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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <stdio.h>
  10 #include <limits.h>
  11
  12 #include <ac/socket.h>
  13 #include <ac/errno.h>
  14 #include <ac/signal.h>
  15 #include <ac/string.h>
  16 #include <ac/time.h>
  17
  18 #include "slap.h"
  19
  20 /* protected by connections_mutex */
  21 static ldap_pvt_thread_mutex_t connections_mutex;
  22 static Connection *connections = NULL;
  23 static unsigned long conn_nextid = 0;
  24
  25 /* structure state (protected by connections_mutex) */
  26 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  27 #define SLAP_C_UNUSED                   0x01
  28 #define SLAP_C_USED                             0x02
  29
  30 /* connection state (protected by c_mutex ) */
  31 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  32 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  33 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  34 #define SLAP_C_BINDING                  0x03    /* binding */
  35 #define SLAP_C_CLOSING                  0x04    /* closing */
  36
  37 const char *
  38 connection_state2str( int state )
  39 {
  40         switch( state ) {
  41         case SLAP_C_INVALID:    return "!";
  42         case SLAP_C_INACTIVE:   return "|";
  43         case SLAP_C_ACTIVE:             return "";
  44         case SLAP_C_BINDING:    return "B";
  45         case SLAP_C_CLOSING:    return "C";
  46         }
  47
  48         return "?";
  49 }
  50
  51 static Connection* connection_get( ber_socket_t s );
  52
  53 static int connection_input( Connection *c );
  54 static void connection_close( Connection *c );
  55
  56 static int connection_op_activate( Connection *conn, Operation *op );
  57 static int connection_resched( Connection *conn );
  58 static void connection_abandon( Connection *conn );
  59 static void connection_destroy( Connection *c );
  60
  61 struct co_arg {
  62         Connection      *co_conn;
  63         Operation       *co_op;
  64 };
  65
  66 /*
  67  * Initialize connection management infrastructure.
  68  */
  69 int connections_init(void)
  70 {
  71         assert( connections == NULL );
  72
  73         if( connections != NULL) {
  74                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  75                         0, 0, 0 );
  76                 return -1;
  77         }
  78
  79         /* should check return of every call */
  80         ldap_pvt_thread_mutex_init( &connections_mutex );
  81
  82         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  83
  84         if( connections == NULL ) {
  85                 Debug( LDAP_DEBUG_ANY,
  86                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  87                         dtblsize, (long) sizeof(Connection), 0 );
  88                 return -1;
  89         }
  90
  91     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  92     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  93
  94         /*
  95          * per entry initialization of the Connection array initialization
  96          * will be done by connection_init()
  97          */
  98
  99         return 0;
 100 }
 101
 102 /*
 103  * Destroy connection management infrastructure.
 104  */
 105 int connections_destroy(void)
 106 {
 107         ber_socket_t i;
 108
 109         /* should check return of every call */
 110
 111         if( connections == NULL) {
 112                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 113                         0, 0, 0 );
 114                 return -1;
 115         }
 116
 117         for ( i = 0; i < dtblsize; i++ ) {
 118                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 119                         ber_sockbuf_free( connections[i].c_sb );
 120                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 121                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 122                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 123                 }
 124         }
 125
 126         free( connections );
 127         connections = NULL;
 128
 129         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 130         return 0;
 131 }
 132
 133 /*
 134  * shutdown all connections
 135  */
 136 int connections_shutdown(void)
 137 {
 138         ber_socket_t i;
 139
 140         ldap_pvt_thread_mutex_lock( &connections_mutex );
 141
 142         for ( i = 0; i < dtblsize; i++ ) {
 143                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 144                         continue;
 145                 }
 146
 147                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 148
 149                 /* connections_mutex and c_mutex are locked */
 150                 connection_closing( &connections[i] );
 151                 connection_close( &connections[i] );
 152
 153                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 154         }
 155
 156         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 157
 158         return 0;
 159 }
 160
 161 /*
 162  * Timeout idle connections.
