git.sur5r.net Git - openldap/blob - libraries/libldap/request.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2005 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* Portions Copyright (c) 1995 Regents of the University of Michigan.
  16  * All rights reserved.
  17  */
  18 /* This notice applies to changes, created by or for Novell, Inc.,
  19  * to preexisting works for which notices appear elsewhere in this file.
  20  *
  21  * Copyright (C) 1999, 2000 Novell, Inc. All Rights Reserved.
  22  *
  23  * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND TREATIES.
  24  * USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT TO VERSION
  25  * 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS AVAILABLE AT
  26  * HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE" IN THE
  27  * TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION OF THIS
  28  * WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP PUBLIC
  29  * LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT THE
  30  * PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
  31  *---
  32  * Modification to OpenLDAP source by Novell, Inc.
  33  * April 2000 sfs  Added code to chase V3 referrals
  34  *  request.c - sending of ldap requests; handling of referrals
  35  *---
  36  * Note: A verbatim copy of version 2.0.1 of the OpenLDAP Public License
  37  * can be found in the file "build/LICENSE-2.0.1" in this distribution
  38  * of OpenLDAP Software.
  39  */
  40
  41 #include "portable.h"
  42
  43 #include <stdio.h>
  44
  45 #include <ac/stdlib.h>
  46
  47 #include <ac/errno.h>
  48 #include <ac/socket.h>
  49 #include <ac/string.h>
  50 #include <ac/time.h>
  51 #include <ac/unistd.h>
  52
  53 #include "ldap-int.h"
  54 #include "lber.h"
  55
  56 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPURLDesc *srv, int any ));
  57 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  58 static void ldap_free_request_int LDAP_P(( LDAP *ld, LDAPRequest *lr ));
  59
  60 static BerElement *
  61 re_encode_request( LDAP *ld,
  62         BerElement *origber,
  63         ber_int_t msgid,
  64         int sref,
  65         LDAPURLDesc *srv,
  66         int *type );
  67
  68 BerElement *
  69 ldap_alloc_ber_with_options( LDAP *ld )
  70 {
  71         BerElement      *ber;
  72
  73     if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULL ) {
  74                 ld->ld_errno = LDAP_NO_MEMORY;
  75         }
  76
  77         return( ber );
  78 }
  79
  80
  81 void
  82 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  83 {
  84         ber->ber_options = ld->ld_lberoptions;
  85 }
  86
  87
  88 ber_int_t
  89 ldap_send_initial_request(
  90         LDAP *ld,
  91         ber_tag_t msgtype,
  92         const char *dn,
  93         BerElement *ber,
  94         ber_int_t msgid)
  95 {
  96         LDAPURLDesc     *servers;
  97         int rc;
  98
  99         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
 100
 101         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
 102                 /* not connected yet */
 103                 int rc = ldap_open_defconn( ld );
 104
 105                 if( rc < 0 ) {
 106                         ber_free( ber, 1 );
 107                         return( -1 );
 108                 }
 109
 110                 Debug( LDAP_DEBUG_TRACE,
 111                         "ldap_open_defconn: successful\n",
 112                         0, 0, 0 );
 113         }
 114
 115         {
 116                 /*
 117                  * use of DNS is turned off or this is an X.500 DN...
 118                  * use our default connection
 119                  */
 120                 servers = NULL;
 121         }
 122
 123 #ifdef LDAP_CONNECTIONLESS
 124         if (LDAP_IS_UDP(ld)) {
 125                 if (msgtype == LDAP_REQ_BIND) {
 126                         if (ld->ld_options.ldo_cldapdn)
 127                                 ldap_memfree(ld->ld_options.ldo_cldapdn);
 128                         ld->ld_options.ldo_cldapdn = ldap_strdup(dn);
 129                         return 0;
 130                 }
 131                 if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
 132                         return LDAP_PARAM_ERROR;
 133         }
 134 #endif
 135 #ifdef LDAP_R_COMPILE
 136         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 137 #endif
 138         rc = ldap_send_server_request( ld, ber, msgid, NULL,
 139                 servers, NULL, NULL );
 140 #ifdef LDAP_R_COMPILE
 141         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 142 #endif
 143         if (servers)
 144                 ldap_free_urllist(servers);
 145         return(rc);
 146 }
 147
 148
 149 int
 150 ldap_int_flush_request(
 151         LDAP *ld,
 152         LDAPRequest *lr )
 153 {
 154         LDAPConn *lc = lr->lr_conn;
 155
 156         if ( ber_flush( lc->lconn_sb, lr->lr_ber, 0 ) != 0 ) {
 157                 if ( errno == EAGAIN ) {
 158                         /* need to continue write later */
 159                         lr->lr_status = LDAP_REQST_WRITING;
 160                         ldap_mark_select_write( ld, lc->lconn_sb );
 161                         ld->ld_errno = LDAP_BUSY;
 162                         return -2;
 163                 } else {
 164                         ld->ld_errno = LDAP_SERVER_DOWN;
 165                         ldap_free_request( ld, lr );
 166                         ldap_free_connection( ld, lc, 0, 0 );
 167                         return( -1 );
 168                 }
 169         } else {
 170                 if ( lr->lr_parent == NULL ) {
 171                         lr->lr_ber->ber_end = lr->lr_ber->ber_ptr;
 172                         lr->lr_ber->ber_ptr = lr->lr_ber->ber_buf;
 173                 }
 174                 lr->lr_status = LDAP_REQST_INPROGRESS;
 175
 176                 /* sent -- waiting for a response */
 177                 ldap_mark_select_read( ld, lc->lconn_sb );
 178         }
 179         return 0;
 180 }
 181
 182 int
 183 ldap_send_server_request(
 184         LDAP *ld,
 185         BerElement *ber,
 186         ber_int_t msgid,
 187         LDAPRequest *parentreq,
 188         LDAPURLDesc *srvlist,
 189         LDAPConn *lc,
 190         LDAPreqinfo *bind )
 191 {
 192         LDAPRequest     *lr;
 193         int incparent, rc;
 194
 195         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 196
 197         incparent = 0;
 198         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 199
 200         if ( lc == NULL ) {
 201                 if ( srvlist == NULL ) {
 202                         lc = ld->ld_defconn;
 203                 } else {
 204                         lc = find_connection( ld, srvlist, 1 );
 205                         if ( lc == NULL ) {
 206                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 207                                         /* Remember the bind in the parent */
 208                                         incparent = 1;
 209                                         ++parentreq->lr_outrefcnt;
 210                                 }
 211                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 212                         }
 213                 }
 214         }
 215
 216         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 217                 ber_free( ber, 1 );
 218                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 219                         ld->ld_errno = LDAP_SERVER_DOWN;
 220                 }
 221                 if ( incparent ) {
 222                         /* Forget about the bind */
 223                         --parentreq->lr_outrefcnt;
 224                 }
 225                 return( -1 );
 226         }
 227
 228         use_connection( ld, lc );
 229
 230         /* If we still have an incomplete write, try to finish it before
 231          * dealing with the new request. If we don't finish here, return
 232          * LDAP_BUSY and let the caller retry later. We only allow a single
 233          * request to be in WRITING state.
