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

   1 #include "portable.h"
   2
   3 #include <stdio.h>
   4
   5 #include <ac/errno.h>
   6 #include <ac/signal.h>
   7 #include <ac/socket.h>
   8 #include <ac/string.h>
   9 #include <ac/time.h>
  10
  11 #include "slap.h"
  12
  13 #ifdef HAVE_WINSOCK
  14 #define EWOULDBLOCK WSAEWOULDBLOCK
  15 #endif
  16
  17 /* protected by connections_mutex */
  18 static ldap_pvt_thread_mutex_t connections_mutex;
  19 static Connection *connections = NULL;
  20 static int conn_index = -1;
  21 static long conn_nextid = 0;
  22
  23 /* structure state (protected by connections_mutex) */
  24 #define SLAP_C_UNINITIALIZED    0x0     /* MUST BE ZERO (0) */
  25 #define SLAP_C_UNUSED                   0x1
  26 #define SLAP_C_USED                             0x2
  27
  28 /* connection state (protected by c_mutex ) */
  29 #define SLAP_C_INVALID                  0x0     /* MUST BE ZERO (0) */
  30 #define SLAP_C_INACTIVE                 0x1     /* zero threads */
  31 #define SLAP_C_ACTIVE                   0x2 /* one or more threads */
  32 #define SLAP_C_BINDING                  0x3     /* binding */
  33 #define SLAP_C_CLOSING                  0x4     /* closing */
  34
  35 void slapd_remove(int s);
  36 static Connection* connection_get( int s );
  37
  38 static int connection_input( Connection *c );
  39 static void connection_close( Connection *c );
  40
  41 static int connection_op_activate( Connection *conn, Operation *op );
  42 static int connection_resched( Connection *conn );
  43
  44 struct co_arg {
  45         Connection      *co_conn;
  46         Operation       *co_op;
  47 };
  48
  49 /*
  50  * Initialize connection management infrastructure.
  51  */
  52 int connections_init(void)
  53 {
  54         int i;
  55
  56         assert( connections == NULL );
  57
  58         if( connections != NULL) {
  59                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  60                         0, 0, 0 );
  61                 return -1;
  62         }
  63
  64         /* should check return of every call */
  65         ldap_pvt_thread_mutex_init( &connections_mutex );
  66
  67         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  68
  69         if( connections == NULL ) {
  70                 Debug( LDAP_DEBUG_ANY,
  71                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  72                         dtblsize, (long) sizeof(Connection), 0 );
  73                 return -1;
  74         }
  75
  76         for ( i = 0; i < dtblsize; i++ )
  77                 memset( &connections[i], 0, sizeof(Connection) );
  78
  79         /*
  80          * per entry initialization of the Connection array initialization
  81          * will be done by connection_init()
  82          */
  83
  84         return 0;
  85 }
  86
  87 /*
  88  * Destroy connection management infrastructure.
  89  */
  90 int connections_destroy(void)
  91 {
  92         int i;
  93
  94         /* should check return of every call */
  95
  96         if( connections == NULL) {
  97                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
  98                         0, 0, 0 );
  99                 return -1;
 100         }
 101
 102         for ( i = 0; i < dtblsize; i++ ) {
 103                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 104                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 105                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 106                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 107                 }
 108
 109                 free( &connections[i] );
 110         }
 111
 112         free( connections );
 113         connections = NULL;
 114
 115         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 116         return 0;
 117 }
 118
 119 /*
 120  * shutdown all connections
 121  */
 122 int connections_shutdown(void)
 123 {
 124         int i;
 125
 126         ldap_pvt_thread_mutex_lock( &connections_mutex );
 127
 128         for ( i = 0; i < dtblsize; i++ ) {
 129                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 130                         continue;
 131                 }
 132
 133                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 134                 connection_closing( &connections[i] );
