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 "ldap_pvt.h"
  19
  20 #include "slap.h"
  21
  22 /* protected by connections_mutex */
  23 static ldap_pvt_thread_mutex_t connections_mutex;
  24 static Connection *connections = NULL;
  25 static unsigned long conn_nextid = 0;
  26
  27 /* structure state (protected by connections_mutex) */
  28 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  29 #define SLAP_C_UNUSED                   0x01
  30 #define SLAP_C_USED                             0x02
  31
  32 /* connection state (protected by c_mutex ) */
  33 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  34 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  35 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  36 #define SLAP_C_BINDING                  0x03    /* binding */
  37 #define SLAP_C_CLOSING                  0x04    /* closing */
  38
  39 const char *
  40 connection_state2str( int state )
  41 {
  42         switch( state ) {
  43         case SLAP_C_INVALID:    return "!";
  44         case SLAP_C_INACTIVE:   return "|";
  45         case SLAP_C_ACTIVE:             return "";
  46         case SLAP_C_BINDING:    return "B";
  47         case SLAP_C_CLOSING:    return "C";
  48         }
  49
  50         return "?";
  51 }
  52
  53 static Connection* connection_get( ber_socket_t s );
  54
  55 static int connection_input( Connection *c );
  56 static void connection_close( Connection *c );
  57
  58 static int connection_op_activate( Connection *conn, Operation *op );
  59 static int connection_resched( Connection *conn );
  60 static void connection_abandon( Connection *conn );
  61 static void connection_destroy( Connection *c );
  62
  63 struct co_arg {
  64         Connection      *co_conn;
  65         Operation       *co_op;
  66 };
  67
  68 /*
  69  * Initialize connection management infrastructure.
  70  */
  71 int connections_init(void)
  72 {
  73         assert( connections == NULL );
  74
  75         if( connections != NULL) {
  76                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  77                         0, 0, 0 );
  78                 return -1;
  79         }
  80
  81         /* should check return of every call */
  82         ldap_pvt_thread_mutex_init( &connections_mutex );
  83
  84         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  85
  86         if( connections == NULL ) {
  87                 Debug( LDAP_DEBUG_ANY,
  88                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  89                         dtblsize, (long) sizeof(Connection), 0 );
  90                 return -1;
  91         }
  92
  93     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
  94     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
  95
  96         /*
  97          * per entry initialization of the Connection array initialization
  98          * will be done by connection_init()
  99          */
 100
 101         return 0;
 102 }
 103
 104 /*
 105  * Destroy connection management infrastructure.
 106  */
 107 int connections_destroy(void)
 108 {
 109         ber_socket_t i;
 110
 111         /* should check return of every call */
 112
 113         if( connections == NULL) {
 114                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 115                         0, 0, 0 );
 116                 return -1;
 117         }
 118
 119         for ( i = 0; i < dtblsize; i++ ) {
 120                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 121                         ber_sockbuf_free( connections[i].c_sb );
 122                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 123                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 124                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 125                 }
 126         }
 127
 128         free( connections );
 129         connections = NULL;
 130
 131         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 132         return 0;
 133 }
 134
 135 /*
 136  * shutdown all connections
 137  */
 138 int connections_shutdown(void)
 139 {
 140         ber_socket_t i;
 141
 142         ldap_pvt_thread_mutex_lock( &connections_mutex );
 143
 144         for ( i = 0; i < dtblsize; i++ ) {
 145                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 146                         continue;
 147                 }
 148
 149                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 150
 151                 /* connections_mutex and c_mutex are locked */
 152                 connection_closing( &connections[i] );
 153                 connection_close( &connections[i] );
 154
 155                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 156         }
 157
 158         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 159
 160         return 0;
 161 }
 162
 163 /*
 164  * Timeout idle connections.
