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 #include "lutil.h"
  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 #ifdef NEW_LOGGING
  77                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
  78                            "connections_init:  already initialized.\n" ));
  79 #else
  80                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  81                         0, 0, 0 );
  82 #endif
  83                 return -1;
  84         }
  85
  86         /* should check return of every call */
  87         ldap_pvt_thread_mutex_init( &connections_mutex );
  88
  89         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  90
  91         if( connections == NULL ) {
  92 #ifdef NEW_LOGGING
  93                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
  94                            "connections_init: allocation (%d * %ld) of connection array failed\n",
  95                            dtblsize, (long) sizeof(Connection) ));
  96 #else
  97                 Debug( LDAP_DEBUG_ANY,
  98                         "connections_init: allocation (%d*%ld) of connection array failed\n",
  99                         dtblsize, (long) sizeof(Connection), 0 );
 100 #endif
 101                 return -1;
 102         }
 103
 104     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 105     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 106
 107         /*
 108          * per entry initialization of the Connection array initialization
 109          * will be done by connection_init()
 110          */
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * Destroy connection management infrastructure.
 117  */
 118 int connections_destroy(void)
 119 {
 120         ber_socket_t i;
 121
 122         /* should check return of every call */
 123
 124         if( connections == NULL) {
 125 #ifdef NEW_LOGGING
 126                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 127                            "connections_destroy: nothing to destroy.\n"));
 128 #else
 129                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 130                         0, 0, 0 );
 131 #endif
 132                 return -1;
 133         }
 134
 135         for ( i = 0; i < dtblsize; i++ ) {
 136                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 137                         ber_sockbuf_free( connections[i].c_sb );
 138                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 139                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 140                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 141                 }
 142         }
 143
 144         free( connections );
 145         connections = NULL;
 146
 147         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 148         return 0;
 149 }
 150
 151 /*
 152  * shutdown all connections
 153  */
 154 int connections_shutdown(void)
 155 {
 156         ber_socket_t i;
 157
 158         ldap_pvt_thread_mutex_lock( &connections_mutex );
 159
 160         for ( i = 0; i < dtblsize; i++ ) {
 161                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 162                         continue;
 163                 }
 164
 165                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 166
 167                 /* connections_mutex and c_mutex are locked */
 168                 connection_closing( &connections[i] );
 169                 connection_close( &connections[i] );
 170
 171                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 172         }
 173
 174         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 175
 176         return 0;
 177 }
 178
 179 /*
 180  * Timeout idle connections.
 181  */
 182 int connections_timeout_idle(time_t now)
 183 {
 184         int i = 0;
 185         int connindex;
 186         Connection* c;
 187
 188         for( c = connection_first( &connindex );
 189                 c != NULL;
 190                 c = connection_next( c, &connindex ) )
 191         {
 192                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 193                         /* close it */
 194                         connection_closing( c );
 195                         connection_close( c );
 196                         i++;
 197                 }
 198         }
 199         connection_done( c );
 200
 201         return i;
 202 }
 203
 204 static Connection* connection_get( ber_socket_t s )
 205 {
 206         /* connections_mutex should be locked by caller */
 207
 208         Connection *c;
 209
 210 #ifdef NEW_LOGGING
 211         LDAP_LOG(( "connection", LDAP_LEVEL_ENTRY,
 212                    "connection_get: socket %ld\n", (long)s ));
 213 #else
 214         Debug( LDAP_DEBUG_ARGS,
 215                 "connection_get(%ld)\n",
 216                 (long) s, 0, 0 );
 217 #endif
 218
 219         assert( connections != NULL );
 220
 221         if(s == AC_SOCKET_INVALID) {
 222                 return NULL;
 223         }
 224
 225 #ifndef HAVE_WINSOCK
 226         c = &connections[s];
 227
 228         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 229
 230 #else
 231         c = NULL;
 232         {
 233                 ber_socket_t i, sd;
 234
 235                 for(i=0; i<dtblsize; i++) {
 236                         ber_sockbuf_ctrl( connections[i].c_sb,
 237                                 LBER_SB_OPT_GET_FD, &sd );
 238
 239                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 240                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 241                                 assert( connections[i].c_sb == 0 );
 242                                 break;
 243                         }
 244
 245                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 246                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 247                                 assert( sd == AC_SOCKET_INVALID );
 248                                 continue;
 249                         }
 250
 251                         /* state can actually change from used -> unused by resched,
 252                          * so don't assert details here.
