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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2002 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 #include <ac/unistd.h>
  18
  19 #include "ldap_pvt.h"
  20 #include "lutil.h"
  21 #include "slap.h"
  22
  23 /* protected by connections_mutex */
  24 static ldap_pvt_thread_mutex_t connections_mutex;
  25 static Connection *connections = NULL;
  26 static unsigned long conn_nextid = 0;
  27
  28 /* structure state (protected by connections_mutex) */
  29 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  30 #define SLAP_C_UNUSED                   0x01
  31 #define SLAP_C_USED                             0x02
  32
  33 /* connection state (protected by c_mutex ) */
  34 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  35 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  36 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  37 #define SLAP_C_BINDING                  0x03    /* binding */
  38 #define SLAP_C_CLOSING                  0x04    /* closing */
  39
  40 const char *
  41 connection_state2str( int state )
  42 {
  43         switch( state ) {
  44         case SLAP_C_INVALID:    return "!";
  45         case SLAP_C_INACTIVE:   return "|";
  46         case SLAP_C_ACTIVE:             return "";
  47         case SLAP_C_BINDING:    return "B";
  48         case SLAP_C_CLOSING:    return "C";
  49         }
  50
  51         return "?";
  52 }
  53
  54 static Connection* connection_get( ber_socket_t s );
  55
  56 static int connection_input( Connection *c );
  57 static void connection_close( Connection *c );
  58
  59 static int connection_op_activate( Connection *conn, Operation *op );
  60 static int connection_resched( Connection *conn );
  61 static void connection_abandon( Connection *conn );
  62 static void connection_destroy( Connection *c );
  63
  64 struct co_arg {
  65         Connection      *co_conn;
  66         Operation       *co_op;
  67 };
  68
  69 /*
  70  * Initialize connection management infrastructure.
  71  */
  72 int connections_init(void)
  73 {
  74         assert( connections == NULL );
  75
  76         if( connections != NULL) {
  77 #ifdef NEW_LOGGING
  78                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
  79                            "connections_init:  already initialized.\n" ));
  80 #else
  81                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  82                         0, 0, 0 );
  83 #endif
  84                 return -1;
  85         }
  86
  87         /* should check return of every call */
  88         ldap_pvt_thread_mutex_init( &connections_mutex );
  89
  90         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  91
  92         if( connections == NULL ) {
  93 #ifdef NEW_LOGGING
  94                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
  95                            "connections_init: allocation (%d * %ld) of connection array failed\n",
  96                            dtblsize, (long) sizeof(Connection) ));
  97 #else
  98                 Debug( LDAP_DEBUG_ANY,
  99                         "connections_init: allocation (%d*%ld) of connection array failed\n",
 100                         dtblsize, (long) sizeof(Connection), 0 );
 101 #endif
 102                 return -1;
 103         }
 104
 105     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 106     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 107
 108         /*
 109          * per entry initialization of the Connection array initialization
 110          * will be done by connection_init()
 111          */
 112
 113         return 0;
 114 }
 115
 116 /*
 117  * Destroy connection management infrastructure.
 118  */
 119 int connections_destroy(void)
 120 {
 121         ber_socket_t i;
 122
 123         /* should check return of every call */
 124
 125         if( connections == NULL) {
 126 #ifdef NEW_LOGGING
 127                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 128                            "connections_destroy: nothing to destroy.\n"));
 129 #else
 130                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 131                         0, 0, 0 );
 132 #endif
 133                 return -1;
 134         }
 135
 136         for ( i = 0; i < dtblsize; i++ ) {
 137                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 138                         ber_sockbuf_free( connections[i].c_sb );
 139                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 140                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 141                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 142                 }
 143         }
 144
 145         free( connections );
 146         connections = NULL;
 147
 148         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 149         return 0;
 150 }
 151
 152 /*
 153  * shutdown all connections
 154  */
 155 int connections_shutdown(void)
 156 {
 157         ber_socket_t i;
 158
 159         ldap_pvt_thread_mutex_lock( &connections_mutex );
 160
 161         for ( i = 0; i < dtblsize; i++ ) {
 162                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 163                         continue;
 164                 }
 165
 166                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 167
 168                 /* connections_mutex and c_mutex are locked */
 169                 connection_closing( &connections[i] );
 170                 connection_close( &connections[i] );
 171
 172                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 173         }
 174
 175         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 176
 177         return 0;
 178 }
 179
 180 /*
 181  * Timeout idle connections.
 182  */
 183 int connections_timeout_idle(time_t now)
 184 {
 185         int i = 0;
 186         int connindex;
 187         Connection* c;
 188
 189         for( c = connection_first( &connindex );
 190                 c != NULL;
 191                 c = connection_next( c, &connindex ) )
 192         {
 193                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 194                         /* close it */
 195                         connection_closing( c );
 196                         connection_close( c );
 197                         i++;
 198                 }
 199         }
 200         connection_done( c );
 201
 202         return i;
 203 }
 204
 205 static Connection* connection_get( ber_socket_t s )
 206 {
 207         /* connections_mutex should be locked by caller */
 208
 209         Connection *c;
 210
 211 #ifdef NEW_LOGGING
 212         LDAP_LOG(( "connection", LDAP_LEVEL_ENTRY,
 213                    "connection_get: socket %ld\n", (long)s ));
 214 #else
 215         Debug( LDAP_DEBUG_ARGS,
 216                 "connection_get(%ld)\n",
 217                 (long) s, 0, 0 );
 218 #endif
 219
 220         assert( connections != NULL );
 221
 222         if(s == AC_SOCKET_INVALID) {
 223                 return NULL;
 224         }
 225
 226 #ifndef HAVE_WINSOCK
 227         c = &connections[s];
 228
 229         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 230
 231 #else
 232         c = NULL;
 233         {
 234                 ber_socket_t i, sd;
 235
 236                 for(i=0; i<dtblsize; i++) {
 237                         ber_sockbuf_ctrl( connections[i].c_sb,
 238                                 LBER_SB_OPT_GET_FD, &sd );
 239
 240                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 241                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 242                                 assert( connections[i].c_sb == 0 );
 243                                 break;
 244                         }
 245
 246                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 247                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 248                                 assert( sd == AC_SOCKET_INVALID );
 249                                 continue;
 250                         }
 251
 252                         /* state can actually change from used -> unused by resched,
 253                          * so don't assert details here.
