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 2004-2009 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 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74
  75         int             s_inuse;        /* reference count */
  76         struct syncres *s_res;
  77         struct syncres *s_restail;
  78         struct re_s     *s_qtask;       /* task for playing psearch responses */
  79 #define RUNQ_INTERVAL   36000   /* a long time */
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         struct berval   sl_mincsn;
 117         int             sl_num;
 118         int             sl_size;
 119         slog_entry *sl_head;
 120         slog_entry *sl_tail;
 121         ldap_pvt_thread_mutex_t sl_mutex;
 122 } sessionlog;
 123
 124 /* The main state for this overlay */
 125 typedef struct syncprov_info_t {
 126         syncops         *si_ops;
 127         BerVarray       si_ctxcsn;      /* ldapsync context */
 128         int             *si_sids;
 129         int             si_numcsns;
 130         int             si_chkops;      /* checkpointing info */
 131         int             si_chktime;
 132         int             si_numops;      /* number of ops since last checkpoint */
 133         int             si_nopres;      /* Skip present phase */
 134         int             si_usehint;     /* use reload hint */
 135         time_t  si_chklast;     /* time of last checkpoint */
 136         Avlnode *si_mods;       /* entries being modified */
 137         sessionlog      *si_logs;
 138         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 139         ldap_pvt_thread_mutex_t si_ops_mutex;
 140         ldap_pvt_thread_mutex_t si_mods_mutex;
 141 } syncprov_info_t;
 142
 143 typedef struct opcookie {
 144         slap_overinst *son;
 145         syncmatches *smatches;
 146         struct berval sdn;      /* DN of entry, for deletes */
 147         struct berval sndn;
 148         struct berval suuid;    /* UUID of entry */
 149         struct berval sctxcsn;
 150         int sreference; /* Is the entry a reference? */
 151 } opcookie;
 152
 153 typedef struct fbase_cookie {
 154         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 155         syncops *fss;   /* persistent search we're testing against */
 156         int fbase;      /* if TRUE we found the search base and it's still valid */
 157         int fscope;     /* if TRUE then fdn is within the psearch scope */
 158 } fbase_cookie;
 159
 160 static AttributeName csn_anlist[3];
 161 static AttributeName uuid_anlist[2];
 162
 163 /* Build a LDAPsync intermediate state control */
 164 static int
 165 syncprov_state_ctrl(
 166         Operation       *op,
 167         SlapReply       *rs,
 168         Entry           *e,
 169         int             entry_sync_state,
 170         LDAPControl     **ctrls,
 171         int             num_ctrls,
 172         int             send_cookie,
 173         struct berval   *cookie )
 174 {
 175         Attribute* a;
 176         int ret;
 177
 178         BerElementBuffer berbuf;
 179         BerElement *ber = (BerElement *)&berbuf;
 180
 181         struct berval   entryuuid_bv = BER_BVNULL;
 182
 183         ber_init2( ber, 0, LBER_USE_DER );
 184         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 185
 186         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 187
 188         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 189                 AttributeDescription *desc = a->a_desc;
 190                 if ( desc == slap_schema.si_ad_entryUUID ) {
 191                         entryuuid_bv = a->a_nvals[0];
 192                         break;
 193                 }
 194         }
 195
 196         /* FIXME: what if entryuuid is NULL or empty ? */
 197
 198         if ( send_cookie && cookie ) {
 199                 ber_printf( ber, "{eOON}",
 200                         entry_sync_state, &entryuuid_bv, cookie );
 201         } else {
 202                 ber_printf( ber, "{eON}",
 203                         entry_sync_state, &entryuuid_bv );
 204         }
 205
 206         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 207         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 208         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 209
 210         ber_free_buf( ber );
 211
 212         if ( ret < 0 ) {
 213                 Debug( LDAP_DEBUG_TRACE,
 214                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 215                         0, 0, 0 );
 216                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 217                 return ret;
 218         }
 219
 220         return LDAP_SUCCESS;
 221 }
 222
 223 /* Build a LDAPsync final state control */
 224 static int
 225 syncprov_done_ctrl(
 226         Operation       *op,
 227         SlapReply       *rs,
 228         LDAPControl     **ctrls,
 229         int                     num_ctrls,
 230         int                     send_cookie,
 231         struct berval *cookie,
 232         int                     refreshDeletes )
 233 {
 234         int ret;
 235         BerElementBuffer berbuf;
 236         BerElement *ber = (BerElement *)&berbuf;
 237
 238         ber_init2( ber, NULL, LBER_USE_DER );
 239         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 240
 241         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 242
 243         ber_printf( ber, "{" );
 244         if ( send_cookie && cookie ) {
 245                 ber_printf( ber, "O", cookie );
 246         }
 247         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 248                 ber_printf( ber, "b", refreshDeletes );
 249         }
 250         ber_printf( ber, "N}" );
 251
 252         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 253         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 254         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 255
 256         ber_free_buf( ber );
 257
 258         if ( ret < 0 ) {
 259                 Debug( LDAP_DEBUG_TRACE,
 260                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 261                         0, 0, 0 );
 262                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 263                 return ret;
 264         }
 265
 266         return LDAP_SUCCESS;
 267 }
 268
 269 static int
 270 syncprov_sendinfo(
 271         Operation       *op,
 272         SlapReply       *rs,
 273         int                     type,
 274         struct berval *cookie,
 275         int                     refreshDone,
 276         BerVarray       syncUUIDs,
 277         int                     refreshDeletes )
 278 {
 279         BerElementBuffer berbuf;
 280         BerElement *ber = (BerElement *)&berbuf;
 281         struct berval rspdata;
 282
 283         int ret;
 284
 285         ber_init2( ber, NULL, LBER_USE_DER );
 286         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 287
 288         if ( type ) {
 289                 switch ( type ) {
 290                 case LDAP_TAG_SYNC_NEW_COOKIE:
 291                         ber_printf( ber, "tO", type, cookie );
 292                         break;
 293                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 294                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 295                         ber_printf( ber, "t{", type );
 296                         if ( cookie ) {
 297                                 ber_printf( ber, "O", cookie );
 298                         }
 299                         if ( refreshDone == 0 ) {
 300                                 ber_printf( ber, "b", refreshDone );
 301                         }
 302                         ber_printf( ber, "N}" );
 303                         break;
 304                 case LDAP_TAG_SYNC_ID_SET:
 305                         ber_printf( ber, "t{", type );
 306                         if ( cookie ) {
 307                                 ber_printf( ber, "O", cookie );
 308                         }
 309                         if ( refreshDeletes == 1 ) {
 310                                 ber_printf( ber, "b", refreshDeletes );
 311                         }
 312                         ber_printf( ber, "[W]", syncUUIDs );
 313                         ber_printf( ber, "N}" );
 314                         break;
 315                 default:
 316                         Debug( LDAP_DEBUG_TRACE,
 317                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 318                                 type, 0, 0 );
 319                         return LDAP_OTHER;
 320                 }
 321         }
 322
 323         ret = ber_flatten2( ber, &rspdata, 0 );
 324
 325         if ( ret < 0 ) {
 326                 Debug( LDAP_DEBUG_TRACE,
 327                         "syncprov_sendinfo: ber_flatten2 failed\n",
 328                         0, 0, 0 );
 329                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 330                 return ret;
 331         }
 332
 333         rs->sr_rspoid = LDAP_SYNC_INFO;
 334         rs->sr_rspdata = &rspdata;
 335         send_ldap_intermediate( op, rs );
 336         rs->sr_rspdata = NULL;
 337         ber_free_buf( ber );
 338
 339         return LDAP_SUCCESS;
 340 }
 341
 342 /* Find a modtarget in an AVL tree */
 343 static int
 344 sp_avl_cmp( const void *c1, const void *c2 )
 345 {
 346         const modtarget *m1, *m2;
 347         int rc;
 348
 349         m1 = c1; m2 = c2;
 350         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 351
 352         if ( rc ) return rc;
 353         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 354 }
 355
 356 /* syncprov_findbase:
 357  *   finds the true DN of the base of a search (with alias dereferencing) and
 358  * checks to make sure the base entry doesn't get replaced with a different
 359  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 360  * change is detected, any persistent search on this base must be terminated /
 361  * reloaded.
 362  *   On the first call, we just save the DN and entryID. On subsequent calls
 363  * we compare the DN and entryID with the saved values.
 364  */
 365 static int
 366 findbase_cb( Operation *op, SlapReply *rs )
 367 {
 368         slap_callback *sc = op->o_callback;
 369
 370         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 371                 fbase_cookie *fc = sc->sc_private;
 372
 373                 /* If no entryID, we're looking for the first time.
 374                  * Just store whatever we got.
 375                  */
 376                 if ( fc->fss->s_eid == NOID ) {
 377                         fc->fbase = 2;
 378                         fc->fss->s_eid = rs->sr_entry->e_id;
 379                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 380
 381                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 382                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 383
 384                 /* OK, the DN is the same and the entryID is the same. */
 385                         fc->fbase = 1;
 386                 }
 387         }
 388         if ( rs->sr_err != LDAP_SUCCESS ) {
 389                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 390         }
 391         return LDAP_SUCCESS;
 392 }
 393
 394 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 395 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 396
 397 static int
 398 syncprov_findbase( Operation *op, fbase_cookie *fc )
 399 {
 400         /* Use basic parameters from syncrepl search, but use
 401          * current op's threadctx / tmpmemctx
 402          */
 403         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 404         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 405                 slap_callback cb = {0};
 406                 Operation fop;
 407                 SlapReply frs = { REP_RESULT };
 408                 int rc;
 409
 410                 fc->fss->s_flags ^= PS_FIND_BASE;
 411                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 412
 413                 fop = *fc->fss->s_op;
 414
 415                 fop.o_bd = fop.o_bd->bd_self;
 416                 fop.o_hdr = op->o_hdr;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419
 420                 cb.sc_response = findbase_cb;
 421                 cb.sc_private = fc;
 422
 423                 fop.o_sync_mode = 0;    /* turn off sync mode */
 424                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 425                 fop.o_callback = &cb;
 426                 fop.o_tag = LDAP_REQ_SEARCH;
 427                 fop.ors_scope = LDAP_SCOPE_BASE;
 428                 fop.ors_limit = NULL;
 429                 fop.ors_slimit = 1;
 430                 fop.ors_tlimit = SLAP_NO_LIMIT;
 431                 fop.ors_attrs = slap_anlist_no_attrs;
 432                 fop.ors_attrsonly = 1;
 433                 fop.ors_filter = &generic_filter;
 434                 fop.ors_filterstr = generic_filterstr;
 435
 436                 rc = fop.o_bd->be_search( &fop, &frs );
 437         } else {
 438                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 439                 fc->fbase = 1;
 440         }
 441
 442         /* After the first call, see if the fdn resides in the scope */
 443         if ( fc->fbase == 1 ) {
 444                 switch ( fc->fss->s_op->ors_scope ) {
 445                 case LDAP_SCOPE_BASE:
 446                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 447                         break;
 448                 case LDAP_SCOPE_ONELEVEL: {
 449                         struct berval pdn;
 450                         dnParent( fc->fdn, &pdn );
 451                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 452                         break; }
 453                 case LDAP_SCOPE_SUBTREE:
 454                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 455                         break;
 456                 case LDAP_SCOPE_SUBORDINATE:
 457                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 458                                 !dn_match( fc->fdn, &fc->fss->s_base );
 459                         break;
 460                 }
 461         }
 462
 463         if ( fc->fbase )
 464                 return LDAP_SUCCESS;
 465
 466         /* If entryID has changed, then the base of this search has
 467          * changed. Invalidate the psearch.
