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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2014 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #define CHECK_CSN       1
  32
  33 /* A modify request on a particular entry */
  34 typedef struct modinst {
  35         struct modinst *mi_next;
  36         Operation *mi_op;
  37 } modinst;
  38
  39 typedef struct modtarget {
  40         struct modinst *mt_mods;
  41         struct modinst *mt_tail;
  42         struct berval mt_dn;
  43         ldap_pvt_thread_mutex_t mt_mutex;
  44 } modtarget;
  45
  46 /* All the info of a psearch result that's shared between
  47  * multiple queues
  48  */
  49 typedef struct resinfo {
  50         struct syncres *ri_list;
  51         Entry *ri_e;
  52         struct berval ri_dn;
  53         struct berval ri_ndn;
  54         struct berval ri_uuid;
  55         struct berval ri_csn;
  56         struct berval ri_cookie;
  57         char ri_isref;
  58         ldap_pvt_thread_mutex_t ri_mutex;
  59 } resinfo;
  60
  61 /* A queued result of a persistent search */
  62 typedef struct syncres {
  63         struct syncres *s_next; /* list of results on this psearch queue */
  64         struct syncres *s_rilist;       /* list of psearches using this result */
  65         resinfo *s_info;
  66         char s_mode;
  67 } syncres;
  68
  69 /* Record of a persistent search */
  70 typedef struct syncops {
  71         struct syncops *s_next;
  72         struct syncprov_info_t *s_si;
  73         struct berval   s_base;         /* ndn of search base */
  74         ID              s_eid;          /* entryID of search base */
  75         Operation       *s_op;          /* search op */
  76         int             s_rid;
  77         int             s_sid;
  78         struct berval s_filterstr;
  79         int             s_flags;        /* search status */
  80 #define PS_IS_REFRESHING        0x01
  81 #define PS_IS_DETACHED          0x02
  82 #define PS_WROTE_BASE           0x04
  83 #define PS_FIND_BASE            0x08
  84 #define PS_FIX_FILTER           0x10
  85 #define PS_TASK_QUEUED          0x20
  86
  87         int             s_inuse;        /* reference count */
  88         struct syncres *s_res;
  89         struct syncres *s_restail;
  90         ldap_pvt_thread_mutex_t s_mutex;
  91 } syncops;
  92
  93 /* A received sync control */
  94 typedef struct sync_control {
  95         struct sync_cookie sr_state;
  96         int sr_rhint;
  97 } sync_control;
  98
  99 #if 0 /* moved back to slap.h */
 100 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 101 #endif
 102 /* o_sync_mode uses data bits of o_sync */
 103 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 104
 105 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 106 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 107 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 108 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 109
 110 /* Record of which searches matched at premodify step */
 111 typedef struct syncmatches {
 112         struct syncmatches *sm_next;
 113         syncops *sm_op;
 114 } syncmatches;
 115
 116 /* Session log data */
 117 typedef struct slog_entry {
 118         struct slog_entry *se_next;
 119         struct berval se_uuid;
 120         struct berval se_csn;
 121         int     se_sid;
 122         ber_tag_t       se_tag;
 123 } slog_entry;
 124
 125 typedef struct sessionlog {
 126         BerVarray       sl_mincsn;
 127         int             *sl_sids;
 128         int             sl_numcsns;
 129         int             sl_num;
 130         int             sl_size;
 131         slog_entry *sl_head;
 132         slog_entry *sl_tail;
 133         ldap_pvt_thread_mutex_t sl_mutex;
 134 } sessionlog;
 135
 136 /* The main state for this overlay */
 137 typedef struct syncprov_info_t {
 138         syncops         *si_ops;
 139         struct berval   si_contextdn;
 140         BerVarray       si_ctxcsn;      /* ldapsync context */
 141         int             *si_sids;
 142         int             si_numcsns;
 143         int             si_chkops;      /* checkpointing info */
 144         int             si_chktime;
 145         int             si_numops;      /* number of ops since last checkpoint */
 146         int             si_nopres;      /* Skip present phase */
 147         int             si_usehint;     /* use reload hint */
 148         int             si_active;      /* True if there are active mods */
 149         int             si_dirty;       /* True if the context is dirty, i.e changes
 150                                                  * have been made without updating the csn. */
 151         time_t  si_chklast;     /* time of last checkpoint */
 152         Avlnode *si_mods;       /* entries being modified */
 153         sessionlog      *si_logs;
 154         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 155         ldap_pvt_thread_mutex_t si_ops_mutex;
 156         ldap_pvt_thread_mutex_t si_mods_mutex;
 157         ldap_pvt_thread_mutex_t si_resp_mutex;
 158 } syncprov_info_t;
 159
 160 typedef struct opcookie {
 161         slap_overinst *son;
 162         syncmatches *smatches;
 163         modtarget *smt;
 164         Entry *se;
 165         struct berval sdn;      /* DN of entry, for deletes */
 166         struct berval sndn;
 167         struct berval suuid;    /* UUID of entry */
 168         struct berval sctxcsn;
 169         short osid;     /* sid of op csn */
 170         short rsid;     /* sid of relay */
 171         short sreference;       /* Is the entry a reference? */
 172         syncres ssres;
 173 } opcookie;
 174
 175 typedef struct fbase_cookie {
 176         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 177         syncops *fss;   /* persistent search we're testing against */
 178         int fbase;      /* if TRUE we found the search base and it's still valid */
 179         int fscope;     /* if TRUE then fdn is within the psearch scope */
 180 } fbase_cookie;
 181
 182 static AttributeName csn_anlist[3];
 183 static AttributeName uuid_anlist[2];
 184
 185 /* Build a LDAPsync intermediate state control */
 186 static int
 187 syncprov_state_ctrl(
 188         Operation       *op,
 189         SlapReply       *rs,
 190         Entry           *e,
 191         int             entry_sync_state,
 192         LDAPControl     **ctrls,
 193         int             num_ctrls,
 194         int             send_cookie,
 195         struct berval   *cookie )
 196 {
 197         Attribute* a;
 198         int ret;
 199
 200         BerElementBuffer berbuf;
 201         BerElement *ber = (BerElement *)&berbuf;
 202         LDAPControl *cp;
 203         struct berval bv;
 204         struct berval   entryuuid_bv = BER_BVNULL;
 205
 206         ber_init2( ber, 0, LBER_USE_DER );
 207         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 208
 209         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 210                 AttributeDescription *desc = a->a_desc;
 211                 if ( desc == slap_schema.si_ad_entryUUID ) {
 212                         entryuuid_bv = a->a_nvals[0];
 213                         break;
 214                 }
 215         }
 216
 217         /* FIXME: what if entryuuid is NULL or empty ? */
 218
 219         if ( send_cookie && cookie ) {
 220                 ber_printf( ber, "{eOON}",
 221                         entry_sync_state, &entryuuid_bv, cookie );
 222         } else {
 223                 ber_printf( ber, "{eON}",
 224                         entry_sync_state, &entryuuid_bv );
 225         }
 226
 227         ret = ber_flatten2( ber, &bv, 0 );
 228         if ( ret == 0 ) {
 229                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 230                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 231                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 232                 cp->ldctl_value.bv_val = (char *)&cp[1];
 233                 cp->ldctl_value.bv_len = bv.bv_len;
 234                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 235                 ctrls[num_ctrls] = cp;
 236         }
 237         ber_free_buf( ber );
 238
 239         if ( ret < 0 ) {
 240                 Debug( LDAP_DEBUG_TRACE,
 241                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 242                         ret, 0, 0 );
 243                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 244                 return LDAP_OTHER;
 245         }
 246
 247         return LDAP_SUCCESS;
 248 }
 249
 250 /* Build a LDAPsync final state control */
 251 static int
 252 syncprov_done_ctrl(
 253         Operation       *op,
 254         SlapReply       *rs,
 255         LDAPControl     **ctrls,
 256         int                     num_ctrls,
 257         int                     send_cookie,
 258         struct berval *cookie,
 259         int                     refreshDeletes )
 260 {
 261         int ret;
 262         BerElementBuffer berbuf;
 263         BerElement *ber = (BerElement *)&berbuf;
 264         LDAPControl *cp;
 265         struct berval bv;
 266
 267         ber_init2( ber, NULL, LBER_USE_DER );
 268         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 269
 270         ber_printf( ber, "{" );
 271         if ( send_cookie && cookie ) {
 272                 ber_printf( ber, "O", cookie );
 273         }
 274         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 275                 ber_printf( ber, "b", refreshDeletes );
 276         }
 277         ber_printf( ber, "N}" );
 278
 279         ret = ber_flatten2( ber, &bv, 0 );
 280         if ( ret == 0 ) {
 281                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 282                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 283                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 284                 cp->ldctl_value.bv_val = (char *)&cp[1];
 285                 cp->ldctl_value.bv_len = bv.bv_len;
 286                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 287                 ctrls[num_ctrls] = cp;
 288         }
 289
 290         ber_free_buf( ber );
 291
 292         if ( ret < 0 ) {
 293                 Debug( LDAP_DEBUG_TRACE,
 294                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 295                         ret, 0, 0 );
 296                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 297                 return LDAP_OTHER;
 298         }
 299
 300         return LDAP_SUCCESS;
 301 }
 302
 303 static int
 304 syncprov_sendinfo(
 305         Operation       *op,
 306         SlapReply       *rs,
 307         int                     type,
 308         struct berval *cookie,
 309         int                     refreshDone,
 310         BerVarray       syncUUIDs,
 311         int                     refreshDeletes )
 312 {
 313         BerElementBuffer berbuf;
 314         BerElement *ber = (BerElement *)&berbuf;
 315         struct berval rspdata;
 316
 317         int ret;
 318
 319         ber_init2( ber, NULL, LBER_USE_DER );
 320         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 321
 322         if ( type ) {
 323                 switch ( type ) {
 324                 case LDAP_TAG_SYNC_NEW_COOKIE:
 325                         ber_printf( ber, "tO", type, cookie );
 326                         break;
 327                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 328                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 329                         ber_printf( ber, "t{", type );
 330                         if ( cookie ) {
 331                                 ber_printf( ber, "O", cookie );
 332                         }
 333                         if ( refreshDone == 0 ) {
 334                                 ber_printf( ber, "b", refreshDone );
 335                         }
 336                         ber_printf( ber, "N}" );
 337                         break;
 338                 case LDAP_TAG_SYNC_ID_SET:
 339                         ber_printf( ber, "t{", type );
 340                         if ( cookie ) {
 341                                 ber_printf( ber, "O", cookie );
 342                         }
 343                         if ( refreshDeletes == 1 ) {
 344                                 ber_printf( ber, "b", refreshDeletes );
 345                         }
 346                         ber_printf( ber, "[W]", syncUUIDs );
 347                         ber_printf( ber, "N}" );
 348                         break;
 349                 default:
 350                         Debug( LDAP_DEBUG_TRACE,
 351                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 352                                 type, 0, 0 );
 353                         return LDAP_OTHER;
 354                 }
 355         }
 356
 357         ret = ber_flatten2( ber, &rspdata, 0 );
 358
 359         if ( ret < 0 ) {
 360                 Debug( LDAP_DEBUG_TRACE,
 361                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 362                         ret, 0, 0 );
 363                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 364                 return LDAP_OTHER;
 365         }
 366
 367         rs->sr_rspoid = LDAP_SYNC_INFO;
 368         rs->sr_rspdata = &rspdata;
 369         send_ldap_intermediate( op, rs );
 370         rs->sr_rspdata = NULL;
 371         ber_free_buf( ber );
 372
 373         return LDAP_SUCCESS;
 374 }
 375
 376 /* Find a modtarget in an AVL tree */
 377 static int
 378 sp_avl_cmp( const void *c1, const void *c2 )
 379 {
 380         const modtarget *m1, *m2;
 381         int rc;
 382
 383         m1 = c1; m2 = c2;
 384         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 385
 386         if ( rc ) return rc;
 387         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 388 }
 389
 390 /* syncprov_findbase:
 391  *   finds the true DN of the base of a search (with alias dereferencing) and
 392  * checks to make sure the base entry doesn't get replaced with a different
 393  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 394  * change is detected, any persistent search on this base must be terminated /
 395  * reloaded.
 396  *   On the first call, we just save the DN and entryID. On subsequent calls
 397  * we compare the DN and entryID with the saved values.
 398  */
 399 static int
 400 findbase_cb( Operation *op, SlapReply *rs )
 401 {
 402         slap_callback *sc = op->o_callback;
 403
 404         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 405                 fbase_cookie *fc = sc->sc_private;
 406
 407                 /* If no entryID, we're looking for the first time.
 408                  * Just store whatever we got.