 253                          */
 254
 255                         if( sd == s ) {
 256                                 c = &connections[i];
 257                                 break;
 258                         }
 259                 }
 260         }
 261 #endif
 262
 263         if( c != NULL ) {
 264                 ber_socket_t    sd;
 265
 266                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 267
 268                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 269                 if( c->c_struct_state != SLAP_C_USED ) {
 270                         /* connection must have been closed due to resched */
 271
 272                         assert( c->c_conn_state == SLAP_C_INVALID );
 273                         assert( sd == AC_SOCKET_INVALID );
 274
 275 #ifdef NEW_LOGGING
 276                         LDAP_LOG(( "connection", LDAP_LEVEL_ARGS,
 277                                    "connection_get:  connection %d not used\n", s ));
 278 #else
 279                         Debug( LDAP_DEBUG_TRACE,
 280                                 "connection_get(%d): connection not used\n",
 281                                 s, 0, 0 );
 282 #endif
 283
 284                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 285                         return NULL;
 286                 }
 287
 288 #ifdef NEW_LOGGING
 289                 LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 290                            "connection_get: get for %d got connid %ld\n",s, c->c_connid ));
 291 #else
 292                 Debug( LDAP_DEBUG_TRACE,
 293                         "connection_get(%d): got connid=%ld\n",
 294                         s, c->c_connid, 0 );
 295 #endif
 296
 297                 c->c_n_get++;
 298
 299                 assert( c->c_struct_state == SLAP_C_USED );
 300                 assert( c->c_conn_state != SLAP_C_INVALID );
 301                 assert( sd != AC_SOCKET_INVALID );
 302
 303         c->c_activitytime = slap_get_time();
 304         }
 305
 306         return c;
 307 }
 308
 309 static void connection_return( Connection *c )
 310 {
 311         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 312 }
 313
 314 long connection_init(
 315         ber_socket_t s,
 316         const char* url,
 317         const char* dnsname,
 318         const char* peername,
 319         const char* sockname,
 320         int tls_udp_option,
 321         slap_ssf_t ssf,
 322         const char *authid )
 323 {
 324         unsigned long id;
 325         Connection *c;
 326
 327         assert( connections != NULL );
 328
 329         assert( dnsname != NULL );
 330         assert( peername != NULL );
 331         assert( sockname != NULL );
 332
 333 #ifndef HAVE_TLS
 334         assert( tls_udp_option != 1 );
 335 #endif
 336
 337         if( s == AC_SOCKET_INVALID ) {
 338 #ifdef NEW_LOGGING
 339                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 340                            "connection_init: init of socket %ld invalid.\n", (long)s ));
 341 #else
 342                 Debug( LDAP_DEBUG_ANY,
 343                        "connection_init(%ld): invalid.\n",
 344                        (long) s, 0, 0 );
 345 #endif
 346                 return -1;
 347         }
 348
 349         assert( s >= 0 );
 350 #ifndef HAVE_WINSOCK
 351         assert( s < dtblsize );
 352 #endif
 353
 354         ldap_pvt_thread_mutex_lock( &connections_mutex );
 355
 356 #ifndef HAVE_WINSOCK
 357         c = &connections[s];
 358
 359 #else
 360         {
 361                 unsigned int i;
 362
 363                 c = NULL;
 364
 365         for( i=0; i < dtblsize; i++) {
 366                 ber_socket_t    sd;
 367
 368             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 369                 assert( connections[i].c_sb == 0 );
 370                 c = &connections[i];
 371                 break;
 372             }
 373
 374                         sd = AC_SOCKET_INVALID;
 375                         if (connections[i].c_sb != NULL)
 376                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 377
 378             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 379                 assert( sd == AC_SOCKET_INVALID );
 380                 c = &connections[i];
 381                 break;
 382             }
 383
 384             assert( connections[i].c_struct_state == SLAP_C_USED );
 385             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 386             assert( sd != AC_SOCKET_INVALID );
 387         }
 388
 389         if( c == NULL ) {
 390 #ifdef NEW_LOGGING
 391                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 392                            "connection_init: skt %d      connection table full (%d/%d)\n",
 393                            s, i, dtblsize ));
 394 #else
 395                 Debug( LDAP_DEBUG_ANY,
 396                                 "connection_init(%d): connection table full (%d/%d)\n",
 397                                 s, i, dtblsize);
 398 #endif
 399             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 400             return -1;
 401         }
 402     }
 403 #endif
 404
 405     assert( c != NULL );
 406
 407         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 408                 c->c_authmech = NULL;
 409                 c->c_dn = NULL;
 410                 c->c_cdn = NULL;
 411
 412                 c->c_listener_url = NULL;
 413                 c->c_peer_domain = NULL;
 414                 c->c_peer_name = NULL;
 415                 c->c_sock_name = NULL;
 416
 417                 c->c_ops = NULL;
 418                 c->c_pending_ops = NULL;
 419
 420                 c->c_sasl_bind_mech = NULL;
 421                 c->c_sasl_context = NULL;
 422                 c->c_sasl_extra = NULL;
 423
 424                 c->c_sb = ber_sockbuf_alloc( );
 425
 426                 {
 427                         ber_len_t max = sockbuf_max_incoming;
 428                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 429                 }
 430
 431                 c->c_currentber = NULL;
