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 2004-2009 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 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         /* Use basic parameters from syncrepl search, but use
 397          * current op's threadctx / tmpmemctx
 398          */
 399         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 400         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 401                 slap_callback cb = {0};
 402                 Operation fop;
 403                 SlapReply frs = { REP_RESULT };
 404                 int rc;
 405
 406                 fc->fss->s_flags ^= PS_FIND_BASE;
 407                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 408
 409                 fop = *fc->fss->s_op;
 410
 411                 fop.o_bd = fop.o_bd->bd_self;
 412                 fop.o_hdr = op->o_hdr;
 413                 fop.o_time = op->o_time;
 414                 fop.o_tincr = op->o_tincr;
 415
 416                 cb.sc_response = findbase_cb;
 417                 cb.sc_private = fc;
 418
 419                 fop.o_sync_mode = 0;    /* turn off sync mode */
 420                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 421                 fop.o_callback = &cb;
 422                 fop.o_tag = LDAP_REQ_SEARCH;
 423                 fop.ors_scope = LDAP_SCOPE_BASE;
 424                 fop.ors_limit = NULL;
 425                 fop.ors_slimit = 1;
 426                 fop.ors_tlimit = SLAP_NO_LIMIT;
 427                 fop.ors_attrs = slap_anlist_no_attrs;
 428                 fop.ors_attrsonly = 1;
 429                 fop.ors_filter = &generic_filter;
 430                 fop.ors_filterstr = generic_filterstr;
 431
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433         } else {
 434                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 435                 fc->fbase = 1;
 436         }
 437
 438         /* After the first call, see if the fdn resides in the scope */
 439         if ( fc->fbase == 1 ) {
 440                 switch ( fc->fss->s_op->ors_scope ) {
 441                 case LDAP_SCOPE_BASE:
 442                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 443                         break;
 444                 case LDAP_SCOPE_ONELEVEL: {
 445                         struct berval pdn;
 446                         dnParent( fc->fdn, &pdn );
 447                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 448                         break; }
 449                 case LDAP_SCOPE_SUBTREE:
 450                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 451                         break;
 452                 case LDAP_SCOPE_SUBORDINATE:
 453                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 454                                 !dn_match( fc->fdn, &fc->fss->s_base );
 455                         break;
 456                 }
 457         }
 458
 459         if ( fc->fbase )
 460                 return LDAP_SUCCESS;
 461
 462         /* If entryID has changed, then the base of this search has
 463          * changed. Invalidate the psearch.
 464          */
 465         return LDAP_NO_SUCH_OBJECT;
 466 }
 467
 468 /* syncprov_findcsn:
 469  *   This function has three different purposes, but they all use a search
 470  * that filters on entryCSN so they're combined here.
 471  * 1: at startup time, after a contextCSN has been read from the database,
 472  * we search for all entries with CSN >= contextCSN in case the contextCSN
 473  * was not checkpointed at the previous shutdown.
 474  *
 475  * 2: when the current contextCSN is known and we have a sync cookie, we search
 476  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 477  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 478  *
 479  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 480  * CSN, and generate Present records for them. We always collect this result
 481  * in SyncID sets, even if there's only one match.
 482  */
 483 typedef enum find_csn_t {
 484         FIND_MAXCSN     = 1,
 485         FIND_CSN        = 2,
 486         FIND_PRESENT    = 3
 487 } find_csn_t;
 488
 489 static int
 490 findmax_cb( Operation *op, SlapReply *rs )
 491 {
 492         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 493                 struct berval *maxcsn = op->o_callback->sc_private;
 494                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 495                         slap_schema.si_ad_entryCSN );
 496
 497                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 498                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 499                         maxcsn->bv_len = a->a_vals[0].bv_len;
 500                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 501                 }
 502         }
 503         return LDAP_SUCCESS;
 504 }
 505
 506 static int
 507 findcsn_cb( Operation *op, SlapReply *rs )
 508 {
 509         slap_callback *sc = op->o_callback;
 510
 511         /* We just want to know that at least one exists, so it's OK if
 512          * we exceed the unchecked limit.
 513          */
 514         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 515                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 516                 sc->sc_private = (void *)1;
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 /* Build a list of entryUUIDs for sending in a SyncID set */
 522
 523 #define UUID_LEN        16
 524
 525 typedef struct fpres_cookie {
 526         int num;
 527         BerVarray uuids;
 528         char *last;
 529 } fpres_cookie;
 530
 531 static int
 532 findpres_cb( Operation *op, SlapReply *rs )
 533 {
 534         slap_callback *sc = op->o_callback;
 535         fpres_cookie *pc = sc->sc_private;
 536         Attribute *a;
 537         int ret = SLAP_CB_CONTINUE;
 538
 539         switch ( rs->sr_type ) {
 540         case REP_SEARCH:
 541                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 542                 if ( a ) {
 543                         pc->uuids[pc->num].bv_val = pc->last;
 544                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 545                                 pc->uuids[pc->num].bv_len );
 546                         pc->num++;
 547                         pc->last = pc->uuids[pc->num].bv_val;
 548                         pc->uuids[pc->num].bv_val = NULL;
 549                 }
 550                 ret = LDAP_SUCCESS;
 551                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 552                         break;
 553                 /* FALLTHRU */
 554         case REP_RESULT:
 555                 ret = rs->sr_err;
 556                 if ( pc->num ) {
 557                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 558                                 0, pc->uuids, 0 );
 559                         pc->uuids[pc->num].bv_val = pc->last;
 560                         pc->num = 0;
 561                         pc->last = pc->uuids[0].bv_val;
 562                 }
 563                 break;
 564         default:
 565                 break;
 566         }
 567         return ret;
 568 }
 569
 570 static int
 571 syncprov_findcsn( Operation *op, find_csn_t mode )
 572 {
 573         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 574         syncprov_info_t         *si = on->on_bi.bi_private;
 575
 576         slap_callback cb = {0};
 577         Operation fop;
 578         SlapReply frs = { REP_RESULT };
 579         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 580         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 581         struct berval maxcsn;
 582         Filter cf;
 583         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 584         fpres_cookie pcookie;
 585         sync_control *srs = NULL;
 586         struct slap_limits_set fc_limits;
 587         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 588         int maxid;
 589
 590         if ( mode != FIND_MAXCSN ) {
 591                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 592         }
 593
 594         fop = *op;
 595         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 596         /* We want pure entries, not referrals */
 597         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 598
 599         cf.f_ava = &eq;
 600         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 601         BER_BVZERO( &cf.f_av_value );
 602         cf.f_next = NULL;
 603
 604         fop.o_callback = &cb;
 605         fop.ors_limit = NULL;
 606         fop.ors_tlimit = SLAP_NO_LIMIT;
 607         fop.ors_filter = &cf;
 608         fop.ors_filterstr.bv_val = buf;
 609
 610 again:
 611         switch( mode ) {
 612         case FIND_MAXCSN:
 613                 cf.f_choice = LDAP_FILTER_GE;
 614                 /* If there are multiple CSNs, use the one with our serverID */
 615                 for ( i=0; i<si->si_numcsns; i++) {
 616                         if ( slap_serverID == si->si_sids[i] ) {
 617                                 maxid = i;
 618                                 break;
 619                         }
 620                 }
 621                 if ( i == si->si_numcsns ) {
 622                         /* No match: this is multimaster, and none of the content in the DB
 623                          * originated locally. Treat like no CSN.
