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 1998-2008 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 #ifdef LDAP_CONNECTIONLESS
 259         if ( LDAP_IS_UDP( ld )) {
 260                 BerElement tmpber = *ber;
 261                 ber_rewind( &tmpber );
 262                 rc = ber_write( &tmpber, ld->ld_options.ldo_peer,
 263                         sizeof( struct sockaddr ), 0 );
 264                 if ( rc == -1 ) {
 265                         ld->ld_errno = LDAP_ENCODING_ERROR;
 266                         return rc;
 267                 }
 268         }
 269 #endif
 270
 271         /* If we still have an incomplete write, try to finish it before
 272          * dealing with the new request. If we don't finish here, return
 273          * LDAP_BUSY and let the caller retry later. We only allow a single
 274          * request to be in WRITING state.
 275          */
 276         rc = 0;
 277         if ( ld->ld_requests &&
 278                 ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
 279                 ldap_int_flush_request( ld, ld->ld_requests ) < 0 )
 280         {
 281                 rc = -1;
 282         }
 283         if ( rc ) return rc;
 284
 285         lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ) );
 286         if ( lr == NULL ) {
 287                 ld->ld_errno = LDAP_NO_MEMORY;
 288                 ldap_free_connection( ld, lc, 0, 0 );
 289                 ber_free( ber, 1 );
 290                 if ( incparent ) {
 291                         /* Forget about the bind */
 292                         --parentreq->lr_outrefcnt;
 293                 }
 294                 return( -1 );
 295         }
 296         lr->lr_msgid = msgid;
 297         lr->lr_status = LDAP_REQST_INPROGRESS;
 298         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 299         lr->lr_ber = ber;
 300         lr->lr_conn = lc;
 301         if ( parentreq != NULL ) {      /* sub-request */
 302                 if ( !incparent ) {
 303                         /* Increment if we didn't do it before the bind */
 304                         ++parentreq->lr_outrefcnt;
 305                 }
 306                 lr->lr_origid = parentreq->lr_origid;
 307                 lr->lr_parentcnt = ++parentreq->lr_parentcnt;
 308                 lr->lr_parent = parentreq;
 309                 lr->lr_refnext = parentreq->lr_child;
 310                 parentreq->lr_child = lr;
 311         } else {                        /* original request */
 312                 lr->lr_origid = lr->lr_msgid;
 313         }
 314
 315         /* Extract requestDN for future reference */
 316         {
 317                 BerElement tmpber = *ber;
 318                 ber_int_t       bint;
 319                 ber_tag_t       tag, rtag;
 320
 321                 ber_reset( &tmpber, 1 );
 322                 rtag = ber_scanf( &tmpber, "{it", /*}*/ &bint, &tag );
 323                 switch ( tag ) {
 324                 case LDAP_REQ_BIND:
 325                         rtag = ber_scanf( &tmpber, "{i" /*}*/, &bint );
 326                         break;
 327                 case LDAP_REQ_DELETE:
 328                         break;
 329                 default:
 330                         rtag = ber_scanf( &tmpber, "{" /*}*/ );
 331                 case LDAP_REQ_ABANDON:
 332                         break;
 333                 }
 334                 if ( tag != LDAP_REQ_ABANDON ) {
 335                         ber_skip_tag( &tmpber, &lr->lr_dn.bv_len );
 336                         lr->lr_dn.bv_val = tmpber.ber_ptr;
 337                 }
 338         }
 339
 340         lr->lr_prev = NULL;
 341         lr->lr_next = ld->ld_requests;
 342         if ( lr->lr_next != NULL ) {
 343                 lr->lr_next->lr_prev = lr;
 344         }
 345         ld->ld_requests = lr;
 346
 347         ld->ld_errno = LDAP_SUCCESS;
 348         if ( ldap_int_flush_request( ld, lr ) == -1 ) {
 349                 msgid = -1;
 350         }
 351
 352         return( msgid );
 353 }
 354
 355 LDAPConn *
 356 ldap_new_connection( LDAP *ld, LDAPURLDesc **srvlist, int use_ldsb,
 357         int connect, LDAPreqinfo *bind )
 358 {
 359         LDAPConn        *lc;
 360         int             async = 0;
 361
 362         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection %d %d %d\n",
 363                 use_ldsb, connect, (bind != NULL) );
 364         /*
 365          * make a new LDAP server connection
 366          * XXX open connection synchronously for now
 367          */
 368         lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ) );
 369         if ( lc == NULL ) {
 370                 ld->ld_errno = LDAP_NO_MEMORY;
 371                 return( NULL );
 372         }
 373
 374         if ( use_ldsb ) {
 375                 assert( ld->ld_sb != NULL );
 376                 lc->lconn_sb = ld->ld_sb;
 377
 378         } else {
 379                 lc->lconn_sb = ber_sockbuf_alloc();
 380                 if ( lc->lconn_sb == NULL ) {
 381                         LDAP_FREE( (char *)lc );
 382                         ld->ld_errno = LDAP_NO_MEMORY;
 383                         return( NULL );
 384                 }
 385         }
 386
 387         if ( connect ) {
 388                 LDAPURLDesc     **srvp, *srv = NULL;
 389
 390                 async = LDAP_BOOL_GET( &ld->ld_options, LDAP_BOOL_CONNECT_ASYNC );
 391
 392                 for ( srvp = srvlist; *srvp != NULL; srvp = &(*srvp)->lud_next ) {
 393                         int             rc;
 394
 395                         rc = ldap_int_open_connection( ld, lc, *srvp, async );
 396                         if ( rc != -1 ) {
 397                                 srv = *srvp;
 398
 399                                 if ( ld->ld_urllist_proc && ( !async || rc != -2 ) ) {
 400                                         ld->ld_urllist_proc( ld, srvlist, srvp, ld->ld_urllist_params );
 401                                 }
 402
 403                                 break;
 404                         }
 405                 }
 406
 407                 if ( srv == NULL ) {
 408                         if ( !use_ldsb ) {
 409                                 ber_sockbuf_free( lc->lconn_sb );
 410                         }
 411                         LDAP_FREE( (char *)lc );
 412                         ld->ld_errno = LDAP_SERVER_DOWN;
 413                         return( NULL );
 414                 }
 415
 416                 lc->lconn_server = ldap_url_dup( srv );
 417         }
 418
 419         lc->lconn_status = async ? LDAP_CONNST_CONNECTING : LDAP_CONNST_CONNECTED;
 420 #ifdef LDAP_R_COMPILE
 421         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 422 #endif
