git.sur5r.net Git - openldap/blob - servers/slapd/overlays/syncprov.c

   1 /* syncprov.c - syncrepl provider */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2004 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 /* ACKNOWLEDGEMENTS:
  16  * This work was initially developed by Howard Chu for inclusion in
  17  * OpenLDAP Software.
  18  */
  19
  20 #include "portable.h"
  21
  22 #ifdef SLAPD_OVER_SYNCPROV
  23
  24 #include <ac/string.h>
  25 #include "lutil.h"
  26 #include "slap.h"
  27
  28 /* A modify request on a particular entry */
  29 typedef struct modinst {
  30         struct modinst *mi_next;
  31         Operation *mi_op;
  32 } modinst;
  33
  34 typedef struct modtarget {
  35         struct modinst *mt_mods;
  36         struct modinst *mt_tail;
  37         Operation *mt_op;
  38         ldap_pvt_thread_mutex_t mt_mutex;
  39 } modtarget;
  40
  41 /* A queued result of a persistent search */
  42 typedef struct syncres {
  43         struct syncres *s_next;
  44         struct berval s_dn;
  45         struct berval s_ndn;
  46         struct berval s_uuid;
  47         struct berval s_csn;
  48         char s_mode;
  49         char s_isreference;
  50 } syncres;
  51
  52 /* Record of a persistent search */
  53 typedef struct syncops {
  54         struct syncops *s_next;
  55         struct berval   s_base;         /* ndn of search base */
  56         ID              s_eid;          /* entryID of search base */
  57         Operation       *s_op;          /* search op */
  58         long    s_sid;
  59         long    s_rid;
  60         struct berval s_filterstr;
  61         int             s_flags;        /* search status */
  62         int             s_inuse;        /* reference count */
  63         struct syncres *s_res;
  64         struct syncres *s_restail;
  65         ldap_pvt_thread_mutex_t s_mutex;
  66 } syncops;
  67
  68 static int      sync_cid;
  69
  70 /* A received sync control */
  71 typedef struct sync_control {
  72         struct sync_cookie sr_state;
  73         int sr_rhint;
  74 } sync_control;
  75
  76 /* o_sync_mode uses data bits of o_sync */
  77 #define o_sync  o_ctrlflag[sync_cid]
  78 #define o_sync_mode     o_ctrlflag[sync_cid]
  79
  80 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  81 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  84
  85 #define PS_IS_REFRESHING        0x01
  86
  87 /* Record of which searches matched at premodify step */
  88 typedef struct syncmatches {
  89         struct syncmatches *sm_next;
  90         syncops *sm_op;
  91 } syncmatches;
  92
  93 /* The main state for this overlay */
  94 typedef struct syncprov_info_t {
  95         syncops         *si_ops;
  96         struct berval   si_ctxcsn;      /* ldapsync context */
  97         int             si_chkops;      /* checkpointing info */
  98         int             si_chktime;
  99         int             si_numops;      /* number of ops since last checkpoint */
 100         time_t  si_chklast;     /* time of last checkpoint */
 101         Avlnode *si_mods;       /* entries being modified */
 102         ldap_pvt_thread_mutex_t si_csn_mutex;
 103         ldap_pvt_thread_mutex_t si_ops_mutex;
 104         ldap_pvt_thread_mutex_t si_mods_mutex;
 105         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 106 } syncprov_info_t;
 107
 108 typedef struct opcookie {
 109         slap_overinst *son;
 110         syncmatches *smatches;
 111         struct berval sdn;      /* DN of entry, for deletes */
 112         struct berval sndn;
 113         struct berval suuid;    /* UUID of entry */
 114         struct berval sctxcsn;
 115         int sreference; /* Is the entry a reference? */
 116 } opcookie;
 117
 118 typedef struct fbase_cookie {
 119         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 120         syncops *fss;   /* persistent search we're testing against */
 121         int fbase;      /* if TRUE we found the search base and it's still valid */
 122         int fscope;     /* if TRUE then fdn is within the psearch scope */
 123 } fbase_cookie;
 124
 125 static AttributeName csn_anlist[2];
 126 static AttributeName uuid_anlist[2];
 127
 128 /* Build a LDAPsync intermediate state control */
 129 static int
 130 syncprov_state_ctrl(
 131         Operation       *op,
 132         SlapReply       *rs,
 133         Entry           *e,
 134         int                     entry_sync_state,
 135         LDAPControl     **ctrls,
 136         int                     num_ctrls,
 137         int                     send_cookie,
 138         struct berval   *cookie)
 139 {
 140         Attribute* a;
 141         int ret;
 142         int res;
 143         const char *text = NULL;
 144
 145         BerElementBuffer berbuf;
 146         BerElement *ber = (BerElement *)&berbuf;
 147
 148         struct berval entryuuid_bv      = BER_BVNULL;
 149
 150         ber_init2( ber, 0, LBER_USE_DER );
 151         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 152
 153         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 154
 155         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 156                 AttributeDescription *desc = a->a_desc;
 157                 if ( desc == slap_schema.si_ad_entryUUID ) {
 158                         entryuuid_bv = a->a_nvals[0];
 159                         break;
 160                 }
 161         }
 162
 163         if ( send_cookie && cookie ) {
 164                 ber_printf( ber, "{eOON}",
 165                         entry_sync_state, &entryuuid_bv, cookie );
 166         } else {
 167                 ber_printf( ber, "{eON}",
 168                         entry_sync_state, &entryuuid_bv );
 169         }
 170
 171         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 172         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 173         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 174
 175         ber_free_buf( ber );
 176
 177         if ( ret < 0 ) {
 178                 Debug( LDAP_DEBUG_TRACE,
 179                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 180                         0, 0, 0 );
 181                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 182                 return ret;
 183         }
 184
 185         return LDAP_SUCCESS;
 186 }
 187
 188 /* Build a LDAPsync final state control */
 189 static int
 190 syncprov_done_ctrl(
 191         Operation       *op,
 192         SlapReply       *rs,
 193         LDAPControl     **ctrls,
 194         int                     num_ctrls,
 195         int                     send_cookie,
 196         struct berval *cookie,
 197         int                     refreshDeletes )
 198 {
 199         int ret;
 200         BerElementBuffer berbuf;
 201         BerElement *ber = (BerElement *)&berbuf;
 202
 203         ber_init2( ber, NULL, LBER_USE_DER );
 204         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 205
 206         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 207
 208         ber_printf( ber, "{" );
 209         if ( send_cookie && cookie ) {
 210                 ber_printf( ber, "O", cookie );
 211         }
 212         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 213                 ber_printf( ber, "b", refreshDeletes );
 214         }
 215         ber_printf( ber, "N}" );
 216
 217         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 218         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 219         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 220
 221         ber_free_buf( ber );
 222
 223         if ( ret < 0 ) {
 224                 Debug( LDAP_DEBUG_TRACE,
 225                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 226                         0, 0, 0 );
 227                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 228                 return ret;
 229         }
 230
 231         return LDAP_SUCCESS;
 232 }
 233
 234 #if 0
 235 /* Generate state based on session log - not implemented yet */
 236 static int
 237 syncprov_state_ctrl_from_slog(
 238         Operation       *op,
 239         SlapReply       *rs,
 240         struct slog_entry *slog_e,
 241         int                     entry_sync_state,
 242         LDAPControl     **ctrls,
 243         int                     num_ctrls,
 244         int                     send_cookie,
 245         struct berval   *cookie)
 246 {
 247         Attribute* a;
 248         int ret;
 249         int res;
 250         const char *text = NULL;
 251
 252         BerElementBuffer berbuf;
 253         BerElement *ber = (BerElement *)&berbuf;
 254
 255         struct berval entryuuid_bv      = BER_BVNULL;
 256
 257         ber_init2( ber, NULL, LBER_USE_DER );
