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                 syncmatches *sm;
1186                 int found = 0;
1187
1188                 snext = ss->s_next;
1189                 if ( ss->s_op->o_abandon )
1190                         continue;
1191
1192                 /* First time thru, check for possible skips */
1193                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1194
1195                         /* Don't send ops back to the originator */
1196                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1197                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1198                                         opc->osid, 0, 0 );
1199                                 continue;
1200                         }
1201
1202                         /* Don't send ops back to the messenger */
1203                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1204                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1205                                         opc->rsid, 0, 0 );
1206                                 continue;
1207                         }
1208                 }
1209
1210                 /* validate base */
1211                 fc.fss = ss;
1212                 fc.fbase = 0;
1213                 fc.fscope = 0;
1214
1215                 /* If the base of the search is missing, signal a refresh */
1216                 rc = syncprov_findbase( op, &fc );
1217                 if ( rc != LDAP_SUCCESS ) {
1218                         SlapReply rs = {REP_RESULT};
1219                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1220                                 "search base has changed" );
1221                         sprev->s_next = snext;
1222                         syncprov_drop_psearch( ss, 1 );
1223                         ss = sprev;
1224                         continue;
1225                 }
1226
1227
1228                 /* If we're sending results now, look for this op in old matches */
1229                 if ( !saveit ) {
1230                         syncmatches *old;
1231
1232                         /* Did we modify the search base? */
1233                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1234                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1235                                 ss->s_flags |= PS_WROTE_BASE;
1236                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1237                         }
1238
1239                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1240                                 old=sm, sm=sm->sm_next ) {
1241                                 if ( sm->sm_op == ss ) {
1242                                         found = 1;
1243                                         old->sm_next = sm->sm_next;
1244                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1245                                         break;
1246                                 }
1247                         }
1248                 }
1249
1250                 if ( fc.fscope ) {
1251                         op2 = *ss->s_op;
1252                         oh = *op->o_hdr;
1253                         oh.oh_conn = ss->s_op->o_conn;
1254                         oh.oh_connid = ss->s_op->o_connid;
1255                         op2.o_bd = op->o_bd->bd_self;
1256                         op2.o_hdr = &oh;
1257                         op2.o_extra = op->o_extra;
1258                         op2.o_callback = NULL;
1259                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1260                 }
1261
1262                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1263                         ss->s_sid, fc.fscope, rc );
1264
1265                 /* check if current o_req_dn is in scope and matches filter */
1266                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1267                         if ( saveit ) {
1268                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1269                                 sm->sm_next = opc->smatches;
1270                                 sm->sm_op = ss;
1271                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1272                                 ++ss->s_inuse;
1273                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1274                                 opc->smatches = sm;
1275                         } else {
1276                                 /* if found send UPDATE else send ADD */
1277                                 syncprov_qresp( opc, ss,
1278                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1279                         }
1280                 } else if ( !saveit && found ) {
1281                         /* send DELETE */
1282                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1283                 } else if ( !saveit ) {
1284                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1285                 }
1286                 if ( !saveit && found ) {
1287                         /* Decrement s_inuse, was incremented when called
1288                          * with saveit == TRUE
1289                          */
1290                         syncprov_free_syncop( ss );
1291                 }
1292         }
1293         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1294
1295         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1296                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1297                         op->o_bd = &db;
1298                 }
1299                 overlay_entry_release_ov( op, e, 0, on );
1300                 op->o_bd = b0;
1301         }
1302         if ( freefdn ) {
1303                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1304         }
1305         op->o_bd = b0;
1306 }
1307
1308 static int
1309 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1310 {
1311         slap_callback *cb = op->o_callback;
1312         opcookie *opc = cb->sc_private;
1313         slap_overinst *on = opc->son;
1314         syncprov_info_t         *si = on->on_bi.bi_private;
1315         syncmatches *sm, *snext;
1316         modtarget *mt, mtdummy;
1317
1318         for (sm = opc->smatches; sm; sm=snext) {
1319                 snext = sm->sm_next;
1320                 syncprov_free_syncop( sm->sm_op );
1321                 op->o_tmpfree( sm, op->o_tmpmemctx );
1322         }
1323
1324         /* Remove op from lock table */
1325         mt = opc->smt;
1326         if ( mt ) {
1327                 modinst *mi = mt->mt_mods;
1328
1329                 /* If there are more, promote the next one */
1330                 if ( mi->mi_next ) {
1331                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1332                         mt->mt_mods = mi->mi_next;
1333                         mt->mt_op = mt->mt_mods->mi_op;
1334                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1335                 } else {
1336                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1337                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1338                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1339                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1340                         ch_free( mt );
1341                 }
1342         }
1343         if ( !BER_BVISNULL( &opc->suuid ))
1344                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1345         if ( !BER_BVISNULL( &opc->sndn ))
1346                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1347         if ( !BER_BVISNULL( &opc->sdn ))
1348                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1349         op->o_callback = cb->sc_next;
1350         op->o_tmpfree(cb, op->o_tmpmemctx);
1351
1352         return 0;
1353 }
1354
1355 static void
1356 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1357 {
1358         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1359         Modifications mod;
1360         Operation opm;
1361         SlapReply rsm = { 0 };
1362         slap_callback cb = {0};
1363         BackendDB be;
1364 #ifdef CHECK_CSN
1365         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1366
1367         int i;
1368         for ( i=0; i<si->si_numcsns; i++ ) {
1369                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1370         }
1371 #endif
1372         mod.sml_numvals = si->si_numcsns;
1373         mod.sml_values = si->si_ctxcsn;
1374         mod.sml_nvalues = NULL;
1375         mod.sml_desc = slap_schema.si_ad_contextCSN;
1376         mod.sml_op = LDAP_MOD_REPLACE;
1377         mod.sml_flags = SLAP_MOD_INTERNAL;
1378         mod.sml_next = NULL;
1379
1380         cb.sc_response = slap_null_cb;
1381         opm = *op;
1382         opm.o_tag = LDAP_REQ_MODIFY;
1383         opm.o_callback = &cb;
1384         opm.orm_modlist = &mod;
1385         opm.orm_no_opattrs = 1;
1386         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1387                 be = *on->on_info->oi_origdb;
1388                 opm.o_bd = &be;
1389         }
1390         opm.o_req_dn = opm.o_bd->be_suffix[0];
1391         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1392         opm.o_bd->bd_info = on->on_info->oi_orig;
1393         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1394         opm.o_no_schema_check = 1;
1395         opm.o_bd->be_modify( &opm, &rsm );
1396         if ( mod.sml_next != NULL ) {
1397                 slap_mods_free( mod.sml_next, 1 );
1398         }
1399 #ifdef CHECK_CSN
1400         for ( i=0; i<si->si_numcsns; i++ ) {
1401                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1402         }
1403 #endif
1404 }
1405
1406 static void
1407 syncprov_add_slog( Operation *op )
1408 {
1409         opcookie *opc = op->o_callback->sc_private;
1410         slap_overinst *on = opc->son;
1411         syncprov_info_t         *si = on->on_bi.bi_private;
1412         sessionlog *sl;
1413         slog_entry *se;
1414
1415         sl = si->si_logs;
1416         {
1417                 /* Allocate a record. UUIDs are not NUL-terminated. */
1418                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1419                         op->o_csn.bv_len + 1 );
1420                 se->se_next = NULL;
1421                 se->se_tag = op->o_tag;
1422
1423                 se->se_uuid.bv_val = (char *)(&se[1]);
1424                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1425                 se->se_uuid.bv_len = opc->suuid.bv_len;
1426
1427                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1428                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1429                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1430                 se->se_csn.bv_len = op->o_csn.bv_len;
1431                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1432
1433                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1434                 if ( sl->sl_head ) {
1435                         sl->sl_tail->se_next = se;
1436                 } else {
1437                         sl->sl_head = se;
1438                 }
1439                 sl->sl_tail = se;
1440                 sl->sl_num++;
1441                 while ( sl->sl_num > sl->sl_size ) {
1442                         se = sl->sl_head;
1443                         sl->sl_head = se->se_next;
1444                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1445                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1446                         ch_free( se );
1447                         sl->sl_num--;
1448                 }
1449                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1450         }
1451 }
1452
1453 /* Just set a flag if we found the matching entry */
1454 static int
1455 playlog_cb( Operation *op, SlapReply *rs )
1456 {
1457         if ( rs->sr_type == REP_SEARCH ) {
1458                 op->o_callback->sc_private = (void *)1;
1459         }
1460         return rs->sr_err;
1461 }
1462
1463 /* enter with sl->sl_mutex locked, release before returning */
1464 static void
1465 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1466         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1467 {
1468         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1469         slog_entry *se;
1470         int i, j, ndel, num, nmods, mmods;
1471         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1472         BerVarray uuids;
1473         struct berval delcsn[2];
1474
1475         if ( !sl->sl_num ) {
1476                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1477                 return;
1478         }
1479
1480         num = sl->sl_num;
1481         i = 0;
1482         nmods = 0;
1483
1484         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1485                 num * UUID_LEN, op->o_tmpmemctx );
1486         uuids[0].bv_val = (char *)(uuids + num + 1);
1487
1488         delcsn[0].bv_len = 0;
1489         delcsn[0].bv_val = cbuf;
1490         BER_BVZERO(&delcsn[1]);
1491
1492         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1493          * and everything else at the end. Do this first so we can
1494          * unlock the list mutex.
