git.sur5r.net Git - openldap/blob - servers/slapd/connection.c

   1 /*
   2  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   3  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   4  */
   5
   6 #include "portable.h"
   7
   8 #include <stdio.h>
   9
  10 #include <ac/socket.h>
  11 #include <ac/errno.h>
  12 #include <ac/signal.h>
  13 #include <ac/string.h>
  14 #include <ac/time.h>
  15
  16 #include "slap.h"
  17
  18 /* we need LBER internals */
  19 #include "../../libraries/liblber/lber-int.h"
  20
  21 /* protected by connections_mutex */
  22 static ldap_pvt_thread_mutex_t connections_mutex;
  23 static Connection *connections = NULL;
  24 static unsigned long conn_nextid = 0;
  25
  26 /* structure state (protected by connections_mutex) */
  27 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  28 #define SLAP_C_UNUSED                   0x01
  29 #define SLAP_C_USED                             0x02
  30
  31 /* connection state (protected by c_mutex ) */
  32 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  33 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  34 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  35 #define SLAP_C_BINDING                  0x03    /* binding */
  36 #define SLAP_C_CLOSING                  0x04    /* closing */
  37
  38 const char *
  39 connection_state2str( int state )
  40 {
  41         switch( state ) {
  42         case SLAP_C_INVALID:    return "!";
  43         case SLAP_C_INACTIVE:   return "|";
  44         case SLAP_C_ACTIVE:             return "";
  45         case SLAP_C_BINDING:    return "B";
  46         case SLAP_C_CLOSING:    return "C";
  47         }
  48
  49         return "?";
  50 }
  51
  52 static Connection* connection_get( ber_socket_t s );
  53
  54 static int connection_input( Connection *c );
  55 static void connection_close( Connection *c );
  56
  57 static int connection_op_activate( Connection *conn, Operation *op );
  58 static int connection_resched( Connection *conn );
  59 static void connection_abandon( Connection *conn );
  60 static void connection_destroy( Connection *c );
  61
  62 struct co_arg {
  63         Connection      *co_conn;
  64         Operation       *co_op;
  65 };
  66
  67 /*
  68  * Initialize connection management infrastructure.
  69  */
  70 int connections_init(void)
  71 {
  72         assert( connections == NULL );
  73
  74         if( connections != NULL) {
  75                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  76                         0, 0, 0 );
  77                 return -1;
  78         }
  79
  80         /* should check return of every call */
  81         ldap_pvt_thread_mutex_init( &connections_mutex );
  82
  83         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  84
  85         if( connections == NULL ) {
  86                 Debug( LDAP_DEBUG_ANY,
  87                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  88                         dtblsize, (long) sizeof(Connection), 0 );
  89                 return -1;
  90         }
  91
  92     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  93     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  94
  95         /*
  96          * per entry initialization of the Connection array initialization
  97          * will be done by connection_init()
  98          */
  99
 100         return 0;
 101 }
 102
 103 /*
 104  * Destroy connection management infrastructure.
 105  */
 106 int connections_destroy(void)
 107 {
 108         ber_socket_t i;
 109
 110         /* should check return of every call */
 111
 112         if( connections == NULL) {
 113                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 114                         0, 0, 0 );
 115                 return -1;
 116         }
 117
 118         for ( i = 0; i < dtblsize; i++ ) {
 119                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 120                         ber_sockbuf_free( connections[i].c_sb );
 121                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 122                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 123                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 124                 }
 125         }
 126
 127         free( connections );
 128         connections = NULL;
 129
 130         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 131         return 0;
 132 }
 133
 134 /*
 135  * shutdown all connections
 136  */
 137 int connections_shutdown(void)
 138 {
 139         ber_socket_t i;
 140
 141         ldap_pvt_thread_mutex_lock( &connections_mutex );
 142
 143         for ( i = 0; i < dtblsize; i++ ) {
 144                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 145                         continue;
 146                 }
 147
 148                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 149
 150                 /* connections_mutex and c_mutex are locked */
 151                 connection_closing( &connections[i] );
 152                 connection_close( &connections[i] );
 153
 154                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 155         }
 156
 157         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 158
 159         return 0;
 160 }
 161
 162 /*
 163  * Timeout idle connections.