 258         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 259
 260         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 261
 262         entryuuid_bv = slog_e->sl_uuid;
 263
 264         if ( send_cookie && cookie ) {
 265                 ber_printf( ber, "{eOON}",
 266                         entry_sync_state, &entryuuid_bv, cookie );
 267         } else {
 268                 ber_printf( ber, "{eON}",
 269                         entry_sync_state, &entryuuid_bv );
 270         }
 271
 272         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 273         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 274         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 275
 276         ber_free_buf( ber );
 277
 278         if ( ret < 0 ) {
 279                 Debug( LDAP_DEBUG_TRACE,
 280                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 281                         0, 0, 0 );
 282                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 283                 return ret;
 284         }
 285
 286         return LDAP_SUCCESS;
 287 }
 288 #endif
 289
 290 static int
 291 syncprov_sendinfo(
 292         Operation       *op,
 293         SlapReply       *rs,
 294         int                     type,
 295         struct berval *cookie,
 296         int                     refreshDone,
 297         BerVarray       syncUUIDs,
 298         int                     refreshDeletes )
 299 {
 300         BerElementBuffer berbuf;
 301         BerElement *ber = (BerElement *)&berbuf;
 302         struct berval rspdata;
 303
 304         int ret;
 305
 306         ber_init2( ber, NULL, LBER_USE_DER );
 307         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 308
 309         if ( type ) {
 310                 switch ( type ) {
 311                 case LDAP_TAG_SYNC_NEW_COOKIE:
 312                         ber_printf( ber, "tO", type, cookie );
 313                         break;
 314                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 315                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 316                         ber_printf( ber, "t{", type );
 317                         if ( cookie ) {
 318                                 ber_printf( ber, "O", cookie );
 319                         }
 320                         if ( refreshDone == 0 ) {
 321                                 ber_printf( ber, "b", refreshDone );
 322                         }
 323                         ber_printf( ber, "N}" );
 324                         break;
 325                 case LDAP_TAG_SYNC_ID_SET:
 326                         ber_printf( ber, "t{", type );
 327                         if ( cookie ) {
 328                                 ber_printf( ber, "O", cookie );
 329                         }
 330                         if ( refreshDeletes == 1 ) {
 331                                 ber_printf( ber, "b", refreshDeletes );
 332                         }
 333                         ber_printf( ber, "[W]", syncUUIDs );
 334                         ber_printf( ber, "N}" );
 335                         break;
 336                 default:
 337                         Debug( LDAP_DEBUG_TRACE,
 338                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 339                                 type, 0, 0 );
 340                         return LDAP_OTHER;
 341                 }
 342         }
 343
 344         ret = ber_flatten2( ber, &rspdata, 0 );
 345
 346         if ( ret < 0 ) {
 347                 Debug( LDAP_DEBUG_TRACE,
 348                         "syncprov_sendinfo: ber_flatten2 failed\n",
 349                         0, 0, 0 );
 350                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 351                 return ret;
 352         }
 353
 354         rs->sr_rspoid = LDAP_SYNC_INFO;
 355         rs->sr_rspdata = &rspdata;
 356         send_ldap_intermediate( op, rs );
 357         rs->sr_rspdata = NULL;
 358         ber_free_buf( ber );
 359
 360         return LDAP_SUCCESS;
 361 }
 362
 363 /* Find a modtarget in an AVL tree */
 364 static int
 365 sp_avl_cmp( const void *c1, const void *c2 )
 366 {
 367         const modtarget *m1, *m2;
 368         int rc;
 369
 370         m1 = c1; m2 = c2;
 371         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 372
 373         if ( rc ) return rc;
 374         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 375 }
 376
 377 /* syncprov_findbase:
 378  *   finds the true DN of the base of a search (with alias dereferencing) and
 379  * checks to make sure the base entry doesn't get replaced with a different
 380  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 381  * change is detected, any persistent search on this base must be terminated /
 382  * reloaded.
 383  *   On the first call, we just save the DN and entryID. On subsequent calls
 384  * we compare the DN and entryID with the saved values.
 385  */
 386 static int
 387 findbase_cb( Operation *op, SlapReply *rs )
 388 {
 389         slap_callback *sc = op->o_callback;
 390
 391         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 392                 fbase_cookie *fc = sc->sc_private;
 393
 394                 /* If no entryID, we're looking for the first time.
 395                  * Just store whatever we got.
 396                  */
 397                 if ( fc->fss->s_eid == NOID ) {
 398                         fc->fbase = 1;
 399                         fc->fss->s_eid = rs->sr_entry->e_id;
 400                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 401
 402                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 403                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 404
 405                 /* OK, the DN is the same and the entryID is the same. Now
 406                  * see if the fdn resides in the scope.
 407                  */
 408                         fc->fbase = 1;
 409                         switch ( fc->fss->s_op->ors_scope ) {
 410                         case LDAP_SCOPE_BASE:
 411                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 412                                 break;
 413                         case LDAP_SCOPE_ONELEVEL: {
 414                                 struct berval pdn;
 415                                 dnParent( fc->fdn, &pdn );
 416                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 417                                 break; }
 418                         case LDAP_SCOPE_SUBTREE:
 419                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 420                                 break;
 421 #ifdef LDAP_SCOPE_SUBORDINATE
 422                         case LDAP_SCOPE_SUBORDINATE:
 423                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 424                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 425                                 break;
 426 #endif
 427                         }
 428                 }
 429         }
 430         return LDAP_SUCCESS;
 431 }
 432
 433 static int
 434 syncprov_findbase( Operation *op, fbase_cookie *fc )
 435 {
 436         opcookie *opc = op->o_callback->sc_private;
 437         slap_overinst *on = opc->son;
 438         syncprov_info_t         *si = on->on_bi.bi_private;
 439
 440         slap_callback cb = {0};
 441         Operation fop;
 442         SlapReply frs = { REP_RESULT };
 443         int rc;
 444
 445         fop = *op;
 446
 447         cb.sc_response = findbase_cb;
 448         cb.sc_private = fc;
 449
 450         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 451         fop.o_callback = &cb;
 452         fop.o_tag = LDAP_REQ_SEARCH;
 453         fop.ors_scope = LDAP_SCOPE_BASE;
 454         fop.ors_deref = fc->fss->s_op->ors_deref;
 455         fop.ors_slimit = 1;
 456         fop.ors_tlimit = SLAP_NO_LIMIT;
 457         fop.ors_attrs = slap_anlist_no_attrs;
 458         fop.ors_attrsonly = 1;
 459         fop.ors_filter = fc->fss->s_op->ors_filter;
 460         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 461
 462         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 463
 464         fop.o_bd->bd_info = on->on_info->oi_orig;
 465         rc = fop.o_bd->be_search( &fop, &frs );
 466         fop.o_bd->bd_info = (BackendInfo *)on;
 467
 468         if ( fc->fbase ) return LDAP_SUCCESS;
 469
 470         /* If entryID has changed, then the base of this search has
 471          * changed. Invalidate the psearch.
 472          */
 473         return LDAP_NO_SUCH_OBJECT;
 474 }
 475
 476 /* syncprov_findcsn:
 477  *   This function has two different purposes, but they both use a search
 478  * that filters on entryCSN so they're combined here.
