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 2004-2012 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         BerVarray       sl_mincsn;
 117         int             *sl_sids;
 118         int             sl_numcsns;
 119         int             sl_num;
 120         int             sl_size;
 121         slog_entry *sl_head;
 122         slog_entry *sl_tail;
 123         ldap_pvt_thread_mutex_t sl_mutex;
 124 } sessionlog;
 125
 126 /* The main state for this overlay */
 127 typedef struct syncprov_info_t {
 128         syncops         *si_ops;
 129         struct berval   si_contextdn;
 130         BerVarray       si_ctxcsn;      /* ldapsync context */
 131         int             *si_sids;
 132         int             si_numcsns;
 133         int             si_chkops;      /* checkpointing info */
 134         int             si_chktime;
 135         int             si_numops;      /* number of ops since last checkpoint */
 136         int             si_nopres;      /* Skip present phase */
 137         int             si_usehint;     /* use reload hint */
 138         int             si_active;      /* True if there are active mods */
 139         int             si_dirty;       /* True if the context is dirty, i.e changes
 140                                                  * have been made without updating the csn. */
 141         time_t  si_chklast;     /* time of last checkpoint */
 142         Avlnode *si_mods;       /* entries being modified */
 143         sessionlog      *si_logs;
 144         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 145         ldap_pvt_thread_mutex_t si_ops_mutex;
 146         ldap_pvt_thread_mutex_t si_mods_mutex;
 147         ldap_pvt_thread_mutex_t si_resp_mutex;
 148 } syncprov_info_t;
 149
 150 typedef struct opcookie {
 151         slap_overinst *son;
 152         syncmatches *smatches;
 153         modtarget *smt;
 154         Entry *se;
 155         struct berval sdn;      /* DN of entry, for deletes */
 156         struct berval sndn;
 157         struct berval suuid;    /* UUID of entry */
 158         struct berval sctxcsn;
 159         short osid;     /* sid of op csn */
 160         short rsid;     /* sid of relay */
 161         short sreference;       /* Is the entry a reference? */
 162 } opcookie;
 163
 164 typedef struct mutexint {
 165         ldap_pvt_thread_mutex_t mi_mutex;
 166         int mi_int;
 167 } mutexint;
 168
 169 typedef struct fbase_cookie {
 170         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 171         syncops *fss;   /* persistent search we're testing against */
 172         int fbase;      /* if TRUE we found the search base and it's still valid */
 173         int fscope;     /* if TRUE then fdn is within the psearch scope */
 174 } fbase_cookie;
 175
 176 static AttributeName csn_anlist[3];
 177 static AttributeName uuid_anlist[2];
 178
 179 /* Build a LDAPsync intermediate state control */
 180 static int
 181 syncprov_state_ctrl(
 182         Operation       *op,
 183         SlapReply       *rs,
 184         Entry           *e,
 185         int             entry_sync_state,
 186         LDAPControl     **ctrls,
 187         int             num_ctrls,
 188         int             send_cookie,
 189         struct berval   *cookie )
 190 {
 191         Attribute* a;
 192         int ret;
 193
 194         BerElementBuffer berbuf;
 195         BerElement *ber = (BerElement *)&berbuf;
 196
 197         struct berval   entryuuid_bv = BER_BVNULL;
 198
 199         ber_init2( ber, 0, LBER_USE_DER );
 200         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 201
 202         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 203
 204         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 205                 AttributeDescription *desc = a->a_desc;
 206                 if ( desc == slap_schema.si_ad_entryUUID ) {
 207                         entryuuid_bv = a->a_nvals[0];
 208                         break;
 209                 }
 210         }
 211
 212         /* FIXME: what if entryuuid is NULL or empty ? */
 213
 214         if ( send_cookie && cookie ) {
 215                 ber_printf( ber, "{eOON}",
 216                         entry_sync_state, &entryuuid_bv, cookie );
 217         } else {
 218                 ber_printf( ber, "{eON}",
 219                         entry_sync_state, &entryuuid_bv );
 220         }
 221
 222         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 223         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 224         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 225
 226         ber_free_buf( ber );
 227
 228         if ( ret < 0 ) {
 229                 Debug( LDAP_DEBUG_TRACE,
 230                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 231                         ret, 0, 0 );
 232                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 233                 return LDAP_OTHER;
 234         }
 235
 236         return LDAP_SUCCESS;
 237 }
 238
 239 /* Build a LDAPsync final state control */
 240 static int
 241 syncprov_done_ctrl(
 242         Operation       *op,
 243         SlapReply       *rs,
 244         LDAPControl     **ctrls,
 245         int                     num_ctrls,
 246         int                     send_cookie,
 247         struct berval *cookie,
 248         int                     refreshDeletes )
 249 {
 250         int ret;
 251         BerElementBuffer berbuf;
 252         BerElement *ber = (BerElement *)&berbuf;
 253
 254         ber_init2( ber, NULL, LBER_USE_DER );
 255         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 256
 257         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 258
 259         ber_printf( ber, "{" );
 260         if ( send_cookie && cookie ) {
 261                 ber_printf( ber, "O", cookie );
 262         }
 263         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 264                 ber_printf( ber, "b", refreshDeletes );
 265         }
 266         ber_printf( ber, "N}" );
 267
 268         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 269         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 270         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 271
 272         ber_free_buf( ber );
 273
 274         if ( ret < 0 ) {
 275                 Debug( LDAP_DEBUG_TRACE,
 276                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 277                         ret, 0, 0 );
 278                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 279                 return LDAP_OTHER;
 280         }
 281
 282         return LDAP_SUCCESS;
 283 }
 284
 285 static int
 286 syncprov_sendinfo(
 287         Operation       *op,
 288         SlapReply       *rs,
 289         int                     type,
 290         struct berval *cookie,
 291         int                     refreshDone,
 292         BerVarray       syncUUIDs,
 293         int                     refreshDeletes )
 294 {
 295         BerElementBuffer berbuf;
 296         BerElement *ber = (BerElement *)&berbuf;
 297         struct berval rspdata;
 298
 299         int ret;
 300
 301         ber_init2( ber, NULL, LBER_USE_DER );
 302         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 303
 304         if ( type ) {
 305                 switch ( type ) {
 306                 case LDAP_TAG_SYNC_NEW_COOKIE:
 307                         ber_printf( ber, "tO", type, cookie );
 308                         break;
 309                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 310                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 311                         ber_printf( ber, "t{", type );
 312                         if ( cookie ) {
 313                                 ber_printf( ber, "O", cookie );
 314                         }
 315                         if ( refreshDone == 0 ) {
 316                                 ber_printf( ber, "b", refreshDone );
 317                         }
 318                         ber_printf( ber, "N}" );
 319                         break;
 320                 case LDAP_TAG_SYNC_ID_SET:
 321                         ber_printf( ber, "t{", type );
 322                         if ( cookie ) {
 323                                 ber_printf( ber, "O", cookie );
 324                         }
 325                         if ( refreshDeletes == 1 ) {
 326                                 ber_printf( ber, "b", refreshDeletes );
 327                         }
 328                         ber_printf( ber, "[W]", syncUUIDs );
 329                         ber_printf( ber, "N}" );
 330                         break;
 331                 default:
 332                         Debug( LDAP_DEBUG_TRACE,
 333                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 334                                 type, 0, 0 );
 335                         return LDAP_OTHER;
 336                 }
 337         }
 338
 339         ret = ber_flatten2( ber, &rspdata, 0 );
 340
 341         if ( ret < 0 ) {
 342                 Debug( LDAP_DEBUG_TRACE,
 343                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 344                         ret, 0, 0 );
 345                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 346                 return LDAP_OTHER;
 347         }
 348
 349         rs->sr_rspoid = LDAP_SYNC_INFO;
 350         rs->sr_rspdata = &rspdata;
 351         send_ldap_intermediate( op, rs );
 352         rs->sr_rspdata = NULL;
 353         ber_free_buf( ber );
 354
 355         return LDAP_SUCCESS;
 356 }
 357
 358 /* Find a modtarget in an AVL tree */
 359 static int
 360 sp_avl_cmp( const void *c1, const void *c2 )
 361 {
 362         const modtarget *m1, *m2;
 363         int rc;
 364
 365         m1 = c1; m2 = c2;
 366         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 367
 368         if ( rc ) return rc;
 369         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 370 }
 371
 372 /* syncprov_findbase:
 373  *   finds the true DN of the base of a search (with alias dereferencing) and
 374  * checks to make sure the base entry doesn't get replaced with a different
 375  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 376  * change is detected, any persistent search on this base must be terminated /
 377  * reloaded.
 378  *   On the first call, we just save the DN and entryID. On subsequent calls
 379  * we compare the DN and entryID with the saved values.
 380  */
 381 static int
 382 findbase_cb( Operation *op, SlapReply *rs )
 383 {
 384         slap_callback *sc = op->o_callback;
 385
 386         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 387                 fbase_cookie *fc = sc->sc_private;
 388
 389                 /* If no entryID, we're looking for the first time.
 390                  * Just store whatever we got.
 391                  */
 392                 if ( fc->fss->s_eid == NOID ) {
 393                         fc->fbase = 2;
 394                         fc->fss->s_eid = rs->sr_entry->e_id;
 395                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 396
 397                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 398                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 399
 400                 /* OK, the DN is the same and the entryID is the same. */
 401                         fc->fbase = 1;
 402                 }
 403         }
 404         if ( rs->sr_err != LDAP_SUCCESS ) {
 405                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 406         }
 407         return LDAP_SUCCESS;
 408 }
 409
 410 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 411 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 412
 413 static int
 414 syncprov_findbase( Operation *op, fbase_cookie *fc )
 415 {
 416         /* Use basic parameters from syncrepl search, but use
 417          * current op's threadctx / tmpmemctx
 418          */
 419         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 420         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 421                 slap_callback cb = {0};
 422                 Operation fop;
 423                 SlapReply frs = { REP_RESULT };
 424                 int rc;
 425
 426                 fc->fss->s_flags ^= PS_FIND_BASE;
 427                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 428
 429                 fop = *fc->fss->s_op;
 430
 431                 fop.o_bd = fop.o_bd->bd_self;
 432                 fop.o_hdr = op->o_hdr;
 433                 fop.o_time = op->o_time;
 434                 fop.o_tincr = op->o_tincr;
 435
 436                 cb.sc_response = findbase_cb;
 437                 cb.sc_private = fc;
 438
 439                 fop.o_sync_mode = 0;    /* turn off sync mode */
 440                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 441                 fop.o_callback = &cb;
 442                 LDAP_SLIST_INIT( &fop.o_extra );
 443                 fop.o_tag = LDAP_REQ_SEARCH;
 444                 fop.ors_scope = LDAP_SCOPE_BASE;
 445                 fop.ors_limit = NULL;
 446                 fop.ors_slimit = 1;
 447                 fop.ors_tlimit = SLAP_NO_LIMIT;
 448                 fop.ors_attrs = slap_anlist_no_attrs;
 449                 fop.ors_attrsonly = 1;
 450                 fop.ors_filter = &generic_filter;
 451                 fop.ors_filterstr = generic_filterstr;
 452
 453                 rc = fop.o_bd->be_search( &fop, &frs );
 454         } else {
 455                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 456                 fc->fbase = 1;
 457         }
 458
 459         /* After the first call, see if the fdn resides in the scope */
 460         if ( fc->fbase == 1 ) {
 461                 switch ( fc->fss->s_op->ors_scope ) {
 462                 case LDAP_SCOPE_BASE:
 463                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 464                         break;
 465                 case LDAP_SCOPE_ONELEVEL: {
 466                         struct berval pdn;
 467                         dnParent( fc->fdn, &pdn );
 468                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 469                         break; }
 470                 case LDAP_SCOPE_SUBTREE:
 471                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 472                         break;
 473                 case LDAP_SCOPE_SUBORDINATE:
 474                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 475                                 !dn_match( fc->fdn, &fc->fss->s_base );
 476                         break;
 477                 }
 478         }
 479
 480         if ( fc->fbase )
 481                 return LDAP_SUCCESS;
 482
 483         /* If entryID has changed, then the base of this search has
 484          * changed. Invalidate the psearch.
 485          */
 486         return LDAP_NO_SUCH_OBJECT;
 487 }
 488
 489 /* syncprov_findcsn:
 490  *   This function has three different purposes, but they all use a search
 491  * that filters on entryCSN so they're combined here.
 492  * 1: at startup time, after a contextCSN has been read from the database,
 493  * we search for all entries with CSN >= contextCSN in case the contextCSN
 494  * was not checkpointed at the previous shutdown.