 163  */
 164 int connections_timeout_idle(time_t now)
 165 {
 166         int i = 0;
 167         int connindex;
 168         Connection* c;
 169
 170         ldap_pvt_thread_mutex_lock( &connections_mutex );
 171
 172         for( c = connection_first( &connindex );
 173                 c != NULL;
 174                 c = connection_next( c, &connindex ) )
 175         {
 176                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 177                         /* close it */
 178                         connection_closing( c );
 179                         connection_close( c );
 180                         i++;
 181                 }
 182         }
 183         connection_done( c );
 184
 185         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 186
 187         return i;
 188 }
 189
 190 static Connection* connection_get( ber_socket_t s )
 191 {
 192         /* connections_mutex should be locked by caller */
 193
 194         Connection *c;
 195
 196         Debug( LDAP_DEBUG_ARGS,
 197                 "connection_get(%ld)\n",
 198                 (long) s, 0, 0 );
 199
 200         assert( connections != NULL );
 201
 202         if(s == AC_SOCKET_INVALID) {
 203                 return NULL;
 204         }
 205
 206 #ifndef HAVE_WINSOCK
 207         c = &connections[s];
 208
 209         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 210
 211 #else
 212         c = NULL;
 213         {
 214                 ber_socket_t i, sd;
 215
 216                 for(i=0; i<dtblsize; i++) {
 217                         ber_sockbuf_ctrl( connections[i].c_sb,
 218                                 LBER_SB_OPT_GET_FD, &sd );
 219
 220                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 221                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 222                                 assert( connections[i].c_sb == 0 );
 223                                 break;
 224                         }
 225
 226                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 227                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 228                                 assert( sd == AC_SOCKET_INVALID );
 229                                 continue;
 230                         }
 231
 232                         /* state can actually change from used -> unused by resched,
 233                          * so don't assert details here.
 234                          */
 235
 236                         if( sd == s ) {
 237                                 c = &connections[i];
 238                                 break;
 239                         }
 240                 }
 241         }
 242 #endif
 243
 244         if( c != NULL ) {
 245                 ber_socket_t    sd;
 246
 247                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 248
 249                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 250                 if( c->c_struct_state != SLAP_C_USED ) {
 251                         /* connection must have been closed due to resched */
 252
 253                         assert( c->c_conn_state == SLAP_C_INVALID );
 254                         assert( sd == AC_SOCKET_INVALID );
 255
 256                         Debug( LDAP_DEBUG_TRACE,
 257                                 "connection_get(%d): connection not used\n",
 258                                 s, 0, 0 );
 259
 260                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 261                         return NULL;
 262                 }
 263
 264                 Debug( LDAP_DEBUG_TRACE,
 265                         "connection_get(%d): got connid=%ld\n",
 266                         s, c->c_connid, 0 );
 267
 268                 c->c_n_get++;
 269
 270                 assert( c->c_struct_state == SLAP_C_USED );
 271                 assert( c->c_conn_state != SLAP_C_INVALID );
 272                 assert( sd != AC_SOCKET_INVALID );
 273
 274         c->c_activitytime = slap_get_time();
 275         }
 276
 277         return c;
 278 }
 279
 280 static void connection_return( Connection *c )
 281 {
 282         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 283 }
 284
 285 long connection_init(
 286         ber_socket_t s,
 287         const char* url,
 288         const char* dnsname,
 289         const char* peername,
 290         const char* sockname,
 291         int use_tls )
 292 {
 293         unsigned long id;
 294         Connection *c;
 295
 296         assert( connections != NULL );
 297
 298         assert( dnsname != NULL );
 299         assert( peername != NULL );
 300         assert( sockname != NULL );
 301
 302 #ifndef HAVE_TLS
 303         assert( !use_tls );
 304 #endif
 305
