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 /* A received sync control */
  69 typedef struct sync_control {
  70         struct sync_cookie sr_state;
  71         int sr_rhint;
  72 } sync_control;
  73
  74 #if 0 /* moved back to slap.h */
  75 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  76 #endif
  77 /* o_sync_mode uses data bits of o_sync */
  78 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  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_rdwr_t  si_mods_rwlock;
 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         if ( rs->sr_err != LDAP_SUCCESS ) {
 431                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 432         }
 433         return LDAP_SUCCESS;
 434 }
 435
 436 static int
 437 syncprov_findbase( Operation *op, fbase_cookie *fc )
 438 {
 439         opcookie *opc = op->o_callback->sc_private;
 440         slap_overinst *on = opc->son;
 441         syncprov_info_t         *si = on->on_bi.bi_private;
 442
 443         slap_callback cb = {0};
 444         Operation fop;
 445         SlapReply frs = { REP_RESULT };
 446         int rc;
 447
 448         fop = *op;
 449
 450         cb.sc_response = findbase_cb;
 451         cb.sc_private = fc;
 452
 453         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 454         fop.o_callback = &cb;
 455         fop.o_tag = LDAP_REQ_SEARCH;
 456         fop.ors_scope = LDAP_SCOPE_BASE;
 457         fop.ors_deref = fc->fss->s_op->ors_deref;
 458         fop.ors_limit = NULL;
 459         fop.ors_slimit = 1;
 460         fop.ors_tlimit = SLAP_NO_LIMIT;
 461         fop.ors_attrs = slap_anlist_no_attrs;
 462         fop.ors_attrsonly = 1;
 463         fop.ors_filter = fc->fss->s_op->ors_filter;
 464         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 465
 466         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 467
 468         fop.o_bd->bd_info = on->on_info->oi_orig;
 469         rc = fop.o_bd->be_search( &fop, &frs );
 470         fop.o_bd->bd_info = (BackendInfo *)on;
 471
 472         if ( fc->fbase ) return LDAP_SUCCESS;
 473
 474         /* If entryID has changed, then the base of this search has
 475          * changed. Invalidate the psearch.
 476          */
 477         return LDAP_NO_SUCH_OBJECT;
 478 }
 479
 480 /* syncprov_findcsn:
 481  *   This function has three different purposes, but they all use a search
 482  * that filters on entryCSN so they're combined here.
 483  * 1: at startup time, after a contextCSN has been read from the database,
 484  * we search for all entries with CSN >= contextCSN in case the contextCSN
 485  * was not checkpointed at the previous shutdown.
 486  *
 487  * 2: when the current contextCSN is known and we have a sync cookie, we search
 488  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 489  * entry is found, the cookie CSN is valid, otherwise it is stale.
 490  *
 491  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 492  * CSN, and generate Present records for them. We always collect this result
 493  * in SyncID sets, even if there's only one match.
 494  */
 495 #define FIND_MAXCSN     1
 496 #define FIND_CSN        2
 497 #define FIND_PRESENT    3
 498
 499 static int
 500 findmax_cb( Operation *op, SlapReply *rs )
 501 {
 502         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 503                 struct berval *maxcsn = op->o_callback->sc_private;
 504                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 505                         slap_schema.si_ad_entryCSN );
 506
 507                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn )) {
 508                         maxcsn->bv_len = a->a_vals[0].bv_len;
 509                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 510                 }
 511         }
 512         return LDAP_SUCCESS;
 513 }
 514
 515 static int
 516 findcsn_cb( Operation *op, SlapReply *rs )
 517 {
 518         slap_callback *sc = op->o_callback;
 519
 520         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 521                 sc->sc_private = (void *)1;
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 /* Build a list of entryUUIDs for sending in a SyncID set */
 527
 528 typedef struct fpres_cookie {
 529         int num;
 530         BerVarray uuids;
 531 } fpres_cookie;
 532
 533 static int
 534 findpres_cb( Operation *op, SlapReply *rs )
 535 {
 536         slap_callback *sc = op->o_callback;
 537         fpres_cookie *pc = sc->sc_private;
 538         int ret = SLAP_CB_CONTINUE;
 539
 540         if ( rs->sr_type == REP_SEARCH ) {
 541                 ret = slap_build_syncUUID_set( op, &pc->uuids, rs->sr_entry );
 542                 if ( ret > 0 ) {
 543                         pc->num++;
 544                         ret = LDAP_SUCCESS;
 545                         if ( pc->num == SLAP_SYNCUUID_SET_SIZE ) {
 546                                 ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 547                                         0, pc->uuids, 0 );
 548                                 ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 549                                 pc->uuids = NULL;
 550                                 pc->num = 0;
 551                         }
 552                 } else {
 553                         ret = LDAP_OTHER;
 554                 }
 555         } else if ( rs->sr_type == REP_RESULT ) {
 556                 ret = rs->sr_err;
 557                 if ( pc->num ) {
 558                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 559                                 0, pc->uuids, 0 );
 560                         ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 561                         pc->uuids = NULL;
 562                         pc->num = 0;
 563                 }
 564         }
 565         return ret;
 566 }
 567
 568
 569 static int
 570 syncprov_findcsn( Operation *op, int mode )
 571 {
 572         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 573         syncprov_info_t         *si = on->on_bi.bi_private;
 574
 575         slap_callback cb = {0};
 576         Operation fop;
 577         SlapReply frs = { REP_RESULT };
 578         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 579         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 580         struct berval fbuf, maxcsn;
 581         Filter cf;
 582         AttributeAssertion eq;
 583         int rc = LDAP_SUCCESS;
 584         fpres_cookie pcookie;
 585         int locked = 0;
 586         sync_control *srs;
 587
 588         if ( mode != FIND_MAXCSN ) {
 589                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 590
 591                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 592                         return LDAP_OTHER;
 593                 }
 594         }
 595
 596         fop = *op;
 597         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 598
 599         fbuf.bv_val = buf;
 600         cf.f_ava = &eq;
 601         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 602         cf.f_next = NULL;
 603
 604         switch( mode ) {
 605         case FIND_MAXCSN:
 606                 cf.f_choice = LDAP_FILTER_GE;
 607                 cf.f_av_value = si->si_ctxcsn;
 608                 fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)",
 609                         cf.f_av_value.bv_val );
 610                 fop.ors_attrsonly = 0;
 611                 fop.ors_attrs = csn_anlist;
 612                 fop.ors_slimit = SLAP_NO_LIMIT;
 613                 cb.sc_private = &maxcsn;
 614                 cb.sc_response = findmax_cb;
 615                 maxcsn.bv_val = cbuf;
 616                 maxcsn.bv_len = 0;
 617                 break;
 618         case FIND_CSN:
 619                 cf.f_choice = LDAP_FILTER_LE;
 620                 cf.f_av_value = *srs->sr_state.ctxcsn;
 621                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 622                         cf.f_av_value.bv_val );
