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