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 1998-2007 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         ber = ber_alloc_t( ld->ld_lberoptions );
  74         if ( ber == NULL ) {
  75                 ld->ld_errno = LDAP_NO_MEMORY;
  76         }
  77
  78         return( ber );
  79 }
  80
  81
  82 void
  83 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  84 {
  85         ber->ber_options = ld->ld_lberoptions;
  86 }
  87
  88
  89 ber_int_t
  90 ldap_send_initial_request(
  91         LDAP *ld,
  92         ber_tag_t msgtype,
  93         const char *dn,
  94         BerElement *ber,
  95         ber_int_t msgid)
  96 {
  97         int rc = 1;
  98
  99         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
 100
 101 #ifdef LDAP_R_COMPILE
 102         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 103 #endif
 104         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
 105                 /* not connected yet */
 106                 rc = ldap_open_defconn( ld );
 107
 108         }
 109 #ifdef LDAP_R_COMPILE
 110         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 111 #endif
 112         if( rc < 0 ) {
 113                 ber_free( ber, 1 );
 114                 return( -1 );
 115         } else if ( rc == 0 ) {
 116                 Debug( LDAP_DEBUG_TRACE,
 117                         "ldap_open_defconn: successful\n",
 118                         0, 0, 0 );
 119         }
 120
 121 #ifdef LDAP_CONNECTIONLESS
 122         if (LDAP_IS_UDP(ld)) {
 123                 if (msgtype == LDAP_REQ_BIND) {
 124                         if (ld->ld_options.ldo_cldapdn)
 125                                 ldap_memfree(ld->ld_options.ldo_cldapdn);
 126                         ld->ld_options.ldo_cldapdn = ldap_strdup(dn);
 127                         return 0;
 128                 }
 129                 if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
 130                         return LDAP_PARAM_ERROR;
 131         }
 132 #endif
 133 #ifdef LDAP_R_COMPILE
 134         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 135 #endif
 136         rc = ldap_send_server_request( ld, ber, msgid, NULL,
 137                 NULL, NULL, NULL );
 138 #ifdef LDAP_R_COMPILE
 139         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 140 #endif
 141         return(rc);
 142 }
 143
 144
 145 int
 146 ldap_int_flush_request(
 147         LDAP *ld,
 148         LDAPRequest *lr )
 149 {
 150         LDAPConn *lc = lr->lr_conn;
 151
 152         if ( ber_flush2( lc->lconn_sb, lr->lr_ber, LBER_FLUSH_FREE_NEVER ) != 0 ) {
 153                 if ( sock_errno() == EAGAIN ) {
 154                         /* need to continue write later */
 155                         lr->lr_status = LDAP_REQST_WRITING;
 156                         ldap_mark_select_write( ld, lc->lconn_sb );
 157                         ld->ld_errno = LDAP_BUSY;
 158                         return -2;
 159                 } else {
 160                         ld->ld_errno = LDAP_SERVER_DOWN;
 161                         ldap_free_request( ld, lr );
 162                         ldap_free_connection( ld, lc, 0, 0 );
 163                         return( -1 );
 164                 }
 165         } else {
 166                 if ( lr->lr_parent == NULL ) {
 167                         lr->lr_ber->ber_end = lr->lr_ber->ber_ptr;
 168                         lr->lr_ber->ber_ptr = lr->lr_ber->ber_buf;
 169                 }
 170                 lr->lr_status = LDAP_REQST_INPROGRESS;
 171
 172                 /* sent -- waiting for a response */
 173                 ldap_mark_select_read( ld, lc->lconn_sb );
 174         }
 175         return 0;
 176 }
 177
 178 int
 179 ldap_send_server_request(
 180         LDAP *ld,
 181         BerElement *ber,
 182         ber_int_t msgid,
 183         LDAPRequest *parentreq,
 184         LDAPURLDesc **srvlist,
 185         LDAPConn *lc,
 186         LDAPreqinfo *bind )
 187 {
 188         LDAPRequest     *lr;
 189         int             incparent, rc;
 190
 191         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 192
 193         incparent = 0;
 194         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 195
 196         if ( lc == NULL ) {
 197                 if ( srvlist == NULL ) {
 198                         lc = ld->ld_defconn;
 199                 } else {
 200                         lc = find_connection( ld, *srvlist, 1 );
 201                         if ( lc == NULL ) {
 202                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 203                                         /* Remember the bind in the parent */
 204                                         incparent = 1;
 205                                         ++parentreq->lr_outrefcnt;
 206                                 }
 207                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 208                         }
 209                 }
 210         }
 211
 212         /* async connect... */
 213         if ( lc != NULL && lc->lconn_status == LDAP_CONNST_CONNECTING ) {
 214                 ber_socket_t    sd = AC_SOCKET_ERROR;
 215                 struct timeval  tv = { 0 };
 216
 217                 ber_sockbuf_ctrl( lc->lconn_sb, LBER_SB_OPT_GET_FD, &sd );
 218
 219                 /* poll ... */
 220                 switch ( ldap_int_poll( ld, sd, &tv ) ) {
 221                 case 0:
 222                         /* go on! */
 223                         lc->lconn_status = LDAP_CONNST_CONNECTED;
 224                         break;
 225
 226                 case -2:
 227                         /* async only occurs if a network timeout is set */
 228
 229                         /* honor network timeout */
 230                         if ( time( NULL ) - lc->lconn_created <= ld->ld_options.ldo_tm_net.tv_sec )
 231                         {
 232                                 /* caller will have to call again */
 233                                 ld->ld_errno = LDAP_X_CONNECTING;
 234                         }
 235                         /* fallthru */
 236
 237                 default:
 238                         /* error */
 239                         break;
 240                 }
 241         }
 242
 243         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 244                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 245                         ld->ld_errno = LDAP_SERVER_DOWN;
 246                 }
 247
 248                 ber_free( ber, 1 );
 249                 if ( incparent ) {
 250                         /* Forget about the bind */
 251                         --parentreq->lr_outrefcnt;
 252                 }
 253                 return( -1 );
 254         }
 255
 256         use_connection( ld, lc );
 257
 258         /* If we still have an incomplete write, try to finish it before
 259          * dealing with the new request. If we don't finish here, return
 260          * LDAP_BUSY and let the caller retry later. We only allow a single
 261          * request to be in WRITING state.
