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 2004-2008 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 < 0 || 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 < 0 || 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         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 913         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 914         return rc;
 915 }
 916
 917 /* runqueue task for playing back queued responses */
 918 static void *
 919 syncprov_qtask( void *ctx, void *arg )
 920 {
 921         struct re_s *rtask = arg;
 922         syncops *so = rtask->arg;
 923         OperationBuffer opbuf;
 924         Operation *op;
 925         BackendDB be;
 926         int rc;
 927
 928         op = &opbuf.ob_op;
 929         *op = *so->s_op;
 930         op->o_hdr = &opbuf.ob_hdr;
 931         op->o_controls = opbuf.ob_controls;
 932         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 933
 934         *op->o_hdr = *so->s_op->o_hdr;
 935
 936         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 937         op->o_tmpmfuncs = &slap_sl_mfuncs;
 938         op->o_threadctx = ctx;
 939
 940         /* syncprov_qplay expects a fake db */
 941         be = *so->s_op->o_bd;
 942         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 943         op->o_bd = &be;
 944         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 945         op->o_callback = NULL;
 946
 947         rc = syncprov_qplay( op, rtask );
 948
 949         /* decrement use count... */
 950         syncprov_free_syncop( so );
 951
 952 #if 0   /* FIXME: connection_close isn't exported from slapd.
 953                  * should it be?
 954                  */
 955         if ( rc ) {
 956                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 957                 if ( connection_state_closing( op->o_conn )) {
 958                         connection_close( op->o_conn );
 959                 }
 960                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 961         }
 962 #endif
 963         return NULL;
 964 }
 965
 966 /* Start the task to play back queued psearch responses */
 967 static void
 968 syncprov_qstart( syncops *so )
 969 {
 970         int wake=0;
 971         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 972         if ( !so->s_qtask ) {
 973                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 974                         syncprov_qtask, so, "syncprov_qtask",
 975                         so->s_op->o_conn->c_peer_name.bv_val );
 976                 ++so->s_inuse;
 977                 wake = 1;
 978         } else {
 979                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 980                         !so->s_qtask->next_sched.tv_sec ) {
 981                         so->s_qtask->interval.tv_sec = 0;
 982                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 983                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 984                         ++so->s_inuse;
 985                         wake = 1;
 986                 }
 987         }
 988         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 989         if ( wake )
 990                 slap_wake_listener();
 991 }
 992
 993 /* Queue a persistent search response */
 994 static int
 995 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 996 {
 997         syncres *sr;
 998         int sid, srsize;
 999
1000         /* Don't send changes back to their originator */
1001         sid = slap_parse_csn_sid( &opc->sctxcsn );
1002         if ( sid >= 0 && sid == so->s_sid )
1003                 return LDAP_SUCCESS;
1004
1005         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1006                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1007         if ( opc->sctxcsn.bv_len )
1008                 srsize += opc->sctxcsn.bv_len + 1;
1009         sr = ch_malloc( srsize );
1010         sr->s_next = NULL;
1011         sr->s_dn.bv_val = (char *)(sr + 1);
1012         sr->s_dn.bv_len = opc->sdn.bv_len;
1013         sr->s_mode = mode;
1014         sr->s_isreference = opc->sreference;
1015         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1016                  opc->sdn.bv_val ) + 1;
1017         sr->s_ndn.bv_len = opc->sndn.bv_len;
1018         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1019                  opc->sndn.bv_val ) + 1;
1020         sr->s_uuid.bv_len = opc->suuid.bv_len;
1021         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1022         if ( opc->sctxcsn.bv_len ) {
1023                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1024                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1025         } else {
1026                 sr->s_csn.bv_val = NULL;
1027         }
1028         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1029
1030         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1031         if ( !so->s_res ) {
1032                 so->s_res = sr;
1033         } else {
1034                 so->s_restail->s_next = sr;
1035         }
1036         so->s_restail = sr;
1037
1038         /* If the base of the psearch was modified, check it next time round */
1039         if ( so->s_flags & PS_WROTE_BASE ) {
1040                 so->s_flags ^= PS_WROTE_BASE;
1041                 so->s_flags |= PS_FIND_BASE;
1042         }
1043         if ( so->s_flags & PS_IS_DETACHED ) {
1044                 syncprov_qstart( so );
1045         }
1046         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1047         return LDAP_SUCCESS;
1048 }
1049
1050 static int
1051 syncprov_drop_psearch( syncops *so, int lock )
1052 {
1053         if ( so->s_flags & PS_IS_DETACHED ) {
1054                 if ( lock )
1055                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1056                 so->s_op->o_conn->c_n_ops_executing--;
1057                 so->s_op->o_conn->c_n_ops_completed++;
1058                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1059                         o_next );
1060                 if ( lock )
1061                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1062         }
1063         syncprov_free_syncop( so );
1064
1065         return 0;
1066 }
1067
1068 static int
1069 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1070 {
1071         slap_callback *sc = op->o_callback;
1072         op->o_callback = sc->sc_next;
1073         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1074         op->o_tmpfree( sc, op->o_tmpmemctx );
1075         return 0;
1076 }
1077
1078 static int
1079 syncprov_op_abandon( Operation *op, SlapReply *rs )
1080 {
1081         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1082         syncprov_info_t         *si = on->on_bi.bi_private;
1083         syncops *so, *soprev;
1084
1085         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1086         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1087                 soprev=so, so=so->s_next ) {
1088                 if ( so->s_op->o_connid == op->o_connid &&
1089                         so->s_op->o_msgid == op->orn_msgid ) {
1090                                 so->s_op->o_abandon = 1;
1091                                 soprev->s_next = so->s_next;
1092                                 break;
1093                 }
1094         }
1095         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1096         if ( so ) {
1097                 /* Is this really a Cancel exop? */
1098                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1099                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1100                         rs->sr_err = LDAP_CANCELLED;
1101                         send_ldap_result( so->s_op, rs );
1102                         if ( so->s_flags & PS_IS_DETACHED ) {
1103                                 slap_callback *cb;
1104                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1105                                 cb->sc_cleanup = syncprov_ab_cleanup;
1106                                 cb->sc_next = op->o_callback;
1107                                 cb->sc_private = so;
1108                                 return SLAP_CB_CONTINUE;
1109                         }
1110                 }
1111                 syncprov_drop_psearch( so, 0 );
1112         }
1113         return SLAP_CB_CONTINUE;
1114 }
1115
1116 /* Find which persistent searches are affected by this operation */
1117 static void
1118 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1119 {
1120         slap_overinst *on = opc->son;
1121         syncprov_info_t         *si = on->on_bi.bi_private;
1122
1123         fbase_cookie fc;
1124         syncops *ss, *sprev, *snext;
1125         Entry *e = NULL;
1126         Attribute *a;
1127         int rc;
1128         struct berval newdn;
1129         int freefdn = 0;
1130         BackendDB *b0 = op->o_bd, db;
1131
1132         fc.fdn = &op->o_req_ndn;
1133         /* compute new DN */
1134         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1135                 struct berval pdn;
1136                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1137                 else dnParent( fc.fdn, &pdn );
1138                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1139                 fc.fdn = &newdn;
1140                 freefdn = 1;
1141         }
1142         if ( op->o_tag != LDAP_REQ_ADD ) {
1143                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1144                         db = *op->o_bd;
1145                         op->o_bd = &db;
1146                 }
1147                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1148                 /* If we're sending responses now, make a copy and unlock the DB */
1149                 if ( e && !saveit ) {
1150                         Entry *e2 = entry_dup( e );
1151                         overlay_entry_release_ov( op, e, 0, on );
1152                         e = e2;
1153                 }
1154                 if ( rc ) {
1155                         op->o_bd = b0;
1156                         return;
1157                 }
1158         } else {
1159                 e = op->ora_e;
1160         }
1161
1162         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1163                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1164                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1165                 opc->sreference = is_entry_referral( e );
1166                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1167                 if ( a )
1168                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1169         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1170                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1171                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1172                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1173                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1174         }
1175
1176         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1177         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1178                 sprev = ss, ss=snext)
1179         {
1180                 Operation op2;
1181                 Opheader oh;
1182                 syncmatches *sm;
