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

   1 #include "portable.h"
   2
   3 #include <stdio.h>
   4
   5 #include <ac/errno.h>
   6 #include <ac/signal.h>
   7 #include <ac/socket.h>
   8 #include <ac/string.h>
   9 #include <ac/time.h>
  10
  11 #include "slap.h"
  12
  13 #ifdef HAVE_WINSOCK
  14 #define EWOULDBLOCK WSAEWOULDBLOCK
  15 #endif
  16
  17 /* protected by connections_mutex */
  18 static ldap_pvt_thread_mutex_t connections_mutex;
  19 static Connection *connections = NULL;
  20 static int conn_index = -1;
  21 static long conn_nextid = 0;
  22
  23 /* structure state (protected by connections_mutex) */
  24 #define SLAP_C_UNINITIALIZED    0x0     /* MUST BE ZERO (0) */
  25 #define SLAP_C_UNUSED                   0x1
  26 #define SLAP_C_USED                             0x2
  27
  28 /* connection state (protected by c_mutex ) */
  29 #define SLAP_C_INVALID                  0x0     /* MUST BE ZERO (0) */
  30 #define SLAP_C_INACTIVE                 0x1     /* zero threads */
  31 #define SLAP_C_ACTIVE                   0x2 /* one or more threads */
  32 #define SLAP_C_BINDING                  0x3     /* binding */
  33 #define SLAP_C_CLOSING                  0x4     /* closing */
  34
  35 void slapd_remove(int s);
  36 static Connection* connection_get( int s );
  37
  38 static int connection_input( Connection *c );
  39 static void connection_close( Connection *c );
  40
  41 static int connection_op_activate( Connection *conn, Operation *op );
  42 static int connection_resched( Connection *conn );
  43
  44 struct co_arg {
  45         Connection      *co_conn;
  46         Operation       *co_op;
  47 };
  48
  49 /*
  50  * Initialize connection management infrastructure.
  51  */
  52 int connections_init(void)
  53 {
  54         int i;
  55
  56         assert( connections == NULL );
  57
  58         if( connections != NULL) {
  59                 Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
  60                         0, 0, 0 );
  61                 return -1;
  62         }
  63
  64         /* should check return of every call */
  65         ldap_pvt_thread_mutex_init( &connections_mutex );
  66
  67         connections = (Connection *) calloc( dtblsize, sizeof(Connection) );
  68
  69         if( connections == NULL ) {
  70                 Debug( LDAP_DEBUG_ANY,
  71                         "connections_init: allocation (%d*%ld) of connection array failed.\n",
  72                         dtblsize, (long) sizeof(Connection), 0 );
  73                 return -1;
  74         }
  75
  76         for ( i = 0; i < dtblsize; i++ )
  77                 memset( &connections[i], 0, sizeof(Connection) );
  78
  79         /*
  80          * per entry initialization of the Connection array initialization
  81          * will be done by connection_init()
  82          */
  83
  84         return 0;
  85 }
  86
  87 /*
  88  * Destroy connection management infrastructure.
