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

   1 /*
   2  * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
   3  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   4  */
   5 /*  Portions
   6  *  Copyright (c) 1995 Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  request.c - sending of ldap requests; handling of referrals
  10  */
  11
  12 #include "portable.h"
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16
  17 #include <ac/errno.h>
  18 #include <ac/socket.h>
  19 #include <ac/string.h>
  20 #include <ac/time.h>
  21 #include <ac/unistd.h>
  22
  23 #include "ldap-int.h"
  24
  25 #if defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) || defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
  26 static LDAPConn *find_connection LDAP_P(( LDAP *ld, LDAPServer *srv, int any ));
  27 static void use_connection LDAP_P(( LDAP *ld, LDAPConn *lc ));
  28 static void free_servers LDAP_P(( LDAPServer *srvlist ));
  29 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS || LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  30
  31
  32 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
  33 static LDAPServer *dn2servers LDAP_P(( LDAP *ld, char *dn ));
  34 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  35
  36 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS
  37 static BerElement *re_encode_request LDAP_P(( LDAP *ld, BerElement *origber,
  38     int msgid, char **dnp ));
  39 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
  40
  41
  42 BerElement *
  43 ldap_alloc_ber_with_options( LDAP *ld )
  44 {
  45         BerElement      *ber;
  46
  47         if (( ber = ber_alloc_t( ld->ld_lberoptions )) == NULLBER ) {
  48                 ld->ld_errno = LDAP_NO_MEMORY;
  49 #ifdef STR_TRANSLATION
  50         } else {
  51                 ldap_set_ber_options( ld, ber );
  52 #endif /* STR_TRANSLATION */
  53         }
  54
  55         return( ber );
  56 }
  57
  58
  59 void
  60 ldap_set_ber_options( LDAP *ld, BerElement *ber )
  61 {
  62         ber->ber_options = ld->ld_lberoptions;
  63 #ifdef STR_TRANSLATION
  64         if (( ld->ld_lberoptions & LBER_TRANSLATE_STRINGS ) != 0 ) {
  65                 ber_set_string_translators( ber,
  66                     ld->ld_lber_encode_translate_proc,
  67                     ld->ld_lber_decode_translate_proc );
  68         }
  69 #endif /* STR_TRANSLATION */
  70 }
  71
  72
  73 int
  74 ldap_send_initial_request( LDAP *ld, unsigned long msgtype, char *dn,
  75         BerElement *ber )
  76 {
  77 #if defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) || defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
  78         LDAPServer      *servers, *srv;
  79 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS || LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
  80
  81         Debug( LDAP_DEBUG_TRACE, "ldap_send_initial_request\n", 0, 0, 0 );
  82
  83         if ( ld->ld_sb.sb_sd == -1 ) {
  84                 /* not connected yet */
  85
  86 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS
  87                 if (( srv = (LDAPServer *)calloc( 1, sizeof( LDAPServer ))) ==
  88                     NULL || ( ld->ld_defhost != NULL && ( srv->lsrv_host =
  89                     strdup( ld->ld_defhost )) == NULL ))
  90                 {
  91                         if (srv != NULL) free( srv );
  92                         ld->ld_errno = LDAP_NO_MEMORY;
  93                         return( -1 );
  94                 }
  95
  96                 srv->lsrv_port = ld->ld_defport;
  97
  98                 if (( ld->ld_defconn = ldap_new_connection( ld, &srv, 1,1,0 ))
  99                         == NULL )
 100                 {
 101                         if ( ld->ld_defhost != NULL ) free( srv->lsrv_host );
 102                         free( (char *)srv );
 103                         ld->ld_errno = LDAP_SERVER_DOWN;
 104                         return( -1 );
 105                 }
 106                 ++ld->ld_defconn->lconn_refcnt; /* so it never gets closed/freed */
 107
 108 #else /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
 109                 if ( open_ldap_connection( ld, &ld->ld_sb, ld->ld_defhost,
 110                     ld->ld_defport, &ld->ld_host, 0 ) < 0 )
 111                 {
 112                         ldap_ld_free( ld, 0 );
 113                         ld->ld_errno = LDAP_SERVER_DOWN;
 114                         return( -1 );
 115                 }
 116 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
 117
 118                 Debug( LDAP_DEBUG_TRACE,
 119                         "ldap_delayed_open successful, ld_host is %s\n",
 120                         ( ld->ld_host == NULL ) ? "(null)" : ld->ld_host, 0, 0 );
 121         }
 122
 123
 124 #if !defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) && !defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
 125
 126         if ( ber_flush( &ld->ld_sb, ber, 1 ) != 0 ) {
 127                 ld->ld_errno = LDAP_SERVER_DOWN;
 128                 return( -1 );
 129         }
 130
 131         ld->ld_errno = LDAP_SUCCESS;
 132         return( ld->ld_msgid );
 133 #else /* !LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS && !LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 134
 135 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 136         if (( LDAP_BOOL_GET(&ld->ld_options, LDAP_BOOL_DNS ) == LDAP_OPT_ON )
 137                 && ldap_is_dns_dn( dn ) )
 138         {
 139                 if (( servers = dn2servers( ld, dn )) == NULL ) {
 140                         ber_free( ber, 1 );
 141                         return( -1 );
 142                 }
 143
 144 #ifdef LDAP_DEBUG
 145                 if ( ldap_debug & LDAP_DEBUG_TRACE ) {
 146                         LDAPServer      *srv;
 147
 148                         for ( srv = servers; srv != NULL;
 149                             srv = srv->lsrv_next ) {
 150                                 fprintf( stderr,
 151                                     "LDAP server %s:  dn %s, port %d\n",
 152                                     srv->lsrv_host, ( srv->lsrv_dn == NULL ) ?