1183                 int found = 0;
1184
1185                 snext = ss->s_next;
1186                 if ( ss->s_op->o_abandon )
1187                         continue;
1188
1189                 /* validate base */
1190                 fc.fss = ss;
1191                 fc.fbase = 0;
1192                 fc.fscope = 0;
1193
1194                 /* If the base of the search is missing, signal a refresh */
1195                 rc = syncprov_findbase( op, &fc );
1196                 if ( rc != LDAP_SUCCESS ) {
1197                         SlapReply rs = {REP_RESULT};
1198                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1199                                 "search base has changed" );
1200                         sprev->s_next = snext;
1201                         syncprov_drop_psearch( ss, 1 );
1202                         ss = sprev;
1203                         continue;
1204                 }
1205
1206
1207                 /* If we're sending results now, look for this op in old matches */
1208                 if ( !saveit ) {
1209                         syncmatches *old;
1210
1211                         /* Did we modify the search base? */
1212                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1213                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1214                                 ss->s_flags |= PS_WROTE_BASE;
1215                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1216                         }
1217
1218                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1219                                 old=sm, sm=sm->sm_next ) {
1220                                 if ( sm->sm_op == ss ) {
1221                                         found = 1;
1222                                         old->sm_next = sm->sm_next;
1223                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1224                                         break;
1225                                 }
1226                         }
1227                 }
1228
1229                 if ( fc.fscope ) {
1230                         op2 = *ss->s_op;
1231                         oh = *op->o_hdr;
1232                         oh.oh_conn = ss->s_op->o_conn;
1233                         oh.oh_connid = ss->s_op->o_connid;
1234                         op2.o_hdr = &oh;
1235                         op2.o_extra = op->o_extra;
1236                 }
1237
1238                 /* check if current o_req_dn is in scope and matches filter */
1239                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1240                         LDAP_COMPARE_TRUE ) {
1241                         if ( saveit ) {
1242                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1243                                 sm->sm_next = opc->smatches;
1244                                 sm->sm_op = ss;
1245                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1246                                 ++ss->s_inuse;
1247                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1248                                 opc->smatches = sm;
1249                         } else {
1250                                 /* if found send UPDATE else send ADD */
1251                                 syncprov_qresp( opc, ss,
1252                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1253                         }
1254                 } else if ( !saveit && found ) {
1255                         /* send DELETE */
1256                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1257                 }
1258         }
1259         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1260
1261         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1262                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1263                         op->o_bd = &db;
1264                 }
1265                 overlay_entry_release_ov( op, e, 0, on );
1266                 op->o_bd = b0;
1267         }
1268         if ( freefdn ) {
1269                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1270         }
1271         op->o_bd = b0;
1272 }
1273
1274 static int
1275 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1276 {
1277         slap_callback *cb = op->o_callback;
1278         opcookie *opc = cb->sc_private;
1279         slap_overinst *on = opc->son;
1280         syncprov_info_t         *si = on->on_bi.bi_private;
1281         syncmatches *sm, *snext;
1282         modtarget *mt, mtdummy;
1283
1284         for (sm = opc->smatches; sm; sm=snext) {
1285                 snext = sm->sm_next;
1286                 syncprov_free_syncop( sm->sm_op );
1287                 op->o_tmpfree( sm, op->o_tmpmemctx );
1288         }
1289
1290         /* Remove op from lock table */
1291         mtdummy.mt_op = op;
1292         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1293         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1294         if ( mt ) {
1295                 modinst *mi = mt->mt_mods;
1296
1297                 /* If there are more, promote the next one */
1298                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1299                 if ( mi->mi_next ) {
1300                         mt->mt_mods = mi->mi_next;
1301                         mt->mt_op = mt->mt_mods->mi_op;
1302                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1303                 } else {
1304                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1305                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1306                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1307                         ch_free( mt );
1308                 }
1309         }
1310         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1311         if ( !BER_BVISNULL( &opc->suuid ))
1312                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1313         if ( !BER_BVISNULL( &opc->sndn ))
1314                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1315         if ( !BER_BVISNULL( &opc->sdn ))
1316                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1317         op->o_callback = cb->sc_next;
1318         op->o_tmpfree(cb, op->o_tmpmemctx);
1319
1320         return 0;
1321 }
1322
1323 static void
1324 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1325 {
1326         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1327         Modifications mod;
1328         Operation opm;
1329         SlapReply rsm = { 0 };
1330         slap_callback cb = {0};
1331         BackendDB be;
1332
1333         mod.sml_numvals = si->si_numcsns;
1334         mod.sml_values = si->si_ctxcsn;
1335         mod.sml_nvalues = NULL;
1336         mod.sml_desc = slap_schema.si_ad_contextCSN;
1337         mod.sml_op = LDAP_MOD_REPLACE;
1338         mod.sml_flags = SLAP_MOD_INTERNAL;
1339         mod.sml_next = NULL;
1340
1341         cb.sc_response = slap_null_cb;
1342         opm = *op;
1343         opm.o_tag = LDAP_REQ_MODIFY;
1344         opm.o_callback = &cb;
1345         opm.orm_modlist = &mod;
1346         opm.orm_no_opattrs = 1;
1347         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1348                 be = *on->on_info->oi_origdb;
1349                 opm.o_bd = &be;
1350         }
1351         opm.o_req_dn = opm.o_bd->be_suffix[0];
1352         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1353         opm.o_bd->bd_info = on->on_info->oi_orig;
1354         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1355         opm.o_no_schema_check = 1;
1356         opm.o_bd->be_modify( &opm, &rsm );
1357         if ( mod.sml_next != NULL ) {
1358                 slap_mods_free( mod.sml_next, 1 );
1359         }
1360 }
1361
1362 static void
1363 syncprov_add_slog( Operation *op )
1364 {
1365         opcookie *opc = op->o_callback->sc_private;
1366         slap_overinst *on = opc->son;
1367         syncprov_info_t         *si = on->on_bi.bi_private;
1368         sessionlog *sl;
1369         slog_entry *se;
1370
1371         sl = si->si_logs;
1372         {
1373                 /* Allocate a record. UUIDs are not NUL-terminated. */
1374                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1375                         op->o_csn.bv_len + 1 );
1376                 se->se_next = NULL;
1377                 se->se_tag = op->o_tag;
1378
1379                 se->se_uuid.bv_val = (char *)(&se[1]);
1380                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1381                 se->se_uuid.bv_len = opc->suuid.bv_len;
1382
1383                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1384                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1385                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1386                 se->se_csn.bv_len = op->o_csn.bv_len;
1387                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1388
1389                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1390                 if ( sl->sl_head ) {
1391                         sl->sl_tail->se_next = se;
1392                 } else {
1393                         sl->sl_head = se;
1394                 }
1395                 sl->sl_tail = se;
1396                 sl->sl_num++;
1397                 while ( sl->sl_num > sl->sl_size ) {
1398                         se = sl->sl_head;
1399                         sl->sl_head = se->se_next;
1400                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1401                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1402                         ch_free( se );
1403                         sl->sl_num--;
1404                 }
1405                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1406         }
1407 }
1408
1409 /* Just set a flag if we found the matching entry */
1410 static int
1411 playlog_cb( Operation *op, SlapReply *rs )
1412 {
1413         if ( rs->sr_type == REP_SEARCH ) {
1414                 op->o_callback->sc_private = (void *)1;
1415         }
1416         return rs->sr_err;
1417 }
1418
1419 /* enter with sl->sl_mutex locked, release before returning */
1420 static void
1421 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1422         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1423 {
1424         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1425         slog_entry *se;
1426         int i, j, ndel, num, nmods, mmods;
1427         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1428         BerVarray uuids;
1429         struct berval delcsn[2];
1430
1431         if ( !sl->sl_num ) {
1432                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1433                 return;
1434         }
1435
1436         num = sl->sl_num;
1437         i = 0;
1438         nmods = 0;
1439
1440         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1441                 num * UUID_LEN, op->o_tmpmemctx );
1442         uuids[0].bv_val = (char *)(uuids + num + 1);
1443
1444         delcsn[0].bv_len = 0;
1445         delcsn[0].bv_val = cbuf;
1446         BER_BVZERO(&delcsn[1]);
1447
1448         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1449          * and everything else at the end. Do this first so we can
1450          * unlock the list mutex.
