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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6 /*  Portions
   7  *  Copyright (c) 1995 Regents of the University of Michigan.
   8  *  All rights reserved.
   9  */
  10 /*---
  11  * This notice applies to changes, created by or for Novell, Inc.,
  12  * to preexisting works for which notices appear elsewhere in this file.
  13  *
  14  * Copyright (C) 1999, 2000 Novell, Inc. All Rights Reserved.
  15  *
  16  * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND TREATIES.
  17  * USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT TO VERSION
  18  * 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS AVAILABLE AT
  19  * HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE" IN THE
  20  * TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION OF THIS
  21  * WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP PUBLIC
  22  * LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT THE
  23  * PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
  24  *---
  25  * Modification to OpenLDAP source by Novell, Inc.
  26  * April 2000 sfs  Added code to chase V3 referrals
  27  *  request.c - sending of ldap requests; handling of referrals
  28  */
  29
  30 #include "portable.h"
  31
  32 #include <stdio.h>
  33
  34 #include <ac/stdlib.h>
  35
  36 #include <ac/errno.h>
  37 #include <ac/socket.h>
  38 #include <ac/string.h>
  39 #include <ac/time.h>
  40 #include <ac/unistd.h>
  41
  42 #include "ldap-int.h"
  43 #include "lber.h"
  44
  45 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPURLDesc *srv, int any ));
  46 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  47
  48 static BerElement *
  49 re_encode_request( LDAP *ld,
  50         BerElement *origber,
  51         ber_int_t msgid,
  52         int sref,
  53         LDAPURLDesc *srv,
  54         int *type );
  55
  56 BerElement *
  57 ldap_alloc_ber_with_options( LDAP *ld )
  58 {
  59         BerElement      *ber;
  60
  61     if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULL ) {
  62                 ld->ld_errno = LDAP_NO_MEMORY;
  63         }
  64
  65         return( ber );
  66 }
  67
  68
  69 void
  70 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  71 {
  72         ber->ber_options = ld->ld_lberoptions;
  73 }
  74
  75
  76 ber_int_t
  77 ldap_send_initial_request(
  78         LDAP *ld,
  79         ber_tag_t msgtype,
  80         const char *dn,
  81         BerElement *ber )
  82 {
  83         LDAPURLDesc     *servers;
  84         int rc;
  85
  86         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
  87
  88         if ( ber_sockbuf_ctrl( ld->ld_sb, LBER_SB_OPT_GET_FD, NULL ) == -1 ) {
  89                 /* not connected yet */
  90                 int rc = ldap_open_defconn( ld );
  91
  92                 if( rc < 0 ) {
  93                         ber_free( ber, 1 );
  94                         return( -1 );
  95                 }
  96
  97                 Debug( LDAP_DEBUG_TRACE,
  98                         "ldap_open_defconn: successful\n",
  99                         0, 0, 0 );
 100         }
 101
 102         {
 103                 /*
 104                  * use of DNS is turned off or this is an X.500 DN...
 105                  * use our default connection
 106                  */
 107                 servers = NULL;
 108         }
 109
 110 #ifdef LDAP_CONNECTIONLESS
 111         if (LDAP_IS_UDP(ld)) {
 112                 if (msgtype == LDAP_REQ_BIND) {
 113                         if (ld->ld_options.ldo_cldapdn)
 114                                 ldap_memfree(ld->ld_options.ldo_cldapdn);
 115                         ld->ld_options.ldo_cldapdn = ldap_strdup(dn);
 116                         return 0;
 117                 }
 118                 if (msgtype != LDAP_REQ_ABANDON && msgtype != LDAP_REQ_SEARCH)
 119                         return LDAP_PARAM_ERROR;
 120         }
 121 #endif
 122         rc = ldap_send_server_request( ld, ber, ld->ld_msgid, NULL,
 123                                                                         servers, NULL, NULL );
 124         if (servers)
 125                 ldap_free_urllist(servers);
 126         return(rc);
 127 }
 128
 129
 130
 131 int
 132 ldap_send_server_request(
 133         LDAP *ld,
 134         BerElement *ber,
 135         ber_int_t msgid,
 136         LDAPRequest *parentreq,
 137         LDAPURLDesc *srvlist,
 138         LDAPConn *lc,
 139         LDAPreqinfo *bind )
 140 {
 141         LDAPRequest     *lr;
 142         int incparent;
 143
 144         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 145
 146         incparent = 0;
 147         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 148
 149         if ( lc == NULL ) {
 150                 if ( srvlist == NULL ) {
 151                         lc = ld->ld_defconn;
 152                 } else {
 153                         if (( lc = find_connection( ld, srvlist, 1 )) ==
 154                             NULL ) {
 155                                 if ( (bind != NULL) && (parentreq != NULL) ) {
 156                                         /* Remember the bind in the parent */
 157                                         incparent = 1;
 158                                         ++parentreq->lr_outrefcnt;
 159                                 }
