git.sur5r.net Git - openldap/blob - servers/slapd/overlays/syncprov.c

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29
  30 /* A modify request on a particular entry */
  31 typedef struct modinst {
  32         struct modinst *mi_next;
  33         Operation *mi_op;
  34 } modinst;
  35
  36 typedef struct modtarget {
  37         struct modinst *mt_mods;
  38         struct modinst *mt_tail;
  39         Operation *mt_op;
  40         ldap_pvt_thread_mutex_t mt_mutex;
  41 } modtarget;
  42
  43 /* A queued result of a persistent search */
  44 typedef struct syncres {
  45         struct syncres *s_next;
  46         struct berval s_dn;
  47         struct berval s_ndn;
  48         struct berval s_uuid;
  49         struct berval s_csn;
  50         char s_mode;
  51         char s_isreference;
  52 } syncres;
  53
  54 /* Record of a persistent search */
  55 typedef struct syncops {
  56         struct syncops *s_next;
  57         struct berval   s_base;         /* ndn of search base */
  58         ID              s_eid;          /* entryID of search base */
  59         Operation       *s_op;          /* search op */
  60         int             s_rid;
  61         struct berval s_filterstr;
  62         int             s_flags;        /* search status */
  63         int             s_inuse;        /* reference count */
  64         struct syncres *s_res;
  65         struct syncres *s_restail;
  66         ldap_pvt_thread_mutex_t s_mutex;
  67 } syncops;
  68
  69 /* A received sync control */
  70 typedef struct sync_control {
  71         struct sync_cookie sr_state;
  72         int sr_rhint;
  73 } sync_control;
  74
  75 #if 0 /* moved back to slap.h */
  76 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  77 #endif
  78 /* o_sync_mode uses data bits of o_sync */
  79 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  80
  81 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  84 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  85
  86 #define PS_IS_REFRESHING        0x01
  87 #define PS_IS_DETACHED          0x02
  88
  89 /* Record of which searches matched at premodify step */
  90 typedef struct syncmatches {
  91         struct syncmatches *sm_next;
  92         syncops *sm_op;
  93 } syncmatches;
  94
  95 /* Session log data */
  96 typedef struct slog_entry {
  97         struct slog_entry *se_next;
  98         struct berval se_uuid;
  99         struct berval se_csn;
 100         ber_tag_t       se_tag;
 101 } slog_entry;
 102
 103 typedef struct sessionlog {
 104         struct berval   sl_mincsn;
 105         int             sl_num;
 106         int             sl_size;
 107         slog_entry *sl_head;
 108         slog_entry *sl_tail;
 109         ldap_pvt_thread_mutex_t sl_mutex;
 110 } sessionlog;
 111
 112 /* The main state for this overlay */
 113 typedef struct syncprov_info_t {
 114         syncops         *si_ops;
 115         struct berval   si_ctxcsn;      /* ldapsync context */
 116         int             si_chkops;      /* checkpointing info */
 117         int             si_chktime;
 118         int             si_numops;      /* number of ops since last checkpoint */
 119         time_t  si_chklast;     /* time of last checkpoint */
 120         Avlnode *si_mods;       /* entries being modified */
 121         sessionlog      *si_logs;
 122         ldap_pvt_thread_mutex_t si_csn_mutex;
 123         ldap_pvt_thread_mutex_t si_ops_mutex;
 124         ldap_pvt_thread_mutex_t si_mods_mutex;
 125         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 126 } syncprov_info_t;
 127
 128 typedef struct opcookie {
 129         slap_overinst *son;
 130         syncmatches *smatches;
 131         struct berval sdn;      /* DN of entry, for deletes */
 132         struct berval sndn;
 133         struct berval suuid;    /* UUID of entry */
 134         struct berval sctxcsn;
 135         int sreference; /* Is the entry a reference? */
 136 } opcookie;
 137
 138 typedef struct fbase_cookie {
 139         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 140         syncops *fss;   /* persistent search we're testing against */
 141         int fbase;      /* if TRUE we found the search base and it's still valid */
 142         int fscope;     /* if TRUE then fdn is within the psearch scope */
 143 } fbase_cookie;
 144
 145 static AttributeName csn_anlist[2];
 146 static AttributeName uuid_anlist[2];
 147
 148 /* Build a LDAPsync intermediate state control */
 149 static int
 150 syncprov_state_ctrl(
 151         Operation       *op,
 152         SlapReply       *rs,
 153         Entry           *e,
 154         int             entry_sync_state,
 155         LDAPControl     **ctrls,
 156         int             num_ctrls,
 157         int             send_cookie,
 158         struct berval   *cookie )
 159 {
 160         Attribute* a;
 161         int ret;
 162         int res;
 163         const char *text = NULL;
 164
 165         BerElementBuffer berbuf;
 166         BerElement *ber = (BerElement *)&berbuf;
 167
 168         struct berval   entryuuid_bv = BER_BVNULL;
 169
 170         ber_init2( ber, 0, LBER_USE_DER );
 171         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 172
 173         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 174
 175         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 176                 AttributeDescription *desc = a->a_desc;
 177                 if ( desc == slap_schema.si_ad_entryUUID ) {
 178                         entryuuid_bv = a->a_nvals[0];
 179                         break;
 180                 }
 181         }
 182
 183         if ( send_cookie && cookie ) {
 184                 ber_printf( ber, "{eOON}",
 185                         entry_sync_state, &entryuuid_bv, cookie );
 186         } else {
 187                 ber_printf( ber, "{eON}",
 188                         entry_sync_state, &entryuuid_bv );
 189         }
 190
 191         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 192         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 193         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 194
 195         ber_free_buf( ber );
 196
 197         if ( ret < 0 ) {
 198                 Debug( LDAP_DEBUG_TRACE,
 199                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 200                         0, 0, 0 );
 201                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 202                 return ret;
 203         }
 204
 205         return LDAP_SUCCESS;
 206 }
 207
 208 /* Build a LDAPsync final state control */
 209 static int
 210 syncprov_done_ctrl(
 211         Operation       *op,
 212         SlapReply       *rs,
 213         LDAPControl     **ctrls,
 214         int                     num_ctrls,
 215         int                     send_cookie,
 216         struct berval *cookie,
 217         int                     refreshDeletes )
 218 {
 219         int ret;
 220         BerElementBuffer berbuf;
 221         BerElement *ber = (BerElement *)&berbuf;
 222
 223         ber_init2( ber, NULL, LBER_USE_DER );
 224         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 225
 226         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 227
 228         ber_printf( ber, "{" );
 229         if ( send_cookie && cookie ) {
 230                 ber_printf( ber, "O", cookie );
 231         }
 232         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 233                 ber_printf( ber, "b", refreshDeletes );
 234         }
 235         ber_printf( ber, "N}" );
 236
 237         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 238         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 239         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 240
 241         ber_free_buf( ber );
 242
 243         if ( ret < 0 ) {
 244                 Debug( LDAP_DEBUG_TRACE,
 245                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 246                         0, 0, 0 );
 247                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 248                 return ret;
 249         }
 250
 251         return LDAP_SUCCESS;
 252 }
 253
 254 static int
 255 syncprov_sendinfo(
 256         Operation       *op,
 257         SlapReply       *rs,
 258         int                     type,
 259         struct berval *cookie,
 260         int                     refreshDone,
 261         BerVarray       syncUUIDs,
 262         int                     refreshDeletes )
 263 {
 264         BerElementBuffer berbuf;
 265         BerElement *ber = (BerElement *)&berbuf;
 266         struct berval rspdata;
 267
 268         int ret;
 269
 270         ber_init2( ber, NULL, LBER_USE_DER );
 271         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 272
 273         if ( type ) {
 274                 switch ( type ) {
 275                 case LDAP_TAG_SYNC_NEW_COOKIE:
 276                         ber_printf( ber, "tO", type, cookie );
 277                         break;
 278                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 279                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 280                         ber_printf( ber, "t{", type );
 281                         if ( cookie ) {
 282                                 ber_printf( ber, "O", cookie );
 283                         }
 284                         if ( refreshDone == 0 ) {
 285                                 ber_printf( ber, "b", refreshDone );
 286                         }
 287                         ber_printf( ber, "N}" );
 288                         break;
 289                 case LDAP_TAG_SYNC_ID_SET:
 290                         ber_printf( ber, "t{", type );
 291                         if ( cookie ) {
 292                                 ber_printf( ber, "O", cookie );
 293                         }
 294                         if ( refreshDeletes == 1 ) {
 295                                 ber_printf( ber, "b", refreshDeletes );
 296                         }
 297                         ber_printf( ber, "[W]", syncUUIDs );
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 default:
 301                         Debug( LDAP_DEBUG_TRACE,
 302                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 303                                 type, 0, 0 );
 304                         return LDAP_OTHER;
 305                 }
 306         }
 307
 308         ret = ber_flatten2( ber, &rspdata, 0 );
 309
 310         if ( ret < 0 ) {
 311                 Debug( LDAP_DEBUG_TRACE,
 312                         "syncprov_sendinfo: ber_flatten2 failed\n",
 313                         0, 0, 0 );
 314                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 315                 return ret;
 316         }
 317
 318         rs->sr_rspoid = LDAP_SYNC_INFO;
 319         rs->sr_rspdata = &rspdata;
 320         send_ldap_intermediate( op, rs );
 321         rs->sr_rspdata = NULL;
 322         ber_free_buf( ber );
 323
 324         return LDAP_SUCCESS;
 325 }
 326
 327 /* Find a modtarget in an AVL tree */
 328 static int
 329 sp_avl_cmp( const void *c1, const void *c2 )
 330 {
 331         const modtarget *m1, *m2;
 332         int rc;
 333
 334         m1 = c1; m2 = c2;
 335         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 336
 337         if ( rc ) return rc;
 338         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 339 }
 340
 341 /* syncprov_findbase:
 342  *   finds the true DN of the base of a search (with alias dereferencing) and
 343  * checks to make sure the base entry doesn't get replaced with a different
 344  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 345  * change is detected, any persistent search on this base must be terminated /
 346  * reloaded.