 262          */
 263         rc = 0;
 264         if ( ld->ld_requests &&
 265                 ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
 266                 ldap_int_flush_request( ld, ld->ld_requests ) < 0 )
 267         {
 268                 rc = -1;
 269         }
 270         if ( rc ) return rc;
 271
 272         lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ) );
 273         if ( lr == NULL ) {
 274                 ld->ld_errno = LDAP_NO_MEMORY;
 275                 ldap_free_connection( ld, lc, 0, 0 );
 276                 ber_free( ber, 1 );
 277                 if ( incparent ) {
 278                         /* Forget about the bind */
 279                         --parentreq->lr_outrefcnt;
 280                 }
 281                 return( -1 );
 282         }
 283         lr->lr_msgid = msgid;
 284         lr->lr_status = LDAP_REQST_INPROGRESS;
 285         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 286         lr->lr_ber = ber;
 287         lr->lr_conn = lc;
 288         if ( parentreq != NULL ) {      /* sub-request */
 289                 if ( !incparent ) {
 290                         /* Increment if we didn't do it before the bind */
 291                         ++parentreq->lr_outrefcnt;
 292                 }
 293                 lr->lr_origid = parentreq->lr_origid;
 294                 lr->lr_parentcnt = ++parentreq->lr_parentcnt;
 295                 lr->lr_parent = parentreq;
 296                 lr->lr_refnext = parentreq->lr_child;
 297                 parentreq->lr_child = lr;
 298         } else {                        /* original request */
 299                 lr->lr_origid = lr->lr_msgid;
 300         }
 301
 302         /* Extract requestDN for future reference */
 303         {
 304                 BerElement tmpber = *ber;
 305                 ber_int_t       bint;
 306                 ber_tag_t       tag, rtag;
 307
 308                 ber_reset( &tmpber, 1 );
 309                 rtag = ber_scanf( &tmpber, "{it", /*}*/ &bint, &tag );
 310                 switch ( tag ) {
 311                 case LDAP_REQ_BIND:
 312                         rtag = ber_scanf( &tmpber, "{i" /*}*/, &bint );
 313                         break;
 314                 case LDAP_REQ_DELETE:
 315                         break;
 316                 default:
 317                         rtag = ber_scanf( &tmpber, "{" /*}*/ );
 318                 case LDAP_REQ_ABANDON:
 319                         break;
 320                 }
 321                 if ( tag != LDAP_REQ_ABANDON ) {
 322                         ber_skip_tag( &tmpber, &lr->lr_dn.bv_len );
 323                         lr->lr_dn.bv_val = tmpber.ber_ptr;
 324                 }
 325         }
 326
 327         lr->lr_prev = NULL;
 328         lr->lr_next = ld->ld_requests;
 329         if ( lr->lr_next != NULL ) {
 330                 lr->lr_next->lr_prev = lr;
 331         }
 332         ld->ld_requests = lr;
 333
 334         ld->ld_errno = LDAP_SUCCESS;
 335         if ( ldap_int_flush_request( ld, lr ) == -1 ) {
 336                 msgid = -1;
 337         }
 338
 339         return( msgid );
 340 }
 341
 342 LDAPConn *
 343 ldap_new_connection( LDAP *ld, LDAPURLDesc **srvlist, int use_ldsb,
 344         int connect, LDAPreqinfo *bind )
 345 {
 346         LDAPConn        *lc;
 347         int             async = 0;
 348
 349         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection %d %d %d\n",
 350                 use_ldsb, connect, (bind != NULL) );
 351         /*
 352          * make a new LDAP server connection
 353          * XXX open connection synchronously for now
 354          */
 355         lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ) );
 356         if ( lc == NULL ) {
 357                 ld->ld_errno = LDAP_NO_MEMORY;
 358                 return( NULL );
 359         }
 360
 361         if ( use_ldsb ) {
 362                 assert( ld->ld_sb != NULL );
 363                 lc->lconn_sb = ld->ld_sb;
 364
 365         } else {
 366                 lc->lconn_sb = ber_sockbuf_alloc();
 367                 if ( lc->lconn_sb == NULL ) {
 368                         LDAP_FREE( (char *)lc );
 369                         ld->ld_errno = LDAP_NO_MEMORY;
 370                         return( NULL );
 371                 }
 372         }
 373
 374         if ( connect ) {
 375                 LDAPURLDesc     **srvp, *srv = NULL;
 376
 377                 async = LDAP_BOOL_GET( &ld->ld_options, LDAP_BOOL_CONNECT_ASYNC );
 378
 379                 for ( srvp = srvlist; *srvp != NULL; srvp = &(*srvp)->lud_next ) {
 380                         int             rc;
 381
 382                         rc = ldap_int_open_connection( ld, lc, *srvp, async );
 383                         if ( rc != -1 ) {
 384                                 srv = *srvp;
 385
 386                                 if ( ld->ld_urllist_proc && ( !async || rc != -2 ) ) {
 387                                         ld->ld_urllist_proc( ld, srvlist, srvp, ld->ld_urllist_params );
 388                                 }
 389
 390                                 break;
 391                         }
 392                 }
 393
 394                 if ( srv == NULL ) {
 395                         if ( !use_ldsb ) {
 396                                 ber_sockbuf_free( lc->lconn_sb );
 397                         }
 398                         LDAP_FREE( (char *)lc );
 399                         ld->ld_errno = LDAP_SERVER_DOWN;
 400                         return( NULL );
 401                 }
 402
 403                 lc->lconn_server = ldap_url_dup( srv );
 404         }
 405
 406         lc->lconn_status = async ? LDAP_CONNST_CONNECTING : LDAP_CONNST_CONNECTED;
 407 #ifdef LDAP_R_COMPILE
 408         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 409 #endif
 410         lc->lconn_next = ld->ld_conns;
 411         ld->ld_conns = lc;
 412 #ifdef LDAP_R_COMPILE
 413         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 414 #endif
 415
 416         if ( bind != NULL ) {
 417                 int             err = 0;
 418                 LDAPConn        *savedefconn;
 419
 420                 /* Set flag to prevent additional referrals
 421                  * from being processed on this
 422                  * connection until the bind has completed
 423                  */
 424                 lc->lconn_rebind_inprogress = 1;
 425                 /* V3 rebind function */
 426                 if ( ld->ld_rebind_proc != NULL) {
 427                         LDAPURLDesc     *srvfunc;
 428
 429                         srvfunc = ldap_url_dup( *srvlist );
 430                         if ( srvfunc == NULL ) {
 431                                 ld->ld_errno = LDAP_NO_MEMORY;
 432                                 err = -1;
 433                         } else {
 434                                 savedefconn = ld->ld_defconn;
 435                                 ++lc->lconn_refcnt;     /* avoid premature free */
 436                                 ld->ld_defconn = lc;
 437
 438                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 439 #ifdef LDAP_R_COMPILE
 440                                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 441                                 ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 442 #endif
 443                                 err = (*ld->ld_rebind_proc)( ld,
 444                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 445                                         ld->ld_rebind_params );
 446 #ifdef LDAP_R_COMPILE
 447                                 ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 448                                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 449 #endif
 450
 451                                 ld->ld_defconn = savedefconn;
 452                                 --lc->lconn_refcnt;
 453
 454                                 if ( err != 0 ) {
 455                                         err = -1;
 456                                         ldap_free_connection( ld, lc, 1, 0 );
