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 1998-2012 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 /* used by ldap_send_server_request and ldap_new_connection */
  57 #ifdef LDAP_R_COMPILE
  58 #define LDAP_CONN_LOCK_IF(nolock) \
  59         { if (nolock) LDAP_MUTEX_LOCK( &ld->ld_conn_mutex ); }
  60 #define LDAP_CONN_UNLOCK_IF(nolock) \
  61         { if (nolock) LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex ); }
  62 #define LDAP_REQ_LOCK_IF(nolock) \
  63         { if (nolock) LDAP_MUTEX_LOCK( &ld->ld_req_mutex ); }
  64 #define LDAP_REQ_UNLOCK_IF(nolock) \
  65         { if (nolock) LDAP_MUTEX_UNLOCK( &ld->ld_req_mutex ); }
  66 #define LDAP_RES_LOCK_IF(nolock) \
  67         { if (nolock) LDAP_MUTEX_LOCK( &ld->ld_res_mutex ); }
  68 #define LDAP_RES_UNLOCK_IF(nolock) \
  69         { if (nolock) LDAP_MUTEX_UNLOCK( &ld->ld_res_mutex ); }
  70 #else
  71 #define LDAP_CONN_LOCK_IF(nolock)
  72 #define LDAP_CONN_UNLOCK_IF(nolock)
  73 #define LDAP_REQ_LOCK_IF(nolock)
  74 #define LDAP_REQ_UNLOCK_IF(nolock)
  75 #define LDAP_RES_LOCK_IF(nolock)
  76 #define LDAP_RES_UNLOCK_IF(nolock)
  77 #endif
  78
  79 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPURLDesc *srv, int any ));
  80 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  81 static void ldap_free_request_int LDAP_P(( LDAP *ld, LDAPRequest *lr ));
  82
  83 static BerElement *
  84 re_encode_request( LDAP *ld,
  85         BerElement *origber,
  86         ber_int_t msgid,
  87         int sref,
  88         LDAPURLDesc *srv,
  89         int *type );
  90
  91 BerElement *
  92 ldap_alloc_ber_with_options( LDAP *ld )
  93 {
  94         BerElement      *ber;
  95
  96         ber = ber_alloc_t( ld->ld_lberoptions );
  97         if ( ber == NULL ) {
  98                 ld->ld_errno = LDAP_NO_MEMORY;
  99         }
 100
 101         return( ber );
 102 }
 103
 104
 105 void
 106 ldap_set_ber_options( LDAP *ld, BerElement *ber )
 107 {
 108         /* ld_lberoptions is constant, hence no lock */
 109         ber->ber_options = ld->ld_lberoptions;
 110 }
 111
 112
 113 /* sets needed mutexes - no mutexes set to this point */
 114 ber_int_t
 115 ldap_send_initial_request(
 116         LDAP *ld,
 117         ber_tag_t msgtype,
 118         const char *dn,
 119         BerElement *ber,
 120         ber_int_t msgid)
 121 {
 122         int rc = 1;
 123         ber_socket_t sd = AC_SOCKET_INVALID;
 124
 125         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
 126
 127         LDAP_MUTEX_LOCK( &ld->ld_conn_mutex );
 128         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, &sd ) == -1 ) {
 129                 /* not connected yet */
 130                 rc = ldap_open_defconn( ld );
 131
 132         }
 133         if ( ld->ld_defconn && ld->ld_defconn->lconn_status == LDAP_CONNST_CONNECTING )
 134                 rc = ldap_int_check_async_open( ld, sd );
 135         if( rc < 0 ) {
 136                 ber_free( ber, 1 );
 137                 LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 138                 return( -1 );
 139         } else if ( rc == 0 ) {
 140                 Debug( LDAP_DEBUG_TRACE,
 141                         "ldap_open_defconn: successful\n",
 142                         0, 0, 0 );
 143         }
 144
 145 #ifdef LDAP_CONNECTIONLESS
 146         if (LDAP_IS_UDP(ld)) {
 147                 if (msgtype == LDAP_REQ_BIND) {
 148                         LDAP_MUTEX_LOCK( &ld->ld_options.ldo_mutex );
 149                         if (ld->ld_options.ldo_cldapdn)
 150                                 ldap_memfree(ld->ld_options.ldo_cldapdn);
 151                         ld->ld_options.ldo_cldapdn = ldap_strdup(dn);
 152                         ber_free( ber, 1 );
 153                         LDAP_MUTEX_UNLOCK( &ld->ld_options.ldo_mutex );
 154                         LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 155                         return 0;
 156                 }
 157                 if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
 158                 {
 159                         ber_free( ber, 1 );
 160                         LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 161                         return LDAP_PARAM_ERROR;
 162                 }
 163         }
 164 #endif
 165         LDAP_MUTEX_LOCK( &ld->ld_req_mutex );
 166         rc = ldap_send_server_request( ld, ber, msgid, NULL,
 167                 NULL, NULL, NULL, 0, 0 );
 168         LDAP_MUTEX_UNLOCK( &ld->ld_req_mutex );
 169         LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 170         return(rc);
 171 }
 172
 173
 174 /* protected by conn_mutex */
 175 int
 176 ldap_int_flush_request(
 177         LDAP *ld,
 178         LDAPRequest *lr )
 179 {
 180         LDAPConn *lc = lr->lr_conn;
 181
 182         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
 183         if ( ber_flush2( lc->lconn_sb, lr->lr_ber, LBER_FLUSH_FREE_NEVER ) != 0 ) {
 184                 if ( sock_errno() == EAGAIN ) {
 185                         /* need to continue write later */
 186                         lr->lr_status = LDAP_REQST_WRITING;
 187                         ldap_mark_select_write( ld, lc->lconn_sb );
 188                         ld->ld_errno = LDAP_BUSY;
 189                         return -2;
 190                 } else {
 191                         ld->ld_errno = LDAP_SERVER_DOWN;
 192                         ldap_free_request( ld, lr );
 193                         ldap_free_connection( ld, lc, 0, 0 );
 194                         return( -1 );
 195                 }
 196         } else {
 197                 if ( lr->lr_parent == NULL ) {
 198                         lr->lr_ber->ber_end = lr->lr_ber->ber_ptr;
 199                         lr->lr_ber->ber_ptr = lr->lr_ber->ber_buf;
 200                 }
 201                 lr->lr_status = LDAP_REQST_INPROGRESS;
 202
 203                 /* sent -- waiting for a response */
 204                 ldap_mark_select_read( ld, lc->lconn_sb );
 205                 ldap_clear_select_write( ld, lc->lconn_sb );
 206         }
 207         return 0;
 208 }
 209
 210 /*
 211  * protected by req_mutex
 212  * if m_noconn then protect using conn_lock
 213  * else already protected with conn_lock
 214  * if m_res then also protected by res_mutex
 215  */
 216
 217 int
 218 ldap_send_server_request(
 219         LDAP *ld,
 220         BerElement *ber,
 221         ber_int_t msgid,
 222         LDAPRequest *parentreq,
 223         LDAPURLDesc **srvlist,
 224         LDAPConn *lc,
 225         LDAPreqinfo *bind,
 226         int m_noconn,
 227         int m_res )
 228 {
 229         LDAPRequest     *lr;
 230         int             incparent, rc;
 231
 232         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 233         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 234
 235         incparent = 0;
 236         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 237
 238         LDAP_CONN_LOCK_IF(m_noconn);
 239         if ( lc == NULL ) {
 240                 if ( srvlist == NULL ) {
 241                         lc = ld->ld_defconn;
 242                 } else {
 243                         lc = find_connection( ld, *srvlist, 1 );
 244                         if ( lc == NULL ) {
 245                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 246                                         /* Remember the bind in the parent */
 247                                         incparent = 1;
 248                                         ++parentreq->lr_outrefcnt;
 249                                 }
 250                                 lc = ldap_new_connection( ld, srvlist, 0,
