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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28
  29 /* A modify request on a particular entry */
  30 typedef struct modinst {
  31         struct modinst *mi_next;
  32         Operation *mi_op;
  33 } modinst;
  34
  35 typedef struct modtarget {
  36         struct modinst *mt_mods;
  37         struct modinst *mt_tail;
  38         Operation *mt_op;
  39         ldap_pvt_thread_mutex_t mt_mutex;
  40 } modtarget;
  41
  42 /* A queued result of a persistent search */
  43 typedef struct syncres {
  44         struct syncres *s_next;
  45         struct berval s_dn;
  46         struct berval s_ndn;
  47         struct berval s_uuid;
  48         struct berval s_csn;
  49         char s_mode;
  50         char s_isreference;
  51 } syncres;
  52
  53 /* Record of a persistent search */
  54 typedef struct syncops {
  55         struct syncops *s_next;
  56         struct berval   s_base;         /* ndn of search base */
  57         ID              s_eid;          /* entryID of search base */
  58         Operation       *s_op;          /* search op */
  59         int             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 #define PS_IS_DETACHED          0x02
  87
  88 /* Record of which searches matched at premodify step */
  89 typedef struct syncmatches {
  90         struct syncmatches *sm_next;
  91         syncops *sm_op;
  92 } syncmatches;
  93
  94 /* Session log data */
  95 typedef struct slog_entry {
  96         struct slog_entry *se_next;
  97         struct berval se_uuid;
  98         struct berval se_csn;
  99         ber_tag_t       se_tag;
 100 } slog_entry;
 101
 102 typedef struct sessionlog {
 103         struct berval   sl_mincsn;
 104         int             sl_num;
 105         int             sl_size;
 106         slog_entry *sl_head;
 107         slog_entry *sl_tail;
 108         ldap_pvt_thread_mutex_t sl_mutex;
 109 } sessionlog;
 110
 111 /* The main state for this overlay */
 112 typedef struct syncprov_info_t {
 113         syncops         *si_ops;
 114         struct berval   si_ctxcsn;      /* ldapsync context */
 115         int             si_chkops;      /* checkpointing info */
 116         int             si_chktime;
 117         int             si_numops;      /* number of ops since last checkpoint */
 118         time_t  si_chklast;     /* time of last checkpoint */
 119         Avlnode *si_mods;       /* entries being modified */
 120         sessionlog      *si_logs;
 121         ldap_pvt_thread_mutex_t si_csn_mutex;
 122         ldap_pvt_thread_mutex_t si_ops_mutex;
 123         ldap_pvt_thread_mutex_t si_mods_mutex;
 124         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 125 } syncprov_info_t;
 126
 127 typedef struct opcookie {
 128         slap_overinst *son;
 129         syncmatches *smatches;
 130         struct berval sdn;      /* DN of entry, for deletes */
 131         struct berval sndn;
 132         struct berval suuid;    /* UUID of entry */
 133         struct berval sctxcsn;
 134         int sreference; /* Is the entry a reference? */
 135 } opcookie;
 136
 137 typedef struct fbase_cookie {
 138         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 139         syncops *fss;   /* persistent search we're testing against */
 140         int fbase;      /* if TRUE we found the search base and it's still valid */
 141         int fscope;     /* if TRUE then fdn is within the psearch scope */
 142 } fbase_cookie;
 143
 144 static AttributeName csn_anlist[2];
 145 static AttributeName uuid_anlist[2];
 146
 147 /* Build a LDAPsync intermediate state control */
 148 static int
 149 syncprov_state_ctrl(
 150         Operation       *op,
 151         SlapReply       *rs,
 152         Entry           *e,
 153         int             entry_sync_state,
 154         LDAPControl     **ctrls,
 155         int             num_ctrls,
 156         int             send_cookie,
 157         struct berval   *cookie )
 158 {
 159         Attribute* a;
 160         int ret;
 161         int res;
 162         const char *text = NULL;
 163
 164         BerElementBuffer berbuf;
 165         BerElement *ber = (BerElement *)&berbuf;
 166
 167         struct berval   entryuuid_bv = BER_BVNULL;
 168
 169         ber_init2( ber, 0, LBER_USE_DER );
 170         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 171
 172         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 173
 174         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 175                 AttributeDescription *desc = a->a_desc;
 176                 if ( desc == slap_schema.si_ad_entryUUID ) {
 177                         entryuuid_bv = a->a_nvals[0];
 178                         break;
 179                 }
 180         }
 181
 182         if ( send_cookie && cookie ) {
 183                 ber_printf( ber, "{eOON}",
 184                         entry_sync_state, &entryuuid_bv, cookie );
 185         } else {
 186                 ber_printf( ber, "{eON}",
 187                         entry_sync_state, &entryuuid_bv );
 188         }
 189
 190         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 191         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 192         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 193
 194         ber_free_buf( ber );
 195
 196         if ( ret < 0 ) {
 197                 Debug( LDAP_DEBUG_TRACE,
 198                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 199                         0, 0, 0 );
 200                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 201                 return ret;
 202         }
 203
 204         return LDAP_SUCCESS;
 205 }
 206
 207 /* Build a LDAPsync final state control */
 208 static int
 209 syncprov_done_ctrl(
 210         Operation       *op,
 211         SlapReply       *rs,
 212         LDAPControl     **ctrls,
 213         int                     num_ctrls,
 214         int                     send_cookie,
 215         struct berval *cookie,
 216         int                     refreshDeletes )
 217 {
 218         int ret;
 219         BerElementBuffer berbuf;
 220         BerElement *ber = (BerElement *)&berbuf;
 221
 222         ber_init2( ber, NULL, LBER_USE_DER );
 223         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 224
 225         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 226
 227         ber_printf( ber, "{" );
 228         if ( send_cookie && cookie ) {
 229                 ber_printf( ber, "O", cookie );
 230         }
 231         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 232                 ber_printf( ber, "b", refreshDeletes );
 233         }
 234         ber_printf( ber, "N}" );
 235
 236         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 237         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 238         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 239
 240         ber_free_buf( ber );
 241
 242         if ( ret < 0 ) {
 243                 Debug( LDAP_DEBUG_TRACE,
 244                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 245                         0, 0, 0 );
 246                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 247                 return ret;
 248         }
 249
 250         return LDAP_SUCCESS;
 251 }
 252
 253 #if 0
 254 /* Generate state based on session log - not implemented yet */
 255 static int
 256 syncprov_state_ctrl_from_slog(
 257         Operation       *op,
 258         SlapReply       *rs,
 259         struct slog_entry *slog_e,
 260         int                     entry_sync_state,
 261         LDAPControl     **ctrls,
 262         int                     num_ctrls,
 263         int                     send_cookie,
 264         struct berval   *cookie)
 265 {
 266         Attribute* a;
 267         int ret;
 268         int res;
 269         const char *text = NULL;
 270
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273
 274         struct berval entryuuid_bv      = BER_BVNULL;
 275
 276         ber_init2( ber, NULL, LBER_USE_DER );
 277         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 278
 279         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 280
 281         entryuuid_bv = slog_e->sl_uuid;
 282
 283         if ( send_cookie && cookie ) {
 284                 ber_printf( ber, "{eOON}",
 285                         entry_sync_state, &entryuuid_bv, cookie );
 286         } else {
 287                 ber_printf( ber, "{eON}",
 288                         entry_sync_state, &entryuuid_bv );
 289         }
 290
 291         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 292         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 293         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 294
 295         ber_free_buf( ber );
 296
 297         if ( ret < 0 ) {
 298                 Debug( LDAP_DEBUG_TRACE,
 299                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 300                         0, 0, 0 );
 301                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 302                 return ret;
 303         }
 304
 305         return LDAP_SUCCESS;
 306 }
 307 #endif
 308
 309 static int
 310 syncprov_sendinfo(
 311         Operation       *op,
 312         SlapReply       *rs,
 313         int                     type,
 314         struct berval *cookie,
 315         int                     refreshDone,
 316         BerVarray       syncUUIDs,
 317         int                     refreshDeletes )
 318 {
 319         BerElementBuffer berbuf;
 320         BerElement *ber = (BerElement *)&berbuf;
 321         struct berval rspdata;
 322
 323         int ret;
 324
 325         ber_init2( ber, NULL, LBER_USE_DER );
 326         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 327
 328         if ( type ) {
 329                 switch ( type ) {
 330                 case LDAP_TAG_SYNC_NEW_COOKIE:
 331                         ber_printf( ber, "tO", type, cookie );
 332                         break;
 333                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 334                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 335                         ber_printf( ber, "t{", type );
 336                         if ( cookie ) {
 337                                 ber_printf( ber, "O", cookie );
 338                         }
 339                         if ( refreshDone == 0 ) {
 340                                 ber_printf( ber, "b", refreshDone );
 341                         }
 342                         ber_printf( ber, "N}" );
 343                         break;
 344                 case LDAP_TAG_SYNC_ID_SET:
 345                         ber_printf( ber, "t{", type );
 346                         if ( cookie ) {
 347                                 ber_printf( ber, "O", cookie );
 348                         }
 349                         if ( refreshDeletes == 1 ) {
 350                                 ber_printf( ber, "b", refreshDeletes );
 351                         }
 352                         ber_printf( ber, "[W]", syncUUIDs );
 353                         ber_printf( ber, "N}" );
 354                         break;
 355                 default:
 356                         Debug( LDAP_DEBUG_TRACE,
 357                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 358                                 type, 0, 0 );
 359                         return LDAP_OTHER;
 360                 }
 361         }
 362
 363         ret = ber_flatten2( ber, &rspdata, 0 );
 364
 365         if ( ret < 0 ) {
 366                 Debug( LDAP_DEBUG_TRACE,
 367                         "syncprov_sendinfo: ber_flatten2 failed\n",
 368                         0, 0, 0 );
 369                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 370                 return ret;
 371         }
 372
 373         rs->sr_rspoid = LDAP_SYNC_INFO;
 374         rs->sr_rspdata = &rspdata;
 375         send_ldap_intermediate( op, rs );
 376         rs->sr_rspdata = NULL;
 377         ber_free_buf( ber );
 378
 379         return LDAP_SUCCESS;
 380 }
 381
 382 /* Find a modtarget in an AVL tree */
 383 static int
 384 sp_avl_cmp( const void *c1, const void *c2 )
 385 {
 386         const modtarget *m1, *m2;
 387         int rc;
 388
 389         m1 = c1; m2 = c2;
 390         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 391
 392         if ( rc ) return rc;
 393         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 394 }
 395
 396 /* syncprov_findbase:
 397  *   finds the true DN of the base of a search (with alias dereferencing) and
 398  * checks to make sure the base entry doesn't get replaced with a different
 399  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 400  * change is detected, any persistent search on this base must be terminated /
 401  * reloaded.
