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 #include <ac/unistd.h>
  18
  19 #include "ldap_pvt.h"
  20 #include "lutil.h"
  21 #include "slap.h"
  22
  23 /* I guess this should be declared in ldap_pvt.h */
  24 extern void * ldap_pvt_tls_sb_ctx( Sockbuf *sb );
  25
  26 /* protected by connections_mutex */
  27 static ldap_pvt_thread_mutex_t connections_mutex;
  28 static Connection *connections = NULL;
  29 static unsigned long conn_nextid = 0;
  30
  31 /* structure state (protected by connections_mutex) */
  32 #define SLAP_C_UNINITIALIZED    0x00    /* MUST BE ZERO (0) */
  33 #define SLAP_C_UNUSED                   0x01
  34 #define SLAP_C_USED                             0x02
  35
  36 /* connection state (protected by c_mutex ) */
  37 #define SLAP_C_INVALID                  0x00    /* MUST BE ZERO (0) */
  38 #define SLAP_C_INACTIVE                 0x01    /* zero threads */
  39 #define SLAP_C_ACTIVE                   0x02    /* one or more threads */
  40 #define SLAP_C_BINDING                  0x03    /* binding */
  41 #define SLAP_C_CLOSING                  0x04    /* closing */
  42
  43 const char *
  44 connection_state2str( int state )
  45 {
  46         switch( state ) {
  47         case SLAP_C_INVALID:    return "!";
  48         case SLAP_C_INACTIVE:   return "|";
  49         case SLAP_C_ACTIVE:             return "";
  50         case SLAP_C_BINDING:    return "B";
  51         case SLAP_C_CLOSING:    return "C";
  52         }
  53
  54         return "?";
  55 }
  56
  57 static Connection* connection_get( ber_socket_t s );
  58
  59 static int connection_input( Connection *c );
  60 static void connection_close( Connection *c );
  61
  62 static int connection_op_activate( Connection *conn, Operation *op );
  63 static int connection_resched( Connection *conn );
  64 static void connection_abandon( Connection *conn );
  65 static void connection_destroy( Connection *c );
  66
  67 struct co_arg {
  68         Connection      *co_conn;
  69         Operation       *co_op;
  70 };
  71
  72 /*
  73  * Initialize connection management infrastructure.
  74  */
  75 int connections_init(void)
  76 {
  77         assert( connections == NULL );
  78
  79         if( connections != NULL) {
  80 #ifdef NEW_LOGGING
  81                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
  82                            "connections_init:  already initialized.\n" ));
  83 #else
  84                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  85                         0, 0, 0 );
  86 #endif
  87                 return -1;
  88         }
  89
  90         /* should check return of every call */
  91         ldap_pvt_thread_mutex_init( &connections_mutex );
  92
  93         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  94
  95         if( connections == NULL ) {
  96 #ifdef NEW_LOGGING
  97                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
  98                            "connections_init: allocation (%d * %ld) of connection array failed\n",
  99                            dtblsize, (long) sizeof(Connection) ));
 100 #else
 101                 Debug( LDAP_DEBUG_ANY,
 102                         "connections_init: allocation (%d*%ld) of connection array failed\n",
 103                         dtblsize, (long) sizeof(Connection), 0 );
 104 #endif
 105                 return -1;
 106         }
 107
 108     assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
 109     assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
 110
 111         /*
 112          * per entry initialization of the Connection array initialization
 113          * will be done by connection_init()
 114          */
 115
 116         return 0;
 117 }
 118
 119 /*
 120  * Destroy connection management infrastructure.
 121  */
 122 int connections_destroy(void)
 123 {
 124         ber_socket_t i;
 125
 126         /* should check return of every call */
 127
 128         if( connections == NULL) {
 129 #ifdef NEW_LOGGING
 130                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 131                            "connections_destroy: nothing to destroy.\n"));
 132 #else
 133                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
 134                         0, 0, 0 );
 135 #endif
 136                 return -1;
 137         }
 138
 139         for ( i = 0; i < dtblsize; i++ ) {
 140                 if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
 141                         ber_sockbuf_free( connections[i].c_sb );
 142                         ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 143                         ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 144                         ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 145                 }
 146         }
 147
 148         free( connections );
 149         connections = NULL;
 150
 151         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 152         return 0;
 153 }
 154
 155 /*
 156  * shutdown all connections
 157  */
 158 int connections_shutdown(void)
 159 {
 160         ber_socket_t i;
 161
 162         ldap_pvt_thread_mutex_lock( &connections_mutex );
 163
 164         for ( i = 0; i < dtblsize; i++ ) {
 165                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 166                         continue;
 167                 }
 168
 169                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 170
 171                 /* connections_mutex and c_mutex are locked */
 172                 connection_closing( &connections[i] );
 173                 connection_close( &connections[i] );
 174
 175                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 176         }
 177
 178         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 179
 180         return 0;
 181 }
 182
 183 /*
 184  * Timeout idle connections.
 185  */
 186 int connections_timeout_idle(time_t now)
 187 {
 188         int i = 0;
 189         int connindex;
 190         Connection* c;
 191
 192         for( c = connection_first( &connindex );
 193                 c != NULL;
 194                 c = connection_next( c, &connindex ) )
 195         {
 196                 if( difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
 197                         /* close it */
 198                         connection_closing( c );
 199                         connection_close( c );
 200                         i++;
 201                 }
 202         }
 203         connection_done( c );
 204
 205         return i;
 206 }
 207
 208 static Connection* connection_get( ber_socket_t s )
 209 {
 210         /* connections_mutex should be locked by caller */
 211
 212         Connection *c;
 213
 214 #ifdef NEW_LOGGING
 215         LDAP_LOG(( "connection", LDAP_LEVEL_ENTRY,
 216                    "connection_get: socket %ld\n", (long)s ));
 217 #else
 218         Debug( LDAP_DEBUG_ARGS,
 219                 "connection_get(%ld)\n",
 220                 (long) s, 0, 0 );
 221 #endif
 222
 223         assert( connections != NULL );
 224
 225         if(s == AC_SOCKET_INVALID) {
 226                 return NULL;
 227         }
 228
 229 #ifndef HAVE_WINSOCK
 230         c = &connections[s];
 231
 232         assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
 233
 234 #else
 235         c = NULL;
 236         {
 237                 ber_socket_t i, sd;
 238
 239                 for(i=0; i<dtblsize; i++) {
 240                         ber_sockbuf_ctrl( connections[i].c_sb,
 241                                 LBER_SB_OPT_GET_FD, &sd );
 242
 243                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 244                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 245                                 assert( connections[i].c_sb == 0 );
 246                                 break;
 247                         }
 248
 249                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 250                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 251                                 assert( sd == AC_SOCKET_INVALID );
 252                                 continue;
 253                         }
 254
 255                         /* state can actually change from used -> unused by resched,
 256                          * so don't assert details here.
