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                                 if ( ld->ld_defconn == lc ) {
 635                                         ld->ld_defconn = NULL;
 636                                 }
 637                                 break;
 638                         }
 639                         prevlc = tmplc;
 640                 }
 641 #ifdef LDAP_R_COMPILE
 642                 ldap_pvt_thread_mutex_unlock( &ld->ld_conn_mutex );
 643 #endif
 644
 645                 /* process connection callbacks */
 646                 {
 647                         struct ldapoptions *lo;
 648                         ldaplist *ll;
 649                         ldap_conncb *cb;
 650
 651                         lo = &ld->ld_options;
 652                         if ( lo->ldo_conn_cbs ) {
 653                                 for ( ll=lo->ldo_conn_cbs; ll; ll=ll->ll_next ) {
 654                                         cb = ll->ll_data;
 655                                         cb->lc_del( ld, lc->lconn_sb, cb );
 656                                 }
 657                         }
 658                         lo = LDAP_INT_GLOBAL_OPT();
 659                         if ( lo->ldo_conn_cbs ) {
 660                                 for ( ll=lo->ldo_conn_cbs; ll; ll=ll->ll_next ) {
 661                                         cb = ll->ll_data;
 662                                         cb->lc_del( ld, lc->lconn_sb, cb );
 663                                 }
 664                         }
 665                 }
 666
 667                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 668                         ldap_mark_select_clear( ld, lc->lconn_sb );
 669                         if ( unbind ) {
 670                                 ldap_send_unbind( ld, lc->lconn_sb,
 671                                                 NULL, NULL );
 672                         }
 673                 }
 674
 675                 if ( lc->lconn_ber != NULL ) {
 676                         ber_free( lc->lconn_ber, 1 );
 677                 }
 678
 679                 ldap_int_sasl_close( ld, lc );
 680
 681                 ldap_free_urllist( lc->lconn_server );
 682
 683                 /* FIXME: is this at all possible?
 684                  * ldap_ld_free() in unbind.c calls ldap_free_connection()
 685                  * with force == 1 __after__ explicitly calling
 686                  * ldap_free_request() on all requests */
 687                 if ( force ) {
 688                         LDAPRequest     *lr;
 689
 690                         for ( lr = ld->ld_requests; lr; ) {
 691                                 LDAPRequest     *lr_next = lr->lr_next;
 692
 693                                 if ( lr->lr_conn == lc ) {
 694                                         ldap_free_request_int( ld, lr );
 695                                 }
 696
 697                                 lr = lr_next;
 698                         }
 699                 }
 700
 701                 if ( lc->lconn_sb != ld->ld_sb ) {
 702                         ber_sockbuf_free( lc->lconn_sb );
 703                 } else {
 704                         ber_int_sb_close( lc->lconn_sb );
 705                 }
 706
 707                 if ( lc->lconn_rebind_queue != NULL) {
 708                         int i;
 709                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 710                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 711                         }
 712                         LDAP_FREE( lc->lconn_rebind_queue );
 713                 }
 714
 715                 LDAP_FREE( lc );
 716
 717                 Debug( LDAP_DEBUG_TRACE,
 718                         "ldap_free_connection: actually freed\n",
 719                         0, 0, 0 );
 720
 721         } else {
 722                 lc->lconn_lastused = time( NULL );
 723                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 724                                 lc->lconn_refcnt, 0, 0 );
 725         }
 726 }
 727
 728