 165  */
 166 int connections_timeout_idle(time_t now)
 167 {
 168         int i = 0;
 169         int connindex;
 170         Connection* c;
 171
 172         ldap_pvt_thread_mutex_lock( &connections_mutex );
 173
 174         for( c = connection_first( &connindex );
 175                 c != NULL;
 176                 c = connection_next( c, &connindex ) )
 177         {
 178                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 179                         /* close it */
 180                         connection_closing( c );
 181                         connection_close( c );
 182                         i++;
 183                 }
 184         }
 185         connection_done( c );
 186
 187         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 188
 189         return i;
 190 }
 191
 192 static Connection* connection_get( ber_socket_t s )
 193 {
 194         /* connections_mutex should be locked by caller */
 195
 196         Connection *c;
 197
 198         Debug( LDAP_DEBUG_ARGS,
 199                 "connection_get(%ld)\n",
 200                 (long) s, 0, 0 );
 201
 202         assert( connections != NULL );
 203
 204         if(s == AC_SOCKET_INVALID) {
 205                 return NULL;
 206         }
 207
 208 #ifndef HAVE_WINSOCK
 209         c = &connections[s];
 210
 211         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 212
 213 #else
 214         c = NULL;
 215         {
 216                 ber_socket_t i, sd;
 217
 218                 for(i=0; i<dtblsize; i++) {
 219                         ber_sockbuf_ctrl( connections[i].c_sb,
 220                                 LBER_SB_OPT_GET_FD, &sd );
 221
 222                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 223                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 224                                 assert( connections[i].c_sb == 0 );
 225                                 break;
 226                         }
 227
 228                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 229                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 230                                 assert( sd == AC_SOCKET_INVALID );
 231                                 continue;
 232                         }
 233
 234                         /* state can actually change from used -> unused by resched,
 235                          * so don't assert details here.
 236                          */
 237
 238                         if( sd == s ) {
 239                                 c = &connections[i];
 240                                 break;
 241                         }
 242                 }
 243         }
 244 #endif
 245
 246         if( c != NULL ) {
 247                 ber_socket_t    sd;
 248
 249                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 250
 251                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 252                 if( c->c_struct_state != SLAP_C_USED ) {
 253                         /* connection must have been closed due to resched */
 254
 255                         assert( c->c_conn_state == SLAP_C_INVALID );
 256                         assert( sd == AC_SOCKET_INVALID );
 257
 258                         Debug( LDAP_DEBUG_TRACE,
 259                                 "connection_get(%d): connection not used\n",
 260                                 s, 0, 0 );
 261
 262                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 263                         return NULL;
 264                 }
 265
 266                 Debug( LDAP_DEBUG_TRACE,
 267                         "connection_get(%d): got connid=%ld\n",
 268                         s, c->c_connid, 0 );
 269
 270                 c->c_n_get++;
 271
 272                 assert( c->c_struct_state == SLAP_C_USED );
 273                 assert( c->c_conn_state != SLAP_C_INVALID );
 274                 assert( sd != AC_SOCKET_INVALID );
 275
 276         c->c_activitytime = slap_get_time();
 277         }
 278
 279         return c;
 280 }
 281
 282 static void connection_return( Connection *c )
 283 {
 284         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 285 }
 286
 287 long connection_init(
 288         ber_socket_t s,
 289         const char* url,
 290         const char* dnsname,
 291         const char* peername,
 292         const char* sockname,
 293         int use_tls,
 294         unsigned ssf,
 295         char *authid )
 296 {
 297         unsigned long id;
 298         Connection *c;
 299
 300         assert( connections != NULL );
 301
 302         assert( dnsname != NULL );
 303         assert( peername != NULL );
 304         assert( sockname != NULL );
 305
 306 #ifndef HAVE_TLS