 164  */
 165 int connections_timeout_idle(time_t now)
 166 {
 167         int i = 0;
 168         int connindex;
 169         Connection* c;
 170
 171         ldap_pvt_thread_mutex_lock( &connections_mutex );
 172
 173         for( c = connection_first( &connindex );
 174                 c != NULL;
 175                 c = connection_next( c, &connindex ) )
 176         {
 177                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 178                         /* close it */
 179                         connection_closing( c );
 180                         connection_close( c );
 181                         i++;
 182                 }
 183         }
 184         connection_done( c );
 185
 186         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 187
 188         return i;
 189 }
 190
 191 static Connection* connection_get( ber_socket_t s )
 192 {
 193         /* connections_mutex should be locked by caller */
 194
 195         Connection *c;
 196
 197         Debug( LDAP_DEBUG_ARGS,
 198                 "connection_get(%ld)\n",
 199                 (long) s, 0, 0 );
 200
 201         assert( connections != NULL );
 202
 203         if(s == AC_SOCKET_INVALID) {
 204                 return NULL;
 205         }
 206
 207 #ifndef HAVE_WINSOCK
 208         c = &connections[s];
 209
 210         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 211
 212 #else
 213         c = NULL;
 214         {
 215                 ber_socket_t i;
 216
 217                 for(i=0; i<dtblsize; i++) {
 218                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 219                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 220                                 assert( connections[i].c_sb == 0 );
 221                                 break;
 222                         }
 223
 224                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 225                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 226                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 227                                 continue;
 228                         }
 229
 230                         /* state can actually change from used -> unused by resched,
 231                          * so don't assert details here.
 232                          */
 233
 234                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 235                                 c = &connections[i];
 236                                 break;
 237                         }
 238                 }
 239         }
 240 #endif
 241
 242         if( c != NULL ) {
 243                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 244
 245                 if( c->c_struct_state != SLAP_C_USED ) {
 246                         /* connection must have been closed due to resched */
 247
 248                         assert( c->c_conn_state == SLAP_C_INVALID );
 249                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 250
 251                         Debug( LDAP_DEBUG_TRACE,
 252                                 "connection_get(%d): connection not used\n",
 253                                 s, 0, 0 );
 254
 255                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 256                         return NULL;
 257                 }
 258
 259                 Debug( LDAP_DEBUG_TRACE,
 260                         "connection_get(%d): got connid=%ld\n",
 261                         s, c->c_connid, 0 );
 262
 263                 c->c_n_get++;
 264
 265                 assert( c->c_struct_state == SLAP_C_USED );
 266                 assert( c->c_conn_state != SLAP_C_INVALID );
 267                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 268
 269         c->c_activitytime = slap_get_time();
 270         }
 271
 272         return c;
 273 }
 274
 275 static void connection_return( Connection *c )
 276 {
 277         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 278 }
 279
 280 long connection_init(
 281         ber_socket_t s,
 282         const char* url,
 283         const char* dnsname,
 284         const char* peername,
 285         const char* sockname,
 286         int use_tls )
 287 {
 288         unsigned long id;
 289         Connection *c;
 290
 291         assert( connections != NULL );
 292
 293         assert( dnsname != NULL );
