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 2004-2013 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 #define CHECK_CSN       1
  32
  33 /* A modify request on a particular entry */
  34 typedef struct modinst {
  35         struct modinst *mi_next;
  36         Operation *mi_op;
  37 } modinst;
  38
  39 typedef struct modtarget {
  40         struct modinst *mt_mods;
  41         struct modinst *mt_tail;
  42         struct berval mt_dn;
  43         ldap_pvt_thread_mutex_t mt_mutex;
  44 } modtarget;
  45
  46 /* A queued result of a persistent search */
  47 typedef struct syncres {
  48         struct syncres *s_next;
  49         Entry *s_e;
  50         struct berval s_dn;
  51         struct berval s_ndn;
  52         struct berval s_uuid;
  53         struct berval s_csn;
  54         char s_mode;
  55         char s_isreference;
  56 } syncres;
  57
  58 /* Record of a persistent search */
  59 typedef struct syncops {
  60         struct syncops *s_next;
  61         struct berval   s_base;         /* ndn of search base */
  62         ID              s_eid;          /* entryID of search base */
  63         Operation       *s_op;          /* search op */
  64         int             s_rid;
  65         int             s_sid;
  66         struct berval s_filterstr;
  67         int             s_flags;        /* search status */
  68 #define PS_IS_REFRESHING        0x01
  69 #define PS_IS_DETACHED          0x02
  70 #define PS_WROTE_BASE           0x04
  71 #define PS_FIND_BASE            0x08
  72 #define PS_FIX_FILTER           0x10
  73 #define PS_TASK_QUEUED          0x20
  74
  75         int             s_inuse;        /* reference count */
  76         struct syncres *s_res;
  77         struct syncres *s_restail;
  78         ldap_pvt_thread_mutex_t s_mutex;
  79 } syncops;
  80
  81 /* A received sync control */
  82 typedef struct sync_control {
  83         struct sync_cookie sr_state;
  84         int sr_rhint;
  85 } sync_control;
  86
  87 #if 0 /* moved back to slap.h */
  88 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  89 #endif
  90 /* o_sync_mode uses data bits of o_sync */
  91 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  92
  93 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  95 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  97
  98 /* Record of which searches matched at premodify step */
  99 typedef struct syncmatches {
 100         struct syncmatches *sm_next;
 101         syncops *sm_op;
 102 } syncmatches;
 103
 104 /* Session log data */
 105 typedef struct slog_entry {
 106         struct slog_entry *se_next;
 107         struct berval se_uuid;
 108         struct berval se_csn;
 109         int     se_sid;
 110         ber_tag_t       se_tag;
 111 } slog_entry;
 112
 113 typedef struct sessionlog {
 114         BerVarray       sl_mincsn;
 115         int             *sl_sids;
 116         int             sl_numcsns;
 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         struct berval   si_contextdn;
 128         BerVarray       si_ctxcsn;      /* ldapsync context */
 129         int             *si_sids;
 130         int             si_numcsns;
 131         int             si_chkops;      /* checkpointing info */
 132         int             si_chktime;
 133         int             si_numops;      /* number of ops since last checkpoint */
 134         int             si_nopres;      /* Skip present phase */
 135         int             si_usehint;     /* use reload hint */
 136         int             si_active;      /* True if there are active mods */
 137         int             si_dirty;       /* True if the context is dirty, i.e changes
 138                                                  * have been made without updating the csn. */
 139         time_t  si_chklast;     /* time of last checkpoint */
 140         Avlnode *si_mods;       /* entries being modified */
 141         sessionlog      *si_logs;
 142         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 143         ldap_pvt_thread_mutex_t si_ops_mutex;
 144         ldap_pvt_thread_mutex_t si_mods_mutex;
 145         ldap_pvt_thread_mutex_t si_resp_mutex;
 146 } syncprov_info_t;
 147
 148 typedef struct opcookie {
 149         slap_overinst *son;
 150         syncmatches *smatches;
 151         modtarget *smt;
 152         Entry *se;
 153         struct berval sdn;      /* DN of entry, for deletes */
 154         struct berval sndn;
 155         struct berval suuid;    /* UUID of entry */
 156         struct berval sctxcsn;
 157         short osid;     /* sid of op csn */
 158         short rsid;     /* sid of relay */
 159         short sreference;       /* Is the entry a reference? */
 160 } opcookie;
 161
 162 typedef struct mutexint {
 163         ldap_pvt_thread_mutex_t mi_mutex;
 164         int mi_int;
 165 } mutexint;
 166
 167 typedef struct fbase_cookie {
 168         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 169         syncops *fss;   /* persistent search we're testing against */
 170         int fbase;      /* if TRUE we found the search base and it's still valid */
 171         int fscope;     /* if TRUE then fdn is within the psearch scope */
 172 } fbase_cookie;
 173
 174 static AttributeName csn_anlist[3];
 175 static AttributeName uuid_anlist[2];
 176
 177 /* Build a LDAPsync intermediate state control */
 178 static int
 179 syncprov_state_ctrl(
 180         Operation       *op,
 181         SlapReply       *rs,
 182         Entry           *e,
 183         int             entry_sync_state,
 184         LDAPControl     **ctrls,
 185         int             num_ctrls,
 186         int             send_cookie,
 187         struct berval   *cookie )
 188 {
 189         Attribute* a;
 190         int ret;
 191
 192         BerElementBuffer berbuf;
 193         BerElement *ber = (BerElement *)&berbuf;
 194         LDAPControl *cp;
 195         struct berval bv;
 196         struct berval   entryuuid_bv = BER_BVNULL;
 197
 198         ber_init2( ber, 0, LBER_USE_DER );
 199         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 200
 201         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 202                 AttributeDescription *desc = a->a_desc;
 203                 if ( desc == slap_schema.si_ad_entryUUID ) {
 204                         entryuuid_bv = a->a_nvals[0];
 205                         break;
 206                 }
 207         }
 208
 209         /* FIXME: what if entryuuid is NULL or empty ? */
 210
 211         if ( send_cookie && cookie ) {
 212                 ber_printf( ber, "{eOON}",
 213                         entry_sync_state, &entryuuid_bv, cookie );
 214         } else {
 215                 ber_printf( ber, "{eON}",
 216                         entry_sync_state, &entryuuid_bv );
 217         }
 218
 219         ret = ber_flatten2( ber, &bv, 0 );
 220         if ( ret == 0 ) {
 221                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 222                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 223                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 224                 cp->ldctl_value.bv_val = (char *)&cp[1];
 225                 cp->ldctl_value.bv_len = bv.bv_len;
 226                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 227                 ctrls[num_ctrls] = cp;
 228         }
 229         ber_free_buf( ber );
 230
 231         if ( ret < 0 ) {
 232                 Debug( LDAP_DEBUG_TRACE,
 233                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 234                         ret, 0, 0 );
 235                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 236                 return LDAP_OTHER;
 237         }
 238
 239         return LDAP_SUCCESS;
 240 }
 241
 242 /* Build a LDAPsync final state control */
 243 static int
 244 syncprov_done_ctrl(
 245         Operation       *op,
 246         SlapReply       *rs,
 247         LDAPControl     **ctrls,
 248         int                     num_ctrls,
 249         int                     send_cookie,
 250         struct berval *cookie,
 251         int                     refreshDeletes )
 252 {
 253         int ret;
 254         BerElementBuffer berbuf;
 255         BerElement *ber = (BerElement *)&berbuf;
 256         LDAPControl *cp;
 257         struct berval bv;
 258
 259         ber_init2( ber, NULL, LBER_USE_DER );
 260         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 261
 262         ber_printf( ber, "{" );
 263         if ( send_cookie && cookie ) {
 264                 ber_printf( ber, "O", cookie );
 265         }
 266         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 267                 ber_printf( ber, "b", refreshDeletes );
 268         }
 269         ber_printf( ber, "N}" );
 270
 271         ret = ber_flatten2( ber, &bv, 0 );
 272         if ( ret == 0 ) {
 273                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 274                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 275                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 276                 cp->ldctl_value.bv_val = (char *)&cp[1];
 277                 cp->ldctl_value.bv_len = bv.bv_len;
 278                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 279                 ctrls[num_ctrls] = cp;
 280         }
 281
 282         ber_free_buf( ber );
 283
 284         if ( ret < 0 ) {
 285                 Debug( LDAP_DEBUG_TRACE,
 286                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 287                         ret, 0, 0 );
 288                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 289                 return LDAP_OTHER;
 290         }
 291
 292         return LDAP_SUCCESS;
 293 }
 294
 295 static int
 296 syncprov_sendinfo(
 297         Operation       *op,
 298         SlapReply       *rs,
 299         int                     type,
 300         struct berval *cookie,
 301         int                     refreshDone,
 302         BerVarray       syncUUIDs,
 303         int                     refreshDeletes )
 304 {
 305         BerElementBuffer berbuf;
 306         BerElement *ber = (BerElement *)&berbuf;
 307         struct berval rspdata;
 308
 309         int ret;
 310
 311         ber_init2( ber, NULL, LBER_USE_DER );
 312         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 313
 314         if ( type ) {
 315                 switch ( type ) {
 316                 case LDAP_TAG_SYNC_NEW_COOKIE:
 317                         ber_printf( ber, "tO", type, cookie );
 318                         break;
 319                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 320                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 321                         ber_printf( ber, "t{", type );
 322                         if ( cookie ) {
 323                                 ber_printf( ber, "O", cookie );
 324                         }
 325                         if ( refreshDone == 0 ) {
 326                                 ber_printf( ber, "b", refreshDone );
 327                         }
 328                         ber_printf( ber, "N}" );
 329                         break;
 330                 case LDAP_TAG_SYNC_ID_SET:
 331                         ber_printf( ber, "t{", type );
 332                         if ( cookie ) {
 333                                 ber_printf( ber, "O", cookie );
 334                         }
 335                         if ( refreshDeletes == 1 ) {
 336                                 ber_printf( ber, "b", refreshDeletes );
 337                         }
 338                         ber_printf( ber, "[W]", syncUUIDs );
 339                         ber_printf( ber, "N}" );
 340                         break;
 341                 default:
 342                         Debug( LDAP_DEBUG_TRACE,
 343                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 344                                 type, 0, 0 );
 345                         return LDAP_OTHER;
 346                 }
 347         }
 348
 349         ret = ber_flatten2( ber, &rspdata, 0 );
 350
 351         if ( ret < 0 ) {
 352                 Debug( LDAP_DEBUG_TRACE,
 353                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 354                         ret, 0, 0 );
 355                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 356                 return LDAP_OTHER;
 357         }
 358
 359         rs->sr_rspoid = LDAP_SYNC_INFO;
 360         rs->sr_rspdata = &rspdata;
 361         send_ldap_intermediate( op, rs );
 362         rs->sr_rspdata = NULL;
 363         ber_free_buf( ber );
 364
 365         return LDAP_SUCCESS;
 366 }
 367
 368 /* Find a modtarget in an AVL tree */
 369 static int
 370 sp_avl_cmp( const void *c1, const void *c2 )
 371 {
 372         const modtarget *m1, *m2;
 373         int rc;
 374
 375         m1 = c1; m2 = c2;
 376         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 377
 378         if ( rc ) return rc;
 379         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 380 }
 381
 382 /* syncprov_findbase:
 383  *   finds the true DN of the base of a search (with alias dereferencing) and
 384  * checks to make sure the base entry doesn't get replaced with a different
 385  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 386  * change is detected, any persistent search on this base must be terminated /
 387  * reloaded.
 388  *   On the first call, we just save the DN and entryID. On subsequent calls
 389  * we compare the DN and entryID with the saved values.
 390  */
 391 static int
 392 findbase_cb( Operation *op, SlapReply *rs )
 393 {
 394         slap_callback *sc = op->o_callback;
 395
 396         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 397                 fbase_cookie *fc = sc->sc_private;
 398
 399                 /* If no entryID, we're looking for the first time.
 400                  * Just store whatever we got.