 347  *   On the first call, we just save the DN and entryID. On subsequent calls
 348  * we compare the DN and entryID with the saved values.
 349  */
 350 static int
 351 findbase_cb( Operation *op, SlapReply *rs )
 352 {
 353         slap_callback *sc = op->o_callback;
 354
 355         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 356                 fbase_cookie *fc = sc->sc_private;
 357
 358                 /* If no entryID, we're looking for the first time.
 359                  * Just store whatever we got.
 360                  */
 361                 if ( fc->fss->s_eid == NOID ) {
 362                         fc->fbase = 1;
 363                         fc->fss->s_eid = rs->sr_entry->e_id;
 364                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 365
 366                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 367                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 368
 369                 /* OK, the DN is the same and the entryID is the same. Now
 370                  * see if the fdn resides in the scope.
 371                  */
 372                         fc->fbase = 1;
 373                         switch ( fc->fss->s_op->ors_scope ) {
 374                         case LDAP_SCOPE_BASE:
 375                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 376                                 break;
 377                         case LDAP_SCOPE_ONELEVEL: {
 378                                 struct berval pdn;
 379                                 dnParent( fc->fdn, &pdn );
 380                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 381                                 break; }
 382                         case LDAP_SCOPE_SUBTREE:
 383                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 384                                 break;
 385 #ifdef LDAP_SCOPE_SUBORDINATE
 386                         case LDAP_SCOPE_SUBORDINATE:
 387                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 388                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 389                                 break;
 390 #endif
 391                         }
 392                 }
 393         }
 394         if ( rs->sr_err != LDAP_SUCCESS ) {
 395                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 396         }
 397         return LDAP_SUCCESS;
 398 }
 399
 400 static int
 401 syncprov_findbase( Operation *op, fbase_cookie *fc )
 402 {
 403         opcookie *opc = op->o_callback->sc_private;
 404         slap_overinst *on = opc->son;
 405         syncprov_info_t         *si = on->on_bi.bi_private;
 406
 407         slap_callback cb = {0};
 408         Operation fop;
 409         SlapReply frs = { REP_RESULT };
 410         int rc;
 411
 412         fop = *op;
 413
 414         cb.sc_response = findbase_cb;
 415         cb.sc_private = fc;
 416
 417         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 418         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 419         fop.o_callback = &cb;
 420         fop.o_tag = LDAP_REQ_SEARCH;
 421         fop.ors_scope = LDAP_SCOPE_BASE;
 422         fop.ors_deref = fc->fss->s_op->ors_deref;
 423         fop.ors_limit = NULL;
 424         fop.ors_slimit = 1;
 425         fop.ors_tlimit = SLAP_NO_LIMIT;
 426         fop.ors_attrs = slap_anlist_no_attrs;
 427         fop.ors_attrsonly = 1;
 428         fop.ors_filter = fc->fss->s_op->ors_filter;
 429         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 430
 431         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 432
 433         fop.o_bd->bd_info = on->on_info->oi_orig;
 434         rc = fop.o_bd->be_search( &fop, &frs );
 435         fop.o_bd->bd_info = (BackendInfo *)on;
 436
 437         if ( fc->fbase ) return LDAP_SUCCESS;
 438
 439         /* If entryID has changed, then the base of this search has
 440          * changed. Invalidate the psearch.
 441          */
 442         return LDAP_NO_SUCH_OBJECT;
 443 }
 444
 445 /* syncprov_findcsn:
 446  *   This function has three different purposes, but they all use a search
 447  * that filters on entryCSN so they're combined here.
 448  * 1: at startup time, after a contextCSN has been read from the database,
 449  * we search for all entries with CSN >= contextCSN in case the contextCSN
 450  * was not checkpointed at the previous shutdown.
 451  *
 452  * 2: when the current contextCSN is known and we have a sync cookie, we search
 453  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 454  * entry is found, the cookie CSN is valid, otherwise it is stale.
 455  *
 456  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 457  * CSN, and generate Present records for them. We always collect this result
 458  * in SyncID sets, even if there's only one match.
 459  */
 460 #define FIND_MAXCSN     1
 461 #define FIND_CSN        2
 462 #define FIND_PRESENT    3
 463
 464 static int
 465 findmax_cb( Operation *op, SlapReply *rs )
 466 {
 467         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 468                 struct berval *maxcsn = op->o_callback->sc_private;
 469                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 470                         slap_schema.si_ad_entryCSN );
 471
 472                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 473                         maxcsn->bv_len = a->a_vals[0].bv_len;
 474                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 475                 }
 476         }
 477         return LDAP_SUCCESS;
 478 }
 479
 480 static int
 481 findcsn_cb( Operation *op, SlapReply *rs )
 482 {
 483         slap_callback *sc = op->o_callback;
 484
 485         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 486                 sc->sc_private = (void *)1;
 487         }
 488         return LDAP_SUCCESS;
 489 }
 490
 491 /* Build a list of entryUUIDs for sending in a SyncID set */
 492
 493 #define UUID_LEN        16
 494
 495 typedef struct fpres_cookie {
 496         int num;
 497         BerVarray uuids;
 498         char *last;
 499 } fpres_cookie;
 500
 501 static int
 502 findpres_cb( Operation *op, SlapReply *rs )
 503 {
 504         slap_callback *sc = op->o_callback;
 505         fpres_cookie *pc = sc->sc_private;
 506         Attribute *a;
 507         int ret = SLAP_CB_CONTINUE;
 508
 509         switch ( rs->sr_type ) {
 510         case REP_SEARCH:
 511                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 512                 if ( a ) {
 513                         pc->uuids[pc->num].bv_val = pc->last;
 514                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 515                                 pc->uuids[pc->num].bv_len );
 516                         pc->num++;
 517                         pc->last = pc->uuids[pc->num].bv_val;
 518                         pc->uuids[pc->num].bv_val = NULL;
 519                 }
 520                 ret = LDAP_SUCCESS;
 521                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 522                         break;
 523                 /* FALLTHRU */
 524         case REP_RESULT:
 525                 ret = rs->sr_err;
 526                 if ( pc->num ) {
 527                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 528                                 0, pc->uuids, 0 );
 529                         pc->uuids[pc->num].bv_val = pc->last;
 530                         pc->num = 0;
 531                         pc->last = pc->uuids[0].bv_val;
 532                 }
 533                 break;
 534         default:
 535                 break;
 536         }
 537         return ret;
 538 }
 539
 540 static int
 541 syncprov_findcsn( Operation *op, int mode )
 542 {
 543         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 544         syncprov_info_t         *si = on->on_bi.bi_private;
 545
 546         slap_callback cb = {0};
 547         Operation fop;
 548         SlapReply frs = { REP_RESULT };
 549         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 550         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 551         struct berval fbuf, maxcsn;
 552         Filter cf, af;
 553 #ifdef LDAP_COMP_MATCH
 554         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 555 #else
 556         AttributeAssertion eq = { NULL, BER_BVNULL };
 557 #endif
 558         int i, rc = LDAP_SUCCESS;
 559         fpres_cookie pcookie;
 560         sync_control *srs = NULL;
 561
 562         if ( mode != FIND_MAXCSN ) {
 563                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 564
 565                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 566                         return LDAP_OTHER;
 567                 }
 568         }
 569
 570         fop = *op;
 571         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 572         /* We want pure entries, not referrals */
 573         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 574
 575         fbuf.bv_val = buf;
 576         cf.f_ava = &eq;
 577         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 578         cf.f_next = NULL;
 579
 580         fop.o_callback = &cb;
 581         fop.ors_limit = NULL;
 582         fop.ors_tlimit = SLAP_NO_LIMIT;
 583         fop.ors_filter = &cf;
 584         fop.ors_filterstr = fbuf;
 585
 586         switch( mode ) {
 587         case FIND_MAXCSN:
 588                 cf.f_choice = LDAP_FILTER_GE;
 589                 cf.f_av_value = si->si_ctxcsn;
 590                 fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)",
 591                         cf.f_av_value.bv_val );
 592                 fop.ors_attrsonly = 0;
 593                 fop.ors_attrs = csn_anlist;
 594                 fop.ors_slimit = SLAP_NO_LIMIT;
 595                 cb.sc_private = &maxcsn;
 596                 cb.sc_response = findmax_cb;
 597                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 598                 maxcsn.bv_val = cbuf;
 599                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 600                 break;
 601         case FIND_CSN:
 602                 cf.f_choice = LDAP_FILTER_LE;
 603                 cf.f_av_value = srs->sr_state.ctxcsn;
 604                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 605                         cf.f_av_value.bv_val );