 729 #ifdef LDAP_DEBUG
 730 void
 731 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 732 {
 733         LDAPConn        *lc;
 734         char            timebuf[32];
 735
 736         Debug( LDAP_DEBUG_TRACE, "** ld %p Connection%s:\n", (void *)ld, all ? "s" : "", 0 );
 737         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 738                 if ( lc->lconn_server != NULL ) {
 739                         Debug( LDAP_DEBUG_TRACE, "* host: %s  port: %d%s\n",
 740                                 ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 741                                 : lc->lconn_server->lud_host,
 742                                 lc->lconn_server->lud_port, ( lc->lconn_sb ==
 743                                 ld->ld_sb ) ? "  (default)" : "" );
 744                 }
 745                 Debug( LDAP_DEBUG_TRACE, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 746                         ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET )
 747                                 ? "NeedSocket" :
 748                                 ( lc->lconn_status == LDAP_CONNST_CONNECTING )
 749                                         ? "Connecting" : "Connected", 0 );
 750                 Debug( LDAP_DEBUG_TRACE, "  last used: %s%s\n",
 751                         ldap_pvt_ctime( &lc->lconn_lastused, timebuf ),
 752                         lc->lconn_rebind_inprogress ? "  rebind in progress" : "", 0 );
 753                 if ( lc->lconn_rebind_inprogress ) {
 754                         if ( lc->lconn_rebind_queue != NULL) {
 755                                 int     i;
 756
 757                                 for ( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 758                                         int     j;
 759                                         for( j = 0; lc->lconn_rebind_queue[i][j] != 0; j++ ) {
 760                                                 Debug( LDAP_DEBUG_TRACE, "    queue %d entry %d - %s\n",
 761                                                         i, j, lc->lconn_rebind_queue[i][j] );
 762                                         }
 763                                 }
 764                         } else {
 765                                 Debug( LDAP_DEBUG_TRACE, "    queue is empty\n", 0, 0, 0 );
 766                         }
 767                 }
 768                 Debug( LDAP_DEBUG_TRACE, "\n", 0, 0, 0 );
 769                 if ( !all ) {
 770                         break;
 771                 }
 772         }
 773 }
 774
 775
 776 void
 777 ldap_dump_requests_and_responses( LDAP *ld )
 778 {
 779         LDAPRequest     *lr;
 780         LDAPMessage     *lm, *l;
 781         int             i;
 782
 783         Debug( LDAP_DEBUG_TRACE, "** ld %p Outstanding Requests:\n",
 784                 (void *)ld, 0, 0 );
 785         lr = ld->ld_requests;
 786         if ( lr == NULL ) {
 787                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 788         }
 789         for ( i = 0; lr != NULL; lr = lr->lr_next, i++ ) {
 790                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  origid %d, status %s\n",
 791                         lr->lr_msgid, lr->lr_origid,
 792                         ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 793                         ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 794                         ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 795                         ( lr->lr_status == LDAP_REQST_WRITING ) ? "Writing" :
 796                         ( lr->lr_status == LDAP_REQST_COMPLETED ) ? "RequestCompleted"
 797                                 : "InvalidStatus" );
 798                 Debug( LDAP_DEBUG_TRACE, "   outstanding referrals %d, parent count %d\n",
 799                         lr->lr_outrefcnt, lr->lr_parentcnt, 0 );
 800         }
 801         Debug( LDAP_DEBUG_TRACE, "  ld %p request count %d (abandoned %lu)\n",
 802                 (void *)ld, i, ld->ld_nabandoned );
 803         Debug( LDAP_DEBUG_TRACE, "** ld %p Response Queue:\n", (void *)ld, 0, 0 );
