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                 c->c_n_get++;
 242
 243                 assert( c->c_struct_state == SLAP_C_USED );
 244                 assert( c->c_conn_state != SLAP_C_INVALID );
 245                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 246
 247         c->c_activitytime = slap_get_time();
 248         }
 249
 250         return c;
 251 }
 252
 253 static void connection_return( Connection *c )
 254 {
 255         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 256 }
 257
 258 long connection_init(
 259         ber_socket_t s,
 260         const char* name,
 261         const char* addr)
 262 {
 263         unsigned long id;
 264         Connection *c;
 265         assert( connections != NULL );
 266
 267         if( s == AC_SOCKET_INVALID ) {
 268         Debug( LDAP_DEBUG_ANY,
 269                         "connection_init(%ld): invalid.\n",
 270                         (long) s, 0, 0 );
 271                 return -1;
 272         }
 273
 274         assert( s >= 0 );
 275 #ifndef HAVE_WINSOCK
 276         assert( s < dtblsize );
 277 #endif
 278
 279         ldap_pvt_thread_mutex_lock( &connections_mutex );
 280
 281 #ifndef HAVE_WINSOCK
 282         c = &connections[s];
 283
 284 #else
 285         {
 286                 unsigned int i;
 287
 288                 c = NULL;
 289
 290         for( i=0; i < dtblsize; i++) {
 291             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 292                 assert( connections[i].c_sb == 0 );
 293                 c = &connections[i];
 294                 break;
 295             }
 296
 297             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 298                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 299                 c = &connections[i];
 300                 break;
 301             }
 302
 303             assert( connections[i].c_struct_state == SLAP_C_USED );
 304             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 305             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 306         }
 307
 308         if( c == NULL ) {
 309                 Debug( LDAP_DEBUG_ANY,
 310                                 "connection_init(%d): connection table full (%d/%d).\n",
 311                                 s, i, dtblsize);
 312             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 313             return -1;
 314         }
 315     }
 316 #endif
 317
 318     assert( c != NULL );
 319     assert( c->c_struct_state != SLAP_C_USED );
 320     assert( c->c_conn_state == SLAP_C_INVALID );
 321
 322     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 323         c->c_dn = NULL;
 324         c->c_cdn = NULL;
 325         c->c_client_name = NULL;
 326         c->c_client_addr = NULL;
 327         c->c_ops = NULL;
 328         c->c_pending_ops = NULL;
 329
 330         c->c_sb = ber_sockbuf_alloc( );
 331
 332         /* should check status of thread calls */
 333         ldap_pvt_thread_mutex_init( &c->c_mutex );
 334         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 335         ldap_pvt_thread_cond_init( &c->c_write_cv );
 336
 337         c->c_struct_state = SLAP_C_UNUSED;
 338     }
 339
 340     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 341
 342     assert( c->c_struct_state == SLAP_C_UNUSED );
 343     assert(     c->c_dn == NULL );
 344     assert(     c->c_cdn == NULL );
 345     assert( c->c_client_name == NULL );
 346     assert( c->c_client_addr == NULL );
 347     assert( c->c_ops == NULL );
 348     assert( c->c_pending_ops == NULL );
 349
 350     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 351     c->c_client_addr = ch_strdup( addr );
 352
 353     c->c_n_ops_received = 0;
 354     c->c_n_ops_executing = 0;
 355     c->c_n_ops_pending = 0;
 356     c->c_n_ops_completed = 0;
 357
 358         c->c_n_get = 0;
 359         c->c_n_read = 0;
 360         c->c_n_write = 0;
 361
 362     c->c_activitytime = c->c_starttime = slap_get_time();
 363
 364     ber_pvt_sb_set_desc( c->c_sb, s );
 365     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 366
 367     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 368         Debug( LDAP_DEBUG_ANY,
 369             "connection_init(%d, %s, %s): set nonblocking failed\n",
 370             s, c->c_client_name, c->c_client_addr);
 371     }
 372
 373     id = c->c_connid = conn_nextid++;
 374
 375     c->c_conn_state = SLAP_C_INACTIVE;
 376     c->c_struct_state = SLAP_C_USED;
 377
 378     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 379     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 380
 381     backend_connection_init(c);
 382
 383     return id;
 384 }
 385
 386 static void
 387 connection_destroy( Connection *c )