 254                          */
 255
 256                         if( sd == s ) {
 257                                 c = &connections[i];
 258                                 break;
 259                         }
 260                 }
 261         }
 262 #endif
 263
 264         if( c != NULL ) {
 265                 ber_socket_t    sd;
 266
 267                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 268
 269                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 270                 if( c->c_struct_state != SLAP_C_USED ) {
 271                         /* connection must have been closed due to resched */
 272
 273                         assert( c->c_conn_state == SLAP_C_INVALID );
 274                         assert( sd == AC_SOCKET_INVALID );
 275
 276 #ifdef NEW_LOGGING
 277                         LDAP_LOG(( "connection", LDAP_LEVEL_ARGS,
 278                                    "connection_get:  connection %d not used\n", s ));
 279 #else
 280                         Debug( LDAP_DEBUG_TRACE,
 281                                 "connection_get(%d): connection not used\n",
 282                                 s, 0, 0 );
 283 #endif
 284
 285                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 286                         return NULL;
 287                 }
 288
 289 #ifdef NEW_LOGGING
 290                 LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 291                            "connection_get: get for %d got connid %ld\n",s, c->c_connid ));
 292 #else
 293                 Debug( LDAP_DEBUG_TRACE,
 294                         "connection_get(%d): got connid=%ld\n",
 295                         s, c->c_connid, 0 );
 296 #endif
 297
 298                 c->c_n_get++;
 299
 300                 assert( c->c_struct_state == SLAP_C_USED );
 301                 assert( c->c_conn_state != SLAP_C_INVALID );
 302                 assert( sd != AC_SOCKET_INVALID );
 303
 304 #ifdef SLAPD_MONITOR
 305                 c->c_activitytime = slap_get_time();
 306 #else
 307                 if( global_idletimeout > 0 ) {
 308                         c->c_activitytime = slap_get_time();
 309                 }
 310 #endif
 311         }
 312
 313         return c;
 314 }
 315
 316 static void connection_return( Connection *c )
 317 {
 318         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 319 }
 320
 321 long connection_init(
 322         ber_socket_t s,
 323         const char* url,
 324         const char* dnsname,
 325         const char* peername,
 326         const char* sockname,
 327         int tls_udp_option,
 328         slap_ssf_t ssf,
 329         const char *authid )
 330 {
 331         unsigned long id;
 332         Connection *c;
 333
 334         assert( connections != NULL );
 335
 336         assert( dnsname != NULL );
 337         assert( peername != NULL );
 338         assert( sockname != NULL );
 339
 340 #ifndef HAVE_TLS
 341         assert( tls_udp_option != 1 );
 342 #endif
 343
 344         if( s == AC_SOCKET_INVALID ) {
 345 #ifdef NEW_LOGGING
 346                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 347                            "connection_init: init of socket %ld invalid.\n", (long)s ));
 348 #else
 349                 Debug( LDAP_DEBUG_ANY,
 350                        "connection_init(%ld): invalid.\n",
 351                        (long) s, 0, 0 );
 352 #endif
 353                 return -1;
 354         }
 355
 356         assert( s >= 0 );
 357 #ifndef HAVE_WINSOCK
 358         assert( s < dtblsize );
 359 #endif
 360
 361         ldap_pvt_thread_mutex_lock( &connections_mutex );
 362
 363 #ifndef HAVE_WINSOCK
 364         c = &connections[s];
 365
 366 #else
 367         {
 368                 ber_socket_t    i;
 369
 370                 c = NULL;
 371
 372         for( i=0; i < dtblsize; i++) {
 373                 ber_socket_t    sd;
 374
 375             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 376                 assert( connections[i].c_sb == 0 );
 377                 c = &connections[i];
 378                 break;
 379             }
 380
 381                         sd = AC_SOCKET_INVALID;
 382                         if (connections[i].c_sb != NULL)
 383                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 384
 385             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 386                 assert( sd == AC_SOCKET_INVALID );
 387                 c = &connections[i];
 388                 break;
 389             }
 390
 391             assert( connections[i].c_struct_state == SLAP_C_USED );
 392             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 393             assert( sd != AC_SOCKET_INVALID );
 394         }
 395
 396         if( c == NULL ) {
 397 #ifdef NEW_LOGGING
 398                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 399                            "connection_init: skt %d      connection table full (%d/%d)\n",
 400                            s, i, dtblsize ));
 401 #else
 402                 Debug( LDAP_DEBUG_ANY,
 403                                 "connection_init(%d): connection table full (%d/%d)\n",
 404                                 s, i, dtblsize);
 405 #endif
 406             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 407             return -1;
 408         }
 409     }
 410 #endif
 411
 412     assert( c != NULL );
 413
 414         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 415                 c->c_authmech.bv_val = NULL;
 416                 c->c_authmech.bv_len = 0;
 417                 c->c_dn.bv_val = NULL;
 418                 c->c_dn.bv_len = 0;
 419                 c->c_ndn.bv_val = NULL;
 420                 c->c_ndn.bv_len = 0;
 421                 c->c_cdn.bv_val = NULL;
 422                 c->c_cdn.bv_len = 0;
 423                 c->c_groups = NULL;
 424
 425                 c->c_listener_url = NULL;
 426                 c->c_peer_domain = NULL;
 427                 c->c_peer_name = NULL;
 428                 c->c_sock_name = NULL;
 429
 430                 LDAP_STAILQ_INIT(&c->c_ops);
 431                 LDAP_STAILQ_INIT(&c->c_pending_ops);
 432
 433                 c->c_sasl_bind_mech.bv_val = NULL;
 434                 c->c_sasl_bind_mech.bv_len = 0;
 435                 c->c_sasl_context = NULL;
 436                 c->c_sasl_extra = NULL;
 437
 438                 c->c_sb = ber_sockbuf_alloc( );
 439
 440                 {
 441                         ber_len_t max = sockbuf_max_incoming;
 442                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 443                 }
 444
 445                 c->c_currentber = NULL;
 446
 447                 /* should check status of thread calls */