1451          */
1452         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1453                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1454         for ( se=sl->sl_head; se; se=se->se_next ) {
1455                 int k;
1456                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1457                 ndel = 1;
1458                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1459                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1460                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1461                                 break;
1462                         }
1463                 }
1464                 if ( ndel <= 0 ) {
1465                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1466                         continue;
1467                 }
1468                 ndel = 0;
1469                 for ( k=0; k<numcsns; k++ ) {
1470                         if ( se->se_sid == sids[k] ) {
1471                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1472                                 break;
1473                         }
1474                 }
1475                 if ( ndel > 0 ) {
1476                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1477                         break;
1478                 }
1479                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1480                         j = i;
1481                         i++;
1482                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1483                         delcsn[0].bv_len = se->se_csn.bv_len;
1484                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1485                 } else {
1486                         nmods++;
1487                         j = num - nmods;
1488                 }
1489                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1490                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1491                 uuids[j].bv_len = UUID_LEN;
1492         }
1493         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1494
1495         ndel = i;
1496
1497         /* Zero out unused slots */
1498         for ( i=ndel; i < num - nmods; i++ )
1499                 uuids[i].bv_len = 0;
1500
1501         /* Mods must be validated to see if they belong in this delete set.
1502          */
1503
1504         mmods = nmods;
1505         /* Strip any duplicates */
1506         for ( i=0; i<nmods; i++ ) {
1507                 for ( j=0; j<ndel; j++ ) {
1508                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1509                                 uuids[num - 1 - i].bv_len = 0;
1510                                 mmods --;
1511                                 break;
1512                         }
1513                 }
1514                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1515                 for ( j=0; j<i; j++ ) {
1516                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1517                                 uuids[num - 1 - i].bv_len = 0;
1518                                 mmods --;
1519                                 break;
1520                         }
1521                 }
1522         }
1523
1524         if ( mmods ) {
1525                 Operation fop;
1526                 SlapReply frs = { REP_RESULT };
1527                 int rc;
1528                 Filter mf, af;
1529                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1530                 slap_callback cb = {0};
1531
1532                 fop = *op;
1533
1534                 fop.o_sync_mode = 0;
1535                 fop.o_callback = &cb;
1536                 fop.ors_limit = NULL;
1537                 fop.ors_tlimit = SLAP_NO_LIMIT;
1538                 fop.ors_attrs = slap_anlist_all_attributes;
1539                 fop.ors_attrsonly = 0;
1540                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1541
1542                 af.f_choice = LDAP_FILTER_AND;
1543                 af.f_next = NULL;
1544                 af.f_and = &mf;
1545                 mf.f_choice = LDAP_FILTER_EQUALITY;
1546                 mf.f_ava = &eq;
1547                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1548                 mf.f_next = fop.ors_filter;
1549
1550                 fop.ors_filter = &af;
1551
1552                 cb.sc_response = playlog_cb;
1553                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1554
1555                 for ( i=ndel; i<num; i++ ) {
1556                         if ( uuids[i].bv_len == 0 ) continue;
1557
1558                         mf.f_av_value = uuids[i];
1559                         cb.sc_private = NULL;
1560                         fop.ors_slimit = 1;
1561                         frs.sr_nentries = 0;
1562                         rc = fop.o_bd->be_search( &fop, &frs );
1563
1564                         /* If entry was not found, add to delete list */
1565                         if ( !cb.sc_private ) {
1566                                 uuids[ndel++] = uuids[i];
1567                         }
1568                 }
1569                 fop.o_bd->bd_info = (BackendInfo *)on;
1570         }
1571         if ( ndel ) {
1572                 struct berval cookie;
1573
1574                 if ( delcsn[0].bv_len ) {
1575                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1576                                 srs->sr_state.sid );
1577
1578                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1579                 }
1580
1581                 uuids[ndel].bv_val = NULL;
1582                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1583                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1584                 if ( delcsn[0].bv_len ) {
1585                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1586                 }
1587         }
1588         op->o_tmpfree( uuids, op->o_tmpmemctx );
1589 }
1590
1591 static int
1592 syncprov_op_response( Operation *op, SlapReply *rs )
1593 {
1594         opcookie *opc = op->o_callback->sc_private;
1595         slap_overinst *on = opc->son;
1596         syncprov_info_t         *si = on->on_bi.bi_private;
1597         syncmatches *sm;
1598
1599         if ( rs->sr_err == LDAP_SUCCESS )
1600         {
1601                 struct berval maxcsn = BER_BVNULL;
1602                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1603                 int do_check = 0, have_psearches;
1604
1605                 /* Update our context CSN */
1606                 cbuf[0] = '\0';
1607                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1608                 slap_get_commit_csn( op, &maxcsn );
1609                 if ( BER_BVISNULL( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1610                         /* syncrepl queues the CSN values in the db where
1611                          * it is configured , not where the changes are made.
1612                          * So look for a value in the glue db if we didn't
1613                          * find any in this db.
1614                          */
1615                         BackendDB *be = op->o_bd;
1616                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1617                         slap_get_commit_csn( op, &maxcsn );
1618                         op->o_bd = be;
1619                 }
1620                 if ( !BER_BVISNULL( &maxcsn ) ) {
1621                         int i, sid;
1622                         strcpy( cbuf, maxcsn.bv_val );
1623                         sid = slap_parse_csn_sid( &maxcsn );
1624                         for ( i=0; i<si->si_numcsns; i++ ) {
1625                                 if ( sid == si->si_sids[i] ) {
1626                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1627                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1628                                         }
1629                                         break;
1630                                 }
1631                         }
1632                         /* It's a new SID for us */
1633                         if ( i == si->si_numcsns ) {
1634                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1635                                 si->si_numcsns++;
1636                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1637                                         sizeof(int));
1638                                 si->si_sids[i] = sid;
1639                         }
1640                 } else {
1641                         /* internal ops that aren't meant to be replicated */
1642                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1643                         return SLAP_CB_CONTINUE;
1644                 }
1645
1646                 /* Don't do any processing for consumer contextCSN updates */
1647                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1648                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1649                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1650                         return SLAP_CB_CONTINUE;
1651                 }
1652
1653                 si->si_numops++;
1654                 if ( si->si_chkops || si->si_chktime ) {
1655                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1656                                 do_check = 1;
1657                                 si->si_numops = 0;
1658                         }
1659                         if ( si->si_chktime &&
1660                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1661                                 if ( si->si_chklast ) {
1662                                         do_check = 1;
1663                                         si->si_chklast = op->o_time;
1664                                 } else {
1665                                         si->si_chklast = 1;
1666                                 }
1667                         }
1668                 }
1669                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1670
1671                 if ( do_check ) {
1672                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1673                         syncprov_checkpoint( op, rs, on );
1674                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1675                 }
1676
1677                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1678                 opc->sctxcsn.bv_val = cbuf;
1679
1680                 /* Handle any persistent searches */
1681                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1682                 have_psearches = ( si->si_ops != NULL );
1683                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1684                 if ( have_psearches ) {
1685                         switch(op->o_tag) {
1686                         case LDAP_REQ_ADD:
1687                         case LDAP_REQ_MODIFY:
1688                         case LDAP_REQ_MODRDN:
1689                         case LDAP_REQ_EXTENDED:
1690                                 syncprov_matchops( op, opc, 0 );
1691                                 break;
1692                         case LDAP_REQ_DELETE:
1693                                 /* for each match in opc->smatches:
1694                                  *   send DELETE msg
1695                                  */
1696                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1697                                         if ( sm->sm_op->s_op->o_abandon )
1698                                                 continue;
1699                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1700                                 }
1701                                 break;
1702                         }
1703                 }
1704
1705                 /* Add any log records */
1706                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1707                         syncprov_add_slog( op );
1708                 }
1709
1710         }
1711         return SLAP_CB_CONTINUE;
1712 }
1713
1714 /* We don't use a subentry to store the context CSN any more.
