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 2004-2005 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
  30 /* A modify request on a particular entry */
  31 typedef struct modinst {
  32         struct modinst *mi_next;
  33         Operation *mi_op;
  34 } modinst;
  35
  36 typedef struct modtarget {
  37         struct modinst *mt_mods;
  38         struct modinst *mt_tail;
  39         Operation *mt_op;
  40         ldap_pvt_thread_mutex_t mt_mutex;
  41 } modtarget;
  42
  43 /* A queued result of a persistent search */
  44 typedef struct syncres {
  45         struct syncres *s_next;
  46         struct berval s_dn;
  47         struct berval s_ndn;
  48         struct berval s_uuid;
  49         struct berval s_csn;
  50         char s_mode;
  51         char s_isreference;
  52 } syncres;
  53
  54 /* Record of a persistent search */
  55 typedef struct syncops {
  56         struct syncops *s_next;
  57         struct berval   s_base;         /* ndn of search base */
  58         ID              s_eid;          /* entryID of search base */
  59         Operation       *s_op;          /* search op */
  60         int             s_rid;
  61         struct berval s_filterstr;
  62         int             s_flags;        /* search status */
  63         int             s_inuse;        /* reference count */
  64         struct syncres *s_res;
  65         struct syncres *s_restail;
  66         ldap_pvt_thread_mutex_t s_mutex;
  67 } syncops;
  68
  69 /* A received sync control */
  70 typedef struct sync_control {
  71         struct sync_cookie sr_state;
  72         int sr_rhint;
  73 } sync_control;
  74
  75 #if 0 /* moved back to slap.h */
  76 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  77 #endif
  78 /* o_sync_mode uses data bits of o_sync */
  79 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  80
  81 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  84 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  85
  86 #define PS_IS_REFRESHING        0x01
  87 #define PS_IS_DETACHED          0x02
  88
  89 /* Record of which searches matched at premodify step */
  90 typedef struct syncmatches {
  91         struct syncmatches *sm_next;
  92         syncops *sm_op;
  93 } syncmatches;
  94
  95 /* Session log data */
  96 typedef struct slog_entry {
  97         struct slog_entry *se_next;
  98         struct berval se_uuid;
  99         struct berval se_csn;
 100         ber_tag_t       se_tag;
 101 } slog_entry;
 102
 103 typedef struct sessionlog {
 104         struct berval   sl_mincsn;
 105         int             sl_num;
 106         int             sl_size;
 107         slog_entry *sl_head;
 108         slog_entry *sl_tail;
 109         ldap_pvt_thread_mutex_t sl_mutex;
 110 } sessionlog;
 111
 112 /* The main state for this overlay */
 113 typedef struct syncprov_info_t {
 114         syncops         *si_ops;
 115         struct berval   si_ctxcsn;      /* ldapsync context */
 116         int             si_chkops;      /* checkpointing info */
 117         int             si_chktime;
 118         int             si_numops;      /* number of ops since last checkpoint */
 119         time_t  si_chklast;     /* time of last checkpoint */
 120         Avlnode *si_mods;       /* entries being modified */
 121         sessionlog      *si_logs;
 122         ldap_pvt_thread_mutex_t si_csn_mutex;
 123         ldap_pvt_thread_mutex_t si_ops_mutex;
 124         ldap_pvt_thread_mutex_t si_mods_mutex;
 125         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 126 } syncprov_info_t;
 127
 128 typedef struct opcookie {
 129         slap_overinst *son;
 130         syncmatches *smatches;
 131         struct berval sdn;      /* DN of entry, for deletes */
 132         struct berval sndn;
 133         struct berval suuid;    /* UUID of entry */
 134         struct berval sctxcsn;
 135         int sreference; /* Is the entry a reference? */
 136 } opcookie;
 137
 138 typedef struct fbase_cookie {
 139         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 140         syncops *fss;   /* persistent search we're testing against */
 141         int fbase;      /* if TRUE we found the search base and it's still valid */
 142         int fscope;     /* if TRUE then fdn is within the psearch scope */
 143 } fbase_cookie;
 144
 145 static AttributeName csn_anlist[3];
 146 static AttributeName uuid_anlist[2];
 147
 148 /* Build a LDAPsync intermediate state control */
 149 static int
 150 syncprov_state_ctrl(
 151         Operation       *op,
 152         SlapReply       *rs,
 153         Entry           *e,
 154         int             entry_sync_state,
 155         LDAPControl     **ctrls,
 156         int             num_ctrls,
 157         int             send_cookie,
 158         struct berval   *cookie )
 159 {
 160         Attribute* a;
 161         int ret;
 162
 163         BerElementBuffer berbuf;
 164         BerElement *ber = (BerElement *)&berbuf;
 165
 166         struct berval   entryuuid_bv = BER_BVNULL;
 167
 168         ber_init2( ber, 0, LBER_USE_DER );
 169         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 170
 171         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 172
 173         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 174                 AttributeDescription *desc = a->a_desc;
 175                 if ( desc == slap_schema.si_ad_entryUUID ) {
 176                         entryuuid_bv = a->a_nvals[0];
 177                         break;
 178                 }
 179         }
 180
 181         /* FIXME: what if entryuuid is NULL or empty ? */
 182
 183         if ( send_cookie && cookie ) {
 184                 ber_printf( ber, "{eOON}",
 185                         entry_sync_state, &entryuuid_bv, cookie );
 186         } else {
 187                 ber_printf( ber, "{eON}",
 188                         entry_sync_state, &entryuuid_bv );
 189         }
 190
 191         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 192         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 193         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 194
 195         ber_free_buf( ber );
 196
 197         if ( ret < 0 ) {
 198                 Debug( LDAP_DEBUG_TRACE,
 199                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 200                         0, 0, 0 );
 201                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 202                 return ret;
 203         }
 204
 205         return LDAP_SUCCESS;
 206 }
 207
 208 /* Build a LDAPsync final state control */
 209 static int
 210 syncprov_done_ctrl(
 211         Operation       *op,
 212         SlapReply       *rs,
 213         LDAPControl     **ctrls,
 214         int                     num_ctrls,
 215         int                     send_cookie,
 216         struct berval *cookie,
 217         int                     refreshDeletes )
 218 {
 219         int ret;
 220         BerElementBuffer berbuf;
 221         BerElement *ber = (BerElement *)&berbuf;
 222
 223         ber_init2( ber, NULL, LBER_USE_DER );
 224         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 225
 226         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 227
 228         ber_printf( ber, "{" );
 229         if ( send_cookie && cookie ) {
 230                 ber_printf( ber, "O", cookie );
 231         }
 232         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 233                 ber_printf( ber, "b", refreshDeletes );
 234         }
 235         ber_printf( ber, "N}" );
 236
 237         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 238         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 239         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 240
 241         ber_free_buf( ber );
 242
 243         if ( ret < 0 ) {
 244                 Debug( LDAP_DEBUG_TRACE,
 245                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 246                         0, 0, 0 );
 247                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 248                 return ret;
 249         }
 250
 251         return LDAP_SUCCESS;
 252 }
 253
 254 static int
 255 syncprov_sendinfo(
 256         Operation       *op,
 257         SlapReply       *rs,
 258         int                     type,
 259         struct berval *cookie,
 260         int                     refreshDone,
 261         BerVarray       syncUUIDs,
 262         int                     refreshDeletes )
 263 {
 264         BerElementBuffer berbuf;
 265         BerElement *ber = (BerElement *)&berbuf;
 266         struct berval rspdata;
 267
 268         int ret;
 269
 270         ber_init2( ber, NULL, LBER_USE_DER );
 271         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 272
 273         if ( type ) {
 274                 switch ( type ) {
 275                 case LDAP_TAG_SYNC_NEW_COOKIE:
 276                         ber_printf( ber, "tO", type, cookie );
 277                         break;
 278                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 279                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 280                         ber_printf( ber, "t{", type );
 281                         if ( cookie ) {
 282                                 ber_printf( ber, "O", cookie );
 283                         }
 284                         if ( refreshDone == 0 ) {
 285                                 ber_printf( ber, "b", refreshDone );
 286                         }
 287                         ber_printf( ber, "N}" );
 288                         break;
 289                 case LDAP_TAG_SYNC_ID_SET:
 290                         ber_printf( ber, "t{", type );
 291                         if ( cookie ) {
 292                                 ber_printf( ber, "O", cookie );
 293                         }
 294                         if ( refreshDeletes == 1 ) {
 295                                 ber_printf( ber, "b", refreshDeletes );
 296                         }
 297                         ber_printf( ber, "[W]", syncUUIDs );
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 default:
 301                         Debug( LDAP_DEBUG_TRACE,
 302                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 303                                 type, 0, 0 );
 304                         return LDAP_OTHER;
 305                 }
 306         }
 307
 308         ret = ber_flatten2( ber, &rspdata, 0 );
 309
 310         if ( ret < 0 ) {
 311                 Debug( LDAP_DEBUG_TRACE,
 312                         "syncprov_sendinfo: ber_flatten2 failed\n",
 313                         0, 0, 0 );
 314                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 315                 return ret;
 316         }
 317
 318         rs->sr_rspoid = LDAP_SYNC_INFO;
 319         rs->sr_rspdata = &rspdata;
 320         send_ldap_intermediate( op, rs );
 321         rs->sr_rspdata = NULL;
 322         ber_free_buf( ber );
 323
 324         return LDAP_SUCCESS;
 325 }
 326
 327 /* Find a modtarget in an AVL tree */
 328 static int
 329 sp_avl_cmp( const void *c1, const void *c2 )
 330 {
 331         const modtarget *m1, *m2;
 332         int rc;
 333
 334         m1 = c1; m2 = c2;
 335         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 336
 337         if ( rc ) return rc;
 338         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 339 }
 340
 341 /* syncprov_findbase:
 342  *   finds the true DN of the base of a search (with alias dereferencing) and
 343  * checks to make sure the base entry doesn't get replaced with a different
 344  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 345  * change is detected, any persistent search on this base must be terminated /
 346  * reloaded.