  89  */
  90 int connections_destroy(void)
  91 {
  92         int i;
  93
  94         /* should check return of every call */
  95
  96         if( connections == NULL) {
  97                 Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
  98                         0, 0, 0 );
  99                 return -1;
 100         }
 101
 102         for ( i = 0; i < dtblsize; i++ ) {
 103                 ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
 104                 ldap_pvt_thread_mutex_destroy( &connections[i].c_write_mutex );
 105                 ldap_pvt_thread_cond_destroy( &connections[i].c_write_cv );
 106
 107                 free( &connections[i] );
 108         }
 109
 110         free( connections );
 111         connections = NULL;
 112
 113         ldap_pvt_thread_mutex_destroy( &connections_mutex );
 114         return 0;
 115 }
 116
 117 /*
 118  * shutdown all connections
 119  */
 120 int connections_shutdown(void)
 121 {
 122         int i;
 123
 124         ldap_pvt_thread_mutex_lock( &connections_mutex );
 125
 126         for ( i = 0; i < dtblsize; i++ ) {
 127                 if( connections[i].c_struct_state != SLAP_C_USED ) {
 128                         continue;
 129                 }
 130
 131                 ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
 132                 connection_closing( &connections[i] );
 133                 connection_close( &connections[i] );
 134                 ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
 135         }
 136
 137         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 138 }
 139
 140 static Connection* connection_get( int s )
 141 {
 142         Connection *c = NULL;
 143
 144         assert( connections != NULL );
 145
 146         if(s < 0) {
 147                 return NULL;
 148         }
 149
 150 #ifndef HAVE_WINSOCK
 151         assert( connections[s].c_struct_state == SLAP_C_USED );
 152         assert( connections[s].c_conn_state != SLAP_C_INVALID );
 153         assert( connections[s].c_sb.sb_sd != -1 );
 154
 155         c = &connections[s];
 156 #else
 157         {
 158                 int i;
 159
 160                 for(i=0; i<dtblsize; i++) {
 161                         if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 162                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 163                                 assert( connections[i].c_sb.sb_sd == 0 );
 164                                 break;
 165                         }
 166
 167                         if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 168                                 assert( connections[i].c_conn_state == SLAP_C_INVALID );
 169                                 assert( connections[i].c_sb.sb_sd == -1 );
 170                                 continue;
 171                         }
 172
 173                         assert( connections[i].c_struct_state == SLAP_C_USED );
 174                         assert( connections[i].c_conn_state != SLAP_C_INVALID );
 175                         assert( connections[i].c_sb.sb_sd != -1 );
 176
 177                         if( connections[i].c_sb.sb_sd == s ) {
 178                                 c = &connections[i];
 179                                 break;
 180                         }
 181                 }
 182         }
 183 #endif
 184
 185         if( c != NULL ) {
 186                 /* we do this BEFORE locking to aid in debugging */
 187                 Debug( LDAP_DEBUG_TRACE,
 188                         "connection_get(%d): got connid=%ld\n",
 189                         s, c->c_connid, 0 );
 190
 191                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 192         }
 193         return c;
 194 }
 195
 196 static void connection_return( Connection *c )
 197 {
 198         ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 199 }
 200
 201 long connection_init(
 202         int s,
 203         const char* name,
 204         const char* addr)
 205 {
 206         long id;
 207         Connection *c;
 208         assert( connections != NULL );
 209
 210         if( s < 0 ) {
 211                 return -1;
 212         }
 213
 214         assert( s >= 0 );
 215 #ifndef HAVE_WINSOCK
 216         assert( s < dtblsize );
 217 #endif
 218
 219         ldap_pvt_thread_mutex_lock( &connections_mutex );
 220
 221 #ifndef HAVE_WINSOCK
 222         c = &connections[s];
 223
 224 #else
 225         {
 226                 int i;
 227
 228         for( i=0; i < dtblsize; i++) {
 229             if( connections[i].c_struct_state == SLAP_C_UNINITIALIZED ) {
 230                 assert( connections[i].c_sb.sb_sd == 0 );
 231                 c = &connections[i];
 232                 break;
 233             }
 234
 235             if( connections[i].c_struct_state == SLAP_C_UNUSED ) {