1715  * We expose the current context CSN as an operational attribute
1716  * of the suffix entry.
1717  */
1718 static int
1719 syncprov_op_compare( Operation *op, SlapReply *rs )
1720 {
1721         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1722         syncprov_info_t         *si = on->on_bi.bi_private;
1723         int rc = SLAP_CB_CONTINUE;
1724
1725         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1726                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1727         {
1728                 Entry e = {0};
1729                 Attribute a = {0};
1730
1731                 e.e_name = op->o_bd->be_suffix[0];
1732                 e.e_nname = op->o_bd->be_nsuffix[0];
1733                 e.e_attrs = &a;
1734
1735                 a.a_desc = slap_schema.si_ad_contextCSN;
1736
1737                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1738
1739                 a.a_vals = si->si_ctxcsn;
1740                 a.a_nvals = a.a_vals;
1741
1742                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1743                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1744                 if ( ! rs->sr_err ) {
1745                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1746                         goto return_results;
1747                 }
1748
1749                 if ( get_assert( op ) &&
1750                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1751                 {
1752                         rs->sr_err = LDAP_ASSERTION_FAILED;
1753                         goto return_results;
1754                 }
1755
1756
1757                 rs->sr_err = LDAP_COMPARE_FALSE;
1758
1759                 if ( attr_valfind( &a,
1760                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1761                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1762                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1763                 {
1764                         rs->sr_err = LDAP_COMPARE_TRUE;
1765                 }
1766
1767 return_results:;
1768
1769                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1770
1771                 send_ldap_result( op, rs );
1772
1773                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1774                         rs->sr_err = LDAP_SUCCESS;
1775                 }
1776                 rc = rs->sr_err;
1777         }
1778
1779         return rc;
1780 }
1781
1782 static int
1783 syncprov_op_mod( Operation *op, SlapReply *rs )
1784 {
1785         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1786         syncprov_info_t         *si = on->on_bi.bi_private;
1787         slap_callback *cb;
1788         opcookie *opc;
1789         int have_psearches, cbsize;
1790
1791         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1792         have_psearches = ( si->si_ops != NULL );
1793         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1794
1795         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1796                 (have_psearches ? sizeof(modinst) : 0 );
1797
1798         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1799         opc = (opcookie *)(cb+1);
1800         opc->son = on;
1801         cb->sc_response = syncprov_op_response;
1802         cb->sc_cleanup = syncprov_op_cleanup;
1803         cb->sc_private = opc;
1804         cb->sc_next = op->o_callback;
1805         op->o_callback = cb;
1806
1807         /* If there are active persistent searches, lock this operation.
1808          * See seqmod.c for the locking logic on its own.
1809          */
1810         if ( have_psearches ) {
1811                 modtarget *mt, mtdummy;
1812                 modinst *mi;
1813
1814                 mi = (modinst *)(opc+1);
1815                 mi->mi_op = op;
1816
1817                 /* See if we're already modifying this entry... */
1818                 mtdummy.mt_op = op;
1819                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1820                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1821                 if ( mt ) {
1822                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1823                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1824                         mt->mt_tail->mi_next = mi;
1825                         mt->mt_tail = mi;
1826                         /* wait for this op to get to head of list */
1827                         while ( mt->mt_mods != mi ) {
1828                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1829                                 /* FIXME: if dynamic config can delete overlays or
1830                                  * databases we'll have to check for cleanup here.
1831                                  * Currently it's not an issue because there are
1832                                  * no dynamic config deletes...
1833                                  */
1834                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1835                                         ldap_pvt_thread_yield();
1836                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1837
1838                                 /* clean up if the caller is giving up */
1839                                 if ( op->o_abandon ) {
1840                                         modinst *m2;
1841                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1842                                                 m2 = m2->mi_next );
1843                                         m2->mi_next = mi->mi_next;
1844                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1845                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1846                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1847                                         return SLAPD_ABANDON;
1848                                 }
1849                         }
1850                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1851                 } else {
1852                         /* Record that we're modifying this entry now */
1853                         mt = ch_malloc( sizeof(modtarget) );
1854                         mt->mt_mods = mi;
1855                         mt->mt_tail = mi;
1856                         mt->mt_op = mi->mi_op;
1857                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1858                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1859                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1860                 }
1861         }
1862
1863         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1864                 syncprov_matchops( op, opc, 1 );
1865
1866         return SLAP_CB_CONTINUE;
1867 }
1868
1869 static int
1870 syncprov_op_extended( Operation *op, SlapReply *rs )
1871 {
1872         if ( exop_is_write( op ))
1873                 return syncprov_op_mod( op, rs );
1874
1875         return SLAP_CB_CONTINUE;
1876 }
1877
1878 typedef struct searchstate {
1879         slap_overinst *ss_on;
1880         syncops *ss_so;
1881         BerVarray ss_ctxcsn;
1882         int *ss_sids;
1883         int ss_numcsns;
1884 #define SS_PRESENT      0x01
1885 #define SS_CHANGED      0x02
1886         int ss_flags;
1887 } searchstate;
1888
1889 static int
1890 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1891 {
1892         if ( rs->sr_ctrls ) {
1893                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1894                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1895                 rs->sr_ctrls = NULL;
1896         }
1897         return 0;
1898 }
1899
1900 typedef struct SyncOperationBuffer {
1901         Operation               sob_op;
1902         Opheader                sob_hdr;
1903         OpExtra                 sob_oe;
1904         AttributeName   sob_extra;      /* not always present */
1905         /* Further data allocated here */
1906 } SyncOperationBuffer;
1907
1908 static void
1909 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1910 {
1911         SyncOperationBuffer *sopbuf2;
1912         Operation *op2;
1913         int i, alen = 0;
1914         size_t size;
1915         char *ptr;
1916         GroupAssertion *g1, *g2;
1917
1918         /* count the search attrs */
1919         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1920                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1921         }
1922         /* Make a new copy of the operation */
1923         size = offsetof( SyncOperationBuffer, sob_extra ) +
1924                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1925                 op->o_req_dn.bv_len + 1 +
1926                 op->o_req_ndn.bv_len + 1 +
1927                 op->o_ndn.bv_len + 1 +
1928                 so->s_filterstr.bv_len + 1;
1929         sopbuf2 = ch_calloc( 1, size );
1930         op2 = &sopbuf2->sob_op;
1931         op2->o_hdr = &sopbuf2->sob_hdr;
1932         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1933
1934         /* Copy the fields we care about explicitly, leave the rest alone */
1935         *op2->o_hdr = *op->o_hdr;
1936         op2->o_tag = op->o_tag;
1937         op2->o_time = op->o_time;
1938         op2->o_bd = on->on_info->oi_origdb;
1939         op2->o_request = op->o_request;
1940         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
1941         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
1942
1943         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1944         if ( i ) {
1945                 op2->ors_attrs = (AttributeName *) ptr;
1946                 ptr = (char *) &op2->ors_attrs[i+1];
1947                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1948                         op2->ors_attrs[i] = op->ors_attrs[i];
1949                         op2->ors_attrs[i].an_name.bv_val = ptr;
1950                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1951                 }
1952                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1953         }
1954
1955         op2->o_authz = op->o_authz;
1956         op2->o_ndn.bv_val = ptr;
1957         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1958         op2->o_dn = op2->o_ndn;
1959         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1960         op2->o_req_dn.bv_val = ptr;
1961         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1962         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1963         op2->o_req_ndn.bv_val = ptr;
1964         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1965         op2->ors_filterstr.bv_val = ptr;
1966         strcpy( ptr, so->s_filterstr.bv_val );
1967         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1968
1969         /* Skip the AND/GE clause that we stuck on in front */
1970         if ( so->s_flags & PS_FIX_FILTER ) {
1971                 op2->ors_filter = op->ors_filter->f_and->f_next;
1972                 so->s_flags ^= PS_FIX_FILTER;
1973         } else {
1974                 op2->ors_filter = op->ors_filter;
1975         }
1976         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1977         so->s_op = op2;
1978
1979         /* Copy any cached group ACLs individually */
1980         op2->o_groups = NULL;
1981         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1982                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1983                 *g2 = *g1;
1984                 strcpy( g2->ga_ndn, g1->ga_ndn );
1985                 g2->ga_next = op2->o_groups;
1986                 op2->o_groups = g2;
1987         }
1988         /* Don't allow any further group caching */
1989         op2->o_do_not_cache = 1;
1990
1991         /* Add op2 to conn so abandon will find us */
1992         op->o_conn->c_n_ops_executing++;
1993         op->o_conn->c_n_ops_completed--;
1994         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1995         so->s_flags |= PS_IS_DETACHED;
1996
1997         /* Prevent anyone else from trying to send a result for this op */
1998         op->o_abandon = 1;
1999 }
2000
2001 static int
2002 syncprov_search_response( Operation *op, SlapReply *rs )
2003 {
2004         searchstate *ss = op->o_callback->sc_private;
2005         slap_overinst *on = ss->ss_on;
2006         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2007         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2008
2009         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2010                 Attribute *a;
2011                 /* If we got a referral without a referral object, there's
2012                  * something missing that we cannot replicate. Just ignore it.