1495          */
1496         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1497                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1498         for ( se=sl->sl_head; se; se=se->se_next ) {
1499                 int k;
1500                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1501                 ndel = 1;
1502                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1503                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1504                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1505                                 break;
1506                         }
1507                 }
1508                 if ( ndel <= 0 ) {
1509                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1510                         continue;
1511                 }
1512                 ndel = 0;
1513                 for ( k=0; k<numcsns; k++ ) {
1514                         if ( se->se_sid == sids[k] ) {
1515                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1516                                 break;
1517                         }
1518                 }
1519                 if ( ndel > 0 ) {
1520                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1521                         break;
1522                 }
1523                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1524                         j = i;
1525                         i++;
1526                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1527                         delcsn[0].bv_len = se->se_csn.bv_len;
1528                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1529                 } else {
1530                         nmods++;
1531                         j = num - nmods;
1532                 }
1533                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1534                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1535                 uuids[j].bv_len = UUID_LEN;
1536         }
1537         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1538
1539         ndel = i;
1540
1541         /* Zero out unused slots */
1542         for ( i=ndel; i < num - nmods; i++ )
1543                 uuids[i].bv_len = 0;
1544
1545         /* Mods must be validated to see if they belong in this delete set.
1546          */
1547
1548         mmods = nmods;
1549         /* Strip any duplicates */
1550         for ( i=0; i<nmods; i++ ) {
1551                 for ( j=0; j<ndel; j++ ) {
1552                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1553                                 uuids[num - 1 - i].bv_len = 0;
1554                                 mmods --;
1555                                 break;
1556                         }
1557                 }
1558                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1559                 for ( j=0; j<i; j++ ) {
1560                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1561                                 uuids[num - 1 - i].bv_len = 0;
1562                                 mmods --;
1563                                 break;
1564                         }
1565                 }
1566         }
1567
1568         if ( mmods ) {
1569                 Operation fop;
1570                 SlapReply frs = { REP_RESULT };
1571                 int rc;
1572                 Filter mf, af;
1573                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1574                 slap_callback cb = {0};
1575
1576                 fop = *op;
1577
1578                 fop.o_sync_mode = 0;
1579                 fop.o_callback = &cb;
1580                 fop.ors_limit = NULL;
1581                 fop.ors_tlimit = SLAP_NO_LIMIT;
1582                 fop.ors_attrs = slap_anlist_all_attributes;
1583                 fop.ors_attrsonly = 0;
1584                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1585
1586                 af.f_choice = LDAP_FILTER_AND;
1587                 af.f_next = NULL;
1588                 af.f_and = &mf;
1589                 mf.f_choice = LDAP_FILTER_EQUALITY;
1590                 mf.f_ava = &eq;
1591                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1592                 mf.f_next = fop.ors_filter;
1593
1594                 fop.ors_filter = &af;
1595
1596                 cb.sc_response = playlog_cb;
1597                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1598
1599                 for ( i=ndel; i<num; i++ ) {
1600                         if ( uuids[i].bv_len == 0 ) continue;
1601
1602                         mf.f_av_value = uuids[i];
1603                         cb.sc_private = NULL;
1604                         fop.ors_slimit = 1;
1605                         frs.sr_nentries = 0;
1606                         rc = fop.o_bd->be_search( &fop, &frs );
1607
1608                         /* If entry was not found, add to delete list */
1609                         if ( !cb.sc_private ) {
1610                                 uuids[ndel++] = uuids[i];
1611                         }
1612                 }
1613                 fop.o_bd->bd_info = (BackendInfo *)on;
1614         }
1615         if ( ndel ) {
1616                 struct berval cookie;
1617
1618                 if ( delcsn[0].bv_len ) {
1619                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1620                                 slap_serverID ? slap_serverID : -1 );
1621
1622                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1623                 }
1624
1625                 uuids[ndel].bv_val = NULL;
1626                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1627                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1628                 if ( delcsn[0].bv_len ) {
1629                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1630                 }
1631         }
1632         op->o_tmpfree( uuids, op->o_tmpmemctx );
1633 }
1634
1635 static int
1636 syncprov_op_response( Operation *op, SlapReply *rs )
1637 {
1638         opcookie *opc = op->o_callback->sc_private;
1639         slap_overinst *on = opc->son;
1640         syncprov_info_t         *si = on->on_bi.bi_private;
1641         syncmatches *sm;
1642
1643         if ( rs->sr_err == LDAP_SUCCESS )
1644         {
1645                 struct berval maxcsn;
1646                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1647                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1648
1649                 /* Update our context CSN */
1650                 cbuf[0] = '\0';
1651                 maxcsn.bv_val = cbuf;
1652                 maxcsn.bv_len = sizeof(cbuf);
1653                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1654
1655                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1656                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1657                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1658                         /* Catch contextCSN updates from syncrepl. We have to look at
1659                          * all the attribute values, as there may be more than one csn
1660                          * that changed, and only one can be passed in the csn queue.
1661                          */
1662                         Modifications *mod = op->orm_modlist;
1663                         int i, j, sid;
1664
1665                         for ( i=0; i<mod->sml_numvals; i++ ) {
1666                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1667
1668                                 for ( j=0; j<si->si_numcsns; j++ ) {
1669                                         if ( sid == si->si_sids[j] ) {
1670                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1671                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1672                                                         csn_changed = 1;
1673                                                 }
1674                                                 break;
1675                                         }
1676                                 }
1677
1678                                 if ( j == si->si_numcsns ) {
1679                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1680                                         si->si_numcsns++;
1681                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1682                                                 sizeof(int));
1683                                         si->si_sids[j] = sid;
1684                                         csn_changed = 1;
1685                                 }
1686                         }
1687                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1688
1689                         if ( csn_changed ) {
1690                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1691                                 have_psearches = ( si->si_ops != NULL );
1692                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1693
1694                                 if ( have_psearches ) {
1695                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1696                                                 if ( sm->sm_op->s_op->o_abandon )
1697                                                         continue;
1698                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1699                                         }
1700                                 }
1701                         }
1702                         return SLAP_CB_CONTINUE;
1703                 }
1704
1705                 slap_get_commit_csn( op, &maxcsn, &foundit );
1706                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1707                         /* syncrepl queues the CSN values in the db where
1708                          * it is configured , not where the changes are made.
