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 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         struct berval mt_dn;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         BerVarray       sl_mincsn;
 117         int             *sl_sids;
 118         int             sl_numcsns;
 119         int             sl_num;
 120         int             sl_size;
 121         slog_entry *sl_head;
 122         slog_entry *sl_tail;
 123         ldap_pvt_thread_mutex_t sl_mutex;
 124 } sessionlog;
 125
 126 /* The main state for this overlay */
 127 typedef struct syncprov_info_t {
 128         syncops         *si_ops;
 129         struct berval   si_contextdn;
 130         BerVarray       si_ctxcsn;      /* ldapsync context */
 131         int             *si_sids;
 132         int             si_numcsns;
 133         int             si_chkops;      /* checkpointing info */
 134         int             si_chktime;
 135         int             si_numops;      /* number of ops since last checkpoint */
 136         int             si_nopres;      /* Skip present phase */
 137         int             si_usehint;     /* use reload hint */
 138         int             si_active;      /* True if there are active mods */
 139         int             si_dirty;       /* True if the context is dirty, i.e changes
 140                                                  * have been made without updating the csn. */
 141         time_t  si_chklast;     /* time of last checkpoint */
 142         Avlnode *si_mods;       /* entries being modified */
 143         sessionlog      *si_logs;
 144         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 145         ldap_pvt_thread_mutex_t si_ops_mutex;
 146         ldap_pvt_thread_mutex_t si_mods_mutex;
 147         ldap_pvt_thread_mutex_t si_resp_mutex;
 148 } syncprov_info_t;
 149
 150 typedef struct opcookie {
 151         slap_overinst *son;
 152         syncmatches *smatches;
 153         modtarget *smt;
 154         Entry *se;
 155         struct berval sdn;      /* DN of entry, for deletes */
 156         struct berval sndn;
 157         struct berval suuid;    /* UUID of entry */
 158         struct berval sctxcsn;
 159         short osid;     /* sid of op csn */
 160         short rsid;     /* sid of relay */
 161         short sreference;       /* Is the entry a reference? */
 162 } opcookie;
 163
 164 typedef struct mutexint {
 165         ldap_pvt_thread_mutex_t mi_mutex;
 166         int mi_int;
 167 } mutexint;
 168
 169 typedef struct fbase_cookie {
 170         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 171         syncops *fss;   /* persistent search we're testing against */
 172         int fbase;      /* if TRUE we found the search base and it's still valid */
 173         int fscope;     /* if TRUE then fdn is within the psearch scope */
 174 } fbase_cookie;
 175
 176 static AttributeName csn_anlist[3];
 177 static AttributeName uuid_anlist[2];
 178
 179 /* Build a LDAPsync intermediate state control */
 180 static int
 181 syncprov_state_ctrl(
 182         Operation       *op,
 183         SlapReply       *rs,
 184         Entry           *e,
 185         int             entry_sync_state,
 186         LDAPControl     **ctrls,
 187         int             num_ctrls,
 188         int             send_cookie,
 189         struct berval   *cookie )
 190 {
 191         Attribute* a;
 192         int ret;
 193
 194         BerElementBuffer berbuf;
 195         BerElement *ber = (BerElement *)&berbuf;
 196         LDAPControl *cp;
 197         struct berval bv;
 198         struct berval   entryuuid_bv = BER_BVNULL;
 199
 200         ber_init2( ber, 0, LBER_USE_DER );
 201         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 202
 203         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 204                 AttributeDescription *desc = a->a_desc;
 205                 if ( desc == slap_schema.si_ad_entryUUID ) {
 206                         entryuuid_bv = a->a_nvals[0];
 207                         break;
 208                 }
 209         }
 210
 211         /* FIXME: what if entryuuid is NULL or empty ? */
 212
 213         if ( send_cookie && cookie ) {
 214                 ber_printf( ber, "{eOON}",
 215                         entry_sync_state, &entryuuid_bv, cookie );
 216         } else {
 217                 ber_printf( ber, "{eON}",
 218                         entry_sync_state, &entryuuid_bv );
 219         }
 220
 221         ret = ber_flatten2( ber, &bv, 0 );
 222         if ( ret == 0 ) {
 223                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 224                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 225                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 226                 cp->ldctl_value.bv_val = (char *)&cp[1];
 227                 cp->ldctl_value.bv_len = bv.bv_len;
 228                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 229                 ctrls[num_ctrls] = cp;
 230         }
 231         ber_free_buf( ber );
 232
 233         if ( ret < 0 ) {
 234                 Debug( LDAP_DEBUG_TRACE,
 235                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 236                         ret, 0, 0 );
 237                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 238                 return LDAP_OTHER;
 239         }
 240
 241         return LDAP_SUCCESS;
 242 }
 243
 244 /* Build a LDAPsync final state control */
 245 static int
 246 syncprov_done_ctrl(
 247         Operation       *op,
 248         SlapReply       *rs,
 249         LDAPControl     **ctrls,
 250         int                     num_ctrls,
 251         int                     send_cookie,
 252         struct berval *cookie,
 253         int                     refreshDeletes )
 254 {
 255         int ret;
 256         BerElementBuffer berbuf;
 257         BerElement *ber = (BerElement *)&berbuf;
 258         LDAPControl *cp;
 259         struct berval bv;
 260
 261         ber_init2( ber, NULL, LBER_USE_DER );
 262         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 263
 264         ber_printf( ber, "{" );
 265         if ( send_cookie && cookie ) {
 266                 ber_printf( ber, "O", cookie );
 267         }
 268         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 269                 ber_printf( ber, "b", refreshDeletes );
 270         }
 271         ber_printf( ber, "N}" );
 272
 273         ret = ber_flatten2( ber, &bv, 0 );
 274         if ( ret == 0 ) {
 275                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 276                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 277                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 278                 cp->ldctl_value.bv_val = (char *)&cp[1];
 279                 cp->ldctl_value.bv_len = bv.bv_len;
 280                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 281                 ctrls[num_ctrls] = cp;
 282         }
 283
 284         ber_free_buf( ber );
 285
 286         if ( ret < 0 ) {
 287                 Debug( LDAP_DEBUG_TRACE,
 288                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 289                         ret, 0, 0 );
 290                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 291                 return LDAP_OTHER;
 292         }
 293
 294         return LDAP_SUCCESS;
 295 }
 296
 297 static int
 298 syncprov_sendinfo(
 299         Operation       *op,
 300         SlapReply       *rs,
 301         int                     type,
 302         struct berval *cookie,
 303         int                     refreshDone,
 304         BerVarray       syncUUIDs,
 305         int                     refreshDeletes )
 306 {
 307         BerElementBuffer berbuf;
 308         BerElement *ber = (BerElement *)&berbuf;
 309         struct berval rspdata;
 310
 311         int ret;
 312
 313         ber_init2( ber, NULL, LBER_USE_DER );
 314         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 315
 316         if ( type ) {
 317                 switch ( type ) {
 318                 case LDAP_TAG_SYNC_NEW_COOKIE:
 319                         ber_printf( ber, "tO", type, cookie );
 320                         break;
 321                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 322                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 323                         ber_printf( ber, "t{", type );
 324                         if ( cookie ) {
 325                                 ber_printf( ber, "O", cookie );
 326                         }
 327                         if ( refreshDone == 0 ) {
 328                                 ber_printf( ber, "b", refreshDone );
 329                         }
 330                         ber_printf( ber, "N}" );
 331                         break;
 332                 case LDAP_TAG_SYNC_ID_SET:
 333                         ber_printf( ber, "t{", type );
 334                         if ( cookie ) {
 335                                 ber_printf( ber, "O", cookie );
 336                         }
 337                         if ( refreshDeletes == 1 ) {
 338                                 ber_printf( ber, "b", refreshDeletes );
 339                         }
 340                         ber_printf( ber, "[W]", syncUUIDs );
 341                         ber_printf( ber, "N}" );
 342                         break;
 343                 default:
 344                         Debug( LDAP_DEBUG_TRACE,
 345                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 346                                 type, 0, 0 );
 347                         return LDAP_OTHER;
 348                 }
 349         }
 350
 351         ret = ber_flatten2( ber, &rspdata, 0 );
 352
 353         if ( ret < 0 ) {
 354                 Debug( LDAP_DEBUG_TRACE,
 355                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 356                         ret, 0, 0 );
 357                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 358                 return LDAP_OTHER;
 359         }
 360
 361         rs->sr_rspoid = LDAP_SYNC_INFO;
 362         rs->sr_rspdata = &rspdata;
 363         send_ldap_intermediate( op, rs );
 364         rs->sr_rspdata = NULL;
 365         ber_free_buf( ber );
 366
 367         return LDAP_SUCCESS;
 368 }
 369
 370 /* Find a modtarget in an AVL tree */
 371 static int
 372 sp_avl_cmp( const void *c1, const void *c2 )
 373 {
 374         const modtarget *m1, *m2;
 375         int rc;
 376
 377         m1 = c1; m2 = c2;
 378         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 379
 380         if ( rc ) return rc;
 381         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 382 }
 383
 384 /* syncprov_findbase:
 385  *   finds the true DN of the base of a search (with alias dereferencing) and
 386  * checks to make sure the base entry doesn't get replaced with a different
 387  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 388  * change is detected, any persistent search on this base must be terminated /
 389  * reloaded.
 390  *   On the first call, we just save the DN and entryID. On subsequent calls
 391  * we compare the DN and entryID with the saved values.
 392  */
 393 static int
 394 findbase_cb( Operation *op, SlapReply *rs )
 395 {
 396         slap_callback *sc = op->o_callback;
 397
 398         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 399                 fbase_cookie *fc = sc->sc_private;
 400
 401                 /* If no entryID, we're looking for the first time.
 402                  * Just store whatever we got.
 403                  */
 404                 if ( fc->fss->s_eid == NOID ) {
 405                         fc->fbase = 2;
 406                         fc->fss->s_eid = rs->sr_entry->e_id;
 407                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 408
 409                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 410                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 411
 412                 /* OK, the DN is the same and the entryID is the same. */
 413                         fc->fbase = 1;
 414                 }
 415         }
 416         if ( rs->sr_err != LDAP_SUCCESS ) {
 417                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 418         }
 419         return LDAP_SUCCESS;
 420 }
 421
 422 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 423 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 424
 425 static int
 426 syncprov_findbase( Operation *op, fbase_cookie *fc )
 427 {
 428         /* Use basic parameters from syncrepl search, but use
 429          * current op's threadctx / tmpmemctx
 430          */
 431         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 432         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 433                 slap_callback cb = {0};
 434                 Operation fop;
 435                 SlapReply frs = { REP_RESULT };
 436                 int rc;
 437
 438                 fc->fss->s_flags ^= PS_FIND_BASE;
 439                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 440
 441                 fop = *fc->fss->s_op;
 442
 443                 fop.o_bd = fop.o_bd->bd_self;
 444                 fop.o_hdr = op->o_hdr;
 445                 fop.o_time = op->o_time;
 446                 fop.o_tincr = op->o_tincr;
 447                 fop.o_extra = op->o_extra;
 448
 449                 cb.sc_response = findbase_cb;
 450                 cb.sc_private = fc;
 451
 452                 fop.o_sync_mode = 0;    /* turn off sync mode */
 453                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 454                 fop.o_callback = &cb;
 455                 fop.o_tag = LDAP_REQ_SEARCH;
 456                 fop.ors_scope = LDAP_SCOPE_BASE;
 457                 fop.ors_limit = NULL;
 458                 fop.ors_slimit = 1;
 459                 fop.ors_tlimit = SLAP_NO_LIMIT;
 460                 fop.ors_attrs = slap_anlist_no_attrs;
 461                 fop.ors_attrsonly = 1;
 462                 fop.ors_filter = &generic_filter;
 463                 fop.ors_filterstr = generic_filterstr;
 464
 465                 rc = fop.o_bd->be_search( &fop, &frs );
 466         } else {
 467                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 468                 fc->fbase = 1;
 469         }
 470
 471         /* After the first call, see if the fdn resides in the scope */
 472         if ( fc->fbase == 1 ) {
 473                 switch ( fc->fss->s_op->ors_scope ) {
 474                 case LDAP_SCOPE_BASE:
 475                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 476                         break;
 477                 case LDAP_SCOPE_ONELEVEL: {
 478                         struct berval pdn;
 479                         dnParent( fc->fdn, &pdn );
 480                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 481                         break; }
 482                 case LDAP_SCOPE_SUBTREE:
 483                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 484                         break;
 485                 case LDAP_SCOPE_SUBORDINATE:
 486                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 487                                 !dn_match( fc->fdn, &fc->fss->s_base );
 488                         break;
 489                 }
 490         }
 491
 492         if ( fc->fbase )
 493                 return LDAP_SUCCESS;
 494
 495         /* If entryID has changed, then the base of this search has
 496          * changed. Invalidate the psearch.