 347  *   On the first call, we just save the DN and entryID. On subsequent calls
 348  * we compare the DN and entryID with the saved values.
 349  */
 350 static int
 351 findbase_cb( Operation *op, SlapReply *rs )
 352 {
 353         slap_callback *sc = op->o_callback;
 354
 355         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 356                 fbase_cookie *fc = sc->sc_private;
 357
 358                 /* If no entryID, we're looking for the first time.
 359                  * Just store whatever we got.
 360                  */
 361                 if ( fc->fss->s_eid == NOID ) {
 362                         fc->fbase = 1;
 363                         fc->fss->s_eid = rs->sr_entry->e_id;
 364                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 365
 366                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 367                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 368
 369                 /* OK, the DN is the same and the entryID is the same. Now
 370                  * see if the fdn resides in the scope.
 371                  */
 372                         fc->fbase = 1;
 373                         switch ( fc->fss->s_op->ors_scope ) {
 374                         case LDAP_SCOPE_BASE:
 375                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 376                                 break;
 377                         case LDAP_SCOPE_ONELEVEL: {
 378                                 struct berval pdn;
 379                                 dnParent( fc->fdn, &pdn );
 380                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 381                                 break; }
 382                         case LDAP_SCOPE_SUBTREE:
 383                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 384                                 break;
 385 #ifdef LDAP_SCOPE_SUBORDINATE
 386                         case LDAP_SCOPE_SUBORDINATE:
 387                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 388                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 389                                 break;
 390 #endif
 391                         }
 392                 }
 393         }
 394         if ( rs->sr_err != LDAP_SUCCESS ) {
 395                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 396         }
 397         return LDAP_SUCCESS;
 398 }
 399
 400 static int
 401 syncprov_findbase( Operation *op, fbase_cookie *fc )
 402 {
 403         opcookie *opc = op->o_callback->sc_private;
 404         slap_overinst *on = opc->son;
 405
 406         slap_callback cb = {0};
 407         Operation fop;
 408         SlapReply frs = { REP_RESULT };
 409         int rc;
 410
 411         fop = *op;
 412
 413         cb.sc_response = findbase_cb;
 414         cb.sc_private = fc;
 415
 416         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 417         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 418         fop.o_callback = &cb;
 419         fop.o_tag = LDAP_REQ_SEARCH;
 420         fop.ors_scope = LDAP_SCOPE_BASE;
 421         fop.ors_deref = fc->fss->s_op->ors_deref;
 422         fop.ors_limit = NULL;
 423         fop.ors_slimit = 1;
 424         fop.ors_tlimit = SLAP_NO_LIMIT;
 425         fop.ors_attrs = slap_anlist_no_attrs;
 426         fop.ors_attrsonly = 1;
 427         fop.ors_filter = fc->fss->s_op->ors_filter;
 428         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 429
 430         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 431
 432         fop.o_bd->bd_info = on->on_info->oi_orig;
 433         rc = fop.o_bd->be_search( &fop, &frs );
 434         fop.o_bd->bd_info = (BackendInfo *)on;
 435
 436         if ( fc->fbase ) return LDAP_SUCCESS;
 437
 438         /* If entryID has changed, then the base of this search has
 439          * changed. Invalidate the psearch.
 440          */
 441         return LDAP_NO_SUCH_OBJECT;
 442 }
 443
 444 /* syncprov_findcsn:
 445  *   This function has three different purposes, but they all use a search
 446  * that filters on entryCSN so they're combined here.
 447  * 1: at startup time, after a contextCSN has been read from the database,
 448  * we search for all entries with CSN >= contextCSN in case the contextCSN
 449  * was not checkpointed at the previous shutdown.
 450  *
 451  * 2: when the current contextCSN is known and we have a sync cookie, we search
 452  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 453  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 454  *
 455  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 456  * CSN, and generate Present records for them. We always collect this result
 457  * in SyncID sets, even if there's only one match.
 458  */
 459 #define FIND_MAXCSN     1
 460 #define FIND_CSN        2
 461 #define FIND_PRESENT    3
 462
 463 static int
 464 findmax_cb( Operation *op, SlapReply *rs )
 465 {
 466         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 467                 struct berval *maxcsn = op->o_callback->sc_private;
 468                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 469                         slap_schema.si_ad_entryCSN );
 470
 471                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 472                         maxcsn->bv_len = a->a_vals[0].bv_len;
 473                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 474                 }
 475         }
 476         return LDAP_SUCCESS;
 477 }
 478
 479 static int
 480 findcsn_cb( Operation *op, SlapReply *rs )
 481 {
 482         slap_callback *sc = op->o_callback;
 483
 484         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 485                 sc->sc_private = (void *)1;
 486         }
 487         return LDAP_SUCCESS;
 488 }
 489
 490 /* Build a list of entryUUIDs for sending in a SyncID set */
 491
 492 #define UUID_LEN        16
 493
 494 typedef struct fpres_cookie {
 495         int num;
 496         BerVarray uuids;
 497         char *last;
 498 } fpres_cookie;
 499
 500 static int
 501 findpres_cb( Operation *op, SlapReply *rs )
 502 {
 503         slap_callback *sc = op->o_callback;
 504         fpres_cookie *pc = sc->sc_private;
 505         Attribute *a;
 506         int ret = SLAP_CB_CONTINUE;
 507
 508         switch ( rs->sr_type ) {
 509         case REP_SEARCH:
 510                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 511                 if ( a ) {
 512                         pc->uuids[pc->num].bv_val = pc->last;
 513                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 514                                 pc->uuids[pc->num].bv_len );
 515                         pc->num++;
 516                         pc->last = pc->uuids[pc->num].bv_val;
 517                         pc->uuids[pc->num].bv_val = NULL;
 518                 }
 519                 ret = LDAP_SUCCESS;
 520                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 521                         break;
 522                 /* FALLTHRU */
 523         case REP_RESULT:
 524                 ret = rs->sr_err;
 525                 if ( pc->num ) {
 526                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 527                                 0, pc->uuids, 0 );
 528                         pc->uuids[pc->num].bv_val = pc->last;
 529                         pc->num = 0;
 530                         pc->last = pc->uuids[0].bv_val;
 531                 }
 532                 break;
 533         default:
 534                 break;
 535         }
 536         return ret;
 537 }
 538
 539 static int
 540 syncprov_findcsn( Operation *op, int mode )
 541 {
 542         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 543         syncprov_info_t         *si = on->on_bi.bi_private;
 544
 545         slap_callback cb = {0};
 546         Operation fop;
 547         SlapReply frs = { REP_RESULT };
 548         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 549         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 550         struct berval maxcsn;
 551         Filter cf, af;
 552 #ifdef LDAP_COMP_MATCH
 553         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 554 #else
 555         AttributeAssertion eq = { NULL, BER_BVNULL };
 556 #endif
 557         int i, rc = LDAP_SUCCESS;
 558         fpres_cookie pcookie;
 559         sync_control *srs = NULL;
 560         int findcsn_retry = 1;
 561
 562         if ( mode != FIND_MAXCSN ) {
 563                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 564
 565                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 566                         return LDAP_OTHER;
 567                 }
 568         }
 569
 570         fop = *op;
 571         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 572         /* We want pure entries, not referrals */
 573         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 574
 575         cf.f_ava = &eq;
 576         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 577         cf.f_next = NULL;
 578
 579         fop.o_callback = &cb;
 580         fop.ors_limit = NULL;
 581         fop.ors_tlimit = SLAP_NO_LIMIT;
 582         fop.ors_filter = &cf;
 583         fop.ors_filterstr.bv_val = buf;
 584
 585 again:
 586         switch( mode ) {
 587         case FIND_MAXCSN:
 588                 cf.f_choice = LDAP_FILTER_GE;
 589                 cf.f_av_value = si->si_ctxcsn;
 590                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 591                         cf.f_av_value.bv_val );
 592                 fop.ors_attrsonly = 0;
 593                 fop.ors_attrs = csn_anlist;
 594                 fop.ors_slimit = SLAP_NO_LIMIT;
 595                 cb.sc_private = &maxcsn;
 596                 cb.sc_response = findmax_cb;
 597                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 598                 maxcsn.bv_val = cbuf;
 599                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 600                 break;
 601         case FIND_CSN:
 602                 cf.f_av_value = srs->sr_state.ctxcsn;
 603                 /* Look for exact match the first time */
 604                 if ( findcsn_retry ) {
 605                         cf.f_choice = LDAP_FILTER_EQUALITY;
 606                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 607                                 cf.f_av_value.bv_val );
 608                 /* On retry, look for <= */
 609                 } else {
 610                         cf.f_choice = LDAP_FILTER_LE;
 611                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 612                                 cf.f_av_value.bv_val );