 409                  */
 410                 if ( fc->fss->s_eid == NOID ) {
 411                         fc->fbase = 2;
 412                         fc->fss->s_eid = rs->sr_entry->e_id;
 413                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 414
 415                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 416                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 417
 418                 /* OK, the DN is the same and the entryID is the same. */
 419                         fc->fbase = 1;
 420                 }
 421         }
 422         if ( rs->sr_err != LDAP_SUCCESS ) {
 423                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 424         }
 425         return LDAP_SUCCESS;
 426 }
 427
 428 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 429 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 430
 431 static int
 432 syncprov_findbase( Operation *op, fbase_cookie *fc )
 433 {
 434         /* Use basic parameters from syncrepl search, but use
 435          * current op's threadctx / tmpmemctx
 436          */
 437         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 438         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 439                 slap_callback cb = {0};
 440                 Operation fop;
 441                 SlapReply frs = { REP_RESULT };
 442                 int rc;
 443
 444                 fc->fss->s_flags ^= PS_FIND_BASE;
 445                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 446
 447                 fop = *fc->fss->s_op;
 448
 449                 fop.o_bd = fop.o_bd->bd_self;
 450                 fop.o_hdr = op->o_hdr;
 451                 fop.o_time = op->o_time;
 452                 fop.o_tincr = op->o_tincr;
 453                 fop.o_extra = op->o_extra;
 454
 455                 cb.sc_response = findbase_cb;
 456                 cb.sc_private = fc;
 457
 458                 fop.o_sync_mode = 0;    /* turn off sync mode */
 459                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 460                 fop.o_callback = &cb;
 461                 fop.o_tag = LDAP_REQ_SEARCH;
 462                 fop.ors_scope = LDAP_SCOPE_BASE;
 463                 fop.ors_limit = NULL;
 464                 fop.ors_slimit = 1;
 465                 fop.ors_tlimit = SLAP_NO_LIMIT;
 466                 fop.ors_attrs = slap_anlist_no_attrs;
 467                 fop.ors_attrsonly = 1;
 468                 fop.ors_filter = &generic_filter;
 469                 fop.ors_filterstr = generic_filterstr;
 470
 471                 rc = fop.o_bd->be_search( &fop, &frs );
 472         } else {
 473                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 474                 fc->fbase = 1;
 475         }
 476
 477         /* After the first call, see if the fdn resides in the scope */
 478         if ( fc->fbase == 1 ) {
 479                 switch ( fc->fss->s_op->ors_scope ) {
 480                 case LDAP_SCOPE_BASE:
 481                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 482                         break;
 483                 case LDAP_SCOPE_ONELEVEL: {
 484                         struct berval pdn;
 485                         dnParent( fc->fdn, &pdn );
 486                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 487                         break; }
 488                 case LDAP_SCOPE_SUBTREE:
 489                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 490                         break;
 491                 case LDAP_SCOPE_SUBORDINATE:
 492                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 493                                 !dn_match( fc->fdn, &fc->fss->s_base );
 494                         break;
 495                 }
 496         }
 497
 498         if ( fc->fbase )
 499                 return LDAP_SUCCESS;
 500
 501         /* If entryID has changed, then the base of this search has
 502          * changed. Invalidate the psearch.
 503          */
 504         return LDAP_NO_SUCH_OBJECT;
 505 }
 506
 507 /* syncprov_findcsn:
 508  *   This function has three different purposes, but they all use a search
 509  * that filters on entryCSN so they're combined here.
 510  * 1: at startup time, after a contextCSN has been read from the database,
 511  * we search for all entries with CSN >= contextCSN in case the contextCSN
 512  * was not checkpointed at the previous shutdown.
 513  *
 514  * 2: when the current contextCSN is known and we have a sync cookie, we search
 515  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 516  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 517  *
 518  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 519  * CSN, and generate Present records for them. We always collect this result
 520  * in SyncID sets, even if there's only one match.
 521  */
 522 typedef enum find_csn_t {
 523         FIND_MAXCSN     = 1,
 524         FIND_CSN        = 2,
 525         FIND_PRESENT    = 3
 526 } find_csn_t;
 527
 528 static int
 529 findmax_cb( Operation *op, SlapReply *rs )
 530 {
 531         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 532                 struct berval *maxcsn = op->o_callback->sc_private;
 533                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 534                         slap_schema.si_ad_entryCSN );
 535
 536                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 537                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 538                         maxcsn->bv_len = a->a_vals[0].bv_len;
 539                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 540                 }
 541         }
 542         return LDAP_SUCCESS;
 543 }
 544
 545 static int
 546 findcsn_cb( Operation *op, SlapReply *rs )
 547 {
 548         slap_callback *sc = op->o_callback;
 549
 550         /* We just want to know that at least one exists, so it's OK if
 551          * we exceed the unchecked limit.
 552          */
 553         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 554                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 555                 sc->sc_private = (void *)1;
 556         }
 557         return LDAP_SUCCESS;
 558 }
 559
 560 /* Build a list of entryUUIDs for sending in a SyncID set */
 561
 562 #define UUID_LEN        16
 563
 564 typedef struct fpres_cookie {
 565         int num;
 566         BerVarray uuids;
 567         char *last;
 568 } fpres_cookie;
 569
 570 static int
 571 findpres_cb( Operation *op, SlapReply *rs )
 572 {
 573         slap_callback *sc = op->o_callback;
 574         fpres_cookie *pc = sc->sc_private;
 575         Attribute *a;
 576         int ret = SLAP_CB_CONTINUE;
 577
 578         switch ( rs->sr_type ) {
 579         case REP_SEARCH:
 580                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 581                 if ( a ) {
 582                         pc->uuids[pc->num].bv_val = pc->last;
 583                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 584                                 pc->uuids[pc->num].bv_len );
 585                         pc->num++;
 586                         pc->last = pc->uuids[pc->num].bv_val;
 587                         pc->uuids[pc->num].bv_val = NULL;
 588                 }
 589                 ret = LDAP_SUCCESS;
 590                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 591                         break;
 592                 /* FALLTHRU */
 593         case REP_RESULT:
 594                 ret = rs->sr_err;
 595                 if ( pc->num ) {
 596                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 597                                 0, pc->uuids, 0 );
 598                         pc->uuids[pc->num].bv_val = pc->last;
 599                         pc->num = 0;
 600                         pc->last = pc->uuids[0].bv_val;
 601                 }
 602                 break;
 603         default:
 604                 break;
 605         }
 606         return ret;
 607 }
 608
 609 static int
 610 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 611 {
 612         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 613         syncprov_info_t         *si = on->on_bi.bi_private;
 614
 615         slap_callback cb = {0};
 616         Operation fop;
 617         SlapReply frs = { REP_RESULT };
 618         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 619         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 620         struct berval maxcsn;
 621         Filter cf;
 622         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 623         fpres_cookie pcookie;
 624         sync_control *srs = NULL;
 625         struct slap_limits_set fc_limits;
 626         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 627         int maxid;
 628
 629         if ( mode != FIND_MAXCSN ) {
 630                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 631         }
 632
 633         fop = *op;
 634         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 635         /* We want pure entries, not referrals */
 636         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 637
 638         cf.f_ava = &eq;
 639         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 640         BER_BVZERO( &cf.f_av_value );
 641         cf.f_next = NULL;
 642
 643         fop.o_callback = &cb;
 644         fop.ors_limit = NULL;
 645         fop.ors_tlimit = SLAP_NO_LIMIT;
 646         fop.ors_filter = &cf;
 647         fop.ors_filterstr.bv_val = buf;
 648
 649 again:
 650         switch( mode ) {
 651         case FIND_MAXCSN:
 652                 cf.f_choice = LDAP_FILTER_GE;
 653                 /* If there are multiple CSNs, use the one with our serverID */
 654                 for ( i=0; i<si->si_numcsns; i++) {
 655                         if ( slap_serverID == si->si_sids[i] ) {
 656                                 maxid = i;
 657                                 break;
 658                         }
 659                 }
 660                 if ( i == si->si_numcsns ) {
 661                         /* No match: this is multimaster, and none of the content in the DB
 662                          * originated locally. Treat like no CSN.
 663                          */
 664                         return LDAP_NO_SUCH_OBJECT;
 665                 }
 666                 cf.f_av_value = si->si_ctxcsn[maxid];
 667                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 668                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 669                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 670                         return LDAP_OTHER;
 671                 }
 672                 fop.ors_attrsonly = 0;
 673                 fop.ors_attrs = csn_anlist;
 674                 fop.ors_slimit = SLAP_NO_LIMIT;
 675                 cb.sc_private = &maxcsn;
 676                 cb.sc_response = findmax_cb;
 677                 strcpy( cbuf, cf.f_av_value.bv_val );
 678                 maxcsn.bv_val = cbuf;
 679                 maxcsn.bv_len = cf.f_av_value.bv_len;
 680                 break;
 681         case FIND_CSN:
 682                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 683                         cf.f_av_value = *csn;
 684                 }
 685                 fop.o_dn = op->o_bd->be_rootdn;
 686                 fop.o_ndn = op->o_bd->be_rootndn;
 687                 fop.o_req_dn = op->o_bd->be_suffix[0];
 688                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 689                 /* Look for exact match the first time */
 690                 if ( findcsn_retry ) {
 691                         cf.f_choice = LDAP_FILTER_EQUALITY;
 692                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 693                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 694                 /* On retry, look for <= */
 695                 } else {
 696                         cf.f_choice = LDAP_FILTER_LE;
 697                         fop.ors_limit = &fc_limits;
 698                         memset( &fc_limits, 0, sizeof( fc_limits ));
 699                         fc_limits.lms_s_unchecked = 1;
 700                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 701                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 702                 }
 703                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 704                         return LDAP_OTHER;
 705                 }
 706                 fop.ors_attrsonly = 1;
 707                 fop.ors_attrs = slap_anlist_no_attrs;
 708                 fop.ors_slimit = 1;
 709                 cb.sc_private = NULL;
 710                 cb.sc_response = findcsn_cb;
 711                 break;
 712         case FIND_PRESENT:
 713                 fop.ors_filter = op->ors_filter;
 714                 fop.ors_filterstr = op->ors_filterstr;
 715                 fop.ors_attrsonly = 0;
 716                 fop.ors_attrs = uuid_anlist;
 717                 fop.ors_slimit = SLAP_NO_LIMIT;
 718                 cb.sc_private = &pcookie;
 719                 cb.sc_response = findpres_cb;
 720                 pcookie.num = 0;
 721
 722                 /* preallocate storage for a full set */
 723                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 724                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 725                         op->o_tmpmemctx );
 726                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 727                 pcookie.uuids[0].bv_val = pcookie.last;
 728                 pcookie.uuids[0].bv_len = UUID_LEN;
 729                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 730                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 731                         pcookie.uuids[i].bv_len = UUID_LEN;
 732                 }
 733                 break;
 734         }
 735
 736         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 737         fop.o_bd->be_search( &fop, &frs );
 738         fop.o_bd->bd_info = (BackendInfo *)on;
 739
 740         switch( mode ) {
 741         case FIND_MAXCSN:
 742                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 743 #ifdef CHECK_CSN
 744                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 745                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 746 #endif
 747                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 748                         si->si_numops++;        /* ensure a checkpoint */
 749                 }
 750                 break;
 751         case FIND_CSN:
 752                 /* If matching CSN was not found, invalidate the context. */
 753                 if ( !cb.sc_private ) {
 754                         /* If we didn't find an exact match, then try for <= */
 755                         if ( findcsn_retry ) {
 756                                 findcsn_retry = 0;
 757                                 rs_reinit( &frs, REP_RESULT );
 758                                 goto again;
 759                         }
 760                         rc = LDAP_NO_SUCH_OBJECT;
 761                 }
 762                 break;
 763         case FIND_PRESENT:
 764                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 765                 break;
 766         }
 767
 768         return rc;
 769 }
 770
 771 static void free_resinfo( syncres *sr )
 772 {
 773         syncres **st;
 774         int freeit = 0;
 775         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 776         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 777                 if (*st == sr) {
 778                         *st = sr->s_rilist;
 779                         break;
 780                 }
 781         }
 782         if ( !sr->s_info->ri_list )
 783                 freeit = 1;
 784         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 785         if ( freeit ) {
 786                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 787                 if ( sr->s_info->ri_e )
 788                         entry_free( sr->s_info->ri_e );
 789                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 790                         ch_free( sr->s_info->ri_cookie.bv_val );
 791                 ch_free( sr->s_info );
 792         }
 793 }
 794
 795 static int
 796 syncprov_free_syncop( syncops *so, int unlink )
 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 0;
 806         }
 807         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 808         if ( unlink ) {
 809                 syncops **sop;
 810                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 811                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 812                         if ( *sop == so ) {
 813                                 *sop = so->s_next;
 814                                 break;
 815                         }
 816                 }
 817                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 818         }
 819         if ( so->s_flags & PS_IS_DETACHED ) {
 820                 filter_free( so->s_op->ors_filter );
 821                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 822                         gnext = ga->ga_next;
 823                         ch_free( ga );
 824                 }
 825                 ch_free( so->s_op );
 826         }
 827         ch_free( so->s_base.bv_val );
 828         for ( sr=so->s_res; sr; sr=srnext ) {
 829                 srnext = sr->s_next;
 830                 free_resinfo( sr );
 831                 ch_free( sr );
 832         }
 833         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 834         ch_free( so );
 835         return 1;
 836 }
 837
 838 /* Send a persistent search response */
 839 static int
 840 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 841 {
 842         SlapReply rs = { REP_SEARCH };
 843         struct berval cookie, csns[2];
 844         Entry e_uuid = {0};
 845         Attribute a_uuid = {0};
 846
 847         if ( so->s_op->o_abandon )
 848                 return SLAPD_ABANDON;
 849
 850         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 851         rs.sr_ctrls[1] = NULL;
 852         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 853         csns[0] = ri->ri_csn;
 854         BER_BVZERO( &csns[1] );
 855         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 856
 857 #ifdef LDAP_DEBUG
 858         if ( so->s_sid > 0 ) {
 859                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 860                         so->s_sid, cookie.bv_val, 0 );
 861         } else {
 862                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 863                         cookie.bv_val, 0, 0 );
 864         }
 865 #endif
 866
 867         e_uuid.e_attrs = &a_uuid;
 868         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 869         a_uuid.a_nvals = &ri->ri_uuid;
 870         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 871                 mode, rs.sr_ctrls, 0, 1, &cookie );
 872         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 873
 874         rs.sr_entry = &e_uuid;
 875         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 876                 e_uuid = *ri->ri_e;
 877                 e_uuid.e_private = NULL;
 878         }
 879
 880         switch( mode ) {
 881         case LDAP_SYNC_ADD:
 882                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 883                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 884                         rs.sr_err = send_search_reference( op, &rs );
 885                         ber_bvarray_free( rs.sr_ref );
 886                         break;
 887                 }
 888                 /* fallthru */
 889         case LDAP_SYNC_MODIFY:
 890                 rs.sr_attrs = op->ors_attrs;
 891                 rs.sr_err = send_search_entry( op, &rs );
 892                 break;
 893         case LDAP_SYNC_DELETE:
 894                 e_uuid.e_attrs = NULL;
 895                 e_uuid.e_name = ri->ri_dn;
 896                 e_uuid.e_nname = ri->ri_ndn;
 897                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 898                         struct berval bv = BER_BVNULL;
 899                         rs.sr_ref = &bv;
 900                         rs.sr_err = send_search_reference( op, &rs );
 901                 } else {
 902                         rs.sr_err = send_search_entry( op, &rs );
 903                 }
 904                 break;
 905         default:
 906                 assert(0);
 907         }
 908         return rs.sr_err;
 909 }
 910
 911 static void
 912 syncprov_qstart( syncops *so );
 913
 914 /* Play back queued responses */
 915 static int
 916 syncprov_qplay( Operation *op, syncops *so )
 917 {
 918         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 919         syncres *sr;
 920         int rc = 0;
 921
 922         do {
 923                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 924                 sr = so->s_res;
 925                 /* Exit loop with mutex held */
 926                 if ( !sr )
 927                         break;
 928                 so->s_res = sr->s_next;
 929                 if ( !so->s_res )
 930                         so->s_restail = NULL;
 931                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 932
 933                 if ( !so->s_op->o_abandon ) {
 934
 935                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 936                                 SlapReply rs = { REP_INTERMEDIATE };
 937
 938                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 939                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 940                         } else {
 941                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 942                         }
 943                 }
 944
 945                 free_resinfo( sr );
 946                 ch_free( sr );
 947
 948                 if ( so->s_op->o_abandon )
 949                         continue;
 950
 951                 /* Exit loop with mutex held */
 952                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 953                 break;
 954
 955         } while (1);
 956
 957         /* We now only send one change at a time, to prevent one
 958          * psearch from hogging all the CPU. Resubmit this task if
 959          * there are more responses queued and no errors occurred.