 497          */
 498         return LDAP_NO_SUCH_OBJECT;
 499 }
 500
 501 /* syncprov_findcsn:
 502  *   This function has three different purposes, but they all use a search
 503  * that filters on entryCSN so they're combined here.
 504  * 1: at startup time, after a contextCSN has been read from the database,
 505  * we search for all entries with CSN >= contextCSN in case the contextCSN
 506  * was not checkpointed at the previous shutdown.
 507  *
 508  * 2: when the current contextCSN is known and we have a sync cookie, we search
 509  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 510  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 511  *
 512  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 513  * CSN, and generate Present records for them. We always collect this result
 514  * in SyncID sets, even if there's only one match.
 515  */
 516 typedef enum find_csn_t {
 517         FIND_MAXCSN     = 1,
 518         FIND_CSN        = 2,
 519         FIND_PRESENT    = 3
 520 } find_csn_t;
 521
 522 static int
 523 findmax_cb( Operation *op, SlapReply *rs )
 524 {
 525         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 526                 struct berval *maxcsn = op->o_callback->sc_private;
 527                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 528                         slap_schema.si_ad_entryCSN );
 529
 530                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 531                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 532                         maxcsn->bv_len = a->a_vals[0].bv_len;
 533                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 534                 }
 535         }
 536         return LDAP_SUCCESS;
 537 }
 538
 539 static int
 540 findcsn_cb( Operation *op, SlapReply *rs )
 541 {
 542         slap_callback *sc = op->o_callback;
 543
 544         /* We just want to know that at least one exists, so it's OK if
 545          * we exceed the unchecked limit.
 546          */
 547         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 548                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 549                 sc->sc_private = (void *)1;
 550         }
 551         return LDAP_SUCCESS;
 552 }
 553
 554 /* Build a list of entryUUIDs for sending in a SyncID set */
 555
 556 #define UUID_LEN        16
 557
 558 typedef struct fpres_cookie {
 559         int num;
 560         BerVarray uuids;
 561         char *last;
 562 } fpres_cookie;
 563
 564 static int
 565 findpres_cb( Operation *op, SlapReply *rs )
 566 {
 567         slap_callback *sc = op->o_callback;
 568         fpres_cookie *pc = sc->sc_private;
 569         Attribute *a;
 570         int ret = SLAP_CB_CONTINUE;
 571
 572         switch ( rs->sr_type ) {
 573         case REP_SEARCH:
 574                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 575                 if ( a ) {
 576                         pc->uuids[pc->num].bv_val = pc->last;
 577                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 578                                 pc->uuids[pc->num].bv_len );
 579                         pc->num++;
 580                         pc->last = pc->uuids[pc->num].bv_val;
 581                         pc->uuids[pc->num].bv_val = NULL;
 582                 }
 583                 ret = LDAP_SUCCESS;
 584                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 585                         break;
 586                 /* FALLTHRU */
 587         case REP_RESULT:
 588                 ret = rs->sr_err;
 589                 if ( pc->num ) {
 590                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 591                                 0, pc->uuids, 0 );
 592                         pc->uuids[pc->num].bv_val = pc->last;
 593                         pc->num = 0;
 594                         pc->last = pc->uuids[0].bv_val;
 595                 }
 596                 break;
 597         default:
 598                 break;
 599         }
 600         return ret;
 601 }
 602
 603 static int
 604 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 605 {
 606         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 607         syncprov_info_t         *si = on->on_bi.bi_private;
 608
 609         slap_callback cb = {0};
 610         Operation fop;
 611         SlapReply frs = { REP_RESULT };
 612         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 613         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 614         struct berval maxcsn;
 615         Filter cf;
 616         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 617         fpres_cookie pcookie;
 618         sync_control *srs = NULL;
 619         struct slap_limits_set fc_limits;
 620         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 621         int maxid;
 622
 623         if ( mode != FIND_MAXCSN ) {
 624                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 625         }
 626
 627         fop = *op;
 628         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 629         /* We want pure entries, not referrals */
 630         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 631
 632         cf.f_ava = &eq;
 633         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 634         BER_BVZERO( &cf.f_av_value );
 635         cf.f_next = NULL;
 636
 637         fop.o_callback = &cb;
 638         fop.ors_limit = NULL;
 639         fop.ors_tlimit = SLAP_NO_LIMIT;
 640         fop.ors_filter = &cf;
 641         fop.ors_filterstr.bv_val = buf;
 642
 643 again:
 644         switch( mode ) {
 645         case FIND_MAXCSN:
 646                 cf.f_choice = LDAP_FILTER_GE;
 647                 /* If there are multiple CSNs, use the one with our serverID */
 648                 for ( i=0; i<si->si_numcsns; i++) {
 649                         if ( slap_serverID == si->si_sids[i] ) {
 650                                 maxid = i;
 651                                 break;
 652                         }
 653                 }
 654                 if ( i == si->si_numcsns ) {
 655                         /* No match: this is multimaster, and none of the content in the DB
 656                          * originated locally. Treat like no CSN.
 657                          */
 658                         return LDAP_NO_SUCH_OBJECT;
 659                 }
 660                 cf.f_av_value = si->si_ctxcsn[maxid];
 661                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 662                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 663                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 664                         return LDAP_OTHER;
 665                 }
 666                 fop.ors_attrsonly = 0;
 667                 fop.ors_attrs = csn_anlist;
 668                 fop.ors_slimit = SLAP_NO_LIMIT;
 669                 cb.sc_private = &maxcsn;
 670                 cb.sc_response = findmax_cb;
 671                 strcpy( cbuf, cf.f_av_value.bv_val );
 672                 maxcsn.bv_val = cbuf;
 673                 maxcsn.bv_len = cf.f_av_value.bv_len;
 674                 break;
 675         case FIND_CSN:
 676                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 677                         cf.f_av_value = *csn;
 678                 }
 679                 fop.o_dn = op->o_bd->be_rootdn;
 680                 fop.o_ndn = op->o_bd->be_rootndn;
 681                 fop.o_req_dn = op->o_bd->be_suffix[0];
 682                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 683                 /* Look for exact match the first time */
 684                 if ( findcsn_retry ) {
 685                         cf.f_choice = LDAP_FILTER_EQUALITY;
 686                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 687                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 688                 /* On retry, look for <= */
 689                 } else {
 690                         cf.f_choice = LDAP_FILTER_LE;
 691                         fop.ors_limit = &fc_limits;
 692                         memset( &fc_limits, 0, sizeof( fc_limits ));
 693                         fc_limits.lms_s_unchecked = 1;
 694                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 695                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 696                 }
 697                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 698                         return LDAP_OTHER;
 699                 }
 700                 fop.ors_attrsonly = 1;
 701                 fop.ors_attrs = slap_anlist_no_attrs;
 702                 fop.ors_slimit = 1;
 703                 cb.sc_private = NULL;
 704                 cb.sc_response = findcsn_cb;
 705                 break;
 706         case FIND_PRESENT:
 707                 fop.ors_filter = op->ors_filter;
 708                 fop.ors_filterstr = op->ors_filterstr;
 709                 fop.ors_attrsonly = 0;
 710                 fop.ors_attrs = uuid_anlist;
 711                 fop.ors_slimit = SLAP_NO_LIMIT;
 712                 cb.sc_private = &pcookie;
 713                 cb.sc_response = findpres_cb;
 714                 pcookie.num = 0;
 715
 716                 /* preallocate storage for a full set */
 717                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 718                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 719                         op->o_tmpmemctx );
 720                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 721                 pcookie.uuids[0].bv_val = pcookie.last;
 722                 pcookie.uuids[0].bv_len = UUID_LEN;
 723                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 724                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 725                         pcookie.uuids[i].bv_len = UUID_LEN;
 726                 }
 727                 break;
 728         }
 729
 730         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 731         fop.o_bd->be_search( &fop, &frs );
 732         fop.o_bd->bd_info = (BackendInfo *)on;
 733
 734         switch( mode ) {
 735         case FIND_MAXCSN:
 736                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 737 #ifdef CHECK_CSN
 738                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 739                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 740 #endif
 741                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 742                         si->si_numops++;        /* ensure a checkpoint */
 743                 }
 744                 break;
 745         case FIND_CSN:
 746                 /* If matching CSN was not found, invalidate the context. */
 747                 if ( !cb.sc_private ) {
 748                         /* If we didn't find an exact match, then try for <= */
 749                         if ( findcsn_retry ) {
 750                                 findcsn_retry = 0;
 751                                 rs_reinit( &frs, REP_RESULT );
 752                                 goto again;
 753                         }
 754                         rc = LDAP_NO_SUCH_OBJECT;
 755                 }
 756                 break;
 757         case FIND_PRESENT:
 758                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 759                 break;
 760         }
 761
 762         return rc;
 763 }
 764
 765 /* Should find a place to cache these */
 766 static mutexint *get_mutexint()
 767 {
 768         mutexint *mi = ch_malloc( sizeof( mutexint ));
 769         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 770         mi->mi_int = 1;
 771         return mi;
 772 }
 773
 774 static void inc_mutexint( mutexint *mi )
 775 {
 776         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 777         mi->mi_int++;
 778         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 779 }
 780
 781 /* return resulting counter */
 782 static int dec_mutexint( mutexint *mi )
 783 {
 784         int i;
 785         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 786         i = --mi->mi_int;
 787         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 788         if ( !i ) {
 789                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 790                 ch_free( mi );
 791         }
 792         return i;
 793 }
 794
 795 static void
 796 syncprov_free_syncop( syncops *so )
 797 {
 798         syncres *sr, *srnext;
 799         GroupAssertion *ga, *gnext;
 800
 801         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 802         /* already being freed, or still in use */
 803         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 804                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 805                 return;
 806         }
 807         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 808         if ( so->s_flags & PS_IS_DETACHED ) {
 809                 filter_free( so->s_op->ors_filter );
 810                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 811                         gnext = ga->ga_next;
 812                         ch_free( ga );
 813                 }
 814                 ch_free( so->s_op );
 815         }
 816         ch_free( so->s_base.bv_val );
 817         for ( sr=so->s_res; sr; sr=srnext ) {
 818                 srnext = sr->s_next;
 819                 if ( sr->s_e ) {
 820                         if ( !dec_mutexint( sr->s_e->e_private )) {
 821                                 sr->s_e->e_private = NULL;
 822                                 entry_free( sr->s_e );
 823                         }
 824                 }
 825                 ch_free( sr );
 826         }
 827         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 828         ch_free( so );
 829 }
 830
 831 /* Send a persistent search response */
 832 static int
 833 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 834 {
 835         SlapReply rs = { REP_SEARCH };
 836         struct berval cookie, csns[2];
 837         Entry e_uuid = {0};
 838         Attribute a_uuid = {0};
 839
 840         if ( so->s_op->o_abandon )
 841                 return SLAPD_ABANDON;
 842
 843         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 844         rs.sr_ctrls[1] = NULL;
 845         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 846         csns[0] = opc->sctxcsn;
 847         BER_BVZERO( &csns[1] );
 848         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 849
 850 #ifdef LDAP_DEBUG
 851         if ( so->s_sid > 0 ) {
 852                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 853                         so->s_sid, cookie.bv_val, 0 );
 854         } else {
 855                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 856                         cookie.bv_val, 0, 0 );
 857         }
 858 #endif
 859
 860         e_uuid.e_attrs = &a_uuid;
 861         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 862         a_uuid.a_nvals = &opc->suuid;
 863         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 864                 mode, rs.sr_ctrls, 0, 1, &cookie );
 865         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 866
 867         rs.sr_entry = &e_uuid;
 868         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 869                 e_uuid = *opc->se;
 870                 e_uuid.e_private = NULL;
 871         }
 872
 873         switch( mode ) {
 874         case LDAP_SYNC_ADD:
 875                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 876                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 877                         rs.sr_err = send_search_reference( op, &rs );
 878                         ber_bvarray_free( rs.sr_ref );
 879                         break;
 880                 }
 881                 /* fallthru */
 882         case LDAP_SYNC_MODIFY:
 883                 rs.sr_attrs = op->ors_attrs;
 884                 rs.sr_err = send_search_entry( op, &rs );
 885                 break;
 886         case LDAP_SYNC_DELETE:
 887                 e_uuid.e_attrs = NULL;
 888                 e_uuid.e_name = opc->sdn;
 889                 e_uuid.e_nname = opc->sndn;
 890                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 891                         struct berval bv = BER_BVNULL;
 892                         rs.sr_ref = &bv;
 893                         rs.sr_err = send_search_reference( op, &rs );
 894                 } else {
 895                         rs.sr_err = send_search_entry( op, &rs );
 896                 }
 897                 break;
 898         default:
 899                 assert(0);
 900         }
 901         return rs.sr_err;
 902 }
 903
 904 static void
 905 syncprov_qstart( syncops *so );
 906
 907 /* Play back queued responses */
 908 static int
 909 syncprov_qplay( Operation *op, syncops *so )
 910 {
 911         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 912         syncres *sr;
 913         opcookie opc;
 914         int rc = 0;
 915
 916         opc.son = on;
 917
 918         do {
 919                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 920                 sr = so->s_res;
 921                 /* Exit loop with mutex held */
 922                 if ( !sr )
 923                         break;
 924                 so->s_res = sr->s_next;
 925                 if ( !so->s_res )
 926                         so->s_restail = NULL;
 927                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 928
 929                 if ( !so->s_op->o_abandon ) {
 930
 931                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 932                                 SlapReply rs = { REP_INTERMEDIATE };
 933
 934                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 935                                         &sr->s_csn, 0, NULL, 0 );
 936                         } else {
 937                                 opc.sdn = sr->s_dn;
 938                                 opc.sndn = sr->s_ndn;
 939                                 opc.suuid = sr->s_uuid;
 940                                 opc.sctxcsn = sr->s_csn;
 941                                 opc.sreference = sr->s_isreference;
 942                                 opc.se = sr->s_e;
 943
 944                                 rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 945                         }
 946                 }
 947
 948                 if ( sr->s_e ) {
 949                         if ( !dec_mutexint( sr->s_e->e_private )) {
 950                                 sr->s_e->e_private = NULL;
 951                                 entry_free ( sr->s_e );
 952                         }
 953                 }
 954                 ch_free( sr );
 955
 956                 if ( so->s_op->o_abandon )
 957                         continue;
 958
 959                 /* Exit loop with mutex held */
 960                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 961                 break;
 962
 963         } while (1);
 964
 965         /* We now only send one change at a time, to prevent one
 966          * psearch from hogging all the CPU. Resubmit this task if
 967          * there are more responses queued and no errors occurred.