 388 {
 389         /* note: connections_mutex should be locked by caller */
 390
 391     assert( connections != NULL );
 392     assert( c != NULL );
 393     assert( c->c_struct_state != SLAP_C_UNUSED );
 394     assert( c->c_conn_state != SLAP_C_INVALID );
 395     assert( c->c_ops == NULL );
 396
 397     backend_connection_destroy(c);
 398
 399     c->c_protocol = 0;
 400
 401     c->c_activitytime = c->c_starttime = 0;
 402
 403     if(c->c_dn != NULL) {
 404         free(c->c_dn);
 405         c->c_dn = NULL;
 406     }
 407         if(c->c_cdn != NULL) {
 408                 free(c->c_cdn);
 409                 c->c_cdn = NULL;
 410         }
 411         if(c->c_client_name != NULL) {
 412                 free(c->c_client_name);
 413                 c->c_client_name = NULL;
 414         }
 415         if(c->c_client_addr != NULL) {
 416                 free(c->c_client_addr);
 417                 c->c_client_addr = NULL;
 418         }
 419
 420         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 421                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 422
 423                 slapd_remove( sd, 0 );
 424                 ber_pvt_sb_close( c->c_sb );
 425
 426                 Statslog( LDAP_DEBUG_STATS,
 427                     "conn=%d fd=%d closed.\n",
 428                         c->c_connid, sd, 0, 0, 0 );
 429         }
 430
 431         ber_pvt_sb_destroy( c->c_sb );
 432
 433     c->c_conn_state = SLAP_C_INVALID;
 434     c->c_struct_state = SLAP_C_UNUSED;
 435 }
 436
 437 int connection_state_closing( Connection *c )
 438 {
 439         /* c_mutex must be locked by caller */
 440
 441         int state;
 442         assert( c != NULL );
 443         assert( c->c_struct_state == SLAP_C_USED );
 444
 445         state = c->c_conn_state;
 446
 447         assert( state != SLAP_C_INVALID );
 448
 449         return state == SLAP_C_CLOSING;
 450 }
 451
 452 void connection_closing( Connection *c )
 453 {
 454         assert( connections != NULL );
 455         assert( c != NULL );
 456         assert( c->c_struct_state == SLAP_C_USED );
 457         assert( c->c_conn_state != SLAP_C_INVALID );
 458
 459         /* c_mutex must be locked by caller */
 460
 461         if( c->c_conn_state != SLAP_C_CLOSING ) {
 462                 Operation *o;
 463
 464                 Debug( LDAP_DEBUG_TRACE,
 465                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 466                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 467
 468                 /* update state to closing */
 469                 c->c_conn_state = SLAP_C_CLOSING;
 470
 471                 /* don't listen on this port anymore */
 472                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 473
 474                 /* shutdown I/O -- not yet implemented */
 475
 476                 /* abandon active operations */
 477                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 478                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 479                         o->o_abandon = 1;
 480                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 481                 }
 482
 483                 /* remove pending operations */
 484                 for( o = slap_op_pop( &c->c_pending_ops );
 485                         o != NULL;
 486                         o = slap_op_pop( &c->c_pending_ops ) )
 487                 {
 488                         slap_op_free( o );
 489                 }
 490
 491                 /* wake write blocked operations */
 492                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 493                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 494         }
 495 }
 496
 497 static void connection_close( Connection *c )
 498 {
 499         assert( connections != NULL );
 500         assert( c != NULL );
 501         assert( c->c_struct_state == SLAP_C_USED );
 502         assert( c->c_conn_state == SLAP_C_CLOSING );
 503
 504         /* note: connections_mutex and c_mutex should be locked by caller */
 505
 506         if( c->c_ops != NULL ) {
 507                 Debug( LDAP_DEBUG_TRACE,
 508                         "connection_close: deferring conn=%ld sd=%d.\n",
 509                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 510
 511                 return;
 512         }
 513
 514         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 515                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 516
 517         connection_destroy( c );
 518 }
 519
 520 unsigned long connections_nextid(void)
 521 {
 522         unsigned long id;
 523         assert( connections != NULL );
 524
 525         ldap_pvt_thread_mutex_lock( &connections_mutex );