 251                                         1, bind, 1, m_res );
 252                         }
 253                 }
 254         }
 255
 256         /* async connect... */
 257         if ( lc != NULL && lc->lconn_status == LDAP_CONNST_CONNECTING ) {
 258                 ber_socket_t    sd = AC_SOCKET_ERROR;
 259                 struct timeval  tv = { 0 };
 260
 261                 ber_sockbuf_ctrl( lc->lconn_sb, LBER_SB_OPT_GET_FD, &sd );
 262
 263                 /* poll ... */
 264                 switch ( ldap_int_poll( ld, sd, &tv ) ) {
 265                 case 0:
 266                         /* go on! */
 267                         lc->lconn_status = LDAP_CONNST_CONNECTED;
 268                         break;
 269
 270                 case -2:
 271                         /* async only occurs if a network timeout is set */
 272
 273                         /* honor network timeout */
 274                         LDAP_MUTEX_LOCK( &ld->ld_options.ldo_mutex );
 275                         if ( time( NULL ) - lc->lconn_created <= ld->ld_options.ldo_tm_net.tv_sec )
 276                         {
 277                                 /* caller will have to call again */
 278                                 ld->ld_errno = LDAP_X_CONNECTING;
 279                         }
 280                         LDAP_MUTEX_UNLOCK( &ld->ld_options.ldo_mutex );
 281                         /* fallthru */
 282
 283                 default:
 284                         /* error */
 285                         break;
 286                 }
 287         }
 288
 289         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 290                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 291                         ld->ld_errno = LDAP_SERVER_DOWN;
 292                 }
 293
 294                 ber_free( ber, 1 );
 295                 if ( incparent ) {
 296                         /* Forget about the bind */
 297                         --parentreq->lr_outrefcnt;
 298                 }
 299                 LDAP_CONN_UNLOCK_IF(m_noconn);
 300                 return( -1 );
 301         }
 302
 303         use_connection( ld, lc );
 304
 305 #ifdef LDAP_CONNECTIONLESS
 306         if ( LDAP_IS_UDP( ld )) {
 307                 BerElement tmpber = *ber;
 308                 ber_rewind( &tmpber );
 309                 LDAP_MUTEX_LOCK( &ld->ld_options.ldo_mutex );
 310                 rc = ber_write( &tmpber, ld->ld_options.ldo_peer,
 311                         sizeof( struct sockaddr ), 0 );
 312                 LDAP_MUTEX_UNLOCK( &ld->ld_options.ldo_mutex );
 313                 if ( rc == -1 ) {
 314                         ld->ld_errno = LDAP_ENCODING_ERROR;
 315                         LDAP_CONN_UNLOCK_IF(m_noconn);
 316                         return rc;
 317                 }
 318         }
 319 #endif
 320
 321         /* If we still have an incomplete write, try to finish it before
 322          * dealing with the new request. If we don't finish here, return
 323          * LDAP_BUSY and let the caller retry later. We only allow a single
 324          * request to be in WRITING state.
 325          */
 326         rc = 0;
 327         if ( ld->ld_requests &&
 328                 ld->ld_requests->lr_status == LDAP_REQST_WRITING &&
 329                 ldap_int_flush_request( ld, ld->ld_requests ) < 0 )
 330         {
 331                 rc = -1;
 332         }
 333         if ( rc ) {
 334                 LDAP_CONN_UNLOCK_IF(m_noconn);
 335                 return rc;
 336         }
 337
 338         lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ) );
 339         if ( lr == NULL ) {
 340                 ld->ld_errno = LDAP_NO_MEMORY;
 341                 ldap_free_connection( ld, lc, 0, 0 );
 342                 ber_free( ber, 1 );
 343                 if ( incparent ) {
 344                         /* Forget about the bind */
 345                         --parentreq->lr_outrefcnt;
 346                 }
 347                 LDAP_CONN_UNLOCK_IF(m_noconn);
 348                 return( -1 );
 349         }
 350         lr->lr_msgid = msgid;
 351         lr->lr_status = LDAP_REQST_INPROGRESS;
 352         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 353         lr->lr_ber = ber;
 354         lr->lr_conn = lc;
 355         if ( parentreq != NULL ) {      /* sub-request */
 356                 if ( !incparent ) {
 357                         /* Increment if we didn't do it before the bind */
 358                         ++parentreq->lr_outrefcnt;
 359                 }
 360                 lr->lr_origid = parentreq->lr_origid;
 361                 lr->lr_parentcnt = ++parentreq->lr_parentcnt;
 362                 lr->lr_parent = parentreq;
 363                 lr->lr_refnext = parentreq->lr_child;
 364                 parentreq->lr_child = lr;
 365         } else {                        /* original request */
 366                 lr->lr_origid = lr->lr_msgid;
 367         }
 368
 369         /* Extract requestDN for future reference */
 370         {
 371                 BerElement tmpber = *ber;
 372                 ber_int_t       bint;
 373                 ber_tag_t       tag, rtag;
 374
 375                 ber_reset( &tmpber, 1 );
 376                 rtag = ber_scanf( &tmpber, "{it", /*}*/ &bint, &tag );
 377                 switch ( tag ) {
 378                 case LDAP_REQ_BIND:
 379                         rtag = ber_scanf( &tmpber, "{i" /*}*/, &bint );
 380                         break;
 381                 case LDAP_REQ_DELETE:
 382                         break;
 383                 default:
 384                         rtag = ber_scanf( &tmpber, "{" /*}*/ );
 385                 case LDAP_REQ_ABANDON:
 386                         break;
 387                 }
 388                 if ( tag != LDAP_REQ_ABANDON ) {
 389                         ber_skip_tag( &tmpber, &lr->lr_dn.bv_len );
 390                         lr->lr_dn.bv_val = tmpber.ber_ptr;
 391                 }
 392         }
 393
 394         lr->lr_prev = NULL;
 395         lr->lr_next = ld->ld_requests;
 396         if ( lr->lr_next != NULL ) {
 397                 lr->lr_next->lr_prev = lr;
 398         }
 399         ld->ld_requests = lr;
 400
 401         ld->ld_errno = LDAP_SUCCESS;
 402         if ( ldap_int_flush_request( ld, lr ) == -1 ) {
 403                 msgid = -1;
 404         }
 405
 406         LDAP_CONN_UNLOCK_IF(m_noconn);
 407         return( msgid );
 408 }
 409
 410 /* return 0 if no StartTLS ext, 1 if present, 2 if critical */
 411 static int
 412 find_tls_ext( LDAPURLDesc *srv )
 413 {
 414         int i, crit;
 415         char *ext;
 416
 417         if ( !srv->lud_exts )
 418                 return 0;
 419
 420         for (i=0; srv->lud_exts[i]; i++) {
 421                 crit = 0;
 422                 ext = srv->lud_exts[i];
 423                 if ( ext[0] == '!') {
 424                         ext++;
 425                         crit = 1;
 426                 }
 427                 if ( !strcasecmp( ext, "StartTLS" ) ||
 428                         !strcasecmp( ext, "X-StartTLS" ) ||
 429                         !strcmp( ext, LDAP_EXOP_START_TLS )) {
 430                         return crit + 1;
 431                 }
 432         }
 433         return 0;
 434 }
 435
 436 /*
 437  * always protected by conn_mutex
 438  * optionally protected by req_mutex and res_mutex
 439  */
 440 LDAPConn *
 441 ldap_new_connection( LDAP *ld, LDAPURLDesc **srvlist, int use_ldsb,
 442         int connect, LDAPreqinfo *bind, int m_req, int m_res )
 443 {
 444         LDAPConn        *lc;
 445         int             async = 0;
 446
 447         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