 968          */
 969
 970         if ( rc == 0 && so->s_res ) {
 971                 syncprov_qstart( so );
 972         } else {
 973                 so->s_flags ^= PS_TASK_QUEUED;
 974         }
 975
 976         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 977         return rc;
 978 }
 979
 980 /* task for playing back queued responses */
 981 static void *
 982 syncprov_qtask( void *ctx, void *arg )
 983 {
 984         syncops *so = arg;
 985         OperationBuffer opbuf;
 986         Operation *op;
 987         BackendDB be;
 988         int rc;
 989
 990         op = &opbuf.ob_op;
 991         *op = *so->s_op;
 992         op->o_hdr = &opbuf.ob_hdr;
 993         op->o_controls = opbuf.ob_controls;
 994         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 995         op->o_sync = SLAP_CONTROL_IGNORED;
 996
 997         *op->o_hdr = *so->s_op->o_hdr;
 998
 999         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
1000         op->o_tmpmfuncs = &slap_sl_mfuncs;
1001         op->o_threadctx = ctx;
1002
1003         /* syncprov_qplay expects a fake db */
1004         be = *so->s_op->o_bd;
1005         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1006         op->o_bd = &be;
1007         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1008         op->o_callback = NULL;
1009
1010         rc = syncprov_qplay( op, so );
1011
1012         /* decrement use count... */
1013         syncprov_free_syncop( so );
1014
1015         return NULL;
1016 }
1017
1018 /* Start the task to play back queued psearch responses */
1019 static void
1020 syncprov_qstart( syncops *so )
1021 {
1022         so->s_flags |= PS_TASK_QUEUED;
1023         so->s_inuse++;
1024         ldap_pvt_thread_pool_submit( &connection_pool,
1025                 syncprov_qtask, so );
1026 }
1027
1028 /* Queue a persistent search response */
1029 static int
1030 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1031 {
1032         syncres *sr;
1033         int srsize;
1034         struct berval cookie = opc->sctxcsn;
1035
1036         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1037                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1038
1039                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1040                         so->s_rid, slap_serverID ? slap_serverID : -1);
1041         }
1042
1043         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1044                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1045         if ( cookie.bv_len )
1046                 srsize += cookie.bv_len + 1;
1047         sr = ch_malloc( srsize );
1048         sr->s_next = NULL;
1049         sr->s_e = opc->se;
1050         /* bump refcount on this entry */
1051         if ( opc->se )
1052                 inc_mutexint( opc->se->e_private );
1053         sr->s_dn.bv_val = (char *)(sr + 1);
1054         sr->s_dn.bv_len = opc->sdn.bv_len;
1055         sr->s_mode = mode;
1056         sr->s_isreference = opc->sreference;
1057         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1058                  opc->sdn.bv_val ) + 1;
1059         sr->s_ndn.bv_len = opc->sndn.bv_len;
1060         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1061                  opc->sndn.bv_val ) + 1;
1062         sr->s_uuid.bv_len = opc->suuid.bv_len;
1063         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1064         if ( cookie.bv_len ) {
1065                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1066                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1067         } else {
1068                 sr->s_csn.bv_val = NULL;
1069         }
1070         sr->s_csn.bv_len = cookie.bv_len;
1071
1072         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1073                 ch_free( cookie.bv_val );
1074         }
1075
1076         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1077         if ( !so->s_res ) {
1078                 so->s_res = sr;
1079         } else {
1080                 so->s_restail->s_next = sr;
1081         }
1082         so->s_restail = sr;
1083
1084         /* If the base of the psearch was modified, check it next time round */
1085         if ( so->s_flags & PS_WROTE_BASE ) {
1086                 so->s_flags ^= PS_WROTE_BASE;
1087                 so->s_flags |= PS_FIND_BASE;
1088         }
1089         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1090                 syncprov_qstart( so );
1091         }
1092         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1093         return LDAP_SUCCESS;
1094 }
1095
1096 static int
1097 syncprov_drop_psearch( syncops *so, int lock )
1098 {
1099         if ( so->s_flags & PS_IS_DETACHED ) {
1100                 if ( lock )
1101                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1102                 so->s_op->o_conn->c_n_ops_executing--;
1103                 so->s_op->o_conn->c_n_ops_completed++;
1104                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1105                         o_next );
1106                 if ( lock )
1107                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1108         }
1109         syncprov_free_syncop( so );
1110
1111         return 0;
1112 }
1113
1114 static int
1115 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1116 {
1117         slap_callback *sc = op->o_callback;
1118         op->o_callback = sc->sc_next;
1119         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1120         op->o_tmpfree( sc, op->o_tmpmemctx );
1121         return 0;
1122 }
1123
1124 static int
1125 syncprov_op_abandon( Operation *op, SlapReply *rs )
1126 {
1127         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1128         syncprov_info_t         *si = on->on_bi.bi_private;
1129         syncops *so, *soprev;
1130
1131         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1132         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1133                 soprev=so, so=so->s_next ) {
1134                 if ( so->s_op->o_connid == op->o_connid &&
1135                         so->s_op->o_msgid == op->orn_msgid ) {
1136                                 so->s_op->o_abandon = 1;
1137                                 soprev->s_next = so->s_next;
1138                                 break;
1139                 }
1140         }
1141         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1142         if ( so ) {
1143                 /* Is this really a Cancel exop? */
1144                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1145                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1146                         rs->sr_err = LDAP_CANCELLED;
1147                         send_ldap_result( so->s_op, rs );
1148                         if ( so->s_flags & PS_IS_DETACHED ) {
1149                                 slap_callback *cb;
1150                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1151                                 cb->sc_cleanup = syncprov_ab_cleanup;
1152                                 cb->sc_next = op->o_callback;
1153                                 cb->sc_private = so;
1154                                 op->o_callback = cb;
1155                                 return SLAP_CB_CONTINUE;
1156                         }
1157                 }
1158                 syncprov_drop_psearch( so, 0 );
1159         }
1160         return SLAP_CB_CONTINUE;
1161 }
1162
1163 /* Find which persistent searches are affected by this operation */
1164 static void
1165 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1166 {
1167         slap_overinst *on = opc->son;
1168         syncprov_info_t         *si = on->on_bi.bi_private;
1169
1170         fbase_cookie fc;
1171         syncops *ss, *sprev, *snext;
1172         Entry *e = NULL;
1173         Attribute *a;
1174         int rc;
1175         struct berval newdn;
1176         int freefdn = 0;
1177         BackendDB *b0 = op->o_bd, db;
1178
1179         fc.fdn = &op->o_req_ndn;
1180         /* compute new DN */
1181         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1182                 struct berval pdn;
1183                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1184                 else dnParent( fc.fdn, &pdn );
1185                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1186                 fc.fdn = &newdn;
1187                 freefdn = 1;
1188         }
1189         if ( op->o_tag != LDAP_REQ_ADD ) {
1190                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1191                         db = *op->o_bd;
1192                         op->o_bd = &db;
1193                 }
1194                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1195                 /* If we're sending responses now, make a copy and unlock the DB */
1196                 if ( e && !saveit ) {
1197                         if ( !opc->se ) {
1198                                 opc->se = entry_dup( e );
1199                                 opc->se->e_private = get_mutexint();
1200                         }
1201                         overlay_entry_release_ov( op, e, 0, on );
1202                         e = opc->se;
1203                 }
1204                 if ( rc ) {
1205                         op->o_bd = b0;
1206                         return;
1207                 }
1208         } else {
1209                 e = op->ora_e;
1210                 if ( !saveit ) {
1211                         if ( !opc->se ) {
1212                                 opc->se = entry_dup( e );
1213                                 opc->se->e_private = get_mutexint();
1214                         }
1215                         e = opc->se;
1216                 }
1217         }
1218
1219         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1220                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1221                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1222                 opc->sreference = is_entry_referral( e );
1223                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1224                 if ( a )
1225                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1226         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1227                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1228                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1229                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1230                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1231         }
1232
1233         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1234         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1235                 sprev = ss, ss=snext)
1236         {
1237                 Operation op2;
1238                 Opheader oh;
1239                 syncmatches *sm;
1240                 int found = 0;
1241
1242                 snext = ss->s_next;
1243                 if ( ss->s_op->o_abandon )
1244                         continue;
1245
1246                 /* Don't send ops back to the originator */
1247                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1248                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1249                                 opc->osid, 0, 0 );
1250                         continue;
1251                 }
1252
1253                 /* Don't send ops back to the messenger */
1254                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1255                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1256                                 opc->rsid, 0, 0 );
1257                         continue;
1258                 }
1259
1260                 /* validate base */
1261                 fc.fss = ss;
1262                 fc.fbase = 0;
1263                 fc.fscope = 0;
1264
1265                 /* If the base of the search is missing, signal a refresh */
1266                 rc = syncprov_findbase( op, &fc );
1267                 if ( rc != LDAP_SUCCESS ) {
1268                         SlapReply rs = {REP_RESULT};
1269                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1270                                 "search base has changed" );
1271                         sprev->s_next = snext;
1272                         syncprov_drop_psearch( ss, 1 );
1273                         ss = sprev;
1274                         continue;
1275                 }
1276
1277                 /* If we're sending results now, look for this op in old matches */
1278                 if ( !saveit ) {
1279                         syncmatches *old;
1280
1281                         /* Did we modify the search base? */
1282                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1283                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1284                                 ss->s_flags |= PS_WROTE_BASE;
1285                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1286                         }
1287
1288                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1289                                 old=sm, sm=sm->sm_next ) {
1290                                 if ( sm->sm_op == ss ) {
1291                                         found = 1;
1292                                         old->sm_next = sm->sm_next;
1293                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1294                                         break;
1295                                 }
1296                         }
1297                 }
1298
1299                 if ( fc.fscope ) {
1300                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1301                         op2 = *ss->s_op;
1302                         oh = *op->o_hdr;
1303                         oh.oh_conn = ss->s_op->o_conn;
1304                         oh.oh_connid = ss->s_op->o_connid;
1305                         op2.o_bd = op->o_bd->bd_self;
1306                         op2.o_hdr = &oh;
1307                         op2.o_extra = op->o_extra;
1308                         op2.o_callback = NULL;
1309                         if (ss->s_flags & PS_FIX_FILTER) {
1310                                 /* Skip the AND/GE clause that we stuck on in front. We
1311                                    would lose deletes/mods that happen during the refresh
1312                                    phase otherwise (ITS#6555) */
1313                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1314                         }
1315                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1316                         rc = test_filter( &op2, e, op2.ors_filter );
1317                 }
1318
1319                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1320                         ss->s_sid, fc.fscope, rc );
1321
1322                 /* check if current o_req_dn is in scope and matches filter */
1323                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1324                         if ( saveit ) {
1325                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1326                                 sm->sm_next = opc->smatches;
1327                                 sm->sm_op = ss;
1328                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1329                                 ++ss->s_inuse;
1330                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1331                                 opc->smatches = sm;
1332                         } else {
1333                                 /* if found send UPDATE else send ADD */
1334                                 syncprov_qresp( opc, ss,
1335                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1336                         }
1337                 } else if ( !saveit && found ) {
1338                         /* send DELETE */
1339                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1340                 } else if ( !saveit ) {
1341                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1342                 }
1343                 if ( !saveit && found ) {
1344                         /* Decrement s_inuse, was incremented when called
1345                          * with saveit == TRUE
1346                          */
1347                         syncprov_free_syncop( ss );
1348                 }
1349         }
1350         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1351
1352         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1353                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1354                         op->o_bd = &db;
1355                 }
1356                 if ( saveit )
1357                         overlay_entry_release_ov( op, e, 0, on );
1358                 op->o_bd = b0;
1359         }
1360         if ( opc->se && !saveit ) {
1361                 if ( !dec_mutexint( opc->se->e_private )) {
1362                         opc->se->e_private = NULL;
1363                         entry_free( opc->se );
1364                         opc->se = NULL;
1365                 }
1366         }
1367         if ( freefdn ) {
1368                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1369         }
1370         op->o_bd = b0;
1371 }
1372
1373 static int
1374 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1375 {
1376         slap_callback *cb = op->o_callback;
1377         opcookie *opc = cb->sc_private;
1378         slap_overinst *on = opc->son;
1379         syncprov_info_t         *si = on->on_bi.bi_private;
1380         syncmatches *sm, *snext;
1381         modtarget *mt;
1382
1383         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1384         if ( si->si_active )
1385                 si->si_active--;
1386         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1387