 495  *
 496  * 2: when the current contextCSN is known and we have a sync cookie, we search
 497  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 498  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 499  *
 500  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 501  * CSN, and generate Present records for them. We always collect this result
 502  * in SyncID sets, even if there's only one match.
 503  */
 504 typedef enum find_csn_t {
 505         FIND_MAXCSN     = 1,
 506         FIND_CSN        = 2,
 507         FIND_PRESENT    = 3
 508 } find_csn_t;
 509
 510 static int
 511 findmax_cb( Operation *op, SlapReply *rs )
 512 {
 513         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 514                 struct berval *maxcsn = op->o_callback->sc_private;
 515                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 516                         slap_schema.si_ad_entryCSN );
 517
 518                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 519                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 520                         maxcsn->bv_len = a->a_vals[0].bv_len;
 521                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 522                 }
 523         }
 524         return LDAP_SUCCESS;
 525 }
 526
 527 static int
 528 findcsn_cb( Operation *op, SlapReply *rs )
 529 {
 530         slap_callback *sc = op->o_callback;
 531
 532         /* We just want to know that at least one exists, so it's OK if
 533          * we exceed the unchecked limit.
 534          */
 535         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 536                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 537                 sc->sc_private = (void *)1;
 538         }
 539         return LDAP_SUCCESS;
 540 }
 541
 542 /* Build a list of entryUUIDs for sending in a SyncID set */
 543
 544 #define UUID_LEN        16
 545
 546 typedef struct fpres_cookie {
 547         int num;
 548         BerVarray uuids;
 549         char *last;
 550 } fpres_cookie;
 551
 552 static int
 553 findpres_cb( Operation *op, SlapReply *rs )
 554 {
 555         slap_callback *sc = op->o_callback;
 556         fpres_cookie *pc = sc->sc_private;
 557         Attribute *a;
 558         int ret = SLAP_CB_CONTINUE;
 559
 560         switch ( rs->sr_type ) {
 561         case REP_SEARCH:
 562                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 563                 if ( a ) {
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 566                                 pc->uuids[pc->num].bv_len );
 567                         pc->num++;
 568                         pc->last = pc->uuids[pc->num].bv_val;
 569                         pc->uuids[pc->num].bv_val = NULL;
 570                 }
 571                 ret = LDAP_SUCCESS;
 572                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 573                         break;
 574                 /* FALLTHRU */
 575         case REP_RESULT:
 576                 ret = rs->sr_err;
 577                 if ( pc->num ) {
 578                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 579                                 0, pc->uuids, 0 );
 580                         pc->uuids[pc->num].bv_val = pc->last;
 581                         pc->num = 0;
 582                         pc->last = pc->uuids[0].bv_val;
 583                 }
 584                 break;
 585         default:
 586                 break;
 587         }
 588         return ret;
 589 }
 590
 591 static int
 592 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 593 {
 594         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 595         syncprov_info_t         *si = on->on_bi.bi_private;
 596
 597         slap_callback cb = {0};
 598         Operation fop;
 599         SlapReply frs = { REP_RESULT };
 600         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 601         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 602         struct berval maxcsn;
 603         Filter cf;
 604         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 605         fpres_cookie pcookie;
 606         sync_control *srs = NULL;
 607         struct slap_limits_set fc_limits;
 608         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 609         int maxid;
 610
 611         if ( mode != FIND_MAXCSN ) {
 612                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 613         }
 614
 615         fop = *op;
 616         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 617         /* We want pure entries, not referrals */
 618         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 619
 620         cf.f_ava = &eq;
 621         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 622         BER_BVZERO( &cf.f_av_value );
 623         cf.f_next = NULL;
 624
 625         fop.o_callback = &cb;
 626         fop.ors_limit = NULL;
 627         fop.ors_tlimit = SLAP_NO_LIMIT;
 628         fop.ors_filter = &cf;
 629         fop.ors_filterstr.bv_val = buf;
 630
 631 again:
 632         switch( mode ) {
 633         case FIND_MAXCSN:
 634                 cf.f_choice = LDAP_FILTER_GE;
 635                 /* If there are multiple CSNs, use the one with our serverID */
 636                 for ( i=0; i<si->si_numcsns; i++) {
 637                         if ( slap_serverID == si->si_sids[i] ) {
 638                                 maxid = i;
 639                                 break;
 640                         }
 641                 }
 642                 if ( i == si->si_numcsns ) {
 643                         /* No match: this is multimaster, and none of the content in the DB
 644                          * originated locally. Treat like no CSN.
 645                          */
 646                         return LDAP_NO_SUCH_OBJECT;
 647                 }
 648                 cf.f_av_value = si->si_ctxcsn[maxid];
 649                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 650                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 651                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 652                         return LDAP_OTHER;
 653                 }
 654                 fop.ors_attrsonly = 0;
 655                 fop.ors_attrs = csn_anlist;
 656                 fop.ors_slimit = SLAP_NO_LIMIT;
 657                 cb.sc_private = &maxcsn;
 658                 cb.sc_response = findmax_cb;
 659                 strcpy( cbuf, cf.f_av_value.bv_val );
 660                 maxcsn.bv_val = cbuf;
 661                 maxcsn.bv_len = cf.f_av_value.bv_len;
 662                 break;
 663         case FIND_CSN:
 664                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 665                         cf.f_av_value = *csn;
 666                 }
 667                 fop.o_dn = op->o_bd->be_rootdn;
 668                 fop.o_ndn = op->o_bd->be_rootndn;
 669                 fop.o_req_dn = op->o_bd->be_suffix[0];
 670                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 671                 /* Look for exact match the first time */
 672                 if ( findcsn_retry ) {
 673                         cf.f_choice = LDAP_FILTER_EQUALITY;
 674                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 675                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 676                 /* On retry, look for <= */
 677                 } else {
 678                         cf.f_choice = LDAP_FILTER_LE;
 679                         fop.ors_limit = &fc_limits;
 680                         memset( &fc_limits, 0, sizeof( fc_limits ));
 681                         fc_limits.lms_s_unchecked = 1;
 682                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 683                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 684                 }
 685                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 686                         return LDAP_OTHER;
 687                 }
 688                 fop.ors_attrsonly = 1;
 689                 fop.ors_attrs = slap_anlist_no_attrs;
 690                 fop.ors_slimit = 1;
 691                 cb.sc_private = NULL;
 692                 cb.sc_response = findcsn_cb;
 693                 break;
 694         case FIND_PRESENT:
 695                 fop.ors_filter = op->ors_filter;
 696                 fop.ors_filterstr = op->ors_filterstr;
 697                 fop.ors_attrsonly = 0;
 698                 fop.ors_attrs = uuid_anlist;
 699                 fop.ors_slimit = SLAP_NO_LIMIT;
 700                 cb.sc_private = &pcookie;
 701                 cb.sc_response = findpres_cb;
 702                 pcookie.num = 0;
 703
 704                 /* preallocate storage for a full set */
 705                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 706                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 707                         op->o_tmpmemctx );
 708                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 709                 pcookie.uuids[0].bv_val = pcookie.last;
 710                 pcookie.uuids[0].bv_len = UUID_LEN;
 711                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 712                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 713                         pcookie.uuids[i].bv_len = UUID_LEN;
 714                 }
 715                 break;
 716         }
 717
 718         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 719         fop.o_bd->be_search( &fop, &frs );
 720         fop.o_bd->bd_info = (BackendInfo *)on;
 721
 722         switch( mode ) {
 723         case FIND_MAXCSN:
 724                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 725 #ifdef CHECK_CSN
 726                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 727                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 728 #endif
 729                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 730                         si->si_numops++;        /* ensure a checkpoint */
 731                 }
 732                 break;
 733         case FIND_CSN:
 734                 /* If matching CSN was not found, invalidate the context. */
 735                 if ( !cb.sc_private ) {
 736                         /* If we didn't find an exact match, then try for <= */
 737                         if ( findcsn_retry ) {
 738                                 findcsn_retry = 0;
 739                                 rs_reinit( &frs, REP_RESULT );
 740                                 goto again;
 741                         }
 742                         rc = LDAP_NO_SUCH_OBJECT;
 743                 }
 744                 break;
 745         case FIND_PRESENT:
 746                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 747                 break;
 748         }
 749
 750         return rc;
 751 }
 752
 753 /* Should find a place to cache these */
 754 static mutexint *get_mutexint()
 755 {
 756         mutexint *mi = ch_malloc( sizeof( mutexint ));
 757         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 758         mi->mi_int = 1;
 759         return mi;
 760 }
 761
 762 static void inc_mutexint( mutexint *mi )
 763 {
 764         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 765         mi->mi_int++;
 766         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 767 }
 768
 769 /* return resulting counter */
 770 static int dec_mutexint( mutexint *mi )
 771 {
 772         int i;
 773         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 774         i = --mi->mi_int;
 775         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 776         if ( !i ) {
 777                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 778                 ch_free( mi );
 779         }
 780         return i;
 781 }
 782
 783 static void
 784 syncprov_free_syncop( syncops *so )
 785 {
 786         syncres *sr, *srnext;
 787         GroupAssertion *ga, *gnext;
 788
 789         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 790         /* already being freed, or still in use */
 791         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 792                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 793                 return;
 794         }
 795         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 796         if ( so->s_flags & PS_IS_DETACHED ) {
 797                 filter_free( so->s_op->ors_filter );
 798                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 799                         gnext = ga->ga_next;
 800                         ch_free( ga );
 801                 }
 802                 ch_free( so->s_op );
 803         }
 804         ch_free( so->s_base.bv_val );
 805         for ( sr=so->s_res; sr; sr=srnext ) {
 806                 srnext = sr->s_next;
 807                 if ( sr->s_e ) {
 808                         if ( !dec_mutexint( sr->s_e->e_private )) {
 809                                 sr->s_e->e_private = NULL;
 810                                 entry_free( sr->s_e );
 811                         }
 812                 }
 813                 ch_free( sr );
 814         }
 815         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 816         ch_free( so );
 817 }
 818
 819 /* Send a persistent search response */
 820 static int
 821 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 822 {
 823         SlapReply rs = { REP_SEARCH };
 824         LDAPControl *ctrls[2];
 825         struct berval cookie, csns[2];
 826         Entry e_uuid = {0};
 827         Attribute a_uuid = {0};
 828
 829         if ( so->s_op->o_abandon )
 830                 return SLAPD_ABANDON;
 831
 832         ctrls[1] = NULL;
 833         csns[0] = opc->sctxcsn;
 834         BER_BVZERO( &csns[1] );
 835         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 836
 837 #ifdef LDAP_DEBUG
 838         if ( so->s_sid > 0 ) {
 839                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 840                         so->s_sid, cookie.bv_val, 0 );
 841         } else {
 842                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 843                         cookie.bv_val, 0, 0 );
 844         }
 845 #endif
 846
 847         e_uuid.e_attrs = &a_uuid;
 848         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 849         a_uuid.a_nvals = &opc->suuid;
 850         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 851                 mode, ctrls, 0, 1, &cookie );
 852         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 853
 854         rs.sr_ctrls = ctrls;
 855         rs.sr_entry = &e_uuid;
 856         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 857                 e_uuid = *opc->se;
 858                 e_uuid.e_private = NULL;
 859         }
 860
 861         switch( mode ) {
 862         case LDAP_SYNC_ADD:
 863                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 864                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 865                         rs.sr_err = send_search_reference( op, &rs );
 866                         ber_bvarray_free( rs.sr_ref );
 867                         break;
 868                 }
 869                 /* fallthru */
 870         case LDAP_SYNC_MODIFY:
 871                 rs.sr_attrs = op->ors_attrs;
 872                 rs.sr_err = send_search_entry( op, &rs );
 873                 break;
 874         case LDAP_SYNC_DELETE:
 875                 e_uuid.e_attrs = NULL;
 876                 e_uuid.e_name = opc->sdn;
 877                 e_uuid.e_nname = opc->sndn;
 878                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 879                         struct berval bv = BER_BVNULL;
 880                         rs.sr_ref = &bv;
 881                         rs.sr_err = send_search_reference( op, &rs );
 882                 } else {
 883                         rs.sr_err = send_search_entry( op, &rs );
 884                 }
 885                 break;
 886         default:
 887                 assert(0);
 888         }
 889         /* In case someone else freed it already? */
 890         if ( rs.sr_ctrls ) {
 891                 int i;
 892                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 893                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 894                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 895                                 ctrls[0]->ldctl_value.bv_val = NULL;
 896                                 break;
 897                         }
 898                 }
 899                 rs.sr_ctrls = NULL;
 900         }
 901
 902         return rs.sr_err;
 903 }
 904
 905 static void
 906 syncprov_qstart( syncops *so );
 907
 908 /* Play back queued responses */
 909 static int
 910 syncprov_qplay( Operation *op, syncops *so )
 911 {
 912         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 913         syncres *sr;
 914         opcookie opc;
 915         int rc = 0;
 916
 917         opc.son = on;
 918
 919         do {
 920                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 921                 sr = so->s_res;
 922                 if ( sr )
 923                         so->s_res = sr->s_next;
 924                 if ( !so->s_res )
 925                         so->s_restail = NULL;
 926                 /* Exit loop with mutex held */
 927                 if ( !sr || so->s_op->o_abandon )
 928                         break;
 929                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 930
 931                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 932                         SlapReply rs = { REP_INTERMEDIATE };
 933
 934                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 935                                 &sr->s_csn, 0, NULL, 0 );
 936                 } else {
 937                         opc.sdn = sr->s_dn;
 938                         opc.sndn = sr->s_ndn;
 939                         opc.suuid = sr->s_uuid;
 940                         opc.sctxcsn = sr->s_csn;
 941                         opc.sreference = sr->s_isreference;
 942                         opc.se = sr->s_e;
 943
 944                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 945
 946                 }
 947                 if ( sr->s_e ) {
 948                         if ( !dec_mutexint( sr->s_e->e_private )) {
 949                                 sr->s_e->e_private = NULL;
 950                                 entry_free ( sr->s_e );
 951                         }
 952                 }
 953
 954                 ch_free( sr );
 955
 956                 /* Exit loop with mutex held */
 957                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 958
 959         } while (0);
 960
 961         /* We now only send one change at a time, to prevent one
 962          * psearch from hogging all the CPU. Resubmit this task if
 963          * there are more responses queued and no errors occurred.