 479  * 1: when the current contextCSN is known and we have a sync cookie, we search
 480  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 481  * entry is found, the cookie CSN is valid, otherwise it is stale.
 482  *
 483  * 2: during a refresh phase, we search for all entries with CSN <= the cookie
 484  * CSN, and generate Present records for them. We always collect this result
 485  * in SyncID sets, even if there's only one match.
 486  */
 487 #define FIND_CSN        1
 488 #define FIND_PRESENT    2
 489
 490 static int
 491 findcsn_cb( Operation *op, SlapReply *rs )
 492 {
 493         slap_callback *sc = op->o_callback;
 494
 495         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 496                 sc->sc_private = (void *)1;
 497         }
 498         return LDAP_SUCCESS;
 499 }
 500
 501 /* Build a list of entryUUIDs for sending in a SyncID set */
 502
 503 typedef struct fpres_cookie {
 504         int num;
 505         BerVarray uuids;
 506 } fpres_cookie;
 507
 508 static int
 509 findpres_cb( Operation *op, SlapReply *rs )
 510 {
 511         slap_callback *sc = op->o_callback;
 512         fpres_cookie *pc = sc->sc_private;
 513         int ret = SLAP_CB_CONTINUE;
 514
 515         if ( rs->sr_type == REP_SEARCH ) {
 516                 ret = slap_build_syncUUID_set( op, &pc->uuids, rs->sr_entry );
 517                 if ( ret > 0 ) {
 518                         pc->num++;
 519                         ret = LDAP_SUCCESS;
 520                         if ( pc->num == SLAP_SYNCUUID_SET_SIZE ) {
 521                                 ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 522                                         0, pc->uuids, 0 );
 523                                 ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 524                                 pc->uuids = NULL;
 525                                 pc->num = 0;
 526                         }
 527                 } else {
 528                         ret = LDAP_OTHER;
 529                 }
 530         } else if ( rs->sr_type == REP_RESULT ) {
 531                 ret = rs->sr_err;
 532                 if ( pc->num ) {
 533                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 534                                 0, pc->uuids, 0 );
 535                         ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 536                         pc->uuids = NULL;
 537                         pc->num = 0;
 538                 }
 539         }
 540         return ret;
 541 }
 542
 543
 544 static int
 545 syncprov_findcsn( Operation *op, int mode )
 546 {
 547         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 548         syncprov_info_t         *si = on->on_bi.bi_private;
 549
 550         slap_callback cb = {0};
 551         Operation fop;
 552         SlapReply frs = { REP_RESULT };
 553         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 554         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 555         struct berval fbuf;
 556         Filter cf;
 557         AttributeAssertion eq;
 558         int rc;
 559         fpres_cookie pcookie;
 560         int locked = 0;
 561         sync_control *srs = op->o_controls[sync_cid];
 562
 563         if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 564                 return LDAP_OTHER;
 565         }
 566
 567         fop = *op;
 568         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 569
 570         fbuf.bv_val = buf;
 571         if ( mode == FIND_CSN ) {
 572                 fop.ors_attrsonly = 1;
 573                 fop.ors_attrs = slap_anlist_no_attrs;
 574                 fop.ors_slimit = 1;
 575                 cb.sc_private = NULL;
 576                 cb.sc_response = findcsn_cb;
 577
 578         } else if ( mode == FIND_PRESENT ) {
 579                 fop.ors_attrsonly = 0;
 580                 fop.ors_attrs = uuid_anlist;
 581                 fop.ors_slimit = SLAP_NO_LIMIT;
 582                 /* We want pure entries, not referrals */
 583                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 584                 cb.sc_private = &pcookie;
 585                 cb.sc_response = findpres_cb;
 586                 pcookie.num = 0;
 587                 pcookie.uuids = NULL;
 588         }
 589         cf.f_choice = LDAP_FILTER_LE;
 590         cf.f_ava = &eq;
 591         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 592         cf.f_av_value = *srs->sr_state.ctxcsn;
 593         cf.f_next = NULL;
 594         fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 595                 srs->sr_state.ctxcsn->bv_val );
 596
 597         fop.o_callback = &cb;
 598         fop.ors_tlimit = SLAP_NO_LIMIT;
 599         fop.ors_filter = &cf;
 600         fop.ors_filterstr = fbuf;
 601
 602         fop.o_bd->bd_info = on->on_info->oi_orig;
 603         rc = fop.o_bd->be_search( &fop, &frs );
 604         fop.o_bd->bd_info = (BackendInfo *)on;
 605
 606         if ( mode == FIND_CSN ) {
 607                 if ( cb.sc_private ) return LDAP_SUCCESS;
 608         } else if ( mode == FIND_PRESENT ) {
 609                 return LDAP_SUCCESS;
 610         }
 611
 612         /* If matching CSN was not found, invalidate the context. */
 613         return LDAP_NO_SUCH_OBJECT;
 614 }
 615
 616 /* Queue a persistent search response if still in Refresh stage */
 617 static int
 618 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 619 {
 620         syncres *sr;
 621
 622         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 623                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 624         sr->s_next = NULL;
 625         sr->s_dn.bv_val = (char *)(sr + 1);
 626         sr->s_mode = mode;
 627         sr->s_isreference = opc->sreference;
 628         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 629         *(sr->s_ndn.bv_val++) = '\0';
 630         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 631         *(sr->s_uuid.bv_val++) = '\0';
 632         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 633
 634         if ( !so->s_res ) {
 635                 so->s_res = sr;
 636         } else {
 637                 so->s_restail->s_next = sr;
 638         }
 639         so->s_restail = sr;
 640         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 641         return LDAP_SUCCESS;
 642 }
 643
 644 /* Send a persistent search response */
 645 static int
 646 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 647 {
 648         slap_overinst *on = opc->son;
 649         syncprov_info_t *si = on->on_bi.bi_private;
 650
 651         SlapReply rs = { REP_SEARCH };
 652         LDAPControl *ctrls[2];
 653         struct berval cookie;
 654         Entry e_uuid = {0};
 655         Attribute a_uuid = {0};
 656         Operation sop = *so->s_op;
 657         Opheader ohdr;
 658
 659         ohdr = *sop.o_hdr;
 660         sop.o_hdr = &ohdr;
 661         sop.o_tmpmemctx = op->o_tmpmemctx;
 662         sop.o_bd = op->o_bd;
 663         sop.o_controls = op->o_controls;
 664
 665         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 666                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 667                 if ( so->s_flags & PS_IS_REFRESHING )
 668                         return syncprov_qresp( opc, so, mode );
 669                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 670         }
 671
 672         ctrls[1] = NULL;
 673         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn,
 674                 so->s_sid, so->s_rid );
 675
 676         e_uuid.e_attrs = &a_uuid;
 677         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 678         a_uuid.a_nvals = &opc->suuid;
 679         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 680                 mode, ctrls, 0, 1, &cookie );
 681
 682         rs.sr_entry = e;
 683         rs.sr_ctrls = ctrls;
 684         switch( mode ) {
 685         case LDAP_SYNC_ADD:
 686                 if ( opc->sreference ) {
 687                         rs.sr_ref = get_entry_referrals( &sop, e );
 688                         send_search_reference( &sop, &rs );
 689                         ber_bvarray_free( rs.sr_ref );
 690                         break;
 691                 }
 692                 /* fallthru */
 693         case LDAP_SYNC_MODIFY:
 694                 rs.sr_attrs = sop.ors_attrs;
 695                 send_search_entry( &sop, &rs );
 696                 break;
 697         case LDAP_SYNC_DELETE:
 698                 e_uuid.e_attrs = NULL;
 699                 e_uuid.e_name = opc->sdn;
 700                 e_uuid.e_nname = opc->sndn;
 701                 rs.sr_entry = &e_uuid;
 702                 if ( opc->sreference ) {
 703                         struct berval bv;
 704                         bv.bv_val = NULL;
