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