 307         assert( !use_tls );
 308 #endif
 309
 310         if( s == AC_SOCKET_INVALID ) {
 311         Debug( LDAP_DEBUG_ANY,
 312                         "connection_init(%ld): invalid.\n",
 313                         (long) s, 0, 0 );
 314                 return -1;
 315         }
 316
 317         assert( s >= 0 );
 318 #ifndef HAVE_WINSOCK
 319         assert( s < dtblsize );
 320 #endif
 321
 322         ldap_pvt_thread_mutex_lock( &connections_mutex );
 323
 324 #ifndef HAVE_WINSOCK
 325         c = &connections[s];
 326
 327 #else
 328         {
 329                 unsigned int i;
 330
 331                 c = NULL;
 332
 333         for( i=0; i < dtblsize; i++) {
 334                 ber_socket_t    sd;
 335
 336             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 337                 assert( connections[i].c_sb == 0 );
 338                 c = &connections[i];
 339                 break;
 340             }
 341
 342                         sd = AC_SOCKET_INVALID;
 343                         if (connections[i].c_sb != NULL)
 344                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 345
 346             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 347                 assert( sd == AC_SOCKET_INVALID );
 348                 c = &connections[i];
 349                 break;
 350             }
 351
 352             assert( connections[i].c_struct_state == SLAP_C_USED );
 353             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 354             assert( sd != AC_SOCKET_INVALID );
 355         }
 356
 357         if( c == NULL ) {
 358                 Debug( LDAP_DEBUG_ANY,
 359                                 "connection_init(%d): connection table full (%d/%d)\n",
 360                                 s, i, dtblsize);
 361             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 362             return -1;
 363         }
 364     }
 365 #endif
 366
 367     assert( c != NULL );
 368
 369     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 370                 c->c_authmech = NULL;
 371         c->c_dn = NULL;
 372         c->c_cdn = NULL;
 373
 374                 c->c_listener_url = NULL;
 375                 c->c_peer_domain = NULL;
 376         c->c_peer_name = NULL;
 377         c->c_sock_name = NULL;
 378
 379         c->c_ops = NULL;
 380         c->c_pending_ops = NULL;
 381
 382                 c->c_sasl_bind_mech = NULL;
 383                 c->c_sasl_context = NULL;
 384                 c->c_sasl_extra = NULL;
 385
 386         c->c_sb = ber_sockbuf_alloc( );
 387                 c->c_currentber = NULL;
 388
 389         /* should check status of thread calls */
 390         ldap_pvt_thread_mutex_init( &c->c_mutex );
 391         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 392         ldap_pvt_thread_cond_init( &c->c_write_cv );
 393
 394         c->c_struct_state = SLAP_C_UNUSED;
 395     }
 396
 397     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 398
 399     assert( c->c_struct_state == SLAP_C_UNUSED );
 400         assert( c->c_authmech == NULL );
 401     assert(     c->c_dn == NULL );
 402     assert(     c->c_cdn == NULL );
 403     assert( c->c_listener_url == NULL );
 404     assert( c->c_peer_domain == NULL );
 405     assert( c->c_peer_name == NULL );
 406     assert( c->c_sock_name == NULL );
 407     assert( c->c_ops == NULL );
 408     assert( c->c_pending_ops == NULL );
 409         assert( c->c_sasl_bind_mech == NULL );
 410         assert( c->c_sasl_context == NULL );
 411         assert( c->c_sasl_extra == NULL );
 412         assert( c->c_currentber == NULL );
 413
 414         c->c_listener_url = ch_strdup( url  );
 415         c->c_peer_domain = ch_strdup( dnsname  );
 416     c->c_peer_name = ch_strdup( peername  );
 417     c->c_sock_name = ch_strdup( sockname );
 418
 419     c->c_n_ops_received = 0;
 420     c->c_n_ops_executing = 0;
 421     c->c_n_ops_pending = 0;
 422     c->c_n_ops_completed = 0;
 423
 424         c->c_n_get = 0;
 425         c->c_n_read = 0;
 426         c->c_n_write = 0;
 427
 428         /* assume LDAPv3 until bind */
 429         c->c_protocol = LDAP_VERSION3;
 430
 431     c->c_activitytime = c->c_starttime = slap_get_time();
 432
 433     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp, LBER_SBIOD_LEVEL_PROVIDER,
 434         (void *)&s );
 435     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 436         LBER_SBIOD_LEVEL_PROVIDER, NULL );
 437 #ifdef LDAP_DEBUG
 438     ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug, INT_MAX, NULL );
 439 #endif
 440     if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK, c /* non-NULL */ ) < 0 ) {
 441         Debug( LDAP_DEBUG_ANY,