 153                                     "(default)" : srv->lsrv_dn,
 154                                     srv->lsrv_port );
 155                         }
 156                 }
 157 #endif /* LDAP_DEBUG */
 158         } else {
 159 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 160                 /*
 161                  * use of DNS is turned off or this is an X.500 DN...
 162                  * use our default connection
 163                  */
 164                 servers = NULL;
 165 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 166         }
 167 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 168
 169         return( ldap_send_server_request( ld, ber, ld->ld_msgid, NULL, servers,
 170             NULL, 0 ));
 171 #endif /* !LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS && !LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 172 }
 173
 174
 175
 176 #if defined( LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS ) || defined( LDAP_API_FEATURE_X_OPENLDAP_V2_DNS )
 177 int
 178 ldap_send_server_request( LDAP *ld, BerElement *ber, int msgid, LDAPRequest
 179         *parentreq, LDAPServer *srvlist, LDAPConn *lc, int bind )
 180 {
 181         LDAPRequest     *lr;
 182         int incparent;
 183
 184         Debug( LDAP_DEBUG_TRACE, "ldap_send_server_request\n", 0, 0, 0 );
 185
 186         incparent = 0;
 187         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 188
 189         if ( lc == NULL ) {
 190                 if ( srvlist == NULL ) {
 191                         lc = ld->ld_defconn;
 192                 } else {
 193                         if (( lc = find_connection( ld, srvlist, 1 )) ==
 194                             NULL ) {
 195                                 if ( bind && (parentreq != NULL) ) {
 196                                         /* Remember the bind in the parent */
 197                                         incparent = 1;
 198                                         ++parentreq->lr_outrefcnt;
 199                                 }
 200                                 lc = ldap_new_connection( ld, &srvlist, 0, 1, bind );
 201                         }
 202                         free_servers( srvlist );
 203                 }
 204         }
 205
 206         if ( lc == NULL || lc->lconn_status != LDAP_CONNST_CONNECTED ) {
 207                 ber_free( ber, 1 );
 208                 if ( ld->ld_errno == LDAP_SUCCESS ) {
 209                         ld->ld_errno = LDAP_SERVER_DOWN;
 210                 }
 211                 if ( incparent ) {
 212                         /* Forget about the bind */
 213                         --parentreq->lr_outrefcnt;
 214                 }
 215                 return( -1 );
 216         }
 217
 218         use_connection( ld, lc );
 219         if (( lr = (LDAPRequest *)calloc( 1, sizeof( LDAPRequest ))) ==
 220             NULL ) {
 221                 ld->ld_errno = LDAP_NO_MEMORY;
 222                 ldap_free_connection( ld, lc, 0, 0 );
 223                 ber_free( ber, 1 );
 224                 if ( incparent ) {
 225                         /* Forget about the bind */
 226                         --parentreq->lr_outrefcnt;
 227                 }
 228                 return( -1 );
 229         }
 230         lr->lr_msgid = msgid;
 231         lr->lr_status = LDAP_REQST_INPROGRESS;
 232         lr->lr_res_errno = LDAP_SUCCESS;        /* optimistic */
 233         lr->lr_ber = ber;
 234         lr->lr_conn = lc;
 235         if ( parentreq != NULL ) {      /* sub-request */
 236                 if ( !incparent ) {
 237                         /* Increment if we didn't do it before the bind */
 238                         ++parentreq->lr_outrefcnt;
 239                 }
 240                 lr->lr_origid = parentreq->lr_origid;
 241                 lr->lr_parentcnt = parentreq->lr_parentcnt + 1;