 234          */
 235         rc = 0;
 236         if ( ld->ld_requests &&
 237                 ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
 238                 ldap_int_flush_request( ld, ld->ld_requests ) < 0 )
 239         {
 240                 rc = -1;
 241         }
 242         if ( rc ) return rc;
 243
 244         lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ));
 245         if ( lr == NULL ) {
 246                 ld->ld_errno = LDAP_NO_MEMORY;
 247                 ldap_free_connection( ld, lc, 0, 0 );
 248                 ber_free( ber, 1 );
 249                 if ( incparent ) {
 250                         /* Forget about the bind */
 251                         --parentreq->lr_outrefcnt;
 252                 }
 253                 return( -1 );
 254         }
 255         lr->lr_msgid = msgid;
 256         lr->lr_status = LDAP_REQST_INPROGRESS;
 257         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 258         lr->lr_ber = ber;
 259         lr->lr_conn = lc;
 260         if ( parentreq != NULL ) {      /* sub-request */
 261                 if ( !incparent ) {
 262                         /* Increment if we didn't do it before the bind */
 263                         ++parentreq->lr_outrefcnt;
 264                 }
 265                 lr->lr_origid = parentreq->lr_origid;
 266                 lr->lr_parentcnt = ++parentreq->lr_parentcnt;
 267                 lr->lr_parent = parentreq;
 268                 lr->lr_refnext = parentreq->lr_child;
 269                 parentreq->lr_child = lr;
 270         } else {                        /* original request */
 271                 lr->lr_origid = lr->lr_msgid;
 272         }
 273
 274         /* Extract requestDN for future reference */
 275         {
 276                 BerElement tmpber = *ber;
 277                 ber_int_t       bint;
 278                 ber_tag_t       tag, rtag;
 279
 280                 ber_reset( &tmpber, 1 );
 281                 rtag = ber_scanf( &tmpber, "{it", /*}*/ &bint, &tag );
 282                 switch ( tag ) {
 283                 case LDAP_REQ_BIND:
 284                         rtag = ber_scanf( &tmpber, "{i" /*}*/, &bint );
 285                         break;
 286                 case LDAP_REQ_DELETE:
 287                         break;
 288                 default:
 289                         rtag = ber_scanf( &tmpber, "{" /*}*/ );
 290                 case LDAP_REQ_ABANDON:
 291                         break;
 292                 }
 293                 if ( tag != LDAP_REQ_ABANDON ) {
 294                         ber_skip_tag( &tmpber, &lr->lr_dn.bv_len );
 295                         lr->lr_dn.bv_val = tmpber.ber_ptr;
 296                 }
 297         }
 298
 299         lr->lr_prev = NULL;
 300         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 301                 lr->lr_next->lr_prev = lr;
 302         }
 303         ld->ld_requests = lr;
 304
 305         ld->ld_errno = LDAP_SUCCESS;
 306         if ( ldap_int_flush_request( ld, lr ) == -1 ) {
 307                 msgid = -1;
 308         }
 309
 310         return( msgid );
 311 }
 312
 313 LDAPConn *
 314 ldap_new_connection( LDAP *ld, LDAPURLDesc *srvlist, int use_ldsb,
 315         int connect, LDAPreqinfo *bind )
 316 {
 317         LDAPConn        *lc;
 318         LDAPURLDesc     *srv;
 319
 320         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection %d %d %d\n",
 321                 use_ldsb, connect, (bind != NULL) );
 322         /*
 323          * make a new LDAP server connection
 324          * XXX open connection synchronously for now
 325          */
 326         lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ) );
 327         if ( lc == NULL ) {
 328                 ld->ld_errno = LDAP_NO_MEMORY;
 329                 return( NULL );
 330         }
 331
 332         if ( use_ldsb ) {
 333                 assert( ld->ld_sb != NULL );
 334                 lc->lconn_sb = ld->ld_sb;
 335
 336         } else {
 337                 lc->lconn_sb = ber_sockbuf_alloc();
 338                 if ( lc->lconn_sb == NULL ) {
 339                         LDAP_FREE( (char *)lc );
 340                         ld->ld_errno = LDAP_NO_MEMORY;
 341                         return( NULL );
 342                 }
 343         }
 344
 345         if ( connect ) {
 346                 for ( srv = srvlist; srv != NULL; srv = srv->lud_next ) {
 347                         if ( ldap_int_open_connection( ld, lc, srv, 0 ) != -1 )
 348                         {
 349                                 break;
 350                         }
 351                 }
 352
 353                 if ( srv == NULL ) {
 354                         if ( !use_ldsb ) {
 355                                 ber_sockbuf_free( lc->lconn_sb );
 356                         }
 357                         LDAP_FREE( (char *)lc );
 358                         ld->ld_errno = LDAP_SERVER_DOWN;
 359                         return( NULL );
 360                 }
 361
 362                 lc->lconn_server = ldap_url_dup( srv );
 363         }
 364
 365         lc->lconn_status = LDAP_CONNST_CONNECTED;
 366         lc->lconn_next = ld->ld_conns;
 367         ld->ld_conns = lc;
 368
 369         /*
 370          * XXX for now, we always do a synchronous bind.  This will have
 371          * to change in the long run...
