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
 163         BerElementBuffer berbuf;
 164         BerElement *ber = (BerElement *)&berbuf;
 165
 166         struct berval   entryuuid_bv = BER_BVNULL;
 167
 168         ber_init2( ber, 0, LBER_USE_DER );
 169         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 170
 171         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 172
 173         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 174                 AttributeDescription *desc = a->a_desc;
 175                 if ( desc == slap_schema.si_ad_entryUUID ) {
 176                         entryuuid_bv = a->a_nvals[0];
 177                         break;
 178                 }
 179         }
 180
 181         if ( send_cookie && cookie ) {
 182                 ber_printf( ber, "{eOON}",
 183                         entry_sync_state, &entryuuid_bv, cookie );
 184         } else {
 185                 ber_printf( ber, "{eON}",
 186                         entry_sync_state, &entryuuid_bv );
 187         }
 188
 189         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 190         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 191         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 192
 193         ber_free_buf( ber );
 194
 195         if ( ret < 0 ) {
 196                 Debug( LDAP_DEBUG_TRACE,
 197                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 198                         0, 0, 0 );
 199                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 200                 return ret;
 201         }
 202
 203         return LDAP_SUCCESS;
 204 }
 205
 206 /* Build a LDAPsync final state control */
 207 static int
 208 syncprov_done_ctrl(
 209         Operation       *op,
 210         SlapReply       *rs,
 211         LDAPControl     **ctrls,
 212         int                     num_ctrls,
 213         int                     send_cookie,
 214         struct berval *cookie,
 215         int                     refreshDeletes )
 216 {
 217         int ret;
 218         BerElementBuffer berbuf;
 219         BerElement *ber = (BerElement *)&berbuf;
 220
 221         ber_init2( ber, NULL, LBER_USE_DER );
 222         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 223
 224         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 225
 226         ber_printf( ber, "{" );
 227         if ( send_cookie && cookie ) {
 228                 ber_printf( ber, "O", cookie );
 229         }
 230         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 231                 ber_printf( ber, "b", refreshDeletes );
 232         }
 233         ber_printf( ber, "N}" );
 234
 235         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 236         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 237         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 238
 239         ber_free_buf( ber );
 240
 241         if ( ret < 0 ) {
 242                 Debug( LDAP_DEBUG_TRACE,
 243                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 244                         0, 0, 0 );
 245                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 246                 return ret;
 247         }
 248
 249         return LDAP_SUCCESS;
 250 }
 251
 252 static int
 253 syncprov_sendinfo(
 254         Operation       *op,
 255         SlapReply       *rs,
 256         int                     type,
 257         struct berval *cookie,
 258         int                     refreshDone,
 259         BerVarray       syncUUIDs,
 260         int                     refreshDeletes )
 261 {
 262         BerElementBuffer berbuf;
 263         BerElement *ber = (BerElement *)&berbuf;
 264         struct berval rspdata;
 265
 266         int ret;
 267
 268         ber_init2( ber, NULL, LBER_USE_DER );
 269         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 270
 271         if ( type ) {
 272                 switch ( type ) {
 273                 case LDAP_TAG_SYNC_NEW_COOKIE:
 274                         ber_printf( ber, "tO", type, cookie );
 275                         break;
 276                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 277                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 278                         ber_printf( ber, "t{", type );
 279                         if ( cookie ) {
 280                                 ber_printf( ber, "O", cookie );
 281                         }
 282                         if ( refreshDone == 0 ) {
 283                                 ber_printf( ber, "b", refreshDone );
 284                         }
 285                         ber_printf( ber, "N}" );
 286                         break;
 287                 case LDAP_TAG_SYNC_ID_SET:
 288                         ber_printf( ber, "t{", type );
 289                         if ( cookie ) {
 290                                 ber_printf( ber, "O", cookie );
 291                         }
 292                         if ( refreshDeletes == 1 ) {
 293                                 ber_printf( ber, "b", refreshDeletes );
 294                         }
 295                         ber_printf( ber, "[W]", syncUUIDs );
 296                         ber_printf( ber, "N}" );
 297                         break;
 298                 default:
 299                         Debug( LDAP_DEBUG_TRACE,
 300                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 301                                 type, 0, 0 );
 302                         return LDAP_OTHER;
 303                 }
 304         }
 305
 306         ret = ber_flatten2( ber, &rspdata, 0 );
 307
 308         if ( ret < 0 ) {
 309                 Debug( LDAP_DEBUG_TRACE,
 310                         "syncprov_sendinfo: ber_flatten2 failed\n",
 311                         0, 0, 0 );
 312                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 313                 return ret;
 314         }
 315
 316         rs->sr_rspoid = LDAP_SYNC_INFO;
 317         rs->sr_rspdata = &rspdata;
 318         send_ldap_intermediate( op, rs );
 319         rs->sr_rspdata = NULL;
 320         ber_free_buf( ber );
 321
 322         return LDAP_SUCCESS;
 323 }
 324
 325 /* Find a modtarget in an AVL tree */
 326 static int
 327 sp_avl_cmp( const void *c1, const void *c2 )
 328 {
 329         const modtarget *m1, *m2;
 330         int rc;
 331
 332         m1 = c1; m2 = c2;
 333         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 334
 335         if ( rc ) return rc;
 336         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 337 }
 338
 339 /* syncprov_findbase:
 340  *   finds the true DN of the base of a search (with alias dereferencing) and
 341  * checks to make sure the base entry doesn't get replaced with a different
 342  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 343  * change is detected, any persistent search on this base must be terminated /
 344  * reloaded.
 345  *   On the first call, we just save the DN and entryID. On subsequent calls
 346  * we compare the DN and entryID with the saved values.
 347  */
 348 static int
 349 findbase_cb( Operation *op, SlapReply *rs )
 350 {
 351         slap_callback *sc = op->o_callback;
 352
 353         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 354                 fbase_cookie *fc = sc->sc_private;
 355
 356                 /* If no entryID, we're looking for the first time.
 357                  * Just store whatever we got.
 358                  */
 359                 if ( fc->fss->s_eid == NOID ) {
 360                         fc->fbase = 1;
 361                         fc->fss->s_eid = rs->sr_entry->e_id;
 362                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 363
 364                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 365                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 366
 367                 /* OK, the DN is the same and the entryID is the same. Now
 368                  * see if the fdn resides in the scope.
 369                  */
 370                         fc->fbase = 1;
 371                         switch ( fc->fss->s_op->ors_scope ) {
 372                         case LDAP_SCOPE_BASE:
 373                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 374                                 break;
 375                         case LDAP_SCOPE_ONELEVEL: {
 376                                 struct berval pdn;
 377                                 dnParent( fc->fdn, &pdn );
 378                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 379                                 break; }
 380                         case LDAP_SCOPE_SUBTREE:
 381                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 382                                 break;
 383 #ifdef LDAP_SCOPE_SUBORDINATE
 384                         case LDAP_SCOPE_SUBORDINATE:
 385                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 386                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 387                                 break;
 388 #endif
 389                         }
 390                 }
 391         }
 392         if ( rs->sr_err != LDAP_SUCCESS ) {
 393                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 394         }
 395         return LDAP_SUCCESS;
 396 }
 397
 398 static int
 399 syncprov_findbase( Operation *op, fbase_cookie *fc )
 400 {
 401         opcookie *opc = op->o_callback->sc_private;
 402         slap_overinst *on = opc->son;
 403
 404         slap_callback cb = {0};
 405         Operation fop;
 406         SlapReply frs = { REP_RESULT };
 407         int rc;
 408
 409         fop = *op;
 410
 411         cb.sc_response = findbase_cb;
 412         cb.sc_private = fc;
 413
 414         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 415         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 416         fop.o_callback = &cb;
 417         fop.o_tag = LDAP_REQ_SEARCH;
 418         fop.ors_scope = LDAP_SCOPE_BASE;
 419         fop.ors_deref = fc->fss->s_op->ors_deref;
 420         fop.ors_limit = NULL;
 421         fop.ors_slimit = 1;
 422         fop.ors_tlimit = SLAP_NO_LIMIT;
 423         fop.ors_attrs = slap_anlist_no_attrs;
 424         fop.ors_attrsonly = 1;
 425         fop.ors_filter = fc->fss->s_op->ors_filter;
 426         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 427
 428         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 429
 430         fop.o_bd->bd_info = on->on_info->oi_orig;
 431         rc = fop.o_bd->be_search( &fop, &frs );
 432         fop.o_bd->bd_info = (BackendInfo *)on;
 433
 434         if ( fc->fbase ) return LDAP_SUCCESS;
 435
 436         /* If entryID has changed, then the base of this search has
 437          * changed. Invalidate the psearch.