 257                          */
 258
 259                         if( sd == s ) {
 260                                 c = &connections[i];
 261                                 break;
 262                         }
 263                 }
 264         }
 265 #endif
 266
 267         if( c != NULL ) {
 268                 ber_socket_t    sd;
 269
 270                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 271
 272                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 273                 if( c->c_struct_state != SLAP_C_USED ) {
 274                         /* connection must have been closed due to resched */
 275
 276                         assert( c->c_conn_state == SLAP_C_INVALID );
 277                         assert( sd == AC_SOCKET_INVALID );
 278
 279 #ifdef NEW_LOGGING
 280                         LDAP_LOG(( "connection", LDAP_LEVEL_ARGS,
 281                                    "connection_get:  connection %d not used\n", s ));
 282 #else
 283                         Debug( LDAP_DEBUG_TRACE,
 284                                 "connection_get(%d): connection not used\n",
 285                                 s, 0, 0 );
 286 #endif
 287
 288                         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 289                         return NULL;
 290                 }
 291
 292 #ifdef NEW_LOGGING
 293                 LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 294                            "connection_get: get for %d got connid %ld\n",s, c->c_connid ));
 295 #else
 296                 Debug( LDAP_DEBUG_TRACE,
 297                         "connection_get(%d): got connid=%ld\n",
 298                         s, c->c_connid, 0 );
 299 #endif
 300
 301                 c->c_n_get++;
 302
 303                 assert( c->c_struct_state == SLAP_C_USED );
 304                 assert( c->c_conn_state != SLAP_C_INVALID );
 305                 assert( sd != AC_SOCKET_INVALID );
 306
 307 #ifdef SLAPD_MONITOR
 308                 c->c_activitytime = slap_get_time();
 309 #else
 310                 if( global_idletimeout > 0 ) {
 311                         c->c_activitytime = slap_get_time();
 312                 }
 313 #endif
 314         }
 315
 316         return c;
 317 }
 318
 319 static void connection_return( Connection *c )
 320 {
 321         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 322 }
 323
 324 long connection_init(
 325         ber_socket_t s,
 326         const char* url,
 327         const char* dnsname,
 328         const char* peername,
 329         const char* sockname,
 330         int tls_udp_option,
 331         slap_ssf_t ssf,
 332         const char *authid )
 333 {
 334         unsigned long id;
 335         Connection *c;
 336
 337         assert( connections != NULL );
 338
 339         assert( dnsname != NULL );
 340         assert( peername != NULL );
 341         assert( sockname != NULL );
 342
 343 #ifndef HAVE_TLS
 344         assert( tls_udp_option != 1 );
 345 #endif
 346
 347         if( s == AC_SOCKET_INVALID ) {
 348 #ifdef NEW_LOGGING
 349                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 350                            "connection_init: init of socket %ld invalid.\n", (long)s ));
 351 #else
 352                 Debug( LDAP_DEBUG_ANY,
 353                        "connection_init(%ld): invalid.\n",
 354                        (long) s, 0, 0 );
 355 #endif
 356                 return -1;
 357         }
 358
 359         assert( s >= 0 );
 360 #ifndef HAVE_WINSOCK
 361         assert( s < dtblsize );
 362 #endif
 363
 364         ldap_pvt_thread_mutex_lock( &connections_mutex );
 365
 366 #ifndef HAVE_WINSOCK
 367         c = &connections[s];
 368
 369 #else
 370         {
 371                 unsigned int i;
 372
 373                 c = NULL;
 374
 375         for( i=0; i < dtblsize; i++) {
 376                 ber_socket_t    sd;
 377
 378             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 379                 assert( connections[i].c_sb == 0 );
 380                 c = &connections[i];
 381                 break;
 382             }
 383
 384                         sd = AC_SOCKET_INVALID;
 385                         if (connections[i].c_sb != NULL)
 386                         ber_sockbuf_ctrl( connections[i].c_sb, LBER_SB_OPT_GET_FD, &sd );
 387
 388             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 389                 assert( sd == AC_SOCKET_INVALID );
 390                 c = &connections[i];
 391                 break;
 392             }
 393
 394             assert( connections[i].c_struct_state == SLAP_C_USED );
 395             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 396             assert( sd != AC_SOCKET_INVALID );
 397         }
 398
 399         if( c == NULL ) {
 400 #ifdef NEW_LOGGING
 401                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 402                            "connection_init: skt %d      connection table full (%d/%d)\n",
 403                            s, i, dtblsize ));
 404 #else
 405                 Debug( LDAP_DEBUG_ANY,
 406                                 "connection_init(%d): connection table full (%d/%d)\n",
 407                                 s, i, dtblsize);
 408 #endif
 409             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 410             return -1;
 411         }
 412     }
 413 #endif
 414
 415     assert( c != NULL );
 416
 417         if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 418                 c->c_authmech = NULL;
 419                 c->c_dn = NULL;
 420                 c->c_cdn = NULL;
 421                 c->c_groups = NULL;
 422
 423                 c->c_listener_url = NULL;
 424                 c->c_peer_domain = NULL;
 425                 c->c_peer_name = NULL;
 426                 c->c_sock_name = NULL;
 427
 428                 c->c_ops = NULL;
 429                 c->c_pending_ops = NULL;
 430
 431                 c->c_sasl_bind_mech = NULL;
 432                 c->c_sasl_context = NULL;
 433                 c->c_sasl_extra = NULL;
 434
 435                 c->c_sb = ber_sockbuf_alloc( );
 436
 437                 {
 438                         ber_len_t max = sockbuf_max_incoming;
 439                         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 440                 }
 441
 442                 c->c_currentber = NULL;
 443
 444                 /* should check status of thread calls */