1388         for (sm = opc->smatches; sm; sm=snext) {
1389                 snext = sm->sm_next;
1390                 syncprov_free_syncop( sm->sm_op );
1391                 op->o_tmpfree( sm, op->o_tmpmemctx );
1392         }
1393
1394         /* Remove op from lock table */
1395         mt = opc->smt;
1396         if ( mt ) {
1397                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1398                 mt->mt_mods = mt->mt_mods->mi_next;
1399                 /* If there are more, promote the next one */
1400                 if ( mt->mt_mods ) {
1401                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1402                 } else {
1403                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1404                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1405                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1406                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1407                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1408                         ch_free( mt->mt_dn.bv_val );
1409                         ch_free( mt );
1410                 }
1411         }
1412         if ( !BER_BVISNULL( &opc->suuid ))
1413                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1414         if ( !BER_BVISNULL( &opc->sndn ))
1415                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1416         if ( !BER_BVISNULL( &opc->sdn ))
1417                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1418         op->o_callback = cb->sc_next;
1419         op->o_tmpfree(cb, op->o_tmpmemctx);
1420
1421         return 0;
1422 }
1423
1424 static void
1425 syncprov_checkpoint( Operation *op, slap_overinst *on )
1426 {
1427         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1428         Modifications mod;
1429         Operation opm;
1430         SlapReply rsm = {REP_RESULT};
1431         slap_callback cb = {0};
1432         BackendDB be;
1433         BackendInfo *bi;
1434
1435 #ifdef CHECK_CSN
1436         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1437
1438         int i;
1439         for ( i=0; i<si->si_numcsns; i++ ) {
1440                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1441         }
1442 #endif
1443         mod.sml_numvals = si->si_numcsns;
1444         mod.sml_values = si->si_ctxcsn;
1445         mod.sml_nvalues = NULL;
1446         mod.sml_desc = slap_schema.si_ad_contextCSN;
1447         mod.sml_op = LDAP_MOD_REPLACE;
1448         mod.sml_flags = SLAP_MOD_INTERNAL;
1449         mod.sml_next = NULL;
1450
1451         cb.sc_response = slap_null_cb;
1452         opm = *op;
1453         opm.o_tag = LDAP_REQ_MODIFY;
1454         opm.o_callback = &cb;
1455         opm.orm_modlist = &mod;
1456         opm.orm_no_opattrs = 1;
1457         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1458                 be = *on->on_info->oi_origdb;
1459                 opm.o_bd = &be;
1460         }
1461         opm.o_req_dn = si->si_contextdn;
1462         opm.o_req_ndn = si->si_contextdn;
1463         bi = opm.o_bd->bd_info;
1464         opm.o_bd->bd_info = on->on_info->oi_orig;
1465         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1466         opm.o_no_schema_check = 1;
1467         opm.o_bd->be_modify( &opm, &rsm );
1468
1469         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1470                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1471                 const char      *text;
1472                 char txtbuf[SLAP_TEXT_BUFLEN];
1473                 size_t textlen = sizeof txtbuf;
1474                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1475                 rs_reinit( &rsm, REP_RESULT );
1476                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1477                 opm.ora_e = e;
1478                 opm.o_bd->be_add( &opm, &rsm );
1479                 if ( e == opm.ora_e )
1480                         be_entry_release_w( &opm, opm.ora_e );
1481         }
1482         opm.o_bd->bd_info = bi;
1483
1484         if ( mod.sml_next != NULL ) {
1485                 slap_mods_free( mod.sml_next, 1 );
1486         }
1487 #ifdef CHECK_CSN
1488         for ( i=0; i<si->si_numcsns; i++ ) {
1489                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1490         }
1491 #endif
1492 }
1493
1494 static void
1495 syncprov_add_slog( Operation *op )
1496 {
1497         opcookie *opc = op->o_callback->sc_private;
1498         slap_overinst *on = opc->son;
1499         syncprov_info_t         *si = on->on_bi.bi_private;
1500         sessionlog *sl;
1501         slog_entry *se;
1502
1503         sl = si->si_logs;
1504         {
1505                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1506                         /* During the syncrepl refresh phase we can receive operations
1507                          * without a csn.  We cannot reliably determine the consumers
1508                          * state with respect to such operations, so we ignore them and
1509                          * wipe out anything in the log if we see them.
1510                          */
1511                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1512                         while ( se = sl->sl_head ) {
1513                                 sl->sl_head = se->se_next;
1514                                 ch_free( se );
1515                         }
1516                         sl->sl_tail = NULL;
1517                         sl->sl_num = 0;
1518                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1519                         return;
1520                 }
1521
1522                 /* Allocate a record. UUIDs are not NUL-terminated. */
1523                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1524                         op->o_csn.bv_len + 1 );
1525                 se->se_next = NULL;
1526                 se->se_tag = op->o_tag;
1527
1528                 se->se_uuid.bv_val = (char *)(&se[1]);
1529                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1530                 se->se_uuid.bv_len = opc->suuid.bv_len;
1531
1532                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1533                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1534                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1535                 se->se_csn.bv_len = op->o_csn.bv_len;
1536                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1537
1538                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1539                 if ( sl->sl_head ) {
1540                         /* Keep the list in csn order. */
1541                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1542                                 sl->sl_tail->se_next = se;
1543                                 sl->sl_tail = se;
1544                         } else {
1545                                 slog_entry **sep;
1546
1547                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1548                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1549                                                 se->se_next = *sep;
1550                                                 *sep = se;
1551                                                 break;
1552                                         }
1553                                 }
1554                         }
1555                 } else {
1556                         sl->sl_head = se;
1557                         sl->sl_tail = se;
1558                         if ( !sl->sl_mincsn ) {
1559                                 sl->sl_numcsns = 1;
1560                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1561                                 sl->sl_sids = ch_malloc( sizeof( int ));
1562                                 sl->sl_sids[0] = se->se_sid;
1563                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1564                                 BER_BVZERO( &sl->sl_mincsn[1] );
1565                         }
1566                 }
1567                 sl->sl_num++;
1568                 while ( sl->sl_num > sl->sl_size ) {
1569                         int i, j;
1570                         se = sl->sl_head;
1571                         sl->sl_head = se->se_next;
1572                         for ( i=0; i<sl->sl_numcsns; i++ )
1573                                 if ( sl->sl_sids[i] >= se->se_sid )
1574                                         break;
1575                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1576                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1577                                         i, se->se_sid, &se->se_csn );
1578                         } else {
1579                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1580                         }
1581                         ch_free( se );
1582                         sl->sl_num--;
1583                 }
1584                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1585         }
1586 }
1587
1588 /* Just set a flag if we found the matching entry */
1589 static int
1590 playlog_cb( Operation *op, SlapReply *rs )
1591 {
1592         if ( rs->sr_type == REP_SEARCH ) {
1593                 op->o_callback->sc_private = (void *)1;
1594         }
1595         return rs->sr_err;
1596 }
1597
1598 /* enter with sl->sl_mutex locked, release before returning */
1599 static void
1600 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1601         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1602 {
1603         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1604         slog_entry *se;
1605         int i, j, ndel, num, nmods, mmods;
1606         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1607         BerVarray uuids;
1608         struct berval delcsn[2];
1609
1610         if ( !sl->sl_num ) {
1611                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1612                 return;
1613         }
1614
1615         num = sl->sl_num;
1616         i = 0;
1617         nmods = 0;
1618
1619         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1620                 num * UUID_LEN, op->o_tmpmemctx );
1621         uuids[0].bv_val = (char *)(uuids + num + 1);
1622
1623         delcsn[0].bv_len = 0;
1624         delcsn[0].bv_val = cbuf;
1625         BER_BVZERO(&delcsn[1]);
1626
1627         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1628          * and everything else at the end. Do this first so we can
1629          * unlock the list mutex.
1630          */
1631         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1632                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1633         for ( se=sl->sl_head; se; se=se->se_next ) {
1634                 int k;
1635                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1636                 ndel = 1;
1637                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1638                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1639                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1640                                 break;
1641                         }
1642                 }
1643                 if ( ndel <= 0 ) {
1644                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1645                         continue;
1646                 }
1647                 ndel = 0;
1648                 for ( k=0; k<numcsns; k++ ) {
1649                         if ( se->se_sid == sids[k] ) {
1650                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1651                                 break;
1652                         }
1653                 }
1654                 if ( ndel > 0 ) {
1655                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1656                         break;
1657                 }
1658                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1659                         j = i;
1660                         i++;
1661                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1662                         delcsn[0].bv_len = se->se_csn.bv_len;
1663                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1664                 } else {
1665                         if ( se->se_tag == LDAP_REQ_ADD )
1666                                 continue;
1667                         nmods++;
1668                         j = num - nmods;
1669                 }
1670                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1671                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1672                 uuids[j].bv_len = UUID_LEN;
1673         }
1674         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1675
1676         ndel = i;
1677
1678         /* Zero out unused slots */
1679         for ( i=ndel; i < num - nmods; i++ )
1680                 uuids[i].bv_len = 0;
1681
1682         /* Mods must be validated to see if they belong in this delete set.
1683          */
1684
1685         mmods = nmods;
1686         /* Strip any duplicates */
1687         for ( i=0; i<nmods; i++ ) {
1688                 for ( j=0; j<ndel; j++ ) {
1689                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1690                                 uuids[num - 1 - i].bv_len = 0;
1691                                 mmods --;
1692                                 break;
1693                         }
1694                 }
1695                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1696                 for ( j=0; j<i; j++ ) {
1697                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1698                                 uuids[num - 1 - i].bv_len = 0;
1699                                 mmods --;
1700                                 break;
1701                         }
1702                 }
1703         }
1704
1705         if ( mmods ) {
1706                 Operation fop;
1707                 int rc;
1708                 Filter mf, af;
1709                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1710                 slap_callback cb = {0};
1711
1712                 fop = *op;
1713
1714                 fop.o_sync_mode = 0;
1715                 fop.o_callback = &cb;
1716                 fop.ors_limit = NULL;
1717                 fop.ors_tlimit = SLAP_NO_LIMIT;
1718                 fop.ors_attrs = slap_anlist_all_attributes;
1719                 fop.ors_attrsonly = 0;
1720                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1721
1722                 af.f_choice = LDAP_FILTER_AND;
1723                 af.f_next = NULL;
1724                 af.f_and = &mf;
1725                 mf.f_choice = LDAP_FILTER_EQUALITY;
1726                 mf.f_ava = &eq;
1727                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1728                 mf.f_next = fop.ors_filter;
1729
1730                 fop.ors_filter = &af;
1731
1732                 cb.sc_response = playlog_cb;
1733                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1734
1735                 for ( i=ndel; i<num; i++ ) {
1736                   if ( uuids[i].bv_len != 0 ) {
1737                         SlapReply frs = { REP_RESULT };
1738
1739                         mf.f_av_value = uuids[i];
1740                         cb.sc_private = NULL;
1741                         fop.ors_slimit = 1;
1742                         rc = fop.o_bd->be_search( &fop, &frs );
1743
1744                         /* If entry was not found, add to delete list */
1745                         if ( !cb.sc_private ) {
1746                                 uuids[ndel++] = uuids[i];
1747                         }
1748                   }
1749                 }
1750                 fop.o_bd->bd_info = (BackendInfo *)on;
1751         }
1752         if ( ndel ) {
1753                 struct berval cookie;
1754
1755                 if ( delcsn[0].bv_len ) {
1756                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1757                                 slap_serverID ? slap_serverID : -1 );
1758
1759                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1760                 }
1761
1762                 uuids[ndel].bv_val = NULL;
1763                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1764                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1765                 if ( delcsn[0].bv_len ) {
1766                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1767                 }
1768         }
1769         op->o_tmpfree( uuids, op->o_tmpmemctx );
1770 }
1771
1772 static int
1773 syncprov_op_response( Operation *op, SlapReply *rs )
1774 {
1775         opcookie *opc = op->o_callback->sc_private;
1776         slap_overinst *on = opc->son;
1777         syncprov_info_t         *si = on->on_bi.bi_private;
1778         syncmatches *sm;
1779
1780         if ( rs->sr_err == LDAP_SUCCESS )
1781         {
1782                 struct berval maxcsn;
1783                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1784                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1785
1786                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1787
1788                 /* Update our context CSN */
1789                 cbuf[0] = '\0';
1790                 maxcsn.bv_val = cbuf;
1791                 maxcsn.bv_len = sizeof(cbuf);
1792                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1793
1794                 slap_get_commit_csn( op, &maxcsn, &foundit );
1795                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1796                         /* syncrepl queues the CSN values in the db where
1797                          * it is configured , not where the changes are made.