 526
 527         id = conn_nextid;
 528
 529         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 530
 531         return id;
 532 }
 533
 534 Connection* connection_first( ber_socket_t *index )
 535 {
 536         assert( connections != NULL );
 537         assert( index != NULL );
 538
 539         ldap_pvt_thread_mutex_lock( &connections_mutex );
 540
 541         *index = 0;
 542
 543         return connection_next(NULL, index);
 544 }
 545
 546 Connection* connection_next( Connection *c, ber_socket_t *index )
 547 {
 548         assert( connections != NULL );
 549         assert( index != NULL );
 550         assert( *index <= dtblsize );
 551
 552         if( c != NULL ) {
 553                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 554         }
 555
 556         c = NULL;
 557
 558         for(; *index < dtblsize; (*index)++) {
 559                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 560                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 561 #ifndef HAVE_WINSOCK
 562                         continue;
 563 #else
 564                         break;
 565 #endif
 566                 }
 567
 568                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 569                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 570                         c = &connections[(*index)++];
 571                         break;
 572                 }
 573
 574                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 575                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 576         }
 577
 578         if( c != NULL ) {
 579                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 580         }
 581
 582         return c;
 583 }
 584
 585 void connection_done( Connection *c )
 586 {
 587         assert( connections != NULL );
 588
 589         if( c != NULL ) {
 590                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 591         }
 592
 593         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 594 }
 595
 596 /*
 597  * connection_activity - handle the request operation op on connection
 598  * conn.  This routine figures out what kind of operation it is and
 599  * calls the appropriate stub to handle it.
 600  */
 601
 602 static void *
 603 connection_operation( void *arg_v )
 604 {
 605         struct co_arg   *arg = arg_v;
 606         ber_tag_t tag = arg->co_op->o_tag;
 607         Connection *conn = arg->co_conn;
 608
 609         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 610         num_ops_initiated++;
 611         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 612
 613         switch ( tag ) {
 614         case LDAP_REQ_BIND:
 615                 do_bind( conn, arg->co_op );
 616                 break;
 617
 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         case LDAP_REQ_DELETE:
 627                 do_delete( conn, arg->co_op );
 628                 break;
 629
 630         case LDAP_REQ_MODRDN:
 631                 do_modrdn( conn, arg->co_op );
 632                 break;
 633
 634         case LDAP_REQ_MODIFY:
 635                 do_modify( conn, arg->co_op );
 636                 break;
 637
 638         case LDAP_REQ_COMPARE:
 639                 do_compare( conn, arg->co_op );
 640                 break;
 641
 642         case LDAP_REQ_SEARCH:
 643                 do_search( conn, arg->co_op );
 644                 break;
 645
 646         case LDAP_REQ_ABANDON:
 647                 do_abandon( conn, arg->co_op );
 648                 break;
 649
 650         default:
 651                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 652                     arg->co_op->o_tag, 0, 0 );
 653                 break;
 654         }
 655
 656         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 657         num_ops_completed++;
 658         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 659
 660         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 661
 662         conn->c_n_ops_executing--;
 663         conn->c_n_ops_completed++;
 664
 665         slap_op_remove( &conn->c_ops, arg->co_op );
 666         slap_op_free( arg->co_op );
 667         arg->co_op = NULL;
 668         arg->co_conn = NULL;
 669         free( (char *) arg );
 670         arg = NULL;
 671
 672         switch( tag ) {
 673         case LDAP_REQ_UNBIND:
 674                 /* c_mutex is locked */
 675                 connection_closing( conn );
 676                 break;
 677
 678         case LDAP_REQ_BIND:
 679                 if( conn->c_conn_state == SLAP_C_BINDING) {
 680                         conn->c_conn_state = SLAP_C_ACTIVE;
 681                 }
 682         }
 683