 804         if ( ( lm = ld->ld_responses ) == NULL ) {
 805                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 806         }
 807         for ( i = 0; lm != NULL; lm = lm->lm_next, i++ ) {
 808                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  type %lu\n",
 809                     lm->lm_msgid, (unsigned long)lm->lm_msgtype, 0 );
 810                 if ( lm->lm_chain != NULL ) {
 811                         Debug( LDAP_DEBUG_TRACE, "   chained responses:\n", 0, 0, 0 );
 812                         for ( l = lm->lm_chain; l != NULL; l = l->lm_chain ) {
 813                                 Debug( LDAP_DEBUG_TRACE,
 814                                         "  * msgid %d,  type %lu\n",
 815                                         l->lm_msgid,
 816                                         (unsigned long)l->lm_msgtype, 0 );
 817                         }
 818                 }
 819         }
 820         Debug( LDAP_DEBUG_TRACE, "  ld %p response count %d\n", (void *)ld, i, 0 );
 821 }
 822 #endif /* LDAP_DEBUG */
 823
 824 static void
 825 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 826 {
 827         /* if lr_refcnt > 0, the request has been looked up
 828          * by ldap_find_request_by_msgid(); if in the meanwhile
 829          * the request is free()'d by someone else, just decrease
 830          * the reference count and extract it from the request
 831          * list; later on, it will be freed. */
 832         if ( lr->lr_prev == NULL ) {
 833                 if ( lr->lr_refcnt == 0 ) {
 834                         /* free'ing the first request? */
 835                         assert( ld->ld_requests == lr );
 836                 }
 837
 838                 if ( ld->ld_requests == lr ) {
 839                         ld->ld_requests = lr->lr_next;
 840                 }
 841
 842         } else {
 843                 lr->lr_prev->lr_next = lr->lr_next;
 844         }
 845
 846         if ( lr->lr_next != NULL ) {
 847                 lr->lr_next->lr_prev = lr->lr_prev;
 848         }
 849
 850         if ( lr->lr_refcnt > 0 ) {
 851                 lr->lr_refcnt = -lr->lr_refcnt;
 852
 853                 lr->lr_prev = NULL;
 854                 lr->lr_next = NULL;
 855
 856                 return;
 857         }
 858
 859         if ( lr->lr_ber != NULL ) {
 860                 ber_free( lr->lr_ber, 1 );
 861                 lr->lr_ber = NULL;
 862         }
 863
 864         if ( lr->lr_res_error != NULL ) {
 865                 LDAP_FREE( lr->lr_res_error );
 866                 lr->lr_res_error = NULL;
 867         }
 868
 869         if ( lr->lr_res_matched != NULL ) {
 870                 LDAP_FREE( lr->lr_res_matched );
 871                 lr->lr_res_matched = NULL;
 872         }
 873
 874         LDAP_FREE( lr );
 875 }
 876
 877 void
 878 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 879 {
 880 #ifdef LDAP_R_COMPILE
 881         LDAP_PVT_THREAD_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 882 #endif
 883
 884         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 885                 lr->lr_origid, lr->lr_msgid, 0 );
 886
 887         /* free all referrals (child requests) */
 888         while ( lr->lr_child ) {
 889                 ldap_free_request( ld, lr->lr_child );
 890         }
 891
 892         if ( lr->lr_parent != NULL ) {
 893                 LDAPRequest     **lrp;
 894
 895                 --lr->lr_parent->lr_outrefcnt;
 896                 for ( lrp = &lr->lr_parent->lr_child;
 897                         *lrp && *lrp != lr;
 898                         lrp = &(*lrp)->lr_refnext );
 899
 900                 if ( *lrp == lr ) {
 901                         *lrp = lr->lr_refnext;
 902                 }
 903         }
 904         ldap_free_request_int( ld, lr );
 905 }
 906
 907 /*
 908  * call first time with *cntp = -1
 909  * when returns *cntp == -1, no referrals are left
 910  *
 911  * NOTE: may replace *refsp, or shuffle the contents
 912  * of the original array.