 623                 fop.ors_attrsonly = 1;
 624                 fop.ors_attrs = slap_anlist_no_attrs;
 625                 fop.ors_slimit = 1;
 626                 cb.sc_private = NULL;
 627                 cb.sc_response = findcsn_cb;
 628                 break;
 629         case FIND_PRESENT:
 630                 cf.f_choice = LDAP_FILTER_LE;
 631                 cf.f_av_value = *srs->sr_state.ctxcsn;
 632                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 633                         cf.f_av_value.bv_val );
 634                 fop.ors_attrsonly = 0;
 635                 fop.ors_attrs = uuid_anlist;
 636                 fop.ors_slimit = SLAP_NO_LIMIT;
 637                 /* We want pure entries, not referrals */
 638                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 639                 cb.sc_private = &pcookie;
 640                 cb.sc_response = findpres_cb;
 641                 pcookie.num = 0;
 642                 pcookie.uuids = NULL;
 643                 break;
 644         }
 645         fop.o_callback = &cb;
 646         fop.ors_limit = NULL;
 647         fop.ors_tlimit = SLAP_NO_LIMIT;
 648         fop.ors_filter = &cf;
 649         fop.ors_filterstr = fbuf;
 650
 651         fop.o_bd->bd_info = on->on_info->oi_orig;
 652         fop.o_bd->be_search( &fop, &frs );
 653         fop.o_bd->bd_info = (BackendInfo *)on;
 654
 655         switch( mode ) {
 656         case FIND_MAXCSN:
 657                 if ( maxcsn.bv_len ) {
 658                         strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 659                         si->si_ctxcsn.bv_len = maxcsn.bv_len;
 660                 }
 661                 break;
 662         case FIND_CSN:
 663                 /* If matching CSN was not found, invalidate the context. */
 664                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 665                 break;
 666         case FIND_PRESENT:
 667                 break;
 668         }
 669
 670         return rc;
 671 }
 672
 673 /* Queue a persistent search response if still in Refresh stage */
 674 static int
 675 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 676 {
 677         syncres *sr;
 678
 679         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 680                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 681         sr->s_next = NULL;
 682         sr->s_dn.bv_val = (char *)(sr + 1);
 683         sr->s_mode = mode;
 684         sr->s_isreference = opc->sreference;
 685         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 686         *(sr->s_ndn.bv_val++) = '\0';
 687         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 688         *(sr->s_uuid.bv_val++) = '\0';
 689         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 690
 691         if ( !so->s_res ) {
 692                 so->s_res = sr;
 693         } else {
 694                 so->s_restail->s_next = sr;
 695         }
 696         so->s_restail = sr;
 697         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 698         return LDAP_SUCCESS;
 699 }
 700
 701 /* Send a persistent search response */
 702 static int
 703 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 704 {
 705         slap_overinst *on = opc->son;
 706         syncprov_info_t *si = on->on_bi.bi_private;
 707
 708         SlapReply rs = { REP_SEARCH };
 709         LDAPControl *ctrls[2];
 710         struct berval cookie;
 711         Entry e_uuid = {0};
 712         Attribute a_uuid = {0};
 713         Operation sop = *so->s_op;
 714         Opheader ohdr;
 715
 716         ohdr = *sop.o_hdr;
 717         sop.o_hdr = &ohdr;
 718         sop.o_tmpmemctx = op->o_tmpmemctx;
 719         sop.o_bd = op->o_bd;
 720         sop.o_controls = op->o_controls;
 721
 722         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 723                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 724                 if ( so->s_flags & PS_IS_REFRESHING )
 725                         return syncprov_qresp( opc, so, mode );
 726                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 727         }
 728
 729         ctrls[1] = NULL;
 730         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn,
 731                 so->s_sid, so->s_rid );
 732
 733         e_uuid.e_attrs = &a_uuid;
 734         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 735         a_uuid.a_nvals = &opc->suuid;
 736         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 737                 mode, ctrls, 0, 1, &cookie );
 738
 739         rs.sr_entry = e;
 740         rs.sr_ctrls = ctrls;
 741         switch( mode ) {
 742         case LDAP_SYNC_ADD:
 743                 if ( opc->sreference ) {
 744                         rs.sr_ref = get_entry_referrals( &sop, e );
 745                         send_search_reference( &sop, &rs );
 746                         ber_bvarray_free( rs.sr_ref );
 747                         break;
 748                 }
 749                 /* fallthru */
 750         case LDAP_SYNC_MODIFY:
 751                 rs.sr_attrs = sop.ors_attrs;
 752                 send_search_entry( &sop, &rs );
 753                 break;
 754         case LDAP_SYNC_DELETE:
 755                 e_uuid.e_attrs = NULL;
 756                 e_uuid.e_name = opc->sdn;
 757                 e_uuid.e_nname = opc->sndn;
 758                 rs.sr_entry = &e_uuid;
 759                 if ( opc->sreference ) {
 760                         struct berval bv = BER_BVNULL;
 761                         rs.sr_ref = &bv;
 762                         send_search_reference( &sop, &rs );
 763                 } else {
 764                         send_search_entry( &sop, &rs );
 765                 }
 766                 break;
 767         default:
 768                 assert(0);
 769         }
 770         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 771         rs.sr_ctrls = NULL;
 772         return rs.sr_err;
 773 }
 774
 775 static void
 776 syncprov_free_syncop( syncops *so )
 777 {
 778         syncres *sr, *srnext;
 779
 780         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 781         so->s_inuse--;
 782         if ( so->s_inuse > 0 ) {
 783                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 784                 return;
 785         }
 786         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 787         filter_free( so->s_op->ors_filter );
 788         ch_free( so->s_op );
 789         ch_free( so->s_base.bv_val );
 790         for ( sr=so->s_res; sr; sr=srnext ) {
 791                 srnext = sr->s_next;
 792                 ch_free( sr );
 793         }
 794         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 795         ch_free( so );
 796 }
 797
 798 static int
 799 syncprov_drop_psearch( syncops *so )
 800 {
 801         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 802         so->s_op->o_conn->c_n_ops_executing--;
 803         so->s_op->o_conn->c_n_ops_completed++;
 804         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 805         syncprov_free_syncop( so );
 806 }
 807
 808 static int
 809 syncprov_op_abandon( Operation *op, SlapReply *rs )
 810 {
 811         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 812         syncprov_info_t         *si = on->on_bi.bi_private;
 813         syncops *so, *soprev;
 814
 815         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 816         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 817                 soprev=so, so=so->s_next ) {
 818                 if ( so->s_op->o_connid == op->o_connid &&
 819                         so->s_op->o_msgid == op->orn_msgid ) {
 820                                 so->s_op->o_abandon = 1;
 821                                 soprev->s_next = so->s_next;
 822                                 break;
 823                 }
 824         }