 613                 }
 614                 fop.ors_attrsonly = 1;
 615                 fop.ors_attrs = slap_anlist_no_attrs;
 616                 fop.ors_slimit = 1;
 617                 cb.sc_private = NULL;
 618                 cb.sc_response = findcsn_cb;
 619                 break;
 620         case FIND_PRESENT:
 621                 af.f_choice = LDAP_FILTER_AND;
 622                 af.f_next = NULL;
 623                 af.f_and = &cf;
 624                 cf.f_choice = LDAP_FILTER_LE;
 625                 cf.f_av_value = srs->sr_state.ctxcsn;
 626                 cf.f_next = op->ors_filter;
 627                 fop.ors_filter = &af;
 628                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 629                 fop.ors_attrsonly = 0;
 630                 fop.ors_attrs = uuid_anlist;
 631                 fop.ors_slimit = SLAP_NO_LIMIT;
 632                 cb.sc_private = &pcookie;
 633                 cb.sc_response = findpres_cb;
 634                 pcookie.num = 0;
 635
 636                 /* preallocate storage for a full set */
 637                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 638                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 639                         op->o_tmpmemctx );
 640                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 641                 pcookie.uuids[0].bv_val = pcookie.last;
 642                 pcookie.uuids[0].bv_len = UUID_LEN;
 643                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 644                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 645                         pcookie.uuids[i].bv_len = UUID_LEN;
 646                 }
 647                 break;
 648         }
 649
 650         fop.o_bd->bd_info = on->on_info->oi_orig;
 651         fop.o_bd->be_search( &fop, &frs );
 652         fop.o_bd->bd_info = (BackendInfo *)on;
 653
 654         switch( mode ) {
 655         case FIND_MAXCSN:
 656                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 657                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 658                 break;
 659         case FIND_CSN:
 660                 /* If matching CSN was not found, invalidate the context. */
 661                 if ( !cb.sc_private ) {
 662                         /* If we didn't find an exact match, then try for <= */
 663                         if ( findcsn_retry ) {
 664                                 findcsn_retry = 0;
 665                                 goto again;
 666                         }
 667                         rc = LDAP_NO_SUCH_OBJECT;
 668                 }
 669                 break;
 670         case FIND_PRESENT:
 671                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 672                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 673                 break;
 674         }
 675
 676         return rc;
 677 }
 678
 679 /* Queue a persistent search response */
 680 static int
 681 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 682 {
 683         syncres *sr;
 684
 685         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 686                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 687         sr->s_next = NULL;
 688         sr->s_dn.bv_val = (char *)(sr + 1);
 689         sr->s_dn.bv_len = opc->sdn.bv_len;
 690         sr->s_mode = mode;
 691         sr->s_isreference = opc->sreference;
 692         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 693         sr->s_ndn.bv_len = opc->sndn.bv_len;
 694         *(sr->s_ndn.bv_val++) = '\0';
 695         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 696         sr->s_uuid.bv_len = opc->suuid.bv_len;
 697         *(sr->s_uuid.bv_val++) = '\0';
 698         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 699         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 700         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 701
 702         if ( !so->s_res ) {
 703                 so->s_res = sr;
 704         } else {
 705                 so->s_restail->s_next = sr;
 706         }
 707         so->s_restail = sr;
 708         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 709         return LDAP_SUCCESS;
 710 }
 711
 712 /* Play back queued responses */
 713 static int
 714 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue );
 715
 716 static int
 717 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 718 {
 719         syncres *sr, *srnext;
 720         Entry *e;
 721         opcookie opc;
 722         int rc;
 723
 724         opc.son = on;
 725         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 726         for (sr = so->s_res; sr; sr=srnext) {
 727                 srnext = sr->s_next;
 728                 opc.sdn = sr->s_dn;
 729                 opc.sndn = sr->s_ndn;
 730                 opc.suuid = sr->s_uuid;
 731                 opc.sctxcsn = sr->s_csn;
 732                 opc.sreference = sr->s_isreference;
 733                 e = NULL;
 734
 735                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 736                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 737                         if ( rc ) {
 738                                 ch_free( sr );
 739                                 so->s_res = srnext;
 740                                 continue;
 741                         }
 742                 }
 743                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode, 0 );
 744
 745                 if ( e ) {
 746                         be_entry_release_rw( op, e, 0 );
 747                 }
 748                 if ( rc )
 749                         break;
 750
 751                 ch_free( sr );
 752                 so->s_res = srnext;
 753         }
 754         op->o_bd->bd_info = (BackendInfo *)on;
 755         if ( !so->s_res )
 756                 so->s_restail = NULL;
 757         return rc;
 758 }
 759
 760 /* Send a persistent search response */
 761 static int
 762 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue )
 763 {
 764         slap_overinst *on = opc->son;
 765
 766         SlapReply rs = { REP_SEARCH };
 767         LDAPControl *ctrls[2];
 768         struct berval cookie;
 769         Entry e_uuid = {0};
 770         Attribute a_uuid = {0};
 771         Operation sop = *so->s_op;
 772         Opheader ohdr;
 773
 774         if ( so->s_op->o_abandon )
 775                 return SLAPD_ABANDON;
 776
 777         ohdr = *sop.o_hdr;
 778         sop.o_hdr = &ohdr;
 779         sop.o_tmpmemctx = op->o_tmpmemctx;
 780         sop.o_bd = op->o_bd;
 781         sop.o_controls = op->o_controls;
 782         sop.o_private = op->o_private;
 783
 784         /* If queueing is allowed */
 785         if ( queue ) {
 786                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 787                 /* If we're still in refresh mode, must queue */
 788                 if (so->s_flags & PS_IS_REFRESHING) {
 789                         return syncprov_qresp( opc, so, mode );
 790                 }
 791                 /* If connection is free but queue is non-empty,
 792                  * try to flush the queue.
 793                  */
 794                 if ( so->s_res ) {
 795                         rs.sr_err = syncprov_qplay( &sop, on, so );
 796                 }
 797                 /* If the connection is busy, must queue */
 798                 if ( sop.o_conn->c_writewaiter || rs.sr_err == LDAP_BUSY ) {
 799                         return syncprov_qresp( opc, so, mode );
 800                 }
 801                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 802
 803                 /* If syncprov_qplay returned any other error, bail out. */
 804                 if ( rs.sr_err ) {
 805                         return rs.sr_err;
 806                 }
 807         } else {
 808                 /* Queueing not allowed and conn is busy, give up */
 809                 if ( sop.o_conn->c_writewaiter )
 810                         return LDAP_BUSY;
 811         }
 812
 813         ctrls[1] = NULL;
 814         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 815
 816         e_uuid.e_attrs = &a_uuid;
 817         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 818         a_uuid.a_nvals = &opc->suuid;
 819         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 820                 mode, ctrls, 0, 1, &cookie );
 821
 822         rs.sr_ctrls = ctrls;
 823         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 824         switch( mode ) {
 825         case LDAP_SYNC_ADD:
 826                 rs.sr_entry = *e;
 827                 if ( rs.sr_entry->e_private )
 828                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 829                 if ( opc->sreference ) {
 830                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 831                         send_search_reference( &sop, &rs );
 832                         ber_bvarray_free( rs.sr_ref );
 833                         if ( !rs.sr_entry )
 834                                 *e = NULL;
 835                         break;
 836                 }
 837                 /* fallthru */
 838         case LDAP_SYNC_MODIFY:
 839                 rs.sr_entry = *e;
 840                 if ( rs.sr_entry->e_private )
 841                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 842                 rs.sr_attrs = sop.ors_attrs;
 843                 send_search_entry( &sop, &rs );
 844                 if ( !rs.sr_entry )
 845                         *e = NULL;
 846                 break;
 847         case LDAP_SYNC_DELETE:
 848                 e_uuid.e_attrs = NULL;
 849                 e_uuid.e_name = opc->sdn;
 850                 e_uuid.e_nname = opc->sndn;
 851                 rs.sr_entry = &e_uuid;
 852                 if ( opc->sreference ) {
 853                         struct berval bv = BER_BVNULL;
 854                         rs.sr_ref = &bv;
 855                         send_search_reference( &sop, &rs );
 856                 } else {
 857                         send_search_entry( &sop, &rs );
 858                 }
 859                 break;
 860         default:
 861                 assert(0);
 862         }
 863         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 864         op->o_private = sop.o_private;
 865         rs.sr_ctrls = NULL;
 866         /* Check queue again here; if we were hanging in a send and eventually
 867          * recovered, there may be more to send now. But don't check if the
 868          * original psearch has been abandoned.