 423         lc->lconn_next = ld->ld_conns;
 424         ld->ld_conns = lc;
 425 #ifdef LDAP_R_COMPILE
 426         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 427 #endif
 428
 429         if ( bind != NULL ) {
 430                 int             err = 0;
 431                 LDAPConn        *savedefconn;
 432
 433                 /* Set flag to prevent additional referrals
 434                  * from being processed on this
 435                  * connection until the bind has completed
 436                  */
 437                 lc->lconn_rebind_inprogress = 1;
 438                 /* V3 rebind function */
 439                 if ( ld->ld_rebind_proc != NULL) {
 440                         LDAPURLDesc     *srvfunc;
 441
 442                         srvfunc = ldap_url_dup( *srvlist );
 443                         if ( srvfunc == NULL ) {
 444                                 ld->ld_errno = LDAP_NO_MEMORY;
 445                                 err = -1;
 446                         } else {
 447                                 savedefconn = ld->ld_defconn;
 448                                 ++lc->lconn_refcnt;     /* avoid premature free */
 449                                 ld->ld_defconn = lc;
 450
 451                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 452 #ifdef LDAP_R_COMPILE
 453                                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 454                                 ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 455 #endif
 456                                 err = (*ld->ld_rebind_proc)( ld,
 457                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 458                                         ld->ld_rebind_params );
 459 #ifdef LDAP_R_COMPILE
 460                                 ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 461                                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 462 #endif
 463
 464                                 ld->ld_defconn = savedefconn;
 465                                 --lc->lconn_refcnt;
 466
 467                                 if ( err != 0 ) {
 468                                         err = -1;
 469                                         ldap_free_connection( ld, lc, 1, 0 );
 470                                         lc = NULL;
 471                                 }
 472                                 ldap_free_urldesc( srvfunc );
 473                         }
 474
 475                 } else {
 476                         int             msgid, rc;
 477                         struct berval   passwd = BER_BVNULL;
 478
 479                         savedefconn = ld->ld_defconn;
 480                         ++lc->lconn_refcnt;     /* avoid premature free */
 481                         ld->ld_defconn = lc;
 482
 483                         Debug( LDAP_DEBUG_TRACE,
 484                                 "anonymous rebind via ldap_sasl_bind(\"\")\n",
 485                                 0, 0, 0);
 486
 487 #ifdef LDAP_R_COMPILE
 488                         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
 489                         ldap_pvt_thread_mutex_unlock( &ld->ld_res_mutex );
 490 #endif
 491                         rc = ldap_sasl_bind( ld, "", LDAP_SASL_SIMPLE, &passwd,
 492                                 NULL, NULL, &msgid );
 493                         if ( rc != LDAP_SUCCESS ) {
 494                                 err = -1;
 495
 496                         } else {
 497                                 for ( err = 1; err > 0; ) {
 498                                         struct timeval  tv = { 0, 100000 };
 499                                         LDAPMessage     *res = NULL;
 500
 501                                         switch ( ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res ) ) {
 502                                         case -1:
 503                                                 err = -1;
 504                                                 break;
 505
 506                                         case 0:
 507 #ifdef LDAP_R_COMPILE
 508                                                 ldap_pvt_thread_yield();
 509 #endif
 510                                                 break;
 511
 512                                         case LDAP_RES_BIND:
 513                                                 rc = ldap_parse_result( ld, res, &err, NULL, NULL, NULL, NULL, 1 );
 514                                                 if ( rc != LDAP_SUCCESS ) {
 515                                                         err = -1;
 516
 517                                                 } else if ( err != LDAP_SUCCESS ) {
 518                                                         err = -1;
 519                                                 }
 520                                                 /* else err == LDAP_SUCCESS == 0 */
 521                                                 break;
 522
 523                                         default:
 524                                                 Debug( LDAP_DEBUG_TRACE,
 525                                                         "ldap_new_connection %p: "
 526                                                         "unexpected response %d "
 527                                                         "from BIND request id=%d\n",
 528                                                         (void *) ld, ldap_msgtype( res ), msgid );
 529                                                 err = -1;
 530                                                 break;
 531                                         }
 532                                 }
 533                         }
 534 #ifdef LDAP_R_COMPILE
 535                         ldap_pvt_thread_mutex_lock( &ld->ld_res_mutex );
 536                         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
 537 #endif
 538                         ld->ld_defconn = savedefconn;
 539                         --lc->lconn_refcnt;
 540
 541                         if ( err != 0 ) {
 542                                 ldap_free_connection( ld, lc, 1, 0 );
 543                                 lc = NULL;
 544                         }
 545                 }
 546                 if ( lc != NULL )
 547                         lc->lconn_rebind_inprogress = 0;
 548         }
 549
 550         return( lc );
 551 }
 552
 553
 554 static LDAPConn *
 555 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 556 /*
 557  * return an existing connection (if any) to the server srv
 558  * if "any" is non-zero, check for any server in the "srv" chain
 559  */
 560 {
 561         LDAPConn        *lc;
 562         LDAPURLDesc     *lcu, *lsu;
 563         int lcu_port, lsu_port;