 372          */
 373         if ( bind != NULL) {
 374                 int             err = 0;
 375                 LDAPConn        *savedefconn;
 376
 377                 /* Set flag to prevent additional referrals
 378                  * from being processed on this
 379                  * connection until the bind has completed
 380                  */
 381                 lc->lconn_rebind_inprogress = 1;
 382                 /* V3 rebind function */
 383                 if ( ld->ld_rebind_proc != NULL) {
 384                         LDAPURLDesc     *srvfunc;
 385
 386                         srvfunc = ldap_url_dup( srvlist );
 387                         if ( srvfunc == NULL ) {
 388                                 ld->ld_errno = LDAP_NO_MEMORY;
 389                                 err = -1;
 390                         } else {
 391                                 savedefconn = ld->ld_defconn;
 392                                 ++lc->lconn_refcnt;     /* avoid premature free */
 393                                 ld->ld_defconn = lc;
 394
 395                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 396 #ifdef LDAP_R_COMPILE
 397                                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 398                                 ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 399 #endif
 400                                 err = (*ld->ld_rebind_proc)( ld,
 401                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 402                                         ld->ld_rebind_params );
 403 #ifdef LDAP_R_COMPILE
 404                                 ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 405                                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 406 #endif
 407
 408                                 ld->ld_defconn = savedefconn;
 409                                 --lc->lconn_refcnt;
 410
 411                                 if ( err != 0 ) {
 412                                         err = -1;
 413                                         ldap_free_connection( ld, lc, 1, 0 );
 414                                         lc = NULL;
 415                                 }
 416                                 ldap_free_urldesc( srvfunc );
 417                         }
 418                 } else {
 419                         savedefconn = ld->ld_defconn;
 420                         ++lc->lconn_refcnt;     /* avoid premature free */
 421                         ld->ld_defconn = lc;
 422
 423                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 424 #ifdef LDAP_R_COMPILE
 425                         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 426                         ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 427 #endif
 428                         if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
 429                                 err = -1;
 430                         }
 431 #ifdef LDAP_R_COMPILE
 432                         ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 433                         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 434 #endif
 435                         ld->ld_defconn = savedefconn;
 436                         --lc->lconn_refcnt;
 437
 438                         if ( err != 0 ) {
 439                                 ldap_free_connection( ld, lc, 1, 0 );
 440                                 lc = NULL;
 441                         }
 442                 }
 443                 if ( lc != NULL )
 444                         lc->lconn_rebind_inprogress = 0;
 445         }
 446
 447         return( lc );
 448 }
 449
 450
 451 static LDAPConn *
 452 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 453 /*
 454  * return an existing connection (if any) to the server srv
 455  * if "any" is non-zero, check for any server in the "srv" chain
 456  */
 457 {
 458         LDAPConn        *lc;
 459         LDAPURLDesc     *lcu, *lsu;
 460         int lcu_port, lsu_port;
 461
 462         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 463                 lcu = lc->lconn_server;
 464                 lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
 465                         lcu->lud_port );
 466
 467                 for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
 468                         lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
 469                                 lsu->lud_port );
 470
 471                         if ( strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
 472                                 && lcu->lud_host != NULL && *lcu->lud_host != '\0'
 473                             && lsu->lud_host != NULL && *lsu->lud_host != '\0'
 474                                 && strcasecmp( lsu->lud_host, lcu->lud_host ) == 0
 475                             && lsu_port == lcu_port )
 476                         {
 477                                 return lc;
 478                         }
 479
 480                         if ( !any ) break;
 481                 }
 482         }
 483
 484         return NULL;
 485 }
 486
 487
 488
 489 static void
 490 use_connection( LDAP *ld, LDAPConn *lc )
 491 {
 492         ++lc->lconn_refcnt;
 493         lc->lconn_lastused = time( NULL );
 494 }
 495
 496
 497 void
 498 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 499 {
 500         LDAPConn        *tmplc, *prevlc;
 501
 502         Debug( LDAP_DEBUG_TRACE,
 503                 "ldap_free_connection %d %d\n",
 504                 force, unbind, 0 );
 505
 506         if ( force || --lc->lconn_refcnt <= 0 ) {
 507                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 508                         ldap_mark_select_clear( ld, lc->lconn_sb );
 509                         if ( unbind ) {
 510                                 ldap_send_unbind( ld, lc->lconn_sb,
 511                                                 NULL, NULL );
 512                         }
 513                 }
 514
 515                 if ( lc->lconn_ber != NULL ) {
 516                         ber_free( lc->lconn_ber, 1 );
 517                 }
 518
 519                 ldap_int_sasl_close( ld, lc );
 520
 521                 prevlc = NULL;
 522                 for ( tmplc = ld->ld_conns;
 523                         tmplc != NULL;
 524                         tmplc = tmplc->lconn_next )
 525                 {
 526                         if ( tmplc == lc ) {
 527                                 if ( prevlc == NULL ) {
 528                                     ld->ld_conns = tmplc->lconn_next;
 529                                 } else {
 530                                     prevlc->lconn_next = tmplc->lconn_next;
 531                                 }
 532                                 break;
 533                         }
 534                         prevlc = tmplc;
 535                 }
 536                 ldap_free_urllist( lc->lconn_server );
 537 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 538                 if ( lc->lconn_krbinstance != NULL ) {
 539                         LDAP_FREE( lc->lconn_krbinstance );