 294         assert( peername != NULL );
 295         assert( sockname != NULL );
 296
 297 #ifndef HAVE_TLS
 298         assert( !use_tls );
 299 #endif
 300
 301         if( s == AC_SOCKET_INVALID ) {
 302         Debug( LDAP_DEBUG_ANY,
 303                         "connection_init(%ld): invalid.\n",
 304                         (long) s, 0, 0 );
 305                 return -1;
 306         }
 307
 308         assert( s >= 0 );
 309 #ifndef HAVE_WINSOCK
 310         assert( s < dtblsize );
 311 #endif
 312
 313         ldap_pvt_thread_mutex_lock( &connections_mutex );
 314
 315 #ifndef HAVE_WINSOCK
 316         c = &connections[s];
 317
 318 #else
 319         {
 320                 unsigned int i;
 321
 322                 c = NULL;
 323
 324         for( i=0; i < dtblsize; i++) {
 325             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 326                 assert( connections[i].c_sb == 0 );
 327                 c = &connections[i];
 328                 break;
 329             }
 330
 331             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 332                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 333                 c = &connections[i];
 334                 break;
 335             }
 336
 337             assert( connections[i].c_struct_state == SLAP_C_USED );
 338             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 339             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 340         }
 341
 342         if( c == NULL ) {
 343                 Debug( LDAP_DEBUG_ANY,
 344                                 "connection_init(%d): connection table full (%d/%d)\n",
 345                                 s, i, dtblsize);
 346             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 347             return -1;
 348         }
 349     }
 350 #endif
 351
 352     assert( c != NULL );
 353
 354     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 355         c->c_dn = NULL;
 356         c->c_cdn = NULL;
 357
 358                 c->c_listener_url = NULL;
 359                 c->c_peer_domain = NULL;
 360         c->c_peer_name = NULL;
 361         c->c_sock_name = NULL;
 362
 363         c->c_ops = NULL;
 364         c->c_pending_ops = NULL;
 365                 c->c_authmech = NULL;
 366                 c->c_authstate = NULL;
 367
 368 #ifdef HAVE_CYRUS_SASL
 369                 c->c_sasl_context = NULL;
 370 #endif
 371
 372         c->c_sb = ber_sockbuf_alloc( );
 373                 c->c_currentber = NULL;
 374
 375         /* should check status of thread calls */
 376         ldap_pvt_thread_mutex_init( &c->c_mutex );
 377         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 378         ldap_pvt_thread_cond_init( &c->c_write_cv );
 379
 380         c->c_struct_state = SLAP_C_UNUSED;
 381     }
 382
 383     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 384
 385     assert( c->c_struct_state == SLAP_C_UNUSED );
 386     assert(     c->c_dn == NULL );
 387     assert(     c->c_cdn == NULL );
 388     assert( c->c_listener_url == NULL );
 389     assert( c->c_peer_domain == NULL );
 390     assert( c->c_peer_name == NULL );
 391     assert( c->c_sock_name == NULL );
 392     assert( c->c_ops == NULL );
 393     assert( c->c_pending_ops == NULL );
 394         assert( c->c_authmech == NULL );
 395         assert( c->c_authstate == NULL );
 396 #ifdef HAVE_CYRUS_SASL
 397         assert( c->c_sasl_context == NULL );
 398 #endif
 399         assert( c->c_currentber == NULL );
 400
 401         c->c_listener_url = ch_strdup( url  );
 402         c->c_peer_domain = ch_strdup( dnsname  );
 403     c->c_peer_name = ch_strdup( peername  );
 404     c->c_sock_name = ch_strdup( sockname );
 405
 406     c->c_n_ops_received = 0;
 407     c->c_n_ops_executing = 0;
 408     c->c_n_ops_pending = 0;
 409     c->c_n_ops_completed = 0;
 410
 411         c->c_n_get = 0;
 412         c->c_n_read = 0;
 413         c->c_n_write = 0;
 414
 415         /* assume LDAPv3 until bind */
 416         c->c_protocol = LDAP_VERSION3;
 417
 418     c->c_activitytime = c->c_starttime = slap_get_time();
 419
 420     ber_pvt_sb_set_desc( c->c_sb, s );
 421     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 422
 423     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 424         Debug( LDAP_DEBUG_ANY,
 425             "connection_init(%d, %s): set nonblocking failed\n",
