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     if ( use_tls ) {
 398             c->c_is_tls = 1;
 399             c->c_needs_tls_accept = 1;
 400     }
 401
 402     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 403     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 404
 405     backend_connection_init(c);
 406
 407     return id;
 408 }
 409
 410 static void
 411 connection_destroy( Connection *c )
 412 {
 413         /* note: connections_mutex should be locked by caller */
 414
 415     assert( connections != NULL );
 416     assert( c != NULL );
 417     assert( c->c_struct_state != SLAP_C_UNUSED );
 418     assert( c->c_conn_state != SLAP_C_INVALID );
 419     assert( c->c_ops == NULL );
 420
 421     backend_connection_destroy(c);
 422
 423     c->c_protocol = 0;
 424     c->c_connid = -1;
 425
 426     c->c_activitytime = c->c_starttime = 0;
 427
 428     if(c->c_dn != NULL) {
 429         free(c->c_dn);
 430         c->c_dn = NULL;
 431     }
 432         if(c->c_cdn != NULL) {
 433                 free(c->c_cdn);
 434                 c->c_cdn = NULL;
 435         }
 436         if(c->c_client_name != NULL) {
 437                 free(c->c_client_name);
 438                 c->c_client_name = NULL;
 439         }
 440         if(c->c_client_addr != NULL) {
 441                 free(c->c_client_addr);
 442                 c->c_client_addr = NULL;
 443         }
 444         if(c->c_authmech != NULL ) {
 445                 free(c->c_authmech);
 446                 c->c_authmech = NULL;
 447         }
 448         if(c->c_authstate != NULL ) {
 449                 free(c->c_authstate);
 450                 c->c_authstate = NULL;
 451         }
 452
 453         if ( ber_pvt_sb_in_use(c->c_sb) ) {
 454                 int sd = ber_pvt_sb_get_desc(c->c_sb);
 455
 456                 slapd_remove( sd, 0 );
 457                 ber_pvt_sb_close( c->c_sb );
 458
 459                 Statslog( LDAP_DEBUG_STATS,
 460                     "conn=%d fd=%d closed.\n",
 461                         c->c_connid, sd, 0, 0, 0 );
 462         }
 463
 464         ber_pvt_sb_destroy( c->c_sb );
 465
 466     c->c_conn_state = SLAP_C_INVALID;
 467     c->c_struct_state = SLAP_C_UNUSED;
 468 }
 469
 470 int connection_state_closing( Connection *c )
 471 {
 472         /* c_mutex must be locked by caller */
 473
 474         int state;
 475         assert( c != NULL );
 476         assert( c->c_struct_state == SLAP_C_USED );
 477
 478         state = c->c_conn_state;
 479
 480         assert( state != SLAP_C_INVALID );
 481
 482         return state == SLAP_C_CLOSING;
 483 }
 484
 485 static void connection_abandon( Connection *c )
 486 {
 487         /* c_mutex must be locked by caller */
 488
 489         Operation *o;
 490
 491         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 492                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 493                 o->o_abandon = 1;
 494                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 495         }
 496
 497         /* remove pending operations */
 498         for( o = slap_op_pop( &c->c_pending_ops );
 499                 o != NULL;
 500                 o = slap_op_pop( &c->c_pending_ops ) )
 501         {
 502                 slap_op_free( o );
 503         }
 504 }
 505
 506 void connection_closing( Connection *c )
 507 {
 508         assert( connections != NULL );
 509         assert( c != NULL );
 510         assert( c->c_struct_state == SLAP_C_USED );
 511         assert( c->c_conn_state != SLAP_C_INVALID );
 512
 513         /* c_mutex must be locked by caller */
 514
 515         if( c->c_conn_state != SLAP_C_CLOSING ) {
 516
 517                 Debug( LDAP_DEBUG_TRACE,
 518                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 519                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 520
 521                 /* update state to closing */
 522                 c->c_conn_state = SLAP_C_CLOSING;
 523
 524                 /* don't listen on this port anymore */
 525                 slapd_clr_read( ber_pvt_sb_get_desc( c->c_sb ), 1 );
 526
 527                 /* shutdown I/O -- not yet implemented */
 528
 529                 /* abandon active operations */
 530                 connection_abandon( c );
 531
 532                 /* wake write blocked operations */
 533                 slapd_clr_write( ber_pvt_sb_get_desc(c->c_sb), 1 );
 534                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 535         }
 536 }
 537
 538 static void connection_close( Connection *c )
 539 {
 540         assert( connections != NULL );
 541         assert( c != NULL );
 542         assert( c->c_struct_state == SLAP_C_USED );
 543         assert( c->c_conn_state == SLAP_C_CLOSING );
 544
 545         /* note: connections_mutex and c_mutex should be locked by caller */
 546
 547         if( c->c_ops != NULL ) {
 548                 Debug( LDAP_DEBUG_TRACE,
 549                         "connection_close: deferring conn=%ld sd=%d.\n",
 550                         c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 551
 552                 return;
 553         }
 554
 555         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 556                 c->c_connid, ber_pvt_sb_get_desc( c->c_sb ), 0 );
 557
 558         connection_destroy( c );
 559 }
 560
 561 unsigned long connections_nextid(void)
 562 {
 563         unsigned long id;
 564         assert( connections != NULL );
 565