 960          */
 961
 962         if ( rc == 0 && so->s_res ) {
 963                 syncprov_qstart( so );
 964         } else {
 965                 so->s_flags ^= PS_TASK_QUEUED;
 966         }
 967
 968         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 969         return rc;
 970 }
 971
 972 /* task for playing back queued responses */
 973 static void *
 974 syncprov_qtask( void *ctx, void *arg )
 975 {
 976         syncops *so = arg;
 977         OperationBuffer opbuf;
 978         Operation *op;
 979         BackendDB be;
 980         int rc;
 981
 982         op = &opbuf.ob_op;
 983         *op = *so->s_op;
 984         op->o_hdr = &opbuf.ob_hdr;
 985         op->o_controls = opbuf.ob_controls;
 986         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 987         op->o_sync = SLAP_CONTROL_IGNORED;
 988
 989         *op->o_hdr = *so->s_op->o_hdr;
 990
 991         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 992         op->o_tmpmfuncs = &slap_sl_mfuncs;
 993         op->o_threadctx = ctx;
 994
 995         /* syncprov_qplay expects a fake db */
 996         be = *so->s_op->o_bd;
 997         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 998         op->o_bd = &be;
 999         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1000         op->o_callback = NULL;
1001
1002         rc = syncprov_qplay( op, so );
1003
1004         /* decrement use count... */
1005         syncprov_free_syncop( so, 1 );
1006
1007         return NULL;
1008 }
1009
1010 /* Start the task to play back queued psearch responses */
1011 static void
1012 syncprov_qstart( syncops *so )
1013 {
1014         so->s_flags |= PS_TASK_QUEUED;
1015         so->s_inuse++;
1016         ldap_pvt_thread_pool_submit( &connection_pool,
1017                 syncprov_qtask, so );
1018 }
1019
1020 /* Queue a persistent search response */
1021 static int
1022 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1023 {
1024         syncres *sr;
1025         resinfo *ri;
1026         int srsize;
1027         struct berval csn = opc->sctxcsn;
1028
1029         sr = ch_malloc( sizeof( syncres ));
1030         sr->s_next = NULL;
1031         sr->s_mode = mode;
1032         if ( !opc->ssres.s_info ) {
1033
1034                 srsize = sizeof( resinfo );
1035                 if ( csn.bv_len )
1036                         srsize += csn.bv_len + 1;
1037
1038                 if ( opc->se ) {
1039                         Attribute *a;
1040                         ri = ch_malloc( srsize );
1041                         ri->ri_dn = opc->se->e_name;
1042                         ri->ri_ndn = opc->se->e_nname;
1043                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1044                         if ( a )
1045                                 ri->ri_uuid = a->a_nvals[0];
1046                         else
1047                                 ri->ri_uuid.bv_len = 0;
1048                         if ( csn.bv_len ) {
1049                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1050                                 ri->ri_csn.bv_len = csn.bv_len;
1051                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1052                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1053                         } else {
1054                                 ri->ri_csn.bv_val = NULL;
1055                         }
1056                 } else {
1057                         srsize += opc->suuid.bv_len +
1058                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1059                         ri = ch_malloc( srsize );
1060                         ri->ri_dn.bv_val = (char *)(ri + 1);
1061                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1062                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1063                                 opc->sdn.bv_val ) + 1;
1064                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1065                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1066                                 opc->sndn.bv_val ) + 1;
1067                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1068                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1069                         if ( csn.bv_len ) {
1070                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1071                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1072                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1073                         } else {
1074                                 ri->ri_csn.bv_val = NULL;
1075                         }
1076                 }
1077                 ri->ri_list = &opc->ssres;
1078                 ri->ri_e = opc->se;
1079                 ri->ri_csn.bv_len = csn.bv_len;
1080                 ri->ri_isref = opc->sreference;
1081                 BER_BVZERO( &ri->ri_cookie );
1082                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1083                 opc->se = NULL;
1084                 opc->ssres.s_info = ri;
1085         }
1086         ri = opc->ssres.s_info;
1087         sr->s_info = ri;
1088         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1089         sr->s_rilist = ri->ri_list;
1090         ri->ri_list = sr;
1091         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1092                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1093
1094                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1095                         so->s_rid, slap_serverID ? slap_serverID : -1);
1096         }
1097         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1098
1099         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1100         if ( !so->s_res ) {
1101                 so->s_res = sr;
1102         } else {
1103                 so->s_restail->s_next = sr;
1104         }
1105         so->s_restail = sr;
1106
1107         /* If the base of the psearch was modified, check it next time round */
1108         if ( so->s_flags & PS_WROTE_BASE ) {
1109                 so->s_flags ^= PS_WROTE_BASE;
1110                 so->s_flags |= PS_FIND_BASE;
1111         }
1112         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1113                 syncprov_qstart( so );
1114         }
1115         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1116         return LDAP_SUCCESS;
1117 }
1118
1119 static int
1120 syncprov_drop_psearch( syncops *so, int lock )
1121 {
1122         if ( so->s_flags & PS_IS_DETACHED ) {
1123                 if ( lock )
1124                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1125                 so->s_op->o_conn->c_n_ops_executing--;
1126                 so->s_op->o_conn->c_n_ops_completed++;
1127                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1128                         o_next );
1129                 if ( lock )
1130                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1131         }
1132         return syncprov_free_syncop( so, 0 );
1133 }
1134
1135 static int
1136 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1137 {
1138         slap_callback *sc = op->o_callback;
1139         op->o_callback = sc->sc_next;
1140         syncprov_drop_psearch( sc->sc_private, 0 );
1141         op->o_tmpfree( sc, op->o_tmpmemctx );
1142         return 0;
1143 }
1144
1145 static int
1146 syncprov_op_abandon( Operation *op, SlapReply *rs )
1147 {
1148         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1149         syncprov_info_t         *si = on->on_bi.bi_private;
1150         syncops *so, **sop;
1151
1152         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1153         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1154                 if ( so->s_op->o_connid == op->o_connid &&
1155                         so->s_op->o_msgid == op->orn_msgid ) {
1156                                 so->s_op->o_abandon = 1;
1157                                 *sop = so->s_next;
1158                                 break;
1159                 }
1160         }
1161         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1162         if ( so ) {
1163                 /* Is this really a Cancel exop? */
1164                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1165                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1166                         rs->sr_err = LDAP_CANCELLED;
1167                         send_ldap_result( so->s_op, rs );
1168                         if ( so->s_flags & PS_IS_DETACHED ) {
1169                                 slap_callback *cb;
1170                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1171                                 cb->sc_cleanup = syncprov_ab_cleanup;
1172                                 cb->sc_next = op->o_callback;
1173                                 cb->sc_private = so;
1174                                 op->o_callback = cb;
1175                                 return SLAP_CB_CONTINUE;
1176                         }
1177                 }
1178                 syncprov_drop_psearch( so, 0 );
1179         }
1180         return SLAP_CB_CONTINUE;
1181 }
1182
1183 /* Find which persistent searches are affected by this operation */
1184 static void
1185 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1186 {
1187         slap_overinst *on = opc->son;
1188         syncprov_info_t         *si = on->on_bi.bi_private;
1189
1190         fbase_cookie fc;
1191         syncops **pss;
1192         Entry *e = NULL;
1193         Attribute *a;
1194         int rc, gonext;
1195         struct berval newdn;
1196         int freefdn = 0;
1197         BackendDB *b0 = op->o_bd, db;
1198
1199         fc.fdn = &op->o_req_ndn;
1200         /* compute new DN */
1201         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1202                 struct berval pdn;
1203                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1204                 else dnParent( fc.fdn, &pdn );
1205                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1206                 fc.fdn = &newdn;
1207                 freefdn = 1;
1208         }
1209         if ( op->o_tag != LDAP_REQ_ADD ) {
1210                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1211                         db = *op->o_bd;
1212                         op->o_bd = &db;
1213                 }
1214                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1215                 /* If we're sending responses now, make a copy and unlock the DB */
1216                 if ( e && !saveit ) {
1217                         if ( !opc->se )
1218                                 opc->se = entry_dup( e );
1219                         overlay_entry_release_ov( op, e, 0, on );
1220                         e = opc->se;
1221                 }
1222                 if ( rc ) {
1223                         op->o_bd = b0;
1224                         return;
1225                 }
1226         } else {
1227                 e = op->ora_e;
1228                 if ( !saveit ) {
1229                         if ( !opc->se )
1230                                 opc->se = entry_dup( e );
1231                         e = opc->se;
1232                 }
1233         }
1234
1235         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1236                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1237                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1238                 opc->sreference = is_entry_referral( e );
1239                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1240                 if ( a )
1241                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1242         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1243                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1244                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1245                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1246                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1247         }
1248
1249         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1250         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1251         {
1252                 Operation op2;
1253                 Opheader oh;
1254                 syncmatches *sm;
1255                 int found = 0;
1256                 syncops *snext, *ss = *pss;
1257
1258                 gonext = 1;
1259                 if ( ss->s_op->o_abandon )
1260                         continue;
1261
1262                 /* Don't send ops back to the originator */
1263                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1264                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1265                                 opc->osid, 0, 0 );
1266                         continue;
1267                 }
1268
1269                 /* Don't send ops back to the messenger */
1270                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1271                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1272                                 opc->rsid, 0, 0 );
1273                         continue;
1274                 }
1275
1276                 /* validate base */
1277                 fc.fss = ss;
1278                 fc.fbase = 0;
1279                 fc.fscope = 0;
1280
1281                 /* If the base of the search is missing, signal a refresh */
1282                 rc = syncprov_findbase( op, &fc );
1283                 if ( rc != LDAP_SUCCESS ) {
1284                         SlapReply rs = {REP_RESULT};
1285                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1286                                 "search base has changed" );
1287                         snext = ss->s_next;
1288                         if ( syncprov_drop_psearch( ss, 1 ) )
1289                                 *pss = snext;
1290                         gonext = 0;
1291                         continue;
1292                 }
1293
1294                 /* If we're sending results now, look for this op in old matches */
1295                 if ( !saveit ) {
1296                         syncmatches *old;
1297
1298                         /* Did we modify the search base? */
1299                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1300                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1301                                 ss->s_flags |= PS_WROTE_BASE;
1302                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1303                         }
1304
1305                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1306                                 old=sm, sm=sm->sm_next ) {
1307                                 if ( sm->sm_op == ss ) {
1308                                         found = 1;
1309                                         old->sm_next = sm->sm_next;
1310                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1311                                         break;
1312                                 }
1313                         }
1314                 }
1315
1316                 if ( fc.fscope ) {
1317                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1318                         op2 = *ss->s_op;
1319                         oh = *op->o_hdr;
1320                         oh.oh_conn = ss->s_op->o_conn;
1321                         oh.oh_connid = ss->s_op->o_connid;
1322                         op2.o_bd = op->o_bd->bd_self;
1323                         op2.o_hdr = &oh;
1324                         op2.o_extra = op->o_extra;
1325                         op2.o_callback = NULL;
1326                         if (ss->s_flags & PS_FIX_FILTER) {
1327                                 /* Skip the AND/GE clause that we stuck on in front. We
1328                                    would lose deletes/mods that happen during the refresh
1329                                    phase otherwise (ITS#6555) */
1330                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1331                         }
1332                         rc = test_filter( &op2, e, op2.ors_filter );
1333                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1334                 }
1335
