c );
		ldap_pvt_thread_mutex_unlock( &connections_mutex );
		return 0;
	}
#endif

840
841
842
#define CONNECTION_INPUT_LOOP 1

#ifdef DATA_READY_LOOP
Julio Sánchez Fernández's avatar
   
Julio Sánchez Fernández committed
843
	while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
844
#elif CONNECTION_INPUT_LOOP
Julio Sánchez Fernández's avatar
   
Julio Sánchez Fernández committed
845
	while(!rc)
846
847
#endif
	{
Julio Sánchez Fernández's avatar
   
Julio Sánchez Fernández committed
848
		/* How do we do this without getting into a busy loop ? */
849
850
851
852
853
		rc = connection_input( c );
	}

	if( rc < 0 ) {
		Debug( LDAP_DEBUG_TRACE,
854
855
			"connection_read(%d): input error=%d id=%ld, closing.\n",
			s, rc, c->c_connid );
856

857
		/* connections_mutex and c_mutex are locked */
858
		connection_closing( c );
859
860
861
		connection_close( c );
	}

862
863
864
865
	if ( ber_pvt_sb_needs_read( c->c_sb ) )
		slapd_set_read( s, 1 );
	if ( ber_pvt_sb_needs_write( c->c_sb ) )
		slapd_set_write( s, 1 );
866
867
868
869
870
871
872
	connection_return( c );
	ldap_pvt_thread_mutex_unlock( &connections_mutex );
	return 0;
}

static int
connection_input(
Kurt Zeilenga's avatar
Kurt Zeilenga committed
873
874
875
    Connection *conn
)
{
876
	Operation *op;
877
878
879
	ber_tag_t	tag;
	ber_len_t	len;
	ber_int_t	msgid;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
880
881
882
883
884
	BerElement	*ber;

	if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
	    == NULL ) {
		Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
885
		return -1;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
886
887
888
	}

	errno = 0;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
889
	if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
890
891
	    != LDAP_TAG_MESSAGE )
	{
892
893
		int err = errno;

Kurt Zeilenga's avatar
Kurt Zeilenga committed
894
		Debug( LDAP_DEBUG_TRACE,
895
			"ber_get_next on fd %d failed errno %d (%s)\n",
Kurt Zeilenga's avatar
Kurt Zeilenga committed
896
			ber_pvt_sb_get_desc( conn->c_sb ), err,
897
			err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
898
899
		Debug( LDAP_DEBUG_TRACE,
			"\t*** got %ld of %lu so far\n",
900
901
			(long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
			conn->c_currentber->ber_len, 0 );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
902

903
		if ( err != EWOULDBLOCK && err != EAGAIN ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
904
905
906
907
			/* log, close and send error */
			ber_free( conn->c_currentber, 1 );
			conn->c_currentber = NULL;

908
			return -2;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
909
		}
910
		return 1;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
911
	}
912

Kurt Zeilenga's avatar
Kurt Zeilenga committed
913
914
915
916
917
	ber = conn->c_currentber;
	conn->c_currentber = NULL;

	if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
		/* log, close and send error */
918
		Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
Kurt Zeilenga's avatar
Kurt Zeilenga committed
919
920
		    0 );
		ber_free( ber, 1 );
921
		return -1;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
922
923
924
925
	}

	if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
		/* log, close and send error */
926
		Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
Kurt Zeilenga's avatar
Kurt Zeilenga committed
927
928
929
		    0 );
		ber_free( ber, 1 );

930
		return -1;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
931
932
	}

933
934
935
936
937
	if(tag == LDAP_REQ_BIND) {
		/* immediately abandon all exiting operations upon BIND */
		connection_abandon( conn );
	}

938
	op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
939

940
941
942
	if ( conn->c_conn_state == SLAP_C_BINDING
		|| conn->c_conn_state == SLAP_C_CLOSING )
	{
943
		Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
944
		conn->c_n_ops_pending++;
945
		slap_op_add( &conn->c_pending_ops, op );
946

947
	} else {
948
		conn->c_n_ops_executing++;
949
950
		connection_op_activate( conn, op );
	}
951