 468          */
 469         return LDAP_NO_SUCH_OBJECT;
 470 }
 471
 472 /* syncprov_findcsn:
 473  *   This function has three different purposes, but they all use a search
 474  * that filters on entryCSN so they're combined here.
 475  * 1: at startup time, after a contextCSN has been read from the database,
 476  * we search for all entries with CSN >= contextCSN in case the contextCSN
 477  * was not checkpointed at the previous shutdown.
 478  *
 479  * 2: when the current contextCSN is known and we have a sync cookie, we search
 480  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 481  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 482  *
 483  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 484  * CSN, and generate Present records for them. We always collect this result
 485  * in SyncID sets, even if there's only one match.
 486  */
 487 typedef enum find_csn_t {
 488         FIND_MAXCSN     = 1,
 489         FIND_CSN        = 2,
 490         FIND_PRESENT    = 3
 491 } find_csn_t;
 492
 493 static int
 494 findmax_cb( Operation *op, SlapReply *rs )
 495 {
 496         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 497                 struct berval *maxcsn = op->o_callback->sc_private;
 498                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 499                         slap_schema.si_ad_entryCSN );
 500
 501                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 502                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 503                         maxcsn->bv_len = a->a_vals[0].bv_len;
 504                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 505                 }
 506         }
 507         return LDAP_SUCCESS;
 508 }
 509
 510 static int
 511 findcsn_cb( Operation *op, SlapReply *rs )
 512 {
 513         slap_callback *sc = op->o_callback;
 514
 515         /* We just want to know that at least one exists, so it's OK if
 516          * we exceed the unchecked limit.
 517          */
 518         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 519                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 520                 sc->sc_private = (void *)1;
 521         }
 522         return LDAP_SUCCESS;
 523 }
 524
 525 /* Build a list of entryUUIDs for sending in a SyncID set */
 526
 527 #define UUID_LEN        16
 528
 529 typedef struct fpres_cookie {
 530         int num;
 531         BerVarray uuids;
 532         char *last;
 533 } fpres_cookie;
 534
 535 static int
 536 findpres_cb( Operation *op, SlapReply *rs )
 537 {
 538         slap_callback *sc = op->o_callback;
 539         fpres_cookie *pc = sc->sc_private;
 540         Attribute *a;
 541         int ret = SLAP_CB_CONTINUE;
 542
 543         switch ( rs->sr_type ) {
 544         case REP_SEARCH:
 545                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 546                 if ( a ) {
 547                         pc->uuids[pc->num].bv_val = pc->last;
 548                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 549                                 pc->uuids[pc->num].bv_len );
 550                         pc->num++;
 551                         pc->last = pc->uuids[pc->num].bv_val;
 552                         pc->uuids[pc->num].bv_val = NULL;
 553                 }
 554                 ret = LDAP_SUCCESS;
 555                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 556                         break;
 557                 /* FALLTHRU */
 558         case REP_RESULT:
 559                 ret = rs->sr_err;
 560                 if ( pc->num ) {
 561                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 562                                 0, pc->uuids, 0 );
 563                         pc->uuids[pc->num].bv_val = pc->last;
 564                         pc->num = 0;
 565                         pc->last = pc->uuids[0].bv_val;
 566                 }
 567                 break;
 568         default:
 569                 break;
 570         }
 571         return ret;
 572 }
 573
 574 static int
 575 syncprov_findcsn( Operation *op, find_csn_t mode )
 576 {
 577         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 578         syncprov_info_t         *si = on->on_bi.bi_private;
 579
 580         slap_callback cb = {0};
 581         Operation fop;
 582         SlapReply frs = { REP_RESULT };
 583         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 584         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 585         struct berval maxcsn;
 586         Filter cf;
 587         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 588         fpres_cookie pcookie;
 589         sync_control *srs = NULL;
 590         struct slap_limits_set fc_limits;
 591         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 592         int maxid;
 593
 594         if ( mode != FIND_MAXCSN ) {
 595                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 596         }
 597
 598         fop = *op;
 599         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 600         /* We want pure entries, not referrals */
 601         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 602
 603         cf.f_ava = &eq;
 604         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 605         BER_BVZERO( &cf.f_av_value );
 606         cf.f_next = NULL;
 607
 608         fop.o_callback = &cb;
 609         fop.ors_limit = NULL;
 610         fop.ors_tlimit = SLAP_NO_LIMIT;
 611         fop.ors_filter = &cf;
 612         fop.ors_filterstr.bv_val = buf;
 613
 614 again:
 615         switch( mode ) {
 616         case FIND_MAXCSN:
 617                 cf.f_choice = LDAP_FILTER_GE;
 618                 /* If there are multiple CSNs, use the one with our serverID */
 619                 for ( i=0; i<si->si_numcsns; i++) {
 620                         if ( slap_serverID == si->si_sids[i] ) {
 621                                 maxid = i;
 622                                 break;
 623                         }
 624                 }
 625                 if ( i == si->si_numcsns ) {
 626                         /* No match: this is multimaster, and none of the content in the DB
 627                          * originated locally. Treat like no CSN.
 628                          */
 629                         return LDAP_NO_SUCH_OBJECT;
 630                 }
 631                 cf.f_av_value = si->si_ctxcsn[maxid];
 632                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 633                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 634                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 635                         return LDAP_OTHER;
 636                 }
 637                 fop.ors_attrsonly = 0;
 638                 fop.ors_attrs = csn_anlist;
 639                 fop.ors_slimit = SLAP_NO_LIMIT;
 640                 cb.sc_private = &maxcsn;
 641                 cb.sc_response = findmax_cb;
 642                 strcpy( cbuf, cf.f_av_value.bv_val );
 643                 maxcsn.bv_val = cbuf;
 644                 maxcsn.bv_len = cf.f_av_value.bv_len;
 645                 break;
 646         case FIND_CSN:
 647                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 648                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 649                         /* If there are multiple CSNs, use the smallest */
 650                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 651                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 652                                         > 0 ) {
 653                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 654                                 }
 655                         }
 656                 }
 657                 /* Look for exact match the first time */
 658                 if ( findcsn_retry ) {
 659                         cf.f_choice = LDAP_FILTER_EQUALITY;
 660                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 661                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 662                 /* On retry, look for <= */
 663                 } else {
 664                         cf.f_choice = LDAP_FILTER_LE;
 665                         fop.ors_limit = &fc_limits;
 666                         memset( &fc_limits, 0, sizeof( fc_limits ));
 667                         fc_limits.lms_s_unchecked = 1;
 668                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 669                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 670                 }
 671                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 672                         return LDAP_OTHER;
 673                 }
 674                 fop.ors_attrsonly = 1;
 675                 fop.ors_attrs = slap_anlist_no_attrs;
 676                 fop.ors_slimit = 1;
 677                 cb.sc_private = NULL;
 678                 cb.sc_response = findcsn_cb;
 679                 break;
 680         case FIND_PRESENT:
 681                 fop.ors_filter = op->ors_filter;
 682                 fop.ors_filterstr = op->ors_filterstr;
 683                 fop.ors_attrsonly = 0;
 684                 fop.ors_attrs = uuid_anlist;
 685                 fop.ors_slimit = SLAP_NO_LIMIT;
 686                 cb.sc_private = &pcookie;
 687                 cb.sc_response = findpres_cb;
 688                 pcookie.num = 0;
 689
 690                 /* preallocate storage for a full set */
 691                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 692                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 693                         op->o_tmpmemctx );
 694                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 695                 pcookie.uuids[0].bv_val = pcookie.last;
 696                 pcookie.uuids[0].bv_len = UUID_LEN;
 697                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 698                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 699                         pcookie.uuids[i].bv_len = UUID_LEN;
 700                 }
 701                 break;
 702         }
 703
 704         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 705         fop.o_bd->be_search( &fop, &frs );
 706         fop.o_bd->bd_info = (BackendInfo *)on;
 707
 708         switch( mode ) {
 709         case FIND_MAXCSN:
 710                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 711 #ifdef CHECK_CSN
 712                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 713                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 714 #endif
 715                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 716                         si->si_numops++;        /* ensure a checkpoint */
 717                 }
 718                 break;
 719         case FIND_CSN:
 720                 /* If matching CSN was not found, invalidate the context. */
 721                 if ( !cb.sc_private ) {
 722                         /* If we didn't find an exact match, then try for <= */
 723                         if ( findcsn_retry ) {
 724                                 findcsn_retry = 0;
 725                                 goto again;
 726                         }
 727                         rc = LDAP_NO_SUCH_OBJECT;
 728                 }
 729                 break;
 730         case FIND_PRESENT:
 731                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 732                 break;
 733         }
 734
 735         return rc;
 736 }
 737
 738 static void
 739 syncprov_free_syncop( syncops *so )
 740 {
 741         syncres *sr, *srnext;
 742         GroupAssertion *ga, *gnext;
 743
 744         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 745         if ( --so->s_inuse > 0 ) {
 746                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 747                 return;
 748         }
 749         if ( so->s_qtask ) {
 750                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 751                 if ( ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) )
 752                         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 753                 ldap_pvt_runqueue_remove( &slapd_rq, so->s_qtask );
 754                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 755         }
 756         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 757         if ( so->s_flags & PS_IS_DETACHED ) {
 758                 filter_free( so->s_op->ors_filter );
 759                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 760                         gnext = ga->ga_next;
 761                         ch_free( ga );
 762                 }
 763                 ch_free( so->s_op );
 764         }
 765         ch_free( so->s_base.bv_val );
 766         for ( sr=so->s_res; sr; sr=srnext ) {
 767                 srnext = sr->s_next;
 768                 ch_free( sr );
 769         }
 770         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 771         ch_free( so );
 772 }
 773
 774 /* Send a persistent search response */
 775 static int
 776 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 777         Entry **e, int mode )
 778 {
 779         slap_overinst *on = opc->son;
 780
 781         SlapReply rs = { REP_SEARCH };
 782         LDAPControl *ctrls[2];
 783         struct berval cookie, csns[2];
 784         Entry e_uuid = {0};
 785         Attribute a_uuid = {0};
 786
 787         if ( so->s_op->o_abandon )
 788                 return SLAPD_ABANDON;
 789
 790         ctrls[1] = NULL;
 791         csns[0] = opc->sctxcsn;
 792         BER_BVZERO( &csns[1] );
 793         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 794
 795         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 796
 797         e_uuid.e_attrs = &a_uuid;
 798         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 799         a_uuid.a_nvals = &opc->suuid;
 800         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 801                 mode, ctrls, 0, 1, &cookie );
 802         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 803
 804         rs.sr_ctrls = ctrls;
 805         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 806         switch( mode ) {
 807         case LDAP_SYNC_ADD:
 808                 rs.sr_entry = *e;
 809                 if ( rs.sr_entry->e_private )
 810                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 811                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 812                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 813                         rs.sr_err = send_search_reference( op, &rs );
 814                         ber_bvarray_free( rs.sr_ref );
 815                         if ( !rs.sr_entry )
 816                                 *e = NULL;
