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

   1 #include "portable.h"
   2
   3 #include <stdio.h>
   4
   5 #include <ac/socket.h>
   6 #include <ac/errno.h>
   7 #include <ac/signal.h>
   8 #include <ac/string.h>
   9 #include <ac/time.h>
  10
  11 #include "slap.h"
  12
  13 /* we need LBER internals */
  14 #include "../../libraries/liblber/lber-int.h"
  15
  16 /* protected by connections_mutex */
  17 static ldap_pvt_thread_mutex_t connections_mutex;
  18 static Connection *connections = NULL;
  19 static unsigned long conn_nextid = 0;
  20
  21 /* structure state (protected by connections_mutex) */
  22 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  23 #define SLAP_C_UNUSED                   0x01
  24 #define SLAP_C_USED                             0x02
  25
  26 /* connection state (protected by c_mutex ) */
  27 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  28 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  29 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  30 #define SLAP_C_BINDING                  0x03    /* binding */
  31 #define SLAP_C_CLOSING                  0x04    /* closing */
  32
  33 static Connection* connection_get( ber_socket_t s );
  34
  35 static int connection_input( Connection *c );
  36 static void connection_close( Connection *c );
  37
  38 static int connection_op_activate( Connection *conn, Operation *op );
  39 static int connection_resched( Connection *conn );
  40
  41 struct co_arg {
  42         Connection      *co_conn;
  43         Operation       *co_op;
  44 };
  45
  46 /*
  47  * Initialize connection management infrastructure.
  48  */
  49 int connections_init(void)
  50 {
  51         assert( connections == NULL );
  52
  53         if( connections != NULL) {
  54                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  55                         0, 0, 0 );
  56                 return -1;
  57         }
  58
  59         /* should check return of every call */
  60         ldap_pvt_thread_mutex_init( &connections_mutex );
  61
  62         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  63
  64         if( connections == NULL ) {
  65                 Debug( LDAP_DEBUG_ANY,
  66                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  67                         dtblsize, (long) sizeof(Connection), 0 );
  68                 return -1;
  69         }
  70
  71     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  72     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  73
  74         /*
  75          * per entry initialization of the Connection array initialization
  76          * will be done by connection_init()
  77          */
  78
  79         return 0;
  80 }
  81
  82 /*
  83  * Destroy connection management infrastructure.
  84  */
  85 int connections_destroy(void)
  86 {
  87         ber_socket_t i;
  88
  89         /* should check return of every call */
  90
  91         if( connections == NULL) {
  92                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
  93                         0, 0, 0 );
  94                 return -1;
  95         }
  96
  97         for ( i = 0; i < dtblsize; i++ ) {
  98                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
  99                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 100                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 101                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 102                 }
 103         }
 104
 105         free( connections );
 106         connections = NULL;
 107
 108         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 109         return 0;
 110 }
 111
 112 /*
 113  * shutdown all connections
 114  */
 115 int connections_shutdown(void)
 116 {
 117         ber_socket_t i;
 118
 119         ldap_pvt_thread_mutex_lock( &connections_mutex );
 120
 121         for ( i = 0; i < dtblsize; i++ ) {
 122                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 123                         continue;
 124                 }
 125
 126                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 127
 128                 /* connections_mutex and c_mutex are locked */
 129                 connection_closing( &connections[i] );
 130                 connection_close( &connections[i] );
 131
 132                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 133         }
 134
 135         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 136
 137         return 0;
 138 }
 139
 140 /*
 141  * Timeout idle connections.
 142  */
 143 int connections_timeout_idle(time_t now)
 144 {
 145         int i = 0;
 146         int connindex;
 147         Connection* c;
 148
 149         ldap_pvt_thread_mutex_lock( &connections_mutex );
 150
 151         for( c = connection_first( &connindex );
 152                 c != NULL;
 153                 c = connection_next( c, &connindex ) )
 154         {
 155                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 156                         /* close it */
 157                         connection_closing( c );
 158                         connection_close( c );
 159                         i++;
 160                 }
 161         }
 162         connection_done( c );
 163
 164         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 165
 166         return i;
 167 }
 168
 169 static Connection* connection_get( ber_socket_t s )
 170 {
 171         /* connections_mutex should be locked by caller */
 172
 173         Connection *c;
 174
 175         Debug( LDAP_DEBUG_ARGS,
 176                 "connection_get(%ld)\n",
 177                 (long) s, 0, 0 );
 178
 179         assert( connections != NULL );
 180
 181         if(s == AC_SOCKET_INVALID) {
 182                 return NULL;
 183         }
 184
 185 #ifndef HAVE_WINSOCK
 186         c = &connections[s];
 187
 188         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 189
 190 #else
 191         c = NULL;
 192         {
 193                 ber_socket_t i;
 194
 195                 for(i=0; i<dtblsize; i++) {
 196                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 197                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 198                                 assert( connections[i].c_sb == 0 );
 199                                 break;
 200                         }
 201
 202                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 203                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 204                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 205                                 continue;
 206                         }
 207
 208                         /* state can actually change from used -> unused by resched,
 209                          * so don't assert details here.