 242                 lr->lr_parent = parentreq;
 243                 lr->lr_refnext = parentreq->lr_refnext;
 244                 parentreq->lr_refnext = lr;
 245         } else {                        /* original request */
 246                 lr->lr_origid = lr->lr_msgid;
 247         }
 248
 249         if (( lr->lr_next = ld->ld_requests ) != NULL ) {
 250                 lr->lr_next->lr_prev = lr;
 251         }
 252         ld->ld_requests = lr;
 253         lr->lr_prev = NULL;
 254
 255         if ( ber_flush( lc->lconn_sb, ber, 0 ) != 0 ) {
 256 #ifdef notyet
 257                 if ( errno == EWOULDBLOCK ) {
 258                         /* need to continue write later */
 259                         lr->lr_status = LDAP_REQST_WRITING;
 260                         ldap_mark_select_write( ld, lc->lconn_sb );
 261                 } else {
 262 #else /* notyet */
 263                         ld->ld_errno = LDAP_SERVER_DOWN;
 264                         ldap_free_request( ld, lr );
 265                         ldap_free_connection( ld, lc, 0, 0 );
 266                         return( -1 );
 267 #endif /* notyet */
 268 #ifdef notyet
 269                 }
 270 #endif /* notyet */
 271         } else {
 272                 if ( parentreq == NULL ) {
 273                         ber->ber_end = ber->ber_ptr;
 274                         ber->ber_ptr = ber->ber_buf;
 275                 }
 276
 277                 /* sent -- waiting for a response */
 278                 ldap_mark_select_read( ld, lc->lconn_sb );
 279         }
 280
 281         ld->ld_errno = LDAP_SUCCESS;
 282         return( msgid );
 283 }
 284
 285
 286 LDAPConn *
 287 ldap_new_connection( LDAP *ld, LDAPServer **srvlistp, int use_ldsb,
 288         int connect, int bind )
 289 {
 290         LDAPConn        *lc;
 291         LDAPServer      *prevsrv, *srv;
 292         Sockbuf         *sb;
 293
 294         /*
 295          * make a new LDAP server connection
 296          * XXX open connection synchronously for now
 297          */
 298         if (( lc = (LDAPConn *)calloc( 1, sizeof( LDAPConn ))) == NULL ||
 299             ( !use_ldsb && ( sb = (Sockbuf *)calloc( 1, sizeof( Sockbuf )))
 300             == NULL )) {
 301                 if ( lc != NULL ) {
 302                         free( (char *)lc );
 303                 }
 304                 ld->ld_errno = LDAP_NO_MEMORY;
 305                 return( NULL );
 306         }
 307
 308         lc->lconn_sb = ( use_ldsb ) ? &ld->ld_sb : sb;
 309
 310         if ( connect ) {
 311                 prevsrv = NULL;
 312
 313                 for ( srv = *srvlistp; srv != NULL; srv = srv->lsrv_next ) {
 314                         if ( open_ldap_connection( ld, lc->lconn_sb,
 315                             srv->lsrv_host, srv->lsrv_port,
 316                             &lc->lconn_krbinstance, 0 ) != -1 ) {
 317                                 break;
 318                         }
 319                         prevsrv = srv;
 320                 }
 321
 322                 if ( srv == NULL ) {
 323                     if ( !use_ldsb ) {
 324                         free( (char *)lc->lconn_sb );
 325                     }
 326                     free( (char *)lc );
 327                     ld->ld_errno = LDAP_SERVER_DOWN;
 328                     return( NULL );
 329                 }
 330
 331                 if ( prevsrv == NULL ) {
 332                     *srvlistp = srv->lsrv_next;
 333                 } else {
 334                     prevsrv->lsrv_next = srv->lsrv_next;
 335                 }
 336                 lc->lconn_server = srv;
 337         }
 338
 339         lc->lconn_status = LDAP_CONNST_CONNECTED;
 340         lc->lconn_next = ld->ld_conns;
 341         ld->ld_conns = lc;
 342
 343         /*
 344          * XXX for now, we always do a synchronous bind.  This will have
 345          * to change in the long run...