 606                 fop.ors_attrsonly = 1;
 607                 fop.ors_attrs = slap_anlist_no_attrs;
 608                 fop.ors_slimit = 1;
 609                 cb.sc_private = NULL;
 610                 cb.sc_response = findcsn_cb;
 611                 break;
 612         case FIND_PRESENT:
 613                 af.f_choice = LDAP_FILTER_AND;
 614                 af.f_next = NULL;
 615                 af.f_and = &cf;
 616                 cf.f_choice = LDAP_FILTER_LE;
 617                 cf.f_av_value = srs->sr_state.ctxcsn;
 618                 cf.f_next = op->ors_filter;
 619                 fop.ors_filter = &af;
 620                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 621                 fop.ors_attrsonly = 0;
 622                 fop.ors_attrs = uuid_anlist;
 623                 fop.ors_slimit = SLAP_NO_LIMIT;
 624                 cb.sc_private = &pcookie;
 625                 cb.sc_response = findpres_cb;
 626                 pcookie.num = 0;
 627
 628                 /* preallocate storage for a full set */
 629                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 630                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 631                         op->o_tmpmemctx );
 632                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 633                 pcookie.uuids[0].bv_val = pcookie.last;
 634                 pcookie.uuids[0].bv_len = UUID_LEN;
 635                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 636                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 637                         pcookie.uuids[i].bv_len = UUID_LEN;
 638                 }
 639                 break;
 640         }
 641
 642         fop.o_bd->bd_info = on->on_info->oi_orig;
 643         fop.o_bd->be_search( &fop, &frs );
 644         fop.o_bd->bd_info = (BackendInfo *)on;
 645
 646         switch( mode ) {
 647         case FIND_MAXCSN:
 648                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 649                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 650                 break;
 651         case FIND_CSN:
 652                 /* If matching CSN was not found, invalidate the context. */
 653                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 654                 break;
 655         case FIND_PRESENT:
 656                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 657                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 658                 break;
 659         }
 660
 661         return rc;
 662 }
 663
 664 /* Queue a persistent search response */
 665 static int
 666 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 667 {
 668         syncres *sr;
 669
 670         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 671                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 672         sr->s_next = NULL;
 673         sr->s_dn.bv_val = (char *)(sr + 1);
 674         sr->s_dn.bv_len = opc->sdn.bv_len;
 675         sr->s_mode = mode;
 676         sr->s_isreference = opc->sreference;
 677         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 678         sr->s_ndn.bv_len = opc->sndn.bv_len;
 679         *(sr->s_ndn.bv_val++) = '\0';
 680         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 681         sr->s_uuid.bv_len = opc->suuid.bv_len;
 682         *(sr->s_uuid.bv_val++) = '\0';
 683         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 684         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 685         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 686
 687         if ( !so->s_res ) {
 688                 so->s_res = sr;
 689         } else {
 690                 so->s_restail->s_next = sr;
 691         }
 692         so->s_restail = sr;
 693         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 694         return LDAP_SUCCESS;
 695 }
 696
 697 /* Play back queued responses */
 698 static int
 699 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue );
 700
 701 static int
 702 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 703 {
 704         syncres *sr, *srnext;
 705         Entry *e;
 706         opcookie opc;
 707         int rc;
 708
 709         opc.son = on;
 710         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 711         for (sr = so->s_res; sr; sr=srnext) {
 712                 srnext = sr->s_next;
 713                 opc.sdn = sr->s_dn;
 714                 opc.sndn = sr->s_ndn;
 715                 opc.suuid = sr->s_uuid;
 716                 opc.sctxcsn = sr->s_csn;
 717                 opc.sreference = sr->s_isreference;
 718                 e = NULL;
 719
 720                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 721                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 722                         if ( rc ) {
 723                                 ch_free( sr );
 724                                 so->s_res = srnext;
 725                                 continue;
 726                         }
 727                 }
 728                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode, 0 );
 729
 730                 if ( e ) {
 731                         be_entry_release_rw( op, e, 0 );
 732                 }
 733                 if ( rc )
 734                         break;
 735
 736                 ch_free( sr );
 737                 so->s_res = srnext;
 738         }
 739         op->o_bd->bd_info = (BackendInfo *)on;
 740         if ( !so->s_res )
 741                 so->s_restail = NULL;
 742         return rc;
 743 }
 744
 745 /* Send a persistent search response */
 746 static int
 747 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue )
 748 {
 749         slap_overinst *on = opc->son;
 750         syncprov_info_t *si = on->on_bi.bi_private;
 751
 752         SlapReply rs = { REP_SEARCH };
 753         LDAPControl *ctrls[2];
 754         struct berval cookie;
 755         Entry e_uuid = {0};
 756         Attribute a_uuid = {0};
 757         Operation sop = *so->s_op;
 758         Opheader ohdr;
 759
 760         if ( so->s_op->o_abandon )
 761                 return SLAPD_ABANDON;
 762
 763         ohdr = *sop.o_hdr;
 764         sop.o_hdr = &ohdr;
 765         sop.o_tmpmemctx = op->o_tmpmemctx;
 766         sop.o_bd = op->o_bd;
 767         sop.o_controls = op->o_controls;
 768         sop.o_private = op->o_private;
 769
 770         /* If queueing is allowed */
 771         if ( queue ) {
 772                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 773                 /* If we're still in refresh mode, must queue */
 774                 if (so->s_flags & PS_IS_REFRESHING) {
 775                         return syncprov_qresp( opc, so, mode );
 776                 }
 777                 /* If connection is free but queue is non-empty,
 778                  * try to flush the queue.
 779                  */
 780                 if ( so->s_res ) {
 781                         rs.sr_err = syncprov_qplay( &sop, on, so );
 782                 }
 783                 /* If the connection is busy, must queue */
 784                 if ( sop.o_conn->c_writewaiter || rs.sr_err == LDAP_BUSY ) {
 785                         return syncprov_qresp( opc, so, mode );
 786                 }
 787                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 788
 789                 /* If syncprov_qplay returned any other error, bail out. */
 790                 if ( rs.sr_err ) {
 791                         return rs.sr_err;
 792                 }
 793         } else {
 794                 /* Queueing not allowed and conn is busy, give up */
 795                 if ( sop.o_conn->c_writewaiter )
 796                         return LDAP_BUSY;
 797         }
 798
 799         ctrls[1] = NULL;
 800         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 801
 802         e_uuid.e_attrs = &a_uuid;
 803         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 804         a_uuid.a_nvals = &opc->suuid;
 805         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 806                 mode, ctrls, 0, 1, &cookie );
 807
 808         rs.sr_ctrls = ctrls;
 809         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 810         switch( mode ) {
 811         case LDAP_SYNC_ADD:
 812                 rs.sr_entry = *e;
 813                 if ( rs.sr_entry->e_private )
 814                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 815                 if ( opc->sreference ) {
 816                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 817                         send_search_reference( &sop, &rs );
 818                         ber_bvarray_free( rs.sr_ref );
 819                         if ( !rs.sr_entry )
 820                                 *e = NULL;
 821                         break;
 822                 }
 823                 /* fallthru */
 824         case LDAP_SYNC_MODIFY:
 825                 rs.sr_entry = *e;
 826                 if ( rs.sr_entry->e_private )
 827                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 828                 rs.sr_attrs = sop.ors_attrs;
 829                 send_search_entry( &sop, &rs );
 830                 if ( !rs.sr_entry )
 831                         *e = NULL;
 832                 break;
 833         case LDAP_SYNC_DELETE:
 834                 e_uuid.e_attrs = NULL;
 835                 e_uuid.e_name = opc->sdn;
 836                 e_uuid.e_nname = opc->sndn;
 837                 rs.sr_entry = &e_uuid;
 838                 if ( opc->sreference ) {
 839                         struct berval bv = BER_BVNULL;
 840                         rs.sr_ref = &bv;
 841                         send_search_reference( &sop, &rs );
 842                 } else {
 843                         send_search_entry( &sop, &rs );
 844                 }
 845                 break;
 846         default:
 847                 assert(0);
 848         }
 849         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 850         op->o_private = sop.o_private;
 851         rs.sr_ctrls = NULL;
 852         /* Check queue again here; if we were hanging in a send and eventually
 853          * recovered, there may be more to send now. But don't check if the
 854          * original psearch has been abandoned.
