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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2009 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74
  75         int             s_inuse;        /* reference count */
  76         struct syncres *s_res;
  77         struct syncres *s_restail;
  78         struct re_s     *s_qtask;       /* task for playing psearch responses */
  79 #define RUNQ_INTERVAL   36000   /* a long time */
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         struct berval   sl_mincsn;
 117         int             sl_num;
 118         int             sl_size;
 119         slog_entry *sl_head;
 120         slog_entry *sl_tail;
 121         ldap_pvt_thread_mutex_t sl_mutex;
 122 } sessionlog;
 123
 124 /* The main state for this overlay */
 125 typedef struct syncprov_info_t {
 126         syncops         *si_ops;
 127         BerVarray       si_ctxcsn;      /* ldapsync context */
 128         int             *si_sids;
 129         int             si_numcsns;
 130         int             si_chkops;      /* checkpointing info */
 131         int             si_chktime;
 132         int             si_numops;      /* number of ops since last checkpoint */
 133         int             si_nopres;      /* Skip present phase */
 134         int             si_usehint;     /* use reload hint */
 135         time_t  si_chklast;     /* time of last checkpoint */
 136         Avlnode *si_mods;       /* entries being modified */
 137         sessionlog      *si_logs;
 138         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 139         ldap_pvt_thread_mutex_t si_ops_mutex;
 140         ldap_pvt_thread_mutex_t si_mods_mutex;
 141 } syncprov_info_t;
 142
 143 typedef struct opcookie {
 144         slap_overinst *son;
 145         syncmatches *smatches;
 146         struct berval sdn;      /* DN of entry, for deletes */
 147         struct berval sndn;
 148         struct berval suuid;    /* UUID of entry */
 149         struct berval sctxcsn;
 150         int sreference; /* Is the entry a reference? */
 151 } opcookie;
 152
 153 typedef struct fbase_cookie {
 154         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 155         syncops *fss;   /* persistent search we're testing against */
 156         int fbase;      /* if TRUE we found the search base and it's still valid */
 157         int fscope;     /* if TRUE then fdn is within the psearch scope */
 158 } fbase_cookie;
 159
 160 static AttributeName csn_anlist[3];
 161 static AttributeName uuid_anlist[2];
 162
 163 /* Build a LDAPsync intermediate state control */
 164 static int
 165 syncprov_state_ctrl(
 166         Operation       *op,
 167         SlapReply       *rs,
 168         Entry           *e,
 169         int             entry_sync_state,
 170         LDAPControl     **ctrls,
 171         int             num_ctrls,
 172         int             send_cookie,
 173         struct berval   *cookie )
 174 {
 175         Attribute* a;
 176         int ret;
 177
 178         BerElementBuffer berbuf;
 179         BerElement *ber = (BerElement *)&berbuf;
 180
 181         struct berval   entryuuid_bv = BER_BVNULL;
 182
 183         ber_init2( ber, 0, LBER_USE_DER );
 184         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 185
 186         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 187
 188         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 189                 AttributeDescription *desc = a->a_desc;
 190                 if ( desc == slap_schema.si_ad_entryUUID ) {
 191                         entryuuid_bv = a->a_nvals[0];
 192                         break;
 193                 }
 194         }
 195
 196         /* FIXME: what if entryuuid is NULL or empty ? */
 197
 198         if ( send_cookie && cookie ) {
 199                 ber_printf( ber, "{eOON}",
 200                         entry_sync_state, &entryuuid_bv, cookie );
 201         } else {
 202                 ber_printf( ber, "{eON}",
 203                         entry_sync_state, &entryuuid_bv );
 204         }
 205
 206         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 207         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 208         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 209
 210         ber_free_buf( ber );
 211
 212         if ( ret < 0 ) {
 213                 Debug( LDAP_DEBUG_TRACE,
 214                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 215                         0, 0, 0 );
 216                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 217                 return ret;
 218         }
 219
 220         return LDAP_SUCCESS;
 221 }
 222
 223 /* Build a LDAPsync final state control */
 224 static int
 225 syncprov_done_ctrl(
 226         Operation       *op,
 227         SlapReply       *rs,
 228         LDAPControl     **ctrls,
 229         int                     num_ctrls,
 230         int                     send_cookie,
 231         struct berval *cookie,
 232         int                     refreshDeletes )
 233 {
 234         int ret;
 235         BerElementBuffer berbuf;
 236         BerElement *ber = (BerElement *)&berbuf;
 237
 238         ber_init2( ber, NULL, LBER_USE_DER );
 239         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 240
 241         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 242
 243         ber_printf( ber, "{" );
 244         if ( send_cookie && cookie ) {
 245                 ber_printf( ber, "O", cookie );
 246         }
 247         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 248                 ber_printf( ber, "b", refreshDeletes );
 249         }
 250         ber_printf( ber, "N}" );
 251
 252         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 253         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 254         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 255
 256         ber_free_buf( ber );
 257
 258         if ( ret < 0 ) {
 259                 Debug( LDAP_DEBUG_TRACE,
 260                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 261                         0, 0, 0 );
 262                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 263                 return ret;
 264         }
 265
 266         return LDAP_SUCCESS;
 267 }
 268
 269 static int
 270 syncprov_sendinfo(
 271         Operation       *op,
 272         SlapReply       *rs,
 273         int                     type,
 274         struct berval *cookie,
 275         int                     refreshDone,
 276         BerVarray       syncUUIDs,
 277         int                     refreshDeletes )
 278 {
 279         BerElementBuffer berbuf;
 280         BerElement *ber = (BerElement *)&berbuf;
 281         struct berval rspdata;
 282
 283         int ret;
 284
 285         ber_init2( ber, NULL, LBER_USE_DER );
 286         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 287
 288         if ( type ) {
 289                 switch ( type ) {
 290                 case LDAP_TAG_SYNC_NEW_COOKIE:
 291                         ber_printf( ber, "tO", type, cookie );
 292                         break;
 293                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 294                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 295                         ber_printf( ber, "t{", type );
 296                         if ( cookie ) {
 297                                 ber_printf( ber, "O", cookie );
 298                         }
 299                         if ( refreshDone == 0 ) {
 300                                 ber_printf( ber, "b", refreshDone );
 301                         }
 302                         ber_printf( ber, "N}" );
 303                         break;
 304                 case LDAP_TAG_SYNC_ID_SET:
 305                         ber_printf( ber, "t{", type );
 306                         if ( cookie ) {
 307                                 ber_printf( ber, "O", cookie );
 308                         }
 309                         if ( refreshDeletes == 1 ) {
 310                                 ber_printf( ber, "b", refreshDeletes );
 311                         }
 312                         ber_printf( ber, "[W]", syncUUIDs );
 313                         ber_printf( ber, "N}" );
 314                         break;
 315                 default:
 316                         Debug( LDAP_DEBUG_TRACE,
 317                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 318                                 type, 0, 0 );
 319                         return LDAP_OTHER;
 320                 }
 321         }
 322
 323         ret = ber_flatten2( ber, &rspdata, 0 );
 324
 325         if ( ret < 0 ) {
 326                 Debug( LDAP_DEBUG_TRACE,
 327                         "syncprov_sendinfo: ber_flatten2 failed\n",
 328                         0, 0, 0 );
 329                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 330                 return ret;
 331         }
 332
 333         rs->sr_rspoid = LDAP_SYNC_INFO;
 334         rs->sr_rspdata = &rspdata;
 335         send_ldap_intermediate( op, rs );
 336         rs->sr_rspdata = NULL;
 337         ber_free_buf( ber );
 338
 339         return LDAP_SUCCESS;
 340 }
 341
 342 /* Find a modtarget in an AVL tree */
 343 static int
 344 sp_avl_cmp( const void *c1, const void *c2 )
 345 {
 346         const modtarget *m1, *m2;
 347         int rc;
 348
 349         m1 = c1; m2 = c2;
 350         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 351
 352         if ( rc ) return rc;
 353         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 354 }
 355
 356 /* syncprov_findbase:
 357  *   finds the true DN of the base of a search (with alias dereferencing) and
 358  * checks to make sure the base entry doesn't get replaced with a different
 359  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 360  * change is detected, any persistent search on this base must be terminated /
 361  * reloaded.
 362  *   On the first call, we just save the DN and entryID. On subsequent calls
 363  * we compare the DN and entryID with the saved values.
 364  */
 365 static int
 366 findbase_cb( Operation *op, SlapReply *rs )
 367 {
 368         slap_callback *sc = op->o_callback;
 369
 370         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 371                 fbase_cookie *fc = sc->sc_private;
 372
 373                 /* If no entryID, we're looking for the first time.
 374                  * Just store whatever we got.
 375                  */
 376                 if ( fc->fss->s_eid == NOID ) {
 377                         fc->fbase = 2;
 378                         fc->fss->s_eid = rs->sr_entry->e_id;
 379                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 380
 381                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 382                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 383
 384                 /* OK, the DN is the same and the entryID is the same. */
 385                         fc->fbase = 1;
 386                 }
 387         }
 388         if ( rs->sr_err != LDAP_SUCCESS ) {
 389                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 390         }
 391         return LDAP_SUCCESS;
 392 }
 393
 394 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 395 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 396
 397 static int
 398 syncprov_findbase( Operation *op, fbase_cookie *fc )
 399 {
 400         /* Use basic parameters from syncrepl search, but use
 401          * current op's threadctx / tmpmemctx
 402          */
 403         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 404         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 405                 slap_callback cb = {0};
 406                 Operation fop;
 407                 SlapReply frs = { REP_RESULT };
 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_bd = fop.o_bd->bd_self;
 416                 fop.o_hdr = op->o_hdr;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419
 420                 cb.sc_response = findbase_cb;
 421                 cb.sc_private = fc;
 422
 423                 fop.o_sync_mode = 0;    /* turn off sync mode */
 424                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 425                 fop.o_callback = &cb;
 426                 fop.o_tag = LDAP_REQ_SEARCH;
 427                 fop.ors_scope = LDAP_SCOPE_BASE;
 428                 fop.ors_limit = NULL;
 429                 fop.ors_slimit = 1;
 430                 fop.ors_tlimit = SLAP_NO_LIMIT;
 431                 fop.ors_attrs = slap_anlist_no_attrs;
 432                 fop.ors_attrsonly = 1;
 433                 fop.ors_filter = &generic_filter;
 434                 fop.ors_filterstr = generic_filterstr;
 435
 436                 rc = fop.o_bd->be_search( &fop, &frs );
 437         } else {
 438                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 439                 fc->fbase = 1;
 440         }
 441
 442         /* After the first call, see if the fdn resides in the scope */
 443         if ( fc->fbase == 1 ) {
 444                 switch ( fc->fss->s_op->ors_scope ) {
 445                 case LDAP_SCOPE_BASE:
 446                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 447                         break;
 448                 case LDAP_SCOPE_ONELEVEL: {
 449                         struct berval pdn;
 450                         dnParent( fc->fdn, &pdn );
 451                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 452                         break; }
 453                 case LDAP_SCOPE_SUBTREE:
 454                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 455                         break;
 456                 case LDAP_SCOPE_SUBORDINATE:
 457                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 458                                 !dn_match( fc->fdn, &fc->fss->s_base );
 459                         break;
 460                 }
 461         }
 462
 463         if ( fc->fbase )
 464                 return LDAP_SUCCESS;
 465
 466         /* If entryID has changed, then the base of this search has
 467          * changed. Invalidate the psearch.