 401                  */
 402                 if ( fc->fss->s_eid == NOID ) {
 403                         fc->fbase = 2;
 404                         fc->fss->s_eid = rs->sr_entry->e_id;
 405                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 406
 407                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 408                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 409
 410                 /* OK, the DN is the same and the entryID is the same. */
 411                         fc->fbase = 1;
 412                 }
 413         }
 414         if ( rs->sr_err != LDAP_SUCCESS ) {
 415                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 416         }
 417         return LDAP_SUCCESS;
 418 }
 419
 420 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 421 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 422
 423 static int
 424 syncprov_findbase( Operation *op, fbase_cookie *fc )
 425 {
 426         /* Use basic parameters from syncrepl search, but use
 427          * current op's threadctx / tmpmemctx
 428          */
 429         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 430         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 431                 slap_callback cb = {0};
 432                 Operation fop;
 433                 SlapReply frs = { REP_RESULT };
 434                 int rc;
 435
 436                 fc->fss->s_flags ^= PS_FIND_BASE;
 437                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 438
 439                 fop = *fc->fss->s_op;
 440
 441                 fop.o_bd = fop.o_bd->bd_self;
 442                 fop.o_hdr = op->o_hdr;
 443                 fop.o_time = op->o_time;
 444                 fop.o_tincr = op->o_tincr;
 445                 fop.o_extra = op->o_extra;
 446
 447                 cb.sc_response = findbase_cb;
 448                 cb.sc_private = fc;
 449
 450                 fop.o_sync_mode = 0;    /* turn off sync mode */
 451                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 452                 fop.o_callback = &cb;
 453                 LDAP_SLIST_INIT( &fop.o_extra );
 454                 fop.o_tag = LDAP_REQ_SEARCH;
 455                 fop.ors_scope = LDAP_SCOPE_BASE;
 456                 fop.ors_limit = NULL;
 457                 fop.ors_slimit = 1;
 458                 fop.ors_tlimit = SLAP_NO_LIMIT;
 459                 fop.ors_attrs = slap_anlist_no_attrs;
 460                 fop.ors_attrsonly = 1;
 461                 fop.ors_filter = &generic_filter;
 462                 fop.ors_filterstr = generic_filterstr;
 463
 464                 rc = fop.o_bd->be_search( &fop, &frs );
 465         } else {
 466                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 467                 fc->fbase = 1;
 468         }
 469
 470         /* After the first call, see if the fdn resides in the scope */
 471         if ( fc->fbase == 1 ) {
 472                 switch ( fc->fss->s_op->ors_scope ) {
 473                 case LDAP_SCOPE_BASE:
 474                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 475                         break;
 476                 case LDAP_SCOPE_ONELEVEL: {
 477                         struct berval pdn;
 478                         dnParent( fc->fdn, &pdn );
 479                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 480                         break; }
 481                 case LDAP_SCOPE_SUBTREE:
 482                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 483                         break;
 484                 case LDAP_SCOPE_SUBORDINATE:
 485                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 486                                 !dn_match( fc->fdn, &fc->fss->s_base );
 487                         break;
 488                 }
 489         }
 490
 491         if ( fc->fbase )
 492                 return LDAP_SUCCESS;
 493
 494         /* If entryID has changed, then the base of this search has
 495          * changed. Invalidate the psearch.
 496          */
 497         return LDAP_NO_SUCH_OBJECT;
 498 }
 499
 500 /* syncprov_findcsn:
 501  *   This function has three different purposes, but they all use a search
 502  * that filters on entryCSN so they're combined here.
 503  * 1: at startup time, after a contextCSN has been read from the database,
 504  * we search for all entries with CSN >= contextCSN in case the contextCSN
 505  * was not checkpointed at the previous shutdown.
 506  *
 507  * 2: when the current contextCSN is known and we have a sync cookie, we search
 508  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 509  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 510  *
 511  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 512  * CSN, and generate Present records for them. We always collect this result
 513  * in SyncID sets, even if there's only one match.
 514  */
 515 typedef enum find_csn_t {
 516         FIND_MAXCSN     = 1,
 517         FIND_CSN        = 2,
 518         FIND_PRESENT    = 3
 519 } find_csn_t;
 520
 521 static int
 522 findmax_cb( Operation *op, SlapReply *rs )
 523 {
 524         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 525                 struct berval *maxcsn = op->o_callback->sc_private;
 526                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 527                         slap_schema.si_ad_entryCSN );
 528
 529                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 530                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 531                         maxcsn->bv_len = a->a_vals[0].bv_len;
 532                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 533                 }
 534         }
 535         return LDAP_SUCCESS;
 536 }
 537
 538 static int
 539 findcsn_cb( Operation *op, SlapReply *rs )
 540 {
 541         slap_callback *sc = op->o_callback;
 542
 543         /* We just want to know that at least one exists, so it's OK if
 544          * we exceed the unchecked limit.
 545          */
 546         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 547                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 548                 sc->sc_private = (void *)1;
 549         }
 550         return LDAP_SUCCESS;
 551 }
 552
 553 /* Build a list of entryUUIDs for sending in a SyncID set */
 554
 555 #define UUID_LEN        16
 556
 557 typedef struct fpres_cookie {
 558         int num;
 559         BerVarray uuids;
 560         char *last;
 561 } fpres_cookie;
 562
 563 static int
 564 findpres_cb( Operation *op, SlapReply *rs )
 565 {
 566         slap_callback *sc = op->o_callback;
 567         fpres_cookie *pc = sc->sc_private;
 568         Attribute *a;
 569         int ret = SLAP_CB_CONTINUE;
 570
 571         switch ( rs->sr_type ) {
 572         case REP_SEARCH:
 573                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 574                 if ( a ) {
 575                         pc->uuids[pc->num].bv_val = pc->last;
 576                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 577                                 pc->uuids[pc->num].bv_len );
 578                         pc->num++;
 579                         pc->last = pc->uuids[pc->num].bv_val;
 580                         pc->uuids[pc->num].bv_val = NULL;
 581                 }
 582                 ret = LDAP_SUCCESS;
 583                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 584                         break;
 585                 /* FALLTHRU */
 586         case REP_RESULT:
 587                 ret = rs->sr_err;
 588                 if ( pc->num ) {
 589                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 590                                 0, pc->uuids, 0 );
 591                         pc->uuids[pc->num].bv_val = pc->last;
 592                         pc->num = 0;
 593                         pc->last = pc->uuids[0].bv_val;
 594                 }
 595                 break;
 596         default:
 597                 break;
 598         }
 599         return ret;
 600 }
 601
 602 static int
 603 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 604 {
 605         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 606         syncprov_info_t         *si = on->on_bi.bi_private;
 607
 608         slap_callback cb = {0};
 609         Operation fop;
 610         SlapReply frs = { REP_RESULT };
 611         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 612         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 613         struct berval maxcsn;
 614         Filter cf;
 615         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 616         fpres_cookie pcookie;
 617         sync_control *srs = NULL;
 618         struct slap_limits_set fc_limits;
 619         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 620         int maxid;
 621
 622         if ( mode != FIND_MAXCSN ) {
 623                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 624         }
 625
 626         fop = *op;
 627         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 628         /* We want pure entries, not referrals */
 629         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 630
 631         cf.f_ava = &eq;
 632         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 633         BER_BVZERO( &cf.f_av_value );
 634         cf.f_next = NULL;
 635
 636         fop.o_callback = &cb;
 637         fop.ors_limit = NULL;
 638         fop.ors_tlimit = SLAP_NO_LIMIT;
 639         fop.ors_filter = &cf;
 640         fop.ors_filterstr.bv_val = buf;
 641
 642 again:
 643         switch( mode ) {
 644         case FIND_MAXCSN:
 645                 cf.f_choice = LDAP_FILTER_GE;
 646                 /* If there are multiple CSNs, use the one with our serverID */
 647                 for ( i=0; i<si->si_numcsns; i++) {
 648                         if ( slap_serverID == si->si_sids[i] ) {
 649                                 maxid = i;
 650                                 break;
 651                         }
 652                 }
 653                 if ( i == si->si_numcsns ) {
 654                         /* No match: this is multimaster, and none of the content in the DB
 655                          * originated locally. Treat like no CSN.
 656                          */
 657                         return LDAP_NO_SUCH_OBJECT;
 658                 }
 659                 cf.f_av_value = si->si_ctxcsn[maxid];
 660                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 661                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 662                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 663                         return LDAP_OTHER;
 664                 }
 665                 fop.ors_attrsonly = 0;
 666                 fop.ors_attrs = csn_anlist;
 667                 fop.ors_slimit = SLAP_NO_LIMIT;
 668                 cb.sc_private = &maxcsn;
 669                 cb.sc_response = findmax_cb;
 670                 strcpy( cbuf, cf.f_av_value.bv_val );
 671                 maxcsn.bv_val = cbuf;
 672                 maxcsn.bv_len = cf.f_av_value.bv_len;
 673                 break;
 674         case FIND_CSN:
 675                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 676                         cf.f_av_value = *csn;
 677                 }
 678                 fop.o_dn = op->o_bd->be_rootdn;
 679                 fop.o_ndn = op->o_bd->be_rootndn;
 680                 fop.o_req_dn = op->o_bd->be_suffix[0];
 681                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 682                 /* Look for exact match the first time */
 683                 if ( findcsn_retry ) {
 684                         cf.f_choice = LDAP_FILTER_EQUALITY;
 685                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 686                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 687                 /* On retry, look for <= */
 688                 } else {
 689                         cf.f_choice = LDAP_FILTER_LE;
 690                         fop.ors_limit = &fc_limits;
 691                         memset( &fc_limits, 0, sizeof( fc_limits ));
 692                         fc_limits.lms_s_unchecked = 1;
 693                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 694                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 695                 }
 696                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 697                         return LDAP_OTHER;
 698                 }
 699                 fop.ors_attrsonly = 1;
 700                 fop.ors_attrs = slap_anlist_no_attrs;
 701                 fop.ors_slimit = 1;
 702                 cb.sc_private = NULL;
 703                 cb.sc_response = findcsn_cb;
 704                 break;
 705         case FIND_PRESENT:
 706                 fop.ors_filter = op->ors_filter;
 707                 fop.ors_filterstr = op->ors_filterstr;
 708                 fop.ors_attrsonly = 0;
 709                 fop.ors_attrs = uuid_anlist;
 710                 fop.ors_slimit = SLAP_NO_LIMIT;
 711                 cb.sc_private = &pcookie;
 712                 cb.sc_response = findpres_cb;
 713                 pcookie.num = 0;
 714
 715                 /* preallocate storage for a full set */
 716                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 717                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 718                         op->o_tmpmemctx );
 719                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 720                 pcookie.uuids[0].bv_val = pcookie.last;
 721                 pcookie.uuids[0].bv_len = UUID_LEN;
 722                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 723                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 724                         pcookie.uuids[i].bv_len = UUID_LEN;
 725                 }
 726                 break;
 727         }
 728
 729         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 730         fop.o_bd->be_search( &fop, &frs );
 731         fop.o_bd->bd_info = (BackendInfo *)on;
 732
 733         switch( mode ) {
 734         case FIND_MAXCSN:
 735                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 736 #ifdef CHECK_CSN
 737                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 738                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 739 #endif
 740                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 741                         si->si_numops++;        /* ensure a checkpoint */
 742                 }
 743                 break;
 744         case FIND_CSN:
 745                 /* If matching CSN was not found, invalidate the context. */
 746                 if ( !cb.sc_private ) {
 747                         /* If we didn't find an exact match, then try for <= */
 748                         if ( findcsn_retry ) {
 749                                 findcsn_retry = 0;
 750                                 rs_reinit( &frs, REP_RESULT );
 751                                 goto again;
 752                         }
 753                         rc = LDAP_NO_SUCH_OBJECT;
 754                 }
 755                 break;
 756         case FIND_PRESENT:
 757                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 758                 break;
 759         }
 760
 761         return rc;
 762 }
 763
 764 /* Should find a place to cache these */
 765 static mutexint *get_mutexint()
 766 {
 767         mutexint *mi = ch_malloc( sizeof( mutexint ));
 768         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 769         mi->mi_int = 1;
 770         return mi;
 771 }
 772
 773 static void inc_mutexint( mutexint *mi )
 774 {
 775         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 776         mi->mi_int++;
 777         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 778 }
 779
 780 /* return resulting counter */
 781 static int dec_mutexint( mutexint *mi )
 782 {
 783         int i;
 784         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 785         i = --mi->mi_int;
 786         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 787         if ( !i ) {
 788                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 789                 ch_free( mi );
 790         }
 791         return i;
 792 }
 793
 794 static void
 795 syncprov_free_syncop( syncops *so )
 796 {
 797         syncres *sr, *srnext;
 798         GroupAssertion *ga, *gnext;
 799
 800         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 801         /* already being freed, or still in use */
 802         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 803                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 804                 return;
 805         }
 806         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 807         if ( so->s_flags & PS_IS_DETACHED ) {
 808                 filter_free( so->s_op->ors_filter );
 809                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 810                         gnext = ga->ga_next;
 811                         ch_free( ga );
 812                 }
 813                 ch_free( so->s_op );
 814         }
 815         ch_free( so->s_base.bv_val );
 816         for ( sr=so->s_res; sr; sr=srnext ) {
 817                 srnext = sr->s_next;
 818                 if ( sr->s_e ) {
 819                         if ( !dec_mutexint( sr->s_e->e_private )) {
 820                                 sr->s_e->e_private = NULL;
 821                                 entry_free( sr->s_e );
 822                         }
 823                 }
 824                 ch_free( sr );
 825         }
 826         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 827         ch_free( so );
 828 }
 829
 830 /* Send a persistent search response */
 831 static int
 832 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 833 {
 834         SlapReply rs = { REP_SEARCH };
 835         struct berval cookie, csns[2];
 836         Entry e_uuid = {0};
 837         Attribute a_uuid = {0};
 838
 839         if ( so->s_op->o_abandon )
 840                 return SLAPD_ABANDON;
 841
 842         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 843         rs.sr_ctrls[1] = NULL;
 844         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 845         csns[0] = opc->sctxcsn;
 846         BER_BVZERO( &csns[1] );
 847         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 848
 849 #ifdef LDAP_DEBUG
 850         if ( so->s_sid > 0 ) {
 851                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 852                         so->s_sid, cookie.bv_val, 0 );
 853         } else {
 854                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 855                         cookie.bv_val, 0, 0 );
 856         }
 857 #endif
 858
 859         e_uuid.e_attrs = &a_uuid;
 860         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 861         a_uuid.a_nvals = &opc->suuid;
 862         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 863                 mode, rs.sr_ctrls, 0, 1, &cookie );
 864         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 865
 866         rs.sr_entry = &e_uuid;
 867         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 868                 e_uuid = *opc->se;
 869                 e_uuid.e_private = NULL;
 870         }
 871
 872         switch( mode ) {
 873         case LDAP_SYNC_ADD:
 874                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 875                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 876                         rs.sr_err = send_search_reference( op, &rs );
 877                         ber_bvarray_free( rs.sr_ref );
 878                         break;
 879                 }
 880                 /* fallthru */
 881         case LDAP_SYNC_MODIFY:
 882                 rs.sr_attrs = op->ors_attrs;
 883                 rs.sr_err = send_search_entry( op, &rs );
 884                 break;
 885         case LDAP_SYNC_DELETE:
 886                 e_uuid.e_attrs = NULL;
 887                 e_uuid.e_name = opc->sdn;
 888                 e_uuid.e_nname = opc->sndn;
 889                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 890                         struct berval bv = BER_BVNULL;
 891                         rs.sr_ref = &bv;
 892                         rs.sr_err = send_search_reference( op, &rs );
 893                 } else {
 894                         rs.sr_err = send_search_entry( op, &rs );
 895                 }
 896                 break;
 897         default:
 898                 assert(0);
 899         }
 900         return rs.sr_err;
 901 }
 902
 903 static void
 904 syncprov_qstart( syncops *so );
 905
 906 /* Play back queued responses */
 907 static int
 908 syncprov_qplay( Operation *op, syncops *so )
 909 {
 910         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 911         syncres *sr;
 912         opcookie opc;
 913         int rc = 0;
 914
 915         opc.son = on;
 916
 917         do {
 918                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 919                 sr = so->s_res;
 920                 /* Exit loop with mutex held */
 921                 if ( !sr )
 922                         break;
 923                 so->s_res = sr->s_next;
 924                 if ( !so->s_res )
 925                         so->s_restail = NULL;
 926                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 927
 928                 if ( !so->s_op->o_abandon ) {
 929
 930                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 931                                 SlapReply rs = { REP_INTERMEDIATE };
 932
 933                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 934                                         &sr->s_csn, 0, NULL, 0 );
 935                         } else {
 936                                 opc.sdn = sr->s_dn;
 937                                 opc.sndn = sr->s_ndn;
 938                                 opc.suuid = sr->s_uuid;
 939                                 opc.sctxcsn = sr->s_csn;
 940                                 opc.sreference = sr->s_isreference;
 941                                 opc.se = sr->s_e;
 942
 943                                 rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 944                         }
 945                 }
 946
 947                 if ( sr->s_e ) {
 948                         if ( !dec_mutexint( sr->s_e->e_private )) {
 949                                 sr->s_e->e_private = NULL;
 950                                 entry_free ( sr->s_e );
 951                         }
 952                 }
 953                 ch_free( sr );
 954
 955                 if ( so->s_op->o_abandon )
 956                         continue;
 957
 958                 /* Exit loop with mutex held */
 959                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 960                 break;
 961
 962         } while (1);
 963
 964         /* We now only send one change at a time, to prevent one
 965          * psearch from hogging all the CPU. Resubmit this task if
 966          * there are more responses queued and no errors occurred.