 236                 assert( connections[i].c_sb.sb_sd == -1 );
 237                 c = &connections[i];
 238                 break;
 239             }
 240
 241             assert( connections[i].c_struct_state == SLAP_C_USED );
 242             assert( connections[i].c_conn_state != SLAP_C_INVALID );
 243             assert( connections[i].c_sb.sb_sd != -1 );
 244         }
 245
 246         if( c == NULL ) {
 247             ldap_pvt_thread_mutex_unlock( &connections_mutex );
 248             return -1;
 249         }
 250     }
 251 #endif
 252
 253     assert( c != NULL );
 254     assert( c->c_struct_state != SLAP_C_USED );
 255     assert( c->c_conn_state == SLAP_C_INVALID );
 256
 257     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
 258         c->c_dn = NULL;
 259         c->c_cdn = NULL;
 260         c->c_client_name = NULL;
 261         c->c_client_addr = NULL;
 262         c->c_ops = NULL;
 263         c->c_pending_ops = NULL;
 264
 265         lber_pvt_sb_init( &c->c_sb );
 266
 267         /* should check status of thread calls */
 268         ldap_pvt_thread_mutex_init( &c->c_mutex );
 269         ldap_pvt_thread_mutex_init( &c->c_write_mutex );
 270         ldap_pvt_thread_cond_init( &c->c_write_cv );
 271
 272         c->c_struct_state = SLAP_C_UNUSED;
 273     }
 274
 275     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 276
 277     assert( c->c_struct_state == SLAP_C_UNUSED );
 278     assert(     c->c_dn == NULL );
 279     assert(     c->c_cdn == NULL );
 280     assert( c->c_client_name == NULL );
 281     assert( c->c_client_addr == NULL );
 282     assert( c->c_ops == NULL );
 283     assert( c->c_pending_ops == NULL );
 284
 285     c->c_client_name = ch_strdup( name == NULL ? "" : name );
 286     c->c_client_addr = ch_strdup( addr );
 287
 288     c->c_n_ops_received = 0;
 289 #ifdef LDAP_COUNTERS
 290     c->c_n_ops_executing = 0;
 291     c->c_n_ops_pending = 0;
 292     c->c_n_ops_completed = 0;
 293 #endif
 294
 295     c->c_starttime = slap_get_time();
 296
 297     lber_pvt_sb_set_desc( &c->c_sb, s );
 298     lber_pvt_sb_set_io( &c->c_sb, &lber_pvt_sb_io_tcp, NULL );
 299
 300     if( lber_pvt_sb_set_nonblock( &c->c_sb, 1 ) < 0 ) {
 301         Debug( LDAP_DEBUG_ANY,
 302             "connection_init(%d, %s, %s): set nonblocking failed\n",
 303             s, c->c_client_name, c->c_client_addr);
 304     }
 305
 306     id = c->c_connid = conn_nextid++;
 307
 308     c->c_conn_state = SLAP_C_INACTIVE;
 309     c->c_struct_state = SLAP_C_USED;
 310
 311     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 312     ldap_pvt_thread_mutex_unlock( &connections_mutex );
 313
 314     return id;
 315 }
 316
 317 static void
 318 connection_destroy( Connection *c )
 319 {
 320     assert( connections != NULL );
 321     assert( c != NULL );
 322     assert( c->c_struct_state != SLAP_C_UNUSED );
 323     assert( c->c_conn_state != SLAP_C_INVALID );
 324     assert( c->c_ops == NULL );
 325
 326     c->c_struct_state = SLAP_C_UNUSED;
 327     c->c_conn_state = SLAP_C_INVALID;
 328
 329     c->c_version = 0;
 330     c->c_protocol = 0;
 331
 332     c->c_starttime = 0;
 333
 334     if(c->c_dn != NULL) {
 335         free(c->c_dn);
 336         c->c_dn = NULL;
 337     }
 338         if(c->c_cdn != NULL) {
 339                 free(c->c_cdn);
 340                 c->c_cdn = NULL;
 341         }
 342         if(c->c_client_name != NULL) {
 343                 free(c->c_client_name);
 344                 c->c_client_name = NULL;
 345         }
 346         if(c->c_client_addr != NULL) {
 347                 free(c->c_client_addr);
 348                 c->c_client_addr = NULL;
 349         }
 350
 351         if ( lber_pvt_sb_in_use(&c->c_sb) ) {
 352                 int sd = lber_pvt_sb_get_desc(&c->c_sb);
 353
 354                 slapd_remove( sd );
 355                 lber_pvt_sb_close( &c->c_sb );
 356
 357                 Statslog( LDAP_DEBUG_STATS,
 358                     "conn=%d fd=%d closed.\n",
 359                         c->c_connid, sd, 0, 0, 0 );
 360         }
 361
 362         lber_pvt_sb_destroy( &c->c_sb );
 363 }
 364
 365 int connection_state_closing( Connection *c )
 366 {
 367         int state;
 368         assert( c != NULL );
 369         assert( c->c_struct_state == SLAP_C_USED );
 370
 371     ldap_pvt_thread_mutex_lock( &c->c_mutex );
 372         state = c->c_conn_state;
 373     ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 374
 375         assert( state != SLAP_C_INVALID );
 376
 377         return state == SLAP_C_CLOSING;
 378 }
 379
 380 void connection_closing( Connection *c )
 381 {
 382         assert( connections != NULL );
 383         assert( c != NULL );
 384         assert( c->c_struct_state == SLAP_C_USED );
 385         assert( c->c_conn_state != SLAP_C_INVALID );