 448                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 449                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 450                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 451
 452                 c->c_struct_state = SLAP_C_UNUSED;
 453         }
 454
 455     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 456
 457     assert( c->c_struct_state == SLAP_C_UNUSED );
 458     assert( c->c_authmech.bv_val == NULL );
 459     assert( c->c_dn.bv_val == NULL );
 460     assert( c->c_ndn.bv_val == NULL );
 461     assert( c->c_cdn.bv_val == NULL );
 462     assert( c->c_groups == NULL );
 463     assert( c->c_listener_url == NULL );
 464     assert( c->c_peer_domain == NULL );
 465     assert( c->c_peer_name == NULL );
 466     assert( c->c_sock_name == NULL );
 467     assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 468     assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
 469         assert( c->c_sasl_bind_mech.bv_val == NULL );
 470         assert( c->c_sasl_context == NULL );
 471         assert( c->c_sasl_extra == NULL );
 472         assert( c->c_currentber == NULL );
 473
 474         c->c_listener_url = ch_strdup( url  );
 475         c->c_peer_domain = ch_strdup( dnsname  );
 476     c->c_peer_name = ch_strdup( peername  );
 477     c->c_sock_name = ch_strdup( sockname );
 478
 479     c->c_n_ops_received = 0;
 480     c->c_n_ops_executing = 0;
 481     c->c_n_ops_pending = 0;
 482     c->c_n_ops_completed = 0;
 483
 484         c->c_n_get = 0;
 485         c->c_n_read = 0;
 486         c->c_n_write = 0;
 487
 488         /* set to zero until bind, implies LDAP_VERSION3 */
 489         c->c_protocol = 0;
 490
 491 #ifdef SLAPD_MONITOR
 492         c->c_activitytime = c->c_starttime = slap_get_time();
 493 #else
 494         if( global_idletimeout > 0 ) {
 495                 c->c_activitytime = c->c_starttime = slap_get_time();
 496         }
 497 #endif
 498
 499 #ifdef LDAP_CONNECTIONLESS
 500         c->c_is_udp = 0;
 501         if (tls_udp_option == 2)
 502         {
 503                 c->c_is_udp = 1;
 504 #ifdef LDAP_DEBUG
 505         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 506                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 507 #endif
 508         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 509                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 510         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 511                 LBER_SBIOD_LEVEL_PROVIDER, NULL );
 512         } else
 513 #endif
 514         {
 515 #ifdef LDAP_DEBUG
 516         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 517                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 518 #endif
 519         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 520                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 521         }
 522
 523 #ifdef LDAP_DEBUG
 524         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 525                 INT_MAX, (void*)"ldap_" );
 526 #endif
 527
 528         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 529                 c /* non-NULL */ ) < 0 )
 530         {
 531 #ifdef NEW_LOGGING
 532                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 533                            "connection_init: conn %d  set nonblocking failed\n",
 534                            c->c_connid ));
 535 #else
 536                 Debug( LDAP_DEBUG_ANY,
 537                         "connection_init(%d, %s): set nonblocking failed\n",
 538                         s, c->c_peer_name, 0 );
 539 #endif
 540         }
 541
 542     id = c->c_connid = conn_nextid++;
 543
 544     c->c_conn_state = SLAP_C_INACTIVE;
 545     c->c_struct_state = SLAP_C_USED;
 546
 547         c->c_ssf = c->c_transport_ssf = ssf;
 548         c->c_tls_ssf = 0;
 549
 550 #ifdef HAVE_TLS
 551     if ( tls_udp_option == 1 ) {
 552             c->c_is_tls = 1;
 553             c->c_needs_tls_accept = 1;
 554     } else {
 555             c->c_is_tls = 0;
 556             c->c_needs_tls_accept = 0;
 557     }
 558 #endif
 559
 560         slap_sasl_open( c );
 561         slap_sasl_external( c, ssf, authid );
 562
 563     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 564     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 565
 566     backend_connection_init(c);
 567
 568     return id;
 569 }
 570
 571 void connection2anonymous( Connection *c )
 572 {
 573     assert( connections != NULL );
 574     assert( c != NULL );
 575
 576         {
 577                 ber_len_t max = sockbuf_max_incoming;
 578                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 579         }
 580
 581         if(c->c_authmech.bv_val != NULL ) {
 582                 free(c->c_authmech.bv_val);
 583                 c->c_authmech.bv_val = NULL;
 584         }
 585         c->c_authmech.bv_len = 0;
 586
 587     if(c->c_dn.bv_val != NULL) {
 588         free(c->c_dn.bv_val);
 589         c->c_dn.bv_val = NULL;
 590     }
 591     c->c_dn.bv_len = 0;
 592     if(c->c_ndn.bv_val != NULL) {
 593         free(c->c_ndn.bv_val);
 594         c->c_ndn.bv_val = NULL;
 595     }
 596     c->c_ndn.bv_len = 0;
 597
 598         if(c->c_cdn.bv_val != NULL) {
 599                 free(c->c_cdn.bv_val);
 600                 c->c_cdn.bv_val = NULL;
 601         }
 602         c->c_cdn.bv_len = 0;
 603
 604         c->c_authc_backend = NULL;
 605         c->c_authz_backend = NULL;
 606
 607     {
 608         GroupAssertion *g, *n;
 609         for (g = c->c_groups; g; g=n)
 610         {
 611             n = g->next;
 612             free(g);
 613         }
 614         c->c_groups = NULL;
 615     }
 616
 617 }
 618
 619 static void
 620 connection_destroy( Connection *c )
 621 {
 622         /* note: connections_mutex should be locked by caller */
 623     ber_socket_t        sd;
 624
 625     assert( connections != NULL );
 626     assert( c != NULL );
 627     assert( c->c_struct_state != SLAP_C_UNUSED );
 628     assert( c->c_conn_state != SLAP_C_INVALID );
 629     assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
 630
 631     backend_connection_destroy(c);
 632
 633     c->c_protocol = 0;
 634     c->c_connid = -1;
 635
 636     c->c_activitytime = c->c_starttime = 0;
 637
 638         connection2anonymous( c );
 639
 640         if(c->c_listener_url != NULL) {
 641                 free(c->c_listener_url);
 642                 c->c_listener_url = NULL;
 643         }
 644
 645         if(c->c_peer_domain != NULL) {
 646                 free(c->c_peer_domain);
 647                 c->c_peer_domain = NULL;
 648         }
 649         if(c->c_peer_name != NULL) {
 650 #ifdef LDAP_PF_lOCAL
 651                 /*
 652                  * If peer was a domain socket, unlink. Mind you,
 653                  * they may be un-named. Should we leave this to
 654                  * the client?