 967          */
 968
 969         if ( rc == 0 && so->s_res ) {
 970                 syncprov_qstart( so );
 971         } else {
 972                 so->s_flags ^= PS_TASK_QUEUED;
 973         }
 974
 975         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 976         return rc;
 977 }
 978
 979 /* task for playing back queued responses */
 980 static void *
 981 syncprov_qtask( void *ctx, void *arg )
 982 {
 983         syncops *so = arg;
 984         OperationBuffer opbuf;
 985         Operation *op;
 986         BackendDB be;
 987         int rc;
 988
 989         op = &opbuf.ob_op;
 990         *op = *so->s_op;
 991         op->o_hdr = &opbuf.ob_hdr;
 992         op->o_controls = opbuf.ob_controls;
 993         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 994         op->o_sync = SLAP_CONTROL_IGNORED;
 995
 996         *op->o_hdr = *so->s_op->o_hdr;
 997
 998         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 999         op->o_tmpmfuncs = &slap_sl_mfuncs;
1000         op->o_threadctx = ctx;
1001
1002         /* syncprov_qplay expects a fake db */
1003         be = *so->s_op->o_bd;
1004         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1005         op->o_bd = &be;
1006         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1007         op->o_callback = NULL;
1008
1009         rc = syncprov_qplay( op, so );
1010
1011         /* decrement use count... */
1012         syncprov_free_syncop( so );
1013
1014         return NULL;
1015 }
1016
1017 /* Start the task to play back queued psearch responses */
1018 static void
1019 syncprov_qstart( syncops *so )
1020 {
1021         so->s_flags |= PS_TASK_QUEUED;
1022         so->s_inuse++;
1023         ldap_pvt_thread_pool_submit( &connection_pool,
1024                 syncprov_qtask, so );
1025 }
1026
1027 /* Queue a persistent search response */
1028 static int
1029 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1030 {
1031         syncres *sr;
1032         int srsize;
1033         struct berval cookie = opc->sctxcsn;
1034
1035         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1036                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1037
1038                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1039                         so->s_rid, slap_serverID ? slap_serverID : -1);
1040         }
1041
1042         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1043                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1044         if ( cookie.bv_len )
1045                 srsize += cookie.bv_len + 1;
1046         sr = ch_malloc( srsize );
1047         sr->s_next = NULL;
1048         sr->s_e = opc->se;
1049         /* bump refcount on this entry */
1050         if ( opc->se )
1051                 inc_mutexint( opc->se->e_private );
1052         sr->s_dn.bv_val = (char *)(sr + 1);
1053         sr->s_dn.bv_len = opc->sdn.bv_len;
1054         sr->s_mode = mode;
1055         sr->s_isreference = opc->sreference;
1056         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1057                  opc->sdn.bv_val ) + 1;
1058         sr->s_ndn.bv_len = opc->sndn.bv_len;
1059         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1060                  opc->sndn.bv_val ) + 1;
1061         sr->s_uuid.bv_len = opc->suuid.bv_len;
1062         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1063         if ( cookie.bv_len ) {
1064                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1065                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1066         } else {
1067                 sr->s_csn.bv_val = NULL;
1068         }
1069         sr->s_csn.bv_len = cookie.bv_len;
1070
1071         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1072                 ch_free( cookie.bv_val );
1073         }
1074
1075         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1076         if ( !so->s_res ) {
1077                 so->s_res = sr;
1078         } else {
1079                 so->s_restail->s_next = sr;
1080         }
1081         so->s_restail = sr;
1082
1083         /* If the base of the psearch was modified, check it next time round */
1084         if ( so->s_flags & PS_WROTE_BASE ) {
1085                 so->s_flags ^= PS_WROTE_BASE;
1086                 so->s_flags |= PS_FIND_BASE;
1087         }
1088         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1089                 syncprov_qstart( so );
1090         }
1091         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1092         return LDAP_SUCCESS;
1093 }
1094
1095 static int
1096 syncprov_drop_psearch( syncops *so, int lock )
1097 {
1098         if ( so->s_flags & PS_IS_DETACHED ) {
1099                 if ( lock )
1100                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1101                 so->s_op->o_conn->c_n_ops_executing--;
1102                 so->s_op->o_conn->c_n_ops_completed++;
1103                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1104                         o_next );
1105                 if ( lock )
1106                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1107         }
1108         syncprov_free_syncop( so );
1109
1110         return 0;
1111 }
1112
1113 static int
1114 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1115 {
1116         slap_callback *sc = op->o_callback;
1117         op->o_callback = sc->sc_next;
1118         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1119         op->o_tmpfree( sc, op->o_tmpmemctx );
1120         return 0;
1121 }
1122
1123 static int
1124 syncprov_op_abandon( Operation *op, SlapReply *rs )
1125 {
1126         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1127         syncprov_info_t         *si = on->on_bi.bi_private;
1128         syncops *so, *soprev;
1129
1130         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1131         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1132                 soprev=so, so=so->s_next ) {
1133                 if ( so->s_op->o_connid == op->o_connid &&
1134                         so->s_op->o_msgid == op->orn_msgid ) {
1135                                 so->s_op->o_abandon = 1;
1136                                 soprev->s_next = so->s_next;
1137                                 break;
1138                 }
1139         }
1140         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1141         if ( so ) {
1142                 /* Is this really a Cancel exop? */
1143                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1144                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1145                         rs->sr_err = LDAP_CANCELLED;
1146                         send_ldap_result( so->s_op, rs );
1147                         if ( so->s_flags & PS_IS_DETACHED ) {
1148                                 slap_callback *cb;
1149                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1150                                 cb->sc_cleanup = syncprov_ab_cleanup;
1151                                 cb->sc_next = op->o_callback;
1152                                 cb->sc_private = so;
1153                                 op->o_callback = cb;
1154                                 return SLAP_CB_CONTINUE;
1155                         }
1156                 }
1157                 syncprov_drop_psearch( so, 0 );
1158         }
1159         return SLAP_CB_CONTINUE;
1160 }
1161
1162 /* Find which persistent searches are affected by this operation */
1163 static void
1164 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1165 {
1166         slap_overinst *on = opc->son;
1167         syncprov_info_t         *si = on->on_bi.bi_private;
1168
1169         fbase_cookie fc;
1170         syncops *ss, *sprev, *snext;
1171         Entry *e = NULL;
1172         Attribute *a;
1173         int rc;
1174         struct berval newdn;
1175         int freefdn = 0;
1176         BackendDB *b0 = op->o_bd, db;
1177
1178         fc.fdn = &op->o_req_ndn;
1179         /* compute new DN */
1180         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1181                 struct berval pdn;
1182                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1183                 else dnParent( fc.fdn, &pdn );
1184                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1185                 fc.fdn = &newdn;
1186                 freefdn = 1;
1187         }
1188         if ( op->o_tag != LDAP_REQ_ADD ) {
1189                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1190                         db = *op->o_bd;
1191                         op->o_bd = &db;
1192                 }
1193                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1194                 /* If we're sending responses now, make a copy and unlock the DB */
1195                 if ( e && !saveit ) {
1196                         if ( !opc->se ) {
1197                                 opc->se = entry_dup( e );
1198                                 opc->se->e_private = get_mutexint();
1199                         }
1200                         overlay_entry_release_ov( op, e, 0, on );
1201                         e = opc->se;
1202                 }
1203                 if ( rc ) {
1204                         op->o_bd = b0;
1205                         return;
1206                 }
1207         } else {
1208                 e = op->ora_e;
1209                 if ( !saveit ) {
1210                         if ( !opc->se ) {
1211                                 opc->se = entry_dup( e );
1212                                 opc->se->e_private = get_mutexint();
1213                         }
1214                         e = opc->se;
1215                 }
1216         }
1217
1218         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1219                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1220                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1221                 opc->sreference = is_entry_referral( e );
1222                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1223                 if ( a )
1224                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1225         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1226                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1227                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1228                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1229                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1230         }
1231
1232         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1233         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1234                 sprev = ss, ss=snext)
1235         {
1236                 Operation op2;
1237                 Opheader oh;
1238                 syncmatches *sm;
1239                 int found = 0;
1240
1241                 snext = ss->s_next;
1242                 if ( ss->s_op->o_abandon )
1243                         continue;
1244
1245                 /* Don't send ops back to the originator */
1246                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1247                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1248                                 opc->osid, 0, 0 );
1249                         continue;
1250                 }
1251
1252                 /* Don't send ops back to the messenger */
1253                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1254                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1255                                 opc->rsid, 0, 0 );
1256                         continue;
1257                 }
1258
1259                 /* validate base */
1260                 fc.fss = ss;
1261                 fc.fbase = 0;
1262                 fc.fscope = 0;
1263
1264                 /* If the base of the search is missing, signal a refresh */
1265                 rc = syncprov_findbase( op, &fc );
1266                 if ( rc != LDAP_SUCCESS ) {
1267                         SlapReply rs = {REP_RESULT};
1268                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1269                                 "search base has changed" );
1270                         sprev->s_next = snext;
1271                         syncprov_drop_psearch( ss, 1 );
1272                         ss = sprev;
1273                         continue;
1274                 }
1275
1276                 /* If we're sending results now, look for this op in old matches */
1277                 if ( !saveit ) {
1278                         syncmatches *old;
1279
1280                         /* Did we modify the search base? */
1281                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1282                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1283                                 ss->s_flags |= PS_WROTE_BASE;
1284                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1285                         }
1286
1287                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1288                                 old=sm, sm=sm->sm_next ) {
1289                                 if ( sm->sm_op == ss ) {
1290                                         found = 1;
1291                                         old->sm_next = sm->sm_next;
1292                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1293                                         break;
1294                                 }
1295                         }
1296                 }
1297
1298                 if ( fc.fscope ) {
1299                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1300                         op2 = *ss->s_op;
1301                         oh = *op->o_hdr;
1302                         oh.oh_conn = ss->s_op->o_conn;
1303                         oh.oh_connid = ss->s_op->o_connid;
1304                         op2.o_bd = op->o_bd->bd_self;
1305                         op2.o_hdr = &oh;
1306                         op2.o_extra = op->o_extra;
1307                         op2.o_callback = NULL;
1308                         if (ss->s_flags & PS_FIX_FILTER) {
1309                                 /* Skip the AND/GE clause that we stuck on in front. We
1310                                    would lose deletes/mods that happen during the refresh
1311                                    phase otherwise (ITS#6555) */
1312                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1313                         }
1314                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1315                         rc = test_filter( &op2, e, op2.ors_filter );
1316                 }
1317
1318                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1319                         ss->s_sid, fc.fscope, rc );
1320
1321                 /* check if current o_req_dn is in scope and matches filter */
1322                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1323                         if ( saveit ) {
1324                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1325                                 sm->sm_next = opc->smatches;
1326                                 sm->sm_op = ss;
1327                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1328                                 ++ss->s_inuse;