 210                          */
 211
 212                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 213                                 c = &connections[i];
 214                                 break;
 215                         }
 216                 }
 217         }
 218 #endif
 219
 220         if( c != NULL ) {
 221                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 222
 223                 if( c->c_struct_state != SLAP_C_USED ) {
 224                         /* connection must have been closed due to resched */
 225
 226                         assert( c->c_conn_state == SLAP_C_INVALID );
 227                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 228
 229                         Debug( LDAP_DEBUG_TRACE,
 230                                 "connection_get(%d): connection not used.\n",
 231                                 s, c->c_connid, 0 );
 232
 233                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 234                         return NULL;
 235                 }
 236
 237                 Debug( LDAP_DEBUG_TRACE,
 238                         "connection_get(%d): got connid=%ld\n",
 239                         s, c->c_connid, 0 );
 240
 241                 assert( c->c_struct_state == SLAP_C_USED );
 242                 assert( c->c_conn_state != SLAP_C_INVALID );
 243                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 244
 245         c->c_activitytime = slap_get_time();
 246         }
 247
 248         return c;
 249 }
 250
 251 static void connection_return( Connection *c )
 252 {
 253         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 254 }
 255
 256 long connection_init(
 257         ber_socket_t s,
 258         const char* name,
 259         const char* addr)
 260 {
 261         unsigned long id;
 262         Connection *c;
 263         assert( connections != NULL );
 264
 265         if( s == AC_SOCKET_INVALID ) {
 266         Debug( LDAP_DEBUG_ANY,
 267                         "connection_init(%ld): invalid.\n",
 268                         (long) s, 0, 0 );
 269                 return -1;
 270         }
 271
 272         assert( s >= 0 );
 273 #ifndef HAVE_WINSOCK
 274         assert( s < dtblsize );
 275 #endif
 276
 277         ldap_pvt_thread_mutex_lock( &connections_mutex );
 278
 279 #ifndef HAVE_WINSOCK
 280         c = &connections[s];
 281
 282 #else
 283         {
 284                 unsigned int i;
 285
 286                 c = NULL;
 287
 288         for( i=0; i < dtblsize; i++) {
 289             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 290                 assert( connections[i].c_sb == 0 );
 291                 c = &connections[i];
 292                 break;
 293             }
 294
 295             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 296                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 297                 c = &connections[i];
 298                 break;
 299             }
 300
 301             assert( connections[i].c_struct_state == SLAP_C_USED );
 302             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 303             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 304         }
 305
 306         if( c == NULL ) {
 307                 Debug( LDAP_DEBUG_ANY,
 308                                 "connection_init(%d): connection table full (%d/%d).\n",
 309                                 s, i, dtblsize);
 310             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 311             return -1;
 312         }
 313     }
 314 #endif
 315
 316     assert( c != NULL );
 317     assert( c->c_struct_state != SLAP_C_USED );
 318     assert( c->c_conn_state == SLAP_C_INVALID );
 319
 320     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 321         c->c_dn = NULL;
 322         c->c_cdn = NULL;
 323         c->c_client_name = NULL;
 324         c->c_client_addr = NULL;
 325         c->c_ops = NULL;
 326         c->c_pending_ops = NULL;
 327
 328         c->c_sb = ber_sockbuf_alloc( );
 329
 330         /* should check status of thread calls */
 331         ldap_pvt_thread_mutex_init( &c->c_mutex );
 332         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 333         ldap_pvt_thread_cond_init( &c->c_write_cv );
 334
 335         c->c_struct_state = SLAP_C_UNUSED;
 336     }
 337
 338     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 339
 340     assert( c->c_struct_state == SLAP_C_UNUSED );
 341     assert(     c->c_dn == NULL );
 342     assert(     c->c_cdn == NULL );
 343     assert( c->c_client_name == NULL );
 344     assert( c->c_client_addr == NULL );
 345     assert( c->c_ops == NULL );
 346     assert( c->c_pending_ops == NULL );
 347
 348     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 349     c->c_client_addr = ch_strdup( addr );
 350
 351     c->c_n_ops_received = 0;
 352 #ifdef LDAP_COUNTERS
 353     c->c_n_ops_executing = 0;
 354     c->c_n_ops_pending = 0;
 355     c->c_n_ops_completed = 0;
 356 #endif
 357