 540                 }
 541 #endif
 542
 543                 /* FIXME: is this at all possible? */
 544                 if ( force ) {
 545                         LDAPRequest     *lr;
 546
 547                         for ( lr = ld->ld_requests; lr; ) {
 548                                 LDAPRequest     *lr_next = lr->lr_next;
 549
 550                                 if ( lr->lr_conn == lc ) {
 551                                         ldap_free_request_int( ld, lr );
 552                                 }
 553
 554                                 lr = lr_next;
 555                         }
 556                 }
 557                 if ( lc->lconn_sb != ld->ld_sb ) {
 558                         ber_sockbuf_free( lc->lconn_sb );
 559                 }
 560                 if ( lc->lconn_rebind_queue != NULL) {
 561                         int i;
 562                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 563                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 564                         }
 565                         LDAP_FREE( lc->lconn_rebind_queue );
 566                 }
 567                 LDAP_FREE( lc );
 568                 Debug( LDAP_DEBUG_TRACE,
 569                         "ldap_free_connection: actually freed\n",
 570                         0, 0, 0 );
 571         } else {
 572                 lc->lconn_lastused = time( NULL );
 573                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 574                                 lc->lconn_refcnt, 0, 0 );
 575         }
 576 }
 577
 578
 579 #ifdef LDAP_DEBUG
 580 void
 581 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 582 {
 583         LDAPConn        *lc;
 584         char            timebuf[32];
 585
 586         fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
 587         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 588                 if ( lc->lconn_server != NULL ) {
 589                         fprintf( stderr, "* host: %s  port: %d%s\n",
 590                             ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 591                             : lc->lconn_server->lud_host,
 592                             lc->lconn_server->lud_port, ( lc->lconn_sb ==
 593                             ld->ld_sb ) ? "  (default)" : "" );
 594                 }
 595                 fprintf( stderr, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 596                     ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
 597                     "NeedSocket" : ( lc->lconn_status ==
 598                     LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
 599                 fprintf( stderr, "  last used: %s",
 600                     ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
 601                 if( lc->lconn_rebind_inprogress ) {
 602                         fprintf( stderr, "  rebind in progress\n");
 603                         if( lc->lconn_rebind_queue != NULL) {
 604                                 int i = 0;
 605                                 for( ;lc->lconn_rebind_queue[i] != NULL; i++) {
 606                                         int j = 0;
 607                                         for( ;lc->lconn_rebind_queue[i][j] != 0; j++) {
 608                                                 fprintf( stderr, "    queue %d entry %d - %s\n",
 609                                                         i, j, lc->lconn_rebind_queue[i][j]);
 610                                         }
 611                                 }
 612                         } else {
 613                                 fprintf( stderr, "    queue is empty\n");
 614                         }
 615                 }
 616                 fprintf(stderr, "\n");
 617                 if ( !all ) {
 618                         break;
 619                 }
 620         }
 621 }
 622
 623
 624 void
 625 ldap_dump_requests_and_responses( LDAP *ld )
 626 {
 627         LDAPRequest     *lr;
 628         LDAPMessage     *lm, *l;
 629
 630 #ifdef LDAP_R_COMPILE
 631         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 632 #endif
 633         fprintf( stderr, "** Outstanding Requests:\n" );
 634         if (( lr = ld->ld_requests ) == NULL ) {
 635                 fprintf( stderr, "   Empty\n" );
 636         }
 637         for ( ; lr != NULL; lr = lr->lr_next ) {
 638             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 639                 lr->lr_msgid, lr->lr_origid,
 640                 ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 641                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 642                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 643                 ( lr->lr_status == LDAP_REQST_WRITING) ? "Writing" :
 644                 ( lr->lr_status == LDAP_REQST_COMPLETED ? "Request Completed" : "Invalid Status"));
 645             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 646                     lr->lr_outrefcnt, lr->lr_parentcnt );
 647         }
 648 #ifdef LDAP_R_COMPILE
 649         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 650 #endif
 651         fprintf( stderr, "** Response Queue:\n" );
 652         if (( lm = ld->ld_responses ) == NULL ) {
 653                 fprintf( stderr, "   Empty\n" );
 654         }
 655         for ( ; lm != NULL; lm = lm->lm_next ) {
 656                 fprintf( stderr, " * msgid %d,  type %lu\n",
 657                     lm->lm_msgid, (unsigned long) lm->lm_msgtype );
 658                 if (( l = lm->lm_chain ) != NULL ) {
 659                         fprintf( stderr, "   chained responses:\n" );
 660                         for ( ; l != NULL; l = l->lm_chain ) {
 661                                 fprintf( stderr,
 662                                     "  * msgid %d,  type %lu\n",
 663                                     l->lm_msgid,
 664                                     (unsigned long) l->lm_msgtype );
 665                         }
 666                 }
 667         }
 668 }
 669 #endif /* LDAP_DEBUG */
 670
 671 static void
 672 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 673 {
 674         if ( lr->lr_prev == NULL ) {
 675                 /* free'ing the first request? */
 676                 assert( ld->ld_requests == lr );
 677                 ld->ld_requests = lr->lr_next;
 678
 679         } else {
 680                 lr->lr_prev->lr_next = lr->lr_next;
 681         }
 682
 683         if ( lr->lr_next != NULL ) {
 684                 lr->lr_next->lr_prev = lr->lr_prev;
 685         }
 686
 687         if ( lr->lr_ber != NULL ) {
 688                 ber_free( lr->lr_ber, 1 );
 689         }
 690
 691         if ( lr->lr_res_error != NULL ) {
 692                 LDAP_FREE( lr->lr_res_error );
 693         }
 694
 695         if ( lr->lr_res_matched != NULL ) {
 696                 LDAP_FREE( lr->lr_res_matched );
 697         }
 698
 699         LDAP_FREE( lr );
 700 }
 701
 702 void
 703 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 704 {
 705         LDAPRequest     **ttmplr;
 706
 707         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 708                 lr->lr_origid, lr->lr_msgid, 0 );