 564         int found = 0;
 565
 566 #ifdef LDAP_R_COMPILE
 567         ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 568 #endif
 569         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 570                 lcu = lc->lconn_server;
 571                 lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
 572                         lcu->lud_port );
 573
 574                 for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
 575                         lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
 576                                 lsu->lud_port );
 577
 578                         if ( lsu_port == lcu_port
 579                                 && strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
 580                                 && lcu->lud_host != NULL && *lcu->lud_host != '\0'
 581                                 && lsu->lud_host != NULL && *lsu->lud_host != '\0'
 582                                 && strcasecmp( lsu->lud_host, lcu->lud_host ) == 0 )
 583                         {
 584                                 found = 1;
 585                                 break;
 586                         }
 587
 588                         if ( !any ) break;
 589                 }
 590                 if ( found )
 591                         break;
 592         }
 593 #ifdef LDAP_R_COMPILE
 594         ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 595 #endif
 596         return lc;
 597 }
 598
 599
 600
 601 static void
 602 use_connection( LDAP *ld, LDAPConn *lc )
 603 {
 604         ++lc->lconn_refcnt;
 605         lc->lconn_lastused = time( NULL );
 606 }
 607
 608
 609 void
 610 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 611 {
 612         LDAPConn        *tmplc, *prevlc;
 613
 614         Debug( LDAP_DEBUG_TRACE,
 615                 "ldap_free_connection %d %d\n",
 616                 force, unbind, 0 );
 617
 618         if ( force || --lc->lconn_refcnt <= 0 ) {
 619                 /* remove from connections list first */
 620 #ifdef LDAP_R_COMPILE
 621                 ldap_pvt_thread_mutex_lock( &ld->ld_conn_mutex );
 622 #endif
 623
 624                 for ( prevlc = NULL, tmplc = ld->ld_conns;
 625                         tmplc != NULL;
 626                         tmplc = tmplc->lconn_next )
 627                 {
 628                         if ( tmplc == lc ) {
 629                                 if ( prevlc == NULL ) {
 630                                     ld->ld_conns = tmplc->lconn_next;
 631                                 } else {
 632                                     prevlc->lconn_next = tmplc->lconn_next;
 633                                 }
 634                                 break;
 635                         }
 636                         prevlc = tmplc;
 637                 }
 638 #ifdef LDAP_R_COMPILE
 639                 ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 640 #endif
 641
 642                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 643                         ldap_mark_select_clear( ld, lc->lconn_sb );
 644                         if ( unbind ) {
 645                                 ldap_send_unbind( ld, lc->lconn_sb,
 646                                                 NULL, NULL );
 647                         }
 648                 }
 649
 650                 if ( lc->lconn_ber != NULL ) {
 651                         ber_free( lc->lconn_ber, 1 );
 652                 }
 653
 654                 ldap_int_sasl_close( ld, lc );
 655
 656                 ldap_free_urllist( lc->lconn_server );
 657
 658                 /* FIXME: is this at all possible?
 659                  * ldap_ld_free() in unbind.c calls ldap_free_connection()
 660                  * with force == 1 __after__ explicitly calling
 661                  * ldap_free_request() on all requests */
 662                 if ( force ) {
 663                         LDAPRequest     *lr;
 664
 665                         for ( lr = ld->ld_requests; lr; ) {
 666                                 LDAPRequest     *lr_next = lr->lr_next;
 667
 668                                 if ( lr->lr_conn == lc ) {
 669                                         ldap_free_request_int( ld, lr );
 670                                 }
 671
 672                                 lr = lr_next;
 673                         }
 674                 }
 675
 676                 if ( lc->lconn_sb != ld->ld_sb ) {
 677                         ber_sockbuf_free( lc->lconn_sb );
 678                 }
 679
 680                 if ( lc->lconn_rebind_queue != NULL) {
 681                         int i;
 682                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 683                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 684                         }
 685                         LDAP_FREE( lc->lconn_rebind_queue );
 686                 }
 687
 688                 LDAP_FREE( lc );
 689
 690                 Debug( LDAP_DEBUG_TRACE,
 691                         "ldap_free_connection: actually freed\n",
 692                         0, 0, 0 );
 693
 694         } else {
 695                 lc->lconn_lastused = time( NULL );
 696                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 697                                 lc->lconn_refcnt, 0, 0 );
 698         }
 699 }
 700
 701
 702 #ifdef LDAP_DEBUG
 703 void
 704 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 705 {
 706         LDAPConn        *lc;
 707         char            timebuf[32];
 708
 709         Debug( LDAP_DEBUG_TRACE, "** ld %p Connection%s:\n", (void *)ld, all ? "s" : "", 0 );
 710         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 711                 if ( lc->lconn_server != NULL ) {
 712                         Debug( LDAP_DEBUG_TRACE, "* host: %s  port: %d%s\n",
 713                                 ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 714                                 : lc->lconn_server->lud_host,
 715                                 lc->lconn_server->lud_port, ( lc->lconn_sb ==
 716                                 ld->ld_sb ) ? "  (default)" : "" );
 717                 }
 718                 Debug( LDAP_DEBUG_TRACE, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 719                         ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET )
 720                                 ? "NeedSocket" :
 721                                 ( lc->lconn_status == LDAP_CONNST_CONNECTING )
 722                                         ? "Connecting" : "Connected", 0 );
 723                 Debug( LDAP_DEBUG_TRACE, "  last used: %s%s\n",
 724                         ldap_pvt_ctime( &lc->lconn_lastused, timebuf ),