 825         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 826         if ( so ) {
 827                 /* Is this really a Cancel exop? */
 828                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 829                         rs->sr_err = LDAP_CANCELLED;
 830                         send_ldap_result( so->s_op, rs );
 831                 }
 832                 syncprov_drop_psearch( so );
 833         }
 834         return SLAP_CB_CONTINUE;
 835 }
 836
 837 /* Find which persistent searches are affected by this operation */
 838 static void
 839 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 840 {
 841         slap_overinst *on = opc->son;
 842         syncprov_info_t         *si = on->on_bi.bi_private;
 843
 844         fbase_cookie fc;
 845         syncops *ss, *sprev, *snext;
 846         Entry *e;
 847         Attribute *a;
 848         int rc;
 849         struct berval newdn;
 850         int freefdn = 0;
 851
 852         fc.fdn = &op->o_req_ndn;
 853         /* compute new DN */
 854         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 855                 struct berval pdn;
 856                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 857                 else dnParent( fc.fdn, &pdn );
 858                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 859                 fc.fdn = &newdn;
 860                 freefdn = 1;
 861         }
 862         if ( op->o_tag != LDAP_REQ_ADD ) {
 863                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 864                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 865                 op->o_bd->bd_info = (BackendInfo *)on;
 866                 if ( rc ) return;
 867         } else {
 868                 e = op->ora_e;
 869         }
 870
 871         /* Never replicate these */
 872         if ( is_entry_syncConsumerSubentry( e )) {
 873                 goto done;
 874         }
 875         if ( saveit ) {
 876                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 877                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 878                 opc->sreference = is_entry_referral( e );
 879         }
 880         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 881                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 882                 if ( a )
 883                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 884         }
 885
 886         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 887         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 888                 sprev = ss, ss=snext)
 889         {
 890                 syncmatches *sm;
 891                 int found = 0;
 892
 893                 snext = ss->s_next;
 894                 /* validate base */
 895                 fc.fss = ss;
 896                 fc.fbase = 0;
 897                 fc.fscope = 0;
 898
 899                 /* If the base of the search is missing, signal a refresh */
 900                 rc = syncprov_findbase( op, &fc );
 901                 if ( rc != LDAP_SUCCESS ) {
 902                         SlapReply rs = {REP_RESULT};
 903                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 904                                 "search base has changed" );
 905                         sprev->s_next = snext;
 906                         syncprov_drop_psearch( ss );
 907                         continue;
 908                 }
 909
 910                 /* If we're sending results now, look for this op in old matches */
 911                 if ( !saveit ) {
 912                         syncmatches *old;
 913                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 914                                 old=sm, sm=sm->sm_next ) {
 915                                 if ( sm->sm_op == ss ) {
 916                                         found = 1;
 917                                         old->sm_next = sm->sm_next;
 918                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 919                                         break;
 920                                 }
 921                         }
 922                 }
 923
 924                 /* check if current o_req_dn is in scope and matches filter */
 925                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 926                         LDAP_COMPARE_TRUE ) {
 927                         if ( saveit ) {
 928                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 929                                 sm->sm_next = opc->smatches;
 930                                 sm->sm_op = ss;
 931                                 ss->s_inuse++;
 932                                 opc->smatches = sm;
 933                         } else {
 934                                 /* if found send UPDATE else send ADD */
 935                                 syncprov_sendresp( op, opc, ss, e,
 936                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
 937                         }
 938                 } else if ( !saveit && found ) {
 939                         /* send DELETE */
 940                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
 941                 }
 942         }
 943         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 944 done:
 945         if ( op->o_tag != LDAP_REQ_ADD ) {
 946                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 947                 be_entry_release_r( op, e );
 948                 op->o_bd->bd_info = (BackendInfo *)on;
 949         }
 950         if ( freefdn ) {
 951                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
 952         }
 953 }
 954
 955 static int
 956 syncprov_op_cleanup( Operation *op, SlapReply *rs )
 957 {
 958         slap_callback *cb = op->o_callback;
 959         opcookie *opc = cb->sc_private;
 960         slap_overinst *on = opc->son;
 961         syncprov_info_t         *si = on->on_bi.bi_private;
 962         syncmatches *sm, *snext;
 963         modtarget *mt, mtdummy;
 964
 965         for (sm = opc->smatches; sm; sm=snext) {
 966                 snext = sm->sm_next;
 967                 syncprov_free_syncop( sm->sm_op );
 968                 op->o_tmpfree( sm, op->o_tmpmemctx );
 969         }
 970
 971         /* Remove op from lock table */
 972         mtdummy.mt_op = op;
 973         ldap_pvt_thread_rdwr_rlock( &si->si_mods_rwlock );
 974         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
 975         ldap_pvt_thread_rdwr_runlock( &si->si_mods_rwlock );
 976         if ( mt ) {
 977                 modinst *mi = mt->mt_mods;
 978
 979                 /* If there are more, promote the next one */
 980                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
 981                 if ( mi->mi_next ) {
 982                         mt->mt_mods = mi->mi_next;
 983                         mt->mt_op = mt->mt_mods->mi_op;
 984                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 985                 } else {
 986                         ldap_pvt_thread_rdwr_wlock( &si->si_mods_rwlock );
 987                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
 988                         ldap_pvt_thread_rdwr_wunlock( &si->si_mods_rwlock );
 989                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 990                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
 991                         ch_free( mt );
 992                 }
 993         }
 994         if ( !BER_BVISNULL( &opc->suuid ))
 995                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
 996         if ( !BER_BVISNULL( &opc->sndn ))
 997                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
 998         if ( !BER_BVISNULL( &opc->sdn ))
 999                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1000         op->o_callback = cb->sc_next;
1001         op->o_tmpfree(cb, op->o_tmpmemctx);