 135                 connection_close( &connections[i] );
 136                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 137         }
 138
 139         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 140 }
 141
 142 static Connection* connection_get( int s )
 143 {
 144         Connection *c = NULL;
 145
 146         assert( connections != NULL );
 147
 148         if(s < 0) {
 149                 return NULL;
 150         }
 151
 152 #ifndef HAVE_WINSOCK
 153         assert( connections[s].c_struct_state == SLAP_C_USED );
 154         assert( connections[s].c_conn_state != SLAP_C_INVALID );
 155         assert( connections[s].c_sb.sb_sd != -1 );
 156
 157         c = &connections[s];
 158 #else
 159         {
 160                 int i;
 161
 162                 for(i=0; i<dtblsize; i++) {
 163                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 164                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 165                                 assert( connections[i].c_sb.sb_sd == 0 );
 166                                 break;
 167                         }
 168
 169                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 170                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 171                                 assert( connections[i].c_sb.sb_sd == -1 );
 172                                 continue;
 173                         }
 174
 175                         assert( connections[i].c_struct_state == SLAP_C_USED );
 176                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 177                         assert( connections[i].c_sb.sb_sd != -1 );
 178
 179                         if( connections[i].c_sb.sb_sd == s ) {
 180                                 c = &connections[i];
 181                                 break;
 182                         }
 183                 }
 184         }
 185 #endif
 186
 187         if( c != NULL ) {
 188                 /* we do this BEFORE locking to aid in debugging */
 189                 Debug( LDAP_DEBUG_TRACE,
 190                         "connection_get(%d): got connid=%ld\n",
 191                         s, c->c_connid, 0 );
 192
 193                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 194         }
 195         return c;
 196 }
 197
 198 static void connection_return( Connection *c )
 199 {
 200         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 201 }
 202
 203 long connection_init(
 204         int s,
 205         const char* name,
 206         const char* addr)
 207 {
 208         long id;
 209         Connection *c;
 210         assert( connections != NULL );
 211
 212         if( s < 0 ) {
 213                 return -1;
 214         }
 215
 216         assert( s >= 0 );
 217 #ifndef HAVE_WINSOCK
 218         assert( s < dtblsize );
 219 #endif
 220
 221         ldap_pvt_thread_mutex_lock( &connections_mutex );
 222
 223 #ifndef HAVE_WINSOCK
 224         c = &connections[s];
 225
 226 #else
 227         {
 228                 int i;
 229
 230         for( i=0; i < dtblsize; i++) {
 231             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 232                 assert( connections[i].c_sb.sb_sd == 0 );
 233                 c = &connections[i];
 234                 break;
 235             }
 236
 237             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 238                 assert( connections[i].c_sb.sb_sd == -1 );
 239                 c = &connections[i];
 240                 break;
 241             }
 242
 243             assert( connections[i].c_struct_state == SLAP_C_USED );
 244             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 245             assert( connections[i].c_sb.sb_sd != -1 );
 246         }
 247
 248         if( c == NULL ) {
 249             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 250             return -1;
 251         }
 252     }
 253 #endif
 254
 255     assert( c != NULL );
 256     assert( c->c_struct_state != SLAP_C_USED );
 257     assert( c->c_conn_state == SLAP_C_INVALID );
 258
 259     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 260         c->c_dn = NULL;
 261         c->c_cdn = NULL;
 262         c->c_client_name = NULL;
 263         c->c_client_addr = NULL;
 264         c->c_ops = NULL;