 445                 ldap_pvt_thread_mutex_init( &c->c_mutex );
 446                 ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 447                 ldap_pvt_thread_cond_init( &c->c_write_cv );
 448
 449                 c->c_struct_state = SLAP_C_UNUSED;
 450         }
 451
 452     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 453
 454     assert( c->c_struct_state == SLAP_C_UNUSED );
 455         assert( c->c_authmech == NULL );
 456     assert(     c->c_dn == NULL );
 457     assert(     c->c_cdn == NULL );
 458     assert( c->c_groups == NULL );
 459     assert( c->c_listener_url == NULL );
 460     assert( c->c_peer_domain == NULL );
 461     assert( c->c_peer_name == NULL );
 462     assert( c->c_sock_name == NULL );
 463     assert( c->c_ops == NULL );
 464     assert( c->c_pending_ops == NULL );
 465         assert( c->c_sasl_bind_mech == NULL );
 466         assert( c->c_sasl_context == NULL );
 467         assert( c->c_sasl_extra == NULL );
 468         assert( c->c_currentber == NULL );
 469
 470         c->c_listener_url = ch_strdup( url  );
 471         c->c_peer_domain = ch_strdup( dnsname  );
 472     c->c_peer_name = ch_strdup( peername  );
 473     c->c_sock_name = ch_strdup( sockname );
 474
 475     c->c_n_ops_received = 0;
 476     c->c_n_ops_executing = 0;
 477     c->c_n_ops_pending = 0;
 478     c->c_n_ops_completed = 0;
 479
 480         c->c_n_get = 0;
 481         c->c_n_read = 0;
 482         c->c_n_write = 0;
 483
 484         /* set to zero until bind, implies LDAP_VERSION3 */
 485         c->c_protocol = 0;
 486
 487 #ifdef SLAPD_MONITOR
 488         c->c_activitytime = c->c_starttime = slap_get_time();
 489 #else
 490         if( global_idletimeout > 0 ) {
 491                 c->c_activitytime = c->c_starttime = slap_get_time();
 492         }
 493 #endif
 494
 495 #ifdef LDAP_CONNECTIONLESS
 496         c->c_is_udp = 0;
 497         if (tls_udp_option == 2)
 498         {
 499                 c->c_is_udp = 1;
 500 #ifdef LDAP_DEBUG
 501         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 502                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
 503 #endif
 504         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
 505                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 506         } else
 507 #endif
 508         {
 509 #ifdef LDAP_DEBUG
 510         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 511                 LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
 512 #endif
 513         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
 514                 LBER_SBIOD_LEVEL_PROVIDER, (void *)&s );
 515         }
 516         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
 517                 LBER_SBIOD_LEVEL_PROVIDER, NULL );
 518
 519 #ifdef LDAP_DEBUG
 520         ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
 521                 INT_MAX, (void*)"ldap_" );
 522 #endif
 523
 524         if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
 525                 c /* non-NULL */ ) < 0 )
 526         {
 527 #ifdef NEW_LOGGING
 528                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 529                            "connection_init: conn %d  set nonblocking failed\n",
 530                            c->c_connid ));
 531 #else
 532                 Debug( LDAP_DEBUG_ANY,
 533                         "connection_init(%d, %s): set nonblocking failed\n",
 534                         s, c->c_peer_name, 0 );
 535 #endif
 536         }
 537
 538     id = c->c_connid = conn_nextid++;
 539
 540     c->c_conn_state = SLAP_C_INACTIVE;
 541     c->c_struct_state = SLAP_C_USED;
 542
 543         c->c_ssf = c->c_transport_ssf = ssf;
 544         c->c_tls_ssf = 0;
 545
 546 #ifdef HAVE_TLS
 547     if ( tls_udp_option == 1 ) {
 548             c->c_is_tls = 1;
 549             c->c_needs_tls_accept = 1;
 550     } else {
 551             c->c_is_tls = 0;
 552             c->c_needs_tls_accept = 0;
 553     }
 554 #endif
 555
 556         slap_sasl_open( c );
 557         slap_sasl_external( c, ssf, authid );
 558
 559     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 560     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 561
 562     backend_connection_init(c);
 563
 564     return id;
 565 }
 566
 567 void connection2anonymous( Connection *c )
 568 {
 569     assert( connections != NULL );
 570     assert( c != NULL );
 571
 572         {
 573                 ber_len_t max = sockbuf_max_incoming;
 574                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 575         }
 576
 577         if(c->c_authmech != NULL ) {
 578                 free(c->c_authmech);
 579                 c->c_authmech = NULL;
 580         }
 581
 582     if(c->c_dn != NULL) {
 583         free(c->c_dn);
 584         c->c_dn = NULL;
 585     }
 586
 587         if(c->c_cdn != NULL) {
 588                 free(c->c_cdn);
 589                 c->c_cdn = NULL;
 590         }
 591
 592         c->c_authc_backend = NULL;
 593         c->c_authz_backend = NULL;
 594
 595     {
 596         GroupAssertion *g, *n;
 597         for (g = c->c_groups; g; g=n)
 598         {
 599             n = g->next;
 600             free(g);
 601         }
 602         c->c_groups = NULL;
 603     }
 604
 605 }
 606
 607 static void
 608 connection_destroy( Connection *c )
 609 {
 610         /* note: connections_mutex should be locked by caller */
 611     ber_socket_t        sd;
 612
 613     assert( connections != NULL );
 614     assert( c != NULL );
 615     assert( c->c_struct_state != SLAP_C_UNUSED );
 616     assert( c->c_conn_state != SLAP_C_INVALID );
 617     assert( c->c_ops == NULL );
 618
 619     backend_connection_destroy(c);
 620
 621     c->c_protocol = 0;
 622     c->c_connid = -1;
 623
 624     c->c_activitytime = c->c_starttime = 0;
 625
 626         connection2anonymous( c );
 627
 628         if(c->c_listener_url != NULL) {
 629                 free(c->c_listener_url);
 630                 c->c_listener_url = NULL;
 631         }
 632
 633         if(c->c_peer_domain != NULL) {
 634                 free(c->c_peer_domain);
 635                 c->c_peer_domain = NULL;
 636         }
 637         if(c->c_peer_name != NULL) {
 638 #ifdef LDAP_PF_lOCAL
 639                 /*
 640                  * If peer was a domain socket, unlink. Mind you,
 641                  * they may be un-named. Should we leave this to
 642                  * the client?
