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 2004-2009 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         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74 #define PS_TASK_QUEUED          0x20
  75
  76         int             s_inuse;        /* reference count */
  77         struct syncres *s_res;
  78         struct syncres *s_restail;
  79         ldap_pvt_thread_mutex_t s_mutex;
  80 } syncops;
  81
  82 /* A received sync control */
  83 typedef struct sync_control {
  84         struct sync_cookie sr_state;
  85         int sr_rhint;
  86 } sync_control;
  87
  88 #if 0 /* moved back to slap.h */
  89 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  90 #endif
  91 /* o_sync_mode uses data bits of o_sync */
  92 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  93
  94 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  95 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  98
  99 /* Record of which searches matched at premodify step */
 100 typedef struct syncmatches {
 101         struct syncmatches *sm_next;
 102         syncops *sm_op;
 103 } syncmatches;
 104
 105 /* Session log data */
 106 typedef struct slog_entry {
 107         struct slog_entry *se_next;
 108         struct berval se_uuid;
 109         struct berval se_csn;
 110         int     se_sid;
 111         ber_tag_t       se_tag;
 112 } slog_entry;
 113
 114 typedef struct sessionlog {
 115         struct berval   sl_mincsn;
 116         int             sl_num;
 117         int             sl_size;
 118         slog_entry *sl_head;
 119         slog_entry *sl_tail;
 120         ldap_pvt_thread_mutex_t sl_mutex;
 121 } sessionlog;
 122
 123 /* The main state for this overlay */
 124 typedef struct syncprov_info_t {
 125         syncops         *si_ops;
 126         BerVarray       si_ctxcsn;      /* ldapsync context */
 127         int             *si_sids;
 128         int             si_numcsns;
 129         int             si_chkops;      /* checkpointing info */
 130         int             si_chktime;
 131         int             si_numops;      /* number of ops since last checkpoint */
 132         int             si_nopres;      /* Skip present phase */
 133         int             si_usehint;     /* use reload hint */
 134         time_t  si_chklast;     /* time of last checkpoint */
 135         Avlnode *si_mods;       /* entries being modified */
 136         sessionlog      *si_logs;
 137         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 138         ldap_pvt_thread_mutex_t si_ops_mutex;
 139         ldap_pvt_thread_mutex_t si_mods_mutex;
 140 } syncprov_info_t;
 141
 142 typedef struct opcookie {
 143         slap_overinst *son;
 144         syncmatches *smatches;
 145         modtarget *smt;
 146         struct berval sdn;      /* DN of entry, for deletes */
 147         struct berval sndn;
 148         struct berval suuid;    /* UUID of entry */
 149         struct berval sctxcsn;
 150         short osid;     /* sid of op csn */
 151         short rsid;     /* sid of relay */
 152         short sreference;       /* Is the entry a reference? */
 153 } opcookie;
 154
 155 typedef struct fbase_cookie {
 156         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 157         syncops *fss;   /* persistent search we're testing against */
 158         int fbase;      /* if TRUE we found the search base and it's still valid */
 159         int fscope;     /* if TRUE then fdn is within the psearch scope */
 160 } fbase_cookie;
 161
 162 static AttributeName csn_anlist[3];
 163 static AttributeName uuid_anlist[2];
 164
 165 /* Build a LDAPsync intermediate state control */
 166 static int
 167 syncprov_state_ctrl(
 168         Operation       *op,
 169         SlapReply       *rs,
 170         Entry           *e,
 171         int             entry_sync_state,
 172         LDAPControl     **ctrls,
 173         int             num_ctrls,
 174         int             send_cookie,
 175         struct berval   *cookie )
 176 {
 177         Attribute* a;
 178         int ret;
 179
 180         BerElementBuffer berbuf;
 181         BerElement *ber = (BerElement *)&berbuf;
 182
 183         struct berval   entryuuid_bv = BER_BVNULL;
 184
 185         ber_init2( ber, 0, LBER_USE_DER );
 186         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 187
 188         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 189
 190         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 191                 AttributeDescription *desc = a->a_desc;
 192                 if ( desc == slap_schema.si_ad_entryUUID ) {
 193                         entryuuid_bv = a->a_nvals[0];
 194                         break;
 195                 }
 196         }
 197
 198         /* FIXME: what if entryuuid is NULL or empty ? */
 199
 200         if ( send_cookie && cookie ) {
 201                 ber_printf( ber, "{eOON}",
 202                         entry_sync_state, &entryuuid_bv, cookie );
 203         } else {
 204                 ber_printf( ber, "{eON}",
 205                         entry_sync_state, &entryuuid_bv );
 206         }
 207
 208         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 209         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 210         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 211
 212         ber_free_buf( ber );
 213
 214         if ( ret < 0 ) {
 215                 Debug( LDAP_DEBUG_TRACE,
 216                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 217                         0, 0, 0 );
 218                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 219                 return ret;
 220         }
 221
 222         return LDAP_SUCCESS;
 223 }
 224
 225 /* Build a LDAPsync final state control */
 226 static int
 227 syncprov_done_ctrl(
 228         Operation       *op,
 229         SlapReply       *rs,
 230         LDAPControl     **ctrls,
 231         int                     num_ctrls,
 232         int                     send_cookie,
 233         struct berval *cookie,
 234         int                     refreshDeletes )
 235 {
 236         int ret;
 237         BerElementBuffer berbuf;
 238         BerElement *ber = (BerElement *)&berbuf;
 239
 240         ber_init2( ber, NULL, LBER_USE_DER );
 241         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 242
 243         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 244
 245         ber_printf( ber, "{" );
 246         if ( send_cookie && cookie ) {
 247                 ber_printf( ber, "O", cookie );
 248         }
 249         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 250                 ber_printf( ber, "b", refreshDeletes );
 251         }
 252         ber_printf( ber, "N}" );
 253
 254         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 255         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 256         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 257
 258         ber_free_buf( ber );
 259
 260         if ( ret < 0 ) {
 261                 Debug( LDAP_DEBUG_TRACE,
 262                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 263                         0, 0, 0 );
 264                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 265                 return ret;
 266         }
 267
 268         return LDAP_SUCCESS;
 269 }
 270
 271 static int
 272 syncprov_sendinfo(
 273         Operation       *op,
 274         SlapReply       *rs,
 275         int                     type,
 276         struct berval *cookie,
 277         int                     refreshDone,
 278         BerVarray       syncUUIDs,
 279         int                     refreshDeletes )
 280 {
 281         BerElementBuffer berbuf;
 282         BerElement *ber = (BerElement *)&berbuf;
 283         struct berval rspdata;
 284
 285         int ret;
 286
 287         ber_init2( ber, NULL, LBER_USE_DER );
 288         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 289
 290         if ( type ) {
 291                 switch ( type ) {
 292                 case LDAP_TAG_SYNC_NEW_COOKIE:
 293                         ber_printf( ber, "tO", type, cookie );
 294                         break;
 295                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 296                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDone == 0 ) {
 302                                 ber_printf( ber, "b", refreshDone );
 303                         }
 304                         ber_printf( ber, "N}" );
 305                         break;
 306                 case LDAP_TAG_SYNC_ID_SET:
 307                         ber_printf( ber, "t{", type );
 308                         if ( cookie ) {
 309                                 ber_printf( ber, "O", cookie );
 310                         }
 311                         if ( refreshDeletes == 1 ) {
 312                                 ber_printf( ber, "b", refreshDeletes );
 313                         }
 314                         ber_printf( ber, "[W]", syncUUIDs );
 315                         ber_printf( ber, "N}" );
 316                         break;
 317                 default:
 318                         Debug( LDAP_DEBUG_TRACE,
 319                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 320                                 type, 0, 0 );
 321                         return LDAP_OTHER;
 322                 }
 323         }
 324
 325         ret = ber_flatten2( ber, &rspdata, 0 );
 326
 327         if ( ret < 0 ) {
 328                 Debug( LDAP_DEBUG_TRACE,
 329                         "syncprov_sendinfo: ber_flatten2 failed\n",
 330                         0, 0, 0 );
 331                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 332                 return ret;
 333         }
 334
 335         rs->sr_rspoid = LDAP_SYNC_INFO;
 336         rs->sr_rspdata = &rspdata;
 337         send_ldap_intermediate( op, rs );
 338         rs->sr_rspdata = NULL;
 339         ber_free_buf( ber );
 340
 341         return LDAP_SUCCESS;
 342 }
 343
 344 /* Find a modtarget in an AVL tree */
 345 static int
 346 sp_avl_cmp( const void *c1, const void *c2 )
 347 {
 348         const modtarget *m1, *m2;
 349         int rc;
 350
 351         m1 = c1; m2 = c2;
 352         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 353
 354         if ( rc ) return rc;
 355         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 356 }
 357
 358 /* syncprov_findbase:
 359  *   finds the true DN of the base of a search (with alias dereferencing) and
 360  * checks to make sure the base entry doesn't get replaced with a different
 361  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 362  * change is detected, any persistent search on this base must be terminated /
 363  * reloaded.
 364  *   On the first call, we just save the DN and entryID. On subsequent calls
 365  * we compare the DN and entryID with the saved values.
 366  */
 367 static int
 368 findbase_cb( Operation *op, SlapReply *rs )
 369 {
 370         slap_callback *sc = op->o_callback;
 371
 372         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 373                 fbase_cookie *fc = sc->sc_private;
 374
 375                 /* If no entryID, we're looking for the first time.
 376                  * Just store whatever we got.
 377                  */
 378                 if ( fc->fss->s_eid == NOID ) {
 379                         fc->fbase = 2;
 380                         fc->fss->s_eid = rs->sr_entry->e_id;
 381                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 382
 383                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 384                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 385
 386                 /* OK, the DN is the same and the entryID is the same. */
 387                         fc->fbase = 1;
 388                 }
 389         }
 390         if ( rs->sr_err != LDAP_SUCCESS ) {
 391                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 392         }
 393         return LDAP_SUCCESS;
 394 }
 395
 396 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 397 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 398
 399 static int
 400 syncprov_findbase( Operation *op, fbase_cookie *fc )
 401 {
 402         /* Use basic parameters from syncrepl search, but use
 403          * current op's threadctx / tmpmemctx
 404          */
 405         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 406         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 407                 slap_callback cb = {0};
 408                 Operation fop;
 409                 SlapReply frs = { REP_RESULT };
 410                 int rc;
 411
 412                 fc->fss->s_flags ^= PS_FIND_BASE;
 413                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 414
 415                 fop = *fc->fss->s_op;
 416
 417                 fop.o_bd = fop.o_bd->bd_self;
 418                 fop.o_hdr = op->o_hdr;
 419                 fop.o_time = op->o_time;
 420                 fop.o_tincr = op->o_tincr;
 421
 422                 cb.sc_response = findbase_cb;
 423                 cb.sc_private = fc;
 424
 425                 fop.o_sync_mode = 0;    /* turn off sync mode */
 426                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 427                 fop.o_callback = &cb;
 428                 fop.o_tag = LDAP_REQ_SEARCH;
 429                 fop.ors_scope = LDAP_SCOPE_BASE;
 430                 fop.ors_limit = NULL;
 431                 fop.ors_slimit = 1;
 432                 fop.ors_tlimit = SLAP_NO_LIMIT;
 433                 fop.ors_attrs = slap_anlist_no_attrs;
 434                 fop.ors_attrsonly = 1;
 435                 fop.ors_filter = &generic_filter;
 436                 fop.ors_filterstr = generic_filterstr;
 437
 438                 rc = fop.o_bd->be_search( &fop, &frs );
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 504                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 505                         maxcsn->bv_len = a->a_vals[0].bv_len;
 506                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 507                 }
 508         }
 509         return LDAP_SUCCESS;
 510 }
 511
 512 static int
 513 findcsn_cb( Operation *op, SlapReply *rs )
 514 {
 515         slap_callback *sc = op->o_callback;
 516
 517         /* We just want to know that at least one exists, so it's OK if
 518          * we exceed the unchecked limit.