 438          */
 439         return LDAP_NO_SUCH_OBJECT;
 440 }
 441
 442 /* syncprov_findcsn:
 443  *   This function has three different purposes, but they all use a search
 444  * that filters on entryCSN so they're combined here.
 445  * 1: at startup time, after a contextCSN has been read from the database,
 446  * we search for all entries with CSN >= contextCSN in case the contextCSN
 447  * was not checkpointed at the previous shutdown.
 448  *
 449  * 2: when the current contextCSN is known and we have a sync cookie, we search
 450  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 451  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 452  *
 453  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 454  * CSN, and generate Present records for them. We always collect this result
 455  * in SyncID sets, even if there's only one match.
 456  */
 457 #define FIND_MAXCSN     1
 458 #define FIND_CSN        2
 459 #define FIND_PRESENT    3
 460
 461 static int
 462 findmax_cb( Operation *op, SlapReply *rs )
 463 {
 464         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 465                 struct berval *maxcsn = op->o_callback->sc_private;
 466                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 467                         slap_schema.si_ad_entryCSN );
 468
 469                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 470                         maxcsn->bv_len = a->a_vals[0].bv_len;
 471                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 472                 }
 473         }
 474         return LDAP_SUCCESS;
 475 }
 476
 477 static int
 478 findcsn_cb( Operation *op, SlapReply *rs )
 479 {
 480         slap_callback *sc = op->o_callback;
 481
 482         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 483                 sc->sc_private = (void *)1;
 484         }
 485         return LDAP_SUCCESS;
 486 }
 487
 488 /* Build a list of entryUUIDs for sending in a SyncID set */
 489
 490 #define UUID_LEN        16
 491
 492 typedef struct fpres_cookie {
 493         int num;
 494         BerVarray uuids;
 495         char *last;
 496 } fpres_cookie;
 497
 498 static int
 499 findpres_cb( Operation *op, SlapReply *rs )
 500 {
 501         slap_callback *sc = op->o_callback;
 502         fpres_cookie *pc = sc->sc_private;
 503         Attribute *a;
 504         int ret = SLAP_CB_CONTINUE;
 505
 506         switch ( rs->sr_type ) {
 507         case REP_SEARCH:
 508                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 509                 if ( a ) {
 510                         pc->uuids[pc->num].bv_val = pc->last;
 511                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 512                                 pc->uuids[pc->num].bv_len );
 513                         pc->num++;
 514                         pc->last = pc->uuids[pc->num].bv_val;
 515                         pc->uuids[pc->num].bv_val = NULL;
 516                 }
 517                 ret = LDAP_SUCCESS;
 518                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 519                         break;
 520                 /* FALLTHRU */
 521         case REP_RESULT:
 522                 ret = rs->sr_err;
 523                 if ( pc->num ) {
 524                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 525                                 0, pc->uuids, 0 );
 526                         pc->uuids[pc->num].bv_val = pc->last;
 527                         pc->num = 0;
 528                         pc->last = pc->uuids[0].bv_val;
 529                 }
 530                 break;
 531         default:
 532                 break;
 533         }
 534         return ret;
 535 }
 536
 537 static int
 538 syncprov_findcsn( Operation *op, int mode )
 539 {
 540         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 541         syncprov_info_t         *si = on->on_bi.bi_private;
 542
 543         slap_callback cb = {0};
 544         Operation fop;
 545         SlapReply frs = { REP_RESULT };
 546         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 547         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 548         struct berval maxcsn;
 549         Filter cf, af;
 550 #ifdef LDAP_COMP_MATCH
 551         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 552 #else
 553         AttributeAssertion eq = { NULL, BER_BVNULL };
 554 #endif
 555         int i, rc = LDAP_SUCCESS;
 556         fpres_cookie pcookie;
 557         sync_control *srs = NULL;
 558         int findcsn_retry = 1;
 559
 560         if ( mode != FIND_MAXCSN ) {
 561                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 562
 563                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 564                         return LDAP_OTHER;
 565                 }
 566         }
 567
 568         fop = *op;
 569         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 570         /* We want pure entries, not referrals */
 571         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 572
 573         cf.f_ava = &eq;
 574         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 575         cf.f_next = NULL;
 576
 577         fop.o_callback = &cb;
 578         fop.ors_limit = NULL;
 579         fop.ors_tlimit = SLAP_NO_LIMIT;
 580         fop.ors_filter = &cf;
 581         fop.ors_filterstr.bv_val = buf;
 582
 583 again:
 584         switch( mode ) {
 585         case FIND_MAXCSN:
 586                 cf.f_choice = LDAP_FILTER_GE;
 587                 cf.f_av_value = si->si_ctxcsn;
 588                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 589                         cf.f_av_value.bv_val );
 590                 fop.ors_attrsonly = 0;
 591                 fop.ors_attrs = csn_anlist;
 592                 fop.ors_slimit = SLAP_NO_LIMIT;
 593                 cb.sc_private = &maxcsn;
 594                 cb.sc_response = findmax_cb;
 595                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 596                 maxcsn.bv_val = cbuf;
 597                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 598                 break;
 599         case FIND_CSN:
 600                 cf.f_av_value = srs->sr_state.ctxcsn;
 601                 /* Look for exact match the first time */
 602                 if ( findcsn_retry ) {
 603                         cf.f_choice = LDAP_FILTER_EQUALITY;
 604                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 605                                 cf.f_av_value.bv_val );
 606                 /* On retry, look for <= */
 607                 } else {
 608                         cf.f_choice = LDAP_FILTER_LE;
 609                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 610                                 cf.f_av_value.bv_val );
 611                 }
 612                 fop.ors_attrsonly = 1;
 613                 fop.ors_attrs = slap_anlist_no_attrs;
 614                 fop.ors_slimit = 1;
 615                 cb.sc_private = NULL;
 616                 cb.sc_response = findcsn_cb;
 617                 break;
 618         case FIND_PRESENT:
 619                 af.f_choice = LDAP_FILTER_AND;
 620                 af.f_next = NULL;
 621                 af.f_and = &cf;
 622                 cf.f_choice = LDAP_FILTER_LE;
 623                 cf.f_av_value = srs->sr_state.ctxcsn;
 624                 cf.f_next = op->ors_filter;
 625                 fop.ors_filter = &af;
 626                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 627                 fop.ors_attrsonly = 0;
 628                 fop.ors_attrs = uuid_anlist;
 629                 fop.ors_slimit = SLAP_NO_LIMIT;
 630                 cb.sc_private = &pcookie;
 631                 cb.sc_response = findpres_cb;
 632                 pcookie.num = 0;
 633
 634                 /* preallocate storage for a full set */
 635                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 636                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 637                         op->o_tmpmemctx );
 638                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 639                 pcookie.uuids[0].bv_val = pcookie.last;
 640                 pcookie.uuids[0].bv_len = UUID_LEN;
 641                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 642                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 643                         pcookie.uuids[i].bv_len = UUID_LEN;
 644                 }
 645                 break;
 646         }
 647
 648         fop.o_bd->bd_info = on->on_info->oi_orig;
 649         fop.o_bd->be_search( &fop, &frs );
 650         fop.o_bd->bd_info = (BackendInfo *)on;
 651
 652         switch( mode ) {
 653         case FIND_MAXCSN:
 654                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 655                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 656                 break;
 657         case FIND_CSN:
 658                 /* If matching CSN was not found, invalidate the context. */
 659                 if ( !cb.sc_private ) {
 660                         /* If we didn't find an exact match, then try for <= */
 661                         if ( findcsn_retry ) {
 662                                 findcsn_retry = 0;
 663                                 goto again;
 664                         }
 665                         rc = LDAP_NO_SUCH_OBJECT;
 666                 }
 667                 break;
 668         case FIND_PRESENT:
 669                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 670                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 671                 break;
 672         }
 673
 674         return rc;
 675 }
 676
 677 /* Queue a persistent search response */
 678 static int
 679 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 680 {
 681         syncres *sr;
 682
 683         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 684                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 685         sr->s_next = NULL;
 686         sr->s_dn.bv_val = (char *)(sr + 1);
 687         sr->s_dn.bv_len = opc->sdn.bv_len;
 688         sr->s_mode = mode;
 689         sr->s_isreference = opc->sreference;
 690         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 691         sr->s_ndn.bv_len = opc->sndn.bv_len;
 692         *(sr->s_ndn.bv_val++) = '\0';
 693         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 694         sr->s_uuid.bv_len = opc->suuid.bv_len;
 695         *(sr->s_uuid.bv_val++) = '\0';
 696         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 697         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 698         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 699
 700         if ( !so->s_res ) {
 701                 so->s_res = sr;
 702         } else {
 703                 so->s_restail->s_next = sr;
 704         }
 705         so->s_restail = sr;
 706         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 707         return LDAP_SUCCESS;
 708 }
 709
 710 /* Play back queued responses */
 711 static int
 712 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue );
 713
 714 static int
 715 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 716 {
 717         syncres *sr, *srnext;
 718         Entry *e;
 719         opcookie opc;
 720         int rc;
 721
 722         opc.son = on;
 723         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 724         for (sr = so->s_res; sr; sr=srnext) {
 725                 srnext = sr->s_next;
 726                 opc.sdn = sr->s_dn;
 727                 opc.sndn = sr->s_ndn;
 728                 opc.suuid = sr->s_uuid;
 729                 opc.sctxcsn = sr->s_csn;
 730                 opc.sreference = sr->s_isreference;
 731                 e = NULL;
 732
 733                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 734                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 735                         if ( rc ) {
 736                                 ch_free( sr );
 737                                 so->s_res = srnext;
 738                                 continue;
 739                         }
 740                 }
 741                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode, 0 );
 742
 743                 if ( e ) {
 744                         be_entry_release_rw( op, e, 0 );
 745                 }
 746                 if ( rc )
 747                         break;
 748
 749                 ch_free( sr );
 750                 so->s_res = srnext;
 751         }
 752         op->o_bd->bd_info = (BackendInfo *)on;
 753         if ( !so->s_res )
 754                 so->s_restail = NULL;
 755         return rc;
 756 }
 757
 758 /* Send a persistent search response */
 759 static int
 760 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue )
 761 {
 762         slap_overinst *on = opc->son;
 763
 764         SlapReply rs = { REP_SEARCH };
 765         LDAPControl *ctrls[2];
 766         struct berval cookie;
 767         Entry e_uuid = {0};
 768         Attribute a_uuid = {0};
 769         Operation sop = *so->s_op;
 770         Opheader ohdr;
 771
 772         if ( so->s_op->o_abandon )
 773                 return SLAPD_ABANDON;
 774
 775         ohdr = *sop.o_hdr;
 776         sop.o_hdr = &ohdr;
 777         sop.o_tmpmemctx = op->o_tmpmemctx;
 778         sop.o_bd = op->o_bd;
 779         sop.o_controls = op->o_controls;
 780         sop.o_private = op->o_private;
 781
 782         /* If queueing is allowed */
 783         if ( queue ) {
 784                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 785                 /* If we're still in refresh mode, must queue */
 786                 if (so->s_flags & PS_IS_REFRESHING) {
 787                         return syncprov_qresp( opc, so, mode );
 788                 }
 789                 /* If connection is free but queue is non-empty,
 790                  * try to flush the queue.