1798                          * So look for a value in the glue db if we didn't
1799                          * find any in this db.
1800                          */
1801                         BackendDB *be = op->o_bd;
1802                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1803                         maxcsn.bv_val = cbuf;
1804                         maxcsn.bv_len = sizeof(cbuf);
1805                         slap_get_commit_csn( op, &maxcsn, &foundit );
1806                         op->o_bd = be;
1807                 }
1808                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1809                         int i, sid;
1810 #ifdef CHECK_CSN
1811                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1812                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1813 #endif
1814                         sid = slap_parse_csn_sid( &maxcsn );
1815                         for ( i=0; i<si->si_numcsns; i++ ) {
1816                                 if ( sid < si->si_sids[i] )
1817                                         break;
1818                                 if ( sid == si->si_sids[i] ) {
1819                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1820                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1821                                                 csn_changed = 1;
1822                                         }
1823                                         break;
1824                                 }
1825                         }
1826                         /* It's a new SID for us */
1827                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1828                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1829                                         i, sid, &maxcsn );
1830                                 csn_changed = 1;
1831                         }
1832                 }
1833
1834                 /* Don't do any processing for consumer contextCSN updates */
1835                 if ( op->o_dont_replicate ) {
1836                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1837                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1838                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1839                         /* Catch contextCSN updates from syncrepl. We have to look at
1840                          * all the attribute values, as there may be more than one csn
1841                          * that changed, and only one can be passed in the csn queue.
1842                          */
1843                         Modifications *mod = op->orm_modlist;
1844                         unsigned i;
1845                         int j, sid;
1846
1847                         for ( i=0; i<mod->sml_numvals; i++ ) {
1848                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1849                                 for ( j=0; j<si->si_numcsns; j++ ) {
1850                                         if ( sid < si->si_sids[j] )
1851                                                 break;
1852                                         if ( sid == si->si_sids[j] ) {
1853                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1854                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1855                                                         csn_changed = 1;
1856                                                 }
1857                                                 break;
1858                                         }
1859                                 }
1860
1861                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1862                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1863                                                 j, sid, &mod->sml_values[i] );
1864                                         csn_changed = 1;
1865                                 }
1866                         }
1867                         if ( csn_changed )
1868                                 si->si_dirty = 0;
1869                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1870
1871                         if ( csn_changed ) {
1872                                 syncops *ss;
1873                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1874                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1875                                         if ( ss->s_op->o_abandon )
1876                                                 continue;
1877                                         /* Send the updated csn to all syncrepl consumers,
1878                                          * including the server from which it originated.
1879                                          * The syncrepl consumer and syncprov provider on
1880                                          * the originating server may be configured to store
1881                                          * their csn values in different entries.
1882                                          */
1883                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1884                                 }
1885                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1886                         }
1887                         } else {
1888                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1889                         }
1890                         goto leave;
1891                 }
1892
1893                 si->si_numops++;
1894                 if ( si->si_chkops || si->si_chktime ) {
1895                         /* Never checkpoint adding the context entry,
1896                          * it will deadlock
1897                          */
1898                         if ( op->o_tag != LDAP_REQ_ADD ||
1899                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1900                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1901                                         do_check = 1;
1902                                         si->si_numops = 0;
1903                                 }
1904                                 if ( si->si_chktime &&
1905                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1906                                         if ( si->si_chklast ) {
1907                                                 do_check = 1;
1908                                                 si->si_chklast = op->o_time;
1909                                         } else {
1910                                                 si->si_chklast = 1;
1911                                         }
1912                                 }
1913                         }
1914                 }
1915                 si->si_dirty = !csn_changed;
1916                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1917
1918                 if ( do_check ) {
1919                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1920                         syncprov_checkpoint( op, on );
1921                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1922                 }
1923
1924                 /* only update consumer ctx if this is a newer csn */
1925                 if ( csn_changed ) {
1926                         opc->sctxcsn = maxcsn;
1927                 }
1928
1929                 /* Handle any persistent searches */
1930                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1931                 have_psearches = ( si->si_ops != NULL );
1932                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1933                 if ( have_psearches ) {
1934                         switch(op->o_tag) {
1935                         case LDAP_REQ_ADD:
1936                         case LDAP_REQ_MODIFY:
1937                         case LDAP_REQ_MODRDN:
1938                         case LDAP_REQ_EXTENDED:
1939                                 syncprov_matchops( op, opc, 0 );
1940                                 break;
1941                         case LDAP_REQ_DELETE:
1942                                 /* for each match in opc->smatches:
1943                                  *   send DELETE msg
1944                                  */
1945                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1946                                         if ( sm->sm_op->s_op->o_abandon )
1947                                                 continue;
1948                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1949                                 }
1950                                 break;
1951                         }
1952                 }
1953
1954                 /* Add any log records */
1955                 if ( si->si_logs ) {
1956                         syncprov_add_slog( op );
1957                 }
1958 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1959         }
1960         return SLAP_CB_CONTINUE;
1961 }
1962
1963 /* We don't use a subentry to store the context CSN any more.
1964  * We expose the current context CSN as an operational attribute
1965  * of the suffix entry.
1966  */
1967 static int
1968 syncprov_op_compare( Operation *op, SlapReply *rs )
1969 {
1970         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1971         syncprov_info_t         *si = on->on_bi.bi_private;
1972         int rc = SLAP_CB_CONTINUE;
1973
1974         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1975                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1976         {
1977                 Entry e = {0};
1978                 Attribute a = {0};
1979
1980                 e.e_name = si->si_contextdn;
1981                 e.e_nname = si->si_contextdn;
1982                 e.e_attrs = &a;
1983
1984                 a.a_desc = slap_schema.si_ad_contextCSN;
1985
1986                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1987
1988                 a.a_vals = si->si_ctxcsn;
1989                 a.a_nvals = a.a_vals;
1990                 a.a_numvals = si->si_numcsns;
1991
1992                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1993                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1994                 if ( ! rs->sr_err ) {
1995                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1996                         goto return_results;
1997                 }
1998
1999                 if ( get_assert( op ) &&
2000                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2001                 {
2002                         rs->sr_err = LDAP_ASSERTION_FAILED;
2003                         goto return_results;
2004                 }
2005
2006
2007                 rs->sr_err = LDAP_COMPARE_FALSE;
2008
2009                 if ( attr_valfind( &a,
2010                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2011                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2012                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2013                 {
2014                         rs->sr_err = LDAP_COMPARE_TRUE;
2015                 }
2016
2017 return_results:;
2018
2019                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2020
2021                 send_ldap_result( op, rs );
2022
2023                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2024                         rs->sr_err = LDAP_SUCCESS;
2025                 }
2026                 rc = rs->sr_err;
2027         }
2028
2029         return rc;
2030 }
2031
2032 static int
2033 syncprov_op_mod( Operation *op, SlapReply *rs )
2034 {
2035         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2036         syncprov_info_t         *si = on->on_bi.bi_private;
2037         slap_callback *cb;
2038         opcookie *opc;
2039         int have_psearches, cbsize;
2040
2041         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2042         have_psearches = ( si->si_ops != NULL );
2043         si->si_active++;
2044         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2045
2046         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2047                 (have_psearches ? sizeof(modinst) : 0 );
2048
2049         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2050         opc = (opcookie *)(cb+1);
2051         opc->son = on;
2052         cb->sc_response = syncprov_op_response;
2053         cb->sc_cleanup = syncprov_op_cleanup;
2054         cb->sc_private = opc;
2055         cb->sc_next = op->o_callback;
2056         op->o_callback = cb;
2057
2058         opc->osid = -1;
2059         opc->rsid = -1;
2060         if ( op->o_csn.bv_val ) {
2061                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2062         }
2063         if ( op->o_controls ) {
2064                 struct sync_cookie *scook =
2065                 op->o_controls[slap_cids.sc_LDAPsync];
2066                 if ( scook )
2067                         opc->rsid = scook->sid;
2068         }
2069
2070         if ( op->o_dont_replicate )
2071                 return SLAP_CB_CONTINUE;
2072
2073         /* If there are active persistent searches, lock this operation.
2074          * See seqmod.c for the locking logic on its own.
2075          */
2076         if ( have_psearches ) {
2077                 modtarget *mt, mtdummy;
2078                 modinst *mi;
2079
2080                 mi = (modinst *)(opc+1);
2081                 mi->mi_op = op;
2082
2083                 /* See if we're already modifying this entry... */
2084                 mtdummy.mt_dn = op->o_req_ndn;
2085                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2086                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2087                 if ( mt ) {
2088                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2089                         if ( mt->mt_mods == NULL ) {
2090                                 /* Cannot reuse this mt, as another thread is about
2091                                  * to release it in syncprov_op_cleanup.
2092                                  */
2093                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2094                                 mt = NULL;
2095                         }
2096                 }
2097                 if ( mt ) {
2098                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2099                         mt->mt_tail->mi_next = mi;
2100                         mt->mt_tail = mi;
2101                         /* wait for this op to get to head of list */
2102                         while ( mt->mt_mods != mi ) {
2103                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2104                                 /* FIXME: if dynamic config can delete overlays or
2105                                  * databases we'll have to check for cleanup here.
2106                                  * Currently it's not an issue because there are
2107                                  * no dynamic config deletes...
