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 char* connection_state2str( int state ) {
  34         switch( state ) {
  35         case SLAP_C_INVALID:    return "!";
  36         case SLAP_C_INACTIVE:   return "|";
  37         case SLAP_C_ACTIVE:             return "";
  38         case SLAP_C_BINDING:    return "B";
  39         case SLAP_C_CLOSING:    return "C";
  40         }
  41
  42         return "?";
  43 }
  44
  45 static Connection* connection_get( ber_socket_t s );
  46
  47 static int connection_input( Connection *c );
  48 static void connection_close( Connection *c );
  49
  50 static int connection_op_activate( Connection *conn, Operation *op );
  51 static int connection_resched( Connection *conn );
  52 static void connection_abandon( Connection *conn );
  53 static void connection_destroy( Connection *c );
  54
  55 struct co_arg {
  56         Connection      *co_conn;
  57         Operation       *co_op;
  58 };
  59
  60 /*
  61  * Initialize connection management infrastructure.
  62  */
  63 int connections_init(void)
  64 {
  65         assert( connections == NULL );
  66
  67         if( connections != NULL) {
  68                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  69                         0, 0, 0 );
  70                 return -1;
  71         }
  72
  73         /* should check return of every call */
  74         ldap_pvt_thread_mutex_init( &connections_mutex );
  75
  76         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  77
  78         if( connections == NULL ) {
  79                 Debug( LDAP_DEBUG_ANY,
  80                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  81                         dtblsize, (long) sizeof(Connection), 0 );
  82                 return -1;
  83         }
  84
  85     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  86     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  87
  88         /*
  89          * per entry initialization of the Connection array initialization
  90          * will be done by connection_init()
  91          */
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * Destroy connection management infrastructure.
  98  */
  99 int connections_destroy(void)
 100 {
 101         ber_socket_t i;
 102
 103         /* should check return of every call */
 104
 105         if( connections == NULL) {
 106                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 107                         0, 0, 0 );
 108                 return -1;
 109         }
 110
 111         for ( i = 0; i < dtblsize; i++ ) {
 112                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 113                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 114                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 115                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 116                 }
 117         }
 118
 119         free( connections );
 120         connections = NULL;
 121
 122         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 123         return 0;
 124 }
 125
 126 /*
 127  * shutdown all connections
 128  */
 129 int connections_shutdown(void)
 130 {
 131         ber_socket_t i;
 132
 133         ldap_pvt_thread_mutex_lock( &connections_mutex );
 134
 135         for ( i = 0; i < dtblsize; i++ ) {
 136                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 137                         continue;
 138                 }
 139
 140                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 141
 142                 /* connections_mutex and c_mutex are locked */
 143                 connection_closing( &connections[i] );
 144                 connection_close( &connections[i] );
 145
 146                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 147         }
 148
 149         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 150
 151         return 0;
 152 }
 153
 154 /*
 155  * Timeout idle connections.
 156  */
 157 int connections_timeout_idle(time_t now)
 158 {
 159         int i = 0;
 160         int connindex;
 161         Connection* c;
 162
 163         ldap_pvt_thread_mutex_lock( &connections_mutex );
 164
 165         for( c = connection_first( &connindex );
 166                 c != NULL;
 167                 c = connection_next( c, &connindex ) )
 168         {
 169                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 170                         /* close it */
 171                         connection_closing( c );
 172                         connection_close( c );
 173                         i++;
 174                 }
 175         }
 176         connection_done( c );
 177
 178         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 179
 180         return i;
 181 }
 182
 183 static Connection* connection_get( ber_socket_t s )
 184 {
 185         /* connections_mutex should be locked by caller */
 186
 187         Connection *c;
 188
 189         Debug( LDAP_DEBUG_ARGS,
 190                 "connection_get(%ld)\n",
 191                 (long) s, 0, 0 );
 192
 193         assert( connections != NULL );
 194
 195         if(s == AC_SOCKET_INVALID) {
 196                 return NULL;
 197         }
 198
 199 #ifndef HAVE_WINSOCK
 200         c = &connections[s];
 201
 202         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 203
 204 #else
 205         c = NULL;
 206         {
 207                 ber_socket_t i;
 208
 209                 for(i=0; i<dtblsize; i++) {
 210                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 211                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 212                                 assert( connections[i].c_sb == 0 );
 213                                 break;
 214                         }
 215
 216                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 217                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 218                                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ) );
 219                                 continue;
 220                         }
 221
 222                         /* state can actually change from used -> unused by resched,
 223                          * so don't assert details here.