 306         if( s == AC_SOCKET_INVALID ) {
 307         Debug( LDAP_DEBUG_ANY,
 308                         "connection_init(%ld): invalid.\n",
 309                         (long) s, 0, 0 );
 310                 return -1;
 311         }
 312
 313         assert( s >= 0 );
 314 #ifndef HAVE_WINSOCK
 315         assert( s < dtblsize );
 316 #endif
 317
 318         ldap_pvt_thread_mutex_lock( &connections_mutex );
 319
 320 #ifndef HAVE_WINSOCK
 321         c = &connections[s];
 322
 323 #else
 324         {
 325                 unsigned int i;
 326
 327                 c = NULL;
 328
 329         for( i=0; i < dtblsize; i++) {
 330                 ber_socket_t    sd;
 331
 332             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 333                 assert( connections[i].c_sb == 0 );
 334                 c = &connections[i];
 335                 break;
 336             }
 337
 338                         sd = AC_SOCKET_INVALID;
 339                         if (connections[i].c_sb != NULL)
 340                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 341
 342             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 343                 assert( sd == AC_SOCKET_INVALID );
 344                 c = &connections[i];
 345                 break;
 346             }
 347
 348             assert( connections[i].c_struct_state == SLAP_C_USED );
 349             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 350             assert( sd != AC_SOCKET_INVALID );
 351         }
 352
 353         if( c == NULL ) {
 354                 Debug( LDAP_DEBUG_ANY,
 355                                 "connection_init(%d): connection table full (%d/%d)\n",
 356                                 s, i, dtblsize);
 357             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 358             return -1;
 359         }
 360     }
 361 #endif
 362
 363     assert( c != NULL );
 364
 365     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 366                 c->c_authmech = NULL;
 367         c->c_dn = NULL;
 368         c->c_cdn = NULL;
 369
 370                 c->c_listener_url = NULL;
 371                 c->c_peer_domain = NULL;
 372         c->c_peer_name = NULL;
 373         c->c_sock_name = NULL;
 374
 375         c->c_ops = NULL;
 376         c->c_pending_ops = NULL;
 377
 378                 c->c_sasl_bind_mech = NULL;
 379 #ifdef HAVE_CYRUS_SASL
 380                 c->c_sasl_bind_context = NULL;
 381 #endif
 382
 383         c->c_sb = ber_sockbuf_alloc( );
 384                 c->c_currentber = NULL;
 385
 386         /* should check status of thread calls */
 387         ldap_pvt_thread_mutex_init( &c->c_mutex );
 388         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 389         ldap_pvt_thread_cond_init( &c->c_write_cv );
 390
 391         c->c_struct_state = SLAP_C_UNUSED;
 392     }
 393
 394     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 395
 396     assert( c->c_struct_state == SLAP_C_UNUSED );
 397         assert( c->c_authmech == NULL );
 398     assert(     c->c_dn == NULL );
 399     assert(     c->c_cdn == NULL );
 400     assert( c->c_listener_url == NULL );
 401     assert( c->c_peer_domain == NULL );
 402     assert( c->c_peer_name == NULL );
 403     assert( c->c_sock_name == NULL );
 404     assert( c->c_ops == NULL );
 405     assert( c->c_pending_ops == NULL );
 406         assert( c->c_sasl_bind_mech == NULL );
 407 #ifdef HAVE_CYRUS_SASL
 408         assert( c->c_sasl_bind_context == NULL );
 409 #endif
 410         assert( c->c_currentber == NULL );
 411
 412         c->c_listener_url = ch_strdup( url  );
 413         c->c_peer_domain = ch_strdup( dnsname  );
 414     c->c_peer_name = ch_strdup( peername  );
 415     c->c_sock_name = ch_strdup( sockname );
 416
 417     c->c_n_ops_received = 0;
 418     c->c_n_ops_executing = 0;
 419     c->c_n_ops_pending = 0;
 420     c->c_n_ops_completed = 0;
 421
 422         c->c_n_get = 0;
 423         c->c_n_read = 0;
 424         c->c_n_write = 0;
 425
 426         /* assume LDAPv3 until bind */
 427         c->c_protocol = LDAP_VERSION3;
 428
 429     c->c_activitytime = c->c_starttime = slap_get_time();
 430
 431     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp, LBER_SBIOD_LEVEL_PROVIDER,
 432         (void *)&s );
 433     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 434         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 435 #ifdef LDAP_DEBUG
 436     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, INT_MAX, NULL );
 437 #endif
 438     if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK, (void *)1 ) < 0 ) {
 439         Debug( LDAP_DEBUG_ANY,
 440             "connection_init(%d, %s): set nonblocking failed\n",