 817                         break;
 818                 }
 819                 /* fallthru */
 820         case LDAP_SYNC_MODIFY:
 821                 rs.sr_entry = *e;
 822                 if ( rs.sr_entry->e_private )
 823                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 824                 rs.sr_attrs = op->ors_attrs;
 825                 rs.sr_err = send_search_entry( op, &rs );
 826                 if ( !rs.sr_entry )
 827                         *e = NULL;
 828                 break;
 829         case LDAP_SYNC_DELETE:
 830                 e_uuid.e_attrs = NULL;
 831                 e_uuid.e_name = opc->sdn;
 832                 e_uuid.e_nname = opc->sndn;
 833                 rs.sr_entry = &e_uuid;
 834                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 835                         struct berval bv = BER_BVNULL;
 836                         rs.sr_ref = &bv;
 837                         rs.sr_err = send_search_reference( op, &rs );
 838                 } else {
 839                         rs.sr_err = send_search_entry( op, &rs );
 840                 }
 841                 break;
 842         default:
 843                 assert(0);
 844         }
 845         /* In case someone else freed it already? */
 846         if ( rs.sr_ctrls ) {
 847                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 848                 rs.sr_ctrls = NULL;
 849         }
 850
 851         return rs.sr_err;
 852 }
 853
 854 /* Play back queued responses */
 855 static int
 856 syncprov_qplay( Operation *op, struct re_s *rtask )
 857 {
 858         syncops *so = rtask->arg;
 859         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 860         syncres *sr;
 861         Entry *e;
 862         opcookie opc;
 863         int rc = 0;
 864
 865         opc.son = on;
 866
 867         for (;;) {
 868                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 869                 sr = so->s_res;
 870                 if ( sr )
 871                         so->s_res = sr->s_next;
 872                 if ( !so->s_res )
 873                         so->s_restail = NULL;
 874                 /* Exit loop with mutex held */
 875                 if ( !sr || so->s_op->o_abandon )
 876                         break;
 877                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 878
 879                 opc.sdn = sr->s_dn;
 880                 opc.sndn = sr->s_ndn;
 881                 opc.suuid = sr->s_uuid;
 882                 opc.sctxcsn = sr->s_csn;
 883                 opc.sreference = sr->s_isreference;
 884                 e = NULL;
 885
 886                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 887                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 888                         if ( rc ) {
 889                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 890                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 891                                 ch_free( sr );
 892                                 rc = 0;
 893                                 continue;
 894                         }
 895                 }
 896                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 897
 898                 if ( e ) {
 899                         overlay_entry_release_ov( op, e, 0, on );
 900                 }
 901
 902                 ch_free( sr );
 903
 904                 if ( rc ) {
 905                         /* Exit loop with mutex held */
 906                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 907                         break;
 908                 }
 909         }
 910
 911         /* wait until we get explicitly scheduled again */
 912         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 913         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 914         if ( rc == 0 ) {
 915                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 916         } else {
 917                 /* bail out on any error */
 918                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 919
 920                 /* Prevent duplicate remove */
 921                 if ( so->s_qtask == rtask )
 922                         so->s_qtask = NULL;
 923         }
 924         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 925         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 926         return rc;
 927 }
 928
 929 /* runqueue task for playing back queued responses */
 930 static void *
 931 syncprov_qtask( void *ctx, void *arg )
 932 {
 933         struct re_s *rtask = arg;
 934         syncops *so = rtask->arg;
 935         OperationBuffer opbuf;
 936         Operation *op;
 937         BackendDB be;
 938         int rc;
 939
 940         op = &opbuf.ob_op;
 941         *op = *so->s_op;
 942         op->o_hdr = &opbuf.ob_hdr;
 943         op->o_controls = opbuf.ob_controls;
 944         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 945
 946         *op->o_hdr = *so->s_op->o_hdr;
 947
 948         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 949         op->o_tmpmfuncs = &slap_sl_mfuncs;
 950         op->o_threadctx = ctx;
 951
 952         /* syncprov_qplay expects a fake db */
 953         be = *so->s_op->o_bd;
 954         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 955         op->o_bd = &be;
 956         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 957         op->o_callback = NULL;
 958
 959         rc = syncprov_qplay( op, rtask );
 960
 961         /* decrement use count... */
 962         syncprov_free_syncop( so );
 963
 964 #if 0   /* FIXME: connection_close isn't exported from slapd.
 965                  * should it be?
 966                  */
 967         if ( rc ) {
 968                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 969                 if ( connection_state_closing( op->o_conn )) {
 970                         connection_close( op->o_conn );
 971                 }
 972                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 973         }
 974 #endif
 975         return NULL;
 976 }
 977
 978 /* Start the task to play back queued psearch responses */
 979 static void
 980 syncprov_qstart( syncops *so )
 981 {
 982         int wake=0;
 983         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 984         if ( !so->s_qtask ) {
 985                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 986                         syncprov_qtask, so, "syncprov_qtask",
 987                         so->s_op->o_conn->c_peer_name.bv_val );
 988                 ++so->s_inuse;
 989                 wake = 1;
 990         } else {
 991                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 992                         !so->s_qtask->next_sched.tv_sec ) {
 993                         so->s_qtask->interval.tv_sec = 0;
 994                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 995                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 996                         ++so->s_inuse;
 997                         wake = 1;
 998                 }
 999         }
1000         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
1001         if ( wake )
1002                 slap_wake_listener();
1003 }
1004
1005 /* Queue a persistent search response */
1006 static int
1007 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1008 {
1009         syncres *sr;
1010         int sid, srsize;
1011
1012         /* Don't send changes back to their originator */
1013         sid = slap_parse_csn_sid( &opc->sctxcsn );
1014         if ( sid >= 0 && sid == so->s_sid )
1015                 return LDAP_SUCCESS;
1016
1017         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1018                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1019         if ( opc->sctxcsn.bv_len )
1020                 srsize += opc->sctxcsn.bv_len + 1;
1021         sr = ch_malloc( srsize );
1022         sr->s_next = NULL;
1023         sr->s_dn.bv_val = (char *)(sr + 1);
1024         sr->s_dn.bv_len = opc->sdn.bv_len;
1025         sr->s_mode = mode;
1026         sr->s_isreference = opc->sreference;
1027         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1028                  opc->sdn.bv_val ) + 1;
1029         sr->s_ndn.bv_len = opc->sndn.bv_len;
1030         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1031                  opc->sndn.bv_val ) + 1;
1032         sr->s_uuid.bv_len = opc->suuid.bv_len;
1033         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1034         if ( opc->sctxcsn.bv_len ) {
1035                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1036                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1037         } else {
1038                 sr->s_csn.bv_val = NULL;
1039         }
1040         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1041
1042         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1043         if ( !so->s_res ) {
1044                 so->s_res = sr;
1045         } else {
1046                 so->s_restail->s_next = sr;
1047         }
1048         so->s_restail = sr;
1049
1050         /* If the base of the psearch was modified, check it next time round */
1051         if ( so->s_flags & PS_WROTE_BASE ) {
1052                 so->s_flags ^= PS_WROTE_BASE;
1053                 so->s_flags |= PS_FIND_BASE;
1054         }
1055         if ( so->s_flags & PS_IS_DETACHED ) {
1056                 syncprov_qstart( so );
1057         }
1058         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1059         return LDAP_SUCCESS;
1060 }
1061
1062 static int
1063 syncprov_drop_psearch( syncops *so, int lock )
1064 {
1065         if ( so->s_flags & PS_IS_DETACHED ) {
1066                 if ( lock )
1067                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1068                 so->s_op->o_conn->c_n_ops_executing--;
1069                 so->s_op->o_conn->c_n_ops_completed++;
1070                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1071                         o_next );
1072                 if ( lock )
1073                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1074         }
1075         syncprov_free_syncop( so );
1076
1077         return 0;
1078 }
1079
1080 static int
1081 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1082 {
1083         slap_callback *sc = op->o_callback;
1084         op->o_callback = sc->sc_next;
1085         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1086         op->o_tmpfree( sc, op->o_tmpmemctx );
1087         return 0;
1088 }
1089
1090 static int
1091 syncprov_op_abandon( Operation *op, SlapReply *rs )
1092 {
1093         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1094         syncprov_info_t         *si = on->on_bi.bi_private;
1095         syncops *so, *soprev;
1096
1097         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1098         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1099                 soprev=so, so=so->s_next ) {
1100                 if ( so->s_op->o_connid == op->o_connid &&
1101                         so->s_op->o_msgid == op->orn_msgid ) {
1102                                 so->s_op->o_abandon = 1;
1103                                 soprev->s_next = so->s_next;
1104                                 break;
1105                 }
1106         }
1107         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1108         if ( so ) {
1109                 /* Is this really a Cancel exop? */
1110                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1111                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1112                         rs->sr_err = LDAP_CANCELLED;
1113                         send_ldap_result( so->s_op, rs );
1114                         if ( so->s_flags & PS_IS_DETACHED ) {
1115                                 slap_callback *cb;
1116                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1117                                 cb->sc_cleanup = syncprov_ab_cleanup;
1118                                 cb->sc_next = op->o_callback;
1119                                 cb->sc_private = so;
1120                                 return SLAP_CB_CONTINUE;
1121                         }
1122                 }
1123                 syncprov_drop_psearch( so, 0 );
1124         }
1125         return SLAP_CB_CONTINUE;
1126 }
1127
1128 /* Find which persistent searches are affected by this operation */
1129 static void
1130 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1131 {
1132         slap_overinst *on = opc->son;
1133         syncprov_info_t         *si = on->on_bi.bi_private;
1134
1135         fbase_cookie fc;
1136         syncops *ss, *sprev, *snext;
1137         Entry *e = NULL;
1138         Attribute *a;
1139         int rc;
1140         struct berval newdn;
1141         int freefdn = 0;
1142         BackendDB *b0 = op->o_bd, db;
1143
1144         fc.fdn = &op->o_req_ndn;
1145         /* compute new DN */
1146         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1147                 struct berval pdn;
1148                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1149                 else dnParent( fc.fdn, &pdn );
1150                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1151                 fc.fdn = &newdn;
1152                 freefdn = 1;
1153         }
1154         if ( op->o_tag != LDAP_REQ_ADD ) {
1155                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1156                         db = *op->o_bd;
1157                         op->o_bd = &db;
1158                 }
1159                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1160                 /* If we're sending responses now, make a copy and unlock the DB */
1161                 if ( e && !saveit ) {
1162                         Entry *e2 = entry_dup( e );
1163                         overlay_entry_release_ov( op, e, 0, on );
1164                         e = e2;
1165                 }
1166                 if ( rc ) {
1167                         op->o_bd = b0;
1168                         return;
1169                 }
1170         } else {
1171                 e = op->ora_e;
1172         }
1173
1174         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1175                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1176                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1177                 opc->sreference = is_entry_referral( e );
1178                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1179                 if ( a )
1180                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1181         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1182                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1183                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1184                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1185                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1186         }