 643                  */
 644                 if (strncmp(c->c_peer_name, "PATH=", 5) == 0) {
 645                         char *path = c->c_peer_name + 5;
 646                         if (path != '\0') {
 647                                 (void)unlink(path);
 648                         }
 649                 }
 650 #endif /* LDAP_PF_LOCAL */
 651
 652                 free(c->c_peer_name);
 653                 c->c_peer_name = NULL;
 654         }
 655         if(c->c_sock_name != NULL) {
 656                 free(c->c_sock_name);
 657                 c->c_sock_name = NULL;
 658         }
 659
 660         c->c_sasl_bind_in_progress = 0;
 661         if(c->c_sasl_bind_mech != NULL) {
 662                 free(c->c_sasl_bind_mech);
 663                 c->c_sasl_bind_mech = NULL;
 664         }
 665
 666         slap_sasl_close( c );
 667
 668         if ( c->c_currentber != NULL ) {
 669                 ber_free( c->c_currentber, 1 );
 670                 c->c_currentber = NULL;
 671         }
 672
 673         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 674         if ( sd != AC_SOCKET_INVALID ) {
 675                 slapd_remove( sd, 0 );
 676
 677                 Statslog( LDAP_DEBUG_STATS,
 678                     "conn=%ld fd=%d closed\n",
 679                         c->c_connid, sd, 0, 0, 0 );
 680         }
 681
 682         ber_sockbuf_free( c->c_sb );
 683
 684         c->c_sb = ber_sockbuf_alloc( );
 685
 686         {
 687                 ber_len_t max = sockbuf_max_incoming;
 688                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 689         }
 690
 691     c->c_conn_state = SLAP_C_INVALID;
 692     c->c_struct_state = SLAP_C_UNUSED;
 693 }
 694
 695 int connection_state_closing( Connection *c )
 696 {
 697         /* c_mutex must be locked by caller */
 698
 699         int state;
 700         assert( c != NULL );
 701         assert( c->c_struct_state == SLAP_C_USED );
 702
 703         state = c->c_conn_state;
 704
 705         assert( state != SLAP_C_INVALID );
 706
 707         return state == SLAP_C_CLOSING;
 708 }
 709
 710 static void connection_abandon( Connection *c )
 711 {
 712         /* c_mutex must be locked by caller */
 713
 714         Operation *o;
 715
 716         for( o = c->c_ops; o != NULL; o = o->o_next ) {
 717                 ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 718                 o->o_abandon = 1;
 719                 ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 720         }
 721
 722         /* remove pending operations */
 723         for( o = slap_op_pop( &c->c_pending_ops );
 724                 o != NULL;
 725                 o = slap_op_pop( &c->c_pending_ops ) )
 726         {
 727                 slap_op_free( o );
 728         }
 729 }
 730
 731 void connection_closing( Connection *c )
 732 {
 733         assert( connections != NULL );
 734         assert( c != NULL );
 735         assert( c->c_struct_state == SLAP_C_USED );
 736         assert( c->c_conn_state != SLAP_C_INVALID );
 737
 738         /* c_mutex must be locked by caller */
 739
 740         if( c->c_conn_state != SLAP_C_CLOSING ) {
 741                 ber_socket_t    sd;
 742
 743                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 744 #ifdef NEW_LOGGING
 745                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 746                            "connection_closing: conn %d readying socket %d for close.\n",
 747                            c->c_connid, sd ));
 748 #else
 749                 Debug( LDAP_DEBUG_TRACE,
 750                         "connection_closing: readying conn=%ld sd=%d for close\n",
 751                         c->c_connid, sd, 0 );
 752 #endif
 753                 /* update state to closing */
 754                 c->c_conn_state = SLAP_C_CLOSING;
 755
 756                 /* don't listen on this port anymore */
 757                 slapd_clr_read( sd, 1 );
 758
 759                 /* abandon active operations */
 760                 connection_abandon( c );
 761
 762                 /* wake write blocked operations */
 763                 slapd_clr_write( sd, 1 );
 764                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 765         }
 766 }
 767
 768 static void connection_close( Connection *c )
 769 {
 770         ber_socket_t    sd;
 771
 772         assert( connections != NULL );
 773         assert( c != NULL );
 774         assert( c->c_struct_state == SLAP_C_USED );
 775         assert( c->c_conn_state == SLAP_C_CLOSING );
 776
 777         /* note: connections_mutex and c_mutex should be locked by caller */
 778
 779         ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_GET_FD, &sd );
 780         if( c->c_ops != NULL ) {
 781 #ifdef NEW_LOGGING
 782                 LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
 783                            "connection_close: conn %d  deferring sd %d\n",
 784                            c->c_connid, sd ));
 785 #else
 786                 Debug( LDAP_DEBUG_TRACE,
 787                         "connection_close: deferring conn=%ld sd=%d\n",
 788                         c->c_connid, sd, 0 );
 789 #endif
 790                 return;
 791         }
 792
 793 #ifdef NEW_LOGGING
 794         LDAP_LOG(( "connection", LDAP_LEVEL_RESULTS,
 795                    "connection_close: conn %d  sd %d\n",
 796                    c->c_connid, sd ));
 797 #else
 798         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d\n",
 799                 c->c_connid, sd, 0 );
 800 #endif
 801         connection_destroy( c );
 802 }
 803
 804 unsigned long connections_nextid(void)
 805 {
 806         unsigned long id;
 807         assert( connections != NULL );
 808
 809         ldap_pvt_thread_mutex_lock( &connections_mutex );
 810
 811         id = conn_nextid;
 812
 813         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 814
 815         return id;
 816 }
 817
 818 Connection* connection_first( ber_socket_t *index )
 819 {
 820         assert( connections != NULL );
 821         assert( index != NULL );
 822
 823         ldap_pvt_thread_mutex_lock( &connections_mutex );
 824
 825         *index = 0;
 826
 827         return connection_next(NULL, index);
 828 }
 829
 830 Connection* connection_next( Connection *c, ber_socket_t *index )
 831 {
 832         assert( connections != NULL );
 833         assert( index != NULL );
 834         assert( *index <= dtblsize );
 835
 836         if( c != NULL ) {
 837                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 838         }
 839
 840         c = NULL;
 841
 842         for(; *index < dtblsize; (*index)++) {
 843                 if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 844                         assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 845 #ifndef HAVE_WINSOCK
 846                         continue;
 847 #else
 848                         break;
 849 #endif
 850                 }
 851
 852                 if( connections[*index].c_struct_state == SLAP_C_USED ) {
 853                         assert( connections[*index].c_conn_state != SLAP_C_INVALID );
 854                         c = &connections[(*index)++];
 855                         break;
 856                 }
 857
 858                 assert( connections[*index].c_struct_state == SLAP_C_UNUSED );
 859                 assert( connections[*index].c_conn_state == SLAP_C_INVALID );
 860         }
 861
 862         if( c != NULL ) {
 863                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 864         }
 865
 866         return c;
 867 }
 868
 869 void connection_done( Connection *c )
 870 {
 871         assert( connections != NULL );
 872
 873         if( c != NULL ) {
 874                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 875         }
 876
 877         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 878 }
 879
 880 /*
 881  * connection_activity - handle the request operation op on connection
 882  * conn.  This routine figures out what kind of operation it is and
 883  * calls the appropriate stub to handle it.