 402  *   On the first call, we just save the DN and entryID. On subsequent calls
 403  * we compare the DN and entryID with the saved values.
 404  */
 405 static int
 406 findbase_cb( Operation *op, SlapReply *rs )
 407 {
 408         slap_callback *sc = op->o_callback;
 409
 410         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 411                 fbase_cookie *fc = sc->sc_private;
 412
 413                 /* If no entryID, we're looking for the first time.
 414                  * Just store whatever we got.
 415                  */
 416                 if ( fc->fss->s_eid == NOID ) {
 417                         fc->fbase = 1;
 418                         fc->fss->s_eid = rs->sr_entry->e_id;
 419                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 420
 421                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 422                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 423
 424                 /* OK, the DN is the same and the entryID is the same. Now
 425                  * see if the fdn resides in the scope.
 426                  */
 427                         fc->fbase = 1;
 428                         switch ( fc->fss->s_op->ors_scope ) {
 429                         case LDAP_SCOPE_BASE:
 430                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 431                                 break;
 432                         case LDAP_SCOPE_ONELEVEL: {
 433                                 struct berval pdn;
 434                                 dnParent( fc->fdn, &pdn );
 435                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 436                                 break; }
 437                         case LDAP_SCOPE_SUBTREE:
 438                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 439                                 break;
 440 #ifdef LDAP_SCOPE_SUBORDINATE
 441                         case LDAP_SCOPE_SUBORDINATE:
 442                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 443                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 444                                 break;
 445 #endif
 446                         }
 447                 }
 448         }
 449         if ( rs->sr_err != LDAP_SUCCESS ) {
 450                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 451         }
 452         return LDAP_SUCCESS;
 453 }
 454
 455 static int
 456 syncprov_findbase( Operation *op, fbase_cookie *fc )
 457 {
 458         opcookie *opc = op->o_callback->sc_private;
 459         slap_overinst *on = opc->son;
 460         syncprov_info_t         *si = on->on_bi.bi_private;
 461
 462         slap_callback cb = {0};
 463         Operation fop;
 464         SlapReply frs = { REP_RESULT };
 465         int rc;
 466
 467         fop = *op;
 468
 469         cb.sc_response = findbase_cb;
 470         cb.sc_private = fc;
 471
 472         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 473         fop.o_callback = &cb;
 474         fop.o_tag = LDAP_REQ_SEARCH;
 475         fop.ors_scope = LDAP_SCOPE_BASE;
 476         fop.ors_deref = fc->fss->s_op->ors_deref;
 477         fop.ors_limit = NULL;
 478         fop.ors_slimit = 1;
 479         fop.ors_tlimit = SLAP_NO_LIMIT;
 480         fop.ors_attrs = slap_anlist_no_attrs;
 481         fop.ors_attrsonly = 1;
 482         fop.ors_filter = fc->fss->s_op->ors_filter;
 483         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 484
 485         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 486
 487         fop.o_bd->bd_info = on->on_info->oi_orig;
 488         rc = fop.o_bd->be_search( &fop, &frs );
 489         fop.o_bd->bd_info = (BackendInfo *)on;
 490
 491         if ( fc->fbase ) return LDAP_SUCCESS;
 492
 493         /* If entryID has changed, then the base of this search has
 494          * changed. Invalidate the psearch.
 495          */
 496         return LDAP_NO_SUCH_OBJECT;
 497 }
 498
 499 /* syncprov_findcsn:
 500  *   This function has three different purposes, but they all use a search
 501  * that filters on entryCSN so they're combined here.
 502  * 1: at startup time, after a contextCSN has been read from the database,
 503  * we search for all entries with CSN >= contextCSN in case the contextCSN
 504  * was not checkpointed at the previous shutdown.
 505  *
 506  * 2: when the current contextCSN is known and we have a sync cookie, we search
 507  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 508  * entry is found, the cookie CSN is valid, otherwise it is stale.
 509  *
 510  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 511  * CSN, and generate Present records for them. We always collect this result
 512  * in SyncID sets, even if there's only one match.
 513  */
 514 #define FIND_MAXCSN     1
 515 #define FIND_CSN        2
 516 #define FIND_PRESENT    3
 517
 518 static int
 519 findmax_cb( Operation *op, SlapReply *rs )
 520 {
 521         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 522                 struct berval *maxcsn = op->o_callback->sc_private;
 523                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 524                         slap_schema.si_ad_entryCSN );
 525
 526                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 527                         maxcsn->bv_len = a->a_vals[0].bv_len;
 528                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 529                 }
 530         }
 531         return LDAP_SUCCESS;
 532 }
 533
 534 static int
 535 findcsn_cb( Operation *op, SlapReply *rs )
 536 {
 537         slap_callback *sc = op->o_callback;
 538
 539         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 540                 sc->sc_private = (void *)1;
 541         }
 542         return LDAP_SUCCESS;
 543 }
 544
 545 /* Build a list of entryUUIDs for sending in a SyncID set */
 546
 547 #define UUID_LEN        16
 548
 549 typedef struct fpres_cookie {
 550         int num;
 551         BerVarray uuids;
 552         char *last;
 553 } fpres_cookie;
 554
 555 static int
 556 findpres_cb( Operation *op, SlapReply *rs )
 557 {
 558         slap_callback *sc = op->o_callback;
 559         fpres_cookie *pc = sc->sc_private;
 560         Attribute *a;
 561         int ret = SLAP_CB_CONTINUE;
 562
 563         switch ( rs->sr_type ) {
 564         case REP_SEARCH:
 565                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 566                 if ( a ) {
 567                         pc->uuids[pc->num].bv_val = pc->last;
 568                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 569                                 pc->uuids[pc->num].bv_len );
 570                         pc->num++;
 571                         pc->last = pc->uuids[pc->num].bv_val;
 572                         pc->uuids[pc->num].bv_val = NULL;
 573                 }
 574                 ret = LDAP_SUCCESS;
 575                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 576                         break;
 577                 /* FALLTHRU */
 578         case REP_RESULT:
 579                 ret = rs->sr_err;
 580                 if ( pc->num ) {
 581                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 582                                 0, pc->uuids, 0 );
 583                         pc->uuids[pc->num].bv_val = pc->last;
 584                         pc->num = 0;
 585                         pc->last = pc->uuids[0].bv_val;
 586                 }
 587                 break;
 588         default:
 589                 break;
 590         }
 591         return ret;
 592 }
 593
 594 static int
 595 syncprov_findcsn( Operation *op, int mode )
 596 {
 597         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 598         syncprov_info_t         *si = on->on_bi.bi_private;
 599
 600         slap_callback cb = {0};
 601         Operation fop;
 602         SlapReply frs = { REP_RESULT };
 603         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 604         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 605         struct berval fbuf, maxcsn;
 606         Filter cf, af;
 607 #ifdef LDAP_COMP_MATCH
 608         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 609 #else
 610         AttributeAssertion eq = { NULL, BER_BVNULL };
 611 #endif
 612         int i, rc = LDAP_SUCCESS;
 613         fpres_cookie pcookie;
 614         sync_control *srs = NULL;
 615
 616         if ( mode != FIND_MAXCSN ) {
 617                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 618
 619                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 620                         return LDAP_OTHER;
 621                 }
 622         }
 623
 624         fop = *op;
 625         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 626
 627         fbuf.bv_val = buf;
 628         cf.f_ava = &eq;
 629         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 630         cf.f_next = NULL;
 631
 632         fop.o_callback = &cb;
 633         fop.ors_limit = NULL;
 634         fop.ors_tlimit = SLAP_NO_LIMIT;
 635         fop.ors_filter = &cf;
 636         fop.ors_filterstr = fbuf;
 637
 638         switch( mode ) {
 639         case FIND_MAXCSN:
 640                 cf.f_choice = LDAP_FILTER_GE;
 641                 cf.f_av_value = si->si_ctxcsn;
 642                 fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)",
 643                         cf.f_av_value.bv_val );
 644                 fop.ors_attrsonly = 0;
 645                 fop.ors_attrs = csn_anlist;
 646                 fop.ors_slimit = SLAP_NO_LIMIT;
 647                 cb.sc_private = &maxcsn;
 648                 cb.sc_response = findmax_cb;
 649                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 650                 maxcsn.bv_val = cbuf;
 651                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 652                 break;
 653         case FIND_CSN:
 654                 cf.f_choice = LDAP_FILTER_LE;
 655                 cf.f_av_value = srs->sr_state.ctxcsn;
 656                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 657                         cf.f_av_value.bv_val );
 658                 fop.ors_attrsonly = 1;
 659                 fop.ors_attrs = slap_anlist_no_attrs;
 660                 fop.ors_slimit = 1;
 661                 cb.sc_private = NULL;
 662                 cb.sc_response = findcsn_cb;
 663                 break;
 664         case FIND_PRESENT:
 665                 af.f_choice = LDAP_FILTER_AND;
 666                 af.f_next = NULL;
 667                 af.f_and = &cf;
 668                 cf.f_choice = LDAP_FILTER_LE;
 669                 cf.f_av_value = srs->sr_state.ctxcsn;
 670                 cf.f_next = op->ors_filter;
 671                 fop.ors_filter = &af;
 672                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 673                 fop.ors_attrsonly = 0;