1187
1188         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1189         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1190                 sprev = ss, ss=snext)
1191         {
1192                 Operation op2;
1193                 Opheader oh;
1194                 syncmatches *sm;
1195                 int found = 0;
1196
1197                 snext = ss->s_next;
1198                 if ( ss->s_op->o_abandon )
1199                         continue;
1200
1201                 /* validate base */
1202                 fc.fss = ss;
1203                 fc.fbase = 0;
1204                 fc.fscope = 0;
1205
1206                 /* If the base of the search is missing, signal a refresh */
1207                 rc = syncprov_findbase( op, &fc );
1208                 if ( rc != LDAP_SUCCESS ) {
1209                         SlapReply rs = {REP_RESULT};
1210                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1211                                 "search base has changed" );
1212                         sprev->s_next = snext;
1213                         syncprov_drop_psearch( ss, 1 );
1214                         ss = sprev;
1215                         continue;
1216                 }
1217
1218
1219                 /* If we're sending results now, look for this op in old matches */
1220                 if ( !saveit ) {
1221                         syncmatches *old;
1222
1223                         /* Did we modify the search base? */
1224                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1225                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1226                                 ss->s_flags |= PS_WROTE_BASE;
1227                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1228                         }
1229
1230                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1231                                 old=sm, sm=sm->sm_next ) {
1232                                 if ( sm->sm_op == ss ) {
1233                                         found = 1;
1234                                         old->sm_next = sm->sm_next;
1235                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1236                                         break;
1237                                 }
1238                         }
1239                 }
1240
1241                 if ( fc.fscope ) {
1242                         op2 = *ss->s_op;
1243                         oh = *op->o_hdr;
1244                         oh.oh_conn = ss->s_op->o_conn;
1245                         oh.oh_connid = ss->s_op->o_connid;
1246                         op2.o_hdr = &oh;
1247                         op2.o_extra = op->o_extra;
1248                 }
1249
1250                 /* check if current o_req_dn is in scope and matches filter */
1251                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1252                         LDAP_COMPARE_TRUE ) {
1253                         if ( saveit ) {
1254                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1255                                 sm->sm_next = opc->smatches;
1256                                 sm->sm_op = ss;
1257                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1258                                 ++ss->s_inuse;
1259                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1260                                 opc->smatches = sm;
1261                         } else {
1262                                 /* if found send UPDATE else send ADD */
1263                                 syncprov_qresp( opc, ss,
1264                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1265                         }
1266                 } else if ( !saveit && found ) {
1267                         /* send DELETE */
1268                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1269                 }
1270                 if ( !saveit && found ) {
1271                         /* Decrement s_inuse, was incremented when called
1272                          * with saveit == TRUE
1273                          */
1274                         syncprov_free_syncop( ss );
1275                 }
1276         }
1277         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1278
1279         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1280                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1281                         op->o_bd = &db;
1282                 }
1283                 overlay_entry_release_ov( op, e, 0, on );
1284                 op->o_bd = b0;
1285         }
1286         if ( freefdn ) {
1287                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1288         }
1289         op->o_bd = b0;
1290 }
1291
1292 static int
1293 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1294 {
1295         slap_callback *cb = op->o_callback;
1296         opcookie *opc = cb->sc_private;
1297         slap_overinst *on = opc->son;
1298         syncprov_info_t         *si = on->on_bi.bi_private;
1299         syncmatches *sm, *snext;
1300         modtarget *mt, mtdummy;
1301
1302         for (sm = opc->smatches; sm; sm=snext) {
1303                 snext = sm->sm_next;
1304                 syncprov_free_syncop( sm->sm_op );
1305                 op->o_tmpfree( sm, op->o_tmpmemctx );
1306         }
1307
1308         /* Remove op from lock table */
1309         mtdummy.mt_op = op;
1310         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1311         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1312         if ( mt ) {
1313                 modinst *mi = mt->mt_mods;
1314
1315                 /* If there are more, promote the next one */
1316                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1317                 if ( mi->mi_next ) {
1318                         mt->mt_mods = mi->mi_next;
1319                         mt->mt_op = mt->mt_mods->mi_op;
1320                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1321                 } else {
1322                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1323                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1324                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1325                         ch_free( mt );
1326                 }
1327         }
1328         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1329         if ( !BER_BVISNULL( &opc->suuid ))
1330                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1331         if ( !BER_BVISNULL( &opc->sndn ))
1332                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1333         if ( !BER_BVISNULL( &opc->sdn ))
1334                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1335         op->o_callback = cb->sc_next;
1336         op->o_tmpfree(cb, op->o_tmpmemctx);
1337
1338         return 0;
1339 }
1340
1341 static void
1342 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1343 {
1344         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1345         Modifications mod;
1346         Operation opm;
1347         SlapReply rsm = { 0 };
1348         slap_callback cb = {0};
1349         BackendDB be;
1350 #ifdef CHECK_CSN
1351         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1352
1353         int i;
1354         for ( i=0; i<si->si_numcsns; i++ ) {
1355                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1356         }
1357 #endif
1358         mod.sml_numvals = si->si_numcsns;
1359         mod.sml_values = si->si_ctxcsn;
1360         mod.sml_nvalues = NULL;
1361         mod.sml_desc = slap_schema.si_ad_contextCSN;
1362         mod.sml_op = LDAP_MOD_REPLACE;
1363         mod.sml_flags = SLAP_MOD_INTERNAL;
1364         mod.sml_next = NULL;
1365
1366         cb.sc_response = slap_null_cb;
1367         opm = *op;
1368         opm.o_tag = LDAP_REQ_MODIFY;
1369         opm.o_callback = &cb;
1370         opm.orm_modlist = &mod;
1371         opm.orm_no_opattrs = 1;
1372         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1373                 be = *on->on_info->oi_origdb;
1374                 opm.o_bd = &be;
1375         }
1376         opm.o_req_dn = opm.o_bd->be_suffix[0];
1377         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1378         opm.o_bd->bd_info = on->on_info->oi_orig;
1379         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1380         opm.o_no_schema_check = 1;
1381         opm.o_bd->be_modify( &opm, &rsm );
1382         if ( mod.sml_next != NULL ) {
1383                 slap_mods_free( mod.sml_next, 1 );
1384         }
1385 #ifdef CHECK_CSN
1386         for ( i=0; i<si->si_numcsns; i++ ) {
1387                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1388         }
1389 #endif
1390 }
1391
1392 static void
1393 syncprov_add_slog( Operation *op )
1394 {
1395         opcookie *opc = op->o_callback->sc_private;
1396         slap_overinst *on = opc->son;
1397         syncprov_info_t         *si = on->on_bi.bi_private;
1398         sessionlog *sl;
1399         slog_entry *se;
1400
1401         sl = si->si_logs;
1402         {
1403                 /* Allocate a record. UUIDs are not NUL-terminated. */
1404                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1405                         op->o_csn.bv_len + 1 );
1406                 se->se_next = NULL;
1407                 se->se_tag = op->o_tag;
1408
1409                 se->se_uuid.bv_val = (char *)(&se[1]);
1410                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1411                 se->se_uuid.bv_len = opc->suuid.bv_len;
1412
1413                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1414                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1415                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1416                 se->se_csn.bv_len = op->o_csn.bv_len;
1417                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1418
1419                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1420                 if ( sl->sl_head ) {
1421                         sl->sl_tail->se_next = se;
1422                 } else {
1423                         sl->sl_head = se;
1424                 }
1425                 sl->sl_tail = se;
1426                 sl->sl_num++;
1427                 while ( sl->sl_num > sl->sl_size ) {
1428                         se = sl->sl_head;
1429                         sl->sl_head = se->se_next;
1430                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1431                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1432                         ch_free( se );
1433                         sl->sl_num--;
1434                 }
1435                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1436         }
1437 }
1438
1439 /* Just set a flag if we found the matching entry */
1440 static int
1441 playlog_cb( Operation *op, SlapReply *rs )
1442 {
1443         if ( rs->sr_type == REP_SEARCH ) {
1444                 op->o_callback->sc_private = (void *)1;
1445         }
1446         return rs->sr_err;
1447 }
1448
1449 /* enter with sl->sl_mutex locked, release before returning */
1450 static void
1451 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1452         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1453 {
1454         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1455         slog_entry *se;
1456         int i, j, ndel, num, nmods, mmods;
1457         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1458         BerVarray uuids;
1459         struct berval delcsn[2];
1460
1461         if ( !sl->sl_num ) {
1462                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1463                 return;
1464         }
1465
1466         num = sl->sl_num;
1467         i = 0;
1468         nmods = 0;
1469
1470         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1471                 num * UUID_LEN, op->o_tmpmemctx );
1472         uuids[0].bv_val = (char *)(uuids + num + 1);
1473
1474         delcsn[0].bv_len = 0;
1475         delcsn[0].bv_val = cbuf;
1476         BER_BVZERO(&delcsn[1]);
1477
1478         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1479          * and everything else at the end. Do this first so we can
1480          * unlock the list mutex.
1481          */
1482         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1483                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1484         for ( se=sl->sl_head; se; se=se->se_next ) {
1485                 int k;
1486                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1487                 ndel = 1;
1488                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1489                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1490                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1491                                 break;
1492                         }
1493                 }
1494                 if ( ndel <= 0 ) {
1495                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1496                         continue;
1497                 }
1498                 ndel = 0;
1499                 for ( k=0; k<numcsns; k++ ) {
1500                         if ( se->se_sid == sids[k] ) {
1501                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1502                                 break;
1503                         }
1504                 }
1505                 if ( ndel > 0 ) {
1506                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1507                         break;
1508                 }
1509                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1510                         j = i;
1511                         i++;
1512                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1513                         delcsn[0].bv_len = se->se_csn.bv_len;
1514                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1515                 } else {
1516                         nmods++;
1517                         j = num - nmods;
1518                 }
1519                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1520                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1521                 uuids[j].bv_len = UUID_LEN;
1522         }
1523         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1524
1525         ndel = i;
1526
1527         /* Zero out unused slots */
1528         for ( i=ndel; i < num - nmods; i++ )
1529                 uuids[i].bv_len = 0;
1530
1531         /* Mods must be validated to see if they belong in this delete set.