 432
 433                 /* should check status of thread calls */
 434                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 435                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 436                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 437
 438                 c->c_struct_state = SLAP_C_UNUSED;
 439         }
 440
 441     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 442
 443     assert( c->c_struct_state == SLAP_C_UNUSED );
 444         assert( c->c_authmech == NULL );
 445     assert(     c->c_dn == NULL );
 446     assert(     c->c_cdn == NULL );
 447     assert( c->c_listener_url == NULL );
 448     assert( c->c_peer_domain == NULL );
 449     assert( c->c_peer_name == NULL );
 450     assert( c->c_sock_name == NULL );
 451     assert( c->c_ops == NULL );
 452     assert( c->c_pending_ops == NULL );
 453         assert( c->c_sasl_bind_mech == NULL );
 454         assert( c->c_sasl_context == NULL );
 455         assert( c->c_sasl_extra == NULL );
 456         assert( c->c_currentber == NULL );
 457
 458         c->c_listener_url = ch_strdup( url  );
 459         c->c_peer_domain = ch_strdup( dnsname  );
 460     c->c_peer_name = ch_strdup( peername  );
 461     c->c_sock_name = ch_strdup( sockname );
 462
 463     c->c_n_ops_received = 0;
 464     c->c_n_ops_executing = 0;
 465     c->c_n_ops_pending = 0;
 466     c->c_n_ops_completed = 0;
 467
 468         c->c_n_get = 0;
 469         c->c_n_read = 0;
 470         c->c_n_write = 0;
 471
 472         /* set to zero until bind, implies LDAP_VERSION3 */
 473         c->c_protocol = 0;
 474
 475     c->c_activitytime = c->c_starttime = slap_get_time();
 476
 477 #ifdef LDAP_CONNECTIONLESS
 478         c->c_is_udp = 0;
 479         if (tls_udp_option == 2)
 480         {
 481                 c->c_is_udp = 1;
 482 #ifdef LDAP_DEBUG
 483         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 484                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 485 #endif
 486         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 487                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 488         } else
 489 #endif
 490         {
 491 #ifdef LDAP_DEBUG
 492         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 493                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 494 #endif
 495         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 496                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 497         }
 498         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 499                 LBER_SBIOD_LEVEL_PROVIDER, NULL );
 500
 501 #ifdef LDAP_DEBUG
 502         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 503                 INT_MAX, (void*)"ldap_" );
 504 #endif
 505
 506         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 507                 c /* non-NULL */ ) < 0 )
 508         {
 509 #ifdef NEW_LOGGING
 510                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 511                            "connection_init: conn %d  set nonblocking failed\n",
 512                            c->c_connid ));
 513 #else
 514                 Debug( LDAP_DEBUG_ANY,
 515                         "connection_init(%d, %s): set nonblocking failed\n",
 516                         s, c->c_peer_name, 0 );
 517 #endif
 518         }
 519
 520     id = c->c_connid = conn_nextid++;
 521
 522     c->c_conn_state = SLAP_C_INACTIVE;
 523     c->c_struct_state = SLAP_C_USED;
 524
 525         c->c_ssf = c->c_transport_ssf = ssf;
 526         c->c_tls_ssf = 0;
 527
 528 #ifdef HAVE_TLS
 529     if ( tls_udp_option == 1 ) {
 530             c->c_is_tls = 1;
 531             c->c_needs_tls_accept = 1;
 532     } else {
 533             c->c_is_tls = 0;
 534             c->c_needs_tls_accept = 0;
 535     }
 536 #endif
 537
 538         slap_sasl_open( c );
 539         slap_sasl_external( c, ssf, authid );
 540
 541     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 542     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 543
 544     backend_connection_init(c);
 545
 546     return id;
 547 }
 548
 549 void connection2anonymous( Connection *c )
 550 {
 551     assert( connections != NULL );
 552     assert( c != NULL );
 553
 554         {
 555                 ber_len_t max = sockbuf_max_incoming;
 556                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 557         }
 558
 559         if(c->c_authmech != NULL ) {
 560                 free(c->c_authmech);
 561                 c->c_authmech = NULL;
 562         }
 563
 564     if(c->c_dn != NULL) {
 565         free(c->c_dn);
 566         c->c_dn = NULL;
 567     }
 568
 569         if(c->c_cdn != NULL) {
 570                 free(c->c_cdn);
 571                 c->c_cdn = NULL;
 572         }
 573
 574         c->c_authc_backend = NULL;
 575         c->c_authz_backend = NULL;
 576 }
 577
 578 static void
 579 connection_destroy( Connection *c )
 580 {
 581         /* note: connections_mutex should be locked by caller */
 582     ber_socket_t        sd;
 583
 584     assert( connections != NULL );
 585     assert( c != NULL );
 586     assert( c->c_struct_state != SLAP_C_UNUSED );
 587     assert( c->c_conn_state != SLAP_C_INVALID );
 588     assert( c->c_ops == NULL );
 589
 590     backend_connection_destroy(c);
 591
 592     c->c_protocol = 0;
 593     c->c_connid = -1;
 594
 595     c->c_activitytime = c->c_starttime = 0;
 596
 597         connection2anonymous( c );
 598
 599         if(c->c_listener_url != NULL) {
 600                 free(c->c_listener_url);
 601                 c->c_listener_url = NULL;
 602         }
 603
 604         if(c->c_peer_domain != NULL) {
 605                 free(c->c_peer_domain);
 606                 c->c_peer_domain = NULL;
 607         }
 608         if(c->c_peer_name != NULL) {
 609 #ifdef LDAP_PF_lOCAL
 610                 /*
 611                  * If peer was a domain socket, unlink. Mind you,
 612                  * they may be un-named. Should we leave this to
 613                  * the client?