 265         c->c_pending_ops = NULL;
 266
 267         lber_pvt_sb_init( &c->c_sb );
 268
 269         /* should check status of thread calls */
 270         ldap_pvt_thread_mutex_init( &c->c_mutex );
 271         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 272         ldap_pvt_thread_cond_init( &c->c_write_cv );
 273
 274         c->c_struct_state = SLAP_C_UNUSED;
 275     }
 276
 277     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 278
 279     assert( c->c_struct_state == SLAP_C_UNUSED );
 280     assert(     c->c_dn == NULL );
 281     assert(     c->c_cdn == NULL );
 282     assert( c->c_client_name == NULL );
 283     assert( c->c_client_addr == NULL );
 284     assert( c->c_ops == NULL );
 285     assert( c->c_pending_ops == NULL );
 286
 287     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 288     c->c_client_addr = ch_strdup( addr );
 289
 290     c->c_n_ops_received = 0;
 291 #ifdef LDAP_COUNTERS
 292     c->c_n_ops_executing = 0;
 293     c->c_n_ops_pending = 0;
 294     c->c_n_ops_completed = 0;
 295 #endif
 296
 297     c->c_starttime = slap_get_time();
 298
 299     lber_pvt_sb_set_desc( &c->c_sb, s );
 300     lber_pvt_sb_set_io( &c->c_sb, &lber_pvt_sb_io_tcp, NULL );
 301
 302     if( lber_pvt_sb_set_nonblock( &c->c_sb, 1 ) < 0 ) {
 303         Debug( LDAP_DEBUG_ANY,
 304             "connection_init(%d, %s, %s): set nonblocking failed\n",
 305             s, c->c_client_name, c->c_client_addr);
 306     }
 307
 308     id = c->c_connid = conn_nextid++;
 309
 310     c->c_conn_state = SLAP_C_INACTIVE;
 311     c->c_struct_state = SLAP_C_USED;
 312
 313     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 314     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 315
 316     return id;
 317 }
 318
 319 static void
 320 connection_destroy( Connection *c )
 321 {
 322     assert( connections != NULL );
 323     assert( c != NULL );
 324     assert( c->c_struct_state != SLAP_C_UNUSED );
 325     assert( c->c_conn_state != SLAP_C_INVALID );
 326     assert( c->c_ops == NULL );
 327
 328     c->c_struct_state = SLAP_C_UNUSED;
 329     c->c_conn_state = SLAP_C_INVALID;
 330
 331     c->c_version = 0;
 332     c->c_protocol = 0;
 333
 334     c->c_starttime = 0;
 335
 336     if(c->c_dn != NULL) {
 337         free(c->c_dn);
 338         c->c_dn = NULL;
 339     }
 340         if(c->c_cdn != NULL) {
 341                 free(c->c_cdn);
 342                 c->c_cdn = NULL;
 343         }
 344         if(c->c_client_name != NULL) {
 345                 free(c->c_client_name);
 346                 c->c_client_name = NULL;
 347         }
 348         if(c->c_client_addr != NULL) {
 349                 free(c->c_client_addr);
 350                 c->c_client_addr = NULL;
 351         }
 352
 353         if ( lber_pvt_sb_in_use(&c->c_sb) ) {
 354                 int sd = lber_pvt_sb_get_desc(&c->c_sb);
 355
 356                 slapd_remove( sd );
 357                 lber_pvt_sb_close( &c->c_sb );
 358
 359                 Statslog( LDAP_DEBUG_STATS,
 360                     "conn=%d fd=%d closed.\n",
 361                         c->c_connid, sd, 0, 0, 0 );
 362         }
 363
 364         lber_pvt_sb_destroy( &c->c_sb );
 365 }
 366
 367 int connection_state_closing( Connection *c )
 368 {
 369         /* connection must be locked by caller */
 370         int state;
 371         assert( c != NULL );
 372         assert( c->c_struct_state == SLAP_C_USED );
 373
 374         state = c->c_conn_state;
 375
 376         assert( state != SLAP_C_INVALID );
 377
 378         return state == SLAP_C_CLOSING;
 379 }
 380
 381 void connection_closing( Connection *c )
 382 {
 383         assert( connections != NULL );
 384         assert( c != NULL );
 385         assert( c->c_struct_state == SLAP_C_USED );
 386         assert( c->c_conn_state != SLAP_C_INVALID );
 387
 388         if( c->c_conn_state != SLAP_C_CLOSING ) {
 389                 Operation *o;
 390
 391                 Debug( LDAP_DEBUG_TRACE,
 392                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 393                         c->c_connid, c->c_sb.sb_sd, 0 );
 394
 395                 /* update state to closing */
 396                 c->c_conn_state = SLAP_C_CLOSING;
 397
 398                 /* don't listen on this port anymore */
