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
 788                 /* If syncprov_qplay returned any other error, bail out. */
 789                 if ( rs.sr_err ) {
 790                         return rs.sr_err;
 791                 }
 792         } else {
 793                 /* Queueing not allowed and conn is busy, give up */
 794                 if ( sop.o_conn->c_writewaiter )
 795                         return LDAP_BUSY;
 796         }
 797
 798         ctrls[1] = NULL;
 799         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 800
 801         e_uuid.e_attrs = &a_uuid;
 802         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 803         a_uuid.a_nvals = &opc->suuid;
 804         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 805                 mode, ctrls, 0, 1, &cookie );
 806
 807         rs.sr_ctrls = ctrls;
 808         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 809         switch( mode ) {
 810         case LDAP_SYNC_ADD:
 811                 rs.sr_entry = *e;
 812                 if ( rs.sr_entry->e_private )
 813                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 814                 if ( opc->sreference ) {
 815                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 816                         send_search_reference( &sop, &rs );
 817                         ber_bvarray_free( rs.sr_ref );
 818                         if ( !rs.sr_entry )
 819                                 *e = NULL;
 820                         break;
 821                 }
 822                 /* fallthru */
 823         case LDAP_SYNC_MODIFY:
 824                 rs.sr_entry = *e;
 825                 if ( rs.sr_entry->e_private )
 826                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 827                 rs.sr_attrs = sop.ors_attrs;
 828                 send_search_entry( &sop, &rs );
 829                 if ( !rs.sr_entry )
 830                         *e = NULL;
 831                 break;
 832         case LDAP_SYNC_DELETE:
 833                 e_uuid.e_attrs = NULL;
 834                 e_uuid.e_name = opc->sdn;
 835                 e_uuid.e_nname = opc->sndn;
 836                 rs.sr_entry = &e_uuid;
 837                 if ( opc->sreference ) {
 838                         struct berval bv = BER_BVNULL;
 839                         rs.sr_ref = &bv;
 840                         send_search_reference( &sop, &rs );
 841                 } else {
 842                         send_search_entry( &sop, &rs );
 843                 }
 844                 break;
 845         default:
 846                 assert(0);
 847         }
 848         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 849         op->o_private = sop.o_private;
 850         rs.sr_ctrls = NULL;
 851         /* Check queue again here; if we were hanging in a send and eventually
 852          * recovered, there may be more to send now. But don't check if the
 853          * original psearch has been abandoned.
 854          */
 855         if ( so->s_op->o_abandon )
 856                 return SLAPD_ABANDON;
 857
 858         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 859                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 860                 rs.sr_err = syncprov_qplay( &sop, on, so );
 861                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 862         }
 863         return rs.sr_err;
 864 }
 865
 866 static void
 867 syncprov_free_syncop( syncops *so )
 868 {
 869         syncres *sr, *srnext;
 870         GroupAssertion *ga, *gnext;
 871
 872         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 873         so->s_inuse--;
 874         if ( so->s_inuse > 0 ) {
 875                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 876                 return;
 877         }
 878         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 879         if ( so->s_flags & PS_IS_DETACHED ) {
 880                 filter_free( so->s_op->ors_filter );
 881                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 882                         gnext = ga->ga_next;
 883                         ch_free( ga );
 884                 }
 885                 ch_free( so->s_op );
 886         }
 887         ch_free( so->s_base.bv_val );
 888         for ( sr=so->s_res; sr; sr=srnext ) {
 889                 srnext = sr->s_next;
 890                 ch_free( sr );
 891         }
 892         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 893         ch_free( so );
 894 }
 895
 896 static int
 897 syncprov_drop_psearch( syncops *so, int lock )
 898 {
 899         if ( so->s_flags & PS_IS_DETACHED ) {
 900                 if ( lock )
 901                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 902                 so->s_op->o_conn->c_n_ops_executing--;
 903                 so->s_op->o_conn->c_n_ops_completed++;
 904                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 905                         o_next );
 906                 if ( lock )
 907                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 908         }
 909         syncprov_free_syncop( so );
 910
 911         return 0;
 912 }
 913
 914 static int
 915 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 916 {
 917         slap_callback *sc = op->o_callback;
 918         op->o_callback = sc->sc_next;
 919         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 920         op->o_tmpfree( sc, op->o_tmpmemctx );
 921         return 0;
 922 }
 923
 924 static int
 925 syncprov_op_abandon( Operation *op, SlapReply *rs )
 926 {
 927         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 928         syncprov_info_t         *si = on->on_bi.bi_private;
 929         syncops *so, *soprev;
 930
 931         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 932         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 933                 soprev=so, so=so->s_next ) {
 934                 if ( so->s_op->o_connid == op->o_connid &&
 935                         so->s_op->o_msgid == op->orn_msgid ) {
 936                                 so->s_op->o_abandon = 1;
 937                                 soprev->s_next = so->s_next;
 938                                 break;
 939                 }
 940         }
 941         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 942         if ( so ) {
 943                 /* Is this really a Cancel exop? */
 944                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 945                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 946                         rs->sr_err = LDAP_CANCELLED;
 947                         send_ldap_result( so->s_op, rs );
 948                         if ( so->s_flags & PS_IS_DETACHED ) {
 949                                 slap_callback *cb;
 950                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 951                                 cb->sc_cleanup = syncprov_ab_cleanup;
 952                                 cb->sc_next = op->o_callback;
 953                                 cb->sc_private = so;
 954                                 return SLAP_CB_CONTINUE;
 955                         }
 956                 }
 957                 syncprov_drop_psearch( so, 0 );
 958         }
 959         return SLAP_CB_CONTINUE;
 960 }
 961
 962 /* Find which persistent searches are affected by this operation */
 963 static void
 964 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 965 {
 966         slap_overinst *on = opc->son;
 967         syncprov_info_t         *si = on->on_bi.bi_private;
 968
 969         fbase_cookie fc;
 970         syncops *ss, *sprev, *snext;
 971         Entry *e;
 972         Attribute *a;
 973         int rc;
 974         struct berval newdn;
 975         int freefdn = 0;
 976
 977         fc.fdn = &op->o_req_ndn;