 869          */
 870         if ( so->s_op->o_abandon )
 871                 return SLAPD_ABANDON;
 872
 873         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 874                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 875                 rs.sr_err = syncprov_qplay( &sop, on, so );
 876                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 877         }
 878         return rs.sr_err;
 879 }
 880
 881 static void
 882 syncprov_free_syncop( syncops *so )
 883 {
 884         syncres *sr, *srnext;
 885         GroupAssertion *ga, *gnext;
 886
 887         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 888         so->s_inuse--;
 889         if ( so->s_inuse > 0 ) {
 890                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 891                 return;
 892         }
 893         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 894         if ( so->s_flags & PS_IS_DETACHED ) {
 895                 filter_free( so->s_op->ors_filter );
 896                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 897                         gnext = ga->ga_next;
 898                         ch_free( ga );
 899                 }
 900                 ch_free( so->s_op );
 901         }
 902         ch_free( so->s_base.bv_val );
 903         for ( sr=so->s_res; sr; sr=srnext ) {
 904                 srnext = sr->s_next;
 905                 ch_free( sr );
 906         }
 907         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 908         ch_free( so );
 909 }
 910
 911 static int
 912 syncprov_drop_psearch( syncops *so, int lock )
 913 {
 914         if ( so->s_flags & PS_IS_DETACHED ) {
 915                 if ( lock )
 916                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 917                 so->s_op->o_conn->c_n_ops_executing--;
 918                 so->s_op->o_conn->c_n_ops_completed++;
 919                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 920                         o_next );
 921                 if ( lock )
 922                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 923         }
 924         syncprov_free_syncop( so );
 925
 926         return 0;
 927 }
 928
 929 static int
 930 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 931 {
 932         slap_callback *sc = op->o_callback;
 933         op->o_callback = sc->sc_next;
 934         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 935         op->o_tmpfree( sc, op->o_tmpmemctx );
 936         return 0;
 937 }
 938
 939 static int
 940 syncprov_op_abandon( Operation *op, SlapReply *rs )
 941 {
 942         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 943         syncprov_info_t         *si = on->on_bi.bi_private;
 944         syncops *so, *soprev;
 945
 946         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 947         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 948                 soprev=so, so=so->s_next ) {
 949                 if ( so->s_op->o_connid == op->o_connid &&
 950                         so->s_op->o_msgid == op->orn_msgid ) {
 951                                 so->s_op->o_abandon = 1;
 952                                 soprev->s_next = so->s_next;
 953                                 break;
 954                 }
 955         }
 956         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 957         if ( so ) {
 958                 /* Is this really a Cancel exop? */
 959                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 960                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 961                         rs->sr_err = LDAP_CANCELLED;
 962                         send_ldap_result( so->s_op, rs );
 963                         if ( so->s_flags & PS_IS_DETACHED ) {
 964                                 slap_callback *cb;
 965                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 966                                 cb->sc_cleanup = syncprov_ab_cleanup;
 967                                 cb->sc_next = op->o_callback;
 968                                 cb->sc_private = so;
 969                                 return SLAP_CB_CONTINUE;
 970                         }
 971                 }
 972                 syncprov_drop_psearch( so, 0 );
 973         }
 974         return SLAP_CB_CONTINUE;
 975 }
 976
 977 /* Find which persistent searches are affected by this operation */
 978 static void
 979 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 980 {
 981         slap_overinst *on = opc->son;
 982         syncprov_info_t         *si = on->on_bi.bi_private;
 983
 984         fbase_cookie fc;
 985         syncops *ss, *sprev, *snext;
 986         Entry *e;
 987         Attribute *a;
 988         int rc;
 989         struct berval newdn;
 990         int freefdn = 0;
 991
 992         fc.fdn = &op->o_req_ndn;
 993         /* compute new DN */
 994         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 995                 struct berval pdn;
 996                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 997                 else dnParent( fc.fdn, &pdn );
 998                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 999                 fc.fdn = &newdn;
1000                 freefdn = 1;
1001         }
1002         if ( op->o_tag != LDAP_REQ_ADD ) {
1003                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1004                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1005                 /* If we're sending responses now, make a copy and unlock the DB */
1006                 if ( e && !saveit ) {
1007                         Entry *e2 = entry_dup( e );
1008                         be_entry_release_rw( op, e, 0 );
1009                         e = e2;
1010                 }
1011                 op->o_bd->bd_info = (BackendInfo *)on;
1012                 if ( rc ) return;
1013         } else {
1014                 e = op->ora_e;
1015         }
1016
1017         if ( saveit ) {
1018                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1019                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1020                 opc->sreference = is_entry_referral( e );
1021         }
1022         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1023                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1024                 if ( a )
1025                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1026         }
1027
1028         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1029         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1030                 sprev = ss, ss=snext)
1031         {
1032                 syncmatches *sm;
1033                 int found = 0;
1034
1035                 snext = ss->s_next;
1036                 /* validate base */
1037                 fc.fss = ss;
1038                 fc.fbase = 0;
1039                 fc.fscope = 0;
1040
1041                 /* If the base of the search is missing, signal a refresh */
1042                 rc = syncprov_findbase( op, &fc );
1043                 if ( rc != LDAP_SUCCESS ) {
1044                         SlapReply rs = {REP_RESULT};
1045                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1046                                 "search base has changed" );
1047                         sprev->s_next = snext;
1048                         syncprov_drop_psearch( ss, 1 );
1049                         continue;
1050                 }
1051
1052                 /* If we're sending results now, look for this op in old matches */
1053                 if ( !saveit ) {
1054                         syncmatches *old;
1055                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1056                                 old=sm, sm=sm->sm_next ) {
1057                                 if ( sm->sm_op == ss ) {
1058                                         found = 1;
1059                                         old->sm_next = sm->sm_next;
1060                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1061                                         break;
1062                                 }
1063                         }
1064                 }
1065
1066                 /* check if current o_req_dn is in scope and matches filter */
1067                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1068                         LDAP_COMPARE_TRUE ) {
1069                         if ( saveit ) {
1070                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1071                                 sm->sm_next = opc->smatches;
1072                                 sm->sm_op = ss;
1073                                 ss->s_inuse++;
1074                                 opc->smatches = sm;
1075                         } else {
1076                                 /* if found send UPDATE else send ADD */
1077                                 ss->s_inuse++;
1078                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1079                                 syncprov_sendresp( op, opc, ss, &e,
1080                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1081                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1082                                 ss->s_inuse--;
1083                         }
1084                 } else if ( !saveit && found ) {
1085                         /* send DELETE */
1086                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1087                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1088                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1089                 }
1090         }
1091         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1092
1093         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1094                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1095                 be_entry_release_rw( op, e, 0 );
1096                 op->o_bd->bd_info = (BackendInfo *)on;
1097         }
1098         if ( freefdn ) {
1099                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1100         }
1101 }
1102
1103 static int
1104 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1105 {
1106         slap_callback *cb = op->o_callback;
1107         opcookie *opc = cb->sc_private;
1108         slap_overinst *on = opc->son;
1109         syncprov_info_t         *si = on->on_bi.bi_private;
1110         syncmatches *sm, *snext;
1111         modtarget *mt, mtdummy;
1112
1113         for (sm = opc->smatches; sm; sm=snext) {
1114                 snext = sm->sm_next;
1115                 syncprov_free_syncop( sm->sm_op );
1116                 op->o_tmpfree( sm, op->o_tmpmemctx );
1117         }
1118
1119         /* Remove op from lock table */
1120         mtdummy.mt_op = op;
1121         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1122         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1123         if ( mt ) {
1124                 modinst *mi = mt->mt_mods;
1125
1126                 /* If there are more, promote the next one */
1127                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1128                 if ( mi->mi_next ) {
1129                         mt->mt_mods = mi->mi_next;
1130                         mt->mt_op = mt->mt_mods->mi_op;
1131                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1132                 } else {
1133                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1134                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1135                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1136                         ch_free( mt );
1137                 }
1138         }
1139         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1140         if ( !BER_BVISNULL( &opc->suuid ))
1141                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1142         if ( !BER_BVISNULL( &opc->sndn ))
1143                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1144         if ( !BER_BVISNULL( &opc->sdn ))
1145                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1146         op->o_callback = cb->sc_next;
1147         op->o_tmpfree(cb, op->o_tmpmemctx);
1148
1149         return 0;
1150 }
1151
1152 static void
1153 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1154 {
1155         syncprov_info_t         *si = on->on_bi.bi_private;
1156         Modifications mod;
1157         Operation opm;
1158         struct berval bv[2];
1159         slap_callback cb = {0};
1160         int manage = get_manageDSAit(op);
1161
1162         mod.sml_values = bv;
1163         bv[1].bv_val = NULL;
1164         bv[0] = si->si_ctxcsn;
1165         mod.sml_nvalues = NULL;
1166         mod.sml_desc = slap_schema.si_ad_contextCSN;
1167         mod.sml_op = LDAP_MOD_REPLACE;
1168         mod.sml_flags = 0;
1169         mod.sml_next = NULL;
1170
1171         cb.sc_response = slap_null_cb;
1172         opm = *op;
1173         opm.o_tag = LDAP_REQ_MODIFY;
1174         opm.o_callback = &cb;
1175         opm.orm_modlist = &mod;
1176         opm.o_req_dn = op->o_bd->be_suffix[0];
1177         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1178         opm.o_bd->bd_info = on->on_info->oi_orig;
1179         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1180         opm.o_bd->be_modify( &opm, rs );
1181         opm.o_managedsait = manage;
1182 }
1183
1184 static void
1185 syncprov_add_slog( Operation *op, struct berval *csn )
1186 {
1187         opcookie *opc = op->o_callback->sc_private;
1188         slap_overinst *on = opc->son;
1189         syncprov_info_t         *si = on->on_bi.bi_private;
1190         sessionlog *sl;
1191         slog_entry *se;
1192
1193         sl = si->si_logs;
1194         {
1195                 /* Allocate a record. UUIDs are not NUL-terminated. */
1196                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1197                         csn->bv_len + 1 );
1198                 se->se_next = NULL;
1199                 se->se_tag = op->o_tag;
1200
1201                 se->se_uuid.bv_val = (char *)(se+1);
1202                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1203                 se->se_uuid.bv_len = opc->suuid.bv_len;
1204
1205                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1206                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1207                 se->se_csn.bv_val[csn->bv_len] = '\0';
1208                 se->se_csn.bv_len = csn->bv_len;
1209
1210                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1211                 if ( sl->sl_head ) {
1212                         sl->sl_tail->se_next = se;
1213                 } else {
1214                         sl->sl_head = se;
1215                 }
1216                 sl->sl_tail = se;
1217                 sl->sl_num++;
1218                 while ( sl->sl_num > sl->sl_size ) {
1219                         se = sl->sl_head;
1220                         sl->sl_head = se->se_next;
1221                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1222                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1223                         ch_free( se );
1224                         sl->sl_num--;
1225                         if ( !sl->sl_head ) {
1226                                 sl->sl_tail = NULL;
1227                         }
1228                 }
1229                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1230         }
1231 }
1232
1233 /* Just set a flag if we found the matching entry */
1234 static int
1235 playlog_cb( Operation *op, SlapReply *rs )
1236 {
1237         if ( rs->sr_type == REP_SEARCH ) {
1238                 op->o_callback->sc_private = (void *)1;
1239         }
1240         return rs->sr_err;
1241 }
1242
1243 /* enter with sl->sl_mutex locked, release before returning */
1244 static void
1245 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1246         struct berval *oldcsn, struct berval *ctxcsn )
1247 {
1248         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1249         slog_entry *se;
1250         int i, j, ndel, num, nmods, mmods;
1251         BerVarray uuids;
1252
1253         if ( !sl->sl_num ) {
1254                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1255                 return;
1256         }
1257
1258         num = sl->sl_num;
1259         i = 0;
1260         nmods = 0;
1261
1262         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1263                 num * UUID_LEN, op->o_tmpmemctx );
1264
1265         uuids[0].bv_val = (char *)(uuids + num + 1);
1266
1267         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1268          * and everything else at the end. Do this first so we can
1269          * unlock the list mutex.