 624                          */
 625                         return LDAP_NO_SUCH_OBJECT;
 626                 }
 627                 cf.f_av_value = si->si_ctxcsn[maxid];
 628                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 629                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 630                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 631                         return LDAP_OTHER;
 632                 }
 633                 fop.ors_attrsonly = 0;
 634                 fop.ors_attrs = csn_anlist;
 635                 fop.ors_slimit = SLAP_NO_LIMIT;
 636                 cb.sc_private = &maxcsn;
 637                 cb.sc_response = findmax_cb;
 638                 strcpy( cbuf, cf.f_av_value.bv_val );
 639                 maxcsn.bv_val = cbuf;
 640                 maxcsn.bv_len = cf.f_av_value.bv_len;
 641                 break;
 642         case FIND_CSN:
 643                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 644                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 645                         /* If there are multiple CSNs, use the smallest */
 646                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 647                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 648                                         > 0 ) {
 649                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 650                                 }
 651                         }
 652                 }
 653                 /* Look for exact match the first time */
 654                 if ( findcsn_retry ) {
 655                         cf.f_choice = LDAP_FILTER_EQUALITY;
 656                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 657                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 658                 /* On retry, look for <= */
 659                 } else {
 660                         cf.f_choice = LDAP_FILTER_LE;
 661                         fop.ors_limit = &fc_limits;
 662                         memset( &fc_limits, 0, sizeof( fc_limits ));
 663                         fc_limits.lms_s_unchecked = 1;
 664                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 665                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 666                 }
 667                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 668                         return LDAP_OTHER;
 669                 }
 670                 fop.ors_attrsonly = 1;
 671                 fop.ors_attrs = slap_anlist_no_attrs;
 672                 fop.ors_slimit = 1;
 673                 cb.sc_private = NULL;
 674                 cb.sc_response = findcsn_cb;
 675                 break;
 676         case FIND_PRESENT:
 677                 fop.ors_filter = op->ors_filter;
 678                 fop.ors_filterstr = op->ors_filterstr;
 679                 fop.ors_attrsonly = 0;
 680                 fop.ors_attrs = uuid_anlist;
 681                 fop.ors_slimit = SLAP_NO_LIMIT;
 682                 cb.sc_private = &pcookie;
 683                 cb.sc_response = findpres_cb;
 684                 pcookie.num = 0;
 685
 686                 /* preallocate storage for a full set */
 687                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 688                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 689                         op->o_tmpmemctx );
 690                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 691                 pcookie.uuids[0].bv_val = pcookie.last;
 692                 pcookie.uuids[0].bv_len = UUID_LEN;
 693                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 694                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 695                         pcookie.uuids[i].bv_len = UUID_LEN;
 696                 }
 697                 break;
 698         }
 699
 700         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 701         fop.o_bd->be_search( &fop, &frs );
 702         fop.o_bd->bd_info = (BackendInfo *)on;
 703
 704         switch( mode ) {
 705         case FIND_MAXCSN:
 706                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 707                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 708                         si->si_numops++;        /* ensure a checkpoint */
 709                 }
 710                 break;
 711         case FIND_CSN:
 712                 /* If matching CSN was not found, invalidate the context. */
 713                 if ( !cb.sc_private ) {
 714                         /* If we didn't find an exact match, then try for <= */
 715                         if ( findcsn_retry ) {
 716                                 findcsn_retry = 0;
 717                                 goto again;
 718                         }
 719                         rc = LDAP_NO_SUCH_OBJECT;
 720                 }
 721                 break;
 722         case FIND_PRESENT:
 723                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 724                 break;
 725         }
 726
 727         return rc;
 728 }
 729
 730 static void
 731 syncprov_free_syncop( syncops *so )
 732 {
 733         syncres *sr, *srnext;
 734         GroupAssertion *ga, *gnext;
 735
 736         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 737         if ( --so->s_inuse > 0 ) {
 738                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 739                 return;
 740         }
 741         if ( so->s_qtask ) {
 742                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 743                 if ( ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) )
 744                         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 745                 ldap_pvt_runqueue_remove( &slapd_rq, so->s_qtask );
 746                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 747         }
 748         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 749         if ( so->s_flags & PS_IS_DETACHED ) {
 750                 filter_free( so->s_op->ors_filter );
 751                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 752                         gnext = ga->ga_next;
 753                         ch_free( ga );
 754                 }
 755                 ch_free( so->s_op );
 756         }
 757         ch_free( so->s_base.bv_val );
 758         for ( sr=so->s_res; sr; sr=srnext ) {
 759                 srnext = sr->s_next;
 760                 ch_free( sr );
 761         }
 762         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 763         ch_free( so );
 764 }
 765
 766 /* Send a persistent search response */
 767 static int
 768 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 769         Entry **e, int mode )
 770 {
 771         slap_overinst *on = opc->son;
 772
 773         SlapReply rs = { REP_SEARCH };
 774         LDAPControl *ctrls[2];
 775         struct berval cookie, csns[2];
 776         Entry e_uuid = {0};
 777         Attribute a_uuid = {0};
 778
 779         if ( so->s_op->o_abandon )
 780                 return SLAPD_ABANDON;
 781
 782         ctrls[1] = NULL;
 783         csns[0] = opc->sctxcsn;
 784         BER_BVZERO( &csns[1] );
 785         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 786
 787         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 788
 789         e_uuid.e_attrs = &a_uuid;
 790         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 791         a_uuid.a_nvals = &opc->suuid;
 792         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 793                 mode, ctrls, 0, 1, &cookie );
 794         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 795
 796         rs.sr_ctrls = ctrls;
 797         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 798         switch( mode ) {
 799         case LDAP_SYNC_ADD:
 800                 rs.sr_entry = *e;
 801                 if ( rs.sr_entry->e_private )
 802                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 803                 if ( opc->sreference ) {
 804                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 805                         rs.sr_err = send_search_reference( op, &rs );
 806                         ber_bvarray_free( rs.sr_ref );
 807                         if ( !rs.sr_entry )
 808                                 *e = NULL;
 809                         break;
 810                 }
 811                 /* fallthru */
 812         case LDAP_SYNC_MODIFY:
 813                 rs.sr_entry = *e;
 814                 if ( rs.sr_entry->e_private )
 815                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 816                 rs.sr_attrs = op->ors_attrs;
 817                 rs.sr_err = send_search_entry( op, &rs );
 818                 if ( !rs.sr_entry )
 819                         *e = NULL;
 820                 break;
 821         case LDAP_SYNC_DELETE:
 822                 e_uuid.e_attrs = NULL;
 823                 e_uuid.e_name = opc->sdn;
 824                 e_uuid.e_nname = opc->sndn;
 825                 rs.sr_entry = &e_uuid;
 826                 if ( opc->sreference ) {
 827                         struct berval bv = BER_BVNULL;
 828                         rs.sr_ref = &bv;
 829                         rs.sr_err = send_search_reference( op, &rs );
 830                 } else {
 831                         rs.sr_err = send_search_entry( op, &rs );
 832                 }
 833                 break;
 834         default:
 835                 assert(0);
 836         }
 837         /* In case someone else freed it already? */
 838         if ( rs.sr_ctrls ) {
 839                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 840                 rs.sr_ctrls = NULL;
 841         }
 842
 843         return rs.sr_err;
 844 }
 845
 846 /* Play back queued responses */
 847 static int
 848 syncprov_qplay( Operation *op, struct re_s *rtask )
 849 {
 850         syncops *so = rtask->arg;
 851         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 852         syncres *sr;
 853         Entry *e;
 854         opcookie opc;
 855         int rc = 0;
 856
 857         opc.son = on;
 858
 859         for (;;) {
 860                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 861                 sr = so->s_res;
 862                 if ( sr )
 863                         so->s_res = sr->s_next;
 864                 if ( !so->s_res )
 865                         so->s_restail = NULL;
 866                 /* Exit loop with mutex held */
 867                 if ( !sr || so->s_op->o_abandon )
 868                         break;
 869                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 870
 871                 opc.sdn = sr->s_dn;
 872                 opc.sndn = sr->s_ndn;
 873                 opc.suuid = sr->s_uuid;
 874                 opc.sctxcsn = sr->s_csn;
 875                 opc.sreference = sr->s_isreference;
 876                 e = NULL;
 877
 878                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 879                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 880                         if ( rc ) {
 881                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 882                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 883                                 ch_free( sr );
 884                                 rc = 0;
 885                                 continue;
 886                         }
 887                 }
 888                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 889
 890                 if ( e ) {
 891                         overlay_entry_release_ov( op, e, 0, on );
 892                 }
 893
 894                 ch_free( sr );
 895
 896                 if ( rc ) {
 897                         /* Exit loop with mutex held */
 898                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 899                         break;
 900                 }
 901         }
 902
 903         /* wait until we get explicitly scheduled again */
 904         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 905         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 906         if ( rc == 0 ) {
 907                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 908         } else {
 909                 /* bail out on any error */
 910                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 911
 912                 /* Prevent duplicate remove */
 913                 if ( so->s_qtask == rtask )
 914                         so->s_qtask = NULL;
 915         }
 916         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 917         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 918         return rc;
 919 }
 920
 921 /* runqueue task for playing back queued responses */
 922 static void *
 923 syncprov_qtask( void *ctx, void *arg )
 924 {
 925         struct re_s *rtask = arg;
 926         syncops *so = rtask->arg;
 927         OperationBuffer opbuf;
 928         Operation *op;
 929         BackendDB be;
 930         int rc;
 931
 932         op = &opbuf.ob_op;
 933         *op = *so->s_op;
 934         op->o_hdr = &opbuf.ob_hdr;
 935         op->o_controls = opbuf.ob_controls;
 936         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 937
 938         *op->o_hdr = *so->s_op->o_hdr;
 939
 940         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 941         op->o_tmpmfuncs = &slap_sl_mfuncs;
 942         op->o_threadctx = ctx;
 943
 944         /* syncprov_qplay expects a fake db */
 945         be = *so->s_op->o_bd;
 946         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 947         op->o_bd = &be;
 948         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 949         op->o_callback = NULL;
 950
 951         rc = syncprov_qplay( op, rtask );
 952
 953         /* decrement use count... */
 954         syncprov_free_syncop( so );
 955
 956 #if 0   /* FIXME: connection_close isn't exported from slapd.
 957                  * should it be?