 978         /* compute new DN */
 979         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 980                 struct berval pdn;
 981                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 982                 else dnParent( fc.fdn, &pdn );
 983                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 984                 fc.fdn = &newdn;
 985                 freefdn = 1;
 986         }
 987         if ( op->o_tag != LDAP_REQ_ADD ) {
 988                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 989                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 990                 /* If we're sending responses now, make a copy and unlock the DB */
 991                 if ( e && !saveit ) {
 992                         Entry *e2 = entry_dup( e );
 993                         be_entry_release_rw( op, e, 0 );
 994                         e = e2;
 995                 }
 996                 op->o_bd->bd_info = (BackendInfo *)on;
 997                 if ( rc ) return;
 998         } else {
 999                 e = op->ora_e;
1000         }
1001
1002         if ( saveit ) {
1003                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1004                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1005                 opc->sreference = is_entry_referral( e );
1006         }
1007         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1008                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1009                 if ( a )
1010                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1011         }
1012
1013         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1014         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1015                 sprev = ss, ss=snext)
1016         {
1017                 syncmatches *sm;
1018                 int found = 0;
1019
1020                 snext = ss->s_next;
1021                 /* validate base */
1022                 fc.fss = ss;
1023                 fc.fbase = 0;
1024                 fc.fscope = 0;
1025
1026                 /* If the base of the search is missing, signal a refresh */
1027                 rc = syncprov_findbase( op, &fc );
1028                 if ( rc != LDAP_SUCCESS ) {
1029                         SlapReply rs = {REP_RESULT};
1030                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1031                                 "search base has changed" );
1032                         sprev->s_next = snext;
1033                         syncprov_drop_psearch( ss, 1 );
1034                         continue;
1035                 }
1036
1037                 /* If we're sending results now, look for this op in old matches */
1038                 if ( !saveit ) {
1039                         syncmatches *old;
1040                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1041                                 old=sm, sm=sm->sm_next ) {
1042                                 if ( sm->sm_op == ss ) {
1043                                         found = 1;
1044                                         old->sm_next = sm->sm_next;
1045                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1046                                         break;
1047                                 }
1048                         }
1049                 }
1050
1051                 /* check if current o_req_dn is in scope and matches filter */
1052                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1053                         LDAP_COMPARE_TRUE ) {
1054                         if ( saveit ) {
1055                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1056                                 sm->sm_next = opc->smatches;
1057                                 sm->sm_op = ss;
1058                                 ss->s_inuse++;
1059                                 opc->smatches = sm;
1060                         } else {
1061                                 /* if found send UPDATE else send ADD */
1062                                 ss->s_inuse++;
1063                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1064                                 syncprov_sendresp( op, opc, ss, &e,
1065                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1066                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1067                                 ss->s_inuse--;
1068                         }
1069                 } else if ( !saveit && found ) {
1070                         /* send DELETE */
1071                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1072                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1073                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1074                 }
1075         }
1076         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1077 done:
1078         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1079                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1080                 be_entry_release_rw( op, e, 0 );
1081                 op->o_bd->bd_info = (BackendInfo *)on;
1082         }
1083         if ( freefdn ) {
1084                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1085         }
1086 }
1087
1088 static int
1089 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1090 {
1091         slap_callback *cb = op->o_callback;
1092         opcookie *opc = cb->sc_private;
1093         slap_overinst *on = opc->son;
1094         syncprov_info_t         *si = on->on_bi.bi_private;
1095         syncmatches *sm, *snext;
1096         modtarget *mt, mtdummy;
1097
1098         for (sm = opc->smatches; sm; sm=snext) {
1099                 snext = sm->sm_next;
1100                 syncprov_free_syncop( sm->sm_op );
1101                 op->o_tmpfree( sm, op->o_tmpmemctx );
1102         }
1103
1104         /* Remove op from lock table */
1105         mtdummy.mt_op = op;
1106         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1107         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1108         if ( mt ) {
1109                 modinst *mi = mt->mt_mods;
1110
1111                 /* If there are more, promote the next one */
1112                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1113                 if ( mi->mi_next ) {
1114                         mt->mt_mods = mi->mi_next;
1115                         mt->mt_op = mt->mt_mods->mi_op;
1116                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1117                 } else {
1118                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1119                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1120                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1121                         ch_free( mt );
1122                 }
1123         }
1124         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1125         if ( !BER_BVISNULL( &opc->suuid ))
1126                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1127         if ( !BER_BVISNULL( &opc->sndn ))
1128                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1129         if ( !BER_BVISNULL( &opc->sdn ))
1130                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1131         op->o_callback = cb->sc_next;
1132         op->o_tmpfree(cb, op->o_tmpmemctx);
1133
1134         return 0;
1135 }
1136
1137 static void
1138 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1139 {
1140         syncprov_info_t         *si = on->on_bi.bi_private;
1141         Modifications mod;
1142         Operation opm;
1143         struct berval bv[2];
1144         slap_callback cb = {0};
1145         int manage = get_manageDSAit(op);
1146
1147         mod.sml_values = bv;
1148         bv[1].bv_val = NULL;