 448         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection %d %d %d\n",
 449                 use_ldsb, connect, (bind != NULL) );
 450         /*
 451          * make a new LDAP server connection
 452          * XXX open connection synchronously for now
 453          */
 454         lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ) );
 455         if ( lc == NULL ) {
 456                 ld->ld_errno = LDAP_NO_MEMORY;
 457                 return( NULL );
 458         }
 459
 460         if ( use_ldsb ) {
 461                 assert( ld->ld_sb != NULL );
 462                 lc->lconn_sb = ld->ld_sb;
 463
 464         } else {
 465                 lc->lconn_sb = ber_sockbuf_alloc();
 466                 if ( lc->lconn_sb == NULL ) {
 467                         LDAP_FREE( (char *)lc );
 468                         ld->ld_errno = LDAP_NO_MEMORY;
 469                         return( NULL );
 470                 }
 471         }
 472
 473         if ( connect ) {
 474                 LDAPURLDesc     **srvp, *srv = NULL;
 475
 476                 async = LDAP_BOOL_GET( &ld->ld_options, LDAP_BOOL_CONNECT_ASYNC );
 477
 478                 for ( srvp = srvlist; *srvp != NULL; srvp = &(*srvp)->lud_next ) {
 479                         int             rc;
 480
 481                         rc = ldap_int_open_connection( ld, lc, *srvp, async );
 482                         if ( rc != -1 ) {
 483                                 srv = *srvp;
 484
 485                                 if ( ld->ld_urllist_proc && ( !async || rc != -2 ) ) {
 486                                         ld->ld_urllist_proc( ld, srvlist, srvp, ld->ld_urllist_params );
 487                                 }
 488
 489                                 break;
 490                         }
 491                 }
 492
 493                 if ( srv == NULL ) {
 494                         if ( !use_ldsb ) {
 495                                 ber_sockbuf_free( lc->lconn_sb );
 496                         }
 497                         LDAP_FREE( (char *)lc );
 498                         ld->ld_errno = LDAP_SERVER_DOWN;
 499                         return( NULL );
 500                 }
 501
 502                 lc->lconn_server = ldap_url_dup( srv );
 503         }
 504
 505         lc->lconn_status = async ? LDAP_CONNST_CONNECTING : LDAP_CONNST_CONNECTED;
 506         lc->lconn_next = ld->ld_conns;
 507         ld->ld_conns = lc;
 508
 509         if ( connect ) {
 510 #ifdef HAVE_TLS
 511                 if ( lc->lconn_server->lud_exts ) {
 512                         int rc, ext = find_tls_ext( lc->lconn_server );
 513                         if ( ext ) {
 514                                 LDAPConn        *savedefconn;
 515
 516                                 savedefconn = ld->ld_defconn;
 517                                 ++lc->lconn_refcnt;     /* avoid premature free */
 518                                 ld->ld_defconn = lc;
 519
 520                                 LDAP_REQ_UNLOCK_IF(m_req);
 521                                 LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 522                                 LDAP_RES_UNLOCK_IF(m_res);
 523                                 rc = ldap_start_tls_s( ld, NULL, NULL );
 524                                 LDAP_RES_LOCK_IF(m_res);
 525                                 LDAP_MUTEX_LOCK( &ld->ld_conn_mutex );
 526                                 LDAP_REQ_LOCK_IF(m_req);
 527                                 ld->ld_defconn = savedefconn;
 528                                 --lc->lconn_refcnt;
 529
 530                                 if ( rc != LDAP_SUCCESS && ext == 2 ) {
 531                                         ldap_free_connection( ld, lc, 1, 0 );
 532                                         return NULL;
 533                                 }
 534                         }
 535                 }
 536 #endif
 537         }
 538
 539         if ( bind != NULL ) {
 540                 int             err = 0;
 541                 LDAPConn        *savedefconn;
 542
 543                 /* Set flag to prevent additional referrals
 544                  * from being processed on this
 545                  * connection until the bind has completed
 546                  */
 547                 lc->lconn_rebind_inprogress = 1;
 548                 /* V3 rebind function */
 549                 if ( ld->ld_rebind_proc != NULL) {
 550                         LDAPURLDesc     *srvfunc;
 551
 552                         srvfunc = ldap_url_dup( *srvlist );
 553                         if ( srvfunc == NULL ) {
 554                                 ld->ld_errno = LDAP_NO_MEMORY;
 555                                 err = -1;
 556                         } else {
 557                                 savedefconn = ld->ld_defconn;
 558                                 ++lc->lconn_refcnt;     /* avoid premature free */
 559                                 ld->ld_defconn = lc;
 560
 561                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 562                                 LDAP_REQ_UNLOCK_IF(m_req);
 563                                 LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 564                                 LDAP_RES_UNLOCK_IF(m_res);
 565                                 err = (*ld->ld_rebind_proc)( ld,
 566                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 567                                         ld->ld_rebind_params );
 568                                 LDAP_RES_LOCK_IF(m_res);
 569                                 LDAP_MUTEX_LOCK( &ld->ld_conn_mutex );
 570                                 LDAP_REQ_LOCK_IF(m_req);
 571
 572                                 ld->ld_defconn = savedefconn;
 573                                 --lc->lconn_refcnt;
 574
 575                                 if ( err != 0 ) {
 576                                         err = -1;
 577                                         ldap_free_connection( ld, lc, 1, 0 );
 578                                         lc = NULL;
 579                                 }
 580                                 ldap_free_urldesc( srvfunc );
 581                         }
 582
 583                 } else {
 584                         int             msgid, rc;
 585                         struct berval   passwd = BER_BVNULL;
 586
 587                         savedefconn = ld->ld_defconn;
 588                         ++lc->lconn_refcnt;     /* avoid premature free */
 589                         ld->ld_defconn = lc;
 590
 591                         Debug( LDAP_DEBUG_TRACE,
 592                                 "anonymous rebind via ldap_sasl_bind(\"\")\n",
 593                                 0, 0, 0);
 594
 595                         LDAP_REQ_UNLOCK_IF(m_req);
 596                         LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 597                         LDAP_RES_UNLOCK_IF(m_res);
 598                         rc = ldap_sasl_bind( ld, "", LDAP_SASL_SIMPLE, &passwd,
 599                                 NULL, NULL, &msgid );
 600                         if ( rc != LDAP_SUCCESS ) {
 601                                 err = -1;
 602
 603                         } else {
 604                                 for ( err = 1; err > 0; ) {
 605                                         struct timeval  tv = { 0, 100000 };
 606                                         LDAPMessage     *res = NULL;
 607
 608                                         switch ( ldap_result( ld, msgid, LDAP_MSG_ALL, &tv, &res ) ) {
 609                                         case -1:
 610                                                 err = -1;
 611                                                 break;
 612