 709
 710         /* free all referrals (child requests) */
 711         while ( lr->lr_child )
 712                 ldap_free_request( ld, lr->lr_child );
 713
 714         if ( lr->lr_parent != NULL ) {
 715                 --lr->lr_parent->lr_outrefcnt;
 716                 for ( ttmplr = &lr->lr_parent->lr_child; *ttmplr && *ttmplr != lr; ttmplr = &(*ttmplr)->lr_refnext );
 717                 if ( *ttmplr == lr )
 718                         *ttmplr = lr->lr_refnext;
 719         }
 720         ldap_free_request_int( ld, lr );
 721 }
 722
 723 /*
 724  * call first time with *cntp = -1
 725  * when returns *cntp == -1, no referrals are left
 726  *
 727  * NOTE: may replace *refsp, or shuffle the contents
 728  * of the original array.
 729  */
 730 static int ldap_int_nextref(
 731         LDAP                    *ld,
 732         char                    ***refsp,
 733         int                     *cntp,
 734         void                    *params )
 735 {
 736         assert( refsp != NULL );
 737         assert( *refsp != NULL );
 738         assert( cntp != NULL );
 739
 740         if ( *cntp < -1 ) {
 741                 *cntp = -1;
 742                 return -1;
 743         }
 744
 745         (*cntp)++;
 746
 747         if ( (*refsp)[ *cntp ] == NULL ) {
 748                 *cntp = -1;
 749         }
 750
 751         return 0;
 752 }
 753
 754 /*
 755  * Chase v3 referrals
 756  *
 757  * Parameters:
 758  *  (IN) ld = LDAP connection handle
 759  *  (IN) lr = LDAP Request structure
 760  *  (IN) refs = array of pointers to referral strings that we will chase
 761  *              The array will be free'd by this function when no longer needed
 762  *  (IN) sref != 0 if following search reference
 763  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 764  *  (OUT) hadrefp = 1 if sucessfully followed referral
 765  *
 766  * Return value - number of referrals followed
 767  */
 768 int
 769 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 770 {
 771         char            *unfollowed;
 772         int              unfollowedcnt = 0;
 773         LDAPRequest     *origreq;
 774         LDAPURLDesc     *srv = NULL;
 775         BerElement      *ber;
 776         char            **refarray = NULL;
 777         LDAPConn        *lc;
 778         int                      rc, count, i, j, id;
 779         LDAPreqinfo  rinfo;
 780
 781         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 782         *hadrefp = 0;
 783
 784         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 785
 786         unfollowed = NULL;
 787         rc = count = 0;
 788
 789         /* If no referrals in array, return */
 790         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 791                 rc = 0;
 792                 goto done;
 793         }
 794
 795         /* Check for hop limit exceeded */
 796         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 797                 Debug( LDAP_DEBUG_ANY,
 798                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 799                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 800             rc = -1;
 801                 goto done;
 802         }
 803
 804         /* find original request */
 805         for ( origreq = lr;
 806                 origreq->lr_parent != NULL;
 807                 origreq = origreq->lr_parent )
 808         {
 809                 /* empty */ ;
 810         }
 811
 812         refarray = refs;
 813         refs = NULL;
 814
 815         if ( ld->ld_nextref_proc == NULL ) {
 816                 ld->ld_nextref_proc = ldap_int_nextref;
 817         }
 818
 819         /* parse out & follow referrals */
 820         i = -1;
 821         for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
 822                         i != -1;
 823                         ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
 824         {
 825
 826                 /* Parse the referral URL */
 827                 if (( rc = ldap_url_parse_ext( refarray[i], &srv)) != LDAP_SUCCESS) {
 828                         ld->ld_errno = rc;
 829                         rc = -1;
 830                         goto done;
 831                 }
 832
 833                 if( srv->lud_crit_exts ) {
 834                         /* we do not support any extensions */
 835                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 836                         rc = -1;
 837                         goto done;
 838                 }
 839
 840                 /* treat ldap://hostpart and ldap://hostpart/ the same */
 841                 if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
 842                         LDAP_FREE( srv->lud_dn );
 843                         srv->lud_dn = NULL;
 844                 }
 845
 846                 /* check connection for re-bind in progress */
 847                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 848                         /* See if we've already requested this DN with this conn */
 849                         LDAPRequest *lp;
 850                         int looped = 0;
 851                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
 852                         for (lp = origreq; lp; ) {
 853                                 if ( lp->lr_conn == lc ) {
 854                                         if ( len == lp->lr_dn.bv_len ) {
 855                                                 if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val,
 856                                                         len ))
 857                                                         continue;
 858                                                 looped = 1;
 859                                                 break;
 860                                         }
 861                                 }
 862                                 if ( lp == origreq )
 863                                         lp = lp->lr_child;
 864                                 else
 865                                         lp = lr->lr_refnext;
 866                         }
 867                         if ( looped ) {
 868                                 ldap_free_urllist( srv );
 869                                 srv = NULL;
 870                                 ld->ld_errno = LDAP_CLIENT_LOOP;
 871                                 rc = -1;
 872                                 continue;
 873                         }
 874
 875                         if( lc->lconn_rebind_inprogress) {
 876                                 /* We are already chasing a referral or search reference and a
 877                                  * bind on that connection is in progress.  We must queue
 878                                  * referrals on that connection, so we don't get a request
 879                                  * going out before the bind operation completes. This happens
 880                                  * if two search references come in one behind the other
 881                                  * for the same server with different contexts.