 964          */
 965
 966         if ( rc == 0 && so->s_res ) {
 967                 syncprov_qstart( so );
 968         } else {
 969                 so->s_flags ^= PS_TASK_QUEUED;
 970         }
 971
 972         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 973         return rc;
 974 }
 975
 976 /* task for playing back queued responses */
 977 static void *
 978 syncprov_qtask( void *ctx, void *arg )
 979 {
 980         syncops *so = arg;
 981         OperationBuffer opbuf;
 982         Operation *op;
 983         BackendDB be;
 984         int rc;
 985
 986         op = &opbuf.ob_op;
 987         *op = *so->s_op;
 988         op->o_hdr = &opbuf.ob_hdr;
 989         op->o_controls = opbuf.ob_controls;
 990         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 991         op->o_sync = SLAP_CONTROL_IGNORED;
 992
 993         *op->o_hdr = *so->s_op->o_hdr;
 994
 995         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 996         op->o_tmpmfuncs = &slap_sl_mfuncs;
 997         op->o_threadctx = ctx;
 998
 999         /* syncprov_qplay expects a fake db */
1000         be = *so->s_op->o_bd;
1001         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1002         op->o_bd = &be;
1003         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1004         op->o_callback = NULL;
1005
1006         rc = syncprov_qplay( op, so );
1007
1008         /* decrement use count... */
1009         syncprov_free_syncop( so );
1010
1011         return NULL;
1012 }
1013
1014 /* Start the task to play back queued psearch responses */
1015 static void
1016 syncprov_qstart( syncops *so )
1017 {
1018         so->s_flags |= PS_TASK_QUEUED;
1019         so->s_inuse++;
1020         ldap_pvt_thread_pool_submit( &connection_pool,
1021                 syncprov_qtask, so );
1022 }
1023
1024 /* Queue a persistent search response */
1025 static int
1026 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1027 {
1028         syncres *sr;
1029         int srsize;
1030         struct berval cookie = opc->sctxcsn;
1031
1032         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1033                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1034
1035                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1036                         so->s_rid, slap_serverID ? slap_serverID : -1);
1037         }
1038
1039         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1040                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1041         if ( cookie.bv_len )
1042                 srsize += cookie.bv_len + 1;
1043         sr = ch_malloc( srsize );
1044         sr->s_next = NULL;
1045         sr->s_e = opc->se;
1046         /* bump refcount on this entry */
1047         if ( opc->se )
1048                 inc_mutexint( opc->se->e_private );
1049         sr->s_dn.bv_val = (char *)(sr + 1);
1050         sr->s_dn.bv_len = opc->sdn.bv_len;
1051         sr->s_mode = mode;
1052         sr->s_isreference = opc->sreference;
1053         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1054                  opc->sdn.bv_val ) + 1;
1055         sr->s_ndn.bv_len = opc->sndn.bv_len;
1056         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1057                  opc->sndn.bv_val ) + 1;
1058         sr->s_uuid.bv_len = opc->suuid.bv_len;
1059         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1060         if ( cookie.bv_len ) {
1061                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1062                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1063         } else {
1064                 sr->s_csn.bv_val = NULL;
1065         }
1066         sr->s_csn.bv_len = cookie.bv_len;
1067
1068         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1069                 ch_free( cookie.bv_val );
1070         }
1071
1072         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1073         if ( !so->s_res ) {
1074                 so->s_res = sr;
1075         } else {
1076                 so->s_restail->s_next = sr;
1077         }
1078         so->s_restail = sr;
1079
1080         /* If the base of the psearch was modified, check it next time round */
1081         if ( so->s_flags & PS_WROTE_BASE ) {
1082                 so->s_flags ^= PS_WROTE_BASE;
1083                 so->s_flags |= PS_FIND_BASE;
1084         }
1085         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1086                 syncprov_qstart( so );
1087         }
1088         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1089         return LDAP_SUCCESS;
1090 }
1091
1092 static int
1093 syncprov_drop_psearch( syncops *so, int lock )
1094 {
1095         if ( so->s_flags & PS_IS_DETACHED ) {
1096                 if ( lock )
1097                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1098                 so->s_op->o_conn->c_n_ops_executing--;
1099                 so->s_op->o_conn->c_n_ops_completed++;
1100                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1101                         o_next );
1102                 if ( lock )
1103                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1104         }
1105         syncprov_free_syncop( so );
1106
1107         return 0;
1108 }
1109
1110 static int
1111 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1112 {
1113         slap_callback *sc = op->o_callback;
1114         op->o_callback = sc->sc_next;
1115         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1116         op->o_tmpfree( sc, op->o_tmpmemctx );
1117         return 0;
1118 }
1119
1120 static int
1121 syncprov_op_abandon( Operation *op, SlapReply *rs )
1122 {
1123         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1124         syncprov_info_t         *si = on->on_bi.bi_private;
1125         syncops *so, *soprev;
1126
1127         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1128         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1129                 soprev=so, so=so->s_next ) {
1130                 if ( so->s_op->o_connid == op->o_connid &&
1131                         so->s_op->o_msgid == op->orn_msgid ) {
1132                                 so->s_op->o_abandon = 1;
1133                                 soprev->s_next = so->s_next;
1134                                 break;
1135                 }
1136         }
1137         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1138         if ( so ) {
1139                 /* Is this really a Cancel exop? */
1140                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1141                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1142                         rs->sr_err = LDAP_CANCELLED;
1143                         send_ldap_result( so->s_op, rs );
1144                         if ( so->s_flags & PS_IS_DETACHED ) {
1145                                 slap_callback *cb;
1146                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1147                                 cb->sc_cleanup = syncprov_ab_cleanup;
1148                                 cb->sc_next = op->o_callback;
1149                                 cb->sc_private = so;
1150                                 return SLAP_CB_CONTINUE;
1151                         }
1152                 }
1153                 syncprov_drop_psearch( so, 0 );
1154         }
1155         return SLAP_CB_CONTINUE;
1156 }
1157
1158 /* Find which persistent searches are affected by this operation */
1159 static void
1160 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1161 {
1162         slap_overinst *on = opc->son;
1163         syncprov_info_t         *si = on->on_bi.bi_private;
1164
1165         fbase_cookie fc;
1166         syncops *ss, *sprev, *snext;
1167         Entry *e = NULL;
1168         Attribute *a;
1169         int rc;
1170         struct berval newdn;
1171         int freefdn = 0;
1172         BackendDB *b0 = op->o_bd, db;
1173
1174         fc.fdn = &op->o_req_ndn;
1175         /* compute new DN */
1176         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1177                 struct berval pdn;
1178                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1179                 else dnParent( fc.fdn, &pdn );
1180                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1181                 fc.fdn = &newdn;
1182                 freefdn = 1;
1183         }
1184         if ( op->o_tag != LDAP_REQ_ADD ) {
1185                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1186                         db = *op->o_bd;
1187                         op->o_bd = &db;
1188                 }
1189                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1190                 /* If we're sending responses now, make a copy and unlock the DB */
1191                 if ( e && !saveit ) {
1192                         if ( !opc->se ) {
1193                                 opc->se = entry_dup( e );
1194                                 opc->se->e_private = get_mutexint();
1195                         }
1196                         overlay_entry_release_ov( op, e, 0, on );
1197                         e = opc->se;
1198                 }
1199                 if ( rc ) {
1200                         op->o_bd = b0;
1201                         return;
1202                 }
1203         } else {
1204                 e = op->ora_e;
1205                 if ( !saveit ) {
1206                         if ( !opc->se ) {
1207                                 opc->se = entry_dup( e );
1208                                 opc->se->e_private = get_mutexint();
1209                         }
1210                         e = opc->se;
1211                 }
1212         }
1213
1214         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1215                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1216                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1217                 opc->sreference = is_entry_referral( e );
1218                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1219                 if ( a )
1220                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1221         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1222                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1223                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1224                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1225                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1226         }
1227
1228         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1229         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1230                 sprev = ss, ss=snext)
1231         {
1232                 Operation op2;
1233                 Opheader oh;
1234                 syncmatches *sm;
1235                 int found = 0;
1236
1237                 snext = ss->s_next;
1238                 if ( ss->s_op->o_abandon )
1239                         continue;
1240
1241                 /* Don't send ops back to the originator */
1242                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1243                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1244                                 opc->osid, 0, 0 );
1245                         continue;
1246                 }
1247
1248                 /* Don't send ops back to the messenger */
1249                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1250                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1251                                 opc->rsid, 0, 0 );
1252                         continue;
1253                 }
1254
1255                 /* validate base */
1256                 fc.fss = ss;
1257                 fc.fbase = 0;
1258                 fc.fscope = 0;
1259
1260                 /* If the base of the search is missing, signal a refresh */
1261                 rc = syncprov_findbase( op, &fc );
1262                 if ( rc != LDAP_SUCCESS ) {
1263                         SlapReply rs = {REP_RESULT};
1264                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1265                                 "search base has changed" );
1266                         sprev->s_next = snext;
1267                         syncprov_drop_psearch( ss, 1 );
1268                         ss = sprev;
1269                         continue;
1270                 }
1271
1272                 /* If we're sending results now, look for this op in old matches */
1273                 if ( !saveit ) {
1274                         syncmatches *old;
1275
1276                         /* Did we modify the search base? */
1277                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1278                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1279                                 ss->s_flags |= PS_WROTE_BASE;
1280                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1281                         }
1282
1283                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1284                                 old=sm, sm=sm->sm_next ) {
1285                                 if ( sm->sm_op == ss ) {
1286                                         found = 1;
1287                                         old->sm_next = sm->sm_next;
1288                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1289                                         break;
1290                                 }
1291                         }
1292                 }
1293
1294                 if ( fc.fscope ) {
1295                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1296                         op2 = *ss->s_op;
1297                         oh = *op->o_hdr;
1298                         oh.oh_conn = ss->s_op->o_conn;
1299                         oh.oh_connid = ss->s_op->o_connid;
1300                         op2.o_bd = op->o_bd->bd_self;
1301                         op2.o_hdr = &oh;
1302                         op2.o_extra = op->o_extra;
1303                         op2.o_callback = NULL;
1304                         if (ss->s_flags & PS_FIX_FILTER) {
1305                                 /* Skip the AND/GE clause that we stuck on in front. We
1306                                    would lose deletes/mods that happen during the refresh
1307                                    phase otherwise (ITS#6555) */
1308                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1309                         }
1310                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1311                         rc = test_filter( &op2, e, op2.ors_filter );
1312                 }
1313
1314                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1315                         ss->s_sid, fc.fscope, rc );
1316
1317                 /* check if current o_req_dn is in scope and matches filter */
1318                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1319                         if ( saveit ) {
1320                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1321                                 sm->sm_next = opc->smatches;
1322                                 sm->sm_op = ss;
1323                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1324                                 ++ss->s_inuse;
1325                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1326                                 opc->smatches = sm;
1327                         } else {
1328                                 /* if found send UPDATE else send ADD */
1329                                 syncprov_qresp( opc, ss,
1330                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1331                         }
1332                 } else if ( !saveit && found ) {
1333                         /* send DELETE */
1334                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1335                 } else if ( !saveit ) {
1336                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1337                 }
1338                 if ( !saveit && found ) {
1339                         /* Decrement s_inuse, was incremented when called
1340                          * with saveit == TRUE
1341                          */
1342                         syncprov_free_syncop( ss );
1343                 }
1344         }
1345         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1346
1347         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1348                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1349                         op->o_bd = &db;
1350                 }
1351                 if ( saveit )
1352                         overlay_entry_release_ov( op, e, 0, on );
1353                 op->o_bd = b0;
1354         }
1355         if ( opc->se && !saveit ) {
1356                 if ( !dec_mutexint( opc->se->e_private )) {
1357                         opc->se->e_private = NULL;
1358                         entry_free( opc->se );
1359                         opc->se = NULL;
1360                 }
1361         }
1362         if ( freefdn ) {
1363                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1364         }
1365         op->o_bd = b0;
1366 }
1367
1368 static int
1369 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1370 {
1371         slap_callback *cb = op->o_callback;
1372         opcookie *opc = cb->sc_private;
1373         slap_overinst *on = opc->son;
1374         syncprov_info_t         *si = on->on_bi.bi_private;
1375         syncmatches *sm, *snext;
1376         modtarget *mt;
1377
1378         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1379         if ( si->si_active )
1380                 si->si_active--;
1381         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1382