1149         bv[0] = si->si_ctxcsn;
1150         mod.sml_nvalues = NULL;
1151         mod.sml_desc = slap_schema.si_ad_contextCSN;
1152         mod.sml_op = LDAP_MOD_REPLACE;
1153         mod.sml_next = NULL;
1154
1155         cb.sc_response = slap_null_cb;
1156         opm = *op;
1157         opm.o_tag = LDAP_REQ_MODIFY;
1158         opm.o_callback = &cb;
1159         opm.orm_modlist = &mod;
1160         opm.o_req_dn = op->o_bd->be_suffix[0];
1161         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1162         opm.o_bd->bd_info = on->on_info->oi_orig;
1163         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1164         opm.o_bd->be_modify( &opm, rs );
1165         opm.o_managedsait = manage;
1166 }
1167
1168 static void
1169 syncprov_add_slog( Operation *op, struct berval *csn )
1170 {
1171         opcookie *opc = op->o_callback->sc_private;
1172         slap_overinst *on = opc->son;
1173         syncprov_info_t         *si = on->on_bi.bi_private;
1174         sessionlog *sl;
1175         slog_entry *se;
1176
1177         sl = si->si_logs;
1178         {
1179                 /* Allocate a record. UUIDs are not NUL-terminated. */
1180                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1181                         csn->bv_len + 1 );
1182                 se->se_next = NULL;
1183                 se->se_tag = op->o_tag;
1184
1185                 se->se_uuid.bv_val = (char *)(se+1);
1186                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len + 1;
1187                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1188                 se->se_uuid.bv_len = opc->suuid.bv_len;
1189
1190                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1191                 se->se_csn.bv_val[csn->bv_len] = '\0';
1192                 se->se_csn.bv_len = csn->bv_len;
1193
1194                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1195                 if ( sl->sl_head ) {
1196                         sl->sl_tail->se_next = se;
1197                 } else {
1198                         sl->sl_head = se;
1199                 }
1200                 sl->sl_tail = se;
1201                 sl->sl_num++;
1202                 while ( sl->sl_num > sl->sl_size ) {
1203                         se = sl->sl_head;
1204                         sl->sl_head = se->se_next;
1205                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1206                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1207                         ch_free( se );
1208                         sl->sl_num--;
1209                         if ( !sl->sl_head ) {
1210                                 sl->sl_tail = NULL;
1211                         }
1212                 }
1213                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1214         }
1215 }
1216
1217 /* Just set a flag if we found the matching entry */
1218 static int
1219 playlog_cb( Operation *op, SlapReply *rs )
1220 {
1221         if ( rs->sr_type == REP_SEARCH ) {
1222                 op->o_callback->sc_private = (void *)1;
1223         }
1224         return rs->sr_err;
1225 }
1226
1227 /* enter with sl->sl_mutex locked, release before returning */
1228 static void
1229 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1230         struct berval *oldcsn, struct berval *ctxcsn )
1231 {
1232         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1233         syncprov_info_t         *si = on->on_bi.bi_private;
1234         slog_entry *se;
1235         int i, j, ndel, num, nmods, mmods;
1236         BerVarray uuids;
1237
1238         if ( !sl->sl_num ) {
1239                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1240                 return;
1241         }
1242
1243         num = sl->sl_num;
1244         i = 0;
1245         nmods = 0;
1246
1247         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1248                 num * UUID_LEN, op->o_tmpmemctx );
1249
1250         uuids[0].bv_val = (char *)(uuids + num + 1);
1251
1252         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1253          * and everything else at the end. Do this first so we can
1254          * unlock the list mutex.
1255          */
1256         for ( se=sl->sl_head; se; se=se->se_next ) {
1257                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1258                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1259                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1260                         j = i;
1261                         i++;
1262                 } else {
1263                         nmods++;
1264                         j = num - nmods;
1265                 }
1266                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1267                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1268                 uuids[j].bv_len = UUID_LEN;
1269         }
1270         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1271
1272         ndel = i;
1273
1274         /* Zero out unused slots */
1275         for ( i=ndel; i < num - nmods; i++ )
1276                 uuids[i].bv_len = 0;
1277
1278         /* Mods must be validated to see if they belong in this delete set.
1279          */
1280
1281         mmods = nmods;
1282         /* Strip any duplicates */
1283         for ( i=0; i<nmods; i++ ) {
1284                 for ( j=0; j<ndel; j++ ) {
1285                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1286                                 uuids[num - 1 - i].bv_len = 0;
1287                                 mmods --;
1288                                 break;
1289                         }
1290                 }
1291                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1292                 for ( j=0; j<i; j++ ) {
1293                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1294                                 uuids[num - 1 - i].bv_len = 0;
1295                                 mmods --;
1296                                 break;
1297                         }
1298                 }
1299         }
1300
1301         if ( mmods ) {
1302                 Operation fop;
1303                 SlapReply frs = { REP_RESULT };
1304                 int rc;
1305                 Filter mf, af;
1306 #ifdef LDAP_COMP_MATCH
1307                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1308 #else
1309                 AttributeAssertion eq;
1310 #endif
1311                 slap_callback cb = {0};
1312
1313                 fop = *op;
1314
1315                 fop.o_sync_mode = 0;
1316                 fop.o_callback = &cb;
1317                 fop.ors_limit = NULL;
1318                 fop.ors_tlimit = SLAP_NO_LIMIT;
1319                 fop.ors_attrs = slap_anlist_all_attributes;
1320                 fop.ors_attrsonly = 0;
1321                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1322
1323                 af.f_choice = LDAP_FILTER_AND;
1324                 af.f_next = NULL;
1325                 af.f_and = &mf;
1326                 mf.f_choice = LDAP_FILTER_EQUALITY;
1327                 mf.f_ava = &eq;
1328                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1329                 mf.f_next = fop.ors_filter;
1330
1331                 fop.ors_filter = &af;
1332
1333                 cb.sc_response = playlog_cb;
1334                 fop.o_bd->bd_info = on->on_info->oi_orig;
1335
1336                 for ( i=ndel; i<num; i++ ) {
1337                         if ( uuids[i].bv_len == 0 ) continue;
1338
1339                         mf.f_av_value = uuids[i];
1340                         cb.sc_private = NULL;
1341                         fop.ors_slimit = 1;
1342                         rc = fop.o_bd->be_search( &fop, &frs );
1343
1344                         /* If entry was not found, add to delete list */