 224                          */
 225
 226                         if( ber_pvt_sb_get_desc( connections[i].c_sb ) == s ) {
 227                                 c = &connections[i];
 228                                 break;
 229                         }
 230                 }
 231         }
 232 #endif
 233
 234         if( c != NULL ) {
 235                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 236
 237                 if( c->c_struct_state != SLAP_C_USED ) {
 238                         /* connection must have been closed due to resched */
 239
 240                         assert( c->c_conn_state == SLAP_C_INVALID );
 241                         assert( !ber_pvt_sb_in_use( c->c_sb ) );
 242
 243                         Debug( LDAP_DEBUG_TRACE,
 244                                 "connection_get(%d): connection not used.\n",
 245                                 s, c->c_connid, 0 );
 246
 247                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 248                         return NULL;
 249                 }
 250
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "connection_get(%d): got connid=%ld\n",
 253                         s, c->c_connid, 0 );
 254
 255                 c->c_n_get++;
 256
 257                 assert( c->c_struct_state == SLAP_C_USED );
 258                 assert( c->c_conn_state != SLAP_C_INVALID );
 259                 assert( ber_pvt_sb_in_use( c->c_sb ) );
 260
 261         c->c_activitytime = slap_get_time();
 262         }
 263
 264         return c;
 265 }
 266
 267 static void connection_return( Connection *c )
 268 {
 269         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 270 }
 271
 272 long connection_init(
 273         ber_socket_t s,
 274         const char* name,
 275         const char* addr,
 276         int use_tls)
 277 {
 278         unsigned long id;
 279         Connection *c;
 280         assert( connections != NULL );
 281
 282         if( s == AC_SOCKET_INVALID ) {
 283         Debug( LDAP_DEBUG_ANY,
 284                         "connection_init(%ld): invalid.\n",
 285                         (long) s, 0, 0 );
 286                 return -1;
 287         }
 288
 289         assert( s >= 0 );
 290 #ifndef HAVE_WINSOCK
 291         assert( s < dtblsize );
 292 #endif
 293
 294         ldap_pvt_thread_mutex_lock( &connections_mutex );
 295
 296 #ifndef HAVE_WINSOCK
 297         c = &connections[s];
 298
 299 #else
 300         {
 301                 unsigned int i;
 302
 303                 c = NULL;
 304
 305         for( i=0; i < dtblsize; i++) {
 306             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 307                 assert( connections[i].c_sb == 0 );
 308                 c = &connections[i];
 309                 break;
 310             }
 311
 312             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 313                 assert( !ber_pvt_sb_in_use( connections[i].c_sb ));
 314                 c = &connections[i];
 315                 break;
 316             }
 317
 318             assert( connections[i].c_struct_state == SLAP_C_USED );
 319             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 320             assert( ber_pvt_sb_in_use( connections[i].c_sb ));
 321         }
 322
 323         if( c == NULL ) {
 324                 Debug( LDAP_DEBUG_ANY,
 325                                 "connection_init(%d): connection table full (%d/%d).\n",
 326                                 s, i, dtblsize);
 327             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 328             return -1;
 329         }
 330     }
 331 #endif
 332
 333     assert( c != NULL );
 334     assert( c->c_struct_state != SLAP_C_USED );
 335     assert( c->c_conn_state == SLAP_C_INVALID );
 336
 337     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 338         c->c_dn = NULL;
 339         c->c_cdn = NULL;
 340         c->c_client_name = NULL;
 341         c->c_client_addr = NULL;
 342         c->c_ops = NULL;
 343         c->c_pending_ops = NULL;
 344                 c->c_authmech = NULL;
 345                 c->c_authstate = NULL;
 346
 347         c->c_sb = ber_sockbuf_alloc( );
 348
 349         /* should check status of thread calls */
 350         ldap_pvt_thread_mutex_init( &c->c_mutex );
 351         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 352         ldap_pvt_thread_cond_init( &c->c_write_cv );
 353
 354         c->c_struct_state = SLAP_C_UNUSED;
 355     }
 356
 357     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 358