 705                         bv.bv_len = 0;
 706                         rs.sr_ref = &bv;
 707                         send_search_reference( &sop, &rs );
 708                 } else {
 709                         send_search_entry( &sop, &rs );
 710                 }
 711                 break;
 712         default:
 713                 assert(0);
 714         }
 715         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 716         rs.sr_ctrls = NULL;
 717         return rs.sr_err;
 718 }
 719
 720 static void
 721 syncprov_free_syncop( syncops *so )
 722 {
 723         syncres *sr, *srnext;
 724
 725         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 726         so->s_inuse--;
 727         if ( so->s_inuse > 0 ) {
 728                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 729                 return;
 730         }
 731         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 732         filter_free( so->s_op->ors_filter );
 733         ch_free( so->s_op );
 734         ch_free( so->s_base.bv_val );
 735         for ( sr=so->s_res; sr; sr=srnext ) {
 736                 srnext = sr->s_next;
 737                 ch_free( sr );
 738         }
 739         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 740         ch_free( so );
 741 }
 742
 743 static int
 744 syncprov_drop_psearch( syncops *so )
 745 {
 746         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 747         so->s_op->o_conn->c_n_ops_executing--;
 748         so->s_op->o_conn->c_n_ops_completed++;
 749         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 750         syncprov_free_syncop( so );
 751 }
 752
 753 static int
 754 syncprov_op_abandon( Operation *op, SlapReply *rs )
 755 {
 756         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 757         syncprov_info_t         *si = on->on_bi.bi_private;
 758         syncops *so, *soprev;
 759
 760         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 761         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 762                 soprev=so, so=so->s_next ) {
 763                 if ( so->s_op->o_connid == op->o_connid &&
 764                         so->s_op->o_msgid == op->orn_msgid ) {
 765                                 so->s_op->o_abandon = 1;
 766                                 soprev->s_next = so->s_next;
 767                                 break;
 768                 }
 769         }
 770         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 771         if ( so ) {
 772                 /* Is this really a Cancel exop? */
 773                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 774                         rs->sr_err = LDAP_CANCELLED;
 775                         send_ldap_result( so->s_op, rs );
 776                 }
 777                 syncprov_drop_psearch( so );
 778         }
 779         return SLAP_CB_CONTINUE;
 780 }
 781
 782 /* Find which persistent searches are affected by this operation */
 783 static void
 784 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 785 {
 786         slap_overinst *on = opc->son;
 787         syncprov_info_t         *si = on->on_bi.bi_private;
 788
 789         fbase_cookie fc;
 790         syncops *ss, *sprev, *snext;
 791         Entry *e;
 792         Attribute *a;
 793         int rc;
 794         struct berval newdn;
 795
 796         fc.fdn = &op->o_req_ndn;
 797         /* compute new DN */
 798         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 799                 struct berval pdn;
 800                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 801                 else dnParent( fc.fdn, &pdn );
 802                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 803                 fc.fdn = &newdn;
 804         }
 805         if ( op->o_tag != LDAP_REQ_ADD ) {
 806                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 807                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 808                 op->o_bd->bd_info = (BackendInfo *)on;
 809                 if ( rc ) return;
 810         } else {
 811                 e = op->ora_e;
 812         }
 813
 814         if ( saveit ) {
 815                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 816                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 817                 opc->sreference = is_entry_referral( e );
 818         }
 819         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 820                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 821                 if ( a )
 822                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 823         }
 824
 825         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 826         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 827                 sprev = ss, ss=snext)
 828         {
 829                 syncmatches *sm;
 830                 int found = 0;
 831
 832                 snext = ss->s_next;
 833                 /* validate base */
 834                 fc.fss = ss;
 835                 fc.fbase = 0;
 836                 fc.fscope = 0;
 837
 838                 /* If the base of the search is missing, signal a refresh */
 839                 rc = syncprov_findbase( op, &fc );
 840                 if ( rc != LDAP_SUCCESS ) {
 841                         SlapReply rs = {REP_RESULT};
 842                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 843                                 "search base has changed" );
 844                         sprev->s_next = snext;
 845                         syncprov_drop_psearch( ss );
 846                         continue;
 847                 }
 848
 849                 /* If we're sending results now, look for this op in old matches */
 850                 if ( !saveit ) {
 851                         syncmatches *old;
 852                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 853                                 old=sm, sm=sm->sm_next ) {
 854                                 if ( sm->sm_op == ss ) {
 855                                         found = 1;
 856                                         old->sm_next = sm->sm_next;
 857                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 858                                         break;
 859                                 }
 860                         }
 861                 }
 862
 863                 /* check if current o_req_dn is in scope and matches filter */
 864                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 865                         LDAP_COMPARE_TRUE ) {
 866                         if ( saveit ) {
 867                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 868                                 sm->sm_next = opc->smatches;
 869                                 sm->sm_op = ss;
 870                                 ss->s_inuse++;
 871                                 opc->smatches = sm;
 872                         } else {
 873                                 /* if found send UPDATE else send ADD */
 874                                 syncprov_sendresp( op, opc, ss, e,
 875                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
 876                         }
 877                 } else if ( !saveit && found ) {
 878                         /* send DELETE */
 879                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
 880                 }
 881         }
 882         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 883         if ( op->o_tag != LDAP_REQ_ADD ) {
 884                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 885                 be_entry_release_r( op, e );
 886                 op->o_bd->bd_info = (BackendInfo *)on;
 887         }
 888 }
 889
 890 static int
 891 syncprov_op_cleanup( Operation *op, SlapReply *rs )
 892 {
 893         slap_callback *cb = op->o_callback;
 894         opcookie *opc = cb->sc_private;
 895         slap_overinst *on = opc->son;
 896         syncprov_info_t         *si = on->on_bi.bi_private;
 897         syncmatches *sm, *snext;
 898         modtarget *mt, mtdummy;
 899
 900         for (sm = opc->smatches; sm; sm=snext) {
 901                 snext = sm->sm_next;
 902                 syncprov_free_syncop( sm->sm_op );
 903                 op->o_tmpfree( sm, op->o_tmpmemctx );
 904         }
 905
 906         /* Remove op from lock table */
 907         mtdummy.mt_op = op;
 908         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
 909         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
 910         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
 911         if ( mt ) {
 912                 modinst *mi = mt->mt_mods;
 913
 914                 /* If there are more, promote the next one */
 915                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