1345                         if ( !cb.sc_private ) {
1346                                 uuids[ndel++] = uuids[i];
1347                         }
1348                 }
1349                 fop.o_bd->bd_info = (BackendInfo *)on;
1350         }
1351         if ( ndel ) {
1352                 uuids[ndel].bv_val = NULL;
1353                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1354         }
1355 }
1356
1357 static int
1358 syncprov_op_response( Operation *op, SlapReply *rs )
1359 {
1360         opcookie *opc = op->o_callback->sc_private;
1361         slap_overinst *on = opc->son;
1362         syncprov_info_t         *si = on->on_bi.bi_private;
1363         syncmatches *sm;
1364
1365         if ( rs->sr_err == LDAP_SUCCESS )
1366         {
1367                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1368                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1369
1370                 /* Update our context CSN */
1371                 cbuf[0] = '\0';
1372                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1373                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1374                 if ( !BER_BVISNULL( &maxcsn ) ) {
1375                         strcpy( cbuf, maxcsn.bv_val );
1376                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1377                                 strcpy( si->si_ctxcsnbuf, cbuf );
1378                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1379                         }
1380                 }
1381
1382                 /* Don't do any processing for consumer contextCSN updates */
1383                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1384                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1385                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1386                         return SLAP_CB_CONTINUE;
1387                 }
1388
1389                 si->si_numops++;
1390                 if ( si->si_chkops || si->si_chktime ) {
1391                         int do_check=0;
1392                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1393                                 do_check = 1;
1394                                 si->si_numops = 0;
1395                         }
1396                         if ( si->si_chktime &&
1397                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1398                                 do_check = 1;
1399                                 si->si_chklast = op->o_time;
1400                         }
1401                         if ( do_check ) {
1402                                 syncprov_checkpoint( op, rs, on );
1403                         }
1404                 }
1405                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1406
1407                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1408                 opc->sctxcsn.bv_val = cbuf;
1409
1410                 /* Handle any persistent searches */
1411                 if ( si->si_ops ) {
1412                         switch(op->o_tag) {
1413                         case LDAP_REQ_ADD:
1414                         case LDAP_REQ_MODIFY:
1415                         case LDAP_REQ_MODRDN:
1416                         case LDAP_REQ_EXTENDED:
1417                                 syncprov_matchops( op, opc, 0 );
1418                                 break;
1419                         case LDAP_REQ_DELETE:
1420                                 /* for each match in opc->smatches:
1421                                  *   send DELETE msg
1422                                  */
1423                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1424                                         if ( sm->sm_op->s_op->o_abandon )
1425                                                 continue;
1426                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1427                                                 LDAP_SYNC_DELETE, 1 );
1428                                 }
1429                                 break;
1430                         }
1431                 }
1432
1433                 /* Add any log records */
1434                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1435                         syncprov_add_slog( op, &curcsn );
1436                 }
1437
1438         }
1439         return SLAP_CB_CONTINUE;
1440 }
1441
1442 /* We don't use a subentry to store the context CSN any more.
1443  * We expose the current context CSN as an operational attribute
1444  * of the suffix entry.
1445  */
1446 static int
1447 syncprov_op_compare( Operation *op, SlapReply *rs )
1448 {
1449         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1450         syncprov_info_t         *si = on->on_bi.bi_private;
1451         int rc = SLAP_CB_CONTINUE;
1452
1453         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1454                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1455         {
1456                 Entry e = {0};
1457                 Attribute a = {0};
1458                 struct berval bv[2];
1459
1460                 e.e_name = op->o_bd->be_suffix[0];
1461                 e.e_nname = op->o_bd->be_nsuffix[0];
1462
1463                 BER_BVZERO( &bv[1] );
1464                 bv[0] = si->si_ctxcsn;
1465
1466                 a.a_desc = slap_schema.si_ad_contextCSN;
1467                 a.a_vals = bv;
1468                 a.a_nvals = a.a_vals;
1469
1470                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1471
1472                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1473                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1474                 if ( ! rs->sr_err ) {
1475                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1476                         goto return_results;
1477                 }
1478
1479                 if ( get_assert( op ) &&
1480                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1481                 {
1482                         rs->sr_err = LDAP_ASSERTION_FAILED;
1483                         goto return_results;
1484                 }
1485
1486
1487                 rs->sr_err = LDAP_COMPARE_FALSE;
1488
1489                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1490                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1491                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1492                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1493                 {
1494                         rs->sr_err = LDAP_COMPARE_TRUE;
1495                 }
1496
1497 return_results:;
1498
1499                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1500
1501                 send_ldap_result( op, rs );
1502
1503                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1504                         rs->sr_err = LDAP_SUCCESS;
1505                 }
1506                 rc = rs->sr_err;
1507         }
1508
1509         return rc;
1510 }
1511
1512 static int
1513 syncprov_op_mod( Operation *op, SlapReply *rs )
1514 {
1515         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1516         syncprov_info_t         *si = on->on_bi.bi_private;
1517
1518         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1519                 sizeof(opcookie) +
1520                 (si->si_ops ? sizeof(modinst) : 0 ),
1521                 op->o_tmpmemctx);
1522         opcookie *opc = (opcookie *)(cb+1);
1523         opc->son = on;
1524         cb->sc_response = syncprov_op_response;
1525         cb->sc_cleanup = syncprov_op_cleanup;
1526         cb->sc_private = opc;
1527         cb->sc_next = op->o_callback;
1528         op->o_callback = cb;
1529
1530         /* If there are active persistent searches, lock this operation.
1531          * See seqmod.c for the locking logic on its own.