 386
 387         if( c->c_conn_state != SLAP_C_CLOSING ) {
 388                 Operation *o;
 389
 390                 Debug( LDAP_DEBUG_TRACE,
 391                         "connection_closing: readying conn=%ld sd=%d for close.\n",
 392                         c->c_connid, c->c_sb.sb_sd, 0 );
 393
 394                 /* update state to closing */
 395                 c->c_conn_state = SLAP_C_CLOSING;
 396
 397                 /* don't listen on this port anymore */
 398                 slapd_clr_read( c->c_sb.sb_sd, 1 );
 399
 400                 /* shutdown I/O -- not yet implemented */
 401
 402                 /* abandon active operations */
 403                 for( o = c->c_ops; o != NULL; o = o->o_next ) {
 404                         ldap_pvt_thread_mutex_lock( &o->o_abandonmutex );
 405                         o->o_abandon = 1;
 406                         ldap_pvt_thread_mutex_unlock( &o->o_abandonmutex );
 407                 }
 408
 409                 /* remove pending operations */
 410                 for( o = slap_op_pop( &c->c_pending_ops );
 411                         o != NULL;
 412                         o = slap_op_pop( &c->c_pending_ops ) )
 413                 {
 414                         slap_op_free( o );
 415                 }
 416
 417                 /* wake write blocked operations */
 418                 slapd_clr_write( c->c_sb.sb_sd, 1 );
 419                 ldap_pvt_thread_cond_signal( &c->c_write_cv );
 420         }
 421 }
 422
 423 static void connection_close( Connection *c )
 424 {
 425         assert( connections != NULL );
 426         assert( c != NULL );
 427         assert( c->c_struct_state == SLAP_C_USED );
 428         assert( c->c_conn_state == SLAP_C_CLOSING );
 429
 430         if( c->c_ops != NULL ) {
 431                 Debug( LDAP_DEBUG_TRACE,
 432                         "connection_close: deferring conn=%ld sd=%d.\n",
 433                         c->c_connid, c->c_sb.sb_sd, 0 );
 434
 435                 return;
 436         }
 437
 438         Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%ld sd=%d.\n",
 439                 c->c_connid, c->c_sb.sb_sd, 0 );
 440
 441         connection_destroy( c );
 442 }
 443
 444 long connections_nextid(void)
 445 {
 446         long id;
 447         assert( connections != NULL );
 448
 449         ldap_pvt_thread_mutex_lock( &connections_mutex );
 450
 451         id = conn_nextid;
 452
 453         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 454
 455         return id;
 456 }
 457
 458 Connection* connection_first(void)
 459 {
 460         assert( connections != NULL );
 461
 462         ldap_pvt_thread_mutex_lock( &connections_mutex );
 463
 464         assert( conn_index == -1 );
 465         conn_index = 0;
 466
 467         return connection_next(NULL);
 468 }
 469
 470 Connection* connection_next(Connection *c)
 471 {
 472         assert( connections != NULL );
 473         assert( conn_index != -1 );
 474         assert( conn_index <= dtblsize );
 475
 476         if( c != NULL ) {
 477                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 478         }
 479
 480         c = NULL;
 481
 482         for(; conn_index < dtblsize; conn_index++) {
 483                 if( connections[conn_index].c_struct_state == SLAP_C_UNINITIALIZED ) {
 484                         assert( connections[conn_index].c_conn_state == SLAP_C_INVALID );
 485 #ifndef HAVE_WINSOCK
 486                         continue;
 487 #else
 488                         break;
 489 #endif
 490                 }
 491
 492                 if( connections[conn_index].c_struct_state == SLAP_C_USED ) {
 493                         assert( connections[conn_index].c_conn_state != SLAP_C_INVALID );
 494                         c = &connections[conn_index++];
 495                         break;
 496                 }
 497
 498                 assert( connections[conn_index].c_struct_state == SLAP_C_UNUSED );
 499                 assert( connections[conn_index].c_conn_state == SLAP_C_INVALID );
 500         }
 501
 502         if( c != NULL ) {
 503                 ldap_pvt_thread_mutex_lock( &c->c_mutex );
 504         }
 505
 506         return c;
 507 }
 508
 509 void connection_done(Connection *c)
 510 {
 511         assert( connections != NULL );
 512         assert( conn_index != -1 );
 513         assert( conn_index <= dtblsize );
 514
 515         if( c != NULL ) {
 516                 ldap_pvt_thread_mutex_unlock( &c->c_mutex );
 517         }
 518
 519         conn_index = -1;
 520         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 521 }
 522
 523 /*
 524  * connection_activity - handle the request operation op on connection
 525  * conn.  This routine figures out what kind of operation it is and
 526  * calls the appropriate stub to handle it.