 916                 if ( mi->mi_next ) {
 917                         mt->mt_mods = mi->mi_next;
 918                         mt->mt_op = mt->mt_mods->mi_op;
 919                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 920                 } else {
 921                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
 922                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
 923                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
 924                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 925                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
 926                         ch_free( mt );
 927                 }
 928         }
 929         op->o_callback = cb->sc_next;
 930         op->o_tmpfree(cb, op->o_tmpmemctx);
 931 }
 932
 933 static void
 934 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
 935 {
 936         syncprov_info_t         *si = on->on_bi.bi_private;
 937         Modifications mod;
 938         Operation opm;
 939         struct berval bv[2];
 940         BackendInfo *orig;
 941         slap_callback cb = {0};
 942
 943         mod.sml_values = bv;
 944         bv[1].bv_val = NULL;
 945         bv[0] = si->si_ctxcsn;
 946         mod.sml_nvalues = NULL;
 947         mod.sml_desc = slap_schema.si_ad_contextCSN;
 948         mod.sml_op = LDAP_MOD_REPLACE;
 949         mod.sml_next = NULL;
 950
 951         cb.sc_response = slap_null_cb;
 952         opm = *op;
 953         opm.o_tag = LDAP_REQ_MODIFY;
 954         opm.o_callback = &cb;
 955         opm.orm_modlist = &mod;
 956         opm.o_req_dn = op->o_bd->be_suffix[0];
 957         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
 958         orig = opm.o_bd->bd_info;
 959         opm.o_bd->bd_info = on->on_info->oi_orig;
 960         opm.o_bd->be_modify( &opm, rs );
 961 }
 962
 963 static int
 964 syncprov_op_response( Operation *op, SlapReply *rs )
 965 {
 966         opcookie *opc = op->o_callback->sc_private;
 967         slap_overinst *on = opc->son;
 968         syncprov_info_t         *si = on->on_bi.bi_private;
 969         syncmatches *sm;
 970
 971         if ( rs->sr_err == LDAP_SUCCESS )
 972         {
 973                 struct berval maxcsn;
 974                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 975
 976                 /* Update our context CSN */
 977                 cbuf[0] = '\0';
 978                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
 979                 slap_get_commit_csn( op, &maxcsn );
 980                 if ( maxcsn.bv_val ) {
 981                         strcpy( cbuf, maxcsn.bv_val );
 982                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
 983                                 strcpy( si->si_ctxcsnbuf, cbuf );
 984                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 985                         }
 986                 }
 987
 988                 si->si_numops++;
 989                 if ( si->si_chkops || si->si_chktime ) {
 990                         int do_check=0;
 991                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
 992                                 do_check = 1;
 993                                 si->si_numops = 0;
 994                         }
 995                         if ( si->si_chktime &&
 996                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
 997                                 do_check = 1;
 998                                 si->si_chklast = op->o_time;
 999                         }
1000                         if ( do_check ) {
1001                                 syncprov_checkpoint( op, rs, on );
1002                         }
1003                 }
1004                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1005
1006                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1007                 opc->sctxcsn.bv_val = cbuf;
1008
1009                 /* Handle any persistent searches */
1010                 if ( si->si_ops ) {
1011                         switch(op->o_tag) {
1012                         case LDAP_REQ_ADD:
1013                         case LDAP_REQ_MODIFY:
1014                         case LDAP_REQ_MODRDN:
1015                         case LDAP_REQ_EXTENDED:
1016                                 syncprov_matchops( op, opc, 0 );
1017                                 break;
1018                         case LDAP_REQ_DELETE:
1019                                 /* for each match in opc->smatches:
1020                                  *   send DELETE msg
1021                                  */
1022                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1023                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1024                                         if ( sm->sm_op->s_op->o_abandon )
1025                                                 continue;
1026                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1027                                                 LDAP_SYNC_DELETE, 1 );
1028                                 }
1029                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1030                                 break;
1031                         }
1032                 }
1033
1034         }
1035         return SLAP_CB_CONTINUE;
1036 }
1037
1038 /* We don't use a subentry to store the context CSN any more.
1039  * We expose the current context CSN as an operational attribute
1040  * of the suffix entry.
1041  */
1042 static int
1043 syncprov_op_compare( Operation *op, SlapReply *rs )
1044 {
1045         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1046         syncprov_info_t         *si = on->on_bi.bi_private;
1047         int rc = SLAP_CB_CONTINUE;
1048
1049         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1050                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1051         {
1052                 Entry e = {0};
1053                 Attribute a = {0};
1054                 struct berval bv[2];
1055
1056                 e.e_name = op->o_bd->be_suffix[0];
1057                 e.e_nname = op->o_bd->be_nsuffix[0];
1058
1059                 bv[1].bv_val = NULL;
1060                 bv[0] = si->si_ctxcsn;
1061
1062                 a.a_desc = slap_schema.si_ad_contextCSN;
1063                 a.a_vals = bv;
1064                 a.a_nvals = a.a_vals;
1065
1066                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1067
1068                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1069                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1070                 if ( ! rs->sr_err ) {
1071                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1072                         goto return_results;
1073                 }
1074
1075                 if ( get_assert( op ) &&
1076                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1077                 {
1078                         rs->sr_err = LDAP_ASSERTION_FAILED;
1079                         goto return_results;
1080                 }
1081
1082
1083                 rs->sr_err = LDAP_COMPARE_FALSE;
1084
1085                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1086                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1087                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1088                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1089                 {
1090                         rs->sr_err = LDAP_COMPARE_TRUE;
1091                 }
1092
1093 return_results:;
1094
1095                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1096
1097                 send_ldap_result( op, rs );
1098
1099                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1100                         rs->sr_err = LDAP_SUCCESS;
1101                 }
1102                 rc = rs->sr_err;
1103         }
1104
1105         return rc;
1106 }
1107
1108 static int
1109 syncprov_op_mod( Operation *op, SlapReply *rs )
1110 {
1111         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1112         syncprov_info_t         *si = on->on_bi.bi_private;
1113
1114         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1115                 sizeof(opcookie) +
1116                 (si->si_ops ? sizeof(modinst) : 0 ),
1117                 op->o_tmpmemctx);
1118         opcookie *opc = (opcookie *)(cb+1);
1119         opc->son = on;
1120         cb->sc_response = syncprov_op_response;
1121         cb->sc_cleanup = syncprov_op_cleanup;
1122         cb->sc_private = opc;
1123         cb->sc_next = op->o_callback;
1124         op->o_callback = cb;
1125
1126         /* If there are active persistent searches, lock this operation.
1127          * See seqmod.c for the locking logic on its own.