 674                 fop.ors_attrs = uuid_anlist;
 675                 fop.ors_slimit = SLAP_NO_LIMIT;
 676                 /* We want pure entries, not referrals */
 677                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 678                 cb.sc_private = &pcookie;
 679                 cb.sc_response = findpres_cb;
 680                 pcookie.num = 0;
 681
 682                 /* preallocate storage for a full set */
 683                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 684                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 685                         op->o_tmpmemctx );
 686                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 687                 pcookie.uuids[0].bv_val = pcookie.last;
 688                 pcookie.uuids[0].bv_len = UUID_LEN;
 689                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 690                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 691                         pcookie.uuids[i].bv_len = UUID_LEN;
 692                 }
 693                 break;
 694         }
 695
 696         fop.o_bd->bd_info = on->on_info->oi_orig;
 697         fop.o_bd->be_search( &fop, &frs );
 698         fop.o_bd->bd_info = (BackendInfo *)on;
 699
 700         switch( mode ) {
 701         case FIND_MAXCSN:
 702                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 703                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 704                 break;
 705         case FIND_CSN:
 706                 /* If matching CSN was not found, invalidate the context. */
 707                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 708                 break;
 709         case FIND_PRESENT:
 710                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 711                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 712                 break;
 713         }
 714
 715         return rc;
 716 }
 717
 718 /* Queue a persistent search response if still in Refresh stage */
 719 static int
 720 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 721 {
 722         syncres *sr;
 723
 724         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 725                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 726         sr->s_next = NULL;
 727         sr->s_dn.bv_val = (char *)(sr + 1);
 728         sr->s_mode = mode;
 729         sr->s_isreference = opc->sreference;
 730         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 731         *(sr->s_ndn.bv_val++) = '\0';
 732         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 733         *(sr->s_uuid.bv_val++) = '\0';
 734         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 735
 736         if ( !so->s_res ) {
 737                 so->s_res = sr;
 738         } else {
 739                 so->s_restail->s_next = sr;
 740         }
 741         so->s_restail = sr;
 742         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 743         return LDAP_SUCCESS;
 744 }
 745
 746 /* Send a persistent search response */
 747 static int
 748 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 749 {
 750         slap_overinst *on = opc->son;
 751         syncprov_info_t *si = on->on_bi.bi_private;
 752
 753         SlapReply rs = { REP_SEARCH };
 754         LDAPControl *ctrls[2];
 755         struct berval cookie;
 756         Entry e_uuid = {0};
 757         Attribute a_uuid = {0};
 758         Operation sop = *so->s_op;
 759         Opheader ohdr;
 760
 761         ohdr = *sop.o_hdr;
 762         sop.o_hdr = &ohdr;
 763         sop.o_tmpmemctx = op->o_tmpmemctx;
 764         sop.o_bd = op->o_bd;
 765         sop.o_controls = op->o_controls;
 766
 767         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 768                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 769                 if ( so->s_flags & PS_IS_REFRESHING )
 770                         return syncprov_qresp( opc, so, mode );
 771                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 772         }
 773
 774         ctrls[1] = NULL;
 775         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 776
 777         e_uuid.e_attrs = &a_uuid;
 778         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 779         a_uuid.a_nvals = &opc->suuid;
 780         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 781                 mode, ctrls, 0, 1, &cookie );
 782
 783         rs.sr_entry = e;
 784         rs.sr_ctrls = ctrls;
 785         switch( mode ) {
 786         case LDAP_SYNC_ADD:
 787                 if ( opc->sreference ) {
 788                         rs.sr_ref = get_entry_referrals( &sop, e );
 789                         send_search_reference( &sop, &rs );
 790                         ber_bvarray_free( rs.sr_ref );
 791                         break;
 792                 }
 793                 /* fallthru */
 794         case LDAP_SYNC_MODIFY:
 795                 rs.sr_attrs = sop.ors_attrs;
 796                 send_search_entry( &sop, &rs );
 797                 break;
 798         case LDAP_SYNC_DELETE:
 799                 e_uuid.e_attrs = NULL;
 800                 e_uuid.e_name = opc->sdn;
 801                 e_uuid.e_nname = opc->sndn;
 802                 rs.sr_entry = &e_uuid;
 803                 if ( opc->sreference ) {
 804                         struct berval bv = BER_BVNULL;
 805                         rs.sr_ref = &bv;
 806                         send_search_reference( &sop, &rs );
 807                 } else {
 808                         send_search_entry( &sop, &rs );
 809                 }
 810                 break;
 811         default:
 812                 assert(0);
 813         }
 814         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 815         rs.sr_ctrls = NULL;
 816         return rs.sr_err;
 817 }
 818
 819 static void
 820 syncprov_free_syncop( syncops *so )
 821 {
 822         syncres *sr, *srnext;
 823         GroupAssertion *ga, *gnext;
 824
 825         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 826         so->s_inuse--;
 827         if ( so->s_inuse > 0 ) {
 828                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 829                 return;
 830         }
 831         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 832         if ( so->s_flags & PS_IS_DETACHED ) {
 833                 filter_free( so->s_op->ors_filter );
 834                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 835                         gnext = ga->ga_next;
 836                         ch_free( ga );
 837                 }
 838                 ch_free( so->s_op );
 839         }
 840         ch_free( so->s_base.bv_val );
 841         for ( sr=so->s_res; sr; sr=srnext ) {
 842                 srnext = sr->s_next;
 843                 ch_free( sr );
 844         }
 845         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 846         ch_free( so );
 847 }
 848
 849 static int
 850 syncprov_drop_psearch( syncops *so, int lock )
 851 {
 852         if ( so->s_flags & PS_IS_DETACHED ) {
 853                 if ( lock )
 854                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 855                 so->s_op->o_conn->c_n_ops_executing--;
 856                 so->s_op->o_conn->c_n_ops_completed++;
 857                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 858                         o_next );
 859                 if ( lock )
 860                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 861         }
 862         syncprov_free_syncop( so );
 863
 864         return 0;
 865 }
 866
 867 static int
 868 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 869 {
 870         slap_callback *sc = op->o_callback;
 871         op->o_callback = sc->sc_next;
 872         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 873         op->o_tmpfree( sc, op->o_tmpmemctx );
 874         return 0;
 875 }
 876
 877 static int
 878 syncprov_op_abandon( Operation *op, SlapReply *rs )
 879 {
 880         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 881         syncprov_info_t         *si = on->on_bi.bi_private;
 882         syncops *so, *soprev;
 883
 884         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 885         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 886                 soprev=so, so=so->s_next ) {
 887                 if ( so->s_op->o_connid == op->o_connid &&
 888                         so->s_op->o_msgid == op->orn_msgid ) {
 889                                 so->s_op->o_abandon = 1;
 890                                 soprev->s_next = so->s_next;
 891                                 break;
 892                 }
 893         }
 894         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 895         if ( so ) {
 896                 /* Is this really a Cancel exop? */
 897                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 898                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 899                         rs->sr_err = LDAP_CANCELLED;
 900                         send_ldap_result( so->s_op, rs );
 901                         if ( so->s_flags & PS_IS_DETACHED ) {
 902                                 slap_callback *cb;
 903                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 904                                 cb->sc_cleanup = syncprov_ab_cleanup;
 905                                 cb->sc_next = op->o_callback;
 906                                 cb->sc_private = so;
 907                                 return SLAP_CB_CONTINUE;
 908                         }
 909                 }
 910                 syncprov_drop_psearch( so, 0 );
 911         }
 912         return SLAP_CB_CONTINUE;
 913 }
 914
 915 /* Find which persistent searches are affected by this operation */
 916 static void
 917 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 918 {
 919         slap_overinst *on = opc->son;
 920         syncprov_info_t         *si = on->on_bi.bi_private;
 921
 922         fbase_cookie fc;
 923         syncops *ss, *sprev, *snext;
 924         Entry *e;
 925         Attribute *a;
 926         int rc;
 927         struct berval newdn;
 928         int freefdn = 0;
 929
 930         fc.fdn = &op->o_req_ndn;
 931         /* compute new DN */
 932         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 933                 struct berval pdn;
 934                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 935                 else dnParent( fc.fdn, &pdn );
 936                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 937                 fc.fdn = &newdn;
 938                 freefdn = 1;
 939         }
 940         if ( op->o_tag != LDAP_REQ_ADD ) {