 655                  */
 656                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 657                         char *path = c->c_peer_name + 5;
 658                         if (path != '\0') {
 659                                 (void)unlink(path);
 660                         }
 661                 }
 662 #endif /* LDAP_PF_LOCAL */
 663
 664                 free(c->c_peer_name);
 665                 c->c_peer_name = NULL;
 666         }
 667         if(c->c_sock_name != NULL) {
 668                 free(c->c_sock_name);
 669                 c->c_sock_name = NULL;
 670         }
 671
 672         c->c_sasl_bind_in_progress = 0;
 673         if(c->c_sasl_bind_mech.bv_val != NULL) {
 674                 free(c->c_sasl_bind_mech.bv_val);
 675                 c->c_sasl_bind_mech.bv_val = NULL;
 676         }
 677         c->c_sasl_bind_mech.bv_len = 0;
 678
 679         slap_sasl_close( c );
 680
 681         if ( c->c_currentber != NULL ) {
 682                 ber_free( c->c_currentber, 1 );
 683                 c->c_currentber = NULL;
 684         }
 685
 686         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 687         if ( sd != AC_SOCKET_INVALID ) {
 688                 slapd_remove( sd, 0 );
 689
 690                 Statslog( LDAP_DEBUG_STATS,
 691                     "conn=%ld fd=%d closed\n",
 692                         c->c_connid, sd, 0, 0, 0 );
 693         }
 694
 695         ber_sockbuf_free( c->c_sb );
 696
 697         c->c_sb = ber_sockbuf_alloc( );
 698
 699         {
 700                 ber_len_t max = sockbuf_max_incoming;
 701                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 702         }
 703
 704     c->c_conn_state = SLAP_C_INVALID;
 705     c->c_struct_state = SLAP_C_UNUSED;
 706 }
 707
 708 int connection_state_closing( Connection *c )
 709 {
 710         /* c_mutex must be locked by caller */
 711
 712         int state;
 713         assert( c != NULL );
 714         assert( c->c_struct_state == SLAP_C_USED );
 715
 716         state = c->c_conn_state;
 717
 718         assert( state != SLAP_C_INVALID );
 719
 720         return state == SLAP_C_CLOSING;
 721 }
 722
 723 static void connection_abandon( Connection *c )
 724 {
 725         /* c_mutex must be locked by caller */
 726
 727         Operation *o;
 728
 729         LDAP_STAILQ_FOREACH(o, &c->c_ops, o_next) {
 730                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 731                 o->o_abandon = 1;
 732                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 733         }
 734
 735         /* remove pending operations */
 736         while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
 737                 LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
 738                 LDAP_STAILQ_NEXT(o, o_next) = NULL;
 739                 slap_op_free( o );
 740         }
 741 }
 742
 743 void connection_closing( Connection *c )
 744 {
 745         assert( connections != NULL );
 746         assert( c != NULL );
 747         assert( c->c_struct_state == SLAP_C_USED );
 748         assert( c->c_conn_state != SLAP_C_INVALID );
 749
 750         /* c_mutex must be locked by caller */
 751
 752         if( c->c_conn_state != SLAP_C_CLOSING ) {
 753                 ber_socket_t    sd;
 754
 755                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 756 #ifdef NEW_LOGGING
 757                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 758                            "connection_closing: conn %d readying socket %d for close.\n",
 759                            c->c_connid, sd ));
 760 #else
 761                 Debug( LDAP_DEBUG_TRACE,
 762                         "connection_closing: readying conn=%ld sd=%d for close\n",
 763                         c->c_connid, sd, 0 );
 764 #endif
 765                 /* update state to closing */
 766                 c->c_conn_state = SLAP_C_CLOSING;
 767
 768                 /* don't listen on this port anymore */
 769                 slapd_clr_read( sd, 1 );
 770
 771                 /* abandon active operations */
 772                 connection_abandon( c );
 773
 774                 /* wake write blocked operations */
 775                 slapd_clr_write( sd, 1 );
 776                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 777         }
 778 }
 779
 780 static void connection_close( Connection *c )
 781 {
 782         ber_socket_t    sd;
 783
 784         assert( connections != NULL );
 785         assert( c != NULL );
 786         assert( c->c_struct_state == SLAP_C_USED );
 787         assert( c->c_conn_state == SLAP_C_CLOSING );
 788
 789         /* note: connections_mutex and c_mutex should be locked by caller */
 790
 791         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 792         if( !LDAP_STAILQ_EMPTY(&c->c_ops) ) {
 793 #ifdef NEW_LOGGING
 794                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 795                            "connection_close: conn %d  deferring sd %d\n",
 796                            c->c_connid, sd ));
 797 #else
 798                 Debug( LDAP_DEBUG_TRACE,
 799                         "connection_close: deferring conn=%ld sd=%d\n",
 800                         c->c_connid, sd, 0 );
 801 #endif
 802                 return;
 803         }
 804
 805 #ifdef NEW_LOGGING
 806         LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 807                    "connection_close: conn %d  sd %d\n",
 808                    c->c_connid, sd ));
 809 #else
 810         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 811                 c->c_connid, sd, 0 );
 812 #endif
 813         connection_destroy( c );
 814 }
 815
 816 unsigned long connections_nextid(void)
 817 {
 818         unsigned long id;
 819         assert( connections != NULL );
 820
 821         ldap_pvt_thread_mutex_lock( &connections_mutex );
 822
 823         id = conn_nextid;
 824
 825         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 826
 827         return id;
 828 }
 829
 830 Connection* connection_first( ber_socket_t *index )
 831 {
 832         assert( connections != NULL );
 833         assert( index != NULL );
 834
 835         ldap_pvt_thread_mutex_lock( &connections_mutex );
 836
 837         *index = 0;
 838
 839         return connection_next(NULL, index);
 840 }
 841
 842 Connection* connection_next( Connection *c, ber_socket_t *index )
 843 {
 844         assert( connections != NULL );
 845         assert( index != NULL );
 846         assert( *index <= dtblsize );
 847
 848         if( c != NULL ) {
 849                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 850         }
 851
 852         c = NULL;
 853
 854         for(; *index < dtblsize; (*index)++) {
 855                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 856                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 857 #ifndef HAVE_WINSOCK