 855          */
 856         if ( so->s_op->o_abandon )
 857                 return SLAPD_ABANDON;
 858
 859         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 860                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 861                 rs.sr_err = syncprov_qplay( &sop, on, so );
 862                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 863         }
 864         return rs.sr_err;
 865 }
 866
 867 static void
 868 syncprov_free_syncop( syncops *so )
 869 {
 870         syncres *sr, *srnext;
 871         GroupAssertion *ga, *gnext;
 872
 873         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 874         so->s_inuse--;
 875         if ( so->s_inuse > 0 ) {
 876                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 877                 return;
 878         }
 879         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 880         if ( so->s_flags & PS_IS_DETACHED ) {
 881                 filter_free( so->s_op->ors_filter );
 882                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 883                         gnext = ga->ga_next;
 884                         ch_free( ga );
 885                 }
 886                 ch_free( so->s_op );
 887         }
 888         ch_free( so->s_base.bv_val );
 889         for ( sr=so->s_res; sr; sr=srnext ) {
 890                 srnext = sr->s_next;
 891                 ch_free( sr );
 892         }
 893         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 894         ch_free( so );
 895 }
 896
 897 static int
 898 syncprov_drop_psearch( syncops *so, int lock )
 899 {
 900         if ( so->s_flags & PS_IS_DETACHED ) {
 901                 if ( lock )
 902                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 903                 so->s_op->o_conn->c_n_ops_executing--;
 904                 so->s_op->o_conn->c_n_ops_completed++;
 905                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 906                         o_next );
 907                 if ( lock )
 908                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 909         }
 910         syncprov_free_syncop( so );
 911
 912         return 0;
 913 }
 914
 915 static int
 916 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 917 {
 918         slap_callback *sc = op->o_callback;
 919         op->o_callback = sc->sc_next;
 920         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 921         op->o_tmpfree( sc, op->o_tmpmemctx );
 922         return 0;
 923 }
 924
 925 static int
 926 syncprov_op_abandon( Operation *op, SlapReply *rs )
 927 {
 928         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 929         syncprov_info_t         *si = on->on_bi.bi_private;
 930         syncops *so, *soprev;
 931
 932         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 933         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 934                 soprev=so, so=so->s_next ) {
 935                 if ( so->s_op->o_connid == op->o_connid &&
 936                         so->s_op->o_msgid == op->orn_msgid ) {
 937                                 so->s_op->o_abandon = 1;
 938                                 soprev->s_next = so->s_next;
 939                                 break;
 940                 }
 941         }
 942         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 943         if ( so ) {
 944                 /* Is this really a Cancel exop? */
 945                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 946                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 947                         rs->sr_err = LDAP_CANCELLED;
 948                         send_ldap_result( so->s_op, rs );
 949                         if ( so->s_flags & PS_IS_DETACHED ) {
 950                                 slap_callback *cb;
 951                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 952                                 cb->sc_cleanup = syncprov_ab_cleanup;
 953                                 cb->sc_next = op->o_callback;
 954                                 cb->sc_private = so;
 955                                 return SLAP_CB_CONTINUE;
 956                         }
 957                 }
 958                 syncprov_drop_psearch( so, 0 );
 959         }
 960         return SLAP_CB_CONTINUE;
 961 }
 962
 963 /* Find which persistent searches are affected by this operation */
 964 static void
 965 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 966 {
 967         slap_overinst *on = opc->son;
 968         syncprov_info_t         *si = on->on_bi.bi_private;
 969
 970         fbase_cookie fc;
 971         syncops *ss, *sprev, *snext;
 972         Entry *e;
 973         Attribute *a;
 974         int rc;
 975         struct berval newdn;
 976         int freefdn = 0;
 977
 978         fc.fdn = &op->o_req_ndn;
 979         /* compute new DN */
 980         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 981                 struct berval pdn;
 982                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 983                 else dnParent( fc.fdn, &pdn );
 984                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 985                 fc.fdn = &newdn;
 986                 freefdn = 1;
 987         }
 988         if ( op->o_tag != LDAP_REQ_ADD ) {
 989                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 990                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 991                 /* If we're sending responses now, make a copy and unlock the DB */
 992                 if ( e && !saveit ) {
 993                         Entry *e2 = entry_dup( e );
 994                         be_entry_release_rw( op, e, 0 );
 995                         e = e2;
 996                 }
 997                 op->o_bd->bd_info = (BackendInfo *)on;
 998                 if ( rc ) return;
 999         } else {
1000                 e = op->ora_e;
1001         }
1002
1003         if ( saveit ) {
1004                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1005                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1006                 opc->sreference = is_entry_referral( e );
1007         }
1008         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1009                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1010                 if ( a )
1011                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1012         }
1013
1014         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1015         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1016                 sprev = ss, ss=snext)
1017         {
1018                 syncmatches *sm;
1019                 int found = 0;
1020
1021                 snext = ss->s_next;
1022                 /* validate base */
1023                 fc.fss = ss;
1024                 fc.fbase = 0;
1025                 fc.fscope = 0;
1026
1027                 /* If the base of the search is missing, signal a refresh */
1028                 rc = syncprov_findbase( op, &fc );
1029                 if ( rc != LDAP_SUCCESS ) {
1030                         SlapReply rs = {REP_RESULT};
1031                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1032                                 "search base has changed" );
1033                         sprev->s_next = snext;
1034                         syncprov_drop_psearch( ss, 1 );
1035                         continue;
1036                 }
1037
1038                 /* If we're sending results now, look for this op in old matches */
1039                 if ( !saveit ) {
1040                         syncmatches *old;
1041                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1042                                 old=sm, sm=sm->sm_next ) {
1043                                 if ( sm->sm_op == ss ) {
1044                                         found = 1;
1045                                         old->sm_next = sm->sm_next;
1046                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1047                                         break;
1048                                 }
1049                         }
1050                 }
1051
1052                 /* check if current o_req_dn is in scope and matches filter */
1053                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1054                         LDAP_COMPARE_TRUE ) {
1055                         if ( saveit ) {
1056                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1057                                 sm->sm_next = opc->smatches;
1058                                 sm->sm_op = ss;
1059                                 ss->s_inuse++;
1060                                 opc->smatches = sm;
1061                         } else {
1062                                 /* if found send UPDATE else send ADD */
1063                                 ss->s_inuse++;
1064                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1065                                 syncprov_sendresp( op, opc, ss, &e,
1066                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1067                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1068                                 ss->s_inuse--;
1069                         }
1070                 } else if ( !saveit && found ) {
1071                         /* send DELETE */
1072                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1073                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1074                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1075                 }
1076         }
1077         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1078 done:
1079         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1080                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1081                 be_entry_release_rw( op, e, 0 );
1082                 op->o_bd->bd_info = (BackendInfo *)on;
1083         }
1084         if ( freefdn ) {
1085                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1086         }
1087 }
1088
1089 static int
1090 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1091 {
1092         slap_callback *cb = op->o_callback;
1093         opcookie *opc = cb->sc_private;
1094         slap_overinst *on = opc->son;
1095         syncprov_info_t         *si = on->on_bi.bi_private;
1096         syncmatches *sm, *snext;
1097         modtarget *mt, mtdummy;
1098
1099         for (sm = opc->smatches; sm; sm=snext) {
1100                 snext = sm->sm_next;
1101                 syncprov_free_syncop( sm->sm_op );
1102                 op->o_tmpfree( sm, op->o_tmpmemctx );
1103         }
1104
1105         /* Remove op from lock table */
1106         mtdummy.mt_op = op;
1107         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1108         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1109         if ( mt ) {
1110                 modinst *mi = mt->mt_mods;
1111
1112                 /* If there are more, promote the next one */
1113                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1114                 if ( mi->mi_next ) {
1115                         mt->mt_mods = mi->mi_next;
1116                         mt->mt_op = mt->mt_mods->mi_op;
1117                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1118                 } else {
1119                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1120                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1121                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1122                         ch_free( mt );
1123                 }
1124         }
1125         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1126         if ( !BER_BVISNULL( &opc->suuid ))
1127                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1128         if ( !BER_BVISNULL( &opc->sndn ))
1129                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1130         if ( !BER_BVISNULL( &opc->sdn ))
1131                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1132         op->o_callback = cb->sc_next;
1133         op->o_tmpfree(cb, op->o_tmpmemctx);
1134
1135         return 0;
1136 }
1137
1138 static void
1139 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1140 {
1141         syncprov_info_t         *si = on->on_bi.bi_private;
1142         Modifications mod;
1143         Operation opm;
1144         struct berval bv[2];
1145         slap_callback cb = {0};
1146         int manage = get_manageDSAit(op);
1147
1148         mod.sml_values = bv;
1149         bv[1].bv_val = NULL;
1150         bv[0] = si->si_ctxcsn;
1151         mod.sml_nvalues = NULL;
1152         mod.sml_desc = slap_schema.si_ad_contextCSN;
1153         mod.sml_op = LDAP_MOD_REPLACE;
1154         mod.sml_next = NULL;
1155
1156         cb.sc_response = slap_null_cb;
1157         opm = *op;
1158         opm.o_tag = LDAP_REQ_MODIFY;
1159         opm.o_callback = &cb;
1160         opm.orm_modlist = &mod;
1161         opm.o_req_dn = op->o_bd->be_suffix[0];
1162         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1163         opm.o_bd->bd_info = on->on_info->oi_orig;
1164         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1165         opm.o_bd->be_modify( &opm, rs );
1166         opm.o_managedsait = manage;
1167 }
1168
1169 static void
1170 syncprov_add_slog( Operation *op, struct berval *csn )
1171 {
1172         opcookie *opc = op->o_callback->sc_private;
1173         slap_overinst *on = opc->son;
1174         syncprov_info_t         *si = on->on_bi.bi_private;
1175         sessionlog *sl;
1176         slog_entry *se;
1177
1178         sl = si->si_logs;
1179         {
1180                 /* Allocate a record. UUIDs are not NUL-terminated. */
1181                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1182                         csn->bv_len + 1 );
1183                 se->se_next = NULL;
1184                 se->se_tag = op->o_tag;
1185
1186                 se->se_uuid.bv_val = (char *)(se+1);
1187                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len + 1;
1188                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1189                 se->se_uuid.bv_len = opc->suuid.bv_len;
1190
1191                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1192                 se->se_csn.bv_val[csn->bv_len] = '\0';
1193                 se->se_csn.bv_len = csn->bv_len;
1194
1195                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1196                 if ( sl->sl_head ) {
1197                         sl->sl_tail->se_next = se;
1198                 } else {
1199                         sl->sl_head = se;
1200                 }
1201                 sl->sl_tail = se;
1202                 sl->sl_num++;
1203                 while ( sl->sl_num > sl->sl_size ) {
1204                         se = sl->sl_head;
1205                         sl->sl_head = se->se_next;
1206                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1207                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1208                         ch_free( se );
1209                         sl->sl_num--;
1210                         if ( !sl->sl_head ) {
1211                                 sl->sl_tail = NULL;
1212                         }
1213                 }
1214                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1215         }
1216 }
1217
1218 /* Just set a flag if we found the matching entry */
1219 static int
1220 playlog_cb( Operation *op, SlapReply *rs )
1221 {
1222         if ( rs->sr_type == REP_SEARCH ) {
1223                 op->o_callback->sc_private = (void *)1;
1224         }
1225         return rs->sr_err;
1226 }
1227
1228 /* enter with sl->sl_mutex locked, release before returning */
1229 static void
1230 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1231         struct berval *oldcsn, struct berval *ctxcsn )
1232 {
1233         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1234         syncprov_info_t         *si = on->on_bi.bi_private;
1235         slog_entry *se;
1236         int i, j, ndel, num, nmods, mmods;
1237         BerVarray uuids;
1238
1239         if ( !sl->sl_num ) {
1240                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1241                 return;
1242         }
1243
1244         num = sl->sl_num;
1245         i = 0;
1246         nmods = 0;
1247
1248         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1249                 num * UUID_LEN, op->o_tmpmemctx );
1250
1251         uuids[0].bv_val = (char *)(uuids + num + 1);
1252
1253         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1254          * and everything else at the end. Do this first so we can
1255          * unlock the list mutex.