 519          */
 520         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 521                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 522                 sc->sc_private = (void *)1;
 523         }
 524         return LDAP_SUCCESS;
 525 }
 526
 527 /* Build a list of entryUUIDs for sending in a SyncID set */
 528
 529 #define UUID_LEN        16
 530
 531 typedef struct fpres_cookie {
 532         int num;
 533         BerVarray uuids;
 534         char *last;
 535 } fpres_cookie;
 536
 537 static int
 538 findpres_cb( Operation *op, SlapReply *rs )
 539 {
 540         slap_callback *sc = op->o_callback;
 541         fpres_cookie *pc = sc->sc_private;
 542         Attribute *a;
 543         int ret = SLAP_CB_CONTINUE;
 544
 545         switch ( rs->sr_type ) {
 546         case REP_SEARCH:
 547                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 548                 if ( a ) {
 549                         pc->uuids[pc->num].bv_val = pc->last;
 550                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 551                                 pc->uuids[pc->num].bv_len );
 552                         pc->num++;
 553                         pc->last = pc->uuids[pc->num].bv_val;
 554                         pc->uuids[pc->num].bv_val = NULL;
 555                 }
 556                 ret = LDAP_SUCCESS;
 557                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 558                         break;
 559                 /* FALLTHRU */
 560         case REP_RESULT:
 561                 ret = rs->sr_err;
 562                 if ( pc->num ) {
 563                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 564                                 0, pc->uuids, 0 );
 565                         pc->uuids[pc->num].bv_val = pc->last;
 566                         pc->num = 0;
 567                         pc->last = pc->uuids[0].bv_val;
 568                 }
 569                 break;
 570         default:
 571                 break;
 572         }
 573         return ret;
 574 }
 575
 576 static int
 577 syncprov_findcsn( Operation *op, find_csn_t mode )
 578 {
 579         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 580         syncprov_info_t         *si = on->on_bi.bi_private;
 581
 582         slap_callback cb = {0};
 583         Operation fop;
 584         SlapReply frs = { REP_RESULT };
 585         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 586         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 587         struct berval maxcsn;
 588         Filter cf;
 589         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 590         fpres_cookie pcookie;
 591         sync_control *srs = NULL;
 592         struct slap_limits_set fc_limits;
 593         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 594         int maxid;
 595
 596         if ( mode != FIND_MAXCSN ) {
 597                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 598         }
 599
 600         fop = *op;
 601         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 602         /* We want pure entries, not referrals */
 603         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 604
 605         cf.f_ava = &eq;
 606         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 607         BER_BVZERO( &cf.f_av_value );
 608         cf.f_next = NULL;
 609
 610         fop.o_callback = &cb;
 611         fop.ors_limit = NULL;
 612         fop.ors_tlimit = SLAP_NO_LIMIT;
 613         fop.ors_filter = &cf;
 614         fop.ors_filterstr.bv_val = buf;
 615
 616 again:
 617         switch( mode ) {
 618         case FIND_MAXCSN:
 619                 cf.f_choice = LDAP_FILTER_GE;
 620                 /* If there are multiple CSNs, use the one with our serverID */
 621                 for ( i=0; i<si->si_numcsns; i++) {
 622                         if ( slap_serverID == si->si_sids[i] ) {
 623                                 maxid = i;
 624                                 break;
 625                         }
 626                 }
 627                 if ( i == si->si_numcsns ) {
 628                         /* No match: this is multimaster, and none of the content in the DB
 629                          * originated locally. Treat like no CSN.
 630                          */
 631                         return LDAP_NO_SUCH_OBJECT;
 632                 }
 633                 cf.f_av_value = si->si_ctxcsn[maxid];
 634                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 635                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 636                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 637                         return LDAP_OTHER;
 638                 }
 639                 fop.ors_attrsonly = 0;
 640                 fop.ors_attrs = csn_anlist;
 641                 fop.ors_slimit = SLAP_NO_LIMIT;
 642                 cb.sc_private = &maxcsn;
 643                 cb.sc_response = findmax_cb;
 644                 strcpy( cbuf, cf.f_av_value.bv_val );
 645                 maxcsn.bv_val = cbuf;
 646                 maxcsn.bv_len = cf.f_av_value.bv_len;
 647                 break;
 648         case FIND_CSN:
 649                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 650                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 651                         /* If there are multiple CSNs, use the smallest */
 652                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 653                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 654                                         > 0 ) {
 655                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 656                                 }
 657                         }
 658                 }
 659                 /* Look for exact match the first time */
 660                 if ( findcsn_retry ) {
 661                         cf.f_choice = LDAP_FILTER_EQUALITY;
 662                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 663                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 664                 /* On retry, look for <= */
 665                 } else {
 666                         cf.f_choice = LDAP_FILTER_LE;
 667                         fop.ors_limit = &fc_limits;
 668                         memset( &fc_limits, 0, sizeof( fc_limits ));
 669                         fc_limits.lms_s_unchecked = 1;
 670                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 671                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 672                 }
 673                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 674                         return LDAP_OTHER;
 675                 }
 676                 fop.ors_attrsonly = 1;
 677                 fop.ors_attrs = slap_anlist_no_attrs;
 678                 fop.ors_slimit = 1;
 679                 cb.sc_private = NULL;
 680                 cb.sc_response = findcsn_cb;
 681                 break;
 682         case FIND_PRESENT:
 683                 fop.ors_filter = op->ors_filter;
 684                 fop.ors_filterstr = op->ors_filterstr;
 685                 fop.ors_attrsonly = 0;
 686                 fop.ors_attrs = uuid_anlist;
 687                 fop.ors_slimit = SLAP_NO_LIMIT;
 688                 cb.sc_private = &pcookie;
 689                 cb.sc_response = findpres_cb;
 690                 pcookie.num = 0;
 691
 692                 /* preallocate storage for a full set */
 693                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 694                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 695                         op->o_tmpmemctx );
 696                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 697                 pcookie.uuids[0].bv_val = pcookie.last;
 698                 pcookie.uuids[0].bv_len = UUID_LEN;
 699                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 700                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 701                         pcookie.uuids[i].bv_len = UUID_LEN;
 702                 }
 703                 break;
 704         }
 705
 706         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 707         fop.o_bd->be_search( &fop, &frs );
 708         fop.o_bd->bd_info = (BackendInfo *)on;
 709
 710         switch( mode ) {
 711         case FIND_MAXCSN:
 712                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 713 #ifdef CHECK_CSN
 714                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 715                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 716 #endif
 717                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 718                         si->si_numops++;        /* ensure a checkpoint */
 719                 }
 720                 break;
 721         case FIND_CSN:
 722                 /* If matching CSN was not found, invalidate the context. */
 723                 if ( !cb.sc_private ) {
 724                         /* If we didn't find an exact match, then try for <= */
 725                         if ( findcsn_retry ) {
 726                                 findcsn_retry = 0;
 727                                 goto again;
 728                         }
 729                         rc = LDAP_NO_SUCH_OBJECT;
 730                 }
 731                 break;
 732         case FIND_PRESENT:
 733                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 734                 break;
 735         }
 736
 737         return rc;
 738 }
 739
 740 static void
 741 syncprov_free_syncop( syncops *so )
 742 {
 743         syncres *sr, *srnext;
 744         GroupAssertion *ga, *gnext;
 745
 746         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 747         if ( --so->s_inuse > 0 ) {
 748                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 749                 return;
 750         }
 751         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 752         if ( so->s_flags & PS_IS_DETACHED ) {
 753                 filter_free( so->s_op->ors_filter );
 754                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 755                         gnext = ga->ga_next;
 756                         ch_free( ga );
 757                 }
 758                 ch_free( so->s_op );
 759         }
 760         ch_free( so->s_base.bv_val );
 761         for ( sr=so->s_res; sr; sr=srnext ) {
 762                 srnext = sr->s_next;
 763                 ch_free( sr );
 764         }
 765         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 766         ch_free( so );
 767 }
 768
 769 /* Send a persistent search response */
 770 static int
 771 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 772         Entry **e, int mode )
 773 {
 774         slap_overinst *on = opc->son;
 775
 776         SlapReply rs = { REP_SEARCH };
 777         LDAPControl *ctrls[2];
 778         struct berval cookie = BER_BVNULL, csns[2];
 779         Entry e_uuid = {0};
 780         Attribute a_uuid = {0};
 781
 782         if ( so->s_op->o_abandon )
 783                 return SLAPD_ABANDON;
 784
 785         ctrls[1] = NULL;
 786         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 787                 csns[0] = opc->sctxcsn;
 788                 BER_BVZERO( &csns[1] );
 789                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 790         }
 791
 792 #ifdef LDAP_DEBUG
 793         if ( !BER_BVISNULL( &cookie )) {
 794                 if ( so->s_sid > 0 ) {
 795                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 796                                 so->s_sid, cookie.bv_val , 0 );
 797                 } else {
 798                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 799                                 cookie.bv_val, 0, 0 );
 800                 }
 801         }
 802 #endif
 803
 804         e_uuid.e_attrs = &a_uuid;
 805         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 806         a_uuid.a_nvals = &opc->suuid;
 807         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 808                 mode, ctrls, 0, 1, &cookie );
 809         if ( !BER_BVISNULL( &cookie )) {
 810                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 811         }
 812
 813         rs.sr_ctrls = ctrls;
 814         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 815         switch( mode ) {
 816         case LDAP_SYNC_ADD:
 817                 rs.sr_entry = *e;
 818                 if ( rs.sr_entry->e_private )
 819                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 820                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 821                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 822                         rs.sr_err = send_search_reference( op, &rs );
 823                         ber_bvarray_free( rs.sr_ref );
 824                         if ( !rs.sr_entry )
 825                                 *e = NULL;
 826                         break;
 827                 }
 828                 /* fallthru */
 829         case LDAP_SYNC_MODIFY:
 830                 rs.sr_entry = *e;
 831                 if ( rs.sr_entry->e_private )
 832                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 833                 rs.sr_attrs = op->ors_attrs;
 834                 rs.sr_err = send_search_entry( op, &rs );
 835                 if ( !rs.sr_entry )
 836                         *e = NULL;
 837                 break;
 838         case LDAP_SYNC_DELETE:
 839                 e_uuid.e_attrs = NULL;
 840                 e_uuid.e_name = opc->sdn;
 841                 e_uuid.e_nname = opc->sndn;
 842                 rs.sr_entry = &e_uuid;
 843                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 844                         struct berval bv = BER_BVNULL;
 845                         rs.sr_ref = &bv;
 846                         rs.sr_err = send_search_reference( op, &rs );
 847                 } else {
 848                         rs.sr_err = send_search_entry( op, &rs );
 849                 }
 850                 break;
 851         default:
 852                 assert(0);
 853         }
 854         /* In case someone else freed it already? */
 855         if ( rs.sr_ctrls ) {
 856                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 857                 rs.sr_ctrls = NULL;
 858         }
 859
 860         return rs.sr_err;
 861 }
 862
 863 static void
 864 syncprov_qstart( syncops *so );
 865
 866 /* Play back queued responses */
 867 static int
 868 syncprov_qplay( Operation *op, syncops *so )
 869 {
 870         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 871         syncres *sr;
 872         Entry *e;
 873         opcookie opc;
 874         int rc = 0;
 875
 876         opc.son = on;
 877
 878         do {
 879                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 880                 sr = so->s_res;
 881                 if ( sr )
 882                         so->s_res = sr->s_next;
 883                 if ( !so->s_res )
 884                         so->s_restail = NULL;
 885                 /* Exit loop with mutex held */
 886                 if ( !sr || so->s_op->o_abandon )
 887                         break;
 888                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 889
 890                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 891                     SlapReply rs = { REP_INTERMEDIATE };
 892
 893                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 894                                 &sr->s_csn, 0, NULL, 0 );
 895                 } else {
 896                         opc.sdn = sr->s_dn;
 897                         opc.sndn = sr->s_ndn;
 898                         opc.suuid = sr->s_uuid;
 899                         opc.sctxcsn = sr->s_csn;
 900                         opc.sreference = sr->s_isreference;
 901                         e = NULL;
 902
 903                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 904                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 905                                 if ( rc ) {
 906                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 907                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 908                                         ch_free( sr );
 909                                         rc = 0;
 910                                         continue;
 911                                 }
 912                         }
 913                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 914
 915                         if ( e ) {
 916                                 overlay_entry_release_ov( op, e, 0, on );
 917                         }
 918                 }
 919
 920                 ch_free( sr );
 921
 922                 /* Exit loop with mutex held */
 923                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 924
 925         } while (0);
 926
 927         /* We now only send one change at a time, to prevent one
 928          * psearch from hogging all the CPU. Resubmit this task if
 929          * there are more responses queued and no errors occurred.