 457                                         lc = NULL;
 458                                 }
 459                                 ldap_free_urldesc( srvfunc );
 460                         }
 461
 462                 } else {
 463                         int             msgid, rc;
 464                         struct berval   passwd = BER_BVNULL;
 465
 466                         savedefconn = ld->ld_defconn;
 467                         ++lc->lconn_refcnt;     /* avoid premature free */
 468                         ld->ld_defconn = lc;
 469
 470                         Debug( LDAP_DEBUG_TRACE,
 471                                 "anonymous rebind via ldap_sasl_bind(\"\")\n",
 472                                 0, 0, 0);
 473
 474 #ifdef LDAP_R_COMPILE
 475                         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 476                         ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 477 #endif
 478                         rc = ldap_sasl_bind( ld, "", LDAP_SASL_SIMPLE, &passwd,
 479                                 NULL, NULL, &msgid );
 480                         if ( rc != LDAP_SUCCESS ) {
 481                                 err = -1;
 482
 483                         } else {
 484                                 for ( err = 1; err > 0; ) {
 485                                         struct timeval  tv = { 0, 100000 };
 486                                         LDAPMessage     *res = NULL;
 487
 488                                         switch ( ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res ) ) {
 489                                         case -1:
 490                                                 err = -1;
 491                                                 break;
 492
 493                                         case 0:
 494 #ifdef LDAP_R_COMPILE
 495                                                 ldap_pvt_thread_yield();
 496 #endif
 497                                                 break;
 498
 499                                         case LDAP_RES_BIND:
 500                                                 rc = ldap_parse_result( ld, res, &err, NULL, NULL, NULL, NULL, 1 );
 501                                                 if ( rc != LDAP_SUCCESS ) {
 502                                                         err = -1;
 503
 504                                                 } else if ( err != LDAP_SUCCESS ) {
 505                                                         err = -1;
 506                                                 }
 507                                                 /* else err == LDAP_SUCCESS == 0 */
 508                                                 break;
 509
 510                                         default:
 511                                                 Debug( LDAP_DEBUG_TRACE,
 512                                                         "ldap_new_connection %p: "
 513                                                         "unexpected response %d "
 514                                                         "from BIND request id=%d\n",
 515                                                         ld, ldap_msgtype( res ), msgid );
 516                                                 err = -1;
 517                                                 break;
 518                                         }
 519                                 }
 520                         }
 521 #ifdef LDAP_R_COMPILE
 522                         ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 523                         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 524 #endif
 525                         ld->ld_defconn = savedefconn;
 526                         --lc->lconn_refcnt;
 527
 528                         if ( err != 0 ) {
 529                                 ldap_free_connection( ld, lc, 1, 0 );
 530                                 lc = NULL;
 531                         }
 532                 }
 533                 if ( lc != NULL )
 534                         lc->lconn_rebind_inprogress = 0;
 535         }
 536
 537         return( lc );
 538 }
 539
 540
 541 static LDAPConn *
 542 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 543 /*
 544  * return an existing connection (if any) to the server srv
 545  * if "any" is non-zero, check for any server in the "srv" chain
 546  */
 547 {
 548         LDAPConn        *lc;
 549         LDAPURLDesc     *lcu, *lsu;
 550         int lcu_port, lsu_port;
 551         int found = 0;
 552
 553 #ifdef LDAP_R_COMPILE
 554         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 555 #endif
 556         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 557                 lcu = lc->lconn_server;
 558                 lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
 559                         lcu->lud_port );
 560
 561                 for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
 562                         lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
 563                                 lsu->lud_port );
 564
 565                         if ( lsu_port == lcu_port
 566                                 && strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
 567                                 && lcu->lud_host != NULL && *lcu->lud_host != '\0'
 568                                 && lsu->lud_host != NULL && *lsu->lud_host != '\0'
 569                                 && strcasecmp( lsu->lud_host, lcu->lud_host ) == 0 )
 570                         {
 571                                 found = 1;
 572                                 break;
 573                         }
 574
 575                         if ( !any ) break;
 576                 }
 577                 if ( found )
 578                         break;
 579         }
 580 #ifdef LDAP_R_COMPILE
 581         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 582 #endif
 583         return lc;
 584 }
 585
 586
 587
 588 static void
 589 use_connection( LDAP *ld, LDAPConn *lc )
 590 {
 591         ++lc->lconn_refcnt;
 592         lc->lconn_lastused = time( NULL );
 593 }
 594
 595
 596 void
 597 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 598 {
 599         LDAPConn        *tmplc, *prevlc;
 600
 601         Debug( LDAP_DEBUG_TRACE,
 602                 "ldap_free_connection %d %d\n",
 603                 force, unbind, 0 );
 604
 605         if ( force || --lc->lconn_refcnt <= 0 ) {
 606                 /* remove from connections list first */
 607 #ifdef LDAP_R_COMPILE
 608                 ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 609 #endif
 610
 611                 for ( prevlc = NULL, tmplc = ld->ld_conns;
 612                         tmplc != NULL;
 613                         tmplc = tmplc->lconn_next )
 614                 {
 615                         if ( tmplc == lc ) {
 616                                 if ( prevlc == NULL ) {
 617                                     ld->ld_conns = tmplc->lconn_next;
 618                                 } else {
 619                                     prevlc->lconn_next = tmplc->lconn_next;
 620                                 }
 621                                 break;
 622                         }
 623                         prevlc = tmplc;
 624                 }
 625 #ifdef LDAP_R_COMPILE
 626                 ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 627 #endif
 628
 629                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 630                         ldap_mark_select_clear( ld, lc->lconn_sb );
 631                         if ( unbind ) {
 632                                 ldap_send_unbind( ld, lc->lconn_sb,
 633                                                 NULL, NULL );
 634                         }
 635                 }
 636
 637                 if ( lc->lconn_ber != NULL ) {
 638                         ber_free( lc->lconn_ber, 1 );
 639                 }
 640
 641                 ldap_int_sasl_close( ld, lc );
 642
 643                 ldap_free_urllist( lc->lconn_server );
 644
 645                 /* FIXME: is this at all possible?