2013                  * The consumer will abort because we didn't send the expected
2014                  * control.
2015                  */
2016                 if ( !rs->sr_entry ) {
2017                         assert( rs->sr_entry != NULL );
2018                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2019                         return SLAP_CB_CONTINUE;
2020                 }
2021                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2022                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2023                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2024                 }
2025                 if ( a ) {
2026                         int i, sid;
2027                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2028
2029                         /* Don't send changed entries back to the originator */
2030                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2031                                 Debug( LDAP_DEBUG_SYNC,
2032                                         "Entry %s changed by peer, ignored\n",
2033                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2034                                 return LDAP_SUCCESS;
2035                         }
2036
2037                         /* If not a persistent search */
2038                         if ( !ss->ss_so ) {
2039                                 /* Make sure entry is less than the snapshot'd contextCSN */
2040                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2041                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2042                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2043                                                 Debug( LDAP_DEBUG_SYNC,
2044                                                         "Entry %s CSN %s greater than snapshot %s\n",
2045                                                         rs->sr_entry->e_name.bv_val,
2046                                                         a->a_nvals[0].bv_val,
2047                                                         ss->ss_ctxcsn[i].bv_val );
2048                                                 return LDAP_SUCCESS;
2049                                         }
2050                                 }
2051                         }
2052
2053                         /* Don't send old entries twice */
2054                         if ( srs->sr_state.ctxcsn ) {
2055                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2056                                         if ( sid == srs->sr_state.sids[i] &&
2057                                                 ber_bvcmp( &a->a_nvals[0],
2058                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2059                                                 Debug( LDAP_DEBUG_SYNC,
2060                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2061                                                         rs->sr_entry->e_name.bv_val,
2062                                                         a->a_nvals[0].bv_val,
2063                                                         srs->sr_state.ctxcsn[i].bv_val );
2064                                                 return LDAP_SUCCESS;
2065                                         }
2066                                 }
2067                         }
2068                 }
2069                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2070                         op->o_tmpmemctx );
2071                 rs->sr_ctrls[1] = NULL;
2072                 /* If we're in delta-sync mode, always send a cookie */
2073                 if ( si->si_nopres && si->si_usehint && a ) {
2074                         struct berval cookie;
2075                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2076                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2077                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2078                 } else {
2079                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2080                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2081                 }
2082         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2083                 struct berval cookie;
2084
2085                 if ( ss->ss_flags & SS_CHANGED ) {
2086                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2087                                 srs->sr_state.rid, srs->sr_state.sid );
2088
2089                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2090                 }
2091
2092                 /* Is this a regular refresh?
2093                  * Note: refresh never gets here if there were no changes
2094                  */
2095                 if ( !ss->ss_so ) {
2096                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2097                                 op->o_tmpmemctx );
2098                         rs->sr_ctrls[1] = NULL;
2099                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2100                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2101                                         LDAP_SYNC_REFRESH_DELETES );
2102                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2103                 } else {
2104                 /* It's RefreshAndPersist, transition to Persist phase */
2105                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2106                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2107                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2108                                 1, NULL, 0 );
2109                         if ( ss->ss_flags & SS_CHANGED )
2110                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2111
2112                         /* Detach this Op from frontend control */
2113                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2114                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2115
2116                         /* But not if this connection was closed along the way */
2117                         if ( op->o_abandon ) {
2118                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2119                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2120                                 /* syncprov_ab_cleanup will free this syncop */
2121                                 return SLAPD_ABANDON;
2122
2123                         } else {
2124                                 /* Turn off the refreshing flag */
2125                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2126
2127                                 syncprov_detach_op( op, ss->ss_so, on );
2128
2129                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2130
2131                                 /* If there are queued responses, fire them off */
2132                                 if ( ss->ss_so->s_res )
2133                                         syncprov_qstart( ss->ss_so );
2134                         }
2135                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2136
2137                         return LDAP_SUCCESS;
2138                 }
2139         }
2140
2141         return SLAP_CB_CONTINUE;
2142 }
2143
2144 static int
2145 syncprov_op_search( Operation *op, SlapReply *rs )
2146 {
2147         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2148         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2149         slap_callback   *cb;
2150         int gotstate = 0, changed = 0, do_present = 0;
2151         syncops *sop = NULL;
2152         searchstate *ss;
2153         sync_control *srs;
2154         BerVarray ctxcsn;
2155         int i, *sids, numcsns;
2156         struct berval mincsn;
2157
2158         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2159
2160         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2161                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2162                 return rs->sr_err;
2163         }
2164
2165         srs = op->o_controls[slap_cids.sc_LDAPsync];
2166         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2167
2168         /* If this is a persistent search, set it up right away */
2169         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2170                 syncops so = {0};
2171                 fbase_cookie fc;
2172                 opcookie opc;
2173                 slap_callback sc;
2174
2175                 fc.fss = &so;
2176                 fc.fbase = 0;
2177                 so.s_eid = NOID;
2178                 so.s_op = op;
2179                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2180                 /* syncprov_findbase expects to be called as a callback... */
2181                 sc.sc_private = &opc;
2182                 opc.son = on;
2183                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2184                 cb = op->o_callback;
2185                 op->o_callback = &sc;
2186                 rs->sr_err = syncprov_findbase( op, &fc );
2187                 op->o_callback = cb;
2188                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2189
2190                 if ( rs->sr_err != LDAP_SUCCESS ) {
2191                         send_ldap_result( op, rs );
2192                         return rs->sr_err;
2193                 }
2194                 sop = ch_malloc( sizeof( syncops ));
2195                 *sop = so;
2196                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2197                 sop->s_rid = srs->sr_state.rid;
2198                 sop->s_sid = srs->sr_state.sid;
2199                 sop->s_inuse = 1;
2200
2201                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2202                 sop->s_next = si->si_ops;
2203                 si->si_ops = sop;
2204                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2205         }
2206
2207         /* snapshot the ctxcsn */
2208         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2209         numcsns = si->si_numcsns;
2210         if ( numcsns ) {
2211                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2212                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2213                 for ( i=0; i<numcsns; i++ )
2214                         sids[i] = si->si_sids[i];
2215         } else {
2216                 ctxcsn = NULL;
2217                 sids = NULL;
2218         }
2219         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2220
2221         /* If we have a cookie, handle the PRESENT lookups */
2222         if ( srs->sr_state.ctxcsn ) {
2223                 sessionlog *sl;
2224                 int i, j;
2225
2226                 /* If we don't have any CSN of our own yet, pretend nothing
2227                  * has changed.