 958                  */
 959         if ( rc ) {
 960                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 961                 if ( connection_state_closing( op->o_conn )) {
 962                         connection_close( op->o_conn );
 963                 }
 964                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 965         }
 966 #endif
 967         return NULL;
 968 }
 969
 970 /* Start the task to play back queued psearch responses */
 971 static void
 972 syncprov_qstart( syncops *so )
 973 {
 974         int wake=0;
 975         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 976         if ( !so->s_qtask ) {
 977                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 978                         syncprov_qtask, so, "syncprov_qtask",
 979                         so->s_op->o_conn->c_peer_name.bv_val );
 980                 ++so->s_inuse;
 981                 wake = 1;
 982         } else {
 983                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 984                         !so->s_qtask->next_sched.tv_sec ) {
 985                         so->s_qtask->interval.tv_sec = 0;
 986                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 987                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 988                         ++so->s_inuse;
 989                         wake = 1;
 990                 }
 991         }
 992         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 993         if ( wake )
 994                 slap_wake_listener();
 995 }
 996
 997 /* Queue a persistent search response */
 998 static int
 999 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1000 {
1001         syncres *sr;
1002         int sid, srsize;
1003
1004         /* Don't send changes back to their originator */
1005         sid = slap_parse_csn_sid( &opc->sctxcsn );
1006         if ( sid >= 0 && sid == so->s_sid )
1007                 return LDAP_SUCCESS;
1008
1009         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1010                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1011         if ( opc->sctxcsn.bv_len )
1012                 srsize += opc->sctxcsn.bv_len + 1;
1013         sr = ch_malloc( srsize );
1014         sr->s_next = NULL;
1015         sr->s_dn.bv_val = (char *)(sr + 1);
1016         sr->s_dn.bv_len = opc->sdn.bv_len;
1017         sr->s_mode = mode;
1018         sr->s_isreference = opc->sreference;
1019         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1020                  opc->sdn.bv_val ) + 1;
1021         sr->s_ndn.bv_len = opc->sndn.bv_len;
1022         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1023                  opc->sndn.bv_val ) + 1;
1024         sr->s_uuid.bv_len = opc->suuid.bv_len;
1025         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1026         if ( opc->sctxcsn.bv_len ) {
1027                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1028                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1029         } else {
1030                 sr->s_csn.bv_val = NULL;
1031         }
1032         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1033
1034         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1035         if ( !so->s_res ) {
1036                 so->s_res = sr;
1037         } else {
1038                 so->s_restail->s_next = sr;
1039         }
1040         so->s_restail = sr;
1041
1042         /* If the base of the psearch was modified, check it next time round */
1043         if ( so->s_flags & PS_WROTE_BASE ) {
1044                 so->s_flags ^= PS_WROTE_BASE;
1045                 so->s_flags |= PS_FIND_BASE;
1046         }
1047         if ( so->s_flags & PS_IS_DETACHED ) {
1048                 syncprov_qstart( so );
1049         }
1050         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1051         return LDAP_SUCCESS;
1052 }
1053
1054 static int
1055 syncprov_drop_psearch( syncops *so, int lock )
1056 {
1057         if ( so->s_flags & PS_IS_DETACHED ) {
1058                 if ( lock )
1059                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1060                 so->s_op->o_conn->c_n_ops_executing--;
1061                 so->s_op->o_conn->c_n_ops_completed++;
1062                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1063                         o_next );
1064                 if ( lock )
1065                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1066         }
1067         syncprov_free_syncop( so );
1068
1069         return 0;
1070 }
1071
1072 static int
1073 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1074 {
1075         slap_callback *sc = op->o_callback;
1076         op->o_callback = sc->sc_next;
1077         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1078         op->o_tmpfree( sc, op->o_tmpmemctx );
1079         return 0;
1080 }
1081
1082 static int
1083 syncprov_op_abandon( Operation *op, SlapReply *rs )
1084 {
1085         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1086         syncprov_info_t         *si = on->on_bi.bi_private;
1087         syncops *so, *soprev;
1088
1089         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1090         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1091                 soprev=so, so=so->s_next ) {
1092                 if ( so->s_op->o_connid == op->o_connid &&
1093                         so->s_op->o_msgid == op->orn_msgid ) {
1094                                 so->s_op->o_abandon = 1;
1095                                 soprev->s_next = so->s_next;
1096                                 break;
1097                 }
1098         }
1099         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1100         if ( so ) {
1101                 /* Is this really a Cancel exop? */
1102                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1103                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1104                         rs->sr_err = LDAP_CANCELLED;
1105                         send_ldap_result( so->s_op, rs );
1106                         if ( so->s_flags & PS_IS_DETACHED ) {
1107                                 slap_callback *cb;
1108                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1109                                 cb->sc_cleanup = syncprov_ab_cleanup;
1110                                 cb->sc_next = op->o_callback;
1111                                 cb->sc_private = so;
1112                                 return SLAP_CB_CONTINUE;
1113                         }
1114                 }
1115                 syncprov_drop_psearch( so, 0 );
1116         }
1117         return SLAP_CB_CONTINUE;
1118 }
1119
1120 /* Find which persistent searches are affected by this operation */
1121 static void
1122 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1123 {
1124         slap_overinst *on = opc->son;
1125         syncprov_info_t         *si = on->on_bi.bi_private;
1126
1127         fbase_cookie fc;
1128         syncops *ss, *sprev, *snext;
1129         Entry *e = NULL;
1130         Attribute *a;
1131         int rc;
1132         struct berval newdn;
1133         int freefdn = 0;
1134         BackendDB *b0 = op->o_bd, db;
1135
1136         fc.fdn = &op->o_req_ndn;
1137         /* compute new DN */
1138         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1139                 struct berval pdn;
1140                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1141                 else dnParent( fc.fdn, &pdn );
1142                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1143                 fc.fdn = &newdn;
1144                 freefdn = 1;
1145         }
1146         if ( op->o_tag != LDAP_REQ_ADD ) {
1147                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1148                         db = *op->o_bd;
1149                         op->o_bd = &db;
1150                 }
1151                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1152                 /* If we're sending responses now, make a copy and unlock the DB */
1153                 if ( e && !saveit ) {
1154                         Entry *e2 = entry_dup( e );
1155                         overlay_entry_release_ov( op, e, 0, on );
1156                         e = e2;
1157                 }
1158                 if ( rc ) {
1159                         op->o_bd = b0;
1160                         return;
1161                 }
1162         } else {
1163                 e = op->ora_e;
1164         }
1165
1166         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1167                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1168                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1169                 opc->sreference = is_entry_referral( e );
1170                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1171                 if ( a )
1172                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1173         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1174                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1175                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1176                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1177                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1178         }
1179
1180         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1181         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1182                 sprev = ss, ss=snext)
1183         {
1184                 Operation op2;
1185                 Opheader oh;
1186                 syncmatches *sm;
1187                 int found = 0;
1188
1189                 snext = ss->s_next;
1190                 if ( ss->s_op->o_abandon )
1191                         continue;
1192
1193                 /* validate base */
1194                 fc.fss = ss;
1195                 fc.fbase = 0;
1196                 fc.fscope = 0;
1197
1198                 /* If the base of the search is missing, signal a refresh */
1199                 rc = syncprov_findbase( op, &fc );
1200                 if ( rc != LDAP_SUCCESS ) {
1201                         SlapReply rs = {REP_RESULT};
1202                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1203                                 "search base has changed" );
1204                         sprev->s_next = snext;
1205                         syncprov_drop_psearch( ss, 1 );
1206                         ss = sprev;
1207                         continue;
1208                 }
1209
1210
1211                 /* If we're sending results now, look for this op in old matches */
1212                 if ( !saveit ) {
1213                         syncmatches *old;
1214
1215                         /* Did we modify the search base? */
1216                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1217                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1218                                 ss->s_flags |= PS_WROTE_BASE;
1219                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1220                         }
1221
1222                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1223                                 old=sm, sm=sm->sm_next ) {
1224                                 if ( sm->sm_op == ss ) {
1225                                         found = 1;
1226                                         old->sm_next = sm->sm_next;
1227                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1228                                         break;
1229                                 }
1230                         }
1231                 }
1232
1233                 if ( fc.fscope ) {
1234                         op2 = *ss->s_op;
1235                         oh = *op->o_hdr;
1236                         oh.oh_conn = ss->s_op->o_conn;
1237                         oh.oh_connid = ss->s_op->o_connid;
1238                         op2.o_hdr = &oh;
1239                         op2.o_extra = op->o_extra;
1240                 }
1241
1242                 /* check if current o_req_dn is in scope and matches filter */
1243                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1244                         LDAP_COMPARE_TRUE ) {
1245                         if ( saveit ) {
1246                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1247                                 sm->sm_next = opc->smatches;
1248                                 sm->sm_op = ss;
1249                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1250                                 ++ss->s_inuse;
1251                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1252                                 opc->smatches = sm;
1253                         } else {
1254                                 /* if found send UPDATE else send ADD */
1255                                 syncprov_qresp( opc, ss,
1256                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1257                         }
1258                 } else if ( !saveit && found ) {
1259                         /* send DELETE */
1260                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1261                 }
1262                 if ( !saveit && found ) {
1263                         /* Decrement s_inuse, was incremented when called
1264                          * with saveit == TRUE
1265                          */
1266                         syncprov_free_syncop( ss );
1267                 }
1268         }
1269         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1270
1271         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1272                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1273                         op->o_bd = &db;
1274                 }
1275                 overlay_entry_release_ov( op, e, 0, on );
1276                 op->o_bd = b0;
1277         }
1278         if ( freefdn ) {
1279                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1280         }
1281         op->o_bd = b0;
1282 }
1283
1284 static int
1285 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1286 {
1287         slap_callback *cb = op->o_callback;
1288         opcookie *opc = cb->sc_private;
1289         slap_overinst *on = opc->son;
1290         syncprov_info_t         *si = on->on_bi.bi_private;
1291         syncmatches *sm, *snext;
1292         modtarget *mt, mtdummy;
1293
1294         for (sm = opc->smatches; sm; sm=snext) {
1295                 snext = sm->sm_next;
1296                 syncprov_free_syncop( sm->sm_op );
1297                 op->o_tmpfree( sm, op->o_tmpmemctx );
1298         }
1299
1300         /* Remove op from lock table */
1301         mtdummy.mt_op = op;
1302         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1303         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1304         if ( mt ) {
1305                 modinst *mi = mt->mt_mods;
1306
1307                 /* If there are more, promote the next one */
1308                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1309                 if ( mi->mi_next ) {
1310                         mt->mt_mods = mi->mi_next;
1311                         mt->mt_op = mt->mt_mods->mi_op;
1312                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1313                 } else {
1314                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1315                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1316                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1317                         ch_free( mt );
1318                 }
1319         }
1320         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1321         if ( !BER_BVISNULL( &opc->suuid ))
1322                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1323         if ( !BER_BVISNULL( &opc->sndn ))
1324                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1325         if ( !BER_BVISNULL( &opc->sdn ))
1326                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1327         op->o_callback = cb->sc_next;
1328         op->o_tmpfree(cb, op->o_tmpmemctx);
1329
1330         return 0;
1331 }
1332
1333 static void
1334 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1335 {
1336         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1337         Modifications mod;
1338         Operation opm;
1339         SlapReply rsm = { 0 };
1340         slap_callback cb = {0};
1341         BackendDB be;
1342
1343         mod.sml_numvals = si->si_numcsns;
1344         mod.sml_values = si->si_ctxcsn;
1345         mod.sml_nvalues = NULL;
1346         mod.sml_desc = slap_schema.si_ad_contextCSN;
1347         mod.sml_op = LDAP_MOD_REPLACE;
1348         mod.sml_flags = SLAP_MOD_INTERNAL;
1349         mod.sml_next = NULL;
1350
1351         cb.sc_response = slap_null_cb;
1352         opm = *op;
1353         opm.o_tag = LDAP_REQ_MODIFY;
1354         opm.o_callback = &cb;
1355         opm.orm_modlist = &mod;
1356         opm.orm_no_opattrs = 1;
1357         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1358                 be = *on->on_info->oi_origdb;
1359                 opm.o_bd = &be;
1360         }
1361         opm.o_req_dn = opm.o_bd->be_suffix[0];
1362         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1363         opm.o_bd->bd_info = on->on_info->oi_orig;
1364         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1365         opm.o_no_schema_check = 1;
1366         opm.o_bd->be_modify( &opm, &rsm );
1367         if ( mod.sml_next != NULL ) {
1368                 slap_mods_free( mod.sml_next, 1 );
1369         }
1370 }
1371
1372 static void
1373 syncprov_add_slog( Operation *op )
1374 {
1375         opcookie *opc = op->o_callback->sc_private;
1376         slap_overinst *on = opc->son;
1377         syncprov_info_t         *si = on->on_bi.bi_private;
1378         sessionlog *sl;
1379         slog_entry *se;
1380
1381         sl = si->si_logs;
1382         {
1383                 /* Allocate a record. UUIDs are not NUL-terminated. */
1384                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1385                         op->o_csn.bv_len + 1 );
1386                 se->se_next = NULL;
1387                 se->se_tag = op->o_tag;
1388
1389                 se->se_uuid.bv_val = (char *)(&se[1]);
1390                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1391                 se->se_uuid.bv_len = opc->suuid.bv_len;
1392
1393                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1394                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1395                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1396                 se->se_csn.bv_len = op->o_csn.bv_len;
1397                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1398
1399                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1400                 if ( sl->sl_head ) {
1401                         sl->sl_tail->se_next = se;
1402                 } else {
1403                         sl->sl_head = se;
1404                 }
1405                 sl->sl_tail = se;
1406                 sl->sl_num++;
1407                 while ( sl->sl_num > sl->sl_size ) {
1408                         se = sl->sl_head;
1409                         sl->sl_head = se->se_next;
1410                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1411                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1412                         ch_free( se );
1413                         sl->sl_num--;
1414                 }
1415                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1416         }
1417 }
1418
1419 /* Just set a flag if we found the matching entry */
1420 static int
1421 playlog_cb( Operation *op, SlapReply *rs )
1422 {
1423         if ( rs->sr_type == REP_SEARCH ) {
1424                 op->o_callback->sc_private = (void *)1;
1425         }
1426         return rs->sr_err;
1427 }
1428
1429 /* enter with sl->sl_mutex locked, release before returning */
1430 static void
1431 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1432         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1433 {
1434         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1435         slog_entry *se;
1436         int i, j, ndel, num, nmods, mmods;
1437         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1438         BerVarray uuids;
1439         struct berval delcsn[2];
1440
1441         if ( !sl->sl_num ) {
1442                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1443                 return;
1444         }
1445
1446         num = sl->sl_num;
1447         i = 0;
1448         nmods = 0;
1449
1450         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1451                 num * UUID_LEN, op->o_tmpmemctx );
1452         uuids[0].bv_val = (char *)(uuids + num + 1);
1453
1454         delcsn[0].bv_len = 0;
1455         delcsn[0].bv_val = cbuf;
1456         BER_BVZERO(&delcsn[1]);
1457
1458         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1459          * and everything else at the end. Do this first so we can
1460          * unlock the list mutex.