 426             s, c->c_peer_name,0 );
 427     }
 428
 429     id = c->c_connid = conn_nextid++;
 430
 431     c->c_conn_state = SLAP_C_INACTIVE;
 432     c->c_struct_state = SLAP_C_USED;
 433
 434 #ifdef HAVE_TLS
 435     if ( use_tls ) {
 436             c->c_is_tls = 1;
 437             c->c_needs_tls_accept = 1;
 438     }
 439 #endif
 440
 441     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 442     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 443
 444     backend_connection_init(c);
 445
 446     return id;
 447 }
 448
 449 static void
 450 connection_destroy( Connection *c )
 451 {
 452         /* note: connections_mutex should be locked by caller */
 453
 454     assert( connections != NULL );
 455     assert( c != NULL );
 456     assert( c->c_struct_state != SLAP_C_UNUSED );
 457     assert( c->c_conn_state != SLAP_C_INVALID );
 458     assert( c->c_ops == NULL );
 459
 460     backend_connection_destroy(c);
 461
 462     c->c_protocol = 0;
 463     c->c_connid = -1;
 464
 465     c->c_activitytime = c->c_starttime = 0;
 466
 467     if(c->c_dn != NULL) {
 468         free(c->c_dn);
 469         c->c_dn = NULL;
 470     }
 471         if(c->c_cdn != NULL) {
 472                 free(c->c_cdn);
 473                 c->c_cdn = NULL;
 474         }
 475         if(c->c_listener_url != NULL) {
 476                 free(c->c_listener_url);
 477                 c->c_listener_url = NULL;
 478         }
 479         if(c->c_peer_domain != NULL) {
 480                 free(c->c_peer_domain);
 481                 c->c_peer_domain = NULL;
 482         }
 483         if(c->c_peer_name != NULL) {
 484                 free(c->c_peer_name);
 485                 c->c_peer_name = NULL;
 486         }
 487         if(c->c_sock_name != NULL) {
 488                 free(c->c_sock_name);
 489                 c->c_sock_name = NULL;
 490         }
 491         if(c->c_authmech != NULL ) {
 492                 free(c->c_authmech);
 493                 c->c_authmech = NULL;
 494         }
 495         if(c->c_authstate != NULL ) {
 496                 free(c->c_authstate);
 497                 c->c_authstate = NULL;
 498         }
 499
 500 #ifdef HAVE_CYRUS_SASL
 501         if(c->c_sasl_context != NULL ) {
 502                 sasl_dispose( &c->c_sasl_context );
 503                 c->c_sasl_context = NULL;
 504         }
 505 #endif
 506
 507         if ( c->c_currentber != NULL ) {
 508                 ber_free( c->c_currentber, 1 );
 509                 c->c_currentber = NULL;
 510         }
 511
 512         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 513                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 514
 515                 slapd_remove( sd, 0 );
 516                 ber_pvt_sb_close( c->c_sb );
 517
 518                 Statslog( LDAP_DEBUG_STATS,
 519                     "conn=%ld fd=%d closed\n",
 520                         c->c_connid, sd, 0, 0, 0 );
 521         }
 522
 523         ber_pvt_sb_destroy( c->c_sb );
 524
 525     c->c_conn_state = SLAP_C_INVALID;
 526     c->c_struct_state = SLAP_C_UNUSED;
 527 }
 528
 529 int connection_state_closing( Connection *c )
 530 {
 531         /* c_mutex must be locked by caller */
 532
 533         int state;
 534         assert( c != NULL );
 535         assert( c->c_struct_state == SLAP_C_USED );
 536
 537         state = c->c_conn_state;
 538
 539         assert( state != SLAP_C_INVALID );
 540
 541         return state == SLAP_C_CLOSING;
 542 }
 543
 544 static void connection_abandon( Connection *c )
 545 {
 546         /* c_mutex must be locked by caller */
 547
 548         Operation *o;
 549
 550         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 551                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 552                 o->o_abandon = 1;
 553                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 554         }
 555
 556         /* remove pending operations */
 557         for( o = slap_op_pop( &c->c_pending_ops );
 558                 o != NULL;
 559                 o = slap_op_pop( &c->c_pending_ops ) )
 560         {
 561                 slap_op_free( o );
 562         }
 563 }
 564
 565 void connection_closing( Connection *c )
 566 {
 567         assert( connections != NULL );
 568         assert( c != NULL );