 791                  */
 792                 if ( so->s_res ) {
 793                         rs.sr_err = syncprov_qplay( &sop, on, so );
 794                 }
 795                 /* If the connection is busy, must queue */
 796                 if ( sop.o_conn->c_writewaiter || rs.sr_err == LDAP_BUSY ) {
 797                         return syncprov_qresp( opc, so, mode );
 798                 }
 799                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 800
 801                 /* If syncprov_qplay returned any other error, bail out. */
 802                 if ( rs.sr_err ) {
 803                         return rs.sr_err;
 804                 }
 805         } else {
 806                 /* Queueing not allowed and conn is busy, give up */
 807                 if ( sop.o_conn->c_writewaiter )
 808                         return LDAP_BUSY;
 809         }
 810
 811         ctrls[1] = NULL;
 812         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 813
 814         e_uuid.e_attrs = &a_uuid;
 815         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 816         a_uuid.a_nvals = &opc->suuid;
 817         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 818                 mode, ctrls, 0, 1, &cookie );
 819
 820         rs.sr_ctrls = ctrls;
 821         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 822         switch( mode ) {
 823         case LDAP_SYNC_ADD:
 824                 rs.sr_entry = *e;
 825                 if ( rs.sr_entry->e_private )
 826                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 827                 if ( opc->sreference ) {
 828                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 829                         send_search_reference( &sop, &rs );
 830                         ber_bvarray_free( rs.sr_ref );
 831                         if ( !rs.sr_entry )
 832                                 *e = NULL;
 833                         break;
 834                 }
 835                 /* fallthru */
 836         case LDAP_SYNC_MODIFY:
 837                 rs.sr_entry = *e;
 838                 if ( rs.sr_entry->e_private )
 839                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 840                 rs.sr_attrs = sop.ors_attrs;
 841                 send_search_entry( &sop, &rs );
 842                 if ( !rs.sr_entry )
 843                         *e = NULL;
 844                 break;
 845         case LDAP_SYNC_DELETE:
 846                 e_uuid.e_attrs = NULL;
 847                 e_uuid.e_name = opc->sdn;
 848                 e_uuid.e_nname = opc->sndn;
 849                 rs.sr_entry = &e_uuid;
 850                 if ( opc->sreference ) {
 851                         struct berval bv = BER_BVNULL;
 852                         rs.sr_ref = &bv;
 853                         send_search_reference( &sop, &rs );
 854                 } else {
 855                         send_search_entry( &sop, &rs );
 856                 }
 857                 break;
 858         default:
 859                 assert(0);
 860         }
 861         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 862         op->o_private = sop.o_private;
 863         rs.sr_ctrls = NULL;
 864         /* Check queue again here; if we were hanging in a send and eventually
 865          * recovered, there may be more to send now. But don't check if the
 866          * original psearch has been abandoned.
 867          */
 868         if ( so->s_op->o_abandon )
 869                 return SLAPD_ABANDON;
 870
 871         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 872                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 873                 rs.sr_err = syncprov_qplay( &sop, on, so );
 874                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 875         }
 876         return rs.sr_err;
 877 }
 878
 879 static void
 880 syncprov_free_syncop( syncops *so )
 881 {
 882         syncres *sr, *srnext;
 883         GroupAssertion *ga, *gnext;
 884
 885         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 886         so->s_inuse--;
 887         if ( so->s_inuse > 0 ) {
 888                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 889                 return;
 890         }
 891         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 892         if ( so->s_flags & PS_IS_DETACHED ) {
 893                 filter_free( so->s_op->ors_filter );
 894                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 895                         gnext = ga->ga_next;
 896                         ch_free( ga );
 897                 }
 898                 ch_free( so->s_op );
 899         }
 900         ch_free( so->s_base.bv_val );
 901         for ( sr=so->s_res; sr; sr=srnext ) {
 902                 srnext = sr->s_next;
 903                 ch_free( sr );
 904         }
 905         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 906         ch_free( so );
 907 }
 908
 909 static int
 910 syncprov_drop_psearch( syncops *so, int lock )
 911 {
 912         if ( so->s_flags & PS_IS_DETACHED ) {
 913                 if ( lock )
 914                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 915                 so->s_op->o_conn->c_n_ops_executing--;
 916                 so->s_op->o_conn->c_n_ops_completed++;
 917                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 918                         o_next );
 919                 if ( lock )
 920                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 921         }
 922         syncprov_free_syncop( so );
 923
 924         return 0;
 925 }
 926
 927 static int
 928 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 929 {
 930         slap_callback *sc = op->o_callback;
 931         op->o_callback = sc->sc_next;
 932         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 933         op->o_tmpfree( sc, op->o_tmpmemctx );
 934         return 0;
 935 }
 936
 937 static int
 938 syncprov_op_abandon( Operation *op, SlapReply *rs )
 939 {
 940         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 941         syncprov_info_t         *si = on->on_bi.bi_private;
 942         syncops *so, *soprev;
 943
 944         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 945         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 946                 soprev=so, so=so->s_next ) {
 947                 if ( so->s_op->o_connid == op->o_connid &&
 948                         so->s_op->o_msgid == op->orn_msgid ) {
 949                                 so->s_op->o_abandon = 1;
 950                                 soprev->s_next = so->s_next;
 951                                 break;
 952                 }
 953         }
 954         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 955         if ( so ) {
 956                 /* Is this really a Cancel exop? */
 957                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 958                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 959                         rs->sr_err = LDAP_CANCELLED;
 960                         send_ldap_result( so->s_op, rs );
 961                         if ( so->s_flags & PS_IS_DETACHED ) {
 962                                 slap_callback *cb;
 963                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 964                                 cb->sc_cleanup = syncprov_ab_cleanup;
 965                                 cb->sc_next = op->o_callback;
 966                                 cb->sc_private = so;
 967                                 return SLAP_CB_CONTINUE;
 968                         }
 969                 }
 970                 syncprov_drop_psearch( so, 0 );
 971         }
 972         return SLAP_CB_CONTINUE;
 973 }
 974
 975 /* Find which persistent searches are affected by this operation */
 976 static void
 977 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 978 {
 979         slap_overinst *on = opc->son;
 980         syncprov_info_t         *si = on->on_bi.bi_private;
 981
 982         fbase_cookie fc;
 983         syncops *ss, *sprev, *snext;
 984         Entry *e;
 985         Attribute *a;
 986         int rc;
 987         struct berval newdn;
 988         int freefdn = 0;
 989
 990         fc.fdn = &op->o_req_ndn;
 991         /* compute new DN */
 992         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 993                 struct berval pdn;
 994                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 995                 else dnParent( fc.fdn, &pdn );
 996                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 997                 fc.fdn = &newdn;
 998                 freefdn = 1;
 999         }
1000         if ( op->o_tag != LDAP_REQ_ADD ) {
1001                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1002                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1003                 /* If we're sending responses now, make a copy and unlock the DB */
1004                 if ( e && !saveit ) {
1005                         Entry *e2 = entry_dup( e );
1006                         be_entry_release_rw( op, e, 0 );
1007                         e = e2;
1008                 }
1009                 op->o_bd->bd_info = (BackendInfo *)on;
1010                 if ( rc ) return;
1011         } else {
1012                 e = op->ora_e;
1013         }
1014
1015         if ( saveit ) {
1016                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1017                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1018                 opc->sreference = is_entry_referral( e );
1019         }
1020         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1021                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1022                 if ( a )
1023                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1024         }
1025
1026         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1027         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1028                 sprev = ss, ss=snext)
1029         {
1030                 syncmatches *sm;