 614                  */
 615                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 616                         char *path = c->c_peer_name + 5;
 617                         if (path != '\0') {
 618                                 (void)unlink(path);
 619                         }
 620                 }
 621 #endif /* LDAP_PF_LOCAL */
 622
 623                 free(c->c_peer_name);
 624                 c->c_peer_name = NULL;
 625         }
 626         if(c->c_sock_name != NULL) {
 627                 free(c->c_sock_name);
 628                 c->c_sock_name = NULL;
 629         }
 630
 631         c->c_sasl_bind_in_progress = 0;
 632         if(c->c_sasl_bind_mech != NULL) {
 633                 free(c->c_sasl_bind_mech);
 634                 c->c_sasl_bind_mech = NULL;
 635         }
 636
 637         slap_sasl_close( c );
 638
 639         if ( c->c_currentber != NULL ) {
 640                 ber_free( c->c_currentber, 1 );
 641                 c->c_currentber = NULL;
 642         }
 643
 644         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 645         if ( sd != AC_SOCKET_INVALID ) {
 646                 slapd_remove( sd, 0 );
 647
 648                 Statslog( LDAP_DEBUG_STATS,
 649                     "conn=%ld fd=%d closed\n",
 650                         c->c_connid, sd, 0, 0, 0 );
 651         }
 652
 653         ber_sockbuf_free( c->c_sb );
 654
 655         c->c_sb = ber_sockbuf_alloc( );
 656
 657         {
 658                 ber_len_t max = sockbuf_max_incoming;
 659                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 660         }
 661
 662     c->c_conn_state = SLAP_C_INVALID;
 663     c->c_struct_state = SLAP_C_UNUSED;
 664 }
 665
 666 int connection_state_closing( Connection *c )
 667 {
 668         /* c_mutex must be locked by caller */
 669
 670         int state;
 671         assert( c != NULL );
 672         assert( c->c_struct_state == SLAP_C_USED );
 673
 674         state = c->c_conn_state;
 675
 676         assert( state != SLAP_C_INVALID );
 677
 678         return state == SLAP_C_CLOSING;
 679 }
 680
 681 static void connection_abandon( Connection *c )
 682 {
 683         /* c_mutex must be locked by caller */
 684
 685         Operation *o;
 686
 687         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 688                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 689                 o->o_abandon = 1;
 690                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 691         }
 692
 693         /* remove pending operations */
 694         for( o = slap_op_pop( &c->c_pending_ops );
 695                 o != NULL;
 696                 o = slap_op_pop( &c->c_pending_ops ) )
 697         {
 698                 slap_op_free( o );
 699         }
 700 }
 701
 702 void connection_closing( Connection *c )
 703 {
 704         assert( connections != NULL );
 705         assert( c != NULL );
 706         assert( c->c_struct_state == SLAP_C_USED );
 707         assert( c->c_conn_state != SLAP_C_INVALID );
 708
 709         /* c_mutex must be locked by caller */
 710
 711         if( c->c_conn_state != SLAP_C_CLOSING ) {
 712                 ber_socket_t    sd;
 713
 714                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 715 #ifdef NEW_LOGGING
 716                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 717                            "connection_closing: conn %d readying socket %d for close.\n",
 718                            c->c_connid, sd ));
 719 #else
 720                 Debug( LDAP_DEBUG_TRACE,
 721                         "connection_closing: readying conn=%ld sd=%d for close\n",
 722                         c->c_connid, sd, 0 );
 723 #endif
 724                 /* update state to closing */
 725                 c->c_conn_state = SLAP_C_CLOSING;
 726
 727                 /* don't listen on this port anymore */
 728                 slapd_clr_read( sd, 1 );
 729
 730                 /* abandon active operations */
 731                 connection_abandon( c );
 732
 733                 /* wake write blocked operations */
 734                 slapd_clr_write( sd, 1 );
 735                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 736         }
 737 }
 738
 739 static void connection_close( Connection *c )
 740 {
 741         ber_socket_t    sd;
 742
 743         assert( connections != NULL );
 744         assert( c != NULL );
 745         assert( c->c_struct_state == SLAP_C_USED );
 746         assert( c->c_conn_state == SLAP_C_CLOSING );
 747
 748         /* note: connections_mutex and c_mutex should be locked by caller */
 749
 750         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 751         if( c->c_ops != NULL ) {
 752 #ifdef NEW_LOGGING
 753                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 754                            "connection_close: conn %d  deferring sd %d\n",
 755                            c->c_connid, sd ));
 756 #else
 757                 Debug( LDAP_DEBUG_TRACE,
 758                         "connection_close: deferring conn=%ld sd=%d\n",
 759                         c->c_connid, sd, 0 );
 760 #endif
 761                 return;
 762         }
 763
 764 #ifdef NEW_LOGGING
 765         LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 766                    "connection_close: conn %d  sd %d\n",
 767                    c->c_connid, sd ));
 768 #else
 769         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 770                 c->c_connid, sd, 0 );
 771 #endif
 772         connection_destroy( c );
 773 }
 774
 775 unsigned long connections_nextid(void)
 776 {
 777         unsigned long id;
 778         assert( connections != NULL );
 779
 780         ldap_pvt_thread_mutex_lock( &connections_mutex );
 781
 782         id = conn_nextid;
 783
 784         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 785
 786         return id;
 787 }
 788
 789 Connection* connection_first( ber_socket_t *index )
 790 {
 791         assert( connections != NULL );
 792         assert( index != NULL );
 793
 794         ldap_pvt_thread_mutex_lock( &connections_mutex );
 795
 796         *index = 0;
 797
 798         return connection_next(NULL, index);
 799 }
 800
 801 Connection* connection_next( Connection *c, ber_socket_t *index )
 802 {
 803         assert( connections != NULL );
 804         assert( index != NULL );
 805         assert( *index <= dtblsize );
 806
 807         if( c != NULL ) {
 808                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 809         }
 810
 811         c = NULL;
 812
 813         for(; *index < dtblsize; (*index)++) {
 814                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 815                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 816 #ifndef HAVE_WINSOCK
 817                         continue;
 818 #else
 819                         break;
 820 #endif
 821                 }
 822
 823                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 824                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 825                         c = &connections[(*index)++];
 826                         break;
 827                 }
 828
 829                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 830                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 831         }
 832
 833         if( c != NULL ) {
 834                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 835         }
 836
 837         return c;
 838 }
 839
 840 void connection_done( Connection *c )
 841 {
 842         assert( connections != NULL );
 843
 844         if( c != NULL ) {
 845                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 846         }
 847
 848         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 849 }
 850
 851 /*
 852  * connection_activity - handle the request operation op on connection
 853  * conn.  This routine figures out what kind of operation it is and
 854  * calls the appropriate stub to handle it.