 359     assert( c->c_struct_state == SLAP_C_UNUSED );
 360     assert(     c->c_dn == NULL );
 361     assert(     c->c_cdn == NULL );
 362     assert( c->c_client_name == NULL );
 363     assert( c->c_client_addr == NULL );
 364     assert( c->c_ops == NULL );
 365     assert( c->c_pending_ops == NULL );
 366         assert( c->c_authmech == NULL );
 367         assert( c->c_authstate == NULL );
 368
 369     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 370     c->c_client_addr = ch_strdup( addr );
 371
 372     c->c_n_ops_received = 0;
 373     c->c_n_ops_executing = 0;
 374     c->c_n_ops_pending = 0;
 375     c->c_n_ops_completed = 0;
 376
 377         c->c_n_get = 0;
 378         c->c_n_read = 0;
 379         c->c_n_write = 0;
 380
 381     c->c_activitytime = c->c_starttime = slap_get_time();
 382
 383     ber_pvt_sb_set_desc( c->c_sb, s );
 384     ber_pvt_sb_set_io( c->c_sb, &ber_pvt_sb_io_tcp, NULL );
 385
 386     if( ber_pvt_sb_set_nonblock( c->c_sb, 1 ) < 0 ) {
 387         Debug( LDAP_DEBUG_ANY,
 388             "connection_init(%d, %s, %s): set nonblocking failed\n",
 389             s, c->c_client_name, c->c_client_addr);
 390     }
 391
 392     id = c->c_connid = conn_nextid++;
 393
 394     c->c_conn_state = SLAP_C_INACTIVE;
 395     c->c_struct_state = SLAP_C_USED;
 396
 397 #ifdef HAVE_TLS
 398     if ( use_tls ) {
 399             /* FIXME: >0 means incomplete read */
 400             if ( ldap_pvt_tls_accept( c->c_sb, NULL ) < 0 ) {
 401                     Debug( LDAP_DEBUG_ANY,
 402                            "connection_init(%d): TLS accept failed.\n",
 403                                 s, 0, 0);
 404                     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 405                     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 406                     connection_destroy( c );
 407                     return -1;
 408             }
 409     }
 410 #endif
 411
 412     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 413     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 414
 415     backend_connection_init(c);
 416
 417     return id;
 418 }
 419
 420 static void
 421 connection_destroy( Connection *c )
 422 {
 423         /* note: connections_mutex should be locked by caller */
 424
 425     assert( connections != NULL );
 426     assert( c != NULL );
 427     assert( c->c_struct_state != SLAP_C_UNUSED );
 428     assert( c->c_conn_state != SLAP_C_INVALID );
 429     assert( c->c_ops == NULL );
 430
 431     backend_connection_destroy(c);
 432
 433     c->c_protocol = 0;
 434
 435     c->c_activitytime = c->c_starttime = 0;
 436
 437     if(c->c_dn != NULL) {
 438         free(c->c_dn);
 439         c->c_dn = NULL;
 440     }
 441         if(c->c_cdn != NULL) {
 442                 free(c->c_cdn);
 443                 c->c_cdn = NULL;
 444         }
 445         if(c->c_client_name != NULL) {
 446                 free(c->c_client_name);
 447                 c->c_client_name = NULL;
 448         }
 449         if(c->c_client_addr != NULL) {
 450                 free(c->c_client_addr);
 451                 c->c_client_addr = NULL;
 452         }
 453         if(c->c_authmech != NULL ) {
 454                 free(c->c_authmech);
 455                 c->c_authmech = NULL;
 456         }
 457         if(c->c_authstate != NULL ) {
 458                 free(c->c_authstate);
 459                 c->c_authstate = NULL;
 460         }
 461
 462         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 463                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 464
 465                 slapd_remove( sd, 0 );
 466                 ber_pvt_sb_close( c->c_sb );
 467
 468                 Statslog( LDAP_DEBUG_STATS,
 469                     "conn=%d fd=%d closed.\n",
 470                         c->c_connid, sd, 0, 0, 0 );
 471         }
 472
 473         ber_pvt_sb_destroy( c->c_sb );
 474
 475     c->c_conn_state = SLAP_C_INVALID;
 476     c->c_struct_state = SLAP_C_UNUSED;
 477 }
 478
 479 int connection_state_closing( Connection *c )
 480 {
 481         /* c_mutex must be locked by caller */
 482
 483         int state;
 484         assert( c != NULL );
 485         assert( c->c_struct_state == SLAP_C_USED );
 486
 487         state = c->c_conn_state;
 488
 489         assert( state != SLAP_C_INVALID );
 490
 491         return state == SLAP_C_CLOSING;
 492 }
 493
 494 static void connection_abandon( Connection *c )
 495 {
 496         /* c_mutex must be locked by caller */
 497
 498         Operation *o;