1461          */
1462         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1463                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1464         for ( se=sl->sl_head; se; se=se->se_next ) {
1465                 int k;
1466                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1467                 ndel = 1;
1468                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1469                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1470                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1471                                 break;
1472                         }
1473                 }
1474                 if ( ndel <= 0 ) {
1475                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1476                         continue;
1477                 }
1478                 ndel = 0;
1479                 for ( k=0; k<numcsns; k++ ) {
1480                         if ( se->se_sid == sids[k] ) {
1481                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1482                                 break;
1483                         }
1484                 }
1485                 if ( ndel > 0 ) {
1486                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1487                         break;
1488                 }
1489                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1490                         j = i;
1491                         i++;
1492                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1493                         delcsn[0].bv_len = se->se_csn.bv_len;
1494                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1495                 } else {
1496                         nmods++;
1497                         j = num - nmods;
1498                 }
1499                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1500                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1501                 uuids[j].bv_len = UUID_LEN;
1502         }
1503         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1504
1505         ndel = i;
1506
1507         /* Zero out unused slots */
1508         for ( i=ndel; i < num - nmods; i++ )
1509                 uuids[i].bv_len = 0;
1510
1511         /* Mods must be validated to see if they belong in this delete set.
1512          */
1513
1514         mmods = nmods;
1515         /* Strip any duplicates */
1516         for ( i=0; i<nmods; i++ ) {
1517                 for ( j=0; j<ndel; j++ ) {
1518                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1519                                 uuids[num - 1 - i].bv_len = 0;
1520                                 mmods --;
1521                                 break;
1522                         }
1523                 }
1524                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1525                 for ( j=0; j<i; j++ ) {
1526                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1527                                 uuids[num - 1 - i].bv_len = 0;
1528                                 mmods --;
1529                                 break;
1530                         }
1531                 }
1532         }
1533
1534         if ( mmods ) {
1535                 Operation fop;
1536                 SlapReply frs = { REP_RESULT };
1537                 int rc;
1538                 Filter mf, af;
1539                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1540                 slap_callback cb = {0};
1541
1542                 fop = *op;
1543
1544                 fop.o_sync_mode = 0;
1545                 fop.o_callback = &cb;
1546                 fop.ors_limit = NULL;
1547                 fop.ors_tlimit = SLAP_NO_LIMIT;
1548                 fop.ors_attrs = slap_anlist_all_attributes;
1549                 fop.ors_attrsonly = 0;
1550                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1551
1552                 af.f_choice = LDAP_FILTER_AND;
1553                 af.f_next = NULL;
1554                 af.f_and = &mf;
1555                 mf.f_choice = LDAP_FILTER_EQUALITY;
1556                 mf.f_ava = &eq;
1557                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1558                 mf.f_next = fop.ors_filter;
1559
1560                 fop.ors_filter = &af;
1561
1562                 cb.sc_response = playlog_cb;
1563                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1564
1565                 for ( i=ndel; i<num; i++ ) {
1566                         if ( uuids[i].bv_len == 0 ) continue;
1567
1568                         mf.f_av_value = uuids[i];
1569                         cb.sc_private = NULL;
1570                         fop.ors_slimit = 1;
1571                         frs.sr_nentries = 0;
1572                         rc = fop.o_bd->be_search( &fop, &frs );
1573
1574                         /* If entry was not found, add to delete list */
1575                         if ( !cb.sc_private ) {
1576                                 uuids[ndel++] = uuids[i];
1577                         }
1578                 }
1579                 fop.o_bd->bd_info = (BackendInfo *)on;
1580         }
1581         if ( ndel ) {
1582                 struct berval cookie;
1583
1584                 if ( delcsn[0].bv_len ) {
1585                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1586                                 srs->sr_state.sid );
1587
1588                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1589                 }
1590
1591                 uuids[ndel].bv_val = NULL;
1592                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1593                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1594                 if ( delcsn[0].bv_len ) {
1595                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1596                 }
1597         }
1598         op->o_tmpfree( uuids, op->o_tmpmemctx );
1599 }
1600
1601 static int
1602 syncprov_op_response( Operation *op, SlapReply *rs )
1603 {
1604         opcookie *opc = op->o_callback->sc_private;
1605         slap_overinst *on = opc->son;
1606         syncprov_info_t         *si = on->on_bi.bi_private;
1607         syncmatches *sm;
1608
1609         if ( rs->sr_err == LDAP_SUCCESS )
1610         {
1611                 struct berval maxcsn = BER_BVNULL;
1612                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1613                 int do_check = 0, have_psearches, foundit;
1614
1615                 /* Update our context CSN */
1616                 cbuf[0] = '\0';
1617                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1618                 slap_get_commit_csn( op, &maxcsn, &foundit );
1619                 if ( BER_BVISNULL( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1620                         /* syncrepl queues the CSN values in the db where
1621                          * it is configured , not where the changes are made.
1622                          * So look for a value in the glue db if we didn't
1623                          * find any in this db.
1624                          */
1625                         BackendDB *be = op->o_bd;
1626                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1627                         slap_get_commit_csn( op, &maxcsn, &foundit );
1628                         op->o_bd = be;
1629                 }
1630                 if ( !BER_BVISNULL( &maxcsn ) ) {
1631                         int i, sid;
1632                         strcpy( cbuf, maxcsn.bv_val );
1633                         sid = slap_parse_csn_sid( &maxcsn );
1634                         for ( i=0; i<si->si_numcsns; i++ ) {
1635                                 if ( sid == si->si_sids[i] ) {
1636                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1637                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1638                                         }
1639                                         break;
1640                                 }
1641                         }
1642                         /* It's a new SID for us */
1643                         if ( i == si->si_numcsns ) {
1644                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1645                                 si->si_numcsns++;
1646                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1647                                         sizeof(int));
1648                                 si->si_sids[i] = sid;
1649                         }
1650                 } else if ( !foundit ) {
1651                         /* internal ops that aren't meant to be replicated */
1652                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1653                         return SLAP_CB_CONTINUE;
1654                 }
1655
1656                 /* Don't do any processing for consumer contextCSN updates */
1657                 if ( op->o_dont_replicate ) {
1658                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1659                         return SLAP_CB_CONTINUE;
1660                 }
1661
1662                 si->si_numops++;
1663                 if ( si->si_chkops || si->si_chktime ) {
1664                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1665                                 do_check = 1;
1666                                 si->si_numops = 0;
1667                         }
1668                         if ( si->si_chktime &&
1669                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1670                                 if ( si->si_chklast ) {
1671                                         do_check = 1;
1672                                         si->si_chklast = op->o_time;
1673                                 } else {
1674                                         si->si_chklast = 1;
1675                                 }
1676                         }
1677                 }
1678                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1679
1680                 if ( do_check ) {
1681                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1682                         syncprov_checkpoint( op, rs, on );
1683                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1684                 }
1685
1686                 /* only update consumer ctx if this is the greatest csn */
1687                 if ( bvmatch( &maxcsn, &op->o_csn )) {
1688                         opc->sctxcsn.bv_len = maxcsn.bv_len;
1689                         opc->sctxcsn.bv_val = cbuf;
1690                 }
1691
1692                 /* Handle any persistent searches */
1693                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1694                 have_psearches = ( si->si_ops != NULL );
1695                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1696                 if ( have_psearches ) {
1697                         switch(op->o_tag) {
1698                         case LDAP_REQ_ADD:
1699                         case LDAP_REQ_MODIFY:
1700                         case LDAP_REQ_MODRDN:
1701                         case LDAP_REQ_EXTENDED:
1702                                 syncprov_matchops( op, opc, 0 );
1703                                 break;
1704                         case LDAP_REQ_DELETE:
1705                                 /* for each match in opc->smatches:
1706                                  *   send DELETE msg
1707                                  */
1708                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1709                                         if ( sm->sm_op->s_op->o_abandon )
1710                                                 continue;
1711                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1712                                 }
1713                                 break;
1714                         }
1715                 }
1716
1717                 /* Add any log records */
1718                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1719                         syncprov_add_slog( op );
1720                 }
1721
1722         }
1723         return SLAP_CB_CONTINUE;
1724 }
1725
1726 /* We don't use a subentry to store the context CSN any more.