 858                         continue;
 859 #else
 860                         break;
 861 #endif
 862                 }
 863
 864                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 865                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 866                         c = &connections[(*index)++];
 867                         break;
 868                 }
 869
 870                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 871                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 872         }
 873
 874         if( c != NULL ) {
 875                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 876         }
 877
 878         return c;
 879 }
 880
 881 void connection_done( Connection *c )
 882 {
 883         assert( connections != NULL );
 884
 885         if( c != NULL ) {
 886                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 887         }
 888
 889         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 890 }
 891
 892 /*
 893  * connection_activity - handle the request operation op on connection
 894  * conn.  This routine figures out what kind of operation it is and
 895  * calls the appropriate stub to handle it.
 896  */
 897
 898 static void *
 899 connection_operation( void *arg_v )
 900 {
 901         int rc;
 902         struct co_arg   *arg = arg_v;
 903         ber_tag_t tag = arg->co_op->o_tag;
 904         Connection *conn = arg->co_conn;
 905
 906         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 907         num_ops_initiated++;
 908         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 909
 910         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 911 #ifdef NEW_LOGGING
 912                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
 913                            "connection_operation: conn %d  SASL bind in progress (tag=%ld).\n",
 914                            conn->c_connid, (long)tag ));
 915 #else
 916                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 917                         "error: SASL bind in progress (tag=%ld).\n",
 918                         (long) tag, 0, 0 );
 919 #endif
 920                 send_ldap_result( conn, arg->co_op,
 921                         rc = LDAP_OPERATIONS_ERROR,
 922                         NULL, "SASL bind in progress", NULL, NULL );
 923                 goto operations_error;
 924         }
 925
 926         switch ( tag ) {
 927         case LDAP_REQ_BIND:
 928                 rc = do_bind( conn, arg->co_op );
 929                 break;
 930
 931         case LDAP_REQ_UNBIND:
 932                 rc = do_unbind( conn, arg->co_op );
 933                 break;
 934
 935         case LDAP_REQ_ADD:
 936                 rc = do_add( conn, arg->co_op );
 937                 break;
 938
 939         case LDAP_REQ_DELETE:
 940                 rc = do_delete( conn, arg->co_op );
 941                 break;
 942
 943         case LDAP_REQ_MODRDN:
 944                 rc = do_modrdn( conn, arg->co_op );
 945                 break;
 946
 947         case LDAP_REQ_MODIFY:
 948                 rc = do_modify( conn, arg->co_op );
 949                 break;
 950
 951         case LDAP_REQ_COMPARE:
 952                 rc = do_compare( conn, arg->co_op );
 953                 break;
 954
 955         case LDAP_REQ_SEARCH:
 956                 rc = do_search( conn, arg->co_op );
 957                 break;
 958
 959         case LDAP_REQ_ABANDON:
 960                 rc = do_abandon( conn, arg->co_op );
 961                 break;
 962
 963         case LDAP_REQ_EXTENDED:
 964                 rc = do_extended( conn, arg->co_op );
 965                 break;
 966
 967         default:
 968 #ifdef NEW_LOGGING
 969                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 970                            "connection_operation: conn %d  unknown LDAP request 0x%lx\n",
 971                            conn->c_connid, tag ));
 972 #else
 973                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 974                     tag, 0, 0 );
 975 #endif
 976                 arg->co_op->o_tag = LBER_ERROR;
 977                 send_ldap_disconnect( conn, arg->co_op,
 978                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 979                 rc = -1;
 980                 break;
 981         }
 982
 983         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 984
 985 operations_error:
 986         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 987         num_ops_completed++;
 988         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 989
 990         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 991
 992         conn->c_n_ops_executing--;
 993         conn->c_n_ops_completed++;
 994
 995         LDAP_STAILQ_REMOVE( &conn->c_ops, arg->co_op, slap_op, o_next);
 996         LDAP_STAILQ_NEXT(arg->co_op, o_next) = NULL;
 997         slap_op_free( arg->co_op );
 998         arg->co_op = NULL;
 999         arg->co_conn = NULL;
1000         free( (char *) arg );
1001         arg = NULL;
1002
1003         switch( tag ) {
1004         case LBER_ERROR:
1005         case LDAP_REQ_UNBIND:
1006                 /* c_mutex is locked */
1007                 connection_closing( conn );
1008                 break;
1009
1010         case LDAP_REQ_BIND:
1011                 conn->c_sasl_bind_in_progress =
1012                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1013
1014                 if( conn->c_conn_state == SLAP_C_BINDING) {
1015                         conn->c_conn_state = SLAP_C_ACTIVE;
1016                 }
1017         }
1018
1019         connection_resched( conn );
1020
1021         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1022
1023         return NULL;
1024 }
1025
1026 int connection_read(ber_socket_t s)
1027 {
1028         int rc = 0;
1029         Connection *c;
1030         assert( connections != NULL );
1031
1032         ldap_pvt_thread_mutex_lock( &connections_mutex );
1033
1034         /* get (locked) connection */
1035         c = connection_get( s );
1036
1037         if( c == NULL ) {
1038 #ifdef NEW_LOGGING
1039                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1040                            "connection_read: sock %ld no connection\n",
1041                            (long)s ));
1042 #else
1043                 Debug( LDAP_DEBUG_ANY,
1044                         "connection_read(%ld): no connection!\n",
1045                         (long) s, 0, 0 );
1046 #endif
1047                 slapd_remove(s, 0);
1048
1049                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1050                 return -1;
1051         }
1052
1053         c->c_n_read++;
1054
1055         if( c->c_conn_state == SLAP_C_CLOSING ) {
1056 #ifdef NEW_LOGGING
1057                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1058                            "connection_read: conn %d connection closing, ignoring input\n",