 941                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 942                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 943                 op->o_bd->bd_info = (BackendInfo *)on;
 944                 if ( rc ) return;
 945         } else {
 946                 e = op->ora_e;
 947         }
 948
 949         if ( saveit ) {
 950                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 951                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 952                 opc->sreference = is_entry_referral( e );
 953         }
 954         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 955                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 956                 if ( a )
 957                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 958         }
 959
 960         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 961         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 962                 sprev = ss, ss=snext)
 963         {
 964                 syncmatches *sm;
 965                 int found = 0;
 966
 967                 snext = ss->s_next;
 968                 /* validate base */
 969                 fc.fss = ss;
 970                 fc.fbase = 0;
 971                 fc.fscope = 0;
 972
 973                 /* If the base of the search is missing, signal a refresh */
 974                 rc = syncprov_findbase( op, &fc );
 975                 if ( rc != LDAP_SUCCESS ) {
 976                         SlapReply rs = {REP_RESULT};
 977                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 978                                 "search base has changed" );
 979                         sprev->s_next = snext;
 980                         syncprov_drop_psearch( ss, 1 );
 981                         continue;
 982                 }
 983
 984                 /* If we're sending results now, look for this op in old matches */
 985                 if ( !saveit ) {
 986                         syncmatches *old;
 987                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 988                                 old=sm, sm=sm->sm_next ) {
 989                                 if ( sm->sm_op == ss ) {
 990                                         found = 1;
 991                                         old->sm_next = sm->sm_next;
 992                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 993                                         break;
 994                                 }
 995                         }
 996                 }
 997
 998                 /* check if current o_req_dn is in scope and matches filter */
 999                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1000                         LDAP_COMPARE_TRUE ) {
1001                         if ( saveit ) {
1002                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1003                                 sm->sm_next = opc->smatches;
1004                                 sm->sm_op = ss;
1005                                 ss->s_inuse++;
1006                                 opc->smatches = sm;
1007                         } else {
1008                                 /* if found send UPDATE else send ADD */
1009                                 syncprov_sendresp( op, opc, ss, e,
1010                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1011                         }
1012                 } else if ( !saveit && found ) {
1013                         /* send DELETE */
1014                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1015                 }
1016         }
1017         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1018 done:
1019         if ( op->o_tag != LDAP_REQ_ADD ) {
1020                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1021                 be_entry_release_rw( op, e, 0 );
1022                 op->o_bd->bd_info = (BackendInfo *)on;
1023         }
1024         if ( freefdn ) {
1025                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1026         }
1027 }
1028
1029 static int
1030 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1031 {
1032         slap_callback *cb = op->o_callback;
1033         opcookie *opc = cb->sc_private;
1034         slap_overinst *on = opc->son;
1035         syncprov_info_t         *si = on->on_bi.bi_private;
1036         syncmatches *sm, *snext;
1037         modtarget *mt, mtdummy;
1038
1039         for (sm = opc->smatches; sm; sm=snext) {
1040                 snext = sm->sm_next;
1041                 syncprov_free_syncop( sm->sm_op );
1042                 op->o_tmpfree( sm, op->o_tmpmemctx );
1043         }
1044
1045         /* Remove op from lock table */
1046         mtdummy.mt_op = op;
1047         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1048         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1049         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1050         if ( mt ) {
1051                 modinst *mi = mt->mt_mods;
1052
1053                 /* If there are more, promote the next one */
1054                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1055                 if ( mi->mi_next ) {
1056                         mt->mt_mods = mi->mi_next;
1057                         mt->mt_op = mt->mt_mods->mi_op;
1058                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1059                 } else {
1060                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1061                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1062                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1063                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1064                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1065                         ch_free( mt );
1066                 }
1067         }
1068         if ( !BER_BVISNULL( &opc->suuid ))
1069                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1070         if ( !BER_BVISNULL( &opc->sndn ))
1071                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1072         if ( !BER_BVISNULL( &opc->sdn ))
1073                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1074         op->o_callback = cb->sc_next;
1075         op->o_tmpfree(cb, op->o_tmpmemctx);
1076
1077         return 0;
1078 }
1079
1080 static void
1081 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1082 {
1083         syncprov_info_t         *si = on->on_bi.bi_private;
1084         Modifications mod;
1085         Operation opm;
1086         struct berval bv[2];
1087         BackendInfo *orig;
1088         slap_callback cb = {0};
1089
1090         mod.sml_values = bv;
1091         bv[1].bv_val = NULL;
1092         bv[0] = si->si_ctxcsn;
1093         mod.sml_nvalues = NULL;
1094         mod.sml_desc = slap_schema.si_ad_contextCSN;
1095         mod.sml_op = LDAP_MOD_REPLACE;
1096         mod.sml_next = NULL;
1097
1098         cb.sc_response = slap_null_cb;
1099         opm = *op;
1100         opm.o_tag = LDAP_REQ_MODIFY;
1101         opm.o_callback = &cb;
1102         opm.orm_modlist = &mod;
1103         opm.o_req_dn = op->o_bd->be_suffix[0];
1104         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1105         orig = opm.o_bd->bd_info;
1106         opm.o_bd->bd_info = on->on_info->oi_orig;
1107         opm.o_bd->be_modify( &opm, rs );
1108 }
1109
1110 static void
1111 syncprov_add_slog( Operation *op, struct berval *csn )
1112 {
1113         opcookie *opc = op->o_callback->sc_private;
1114         slap_overinst *on = opc->son;
1115         syncprov_info_t         *si = on->on_bi.bi_private;
1116         sessionlog *sl;
1117         slog_entry *se;
1118
1119         sl = si->si_logs;
1120         {
1121                 /* Allocate a record. UUIDs are not NUL-terminated. */
1122                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1123                         csn->bv_len + 1 );
1124                 se->se_next = NULL;
1125                 se->se_tag = op->o_tag;
1126
1127                 se->se_uuid.bv_val = (char *)(se+1);
1128                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len + 1;
1129                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1130                 se->se_uuid.bv_len = opc->suuid.bv_len;
1131
1132                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1133                 se->se_csn.bv_val[csn->bv_len] = '\0';
1134                 se->se_csn.bv_len = csn->bv_len;
1135
1136                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1137                 if ( sl->sl_head ) {
1138                         sl->sl_tail->se_next = se;
1139                 } else {
1140                         sl->sl_head = se;
1141                 }
1142                 sl->sl_tail = se;
1143                 sl->sl_num++;
1144                 while ( sl->sl_num > sl->sl_size ) {
1145                         se = sl->sl_head;
1146                         sl->sl_head = se->se_next;
1147                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1148                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1149                         ch_free( se );
1150                         sl->sl_num--;
1151                         if ( !sl->sl_head ) {
1152                                 sl->sl_tail = NULL;
1153                         }
1154                 }
1155                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1156         }
1157 }
1158
1159 /* Just set a flag if we found the matching entry */
1160 static int
1161 playlog_cb( Operation *op, SlapReply *rs )
1162 {
1163         if ( rs->sr_type == REP_SEARCH ) {
1164                 op->o_callback->sc_private = (void *)1;
1165         }
1166         return rs->sr_err;
1167 }
1168
1169 /* enter with sl->sl_mutex locked, release before returning */
1170 static void
1171 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1172         struct berval *oldcsn, struct berval *ctxcsn )
1173 {
1174         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1175         syncprov_info_t         *si = on->on_bi.bi_private;
1176         slog_entry *se;
1177         int i, j, ndel, num, nmods, mmods;
1178         BerVarray uuids;
1179
1180         if ( !sl->sl_num ) {
1181                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1182                 return;
1183         }
1184
1185         num = sl->sl_num;
1186         i = 0;
1187         nmods = 0;
1188
1189         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1190                 num * UUID_LEN, op->o_tmpmemctx );
1191
1192         uuids[0].bv_val = (char *)(uuids + num + 1);
1193
1194         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1195          * and everything else at the end. Do this first so we can
1196          * unlock the list mutex.