1002 }
1003
1004 static void
1005 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1006 {
1007         syncprov_info_t         *si = on->on_bi.bi_private;
1008         Modifications mod;
1009         Operation opm;
1010         struct berval bv[2];
1011         BackendInfo *orig;
1012         slap_callback cb = {0};
1013
1014         mod.sml_values = bv;
1015         bv[1].bv_val = NULL;
1016         bv[0] = si->si_ctxcsn;
1017         mod.sml_nvalues = NULL;
1018         mod.sml_desc = slap_schema.si_ad_contextCSN;
1019         mod.sml_op = LDAP_MOD_REPLACE;
1020         mod.sml_next = NULL;
1021
1022         cb.sc_response = slap_null_cb;
1023         opm = *op;
1024         opm.o_tag = LDAP_REQ_MODIFY;
1025         opm.o_callback = &cb;
1026         opm.orm_modlist = &mod;
1027         opm.o_req_dn = op->o_bd->be_suffix[0];
1028         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1029         orig = opm.o_bd->bd_info;
1030         opm.o_bd->bd_info = on->on_info->oi_orig;
1031         opm.o_bd->be_modify( &opm, rs );
1032 }
1033
1034 static int
1035 syncprov_op_response( Operation *op, SlapReply *rs )
1036 {
1037         opcookie *opc = op->o_callback->sc_private;
1038         slap_overinst *on = opc->son;
1039         syncprov_info_t         *si = on->on_bi.bi_private;
1040         syncmatches *sm;
1041
1042         if ( rs->sr_err == LDAP_SUCCESS )
1043         {
1044                 struct berval maxcsn;
1045                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1046
1047                 /* Update our context CSN */
1048                 cbuf[0] = '\0';
1049                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1050                 slap_get_commit_csn( op, &maxcsn );
1051                 if ( !BER_BVISNULL( &maxcsn ) ) {
1052                         strcpy( cbuf, maxcsn.bv_val );
1053                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1054                                 strcpy( si->si_ctxcsnbuf, cbuf );
1055                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1056                         }
1057                 }
1058
1059                 si->si_numops++;
1060                 if ( si->si_chkops || si->si_chktime ) {
1061                         int do_check=0;
1062                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1063                                 do_check = 1;
1064                                 si->si_numops = 0;
1065                         }
1066                         if ( si->si_chktime &&
1067                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1068                                 do_check = 1;
1069                                 si->si_chklast = op->o_time;
1070                         }
1071                         if ( do_check ) {
1072                                 syncprov_checkpoint( op, rs, on );
1073                         }
1074                 }
1075                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1076
1077                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1078                 opc->sctxcsn.bv_val = cbuf;
1079
1080                 /* Handle any persistent searches */
1081                 if ( si->si_ops ) {
1082                         switch(op->o_tag) {
1083                         case LDAP_REQ_ADD:
1084                         case LDAP_REQ_MODIFY:
1085                         case LDAP_REQ_MODRDN:
1086                         case LDAP_REQ_EXTENDED:
1087                                 syncprov_matchops( op, opc, 0 );
1088                                 break;
1089                         case LDAP_REQ_DELETE:
1090                                 /* for each match in opc->smatches:
1091                                  *   send DELETE msg
1092                                  */
1093                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1094                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1095                                         if ( sm->sm_op->s_op->o_abandon )
1096                                                 continue;
1097                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1098                                                 LDAP_SYNC_DELETE, 1 );
1099                                 }
1100                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1101                                 break;
1102                         }
1103                 }
1104
1105         }
1106         return SLAP_CB_CONTINUE;
1107 }
1108
1109 /* We don't use a subentry to store the context CSN any more.
1110  * We expose the current context CSN as an operational attribute
1111  * of the suffix entry.
1112  */
1113 static int
1114 syncprov_op_compare( Operation *op, SlapReply *rs )
1115 {
1116         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1117         syncprov_info_t         *si = on->on_bi.bi_private;
1118         int rc = SLAP_CB_CONTINUE;
1119
1120         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1121                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1122         {
1123                 Entry e = {0};
1124                 Attribute a = {0};
1125                 struct berval bv[2];
1126
1127                 e.e_name = op->o_bd->be_suffix[0];
1128                 e.e_nname = op->o_bd->be_nsuffix[0];
1129
1130                 BER_BVZERO( &bv[1] );
1131                 bv[0] = si->si_ctxcsn;
1132
1133                 a.a_desc = slap_schema.si_ad_contextCSN;
1134                 a.a_vals = bv;
1135                 a.a_nvals = a.a_vals;
1136
1137                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1138
1139                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1140                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1141                 if ( ! rs->sr_err ) {
1142                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1143                         goto return_results;
1144                 }
1145
1146                 if ( get_assert( op ) &&
1147                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1148                 {
1149                         rs->sr_err = LDAP_ASSERTION_FAILED;
1150                         goto return_results;
1151                 }
1152
1153
1154                 rs->sr_err = LDAP_COMPARE_FALSE;
1155
1156                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1157                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1158                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1159                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1160                 {
1161                         rs->sr_err = LDAP_COMPARE_TRUE;
1162                 }
1163
1164 return_results:;
1165
1166                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1167
1168                 send_ldap_result( op, rs );
1169
1170                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1171                         rs->sr_err = LDAP_SUCCESS;
1172                 }
1173                 rc = rs->sr_err;
1174         }
1175
1176         return rc;
1177 }
1178
1179 static int
1180 syncprov_op_mod( Operation *op, SlapReply *rs )
1181 {
1182         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1183         syncprov_info_t         *si = on->on_bi.bi_private;
1184
1185         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1186                 sizeof(opcookie) +
1187                 (si->si_ops ? sizeof(modinst) : 0 ),
1188                 op->o_tmpmemctx);
1189         opcookie *opc = (opcookie *)(cb+1);
1190         opc->son = on;
1191         cb->sc_response = syncprov_op_response;
1192         cb->sc_cleanup = syncprov_op_cleanup;
1193         cb->sc_private = opc;
1194         cb->sc_next = op->o_callback;
1195         op->o_callback = cb;
1196
1197         /* If there are active persistent searches, lock this operation.