1383         for (sm = opc->smatches; sm; sm=snext) {
1384                 snext = sm->sm_next;
1385                 syncprov_free_syncop( sm->sm_op );
1386                 op->o_tmpfree( sm, op->o_tmpmemctx );
1387         }
1388
1389         /* Remove op from lock table */
1390         mt = opc->smt;
1391         if ( mt ) {
1392                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1393                 mt->mt_mods = mt->mt_mods->mi_next;
1394                 /* If there are more, promote the next one */
1395                 if ( mt->mt_mods ) {
1396                         mt->mt_op = mt->mt_mods->mi_op;
1397                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1398                 } else {
1399                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1400                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1401                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1402                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1403                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1404                         ch_free( mt );
1405                 }
1406         }
1407         if ( !BER_BVISNULL( &opc->suuid ))
1408                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1409         if ( !BER_BVISNULL( &opc->sndn ))
1410                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1411         if ( !BER_BVISNULL( &opc->sdn ))
1412                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1413         op->o_callback = cb->sc_next;
1414         op->o_tmpfree(cb, op->o_tmpmemctx);
1415
1416         return 0;
1417 }
1418
1419 static void
1420 syncprov_checkpoint( Operation *op, slap_overinst *on )
1421 {
1422         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1423         Modifications mod;
1424         Operation opm;
1425         SlapReply rsm = {REP_RESULT};
1426         slap_callback cb = {0};
1427         BackendDB be;
1428         BackendInfo *bi;
1429
1430 #ifdef CHECK_CSN
1431         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1432
1433         int i;
1434         for ( i=0; i<si->si_numcsns; i++ ) {
1435                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1436         }
1437 #endif
1438         mod.sml_numvals = si->si_numcsns;
1439         mod.sml_values = si->si_ctxcsn;
1440         mod.sml_nvalues = NULL;
1441         mod.sml_desc = slap_schema.si_ad_contextCSN;
1442         mod.sml_op = LDAP_MOD_REPLACE;
1443         mod.sml_flags = SLAP_MOD_INTERNAL;
1444         mod.sml_next = NULL;
1445
1446         cb.sc_response = slap_null_cb;
1447         opm = *op;
1448         opm.o_tag = LDAP_REQ_MODIFY;
1449         opm.o_callback = &cb;
1450         opm.orm_modlist = &mod;
1451         opm.orm_no_opattrs = 1;
1452         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1453                 be = *on->on_info->oi_origdb;
1454                 opm.o_bd = &be;
1455         }
1456         opm.o_req_dn = si->si_contextdn;
1457         opm.o_req_ndn = si->si_contextdn;
1458         bi = opm.o_bd->bd_info;
1459         opm.o_bd->bd_info = on->on_info->oi_orig;
1460         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1461         opm.o_no_schema_check = 1;
1462         opm.o_bd->be_modify( &opm, &rsm );
1463
1464         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1465                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1466                 const char      *text;
1467                 char txtbuf[SLAP_TEXT_BUFLEN];
1468                 size_t textlen = sizeof txtbuf;
1469                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1470                 rs_reinit( &rsm, REP_RESULT );
1471                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1472                 opm.ora_e = e;
1473                 opm.o_bd->be_add( &opm, &rsm );
1474                 if ( e == opm.ora_e )
1475                         be_entry_release_w( &opm, opm.ora_e );
1476         }
1477         opm.o_bd->bd_info = bi;
1478
1479         if ( mod.sml_next != NULL ) {
1480                 slap_mods_free( mod.sml_next, 1 );
1481         }
1482 #ifdef CHECK_CSN
1483         for ( i=0; i<si->si_numcsns; i++ ) {
1484                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1485         }
1486 #endif
1487 }
1488
1489 static void
1490 syncprov_add_slog( Operation *op )
1491 {
1492         opcookie *opc = op->o_callback->sc_private;
1493         slap_overinst *on = opc->son;
1494         syncprov_info_t         *si = on->on_bi.bi_private;
1495         sessionlog *sl;
1496         slog_entry *se;
1497
1498         sl = si->si_logs;
1499         {
1500                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1501                         /* During the syncrepl refresh phase we can receive operations
1502                          * without a csn.  We cannot reliably determine the consumers
1503                          * state with respect to such operations, so we ignore them and
1504                          * wipe out anything in the log if we see them.
1505                          */
1506                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1507                         while ( se = sl->sl_head ) {
1508                                 sl->sl_head = se->se_next;
1509                                 ch_free( se );
1510                         }
1511                         sl->sl_tail = NULL;
1512                         sl->sl_num = 0;
1513                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1514                         return;
1515                 }
1516
1517                 /* Allocate a record. UUIDs are not NUL-terminated. */
1518                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1519                         op->o_csn.bv_len + 1 );
1520                 se->se_next = NULL;
1521                 se->se_tag = op->o_tag;
1522
1523                 se->se_uuid.bv_val = (char *)(&se[1]);
1524                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1525                 se->se_uuid.bv_len = opc->suuid.bv_len;
1526
1527                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1528                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1529                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1530                 se->se_csn.bv_len = op->o_csn.bv_len;
1531                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1532
1533                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1534                 if ( sl->sl_head ) {
1535                         /* Keep the list in csn order. */
1536                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1537                                 sl->sl_tail->se_next = se;
1538                                 sl->sl_tail = se;
1539                         } else {
1540                                 slog_entry **sep;
1541
1542                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1543                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1544                                                 se->se_next = *sep;
1545                                                 *sep = se;
1546                                                 break;
1547                                         }
1548                                 }
1549                         }
1550                 } else {
1551                         sl->sl_head = se;
1552                         sl->sl_tail = se;
1553                         if ( !sl->sl_mincsn ) {
1554                                 sl->sl_numcsns = 1;
1555                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1556                                 sl->sl_sids = ch_malloc( sizeof( int ));
1557                                 sl->sl_sids[0] = se->se_sid;
1558                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1559                                 BER_BVZERO( &sl->sl_mincsn[1] );
1560                         }
1561                 }
1562                 sl->sl_num++;
1563                 while ( sl->sl_num > sl->sl_size ) {
1564                         int i, j;
1565                         se = sl->sl_head;
1566                         sl->sl_head = se->se_next;
1567                         for ( i=0; i<sl->sl_numcsns; i++ )
1568                                 if ( sl->sl_sids[i] >= se->se_sid )
1569                                         break;
1570                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1571                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1572                                         i, se->se_sid, &se->se_csn );
1573                         } else {
1574                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1575                         }
1576                         ch_free( se );
1577                         sl->sl_num--;
1578                 }
1579                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1580         }
1581 }
1582
1583 /* Just set a flag if we found the matching entry */
1584 static int
1585 playlog_cb( Operation *op, SlapReply *rs )
1586 {
1587         if ( rs->sr_type == REP_SEARCH ) {
1588                 op->o_callback->sc_private = (void *)1;
1589         }
1590         return rs->sr_err;
1591 }
1592
1593 /* enter with sl->sl_mutex locked, release before returning */
1594 static void
1595 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1596         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1597 {
1598         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1599         slog_entry *se;
1600         int i, j, ndel, num, nmods, mmods;
1601         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1602         BerVarray uuids;
1603         struct berval delcsn[2];
1604
1605         if ( !sl->sl_num ) {
1606                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1607                 return;
1608         }
1609
1610         num = sl->sl_num;
1611         i = 0;
1612         nmods = 0;
1613
1614         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1615                 num * UUID_LEN, op->o_tmpmemctx );
1616         uuids[0].bv_val = (char *)(uuids + num + 1);
1617
1618         delcsn[0].bv_len = 0;
1619         delcsn[0].bv_val = cbuf;
1620         BER_BVZERO(&delcsn[1]);
1621
1622         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1623          * and everything else at the end. Do this first so we can
1624          * unlock the list mutex.
1625          */
1626         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1627                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1628         for ( se=sl->sl_head; se; se=se->se_next ) {
1629                 int k;
1630                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1631                 ndel = 1;
1632                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1633                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1634                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1635                                 break;
1636                         }
1637                 }
1638                 if ( ndel <= 0 ) {
1639                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1640                         continue;
1641                 }
1642                 ndel = 0;
1643                 for ( k=0; k<numcsns; k++ ) {
1644                         if ( se->se_sid == sids[k] ) {
1645                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1646                                 break;
1647                         }
1648                 }
1649                 if ( ndel > 0 ) {
1650                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1651                         break;
1652                 }
1653                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1654                         j = i;
1655                         i++;
1656                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1657                         delcsn[0].bv_len = se->se_csn.bv_len;
1658                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1659                 } else {
1660                         if ( se->se_tag == LDAP_REQ_ADD )
1661                                 continue;
1662                         nmods++;
1663                         j = num - nmods;
1664                 }
1665                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1666                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1667                 uuids[j].bv_len = UUID_LEN;
1668         }
1669         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1670
1671         ndel = i;
1672
1673         /* Zero out unused slots */
1674         for ( i=ndel; i < num - nmods; i++ )
1675                 uuids[i].bv_len = 0;
1676
1677         /* Mods must be validated to see if they belong in this delete set.
1678          */
1679
1680         mmods = nmods;
1681         /* Strip any duplicates */
1682         for ( i=0; i<nmods; i++ ) {
1683                 for ( j=0; j<ndel; j++ ) {
1684                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1685                                 uuids[num - 1 - i].bv_len = 0;
1686                                 mmods --;
1687                                 break;
1688                         }
1689                 }
1690                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1691                 for ( j=0; j<i; j++ ) {
1692                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1693                                 uuids[num - 1 - i].bv_len = 0;
1694                                 mmods --;
1695                                 break;
1696                         }
1697                 }
1698         }
1699
1700         if ( mmods ) {
1701                 Operation fop;
1702                 int rc;
1703                 Filter mf, af;
1704                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1705                 slap_callback cb = {0};
1706
1707                 fop = *op;
1708
1709                 fop.o_sync_mode = 0;
1710                 fop.o_callback = &cb;
1711                 fop.ors_limit = NULL;
1712                 fop.ors_tlimit = SLAP_NO_LIMIT;
1713                 fop.ors_attrs = slap_anlist_all_attributes;
1714                 fop.ors_attrsonly = 0;
1715                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1716
1717                 af.f_choice = LDAP_FILTER_AND;
1718                 af.f_next = NULL;
1719                 af.f_and = &mf;
1720                 mf.f_choice = LDAP_FILTER_EQUALITY;
1721                 mf.f_ava = &eq;
1722                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1723                 mf.f_next = fop.ors_filter;
1724
1725                 fop.ors_filter = &af;
1726
1727                 cb.sc_response = playlog_cb;
1728                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1729
1730                 for ( i=ndel; i<num; i++ ) {
1731                   if ( uuids[i].bv_len != 0 ) {
1732                         SlapReply frs = { REP_RESULT };
1733
1734                         mf.f_av_value = uuids[i];
1735                         cb.sc_private = NULL;
1736                         fop.ors_slimit = 1;
1737                         rc = fop.o_bd->be_search( &fop, &frs );
1738
1739                         /* If entry was not found, add to delete list */
1740                         if ( !cb.sc_private ) {
1741                                 uuids[ndel++] = uuids[i];
1742                         }
1743                   }
1744                 }
1745                 fop.o_bd->bd_info = (BackendInfo *)on;
1746         }
1747         if ( ndel ) {
1748                 struct berval cookie;
1749
1750                 if ( delcsn[0].bv_len ) {
1751                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1752                                 slap_serverID ? slap_serverID : -1 );
1753
1754                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1755                 }
1756
1757                 uuids[ndel].bv_val = NULL;
1758                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1759                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1760                 if ( delcsn[0].bv_len ) {
1761                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1762                 }
1763         }
1764         op->o_tmpfree( uuids, op->o_tmpmemctx );
1765 }
1766
1767 static int
1768 syncprov_op_response( Operation *op, SlapReply *rs )
1769 {
1770         opcookie *opc = op->o_callback->sc_private;
1771         slap_overinst *on = opc->son;
1772         syncprov_info_t         *si = on->on_bi.bi_private;
1773         syncmatches *sm;
1774
1775         if ( rs->sr_err == LDAP_SUCCESS )
1776         {
1777                 struct berval maxcsn;
1778                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1779                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1780
1781                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1782
1783                 /* Update our context CSN */
1784                 cbuf[0] = '\0';
1785                 maxcsn.bv_val = cbuf;
1786                 maxcsn.bv_len = sizeof(cbuf);
1787                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1788
1789                 slap_get_commit_csn( op, &maxcsn, &foundit );
1790                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1791                         /* syncrepl queues the CSN values in the db where
1792                          * it is configured , not where the changes are made.