 566         ldap_pvt_thread_mutex_lock( &connections_mutex );
 567
 568         id = conn_nextid;
 569
 570         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 571
 572         return id;
 573 }
 574
 575 Connection* connection_first( ber_socket_t *index )
 576 {
 577         assert( connections != NULL );
 578         assert( index != NULL );
 579
 580         ldap_pvt_thread_mutex_lock( &connections_mutex );
 581
 582         *index = 0;
 583
 584         return connection_next(NULL, index);
 585 }
 586
 587 Connection* connection_next( Connection *c, ber_socket_t *index )
 588 {
 589         assert( connections != NULL );
 590         assert( index != NULL );
 591         assert( *index <= dtblsize );
 592
 593         if( c != NULL ) {
 594                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 595         }
 596
 597         c = NULL;
 598
 599         for(; *index < dtblsize; (*index)++) {
 600                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 601                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 602 #ifndef HAVE_WINSOCK
 603                         continue;
 604 #else
 605                         break;
 606 #endif
 607                 }
 608
 609                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 610                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 611                         c = &connections[(*index)++];
 612                         break;
 613                 }
 614
 615                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 616                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 617         }
 618
 619         if( c != NULL ) {
 620                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 621         }
 622
 623         return c;
 624 }
 625
 626 void connection_done( Connection *c )
 627 {
 628         assert( connections != NULL );
 629
 630         if( c != NULL ) {
 631                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 632         }
 633
 634         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 635 }
 636
 637 /*
 638  * connection_activity - handle the request operation op on connection
 639  * conn.  This routine figures out what kind of operation it is and
 640  * calls the appropriate stub to handle it.
 641  */
 642
 643 static void *
 644 connection_operation( void *arg_v )
 645 {
 646         int rc;
 647         struct co_arg   *arg = arg_v;
 648         ber_tag_t tag = arg->co_op->o_tag;
 649         Connection *conn = arg->co_conn;
 650
 651         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 652         num_ops_initiated++;
 653         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 654
 655         switch ( tag ) {
 656         case LDAP_REQ_BIND:
 657                 rc = do_bind( conn, arg->co_op );
 658                 break;
 659
 660         case LDAP_REQ_UNBIND:
 661                 rc = do_unbind( conn, arg->co_op );
 662                 break;
 663
 664         case LDAP_REQ_ADD:
 665                 rc = do_add( conn, arg->co_op );
 666                 break;
 667
 668         case LDAP_REQ_DELETE:
 669                 rc = do_delete( conn, arg->co_op );
 670                 break;
 671
 672         case LDAP_REQ_MODRDN:
 673                 rc = do_modrdn( conn, arg->co_op );
 674                 break;
 675
 676         case LDAP_REQ_MODIFY:
 677                 rc = do_modify( conn, arg->co_op );
 678                 break;
 679
 680         case LDAP_REQ_COMPARE:
 681                 rc = do_compare( conn, arg->co_op );
 682                 break;
 683
 684         case LDAP_REQ_SEARCH:
 685                 rc = do_search( conn, arg->co_op );
 686                 break;
 687
 688         case LDAP_REQ_ABANDON:
 689                 rc = do_abandon( conn, arg->co_op );
 690                 break;
 691
 692         case LDAP_REQ_EXTENDED:
 693                 rc = do_extended( conn, arg->co_op );
 694                 break;
 695
 696         default:
 697                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 698                     tag, 0, 0 );
 699                 arg->co_op->o_tag = LBER_ERROR;
 700                 send_ldap_disconnect( conn, arg->co_op,
 701                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 702                 rc = -1;
 703                 break;
 704         }
 705
 706         if( rc == -1 ) tag = LBER_ERROR;
 707
 708         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 709         num_ops_completed++;
 710         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 711
 712         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 713
 714         conn->c_n_ops_executing--;
 715         conn->c_n_ops_completed++;
 716
 717         slap_op_remove( &conn->c_ops, arg->co_op );
 718         slap_op_free( arg->co_op );
 719         arg->co_op = NULL;
 720         arg->co_conn = NULL;
 721         free( (char *) arg );
 722         arg = NULL;
 723
 724         switch( tag ) {
 725         case LBER_ERROR:
 726         case LDAP_REQ_UNBIND:
 727                 /* c_mutex is locked */
 728                 connection_closing( conn );
 729                 break;
 730
 731         case LDAP_REQ_BIND:
 732                 if( conn->c_conn_state == SLAP_C_BINDING) {
 733                         conn->c_conn_state = SLAP_C_ACTIVE;
 734                 }
 735                 conn->c_bind_in_progress = ( rc == LDAP_SASL_BIND_IN_PROGRESS );