 613                                         case 0:
 614 #ifdef LDAP_R_COMPILE
 615                                                 ldap_pvt_thread_yield();
 616 #endif
 617                                                 break;
 618
 619                                         case LDAP_RES_BIND:
 620                                                 rc = ldap_parse_result( ld, res, &err, NULL, NULL, NULL, NULL, 1 );
 621                                                 if ( rc != LDAP_SUCCESS ) {
 622                                                         err = -1;
 623
 624                                                 } else if ( err != LDAP_SUCCESS ) {
 625                                                         err = -1;
 626                                                 }
 627                                                 /* else err == LDAP_SUCCESS == 0 */
 628                                                 break;
 629
 630                                         default:
 631                                                 Debug( LDAP_DEBUG_TRACE,
 632                                                         "ldap_new_connection %p: "
 633                                                         "unexpected response %d "
 634                                                         "from BIND request id=%d\n",
 635                                                         (void *) ld, ldap_msgtype( res ), msgid );
 636                                                 err = -1;
 637                                                 break;
 638                                         }
 639                                 }
 640                         }
 641                         LDAP_RES_LOCK_IF(m_res);
 642                         LDAP_MUTEX_LOCK( &ld->ld_conn_mutex );
 643                         LDAP_REQ_LOCK_IF(m_req);
 644                         ld->ld_defconn = savedefconn;
 645                         --lc->lconn_refcnt;
 646
 647                         if ( err != 0 ) {
 648                                 ldap_free_connection( ld, lc, 1, 0 );
 649                                 lc = NULL;
 650                         }
 651                 }
 652                 if ( lc != NULL )
 653                         lc->lconn_rebind_inprogress = 0;
 654         }
 655         return( lc );
 656 }
 657
 658
 659 /* protected by ld_conn_mutex */
 660 static LDAPConn *
 661 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 662 /*
 663  * return an existing connection (if any) to the server srv
 664  * if "any" is non-zero, check for any server in the "srv" chain
 665  */
 666 {
 667         LDAPConn        *lc;
 668         LDAPURLDesc     *lcu, *lsu;
 669         int lcu_port, lsu_port;
 670         int found = 0;
 671
 672         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
 673         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 674                 lcu = lc->lconn_server;
 675                 lcu_port = ldap_pvt_url_scheme_port( lcu->lud_scheme,
 676                         lcu->lud_port );
 677
 678                 for ( lsu = srv; lsu != NULL; lsu = lsu->lud_next ) {
 679                         lsu_port = ldap_pvt_url_scheme_port( lsu->lud_scheme,
 680                                 lsu->lud_port );
 681
 682                         if ( lsu_port == lcu_port
 683                                 && strcmp( lcu->lud_scheme, lsu->lud_scheme ) == 0
 684                                 && lcu->lud_host != NULL && lsu->lud_host != NULL
 685                                 && strcasecmp( lsu->lud_host, lcu->lud_host ) == 0 )
 686                         {
 687                                 found = 1;
 688                                 break;
 689                         }
 690
 691                         if ( !any ) break;
 692                 }
 693                 if ( found )
 694                         break;
 695         }
 696         return lc;
 697 }
 698
 699
 700
 701 /* protected by ld_conn_mutex */
 702 static void
 703 use_connection( LDAP *ld, LDAPConn *lc )
 704 {
 705         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
 706         ++lc->lconn_refcnt;
 707         lc->lconn_lastused = time( NULL );
 708 }
 709
 710
 711 /* protected by ld_conn_mutex */
 712 void
 713 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 714 {
 715         LDAPConn        *tmplc, *prevlc;
 716
 717         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
 718         Debug( LDAP_DEBUG_TRACE,
 719                 "ldap_free_connection %d %d\n",
 720                 force, unbind, 0 );
 721
 722         if ( force || --lc->lconn_refcnt <= 0 ) {
 723                 /* remove from connections list first */
 724
 725                 for ( prevlc = NULL, tmplc = ld->ld_conns;
 726                         tmplc != NULL;
 727                         tmplc = tmplc->lconn_next )
 728                 {
 729                         if ( tmplc == lc ) {
 730                                 if ( prevlc == NULL ) {
 731                                     ld->ld_conns = tmplc->lconn_next;
 732                                 } else {
 733                                     prevlc->lconn_next = tmplc->lconn_next;
 734                                 }
 735                                 if ( ld->ld_defconn == lc ) {
 736                                         ld->ld_defconn = NULL;
 737                                 }
 738                                 break;
 739                         }
 740                         prevlc = tmplc;
 741                 }
 742
 743                 /* process connection callbacks */
 744                 {
 745                         struct ldapoptions *lo;
 746                         ldaplist *ll;
 747                         ldap_conncb *cb;
 748
 749                         lo = &ld->ld_options;
 750                         LDAP_MUTEX_LOCK( &lo->ldo_mutex );
 751                         if ( lo->ldo_conn_cbs ) {
 752                                 for ( ll=lo->ldo_conn_cbs; ll; ll=ll->ll_next ) {
 753                                         cb = ll->ll_data;
 754                                         cb->lc_del( ld, lc->lconn_sb, cb );
 755                                 }
 756                         }
 757                         LDAP_MUTEX_UNLOCK( &lo->ldo_mutex );
 758                         lo = LDAP_INT_GLOBAL_OPT();
 759                         LDAP_MUTEX_LOCK( &lo->ldo_mutex );
 760                         if ( lo->ldo_conn_cbs ) {
 761                                 for ( ll=lo->ldo_conn_cbs; ll; ll=ll->ll_next ) {
 762                                         cb = ll->ll_data;
 763                                         cb->lc_del( ld, lc->lconn_sb, cb );
 764                                 }
 765                         }
 766                         LDAP_MUTEX_UNLOCK( &lo->ldo_mutex );
 767                 }
 768
 769                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 770                         ldap_mark_select_clear( ld, lc->lconn_sb );
 771                         if ( unbind ) {
 772                                 ldap_send_unbind( ld, lc->lconn_sb,
 773                                                 NULL, NULL );
 774                         }
 775                 }
 776
 777                 if ( lc->lconn_ber != NULL ) {
 778                         ber_free( lc->lconn_ber, 1 );
 779                 }
 780
 781                 ldap_int_sasl_close( ld, lc );
 782 #ifdef HAVE_GSSAPI
 783                 ldap_int_gssapi_close( ld, lc );
 784 #endif
 785
 786                 ldap_free_urllist( lc->lconn_server );
 787
 788                 /* FIXME: is this at all possible?