 884  */
 885
 886 static void *
 887 connection_operation( void *arg_v )
 888 {
 889         int rc;
 890         struct co_arg   *arg = arg_v;
 891         ber_tag_t tag = arg->co_op->o_tag;
 892         Connection *conn = arg->co_conn;
 893
 894         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 895         num_ops_initiated++;
 896         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 897
 898         if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
 899 #ifdef NEW_LOGGING
 900                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
 901                            "connection_operation: conn %d  SASL bind in progress (tag=%ld).\n",
 902                            conn->c_connid, (long)tag ));
 903 #else
 904                 Debug( LDAP_DEBUG_ANY, "connection_operation: "
 905                         "error: SASL bind in progress (tag=%ld).\n",
 906                         (long) tag, 0, 0 );
 907 #endif
 908                 send_ldap_result( conn, arg->co_op,
 909                         rc = LDAP_OPERATIONS_ERROR,
 910                         NULL, "SASL bind in progress", NULL, NULL );
 911                 goto operations_error;
 912         }
 913
 914         switch ( tag ) {
 915         case LDAP_REQ_BIND:
 916                 rc = do_bind( conn, arg->co_op );
 917                 break;
 918
 919         case LDAP_REQ_UNBIND:
 920                 rc = do_unbind( conn, arg->co_op );
 921                 break;
 922
 923         case LDAP_REQ_ADD:
 924                 rc = do_add( conn, arg->co_op );
 925                 break;
 926
 927         case LDAP_REQ_DELETE:
 928                 rc = do_delete( conn, arg->co_op );
 929                 break;
 930
 931         case LDAP_REQ_MODRDN:
 932                 rc = do_modrdn( conn, arg->co_op );
 933                 break;
 934
 935         case LDAP_REQ_MODIFY:
 936                 rc = do_modify( conn, arg->co_op );
 937                 break;
 938
 939         case LDAP_REQ_COMPARE:
 940                 rc = do_compare( conn, arg->co_op );
 941                 break;
 942
 943         case LDAP_REQ_SEARCH:
 944                 rc = do_search( conn, arg->co_op );
 945                 break;
 946
 947         case LDAP_REQ_ABANDON:
 948                 rc = do_abandon( conn, arg->co_op );
 949                 break;
 950
 951         case LDAP_REQ_EXTENDED:
 952                 rc = do_extended( conn, arg->co_op );
 953                 break;
 954
 955         default:
 956 #ifdef NEW_LOGGING
 957                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
 958                            "connection_operation: conn %d  unknown LDAP request 0x%lx\n",
 959                            conn->c_connid, tag ));
 960 #else
 961                 Debug( LDAP_DEBUG_ANY, "unknown LDAP request 0x%lx\n",
 962                     tag, 0, 0 );
 963 #endif
 964                 arg->co_op->o_tag = LBER_ERROR;
 965                 send_ldap_disconnect( conn, arg->co_op,
 966                         LDAP_PROTOCOL_ERROR, "unknown LDAP request" );
 967                 rc = -1;
 968                 break;
 969         }
 970
 971         if( rc == SLAPD_DISCONNECT ) tag = LBER_ERROR;
 972
 973 operations_error:
 974         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 975         num_ops_completed++;
 976         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 977
 978         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 979
 980         conn->c_n_ops_executing--;
 981         conn->c_n_ops_completed++;
 982
 983         slap_op_remove( &conn->c_ops, arg->co_op );
 984         slap_op_free( arg->co_op );
 985         arg->co_op = NULL;
 986         arg->co_conn = NULL;
 987         free( (char *) arg );
 988         arg = NULL;
 989
 990         switch( tag ) {
 991         case LBER_ERROR:
 992         case LDAP_REQ_UNBIND:
 993                 /* c_mutex is locked */
 994                 connection_closing( conn );
 995                 break;
 996
 997         case LDAP_REQ_BIND:
 998                 conn->c_sasl_bind_in_progress =
 999                         rc == LDAP_SASL_BIND_IN_PROGRESS ? 1 : 0;
1000
1001                 if( conn->c_conn_state == SLAP_C_BINDING) {
1002                         conn->c_conn_state = SLAP_C_ACTIVE;
1003                 }
1004         }
1005
1006         connection_resched( conn );
1007
1008         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1009
1010         return NULL;
1011 }
1012
1013 int connection_read(ber_socket_t s)
1014 {
1015         int rc = 0;
1016         Connection *c;
1017         assert( connections != NULL );
1018
1019         ldap_pvt_thread_mutex_lock( &connections_mutex );
1020
1021         /* get (locked) connection */
1022         c = connection_get( s );
1023
1024         if( c == NULL ) {
1025 #ifdef NEW_LOGGING
1026                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1027                            "connection_read: sock %ld no connection\n",
1028                            (long)s ));
1029 #else
1030                 Debug( LDAP_DEBUG_ANY,
1031                         "connection_read(%ld): no connection!\n",
1032                         (long) s, 0, 0 );
1033 #endif
1034                 slapd_remove(s, 0);
1035
1036                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1037                 return -1;
1038         }
1039
1040         c->c_n_read++;
1041
1042         if( c->c_conn_state == SLAP_C_CLOSING ) {
1043 #ifdef NEW_LOGGING
1044                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1045                            "connection_read: conn %d connection closing, ignoring input\n",
1046                            c->c_connid));
1047 #else
1048                 Debug( LDAP_DEBUG_TRACE,
1049                         "connection_read(%d): closing, ignoring input for id=%ld\n",
1050                         s, c->c_connid, 0 );
1051 #endif
1052                 connection_return( c );
1053                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1054                 return 0;
1055         }
1056
1057 #ifdef NEW_LOGGING
1058         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1059                    "connection_read: conn %d  checking for input.\n", c->c_connid ));
1060 #else
1061         Debug( LDAP_DEBUG_TRACE,
1062                 "connection_read(%d): checking for input on id=%ld\n",
1063                 s, c->c_connid, 0 );
1064 #endif
1065
1066 #ifdef HAVE_TLS
1067         if ( c->c_is_tls && c->c_needs_tls_accept ) {