 441             s, c->c_peer_name,0 );
 442     }
 443
 444     id = c->c_connid = conn_nextid++;
 445
 446     c->c_conn_state = SLAP_C_INACTIVE;
 447     c->c_struct_state = SLAP_C_USED;
 448
 449 #ifdef HAVE_TLS
 450     if ( use_tls ) {
 451             c->c_is_tls = 1;
 452             c->c_needs_tls_accept = 1;
 453     } else {
 454             c->c_is_tls = 0;
 455             c->c_needs_tls_accept = 0;
 456     }
 457 #endif
 458
 459     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 460     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 461
 462     backend_connection_init(c);
 463
 464     return id;
 465 }
 466
 467 static void
 468 connection_destroy( Connection *c )
 469 {
 470         /* note: connections_mutex should be locked by caller */
 471     ber_socket_t        sd;
 472
 473     assert( connections != NULL );
 474     assert( c != NULL );
 475     assert( c->c_struct_state != SLAP_C_UNUSED );
 476     assert( c->c_conn_state != SLAP_C_INVALID );
 477     assert( c->c_ops == NULL );
 478
 479     backend_connection_destroy(c);
 480
 481     c->c_protocol = 0;
 482     c->c_connid = -1;
 483
 484     c->c_activitytime = c->c_starttime = 0;
 485
 486         if(c->c_authmech != NULL ) {
 487                 free(c->c_authmech);
 488                 c->c_authmech = NULL;
 489         }
 490     if(c->c_dn != NULL) {
 491         free(c->c_dn);
 492         c->c_dn = NULL;
 493     }
 494         if(c->c_cdn != NULL) {
 495                 free(c->c_cdn);
 496                 c->c_cdn = NULL;
 497         }
 498         if(c->c_listener_url != NULL) {
 499                 free(c->c_listener_url);
 500                 c->c_listener_url = NULL;
 501         }
 502         if(c->c_peer_domain != NULL) {
 503                 free(c->c_peer_domain);
 504                 c->c_peer_domain = NULL;
 505         }
 506         if(c->c_peer_name != NULL) {
 507 #ifdef LDAP_PF_LOCAL
 508                 /*
 509                  * If peer was a domain socket, unlink. Mind you,
 510                  * they may be un-named. Should we leave this to
 511                  * the client?
 512                  */
 513                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 514                         char *path = c->c_peer_name + 5;
 515                         if (path != '\0') {
 516                                 (void)unlink(path);
 517                         }
 518                 }
 519 #endif /* LDAP_PF_LOCAL */
 520                 free(c->c_peer_name);
 521                 c->c_peer_name = NULL;
 522         }
 523         if(c->c_sock_name != NULL) {
 524                 free(c->c_sock_name);
 525                 c->c_sock_name = NULL;
 526         }
 527
 528         c->c_sasl_bind_in_progress = 0;
 529         if(c->c_sasl_bind_mech != NULL) {
 530                 free(c->c_sasl_bind_mech);
 531                 c->c_sasl_bind_mech = NULL;
 532         }
 533 #ifdef HAVE_CYRUS_SASL
 534         if(c->c_sasl_bind_context != NULL ) {
 535                 sasl_dispose( &c->c_sasl_bind_context );
 536                 c->c_sasl_bind_context = NULL;
 537         }
 538 #endif
 539
 540         if ( c->c_currentber != NULL ) {
 541                 ber_free( c->c_currentber, 1 );
 542                 c->c_currentber = NULL;
 543         }
 544
 545         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 546         if ( sd != AC_SOCKET_INVALID ) {
 547                 slapd_remove( sd, 0 );
 548
 549                 Statslog( LDAP_DEBUG_STATS,
 550                     "conn=%ld fd=%d closed\n",
 551                         c->c_connid, sd, 0, 0, 0 );
 552         }
 553
 554         ber_sockbuf_free( c->c_sb );
 555         c->c_sb = ber_sockbuf_alloc( );
 556
 557     c->c_conn_state = SLAP_C_INVALID;
 558     c->c_struct_state = SLAP_C_UNUSED;
 559 }
 560
 561 int connection_state_closing( Connection *c )
 562 {
 563         /* c_mutex must be locked by caller */
 564
 565         int state;
 566         assert( c != NULL );
 567         assert( c->c_struct_state == SLAP_C_USED );
 568
 569         state = c->c_conn_state;
 570
 571         assert( state != SLAP_C_INVALID );
 572
 573         return state == SLAP_C_CLOSING;
 574 }
 575
 576 static void connection_abandon( Connection *c )
 577 {
 578         /* c_mutex must be locked by caller */
 579
 580         Operation *o;
 581
 582         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 583                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 584                 o->o_abandon = 1;
 585                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 586         }
 587
 588         /* remove pending operations */
 589         for( o = slap_op_pop( &c->c_pending_ops );