 913  */
 914 static int ldap_int_nextref(
 915         LDAP                    *ld,
 916         char                    ***refsp,
 917         int                     *cntp,
 918         void                    *params )
 919 {
 920         assert( refsp != NULL );
 921         assert( *refsp != NULL );
 922         assert( cntp != NULL );
 923
 924         if ( *cntp < -1 ) {
 925                 *cntp = -1;
 926                 return -1;
 927         }
 928
 929         (*cntp)++;
 930
 931         if ( (*refsp)[ *cntp ] == NULL ) {
 932                 *cntp = -1;
 933         }
 934
 935         return 0;
 936 }
 937
 938 /*
 939  * Chase v3 referrals
 940  *
 941  * Parameters:
 942  *  (IN) ld = LDAP connection handle
 943  *  (IN) lr = LDAP Request structure
 944  *  (IN) refs = array of pointers to referral strings that we will chase
 945  *              The array will be free'd by this function when no longer needed
 946  *  (IN) sref != 0 if following search reference
 947  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 948  *  (OUT) hadrefp = 1 if sucessfully followed referral
 949  *
 950  * Return value - number of referrals followed
 951  */
 952 int
 953 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 954 {
 955         char            *unfollowed;
 956         int              unfollowedcnt = 0;
 957         LDAPRequest     *origreq;
 958         LDAPURLDesc     *srv = NULL;
 959         BerElement      *ber;
 960         char            **refarray = NULL;
 961         LDAPConn        *lc;
 962         int                      rc, count, i, j, id;
 963         LDAPreqinfo  rinfo;
 964
 965         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 966         *hadrefp = 0;
 967
 968         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 969
 970         unfollowed = NULL;
 971         rc = count = 0;
 972
 973         /* If no referrals in array, return */
 974         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 975                 rc = 0;
 976                 goto done;
 977         }
 978
 979         /* Check for hop limit exceeded */
 980         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 981                 Debug( LDAP_DEBUG_ANY,
 982                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 983                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 984                 rc = -1;
 985                 goto done;
 986         }
 987
 988         /* find original request */
 989         for ( origreq = lr;
 990                 origreq->lr_parent != NULL;
 991                 origreq = origreq->lr_parent )
 992         {
 993                 /* empty */ ;
 994         }
 995
 996         refarray = refs;
 997         refs = NULL;
 998
 999         if ( ld->ld_nextref_proc == NULL ) {
1000                 ld->ld_nextref_proc = ldap_int_nextref;
1001         }
1002
1003         /* parse out & follow referrals */
1004         i = -1;
1005         for ( ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
1006                         i != -1;
1007                         ld->ld_nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
1008         {
1009
1010                 /* Parse the referral URL */
1011                 rc = ldap_url_parse_ext( refarray[i], &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1012                 if ( rc != LDAP_URL_SUCCESS ) {
1013                         /* ldap_url_parse_ext() returns LDAP_URL_* errors
1014                          * which do not map on API errors */
1015                         ld->ld_errno = LDAP_PARAM_ERROR;
1016                         rc = -1;
1017                         goto done;
1018                 }
1019
1020                 if( srv->lud_crit_exts ) {
1021                         /* we do not support any extensions */
1022                         ld->ld_errno = LDAP_NOT_SUPPORTED;
1023                         rc = -1;
1024                         goto done;
1025                 }
1026
1027                 /* check connection for re-bind in progress */
1028                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1029                         /* See if we've already requested this DN with this conn */
1030                         LDAPRequest *lp;
1031                         int looped = 0;
1032                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1033                         for ( lp = origreq; lp; ) {
1034                                 if ( lp->lr_conn == lc
1035                                         && len == lp->lr_dn.bv_len
1036                                         && len
1037                                         && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) == 0 )
1038                                 {
1039                                         looped = 1;
1040                                         break;
1041                                 }
1042                                 if ( lp == origreq ) {
1043                                         lp = lp->lr_child;
1044                                 } else {
1045                                         lp = lp->lr_refnext;
1046                                 }
1047                         }
1048                         if ( looped ) {
1049                                 ldap_free_urllist( srv );
1050                                 srv = NULL;
1051                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1052                                 rc = -1;
1053                                 continue;
1054                         }
1055
1056                         if ( lc->lconn_rebind_inprogress ) {
1057                                 /* We are already chasing a referral or search reference and a
1058                                  * bind on that connection is in progress.  We must queue
1059                                  * referrals on that connection, so we don't get a request
1060                                  * going out before the bind operation completes. This happens
1061                                  * if two search references come in one behind the other
1062                                  * for the same server with different contexts.