 930          */
 931
 932         if ( rc == 0 && so->s_res ) {
 933                 syncprov_qstart( so );
 934         } else {
 935                 so->s_flags ^= PS_TASK_QUEUED;
 936         }
 937
 938         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 939         return rc;
 940 }
 941
 942 /* task for playing back queued responses */
 943 static void *
 944 syncprov_qtask( void *ctx, void *arg )
 945 {
 946         syncops *so = arg;
 947         OperationBuffer opbuf;
 948         Operation *op;
 949         BackendDB be;
 950         int rc;
 951
 952         op = &opbuf.ob_op;
 953         *op = *so->s_op;
 954         op->o_hdr = &opbuf.ob_hdr;
 955         op->o_controls = opbuf.ob_controls;
 956         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 957
 958         *op->o_hdr = *so->s_op->o_hdr;
 959
 960         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 961         op->o_tmpmfuncs = &slap_sl_mfuncs;
 962         op->o_threadctx = ctx;
 963
 964         /* syncprov_qplay expects a fake db */
 965         be = *so->s_op->o_bd;
 966         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 967         op->o_bd = &be;
 968         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 969         op->o_callback = NULL;
 970
 971         rc = syncprov_qplay( op, so );
 972
 973         /* decrement use count... */
 974         syncprov_free_syncop( so );
 975
 976         return NULL;
 977 }
 978
 979 /* Start the task to play back queued psearch responses */
 980 static void
 981 syncprov_qstart( syncops *so )
 982 {
 983         so->s_flags |= PS_TASK_QUEUED;
 984         so->s_inuse++;
 985         ldap_pvt_thread_pool_submit( &connection_pool,
 986                 syncprov_qtask, so );
 987 }
 988
 989 /* Queue a persistent search response */
 990 static int
 991 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 992 {
 993         syncres *sr;
 994         int srsize;
 995         struct berval cookie = opc->sctxcsn;
 996
 997         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
 998                 syncprov_info_t *si = opc->son->on_bi.bi_private;
 999
1000                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1001                         so->s_rid, slap_serverID ? slap_serverID : -1);
1002         }
1003
1004         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1005                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1006         if ( cookie.bv_len )
1007                 srsize += cookie.bv_len + 1;
1008         sr = ch_malloc( srsize );
1009         sr->s_next = NULL;
1010         sr->s_dn.bv_val = (char *)(sr + 1);
1011         sr->s_dn.bv_len = opc->sdn.bv_len;
1012         sr->s_mode = mode;
1013         sr->s_isreference = opc->sreference;
1014         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1015                  opc->sdn.bv_val ) + 1;
1016         sr->s_ndn.bv_len = opc->sndn.bv_len;
1017         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1018                  opc->sndn.bv_val ) + 1;
1019         sr->s_uuid.bv_len = opc->suuid.bv_len;
1020         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1021         if ( cookie.bv_len ) {
1022                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1023                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1024         } else {
1025                 sr->s_csn.bv_val = NULL;
1026         }
1027         sr->s_csn.bv_len = cookie.bv_len;
1028
1029         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1030                 ch_free( cookie.bv_val );
1031         }
1032
1033         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1034         if ( !so->s_res ) {
1035                 so->s_res = sr;
1036         } else {
1037                 so->s_restail->s_next = sr;
1038         }
1039         so->s_restail = sr;
1040
1041         /* If the base of the psearch was modified, check it next time round */
1042         if ( so->s_flags & PS_WROTE_BASE ) {
1043                 so->s_flags ^= PS_WROTE_BASE;
1044                 so->s_flags |= PS_FIND_BASE;
1045         }
1046         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1047                 syncprov_qstart( so );
1048         }
1049         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1050         return LDAP_SUCCESS;
1051 }
1052
1053 static int
1054 syncprov_drop_psearch( syncops *so, int lock )
1055 {
1056         if ( so->s_flags & PS_IS_DETACHED ) {
1057                 if ( lock )
1058                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1059                 so->s_op->o_conn->c_n_ops_executing--;
1060                 so->s_op->o_conn->c_n_ops_completed++;
1061                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1062                         o_next );
1063                 if ( lock )
1064                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1065         }
1066         syncprov_free_syncop( so );
1067
1068         return 0;
1069 }
1070
1071 static int
1072 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1073 {
1074         slap_callback *sc = op->o_callback;
1075         op->o_callback = sc->sc_next;
1076         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1077         op->o_tmpfree( sc, op->o_tmpmemctx );
1078         return 0;
1079 }
1080
1081 static int
1082 syncprov_op_abandon( Operation *op, SlapReply *rs )
1083 {
1084         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1085         syncprov_info_t         *si = on->on_bi.bi_private;
1086         syncops *so, *soprev;
1087
1088         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1089         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1090                 soprev=so, so=so->s_next ) {
1091                 if ( so->s_op->o_connid == op->o_connid &&
1092                         so->s_op->o_msgid == op->orn_msgid ) {
1093                                 so->s_op->o_abandon = 1;
1094                                 soprev->s_next = so->s_next;
1095                                 break;
1096                 }
1097         }
1098         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1099         if ( so ) {
1100                 /* Is this really a Cancel exop? */
1101                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1102                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1103                         rs->sr_err = LDAP_CANCELLED;
1104                         send_ldap_result( so->s_op, rs );
1105                         if ( so->s_flags & PS_IS_DETACHED ) {
1106                                 slap_callback *cb;
1107                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1108                                 cb->sc_cleanup = syncprov_ab_cleanup;
1109                                 cb->sc_next = op->o_callback;
1110                                 cb->sc_private = so;
1111                                 return SLAP_CB_CONTINUE;
1112                         }
1113                 }
1114                 syncprov_drop_psearch( so, 0 );
1115         }
1116         return SLAP_CB_CONTINUE;
1117 }
1118
1119 /* Find which persistent searches are affected by this operation */
1120 static void
1121 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1122 {
1123         slap_overinst *on = opc->son;
1124         syncprov_info_t         *si = on->on_bi.bi_private;
1125
1126         fbase_cookie fc;
1127         syncops *ss, *sprev, *snext;
1128         Entry *e = NULL;
1129         Attribute *a;
1130         int rc;
1131         struct berval newdn;
1132         int freefdn = 0;
1133         BackendDB *b0 = op->o_bd, db;
1134
1135         fc.fdn = &op->o_req_ndn;
1136         /* compute new DN */
1137         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1138                 struct berval pdn;
1139                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1140                 else dnParent( fc.fdn, &pdn );
1141                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1142                 fc.fdn = &newdn;
1143                 freefdn = 1;
1144         }
1145         if ( op->o_tag != LDAP_REQ_ADD ) {
1146                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1147                         db = *op->o_bd;
1148                         op->o_bd = &db;
1149                 }
1150                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1151                 /* If we're sending responses now, make a copy and unlock the DB */
1152                 if ( e && !saveit ) {
1153                         Entry *e2 = entry_dup( e );
1154                         overlay_entry_release_ov( op, e, 0, on );
1155                         e = e2;
1156                 }
1157                 if ( rc ) {
1158                         op->o_bd = b0;
1159                         return;
1160                 }
1161         } else {
1162                 e = op->ora_e;
1163         }
1164
1165         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1166                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1167                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1168                 opc->sreference = is_entry_referral( e );
1169                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1170                 if ( a )
1171                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1172         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1173                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1174                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1175                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1176                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1177         }
1178
1179         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1180         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1181                 sprev = ss, ss=snext)
1182         {
1183                 Operation op2;
1184                 Opheader oh;
1185                 BackendDB be;
1186                 syncmatches *sm;
1187                 int found = 0;
1188
1189                 snext = ss->s_next;
1190                 if ( ss->s_op->o_abandon )
1191                         continue;
1192
1193                 /* First time thru, check for possible skips */
1194                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1195
1196                         /* Don't send ops back to the originator */
1197                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1198                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1199                                         opc->osid, 0, 0 );
1200                                 continue;
1201                         }
1202
1203                         /* Don't send ops back to the messenger */
1204                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1205                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1206                                         opc->rsid, 0, 0 );
1207                                 continue;
1208                         }
1209                 }
1210
1211                 /* validate base */
1212                 fc.fss = ss;
1213                 fc.fbase = 0;
1214                 fc.fscope = 0;
1215
1216                 /* If the base of the search is missing, signal a refresh */
1217                 rc = syncprov_findbase( op, &fc );
1218                 if ( rc != LDAP_SUCCESS ) {
1219                         SlapReply rs = {REP_RESULT};
1220                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1221                                 "search base has changed" );
1222                         sprev->s_next = snext;
1223                         syncprov_drop_psearch( ss, 1 );
1224                         ss = sprev;
1225                         continue;
1226                 }
1227
1228
1229                 /* If we're sending results now, look for this op in old matches */
1230                 if ( !saveit ) {
1231                         syncmatches *old;
1232
1233                         /* Did we modify the search base? */
1234                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1235                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1236                                 ss->s_flags |= PS_WROTE_BASE;
1237                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1238                         }
1239
1240                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1241                                 old=sm, sm=sm->sm_next ) {
1242                                 if ( sm->sm_op == ss ) {
1243                                         found = 1;
1244                                         old->sm_next = sm->sm_next;
1245                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1246                                         break;
1247                                 }
1248                         }
1249                 }
1250
1251                 if ( fc.fscope ) {
1252                         op2 = *ss->s_op;
1253                         be = *op2.o_bd;
1254                         oh = *op->o_hdr;
1255                         oh.oh_conn = ss->s_op->o_conn;
1256                         oh.oh_connid = ss->s_op->o_connid;
1257                         op2.o_bd = &be;
1258                         op2.o_hdr = &oh;
1259                         op2.o_extra = op->o_extra;
1260                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1261                 }
1262
1263                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1264                         ss->s_sid, fc.fscope, rc );
1265
1266                 /* check if current o_req_dn is in scope and matches filter */
1267                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1268                         if ( saveit ) {
1269                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1270                                 sm->sm_next = opc->smatches;
1271                                 sm->sm_op = ss;
1272                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1273                                 ++ss->s_inuse;
1274                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1275                                 opc->smatches = sm;
1276                         } else {
1277                                 /* if found send UPDATE else send ADD */
1278                                 syncprov_qresp( opc, ss,
1279                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1280                         }
1281                 } else if ( !saveit && found ) {
1282                         /* send DELETE */
1283                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1284                 } else if ( !saveit ) {
1285                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1286                 }
1287                 if ( !saveit && found ) {
1288                         /* Decrement s_inuse, was incremented when called
1289                          * with saveit == TRUE
1290                          */
1291                         syncprov_free_syncop( ss );