1198          * See seqmod.c for the locking logic on its own.
1199          */
1200         if ( si->si_ops ) {
1201                 modtarget *mt, mtdummy;
1202                 modinst *mi;
1203
1204                 mi = (modinst *)(opc+1);
1205                 mi->mi_op = op;
1206
1207                 /* See if we're already modifying this entry... */
1208                 mtdummy.mt_op = op;
1209                 ldap_pvt_thread_rdwr_wlock( &si->si_mods_rwlock );
1210                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1211                 if ( mt ) {
1212                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1213                         ldap_pvt_thread_rdwr_wunlock( &si->si_mods_rwlock );
1214                         mt->mt_tail->mi_next = mi;
1215                         mt->mt_tail = mi;
1216                         /* wait for this op to get to head of list */
1217                         while ( mt->mt_mods != mi ) {
1218                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1219                                 ldap_pvt_thread_yield();
1220                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1221                         }
1222                 } else {
1223                         /* Record that we're modifying this entry now */
1224                         mt = ch_malloc( sizeof(modtarget) );
1225                         mt->mt_mods = mi;
1226                         mt->mt_tail = mi;
1227                         mt->mt_op = mi->mi_op;
1228                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1229                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1230                         ldap_pvt_thread_rdwr_wunlock( &si->si_mods_rwlock );
1231                 }
1232
1233                 if ( op->o_tag != LDAP_REQ_ADD )
1234                         syncprov_matchops( op, opc, 1 );
1235         }
1236
1237         return SLAP_CB_CONTINUE;
1238 }
1239
1240 static int
1241 syncprov_op_extended( Operation *op, SlapReply *rs )
1242 {
1243         if ( exop_is_write( op ))
1244                 return syncprov_op_mod( op, rs );
1245
1246         return SLAP_CB_CONTINUE;
1247 }
1248
1249 typedef struct searchstate {
1250         slap_overinst *ss_on;
1251         syncops *ss_so;
1252 } searchstate;
1253
1254 static int
1255 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1256 {
1257 #if 0
1258         if ( rs->sr_ctrls ) {
1259                 free( rs->sr_ctrls[0] );
1260                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1261                 rs->sr_ctrls = NULL;
1262         }
1263 #endif
1264         return 0;
1265 }
1266
1267 static void
1268 syncprov_detach_op( Operation *op, syncops *so )
1269 {
1270         Operation *op2;
1271         int i, alen = 0;
1272         size_t size;
1273         char *ptr;
1274
1275         /* count the search attrs */
1276         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1277                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1278         }
1279         /* Make a new copy of the operation */
1280         size = sizeof(Operation) + sizeof(Opheader) +
1281                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1282                 op->o_req_dn.bv_len + 1 +
1283                 op->o_req_ndn.bv_len + 1 +
1284                 op->o_ndn.bv_len + 1 +
1285                 so->s_filterstr.bv_len + 1;
1286         op2 = (Operation *)ch_malloc( size );
1287         *op2 = *op;
1288         op2->o_hdr = (Opheader *)(op2+1);
1289         *op2->o_hdr = *op->o_hdr;
1290         if ( i ) {
1291                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1292                 ptr = (char *)(op2->ors_attrs+i+1);
1293                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1294                         op2->ors_attrs[i] = op->ors_attrs[i];
1295                         op2->ors_attrs[i].an_name.bv_val = ptr;
1296                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1297                 }
1298                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1299         } else {
1300                 ptr = (char *)(op2->o_hdr + 1);
1301         }
1302         op2->o_ndn.bv_val = ptr;
1303         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1304         op2->o_dn = op2->o_ndn;
1305         op2->o_req_dn.bv_val = ptr;
1306         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1307         op2->o_req_ndn.bv_val = ptr;
1308         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1309         op2->ors_filterstr.bv_val = ptr;
1310         strcpy( ptr, so->s_filterstr.bv_val );
1311         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1312         op2->ors_filter = str2filter( ptr );
1313         op2->o_controls = NULL;
1314         op2->o_callback = NULL;
1315         so->s_op = op2;
1316
1317         /* Increment number of ops so that idletimeout ignores us */
1318         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1319         op->o_conn->c_n_ops_executing++;
1320         op->o_conn->c_n_ops_completed--;
1321         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1322 }
1323
1324 static int
1325 syncprov_search_response( Operation *op, SlapReply *rs )
1326 {
1327         searchstate *ss = op->o_callback->sc_private;
1328         slap_overinst *on = ss->ss_on;
1329         syncprov_info_t         *si = on->on_bi.bi_private;
1330         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1331
1332         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1333                 int i;
1334                 /* If we got a referral without a referral object, there's
1335                  * something missing that we cannot replicate. Just ignore it.
1336                  * The consumer will abort because we didn't send the expected
1337                  * control.
1338                  */
1339                 if ( !rs->sr_entry ) {
1340                         assert( rs->sr_entry );
1341                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1342                         return SLAP_CB_CONTINUE;
1343                 }
1344                 if ( srs->sr_state.ctxcsn ) {
1345                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1346                                 slap_schema.si_ad_entryCSN );
1347                         /* Don't send the ctx entry twice */
1348                         if ( bvmatch( &a->a_nvals[0], srs->sr_state.ctxcsn ))
1349                                 return LDAP_SUCCESS;
1350                 }
1351                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1352                         op->o_tmpmemctx );
1353                 rs->sr_ctrls[1] = NULL;
1354                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1355                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1356         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1357                 struct berval cookie;
1358
1359                 slap_compose_sync_cookie( op, &cookie,
1360                         &op->ors_filter->f_and->f_ava->aa_value,
1361                         srs->sr_state.sid, srs->sr_state.rid );
1362
1363                 /* Is this a regular refresh? */
1364                 if ( !ss->ss_so ) {
1365                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1366                                 op->o_tmpmemctx );
1367                         rs->sr_ctrls[1] = NULL;
1368                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1369                                 0, 1, &cookie, LDAP_SYNC_REFRESH_PRESENTS );
1370                 } else {
1371                         int locked = 0;
1372                 /* It's RefreshAndPersist, transition to Persist phase */
1373                         syncprov_sendinfo( op, rs, rs->sr_nentries ?