1329                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1330                                 opc->smatches = sm;
1331                         } else {
1332                                 /* if found send UPDATE else send ADD */
1333                                 syncprov_qresp( opc, ss,
1334                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1335                         }
1336                 } else if ( !saveit && found ) {
1337                         /* send DELETE */
1338                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1339                 } else if ( !saveit ) {
1340                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1341                 }
1342                 if ( !saveit && found ) {
1343                         /* Decrement s_inuse, was incremented when called
1344                          * with saveit == TRUE
1345                          */
1346                         syncprov_free_syncop( ss );
1347                 }
1348         }
1349         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1350
1351         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1352                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1353                         op->o_bd = &db;
1354                 }
1355                 if ( saveit )
1356                         overlay_entry_release_ov( op, e, 0, on );
1357                 op->o_bd = b0;
1358         }
1359         if ( opc->se && !saveit ) {
1360                 if ( !dec_mutexint( opc->se->e_private )) {
1361                         opc->se->e_private = NULL;
1362                         entry_free( opc->se );
1363                         opc->se = NULL;
1364                 }
1365         }
1366         if ( freefdn ) {
1367                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1368         }
1369         op->o_bd = b0;
1370 }
1371
1372 static int
1373 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1374 {
1375         slap_callback *cb = op->o_callback;
1376         opcookie *opc = cb->sc_private;
1377         slap_overinst *on = opc->son;
1378         syncprov_info_t         *si = on->on_bi.bi_private;
1379         syncmatches *sm, *snext;
1380         modtarget *mt;
1381
1382         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1383         if ( si->si_active )
1384                 si->si_active--;
1385         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1386
1387         for (sm = opc->smatches; sm; sm=snext) {
1388                 snext = sm->sm_next;
1389                 syncprov_free_syncop( sm->sm_op );
1390                 op->o_tmpfree( sm, op->o_tmpmemctx );
1391         }
1392
1393         /* Remove op from lock table */
1394         mt = opc->smt;
1395         if ( mt ) {
1396                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1397                 mt->mt_mods = mt->mt_mods->mi_next;
1398                 /* If there are more, promote the next one */
1399                 if ( mt->mt_mods ) {
1400                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1401                 } else {
1402                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1403                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1404                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1405                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1406                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1407                         ch_free( mt->mt_dn.bv_val );
1408                         ch_free( mt );
1409                 }
1410         }
1411         if ( !BER_BVISNULL( &opc->suuid ))
1412                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1413         if ( !BER_BVISNULL( &opc->sndn ))
1414                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1415         if ( !BER_BVISNULL( &opc->sdn ))
1416                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1417         op->o_callback = cb->sc_next;
1418         op->o_tmpfree(cb, op->o_tmpmemctx);
1419
1420         return 0;
1421 }
1422
1423 static void
1424 syncprov_checkpoint( Operation *op, slap_overinst *on )
1425 {
1426         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1427         Modifications mod;
1428         Operation opm;
1429         SlapReply rsm = {REP_RESULT};
1430         slap_callback cb = {0};
1431         BackendDB be;
1432         BackendInfo *bi;
1433
1434 #ifdef CHECK_CSN
1435         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1436
1437         int i;
1438         for ( i=0; i<si->si_numcsns; i++ ) {
1439                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1440         }
1441 #endif
1442         mod.sml_numvals = si->si_numcsns;
1443         mod.sml_values = si->si_ctxcsn;
1444         mod.sml_nvalues = NULL;
1445         mod.sml_desc = slap_schema.si_ad_contextCSN;
1446         mod.sml_op = LDAP_MOD_REPLACE;
1447         mod.sml_flags = SLAP_MOD_INTERNAL;
1448         mod.sml_next = NULL;
1449
1450         cb.sc_response = slap_null_cb;
1451         opm = *op;
1452         opm.o_tag = LDAP_REQ_MODIFY;
1453         opm.o_callback = &cb;
1454         opm.orm_modlist = &mod;
1455         opm.orm_no_opattrs = 1;
1456         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1457                 be = *on->on_info->oi_origdb;
1458                 opm.o_bd = &be;
1459         }
1460         opm.o_req_dn = si->si_contextdn;
1461         opm.o_req_ndn = si->si_contextdn;
1462         bi = opm.o_bd->bd_info;
1463         opm.o_bd->bd_info = on->on_info->oi_orig;
1464         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1465         opm.o_no_schema_check = 1;
1466         opm.o_bd->be_modify( &opm, &rsm );
1467
1468         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1469                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1470                 const char      *text;
1471                 char txtbuf[SLAP_TEXT_BUFLEN];
1472                 size_t textlen = sizeof txtbuf;
1473                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1474                 rs_reinit( &rsm, REP_RESULT );
1475                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1476                 opm.ora_e = e;
1477                 opm.o_bd->be_add( &opm, &rsm );
1478                 if ( e == opm.ora_e )
1479                         be_entry_release_w( &opm, opm.ora_e );
1480         }
1481         opm.o_bd->bd_info = bi;
1482
1483         if ( mod.sml_next != NULL ) {
1484                 slap_mods_free( mod.sml_next, 1 );
1485         }
1486 #ifdef CHECK_CSN
1487         for ( i=0; i<si->si_numcsns; i++ ) {
1488                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1489         }
1490 #endif
1491 }
1492
1493 static void
1494 syncprov_add_slog( Operation *op )
1495 {
1496         opcookie *opc = op->o_callback->sc_private;
1497         slap_overinst *on = opc->son;
1498         syncprov_info_t         *si = on->on_bi.bi_private;
1499         sessionlog *sl;
1500         slog_entry *se;
1501
1502         sl = si->si_logs;
1503         {
1504                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1505                         /* During the syncrepl refresh phase we can receive operations
1506                          * without a csn.  We cannot reliably determine the consumers
1507                          * state with respect to such operations, so we ignore them and
1508                          * wipe out anything in the log if we see them.
1509                          */
1510                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1511                         while ( se = sl->sl_head ) {
1512                                 sl->sl_head = se->se_next;
1513                                 ch_free( se );
1514                         }
1515                         sl->sl_tail = NULL;
1516                         sl->sl_num = 0;
1517                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1518                         return;
1519                 }
1520
1521                 /* Allocate a record. UUIDs are not NUL-terminated. */
1522                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1523                         op->o_csn.bv_len + 1 );
1524                 se->se_next = NULL;
1525                 se->se_tag = op->o_tag;
1526
1527                 se->se_uuid.bv_val = (char *)(&se[1]);
1528                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1529                 se->se_uuid.bv_len = opc->suuid.bv_len;
1530
1531                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1532                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1533                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1534                 se->se_csn.bv_len = op->o_csn.bv_len;
1535                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1536
1537                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1538                 if ( sl->sl_head ) {
1539                         /* Keep the list in csn order. */
1540                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1541                                 sl->sl_tail->se_next = se;
1542                                 sl->sl_tail = se;
1543                         } else {
1544                                 slog_entry **sep;
1545
1546                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1547                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1548                                                 se->se_next = *sep;
1549                                                 *sep = se;
1550                                                 break;
1551                                         }
1552                                 }
1553                         }
1554                 } else {
1555                         sl->sl_head = se;
1556                         sl->sl_tail = se;
1557                         if ( !sl->sl_mincsn ) {
1558                                 sl->sl_numcsns = 1;
1559                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1560                                 sl->sl_sids = ch_malloc( sizeof( int ));
1561                                 sl->sl_sids[0] = se->se_sid;
1562                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1563                                 BER_BVZERO( &sl->sl_mincsn[1] );
1564                         }
1565                 }
1566                 sl->sl_num++;
1567                 while ( sl->sl_num > sl->sl_size ) {
1568                         int i, j;
1569                         se = sl->sl_head;
1570                         sl->sl_head = se->se_next;
1571                         for ( i=0; i<sl->sl_numcsns; i++ )
1572                                 if ( sl->sl_sids[i] >= se->se_sid )
1573                                         break;
1574                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1575                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1576                                         i, se->se_sid, &se->se_csn );
1577                         } else {
1578                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1579                         }
1580                         ch_free( se );
1581                         sl->sl_num--;
1582                 }
1583                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1584         }
1585 }
1586
1587 /* Just set a flag if we found the matching entry */
1588 static int
1589 playlog_cb( Operation *op, SlapReply *rs )
1590 {
1591         if ( rs->sr_type == REP_SEARCH ) {
1592                 op->o_callback->sc_private = (void *)1;
1593         }
1594         return rs->sr_err;
1595 }
1596
1597 /* enter with sl->sl_mutex locked, release before returning */
1598 static void
1599 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1600         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1601 {
1602         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1603         slog_entry *se;
1604         int i, j, ndel, num, nmods, mmods;
1605         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1606         BerVarray uuids;
1607         struct berval delcsn[2];
1608
1609         if ( !sl->sl_num ) {
1610                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1611                 return;
1612         }
1613
1614         num = sl->sl_num;
1615         i = 0;
1616         nmods = 0;
1617
1618         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1619                 num * UUID_LEN, op->o_tmpmemctx );
1620         uuids[0].bv_val = (char *)(uuids + num + 1);
1621
1622         delcsn[0].bv_len = 0;
1623         delcsn[0].bv_val = cbuf;
1624         BER_BVZERO(&delcsn[1]);
1625
1626         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1627          * and everything else at the end. Do this first so we can
1628          * unlock the list mutex.
1629          */
1630         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1631                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1632         for ( se=sl->sl_head; se; se=se->se_next ) {
1633                 int k;
1634                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1635                 ndel = 1;
1636                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1637                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1638                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1639                                 break;
1640                         }
1641                 }
1642                 if ( ndel <= 0 ) {
1643                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1644                         continue;
1645                 }
1646                 ndel = 0;
1647                 for ( k=0; k<numcsns; k++ ) {
1648                         if ( se->se_sid == sids[k] ) {
1649                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1650                                 break;
1651                         }
1652                 }
1653                 if ( ndel > 0 ) {
1654                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1655                         break;
1656                 }
1657                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1658                         j = i;
1659                         i++;
1660                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1661                         delcsn[0].bv_len = se->se_csn.bv_len;
1662                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1663                 } else {
1664                         if ( se->se_tag == LDAP_REQ_ADD )
1665                                 continue;
1666                         nmods++;
1667                         j = num - nmods;
1668                 }
1669                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1670                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1671                 uuids[j].bv_len = UUID_LEN;
1672         }
1673         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1674
1675         ndel = i;
1676
1677         /* Zero out unused slots */
1678         for ( i=ndel; i < num - nmods; i++ )
1679                 uuids[i].bv_len = 0;
1680
1681         /* Mods must be validated to see if they belong in this delete set.