1532          */
1533         if ( si->si_ops ) {
1534                 modtarget *mt, mtdummy;
1535                 modinst *mi;
1536
1537                 mi = (modinst *)(opc+1);
1538                 mi->mi_op = op;
1539
1540                 /* See if we're already modifying this entry... */
1541                 mtdummy.mt_op = op;
1542                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1543                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1544                 if ( mt ) {
1545                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1546                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1547                         mt->mt_tail->mi_next = mi;
1548                         mt->mt_tail = mi;
1549                         /* wait for this op to get to head of list */
1550                         while ( mt->mt_mods != mi ) {
1551                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1552                                 ldap_pvt_thread_yield();
1553                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1554
1555                                 /* clean up if the caller is giving up */
1556                                 if ( op->o_abandon ) {
1557                                         modinst *m2;
1558                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1559                                                 m2 = m2->mi_next );
1560                                         m2->mi_next = mi->mi_next;
1561                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1562                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1563                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1564                                         return SLAPD_ABANDON;
1565                                 }
1566                         }
1567                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1568                 } else {
1569                         /* Record that we're modifying this entry now */
1570                         mt = ch_malloc( sizeof(modtarget) );
1571                         mt->mt_mods = mi;
1572                         mt->mt_tail = mi;
1573                         mt->mt_op = mi->mi_op;
1574                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1575                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1576                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1577                 }
1578         }
1579
1580         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1581                 syncprov_matchops( op, opc, 1 );
1582
1583         return SLAP_CB_CONTINUE;
1584 }
1585
1586 static int
1587 syncprov_op_extended( Operation *op, SlapReply *rs )
1588 {
1589         if ( exop_is_write( op ))
1590                 return syncprov_op_mod( op, rs );
1591
1592         return SLAP_CB_CONTINUE;
1593 }
1594
1595 typedef struct searchstate {
1596         slap_overinst *ss_on;
1597         syncops *ss_so;
1598         int ss_present;
1599 } searchstate;
1600
1601 static int
1602 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1603 {
1604         if ( rs->sr_ctrls ) {
1605                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1606                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1607                 rs->sr_ctrls = NULL;
1608         }
1609         return 0;
1610 }
1611
1612 static void
1613 syncprov_detach_op( Operation *op, syncops *so )
1614 {
1615         Operation *op2;
1616         int i, alen = 0;
1617         size_t size;
1618         char *ptr;
1619         GroupAssertion *g1, *g2;
1620
1621         /* count the search attrs */
1622         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1623                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1624         }
1625         /* Make a new copy of the operation */
1626         size = sizeof(Operation) + sizeof(Opheader) +
1627                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1628                 op->o_req_dn.bv_len + 1 +
1629                 op->o_req_ndn.bv_len + 1 +
1630                 op->o_ndn.bv_len + 1 +
1631                 so->s_filterstr.bv_len + 1;
1632         op2 = (Operation *)ch_calloc( 1, size );
1633         op2->o_hdr = (Opheader *)(op2+1);
1634
1635         /* Copy the fields we care about explicitly, leave the rest alone */
1636         *op2->o_hdr = *op->o_hdr;
1637         op2->o_tag = op->o_tag;
1638         op2->o_time = op->o_time;
1639         op2->o_bd = op->o_bd;
1640         op2->o_request = op->o_request;
1641
1642         if ( i ) {
1643                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1644                 ptr = (char *)(op2->ors_attrs+i+1);
1645                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1646                         op2->ors_attrs[i] = op->ors_attrs[i];
1647                         op2->ors_attrs[i].an_name.bv_val = ptr;
1648                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1649                 }
1650                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1651         } else {
1652                 ptr = (char *)(op2->o_hdr + 1);
1653         }
1654         op2->o_authz = op->o_authz;
1655         op2->o_ndn.bv_val = ptr;
1656         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1657         op2->o_dn = op2->o_ndn;
1658         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1659         op2->o_req_dn.bv_val = ptr;
1660         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1661         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1662         op2->o_req_ndn.bv_val = ptr;
1663         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1664         op2->ors_filterstr.bv_val = ptr;
1665         strcpy( ptr, so->s_filterstr.bv_val );
1666         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1667         op2->ors_filter = str2filter( ptr );
1668         so->s_op = op2;
1669
1670         /* Copy any cached group ACLs individually */
1671         op2->o_groups = NULL;
1672         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1673                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1674                 *g2 = *g1;
1675                 strcpy( g2->ga_ndn, g1->ga_ndn );
1676                 g2->ga_next = op2->o_groups;
1677                 op2->o_groups = g2;
1678         }
1679
1680         /* Add op2 to conn so abandon will find us */
1681         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1682         op->o_conn->c_n_ops_executing++;
1683         op->o_conn->c_n_ops_completed--;
1684         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1685         so->s_flags |= PS_IS_DETACHED;
1686         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1687 }
1688
1689 static int
1690 syncprov_search_response( Operation *op, SlapReply *rs )
1691 {
1692         searchstate *ss = op->o_callback->sc_private;
1693         slap_overinst *on = ss->ss_on;
1694         syncprov_info_t         *si = on->on_bi.bi_private;
1695         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1696
1697         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1698                 int i;
1699                 /* If we got a referral without a referral object, there's
1700                  * something missing that we cannot replicate. Just ignore it.
1701                  * The consumer will abort because we didn't send the expected
1702                  * control.