1336                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1337                         ss->s_sid, fc.fscope, rc );
1338
1339                 /* check if current o_req_dn is in scope and matches filter */
1340                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1341                         if ( saveit ) {
1342                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1343                                 sm->sm_next = opc->smatches;
1344                                 sm->sm_op = ss;
1345                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1346                                 ++ss->s_inuse;
1347                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1348                                 opc->smatches = sm;
1349                         } else {
1350                                 /* if found send UPDATE else send ADD */
1351                                 syncprov_qresp( opc, ss,
1352                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1353                         }
1354                 } else if ( !saveit && found ) {
1355                         /* send DELETE */
1356                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1357                 } else if ( !saveit ) {
1358                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1359                 }
1360                 if ( !saveit && found ) {
1361                         /* Decrement s_inuse, was incremented when called
1362                          * with saveit == TRUE
1363                          */
1364                         snext = ss->s_next;
1365                         if ( syncprov_free_syncop( ss, 0 ) ) {
1366                                 *pss = snext;
1367                                 gonext = 0;
1368                         }
1369                 }
1370         }
1371         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1372
1373         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1374                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1375                         op->o_bd = &db;
1376                 }
1377                 if ( saveit )
1378                         overlay_entry_release_ov( op, e, 0, on );
1379                 op->o_bd = b0;
1380         }
1381         if ( !saveit ) {
1382                 if ( opc->ssres.s_info )
1383                         free_resinfo( &opc->ssres );
1384                 else if ( opc->se )
1385                         entry_free( opc->se );
1386         }
1387         if ( freefdn ) {
1388                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1389         }
1390         op->o_bd = b0;
1391 }
1392
1393 static int
1394 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1395 {
1396         slap_callback *cb = op->o_callback;
1397         opcookie *opc = cb->sc_private;
1398         slap_overinst *on = opc->son;
1399         syncprov_info_t         *si = on->on_bi.bi_private;
1400         syncmatches *sm, *snext;
1401         modtarget *mt;
1402
1403         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1404         if ( si->si_active )
1405                 si->si_active--;
1406         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1407
1408         for (sm = opc->smatches; sm; sm=snext) {
1409                 snext = sm->sm_next;
1410                 syncprov_free_syncop( sm->sm_op, 1 );
1411                 op->o_tmpfree( sm, op->o_tmpmemctx );
1412         }
1413
1414         /* Remove op from lock table */
1415         mt = opc->smt;
1416         if ( mt ) {
1417                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1418                 mt->mt_mods = mt->mt_mods->mi_next;
1419                 /* If there are more, promote the next one */
1420                 if ( mt->mt_mods ) {
1421                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1422                 } else {
1423                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1424                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1425                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1426                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1427                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1428                         ch_free( mt->mt_dn.bv_val );
1429                         ch_free( mt );
1430                 }
1431         }
1432         if ( !BER_BVISNULL( &opc->suuid ))
1433                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1434         if ( !BER_BVISNULL( &opc->sndn ))
1435                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1436         if ( !BER_BVISNULL( &opc->sdn ))
1437                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1438         op->o_callback = cb->sc_next;
1439         op->o_tmpfree(cb, op->o_tmpmemctx);
1440
1441         return 0;
1442 }
1443
1444 static void
1445 syncprov_checkpoint( Operation *op, slap_overinst *on )
1446 {
1447         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1448         Modifications mod;
1449         Operation opm;
1450         SlapReply rsm = {REP_RESULT};
1451         slap_callback cb = {0};
1452         BackendDB be;
1453         BackendInfo *bi;
1454
1455 #ifdef CHECK_CSN
1456         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1457
1458         int i;
1459         for ( i=0; i<si->si_numcsns; i++ ) {
1460                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1461         }
1462 #endif
1463         mod.sml_numvals = si->si_numcsns;
1464         mod.sml_values = si->si_ctxcsn;
1465         mod.sml_nvalues = NULL;
1466         mod.sml_desc = slap_schema.si_ad_contextCSN;
1467         mod.sml_op = LDAP_MOD_REPLACE;
1468         mod.sml_flags = SLAP_MOD_INTERNAL;
1469         mod.sml_next = NULL;
1470
1471         cb.sc_response = slap_null_cb;
1472         opm = *op;
1473         opm.o_tag = LDAP_REQ_MODIFY;
1474         opm.o_callback = &cb;
1475         opm.orm_modlist = &mod;
1476         opm.orm_no_opattrs = 1;
1477         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1478                 be = *on->on_info->oi_origdb;
1479                 opm.o_bd = &be;
1480         }
1481         opm.o_req_dn = si->si_contextdn;
1482         opm.o_req_ndn = si->si_contextdn;
1483         bi = opm.o_bd->bd_info;
1484         opm.o_bd->bd_info = on->on_info->oi_orig;
1485         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1486         opm.o_no_schema_check = 1;
1487         opm.o_bd->be_modify( &opm, &rsm );
1488
1489         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1490                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1491                 const char      *text;
1492                 char txtbuf[SLAP_TEXT_BUFLEN];
1493                 size_t textlen = sizeof txtbuf;
1494                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1495                 rs_reinit( &rsm, REP_RESULT );
1496                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1497                 opm.ora_e = e;
1498                 opm.o_bd->be_add( &opm, &rsm );
1499                 if ( e == opm.ora_e )
1500                         be_entry_release_w( &opm, opm.ora_e );
1501         }
1502         opm.o_bd->bd_info = bi;
1503
1504         if ( mod.sml_next != NULL ) {
1505                 slap_mods_free( mod.sml_next, 1 );
1506         }
1507 #ifdef CHECK_CSN
1508         for ( i=0; i<si->si_numcsns; i++ ) {
1509                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1510         }
1511 #endif
1512 }
1513
1514 static void
1515 syncprov_add_slog( Operation *op )
1516 {
1517         opcookie *opc = op->o_callback->sc_private;
1518         slap_overinst *on = opc->son;
1519         syncprov_info_t         *si = on->on_bi.bi_private;
1520         sessionlog *sl;
1521         slog_entry *se;
1522
1523         sl = si->si_logs;
1524         {
1525                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1526                         /* During the syncrepl refresh phase we can receive operations
1527                          * without a csn.  We cannot reliably determine the consumers
1528                          * state with respect to such operations, so we ignore them and
1529                          * wipe out anything in the log if we see them.
1530                          */
1531                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1532                         while ( se = sl->sl_head ) {
1533                                 sl->sl_head = se->se_next;
1534                                 ch_free( se );
1535                         }
1536                         sl->sl_tail = NULL;
1537                         sl->sl_num = 0;
1538                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1539                         return;
1540                 }
1541
1542                 /* Allocate a record. UUIDs are not NUL-terminated. */
1543                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1544                         op->o_csn.bv_len + 1 );
1545                 se->se_next = NULL;
1546                 se->se_tag = op->o_tag;
1547
1548                 se->se_uuid.bv_val = (char *)(&se[1]);
1549                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1550                 se->se_uuid.bv_len = opc->suuid.bv_len;
1551
1552                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1553                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1554                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1555                 se->se_csn.bv_len = op->o_csn.bv_len;
1556                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1557
1558                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1559                 if ( sl->sl_head ) {
1560                         /* Keep the list in csn order. */
1561                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1562                                 sl->sl_tail->se_next = se;
1563                                 sl->sl_tail = se;
1564                         } else {
1565                                 slog_entry **sep;
1566
1567                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1568                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1569                                                 se->se_next = *sep;
1570                                                 *sep = se;
1571                                                 break;
1572                                         }
1573                                 }
1574                         }
1575                 } else {
1576                         sl->sl_head = se;
1577                         sl->sl_tail = se;
1578                         if ( !sl->sl_mincsn ) {
1579                                 sl->sl_numcsns = 1;
1580                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1581                                 sl->sl_sids = ch_malloc( sizeof( int ));
1582                                 sl->sl_sids[0] = se->se_sid;
1583                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1584                                 BER_BVZERO( &sl->sl_mincsn[1] );
1585                         }
1586                 }
1587                 sl->sl_num++;
1588                 while ( sl->sl_num > sl->sl_size ) {
1589                         int i, j;
1590                         se = sl->sl_head;
1591                         sl->sl_head = se->se_next;
1592                         for ( i=0; i<sl->sl_numcsns; i++ )
1593                                 if ( sl->sl_sids[i] >= se->se_sid )
1594                                         break;
1595                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1596                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1597                                         i, se->se_sid, &se->se_csn );
1598                         } else {
1599                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1600                         }
1601                         ch_free( se );
1602                         sl->sl_num--;
1603                 }
1604                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1605         }
1606 }
1607
1608 /* Just set a flag if we found the matching entry */
1609 static int
1610 playlog_cb( Operation *op, SlapReply *rs )
1611 {
1612         if ( rs->sr_type == REP_SEARCH ) {
1613                 op->o_callback->sc_private = (void *)1;
1614         }
1615         return rs->sr_err;
1616 }
1617
1618 /* enter with sl->sl_mutex locked, release before returning */
1619 static void
1620 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1621         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1622 {
1623         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1624         slog_entry *se;
1625         int i, j, ndel, num, nmods, mmods;
1626         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1627         BerVarray uuids;
1628         struct berval delcsn[2];
1629
1630         if ( !sl->sl_num ) {
1631                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1632                 return;
1633         }
1634
1635         num = sl->sl_num;
1636         i = 0;
1637         nmods = 0;
1638
1639         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1640                 num * UUID_LEN, op->o_tmpmemctx );
1641         uuids[0].bv_val = (char *)(uuids + num + 1);
1642
1643         delcsn[0].bv_len = 0;
1644         delcsn[0].bv_val = cbuf;
1645         BER_BVZERO(&delcsn[1]);
1646
1647         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1648          * and everything else at the end. Do this first so we can
1649          * unlock the list mutex.
1650          */
1651         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1652                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1653         for ( se=sl->sl_head; se; se=se->se_next ) {
1654                 int k;
1655                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1656                 ndel = 1;
1657                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1658                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1659                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1660                                 break;
1661                         }
1662                 }
1663                 if ( ndel <= 0 ) {
1664                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1665                         continue;
1666                 }
1667                 ndel = 0;
1668                 for ( k=0; k<numcsns; k++ ) {
1669                         if ( se->se_sid == sids[k] ) {
1670                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1671                                 break;
1672                         }
1673                 }
1674                 if ( ndel > 0 ) {
1675                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1676                         break;
1677                 }
1678                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1679                         j = i;
1680                         i++;
1681                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1682                         delcsn[0].bv_len = se->se_csn.bv_len;
1683                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1684                 } else {
1685                         if ( se->se_tag == LDAP_REQ_ADD )
1686                                 continue;
1687                         nmods++;
1688                         j = num - nmods;
1689                 }
1690                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1691                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1692                 uuids[j].bv_len = UUID_LEN;
1693         }
1694         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1695
1696         ndel = i;
1697
1698         /* Zero out unused slots */
1699         for ( i=ndel; i < num - nmods; i++ )
1700                 uuids[i].bv_len = 0;
1701
1702         /* Mods must be validated to see if they belong in this delete set.