 646                  * ldap_ld_free() in unbind.c calls ldap_free_connection()
 647                  * with force == 1 __after__ explicitly calling
 648                  * ldap_free_request() on all requests */
 649                 if ( force ) {
 650                         LDAPRequest     *lr;
 651
 652                         for ( lr = ld->ld_requests; lr; ) {
 653                                 LDAPRequest     *lr_next = lr->lr_next;
 654
 655                                 if ( lr->lr_conn == lc ) {
 656                                         ldap_free_request_int( ld, lr );
 657                                 }
 658
 659                                 lr = lr_next;
 660                         }
 661                 }
 662
 663                 if ( lc->lconn_sb != ld->ld_sb ) {
 664                         ber_sockbuf_free( lc->lconn_sb );
 665                 }
 666
 667                 if ( lc->lconn_rebind_queue != NULL) {
 668                         int i;
 669                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 670                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 671                         }
 672                         LDAP_FREE( lc->lconn_rebind_queue );
 673                 }
 674
 675                 LDAP_FREE( lc );
 676
 677                 Debug( LDAP_DEBUG_TRACE,
 678                         "ldap_free_connection: actually freed\n",
 679                         0, 0, 0 );
 680
 681         } else {
 682                 lc->lconn_lastused = time( NULL );
 683                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 684                                 lc->lconn_refcnt, 0, 0 );
 685         }
 686 }
 687
 688
 689 #ifdef LDAP_DEBUG
 690 void
 691 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 692 {
 693         LDAPConn        *lc;
 694         char            timebuf[32];
 695
 696         Debug( LDAP_DEBUG_TRACE, "** ld %p Connection%s:\n", (void *)ld, all ? "s" : "", 0 );
 697         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 698                 if ( lc->lconn_server != NULL ) {
 699                         Debug( LDAP_DEBUG_TRACE, "* host: %s  port: %d%s\n",
 700                                 ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 701                                 : lc->lconn_server->lud_host,
 702                                 lc->lconn_server->lud_port, ( lc->lconn_sb ==
 703                                 ld->ld_sb ) ? "  (default)" : "" );
 704                 }
 705                 Debug( LDAP_DEBUG_TRACE, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 706                         ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET )
 707                                 ? "NeedSocket" :
 708                                 ( lc->lconn_status == LDAP_CONNST_CONNECTING )
 709                                         ? "Connecting" : "Connected", 0 );
 710                 Debug( LDAP_DEBUG_TRACE, "  last used: %s%s\n",
 711                         ldap_pvt_ctime( &lc->lconn_lastused, timebuf ),
 712                         lc->lconn_rebind_inprogress ? "  rebind in progress" : "", 0 );
 713                 if ( lc->lconn_rebind_inprogress ) {
 714                         if ( lc->lconn_rebind_queue != NULL) {
 715                                 int     i;
 716
 717                                 for ( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 718                                         int     j;
 719                                         for( j = 0; lc->lconn_rebind_queue[i][j] != 0; j++ ) {
 720                                                 Debug( LDAP_DEBUG_TRACE, "    queue %d entry %d - %s\n",
 721                                                         i, j, lc->lconn_rebind_queue[i][j] );
 722                                         }
 723                                 }
 724                         } else {
 725                                 Debug( LDAP_DEBUG_TRACE, "    queue is empty\n", 0, 0, 0 );
 726                         }
 727                 }
 728                 Debug( LDAP_DEBUG_TRACE, "\n", 0, 0, 0 );
 729                 if ( !all ) {
 730                         break;
 731                 }
 732         }
 733 }
 734
 735
 736 void
 737 ldap_dump_requests_and_responses( LDAP *ld )
 738 {
 739         LDAPRequest     *lr;
 740         LDAPMessage     *lm, *l;
 741         int             i;
 742
 743         Debug( LDAP_DEBUG_TRACE, "** ld %p Outstanding Requests:\n",
 744                 (void *)ld, 0, 0 );
 745         lr = ld->ld_requests;
 746         if ( lr == NULL ) {
 747                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 748         }
 749         for ( i = 0; lr != NULL; lr = lr->lr_next, i++ ) {
 750                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  origid %d, status %s\n",
 751                         lr->lr_msgid, lr->lr_origid,
 752                         ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 753                         ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 754                         ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 755                         ( lr->lr_status == LDAP_REQST_WRITING ) ? "Writing" :
 756                         ( lr->lr_status == LDAP_REQST_COMPLETED ) ? "RequestCompleted"
 757                                 : "InvalidStatus" );
 758                 Debug( LDAP_DEBUG_TRACE, "   outstanding referrals %d, parent count %d\n",
 759                         lr->lr_outrefcnt, lr->lr_parentcnt, 0 );
 760         }
 761         Debug( LDAP_DEBUG_TRACE, "  ld %p request count %d (abandoned %lu)\n",
 762                 (void *)ld, i, ld->ld_nabandoned );
 763         Debug( LDAP_DEBUG_TRACE, "** ld %p Response Queue:\n", (void *)ld, 0, 0 );
 764         if ( ( lm = ld->ld_responses ) == NULL ) {
 765                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 766         }
 767         for ( i = 0; lm != NULL; lm = lm->lm_next, i++ ) {
 768                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  type %lu\n",
 769                     lm->lm_msgid, (unsigned long)lm->lm_msgtype, 0 );
 770                 if ( lm->lm_chain != NULL ) {
 771                         Debug( LDAP_DEBUG_TRACE, "   chained responses:\n", 0, 0, 0 );
 772                         for ( l = lm->lm_chain; l != NULL; l = l->lm_chain ) {
 773                                 Debug( LDAP_DEBUG_TRACE,
 774                                         "  * msgid %d,  type %lu\n",
 775                                         l->lm_msgid,
 776                                         (unsigned long)l->lm_msgtype, 0 );
 777                         }
 778                 }
 779         }
 780         Debug( LDAP_DEBUG_TRACE, "  ld %p response count %d\n", (void *)ld, i, 0 );
 781 }
 782 #endif /* LDAP_DEBUG */
 783
 784 static void
 785 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 786 {
 787         /* if lr_refcnt > 0, the request has been looked up
 788          * by ldap_find_request_by_msgid(); if in the meanwhile
 789          * the request is free()'d by someone else, just decrease
 790          * the reference count and extract it from the request
 791          * list; later on, it will be freed. */
 792         if ( lr->lr_prev == NULL ) {
 793                 if ( lr->lr_refcnt == 0 ) {
 794                         /* free'ing the first request? */
 795                         assert( ld->ld_requests == lr );
 796                 }
 797
 798                 if ( ld->ld_requests == lr ) {