1727  * We expose the current context CSN as an operational attribute
1728  * of the suffix entry.
1729  */
1730 static int
1731 syncprov_op_compare( Operation *op, SlapReply *rs )
1732 {
1733         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1734         syncprov_info_t         *si = on->on_bi.bi_private;
1735         int rc = SLAP_CB_CONTINUE;
1736
1737         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1738                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1739         {
1740                 Entry e = {0};
1741                 Attribute a = {0};
1742
1743                 e.e_name = op->o_bd->be_suffix[0];
1744                 e.e_nname = op->o_bd->be_nsuffix[0];
1745                 e.e_attrs = &a;
1746
1747                 a.a_desc = slap_schema.si_ad_contextCSN;
1748
1749                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1750
1751                 a.a_vals = si->si_ctxcsn;
1752                 a.a_nvals = a.a_vals;
1753
1754                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1755                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1756                 if ( ! rs->sr_err ) {
1757                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1758                         goto return_results;
1759                 }
1760
1761                 if ( get_assert( op ) &&
1762                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1763                 {
1764                         rs->sr_err = LDAP_ASSERTION_FAILED;
1765                         goto return_results;
1766                 }
1767
1768
1769                 rs->sr_err = LDAP_COMPARE_FALSE;
1770
1771                 if ( attr_valfind( &a,
1772                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1773                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1774                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1775                 {
1776                         rs->sr_err = LDAP_COMPARE_TRUE;
1777                 }
1778
1779 return_results:;
1780
1781                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1782
1783                 send_ldap_result( op, rs );
1784
1785                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1786                         rs->sr_err = LDAP_SUCCESS;
1787                 }
1788                 rc = rs->sr_err;
1789         }
1790
1791         return rc;
1792 }
1793
1794 static int
1795 syncprov_op_mod( Operation *op, SlapReply *rs )
1796 {
1797         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1798         syncprov_info_t         *si = on->on_bi.bi_private;
1799         slap_callback *cb;
1800         opcookie *opc;
1801         int have_psearches, cbsize;
1802
1803         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1804         have_psearches = ( si->si_ops != NULL );
1805         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1806
1807         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1808                 (have_psearches ? sizeof(modinst) : 0 );
1809
1810         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1811         opc = (opcookie *)(cb+1);
1812         opc->son = on;
1813         cb->sc_response = syncprov_op_response;
1814         cb->sc_cleanup = syncprov_op_cleanup;
1815         cb->sc_private = opc;
1816         cb->sc_next = op->o_callback;
1817         op->o_callback = cb;
1818
1819         /* If there are active persistent searches, lock this operation.
1820          * See seqmod.c for the locking logic on its own.
1821          */
1822         if ( have_psearches ) {
1823                 modtarget *mt, mtdummy;
1824                 modinst *mi;
1825
1826                 mi = (modinst *)(opc+1);
1827                 mi->mi_op = op;
1828
1829                 /* See if we're already modifying this entry... */
1830                 mtdummy.mt_op = op;
1831                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1832                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1833                 if ( mt ) {
1834                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1835                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1836                         mt->mt_tail->mi_next = mi;
1837                         mt->mt_tail = mi;
1838                         /* wait for this op to get to head of list */
1839                         while ( mt->mt_mods != mi ) {
1840                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1841                                 /* FIXME: if dynamic config can delete overlays or
1842                                  * databases we'll have to check for cleanup here.
1843                                  * Currently it's not an issue because there are
1844                                  * no dynamic config deletes...
1845                                  */
1846                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1847                                         ldap_pvt_thread_yield();
1848                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1849
1850                                 /* clean up if the caller is giving up */
1851                                 if ( op->o_abandon ) {
1852                                         modinst *m2;
1853                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1854                                                 m2 = m2->mi_next );
1855                                         m2->mi_next = mi->mi_next;
1856                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1857                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1858                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1859                                         return SLAPD_ABANDON;
1860                                 }
1861                         }
1862                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1863                 } else {
1864                         /* Record that we're modifying this entry now */
1865                         mt = ch_malloc( sizeof(modtarget) );
1866                         mt->mt_mods = mi;
1867                         mt->mt_tail = mi;
1868                         mt->mt_op = mi->mi_op;
1869                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1870                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1871                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1872                 }
1873         }
1874
1875         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1876                 syncprov_matchops( op, opc, 1 );
1877
1878         return SLAP_CB_CONTINUE;
1879 }
1880
1881 static int
1882 syncprov_op_extended( Operation *op, SlapReply *rs )
1883 {
1884         if ( exop_is_write( op ))
1885                 return syncprov_op_mod( op, rs );
1886
1887         return SLAP_CB_CONTINUE;
1888 }
1889
1890 typedef struct searchstate {
1891         slap_overinst *ss_on;
1892         syncops *ss_so;
1893         BerVarray ss_ctxcsn;
1894         int *ss_sids;
1895         int ss_numcsns;
1896 #define SS_PRESENT      0x01
1897 #define SS_CHANGED      0x02
1898         int ss_flags;
1899 } searchstate;
1900
1901 static int
1902 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1903 {
1904         if ( rs->sr_ctrls ) {
1905                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1906                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1907                 rs->sr_ctrls = NULL;
1908         }
1909         return 0;
1910 }
1911
1912 typedef struct SyncOperationBuffer {
1913         Operation               sob_op;
1914         Opheader                sob_hdr;
1915         OpExtra                 sob_oe;
1916         AttributeName   sob_extra;      /* not always present */
1917         /* Further data allocated here */
1918 } SyncOperationBuffer;
1919
1920 static void
1921 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1922 {
1923         SyncOperationBuffer *sopbuf2;
1924         Operation *op2;
1925         int i, alen = 0;
1926         size_t size;
1927         char *ptr;
1928         GroupAssertion *g1, *g2;
1929
1930         /* count the search attrs */
1931         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1932                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1933         }
1934         /* Make a new copy of the operation */
1935         size = offsetof( SyncOperationBuffer, sob_extra ) +
1936                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1937                 op->o_req_dn.bv_len + 1 +
1938                 op->o_req_ndn.bv_len + 1 +
1939                 op->o_ndn.bv_len + 1 +
1940                 so->s_filterstr.bv_len + 1;
1941         sopbuf2 = ch_calloc( 1, size );
1942         op2 = &sopbuf2->sob_op;
1943         op2->o_hdr = &sopbuf2->sob_hdr;
1944         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1945
1946         /* Copy the fields we care about explicitly, leave the rest alone */
1947         *op2->o_hdr = *op->o_hdr;
1948         op2->o_tag = op->o_tag;
1949         op2->o_time = op->o_time;
1950         op2->o_bd = on->on_info->oi_origdb;
1951         op2->o_request = op->o_request;
1952         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
1953         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
1954
1955         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1956         if ( i ) {
1957                 op2->ors_attrs = (AttributeName *) ptr;
1958                 ptr = (char *) &op2->ors_attrs[i+1];
1959                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1960                         op2->ors_attrs[i] = op->ors_attrs[i];
1961                         op2->ors_attrs[i].an_name.bv_val = ptr;
1962                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1963                 }
1964                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1965         }
1966
1967         op2->o_authz = op->o_authz;
1968         op2->o_ndn.bv_val = ptr;
1969         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1970         op2->o_dn = op2->o_ndn;
1971         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1972         op2->o_req_dn.bv_val = ptr;
1973         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1974         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1975         op2->o_req_ndn.bv_val = ptr;
1976         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1977         op2->ors_filterstr.bv_val = ptr;
1978         strcpy( ptr, so->s_filterstr.bv_val );
1979         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1980
1981         /* Skip the AND/GE clause that we stuck on in front */
1982         if ( so->s_flags & PS_FIX_FILTER ) {
1983                 op2->ors_filter = op->ors_filter->f_and->f_next;
1984                 so->s_flags ^= PS_FIX_FILTER;
1985         } else {
1986                 op2->ors_filter = op->ors_filter;
1987         }
1988         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1989         so->s_op = op2;
1990
1991         /* Copy any cached group ACLs individually */
1992         op2->o_groups = NULL;
1993         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1994                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1995                 *g2 = *g1;
1996                 strcpy( g2->ga_ndn, g1->ga_ndn );
1997                 g2->ga_next = op2->o_groups;
1998                 op2->o_groups = g2;
1999         }
2000         /* Don't allow any further group caching */
2001         op2->o_do_not_cache = 1;
2002
2003         /* Add op2 to conn so abandon will find us */
2004         op->o_conn->c_n_ops_executing++;
2005         op->o_conn->c_n_ops_completed--;
2006         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2007         so->s_flags |= PS_IS_DETACHED;
2008
2009         /* Prevent anyone else from trying to send a result for this op */
2010         op->o_abandon = 1;
2011 }
2012
2013 static int
2014 syncprov_search_response( Operation *op, SlapReply *rs )
2015 {
2016         searchstate *ss = op->o_callback->sc_private;
2017         slap_overinst *on = ss->ss_on;
2018         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2019         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2020
2021         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2022                 Attribute *a;
2023                 /* If we got a referral without a referral object, there's
2024                  * something missing that we cannot replicate. Just ignore it.
2025                  * The consumer will abort because we didn't send the expected
2026                  * control.