 358     c->c_activitytime = c->c_starttime = slap_get_time();
 359
 360     ber_pvt_sb_set_desc( c->c_sb, s );
 361     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 362
 363     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 364         Debug( LDAP_DEBUG_ANY,
 365             "connection_init(%d, %s, %s): set nonblocking failed\n",
 366             s, c->c_client_name, c->c_client_addr);
 367     }
 368
 369     id = c->c_connid = conn_nextid++;
 370
 371     c->c_conn_state = SLAP_C_INACTIVE;
 372     c->c_struct_state = SLAP_C_USED;
 373
 374     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 375     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 376
 377     return id;
 378 }
 379
 380 static void
 381 connection_destroy( Connection *c )
 382 {
 383         /* note: connections_mutex should be locked by caller */
 384
 385     assert( connections != NULL );
 386     assert( c != NULL );
 387     assert( c->c_struct_state != SLAP_C_UNUSED );
 388     assert( c->c_conn_state != SLAP_C_INVALID );
 389     assert( c->c_ops == NULL );
 390
 391 #ifdef LDAP_COMPAT30
 392     c->c_version = 0;
 393 #endif
 394     c->c_protocol = 0;
 395
 396     c->c_activitytime = c->c_starttime = 0;
 397
 398     if(c->c_dn != NULL) {
 399         free(c->c_dn);
 400         c->c_dn = NULL;
 401     }
 402         if(c->c_cdn != NULL) {
 403                 free(c->c_cdn);
 404                 c->c_cdn = NULL;
 405         }
 406         if(c->c_client_name != NULL) {
 407                 free(c->c_client_name);
 408                 c->c_client_name = NULL;
 409         }
 410         if(c->c_client_addr != NULL) {
 411                 free(c->c_client_addr);
 412                 c->c_client_addr = NULL;
 413         }
 414
 415         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 416                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 417
 418                 slapd_remove( sd, 0 );
 419                 ber_pvt_sb_close( c->c_sb );
 420
 421                 Statslog( LDAP_DEBUG_STATS,
 422                     "conn=%d fd=%d closed.\n",
 423                         c->c_connid, sd, 0, 0, 0 );
 424         }
 425
 426         ber_pvt_sb_destroy( c->c_sb );
 427
 428     c->c_conn_state = SLAP_C_INVALID;
 429     c->c_struct_state = SLAP_C_UNUSED;
 430 }
 431
 432 int connection_state_closing( Connection *c )
 433 {
 434         /* c_mutex must be locked by caller */
 435
 436         int state;
 437         assert( c != NULL );
 438         assert( c->c_struct_state == SLAP_C_USED );
 439
 440         state = c->c_conn_state;
 441
 442         assert( state != SLAP_C_INVALID );
 443
 444         return state == SLAP_C_CLOSING;
 445 }
 446
 447 void connection_closing( Connection *c )
 448 {
 449         assert( connections != NULL );
 450         assert( c != NULL );
 451         assert( c->c_struct_state == SLAP_C_USED );
 452         assert( c->c_conn_state != SLAP_C_INVALID );
 453
 454         /* c_mutex must be locked by caller */
 455
 456         if( c->c_conn_state != SLAP_C_CLOSING ) {
 457                 Operation *o;
 458
 459                 Debug( LDAP_DEBUG_TRACE,
 460                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 461                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 462
 463                 /* update state to closing */
 464                 c->c_conn_state = SLAP_C_CLOSING;
 465
 466                 /* don't listen on this port anymore */
 467                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 468
 469                 /* shutdown I/O -- not yet implemented */
 470
 471                 /* abandon active operations */
 472                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 473                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 474                         o->o_abandon = 1;
 475                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 476                 }
 477
 478                 /* remove pending operations */
 479                 for( o = slap_op_pop( &c->c_pending_ops );
 480                         o != NULL;
 481                         o = slap_op_pop( &c->c_pending_ops ) )
 482                 {
 483                         slap_op_free( o );
 484                 }
 485
 486                 /* wake write blocked operations */
 487                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 488                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 489         }
 490 }
 491
 492 static void connection_close( Connection *c )
 493 {
 494         assert( connections != NULL );
 495         assert( c != NULL );
 496         assert( c->c_struct_state == SLAP_C_USED );
 497         assert( c->c_conn_state == SLAP_C_CLOSING );
 498
 499         /* note: connections_mutex and c_mutex should be locked by caller */
 500
 501         if( c->c_ops != NULL ) {
 502                 Debug( LDAP_DEBUG_TRACE,
 503                         "connection_close: deferring conn=%ld sd=%d.\n",