 160                                 lc = ldap_new_connection( ld, srvlist, 0, 1, bind );
 161                         }
 162                 }
 163         }
 164
 165         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 166                 ber_free( ber, 1 );
 167                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 168                         ld->ld_errno = LDAP_SERVER_DOWN;
 169                 }
 170                 if ( incparent ) {
 171                         /* Forget about the bind */
 172                         --parentreq->lr_outrefcnt;
 173                 }
 174                 return( -1 );
 175         }
 176
 177         use_connection( ld, lc );
 178         if (( lr = (LDAPRequest *)LDAP_CALLOC( 1, sizeof( LDAPRequest ))) ==
 179             NULL ) {
 180                 ld->ld_errno = LDAP_NO_MEMORY;
 181                 ldap_free_connection( ld, lc, 0, 0 );
 182                 ber_free( ber, 1 );
 183                 if ( incparent ) {
 184                         /* Forget about the bind */
 185                         --parentreq->lr_outrefcnt;
 186                 }
 187                 return( -1 );
 188         }
 189         lr->lr_msgid = msgid;
 190         lr->lr_status = LDAP_REQST_INPROGRESS;
 191         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 192         lr->lr_ber = ber;
 193         lr->lr_conn = lc;
 194         if ( parentreq != NULL ) {      /* sub-request */
 195                 if ( !incparent ) {
 196                         /* Increment if we didn't do it before the bind */
 197                         ++parentreq->lr_outrefcnt;
 198                 }
 199                 lr->lr_origid = parentreq->lr_origid;
 200                 lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
 201                 lr->lr_parent = parentreq;
 202                 lr->lr_refnext = parentreq->lr_child;
 203                 parentreq->lr_child = lr;
 204         } else {                        /* original request */
 205                 lr->lr_origid = lr->lr_msgid;
 206         }
 207
 208         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 209                 lr->lr_next->lr_prev = lr;
 210         }
 211         ld->ld_requests = lr;
 212         lr->lr_prev = NULL;
 213
 214         if ( ber_flush( lc->lconn_sb, ber, 0 ) != 0 ) {
 215 #ifdef notyet
 216                 if ( errno == EWOULDBLOCK ) {
 217                         /* need to continue write later */
 218                         lr->lr_status = LDAP_REQST_WRITING;
 219                         ldap_mark_select_write( ld, lc->lconn_sb );
 220                 } else {
 221 #else /* notyet */
 222                         ld->ld_errno = LDAP_SERVER_DOWN;
 223                         ldap_free_request( ld, lr );
 224                         ldap_free_connection( ld, lc, 0, 0 );
 225                         return( -1 );
 226 #endif /* notyet */
 227 #ifdef notyet
 228                 }
 229 #endif /* notyet */
 230         } else {
 231                 if ( parentreq == NULL ) {
 232                         ber->ber_end = ber->ber_ptr;
 233                         ber->ber_ptr = ber->ber_buf;
 234                 }
 235
 236                 /* sent -- waiting for a response */
 237                 ldap_mark_select_read( ld, lc->lconn_sb );
 238         }
 239
 240         ld->ld_errno = LDAP_SUCCESS;
 241         return( msgid );
 242 }
 243
 244 LDAPConn *
 245 ldap_new_connection( LDAP *ld, LDAPURLDesc *srvlist, int use_ldsb,
 246         int connect, LDAPreqinfo *bind )
 247 {
 248         LDAPConn        *lc;
 249         LDAPURLDesc     *srv;
 250         Sockbuf         *sb = NULL;
 251
 252         Debug( LDAP_DEBUG_TRACE, "ldap_new_connection\n", 0, 0, 0 );
 253         /*
 254          * make a new LDAP server connection
 255          * XXX open connection synchronously for now
 256          */
 257         if (( lc = (LDAPConn *)LDAP_CALLOC( 1, sizeof( LDAPConn ))) == NULL ||
 258             ( !use_ldsb && ( (sb = ber_sockbuf_alloc()) == NULL ))) {
 259                 if ( lc != NULL ) {
 260                         LDAP_FREE( (char *)lc );
 261                 }
 262                 ld->ld_errno = LDAP_NO_MEMORY;
 263                 return( NULL );
 264         }
 265
 266         lc->lconn_sb = ( use_ldsb ) ? ld->ld_sb : sb;
 267
 268         if ( connect ) {
 269                 for ( srv = srvlist; srv != NULL; srv = srv->lud_next ) {
 270                         if ( ldap_int_open_connection( ld, lc, srv, 0 ) != -1 ) {
 271                                 break;
 272                         }
 273                 }
 274
 275                 if ( srv == NULL ) {
 276                         if ( !use_ldsb ) {
 277                                 ber_sockbuf_free( lc->lconn_sb );
 278                         }
 279                     LDAP_FREE( (char *)lc );
 280                     ld->ld_errno = LDAP_SERVER_DOWN;
 281                     return( NULL );
 282                 }
 283
 284                 lc->lconn_server = ldap_url_dup(srv);
 285         }
 286
 287         lc->lconn_status = LDAP_CONNST_CONNECTED;
 288         lc->lconn_next = ld->ld_conns;
 289         ld->ld_conns = lc;
 290
 291         /*
 292          * XXX for now, we always do a synchronous bind.  This will have
 293          * to change in the long run...