 399                 slapd_clr_read( c->c_sb.sb_sd, 1 );
 400
 401                 /* shutdown I/O -- not yet implemented */
 402
 403                 /* abandon active operations */
 404                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 405                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 406                         o->o_abandon = 1;
 407                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 408                 }
 409
 410                 /* remove pending operations */
 411                 for( o = slap_op_pop( &c->c_pending_ops );
 412                         o != NULL;
 413                         o = slap_op_pop( &c->c_pending_ops ) )
 414                 {
 415                         slap_op_free( o );
 416                 }
 417
 418                 /* wake write blocked operations */
 419                 slapd_clr_write( c->c_sb.sb_sd, 1 );
 420                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 421         }
 422 }
 423
 424 static void connection_close( Connection *c )
 425 {
 426         assert( connections != NULL );
 427         assert( c != NULL );
 428         assert( c->c_struct_state == SLAP_C_USED );
 429         assert( c->c_conn_state == SLAP_C_CLOSING );
 430
 431         if( c->c_ops != NULL ) {
 432                 Debug( LDAP_DEBUG_TRACE,
 433                         "connection_close: deferring conn=%ld sd=%d.\n",
 434                         c->c_connid, c->c_sb.sb_sd, 0 );
 435
 436                 return;
 437         }
 438
 439         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 440                 c->c_connid, c->c_sb.sb_sd, 0 );
 441
 442         connection_destroy( c );
 443 }
 444
 445 long connections_nextid(void)
 446 {
 447         long id;
 448         assert( connections != NULL );
 449
 450         ldap_pvt_thread_mutex_lock( &connections_mutex );
 451
 452         id = conn_nextid;
 453
 454         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 455
 456         return id;
 457 }
 458
 459 Connection* connection_first(void)
 460 {
 461         assert( connections != NULL );
 462
 463         ldap_pvt_thread_mutex_lock( &connections_mutex );
 464
 465         assert( conn_index == -1 );
 466         conn_index = 0;
 467
 468         return connection_next(NULL);
 469 }
 470
 471 Connection* connection_next(Connection *c)
 472 {
 473         assert( connections != NULL );
 474         assert( conn_index != -1 );
 475         assert( conn_index <= dtblsize );
 476
 477         if( c != NULL ) {
 478                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 479         }
 480
 481         c = NULL;
 482
 483         for(; conn_index < dtblsize; conn_index++) {
 484                 if( connections[conn_index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 485                         assert( connections[conn_index].c_conn_state == SLAP_C_INVALID );
 486 #ifndef HAVE_WINSOCK
 487                         continue;
 488 #else
 489                         break;
 490 #endif
 491                 }
 492
 493                 if( connections[conn_index].c_struct_state == SLAP_C_USED ) {
 494                         assert( connections[conn_index].c_conn_state != SLAP_C_INVALID );
 495                         c = &connections[conn_index++];
 496                         break;
 497                 }
 498
 499                 assert( connections[conn_index].c_struct_state == SLAP_C_UNUSED );
 500                 assert( connections[conn_index].c_conn_state == SLAP_C_INVALID );
 501         }
 502
 503         if( c != NULL ) {
 504                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 505         }
 506
 507         return c;
 508 }
 509
 510 void connection_done(Connection *c)
 511 {
 512         assert( connections != NULL );
 513         assert( conn_index != -1 );
 514         assert( conn_index <= dtblsize );
 515
 516         if( c != NULL ) {
 517                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 518         }
 519
 520         conn_index = -1;
 521         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 522 }
 523
 524 /*
 525  * connection_activity - handle the request operation op on connection
 526  * conn.  This routine figures out what kind of operation it is and
 527  * calls the appropriate stub to handle it.