1128          */
1129         if ( si->si_ops ) {
1130                 modtarget *mt, mtdummy;
1131                 modinst *mi;
1132
1133                 mi = (modinst *)(opc+1);
1134                 mi->mi_op = op;
1135
1136                 /* See if we're already modifying this entry... */
1137                 mtdummy.mt_op = op;
1138                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1139                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1140                 if ( mt ) {
1141                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1142                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1143                         mt->mt_tail->mi_next = mi;
1144                         mt->mt_tail = mi;
1145                         /* wait for this op to get to head of list */
1146                         while ( mt->mt_mods != mi ) {
1147                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1148                                 ldap_pvt_thread_yield();
1149                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1150                         }
1151                 } else {
1152                         /* Record that we're modifying this entry now */
1153                         mt = malloc( sizeof(modtarget) );
1154                         mt->mt_mods = mi;
1155                         mt->mt_tail = mi;
1156                         mt->mt_op = mi->mi_op;
1157                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1158                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1159                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1160                 }
1161
1162                 if ( op->o_tag != LDAP_REQ_ADD )
1163                         syncprov_matchops( op, opc, 1 );
1164         }
1165
1166         return SLAP_CB_CONTINUE;
1167 }
1168
1169 static int
1170 syncprov_op_extended( Operation *op, SlapReply *rs )
1171 {
1172         if ( exop_is_write( op ))
1173                 return syncprov_op_mod( op, rs );
1174
1175         return SLAP_CB_CONTINUE;
1176 }
1177
1178 typedef struct searchstate {
1179         slap_overinst *ss_on;
1180         syncops *ss_so;
1181 } searchstate;
1182
1183 static int
1184 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1185 {
1186 #if 0
1187         if ( rs->sr_ctrls ) {
1188                 free( rs->sr_ctrls[0] );
1189                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1190                 rs->sr_ctrls = NULL;
1191         }
1192 #endif
1193         return 0;
1194 }
1195
1196 static void
1197 syncprov_detach_op( Operation *op, syncops *so )
1198 {
1199         Operation *op2;
1200         int i, alen = 0;
1201         size_t size;
1202         char *ptr;
1203
1204         /* count the search attrs */
1205         for (i=0; op->ors_attrs && op->ors_attrs[i].an_name.bv_val; i++) {
1206                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1207         }
1208         /* Make a new copy of the operation */
1209         size = sizeof(Operation) + sizeof(Opheader) +
1210                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1211                 op->o_req_dn.bv_len + 1 +
1212                 op->o_req_ndn.bv_len + 1 +
1213                 op->o_ndn.bv_len + 1 +
1214                 so->s_filterstr.bv_len + 1;
1215         op2 = (Operation *)ch_malloc( size );
1216         *op2 = *op;
1217         op2->o_hdr = (Opheader *)(op2+1);
1218         *op2->o_hdr = *op->o_hdr;
1219         if ( i ) {
1220                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1221                 ptr = (char *)(op2->ors_attrs+i+1);
1222                 for (i=0; op->ors_attrs[i].an_name.bv_val; i++) {
1223                         op2->ors_attrs[i] = op->ors_attrs[i];
1224                         op2->ors_attrs[i].an_name.bv_val = ptr;
1225                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1226                 }
1227                 op2->ors_attrs[i].an_name.bv_val = NULL;
1228                 op2->ors_attrs[i].an_name.bv_len = 0;
1229         } else {
1230                 ptr = (char *)(op2->o_hdr + 1);
1231         }
1232         op2->o_ndn.bv_val = ptr;
1233         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1234         op2->o_dn = op2->o_ndn;
1235         op2->o_req_dn.bv_val = ptr;
1236         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1237         op2->o_req_ndn.bv_val = ptr;
1238         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1239         op2->ors_filterstr.bv_val = ptr;
1240         strcpy( ptr, so->s_filterstr.bv_val );
1241         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1242         op2->ors_filter = str2filter( ptr );
1243         op2->o_controls = NULL;
1244         op2->o_callback = NULL;
1245         so->s_op = op2;
1246
1247         /* Increment number of ops so that idletimeout ignores us */
1248         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1249         op->o_conn->c_n_ops_executing++;
1250         op->o_conn->c_n_ops_completed--;
1251         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1252 }
1253
1254 static int
1255 syncprov_search_response( Operation *op, SlapReply *rs )
1256 {
1257         searchstate *ss = op->o_callback->sc_private;
1258         slap_overinst *on = ss->ss_on;
1259         syncprov_info_t         *si = on->on_bi.bi_private;
1260         sync_control *srs = op->o_controls[sync_cid];
1261
1262         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1263                 int i;
1264                 if ( srs->sr_state.ctxcsn ) {
1265                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1266                                 slap_schema.si_ad_entryCSN );
1267                         /* Don't send the ctx entry twice */
1268                         if ( bvmatch( &a->a_nvals[0], srs->sr_state.ctxcsn ))
1269                                 return LDAP_SUCCESS;
1270                 }
1271                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1272                         op->o_tmpmemctx );
1273                 rs->sr_ctrls[1] = NULL;
1274                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1275                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1276         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1277                 struct berval cookie;
1278
1279                 slap_compose_sync_cookie( op, &cookie,
1280                         &op->ors_filter->f_and->f_ava->aa_value,
1281                         srs->sr_state.sid, srs->sr_state.rid );
1282
1283                 /* Is this a regular refresh? */
1284                 if ( !ss->ss_so ) {
1285                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1286                                 op->o_tmpmemctx );
1287                         rs->sr_ctrls[1] = NULL;
1288                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1289                                 0, 1, &cookie, LDAP_SYNC_REFRESH_PRESENTS );
1290                 } else {
1291                         int locked = 0;
1292                 /* It's RefreshAndPersist, transition to Persist phase */
1293                         syncprov_sendinfo( op, rs, rs->sr_nentries ?
1294                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1295                                 &cookie, 1, NULL, 0 );
1296                         /* Flush any queued persist messages */
1297                         if ( ss->ss_so->s_res ) {
1298                                 syncres *sr, *srnext;
1299                                 Entry *e;
1300                                 opcookie opc;
1301
1302                                 opc.son = on;
1303                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1304                                 locked = 1;
1305                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1306                                         int rc = LDAP_SUCCESS;
1307                                         srnext = sr->s_next;
1308                                         opc.sdn = sr->s_dn;
1309                                         opc.sndn = sr->s_ndn;
1310                                         opc.suuid = sr->s_uuid;
1311                                         opc.sctxcsn = sr->s_csn;
1312                                         opc.sreference = sr->s_isreference;
1313                                         e = NULL;
1314
1315                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1316                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1317                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1318                                                 op->o_bd->bd_info = (BackendInfo *)on;
1319                                         }
1320                                         if ( rc == LDAP_SUCCESS )
1321                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1322                                                         sr->s_mode, 0 );
1323
1324                                         if ( e ) {
1325                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1326                                                 be_entry_release_r( op, e );
1327                                                 op->o_bd->bd_info = (BackendInfo *)on;
1328                                         }
1329                                         ch_free( sr );
1330                                 }
1331                                 ss->ss_so->s_res = NULL;
1332                                 ss->ss_so->s_restail = NULL;
1333                         }
1334
1335                         /* Turn off the refreshing flag */
1336                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1337                         if ( locked )
1338                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1339
1340                         /* Detach this Op from frontend control */
1341                         syncprov_detach_op( op, ss->ss_so );
1342
1343                         return LDAP_SUCCESS;
1344                 }
1345         }
1346
1347         return SLAP_CB_CONTINUE;
1348 }
1349
1350 static int
1351 syncprov_op_search( Operation *op, SlapReply *rs )
1352 {
1353         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1354         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1355         slap_callback   *cb;
1356         int gotstate = 0, nochange = 0;
1357         Filter *fand, *fava;
1358         syncops *sop = NULL;
1359         searchstate *ss;
1360         sync_control *srs;
1361
1362         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1363
1364         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1365                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1366                 return rs->sr_err;
1367         }
1368
1369         srs = op->o_controls[sync_cid];
1370
1371         /* If this is a persistent search, set it up right away */
1372         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1373                 syncops so = {0};
1374                 fbase_cookie fc;
1375                 opcookie opc;
1376                 slap_callback sc;
1377
1378                 fc.fss = &so;
1379                 fc.fbase = 0;