1197          */
1198         for ( se=sl->sl_head; se; se=se->se_next ) {
1199                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1200                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1201                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1202                         j = i;
1203                         i++;
1204                 } else {
1205                         nmods++;
1206                         j = num - nmods;
1207                 }
1208                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1209                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1210                 uuids[j].bv_len = UUID_LEN;
1211         }
1212         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1213
1214         ndel = i;
1215
1216         /* Zero out unused slots */
1217         for ( i=ndel; i < num - nmods; i++ )
1218                 uuids[i].bv_len = 0;
1219
1220         /* Mods must be validated to see if they belong in this delete set.
1221          */
1222
1223         mmods = nmods;
1224         /* Strip any duplicates */
1225         for ( i=0; i<nmods; i++ ) {
1226                 for ( j=0; j<ndel; j++ ) {
1227                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1228                                 uuids[num - 1 - i].bv_len = 0;
1229                                 mmods --;
1230                                 break;
1231                         }
1232                 }
1233                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1234                 for ( j=0; j<i; j++ ) {
1235                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1236                                 uuids[num - 1 - i].bv_len = 0;
1237                                 mmods --;
1238                                 break;
1239                         }
1240                 }
1241         }
1242
1243         if ( mmods ) {
1244                 Operation fop;
1245                 SlapReply frs = { REP_RESULT };
1246                 int rc;
1247                 Filter mf, af;
1248 #ifdef LDAP_COMP_MATCH
1249                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1250 #else
1251                 AttributeAssertion eq;
1252 #endif
1253                 slap_callback cb = {0};
1254
1255                 fop = *op;
1256
1257                 fop.o_sync_mode = 0;
1258                 fop.o_callback = &cb;
1259                 fop.ors_limit = NULL;
1260                 fop.ors_tlimit = SLAP_NO_LIMIT;
1261                 fop.ors_attrs = slap_anlist_all_attributes;
1262                 fop.ors_attrsonly = 0;
1263                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1264
1265                 af.f_choice = LDAP_FILTER_AND;
1266                 af.f_next = NULL;
1267                 af.f_and = &mf;
1268                 mf.f_choice = LDAP_FILTER_EQUALITY;
1269                 mf.f_ava = &eq;
1270                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1271                 mf.f_next = fop.ors_filter;
1272
1273                 fop.ors_filter = &af;
1274
1275                 cb.sc_response = playlog_cb;
1276                 fop.o_bd->bd_info = on->on_info->oi_orig;
1277
1278                 for ( i=ndel; i<num; i++ ) {
1279                         if ( uuids[i].bv_len == 0 ) continue;
1280
1281                         mf.f_av_value = uuids[i];
1282                         cb.sc_private = NULL;
1283                         fop.ors_slimit = 1;
1284                         rc = fop.o_bd->be_search( &fop, &frs );
1285
1286                         /* If entry was not found, add to delete list */
1287                         if ( !cb.sc_private ) {
1288                                 uuids[ndel++] = uuids[i];
1289                         }
1290                 }
1291                 fop.o_bd->bd_info = (BackendInfo *)on;
1292         }
1293         if ( ndel ) {
1294                 uuids[ndel].bv_val = NULL;
1295                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1296         }
1297 }
1298
1299 static int
1300 syncprov_op_response( Operation *op, SlapReply *rs )
1301 {
1302         opcookie *opc = op->o_callback->sc_private;
1303         slap_overinst *on = opc->son;
1304         syncprov_info_t         *si = on->on_bi.bi_private;
1305         syncmatches *sm;
1306
1307         if ( rs->sr_err == LDAP_SUCCESS )
1308         {
1309                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1310                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1311
1312                 /* Update our context CSN */
1313                 cbuf[0] = '\0';
1314                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1315                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1316                 if ( !BER_BVISNULL( &maxcsn ) ) {
1317                         strcpy( cbuf, maxcsn.bv_val );
1318                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1319                                 strcpy( si->si_ctxcsnbuf, cbuf );
1320                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1321                         }
1322                 }
1323
1324                 /* Don't do any processing for consumer contextCSN updates */
1325                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1326                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1327                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1328                         return SLAP_CB_CONTINUE;
1329                 }
1330
1331                 si->si_numops++;
1332                 if ( si->si_chkops || si->si_chktime ) {
1333                         int do_check=0;
1334                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1335                                 do_check = 1;
1336                                 si->si_numops = 0;
1337                         }
1338                         if ( si->si_chktime &&
1339                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1340                                 do_check = 1;
1341                                 si->si_chklast = op->o_time;
1342                         }
1343                         if ( do_check ) {
1344                                 syncprov_checkpoint( op, rs, on );
1345                         }
1346                 }
1347                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1348
1349                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1350                 opc->sctxcsn.bv_val = cbuf;
1351
1352                 /* Handle any persistent searches */
1353                 if ( si->si_ops ) {
1354                         switch(op->o_tag) {
1355                         case LDAP_REQ_ADD:
1356                         case LDAP_REQ_MODIFY:
1357                         case LDAP_REQ_MODRDN:
1358                         case LDAP_REQ_EXTENDED:
1359                                 syncprov_matchops( op, opc, 0 );
1360                                 break;
1361                         case LDAP_REQ_DELETE:
1362                                 /* for each match in opc->smatches:
1363                                  *   send DELETE msg
1364                                  */
1365                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1366                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1367                                         if ( sm->sm_op->s_op->o_abandon )
1368                                                 continue;
1369                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1370                                                 LDAP_SYNC_DELETE, 1 );
1371                                 }
1372                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1373                                 break;
1374                         }
1375                 }
1376
1377                 /* Add any log records */
1378                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1379                         syncprov_add_slog( op, &curcsn );
1380                 }
1381
1382         }
1383         return SLAP_CB_CONTINUE;
1384 }
1385
1386 /* We don't use a subentry to store the context CSN any more.
1387  * We expose the current context CSN as an operational attribute
1388  * of the suffix entry.
1389  */
1390 static int
1391 syncprov_op_compare( Operation *op, SlapReply *rs )
1392 {
1393         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1394         syncprov_info_t         *si = on->on_bi.bi_private;
1395         int rc = SLAP_CB_CONTINUE;
1396
1397         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1398                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1399         {
1400                 Entry e = {0};
1401                 Attribute a = {0};
1402                 struct berval bv[2];
1403
1404                 e.e_name = op->o_bd->be_suffix[0];
1405                 e.e_nname = op->o_bd->be_nsuffix[0];
1406
1407                 BER_BVZERO( &bv[1] );
1408                 bv[0] = si->si_ctxcsn;
1409
1410                 a.a_desc = slap_schema.si_ad_contextCSN;
1411                 a.a_vals = bv;
1412                 a.a_nvals = a.a_vals;
1413
1414                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1415
1416                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1417                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1418                 if ( ! rs->sr_err ) {
1419                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1420                         goto return_results;
1421                 }
1422
1423                 if ( get_assert( op ) &&
1424                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1425                 {
1426                         rs->sr_err = LDAP_ASSERTION_FAILED;
1427                         goto return_results;
1428                 }
1429
1430
1431                 rs->sr_err = LDAP_COMPARE_FALSE;
1432
1433                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1434                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1435                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1436                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1437                 {
1438                         rs->sr_err = LDAP_COMPARE_TRUE;
1439                 }
1440
1441 return_results:;
1442
1443                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1444
1445                 send_ldap_result( op, rs );
1446
1447                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1448                         rs->sr_err = LDAP_SUCCESS;
1449                 }
1450                 rc = rs->sr_err;
1451         }
1452
1453         return rc;
1454 }
1455
1456 static int
1457 syncprov_op_mod( Operation *op, SlapReply *rs )
1458 {
1459         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1460         syncprov_info_t         *si = on->on_bi.bi_private;
1461
1462         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1463                 sizeof(opcookie) +
1464                 (si->si_ops ? sizeof(modinst) : 0 ),
1465                 op->o_tmpmemctx);
1466         opcookie *opc = (opcookie *)(cb+1);
1467         opc->son = on;
1468         cb->sc_response = syncprov_op_response;
1469         cb->sc_cleanup = syncprov_op_cleanup;
1470         cb->sc_private = opc;
1471         cb->sc_next = op->o_callback;
1472         op->o_callback = cb;
1473
1474         /* If there are active persistent searches, lock this operation.