1270          */
1271         for ( se=sl->sl_head; se; se=se->se_next ) {
1272                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1273                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1274                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1275                         j = i;
1276                         i++;
1277                 } else {
1278                         nmods++;
1279                         j = num - nmods;
1280                 }
1281                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1282                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1283                 uuids[j].bv_len = UUID_LEN;
1284         }
1285         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1286
1287         ndel = i;
1288
1289         /* Zero out unused slots */
1290         for ( i=ndel; i < num - nmods; i++ )
1291                 uuids[i].bv_len = 0;
1292
1293         /* Mods must be validated to see if they belong in this delete set.
1294          */
1295
1296         mmods = nmods;
1297         /* Strip any duplicates */
1298         for ( i=0; i<nmods; i++ ) {
1299                 for ( j=0; j<ndel; j++ ) {
1300                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1301                                 uuids[num - 1 - i].bv_len = 0;
1302                                 mmods --;
1303                                 break;
1304                         }
1305                 }
1306                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1307                 for ( j=0; j<i; j++ ) {
1308                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1309                                 uuids[num - 1 - i].bv_len = 0;
1310                                 mmods --;
1311                                 break;
1312                         }
1313                 }
1314         }
1315
1316         if ( mmods ) {
1317                 Operation fop;
1318                 SlapReply frs = { REP_RESULT };
1319                 int rc;
1320                 Filter mf, af;
1321 #ifdef LDAP_COMP_MATCH
1322                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1323 #else
1324                 AttributeAssertion eq;
1325 #endif
1326                 slap_callback cb = {0};
1327
1328                 fop = *op;
1329
1330                 fop.o_sync_mode = 0;
1331                 fop.o_callback = &cb;
1332                 fop.ors_limit = NULL;
1333                 fop.ors_tlimit = SLAP_NO_LIMIT;
1334                 fop.ors_attrs = slap_anlist_all_attributes;
1335                 fop.ors_attrsonly = 0;
1336                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1337
1338                 af.f_choice = LDAP_FILTER_AND;
1339                 af.f_next = NULL;
1340                 af.f_and = &mf;
1341                 mf.f_choice = LDAP_FILTER_EQUALITY;
1342                 mf.f_ava = &eq;
1343                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1344                 mf.f_next = fop.ors_filter;
1345
1346                 fop.ors_filter = &af;
1347
1348                 cb.sc_response = playlog_cb;
1349                 fop.o_bd->bd_info = on->on_info->oi_orig;
1350
1351                 for ( i=ndel; i<num; i++ ) {
1352                         if ( uuids[i].bv_len == 0 ) continue;
1353
1354                         mf.f_av_value = uuids[i];
1355                         cb.sc_private = NULL;
1356                         fop.ors_slimit = 1;
1357                         rc = fop.o_bd->be_search( &fop, &frs );
1358
1359                         /* If entry was not found, add to delete list */
1360                         if ( !cb.sc_private ) {
1361                                 uuids[ndel++] = uuids[i];
1362                         }
1363                 }
1364                 fop.o_bd->bd_info = (BackendInfo *)on;
1365         }
1366         if ( ndel ) {
1367                 uuids[ndel].bv_val = NULL;
1368                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1369         }
1370 }
1371
1372 static int
1373 syncprov_op_response( Operation *op, SlapReply *rs )
1374 {
1375         opcookie *opc = op->o_callback->sc_private;
1376         slap_overinst *on = opc->son;
1377         syncprov_info_t         *si = on->on_bi.bi_private;
1378         syncmatches *sm;
1379
1380         if ( rs->sr_err == LDAP_SUCCESS )
1381         {
1382                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1383                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1384
1385                 /* Update our context CSN */
1386                 cbuf[0] = '\0';
1387                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1388                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1389                 if ( !BER_BVISNULL( &maxcsn ) ) {
1390                         strcpy( cbuf, maxcsn.bv_val );
1391                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1392                                 strcpy( si->si_ctxcsnbuf, cbuf );
1393                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1394                         }
1395                 }
1396
1397                 /* Don't do any processing for consumer contextCSN updates */
1398                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1399                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1400                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1401                         return SLAP_CB_CONTINUE;
1402                 }
1403
1404                 si->si_numops++;
1405                 if ( si->si_chkops || si->si_chktime ) {
1406                         int do_check=0;
1407                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1408                                 do_check = 1;
1409                                 si->si_numops = 0;
1410                         }
1411                         if ( si->si_chktime &&
1412                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1413                                 do_check = 1;
1414                                 si->si_chklast = op->o_time;
1415                         }
1416                         if ( do_check ) {
1417                                 syncprov_checkpoint( op, rs, on );
1418                         }
1419                 }
1420                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1421
1422                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1423                 opc->sctxcsn.bv_val = cbuf;
1424
1425                 /* Handle any persistent searches */
1426                 if ( si->si_ops ) {
1427                         switch(op->o_tag) {
1428                         case LDAP_REQ_ADD:
1429                         case LDAP_REQ_MODIFY:
1430                         case LDAP_REQ_MODRDN:
1431                         case LDAP_REQ_EXTENDED:
1432                                 syncprov_matchops( op, opc, 0 );
1433                                 break;
1434                         case LDAP_REQ_DELETE:
1435                                 /* for each match in opc->smatches:
1436                                  *   send DELETE msg
1437                                  */
1438                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1439                                         if ( sm->sm_op->s_op->o_abandon )
1440                                                 continue;
1441                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1442                                                 LDAP_SYNC_DELETE, 1 );
1443                                 }
1444                                 break;
1445                         }
1446                 }
1447
1448                 /* Add any log records */
1449                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1450                         syncprov_add_slog( op, &curcsn );
1451                 }
1452
1453         }
1454         return SLAP_CB_CONTINUE;
1455 }
1456
1457 /* We don't use a subentry to store the context CSN any more.
1458  * We expose the current context CSN as an operational attribute
1459  * of the suffix entry.
1460  */
1461 static int
1462 syncprov_op_compare( Operation *op, SlapReply *rs )
1463 {
1464         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1465         syncprov_info_t         *si = on->on_bi.bi_private;
1466         int rc = SLAP_CB_CONTINUE;
1467
1468         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1469                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1470         {
1471                 Entry e = {0};
1472                 Attribute a = {0};
1473                 struct berval bv[2];
1474
1475                 e.e_name = op->o_bd->be_suffix[0];
1476                 e.e_nname = op->o_bd->be_nsuffix[0];
1477
1478                 BER_BVZERO( &bv[1] );
1479                 bv[0] = si->si_ctxcsn;
1480
1481                 a.a_desc = slap_schema.si_ad_contextCSN;
1482                 a.a_vals = bv;
1483                 a.a_nvals = a.a_vals;
1484
1485                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1486
1487                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1488                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1489                 if ( ! rs->sr_err ) {
1490                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1491                         goto return_results;
1492                 }
1493
1494                 if ( get_assert( op ) &&
1495                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1496                 {
1497                         rs->sr_err = LDAP_ASSERTION_FAILED;
1498                         goto return_results;
1499                 }
1500
1501
1502                 rs->sr_err = LDAP_COMPARE_FALSE;
1503
1504                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1505                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1506                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1507                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1508                 {
1509                         rs->sr_err = LDAP_COMPARE_TRUE;
1510                 }
1511
1512 return_results:;
1513
1514                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1515
1516                 send_ldap_result( op, rs );
1517
1518                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1519                         rs->sr_err = LDAP_SUCCESS;
1520                 }
1521                 rc = rs->sr_err;
1522         }
1523
1524         return rc;
1525 }
1526
1527 static int
1528 syncprov_op_mod( Operation *op, SlapReply *rs )
1529 {
1530         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1531         syncprov_info_t         *si = on->on_bi.bi_private;
1532
1533         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1534                 sizeof(opcookie) +
1535                 (si->si_ops ? sizeof(modinst) : 0 ),
1536                 op->o_tmpmemctx);
1537         opcookie *opc = (opcookie *)(cb+1);
1538         opc->son = on;
1539         cb->sc_response = syncprov_op_response;
1540         cb->sc_cleanup = syncprov_op_cleanup;
1541         cb->sc_private = opc;
1542         cb->sc_next = op->o_callback;
1543         op->o_callback = cb;
1544
1545         /* If there are active persistent searches, lock this operation.