2027                  */
2028                 if ( !rs->sr_entry ) {
2029                         assert( rs->sr_entry != NULL );
2030                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2031                         return SLAP_CB_CONTINUE;
2032                 }
2033                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2034                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2035                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2036                 }
2037                 if ( a ) {
2038                         int i, sid;
2039                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2040
2041                         /* Don't send changed entries back to the originator */
2042                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2043                                 Debug( LDAP_DEBUG_SYNC,
2044                                         "Entry %s changed by peer, ignored\n",
2045                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2046                                 return LDAP_SUCCESS;
2047                         }
2048
2049                         /* If not a persistent search */
2050                         if ( !ss->ss_so ) {
2051                                 /* Make sure entry is less than the snapshot'd contextCSN */
2052                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2053                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2054                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2055                                                 Debug( LDAP_DEBUG_SYNC,
2056                                                         "Entry %s CSN %s greater than snapshot %s\n",
2057                                                         rs->sr_entry->e_name.bv_val,
2058                                                         a->a_nvals[0].bv_val,
2059                                                         ss->ss_ctxcsn[i].bv_val );
2060                                                 return LDAP_SUCCESS;
2061                                         }
2062                                 }
2063                         }
2064
2065                         /* Don't send old entries twice */
2066                         if ( srs->sr_state.ctxcsn ) {
2067                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2068                                         if ( sid == srs->sr_state.sids[i] &&
2069                                                 ber_bvcmp( &a->a_nvals[0],
2070                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2071                                                 Debug( LDAP_DEBUG_SYNC,
2072                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2073                                                         rs->sr_entry->e_name.bv_val,
2074                                                         a->a_nvals[0].bv_val,
2075                                                         srs->sr_state.ctxcsn[i].bv_val );
2076                                                 return LDAP_SUCCESS;
2077                                         }
2078                                 }
2079                         }
2080                 }
2081                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2082                         op->o_tmpmemctx );
2083                 rs->sr_ctrls[1] = NULL;
2084                 /* If we're in delta-sync mode, always send a cookie */
2085                 if ( si->si_nopres && si->si_usehint && a ) {
2086                         struct berval cookie;
2087                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2088                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2089                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2090                 } else {
2091                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2092                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2093                 }
2094         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2095                 struct berval cookie;
2096
2097                 if ( ss->ss_flags & SS_CHANGED ) {
2098                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2099                                 srs->sr_state.rid, srs->sr_state.sid );
2100
2101                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2102                 }
2103
2104                 /* Is this a regular refresh?
2105                  * Note: refresh never gets here if there were no changes
2106                  */
2107                 if ( !ss->ss_so ) {
2108                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2109                                 op->o_tmpmemctx );
2110                         rs->sr_ctrls[1] = NULL;
2111                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2112                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2113                                         LDAP_SYNC_REFRESH_DELETES );
2114                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2115                 } else {
2116                 /* It's RefreshAndPersist, transition to Persist phase */
2117                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2118                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2119                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2120                                 1, NULL, 0 );
2121                         if ( ss->ss_flags & SS_CHANGED )
2122                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2123
2124                         /* Detach this Op from frontend control */
2125                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2126                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2127
2128                         /* But not if this connection was closed along the way */
2129                         if ( op->o_abandon ) {
2130                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2131                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2132                                 /* syncprov_ab_cleanup will free this syncop */
2133                                 return SLAPD_ABANDON;
2134
2135                         } else {
2136                                 /* Turn off the refreshing flag */
2137                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2138
2139                                 syncprov_detach_op( op, ss->ss_so, on );
2140
2141                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2142
2143                                 /* If there are queued responses, fire them off */
2144                                 if ( ss->ss_so->s_res )
2145                                         syncprov_qstart( ss->ss_so );
2146                         }
2147                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2148
2149                         return LDAP_SUCCESS;
2150                 }
2151         }
2152
2153         return SLAP_CB_CONTINUE;
2154 }
2155
2156 static int
2157 syncprov_op_search( Operation *op, SlapReply *rs )
2158 {
2159         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2160         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2161         slap_callback   *cb;
2162         int gotstate = 0, changed = 0, do_present = 0;
2163         syncops *sop = NULL;
2164         searchstate *ss;
2165         sync_control *srs;
2166         BerVarray ctxcsn;
2167         int i, *sids, numcsns;
2168         struct berval mincsn;
2169
2170         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2171
2172         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2173                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2174                 return rs->sr_err;
2175         }
2176
2177         srs = op->o_controls[slap_cids.sc_LDAPsync];
2178         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2179
2180         /* If this is a persistent search, set it up right away */
2181         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2182                 syncops so = {0};
2183                 fbase_cookie fc;
2184                 opcookie opc;
2185                 slap_callback sc;
2186
2187                 fc.fss = &so;
2188                 fc.fbase = 0;
2189                 so.s_eid = NOID;
2190                 so.s_op = op;
2191                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2192                 /* syncprov_findbase expects to be called as a callback... */
2193                 sc.sc_private = &opc;
2194                 opc.son = on;
2195                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2196                 cb = op->o_callback;
2197                 op->o_callback = &sc;
2198                 rs->sr_err = syncprov_findbase( op, &fc );
2199                 op->o_callback = cb;
2200                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2201
2202                 if ( rs->sr_err != LDAP_SUCCESS ) {
2203                         send_ldap_result( op, rs );
2204                         return rs->sr_err;
2205                 }
2206                 sop = ch_malloc( sizeof( syncops ));
2207                 *sop = so;
2208                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2209                 sop->s_rid = srs->sr_state.rid;
2210                 sop->s_sid = srs->sr_state.sid;
2211                 sop->s_inuse = 1;
2212
2213                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2214                 sop->s_next = si->si_ops;
2215                 si->si_ops = sop;
2216                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2217         }
2218
2219         /* snapshot the ctxcsn */
2220         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2221         numcsns = si->si_numcsns;
2222         if ( numcsns ) {
2223                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2224                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2225                 for ( i=0; i<numcsns; i++ )
2226                         sids[i] = si->si_sids[i];
2227         } else {
2228                 ctxcsn = NULL;
2229                 sids = NULL;
2230         }
2231         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2232
2233         /* If we have a cookie, handle the PRESENT lookups */
2234         if ( srs->sr_state.ctxcsn ) {
2235                 sessionlog *sl;
2236                 int i, j;
2237
2238                 /* If we don't have any CSN of our own yet, pretend nothing
2239                  * has changed.
2240                  */
2241                 if ( !numcsns )
2242                         goto no_change;
2243
2244                 if ( !si->si_nopres )
2245                         do_present = SS_PRESENT;
2246
2247                 /* If there are SIDs we don't recognize in the cookie, drop them */
2248                 for (i=0; i<srs->sr_state.numcsns; ) {
2249                         for (j=0; j<numcsns; j++) {
2250                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2251                                         break;
2252                                 }
2253                         }
2254                         /* not found */
2255                         if ( j == numcsns ) {
2256                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2257                                 j = srs->sr_state.numcsns - 1;
2258                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2259                                 tmp.bv_len = 0;
2260                                 srs->sr_state.ctxcsn[j] = tmp;
2261                                 srs->sr_state.numcsns = j;
2262                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2263                                 continue;
2264                         }
2265                         i++;
2266                 }
2267
2268                 /* Find the smallest CSN */
2269                 mincsn = srs->sr_state.ctxcsn[0];
2270                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2271                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2272                                 mincsn = srs->sr_state.ctxcsn[i];
2273                 }
2274
2275                 /* If nothing has changed, shortcut it */
2276                 if ( srs->sr_state.numcsns == numcsns ) {
2277                         int i, j;
2278                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2279                                 for ( j=0; j<numcsns; j++ ) {
2280                                         if ( srs->sr_state.sids[i] != sids[j] )
2281                                                 continue;
2282                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2283                                                 changed = SS_CHANGED;
2284                                         break;
2285                                 }
2286                                 if ( changed )
2287                                         break;
2288                         }
2289                         if ( !changed ) {
2290                                 do_present = 0;
2291 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2292                                         LDAPControl     *ctrls[2];
2293
2294                                         ctrls[0] = NULL;
2295                                         ctrls[1] = NULL;
2296                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2297                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2298                                         rs->sr_ctrls = ctrls;
2299                                         rs->sr_err = LDAP_SUCCESS;
2300                                         send_ldap_result( op, rs );
2301                                         rs->sr_ctrls = NULL;
2302                                         return rs->sr_err;
2303                                 }
2304                                 goto shortcut;
2305                         }
2306                 } else {
2307                         /* consumer doesn't have the right number of CSNs */
2308                         changed = SS_CHANGED;
2309                 }
2310                 /* Do we have a sessionlog for this search? */
2311                 sl=si->si_logs;
2312                 if ( sl ) {
2313                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2314                         /* Are there any log entries, and is the consumer state
2315                          * present in the session log?