1475          * See seqmod.c for the locking logic on its own.
1476          */
1477         if ( si->si_ops ) {
1478                 modtarget *mt, mtdummy;
1479                 modinst *mi;
1480
1481                 mi = (modinst *)(opc+1);
1482                 mi->mi_op = op;
1483
1484                 /* See if we're already modifying this entry... */
1485                 mtdummy.mt_op = op;
1486                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1487                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1488                 if ( mt ) {
1489                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1490                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1491                         mt->mt_tail->mi_next = mi;
1492                         mt->mt_tail = mi;
1493                         /* wait for this op to get to head of list */
1494                         while ( mt->mt_mods != mi ) {
1495                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1496                                 ldap_pvt_thread_yield();
1497                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1498
1499                                 /* clean up if the caller is giving up */
1500                                 if ( op->o_abandon ) {
1501                                         modinst *m2;
1502                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1503                                                 m2 = m2->mi_next );
1504                                         m2->mi_next = mi->mi_next;
1505                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1506                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1507                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1508                                         return SLAPD_ABANDON;
1509                                 }
1510                         }
1511                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1512                 } else {
1513                         /* Record that we're modifying this entry now */
1514                         mt = ch_malloc( sizeof(modtarget) );
1515                         mt->mt_mods = mi;
1516                         mt->mt_tail = mi;
1517                         mt->mt_op = mi->mi_op;
1518                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1519                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1520                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1521                 }
1522         }
1523
1524         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1525                 syncprov_matchops( op, opc, 1 );
1526
1527
1528         return SLAP_CB_CONTINUE;
1529 }
1530
1531 static int
1532 syncprov_op_extended( Operation *op, SlapReply *rs )
1533 {
1534         if ( exop_is_write( op ))
1535                 return syncprov_op_mod( op, rs );
1536
1537         return SLAP_CB_CONTINUE;
1538 }
1539
1540 typedef struct searchstate {
1541         slap_overinst *ss_on;
1542         syncops *ss_so;
1543         int ss_present;
1544 } searchstate;
1545
1546 static int
1547 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1548 {
1549         if ( rs->sr_ctrls ) {
1550                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1551                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1552                 rs->sr_ctrls = NULL;
1553         }
1554         return 0;
1555 }
1556
1557 static void
1558 syncprov_detach_op( Operation *op, syncops *so )
1559 {
1560         Operation *op2;
1561         int i, alen = 0;
1562         size_t size;
1563         char *ptr;
1564         GroupAssertion *g1, *g2;
1565
1566         /* count the search attrs */
1567         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1568                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1569         }
1570         /* Make a new copy of the operation */
1571         size = sizeof(Operation) + sizeof(Opheader) +
1572                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1573                 op->o_req_dn.bv_len + 1 +
1574                 op->o_req_ndn.bv_len + 1 +
1575                 op->o_ndn.bv_len + 1 +
1576                 so->s_filterstr.bv_len + 1;
1577         op2 = (Operation *)ch_calloc( 1, size );
1578         op2->o_hdr = (Opheader *)(op2+1);
1579
1580         /* Copy the fields we care about explicitly, leave the rest alone */
1581         *op2->o_hdr = *op->o_hdr;
1582         op2->o_tag = op->o_tag;
1583         op2->o_time = op->o_time;
1584         op2->o_bd = op->o_bd;
1585         op2->o_request = op->o_request;
1586
1587         if ( i ) {
1588                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1589                 ptr = (char *)(op2->ors_attrs+i+1);
1590                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1591                         op2->ors_attrs[i] = op->ors_attrs[i];
1592                         op2->ors_attrs[i].an_name.bv_val = ptr;
1593                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1594                 }
1595                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1596         } else {
1597                 ptr = (char *)(op2->o_hdr + 1);
1598         }
1599         op2->o_authz = op->o_authz;
1600         op2->o_ndn.bv_val = ptr;
1601         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1602         op2->o_dn = op2->o_ndn;
1603         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1604         op2->o_req_dn.bv_val = ptr;
1605         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1606         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1607         op2->o_req_ndn.bv_val = ptr;
1608         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1609         op2->ors_filterstr.bv_val = ptr;
1610         strcpy( ptr, so->s_filterstr.bv_val );
1611         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1612         op2->ors_filter = str2filter( ptr );
1613         so->s_op = op2;
1614
1615         /* Copy any cached group ACLs individually */
1616         op2->o_groups = NULL;
1617         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1618                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1619                 *g2 = *g1;
1620                 strcpy( g2->ga_ndn, g1->ga_ndn );
1621                 g2->ga_next = op2->o_groups;
1622                 op2->o_groups = g2;
1623         }
1624
1625         /* Add op2 to conn so abandon will find us */
1626         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1627         op->o_conn->c_n_ops_executing++;
1628         op->o_conn->c_n_ops_completed--;
1629         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1630         so->s_flags |= PS_IS_DETACHED;
1631         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1632 }
1633
1634 static int
1635 syncprov_search_response( Operation *op, SlapReply *rs )
1636 {
1637         searchstate *ss = op->o_callback->sc_private;
1638         slap_overinst *on = ss->ss_on;
1639         syncprov_info_t         *si = on->on_bi.bi_private;
1640         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1641
1642         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1643                 int i;
1644                 /* If we got a referral without a referral object, there's
1645                  * something missing that we cannot replicate. Just ignore it.
1646                  * The consumer will abort because we didn't send the expected
1647                  * control.
1648                  */
1649                 if ( !rs->sr_entry ) {
1650                         assert( rs->sr_entry );
1651                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1652                         return SLAP_CB_CONTINUE;
1653                 }
1654                 if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1655                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1656                                 slap_schema.si_ad_entryCSN );
1657
1658                         /* Don't send the ctx entry twice */
1659                         if ( a && bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1660                                 return LDAP_SUCCESS;
1661                 }
1662                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1663                         op->o_tmpmemctx );
1664                 rs->sr_ctrls[1] = NULL;
1665                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1666                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1667         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1668                 struct berval cookie;
1669
1670                 slap_compose_sync_cookie( op, &cookie,
1671                         &op->ors_filter->f_and->f_ava->aa_value,
1672                         srs->sr_state.rid );
1673
1674                 /* Is this a regular refresh? */
1675                 if ( !ss->ss_so ) {
1676                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1677                                 op->o_tmpmemctx );
1678                         rs->sr_ctrls[1] = NULL;
1679                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1680                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1681                                         LDAP_SYNC_REFRESH_DELETES );
1682                 } else {
1683                         int locked = 0;
1684                 /* It's RefreshAndPersist, transition to Persist phase */
1685                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1686                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1687                                 &cookie, 1, NULL, 0 );
1688                         /* Flush any queued persist messages */
1689                         if ( ss->ss_so->s_res ) {
1690                                 syncres *sr, *srnext;
1691                                 Entry *e;
1692                                 opcookie opc;
1693
1694                                 opc.son = on;
1695                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1696                                 locked = 1;
1697                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1698                                         int rc = LDAP_SUCCESS;
1699                                         srnext = sr->s_next;
1700                                         opc.sdn = sr->s_dn;
1701                                         opc.sndn = sr->s_ndn;
1702                                         opc.suuid = sr->s_uuid;
1703                                         opc.sctxcsn = sr->s_csn;
1704                                         opc.sreference = sr->s_isreference;
1705                                         e = NULL;
1706
1707                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1708                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1709                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1710                                                 op->o_bd->bd_info = (BackendInfo *)on;
1711                                         }
1712                                         if ( rc == LDAP_SUCCESS )
1713                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1714                                                         sr->s_mode, 0 );
1715
1716                                         if ( e ) {
1717                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1718                                                 be_entry_release_rw( op, e, 0 );
1719                                                 op->o_bd->bd_info = (BackendInfo *)on;
1720                                         }
1721                                         ch_free( sr );
1722                                 }
1723                                 ss->ss_so->s_res = NULL;
1724                                 ss->ss_so->s_restail = NULL;
1725                         }
1726
1727                         /* Turn off the refreshing flag */
1728                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1729                         if ( locked )
1730                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1731
1732                         /* Detach this Op from frontend control */
1733                         syncprov_detach_op( op, ss->ss_so );
1734
1735                         return LDAP_SUCCESS;
1736                 }
1737         }
1738
1739         return SLAP_CB_CONTINUE;
1740 }
1741
1742 static int
1743 syncprov_op_search( Operation *op, SlapReply *rs )
1744 {