1292                 }
1293         }
1294         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1295
1296         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1297                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1298                         op->o_bd = &db;
1299                 }
1300                 overlay_entry_release_ov( op, e, 0, on );
1301                 op->o_bd = b0;
1302         }
1303         if ( freefdn ) {
1304                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1305         }
1306         op->o_bd = b0;
1307 }
1308
1309 static int
1310 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1311 {
1312         slap_callback *cb = op->o_callback;
1313         opcookie *opc = cb->sc_private;
1314         slap_overinst *on = opc->son;
1315         syncprov_info_t         *si = on->on_bi.bi_private;
1316         syncmatches *sm, *snext;
1317         modtarget *mt, mtdummy;
1318
1319         for (sm = opc->smatches; sm; sm=snext) {
1320                 snext = sm->sm_next;
1321                 syncprov_free_syncop( sm->sm_op );
1322                 op->o_tmpfree( sm, op->o_tmpmemctx );
1323         }
1324
1325         /* Remove op from lock table */
1326         mt = opc->smt;
1327         if ( mt ) {
1328                 modinst *mi = mt->mt_mods;
1329
1330                 /* If there are more, promote the next one */
1331                 if ( mi->mi_next ) {
1332                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1333                         mt->mt_mods = mi->mi_next;
1334                         mt->mt_op = mt->mt_mods->mi_op;
1335                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1336                 } else {
1337                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1338                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1339                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1340                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1341                         ch_free( mt );
1342                 }
1343         }
1344         if ( !BER_BVISNULL( &opc->suuid ))
1345                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1346         if ( !BER_BVISNULL( &opc->sndn ))
1347                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1348         if ( !BER_BVISNULL( &opc->sdn ))
1349                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1350         op->o_callback = cb->sc_next;
1351         op->o_tmpfree(cb, op->o_tmpmemctx);
1352
1353         return 0;
1354 }
1355
1356 static void
1357 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1358 {
1359         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1360         Modifications mod;
1361         Operation opm;
1362         SlapReply rsm = { 0 };
1363         slap_callback cb = {0};
1364         BackendDB be;
1365 #ifdef CHECK_CSN
1366         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1367
1368         int i;
1369         for ( i=0; i<si->si_numcsns; i++ ) {
1370                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1371         }
1372 #endif
1373         mod.sml_numvals = si->si_numcsns;
1374         mod.sml_values = si->si_ctxcsn;
1375         mod.sml_nvalues = NULL;
1376         mod.sml_desc = slap_schema.si_ad_contextCSN;
1377         mod.sml_op = LDAP_MOD_REPLACE;
1378         mod.sml_flags = SLAP_MOD_INTERNAL;
1379         mod.sml_next = NULL;
1380
1381         cb.sc_response = slap_null_cb;
1382         opm = *op;
1383         opm.o_tag = LDAP_REQ_MODIFY;
1384         opm.o_callback = &cb;
1385         opm.orm_modlist = &mod;
1386         opm.orm_no_opattrs = 1;
1387         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1388                 be = *on->on_info->oi_origdb;
1389                 opm.o_bd = &be;
1390         }
1391         opm.o_req_dn = opm.o_bd->be_suffix[0];
1392         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1393         opm.o_bd->bd_info = on->on_info->oi_orig;
1394         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1395         opm.o_no_schema_check = 1;
1396         opm.o_bd->be_modify( &opm, &rsm );
1397         if ( mod.sml_next != NULL ) {
1398                 slap_mods_free( mod.sml_next, 1 );
1399         }
1400 #ifdef CHECK_CSN
1401         for ( i=0; i<si->si_numcsns; i++ ) {
1402                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1403         }
1404 #endif
1405 }
1406
1407 static void
1408 syncprov_add_slog( Operation *op )
1409 {
1410         opcookie *opc = op->o_callback->sc_private;
1411         slap_overinst *on = opc->son;
1412         syncprov_info_t         *si = on->on_bi.bi_private;
1413         sessionlog *sl;
1414         slog_entry *se;
1415
1416         sl = si->si_logs;
1417         {
1418                 /* Allocate a record. UUIDs are not NUL-terminated. */
1419                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1420                         op->o_csn.bv_len + 1 );
1421                 se->se_next = NULL;
1422                 se->se_tag = op->o_tag;
1423
1424                 se->se_uuid.bv_val = (char *)(&se[1]);
1425                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1426                 se->se_uuid.bv_len = opc->suuid.bv_len;
1427
1428                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1429                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1430                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1431                 se->se_csn.bv_len = op->o_csn.bv_len;
1432                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1433
1434                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1435                 if ( sl->sl_head ) {
1436                         sl->sl_tail->se_next = se;
1437                 } else {
1438                         sl->sl_head = se;
1439                 }
1440                 sl->sl_tail = se;
1441                 sl->sl_num++;
1442                 while ( sl->sl_num > sl->sl_size ) {
1443                         se = sl->sl_head;
1444                         sl->sl_head = se->se_next;
1445                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1446                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1447                         ch_free( se );
1448                         sl->sl_num--;
1449                 }
1450                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1451         }
1452 }
1453
1454 /* Just set a flag if we found the matching entry */
1455 static int
1456 playlog_cb( Operation *op, SlapReply *rs )
1457 {
1458         if ( rs->sr_type == REP_SEARCH ) {
1459                 op->o_callback->sc_private = (void *)1;
1460         }
1461         return rs->sr_err;
1462 }
1463
1464 /* enter with sl->sl_mutex locked, release before returning */
1465 static void
1466 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1467         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1468 {
1469         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1470         slog_entry *se;
1471         int i, j, ndel, num, nmods, mmods;
1472         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1473         BerVarray uuids;
1474         struct berval delcsn[2];
1475
1476         if ( !sl->sl_num ) {
1477                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1478                 return;
1479         }
1480
1481         num = sl->sl_num;
1482         i = 0;
1483         nmods = 0;
1484
1485         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1486                 num * UUID_LEN, op->o_tmpmemctx );
1487         uuids[0].bv_val = (char *)(uuids + num + 1);
1488
1489         delcsn[0].bv_len = 0;
1490         delcsn[0].bv_val = cbuf;
1491         BER_BVZERO(&delcsn[1]);
1492
1493         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1494          * and everything else at the end. Do this first so we can
1495          * unlock the list mutex.
1496          */
1497         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1498                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1499         for ( se=sl->sl_head; se; se=se->se_next ) {
1500                 int k;
1501                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1502                 ndel = 1;
1503                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1504                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1505                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1506                                 break;
1507                         }
1508                 }
1509                 if ( ndel <= 0 ) {
1510                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1511                         continue;
1512                 }
1513                 ndel = 0;
1514                 for ( k=0; k<numcsns; k++ ) {
1515                         if ( se->se_sid == sids[k] ) {
1516                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1517                                 break;
1518                         }
1519                 }
1520                 if ( ndel > 0 ) {
1521                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1522                         break;
1523                 }
1524                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1525                         j = i;
1526                         i++;
1527                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1528                         delcsn[0].bv_len = se->se_csn.bv_len;
1529                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1530                 } else {
1531                         nmods++;
1532                         j = num - nmods;
1533                 }
1534                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1535                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1536                 uuids[j].bv_len = UUID_LEN;
1537         }
1538         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1539
1540         ndel = i;
1541
1542         /* Zero out unused slots */
1543         for ( i=ndel; i < num - nmods; i++ )
1544                 uuids[i].bv_len = 0;
1545
1546         /* Mods must be validated to see if they belong in this delete set.
1547          */
1548
1549         mmods = nmods;
1550         /* Strip any duplicates */
1551         for ( i=0; i<nmods; i++ ) {
1552                 for ( j=0; j<ndel; j++ ) {
1553                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1554                                 uuids[num - 1 - i].bv_len = 0;
1555                                 mmods --;
1556                                 break;
1557                         }
1558                 }
1559                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1560                 for ( j=0; j<i; j++ ) {
1561                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1562                                 uuids[num - 1 - i].bv_len = 0;
1563                                 mmods --;
1564                                 break;
1565                         }
1566                 }
1567         }
1568
1569         if ( mmods ) {
1570                 Operation fop;
1571                 SlapReply frs = { REP_RESULT };
1572                 int rc;
1573                 Filter mf, af;
1574                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1575                 slap_callback cb = {0};
1576
1577                 fop = *op;
1578
1579                 fop.o_sync_mode = 0;
1580                 fop.o_callback = &cb;
1581                 fop.ors_limit = NULL;
1582                 fop.ors_tlimit = SLAP_NO_LIMIT;
1583                 fop.ors_attrs = slap_anlist_all_attributes;
1584                 fop.ors_attrsonly = 0;
1585                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1586
1587                 af.f_choice = LDAP_FILTER_AND;
1588                 af.f_next = NULL;
1589                 af.f_and = &mf;
1590                 mf.f_choice = LDAP_FILTER_EQUALITY;
1591                 mf.f_ava = &eq;
1592                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1593                 mf.f_next = fop.ors_filter;
1594
1595                 fop.ors_filter = &af;
1596
1597                 cb.sc_response = playlog_cb;
1598                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1599
1600                 for ( i=ndel; i<num; i++ ) {
1601                         if ( uuids[i].bv_len == 0 ) continue;
1602
1603                         mf.f_av_value = uuids[i];
1604                         cb.sc_private = NULL;
1605                         fop.ors_slimit = 1;
1606                         frs.sr_nentries = 0;
1607                         rc = fop.o_bd->be_search( &fop, &frs );
1608
1609                         /* If entry was not found, add to delete list */
1610                         if ( !cb.sc_private ) {
1611                                 uuids[ndel++] = uuids[i];
1612                         }
1613                 }
1614                 fop.o_bd->bd_info = (BackendInfo *)on;
1615         }
1616         if ( ndel ) {
1617                 struct berval cookie;
1618
1619                 if ( delcsn[0].bv_len ) {
1620                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1621                                 slap_serverID ? slap_serverID : -1 );
1622
1623                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1624                 }
1625
1626                 uuids[ndel].bv_val = NULL;
1627                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1628                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1629                 if ( delcsn[0].bv_len ) {
1630                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1631                 }
1632         }
1633         op->o_tmpfree( uuids, op->o_tmpmemctx );
1634 }
1635
1636 static int
1637 syncprov_op_response( Operation *op, SlapReply *rs )
1638 {
1639         opcookie *opc = op->o_callback->sc_private;
1640         slap_overinst *on = opc->son;
1641         syncprov_info_t         *si = on->on_bi.bi_private;
1642         syncmatches *sm;
1643
1644         if ( rs->sr_err == LDAP_SUCCESS )
1645         {
1646                 struct berval maxcsn;
1647                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1648                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1649
1650                 /* Update our context CSN */
1651                 cbuf[0] = '\0';
1652                 maxcsn.bv_val = cbuf;
1653                 maxcsn.bv_len = sizeof(cbuf);
1654                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1655
1656                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1657                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1658                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1659                         /* Catch contextCSN updates from syncrepl. We have to look at
1660                          * all the attribute values, as there may be more than one csn
1661                          * that changed, and only one can be passed in the csn queue.