2228                  */
2229                 if ( !numcsns )
2230                         goto no_change;
2231
2232                 if ( !si->si_nopres )
2233                         do_present = SS_PRESENT;
2234
2235                 /* If there are SIDs we don't recognize in the cookie, drop them */
2236                 for (i=0; i<srs->sr_state.numcsns; ) {
2237                         for (j=0; j<numcsns; j++) {
2238                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2239                                         break;
2240                                 }
2241                         }
2242                         /* not found */
2243                         if ( j == numcsns ) {
2244                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2245                                 j = srs->sr_state.numcsns - 1;
2246                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2247                                 tmp.bv_len = 0;
2248                                 srs->sr_state.ctxcsn[j] = tmp;
2249                                 srs->sr_state.numcsns = j;
2250                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2251                                 continue;
2252                         }
2253                         i++;
2254                 }
2255
2256                 /* Find the smallest CSN */
2257                 mincsn = srs->sr_state.ctxcsn[0];
2258                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2259                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2260                                 mincsn = srs->sr_state.ctxcsn[i];
2261                 }
2262
2263                 /* If nothing has changed, shortcut it */
2264                 if ( srs->sr_state.numcsns == numcsns ) {
2265                         int i, j;
2266                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2267                                 for ( j=0; j<numcsns; j++ ) {
2268                                         if ( srs->sr_state.sids[i] != sids[j] )
2269                                                 continue;
2270                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2271                                                 changed = SS_CHANGED;
2272                                         break;
2273                                 }
2274                                 if ( changed )
2275                                         break;
2276                         }
2277                         if ( !changed ) {
2278                                 do_present = 0;
2279 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2280                                         LDAPControl     *ctrls[2];
2281
2282                                         ctrls[0] = NULL;
2283                                         ctrls[1] = NULL;
2284                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2285                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2286                                         rs->sr_ctrls = ctrls;
2287                                         rs->sr_err = LDAP_SUCCESS;
2288                                         send_ldap_result( op, rs );
2289                                         rs->sr_ctrls = NULL;
2290                                         return rs->sr_err;
2291                                 }
2292                                 goto shortcut;
2293                         }
2294                 } else {
2295                         /* consumer doesn't have the right number of CSNs */
2296                         changed = SS_CHANGED;
2297                 }
2298                 /* Do we have a sessionlog for this search? */
2299                 sl=si->si_logs;
2300                 if ( sl ) {
2301                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2302                         /* Are there any log entries, and is the consumer state
2303                          * present in the session log?
2304                          */
2305                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2306                                 do_present = 0;
2307                                 /* mutex is unlocked in playlog */
2308                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2309                         } else {
2310                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2311                         }
2312                 }
2313                 /* Is the CSN still present in the database? */
2314                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2315                         /* No, so a reload is required */
2316                         /* the 2.2 consumer doesn't send this hint */
2317                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2318                                 if ( ctxcsn )
2319                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2320                                 if ( sids )
2321                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2322                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2323                                 return rs->sr_err;
2324                         }
2325                         if ( srs->sr_state.ctxcsn ) {
2326                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2327                                 srs->sr_state.ctxcsn = NULL;
2328                         }
2329                         if ( srs->sr_state.sids ) {
2330                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2331                                 srs->sr_state.sids = NULL;
2332                         }
2333                         srs->sr_state.numcsns = 0;
2334                 } else {
2335                         gotstate = 1;
2336                         /* If changed and doing Present lookup, send Present UUIDs */
2337                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2338                                 LDAP_SUCCESS ) {
2339                                 if ( ctxcsn )
2340                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2341                                 if ( sids )
2342                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2343                                 send_ldap_result( op, rs );
2344                                 return rs->sr_err;
2345                         }
2346                 }
2347         } else {
2348                 /* No consumer state, assume something has changed */
2349                 changed = SS_CHANGED;
2350         }
2351
2352 shortcut:
2353         /* Append CSN range to search filter, save original filter
2354          * for persistent search evaluation
2355          */
2356         if ( sop ) {
2357                 sop->s_filterstr= op->ors_filterstr;
2358         }
2359
2360         /* If something changed, find the changes */
2361         if ( gotstate && changed ) {
2362                 Filter *fand, *fava;
2363
2364                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2365                 fand->f_choice = LDAP_FILTER_AND;
2366                 fand->f_next = NULL;
2367                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2368                 fand->f_and = fava;
2369                 fava->f_choice = LDAP_FILTER_GE;
2370                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2371                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2372 #ifdef LDAP_COMP_MATCH
2373                 fava->f_ava->aa_cf = NULL;
2374 #endif
2375                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2376                 fava->f_next = op->ors_filter;
2377                 op->ors_filter = fand;
2378                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2379                 if ( sop )
2380                         sop->s_flags |= PS_FIX_FILTER;
2381         }
2382
2383         /* Let our callback add needed info to returned entries */
2384         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2385         ss = (searchstate *)(cb+1);
2386         ss->ss_on = on;
2387         ss->ss_so = sop;
2388         ss->ss_flags = do_present | changed;
2389         ss->ss_ctxcsn = ctxcsn;
2390         ss->ss_numcsns = numcsns;
2391         ss->ss_sids = sids;
2392         cb->sc_response = syncprov_search_response;
2393         cb->sc_cleanup = syncprov_search_cleanup;
2394         cb->sc_private = ss;
2395         cb->sc_next = op->o_callback;
2396         op->o_callback = cb;
2397
2398         /* If this is a persistent search and no changes were reported during
2399          * the refresh phase, just invoke the response callback to transition
2400          * us into persist phase
2401          */
2402         if ( !changed ) {
2403                 rs->sr_err = LDAP_SUCCESS;
2404                 rs->sr_nentries = 0;
2405                 send_ldap_result( op, rs );
2406                 return rs->sr_err;
2407         }
2408         return SLAP_CB_CONTINUE;
2409 }
2410
2411 static int
2412 syncprov_operational(
2413         Operation *op,
2414         SlapReply *rs )
2415 {
2416         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2417         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2418
2419         /* This prevents generating unnecessarily; frontend will strip
2420          * any statically stored copy.