1745         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1746         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1747         slap_callback   *cb;
1748         int gotstate = 0, nochange = 0, do_present = 1;
1749         Filter *fand, *fava;
1750         syncops *sop = NULL;
1751         searchstate *ss;
1752         sync_control *srs;
1753         struct berval ctxcsn;
1754         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1755
1756         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1757
1758         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1759                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1760                 return rs->sr_err;
1761         }
1762
1763         srs = op->o_controls[slap_cids.sc_LDAPsync];
1764
1765         /* If this is a persistent search, set it up right away */
1766         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1767                 syncops so = {0};
1768                 fbase_cookie fc;
1769                 opcookie opc;
1770                 slap_callback sc;
1771
1772                 fc.fss = &so;
1773                 fc.fbase = 0;
1774                 so.s_eid = NOID;
1775                 so.s_op = op;
1776                 so.s_flags = PS_IS_REFRESHING;
1777                 /* syncprov_findbase expects to be called as a callback... */
1778                 sc.sc_private = &opc;
1779                 opc.son = on;
1780                 cb = op->o_callback;
1781                 op->o_callback = &sc;
1782                 rs->sr_err = syncprov_findbase( op, &fc );
1783                 op->o_callback = cb;
1784
1785                 if ( rs->sr_err != LDAP_SUCCESS ) {
1786                         send_ldap_result( op, rs );
1787                         return rs->sr_err;
1788                 }
1789                 sop = ch_malloc( sizeof( syncops ));
1790                 *sop = so;
1791                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1792                 sop->s_rid = srs->sr_state.rid;
1793                 sop->s_inuse = 1;
1794
1795                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1796                 sop->s_next = si->si_ops;
1797                 si->si_ops = sop;
1798                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1799         }
1800
1801         /* snapshot the ctxcsn */
1802         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1803         strcpy( csnbuf, si->si_ctxcsnbuf );
1804         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1805         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1806         ctxcsn.bv_val = csnbuf;
1807
1808         /* If we have a cookie, handle the PRESENT lookups */
1809         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1810                 sessionlog *sl;
1811
1812                 /* The cookie was validated when it was parsed, just use it */
1813
1814                 /* If just Refreshing and nothing has changed, shortcut it */
1815                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1816                         nochange = 1;
1817                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1818                                 LDAPControl     *ctrls[2];
1819
1820                                 ctrls[0] = NULL;
1821                                 ctrls[1] = NULL;
1822                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1823                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1824                                 rs->sr_ctrls = ctrls;
1825                                 rs->sr_err = LDAP_SUCCESS;
1826                                 send_ldap_result( op, rs );
1827                                 rs->sr_ctrls = NULL;
1828                                 return rs->sr_err;
1829                         }
1830                         goto shortcut;
1831                 }
1832                 /* Do we have a sessionlog for this search? */
1833                 sl=si->si_logs;
1834                 if ( sl ) {
1835                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1836                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1837                                 do_present = 0;
1838                                 /* mutex is unlocked in playlog */
1839                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1840                         } else {
1841                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1842                         }
1843                 }
1844                 /* Is the CSN still present in the database? */
1845                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1846                         /* No, so a reload is required */
1847 #if 0           /* the consumer doesn't seem to send this hint */
1848                         if ( op->o_sync_rhint == 0 ) {
1849                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1850                                 return rs->sr_err;
1851                         }
1852 #endif
1853                 } else {
1854                         gotstate = 1;
1855                         /* If changed and doing Present lookup, send Present UUIDs */
1856                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1857                                 LDAP_SUCCESS ) {
1858                                 send_ldap_result( op, rs );
1859                                 return rs->sr_err;
1860                         }
1861                 }
1862         }
1863
1864 shortcut:
1865         /* Append CSN range to search filter, save original filter
1866          * for persistent search evaluation
1867          */
1868         if ( sop ) {
1869                 sop->s_filterstr= op->ors_filterstr;
1870         }
1871
1872         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1873         fand->f_choice = LDAP_FILTER_AND;
1874         fand->f_next = NULL;
1875         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1876         fava->f_choice = LDAP_FILTER_LE;
1877         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1878         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1879 #ifdef LDAP_COMP_MATCH
1880         fava->f_ava->aa_cf = NULL;
1881 #endif
1882         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1883         fand->f_and = fava;
1884         if ( gotstate ) {
1885                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1886                 fava = fava->f_next;
1887                 fava->f_choice = LDAP_FILTER_GE;
1888                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1889                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1890 #ifdef LDAP_COMP_MATCH
1891                 fava->f_ava->aa_cf = NULL;
1892 #endif
1893                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1894         }
1895         fava->f_next = op->ors_filter;
1896         op->ors_filter = fand;
1897         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1898
1899         /* Let our callback add needed info to returned entries */
1900         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1901         ss = (searchstate *)(cb+1);
1902         ss->ss_on = on;
1903         ss->ss_so = sop;
1904         ss->ss_present = do_present;
1905         cb->sc_response = syncprov_search_response;
1906         cb->sc_cleanup = syncprov_search_cleanup;
1907         cb->sc_private = ss;
1908         cb->sc_next = op->o_callback;
1909         op->o_callback = cb;
1910
1911 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1912         op->o_sync_mode &= SLAP_CONTROL_MASK;
1913 #endif
1914
1915         /* If this is a persistent search and no changes were reported during
1916          * the refresh phase, just invoke the response callback to transition
1917          * us into persist phase
1918          */
1919         if ( nochange ) {
1920                 rs->sr_err = LDAP_SUCCESS;
1921                 rs->sr_nentries = 0;
1922                 send_ldap_result( op, rs );
1923                 return rs->sr_err;
1924         }
1925         return SLAP_CB_CONTINUE;
1926 }
1927
1928 static int
1929 syncprov_operational(
1930         Operation *op,
1931         SlapReply *rs )
1932 {
1933         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1934         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1935
1936         if ( rs->sr_entry &&
1937                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1938
1939                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1940                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1941                         Attribute *a, **ap = NULL;
1942
1943                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1944                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1945                                         break;
1946                         }
1947
1948                         if ( !a ) {
1949                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1950
1951                                 a = ch_malloc( sizeof(Attribute));
1952                                 a->a_desc = slap_schema.si_ad_contextCSN;
1953                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1954                                 a->a_vals[1].bv_val = NULL;
1955                                 a->a_nvals = a->a_vals;
1956                                 a->a_next = NULL;
1957                                 a->a_flags = 0;
1958                                 *ap = a;
1959                         }
1960
1961                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1962                         if ( !ap ) {
1963                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1964                         } else {
1965                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1966                         }
1967                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1968                 }
1969         }
1970         return SLAP_CB_CONTINUE;
1971 }
1972
1973 static int
1974 syncprov_db_config(
1975         BackendDB       *be,
1976         const char      *fname,
1977         int             lineno,
1978         int             argc,
1979         char    **argv
1980 )
1981 {
1982         slap_overinst           *on = (slap_overinst *)be->bd_info;
1983         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1984
1985         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1986                 if ( argc != 3 ) {
1987                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1988                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1989                         return -1;
1990                 }
1991                 si->si_chkops = atoi( argv[1] );
1992                 si->si_chktime = atoi( argv[2] ) * 60;
1993                 return 0;
1994
1995         } else if ( strcasecmp( argv[0], "syncprov-sessionlog" ) == 0 ) {
1996                 sessionlog *sl;
1997                 int size;
1998                 if ( argc != 2 ) {
1999                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
2000                                 "\"syncprov-sessionlog <size>\"\n", fname, lineno );
2001                         return -1;
2002                 }
2003                 size = atoi( argv[1] );
2004                 if ( size < 0 ) {
2005                         fprintf( stderr,
2006                                 "%s: line %d: session log size %d is negative\n",
2007                                 fname, lineno, size );
2008                         return -1;
2009                 }
2010                 sl = si->si_logs;
2011                 if ( !sl ) {
2012                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2013                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2014                         sl->sl_mincsn.bv_len = 0;
2015                         sl->sl_num = 0;
2016                         sl->sl_head = sl->sl_tail = NULL;
2017                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2018                         si->si_logs = sl;
2019                 }
2020                 sl->sl_size = size;
2021                 return 0;
2022         }
2023
2024         return SLAP_CONF_UNKNOWN;
2025 }
2026
2027 /* Cheating - we have no thread pool context for these functions,
2028  * so make one.
2029  */
2030 typedef struct thread_keys {
2031         void *key;
2032         void *data;
2033         ldap_pvt_thread_pool_keyfree_t *xfree;
2034 } thread_keys;
2035
2036 #define MAXKEYS 32
2037 /* A fake thread context */
2038 static thread_keys thrctx[MAXKEYS];
2039
2040 /* Read any existing contextCSN from the underlying db.