1532          */
1533
1534         mmods = nmods;
1535         /* Strip any duplicates */
1536         for ( i=0; i<nmods; i++ ) {
1537                 for ( j=0; j<ndel; j++ ) {
1538                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1539                                 uuids[num - 1 - i].bv_len = 0;
1540                                 mmods --;
1541                                 break;
1542                         }
1543                 }
1544                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1545                 for ( j=0; j<i; j++ ) {
1546                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1547                                 uuids[num - 1 - i].bv_len = 0;
1548                                 mmods --;
1549                                 break;
1550                         }
1551                 }
1552         }
1553
1554         if ( mmods ) {
1555                 Operation fop;
1556                 SlapReply frs = { REP_RESULT };
1557                 int rc;
1558                 Filter mf, af;
1559                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1560                 slap_callback cb = {0};
1561
1562                 fop = *op;
1563
1564                 fop.o_sync_mode = 0;
1565                 fop.o_callback = &cb;
1566                 fop.ors_limit = NULL;
1567                 fop.ors_tlimit = SLAP_NO_LIMIT;
1568                 fop.ors_attrs = slap_anlist_all_attributes;
1569                 fop.ors_attrsonly = 0;
1570                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1571
1572                 af.f_choice = LDAP_FILTER_AND;
1573                 af.f_next = NULL;
1574                 af.f_and = &mf;
1575                 mf.f_choice = LDAP_FILTER_EQUALITY;
1576                 mf.f_ava = &eq;
1577                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1578                 mf.f_next = fop.ors_filter;
1579
1580                 fop.ors_filter = &af;
1581
1582                 cb.sc_response = playlog_cb;
1583                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1584
1585                 for ( i=ndel; i<num; i++ ) {
1586                         if ( uuids[i].bv_len == 0 ) continue;
1587
1588                         mf.f_av_value = uuids[i];
1589                         cb.sc_private = NULL;
1590                         fop.ors_slimit = 1;
1591                         frs.sr_nentries = 0;
1592                         rc = fop.o_bd->be_search( &fop, &frs );
1593
1594                         /* If entry was not found, add to delete list */
1595                         if ( !cb.sc_private ) {
1596                                 uuids[ndel++] = uuids[i];
1597                         }
1598                 }
1599                 fop.o_bd->bd_info = (BackendInfo *)on;
1600         }
1601         if ( ndel ) {
1602                 struct berval cookie;
1603
1604                 if ( delcsn[0].bv_len ) {
1605                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1606                                 srs->sr_state.sid );
1607
1608                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1609                 }
1610
1611                 uuids[ndel].bv_val = NULL;
1612                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1613                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1614                 if ( delcsn[0].bv_len ) {
1615                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1616                 }
1617         }
1618         op->o_tmpfree( uuids, op->o_tmpmemctx );
1619 }
1620
1621 static int
1622 syncprov_op_response( Operation *op, SlapReply *rs )
1623 {
1624         opcookie *opc = op->o_callback->sc_private;
1625         slap_overinst *on = opc->son;
1626         syncprov_info_t         *si = on->on_bi.bi_private;
1627         syncmatches *sm;
1628
1629         if ( rs->sr_err == LDAP_SUCCESS )
1630         {
1631                 struct berval maxcsn;
1632                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1633                 int do_check = 0, have_psearches, foundit;
1634
1635                 /* Update our context CSN */
1636                 cbuf[0] = '\0';
1637                 maxcsn.bv_val = cbuf;
1638                 maxcsn.bv_len = sizeof(cbuf);
1639                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1640                 slap_get_commit_csn( op, &maxcsn, &foundit );
1641                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1642                         /* syncrepl queues the CSN values in the db where
1643                          * it is configured , not where the changes are made.
1644                          * So look for a value in the glue db if we didn't
1645                          * find any in this db.
1646                          */
1647                         BackendDB *be = op->o_bd;
1648                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1649                         maxcsn.bv_val = cbuf;
1650                         maxcsn.bv_len = sizeof(cbuf);
1651                         slap_get_commit_csn( op, &maxcsn, &foundit );
1652                         op->o_bd = be;
1653                 }
1654                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1655                         int i, sid;
1656 #ifdef CHECK_CSN
1657                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1658                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1659 #endif
1660                         sid = slap_parse_csn_sid( &maxcsn );
1661                         for ( i=0; i<si->si_numcsns; i++ ) {
1662                                 if ( sid == si->si_sids[i] ) {
1663                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1664                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1665                                         }
1666                                         break;
1667                                 }
1668                         }
1669                         /* It's a new SID for us */
1670                         if ( i == si->si_numcsns ) {
1671                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1672                                 si->si_numcsns++;
1673                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1674                                         sizeof(int));
1675                                 si->si_sids[i] = sid;
1676                         }
1677                 } else if ( !foundit ) {
1678                         /* internal ops that aren't meant to be replicated */
1679                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1680                         return SLAP_CB_CONTINUE;
1681                 }
1682
1683                 /* Don't do any processing for consumer contextCSN updates */
1684                 if ( op->o_dont_replicate ) {
1685                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1686                         return SLAP_CB_CONTINUE;
1687                 }
1688
1689                 si->si_numops++;
1690                 if ( si->si_chkops || si->si_chktime ) {
1691                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1692                                 do_check = 1;
1693                                 si->si_numops = 0;
1694                         }
1695                         if ( si->si_chktime &&
1696                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1697                                 if ( si->si_chklast ) {
1698                                         do_check = 1;
1699                                         si->si_chklast = op->o_time;
1700                                 } else {
1701                                         si->si_chklast = 1;
1702                                 }
1703                         }
1704                 }
1705                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1706
1707                 if ( do_check ) {
1708                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1709                         syncprov_checkpoint( op, rs, on );
1710                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1711                 }
1712
1713                 /* only update consumer ctx if this is the greatest csn */
1714                 if ( bvmatch( &maxcsn, &op->o_csn )) {
1715                         opc->sctxcsn = maxcsn;
1716                 }
1717
1718                 /* Handle any persistent searches */
1719                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1720                 have_psearches = ( si->si_ops != NULL );
1721                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1722                 if ( have_psearches ) {
1723                         switch(op->o_tag) {
1724                         case LDAP_REQ_ADD:
1725                         case LDAP_REQ_MODIFY:
1726                         case LDAP_REQ_MODRDN:
1727                         case LDAP_REQ_EXTENDED:
1728                                 syncprov_matchops( op, opc, 0 );
1729                                 break;
1730                         case LDAP_REQ_DELETE:
1731                                 /* for each match in opc->smatches:
1732                                  *   send DELETE msg
1733                                  */
1734                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1735                                         if ( sm->sm_op->s_op->o_abandon )
1736                                                 continue;
1737                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1738                                 }
1739                                 break;
1740                         }
1741                 }
1742
1743                 /* Add any log records */
1744                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1745                         syncprov_add_slog( op );
1746                 }
1747
1748         }
1749         return SLAP_CB_CONTINUE;
1750 }
1751
1752 /* We don't use a subentry to store the context CSN any more.
1753  * We expose the current context CSN as an operational attribute
1754  * of the suffix entry.
1755  */
1756 static int
1757 syncprov_op_compare( Operation *op, SlapReply *rs )
1758 {
1759         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1760         syncprov_info_t         *si = on->on_bi.bi_private;
1761         int rc = SLAP_CB_CONTINUE;
1762
1763         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1764                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1765         {
1766                 Entry e = {0};
1767                 Attribute a = {0};
1768
1769                 e.e_name = op->o_bd->be_suffix[0];
1770                 e.e_nname = op->o_bd->be_nsuffix[0];
1771                 e.e_attrs = &a;
1772
1773                 a.a_desc = slap_schema.si_ad_contextCSN;
1774
1775                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1776
1777                 a.a_vals = si->si_ctxcsn;
1778                 a.a_nvals = a.a_vals;
1779                 a.a_numvals = si->si_numcsns;
1780
1781                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1782                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1783                 if ( ! rs->sr_err ) {
1784                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1785                         goto return_results;
1786                 }
1787
1788                 if ( get_assert( op ) &&
1789                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1790                 {
1791                         rs->sr_err = LDAP_ASSERTION_FAILED;
1792                         goto return_results;
1793                 }
1794
1795
1796                 rs->sr_err = LDAP_COMPARE_FALSE;
1797
1798                 if ( attr_valfind( &a,
1799                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1800                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1801                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1802                 {
1803                         rs->sr_err = LDAP_COMPARE_TRUE;
1804                 }
1805
1806 return_results:;
1807
1808                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1809
1810                 send_ldap_result( op, rs );
1811
1812                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1813                         rs->sr_err = LDAP_SUCCESS;
1814                 }
1815                 rc = rs->sr_err;
1816         }
1817
1818         return rc;
1819 }
1820
1821 static int
1822 syncprov_op_mod( Operation *op, SlapReply *rs )
1823 {
1824         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1825         syncprov_info_t         *si = on->on_bi.bi_private;
1826         slap_callback *cb;
1827         opcookie *opc;
1828         int have_psearches, cbsize;
1829
1830         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1831         have_psearches = ( si->si_ops != NULL );
1832         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1833
1834         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1835                 (have_psearches ? sizeof(modinst) : 0 );
1836
1837         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1838         opc = (opcookie *)(cb+1);
1839         opc->son = on;
1840         cb->sc_response = syncprov_op_response;
1841         cb->sc_cleanup = syncprov_op_cleanup;
1842         cb->sc_private = opc;
1843         cb->sc_next = op->o_callback;
1844         op->o_callback = cb;
1845
1846         /* If there are active persistent searches, lock this operation.
1847          * See seqmod.c for the locking logic on its own.
1848          */
1849         if ( have_psearches ) {
1850                 modtarget *mt, mtdummy;
1851                 modinst *mi;
1852
1853                 mi = (modinst *)(opc+1);
1854                 mi->mi_op = op;
1855
1856                 /* See if we're already modifying this entry... */
1857                 mtdummy.mt_op = op;
1858                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1859                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1860                 if ( mt ) {
1861                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1862                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1863                         mt->mt_tail->mi_next = mi;
1864                         mt->mt_tail = mi;
1865                         /* wait for this op to get to head of list */
1866                         while ( mt->mt_mods != mi ) {
1867                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1868                                 /* FIXME: if dynamic config can delete overlays or
1869                                  * databases we'll have to check for cleanup here.
1870                                  * Currently it's not an issue because there are
1871                                  * no dynamic config deletes...