1059                            c->c_connid));
1060 #else
1061                 Debug( LDAP_DEBUG_TRACE,
1062                         "connection_read(%d): closing, ignoring input for id=%ld\n",
1063                         s, c->c_connid, 0 );
1064 #endif
1065                 connection_return( c );
1066                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1067                 return 0;
1068         }
1069
1070 #ifdef NEW_LOGGING
1071         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1072                    "connection_read: conn %d  checking for input.\n", c->c_connid ));
1073 #else
1074         Debug( LDAP_DEBUG_TRACE,
1075                 "connection_read(%d): checking for input on id=%ld\n",
1076                 s, c->c_connid, 0 );
1077 #endif
1078
1079 #ifdef HAVE_TLS
1080         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1081                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
1082                 if ( rc < 0 ) {
1083 #if 0 /* required by next #if 0 */
1084                         struct timeval tv;
1085                         fd_set rfd;
1086 #endif
1087
1088 #ifdef NEW_LOGGING
1089                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1090                                    "connection_read: conn %d  TLS accept error, error %d\n",
1091                                    c->c_connid, rc ));
1092 #else
1093                         Debug( LDAP_DEBUG_TRACE,
1094                                 "connection_read(%d): TLS accept error "
1095                                 "error=%d id=%ld, closing\n",
1096                                 s, rc, c->c_connid );
1097 #endif
1098                         c->c_needs_tls_accept = 0;
1099                         /* connections_mutex and c_mutex are locked */
1100                         connection_closing( c );
1101
1102 #if 0
1103                         /* Drain input before close, to allow SSL error codes
1104                          * to propagate to client. */
1105                         FD_ZERO(&rfd);
1106                         FD_SET(s, &rfd);
1107                         for (rc=1; rc>0;)
1108                         {
1109                             tv.tv_sec = 1;
1110                             tv.tv_usec = 0;
1111                             rc = select(s+1, &rfd, NULL, NULL, &tv);
1112                             if (rc == 1)
1113                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
1114                                     NULL);
1115                         }
1116 #endif
1117                         connection_close( c );
1118
1119                 } else if ( rc == 0 ) {
1120                         void *ssl;
1121                         char *authid;
1122
1123                         c->c_needs_tls_accept = 0;
1124
1125                         /* we need to let SASL know */
1126                         ssl = (void *)ldap_pvt_tls_sb_ctx( c->c_sb );
1127
1128                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1129                         if( c->c_tls_ssf > c->c_ssf ) {
1130                                 c->c_ssf = c->c_tls_ssf;
1131                         }
1132
1133                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
1134                         slap_sasl_external( c, c->c_tls_ssf, authid );
1135                 }
1136                 connection_return( c );
1137                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1138                 return 0;
1139         }
1140 #endif
1141
1142 #ifdef HAVE_CYRUS_SASL
1143         if ( c->c_sasl_layers ) {
1144                 c->c_sasl_layers = 0;
1145
1146                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
1147
1148                 if( rc != LDAP_SUCCESS ) {
1149 #ifdef NEW_LOGGING
1150                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1151                                    "connection_read: conn %d SASL install error %d, closing\n",
1152                                    c->c_connid, rc ));
1153 #else
1154                         Debug( LDAP_DEBUG_TRACE,
1155                                 "connection_read(%d): SASL install error "
1156                                 "error=%d id=%ld, closing\n",
1157                                 s, rc, c->c_connid );
1158 #endif
1159                         /* connections_mutex and c_mutex are locked */
1160                         connection_closing( c );
1161                         connection_close( c );
1162                         connection_return( c );
1163                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1164                         return 0;
1165                 }
1166         }
1167 #endif
1168
1169 #define CONNECTION_INPUT_LOOP 1
1170
1171 #ifdef DATA_READY_LOOP
1172         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
1173 #elif CONNECTION_INPUT_LOOP
1174         while(!rc)
1175 #endif
1176         {
1177                 /* How do we do this without getting into a busy loop ? */
1178                 rc = connection_input( c );
1179         }
1180
1181         if( rc < 0 ) {
1182 #ifdef NEW_LOGGING
1183                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1184                            "connection_read: conn %d  input error %d, closing.\n",
1185                            c->c_connid, rc ));
1186 #else
1187                 Debug( LDAP_DEBUG_TRACE,
1188                         "connection_read(%d): input error=%d id=%ld, closing.\n",
1189                         s, rc, c->c_connid );
1190 #endif
1191                 /* connections_mutex and c_mutex are locked */
1192                 connection_closing( c );
1193                 connection_close( c );
1194                 connection_return( c );
1195                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1196                 return 0;
1197         }
1198
1199         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1200                 slapd_set_read( s, 1 );
1201         }
1202
1203         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1204                 slapd_set_write( s, 1 );
1205         }
1206
1207         connection_return( c );
1208         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1209         return 0;
1210 }
1211
1212 static int
1213 connection_input(
1214     Connection *conn
1215 )
1216 {
1217         Operation *op;
1218         ber_tag_t       tag;
1219         ber_len_t       len;
1220         ber_int_t       msgid;
1221         BerElement      *ber;
1222 #ifdef LDAP_CONNECTIONLESS
1223         Sockaddr        peeraddr;
1224         char            *cdn = NULL;
1225 #endif
1226
1227         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1228             == NULL ) {
1229 #ifdef NEW_LOGGING