1256          */
1257         for ( se=sl->sl_head; se; se=se->se_next ) {
1258                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1259                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1260                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1261                         j = i;
1262                         i++;
1263                 } else {
1264                         nmods++;
1265                         j = num - nmods;
1266                 }
1267                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1268                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1269                 uuids[j].bv_len = UUID_LEN;
1270         }
1271         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1272
1273         ndel = i;
1274
1275         /* Zero out unused slots */
1276         for ( i=ndel; i < num - nmods; i++ )
1277                 uuids[i].bv_len = 0;
1278
1279         /* Mods must be validated to see if they belong in this delete set.
1280          */
1281
1282         mmods = nmods;
1283         /* Strip any duplicates */
1284         for ( i=0; i<nmods; i++ ) {
1285                 for ( j=0; j<ndel; j++ ) {
1286                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1287                                 uuids[num - 1 - i].bv_len = 0;
1288                                 mmods --;
1289                                 break;
1290                         }
1291                 }
1292                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1293                 for ( j=0; j<i; j++ ) {
1294                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1295                                 uuids[num - 1 - i].bv_len = 0;
1296                                 mmods --;
1297                                 break;
1298                         }
1299                 }
1300         }
1301
1302         if ( mmods ) {
1303                 Operation fop;
1304                 SlapReply frs = { REP_RESULT };
1305                 int rc;
1306                 Filter mf, af;
1307 #ifdef LDAP_COMP_MATCH
1308                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1309 #else
1310                 AttributeAssertion eq;
1311 #endif
1312                 slap_callback cb = {0};
1313
1314                 fop = *op;
1315
1316                 fop.o_sync_mode = 0;
1317                 fop.o_callback = &cb;
1318                 fop.ors_limit = NULL;
1319                 fop.ors_tlimit = SLAP_NO_LIMIT;
1320                 fop.ors_attrs = slap_anlist_all_attributes;
1321                 fop.ors_attrsonly = 0;
1322                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1323
1324                 af.f_choice = LDAP_FILTER_AND;
1325                 af.f_next = NULL;
1326                 af.f_and = &mf;
1327                 mf.f_choice = LDAP_FILTER_EQUALITY;
1328                 mf.f_ava = &eq;
1329                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1330                 mf.f_next = fop.ors_filter;
1331
1332                 fop.ors_filter = &af;
1333
1334                 cb.sc_response = playlog_cb;
1335                 fop.o_bd->bd_info = on->on_info->oi_orig;
1336
1337                 for ( i=ndel; i<num; i++ ) {
1338                         if ( uuids[i].bv_len == 0 ) continue;
1339
1340                         mf.f_av_value = uuids[i];
1341                         cb.sc_private = NULL;
1342                         fop.ors_slimit = 1;
1343                         rc = fop.o_bd->be_search( &fop, &frs );
1344
1345                         /* If entry was not found, add to delete list */
1346                         if ( !cb.sc_private ) {
1347                                 uuids[ndel++] = uuids[i];
1348                         }
1349                 }
1350                 fop.o_bd->bd_info = (BackendInfo *)on;
1351         }
1352         if ( ndel ) {
1353                 uuids[ndel].bv_val = NULL;
1354                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1355         }
1356 }
1357
1358 static int
1359 syncprov_op_response( Operation *op, SlapReply *rs )
1360 {
1361         opcookie *opc = op->o_callback->sc_private;
1362         slap_overinst *on = opc->son;
1363         syncprov_info_t         *si = on->on_bi.bi_private;
1364         syncmatches *sm;
1365
1366         if ( rs->sr_err == LDAP_SUCCESS )
1367         {
1368                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1369                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1370
1371                 /* Update our context CSN */
1372                 cbuf[0] = '\0';
1373                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1374                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1375                 if ( !BER_BVISNULL( &maxcsn ) ) {
1376                         strcpy( cbuf, maxcsn.bv_val );
1377                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1378                                 strcpy( si->si_ctxcsnbuf, cbuf );
1379                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1380                         }
1381                 }
1382
1383                 /* Don't do any processing for consumer contextCSN updates */
1384                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1385                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1386                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1387                         return SLAP_CB_CONTINUE;
1388                 }
1389
1390                 si->si_numops++;
1391                 if ( si->si_chkops || si->si_chktime ) {
1392                         int do_check=0;
1393                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1394                                 do_check = 1;
1395                                 si->si_numops = 0;
1396                         }
1397                         if ( si->si_chktime &&
1398                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1399                                 do_check = 1;
1400                                 si->si_chklast = op->o_time;
1401                         }
1402                         if ( do_check ) {
1403                                 syncprov_checkpoint( op, rs, on );
1404                         }
1405                 }
1406                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1407
1408                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1409                 opc->sctxcsn.bv_val = cbuf;
1410
1411                 /* Handle any persistent searches */
1412                 if ( si->si_ops ) {
1413                         switch(op->o_tag) {
1414                         case LDAP_REQ_ADD:
1415                         case LDAP_REQ_MODIFY:
1416                         case LDAP_REQ_MODRDN:
1417                         case LDAP_REQ_EXTENDED:
1418                                 syncprov_matchops( op, opc, 0 );
1419                                 break;
1420                         case LDAP_REQ_DELETE:
1421                                 /* for each match in opc->smatches:
1422                                  *   send DELETE msg
1423                                  */
1424                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1425                                         if ( sm->sm_op->s_op->o_abandon )
1426                                                 continue;
1427                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1428                                                 LDAP_SYNC_DELETE, 1 );
1429                                 }
1430                                 break;
1431                         }
1432                 }
1433
1434                 /* Add any log records */
1435                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1436                         syncprov_add_slog( op, &curcsn );
1437                 }
1438
1439         }
1440         return SLAP_CB_CONTINUE;
1441 }
1442
1443 /* We don't use a subentry to store the context CSN any more.
1444  * We expose the current context CSN as an operational attribute
1445  * of the suffix entry.
1446  */
1447 static int
1448 syncprov_op_compare( Operation *op, SlapReply *rs )
1449 {
1450         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1451         syncprov_info_t         *si = on->on_bi.bi_private;
1452         int rc = SLAP_CB_CONTINUE;
1453
1454         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1455                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1456         {
1457                 Entry e = {0};
1458                 Attribute a = {0};
1459                 struct berval bv[2];
1460
1461                 e.e_name = op->o_bd->be_suffix[0];
1462                 e.e_nname = op->o_bd->be_nsuffix[0];
1463
1464                 BER_BVZERO( &bv[1] );
1465                 bv[0] = si->si_ctxcsn;
1466
1467                 a.a_desc = slap_schema.si_ad_contextCSN;
1468                 a.a_vals = bv;
1469                 a.a_nvals = a.a_vals;
1470
1471                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1472
1473                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1474                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1475                 if ( ! rs->sr_err ) {
1476                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1477                         goto return_results;
1478                 }
1479
1480                 if ( get_assert( op ) &&
1481                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1482                 {
1483                         rs->sr_err = LDAP_ASSERTION_FAILED;
1484                         goto return_results;
1485                 }
1486
1487
1488                 rs->sr_err = LDAP_COMPARE_FALSE;
1489
1490                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1491                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1492                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1493                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1494                 {
1495                         rs->sr_err = LDAP_COMPARE_TRUE;
1496                 }
1497
1498 return_results:;
1499
1500                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1501
1502                 send_ldap_result( op, rs );
1503
1504                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1505                         rs->sr_err = LDAP_SUCCESS;
1506                 }
1507                 rc = rs->sr_err;
1508         }
1509
1510         return rc;
1511 }
1512
1513 static int
1514 syncprov_op_mod( Operation *op, SlapReply *rs )
1515 {
1516         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1517         syncprov_info_t         *si = on->on_bi.bi_private;
1518
1519         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1520                 sizeof(opcookie) +
1521                 (si->si_ops ? sizeof(modinst) : 0 ),
1522                 op->o_tmpmemctx);
1523         opcookie *opc = (opcookie *)(cb+1);
1524         opc->son = on;
1525         cb->sc_response = syncprov_op_response;
1526         cb->sc_cleanup = syncprov_op_cleanup;
1527         cb->sc_private = opc;
1528         cb->sc_next = op->o_callback;
1529         op->o_callback = cb;
1530
1531         /* If there are active persistent searches, lock this operation.