 725                         lc->lconn_rebind_inprogress ? "  rebind in progress" : "", 0 );
 726                 if ( lc->lconn_rebind_inprogress ) {
 727                         if ( lc->lconn_rebind_queue != NULL) {
 728                                 int     i;
 729
 730                                 for ( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 731                                         int     j;
 732                                         for( j = 0; lc->lconn_rebind_queue[i][j] != 0; j++ ) {
 733                                                 Debug( LDAP_DEBUG_TRACE, "    queue %d entry %d - %s\n",
 734                                                         i, j, lc->lconn_rebind_queue[i][j] );
 735                                         }
 736                                 }
 737                         } else {
 738                                 Debug( LDAP_DEBUG_TRACE, "    queue is empty\n", 0, 0, 0 );
 739                         }
 740                 }
 741                 Debug( LDAP_DEBUG_TRACE, "\n", 0, 0, 0 );
 742                 if ( !all ) {
 743                         break;
 744                 }
 745         }
 746 }
 747
 748
 749 void
 750 ldap_dump_requests_and_responses( LDAP *ld )
 751 {
 752         LDAPRequest     *lr;
 753         LDAPMessage     *lm, *l;
 754         int             i;
 755
 756         Debug( LDAP_DEBUG_TRACE, "** ld %p Outstanding Requests:\n",
 757                 (void *)ld, 0, 0 );
 758         lr = ld->ld_requests;
 759         if ( lr == NULL ) {
 760                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 761         }
 762         for ( i = 0; lr != NULL; lr = lr->lr_next, i++ ) {
 763                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  origid %d, status %s\n",
 764                         lr->lr_msgid, lr->lr_origid,
 765                         ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 766                         ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 767                         ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 768                         ( lr->lr_status == LDAP_REQST_WRITING ) ? "Writing" :
 769                         ( lr->lr_status == LDAP_REQST_COMPLETED ) ? "RequestCompleted"
 770                                 : "InvalidStatus" );
 771                 Debug( LDAP_DEBUG_TRACE, "   outstanding referrals %d, parent count %d\n",
 772                         lr->lr_outrefcnt, lr->lr_parentcnt, 0 );
 773         }
 774         Debug( LDAP_DEBUG_TRACE, "  ld %p request count %d (abandoned %lu)\n",
 775                 (void *)ld, i, ld->ld_nabandoned );
 776         Debug( LDAP_DEBUG_TRACE, "** ld %p Response Queue:\n", (void *)ld, 0, 0 );
 777         if ( ( lm = ld->ld_responses ) == NULL ) {
 778                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 779         }
 780         for ( i = 0; lm != NULL; lm = lm->lm_next, i++ ) {
 781                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  type %lu\n",
 782                     lm->lm_msgid, (unsigned long)lm->lm_msgtype, 0 );
 783                 if ( lm->lm_chain != NULL ) {
 784                         Debug( LDAP_DEBUG_TRACE, "   chained responses:\n", 0, 0, 0 );
 785                         for ( l = lm->lm_chain; l != NULL; l = l->lm_chain ) {
 786                                 Debug( LDAP_DEBUG_TRACE,
 787                                         "  * msgid %d,  type %lu\n",
 788                                         l->lm_msgid,
 789                                         (unsigned long)l->lm_msgtype, 0 );
 790                         }
 791                 }
 792         }
 793         Debug( LDAP_DEBUG_TRACE, "  ld %p response count %d\n", (void *)ld, i, 0 );
 794 }
 795 #endif /* LDAP_DEBUG */
 796
 797 static void
 798 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 799 {
 800         /* if lr_refcnt > 0, the request has been looked up
 801          * by ldap_find_request_by_msgid(); if in the meanwhile
 802          * the request is free()'d by someone else, just decrease
 803          * the reference count and extract it from the request
 804          * list; later on, it will be freed. */
 805         if ( lr->lr_prev == NULL ) {
 806                 if ( lr->lr_refcnt == 0 ) {
 807                         /* free'ing the first request? */
 808                         assert( ld->ld_requests == lr );
 809                 }
 810
 811                 if ( ld->ld_requests == lr ) {
 812                         ld->ld_requests = lr->lr_next;
 813                 }
 814
 815         } else {
 816                 lr->lr_prev->lr_next = lr->lr_next;
 817         }
 818
 819         if ( lr->lr_next != NULL ) {
 820                 lr->lr_next->lr_prev = lr->lr_prev;
 821         }
 822
 823         if ( lr->lr_refcnt > 0 ) {
 824                 lr->lr_refcnt = -lr->lr_refcnt;
 825
 826                 lr->lr_prev = NULL;
 827                 lr->lr_next = NULL;
 828
 829                 return;
 830         }
 831
 832         if ( lr->lr_ber != NULL ) {
 833                 ber_free( lr->lr_ber, 1 );
 834                 lr->lr_ber = NULL;
 835         }
 836
 837         if ( lr->lr_res_error != NULL ) {
 838                 LDAP_FREE( lr->lr_res_error );
 839                 lr->lr_res_error = NULL;
 840         }
 841
 842         if ( lr->lr_res_matched != NULL ) {
 843                 LDAP_FREE( lr->lr_res_matched );
 844                 lr->lr_res_matched = NULL;
 845         }
 846
 847         LDAP_FREE( lr );
 848 }
 849
 850 void
 851 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 852 {
 853 #ifdef LDAP_R_COMPILE
 854         LDAP_PVT_THREAD_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 855 #endif
 856
 857         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 858                 lr->lr_origid, lr->lr_msgid, 0 );
 859
 860         /* free all referrals (child requests) */
 861         while ( lr->lr_child ) {
 862                 ldap_free_request( ld, lr->lr_child );
 863         }
 864
 865         if ( lr->lr_parent != NULL ) {
 866                 LDAPRequest     **lrp;
 867
 868                 --lr->lr_parent->lr_outrefcnt;
 869                 for ( lrp = &lr->lr_parent->lr_child;
 870                         *lrp && *lrp != lr;
 871                         lrp = &(*lrp)->lr_refnext );
 872
 873                 if ( *lrp == lr ) {
 874                         *lrp = lr->lr_refnext;
 875                 }
 876         }
 877         ldap_free_request_int( ld, lr );
 878 }
 879
 880 /*
 881  * call first time with *cntp = -1
 882  * when returns *cntp == -1, no referrals are left
 883  *
 884  * NOTE: may replace *refsp, or shuffle the contents
 885  * of the original array.
