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