 294          */
 295         if ( bind != NULL) {
 296                 int             err = 0;
 297                 LDAPConn        *savedefconn;
 298
 299                 /* Set flag to prevent additional referrals from being processed on this
 300                  * connection until the bind has completed
 301                  */
 302                 lc->lconn_rebind_inprogress = 1;
 303                 /* V3 rebind function */
 304                 if ( ld->ld_rebind_proc != NULL) {
 305                         LDAPURLDesc     *srvfunc;
 306                         if( ( srvfunc = ldap_url_dup( srvlist)) == NULL) {
 307                                 ld->ld_errno = LDAP_NO_MEMORY;
 308                                 err = -1;
 309                         } else {
 310                                 savedefconn = ld->ld_defconn;
 311                                 ++lc->lconn_refcnt;     /* avoid premature free */
 312                                 ld->ld_defconn = lc;
 313
 314                                 Debug( LDAP_DEBUG_TRACE, "Call application rebind_proc\n", 0, 0, 0);
 315                                 err = (*ld->ld_rebind_proc)( ld,
 316                                         bind->ri_url, bind->ri_request, bind->ri_msgid,
 317                                         ld->ld_rebind_params );
 318
 319                                 ld->ld_defconn = savedefconn;
 320                                 --lc->lconn_refcnt;
 321
 322                                 if( err != 0) {
 323                                 err = -1;
 324                                         ldap_free_connection( ld, lc, 1, 0 );
 325                                         lc = NULL;
 326                         }
 327                                 ldap_free_urldesc( srvfunc);
 328                 }
 329                 } else {
 330                         savedefconn = ld->ld_defconn;
 331                         ++lc->lconn_refcnt;     /* avoid premature free */
 332                         ld->ld_defconn = lc;
 333
 334                         Debug( LDAP_DEBUG_TRACE, "anonymous rebind via ldap_bind_s\n", 0, 0, 0);
 335                         if ( ldap_bind_s( ld, "", "", LDAP_AUTH_SIMPLE ) != LDAP_SUCCESS ) {
 336                                 err = -1;
 337                         }
 338                         ld->ld_defconn = savedefconn;
 339                         --lc->lconn_refcnt;
 340
 341                 if ( err != 0 ) {
 342                         ldap_free_connection( ld, lc, 1, 0 );
 343                         lc = NULL;
 344                 }
 345         }
 346                 if( lc != NULL)
 347                         lc->lconn_rebind_inprogress = 0;
 348         }
 349
 350         return( lc );
 351 }
 352
 353
 354 static LDAPConn *
 355 find_connection( LDAP *ld, LDAPURLDesc *srv, int any )
 356 /*
 357  * return an existing connection (if any) to the server srv
 358  * if "any" is non-zero, check for any server in the "srv" chain
 359  */
 360 {
 361         LDAPConn        *lc;
 362         LDAPURLDesc     *ls;
 363
 364         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 365                 for ( ls = srv; ls != NULL; ls = ls->lud_next ) {
 366                         if ( lc->lconn_server->lud_host != NULL &&
 367                                 *lc->lconn_server->lud_host != '\0' &&
 368                             ls->lud_host != NULL && *ls->lud_host != '\0' &&
 369                                 strcasecmp( ls->lud_host, lc->lconn_server->lud_host ) == 0
 370                             && ls->lud_port == lc->lconn_server->lud_port ) {
 371                                 return lc;
 372                         }
 373                         if ( !any ) {
 374                                 break;
 375                         }
 376                 }
 377         }
 378
 379         return NULL;
 380 }
 381
 382
 383
 384 static void
 385 use_connection( LDAP *ld, LDAPConn *lc )
 386 {
 387         ++lc->lconn_refcnt;
 388         lc->lconn_lastused = time( NULL );
 389 }
 390
 391
 392 void
 393 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 394 {
 395         LDAPConn        *tmplc, *prevlc;
 396
 397         Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
 398
 399         if ( force || --lc->lconn_refcnt <= 0 ) {
 400                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 401                         ldap_mark_select_clear( ld, lc->lconn_sb );
 402                         if ( unbind ) {
 403                                 ldap_send_unbind( ld, lc->lconn_sb, NULL, NULL );
 404                         }
 405                 }
 406
 407                 if( lc->lconn_ber != NULL ) {
 408                         ber_free( lc->lconn_ber, 1 );
 409                 }
 410
 411                 ldap_int_sasl_close( ld, lc );
 412
 413                 prevlc = NULL;
 414                 for ( tmplc = ld->ld_conns; tmplc != NULL;
 415                     tmplc = tmplc->lconn_next ) {
 416                         if ( tmplc == lc ) {
 417                                 if ( prevlc == NULL ) {
 418                                     ld->ld_conns = tmplc->lconn_next;
 419                                 } else {
 420                                     prevlc->lconn_next = tmplc->lconn_next;
 421                                 }
 422                                 break;
 423                         }
 424                         prevlc = tmplc;
 425                 }