 499
 500         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 501                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 502                 o->o_abandon = 1;
 503                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 504         }
 505
 506         /* remove pending operations */
 507         for( o = slap_op_pop( &c->c_pending_ops );
 508                 o != NULL;
 509                 o = slap_op_pop( &c->c_pending_ops ) )
 510         {
 511                 slap_op_free( o );
 512         }
 513 }
 514
 515 void connection_closing( Connection *c )
 516 {
 517         assert( connections != NULL );
 518         assert( c != NULL );
 519         assert( c->c_struct_state == SLAP_C_USED );
 520         assert( c->c_conn_state != SLAP_C_INVALID );
 521
 522         /* c_mutex must be locked by caller */
 523
 524         if( c->c_conn_state != SLAP_C_CLOSING ) {
 525
 526                 Debug( LDAP_DEBUG_TRACE,
 527                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 528                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 529
 530                 /* update state to closing */
 531                 c->c_conn_state = SLAP_C_CLOSING;
 532
 533                 /* don't listen on this port anymore */
 534                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 535
 536                 /* shutdown I/O -- not yet implemented */
 537
 538                 /* abandon active operations */
 539                 connection_abandon( c );
 540
 541                 /* wake write blocked operations */
 542                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 543                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 544         }
 545 }
 546
 547 static void connection_close( Connection *c )
 548 {
 549         assert( connections != NULL );
 550         assert( c != NULL );
 551         assert( c->c_struct_state == SLAP_C_USED );
 552         assert( c->c_conn_state == SLAP_C_CLOSING );
 553
 554         /* note: connections_mutex and c_mutex should be locked by caller */
 555
 556         if( c->c_ops != NULL ) {
 557                 Debug( LDAP_DEBUG_TRACE,
 558                         "connection_close: deferring conn=%ld sd=%d.\n",
 559                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 560
 561                 return;
 562         }
 563
 564         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 565                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 566
 567         connection_destroy( c );
 568 }
 569
 570 unsigned long connections_nextid(void)
 571 {
 572         unsigned long id;
 573         assert( connections != NULL );
 574
 575         ldap_pvt_thread_mutex_lock( &connections_mutex );
 576
 577         id = conn_nextid;
 578
 579         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 580
 581         return id;
 582 }
 583
 584 Connection* connection_first( ber_socket_t *index )
 585 {
 586         assert( connections != NULL );
 587         assert( index != NULL );
 588
 589         ldap_pvt_thread_mutex_lock( &connections_mutex );
 590
 591         *index = 0;
 592
 593         return connection_next(NULL, index);
 594 }
 595
 596 Connection* connection_next( Connection *c, ber_socket_t *index )
 597 {
 598         assert( connections != NULL );
 599         assert( index != NULL );
 600         assert( *index <= dtblsize );
 601
 602         if( c != NULL ) {
 603                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 604         }
 605
 606         c = NULL;
 607
 608         for(; *index < dtblsize; (*index)++) {
 609                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 610                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 611 #ifndef HAVE_WINSOCK
 612                         continue;
 613 #else
 614                         break;
 615 #endif
 616                 }
 617
 618                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 619                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 620                         c = &connections[(*index)++];
 621                         break;
 622                 }
 623
 624                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 625                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 626         }
 627
 628         if( c != NULL ) {
 629                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 630         }
 631
 632         return c;
 633 }
 634