 886  */
 887 static int ldap_int_nextref(
 888         LDAP                    *ld,
 889         char                    ***refsp,
 890         int                     *cntp,
 891         void                    *params )
 892 {
 893         assert( refsp != NULL );
 894         assert( *refsp != NULL );
 895         assert( cntp != NULL );
 896
 897         if ( *cntp < -1 ) {
 898                 *cntp = -1;
 899                 return -1;
 900         }
 901
 902         (*cntp)++;
 903
 904         if ( (*refsp)[ *cntp ] == NULL ) {
 905                 *cntp = -1;
 906         }
 907
 908         return 0;
 909 }
 910
 911 /*
 912  * Chase v3 referrals
 913  *
 914  * Parameters:
 915  *  (IN) ld = LDAP connection handle
 916  *  (IN) lr = LDAP Request structure
 917  *  (IN) refs = array of pointers to referral strings that we will chase
 918  *              The array will be free'd by this function when no longer needed
 919  *  (IN) sref != 0 if following search reference
 920  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 921  *  (OUT) hadrefp = 1 if sucessfully followed referral
 922  *
 923  * Return value - number of referrals followed
 924  */
 925 int
 926 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 927 {
 928         char            *unfollowed;
 929         int              unfollowedcnt = 0;
 930         LDAPRequest     *origreq;
 931         LDAPURLDesc     *srv = NULL;
 932         BerElement      *ber;
 933         char            **refarray = NULL;
 934         LDAPConn        *lc;
 935         int                      rc, count, i, j, id;
 936         LDAPreqinfo  rinfo;
 937
 938         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 939         *hadrefp = 0;
 940
 941         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 942
 943         unfollowed = NULL;
 944         rc = count = 0;
 945
 946         /* If no referrals in array, return */
 947         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 948                 rc = 0;
 949                 goto done;
 950         }
 951
 952         /* Check for hop limit exceeded */
 953         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 954                 Debug( LDAP_DEBUG_ANY,
 955                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 956                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 957                 rc = -1;
 958                 goto done;
 959         }
 960
 961         /* find original request */
 962         for ( origreq = lr;
 963                 origreq->lr_parent != NULL;
 964                 origreq = origreq->lr_parent )
 965         {
 966                 /* empty */ ;
 967         }
 968
 969         refarray = refs;
 970         refs = NULL;
 971
 972         if ( ld->ld_nextref_proc == NULL ) {
 973                 ld->ld_nextref_proc = ldap_int_nextref;
 974         }
 975
 976         /* parse out & follow referrals */
 977         i = -1;
 978         for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
 979                         i != -1;
 980                         ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
 981         {
 982
 983                 /* Parse the referral URL */
 984                 rc = ldap_url_parse_ext( refarray[i], &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
 985                 if ( rc != LDAP_URL_SUCCESS ) {
 986                         /* ldap_url_parse_ext() returns LDAP_URL_* errors
 987                          * which do not map on API errors */
 988                         ld->ld_errno = LDAP_PARAM_ERROR;
 989                         rc = -1;
 990                         goto done;
 991                 }
 992
 993                 if( srv->lud_crit_exts ) {
 994                         /* we do not support any extensions */
 995                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 996                         rc = -1;
 997                         goto done;
 998                 }
 999
1000                 /* check connection for re-bind in progress */
1001                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1002                         /* See if we've already requested this DN with this conn */
1003                         LDAPRequest *lp;
1004                         int looped = 0;
1005                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1006                         for ( lp = origreq; lp; ) {
1007                                 if ( lp->lr_conn == lc
1008                                         && len == lp->lr_dn.bv_len
1009                                         && len
1010                                         && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) == 0 )
1011                                 {
1012                                         looped = 1;
1013                                         break;
1014                                 }
1015                                 if ( lp == origreq ) {
1016                                         lp = lp->lr_child;
1017                                 } else {
1018                                         lp = lp->lr_refnext;
1019                                 }
1020                         }
1021                         if ( looped ) {
1022                                 ldap_free_urllist( srv );
1023                                 srv = NULL;
1024                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1025                                 rc = -1;
1026                                 continue;
1027                         }
1028
1029                         if ( lc->lconn_rebind_inprogress ) {
1030                                 /* We are already chasing a referral or search reference and a
1031                                  * bind on that connection is in progress.  We must queue
1032                                  * referrals on that connection, so we don't get a request
1033                                  * going out before the bind operation completes. This happens
1034                                  * if two search references come in one behind the other
1035                                  * for the same server with different contexts.