1703          */
1704
1705         mmods = nmods;
1706         /* Strip any duplicates */
1707         for ( i=0; i<nmods; i++ ) {
1708                 for ( j=0; j<ndel; j++ ) {
1709                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1710                                 uuids[num - 1 - i].bv_len = 0;
1711                                 mmods --;
1712                                 break;
1713                         }
1714                 }
1715                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1716                 for ( j=0; j<i; j++ ) {
1717                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1718                                 uuids[num - 1 - i].bv_len = 0;
1719                                 mmods --;
1720                                 break;
1721                         }
1722                 }
1723         }
1724
1725         if ( mmods ) {
1726                 Operation fop;
1727                 int rc;
1728                 Filter mf, af;
1729                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1730                 slap_callback cb = {0};
1731
1732                 fop = *op;
1733
1734                 fop.o_sync_mode = 0;
1735                 fop.o_callback = &cb;
1736                 fop.ors_limit = NULL;
1737                 fop.ors_tlimit = SLAP_NO_LIMIT;
1738                 fop.ors_attrs = slap_anlist_all_attributes;
1739                 fop.ors_attrsonly = 0;
1740                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1741
1742                 af.f_choice = LDAP_FILTER_AND;
1743                 af.f_next = NULL;
1744                 af.f_and = &mf;
1745                 mf.f_choice = LDAP_FILTER_EQUALITY;
1746                 mf.f_ava = &eq;
1747                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1748                 mf.f_next = fop.ors_filter;
1749
1750                 fop.ors_filter = &af;
1751
1752                 cb.sc_response = playlog_cb;
1753                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1754
1755                 for ( i=ndel; i<num; i++ ) {
1756                   if ( uuids[i].bv_len != 0 ) {
1757                         SlapReply frs = { REP_RESULT };
1758
1759                         mf.f_av_value = uuids[i];
1760                         cb.sc_private = NULL;
1761                         fop.ors_slimit = 1;
1762                         rc = fop.o_bd->be_search( &fop, &frs );
1763
1764                         /* If entry was not found, add to delete list */
1765                         if ( !cb.sc_private ) {
1766                                 uuids[ndel++] = uuids[i];
1767                         }
1768                   }
1769                 }
1770                 fop.o_bd->bd_info = (BackendInfo *)on;
1771         }
1772         if ( ndel ) {
1773                 struct berval cookie;
1774
1775                 if ( delcsn[0].bv_len ) {
1776                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1777                                 slap_serverID ? slap_serverID : -1 );
1778
1779                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1780                 }
1781
1782                 uuids[ndel].bv_val = NULL;
1783                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1784                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1785                 if ( delcsn[0].bv_len ) {
1786                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1787                 }
1788         }
1789         op->o_tmpfree( uuids, op->o_tmpmemctx );
1790 }
1791
1792 static int
1793 syncprov_op_response( Operation *op, SlapReply *rs )
1794 {
1795         opcookie *opc = op->o_callback->sc_private;
1796         slap_overinst *on = opc->son;
1797         syncprov_info_t         *si = on->on_bi.bi_private;
1798         syncmatches *sm;
1799
1800         if ( rs->sr_err == LDAP_SUCCESS )
1801         {
1802                 struct berval maxcsn;
1803                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1804                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1805
1806                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1807
1808                 /* Update our context CSN */
1809                 cbuf[0] = '\0';
1810                 maxcsn.bv_val = cbuf;
1811                 maxcsn.bv_len = sizeof(cbuf);
1812                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1813
1814                 slap_get_commit_csn( op, &maxcsn, &foundit );
1815                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1816                         /* syncrepl queues the CSN values in the db where
1817                          * it is configured , not where the changes are made.
1818                          * So look for a value in the glue db if we didn't
1819                          * find any in this db.
1820                          */
1821                         BackendDB *be = op->o_bd;
1822                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1823                         maxcsn.bv_val = cbuf;
1824                         maxcsn.bv_len = sizeof(cbuf);
1825                         slap_get_commit_csn( op, &maxcsn, &foundit );
1826                         op->o_bd = be;
1827                 }
1828                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1829                         int i, sid;
1830 #ifdef CHECK_CSN
1831                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1832                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1833 #endif
1834                         sid = slap_parse_csn_sid( &maxcsn );
1835                         for ( i=0; i<si->si_numcsns; i++ ) {
1836                                 if ( sid < si->si_sids[i] )
1837                                         break;
1838                                 if ( sid == si->si_sids[i] ) {
1839                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1840                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1841                                                 csn_changed = 1;
1842                                         }
1843                                         break;
1844                                 }
1845                         }
1846                         /* It's a new SID for us */
1847                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1848                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1849                                         i, sid, &maxcsn );
1850                                 csn_changed = 1;
1851                         }
1852                 }
1853
1854                 /* Don't do any processing for consumer contextCSN updates */
1855                 if ( op->o_dont_replicate ) {
1856                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1857                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1858                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1859                         /* Catch contextCSN updates from syncrepl. We have to look at
1860                          * all the attribute values, as there may be more than one csn
1861                          * that changed, and only one can be passed in the csn queue.
1862                          */
1863                         Modifications *mod = op->orm_modlist;
1864                         unsigned i;
1865                         int j, sid;
1866
1867                         for ( i=0; i<mod->sml_numvals; i++ ) {
1868                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1869                                 for ( j=0; j<si->si_numcsns; j++ ) {
1870                                         if ( sid < si->si_sids[j] )
1871                                                 break;
1872                                         if ( sid == si->si_sids[j] ) {
1873                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1874                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1875                                                         csn_changed = 1;
1876                                                 }
1877                                                 break;
1878                                         }
1879                                 }
1880
1881                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1882                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1883                                                 j, sid, &mod->sml_values[i] );
1884                                         csn_changed = 1;
1885                                 }
1886                         }
1887                         if ( csn_changed )
1888                                 si->si_dirty = 0;
1889                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1890
1891                         if ( csn_changed ) {
1892                                 syncops *ss;
1893                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1894                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1895                                         if ( ss->s_op->o_abandon )
1896                                                 continue;
1897                                         /* Send the updated csn to all syncrepl consumers,
1898                                          * including the server from which it originated.
1899                                          * The syncrepl consumer and syncprov provider on
1900                                          * the originating server may be configured to store
1901                                          * their csn values in different entries.
1902                                          */
1903                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1904                                 }
1905                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1906                         }
1907                         } else {
1908                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1909                         }
1910                         goto leave;
1911                 }
1912
1913                 si->si_numops++;
1914                 if ( si->si_chkops || si->si_chktime ) {
1915                         /* Never checkpoint adding the context entry,
1916                          * it will deadlock
1917                          */
1918                         if ( op->o_tag != LDAP_REQ_ADD ||
1919                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1920                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1921                                         do_check = 1;
1922                                         si->si_numops = 0;
1923                                 }
1924                                 if ( si->si_chktime &&
1925                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1926                                         if ( si->si_chklast ) {
1927                                                 do_check = 1;
1928                                                 si->si_chklast = op->o_time;
1929                                         } else {
1930                                                 si->si_chklast = 1;
1931                                         }
1932                                 }
1933                         }
1934                 }
1935                 si->si_dirty = !csn_changed;
1936                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1937
1938                 if ( do_check ) {
1939                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1940                         syncprov_checkpoint( op, on );
1941                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1942                 }
1943
1944                 /* only update consumer ctx if this is a newer csn */
1945                 if ( csn_changed ) {
1946                         opc->sctxcsn = maxcsn;
1947                 }
1948
1949                 /* Handle any persistent searches */
1950                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1951                 have_psearches = ( si->si_ops != NULL );
1952                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1953                 if ( have_psearches ) {
1954                         switch(op->o_tag) {
1955                         case LDAP_REQ_ADD:
1956                         case LDAP_REQ_MODIFY:
1957                         case LDAP_REQ_MODRDN:
1958                         case LDAP_REQ_EXTENDED:
1959                                 syncprov_matchops( op, opc, 0 );
1960                                 break;
1961                         case LDAP_REQ_DELETE:
1962                                 /* for each match in opc->smatches:
1963                                  *   send DELETE msg
1964                                  */
1965                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1966                                         if ( sm->sm_op->s_op->o_abandon )
1967                                                 continue;
1968                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1969                                 }
1970                                 break;
1971                         }
1972                 }
1973
1974                 /* Add any log records */
1975                 if ( si->si_logs ) {
1976                         syncprov_add_slog( op );
1977                 }
1978 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1979         }
1980         return SLAP_CB_CONTINUE;
1981 }
1982
1983 /* We don't use a subentry to store the context CSN any more.
1984  * We expose the current context CSN as an operational attribute
1985  * of the suffix entry.
1986  */
1987 static int
1988 syncprov_op_compare( Operation *op, SlapReply *rs )
1989 {
1990         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1991         syncprov_info_t         *si = on->on_bi.bi_private;
1992         int rc = SLAP_CB_CONTINUE;
1993
1994         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1995                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1996         {
1997                 Entry e = {0};
1998                 Attribute a = {0};
1999
2000                 e.e_name = si->si_contextdn;
2001                 e.e_nname = si->si_contextdn;
2002                 e.e_attrs = &a;
2003
2004                 a.a_desc = slap_schema.si_ad_contextCSN;
2005
2006                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2007
2008                 a.a_vals = si->si_ctxcsn;
2009                 a.a_nvals = a.a_vals;
2010                 a.a_numvals = si->si_numcsns;
2011
2012                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2013                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2014                 if ( ! rs->sr_err ) {
2015                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2016                         goto return_results;
2017                 }
2018
2019                 if ( get_assert( op ) &&
2020                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2021                 {
2022                         rs->sr_err = LDAP_ASSERTION_FAILED;
2023                         goto return_results;
2024                 }
2025
2026
2027                 rs->sr_err = LDAP_COMPARE_FALSE;
2028
2029                 if ( attr_valfind( &a,
2030                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2031                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2032                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2033                 {
2034                         rs->sr_err = LDAP_COMPARE_TRUE;
2035                 }
2036
2037 return_results:;
2038
2039                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2040
2041                 send_ldap_result( op, rs );
2042
2043                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2044                         rs->sr_err = LDAP_SUCCESS;
2045                 }
2046                 rc = rs->sr_err;
2047         }
2048
2049         return rc;
2050 }
2051
2052 static int
2053 syncprov_op_mod( Operation *op, SlapReply *rs )
2054 {
2055         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2056         syncprov_info_t         *si = on->on_bi.bi_private;
2057         slap_callback *cb;
2058         opcookie *opc;
2059         int have_psearches, cbsize;
2060
2061         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2062         have_psearches = ( si->si_ops != NULL );
2063         si->si_active++;
2064         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2065
2066         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2067                 (have_psearches ? sizeof(modinst) : 0 );
2068
2069         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2070         opc = (opcookie *)(cb+1);
2071         opc->son = on;
2072         cb->sc_response = syncprov_op_response;
2073         cb->sc_cleanup = syncprov_op_cleanup;
2074         cb->sc_private = opc;
2075         cb->sc_next = op->o_callback;
2076         op->o_callback = cb;
2077
2078         opc->osid = -1;
2079         opc->rsid = -1;
2080         if ( op->o_csn.bv_val ) {
2081                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2082         }
2083         if ( op->o_controls ) {
2084                 struct sync_cookie *scook =
2085                 op->o_controls[slap_cids.sc_LDAPsync];
2086                 if ( scook )
2087                         opc->rsid = scook->sid;
2088         }
2089
2090         if ( op->o_dont_replicate )
2091                 return SLAP_CB_CONTINUE;
2092
2093         /* If there are active persistent searches, lock this operation.
2094          * See seqmod.c for the locking logic on its own.
2095          */
2096         if ( have_psearches ) {
2097                 modtarget *mt, mtdummy;
2098                 modinst *mi;
2099
2100                 mi = (modinst *)(opc+1);
2101                 mi->mi_op = op;
2102
2103                 /* See if we're already modifying this entry... */
2104                 mtdummy.mt_dn = op->o_req_ndn;
2105                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2106                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2107                 if ( mt ) {
2108                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2109                         if ( mt->mt_mods == NULL ) {
2110                                 /* Cannot reuse this mt, as another thread is about
2111                                  * to release it in syncprov_op_cleanup.
2112                                  */
2113                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2114                                 mt = NULL;
2115                         }
2116                 }
2117                 if ( mt ) {
2118                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2119                         mt->mt_tail->mi_next = mi;
2120                         mt->mt_tail = mi;
2121                         /* wait for this op to get to head of list */
2122                         while ( mt->mt_mods != mi ) {
2123                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2124                                 /* FIXME: if dynamic config can delete overlays or
2125                                  * databases we'll have to check for cleanup here.
2126                                  * Currently it's not an issue because there are
2127                                  * no dynamic config deletes...