 635 void connection_done( Connection *c )
 636 {
 637         assert( connections != NULL );
 638
 639         if( c != NULL ) {
 640                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 641         }
 642
 643         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 644 }
 645
 646 /*
 647  * connection_activity - handle the request operation op on connection
 648  * conn.  This routine figures out what kind of operation it is and
 649  * calls the appropriate stub to handle it.
 650  */
 651
 652 static void *
 653 connection_operation( void *arg_v )
 654 {
 655         int rc;
 656         struct co_arg   *arg = arg_v;
 657         ber_tag_t tag = arg->co_op->o_tag;
 658         Connection *conn = arg->co_conn;
 659
 660         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 661         num_ops_initiated++;
 662         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 663
 664         switch ( tag ) {
 665         case LDAP_REQ_BIND:
 666                 rc = do_bind( conn, arg->co_op );
 667                 break;
 668
 669         case LDAP_REQ_UNBIND:
 670                 rc = do_unbind( conn, arg->co_op );
 671                 break;
 672
 673         case LDAP_REQ_ADD:
 674                 rc = do_add( conn, arg->co_op );
 675                 break;
 676
 677         case LDAP_REQ_DELETE:
 678                 rc = do_delete( conn, arg->co_op );
 679                 break;
 680
 681         case LDAP_REQ_MODRDN:
 682                 rc = do_modrdn( conn, arg->co_op );
 683                 break;
 684
 685         case LDAP_REQ_MODIFY:
 686                 rc = do_modify( conn, arg->co_op );
 687                 break;
 688
 689         case LDAP_REQ_COMPARE:
 690                 rc = do_compare( conn, arg->co_op );
 691                 break;
 692
 693         case LDAP_REQ_SEARCH:
 694                 rc = do_search( conn, arg->co_op );
 695                 break;
 696
 697         case LDAP_REQ_ABANDON:
 698                 rc = do_abandon( conn, arg->co_op );
 699                 break;
 700
 701         case LDAP_REQ_EXTENDED:
 702                 rc = do_extended( conn, arg->co_op );
 703                 break;
 704
 705         default:
 706                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 707                     tag, 0, 0 );
 708                 arg->co_op->o_tag = LBER_ERROR;
 709                 send_ldap_disconnect( conn, arg->co_op,
 710                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 711                 rc = -1;
 712                 break;
 713         }
 714
 715         if( rc == -1 ) tag = LBER_ERROR;
 716
 717         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 718         num_ops_completed++;
 719         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 720
 721         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 722
 723         conn->c_n_ops_executing--;
 724         conn->c_n_ops_completed++;
 725
 726         slap_op_remove( &conn->c_ops, arg->co_op );
 727         slap_op_free( arg->co_op );
 728         arg->co_op = NULL;
 729         arg->co_conn = NULL;
 730         free( (char *) arg );
 731         arg = NULL;
 732
 733         switch( tag ) {
 734         case LBER_ERROR:
 735         case LDAP_REQ_UNBIND:
 736                 /* c_mutex is locked */
 737                 connection_closing( conn );
 738                 break;
 739
 740         case LDAP_REQ_BIND:
 741                 if( conn->c_conn_state == SLAP_C_BINDING) {
 742                         conn->c_conn_state = SLAP_C_ACTIVE;
 743                 }
 744                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 745         }
 746
 747         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 748         active_threads--;
 749         if( active_threads < 1 ) {
 750                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 751         }
 752         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 753
 754         connection_resched( conn );
 755
 756         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 757
 758         return NULL;
 759 }
 760
 761 int connection_read(ber_socket_t s)
 762 {
 763         int rc = 0;
 764         Connection *c;
 765         assert( connections != NULL );
 766
 767         ldap_pvt_thread_mutex_lock( &connections_mutex );
 768
 769         /* get (locked) connection */
 770         c = connection_get( s );
 771
 772         if( c == NULL ) {
 773                 Debug( LDAP_DEBUG_ANY,
 774                         "connection_read(%ld): no connection!\n",