 855  */
 856
 857 static void *
 858 connection_operation( void *arg_v )
 859 {
 860         int rc;
 861         struct co_arg   *arg = arg_v;
 862         ber_tag_t tag = arg->co_op->o_tag;
 863         Connection *conn = arg->co_conn;
 864
 865         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 866         num_ops_initiated++;
 867         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 868
 869         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 870 #ifdef NEW_LOGGING
 871                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
 872                            "connection_operation: conn %d  SASL bind in progress (tag=%ld).\n",
 873                            conn->c_connid, (long)tag ));
 874 #else
 875                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 876                         "error: SASL bind in progress (tag=%ld).\n",
 877                         (long) tag, 0, 0 );
 878 #endif
 879                 send_ldap_result( conn, arg->co_op,
 880                         rc = LDAP_OPERATIONS_ERROR,
 881                         NULL, "SASL bind in progress", NULL, NULL );
 882                 goto operations_error;
 883         }
 884
 885         switch ( tag ) {
 886         case LDAP_REQ_BIND:
 887                 rc = do_bind( conn, arg->co_op );
 888                 break;
 889
 890         case LDAP_REQ_UNBIND:
 891                 rc = do_unbind( conn, arg->co_op );
 892                 break;
 893
 894         case LDAP_REQ_ADD:
 895                 rc = do_add( conn, arg->co_op );
 896                 break;
 897
 898         case LDAP_REQ_DELETE:
 899                 rc = do_delete( conn, arg->co_op );
 900                 break;
 901
 902         case LDAP_REQ_MODRDN:
 903                 rc = do_modrdn( conn, arg->co_op );
 904                 break;
 905
 906         case LDAP_REQ_MODIFY:
 907                 rc = do_modify( conn, arg->co_op );
 908                 break;
 909
 910         case LDAP_REQ_COMPARE:
 911                 rc = do_compare( conn, arg->co_op );
 912                 break;
 913
 914         case LDAP_REQ_SEARCH:
 915                 rc = do_search( conn, arg->co_op );
 916                 break;
 917
 918         case LDAP_REQ_ABANDON:
 919                 rc = do_abandon( conn, arg->co_op );
 920                 break;
 921
 922         case LDAP_REQ_EXTENDED:
 923                 rc = do_extended( conn, arg->co_op );
 924                 break;
 925
 926         default:
 927 #ifdef NEW_LOGGING
 928                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 929                            "connection_operation: conn %d  unknown LDAP request 0x%lx\n",
 930                            conn->c_connid, tag ));
 931 #else
 932                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 933                     tag, 0, 0 );
 934 #endif
 935                 arg->co_op->o_tag = LBER_ERROR;
 936                 send_ldap_disconnect( conn, arg->co_op,
 937                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 938                 rc = -1;
 939                 break;
 940         }
 941
 942         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 943
 944 operations_error:
 945         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 946         num_ops_completed++;
 947         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 948
 949         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 950
 951         conn->c_n_ops_executing--;
 952         conn->c_n_ops_completed++;
 953
 954         slap_op_remove( &conn->c_ops, arg->co_op );
 955         slap_op_free( arg->co_op );
 956         arg->co_op = NULL;
 957         arg->co_conn = NULL;
 958         free( (char *) arg );
 959         arg = NULL;
 960
 961         switch( tag ) {
 962         case LBER_ERROR:
 963         case LDAP_REQ_UNBIND:
 964                 /* c_mutex is locked */
 965                 connection_closing( conn );
 966                 break;
 967
 968         case LDAP_REQ_BIND:
 969                 conn->c_sasl_bind_in_progress =
 970                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
 971
 972                 if( conn->c_conn_state == SLAP_C_BINDING) {
 973                         conn->c_conn_state = SLAP_C_ACTIVE;
 974                 }
 975         }
 976
 977         connection_resched( conn );
 978
 979         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 980
 981         return NULL;
 982 }
 983
 984 int connection_read(ber_socket_t s)
 985 {
 986         int rc = 0;
 987         Connection *c;
 988         assert( connections != NULL );
 989
 990         ldap_pvt_thread_mutex_lock( &connections_mutex );
 991
 992         /* get (locked) connection */
 993         c = connection_get( s );
 994
 995         if( c == NULL ) {
 996 #ifdef NEW_LOGGING
 997                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 998                            "connection_read: sock %ld no connection\n",
 999                            (long)s ));
1000 #else
1001                 Debug( LDAP_DEBUG_ANY,
1002                         "connection_read(%ld): no connection!\n",
1003                         (long) s, 0, 0 );
1004 #endif
1005                 slapd_remove(s, 0);
1006
1007                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1008                 return -1;
1009         }
1010
1011         c->c_n_read++;
1012
1013         if( c->c_conn_state == SLAP_C_CLOSING ) {
1014 #ifdef NEW_LOGGING
1015                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1016                            "connection_read: conn %d connection closing, ignoring input\n",
1017                            c->c_connid));
1018 #else
1019                 Debug( LDAP_DEBUG_TRACE,
1020                         "connection_read(%d): closing, ignoring input for id=%ld\n",
1021                         s, c->c_connid, 0 );
1022 #endif
1023                 connection_return( c );
1024                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1025                 return 0;
1026         }
1027
1028 #ifdef NEW_LOGGING
1029         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1030                    "connection_read: conn %d  checking for input.\n", c->c_connid ));
1031 #else
1032         Debug( LDAP_DEBUG_TRACE,
1033                 "connection_read(%d): checking for input on id=%ld\n",