 736         }
 737
 738         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 739         active_threads--;
 740         if( active_threads < 1 ) {
 741                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 742         }
 743         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 744
 745         connection_resched( conn );
 746
 747         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 748
 749         return NULL;
 750 }
 751
 752 int connection_read(ber_socket_t s)
 753 {
 754         int rc = 0;
 755         Connection *c;
 756         assert( connections != NULL );
 757
 758         ldap_pvt_thread_mutex_lock( &connections_mutex );
 759
 760         /* get (locked) connection */
 761         c = connection_get( s );
 762
 763         if( c == NULL ) {
 764                 Debug( LDAP_DEBUG_ANY,
 765                         "connection_read(%ld): no connection!\n",
 766                         (long) s, 0, 0 );
 767
 768                 slapd_remove(s, 0);
 769
 770                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 771                 return -1;
 772         }
 773
 774         c->c_n_read++;
 775
 776         if( c->c_conn_state == SLAP_C_CLOSING ) {
 777                 Debug( LDAP_DEBUG_TRACE,
 778                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 779                         s, c->c_connid, 0 );
 780
 781                 connection_return( c );
 782                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 783                 return 0;
 784         }
 785
 786         Debug( LDAP_DEBUG_TRACE,
 787                 "connection_read(%d): checking for input on id=%ld\n",
 788                 s, c->c_connid, 0 );
 789
 790 #ifdef HAVE_TLS
 791         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 792                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 793                 if ( rc < 0 ) {
 794                         Debug( LDAP_DEBUG_TRACE,
 795                                "connection_read(%d): TLS accept error error=%d id=%ld, closing.\n",
 796                                s, rc, c->c_connid );
 797
 798                         c->c_needs_tls_accept = 0;
 799                         /* connections_mutex and c_mutex are locked */
 800                         connection_closing( c );
 801                         connection_close( c );
 802                 } else if ( rc == 0 ) {
 803                         c->c_needs_tls_accept = 0;
 804                 }
 805                 connection_return( c );
 806                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 807                 return 0;
 808         }
 809 #endif
 810
 811 #define CONNECTION_INPUT_LOOP 1
 812
 813 #ifdef DATA_READY_LOOP
 814         while(!rc && ber_pvt_sb_data_ready(&c->c_sb))
 815 #elif CONNECTION_INPUT_LOOP
 816         while(!rc)
 817 #endif
 818         {
 819                 rc = connection_input( c );
 820         }
 821
 822         if( rc < 0 ) {
 823                 Debug( LDAP_DEBUG_TRACE,
 824                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 825                         s, rc, c->c_connid );
 826
 827                 /* connections_mutex and c_mutex are locked */
 828                 connection_closing( c );
 829                 connection_close( c );
 830         }
 831
 832         connection_return( c );
 833         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 834         return 0;
 835 }
 836
 837 static int
 838 connection_input(
 839     Connection *conn
 840 )
 841 {
 842         Operation *op;
 843         ber_tag_t       tag;
 844         ber_len_t       len;
 845         ber_int_t       msgid;
 846         BerElement      *ber;
 847
 848         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 849             == NULL ) {
 850                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 851                 return -1;
 852         }
 853
 854         errno = 0;
 855         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 856             != LDAP_TAG_MESSAGE )
 857         {
 858                 int err = errno;
 859
 860                 Debug( LDAP_DEBUG_TRACE,
 861                         "ber_get_next on fd %d failed errno %d (%s)\n",
 862                         ber_pvt_sb_get_desc( conn->c_sb ), err,
 863                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 864                 Debug( LDAP_DEBUG_TRACE,
 865                         "\t*** got %ld of %lu so far\n",
 866                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 867                         conn->c_currentber->ber_len, 0 );
 868
 869                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 870                         /* log, close and send error */
 871                         ber_free( conn->c_currentber, 1 );
 872                         conn->c_currentber = NULL;
 873
 874                         return -2;
 875                 }
 876                 return 1;
 877         }
 878
 879         ber = conn->c_currentber;
 880         conn->c_currentber = NULL;
 881
 882         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 883                 /* log, close and send error */
 884                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 885                     0 );
 886                 ber_free( ber, 1 );
 887                 return -1;
 888         }
 889
 890         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 891                 /* log, close and send error */