 442             "connection_init(%d, %s): set nonblocking failed\n",
 443             s, c->c_peer_name, 0 );
 444     }
 445
 446
 447     id = c->c_connid = conn_nextid++;
 448
 449     c->c_conn_state = SLAP_C_INACTIVE;
 450     c->c_struct_state = SLAP_C_USED;
 451
 452 #ifdef HAVE_TLS
 453     if ( use_tls ) {
 454             c->c_is_tls = 1;
 455             c->c_needs_tls_accept = 1;
 456     } else {
 457             c->c_is_tls = 0;
 458             c->c_needs_tls_accept = 0;
 459     }
 460 #endif
 461         slap_sasl_open( c );
 462         slap_sasl_external( c, ssf, authid );
 463
 464     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 465     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 466
 467     backend_connection_init(c);
 468
 469     return id;
 470 }
 471
 472 static void
 473 connection_destroy( Connection *c )
 474 {
 475         /* note: connections_mutex should be locked by caller */
 476     ber_socket_t        sd;
 477
 478     assert( connections != NULL );
 479     assert( c != NULL );
 480     assert( c->c_struct_state != SLAP_C_UNUSED );
 481     assert( c->c_conn_state != SLAP_C_INVALID );
 482     assert( c->c_ops == NULL );
 483
 484     backend_connection_destroy(c);
 485
 486     c->c_protocol = 0;
 487     c->c_connid = -1;
 488
 489     c->c_activitytime = c->c_starttime = 0;
 490
 491         if(c->c_authmech != NULL ) {
 492                 free(c->c_authmech);
 493                 c->c_authmech = NULL;
 494         }
 495     if(c->c_dn != NULL) {
 496         free(c->c_dn);
 497         c->c_dn = NULL;
 498     }
 499         if(c->c_cdn != NULL) {
 500                 free(c->c_cdn);
 501                 c->c_cdn = NULL;
 502         }
 503         if(c->c_listener_url != NULL) {
 504                 free(c->c_listener_url);
 505                 c->c_listener_url = NULL;
 506         }
 507         if(c->c_peer_domain != NULL) {
 508                 free(c->c_peer_domain);
 509                 c->c_peer_domain = NULL;
 510         }
 511         if(c->c_peer_name != NULL) {
 512 #ifdef LDAP_PF_lOCAL
 513                 /*
 514                  * If peer was a domain socket, unlink. Mind you,
 515                  * they may be un-named. Should we leave this to
 516                  * the client?
 517                  */
 518                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 519                         char *path = c->c_peer_name + 5;
 520                         if (path != '\0') {
 521                                 (void)unlink(path);
 522                         }
 523                 }
 524 #endif /* LDAP_PF_LOCAL */
 525
 526                 free(c->c_peer_name);
 527                 c->c_peer_name = NULL;
 528         }
 529         if(c->c_sock_name != NULL) {
 530                 free(c->c_sock_name);
 531                 c->c_sock_name = NULL;
 532         }
 533
 534         c->c_sasl_bind_in_progress = 0;
 535         if(c->c_sasl_bind_mech != NULL) {
 536                 free(c->c_sasl_bind_mech);
 537                 c->c_sasl_bind_mech = NULL;
 538         }
 539
 540         slap_sasl_close( c );
 541
 542         if ( c->c_currentber != NULL ) {
 543                 ber_free( c->c_currentber, 1 );
 544                 c->c_currentber = NULL;
 545         }
 546
 547         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 548         if ( sd != AC_SOCKET_INVALID ) {
 549                 slapd_remove( sd, 0 );
 550
 551                 Statslog( LDAP_DEBUG_STATS,
 552                     "conn=%ld fd=%d closed\n",
 553                         c->c_connid, sd, 0, 0, 0 );
 554         }
 555
 556         ber_sockbuf_free( c->c_sb );
 557         c->c_sb = ber_sockbuf_alloc( );
 558
 559     c->c_conn_state = SLAP_C_INVALID;
 560     c->c_struct_state = SLAP_C_UNUSED;
 561 }
 562
 563 int connection_state_closing( Connection *c )
 564 {
 565         /* c_mutex must be locked by caller */
 566
 567         int state;
 568         assert( c != NULL );
 569         assert( c->c_struct_state == SLAP_C_USED );
 570
 571         state = c->c_conn_state;
 572
 573         assert( state != SLAP_C_INVALID );
 574
 575         return state == SLAP_C_CLOSING;
 576 }
 577
 578 static void connection_abandon( Connection *c )
 579 {
 580         /* c_mutex must be locked by caller */
 581
 582         Operation *o;
 583
 584         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 585                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 586                 o->o_abandon = 1;
 587                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 588         }
 589
 590         /* remove pending operations */
 591         for( o = slap_op_pop( &c->c_pending_ops );