1380                 so.s_eid = NOID;
1381                 so.s_op = op;
1382                 so.s_flags = PS_IS_REFRESHING;
1383                 /* syncprov_findbase expects to be called as a callback... */
1384                 sc.sc_private = &opc;
1385                 opc.son = on;
1386                 cb = op->o_callback;
1387                 op->o_callback = &sc;
1388                 rs->sr_err = syncprov_findbase( op, &fc );
1389                 op->o_callback = cb;
1390
1391                 if ( rs->sr_err != LDAP_SUCCESS ) {
1392                         send_ldap_result( op, rs );
1393                         return rs->sr_err;
1394                 }
1395                 sop = ch_malloc( sizeof( syncops ));
1396                 *sop = so;
1397                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1398                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1399                 sop->s_sid = srs->sr_state.sid;
1400                 sop->s_rid = srs->sr_state.rid;
1401                 sop->s_next = si->si_ops;
1402                 sop->s_inuse = 1;
1403                 si->si_ops = sop;
1404                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1405         }
1406
1407         /* If we have a cookie, handle the PRESENT lookups
1408          */
1409         if ( srs->sr_state.ctxcsn ) {
1410                 /* Is the CSN in a valid format? */
1411                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
1412                         send_ldap_error( op, rs, LDAP_OTHER, "invalid sync cookie" );
1413                         return rs->sr_err;
1414                 }
1415                 /* Is the CSN still present in the database? */
1416                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1417                         /* No, so a reload is required */
1418 #if 0           /* the consumer doesn't seem to send this hint */
1419                         if ( op->o_sync_rhint == 0 ) {
1420                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1421                                 return rs->sr_err;
1422                         }
1423 #endif
1424                 } else {
1425                         gotstate = 1;
1426                         /* If just Refreshing and nothing has changed, shortcut it */
1427                         if ( bvmatch( srs->sr_state.ctxcsn, &si->si_ctxcsn )) {
1428                                 nochange = 1;
1429                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1430                                         LDAPControl     *ctrls[2];
1431
1432                                         ctrls[0] = NULL;
1433                                         ctrls[1] = NULL;
1434                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1435                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
1436                                         rs->sr_ctrls = ctrls;
1437                                         rs->sr_err = LDAP_SUCCESS;
1438                                         send_ldap_result( op, rs );
1439                                         rs->sr_ctrls = NULL;
1440                                         return rs->sr_err;
1441                                 }
1442                                 goto shortcut;
1443                         } else
1444                         /* If context has changed, check for Present UUIDs */
1445                         if ( syncprov_findcsn( op, FIND_PRESENT ) != LDAP_SUCCESS ) {
1446                                 send_ldap_result( op, rs );
1447                                 return rs->sr_err;
1448                         }
1449                 }
1450         }
1451
1452         /* Append CSN range to search filter, save original filter
1453          * for persistent search evaluation
1454          */
1455         if ( sop ) {
1456                 sop->s_filterstr= op->ors_filterstr;
1457         }
1458
1459         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1460         fand->f_choice = LDAP_FILTER_AND;
1461         fand->f_next = NULL;
1462         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1463         fava->f_choice = LDAP_FILTER_LE;
1464         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1465         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1466         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1467         ber_dupbv_x( &fava->f_ava->aa_value, &si->si_ctxcsn, op->o_tmpmemctx );
1468         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1469         fand->f_and = fava;
1470         if ( gotstate ) {
1471                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1472                 fava = fava->f_next;
1473                 fava->f_choice = LDAP_FILTER_GE;
1474                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1475                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1476                 ber_dupbv_x( &fava->f_ava->aa_value, srs->sr_state.ctxcsn, op->o_tmpmemctx );
1477         }
1478         fava->f_next = op->ors_filter;
1479         op->ors_filter = fand;
1480         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1481
1482 shortcut:
1483         /* Let our callback add needed info to returned entries */
1484         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1485         ss = (searchstate *)(cb+1);
1486         ss->ss_on = on;
1487         ss->ss_so = sop;
1488         cb->sc_response = syncprov_search_response;
1489         cb->sc_cleanup = syncprov_search_cleanup;
1490         cb->sc_private = ss;
1491         cb->sc_next = op->o_callback;
1492         op->o_callback = cb;
1493
1494 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1495         op->o_sync_mode &= SLAP_CONTROL_MASK;
1496 #endif
1497
1498         /* If this is a persistent search and no changes were reported during
1499          * the refresh phase, just invoke the response callback to transition
1500          * us into persist phase
1501          */
1502         if ( nochange ) {
1503                 rs->sr_err = LDAP_SUCCESS;
1504                 rs->sr_nentries = 0;
1505                 send_ldap_result( op, rs );
1506                 return rs->sr_err;
1507         }
1508         return SLAP_CB_CONTINUE;
1509 }
1510
1511 static int
1512 syncprov_operational(
1513         Operation *op,
1514         SlapReply *rs )
1515 {
1516         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1517         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1518
1519         if ( rs->sr_entry &&
1520                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1521
1522                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1523                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1524                         Attribute *a, **ap = NULL;
1525
1526
1527                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1528                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1529                                         break;
1530                         }
1531
1532                         if ( !a ) {
1533                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1534
1535                                 a = ch_malloc( sizeof(Attribute));
1536                                 a->a_desc = slap_schema.si_ad_contextCSN;
1537                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1538                                 a->a_vals[1].bv_val = NULL;
1539                                 a->a_nvals = a->a_vals;
1540                                 a->a_next = NULL;
1541                                 a->a_flags = 0;
1542                                 *ap = a;
1543                         }
1544
1545                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1546                         if ( !ap ) {
1547                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1548                         } else {
1549                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1550                         }
1551                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1552                 }
1553         }
1554         return LDAP_SUCCESS;
1555 }
1556
1557 static int
1558 syncprov_db_config(
1559         BackendDB       *be,
1560         const char      *fname,
1561         int             lineno,
1562         int             argc,
1563         char    **argv
1564 )
1565 {
1566         slap_overinst           *on = (slap_overinst *)be->bd_info;
1567         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1568
1569 #if 0
1570         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1571                 if ( argc != 3 ) {
1572                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1573                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1574                         return -1;
1575                 }
1576                 si->si_chkops = atoi( argv[1] );
1577                 si->si_chktime = atoi( argv[2] ) * 60;
1578
1579         } else {
1580                 return SLAP_CONF_UNKNOWN;
1581         }
1582 #endif
1583
1584         return SLAP_CONF_UNKNOWN;
1585 }
1586
1587 /* Cheating - we have no thread pool context for these functions,
1588  * so make one.
1589  */
1590 typedef struct thread_keys {
1591         void *key;
1592         void *data;
1593         ldap_pvt_thread_pool_keyfree_t *free;
1594 } thread_keys;
1595
1596 /* A fake thread context */
1597 static thread_keys thrctx[8];
1598
1599 /* Read any existing contextCSN from the underlying db.
1600  * Then search for any entries newer than that. If no value exists,
1601  * just generate it. Cache whatever result.
1602  */
1603 static int
1604 syncprov_db_open(
1605     BackendDB *be
1606 )
1607 {
1608     slap_overinst   *on = (slap_overinst *) be->bd_info;
1609     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1610
1611         char opbuf[OPERATION_BUFFER_SIZE];
1612         Operation *op = (Operation *)opbuf;
1613         Entry *e;
1614         Attribute *a;
1615         int rc;
1616
1617         memset(opbuf, 0, sizeof(opbuf));
1618         op->o_hdr = (Opheader *)(op+1);
1619         op->o_bd = be;
1620         op->o_dn = be->be_rootdn;
1621         op->o_ndn = be->be_rootndn;
1622         op->o_threadctx = thrctx;
1623         op->o_tmpmfuncs = &ch_mfuncs;
1624
1625         op->o_bd->bd_info = on->on_info->oi_orig;
1626         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
1627                 slap_schema.si_ad_contextCSN, 0, &e );
1628
1629         if ( e ) {
1630                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
1631                 if ( a ) {
1632                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
1633                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
1634                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
1635                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
1636                                 si->si_ctxcsn.bv_len );
1637                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
1638                 }
1639                 be_entry_release_r( op, e );
1640         }
1641         op->o_bd->bd_info = (BackendInfo *)on;
1642     return 0;
1643 }
1644
1645 /* Write the current contextCSN into the underlying db.