1068                 rc = ldap_pvt_tls_accept( c->c_sb, NULL );
1069                 if ( rc < 0 ) {
1070 #if 0 /* required by next #if 0 */
1071                         struct timeval tv;
1072                         fd_set rfd;
1073 #endif
1074
1075 #ifdef NEW_LOGGING
1076                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1077                                    "connection_read: conn %d  TLS accept error, error %d\n",
1078                                    c->c_connid, rc ));
1079 #else
1080                         Debug( LDAP_DEBUG_TRACE,
1081                                 "connection_read(%d): TLS accept error "
1082                                 "error=%d id=%ld, closing\n",
1083                                 s, rc, c->c_connid );
1084 #endif
1085                         c->c_needs_tls_accept = 0;
1086                         /* connections_mutex and c_mutex are locked */
1087                         connection_closing( c );
1088
1089 #if 0
1090                         /* Drain input before close, to allow SSL error codes
1091                          * to propagate to client. */
1092                         FD_ZERO(&rfd);
1093                         FD_SET(s, &rfd);
1094                         for (rc=1; rc>0;)
1095                         {
1096                             tv.tv_sec = 1;
1097                             tv.tv_usec = 0;
1098                             rc = select(s+1, &rfd, NULL, NULL, &tv);
1099                             if (rc == 1)
1100                                 ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DRAIN,
1101                                     NULL);
1102                         }
1103 #endif
1104                         connection_close( c );
1105
1106                 } else if ( rc == 0 ) {
1107                         void *ssl;
1108                         char *authid;
1109
1110                         c->c_needs_tls_accept = 0;
1111
1112                         /* we need to let SASL know */
1113                         ssl = (void *)ldap_pvt_tls_sb_ctx( c->c_sb );
1114
1115                         c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
1116                         if( c->c_tls_ssf > c->c_ssf ) {
1117                                 c->c_ssf = c->c_tls_ssf;
1118                         }
1119
1120                         authid = (char *)ldap_pvt_tls_get_peer( ssl );
1121                         slap_sasl_external( c, c->c_tls_ssf, authid );
1122                 }
1123                 connection_return( c );
1124                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1125                 return 0;
1126         }
1127 #endif
1128
1129 #ifdef HAVE_CYRUS_SASL
1130         if ( c->c_sasl_layers ) {
1131                 c->c_sasl_layers = 0;
1132
1133                 rc = ldap_pvt_sasl_install( c->c_sb,  c->c_sasl_context );
1134
1135                 if( rc != LDAP_SUCCESS ) {
1136 #ifdef NEW_LOGGING
1137                         LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1138                                    "connection_read: conn %d SASL install error %d, closing\n",
1139                                    c->c_connid, rc ));
1140 #else
1141                         Debug( LDAP_DEBUG_TRACE,
1142                                 "connection_read(%d): SASL install error "
1143                                 "error=%d id=%ld, closing\n",
1144                                 s, rc, c->c_connid );
1145 #endif
1146                         /* connections_mutex and c_mutex are locked */
1147                         connection_closing( c );
1148                         connection_close( c );
1149                         connection_return( c );
1150                         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1151                         return 0;
1152                 }
1153         }
1154 #endif
1155
1156 #define CONNECTION_INPUT_LOOP 1
1157
1158 #ifdef DATA_READY_LOOP
1159         while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_DATA_READY, NULL ) )
1160 #elif CONNECTION_INPUT_LOOP
1161         while(!rc)
1162 #endif
1163         {
1164                 /* How do we do this without getting into a busy loop ? */
1165                 rc = connection_input( c );
1166         }
1167
1168         if( rc < 0 ) {
1169 #ifdef NEW_LOGGING
1170                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1171                            "connection_read: conn %d  input error %d, closing.\n",
1172                            c->c_connid, rc ));
1173 #else
1174                 Debug( LDAP_DEBUG_TRACE,
1175                         "connection_read(%d): input error=%d id=%ld, closing.\n",
1176                         s, rc, c->c_connid );
1177 #endif
1178                 /* connections_mutex and c_mutex are locked */
1179                 connection_closing( c );
1180                 connection_close( c );
1181                 connection_return( c );
1182                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1183                 return 0;
1184         }
1185
1186         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
1187                 slapd_set_read( s, 1 );
1188         }
1189
1190         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
1191                 slapd_set_write( s, 1 );
1192         }
1193
1194         connection_return( c );
1195         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1196         return 0;
1197 }
1198
1199 static int
1200 connection_input(
1201     Connection *conn
1202 )
1203 {
1204         Operation *op;
1205         ber_tag_t       tag;
1206         ber_len_t       len;
1207         ber_int_t       msgid;
1208         BerElement      *ber;
1209 #ifdef LDAP_CONNECTIONLESS
1210         Sockaddr        peeraddr;
1211         char            *cdn = NULL;
1212 #endif
1213
1214         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
1215             == NULL ) {
1216 #ifdef NEW_LOGGING
1217                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1218                            "connection_input: conn %d  ber_alloc failed.\n", conn->c_connid ));
1219 #else
1220                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
1221 #endif
1222                 return -1;
1223         }
1224
1225         errno = 0;
1226
1227 #ifdef LDAP_CONNECTIONLESS
1228         if (conn->c_is_udp)
1229         {
1230                 char    peername[sizeof("IP=255.255.255.255:65336")];
1231                 len = ber_int_sb_read(conn->c_sb, &peeraddr,
1232                         sizeof(struct sockaddr));