1682          */
1683
1684         mmods = nmods;
1685         /* Strip any duplicates */
1686         for ( i=0; i<nmods; i++ ) {
1687                 for ( j=0; j<ndel; j++ ) {
1688                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1689                                 uuids[num - 1 - i].bv_len = 0;
1690                                 mmods --;
1691                                 break;
1692                         }
1693                 }
1694                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1695                 for ( j=0; j<i; j++ ) {
1696                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1697                                 uuids[num - 1 - i].bv_len = 0;
1698                                 mmods --;
1699                                 break;
1700                         }
1701                 }
1702         }
1703
1704         if ( mmods ) {
1705                 Operation fop;
1706                 int rc;
1707                 Filter mf, af;
1708                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1709                 slap_callback cb = {0};
1710
1711                 fop = *op;
1712
1713                 fop.o_sync_mode = 0;
1714                 fop.o_callback = &cb;
1715                 fop.ors_limit = NULL;
1716                 fop.ors_tlimit = SLAP_NO_LIMIT;
1717                 fop.ors_attrs = slap_anlist_all_attributes;
1718                 fop.ors_attrsonly = 0;
1719                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1720
1721                 af.f_choice = LDAP_FILTER_AND;
1722                 af.f_next = NULL;
1723                 af.f_and = &mf;
1724                 mf.f_choice = LDAP_FILTER_EQUALITY;
1725                 mf.f_ava = &eq;
1726                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1727                 mf.f_next = fop.ors_filter;
1728
1729                 fop.ors_filter = &af;
1730
1731                 cb.sc_response = playlog_cb;
1732                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1733
1734                 for ( i=ndel; i<num; i++ ) {
1735                   if ( uuids[i].bv_len != 0 ) {
1736                         SlapReply frs = { REP_RESULT };
1737
1738                         mf.f_av_value = uuids[i];
1739                         cb.sc_private = NULL;
1740                         fop.ors_slimit = 1;
1741                         rc = fop.o_bd->be_search( &fop, &frs );
1742
1743                         /* If entry was not found, add to delete list */
1744                         if ( !cb.sc_private ) {
1745                                 uuids[ndel++] = uuids[i];
1746                         }
1747                   }
1748                 }
1749                 fop.o_bd->bd_info = (BackendInfo *)on;
1750         }
1751         if ( ndel ) {
1752                 struct berval cookie;
1753
1754                 if ( delcsn[0].bv_len ) {
1755                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1756                                 slap_serverID ? slap_serverID : -1 );
1757
1758                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1759                 }
1760
1761                 uuids[ndel].bv_val = NULL;
1762                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1763                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1764                 if ( delcsn[0].bv_len ) {
1765                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1766                 }
1767         }
1768         op->o_tmpfree( uuids, op->o_tmpmemctx );
1769 }
1770
1771 static int
1772 syncprov_op_response( Operation *op, SlapReply *rs )
1773 {
1774         opcookie *opc = op->o_callback->sc_private;
1775         slap_overinst *on = opc->son;
1776         syncprov_info_t         *si = on->on_bi.bi_private;
1777         syncmatches *sm;
1778
1779         if ( rs->sr_err == LDAP_SUCCESS )
1780         {
1781                 struct berval maxcsn;
1782                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1783                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1784
1785                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1786
1787                 /* Update our context CSN */
1788                 cbuf[0] = '\0';
1789                 maxcsn.bv_val = cbuf;
1790                 maxcsn.bv_len = sizeof(cbuf);
1791                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1792
1793                 slap_get_commit_csn( op, &maxcsn, &foundit );
1794                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1795                         /* syncrepl queues the CSN values in the db where
1796                          * it is configured , not where the changes are made.
1797                          * So look for a value in the glue db if we didn't
1798                          * find any in this db.
1799                          */
1800                         BackendDB *be = op->o_bd;
1801                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1802                         maxcsn.bv_val = cbuf;
1803                         maxcsn.bv_len = sizeof(cbuf);
1804                         slap_get_commit_csn( op, &maxcsn, &foundit );
1805                         op->o_bd = be;
1806                 }
1807                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1808                         int i, sid;
1809 #ifdef CHECK_CSN
1810                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1811                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1812 #endif
1813                         sid = slap_parse_csn_sid( &maxcsn );
1814                         for ( i=0; i<si->si_numcsns; i++ ) {
1815                                 if ( sid < si->si_sids[i] )
1816                                         break;
1817                                 if ( sid == si->si_sids[i] ) {
1818                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1819                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1820                                                 csn_changed = 1;
1821                                         }
1822                                         break;
1823                                 }
1824                         }
1825                         /* It's a new SID for us */
1826                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1827                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1828                                         i, sid, &maxcsn );
1829                                 csn_changed = 1;
1830                         }
1831                 }
1832
1833                 /* Don't do any processing for consumer contextCSN updates */
1834                 if ( op->o_dont_replicate ) {
1835                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1836                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1837                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1838                         /* Catch contextCSN updates from syncrepl. We have to look at
1839                          * all the attribute values, as there may be more than one csn
1840                          * that changed, and only one can be passed in the csn queue.
1841                          */
1842                         Modifications *mod = op->orm_modlist;
1843                         unsigned i;
1844                         int j, sid;
1845
1846                         for ( i=0; i<mod->sml_numvals; i++ ) {
1847                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1848                                 for ( j=0; j<si->si_numcsns; j++ ) {
1849                                         if ( sid < si->si_sids[j] )
1850                                                 break;
1851                                         if ( sid == si->si_sids[j] ) {
1852                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1853                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1854                                                         csn_changed = 1;
1855                                                 }
1856                                                 break;
1857                                         }
1858                                 }
1859
1860                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1861                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1862                                                 j, sid, &mod->sml_values[i] );
1863                                         csn_changed = 1;
1864                                 }
1865                         }
1866                         if ( csn_changed )
1867                                 si->si_dirty = 0;
1868                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1869
1870                         if ( csn_changed ) {
1871                                 syncops *ss;
1872                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1873                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1874                                         if ( ss->s_op->o_abandon )
1875                                                 continue;
1876                                         /* Send the updated csn to all syncrepl consumers,
1877                                          * including the server from which it originated.
1878                                          * The syncrepl consumer and syncprov provider on
1879                                          * the originating server may be configured to store
1880                                          * their csn values in different entries.
1881                                          */
1882                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1883                                 }
1884                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1885                         }
1886                         } else {
1887                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1888                         }
1889                         goto leave;
1890                 }
1891
1892                 si->si_numops++;
1893                 if ( si->si_chkops || si->si_chktime ) {
1894                         /* Never checkpoint adding the context entry,
1895                          * it will deadlock
1896                          */
1897                         if ( op->o_tag != LDAP_REQ_ADD ||
1898                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1899                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1900                                         do_check = 1;
1901                                         si->si_numops = 0;
1902                                 }
1903                                 if ( si->si_chktime &&
1904                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1905                                         if ( si->si_chklast ) {
1906                                                 do_check = 1;
1907                                                 si->si_chklast = op->o_time;
1908                                         } else {
1909                                                 si->si_chklast = 1;
1910                                         }
1911                                 }
1912                         }
1913                 }
1914                 si->si_dirty = !csn_changed;
1915                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1916
1917                 if ( do_check ) {
1918                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1919                         syncprov_checkpoint( op, on );
1920                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1921                 }
1922
1923                 /* only update consumer ctx if this is a newer csn */
1924                 if ( csn_changed ) {
1925                         opc->sctxcsn = maxcsn;
1926                 }
1927
1928                 /* Handle any persistent searches */
1929                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1930                 have_psearches = ( si->si_ops != NULL );
1931                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1932                 if ( have_psearches ) {
1933                         switch(op->o_tag) {
1934                         case LDAP_REQ_ADD:
1935                         case LDAP_REQ_MODIFY:
1936                         case LDAP_REQ_MODRDN:
1937                         case LDAP_REQ_EXTENDED:
1938                                 syncprov_matchops( op, opc, 0 );
1939                                 break;
1940                         case LDAP_REQ_DELETE:
1941                                 /* for each match in opc->smatches:
1942                                  *   send DELETE msg
1943                                  */
1944                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1945                                         if ( sm->sm_op->s_op->o_abandon )
1946                                                 continue;
1947                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1948                                 }
1949                                 break;
1950                         }
1951                 }
1952
1953                 /* Add any log records */
1954                 if ( si->si_logs ) {
1955                         syncprov_add_slog( op );
1956                 }
1957 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1958         }
1959         return SLAP_CB_CONTINUE;
1960 }
1961
1962 /* We don't use a subentry to store the context CSN any more.
1963  * We expose the current context CSN as an operational attribute
1964  * of the suffix entry.
1965  */
1966 static int
1967 syncprov_op_compare( Operation *op, SlapReply *rs )
1968 {
1969         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1970         syncprov_info_t         *si = on->on_bi.bi_private;
1971         int rc = SLAP_CB_CONTINUE;
1972
1973         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1974                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1975         {
1976                 Entry e = {0};
1977                 Attribute a = {0};
1978
1979                 e.e_name = si->si_contextdn;
1980                 e.e_nname = si->si_contextdn;
1981                 e.e_attrs = &a;
1982
1983                 a.a_desc = slap_schema.si_ad_contextCSN;
1984
1985                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1986
1987                 a.a_vals = si->si_ctxcsn;
1988                 a.a_nvals = a.a_vals;
1989                 a.a_numvals = si->si_numcsns;
1990
1991                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1992                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1993                 if ( ! rs->sr_err ) {
1994                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1995                         goto return_results;
1996                 }
1997
1998                 if ( get_assert( op ) &&
1999                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2000                 {
2001                         rs->sr_err = LDAP_ASSERTION_FAILED;
2002                         goto return_results;
2003                 }
2004
2005
2006                 rs->sr_err = LDAP_COMPARE_FALSE;
2007
2008                 if ( attr_valfind( &a,
2009                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2010                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2011                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2012                 {
2013                         rs->sr_err = LDAP_COMPARE_TRUE;
2014                 }
2015
2016 return_results:;
2017
2018                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2019
2020                 send_ldap_result( op, rs );
2021
2022                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2023                         rs->sr_err = LDAP_SUCCESS;
2024                 }
2025                 rc = rs->sr_err;
2026         }
2027
2028         return rc;
2029 }
2030
2031 static int
2032 syncprov_op_mod( Operation *op, SlapReply *rs )
2033 {
2034         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2035         syncprov_info_t         *si = on->on_bi.bi_private;
2036         slap_callback *cb;
2037         opcookie *opc;
2038         int have_psearches, cbsize;
2039
2040         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2041         have_psearches = ( si->si_ops != NULL );
2042         si->si_active++;
2043         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2044
2045         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2046                 (have_psearches ? sizeof(modinst) : 0 );
2047
2048         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2049         opc = (opcookie *)(cb+1);
2050         opc->son = on;
2051         cb->sc_response = syncprov_op_response;
2052         cb->sc_cleanup = syncprov_op_cleanup;
2053         cb->sc_private = opc;
2054         cb->sc_next = op->o_callback;
2055         op->o_callback = cb;
2056
2057         opc->osid = -1;
2058         opc->rsid = -1;
2059         if ( op->o_csn.bv_val ) {
2060                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2061         }
2062         if ( op->o_controls ) {
2063                 struct sync_cookie *scook =
2064                 op->o_controls[slap_cids.sc_LDAPsync];
2065                 if ( scook )
2066                         opc->rsid = scook->sid;
2067         }
2068
2069         if ( op->o_dont_replicate )
2070                 return SLAP_CB_CONTINUE;
2071
2072         /* If there are active persistent searches, lock this operation.
2073          * See seqmod.c for the locking logic on its own.
2074          */
2075         if ( have_psearches ) {
2076                 modtarget *mt, mtdummy;
2077                 modinst *mi;
2078
2079                 mi = (modinst *)(opc+1);
2080                 mi->mi_op = op;
2081
2082                 /* See if we're already modifying this entry... */
2083                 mtdummy.mt_dn = op->o_req_ndn;
2084                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2085                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2086                 if ( mt ) {
2087                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2088                         if ( mt->mt_mods == NULL ) {
2089                                 /* Cannot reuse this mt, as another thread is about
2090                                  * to release it in syncprov_op_cleanup.
2091                                  */
2092                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2093                                 mt = NULL;
2094                         }
2095                 }
2096                 if ( mt ) {
2097                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2098                         mt->mt_tail->mi_next = mi;
2099                         mt->mt_tail = mi;
2100                         /* wait for this op to get to head of list */
2101                         while ( mt->mt_mods != mi ) {
2102                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2103                                 /* FIXME: if dynamic config can delete overlays or
2104                                  * databases we'll have to check for cleanup here.
2105                                  * Currently it's not an issue because there are
2106                                  * no dynamic config deletes...