1063                                  */
1064                                 Debug( LDAP_DEBUG_TRACE,
1065                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
1066                                         refarray[i], 0, 0);
1067                                 if( lc->lconn_rebind_queue == NULL ) {
1068                                         /* Create a referral list */
1069                                         lc->lconn_rebind_queue =
1070                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
1071
1072                                         if( lc->lconn_rebind_queue == NULL) {
1073                                                 ld->ld_errno = LDAP_NO_MEMORY;
1074                                                 rc = -1;
1075                                                 goto done;
1076                                         }
1077
1078                                         lc->lconn_rebind_queue[0] = refarray;
1079                                         lc->lconn_rebind_queue[1] = NULL;
1080                                         refarray = NULL;
1081
1082                                 } else {
1083                                         /* Count how many referral arrays we already have */
1084                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
1085                                                 /* empty */;
1086                                         }
1087
1088                                         /* Add the new referral to the list */
1089                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
1090                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
1091
1092                                         if( lc->lconn_rebind_queue == NULL ) {
1093                                                 ld->ld_errno = LDAP_NO_MEMORY;
1094                                                 rc = -1;
1095                                                 goto done;
1096                                         }
1097                                         lc->lconn_rebind_queue[j] = refarray;
1098                                         lc->lconn_rebind_queue[j+1] = NULL;
1099                                         refarray = NULL;
1100                                 }
1101
1102                                 /* We have queued the referral/reference, now just return */
1103                                 rc = 0;
1104                                 *hadrefp = 1;
1105                                 count = 1; /* Pretend we already followed referral */
1106                                 goto done;
1107                         }
1108                 }
1109                 /* Re-encode the request with the new starting point of the search.
1110                  * Note: In the future we also need to replace the filter if one
1111                  * was provided with the search reference
1112                  */
1113
1114                 /* For references we don't want old dn if new dn empty */
1115                 if ( sref && srv->lud_dn == NULL ) {
1116                         srv->lud_dn = LDAP_STRDUP( "" );
1117                 }
1118
1119                 LDAP_NEXT_MSGID( ld, id );
1120                 ber = re_encode_request( ld, origreq->lr_ber, id,
1121                         sref, srv, &rinfo.ri_request );
1122
1123                 if( ber == NULL ) {
1124                         ld->ld_errno = LDAP_ENCODING_ERROR;
1125                         rc = -1;
1126                         goto done;
1127                 }
1128
1129                 Debug( LDAP_DEBUG_TRACE,
1130                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
1131                         lr->lr_msgid, refarray[i], 0);
1132
1133                 /* Send the new request to the server - may require a bind */
1134                 rinfo.ri_msgid = origreq->lr_origid;
1135                 rinfo.ri_url = refarray[i];
1136 #ifdef LDAP_R_COMPILE
1137                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1138 #endif
1139                 rc = ldap_send_server_request( ld, ber, id,
1140                         origreq, &srv, NULL, &rinfo );
1141 #ifdef LDAP_R_COMPILE
1142                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1143 #endif
1144                 if ( rc < 0 ) {
1145                         /* Failure, try next referral in the list */
1146                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
1147                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1148                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
1149                         ldap_free_urllist( srv );
1150                         srv = NULL;
1151                         ld->ld_errno = LDAP_REFERRAL;
1152                 } else {
1153                         /* Success, no need to try this referral list further */
1154                         rc = 0;
1155                         ++count;
1156                         *hadrefp = 1;
1157
1158                         /* check if there is a queue of referrals that came in during bind */
1159                         if ( lc == NULL) {
1160                                 lc = find_connection( ld, srv, 1 );
1161                                 if ( lc == NULL ) {
