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

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