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