1031                 int found = 0;
1032
1033                 snext = ss->s_next;
1034                 /* validate base */
1035                 fc.fss = ss;
1036                 fc.fbase = 0;
1037                 fc.fscope = 0;
1038
1039                 /* If the base of the search is missing, signal a refresh */
1040                 rc = syncprov_findbase( op, &fc );
1041                 if ( rc != LDAP_SUCCESS ) {
1042                         SlapReply rs = {REP_RESULT};
1043                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1044                                 "search base has changed" );
1045                         sprev->s_next = snext;
1046                         syncprov_drop_psearch( ss, 1 );
1047                         continue;
1048                 }
1049
1050                 /* If we're sending results now, look for this op in old matches */
1051                 if ( !saveit ) {
1052                         syncmatches *old;
1053                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1054                                 old=sm, sm=sm->sm_next ) {
1055                                 if ( sm->sm_op == ss ) {
1056                                         found = 1;
1057                                         old->sm_next = sm->sm_next;
1058                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1059                                         break;
1060                                 }
1061                         }
1062                 }
1063
1064                 /* check if current o_req_dn is in scope and matches filter */
1065                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1066                         LDAP_COMPARE_TRUE ) {
1067                         if ( saveit ) {
1068                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1069                                 sm->sm_next = opc->smatches;
1070                                 sm->sm_op = ss;
1071                                 ss->s_inuse++;
1072                                 opc->smatches = sm;
1073                         } else {
1074                                 /* if found send UPDATE else send ADD */
1075                                 ss->s_inuse++;
1076                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1077                                 syncprov_sendresp( op, opc, ss, &e,
1078                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1079                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1080                                 ss->s_inuse--;
1081                         }
1082                 } else if ( !saveit && found ) {
1083                         /* send DELETE */
1084                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1085                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1086                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1087                 }
1088         }
1089         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1090
1091         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1092                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1093                 be_entry_release_rw( op, e, 0 );
1094                 op->o_bd->bd_info = (BackendInfo *)on;
1095         }
1096         if ( freefdn ) {
1097                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1098         }
1099 }
1100
1101 static int
1102 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1103 {
1104         slap_callback *cb = op->o_callback;
1105         opcookie *opc = cb->sc_private;
1106         slap_overinst *on = opc->son;
1107         syncprov_info_t         *si = on->on_bi.bi_private;
1108         syncmatches *sm, *snext;
1109         modtarget *mt, mtdummy;
1110
1111         for (sm = opc->smatches; sm; sm=snext) {
1112                 snext = sm->sm_next;
1113                 syncprov_free_syncop( sm->sm_op );
1114                 op->o_tmpfree( sm, op->o_tmpmemctx );
1115         }
1116
1117         /* Remove op from lock table */
1118         mtdummy.mt_op = op;
1119         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1120         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1121         if ( mt ) {
1122                 modinst *mi = mt->mt_mods;
1123
1124                 /* If there are more, promote the next one */
1125                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1126                 if ( mi->mi_next ) {
1127                         mt->mt_mods = mi->mi_next;
1128                         mt->mt_op = mt->mt_mods->mi_op;
1129                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1130                 } else {
1131                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1132                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1133                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1134                         ch_free( mt );
1135                 }
1136         }
1137         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1138         if ( !BER_BVISNULL( &opc->suuid ))
1139                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1140         if ( !BER_BVISNULL( &opc->sndn ))
1141                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1142         if ( !BER_BVISNULL( &opc->sdn ))
1143                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1144         op->o_callback = cb->sc_next;
1145         op->o_tmpfree(cb, op->o_tmpmemctx);
1146
1147         return 0;
1148 }
1149
1150 static void
1151 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1152 {
1153         syncprov_info_t         *si = on->on_bi.bi_private;
1154         Modifications mod;
1155         Operation opm;
1156         struct berval bv[2];
1157         slap_callback cb = {0};
1158         int manage = get_manageDSAit(op);
1159
1160         mod.sml_values = bv;
1161         bv[1].bv_val = NULL;
1162         bv[0] = si->si_ctxcsn;
1163         mod.sml_nvalues = NULL;
1164         mod.sml_desc = slap_schema.si_ad_contextCSN;
1165         mod.sml_op = LDAP_MOD_REPLACE;
1166         mod.sml_flags = 0;
1167         mod.sml_next = NULL;
1168
1169         cb.sc_response = slap_null_cb;
1170         opm = *op;
1171         opm.o_tag = LDAP_REQ_MODIFY;
1172         opm.o_callback = &cb;
1173         opm.orm_modlist = &mod;
1174         opm.o_req_dn = op->o_bd->be_suffix[0];
1175         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1176         opm.o_bd->bd_info = on->on_info->oi_orig;
1177         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1178         opm.o_bd->be_modify( &opm, rs );
1179         opm.o_managedsait = manage;
1180 }
1181
1182 static void
1183 syncprov_add_slog( Operation *op, struct berval *csn )
1184 {
1185         opcookie *opc = op->o_callback->sc_private;
1186         slap_overinst *on = opc->son;
1187         syncprov_info_t         *si = on->on_bi.bi_private;
1188         sessionlog *sl;
1189         slog_entry *se;
1190
1191         sl = si->si_logs;
1192         {
1193                 /* Allocate a record. UUIDs are not NUL-terminated. */
1194                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1195                         csn->bv_len + 1 );
1196                 se->se_next = NULL;
1197                 se->se_tag = op->o_tag;
1198
1199                 se->se_uuid.bv_val = (char *)(se+1);
1200                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1201                 se->se_uuid.bv_len = opc->suuid.bv_len;
1202
1203                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1204                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1205                 se->se_csn.bv_val[csn->bv_len] = '\0';
1206                 se->se_csn.bv_len = csn->bv_len;
1207
1208                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1209                 if ( sl->sl_head ) {
1210                         sl->sl_tail->se_next = se;
1211                 } else {
1212                         sl->sl_head = se;
1213                 }
1214                 sl->sl_tail = se;
1215                 sl->sl_num++;
1216                 while ( sl->sl_num > sl->sl_size ) {
1217                         se = sl->sl_head;
1218                         sl->sl_head = se->se_next;
1219                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1220                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1221                         ch_free( se );
1222                         sl->sl_num--;
1223                         if ( !sl->sl_head ) {
1224                                 sl->sl_tail = NULL;
1225                         }
1226                 }
1227                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1228         }
1229 }
1230
1231 /* Just set a flag if we found the matching entry */
1232 static int
1233 playlog_cb( Operation *op, SlapReply *rs )
1234 {
1235         if ( rs->sr_type == REP_SEARCH ) {
1236                 op->o_callback->sc_private = (void *)1;
1237         }
1238         return rs->sr_err;
1239 }
1240
1241 /* enter with sl->sl_mutex locked, release before returning */
1242 static void
1243 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1244         struct berval *oldcsn, struct berval *ctxcsn )
1245 {
1246         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1247         slog_entry *se;
1248         int i, j, ndel, num, nmods, mmods;
1249         BerVarray uuids;
1250
1251         if ( !sl->sl_num ) {
1252                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1253                 return;
1254         }
1255
1256         num = sl->sl_num;
1257         i = 0;
1258         nmods = 0;
1259
1260         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1261                 num * UUID_LEN, op->o_tmpmemctx );
1262
1263         uuids[0].bv_val = (char *)(uuids + num + 1);
1264
1265         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1266          * and everything else at the end. Do this first so we can
1267          * unlock the list mutex.