 590                 o != NULL;
 591                 o = slap_op_pop( &c->c_pending_ops ) )
 592         {
 593                 slap_op_free( o );
 594         }
 595 }
 596
 597 void connection_closing( Connection *c )
 598 {
 599         assert( connections != NULL );
 600         assert( c != NULL );
 601         assert( c->c_struct_state == SLAP_C_USED );
 602         assert( c->c_conn_state != SLAP_C_INVALID );
 603
 604         /* c_mutex must be locked by caller */
 605
 606         if( c->c_conn_state != SLAP_C_CLOSING ) {
 607                 ber_socket_t    sd;
 608
 609                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 610                 Debug( LDAP_DEBUG_TRACE,
 611                         "connection_closing: readying conn=%ld sd=%d for close\n",
 612                         c->c_connid, sd, 0 );
 613
 614                 /* update state to closing */
 615                 c->c_conn_state = SLAP_C_CLOSING;
 616
 617                 /* don't listen on this port anymore */
 618                 slapd_clr_read( sd, 1 );
 619
 620                 /* abandon active operations */
 621                 connection_abandon( c );
 622
 623                 /* wake write blocked operations */
 624                 slapd_clr_write( sd, 1 );
 625                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 626         }
 627 }
 628
 629 static void connection_close( Connection *c )
 630 {
 631         ber_socket_t    sd;
 632
 633         assert( connections != NULL );
 634         assert( c != NULL );
 635         assert( c->c_struct_state == SLAP_C_USED );
 636         assert( c->c_conn_state == SLAP_C_CLOSING );
 637
 638         /* note: connections_mutex and c_mutex should be locked by caller */
 639
 640         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 641         if( c->c_ops != NULL ) {
 642                 Debug( LDAP_DEBUG_TRACE,
 643                         "connection_close: deferring conn=%ld sd=%d\n",
 644                         c->c_connid, sd, 0 );
 645
 646                 return;
 647         }
 648
 649         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 650                 c->c_connid, sd, 0 );
 651
 652         connection_destroy( c );
 653 }
 654
 655 unsigned long connections_nextid(void)
 656 {
 657         unsigned long id;
 658         assert( connections != NULL );
 659
 660         ldap_pvt_thread_mutex_lock( &connections_mutex );
 661
 662         id = conn_nextid;
 663
 664         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 665
 666         return id;
 667 }
 668
 669 Connection* connection_first( ber_socket_t *index )
 670 {
 671         assert( connections != NULL );
 672         assert( index != NULL );
 673
 674         ldap_pvt_thread_mutex_lock( &connections_mutex );
 675
 676         *index = 0;
 677
 678         return connection_next(NULL, index);
 679 }
 680
 681 Connection* connection_next( Connection *c, ber_socket_t *index )
 682 {
 683         assert( connections != NULL );
 684         assert( index != NULL );
 685         assert( *index <= dtblsize );
 686
 687         if( c != NULL ) {
 688                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 689         }
 690
 691         c = NULL;
 692
 693         for(; *index < dtblsize; (*index)++) {
 694                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 695                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 696 #ifndef HAVE_WINSOCK
 697                         continue;
 698 #else
 699                         break;
 700 #endif
 701                 }
 702
 703                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 704                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 705                         c = &connections[(*index)++];
 706                         break;
 707                 }
 708
 709                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 710                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 711         }
 712
 713         if( c != NULL ) {
 714                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 715         }
 716
 717         return c;
 718 }
 719
 720 void connection_done( Connection *c )
 721 {
 722         assert( connections != NULL );
 723
 724         if( c != NULL ) {
 725                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 726         }
 727
 728         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 729 }
 730
 731 /*
 732  * connection_activity - handle the request operation op on connection
 733  * conn.  This routine figures out what kind of operation it is and
 734  * calls the appropriate stub to handle it.