 527  */
 528
 529 static void *
 530 connection_operation( void *arg_v )
 531 {
 532         struct co_arg   *arg = arg_v;
 533         int tag = arg->co_op->o_tag;
 534         Connection *conn = arg->co_conn;
 535
 536 #ifdef LDAP_COUNTERS
 537         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 538         num_ops_initiated++;
 539         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 540 #endif
 541
 542         switch ( tag ) {
 543         case LDAP_REQ_BIND:
 544                 do_bind( conn, arg->co_op );
 545                 break;
 546
 547 #ifdef LDAP_COMPAT30
 548         case LDAP_REQ_UNBIND_30:
 549 #endif
 550         case LDAP_REQ_UNBIND:
 551                 do_unbind( conn, arg->co_op );
 552                 break;
 553
 554         case LDAP_REQ_ADD:
 555                 do_add( conn, arg->co_op );
 556                 break;
 557
 558 #ifdef LDAP_COMPAT30
 559         case LDAP_REQ_DELETE_30:
 560 #endif
 561         case LDAP_REQ_DELETE:
 562                 do_delete( conn, arg->co_op );
 563                 break;
 564
 565         case LDAP_REQ_MODRDN:
 566                 do_modrdn( conn, arg->co_op );
 567                 break;
 568
 569         case LDAP_REQ_MODIFY:
 570                 do_modify( conn, arg->co_op );
 571                 break;
 572
 573         case LDAP_REQ_COMPARE:
 574                 do_compare( conn, arg->co_op );
 575                 break;
 576
 577         case LDAP_REQ_SEARCH:
 578                 do_search( conn, arg->co_op );
 579                 break;
 580
 581 #ifdef LDAP_COMPAT30
 582         case LDAP_REQ_ABANDON_30:
 583 #endif
 584         case LDAP_REQ_ABANDON:
 585                 do_abandon( conn, arg->co_op );
 586                 break;
 587
 588         default:
 589                 Debug( LDAP_DEBUG_ANY, "unknown request 0x%lx\n",
 590                     arg->co_op->o_tag, 0, 0 );
 591                 break;
 592         }
 593
 594 #ifdef LDAP_COUNTERS
 595         ldap_pvt_thread_mutex_lock( &num_ops_mutex );
 596         num_ops_completed++;
 597         ldap_pvt_thread_mutex_unlock( &num_ops_mutex );
 598 #endif
 599
 600         ldap_pvt_thread_mutex_lock( &conn->c_mutex );
 601
 602 #ifdef LDAP_COUNTERS
 603         conn->c_n_ops_completed++;
 604 #endif
 605
 606         slap_op_remove( &conn->c_ops, arg->co_op );
 607         slap_op_free( arg->co_op );
 608         arg->co_op = NULL;
 609         arg->co_conn = NULL;
 610         free( (char *) arg );
 611         arg = NULL;
 612
 613         switch( tag ) {
 614 #ifdef LDAP_COMPAT30
 615         case LDAP_REQ_UNBIND_30:
 616 #endif
 617         case LDAP_REQ_UNBIND:
 618                 connection_closing( conn );
 619                 break;
 620
 621         case LDAP_REQ_BIND:
 622                 if( conn->c_conn_state == SLAP_C_BINDING) {
 623                         conn->c_conn_state = SLAP_C_ACTIVE;
 624                 }
 625         }
 626
 627         if( conn->c_conn_state == SLAP_C_CLOSING ) {
 628                 Debug( LDAP_DEBUG_TRACE,
 629                         "connection_operation: attempting closing conn=%ld sd=%d.\n",
 630                         conn->c_connid, conn->c_sb.sb_sd, 0 );
 631
 632                 connection_close( conn );
 633         }
 634
 635         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 636         active_threads--;
 637         if( active_threads < 1 ) {
 638                 ldap_pvt_thread_cond_signal(&active_threads_cond);
 639         }
 640         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 641
 642         connection_resched( conn );
 643
 644         ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
 645
 646         return NULL;
 647 }
 648
 649 int connection_read(int s)
 650 {
 651         int rc = 0;
 652         Connection *c;
 653         assert( connections != NULL );
 654
 655         ldap_pvt_thread_mutex_lock( &connections_mutex );
 656
 657         c = connection_get( s );
 658         if( c == NULL ) {
 659                 Debug( LDAP_DEBUG_ANY,