1709                          * So look for a value in the glue db if we didn't
1710                          * find any in this db.
1711                          */
1712                         BackendDB *be = op->o_bd;
1713                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1714                         maxcsn.bv_val = cbuf;
1715                         maxcsn.bv_len = sizeof(cbuf);
1716                         slap_get_commit_csn( op, &maxcsn, &foundit );
1717                         op->o_bd = be;
1718                 }
1719                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1720                         int i, sid;
1721 #ifdef CHECK_CSN
1722                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1723                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1724 #endif
1725                         sid = slap_parse_csn_sid( &maxcsn );
1726                         for ( i=0; i<si->si_numcsns; i++ ) {
1727                                 if ( sid == si->si_sids[i] ) {
1728                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1729                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1730                                                 csn_changed = 1;
1731                                         }
1732                                         break;
1733                                 }
1734                         }
1735                         /* It's a new SID for us */
1736                         if ( i == si->si_numcsns ) {
1737                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1738                                 csn_changed = 1;
1739                                 si->si_numcsns++;
1740                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1741                                         sizeof(int));
1742                                 si->si_sids[i] = sid;
1743                         }
1744 #if 0
1745                 } else if ( !foundit ) {
1746                         /* internal ops that aren't meant to be replicated */
1747                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1748                         return SLAP_CB_CONTINUE;
1749 #endif
1750                 }
1751
1752                 /* Don't do any processing for consumer contextCSN updates */
1753                 if ( op->o_dont_replicate ) {
1754                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1755                         return SLAP_CB_CONTINUE;
1756                 }
1757
1758                 si->si_numops++;
1759                 if ( si->si_chkops || si->si_chktime ) {
1760                         /* Never checkpoint adding the context entry,
1761                          * it will deadlock
1762                          */
1763                         if ( op->o_tag != LDAP_REQ_ADD ||
1764                                 !dn_match( &op->o_req_ndn, &op->o_bd->be_nsuffix[0] )) {
1765                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1766                                         do_check = 1;
1767                                         si->si_numops = 0;
1768                                 }
1769                                 if ( si->si_chktime &&
1770                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1771                                         if ( si->si_chklast ) {
1772                                                 do_check = 1;
1773                                                 si->si_chklast = op->o_time;
1774                                         } else {
1775                                                 si->si_chklast = 1;
1776                                         }
1777                                 }
1778                         }
1779                 }
1780                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1781
1782                 if ( do_check ) {
1783                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1784                         syncprov_checkpoint( op, rs, on );
1785                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1786                 }
1787
1788                 /* only update consumer ctx if this is a newer csn */
1789                 if ( csn_changed ) {
1790                         opc->sctxcsn = maxcsn;
1791                 }
1792
1793                 /* Handle any persistent searches */
1794                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1795                 have_psearches = ( si->si_ops != NULL );
1796                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1797                 if ( have_psearches ) {
1798                         switch(op->o_tag) {
1799                         case LDAP_REQ_ADD:
1800                         case LDAP_REQ_MODIFY:
1801                         case LDAP_REQ_MODRDN:
1802                         case LDAP_REQ_EXTENDED:
1803                                 syncprov_matchops( op, opc, 0 );
1804                                 break;
1805                         case LDAP_REQ_DELETE:
1806                                 /* for each match in opc->smatches:
1807                                  *   send DELETE msg
1808                                  */
1809                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1810                                         if ( sm->sm_op->s_op->o_abandon )
1811                                                 continue;
1812                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1813                                 }
1814                                 break;
1815                         }
1816                 }
1817
1818                 /* Add any log records */
1819                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1820                         syncprov_add_slog( op );
1821                 }
1822
1823         }
1824         return SLAP_CB_CONTINUE;
1825 }
1826
1827 /* We don't use a subentry to store the context CSN any more.
1828  * We expose the current context CSN as an operational attribute
1829  * of the suffix entry.
1830  */
1831 static int
1832 syncprov_op_compare( Operation *op, SlapReply *rs )
1833 {
1834         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1835         syncprov_info_t         *si = on->on_bi.bi_private;
1836         int rc = SLAP_CB_CONTINUE;
1837
1838         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1839                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1840         {
1841                 Entry e = {0};
1842                 Attribute a = {0};
1843
1844                 e.e_name = op->o_bd->be_suffix[0];
1845                 e.e_nname = op->o_bd->be_nsuffix[0];
1846                 e.e_attrs = &a;
1847
1848                 a.a_desc = slap_schema.si_ad_contextCSN;
1849
1850                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1851
1852                 a.a_vals = si->si_ctxcsn;
1853                 a.a_nvals = a.a_vals;
1854                 a.a_numvals = si->si_numcsns;
1855
1856                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1857                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1858                 if ( ! rs->sr_err ) {
1859                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1860                         goto return_results;
1861                 }
1862
1863                 if ( get_assert( op ) &&
1864                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1865                 {
1866                         rs->sr_err = LDAP_ASSERTION_FAILED;
1867                         goto return_results;
1868                 }
1869
1870
1871                 rs->sr_err = LDAP_COMPARE_FALSE;
1872
1873                 if ( attr_valfind( &a,
1874                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1875                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1876                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1877                 {
1878                         rs->sr_err = LDAP_COMPARE_TRUE;
1879                 }
1880
1881 return_results:;
1882
1883                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1884
1885                 send_ldap_result( op, rs );
1886
1887                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1888                         rs->sr_err = LDAP_SUCCESS;
1889                 }
1890                 rc = rs->sr_err;
1891         }
1892
1893         return rc;
1894 }
1895
1896 static int
1897 syncprov_op_mod( Operation *op, SlapReply *rs )
1898 {
1899         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1900         syncprov_info_t         *si = on->on_bi.bi_private;
1901         slap_callback *cb;
1902         opcookie *opc;
1903         int have_psearches, cbsize;
1904
1905         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1906         have_psearches = ( si->si_ops != NULL );
1907         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1908
1909         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1910                 (have_psearches ? sizeof(modinst) : 0 );
1911
1912         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1913         opc = (opcookie *)(cb+1);
1914         opc->son = on;
1915         cb->sc_response = syncprov_op_response;
1916         cb->sc_cleanup = syncprov_op_cleanup;
1917         cb->sc_private = opc;
1918         cb->sc_next = op->o_callback;
1919         op->o_callback = cb;
1920
1921         opc->osid = -1;
1922         opc->rsid = -1;
1923         if ( op->o_csn.bv_val ) {
1924                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1925         }
1926         if ( op->o_controls ) {
1927                 struct sync_cookie *scook =
1928                 op->o_controls[slap_cids.sc_LDAPsync];
1929                 if ( scook )
1930                         opc->rsid = scook->sid;
1931         }
1932
1933         /* If there are active persistent searches, lock this operation.
1934          * See seqmod.c for the locking logic on its own.