1162                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
1163                                         rc = -1;
1164                                         goto done;
1165                                 }
1166                         }
1167
1168                         if ( lc->lconn_rebind_queue != NULL ) {
1169                                 /* Release resources of previous list */
1170                                 LDAP_VFREE( refarray );
1171                                 refarray = NULL;
1172                                 ldap_free_urllist( srv );
1173                                 srv = NULL;
1174
1175                                 /* Pull entries off end of queue so list always null terminated */
1176                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
1177                                         ;
1178                                 refarray = lc->lconn_rebind_queue[j - 1];
1179                                 lc->lconn_rebind_queue[j-1] = NULL;
1180                                 /* we pulled off last entry from queue, free queue */
1181                                 if ( j == 1 ) {
1182                                         LDAP_FREE( lc->lconn_rebind_queue );
1183                                         lc->lconn_rebind_queue = NULL;
1184                                 }
1185                                 /* restart the loop the with new referral list */
1186                                 i = -1;
1187                                 continue;
1188                         }
1189                         break; /* referral followed, break out of for loop */
1190                 }
1191         } /* end for loop */
1192 done:
1193         LDAP_VFREE( refarray );
1194         ldap_free_urllist( srv );
1195         LDAP_FREE( *errstrp );
1196
1197         if( rc == 0 ) {
1198                 *errstrp = NULL;
1199                 LDAP_FREE( unfollowed );
1200                 return count;
1201         } else {
1202                 *errstrp = unfollowed;
1203                 return rc;
1204         }
1205 }
1206
1207 /*
1208  * XXX merging of errors in this routine needs to be improved
1209  */
1210 int
1211 ldap_chase_referrals( LDAP *ld,
1212         LDAPRequest *lr,
1213         char **errstrp,
1214         int sref,
1215         int *hadrefp )
1216 {
1217         int             rc, count, id;
1218         unsigned        len;
1219         char            *p, *ref, *unfollowed;
1220         LDAPRequest     *origreq;
1221         LDAPURLDesc     *srv;
1222         BerElement      *ber;
1223         LDAPreqinfo  rinfo;
1224         LDAPConn        *lc;
1225
1226         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1227
1228         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1229         *hadrefp = 0;
1230
1231         if ( *errstrp == NULL ) {
1232                 return( 0 );
1233         }
1234
1235         len = strlen( *errstrp );
1236         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1237                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1238                         *p = '\0';
1239                         p += LDAP_REF_STR_LEN;
1240                         break;
1241                 }
1242         }
1243
1244         if ( len < LDAP_REF_STR_LEN ) {
1245                 return( 0 );
1246         }
1247
1248         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1249                 Debug( LDAP_DEBUG_ANY,
1250                     "more than %d referral hops (dropping)\n",
1251                     ld->ld_refhoplimit, 0, 0 );
1252                     /* XXX report as error in ld->ld_errno? */
1253                     return( 0 );
1254         }
1255
1256         /* find original request */
1257         for ( origreq = lr; origreq->lr_parent != NULL;
1258              origreq = origreq->lr_parent ) {
1259                 /* empty */;
1260         }
1261
1262         unfollowed = NULL;
1263         rc = count = 0;
1264
1265         /* parse out & follow referrals */
1266         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1267                 p = strchr( ref, '\n' );
1268                 if ( p != NULL ) {
1269                         *p++ = '\0';
1270                 }
1271
1272                 rc = ldap_url_parse_ext( ref, &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1273                 if ( rc != LDAP_URL_SUCCESS ) {
1274                         Debug( LDAP_DEBUG_TRACE,
1275                                 "ignoring %s referral <%s>\n",
1276                                 ref, rc == LDAP_URL_ERR_BADSCHEME ? "unknown" : "incorrect", 0 );
1277                         rc = ldap_append_referral( ld, &unfollowed, ref );
1278                         *hadrefp = 1;
1279                         continue;
1280                 }
1281
1282                 Debug( LDAP_DEBUG_TRACE,
1283                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1284
1285                 *hadrefp = 1;
1286
1287                 /* See if we've already been here */
1288                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1289                         LDAPRequest *lp;
1290                         int looped = 0;
1291                         int len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1292                         for ( lp = lr; lp; lp = lp->lr_parent ) {