1662                          */
1663                         Modifications *mod = op->orm_modlist;
1664                         int i, j, sid;
1665
1666                         for ( i=0; i<mod->sml_numvals; i++ ) {
1667                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1668
1669                                 for ( j=0; j<si->si_numcsns; j++ ) {
1670                                         if ( sid == si->si_sids[j] ) {
1671                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1672                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1673                                                         csn_changed = 1;
1674                                                 }
1675                                                 break;
1676                                         }
1677                                 }
1678
1679                                 if ( j == si->si_numcsns ) {
1680                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1681                                         si->si_numcsns++;
1682                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1683                                                 sizeof(int));
1684                                         si->si_sids[j] = sid;
1685                                         csn_changed = 1;
1686                                 }
1687                         }
1688                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1689
1690                         if ( csn_changed ) {
1691                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1692                                 have_psearches = ( si->si_ops != NULL );
1693                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1694
1695                                 if ( have_psearches ) {
1696                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1697                                                 if ( sm->sm_op->s_op->o_abandon )
1698                                                         continue;
1699                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1700                                         }
1701                                 }
1702                         }
1703                         return SLAP_CB_CONTINUE;
1704                 }
1705
1706                 slap_get_commit_csn( op, &maxcsn, &foundit );
1707                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1708                         /* syncrepl queues the CSN values in the db where
1709                          * it is configured , not where the changes are made.
1710                          * So look for a value in the glue db if we didn't
1711                          * find any in this db.
1712                          */
1713                         BackendDB *be = op->o_bd;
1714                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1715                         maxcsn.bv_val = cbuf;
1716                         maxcsn.bv_len = sizeof(cbuf);
1717                         slap_get_commit_csn( op, &maxcsn, &foundit );
1718                         op->o_bd = be;
1719                 }
1720                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1721                         int i, sid;
1722 #ifdef CHECK_CSN
1723                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1724                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1725 #endif
1726                         sid = slap_parse_csn_sid( &maxcsn );
1727                         for ( i=0; i<si->si_numcsns; i++ ) {
1728                                 if ( sid == si->si_sids[i] ) {
1729                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1730                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1731                                                 csn_changed = 1;
1732                                         }
1733                                         break;
1734                                 }
1735                         }
1736                         /* It's a new SID for us */
1737                         if ( i == si->si_numcsns ) {
1738                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1739                                 csn_changed = 1;
1740                                 si->si_numcsns++;
1741                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1742                                         sizeof(int));
1743                                 si->si_sids[i] = sid;
1744                         }
1745 #if 0
1746                 } else if ( !foundit ) {
1747                         /* internal ops that aren't meant to be replicated */
1748                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1749                         return SLAP_CB_CONTINUE;
1750 #endif
1751                 }
1752
1753                 /* Don't do any processing for consumer contextCSN updates */
1754                 if ( op->o_dont_replicate ) {
1755                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1756                         return SLAP_CB_CONTINUE;
1757                 }
1758
1759                 si->si_numops++;
1760                 if ( si->si_chkops || si->si_chktime ) {
1761                         /* Never checkpoint adding the context entry,
1762                          * it will deadlock
1763                          */
1764                         if ( op->o_tag != LDAP_REQ_ADD ||
1765                                 !dn_match( &op->o_req_ndn, &op->o_bd->be_nsuffix[0] )) {
1766                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1767                                         do_check = 1;
1768                                         si->si_numops = 0;
1769                                 }
1770                                 if ( si->si_chktime &&
1771                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1772                                         if ( si->si_chklast ) {
1773                                                 do_check = 1;
1774                                                 si->si_chklast = op->o_time;
1775                                         } else {
1776                                                 si->si_chklast = 1;
1777                                         }
1778                                 }
1779                         }
1780                 }
1781                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1782
1783                 if ( do_check ) {
1784                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1785                         syncprov_checkpoint( op, rs, on );
1786                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1787                 }
1788
1789                 /* only update consumer ctx if this is a newer csn */
1790                 if ( csn_changed ) {
1791                         opc->sctxcsn = maxcsn;
1792                 }
1793
1794                 /* Handle any persistent searches */
1795                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1796                 have_psearches = ( si->si_ops != NULL );
1797                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1798                 if ( have_psearches ) {
1799                         switch(op->o_tag) {
1800                         case LDAP_REQ_ADD:
1801                         case LDAP_REQ_MODIFY:
1802                         case LDAP_REQ_MODRDN:
1803                         case LDAP_REQ_EXTENDED:
1804                                 syncprov_matchops( op, opc, 0 );
1805                                 break;
1806                         case LDAP_REQ_DELETE:
1807                                 /* for each match in opc->smatches:
1808                                  *   send DELETE msg
1809                                  */
1810                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1811                                         if ( sm->sm_op->s_op->o_abandon )
1812                                                 continue;
1813                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1814                                 }
1815                                 break;
1816                         }
1817                 }
1818
1819                 /* Add any log records */
1820                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1821                         syncprov_add_slog( op );
1822                 }
1823
1824         }
1825         return SLAP_CB_CONTINUE;
1826 }
1827
1828 /* We don't use a subentry to store the context CSN any more.
1829  * We expose the current context CSN as an operational attribute
1830  * of the suffix entry.
1831  */
1832 static int
1833 syncprov_op_compare( Operation *op, SlapReply *rs )
1834 {
1835         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1836         syncprov_info_t         *si = on->on_bi.bi_private;
1837         int rc = SLAP_CB_CONTINUE;
1838
1839         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1840                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1841         {
1842                 Entry e = {0};
1843                 Attribute a = {0};
1844
1845                 e.e_name = op->o_bd->be_suffix[0];
1846                 e.e_nname = op->o_bd->be_nsuffix[0];
1847                 e.e_attrs = &a;
1848
1849                 a.a_desc = slap_schema.si_ad_contextCSN;
1850
1851                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1852
1853                 a.a_vals = si->si_ctxcsn;
1854                 a.a_nvals = a.a_vals;
1855                 a.a_numvals = si->si_numcsns;
1856
1857                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1858                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1859                 if ( ! rs->sr_err ) {
1860                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1861                         goto return_results;
1862                 }
1863
1864                 if ( get_assert( op ) &&
1865                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1866                 {
1867                         rs->sr_err = LDAP_ASSERTION_FAILED;
1868                         goto return_results;
1869                 }
1870
1871
1872                 rs->sr_err = LDAP_COMPARE_FALSE;
1873
1874                 if ( attr_valfind( &a,
1875                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1876                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1877                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1878                 {
1879                         rs->sr_err = LDAP_COMPARE_TRUE;
1880                 }
1881
1882 return_results:;
1883
1884                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1885
1886                 send_ldap_result( op, rs );
1887
1888                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1889                         rs->sr_err = LDAP_SUCCESS;
1890                 }
1891                 rc = rs->sr_err;
1892         }
1893
1894         return rc;
1895 }
1896
1897 static int
1898 syncprov_op_mod( Operation *op, SlapReply *rs )
1899 {
1900         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1901         syncprov_info_t         *si = on->on_bi.bi_private;
1902         slap_callback *cb;
1903         opcookie *opc;
1904         int have_psearches, cbsize;
1905
1906         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1907         have_psearches = ( si->si_ops != NULL );
1908         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1909
1910         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1911                 (have_psearches ? sizeof(modinst) : 0 );
1912
1913         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1914         opc = (opcookie *)(cb+1);
1915         opc->son = on;
1916         cb->sc_response = syncprov_op_response;
1917         cb->sc_cleanup = syncprov_op_cleanup;
1918         cb->sc_private = opc;
1919         cb->sc_next = op->o_callback;
1920         op->o_callback = cb;
1921
1922         opc->osid = -1;
1923         opc->rsid = -1;
1924         if ( op->o_csn.bv_val ) {
1925                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1926         }
1927         if ( op->o_controls ) {
1928                 struct sync_cookie *scook =
1929                 op->o_controls[slap_cids.sc_LDAPsync];
1930                 if ( scook )
1931                         opc->rsid = scook->sid;
1932         }
1933
1934         /* If there are active persistent searches, lock this operation.
1935          * See seqmod.c for the locking logic on its own.
1936          */
1937         if ( have_psearches ) {
1938                 modtarget *mt, mtdummy;
1939                 modinst *mi;
1940
1941                 mi = (modinst *)(opc+1);
1942                 mi->mi_op = op;
1943
1944                 /* See if we're already modifying this entry... */
1945                 mtdummy.mt_op = op;
1946                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1947                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1948                 if ( mt ) {
1949                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1950                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1951                         mt->mt_tail->mi_next = mi;
1952                         mt->mt_tail = mi;
1953                         /* wait for this op to get to head of list */
1954                         while ( mt->mt_mods != mi ) {
1955                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1956                                 /* FIXME: if dynamic config can delete overlays or
1957                                  * databases we'll have to check for cleanup here.
1958                                  * Currently it's not an issue because there are
1959                                  * no dynamic config deletes...