1036                                  */
1037                                 Debug( LDAP_DEBUG_TRACE,
1038                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
1039                                         refarray[i], 0, 0);
1040                                 if( lc->lconn_rebind_queue == NULL ) {
1041                                         /* Create a referral list */
1042                                         lc->lconn_rebind_queue =
1043                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
1044
1045                                         if( lc->lconn_rebind_queue == NULL) {
1046                                                 ld->ld_errno = LDAP_NO_MEMORY;
1047                                                 rc = -1;
1048                                                 goto done;
1049                                         }
1050
1051                                         lc->lconn_rebind_queue[0] = refarray;
1052                                         lc->lconn_rebind_queue[1] = NULL;
1053                                         refarray = NULL;
1054
1055                                 } else {
1056                                         /* Count how many referral arrays we already have */
1057                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
1058                                                 /* empty */;
1059                                         }
1060
1061                                         /* Add the new referral to the list */
1062                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
1063                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
1064
1065                                         if( lc->lconn_rebind_queue == NULL ) {
1066                                                 ld->ld_errno = LDAP_NO_MEMORY;
1067                                                 rc = -1;
1068                                                 goto done;
1069                                         }
1070                                         lc->lconn_rebind_queue[j] = refarray;
1071                                         lc->lconn_rebind_queue[j+1] = NULL;
1072                                         refarray = NULL;
1073                                 }
1074
1075                                 /* We have queued the referral/reference, now just return */
1076                                 rc = 0;
1077                                 *hadrefp = 1;
1078                                 count = 1; /* Pretend we already followed referral */
1079                                 goto done;
1080                         }
1081                 }
1082                 /* Re-encode the request with the new starting point of the search.
1083                  * Note: In the future we also need to replace the filter if one
1084                  * was provided with the search reference
1085                  */
1086
1087                 /* For references we don't want old dn if new dn empty */
1088                 if ( sref && srv->lud_dn == NULL ) {
1089                         srv->lud_dn = LDAP_STRDUP( "" );
1090                 }
1091
1092                 LDAP_NEXT_MSGID( ld, id );
1093                 ber = re_encode_request( ld, origreq->lr_ber, id,
1094                         sref, srv, &rinfo.ri_request );
1095
1096                 if( ber == NULL ) {
1097                         ld->ld_errno = LDAP_ENCODING_ERROR;
1098                         rc = -1;
1099                         goto done;
1100                 }
1101
1102                 Debug( LDAP_DEBUG_TRACE,
1103                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
1104                         lr->lr_msgid, refarray[i], 0);
1105
1106                 /* Send the new request to the server - may require a bind */
1107                 rinfo.ri_msgid = origreq->lr_origid;
1108                 rinfo.ri_url = refarray[i];
1109 #ifdef LDAP_R_COMPILE
1110                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1111 #endif
1112                 rc = ldap_send_server_request( ld, ber, id,
1113                         origreq, &srv, NULL, &rinfo );
1114 #ifdef LDAP_R_COMPILE
1115                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1116 #endif
1117                 if ( rc < 0 ) {
1118                         /* Failure, try next referral in the list */
1119                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
1120                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1121                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
1122                         ldap_free_urllist( srv );
1123                         srv = NULL;
1124                         ld->ld_errno = LDAP_REFERRAL;
1125                 } else {
1126                         /* Success, no need to try this referral list further */
1127                         rc = 0;
1128                         ++count;
1129                         *hadrefp = 1;
1130
1131                         /* check if there is a queue of referrals that came in during bind */
1132                         if ( lc == NULL) {
1133                                 lc = find_connection( ld, srv, 1 );
1134                                 if ( lc == NULL ) {
1135                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
1136                                         rc = -1;
1137                                         goto done;
1138                                 }
1139                         }
1140
1141                         if ( lc->lconn_rebind_queue != NULL ) {
1142                                 /* Release resources of previous list */
1143                                 LDAP_VFREE( refarray );
1144                                 refarray = NULL;
1145                                 ldap_free_urllist( srv );
1146                                 srv = NULL;
1147
1148                                 /* Pull entries off end of queue so list always null terminated */
1149                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
1150                                         ;
1151                                 refarray = lc->lconn_rebind_queue[j - 1];
1152                                 lc->lconn_rebind_queue[j-1] = NULL;
1153                                 /* we pulled off last entry from queue, free queue */
1154                                 if ( j == 1 ) {
1155                                         LDAP_FREE( lc->lconn_rebind_queue );
1156                                         lc->lconn_rebind_queue = NULL;
1157                                 }
1158                                 /* restart the loop the with new referral list */
1159                                 i = -1;
1160                                 continue;
1161                         }
1162                         break; /* referral followed, break out of for loop */
1163                 }
1164         } /* end for loop */
1165 done:
1166         LDAP_VFREE( refarray );
1167         ldap_free_urllist( srv );
1168         LDAP_FREE( *errstrp );
1169
1170         if( rc == 0 ) {
1171                 *errstrp = NULL;
1172                 LDAP_FREE( unfollowed );
1173                 return count;
1174         } else {
1175                 *errstrp = unfollowed;
1176                 return rc;
1177         }
1178 }
1179
1180 /*
1181  * XXX merging of errors in this routine needs to be improved