1034                 s, c->c_connid, 0 );
1035 #endif
1036
1037 #ifdef HAVE_TLS
1038         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1039                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
1040                 if ( rc < 0 ) {
1041                         struct timeval tv;
1042                         fd_set rfd;
1043
1044 #ifdef NEW_LOGGING
1045                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1046                                    "connection_read: conn %d  TLS accept error, error %d\n",
1047                                    c->c_connid, rc ));
1048 #else
1049                         Debug( LDAP_DEBUG_TRACE,
1050                                 "connection_read(%d): TLS accept error "
1051                                 "error=%d id=%ld, closing\n",
1052                                 s, rc, c->c_connid );
1053 #endif
1054                         c->c_needs_tls_accept = 0;
1055                         /* connections_mutex and c_mutex are locked */
1056                         connection_closing( c );
1057
1058 #if 0
1059                         /* Drain input before close, to allow SSL error codes
1060                          * to propagate to client. */
1061                         FD_ZERO(&rfd);
1062                         FD_SET(s, &rfd);
1063                         for (rc=1; rc>0;)
1064                         {
1065                             tv.tv_sec = 1;
1066                             tv.tv_usec = 0;
1067                             rc = select(s+1, &rfd, NULL, NULL, &tv);
1068                             if (rc == 1)
1069                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
1070                                     NULL);
1071                         }
1072 #endif
1073                         connection_close( c );
1074
1075                 } else if ( rc == 0 ) {
1076                         void *ssl;
1077                         char *authid;
1078
1079                         c->c_needs_tls_accept = 0;
1080
1081                         /* we need to let SASL know */
1082                         ssl = (void *)ldap_pvt_tls_sb_ctx( c->c_sb );
1083
1084                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1085                         if( c->c_tls_ssf > c->c_ssf ) {
1086                                 c->c_ssf = c->c_tls_ssf;
1087                         }
1088
1089                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
1090                         slap_sasl_external( c, c->c_tls_ssf, authid );
1091                 }
1092                 connection_return( c );
1093                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1094                 return 0;
1095         }
1096 #endif
1097
1098 #ifdef HAVE_CYRUS_SASL
1099         if ( c->c_sasl_layers ) {
1100                 c->c_sasl_layers = 0;
1101
1102                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
1103
1104                 if( rc != LDAP_SUCCESS ) {
1105 #ifdef NEW_LOGGING
1106                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1107                                    "connection_read: conn %d SASL install error %d, closing\n",
1108                                    c->c_connid, rc ));
1109 #else
1110                         Debug( LDAP_DEBUG_TRACE,
1111                                 "connection_read(%d): SASL install error "
1112                                 "error=%d id=%ld, closing\n",
1113                                 s, rc, c->c_connid );
1114 #endif
1115                         /* connections_mutex and c_mutex are locked */
1116                         connection_closing( c );
1117                         connection_close( c );
1118                         connection_return( c );
1119                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1120                         return 0;
1121                 }
1122         }
1123 #endif
1124
1125 #define CONNECTION_INPUT_LOOP 1
1126
1127 #ifdef DATA_READY_LOOP
1128         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
1129 #elif CONNECTION_INPUT_LOOP
1130         while(!rc)
1131 #endif
1132         {
1133                 /* How do we do this without getting into a busy loop ? */
1134                 rc = connection_input( c );
1135         }
1136
1137         if( rc < 0 ) {
1138 #ifdef NEW_LOGGING
1139                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1140                            "connection_read: conn %d  input error %d, closing.\n",
1141                            c->c_connid, rc ));
1142 #else
1143                 Debug( LDAP_DEBUG_TRACE,
1144                         "connection_read(%d): input error=%d id=%ld, closing.\n",
1145                         s, rc, c->c_connid );
1146 #endif
1147                 /* connections_mutex and c_mutex are locked */
1148                 connection_closing( c );
1149                 connection_close( c );
1150                 connection_return( c );
1151                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1152                 return 0;
1153         }
1154
1155         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1156                 slapd_set_read( s, 1 );
1157         }
1158
1159         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1160                 slapd_set_write( s, 1 );
1161         }
1162
1163         connection_return( c );
1164         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1165         return 0;
1166 }
1167
1168 static int
1169 connection_input(
1170     Connection *conn
1171 )
1172 {
1173         Operation *op;
1174         ber_tag_t       tag;
1175         ber_len_t       len;
1176         ber_int_t       msgid;
1177         BerElement      *ber;
1178 #ifdef LDAP_CONNECTIONLESS
1179         Sockaddr        peeraddr;
1180         char            *cdn = NULL;
1181 #endif
1182
1183         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1184             == NULL ) {
1185 #ifdef NEW_LOGGING
1186                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1187                            "connection_input: conn %d  ber_alloc failed.\n", conn->c_connid ));
1188 #else
1189                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1190 #endif
1191                 return -1;
1192         }
1193
1194         errno = 0;
1195
1196 #ifdef LDAP_CONNECTIONLESS
1197         if (conn->c_is_udp)
1198         {