1233                 if (len != sizeof(struct sockaddr))
1234                         return 1;
1235                 sprintf( peername, "IP=%s:%d",
1236                         inet_ntoa( peeraddr.sa_in_addr.sin_addr ),
1237                         (unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
1238                 Statslog( LDAP_DEBUG_STATS,
1239                             "conn=%ld UDP request from %s (%s) accepted.\n",
1240                             conn->c_connid, peername,
1241                             conn->c_sock_name, 0, 0 );
1242         }
1243 #endif
1244         tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
1245         if ( tag != LDAP_TAG_MESSAGE ) {
1246                 int err = errno;
1247                 ber_socket_t    sd;
1248
1249                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1250
1251 #ifdef NEW_LOGGING
1252                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1253                            "connection_input: conn %d  ber_get_next failed, errno %d (%s).\n",
1254                            conn->c_connid, err, sock_errstr(err) ));
1255 #else
1256                 Debug( LDAP_DEBUG_TRACE,
1257                         "ber_get_next on fd %d failed errno=%d (%s)\n",
1258                         sd, err, sock_errstr(err) );
1259 #endif
1260                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
1261                         /* log, close and send error */
1262                         ber_free( conn->c_currentber, 1 );
1263                         conn->c_currentber = NULL;
1264
1265                         return -2;
1266                 }
1267                 return 1;
1268         }
1269
1270         ber = conn->c_currentber;
1271         conn->c_currentber = NULL;
1272
1273         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
1274                 /* log, close and send error */
1275 #ifdef NEW_LOGGING
1276                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1277                            "connection_input: conn %d  ber_get_int returns 0x%lx.\n",
1278                            conn->c_connid, tag ));
1279 #else
1280                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
1281                     0 );
1282 #endif
1283                 ber_free( ber, 1 );
1284                 return -1;
1285         }
1286
1287         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
1288                 /* log, close and send error */
1289 #ifdef NEW_LOGGING
1290                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1291                            "connection_input: conn %d  ber_peek_tag returns 0x%lx.\n",
1292                            conn->c_connid, tag ));
1293 #else
1294                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
1295                     0 );
1296 #endif
1297                 ber_free( ber, 1 );
1298
1299                 return -1;
1300         }
1301
1302 #ifdef LDAP_CONNECTIONLESS
1303         if (conn->c_is_udp) {
1304                 if (tag == LBER_OCTETSTRING) {
1305                         ber_get_stringa( ber, &cdn );
1306                         tag = ber_peek_tag(ber, &len);
1307                 }
1308                 if (tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH) {
1309 #ifdef NEW_LOGGING
1310                     LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1311                                "connection_input: conn %d  invalid req for UDP 0x%lx.\n",
1312                                conn->c_connid, tag ));
1313 #else
1314                     Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0,
1315                         0 );
1316 #endif
1317                     ber_free( ber, 1 );
1318                     return 0;
1319                 }
1320         }
1321 #endif
1322         if(tag == LDAP_REQ_BIND) {
1323                 /* immediately abandon all exiting operations upon BIND */
1324                 connection_abandon( conn );
1325         }
1326
1327         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
1328
1329 #ifdef LDAP_CONNECTIONLESS
1330         op->o_peeraddr = peeraddr;
1331         if (cdn) {
1332             op->o_dn = cdn;
1333             op->o_protocol = LDAP_VERSION2;
1334         }
1335 #endif
1336         if ( conn->c_conn_state == SLAP_C_BINDING
1337                 || conn->c_conn_state == SLAP_C_CLOSING )
1338         {
1339 #ifdef NEW_LOGGING
1340                 LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1341                            "connection_input: conn %d  deferring operation\n",
1342                            conn->c_connid ));
1343 #else
1344                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
1345 #endif
1346                 conn->c_n_ops_pending++;
1347                 slap_op_add( &conn->c_pending_ops, op );
1348
1349         } else {
1350                 conn->c_n_ops_executing++;
1351                 connection_op_activate( conn, op );
1352         }
1353
1354 #ifdef NO_THREADS
1355         if ( conn->c_struct_state != SLAP_C_USED ) {
1356                 /* connection must have got closed underneath us */
1357                 return 1;
1358         }
1359 #endif
1360         assert( conn->c_struct_state == SLAP_C_USED );
1361
1362         return 0;
1363 }
1364
1365 static int
1366 connection_resched( Connection *conn )
1367 {
1368         Operation *op;
1369
1370         if( conn->c_conn_state == SLAP_C_CLOSING ) {
1371                 int rc;
1372                 ber_socket_t    sd;
1373                 ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_GET_FD, &sd );
1374
1375                 /* us trylock to avoid possible deadlock */
1376                 rc = ldap_pvt_thread_mutex_trylock( &connections_mutex );
1377
1378                 if( rc ) {
1379 #ifdef NEW_LOGGING
1380                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1381                                    "connection_resched: conn %d  reaquiring locks.\n",
1382                                    conn->c_connid ));
1383 #else
1384                         Debug( LDAP_DEBUG_TRACE,
1385                                 "connection_resched: reaquiring locks conn=%ld sd=%d\n",
1386                                 conn->c_connid, sd, 0 );
1387 #endif
1388                         /*
1389                          * reaquire locks in the right order...
1390                          * this may allow another thread to close this connection,
1391                          * so recheck state below.