1960                                  */
1961                                 if ( slapd_shutdown )
1962                                         return SLAPD_ABANDON;
1963
1964                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1965                                         ldap_pvt_thread_yield();
1966                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1967
1968                                 /* clean up if the caller is giving up */
1969                                 if ( op->o_abandon ) {
1970                                         modinst *m2;
1971                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1972                                                 m2 = m2->mi_next );
1973                                         m2->mi_next = mi->mi_next;
1974                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1975                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1976                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1977                                         return SLAPD_ABANDON;
1978                                 }
1979                         }
1980                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1981                 } else {
1982                         /* Record that we're modifying this entry now */
1983                         mt = ch_malloc( sizeof(modtarget) );
1984                         mt->mt_mods = mi;
1985                         mt->mt_tail = mi;
1986                         mt->mt_op = mi->mi_op;
1987                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1988                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1989                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1990                 }
1991                 opc->smt = mt;
1992         }
1993
1994         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1995                 syncprov_matchops( op, opc, 1 );
1996
1997         return SLAP_CB_CONTINUE;
1998 }
1999
2000 static int
2001 syncprov_op_extended( Operation *op, SlapReply *rs )
2002 {
2003         if ( exop_is_write( op ))
2004                 return syncprov_op_mod( op, rs );
2005
2006         return SLAP_CB_CONTINUE;
2007 }
2008
2009 typedef struct searchstate {
2010         slap_overinst *ss_on;
2011         syncops *ss_so;
2012         BerVarray ss_ctxcsn;
2013         int *ss_sids;
2014         int ss_numcsns;
2015 #define SS_PRESENT      0x01
2016 #define SS_CHANGED      0x02
2017         int ss_flags;
2018 } searchstate;
2019
2020 static int
2021 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2022 {
2023         if ( rs->sr_ctrls ) {
2024                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2025                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2026                 rs->sr_ctrls = NULL;
2027         }
2028         return 0;
2029 }
2030
2031 typedef struct SyncOperationBuffer {
2032         Operation               sob_op;
2033         Opheader                sob_hdr;
2034         OpExtra                 sob_oe;
2035         AttributeName   sob_extra;      /* not always present */
2036         /* Further data allocated here */
2037 } SyncOperationBuffer;
2038
2039 static void
2040 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2041 {
2042         SyncOperationBuffer *sopbuf2;
2043         Operation *op2;
2044         int i, alen = 0;
2045         size_t size;
2046         char *ptr;
2047         GroupAssertion *g1, *g2;
2048
2049         /* count the search attrs */
2050         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2051                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2052         }
2053         /* Make a new copy of the operation */
2054         size = offsetof( SyncOperationBuffer, sob_extra ) +
2055                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2056                 op->o_req_dn.bv_len + 1 +
2057                 op->o_req_ndn.bv_len + 1 +
2058                 op->o_ndn.bv_len + 1 +
2059                 so->s_filterstr.bv_len + 1;
2060         sopbuf2 = ch_calloc( 1, size );
2061         op2 = &sopbuf2->sob_op;
2062         op2->o_hdr = &sopbuf2->sob_hdr;
2063         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2064
2065         /* Copy the fields we care about explicitly, leave the rest alone */
2066         *op2->o_hdr = *op->o_hdr;
2067         op2->o_tag = op->o_tag;
2068         op2->o_time = op->o_time;
2069         op2->o_bd = on->on_info->oi_origdb;
2070         op2->o_request = op->o_request;
2071         op2->o_managedsait = op->o_managedsait;
2072         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2073         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2074
2075         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2076         if ( i ) {
2077                 op2->ors_attrs = (AttributeName *) ptr;
2078                 ptr = (char *) &op2->ors_attrs[i+1];
2079                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2080                         op2->ors_attrs[i] = op->ors_attrs[i];
2081                         op2->ors_attrs[i].an_name.bv_val = ptr;
2082                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2083                 }
2084                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2085         }
2086
2087         op2->o_authz = op->o_authz;
2088         op2->o_ndn.bv_val = ptr;
2089         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2090         op2->o_dn = op2->o_ndn;
2091         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2092         op2->o_req_dn.bv_val = ptr;
2093         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2094         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2095         op2->o_req_ndn.bv_val = ptr;
2096         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2097         op2->ors_filterstr.bv_val = ptr;
2098         strcpy( ptr, so->s_filterstr.bv_val );
2099         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2100
2101         /* Skip the AND/GE clause that we stuck on in front */
2102         if ( so->s_flags & PS_FIX_FILTER ) {
2103                 op2->ors_filter = op->ors_filter->f_and->f_next;
2104                 so->s_flags ^= PS_FIX_FILTER;
2105         } else {
2106                 op2->ors_filter = op->ors_filter;
2107         }
2108         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2109         so->s_op = op2;
2110
2111         /* Copy any cached group ACLs individually */
2112         op2->o_groups = NULL;
2113         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2114                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2115                 *g2 = *g1;
2116                 strcpy( g2->ga_ndn, g1->ga_ndn );
2117                 g2->ga_next = op2->o_groups;
2118                 op2->o_groups = g2;
2119         }
2120         /* Don't allow any further group caching */
2121         op2->o_do_not_cache = 1;
2122
2123         /* Add op2 to conn so abandon will find us */
2124         op->o_conn->c_n_ops_executing++;
2125         op->o_conn->c_n_ops_completed--;
2126         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2127         so->s_flags |= PS_IS_DETACHED;
2128
2129         /* Prevent anyone else from trying to send a result for this op */
2130         op->o_abandon = 1;
2131 }
2132
2133 static int
2134 syncprov_search_response( Operation *op, SlapReply *rs )
2135 {
2136         searchstate *ss = op->o_callback->sc_private;
2137         slap_overinst *on = ss->ss_on;
2138         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2139         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2140
2141         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2142                 Attribute *a;
2143                 /* If we got a referral without a referral object, there's
2144                  * something missing that we cannot replicate. Just ignore it.
2145                  * The consumer will abort because we didn't send the expected
2146                  * control.
2147                  */
2148                 if ( !rs->sr_entry ) {
2149                         assert( rs->sr_entry != NULL );
2150                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2151                         return SLAP_CB_CONTINUE;
2152                 }
2153                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2154                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2155                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2156                 }
2157                 if ( a ) {
2158                         int i, sid;
2159                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2160
2161                         /* Don't send changed entries back to the originator */
2162                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2163                                 Debug( LDAP_DEBUG_SYNC,
2164                                         "Entry %s changed by peer, ignored\n",
2165                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2166                                 return LDAP_SUCCESS;
2167                         }
2168
2169                         /* If not a persistent search */
2170                         if ( !ss->ss_so ) {
2171                                 /* Make sure entry is less than the snapshot'd contextCSN */
2172                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2173                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2174                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2175                                                 Debug( LDAP_DEBUG_SYNC,
2176                                                         "Entry %s CSN %s greater than snapshot %s\n",
2177                                                         rs->sr_entry->e_name.bv_val,
2178                                                         a->a_nvals[0].bv_val,
2179                                                         ss->ss_ctxcsn[i].bv_val );
2180                                                 return LDAP_SUCCESS;
2181                                         }
2182                                 }
2183                         }
2184
2185                         /* Don't send old entries twice */
2186                         if ( srs->sr_state.ctxcsn ) {
2187                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2188                                         if ( sid == srs->sr_state.sids[i] &&
2189                                                 ber_bvcmp( &a->a_nvals[0],
2190                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2191                                                 Debug( LDAP_DEBUG_SYNC,
2192                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2193                                                         rs->sr_entry->e_name.bv_val,
2194                                                         a->a_nvals[0].bv_val,
2195                                                         srs->sr_state.ctxcsn[i].bv_val );
2196                                                 return LDAP_SUCCESS;
2197                                         }
2198                                 }
2199                         }
2200                 }
2201                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2202                         op->o_tmpmemctx );
2203                 rs->sr_ctrls[1] = NULL;
2204                 /* If we're in delta-sync mode, always send a cookie */
2205                 if ( si->si_nopres && si->si_usehint && a ) {
2206                         struct berval cookie;
2207                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2208                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2209                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2210                 } else {
2211                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2212                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2213                 }
2214         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2215                 struct berval cookie = BER_BVNULL;
2216
2217                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2218                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2219                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2220                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2221
2222                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2223                 }
2224
2225                 /* Is this a regular refresh?
2226                  * Note: refresh never gets here if there were no changes
2227                  */
2228                 if ( !ss->ss_so ) {
2229                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2230                                 op->o_tmpmemctx );
2231                         rs->sr_ctrls[1] = NULL;
2232                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2233                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2234                                         LDAP_SYNC_REFRESH_DELETES );
2235                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2236                 } else {
2237                 /* It's RefreshAndPersist, transition to Persist phase */
2238                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2239                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2240                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2241                                 1, NULL, 0 );
2242                         if ( !BER_BVISNULL( &cookie ))
2243                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2244
2245                         /* Detach this Op from frontend control */
2246                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2247
2248                         /* But not if this connection was closed along the way */
2249                         if ( op->o_abandon ) {
2250                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2251                                 /* syncprov_ab_cleanup will free this syncop */
2252                                 return SLAPD_ABANDON;
2253
2254                         } else {
2255                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2256                                 /* Turn off the refreshing flag */
2257                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2258
2259                                 syncprov_detach_op( op, ss->ss_so, on );
2260
2261                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2262
2263                                 /* If there are queued responses, fire them off */
2264                                 if ( ss->ss_so->s_res )
2265                                         syncprov_qstart( ss->ss_so );
2266                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2267                         }
2268
2269                         return LDAP_SUCCESS;
2270                 }
2271         }
2272
2273         return SLAP_CB_CONTINUE;
2274 }
2275
2276 static int
2277 syncprov_op_search( Operation *op, SlapReply *rs )
2278 {
2279         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2280         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2281         slap_callback   *cb;
2282         int gotstate = 0, changed = 0, do_present = 0;
2283         syncops *sop = NULL;
2284         searchstate *ss;
2285         sync_control *srs;
2286         BerVarray ctxcsn;
2287         int i, *sids, numcsns;
2288         struct berval mincsn;
2289
2290         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2291
2292         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2293                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2294                 return rs->sr_err;
2295         }
2296
2297         srs = op->o_controls[slap_cids.sc_LDAPsync];
2298
2299         /* If this is a persistent search, set it up right away */
2300         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2301                 syncops so = {0};
2302                 fbase_cookie fc;
2303                 opcookie opc;
2304                 slap_callback sc;
2305
2306                 fc.fss = &so;
2307                 fc.fbase = 0;
2308                 so.s_eid = NOID;
2309                 so.s_op = op;
2310                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2311                 /* syncprov_findbase expects to be called as a callback... */
2312                 sc.sc_private = &opc;
2313                 opc.son = on;
2314                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2315                 cb = op->o_callback;
2316                 op->o_callback = &sc;
2317                 rs->sr_err = syncprov_findbase( op, &fc );
2318                 op->o_callback = cb;
2319                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2320
2321                 if ( rs->sr_err != LDAP_SUCCESS ) {
2322                         send_ldap_result( op, rs );
2323                         return rs->sr_err;
2324                 }
2325                 sop = ch_malloc( sizeof( syncops ));
2326                 *sop = so;
2327                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2328                 sop->s_rid = srs->sr_state.rid;
2329                 sop->s_sid = srs->sr_state.sid;
2330                 sop->s_inuse = 1;
2331
2332                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2333                 sop->s_next = si->si_ops;
2334                 si->si_ops = sop;
2335                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2336         }
2337
2338         /* snapshot the ctxcsn */
2339         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2340         numcsns = si->si_numcsns;
2341         if ( numcsns ) {
2342                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2343                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2344                 for ( i=0; i<numcsns; i++ )
2345                         sids[i] = si->si_sids[i];
2346         } else {
2347                 ctxcsn = NULL;
2348                 sids = NULL;
2349         }
2350         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2351
2352         /* If we have a cookie, handle the PRESENT lookups */
2353         if ( srs->sr_state.ctxcsn ) {
2354                 sessionlog *sl;
2355                 int i, j;
2356
2357                 /* If we don't have any CSN of our own yet, pretend nothing
2358                  * has changed.
2359                  */
2360                 if ( !numcsns )
2361                         goto no_change;
2362
2363                 if ( !si->si_nopres )
2364                         do_present = SS_PRESENT;
2365
2366                 /* If there are SIDs we don't recognize in the cookie, drop them */
2367                 for (i=0; i<srs->sr_state.numcsns; ) {
2368                         for (j=0; j<numcsns; j++) {
2369                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2370                                         break;
2371                                 }
2372                         }
2373                         /* not found */
2374                         if ( j == numcsns ) {
2375                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2376                                 j = srs->sr_state.numcsns - 1;
2377                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2378                                 tmp.bv_len = 0;
2379                                 srs->sr_state.ctxcsn[j] = tmp;
2380                                 srs->sr_state.numcsns = j;
2381                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2382                                 continue;
2383                         }
2384                         i++;
2385                 }
2386
2387                 /* Find the smallest CSN */
2388                 mincsn = srs->sr_state.ctxcsn[0];
2389                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2390                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2391                                 mincsn = srs->sr_state.ctxcsn[i];
2392                 }
2393
2394                 /* If nothing has changed, shortcut it */
2395                 if ( srs->sr_state.numcsns == numcsns ) {
2396                         int i, j, newer;
2397                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2398                                 for ( j=0; j<numcsns; j++ ) {
2399                                         if ( srs->sr_state.sids[i] != sids[j] )
2400                                                 continue;
2401                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2402                                         /* If our state is newer, tell consumer about changes */
2403                                         if ( newer < 0 )
2404                                                 changed = SS_CHANGED;
2405                                         else if ( newer > 0 ) {
2406                                         /* our state is older, tell consumer nothing */
2407                                                 if ( sop ) {
2408                                                         syncops **sp = &si->si_ops;
2409
2410                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2411                                                         while ( *sp != sop )
2412                                                                 sp = &(*sp)->s_next;
2413                                                         *sp = sop->s_next;
2414                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2415                                                         ch_free( sop );
2416                                                 }
2417                                                 rs->sr_err = LDAP_SUCCESS;
2418                                                 rs->sr_ctrls = NULL;
2419                                                 send_ldap_result( op, rs );
2420                                                 return rs->sr_err;
2421                                         }
2422                                         break;
2423                                 }
2424                                 if ( changed )
2425                                         break;
2426                         }
2427                         if ( !changed ) {
2428                                 do_present = 0;
2429 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2430                                         LDAPControl     *ctrls[2];
2431
2432                                         ctrls[0] = NULL;
2433                                         ctrls[1] = NULL;
2434                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2435                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2436                                         rs->sr_ctrls = ctrls;
2437                                         rs->sr_err = LDAP_SUCCESS;
2438                                         send_ldap_result( op, rs );
2439                                         rs->sr_ctrls = NULL;
2440                                         return rs->sr_err;
2441                                 }
2442                                 goto shortcut;
2443                         }
2444                 } else {
2445                         /* consumer doesn't have the right number of CSNs */
2446                         changed = SS_CHANGED;
2447                 }
2448                 /* Do we have a sessionlog for this search? */
2449                 sl=si->si_logs;
2450                 if ( sl ) {
2451                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2452                         /* Are there any log entries, and is the consumer state
2453                          * present in the session log?