1793                          * So look for a value in the glue db if we didn't
1794                          * find any in this db.
1795                          */
1796                         BackendDB *be = op->o_bd;
1797                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1798                         maxcsn.bv_val = cbuf;
1799                         maxcsn.bv_len = sizeof(cbuf);
1800                         slap_get_commit_csn( op, &maxcsn, &foundit );
1801                         op->o_bd = be;
1802                 }
1803                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1804                         int i, sid;
1805 #ifdef CHECK_CSN
1806                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1807                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1808 #endif
1809                         sid = slap_parse_csn_sid( &maxcsn );
1810                         for ( i=0; i<si->si_numcsns; i++ ) {
1811                                 if ( sid < si->si_sids[i] )
1812                                         break;
1813                                 if ( sid == si->si_sids[i] ) {
1814                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1815                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1816                                                 csn_changed = 1;
1817                                         }
1818                                         break;
1819                                 }
1820                         }
1821                         /* It's a new SID for us */
1822                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1823                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1824                                         i, sid, &maxcsn );
1825                                 csn_changed = 1;
1826                         }
1827                 }
1828
1829                 /* Don't do any processing for consumer contextCSN updates */
1830                 if ( op->o_dont_replicate ) {
1831                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1832                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1833                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1834                         /* Catch contextCSN updates from syncrepl. We have to look at
1835                          * all the attribute values, as there may be more than one csn
1836                          * that changed, and only one can be passed in the csn queue.
1837                          */
1838                         Modifications *mod = op->orm_modlist;
1839                         unsigned i;
1840                         int j, sid;
1841
1842                         for ( i=0; i<mod->sml_numvals; i++ ) {
1843                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1844                                 for ( j=0; j<si->si_numcsns; j++ ) {
1845                                         if ( sid < si->si_sids[j] )
1846                                                 break;
1847                                         if ( sid == si->si_sids[j] ) {
1848                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1849                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1850                                                         csn_changed = 1;
1851                                                 }
1852                                                 break;
1853                                         }
1854                                 }
1855
1856                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1857                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1858                                                 j, sid, &mod->sml_values[i] );
1859                                         csn_changed = 1;
1860                                 }
1861                         }
1862                         if ( csn_changed )
1863                                 si->si_dirty = 0;
1864                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1865
1866                         if ( csn_changed ) {
1867                                 syncops *ss;
1868                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1869                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1870                                         if ( ss->s_op->o_abandon )
1871                                                 continue;
1872                                         /* Send the updated csn to all syncrepl consumers,
1873                                          * including the server from which it originated.
1874                                          * The syncrepl consumer and syncprov provider on
1875                                          * the originating server may be configured to store
1876                                          * their csn values in different entries.
1877                                          */
1878                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1879                                 }
1880                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1881                         }
1882                         } else {
1883                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1884                         }
1885                         goto leave;
1886                 }
1887
1888                 si->si_numops++;
1889                 if ( si->si_chkops || si->si_chktime ) {
1890                         /* Never checkpoint adding the context entry,
1891                          * it will deadlock
1892                          */
1893                         if ( op->o_tag != LDAP_REQ_ADD ||
1894                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1895                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1896                                         do_check = 1;
1897                                         si->si_numops = 0;
1898                                 }
1899                                 if ( si->si_chktime &&
1900                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1901                                         if ( si->si_chklast ) {
1902                                                 do_check = 1;
1903                                                 si->si_chklast = op->o_time;
1904                                         } else {
1905                                                 si->si_chklast = 1;
1906                                         }
1907                                 }
1908                         }
1909                 }
1910                 si->si_dirty = !csn_changed;
1911                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1912
1913                 if ( do_check ) {
1914                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1915                         syncprov_checkpoint( op, on );
1916                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1917                 }
1918
1919                 /* only update consumer ctx if this is a newer csn */
1920                 if ( csn_changed ) {
1921                         opc->sctxcsn = maxcsn;
1922                 }
1923
1924                 /* Handle any persistent searches */
1925                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1926                 have_psearches = ( si->si_ops != NULL );
1927                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1928                 if ( have_psearches ) {
1929                         switch(op->o_tag) {
1930                         case LDAP_REQ_ADD:
1931                         case LDAP_REQ_MODIFY:
1932                         case LDAP_REQ_MODRDN:
1933                         case LDAP_REQ_EXTENDED:
1934                                 syncprov_matchops( op, opc, 0 );
1935                                 break;
1936                         case LDAP_REQ_DELETE:
1937                                 /* for each match in opc->smatches:
1938                                  *   send DELETE msg
1939                                  */
1940                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1941                                         if ( sm->sm_op->s_op->o_abandon )
1942                                                 continue;
1943                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1944                                 }
1945                                 break;
1946                         }
1947                 }
1948
1949                 /* Add any log records */
1950                 if ( si->si_logs ) {
1951                         syncprov_add_slog( op );
1952                 }
1953 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1954         }
1955         return SLAP_CB_CONTINUE;
1956 }
1957
1958 /* We don't use a subentry to store the context CSN any more.
1959  * We expose the current context CSN as an operational attribute
1960  * of the suffix entry.
1961  */
1962 static int
1963 syncprov_op_compare( Operation *op, SlapReply *rs )
1964 {
1965         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1966         syncprov_info_t         *si = on->on_bi.bi_private;
1967         int rc = SLAP_CB_CONTINUE;
1968
1969         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1970                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1971         {
1972                 Entry e = {0};
1973                 Attribute a = {0};
1974
1975                 e.e_name = si->si_contextdn;
1976                 e.e_nname = si->si_contextdn;
1977                 e.e_attrs = &a;
1978
1979                 a.a_desc = slap_schema.si_ad_contextCSN;
1980
1981                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1982
1983                 a.a_vals = si->si_ctxcsn;
1984                 a.a_nvals = a.a_vals;
1985                 a.a_numvals = si->si_numcsns;
1986
1987                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1988                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1989                 if ( ! rs->sr_err ) {
1990                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1991                         goto return_results;
1992                 }
1993
1994                 if ( get_assert( op ) &&
1995                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1996                 {
1997                         rs->sr_err = LDAP_ASSERTION_FAILED;
1998                         goto return_results;
1999                 }
2000
2001
2002                 rs->sr_err = LDAP_COMPARE_FALSE;
2003
2004                 if ( attr_valfind( &a,
2005                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2006                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2007                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2008                 {
2009                         rs->sr_err = LDAP_COMPARE_TRUE;
2010                 }
2011
2012 return_results:;
2013
2014                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2015
2016                 send_ldap_result( op, rs );
2017
2018                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2019                         rs->sr_err = LDAP_SUCCESS;
2020                 }
2021                 rc = rs->sr_err;
2022         }
2023
2024         return rc;
2025 }
2026
2027 static int
2028 syncprov_op_mod( Operation *op, SlapReply *rs )
2029 {
2030         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2031         syncprov_info_t         *si = on->on_bi.bi_private;
2032         slap_callback *cb;
2033         opcookie *opc;
2034         int have_psearches, cbsize;
2035
2036         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2037         have_psearches = ( si->si_ops != NULL );
2038         si->si_active++;
2039         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2040
2041         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2042                 (have_psearches ? sizeof(modinst) : 0 );
2043
2044         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2045         opc = (opcookie *)(cb+1);
2046         opc->son = on;
2047         cb->sc_response = syncprov_op_response;
2048         cb->sc_cleanup = syncprov_op_cleanup;
2049         cb->sc_private = opc;
2050         cb->sc_next = op->o_callback;
2051         op->o_callback = cb;
2052
2053         opc->osid = -1;
2054         opc->rsid = -1;
2055         if ( op->o_csn.bv_val ) {
2056                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2057         }
2058         if ( op->o_controls ) {
2059                 struct sync_cookie *scook =
2060                 op->o_controls[slap_cids.sc_LDAPsync];
2061                 if ( scook )
2062                         opc->rsid = scook->sid;
2063         }
2064
2065         if ( op->o_dont_replicate )
2066                 return SLAP_CB_CONTINUE;
2067
2068         /* If there are active persistent searches, lock this operation.
2069          * See seqmod.c for the locking logic on its own.
2070          */
2071         if ( have_psearches ) {
2072                 modtarget *mt, mtdummy;
2073                 modinst *mi;
2074
2075                 mi = (modinst *)(opc+1);
2076                 mi->mi_op = op;
2077
2078                 /* See if we're already modifying this entry... */
2079                 mtdummy.mt_op = op;
2080                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2081                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2082                 if ( mt ) {
2083                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2084                         if ( mt->mt_mods == NULL ) {
2085                                 /* Cannot reuse this mt, as another thread is about
2086                                  * to release it in syncprov_op_cleanup.
2087                                  */
2088                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2089                                 mt = NULL;
2090                         }
2091                 }
2092                 if ( mt ) {
2093                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2094                         mt->mt_tail->mi_next = mi;
2095                         mt->mt_tail = mi;
2096                         /* wait for this op to get to head of list */
2097                         while ( mt->mt_mods != mi ) {
2098                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2099                                 /* FIXME: if dynamic config can delete overlays or
2100                                  * databases we'll have to check for cleanup here.
2101                                  * Currently it's not an issue because there are
2102                                  * no dynamic config deletes...