 789                  * ldap_ld_free() in unbind.c calls ldap_free_connection()
 790                  * with force == 1 __after__ explicitly calling
 791                  * ldap_free_request() on all requests */
 792                 if ( force ) {
 793                         LDAPRequest     *lr;
 794
 795                         for ( lr = ld->ld_requests; lr; ) {
 796                                 LDAPRequest     *lr_next = lr->lr_next;
 797
 798                                 if ( lr->lr_conn == lc ) {
 799                                         ldap_free_request_int( ld, lr );
 800                                 }
 801
 802                                 lr = lr_next;
 803                         }
 804                 }
 805
 806                 if ( lc->lconn_sb != ld->ld_sb ) {
 807                         ber_sockbuf_free( lc->lconn_sb );
 808                 } else {
 809                         ber_int_sb_close( lc->lconn_sb );
 810                 }
 811
 812                 if ( lc->lconn_rebind_queue != NULL) {
 813                         int i;
 814                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 815                                 LDAP_VFREE( lc->lconn_rebind_queue[i] );
 816                         }
 817                         LDAP_FREE( lc->lconn_rebind_queue );
 818                 }
 819
 820                 LDAP_FREE( lc );
 821
 822                 Debug( LDAP_DEBUG_TRACE,
 823                         "ldap_free_connection: actually freed\n",
 824                         0, 0, 0 );
 825
 826         } else {
 827                 lc->lconn_lastused = time( NULL );
 828                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 829                                 lc->lconn_refcnt, 0, 0 );
 830         }
 831 }
 832
 833
 834 /* Protects self with ld_conn_mutex */
 835 #ifdef LDAP_DEBUG
 836 void
 837 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 838 {
 839         LDAPConn        *lc;
 840         char            timebuf[32];
 841
 842         Debug( LDAP_DEBUG_TRACE, "** ld %p Connection%s:\n", (void *)ld, all ? "s" : "", 0 );
 843         LDAP_MUTEX_LOCK( &ld->ld_conn_mutex );
 844         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 845                 if ( lc->lconn_server != NULL ) {
 846                         Debug( LDAP_DEBUG_TRACE, "* host: %s  port: %d%s\n",
 847                                 ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 848                                 : lc->lconn_server->lud_host,
 849                                 lc->lconn_server->lud_port, ( lc->lconn_sb ==
 850                                 ld->ld_sb ) ? "  (default)" : "" );
 851                 }
 852                 Debug( LDAP_DEBUG_TRACE, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 853                         ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET )
 854                                 ? "NeedSocket" :
 855                                 ( lc->lconn_status == LDAP_CONNST_CONNECTING )
 856                                         ? "Connecting" : "Connected", 0 );
 857                 Debug( LDAP_DEBUG_TRACE, "  last used: %s%s\n",
 858                         ldap_pvt_ctime( &lc->lconn_lastused, timebuf ),
 859                         lc->lconn_rebind_inprogress ? "  rebind in progress" : "", 0 );
 860                 if ( lc->lconn_rebind_inprogress ) {
 861                         if ( lc->lconn_rebind_queue != NULL) {
 862                                 int     i;
 863
 864                                 for ( i = 0; lc->lconn_rebind_queue[i] != NULL; i++ ) {
 865                                         int     j;
 866                                         for( j = 0; lc->lconn_rebind_queue[i][j] != 0; j++ ) {
 867                                                 Debug( LDAP_DEBUG_TRACE, "    queue %d entry %d - %s\n",
 868                                                         i, j, lc->lconn_rebind_queue[i][j] );
 869                                         }
 870                                 }
 871                         } else {
 872                                 Debug( LDAP_DEBUG_TRACE, "    queue is empty\n", 0, 0, 0 );
 873                         }
 874                 }
 875                 Debug( LDAP_DEBUG_TRACE, "\n", 0, 0, 0 );
 876                 if ( !all ) {
 877                         break;
 878                 }
 879         }
 880         LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
 881 }
 882
 883
 884 /* protected by req_mutex and res_mutex */
 885 void
 886 ldap_dump_requests_and_responses( LDAP *ld )
 887 {
 888         LDAPRequest     *lr;
 889         LDAPMessage     *lm, *l;
 890         int             i;
 891
 892         Debug( LDAP_DEBUG_TRACE, "** ld %p Outstanding Requests:\n",
 893                 (void *)ld, 0, 0 );
 894         lr = ld->ld_requests;
 895         if ( lr == NULL ) {
 896                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 897         }
 898         for ( i = 0; lr != NULL; lr = lr->lr_next, i++ ) {
 899                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  origid %d, status %s\n",
 900                         lr->lr_msgid, lr->lr_origid,
 901                         ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 902                         ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 903                         ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 904                         ( lr->lr_status == LDAP_REQST_WRITING ) ? "Writing" :
 905                         ( lr->lr_status == LDAP_REQST_COMPLETED ) ? "RequestCompleted"
 906                                 : "InvalidStatus" );
 907                 Debug( LDAP_DEBUG_TRACE, "   outstanding referrals %d, parent count %d\n",
 908                         lr->lr_outrefcnt, lr->lr_parentcnt, 0 );
 909         }
 910         Debug( LDAP_DEBUG_TRACE, "  ld %p request count %d (abandoned %lu)\n",
 911                 (void *)ld, i, ld->ld_nabandoned );
 912         Debug( LDAP_DEBUG_TRACE, "** ld %p Response Queue:\n", (void *)ld, 0, 0 );
 913         if ( ( lm = ld->ld_responses ) == NULL ) {
 914                 Debug( LDAP_DEBUG_TRACE, "   Empty\n", 0, 0, 0 );
 915         }
 916         for ( i = 0; lm != NULL; lm = lm->lm_next, i++ ) {
 917                 Debug( LDAP_DEBUG_TRACE, " * msgid %d,  type %lu\n",
 918                     lm->lm_msgid, (unsigned long)lm->lm_msgtype, 0 );
 919                 if ( lm->lm_chain != NULL ) {
 920                         Debug( LDAP_DEBUG_TRACE, "   chained responses:\n", 0, 0, 0 );
 921                         for ( l = lm->lm_chain; l != NULL; l = l->lm_chain ) {
 922                                 Debug( LDAP_DEBUG_TRACE,
 923                                         "  * msgid %d,  type %lu\n",
 924                                         l->lm_msgid,
 925                                         (unsigned long)l->lm_msgtype, 0 );
 926                         }
 927                 }
 928         }
 929         Debug( LDAP_DEBUG_TRACE, "  ld %p response count %d\n", (void *)ld, i, 0 );
 930 }
 931 #endif /* LDAP_DEBUG */
 932
 933 /* protected by req_mutex */
 934 static void
 935 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 936 {
 937         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 938         /* if lr_refcnt > 0, the request has been looked up
 939          * by ldap_find_request_by_msgid(); if in the meanwhile
 940          * the request is free()'d by someone else, just decrease
 941          * the reference count and extract it from the request
 942          * list; later on, it will be freed. */
 943         if ( lr->lr_prev == NULL ) {
 944                 if ( lr->lr_refcnt == 0 ) {
 945                         /* free'ing the first request? */
 946                         assert( ld->ld_requests == lr );
 947                 }
 948
 949                 if ( ld->ld_requests == lr ) {
 950                         ld->ld_requests = lr->lr_next;
 951                 }
 952
 953         } else {
 954                 lr->lr_prev->lr_next = lr->lr_next;
 955         }
 956
 957         if ( lr->lr_next != NULL ) {
 958                 lr->lr_next->lr_prev = lr->lr_prev;
 959         }
 960
 961         if ( lr->lr_refcnt > 0 ) {
 962                 lr->lr_refcnt = -lr->lr_refcnt;
 963
 964                 lr->lr_prev = NULL;
 965                 lr->lr_next = NULL;
 966
 967                 return;
 968         }
 969
 970         if ( lr->lr_ber != NULL ) {
 971                 ber_free( lr->lr_ber, 1 );
 972                 lr->lr_ber = NULL;
 973         }
 974
 975         if ( lr->lr_res_error != NULL ) {
 976                 LDAP_FREE( lr->lr_res_error );
 977                 lr->lr_res_error = NULL;
 978         }
 979
 980         if ( lr->lr_res_matched != NULL ) {
 981                 LDAP_FREE( lr->lr_res_matched );
 982                 lr->lr_res_matched = NULL;
 983         }
 984
 985         LDAP_FREE( lr );
 986 }
 987
 988 /* protected by req_mutex */
 989 void
 990 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 991 {
 992         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
 993         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 994                 lr->lr_origid, lr->lr_msgid, 0 );
 995
 996         /* free all referrals (child requests) */
 997         while ( lr->lr_child ) {
 998                 ldap_free_request( ld, lr->lr_child );
 999         }
1000
1001         if ( lr->lr_parent != NULL ) {
1002                 LDAPRequest     **lrp;
1003
1004                 --lr->lr_parent->lr_outrefcnt;
1005                 for ( lrp = &lr->lr_parent->lr_child;
1006                         *lrp && *lrp != lr;
1007                         lrp = &(*lrp)->lr_refnext );
1008
1009                 if ( *lrp == lr ) {
1010                         *lrp = lr->lr_refnext;
1011                 }
1012         }
1013         ldap_free_request_int( ld, lr );
1014 }
1015
1016 /*
1017  * call first time with *cntp = -1
1018  * when returns *cntp == -1, no referrals are left
1019  *
1020  * NOTE: may replace *refsp, or shuffle the contents
1021  * of the original array.