 799                         ld->ld_requests = lr->lr_next;
 800                 }
 801
 802         } else {
 803                 lr->lr_prev->lr_next = lr->lr_next;
 804         }
 805
 806         if ( lr->lr_next != NULL ) {
 807                 lr->lr_next->lr_prev = lr->lr_prev;
 808         }
 809
 810         if ( lr->lr_refcnt > 0 ) {
 811                 lr->lr_refcnt = -lr->lr_refcnt;
 812
 813                 lr->lr_prev = NULL;
 814                 lr->lr_next = NULL;
 815
 816                 return;
 817         }
 818
 819         if ( lr->lr_ber != NULL ) {
 820                 ber_free( lr->lr_ber, 1 );
 821                 lr->lr_ber = NULL;
 822         }
 823
 824         if ( lr->lr_res_error != NULL ) {
 825                 LDAP_FREE( lr->lr_res_error );
 826                 lr->lr_res_error = NULL;
 827         }
 828
 829         if ( lr->lr_res_matched != NULL ) {
 830                 LDAP_FREE( lr->lr_res_matched );
 831                 lr->lr_res_matched = NULL;
 832         }
 833
 834         LDAP_FREE( lr );
 835 }
 836
 837 void
 838 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 839 {
 840 #ifdef LDAP_R_COMPILE
 841         LDAP_PVT_THREAD_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 842 #endif
 843
 844         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 845                 lr->lr_origid, lr->lr_msgid, 0 );
 846
 847         /* free all referrals (child requests) */
 848         while ( lr->lr_child ) {
 849                 ldap_free_request( ld, lr->lr_child );
 850         }
 851
 852         if ( lr->lr_parent != NULL ) {
 853                 LDAPRequest     **lrp;
 854
 855                 --lr->lr_parent->lr_outrefcnt;
 856                 for ( lrp = &lr->lr_parent->lr_child;
 857                         *lrp && *lrp != lr;
 858                         lrp = &(*lrp)->lr_refnext );
 859
 860                 if ( *lrp == lr ) {
 861                         *lrp = lr->lr_refnext;
 862                 }
 863         }
 864         ldap_free_request_int( ld, lr );
 865 }
 866
 867 /*
 868  * call first time with *cntp = -1
 869  * when returns *cntp == -1, no referrals are left
 870  *
 871  * NOTE: may replace *refsp, or shuffle the contents
 872  * of the original array.
 873  */
 874 static int ldap_int_nextref(
 875         LDAP                    *ld,
 876         char                    ***refsp,
 877         int                     *cntp,
 878         void                    *params )
 879 {
 880         assert( refsp != NULL );
 881         assert( *refsp != NULL );
 882         assert( cntp != NULL );
 883
 884         if ( *cntp < -1 ) {
 885                 *cntp = -1;
 886                 return -1;
 887         }
 888
 889         (*cntp)++;
 890
 891         if ( (*refsp)[ *cntp ] == NULL ) {
 892                 *cntp = -1;
 893         }
 894
 895         return 0;
 896 }
 897
 898 /*
 899  * Chase v3 referrals
 900  *
 901  * Parameters:
 902  *  (IN) ld = LDAP connection handle
 903  *  (IN) lr = LDAP Request structure
 904  *  (IN) refs = array of pointers to referral strings that we will chase
 905  *              The array will be free'd by this function when no longer needed
 906  *  (IN) sref != 0 if following search reference
 907  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 908  *  (OUT) hadrefp = 1 if sucessfully followed referral
 909  *
 910  * Return value - number of referrals followed
 911  */
 912 int
 913 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 914 {
 915         char            *unfollowed;
 916         int              unfollowedcnt = 0;
 917         LDAPRequest     *origreq;
 918         LDAPURLDesc     *srv = NULL;
 919         BerElement      *ber;
 920         char            **refarray = NULL;
 921         LDAPConn        *lc;
 922         int                      rc, count, i, j, id;
 923         LDAPreqinfo  rinfo;
 924
 925         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 926         *hadrefp = 0;
 927
 928         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 929
 930         unfollowed = NULL;
 931         rc = count = 0;
 932
 933         /* If no referrals in array, return */
 934         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 935                 rc = 0;
 936                 goto done;
 937         }
 938
 939         /* Check for hop limit exceeded */
 940         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 941                 Debug( LDAP_DEBUG_ANY,
 942                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 943                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 944                 rc = -1;
 945                 goto done;
 946         }
 947
 948         /* find original request */
 949         for ( origreq = lr;
 950                 origreq->lr_parent != NULL;
 951                 origreq = origreq->lr_parent )
 952         {
 953                 /* empty */ ;
 954         }
 955
 956         refarray = refs;
 957         refs = NULL;
 958
 959         if ( ld->ld_nextref_proc == NULL ) {
 960                 ld->ld_nextref_proc = ldap_int_nextref;
 961         }
 962
 963         /* parse out & follow referrals */
 964         i = -1;
 965         for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
 966                         i != -1;
 967                         ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
 968         {
 969
 970                 /* Parse the referral URL */
 971                 rc = ldap_url_parse_ext( refarray[i], &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
 972                 if ( rc != LDAP_URL_SUCCESS ) {
 973                         /* ldap_url_parse_ext() returns LDAP_URL_* errors
 974                          * which do not map on API errors */
 975                         ld->ld_errno = LDAP_PARAM_ERROR;
 976                         rc = -1;
 977                         goto done;
 978                 }
 979
 980                 if( srv->lud_crit_exts ) {
 981                         /* we do not support any extensions */
 982                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 983                         rc = -1;
 984                         goto done;
 985                 }
 986
 987                 /* check connection for re-bind in progress */
 988                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 989                         /* See if we've already requested this DN with this conn */
 990                         LDAPRequest *lp;
 991                         int looped = 0;
 992                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
 993                         for ( lp = origreq; lp; ) {
 994                                 if ( lp->lr_conn == lc
 995                                         && len == lp->lr_dn.bv_len
 996                                         && len
 997                                         && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) == 0 )
 998                                 {
 999                                         looped = 1;
1000                                         break;
1001                                 }
1002                                 if ( lp == origreq ) {
1003                                         lp = lp->lr_child;
1004                                 } else {
1005                                         lp = lr->lr_refnext;
1006                                 }
1007                         }
1008                         if ( looped ) {