2107                                  */
2108                                 if ( slapd_shutdown )
2109                                         return SLAPD_ABANDON;
2110
2111                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2112                                         ldap_pvt_thread_yield();
2113                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2114
2115                                 /* clean up if the caller is giving up */
2116                                 if ( op->o_abandon ) {
2117                                         modinst *m2;
2118                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2119                                                 m2 = m2->mi_next );
2120                                         if ( m2 ) {
2121                                                 m2->mi_next = mi->mi_next;
2122                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2123                                         }
2124                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2125                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2126                                         return SLAPD_ABANDON;
2127                                 }
2128                         }
2129                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2130                 } else {
2131                         /* Record that we're modifying this entry now */
2132                         mt = ch_malloc( sizeof(modtarget) );
2133                         mt->mt_mods = mi;
2134                         mt->mt_tail = mi;
2135                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2136                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2137                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2138                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2139                 }
2140                 opc->smt = mt;
2141         }
2142
2143         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2144                 syncprov_matchops( op, opc, 1 );
2145
2146         return SLAP_CB_CONTINUE;
2147 }
2148
2149 static int
2150 syncprov_op_extended( Operation *op, SlapReply *rs )
2151 {
2152         if ( exop_is_write( op ))
2153                 return syncprov_op_mod( op, rs );
2154
2155         return SLAP_CB_CONTINUE;
2156 }
2157
2158 typedef struct searchstate {
2159         slap_overinst *ss_on;
2160         syncops *ss_so;
2161         BerVarray ss_ctxcsn;
2162         int *ss_sids;
2163         int ss_numcsns;
2164 #define SS_PRESENT      0x01
2165 #define SS_CHANGED      0x02
2166         int ss_flags;
2167 } searchstate;
2168
2169 typedef struct SyncOperationBuffer {
2170         Operation               sob_op;
2171         Opheader                sob_hdr;
2172         OpExtra                 sob_oe;
2173         AttributeName   sob_extra;      /* not always present */
2174         /* Further data allocated here */
2175 } SyncOperationBuffer;
2176
2177 static void
2178 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2179 {
2180         SyncOperationBuffer *sopbuf2;
2181         Operation *op2;
2182         int i, alen = 0;
2183         size_t size;
2184         char *ptr;
2185         GroupAssertion *g1, *g2;
2186
2187         /* count the search attrs */
2188         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2189                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2190         }
2191         /* Make a new copy of the operation */
2192         size = offsetof( SyncOperationBuffer, sob_extra ) +
2193                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2194                 op->o_req_dn.bv_len + 1 +
2195                 op->o_req_ndn.bv_len + 1 +
2196                 op->o_ndn.bv_len + 1 +
2197                 so->s_filterstr.bv_len + 1;
2198         sopbuf2 = ch_calloc( 1, size );
2199         op2 = &sopbuf2->sob_op;
2200         op2->o_hdr = &sopbuf2->sob_hdr;
2201         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2202
2203         /* Copy the fields we care about explicitly, leave the rest alone */
2204         *op2->o_hdr = *op->o_hdr;
2205         op2->o_tag = op->o_tag;
2206         op2->o_time = op->o_time;
2207         op2->o_bd = on->on_info->oi_origdb;
2208         op2->o_request = op->o_request;
2209         op2->o_managedsait = op->o_managedsait;
2210         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2211         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2212
2213         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2214         if ( i ) {
2215                 op2->ors_attrs = (AttributeName *) ptr;
2216                 ptr = (char *) &op2->ors_attrs[i+1];
2217                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2218                         op2->ors_attrs[i] = op->ors_attrs[i];
2219                         op2->ors_attrs[i].an_name.bv_val = ptr;
2220                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2221                 }
2222                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2223         }
2224
2225         op2->o_authz = op->o_authz;
2226         op2->o_ndn.bv_val = ptr;
2227         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2228         op2->o_dn = op2->o_ndn;
2229         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2230         op2->o_req_dn.bv_val = ptr;
2231         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2232         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2233         op2->o_req_ndn.bv_val = ptr;
2234         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2235         op2->ors_filterstr.bv_val = ptr;
2236         strcpy( ptr, so->s_filterstr.bv_val );
2237         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2238
2239         /* Skip the AND/GE clause that we stuck on in front */
2240         if ( so->s_flags & PS_FIX_FILTER ) {
2241                 op2->ors_filter = op->ors_filter->f_and->f_next;
2242                 so->s_flags ^= PS_FIX_FILTER;
2243         } else {
2244                 op2->ors_filter = op->ors_filter;
2245         }
2246         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2247         so->s_op = op2;
2248
2249         /* Copy any cached group ACLs individually */
2250         op2->o_groups = NULL;
2251         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2252                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2253                 *g2 = *g1;
2254                 strcpy( g2->ga_ndn, g1->ga_ndn );
2255                 g2->ga_next = op2->o_groups;
2256                 op2->o_groups = g2;
2257         }
2258         /* Don't allow any further group caching */
2259         op2->o_do_not_cache = 1;
2260
2261         /* Add op2 to conn so abandon will find us */
2262         op->o_conn->c_n_ops_executing++;
2263         op->o_conn->c_n_ops_completed--;
2264         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2265         so->s_flags |= PS_IS_DETACHED;
2266
2267         /* Prevent anyone else from trying to send a result for this op */
2268         op->o_abandon = 1;
2269 }
2270
2271 static int
2272 syncprov_search_response( Operation *op, SlapReply *rs )
2273 {
2274         searchstate *ss = op->o_callback->sc_private;
2275         slap_overinst *on = ss->ss_on;
2276         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2277         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2278
2279         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2280                 Attribute *a;
2281                 /* If we got a referral without a referral object, there's
2282                  * something missing that we cannot replicate. Just ignore it.
2283                  * The consumer will abort because we didn't send the expected
2284                  * control.
2285                  */
2286                 if ( !rs->sr_entry ) {
2287                         assert( rs->sr_entry != NULL );
2288                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2289                         return SLAP_CB_CONTINUE;
2290                 }
2291                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2292                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2293                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2294                 }
2295                 if ( a ) {
2296                         int i, sid;
2297                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2298
2299                         /* Don't send changed entries back to the originator */
2300                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2301                                 Debug( LDAP_DEBUG_SYNC,
2302                                         "Entry %s changed by peer, ignored\n",
2303                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2304                                 return LDAP_SUCCESS;
2305                         }
2306
2307                         /* If not a persistent search */
2308                         if ( !ss->ss_so ) {
2309                                 /* Make sure entry is less than the snapshot'd contextCSN */
2310                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2311                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2312                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2313                                                 Debug( LDAP_DEBUG_SYNC,
2314                                                         "Entry %s CSN %s greater than snapshot %s\n",
2315                                                         rs->sr_entry->e_name.bv_val,
2316                                                         a->a_nvals[0].bv_val,
2317                                                         ss->ss_ctxcsn[i].bv_val );
2318                                                 return LDAP_SUCCESS;
2319                                         }
2320                                 }
2321                         }
2322
2323                         /* Don't send old entries twice */
2324                         if ( srs->sr_state.ctxcsn ) {
2325                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2326                                         if ( sid == srs->sr_state.sids[i] &&
2327                                                 ber_bvcmp( &a->a_nvals[0],
2328                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2329                                                 Debug( LDAP_DEBUG_SYNC,
2330                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2331                                                         rs->sr_entry->e_name.bv_val,
2332                                                         a->a_nvals[0].bv_val,
2333                                                         srs->sr_state.ctxcsn[i].bv_val );
2334                                                 return LDAP_SUCCESS;
2335                                         }
2336                                 }
2337                         }
2338                 }
2339                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2340                         op->o_tmpmemctx );
2341                 rs->sr_ctrls[1] = NULL;
2342                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2343                 /* If we're in delta-sync mode, always send a cookie */
2344                 if ( si->si_nopres && si->si_usehint && a ) {
2345                         struct berval cookie;
2346                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2347                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2348                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2349                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2350                 } else {
2351                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2352                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2353                 }
2354         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2355                 struct berval cookie = BER_BVNULL;
2356
2357                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2358                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2359                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2360                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2361
2362                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2363                 }
2364
2365                 /* Is this a regular refresh?
2366                  * Note: refresh never gets here if there were no changes
2367                  */
2368                 if ( !ss->ss_so ) {
2369                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2370                                 op->o_tmpmemctx );
2371                         rs->sr_ctrls[1] = NULL;
2372                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2373                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2374                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2375                                         LDAP_SYNC_REFRESH_DELETES );
2376                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2377                 } else {
2378                 /* It's RefreshAndPersist, transition to Persist phase */
2379                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2380                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2381                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2382                                 1, NULL, 0 );
2383                         if ( !BER_BVISNULL( &cookie ))
2384                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2385
2386                         /* Detach this Op from frontend control */
2387                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2388
2389                         /* But not if this connection was closed along the way */
2390                         if ( op->o_abandon ) {
2391                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2392                                 /* syncprov_ab_cleanup will free this syncop */
2393                                 return SLAPD_ABANDON;
2394
2395                         } else {
2396                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2397                                 /* Turn off the refreshing flag */
2398                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2399
2400                                 syncprov_detach_op( op, ss->ss_so, on );
2401
2402                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2403
2404                                 /* If there are queued responses, fire them off */
2405                                 if ( ss->ss_so->s_res )
2406                                         syncprov_qstart( ss->ss_so );
2407                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2408                         }
2409
2410                         return LDAP_SUCCESS;
2411                 }
2412         }
2413
2414         return SLAP_CB_CONTINUE;
2415 }
2416
2417 static int
2418 syncprov_op_search( Operation *op, SlapReply *rs )
2419 {
2420         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2421         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2422         slap_callback   *cb;
2423         int gotstate = 0, changed = 0, do_present = 0;
2424         syncops *sop = NULL;
2425         searchstate *ss;
2426         sync_control *srs;
2427         BerVarray ctxcsn;
2428         int i, *sids, numcsns;
2429         struct berval mincsn, maxcsn;
2430         int minsid, maxsid;
2431         int dirty = 0;
2432
2433         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2434
2435         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2436                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2437                 return rs->sr_err;
2438         }
2439
2440         srs = op->o_controls[slap_cids.sc_LDAPsync];
2441
2442         /* If this is a persistent search, set it up right away */
2443         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2444                 syncops so = {0};
2445                 fbase_cookie fc;
2446                 opcookie opc;
2447                 slap_callback sc;
2448
2449                 fc.fss = &so;
2450                 fc.fbase = 0;
2451                 so.s_eid = NOID;
2452                 so.s_op = op;
2453                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2454                 /* syncprov_findbase expects to be called as a callback... */
2455                 sc.sc_private = &opc;
2456                 opc.son = on;
2457                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2458                 cb = op->o_callback;
2459                 op->o_callback = &sc;
2460                 rs->sr_err = syncprov_findbase( op, &fc );
2461                 op->o_callback = cb;
2462                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2463
2464                 if ( rs->sr_err != LDAP_SUCCESS ) {
2465                         send_ldap_result( op, rs );
2466                         return rs->sr_err;
2467                 }
2468                 sop = ch_malloc( sizeof( syncops ));
2469                 *sop = so;
2470                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2471                 sop->s_rid = srs->sr_state.rid;
2472                 sop->s_sid = srs->sr_state.sid;
2473                 /* set refcount=2 to prevent being freed out from under us
2474                  * by abandons that occur while we're running here
2475                  */
2476                 sop->s_inuse = 2;
2477
2478                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2479                 while ( si->si_active ) {
2480                         /* Wait for active mods to finish before proceeding, as they
2481                          * may already have inspected the si_ops list looking for
2482                          * consumers to replicate the change to.  Using the log
2483                          * doesn't help, as we may finish playing it before the
2484                          * active mods gets added to it.
2485                          */
2486                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2487                         if ( slapd_shutdown ) {
2488                                 ch_free( sop );
2489                                 return SLAPD_ABANDON;
2490                         }
2491                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2492                                 ldap_pvt_thread_yield();
2493                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2494                 }
2495                 sop->s_next = si->si_ops;
2496                 si->si_ops = sop;
2497                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2498         }
2499
2500         /* snapshot the ctxcsn */
2501         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2502         numcsns = si->si_numcsns;
2503         if ( numcsns ) {
2504                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2505                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2506                 for ( i=0; i<numcsns; i++ )
2507                         sids[i] = si->si_sids[i];
2508         } else {
2509                 ctxcsn = NULL;
2510                 sids = NULL;
2511         }
2512         dirty = si->si_dirty;
2513         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2514
2515         /* If we have a cookie, handle the PRESENT lookups */
2516         if ( srs->sr_state.ctxcsn ) {
2517                 sessionlog *sl;
2518                 int i, j;
2519
2520                 /* If we don't have any CSN of our own yet, pretend nothing
2521                  * has changed.