 468          */
 469         return LDAP_NO_SUCH_OBJECT;
 470 }
 471
 472 /* syncprov_findcsn:
 473  *   This function has three different purposes, but they all use a search
 474  * that filters on entryCSN so they're combined here.
 475  * 1: at startup time, after a contextCSN has been read from the database,
 476  * we search for all entries with CSN >= contextCSN in case the contextCSN
 477  * was not checkpointed at the previous shutdown.
 478  *
 479  * 2: when the current contextCSN is known and we have a sync cookie, we search
 480  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 481  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 482  *
 483  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 484  * CSN, and generate Present records for them. We always collect this result
 485  * in SyncID sets, even if there's only one match.
 486  */
 487 typedef enum find_csn_t {
 488         FIND_MAXCSN     = 1,
 489         FIND_CSN        = 2,
 490         FIND_PRESENT    = 3
 491 } find_csn_t;
 492
 493 static int
 494 findmax_cb( Operation *op, SlapReply *rs )
 495 {
 496         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 497                 struct berval *maxcsn = op->o_callback->sc_private;
 498                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 499                         slap_schema.si_ad_entryCSN );
 500
 501                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 502                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 503                         maxcsn->bv_len = a->a_vals[0].bv_len;
 504                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 505                 }
 506         }
 507         return LDAP_SUCCESS;
 508 }
 509
 510 static int
 511 findcsn_cb( Operation *op, SlapReply *rs )
 512 {
 513         slap_callback *sc = op->o_callback;
 514
 515         /* We just want to know that at least one exists, so it's OK if
 516          * we exceed the unchecked limit.
 517          */
 518         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 519                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 520                 sc->sc_private = (void *)1;
 521         }
 522         return LDAP_SUCCESS;
 523 }
 524
 525 /* Build a list of entryUUIDs for sending in a SyncID set */
 526
 527 #define UUID_LEN        16
 528
 529 typedef struct fpres_cookie {
 530         int num;
 531         BerVarray uuids;
 532         char *last;
 533 } fpres_cookie;
 534
 535 static int
 536 findpres_cb( Operation *op, SlapReply *rs )
 537 {
 538         slap_callback *sc = op->o_callback;
 539         fpres_cookie *pc = sc->sc_private;
 540         Attribute *a;
 541         int ret = SLAP_CB_CONTINUE;
 542
 543         switch ( rs->sr_type ) {
 544         case REP_SEARCH:
 545                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 546                 if ( a ) {
 547                         pc->uuids[pc->num].bv_val = pc->last;
 548                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 549                                 pc->uuids[pc->num].bv_len );
 550                         pc->num++;
 551                         pc->last = pc->uuids[pc->num].bv_val;
 552                         pc->uuids[pc->num].bv_val = NULL;
 553                 }
 554                 ret = LDAP_SUCCESS;
 555                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 556                         break;
 557                 /* FALLTHRU */
 558         case REP_RESULT:
 559                 ret = rs->sr_err;
 560                 if ( pc->num ) {
 561                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 562                                 0, pc->uuids, 0 );
 563                         pc->uuids[pc->num].bv_val = pc->last;
 564                         pc->num = 0;
 565                         pc->last = pc->uuids[0].bv_val;
 566                 }
 567                 break;
 568         default:
 569                 break;
 570         }
 571         return ret;
 572 }
 573
 574 static int
 575 syncprov_findcsn( Operation *op, find_csn_t mode )
 576 {
 577         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 578         syncprov_info_t         *si = on->on_bi.bi_private;
 579
 580         slap_callback cb = {0};
 581         Operation fop;
 582         SlapReply frs = { REP_RESULT };
 583         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 584         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 585         struct berval maxcsn;
 586         Filter cf;
 587         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 588         fpres_cookie pcookie;
 589         sync_control *srs = NULL;
 590         struct slap_limits_set fc_limits;
 591         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 592         int maxid;
 593
 594         if ( mode != FIND_MAXCSN ) {
 595                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 596         }
 597
 598         fop = *op;
 599         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 600         /* We want pure entries, not referrals */
 601         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 602
 603         cf.f_ava = &eq;
 604         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 605         BER_BVZERO( &cf.f_av_value );
 606         cf.f_next = NULL;
 607
 608         fop.o_callback = &cb;
 609         fop.ors_limit = NULL;
 610         fop.ors_tlimit = SLAP_NO_LIMIT;
 611         fop.ors_filter = &cf;
 612         fop.ors_filterstr.bv_val = buf;
 613
 614 again:
 615         switch( mode ) {
 616         case FIND_MAXCSN:
 617                 cf.f_choice = LDAP_FILTER_GE;
 618                 /* If there are multiple CSNs, use the one with our serverID */
 619                 for ( i=0; i<si->si_numcsns; i++) {
 620                         if ( slap_serverID == si->si_sids[i] ) {
 621                                 maxid = i;
 622                                 break;
 623                         }
 624                 }
 625                 if ( i == si->si_numcsns ) {
 626                         /* No match: this is multimaster, and none of the content in the DB
 627                          * originated locally. Treat like no CSN.
 628                          */
 629                         return LDAP_NO_SUCH_OBJECT;
 630                 }
 631                 cf.f_av_value = si->si_ctxcsn[maxid];
 632                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 633                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 634                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 635                         return LDAP_OTHER;
 636                 }
 637                 fop.ors_attrsonly = 0;
 638                 fop.ors_attrs = csn_anlist;
 639                 fop.ors_slimit = SLAP_NO_LIMIT;
 640                 cb.sc_private = &maxcsn;
 641                 cb.sc_response = findmax_cb;
 642                 strcpy( cbuf, cf.f_av_value.bv_val );
 643                 maxcsn.bv_val = cbuf;
 644                 maxcsn.bv_len = cf.f_av_value.bv_len;
 645                 break;
 646         case FIND_CSN:
 647                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 648                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 649                         /* If there are multiple CSNs, use the smallest */
 650                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 651                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 652                                         > 0 ) {
 653                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 654                                 }
 655                         }
 656                 }
 657                 /* Look for exact match the first time */
 658                 if ( findcsn_retry ) {
 659                         cf.f_choice = LDAP_FILTER_EQUALITY;
 660                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 661                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 662                 /* On retry, look for <= */
 663                 } else {
 664                         cf.f_choice = LDAP_FILTER_LE;
 665                         fop.ors_limit = &fc_limits;
 666                         memset( &fc_limits, 0, sizeof( fc_limits ));
 667                         fc_limits.lms_s_unchecked = 1;
 668                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 669                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 670                 }
 671                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 672                         return LDAP_OTHER;
 673                 }
 674                 fop.ors_attrsonly = 1;
 675                 fop.ors_attrs = slap_anlist_no_attrs;
 676                 fop.ors_slimit = 1;
 677                 cb.sc_private = NULL;
 678                 cb.sc_response = findcsn_cb;
 679                 break;
 680         case FIND_PRESENT:
 681                 fop.ors_filter = op->ors_filter;
 682                 fop.ors_filterstr = op->ors_filterstr;
 683                 fop.ors_attrsonly = 0;
 684                 fop.ors_attrs = uuid_anlist;
 685                 fop.ors_slimit = SLAP_NO_LIMIT;
 686                 cb.sc_private = &pcookie;
 687                 cb.sc_response = findpres_cb;
 688                 pcookie.num = 0;
 689
 690                 /* preallocate storage for a full set */
 691                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 692                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 693                         op->o_tmpmemctx );
 694                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 695                 pcookie.uuids[0].bv_val = pcookie.last;
 696                 pcookie.uuids[0].bv_len = UUID_LEN;
 697                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 698                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 699                         pcookie.uuids[i].bv_len = UUID_LEN;
 700                 }
 701                 break;
 702         }
 703
 704         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 705         fop.o_bd->be_search( &fop, &frs );
 706         fop.o_bd->bd_info = (BackendInfo *)on;
 707
 708         switch( mode ) {
 709         case FIND_MAXCSN:
 710                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 711 #ifdef CHECK_CSN
 712                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 713                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 714 #endif
 715                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 716                         si->si_numops++;        /* ensure a checkpoint */
 717                 }
 718                 break;
 719         case FIND_CSN:
 720                 /* If matching CSN was not found, invalidate the context. */
 721                 if ( !cb.sc_private ) {
 722                         /* If we didn't find an exact match, then try for <= */
 723                         if ( findcsn_retry ) {
 724                                 findcsn_retry = 0;
 725                                 goto again;
 726                         }
 727                         rc = LDAP_NO_SUCH_OBJECT;
 728                 }
 729                 break;
 730         case FIND_PRESENT:
 731                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 732                 break;
 733         }
 734
 735         return rc;
 736 }
 737
 738 static void
 739 syncprov_free_syncop( syncops *so )
 740 {
 741         syncres *sr, *srnext;
 742         GroupAssertion *ga, *gnext;
 743
 744         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 745         if ( --so->s_inuse > 0 ) {
 746                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 747                 return;
 748         }
 749         if ( so->s_qtask ) {
 750                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 751                 if ( ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) )
 752                         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 753                 ldap_pvt_runqueue_remove( &slapd_rq, so->s_qtask );
 754                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 755         }
 756         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 757         if ( so->s_flags & PS_IS_DETACHED ) {
 758                 filter_free( so->s_op->ors_filter );
 759                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 760                         gnext = ga->ga_next;
 761                         ch_free( ga );
 762                 }
 763                 ch_free( so->s_op );
 764         }
 765         ch_free( so->s_base.bv_val );
 766         for ( sr=so->s_res; sr; sr=srnext ) {
 767                 srnext = sr->s_next;
 768                 ch_free( sr );
 769         }
 770         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 771         ch_free( so );
 772 }
 773
 774 /* Send a persistent search response */
 775 static int
 776 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 777         Entry **e, int mode )
 778 {
 779         slap_overinst *on = opc->son;
 780
 781         SlapReply rs = { REP_SEARCH };
 782         LDAPControl *ctrls[2];
 783         struct berval cookie, csns[2];
 784         Entry e_uuid = {0};
 785         Attribute a_uuid = {0};
 786
 787         if ( so->s_op->o_abandon )
 788                 return SLAPD_ABANDON;
 789
 790         ctrls[1] = NULL;
 791         csns[0] = opc->sctxcsn;
 792         BER_BVZERO( &csns[1] );
 793         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 794
 795         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 796
 797         e_uuid.e_attrs = &a_uuid;
 798         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 799         a_uuid.a_nvals = &opc->suuid;
 800         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 801                 mode, ctrls, 0, 1, &cookie );
 802         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 803
 804         rs.sr_ctrls = ctrls;
 805         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 806         switch( mode ) {
 807         case LDAP_SYNC_ADD:
 808                 rs.sr_entry = *e;
 809                 if ( rs.sr_entry->e_private )