1230                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1231                            "connection_input: conn %d  ber_alloc failed.\n", conn->c_connid ));
1232 #else
1233                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1234 #endif
1235                 return -1;
1236         }
1237
1238         errno = 0;
1239
1240 #ifdef LDAP_CONNECTIONLESS
1241         if (conn->c_is_udp)
1242         {
1243                 char    peername[sizeof("IP=255.255.255.255:65336")];
1244                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1245                         sizeof(struct sockaddr));
1246                 if (len != sizeof(struct sockaddr))
1247                         return 1;
1248                 sprintf( peername, "IP=%s:%d",
1249                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1250                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1251                 Statslog( LDAP_DEBUG_STATS,
1252                             "conn=%ld UDP request from %s (%s) accepted.\n",
1253                             conn->c_connid, peername,
1254                             conn->c_sock_name, 0, 0 );
1255         }
1256 #endif
1257         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1258         if ( tag != LDAP_TAG_MESSAGE ) {
1259                 int err = errno;
1260                 ber_socket_t    sd;
1261
1262                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1263
1264 #ifdef NEW_LOGGING
1265                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1266                            "connection_input: conn %d  ber_get_next failed, errno %d (%s).\n",
1267                            conn->c_connid, err, sock_errstr(err) ));
1268 #else
1269                 Debug( LDAP_DEBUG_TRACE,
1270                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1271                         sd, err, sock_errstr(err) );
1272 #endif
1273                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1274                         /* log, close and send error */
1275                         ber_free( conn->c_currentber, 1 );
1276                         conn->c_currentber = NULL;
1277
1278                         return -2;
1279                 }
1280                 return 1;
1281         }
1282
1283         ber = conn->c_currentber;
1284         conn->c_currentber = NULL;
1285
1286         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1287                 /* log, close and send error */
1288 #ifdef NEW_LOGGING
1289                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1290                            "connection_input: conn %d  ber_get_int returns 0x%lx.\n",
1291                            conn->c_connid, tag ));
1292 #else
1293                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1294                     0 );
1295 #endif
1296                 ber_free( ber, 1 );
1297                 return -1;
1298         }
1299
1300         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1301                 /* log, close and send error */
1302 #ifdef NEW_LOGGING
1303                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1304                            "connection_input: conn %d  ber_peek_tag returns 0x%lx.\n",
1305                            conn->c_connid, tag ));
1306 #else
1307                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1308                     0 );
1309 #endif
1310                 ber_free( ber, 1 );
1311
1312                 return -1;
1313         }
1314
1315 #ifdef LDAP_CONNECTIONLESS
1316         if (conn->c_is_udp) {
1317                 if (tag == LBER_OCTETSTRING) {
1318                         ber_get_stringa( ber, &cdn );
1319                         tag = ber_peek_tag(ber, &len);
1320                 }
1321                 if (tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH) {
1322 #ifdef NEW_LOGGING
1323                     LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1324                                "connection_input: conn %d  invalid req for UDP 0x%lx.\n",
1325                                conn->c_connid, tag ));
1326 #else
1327                     Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0,
1328                         0 );
1329 #endif
1330                     ber_free( ber, 1 );
1331                     return 0;
1332                 }
1333         }
1334 #endif
1335         if(tag == LDAP_REQ_BIND) {
1336                 /* immediately abandon all exiting operations upon BIND */
1337                 connection_abandon( conn );
1338         }
1339
1340         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1341
1342 #ifdef LDAP_CONNECTIONLESS
1343         op->o_peeraddr = peeraddr;
1344         if (cdn) {
1345             op->o_dn = cdn;
1346             op->o_protocol = LDAP_VERSION2;
1347         }
1348 #endif
1349         if ( conn->c_conn_state == SLAP_C_BINDING
1350                 || conn->c_conn_state == SLAP_C_CLOSING )
1351         {
1352 #ifdef NEW_LOGGING
1353                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1354                            "connection_input: conn %d  deferring operation\n",
1355                            conn->c_connid ));
1356 #else
1357                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1358 #endif
1359                 conn->c_n_ops_pending++;
1360                 LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
1361
1362         } else {
1363                 conn->c_n_ops_executing++;
1364                 connection_op_activate( conn, op );
1365         }
1366
1367 #ifdef NO_THREADS
1368         if ( conn->c_struct_state != SLAP_C_USED ) {
1369                 /* connection must have got closed underneath us */
1370                 return 1;
1371         }
1372 #endif
1373         assert( conn->c_struct_state == SLAP_C_USED );
1374
1375         return 0;
1376 }
1377
1378 static int
1379 connection_resched( Connection *conn )
1380 {
1381         Operation *op;
1382
1383         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1384                 int rc;
1385                 ber_socket_t    sd;
1386                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1387
1388                 /* us trylock to avoid possible deadlock */
1389                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1390
1391                 if( rc ) {
1392 #ifdef NEW_LOGGING
1393                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1394                                    "connection_resched: conn %d  reaquiring locks.\n",
1395                                    conn->c_connid ));
1396 #else
1397                         Debug( LDAP_DEBUG_TRACE,
1398                                 "connection_resched: reaquiring locks conn=%ld sd=%d\n",
1399                                 conn->c_connid, sd, 0 );
1400 #endif
1401                         /*
1402                          * reaquire locks in the right order...