1935          */
1936         if ( have_psearches ) {
1937                 modtarget *mt, mtdummy;
1938                 modinst *mi;
1939
1940                 mi = (modinst *)(opc+1);
1941                 mi->mi_op = op;
1942
1943                 /* See if we're already modifying this entry... */
1944                 mtdummy.mt_op = op;
1945                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1946                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1947                 if ( mt ) {
1948                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1949                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1950                         mt->mt_tail->mi_next = mi;
1951                         mt->mt_tail = mi;
1952                         /* wait for this op to get to head of list */
1953                         while ( mt->mt_mods != mi ) {
1954                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1955                                 /* FIXME: if dynamic config can delete overlays or
1956                                  * databases we'll have to check for cleanup here.
1957                                  * Currently it's not an issue because there are
1958                                  * no dynamic config deletes...
1959                                  */
1960                                 if ( slapd_shutdown )
1961                                         return SLAPD_ABANDON;
1962
1963                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1964                                         ldap_pvt_thread_yield();
1965                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1966
1967                                 /* clean up if the caller is giving up */
1968                                 if ( op->o_abandon ) {
1969                                         modinst *m2;
1970                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1971                                                 m2 = m2->mi_next );
1972                                         m2->mi_next = mi->mi_next;
1973                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1974                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1975                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1976                                         return SLAPD_ABANDON;
1977                                 }
1978                         }
1979                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1980                 } else {
1981                         /* Record that we're modifying this entry now */
1982                         mt = ch_malloc( sizeof(modtarget) );
1983                         mt->mt_mods = mi;
1984                         mt->mt_tail = mi;
1985                         mt->mt_op = mi->mi_op;
1986                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1987                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1988                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1989                 }
1990                 opc->smt = mt;
1991         }
1992
1993         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1994                 syncprov_matchops( op, opc, 1 );
1995
1996         return SLAP_CB_CONTINUE;
1997 }
1998
1999 static int
2000 syncprov_op_extended( Operation *op, SlapReply *rs )
2001 {
2002         if ( exop_is_write( op ))
2003                 return syncprov_op_mod( op, rs );
2004
2005         return SLAP_CB_CONTINUE;
2006 }
2007
2008 typedef struct searchstate {
2009         slap_overinst *ss_on;
2010         syncops *ss_so;
2011         BerVarray ss_ctxcsn;
2012         int *ss_sids;
2013         int ss_numcsns;
2014 #define SS_PRESENT      0x01
2015 #define SS_CHANGED      0x02
2016         int ss_flags;
2017 } searchstate;
2018
2019 static int
2020 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2021 {
2022         if ( rs->sr_ctrls ) {
2023                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2024                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2025                 rs->sr_ctrls = NULL;
2026         }
2027         return 0;
2028 }
2029
2030 typedef struct SyncOperationBuffer {
2031         Operation               sob_op;
2032         Opheader                sob_hdr;
2033         OpExtra                 sob_oe;
2034         AttributeName   sob_extra;      /* not always present */
2035         /* Further data allocated here */
2036 } SyncOperationBuffer;
2037
2038 static void
2039 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2040 {
2041         SyncOperationBuffer *sopbuf2;
2042         Operation *op2;
2043         int i, alen = 0;
2044         size_t size;
2045         char *ptr;
2046         GroupAssertion *g1, *g2;
2047
2048         /* count the search attrs */
2049         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2050                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2051         }
2052         /* Make a new copy of the operation */
2053         size = offsetof( SyncOperationBuffer, sob_extra ) +
2054                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2055                 op->o_req_dn.bv_len + 1 +
2056                 op->o_req_ndn.bv_len + 1 +
2057                 op->o_ndn.bv_len + 1 +
2058                 so->s_filterstr.bv_len + 1;
2059         sopbuf2 = ch_calloc( 1, size );
2060         op2 = &sopbuf2->sob_op;
2061         op2->o_hdr = &sopbuf2->sob_hdr;
2062         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2063
2064         /* Copy the fields we care about explicitly, leave the rest alone */
2065         *op2->o_hdr = *op->o_hdr;
2066         op2->o_tag = op->o_tag;
2067         op2->o_time = op->o_time;
2068         op2->o_bd = on->on_info->oi_origdb;
2069         op2->o_request = op->o_request;
2070         op2->o_managedsait = op->o_managedsait;
2071         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2072         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2073
2074         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2075         if ( i ) {
2076                 op2->ors_attrs = (AttributeName *) ptr;
2077                 ptr = (char *) &op2->ors_attrs[i+1];
2078                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2079                         op2->ors_attrs[i] = op->ors_attrs[i];
2080                         op2->ors_attrs[i].an_name.bv_val = ptr;
2081                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2082                 }
2083                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2084         }
2085
2086         op2->o_authz = op->o_authz;
2087         op2->o_ndn.bv_val = ptr;
2088         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2089         op2->o_dn = op2->o_ndn;
2090         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2091         op2->o_req_dn.bv_val = ptr;
2092         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2093         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2094         op2->o_req_ndn.bv_val = ptr;
2095         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2096         op2->ors_filterstr.bv_val = ptr;
2097         strcpy( ptr, so->s_filterstr.bv_val );
2098         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2099
2100         /* Skip the AND/GE clause that we stuck on in front */
2101         if ( so->s_flags & PS_FIX_FILTER ) {
2102                 op2->ors_filter = op->ors_filter->f_and->f_next;
2103                 so->s_flags ^= PS_FIX_FILTER;
2104         } else {
2105                 op2->ors_filter = op->ors_filter;
2106         }
2107         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2108         so->s_op = op2;
2109
2110         /* Copy any cached group ACLs individually */
2111         op2->o_groups = NULL;
2112         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2113                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2114                 *g2 = *g1;
2115                 strcpy( g2->ga_ndn, g1->ga_ndn );
2116                 g2->ga_next = op2->o_groups;
2117                 op2->o_groups = g2;
2118         }
2119         /* Don't allow any further group caching */
2120         op2->o_do_not_cache = 1;
2121
2122         /* Add op2 to conn so abandon will find us */
2123         op->o_conn->c_n_ops_executing++;
2124         op->o_conn->c_n_ops_completed--;
2125         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2126         so->s_flags |= PS_IS_DETACHED;
2127
2128         /* Prevent anyone else from trying to send a result for this op */
2129         op->o_abandon = 1;
2130 }
2131
2132 static int
2133 syncprov_search_response( Operation *op, SlapReply *rs )
2134 {
2135         searchstate *ss = op->o_callback->sc_private;
2136         slap_overinst *on = ss->ss_on;
2137         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2138         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2139
2140         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2141                 Attribute *a;
2142                 /* If we got a referral without a referral object, there's
2143                  * something missing that we cannot replicate. Just ignore it.
2144                  * The consumer will abort because we didn't send the expected
2145                  * control.
