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