 810                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 811                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 812                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 813                         rs.sr_err = send_search_reference( op, &rs );
 814                         ber_bvarray_free( rs.sr_ref );
 815                         if ( !rs.sr_entry )
 816                                 *e = NULL;
 817                         break;
 818                 }
 819                 /* fallthru */
 820         case LDAP_SYNC_MODIFY:
 821                 rs.sr_entry = *e;
 822                 if ( rs.sr_entry->e_private )
 823                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 824                 rs.sr_attrs = op->ors_attrs;
 825                 rs.sr_err = send_search_entry( op, &rs );
 826                 if ( !rs.sr_entry )
 827                         *e = NULL;
 828                 break;
 829         case LDAP_SYNC_DELETE:
 830                 e_uuid.e_attrs = NULL;
 831                 e_uuid.e_name = opc->sdn;
 832                 e_uuid.e_nname = opc->sndn;
 833                 rs.sr_entry = &e_uuid;
 834                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 835                         struct berval bv = BER_BVNULL;
 836                         rs.sr_ref = &bv;
 837                         rs.sr_err = send_search_reference( op, &rs );
 838                 } else {
 839                         rs.sr_err = send_search_entry( op, &rs );
 840                 }
 841                 break;
 842         default:
 843                 assert(0);
 844         }
 845         /* In case someone else freed it already? */
 846         if ( rs.sr_ctrls ) {
 847                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 848                 rs.sr_ctrls = NULL;
 849         }
 850
 851         return rs.sr_err;
 852 }
 853
 854 /* Play back queued responses */
 855 static int
 856 syncprov_qplay( Operation *op, struct re_s *rtask )
 857 {
 858         syncops *so = rtask->arg;
 859         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 860         syncres *sr;
 861         Entry *e;
 862         opcookie opc;
 863         int rc = 0;
 864
 865         opc.son = on;
 866
 867         for (;;) {
 868                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 869                 sr = so->s_res;
 870                 if ( sr )
 871                         so->s_res = sr->s_next;
 872                 if ( !so->s_res )
 873                         so->s_restail = NULL;
 874                 /* Exit loop with mutex held */
 875                 if ( !sr || so->s_op->o_abandon )
 876                         break;
 877                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 878
 879                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 880                     SlapReply rs = { REP_INTERMEDIATE };
 881
 882                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 883                                 &sr->s_csn, 0, NULL, 0 );
 884                 } else {
 885                         opc.sdn = sr->s_dn;
 886                         opc.sndn = sr->s_ndn;
 887                         opc.suuid = sr->s_uuid;
 888                         opc.sctxcsn = sr->s_csn;
 889                         opc.sreference = sr->s_isreference;
 890                         e = NULL;
 891
 892                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 893                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 894                                 if ( rc ) {
 895                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 896                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 897                                         ch_free( sr );
 898                                         rc = 0;
 899                                         continue;
 900                                 }
 901                         }
 902                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 903
 904                         if ( e ) {
 905                                 overlay_entry_release_ov( op, e, 0, on );
 906                         }
 907                 }
 908
 909                 ch_free( sr );
 910
 911                 if ( rc ) {
 912                         /* Exit loop with mutex held */
 913                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 914                         break;
 915                 }
 916         }
 917
 918         /* wait until we get explicitly scheduled again */
 919         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 920         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 921         if ( rc == 0 ) {
 922                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 923         } else {
 924                 /* bail out on any error */
 925                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 926
 927                 /* Prevent duplicate remove */
 928                 if ( so->s_qtask == rtask )
 929                         so->s_qtask = NULL;
 930         }
 931         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 932         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 933         return rc;
 934 }
 935
 936 /* runqueue task for playing back queued responses */
 937 static void *
 938 syncprov_qtask( void *ctx, void *arg )
 939 {
 940         struct re_s *rtask = arg;
 941         syncops *so = rtask->arg;
 942         OperationBuffer opbuf;
 943         Operation *op;
 944         BackendDB be;
 945         int rc;
 946
 947         op = &opbuf.ob_op;
 948         *op = *so->s_op;
 949         op->o_hdr = &opbuf.ob_hdr;
 950         op->o_controls = opbuf.ob_controls;
 951         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 952
 953         *op->o_hdr = *so->s_op->o_hdr;
 954
 955         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 956         op->o_tmpmfuncs = &slap_sl_mfuncs;
 957         op->o_threadctx = ctx;
 958
 959         /* syncprov_qplay expects a fake db */
 960         be = *so->s_op->o_bd;
 961         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 962         op->o_bd = &be;
 963         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 964         op->o_callback = NULL;
 965
 966         rc = syncprov_qplay( op, rtask );
 967
 968         /* decrement use count... */
 969         syncprov_free_syncop( so );
 970
 971 #if 0   /* FIXME: connection_close isn't exported from slapd.
 972                  * should it be?
 973                  */
 974         if ( rc ) {
 975                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 976                 if ( connection_state_closing( op->o_conn )) {
 977                         connection_close( op->o_conn );
 978                 }
 979                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 980         }
 981 #endif
 982         return NULL;
 983 }
 984
 985 /* Start the task to play back queued psearch responses */
 986 static void
 987 syncprov_qstart( syncops *so )
 988 {
 989         int wake=0;
 990         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 991         if ( !so->s_qtask ) {
 992                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 993                         syncprov_qtask, so, "syncprov_qtask",
 994                         so->s_op->o_conn->c_peer_name.bv_val );
 995                 ++so->s_inuse;
 996                 wake = 1;
 997         } else {
 998                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 999                         !so->s_qtask->next_sched.tv_sec ) {
1000                         so->s_qtask->interval.tv_sec = 0;
1001                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
1002                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
1003                         ++so->s_inuse;
1004                         wake = 1;
1005                 }
1006         }
1007         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
1008         if ( wake )
1009                 slap_wake_listener();
1010 }
1011
1012 /* Queue a persistent search response */
1013 static int
1014 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1015 {
1016         syncres *sr;
1017         int srsize;
1018         struct berval cookie = opc->sctxcsn;
1019
1020         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1021                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1022
1023                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1024                         so->s_rid, so->s_sid);
1025         } else if ( opc->sctxcsn.bv_len ) {
1026                 /* Don't send changes back to their originator */
1027                 int sid = slap_parse_csn_sid( &opc->sctxcsn );
1028                 if ( sid >= 0 && sid == so->s_sid )
1029                         return LDAP_SUCCESS;
1030         }
1031
1032         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1033                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1034         if ( cookie.bv_len )
1035                 srsize += cookie.bv_len + 1;
1036         sr = ch_malloc( srsize );
1037         sr->s_next = NULL;
1038         sr->s_dn.bv_val = (char *)(sr + 1);
1039         sr->s_dn.bv_len = opc->sdn.bv_len;
1040         sr->s_mode = mode;
1041         sr->s_isreference = opc->sreference;
1042         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1043                  opc->sdn.bv_val ) + 1;
1044         sr->s_ndn.bv_len = opc->sndn.bv_len;
1045         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1046                  opc->sndn.bv_val ) + 1;
1047         sr->s_uuid.bv_len = opc->suuid.bv_len;
1048         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1049         if ( cookie.bv_len ) {
1050                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1051                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1052         } else {
1053                 sr->s_csn.bv_val = NULL;
1054         }
1055         sr->s_csn.bv_len = cookie.bv_len;
1056
1057         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1058                 ch_free( cookie.bv_val );
1059         }
1060
1061         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1062         if ( !so->s_res ) {
1063                 so->s_res = sr;
1064         } else {
1065                 so->s_restail->s_next = sr;
1066         }
1067         so->s_restail = sr;
1068
1069         /* If the base of the psearch was modified, check it next time round */
1070         if ( so->s_flags & PS_WROTE_BASE ) {
1071                 so->s_flags ^= PS_WROTE_BASE;
1072                 so->s_flags |= PS_FIND_BASE;
1073         }
1074         if ( so->s_flags & PS_IS_DETACHED ) {
1075                 syncprov_qstart( so );
1076         }
1077         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1078         return LDAP_SUCCESS;
1079 }
1080
1081 static int
1082 syncprov_drop_psearch( syncops *so, int lock )
1083 {
1084         if ( so->s_flags & PS_IS_DETACHED ) {
1085                 if ( lock )
1086                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1087                 so->s_op->o_conn->c_n_ops_executing--;
1088                 so->s_op->o_conn->c_n_ops_completed++;
1089                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1090                         o_next );
1091                 if ( lock )
1092                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1093         }
1094         syncprov_free_syncop( so );
1095
1096         return 0;
1097 }
1098
1099 static int
1100 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1101 {
1102         slap_callback *sc = op->o_callback;
1103         op->o_callback = sc->sc_next;
1104         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1105         op->o_tmpfree( sc, op->o_tmpmemctx );
1106         return 0;
1107 }
1108
1109 static int
1110 syncprov_op_abandon( Operation *op, SlapReply *rs )
1111 {
1112         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1113         syncprov_info_t         *si = on->on_bi.bi_private;
1114         syncops *so, *soprev;
1115
1116         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1117         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1118                 soprev=so, so=so->s_next ) {
1119                 if ( so->s_op->o_connid == op->o_connid &&
1120                         so->s_op->o_msgid == op->orn_msgid ) {
1121                                 so->s_op->o_abandon = 1;
1122                                 soprev->s_next = so->s_next;
1123                                 break;
1124                 }
1125         }
1126         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1127         if ( so ) {
1128                 /* Is this really a Cancel exop? */
1129                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1130                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1131                         rs->sr_err = LDAP_CANCELLED;
1132                         send_ldap_result( so->s_op, rs );
1133                         if ( so->s_flags & PS_IS_DETACHED ) {
1134                                 slap_callback *cb;
1135                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1136                                 cb->sc_cleanup = syncprov_ab_cleanup;
1137                                 cb->sc_next = op->o_callback;
1138                                 cb->sc_private = so;
1139                                 return SLAP_CB_CONTINUE;
1140                         }
1141                 }
1142                 syncprov_drop_psearch( so, 0 );
1143         }
1144         return SLAP_CB_CONTINUE;
1145 }
1146
1147 /* Find which persistent searches are affected by this operation */
1148 static void
1149 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1150 {
1151         slap_overinst *on = opc->son;
1152         syncprov_info_t         *si = on->on_bi.bi_private;
1153
1154         fbase_cookie fc;
1155         syncops *ss, *sprev, *snext;
1156         Entry *e = NULL;
1157         Attribute *a;
1158         int rc;
1159         struct berval newdn;
1160         int freefdn = 0;
1161         BackendDB *b0 = op->o_bd, db;
1162
1163         fc.fdn = &op->o_req_ndn;
1164         /* compute new DN */
1165         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1166                 struct berval pdn;