2146                  */
2147                 if ( !rs->sr_entry ) {
2148                         assert( rs->sr_entry != NULL );
2149                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2150                         return SLAP_CB_CONTINUE;
2151                 }
2152                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2153                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2154                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2155                 }
2156                 if ( a ) {
2157                         int i, sid;
2158                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2159
2160                         /* Don't send changed entries back to the originator */
2161                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2162                                 Debug( LDAP_DEBUG_SYNC,
2163                                         "Entry %s changed by peer, ignored\n",
2164                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2165                                 return LDAP_SUCCESS;
2166                         }
2167
2168                         /* If not a persistent search */
2169                         if ( !ss->ss_so ) {
2170                                 /* Make sure entry is less than the snapshot'd contextCSN */
2171                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2172                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2173                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2174                                                 Debug( LDAP_DEBUG_SYNC,
2175                                                         "Entry %s CSN %s greater than snapshot %s\n",
2176                                                         rs->sr_entry->e_name.bv_val,
2177                                                         a->a_nvals[0].bv_val,
2178                                                         ss->ss_ctxcsn[i].bv_val );
2179                                                 return LDAP_SUCCESS;
2180                                         }
2181                                 }
2182                         }
2183
2184                         /* Don't send old entries twice */
2185                         if ( srs->sr_state.ctxcsn ) {
2186                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2187                                         if ( sid == srs->sr_state.sids[i] &&
2188                                                 ber_bvcmp( &a->a_nvals[0],
2189                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2190                                                 Debug( LDAP_DEBUG_SYNC,
2191                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2192                                                         rs->sr_entry->e_name.bv_val,
2193                                                         a->a_nvals[0].bv_val,
2194                                                         srs->sr_state.ctxcsn[i].bv_val );
2195                                                 return LDAP_SUCCESS;
2196                                         }
2197                                 }
2198                         }
2199                 }
2200                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2201                         op->o_tmpmemctx );
2202                 rs->sr_ctrls[1] = NULL;
2203                 /* If we're in delta-sync mode, always send a cookie */
2204                 if ( si->si_nopres && si->si_usehint && a ) {
2205                         struct berval cookie;
2206                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2207                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2208                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2209                 } else {
2210                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2211                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2212                 }
2213         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2214                 struct berval cookie = BER_BVNULL;
2215
2216                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2217                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2218                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2219                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2220
2221                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2222                 }
2223
2224                 /* Is this a regular refresh?
2225                  * Note: refresh never gets here if there were no changes
2226                  */
2227                 if ( !ss->ss_so ) {
2228                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2229                                 op->o_tmpmemctx );
2230                         rs->sr_ctrls[1] = NULL;
2231                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2232                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2233                                         LDAP_SYNC_REFRESH_DELETES );
2234                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2235                 } else {
2236                 /* It's RefreshAndPersist, transition to Persist phase */
2237                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2238                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2239                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2240                                 1, NULL, 0 );
2241                         if ( !BER_BVISNULL( &cookie ))
2242                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2243
2244                         /* Detach this Op from frontend control */
2245                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2246
2247                         /* But not if this connection was closed along the way */
2248                         if ( op->o_abandon ) {
2249                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2250                                 /* syncprov_ab_cleanup will free this syncop */
2251                                 return SLAPD_ABANDON;
2252
2253                         } else {
2254                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2255                                 /* Turn off the refreshing flag */
2256                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2257
2258                                 syncprov_detach_op( op, ss->ss_so, on );
2259
2260                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2261
2262                                 /* If there are queued responses, fire them off */
2263                                 if ( ss->ss_so->s_res )
2264                                         syncprov_qstart( ss->ss_so );
2265                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2266                         }
2267
2268                         return LDAP_SUCCESS;
2269                 }
2270         }
2271
2272         return SLAP_CB_CONTINUE;
2273 }
2274
2275 static int
2276 syncprov_op_search( Operation *op, SlapReply *rs )
2277 {
2278         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2279         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2280         slap_callback   *cb;
2281         int gotstate = 0, changed = 0, do_present = 0;
2282         syncops *sop = NULL;
2283         searchstate *ss;
2284         sync_control *srs;
2285         BerVarray ctxcsn;
2286         int i, *sids, numcsns;
2287         struct berval mincsn;
2288
2289         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2290
2291         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2292                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2293                 return rs->sr_err;
2294         }
2295
2296         srs = op->o_controls[slap_cids.sc_LDAPsync];
2297
2298         /* If this is a persistent search, set it up right away */
2299         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2300                 syncops so = {0};
2301                 fbase_cookie fc;
2302                 opcookie opc;
2303                 slap_callback sc;
2304
2305                 fc.fss = &so;
2306                 fc.fbase = 0;
2307                 so.s_eid = NOID;
2308                 so.s_op = op;
2309                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2310                 /* syncprov_findbase expects to be called as a callback... */
2311                 sc.sc_private = &opc;
2312                 opc.son = on;
2313                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2314                 cb = op->o_callback;
2315                 op->o_callback = &sc;
2316                 rs->sr_err = syncprov_findbase( op, &fc );
2317                 op->o_callback = cb;
2318                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2319
2320                 if ( rs->sr_err != LDAP_SUCCESS ) {
2321                         send_ldap_result( op, rs );
2322                         return rs->sr_err;
2323                 }
2324                 sop = ch_malloc( sizeof( syncops ));
2325                 *sop = so;
2326                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2327                 sop->s_rid = srs->sr_state.rid;
2328                 sop->s_sid = srs->sr_state.sid;
2329                 sop->s_inuse = 1;
2330
2331                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2332                 sop->s_next = si->si_ops;
2333                 si->si_ops = sop;
2334                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2335         }
2336
2337         /* snapshot the ctxcsn */
2338         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2339         numcsns = si->si_numcsns;
2340         if ( numcsns ) {
2341                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2342                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2343                 for ( i=0; i<numcsns; i++ )
2344                         sids[i] = si->si_sids[i];
2345         } else {
2346                 ctxcsn = NULL;
2347                 sids = NULL;
2348         }
2349         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2350
2351         /* If we have a cookie, handle the PRESENT lookups */
2352         if ( srs->sr_state.ctxcsn ) {
2353                 sessionlog *sl;
2354                 int i, j;
2355
2356                 /* If we don't have any CSN of our own yet, pretend nothing
2357                  * has changed.
2358                  */
2359                 if ( !numcsns )
2360                         goto no_change;
2361
2362                 if ( !si->si_nopres )
2363                         do_present = SS_PRESENT;
2364
2365                 /* If there are SIDs we don't recognize in the cookie, drop them */
2366                 for (i=0; i<srs->sr_state.numcsns; ) {
2367                         for (j=0; j<numcsns; j++) {
2368                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2369                                         break;
2370                                 }
2371                         }
2372                         /* not found */
2373                         if ( j == numcsns ) {
2374                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2375                                 j = srs->sr_state.numcsns - 1;
2376                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2377                                 tmp.bv_len = 0;
2378                                 srs->sr_state.ctxcsn[j] = tmp;
2379                                 srs->sr_state.numcsns = j;
2380                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2381                                 continue;
2382                         }
2383                         i++;
2384                 }
2385
2386                 /* Find the smallest CSN */
2387                 mincsn = srs->sr_state.ctxcsn[0];
2388                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2389                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2390                                 mincsn = srs->sr_state.ctxcsn[i];
2391                 }
2392
2393                 /* If nothing has changed, shortcut it */
2394                 if ( srs->sr_state.numcsns == numcsns ) {
2395                         int i, j, newer;
2396                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2397                                 for ( j=0; j<numcsns; j++ ) {
2398                                         if ( srs->sr_state.sids[i] != sids[j] )
2399                                                 continue;
2400                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2401                                         /* If our state is newer, tell consumer about changes */
2402                                         if ( newer < 0 )
2403                                                 changed = SS_CHANGED;
2404                                         else if ( newer > 0 ) {
2405                                         /* our state is older, tell consumer nothing */
2406                                                 if ( sop ) {
2407                                                         syncops **sp = &si->si_ops;
2408
2409                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2410                                                         while ( *sp != sop )
2411                                                                 sp = &(*sp)->s_next;
2412                                                         *sp = sop->s_next;
2413                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2414                                                         ch_free( sop );
2415                                                 }
2416                                                 rs->sr_err = LDAP_SUCCESS;
2417                                                 rs->sr_ctrls = NULL;
2418                                                 send_ldap_result( op, rs );
2419                                                 return rs->sr_err;
2420                                         }
2421                                         break;
2422                                 }
2423                                 if ( changed )
2424                                         break;
2425                         }
2426                         if ( !changed ) {
2427                                 do_present = 0;
2428 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2429                                         LDAPControl     *ctrls[2];
2430
2431                                         ctrls[0] = NULL;
2432                                         ctrls[1] = NULL;
2433                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2434                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2435                                         rs->sr_ctrls = ctrls;
2436                                         rs->sr_err = LDAP_SUCCESS;
2437                                         send_ldap_result( op, rs );
2438                                         rs->sr_ctrls = NULL;
2439                                         return rs->sr_err;
2440                                 }
2441                                 goto shortcut;
2442                         }
2443                 } else {
2444                         /* consumer doesn't have the right number of CSNs */
2445                         changed = SS_CHANGED;
2446                 }
2447                 /* Do we have a sessionlog for this search? */
2448                 sl=si->si_logs;
2449                 if ( sl ) {
2450                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2451                         /* Are there any log entries, and is the consumer state
2452                          * present in the session log?