 735  */
 736
 737 static void *
 738 connection_operation( void *arg_v )
 739 {
 740         int rc;
 741         struct co_arg   *arg = arg_v;
 742         ber_tag_t tag = arg->co_op->o_tag;
 743         Connection *conn = arg->co_conn;
 744
 745         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 746         num_ops_initiated++;
 747         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 748
 749         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 750                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 751                         "error: SASL bind in progress (tag=%ld).\n",
 752                         (long) tag, 0, 0 );
 753                 send_ldap_result( conn, arg->co_op,
 754                         rc = LDAP_OPERATIONS_ERROR,
 755                         NULL, "SASL bind in progress", NULL, NULL );
 756                 goto operations_error;
 757         }
 758
 759         switch ( tag ) {
 760         case LDAP_REQ_BIND:
 761                 rc = do_bind( conn, arg->co_op );
 762                 break;
 763
 764         case LDAP_REQ_UNBIND:
 765                 rc = do_unbind( conn, arg->co_op );
 766                 break;
 767
 768         case LDAP_REQ_ADD:
 769                 rc = do_add( conn, arg->co_op );
 770                 break;
 771
 772         case LDAP_REQ_DELETE:
 773                 rc = do_delete( conn, arg->co_op );
 774                 break;
 775
 776         case LDAP_REQ_MODRDN:
 777                 rc = do_modrdn( conn, arg->co_op );
 778                 break;
 779
 780         case LDAP_REQ_MODIFY:
 781                 rc = do_modify( conn, arg->co_op );
 782                 break;
 783
 784         case LDAP_REQ_COMPARE:
 785                 rc = do_compare( conn, arg->co_op );
 786                 break;
 787
 788         case LDAP_REQ_SEARCH:
 789                 rc = do_search( conn, arg->co_op );
 790                 break;
 791
 792         case LDAP_REQ_ABANDON:
 793                 rc = do_abandon( conn, arg->co_op );
 794                 break;
 795
 796         case LDAP_REQ_EXTENDED:
 797                 rc = do_extended( conn, arg->co_op );
 798                 break;
 799
 800         default:
 801                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 802                     tag, 0, 0 );
 803                 arg->co_op->o_tag = LBER_ERROR;
 804                 send_ldap_disconnect( conn, arg->co_op,
 805                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 806                 rc = -1;
 807                 break;
 808         }
 809
 810         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 811
 812 operations_error:
 813         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 814         num_ops_completed++;
 815         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 816
 817         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 818
 819         conn->c_n_ops_executing--;
 820         conn->c_n_ops_completed++;
 821
 822         slap_op_remove( &conn->c_ops, arg->co_op );
 823         slap_op_free( arg->co_op );
 824         arg->co_op = NULL;
 825         arg->co_conn = NULL;
 826         free( (char *) arg );
 827         arg = NULL;
 828
 829         switch( tag ) {
 830         case LBER_ERROR:
 831         case LDAP_REQ_UNBIND:
 832                 /* c_mutex is locked */
 833                 connection_closing( conn );
 834                 break;
 835
 836         case LDAP_REQ_BIND:
 837                 conn->c_sasl_bind_in_progress =
 838                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 839
 840                 if( conn->c_conn_state == SLAP_C_BINDING) {
 841                         conn->c_conn_state = SLAP_C_ACTIVE;
 842                 }
 843         }
 844
 845         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 846         active_threads--;
 847         if( active_threads < 1 ) {
 848                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 849         }
 850         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 851
 852         connection_resched( conn );
 853
 854         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 855
 856         return NULL;
 857 }
 858
 859 int connection_read(ber_socket_t s)
 860 {
 861         int rc = 0;
 862         Connection *c;
 863         assert( connections != NULL );
 864
 865         ldap_pvt_thread_mutex_lock( &connections_mutex );
 866
 867         /* get (locked) connection */
 868         c = connection_get( s );
 869
 870         if( c == NULL ) {
 871                 Debug( LDAP_DEBUG_ANY,
 872                         "connection_read(%ld): no connection!\n",
 873                         (long) s, 0, 0 );
 874
 875                 slapd_remove(s, 0);
 876
 877                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 878                 return -1;
 879         }
 880
 881         c->c_n_read++;
 882
 883         if( c->c_conn_state == SLAP_C_CLOSING ) {
 884                 Debug( LDAP_DEBUG_TRACE,
 885                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 886                         s, c->c_connid, 0 );
 887
 888                 connection_return( c );
 889                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 890                 return 0;
 891         }
 892