1374                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1375                                 &cookie, 1, NULL, 0 );
1376                         /* Flush any queued persist messages */
1377                         if ( ss->ss_so->s_res ) {
1378                                 syncres *sr, *srnext;
1379                                 Entry *e;
1380                                 opcookie opc;
1381
1382                                 opc.son = on;
1383                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1384                                 locked = 1;
1385                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1386                                         int rc = LDAP_SUCCESS;
1387                                         srnext = sr->s_next;
1388                                         opc.sdn = sr->s_dn;
1389                                         opc.sndn = sr->s_ndn;
1390                                         opc.suuid = sr->s_uuid;
1391                                         opc.sctxcsn = sr->s_csn;
1392                                         opc.sreference = sr->s_isreference;
1393                                         e = NULL;
1394
1395                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1396                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1397                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1398                                                 op->o_bd->bd_info = (BackendInfo *)on;
1399                                         }
1400                                         if ( rc == LDAP_SUCCESS )
1401                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1402                                                         sr->s_mode, 0 );
1403
1404                                         if ( e ) {
1405                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1406                                                 be_entry_release_r( op, e );
1407                                                 op->o_bd->bd_info = (BackendInfo *)on;
1408                                         }
1409                                         ch_free( sr );
1410                                 }
1411                                 ss->ss_so->s_res = NULL;
1412                                 ss->ss_so->s_restail = NULL;
1413                         }
1414
1415                         /* Turn off the refreshing flag */
1416                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1417                         if ( locked )
1418                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1419
1420                         /* Detach this Op from frontend control */
1421                         syncprov_detach_op( op, ss->ss_so );
1422
1423                         return LDAP_SUCCESS;
1424                 }
1425         }
1426
1427         return SLAP_CB_CONTINUE;
1428 }
1429
1430 static int
1431 syncprov_op_search( Operation *op, SlapReply *rs )
1432 {
1433         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1434         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1435         slap_callback   *cb;
1436         int gotstate = 0, nochange = 0;
1437         Filter *fand, *fava;
1438         syncops *sop = NULL;
1439         searchstate *ss;
1440         sync_control *srs;
1441
1442         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1443
1444         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1445                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1446                 return rs->sr_err;
1447         }
1448
1449         srs = op->o_controls[slap_cids.sc_LDAPsync];
1450
1451         /* If this is a persistent search, set it up right away */
1452         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1453                 syncops so = {0};
1454                 fbase_cookie fc;
1455                 opcookie opc;
1456                 slap_callback sc;
1457
1458                 fc.fss = &so;
1459                 fc.fbase = 0;
1460                 so.s_eid = NOID;
1461                 so.s_op = op;
1462                 so.s_flags = PS_IS_REFRESHING;
1463                 /* syncprov_findbase expects to be called as a callback... */
1464                 sc.sc_private = &opc;
1465                 opc.son = on;
1466                 cb = op->o_callback;
1467                 op->o_callback = &sc;
1468                 rs->sr_err = syncprov_findbase( op, &fc );
1469                 op->o_callback = cb;
1470
1471                 if ( rs->sr_err != LDAP_SUCCESS ) {
1472                         send_ldap_result( op, rs );
1473                         return rs->sr_err;
1474                 }
1475                 sop = ch_malloc( sizeof( syncops ));
1476                 *sop = so;
1477                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1478                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1479                 sop->s_sid = srs->sr_state.sid;
1480                 sop->s_rid = srs->sr_state.rid;
1481                 sop->s_next = si->si_ops;
1482                 sop->s_inuse = 1;
1483                 si->si_ops = sop;
1484                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1485         }
1486
1487         /* If we have a cookie, handle the PRESENT lookups
1488          */
1489         if ( srs->sr_state.ctxcsn ) {
1490                 /* Is the CSN in a valid format? */
1491                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
1492                         send_ldap_error( op, rs, LDAP_OTHER, "invalid sync cookie" );
1493                         return rs->sr_err;
1494                 }
1495                 /* Is the CSN still present in the database? */
1496                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1497                         /* No, so a reload is required */
1498 #if 0           /* the consumer doesn't seem to send this hint */
1499                         if ( op->o_sync_rhint == 0 ) {
1500                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1501                                 return rs->sr_err;
1502                         }
1503 #endif
1504                 } else {
1505                         gotstate = 1;
1506                         /* If just Refreshing and nothing has changed, shortcut it */
1507                         if ( bvmatch( srs->sr_state.ctxcsn, &si->si_ctxcsn )) {
1508                                 nochange = 1;
1509                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1510                                         LDAPControl     *ctrls[2];
1511
1512                                         ctrls[0] = NULL;
1513                                         ctrls[1] = NULL;
1514                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1515                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
1516                                         rs->sr_ctrls = ctrls;
1517                                         rs->sr_err = LDAP_SUCCESS;
1518                                         send_ldap_result( op, rs );
1519                                         rs->sr_ctrls = NULL;
1520                                         return rs->sr_err;
1521                                 }
1522                                 goto shortcut;
1523                         } else
1524                         /* If context has changed, check for Present UUIDs */
1525                         if ( syncprov_findcsn( op, FIND_PRESENT ) != LDAP_SUCCESS ) {
1526                                 send_ldap_result( op, rs );
1527                                 return rs->sr_err;
1528                         }
1529                 }
1530         }
1531
1532         /* Append CSN range to search filter, save original filter
1533          * for persistent search evaluation
1534          */