2453                          */
2454                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2455                                 do_present = 0;
2456                                 /* mutex is unlocked in playlog */
2457                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2458                         } else {
2459                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2460                         }
2461                 }
2462                 /* Is the CSN still present in the database? */
2463                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2464                         /* No, so a reload is required */
2465                         /* the 2.2 consumer doesn't send this hint */
2466                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2467                                 if ( ctxcsn )
2468                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2469                                 if ( sids )
2470                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2471                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2472                                 return rs->sr_err;
2473                         }
2474                         if ( srs->sr_state.ctxcsn ) {
2475                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2476                                 srs->sr_state.ctxcsn = NULL;
2477                         }
2478                         if ( srs->sr_state.sids ) {
2479                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2480                                 srs->sr_state.sids = NULL;
2481                         }
2482                         srs->sr_state.numcsns = 0;
2483                 } else {
2484                         gotstate = 1;
2485                         /* If changed and doing Present lookup, send Present UUIDs */
2486                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2487                                 LDAP_SUCCESS ) {
2488                                 if ( ctxcsn )
2489                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2490                                 if ( sids )
2491                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2492                                 send_ldap_result( op, rs );
2493                                 return rs->sr_err;
2494                         }
2495                 }
2496         } else {
2497                 /* No consumer state, assume something has changed */
2498                 changed = SS_CHANGED;
2499         }
2500
2501 shortcut:
2502         /* Append CSN range to search filter, save original filter
2503          * for persistent search evaluation
2504          */
2505         if ( sop ) {
2506                 sop->s_filterstr= op->ors_filterstr;
2507         }
2508
2509         /* If something changed, find the changes */
2510         if ( gotstate && changed ) {
2511                 Filter *fand, *fava;
2512
2513                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2514                 fand->f_choice = LDAP_FILTER_AND;
2515                 fand->f_next = NULL;
2516                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2517                 fand->f_and = fava;
2518                 fava->f_choice = LDAP_FILTER_GE;
2519                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2520                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2521 #ifdef LDAP_COMP_MATCH
2522                 fava->f_ava->aa_cf = NULL;
2523 #endif
2524                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2525                 fava->f_next = op->ors_filter;
2526                 op->ors_filter = fand;
2527                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2528                 if ( sop )
2529                         sop->s_flags |= PS_FIX_FILTER;
2530         }
2531
2532         /* Let our callback add needed info to returned entries */
2533         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2534         ss = (searchstate *)(cb+1);
2535         ss->ss_on = on;
2536         ss->ss_so = sop;
2537         ss->ss_flags = do_present | changed;
2538         ss->ss_ctxcsn = ctxcsn;
2539         ss->ss_numcsns = numcsns;
2540         ss->ss_sids = sids;
2541         cb->sc_response = syncprov_search_response;
2542         cb->sc_cleanup = syncprov_search_cleanup;
2543         cb->sc_private = ss;
2544         cb->sc_next = op->o_callback;
2545         op->o_callback = cb;
2546
2547         /* If this is a persistent search and no changes were reported during
2548          * the refresh phase, just invoke the response callback to transition
2549          * us into persist phase
2550          */
2551         if ( !changed ) {
2552                 rs->sr_err = LDAP_SUCCESS;
2553                 rs->sr_nentries = 0;
2554                 send_ldap_result( op, rs );
2555                 return rs->sr_err;
2556         }
2557         return SLAP_CB_CONTINUE;
2558 }
2559
2560 static int
2561 syncprov_operational(
2562         Operation *op,
2563         SlapReply *rs )
2564 {
2565         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2566         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2567
2568         /* This prevents generating unnecessarily; frontend will strip
2569          * any statically stored copy.
2570          */
2571         if ( op->o_sync != SLAP_CONTROL_NONE )
2572                 return SLAP_CB_CONTINUE;
2573
2574         if ( rs->sr_entry &&
2575                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2576
2577                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2578                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2579                         Attribute *a, **ap = NULL;
2580
2581                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2582                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2583                                         break;
2584                         }
2585
2586                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2587                         if ( si->si_ctxcsn ) {
2588                                 if ( !a ) {
2589                                         for ( ap = &rs->sr_operational_attrs; *ap;
2590                                                 ap=&(*ap)->a_next );
2591
2592                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2593                                         *ap = a;
2594                                 }
2595
2596                                 if ( !ap ) {
2597                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2598                                                 Entry *e = entry_dup( rs->sr_entry );
2599                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2600                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2601                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2602                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2603                                                         entry_free( rs->sr_entry );
2604                                                 }
2605                                                 rs->sr_entry = e;
2606                                                 rs->sr_flags |=
2607                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2608                                                 a = attr_find( rs->sr_entry->e_attrs,
2609                                                         slap_schema.si_ad_contextCSN );
2610                                         }
2611                                         if ( a->a_nvals != a->a_vals ) {
2612                                                 ber_bvarray_free( a->a_nvals );
2613                                         }
2614                                         a->a_nvals = NULL;
2615                                         ber_bvarray_free( a->a_vals );
2616                                         a->a_vals = NULL;
2617                                         a->a_numvals = 0;
2618                                 }
2619                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2620                         }
2621                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2622                 }
2623         }
2624         return SLAP_CB_CONTINUE;
2625 }
2626
2627 enum {
2628         SP_CHKPT = 1,
2629         SP_SESSL,
2630         SP_NOPRES,
2631         SP_USEHINT
2632 };
2633
2634 static ConfigDriver sp_cf_gen;
2635
2636 static ConfigTable spcfg[] = {
2637         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2638                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2639                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2640                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2641         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2642                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2643                         "DESC 'Session log size in ops' "
2644                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2645         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2646                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2647                         "DESC 'Omit Present phase processing' "
2648                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2649         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2650                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2651                         "DESC 'Observe Reload Hint in Request control' "
2652                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2653         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2654 };
2655
2656 static ConfigOCs spocs[] = {
2657         { "( OLcfgOvOc:1.1 "
2658                 "NAME 'olcSyncProvConfig' "
2659                 "DESC 'SyncRepl Provider configuration' "
2660                 "SUP olcOverlayConfig "
2661                 "MAY ( olcSpCheckpoint "
2662                         "$ olcSpSessionlog "
2663                         "$ olcSpNoPresent "
2664                         "$ olcSpReloadHint "
2665                 ") )",
2666                         Cft_Overlay, spcfg },
2667         { NULL, 0, NULL }
2668 };
2669
2670 static int