1022  */
1023 static int ldap_int_nextref(
1024         LDAP                    *ld,
1025         char                    ***refsp,
1026         int                     *cntp,
1027         void                    *params )
1028 {
1029         assert( refsp != NULL );
1030         assert( *refsp != NULL );
1031         assert( cntp != NULL );
1032
1033         if ( *cntp < -1 ) {
1034                 *cntp = -1;
1035                 return -1;
1036         }
1037
1038         (*cntp)++;
1039
1040         if ( (*refsp)[ *cntp ] == NULL ) {
1041                 *cntp = -1;
1042         }
1043
1044         return 0;
1045 }
1046
1047 /*
1048  * Chase v3 referrals
1049  *
1050  * Parameters:
1051  *  (IN) ld = LDAP connection handle
1052  *  (IN) lr = LDAP Request structure
1053  *  (IN) refs = array of pointers to referral strings that we will chase
1054  *              The array will be free'd by this function when no longer needed
1055  *  (IN) sref != 0 if following search reference
1056  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
1057  *  (OUT) hadrefp = 1 if sucessfully followed referral
1058  *
1059  * Return value - number of referrals followed
1060  *
1061  * Protected by res_mutex, conn_mutex and req_mutex     (try_read1msg)
1062  */
1063 int
1064 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
1065 {
1066         char            *unfollowed;
1067         int              unfollowedcnt = 0;
1068         LDAPRequest     *origreq;
1069         LDAPURLDesc     *srv = NULL;
1070         BerElement      *ber;
1071         char            **refarray = NULL;
1072         LDAPConn        *lc;
1073         int                      rc, count, i, j, id;
1074         LDAPreqinfo  rinfo;
1075         LDAP_NEXTREF_PROC       *nextref_proc = ld->ld_nextref_proc ? ld->ld_nextref_proc : ldap_int_nextref;
1076
1077         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_res_mutex );
1078         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
1079         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
1080         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
1081
1082         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1083         *hadrefp = 0;
1084
1085         unfollowed = NULL;
1086         rc = count = 0;
1087
1088         /* If no referrals in array, return */
1089         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
1090                 rc = 0;
1091                 goto done;
1092         }
1093
1094         /* Check for hop limit exceeded */
1095         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1096                 Debug( LDAP_DEBUG_ANY,
1097                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
1098                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
1099                 rc = -1;
1100                 goto done;
1101         }
1102
1103         /* find original request */
1104         for ( origreq = lr;
1105                 origreq->lr_parent != NULL;
1106                 origreq = origreq->lr_parent )
1107         {
1108                 /* empty */ ;
1109         }
1110
1111         refarray = refs;
1112         refs = NULL;
1113
1114         /* parse out & follow referrals */
1115         /* NOTE: if nextref_proc == ldap_int_nextref, params is ignored */
1116         i = -1;
1117         for ( nextref_proc( ld, &refarray, &i, ld->ld_nextref_params );
1118                         i != -1;
1119                         nextref_proc( ld, &refarray, &i, ld->ld_nextref_params ) )
1120         {
1121
1122                 /* Parse the referral URL */
1123                 rc = ldap_url_parse_ext( refarray[i], &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1124                 if ( rc != LDAP_URL_SUCCESS ) {
1125                         /* ldap_url_parse_ext() returns LDAP_URL_* errors
1126                          * which do not map on API errors */
1127                         ld->ld_errno = LDAP_PARAM_ERROR;
1128                         rc = -1;
1129                         goto done;
1130                 }
1131
1132                 if( srv->lud_crit_exts ) {
1133                         int ok = 0;
1134 #ifdef HAVE_TLS
1135                         /* If StartTLS is the only critical ext, OK. */
1136                         if ( find_tls_ext( srv ) == 2 && srv->lud_crit_exts == 1 )
1137                                 ok = 1;
1138 #endif
1139                         if ( !ok ) {
1140                                 /* we do not support any other extensions */
1141                                 ld->ld_errno = LDAP_NOT_SUPPORTED;
1142                                 rc = -1;
1143                                 goto done;
1144                         }
1145                 }
1146
1147                 /* check connection for re-bind in progress */
1148                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1149                         /* See if we've already requested this DN with this conn */
1150                         LDAPRequest *lp;
1151                         int looped = 0;
1152                         ber_len_t len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1153                         for ( lp = origreq; lp; ) {
1154                                 if ( lp->lr_conn == lc
1155                                         && len == lp->lr_dn.bv_len
1156                                         && len
1157                                         && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) == 0 )
1158                                 {
1159                                         looped = 1;
1160                                         break;
1161                                 }
1162                                 if ( lp == origreq ) {
1163                                         lp = lp->lr_child;
1164                                 } else {
1165                                         lp = lp->lr_refnext;
1166                                 }
1167                         }
1168                         if ( looped ) {
1169                                 ldap_free_urllist( srv );
1170                                 srv = NULL;
1171                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1172                                 rc = -1;
1173                                 continue;
1174                         }
1175
1176                         if ( lc->lconn_rebind_inprogress ) {
1177                                 /* We are already chasing a referral or search reference and a
1178                                  * bind on that connection is in progress.  We must queue
1179                                  * referrals on that connection, so we don't get a request
1180                                  * going out before the bind operation completes. This happens
1181                                  * if two search references come in one behind the other
1182                                  * for the same server with different contexts.
1183                                  */
1184                                 Debug( LDAP_DEBUG_TRACE,
1185                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
1186                                         refarray[i], 0, 0);
1187                                 if( lc->lconn_rebind_queue == NULL ) {
1188                                         /* Create a referral list */
1189                                         lc->lconn_rebind_queue =
1190                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
1191
1192                                         if( lc->lconn_rebind_queue == NULL) {
1193                                                 ld->ld_errno = LDAP_NO_MEMORY;
1194                                                 rc = -1;
1195                                                 goto done;
1196                                         }
1197
1198                                         lc->lconn_rebind_queue[0] = refarray;
1199                                         lc->lconn_rebind_queue[1] = NULL;
1200                                         refarray = NULL;
1201
1202                                 } else {
1203                                         /* Count how many referral arrays we already have */
1204                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
1205                                                 /* empty */;
1206                                         }
1207
1208                                         /* Add the new referral to the list */
1209                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
1210                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
1211
1212                                         if( lc->lconn_rebind_queue == NULL ) {
1213                                                 ld->ld_errno = LDAP_NO_MEMORY;
1214                                                 rc = -1;
1215                                                 goto done;
1216                                         }
1217                                         lc->lconn_rebind_queue[j] = refarray;
1218                                         lc->lconn_rebind_queue[j+1] = NULL;
1219                                         refarray = NULL;
1220                                 }
1221
1222                                 /* We have queued the referral/reference, now just return */
1223                                 rc = 0;
1224                                 *hadrefp = 1;
1225                                 count = 1; /* Pretend we already followed referral */
1226                                 goto done;
1227                         }
1228                 }
1229                 /* Re-encode the request with the new starting point of the search.