1268          */
1269         for ( se=sl->sl_head; se; se=se->se_next ) {
1270                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1271                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1272                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1273                         j = i;
1274                         i++;
1275                 } else {
1276                         nmods++;
1277                         j = num - nmods;
1278                 }
1279                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1280                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1281                 uuids[j].bv_len = UUID_LEN;
1282         }
1283         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1284
1285         ndel = i;
1286
1287         /* Zero out unused slots */
1288         for ( i=ndel; i < num - nmods; i++ )
1289                 uuids[i].bv_len = 0;
1290
1291         /* Mods must be validated to see if they belong in this delete set.
1292          */
1293
1294         mmods = nmods;
1295         /* Strip any duplicates */
1296         for ( i=0; i<nmods; i++ ) {
1297                 for ( j=0; j<ndel; j++ ) {
1298                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1299                                 uuids[num - 1 - i].bv_len = 0;
1300                                 mmods --;
1301                                 break;
1302                         }
1303                 }
1304                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1305                 for ( j=0; j<i; j++ ) {
1306                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1307                                 uuids[num - 1 - i].bv_len = 0;
1308                                 mmods --;
1309                                 break;
1310                         }
1311                 }
1312         }
1313
1314         if ( mmods ) {
1315                 Operation fop;
1316                 SlapReply frs = { REP_RESULT };
1317                 int rc;
1318                 Filter mf, af;
1319 #ifdef LDAP_COMP_MATCH
1320                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1321 #else
1322                 AttributeAssertion eq;
1323 #endif
1324                 slap_callback cb = {0};
1325
1326                 fop = *op;
1327
1328                 fop.o_sync_mode = 0;
1329                 fop.o_callback = &cb;
1330                 fop.ors_limit = NULL;
1331                 fop.ors_tlimit = SLAP_NO_LIMIT;
1332                 fop.ors_attrs = slap_anlist_all_attributes;
1333                 fop.ors_attrsonly = 0;
1334                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1335
1336                 af.f_choice = LDAP_FILTER_AND;
1337                 af.f_next = NULL;
1338                 af.f_and = &mf;
1339                 mf.f_choice = LDAP_FILTER_EQUALITY;
1340                 mf.f_ava = &eq;
1341                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1342                 mf.f_next = fop.ors_filter;
1343
1344                 fop.ors_filter = &af;
1345
1346                 cb.sc_response = playlog_cb;
1347                 fop.o_bd->bd_info = on->on_info->oi_orig;
1348
1349                 for ( i=ndel; i<num; i++ ) {
1350                         if ( uuids[i].bv_len == 0 ) continue;
1351
1352                         mf.f_av_value = uuids[i];
1353                         cb.sc_private = NULL;
1354                         fop.ors_slimit = 1;
1355                         rc = fop.o_bd->be_search( &fop, &frs );
1356
1357                         /* If entry was not found, add to delete list */
1358                         if ( !cb.sc_private ) {
1359                                 uuids[ndel++] = uuids[i];
1360                         }
1361                 }
1362                 fop.o_bd->bd_info = (BackendInfo *)on;
1363         }
1364         if ( ndel ) {
1365                 uuids[ndel].bv_val = NULL;
1366                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1367         }
1368 }
1369
1370 static int
1371 syncprov_op_response( Operation *op, SlapReply *rs )
1372 {
1373         opcookie *opc = op->o_callback->sc_private;
1374         slap_overinst *on = opc->son;
1375         syncprov_info_t         *si = on->on_bi.bi_private;
1376         syncmatches *sm;
1377
1378         if ( rs->sr_err == LDAP_SUCCESS )
1379         {
1380                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1381                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1382
1383                 /* Update our context CSN */
1384                 cbuf[0] = '\0';
1385                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1386                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1387                 if ( !BER_BVISNULL( &maxcsn ) ) {
1388                         strcpy( cbuf, maxcsn.bv_val );
1389                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1390                                 strcpy( si->si_ctxcsnbuf, cbuf );
1391                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1392                         }
1393                 }
1394
1395                 /* Don't do any processing for consumer contextCSN updates */
1396                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1397                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1398                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1399                         return SLAP_CB_CONTINUE;
1400                 }
1401
1402                 si->si_numops++;
1403                 if ( si->si_chkops || si->si_chktime ) {
1404                         int do_check=0;
1405                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1406                                 do_check = 1;
1407                                 si->si_numops = 0;
1408                         }
1409                         if ( si->si_chktime &&
1410                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1411                                 do_check = 1;
1412                                 si->si_chklast = op->o_time;
1413                         }
1414                         if ( do_check ) {
1415                                 syncprov_checkpoint( op, rs, on );
1416                         }
1417                 }
1418                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1419
1420                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1421                 opc->sctxcsn.bv_val = cbuf;
1422
1423                 /* Handle any persistent searches */
1424                 if ( si->si_ops ) {
1425                         switch(op->o_tag) {
1426                         case LDAP_REQ_ADD:
1427                         case LDAP_REQ_MODIFY:
1428                         case LDAP_REQ_MODRDN:
1429                         case LDAP_REQ_EXTENDED:
1430                                 syncprov_matchops( op, opc, 0 );
1431                                 break;
1432                         case LDAP_REQ_DELETE:
1433                                 /* for each match in opc->smatches:
1434                                  *   send DELETE msg
1435                                  */
1436                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1437                                         if ( sm->sm_op->s_op->o_abandon )
1438                                                 continue;
1439                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1440                                                 LDAP_SYNC_DELETE, 1 );
1441                                 }
1442                                 break;
1443                         }
1444                 }
1445
1446                 /* Add any log records */
1447                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1448                         syncprov_add_slog( op, &curcsn );
1449                 }
1450
1451         }
1452         return SLAP_CB_CONTINUE;
1453 }
1454
1455 /* We don't use a subentry to store the context CSN any more.
1456  * We expose the current context CSN as an operational attribute
1457  * of the suffix entry.
1458  */
1459 static int
1460 syncprov_op_compare( Operation *op, SlapReply *rs )
1461 {
1462         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1463         syncprov_info_t         *si = on->on_bi.bi_private;
1464         int rc = SLAP_CB_CONTINUE;
1465
1466         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1467                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1468         {
1469                 Entry e = {0};
1470                 Attribute a = {0};
1471                 struct berval bv[2];
1472
1473                 e.e_name = op->o_bd->be_suffix[0];
1474                 e.e_nname = op->o_bd->be_nsuffix[0];
1475
1476                 BER_BVZERO( &bv[1] );
1477                 bv[0] = si->si_ctxcsn;
1478
1479                 a.a_desc = slap_schema.si_ad_contextCSN;
1480                 a.a_vals = bv;
1481                 a.a_nvals = a.a_vals;
1482
1483                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1484
1485                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1486                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1487                 if ( ! rs->sr_err ) {
1488                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1489                         goto return_results;
1490                 }
1491
1492                 if ( get_assert( op ) &&
1493                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1494                 {
1495                         rs->sr_err = LDAP_ASSERTION_FAILED;
1496                         goto return_results;
1497                 }
1498
1499
1500                 rs->sr_err = LDAP_COMPARE_FALSE;
1501
1502                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1503                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1504                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1505                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1506                 {
1507                         rs->sr_err = LDAP_COMPARE_TRUE;
1508                 }
1509
1510 return_results:;
1511
1512                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1513
1514                 send_ldap_result( op, rs );
1515
1516                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1517                         rs->sr_err = LDAP_SUCCESS;
1518                 }
1519                 rc = rs->sr_err;
1520         }
1521
1522         return rc;
1523 }
1524
1525 static int
1526 syncprov_op_mod( Operation *op, SlapReply *rs )
1527 {
1528         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1529         syncprov_info_t         *si = on->on_bi.bi_private;
1530
1531         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1532                 sizeof(opcookie) +
1533                 (si->si_ops ? sizeof(modinst) : 0 ),
1534                 op->o_tmpmemctx);
1535         opcookie *opc = (opcookie *)(cb+1);
1536         opc->son = on;
1537         cb->sc_response = syncprov_op_response;
1538         cb->sc_cleanup = syncprov_op_cleanup;
1539         cb->sc_private = opc;
1540         cb->sc_next = op->o_callback;
1541         op->o_callback = cb;
1542
1543         /* If there are active persistent searches, lock this operation.
1544          * See seqmod.c for the locking logic on its own.