1167                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1168                 else dnParent( fc.fdn, &pdn );
1169                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1170                 fc.fdn = &newdn;
1171                 freefdn = 1;
1172         }
1173         if ( op->o_tag != LDAP_REQ_ADD ) {
1174                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1175                         db = *op->o_bd;
1176                         op->o_bd = &db;
1177                 }
1178                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1179                 /* If we're sending responses now, make a copy and unlock the DB */
1180                 if ( e && !saveit ) {
1181                         Entry *e2 = entry_dup( e );
1182                         overlay_entry_release_ov( op, e, 0, on );
1183                         e = e2;
1184                 }
1185                 if ( rc ) {
1186                         op->o_bd = b0;
1187                         return;
1188                 }
1189         } else {
1190                 e = op->ora_e;
1191         }
1192
1193         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1194                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1195                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1196                 opc->sreference = is_entry_referral( e );
1197                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1198                 if ( a )
1199                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1200         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1201                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1202                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1203                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1204                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1205         }
1206
1207         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1208         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1209                 sprev = ss, ss=snext)
1210         {
1211                 Operation op2;
1212                 Opheader oh;
1213                 syncmatches *sm;
1214                 int found = 0;
1215
1216                 snext = ss->s_next;
1217                 if ( ss->s_op->o_abandon )
1218                         continue;
1219
1220                 /* validate base */
1221                 fc.fss = ss;
1222                 fc.fbase = 0;
1223                 fc.fscope = 0;
1224
1225                 /* If the base of the search is missing, signal a refresh */
1226                 rc = syncprov_findbase( op, &fc );
1227                 if ( rc != LDAP_SUCCESS ) {
1228                         SlapReply rs = {REP_RESULT};
1229                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1230                                 "search base has changed" );
1231                         sprev->s_next = snext;
1232                         syncprov_drop_psearch( ss, 1 );
1233                         ss = sprev;
1234                         continue;
1235                 }
1236
1237
1238                 /* If we're sending results now, look for this op in old matches */
1239                 if ( !saveit ) {
1240                         syncmatches *old;
1241
1242                         /* Did we modify the search base? */
1243                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1244                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1245                                 ss->s_flags |= PS_WROTE_BASE;
1246                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1247                         }
1248
1249                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1250                                 old=sm, sm=sm->sm_next ) {
1251                                 if ( sm->sm_op == ss ) {
1252                                         found = 1;
1253                                         old->sm_next = sm->sm_next;
1254                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1255                                         break;
1256                                 }
1257                         }
1258                 }
1259
1260                 if ( fc.fscope ) {
1261                         op2 = *ss->s_op;
1262                         oh = *op->o_hdr;
1263                         oh.oh_conn = ss->s_op->o_conn;
1264                         oh.oh_connid = ss->s_op->o_connid;
1265                         op2.o_hdr = &oh;
1266                         op2.o_extra = op->o_extra;
1267                 }
1268
1269                 /* check if current o_req_dn is in scope and matches filter */
1270                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1271                         LDAP_COMPARE_TRUE ) {
1272                         if ( saveit ) {
1273                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1274                                 sm->sm_next = opc->smatches;
1275                                 sm->sm_op = ss;
1276                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1277                                 ++ss->s_inuse;
1278                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1279                                 opc->smatches = sm;
1280                         } else {
1281                                 /* if found send UPDATE else send ADD */
1282                                 syncprov_qresp( opc, ss,
1283                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1284                         }
1285                 } else if ( !saveit && found ) {
1286                         /* send DELETE */
1287                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1288                 } else if ( !saveit ) {
1289                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1290                 }
1291                 if ( !saveit && found ) {
1292                         /* Decrement s_inuse, was incremented when called
1293                          * with saveit == TRUE
1294                          */
1295                         syncprov_free_syncop( ss );
1296                 }
1297         }
1298         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1299
1300         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1301                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1302                         op->o_bd = &db;
1303                 }
1304                 overlay_entry_release_ov( op, e, 0, on );
1305                 op->o_bd = b0;
1306         }
1307         if ( freefdn ) {
1308                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1309         }
1310         op->o_bd = b0;
1311 }
1312
1313 static int
1314 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1315 {
1316         slap_callback *cb = op->o_callback;
1317         opcookie *opc = cb->sc_private;
1318         slap_overinst *on = opc->son;
1319         syncprov_info_t         *si = on->on_bi.bi_private;
1320         syncmatches *sm, *snext;
1321         modtarget *mt, mtdummy;
1322
1323         for (sm = opc->smatches; sm; sm=snext) {
1324                 snext = sm->sm_next;
1325                 syncprov_free_syncop( sm->sm_op );
1326                 op->o_tmpfree( sm, op->o_tmpmemctx );
1327         }
1328
1329         /* Remove op from lock table */
1330         mtdummy.mt_op = op;
1331         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1332         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1333         if ( mt ) {
1334                 modinst *mi = mt->mt_mods;
1335
1336                 /* If there are more, promote the next one */
1337                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1338                 if ( mi->mi_next ) {
1339                         mt->mt_mods = mi->mi_next;
1340                         mt->mt_op = mt->mt_mods->mi_op;
1341                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1342                 } else {
1343                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1344                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1345                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1346                         ch_free( mt );
1347                 }
1348         }
1349         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1350         if ( !BER_BVISNULL( &opc->suuid ))
1351                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1352         if ( !BER_BVISNULL( &opc->sndn ))
1353                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1354         if ( !BER_BVISNULL( &opc->sdn ))
1355                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1356         op->o_callback = cb->sc_next;
1357         op->o_tmpfree(cb, op->o_tmpmemctx);
1358
1359         return 0;
1360 }
1361
1362 static void
1363 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1364 {
1365         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1366         Modifications mod;
1367         Operation opm;
1368         SlapReply rsm = { 0 };
1369         slap_callback cb = {0};
1370         BackendDB be;
1371 #ifdef CHECK_CSN
1372         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1373
1374         int i;
1375         for ( i=0; i<si->si_numcsns; i++ ) {
1376                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1377         }
1378 #endif
1379         mod.sml_numvals = si->si_numcsns;
1380         mod.sml_values = si->si_ctxcsn;
1381         mod.sml_nvalues = NULL;
1382         mod.sml_desc = slap_schema.si_ad_contextCSN;
1383         mod.sml_op = LDAP_MOD_REPLACE;
1384         mod.sml_flags = SLAP_MOD_INTERNAL;
1385         mod.sml_next = NULL;
1386
1387         cb.sc_response = slap_null_cb;
1388         opm = *op;
1389         opm.o_tag = LDAP_REQ_MODIFY;
1390         opm.o_callback = &cb;
1391         opm.orm_modlist = &mod;
1392         opm.orm_no_opattrs = 1;
1393         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1394                 be = *on->on_info->oi_origdb;
1395                 opm.o_bd = &be;
1396         }
1397         opm.o_req_dn = opm.o_bd->be_suffix[0];
1398         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1399         opm.o_bd->bd_info = on->on_info->oi_orig;
1400         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1401         opm.o_no_schema_check = 1;
1402         opm.o_bd->be_modify( &opm, &rsm );
1403         if ( mod.sml_next != NULL ) {
1404                 slap_mods_free( mod.sml_next, 1 );
1405         }
1406 #ifdef CHECK_CSN
1407         for ( i=0; i<si->si_numcsns; i++ ) {
1408                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1409         }
1410 #endif
1411 }
1412
1413 static void
1414 syncprov_add_slog( Operation *op )
1415 {
1416         opcookie *opc = op->o_callback->sc_private;
1417         slap_overinst *on = opc->son;
1418         syncprov_info_t         *si = on->on_bi.bi_private;
1419         sessionlog *sl;
1420         slog_entry *se;
1421
1422         sl = si->si_logs;
1423         {
1424                 /* Allocate a record. UUIDs are not NUL-terminated. */
1425                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1426                         op->o_csn.bv_len + 1 );
1427                 se->se_next = NULL;
1428                 se->se_tag = op->o_tag;
1429
1430                 se->se_uuid.bv_val = (char *)(&se[1]);
1431                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1432                 se->se_uuid.bv_len = opc->suuid.bv_len;
1433
1434                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1435                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1436                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1437                 se->se_csn.bv_len = op->o_csn.bv_len;
1438                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1439
1440                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1441                 if ( sl->sl_head ) {
1442                         sl->sl_tail->se_next = se;
1443                 } else {
1444                         sl->sl_head = se;
1445                 }
1446                 sl->sl_tail = se;
1447                 sl->sl_num++;
1448                 while ( sl->sl_num > sl->sl_size ) {
1449                         se = sl->sl_head;
1450                         sl->sl_head = se->se_next;
1451                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1452                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1453                         ch_free( se );
1454                         sl->sl_num--;
1455                 }
1456                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1457         }
1458 }
1459
1460 /* Just set a flag if we found the matching entry */
1461 static int
1462 playlog_cb( Operation *op, SlapReply *rs )
1463 {
1464         if ( rs->sr_type == REP_SEARCH ) {
1465                 op->o_callback->sc_private = (void *)1;
1466         }
1467         return rs->sr_err;
1468 }
1469
1470 /* enter with sl->sl_mutex locked, release before returning */
1471 static void
1472 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1473         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1474 {
1475         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1476         slog_entry *se;
1477         int i, j, ndel, num, nmods, mmods;
1478         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1479         BerVarray uuids;
1480         struct berval delcsn[2];
1481
1482         if ( !sl->sl_num ) {
1483                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1484                 return;
1485         }
1486
1487         num = sl->sl_num;
1488         i = 0;
1489         nmods = 0;
1490
1491         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1492                 num * UUID_LEN, op->o_tmpmemctx );
1493         uuids[0].bv_val = (char *)(uuids + num + 1);
1494
1495         delcsn[0].bv_len = 0;
1496         delcsn[0].bv_val = cbuf;
1497         BER_BVZERO(&delcsn[1]);
1498
1499         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1500          * and everything else at the end. Do this first so we can
1501          * unlock the list mutex.