 592                 o != NULL;
 593                 o = slap_op_pop( &c->c_pending_ops ) )
 594         {
 595                 slap_op_free( o );
 596         }
 597 }
 598
 599 void connection_closing( Connection *c )
 600 {
 601         assert( connections != NULL );
 602         assert( c != NULL );
 603         assert( c->c_struct_state == SLAP_C_USED );
 604         assert( c->c_conn_state != SLAP_C_INVALID );
 605
 606         /* c_mutex must be locked by caller */
 607
 608         if( c->c_conn_state != SLAP_C_CLOSING ) {
 609                 ber_socket_t    sd;
 610
 611                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 612                 Debug( LDAP_DEBUG_TRACE,
 613                         "connection_closing: readying conn=%ld sd=%d for close\n",
 614                         c->c_connid, sd, 0 );
 615
 616                 /* update state to closing */
 617                 c->c_conn_state = SLAP_C_CLOSING;
 618
 619                 /* don't listen on this port anymore */
 620                 slapd_clr_read( sd, 1 );
 621
 622                 /* abandon active operations */
 623                 connection_abandon( c );
 624
 625                 /* wake write blocked operations */
 626                 slapd_clr_write( sd, 1 );
 627                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 628         }
 629 }
 630
 631 static void connection_close( Connection *c )
 632 {
 633         ber_socket_t    sd;
 634
 635         assert( connections != NULL );
 636         assert( c != NULL );
 637         assert( c->c_struct_state == SLAP_C_USED );
 638         assert( c->c_conn_state == SLAP_C_CLOSING );
 639
 640         /* note: connections_mutex and c_mutex should be locked by caller */
 641
 642         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 643         if( c->c_ops != NULL ) {
 644                 Debug( LDAP_DEBUG_TRACE,
 645                         "connection_close: deferring conn=%ld sd=%d\n",
 646                         c->c_connid, sd, 0 );
 647
 648                 return;
 649         }
 650
 651         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 652                 c->c_connid, sd, 0 );
 653
 654         connection_destroy( c );
 655 }
 656
 657 unsigned long connections_nextid(void)
 658 {
 659         unsigned long id;
 660         assert( connections != NULL );
 661
 662         ldap_pvt_thread_mutex_lock( &connections_mutex );
 663
 664         id = conn_nextid;
 665
 666         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 667
 668         return id;
 669 }
 670
 671 Connection* connection_first( ber_socket_t *index )
 672 {
 673         assert( connections != NULL );
 674         assert( index != NULL );
 675
 676         ldap_pvt_thread_mutex_lock( &connections_mutex );
 677
 678         *index = 0;
 679
 680         return connection_next(NULL, index);
 681 }
 682
 683 Connection* connection_next( Connection *c, ber_socket_t *index )
 684 {
 685         assert( connections != NULL );
 686         assert( index != NULL );
 687         assert( *index <= dtblsize );
 688
 689         if( c != NULL ) {
 690                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 691         }
 692
 693         c = NULL;
 694
 695         for(; *index < dtblsize; (*index)++) {
 696                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 697                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 698 #ifndef HAVE_WINSOCK
 699                         continue;
 700 #else
 701                         break;
 702 #endif
 703                 }
 704
 705                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 706                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 707                         c = &connections[(*index)++];
 708                         break;
 709                 }
 710
 711                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 712                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 713         }
 714
 715         if( c != NULL ) {
 716                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 717         }
 718
 719         return c;
 720 }
 721
 722 void connection_done( Connection *c )
 723 {
 724         assert( connections != NULL );
 725
 726         if( c != NULL ) {
 727                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 728         }
 729
 730         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 731 }
 732
 733 /*
 734  * connection_activity - handle the request operation op on connection
 735  * conn.  This routine figures out what kind of operation it is and
 736  * calls the appropriate stub to handle it.