 660                         "connection_read(%d): no connection!\n",
 661                         s, 0, 0 );
 662                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 663                 return -1;
 664         }
 665
 666         if( c->c_conn_state == SLAP_C_CLOSING ) {
 667                 Debug( LDAP_DEBUG_TRACE,
 668                         "connection_read(%d): closing, ignoring input for id=%ld\n",
 669                         s, c->c_connid, 0 );
 670
 671                 connection_return( c );
 672                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 673                 return 0;
 674         }
 675
 676         Debug( LDAP_DEBUG_TRACE,
 677                 "connection_read(%d): checking for input on id=%ld\n",
 678                 s, c->c_connid, 0 );
 679
 680 #define CONNECTION_INPUT_LOOP 1
 681
 682 #ifdef DATA_READY_LOOP
 683         while(!rc && lber_pvt_sb_data_ready(&c->c_sb))
 684 #elif CONNECTION_INPUT_LOOP
 685         while(!rc)
 686 #endif
 687         {
 688                 rc = connection_input( c );
 689         }
 690
 691         if( rc < 0 ) {
 692                 Debug( LDAP_DEBUG_TRACE,
 693                         "connection_read(%d): input error=%d id=%ld, closing.\n",
 694                         s, rc, c->c_connid );
 695
 696                 connection_closing( c );
 697                 connection_close( c );
 698         }
 699
 700         connection_return( c );
 701         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 702         return 0;
 703 }
 704
 705 static int
 706 connection_input(
 707     Connection *conn
 708 )
 709 {
 710         Operation *op;
 711         unsigned long   tag, len;
 712         long            msgid;
 713         BerElement      *ber;
 714
 715         if ( conn->c_currentber == NULL && (conn->c_currentber = ber_alloc())
 716             == NULL ) {
 717                 Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
 718                 return -1;
 719         }
 720
 721         errno = 0;
 722         if ( (tag = ber_get_next( &conn->c_sb, &len, conn->c_currentber ))
 723             != LDAP_TAG_MESSAGE )
 724         {
 725                 int err = errno;
 726
 727                 Debug( LDAP_DEBUG_TRACE,
 728                         "ber_get_next on fd %d failed errno %d (%s)\n",
 729                         lber_pvt_sb_get_desc(&conn->c_sb), err,
 730                         err > -1 && err < sys_nerr ?  sys_errlist[err] : "unknown" );
 731                 Debug( LDAP_DEBUG_TRACE,
 732                         "\t*** got %ld of %lu so far\n",
 733                         (long)(conn->c_currentber->ber_rwptr - conn->c_currentber->ber_buf),
 734                         conn->c_currentber->ber_len, 0 );
 735
 736                 if ( err != EWOULDBLOCK && err != EAGAIN ) {
 737                         /* log, close and send error */
 738                         ber_free( conn->c_currentber, 1 );
 739                         conn->c_currentber = NULL;
 740
 741                         return -2;
 742                 }
 743                 return 1;
 744         }
 745
 746         ber = conn->c_currentber;
 747         conn->c_currentber = NULL;
 748
 749         if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
 750                 /* log, close and send error */
 751                 Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0,
 752                     0 );
 753                 ber_free( ber, 1 );
 754                 return -1;
 755         }
 756
 757         if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
 758                 /* log, close and send error */
 759                 Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0,
 760                     0 );
 761                 ber_free( ber, 1 );
 762
 763                 return -1;
 764         }
 765
 766 #ifdef LDAP_COMPAT30
 767         if ( conn->c_version == 30 ) {
 768                 (void) ber_skip_tag( ber, &len );
 769         }
 770 #endif