 893         Debug( LDAP_DEBUG_TRACE,
 894                 "connection_read(%d): checking for input on id=%ld\n",
 895                 s, c->c_connid, 0 );
 896
 897 #ifdef HAVE_TLS
 898         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 899                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 900                 if ( rc < 0 ) {
 901                         struct timeval tv;
 902                         fd_set rfd;
 903
 904                         Debug( LDAP_DEBUG_TRACE,
 905                                "connection_read(%d): TLS accept error error=%d id=%ld, closing\n",
 906                                s, rc, c->c_connid );
 907
 908                         c->c_needs_tls_accept = 0;
 909                         /* connections_mutex and c_mutex are locked */
 910                         connection_closing( c );
 911
 912                         /* Drain input before close, to allow SSL error codes
 913                          * to propagate to client. */
 914                         FD_ZERO(&rfd);
 915                         FD_SET(s, &rfd);
 916                         for (rc=1; rc>0;)
 917                         {
 918                             tv.tv_sec = 1;
 919                             tv.tv_usec = 0;
 920                             rc = select(s+1, &rfd, NULL, NULL, &tv);
 921                             if (rc == 1)
 922                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
 923                                     NULL);
 924                         }
 925                         connection_close( c );
 926                 } else if ( rc == 0 ) {
 927                         c->c_needs_tls_accept = 0;
 928                 }
 929                 connection_return( c );
 930                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 931                 return 0;
 932         }
 933 #endif
 934
 935 #define CONNECTION_INPUT_LOOP 1
 936
 937 #ifdef DATA_READY_LOOP
 938         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
 939 #elif CONNECTION_INPUT_LOOP
 940         while(!rc)
 941 #endif
 942         {
 943                 /* How do we do this without getting into a busy loop ? */
 944                 rc = connection_input( c );
 945         }
 946
 947         if( rc < 0 ) {
 948                 Debug( LDAP_DEBUG_TRACE,
 949                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 950                         s, rc, c->c_connid );
 951
 952                 /* connections_mutex and c_mutex are locked */
 953                 connection_closing( c );
 954                 connection_close( c );
 955         }
 956
 957         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
 958                 slapd_set_read( s, 1 );
 959         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
 960                 slapd_set_write( s, 1 );
 961         connection_return( c );
 962         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 963         return 0;
 964 }
 965
 966 static int
 967 connection_input(
 968     Connection *conn
 969 )
 970 {
 971         Operation *op;
 972         ber_tag_t       tag;
 973         ber_len_t       len;
 974         ber_int_t       msgid;
 975         BerElement      *ber;
 976
 977         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 978             == NULL ) {
 979                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 980                 return -1;
 981         }
 982
 983         errno = 0;
 984         if ( (tag = ber_get_next( conn->c_sb, &len, conn->c_currentber ))
 985             != LDAP_TAG_MESSAGE )
 986         {
 987                 int err = errno;
 988                 ber_socket_t    sd;
 989
 990                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
 991
 992                 Debug( LDAP_DEBUG_TRACE,
 993                         "ber_get_next on fd %d failed errno=%d (%s)\n",
 994                         sd, err, sock_errstr(err) );
 995
 996                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 997                         /* log, close and send error */
 998                         ber_free( conn->c_currentber, 1 );
 999                         conn->c_currentber = NULL;
1000
1001                         return -2;
1002                 }
1003                 return 1;
1004         }
1005
1006         ber = conn->c_currentber;
1007         conn->c_currentber = NULL;
1008
1009         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1010                 /* log, close and send error */
1011                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1012                     0 );
1013                 ber_free( ber, 1 );
1014                 return -1;
1015         }
1016
1017         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1018                 /* log, close and send error */
1019                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1020                     0 );
1021                 ber_free( ber, 1 );
1022
1023                 return -1;
1024         }
1025
1026         if(tag == LDAP_REQ_BIND) {
1027                 /* immediately abandon all exiting operations upon BIND */
1028                 connection_abandon( conn );
1029         }
1030
1031         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1032
1033         if ( conn->c_conn_state == SLAP_C_BINDING