2421          */
2422         if ( op->o_sync != SLAP_CONTROL_NONE )
2423                 return SLAP_CB_CONTINUE;
2424
2425         if ( rs->sr_entry &&
2426                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2427
2428                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2429                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2430                         Attribute *a, **ap = NULL;
2431
2432                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2433                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2434                                         break;
2435                         }
2436
2437                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2438                         if ( si->si_ctxcsn ) {
2439                                 if ( !a ) {
2440                                         for ( ap = &rs->sr_operational_attrs; *ap;
2441                                                 ap=&(*ap)->a_next );
2442
2443                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2444                                         *ap = a;
2445                                 }
2446
2447                                 if ( !ap ) {
2448                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2449                                                 Entry *e = entry_dup( rs->sr_entry );
2450                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2451                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2452                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2453                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2454                                                         entry_free( rs->sr_entry );
2455                                                 }
2456                                                 rs->sr_entry = e;
2457                                                 rs->sr_flags |=
2458                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2459                                                 a = attr_find( rs->sr_entry->e_attrs,
2460                                                         slap_schema.si_ad_contextCSN );
2461                                         }
2462                                         if ( a->a_nvals != a->a_vals ) {
2463                                                 ber_bvarray_free( a->a_nvals );
2464                                         }
2465                                         a->a_nvals = NULL;
2466                                         ber_bvarray_free( a->a_vals );
2467                                         a->a_vals = NULL;
2468                                         a->a_numvals = 0;
2469                                 }
2470                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2471                         }
2472                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2473                 }
2474         }
2475         return SLAP_CB_CONTINUE;
2476 }
2477
2478 enum {
2479         SP_CHKPT = 1,
2480         SP_SESSL,
2481         SP_NOPRES,
2482         SP_USEHINT
2483 };
2484
2485 static ConfigDriver sp_cf_gen;
2486
2487 static ConfigTable spcfg[] = {
2488         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2489                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2490                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2491                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2492         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2493                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2494                         "DESC 'Session log size in ops' "
2495                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2496         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2497                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2498                         "DESC 'Omit Present phase processing' "
2499                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2500         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2501                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2502                         "DESC 'Observe Reload Hint in Request control' "
2503                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2504         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2505 };
2506
2507 static ConfigOCs spocs[] = {
2508         { "( OLcfgOvOc:1.1 "
2509                 "NAME 'olcSyncProvConfig' "
2510                 "DESC 'SyncRepl Provider configuration' "
2511                 "SUP olcOverlayConfig "
2512                 "MAY ( olcSpCheckpoint "
2513                         "$ olcSpSessionlog "
2514                         "$ olcSpNoPresent "
2515                         "$ olcSpReloadHint "
2516                 ") )",
2517                         Cft_Overlay, spcfg },
2518         { NULL, 0, NULL }
2519 };
2520
2521 static int
2522 sp_cf_gen(ConfigArgs *c)
2523 {
2524         slap_overinst           *on = (slap_overinst *)c->bi;
2525         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2526         int rc = 0;
2527
2528         if ( c->op == SLAP_CONFIG_EMIT ) {
2529                 switch ( c->type ) {
2530                 case SP_CHKPT:
2531                         if ( si->si_chkops || si->si_chktime ) {
2532                                 struct berval bv;
2533                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2534                                         "%d %d", si->si_chkops, si->si_chktime );
2535                                 if ( bv.bv_len < 0 || bv.bv_len >= sizeof( c->cr_msg ) ) {
2536                                         rc = 1;
2537                                 } else {
2538                                         bv.bv_val = c->cr_msg;
2539                                         value_add_one( &c->rvalue_vals, &bv );
2540                                 }
2541                         } else {
2542                                 rc = 1;
2543                         }
2544                         break;
2545                 case SP_SESSL:
2546                         if ( si->si_logs ) {
2547                                 c->value_int = si->si_logs->sl_size;
2548                         } else {
2549                                 rc = 1;
2550                         }
2551                         break;
2552                 case SP_NOPRES:
2553                         if ( si->si_nopres ) {
2554                                 c->value_int = 1;
2555                         } else {
2556                                 rc = 1;
2557                         }
2558                         break;
2559                 case SP_USEHINT:
2560                         if ( si->si_usehint ) {
2561                                 c->value_int = 1;
2562                         } else {
2563                                 rc = 1;
2564                         }
2565                         break;
2566                 }
2567                 return rc;
2568         } else if ( c->op == LDAP_MOD_DELETE ) {
2569                 switch ( c->type ) {
2570                 case SP_CHKPT:
2571                         si->si_chkops = 0;
2572                         si->si_chktime = 0;
2573                         break;
2574                 case SP_SESSL:
2575                         if ( si->si_logs )
2576                                 si->si_logs->sl_size = 0;
2577                         else
2578                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2579                         break;
2580                 case SP_NOPRES:
2581                         if ( si->si_nopres )
2582                                 si->si_nopres = 0;
2583                         else
2584                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2585                         break;
2586                 case SP_USEHINT:
2587                         if ( si->si_usehint )
2588                                 si->si_usehint = 0;
2589                         else
2590                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2591                         break;
2592                 }
2593                 return rc;
2594         }
2595         switch ( c->type ) {
2596         case SP_CHKPT:
2597                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2598                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2599                                 c->argv[0], c->argv[1] );
2600                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2601                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2602                         return ARG_BAD_CONF;
2603                 }
2604                 if ( si->si_chkops <= 0 ) {
2605                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2606                                 c->argv[0], si->si_chkops );
2607                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2608                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2609                         return ARG_BAD_CONF;
2610                 }
2611                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2612                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2613                                 c->argv[0], c->argv[1] );
2614                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2615                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2616                         return ARG_BAD_CONF;
2617                 }
2618                 if ( si->si_chktime <= 0 ) {
2619                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2620                                 c->argv[0], si->si_chkops );
2621                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2622                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2623                         return ARG_BAD_CONF;
2624                 }
2625                 si->si_chktime *= 60;
2626                 break;
2627         case SP_SESSL: {
2628                 sessionlog *sl;
2629                 int size = c->value_int;
2630
2631                 if ( size < 0 ) {
2632                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2633                                 c->argv[0], size );
2634                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2635                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2636                         return ARG_BAD_CONF;
2637                 }
2638                 sl = si->si_logs;
2639                 if ( !sl ) {
2640                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2641                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2642                         sl->sl_mincsn.bv_len = 0;
2643                         sl->sl_num = 0;
2644                         sl->sl_head = sl->sl_tail = NULL;
2645                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2646                         si->si_logs = sl;
2647                 }
2648                 sl->sl_size = size;
2649                 }
2650                 break;
2651         case SP_NOPRES:
2652                 si->si_nopres = c->value_int;
2653                 break;
2654         case SP_USEHINT:
2655                 si->si_usehint = c->value_int;
2656                 break;
2657         }
2658         return rc;
2659 }
2660
2661 /* ITS#3456 we cannot run this search on the main thread, must use a
2662  * child thread in order to insure we have a big enough stack.
2663  */
2664 static void *
2665 syncprov_db_otask(
2666         void *ptr
2667 )
2668 {
2669         syncprov_findcsn( ptr, FIND_MAXCSN );
2670         return NULL;
2671 }
2672
2673 /* Read any existing contextCSN from the underlying db.
2674  * Then search for any entries newer than that. If no value exists,
2675  * just generate it. Cache whatever result.
2676  */
2677 static int
2678 syncprov_db_open(
2679         BackendDB *be,
2680         ConfigReply *cr
2681 )
2682 {
2683         slap_overinst   *on = (slap_overinst *) be->bd_info;
2684         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2685
2686         Connection conn = { 0 };
2687         OperationBuffer opbuf;
2688         Operation *op;
2689         Entry *e = NULL;
2690         Attribute *a;
2691         int rc;
2692         void *thrctx = NULL;
2693
2694         if ( !SLAP_LASTMOD( be )) {
2695                 Debug( LDAP_DEBUG_ANY,
2696                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2697                 return -1;
2698         }
2699
2700         if ( slapMode & SLAP_TOOL_MODE ) {
2701                 return 0;
2702         }
2703
2704         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2705         if ( rc ) {
2706                 return rc;
2707         }
2708
2709         thrctx = ldap_pvt_thread_pool_context();
2710         connection_fake_init( &conn, &opbuf, thrctx );
2711         op = &opbuf.ob_op;
2712         op->o_bd = be;
2713         op->o_dn = be->be_rootdn;
2714         op->o_ndn = be->be_rootndn;
2715
2716         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2717                 slap_schema.si_ad_contextCSN, 0, &e, on );
2718
2719         if ( e ) {
2720                 ldap_pvt_thread_t tid;
2721
2722                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2723                 if ( a ) {
2724                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2725                         si->si_numcsns = a->a_numvals;
2726                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2727                 }
2728                 overlay_entry_release_ov( op, e, 0, on );
2729                 if ( si->si_ctxcsn ) {
2730                         op->o_req_dn = be->be_suffix[0];
2731                         op->o_req_ndn = be->be_nsuffix[0];
2732                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2733                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2734                         ldap_pvt_thread_join( tid, NULL );
2735                 }
2736         }
2737
2738         /* Didn't find a contextCSN, should we generate one? */
2739         if ( !si->si_ctxcsn ) {
2740                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2741                 struct berval csn;
2742
2743                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2744                 /* If we're also a consumer, then don't generate anything.
2745                  * Wait for our provider to send it to us, or for a local
2746                  * modify if we have multimaster.
2747                  */
2748                         goto out;
2749                 }
2750                 csn.bv_val = csnbuf;
2751                 csn.bv_len = sizeof( csnbuf );
2752                 slap_get_csn( op, &csn, 0 );
2753                 value_add_one( &si->si_ctxcsn, &csn );
2754                 si->si_numcsns = 1;
2755                 si->si_sids = ch_malloc( sizeof(int) );
2756                 si->si_sids[0] = slap_serverID;
2757
2758                 /* make sure we do a checkpoint on close */
2759                 si->si_numops++;
2760         }
2761
2762 out:
2763         op->o_bd->bd_info = (BackendInfo *)on;
2764         return 0;
2765 }
2766
2767 /* Write the current contextCSN into the underlying db.