1403                          * this may allow another thread to close this connection,
1404                          * so recheck state below.
1405                          */
1406                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1407                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1408                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1409                 }
1410
1411                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1412 #ifdef NEW_LOGGING
1413                         LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1414                                    "connection_resched: conn %d  closed by other thread.\n",
1415                                    conn->c_connid ));
1416 #else
1417                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1418                                 "closed by other thread conn=%ld sd=%d\n",
1419                                 conn->c_connid, sd, 0 );
1420 #endif
1421                 } else {
1422 #ifdef NEW_LOGGING
1423                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1424                                    "connection_resched: conn %d  attempting closing.\n",
1425                                    conn->c_connid ));
1426 #else
1427                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1428                                 "attempting closing conn=%ld sd=%d\n",
1429                                 conn->c_connid, sd, 0 );
1430 #endif
1431                         connection_close( conn );
1432                 }
1433
1434                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1435                 return 0;
1436         }
1437
1438         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1439                 /* other states need different handling */
1440                 return 0;
1441         }
1442
1443         while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
1444                 LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
1445                 LDAP_STAILQ_NEXT(op, o_next) = NULL;
1446                 /* pending operations should not be marked for abandonment */
1447                 assert(!op->o_abandon);
1448
1449                 conn->c_n_ops_pending--;
1450                 conn->c_n_ops_executing++;
1451
1452                 connection_op_activate( conn, op );
1453
1454                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1455                         break;
1456                 }
1457         }
1458         return 0;
1459 }
1460
1461 static int connection_op_activate( Connection *conn, Operation *op )
1462 {
1463         struct co_arg *arg;
1464         int status;
1465         ber_tag_t tag = op->o_tag;
1466
1467         if(tag == LDAP_REQ_BIND) {
1468                 conn->c_conn_state = SLAP_C_BINDING;
1469         }
1470
1471         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1472         arg->co_conn = conn;
1473         arg->co_op = op;
1474
1475         if (!arg->co_op->o_dn.bv_len) {
1476             arg->co_op->o_authz = conn->c_authz;
1477             arg->co_op->o_dn.bv_val = ch_strdup( conn->c_dn.bv_val ?
1478                 conn->c_dn.bv_val : "" );
1479             arg->co_op->o_ndn.bv_val = ch_strdup( conn->c_ndn.bv_val ?
1480                 conn->c_ndn.bv_val : "" );
1481         }
1482         arg->co_op->o_authtype = conn->c_authtype;
1483         ber_dupbv( &arg->co_op->o_authmech, &conn->c_authmech );
1484
1485         if (!arg->co_op->o_protocol) {
1486             arg->co_op->o_protocol = conn->c_protocol
1487                 ? conn->c_protocol : LDAP_VERSION3;
1488         }
1489         arg->co_op->o_connid = conn->c_connid;
1490
1491         LDAP_STAILQ_INSERT_TAIL( &conn->c_ops, arg->co_op, o_next );
1492
1493         status = ldap_pvt_thread_pool_submit( &connection_pool,
1494                 connection_operation, (void *) arg );
1495
1496         if ( status != 0 ) {
1497 #ifdef NEW_LOGGING
1498                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1499                            "connection_op_activate: conn %d      thread pool submit failed.\n",
1500                            conn->c_connid ));
1501 #else
1502                 Debug( LDAP_DEBUG_ANY,
1503                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1504 #endif
1505                 /* should move op to pending list */
1506         }
1507
1508         return status;
1509 }
1510
1511 int connection_write(ber_socket_t s)
1512 {
1513         Connection *c;
1514         assert( connections != NULL );
1515
1516         ldap_pvt_thread_mutex_lock( &connections_mutex );
1517
1518         c = connection_get( s );
1519
1520         slapd_clr_write( s, 0);
1521
1522         if( c == NULL ) {
1523 #ifdef NEW_LOGGING
1524                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1525                            "connection_write: sock %ld  no connection!\n",(long)s));
1526 #else
1527                 Debug( LDAP_DEBUG_ANY,
1528                         "connection_write(%ld): no connection!\n",
1529                         (long) s, 0, 0 );
1530 #endif
1531                 slapd_remove(s, 0);
1532                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1533                 return -1;
1534         }
1535
1536         c->c_n_write++;
1537
1538 #ifdef NEW_LOGGING
1539         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1540                    "connection_write conn %d  waking output.\n",
1541                    c->c_connid ));
1542 #else
1543         Debug( LDAP_DEBUG_TRACE,
1544                 "connection_write(%d): waking output for id=%ld\n",
1545                 s, c->c_connid, 0 );
1546 #endif
1547         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1548
1549         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1550                 slapd_set_read( s, 1 );
1551         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1552                 slapd_set_write( s, 1 );
1553         connection_return( c );
1554         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1555         return 0;
1556 }
1557