1502          */
1503         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1504                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1505         for ( se=sl->sl_head; se; se=se->se_next ) {
1506                 int k;
1507                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1508                 ndel = 1;
1509                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1510                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1511                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1512                                 break;
1513                         }
1514                 }
1515                 if ( ndel <= 0 ) {
1516                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1517                         continue;
1518                 }
1519                 ndel = 0;
1520                 for ( k=0; k<numcsns; k++ ) {
1521                         if ( se->se_sid == sids[k] ) {
1522                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1523                                 break;
1524                         }
1525                 }
1526                 if ( ndel > 0 ) {
1527                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1528                         break;
1529                 }
1530                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1531                         j = i;
1532                         i++;
1533                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1534                         delcsn[0].bv_len = se->se_csn.bv_len;
1535                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1536                 } else {
1537                         nmods++;
1538                         j = num - nmods;
1539                 }
1540                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1541                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1542                 uuids[j].bv_len = UUID_LEN;
1543         }
1544         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1545
1546         ndel = i;
1547
1548         /* Zero out unused slots */
1549         for ( i=ndel; i < num - nmods; i++ )
1550                 uuids[i].bv_len = 0;
1551
1552         /* Mods must be validated to see if they belong in this delete set.
1553          */
1554
1555         mmods = nmods;
1556         /* Strip any duplicates */
1557         for ( i=0; i<nmods; i++ ) {
1558                 for ( j=0; j<ndel; j++ ) {
1559                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1560                                 uuids[num - 1 - i].bv_len = 0;
1561                                 mmods --;
1562                                 break;
1563                         }
1564                 }
1565                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1566                 for ( j=0; j<i; j++ ) {
1567                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1568                                 uuids[num - 1 - i].bv_len = 0;
1569                                 mmods --;
1570                                 break;
1571                         }
1572                 }
1573         }
1574
1575         if ( mmods ) {
1576                 Operation fop;
1577                 SlapReply frs = { REP_RESULT };
1578                 int rc;
1579                 Filter mf, af;
1580                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1581                 slap_callback cb = {0};
1582
1583                 fop = *op;
1584
1585                 fop.o_sync_mode = 0;
1586                 fop.o_callback = &cb;
1587                 fop.ors_limit = NULL;
1588                 fop.ors_tlimit = SLAP_NO_LIMIT;
1589                 fop.ors_attrs = slap_anlist_all_attributes;
1590                 fop.ors_attrsonly = 0;
1591                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1592
1593                 af.f_choice = LDAP_FILTER_AND;
1594                 af.f_next = NULL;
1595                 af.f_and = &mf;
1596                 mf.f_choice = LDAP_FILTER_EQUALITY;
1597                 mf.f_ava = &eq;
1598                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1599                 mf.f_next = fop.ors_filter;
1600
1601                 fop.ors_filter = &af;
1602
1603                 cb.sc_response = playlog_cb;
1604                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1605
1606                 for ( i=ndel; i<num; i++ ) {
1607                         if ( uuids[i].bv_len == 0 ) continue;
1608
1609                         mf.f_av_value = uuids[i];
1610                         cb.sc_private = NULL;
1611                         fop.ors_slimit = 1;
1612                         frs.sr_nentries = 0;
1613                         rc = fop.o_bd->be_search( &fop, &frs );
1614
1615                         /* If entry was not found, add to delete list */
1616                         if ( !cb.sc_private ) {
1617                                 uuids[ndel++] = uuids[i];
1618                         }
1619                 }
1620                 fop.o_bd->bd_info = (BackendInfo *)on;
1621         }
1622         if ( ndel ) {
1623                 struct berval cookie;
1624
1625                 if ( delcsn[0].bv_len ) {
1626                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1627                                 srs->sr_state.sid );
1628
1629                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1630                 }
1631
1632                 uuids[ndel].bv_val = NULL;
1633                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1634                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1635                 if ( delcsn[0].bv_len ) {
1636                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1637                 }
1638         }
1639         op->o_tmpfree( uuids, op->o_tmpmemctx );
1640 }
1641
1642 static int
1643 syncprov_op_response( Operation *op, SlapReply *rs )
1644 {
1645         opcookie *opc = op->o_callback->sc_private;
1646         slap_overinst *on = opc->son;
1647         syncprov_info_t         *si = on->on_bi.bi_private;
1648         syncmatches *sm;
1649
1650         if ( rs->sr_err == LDAP_SUCCESS )
1651         {
1652                 struct berval maxcsn;
1653                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1654                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1655
1656                 /* Update our context CSN */
1657                 cbuf[0] = '\0';
1658                 maxcsn.bv_val = cbuf;
1659                 maxcsn.bv_len = sizeof(cbuf);
1660                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1661                 slap_get_commit_csn( op, &maxcsn, &foundit );
1662                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1663                         /* syncrepl queues the CSN values in the db where
1664                          * it is configured , not where the changes are made.
1665                          * So look for a value in the glue db if we didn't
1666                          * find any in this db.
1667                          */
1668                         BackendDB *be = op->o_bd;
1669                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1670                         maxcsn.bv_val = cbuf;
1671                         maxcsn.bv_len = sizeof(cbuf);
1672                         slap_get_commit_csn( op, &maxcsn, &foundit );
1673                         op->o_bd = be;
1674                 }
1675                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1676                         int i, sid;
1677 #ifdef CHECK_CSN
1678                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1679                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1680 #endif
1681                         sid = slap_parse_csn_sid( &maxcsn );
1682                         for ( i=0; i<si->si_numcsns; i++ ) {
1683                                 if ( sid == si->si_sids[i] ) {
1684                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1685                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1686                                                 csn_changed = 1;
1687                                         }
1688                                         break;
1689                                 }
1690                         }
1691                         /* It's a new SID for us */
1692                         if ( i == si->si_numcsns ) {
1693                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1694                                 csn_changed = 1;
1695                                 si->si_numcsns++;
1696                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1697                                         sizeof(int));
1698                                 si->si_sids[i] = sid;
1699                         }
1700                 } else if ( !foundit ) {
1701                         /* internal ops that aren't meant to be replicated */
1702                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1703                         return SLAP_CB_CONTINUE;
1704                 }
1705
1706                 /* Don't do any processing for consumer contextCSN updates */
1707                 if ( op->o_dont_replicate ) {
1708                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1709                         return SLAP_CB_CONTINUE;
1710                 }
1711
1712                 si->si_numops++;
1713                 if ( si->si_chkops || si->si_chktime ) {
1714                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1715                                 do_check = 1;
1716                                 si->si_numops = 0;
1717                         }
1718                         if ( si->si_chktime &&
1719                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1720                                 if ( si->si_chklast ) {
1721                                         do_check = 1;
1722                                         si->si_chklast = op->o_time;
1723                                 } else {
1724                                         si->si_chklast = 1;
1725                                 }
1726                         }
1727                 }
1728                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1729
1730                 if ( do_check ) {
1731                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1732                         syncprov_checkpoint( op, rs, on );
1733                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1734                 }
1735
1736                 /* only update consumer ctx if this is a newer csn */
1737                 if ( csn_changed ) {
1738                         opc->sctxcsn = maxcsn;
1739                 }
1740
1741                 /* Handle any persistent searches */
1742                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1743                 have_psearches = ( si->si_ops != NULL );
1744                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1745                 if ( have_psearches ) {
1746                         switch(op->o_tag) {
1747                         case LDAP_REQ_ADD:
1748                         case LDAP_REQ_MODIFY:
1749                         case LDAP_REQ_MODRDN:
1750                         case LDAP_REQ_EXTENDED:
1751                                 syncprov_matchops( op, opc, 0 );
1752                                 break;
1753                         case LDAP_REQ_DELETE:
1754                                 /* for each match in opc->smatches:
1755                                  *   send DELETE msg
1756                                  */
1757                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1758                                         if ( sm->sm_op->s_op->o_abandon )
1759                                                 continue;
1760                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1761                                 }
1762                                 break;
1763                         }
1764                 }
1765
1766                 /* Add any log records */
1767                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1768                         syncprov_add_slog( op );
1769                 }
1770
1771         }
1772         return SLAP_CB_CONTINUE;
1773 }
1774
1775 /* We don't use a subentry to store the context CSN any more.
1776  * We expose the current context CSN as an operational attribute
1777  * of the suffix entry.
1778  */
1779 static int
1780 syncprov_op_compare( Operation *op, SlapReply *rs )
1781 {
1782         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1783         syncprov_info_t         *si = on->on_bi.bi_private;
1784         int rc = SLAP_CB_CONTINUE;
1785
1786         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1787                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1788         {
1789                 Entry e = {0};
1790                 Attribute a = {0};
1791
1792                 e.e_name = op->o_bd->be_suffix[0];
1793                 e.e_nname = op->o_bd->be_nsuffix[0];
1794                 e.e_attrs = &a;
1795
1796                 a.a_desc = slap_schema.si_ad_contextCSN;
1797
1798                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1799
1800                 a.a_vals = si->si_ctxcsn;
1801                 a.a_nvals = a.a_vals;
1802                 a.a_numvals = si->si_numcsns;
1803
1804                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1805                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1806                 if ( ! rs->sr_err ) {
1807                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1808                         goto return_results;
1809                 }
1810
1811                 if ( get_assert( op ) &&
1812                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1813                 {
1814                         rs->sr_err = LDAP_ASSERTION_FAILED;
1815                         goto return_results;
1816                 }
1817
1818
1819                 rs->sr_err = LDAP_COMPARE_FALSE;
1820
1821                 if ( attr_valfind( &a,
1822                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1823                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1824                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1825                 {
1826                         rs->sr_err = LDAP_COMPARE_TRUE;
1827                 }
1828
1829 return_results:;
1830
1831                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1832
1833                 send_ldap_result( op, rs );
1834
1835                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1836                         rs->sr_err = LDAP_SUCCESS;
1837                 }
1838                 rc = rs->sr_err;
1839         }
1840
1841         return rc;
1842 }
1843
1844 static int
1845 syncprov_op_mod( Operation *op, SlapReply *rs )
1846 {
1847         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1848         syncprov_info_t         *si = on->on_bi.bi_private;
1849         slap_callback *cb;
1850         opcookie *opc;
1851         int have_psearches, cbsize;
1852
1853         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1854         have_psearches = ( si->si_ops != NULL );
1855         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1856
1857         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1858                 (have_psearches ? sizeof(modinst) : 0 );
1859
1860         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1861         opc = (opcookie *)(cb+1);
1862         opc->son = on;
1863         cb->sc_response = syncprov_op_response;
1864         cb->sc_cleanup = syncprov_op_cleanup;
1865         cb->sc_private = opc;
1866         cb->sc_next = op->o_callback;
1867         op->o_callback = cb;
1868
1869         /* If there are active persistent searches, lock this operation.