 569         assert( c->c_struct_state == SLAP_C_USED );
 570         assert( c->c_conn_state != SLAP_C_INVALID );
 571
 572         /* c_mutex must be locked by caller */
 573
 574         if( c->c_conn_state != SLAP_C_CLOSING ) {
 575
 576                 Debug( LDAP_DEBUG_TRACE,
 577                         "connection_closing: readying conn=%ld sd=%d for close\n",
 578                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 579
 580                 /* update state to closing */
 581                 c->c_conn_state = SLAP_C_CLOSING;
 582
 583                 /* don't listen on this port anymore */
 584                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 585
 586                 /* shutdown I/O -- not yet implemented */
 587
 588                 /* abandon active operations */
 589                 connection_abandon( c );
 590
 591                 /* wake write blocked operations */
 592                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 593                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 594         }
 595 }
 596
 597 static void connection_close( Connection *c )
 598 {
 599         assert( connections != NULL );
 600         assert( c != NULL );
 601         assert( c->c_struct_state == SLAP_C_USED );
 602         assert( c->c_conn_state == SLAP_C_CLOSING );
 603
 604         /* note: connections_mutex and c_mutex should be locked by caller */
 605
 606         if( c->c_ops != NULL ) {
 607                 Debug( LDAP_DEBUG_TRACE,
 608                         "connection_close: deferring conn=%ld sd=%d\n",
 609                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 610
 611                 return;
 612         }
 613
 614         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 615                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 616
 617         connection_destroy( c );
 618 }
 619
 620 unsigned long connections_nextid(void)
 621 {
 622         unsigned long id;
 623         assert( connections != NULL );
 624
 625         ldap_pvt_thread_mutex_lock( &connections_mutex );
 626
 627         id = conn_nextid;
 628
 629         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 630
 631         return id;
 632 }
 633
 634 Connection* connection_first( ber_socket_t *index )
 635 {
 636         assert( connections != NULL );
 637         assert( index != NULL );
 638
 639         ldap_pvt_thread_mutex_lock( &connections_mutex );
 640
 641         *index = 0;
 642
 643         return connection_next(NULL, index);
 644 }
 645
 646 Connection* connection_next( Connection *c, ber_socket_t *index )
 647 {
 648         assert( connections != NULL );
 649         assert( index != NULL );
 650         assert( *index <= dtblsize );
 651
 652         if( c != NULL ) {
 653                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 654         }
 655
 656         c = NULL;
 657
 658         for(; *index < dtblsize; (*index)++) {
 659                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 660                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 661 #ifndef HAVE_WINSOCK
 662                         continue;
 663 #else
 664                         break;
 665 #endif
 666                 }
 667
 668                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 669                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 670                         c = &connections[(*index)++];
 671                         break;
 672                 }
 673
 674                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 675                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 676         }
 677
 678         if( c != NULL ) {
 679                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 680         }
 681
 682         return c;
 683 }
 684
 685 void connection_done( Connection *c )
 686 {
 687         assert( connections != NULL );
 688
 689         if( c != NULL ) {
 690                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 691         }
 692
 693         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 694 }
 695
 696 /*
 697  * connection_activity - handle the request operation op on connection
 698  * conn.  This routine figures out what kind of operation it is and
 699  * calls the appropriate stub to handle it.