1532          * See seqmod.c for the locking logic on its own.
1533          */
1534         if ( si->si_ops ) {
1535                 modtarget *mt, mtdummy;
1536                 modinst *mi;
1537
1538                 mi = (modinst *)(opc+1);
1539                 mi->mi_op = op;
1540
1541                 /* See if we're already modifying this entry... */
1542                 mtdummy.mt_op = op;
1543                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1544                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1545                 if ( mt ) {
1546                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1547                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1548                         mt->mt_tail->mi_next = mi;
1549                         mt->mt_tail = mi;
1550                         /* wait for this op to get to head of list */
1551                         while ( mt->mt_mods != mi ) {
1552                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1553                                 ldap_pvt_thread_yield();
1554                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1555
1556                                 /* clean up if the caller is giving up */
1557                                 if ( op->o_abandon ) {
1558                                         modinst *m2;
1559                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1560                                                 m2 = m2->mi_next );
1561                                         m2->mi_next = mi->mi_next;
1562                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1563                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1564                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1565                                         return SLAPD_ABANDON;
1566                                 }
1567                         }
1568                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1569                 } else {
1570                         /* Record that we're modifying this entry now */
1571                         mt = ch_malloc( sizeof(modtarget) );
1572                         mt->mt_mods = mi;
1573                         mt->mt_tail = mi;
1574                         mt->mt_op = mi->mi_op;
1575                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1576                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1577                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1578                 }
1579         }
1580
1581         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1582                 syncprov_matchops( op, opc, 1 );
1583
1584         return SLAP_CB_CONTINUE;
1585 }
1586
1587 static int
1588 syncprov_op_extended( Operation *op, SlapReply *rs )
1589 {
1590         if ( exop_is_write( op ))
1591                 return syncprov_op_mod( op, rs );
1592
1593         return SLAP_CB_CONTINUE;
1594 }
1595
1596 typedef struct searchstate {
1597         slap_overinst *ss_on;
1598         syncops *ss_so;
1599         int ss_present;
1600 } searchstate;
1601
1602 static int
1603 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1604 {
1605         if ( rs->sr_ctrls ) {
1606                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1607                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1608                 rs->sr_ctrls = NULL;
1609         }
1610         return 0;
1611 }
1612
1613 static void
1614 syncprov_detach_op( Operation *op, syncops *so )
1615 {
1616         Operation *op2;
1617         int i, alen = 0;
1618         size_t size;
1619         char *ptr;
1620         GroupAssertion *g1, *g2;
1621
1622         /* count the search attrs */
1623         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1624                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1625         }
1626         /* Make a new copy of the operation */
1627         size = sizeof(Operation) + sizeof(Opheader) +
1628                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1629                 op->o_req_dn.bv_len + 1 +
1630                 op->o_req_ndn.bv_len + 1 +
1631                 op->o_ndn.bv_len + 1 +
1632                 so->s_filterstr.bv_len + 1;
1633         op2 = (Operation *)ch_calloc( 1, size );
1634         op2->o_hdr = (Opheader *)(op2+1);
1635
1636         /* Copy the fields we care about explicitly, leave the rest alone */
1637         *op2->o_hdr = *op->o_hdr;
1638         op2->o_tag = op->o_tag;
1639         op2->o_time = op->o_time;
1640         op2->o_bd = op->o_bd;
1641         op2->o_request = op->o_request;
1642
1643         if ( i ) {
1644                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1645                 ptr = (char *)(op2->ors_attrs+i+1);
1646                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1647                         op2->ors_attrs[i] = op->ors_attrs[i];
1648                         op2->ors_attrs[i].an_name.bv_val = ptr;
1649                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1650                 }
1651                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1652         } else {
1653                 ptr = (char *)(op2->o_hdr + 1);
1654         }
1655         op2->o_authz = op->o_authz;
1656         op2->o_ndn.bv_val = ptr;
1657         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1658         op2->o_dn = op2->o_ndn;
1659         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1660         op2->o_req_dn.bv_val = ptr;
1661         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1662         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1663         op2->o_req_ndn.bv_val = ptr;
1664         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1665         op2->ors_filterstr.bv_val = ptr;
1666         strcpy( ptr, so->s_filterstr.bv_val );
1667         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1668         op2->ors_filter = str2filter( ptr );
1669         so->s_op = op2;
1670
1671         /* Copy any cached group ACLs individually */
1672         op2->o_groups = NULL;
1673         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1674                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1675                 *g2 = *g1;
1676                 strcpy( g2->ga_ndn, g1->ga_ndn );
1677                 g2->ga_next = op2->o_groups;
1678                 op2->o_groups = g2;
1679         }
1680
1681         /* Add op2 to conn so abandon will find us */
1682         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1683         op->o_conn->c_n_ops_executing++;
1684         op->o_conn->c_n_ops_completed--;
1685         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1686         so->s_flags |= PS_IS_DETACHED;
1687         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1688 }
1689
1690 static int
1691 syncprov_search_response( Operation *op, SlapReply *rs )
1692 {
1693         searchstate *ss = op->o_callback->sc_private;
1694         slap_overinst *on = ss->ss_on;
1695         syncprov_info_t         *si = on->on_bi.bi_private;
1696         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1697
1698         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1699                 int i;
1700                 /* If we got a referral without a referral object, there's
1701                  * something missing that we cannot replicate. Just ignore it.
1702                  * The consumer will abort because we didn't send the expected
1703                  * control.
1704                  */
1705                 if ( !rs->sr_entry ) {
1706                         assert( rs->sr_entry );
1707                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1708                         return SLAP_CB_CONTINUE;
1709                 }
1710                 if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1711                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1712                                 slap_schema.si_ad_entryCSN );
1713
1714                         /* Don't send the ctx entry twice */
1715                         if ( a && bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1716                                 return LDAP_SUCCESS;
1717                 }
1718                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1719                         op->o_tmpmemctx );
1720                 rs->sr_ctrls[1] = NULL;
1721                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1722                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1723         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1724                 struct berval cookie;
1725
1726                 slap_compose_sync_cookie( op, &cookie,
1727                         &op->ors_filter->f_and->f_ava->aa_value,
1728                         srs->sr_state.rid );
1729
1730                 /* Is this a regular refresh? */
1731                 if ( !ss->ss_so ) {
1732                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1733                                 op->o_tmpmemctx );
1734                         rs->sr_ctrls[1] = NULL;
1735                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1736                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1737                                         LDAP_SYNC_REFRESH_DELETES );
1738                 } else {
1739                         int locked = 0;
1740                 /* It's RefreshAndPersist, transition to Persist phase */
1741                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1742                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1743                                 &cookie, 1, NULL, 0 );
1744                         /* Flush any queued persist messages */
1745                         if ( ss->ss_so->s_res ) {
1746                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1747                                 locked = 1;
1748                                 syncprov_qplay( op, on, ss->ss_so );
1749                         }
1750
1751                         /* Turn off the refreshing flag */
1752                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1753                         if ( locked )
1754                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1755
1756                         /* Detach this Op from frontend control */
1757                         syncprov_detach_op( op, ss->ss_so );
1758
1759                         return LDAP_SUCCESS;
1760                 }
1761         }
1762
1763         return SLAP_CB_CONTINUE;
1764 }
1765
1766 static int
1767 syncprov_op_search( Operation *op, SlapReply *rs )
1768 {
1769         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1770         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1771         slap_callback   *cb;
1772         int gotstate = 0, nochange = 0, do_present = 1;
1773         Filter *fand, *fava;
1774         syncops *sop = NULL;
1775         searchstate *ss;
1776         sync_control *srs;
1777         struct berval ctxcsn;
1778         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1779
1780         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1781
1782         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1783                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1784                 return rs->sr_err;
1785         }
1786
1787         srs = op->o_controls[slap_cids.sc_LDAPsync];
1788         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1789
1790         /* If this is a persistent search, set it up right away */
1791         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1792                 syncops so = {0};
1793                 fbase_cookie fc;
1794                 opcookie opc;
1795                 slap_callback sc;
1796
1797                 fc.fss = &so;
1798                 fc.fbase = 0;
1799                 so.s_eid = NOID;
1800                 so.s_op = op;
1801                 so.s_flags = PS_IS_REFRESHING;
1802                 /* syncprov_findbase expects to be called as a callback... */
1803                 sc.sc_private = &opc;
1804                 opc.son = on;
1805                 cb = op->o_callback;
1806                 op->o_callback = &sc;
1807                 rs->sr_err = syncprov_findbase( op, &fc );
1808                 op->o_callback = cb;
1809
1810                 if ( rs->sr_err != LDAP_SUCCESS ) {
1811                         send_ldap_result( op, rs );
1812                         return rs->sr_err;
1813                 }
1814                 sop = ch_malloc( sizeof( syncops ));
1815                 *sop = so;
1816                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1817                 sop->s_rid = srs->sr_state.rid;