1870          * See seqmod.c for the locking logic on its own.
1871          */
1872         if ( have_psearches ) {
1873                 modtarget *mt, mtdummy;
1874                 modinst *mi;
1875
1876                 mi = (modinst *)(opc+1);
1877                 mi->mi_op = op;
1878
1879                 /* See if we're already modifying this entry... */
1880                 mtdummy.mt_op = op;
1881                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1882                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1883                 if ( mt ) {
1884                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1885                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1886                         mt->mt_tail->mi_next = mi;
1887                         mt->mt_tail = mi;
1888                         /* wait for this op to get to head of list */
1889                         while ( mt->mt_mods != mi ) {
1890                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1891                                 /* FIXME: if dynamic config can delete overlays or
1892                                  * databases we'll have to check for cleanup here.
1893                                  * Currently it's not an issue because there are
1894                                  * no dynamic config deletes...
1895                                  */
1896                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1897                                         ldap_pvt_thread_yield();
1898                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1899
1900                                 /* clean up if the caller is giving up */
1901                                 if ( op->o_abandon ) {
1902                                         modinst *m2;
1903                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1904                                                 m2 = m2->mi_next );
1905                                         m2->mi_next = mi->mi_next;
1906                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1907                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1908                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1909                                         return SLAPD_ABANDON;
1910                                 }
1911                         }
1912                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1913                 } else {
1914                         /* Record that we're modifying this entry now */
1915                         mt = ch_malloc( sizeof(modtarget) );
1916                         mt->mt_mods = mi;
1917                         mt->mt_tail = mi;
1918                         mt->mt_op = mi->mi_op;
1919                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1920                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1921                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1922                 }
1923         }
1924
1925         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1926                 syncprov_matchops( op, opc, 1 );
1927
1928         return SLAP_CB_CONTINUE;
1929 }
1930
1931 static int
1932 syncprov_op_extended( Operation *op, SlapReply *rs )
1933 {
1934         if ( exop_is_write( op ))
1935                 return syncprov_op_mod( op, rs );
1936
1937         return SLAP_CB_CONTINUE;
1938 }
1939
1940 typedef struct searchstate {
1941         slap_overinst *ss_on;
1942         syncops *ss_so;
1943         BerVarray ss_ctxcsn;
1944         int *ss_sids;
1945         int ss_numcsns;
1946 #define SS_PRESENT      0x01
1947 #define SS_CHANGED      0x02
1948         int ss_flags;
1949 } searchstate;
1950
1951 static int
1952 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1953 {
1954         if ( rs->sr_ctrls ) {
1955                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1956                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1957                 rs->sr_ctrls = NULL;
1958         }
1959         return 0;
1960 }
1961
1962 typedef struct SyncOperationBuffer {
1963         Operation               sob_op;
1964         Opheader                sob_hdr;
1965         OpExtra                 sob_oe;
1966         AttributeName   sob_extra;      /* not always present */
1967         /* Further data allocated here */
1968 } SyncOperationBuffer;
1969
1970 static void
1971 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1972 {
1973         SyncOperationBuffer *sopbuf2;
1974         Operation *op2;
1975         int i, alen = 0;
1976         size_t size;
1977         char *ptr;
1978         GroupAssertion *g1, *g2;
1979
1980         /* count the search attrs */
1981         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1982                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1983         }
1984         /* Make a new copy of the operation */
1985         size = offsetof( SyncOperationBuffer, sob_extra ) +
1986                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1987                 op->o_req_dn.bv_len + 1 +
1988                 op->o_req_ndn.bv_len + 1 +
1989                 op->o_ndn.bv_len + 1 +
1990                 so->s_filterstr.bv_len + 1;
1991         sopbuf2 = ch_calloc( 1, size );
1992         op2 = &sopbuf2->sob_op;
1993         op2->o_hdr = &sopbuf2->sob_hdr;
1994         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1995
1996         /* Copy the fields we care about explicitly, leave the rest alone */
1997         *op2->o_hdr = *op->o_hdr;
1998         op2->o_tag = op->o_tag;
1999         op2->o_time = op->o_time;
2000         op2->o_bd = on->on_info->oi_origdb;
2001         op2->o_request = op->o_request;
2002         op2->o_managedsait = op->o_managedsait;
2003         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2004         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2005
2006         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2007         if ( i ) {
2008                 op2->ors_attrs = (AttributeName *) ptr;
2009                 ptr = (char *) &op2->ors_attrs[i+1];
2010                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2011                         op2->ors_attrs[i] = op->ors_attrs[i];
2012                         op2->ors_attrs[i].an_name.bv_val = ptr;
2013                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2014                 }
2015                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2016         }
2017
2018         op2->o_authz = op->o_authz;
2019         op2->o_ndn.bv_val = ptr;
2020         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2021         op2->o_dn = op2->o_ndn;
2022         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2023         op2->o_req_dn.bv_val = ptr;
2024         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2025         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2026         op2->o_req_ndn.bv_val = ptr;
2027         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2028         op2->ors_filterstr.bv_val = ptr;
2029         strcpy( ptr, so->s_filterstr.bv_val );
2030         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2031
2032         /* Skip the AND/GE clause that we stuck on in front */
2033         if ( so->s_flags & PS_FIX_FILTER ) {
2034                 op2->ors_filter = op->ors_filter->f_and->f_next;
2035                 so->s_flags ^= PS_FIX_FILTER;
2036         } else {
2037                 op2->ors_filter = op->ors_filter;
2038         }
2039         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2040         so->s_op = op2;
2041
2042         /* Copy any cached group ACLs individually */
2043         op2->o_groups = NULL;
2044         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2045                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2046                 *g2 = *g1;
2047                 strcpy( g2->ga_ndn, g1->ga_ndn );
2048                 g2->ga_next = op2->o_groups;
2049                 op2->o_groups = g2;
2050         }
2051         /* Don't allow any further group caching */
2052         op2->o_do_not_cache = 1;
2053
2054         /* Add op2 to conn so abandon will find us */
2055         op->o_conn->c_n_ops_executing++;
2056         op->o_conn->c_n_ops_completed--;
2057         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2058         so->s_flags |= PS_IS_DETACHED;
2059
2060         /* Prevent anyone else from trying to send a result for this op */
2061         op->o_abandon = 1;
2062 }
2063
2064 static int
2065 syncprov_search_response( Operation *op, SlapReply *rs )
2066 {
2067         searchstate *ss = op->o_callback->sc_private;
2068         slap_overinst *on = ss->ss_on;
2069         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2070         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2071
2072         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2073                 Attribute *a;
2074                 /* If we got a referral without a referral object, there's
2075                  * something missing that we cannot replicate. Just ignore it.
2076                  * The consumer will abort because we didn't send the expected
2077                  * control.
2078                  */
2079                 if ( !rs->sr_entry ) {
2080                         assert( rs->sr_entry != NULL );
2081                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2082                         return SLAP_CB_CONTINUE;
2083                 }
2084                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2085                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2086                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2087                 }
2088                 if ( a ) {
2089                         int i, sid;
2090                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2091
2092                         /* Don't send changed entries back to the originator */
2093                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2094                                 Debug( LDAP_DEBUG_SYNC,
2095                                         "Entry %s changed by peer, ignored\n",
2096                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2097                                 return LDAP_SUCCESS;
2098                         }
2099
2100                         /* If not a persistent search */
2101                         if ( !ss->ss_so ) {
2102                                 /* Make sure entry is less than the snapshot'd contextCSN */
2103                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2104                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2105                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2106                                                 Debug( LDAP_DEBUG_SYNC,
2107                                                         "Entry %s CSN %s greater than snapshot %s\n",
2108                                                         rs->sr_entry->e_name.bv_val,
2109                                                         a->a_nvals[0].bv_val,
2110                                                         ss->ss_ctxcsn[i].bv_val );
2111                                                 return LDAP_SUCCESS;
2112                                         }
2113                                 }
2114                         }
2115
2116                         /* Don't send old entries twice */
2117                         if ( srs->sr_state.ctxcsn ) {
2118                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2119                                         if ( sid == srs->sr_state.sids[i] &&
2120                                                 ber_bvcmp( &a->a_nvals[0],
2121                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2122                                                 Debug( LDAP_DEBUG_SYNC,
2123                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2124                                                         rs->sr_entry->e_name.bv_val,
2125                                                         a->a_nvals[0].bv_val,
2126                                                         srs->sr_state.ctxcsn[i].bv_val );
2127                                                 return LDAP_SUCCESS;
2128                                         }
2129                                 }
2130                         }
2131                 }
2132                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2133                         op->o_tmpmemctx );
2134                 rs->sr_ctrls[1] = NULL;
2135                 /* If we're in delta-sync mode, always send a cookie */
2136                 if ( si->si_nopres && si->si_usehint && a ) {
2137                         struct berval cookie;
2138                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2139                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2140                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2141                 } else {
2142                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2143                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2144                 }
2145         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2146                 struct berval cookie;
2147
2148                 if ( ss->ss_flags & SS_CHANGED ) {
2149                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2150                                 srs->sr_state.rid, srs->sr_state.sid );
2151
2152                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2153                 }
2154
2155                 /* Is this a regular refresh?