 426                 ldap_free_urllist( lc->lconn_server );
 427 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
 428                 if ( lc->lconn_krbinstance != NULL ) {
 429                         LDAP_FREE( lc->lconn_krbinstance );
 430                 }
 431 #endif
 432                 if ( lc->lconn_sb != ld->ld_sb ) {
 433                         ber_sockbuf_free( lc->lconn_sb );
 434                 }
 435                 if( lc->lconn_rebind_queue != NULL) {
 436                         int i;
 437                         for( i = 0; lc->lconn_rebind_queue[i] != NULL; i++) {
 438                                 LDAP_VFREE(lc->lconn_rebind_queue[i]);
 439                         }
 440                         LDAP_FREE( lc->lconn_rebind_queue);
 441                 }
 442                 LDAP_FREE( lc );
 443                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
 444                     0, 0, 0 );
 445         } else {
 446                 lc->lconn_lastused = time( NULL );
 447                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 448                     lc->lconn_refcnt, 0, 0 );
 449         }
 450 }
 451
 452
 453 #ifdef LDAP_DEBUG
 454 void
 455 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 456 {
 457         LDAPConn        *lc;
 458         char            timebuf[32];
 459
 460         fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
 461         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 462                 if ( lc->lconn_server != NULL ) {
 463                         fprintf( stderr, "* host: %s  port: %d%s\n",
 464                             ( lc->lconn_server->lud_host == NULL ) ? "(null)"
 465                             : lc->lconn_server->lud_host,
 466                             lc->lconn_server->lud_port, ( lc->lconn_sb ==
 467                             ld->ld_sb ) ? "  (default)" : "" );
 468                 }
 469                 fprintf( stderr, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 470                     ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
 471                     "NeedSocket" : ( lc->lconn_status ==
 472                     LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
 473                 fprintf( stderr, "  last used: %s",
 474                     ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
 475                 if( lc->lconn_rebind_inprogress ) {
 476                         fprintf( stderr, "  rebind in progress\n");
 477                         if( lc->lconn_rebind_queue != NULL) {
 478                                 int i = 0;
 479                                 for( ;lc->lconn_rebind_queue[i] != NULL; i++) {
 480                                         int j = 0;
 481                                         for( ;lc->lconn_rebind_queue[i][j] != 0; j++) {
 482                                                 fprintf( stderr, "    queue %d entry %d - %s\n",
 483                                                         i, j, lc->lconn_rebind_queue[i][j]);
 484                                         }
 485                                 }
 486                         } else {
 487                                 fprintf( stderr, "    queue is empty\n");
 488                         }
 489                 }
 490                 fprintf(stderr, "\n");
 491                 if ( !all ) {
 492                         break;
 493                 }
 494         }
 495 }
 496
 497
 498 void
 499 ldap_dump_requests_and_responses( LDAP *ld )
 500 {
 501         LDAPRequest     *lr;
 502         LDAPMessage     *lm, *l;
 503
 504         fprintf( stderr, "** Outstanding Requests:\n" );
 505         if (( lr = ld->ld_requests ) == NULL ) {
 506                 fprintf( stderr, "   Empty\n" );
 507         }
 508         for ( ; lr != NULL; lr = lr->lr_next ) {
 509             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 510                 lr->lr_msgid, lr->lr_origid,
 511                 ( lr->lr_status == LDAP_REQST_INPROGRESS ) ? "InProgress" :
 512                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 513                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 514                 ( lr->lr_status == LDAP_REQST_WRITING) ? "Writing" :
 515                 ( lr->lr_status == LDAP_REQST_COMPLETED ? "Request Completed" : "Invalid Status"));
 516             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 517                     lr->lr_outrefcnt, lr->lr_parentcnt );
 518         }
 519
 520         fprintf( stderr, "** Response Queue:\n" );
 521         if (( lm = ld->ld_responses ) == NULL ) {
 522                 fprintf( stderr, "   Empty\n" );
 523         }
 524         for ( ; lm != NULL; lm = lm->lm_next ) {
 525                 fprintf( stderr, " * msgid %d,  type %lu\n",
 526                     lm->lm_msgid, (unsigned long) lm->lm_msgtype );
 527                 if (( l = lm->lm_chain ) != NULL ) {
 528                         fprintf( stderr, "   chained responses:\n" );
 529                         for ( ; l != NULL; l = l->lm_chain ) {
 530                                 fprintf( stderr,
 531                                     "  * msgid %d,  type %lu\n",
 532                                     l->lm_msgid,
 533                                     (unsigned long) l->lm_msgtype );
 534                         }
 535                 }
 536         }
 537 }
 538 #endif /* LDAP_DEBUG */
 539
 540 void
 541 ldap_free_request_int( LDAP *ld, LDAPRequest *lr )