 700  */
 701
 702 static void *
 703 connection_operation( void *arg_v )
 704 {
 705         int rc;
 706         struct co_arg   *arg = arg_v;
 707         ber_tag_t tag = arg->co_op->o_tag;
 708         Connection *conn = arg->co_conn;
 709
 710         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 711         num_ops_initiated++;
 712         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 713
 714         switch ( tag ) {
 715         case LDAP_REQ_BIND:
 716                 rc = do_bind( conn, arg->co_op );
 717                 break;
 718
 719         case LDAP_REQ_UNBIND:
 720                 rc = do_unbind( conn, arg->co_op );
 721                 break;
 722
 723         case LDAP_REQ_ADD:
 724                 rc = do_add( conn, arg->co_op );
 725                 break;
 726
 727         case LDAP_REQ_DELETE:
 728                 rc = do_delete( conn, arg->co_op );
 729                 break;
 730
 731         case LDAP_REQ_MODRDN:
 732                 rc = do_modrdn( conn, arg->co_op );
 733                 break;
 734
 735         case LDAP_REQ_MODIFY:
 736                 rc = do_modify( conn, arg->co_op );
 737                 break;
 738
 739         case LDAP_REQ_COMPARE:
 740                 rc = do_compare( conn, arg->co_op );
 741                 break;
 742
 743         case LDAP_REQ_SEARCH:
 744                 rc = do_search( conn, arg->co_op );
 745                 break;
 746
 747         case LDAP_REQ_ABANDON:
 748                 rc = do_abandon( conn, arg->co_op );
 749                 break;
 750
 751         case LDAP_REQ_EXTENDED:
 752                 rc = do_extended( conn, arg->co_op );
 753                 break;
 754
 755         default:
 756                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 757                     tag, 0, 0 );
 758                 arg->co_op->o_tag = LBER_ERROR;
 759                 send_ldap_disconnect( conn, arg->co_op,
 760                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 761                 rc = -1;
 762                 break;
 763         }
 764
 765         if( rc == -1 ) tag = LBER_ERROR;
 766
 767         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 768         num_ops_completed++;
 769         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 770
 771         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 772
 773         conn->c_n_ops_executing--;
 774         conn->c_n_ops_completed++;
 775
 776         slap_op_remove( &conn->c_ops, arg->co_op );
 777         slap_op_free( arg->co_op );
 778         arg->co_op = NULL;
 779         arg->co_conn = NULL;
 780         free( (char *) arg );
 781         arg = NULL;
 782
 783         switch( tag ) {
 784         case LBER_ERROR:
 785         case LDAP_REQ_UNBIND:
 786                 /* c_mutex is locked */
 787                 connection_closing( conn );
 788                 break;
 789
 790         case LDAP_REQ_BIND:
 791                 if( conn->c_conn_state == SLAP_C_BINDING) {
 792                         conn->c_conn_state = SLAP_C_ACTIVE;
 793                 }
 794                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 795         }
 796
 797         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 798         active_threads--;
 799         if( active_threads < 1 ) {
 800                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 801         }
 802         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 803
 804         connection_resched( conn );
 805
 806         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 807
 808         return NULL;
 809 }
 810
 811 int connection_read(ber_socket_t s)
 812 {
 813         int rc = 0;
 814         Connection *c;
 815         assert( connections != NULL );
 816
 817         ldap_pvt_thread_mutex_lock( &connections_mutex );
 818
 819         /* get (locked) connection */
 820         c = connection_get( s );
 821
 822         if( c == NULL ) {
 823                 Debug( LDAP_DEBUG_ANY,
 824                         "connection_read(%ld): no connection!\n",
 825                         (long) s, 0, 0 );
 826
 827                 slapd_remove(s, 0);
 828
 829                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 830                 return -1;
 831         }
 832
 833         c->c_n_read++;
 834
 835         if( c->c_conn_state == SLAP_C_CLOSING ) {
 836                 Debug( LDAP_DEBUG_TRACE,
 837                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 838                         s, c->c_connid, 0 );
 839
 840                 connection_return( c );
 841                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 842                 return 0;
 843         }
 844
 845         Debug( LDAP_DEBUG_TRACE,
 846                 "connection_read(%d): checking for input on id=%ld\n",