 346          */
 347         if ( bind ) {
 348                 int             err, freepasswd, authmethod;
 349                 char            *binddn, *passwd;
 350                 LDAPConn        *savedefconn;
 351
 352                 freepasswd = err = 0;
 353
 354                 if ( ld->ld_rebindproc == NULL ) {
 355                         binddn = passwd = "";
 356                         authmethod = LDAP_AUTH_SIMPLE;
 357                 } else {
 358                         if (( err = (*ld->ld_rebindproc)( ld, &binddn, &passwd,
 359                             &authmethod, 0 )) == LDAP_SUCCESS ) {
 360                                 freepasswd = 1;
 361                         } else {
 362                                 ld->ld_errno = err;
 363                                 err = -1;
 364                         }
 365                 }
 366
 367
 368                 if ( err == 0 ) {
 369                         savedefconn = ld->ld_defconn;
 370                         ld->ld_defconn = lc;
 371                         ++lc->lconn_refcnt;     /* avoid premature free */
 372
 373                         if ( ldap_bind_s( ld, binddn, passwd, authmethod ) !=
 374                             LDAP_SUCCESS ) {
 375                                 err = -1;
 376                         }
 377                         --lc->lconn_refcnt;
 378                         ld->ld_defconn = savedefconn;
 379                 }
 380
 381                 if ( freepasswd ) {
 382                         (*ld->ld_rebindproc)( ld, &binddn, &passwd,
 383                                 &authmethod, 1 );
 384                 }
 385
 386                 if ( err != 0 ) {
 387                         ldap_free_connection( ld, lc, 1, 0 );
 388                         lc = NULL;
 389                 }
 390         }
 391
 392         return( lc );
 393 }
 394
 395
 396 static LDAPConn *
 397 find_connection( LDAP *ld, LDAPServer *srv, int any )
 398 /*
 399  * return an existing connection (if any) to the server srv
 400  * if "any" is non-zero, check for any server in the "srv" chain
 401  */
 402 {
 403         LDAPConn        *lc;
 404         LDAPServer      *ls;
 405
 406         for ( lc = ld->ld_conns; lc != NULL; lc = lc->lconn_next ) {
 407                 for ( ls = srv; ls != NULL; ls = ls->lsrv_next ) {
 408                         if ( lc->lconn_server->lsrv_host != NULL &&
 409                             ls->lsrv_host != NULL && strcasecmp(
 410                             ls->lsrv_host, lc->lconn_server->lsrv_host ) == 0
 411                             && ls->lsrv_port == lc->lconn_server->lsrv_port ) {
 412                                 return( lc );
 413                         }
 414                         if ( !any ) {
 415                                 break;
 416                         }
 417                 }
 418         }
 419
 420         return( NULL );
 421 }
 422
 423
 424
 425 static void
 426 use_connection( LDAP *ld, LDAPConn *lc )
 427 {
 428         ++lc->lconn_refcnt;
 429         lc->lconn_lastused = time( 0 );
 430 }
 431
 432
 433 void
 434 ldap_free_connection( LDAP *ld, LDAPConn *lc, int force, int unbind )
 435 {
 436         LDAPConn        *tmplc, *prevlc;
 437
 438         Debug( LDAP_DEBUG_TRACE, "ldap_free_connection\n", 0, 0, 0 );
 439
 440         if ( force || --lc->lconn_refcnt <= 0 ) {
 441                 if ( lc->lconn_status == LDAP_CONNST_CONNECTED ) {
 442                         ldap_mark_select_clear( ld, lc->lconn_sb );
 443                         if ( unbind ) {
 444                                 ldap_send_unbind( ld, lc->lconn_sb );
 445                         }
 446                         ldap_close_connection( lc->lconn_sb );
 447                         if ( lc->lconn_sb->sb_ber.ber_buf != NULL ) {
 448                                 free( lc->lconn_sb->sb_ber.ber_buf );
 449                         }
 450                 }
 451                 prevlc = NULL;
 452                 for ( tmplc = ld->ld_conns; tmplc != NULL;
 453                     tmplc = tmplc->lconn_next ) {
 454                         if ( tmplc == lc ) {
 455                                 if ( prevlc == NULL ) {
 456                                     ld->ld_conns = tmplc->lconn_next;
 457                                 } else {
 458                                     prevlc->lconn_next = tmplc->lconn_next;
 459                                 }
 460                                 break;
 461                         }
 462                         prevlc = tmplc;
 463                 }
 464                 free_servers( lc->lconn_server );
 465                 if ( lc->lconn_krbinstance != NULL ) {
 466                         free( lc->lconn_krbinstance );
 467                 }
 468                 if ( lc->lconn_sb != &ld->ld_sb ) {
 469                         free( (char *)lc->lconn_sb );
 470                 }
 471                 free( lc );
 472                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: actually freed\n",
 473                     0, 0, 0 );
 474         } else {
 475                 lc->lconn_lastused = time( 0 );
 476                 Debug( LDAP_DEBUG_TRACE, "ldap_free_connection: refcnt %d\n",
 477                     lc->lconn_refcnt, 0, 0 );
 478         }
 479 }
 480
 481
 482 #ifdef LDAP_DEBUG
 483 void
 484 ldap_dump_connection( LDAP *ld, LDAPConn *lconns, int all )
 485 {
 486         LDAPConn        *lc;
 487         char            timebuf[32];
 488
 489         fprintf( stderr, "** Connection%s:\n", all ? "s" : "" );
 490         for ( lc = lconns; lc != NULL; lc = lc->lconn_next ) {
 491                 if ( lc->lconn_server != NULL ) {
 492                         fprintf( stderr, "* host: %s  port: %d%s\n",
 493                             ( lc->lconn_server->lsrv_host == NULL ) ? "(null)"
 494                             : lc->lconn_server->lsrv_host,
 495                             lc->lconn_server->lsrv_port, ( lc->lconn_sb ==
 496                             &ld->ld_sb ) ? "  (default)" : "" );
 497                 }
 498                 fprintf( stderr, "  refcnt: %d  status: %s\n", lc->lconn_refcnt,
 499                     ( lc->lconn_status == LDAP_CONNST_NEEDSOCKET ) ?