1535         if ( sop ) {
1536                 sop->s_filterstr= op->ors_filterstr;
1537         }
1538
1539         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1540         fand->f_choice = LDAP_FILTER_AND;
1541         fand->f_next = NULL;
1542         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1543         fava->f_choice = LDAP_FILTER_LE;
1544         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1545         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1546         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1547         ber_dupbv_x( &fava->f_ava->aa_value, &si->si_ctxcsn, op->o_tmpmemctx );
1548         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1549         fand->f_and = fava;
1550         if ( gotstate ) {
1551                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1552                 fava = fava->f_next;
1553                 fava->f_choice = LDAP_FILTER_GE;
1554                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1555                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1556                 ber_dupbv_x( &fava->f_ava->aa_value, srs->sr_state.ctxcsn, op->o_tmpmemctx );
1557         }
1558         fava->f_next = op->ors_filter;
1559         op->ors_filter = fand;
1560         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1561
1562 shortcut:
1563         /* Let our callback add needed info to returned entries */
1564         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1565         ss = (searchstate *)(cb+1);
1566         ss->ss_on = on;
1567         ss->ss_so = sop;
1568         cb->sc_response = syncprov_search_response;
1569         cb->sc_cleanup = syncprov_search_cleanup;
1570         cb->sc_private = ss;
1571         cb->sc_next = op->o_callback;
1572         op->o_callback = cb;
1573
1574 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1575         op->o_sync_mode &= SLAP_CONTROL_MASK;
1576 #endif
1577
1578         /* If this is a persistent search and no changes were reported during
1579          * the refresh phase, just invoke the response callback to transition
1580          * us into persist phase
1581          */
1582         if ( nochange ) {
1583                 rs->sr_err = LDAP_SUCCESS;
1584                 rs->sr_nentries = 0;
1585                 send_ldap_result( op, rs );
1586                 return rs->sr_err;
1587         }
1588         return SLAP_CB_CONTINUE;
1589 }
1590
1591 static int
1592 syncprov_operational(
1593         Operation *op,
1594         SlapReply *rs )
1595 {
1596         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1597         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1598
1599         if ( rs->sr_entry &&
1600                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1601
1602                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1603                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1604                         Attribute *a, **ap = NULL;
1605
1606                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1607                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1608                                         break;
1609                         }
1610
1611                         if ( !a ) {
1612                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1613
1614                                 a = ch_malloc( sizeof(Attribute));
1615                                 a->a_desc = slap_schema.si_ad_contextCSN;
1616                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1617                                 a->a_vals[1].bv_val = NULL;
1618                                 a->a_nvals = a->a_vals;
1619                                 a->a_next = NULL;
1620                                 a->a_flags = 0;
1621                                 *ap = a;
1622                         }
1623
1624                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1625                         if ( !ap ) {
1626                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1627                         } else {
1628                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1629                         }
1630                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1631                 }
1632         }
1633         return SLAP_CB_CONTINUE;
1634 }
1635
1636 static int
1637 syncprov_db_config(
1638         BackendDB       *be,
1639         const char      *fname,
1640         int             lineno,
1641         int             argc,
1642         char    **argv
1643 )
1644 {
1645         slap_overinst           *on = (slap_overinst *)be->bd_info;
1646         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1647
1648         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1649                 if ( argc != 3 ) {
1650                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1651                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1652                         return -1;
1653                 }
1654                 si->si_chkops = atoi( argv[1] );
1655                 si->si_chktime = atoi( argv[2] ) * 60;
1656                 return 0;
1657
1658         }
1659
1660         return SLAP_CONF_UNKNOWN;
1661 }
1662
1663 /* Cheating - we have no thread pool context for these functions,
1664  * so make one.
1665  */
1666 typedef struct thread_keys {
1667         void *key;
1668         void *data;
1669         ldap_pvt_thread_pool_keyfree_t *xfree;
1670 } thread_keys;
1671
1672 #define MAXKEYS 32
1673 /* A fake thread context */
1674 static thread_keys thrctx[MAXKEYS];
1675
1676 /* Read any existing contextCSN from the underlying db.
1677  * Then search for any entries newer than that. If no value exists,
1678  * just generate it. Cache whatever result.
1679  */
1680 static int
1681 syncprov_db_open(
1682     BackendDB *be
1683 )
1684 {
1685         slap_overinst   *on = (slap_overinst *) be->bd_info;
1686         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1687
1688         Connection conn;
1689         char opbuf[OPERATION_BUFFER_SIZE];
1690         Operation *op = (Operation *)opbuf;
1691         Entry *e;
1692         Attribute *a;
1693         int rc;
1694
1695         connection_fake_init( &conn, op, thrctx );
1696         op->o_bd = be;
1697         op->o_dn = be->be_rootdn;
1698         op->o_ndn = be->be_rootndn;
1699
1700         op->o_bd->bd_info = on->on_info->oi_orig;
1701         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
1702                 slap_schema.si_ad_contextCSN, 0, &e );
1703
1704         if ( e ) {
1705                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
1706                 if ( a ) {
1707                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
1708                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
1709                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
1710                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
1711                                 si->si_ctxcsn.bv_len );
1712                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
1713                 }
1714                 be_entry_release_r( op, e );
1715                 op->o_bd->bd_info = (BackendInfo *)on;
1716                 op->o_req_dn = be->be_suffix[0];
1717                 op->o_req_ndn = be->be_nsuffix[0];
1718                 op->ors_scope = LDAP_SCOPE_SUBTREE;
1719                 syncprov_findcsn( op, FIND_MAXCSN );
1720         }
1721
1722         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
1723                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
1724                                 &si->si_ctxcsn, 0 );
1725         }
1726
1727         op->o_bd->bd_info = (BackendInfo *)on;
1728         return 0;
1729 }
1730
1731 /* Write the current contextCSN into the underlying db.