1703                  */
1704                 if ( !rs->sr_entry ) {
1705                         assert( rs->sr_entry );
1706                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1707                         return SLAP_CB_CONTINUE;
1708                 }
1709                 if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1710                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1711                                 slap_schema.si_ad_entryCSN );
1712
1713                         /* Don't send the ctx entry twice */
1714                         if ( a && bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1715                                 return LDAP_SUCCESS;
1716                 }
1717                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1718                         op->o_tmpmemctx );
1719                 rs->sr_ctrls[1] = NULL;
1720                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1721                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1722         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1723                 struct berval cookie;
1724
1725                 slap_compose_sync_cookie( op, &cookie,
1726                         &op->ors_filter->f_and->f_ava->aa_value,
1727                         srs->sr_state.rid );
1728
1729                 /* Is this a regular refresh? */
1730                 if ( !ss->ss_so ) {
1731                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1732                                 op->o_tmpmemctx );
1733                         rs->sr_ctrls[1] = NULL;
1734                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1735                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1736                                         LDAP_SYNC_REFRESH_DELETES );
1737                 } else {
1738                         int locked = 0;
1739                 /* It's RefreshAndPersist, transition to Persist phase */
1740                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1741                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1742                                 &cookie, 1, NULL, 0 );
1743                         /* Flush any queued persist messages */
1744                         if ( ss->ss_so->s_res ) {
1745                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1746                                 locked = 1;
1747                                 syncprov_qplay( op, on, ss->ss_so );
1748                         }
1749
1750                         /* Turn off the refreshing flag */
1751                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1752                         if ( locked )
1753                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1754
1755                         /* Detach this Op from frontend control */
1756                         syncprov_detach_op( op, ss->ss_so );
1757
1758                         return LDAP_SUCCESS;
1759                 }
1760         }
1761
1762         return SLAP_CB_CONTINUE;
1763 }
1764
1765 static int
1766 syncprov_op_search( Operation *op, SlapReply *rs )
1767 {
1768         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1769         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1770         slap_callback   *cb;
1771         int gotstate = 0, nochange = 0, do_present = 1;
1772         Filter *fand, *fava;
1773         syncops *sop = NULL;
1774         searchstate *ss;
1775         sync_control *srs;
1776         struct berval ctxcsn;
1777         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1778
1779         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1780
1781         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1782                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1783                 return rs->sr_err;
1784         }
1785
1786         srs = op->o_controls[slap_cids.sc_LDAPsync];
1787         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1788
1789         /* If this is a persistent search, set it up right away */
1790         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1791                 syncops so = {0};
1792                 fbase_cookie fc;
1793                 opcookie opc;
1794                 slap_callback sc;
1795
1796                 fc.fss = &so;
1797                 fc.fbase = 0;
1798                 so.s_eid = NOID;
1799                 so.s_op = op;
1800                 so.s_flags = PS_IS_REFRESHING;
1801                 /* syncprov_findbase expects to be called as a callback... */
1802                 sc.sc_private = &opc;
1803                 opc.son = on;
1804                 cb = op->o_callback;
1805                 op->o_callback = &sc;
1806                 rs->sr_err = syncprov_findbase( op, &fc );
1807                 op->o_callback = cb;
1808
1809                 if ( rs->sr_err != LDAP_SUCCESS ) {
1810                         send_ldap_result( op, rs );
1811                         return rs->sr_err;
1812                 }
1813                 sop = ch_malloc( sizeof( syncops ));
1814                 *sop = so;
1815                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1816                 sop->s_rid = srs->sr_state.rid;
1817                 sop->s_inuse = 1;
1818
1819                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1820                 sop->s_next = si->si_ops;
1821                 si->si_ops = sop;
1822                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1823         }
1824
1825         /* snapshot the ctxcsn */
1826         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1827         strcpy( csnbuf, si->si_ctxcsnbuf );
1828         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1829         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1830         ctxcsn.bv_val = csnbuf;
1831
1832         /* If we have a cookie, handle the PRESENT lookups */
1833         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1834                 sessionlog *sl;
1835
1836                 /* The cookie was validated when it was parsed, just use it */
1837
1838                 /* If just Refreshing and nothing has changed, shortcut it */
1839                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1840                         nochange = 1;
1841                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1842                                 LDAPControl     *ctrls[2];
1843
1844                                 ctrls[0] = NULL;
1845                                 ctrls[1] = NULL;
1846                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1847                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1848                                 rs->sr_ctrls = ctrls;
1849                                 rs->sr_err = LDAP_SUCCESS;
1850                                 send_ldap_result( op, rs );
1851                                 rs->sr_ctrls = NULL;
1852                                 return rs->sr_err;
1853                         }
1854                         goto shortcut;
1855                 }
1856                 /* Do we have a sessionlog for this search? */
1857                 sl=si->si_logs;
1858                 if ( sl ) {
1859                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1860                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1861                                 do_present = 0;
1862                                 /* mutex is unlocked in playlog */
1863                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1864                         } else {
1865                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1866                         }
1867                 }
1868                 /* Is the CSN still present in the database? */
1869                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1870                         /* No, so a reload is required */
1871 #if 0           /* the consumer doesn't seem to send this hint */
1872                         if ( op->o_sync_rhint == 0 ) {
1873                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1874                                 return rs->sr_err;
1875                         }
1876 #endif
1877                 } else {
1878                         gotstate = 1;
1879                         /* If changed and doing Present lookup, send Present UUIDs */
1880                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1881                                 LDAP_SUCCESS ) {
1882                                 send_ldap_result( op, rs );
1883                                 return rs->sr_err;
1884                         }
1885                 }
1886         }
1887
1888 shortcut:
1889         /* Append CSN range to search filter, save original filter
1890          * for persistent search evaluation
1891          */
1892         if ( sop ) {
1893                 sop->s_filterstr= op->ors_filterstr;
1894         }
1895
1896         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1897         fand->f_choice = LDAP_FILTER_AND;
1898         fand->f_next = NULL;
1899         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1900         fava->f_choice = LDAP_FILTER_LE;
1901         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1902         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1903 #ifdef LDAP_COMP_MATCH
1904         fava->f_ava->aa_cf = NULL;
1905 #endif
1906         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1907         fand->f_and = fava;
1908         if ( gotstate ) {