1034                 || conn->c_conn_state == SLAP_C_CLOSING )
1035         {
1036                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1037                 conn->c_n_ops_pending++;
1038                 slap_op_add( &conn->c_pending_ops, op );
1039
1040         } else {
1041                 conn->c_n_ops_executing++;
1042                 connection_op_activate( conn, op );
1043         }
1044
1045 #ifdef NO_THREADS
1046         if ( conn->c_struct_state != SLAP_C_USED ) {
1047                 /* connection must have got closed underneath us */
1048                 return 1;
1049         }
1050 #endif
1051         assert( conn->c_struct_state == SLAP_C_USED );
1052
1053         return 0;
1054 }
1055
1056 static int
1057 connection_resched( Connection *conn )
1058 {
1059         Operation *op;
1060
1061         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1062                 ber_socket_t    sd;
1063
1064                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1065                 Debug( LDAP_DEBUG_TRACE,
1066                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1067                         conn->c_connid, sd, 0 );
1068
1069                 ldap_pvt_thread_mutex_lock( &connections_mutex );
1070                 connection_close( conn );
1071                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1072                 return 0;
1073         }
1074
1075         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1076                 /* other states need different handling */
1077                 return 0;
1078         }
1079
1080         for( op = slap_op_pop( &conn->c_pending_ops );
1081                 op != NULL;
1082                 op = slap_op_pop( &conn->c_pending_ops ) )
1083         {
1084                 /* pending operations should not be marked for abandonment */
1085                 assert(!op->o_abandon);
1086
1087                 conn->c_n_ops_pending--;
1088                 conn->c_n_ops_executing++;
1089
1090                 connection_op_activate( conn, op );
1091
1092                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1093                         break;
1094                 }
1095         }
1096         return 0;
1097 }
1098
1099 static int connection_op_activate( Connection *conn, Operation *op )
1100 {
1101         struct co_arg *arg;
1102         char *tmpdn;
1103         int status;
1104         ber_tag_t tag = op->o_tag;
1105
1106         if(tag == LDAP_REQ_BIND) {
1107                 conn->c_conn_state = SLAP_C_BINDING;
1108         }
1109
1110         if ( conn->c_dn != NULL ) {
1111                 tmpdn = ch_strdup( conn->c_dn );
1112         } else {
1113                 tmpdn = NULL;
1114         }
1115
1116         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1117         arg->co_conn = conn;
1118         arg->co_op = op;
1119
1120         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
1121         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1122         (void) dn_normalize( arg->co_op->o_ndn );
1123
1124         arg->co_op->o_protocol = conn->c_protocol;
1125         arg->co_op->o_connid = conn->c_connid;
1126
1127         arg->co_op->o_authtype = conn->c_authtype;
1128         arg->co_op->o_authmech = conn->c_authmech != NULL
1129                 ?  ch_strdup( conn->c_authmech ) : NULL;
1130
1131         slap_op_add( &conn->c_ops, arg->co_op );
1132
1133         if( tmpdn != NULL ) {
1134                 free( tmpdn );
1135         }
1136
1137         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
1138         active_threads++;
1139         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
1140
1141         status = ldap_pvt_thread_pool_submit( connection_pool, connection_operation, (void *) arg );
1142
1143         if ( status != 0 ) {
1144                 Debug( LDAP_DEBUG_ANY,
1145                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
1146
1147                 /* should move op to pending list */
1148         }
1149
1150         return status;
1151 }
1152
1153 int connection_write(ber_socket_t s)
1154 {
1155         Connection *c;
1156         assert( connections != NULL );
1157
1158         ldap_pvt_thread_mutex_lock( &connections_mutex );
1159
1160         c = connection_get( s );
1161
1162         slapd_clr_write( s, 0);
1163
1164         if( c == NULL ) {
1165                 Debug( LDAP_DEBUG_ANY,
1166                         "connection_write(%ld): no connection!\n",
1167                         (long) s, 0, 0 );
1168                 slapd_remove(s, 0);
1169                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1170                 return -1;
1171         }
1172
1173         c->c_n_write++;
1174
1175         Debug( LDAP_DEBUG_TRACE,
1176                 "connection_write(%d): waking output for id=%ld\n",
1177                 s, c->c_connid, 0 );
1178
1179         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1180
1181         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1182                 slapd_set_read( s, 1 );
1183         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1184                 slapd_set_write( s, 1 );
1185         connection_return( c );
1186         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1187         return 0;
1188 }