 882                                  */
 883                                 Debug( LDAP_DEBUG_TRACE,
 884                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
 885                                         refarray[i], 0, 0);
 886                                 if( lc->lconn_rebind_queue == NULL ) {
 887                                         /* Create a referral list */
 888                                         lc->lconn_rebind_queue =
 889                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
 890
 891                                         if( lc->lconn_rebind_queue == NULL) {
 892                                                 ld->ld_errno = LDAP_NO_MEMORY;
 893                                                 rc = -1;
 894                                                 goto done;
 895                                         }
 896
 897                                         lc->lconn_rebind_queue[0] = refarray;
 898                                         lc->lconn_rebind_queue[1] = NULL;
 899                                         refarray = NULL;
 900
 901                                 } else {
 902                                         /* Count how many referral arrays we already have */
 903                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 904                                                 /* empty */;
 905                                         }
 906
 907                                         /* Add the new referral to the list */
 908                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
 909                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
 910
 911                                         if( lc->lconn_rebind_queue == NULL ) {
 912                                                 ld->ld_errno = LDAP_NO_MEMORY;
 913                                                 rc = -1;
 914                                                 goto done;
 915                                         }
 916                                         lc->lconn_rebind_queue[j] = refarray;
 917                                         lc->lconn_rebind_queue[j+1] = NULL;
 918                                         refarray = NULL;
 919                                 }
 920
 921                                 /* We have queued the referral/reference, now just return */
 922                                 rc = 0;
 923                                 *hadrefp = 1;
 924                                 count = 1; /* Pretend we already followed referral */
 925                                 goto done;
 926                         }
 927                 }
 928                 /* Re-encode the request with the new starting point of the search.
 929                  * Note: In the future we also need to replace the filter if one
 930                  * was provided with the search reference
 931                  */
 932
 933                 /* For references we don't want old dn if new dn empty */
 934                 if ( sref && srv->lud_dn == NULL ) {
 935                         srv->lud_dn = LDAP_STRDUP( "" );
 936                 }
 937
 938                 LDAP_NEXT_MSGID( ld, id );
 939                 ber = re_encode_request( ld, origreq->lr_ber, id,
 940                         sref, srv, &rinfo.ri_request );
 941
 942                 if( ber == NULL ) {
 943                         ld->ld_errno = LDAP_ENCODING_ERROR;
 944                         rc = -1;
 945                         goto done;
 946                 }
 947
 948                 Debug( LDAP_DEBUG_TRACE,
 949                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
 950                         lr->lr_msgid, refarray[i], 0);
 951
 952                 /* Send the new request to the server - may require a bind */
 953                 rinfo.ri_msgid = origreq->lr_origid;
 954                 rinfo.ri_url = refarray[i];
 955 #ifdef LDAP_R_COMPILE
 956                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 957 #endif
 958                 rc = ldap_send_server_request( ld, ber, id,
 959                         origreq, srv, NULL, &rinfo );
 960 #ifdef LDAP_R_COMPILE
 961                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 962 #endif
 963                 if ( rc < 0 ) {
 964                         /* Failure, try next referral in the list */
 965                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
 966                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
 967                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
 968                         ldap_free_urllist( srv );
 969                         srv = NULL;
 970                         ld->ld_errno = LDAP_REFERRAL;
 971                 } else {
 972                         /* Success, no need to try this referral list further */
 973                         rc = 0;
 974                         ++count;
 975                         *hadrefp = 1;
 976
 977                         /* check if there is a queue of referrals that came in during bind */
 978                         if ( lc == NULL) {
 979                                 lc = find_connection( ld, srv, 1 );
 980                                 if ( lc == NULL ) {
 981                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
 982                                         rc = -1;
 983                                         goto done;
 984                                 }
 985                         }
 986
 987                         if ( lc->lconn_rebind_queue != NULL ) {
 988                                 /* Release resources of previous list */
 989                                 LDAP_VFREE( refarray );
 990                                 refarray = NULL;
 991                                 ldap_free_urllist( srv );
 992                                 srv = NULL;
 993
 994                                 /* Pull entries off end of queue so list always null terminated */
 995                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
 996                                         ;
 997                                 refarray = lc->lconn_rebind_queue[j - 1];
 998                                 lc->lconn_rebind_queue[j-1] = NULL;
 999                                 /* we pulled off last entry from queue, free queue */
1000                                 if ( j == 1 ) {
1001                                         LDAP_FREE( lc->lconn_rebind_queue );
1002                                         lc->lconn_rebind_queue = NULL;
1003                                 }
1004                                 /* restart the loop the with new referral list */
1005                                 i = -1;
1006                                 continue;
1007                         }
1008                         break; /* referral followed, break out of for loop */
1009                 }
1010         } /* end for loop */
1011 done:
1012         LDAP_VFREE( refarray );
1013         ldap_free_urllist( srv );
1014         LDAP_FREE( *errstrp );
1015
1016         if( rc == 0 ) {
1017                 *errstrp = NULL;