 684         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 685         active_threads--;
 686         if( active_threads < 1 ) {
 687                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 688         }
 689         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 690
 691         connection_resched( conn );
 692
 693         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 694
 695         return NULL;
 696 }
 697
 698 int connection_read(ber_socket_t s)
 699 {
 700         int rc = 0;
 701         Connection *c;
 702         assert( connections != NULL );
 703
 704         ldap_pvt_thread_mutex_lock( &connections_mutex );
 705
 706         /* get (locked) connection */
 707         c = connection_get( s );
 708
 709         if( c == NULL ) {
 710                 Debug( LDAP_DEBUG_ANY,
 711                         "connection_read(%ld): no connection!\n",
 712                         (long) s, 0, 0 );
 713
 714                 slapd_remove(s, 0);
 715
 716                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 717                 return -1;
 718         }
 719
 720         c->c_n_read++;
 721
 722         if( c->c_conn_state == SLAP_C_CLOSING ) {
 723                 Debug( LDAP_DEBUG_TRACE,
 724                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 725                         s, c->c_connid, 0 );
 726
 727                 connection_return( c );
 728                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 729                 return 0;
 730         }
 731
 732         Debug( LDAP_DEBUG_TRACE,
 733                 "connection_read(%d): checking for input on id=%ld\n",
 734                 s, c->c_connid, 0 );
 735
 736 #define CONNECTION_INPUT_LOOP 1
 737
 738 #ifdef DATA_READY_LOOP
 739         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 740 #elif CONNECTION_INPUT_LOOP
 741         while(!rc)
 742 #endif
 743         {
 744                 rc = connection_input( c );
 745         }
 746
 747         if( rc < 0 ) {
 748                 Debug( LDAP_DEBUG_TRACE,
 749                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 750                         s, rc, c->c_connid );
 751
 752                 /* connections_mutex and c_mutex are locked */
 753                 connection_closing( c );
 754                 connection_close( c );
 755         }
 756
 757         connection_return( c );
 758         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 759         return 0;
 760 }
 761
 762 static int
 763 connection_input(
 764     Connection *conn
 765 )
 766 {
 767         Operation *op;
 768         ber_tag_t       tag;
 769         ber_len_t       len;
 770         ber_int_t       msgid;
 771         BerElement      *ber;
 772
 773         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 774             == NULL ) {
 775                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 776                 return -1;
 777         }
 778
 779         errno = 0;
 780         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 781             != LDAP_TAG_MESSAGE )
 782         {
 783                 int err = errno;
 784
 785                 Debug( LDAP_DEBUG_TRACE,
 786                         "ber_get_next on fd %d failed errno %d (%s)\n",
 787                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 788                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 789                 Debug( LDAP_DEBUG_TRACE,
 790                         "\t*** got %ld of %lu so far\n",
 791                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 792                         conn->c_currentber->ber_len, 0 );
 793
 794                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 795                         /* log, close and send error */
 796                         ber_free( conn->c_currentber, 1 );
 797                         conn->c_currentber = NULL;
 798
 799                         return -2;
 800                 }
 801                 return 1;
 802         }
 803
 804         ber = conn->c_currentber;
 805         conn->c_currentber = NULL;
 806
 807         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 808                 /* log, close and send error */
 809                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 810                     0 );
 811                 ber_free( ber, 1 );
 812                 return -1;
 813         }
 814
 815         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 816                 /* log, close and send error */
 817                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 818                     0 );
 819                 ber_free( ber, 1 );
 820
 821                 return -1;
 822         }