1732  */
1733 static int
1734 syncprov_db_close(
1735     BackendDB *be
1736 )
1737 {
1738     slap_overinst   *on = (slap_overinst *) be->bd_info;
1739     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1740         int i;
1741
1742         if ( si->si_numops ) {
1743                 Connection conn;
1744                 char opbuf[OPERATION_BUFFER_SIZE];
1745                 Operation *op = (Operation *)opbuf;
1746                 SlapReply rs = {REP_RESULT};
1747
1748                 connection_fake_init( &conn, op, thrctx );
1749                 op->o_bd = be;
1750                 op->o_dn = be->be_rootdn;
1751                 op->o_ndn = be->be_rootndn;
1752                 syncprov_checkpoint( op, &rs, on );
1753         }
1754         for ( i=0; thrctx[i].key; i++) {
1755                 if ( thrctx[i].xfree )
1756                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
1757                 thrctx[i].key = NULL;
1758         }
1759
1760     return 0;
1761 }
1762
1763 static int
1764 syncprov_db_init(
1765         BackendDB *be
1766 )
1767 {
1768         slap_overinst   *on = (slap_overinst *)be->bd_info;
1769         syncprov_info_t *si;
1770
1771         si = ch_calloc(1, sizeof(syncprov_info_t));
1772         on->on_bi.bi_private = si;
1773         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
1774         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
1775         ldap_pvt_thread_rdwr_init( &si->si_mods_rwlock );
1776         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
1777
1778         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
1779         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
1780
1781         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
1782         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
1783
1784         return 0;
1785 }
1786
1787 static int
1788 syncprov_db_destroy(
1789         BackendDB *be
1790 )
1791 {
1792         slap_overinst   *on = (slap_overinst *)be->bd_info;
1793         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1794
1795         if ( si ) {
1796                 ldap_pvt_thread_rdwr_destroy( &si->si_mods_rwlock );
1797                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
1798                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
1799                 ch_free( si );
1800         }
1801
1802         return 0;
1803 }
1804
1805 static int syncprov_parseCtrl (
1806         Operation *op,
1807         SlapReply *rs,
1808         LDAPControl *ctrl )
1809 {
1810         ber_tag_t tag;
1811         BerElement *ber;
1812         ber_int_t mode;
1813         ber_len_t len;
1814         struct berval cookie = BER_BVNULL;
1815         sync_control *sr;
1816         int rhint = 0;
1817
1818         if ( op->o_sync != SLAP_CONTROL_NONE ) {
1819                 rs->sr_text = "Sync control specified multiple times";
1820                 return LDAP_PROTOCOL_ERROR;
1821         }
1822
1823         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
1824                 rs->sr_text = "Sync control specified with pagedResults control";
1825                 return LDAP_PROTOCOL_ERROR;
1826         }
1827
1828         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
1829                 rs->sr_text = "Sync control value is empty (or absent)";
1830                 return LDAP_PROTOCOL_ERROR;
1831         }
1832
1833         /* Parse the control value
1834          *      syncRequestValue ::= SEQUENCE {
1835          *              mode   ENUMERATED {
1836          *                      -- 0 unused
1837          *                      refreshOnly             (1),
1838          *                      -- 2 reserved
1839          *                      refreshAndPersist       (3)
1840          *              },
1841          *              cookie  syncCookie OPTIONAL
1842          *      }
1843          */
1844
1845         ber = ber_init( &ctrl->ldctl_value );
1846         if( ber == NULL ) {
1847                 rs->sr_text = "internal error";
1848                 return LDAP_OTHER;
1849         }
1850
1851         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
1852                 rs->sr_text = "Sync control : mode decoding error";
1853                 return LDAP_PROTOCOL_ERROR;
1854         }
1855
1856         switch( mode ) {
1857         case LDAP_SYNC_REFRESH_ONLY:
1858                 mode = SLAP_SYNC_REFRESH;
1859                 break;
1860         case LDAP_SYNC_REFRESH_AND_PERSIST:
1861                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
1862                 break;
1863         default:
1864                 rs->sr_text = "Sync control : unknown update mode";
1865                 return LDAP_PROTOCOL_ERROR;
1866         }
1867
1868         tag = ber_peek_tag( ber, &len );
1869
1870         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
1871                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
1872                         rs->sr_text = "Sync control : cookie decoding error";
1873                         return LDAP_PROTOCOL_ERROR;
1874                 }
1875         }
1876         if ( tag == LDAP_TAG_RELOAD_HINT ) {
1877                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
1878                         rs->sr_text = "Sync control : rhint decoding error";
1879                         return LDAP_PROTOCOL_ERROR;
1880                 }
1881         }
1882         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
1883                         rs->sr_text = "Sync control : decoding error";
1884                         return LDAP_PROTOCOL_ERROR;
1885         }
1886         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
1887         sr->sr_rhint = rhint;
1888         if (!BER_BVISNULL(&cookie)) {
1889                 ber_bvarray_add( &sr->sr_state.octet_str, &cookie );
1890                 slap_parse_sync_cookie( &sr->sr_state );
1891         }
1892
1893         op->o_controls[slap_cids.sc_LDAPsync] = sr;
1894
1895         (void) ber_free( ber, 1 );
1896
1897         op->o_sync = ctrl->ldctl_iscritical
1898                 ? SLAP_CONTROL_CRITICAL
1899                 : SLAP_CONTROL_NONCRITICAL;
1900
1901         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
1902
1903         return LDAP_SUCCESS;
1904 }
1905
1906 /* This overlay is set up for dynamic loading via moduleload. For static
1907  * configuration, you'll need to arrange for the slap_overinst to be
1908  * initialized and registered by some other function inside slapd.
1909  */
1910
1911 static slap_overinst            syncprov;
1912
1913 int
1914 syncprov_init()
1915 {
1916         int rc;
1917
1918         rc = register_supported_control( LDAP_CONTROL_SYNC,
1919                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
1920                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
1921         if ( rc != LDAP_SUCCESS ) {
1922                 fprintf( stderr, "Failed to register control %d\n", rc );
1923                 return rc;
1924         }
1925
1926         syncprov.on_bi.bi_type = "syncprov";
1927         syncprov.on_bi.bi_db_init = syncprov_db_init;
1928         syncprov.on_bi.bi_db_config = syncprov_db_config;
1929         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
1930         syncprov.on_bi.bi_db_open = syncprov_db_open;
1931         syncprov.on_bi.bi_db_close = syncprov_db_close;
1932
1933         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
1934         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
1935
1936         syncprov.on_bi.bi_op_add = syncprov_op_mod;
1937         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
1938         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
1939         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
1940         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
1941         syncprov.on_bi.bi_op_search = syncprov_op_search;
1942         syncprov.on_bi.bi_extended = syncprov_op_extended;
1943         syncprov.on_bi.bi_operational = syncprov_operational;
1944
1945         return overlay_register( &syncprov );
1946 }
1947
1948 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
1949 int
1950 init_module( int argc, char *argv[] )
1951 {
1952         return syncprov_init();
1953 }
1954 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
1955
1956 #endif /* defined(SLAPD_OVER_SYNCPROV) */