1293                                 if ( lp->lr_conn == lc
1294                                         && len == lp->lr_dn.bv_len )
1295                                 {
1296                                         if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) )
1297                                                         continue;
1298                                         looped = 1;
1299                                         break;
1300                                 }
1301                         }
1302                         if ( looped ) {
1303                                 ldap_free_urllist( srv );
1304                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1305                                 rc = -1;
1306                                 continue;
1307                         }
1308                 }
1309
1310                 LDAP_NEXT_MSGID( ld, id );
1311                 ber = re_encode_request( ld, origreq->lr_ber,
1312                     id, sref, srv, &rinfo.ri_request );
1313
1314                 if ( ber == NULL ) {
1315                         return -1 ;
1316                 }
1317
1318                 /* copy the complete referral for rebind process */
1319                 rinfo.ri_url = LDAP_STRDUP( ref );
1320
1321                 rinfo.ri_msgid = origreq->lr_origid;
1322
1323 #ifdef LDAP_R_COMPILE
1324                 ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1325 #endif
1326                 rc = ldap_send_server_request( ld, ber, id,
1327                         lr, &srv, NULL, &rinfo );
1328 #ifdef LDAP_R_COMPILE
1329                 ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1330 #endif
1331
1332                 LDAP_FREE( rinfo.ri_url );
1333
1334                 if( rc >= 0 ) {
1335                         ++count;
1336                 } else {
1337                         Debug( LDAP_DEBUG_ANY,
1338                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1339                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1340                         rc = ldap_append_referral( ld, &unfollowed, ref );
1341                 }
1342
1343                 ldap_free_urllist(srv);
1344         }
1345
1346         LDAP_FREE( *errstrp );
1347         *errstrp = unfollowed;
1348
1349         return(( rc == 0 ) ? count : rc );
1350 }
1351
1352
1353 int
1354 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1355 {
1356         int     first;
1357
1358         if ( *referralsp == NULL ) {
1359                 first = 1;
1360                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1361                     + 1 );
1362         } else {
1363                 first = 0;
1364                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1365                     strlen( *referralsp ) + strlen( s ) + 2 );
1366         }
1367
1368         if ( *referralsp == NULL ) {
1369                 ld->ld_errno = LDAP_NO_MEMORY;
1370                 return( -1 );
1371         }
1372
1373         if ( first ) {
1374                 strcpy( *referralsp, LDAP_REF_STR );
1375         } else {
1376                 strcat( *referralsp, "\n" );
1377         }
1378         strcat( *referralsp, s );
1379
1380         return( 0 );
1381 }
1382
1383
1384
1385 static BerElement *
1386 re_encode_request( LDAP *ld,
1387         BerElement *origber,
1388         ber_int_t msgid,
1389         int sref,
1390         LDAPURLDesc *srv,
1391         int *type )
1392 {
1393         /*
1394          * XXX this routine knows way too much about how the lber library works!
1395          */
1396         ber_int_t       along;
1397         ber_tag_t       tag;
1398         ber_tag_t       rtag;
1399         ber_int_t       ver;
1400         ber_int_t       scope;
1401         int             rc;
1402         BerElement      tmpber, *ber;
1403         struct berval           dn;
1404
1405         Debug( LDAP_DEBUG_TRACE,
1406             "re_encode_request: new msgid %ld, new dn <%s>\n",
1407             (long) msgid,
1408                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1409
1410         tmpber = *origber;
1411
1412         /*
1413          * all LDAP requests are sequences that start with a message id.
1414          * For all except delete, this is followed by a sequence that is
1415          * tagged with the operation code.  For delete, the provided DN
1416          * is not wrapped by a sequence.
1417          */
1418         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1419
1420         if ( rtag == LBER_ERROR ) {
1421                 ld->ld_errno = LDAP_DECODING_ERROR;
1422                 return( NULL );
1423         }
1424
1425         assert( tag != 0);
1426         if ( tag == LDAP_REQ_BIND ) {
1427                 /* bind requests have a version number before the DN & other stuff */
1428                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &dn );
1429
1430         } else if ( tag == LDAP_REQ_DELETE ) {
1431                 /* delete requests don't have a DN wrapping sequence */
1432                 rtag = ber_scanf( &tmpber, "m", &dn );
1433
1434         } else if ( tag == LDAP_REQ_SEARCH ) {
1435                 /* search requests need to be re-scope-ed */