2156                  * Note: refresh never gets here if there were no changes
2157                  */
2158                 if ( !ss->ss_so ) {
2159                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2160                                 op->o_tmpmemctx );
2161                         rs->sr_ctrls[1] = NULL;
2162                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2163                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2164                                         LDAP_SYNC_REFRESH_DELETES );
2165                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2166                 } else {
2167                 /* It's RefreshAndPersist, transition to Persist phase */
2168                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2169                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2170                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2171                                 1, NULL, 0 );
2172                         if ( ss->ss_flags & SS_CHANGED )
2173                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2174
2175                         /* Detach this Op from frontend control */
2176                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2177
2178                         /* But not if this connection was closed along the way */
2179                         if ( op->o_abandon ) {
2180                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2181                                 /* syncprov_ab_cleanup will free this syncop */
2182                                 return SLAPD_ABANDON;
2183
2184                         } else {
2185                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2186                                 /* Turn off the refreshing flag */
2187                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2188
2189                                 syncprov_detach_op( op, ss->ss_so, on );
2190
2191                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2192
2193                                 /* If there are queued responses, fire them off */
2194                                 if ( ss->ss_so->s_res )
2195                                         syncprov_qstart( ss->ss_so );
2196                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2197                         }
2198
2199                         return LDAP_SUCCESS;
2200                 }
2201         }
2202
2203         return SLAP_CB_CONTINUE;
2204 }
2205
2206 static int
2207 syncprov_op_search( Operation *op, SlapReply *rs )
2208 {
2209         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2210         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2211         slap_callback   *cb;
2212         int gotstate = 0, changed = 0, do_present = 0;
2213         syncops *sop = NULL;
2214         searchstate *ss;
2215         sync_control *srs;
2216         BerVarray ctxcsn;
2217         int i, *sids, numcsns;
2218         struct berval mincsn;
2219
2220         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2221
2222         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2223                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2224                 return rs->sr_err;
2225         }
2226
2227         srs = op->o_controls[slap_cids.sc_LDAPsync];
2228
2229         /* If this is a persistent search, set it up right away */
2230         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2231                 syncops so = {0};
2232                 fbase_cookie fc;
2233                 opcookie opc;
2234                 slap_callback sc;
2235
2236                 fc.fss = &so;
2237                 fc.fbase = 0;
2238                 so.s_eid = NOID;
2239                 so.s_op = op;
2240                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2241                 /* syncprov_findbase expects to be called as a callback... */
2242                 sc.sc_private = &opc;
2243                 opc.son = on;
2244                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2245                 cb = op->o_callback;
2246                 op->o_callback = &sc;
2247                 rs->sr_err = syncprov_findbase( op, &fc );
2248                 op->o_callback = cb;
2249                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2250
2251                 if ( rs->sr_err != LDAP_SUCCESS ) {
2252                         send_ldap_result( op, rs );
2253                         return rs->sr_err;
2254                 }
2255                 sop = ch_malloc( sizeof( syncops ));
2256                 *sop = so;
2257                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2258                 sop->s_rid = srs->sr_state.rid;
2259                 sop->s_sid = srs->sr_state.sid;
2260                 sop->s_inuse = 1;
2261
2262                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2263                 sop->s_next = si->si_ops;
2264                 si->si_ops = sop;
2265                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2266         }
2267
2268         /* snapshot the ctxcsn */
2269         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2270         numcsns = si->si_numcsns;
2271         if ( numcsns ) {
2272                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2273                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2274                 for ( i=0; i<numcsns; i++ )
2275                         sids[i] = si->si_sids[i];
2276         } else {
2277                 ctxcsn = NULL;
2278                 sids = NULL;
2279         }
2280         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2281
2282         /* If we have a cookie, handle the PRESENT lookups */
2283         if ( srs->sr_state.ctxcsn ) {
2284                 sessionlog *sl;
2285                 int i, j;
2286
2287                 /* If we don't have any CSN of our own yet, pretend nothing
2288                  * has changed.
2289                  */
2290                 if ( !numcsns )
2291                         goto no_change;
2292
2293                 if ( !si->si_nopres )
2294                         do_present = SS_PRESENT;
2295
2296                 /* If there are SIDs we don't recognize in the cookie, drop them */
2297                 for (i=0; i<srs->sr_state.numcsns; ) {
2298                         for (j=0; j<numcsns; j++) {
2299                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2300                                         break;
2301                                 }
2302                         }
2303                         /* not found */
2304                         if ( j == numcsns ) {
2305                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2306                                 j = srs->sr_state.numcsns - 1;
2307                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2308                                 tmp.bv_len = 0;
2309                                 srs->sr_state.ctxcsn[j] = tmp;
2310                                 srs->sr_state.numcsns = j;
2311                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2312                                 continue;
2313                         }
2314                         i++;
2315                 }
2316
2317                 /* Find the smallest CSN */
2318                 mincsn = srs->sr_state.ctxcsn[0];
2319                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2320                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2321                                 mincsn = srs->sr_state.ctxcsn[i];
2322                 }
2323
2324                 /* If nothing has changed, shortcut it */
2325                 if ( srs->sr_state.numcsns == numcsns ) {
2326                         int i, j;
2327                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2328                                 for ( j=0; j<numcsns; j++ ) {
2329                                         if ( srs->sr_state.sids[i] != sids[j] )
2330                                                 continue;
2331                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2332                                                 changed = SS_CHANGED;
2333                                         break;
2334                                 }
2335                                 if ( changed )
2336                                         break;
2337                         }
2338                         if ( !changed ) {
2339                                 do_present = 0;
2340 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2341                                         LDAPControl     *ctrls[2];
2342
2343                                         ctrls[0] = NULL;
2344                                         ctrls[1] = NULL;
2345                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2346                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2347                                         rs->sr_ctrls = ctrls;
2348                                         rs->sr_err = LDAP_SUCCESS;
2349                                         send_ldap_result( op, rs );
2350                                         rs->sr_ctrls = NULL;
2351                                         return rs->sr_err;
2352                                 }
2353                                 goto shortcut;
2354                         }
2355                 } else {
2356                         /* consumer doesn't have the right number of CSNs */
2357                         changed = SS_CHANGED;
2358                 }
2359                 /* Do we have a sessionlog for this search? */
2360                 sl=si->si_logs;
2361                 if ( sl ) {
2362                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2363                         /* Are there any log entries, and is the consumer state
2364                          * present in the session log?
2365                          */
2366                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2367                                 do_present = 0;
2368                                 /* mutex is unlocked in playlog */
2369                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2370                         } else {
2371                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2372                         }
2373                 }
2374                 /* Is the CSN still present in the database? */
2375                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2376                         /* No, so a reload is required */
2377                         /* the 2.2 consumer doesn't send this hint */
2378                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2379                                 if ( ctxcsn )
2380                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2381                                 if ( sids )
2382                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2383                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2384                                 return rs->sr_err;
2385                         }
2386                         if ( srs->sr_state.ctxcsn ) {
2387                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2388                                 srs->sr_state.ctxcsn = NULL;
2389                         }
2390                         if ( srs->sr_state.sids ) {
2391                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2392                                 srs->sr_state.sids = NULL;
2393                         }
2394                         srs->sr_state.numcsns = 0;
2395                 } else {
2396                         gotstate = 1;
2397                         /* If changed and doing Present lookup, send Present UUIDs */
2398                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2399                                 LDAP_SUCCESS ) {
2400                                 if ( ctxcsn )
2401                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2402                                 if ( sids )
2403                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2404                                 send_ldap_result( op, rs );
2405                                 return rs->sr_err;
2406                         }
2407                 }
2408         } else {
2409                 /* No consumer state, assume something has changed */
2410                 changed = SS_CHANGED;
2411         }
2412
2413 shortcut:
2414         /* Append CSN range to search filter, save original filter
2415          * for persistent search evaluation
2416          */
2417         if ( sop ) {
2418                 sop->s_filterstr= op->ors_filterstr;
2419         }
2420
2421         /* If something changed, find the changes */
2422         if ( gotstate && changed ) {
2423                 Filter *fand, *fava;
2424
2425                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2426                 fand->f_choice = LDAP_FILTER_AND;
2427                 fand->f_next = NULL;
2428                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2429                 fand->f_and = fava;
2430                 fava->f_choice = LDAP_FILTER_GE;
2431                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2432                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2433 #ifdef LDAP_COMP_MATCH
2434                 fava->f_ava->aa_cf = NULL;
2435 #endif
2436                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2437                 fava->f_next = op->ors_filter;
2438                 op->ors_filter = fand;
2439                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2440                 if ( sop )
2441                         sop->s_flags |= PS_FIX_FILTER;
2442         }
2443
2444         /* Let our callback add needed info to returned entries */
2445         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2446         ss = (searchstate *)(cb+1);
2447         ss->ss_on = on;
2448         ss->ss_so = sop;
2449         ss->ss_flags = do_present | changed;
2450         ss->ss_ctxcsn = ctxcsn;
2451         ss->ss_numcsns = numcsns;
2452         ss->ss_sids = sids;
2453         cb->sc_response = syncprov_search_response;
2454         cb->sc_cleanup = syncprov_search_cleanup;
2455         cb->sc_private = ss;
2456         cb->sc_next = op->o_callback;
2457         op->o_callback = cb;
2458
2459         /* If this is a persistent search and no changes were reported during
2460          * the refresh phase, just invoke the response callback to transition
2461          * us into persist phase
2462          */
2463         if ( !changed ) {
2464                 rs->sr_err = LDAP_SUCCESS;
2465                 rs->sr_nentries = 0;
2466                 send_ldap_result( op, rs );
2467                 return rs->sr_err;
2468         }
2469         return SLAP_CB_CONTINUE;
2470 }
2471
2472 static int
2473 syncprov_operational(
2474         Operation *op,
2475         SlapReply *rs )
2476 {
2477         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2478         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2479
2480         /* This prevents generating unnecessarily; frontend will strip
2481          * any statically stored copy.