1545          */
1546         if ( si->si_ops ) {
1547                 modtarget *mt, mtdummy;
1548                 modinst *mi;
1549
1550                 mi = (modinst *)(opc+1);
1551                 mi->mi_op = op;
1552
1553                 /* See if we're already modifying this entry... */
1554                 mtdummy.mt_op = op;
1555                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1556                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1557                 if ( mt ) {
1558                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1559                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1560                         mt->mt_tail->mi_next = mi;
1561                         mt->mt_tail = mi;
1562                         /* wait for this op to get to head of list */
1563                         while ( mt->mt_mods != mi ) {
1564                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1565                                 ldap_pvt_thread_yield();
1566                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1567
1568                                 /* clean up if the caller is giving up */
1569                                 if ( op->o_abandon ) {
1570                                         modinst *m2;
1571                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1572                                                 m2 = m2->mi_next );
1573                                         m2->mi_next = mi->mi_next;
1574                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1575                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1576                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1577                                         return SLAPD_ABANDON;
1578                                 }
1579                         }
1580                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1581                 } else {
1582                         /* Record that we're modifying this entry now */
1583                         mt = ch_malloc( sizeof(modtarget) );
1584                         mt->mt_mods = mi;
1585                         mt->mt_tail = mi;
1586                         mt->mt_op = mi->mi_op;
1587                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1588                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1589                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1590                 }
1591         }
1592
1593         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1594                 syncprov_matchops( op, opc, 1 );
1595
1596         return SLAP_CB_CONTINUE;
1597 }
1598
1599 static int
1600 syncprov_op_extended( Operation *op, SlapReply *rs )
1601 {
1602         if ( exop_is_write( op ))
1603                 return syncprov_op_mod( op, rs );
1604
1605         return SLAP_CB_CONTINUE;
1606 }
1607
1608 typedef struct searchstate {
1609         slap_overinst *ss_on;
1610         syncops *ss_so;
1611         int ss_present;
1612         struct berval ss_ctxcsn;
1613         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1614 } searchstate;
1615
1616 static int
1617 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1618 {
1619         if ( rs->sr_ctrls ) {
1620                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1621                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1622                 rs->sr_ctrls = NULL;
1623         }
1624         return 0;
1625 }
1626
1627 static void
1628 syncprov_detach_op( Operation *op, syncops *so )
1629 {
1630         Operation *op2;
1631         int i, alen = 0;
1632         size_t size;
1633         char *ptr;
1634         GroupAssertion *g1, *g2;
1635
1636         /* count the search attrs */
1637         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1638                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1639         }
1640         /* Make a new copy of the operation */
1641         size = sizeof(Operation) + sizeof(Opheader) +
1642                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1643                 op->o_req_dn.bv_len + 1 +
1644                 op->o_req_ndn.bv_len + 1 +
1645                 op->o_ndn.bv_len + 1 +
1646                 so->s_filterstr.bv_len + 1;
1647         op2 = (Operation *)ch_calloc( 1, size );
1648         op2->o_hdr = (Opheader *)(op2+1);
1649
1650         /* Copy the fields we care about explicitly, leave the rest alone */
1651         *op2->o_hdr = *op->o_hdr;
1652         op2->o_tag = op->o_tag;
1653         op2->o_time = op->o_time;
1654         op2->o_bd = op->o_bd;
1655         op2->o_request = op->o_request;
1656
1657         if ( i ) {
1658                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1659                 ptr = (char *)(op2->ors_attrs+i+1);
1660                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1661                         op2->ors_attrs[i] = op->ors_attrs[i];
1662                         op2->ors_attrs[i].an_name.bv_val = ptr;
1663                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1664                 }
1665                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1666         } else {
1667                 ptr = (char *)(op2->o_hdr + 1);
1668         }
1669         op2->o_authz = op->o_authz;
1670         op2->o_ndn.bv_val = ptr;
1671         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1672         op2->o_dn = op2->o_ndn;
1673         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1674         op2->o_req_dn.bv_val = ptr;
1675         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1676         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1677         op2->o_req_ndn.bv_val = ptr;
1678         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1679         op2->ors_filterstr.bv_val = ptr;
1680         strcpy( ptr, so->s_filterstr.bv_val );
1681         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1682         op2->ors_filter = str2filter( ptr );
1683         so->s_op = op2;
1684
1685         /* Copy any cached group ACLs individually */
1686         op2->o_groups = NULL;
1687         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1688                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1689                 *g2 = *g1;
1690                 strcpy( g2->ga_ndn, g1->ga_ndn );
1691                 g2->ga_next = op2->o_groups;
1692                 op2->o_groups = g2;
1693         }
1694
1695         /* Add op2 to conn so abandon will find us */
1696         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1697         op->o_conn->c_n_ops_executing++;
1698         op->o_conn->c_n_ops_completed--;
1699         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1700         so->s_flags |= PS_IS_DETACHED;
1701         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1702 }
1703
1704 static int
1705 syncprov_search_response( Operation *op, SlapReply *rs )
1706 {
1707         searchstate *ss = op->o_callback->sc_private;
1708         slap_overinst *on = ss->ss_on;
1709         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1710
1711         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1712                 Attribute *a;
1713                 /* If we got a referral without a referral object, there's
1714                  * something missing that we cannot replicate. Just ignore it.
1715                  * The consumer will abort because we didn't send the expected
1716                  * control.
1717                  */
1718                 if ( !rs->sr_entry ) {
1719                         assert( rs->sr_entry != NULL );
1720                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1721                         return SLAP_CB_CONTINUE;
1722                 }
1723                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1724                 if ( a ) {
1725                         /* Make sure entry is less than the snaphot'd contextCSN */
1726                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1727                                 return LDAP_SUCCESS;
1728
1729                         /* Don't send the ctx entry twice */
1730                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1731                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1732                                 return LDAP_SUCCESS;
1733                 }
1734                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1735                         op->o_tmpmemctx );
1736                 rs->sr_ctrls[1] = NULL;
1737                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1738                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1739         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1740                 struct berval cookie;
1741
1742                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1743                         srs->sr_state.rid );
1744
1745                 /* Is this a regular refresh? */
1746                 if ( !ss->ss_so ) {
1747                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1748                                 op->o_tmpmemctx );
1749                         rs->sr_ctrls[1] = NULL;
1750                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1751                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1752                                         LDAP_SYNC_REFRESH_DELETES );
1753                 } else {
1754                         int locked = 0;
1755                 /* It's RefreshAndPersist, transition to Persist phase */
1756                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1757                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1758                                 &cookie, 1, NULL, 0 );
1759                         /* Flush any queued persist messages */
1760                         if ( ss->ss_so->s_res ) {
1761                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1762                                 locked = 1;
1763                                 syncprov_qplay( op, on, ss->ss_so );
1764                         }
1765
1766                         /* Turn off the refreshing flag */
1767                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1768                         if ( locked )
1769                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1770
1771                         /* Detach this Op from frontend control */
1772                         syncprov_detach_op( op, ss->ss_so );
1773
1774                         return LDAP_SUCCESS;
1775                 }
1776         }
1777
1778         return SLAP_CB_CONTINUE;
1779 }
1780
1781 static int
1782 syncprov_op_search( Operation *op, SlapReply *rs )
1783 {
1784         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1785         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1786         slap_callback   *cb;
1787         int gotstate = 0, nochange = 0, do_present = 1;
1788         syncops *sop = NULL;
1789         searchstate *ss;
1790         sync_control *srs;
1791         struct berval ctxcsn;
1792         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1793
1794         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1795
1796         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1797                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1798                 return rs->sr_err;
1799         }
1800
1801         srs = op->o_controls[slap_cids.sc_LDAPsync];
1802         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1803
1804         /* If this is a persistent search, set it up right away */
1805         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1806                 syncops so = {0};
1807                 fbase_cookie fc;
1808                 opcookie opc;
1809                 slap_callback sc;
1810
1811                 fc.fss = &so;
1812                 fc.fbase = 0;
1813                 so.s_eid = NOID;
1814                 so.s_op = op;
1815                 so.s_flags = PS_IS_REFRESHING;
1816                 /* syncprov_findbase expects to be called as a callback... */
1817                 sc.sc_private = &opc;
1818                 opc.son = on;
1819                 cb = op->o_callback;
1820                 op->o_callback = &sc;
1821                 rs->sr_err = syncprov_findbase( op, &fc );
1822                 op->o_callback = cb;
1823
1824                 if ( rs->sr_err != LDAP_SUCCESS ) {
1825                         send_ldap_result( op, rs );
1826                         return rs->sr_err;
1827                 }
1828                 sop = ch_malloc( sizeof( syncops ));
1829                 *sop = so;
1830                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1831                 sop->s_rid = srs->sr_state.rid;
1832                 sop->s_inuse = 1;
1833
1834                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1835                 sop->s_next = si->si_ops;