 504                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 505
 506                 return;
 507         }
 508
 509         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 510                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 511
 512         connection_destroy( c );
 513 }
 514
 515 unsigned long connections_nextid(void)
 516 {
 517         unsigned long id;
 518         assert( connections != NULL );
 519
 520         ldap_pvt_thread_mutex_lock( &connections_mutex );
 521
 522         id = conn_nextid;
 523
 524         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 525
 526         return id;
 527 }
 528
 529 Connection* connection_first( ber_socket_t *index )
 530 {
 531         assert( connections != NULL );
 532         assert( index != NULL );
 533
 534         ldap_pvt_thread_mutex_lock( &connections_mutex );
 535
 536         *index = 0;
 537
 538         return connection_next(NULL, index);
 539 }
 540
 541 Connection* connection_next( Connection *c, ber_socket_t *index )
 542 {
 543         assert( connections != NULL );
 544         assert( index != NULL );
 545         assert( *index <= dtblsize );
 546
 547         if( c != NULL ) {
 548                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 549         }
 550
 551         c = NULL;
 552
 553         for(; *index < dtblsize; (*index)++) {
 554                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 555                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 556 #ifndef HAVE_WINSOCK
 557                         continue;
 558 #else
 559                         break;
 560 #endif
 561                 }
 562
 563                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 564                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 565                         c = &connections[(*index)++];
 566                         break;
 567                 }
 568
 569                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 570                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 571         }
 572
 573         if( c != NULL ) {
 574                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 575         }
 576
 577         return c;
 578 }
 579
 580 void connection_done( Connection *c )
 581 {
 582         assert( connections != NULL );
 583
 584         if( c != NULL ) {
 585                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 586         }
 587
 588         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 589 }
 590
 591 /*
 592  * connection_activity - handle the request operation op on connection
 593  * conn.  This routine figures out what kind of operation it is and
 594  * calls the appropriate stub to handle it.
 595  */
 596
 597 static void *
 598 connection_operation( void *arg_v )
 599 {
 600         struct co_arg   *arg = arg_v;
 601         ber_tag_t tag = arg->co_op->o_tag;
 602         Connection *conn = arg->co_conn;
 603
 604 #ifdef LDAP_COUNTERS
 605         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 606         num_ops_initiated++;
 607         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 608 #endif
 609
 610         switch ( tag ) {
 611         case LDAP_REQ_BIND:
 612                 do_bind( conn, arg->co_op );
 613                 break;
 614
 615 #ifdef LDAP_COMPAT30
 616         case LDAP_REQ_UNBIND_30:
 617 #endif
 618         case LDAP_REQ_UNBIND:
 619                 do_unbind( conn, arg->co_op );
 620                 break;
 621
 622         case LDAP_REQ_ADD:
 623                 do_add( conn, arg->co_op );
 624                 break;
 625
 626 #ifdef LDAP_COMPAT30
 627         case LDAP_REQ_DELETE_30:
 628 #endif
 629         case LDAP_REQ_DELETE:
 630                 do_delete( conn, arg->co_op );
 631                 break;
 632
 633         case LDAP_REQ_MODRDN:
 634                 do_modrdn( conn, arg->co_op );
 635                 break;
 636
 637         case LDAP_REQ_MODIFY:
 638                 do_modify( conn, arg->co_op );
 639                 break;
 640
 641         case LDAP_REQ_COMPARE:
 642                 do_compare( conn, arg->co_op );
 643                 break;
 644
 645         case LDAP_REQ_SEARCH:
 646                 do_search( conn, arg->co_op );
 647                 break;
 648
 649 #ifdef LDAP_COMPAT30
 650         case LDAP_REQ_ABANDON_30:
 651 #endif
 652         case LDAP_REQ_ABANDON:
 653                 do_abandon( conn, arg->co_op );
 654                 break;
 655
 656         default:
 657                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 658                     arg->co_op->o_tag, 0, 0 );
 659                 break;
 660         }
 661
 662 #ifdef LDAP_COUNTERS
 663         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 664         num_ops_completed++;
 665         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 666 #endif
 667
 668         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 669
 670 #ifdef LDAP_COUNTERS
 671         conn->c_n_ops_completed++;