 500                     "NeedSocket" : ( lc->lconn_status ==
 501                     LDAP_CONNST_CONNECTING ) ? "Connecting" : "Connected" );
 502                 fprintf( stderr, "  last used: %s\n",
 503                     ldap_pvt_ctime( &lc->lconn_lastused, timebuf ));
 504                 if ( !all ) {
 505                         break;
 506                 }
 507         }
 508 }
 509
 510
 511 void
 512 ldap_dump_requests_and_responses( LDAP *ld )
 513 {
 514         LDAPRequest     *lr;
 515         LDAPMessage     *lm, *l;
 516
 517         fprintf( stderr, "** Outstanding Requests:\n" );
 518         if (( lr = ld->ld_requests ) == NULL ) {
 519                 fprintf( stderr, "   Empty\n" );
 520         }
 521         for ( ; lr != NULL; lr = lr->lr_next ) {
 522             fprintf( stderr, " * msgid %d,  origid %d, status %s\n",
 523                 lr->lr_msgid, lr->lr_origid, ( lr->lr_status ==
 524                 LDAP_REQST_INPROGRESS ) ? "InProgress" :
 525                 ( lr->lr_status == LDAP_REQST_CHASINGREFS ) ? "ChasingRefs" :
 526                 ( lr->lr_status == LDAP_REQST_NOTCONNECTED ) ? "NotConnected" :
 527                 "Writing" );
 528             fprintf( stderr, "   outstanding referrals %d, parent count %d\n",
 529                     lr->lr_outrefcnt, lr->lr_parentcnt );
 530         }
 531
 532         fprintf( stderr, "** Response Queue:\n" );
 533         if (( lm = ld->ld_responses ) == NULLMSG ) {
 534                 fprintf( stderr, "   Empty\n" );
 535         }
 536         for ( ; lm != NULLMSG; lm = lm->lm_next ) {
 537                 fprintf( stderr, " * msgid %d,  type %d\n",
 538                     lm->lm_msgid, lm->lm_msgtype );
 539                 if (( l = lm->lm_chain ) != NULL ) {
 540                         fprintf( stderr, "   chained responses:\n" );
 541                         for ( ; l != NULLMSG; l = l->lm_chain ) {
 542                                 fprintf( stderr,
 543                                     "  * msgid %d,  type %d\n",
 544                                     l->lm_msgid, l->lm_msgtype );
 545                         }
 546                 }
 547         }
 548 }
 549 #endif /* LDAP_DEBUG */
 550
 551
 552 void
 553 ldap_free_request( LDAP *ld, LDAPRequest *lr )
 554 {
 555         LDAPRequest     *tmplr, *nextlr;
 556
 557         Debug( LDAP_DEBUG_TRACE, "ldap_free_request (origid %d, msgid %d)\n",
 558                 lr->lr_origid, lr->lr_msgid, 0 );
 559
 560         if ( lr->lr_parent != NULL ) {
 561                 --lr->lr_parent->lr_outrefcnt;
 562         } else {
 563                 /* free all referrals (child requests) */
 564                 for ( tmplr = lr->lr_refnext; tmplr != NULL; tmplr = nextlr ) {
 565                         nextlr = tmplr->lr_refnext;
 566                         ldap_free_request( ld, tmplr );
 567                 }
 568         }
 569
 570         if ( lr->lr_prev == NULL ) {
 571                 ld->ld_requests = lr->lr_next;
 572         } else {
 573                 lr->lr_prev->lr_next = lr->lr_next;
 574         }
 575
 576         if ( lr->lr_next != NULL ) {
 577                 lr->lr_next->lr_prev = lr->lr_prev;
 578         }
 579
 580         if ( lr->lr_ber != NULL ) {
 581                 ber_free( lr->lr_ber, 1 );
 582         }
 583
 584         if ( lr->lr_res_error != NULL ) {
 585                 free( lr->lr_res_error );
 586         }
 587
 588         if ( lr->lr_res_matched != NULL ) {
 589                 free( lr->lr_res_matched );
 590         }
 591
 592         free( lr );
 593 }
 594
 595
 596 static void
 597 free_servers( LDAPServer *srvlist )
 598 {
 599     LDAPServer  *nextsrv;
 600
 601     while ( srvlist != NULL ) {
 602         nextsrv = srvlist->lsrv_next;
 603         if ( srvlist->lsrv_dn != NULL ) {
 604                 free( srvlist->lsrv_dn );
 605         }
 606         if ( srvlist->lsrv_host != NULL ) {
 607                 free( srvlist->lsrv_host );
 608         }
 609         free( srvlist );
 610         srvlist = nextsrv;
 611     }
 612 }
 613 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS || LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 614
 615
 616 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS
 617 /*
 618  * XXX merging of errors in this routine needs to be improved
 619  */
 620 int
 621 ldap_chase_referrals( LDAP *ld, LDAPRequest *lr, char **errstrp, int *hadrefp )
 622 {
 623         int             rc, count, len, newdn;
 624 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 625         int             ldapref;
 626 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 627         char            *p, *ports, *ref, *tmpref, *refdn, *unfollowed;