2671 sp_cf_gen(ConfigArgs *c)
2672 {
2673         slap_overinst           *on = (slap_overinst *)c->bi;
2674         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2675         int rc = 0;
2676
2677         if ( c->op == SLAP_CONFIG_EMIT ) {
2678                 switch ( c->type ) {
2679                 case SP_CHKPT:
2680                         if ( si->si_chkops || si->si_chktime ) {
2681                                 struct berval bv;
2682                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2683                                         "%d %d", si->si_chkops, si->si_chktime );
2684                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2685                                         rc = 1;
2686                                 } else {
2687                                         bv.bv_val = c->cr_msg;
2688                                         value_add_one( &c->rvalue_vals, &bv );
2689                                 }
2690                         } else {
2691                                 rc = 1;
2692                         }
2693                         break;
2694                 case SP_SESSL:
2695                         if ( si->si_logs ) {
2696                                 c->value_int = si->si_logs->sl_size;
2697                         } else {
2698                                 rc = 1;
2699                         }
2700                         break;
2701                 case SP_NOPRES:
2702                         if ( si->si_nopres ) {
2703                                 c->value_int = 1;
2704                         } else {
2705                                 rc = 1;
2706                         }
2707                         break;
2708                 case SP_USEHINT:
2709                         if ( si->si_usehint ) {
2710                                 c->value_int = 1;
2711                         } else {
2712                                 rc = 1;
2713                         }
2714                         break;
2715                 }
2716                 return rc;
2717         } else if ( c->op == LDAP_MOD_DELETE ) {
2718                 switch ( c->type ) {
2719                 case SP_CHKPT:
2720                         si->si_chkops = 0;
2721                         si->si_chktime = 0;
2722                         break;
2723                 case SP_SESSL:
2724                         if ( si->si_logs )
2725                                 si->si_logs->sl_size = 0;
2726                         else
2727                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2728                         break;
2729                 case SP_NOPRES:
2730                         if ( si->si_nopres )
2731                                 si->si_nopres = 0;
2732                         else
2733                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2734                         break;
2735                 case SP_USEHINT:
2736                         if ( si->si_usehint )
2737                                 si->si_usehint = 0;
2738                         else
2739                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2740                         break;
2741                 }
2742                 return rc;
2743         }
2744         switch ( c->type ) {
2745         case SP_CHKPT:
2746                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2747                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2748                                 c->argv[0], c->argv[1] );
2749                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2750                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2751                         return ARG_BAD_CONF;
2752                 }
2753                 if ( si->si_chkops <= 0 ) {
2754                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2755                                 c->argv[0], si->si_chkops );
2756                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2757                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2758                         return ARG_BAD_CONF;
2759                 }
2760                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2761                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2762                                 c->argv[0], c->argv[1] );
2763                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2764                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2765                         return ARG_BAD_CONF;
2766                 }
2767                 if ( si->si_chktime <= 0 ) {
2768                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2769                                 c->argv[0], si->si_chkops );
2770                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2771                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2772                         return ARG_BAD_CONF;
2773                 }
2774                 si->si_chktime *= 60;
2775                 break;
2776         case SP_SESSL: {
2777                 sessionlog *sl;
2778                 int size = c->value_int;
2779
2780                 if ( size < 0 ) {
2781                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2782                                 c->argv[0], size );
2783                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2784                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2785                         return ARG_BAD_CONF;
2786                 }
2787                 sl = si->si_logs;
2788                 if ( !sl ) {
2789                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2790                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2791                         sl->sl_mincsn.bv_len = 0;
2792                         sl->sl_num = 0;
2793                         sl->sl_head = sl->sl_tail = NULL;
2794                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2795                         si->si_logs = sl;
2796                 }
2797                 sl->sl_size = size;
2798                 }
2799                 break;
2800         case SP_NOPRES:
2801                 si->si_nopres = c->value_int;
2802                 break;
2803         case SP_USEHINT:
2804                 si->si_usehint = c->value_int;
2805                 break;
2806         }
2807         return rc;
2808 }
2809
2810 /* ITS#3456 we cannot run this search on the main thread, must use a
2811  * child thread in order to insure we have a big enough stack.
2812  */
2813 static void *
2814 syncprov_db_otask(
2815         void *ptr
2816 )
2817 {
2818         syncprov_findcsn( ptr, FIND_MAXCSN );
2819         return NULL;
2820 }
2821
2822 /* Read any existing contextCSN from the underlying db.
2823  * Then search for any entries newer than that. If no value exists,
2824  * just generate it. Cache whatever result.
2825  */
2826 static int
2827 syncprov_db_open(
2828         BackendDB *be,
2829         ConfigReply *cr
2830 )
2831 {
2832         slap_overinst   *on = (slap_overinst *) be->bd_info;
2833         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2834
2835         Connection conn = { 0 };
2836         OperationBuffer opbuf;
2837         Operation *op;
2838         Entry *e = NULL;
2839         Attribute *a;
2840         int rc;
2841         void *thrctx = NULL;
2842
2843         if ( !SLAP_LASTMOD( be )) {
2844                 Debug( LDAP_DEBUG_ANY,
2845                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2846                 return -1;
2847         }
2848
2849         if ( slapMode & SLAP_TOOL_MODE ) {
2850                 return 0;
2851         }
2852
2853         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2854         if ( rc ) {
2855                 return rc;
2856         }
2857
2858         thrctx = ldap_pvt_thread_pool_context();
2859         connection_fake_init( &conn, &opbuf, thrctx );
2860         op = &opbuf.ob_op;
2861         op->o_bd = be;
2862         op->o_dn = be->be_rootdn;
2863         op->o_ndn = be->be_rootndn;
2864
2865         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2866                 slap_schema.si_ad_contextCSN, 0, &e, on );
2867
2868         if ( e ) {
2869                 ldap_pvt_thread_t tid;
2870
2871                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2872                 if ( a ) {
2873                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2874                         si->si_numcsns = a->a_numvals;
2875                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2876                 }
2877                 overlay_entry_release_ov( op, e, 0, on );
2878                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2879                         op->o_req_dn = be->be_suffix[0];
2880                         op->o_req_ndn = be->be_nsuffix[0];
2881                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2882                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2883                         ldap_pvt_thread_join( tid, NULL );
2884                 }
2885         }
2886
2887         /* Didn't find a contextCSN, should we generate one? */
2888         if ( !si->si_ctxcsn ) {
2889                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2890                 struct berval csn;
2891
2892                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2893                 /* If we're also a consumer, then don't generate anything.
2894                  * Wait for our provider to send it to us, or for a local
2895                  * modify if we have multimaster.
2896                  */
2897                         goto out;
2898                 }
2899                 csn.bv_val = csnbuf;
2900                 csn.bv_len = sizeof( csnbuf );
2901                 slap_get_csn( op, &csn, 0 );
2902                 value_add_one( &si->si_ctxcsn, &csn );
2903                 si->si_numcsns = 1;
2904                 si->si_sids = ch_malloc( sizeof(int) );
2905                 si->si_sids[0] = slap_serverID;
2906
2907                 /* make sure we do a checkpoint on close */
2908                 si->si_numops++;
2909         }
2910
2911 out:
2912         op->o_bd->bd_info = (BackendInfo *)on;
2913         return 0;
2914 }
2915
2916 /* Write the current contextCSN into the underlying db.