1009                                 ldap_free_urllist( srv );
1010                                 srv = NULL;
1011                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1012                                 rc = -1;
1013                                 continue;
1014                         }
1015
1016                         if ( lc->lconn_rebind_inprogress ) {
1017                                 /* We are already chasing a referral or search reference and a
1018                                  * bind on that connection is in progress.  We must queue
1019                                  * referrals on that connection, so we don't get a request
1020                                  * going out before the bind operation completes. This happens
1021                                  * if two search references come in one behind the other
1022                                  * for the same server with different contexts.
1023                                  */
1024                                 Debug( LDAP_DEBUG_TRACE,
1025                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
1026                                         refarray[i], 0, 0);
1027                                 if( lc->lconn_rebind_queue == NULL ) {
1028                                         /* Create a referral list */
1029                                         lc->lconn_rebind_queue =
1030                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
1031
1032                                         if( lc->lconn_rebind_queue == NULL) {
1033                                                 ld->ld_errno = LDAP_NO_MEMORY;
1034                                                 rc = -1;
1035                                                 goto done;
1036                                         }
1037
1038                                         lc->lconn_rebind_queue[0] = refarray;
1039                                         lc->lconn_rebind_queue[1] = NULL;
1040                                         refarray = NULL;
1041
1042                                 } else {
1043                                         /* Count how many referral arrays we already have */
1044                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
1045                                                 /* empty */;
1046                                         }
1047
1048                                         /* Add the new referral to the list */
1049                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
1050                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
1051
1052                                         if( lc->lconn_rebind_queue == NULL ) {
1053                                                 ld->ld_errno = LDAP_NO_MEMORY;
1054                                                 rc = -1;
1055                                                 goto done;
1056                                         }
1057                                         lc->lconn_rebind_queue[j] = refarray;
1058                                         lc->lconn_rebind_queue[j+1] = NULL;
1059                                         refarray = NULL;
1060                                 }
1061
1062                                 /* We have queued the referral/reference, now just return */
1063                                 rc = 0;
1064                                 *hadrefp = 1;
1065                                 count = 1; /* Pretend we already followed referral */
1066                                 goto done;
1067                         }
1068                 }
1069                 /* Re-encode the request with the new starting point of the search.
1070                  * Note: In the future we also need to replace the filter if one
1071                  * was provided with the search reference
1072                  */
1073
1074                 /* For references we don't want old dn if new dn empty */
1075                 if ( sref && srv->lud_dn == NULL ) {
1076                         srv->lud_dn = LDAP_STRDUP( "" );
1077                 }
1078
1079                 LDAP_NEXT_MSGID( ld, id );
1080                 ber = re_encode_request( ld, origreq->lr_ber, id,
1081                         sref, srv, &rinfo.ri_request );
1082
1083                 if( ber == NULL ) {
1084                         ld->ld_errno = LDAP_ENCODING_ERROR;
1085                         rc = -1;
1086                         goto done;
1087                 }
1088
1089                 Debug( LDAP_DEBUG_TRACE,
1090                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
1091                         lr->lr_msgid, refarray[i], 0);
1092
1093                 /* Send the new request to the server - may require a bind */
1094                 rinfo.ri_msgid = origreq->lr_origid;
1095                 rinfo.ri_url = refarray[i];
1096 #ifdef LDAP_R_COMPILE
1097                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1098 #endif
1099                 rc = ldap_send_server_request( ld, ber, id,
1100                         origreq, &srv, NULL, &rinfo );
1101 #ifdef LDAP_R_COMPILE
1102                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1103 #endif
1104                 if ( rc < 0 ) {
1105                         /* Failure, try next referral in the list */
1106                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
1107                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1108                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
1109                         ldap_free_urllist( srv );
1110                         srv = NULL;
1111                         ld->ld_errno = LDAP_REFERRAL;
1112                 } else {
1113                         /* Success, no need to try this referral list further */
1114                         rc = 0;
1115                         ++count;
1116                         *hadrefp = 1;
1117
1118                         /* check if there is a queue of referrals that came in during bind */
1119                         if ( lc == NULL) {
1120                                 lc = find_connection( ld, srv, 1 );
1121                                 if ( lc == NULL ) {
1122                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
1123                                         rc = -1;
1124                                         goto done;
1125                                 }
1126                         }
1127
1128                         if ( lc->lconn_rebind_queue != NULL ) {
1129                                 /* Release resources of previous list */
1130                                 LDAP_VFREE( refarray );
1131                                 refarray = NULL;
1132                                 ldap_free_urllist( srv );
1133                                 srv = NULL;
1134
1135                                 /* Pull entries off end of queue so list always null terminated */
1136                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
1137                                         ;
1138                                 refarray = lc->lconn_rebind_queue[j - 1];
1139                                 lc->lconn_rebind_queue[j-1] = NULL;
1140                                 /* we pulled off last entry from queue, free queue */
1141                                 if ( j == 1 ) {
1142                                         LDAP_FREE( lc->lconn_rebind_queue );
1143                                         lc->lconn_rebind_queue = NULL;
1144                                 }