2768  */
2769 static int
2770 syncprov_db_close(
2771         BackendDB *be,
2772         ConfigReply *cr
2773 )
2774 {
2775     slap_overinst   *on = (slap_overinst *) be->bd_info;
2776     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2777
2778         if ( slapMode & SLAP_TOOL_MODE ) {
2779                 return 0;
2780         }
2781         if ( si->si_numops ) {
2782                 Connection conn = {0};
2783                 OperationBuffer opbuf;
2784                 Operation *op;
2785                 SlapReply rs = {REP_RESULT};
2786                 void *thrctx;
2787
2788                 thrctx = ldap_pvt_thread_pool_context();
2789                 connection_fake_init( &conn, &opbuf, thrctx );
2790                 op = &opbuf.ob_op;
2791                 op->o_bd = be;
2792                 op->o_dn = be->be_rootdn;
2793                 op->o_ndn = be->be_rootndn;
2794                 syncprov_checkpoint( op, &rs, on );
2795         }
2796
2797     return 0;
2798 }
2799
2800 static int
2801 syncprov_db_init(
2802         BackendDB *be,
2803         ConfigReply *cr
2804 )
2805 {
2806         slap_overinst   *on = (slap_overinst *)be->bd_info;
2807         syncprov_info_t *si;
2808
2809         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2810                 Debug( LDAP_DEBUG_ANY,
2811                         "syncprov must be instantiated within a database.\n",
2812                         0, 0, 0 );
2813                 return 1;
2814         }
2815
2816         si = ch_calloc(1, sizeof(syncprov_info_t));
2817         on->on_bi.bi_private = si;
2818         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2819         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2820         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2821
2822         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2823         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2824         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2825         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2826
2827         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2828         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2829
2830         return 0;
2831 }
2832
2833 static int
2834 syncprov_db_destroy(
2835         BackendDB *be,
2836         ConfigReply *cr
2837 )
2838 {
2839         slap_overinst   *on = (slap_overinst *)be->bd_info;
2840         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2841
2842         if ( si ) {
2843                 if ( si->si_logs ) {
2844                         slog_entry *se = si->si_logs->sl_head;
2845
2846                         while ( se ) {
2847                                 slog_entry *se_next = se->se_next;
2848                                 ch_free( se );
2849                                 se = se_next;
2850                         }
2851
2852                         ch_free( si->si_logs );
2853                 }
2854                 if ( si->si_ctxcsn )
2855                         ber_bvarray_free( si->si_ctxcsn );
2856                 if ( si->si_sids )
2857                         ch_free( si->si_sids );
2858                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2859                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2860                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2861                 ch_free( si );
2862         }
2863
2864         return 0;
2865 }
2866
2867 static int syncprov_parseCtrl (
2868         Operation *op,
2869         SlapReply *rs,
2870         LDAPControl *ctrl )
2871 {
2872         ber_tag_t tag;
2873         BerElementBuffer berbuf;
2874         BerElement *ber = (BerElement *)&berbuf;
2875         ber_int_t mode;
2876         ber_len_t len;
2877         struct berval cookie = BER_BVNULL;
2878         sync_control *sr;
2879         int rhint = 0;
2880
2881         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2882                 rs->sr_text = "Sync control specified multiple times";
2883                 return LDAP_PROTOCOL_ERROR;
2884         }
2885
2886         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2887                 rs->sr_text = "Sync control specified with pagedResults control";
2888                 return LDAP_PROTOCOL_ERROR;
2889         }
2890
2891         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2892                 rs->sr_text = "Sync control value is absent";
2893                 return LDAP_PROTOCOL_ERROR;
2894         }
2895
2896         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2897                 rs->sr_text = "Sync control value is empty";
2898                 return LDAP_PROTOCOL_ERROR;
2899         }
2900
2901         /* Parse the control value
2902          *      syncRequestValue ::= SEQUENCE {
2903          *              mode   ENUMERATED {
2904          *                      -- 0 unused
2905          *                      refreshOnly             (1),
2906          *                      -- 2 reserved
2907          *                      refreshAndPersist       (3)
2908          *              },
2909          *              cookie  syncCookie OPTIONAL
2910          *      }
2911          */
2912
2913         ber_init2( ber, &ctrl->ldctl_value, 0 );
2914
2915         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2916                 rs->sr_text = "Sync control : mode decoding error";
2917                 return LDAP_PROTOCOL_ERROR;
2918         }
2919
2920         switch( mode ) {
2921         case LDAP_SYNC_REFRESH_ONLY:
2922                 mode = SLAP_SYNC_REFRESH;
2923                 break;
2924         case LDAP_SYNC_REFRESH_AND_PERSIST:
2925                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2926                 break;
2927         default:
2928                 rs->sr_text = "Sync control : unknown update mode";
2929                 return LDAP_PROTOCOL_ERROR;
2930         }
2931
2932         tag = ber_peek_tag( ber, &len );
2933
2934         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2935                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2936                         rs->sr_text = "Sync control : cookie decoding error";
2937                         return LDAP_PROTOCOL_ERROR;
2938                 }
2939                 tag = ber_peek_tag( ber, &len );
2940         }
2941         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2942                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2943                         rs->sr_text = "Sync control : rhint decoding error";
2944                         return LDAP_PROTOCOL_ERROR;
2945                 }
2946         }
2947         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2948                         rs->sr_text = "Sync control : decoding error";
2949                         return LDAP_PROTOCOL_ERROR;
2950         }
2951         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2952         sr->sr_rhint = rhint;
2953         if (!BER_BVISNULL(&cookie)) {
2954                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2955                 /* If parse fails, pretend no cookie was sent */
2956                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2957                         sr->sr_state.rid == -1 ) {
2958                         if ( sr->sr_state.ctxcsn ) {
2959                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2960                                 sr->sr_state.ctxcsn = NULL;
2961                         }
2962                         sr->sr_state.numcsns = 0;
2963                 }
2964         }
2965
2966         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2967
2968         op->o_sync = ctrl->ldctl_iscritical
2969                 ? SLAP_CONTROL_CRITICAL
2970                 : SLAP_CONTROL_NONCRITICAL;
2971
2972         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2973
2974         return LDAP_SUCCESS;
2975 }
2976
2977 /* This overlay is set up for dynamic loading via moduleload. For static
2978  * configuration, you'll need to arrange for the slap_overinst to be
2979  * initialized and registered by some other function inside slapd.
2980  */
2981
2982 static slap_overinst            syncprov;
2983
2984 int
2985 syncprov_initialize()
2986 {
2987         int rc;
2988
2989         rc = register_supported_control( LDAP_CONTROL_SYNC,
2990                 SLAP_CTRL_SEARCH, NULL,
2991                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2992         if ( rc != LDAP_SUCCESS ) {
2993                 Debug( LDAP_DEBUG_ANY,
2994                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2995                 return rc;
2996         }
2997
2998         syncprov.on_bi.bi_type = "syncprov";
2999         syncprov.on_bi.bi_db_init = syncprov_db_init;
3000         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3001         syncprov.on_bi.bi_db_open = syncprov_db_open;
3002         syncprov.on_bi.bi_db_close = syncprov_db_close;
3003
3004         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3005         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3006
3007         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3008         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3009         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3010         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3011         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3012         syncprov.on_bi.bi_op_search = syncprov_op_search;
3013         syncprov.on_bi.bi_extended = syncprov_op_extended;
3014         syncprov.on_bi.bi_operational = syncprov_operational;
3015
3016         syncprov.on_bi.bi_cf_ocs = spocs;
3017
3018         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3019
3020         rc = config_register_schema( spcfg, spocs );
3021         if ( rc ) return rc;
3022
3023         return overlay_register( &syncprov );
3024 }
3025
3026 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3027 int
3028 init_module( int argc, char *argv[] )
3029 {
3030         return syncprov_initialize();
3031 }
3032 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3033
3034 #endif /* defined(SLAPD_OVER_SYNCPROV) */