1818                 sop->s_inuse = 1;
1819
1820                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1821                 sop->s_next = si->si_ops;
1822                 si->si_ops = sop;
1823                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1824         }
1825
1826         /* snapshot the ctxcsn */
1827         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1828         strcpy( csnbuf, si->si_ctxcsnbuf );
1829         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1830         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1831         ctxcsn.bv_val = csnbuf;
1832
1833         /* If we have a cookie, handle the PRESENT lookups */
1834         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1835                 sessionlog *sl;
1836
1837                 /* The cookie was validated when it was parsed, just use it */
1838
1839                 /* If just Refreshing and nothing has changed, shortcut it */
1840                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1841                         nochange = 1;
1842                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1843                                 LDAPControl     *ctrls[2];
1844
1845                                 ctrls[0] = NULL;
1846                                 ctrls[1] = NULL;
1847                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1848                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1849                                 rs->sr_ctrls = ctrls;
1850                                 rs->sr_err = LDAP_SUCCESS;
1851                                 send_ldap_result( op, rs );
1852                                 rs->sr_ctrls = NULL;
1853                                 return rs->sr_err;
1854                         }
1855                         goto shortcut;
1856                 }
1857                 /* Do we have a sessionlog for this search? */
1858                 sl=si->si_logs;
1859                 if ( sl ) {
1860                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1861                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1862                                 do_present = 0;
1863                                 /* mutex is unlocked in playlog */
1864                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1865                         } else {
1866                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1867                         }
1868                 }
1869                 /* Is the CSN still present in the database? */
1870                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1871                         /* No, so a reload is required */
1872 #if 0           /* the consumer doesn't seem to send this hint */
1873                         if ( op->o_sync_rhint == 0 ) {
1874                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1875                                 return rs->sr_err;
1876                         }
1877 #endif
1878                 } else {
1879                         gotstate = 1;
1880                         /* If changed and doing Present lookup, send Present UUIDs */
1881                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1882                                 LDAP_SUCCESS ) {
1883                                 send_ldap_result( op, rs );
1884                                 return rs->sr_err;
1885                         }
1886                 }
1887         }
1888
1889 shortcut:
1890         /* Append CSN range to search filter, save original filter
1891          * for persistent search evaluation
1892          */
1893         if ( sop ) {
1894                 sop->s_filterstr= op->ors_filterstr;
1895         }
1896
1897         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1898         fand->f_choice = LDAP_FILTER_AND;
1899         fand->f_next = NULL;
1900         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1901         fava->f_choice = LDAP_FILTER_LE;
1902         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1903         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1904 #ifdef LDAP_COMP_MATCH
1905         fava->f_ava->aa_cf = NULL;
1906 #endif
1907         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1908         fand->f_and = fava;
1909         if ( gotstate ) {
1910                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1911                 fava = fava->f_next;
1912                 fava->f_choice = LDAP_FILTER_GE;
1913                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1914                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1915 #ifdef LDAP_COMP_MATCH
1916                 fava->f_ava->aa_cf = NULL;
1917 #endif
1918                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1919         }
1920         fava->f_next = op->ors_filter;
1921         op->ors_filter = fand;
1922         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1923
1924         /* Let our callback add needed info to returned entries */
1925         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1926         ss = (searchstate *)(cb+1);
1927         ss->ss_on = on;
1928         ss->ss_so = sop;
1929         ss->ss_present = do_present;
1930         cb->sc_response = syncprov_search_response;
1931         cb->sc_cleanup = syncprov_search_cleanup;
1932         cb->sc_private = ss;
1933         cb->sc_next = op->o_callback;
1934         op->o_callback = cb;
1935
1936 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1937         op->o_sync_mode &= SLAP_CONTROL_MASK;
1938 #endif
1939
1940         /* If this is a persistent search and no changes were reported during
1941          * the refresh phase, just invoke the response callback to transition
1942          * us into persist phase
1943          */
1944         if ( nochange ) {
1945                 rs->sr_err = LDAP_SUCCESS;
1946                 rs->sr_nentries = 0;
1947                 send_ldap_result( op, rs );
1948                 return rs->sr_err;
1949         }
1950         return SLAP_CB_CONTINUE;
1951 }
1952
1953 static int
1954 syncprov_operational(
1955         Operation *op,
1956         SlapReply *rs )
1957 {
1958         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1959         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1960
1961         if ( rs->sr_entry &&
1962                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1963
1964                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1965                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1966                         Attribute *a, **ap = NULL;
1967
1968                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1969                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1970                                         break;
1971                         }
1972
1973                         if ( !a ) {
1974                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1975
1976                                 a = ch_malloc( sizeof(Attribute));
1977                                 a->a_desc = slap_schema.si_ad_contextCSN;
1978                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1979                                 a->a_vals[1].bv_val = NULL;
1980                                 a->a_nvals = a->a_vals;
1981                                 a->a_next = NULL;
1982                                 a->a_flags = 0;
1983                                 *ap = a;
1984                         }
1985
1986                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1987                         if ( !ap ) {
1988                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1989                         } else {
1990                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1991                         }
1992                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1993                 }
1994         }
1995         return SLAP_CB_CONTINUE;
1996 }
1997
1998 enum {
1999         SP_CHKPT = 1,
2000         SP_SESSL
2001 };
2002
2003 static ConfigDriver sp_cf_gen;
2004
2005 static ConfigTable spcfg[] = {
2006         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2007                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2008                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2009                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2010         { "syncprov-sessionlog", "size", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2011                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2012                         "DESC 'Session log size in ops' "
2013                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2014         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2015 };
2016
2017 static ConfigOCs spocs[] = {
2018         { "( OLcfgOvOc:1.1 "
2019                 "NAME 'olcSyncProvConfig' "
2020                 "DESC 'SyncRepl Provider configuration' "
2021                 "SUP olcOverlayConfig "
2022                 "MAY ( olcSpCheckpoint $ olcSpSessionlog ) )",
2023                         Cft_Overlay, spcfg },
2024         { NULL, 0, NULL }
2025 };
2026
2027 static int
2028 sp_cf_gen(ConfigArgs *c)
2029 {
2030         slap_overinst           *on = (slap_overinst *)c->bi;
2031         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2032         int rc = 0;
2033
2034         if ( c->op == SLAP_CONFIG_EMIT ) {
2035                 switch ( c->type ) {
2036                 case SP_CHKPT:
2037                         if ( si->si_chkops || si->si_chktime ) {
2038                                 struct berval bv;
2039                                 bv.bv_len = sprintf( c->msg, "%d %d",
2040                                         si->si_chkops, si->si_chktime );
2041                                 bv.bv_val = c->msg;
2042                                 value_add_one( &c->rvalue_vals, &bv );
2043                         } else {
2044                                 rc = 1;
2045                         }
2046                         break;
2047                 case SP_SESSL:
2048                         if ( si->si_logs ) {
2049                                 c->value_int = si->si_logs->sl_size;
2050                         } else {
2051                                 rc = 1;
2052                         }
2053                         break;
2054                 }
2055                 return rc;
2056         } else if ( c->op == LDAP_MOD_DELETE ) {
2057                 switch ( c->type ) {
2058                 case SP_CHKPT:
2059                         si->si_chkops = 0;
2060                         si->si_chktime = 0;
2061                         break;
2062                 case SP_SESSL:
2063                         if ( si->si_logs )
2064                                 si->si_logs->sl_size = 0;
2065                         else
2066                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2067                         break;
2068                 }
2069                 return rc;
2070         }
2071         switch ( c->type ) {
2072         case SP_CHKPT:
2073                 si->si_chkops = atoi( c->argv[1] );
2074                 si->si_chktime = atoi( c->argv[2] ) * 60;
2075                 break;
2076         case SP_SESSL: {
2077                 sessionlog *sl;
2078                 int size = c->value_int;
2079
2080                 if ( size < 0 ) {
2081                         sprintf( c->msg, "%s size %d is negative",
2082                                 c->argv[0], size );
2083                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2084                         return ARG_BAD_CONF;
2085                 }
2086                 sl = si->si_logs;
2087                 if ( !sl ) {
2088                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2089                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2090                         sl->sl_mincsn.bv_len = 0;
2091                         sl->sl_num = 0;
2092                         sl->sl_head = sl->sl_tail = NULL;
2093                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2094                         si->si_logs = sl;
2095                 }
2096                 sl->sl_size = size;
2097                 }
2098                 break;
2099         }
2100         return rc;
2101 }
2102
2103 /* Cheating - we have no thread pool context for these functions,
2104  * so make one.
2105  */
2106 typedef struct thread_keys {
2107         void *key;
2108         void *data;
2109         ldap_pvt_thread_pool_keyfree_t *xfree;
2110 } thread_keys;
2111
2112 #define MAXKEYS 32
2113 /* A fake thread context */
2114 static thread_keys thrctx[MAXKEYS];
2115
2116 /* Read any existing contextCSN from the underlying db.