2128                                  */
2129                                 if ( slapd_shutdown )
2130                                         return SLAPD_ABANDON;
2131
2132                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2133                                         ldap_pvt_thread_yield();
2134                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2135
2136                                 /* clean up if the caller is giving up */
2137                                 if ( op->o_abandon ) {
2138                                         modinst *m2;
2139                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2140                                                 m2 = m2->mi_next );
2141                                         if ( m2 ) {
2142                                                 m2->mi_next = mi->mi_next;
2143                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2144                                         }
2145                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2146                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2147                                         return SLAPD_ABANDON;
2148                                 }
2149                         }
2150                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2151                 } else {
2152                         /* Record that we're modifying this entry now */
2153                         mt = ch_malloc( sizeof(modtarget) );
2154                         mt->mt_mods = mi;
2155                         mt->mt_tail = mi;
2156                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2157                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2158                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2159                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2160                 }
2161                 opc->smt = mt;
2162         }
2163
2164         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2165                 syncprov_matchops( op, opc, 1 );
2166
2167         return SLAP_CB_CONTINUE;
2168 }
2169
2170 static int
2171 syncprov_op_extended( Operation *op, SlapReply *rs )
2172 {
2173         if ( exop_is_write( op ))
2174                 return syncprov_op_mod( op, rs );
2175
2176         return SLAP_CB_CONTINUE;
2177 }
2178
2179 typedef struct searchstate {
2180         slap_overinst *ss_on;
2181         syncops *ss_so;
2182         BerVarray ss_ctxcsn;
2183         int *ss_sids;
2184         int ss_numcsns;
2185 #define SS_PRESENT      0x01
2186 #define SS_CHANGED      0x02
2187         int ss_flags;
2188 } searchstate;
2189
2190 typedef struct SyncOperationBuffer {
2191         Operation               sob_op;
2192         Opheader                sob_hdr;
2193         OpExtra                 sob_oe;
2194         AttributeName   sob_extra;      /* not always present */
2195         /* Further data allocated here */
2196 } SyncOperationBuffer;
2197
2198 static void
2199 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2200 {
2201         SyncOperationBuffer *sopbuf2;
2202         Operation *op2;
2203         int i, alen = 0;
2204         size_t size;
2205         char *ptr;
2206         GroupAssertion *g1, *g2;
2207
2208         /* count the search attrs */
2209         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2210                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2211         }
2212         /* Make a new copy of the operation */
2213         size = offsetof( SyncOperationBuffer, sob_extra ) +
2214                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2215                 op->o_req_dn.bv_len + 1 +
2216                 op->o_req_ndn.bv_len + 1 +
2217                 op->o_ndn.bv_len + 1 +
2218                 so->s_filterstr.bv_len + 1;
2219         sopbuf2 = ch_calloc( 1, size );
2220         op2 = &sopbuf2->sob_op;
2221         op2->o_hdr = &sopbuf2->sob_hdr;
2222         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2223
2224         /* Copy the fields we care about explicitly, leave the rest alone */
2225         *op2->o_hdr = *op->o_hdr;
2226         op2->o_tag = op->o_tag;
2227         op2->o_time = op->o_time;
2228         op2->o_bd = on->on_info->oi_origdb;
2229         op2->o_request = op->o_request;
2230         op2->o_managedsait = op->o_managedsait;
2231         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2232         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2233
2234         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2235         if ( i ) {
2236                 op2->ors_attrs = (AttributeName *) ptr;
2237                 ptr = (char *) &op2->ors_attrs[i+1];
2238                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2239                         op2->ors_attrs[i] = op->ors_attrs[i];
2240                         op2->ors_attrs[i].an_name.bv_val = ptr;
2241                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2242                 }
2243                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2244         }
2245
2246         op2->o_authz = op->o_authz;
2247         op2->o_ndn.bv_val = ptr;
2248         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2249         op2->o_dn = op2->o_ndn;
2250         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2251         op2->o_req_dn.bv_val = ptr;
2252         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2253         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2254         op2->o_req_ndn.bv_val = ptr;
2255         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2256         op2->ors_filterstr.bv_val = ptr;
2257         strcpy( ptr, so->s_filterstr.bv_val );
2258         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2259
2260         /* Skip the AND/GE clause that we stuck on in front */
2261         if ( so->s_flags & PS_FIX_FILTER ) {
2262                 op2->ors_filter = op->ors_filter->f_and->f_next;
2263                 so->s_flags ^= PS_FIX_FILTER;
2264         } else {
2265                 op2->ors_filter = op->ors_filter;
2266         }
2267         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2268         so->s_op = op2;
2269
2270         /* Copy any cached group ACLs individually */
2271         op2->o_groups = NULL;
2272         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2273                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2274                 *g2 = *g1;
2275                 strcpy( g2->ga_ndn, g1->ga_ndn );
2276                 g2->ga_next = op2->o_groups;
2277                 op2->o_groups = g2;
2278         }
2279         /* Don't allow any further group caching */
2280         op2->o_do_not_cache = 1;
2281
2282         /* Add op2 to conn so abandon will find us */
2283         op->o_conn->c_n_ops_executing++;
2284         op->o_conn->c_n_ops_completed--;
2285         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2286         so->s_flags |= PS_IS_DETACHED;
2287
2288         /* Prevent anyone else from trying to send a result for this op */
2289         op->o_abandon = 1;
2290 }
2291
2292 static int
2293 syncprov_search_response( Operation *op, SlapReply *rs )
2294 {
2295         searchstate *ss = op->o_callback->sc_private;
2296         slap_overinst *on = ss->ss_on;
2297         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2298         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2299
2300         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2301                 Attribute *a;
2302                 /* If we got a referral without a referral object, there's
2303                  * something missing that we cannot replicate. Just ignore it.
2304                  * The consumer will abort because we didn't send the expected
2305                  * control.
2306                  */
2307                 if ( !rs->sr_entry ) {
2308                         assert( rs->sr_entry != NULL );
2309                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2310                         return SLAP_CB_CONTINUE;
2311                 }
2312                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2313                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2314                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2315                 }
2316                 if ( a ) {
2317                         int i, sid;
2318                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2319
2320                         /* Don't send changed entries back to the originator */
2321                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2322                                 Debug( LDAP_DEBUG_SYNC,
2323                                         "Entry %s changed by peer, ignored\n",
2324                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2325                                 return LDAP_SUCCESS;
2326                         }
2327
2328                         /* If not a persistent search */
2329                         if ( !ss->ss_so ) {
2330                                 /* Make sure entry is less than the snapshot'd contextCSN */
2331                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2332                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2333                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2334                                                 Debug( LDAP_DEBUG_SYNC,
2335                                                         "Entry %s CSN %s greater than snapshot %s\n",
2336                                                         rs->sr_entry->e_name.bv_val,
2337                                                         a->a_nvals[0].bv_val,
2338                                                         ss->ss_ctxcsn[i].bv_val );
2339                                                 return LDAP_SUCCESS;
2340                                         }
2341                                 }
2342                         }
2343
2344                         /* Don't send old entries twice */
2345                         if ( srs->sr_state.ctxcsn ) {
2346                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2347                                         if ( sid == srs->sr_state.sids[i] &&
2348                                                 ber_bvcmp( &a->a_nvals[0],
2349                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2350                                                 Debug( LDAP_DEBUG_SYNC,
2351                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2352                                                         rs->sr_entry->e_name.bv_val,
2353                                                         a->a_nvals[0].bv_val,
2354                                                         srs->sr_state.ctxcsn[i].bv_val );
2355                                                 return LDAP_SUCCESS;
2356                                         }
2357                                 }
2358                         }
2359                 }
2360                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2361                         op->o_tmpmemctx );
2362                 rs->sr_ctrls[1] = NULL;
2363                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2364                 /* If we're in delta-sync mode, always send a cookie */
2365                 if ( si->si_nopres && si->si_usehint && a ) {
2366                         struct berval cookie;
2367                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2368                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2369                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2370                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2371                 } else {
2372                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2373                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2374                 }
2375         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2376                 struct berval cookie = BER_BVNULL;
2377
2378                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2379                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2380                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2381                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2382
2383                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2384                 }
2385
2386                 /* Is this a regular refresh?
2387                  * Note: refresh never gets here if there were no changes
2388                  */
2389                 if ( !ss->ss_so ) {
2390                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2391                                 op->o_tmpmemctx );
2392                         rs->sr_ctrls[1] = NULL;
2393                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2394                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2395                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2396                                         LDAP_SYNC_REFRESH_DELETES );
2397                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2398                 } else {
2399                 /* It's RefreshAndPersist, transition to Persist phase */
2400                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2401                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2402                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2403                                 1, NULL, 0 );
2404                         if ( !BER_BVISNULL( &cookie ))
2405                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2406
2407                         /* Detach this Op from frontend control */
2408                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2409
2410                         /* But not if this connection was closed along the way */
2411                         if ( op->o_abandon ) {
2412                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2413                                 /* syncprov_ab_cleanup will free this syncop */
2414                                 return SLAPD_ABANDON;
2415
2416                         } else {
2417                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2418                                 /* Turn off the refreshing flag */
2419                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2420
2421                                 syncprov_detach_op( op, ss->ss_so, on );
2422
2423                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2424
2425                                 /* If there are queued responses, fire them off */
2426                                 if ( ss->ss_so->s_res )
2427                                         syncprov_qstart( ss->ss_so );
2428                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2429                         }
2430
2431                         return LDAP_SUCCESS;
2432                 }
2433         }
2434
2435         return SLAP_CB_CONTINUE;
2436 }
2437
2438 static int
2439 syncprov_op_search( Operation *op, SlapReply *rs )
2440 {
2441         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2442         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2443         slap_callback   *cb;
2444         int gotstate = 0, changed = 0, do_present = 0;
2445         syncops *sop = NULL;
2446         searchstate *ss;
2447         sync_control *srs;
2448         BerVarray ctxcsn;
2449         int i, *sids, numcsns;
2450         struct berval mincsn, maxcsn;
2451         int minsid, maxsid;
2452         int dirty = 0;
2453
2454         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2455
2456         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2457                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2458                 return rs->sr_err;
2459         }
2460
2461         srs = op->o_controls[slap_cids.sc_LDAPsync];
2462
2463         /* If this is a persistent search, set it up right away */
2464         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2465                 syncops so = {0};
2466                 fbase_cookie fc;
2467                 opcookie opc;
2468                 slap_callback sc;
2469
2470                 fc.fss = &so;
2471                 fc.fbase = 0;
2472                 so.s_eid = NOID;
2473                 so.s_op = op;
2474                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2475                 /* syncprov_findbase expects to be called as a callback... */
2476                 sc.sc_private = &opc;
2477                 opc.son = on;
2478                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2479                 cb = op->o_callback;
2480                 op->o_callback = &sc;
2481                 rs->sr_err = syncprov_findbase( op, &fc );
2482                 op->o_callback = cb;
2483                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2484
2485                 if ( rs->sr_err != LDAP_SUCCESS ) {
2486                         send_ldap_result( op, rs );
2487                         return rs->sr_err;
2488                 }
2489                 sop = ch_malloc( sizeof( syncops ));
2490                 *sop = so;
2491                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2492                 sop->s_rid = srs->sr_state.rid;
2493                 sop->s_sid = srs->sr_state.sid;
2494                 /* set refcount=2 to prevent being freed out from under us
2495                  * by abandons that occur while we're running here
2496                  */
2497                 sop->s_inuse = 2;
2498
2499                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2500                 while ( si->si_active ) {
2501                         /* Wait for active mods to finish before proceeding, as they
2502                          * may already have inspected the si_ops list looking for
2503                          * consumers to replicate the change to.  Using the log
2504                          * doesn't help, as we may finish playing it before the
2505                          * active mods gets added to it.
2506                          */
2507                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2508                         if ( slapd_shutdown ) {
2509                                 ch_free( sop );
2510                                 return SLAPD_ABANDON;
2511                         }
2512                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2513                                 ldap_pvt_thread_yield();
2514                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2515                 }
2516                 sop->s_next = si->si_ops;
2517                 sop->s_si = si;
2518                 si->si_ops = sop;
2519                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2520         }
2521
2522         /* snapshot the ctxcsn */
2523         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2524         numcsns = si->si_numcsns;
2525         if ( numcsns ) {
2526                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2527                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2528                 for ( i=0; i<numcsns; i++ )
2529                         sids[i] = si->si_sids[i];
2530         } else {
2531                 ctxcsn = NULL;
2532                 sids = NULL;
2533         }
2534         dirty = si->si_dirty;
2535         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2536
2537         /* If we have a cookie, handle the PRESENT lookups */
2538         if ( srs->sr_state.ctxcsn ) {
2539                 sessionlog *sl;
2540                 int i, j;
2541
2542                 /* If we don't have any CSN of our own yet, pretend nothing
2543                  * has changed.