1646  */
1647 static int
1648 syncprov_db_close(
1649     BackendDB *be
1650 )
1651 {
1652     slap_overinst   *on = (slap_overinst *) be->bd_info;
1653     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1654         int i;
1655
1656         if ( si->si_numops ) {
1657                 Connection conn;
1658                 char opbuf[OPERATION_BUFFER_SIZE];
1659                 Operation *op = (Operation *)opbuf;
1660                 SlapReply rs = {REP_RESULT};
1661
1662                 connection_fake_init( &conn, op, thrctx );
1663                 op->o_bd = be;
1664                 op->o_dn = be->be_rootdn;
1665                 op->o_ndn = be->be_rootndn;
1666                 syncprov_checkpoint( op, &rs, on );
1667         }
1668         for ( i=0; thrctx[i].key; i++) {
1669                 if ( thrctx[i].free )
1670                         thrctx[i].free( thrctx[i].key, thrctx[i].data );
1671         }
1672
1673     return 0;
1674 }
1675
1676 static int
1677 syncprov_db_init(
1678         BackendDB *be
1679 )
1680 {
1681         slap_overinst   *on = (slap_overinst *)be->bd_info;
1682         syncprov_info_t *si;
1683
1684         si = ch_calloc(1, sizeof(syncprov_info_t));
1685         on->on_bi.bi_private = si;
1686         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
1687         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
1688         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
1689         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
1690
1691         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
1692         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
1693
1694         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
1695         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
1696
1697         return 0;
1698 }
1699
1700 static int
1701 syncprov_db_destroy(
1702         BackendDB *be
1703 )
1704 {
1705         slap_overinst   *on = (slap_overinst *)be->bd_info;
1706         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1707
1708         if ( si ) {
1709                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
1710                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
1711                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
1712                 ch_free( si );
1713         }
1714
1715         return 0;
1716 }
1717
1718 static int syncprov_parseCtrl (
1719         Operation *op,
1720         SlapReply *rs,
1721         LDAPControl *ctrl )
1722 {
1723         ber_tag_t tag;
1724         BerElement *ber;
1725         ber_int_t mode;
1726         ber_len_t len;
1727         struct berval cookie = BER_BVNULL;
1728         sync_control *sr;
1729         int rhint = 0;
1730
1731         if ( op->o_sync != SLAP_CONTROL_NONE ) {
1732                 rs->sr_text = "Sync control specified multiple times";
1733                 return LDAP_PROTOCOL_ERROR;
1734         }
1735
1736         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
1737                 rs->sr_text = "Sync control specified with pagedResults control";
1738                 return LDAP_PROTOCOL_ERROR;
1739         }
1740
1741         if ( ctrl->ldctl_value.bv_len == 0 ) {
1742                 rs->sr_text = "Sync control value is empty (or absent)";
1743                 return LDAP_PROTOCOL_ERROR;
1744         }
1745
1746         /* Parse the control value
1747          *      syncRequestValue ::= SEQUENCE {
1748          *              mode   ENUMERATED {
1749          *                      -- 0 unused
1750          *                      refreshOnly             (1),
1751          *                      -- 2 reserved
1752          *                      refreshAndPersist       (3)
1753          *              },
1754          *              cookie  syncCookie OPTIONAL
1755          *      }
1756          */
1757
1758         ber = ber_init( &ctrl->ldctl_value );
1759         if( ber == NULL ) {
1760                 rs->sr_text = "internal error";
1761                 return LDAP_OTHER;
1762         }
1763
1764         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
1765                 rs->sr_text = "Sync control : mode decoding error";
1766                 return LDAP_PROTOCOL_ERROR;
1767         }
1768
1769         switch( mode ) {
1770         case LDAP_SYNC_REFRESH_ONLY:
1771                 mode = SLAP_SYNC_REFRESH;
1772                 break;
1773         case LDAP_SYNC_REFRESH_AND_PERSIST:
1774                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
1775                 break;
1776         default:
1777                 rs->sr_text = "Sync control : unknown update mode";
1778                 return LDAP_PROTOCOL_ERROR;
1779         }
1780
1781         tag = ber_peek_tag( ber, &len );
1782
1783         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
1784                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
1785                         rs->sr_text = "Sync control : cookie decoding error";
1786                         return LDAP_PROTOCOL_ERROR;
1787                 }
1788         }
1789         if ( tag == LDAP_TAG_RELOAD_HINT ) {
1790                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
1791                         rs->sr_text = "Sync control : rhint decoding error";
1792                         return LDAP_PROTOCOL_ERROR;
1793                 }
1794         }
1795         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
1796                         rs->sr_text = "Sync control : decoding error";
1797                         return LDAP_PROTOCOL_ERROR;
1798         }
1799         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
1800         sr->sr_rhint = rhint;
1801         if (!BER_BVISNULL(&cookie)) {
1802                 ber_bvarray_add( &sr->sr_state.octet_str, &cookie );
1803                 slap_parse_sync_cookie( &sr->sr_state );
1804         }
1805
1806         op->o_controls[sync_cid] = sr;
1807
1808         (void) ber_free( ber, 1 );
1809
1810         op->o_sync = ctrl->ldctl_iscritical
1811                 ? SLAP_CONTROL_CRITICAL
1812                 : SLAP_CONTROL_NONCRITICAL;
1813
1814         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
1815
1816         return LDAP_SUCCESS;
1817 }
1818
1819 /* This overlay is set up for dynamic loading via moduleload. For static
1820  * configuration, you'll need to arrange for the slap_overinst to be
1821  * initialized and registered by some other function inside slapd.
1822  */
1823
1824 static slap_overinst            syncprov;
1825
1826 int
1827 syncprov_init()
1828 {
1829         int rc;
1830
1831         rc = register_supported_control( LDAP_CONTROL_SYNC,
1832                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
1833                 syncprov_parseCtrl, &sync_cid );
1834         if ( rc != LDAP_SUCCESS ) {
1835                 fprintf( stderr, "Failed to register control %d\n", rc );
1836                 return rc;
1837         }
1838
1839         syncprov.on_bi.bi_type = "syncprov";
1840         syncprov.on_bi.bi_db_init = syncprov_db_init;
1841         syncprov.on_bi.bi_db_config = syncprov_db_config;
1842         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
1843         syncprov.on_bi.bi_db_open = syncprov_db_open;
1844         syncprov.on_bi.bi_db_close = syncprov_db_close;
1845
1846         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
1847         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
1848
1849         syncprov.on_bi.bi_op_add = syncprov_op_mod;
1850         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
1851         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
1852         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
1853         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
1854         syncprov.on_bi.bi_op_search = syncprov_op_search;
1855         syncprov.on_bi.bi_extended = syncprov_op_extended;
1856         syncprov.on_bi.bi_operational = syncprov_operational;
1857
1858 #if 0
1859         syncprov.on_response = syncprov_response;
1860 #endif
1861
1862         return overlay_register( &syncprov );
1863 }
1864
1865 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
1866 int
1867 init_module( int argc, char *argv[] )
1868 {
1869         return syncprov_init();
1870 }
1871 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
1872
1873 #endif /* defined(SLAPD_OVER_SYNCPROV) */