2108                                  */
2109                                 if ( slapd_shutdown )
2110                                         return SLAPD_ABANDON;
2111
2112                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2113                                         ldap_pvt_thread_yield();
2114                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2115
2116                                 /* clean up if the caller is giving up */
2117                                 if ( op->o_abandon ) {
2118                                         modinst *m2;
2119                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2120                                                 m2 = m2->mi_next );
2121                                         if ( m2 ) {
2122                                                 m2->mi_next = mi->mi_next;
2123                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2124                                         }
2125                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2126                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2127                                         return SLAPD_ABANDON;
2128                                 }
2129                         }
2130                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2131                 } else {
2132                         /* Record that we're modifying this entry now */
2133                         mt = ch_malloc( sizeof(modtarget) );
2134                         mt->mt_mods = mi;
2135                         mt->mt_tail = mi;
2136                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2137                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2138                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2139                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2140                 }
2141                 opc->smt = mt;
2142         }
2143
2144         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2145                 syncprov_matchops( op, opc, 1 );
2146
2147         return SLAP_CB_CONTINUE;
2148 }
2149
2150 static int
2151 syncprov_op_extended( Operation *op, SlapReply *rs )
2152 {
2153         if ( exop_is_write( op ))
2154                 return syncprov_op_mod( op, rs );
2155
2156         return SLAP_CB_CONTINUE;
2157 }
2158
2159 typedef struct searchstate {
2160         slap_overinst *ss_on;
2161         syncops *ss_so;
2162         BerVarray ss_ctxcsn;
2163         int *ss_sids;
2164         int ss_numcsns;
2165 #define SS_PRESENT      0x01
2166 #define SS_CHANGED      0x02
2167         int ss_flags;
2168 } searchstate;
2169
2170 typedef struct SyncOperationBuffer {
2171         Operation               sob_op;
2172         Opheader                sob_hdr;
2173         OpExtra                 sob_oe;
2174         AttributeName   sob_extra;      /* not always present */
2175         /* Further data allocated here */
2176 } SyncOperationBuffer;
2177
2178 static void
2179 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2180 {
2181         SyncOperationBuffer *sopbuf2;
2182         Operation *op2;
2183         int i, alen = 0;
2184         size_t size;
2185         char *ptr;
2186         GroupAssertion *g1, *g2;
2187
2188         /* count the search attrs */
2189         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2190                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2191         }
2192         /* Make a new copy of the operation */
2193         size = offsetof( SyncOperationBuffer, sob_extra ) +
2194                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2195                 op->o_req_dn.bv_len + 1 +
2196                 op->o_req_ndn.bv_len + 1 +
2197                 op->o_ndn.bv_len + 1 +
2198                 so->s_filterstr.bv_len + 1;
2199         sopbuf2 = ch_calloc( 1, size );
2200         op2 = &sopbuf2->sob_op;
2201         op2->o_hdr = &sopbuf2->sob_hdr;
2202         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2203
2204         /* Copy the fields we care about explicitly, leave the rest alone */
2205         *op2->o_hdr = *op->o_hdr;
2206         op2->o_tag = op->o_tag;
2207         op2->o_time = op->o_time;
2208         op2->o_bd = on->on_info->oi_origdb;
2209         op2->o_request = op->o_request;
2210         op2->o_managedsait = op->o_managedsait;
2211         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2212         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2213
2214         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2215         if ( i ) {
2216                 op2->ors_attrs = (AttributeName *) ptr;
2217                 ptr = (char *) &op2->ors_attrs[i+1];
2218                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2219                         op2->ors_attrs[i] = op->ors_attrs[i];
2220                         op2->ors_attrs[i].an_name.bv_val = ptr;
2221                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2222                 }
2223                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2224         }
2225
2226         op2->o_authz = op->o_authz;
2227         op2->o_ndn.bv_val = ptr;
2228         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2229         op2->o_dn = op2->o_ndn;
2230         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2231         op2->o_req_dn.bv_val = ptr;
2232         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2233         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2234         op2->o_req_ndn.bv_val = ptr;
2235         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2236         op2->ors_filterstr.bv_val = ptr;
2237         strcpy( ptr, so->s_filterstr.bv_val );
2238         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2239
2240         /* Skip the AND/GE clause that we stuck on in front */
2241         if ( so->s_flags & PS_FIX_FILTER ) {
2242                 op2->ors_filter = op->ors_filter->f_and->f_next;
2243                 so->s_flags ^= PS_FIX_FILTER;
2244         } else {
2245                 op2->ors_filter = op->ors_filter;
2246         }
2247         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2248         so->s_op = op2;
2249
2250         /* Copy any cached group ACLs individually */
2251         op2->o_groups = NULL;
2252         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2253                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2254                 *g2 = *g1;
2255                 strcpy( g2->ga_ndn, g1->ga_ndn );
2256                 g2->ga_next = op2->o_groups;
2257                 op2->o_groups = g2;
2258         }
2259         /* Don't allow any further group caching */
2260         op2->o_do_not_cache = 1;
2261
2262         /* Add op2 to conn so abandon will find us */
2263         op->o_conn->c_n_ops_executing++;
2264         op->o_conn->c_n_ops_completed--;
2265         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2266         so->s_flags |= PS_IS_DETACHED;
2267
2268         /* Prevent anyone else from trying to send a result for this op */
2269         op->o_abandon = 1;
2270 }
2271
2272 static int
2273 syncprov_search_response( Operation *op, SlapReply *rs )
2274 {
2275         searchstate *ss = op->o_callback->sc_private;
2276         slap_overinst *on = ss->ss_on;
2277         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2278         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2279
2280         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2281                 Attribute *a;
2282                 /* If we got a referral without a referral object, there's
2283                  * something missing that we cannot replicate. Just ignore it.
2284                  * The consumer will abort because we didn't send the expected
2285                  * control.
2286                  */
2287                 if ( !rs->sr_entry ) {
2288                         assert( rs->sr_entry != NULL );
2289                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2290                         return SLAP_CB_CONTINUE;
2291                 }
2292                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2293                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2294                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2295                 }
2296                 if ( a ) {
2297                         int i, sid;
2298                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2299
2300                         /* Don't send changed entries back to the originator */
2301                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2302                                 Debug( LDAP_DEBUG_SYNC,
2303                                         "Entry %s changed by peer, ignored\n",
2304                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2305                                 return LDAP_SUCCESS;
2306                         }
2307
2308                         /* If not a persistent search */
2309                         if ( !ss->ss_so ) {
2310                                 /* Make sure entry is less than the snapshot'd contextCSN */
2311                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2312                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2313                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2314                                                 Debug( LDAP_DEBUG_SYNC,
2315                                                         "Entry %s CSN %s greater than snapshot %s\n",
2316                                                         rs->sr_entry->e_name.bv_val,
2317                                                         a->a_nvals[0].bv_val,
2318                                                         ss->ss_ctxcsn[i].bv_val );
2319                                                 return LDAP_SUCCESS;
2320                                         }
2321                                 }
2322                         }
2323
2324                         /* Don't send old entries twice */
2325                         if ( srs->sr_state.ctxcsn ) {
2326                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2327                                         if ( sid == srs->sr_state.sids[i] &&
2328                                                 ber_bvcmp( &a->a_nvals[0],
2329                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2330                                                 Debug( LDAP_DEBUG_SYNC,
2331                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2332                                                         rs->sr_entry->e_name.bv_val,
2333                                                         a->a_nvals[0].bv_val,
2334                                                         srs->sr_state.ctxcsn[i].bv_val );
2335                                                 return LDAP_SUCCESS;
2336                                         }
2337                                 }
2338                         }
2339                 }
2340                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2341                         op->o_tmpmemctx );
2342                 rs->sr_ctrls[1] = NULL;
2343                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2344                 /* If we're in delta-sync mode, always send a cookie */
2345                 if ( si->si_nopres && si->si_usehint && a ) {
2346                         struct berval cookie;
2347                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2348                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2349                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2350                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2351                 } else {
2352                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2353                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2354                 }
2355         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2356                 struct berval cookie = BER_BVNULL;
2357
2358                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2359                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2360                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2361                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2362
2363                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2364                 }
2365
2366                 /* Is this a regular refresh?
2367                  * Note: refresh never gets here if there were no changes
2368                  */
2369                 if ( !ss->ss_so ) {
2370                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2371                                 op->o_tmpmemctx );
2372                         rs->sr_ctrls[1] = NULL;
2373                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2374                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2375                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2376                                         LDAP_SYNC_REFRESH_DELETES );
2377                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2378                 } else {
2379                 /* It's RefreshAndPersist, transition to Persist phase */
2380                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2381                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2382                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2383                                 1, NULL, 0 );
2384                         if ( !BER_BVISNULL( &cookie ))
2385                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2386
2387                         /* Detach this Op from frontend control */
2388                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2389
2390                         /* But not if this connection was closed along the way */
2391                         if ( op->o_abandon ) {
2392                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2393                                 /* syncprov_ab_cleanup will free this syncop */
2394                                 return SLAPD_ABANDON;
2395
2396                         } else {
2397                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2398                                 /* Turn off the refreshing flag */
2399                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2400
2401                                 syncprov_detach_op( op, ss->ss_so, on );
2402
2403                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2404
2405                                 /* If there are queued responses, fire them off */
2406                                 if ( ss->ss_so->s_res )
2407                                         syncprov_qstart( ss->ss_so );
2408                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2409                         }
2410
2411                         return LDAP_SUCCESS;
2412                 }
2413         }
2414
2415         return SLAP_CB_CONTINUE;
2416 }
2417
2418 static int
2419 syncprov_op_search( Operation *op, SlapReply *rs )
2420 {
2421         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2422         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2423         slap_callback   *cb;
2424         int gotstate = 0, changed = 0, do_present = 0;
2425         syncops *sop = NULL;
2426         searchstate *ss;
2427         sync_control *srs;
2428         BerVarray ctxcsn;
2429         int i, *sids, numcsns;
2430         struct berval mincsn, maxcsn;
2431         int minsid, maxsid;
2432         int dirty = 0;
2433
2434         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2435
2436         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2437                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2438                 return rs->sr_err;
2439         }
2440
2441         srs = op->o_controls[slap_cids.sc_LDAPsync];
2442
2443         /* If this is a persistent search, set it up right away */
2444         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2445                 syncops so = {0};
2446                 fbase_cookie fc;
2447                 opcookie opc;
2448                 slap_callback sc;
2449
2450                 fc.fss = &so;
2451                 fc.fbase = 0;
2452                 so.s_eid = NOID;
2453                 so.s_op = op;
2454                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2455                 /* syncprov_findbase expects to be called as a callback... */
2456                 sc.sc_private = &opc;
2457                 opc.son = on;
2458                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2459                 cb = op->o_callback;
2460                 op->o_callback = &sc;
2461                 rs->sr_err = syncprov_findbase( op, &fc );
2462                 op->o_callback = cb;
2463                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2464
2465                 if ( rs->sr_err != LDAP_SUCCESS ) {
2466                         send_ldap_result( op, rs );
2467                         return rs->sr_err;
2468                 }
2469                 sop = ch_malloc( sizeof( syncops ));
2470                 *sop = so;
2471                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2472                 sop->s_rid = srs->sr_state.rid;
2473                 sop->s_sid = srs->sr_state.sid;
2474                 /* set refcount=2 to prevent being freed out from under us
2475                  * by abandons that occur while we're running here
2476                  */
2477                 sop->s_inuse = 2;
2478
2479                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2480                 while ( si->si_active ) {
2481                         /* Wait for active mods to finish before proceeding, as they
2482                          * may already have inspected the si_ops list looking for
2483                          * consumers to replicate the change to.  Using the log
2484                          * doesn't help, as we may finish playing it before the
2485                          * active mods gets added to it.
2486                          */
2487                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2488                         if ( slapd_shutdown ) {
2489                                 ch_free( sop );
2490                                 return SLAPD_ABANDON;
2491                         }
2492                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2493                                 ldap_pvt_thread_yield();
2494                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2495                 }
2496                 sop->s_next = si->si_ops;
2497                 si->si_ops = sop;
2498                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2499         }
2500
2501         /* snapshot the ctxcsn */
2502         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2503         numcsns = si->si_numcsns;
2504         if ( numcsns ) {
2505                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2506                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2507                 for ( i=0; i<numcsns; i++ )
2508                         sids[i] = si->si_sids[i];
2509         } else {
2510                 ctxcsn = NULL;
2511                 sids = NULL;
2512         }
2513         dirty = si->si_dirty;
2514         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2515
2516         /* If we have a cookie, handle the PRESENT lookups */
2517         if ( srs->sr_state.ctxcsn ) {
2518                 sessionlog *sl;
2519                 int i, j;
2520
2521                 /* If we don't have any CSN of our own yet, pretend nothing
2522                  * has changed.