 737  */
 738
 739 static void *
 740 connection_operation( void *arg_v )
 741 {
 742         int rc;
 743         struct co_arg   *arg = arg_v;
 744         ber_tag_t tag = arg->co_op->o_tag;
 745         Connection *conn = arg->co_conn;
 746
 747         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 748         num_ops_initiated++;
 749         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 750
 751         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 752                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 753                         "error: SASL bind in progress (tag=%ld).\n",
 754                         (long) tag, 0, 0 );
 755                 send_ldap_result( conn, arg->co_op,
 756                         rc = LDAP_OPERATIONS_ERROR,
 757                         NULL, "SASL bind in progress", NULL, NULL );
 758                 goto operations_error;
 759         }
 760
 761         switch ( tag ) {
 762         case LDAP_REQ_BIND:
 763                 rc = do_bind( conn, arg->co_op );
 764                 break;
 765
 766         case LDAP_REQ_UNBIND:
 767                 rc = do_unbind( conn, arg->co_op );
 768                 break;
 769
 770         case LDAP_REQ_ADD:
 771                 rc = do_add( conn, arg->co_op );
 772                 break;
 773
 774         case LDAP_REQ_DELETE:
 775                 rc = do_delete( conn, arg->co_op );
 776                 break;
 777
 778         case LDAP_REQ_MODRDN:
 779                 rc = do_modrdn( conn, arg->co_op );
 780                 break;
 781
 782         case LDAP_REQ_MODIFY:
 783                 rc = do_modify( conn, arg->co_op );
 784                 break;
 785
 786         case LDAP_REQ_COMPARE:
 787                 rc = do_compare( conn, arg->co_op );
 788                 break;
 789
 790         case LDAP_REQ_SEARCH:
 791                 rc = do_search( conn, arg->co_op );
 792                 break;
 793
 794         case LDAP_REQ_ABANDON:
 795                 rc = do_abandon( conn, arg->co_op );
 796                 break;
 797
 798         case LDAP_REQ_EXTENDED:
 799                 rc = do_extended( conn, arg->co_op );
 800                 break;
 801
 802         default:
 803                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 804                     tag, 0, 0 );
 805                 arg->co_op->o_tag = LBER_ERROR;
 806                 send_ldap_disconnect( conn, arg->co_op,
 807                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 808                 rc = -1;
 809                 break;
 810         }
 811
 812         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 813
 814 operations_error:
 815         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 816         num_ops_completed++;
 817         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 818
 819         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 820
 821         conn->c_n_ops_executing--;
 822         conn->c_n_ops_completed++;
 823
 824         slap_op_remove( &conn->c_ops, arg->co_op );
 825         slap_op_free( arg->co_op );
 826         arg->co_op = NULL;
 827         arg->co_conn = NULL;
 828         free( (char *) arg );
 829         arg = NULL;
 830
 831         switch( tag ) {
 832         case LBER_ERROR:
 833         case LDAP_REQ_UNBIND:
 834                 /* c_mutex is locked */
 835                 connection_closing( conn );
 836                 break;
 837
 838         case LDAP_REQ_BIND:
 839                 conn->c_sasl_bind_in_progress =
 840                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 841
 842                 if( conn->c_conn_state == SLAP_C_BINDING) {
 843                         conn->c_conn_state = SLAP_C_ACTIVE;
 844                 }
 845         }
 846
 847         connection_resched( conn );
 848
 849         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 850
 851         return NULL;
 852 }
 853
 854 int connection_read(ber_socket_t s)
 855 {
 856         int rc = 0;
 857         Connection *c;
 858         assert( connections != NULL );
 859
 860         ldap_pvt_thread_mutex_lock( &connections_mutex );
 861
 862         /* get (locked) connection */
 863         c = connection_get( s );
 864
 865         if( c == NULL ) {
 866                 Debug( LDAP_DEBUG_ANY,
 867                         "connection_read(%ld): no connection!\n",
 868                         (long) s, 0, 0 );
 869
 870                 slapd_remove(s, 0);
 871
 872                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 873                 return -1;
 874         }
 875
 876         c->c_n_read++;
 877
 878         if( c->c_conn_state == SLAP_C_CLOSING ) {
 879                 Debug( LDAP_DEBUG_TRACE,
 880                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 881                         s, c->c_connid, 0 );
 882
 883                 connection_return( c );
 884                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 885                 return 0;
 886         }
 887
 888         Debug( LDAP_DEBUG_TRACE,
 889                 "connection_read(%d): checking for input on id=%ld\n",
 890                 s, c->c_connid, 0 );
 891
 892 #ifdef HAVE_TLS
 893         if ( c->c_is_tls && c->c_needs_tls_accept ) {
 894                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
 895                 if ( rc < 0 ) {
 896                         struct timeval tv;
 897                         fd_set rfd;
 898
 899                         Debug( LDAP_DEBUG_TRACE,