1199                 char    peername[sizeof("IP=255.255.255.255:65336")];
1200                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1201                         sizeof(struct sockaddr));
1202                 sprintf( peername, "IP=%s:%d",
1203                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1204                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1205                 Statslog( LDAP_DEBUG_STATS,
1206                             "conn=%ld UDP request from %s (%s) accepted.\n",
1207                             conn->c_connid, peername,
1208                             conn->c_sock_name, 0, 0 );
1209         }
1210 #endif
1211         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1212         if ( tag != LDAP_TAG_MESSAGE ) {
1213                 int err = errno;
1214                 ber_socket_t    sd;
1215
1216                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1217
1218 #ifdef NEW_LOGGING
1219                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1220                            "connection_input: conn %d  ber_get_next failed, errno %d (%s).\n",
1221                            conn->c_connid, err, sock_errstr(err) ));
1222 #else
1223                 Debug( LDAP_DEBUG_TRACE,
1224                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1225                         sd, err, sock_errstr(err) );
1226 #endif
1227                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1228                         /* log, close and send error */
1229                         ber_free( conn->c_currentber, 1 );
1230                         conn->c_currentber = NULL;
1231
1232                         return -2;
1233                 }
1234                 return 1;
1235         }
1236
1237         ber = conn->c_currentber;
1238         conn->c_currentber = NULL;
1239
1240         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1241                 /* log, close and send error */
1242 #ifdef NEW_LOGGING
1243                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1244                            "connection_input: conn %d  ber_get_int returns 0x%lx.\n",
1245                            conn->c_connid, tag ));
1246 #else
1247                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1248                     0 );
1249 #endif
1250                 ber_free( ber, 1 );
1251                 return -1;
1252         }
1253 #ifdef LDAP_CONNECTIONLESS
1254         if (conn->c_is_udp) {
1255                 tag = ber_get_stringa( ber, &cdn );
1256         }
1257 #endif
1258
1259         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1260                 /* log, close and send error */
1261 #ifdef NEW_LOGGING
1262                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1263                            "connection_input: conn %d  ber_peek_tag returns 0x%lx.\n",
1264                            conn->c_connid, tag ));
1265 #else
1266                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1267                     0 );
1268 #endif
1269                 ber_free( ber, 1 );
1270
1271                 return -1;
1272         }
1273
1274 #ifdef LDAP_CONNECTIONLESS
1275         if (conn->c_is_udp && (tag != LDAP_REQ_ABANDON &&
1276                 tag != LDAP_REQ_SEARCH))
1277         {
1278 #ifdef NEW_LOGGING
1279                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1280                            "connection_input: conn %d  invalid req for UDP 0x%lx.\n",
1281                            conn->c_connid, tag ));
1282 #else
1283                 Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0,
1284                     0 );
1285 #endif
1286                 ber_free( ber, 1 );
1287                 return 0;
1288         }
1289 #endif
1290         if(tag == LDAP_REQ_BIND) {
1291                 /* immediately abandon all exiting operations upon BIND */
1292                 connection_abandon( conn );
1293         }
1294
1295         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1296
1297 #ifdef LDAP_CONNECTIONLESS
1298         op->o_peeraddr = peeraddr;
1299         op->o_dn = cdn;
1300 #endif
1301         if ( conn->c_conn_state == SLAP_C_BINDING
1302                 || conn->c_conn_state == SLAP_C_CLOSING )
1303         {
1304 #ifdef NEW_LOGGING
1305                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1306                            "connection_input: conn %d  deferring operation\n",
1307                            conn->c_connid ));
1308 #else
1309                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1310 #endif
1311                 conn->c_n_ops_pending++;
1312                 slap_op_add( &conn->c_pending_ops, op );
1313
1314         } else {
1315                 conn->c_n_ops_executing++;
1316                 connection_op_activate( conn, op );
1317         }
1318
1319 #ifdef NO_THREADS
1320         if ( conn->c_struct_state != SLAP_C_USED ) {
1321                 /* connection must have got closed underneath us */
1322                 return 1;
1323         }
1324 #endif
1325         assert( conn->c_struct_state == SLAP_C_USED );
1326
1327         return 0;
1328 }
1329
1330 static int
1331 connection_resched( Connection *conn )
1332 {
1333         Operation *op;
1334
1335         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1336                 int rc;
1337                 ber_socket_t    sd;
1338                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1339
1340                 /* us trylock to avoid possible deadlock */
1341                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1342
1343                 if( rc ) {
1344 #ifdef NEW_LOGGING
1345                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1346                                    "connection_resched: conn %d  reaquiring locks.\n",
1347                                    conn->c_connid ));
1348 #else
1349                         Debug( LDAP_DEBUG_TRACE,
1350                                 "connection_resched: reaquiring locks conn=%ld sd=%d\n",
1351                                 conn->c_connid, sd, 0 );
1352 #endif
1353                         /*
1354                          * reaquire locks in the right order...
1355                          * this may allow another thread to close this connection,
1356                          * so recheck state below.