1145                                 /* restart the loop the with new referral list */
1146                                 i = -1;
1147                                 continue;
1148                         }
1149                         break; /* referral followed, break out of for loop */
1150                 }
1151         } /* end for loop */
1152 done:
1153         LDAP_VFREE( refarray );
1154         ldap_free_urllist( srv );
1155         LDAP_FREE( *errstrp );
1156
1157         if( rc == 0 ) {
1158                 *errstrp = NULL;
1159                 LDAP_FREE( unfollowed );
1160                 return count;
1161         } else {
1162                 *errstrp = unfollowed;
1163                 return rc;
1164         }
1165 }
1166
1167 /*
1168  * XXX merging of errors in this routine needs to be improved
1169  */
1170 int
1171 ldap_chase_referrals( LDAP *ld,
1172         LDAPRequest *lr,
1173         char **errstrp,
1174         int sref,
1175         int *hadrefp )
1176 {
1177         int             rc, count, id;
1178         unsigned        len;
1179         char            *p, *ref, *unfollowed;
1180         LDAPRequest     *origreq;
1181         LDAPURLDesc     *srv;
1182         BerElement      *ber;
1183         LDAPreqinfo  rinfo;
1184         LDAPConn        *lc;
1185
1186         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1187
1188         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1189         *hadrefp = 0;
1190
1191         if ( *errstrp == NULL ) {
1192                 return( 0 );
1193         }
1194
1195         len = strlen( *errstrp );
1196         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1197                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1198                         *p = '\0';
1199                         p += LDAP_REF_STR_LEN;
1200                         break;
1201                 }
1202         }
1203
1204         if ( len < LDAP_REF_STR_LEN ) {
1205                 return( 0 );
1206         }
1207
1208         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1209                 Debug( LDAP_DEBUG_ANY,
1210                     "more than %d referral hops (dropping)\n",
1211                     ld->ld_refhoplimit, 0, 0 );
1212                     /* XXX report as error in ld->ld_errno? */
1213                     return( 0 );
1214         }
1215
1216         /* find original request */
1217         for ( origreq = lr; origreq->lr_parent != NULL;
1218              origreq = origreq->lr_parent ) {
1219                 /* empty */;
1220         }
1221
1222         unfollowed = NULL;
1223         rc = count = 0;
1224
1225         /* parse out & follow referrals */
1226         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1227                 p = strchr( ref, '\n' );
1228                 if ( p != NULL ) {
1229                         *p++ = '\0';
1230                 }
1231
1232                 rc = ldap_url_parse_ext( ref, &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1233                 if ( rc != LDAP_URL_SUCCESS ) {
1234                         Debug( LDAP_DEBUG_TRACE,
1235                                 "ignoring %s referral <%s>\n",
1236                                 ref, rc == LDAP_URL_ERR_BADSCHEME ? "unknown" : "incorrect", 0 );
1237                         rc = ldap_append_referral( ld, &unfollowed, ref );
1238                         *hadrefp = 1;
1239                         continue;
1240                 }
1241
1242                 Debug( LDAP_DEBUG_TRACE,
1243                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1244
1245                 *hadrefp = 1;
1246
1247                 /* See if we've already been here */
1248                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1249                         LDAPRequest *lp;
1250                         int looped = 0;
1251                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1252                         for ( lp = lr; lp; lp = lp->lr_parent ) {
1253                                 if ( lp->lr_conn == lc
1254                                         && len == lp->lr_dn.bv_len )
1255                                 {
1256                                         if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) )
1257                                                         continue;
1258                                         looped = 1;
1259                                         break;
1260                                 }
1261                         }
1262                         if ( looped ) {
1263                                 ldap_free_urllist( srv );
1264                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1265                                 rc = -1;
1266                                 continue;
1267                         }
1268                 }
1269
1270                 LDAP_NEXT_MSGID( ld, id );
1271                 ber = re_encode_request( ld, origreq->lr_ber,
1272                     id, sref, srv, &rinfo.ri_request );
1273
1274                 if ( ber == NULL ) {
1275                         return -1 ;
1276                 }
1277
1278                 /* copy the complete referral for rebind process */
1279                 rinfo.ri_url = LDAP_STRDUP( ref );
1280
1281                 rinfo.ri_msgid = origreq->lr_origid;
1282
1283 #ifdef LDAP_R_COMPILE
1284                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1285 #endif
1286                 rc = ldap_send_server_request( ld, ber, id,
1287                         lr, &srv, NULL, &rinfo );
1288 #ifdef LDAP_R_COMPILE
1289                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1290 #endif
1291
1292                 LDAP_FREE( rinfo.ri_url );
1293
1294                 if( rc >= 0 ) {
1295                         ++count;
1296                 } else {
1297                         Debug( LDAP_DEBUG_ANY,
1298                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1299                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1300                         rc = ldap_append_referral( ld, &unfollowed, ref );
1301                 }
1302
1303                 ldap_free_urllist(srv);
1304         }
1305
1306         LDAP_FREE( *errstrp );
1307         *errstrp = unfollowed;
1308
1309         return(( rc == 0 ) ? count : rc );
1310 }
1311
1312
1313 int
1314 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1315 {
1316         int     first;
1317
1318         if ( *referralsp == NULL ) {
1319                 first = 1;
1320                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1321                     + 1 );
1322         } else {
1323                 first = 0;
1324                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1325                     strlen( *referralsp ) + strlen( s ) + 2 );
1326         }
1327
1328         if ( *referralsp == NULL ) {
1329                 ld->ld_errno = LDAP_NO_MEMORY;
1330                 return( -1 );
1331         }
1332
1333         if ( first ) {
1334                 strcpy( *referralsp, LDAP_REF_STR );
1335         } else {
1336                 strcat( *referralsp, "\n" );
1337         }
1338         strcat( *referralsp, s );
1339
1340         return( 0 );
1341 }
1342
1343
1344
1345 static BerElement *
1346 re_encode_request( LDAP *ld,
1347         BerElement *origber,
1348         ber_int_t msgid,
1349         int sref,
1350         LDAPURLDesc *srv,
1351         int *type )
1352 {
1353         /*
1354          * XXX this routine knows way too much about how the lber library works!