 823
 824         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 825
 826         if ( conn->c_conn_state == SLAP_C_BINDING
 827                 || conn->c_conn_state == SLAP_C_CLOSING )
 828         {
 829                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 830                 conn->c_n_ops_pending++;
 831                 slap_op_add( &conn->c_pending_ops, op );
 832
 833         } else {
 834                 conn->c_n_ops_executing++;
 835                 connection_op_activate( conn, op );
 836         }
 837
 838 #ifdef NO_THREADS
 839         if ( conn->c_struct_state != SLAP_C_USED ) {
 840                 /* connection must have got closed underneath us */
 841                 return 1;
 842         }
 843 #endif
 844         assert( conn->c_struct_state == SLAP_C_USED );
 845
 846         return 0;
 847 }
 848
 849 static int
 850 connection_resched( Connection *conn )
 851 {
 852         Operation *op;
 853
 854         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 855                 Debug( LDAP_DEBUG_TRACE,
 856                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 857                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 858
 859                 connection_close( conn );
 860                 return 0;
 861         }
 862
 863         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 864                 /* other states need different handling */
 865                 return 0;
 866         }
 867
 868         for( op = slap_op_pop( &conn->c_pending_ops );
 869                 op != NULL;
 870                 op = slap_op_pop( &conn->c_pending_ops ) )
 871         {
 872                 /* pending operations should not be marked for abandonment */
 873                 assert(!op->o_abandon);
 874
 875                 conn->c_n_ops_pending--;
 876                 conn->c_n_ops_executing++;
 877
 878                 connection_op_activate( conn, op );
 879
 880                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 881                         break;
 882                 }
 883         }
 884         return 0;
 885 }
 886
 887 static int connection_op_activate( Connection *conn, Operation *op )
 888 {
 889         struct co_arg *arg;
 890         char *tmpdn;
 891         int status;
 892         ber_tag_t tag = op->o_tag;
 893
 894         if ( conn->c_dn != NULL ) {
 895                 tmpdn = ch_strdup( conn->c_dn );
 896         } else {
 897                 tmpdn = NULL;
 898         }
 899
 900         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 901         arg->co_conn = conn;
 902         arg->co_op = op;
 903
 904         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 905         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 906
 907         arg->co_op->o_protocol = conn->c_protocol;
 908
 909         slap_op_add( &conn->c_ops, arg->co_op );
 910
 911         if(tag == LDAP_REQ_BIND) {
 912                 conn->c_conn_state = SLAP_C_BINDING;
 913         }
 914
 915         if ( tmpdn != NULL ) {
 916                 free( tmpdn );
 917         }
 918
 919         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 920         active_threads++;
 921         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 922
 923         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 924                                          connection_operation, (void *) arg );
 925
 926         if ( status != 0 ) {
 927                 Debug( LDAP_DEBUG_ANY,
 928                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 929
 930                 /* should move op to pending list */
 931         }
 932
 933         return status;
 934 }
 935
 936 int connection_write(ber_socket_t s)
 937 {
 938         Connection *c;
 939         assert( connections != NULL );
 940
 941         ldap_pvt_thread_mutex_lock( &connections_mutex );
 942
 943         c = connection_get( s );
 944
 945         slapd_clr_write( s, 0);
 946
 947         if( c == NULL ) {
 948                 Debug( LDAP_DEBUG_ANY,
 949                         "connection_write(%ld): no connection!\n",
 950                         (long) s, 0, 0 );
 951                 slapd_remove(s, 0);
 952                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 953                 return -1;
 954         }
 955
 956         c->c_n_write++;
 957
 958         Debug( LDAP_DEBUG_TRACE,
 959                 "connection_write(%d): waking output for id=%ld\n",
 960                 s, c->c_connid, 0 );
 961
 962         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 963
 964         connection_return( c );
 965         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 966         return 0;
 967 }