2103                                  */
2104                                 if ( slapd_shutdown )
2105                                         return SLAPD_ABANDON;
2106
2107                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2108                                         ldap_pvt_thread_yield();
2109                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2110
2111                                 /* clean up if the caller is giving up */
2112                                 if ( op->o_abandon ) {
2113                                         modinst *m2;
2114                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2115                                                 m2 = m2->mi_next );
2116                                         if ( m2 ) {
2117                                                 m2->mi_next = mi->mi_next;
2118                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2119                                         }
2120                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2121                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2122                                         return SLAPD_ABANDON;
2123                                 }
2124                         }
2125                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2126                 } else {
2127                         /* Record that we're modifying this entry now */
2128                         mt = ch_malloc( sizeof(modtarget) );
2129                         mt->mt_mods = mi;
2130                         mt->mt_tail = mi;
2131                         mt->mt_op = mi->mi_op;
2132                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2133                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2134                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2135                 }
2136                 opc->smt = mt;
2137         }
2138
2139         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2140                 syncprov_matchops( op, opc, 1 );
2141
2142         return SLAP_CB_CONTINUE;
2143 }
2144
2145 static int
2146 syncprov_op_extended( Operation *op, SlapReply *rs )
2147 {
2148         if ( exop_is_write( op ))
2149                 return syncprov_op_mod( op, rs );
2150
2151         return SLAP_CB_CONTINUE;
2152 }
2153
2154 typedef struct searchstate {
2155         slap_overinst *ss_on;
2156         syncops *ss_so;
2157         BerVarray ss_ctxcsn;
2158         int *ss_sids;
2159         int ss_numcsns;
2160 #define SS_PRESENT      0x01
2161 #define SS_CHANGED      0x02
2162         int ss_flags;
2163 } searchstate;
2164
2165 static int
2166 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2167 {
2168         if ( rs->sr_ctrls ) {
2169                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2170                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2171                 rs->sr_ctrls = NULL;
2172         }
2173         return 0;
2174 }
2175
2176 typedef struct SyncOperationBuffer {
2177         Operation               sob_op;
2178         Opheader                sob_hdr;
2179         OpExtra                 sob_oe;
2180         AttributeName   sob_extra;      /* not always present */
2181         /* Further data allocated here */
2182 } SyncOperationBuffer;
2183
2184 static void
2185 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2186 {
2187         SyncOperationBuffer *sopbuf2;
2188         Operation *op2;
2189         int i, alen = 0;
2190         size_t size;
2191         char *ptr;
2192         GroupAssertion *g1, *g2;
2193
2194         /* count the search attrs */
2195         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2196                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2197         }
2198         /* Make a new copy of the operation */
2199         size = offsetof( SyncOperationBuffer, sob_extra ) +
2200                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2201                 op->o_req_dn.bv_len + 1 +
2202                 op->o_req_ndn.bv_len + 1 +
2203                 op->o_ndn.bv_len + 1 +
2204                 so->s_filterstr.bv_len + 1;
2205         sopbuf2 = ch_calloc( 1, size );
2206         op2 = &sopbuf2->sob_op;
2207         op2->o_hdr = &sopbuf2->sob_hdr;
2208         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2209
2210         /* Copy the fields we care about explicitly, leave the rest alone */
2211         *op2->o_hdr = *op->o_hdr;
2212         op2->o_tag = op->o_tag;
2213         op2->o_time = op->o_time;
2214         op2->o_bd = on->on_info->oi_origdb;
2215         op2->o_request = op->o_request;
2216         op2->o_managedsait = op->o_managedsait;
2217         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2218         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2219
2220         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2221         if ( i ) {
2222                 op2->ors_attrs = (AttributeName *) ptr;
2223                 ptr = (char *) &op2->ors_attrs[i+1];
2224                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2225                         op2->ors_attrs[i] = op->ors_attrs[i];
2226                         op2->ors_attrs[i].an_name.bv_val = ptr;
2227                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2228                 }
2229                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2230         }
2231
2232         op2->o_authz = op->o_authz;
2233         op2->o_ndn.bv_val = ptr;
2234         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2235         op2->o_dn = op2->o_ndn;
2236         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2237         op2->o_req_dn.bv_val = ptr;
2238         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2239         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2240         op2->o_req_ndn.bv_val = ptr;
2241         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2242         op2->ors_filterstr.bv_val = ptr;
2243         strcpy( ptr, so->s_filterstr.bv_val );
2244         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2245
2246         /* Skip the AND/GE clause that we stuck on in front */
2247         if ( so->s_flags & PS_FIX_FILTER ) {
2248                 op2->ors_filter = op->ors_filter->f_and->f_next;
2249                 so->s_flags ^= PS_FIX_FILTER;
2250         } else {
2251                 op2->ors_filter = op->ors_filter;
2252         }
2253         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2254         so->s_op = op2;
2255
2256         /* Copy any cached group ACLs individually */
2257         op2->o_groups = NULL;
2258         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2259                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2260                 *g2 = *g1;
2261                 strcpy( g2->ga_ndn, g1->ga_ndn );
2262                 g2->ga_next = op2->o_groups;
2263                 op2->o_groups = g2;
2264         }
2265         /* Don't allow any further group caching */
2266         op2->o_do_not_cache = 1;
2267
2268         /* Add op2 to conn so abandon will find us */
2269         op->o_conn->c_n_ops_executing++;
2270         op->o_conn->c_n_ops_completed--;
2271         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2272         so->s_flags |= PS_IS_DETACHED;
2273
2274         /* Prevent anyone else from trying to send a result for this op */
2275         op->o_abandon = 1;
2276 }
2277
2278 static int
2279 syncprov_search_response( Operation *op, SlapReply *rs )
2280 {
2281         searchstate *ss = op->o_callback->sc_private;
2282         slap_overinst *on = ss->ss_on;
2283         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2284         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2285
2286         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2287                 Attribute *a;
2288                 /* If we got a referral without a referral object, there's
2289                  * something missing that we cannot replicate. Just ignore it.
2290                  * The consumer will abort because we didn't send the expected
2291                  * control.
2292                  */
2293                 if ( !rs->sr_entry ) {
2294                         assert( rs->sr_entry != NULL );
2295                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2296                         return SLAP_CB_CONTINUE;
2297                 }
2298                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2299                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2300                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2301                 }
2302                 if ( a ) {
2303                         int i, sid;
2304                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2305
2306                         /* Don't send changed entries back to the originator */
2307                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2308                                 Debug( LDAP_DEBUG_SYNC,
2309                                         "Entry %s changed by peer, ignored\n",
2310                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2311                                 return LDAP_SUCCESS;
2312                         }
2313
2314                         /* If not a persistent search */
2315                         if ( !ss->ss_so ) {
2316                                 /* Make sure entry is less than the snapshot'd contextCSN */
2317                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2318                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2319                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2320                                                 Debug( LDAP_DEBUG_SYNC,
2321                                                         "Entry %s CSN %s greater than snapshot %s\n",
2322                                                         rs->sr_entry->e_name.bv_val,
2323                                                         a->a_nvals[0].bv_val,
2324                                                         ss->ss_ctxcsn[i].bv_val );
2325                                                 return LDAP_SUCCESS;
2326                                         }
2327                                 }
2328                         }
2329
2330                         /* Don't send old entries twice */
2331                         if ( srs->sr_state.ctxcsn ) {
2332                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2333                                         if ( sid == srs->sr_state.sids[i] &&
2334                                                 ber_bvcmp( &a->a_nvals[0],
2335                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2336                                                 Debug( LDAP_DEBUG_SYNC,
2337                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2338                                                         rs->sr_entry->e_name.bv_val,
2339                                                         a->a_nvals[0].bv_val,
2340                                                         srs->sr_state.ctxcsn[i].bv_val );
2341                                                 return LDAP_SUCCESS;
2342                                         }
2343                                 }
2344                         }
2345                 }
2346                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2347                         op->o_tmpmemctx );
2348                 rs->sr_ctrls[1] = NULL;
2349                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2350                 /* If we're in delta-sync mode, always send a cookie */
2351                 if ( si->si_nopres && si->si_usehint && a ) {
2352                         struct berval cookie;
2353                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2354                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2355                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2356                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2357                 } else {
2358                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2359                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2360                 }
2361         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2362                 struct berval cookie = BER_BVNULL;
2363
2364                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2365                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2366                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2367                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2368
2369                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2370                 }
2371
2372                 /* Is this a regular refresh?
2373                  * Note: refresh never gets here if there were no changes
2374                  */
2375                 if ( !ss->ss_so ) {
2376                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2377                                 op->o_tmpmemctx );
2378                         rs->sr_ctrls[1] = NULL;
2379                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2380                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2381                                         LDAP_SYNC_REFRESH_DELETES );
2382                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2383                 } else {
2384                 /* It's RefreshAndPersist, transition to Persist phase */
2385                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2386                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2387                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2388                                 1, NULL, 0 );
2389                         if ( !BER_BVISNULL( &cookie ))
2390                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2391
2392                         /* Detach this Op from frontend control */
2393                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2394
2395                         /* But not if this connection was closed along the way */
2396                         if ( op->o_abandon ) {
2397                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2398                                 /* syncprov_ab_cleanup will free this syncop */
2399                                 return SLAPD_ABANDON;
2400
2401                         } else {
2402                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2403                                 /* Turn off the refreshing flag */
2404                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2405
2406                                 syncprov_detach_op( op, ss->ss_so, on );
2407
2408                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2409
2410                                 /* If there are queued responses, fire them off */
2411                                 if ( ss->ss_so->s_res )
2412                                         syncprov_qstart( ss->ss_so );
2413                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2414                         }
2415
2416                         return LDAP_SUCCESS;
2417                 }
2418         }
2419
2420         return SLAP_CB_CONTINUE;
2421 }
2422
2423 static int
2424 syncprov_op_search( Operation *op, SlapReply *rs )
2425 {
2426         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2427         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2428         slap_callback   *cb;
2429         int gotstate = 0, changed = 0, do_present = 0;
2430         syncops *sop = NULL;
2431         searchstate *ss;
2432         sync_control *srs;
2433         BerVarray ctxcsn;
2434         int i, *sids, numcsns;
2435         struct berval mincsn, maxcsn;
2436         int minsid, maxsid;
2437         int dirty = 0;
2438
2439         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2440
2441         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2442                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2443                 return rs->sr_err;
2444         }
2445
2446         srs = op->o_controls[slap_cids.sc_LDAPsync];
2447
2448         /* If this is a persistent search, set it up right away */
2449         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2450                 syncops so = {0};
2451                 fbase_cookie fc;
2452                 opcookie opc;
2453                 slap_callback sc;
2454
2455                 fc.fss = &so;
2456                 fc.fbase = 0;
2457                 so.s_eid = NOID;
2458                 so.s_op = op;
2459                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2460                 /* syncprov_findbase expects to be called as a callback... */
2461                 sc.sc_private = &opc;
2462                 opc.son = on;
2463                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2464                 cb = op->o_callback;
2465                 op->o_callback = &sc;
2466                 rs->sr_err = syncprov_findbase( op, &fc );
2467                 op->o_callback = cb;
2468                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2469
2470                 if ( rs->sr_err != LDAP_SUCCESS ) {
2471                         send_ldap_result( op, rs );
2472                         return rs->sr_err;
2473                 }
2474                 sop = ch_malloc( sizeof( syncops ));
2475                 *sop = so;
2476                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2477                 sop->s_rid = srs->sr_state.rid;
2478                 sop->s_sid = srs->sr_state.sid;
2479                 /* set refcount=2 to prevent being freed out from under us
2480                  * by abandons that occur while we're running here
2481                  */
2482                 sop->s_inuse = 2;
2483
2484                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2485                 while ( si->si_active ) {
2486                         /* Wait for active mods to finish before proceeding, as they
2487                          * may already have inspected the si_ops list looking for
2488                          * consumers to replicate the change to.  Using the log
2489                          * doesn't help, as we may finish playing it before the
2490                          * active mods gets added to it.
2491                          */
2492                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2493                         if ( slapd_shutdown )
2494                                 return SLAPD_ABANDON;
2495                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2496                                 ldap_pvt_thread_yield();
2497                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2498                 }
2499                 sop->s_next = si->si_ops;
2500                 si->si_ops = sop;
2501                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2502         }
2503
2504         /* snapshot the ctxcsn */
2505         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2506         numcsns = si->si_numcsns;
2507         if ( numcsns ) {
2508                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2509                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2510                 for ( i=0; i<numcsns; i++ )
2511                         sids[i] = si->si_sids[i];
2512         } else {
2513                 ctxcsn = NULL;
2514                 sids = NULL;
2515         }
2516         dirty = si->si_dirty;
2517         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2518
2519         /* If we have a cookie, handle the PRESENT lookups */
2520         if ( srs->sr_state.ctxcsn ) {
2521                 sessionlog *sl;
2522                 int i, j;
2523
2524                 /* If we don't have any CSN of our own yet, pretend nothing
2525                  * has changed.
2526                  */
2527                 if ( !numcsns )
2528                         goto no_change;
2529
2530                 if ( !si->si_nopres )
2531                         do_present = SS_PRESENT;
2532
2533                 /* If there are SIDs we don't recognize in the cookie, drop them */
2534                 for (i=0; i<srs->sr_state.numcsns; ) {
2535                         for (j=i; j<numcsns; j++) {
2536                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2537                                         break;
2538                                 }
2539                         }
2540                         /* not found */
2541                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2542                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2543                                 srs->sr_state.numcsns--;
2544                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2545                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2546                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2547                                 }
2548                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2549                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2550                                 continue;
2551                         }
2552                         i++;
2553                 }
2554
2555                 if (srs->sr_state.numcsns != numcsns) {
2556                         /* consumer doesn't have the right number of CSNs */
2557                         changed = SS_CHANGED;
2558                         if ( srs->sr_state.ctxcsn ) {
2559                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2560                                 srs->sr_state.ctxcsn = NULL;
2561                         }
2562                         if ( srs->sr_state.sids ) {
2563                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2564                                 srs->sr_state.sids = NULL;
2565                         }
2566                         srs->sr_state.numcsns = 0;
2567                         goto shortcut;
2568                 }
2569
2570                 /* Find the smallest CSN which differs from contextCSN */
2571                 mincsn.bv_len = 0;
2572                 maxcsn.bv_len = 0;
2573                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2574                         int newer;
2575                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2576                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2577                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2578                                 maxcsn = srs->sr_state.ctxcsn[i];
2579                                 maxsid = sids[j];
2580                         }
2581                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2582                         /* If our state is newer, tell consumer about changes */
2583                         if ( newer < 0) {
2584                                 changed = SS_CHANGED;
2585                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2586                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2587                                         mincsn = srs->sr_state.ctxcsn[i];
2588                                         minsid = sids[j];
2589                                 }
2590                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2591                         /* our state is older, complain to consumer */
2592                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2593                                 rs->sr_text = "consumer state is newer than provider!";
2594 bailout:
2595                                 if ( sop ) {
2596                                         syncops **sp = &si->si_ops;
2597
2598                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2599                                         while ( *sp != sop )
2600                                                 sp = &(*sp)->s_next;
2601                                         *sp = sop->s_next;
2602                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2603                                         ch_free( sop );
2604                                 }
2605                                 rs->sr_ctrls = NULL;
2606                                 send_ldap_result( op, rs );
2607                                 return rs->sr_err;
2608                         }
2609                 }
2610                 if ( BER_BVISEMPTY( &mincsn )) {
2611                         mincsn = maxcsn;
2612                         minsid = maxsid;
2613                 }
2614
2615                 /* If nothing has changed, shortcut it */
2616                 if ( !changed && !dirty ) {
2617                         do_present = 0;
2618 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2619                                 LDAPControl     *ctrls[2];
2620
2621                                 ctrls[0] = NULL;
2622                                 ctrls[1] = NULL;
2623                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2624                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2625                                 rs->sr_ctrls = ctrls;
2626                                 rs->sr_err = LDAP_SUCCESS;
2627                                 send_ldap_result( op, rs );
2628                                 rs->sr_ctrls = NULL;
2629                                 return rs->sr_err;
2630                         }
2631                         goto shortcut;
2632                 }
2633
2634                 /* Do we have a sessionlog for this search? */
2635                 sl=si->si_logs;
2636                 if ( sl ) {
2637                         int do_play = 0;
2638                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2639                         /* Are there any log entries, and is the consumer state
2640                          * present in the session log?