2523                  */
2524                 if ( !numcsns )
2525                         goto no_change;
2526
2527                 if ( !si->si_nopres )
2528                         do_present = SS_PRESENT;
2529
2530                 /* If there are SIDs we don't recognize in the cookie, drop them */
2531                 for (i=0; i<srs->sr_state.numcsns; ) {
2532                         for (j=i; j<numcsns; j++) {
2533                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2534                                         break;
2535                                 }
2536                         }
2537                         /* not found */
2538                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2539                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2540                                 srs->sr_state.numcsns--;
2541                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2542                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2543                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2544                                 }
2545                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2546                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2547                                 continue;
2548                         }
2549                         i++;
2550                 }
2551
2552                 if (srs->sr_state.numcsns != numcsns) {
2553                         /* consumer doesn't have the right number of CSNs */
2554                         changed = SS_CHANGED;
2555                         if ( srs->sr_state.ctxcsn ) {
2556                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2557                                 srs->sr_state.ctxcsn = NULL;
2558                         }
2559                         if ( srs->sr_state.sids ) {
2560                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2561                                 srs->sr_state.sids = NULL;
2562                         }
2563                         srs->sr_state.numcsns = 0;
2564                         goto shortcut;
2565                 }
2566
2567                 /* Find the smallest CSN which differs from contextCSN */
2568                 mincsn.bv_len = 0;
2569                 maxcsn.bv_len = 0;
2570                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2571                         int newer;
2572                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2573                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2574                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2575                                 maxcsn = srs->sr_state.ctxcsn[i];
2576                                 maxsid = sids[j];
2577                         }
2578                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2579                         /* If our state is newer, tell consumer about changes */
2580                         if ( newer < 0) {
2581                                 changed = SS_CHANGED;
2582                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2583                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2584                                         mincsn = srs->sr_state.ctxcsn[i];
2585                                         minsid = sids[j];
2586                                 }
2587                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2588                         /* our state is older, complain to consumer */
2589                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2590                                 rs->sr_text = "consumer state is newer than provider!";
2591 bailout:
2592                                 if ( sop ) {
2593                                         syncops **sp = &si->si_ops;
2594
2595                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2596                                         while ( *sp != sop )
2597                                                 sp = &(*sp)->s_next;
2598                                         *sp = sop->s_next;
2599                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2600                                         ch_free( sop );
2601                                 }
2602                                 rs->sr_ctrls = NULL;
2603                                 send_ldap_result( op, rs );
2604                                 return rs->sr_err;
2605                         }
2606                 }
2607                 if ( BER_BVISEMPTY( &mincsn )) {
2608                         mincsn = maxcsn;
2609                         minsid = maxsid;
2610                 }
2611
2612                 /* If nothing has changed, shortcut it */
2613                 if ( !changed && !dirty ) {
2614                         do_present = 0;
2615 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2616                                 LDAPControl     *ctrls[2];
2617
2618                                 ctrls[0] = NULL;
2619                                 ctrls[1] = NULL;
2620                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2621                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2622                                 rs->sr_ctrls = ctrls;
2623                                 rs->sr_err = LDAP_SUCCESS;
2624                                 send_ldap_result( op, rs );
2625                                 rs->sr_ctrls = NULL;
2626                                 return rs->sr_err;
2627                         }
2628                         goto shortcut;
2629                 }
2630
2631                 /* Do we have a sessionlog for this search? */
2632                 sl=si->si_logs;
2633                 if ( sl ) {
2634                         int do_play = 0;
2635                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2636                         /* Are there any log entries, and is the consumer state
2637                          * present in the session log?
2638                          */
2639                         if ( sl->sl_num > 0 ) {
2640                                 int i;
2641                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2642                                         /* SID not present == new enough */
2643                                         if ( minsid < sl->sl_sids[i] ) {
2644                                                 do_play = 1;
2645                                                 break;
2646                                         }
2647                                         /* SID present */
2648                                         if ( minsid == sl->sl_sids[i] ) {
2649                                                 /* new enough? */
2650                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2651                                                         do_play = 1;
2652                                                 break;
2653                                         }
2654                                 }
2655                                 /* SID not present == new enough */
2656                                 if ( i == sl->sl_numcsns )
2657                                         do_play = 1;
2658                         }
2659                         if ( do_play ) {
2660                                 do_present = 0;
2661                                 /* mutex is unlocked in playlog */
2662                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2663                         } else {
2664                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2665                         }
2666                 }
2667                 /* Is the CSN still present in the database? */
2668                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2669                         /* No, so a reload is required */
2670                         /* the 2.2 consumer doesn't send this hint */
2671                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2672                                 if ( ctxcsn )
2673                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2674                                 if ( sids )
2675                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2676                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2677                                 rs->sr_text = "sync cookie is stale";
2678                                 goto bailout;
2679                         }
2680                         if ( srs->sr_state.ctxcsn ) {
2681                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2682                                 srs->sr_state.ctxcsn = NULL;
2683                         }
2684                         if ( srs->sr_state.sids ) {
2685                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2686                                 srs->sr_state.sids = NULL;
2687                         }
2688                         srs->sr_state.numcsns = 0;
2689                 } else {
2690                         gotstate = 1;
2691                         /* If changed and doing Present lookup, send Present UUIDs */
2692                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2693                                 LDAP_SUCCESS ) {
2694                                 if ( ctxcsn )
2695                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2696                                 if ( sids )
2697                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2698                                 goto bailout;
2699                         }
2700                 }
2701         } else {
2702                 /* No consumer state, assume something has changed */
2703                 changed = SS_CHANGED;
2704         }
2705
2706 shortcut:
2707         /* Append CSN range to search filter, save original filter
2708          * for persistent search evaluation
2709          */
2710         if ( sop ) {
2711                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2712                 sop->s_filterstr = op->ors_filterstr;
2713                 /* correct the refcount that was set to 2 before */
2714                 sop->s_inuse--;
2715         }
2716
2717         /* If something changed, find the changes */
2718         if ( gotstate && ( changed || dirty ) ) {
2719                 Filter *fand, *fava;
2720
2721                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2722                 fand->f_choice = LDAP_FILTER_AND;
2723                 fand->f_next = NULL;
2724                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2725                 fand->f_and = fava;
2726                 fava->f_choice = LDAP_FILTER_GE;
2727                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2728                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2729 #ifdef LDAP_COMP_MATCH
2730                 fava->f_ava->aa_cf = NULL;
2731 #endif
2732                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2733                 fava->f_next = op->ors_filter;
2734                 op->ors_filter = fand;
2735                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2736                 if ( sop ) {
2737                         sop->s_flags |= PS_FIX_FILTER;
2738                 }
2739         }
2740         if ( sop ) {
2741                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2742         }
2743
2744         /* Let our callback add needed info to returned entries */
2745         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2746         ss = (searchstate *)(cb+1);
2747         ss->ss_on = on;
2748         ss->ss_so = sop;
2749         ss->ss_flags = do_present | changed;
2750         ss->ss_ctxcsn = ctxcsn;
2751         ss->ss_numcsns = numcsns;
2752         ss->ss_sids = sids;
2753         cb->sc_response = syncprov_search_response;
2754         cb->sc_private = ss;
2755         cb->sc_next = op->o_callback;
2756         op->o_callback = cb;
2757
2758         /* If this is a persistent search and no changes were reported during
2759          * the refresh phase, just invoke the response callback to transition
2760          * us into persist phase
2761          */
2762         if ( !changed && !dirty ) {
2763                 rs->sr_err = LDAP_SUCCESS;
2764                 rs->sr_nentries = 0;
2765                 send_ldap_result( op, rs );
2766                 return rs->sr_err;
2767         }
2768         return SLAP_CB_CONTINUE;
2769 }
2770
2771 static int
2772 syncprov_operational(
2773         Operation *op,
2774         SlapReply *rs )
2775 {
2776         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2777         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2778
2779         /* This prevents generating unnecessarily; frontend will strip
2780          * any statically stored copy.
2781          */
2782         if ( op->o_sync != SLAP_CONTROL_NONE )
2783                 return SLAP_CB_CONTINUE;
2784
2785         if ( rs->sr_entry &&
2786                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2787
2788                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2789                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2790                         Attribute *a, **ap = NULL;
2791
2792                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2793                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2794                                         break;
2795                         }
2796
2797                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2798                         if ( si->si_ctxcsn ) {
2799                                 if ( !a ) {
2800                                         for ( ap = &rs->sr_operational_attrs; *ap;
2801                                                 ap=&(*ap)->a_next );
2802
2803                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2804                                         *ap = a;
2805                                 }
2806
2807                                 if ( !ap ) {
2808                                         if ( rs_entry2modifiable( op, rs, on )) {
2809                                                 a = attr_find( rs->sr_entry->e_attrs,
2810                                                         slap_schema.si_ad_contextCSN );
2811                                         }
2812                                         if ( a->a_nvals != a->a_vals ) {
2813                                                 ber_bvarray_free( a->a_nvals );
2814                                         }
2815                                         a->a_nvals = NULL;
2816                                         ber_bvarray_free( a->a_vals );
2817                                         a->a_vals = NULL;
2818                                         a->a_numvals = 0;
2819                                 }
2820                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2821                         }
2822                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2823                 }
2824         }
2825         return SLAP_CB_CONTINUE;
2826 }
2827
2828 enum {
2829         SP_CHKPT = 1,
2830         SP_SESSL,
2831         SP_NOPRES,
2832         SP_USEHINT
2833 };
2834
2835 static ConfigDriver sp_cf_gen;
2836
2837 static ConfigTable spcfg[] = {
2838         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2839                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2840                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2841                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2842         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2843                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2844                         "DESC 'Session log size in ops' "
2845                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2846         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2847                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2848                         "DESC 'Omit Present phase processing' "
2849                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2850         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2851                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2852                         "DESC 'Observe Reload Hint in Request control' "
2853                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2854         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2855 };
2856
2857 static ConfigOCs spocs[] = {
2858         { "( OLcfgOvOc:1.1 "
2859                 "NAME 'olcSyncProvConfig' "
2860                 "DESC 'SyncRepl Provider configuration' "
2861                 "SUP olcOverlayConfig "
2862                 "MAY ( olcSpCheckpoint "
2863                         "$ olcSpSessionlog "
2864                         "$ olcSpNoPresent "
2865                         "$ olcSpReloadHint "
2866                 ") )",
2867                         Cft_Overlay, spcfg },
2868         { NULL, 0, NULL }
2869 };
2870
2871 static int
2872 sp_cf_gen(ConfigArgs *c)
2873 {
2874         slap_overinst           *on = (slap_overinst *)c->bi;
2875         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2876         int rc = 0;
2877
2878         if ( c->op == SLAP_CONFIG_EMIT ) {
2879                 switch ( c->type ) {
2880                 case SP_CHKPT:
2881                         if ( si->si_chkops || si->si_chktime ) {
2882                                 struct berval bv;
2883                                 /* we assume si_chktime is a multiple of 60
2884                                  * because the parsed value was originally
2885                                  * multiplied by 60 */
2886                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2887                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2888                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2889                                         rc = 1;
2890                                 } else {
2891                                         bv.bv_val = c->cr_msg;
2892                                         value_add_one( &c->rvalue_vals, &bv );
2893                                 }
2894                         } else {
2895                                 rc = 1;
2896                         }
2897                         break;
2898                 case SP_SESSL:
2899                         if ( si->si_logs ) {
2900                                 c->value_int = si->si_logs->sl_size;
2901                         } else {
2902                                 rc = 1;
2903                         }
2904                         break;
2905                 case SP_NOPRES:
2906                         if ( si->si_nopres ) {
2907                                 c->value_int = 1;
2908                         } else {
2909                                 rc = 1;
2910                         }
2911                         break;
2912                 case SP_USEHINT:
2913                         if ( si->si_usehint ) {
2914                                 c->value_int = 1;
2915                         } else {
2916                                 rc = 1;
2917                         }
2918                         break;
2919                 }
2920                 return rc;
2921         } else if ( c->op == LDAP_MOD_DELETE ) {
2922                 switch ( c->type ) {
2923                 case SP_CHKPT:
2924                         si->si_chkops = 0;
2925                         si->si_chktime = 0;
2926                         break;
2927                 case SP_SESSL:
2928                         if ( si->si_logs )
2929                                 si->si_logs->sl_size = 0;
2930                         else
2931                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2932                         break;
2933                 case SP_NOPRES:
2934                         if ( si->si_nopres )
2935                                 si->si_nopres = 0;
2936                         else
2937                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2938                         break;
2939                 case SP_USEHINT:
2940                         if ( si->si_usehint )
2941                                 si->si_usehint = 0;
2942                         else
2943                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2944                         break;
2945                 }
2946                 return rc;
2947         }
2948         switch ( c->type ) {
2949         case SP_CHKPT:
2950                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2951                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2952                                 c->argv[0], c->argv[1] );
2953                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2954                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2955                         return ARG_BAD_CONF;
2956                 }
2957                 if ( si->si_chkops <= 0 ) {
2958                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2959                                 c->argv[0], si->si_chkops );
2960                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2961                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2962                         return ARG_BAD_CONF;
2963                 }
2964                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2965                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2966                                 c->argv[0], c->argv[1] );
2967                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2968                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2969                         return ARG_BAD_CONF;
2970                 }
2971                 if ( si->si_chktime <= 0 ) {
2972                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2973                                 c->argv[0], si->si_chkops );
2974                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2975                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2976                         return ARG_BAD_CONF;
2977                 }
2978                 si->si_chktime *= 60;
2979                 break;
2980         case SP_SESSL: {
2981                 sessionlog *sl;
2982                 int size = c->value_int;
2983
2984                 if ( size < 0 ) {
2985                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2986                                 c->argv[0], size );
2987                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2988                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2989                         return ARG_BAD_CONF;
2990                 }
2991                 sl = si->si_logs;
2992                 if ( !sl ) {
2993                         sl = ch_malloc( sizeof( sessionlog ));
2994                         sl->sl_mincsn = NULL;
2995                         sl->sl_sids = NULL;
2996                         sl->sl_num = 0;
2997                         sl->sl_numcsns = 0;
2998                         sl->sl_head = sl->sl_tail = NULL;
2999                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3000                         si->si_logs = sl;
3001                 }
3002                 sl->sl_size = size;
3003                 }
3004                 break;
3005         case SP_NOPRES:
3006                 si->si_nopres = c->value_int;
3007                 break;
3008         case SP_USEHINT:
3009                 si->si_usehint = c->value_int;
3010                 break;
3011         }
3012         return rc;
3013 }
3014
3015 /* ITS#3456 we cannot run this search on the main thread, must use a
3016  * child thread in order to insure we have a big enough stack.