1182  */
1183 int
1184 ldap_chase_referrals( LDAP *ld,
1185         LDAPRequest *lr,
1186         char **errstrp,
1187         int sref,
1188         int *hadrefp )
1189 {
1190         int             rc, count, id;
1191         unsigned        len;
1192         char            *p, *ref, *unfollowed;
1193         LDAPRequest     *origreq;
1194         LDAPURLDesc     *srv;
1195         BerElement      *ber;
1196         LDAPreqinfo  rinfo;
1197         LDAPConn        *lc;
1198
1199         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1200
1201         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1202         *hadrefp = 0;
1203
1204         if ( *errstrp == NULL ) {
1205                 return( 0 );
1206         }
1207
1208         len = strlen( *errstrp );
1209         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1210                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1211                         *p = '\0';
1212                         p += LDAP_REF_STR_LEN;
1213                         break;
1214                 }
1215         }
1216
1217         if ( len < LDAP_REF_STR_LEN ) {
1218                 return( 0 );
1219         }
1220
1221         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1222                 Debug( LDAP_DEBUG_ANY,
1223                     "more than %d referral hops (dropping)\n",
1224                     ld->ld_refhoplimit, 0, 0 );
1225                     /* XXX report as error in ld->ld_errno? */
1226                     return( 0 );
1227         }
1228
1229         /* find original request */
1230         for ( origreq = lr; origreq->lr_parent != NULL;
1231              origreq = origreq->lr_parent ) {
1232                 /* empty */;
1233         }
1234
1235         unfollowed = NULL;
1236         rc = count = 0;
1237
1238         /* parse out & follow referrals */
1239         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1240                 p = strchr( ref, '\n' );
1241                 if ( p != NULL ) {
1242                         *p++ = '\0';
1243                 }
1244
1245                 rc = ldap_url_parse_ext( ref, &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1246                 if ( rc != LDAP_URL_SUCCESS ) {
1247                         Debug( LDAP_DEBUG_TRACE,
1248                                 "ignoring %s referral <%s>\n",
1249                                 ref, rc == LDAP_URL_ERR_BADSCHEME ? "unknown" : "incorrect", 0 );
1250                         rc = ldap_append_referral( ld, &unfollowed, ref );
1251                         *hadrefp = 1;
1252                         continue;
1253                 }
1254
1255                 Debug( LDAP_DEBUG_TRACE,
1256                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1257
1258                 *hadrefp = 1;
1259
1260                 /* See if we've already been here */
1261                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1262                         LDAPRequest *lp;
1263                         int looped = 0;
1264                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1265                         for ( lp = lr; lp; lp = lp->lr_parent ) {
1266                                 if ( lp->lr_conn == lc
1267                                         && len == lp->lr_dn.bv_len )
1268                                 {
1269                                         if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) )
1270                                                         continue;
1271                                         looped = 1;
1272                                         break;
1273                                 }
1274                         }
1275                         if ( looped ) {
1276                                 ldap_free_urllist( srv );
1277                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1278                                 rc = -1;
1279                                 continue;
1280                         }
1281                 }
1282
1283                 LDAP_NEXT_MSGID( ld, id );
1284                 ber = re_encode_request( ld, origreq->lr_ber,
1285                     id, sref, srv, &rinfo.ri_request );
1286
1287                 if ( ber == NULL ) {
1288                         return -1 ;
1289                 }
1290
1291                 /* copy the complete referral for rebind process */
1292                 rinfo.ri_url = LDAP_STRDUP( ref );
1293
1294                 rinfo.ri_msgid = origreq->lr_origid;
1295
1296 #ifdef LDAP_R_COMPILE
1297                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1298 #endif
1299                 rc = ldap_send_server_request( ld, ber, id,
1300                         lr, &srv, NULL, &rinfo );
1301 #ifdef LDAP_R_COMPILE
1302                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1303 #endif
1304
1305                 LDAP_FREE( rinfo.ri_url );
1306
1307                 if( rc >= 0 ) {
1308                         ++count;
1309                 } else {
1310                         Debug( LDAP_DEBUG_ANY,
1311                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1312                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1313                         rc = ldap_append_referral( ld, &unfollowed, ref );
1314                 }
1315
1316                 ldap_free_urllist(srv);
1317         }
1318
1319         LDAP_FREE( *errstrp );
1320         *errstrp = unfollowed;
1321
1322         return(( rc == 0 ) ? count : rc );
1323 }
1324
1325
1326 int
1327 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1328 {
1329         int     first;
1330
1331         if ( *referralsp == NULL ) {
1332                 first = 1;
1333                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1334                     + 1 );
1335         } else {
1336                 first = 0;
1337                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1338                     strlen( *referralsp ) + strlen( s ) + 2 );
1339         }
1340
1341         if ( *referralsp == NULL ) {
1342                 ld->ld_errno = LDAP_NO_MEMORY;
1343                 return( -1 );
1344         }
1345
1346         if ( first ) {
1347                 strcpy( *referralsp, LDAP_REF_STR );
1348         } else {
1349                 strcat( *referralsp, "\n" );
1350         }
1351         strcat( *referralsp, s );
1352
1353         return( 0 );
1354 }
1355
1356
1357
1358 static BerElement *
1359 re_encode_request( LDAP *ld,
1360         BerElement *origber,
1361         ber_int_t msgid,
1362         int sref,
1363         LDAPURLDesc *srv,
1364         int *type )
1365 {
1366         /*
1367          * XXX this routine knows way too much about how the lber library works!
1368          */
1369         ber_int_t       along;
1370         ber_tag_t       tag;
1371         ber_tag_t       rtag;
1372         ber_int_t       ver;
1373         ber_int_t       scope;
1374         int             rc;
1375         BerElement      tmpber, *ber;
1376         struct berval           dn;
1377
1378         Debug( LDAP_DEBUG_TRACE,
1379             "re_encode_request: new msgid %ld, new dn <%s>\n",
1380             (long) msgid,
1381                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1382
1383         tmpber = *origber;
1384
1385         /*
1386          * all LDAP requests are sequences that start with a message id.