2522                  */
2523                 if ( !numcsns )
2524                         goto no_change;
2525
2526                 if ( !si->si_nopres )
2527                         do_present = SS_PRESENT;
2528
2529                 /* If there are SIDs we don't recognize in the cookie, drop them */
2530                 for (i=0; i<srs->sr_state.numcsns; ) {
2531                         for (j=i; j<numcsns; j++) {
2532                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2533                                         break;
2534                                 }
2535                         }
2536                         /* not found */
2537                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2538                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2539                                 srs->sr_state.numcsns--;
2540                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2541                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2542                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2543                                 }
2544                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2545                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2546                                 continue;
2547                         }
2548                         i++;
2549                 }
2550
2551                 if (srs->sr_state.numcsns != numcsns) {
2552                         /* consumer doesn't have the right number of CSNs */
2553                         changed = SS_CHANGED;
2554                         if ( srs->sr_state.ctxcsn ) {
2555                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2556                                 srs->sr_state.ctxcsn = NULL;
2557                         }
2558                         if ( srs->sr_state.sids ) {
2559                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2560                                 srs->sr_state.sids = NULL;
2561                         }
2562                         srs->sr_state.numcsns = 0;
2563                         goto shortcut;
2564                 }
2565
2566                 /* Find the smallest CSN which differs from contextCSN */
2567                 mincsn.bv_len = 0;
2568                 maxcsn.bv_len = 0;
2569                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2570                         int newer;
2571                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2572                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2573                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2574                                 maxcsn = srs->sr_state.ctxcsn[i];
2575                                 maxsid = sids[j];
2576                         }
2577                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2578                         /* If our state is newer, tell consumer about changes */
2579                         if ( newer < 0) {
2580                                 changed = SS_CHANGED;
2581                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2582                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2583                                         mincsn = srs->sr_state.ctxcsn[i];
2584                                         minsid = sids[j];
2585                                 }
2586                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2587                         /* our state is older, complain to consumer */
2588                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2589                                 rs->sr_text = "consumer state is newer than provider!";
2590 bailout:
2591                                 if ( sop ) {
2592                                         syncops **sp = &si->si_ops;
2593
2594                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2595                                         while ( *sp != sop )
2596                                                 sp = &(*sp)->s_next;
2597                                         *sp = sop->s_next;
2598                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2599                                         ch_free( sop );
2600                                 }
2601                                 rs->sr_ctrls = NULL;
2602                                 send_ldap_result( op, rs );
2603                                 return rs->sr_err;
2604                         }
2605                 }
2606                 if ( BER_BVISEMPTY( &mincsn )) {
2607                         mincsn = maxcsn;
2608                         minsid = maxsid;
2609                 }
2610
2611                 /* If nothing has changed, shortcut it */
2612                 if ( !changed && !dirty ) {
2613                         do_present = 0;
2614 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2615                                 LDAPControl     *ctrls[2];
2616
2617                                 ctrls[0] = NULL;
2618                                 ctrls[1] = NULL;
2619                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2620                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2621                                 rs->sr_ctrls = ctrls;
2622                                 rs->sr_err = LDAP_SUCCESS;
2623                                 send_ldap_result( op, rs );
2624                                 rs->sr_ctrls = NULL;
2625                                 return rs->sr_err;
2626                         }
2627                         goto shortcut;
2628                 }
2629
2630                 /* Do we have a sessionlog for this search? */
2631                 sl=si->si_logs;
2632                 if ( sl ) {
2633                         int do_play = 0;
2634                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2635                         /* Are there any log entries, and is the consumer state
2636                          * present in the session log?
2637                          */
2638                         if ( sl->sl_num > 0 ) {
2639                                 int i;
2640                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2641                                         /* SID not present == new enough */
2642                                         if ( minsid < sl->sl_sids[i] ) {
2643                                                 do_play = 1;
2644                                                 break;
2645                                         }
2646                                         /* SID present */
2647                                         if ( minsid == sl->sl_sids[i] ) {
2648                                                 /* new enough? */
2649                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2650                                                         do_play = 1;
2651                                                 break;
2652                                         }
2653                                 }
2654                                 /* SID not present == new enough */
2655                                 if ( i == sl->sl_numcsns )
2656                                         do_play = 1;
2657                         }
2658                         if ( do_play ) {
2659                                 do_present = 0;
2660                                 /* mutex is unlocked in playlog */
2661                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2662                         } else {
2663                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2664                         }
2665                 }
2666                 /* Is the CSN still present in the database? */
2667                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2668                         /* No, so a reload is required */
2669                         /* the 2.2 consumer doesn't send this hint */
2670                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2671                                 if ( ctxcsn )
2672                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2673                                 if ( sids )
2674                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2675                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2676                                 rs->sr_text = "sync cookie is stale";
2677                                 goto bailout;
2678                         }
2679                         if ( srs->sr_state.ctxcsn ) {
2680                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2681                                 srs->sr_state.ctxcsn = NULL;
2682                         }
2683                         if ( srs->sr_state.sids ) {
2684                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2685                                 srs->sr_state.sids = NULL;
2686                         }
2687                         srs->sr_state.numcsns = 0;
2688                 } else {
2689                         gotstate = 1;
2690                         /* If changed and doing Present lookup, send Present UUIDs */
2691                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2692                                 LDAP_SUCCESS ) {
2693                                 if ( ctxcsn )
2694                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2695                                 if ( sids )
2696                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2697                                 goto bailout;
2698                         }
2699                 }
2700         } else {
2701                 /* No consumer state, assume something has changed */
2702                 changed = SS_CHANGED;
2703         }
2704
2705 shortcut:
2706         /* Append CSN range to search filter, save original filter
2707          * for persistent search evaluation
2708          */
2709         if ( sop ) {
2710                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2711                 sop->s_filterstr = op->ors_filterstr;
2712                 /* correct the refcount that was set to 2 before */
2713                 sop->s_inuse--;
2714         }
2715
2716         /* If something changed, find the changes */
2717         if ( gotstate && ( changed || dirty ) ) {
2718                 Filter *fand, *fava;
2719
2720                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2721                 fand->f_choice = LDAP_FILTER_AND;
2722                 fand->f_next = NULL;
2723                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2724                 fand->f_and = fava;
2725                 fava->f_choice = LDAP_FILTER_GE;
2726                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2727                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2728 #ifdef LDAP_COMP_MATCH
2729                 fava->f_ava->aa_cf = NULL;
2730 #endif
2731                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2732                 fava->f_next = op->ors_filter;
2733                 op->ors_filter = fand;
2734                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2735                 if ( sop ) {
2736                         sop->s_flags |= PS_FIX_FILTER;
2737                 }
2738         }
2739         if ( sop ) {
2740                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2741         }
2742
2743         /* Let our callback add needed info to returned entries */
2744         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2745         ss = (searchstate *)(cb+1);
2746         ss->ss_on = on;
2747         ss->ss_so = sop;
2748         ss->ss_flags = do_present | changed;
2749         ss->ss_ctxcsn = ctxcsn;
2750         ss->ss_numcsns = numcsns;
2751         ss->ss_sids = sids;
2752         cb->sc_response = syncprov_search_response;
2753         cb->sc_private = ss;
2754         cb->sc_next = op->o_callback;
2755         op->o_callback = cb;
2756
2757         /* If this is a persistent search and no changes were reported during
2758          * the refresh phase, just invoke the response callback to transition
2759          * us into persist phase
2760          */
2761         if ( !changed && !dirty ) {
2762                 rs->sr_err = LDAP_SUCCESS;
2763                 rs->sr_nentries = 0;
2764                 send_ldap_result( op, rs );
2765                 return rs->sr_err;
2766         }
2767         return SLAP_CB_CONTINUE;
2768 }
2769
2770 static int
2771 syncprov_operational(
2772         Operation *op,
2773         SlapReply *rs )
2774 {
2775         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2776         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2777
2778         /* This prevents generating unnecessarily; frontend will strip
2779          * any statically stored copy.
2780          */
2781         if ( op->o_sync != SLAP_CONTROL_NONE )
2782                 return SLAP_CB_CONTINUE;
2783
2784         if ( rs->sr_entry &&
2785                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2786
2787                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2788                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2789                         Attribute *a, **ap = NULL;
2790
2791                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2792                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2793                                         break;
2794                         }
2795
2796                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2797                         if ( si->si_ctxcsn ) {
2798                                 if ( !a ) {
2799                                         for ( ap = &rs->sr_operational_attrs; *ap;
2800                                                 ap=&(*ap)->a_next );
2801
2802                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2803                                         *ap = a;
2804                                 }
2805
2806                                 if ( !ap ) {
2807                                         if ( rs_entry2modifiable( op, rs, on )) {
2808                                                 a = attr_find( rs->sr_entry->e_attrs,
2809                                                         slap_schema.si_ad_contextCSN );
2810                                         }
2811                                         if ( a->a_nvals != a->a_vals ) {
2812                                                 ber_bvarray_free( a->a_nvals );
2813                                         }
2814                                         a->a_nvals = NULL;
2815                                         ber_bvarray_free( a->a_vals );
2816                                         a->a_vals = NULL;
2817                                         a->a_numvals = 0;
2818                                 }
2819                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2820                         }
2821                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2822                 }
2823         }
2824         return SLAP_CB_CONTINUE;
2825 }
2826
2827 enum {
2828         SP_CHKPT = 1,
2829         SP_SESSL,
2830         SP_NOPRES,
2831         SP_USEHINT
2832 };
2833
2834 static ConfigDriver sp_cf_gen;
2835
2836 static ConfigTable spcfg[] = {
2837         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2838                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2839                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2840                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2841         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2842                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2843                         "DESC 'Session log size in ops' "
2844                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2845         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2846                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2847                         "DESC 'Omit Present phase processing' "
2848                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2849         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2850                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2851                         "DESC 'Observe Reload Hint in Request control' "
2852                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2853         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2854 };
2855
2856 static ConfigOCs spocs[] = {
2857         { "( OLcfgOvOc:1.1 "
2858                 "NAME 'olcSyncProvConfig' "
2859                 "DESC 'SyncRepl Provider configuration' "
2860                 "SUP olcOverlayConfig "
2861                 "MAY ( olcSpCheckpoint "
2862                         "$ olcSpSessionlog "
2863                         "$ olcSpNoPresent "
2864                         "$ olcSpReloadHint "
2865                 ") )",
2866                         Cft_Overlay, spcfg },
2867         { NULL, 0, NULL }
2868 };
2869
2870 static int
2871 sp_cf_gen(ConfigArgs *c)
2872 {
2873         slap_overinst           *on = (slap_overinst *)c->bi;
2874         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2875         int rc = 0;
2876
2877         if ( c->op == SLAP_CONFIG_EMIT ) {
2878                 switch ( c->type ) {
2879                 case SP_CHKPT:
2880                         if ( si->si_chkops || si->si_chktime ) {
2881                                 struct berval bv;
2882                                 /* we assume si_chktime is a multiple of 60
2883                                  * because the parsed value was originally
2884                                  * multiplied by 60 */
2885                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2886                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2887                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2888                                         rc = 1;
2889                                 } else {
2890                                         bv.bv_val = c->cr_msg;
2891                                         value_add_one( &c->rvalue_vals, &bv );
2892                                 }
2893                         } else {
2894                                 rc = 1;
2895                         }
2896                         break;
2897                 case SP_SESSL:
2898                         if ( si->si_logs ) {
2899                                 c->value_int = si->si_logs->sl_size;
2900                         } else {
2901                                 rc = 1;
2902                         }
2903                         break;
2904                 case SP_NOPRES:
2905                         if ( si->si_nopres ) {
2906                                 c->value_int = 1;
2907                         } else {
2908                                 rc = 1;
2909                         }
2910                         break;
2911                 case SP_USEHINT:
2912                         if ( si->si_usehint ) {
2913                                 c->value_int = 1;
2914                         } else {
2915                                 rc = 1;
2916                         }
2917                         break;
2918                 }
2919                 return rc;
2920         } else if ( c->op == LDAP_MOD_DELETE ) {
2921                 switch ( c->type ) {
2922                 case SP_CHKPT:
2923                         si->si_chkops = 0;
2924                         si->si_chktime = 0;
2925                         break;
2926                 case SP_SESSL:
2927                         if ( si->si_logs )
2928                                 si->si_logs->sl_size = 0;
2929                         else
2930                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2931                         break;
2932                 case SP_NOPRES:
2933                         if ( si->si_nopres )
2934                                 si->si_nopres = 0;
2935                         else
2936                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2937                         break;
2938                 case SP_USEHINT:
2939                         if ( si->si_usehint )
2940                                 si->si_usehint = 0;
2941                         else
2942                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2943                         break;
2944                 }
2945                 return rc;
2946         }
2947         switch ( c->type ) {
2948         case SP_CHKPT:
2949                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2950                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2951                                 c->argv[0], c->argv[1] );
2952                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2953                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2954                         return ARG_BAD_CONF;
2955                 }
2956                 if ( si->si_chkops <= 0 ) {
2957                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2958                                 c->argv[0], si->si_chkops );
2959                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2960                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2961                         return ARG_BAD_CONF;
2962                 }
2963                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2964                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2965                                 c->argv[0], c->argv[1] );
2966                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2967                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2968                         return ARG_BAD_CONF;
2969                 }
2970                 if ( si->si_chktime <= 0 ) {
2971                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2972                                 c->argv[0], si->si_chkops );
2973                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2974                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2975                         return ARG_BAD_CONF;
2976                 }
2977                 si->si_chktime *= 60;
2978                 break;
2979         case SP_SESSL: {
2980                 sessionlog *sl;
2981                 int size = c->value_int;
2982
2983                 if ( size < 0 ) {
2984                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2985                                 c->argv[0], size );
2986                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2987                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2988                         return ARG_BAD_CONF;
2989                 }
2990                 sl = si->si_logs;
2991                 if ( !sl ) {
2992                         sl = ch_malloc( sizeof( sessionlog ));
2993                         sl->sl_mincsn = NULL;
2994                         sl->sl_sids = NULL;
2995                         sl->sl_num = 0;
2996                         sl->sl_numcsns = 0;
2997                         sl->sl_head = sl->sl_tail = NULL;
2998                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2999                         si->si_logs = sl;
3000                 }
3001                 sl->sl_size = size;
3002                 }
3003                 break;
3004         case SP_NOPRES:
3005                 si->si_nopres = c->value_int;
3006                 break;
3007         case SP_USEHINT:
3008                 si->si_usehint = c->value_int;
3009                 break;
3010         }
3011         return rc;
3012 }
3013
3014 /* ITS#3456 we cannot run this search on the main thread, must use a
3015  * child thread in order to insure we have a big enough stack.