2641                          */
2642                         if ( sl->sl_num > 0 ) {
2643                                 int i;
2644                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2645                                         /* SID not present == new enough */
2646                                         if ( minsid < sl->sl_sids[i] ) {
2647                                                 do_play = 1;
2648                                                 break;
2649                                         }
2650                                         /* SID present */
2651                                         if ( minsid == sl->sl_sids[i] ) {
2652                                                 /* new enough? */
2653                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2654                                                         do_play = 1;
2655                                                 break;
2656                                         }
2657                                 }
2658                                 /* SID not present == new enough */
2659                                 if ( i == sl->sl_numcsns )
2660                                         do_play = 1;
2661                         }
2662                         if ( do_play ) {
2663                                 do_present = 0;
2664                                 /* mutex is unlocked in playlog */
2665                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2666                         } else {
2667                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2668                         }
2669                 }
2670                 /* Is the CSN still present in the database? */
2671                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2672                         /* No, so a reload is required */
2673                         /* the 2.2 consumer doesn't send this hint */
2674                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2675                                 if ( ctxcsn )
2676                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2677                                 if ( sids )
2678                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2679                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2680                                 rs->sr_text = "sync cookie is stale";
2681                                 goto bailout;
2682                         }
2683                         if ( srs->sr_state.ctxcsn ) {
2684                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2685                                 srs->sr_state.ctxcsn = NULL;
2686                         }
2687                         if ( srs->sr_state.sids ) {
2688                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2689                                 srs->sr_state.sids = NULL;
2690                         }
2691                         srs->sr_state.numcsns = 0;
2692                 } else {
2693                         gotstate = 1;
2694                         /* If changed and doing Present lookup, send Present UUIDs */
2695                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2696                                 LDAP_SUCCESS ) {
2697                                 if ( ctxcsn )
2698                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2699                                 if ( sids )
2700                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2701                                 goto bailout;
2702                         }
2703                 }
2704         } else {
2705                 /* No consumer state, assume something has changed */
2706                 changed = SS_CHANGED;
2707         }
2708
2709 shortcut:
2710         /* Append CSN range to search filter, save original filter
2711          * for persistent search evaluation
2712          */
2713         if ( sop ) {
2714                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2715                 sop->s_filterstr = op->ors_filterstr;
2716                 /* correct the refcount that was set to 2 before */
2717                 sop->s_inuse--;
2718         }
2719
2720         /* If something changed, find the changes */
2721         if ( gotstate && ( changed || dirty ) ) {
2722                 Filter *fand, *fava;
2723
2724                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2725                 fand->f_choice = LDAP_FILTER_AND;
2726                 fand->f_next = NULL;
2727                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2728                 fand->f_and = fava;
2729                 fava->f_choice = LDAP_FILTER_GE;
2730                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2731                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2732 #ifdef LDAP_COMP_MATCH
2733                 fava->f_ava->aa_cf = NULL;
2734 #endif
2735                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2736                 fava->f_next = op->ors_filter;
2737                 op->ors_filter = fand;
2738                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2739                 if ( sop ) {
2740                         sop->s_flags |= PS_FIX_FILTER;
2741                 }
2742         }
2743         if ( sop ) {
2744                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2745         }
2746
2747         /* Let our callback add needed info to returned entries */
2748         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2749         ss = (searchstate *)(cb+1);
2750         ss->ss_on = on;
2751         ss->ss_so = sop;
2752         ss->ss_flags = do_present | changed;
2753         ss->ss_ctxcsn = ctxcsn;
2754         ss->ss_numcsns = numcsns;
2755         ss->ss_sids = sids;
2756         cb->sc_response = syncprov_search_response;
2757         cb->sc_cleanup = syncprov_search_cleanup;
2758         cb->sc_private = ss;
2759         cb->sc_next = op->o_callback;
2760         op->o_callback = cb;
2761
2762         /* If this is a persistent search and no changes were reported during
2763          * the refresh phase, just invoke the response callback to transition
2764          * us into persist phase
2765          */
2766         if ( !changed && !dirty ) {
2767                 rs->sr_err = LDAP_SUCCESS;
2768                 rs->sr_nentries = 0;
2769                 send_ldap_result( op, rs );
2770                 return rs->sr_err;
2771         }
2772         return SLAP_CB_CONTINUE;
2773 }
2774
2775 static int
2776 syncprov_operational(
2777         Operation *op,
2778         SlapReply *rs )
2779 {
2780         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2781         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2782
2783         /* This prevents generating unnecessarily; frontend will strip
2784          * any statically stored copy.
2785          */
2786         if ( op->o_sync != SLAP_CONTROL_NONE )
2787                 return SLAP_CB_CONTINUE;
2788
2789         if ( rs->sr_entry &&
2790                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2791
2792                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2793                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2794                         Attribute *a, **ap = NULL;
2795
2796                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2797                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2798                                         break;
2799                         }
2800
2801                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2802                         if ( si->si_ctxcsn ) {
2803                                 if ( !a ) {
2804                                         for ( ap = &rs->sr_operational_attrs; *ap;
2805                                                 ap=&(*ap)->a_next );
2806
2807                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2808                                         *ap = a;
2809                                 }
2810
2811                                 if ( !ap ) {
2812                                         if ( rs_entry2modifiable( op, rs, on )) {
2813                                                 a = attr_find( rs->sr_entry->e_attrs,
2814                                                         slap_schema.si_ad_contextCSN );
2815                                         }
2816                                         if ( a->a_nvals != a->a_vals ) {
2817                                                 ber_bvarray_free( a->a_nvals );
2818                                         }
2819                                         a->a_nvals = NULL;
2820                                         ber_bvarray_free( a->a_vals );
2821                                         a->a_vals = NULL;
2822                                         a->a_numvals = 0;
2823                                 }
2824                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2825                         }
2826                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2827                 }
2828         }
2829         return SLAP_CB_CONTINUE;
2830 }
2831
2832 enum {
2833         SP_CHKPT = 1,
2834         SP_SESSL,
2835         SP_NOPRES,
2836         SP_USEHINT
2837 };
2838
2839 static ConfigDriver sp_cf_gen;
2840
2841 static ConfigTable spcfg[] = {
2842         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2843                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2844                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2845                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2846         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2847                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2848                         "DESC 'Session log size in ops' "
2849                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2850         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2851                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2852                         "DESC 'Omit Present phase processing' "
2853                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2854         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2855                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2856                         "DESC 'Observe Reload Hint in Request control' "
2857                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2858         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2859 };
2860
2861 static ConfigOCs spocs[] = {
2862         { "( OLcfgOvOc:1.1 "
2863                 "NAME 'olcSyncProvConfig' "
2864                 "DESC 'SyncRepl Provider configuration' "
2865                 "SUP olcOverlayConfig "
2866                 "MAY ( olcSpCheckpoint "
2867                         "$ olcSpSessionlog "
2868                         "$ olcSpNoPresent "
2869                         "$ olcSpReloadHint "
2870                 ") )",
2871                         Cft_Overlay, spcfg },
2872         { NULL, 0, NULL }
2873 };
2874
2875 static int
2876 sp_cf_gen(ConfigArgs *c)
2877 {
2878         slap_overinst           *on = (slap_overinst *)c->bi;
2879         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2880         int rc = 0;
2881
2882         if ( c->op == SLAP_CONFIG_EMIT ) {
2883                 switch ( c->type ) {
2884                 case SP_CHKPT:
2885                         if ( si->si_chkops || si->si_chktime ) {
2886                                 struct berval bv;
2887                                 /* we assume si_chktime is a multiple of 60
2888                                  * because the parsed value was originally
2889                                  * multiplied by 60 */
2890                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2891                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2892                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2893                                         rc = 1;
2894                                 } else {
2895                                         bv.bv_val = c->cr_msg;
2896                                         value_add_one( &c->rvalue_vals, &bv );
2897                                 }
2898                         } else {
2899                                 rc = 1;
2900                         }
2901                         break;
2902                 case SP_SESSL:
2903                         if ( si->si_logs ) {
2904                                 c->value_int = si->si_logs->sl_size;
2905                         } else {
2906                                 rc = 1;
2907                         }
2908                         break;
2909                 case SP_NOPRES:
2910                         if ( si->si_nopres ) {
2911                                 c->value_int = 1;
2912                         } else {
2913                                 rc = 1;
2914                         }
2915                         break;
2916                 case SP_USEHINT:
2917                         if ( si->si_usehint ) {
2918                                 c->value_int = 1;
2919                         } else {
2920                                 rc = 1;
2921                         }
2922                         break;
2923                 }
2924                 return rc;
2925         } else if ( c->op == LDAP_MOD_DELETE ) {
2926                 switch ( c->type ) {
2927                 case SP_CHKPT:
2928                         si->si_chkops = 0;
2929                         si->si_chktime = 0;
2930                         break;
2931                 case SP_SESSL:
2932                         if ( si->si_logs )
2933                                 si->si_logs->sl_size = 0;
2934                         else
2935                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2936                         break;
2937                 case SP_NOPRES:
2938                         if ( si->si_nopres )
2939                                 si->si_nopres = 0;
2940                         else
2941                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2942                         break;
2943                 case SP_USEHINT:
2944                         if ( si->si_usehint )
2945                                 si->si_usehint = 0;
2946                         else
2947                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2948                         break;
2949                 }
2950                 return rc;
2951         }
2952         switch ( c->type ) {
2953         case SP_CHKPT:
2954                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2955                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2956                                 c->argv[0], c->argv[1] );
2957                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2958                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2959                         return ARG_BAD_CONF;
2960                 }
2961                 if ( si->si_chkops <= 0 ) {
2962                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2963                                 c->argv[0], si->si_chkops );
2964                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2965                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2966                         return ARG_BAD_CONF;
2967                 }
2968                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2969                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2970                                 c->argv[0], c->argv[1] );
2971                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2972                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2973                         return ARG_BAD_CONF;
2974                 }
2975                 if ( si->si_chktime <= 0 ) {
2976                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2977                                 c->argv[0], si->si_chkops );
2978                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2979                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2980                         return ARG_BAD_CONF;
2981                 }
2982                 si->si_chktime *= 60;
2983                 break;
2984         case SP_SESSL: {
2985                 sessionlog *sl;
2986                 int size = c->value_int;
2987
2988                 if ( size < 0 ) {
2989                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2990                                 c->argv[0], size );
2991                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2992                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2993                         return ARG_BAD_CONF;
2994                 }
2995                 sl = si->si_logs;
2996                 if ( !sl ) {
2997                         sl = ch_malloc( sizeof( sessionlog ));
2998                         sl->sl_mincsn = NULL;
2999                         sl->sl_sids = NULL;
3000                         sl->sl_num = 0;
3001                         sl->sl_numcsns = 0;
3002                         sl->sl_head = sl->sl_tail = NULL;
3003                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3004                         si->si_logs = sl;
3005                 }
3006                 sl->sl_size = size;
3007                 }
3008                 break;
3009         case SP_NOPRES:
3010                 si->si_nopres = c->value_int;
3011                 break;
3012         case SP_USEHINT:
3013                 si->si_usehint = c->value_int;
3014                 break;
3015         }
3016         return rc;
3017 }
3018
3019 /* ITS#3456 we cannot run this search on the main thread, must use a
3020  * child thread in order to insure we have a big enough stack.