 847                 s, c->c_connid, 0 );
 848
 849 #ifdef HAVE_TLS
 850         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 851                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 852                 if ( rc < 0 ) {
 853                         Debug( LDAP_DEBUG_TRACE,
 854                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 855                                s, rc, c->c_connid );
 856
 857                         c->c_needs_tls_accept = 0;
 858                         /* connections_mutex and c_mutex are locked */
 859                         connection_closing( c );
 860                         connection_close( c );
 861                 } else if ( rc == 0 ) {
 862                         c->c_needs_tls_accept = 0;
 863                 }
 864                 connection_return( c );
 865                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 866                 return 0;
 867         }
 868 #endif
 869
 870 #define CONNECTION_INPUT_LOOP 1
 871
 872 #ifdef DATA_READY_LOOP
 873         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 874 #elif CONNECTION_INPUT_LOOP
 875         while(!rc)
 876 #endif
 877         {
 878                 /* How do we do this without getting into a busy loop ? */
 879                 rc = connection_input( c );
 880         }
 881
 882         if( rc < 0 ) {
 883                 Debug( LDAP_DEBUG_TRACE,
 884                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 885                         s, rc, c->c_connid );
 886
 887                 /* connections_mutex and c_mutex are locked */
 888                 connection_closing( c );
 889                 connection_close( c );
 890         }
 891
 892         if ( ber_pvt_sb_needs_read( c->c_sb ) )
 893                 slapd_set_read( s, 1 );
 894         if ( ber_pvt_sb_needs_write( c->c_sb ) )
 895                 slapd_set_write( s, 1 );
 896         connection_return( c );
 897         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 898         return 0;
 899 }
 900
 901 static int
 902 connection_input(
 903     Connection *conn
 904 )
 905 {
 906         Operation *op;
 907         ber_tag_t       tag;
 908         ber_len_t       len;
 909         ber_int_t       msgid;
 910         BerElement      *ber;
 911
 912         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 913             == NULL ) {
 914                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 915                 return -1;
 916         }
 917
 918         errno = 0;
 919         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 920             != LDAP_TAG_MESSAGE )
 921         {
 922                 int err = errno;
 923
 924                 Debug( LDAP_DEBUG_TRACE,
 925                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 926                         ber_pvt_sb_get_desc( conn->c_sb ), err, STRERROR(err) );
 927                 Debug( LDAP_DEBUG_TRACE,
 928                         "\t*** got %ld of %lu so far\n",
 929                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 930                         conn->c_currentber->ber_len, 0 );
 931
 932                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 933                         /* log, close and send error */
 934                         ber_free( conn->c_currentber, 1 );
 935                         conn->c_currentber = NULL;
 936
 937                         return -2;
 938                 }
 939                 return 1;
 940         }
 941
 942         ber = conn->c_currentber;
 943         conn->c_currentber = NULL;
 944
 945         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 946                 /* log, close and send error */
 947                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 948                     0 );
 949                 ber_free( ber, 1 );
 950                 return -1;
 951         }
 952
 953         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 954                 /* log, close and send error */
 955                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 956                     0 );
 957                 ber_free( ber, 1 );
 958
 959                 return -1;
 960         }
 961
 962         if(tag == LDAP_REQ_BIND) {
 963                 /* immediately abandon all exiting operations upon BIND */
 964                 connection_abandon( conn );
 965         }
 966
 967         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 968
 969         if ( conn->c_conn_state == SLAP_C_BINDING
 970                 || conn->c_conn_state == SLAP_C_CLOSING )
 971         {
 972                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 973                 conn->c_n_ops_pending++;
 974                 slap_op_add( &conn->c_pending_ops, op );
 975
 976         } else {
 977                 conn->c_n_ops_executing++;