2544                  */
2545                 if ( !numcsns )
2546                         goto no_change;
2547
2548                 if ( !si->si_nopres )
2549                         do_present = SS_PRESENT;
2550
2551                 /* If there are SIDs we don't recognize in the cookie, drop them */
2552                 for (i=0; i<srs->sr_state.numcsns; ) {
2553                         for (j=i; j<numcsns; j++) {
2554                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2555                                         break;
2556                                 }
2557                         }
2558                         /* not found */
2559                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2560                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2561                                 srs->sr_state.numcsns--;
2562                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2563                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2564                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2565                                 }
2566                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2567                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2568                                 continue;
2569                         }
2570                         i++;
2571                 }
2572
2573                 if (srs->sr_state.numcsns != numcsns) {
2574                         /* consumer doesn't have the right number of CSNs */
2575                         changed = SS_CHANGED;
2576                         if ( srs->sr_state.ctxcsn ) {
2577                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2578                                 srs->sr_state.ctxcsn = NULL;
2579                         }
2580                         if ( srs->sr_state.sids ) {
2581                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2582                                 srs->sr_state.sids = NULL;
2583                         }
2584                         srs->sr_state.numcsns = 0;
2585                         goto shortcut;
2586                 }
2587
2588                 /* Find the smallest CSN which differs from contextCSN */
2589                 mincsn.bv_len = 0;
2590                 maxcsn.bv_len = 0;
2591                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2592                         int newer;
2593                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2594                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2595                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2596                                 maxcsn = srs->sr_state.ctxcsn[i];
2597                                 maxsid = sids[j];
2598                         }
2599                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2600                         /* If our state is newer, tell consumer about changes */
2601                         if ( newer < 0) {
2602                                 changed = SS_CHANGED;
2603                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2604                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2605                                         mincsn = srs->sr_state.ctxcsn[i];
2606                                         minsid = sids[j];
2607                                 }
2608                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2609                         /* our state is older, complain to consumer */
2610                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2611                                 rs->sr_text = "consumer state is newer than provider!";
2612 bailout:
2613                                 if ( sop ) {
2614                                         syncops **sp = &si->si_ops;
2615
2616                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2617                                         while ( *sp != sop )
2618                                                 sp = &(*sp)->s_next;
2619                                         *sp = sop->s_next;
2620                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2621                                         ch_free( sop );
2622                                 }
2623                                 rs->sr_ctrls = NULL;
2624                                 send_ldap_result( op, rs );
2625                                 return rs->sr_err;
2626                         }
2627                 }
2628                 if ( BER_BVISEMPTY( &mincsn )) {
2629                         mincsn = maxcsn;
2630                         minsid = maxsid;
2631                 }
2632
2633                 /* If nothing has changed, shortcut it */
2634                 if ( !changed && !dirty ) {
2635                         do_present = 0;
2636 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2637                                 LDAPControl     *ctrls[2];
2638
2639                                 ctrls[0] = NULL;
2640                                 ctrls[1] = NULL;
2641                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2642                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2643                                 rs->sr_ctrls = ctrls;
2644                                 rs->sr_err = LDAP_SUCCESS;
2645                                 send_ldap_result( op, rs );
2646                                 rs->sr_ctrls = NULL;
2647                                 return rs->sr_err;
2648                         }
2649                         goto shortcut;
2650                 }
2651
2652                 /* Do we have a sessionlog for this search? */
2653                 sl=si->si_logs;
2654                 if ( sl ) {
2655                         int do_play = 0;
2656                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2657                         /* Are there any log entries, and is the consumer state
2658                          * present in the session log?
2659                          */
2660                         if ( sl->sl_num > 0 ) {
2661                                 int i;
2662                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2663                                         /* SID not present == new enough */
2664                                         if ( minsid < sl->sl_sids[i] ) {
2665                                                 do_play = 1;
2666                                                 break;
2667                                         }
2668                                         /* SID present */
2669                                         if ( minsid == sl->sl_sids[i] ) {
2670                                                 /* new enough? */
2671                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2672                                                         do_play = 1;
2673                                                 break;
2674                                         }
2675                                 }
2676                                 /* SID not present == new enough */
2677                                 if ( i == sl->sl_numcsns )
2678                                         do_play = 1;
2679                         }
2680                         if ( do_play ) {
2681                                 do_present = 0;
2682                                 /* mutex is unlocked in playlog */
2683                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2684                         } else {
2685                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2686                         }
2687                 }
2688                 /* Is the CSN still present in the database? */
2689                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2690                         /* No, so a reload is required */
2691                         /* the 2.2 consumer doesn't send this hint */
2692                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2693                                 if ( ctxcsn )
2694                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2695                                 if ( sids )
2696                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2697                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2698                                 rs->sr_text = "sync cookie is stale";
2699                                 goto bailout;
2700                         }
2701                         if ( srs->sr_state.ctxcsn ) {
2702                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2703                                 srs->sr_state.ctxcsn = NULL;
2704                         }
2705                         if ( srs->sr_state.sids ) {
2706                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2707                                 srs->sr_state.sids = NULL;
2708                         }
2709                         srs->sr_state.numcsns = 0;
2710                 } else {
2711                         gotstate = 1;
2712                         /* If changed and doing Present lookup, send Present UUIDs */
2713                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2714                                 LDAP_SUCCESS ) {
2715                                 if ( ctxcsn )
2716                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2717                                 if ( sids )
2718                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2719                                 goto bailout;
2720                         }
2721                 }
2722         } else {
2723                 /* No consumer state, assume something has changed */
2724                 changed = SS_CHANGED;
2725         }
2726
2727 shortcut:
2728         /* Append CSN range to search filter, save original filter
2729          * for persistent search evaluation
2730          */
2731         if ( sop ) {
2732                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2733                 sop->s_filterstr = op->ors_filterstr;
2734                 /* correct the refcount that was set to 2 before */
2735                 sop->s_inuse--;
2736         }
2737
2738         /* If something changed, find the changes */
2739         if ( gotstate && ( changed || dirty ) ) {
2740                 Filter *fand, *fava;
2741
2742                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2743                 fand->f_choice = LDAP_FILTER_AND;
2744                 fand->f_next = NULL;
2745                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2746                 fand->f_and = fava;
2747                 fava->f_choice = LDAP_FILTER_GE;
2748                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2749                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2750 #ifdef LDAP_COMP_MATCH
2751                 fava->f_ava->aa_cf = NULL;
2752 #endif
2753                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2754                 fava->f_next = op->ors_filter;
2755                 op->ors_filter = fand;
2756                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2757                 if ( sop ) {
2758                         sop->s_flags |= PS_FIX_FILTER;
2759                 }
2760         }
2761         if ( sop ) {
2762                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2763         }
2764
2765         /* Let our callback add needed info to returned entries */
2766         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2767         ss = (searchstate *)(cb+1);
2768         ss->ss_on = on;
2769         ss->ss_so = sop;
2770         ss->ss_flags = do_present | changed;
2771         ss->ss_ctxcsn = ctxcsn;
2772         ss->ss_numcsns = numcsns;
2773         ss->ss_sids = sids;
2774         cb->sc_response = syncprov_search_response;
2775         cb->sc_private = ss;
2776         cb->sc_next = op->o_callback;
2777         op->o_callback = cb;
2778
2779         /* If this is a persistent search and no changes were reported during
2780          * the refresh phase, just invoke the response callback to transition
2781          * us into persist phase
2782          */
2783         if ( !changed && !dirty ) {
2784                 rs->sr_err = LDAP_SUCCESS;
2785                 rs->sr_nentries = 0;
2786                 send_ldap_result( op, rs );
2787                 return rs->sr_err;
2788         }
2789         return SLAP_CB_CONTINUE;
2790 }
2791
2792 static int
2793 syncprov_operational(
2794         Operation *op,
2795         SlapReply *rs )
2796 {
2797         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2798         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2799
2800         /* This prevents generating unnecessarily; frontend will strip
2801          * any statically stored copy.
2802          */
2803         if ( op->o_sync != SLAP_CONTROL_NONE )
2804                 return SLAP_CB_CONTINUE;
2805
2806         if ( rs->sr_entry &&
2807                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2808
2809                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2810                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2811                         Attribute *a, **ap = NULL;
2812
2813                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2814                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2815                                         break;
2816                         }
2817
2818                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2819                         if ( si->si_ctxcsn ) {
2820                                 if ( !a ) {
2821                                         for ( ap = &rs->sr_operational_attrs; *ap;
2822                                                 ap=&(*ap)->a_next );
2823
2824                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2825                                         *ap = a;
2826                                 }
2827
2828                                 if ( !ap ) {
2829                                         if ( rs_entry2modifiable( op, rs, on )) {
2830                                                 a = attr_find( rs->sr_entry->e_attrs,
2831                                                         slap_schema.si_ad_contextCSN );
2832                                         }
2833                                         if ( a->a_nvals != a->a_vals ) {
2834                                                 ber_bvarray_free( a->a_nvals );
2835                                         }
2836                                         a->a_nvals = NULL;
2837                                         ber_bvarray_free( a->a_vals );
2838                                         a->a_vals = NULL;
2839                                         a->a_numvals = 0;
2840                                 }
2841                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2842                         }
2843                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2844                 }
2845         }
2846         return SLAP_CB_CONTINUE;
2847 }
2848
2849 enum {
2850         SP_CHKPT = 1,
2851         SP_SESSL,
2852         SP_NOPRES,
2853         SP_USEHINT
2854 };
2855
2856 static ConfigDriver sp_cf_gen;
2857
2858 static ConfigTable spcfg[] = {
2859         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2860                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2861                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2862                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2863         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2864                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2865                         "DESC 'Session log size in ops' "
2866                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2867         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2868                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2869                         "DESC 'Omit Present phase processing' "
2870                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2871         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2872                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2873                         "DESC 'Observe Reload Hint in Request control' "
2874                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2875         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2876 };
2877
2878 static ConfigOCs spocs[] = {
2879         { "( OLcfgOvOc:1.1 "
2880                 "NAME 'olcSyncProvConfig' "
2881                 "DESC 'SyncRepl Provider configuration' "
2882                 "SUP olcOverlayConfig "
2883                 "MAY ( olcSpCheckpoint "
2884                         "$ olcSpSessionlog "
2885                         "$ olcSpNoPresent "
2886                         "$ olcSpReloadHint "
2887                 ") )",
2888                         Cft_Overlay, spcfg },
2889         { NULL, 0, NULL }
2890 };
2891
2892 static int
2893 sp_cf_gen(ConfigArgs *c)
2894 {
2895         slap_overinst           *on = (slap_overinst *)c->bi;
2896         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2897         int rc = 0;
2898
2899         if ( c->op == SLAP_CONFIG_EMIT ) {
2900                 switch ( c->type ) {
2901                 case SP_CHKPT:
2902                         if ( si->si_chkops || si->si_chktime ) {
2903                                 struct berval bv;
2904                                 /* we assume si_chktime is a multiple of 60
2905                                  * because the parsed value was originally
2906                                  * multiplied by 60 */
2907                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2908                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2909                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2910                                         rc = 1;
2911                                 } else {
2912                                         bv.bv_val = c->cr_msg;
2913                                         value_add_one( &c->rvalue_vals, &bv );
2914                                 }
2915                         } else {
2916                                 rc = 1;
2917                         }
2918                         break;
2919                 case SP_SESSL:
2920                         if ( si->si_logs ) {
2921                                 c->value_int = si->si_logs->sl_size;
2922                         } else {
2923                                 rc = 1;
2924                         }
2925                         break;
2926                 case SP_NOPRES:
2927                         if ( si->si_nopres ) {
2928                                 c->value_int = 1;
2929                         } else {
2930                                 rc = 1;
2931                         }
2932                         break;
2933                 case SP_USEHINT:
2934                         if ( si->si_usehint ) {
2935                                 c->value_int = 1;
2936                         } else {
2937                                 rc = 1;
2938                         }
2939                         break;
2940                 }
2941                 return rc;
2942         } else if ( c->op == LDAP_MOD_DELETE ) {
2943                 switch ( c->type ) {
2944                 case SP_CHKPT:
2945                         si->si_chkops = 0;
2946                         si->si_chktime = 0;
2947                         break;
2948                 case SP_SESSL:
2949                         if ( si->si_logs )
2950                                 si->si_logs->sl_size = 0;
2951                         else
2952                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2953                         break;
2954                 case SP_NOPRES:
2955                         if ( si->si_nopres )
2956                                 si->si_nopres = 0;
2957                         else
2958                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2959                         break;
2960                 case SP_USEHINT:
2961                         if ( si->si_usehint )
2962                                 si->si_usehint = 0;
2963                         else
2964                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2965                         break;
2966                 }
2967                 return rc;
2968         }
2969         switch ( c->type ) {
2970         case SP_CHKPT:
2971                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2972                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2973                                 c->argv[0], c->argv[1] );
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                 if ( si->si_chkops <= 0 ) {
2979                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2980                                 c->argv[0], si->si_chkops );
2981                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2982                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2983                         return ARG_BAD_CONF;
2984                 }
2985                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2986                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2987                                 c->argv[0], c->argv[1] );
2988                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2989                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2990                         return ARG_BAD_CONF;
2991                 }
2992                 if ( si->si_chktime <= 0 ) {
2993                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2994                                 c->argv[0], si->si_chkops );
2995                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2996                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2997                         return ARG_BAD_CONF;
2998                 }
2999                 si->si_chktime *= 60;
3000                 break;
3001         case SP_SESSL: {
3002                 sessionlog *sl;
3003                 int size = c->value_int;
3004
3005                 if ( size < 0 ) {
3006                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3007                                 c->argv[0], size );
3008                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3009                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3010                         return ARG_BAD_CONF;
3011                 }
3012                 sl = si->si_logs;
3013                 if ( !sl ) {
3014                         sl = ch_malloc( sizeof( sessionlog ));
3015                         sl->sl_mincsn = NULL;
3016                         sl->sl_sids = NULL;
3017                         sl->sl_num = 0;
3018                         sl->sl_numcsns = 0;
3019                         sl->sl_head = sl->sl_tail = NULL;
3020                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3021                         si->si_logs = sl;
3022                 }
3023                 sl->sl_size = size;
3024                 }
3025                 break;
3026         case SP_NOPRES:
3027                 si->si_nopres = c->value_int;
3028                 break;
3029         case SP_USEHINT:
3030                 si->si_usehint = c->value_int;
3031                 break;
3032         }
3033         return rc;
3034 }
3035
3036 /* ITS#3456 we cannot run this search on the main thread, must use a
3037  * child thread in order to insure we have a big enough stack.