 628         LDAPRequest     *origreq;
 629         LDAPServer      *srv;
 630         BerElement      *ber;
 631
 632         Debug( LDAP_DEBUG_TRACE, "ldap_chase_referrals\n", 0, 0, 0 );
 633
 634         ld->ld_errno = LDAP_SUCCESS;    /* optimistic */
 635         *hadrefp = 0;
 636
 637         if ( *errstrp == NULL ) {
 638                 return( 0 );
 639         }
 640
 641         len = strlen( *errstrp );
 642         for ( p = *errstrp; len >= LDAP_REF_STR_LEN; ++p, --len ) {
 643                 if (( *p == 'R' || *p == 'r' ) && strncasecmp( p,
 644                     LDAP_REF_STR, LDAP_REF_STR_LEN ) == 0 ) {
 645                         *p = '\0';
 646                         p += LDAP_REF_STR_LEN;
 647                         break;
 648                 }
 649         }
 650
 651         if ( len < LDAP_REF_STR_LEN ) {
 652                 return( 0 );
 653         }
 654
 655         if ( lr->lr_parentcnt >= ld->ld_refhoplimit ) {
 656                 Debug( LDAP_DEBUG_ANY,
 657                     "more than %d referral hops (dropping)\n",
 658                     ld->ld_refhoplimit, 0, 0 );
 659                     /* XXX report as error in ld->ld_errno? */
 660                     return( 0 );
 661         }
 662
 663         /* find original request */
 664         for ( origreq = lr; origreq->lr_parent != NULL;
 665              origreq = origreq->lr_parent ) {
 666                 ;
 667         }
 668
 669         unfollowed = NULL;
 670         rc = count = 0;
 671
 672         /* parse out & follow referrals */
 673         for ( ref = p; rc == 0 && ref != NULL; ref = p ) {
 674 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 675                 ldapref = 0;
 676 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 677
 678                 if (( p = strchr( ref, '\n' )) != NULL ) {
 679                         *p++ = '\0';
 680                 } else {
 681                         p = NULL;
 682                 }
 683
 684                 len = strlen( ref );
 685                 if ( len > LDAP_LDAP_REF_STR_LEN && strncasecmp( ref,
 686                     LDAP_LDAP_REF_STR, LDAP_LDAP_REF_STR_LEN ) == 0 ) {
 687                         Debug( LDAP_DEBUG_TRACE,
 688                             "chasing LDAP referral: <%s>\n", ref, 0, 0 );
 689 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 690                         ldapref = 1;
 691 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 692                         tmpref = ref + LDAP_LDAP_REF_STR_LEN;
 693 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 694                 } else if ( len > LDAP_DX_REF_STR_LEN && strncasecmp( ref,
 695                     LDAP_DX_REF_STR, LDAP_DX_REF_STR_LEN ) == 0 ) {
 696                         Debug( LDAP_DEBUG_TRACE,
 697                             "chasing DX referral: <%s>\n", ref, 0, 0 );
 698                         tmpref = ref + LDAP_DX_REF_STR_LEN;
 699 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 700                 } else {
 701                         Debug( LDAP_DEBUG_TRACE,
 702                             "ignoring unknown referral <%s>\n", ref, 0, 0 );
 703                         rc = ldap_append_referral( ld, &unfollowed, ref );
 704                         *hadrefp = 1;
 705                         continue;
 706                 }
 707
 708                 *hadrefp = 1;
 709                 if (( refdn = strchr( tmpref, '/' )) != NULL ) {
 710                         *refdn++ = '\0';
 711                         newdn = 1;
 712                 } else {
 713                         newdn = 0;
 714                 }
 715
 716                 if (( ber = re_encode_request( ld, origreq->lr_ber,
 717                     ++ld->ld_msgid, &refdn )) == NULL ) {
 718                         return( -1 );
 719                 }
 720
 721 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 722                 if ( ldapref ) {
 723 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 724                         if (( srv = (LDAPServer *)calloc( 1,
 725                             sizeof( LDAPServer ))) == NULL ) {
 726                                 ber_free( ber, 1 );
 727                                 ld->ld_errno = LDAP_NO_MEMORY;
 728                                 return( -1 );
 729                         }
 730
 731                         if (( srv->lsrv_host = strdup( tmpref )) == NULL ) {
 732                                 free( (char *)srv );
 733                                 ber_free( ber, 1 );
 734                                 ld->ld_errno = LDAP_NO_MEMORY;