1872                                  */
1873                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1874                                         ldap_pvt_thread_yield();
1875                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1876
1877                                 /* clean up if the caller is giving up */
1878                                 if ( op->o_abandon ) {
1879                                         modinst *m2;
1880                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1881                                                 m2 = m2->mi_next );
1882                                         m2->mi_next = mi->mi_next;
1883                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1884                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1885                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1886                                         return SLAPD_ABANDON;
1887                                 }
1888                         }
1889                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1890                 } else {
1891                         /* Record that we're modifying this entry now */
1892                         mt = ch_malloc( sizeof(modtarget) );
1893                         mt->mt_mods = mi;
1894                         mt->mt_tail = mi;
1895                         mt->mt_op = mi->mi_op;
1896                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1897                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1898                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1899                 }
1900         }
1901
1902         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1903                 syncprov_matchops( op, opc, 1 );
1904
1905         return SLAP_CB_CONTINUE;
1906 }
1907
1908 static int
1909 syncprov_op_extended( Operation *op, SlapReply *rs )
1910 {
1911         if ( exop_is_write( op ))
1912                 return syncprov_op_mod( op, rs );
1913
1914         return SLAP_CB_CONTINUE;
1915 }
1916
1917 typedef struct searchstate {
1918         slap_overinst *ss_on;
1919         syncops *ss_so;
1920         BerVarray ss_ctxcsn;
1921         int *ss_sids;
1922         int ss_numcsns;
1923 #define SS_PRESENT      0x01
1924 #define SS_CHANGED      0x02
1925         int ss_flags;
1926 } searchstate;
1927
1928 static int
1929 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1930 {
1931         if ( rs->sr_ctrls ) {
1932                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1933                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1934                 rs->sr_ctrls = NULL;
1935         }
1936         return 0;
1937 }
1938
1939 typedef struct SyncOperationBuffer {
1940         Operation               sob_op;
1941         Opheader                sob_hdr;
1942         OpExtra                 sob_oe;
1943         AttributeName   sob_extra;      /* not always present */
1944         /* Further data allocated here */
1945 } SyncOperationBuffer;
1946
1947 static void
1948 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1949 {
1950         SyncOperationBuffer *sopbuf2;
1951         Operation *op2;
1952         int i, alen = 0;
1953         size_t size;
1954         char *ptr;
1955         GroupAssertion *g1, *g2;
1956
1957         /* count the search attrs */
1958         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1959                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1960         }
1961         /* Make a new copy of the operation */
1962         size = offsetof( SyncOperationBuffer, sob_extra ) +
1963                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1964                 op->o_req_dn.bv_len + 1 +
1965                 op->o_req_ndn.bv_len + 1 +
1966                 op->o_ndn.bv_len + 1 +
1967                 so->s_filterstr.bv_len + 1;
1968         sopbuf2 = ch_calloc( 1, size );
1969         op2 = &sopbuf2->sob_op;
1970         op2->o_hdr = &sopbuf2->sob_hdr;
1971         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1972
1973         /* Copy the fields we care about explicitly, leave the rest alone */
1974         *op2->o_hdr = *op->o_hdr;
1975         op2->o_tag = op->o_tag;
1976         op2->o_time = op->o_time;
1977         op2->o_bd = on->on_info->oi_origdb;
1978         op2->o_request = op->o_request;
1979         op2->o_managedsait = op->o_managedsait;
1980         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
1981         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
1982
1983         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1984         if ( i ) {
1985                 op2->ors_attrs = (AttributeName *) ptr;
1986                 ptr = (char *) &op2->ors_attrs[i+1];
1987                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1988                         op2->ors_attrs[i] = op->ors_attrs[i];
1989                         op2->ors_attrs[i].an_name.bv_val = ptr;
1990                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1991                 }
1992                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1993         }
1994
1995         op2->o_authz = op->o_authz;
1996         op2->o_ndn.bv_val = ptr;
1997         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1998         op2->o_dn = op2->o_ndn;
1999         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2000         op2->o_req_dn.bv_val = ptr;
2001         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2002         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2003         op2->o_req_ndn.bv_val = ptr;
2004         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2005         op2->ors_filterstr.bv_val = ptr;
2006         strcpy( ptr, so->s_filterstr.bv_val );
2007         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2008
2009         /* Skip the AND/GE clause that we stuck on in front */
2010         if ( so->s_flags & PS_FIX_FILTER ) {
2011                 op2->ors_filter = op->ors_filter->f_and->f_next;
2012                 so->s_flags ^= PS_FIX_FILTER;
2013         } else {
2014                 op2->ors_filter = op->ors_filter;
2015         }
2016         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2017         so->s_op = op2;
2018
2019         /* Copy any cached group ACLs individually */
2020         op2->o_groups = NULL;
2021         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2022                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2023                 *g2 = *g1;
2024                 strcpy( g2->ga_ndn, g1->ga_ndn );
2025                 g2->ga_next = op2->o_groups;
2026                 op2->o_groups = g2;
2027         }
2028         /* Don't allow any further group caching */
2029         op2->o_do_not_cache = 1;
2030
2031         /* Add op2 to conn so abandon will find us */
2032         op->o_conn->c_n_ops_executing++;
2033         op->o_conn->c_n_ops_completed--;
2034         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2035         so->s_flags |= PS_IS_DETACHED;
2036
2037         /* Prevent anyone else from trying to send a result for this op */
2038         op->o_abandon = 1;
2039 }
2040
2041 static int
2042 syncprov_search_response( Operation *op, SlapReply *rs )
2043 {
2044         searchstate *ss = op->o_callback->sc_private;
2045         slap_overinst *on = ss->ss_on;
2046         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2047         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2048
2049         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2050                 Attribute *a;
2051                 /* If we got a referral without a referral object, there's
2052                  * something missing that we cannot replicate. Just ignore it.
2053                  * The consumer will abort because we didn't send the expected
2054                  * control.
2055                  */
2056                 if ( !rs->sr_entry ) {
2057                         assert( rs->sr_entry != NULL );
2058                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2059                         return SLAP_CB_CONTINUE;
2060                 }
2061                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2062                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2063                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2064                 }
2065                 if ( a ) {
2066                         int i, sid;
2067                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2068
2069                         /* Don't send changed entries back to the originator */
2070                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2071                                 Debug( LDAP_DEBUG_SYNC,
2072                                         "Entry %s changed by peer, ignored\n",
2073                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2074                                 return LDAP_SUCCESS;
2075                         }
2076
2077                         /* If not a persistent search */
2078                         if ( !ss->ss_so ) {
2079                                 /* Make sure entry is less than the snapshot'd contextCSN */
2080                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2081                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2082                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2083                                                 Debug( LDAP_DEBUG_SYNC,
2084                                                         "Entry %s CSN %s greater than snapshot %s\n",
2085                                                         rs->sr_entry->e_name.bv_val,
2086                                                         a->a_nvals[0].bv_val,
2087                                                         ss->ss_ctxcsn[i].bv_val );
2088                                                 return LDAP_SUCCESS;
2089                                         }
2090                                 }
2091                         }
2092
2093                         /* Don't send old entries twice */
2094                         if ( srs->sr_state.ctxcsn ) {
2095                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2096                                         if ( sid == srs->sr_state.sids[i] &&
2097                                                 ber_bvcmp( &a->a_nvals[0],
2098                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2099                                                 Debug( LDAP_DEBUG_SYNC,
2100                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2101                                                         rs->sr_entry->e_name.bv_val,
2102                                                         a->a_nvals[0].bv_val,
2103                                                         srs->sr_state.ctxcsn[i].bv_val );
2104                                                 return LDAP_SUCCESS;
2105                                         }
2106                                 }
2107                         }
2108                 }
2109                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2110                         op->o_tmpmemctx );
2111                 rs->sr_ctrls[1] = NULL;
2112                 /* If we're in delta-sync mode, always send a cookie */
2113                 if ( si->si_nopres && si->si_usehint && a ) {
2114                         struct berval cookie;
2115                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2116                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2117                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2118                 } else {
2119                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2120                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2121                 }
2122         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2123                 struct berval cookie;
2124
2125                 if ( ss->ss_flags & SS_CHANGED ) {
2126                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2127                                 srs->sr_state.rid, srs->sr_state.sid );
2128
2129                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2130                 }
2131
2132                 /* Is this a regular refresh?
2133                  * Note: refresh never gets here if there were no changes
2134                  */
2135                 if ( !ss->ss_so ) {
2136                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2137                                 op->o_tmpmemctx );
2138                         rs->sr_ctrls[1] = NULL;
2139                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2140                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2141                                         LDAP_SYNC_REFRESH_DELETES );
2142                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2143                 } else {
2144                 /* It's RefreshAndPersist, transition to Persist phase */
2145                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2146                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2147                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2148                                 1, NULL, 0 );
2149                         if ( ss->ss_flags & SS_CHANGED )
2150                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2151
2152                         /* Detach this Op from frontend control */
2153                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2154
2155                         /* But not if this connection was closed along the way */
2156                         if ( op->o_abandon ) {
2157                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2158                                 /* syncprov_ab_cleanup will free this syncop */
2159                                 return SLAPD_ABANDON;
2160
2161                         } else {
2162                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2163                                 /* Turn off the refreshing flag */
2164                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2165
2166                                 syncprov_detach_op( op, ss->ss_so, on );
2167
2168                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2169
2170                                 /* If there are queued responses, fire them off */
2171                                 if ( ss->ss_so->s_res )
2172                                         syncprov_qstart( ss->ss_so );
2173                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2174                         }
2175
2176                         return LDAP_SUCCESS;
2177                 }
2178         }
2179
2180         return SLAP_CB_CONTINUE;
2181 }
2182
2183 static int
2184 syncprov_op_search( Operation *op, SlapReply *rs )
2185 {
2186         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2187         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2188         slap_callback   *cb;
2189         int gotstate = 0, changed = 0, do_present = 0;
2190         syncops *sop = NULL;
2191         searchstate *ss;
2192         sync_control *srs;
2193         BerVarray ctxcsn;
2194         int i, *sids, numcsns;
2195         struct berval mincsn;
2196
2197         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2198
2199         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2200                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2201                 return rs->sr_err;
2202         }
2203
2204         srs = op->o_controls[slap_cids.sc_LDAPsync];
2205
2206         /* If this is a persistent search, set it up right away */
2207         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2208                 syncops so = {0};
2209                 fbase_cookie fc;
2210                 opcookie opc;
2211                 slap_callback sc;
2212
2213                 fc.fss = &so;
2214                 fc.fbase = 0;
2215                 so.s_eid = NOID;
2216                 so.s_op = op;
2217                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2218                 /* syncprov_findbase expects to be called as a callback... */
2219                 sc.sc_private = &opc;
2220                 opc.son = on;
2221                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2222                 cb = op->o_callback;
2223                 op->o_callback = &sc;
2224                 rs->sr_err = syncprov_findbase( op, &fc );
2225                 op->o_callback = cb;
2226                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2227
2228                 if ( rs->sr_err != LDAP_SUCCESS ) {
2229                         send_ldap_result( op, rs );
2230                         return rs->sr_err;
2231                 }
2232                 sop = ch_malloc( sizeof( syncops ));
2233                 *sop = so;
2234                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2235                 sop->s_rid = srs->sr_state.rid;
2236                 sop->s_sid = srs->sr_state.sid;
2237                 sop->s_inuse = 1;
2238
2239                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2240                 sop->s_next = si->si_ops;
2241                 si->si_ops = sop;
2242                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2243         }
2244
2245         /* snapshot the ctxcsn */
2246         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2247         numcsns = si->si_numcsns;
2248         if ( numcsns ) {
2249                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2250                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2251                 for ( i=0; i<numcsns; i++ )
2252                         sids[i] = si->si_sids[i];
2253         } else {
2254                 ctxcsn = NULL;
2255                 sids = NULL;
2256         }
2257         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2258
2259         /* If we have a cookie, handle the PRESENT lookups */
2260         if ( srs->sr_state.ctxcsn ) {
2261                 sessionlog *sl;
2262                 int i, j;
2263
2264                 /* If we don't have any CSN of our own yet, pretend nothing
2265                  * has changed.
2266                  */
2267                 if ( !numcsns )
2268                         goto no_change;
2269
2270                 if ( !si->si_nopres )
2271                         do_present = SS_PRESENT;
2272
2273                 /* If there are SIDs we don't recognize in the cookie, drop them */
2274                 for (i=0; i<srs->sr_state.numcsns; ) {
2275                         for (j=0; j<numcsns; j++) {
2276                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2277                                         break;
2278                                 }
2279                         }
2280                         /* not found */
2281                         if ( j == numcsns ) {
2282                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2283                                 j = srs->sr_state.numcsns - 1;
2284                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2285                                 tmp.bv_len = 0;
2286                                 srs->sr_state.ctxcsn[j] = tmp;
2287                                 srs->sr_state.numcsns = j;
2288                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2289                                 continue;
2290                         }
2291                         i++;
2292                 }
2293
2294                 /* Find the smallest CSN */
2295                 mincsn = srs->sr_state.ctxcsn[0];
2296                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2297                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2298                                 mincsn = srs->sr_state.ctxcsn[i];
2299                 }
2300
2301                 /* If nothing has changed, shortcut it */
2302                 if ( srs->sr_state.numcsns == numcsns ) {
2303                         int i, j;
2304                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2305                                 for ( j=0; j<numcsns; j++ ) {
2306                                         if ( srs->sr_state.sids[i] != sids[j] )
2307                                                 continue;
2308                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2309                                                 changed = SS_CHANGED;
2310                                         break;
2311                                 }
2312                                 if ( changed )
2313                                         break;
2314                         }
2315                         if ( !changed ) {
2316                                 do_present = 0;
2317 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2318                                         LDAPControl     *ctrls[2];
2319
2320                                         ctrls[0] = NULL;
2321                                         ctrls[1] = NULL;
2322                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2323                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2324                                         rs->sr_ctrls = ctrls;
2325                                         rs->sr_err = LDAP_SUCCESS;
2326                                         send_ldap_result( op, rs );
2327                                         rs->sr_ctrls = NULL;
2328                                         return rs->sr_err;
2329                                 }
2330                                 goto shortcut;
2331                         }
2332                 } else {
2333                         /* consumer doesn't have the right number of CSNs */
2334                         changed = SS_CHANGED;
2335                 }
2336                 /* Do we have a sessionlog for this search? */
2337                 sl=si->si_logs;
2338                 if ( sl ) {
2339                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2340                         /* Are there any log entries, and is the consumer state
2341                          * present in the session log?
