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