2316                          */
2317                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2318                                 do_present = 0;
2319                                 /* mutex is unlocked in playlog */
2320                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2321                         } else {
2322                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2323                         }
2324                 }
2325                 /* Is the CSN still present in the database? */
2326                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2327                         /* No, so a reload is required */
2328                         /* the 2.2 consumer doesn't send this hint */
2329                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2330                                 if ( ctxcsn )
2331                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2332                                 if ( sids )
2333                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2334                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2335                                 return rs->sr_err;
2336                         }
2337                         if ( srs->sr_state.ctxcsn ) {
2338                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2339                                 srs->sr_state.ctxcsn = NULL;
2340                         }
2341                         if ( srs->sr_state.sids ) {
2342                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2343                                 srs->sr_state.sids = NULL;
2344                         }
2345                         srs->sr_state.numcsns = 0;
2346                 } else {
2347                         gotstate = 1;
2348                         /* If changed and doing Present lookup, send Present UUIDs */
2349                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2350                                 LDAP_SUCCESS ) {
2351                                 if ( ctxcsn )
2352                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2353                                 if ( sids )
2354                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2355                                 send_ldap_result( op, rs );
2356                                 return rs->sr_err;
2357                         }
2358                 }
2359         } else {
2360                 /* No consumer state, assume something has changed */
2361                 changed = SS_CHANGED;
2362         }
2363
2364 shortcut:
2365         /* Append CSN range to search filter, save original filter
2366          * for persistent search evaluation
2367          */
2368         if ( sop ) {
2369                 sop->s_filterstr= op->ors_filterstr;
2370         }
2371
2372         /* If something changed, find the changes */
2373         if ( gotstate && changed ) {
2374                 Filter *fand, *fava;
2375
2376                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2377                 fand->f_choice = LDAP_FILTER_AND;
2378                 fand->f_next = NULL;
2379                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2380                 fand->f_and = fava;
2381                 fava->f_choice = LDAP_FILTER_GE;
2382                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2383                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2384 #ifdef LDAP_COMP_MATCH
2385                 fava->f_ava->aa_cf = NULL;
2386 #endif
2387                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2388                 fava->f_next = op->ors_filter;
2389                 op->ors_filter = fand;
2390                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2391                 if ( sop )
2392                         sop->s_flags |= PS_FIX_FILTER;
2393         }
2394
2395         /* Let our callback add needed info to returned entries */
2396         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2397         ss = (searchstate *)(cb+1);
2398         ss->ss_on = on;
2399         ss->ss_so = sop;
2400         ss->ss_flags = do_present | changed;
2401         ss->ss_ctxcsn = ctxcsn;
2402         ss->ss_numcsns = numcsns;
2403         ss->ss_sids = sids;
2404         cb->sc_response = syncprov_search_response;
2405         cb->sc_cleanup = syncprov_search_cleanup;
2406         cb->sc_private = ss;
2407         cb->sc_next = op->o_callback;
2408         op->o_callback = cb;
2409
2410         /* If this is a persistent search and no changes were reported during
2411          * the refresh phase, just invoke the response callback to transition
2412          * us into persist phase
2413          */
2414         if ( !changed ) {
2415                 rs->sr_err = LDAP_SUCCESS;
2416                 rs->sr_nentries = 0;
2417                 send_ldap_result( op, rs );
2418                 return rs->sr_err;
2419         }
2420         return SLAP_CB_CONTINUE;
2421 }
2422
2423 static int
2424 syncprov_operational(
2425         Operation *op,
2426         SlapReply *rs )
2427 {
2428         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2429         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2430
2431         /* This prevents generating unnecessarily; frontend will strip
2432          * any statically stored copy.
2433          */
2434         if ( op->o_sync != SLAP_CONTROL_NONE )
2435                 return SLAP_CB_CONTINUE;
2436
2437         if ( rs->sr_entry &&
2438                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2439
2440                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2441                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2442                         Attribute *a, **ap = NULL;
2443
2444                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2445                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2446                                         break;
2447                         }
2448
2449                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2450                         if ( si->si_ctxcsn ) {
2451                                 if ( !a ) {
2452                                         for ( ap = &rs->sr_operational_attrs; *ap;
2453                                                 ap=&(*ap)->a_next );
2454
2455                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2456                                         *ap = a;
2457                                 }
2458
2459                                 if ( !ap ) {
2460                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2461                                                 Entry *e = entry_dup( rs->sr_entry );
2462                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2463                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2464                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2465                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2466                                                         entry_free( rs->sr_entry );
2467                                                 }
2468                                                 rs->sr_entry = e;
2469                                                 rs->sr_flags |=
2470                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2471                                                 a = attr_find( rs->sr_entry->e_attrs,
2472                                                         slap_schema.si_ad_contextCSN );
2473                                         }
2474                                         if ( a->a_nvals != a->a_vals ) {
2475                                                 ber_bvarray_free( a->a_nvals );
2476                                         }
2477                                         a->a_nvals = NULL;
2478                                         ber_bvarray_free( a->a_vals );
2479                                         a->a_vals = NULL;
2480                                         a->a_numvals = 0;
2481                                 }
2482                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2483                         }
2484                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2485                 }
2486         }
2487         return SLAP_CB_CONTINUE;
2488 }
2489
2490 enum {
2491         SP_CHKPT = 1,
2492         SP_SESSL,
2493         SP_NOPRES,
2494         SP_USEHINT
2495 };
2496
2497 static ConfigDriver sp_cf_gen;
2498
2499 static ConfigTable spcfg[] = {
2500         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2501                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2502                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2503                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2504         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2505                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2506                         "DESC 'Session log size in ops' "
2507                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2508         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2509                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2510                         "DESC 'Omit Present phase processing' "
2511                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2512         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2513                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2514                         "DESC 'Observe Reload Hint in Request control' "
2515                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2516         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2517 };
2518
2519 static ConfigOCs spocs[] = {
2520         { "( OLcfgOvOc:1.1 "
2521                 "NAME 'olcSyncProvConfig' "
2522                 "DESC 'SyncRepl Provider configuration' "
2523                 "SUP olcOverlayConfig "
2524                 "MAY ( olcSpCheckpoint "
2525                         "$ olcSpSessionlog "
2526                         "$ olcSpNoPresent "
2527                         "$ olcSpReloadHint "
2528                 ") )",
2529                         Cft_Overlay, spcfg },
2530         { NULL, 0, NULL }
2531 };
2532
2533 static int
2534 sp_cf_gen(ConfigArgs *c)
2535 {
2536         slap_overinst           *on = (slap_overinst *)c->bi;
2537         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2538         int rc = 0;
2539
2540         if ( c->op == SLAP_CONFIG_EMIT ) {
2541                 switch ( c->type ) {
2542                 case SP_CHKPT:
2543                         if ( si->si_chkops || si->si_chktime ) {
2544                                 struct berval bv;
2545                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2546                                         "%d %d", si->si_chkops, si->si_chktime );
2547                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2548                                         rc = 1;
2549                                 } else {
2550                                         bv.bv_val = c->cr_msg;
2551                                         value_add_one( &c->rvalue_vals, &bv );
2552                                 }
2553                         } else {
2554                                 rc = 1;
2555                         }
2556                         break;
2557                 case SP_SESSL:
2558                         if ( si->si_logs ) {
2559                                 c->value_int = si->si_logs->sl_size;
2560                         } else {
2561                                 rc = 1;
2562                         }
2563                         break;
2564                 case SP_NOPRES:
2565                         if ( si->si_nopres ) {
2566                                 c->value_int = 1;
2567                         } else {
2568                                 rc = 1;
2569                         }
2570                         break;
2571                 case SP_USEHINT:
2572                         if ( si->si_usehint ) {
2573                                 c->value_int = 1;
2574                         } else {
2575                                 rc = 1;
2576                         }
2577                         break;
2578                 }
2579                 return rc;
2580         } else if ( c->op == LDAP_MOD_DELETE ) {
2581                 switch ( c->type ) {
2582                 case SP_CHKPT:
2583                         si->si_chkops = 0;
2584                         si->si_chktime = 0;
2585                         break;
2586                 case SP_SESSL:
2587                         if ( si->si_logs )
2588                                 si->si_logs->sl_size = 0;
2589                         else
2590                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2591                         break;
2592                 case SP_NOPRES:
2593                         if ( si->si_nopres )
2594                                 si->si_nopres = 0;
2595                         else
2596                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2597                         break;
2598                 case SP_USEHINT:
2599                         if ( si->si_usehint )
2600                                 si->si_usehint = 0;
2601                         else
2602                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2603                         break;
2604                 }
2605                 return rc;
2606         }
2607         switch ( c->type ) {
2608         case SP_CHKPT:
2609                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2610                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2611                                 c->argv[0], c->argv[1] );
2612                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2613                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2614                         return ARG_BAD_CONF;
2615                 }
2616                 if ( si->si_chkops <= 0 ) {
2617                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2618                                 c->argv[0], si->si_chkops );
2619                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2620                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2621                         return ARG_BAD_CONF;
2622                 }
2623                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2624                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2625                                 c->argv[0], c->argv[1] );
2626                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2627                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2628                         return ARG_BAD_CONF;
2629                 }
2630                 if ( si->si_chktime <= 0 ) {
2631                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2632                                 c->argv[0], si->si_chkops );
2633                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2634                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2635                         return ARG_BAD_CONF;
2636                 }
2637                 si->si_chktime *= 60;
2638                 break;
2639         case SP_SESSL: {
2640                 sessionlog *sl;
2641                 int size = c->value_int;
2642
2643                 if ( size < 0 ) {
2644                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2645                                 c->argv[0], size );
2646                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2647                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2648                         return ARG_BAD_CONF;
2649                 }
2650                 sl = si->si_logs;
2651                 if ( !sl ) {
2652                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2653                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2654                         sl->sl_mincsn.bv_len = 0;
2655                         sl->sl_num = 0;
2656                         sl->sl_head = sl->sl_tail = NULL;
2657                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2658                         si->si_logs = sl;
2659                 }
2660                 sl->sl_size = size;
2661                 }
2662                 break;
2663         case SP_NOPRES:
2664                 si->si_nopres = c->value_int;
2665                 break;
2666         case SP_USEHINT:
2667                 si->si_usehint = c->value_int;
2668                 break;
2669         }
2670         return rc;
2671 }
2672
2673 /* ITS#3456 we cannot run this search on the main thread, must use a
2674  * child thread in order to insure we have a big enough stack.
2675  */
2676 static void *
2677 syncprov_db_otask(
2678         void *ptr
2679 )
2680 {
2681         syncprov_findcsn( ptr, FIND_MAXCSN );
2682         return NULL;
2683 }
2684
2685 /* Read any existing contextCSN from the underlying db.
2686  * Then search for any entries newer than that. If no value exists,
2687  * just generate it. Cache whatever result.