 542 {
 543         if ( lr->lr_prev == NULL ) {
 544                 ld->ld_requests = lr->lr_next;
 545         } else {
 546                 lr->lr_prev->lr_next = lr->lr_next;
 547         }
 548
 549         if ( lr->lr_next != NULL ) {
 550                 lr->lr_next->lr_prev = lr->lr_prev;
 551         }
 552
 553         if ( lr->lr_ber != NULL ) {
 554                 ber_free( lr->lr_ber, 1 );
 555         }
 556
 557         if ( lr->lr_res_error != NULL ) {
 558                 LDAP_FREE( lr->lr_res_error );
 559         }
 560
 561         if ( lr->lr_res_matched != NULL ) {
 562                 LDAP_FREE( lr->lr_res_matched );
 563         }
 564
 565         LDAP_FREE( lr );
 566 }
 567
 568 void
 569 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 570 {
 571         LDAPRequest     **ttmplr;
 572
 573         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 574                 lr->lr_origid, lr->lr_msgid, 0 );
 575
 576         if ( lr->lr_parent != NULL ) {
 577                 --lr->lr_parent->lr_outrefcnt;
 578                 for ( ttmplr = &lr->lr_parent->lr_child; *ttmplr && *ttmplr != lr; ttmplr = &(*ttmplr)->lr_refnext );
 579                 if ( *ttmplr == lr )
 580                         *ttmplr = lr->lr_refnext;
 581         } else {
 582                 /* free all referrals (child requests) */
 583                 while ( lr->lr_child )
 584                         ldap_free_request( ld, lr->lr_child );
 585         }
 586         ldap_free_request_int( ld, lr );
 587 }
 588
 589
 590 /*
 591  * Chase v3 referrals
 592  *
 593  * Parameters:
 594  *  (IN) ld = LDAP connection handle
 595  *  (IN) lr = LDAP Request structure
 596  *  (IN) refs = array of pointers to referral strings that we will chase
 597  *              The array will be free'd by this function when no longer needed
 598  *  (IN) sref != 0 if following search reference
 599  *  (OUT) errstrp = Place to return a string of referrals which could not be followed
 600  *  (OUT) hadrefp = 1 if sucessfully followed referral
 601  *
 602  * Return value - number of referrals followed
 603  */
 604 int
 605 ldap_chase_v3referrals( LDAP *ld, LDAPRequest *lr, char **refs, int sref, char **errstrp, int *hadrefp )
 606 {
 607         char            *unfollowed;
 608         int                      unfollowedcnt = 0;
 609         LDAPRequest     *origreq;
 610         LDAPURLDesc     *srv = NULL;
 611         BerElement      *ber;
 612         char            **refarray = NULL;
 613         LDAPConn        *lc;
 614         int                      rc, count, i, j;
 615         LDAPreqinfo  rinfo;
 616
 617         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 618         *hadrefp = 0;
 619
 620         Debug( LDAP_DEBUG_TRACE, "ldap_chase_v3referrals\n", 0, 0, 0 );
 621
 622         unfollowed = NULL;
 623         rc = count = 0;
 624
 625         /* If no referrals in array, return */
 626         if ( (refs == NULL) || ( (refs)[0] == NULL) ) {
 627                 rc = 0;
 628                 goto done;
 629         }
 630
 631         /* Check for hop limit exceeded */
 632         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 633                 Debug( LDAP_DEBUG_ANY,
 634                     "more than %d referral hops (dropping)\n", ld->ld_refhoplimit, 0, 0 );
 635                 ld->ld_errno = LDAP_REFERRAL_LIMIT_EXCEEDED;
 636             rc = -1;
 637                 goto done;
 638         }
 639
 640         /* find original request */
 641         for ( origreq = lr;
 642                 origreq->lr_parent != NULL;
 643                 origreq = origreq->lr_parent )
 644         {
 645                 /* empty */ ;
 646         }
 647
 648         refarray = refs;
 649         refs = NULL;
 650         /* parse out & follow referrals */
 651         for( i=0; refarray[i] != NULL; i++) {
 652                 /* Parse the referral URL */
 653                 if (( rc = ldap_url_parse_ext( refarray[i], &srv)) != LDAP_SUCCESS) {
 654                         ld->ld_errno = rc;
 655                         rc = -1;
 656                         goto done;
 657                 }
 658
 659                 if( srv->lud_crit_exts ) {
 660                         /* we do not support any extensions */
 661                         ld->ld_errno = LDAP_NOT_SUPPORTED;
 662                         rc = -1;
 663                         goto done;
 664                 }
 665
 666                 /* treat ldap://hostpart and ldap://hostpart/ the same */
 667                 if ( srv->lud_dn && srv->lud_dn[0] == '\0' ) {
 668                         LDAP_FREE( srv->lud_dn );
 669                         srv->lud_dn = NULL;
 670                 }
 671
 672                 /* check connection for re-bind in progress */
 673                 if (( lc = find_connection( ld, srv, 1 )) != NULL ) {
 674                         if( lc->lconn_rebind_inprogress) {
 675                                 /* We are already chasing a referral or search reference and a
 676                                  * bind on that connection is in progress.  We must queue
 677                                  * referrals on that connection, so we don't get a request
 678                                  * going out before the bind operation completes. This happens
 679                                  * if two search references come in one behind the other
 680                                  * for the same server with different contexts.