1836                 si->si_ops = sop;
1837                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1838         }
1839
1840         /* snapshot the ctxcsn */
1841         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1842         strcpy( csnbuf, si->si_ctxcsnbuf );
1843         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1844         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1845         ctxcsn.bv_val = csnbuf;
1846
1847         /* If we have a cookie, handle the PRESENT lookups */
1848         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1849                 sessionlog *sl;
1850
1851                 /* The cookie was validated when it was parsed, just use it */
1852
1853                 /* If just Refreshing and nothing has changed, shortcut it */
1854                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1855                         nochange = 1;
1856                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1857                                 LDAPControl     *ctrls[2];
1858
1859                                 ctrls[0] = NULL;
1860                                 ctrls[1] = NULL;
1861                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1862                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1863                                 rs->sr_ctrls = ctrls;
1864                                 rs->sr_err = LDAP_SUCCESS;
1865                                 send_ldap_result( op, rs );
1866                                 rs->sr_ctrls = NULL;
1867                                 return rs->sr_err;
1868                         }
1869                         goto shortcut;
1870                 }
1871                 /* Do we have a sessionlog for this search? */
1872                 sl=si->si_logs;
1873                 if ( sl ) {
1874                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1875                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1876                                 do_present = 0;
1877                                 /* mutex is unlocked in playlog */
1878                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1879                         } else {
1880                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1881                         }
1882                 }
1883                 /* Is the CSN still present in the database? */
1884                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1885                         /* No, so a reload is required */
1886 #if 0           /* the consumer doesn't seem to send this hint */
1887                         if ( op->o_sync_rhint == 0 ) {
1888                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1889                                 return rs->sr_err;
1890                         }
1891 #endif
1892                 } else {
1893                         gotstate = 1;
1894                         /* If changed and doing Present lookup, send Present UUIDs */
1895                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1896                                 LDAP_SUCCESS ) {
1897                                 send_ldap_result( op, rs );
1898                                 return rs->sr_err;
1899                         }
1900                 }
1901         }
1902
1903 shortcut:
1904         /* Append CSN range to search filter, save original filter
1905          * for persistent search evaluation
1906          */
1907         if ( sop ) {
1908                 sop->s_filterstr= op->ors_filterstr;
1909         }
1910
1911         /* If something changed, find the changes */
1912         if ( gotstate && !nochange ) {
1913                 Filter *fand, *fava;
1914
1915                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1916                 fand->f_choice = LDAP_FILTER_AND;
1917                 fand->f_next = NULL;
1918                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1919                 fand->f_and = fava;
1920                 fava->f_choice = LDAP_FILTER_GE;
1921                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1922                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1923 #ifdef LDAP_COMP_MATCH
1924                 fava->f_ava->aa_cf = NULL;
1925 #endif
1926                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1927                 fava->f_next = op->ors_filter;
1928                 op->ors_filter = fand;
1929                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1930         }
1931
1932         /* Let our callback add needed info to returned entries */
1933         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1934         ss = (searchstate *)(cb+1);
1935         ss->ss_on = on;
1936         ss->ss_so = sop;
1937         ss->ss_present = do_present;
1938         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
1939         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
1940         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
1941         cb->sc_response = syncprov_search_response;
1942         cb->sc_cleanup = syncprov_search_cleanup;
1943         cb->sc_private = ss;
1944         cb->sc_next = op->o_callback;
1945         op->o_callback = cb;
1946
1947 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1948         op->o_sync_mode &= SLAP_CONTROL_MASK;
1949 #endif
1950
1951         /* If this is a persistent search and no changes were reported during
1952          * the refresh phase, just invoke the response callback to transition
1953          * us into persist phase
1954          */
1955         if ( nochange ) {
1956                 rs->sr_err = LDAP_SUCCESS;
1957                 rs->sr_nentries = 0;
1958                 send_ldap_result( op, rs );
1959                 return rs->sr_err;
1960         }
1961         return SLAP_CB_CONTINUE;
1962 }
1963
1964 static int
1965 syncprov_operational(
1966         Operation *op,
1967         SlapReply *rs )
1968 {
1969         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1970         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1971
1972         if ( rs->sr_entry &&
1973                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1974
1975                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1976                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1977                         Attribute *a, **ap = NULL;
1978
1979                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1980                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1981                                         break;
1982                         }
1983
1984                         if ( !a ) {
1985                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1986
1987                                 a = ch_malloc( sizeof(Attribute));
1988                                 a->a_desc = slap_schema.si_ad_contextCSN;
1989                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1990                                 a->a_vals[1].bv_val = NULL;
1991                                 a->a_nvals = a->a_vals;
1992                                 a->a_next = NULL;
1993                                 a->a_flags = 0;
1994                                 *ap = a;
1995                         }
1996
1997                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1998                         if ( !ap ) {
1999                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2000                         } else {
2001                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2002                         }
2003                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2004                 }
2005         }
2006         return SLAP_CB_CONTINUE;
2007 }
2008
2009 enum {
2010         SP_CHKPT = 1,
2011         SP_SESSL
2012 };
2013
2014 static ConfigDriver sp_cf_gen;
2015
2016 static ConfigTable spcfg[] = {
2017         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2018                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2019                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2020                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2021         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2022                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2023                         "DESC 'Session log size in ops' "
2024                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2025         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2026 };
2027
2028 static ConfigOCs spocs[] = {
2029         { "( OLcfgOvOc:1.1 "
2030                 "NAME 'olcSyncProvConfig' "
2031                 "DESC 'SyncRepl Provider configuration' "
2032                 "SUP olcOverlayConfig "
2033                 "MAY ( olcSpCheckpoint $ olcSpSessionlog ) )",
2034                         Cft_Overlay, spcfg },
2035         { NULL, 0, NULL }
2036 };
2037
2038 static int
2039 sp_cf_gen(ConfigArgs *c)
2040 {
2041         slap_overinst           *on = (slap_overinst *)c->bi;
2042         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2043         int rc = 0;
2044
2045         if ( c->op == SLAP_CONFIG_EMIT ) {
2046                 switch ( c->type ) {
2047                 case SP_CHKPT:
2048                         if ( si->si_chkops || si->si_chktime ) {
2049                                 struct berval bv;
2050                                 bv.bv_len = sprintf( c->msg, "%d %d",
2051                                         si->si_chkops, si->si_chktime );
2052                                 bv.bv_val = c->msg;
2053                                 value_add_one( &c->rvalue_vals, &bv );
2054                         } else {
2055                                 rc = 1;
2056                         }
2057                         break;
2058                 case SP_SESSL:
2059                         if ( si->si_logs ) {
2060                                 c->value_int = si->si_logs->sl_size;
2061                         } else {
2062                                 rc = 1;
2063                         }
2064                         break;
2065                 }
2066                 return rc;
2067         } else if ( c->op == LDAP_MOD_DELETE ) {
2068                 switch ( c->type ) {
2069                 case SP_CHKPT:
2070                         si->si_chkops = 0;
2071                         si->si_chktime = 0;
2072                         break;
2073                 case SP_SESSL:
2074                         if ( si->si_logs )
2075                                 si->si_logs->sl_size = 0;
2076                         else
2077                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2078                         break;
2079                 }
2080                 return rc;
2081         }
2082         switch ( c->type ) {
2083         case SP_CHKPT:
2084                 si->si_chkops = atoi( c->argv[1] );
2085                 si->si_chktime = atoi( c->argv[2] ) * 60;
2086                 break;
2087         case SP_SESSL: {
2088                 sessionlog *sl;
2089                 int size = c->value_int;
2090
2091                 if ( size < 0 ) {
2092                         sprintf( c->msg, "%s size %d is negative",
2093                                 c->argv[0], size );
2094                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2095                         return ARG_BAD_CONF;
2096                 }
2097                 sl = si->si_logs;
2098                 if ( !sl ) {
2099                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2100                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2101                         sl->sl_mincsn.bv_len = 0;
2102                         sl->sl_num = 0;
2103                         sl->sl_head = sl->sl_tail = NULL;
2104                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2105                         si->si_logs = sl;
2106                 }
2107                 sl->sl_size = size;
2108                 }
2109                 break;
2110         }
2111         return rc;
2112 }
2113
2114 /* Cheating - we have no thread pool context for these functions,
2115  * so make one.
2116  */
2117 typedef struct thread_keys {
2118         void *key;
2119         void *data;
2120         ldap_pvt_thread_pool_keyfree_t *xfree;
2121 } thread_keys;
2122
2123 #define MAXKEYS 32
2124 /* A fake thread context */
2125 static thread_keys thrctx[MAXKEYS];
2126
2127 /* ITS#3456 we cannot run this search on the main thread, must use a
2128  * child thread in order to insure we have a big enough stack.
2129  */
2130 static void *
2131 syncprov_db_otask(
2132         void *ptr
2133 )
2134 {
2135         syncprov_findcsn( ptr, FIND_MAXCSN );
2136         return NULL;
2137 }
2138
2139 /* Read any existing contextCSN from the underlying db.
2140  * Then search for any entries newer than that. If no value exists,
2141  * just generate it. Cache whatever result.