 775                         (long) s, 0, 0 );
 776
 777                 slapd_remove(s, 0);
 778
 779                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 780                 return -1;
 781         }
 782
 783         c->c_n_read++;
 784
 785         if( c->c_conn_state == SLAP_C_CLOSING ) {
 786                 Debug( LDAP_DEBUG_TRACE,
 787                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 788                         s, c->c_connid, 0 );
 789
 790                 connection_return( c );
 791                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 792                 return 0;
 793         }
 794
 795         Debug( LDAP_DEBUG_TRACE,
 796                 "connection_read(%d): checking for input on id=%ld\n",
 797                 s, c->c_connid, 0 );
 798
 799 #define CONNECTION_INPUT_LOOP 1
 800
 801 #ifdef DATA_READY_LOOP
 802         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 803 #elif CONNECTION_INPUT_LOOP
 804         while(!rc)
 805 #endif
 806         {
 807                 rc = connection_input( c );
 808         }
 809
 810         if( rc < 0 ) {
 811                 Debug( LDAP_DEBUG_TRACE,
 812                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 813                         s, rc, c->c_connid );
 814
 815                 /* connections_mutex and c_mutex are locked */
 816                 connection_closing( c );
 817                 connection_close( c );
 818         }
 819
 820         connection_return( c );
 821         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 822         return 0;
 823 }
 824
 825 static int
 826 connection_input(
 827     Connection *conn
 828 )
 829 {
 830         Operation *op;
 831         ber_tag_t       tag;
 832         ber_len_t       len;
 833         ber_int_t       msgid;
 834         BerElement      *ber;
 835
 836         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 837             == NULL ) {
 838                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 839                 return -1;
 840         }
 841
 842         errno = 0;
 843         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 844             != LDAP_TAG_MESSAGE )
 845         {
 846                 int err = errno;
 847
 848                 Debug( LDAP_DEBUG_TRACE,
 849                         "ber_get_next on fd %d failed errno %d (%s)\n",
 850                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 851                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 852                 Debug( LDAP_DEBUG_TRACE,
 853                         "\t*** got %ld of %lu so far\n",
 854                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 855                         conn->c_currentber->ber_len, 0 );
 856
 857                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 858                         /* log, close and send error */
 859                         ber_free( conn->c_currentber, 1 );
 860                         conn->c_currentber = NULL;
 861
 862                         return -2;
 863                 }
 864                 return 1;
 865         }
 866
 867         ber = conn->c_currentber;
 868         conn->c_currentber = NULL;
 869
 870         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 871                 /* log, close and send error */
 872                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 873                     0 );
 874                 ber_free( ber, 1 );
 875                 return -1;
 876         }
 877
 878         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 879                 /* log, close and send error */
 880                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 881                     0 );
 882                 ber_free( ber, 1 );
 883
 884                 return -1;
 885         }
 886
 887         if(tag == LDAP_REQ_BIND) {
 888                 /* immediately abandon all exiting operations upon BIND */
 889                 connection_abandon( conn );
 890         }
 891
 892         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 893
 894         if ( conn->c_conn_state == SLAP_C_BINDING
 895                 || conn->c_conn_state == SLAP_C_CLOSING )
 896         {
 897                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 898                 conn->c_n_ops_pending++;
 899                 slap_op_add( &conn->c_pending_ops, op );
 900
 901         } else {
 902                 conn->c_n_ops_executing++;