1392                          */
1393                         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
1394                         ldap_pvt_thread_mutex_lock( &connections_mutex );
1395                         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
1396                 }
1397
1398                 if( conn->c_conn_state != SLAP_C_CLOSING ) {
1399 #ifdef NEW_LOGGING
1400                         LDAP_LOG(( "connection", LDAP_LEVEL_INFO,
1401                                    "connection_resched: conn %d  closed by other thread.\n",
1402                                    conn->c_connid ));
1403 #else
1404                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1405                                 "closed by other thread conn=%ld sd=%d\n",
1406                                 conn->c_connid, sd, 0 );
1407 #endif
1408                 } else {
1409 #ifdef NEW_LOGGING
1410                         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1411                                    "connection_resched: conn %d  attempting closing.\n",
1412                                    conn->c_connid ));
1413 #else
1414                         Debug( LDAP_DEBUG_TRACE, "connection_resched: "
1415                                 "attempting closing conn=%ld sd=%d\n",
1416                                 conn->c_connid, sd, 0 );
1417 #endif
1418                         connection_close( conn );
1419                 }
1420
1421                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1422                 return 0;
1423         }
1424
1425         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
1426                 /* other states need different handling */
1427                 return 0;
1428         }
1429
1430         for( op = slap_op_pop( &conn->c_pending_ops );
1431                 op != NULL;
1432                 op = slap_op_pop( &conn->c_pending_ops ) )
1433         {
1434                 /* pending operations should not be marked for abandonment */
1435                 assert(!op->o_abandon);
1436
1437                 conn->c_n_ops_pending--;
1438                 conn->c_n_ops_executing++;
1439
1440                 connection_op_activate( conn, op );
1441
1442                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
1443                         break;
1444                 }
1445         }
1446         return 0;
1447 }
1448
1449 static int connection_op_activate( Connection *conn, Operation *op )
1450 {
1451         struct co_arg *arg;
1452         int status;
1453         ber_tag_t tag = op->o_tag;
1454
1455         if(tag == LDAP_REQ_BIND) {
1456                 conn->c_conn_state = SLAP_C_BINDING;
1457         }
1458
1459         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
1460         arg->co_conn = conn;
1461         arg->co_op = op;
1462
1463         if (!arg->co_op->o_dn) {
1464             arg->co_op->o_authz = conn->c_authz;
1465             arg->co_op->o_dn = ch_strdup( conn->c_dn != NULL ? conn->c_dn : "" );
1466         }
1467         arg->co_op->o_ndn = ch_strdup( arg->co_op->o_dn );
1468         (void) dn_normalize( arg->co_op->o_ndn );
1469         arg->co_op->o_authtype = conn->c_authtype;
1470         arg->co_op->o_authmech = conn->c_authmech != NULL
1471                 ?  ch_strdup( conn->c_authmech ) : NULL;
1472
1473         if (!arg->co_op->o_protocol) {
1474             arg->co_op->o_protocol = conn->c_protocol
1475                 ? conn->c_protocol : LDAP_VERSION3;
1476         }
1477         arg->co_op->o_connid = conn->c_connid;
1478
1479         slap_op_add( &conn->c_ops, arg->co_op );
1480
1481         status = ldap_pvt_thread_pool_submit( &connection_pool,
1482                 connection_operation, (void *) arg );
1483
1484         if ( status != 0 ) {
1485 #ifdef NEW_LOGGING
1486                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1487                            "connection_op_activate: conn %d      thread pool submit failed.\n",
1488                            conn->c_connid ));
1489 #else
1490                 Debug( LDAP_DEBUG_ANY,
1491                 "ldap_pvt_thread_pool_submit failed (%d)\n", status, 0, 0 );
1492 #endif
1493                 /* should move op to pending list */
1494         }
1495
1496         return status;
1497 }
1498
1499 int connection_write(ber_socket_t s)
1500 {
1501         Connection *c;
1502         assert( connections != NULL );
1503
1504         ldap_pvt_thread_mutex_lock( &connections_mutex );
1505
1506         c = connection_get( s );
1507
1508         slapd_clr_write( s, 0);
1509
1510         if( c == NULL ) {
1511 #ifdef NEW_LOGGING
1512                 LDAP_LOG(( "connection", LDAP_LEVEL_ERR,
1513                            "connection_write: sock %ld  no connection!\n",(long)s));
1514 #else
1515                 Debug( LDAP_DEBUG_ANY,
1516                         "connection_write(%ld): no connection!\n",
1517                         (long) s, 0, 0 );
1518 #endif
1519                 slapd_remove(s, 0);
1520                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
1521                 return -1;
1522         }
1523
1524         c->c_n_write++;
1525
1526 #ifdef NEW_LOGGING
1527         LDAP_LOG(( "connection", LDAP_LEVEL_DETAIL1,
1528                    "connection_write conn %d  waking output.\n",
1529                    c->c_connid ));
1530 #else
1531         Debug( LDAP_DEBUG_TRACE,
1532                 "connection_write(%d): waking output for id=%ld\n",
1533                 s, c->c_connid, 0 );
1534 #endif
1535         ldap_pvt_thread_cond_signal( &c->c_write_cv );
1536
1537         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) )
1538                 slapd_set_read( s, 1 );
1539         if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) )
1540                 slapd_set_write( s, 1 );
1541         connection_return( c );
1542         ldap_pvt_thread_mutex_unlock( &connections_mutex );
1543         return 0;
1544 }
1545
1546
1547 /*
1548  * Create client side and server side connection structures, connected to
1549  * one another, for the front end to use for searches on arbitrary back ends.
1550  */
1551
1552 int connection_internal_open( Connection **conn, LDAP **ldp, const char *id )
1553 {
1554         int rc;
1555         ber_socket_t fd[2] = {-1,-1};
1556         Operation *op;
1557
1558         *conn=NULL;
1559         *ldp=NULL;
1560
1561         rc = lutil_pair( fd );
1562         if( rc == -1 ) {
1563                 return LDAP_OTHER;
1564         }
1565
1566         rc = connection_init( fd[1], "INT", "localhost",
1567       "localhost:0", "localhost:00", 0, 256, id );
1568         if( rc < 0 ) {
1569                 tcp_close( fd[0] );
1570                 tcp_close( fd[1] );
1571                 return LDAP_OTHER;
1572         }
1573         slapd_add_internal( fd[1] );
1574
1575         /* A search operation, number 0 */
1576         op = slap_op_alloc( NULL, 0, LDAP_REQ_SEARCH, 0);
1577         op->o_ndn = ch_strdup( id );
1578         op->o_protocol = LDAP_VERSION3;
1579
1580         (*conn) = connection_get( fd[1] );
1581         (*conn)->c_ops = op;
1582     (*conn)->c_conn_state = SLAP_C_ACTIVE;
1583
1584
1585         /* Create the client side of the connection */
1586         rc = ldap_open_internal_connection( ldp, &(fd[0]) );
1587         if( rc != LDAP_SUCCESS ) {
1588                 tcp_close( fd[0] );
1589                 return LDAP_OTHER;
1590         }
1591
1592         /* The connection_get() will have locked the connection's mutex */
1593         ldap_pvt_thread_mutex_unlock(  &((*conn)->c_mutex) );
1594
1595         return LDAP_SUCCESS;
1596 }
1597
1598
1599 void connection_internal_close( Connection *conn )
1600 {
1601         Operation *op = conn->c_ops;
1602
1603         slap_op_remove( &conn->c_ops, op );
1604         slap_op_free( op );
1605         connection_closing( conn );
1606         connection_close( conn );
1607 }