3017  */
3018 static void *
3019 syncprov_db_otask(
3020         void *ptr
3021 )
3022 {
3023         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3024         return NULL;
3025 }
3026
3027
3028 /* Read any existing contextCSN from the underlying db.
3029  * Then search for any entries newer than that. If no value exists,
3030  * just generate it. Cache whatever result.
3031  */
3032 static int
3033 syncprov_db_open(
3034         BackendDB *be,
3035         ConfigReply *cr
3036 )
3037 {
3038         slap_overinst   *on = (slap_overinst *) be->bd_info;
3039         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3040
3041         Connection conn = { 0 };
3042         OperationBuffer opbuf;
3043         Operation *op;
3044         Entry *e = NULL;
3045         Attribute *a;
3046         int rc;
3047         void *thrctx = NULL;
3048
3049         if ( !SLAP_LASTMOD( be )) {
3050                 Debug( LDAP_DEBUG_ANY,
3051                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3052                 return -1;
3053         }
3054
3055         if ( slapMode & SLAP_TOOL_MODE ) {
3056                 return 0;
3057         }
3058
3059         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3060         if ( rc ) {
3061                 return rc;
3062         }
3063
3064         thrctx = ldap_pvt_thread_pool_context();
3065         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3066         op = &opbuf.ob_op;
3067         op->o_bd = be;
3068         op->o_dn = be->be_rootdn;
3069         op->o_ndn = be->be_rootndn;
3070
3071         if ( SLAP_SYNC_SUBENTRY( be )) {
3072                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3073                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3074         } else {
3075                 si->si_contextdn = be->be_nsuffix[0];
3076         }
3077         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3078                 slap_schema.si_ad_contextCSN, 0, &e, on );
3079
3080         if ( e ) {
3081                 ldap_pvt_thread_t tid;
3082
3083                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3084                 if ( a ) {
3085                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3086                         si->si_numcsns = a->a_numvals;
3087                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3088                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3089                 }
3090                 overlay_entry_release_ov( op, e, 0, on );
3091                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3092                         op->o_tag = LDAP_REQ_SEARCH;
3093                         op->o_req_dn = be->be_suffix[0];
3094                         op->o_req_ndn = be->be_nsuffix[0];
3095                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3096                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3097                         ldap_pvt_thread_join( tid, NULL );
3098                 }
3099         }
3100
3101         /* Didn't find a contextCSN, should we generate one? */
3102         if ( !si->si_ctxcsn ) {
3103                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3104                 struct berval csn;
3105
3106                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3107                 /* If we're also a consumer, then don't generate anything.
3108                  * Wait for our provider to send it to us, or for a local
3109                  * modify if we have multimaster.
3110                  */
3111                         goto out;
3112                 }
3113                 csn.bv_val = csnbuf;
3114                 csn.bv_len = sizeof( csnbuf );
3115                 slap_get_csn( op, &csn, 0 );
3116                 value_add_one( &si->si_ctxcsn, &csn );
3117                 si->si_numcsns = 1;
3118                 si->si_sids = ch_malloc( sizeof(int) );
3119                 si->si_sids[0] = slap_serverID;
3120
3121                 /* make sure we do a checkpoint on close */
3122                 si->si_numops++;
3123         }
3124
3125         /* Initialize the sessionlog mincsn */
3126         if ( si->si_logs && si->si_numcsns ) {
3127                 sessionlog *sl = si->si_logs;
3128                 int i;
3129                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3130                 sl->sl_numcsns = si->si_numcsns;
3131                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3132                 for ( i=0; i < si->si_numcsns; i++ )
3133                         sl->sl_sids[i] = si->si_sids[i];
3134         }
3135
3136 out:
3137         op->o_bd->bd_info = (BackendInfo *)on;
3138         return 0;
3139 }
3140
3141 /* Write the current contextCSN into the underlying db.
3142  */
3143 static int
3144 syncprov_db_close(
3145         BackendDB *be,
3146         ConfigReply *cr
3147 )
3148 {
3149     slap_overinst   *on = (slap_overinst *) be->bd_info;
3150     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3151 #ifdef SLAP_CONFIG_DELETE
3152         syncops *so, *sonext;
3153 #endif /* SLAP_CONFIG_DELETE */
3154
3155         if ( slapMode & SLAP_TOOL_MODE ) {
3156                 return 0;
3157         }
3158         if ( si->si_numops ) {
3159                 Connection conn = {0};
3160                 OperationBuffer opbuf;
3161                 Operation *op;
3162                 void *thrctx;
3163
3164                 thrctx = ldap_pvt_thread_pool_context();
3165                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3166                 op = &opbuf.ob_op;
3167                 op->o_bd = be;
3168                 op->o_dn = be->be_rootdn;
3169                 op->o_ndn = be->be_rootndn;
3170                 syncprov_checkpoint( op, on );
3171         }
3172
3173 #ifdef SLAP_CONFIG_DELETE
3174         if ( !slapd_shutdown ) {
3175                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3176                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3177                         SlapReply rs = {REP_RESULT};
3178                         rs.sr_err = LDAP_UNAVAILABLE;
3179                         send_ldap_result( so->s_op, &rs );
3180                         sonext=so->s_next;
3181                         syncprov_drop_psearch( so, 0);
3182                 }
3183                 si->si_ops=NULL;
3184                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3185         }
3186         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3187 #endif /* SLAP_CONFIG_DELETE */
3188
3189     return 0;
3190 }
3191
3192 static int
3193 syncprov_db_init(
3194         BackendDB *be,
3195         ConfigReply *cr
3196 )
3197 {
3198         slap_overinst   *on = (slap_overinst *)be->bd_info;
3199         syncprov_info_t *si;
3200
3201         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3202                 Debug( LDAP_DEBUG_ANY,
3203                         "syncprov must be instantiated within a database.\n",
3204                         0, 0, 0 );
3205                 return 1;
3206         }
3207
3208         si = ch_calloc(1, sizeof(syncprov_info_t));
3209         on->on_bi.bi_private = si;
3210         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3211         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3212         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3213         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3214
3215         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3216         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3217         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3218         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3219
3220         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3221         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3222
3223         return 0;
3224 }
3225
3226 static int
3227 syncprov_db_destroy(
3228         BackendDB *be,
3229         ConfigReply *cr
3230 )
3231 {
3232         slap_overinst   *on = (slap_overinst *)be->bd_info;
3233         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3234
3235         if ( si ) {
3236                 if ( si->si_logs ) {
3237                         sessionlog *sl = si->si_logs;
3238                         slog_entry *se = sl->sl_head;
3239
3240                         while ( se ) {
3241                                 slog_entry *se_next = se->se_next;
3242                                 ch_free( se );
3243                                 se = se_next;
3244                         }
3245                         if ( sl->sl_mincsn )
3246                                 ber_bvarray_free( sl->sl_mincsn );
3247                         if ( sl->sl_sids )
3248                                 ch_free( sl->sl_sids );
3249
3250                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3251                         ch_free( si->si_logs );
3252                 }
3253                 if ( si->si_ctxcsn )
3254                         ber_bvarray_free( si->si_ctxcsn );
3255                 if ( si->si_sids )
3256                         ch_free( si->si_sids );
3257                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3258                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3259                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3260                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3261                 ch_free( si );
3262         }
3263
3264         return 0;
3265 }
3266
3267 static int syncprov_parseCtrl (
3268         Operation *op,
3269         SlapReply *rs,
3270         LDAPControl *ctrl )
3271 {
3272         ber_tag_t tag;
3273         BerElementBuffer berbuf;
3274         BerElement *ber = (BerElement *)&berbuf;
3275         ber_int_t mode;
3276         ber_len_t len;
3277         struct berval cookie = BER_BVNULL;
3278         sync_control *sr;
3279         int rhint = 0;
3280
3281         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3282                 rs->sr_text = "Sync control specified multiple times";
3283                 return LDAP_PROTOCOL_ERROR;
3284         }
3285
3286         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3287                 rs->sr_text = "Sync control specified with pagedResults control";
3288                 return LDAP_PROTOCOL_ERROR;
3289         }
3290
3291         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3292                 rs->sr_text = "Sync control value is absent";
3293                 return LDAP_PROTOCOL_ERROR;
3294         }
3295
3296         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3297                 rs->sr_text = "Sync control value is empty";
3298                 return LDAP_PROTOCOL_ERROR;
3299         }
3300
3301         /* Parse the control value
3302          *      syncRequestValue ::= SEQUENCE {
3303          *              mode   ENUMERATED {
3304          *                      -- 0 unused
3305          *                      refreshOnly             (1),
3306          *                      -- 2 reserved
3307          *                      refreshAndPersist       (3)
3308          *              },
3309          *              cookie  syncCookie OPTIONAL
3310          *      }
3311          */
3312
3313         ber_init2( ber, &ctrl->ldctl_value, 0 );
3314
3315         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3316                 rs->sr_text = "Sync control : mode decoding error";
3317                 return LDAP_PROTOCOL_ERROR;
3318         }
3319
3320         switch( mode ) {
3321         case LDAP_SYNC_REFRESH_ONLY:
3322                 mode = SLAP_SYNC_REFRESH;
3323                 break;
3324         case LDAP_SYNC_REFRESH_AND_PERSIST:
3325                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3326                 break;
3327         default:
3328                 rs->sr_text = "Sync control : unknown update mode";
3329                 return LDAP_PROTOCOL_ERROR;
3330         }
3331
3332         tag = ber_peek_tag( ber, &len );
3333
3334         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3335                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3336                         rs->sr_text = "Sync control : cookie decoding error";
3337                         return LDAP_PROTOCOL_ERROR;
3338                 }
3339                 tag = ber_peek_tag( ber, &len );
3340         }
3341         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3342                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3343                         rs->sr_text = "Sync control : rhint decoding error";
3344                         return LDAP_PROTOCOL_ERROR;
3345                 }
3346         }
3347         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3348                         rs->sr_text = "Sync control : decoding error";
3349                         return LDAP_PROTOCOL_ERROR;
3350         }
3351         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3352         sr->sr_rhint = rhint;
3353         if (!BER_BVISNULL(&cookie)) {
3354                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3355                 /* If parse fails, pretend no cookie was sent */
3356                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3357                         sr->sr_state.rid == -1 ) {
3358                         if ( sr->sr_state.ctxcsn ) {
3359                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3360                                 sr->sr_state.ctxcsn = NULL;
3361                         }
3362                         sr->sr_state.numcsns = 0;
3363                 }
3364         }
3365
3366         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3367
3368         op->o_sync = ctrl->ldctl_iscritical
3369                 ? SLAP_CONTROL_CRITICAL
3370                 : SLAP_CONTROL_NONCRITICAL;
3371
3372         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3373
3374         return LDAP_SUCCESS;
3375 }
3376
3377 /* This overlay is set up for dynamic loading via moduleload. For static
3378  * configuration, you'll need to arrange for the slap_overinst to be
3379  * initialized and registered by some other function inside slapd.
3380  */
3381
3382 static slap_overinst            syncprov;
3383
3384 int
3385 syncprov_initialize()
3386 {
3387         int rc;
3388
3389         rc = register_supported_control( LDAP_CONTROL_SYNC,
3390                 SLAP_CTRL_SEARCH, NULL,
3391                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3392         if ( rc != LDAP_SUCCESS ) {
3393                 Debug( LDAP_DEBUG_ANY,
3394                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3395                 return rc;
3396         }
3397
3398         syncprov.on_bi.bi_type = "syncprov";
3399         syncprov.on_bi.bi_db_init = syncprov_db_init;
3400         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3401         syncprov.on_bi.bi_db_open = syncprov_db_open;
3402         syncprov.on_bi.bi_db_close = syncprov_db_close;
3403
3404         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3405         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3406
3407         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3408         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3409         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3410         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3411         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3412         syncprov.on_bi.bi_op_search = syncprov_op_search;
3413         syncprov.on_bi.bi_extended = syncprov_op_extended;
3414         syncprov.on_bi.bi_operational = syncprov_operational;
3415
3416         syncprov.on_bi.bi_cf_ocs = spocs;
3417
3418         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3419
3420         rc = config_register_schema( spcfg, spocs );
3421         if ( rc ) return rc;
3422
3423         return overlay_register( &syncprov );
3424 }
3425
3426 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3427 int
3428 init_module( int argc, char *argv[] )
3429 {
3430         return syncprov_initialize();
3431 }
3432 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3433
3434 #endif /* defined(SLAPD_OVER_SYNCPROV) */