 900                                 "connection_read(%d): TLS accept error "
 901                                 "error=%d id=%ld, closing\n",
 902                                 s, rc, c->c_connid );
 903
 904                         c->c_needs_tls_accept = 0;
 905                         /* connections_mutex and c_mutex are locked */
 906                         connection_closing( c );
 907
 908                         /* Drain input before close, to allow SSL error codes
 909                          * to propagate to client. */
 910                         FD_ZERO(&rfd);
 911                         FD_SET(s, &rfd);
 912                         for (rc=1; rc>0;)
 913                         {
 914                             tv.tv_sec = 1;
 915                             tv.tv_usec = 0;
 916                             rc = select(s+1, &rfd, NULL, NULL, &tv);
 917                             if (rc == 1)
 918                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
 919                                     NULL);
 920                         }
 921                         connection_close( c );
 922
 923                 } else if ( rc == 0 ) {
 924                         void *ssl;
 925                         unsigned ssf;
 926                         char *authid;
 927
 928                         c->c_needs_tls_accept = 0;
 929
 930                         /* we need to let SASL know */
 931                         ssl = (void *)ldap_pvt_tls_sb_handle( c->c_sb );
 932                         ssf = (unsigned)ldap_pvt_tls_get_strength( ssl );
 933                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
 934                         slap_sasl_external( c, ssf, authid );
 935                 }
 936                 connection_return( c );
 937                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 938                 return 0;
 939         }
 940 #endif
 941
 942 #ifdef HAVE_CYRUS_SASL
 943         if ( c->c_sasl_layers ) {
 944                 c->c_sasl_layers = 0;
 945
 946                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
 947
 948                 if( rc != LDAP_SUCCESS ) {
 949                         Debug( LDAP_DEBUG_TRACE,
 950                                 "connection_read(%d): SASL install error "
 951                                 "error=%d id=%ld, closing\n",
 952                                 s, rc, c->c_connid );
 953
 954                         /* connections_mutex and c_mutex are locked */
 955                         connection_closing( c );
 956                         connection_close( c );
 957                         connection_return( c );
 958                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 959                         return 0;
 960                 }
 961         }
 962 #endif
 963
 964 #define CONNECTION_INPUT_LOOP 1
 965
 966 #ifdef DATA_READY_LOOP
 967         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
 968 #elif CONNECTION_INPUT_LOOP
 969         while(!rc)
 970 #endif
 971         {
 972                 /* How do we do this without getting into a busy loop ? */
 973                 rc = connection_input( c );
 974         }
 975
 976         if( rc < 0 ) {
 977                 Debug( LDAP_DEBUG_TRACE,
 978                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 979                         s, rc, c->c_connid );
 980
 981                 /* connections_mutex and c_mutex are locked */
 982                 connection_closing( c );
 983                 connection_close( c );
 984         }
 985
 986         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
 987                 slapd_set_read( s, 1 );
 988         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
 989                 slapd_set_write( s, 1 );
 990         connection_return( c );
 991         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 992         return 0;
 993 }
 994
 995 static int
 996 connection_input(
 997     Connection *conn
 998 )
 999 {
1000         Operation *op;
1001         ber_tag_t       tag;
1002         ber_len_t       len;
1003         ber_int_t       msgid;
1004         BerElement      *ber;
1005
1006         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1007             == NULL ) {
1008                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1009                 return -1;
1010         }
1011
1012         errno = 0;
1013
1014         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1015         if ( tag != LDAP_TAG_MESSAGE ) {
1016                 int err = errno;
1017                 ber_socket_t    sd;
1018
1019                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1020
1021                 Debug( LDAP_DEBUG_TRACE,
1022                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1023                         sd, err, sock_errstr(err) );
1024
1025                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1026                         /* log, close and send error */
1027                         ber_free( conn->c_currentber, 1 );
1028                         conn->c_currentber = NULL;
1029
1030                         return -2;
1031                 }
1032                 return 1;
1033         }
1034
1035         ber = conn->c_currentber;
1036         conn->c_currentber = NULL;
1037
1038         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1039                 /* log, close and send error */
1040                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1041                     0 );
1042                 ber_free( ber, 1 );