3016  */
3017 static void *
3018 syncprov_db_otask(
3019         void *ptr
3020 )
3021 {
3022         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3023         return NULL;
3024 }
3025
3026
3027 /* Read any existing contextCSN from the underlying db.
3028  * Then search for any entries newer than that. If no value exists,
3029  * just generate it. Cache whatever result.
3030  */
3031 static int
3032 syncprov_db_open(
3033         BackendDB *be,
3034         ConfigReply *cr
3035 )
3036 {
3037         slap_overinst   *on = (slap_overinst *) be->bd_info;
3038         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3039
3040         Connection conn = { 0 };
3041         OperationBuffer opbuf;
3042         Operation *op;
3043         Entry *e = NULL;
3044         Attribute *a;
3045         int rc;
3046         void *thrctx = NULL;
3047
3048         if ( !SLAP_LASTMOD( be )) {
3049                 Debug( LDAP_DEBUG_ANY,
3050                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3051                 return -1;
3052         }
3053
3054         if ( slapMode & SLAP_TOOL_MODE ) {
3055                 return 0;
3056         }
3057
3058         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3059         if ( rc ) {
3060                 return rc;
3061         }
3062
3063         thrctx = ldap_pvt_thread_pool_context();
3064         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3065         op = &opbuf.ob_op;
3066         op->o_bd = be;
3067         op->o_dn = be->be_rootdn;
3068         op->o_ndn = be->be_rootndn;
3069
3070         if ( SLAP_SYNC_SUBENTRY( be )) {
3071                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3072                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3073         } else {
3074                 si->si_contextdn = be->be_nsuffix[0];
3075         }
3076         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3077                 slap_schema.si_ad_contextCSN, 0, &e, on );
3078
3079         if ( e ) {
3080                 ldap_pvt_thread_t tid;
3081
3082                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3083                 if ( a ) {
3084                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3085                         si->si_numcsns = a->a_numvals;
3086                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3087                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3088                 }
3089                 overlay_entry_release_ov( op, e, 0, on );
3090                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3091                         op->o_tag = LDAP_REQ_SEARCH;
3092                         op->o_req_dn = be->be_suffix[0];
3093                         op->o_req_ndn = be->be_nsuffix[0];
3094                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3095                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3096                         ldap_pvt_thread_join( tid, NULL );
3097                 }
3098         }
3099
3100         /* Didn't find a contextCSN, should we generate one? */
3101         if ( !si->si_ctxcsn ) {
3102                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3103                 struct berval csn;
3104
3105                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3106                 /* If we're also a consumer, then don't generate anything.
3107                  * Wait for our provider to send it to us, or for a local
3108                  * modify if we have multimaster.
3109                  */
3110                         goto out;
3111                 }
3112                 csn.bv_val = csnbuf;
3113                 csn.bv_len = sizeof( csnbuf );
3114                 slap_get_csn( op, &csn, 0 );
3115                 value_add_one( &si->si_ctxcsn, &csn );
3116                 si->si_numcsns = 1;
3117                 si->si_sids = ch_malloc( sizeof(int) );
3118                 si->si_sids[0] = slap_serverID;
3119
3120                 /* make sure we do a checkpoint on close */
3121                 si->si_numops++;
3122         }
3123
3124         /* Initialize the sessionlog mincsn */
3125         if ( si->si_logs && si->si_numcsns ) {
3126                 sessionlog *sl = si->si_logs;
3127                 int i;
3128                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3129                 sl->sl_numcsns = si->si_numcsns;
3130                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3131                 for ( i=0; i < si->si_numcsns; i++ )
3132                         sl->sl_sids[i] = si->si_sids[i];
3133         }
3134
3135 out:
3136         op->o_bd->bd_info = (BackendInfo *)on;
3137         return 0;
3138 }
3139
3140 /* Write the current contextCSN into the underlying db.
3141  */
3142 static int
3143 syncprov_db_close(
3144         BackendDB *be,
3145         ConfigReply *cr
3146 )
3147 {
3148     slap_overinst   *on = (slap_overinst *) be->bd_info;
3149     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3150 #ifdef SLAP_CONFIG_DELETE
3151         syncops *so, *sonext;
3152 #endif /* SLAP_CONFIG_DELETE */
3153
3154         if ( slapMode & SLAP_TOOL_MODE ) {
3155                 return 0;
3156         }
3157         if ( si->si_numops ) {
3158                 Connection conn = {0};
3159                 OperationBuffer opbuf;
3160                 Operation *op;
3161                 void *thrctx;
3162
3163                 thrctx = ldap_pvt_thread_pool_context();
3164                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3165                 op = &opbuf.ob_op;
3166                 op->o_bd = be;
3167                 op->o_dn = be->be_rootdn;
3168                 op->o_ndn = be->be_rootndn;
3169                 syncprov_checkpoint( op, on );
3170         }
3171
3172 #ifdef SLAP_CONFIG_DELETE
3173         if ( !slapd_shutdown ) {
3174                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3175                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3176                         SlapReply rs = {REP_RESULT};
3177                         rs.sr_err = LDAP_UNAVAILABLE;
3178                         send_ldap_result( so->s_op, &rs );
3179                         sonext=so->s_next;
3180                         syncprov_drop_psearch( so, 0);
3181                 }
3182                 si->si_ops=NULL;
3183                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3184         }
3185         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3186 #endif /* SLAP_CONFIG_DELETE */
3187
3188     return 0;
3189 }
3190
3191 static int
3192 syncprov_db_init(
3193         BackendDB *be,
3194         ConfigReply *cr
3195 )
3196 {
3197         slap_overinst   *on = (slap_overinst *)be->bd_info;
3198         syncprov_info_t *si;
3199
3200         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3201                 Debug( LDAP_DEBUG_ANY,
3202                         "syncprov must be instantiated within a database.\n",
3203                         0, 0, 0 );
3204                 return 1;
3205         }
3206
3207         si = ch_calloc(1, sizeof(syncprov_info_t));
3208         on->on_bi.bi_private = si;
3209         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3210         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3211         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3212         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3213
3214         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3215         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3216         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3217         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3218
3219         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3220         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3221
3222         return 0;
3223 }
3224
3225 static int
3226 syncprov_db_destroy(
3227         BackendDB *be,
3228         ConfigReply *cr
3229 )
3230 {
3231         slap_overinst   *on = (slap_overinst *)be->bd_info;
3232         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3233
3234         if ( si ) {
3235                 if ( si->si_logs ) {
3236                         sessionlog *sl = si->si_logs;
3237                         slog_entry *se = sl->sl_head;
3238
3239                         while ( se ) {
3240                                 slog_entry *se_next = se->se_next;
3241                                 ch_free( se );
3242                                 se = se_next;
3243                         }
3244                         if ( sl->sl_mincsn )
3245                                 ber_bvarray_free( sl->sl_mincsn );
3246                         if ( sl->sl_sids )
3247                                 ch_free( sl->sl_sids );
3248
3249                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3250                         ch_free( si->si_logs );
3251                 }
3252                 if ( si->si_ctxcsn )
3253                         ber_bvarray_free( si->si_ctxcsn );
3254                 if ( si->si_sids )
3255                         ch_free( si->si_sids );
3256                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3257                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3258                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3259                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3260                 ch_free( si );
3261         }
3262
3263         return 0;
3264 }
3265
3266 static int syncprov_parseCtrl (
3267         Operation *op,
3268         SlapReply *rs,
3269         LDAPControl *ctrl )
3270 {
3271         ber_tag_t tag;
3272         BerElementBuffer berbuf;
3273         BerElement *ber = (BerElement *)&berbuf;
3274         ber_int_t mode;
3275         ber_len_t len;
3276         struct berval cookie = BER_BVNULL;
3277         sync_control *sr;
3278         int rhint = 0;
3279
3280         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3281                 rs->sr_text = "Sync control specified multiple times";
3282                 return LDAP_PROTOCOL_ERROR;
3283         }
3284
3285         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3286                 rs->sr_text = "Sync control specified with pagedResults control";
3287                 return LDAP_PROTOCOL_ERROR;
3288         }
3289
3290         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3291                 rs->sr_text = "Sync control value is absent";
3292                 return LDAP_PROTOCOL_ERROR;
3293         }
3294
3295         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3296                 rs->sr_text = "Sync control value is empty";
3297                 return LDAP_PROTOCOL_ERROR;
3298         }
3299
3300         /* Parse the control value
3301          *      syncRequestValue ::= SEQUENCE {
3302          *              mode   ENUMERATED {
3303          *                      -- 0 unused
3304          *                      refreshOnly             (1),
3305          *                      -- 2 reserved
3306          *                      refreshAndPersist       (3)
3307          *              },
3308          *              cookie  syncCookie OPTIONAL
3309          *      }
3310          */
3311
3312         ber_init2( ber, &ctrl->ldctl_value, 0 );
3313
3314         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3315                 rs->sr_text = "Sync control : mode decoding error";
3316                 return LDAP_PROTOCOL_ERROR;
3317         }
3318
3319         switch( mode ) {
3320         case LDAP_SYNC_REFRESH_ONLY:
3321                 mode = SLAP_SYNC_REFRESH;
3322                 break;
3323         case LDAP_SYNC_REFRESH_AND_PERSIST:
3324                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3325                 break;
3326         default:
3327                 rs->sr_text = "Sync control : unknown update mode";
3328                 return LDAP_PROTOCOL_ERROR;
3329         }
3330
3331         tag = ber_peek_tag( ber, &len );
3332
3333         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3334                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3335                         rs->sr_text = "Sync control : cookie decoding error";
3336                         return LDAP_PROTOCOL_ERROR;
3337                 }
3338                 tag = ber_peek_tag( ber, &len );
3339         }
3340         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3341                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3342                         rs->sr_text = "Sync control : rhint decoding error";
3343                         return LDAP_PROTOCOL_ERROR;
3344                 }
3345         }
3346         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3347                         rs->sr_text = "Sync control : decoding error";
3348                         return LDAP_PROTOCOL_ERROR;
3349         }
3350         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3351         sr->sr_rhint = rhint;
3352         if (!BER_BVISNULL(&cookie)) {
3353                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3354                 /* If parse fails, pretend no cookie was sent */
3355                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3356                         sr->sr_state.rid == -1 ) {
3357                         if ( sr->sr_state.ctxcsn ) {
3358                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3359                                 sr->sr_state.ctxcsn = NULL;
3360                         }
3361                         sr->sr_state.numcsns = 0;
3362                 }
3363         }
3364
3365         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3366
3367         op->o_sync = ctrl->ldctl_iscritical
3368                 ? SLAP_CONTROL_CRITICAL
3369                 : SLAP_CONTROL_NONCRITICAL;
3370
3371         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3372
3373         return LDAP_SUCCESS;
3374 }
3375
3376 /* This overlay is set up for dynamic loading via moduleload. For static
3377  * configuration, you'll need to arrange for the slap_overinst to be
3378  * initialized and registered by some other function inside slapd.
3379  */
3380
3381 static slap_overinst            syncprov;
3382
3383 int
3384 syncprov_initialize()
3385 {
3386         int rc;
3387
3388         rc = register_supported_control( LDAP_CONTROL_SYNC,
3389                 SLAP_CTRL_SEARCH, NULL,
3390                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3391         if ( rc != LDAP_SUCCESS ) {
3392                 Debug( LDAP_DEBUG_ANY,
3393                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3394                 return rc;
3395         }
3396
3397         syncprov.on_bi.bi_type = "syncprov";
3398         syncprov.on_bi.bi_db_init = syncprov_db_init;
3399         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3400         syncprov.on_bi.bi_db_open = syncprov_db_open;
3401         syncprov.on_bi.bi_db_close = syncprov_db_close;
3402
3403         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3404         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3405
3406         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3407         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3408         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3409         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3410         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3411         syncprov.on_bi.bi_op_search = syncprov_op_search;
3412         syncprov.on_bi.bi_extended = syncprov_op_extended;
3413         syncprov.on_bi.bi_operational = syncprov_operational;
3414
3415         syncprov.on_bi.bi_cf_ocs = spocs;
3416
3417         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3418
3419         rc = config_register_schema( spcfg, spocs );
3420         if ( rc ) return rc;
3421
3422         return overlay_register( &syncprov );
3423 }
3424
3425 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3426 int
3427 init_module( int argc, char *argv[] )
3428 {
3429         return syncprov_initialize();
3430 }
3431 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3432
3433 #endif /* defined(SLAPD_OVER_SYNCPROV) */