2142  */
2143 static int
2144 syncprov_db_open(
2145     BackendDB *be
2146 )
2147 {
2148         slap_overinst   *on = (slap_overinst *) be->bd_info;
2149         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2150
2151         Connection conn;
2152         char opbuf[OPERATION_BUFFER_SIZE];
2153         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2154         Operation *op = (Operation *)opbuf;
2155         Entry *e;
2156         Attribute *a;
2157         int rc;
2158
2159         if ( slapMode & SLAP_TOOL_MODE ) {
2160                 return 0;
2161         }
2162
2163         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2164         if ( rc ) {
2165                 return rc;
2166         }
2167
2168         connection_fake_init( &conn, op, thrctx );
2169         op->o_bd = be;
2170         op->o_dn = be->be_rootdn;
2171         op->o_ndn = be->be_rootndn;
2172
2173         ctxcsnbuf[0] = '\0';
2174
2175         op->o_bd->bd_info = on->on_info->oi_orig;
2176         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2177                 slap_schema.si_ad_contextCSN, 0, &e );
2178
2179         if ( e ) {
2180                 ldap_pvt_thread_t tid;
2181
2182                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2183                 if ( a ) {
2184                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2185                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2186                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2187                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2188                                 si->si_ctxcsn.bv_len );
2189                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2190                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2191                 }
2192                 be_entry_release_rw( op, e, 0 );
2193                 op->o_bd->bd_info = (BackendInfo *)on;
2194                 op->o_req_dn = be->be_suffix[0];
2195                 op->o_req_ndn = be->be_nsuffix[0];
2196                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2197                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2198                 ldap_pvt_thread_join( tid, NULL );
2199         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2200                 /* If we're also a consumer, and we didn't find the context entry,
2201                  * then don't generate anything, wait for our provider to send it
2202                  * to us.
2203                  */
2204                 goto out;
2205         }
2206
2207         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2208                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2209                                 &si->si_ctxcsn, 0 );
2210         }
2211
2212         /* If our ctxcsn is different from what was read from the root
2213          * entry, make sure we do a checkpoint on close
2214          */
2215         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2216                 si->si_numops++;
2217         }
2218
2219 out:
2220         op->o_bd->bd_info = (BackendInfo *)on;
2221         return 0;
2222 }
2223
2224 /* Write the current contextCSN into the underlying db.
2225  */
2226 static int
2227 syncprov_db_close(
2228     BackendDB *be
2229 )
2230 {
2231     slap_overinst   *on = (slap_overinst *) be->bd_info;
2232     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2233         int i;
2234
2235         if ( slapMode & SLAP_TOOL_MODE ) {
2236                 return 0;
2237         }
2238         if ( si->si_numops ) {
2239                 Connection conn;
2240                 char opbuf[OPERATION_BUFFER_SIZE];
2241                 Operation *op = (Operation *)opbuf;
2242                 SlapReply rs = {REP_RESULT};
2243
2244                 connection_fake_init( &conn, op, thrctx );
2245                 op->o_bd = be;
2246                 op->o_dn = be->be_rootdn;
2247                 op->o_ndn = be->be_rootndn;
2248                 syncprov_checkpoint( op, &rs, on );
2249         }
2250         for ( i=0; thrctx[i].key; i++) {
2251                 if ( thrctx[i].xfree )
2252                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2253                 thrctx[i].key = NULL;
2254         }
2255
2256     return 0;
2257 }
2258
2259 static int
2260 syncprov_db_init(
2261         BackendDB *be
2262 )
2263 {
2264         slap_overinst   *on = (slap_overinst *)be->bd_info;
2265         syncprov_info_t *si;
2266
2267         si = ch_calloc(1, sizeof(syncprov_info_t));
2268         on->on_bi.bi_private = si;
2269         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2270         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2271         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2272         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2273
2274         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2275         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2276
2277         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2278         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2279
2280         return 0;
2281 }
2282
2283 static int
2284 syncprov_db_destroy(
2285         BackendDB *be
2286 )
2287 {
2288         slap_overinst   *on = (slap_overinst *)be->bd_info;
2289         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2290
2291         if ( si ) {
2292                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2293                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2294                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2295                 ch_free( si );
2296         }
2297
2298         return 0;
2299 }
2300
2301 static int syncprov_parseCtrl (
2302         Operation *op,
2303         SlapReply *rs,
2304         LDAPControl *ctrl )
2305 {
2306         ber_tag_t tag;
2307         BerElementBuffer berbuf;
2308         BerElement *ber = (BerElement *)&berbuf;
2309         ber_int_t mode;
2310         ber_len_t len;
2311         struct berval cookie = BER_BVNULL;
2312         sync_control *sr;
2313         int rhint = 0;
2314
2315         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2316                 rs->sr_text = "Sync control specified multiple times";
2317                 return LDAP_PROTOCOL_ERROR;
2318         }
2319
2320         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2321                 rs->sr_text = "Sync control specified with pagedResults control";
2322                 return LDAP_PROTOCOL_ERROR;
2323         }
2324
2325         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2326                 rs->sr_text = "Sync control value is empty (or absent)";
2327                 return LDAP_PROTOCOL_ERROR;
2328         }
2329
2330         /* Parse the control value
2331          *      syncRequestValue ::= SEQUENCE {
2332          *              mode   ENUMERATED {
2333          *                      -- 0 unused
2334          *                      refreshOnly             (1),
2335          *                      -- 2 reserved
2336          *                      refreshAndPersist       (3)
2337          *              },
2338          *              cookie  syncCookie OPTIONAL
2339          *      }
2340          */
2341
2342         ber_init2( ber, &ctrl->ldctl_value, 0 );
2343
2344         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2345                 rs->sr_text = "Sync control : mode decoding error";
2346                 return LDAP_PROTOCOL_ERROR;
2347         }
2348
2349         switch( mode ) {
2350         case LDAP_SYNC_REFRESH_ONLY:
2351                 mode = SLAP_SYNC_REFRESH;
2352                 break;
2353         case LDAP_SYNC_REFRESH_AND_PERSIST:
2354                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2355                 break;
2356         default:
2357                 rs->sr_text = "Sync control : unknown update mode";
2358                 return LDAP_PROTOCOL_ERROR;
2359         }
2360
2361         tag = ber_peek_tag( ber, &len );
2362
2363         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2364                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2365                         rs->sr_text = "Sync control : cookie decoding error";
2366                         return LDAP_PROTOCOL_ERROR;
2367                 }
2368         }
2369         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2370                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2371                         rs->sr_text = "Sync control : rhint decoding error";
2372                         return LDAP_PROTOCOL_ERROR;
2373                 }
2374         }
2375         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2376                         rs->sr_text = "Sync control : decoding error";
2377                         return LDAP_PROTOCOL_ERROR;
2378         }
2379         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2380         sr->sr_rhint = rhint;
2381         if (!BER_BVISNULL(&cookie)) {
2382                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2383                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2384                 if ( sr->sr_state.rid == -1 ) {
2385                         rs->sr_text = "Sync control : cookie parsing error";
2386                         return LDAP_PROTOCOL_ERROR;
2387                 }
2388         }
2389
2390         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2391
2392         op->o_sync = ctrl->ldctl_iscritical
2393                 ? SLAP_CONTROL_CRITICAL
2394                 : SLAP_CONTROL_NONCRITICAL;
2395
2396         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2397
2398         return LDAP_SUCCESS;
2399 }
2400
2401 /* This overlay is set up for dynamic loading via moduleload. For static
2402  * configuration, you'll need to arrange for the slap_overinst to be
2403  * initialized and registered by some other function inside slapd.
2404  */
2405
2406 static slap_overinst            syncprov;
2407
2408 int
2409 syncprov_init()
2410 {
2411         int rc;
2412
2413         rc = register_supported_control( LDAP_CONTROL_SYNC,
2414                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2415                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2416         if ( rc != LDAP_SUCCESS ) {
2417                 Debug( LDAP_DEBUG_ANY,
2418                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2419                 return rc;
2420         }
2421
2422         syncprov.on_bi.bi_type = "syncprov";
2423         syncprov.on_bi.bi_db_init = syncprov_db_init;
2424         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2425         syncprov.on_bi.bi_db_open = syncprov_db_open;
2426         syncprov.on_bi.bi_db_close = syncprov_db_close;
2427
2428         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2429         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2430
2431         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2432         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2433         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2434         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2435         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2436         syncprov.on_bi.bi_op_search = syncprov_op_search;
2437         syncprov.on_bi.bi_extended = syncprov_op_extended;
2438         syncprov.on_bi.bi_operational = syncprov_operational;
2439
2440         syncprov.on_bi.bi_cf_ocs = spocs;
2441
2442         rc = config_register_schema( spcfg, spocs );
2443         if ( rc ) return rc;
2444
2445         return overlay_register( &syncprov );
2446 }
2447
2448 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2449 int
2450 init_module( int argc, char *argv[] )
2451 {
2452         return syncprov_init();
2453 }
2454 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2455
2456 #endif /* defined(SLAPD_OVER_SYNCPROV) */