 771
 772         op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++ );
 773
 774         if ( conn->c_conn_state == SLAP_C_BINDING
 775                 || conn->c_conn_state == SLAP_C_CLOSING )
 776         {
 777                 Debug( LDAP_DEBUG_ANY, "deferring operation\n", 0, 0, 0 );
 778                 slap_op_add( &conn->c_pending_ops, op );
 779
 780         } else {
 781                 connection_op_activate( conn, op );
 782         }
 783
 784 #ifdef NO_THREADS
 785         if ( conn->c_struct_state != SLAP_C_USED ) {
 786                 /* connection must have got closed underneath us */
 787                 return 1;
 788         }
 789 #endif
 790         assert( conn->c_struct_state == SLAP_C_USED );
 791
 792         return 0;
 793 }
 794
 795 static int
 796 connection_resched( Connection *conn )
 797 {
 798         Operation *op;
 799
 800         if( conn->c_conn_state != SLAP_C_ACTIVE ) {
 801                 /* other states need different handling */
 802                 return 0;
 803         }
 804
 805         for( op = slap_op_pop( &conn->c_pending_ops );
 806                 op != NULL;
 807                 op = slap_op_pop( &conn->c_pending_ops ) )
 808         {
 809                 /* pending operations should not be marked for abandonment */
 810                 assert(!op->o_abandon);
 811
 812                 connection_op_activate( conn, op );
 813
 814                 if ( conn->c_conn_state == SLAP_C_BINDING ) {
 815                         break;
 816                 }
 817         }
 818         return 0;
 819 }
 820
 821 static int connection_op_activate( Connection *conn, Operation *op )
 822 {
 823         struct co_arg *arg;
 824         char *tmpdn;
 825         int status;
 826         unsigned long tag = op->o_tag;
 827
 828         if ( conn->c_dn != NULL ) {
 829                 tmpdn = ch_strdup( conn->c_dn );
 830         } else {
 831                 tmpdn = NULL;
 832         }
 833
 834         arg = (struct co_arg *) ch_malloc( sizeof(struct co_arg) );
 835         arg->co_conn = conn;
 836         arg->co_op = op;
 837
 838         arg->co_op->o_dn = ch_strdup( tmpdn != NULL ? tmpdn : "" );
 839         arg->co_op->o_ndn = dn_normalize_case( ch_strdup( arg->co_op->o_dn ) );
 840
 841         slap_op_add( &conn->c_ops, arg->co_op );
 842
 843         if(tag == LDAP_REQ_BIND) {
 844                 conn->c_conn_state = SLAP_C_BINDING;
 845         }
 846
 847         if ( tmpdn != NULL ) {
 848                 free( tmpdn );
 849         }
 850
 851         ldap_pvt_thread_mutex_lock( &active_threads_mutex );
 852         active_threads++;
 853         ldap_pvt_thread_mutex_unlock( &active_threads_mutex );
 854
 855         status = ldap_pvt_thread_create( &arg->co_op->o_tid, 1,
 856                                          connection_operation, (void *) arg );
 857
 858         if ( status != 0 ) {
 859                 Debug( LDAP_DEBUG_ANY,
 860                 "ldap_pvt_thread_create failed (%d)\n", status, 0, 0 );
 861
 862                 /* should move op to pending list */
 863         }
 864
 865         return status;
 866 }
 867
 868 int connection_write(int s)
 869 {
 870         Connection *c;
 871         assert( connections != NULL );
 872
 873         ldap_pvt_thread_mutex_lock( &connections_mutex );
 874
 875         c = connection_get( s );
 876         if( c == NULL ) {
 877                 Debug( LDAP_DEBUG_ANY,
 878                         "connection_write(%d): no connection!\n",
 879                         s, 0, 0 );
 880                 ldap_pvt_thread_mutex_unlock( &connections_mutex );
 881                 return -1;
 882         }
 883
 884         Debug( LDAP_DEBUG_TRACE,
 885                 "connection_write(%d): waking output for id=%ld\n",
 886                 s, c->c_connid, 0 );
 887
 888         ldap_pvt_thread_cond_signal( &c->c_write_cv );
 889
 890         connection_return( c );
 891         ldap_pvt_thread_mutex_unlock( &connections_mutex );
 892         return 0;
 893 }