1230                  * Note: In the future we also need to replace the filter if one
1231                  * was provided with the search reference
1232                  */
1233
1234                 /* For references we don't want old dn if new dn empty */
1235                 if ( sref && srv->lud_dn == NULL ) {
1236                         srv->lud_dn = LDAP_STRDUP( "" );
1237                 }
1238
1239                 LDAP_NEXT_MSGID( ld, id );
1240                 ber = re_encode_request( ld, origreq->lr_ber, id,
1241                         sref, srv, &rinfo.ri_request );
1242
1243                 if( ber == NULL ) {
1244                         ld->ld_errno = LDAP_ENCODING_ERROR;
1245                         rc = -1;
1246                         goto done;
1247                 }
1248
1249                 Debug( LDAP_DEBUG_TRACE,
1250                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
1251                         lr->lr_msgid, refarray[i], 0);
1252
1253                 /* Send the new request to the server - may require a bind */
1254                 rinfo.ri_msgid = origreq->lr_origid;
1255                 rinfo.ri_url = refarray[i];
1256                 rc = ldap_send_server_request( ld, ber, id,
1257                         origreq, &srv, NULL, &rinfo, 0, 1 );
1258                 if ( rc < 0 ) {
1259                         /* Failure, try next referral in the list */
1260                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%d: %s)\n",
1261                                 refarray[i], ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1262                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i] );
1263                         ldap_free_urllist( srv );
1264                         srv = NULL;
1265                         ld->ld_errno = LDAP_REFERRAL;
1266                 } else {
1267                         /* Success, no need to try this referral list further */
1268                         rc = 0;
1269                         ++count;
1270                         *hadrefp = 1;
1271
1272                         /* check if there is a queue of referrals that came in during bind */
1273                         if ( lc == NULL) {
1274                                 lc = find_connection( ld, srv, 1 );
1275                                 if ( lc == NULL ) {
1276                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
1277                                         rc = -1;
1278                                         LDAP_MUTEX_UNLOCK( &ld->ld_conn_mutex );
1279                                         goto done;
1280                                 }
1281                         }
1282
1283                         if ( lc->lconn_rebind_queue != NULL ) {
1284                                 /* Release resources of previous list */
1285                                 LDAP_VFREE( refarray );
1286                                 refarray = NULL;
1287                                 ldap_free_urllist( srv );
1288                                 srv = NULL;
1289
1290                                 /* Pull entries off end of queue so list always null terminated */
1291                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++ )
1292                                         ;
1293                                 refarray = lc->lconn_rebind_queue[j - 1];
1294                                 lc->lconn_rebind_queue[j-1] = NULL;
1295                                 /* we pulled off last entry from queue, free queue */
1296                                 if ( j == 1 ) {
1297                                         LDAP_FREE( lc->lconn_rebind_queue );
1298                                         lc->lconn_rebind_queue = NULL;
1299                                 }
1300                                 /* restart the loop the with new referral list */
1301                                 i = -1;
1302                                 continue;
1303                         }
1304                         break; /* referral followed, break out of for loop */
1305                 }
1306         } /* end for loop */
1307 done:
1308         LDAP_VFREE( refarray );
1309         ldap_free_urllist( srv );
1310         LDAP_FREE( *errstrp );
1311
1312         if( rc == 0 ) {
1313                 *errstrp = NULL;
1314                 LDAP_FREE( unfollowed );
1315                 return count;
1316         } else {
1317                 *errstrp = unfollowed;
1318                 return rc;
1319         }
1320 }
1321
1322 /*
1323  * XXX merging of errors in this routine needs to be improved
1324  * Protected by res_mutex, conn_mutex and req_mutex     (try_read1msg)
1325  */
1326 int
1327 ldap_chase_referrals( LDAP *ld,
1328         LDAPRequest *lr,
1329         char **errstrp,
1330         int sref,
1331         int *hadrefp )
1332 {
1333         int             rc, count, id;
1334         unsigned        len;
1335         char            *p, *ref, *unfollowed;
1336         LDAPRequest     *origreq;
1337         LDAPURLDesc     *srv;
1338         BerElement      *ber;
1339         LDAPreqinfo  rinfo;
1340         LDAPConn        *lc;
1341
1342         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_res_mutex );
1343         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_conn_mutex );
1344         LDAP_ASSERT_MUTEX_OWNER( &ld->ld_req_mutex );
1345         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
1346
1347         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
1348         *hadrefp = 0;
1349
1350         if ( *errstrp == NULL ) {
1351                 return( 0 );
1352         }
1353
1354         len = strlen( *errstrp );
1355         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
1356                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
1357                         *p = '\0';
1358                         p += LDAP_REF_STR_LEN;
1359                         break;
1360                 }
1361         }
1362
1363         if ( len < LDAP_REF_STR_LEN ) {
1364                 return( 0 );
1365         }
1366
1367         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
1368                 Debug( LDAP_DEBUG_ANY,
1369                     "more than %d referral hops (dropping)\n",
1370                     ld->ld_refhoplimit, 0, 0 );
1371                     /* XXX report as error in ld->ld_errno? */
1372                     return( 0 );
1373         }
1374
1375         /* find original request */
1376         for ( origreq = lr; origreq->lr_parent != NULL;
1377              origreq = origreq->lr_parent ) {
1378                 /* empty */;
1379         }
1380
1381         unfollowed = NULL;
1382         rc = count = 0;
1383
1384         /* parse out & follow referrals */
1385         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
1386                 p = strchr( ref, '\n' );
1387                 if ( p != NULL ) {
1388                         *p++ = '\0';
1389                 }
1390
1391                 rc = ldap_url_parse_ext( ref, &srv, LDAP_PVT_URL_PARSE_NOEMPTY_DN );
1392                 if ( rc != LDAP_URL_SUCCESS ) {
1393                         Debug( LDAP_DEBUG_TRACE,
1394                                 "ignoring %s referral <%s>\n",
1395                                 ref, rc == LDAP_URL_ERR_BADSCHEME ? "unknown" : "incorrect", 0 );
1396                         rc = ldap_append_referral( ld, &unfollowed, ref );
1397                         *hadrefp = 1;
1398                         continue;
1399                 }
1400
1401                 Debug( LDAP_DEBUG_TRACE,
1402                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
1403
1404                 *hadrefp = 1;
1405
1406                 /* See if we've already been here */
1407                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
1408                         LDAPRequest *lp;
1409                         int looped = 0;
1410                         ber_len_t len = srv->lud_dn ? strlen( srv->lud_dn ) : 0;
1411                         for ( lp = lr; lp; lp = lp->lr_parent ) {
1412                                 if ( lp->lr_conn == lc
1413                                         && len == lp->lr_dn.bv_len )
1414                                 {
1415                                         if ( len && strncmp( srv->lud_dn, lp->lr_dn.bv_val, len ) )
1416                                                         continue;
1417                                         looped = 1;
1418                                         break;
1419                                 }
1420                         }
1421                         if ( looped ) {
1422                                 ldap_free_urllist( srv );
1423                                 ld->ld_errno = LDAP_CLIENT_LOOP;
1424                                 rc = -1;
1425                                 continue;
1426                         }
1427                 }
1428
1429                 LDAP_NEXT_MSGID( ld, id );
1430                 ber = re_encode_request( ld, origreq->lr_ber,
1431                     id, sref, srv, &rinfo.ri_request );
1432
1433                 if ( ber == NULL ) {
1434                         return -1 ;
1435                 }
1436
1437                 /* copy the complete referral for rebind process */
1438                 rinfo.ri_url = LDAP_STRDUP( ref );
1439
1440                 rinfo.ri_msgid = origreq->lr_origid;
1441
1442                 rc = ldap_send_server_request( ld, ber, id,
1443                         lr, &srv, NULL, &rinfo, 0, 1 );
1444                 LDAP_FREE( rinfo.ri_url );
1445
1446                 if( rc >= 0 ) {
1447                         ++count;
1448                 } else {
1449                         Debug( LDAP_DEBUG_ANY,
1450                                 "Unable to chase referral \"%s\" (%d: %s)\n",
1451                                 ref, ld->ld_errno, ldap_err2string( ld->ld_errno ) );
1452                         rc = ldap_append_referral( ld, &unfollowed, ref );
1453                 }
1454
1455                 ldap_free_urllist(srv);
1456         }
1457
1458         LDAP_FREE( *errstrp );
1459         *errstrp = unfollowed;
1460
1461         return(( rc == 0 ) ? count : rc );
1462 }
1463
1464
1465 int
1466 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
1467 {
1468         int     first;
1469
1470         if ( *referralsp == NULL ) {
1471                 first = 1;
1472                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
1473                     + 1 );
1474         } else {
1475                 first = 0;
1476                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
1477                     strlen( *referralsp ) + strlen( s ) + 2 );
1478         }
1479
1480         if ( *referralsp == NULL ) {
1481                 ld->ld_errno = LDAP_NO_MEMORY;
1482                 return( -1 );
1483         }
1484
1485         if ( first ) {
1486                 strcpy( *referralsp, LDAP_REF_STR );
1487         } else {
1488                 strcat( *referralsp, "\n" );
1489         }
1490         strcat( *referralsp, s );
1491
1492         return( 0 );
1493 }
1494
1495
1496
1497 static BerElement *
1498 re_encode_request( LDAP *ld,
1499         BerElement *origber,
1500         ber_int_t msgid,
1501         int sref,
1502         LDAPURLDesc *srv,
1503         int *type )
1504 {
1505         /*
1506          * XXX this routine knows way too much about how the lber library works!