1546          * See seqmod.c for the locking logic on its own.
1547          */
1548         if ( si->si_ops ) {
1549                 modtarget *mt, mtdummy;
1550                 modinst *mi;
1551
1552                 mi = (modinst *)(opc+1);
1553                 mi->mi_op = op;
1554
1555                 /* See if we're already modifying this entry... */
1556                 mtdummy.mt_op = op;
1557                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1558                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1559                 if ( mt ) {
1560                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1561                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1562                         mt->mt_tail->mi_next = mi;
1563                         mt->mt_tail = mi;
1564                         /* wait for this op to get to head of list */
1565                         while ( mt->mt_mods != mi ) {
1566                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1567                                 ldap_pvt_thread_yield();
1568                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1569
1570                                 /* clean up if the caller is giving up */
1571                                 if ( op->o_abandon ) {
1572                                         modinst *m2;
1573                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1574                                                 m2 = m2->mi_next );
1575                                         m2->mi_next = mi->mi_next;
1576                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1577                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1578                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1579                                         return SLAPD_ABANDON;
1580                                 }
1581                         }
1582                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1583                 } else {
1584                         /* Record that we're modifying this entry now */
1585                         mt = ch_malloc( sizeof(modtarget) );
1586                         mt->mt_mods = mi;
1587                         mt->mt_tail = mi;
1588                         mt->mt_op = mi->mi_op;
1589                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1590                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1591                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1592                 }
1593         }
1594
1595         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1596                 syncprov_matchops( op, opc, 1 );
1597
1598         return SLAP_CB_CONTINUE;
1599 }
1600
1601 static int
1602 syncprov_op_extended( Operation *op, SlapReply *rs )
1603 {
1604         if ( exop_is_write( op ))
1605                 return syncprov_op_mod( op, rs );
1606
1607         return SLAP_CB_CONTINUE;
1608 }
1609
1610 typedef struct searchstate {
1611         slap_overinst *ss_on;
1612         syncops *ss_so;
1613         int ss_present;
1614         struct berval ss_ctxcsn;
1615         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1616 } searchstate;
1617
1618 static int
1619 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1620 {
1621         if ( rs->sr_ctrls ) {
1622                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1623                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1624                 rs->sr_ctrls = NULL;
1625         }
1626         return 0;
1627 }
1628
1629 static void
1630 syncprov_detach_op( Operation *op, syncops *so )
1631 {
1632         Operation *op2;
1633         int i, alen = 0;
1634         size_t size;
1635         char *ptr;
1636         GroupAssertion *g1, *g2;
1637
1638         /* count the search attrs */
1639         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1640                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1641         }
1642         /* Make a new copy of the operation */
1643         size = sizeof(Operation) + sizeof(Opheader) +
1644                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1645                 op->o_req_dn.bv_len + 1 +
1646                 op->o_req_ndn.bv_len + 1 +
1647                 op->o_ndn.bv_len + 1 +
1648                 so->s_filterstr.bv_len + 1;
1649         op2 = (Operation *)ch_calloc( 1, size );
1650         op2->o_hdr = (Opheader *)(op2+1);
1651
1652         /* Copy the fields we care about explicitly, leave the rest alone */
1653         *op2->o_hdr = *op->o_hdr;
1654         op2->o_tag = op->o_tag;
1655         op2->o_time = op->o_time;
1656         op2->o_bd = op->o_bd;
1657         op2->o_request = op->o_request;
1658
1659         if ( i ) {
1660                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1661                 ptr = (char *)(op2->ors_attrs+i+1);
1662                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1663                         op2->ors_attrs[i] = op->ors_attrs[i];
1664                         op2->ors_attrs[i].an_name.bv_val = ptr;
1665                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1666                 }
1667                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1668         } else {
1669                 ptr = (char *)(op2->o_hdr + 1);
1670         }
1671         op2->o_authz = op->o_authz;
1672         op2->o_ndn.bv_val = ptr;
1673         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1674         op2->o_dn = op2->o_ndn;
1675         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1676         op2->o_req_dn.bv_val = ptr;
1677         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1678         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1679         op2->o_req_ndn.bv_val = ptr;
1680         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1681         op2->ors_filterstr.bv_val = ptr;
1682         strcpy( ptr, so->s_filterstr.bv_val );
1683         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1684         op2->ors_filter = str2filter( ptr );
1685         so->s_op = op2;
1686
1687         /* Copy any cached group ACLs individually */
1688         op2->o_groups = NULL;
1689         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1690                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1691                 *g2 = *g1;
1692                 strcpy( g2->ga_ndn, g1->ga_ndn );
1693                 g2->ga_next = op2->o_groups;
1694                 op2->o_groups = g2;
1695         }
1696
1697         /* Add op2 to conn so abandon will find us */
1698         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1699         op->o_conn->c_n_ops_executing++;
1700         op->o_conn->c_n_ops_completed--;
1701         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1702         so->s_flags |= PS_IS_DETACHED;
1703         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1704 }
1705
1706 static int
1707 syncprov_search_response( Operation *op, SlapReply *rs )
1708 {
1709         searchstate *ss = op->o_callback->sc_private;
1710         slap_overinst *on = ss->ss_on;
1711         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1712
1713         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1714                 Attribute *a;
1715                 /* If we got a referral without a referral object, there's
1716                  * something missing that we cannot replicate. Just ignore it.
1717                  * The consumer will abort because we didn't send the expected
1718                  * control.