 735                                 return( -1 );
 736                         }
 737
 738                         if (( ports = strchr( srv->lsrv_host, ':' )) != NULL ) {
 739                                 *ports++ = '\0';
 740                                 srv->lsrv_port = atoi( ports );
 741                         } else {
 742                                 srv->lsrv_port = openldap_ldap_global_options.ldo_defport;
 743                         }
 744 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 745                 } else {
 746                         srv = dn2servers( ld, tmpref );
 747                 }
 748 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */
 749
 750                 if ( srv != NULL && ldap_send_server_request( ld, ber, ld->ld_msgid,
 751                     lr, srv, NULL, 1 ) >= 0 ) {
 752                         ++count;
 753                 } else {
 754                         Debug( LDAP_DEBUG_ANY,
 755                             "Unable to chase referral (%s)\n",
 756                             ldap_err2string( ld->ld_errno ), 0, 0 );
 757                         rc = ldap_append_referral( ld, &unfollowed, ref );
 758                 }
 759
 760                 if ( !newdn && refdn != NULL ) {
 761                         free( refdn );
 762                 }
 763         }
 764
 765         free( *errstrp );
 766         *errstrp = unfollowed;
 767
 768         return(( rc == 0 ) ? count : rc );
 769 }
 770
 771
 772 int
 773 ldap_append_referral( LDAP *ld, char **referralsp, char *s )
 774 {
 775         int     first;
 776
 777         if ( *referralsp == NULL ) {
 778                 first = 1;
 779                 *referralsp = (char *)malloc( strlen( s ) + LDAP_REF_STR_LEN
 780                     + 1 );
 781         } else {
 782                 first = 0;
 783                 *referralsp = (char *)realloc( *referralsp,
 784                     strlen( *referralsp ) + strlen( s ) + 2 );
 785         }
 786
 787         if ( *referralsp == NULL ) {
 788                 ld->ld_errno = LDAP_NO_MEMORY;
 789                 return( -1 );
 790         }
 791
 792         if ( first ) {
 793                 strcpy( *referralsp, LDAP_REF_STR );
 794         } else {
 795                 strcat( *referralsp, "\n" );
 796         }
 797         strcat( *referralsp, s );
 798
 799         return( 0 );
 800 }
 801
 802
 803
 804 static BerElement *
 805 re_encode_request( LDAP *ld, BerElement *origber, int msgid, char **dnp )
 806 {
 807 /*
 808  * XXX this routine knows way too much about how the lber library works!
 809  */
 810         unsigned long   along, tag;
 811         long            ver;
 812         int             rc;
 813         BerElement      tmpber, *ber;
 814         char            *orig_dn;
 815
 816         Debug( LDAP_DEBUG_TRACE,
 817             "re_encode_request: new msgid %d, new dn <%s>\n",
 818             msgid, ( *dnp == NULL ) ? "NONE" : *dnp, 0 );
 819
 820         tmpber = *origber;
 821
 822         /*
 823          * all LDAP requests are sequences that start with a message id,
 824          * followed by a sequence that is tagged with the operation code
 825          */
 826         if ( ber_scanf( &tmpber, "{i", &along ) != LDAP_TAG_MSGID ||
 827             ( tag = ber_skip_tag( &tmpber, &along )) == LBER_DEFAULT ) {
 828                 ld->ld_errno = LDAP_DECODING_ERROR;
 829                 return( NULL );
 830         }
 831
 832         if (( ber = ldap_alloc_ber_with_options( ld )) == NULLBER ) {
 833                 return( NULL );
 834         }
 835
 836         /* bind requests have a version number before the DN & other stuff */
 837         if ( tag == LDAP_REQ_BIND && ber_get_int( &tmpber, (long *)&ver ) ==
 838             LBER_DEFAULT ) {
 839                 ld->ld_errno = LDAP_DECODING_ERROR;
 840                 ber_free( ber, 1 );
 841                 return( NULL );
 842         }
 843
 844         /* the rest of the request is the DN followed by other stuff */
 845         if ( ber_get_stringa( &tmpber, &orig_dn ) == LBER_DEFAULT ) {
 846                 ber_free( ber, 1 );
 847                 return( NULL );
 848         }
 849
 850         if ( *dnp == NULL ) {
 851                 *dnp = orig_dn;
 852         } else {
 853                 free( orig_dn );
 854         }
 855
 856         if ( tag == LDAP_REQ_BIND ) {
 857                 rc = ber_printf( ber, "{it{is", msgid, tag, ver, *dnp );
 858         } else {
 859                 rc = ber_printf( ber, "{it{s", msgid, tag, *dnp );
 860         }
 861
 862         if ( rc == -1 ) {
 863                 ber_free( ber, 1 );
 864                 return( NULL );