2342                          */
2343                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2344                                 do_present = 0;
2345                                 /* mutex is unlocked in playlog */
2346                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2347                         } else {
2348                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2349                         }
2350                 }
2351                 /* Is the CSN still present in the database? */
2352                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2353                         /* No, so a reload is required */
2354                         /* the 2.2 consumer doesn't send this hint */
2355                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2356                                 if ( ctxcsn )
2357                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2358                                 if ( sids )
2359                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2360                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2361                                 return rs->sr_err;
2362                         }
2363                         if ( srs->sr_state.ctxcsn ) {
2364                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2365                                 srs->sr_state.ctxcsn = NULL;
2366                         }
2367                         if ( srs->sr_state.sids ) {
2368                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2369                                 srs->sr_state.sids = NULL;
2370                         }
2371                         srs->sr_state.numcsns = 0;
2372                 } else {
2373                         gotstate = 1;
2374                         /* If changed and doing Present lookup, send Present UUIDs */
2375                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2376                                 LDAP_SUCCESS ) {
2377                                 if ( ctxcsn )
2378                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2379                                 if ( sids )
2380                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2381                                 send_ldap_result( op, rs );
2382                                 return rs->sr_err;
2383                         }
2384                 }
2385         } else {
2386                 /* No consumer state, assume something has changed */
2387                 changed = SS_CHANGED;
2388         }
2389
2390 shortcut:
2391         /* Append CSN range to search filter, save original filter
2392          * for persistent search evaluation
2393          */
2394         if ( sop ) {
2395                 sop->s_filterstr= op->ors_filterstr;
2396         }
2397
2398         /* If something changed, find the changes */
2399         if ( gotstate && changed ) {
2400                 Filter *fand, *fava;
2401
2402                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2403                 fand->f_choice = LDAP_FILTER_AND;
2404                 fand->f_next = NULL;
2405                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2406                 fand->f_and = fava;
2407                 fava->f_choice = LDAP_FILTER_GE;
2408                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2409                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2410 #ifdef LDAP_COMP_MATCH
2411                 fava->f_ava->aa_cf = NULL;
2412 #endif
2413                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2414                 fava->f_next = op->ors_filter;
2415                 op->ors_filter = fand;
2416                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2417                 if ( sop )
2418                         sop->s_flags |= PS_FIX_FILTER;
2419         }
2420
2421         /* Let our callback add needed info to returned entries */
2422         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2423         ss = (searchstate *)(cb+1);
2424         ss->ss_on = on;
2425         ss->ss_so = sop;
2426         ss->ss_flags = do_present | changed;
2427         ss->ss_ctxcsn = ctxcsn;
2428         ss->ss_numcsns = numcsns;
2429         ss->ss_sids = sids;
2430         cb->sc_response = syncprov_search_response;
2431         cb->sc_cleanup = syncprov_search_cleanup;
2432         cb->sc_private = ss;
2433         cb->sc_next = op->o_callback;
2434         op->o_callback = cb;
2435
2436         /* If this is a persistent search and no changes were reported during
2437          * the refresh phase, just invoke the response callback to transition
2438          * us into persist phase
2439          */
2440         if ( !changed ) {
2441                 rs->sr_err = LDAP_SUCCESS;
2442                 rs->sr_nentries = 0;
2443                 send_ldap_result( op, rs );
2444                 return rs->sr_err;
2445         }
2446         return SLAP_CB_CONTINUE;
2447 }
2448
2449 static int
2450 syncprov_operational(
2451         Operation *op,
2452         SlapReply *rs )
2453 {
2454         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2455         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2456
2457         /* This prevents generating unnecessarily; frontend will strip
2458          * any statically stored copy.
2459          */
2460         if ( op->o_sync != SLAP_CONTROL_NONE )
2461                 return SLAP_CB_CONTINUE;
2462
2463         if ( rs->sr_entry &&
2464                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2465
2466                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2467                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2468                         Attribute *a, **ap = NULL;
2469
2470                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2471                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2472                                         break;
2473                         }
2474
2475                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2476                         if ( si->si_ctxcsn ) {
2477                                 if ( !a ) {
2478                                         for ( ap = &rs->sr_operational_attrs; *ap;
2479                                                 ap=&(*ap)->a_next );
2480
2481                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2482                                         *ap = a;
2483                                 }
2484
2485                                 if ( !ap ) {
2486                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2487                                                 Entry *e = entry_dup( rs->sr_entry );
2488                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2489                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2490                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2491                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2492                                                         entry_free( rs->sr_entry );
2493                                                 }
2494                                                 rs->sr_entry = e;
2495                                                 rs->sr_flags |=
2496                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2497                                                 a = attr_find( rs->sr_entry->e_attrs,
2498                                                         slap_schema.si_ad_contextCSN );
2499                                         }
2500                                         if ( a->a_nvals != a->a_vals ) {
2501                                                 ber_bvarray_free( a->a_nvals );
2502                                         }
2503                                         a->a_nvals = NULL;
2504                                         ber_bvarray_free( a->a_vals );
2505                                         a->a_vals = NULL;
2506                                         a->a_numvals = 0;
2507                                 }
2508                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2509                         }
2510                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2511                 }
2512         }
2513         return SLAP_CB_CONTINUE;
2514 }
2515
2516 enum {
2517         SP_CHKPT = 1,
2518         SP_SESSL,
2519         SP_NOPRES,
2520         SP_USEHINT
2521 };
2522
2523 static ConfigDriver sp_cf_gen;
2524
2525 static ConfigTable spcfg[] = {
2526         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2527                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2528                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2529                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2530         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2531                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2532                         "DESC 'Session log size in ops' "
2533                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2534         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2535                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2536                         "DESC 'Omit Present phase processing' "
2537                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2538         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2539                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2540                         "DESC 'Observe Reload Hint in Request control' "
2541                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2542         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2543 };
2544
2545 static ConfigOCs spocs[] = {
2546         { "( OLcfgOvOc:1.1 "
2547                 "NAME 'olcSyncProvConfig' "
2548                 "DESC 'SyncRepl Provider configuration' "
2549                 "SUP olcOverlayConfig "
2550                 "MAY ( olcSpCheckpoint "
2551                         "$ olcSpSessionlog "
2552                         "$ olcSpNoPresent "
2553                         "$ olcSpReloadHint "
2554                 ") )",
2555                         Cft_Overlay, spcfg },
2556         { NULL, 0, NULL }
2557 };
2558
2559 static int
2560 sp_cf_gen(ConfigArgs *c)
2561 {
2562         slap_overinst           *on = (slap_overinst *)c->bi;
2563         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2564         int rc = 0;
2565
2566         if ( c->op == SLAP_CONFIG_EMIT ) {
2567                 switch ( c->type ) {
2568                 case SP_CHKPT:
2569                         if ( si->si_chkops || si->si_chktime ) {
2570                                 struct berval bv;
2571                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2572                                         "%d %d", si->si_chkops, si->si_chktime );
2573                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2574                                         rc = 1;
2575                                 } else {
2576                                         bv.bv_val = c->cr_msg;
2577                                         value_add_one( &c->rvalue_vals, &bv );
2578                                 }
2579                         } else {
2580                                 rc = 1;
2581                         }
2582                         break;
2583                 case SP_SESSL:
2584                         if ( si->si_logs ) {
2585                                 c->value_int = si->si_logs->sl_size;
2586                         } else {
2587                                 rc = 1;
2588                         }
2589                         break;
2590                 case SP_NOPRES:
2591                         if ( si->si_nopres ) {
2592                                 c->value_int = 1;
2593                         } else {
2594                                 rc = 1;
2595                         }
2596                         break;
2597                 case SP_USEHINT:
2598                         if ( si->si_usehint ) {
2599                                 c->value_int = 1;
2600                         } else {
2601                                 rc = 1;
2602                         }
2603                         break;
2604                 }
2605                 return rc;
2606         } else if ( c->op == LDAP_MOD_DELETE ) {
2607                 switch ( c->type ) {
2608                 case SP_CHKPT:
2609                         si->si_chkops = 0;
2610                         si->si_chktime = 0;
2611                         break;
2612                 case SP_SESSL:
2613                         if ( si->si_logs )
2614                                 si->si_logs->sl_size = 0;
2615                         else
2616                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2617                         break;
2618                 case SP_NOPRES:
2619                         if ( si->si_nopres )
2620                                 si->si_nopres = 0;
2621                         else
2622                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2623                         break;
2624                 case SP_USEHINT:
2625                         if ( si->si_usehint )
2626                                 si->si_usehint = 0;
2627                         else
2628                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2629                         break;
2630                 }
2631                 return rc;
2632         }
2633         switch ( c->type ) {
2634         case SP_CHKPT:
2635                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2636                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2637                                 c->argv[0], c->argv[1] );
2638                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2639                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2640                         return ARG_BAD_CONF;
2641                 }
2642                 if ( si->si_chkops <= 0 ) {
2643                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2644                                 c->argv[0], si->si_chkops );
2645                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2646                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2647                         return ARG_BAD_CONF;
2648                 }
2649                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2650                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2651                                 c->argv[0], c->argv[1] );
2652                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2653                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2654                         return ARG_BAD_CONF;
2655                 }
2656                 if ( si->si_chktime <= 0 ) {
2657                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2658                                 c->argv[0], si->si_chkops );
2659                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2660                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2661                         return ARG_BAD_CONF;
2662                 }
2663                 si->si_chktime *= 60;
2664                 break;
2665         case SP_SESSL: {
2666                 sessionlog *sl;
2667                 int size = c->value_int;
2668
2669                 if ( size < 0 ) {
2670                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2671                                 c->argv[0], size );
2672                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2673                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2674                         return ARG_BAD_CONF;
2675                 }
2676                 sl = si->si_logs;
2677                 if ( !sl ) {
2678                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2679                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2680                         sl->sl_mincsn.bv_len = 0;
2681                         sl->sl_num = 0;
2682                         sl->sl_head = sl->sl_tail = NULL;
2683                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2684                         si->si_logs = sl;
2685                 }
2686                 sl->sl_size = size;
2687                 }
2688                 break;
2689         case SP_NOPRES:
2690                 si->si_nopres = c->value_int;
2691                 break;
2692         case SP_USEHINT:
2693                 si->si_usehint = c->value_int;
2694                 break;
2695         }
2696         return rc;
2697 }
2698
2699 /* ITS#3456 we cannot run this search on the main thread, must use a
2700  * child thread in order to insure we have a big enough stack.