 681                                  */
 682                                 Debug( LDAP_DEBUG_TRACE,
 683                                         "ldap_chase_v3referrals: queue referral \"%s\"\n",
 684                                         refarray[i], 0, 0);
 685                                 if( lc->lconn_rebind_queue == NULL ) {
 686                                         /* Create a referral list */
 687                                         lc->lconn_rebind_queue =
 688                                                 (char ***) LDAP_MALLOC( sizeof(void *) * 2);
 689
 690                                         if( lc->lconn_rebind_queue == NULL) {
 691                                                 ld->ld_errno = LDAP_NO_MEMORY;
 692                                                 rc = -1;
 693                                                 goto done;
 694                                         }
 695
 696                                         lc->lconn_rebind_queue[0] = refarray;
 697                                         lc->lconn_rebind_queue[1] = NULL;
 698                                         refarray = NULL;
 699
 700                                 } else {
 701                                         /* Count how many referral arrays we already have */
 702                                         for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 703                                                 /* empty */;
 704                                         }
 705
 706                                         /* Add the new referral to the list */
 707                                         lc->lconn_rebind_queue = (char ***) LDAP_REALLOC(
 708                                                 lc->lconn_rebind_queue, sizeof(void *) * (j + 2));
 709
 710                                         if( lc->lconn_rebind_queue == NULL ) {
 711                                                 ld->ld_errno = LDAP_NO_MEMORY;
 712                                                 rc = -1;
 713                                                 goto done;
 714                                         }
 715                                         lc->lconn_rebind_queue[j] = refarray;
 716                                         lc->lconn_rebind_queue[j+1] = NULL;
 717                                         refarray = NULL;
 718                                 }
 719
 720                                 /* We have queued the referral/reference, now just return */
 721                                 rc = 0;
 722                                 *hadrefp = 1;
 723                                 count = 1; /* Pretend we already followed referral */
 724                                 goto done;
 725                         }
 726                 }
 727                 /* Re-encode the request with the new starting point of the search.
 728                  * Note: In the future we also need to replace the filter if one
 729                  * was provided with the search reference
 730                  */
 731
 732                 /* For references we don't want old dn if new dn empty */
 733                 if ( sref && srv->lud_dn == NULL ) {
 734                         srv->lud_dn = LDAP_STRDUP( "" );
 735                 }
 736
 737                 ber = re_encode_request( ld, origreq->lr_ber, ++ld->ld_msgid,
 738                         sref, srv, &rinfo.ri_request );
 739
 740                 if( ber == NULL ) {
 741                         ld->ld_errno = LDAP_ENCODING_ERROR;
 742                         rc = -1;
 743                         goto done;
 744                 }
 745
 746                 Debug( LDAP_DEBUG_TRACE,
 747                         "ldap_chase_v3referral: msgid %d, url \"%s\"\n",
 748                         lr->lr_msgid, refarray[i], 0);
 749
 750                 /* Send the new request to the server - may require a bind */
 751                 rinfo.ri_msgid = origreq->lr_origid;
 752                 rinfo.ri_url = refarray[i];
 753                 if ( (rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 754                         origreq, srv, NULL, &rinfo )) < 0 ) {
 755                         /* Failure, try next referral in the list */
 756                         Debug( LDAP_DEBUG_ANY, "Unable to chase referral \"%s\" (%s)\n",
 757                                 refarray[i], ldap_err2string( ld->ld_errno ), 0);
 758                         unfollowedcnt += ldap_append_referral( ld, &unfollowed, refarray[i]);
 759                         ldap_free_urllist(srv);
 760                         srv = NULL;
 761                 } else {
 762                         /* Success, no need to try this referral list further */
 763                         rc = 0;
 764                         ++count;
 765                         *hadrefp = 1;
 766
 767                         /* check if there is a queue of referrals that came in during bind */
 768                         if( lc == NULL) {
 769                                 if (( lc = find_connection( ld, srv, 1 )) == NULL ) {
 770                                         ld->ld_errno = LDAP_OPERATIONS_ERROR;
 771                                         rc = -1;
 772                                         goto done;
 773                                 }
 774                         }
 775
 776                         if( lc->lconn_rebind_queue != NULL) {
 777                                 /* Release resources of previous list */
 778                                 LDAP_VFREE(refarray);
 779                                 refarray = NULL;
 780                                 ldap_free_urllist(srv);
 781                                 srv = NULL;
 782
 783                                 /* Pull entries off end of queue so list always null terminated */
 784                                 for( j = 0; lc->lconn_rebind_queue[j] != NULL; j++) {
 785                                         ;
 786                                 }
 787                                 refarray = lc->lconn_rebind_queue[j-1];
 788                                 lc->lconn_rebind_queue[j-1] = NULL;
 789                                 /* we pulled off last entry from queue, free queue */
 790                                 if ( j == 1 ) {
 791                                         LDAP_FREE( lc->lconn_rebind_queue);