3038  */
3039 static void *
3040 syncprov_db_otask(
3041         void *ptr
3042 )
3043 {
3044         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3045         return NULL;
3046 }
3047
3048
3049 /* Read any existing contextCSN from the underlying db.
3050  * Then search for any entries newer than that. If no value exists,
3051  * just generate it. Cache whatever result.
3052  */
3053 static int
3054 syncprov_db_open(
3055         BackendDB *be,
3056         ConfigReply *cr
3057 )
3058 {
3059         slap_overinst   *on = (slap_overinst *) be->bd_info;
3060         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3061
3062         Connection conn = { 0 };
3063         OperationBuffer opbuf;
3064         Operation *op;
3065         Entry *e = NULL;
3066         Attribute *a;
3067         int rc;
3068         void *thrctx = NULL;
3069
3070         if ( !SLAP_LASTMOD( be )) {
3071                 Debug( LDAP_DEBUG_ANY,
3072                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3073                 return -1;
3074         }
3075
3076         if ( slapMode & SLAP_TOOL_MODE ) {
3077                 return 0;
3078         }
3079
3080         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3081         if ( rc ) {
3082                 return rc;
3083         }
3084
3085         thrctx = ldap_pvt_thread_pool_context();
3086         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3087         op = &opbuf.ob_op;
3088         op->o_bd = be;
3089         op->o_dn = be->be_rootdn;
3090         op->o_ndn = be->be_rootndn;
3091
3092         if ( SLAP_SYNC_SUBENTRY( be )) {
3093                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3094                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3095         } else {
3096                 si->si_contextdn = be->be_nsuffix[0];
3097         }
3098         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3099                 slap_schema.si_ad_contextCSN, 0, &e, on );
3100
3101         if ( e ) {
3102                 ldap_pvt_thread_t tid;
3103
3104                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3105                 if ( a ) {
3106                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3107                         si->si_numcsns = a->a_numvals;
3108                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3109                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3110                 }
3111                 overlay_entry_release_ov( op, e, 0, on );
3112                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3113                         op->o_tag = LDAP_REQ_SEARCH;
3114                         op->o_req_dn = be->be_suffix[0];
3115                         op->o_req_ndn = be->be_nsuffix[0];
3116                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3117                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3118                         ldap_pvt_thread_join( tid, NULL );
3119                 }
3120         }
3121
3122         /* Didn't find a contextCSN, should we generate one? */
3123         if ( !si->si_ctxcsn ) {
3124                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3125                 struct berval csn;
3126
3127                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3128                 /* If we're also a consumer, then don't generate anything.
3129                  * Wait for our provider to send it to us, or for a local
3130                  * modify if we have multimaster.
3131                  */
3132                         goto out;
3133                 }
3134                 csn.bv_val = csnbuf;
3135                 csn.bv_len = sizeof( csnbuf );
3136                 slap_get_csn( op, &csn, 0 );
3137                 value_add_one( &si->si_ctxcsn, &csn );
3138                 si->si_numcsns = 1;
3139                 si->si_sids = ch_malloc( sizeof(int) );
3140                 si->si_sids[0] = slap_serverID;
3141
3142                 /* make sure we do a checkpoint on close */
3143                 si->si_numops++;
3144         }
3145
3146         /* Initialize the sessionlog mincsn */
3147         if ( si->si_logs && si->si_numcsns ) {
3148                 sessionlog *sl = si->si_logs;
3149                 int i;
3150                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3151                 sl->sl_numcsns = si->si_numcsns;
3152                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3153                 for ( i=0; i < si->si_numcsns; i++ )
3154                         sl->sl_sids[i] = si->si_sids[i];
3155         }
3156
3157 out:
3158         op->o_bd->bd_info = (BackendInfo *)on;
3159         return 0;
3160 }
3161
3162 /* Write the current contextCSN into the underlying db.
3163  */
3164 static int
3165 syncprov_db_close(
3166         BackendDB *be,
3167         ConfigReply *cr
3168 )
3169 {
3170     slap_overinst   *on = (slap_overinst *) be->bd_info;
3171     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3172 #ifdef SLAP_CONFIG_DELETE
3173         syncops *so, *sonext;
3174 #endif /* SLAP_CONFIG_DELETE */
3175
3176         if ( slapMode & SLAP_TOOL_MODE ) {
3177                 return 0;
3178         }
3179         if ( si->si_numops ) {
3180                 Connection conn = {0};
3181                 OperationBuffer opbuf;
3182                 Operation *op;
3183                 void *thrctx;
3184
3185                 thrctx = ldap_pvt_thread_pool_context();
3186                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3187                 op = &opbuf.ob_op;
3188                 op->o_bd = be;
3189                 op->o_dn = be->be_rootdn;
3190                 op->o_ndn = be->be_rootndn;
3191                 syncprov_checkpoint( op, on );
3192         }
3193
3194 #ifdef SLAP_CONFIG_DELETE
3195         if ( !slapd_shutdown ) {
3196                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3197                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3198                         SlapReply rs = {REP_RESULT};
3199                         rs.sr_err = LDAP_UNAVAILABLE;
3200                         send_ldap_result( so->s_op, &rs );
3201                         sonext=so->s_next;
3202                         syncprov_drop_psearch( so, 0);
3203                 }
3204                 si->si_ops=NULL;
3205                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3206         }
3207         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3208 #endif /* SLAP_CONFIG_DELETE */
3209
3210     return 0;
3211 }
3212
3213 static int
3214 syncprov_db_init(
3215         BackendDB *be,
3216         ConfigReply *cr
3217 )
3218 {
3219         slap_overinst   *on = (slap_overinst *)be->bd_info;
3220         syncprov_info_t *si;
3221
3222         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3223                 Debug( LDAP_DEBUG_ANY,
3224                         "syncprov must be instantiated within a database.\n",
3225                         0, 0, 0 );
3226                 return 1;
3227         }
3228
3229         si = ch_calloc(1, sizeof(syncprov_info_t));
3230         on->on_bi.bi_private = si;
3231         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3232         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3233         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3234         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3235
3236         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3237         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3238         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3239         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3240
3241         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3242         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3243
3244         return 0;
3245 }
3246
3247 static int
3248 syncprov_db_destroy(
3249         BackendDB *be,
3250         ConfigReply *cr
3251 )
3252 {
3253         slap_overinst   *on = (slap_overinst *)be->bd_info;
3254         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3255
3256         if ( si ) {
3257                 if ( si->si_logs ) {
3258                         sessionlog *sl = si->si_logs;
3259                         slog_entry *se = sl->sl_head;
3260
3261                         while ( se ) {
3262                                 slog_entry *se_next = se->se_next;
3263                                 ch_free( se );
3264                                 se = se_next;
3265                         }
3266                         if ( sl->sl_mincsn )
3267                                 ber_bvarray_free( sl->sl_mincsn );
3268                         if ( sl->sl_sids )
3269                                 ch_free( sl->sl_sids );
3270
3271                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3272                         ch_free( si->si_logs );
3273                 }
3274                 if ( si->si_ctxcsn )
3275                         ber_bvarray_free( si->si_ctxcsn );
3276                 if ( si->si_sids )
3277                         ch_free( si->si_sids );
3278                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3279                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3280                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3281                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3282                 ch_free( si );
3283         }
3284
3285         return 0;
3286 }
3287
3288 static int syncprov_parseCtrl (
3289         Operation *op,
3290         SlapReply *rs,
3291         LDAPControl *ctrl )
3292 {
3293         ber_tag_t tag;
3294         BerElementBuffer berbuf;
3295         BerElement *ber = (BerElement *)&berbuf;
3296         ber_int_t mode;
3297         ber_len_t len;
3298         struct berval cookie = BER_BVNULL;
3299         sync_control *sr;
3300         int rhint = 0;
3301
3302         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3303                 rs->sr_text = "Sync control specified multiple times";
3304                 return LDAP_PROTOCOL_ERROR;
3305         }
3306
3307         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3308                 rs->sr_text = "Sync control specified with pagedResults control";
3309                 return LDAP_PROTOCOL_ERROR;
3310         }
3311
3312         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3313                 rs->sr_text = "Sync control value is absent";
3314                 return LDAP_PROTOCOL_ERROR;
3315         }
3316
3317         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3318                 rs->sr_text = "Sync control value is empty";
3319                 return LDAP_PROTOCOL_ERROR;
3320         }
3321
3322         /* Parse the control value
3323          *      syncRequestValue ::= SEQUENCE {
3324          *              mode   ENUMERATED {
3325          *                      -- 0 unused
3326          *                      refreshOnly             (1),
3327          *                      -- 2 reserved
3328          *                      refreshAndPersist       (3)
3329          *              },
3330          *              cookie  syncCookie OPTIONAL
3331          *      }
3332          */
3333
3334         ber_init2( ber, &ctrl->ldctl_value, 0 );
3335
3336         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3337                 rs->sr_text = "Sync control : mode decoding error";
3338                 return LDAP_PROTOCOL_ERROR;
3339         }
3340
3341         switch( mode ) {
3342         case LDAP_SYNC_REFRESH_ONLY:
3343                 mode = SLAP_SYNC_REFRESH;
3344                 break;
3345         case LDAP_SYNC_REFRESH_AND_PERSIST:
3346                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3347                 break;
3348         default:
3349                 rs->sr_text = "Sync control : unknown update mode";
3350                 return LDAP_PROTOCOL_ERROR;
3351         }
3352
3353         tag = ber_peek_tag( ber, &len );
3354
3355         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3356                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3357                         rs->sr_text = "Sync control : cookie decoding error";
3358                         return LDAP_PROTOCOL_ERROR;
3359                 }
3360                 tag = ber_peek_tag( ber, &len );
3361         }
3362         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3363                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3364                         rs->sr_text = "Sync control : rhint decoding error";
3365                         return LDAP_PROTOCOL_ERROR;
3366                 }
3367         }
3368         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3369                         rs->sr_text = "Sync control : decoding error";
3370                         return LDAP_PROTOCOL_ERROR;
3371         }
3372         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3373         sr->sr_rhint = rhint;
3374         if (!BER_BVISNULL(&cookie)) {
3375                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3376                 /* If parse fails, pretend no cookie was sent */
3377                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3378                         sr->sr_state.rid == -1 ) {
3379                         if ( sr->sr_state.ctxcsn ) {
3380                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3381                                 sr->sr_state.ctxcsn = NULL;
3382                         }
3383                         sr->sr_state.numcsns = 0;
3384                 }
3385         }
3386
3387         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3388
3389         op->o_sync = ctrl->ldctl_iscritical
3390                 ? SLAP_CONTROL_CRITICAL
3391                 : SLAP_CONTROL_NONCRITICAL;
3392
3393         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3394
3395         return LDAP_SUCCESS;
3396 }
3397
3398 /* This overlay is set up for dynamic loading via moduleload. For static
3399  * configuration, you'll need to arrange for the slap_overinst to be
3400  * initialized and registered by some other function inside slapd.
3401  */
3402
3403 static slap_overinst            syncprov;
3404
3405 int
3406 syncprov_initialize()
3407 {
3408         int rc;
3409
3410         rc = register_supported_control( LDAP_CONTROL_SYNC,
3411                 SLAP_CTRL_SEARCH, NULL,
3412                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3413         if ( rc != LDAP_SUCCESS ) {
3414                 Debug( LDAP_DEBUG_ANY,
3415                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3416                 return rc;
3417         }
3418
3419         syncprov.on_bi.bi_type = "syncprov";
3420         syncprov.on_bi.bi_db_init = syncprov_db_init;
3421         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3422         syncprov.on_bi.bi_db_open = syncprov_db_open;
3423         syncprov.on_bi.bi_db_close = syncprov_db_close;
3424
3425         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3426         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3427
3428         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3429         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3430         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3431         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3432         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3433         syncprov.on_bi.bi_op_search = syncprov_op_search;
3434         syncprov.on_bi.bi_extended = syncprov_op_extended;
3435         syncprov.on_bi.bi_operational = syncprov_operational;
3436
3437         syncprov.on_bi.bi_cf_ocs = spocs;
3438
3439         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3440
3441         rc = config_register_schema( spcfg, spocs );
3442         if ( rc ) return rc;
3443
3444         return overlay_register( &syncprov );
3445 }
3446
3447 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3448 int
3449 init_module( int argc, char *argv[] )
3450 {
3451         return syncprov_initialize();
3452 }
3453 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3454
3455 #endif /* defined(SLAPD_OVER_SYNCPROV) */