1909                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1910                 fava = fava->f_next;
1911                 fava->f_choice = LDAP_FILTER_GE;
1912                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1913                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1914 #ifdef LDAP_COMP_MATCH
1915                 fava->f_ava->aa_cf = NULL;
1916 #endif
1917                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1918         }
1919         fava->f_next = op->ors_filter;
1920         op->ors_filter = fand;
1921         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1922
1923         /* Let our callback add needed info to returned entries */
1924         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1925         ss = (searchstate *)(cb+1);
1926         ss->ss_on = on;
1927         ss->ss_so = sop;
1928         ss->ss_present = do_present;
1929         cb->sc_response = syncprov_search_response;
1930         cb->sc_cleanup = syncprov_search_cleanup;
1931         cb->sc_private = ss;
1932         cb->sc_next = op->o_callback;
1933         op->o_callback = cb;
1934
1935 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1936         op->o_sync_mode &= SLAP_CONTROL_MASK;
1937 #endif
1938
1939         /* If this is a persistent search and no changes were reported during
1940          * the refresh phase, just invoke the response callback to transition
1941          * us into persist phase
1942          */
1943         if ( nochange ) {
1944                 rs->sr_err = LDAP_SUCCESS;
1945                 rs->sr_nentries = 0;
1946                 send_ldap_result( op, rs );
1947                 return rs->sr_err;
1948         }
1949         return SLAP_CB_CONTINUE;
1950 }
1951
1952 static int
1953 syncprov_operational(
1954         Operation *op,
1955         SlapReply *rs )
1956 {
1957         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1958         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1959
1960         if ( rs->sr_entry &&
1961                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1962
1963                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1964                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1965                         Attribute *a, **ap = NULL;
1966
1967                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1968                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1969                                         break;
1970                         }
1971
1972                         if ( !a ) {
1973                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1974
1975                                 a = ch_malloc( sizeof(Attribute));
1976                                 a->a_desc = slap_schema.si_ad_contextCSN;
1977                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1978                                 a->a_vals[1].bv_val = NULL;
1979                                 a->a_nvals = a->a_vals;
1980                                 a->a_next = NULL;
1981                                 a->a_flags = 0;
1982                                 *ap = a;
1983                         }
1984
1985                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1986                         if ( !ap ) {
1987                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1988                         } else {
1989                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1990                         }
1991                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1992                 }
1993         }
1994         return SLAP_CB_CONTINUE;
1995 }
1996
1997 static int
1998 syncprov_db_config(
1999         BackendDB       *be,
2000         const char      *fname,
2001         int             lineno,
2002         int             argc,
2003         char    **argv
2004 )
2005 {
2006         slap_overinst           *on = (slap_overinst *)be->bd_info;
2007         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2008
2009         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
2010                 if ( argc != 3 ) {
2011                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
2012                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
2013                         return -1;
2014                 }
2015                 si->si_chkops = atoi( argv[1] );
2016                 si->si_chktime = atoi( argv[2] ) * 60;
2017                 return 0;
2018
2019         } else if ( strcasecmp( argv[0], "syncprov-sessionlog" ) == 0 ) {
2020                 sessionlog *sl;
2021                 int size;
2022                 if ( argc != 2 ) {
2023                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
2024                                 "\"syncprov-sessionlog <size>\"\n", fname, lineno );
2025                         return -1;
2026                 }
2027                 size = atoi( argv[1] );
2028                 if ( size < 0 ) {
2029                         fprintf( stderr,
2030                                 "%s: line %d: session log size %d is negative\n",
2031                                 fname, lineno, size );
2032                         return -1;
2033                 }
2034                 sl = si->si_logs;
2035                 if ( !sl ) {
2036                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2037                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2038                         sl->sl_mincsn.bv_len = 0;
2039                         sl->sl_num = 0;
2040                         sl->sl_head = sl->sl_tail = NULL;
2041                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2042                         si->si_logs = sl;
2043                 }
2044                 sl->sl_size = size;
2045                 return 0;
2046         }
2047
2048         return SLAP_CONF_UNKNOWN;
2049 }
2050
2051 /* Cheating - we have no thread pool context for these functions,
2052  * so make one.
2053  */
2054 typedef struct thread_keys {
2055         void *key;
2056         void *data;
2057         ldap_pvt_thread_pool_keyfree_t *xfree;
2058 } thread_keys;
2059
2060 #define MAXKEYS 32
2061 /* A fake thread context */
2062 static thread_keys thrctx[MAXKEYS];
2063
2064 /* Read any existing contextCSN from the underlying db.
2065  * Then search for any entries newer than that. If no value exists,
2066  * just generate it. Cache whatever result.
2067  */
2068 static int
2069 syncprov_db_open(
2070     BackendDB *be
2071 )
2072 {
2073         slap_overinst   *on = (slap_overinst *) be->bd_info;
2074         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2075
2076         Connection conn;
2077         char opbuf[OPERATION_BUFFER_SIZE];
2078         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2079         Operation *op = (Operation *)opbuf;
2080         Entry *e;
2081         Attribute *a;
2082         int rc;
2083
2084         if ( slapMode & SLAP_TOOL_MODE ) {
2085                 return 0;
2086         }
2087
2088         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2089         if ( rc ) {
2090                 return rc;
2091         }
2092
2093         connection_fake_init( &conn, op, thrctx );
2094         op->o_bd = be;
2095         op->o_dn = be->be_rootdn;
2096         op->o_ndn = be->be_rootndn;
2097
2098         ctxcsnbuf[0] = '\0';
2099
2100         op->o_bd->bd_info = on->on_info->oi_orig;
2101         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2102                 slap_schema.si_ad_contextCSN, 0, &e );
2103
2104         if ( e ) {
2105                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2106                 if ( a ) {
2107                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2108                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2109                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2110                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2111                                 si->si_ctxcsn.bv_len );
2112                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2113                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2114                 }
2115                 be_entry_release_rw( op, e, 0 );
2116                 op->o_bd->bd_info = (BackendInfo *)on;
2117                 op->o_req_dn = be->be_suffix[0];
2118                 op->o_req_ndn = be->be_nsuffix[0];
2119                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2120                 syncprov_findcsn( op, FIND_MAXCSN );
2121         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2122                 /* If we're also a consumer, and we didn't find the context entry,
2123                  * then don't generate anything, wait for our provider to send it
2124                  * to us.
2125                  */
2126                 goto out;
2127         }
2128
2129         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2130                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2131                                 &si->si_ctxcsn, 0 );
2132         }
2133
2134         /* If our ctxcsn is different from what was read from the root
2135          * entry, write the new value out.
2136          */
2137         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2138                 SlapReply rs = {REP_RESULT};
2139                 syncprov_checkpoint( op, &rs, on );
2140         }
2141
2142 out:
2143         op->o_bd->bd_info = (BackendInfo *)on;
2144         return 0;
2145 }
2146
2147 /* Write the current contextCSN into the underlying db.