 792                                         lc->lconn_rebind_queue = NULL;
 793                                 }
 794                                 /* restart the loop the with new referral list */
 795                                 i = -1;
 796                                 continue;
 797                         }
 798                         break; /* referral followed, break out of for loop */
 799                 }
 800         } /* end for loop */
 801 done:
 802         LDAP_VFREE(refarray);
 803         ldap_free_urllist(srv);
 804         LDAP_FREE( *errstrp );
 805
 806         if( rc == 0) {
 807                 *errstrp = NULL;
 808                 LDAP_FREE( unfollowed );
 809                 return count;
 810         } else {
 811                 ld->ld_errno = LDAP_REFERRAL;
 812                 *errstrp = unfollowed;
 813                 return rc;
 814         }
 815 }
 816
 817 /*
 818  * XXX merging of errors in this routine needs to be improved
 819  */
 820 int
 821 ldap_chase_referrals( LDAP *ld,
 822         LDAPRequest *lr,
 823         char **errstrp,
 824         int sref,
 825         int *hadrefp )
 826 {
 827         int             rc, count, len;
 828         char            *p, *ref, *unfollowed;
 829         LDAPRequest     *origreq;
 830         LDAPURLDesc     *srv;
 831         BerElement      *ber;
 832         LDAPreqinfo  rinfo;
 833
 834         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 835
 836         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 837         *hadrefp = 0;
 838
 839         if ( *errstrp == NULL ) {
 840                 return( 0 );
 841         }
 842
 843         len = strlen( *errstrp );
 844         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 845                 if ( strncasecmp( p, LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 846                         *p = '\0';
 847                         p += LDAP_REF_STR_LEN;
 848                         break;
 849                 }
 850         }
 851
 852         if ( len < LDAP_REF_STR_LEN ) {
 853                 return( 0 );
 854         }
 855
 856         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 857                 Debug( LDAP_DEBUG_ANY,
 858                     "more than %d referral hops (dropping)\n",
 859                     ld->ld_refhoplimit, 0, 0 );
 860                     /* XXX report as error in ld->ld_errno? */
 861                     return( 0 );
 862         }
 863
 864         /* find original request */
 865         for ( origreq = lr; origreq->lr_parent != NULL;
 866              origreq = origreq->lr_parent ) {
 867                 /* empty */;
 868         }
 869
 870         unfollowed = NULL;
 871         rc = count = 0;
 872
 873         /* parse out & follow referrals */
 874         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 875                 if (( p = strchr( ref, '\n' )) != NULL ) {
 876                         *p++ = '\0';
 877                 } else {
 878                         p = NULL;
 879                 }
 880
 881                 rc = ldap_url_parse_ext( ref, &srv );
 882
 883                 if ( rc != LDAP_URL_SUCCESS ) {
 884                         Debug( LDAP_DEBUG_TRACE,
 885                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 886                         rc = ldap_append_referral( ld, &unfollowed, ref );
 887                         *hadrefp = 1;
 888                         continue;
 889                 }
 890
 891                 if( srv->lud_dn != NULL && srv->lud_dn == '\0' ) {
 892                         LDAP_FREE( srv->lud_dn );
 893                         srv->lud_dn = NULL;
 894                 }
 895
 896                 Debug( LDAP_DEBUG_TRACE,
 897                     "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 898
 899                 *hadrefp = 1;
 900
 901                 ber = re_encode_request( ld, origreq->lr_ber,
 902                     ++ld->ld_msgid, sref, srv, &rinfo.ri_request );
 903
 904                 if( ber == NULL ) {
 905                         return -1 ;
 906                 }
 907
 908                 /* copy the complete referral for rebind process */
 909                 rinfo.ri_url = LDAP_STRDUP( ref );
 910
 911                 rinfo.ri_msgid = origreq->lr_origid;
 912
 913                 rc = ldap_send_server_request( ld, ber, ld->ld_msgid,
 914                     lr, srv, NULL, &rinfo );
 915
 916                 LDAP_FREE( rinfo.ri_url );
 917
 918                 if( rc >= 0 ) {
 919                         ++count;
 920                 } else {
 921                         Debug( LDAP_DEBUG_ANY,
 922                             "Unable to chase referral (%s)\n",
 923                             ldap_err2string( ld->ld_errno ), 0, 0 );
 924                         rc = ldap_append_referral( ld, &unfollowed, ref );
 925                 }
 926
 927                 ldap_free_urllist(srv);
 928         }
 929
 930         LDAP_FREE( *errstrp );
 931         *errstrp = unfollowed;
 932
 933         return(( rc == 0 ) ? count : rc );
 934 }
 935
 936
 937 int
 938 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 939 {
 940         int     first;
 941
 942         if ( *referralsp == NULL ) {
 943                 first = 1;
 944                 *referralsp = (char *)LDAP_MALLOC( strlen( s ) + LDAP_REF_STR_LEN
 945                     + 1 );
 946         } else {
 947                 first = 0;
 948                 *referralsp = (char *)LDAP_REALLOC( *referralsp,
 949                     strlen( *referralsp ) + strlen( s ) + 2 );
 950         }
 951
 952         if ( *referralsp == NULL ) {
 953                 ld->ld_errno = LDAP_NO_MEMORY;
 954                 return( -1 );
 955         }
 956
 957         if ( first ) {
 958                 strcpy( *referralsp, LDAP_REF_STR );
 959         } else {
 960                 strcat( *referralsp, "\n" );
 961         }
 962         strcat( *referralsp, s );
 963
 964         return( 0 );
 965 }
 966
 967
 968
 969 static BerElement *
 970 re_encode_request( LDAP *ld,
 971         BerElement *origber,
 972         ber_int_t msgid,
 973         int sref,
 974         LDAPURLDesc *srv,
 975         int *type )
 976 {
 977         /*
 978          * XXX this routine knows way too much about how the lber library works!