 528  */
 529
 530 static void *
 531 connection_operation( void *arg_v )
 532 {
 533         struct co_arg   *arg = arg_v;
 534         int tag = arg->co_op->o_tag;
 535         Connection *conn = arg->co_conn;
 536
 537 #ifdef LDAP_COUNTERS
 538         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 539         num_ops_initiated++;
 540         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 541 #endif
 542
 543         switch ( tag ) {
 544         case LDAP_REQ_BIND:
 545                 do_bind( conn, arg->co_op );
 546                 break;
 547
 548 #ifdef LDAP_COMPAT30
 549         case LDAP_REQ_UNBIND_30:
 550 #endif
 551         case LDAP_REQ_UNBIND:
 552                 do_unbind( conn, arg->co_op );
 553                 break;
 554
 555         case LDAP_REQ_ADD:
 556                 do_add( conn, arg->co_op );
 557                 break;
 558
 559 #ifdef LDAP_COMPAT30
 560         case LDAP_REQ_DELETE_30:
 561 #endif
 562         case LDAP_REQ_DELETE:
 563                 do_delete( conn, arg->co_op );
 564                 break;
 565
 566         case LDAP_REQ_MODRDN:
 567                 do_modrdn( conn, arg->co_op );
 568                 break;
 569
 570         case LDAP_REQ_MODIFY:
 571                 do_modify( conn, arg->co_op );
 572                 break;
 573
 574         case LDAP_REQ_COMPARE:
 575                 do_compare( conn, arg->co_op );
 576                 break;
 577
 578         case LDAP_REQ_SEARCH:
 579                 do_search( conn, arg->co_op );
 580                 break;
 581
 582 #ifdef LDAP_COMPAT30
 583         case LDAP_REQ_ABANDON_30:
 584 #endif
 585         case LDAP_REQ_ABANDON:
 586                 do_abandon( conn, arg->co_op );
 587                 break;
 588
 589         default:
 590                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 591                     arg->co_op->o_tag, 0, 0 );
 592                 break;
 593         }
 594
 595 #ifdef LDAP_COUNTERS
 596         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 597         num_ops_completed++;
 598         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 599 #endif
 600
 601         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 602
 603 #ifdef LDAP_COUNTERS
 604         conn->c_n_ops_completed++;
 605 #endif
 606
 607         slap_op_remove( &conn->c_ops, arg->co_op );
 608         slap_op_free( arg->co_op );
 609         arg->co_op = NULL;
 610         arg->co_conn = NULL;
 611         free( (char *) arg );
 612         arg = NULL;
 613
 614         switch( tag ) {
 615 #ifdef LDAP_COMPAT30
 616         case LDAP_REQ_UNBIND_30:
 617 #endif
 618         case LDAP_REQ_UNBIND:
 619                 connection_closing( conn );
 620                 break;
 621
 622         case LDAP_REQ_BIND:
 623                 if( conn->c_conn_state == SLAP_C_BINDING) {
 624                         conn->c_conn_state = SLAP_C_ACTIVE;
 625                 }
 626         }
 627
 628         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 629                 Debug( LDAP_DEBUG_TRACE,
 630                         "connection_operation: attempting closing conn=%ld sd=%d.\n",
 631                         conn->c_connid, conn->c_sb.sb_sd, 0 );
 632
 633                 connection_close( conn );
 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         c = connection_get( s );
 659         if( c == NULL ) {
 660                 Debug( LDAP_DEBUG_ANY,
 661                         "connection_read(%d): no connection!\n",
 662                         s, 0, 0 );
 663                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 664                 return -1;
 665         }
 666
 667         if( c->c_conn_state == SLAP_C_CLOSING ) {
 668                 Debug( LDAP_DEBUG_TRACE,
 669                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 670                         s, c->c_connid, 0 );
 671
 672                 connection_return( c );
 673                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 674                 return 0;
 675         }
 676
 677         Debug( LDAP_DEBUG_TRACE,
 678                 "connection_read(%d): checking for input on id=%ld\n",
 679                 s, c->c_connid, 0 );
 680
 681 #define CONNECTION_INPUT_LOOP 1
 682
 683 #ifdef DATA_READY_LOOP
 684         while(!rc && lber_pvt_sb_data_ready(&c->c_sb))
 685 #elif CONNECTION_INPUT_LOOP
 686         while(!rc)
 687 #endif
 688         {
 689                 rc = connection_input( c );
 690         }
 691
 692         if( rc < 0 ) {
 693                 Debug( LDAP_DEBUG_TRACE,
 694                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 695                         s, rc, c->c_connid );
 696
 697                 connection_closing( c );
 698                 connection_close( c );
 699         }
 700
 701         connection_return( c );
 702         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 703         return 0;
 704 }
 705
 706 static int
 707 connection_input(
 708     Connection *conn
 709 )
 710 {
 711         Operation *op;
 712         unsigned long   tag, len;
 713         long            msgid;
 714         BerElement      *ber;
 715
 716         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 717             == NULL ) {
 718                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 719                 return -1;
 720         }
 721
 722         errno = 0;
 723         if ( (tag = ber_get_next( &conn->c_sb, &len, conn->c_currentber ))
 724             != LDAP_TAG_MESSAGE )
 725         {
 726                 int err = errno;
 727
 728                 Debug( LDAP_DEBUG_TRACE,