2117  * Then search for any entries newer than that. If no value exists,
2118  * just generate it. Cache whatever result.
2119  */
2120 static int
2121 syncprov_db_open(
2122     BackendDB *be
2123 )
2124 {
2125         slap_overinst   *on = (slap_overinst *) be->bd_info;
2126         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2127
2128         Connection conn;
2129         char opbuf[OPERATION_BUFFER_SIZE];
2130         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2131         Operation *op = (Operation *)opbuf;
2132         Entry *e;
2133         Attribute *a;
2134         int rc;
2135
2136         if ( slapMode & SLAP_TOOL_MODE ) {
2137                 return 0;
2138         }
2139
2140         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2141         if ( rc ) {
2142                 return rc;
2143         }
2144
2145         connection_fake_init( &conn, op, thrctx );
2146         op->o_bd = be;
2147         op->o_dn = be->be_rootdn;
2148         op->o_ndn = be->be_rootndn;
2149
2150         ctxcsnbuf[0] = '\0';
2151
2152         op->o_bd->bd_info = on->on_info->oi_orig;
2153         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2154                 slap_schema.si_ad_contextCSN, 0, &e );
2155
2156         if ( e ) {
2157                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2158                 if ( a ) {
2159                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2160                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2161                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2162                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2163                                 si->si_ctxcsn.bv_len );
2164                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2165                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2166                 }
2167                 be_entry_release_rw( op, e, 0 );
2168                 op->o_bd->bd_info = (BackendInfo *)on;
2169                 op->o_req_dn = be->be_suffix[0];
2170                 op->o_req_ndn = be->be_nsuffix[0];
2171                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2172                 syncprov_findcsn( op, FIND_MAXCSN );
2173         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2174                 /* If we're also a consumer, and we didn't find the context entry,
2175                  * then don't generate anything, wait for our provider to send it
2176                  * to us.
2177                  */
2178                 goto out;
2179         }
2180
2181         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2182                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2183                                 &si->si_ctxcsn, 0 );
2184         }
2185
2186         /* If our ctxcsn is different from what was read from the root
2187          * entry, write the new value out.
2188          */
2189         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2190                 SlapReply rs = {REP_RESULT};
2191                 syncprov_checkpoint( op, &rs, on );
2192         }
2193
2194 out:
2195         op->o_bd->bd_info = (BackendInfo *)on;
2196         return 0;
2197 }
2198
2199 /* Write the current contextCSN into the underlying db.
2200  */
2201 static int
2202 syncprov_db_close(
2203     BackendDB *be
2204 )
2205 {
2206     slap_overinst   *on = (slap_overinst *) be->bd_info;
2207     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2208         int i;
2209
2210         if ( slapMode & SLAP_TOOL_MODE ) {
2211                 return 0;
2212         }
2213         if ( si->si_numops ) {
2214                 Connection conn;
2215                 char opbuf[OPERATION_BUFFER_SIZE];
2216                 Operation *op = (Operation *)opbuf;
2217                 SlapReply rs = {REP_RESULT};
2218
2219                 connection_fake_init( &conn, op, thrctx );
2220                 op->o_bd = be;
2221                 op->o_dn = be->be_rootdn;
2222                 op->o_ndn = be->be_rootndn;
2223                 syncprov_checkpoint( op, &rs, on );
2224         }
2225         for ( i=0; thrctx[i].key; i++) {
2226                 if ( thrctx[i].xfree )
2227                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2228                 thrctx[i].key = NULL;
2229         }
2230
2231     return 0;
2232 }
2233
2234 static int
2235 syncprov_db_init(
2236         BackendDB *be
2237 )
2238 {
2239         slap_overinst   *on = (slap_overinst *)be->bd_info;
2240         syncprov_info_t *si;
2241
2242         si = ch_calloc(1, sizeof(syncprov_info_t));
2243         on->on_bi.bi_private = si;
2244         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2245         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2246         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2247         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2248
2249         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2250         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2251
2252         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2253         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2254
2255         return 0;
2256 }
2257
2258 static int
2259 syncprov_db_destroy(
2260         BackendDB *be
2261 )
2262 {
2263         slap_overinst   *on = (slap_overinst *)be->bd_info;
2264         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2265
2266         if ( si ) {
2267                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2268                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2269                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2270                 ch_free( si );
2271         }
2272
2273         return 0;
2274 }
2275
2276 static int syncprov_parseCtrl (
2277         Operation *op,
2278         SlapReply *rs,
2279         LDAPControl *ctrl )
2280 {
2281         ber_tag_t tag;
2282         BerElement *ber;
2283         ber_int_t mode;
2284         ber_len_t len;
2285         struct berval cookie = BER_BVNULL;
2286         sync_control *sr;
2287         int rhint = 0;
2288
2289         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2290                 rs->sr_text = "Sync control specified multiple times";
2291                 return LDAP_PROTOCOL_ERROR;
2292         }
2293
2294         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2295                 rs->sr_text = "Sync control specified with pagedResults control";
2296                 return LDAP_PROTOCOL_ERROR;
2297         }
2298
2299         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2300                 rs->sr_text = "Sync control value is empty (or absent)";
2301                 return LDAP_PROTOCOL_ERROR;
2302         }
2303
2304         /* Parse the control value
2305          *      syncRequestValue ::= SEQUENCE {
2306          *              mode   ENUMERATED {
2307          *                      -- 0 unused
2308          *                      refreshOnly             (1),
2309          *                      -- 2 reserved
2310          *                      refreshAndPersist       (3)
2311          *              },
2312          *              cookie  syncCookie OPTIONAL
2313          *      }
2314          */
2315
2316         ber = ber_init( &ctrl->ldctl_value );
2317         if( ber == NULL ) {
2318                 rs->sr_text = "internal error";
2319                 return LDAP_OTHER;
2320         }
2321
2322         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2323                 rs->sr_text = "Sync control : mode decoding error";
2324                 return LDAP_PROTOCOL_ERROR;
2325         }
2326
2327         switch( mode ) {
2328         case LDAP_SYNC_REFRESH_ONLY:
2329                 mode = SLAP_SYNC_REFRESH;
2330                 break;
2331         case LDAP_SYNC_REFRESH_AND_PERSIST:
2332                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2333                 break;
2334         default:
2335                 rs->sr_text = "Sync control : unknown update mode";
2336                 return LDAP_PROTOCOL_ERROR;
2337         }
2338
2339         tag = ber_peek_tag( ber, &len );
2340
2341         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2342                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
2343                         rs->sr_text = "Sync control : cookie decoding error";
2344                         return LDAP_PROTOCOL_ERROR;
2345                 }
2346         }
2347         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2348                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2349                         rs->sr_text = "Sync control : rhint decoding error";
2350                         return LDAP_PROTOCOL_ERROR;
2351                 }
2352         }
2353         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2354                         rs->sr_text = "Sync control : decoding error";
2355                         return LDAP_PROTOCOL_ERROR;
2356         }
2357         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2358         sr->sr_rhint = rhint;
2359         if (!BER_BVISNULL(&cookie)) {
2360                 ber_dupbv( &sr->sr_state.octet_str, &cookie );
2361                 slap_parse_sync_cookie( &sr->sr_state );
2362         }
2363
2364         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2365
2366         (void) ber_free( ber, 1 );
2367
2368         op->o_sync = ctrl->ldctl_iscritical
2369                 ? SLAP_CONTROL_CRITICAL
2370                 : SLAP_CONTROL_NONCRITICAL;
2371
2372         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2373
2374         return LDAP_SUCCESS;
2375 }
2376
2377 /* This overlay is set up for dynamic loading via moduleload. For static
2378  * configuration, you'll need to arrange for the slap_overinst to be
2379  * initialized and registered by some other function inside slapd.
2380  */
2381
2382 static slap_overinst            syncprov;
2383
2384 int
2385 syncprov_init()
2386 {
2387         int rc;
2388
2389         rc = register_supported_control( LDAP_CONTROL_SYNC,
2390                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2391                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2392         if ( rc != LDAP_SUCCESS ) {
2393                 Debug( LDAP_DEBUG_ANY,
2394                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2395                 return rc;
2396         }
2397
2398         syncprov.on_bi.bi_type = "syncprov";
2399         syncprov.on_bi.bi_db_init = syncprov_db_init;
2400         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2401         syncprov.on_bi.bi_db_open = syncprov_db_open;
2402         syncprov.on_bi.bi_db_close = syncprov_db_close;
2403
2404         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2405         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2406
2407         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2408         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2409         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2410         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2411         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2412         syncprov.on_bi.bi_op_search = syncprov_op_search;
2413         syncprov.on_bi.bi_extended = syncprov_op_extended;
2414         syncprov.on_bi.bi_operational = syncprov_operational;
2415
2416         syncprov.on_bi.bi_cf_ocs = spocs;
2417
2418         rc = config_register_schema( spcfg, spocs );
2419         if ( rc ) return rc;
2420
2421         return overlay_register( &syncprov );
2422 }
2423
2424 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2425 int
2426 init_module( int argc, char *argv[] )
2427 {
2428         return syncprov_init();
2429 }
2430 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2431
2432 #endif /* defined(SLAPD_OVER_SYNCPROV) */