1357                          */
1358                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1359                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1360                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1361                 }
1362
1363                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1364 #ifdef NEW_LOGGING
1365                         LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1366                                    "connection_resched: conn %d  closed by other thread.\n",
1367                                    conn->c_connid ));
1368 #else
1369                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1370                                 "closed by other thread conn=%ld sd=%d\n",
1371                                 conn->c_connid, sd, 0 );
1372 #endif
1373                 } else {
1374 #ifdef NEW_LOGGING
1375                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1376                                    "connection_resched: conn %d  attempting closing.\n",
1377                                    conn->c_connid ));
1378 #else
1379                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1380                                 "attempting closing conn=%ld sd=%d\n",
1381                                 conn->c_connid, sd, 0 );
1382 #endif
1383                         connection_close( conn );
1384                 }
1385
1386                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1387                 return 0;
1388         }
1389
1390         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1391                 /* other states need different handling */
1392                 return 0;
1393         }
1394
1395         for( op = slap_op_pop( &conn->c_pending_ops );
1396                 op != NULL;
1397                 op = slap_op_pop( &conn->c_pending_ops ) )
1398         {
1399                 /* pending operations should not be marked for abandonment */
1400                 assert(!op->o_abandon);
1401
1402                 conn->c_n_ops_pending--;
1403                 conn->c_n_ops_executing++;
1404
1405                 connection_op_activate( conn, op );
1406
1407                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1408                         break;
1409                 }
1410         }
1411         return 0;
1412 }
1413
1414 static int connection_op_activate( Connection *conn, Operation *op )
1415 {
1416         struct co_arg *arg;
1417         int status;
1418         ber_tag_t tag = op->o_tag;
1419
1420         if(tag == LDAP_REQ_BIND) {
1421                 conn->c_conn_state = SLAP_C_BINDING;
1422         }
1423
1424         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1425         arg->co_conn = conn;
1426         arg->co_op = op;
1427
1428         if (!arg->co_op->o_dn) {
1429             arg->co_op->o_authz = conn->c_authz;
1430             arg->co_op->o_dn = ch_strdup( conn->c_dn != NULL ? conn->c_dn : "" );
1431         }
1432         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1433         (void) dn_normalize( arg->co_op->o_ndn );
1434         arg->co_op->o_authtype = conn->c_authtype;
1435         arg->co_op->o_authmech = conn->c_authmech != NULL
1436                 ?  ch_strdup( conn->c_authmech ) : NULL;
1437
1438         arg->co_op->o_protocol = conn->c_protocol
1439                 ? conn->c_protocol : LDAP_VERSION3;
1440         arg->co_op->o_connid = conn->c_connid;
1441
1442         slap_op_add( &conn->c_ops, arg->co_op );
1443
1444         status = ldap_pvt_thread_pool_submit( &connection_pool,
1445                 connection_operation, (void *) arg );
1446
1447         if ( status != 0 ) {
1448 #ifdef NEW_LOGGING
1449                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1450                            "connection_op_activate: conn %d      thread pool submit failed.\n",
1451                            conn->c_connid ));
1452 #else
1453                 Debug( LDAP_DEBUG_ANY,
1454                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1455 #endif
1456                 /* should move op to pending list */
1457         }
1458
1459         return status;
1460 }
1461
1462 int connection_write(ber_socket_t s)
1463 {
1464         Connection *c;
1465         assert( connections != NULL );
1466
1467         ldap_pvt_thread_mutex_lock( &connections_mutex );
1468
1469         c = connection_get( s );
1470
1471         slapd_clr_write( s, 0);
1472
1473         if( c == NULL ) {
1474 #ifdef NEW_LOGGING
1475                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1476                            "connection_write: sock %ld  no connection!\n",(long)s));
1477 #else
1478                 Debug( LDAP_DEBUG_ANY,
1479                         "connection_write(%ld): no connection!\n",
1480                         (long) s, 0, 0 );
1481 #endif
1482                 slapd_remove(s, 0);
1483                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1484                 return -1;
1485         }
1486
1487         c->c_n_write++;
1488
1489 #ifdef NEW_LOGGING
1490         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1491                    "connection_write conn %d  waking output.\n",
1492                    c->c_connid ));
1493 #else
1494         Debug( LDAP_DEBUG_TRACE,
1495                 "connection_write(%d): waking output for id=%ld\n",
1496                 s, c->c_connid, 0 );
1497 #endif
1498         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1499
1500         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1501                 slapd_set_read( s, 1 );
1502         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1503                 slapd_set_write( s, 1 );
1504         connection_return( c );
1505         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1506         return 0;
1507 }
1508
1509
1510 /*
1511  * Create client side and server side connection structures, connected to
1512  * one another, for the front end to use for searches on arbitrary back ends.
1513  */
1514
1515 int connection_internal_open( Connection **conn, LDAP **ldp, const char *id )
1516 {
1517         int rc;
1518         ber_socket_t fd[2] = {-1,-1};
1519         Operation *op;
1520
1521         *conn=NULL;
1522         *ldp=NULL;
1523
1524         rc = lutil_pair( fd );
1525         if( rc == -1 ) {
1526                 return LDAP_OTHER;
1527         }
1528
1529         rc = connection_init( fd[1], "INT", "localhost",
1530       "localhost:0", "localhost:00", 0, 256, id );
1531         if( rc < 0 ) {
1532                 tcp_close( fd[0] );
1533                 tcp_close( fd[1] );
1534                 return LDAP_OTHER;
1535         }
1536         slapd_add_internal( fd[1] );
1537
1538         /* A search operation, number 0 */
1539         op = slap_op_alloc( NULL, 0, LDAP_REQ_SEARCH, 0);
1540         op->o_ndn = ch_strdup( id );
1541         op->o_protocol = LDAP_VERSION3;
1542
1543         (*conn) = connection_get( fd[1] );
1544         (*conn)->c_ops = op;
1545     (*conn)->c_conn_state = SLAP_C_ACTIVE;
1546
1547
1548         /* Create the client side of the connection */
1549         rc = ldap_open_internal_connection( ldp, &(fd[0]) );
1550         if( rc != LDAP_SUCCESS ) {
1551                 tcp_close( fd[0] );
1552                 return LDAP_OTHER;
1553         }
1554
1555         /* The connection_get() will have locked the connection's mutex */
1556         ldap_pvt_thread_mutex_unlock(  &((*conn)->c_mutex) );
1557
1558         return LDAP_SUCCESS;
1559 }
1560
1561
1562 void connection_internal_close( Connection *conn )
1563 {
1564         Operation *op = conn->c_ops;
1565
1566         slap_op_remove( &conn->c_ops, op );
1567         slap_op_free( op );
1568         connection_closing( conn );
1569         connection_close( conn );
1570 }