2701  */
2702 static void *
2703 syncprov_db_otask(
2704         void *ptr
2705 )
2706 {
2707         syncprov_findcsn( ptr, FIND_MAXCSN );
2708         return NULL;
2709 }
2710
2711 /* Read any existing contextCSN from the underlying db.
2712  * Then search for any entries newer than that. If no value exists,
2713  * just generate it. Cache whatever result.
2714  */
2715 static int
2716 syncprov_db_open(
2717         BackendDB *be,
2718         ConfigReply *cr
2719 )
2720 {
2721         slap_overinst   *on = (slap_overinst *) be->bd_info;
2722         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2723
2724         Connection conn = { 0 };
2725         OperationBuffer opbuf;
2726         Operation *op;
2727         Entry *e = NULL;
2728         Attribute *a;
2729         int rc;
2730         void *thrctx = NULL;
2731
2732         if ( !SLAP_LASTMOD( be )) {
2733                 Debug( LDAP_DEBUG_ANY,
2734                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2735                 return -1;
2736         }
2737
2738         if ( slapMode & SLAP_TOOL_MODE ) {
2739                 return 0;
2740         }
2741
2742         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2743         if ( rc ) {
2744                 return rc;
2745         }
2746
2747         thrctx = ldap_pvt_thread_pool_context();
2748         connection_fake_init( &conn, &opbuf, thrctx );
2749         op = &opbuf.ob_op;
2750         op->o_bd = be;
2751         op->o_dn = be->be_rootdn;
2752         op->o_ndn = be->be_rootndn;
2753
2754         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2755                 slap_schema.si_ad_contextCSN, 0, &e, on );
2756
2757         if ( e ) {
2758                 ldap_pvt_thread_t tid;
2759
2760                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2761                 if ( a ) {
2762                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2763                         si->si_numcsns = a->a_numvals;
2764                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2765                 }
2766                 overlay_entry_release_ov( op, e, 0, on );
2767                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2768                         op->o_req_dn = be->be_suffix[0];
2769                         op->o_req_ndn = be->be_nsuffix[0];
2770                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2771                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2772                         ldap_pvt_thread_join( tid, NULL );
2773                 }
2774         }
2775
2776         /* Didn't find a contextCSN, should we generate one? */
2777         if ( !si->si_ctxcsn ) {
2778                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2779                 struct berval csn;
2780
2781                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2782                 /* If we're also a consumer, then don't generate anything.
2783                  * Wait for our provider to send it to us, or for a local
2784                  * modify if we have multimaster.
2785                  */
2786                         goto out;
2787                 }
2788                 csn.bv_val = csnbuf;
2789                 csn.bv_len = sizeof( csnbuf );
2790                 slap_get_csn( op, &csn, 0 );
2791                 value_add_one( &si->si_ctxcsn, &csn );
2792                 si->si_numcsns = 1;
2793                 si->si_sids = ch_malloc( sizeof(int) );
2794                 si->si_sids[0] = slap_serverID;
2795
2796                 /* make sure we do a checkpoint on close */
2797                 si->si_numops++;
2798         }
2799
2800 out:
2801         op->o_bd->bd_info = (BackendInfo *)on;
2802         return 0;
2803 }
2804
2805 /* Write the current contextCSN into the underlying db.
2806  */
2807 static int
2808 syncprov_db_close(
2809         BackendDB *be,
2810         ConfigReply *cr
2811 )
2812 {
2813     slap_overinst   *on = (slap_overinst *) be->bd_info;
2814     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2815
2816         if ( slapMode & SLAP_TOOL_MODE ) {
2817                 return 0;
2818         }
2819         if ( si->si_numops ) {
2820                 Connection conn = {0};
2821                 OperationBuffer opbuf;
2822                 Operation *op;
2823                 SlapReply rs = {REP_RESULT};
2824                 void *thrctx;
2825
2826                 thrctx = ldap_pvt_thread_pool_context();
2827                 connection_fake_init( &conn, &opbuf, thrctx );
2828                 op = &opbuf.ob_op;
2829                 op->o_bd = be;
2830                 op->o_dn = be->be_rootdn;
2831                 op->o_ndn = be->be_rootndn;
2832                 syncprov_checkpoint( op, &rs, on );
2833         }
2834
2835     return 0;
2836 }
2837
2838 static int
2839 syncprov_db_init(
2840         BackendDB *be,
2841         ConfigReply *cr
2842 )
2843 {
2844         slap_overinst   *on = (slap_overinst *)be->bd_info;
2845         syncprov_info_t *si;
2846
2847         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2848                 Debug( LDAP_DEBUG_ANY,
2849                         "syncprov must be instantiated within a database.\n",
2850                         0, 0, 0 );
2851                 return 1;
2852         }
2853
2854         si = ch_calloc(1, sizeof(syncprov_info_t));
2855         on->on_bi.bi_private = si;
2856         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2857         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2858         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2859
2860         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2861         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2862         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2863         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2864
2865         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2866         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2867
2868         return 0;
2869 }
2870
2871 static int
2872 syncprov_db_destroy(
2873         BackendDB *be,
2874         ConfigReply *cr
2875 )
2876 {
2877         slap_overinst   *on = (slap_overinst *)be->bd_info;
2878         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2879
2880         if ( si ) {
2881                 if ( si->si_logs ) {
2882                         slog_entry *se = si->si_logs->sl_head;
2883
2884                         while ( se ) {
2885                                 slog_entry *se_next = se->se_next;
2886                                 ch_free( se );
2887                                 se = se_next;
2888                         }
2889
2890                         ch_free( si->si_logs );
2891                 }
2892                 if ( si->si_ctxcsn )
2893                         ber_bvarray_free( si->si_ctxcsn );
2894                 if ( si->si_sids )
2895                         ch_free( si->si_sids );
2896                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2897                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2898                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2899                 ch_free( si );
2900         }
2901
2902         return 0;
2903 }
2904
2905 static int syncprov_parseCtrl (
2906         Operation *op,
2907         SlapReply *rs,
2908         LDAPControl *ctrl )
2909 {
2910         ber_tag_t tag;
2911         BerElementBuffer berbuf;
2912         BerElement *ber = (BerElement *)&berbuf;
2913         ber_int_t mode;
2914         ber_len_t len;
2915         struct berval cookie = BER_BVNULL;
2916         sync_control *sr;
2917         int rhint = 0;
2918
2919         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2920                 rs->sr_text = "Sync control specified multiple times";
2921                 return LDAP_PROTOCOL_ERROR;
2922         }
2923
2924         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2925                 rs->sr_text = "Sync control specified with pagedResults control";
2926                 return LDAP_PROTOCOL_ERROR;
2927         }
2928
2929         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2930                 rs->sr_text = "Sync control value is absent";
2931                 return LDAP_PROTOCOL_ERROR;
2932         }
2933
2934         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2935                 rs->sr_text = "Sync control value is empty";
2936                 return LDAP_PROTOCOL_ERROR;
2937         }
2938
2939         /* Parse the control value
2940          *      syncRequestValue ::= SEQUENCE {
2941          *              mode   ENUMERATED {
2942          *                      -- 0 unused
2943          *                      refreshOnly             (1),
2944          *                      -- 2 reserved
2945          *                      refreshAndPersist       (3)
2946          *              },
2947          *              cookie  syncCookie OPTIONAL
2948          *      }
2949          */
2950
2951         ber_init2( ber, &ctrl->ldctl_value, 0 );
2952
2953         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2954                 rs->sr_text = "Sync control : mode decoding error";
2955                 return LDAP_PROTOCOL_ERROR;
2956         }
2957
2958         switch( mode ) {
2959         case LDAP_SYNC_REFRESH_ONLY:
2960                 mode = SLAP_SYNC_REFRESH;
2961                 break;
2962         case LDAP_SYNC_REFRESH_AND_PERSIST:
2963                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2964                 break;
2965         default:
2966                 rs->sr_text = "Sync control : unknown update mode";
2967                 return LDAP_PROTOCOL_ERROR;
2968         }
2969
2970         tag = ber_peek_tag( ber, &len );
2971
2972         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2973                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2974                         rs->sr_text = "Sync control : cookie decoding error";
2975                         return LDAP_PROTOCOL_ERROR;
2976                 }
2977                 tag = ber_peek_tag( ber, &len );
2978         }
2979         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2980                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2981                         rs->sr_text = "Sync control : rhint decoding error";
2982                         return LDAP_PROTOCOL_ERROR;
2983                 }
2984         }
2985         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2986                         rs->sr_text = "Sync control : decoding error";
2987                         return LDAP_PROTOCOL_ERROR;
2988         }
2989         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2990         sr->sr_rhint = rhint;
2991         if (!BER_BVISNULL(&cookie)) {
2992                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2993                 /* If parse fails, pretend no cookie was sent */
2994                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2995                         sr->sr_state.rid == -1 ) {
2996                         if ( sr->sr_state.ctxcsn ) {
2997                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2998                                 sr->sr_state.ctxcsn = NULL;
2999                         }
3000                         sr->sr_state.numcsns = 0;
3001                 }
3002         }
3003
3004         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3005
3006         op->o_sync = ctrl->ldctl_iscritical
3007                 ? SLAP_CONTROL_CRITICAL
3008                 : SLAP_CONTROL_NONCRITICAL;
3009
3010         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3011
3012         return LDAP_SUCCESS;
3013 }
3014
3015 /* This overlay is set up for dynamic loading via moduleload. For static
3016  * configuration, you'll need to arrange for the slap_overinst to be
3017  * initialized and registered by some other function inside slapd.
3018  */
3019
3020 static slap_overinst            syncprov;
3021
3022 int
3023 syncprov_initialize()
3024 {
3025         int rc;
3026
3027         rc = register_supported_control( LDAP_CONTROL_SYNC,
3028                 SLAP_CTRL_SEARCH, NULL,
3029                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3030         if ( rc != LDAP_SUCCESS ) {
3031                 Debug( LDAP_DEBUG_ANY,
3032                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3033                 return rc;
3034         }
3035
3036         syncprov.on_bi.bi_type = "syncprov";
3037         syncprov.on_bi.bi_db_init = syncprov_db_init;
3038         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3039         syncprov.on_bi.bi_db_open = syncprov_db_open;
3040         syncprov.on_bi.bi_db_close = syncprov_db_close;
3041
3042         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3043         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3044
3045         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3046         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3047         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3048         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3049         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3050         syncprov.on_bi.bi_op_search = syncprov_op_search;
3051         syncprov.on_bi.bi_extended = syncprov_op_extended;
3052         syncprov.on_bi.bi_operational = syncprov_operational;
3053
3054         syncprov.on_bi.bi_cf_ocs = spocs;
3055
3056         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3057
3058         rc = config_register_schema( spcfg, spocs );
3059         if ( rc ) return rc;
3060
3061         return overlay_register( &syncprov );
3062 }
3063
3064 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3065 int
3066 init_module( int argc, char *argv[] )
3067 {
3068         return syncprov_initialize();
3069 }
3070 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3071
3072 #endif /* defined(SLAPD_OVER_SYNCPROV) */