1018                 LDAP_FREE( unfollowed );
1019                 return count;
1020         } else {
1021                 *errstrp = unfollowed;
1022                 return rc;
1023         }
1024 }
1025
1026 /*
1027  * XXX merging of errors in this routine needs to be improved
1028  */
1029 int
1030 ldap_chase_referrals( LDAP *ld,
1031         LDAPRequest *lr,
1032         char **errstrp,
1033         int sref,
1034         int *hadrefp )
1035 {
1036         int             rc, count, id;
1037         unsigned        len;
1038         char            *p, *ref, *unfollowed;
1039         LDAPRequest     *origreq;
1040         LDAPURLDesc     *srv;
1041         BerElement      *ber;
1042         LDAPreqinfo  rinfo;
1043         LDAPConn        *lc;
1044
1045         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1046
1047         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1048         *hadrefp = 0;
1049
1050         if ( *errstrp == NULL ) {
1051                 return( 0 );
1052         }
1053
1054         len = strlen( *errstrp );
1055         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1056                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1057                         *p = '\0';
1058                         p += LDAP_REF_STR_LEN;
1059                         break;
1060                 }
1061         }
1062
1063         if ( len < LDAP_REF_STR_LEN ) {
1064                 return( 0 );
1065         }
1066
1067         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1068                 Debug( LDAP_DEBUG_ANY,
1069                     "more than %d referral hops (dropping)\n",
1070                     ld->ld_refhoplimit, 0, 0 );
1071                     /* XXX report as error in ld->ld_errno? */
1072                     return( 0 );
1073         }
1074
1075         /* find original request */
1076         for ( origreq = lr; origreq->lr_parent != NULL;
1077              origreq = origreq->lr_parent ) {
1078                 /* empty */;
1079         }
1080
1081         unfollowed = NULL;
1082         rc = count = 0;
1083
1084         /* parse out & follow referrals */
1085         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1086                 p = strchr( ref, '\n' );
1087                 if ( p != NULL ) {
1088                         *p++ = '\0';
1089                 }
1090
1091                 rc = ldap_url_parse_ext( ref, &srv );
1092
1093                 if ( rc != LDAP_URL_SUCCESS ) {
1094                         Debug( LDAP_DEBUG_TRACE,
1095                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
1096                         rc = ldap_append_referral( ld, &unfollowed, ref );
1097                         *hadrefp = 1;
1098                         continue;
1099                 }
1100
1101                 if ( srv->lud_dn != NULL && srv->lud_dn == '\0' ) {
1102                         LDAP_FREE( srv->lud_dn );
1103                         srv->lud_dn = NULL;
1104                 }
1105
1106                 Debug( LDAP_DEBUG_TRACE,
1107                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1108
1109                 *hadrefp = 1;
1110
1111                 /* See if we've already been here */
1112                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1113                         LDAPRequest *lp;
1114                         int looped = 0;
1115                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1116                         for (lp = lr; lp; lp = lp->lr_parent ) {
1117                                 if ( lp->lr_conn == lc ) {
1118                                         if ( len == lp->lr_dn.bv_len ) {
1119                                                 if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val,
1120                                                         len ))
1121                                                         continue;
1122                                                 looped = 1;
1123                                                 break;
1124                                         }
1125                                 }
1126                         }
1127                         if ( looped ) {
1128                                 ldap_free_urllist(srv);
1129                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1130                                 rc = -1;
1131                                 continue;
1132                         }
1133                 }
1134
1135                 LDAP_NEXT_MSGID( ld, id );
1136                 ber = re_encode_request( ld, origreq->lr_ber,
1137                     id, sref, srv, &rinfo.ri_request );
1138
1139                 if ( ber == NULL ) {
1140                         return -1 ;
1141                 }
1142
1143                 /* copy the complete referral for rebind process */
1144                 rinfo.ri_url = LDAP_STRDUP( ref );
1145
1146                 rinfo.ri_msgid = origreq->lr_origid;
1147
1148 #ifdef LDAP_R_COMPILE
1149                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1150 #endif
1151                 rc = ldap_send_server_request( ld, ber, id,
1152                         lr, srv, NULL, &rinfo );
1153 #ifdef LDAP_R_COMPILE
1154                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1155 #endif
1156
1157                 LDAP_FREE( rinfo.ri_url );
1158
1159                 if( rc >= 0 ) {
1160                         ++count;
1161                 } else {
1162                         Debug( LDAP_DEBUG_ANY,
1163                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1164                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1165                         rc = ldap_append_referral( ld, &unfollowed, ref );
1166                 }
1167
1168                 ldap_free_urllist(srv);
1169         }
1170
1171         LDAP_FREE( *errstrp );
1172         *errstrp = unfollowed;
1173
1174         return(( rc == 0 ) ? count : rc );
1175 }
1176
1177
1178 int
1179 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1180 {
1181         int     first;
1182
1183         if ( *referralsp == NULL ) {
1184                 first = 1;
1185                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1186                     + 1 );
1187         } else {
1188                 first = 0;
1189                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1190                     strlen( *referralsp ) + strlen( s ) + 2 );
1191         }
1192
1193         if ( *referralsp == NULL ) {
1194                 ld->ld_errno = LDAP_NO_MEMORY;
1195                 return( -1 );
1196         }
1197
1198         if ( first ) {
1199                 strcpy( *referralsp, LDAP_REF_STR );
1200         } else {
1201                 strcat( *referralsp, "\n" );
1202         }
1203         strcat( *referralsp, s );
1204
1205         return( 0 );
1206 }
1207
1208
1209
1210 static BerElement *
1211 re_encode_request( LDAP *ld,
1212         BerElement *origber,
1213         ber_int_t msgid,
1214         int sref,
1215         LDAPURLDesc *srv,
1216         int *type )
1217 {
1218         /*
1219          * XXX this routine knows way too much about how the lber library works!