1436                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &dn, &scope );
1437
1438                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1439                         /* use the scope provided in reference */
1440                         scope = srv->lud_scope;
1441
1442                 } else if ( sref ) {
1443                         /* use scope implied by previous operation
1444                          *   base -> base
1445                          *   one -> base
1446                          *   subtree -> subtree
1447                          *   subordinate -> subtree
1448                          */
1449                         switch( scope ) {
1450                         default:
1451                         case LDAP_SCOPE_BASE:
1452                         case LDAP_SCOPE_ONELEVEL:
1453                                 scope = LDAP_SCOPE_BASE;
1454                                 break;
1455                         case LDAP_SCOPE_SUBTREE:
1456                         case LDAP_SCOPE_SUBORDINATE:
1457                                 scope = LDAP_SCOPE_SUBTREE;
1458                                 break;
1459                         }
1460                 }
1461
1462         } else {
1463                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &dn );
1464         }
1465
1466         if( rtag == LBER_ERROR ) {
1467                 ld->ld_errno = LDAP_DECODING_ERROR;
1468                 return NULL;
1469         }
1470
1471         /* restore character zero'd out by ber_scanf*/
1472         dn.bv_val[dn.bv_len] = tmpber.ber_tag;
1473
1474         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1475                 return NULL;
1476         }
1477
1478         if ( srv->lud_dn ) {
1479                 ber_str2bv( srv->lud_dn, 0, 0, &dn );
1480         }
1481
1482         if ( tag == LDAP_REQ_BIND ) {
1483                 rc = ber_printf( ber, "{it{iO" /*}}*/, msgid, tag, ver, &dn );
1484         } else if ( tag == LDAP_REQ_DELETE ) {
1485                 rc = ber_printf( ber, "{itON}", msgid, tag, &dn );
1486         } else if ( tag == LDAP_REQ_SEARCH ) {
1487                 rc = ber_printf( ber, "{it{Oe" /*}}*/, msgid, tag, &dn, scope );
1488         } else {
1489                 rc = ber_printf( ber, "{it{O" /*}}*/, msgid, tag, &dn );
1490         }
1491
1492         if ( rc == -1 ) {
1493                 ld->ld_errno = LDAP_ENCODING_ERROR;
1494                 ber_free( ber, 1 );
1495                 return NULL;
1496         }
1497
1498         if ( tag != LDAP_REQ_DELETE && (
1499                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1500                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1501             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1502         {
1503                 ld->ld_errno = LDAP_ENCODING_ERROR;
1504                 ber_free( ber, 1 );
1505                 return NULL;
1506         }
1507
1508 #ifdef LDAP_DEBUG
1509         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1510                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1511                     0, 0, 0 );
1512                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1513         }
1514 #endif /* LDAP_DEBUG */
1515
1516         *type = tag;    /* return request type */
1517         return ber;
1518 }
1519
1520
1521 LDAPRequest *
1522 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1523 {
1524         LDAPRequest     *lr;
1525
1526 #ifdef LDAP_R_COMPILE
1527         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1528 #endif
1529         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1530                 if ( lr->lr_status == LDAP_REQST_COMPLETED ) {
1531                         continue;       /* Skip completed requests */
1532                 }
1533                 if ( msgid == lr->lr_msgid ) {
1534                         lr->lr_refcnt++;
1535                         break;
1536                 }
1537         }
1538 #ifdef LDAP_R_COMPILE
1539         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1540 #endif
1541
1542         return( lr );
1543 }
1544
1545 void
1546 ldap_return_request( LDAP *ld, LDAPRequest *lrx, int freeit )
1547 {
1548         LDAPRequest     *lr;
1549
1550 #ifdef LDAP_R_COMPILE
1551         ldap_pvt_thread_mutex_lock( &ld->ld_req_mutex );
1552 #endif
1553         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1554                 if ( lr == lrx ) {
1555                         if ( lr->lr_refcnt > 0 ) {
1556                                 lr->lr_refcnt--;
1557
1558                         } else if ( lr->lr_refcnt < 0 ) {
1559                                 lr->lr_refcnt++;
1560                                 if ( lr->lr_refcnt == 0 ) {
1561                                         lr = NULL;
1562                                 }
1563                         }
1564                         break;
1565                 }
1566         }
1567         if ( lr == NULL ) {
1568                 ldap_free_request_int( ld, lrx );
1569
1570         } else if ( freeit ) {
1571                 ldap_free_request( ld, lrx );
1572         }
1573 #ifdef LDAP_R_COMPILE
1574         ldap_pvt_thread_mutex_unlock( &ld->ld_req_mutex );
1575 #endif
1576 }