 865         }
 866
 867         if ( ber_write( ber, tmpber.ber_ptr, ( tmpber.ber_end -
 868             tmpber.ber_ptr ), 0 ) != ( tmpber.ber_end - tmpber.ber_ptr ) ||
 869             ber_printf( ber, "}}" ) == -1 ) {
 870                 ld->ld_errno = LDAP_ENCODING_ERROR;
 871                 ber_free( ber, 1 );
 872                 return( NULL );
 873         }
 874
 875 #ifdef LDAP_DEBUG
 876         if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
 877                 Debug( LDAP_DEBUG_ANY, "re_encode_request new request is:\n",
 878                     0, 0, 0 );
 879                 lber_log_dump( LDAP_DEBUG_BER, ldap_debug, ber, 0 );
 880         }
 881 #endif /* LDAP_DEBUG */
 882
 883         return( ber );
 884 }
 885
 886
 887 LDAPRequest *
 888 ldap_find_request_by_msgid( LDAP *ld, int msgid )
 889 {
 890         LDAPRequest     *lr;
 891
 892         for ( lr = ld->ld_requests; lr != NULL; lr = lr->lr_next ) {
 893                 if ( msgid == lr->lr_msgid ) {
 894                         break;
 895                 }
 896         }
 897
 898         return( lr );
 899 }
 900 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
 901
 902
 903 #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_DNS
 904 static LDAPServer *
 905 dn2servers( LDAP *ld, char *dn )        /* dn can also be a domain.... */
 906 {
 907         char            *p, *domain, *host, *server_dn, **dxs;
 908         int             i, port;
 909         LDAPServer      *srvlist, *prevsrv, *srv;
 910
 911         if (( domain = strrchr( dn, '@' )) != NULL ) {
 912                 ++domain;
 913         } else {
 914                 domain = dn;
 915         }
 916
 917         if (( dxs = ldap_getdxbyname( domain )) == NULL ) {
 918                 ld->ld_errno = LDAP_NO_MEMORY;
 919                 return( NULL );
 920         }
 921
 922         srvlist = NULL;
 923
 924         for ( i = 0; dxs[ i ] != NULL; ++i ) {
 925                 port = openldap_ldap_global_options.ldo_defport;
 926                 server_dn = NULL;
 927                 if ( strchr( dxs[ i ], ':' ) == NULL ) {
 928                         host = dxs[ i ];
 929                 } else if ( strlen( dxs[ i ] ) >= 7 &&
 930                     strncmp( dxs[ i ], "ldap://", 7 ) == 0 ) {
 931                         host = dxs[ i ] + 7;
 932                         if (( p = strchr( host, ':' )) == NULL ) {
 933                                 p = host;
 934                         } else {
 935                                 *p++ = '\0';
 936                                 port = atoi( p );
 937                         }
 938                         if (( p = strchr( p, '/' )) != NULL ) {
 939                                 server_dn = ++p;
 940                                 if ( *server_dn == '\0' ) {
 941                                         server_dn = NULL;
 942                                 }
 943                         }
 944                 } else {
 945                         host = NULL;
 946                 }
 947
 948                 if ( host != NULL ) {   /* found a server we can use */
 949                         if (( srv = (LDAPServer *)calloc( 1,
 950                             sizeof( LDAPServer ))) == NULL ) {
 951                                 free_servers( srvlist );
 952                                 srvlist = NULL;
 953                                 break;          /* exit loop & return */
 954                         }
 955
 956                         /* add to end of list of servers */
 957                         if ( srvlist == NULL ) {
 958                                 srvlist = srv;
 959                         } else {
 960                                 prevsrv->lsrv_next = srv;
 961                         }
 962                         prevsrv = srv;
 963
 964                         /* copy in info. */
 965                         if (( srv->lsrv_host = strdup( host )) == NULL ||
 966                             ( server_dn != NULL && ( srv->lsrv_dn =
 967                             strdup( server_dn )) == NULL )) {
 968                                 free_servers( srvlist );
 969                                 srvlist = NULL;
 970                                 break;          /* exit loop & return */
 971                         }
 972                         srv->lsrv_port = port;
 973                 }
 974         }
 975
 976         ldap_value_free( dxs );
 977
 978         if ( srvlist == NULL ) {
 979                 ld->ld_errno = LDAP_SERVER_DOWN;
 980         }
 981
 982         return( srvlist );
 983 }
 984 #endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_DNS */