 978                 connection_op_activate( conn, op );
 979         }
 980
 981 #ifdef NO_THREADS
 982         if ( conn->c_struct_state != SLAP_C_USED ) {
 983                 /* connection must have got closed underneath us */
 984                 return 1;
 985         }
 986 #endif
 987         assert( conn->c_struct_state == SLAP_C_USED );
 988
 989         return 0;
 990 }
 991
 992 static int
 993 connection_resched( Connection *conn )
 994 {
 995         Operation *op;
 996
 997         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 998                 Debug( LDAP_DEBUG_TRACE,
 999                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1000                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
1001
1002                 connection_close( conn );
1003                 return 0;
1004         }
1005
1006         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1007                 /* other states need different handling */
1008                 return 0;
1009         }
1010
1011         for( op = slap_op_pop( &conn->c_pending_ops );
1012                 op != NULL;
1013                 op = slap_op_pop( &conn->c_pending_ops ) )
1014         {
1015                 /* pending operations should not be marked for abandonment */
1016                 assert(!op->o_abandon);
1017
1018                 conn->c_n_ops_pending--;
1019                 conn->c_n_ops_executing++;
1020
1021                 connection_op_activate( conn, op );
1022
1023                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1024                         break;
1025                 }
1026         }
1027         return 0;
1028 }
1029
1030 static int connection_op_activate( Connection *conn, Operation *op )
1031 {
1032         struct co_arg *arg;
1033         char *tmpdn;
1034         int status;
1035         ber_tag_t tag = op->o_tag;
1036
1037         if(tag == LDAP_REQ_BIND) {
1038                 conn->c_conn_state = SLAP_C_BINDING;
1039         }
1040
1041         if ( conn->c_dn != NULL ) {
1042                 tmpdn = ch_strdup( conn->c_dn );
1043         } else {
1044                 tmpdn = NULL;
1045         }
1046
1047         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1048         arg->co_conn = conn;
1049         arg->co_op = op;
1050
1051         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
1052
1053         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1054         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1055         (void) dn_normalize_case( arg->co_op->o_ndn );
1056
1057         arg->co_op->o_protocol = conn->c_protocol;
1058         arg->co_op->o_connid = conn->c_connid;
1059
1060         arg->co_op->o_authtype = conn->c_authtype;
1061         arg->co_op->o_authmech = conn->c_authmech != NULL
1062                 ?  ch_strdup( conn->c_authmech ) : NULL;
1063
1064         slap_op_add( &conn->c_ops, arg->co_op );
1065
1066         if( tmpdn != NULL ) {
1067                 free( tmpdn );
1068         }
1069
1070         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1071         active_threads++;
1072         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1073
1074         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1075                                          connection_operation, (void *) arg );
1076
1077         if ( status != 0 ) {
1078                 Debug( LDAP_DEBUG_ANY,
1079                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1080
1081                 /* should move op to pending list */
1082         }
1083
1084         return status;
1085 }
1086
1087 int connection_write(ber_socket_t s)
1088 {
1089         Connection *c;
1090         assert( connections != NULL );
1091
1092         ldap_pvt_thread_mutex_lock( &connections_mutex );
1093
1094         c = connection_get( s );
1095
1096         slapd_clr_write( s, 0);
1097
1098         if( c == NULL ) {
1099                 Debug( LDAP_DEBUG_ANY,
1100                         "connection_write(%ld): no connection!\n",
1101                         (long) s, 0, 0 );
1102                 slapd_remove(s, 0);
1103                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1104                 return -1;
1105         }
1106
1107         c->c_n_write++;
1108
1109         Debug( LDAP_DEBUG_TRACE,
1110                 "connection_write(%d): waking output for id=%ld\n",
1111                 s, c->c_connid, 0 );
1112
1113         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1114
1115         if ( ber_pvt_sb_needs_read( c->c_sb ) )
1116                 slapd_set_read( s, 1 );
1117         if ( ber_pvt_sb_needs_write( c->c_sb ) )
1118                 slapd_set_write( s, 1 );
1119         connection_return( c );
1120         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1121         return 0;
1122 }