 892                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 893                     0 );
 894                 ber_free( ber, 1 );
 895
 896                 return -1;
 897         }
 898
 899         if(tag == LDAP_REQ_BIND) {
 900                 /* immediately abandon all exiting operations upon BIND */
 901                 connection_abandon( conn );
 902         }
 903
 904         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 905
 906         if ( conn->c_conn_state == SLAP_C_BINDING
 907                 || conn->c_conn_state == SLAP_C_CLOSING )
 908         {
 909                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 910                 conn->c_n_ops_pending++;
 911                 slap_op_add( &conn->c_pending_ops, op );
 912
 913         } else {
 914                 conn->c_n_ops_executing++;
 915                 connection_op_activate( conn, op );
 916         }
 917
 918 #ifdef NO_THREADS
 919         if ( conn->c_struct_state != SLAP_C_USED ) {
 920                 /* connection must have got closed underneath us */
 921                 return 1;
 922         }
 923 #endif
 924         assert( conn->c_struct_state == SLAP_C_USED );
 925
 926         return 0;
 927 }
 928
 929 static int
 930 connection_resched( Connection *conn )
 931 {
 932         Operation *op;
 933
 934         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 935                 Debug( LDAP_DEBUG_TRACE,
 936                         "connection_resched: attempting closing conn=%ld sd=%d.\n",
 937                         conn->c_connid, ber_pvt_sb_get_desc( conn->c_sb ), 0 );
 938
 939                 connection_close( conn );
 940                 return 0;
 941         }
 942
 943         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 944                 /* other states need different handling */
 945                 return 0;
 946         }
 947
 948         for( op = slap_op_pop( &conn->c_pending_ops );
 949                 op != NULL;
 950                 op = slap_op_pop( &conn->c_pending_ops ) )
 951         {
 952                 /* pending operations should not be marked for abandonment */
 953                 assert(!op->o_abandon);
 954
 955                 conn->c_n_ops_pending--;
 956                 conn->c_n_ops_executing++;
 957
 958                 connection_op_activate( conn, op );
 959
 960                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 961                         break;
 962                 }
 963         }
 964         return 0;
 965 }
 966
 967 static int connection_op_activate( Connection *conn, Operation *op )
 968 {
 969         struct co_arg *arg;
 970         char *tmpdn;
 971         int status;
 972         ber_tag_t tag = op->o_tag;
 973
 974         if(tag == LDAP_REQ_BIND) {
 975                 conn->c_conn_state = SLAP_C_BINDING;
 976         }
 977
 978         if ( conn->c_dn != NULL ) {
 979                 tmpdn = ch_strdup( conn->c_dn );
 980         } else {
 981                 tmpdn = NULL;
 982         }
 983
 984         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 985         arg->co_conn = conn;
 986         arg->co_op = op;
 987
 988         arg->co_op->o_bind_in_progress = conn->c_bind_in_progress;
 989
 990         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 991         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 992
 993         arg->co_op->o_protocol = conn->c_protocol;
 994         arg->co_op->o_connid = conn->c_connid;
 995
 996         arg->co_op->o_authtype = conn->c_authtype;
 997         arg->co_op->o_authmech = conn->c_authmech != NULL
 998                 ?  ch_strdup( conn->c_authmech ) : NULL;
 999
1000         slap_op_add( &conn->c_ops, arg->co_op );
1001
1002         if( tmpdn != NULL ) {
1003                 free( tmpdn );
1004         }
1005
1006         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1007         active_threads++;
1008         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1009
1010         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
1011                                          connection_operation, (void *) arg );
1012
1013         if ( status != 0 ) {
1014                 Debug( LDAP_DEBUG_ANY,
1015                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1016
1017                 /* should move op to pending list */
1018         }
1019
1020         return status;
1021 }
1022
1023 int connection_write(ber_socket_t s)
1024 {
1025         Connection *c;
1026         assert( connections != NULL );
1027
1028         ldap_pvt_thread_mutex_lock( &connections_mutex );
1029
1030         c = connection_get( s );
1031
1032         slapd_clr_write( s, 0);
1033
1034         if( c == NULL ) {
1035                 Debug( LDAP_DEBUG_ANY,
1036                         "connection_write(%ld): no connection!\n",
1037                         (long) s, 0, 0 );
1038                 slapd_remove(s, 0);
1039                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1040                 return -1;
1041         }
1042
1043         c->c_n_write++;
1044
1045         Debug( LDAP_DEBUG_TRACE,
1046                 "connection_write(%d): waking output for id=%ld\n",
1047                 s, c->c_connid, 0 );
1048
1049         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1050
1051         connection_return( c );
1052         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1053         return 0;
1054 }