2454                          */
2455                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2456                                 do_present = 0;
2457                                 /* mutex is unlocked in playlog */
2458                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2459                         } else {
2460                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2461                         }
2462                 }
2463                 /* Is the CSN still present in the database? */
2464                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2465                         /* No, so a reload is required */
2466                         /* the 2.2 consumer doesn't send this hint */
2467                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2468                                 if ( ctxcsn )
2469                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2470                                 if ( sids )
2471                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2472                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2473                                 return rs->sr_err;
2474                         }
2475                         if ( srs->sr_state.ctxcsn ) {
2476                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2477                                 srs->sr_state.ctxcsn = NULL;
2478                         }
2479                         if ( srs->sr_state.sids ) {
2480                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2481                                 srs->sr_state.sids = NULL;
2482                         }
2483                         srs->sr_state.numcsns = 0;
2484                 } else {
2485                         gotstate = 1;
2486                         /* If changed and doing Present lookup, send Present UUIDs */
2487                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2488                                 LDAP_SUCCESS ) {
2489                                 if ( ctxcsn )
2490                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2491                                 if ( sids )
2492                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2493                                 send_ldap_result( op, rs );
2494                                 return rs->sr_err;
2495                         }
2496                 }
2497         } else {
2498                 /* No consumer state, assume something has changed */
2499                 changed = SS_CHANGED;
2500         }
2501
2502 shortcut:
2503         /* Append CSN range to search filter, save original filter
2504          * for persistent search evaluation
2505          */
2506         if ( sop ) {
2507                 sop->s_filterstr= op->ors_filterstr;
2508         }
2509
2510         /* If something changed, find the changes */
2511         if ( gotstate && changed ) {
2512                 Filter *fand, *fava;
2513
2514                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2515                 fand->f_choice = LDAP_FILTER_AND;
2516                 fand->f_next = NULL;
2517                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2518                 fand->f_and = fava;
2519                 fava->f_choice = LDAP_FILTER_GE;
2520                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2521                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2522 #ifdef LDAP_COMP_MATCH
2523                 fava->f_ava->aa_cf = NULL;
2524 #endif
2525                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2526                 fava->f_next = op->ors_filter;
2527                 op->ors_filter = fand;
2528                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2529                 if ( sop )
2530                         sop->s_flags |= PS_FIX_FILTER;
2531         }
2532
2533         /* Let our callback add needed info to returned entries */
2534         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2535         ss = (searchstate *)(cb+1);
2536         ss->ss_on = on;
2537         ss->ss_so = sop;
2538         ss->ss_flags = do_present | changed;
2539         ss->ss_ctxcsn = ctxcsn;
2540         ss->ss_numcsns = numcsns;
2541         ss->ss_sids = sids;
2542         cb->sc_response = syncprov_search_response;
2543         cb->sc_cleanup = syncprov_search_cleanup;
2544         cb->sc_private = ss;
2545         cb->sc_next = op->o_callback;
2546         op->o_callback = cb;
2547
2548         /* If this is a persistent search and no changes were reported during
2549          * the refresh phase, just invoke the response callback to transition
2550          * us into persist phase
2551          */
2552         if ( !changed ) {
2553                 rs->sr_err = LDAP_SUCCESS;
2554                 rs->sr_nentries = 0;
2555                 send_ldap_result( op, rs );
2556                 return rs->sr_err;
2557         }
2558         return SLAP_CB_CONTINUE;
2559 }
2560
2561 static int
2562 syncprov_operational(
2563         Operation *op,
2564         SlapReply *rs )
2565 {
2566         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2567         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2568
2569         /* This prevents generating unnecessarily; frontend will strip
2570          * any statically stored copy.
2571          */
2572         if ( op->o_sync != SLAP_CONTROL_NONE )
2573                 return SLAP_CB_CONTINUE;
2574
2575         if ( rs->sr_entry &&
2576                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2577
2578                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2579                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2580                         Attribute *a, **ap = NULL;
2581
2582                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2583                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2584                                         break;
2585                         }
2586
2587                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2588                         if ( si->si_ctxcsn ) {
2589                                 if ( !a ) {
2590                                         for ( ap = &rs->sr_operational_attrs; *ap;
2591                                                 ap=&(*ap)->a_next );
2592
2593                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2594                                         *ap = a;
2595                                 }
2596
2597                                 if ( !ap ) {
2598                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2599                                                 Entry *e = entry_dup( rs->sr_entry );
2600                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2601                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2602                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2603                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2604                                                         entry_free( rs->sr_entry );
2605                                                 }
2606                                                 rs->sr_entry = e;
2607                                                 rs->sr_flags |=
2608                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2609                                                 a = attr_find( rs->sr_entry->e_attrs,
2610                                                         slap_schema.si_ad_contextCSN );
2611                                         }
2612                                         if ( a->a_nvals != a->a_vals ) {
2613                                                 ber_bvarray_free( a->a_nvals );
2614                                         }
2615                                         a->a_nvals = NULL;
2616                                         ber_bvarray_free( a->a_vals );
2617                                         a->a_vals = NULL;
2618                                         a->a_numvals = 0;
2619                                 }
2620                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2621                         }
2622                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2623                 }
2624         }
2625         return SLAP_CB_CONTINUE;
2626 }
2627
2628 enum {
2629         SP_CHKPT = 1,
2630         SP_SESSL,
2631         SP_NOPRES,
2632         SP_USEHINT
2633 };
2634
2635 static ConfigDriver sp_cf_gen;
2636
2637 static ConfigTable spcfg[] = {
2638         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2639                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2640                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2641                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2642         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2643                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2644                         "DESC 'Session log size in ops' "
2645                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2646         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2647                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2648                         "DESC 'Omit Present phase processing' "
2649                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2650         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2651                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2652                         "DESC 'Observe Reload Hint in Request control' "
2653                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2654         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2655 };
2656
2657 static ConfigOCs spocs[] = {
2658         { "( OLcfgOvOc:1.1 "
2659                 "NAME 'olcSyncProvConfig' "
2660                 "DESC 'SyncRepl Provider configuration' "
2661                 "SUP olcOverlayConfig "
2662                 "MAY ( olcSpCheckpoint "
2663                         "$ olcSpSessionlog "
2664                         "$ olcSpNoPresent "
2665                         "$ olcSpReloadHint "
2666                 ") )",
2667                         Cft_Overlay, spcfg },
2668         { NULL, 0, NULL }
2669 };
2670
2671 static int
2672 sp_cf_gen(ConfigArgs *c)
2673 {
2674         slap_overinst           *on = (slap_overinst *)c->bi;
2675         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2676         int rc = 0;
2677
2678         if ( c->op == SLAP_CONFIG_EMIT ) {
2679                 switch ( c->type ) {
2680                 case SP_CHKPT:
2681                         if ( si->si_chkops || si->si_chktime ) {
2682                                 struct berval bv;
2683                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2684                                         "%d %d", si->si_chkops, si->si_chktime );
2685                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2686                                         rc = 1;
2687                                 } else {
2688                                         bv.bv_val = c->cr_msg;
2689                                         value_add_one( &c->rvalue_vals, &bv );
2690                                 }
2691                         } else {
2692                                 rc = 1;
2693                         }
2694                         break;
2695                 case SP_SESSL:
2696                         if ( si->si_logs ) {
2697                                 c->value_int = si->si_logs->sl_size;
2698                         } else {
2699                                 rc = 1;
2700                         }
2701                         break;
2702                 case SP_NOPRES:
2703                         if ( si->si_nopres ) {
2704                                 c->value_int = 1;
2705                         } else {
2706                                 rc = 1;
2707                         }
2708                         break;
2709                 case SP_USEHINT:
2710                         if ( si->si_usehint ) {
2711                                 c->value_int = 1;
2712                         } else {
2713                                 rc = 1;
2714                         }
2715                         break;
2716                 }
2717                 return rc;
2718         } else if ( c->op == LDAP_MOD_DELETE ) {
2719                 switch ( c->type ) {
2720                 case SP_CHKPT:
2721                         si->si_chkops = 0;
2722                         si->si_chktime = 0;
2723                         break;
2724                 case SP_SESSL:
2725                         if ( si->si_logs )
2726                                 si->si_logs->sl_size = 0;
2727                         else
2728                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2729                         break;
2730                 case SP_NOPRES:
2731                         if ( si->si_nopres )
2732                                 si->si_nopres = 0;
2733                         else
2734                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2735                         break;
2736                 case SP_USEHINT:
2737                         if ( si->si_usehint )
2738                                 si->si_usehint = 0;
2739                         else
2740                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2741                         break;
2742                 }
2743                 return rc;
2744         }
2745         switch ( c->type ) {
2746         case SP_CHKPT:
2747                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2748                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2749                                 c->argv[0], c->argv[1] );
2750                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2751                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2752                         return ARG_BAD_CONF;
2753                 }
2754                 if ( si->si_chkops <= 0 ) {
2755                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2756                                 c->argv[0], si->si_chkops );
2757                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2758                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2759                         return ARG_BAD_CONF;
2760                 }
2761                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2762                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2763                                 c->argv[0], c->argv[1] );
2764                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2765                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2766                         return ARG_BAD_CONF;
2767                 }
2768                 if ( si->si_chktime <= 0 ) {
2769                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2770                                 c->argv[0], si->si_chkops );
2771                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2772                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2773                         return ARG_BAD_CONF;
2774                 }
2775                 si->si_chktime *= 60;
2776                 break;
2777         case SP_SESSL: {
2778                 sessionlog *sl;
2779                 int size = c->value_int;
2780
2781                 if ( size < 0 ) {
2782                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2783                                 c->argv[0], size );
2784                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2785                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2786                         return ARG_BAD_CONF;
2787                 }
2788                 sl = si->si_logs;
2789                 if ( !sl ) {
2790                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2791                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2792                         sl->sl_mincsn.bv_len = 0;
2793                         sl->sl_num = 0;
2794                         sl->sl_head = sl->sl_tail = NULL;
2795                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2796                         si->si_logs = sl;
2797                 }
2798                 sl->sl_size = size;
2799                 }
2800                 break;
2801         case SP_NOPRES:
2802                 si->si_nopres = c->value_int;
2803                 break;
2804         case SP_USEHINT:
2805                 si->si_usehint = c->value_int;
2806                 break;
2807         }
2808         return rc;
2809 }
2810
2811 /* ITS#3456 we cannot run this search on the main thread, must use a
2812  * child thread in order to insure we have a big enough stack.