 672 #endif
 673
 674         slap_op_remove( &conn->c_ops, arg->co_op );
 675         slap_op_free( arg->co_op );
 676         arg->co_op = NULL;
 677         arg->co_conn = NULL;
 678         free( (char *) arg );
 679         arg = NULL;
 680
 681         switch( tag ) {
 682 #ifdef LDAP_COMPAT30
 683         case LDAP_REQ_UNBIND_30:
 684 #endif
 685         case LDAP_REQ_UNBIND:
 686                 /* c_mutex is locked */
 687                 connection_closing( conn );
 688                 break;
 689
 690         case LDAP_REQ_BIND:
 691                 if( conn->c_conn_state == SLAP_C_BINDING) {
 692                         conn->c_conn_state = SLAP_C_ACTIVE;
 693                 }
 694         }
 695
 696         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 697         active_threads--;
 698         if( active_threads < 1 ) {
 699                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 700         }
 701         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 702
 703         connection_resched( conn );
 704
 705         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 706
 707         return NULL;
 708 }
 709
 710 int connection_read(ber_socket_t s)
 711 {
 712         int rc = 0;
 713         Connection *c;
 714         assert( connections != NULL );
 715
 716         ldap_pvt_thread_mutex_lock( &connections_mutex );
 717
 718         /* get (locked) connection */
 719         c = connection_get( s );
 720
 721         if( c == NULL ) {
 722                 Debug( LDAP_DEBUG_ANY,
 723                         "connection_read(%ld): no connection!\n",
 724                         (long) s, 0, 0 );
 725
 726                 slapd_remove(s, 0);
 727
 728                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 729                 return -1;
 730         }
 731
 732         if( c->c_conn_state == SLAP_C_CLOSING ) {
 733                 Debug( LDAP_DEBUG_TRACE,
 734                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 735                         s, c->c_connid, 0 );
 736
 737                 connection_return( c );
 738                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 739                 return 0;
 740         }
 741
 742         Debug( LDAP_DEBUG_TRACE,
 743                 "connection_read(%d): checking for input on id=%ld\n",
 744                 s, c->c_connid, 0 );
 745
 746 #define CONNECTION_INPUT_LOOP 1
 747
 748 #ifdef DATA_READY_LOOP
 749         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 750 #elif CONNECTION_INPUT_LOOP
 751         while(!rc)
 752 #endif
 753         {
 754                 rc = connection_input( c );
 755         }
 756
 757         if( rc < 0 ) {
 758                 Debug( LDAP_DEBUG_TRACE,
 759                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 760                         s, rc, c->c_connid );
 761
 762                 /* connections_mutex and c_mutex are locked */
 763                 connection_closing( c );
 764                 connection_close( c );
 765         }
 766
 767         connection_return( c );
 768         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 769         return 0;
 770 }
 771
 772 static int
 773 connection_input(
 774     Connection *conn
 775 )
 776 {
 777         Operation *op;
 778         ber_tag_t       tag;
 779         ber_len_t       len;
 780         ber_int_t       msgid;
 781         BerElement      *ber;
 782
 783         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 784             == NULL ) {
 785                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 786                 return -1;
 787         }
 788
 789         errno = 0;
 790         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 791             != LDAP_TAG_MESSAGE )
 792         {
 793                 int err = errno;
 794
 795                 Debug( LDAP_DEBUG_TRACE,
 796                         "ber_get_next on fd %d failed errno %d (%s)\n",
 797                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 798                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 799                 Debug( LDAP_DEBUG_TRACE,
 800                         "\t*** got %ld of %lu so far\n",
 801                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 802                         conn->c_currentber->ber_len, 0 );
 803
 804                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 805                         /* log, close and send error */
 806                         ber_free( conn->c_currentber, 1 );
 807                         conn->c_currentber = NULL;
 808
 809                         return -2;
 810                 }
 811                 return 1;
 812         }
 813
 814         ber = conn->c_currentber;
 815         conn->c_currentber = NULL;
 816
 817         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 818                 /* log, close and send error */
 819                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 820                     0 );