1387          * For all except delete, this is followed by a sequence that is
1388          * tagged with the operation code.  For delete, the provided DN
1389          * is not wrapped by a sequence.
1390          */
1391         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1392
1393         if ( rtag == LBER_ERROR ) {
1394                 ld->ld_errno = LDAP_DECODING_ERROR;
1395                 return( NULL );
1396         }
1397
1398         assert( tag != 0);
1399         if ( tag == LDAP_REQ_BIND ) {
1400                 /* bind requests have a version number before the DN & other stuff */
1401                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &dn );
1402
1403         } else if ( tag == LDAP_REQ_DELETE ) {
1404                 /* delete requests don't have a DN wrapping sequence */
1405                 rtag = ber_scanf( &tmpber, "m", &dn );
1406
1407         } else if ( tag == LDAP_REQ_SEARCH ) {
1408                 /* search requests need to be re-scope-ed */
1409                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &dn, &scope );
1410
1411                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1412                         /* use the scope provided in reference */
1413                         scope = srv->lud_scope;
1414
1415                 } else if ( sref ) {
1416                         /* use scope implied by previous operation
1417                          *   base -> base
1418                          *   one -> base
1419                          *   subtree -> subtree
1420                          *   subordinate -> subtree
1421                          */
1422                         switch( scope ) {
1423                         default:
1424                         case LDAP_SCOPE_BASE:
1425                         case LDAP_SCOPE_ONELEVEL:
1426                                 scope = LDAP_SCOPE_BASE;
1427                                 break;
1428                         case LDAP_SCOPE_SUBTREE:
1429                         case LDAP_SCOPE_SUBORDINATE:
1430                                 scope = LDAP_SCOPE_SUBTREE;
1431                                 break;
1432                         }
1433                 }
1434
1435         } else {
1436                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &dn );
1437         }
1438
1439         if( rtag == LBER_ERROR ) {
1440                 ld->ld_errno = LDAP_DECODING_ERROR;
1441                 return NULL;
1442         }
1443
1444         /* restore character zero'd out by ber_scanf*/
1445         dn.bv_val[dn.bv_len] = tmpber.ber_tag;
1446
1447         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1448                 return NULL;
1449         }
1450
1451         if ( srv->lud_dn ) {
1452                 ber_str2bv( srv->lud_dn, 0, 0, &dn );
1453         }
1454
1455         if ( tag == LDAP_REQ_BIND ) {
1456                 rc = ber_printf( ber, "{it{iO" /*}}*/, msgid, tag, ver, &dn );
1457         } else if ( tag == LDAP_REQ_DELETE ) {
1458                 rc = ber_printf( ber, "{itON}", msgid, tag, &dn );
1459         } else if ( tag == LDAP_REQ_SEARCH ) {
1460                 rc = ber_printf( ber, "{it{Oe" /*}}*/, msgid, tag, &dn, scope );
1461         } else {
1462                 rc = ber_printf( ber, "{it{O" /*}}*/, msgid, tag, &dn );
1463         }
1464
1465         if ( rc == -1 ) {
1466                 ld->ld_errno = LDAP_ENCODING_ERROR;
1467                 ber_free( ber, 1 );
1468                 return NULL;
1469         }
1470
1471         if ( tag != LDAP_REQ_DELETE && (
1472                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1473                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1474             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1475         {
1476                 ld->ld_errno = LDAP_ENCODING_ERROR;
1477                 ber_free( ber, 1 );
1478                 return NULL;
1479         }
1480
1481 #ifdef LDAP_DEBUG
1482         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1483                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1484                     0, 0, 0 );
1485                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1486         }
1487 #endif /* LDAP_DEBUG */
1488
1489         *type = tag;    /* return request type */
1490         return ber;
1491 }
1492
1493
1494 LDAPRequest *
1495 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1496 {
1497         LDAPRequest     *lr;
1498
1499 #ifdef LDAP_R_COMPILE
1500         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1501 #endif
1502         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1503                 if ( lr->lr_status == LDAP_REQST_COMPLETED ) {
1504                         continue;       /* Skip completed requests */
1505                 }
1506                 if ( msgid == lr->lr_msgid ) {
1507                         lr->lr_refcnt++;
1508                         break;
1509                 }
1510         }
1511 #ifdef LDAP_R_COMPILE
1512         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1513 #endif
1514
1515         return( lr );
1516 }
1517
1518 void
1519 ldap_return_request( LDAP *ld, LDAPRequest *lrx, int freeit )
1520 {
1521         LDAPRequest     *lr;
1522
1523 #ifdef LDAP_R_COMPILE
1524         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1525 #endif
1526         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1527                 if ( lr == lrx ) {
1528                         if ( lr->lr_refcnt > 0 ) {
1529                                 lr->lr_refcnt--;
1530
1531                         } else if ( lr->lr_refcnt < 0 ) {
1532                                 lr->lr_refcnt++;
1533                                 if ( lr->lr_refcnt == 0 ) {
1534                                         lr = NULL;
1535                                 }
1536                         }
1537                         break;
1538                 }
1539         }
1540         if ( lr == NULL ) {
1541                 ldap_free_request_int( ld, lrx );
1542
1543         } else if ( freeit ) {
1544                 ldap_free_request( ld, lrx );
1545         }
1546 #ifdef LDAP_R_COMPILE
1547         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1548 #endif
1549 }