2813  */
2814 static void *
2815 syncprov_db_otask(
2816         void *ptr
2817 )
2818 {
2819         syncprov_findcsn( ptr, FIND_MAXCSN );
2820         return NULL;
2821 }
2822
2823 /* Read any existing contextCSN from the underlying db.
2824  * Then search for any entries newer than that. If no value exists,
2825  * just generate it. Cache whatever result.
2826  */
2827 static int
2828 syncprov_db_open(
2829         BackendDB *be,
2830         ConfigReply *cr
2831 )
2832 {
2833         slap_overinst   *on = (slap_overinst *) be->bd_info;
2834         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2835
2836         Connection conn = { 0 };
2837         OperationBuffer opbuf;
2838         Operation *op;
2839         Entry *e = NULL;
2840         Attribute *a;
2841         int rc;
2842         void *thrctx = NULL;
2843
2844         if ( !SLAP_LASTMOD( be )) {
2845                 Debug( LDAP_DEBUG_ANY,
2846                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2847                 return -1;
2848         }
2849
2850         if ( slapMode & SLAP_TOOL_MODE ) {
2851                 return 0;
2852         }
2853
2854         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2855         if ( rc ) {
2856                 return rc;
2857         }
2858
2859         thrctx = ldap_pvt_thread_pool_context();
2860         connection_fake_init( &conn, &opbuf, thrctx );
2861         op = &opbuf.ob_op;
2862         op->o_bd = be;
2863         op->o_dn = be->be_rootdn;
2864         op->o_ndn = be->be_rootndn;
2865
2866         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2867                 slap_schema.si_ad_contextCSN, 0, &e, on );
2868
2869         if ( e ) {
2870                 ldap_pvt_thread_t tid;
2871
2872                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2873                 if ( a ) {
2874                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2875                         si->si_numcsns = a->a_numvals;
2876                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2877                 }
2878                 overlay_entry_release_ov( op, e, 0, on );
2879                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2880                         op->o_req_dn = be->be_suffix[0];
2881                         op->o_req_ndn = be->be_nsuffix[0];
2882                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2883                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2884                         ldap_pvt_thread_join( tid, NULL );
2885                 }
2886         }
2887
2888         /* Didn't find a contextCSN, should we generate one? */
2889         if ( !si->si_ctxcsn ) {
2890                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2891                 struct berval csn;
2892
2893                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2894                 /* If we're also a consumer, then don't generate anything.
2895                  * Wait for our provider to send it to us, or for a local
2896                  * modify if we have multimaster.
2897                  */
2898                         goto out;
2899                 }
2900                 csn.bv_val = csnbuf;
2901                 csn.bv_len = sizeof( csnbuf );
2902                 slap_get_csn( op, &csn, 0 );
2903                 value_add_one( &si->si_ctxcsn, &csn );
2904                 si->si_numcsns = 1;
2905                 si->si_sids = ch_malloc( sizeof(int) );
2906                 si->si_sids[0] = slap_serverID;
2907
2908                 /* make sure we do a checkpoint on close */
2909                 si->si_numops++;
2910         }
2911
2912 out:
2913         op->o_bd->bd_info = (BackendInfo *)on;
2914         return 0;
2915 }
2916
2917 /* Write the current contextCSN into the underlying db.
2918  */
2919 static int
2920 syncprov_db_close(
2921         BackendDB *be,
2922         ConfigReply *cr
2923 )
2924 {
2925     slap_overinst   *on = (slap_overinst *) be->bd_info;
2926     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2927
2928         if ( slapMode & SLAP_TOOL_MODE ) {
2929                 return 0;
2930         }
2931         if ( si->si_numops ) {
2932                 Connection conn = {0};
2933                 OperationBuffer opbuf;
2934                 Operation *op;
2935                 SlapReply rs = {REP_RESULT};
2936                 void *thrctx;
2937
2938                 thrctx = ldap_pvt_thread_pool_context();
2939                 connection_fake_init( &conn, &opbuf, thrctx );
2940                 op = &opbuf.ob_op;
2941                 op->o_bd = be;
2942                 op->o_dn = be->be_rootdn;
2943                 op->o_ndn = be->be_rootndn;
2944                 syncprov_checkpoint( op, &rs, on );
2945         }
2946
2947     return 0;
2948 }
2949
2950 static int
2951 syncprov_db_init(
2952         BackendDB *be,
2953         ConfigReply *cr
2954 )
2955 {
2956         slap_overinst   *on = (slap_overinst *)be->bd_info;
2957         syncprov_info_t *si;
2958
2959         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2960                 Debug( LDAP_DEBUG_ANY,
2961                         "syncprov must be instantiated within a database.\n",
2962                         0, 0, 0 );
2963                 return 1;
2964         }
2965
2966         si = ch_calloc(1, sizeof(syncprov_info_t));
2967         on->on_bi.bi_private = si;
2968         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2969         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2970         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2971
2972         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2973         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2974         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2975         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2976
2977         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2978         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2979
2980         return 0;
2981 }
2982
2983 static int
2984 syncprov_db_destroy(
2985         BackendDB *be,
2986         ConfigReply *cr
2987 )
2988 {
2989         slap_overinst   *on = (slap_overinst *)be->bd_info;
2990         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2991
2992         if ( si ) {
2993                 if ( si->si_logs ) {
2994                         slog_entry *se = si->si_logs->sl_head;
2995
2996                         while ( se ) {
2997                                 slog_entry *se_next = se->se_next;
2998                                 ch_free( se );
2999                                 se = se_next;
3000                         }
3001
3002                         ch_free( si->si_logs );
3003                 }
3004                 if ( si->si_ctxcsn )
3005                         ber_bvarray_free( si->si_ctxcsn );
3006                 if ( si->si_sids )
3007                         ch_free( si->si_sids );
3008                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3009                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3010                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3011                 ch_free( si );
3012         }
3013
3014         return 0;
3015 }
3016
3017 static int syncprov_parseCtrl (
3018         Operation *op,
3019         SlapReply *rs,
3020         LDAPControl *ctrl )
3021 {
3022         ber_tag_t tag;
3023         BerElementBuffer berbuf;
3024         BerElement *ber = (BerElement *)&berbuf;
3025         ber_int_t mode;
3026         ber_len_t len;
3027         struct berval cookie = BER_BVNULL;
3028         sync_control *sr;
3029         int rhint = 0;
3030
3031         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3032                 rs->sr_text = "Sync control specified multiple times";
3033                 return LDAP_PROTOCOL_ERROR;
3034         }
3035
3036         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3037                 rs->sr_text = "Sync control specified with pagedResults control";
3038                 return LDAP_PROTOCOL_ERROR;
3039         }
3040
3041         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3042                 rs->sr_text = "Sync control value is absent";
3043                 return LDAP_PROTOCOL_ERROR;
3044         }
3045
3046         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3047                 rs->sr_text = "Sync control value is empty";
3048                 return LDAP_PROTOCOL_ERROR;
3049         }
3050
3051         /* Parse the control value
3052          *      syncRequestValue ::= SEQUENCE {
3053          *              mode   ENUMERATED {
3054          *                      -- 0 unused
3055          *                      refreshOnly             (1),
3056          *                      -- 2 reserved
3057          *                      refreshAndPersist       (3)
3058          *              },
3059          *              cookie  syncCookie OPTIONAL
3060          *      }
3061          */
3062
3063         ber_init2( ber, &ctrl->ldctl_value, 0 );
3064
3065         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3066                 rs->sr_text = "Sync control : mode decoding error";
3067                 return LDAP_PROTOCOL_ERROR;
3068         }
3069
3070         switch( mode ) {
3071         case LDAP_SYNC_REFRESH_ONLY:
3072                 mode = SLAP_SYNC_REFRESH;
3073                 break;
3074         case LDAP_SYNC_REFRESH_AND_PERSIST:
3075                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3076                 break;
3077         default:
3078                 rs->sr_text = "Sync control : unknown update mode";
3079                 return LDAP_PROTOCOL_ERROR;
3080         }
3081
3082         tag = ber_peek_tag( ber, &len );
3083
3084         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3085                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3086                         rs->sr_text = "Sync control : cookie decoding error";
3087                         return LDAP_PROTOCOL_ERROR;
3088                 }
3089                 tag = ber_peek_tag( ber, &len );
3090         }
3091         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3092                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3093                         rs->sr_text = "Sync control : rhint decoding error";
3094                         return LDAP_PROTOCOL_ERROR;
3095                 }
3096         }
3097         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3098                         rs->sr_text = "Sync control : decoding error";
3099                         return LDAP_PROTOCOL_ERROR;
3100         }
3101         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3102         sr->sr_rhint = rhint;
3103         if (!BER_BVISNULL(&cookie)) {
3104                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3105                 /* If parse fails, pretend no cookie was sent */
3106                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3107                         sr->sr_state.rid == -1 ) {
3108                         if ( sr->sr_state.ctxcsn ) {
3109                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3110                                 sr->sr_state.ctxcsn = NULL;
3111                         }
3112                         sr->sr_state.numcsns = 0;
3113                 }
3114         }
3115
3116         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3117
3118         op->o_sync = ctrl->ldctl_iscritical
3119                 ? SLAP_CONTROL_CRITICAL
3120                 : SLAP_CONTROL_NONCRITICAL;
3121
3122         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3123
3124         return LDAP_SUCCESS;
3125 }
3126
3127 /* This overlay is set up for dynamic loading via moduleload. For static
3128  * configuration, you'll need to arrange for the slap_overinst to be
3129  * initialized and registered by some other function inside slapd.
3130  */
3131
3132 static slap_overinst            syncprov;
3133
3134 int
3135 syncprov_initialize()
3136 {
3137         int rc;
3138
3139         rc = register_supported_control( LDAP_CONTROL_SYNC,
3140                 SLAP_CTRL_SEARCH, NULL,
3141                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3142         if ( rc != LDAP_SUCCESS ) {
3143                 Debug( LDAP_DEBUG_ANY,
3144                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3145                 return rc;
3146         }
3147
3148         syncprov.on_bi.bi_type = "syncprov";
3149         syncprov.on_bi.bi_db_init = syncprov_db_init;
3150         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3151         syncprov.on_bi.bi_db_open = syncprov_db_open;
3152         syncprov.on_bi.bi_db_close = syncprov_db_close;
3153
3154         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3155         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3156
3157         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3158         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3159         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3160         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3161         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3162         syncprov.on_bi.bi_op_search = syncprov_op_search;
3163         syncprov.on_bi.bi_extended = syncprov_op_extended;
3164         syncprov.on_bi.bi_operational = syncprov_operational;
3165
3166         syncprov.on_bi.bi_cf_ocs = spocs;
3167
3168         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3169
3170         rc = config_register_schema( spcfg, spocs );
3171         if ( rc ) return rc;
3172
3173         return overlay_register( &syncprov );
3174 }
3175
3176 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3177 int
3178 init_module( int argc, char *argv[] )
3179 {
3180         return syncprov_initialize();
3181 }
3182 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3183
3184 #endif /* defined(SLAPD_OVER_SYNCPROV) */