1220          */
1221         ber_int_t       along;
1222         ber_tag_t       tag;
1223         ber_tag_t       rtag;
1224         ber_int_t       ver;
1225         ber_int_t       scope;
1226         int             rc;
1227         BerElement      tmpber, *ber;
1228         struct berval           orig_dn;
1229         char            *dn;
1230
1231         Debug( LDAP_DEBUG_TRACE,
1232             "re_encode_request: new msgid %ld, new dn <%s>\n",
1233             (long) msgid,
1234                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1235
1236         tmpber = *origber;
1237
1238         /*
1239          * all LDAP requests are sequences that start with a message id.
1240          * For all except delete, this is followed by a sequence that is
1241          * tagged with the operation code.  For delete, the provided DN
1242          * is not wrapped by a sequence.
1243          */
1244         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1245
1246         if ( rtag == LBER_ERROR ) {
1247                 ld->ld_errno = LDAP_DECODING_ERROR;
1248                 return( NULL );
1249         }
1250
1251         assert( tag != 0);
1252         if ( tag == LDAP_REQ_BIND ) {
1253                 /* bind requests have a version number before the DN & other stuff */
1254                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &orig_dn );
1255
1256         } else if ( tag == LDAP_REQ_DELETE ) {
1257                 /* delete requests don't have a DN wrapping sequence */
1258                 rtag = ber_scanf( &tmpber, "m", &orig_dn );
1259
1260         } else if ( tag == LDAP_REQ_SEARCH ) {
1261                 /* search requests need to be re-scope-ed */
1262                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &orig_dn, &scope );
1263
1264                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1265                         /* use the scope provided in reference */
1266                         scope = srv->lud_scope;
1267
1268                 } else if ( sref ) {
1269                         /* use scope implied by previous operation
1270                          *   base -> base
1271                          *   one -> base
1272                          *   subtree -> subtree
1273                          *   subordinate -> subtree
1274                          */
1275                         switch( scope ) {
1276                         default:
1277                         case LDAP_SCOPE_BASE:
1278                         case LDAP_SCOPE_ONELEVEL:
1279                                 scope = LDAP_SCOPE_BASE;
1280                                 break;
1281                         case LDAP_SCOPE_SUBTREE:
1282 #ifdef LDAP_SCOPE_SUBORDINATE
1283                         case LDAP_SCOPE_SUBORDINATE:
1284 #endif
1285                                 scope = LDAP_SCOPE_SUBTREE;
1286                                 break;
1287                         }
1288                 }
1289
1290         } else {
1291                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &orig_dn );
1292         }
1293
1294         if( rtag == LBER_ERROR ) {
1295                 ld->ld_errno = LDAP_DECODING_ERROR;
1296                 return NULL;
1297         }
1298
1299         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1300                 return NULL;
1301         }
1302
1303         if ( srv->lud_dn == NULL ) {
1304                 dn = orig_dn.bv_val;
1305         } else {
1306                 dn = srv->lud_dn;
1307         }
1308
1309         if ( tag == LDAP_REQ_BIND ) {
1310                 rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, dn );
1311         } else if ( tag == LDAP_REQ_DELETE ) {
1312                 rc = ber_printf( ber, "{itsN}", msgid, tag, dn );
1313         } else if ( tag == LDAP_REQ_SEARCH ) {
1314                 rc = ber_printf( ber, "{it{se" /*}}*/, msgid, tag, dn, scope );
1315         } else {
1316                 rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, dn );
1317         }
1318
1319         if ( rc == -1 ) {
1320                 ld->ld_errno = LDAP_ENCODING_ERROR;
1321                 ber_free( ber, 1 );
1322                 return NULL;
1323         }
1324
1325         if ( tag != LDAP_REQ_DELETE && (
1326                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1327                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1328             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1329         {
1330                 ld->ld_errno = LDAP_ENCODING_ERROR;
1331                 ber_free( ber, 1 );
1332                 return NULL;
1333         }
1334
1335 #ifdef LDAP_DEBUG
1336         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1337                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1338                     0, 0, 0 );
1339                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1340         }
1341 #endif /* LDAP_DEBUG */
1342
1343         *type = tag;    /* return request type */
1344         return ber;
1345 }
1346
1347
1348 LDAPRequest *
1349 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1350 {
1351         LDAPRequest     *lr;
1352
1353 #ifdef LDAP_R_COMPILE
1354         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1355 #endif
1356         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1357                 if( lr->lr_status == LDAP_REQST_COMPLETED ) {
1358                         continue;       /* Skip completed requests */
1359                 }
1360                 if ( msgid == lr->lr_msgid ) {
1361                         break;
1362                 }
1363         }
1364 #ifdef LDAP_R_COMPILE
1365         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1366 #endif
1367
1368         return( lr );
1369 }
1370
1371