 903                 connection_op_activate( conn, op );
 904         }
 905
 906 #ifdef NO_THREADS
 907         if ( conn->c_struct_state != SLAP_C_USED ) {
 908                 /* connection must have got closed underneath us */
 909                 return 1;
 910         }
 911 #endif
 912         assert( conn->c_struct_state == SLAP_C_USED );
 913
 914         return 0;
 915 }
 916
 917 static int
 918 connection_resched( Connection *conn )
 919 {
 920         Operation *op;
 921
 922         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 923                 Debug( LDAP_DEBUG_TRACE,
 924                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 925                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 926
 927                 connection_close( conn );
 928                 return 0;
 929         }
 930
 931         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 932                 /* other states need different handling */
 933                 return 0;
 934         }
 935
 936         for( op = slap_op_pop( &conn->c_pending_ops );
 937                 op != NULL;
 938                 op = slap_op_pop( &conn->c_pending_ops ) )
 939         {
 940                 /* pending operations should not be marked for abandonment */
 941                 assert(!op->o_abandon);
 942
 943                 conn->c_n_ops_pending--;
 944                 conn->c_n_ops_executing++;
 945
 946                 connection_op_activate( conn, op );
 947
 948                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 949                         break;
 950                 }
 951         }
 952         return 0;
 953 }
 954
 955 static int connection_op_activate( Connection *conn, Operation *op )
 956 {
 957         struct co_arg *arg;
 958         char *tmpdn;
 959         int status;
 960         ber_tag_t tag = op->o_tag;
 961
 962         if(tag == LDAP_REQ_BIND) {
 963                 conn->c_conn_state = SLAP_C_BINDING;
 964         }
 965
 966         if ( conn->c_dn != NULL ) {
 967                 tmpdn = ch_strdup( conn->c_dn );
 968         } else {
 969                 tmpdn = NULL;
 970         }
 971
 972         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 973         arg->co_conn = conn;
 974         arg->co_op = op;
 975
 976         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
 977
 978         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 979         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 980
 981         arg->co_op->o_protocol = conn->c_protocol;
 982
 983         arg->co_op->o_authtype = conn->c_authtype;
 984         arg->co_op->o_authmech = conn->c_authmech != NULL
 985                 ?  ch_strdup( conn->c_authmech ) : NULL;
 986
 987         slap_op_add( &conn->c_ops, arg->co_op );
 988
 989         if( tmpdn != NULL ) {
 990                 free( tmpdn );
 991         }
 992
 993         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 994         active_threads++;
 995         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 996
 997         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 998                                          connection_operation, (void *) arg );
 999
1000         if ( status != 0 ) {
1001                 Debug( LDAP_DEBUG_ANY,
1002                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1003
1004                 /* should move op to pending list */
1005         }
1006
1007         return status;
1008 }
1009
1010 int connection_write(ber_socket_t s)
1011 {
1012         Connection *c;
1013         assert( connections != NULL );
1014
1015         ldap_pvt_thread_mutex_lock( &connections_mutex );
1016
1017         c = connection_get( s );
1018
1019         slapd_clr_write( s, 0);
1020
1021         if( c == NULL ) {
1022                 Debug( LDAP_DEBUG_ANY,
1023                         "connection_write(%ld): no connection!\n",
1024                         (long) s, 0, 0 );
1025                 slapd_remove(s, 0);
1026                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1027                 return -1;
1028         }
1029
1030         c->c_n_write++;
1031
1032         Debug( LDAP_DEBUG_TRACE,
1033                 "connection_write(%d): waking output for id=%ld\n",
1034                 s, c->c_connid, 0 );
1035
1036         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1037
1038         connection_return( c );
1039         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1040         return 0;
1041 }