1719                  */
1720                 if ( !rs->sr_entry ) {
1721                         assert( rs->sr_entry != NULL );
1722                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1723                         return SLAP_CB_CONTINUE;
1724                 }
1725                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1726                 if ( a ) {
1727                         /* Make sure entry is less than the snaphot'd contextCSN */
1728                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1729                                 return LDAP_SUCCESS;
1730
1731                         /* Don't send the ctx entry twice */
1732                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1733                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1734                                 return LDAP_SUCCESS;
1735                 }
1736                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1737                         op->o_tmpmemctx );
1738                 rs->sr_ctrls[1] = NULL;
1739                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1740                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1741         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1742                 struct berval cookie;
1743
1744                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1745                         srs->sr_state.rid );
1746
1747                 /* Is this a regular refresh? */
1748                 if ( !ss->ss_so ) {
1749                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1750                                 op->o_tmpmemctx );
1751                         rs->sr_ctrls[1] = NULL;
1752                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1753                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1754                                         LDAP_SYNC_REFRESH_DELETES );
1755                 } else {
1756                         int locked = 0;
1757                 /* It's RefreshAndPersist, transition to Persist phase */
1758                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1759                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1760                                 &cookie, 1, NULL, 0 );
1761                         /* Flush any queued persist messages */
1762                         if ( ss->ss_so->s_res ) {
1763                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1764                                 locked = 1;
1765                                 syncprov_qplay( op, on, ss->ss_so );
1766                         }
1767
1768                         /* Turn off the refreshing flag */
1769                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1770                         if ( locked )
1771                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1772
1773                         /* Detach this Op from frontend control */
1774                         syncprov_detach_op( op, ss->ss_so );
1775
1776                         return LDAP_SUCCESS;
1777                 }
1778         }
1779
1780         return SLAP_CB_CONTINUE;
1781 }
1782
1783 static int
1784 syncprov_op_search( Operation *op, SlapReply *rs )
1785 {
1786         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1787         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1788         slap_callback   *cb;
1789         int gotstate = 0, nochange = 0, do_present = 1;
1790         syncops *sop = NULL;
1791         searchstate *ss;
1792         sync_control *srs;
1793         struct berval ctxcsn;
1794         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1795
1796         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1797
1798         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1799                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1800                 return rs->sr_err;
1801         }
1802
1803         srs = op->o_controls[slap_cids.sc_LDAPsync];
1804         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1805
1806         /* If this is a persistent search, set it up right away */
1807         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1808                 syncops so = {0};
1809                 fbase_cookie fc;
1810                 opcookie opc;
1811                 slap_callback sc;
1812
1813                 fc.fss = &so;
1814                 fc.fbase = 0;
1815                 so.s_eid = NOID;
1816                 so.s_op = op;
1817                 so.s_flags = PS_IS_REFRESHING;
1818                 /* syncprov_findbase expects to be called as a callback... */
1819                 sc.sc_private = &opc;
1820                 opc.son = on;
1821                 cb = op->o_callback;
1822                 op->o_callback = &sc;
1823                 rs->sr_err = syncprov_findbase( op, &fc );
1824                 op->o_callback = cb;
1825
1826                 if ( rs->sr_err != LDAP_SUCCESS ) {
1827                         send_ldap_result( op, rs );
1828                         return rs->sr_err;
1829                 }
1830                 sop = ch_malloc( sizeof( syncops ));
1831                 *sop = so;
1832                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1833                 sop->s_rid = srs->sr_state.rid;
1834                 sop->s_inuse = 1;
1835
1836                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1837                 sop->s_next = si->si_ops;
1838                 si->si_ops = sop;
1839                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1840         }
1841
1842         /* snapshot the ctxcsn */
1843         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1844         strcpy( csnbuf, si->si_ctxcsnbuf );
1845         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1846         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1847         ctxcsn.bv_val = csnbuf;
1848
1849         /* If we have a cookie, handle the PRESENT lookups */
1850         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1851                 sessionlog *sl;
1852
1853                 /* The cookie was validated when it was parsed, just use it */
1854
1855                 /* If just Refreshing and nothing has changed, shortcut it */
1856                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1857                         nochange = 1;
1858                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1859                                 LDAPControl     *ctrls[2];
1860
1861                                 ctrls[0] = NULL;
1862                                 ctrls[1] = NULL;
1863                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1864                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1865                                 rs->sr_ctrls = ctrls;
1866                                 rs->sr_err = LDAP_SUCCESS;
1867                                 send_ldap_result( op, rs );
1868                                 rs->sr_ctrls = NULL;
1869                                 return rs->sr_err;
1870                         }
1871                         goto shortcut;
1872                 }
1873                 /* Do we have a sessionlog for this search? */
1874                 sl=si->si_logs;
1875                 if ( sl ) {
1876                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1877                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1878                                 do_present = 0;
1879                                 /* mutex is unlocked in playlog */
1880                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1881                         } else {
1882                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1883                         }
1884                 }
1885                 /* Is the CSN still present in the database? */
1886                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1887                         /* No, so a reload is required */
1888 #if 0           /* the consumer doesn't seem to send this hint */
1889                         if ( op->o_sync_rhint == 0 ) {
1890                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1891                                 return rs->sr_err;
1892                         }
1893 #endif
1894                 } else {
1895                         gotstate = 1;
1896                         /* If changed and doing Present lookup, send Present UUIDs */
1897                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1898                                 LDAP_SUCCESS ) {
1899                                 send_ldap_result( op, rs );
1900                                 return rs->sr_err;
1901                         }
1902                 }
1903         }
1904
1905 shortcut:
1906         /* Append CSN range to search filter, save original filter
1907          * for persistent search evaluation
1908          */
1909         if ( sop ) {
1910                 sop->s_filterstr= op->ors_filterstr;
1911         }
1912
1913         /* If something changed, find the changes */
1914         if ( gotstate && !nochange ) {
1915                 Filter *fand, *fava;
1916
1917                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1918                 fand->f_choice = LDAP_FILTER_AND;
1919                 fand->f_next = NULL;
1920                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1921                 fand->f_and = fava;
1922                 fava->f_choice = LDAP_FILTER_GE;
1923                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1924                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1925 #ifdef LDAP_COMP_MATCH
1926                 fava->f_ava->aa_cf = NULL;
1927 #endif
1928                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1929                 fava->f_next = op->ors_filter;
1930                 op->ors_filter = fand;
1931                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1932         }
1933
1934         /* Let our callback add needed info to returned entries */
1935         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1936         ss = (searchstate *)(cb+1);
1937         ss->ss_on = on;
1938         ss->ss_so = sop;
1939         ss->ss_present = do_present;
1940         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
1941         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
1942         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
1943         cb->sc_response = syncprov_search_response;
1944         cb->sc_cleanup = syncprov_search_cleanup;
1945         cb->sc_private = ss;
1946         cb->sc_next = op->o_callback;
1947         op->o_callback = cb;
1948
1949 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1950         op->o_sync_mode &= SLAP_CONTROL_MASK;
1951 #endif
1952
1953         /* If this is a persistent search and no changes were reported during
1954          * the refresh phase, just invoke the response callback to transition
1955          * us into persist phase
1956          */
1957         if ( nochange ) {
1958                 rs->sr_err = LDAP_SUCCESS;
1959                 rs->sr_nentries = 0;
1960                 send_ldap_result( op, rs );
1961                 return rs->sr_err;
1962         }
1963         return SLAP_CB_CONTINUE;
1964 }
1965
1966 static int
1967 syncprov_operational(
1968         Operation *op,
1969         SlapReply *rs )
1970 {
1971         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1972         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1973
1974         if ( rs->sr_entry &&
1975                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1976
1977                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1978                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1979                         Attribute *a, **ap = NULL;
1980
1981                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1982                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1983                                         break;
1984                         }
1985
1986                         if ( !a ) {
1987                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1988
1989                                 a = ch_malloc( sizeof(Attribute));
1990                                 a->a_desc = slap_schema.si_ad_contextCSN;
1991                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1992                                 a->a_vals[1].bv_val = NULL;
1993                                 a->a_nvals = a->a_vals;
1994                                 a->a_next = NULL;
1995                                 a->a_flags = 0;
1996                                 *ap = a;
1997                         }
1998
1999                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2000                         if ( !ap ) {
2001                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2002                         } else {
2003                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2004                         }
2005                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2006                 }
2007         }
2008         return SLAP_CB_CONTINUE;
2009 }
2010
2011 enum {
2012         SP_CHKPT = 1,
2013         SP_SESSL
2014 };
2015
2016 static ConfigDriver sp_cf_gen;
2017
2018 static ConfigTable spcfg[] = {
2019         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2020                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2021                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2022                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2023         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2024                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2025                         "DESC 'Session log size in ops' "
2026                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2027         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2028 };
2029
2030 static ConfigOCs spocs[] = {
2031         { "( OLcfgOvOc:1.1 "
2032                 "NAME 'olcSyncProvConfig' "
2033                 "DESC 'SyncRepl Provider configuration' "
2034                 "SUP olcOverlayConfig "
2035                 "MAY ( olcSpCheckpoint $ olcSpSessionlog ) )",
2036                         Cft_Overlay, spcfg },
2037         { NULL, 0, NULL }
2038 };
2039
2040 static int
2041 sp_cf_gen(ConfigArgs *c)
2042 {
2043         slap_overinst           *on = (slap_overinst *)c->bi;
2044         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2045         int rc = 0;
2046
2047         if ( c->op == SLAP_CONFIG_EMIT ) {
2048                 switch ( c->type ) {
2049                 case SP_CHKPT:
2050                         if ( si->si_chkops || si->si_chktime ) {
2051                                 struct berval bv;
2052                                 bv.bv_len = sprintf( c->msg, "%d %d",
2053                                         si->si_chkops, si->si_chktime );
2054                                 bv.bv_val = c->msg;
2055                                 value_add_one( &c->rvalue_vals, &bv );
2056                         } else {
2057                                 rc = 1;
2058                         }
2059                         break;
2060                 case SP_SESSL:
2061                         if ( si->si_logs ) {
2062                                 c->value_int = si->si_logs->sl_size;
2063                         } else {
2064                                 rc = 1;
2065                         }
2066                         break;
2067                 }
2068                 return rc;
2069         } else if ( c->op == LDAP_MOD_DELETE ) {
2070                 switch ( c->type ) {
2071                 case SP_CHKPT:
2072                         si->si_chkops = 0;
2073                         si->si_chktime = 0;
2074                         break;
2075                 case SP_SESSL:
2076                         if ( si->si_logs )
2077                                 si->si_logs->sl_size = 0;
2078                         else
2079                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2080                         break;
2081                 }
2082                 return rc;
2083         }
2084         switch ( c->type ) {
2085         case SP_CHKPT:
2086                 si->si_chkops = atoi( c->argv[1] );
2087                 si->si_chktime = atoi( c->argv[2] ) * 60;
2088                 break;
2089         case SP_SESSL: {
2090                 sessionlog *sl;
2091                 int size = c->value_int;
2092
2093                 if ( size < 0 ) {
2094                         sprintf( c->msg, "%s size %d is negative",
2095                                 c->argv[0], size );
2096                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2097                         return ARG_BAD_CONF;
2098                 }
2099                 sl = si->si_logs;
2100                 if ( !sl ) {
2101                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2102                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2103                         sl->sl_mincsn.bv_len = 0;
2104                         sl->sl_num = 0;
2105                         sl->sl_head = sl->sl_tail = NULL;
2106                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2107                         si->si_logs = sl;
2108                 }
2109                 sl->sl_size = size;
2110                 }
2111                 break;
2112         }
2113         return rc;
2114 }
2115
2116 /* ITS#3456 we cannot run this search on the main thread, must use a
2117  * child thread in order to insure we have a big enough stack.
2118  */
2119 static void *
2120 syncprov_db_otask(
2121         void *ptr
2122 )
2123 {
2124         syncprov_findcsn( ptr, FIND_MAXCSN );
2125         return NULL;
2126 }
2127
2128 /* Read any existing contextCSN from the underlying db.