 729                         "ber_get_next on fd %d failed errno %d (%s)\n",
 730                         lber_pvt_sb_get_desc(&conn->c_sb), err,
 731                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 732                 Debug( LDAP_DEBUG_TRACE,
 733                         "\t*** got %ld of %lu so far\n",
 734                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 735                         conn->c_currentber->ber_len, 0 );
 736
 737                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 738                         /* log, close and send error */
 739                         ber_free( conn->c_currentber, 1 );
 740                         conn->c_currentber = NULL;
 741
 742                         return -2;
 743                 }
 744                 return 1;
 745         }
 746
 747         ber = conn->c_currentber;
 748         conn->c_currentber = NULL;
 749
 750         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 751                 /* log, close and send error */
 752                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 753                     0 );
 754                 ber_free( ber, 1 );
 755                 return -1;
 756         }
 757
 758         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 759                 /* log, close and send error */
 760                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 761                     0 );
 762                 ber_free( ber, 1 );
 763
 764                 return -1;
 765         }
 766
 767 #ifdef LDAP_COMPAT30
 768         if ( conn->c_version == 30 ) {
 769                 (void) ber_skip_tag( ber, &len );
 770         }
 771 #endif
 772
 773         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 774
 775         if ( conn->c_conn_state == SLAP_C_BINDING
 776                 || conn->c_conn_state == SLAP_C_CLOSING )
 777         {
 778                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 779                 slap_op_add( &conn->c_pending_ops, op );
 780
 781         } else {
 782                 connection_op_activate( conn, op );
 783         }
 784
 785 #ifdef NO_THREADS
 786         if ( conn->c_struct_state != SLAP_C_USED ) {
 787                 /* connection must have got closed underneath us */
 788                 return 1;
 789         }
 790 #endif
 791         assert( conn->c_struct_state == SLAP_C_USED );
 792
 793         return 0;
 794 }
 795
 796 static int
 797 connection_resched( Connection *conn )
 798 {
 799         Operation *op;
 800
 801         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 802                 /* other states need different handling */
 803                 return 0;
 804         }
 805
 806         for( op = slap_op_pop( &conn->c_pending_ops );
 807                 op != NULL;
 808                 op = slap_op_pop( &conn->c_pending_ops ) )
 809         {
 810                 /* pending operations should not be marked for abandonment */
 811                 assert(!op->o_abandon);
 812
 813                 connection_op_activate( conn, op );
 814
 815                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 816                         break;
 817                 }
 818         }
 819         return 0;
 820 }
 821
 822 static int connection_op_activate( Connection *conn, Operation *op )
 823 {
 824         struct co_arg *arg;
 825         char *tmpdn;
 826         int status;
 827         unsigned long tag = op->o_tag;
 828
 829         if ( conn->c_dn != NULL ) {
 830                 tmpdn = ch_strdup( conn->c_dn );
 831         } else {
 832                 tmpdn = NULL;
 833         }
 834
 835         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 836         arg->co_conn = conn;
 837         arg->co_op = op;
 838
 839         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 840         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 841
 842         slap_op_add( &conn->c_ops, arg->co_op );
 843
 844         if(tag == LDAP_REQ_BIND) {
 845                 conn->c_conn_state = SLAP_C_BINDING;
 846         }
 847
 848         if ( tmpdn != NULL ) {
 849                 free( tmpdn );
 850         }
 851
 852         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 853         active_threads++;
 854         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 855
 856         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 857                                          connection_operation, (void *) arg );
 858
 859         if ( status != 0 ) {
 860                 Debug( LDAP_DEBUG_ANY,
 861                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 862
 863                 /* should move op to pending list */
 864         }
 865
 866         return status;
 867 }
 868
 869 int connection_write(int s)
 870 {
 871         Connection *c;
 872         assert( connections != NULL );
 873
 874         ldap_pvt_thread_mutex_lock( &connections_mutex );
 875
 876         c = connection_get( s );
 877         if( c == NULL ) {
 878                 Debug( LDAP_DEBUG_ANY,
 879                         "connection_write(%d): no connection!\n",
 880                         s, 0, 0 );
 881                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 882                 return -1;
 883         }
 884
 885         Debug( LDAP_DEBUG_TRACE,
 886                 "connection_write(%d): waking output for id=%ld\n",
 887                 s, c->c_connid, 0 );
 888
 889         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 890
 891         connection_return( c );
 892         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 893         return 0;
 894 }