 821                 ber_free( ber, 1 );
 822                 return -1;
 823         }
 824
 825         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 826                 /* log, close and send error */
 827                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 828                     0 );
 829                 ber_free( ber, 1 );
 830
 831                 return -1;
 832         }
 833
 834 #ifdef LDAP_COMPAT30
 835         if ( conn->c_version == 30 ) {
 836                 (void) ber_skip_tag( ber, &len );
 837         }
 838 #endif
 839
 840         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 841
 842         if ( conn->c_conn_state == SLAP_C_BINDING
 843                 || conn->c_conn_state == SLAP_C_CLOSING )
 844         {
 845                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 846                 slap_op_add( &conn->c_pending_ops, op );
 847
 848         } else {
 849                 connection_op_activate( conn, op );
 850         }
 851
 852 #ifdef NO_THREADS
 853         if ( conn->c_struct_state != SLAP_C_USED ) {
 854                 /* connection must have got closed underneath us */
 855                 return 1;
 856         }
 857 #endif
 858         assert( conn->c_struct_state == SLAP_C_USED );
 859
 860         return 0;
 861 }
 862
 863 static int
 864 connection_resched( Connection *conn )
 865 {
 866         Operation *op;
 867
 868         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 869                 Debug( LDAP_DEBUG_TRACE,
 870                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 871                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 872
 873                 connection_close( conn );
 874                 return 0;
 875         }
 876
 877         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 878                 /* other states need different handling */
 879                 return 0;
 880         }
 881
 882         for( op = slap_op_pop( &conn->c_pending_ops );
 883                 op != NULL;
 884                 op = slap_op_pop( &conn->c_pending_ops ) )
 885         {
 886                 /* pending operations should not be marked for abandonment */
 887                 assert(!op->o_abandon);
 888
 889                 connection_op_activate( conn, op );
 890
 891                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 892                         break;
 893                 }
 894         }
 895         return 0;
 896 }
 897
 898 static int connection_op_activate( Connection *conn, Operation *op )
 899 {
 900         struct co_arg *arg;
 901         char *tmpdn;
 902         int status;
 903         ber_tag_t tag = op->o_tag;
 904
 905         if ( conn->c_dn != NULL ) {
 906                 tmpdn = ch_strdup( conn->c_dn );
 907         } else {
 908                 tmpdn = NULL;
 909         }
 910
 911         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 912         arg->co_conn = conn;
 913         arg->co_op = op;
 914
 915         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 916         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 917
 918         slap_op_add( &conn->c_ops, arg->co_op );
 919
 920         if(tag == LDAP_REQ_BIND) {
 921                 conn->c_conn_state = SLAP_C_BINDING;
 922         }
 923
 924         if ( tmpdn != NULL ) {
 925                 free( tmpdn );
 926         }
 927
 928         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 929         active_threads++;
 930         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 931
 932         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 933                                          connection_operation, (void *) arg );
 934
 935         if ( status != 0 ) {
 936                 Debug( LDAP_DEBUG_ANY,
 937                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 938
 939                 /* should move op to pending list */
 940         }
 941
 942         return status;
 943 }
 944
 945 int connection_write(ber_socket_t s)
 946 {
 947         Connection *c;
 948         assert( connections != NULL );
 949
 950         ldap_pvt_thread_mutex_lock( &connections_mutex );
 951
 952         c = connection_get( s );
 953
 954         slapd_clr_write( s, 0);
 955
 956         if( c == NULL ) {
 957                 Debug( LDAP_DEBUG_ANY,
 958                         "connection_write(%ld): no connection!\n",
 959                         (long) s, 0, 0 );
 960                 slapd_remove(s, 0);
 961                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 962                 return -1;
 963         }
 964
 965         Debug( LDAP_DEBUG_TRACE,
 966                 "connection_write(%d): waking output for id=%ld\n",
 967                 s, c->c_connid, 0 );
 968
 969         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 970
 971         connection_return( c );
 972         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 973         return 0;
 974 }