2129  * Then search for any entries newer than that. If no value exists,
2130  * just generate it. Cache whatever result.
2131  */
2132 static int
2133 syncprov_db_open(
2134     BackendDB *be
2135 )
2136 {
2137         slap_overinst   *on = (slap_overinst *) be->bd_info;
2138         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2139
2140         Connection conn;
2141         char opbuf[OPERATION_BUFFER_SIZE];
2142         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2143         Operation *op = (Operation *)opbuf;
2144         Entry *e;
2145         Attribute *a;
2146         int rc;
2147         void *thrctx = NULL;
2148
2149         if ( slapMode & SLAP_TOOL_MODE ) {
2150                 return 0;
2151         }
2152
2153         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2154         if ( rc ) {
2155                 return rc;
2156         }
2157
2158         thrctx = ldap_pvt_thread_pool_context();
2159         connection_fake_init( &conn, op, thrctx );
2160         op->o_bd = be;
2161         op->o_dn = be->be_rootdn;
2162         op->o_ndn = be->be_rootndn;
2163
2164         ctxcsnbuf[0] = '\0';
2165
2166         op->o_bd->bd_info = on->on_info->oi_orig;
2167         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2168                 slap_schema.si_ad_contextCSN, 0, &e );
2169
2170         if ( e ) {
2171                 ldap_pvt_thread_t tid;
2172
2173                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2174                 if ( a ) {
2175                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2176                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2177                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2178                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2179                                 si->si_ctxcsn.bv_len );
2180                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2181                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2182                 }
2183                 be_entry_release_rw( op, e, 0 );
2184                 op->o_bd->bd_info = (BackendInfo *)on;
2185                 op->o_req_dn = be->be_suffix[0];
2186                 op->o_req_ndn = be->be_nsuffix[0];
2187                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2188                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2189                 ldap_pvt_thread_join( tid, NULL );
2190         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2191                 /* If we're also a consumer, and we didn't find the context entry,
2192                  * then don't generate anything, wait for our provider to send it
2193                  * to us.
2194                  */
2195                 goto out;
2196         }
2197
2198         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2199                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2200                                 &si->si_ctxcsn, 0 );
2201         }
2202
2203         /* If our ctxcsn is different from what was read from the root
2204          * entry, make sure we do a checkpoint on close
2205          */
2206         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2207                 si->si_numops++;
2208         }
2209
2210 out:
2211         op->o_bd->bd_info = (BackendInfo *)on;
2212         ldap_pvt_thread_pool_context_reset( thrctx );
2213         return 0;
2214 }
2215
2216 /* Write the current contextCSN into the underlying db.
2217  */
2218 static int
2219 syncprov_db_close(
2220     BackendDB *be
2221 )
2222 {
2223     slap_overinst   *on = (slap_overinst *) be->bd_info;
2224     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2225         int i;
2226
2227         if ( slapMode & SLAP_TOOL_MODE ) {
2228                 return 0;
2229         }
2230         if ( si->si_numops ) {
2231                 Connection conn;
2232                 char opbuf[OPERATION_BUFFER_SIZE];
2233                 Operation *op = (Operation *)opbuf;
2234                 SlapReply rs = {REP_RESULT};
2235                 void *thrctx;
2236
2237                 thrctx = ldap_pvt_thread_pool_context();
2238                 connection_fake_init( &conn, op, thrctx );
2239                 op->o_bd = be;
2240                 op->o_dn = be->be_rootdn;
2241                 op->o_ndn = be->be_rootndn;
2242                 syncprov_checkpoint( op, &rs, on );
2243                 ldap_pvt_thread_pool_context_reset( thrctx );
2244         }
2245
2246     return 0;
2247 }
2248
2249 static int
2250 syncprov_db_init(
2251         BackendDB *be
2252 )
2253 {
2254         slap_overinst   *on = (slap_overinst *)be->bd_info;
2255         syncprov_info_t *si;
2256
2257         si = ch_calloc(1, sizeof(syncprov_info_t));
2258         on->on_bi.bi_private = si;
2259         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2260         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2261         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2262         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2263
2264         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2265         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2266         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2267         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2268
2269         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2270         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2271
2272         return 0;
2273 }
2274
2275 static int
2276 syncprov_db_destroy(
2277         BackendDB *be
2278 )
2279 {
2280         slap_overinst   *on = (slap_overinst *)be->bd_info;
2281         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2282
2283         if ( si ) {
2284                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2285                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2286                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2287                 ch_free( si );
2288         }
2289
2290         return 0;
2291 }
2292
2293 static int syncprov_parseCtrl (
2294         Operation *op,
2295         SlapReply *rs,
2296         LDAPControl *ctrl )
2297 {
2298         ber_tag_t tag;
2299         BerElementBuffer berbuf;
2300         BerElement *ber = (BerElement *)&berbuf;
2301         ber_int_t mode;
2302         ber_len_t len;
2303         struct berval cookie = BER_BVNULL;
2304         sync_control *sr;
2305         int rhint = 0;
2306
2307         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2308                 rs->sr_text = "Sync control specified multiple times";
2309                 return LDAP_PROTOCOL_ERROR;
2310         }
2311
2312         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2313                 rs->sr_text = "Sync control specified with pagedResults control";
2314                 return LDAP_PROTOCOL_ERROR;
2315         }
2316
2317         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2318                 rs->sr_text = "Sync control value is empty (or absent)";
2319                 return LDAP_PROTOCOL_ERROR;
2320         }
2321
2322         /* Parse the control value
2323          *      syncRequestValue ::= SEQUENCE {
2324          *              mode   ENUMERATED {
2325          *                      -- 0 unused
2326          *                      refreshOnly             (1),
2327          *                      -- 2 reserved
2328          *                      refreshAndPersist       (3)
2329          *              },
2330          *              cookie  syncCookie OPTIONAL
2331          *      }
2332          */
2333
2334         ber_init2( ber, &ctrl->ldctl_value, 0 );
2335
2336         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2337                 rs->sr_text = "Sync control : mode decoding error";
2338                 return LDAP_PROTOCOL_ERROR;
2339         }
2340
2341         switch( mode ) {
2342         case LDAP_SYNC_REFRESH_ONLY:
2343                 mode = SLAP_SYNC_REFRESH;
2344                 break;
2345         case LDAP_SYNC_REFRESH_AND_PERSIST:
2346                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2347                 break;
2348         default:
2349                 rs->sr_text = "Sync control : unknown update mode";
2350                 return LDAP_PROTOCOL_ERROR;
2351         }
2352
2353         tag = ber_peek_tag( ber, &len );
2354
2355         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2356                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2357                         rs->sr_text = "Sync control : cookie decoding error";
2358                         return LDAP_PROTOCOL_ERROR;
2359                 }
2360         }
2361         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2362                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2363                         rs->sr_text = "Sync control : rhint decoding error";
2364                         return LDAP_PROTOCOL_ERROR;
2365                 }
2366         }
2367         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2368                         rs->sr_text = "Sync control : decoding error";
2369                         return LDAP_PROTOCOL_ERROR;
2370         }
2371         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2372         sr->sr_rhint = rhint;
2373         if (!BER_BVISNULL(&cookie)) {
2374                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2375                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2376                 if ( sr->sr_state.rid == -1 ) {
2377                         rs->sr_text = "Sync control : cookie parsing error";
2378                         return LDAP_PROTOCOL_ERROR;
2379                 }
2380         }
2381
2382         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2383
2384         op->o_sync = ctrl->ldctl_iscritical
2385                 ? SLAP_CONTROL_CRITICAL
2386                 : SLAP_CONTROL_NONCRITICAL;
2387
2388         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2389
2390         return LDAP_SUCCESS;
2391 }
2392
2393 /* This overlay is set up for dynamic loading via moduleload. For static
2394  * configuration, you'll need to arrange for the slap_overinst to be
2395  * initialized and registered by some other function inside slapd.
2396  */
2397
2398 static slap_overinst            syncprov;
2399
2400 int
2401 syncprov_init()
2402 {
2403         int rc;
2404
2405         rc = register_supported_control( LDAP_CONTROL_SYNC,
2406                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2407                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2408         if ( rc != LDAP_SUCCESS ) {
2409                 Debug( LDAP_DEBUG_ANY,
2410                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2411                 return rc;
2412         }
2413
2414         syncprov.on_bi.bi_type = "syncprov";
2415         syncprov.on_bi.bi_db_init = syncprov_db_init;
2416         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2417         syncprov.on_bi.bi_db_open = syncprov_db_open;
2418         syncprov.on_bi.bi_db_close = syncprov_db_close;
2419
2420         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2421         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2422
2423         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2424         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2425         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2426         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2427         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2428         syncprov.on_bi.bi_op_search = syncprov_op_search;
2429         syncprov.on_bi.bi_extended = syncprov_op_extended;
2430         syncprov.on_bi.bi_operational = syncprov_operational;
2431
2432         syncprov.on_bi.bi_cf_ocs = spocs;
2433
2434         rc = config_register_schema( spcfg, spocs );
2435         if ( rc ) return rc;
2436
2437         return overlay_register( &syncprov );
2438 }
2439
2440 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2441 int
2442 init_module( int argc, char *argv[] )
2443 {
2444         return syncprov_init();
2445 }
2446 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2447
2448 #endif /* defined(SLAPD_OVER_SYNCPROV) */