2917  */
2918 static int
2919 syncprov_db_close(
2920         BackendDB *be,
2921         ConfigReply *cr
2922 )
2923 {
2924     slap_overinst   *on = (slap_overinst *) be->bd_info;
2925     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2926
2927         if ( slapMode & SLAP_TOOL_MODE ) {
2928                 return 0;
2929         }
2930         if ( si->si_numops ) {
2931                 Connection conn = {0};
2932                 OperationBuffer opbuf;
2933                 Operation *op;
2934                 SlapReply rs = {REP_RESULT};
2935                 void *thrctx;
2936
2937                 thrctx = ldap_pvt_thread_pool_context();
2938                 connection_fake_init( &conn, &opbuf, thrctx );
2939                 op = &opbuf.ob_op;
2940                 op->o_bd = be;
2941                 op->o_dn = be->be_rootdn;
2942                 op->o_ndn = be->be_rootndn;
2943                 syncprov_checkpoint( op, &rs, on );
2944         }
2945
2946     return 0;
2947 }
2948
2949 static int
2950 syncprov_db_init(
2951         BackendDB *be,
2952         ConfigReply *cr
2953 )
2954 {
2955         slap_overinst   *on = (slap_overinst *)be->bd_info;
2956         syncprov_info_t *si;
2957
2958         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2959                 Debug( LDAP_DEBUG_ANY,
2960                         "syncprov must be instantiated within a database.\n",
2961                         0, 0, 0 );
2962                 return 1;
2963         }
2964
2965         si = ch_calloc(1, sizeof(syncprov_info_t));
2966         on->on_bi.bi_private = si;
2967         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2968         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2969         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2970
2971         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2972         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2973         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2974         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2975
2976         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2977         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2978
2979         return 0;
2980 }
2981
2982 static int
2983 syncprov_db_destroy(
2984         BackendDB *be,
2985         ConfigReply *cr
2986 )
2987 {
2988         slap_overinst   *on = (slap_overinst *)be->bd_info;
2989         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2990
2991         if ( si ) {
2992                 if ( si->si_logs ) {
2993                         slog_entry *se = si->si_logs->sl_head;
2994
2995                         while ( se ) {
2996                                 slog_entry *se_next = se->se_next;
2997                                 ch_free( se );
2998                                 se = se_next;
2999                         }
3000
3001                         ch_free( si->si_logs );
3002                 }
3003                 if ( si->si_ctxcsn )
3004                         ber_bvarray_free( si->si_ctxcsn );
3005                 if ( si->si_sids )
3006                         ch_free( si->si_sids );
3007                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3008                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3009                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3010                 ch_free( si );
3011         }
3012
3013         return 0;
3014 }
3015
3016 static int syncprov_parseCtrl (
3017         Operation *op,
3018         SlapReply *rs,
3019         LDAPControl *ctrl )
3020 {
3021         ber_tag_t tag;
3022         BerElementBuffer berbuf;
3023         BerElement *ber = (BerElement *)&berbuf;
3024         ber_int_t mode;
3025         ber_len_t len;
3026         struct berval cookie = BER_BVNULL;
3027         sync_control *sr;
3028         int rhint = 0;
3029
3030         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3031                 rs->sr_text = "Sync control specified multiple times";
3032                 return LDAP_PROTOCOL_ERROR;
3033         }
3034
3035         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3036                 rs->sr_text = "Sync control specified with pagedResults control";
3037                 return LDAP_PROTOCOL_ERROR;
3038         }
3039
3040         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3041                 rs->sr_text = "Sync control value is absent";
3042                 return LDAP_PROTOCOL_ERROR;
3043         }
3044
3045         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3046                 rs->sr_text = "Sync control value is empty";
3047                 return LDAP_PROTOCOL_ERROR;
3048         }
3049
3050         /* Parse the control value
3051          *      syncRequestValue ::= SEQUENCE {
3052          *              mode   ENUMERATED {
3053          *                      -- 0 unused
3054          *                      refreshOnly             (1),
3055          *                      -- 2 reserved
3056          *                      refreshAndPersist       (3)
3057          *              },
3058          *              cookie  syncCookie OPTIONAL
3059          *      }
3060          */
3061
3062         ber_init2( ber, &ctrl->ldctl_value, 0 );
3063
3064         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3065                 rs->sr_text = "Sync control : mode decoding error";
3066                 return LDAP_PROTOCOL_ERROR;
3067         }
3068
3069         switch( mode ) {
3070         case LDAP_SYNC_REFRESH_ONLY:
3071                 mode = SLAP_SYNC_REFRESH;
3072                 break;
3073         case LDAP_SYNC_REFRESH_AND_PERSIST:
3074                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3075                 break;
3076         default:
3077                 rs->sr_text = "Sync control : unknown update mode";
3078                 return LDAP_PROTOCOL_ERROR;
3079         }
3080
3081         tag = ber_peek_tag( ber, &len );
3082
3083         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3084                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3085                         rs->sr_text = "Sync control : cookie decoding error";
3086                         return LDAP_PROTOCOL_ERROR;
3087                 }
3088                 tag = ber_peek_tag( ber, &len );
3089         }
3090         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3091                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3092                         rs->sr_text = "Sync control : rhint decoding error";
3093                         return LDAP_PROTOCOL_ERROR;
3094                 }
3095         }
3096         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3097                         rs->sr_text = "Sync control : decoding error";
3098                         return LDAP_PROTOCOL_ERROR;
3099         }
3100         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3101         sr->sr_rhint = rhint;
3102         if (!BER_BVISNULL(&cookie)) {
3103                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3104                 /* If parse fails, pretend no cookie was sent */
3105                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3106                         sr->sr_state.rid == -1 ) {
3107                         if ( sr->sr_state.ctxcsn ) {
3108                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3109                                 sr->sr_state.ctxcsn = NULL;
3110                         }
3111                         sr->sr_state.numcsns = 0;
3112                 }
3113         }
3114
3115         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3116
3117         op->o_sync = ctrl->ldctl_iscritical
3118                 ? SLAP_CONTROL_CRITICAL
3119                 : SLAP_CONTROL_NONCRITICAL;
3120
3121         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3122
3123         return LDAP_SUCCESS;
3124 }
3125
3126 /* This overlay is set up for dynamic loading via moduleload. For static
3127  * configuration, you'll need to arrange for the slap_overinst to be
3128  * initialized and registered by some other function inside slapd.
3129  */
3130
3131 static slap_overinst            syncprov;
3132
3133 int
3134 syncprov_initialize()
3135 {
3136         int rc;
3137
3138         rc = register_supported_control( LDAP_CONTROL_SYNC,
3139                 SLAP_CTRL_SEARCH, NULL,
3140                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3141         if ( rc != LDAP_SUCCESS ) {
3142                 Debug( LDAP_DEBUG_ANY,
3143                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3144                 return rc;
3145         }
3146
3147         syncprov.on_bi.bi_type = "syncprov";
3148         syncprov.on_bi.bi_db_init = syncprov_db_init;
3149         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3150         syncprov.on_bi.bi_db_open = syncprov_db_open;
3151         syncprov.on_bi.bi_db_close = syncprov_db_close;
3152
3153         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3154         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3155
3156         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3157         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3158         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3159         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3160         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3161         syncprov.on_bi.bi_op_search = syncprov_op_search;
3162         syncprov.on_bi.bi_extended = syncprov_op_extended;
3163         syncprov.on_bi.bi_operational = syncprov_operational;
3164
3165         syncprov.on_bi.bi_cf_ocs = spocs;
3166
3167         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3168
3169         rc = config_register_schema( spcfg, spocs );
3170         if ( rc ) return rc;
3171
3172         return overlay_register( &syncprov );
3173 }
3174
3175 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3176 int
3177 init_module( int argc, char *argv[] )
3178 {
3179         return syncprov_initialize();
3180 }
3181 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3182
3183 #endif /* defined(SLAPD_OVER_SYNCPROV) */