952
953
954
955
#ifdef NO_THREADS
	if ( conn->c_struct_state != SLAP_C_USED ) {
		/* connection must have got closed underneath us */
		return 1;
956
	}
957
958
#endif
	assert( conn->c_struct_state == SLAP_C_USED );
959

960
	return 0;
961
962
963
964
965
966
967
}

static int
connection_resched( Connection *conn )
{
	Operation *op;

968
969
970
971
972
973
974
975
976
	if( conn->c_conn_state == SLAP_C_CLOSING ) {
		Debug( LDAP_DEBUG_TRACE,
			"connection_resched: attempting closing conn=%ld sd=%d.\n",
			conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );

		connection_close( conn );
		return 0;
	}

977
	if( conn->c_conn_state != SLAP_C_ACTIVE ) {
978
		/* other states need different handling */
Gary Williams's avatar
NT port    
Gary Williams committed
979
		return 0;
980
981
982
983
984
985
	}

	for( op = slap_op_pop( &conn->c_pending_ops );
		op != NULL;
		op = slap_op_pop( &conn->c_pending_ops ) )
	{
986
987
988
		/* pending operations should not be marked for abandonment */
		assert(!op->o_abandon);

989
990
991
		conn->c_n_ops_pending--;
		conn->c_n_ops_executing++;

992
993
		connection_op_activate( conn, op );

994
		if ( conn->c_conn_state == SLAP_C_BINDING ) {
995
996
997
			break;
		}
	}
Gary Williams's avatar
NT port    
Gary Williams committed
998
	return 0;
999
1000
1001
1002
1003
1004
1005
}

static int connection_op_activate( Connection *conn, Operation *op )
{
	struct co_arg *arg;
	char *tmpdn;
	int status;
1006
	ber_tag_t tag = op->o_tag;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
1007

1008
1009
1010
1011
	if(tag == LDAP_REQ_BIND) {
		conn->c_conn_state = SLAP_C_BINDING;
	}

Kurt Zeilenga's avatar
Kurt Zeilenga committed
1012
	if ( conn->c_dn != NULL ) {
1013
		tmpdn = ch_strdup( conn->c_dn );
Kurt Zeilenga's avatar
Kurt Zeilenga committed
1014
1015
1016
1017
	} else {
		tmpdn = NULL;
	}

1018
1019
1020
1021
	arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
	arg->co_conn = conn;
	arg->co_op = op;

1022
1023
	arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;

1024
	arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1025
1026
	arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
	(void) dn_normalize_case( arg->co_op->o_ndn );
1027

1028
	arg->co_op->o_protocol = conn->c_protocol;
1029
	arg->co_op->o_connid = conn->c_connid;
1030

1031
	arg->co_op->o_authtype = conn->c_authtype;
1032
1033
	arg->co_op->o_authmech = conn->c_authmech != NULL
		?  ch_strdup( conn->c_authmech ) : NULL;
1034
	
1035
1036
	slap_op_add( &conn->c_ops, arg->co_op );

1037
	if( tmpdn != NULL ) {
Kurt Zeilenga's avatar
Kurt Zeilenga committed
1038
1039
1040
		free( tmpdn );
	}

1041
1042
1043
1044
	ldap_pvt_thread_mutex_lock( &active_threads_mutex );
	active_threads++;
	ldap_pvt_thread_mutex_unlock( &active_threads_mutex );

1045
1046
	status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
					 connection_operation, (void *) arg );
1047

1048
	if ( status != 0 ) {
1049
1050
1051
1052
		Debug( LDAP_DEBUG_ANY,
		"ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );

		/* should move op to pending list */
Kurt Zeilenga's avatar
Kurt Zeilenga committed
1053
	}
1054
1055

	return status;
Kurt Zeilenga's avatar
Kurt Zeilenga committed
1056
}
1057

1058
int connection_write(ber_socket_t s)
1059
1060
1061
1062
1063
1064
1065
{
	Connection *c;
	assert( connections != NULL );

	ldap_pvt_thread_mutex_lock( &connections_mutex