1507          */
1508         ber_int_t       along;
1509         ber_tag_t       tag;
1510         ber_tag_t       rtag;
1511         ber_int_t       ver;
1512         ber_int_t       scope;
1513         int             rc;
1514         BerElement      tmpber, *ber;
1515         struct berval           dn;
1516
1517         Debug( LDAP_DEBUG_TRACE,
1518             "re_encode_request: new msgid %ld, new dn <%s>\n",
1519             (long) msgid,
1520                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
1521
1522         tmpber = *origber;
1523
1524         /*
1525          * all LDAP requests are sequences that start with a message id.
1526          * For all except delete, this is followed by a sequence that is
1527          * tagged with the operation code.  For delete, the provided DN
1528          * is not wrapped by a sequence.
1529          */
1530         rtag = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1531
1532         if ( rtag == LBER_ERROR ) {
1533                 ld->ld_errno = LDAP_DECODING_ERROR;
1534                 return( NULL );
1535         }
1536
1537         assert( tag != 0);
1538         if ( tag == LDAP_REQ_BIND ) {
1539                 /* bind requests have a version number before the DN & other stuff */
1540                 rtag = ber_scanf( &tmpber, "{im" /*}*/, &ver, &dn );
1541
1542         } else if ( tag == LDAP_REQ_DELETE ) {
1543                 /* delete requests don't have a DN wrapping sequence */
1544                 rtag = ber_scanf( &tmpber, "m", &dn );
1545
1546         } else if ( tag == LDAP_REQ_SEARCH ) {
1547                 /* search requests need to be re-scope-ed */
1548                 rtag = ber_scanf( &tmpber, "{me" /*"}"*/, &dn, &scope );
1549
1550                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1551                         /* use the scope provided in reference */
1552                         scope = srv->lud_scope;
1553
1554                 } else if ( sref ) {
1555                         /* use scope implied by previous operation
1556                          *   base -> base
1557                          *   one -> base
1558                          *   subtree -> subtree
1559                          *   subordinate -> subtree
1560                          */
1561                         switch( scope ) {
1562                         default:
1563                         case LDAP_SCOPE_BASE:
1564                         case LDAP_SCOPE_ONELEVEL:
1565                                 scope = LDAP_SCOPE_BASE;
1566                                 break;
1567                         case LDAP_SCOPE_SUBTREE:
1568                         case LDAP_SCOPE_SUBORDINATE:
1569                                 scope = LDAP_SCOPE_SUBTREE;
1570                                 break;
1571                         }
1572                 }
1573
1574         } else {
1575                 rtag = ber_scanf( &tmpber, "{m" /*}*/, &dn );
1576         }
1577
1578         if( rtag == LBER_ERROR ) {
1579                 ld->ld_errno = LDAP_DECODING_ERROR;
1580                 return NULL;
1581         }
1582
1583         /* restore character zero'd out by ber_scanf*/
1584         dn.bv_val[dn.bv_len] = tmpber.ber_tag;
1585
1586         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1587                 return NULL;
1588         }
1589
1590         if ( srv->lud_dn ) {
1591                 ber_str2bv( srv->lud_dn, 0, 0, &dn );
1592         }
1593
1594         if ( tag == LDAP_REQ_BIND ) {
1595                 rc = ber_printf( ber, "{it{iO" /*}}*/, msgid, tag, ver, &dn );
1596         } else if ( tag == LDAP_REQ_DELETE ) {
1597                 rc = ber_printf( ber, "{itON}", msgid, tag, &dn );
1598         } else if ( tag == LDAP_REQ_SEARCH ) {
1599                 rc = ber_printf( ber, "{it{Oe" /*}}*/, msgid, tag, &dn, scope );
1600         } else {
1601                 rc = ber_printf( ber, "{it{O" /*}}*/, msgid, tag, &dn );
1602         }
1603
1604         if ( rc == -1 ) {
1605                 ld->ld_errno = LDAP_ENCODING_ERROR;
1606                 ber_free( ber, 1 );
1607                 return NULL;
1608         }
1609
1610         if ( tag != LDAP_REQ_DELETE && (
1611                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1612                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1613             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1614         {
1615                 ld->ld_errno = LDAP_ENCODING_ERROR;
1616                 ber_free( ber, 1 );
1617                 return NULL;
1618         }
1619
1620 #ifdef LDAP_DEBUG
1621         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1622                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1623                     0, 0, 0 );
1624                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1625         }
1626 #endif /* LDAP_DEBUG */
1627
1628         *type = tag;    /* return request type */
1629         return ber;
1630 }
1631
1632
1633 /* protected by req_mutex */
1634 LDAPRequest *
1635 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1636 {
1637         LDAPRequest     *lr;
1638
1639         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1640                 if ( lr->lr_status == LDAP_REQST_COMPLETED ) {
1641                         continue;       /* Skip completed requests */
1642                 }
1643                 if ( msgid == lr->lr_msgid ) {
1644                         lr->lr_refcnt++;
1645                         break;
1646                 }
1647         }
1648
1649         return( lr );
1650 }
1651
1652 /* protected by req_mutex */
1653 void
1654 ldap_return_request( LDAP *ld, LDAPRequest *lrx, int freeit )
1655 {
1656         LDAPRequest     *lr;
1657
1658         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1659                 if ( lr == lrx ) {
1660                         if ( lr->lr_refcnt > 0 ) {
1661                                 lr->lr_refcnt--;
1662
1663                         } else if ( lr->lr_refcnt < 0 ) {
1664                                 lr->lr_refcnt++;
1665                                 if ( lr->lr_refcnt == 0 ) {
1666                                         lr = NULL;
1667                                 }
1668                         }
1669                         break;
1670                 }
1671         }
1672         if ( lr == NULL ) {
1673                 ldap_free_request_int( ld, lrx );
1674
1675         } else if ( freeit ) {
1676                 ldap_free_request( ld, lrx );
1677         }
1678 }