2688  */
2689 static int
2690 syncprov_db_open(
2691         BackendDB *be,
2692         ConfigReply *cr
2693 )
2694 {
2695         slap_overinst   *on = (slap_overinst *) be->bd_info;
2696         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2697
2698         Connection conn = { 0 };
2699         OperationBuffer opbuf;
2700         Operation *op;
2701         Entry *e = NULL;
2702         Attribute *a;
2703         int rc;
2704         void *thrctx = NULL;
2705
2706         if ( !SLAP_LASTMOD( be )) {
2707                 Debug( LDAP_DEBUG_ANY,
2708                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2709                 return -1;
2710         }
2711
2712         if ( slapMode & SLAP_TOOL_MODE ) {
2713                 return 0;
2714         }
2715
2716         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2717         if ( rc ) {
2718                 return rc;
2719         }
2720
2721         thrctx = ldap_pvt_thread_pool_context();
2722         connection_fake_init( &conn, &opbuf, thrctx );
2723         op = &opbuf.ob_op;
2724         op->o_bd = be;
2725         op->o_dn = be->be_rootdn;
2726         op->o_ndn = be->be_rootndn;
2727
2728         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2729                 slap_schema.si_ad_contextCSN, 0, &e, on );
2730
2731         if ( e ) {
2732                 ldap_pvt_thread_t tid;
2733
2734                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2735                 if ( a ) {
2736                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2737                         si->si_numcsns = a->a_numvals;
2738                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2739                 }
2740                 overlay_entry_release_ov( op, e, 0, on );
2741                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2742                         op->o_req_dn = be->be_suffix[0];
2743                         op->o_req_ndn = be->be_nsuffix[0];
2744                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2745                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2746                         ldap_pvt_thread_join( tid, NULL );
2747                 }
2748         }
2749
2750         /* Didn't find a contextCSN, should we generate one? */
2751         if ( !si->si_ctxcsn ) {
2752                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2753                 struct berval csn;
2754
2755                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2756                 /* If we're also a consumer, then don't generate anything.
2757                  * Wait for our provider to send it to us, or for a local
2758                  * modify if we have multimaster.
2759                  */
2760                         goto out;
2761                 }
2762                 csn.bv_val = csnbuf;
2763                 csn.bv_len = sizeof( csnbuf );
2764                 slap_get_csn( op, &csn, 0 );
2765                 value_add_one( &si->si_ctxcsn, &csn );
2766                 si->si_numcsns = 1;
2767                 si->si_sids = ch_malloc( sizeof(int) );
2768                 si->si_sids[0] = slap_serverID;
2769
2770                 /* make sure we do a checkpoint on close */
2771                 si->si_numops++;
2772         }
2773
2774 out:
2775         op->o_bd->bd_info = (BackendInfo *)on;
2776         return 0;
2777 }
2778
2779 /* Write the current contextCSN into the underlying db.
2780  */
2781 static int
2782 syncprov_db_close(
2783         BackendDB *be,
2784         ConfigReply *cr
2785 )
2786 {
2787     slap_overinst   *on = (slap_overinst *) be->bd_info;
2788     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2789
2790         if ( slapMode & SLAP_TOOL_MODE ) {
2791                 return 0;
2792         }
2793         if ( si->si_numops ) {
2794                 Connection conn = {0};
2795                 OperationBuffer opbuf;
2796                 Operation *op;
2797                 SlapReply rs = {REP_RESULT};
2798                 void *thrctx;
2799
2800                 thrctx = ldap_pvt_thread_pool_context();
2801                 connection_fake_init( &conn, &opbuf, thrctx );
2802                 op = &opbuf.ob_op;
2803                 op->o_bd = be;
2804                 op->o_dn = be->be_rootdn;
2805                 op->o_ndn = be->be_rootndn;
2806                 syncprov_checkpoint( op, &rs, on );
2807         }
2808
2809     return 0;
2810 }
2811
2812 static int
2813 syncprov_db_init(
2814         BackendDB *be,
2815         ConfigReply *cr
2816 )
2817 {
2818         slap_overinst   *on = (slap_overinst *)be->bd_info;
2819         syncprov_info_t *si;
2820
2821         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2822                 Debug( LDAP_DEBUG_ANY,
2823                         "syncprov must be instantiated within a database.\n",
2824                         0, 0, 0 );
2825                 return 1;
2826         }
2827
2828         si = ch_calloc(1, sizeof(syncprov_info_t));
2829         on->on_bi.bi_private = si;
2830         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2831         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2832         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2833
2834         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2835         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2836         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2837         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2838
2839         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2840         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2841
2842         return 0;
2843 }
2844
2845 static int
2846 syncprov_db_destroy(
2847         BackendDB *be,
2848         ConfigReply *cr
2849 )
2850 {
2851         slap_overinst   *on = (slap_overinst *)be->bd_info;
2852         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2853
2854         if ( si ) {
2855                 if ( si->si_logs ) {
2856                         slog_entry *se = si->si_logs->sl_head;
2857
2858                         while ( se ) {
2859                                 slog_entry *se_next = se->se_next;
2860                                 ch_free( se );
2861                                 se = se_next;
2862                         }
2863
2864                         ch_free( si->si_logs );
2865                 }
2866                 if ( si->si_ctxcsn )
2867                         ber_bvarray_free( si->si_ctxcsn );
2868                 if ( si->si_sids )
2869                         ch_free( si->si_sids );
2870                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2871                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2872                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2873                 ch_free( si );
2874         }
2875
2876         return 0;
2877 }
2878
2879 static int syncprov_parseCtrl (
2880         Operation *op,
2881         SlapReply *rs,
2882         LDAPControl *ctrl )
2883 {
2884         ber_tag_t tag;
2885         BerElementBuffer berbuf;
2886         BerElement *ber = (BerElement *)&berbuf;
2887         ber_int_t mode;
2888         ber_len_t len;
2889         struct berval cookie = BER_BVNULL;
2890         sync_control *sr;
2891         int rhint = 0;
2892
2893         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2894                 rs->sr_text = "Sync control specified multiple times";
2895                 return LDAP_PROTOCOL_ERROR;
2896         }
2897
2898         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2899                 rs->sr_text = "Sync control specified with pagedResults control";
2900                 return LDAP_PROTOCOL_ERROR;
2901         }
2902
2903         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2904                 rs->sr_text = "Sync control value is absent";
2905                 return LDAP_PROTOCOL_ERROR;
2906         }
2907
2908         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2909                 rs->sr_text = "Sync control value is empty";
2910                 return LDAP_PROTOCOL_ERROR;
2911         }
2912
2913         /* Parse the control value
2914          *      syncRequestValue ::= SEQUENCE {
2915          *              mode   ENUMERATED {
2916          *                      -- 0 unused
2917          *                      refreshOnly             (1),
2918          *                      -- 2 reserved
2919          *                      refreshAndPersist       (3)
2920          *              },
2921          *              cookie  syncCookie OPTIONAL
2922          *      }
2923          */
2924
2925         ber_init2( ber, &ctrl->ldctl_value, 0 );
2926
2927         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2928                 rs->sr_text = "Sync control : mode decoding error";
2929                 return LDAP_PROTOCOL_ERROR;
2930         }
2931
2932         switch( mode ) {
2933         case LDAP_SYNC_REFRESH_ONLY:
2934                 mode = SLAP_SYNC_REFRESH;
2935                 break;
2936         case LDAP_SYNC_REFRESH_AND_PERSIST:
2937                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2938                 break;
2939         default:
2940                 rs->sr_text = "Sync control : unknown update mode";
2941                 return LDAP_PROTOCOL_ERROR;
2942         }
2943
2944         tag = ber_peek_tag( ber, &len );
2945
2946         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2947                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2948                         rs->sr_text = "Sync control : cookie decoding error";
2949                         return LDAP_PROTOCOL_ERROR;
2950                 }
2951                 tag = ber_peek_tag( ber, &len );
2952         }
2953         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2954                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2955                         rs->sr_text = "Sync control : rhint decoding error";
2956                         return LDAP_PROTOCOL_ERROR;
2957                 }
2958         }
2959         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2960                         rs->sr_text = "Sync control : decoding error";
2961                         return LDAP_PROTOCOL_ERROR;
2962         }
2963         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2964         sr->sr_rhint = rhint;
2965         if (!BER_BVISNULL(&cookie)) {
2966                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2967                 /* If parse fails, pretend no cookie was sent */
2968                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2969                         sr->sr_state.rid == -1 ) {
2970                         if ( sr->sr_state.ctxcsn ) {
2971                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2972                                 sr->sr_state.ctxcsn = NULL;
2973                         }
2974                         sr->sr_state.numcsns = 0;
2975                 }
2976         }
2977
2978         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2979
2980         op->o_sync = ctrl->ldctl_iscritical
2981                 ? SLAP_CONTROL_CRITICAL
2982                 : SLAP_CONTROL_NONCRITICAL;
2983
2984         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2985
2986         return LDAP_SUCCESS;
2987 }
2988
2989 /* This overlay is set up for dynamic loading via moduleload. For static
2990  * configuration, you'll need to arrange for the slap_overinst to be
2991  * initialized and registered by some other function inside slapd.
2992  */
2993
2994 static slap_overinst            syncprov;
2995
2996 int
2997 syncprov_initialize()
2998 {
2999         int rc;
3000
3001         rc = register_supported_control( LDAP_CONTROL_SYNC,
3002                 SLAP_CTRL_SEARCH, NULL,
3003                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3004         if ( rc != LDAP_SUCCESS ) {
3005                 Debug( LDAP_DEBUG_ANY,
3006                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3007                 return rc;
3008         }
3009
3010         syncprov.on_bi.bi_type = "syncprov";
3011         syncprov.on_bi.bi_db_init = syncprov_db_init;
3012         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3013         syncprov.on_bi.bi_db_open = syncprov_db_open;
3014         syncprov.on_bi.bi_db_close = syncprov_db_close;
3015
3016         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3017         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3018
3019         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3020         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3021         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3022         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3023         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3024         syncprov.on_bi.bi_op_search = syncprov_op_search;
3025         syncprov.on_bi.bi_extended = syncprov_op_extended;
3026         syncprov.on_bi.bi_operational = syncprov_operational;
3027
3028         syncprov.on_bi.bi_cf_ocs = spocs;
3029
3030         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3031
3032         rc = config_register_schema( spcfg, spocs );
3033         if ( rc ) return rc;
3034
3035         return overlay_register( &syncprov );
3036 }
3037
3038 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3039 int
3040 init_module( int argc, char *argv[] )
3041 {
3042         return syncprov_initialize();
3043 }
3044 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3045
3046 #endif /* defined(SLAPD_OVER_SYNCPROV) */