 979          */
 980         ber_int_t       along;
 981         ber_tag_t       tag;
 982         ber_int_t       ver;
 983         ber_int_t       scope;
 984         int             rc;
 985         BerElement      tmpber, *ber;
 986         char            *orig_dn;
 987         char            *dn;
 988
 989         Debug( LDAP_DEBUG_TRACE,
 990             "re_encode_request: new msgid %ld, new dn <%s>\n",
 991             (long) msgid,
 992                 ( srv == NULL || srv->lud_dn == NULL) ? "NONE" : srv->lud_dn, 0 );
 993
 994         tmpber = *origber;
 995
 996         /*
 997          * all LDAP requests are sequences that start with a message id.
 998          * For all except delete, this is followed by a sequence that is
 999          * tagged with the operation code.  For delete, the provided DN
1000          * is not wrapped by a sequence.
1001          */
1002         rc = ber_scanf( &tmpber, "{it", /*}*/ &along, &tag );
1003
1004         if ( rc == LBER_ERROR ) {
1005                 ld->ld_errno = LDAP_DECODING_ERROR;
1006                 return( NULL );
1007         }
1008
1009         assert( tag != 0);
1010         if ( tag == LDAP_REQ_BIND ) {
1011                 /* bind requests have a version number before the DN & other stuff */
1012                 rc = ber_scanf( &tmpber, "{ia" /*}*/, &ver, &orig_dn );
1013
1014         } else if ( tag == LDAP_REQ_DELETE ) {
1015                 /* delete requests don't have a DN wrapping sequence */
1016                 rc = ber_scanf( &tmpber, "a", &orig_dn );
1017
1018         } else if ( tag == LDAP_REQ_SEARCH ) {
1019                 /* search requests need to be re-scope-ed */
1020                 rc = ber_scanf( &tmpber, "{ae" /*"}"*/, &orig_dn, &scope );
1021
1022                 if( srv->lud_scope != LDAP_SCOPE_DEFAULT ) {
1023                         /* use the scope provided in reference */
1024                         scope = srv->lud_scope;
1025
1026                 } else if ( sref && scope != LDAP_SCOPE_SUBTREE ) {
1027                         /* use scope implied by previous operation */
1028                         /*   base -> base */
1029                         /*   one -> base */
1030                         /*   subtree -> subtree */
1031                         scope = LDAP_SCOPE_BASE;
1032                 }
1033
1034         } else {
1035                 rc = ber_scanf( &tmpber, "{a" /*}*/, &orig_dn );
1036         }
1037
1038         if( rc == LBER_ERROR ) {
1039                 ld->ld_errno = LDAP_DECODING_ERROR;
1040                 return NULL;
1041         }
1042
1043         if (( ber = ldap_alloc_ber_with_options( ld )) == NULL ) {
1044                 return NULL;
1045         }
1046
1047         if ( srv->lud_dn == NULL ) {
1048                 dn = orig_dn;
1049         } else {
1050                 dn = srv->lud_dn;
1051         }
1052
1053         if ( tag == LDAP_REQ_BIND ) {
1054                 rc = ber_printf( ber, "{it{is" /*}}*/, msgid, tag, ver, dn );
1055         } else if ( tag == LDAP_REQ_DELETE ) {
1056                 rc = ber_printf( ber, "{itsN}", msgid, tag, dn );
1057         } else if ( tag == LDAP_REQ_SEARCH ) {
1058                 rc = ber_printf( ber, "{it{se" /*}}*/, msgid, tag, dn, scope );
1059         } else {
1060                 rc = ber_printf( ber, "{it{s" /*}}*/, msgid, tag, dn );
1061         }
1062
1063         LDAP_FREE( orig_dn );
1064
1065         if ( rc == -1 ) {
1066                 ld->ld_errno = LDAP_ENCODING_ERROR;
1067                 ber_free( ber, 1 );
1068                 return NULL;
1069         }
1070
1071         if ( tag != LDAP_REQ_DELETE && (
1072                 ber_write(ber, tmpber.ber_ptr, ( tmpber.ber_end - tmpber.ber_ptr ), 0)
1073                 != ( tmpber.ber_end - tmpber.ber_ptr ) ||
1074             ber_printf( ber, /*{{*/ "N}N}" ) == -1 ) )
1075         {
1076                 ld->ld_errno = LDAP_ENCODING_ERROR;
1077                 ber_free( ber, 1 );
1078                 return NULL;
1079         }
1080
1081 #ifdef LDAP_DEBUG
1082         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
1083                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
1084                     0, 0, 0 );
1085                 ber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
1086         }
1087 #endif /* LDAP_DEBUG */
1088
1089         *type = tag;    /* return request type */
1090         return ber;
1091 }
1092
1093
1094 LDAPRequest *
1095 ldap_find_request_by_msgid( LDAP *ld, ber_int_t msgid )
1096 {
1097         LDAPRequest     *lr;
1098
1099         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
1100                 if( lr->lr_status == LDAP_REQST_COMPLETED ) {
1101                         continue;       /* Skip completed requests */
1102                 }
1103                 if ( msgid == lr->lr_msgid ) {
1104                         break;
1105                 }
1106         }
1107
1108         return( lr );
1109 }
1110
1111