3021  */
3022 static void *
3023 syncprov_db_otask(
3024         void *ptr
3025 )
3026 {
3027         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3028         return NULL;
3029 }
3030
3031
3032 /* Read any existing contextCSN from the underlying db.
3033  * Then search for any entries newer than that. If no value exists,
3034  * just generate it. Cache whatever result.
3035  */
3036 static int
3037 syncprov_db_open(
3038         BackendDB *be,
3039         ConfigReply *cr
3040 )
3041 {
3042         slap_overinst   *on = (slap_overinst *) be->bd_info;
3043         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3044
3045         Connection conn = { 0 };
3046         OperationBuffer opbuf;
3047         Operation *op;
3048         Entry *e = NULL;
3049         Attribute *a;
3050         int rc;
3051         void *thrctx = NULL;
3052
3053         if ( !SLAP_LASTMOD( be )) {
3054                 Debug( LDAP_DEBUG_ANY,
3055                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3056                 return -1;
3057         }
3058
3059         if ( slapMode & SLAP_TOOL_MODE ) {
3060                 return 0;
3061         }
3062
3063         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3064         if ( rc ) {
3065                 return rc;
3066         }
3067
3068         thrctx = ldap_pvt_thread_pool_context();
3069         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3070         op = &opbuf.ob_op;
3071         op->o_bd = be;
3072         op->o_dn = be->be_rootdn;
3073         op->o_ndn = be->be_rootndn;
3074
3075         if ( SLAP_SYNC_SUBENTRY( be )) {
3076                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3077                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3078         } else {
3079                 si->si_contextdn = be->be_nsuffix[0];
3080         }
3081         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3082                 slap_schema.si_ad_contextCSN, 0, &e, on );
3083
3084         if ( e ) {
3085                 ldap_pvt_thread_t tid;
3086
3087                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3088                 if ( a ) {
3089                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3090                         si->si_numcsns = a->a_numvals;
3091                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3092                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3093                 }
3094                 overlay_entry_release_ov( op, e, 0, on );
3095                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3096                         op->o_tag = LDAP_REQ_SEARCH;
3097                         op->o_req_dn = be->be_suffix[0];
3098                         op->o_req_ndn = be->be_nsuffix[0];
3099                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3100                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3101                         ldap_pvt_thread_join( tid, NULL );
3102                 }
3103         }
3104
3105         /* Didn't find a contextCSN, should we generate one? */
3106         if ( !si->si_ctxcsn ) {
3107                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3108                 struct berval csn;
3109
3110                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3111                 /* If we're also a consumer, then don't generate anything.
3112                  * Wait for our provider to send it to us, or for a local
3113                  * modify if we have multimaster.
3114                  */
3115                         goto out;
3116                 }
3117                 csn.bv_val = csnbuf;
3118                 csn.bv_len = sizeof( csnbuf );
3119                 slap_get_csn( op, &csn, 0 );
3120                 value_add_one( &si->si_ctxcsn, &csn );
3121                 si->si_numcsns = 1;
3122                 si->si_sids = ch_malloc( sizeof(int) );
3123                 si->si_sids[0] = slap_serverID;
3124
3125                 /* make sure we do a checkpoint on close */
3126                 si->si_numops++;
3127         }
3128
3129         /* Initialize the sessionlog mincsn */
3130         if ( si->si_logs && si->si_numcsns ) {
3131                 sessionlog *sl = si->si_logs;
3132                 int i;
3133                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3134                 sl->sl_numcsns = si->si_numcsns;
3135                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3136                 for ( i=0; i < si->si_numcsns; i++ )
3137                         sl->sl_sids[i] = si->si_sids[i];
3138         }
3139
3140 out:
3141         op->o_bd->bd_info = (BackendInfo *)on;
3142         return 0;
3143 }
3144
3145 /* Write the current contextCSN into the underlying db.
3146  */
3147 static int
3148 syncprov_db_close(
3149         BackendDB *be,
3150         ConfigReply *cr
3151 )
3152 {
3153     slap_overinst   *on = (slap_overinst *) be->bd_info;
3154     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3155 #ifdef SLAP_CONFIG_DELETE
3156         syncops *so, *sonext;
3157 #endif /* SLAP_CONFIG_DELETE */
3158
3159         if ( slapMode & SLAP_TOOL_MODE ) {
3160                 return 0;
3161         }
3162         if ( si->si_numops ) {
3163                 Connection conn = {0};
3164                 OperationBuffer opbuf;
3165                 Operation *op;
3166                 void *thrctx;
3167
3168                 thrctx = ldap_pvt_thread_pool_context();
3169                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3170                 op = &opbuf.ob_op;
3171                 op->o_bd = be;
3172                 op->o_dn = be->be_rootdn;
3173                 op->o_ndn = be->be_rootndn;
3174                 syncprov_checkpoint( op, on );
3175         }
3176
3177 #ifdef SLAP_CONFIG_DELETE
3178         if ( !slapd_shutdown ) {
3179                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3180                         SlapReply rs = {REP_RESULT};
3181                         rs.sr_err = LDAP_UNAVAILABLE;
3182                         send_ldap_result( so->s_op, &rs );
3183                         sonext=so->s_next;
3184                         syncprov_drop_psearch( so, 0);
3185                 }
3186                 si->si_ops=NULL;
3187         }
3188         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3189 #endif /* SLAP_CONFIG_DELETE */
3190
3191     return 0;
3192 }
3193
3194 static int
3195 syncprov_db_init(
3196         BackendDB *be,
3197         ConfigReply *cr
3198 )
3199 {
3200         slap_overinst   *on = (slap_overinst *)be->bd_info;
3201         syncprov_info_t *si;
3202
3203         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3204                 Debug( LDAP_DEBUG_ANY,
3205                         "syncprov must be instantiated within a database.\n",
3206                         0, 0, 0 );
3207                 return 1;
3208         }
3209
3210         si = ch_calloc(1, sizeof(syncprov_info_t));
3211         on->on_bi.bi_private = si;
3212         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3213         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3214         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3215         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3216
3217         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3218         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3219         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3220         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3221
3222         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3223         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3224
3225         return 0;
3226 }
3227
3228 static int
3229 syncprov_db_destroy(
3230         BackendDB *be,
3231         ConfigReply *cr
3232 )
3233 {
3234         slap_overinst   *on = (slap_overinst *)be->bd_info;
3235         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3236
3237         if ( si ) {
3238                 if ( si->si_logs ) {
3239                         sessionlog *sl = si->si_logs;
3240                         slog_entry *se = sl->sl_head;
3241
3242                         while ( se ) {
3243                                 slog_entry *se_next = se->se_next;
3244                                 ch_free( se );
3245                                 se = se_next;
3246                         }
3247                         if ( sl->sl_mincsn )
3248                                 ber_bvarray_free( sl->sl_mincsn );
3249                         if ( sl->sl_sids )
3250                                 ch_free( sl->sl_sids );
3251
3252                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3253                         ch_free( si->si_logs );
3254                 }
3255                 if ( si->si_ctxcsn )
3256                         ber_bvarray_free( si->si_ctxcsn );
3257                 if ( si->si_sids )
3258                         ch_free( si->si_sids );
3259                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3260                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3261                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3262                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3263                 ch_free( si );
3264         }
3265
3266         return 0;
3267 }
3268
3269 static int syncprov_parseCtrl (
3270         Operation *op,
3271         SlapReply *rs,
3272         LDAPControl *ctrl )
3273 {
3274         ber_tag_t tag;
3275         BerElementBuffer berbuf;
3276         BerElement *ber = (BerElement *)&berbuf;
3277         ber_int_t mode;
3278         ber_len_t len;
3279         struct berval cookie = BER_BVNULL;
3280         sync_control *sr;
3281         int rhint = 0;
3282
3283         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3284                 rs->sr_text = "Sync control specified multiple times";
3285                 return LDAP_PROTOCOL_ERROR;
3286         }
3287
3288         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3289                 rs->sr_text = "Sync control specified with pagedResults control";
3290                 return LDAP_PROTOCOL_ERROR;
3291         }
3292
3293         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3294                 rs->sr_text = "Sync control value is absent";
3295                 return LDAP_PROTOCOL_ERROR;
3296         }
3297
3298         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3299                 rs->sr_text = "Sync control value is empty";
3300                 return LDAP_PROTOCOL_ERROR;
3301         }
3302
3303         /* Parse the control value
3304          *      syncRequestValue ::= SEQUENCE {
3305          *              mode   ENUMERATED {
3306          *                      -- 0 unused
3307          *                      refreshOnly             (1),
3308          *                      -- 2 reserved
3309          *                      refreshAndPersist       (3)
3310          *              },
3311          *              cookie  syncCookie OPTIONAL
3312          *      }
3313          */
3314
3315         ber_init2( ber, &ctrl->ldctl_value, 0 );
3316
3317         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3318                 rs->sr_text = "Sync control : mode decoding error";
3319                 return LDAP_PROTOCOL_ERROR;
3320         }
3321
3322         switch( mode ) {
3323         case LDAP_SYNC_REFRESH_ONLY:
3324                 mode = SLAP_SYNC_REFRESH;
3325                 break;
3326         case LDAP_SYNC_REFRESH_AND_PERSIST:
3327                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3328                 break;
3329         default:
3330                 rs->sr_text = "Sync control : unknown update mode";
3331                 return LDAP_PROTOCOL_ERROR;
3332         }
3333
3334         tag = ber_peek_tag( ber, &len );
3335
3336         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3337                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3338                         rs->sr_text = "Sync control : cookie decoding error";
3339                         return LDAP_PROTOCOL_ERROR;
3340                 }
3341                 tag = ber_peek_tag( ber, &len );
3342         }
3343         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3344                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3345                         rs->sr_text = "Sync control : rhint decoding error";
3346                         return LDAP_PROTOCOL_ERROR;
3347                 }
3348         }
3349         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3350                         rs->sr_text = "Sync control : decoding error";
3351                         return LDAP_PROTOCOL_ERROR;
3352         }
3353         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3354         sr->sr_rhint = rhint;
3355         if (!BER_BVISNULL(&cookie)) {
3356                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3357                 /* If parse fails, pretend no cookie was sent */
3358                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3359                         sr->sr_state.rid == -1 ) {
3360                         if ( sr->sr_state.ctxcsn ) {
3361                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3362                                 sr->sr_state.ctxcsn = NULL;
3363                         }
3364                         sr->sr_state.numcsns = 0;
3365                 }
3366         }
3367
3368         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3369
3370         op->o_sync = ctrl->ldctl_iscritical
3371                 ? SLAP_CONTROL_CRITICAL
3372                 : SLAP_CONTROL_NONCRITICAL;
3373
3374         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3375
3376         return LDAP_SUCCESS;
3377 }
3378
3379 /* This overlay is set up for dynamic loading via moduleload. For static
3380  * configuration, you'll need to arrange for the slap_overinst to be
3381  * initialized and registered by some other function inside slapd.
3382  */
3383
3384 static slap_overinst            syncprov;
3385
3386 int
3387 syncprov_initialize()
3388 {
3389         int rc;
3390
3391         rc = register_supported_control( LDAP_CONTROL_SYNC,
3392                 SLAP_CTRL_SEARCH, NULL,
3393                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3394         if ( rc != LDAP_SUCCESS ) {
3395                 Debug( LDAP_DEBUG_ANY,
3396                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3397                 return rc;
3398         }
3399
3400         syncprov.on_bi.bi_type = "syncprov";
3401         syncprov.on_bi.bi_db_init = syncprov_db_init;
3402         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3403         syncprov.on_bi.bi_db_open = syncprov_db_open;
3404         syncprov.on_bi.bi_db_close = syncprov_db_close;
3405
3406         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3407         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3408
3409         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3410         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3411         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3412         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3413         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3414         syncprov.on_bi.bi_op_search = syncprov_op_search;
3415         syncprov.on_bi.bi_extended = syncprov_op_extended;
3416         syncprov.on_bi.bi_operational = syncprov_operational;
3417
3418         syncprov.on_bi.bi_cf_ocs = spocs;
3419
3420         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3421
3422         rc = config_register_schema( spcfg, spocs );
3423         if ( rc ) return rc;
3424
3425         return overlay_register( &syncprov );
3426 }
3427
3428 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3429 int
3430 init_module( int argc, char *argv[] )
3431 {
3432         return syncprov_initialize();
3433 }
3434 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3435
3436 #endif /* defined(SLAPD_OVER_SYNCPROV) */