2148  */
2149 static int
2150 syncprov_db_close(
2151     BackendDB *be
2152 )
2153 {
2154     slap_overinst   *on = (slap_overinst *) be->bd_info;
2155     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2156         int i;
2157
2158         if ( slapMode & SLAP_TOOL_MODE ) {
2159                 return 0;
2160         }
2161         if ( si->si_numops ) {
2162                 Connection conn;
2163                 char opbuf[OPERATION_BUFFER_SIZE];
2164                 Operation *op = (Operation *)opbuf;
2165                 SlapReply rs = {REP_RESULT};
2166
2167                 connection_fake_init( &conn, op, thrctx );
2168                 op->o_bd = be;
2169                 op->o_dn = be->be_rootdn;
2170                 op->o_ndn = be->be_rootndn;
2171                 syncprov_checkpoint( op, &rs, on );
2172         }
2173         for ( i=0; thrctx[i].key; i++) {
2174                 if ( thrctx[i].xfree )
2175                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2176                 thrctx[i].key = NULL;
2177         }
2178
2179     return 0;
2180 }
2181
2182 static int
2183 syncprov_db_init(
2184         BackendDB *be
2185 )
2186 {
2187         slap_overinst   *on = (slap_overinst *)be->bd_info;
2188         syncprov_info_t *si;
2189
2190         si = ch_calloc(1, sizeof(syncprov_info_t));
2191         on->on_bi.bi_private = si;
2192         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2193         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2194         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2195         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2196
2197         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2198         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2199
2200         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2201         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2202
2203         return 0;
2204 }
2205
2206 static int
2207 syncprov_db_destroy(
2208         BackendDB *be
2209 )
2210 {
2211         slap_overinst   *on = (slap_overinst *)be->bd_info;
2212         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2213
2214         if ( si ) {
2215                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2216                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2217                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2218                 ch_free( si );
2219         }
2220
2221         return 0;
2222 }
2223
2224 static int syncprov_parseCtrl (
2225         Operation *op,
2226         SlapReply *rs,
2227         LDAPControl *ctrl )
2228 {
2229         ber_tag_t tag;
2230         BerElement *ber;
2231         ber_int_t mode;
2232         ber_len_t len;
2233         struct berval cookie = BER_BVNULL;
2234         sync_control *sr;
2235         int rhint = 0;
2236
2237         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2238                 rs->sr_text = "Sync control specified multiple times";
2239                 return LDAP_PROTOCOL_ERROR;
2240         }
2241
2242         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2243                 rs->sr_text = "Sync control specified with pagedResults control";
2244                 return LDAP_PROTOCOL_ERROR;
2245         }
2246
2247         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2248                 rs->sr_text = "Sync control value is empty (or absent)";
2249                 return LDAP_PROTOCOL_ERROR;
2250         }
2251
2252         /* Parse the control value
2253          *      syncRequestValue ::= SEQUENCE {
2254          *              mode   ENUMERATED {
2255          *                      -- 0 unused
2256          *                      refreshOnly             (1),
2257          *                      -- 2 reserved
2258          *                      refreshAndPersist       (3)
2259          *              },
2260          *              cookie  syncCookie OPTIONAL
2261          *      }
2262          */
2263
2264         ber = ber_init( &ctrl->ldctl_value );
2265         if( ber == NULL ) {
2266                 rs->sr_text = "internal error";
2267                 return LDAP_OTHER;
2268         }
2269
2270         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2271                 rs->sr_text = "Sync control : mode decoding error";
2272                 return LDAP_PROTOCOL_ERROR;
2273         }
2274
2275         switch( mode ) {
2276         case LDAP_SYNC_REFRESH_ONLY:
2277                 mode = SLAP_SYNC_REFRESH;
2278                 break;
2279         case LDAP_SYNC_REFRESH_AND_PERSIST:
2280                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2281                 break;
2282         default:
2283                 rs->sr_text = "Sync control : unknown update mode";
2284                 return LDAP_PROTOCOL_ERROR;
2285         }
2286
2287         tag = ber_peek_tag( ber, &len );
2288
2289         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2290                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
2291                         rs->sr_text = "Sync control : cookie decoding error";
2292                         return LDAP_PROTOCOL_ERROR;
2293                 }
2294         }
2295         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2296                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2297                         rs->sr_text = "Sync control : rhint decoding error";
2298                         return LDAP_PROTOCOL_ERROR;
2299                 }
2300         }
2301         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2302                         rs->sr_text = "Sync control : decoding error";
2303                         return LDAP_PROTOCOL_ERROR;
2304         }
2305         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2306         sr->sr_rhint = rhint;
2307         if (!BER_BVISNULL(&cookie)) {
2308                 ber_dupbv( &sr->sr_state.octet_str, &cookie );
2309                 slap_parse_sync_cookie( &sr->sr_state );
2310         }
2311
2312         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2313
2314         (void) ber_free( ber, 1 );
2315
2316         op->o_sync = ctrl->ldctl_iscritical
2317                 ? SLAP_CONTROL_CRITICAL
2318                 : SLAP_CONTROL_NONCRITICAL;
2319
2320         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2321
2322         return LDAP_SUCCESS;
2323 }
2324
2325 /* This overlay is set up for dynamic loading via moduleload. For static
2326  * configuration, you'll need to arrange for the slap_overinst to be
2327  * initialized and registered by some other function inside slapd.
2328  */
2329
2330 static slap_overinst            syncprov;
2331
2332 int
2333 syncprov_init()
2334 {
2335         int rc;
2336
2337         rc = register_supported_control( LDAP_CONTROL_SYNC,
2338                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2339                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2340         if ( rc != LDAP_SUCCESS ) {
2341                 fprintf( stderr, "Failed to register control %d\n", rc );
2342                 return rc;
2343         }
2344
2345         syncprov.on_bi.bi_type = "syncprov";
2346         syncprov.on_bi.bi_db_init = syncprov_db_init;
2347         syncprov.on_bi.bi_db_config = syncprov_db_config;
2348         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2349         syncprov.on_bi.bi_db_open = syncprov_db_open;
2350         syncprov.on_bi.bi_db_close = syncprov_db_close;
2351
2352         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2353         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2354
2355         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2356         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2357         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2358         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2359         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2360         syncprov.on_bi.bi_op_search = syncprov_op_search;
2361         syncprov.on_bi.bi_extended = syncprov_op_extended;
2362         syncprov.on_bi.bi_operational = syncprov_operational;
2363
2364         return overlay_register( &syncprov );
2365 }
2366
2367 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2368 int
2369 init_module( int argc, char *argv[] )
2370 {
2371         return syncprov_init();
2372 }
2373 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2374
2375 #endif /* defined(SLAPD_OVER_SYNCPROV) */