1043                 return -1;
1044         }
1045
1046         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1047                 /* log, close and send error */
1048                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1049                     0 );
1050                 ber_free( ber, 1 );
1051
1052                 return -1;
1053         }
1054
1055         if(tag == LDAP_REQ_BIND) {
1056                 /* immediately abandon all exiting operations upon BIND */
1057                 connection_abandon( conn );
1058         }
1059
1060         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1061
1062         if ( conn->c_conn_state == SLAP_C_BINDING
1063                 || conn->c_conn_state == SLAP_C_CLOSING )
1064         {
1065                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1066                 conn->c_n_ops_pending++;
1067                 slap_op_add( &conn->c_pending_ops, op );
1068
1069         } else {
1070                 conn->c_n_ops_executing++;
1071                 connection_op_activate( conn, op );
1072         }
1073
1074 #ifdef NO_THREADS
1075         if ( conn->c_struct_state != SLAP_C_USED ) {
1076                 /* connection must have got closed underneath us */
1077                 return 1;
1078         }
1079 #endif
1080         assert( conn->c_struct_state == SLAP_C_USED );
1081
1082         return 0;
1083 }
1084
1085 static int
1086 connection_resched( Connection *conn )
1087 {
1088         Operation *op;
1089
1090         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1091                 ber_socket_t    sd;
1092
1093                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1094                 Debug( LDAP_DEBUG_TRACE,
1095                         "connection_resched: attempting closing conn=%ld sd=%d\n",
1096                         conn->c_connid, sd, 0 );
1097
1098                 ldap_pvt_thread_mutex_lock( &connections_mutex );
1099                 connection_close( conn );
1100                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1101                 return 0;
1102         }
1103
1104         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1105                 /* other states need different handling */
1106                 return 0;
1107         }
1108
1109         for( op = slap_op_pop( &conn->c_pending_ops );
1110                 op != NULL;
1111                 op = slap_op_pop( &conn->c_pending_ops ) )
1112         {
1113                 /* pending operations should not be marked for abandonment */
1114                 assert(!op->o_abandon);
1115
1116                 conn->c_n_ops_pending--;
1117                 conn->c_n_ops_executing++;
1118
1119                 connection_op_activate( conn, op );
1120
1121                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1122                         break;
1123                 }
1124         }
1125         return 0;
1126 }
1127
1128 static int connection_op_activate( Connection *conn, Operation *op )
1129 {
1130         struct co_arg *arg;
1131         int status;
1132         ber_tag_t tag = op->o_tag;
1133
1134         if(tag == LDAP_REQ_BIND) {
1135                 conn->c_conn_state = SLAP_C_BINDING;
1136         }
1137
1138         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1139         arg->co_conn = conn;
1140         arg->co_op = op;
1141
1142         arg->co_op->o_dn = ch_strdup( conn->c_dn != NULL ? conn->c_dn : "" );
1143         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1144         (void) dn_normalize( arg->co_op->o_ndn );
1145
1146         arg->co_op->o_protocol = conn->c_protocol;
1147         arg->co_op->o_connid = conn->c_connid;
1148
1149         arg->co_op->o_authtype = conn->c_authtype;
1150         arg->co_op->o_authmech = conn->c_authmech != NULL
1151                 ?  ch_strdup( conn->c_authmech ) : NULL;
1152
1153         slap_op_add( &conn->c_ops, arg->co_op );
1154
1155         status = ldap_pvt_thread_pool_submit( &connection_pool,
1156                 connection_operation, (void *) arg );
1157
1158         if ( status != 0 ) {
1159                 Debug( LDAP_DEBUG_ANY,
1160                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1161                 /* should move op to pending list */
1162         }
1163
1164         return status;
1165 }
1166
1167 int connection_write(ber_socket_t s)
1168 {
1169         Connection *c;
1170         assert( connections != NULL );
1171
1172         ldap_pvt_thread_mutex_lock( &connections_mutex );
1173
1174         c = connection_get( s );
1175
1176         slapd_clr_write( s, 0);
1177
1178         if( c == NULL ) {
1179                 Debug( LDAP_DEBUG_ANY,
1180                         "connection_write(%ld): no connection!\n",
1181                         (long) s, 0, 0 );
1182                 slapd_remove(s, 0);
1183                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1184                 return -1;
1185         }
1186
1187         c->c_n_write++;
1188
1189         Debug( LDAP_DEBUG_TRACE,
1190                 "connection_write(%d): waking output for id=%ld\n",
1191                 s, c->c_connid, 0 );
1192
1193         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1194
1195         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1196                 slapd_set_read( s, 1 );
1197         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1198                 slapd_set_write( s, 1 );
1199         connection_return( c );
1200         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1201         return 0;
1202 }