1355          */
1356         ber_int_t       along;
1357         ber_tag_t       tag;
1358         ber_tag_t       rtag;
1359         ber_int_t       ver;
1360         ber_int_t       scope;
1361         int             rc;
1362         BerElement      tmpber, *ber;
1363         struct berval           dn;
1364
1365         Debug( LDAP_DEBUG_TRACE,
1366             "re_encode_request: new msgid %ld, new dn <%s>\n",
1367             (long) msgid,
1368                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1369
1370         tmpber = *origber;
1371
1372         /*
1373          * all LDAP requests are sequences that start with a message id.
1374          * For all except delete, this is followed by a sequence that is
1375          * tagged with the operation code.  For delete, the provided DN
1376          * is not wrapped by a sequence.
1377          */
1378         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1379
1380         if ( rtag == LBER_ERROR ) {
1381                 ld->ld_errno = LDAP_DECODING_ERROR;
1382                 return( NULL );
1383         }
1384
1385         assert( tag != 0);
1386         if ( tag == LDAP_REQ_BIND ) {
1387                 /* bind requests have a version number before the DN & other stuff */
1388                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &dn );
1389
1390         } else if ( tag == LDAP_REQ_DELETE ) {
1391                 /* delete requests don't have a DN wrapping sequence */
1392                 rtag = ber_scanf( &tmpber, "m", &dn );
1393
1394         } else if ( tag == LDAP_REQ_SEARCH ) {
1395                 /* search requests need to be re-scope-ed */
1396                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &dn, &scope );
1397
1398                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1399                         /* use the scope provided in reference */
1400                         scope = srv->lud_scope;
1401
1402                 } else if ( sref ) {
1403                         /* use scope implied by previous operation
1404                          *   base -> base
1405                          *   one -> base
1406                          *   subtree -> subtree
1407                          *   subordinate -> subtree
1408                          */
1409                         switch( scope ) {
1410                         default:
1411                         case LDAP_SCOPE_BASE:
1412                         case LDAP_SCOPE_ONELEVEL:
1413                                 scope = LDAP_SCOPE_BASE;
1414                                 break;
1415                         case LDAP_SCOPE_SUBTREE:
1416                         case LDAP_SCOPE_SUBORDINATE:
1417                                 scope = LDAP_SCOPE_SUBTREE;
1418                                 break;
1419                         }
1420                 }
1421
1422         } else {
1423                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &dn );
1424         }
1425
1426         if( rtag == LBER_ERROR ) {
1427                 ld->ld_errno = LDAP_DECODING_ERROR;
1428                 return NULL;
1429         }
1430
1431         /* restore character zero'd out by ber_scanf*/
1432         dn.bv_val[dn.bv_len] = tmpber.ber_tag;
1433
1434         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1435                 return NULL;
1436         }
1437
1438         if ( srv->lud_dn ) {
1439                 ber_str2bv( srv->lud_dn, 0, 0, &dn );
1440         }
1441
1442         if ( tag == LDAP_REQ_BIND ) {
1443                 rc = ber_printf( ber, "{it{iO" /*}}*/, msgid, tag, ver, &dn );
1444         } else if ( tag == LDAP_REQ_DELETE ) {
1445                 rc = ber_printf( ber, "{itON}", msgid, tag, &dn );
1446         } else if ( tag == LDAP_REQ_SEARCH ) {
1447                 rc = ber_printf( ber, "{it{Oe" /*}}*/, msgid, tag, &dn, scope );
1448         } else {
1449                 rc = ber_printf( ber, "{it{O" /*}}*/, msgid, tag, &dn );
1450         }
1451
1452         if ( rc == -1 ) {
1453                 ld->ld_errno = LDAP_ENCODING_ERROR;
1454                 ber_free( ber, 1 );
1455                 return NULL;
1456         }
1457
1458         if ( tag != LDAP_REQ_DELETE && (
1459                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1460                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1461             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1462         {
1463                 ld->ld_errno = LDAP_ENCODING_ERROR;
1464                 ber_free( ber, 1 );
1465                 return NULL;
1466         }
1467
1468 #ifdef LDAP_DEBUG
1469         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1470                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1471                     0, 0, 0 );
1472                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1473         }
1474 #endif /* LDAP_DEBUG */
1475
1476         *type = tag;    /* return request type */
1477         return ber;
1478 }
1479
1480
1481 LDAPRequest *
1482 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1483 {
1484         LDAPRequest     *lr;
1485
1486 #ifdef LDAP_R_COMPILE
1487         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1488 #endif
1489         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1490                 if ( lr->lr_status == LDAP_REQST_COMPLETED ) {
1491                         continue;       /* Skip completed requests */
1492                 }
1493                 if ( msgid == lr->lr_msgid ) {
1494                         lr->lr_refcnt++;
1495                         break;
1496                 }
1497         }
1498 #ifdef LDAP_R_COMPILE
1499         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1500 #endif
1501
1502         return( lr );
1503 }
1504
1505 void
1506 ldap_return_request( LDAP *ld, LDAPRequest *lrx, int freeit )
1507 {
1508         LDAPRequest     *lr;
1509
1510 #ifdef LDAP_R_COMPILE
1511         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1512 #endif
1513         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1514                 if ( lr == lrx ) {
1515                         if ( lr->lr_refcnt > 0 ) {
1516                                 lr->lr_refcnt--;
1517
1518                         } else if ( lr->lr_refcnt < 0 ) {
1519                                 lr->lr_refcnt++;
1520                                 if ( lr->lr_refcnt == 0 ) {
1521                                         lr = NULL;
1522                                 }
1523                         }
1524                         break;
1525                 }
1526         }
1527         if ( lr == NULL ) {
1528                 ldap_free_request_int( ld, lrx );
1529
1530         } else if ( freeit ) {
1531                 ldap_free_request( ld, lrx );
1532         }
1533 #ifdef LDAP_R_COMPILE
1534         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1535 #endif
1536 }