2041  * Then search for any entries newer than that. If no value exists,
2042  * just generate it. Cache whatever result.
2043  */
2044 static int
2045 syncprov_db_open(
2046     BackendDB *be
2047 )
2048 {
2049         slap_overinst   *on = (slap_overinst *) be->bd_info;
2050         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2051
2052         Connection conn;
2053         char opbuf[OPERATION_BUFFER_SIZE];
2054         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2055         Operation *op = (Operation *)opbuf;
2056         Entry *e;
2057         Attribute *a;
2058         int rc;
2059
2060         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2061         if ( rc ) {
2062                 return rc;
2063         }
2064
2065         connection_fake_init( &conn, op, thrctx );
2066         op->o_bd = be;
2067         op->o_dn = be->be_rootdn;
2068         op->o_ndn = be->be_rootndn;
2069
2070         ctxcsnbuf[0] = '\0';
2071
2072         op->o_bd->bd_info = on->on_info->oi_orig;
2073         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2074                 slap_schema.si_ad_contextCSN, 0, &e );
2075
2076         if ( e ) {
2077                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2078                 if ( a ) {
2079                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2080                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2081                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2082                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2083                                 si->si_ctxcsn.bv_len );
2084                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2085                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2086                 }
2087                 be_entry_release_rw( op, e, 0 );
2088                 op->o_bd->bd_info = (BackendInfo *)on;
2089                 op->o_req_dn = be->be_suffix[0];
2090                 op->o_req_ndn = be->be_nsuffix[0];
2091                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2092                 syncprov_findcsn( op, FIND_MAXCSN );
2093         }
2094
2095         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2096                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2097                                 &si->si_ctxcsn, 0 );
2098         }
2099
2100         /* If our ctxcsn is different from what was read from the root
2101          * entry, write the new value out.
2102          */
2103         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2104                 SlapReply rs = {REP_RESULT};
2105                 syncprov_checkpoint( op, &rs, on );
2106         }
2107
2108         op->o_bd->bd_info = (BackendInfo *)on;
2109         return 0;
2110 }
2111
2112 /* Write the current contextCSN into the underlying db.
2113  */
2114 static int
2115 syncprov_db_close(
2116     BackendDB *be
2117 )
2118 {
2119     slap_overinst   *on = (slap_overinst *) be->bd_info;
2120     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2121         int i;
2122
2123         if ( si->si_numops ) {
2124                 Connection conn;
2125                 char opbuf[OPERATION_BUFFER_SIZE];
2126                 Operation *op = (Operation *)opbuf;
2127                 SlapReply rs = {REP_RESULT};
2128
2129                 connection_fake_init( &conn, op, thrctx );
2130                 op->o_bd = be;
2131                 op->o_dn = be->be_rootdn;
2132                 op->o_ndn = be->be_rootndn;
2133                 syncprov_checkpoint( op, &rs, on );
2134         }
2135         for ( i=0; thrctx[i].key; i++) {
2136                 if ( thrctx[i].xfree )
2137                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2138                 thrctx[i].key = NULL;
2139         }
2140
2141     return 0;
2142 }
2143
2144 static int
2145 syncprov_db_init(
2146         BackendDB *be
2147 )
2148 {
2149         slap_overinst   *on = (slap_overinst *)be->bd_info;
2150         syncprov_info_t *si;
2151
2152         si = ch_calloc(1, sizeof(syncprov_info_t));
2153         on->on_bi.bi_private = si;
2154         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2155         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2156         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2157         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2158
2159         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2160         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2161
2162         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2163         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2164
2165         return 0;
2166 }
2167
2168 static int
2169 syncprov_db_destroy(
2170         BackendDB *be
2171 )
2172 {
2173         slap_overinst   *on = (slap_overinst *)be->bd_info;
2174         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2175
2176         if ( si ) {
2177                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2178                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2179                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2180                 ch_free( si );
2181         }
2182
2183         return 0;
2184 }
2185
2186 static int syncprov_parseCtrl (
2187         Operation *op,
2188         SlapReply *rs,
2189         LDAPControl *ctrl )
2190 {
2191         ber_tag_t tag;
2192         BerElement *ber;
2193         ber_int_t mode;
2194         ber_len_t len;
2195         struct berval cookie = BER_BVNULL;
2196         sync_control *sr;
2197         int rhint = 0;
2198
2199         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2200                 rs->sr_text = "Sync control specified multiple times";
2201                 return LDAP_PROTOCOL_ERROR;
2202         }
2203
2204         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2205                 rs->sr_text = "Sync control specified with pagedResults control";
2206                 return LDAP_PROTOCOL_ERROR;
2207         }
2208
2209         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2210                 rs->sr_text = "Sync control value is empty (or absent)";
2211                 return LDAP_PROTOCOL_ERROR;
2212         }
2213
2214         /* Parse the control value
2215          *      syncRequestValue ::= SEQUENCE {
2216          *              mode   ENUMERATED {
2217          *                      -- 0 unused
2218          *                      refreshOnly             (1),
2219          *                      -- 2 reserved
2220          *                      refreshAndPersist       (3)
2221          *              },
2222          *              cookie  syncCookie OPTIONAL
2223          *      }
2224          */
2225
2226         ber = ber_init( &ctrl->ldctl_value );
2227         if( ber == NULL ) {
2228                 rs->sr_text = "internal error";
2229                 return LDAP_OTHER;
2230         }
2231
2232         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2233                 rs->sr_text = "Sync control : mode decoding error";
2234                 return LDAP_PROTOCOL_ERROR;
2235         }
2236
2237         switch( mode ) {
2238         case LDAP_SYNC_REFRESH_ONLY:
2239                 mode = SLAP_SYNC_REFRESH;
2240                 break;
2241         case LDAP_SYNC_REFRESH_AND_PERSIST:
2242                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2243                 break;
2244         default:
2245                 rs->sr_text = "Sync control : unknown update mode";
2246                 return LDAP_PROTOCOL_ERROR;
2247         }
2248
2249         tag = ber_peek_tag( ber, &len );
2250
2251         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2252                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
2253                         rs->sr_text = "Sync control : cookie decoding error";
2254                         return LDAP_PROTOCOL_ERROR;
2255                 }
2256         }
2257         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2258                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2259                         rs->sr_text = "Sync control : rhint decoding error";
2260                         return LDAP_PROTOCOL_ERROR;
2261                 }
2262         }
2263         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2264                         rs->sr_text = "Sync control : decoding error";
2265                         return LDAP_PROTOCOL_ERROR;
2266         }
2267         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2268         sr->sr_rhint = rhint;
2269         if (!BER_BVISNULL(&cookie)) {
2270                 ber_dupbv( &sr->sr_state.octet_str, &cookie );
2271                 slap_parse_sync_cookie( &sr->sr_state );
2272         }
2273
2274         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2275
2276         (void) ber_free( ber, 1 );
2277
2278         op->o_sync = ctrl->ldctl_iscritical
2279                 ? SLAP_CONTROL_CRITICAL
2280                 : SLAP_CONTROL_NONCRITICAL;
2281
2282         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2283
2284         return LDAP_SUCCESS;
2285 }
2286
2287 /* This overlay is set up for dynamic loading via moduleload. For static
2288  * configuration, you'll need to arrange for the slap_overinst to be
2289  * initialized and registered by some other function inside slapd.
2290  */
2291
2292 static slap_overinst            syncprov;
2293
2294 int
2295 syncprov_init()
2296 {
2297         int rc;
2298
2299         rc = register_supported_control( LDAP_CONTROL_SYNC,
2300                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2301                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2302         if ( rc != LDAP_SUCCESS ) {
2303                 fprintf( stderr, "Failed to register control %d\n", rc );
2304                 return rc;
2305         }
2306
2307         syncprov.on_bi.bi_type = "syncprov";
2308         syncprov.on_bi.bi_db_init = syncprov_db_init;
2309         syncprov.on_bi.bi_db_config = syncprov_db_config;
2310         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2311         syncprov.on_bi.bi_db_open = syncprov_db_open;
2312         syncprov.on_bi.bi_db_close = syncprov_db_close;
2313
2314         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2315         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2316
2317         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2318         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2319         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2320         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2321         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2322         syncprov.on_bi.bi_op_search = syncprov_op_search;
2323         syncprov.on_bi.bi_extended = syncprov_op_extended;
2324         syncprov.on_bi.bi_operational = syncprov_operational;
2325
2326         return overlay_register( &syncprov );
2327 }
2328
2329 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2330 int
2331 init_module( int argc, char *argv[] )
2332 {
2333         return syncprov_init();
2334 }
2335 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2336
2337 #endif /* defined(SLAPD_OVER_SYNCPROV) */