2482          */
2483         if ( op->o_sync != SLAP_CONTROL_NONE )
2484                 return SLAP_CB_CONTINUE;
2485
2486         if ( rs->sr_entry &&
2487                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2488
2489                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2490                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2491                         Attribute *a, **ap = NULL;
2492
2493                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2494                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2495                                         break;
2496                         }
2497
2498                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2499                         if ( si->si_ctxcsn ) {
2500                                 if ( !a ) {
2501                                         for ( ap = &rs->sr_operational_attrs; *ap;
2502                                                 ap=&(*ap)->a_next );
2503
2504                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2505                                         *ap = a;
2506                                 }
2507
2508                                 if ( !ap ) {
2509                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2510                                                 Entry *e = entry_dup( rs->sr_entry );
2511                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2512                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2513                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2514                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2515                                                         entry_free( rs->sr_entry );
2516                                                 }
2517                                                 rs->sr_entry = e;
2518                                                 rs->sr_flags |=
2519                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2520                                                 a = attr_find( rs->sr_entry->e_attrs,
2521                                                         slap_schema.si_ad_contextCSN );
2522                                         }
2523                                         if ( a->a_nvals != a->a_vals ) {
2524                                                 ber_bvarray_free( a->a_nvals );
2525                                         }
2526                                         a->a_nvals = NULL;
2527                                         ber_bvarray_free( a->a_vals );
2528                                         a->a_vals = NULL;
2529                                         a->a_numvals = 0;
2530                                 }
2531                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2532                         }
2533                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2534                 }
2535         }
2536         return SLAP_CB_CONTINUE;
2537 }
2538
2539 enum {
2540         SP_CHKPT = 1,
2541         SP_SESSL,
2542         SP_NOPRES,
2543         SP_USEHINT
2544 };
2545
2546 static ConfigDriver sp_cf_gen;
2547
2548 static ConfigTable spcfg[] = {
2549         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2550                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2551                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2552                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2553         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2554                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2555                         "DESC 'Session log size in ops' "
2556                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2557         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2558                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2559                         "DESC 'Omit Present phase processing' "
2560                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2561         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2562                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2563                         "DESC 'Observe Reload Hint in Request control' "
2564                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2565         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2566 };
2567
2568 static ConfigOCs spocs[] = {
2569         { "( OLcfgOvOc:1.1 "
2570                 "NAME 'olcSyncProvConfig' "
2571                 "DESC 'SyncRepl Provider configuration' "
2572                 "SUP olcOverlayConfig "
2573                 "MAY ( olcSpCheckpoint "
2574                         "$ olcSpSessionlog "
2575                         "$ olcSpNoPresent "
2576                         "$ olcSpReloadHint "
2577                 ") )",
2578                         Cft_Overlay, spcfg },
2579         { NULL, 0, NULL }
2580 };
2581
2582 static int
2583 sp_cf_gen(ConfigArgs *c)
2584 {
2585         slap_overinst           *on = (slap_overinst *)c->bi;
2586         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2587         int rc = 0;
2588
2589         if ( c->op == SLAP_CONFIG_EMIT ) {
2590                 switch ( c->type ) {
2591                 case SP_CHKPT:
2592                         if ( si->si_chkops || si->si_chktime ) {
2593                                 struct berval bv;
2594                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2595                                         "%d %d", si->si_chkops, si->si_chktime );
2596                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2597                                         rc = 1;
2598                                 } else {
2599                                         bv.bv_val = c->cr_msg;
2600                                         value_add_one( &c->rvalue_vals, &bv );
2601                                 }
2602                         } else {
2603                                 rc = 1;
2604                         }
2605                         break;
2606                 case SP_SESSL:
2607                         if ( si->si_logs ) {
2608                                 c->value_int = si->si_logs->sl_size;
2609                         } else {
2610                                 rc = 1;
2611                         }
2612                         break;
2613                 case SP_NOPRES:
2614                         if ( si->si_nopres ) {
2615                                 c->value_int = 1;
2616                         } else {
2617                                 rc = 1;
2618                         }
2619                         break;
2620                 case SP_USEHINT:
2621                         if ( si->si_usehint ) {
2622                                 c->value_int = 1;
2623                         } else {
2624                                 rc = 1;
2625                         }
2626                         break;
2627                 }
2628                 return rc;
2629         } else if ( c->op == LDAP_MOD_DELETE ) {
2630                 switch ( c->type ) {
2631                 case SP_CHKPT:
2632                         si->si_chkops = 0;
2633                         si->si_chktime = 0;
2634                         break;
2635                 case SP_SESSL:
2636                         if ( si->si_logs )
2637                                 si->si_logs->sl_size = 0;
2638                         else
2639                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2640                         break;
2641                 case SP_NOPRES:
2642                         if ( si->si_nopres )
2643                                 si->si_nopres = 0;
2644                         else
2645                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2646                         break;
2647                 case SP_USEHINT:
2648                         if ( si->si_usehint )
2649                                 si->si_usehint = 0;
2650                         else
2651                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2652                         break;
2653                 }
2654                 return rc;
2655         }
2656         switch ( c->type ) {
2657         case SP_CHKPT:
2658                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2659                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2660                                 c->argv[0], c->argv[1] );
2661                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2662                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2663                         return ARG_BAD_CONF;
2664                 }
2665                 if ( si->si_chkops <= 0 ) {
2666                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2667                                 c->argv[0], si->si_chkops );
2668                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2669                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2670                         return ARG_BAD_CONF;
2671                 }
2672                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2673                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2674                                 c->argv[0], c->argv[1] );
2675                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2676                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2677                         return ARG_BAD_CONF;
2678                 }
2679                 if ( si->si_chktime <= 0 ) {
2680                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2681                                 c->argv[0], si->si_chkops );
2682                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2683                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2684                         return ARG_BAD_CONF;
2685                 }
2686                 si->si_chktime *= 60;
2687                 break;
2688         case SP_SESSL: {
2689                 sessionlog *sl;
2690                 int size = c->value_int;
2691
2692                 if ( size < 0 ) {
2693                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2694                                 c->argv[0], size );
2695                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2696                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2697                         return ARG_BAD_CONF;
2698                 }
2699                 sl = si->si_logs;
2700                 if ( !sl ) {
2701                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2702                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2703                         sl->sl_mincsn.bv_len = 0;
2704                         sl->sl_num = 0;
2705                         sl->sl_head = sl->sl_tail = NULL;
2706                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2707                         si->si_logs = sl;
2708                 }
2709                 sl->sl_size = size;
2710                 }
2711                 break;
2712         case SP_NOPRES:
2713                 si->si_nopres = c->value_int;
2714                 break;
2715         case SP_USEHINT:
2716                 si->si_usehint = c->value_int;
2717                 break;
2718         }
2719         return rc;
2720 }
2721
2722 /* ITS#3456 we cannot run this search on the main thread, must use a
2723  * child thread in order to insure we have a big enough stack.
2724  */
2725 static void *
2726 syncprov_db_otask(
2727         void *ptr
2728 )
2729 {
2730         syncprov_findcsn( ptr, FIND_MAXCSN );
2731         return NULL;
2732 }
2733
2734 /* Read any existing contextCSN from the underlying db.
2735  * Then search for any entries newer than that. If no value exists,
2736  * just generate it. Cache whatever result.
2737  */
2738 static int
2739 syncprov_db_open(
2740         BackendDB *be,
2741         ConfigReply *cr
2742 )
2743 {
2744         slap_overinst   *on = (slap_overinst *) be->bd_info;
2745         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2746
2747         Connection conn = { 0 };
2748         OperationBuffer opbuf;
2749         Operation *op;
2750         Entry *e = NULL;
2751         Attribute *a;
2752         int rc;
2753         void *thrctx = NULL;
2754
2755         if ( !SLAP_LASTMOD( be )) {
2756                 Debug( LDAP_DEBUG_ANY,
2757                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2758                 return -1;
2759         }
2760
2761         if ( slapMode & SLAP_TOOL_MODE ) {
2762                 return 0;
2763         }
2764
2765         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2766         if ( rc ) {
2767                 return rc;
2768         }
2769
2770         thrctx = ldap_pvt_thread_pool_context();
2771         connection_fake_init( &conn, &opbuf, thrctx );
2772         op = &opbuf.ob_op;
2773         op->o_bd = be;
2774         op->o_dn = be->be_rootdn;
2775         op->o_ndn = be->be_rootndn;
2776
2777         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2778                 slap_schema.si_ad_contextCSN, 0, &e, on );
2779
2780         if ( e ) {
2781                 ldap_pvt_thread_t tid;
2782
2783                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2784                 if ( a ) {
2785                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2786                         si->si_numcsns = a->a_numvals;
2787                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2788                 }
2789                 overlay_entry_release_ov( op, e, 0, on );
2790                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2791                         op->o_req_dn = be->be_suffix[0];
2792                         op->o_req_ndn = be->be_nsuffix[0];
2793                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2794                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2795                         ldap_pvt_thread_join( tid, NULL );
2796                 }
2797         }
2798
2799         /* Didn't find a contextCSN, should we generate one? */
2800         if ( !si->si_ctxcsn ) {
2801                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2802                 struct berval csn;
2803
2804                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2805                 /* If we're also a consumer, then don't generate anything.
2806                  * Wait for our provider to send it to us, or for a local
2807                  * modify if we have multimaster.
2808                  */
2809                         goto out;
2810                 }
2811                 csn.bv_val = csnbuf;
2812                 csn.bv_len = sizeof( csnbuf );
2813                 slap_get_csn( op, &csn, 0 );
2814                 value_add_one( &si->si_ctxcsn, &csn );
2815                 si->si_numcsns = 1;
2816                 si->si_sids = ch_malloc( sizeof(int) );
2817                 si->si_sids[0] = slap_serverID;
2818
2819                 /* make sure we do a checkpoint on close */
2820                 si->si_numops++;
2821         }
2822
2823 out:
2824         op->o_bd->bd_info = (BackendInfo *)on;
2825         return 0;
2826 }
2827
2828 /* Write the current contextCSN into the underlying db.
2829  */
2830 static int
2831 syncprov_db_close(
2832         BackendDB *be,
2833         ConfigReply *cr
2834 )
2835 {
2836     slap_overinst   *on = (slap_overinst *) be->bd_info;
2837     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2838
2839         if ( slapMode & SLAP_TOOL_MODE ) {
2840                 return 0;
2841         }
2842         if ( si->si_numops ) {
2843                 Connection conn = {0};
2844                 OperationBuffer opbuf;
2845                 Operation *op;
2846                 SlapReply rs = {REP_RESULT};
2847                 void *thrctx;
2848
2849                 thrctx = ldap_pvt_thread_pool_context();
2850                 connection_fake_init( &conn, &opbuf, thrctx );
2851                 op = &opbuf.ob_op;
2852                 op->o_bd = be;
2853                 op->o_dn = be->be_rootdn;
2854                 op->o_ndn = be->be_rootndn;
2855                 syncprov_checkpoint( op, &rs, on );
2856         }
2857
2858     return 0;
2859 }
2860
2861 static int
2862 syncprov_db_init(
2863         BackendDB *be,
2864         ConfigReply *cr
2865 )
2866 {
2867         slap_overinst   *on = (slap_overinst *)be->bd_info;
2868         syncprov_info_t *si;
2869
2870         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2871                 Debug( LDAP_DEBUG_ANY,
2872                         "syncprov must be instantiated within a database.\n",
2873                         0, 0, 0 );
2874                 return 1;
2875         }
2876
2877         si = ch_calloc(1, sizeof(syncprov_info_t));
2878         on->on_bi.bi_private = si;
2879         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2880         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2881         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2882
2883         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2884         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2885         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2886         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2887
2888         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2889         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2890
2891         return 0;
2892 }
2893
2894 static int
2895 syncprov_db_destroy(
2896         BackendDB *be,
2897         ConfigReply *cr
2898 )
2899 {
2900         slap_overinst   *on = (slap_overinst *)be->bd_info;
2901         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2902
2903         if ( si ) {
2904                 if ( si->si_logs ) {
2905                         slog_entry *se = si->si_logs->sl_head;
2906
2907                         while ( se ) {
2908                                 slog_entry *se_next = se->se_next;
2909                                 ch_free( se );
2910                                 se = se_next;
2911                         }
2912
2913                         ch_free( si->si_logs );
2914                 }
2915                 if ( si->si_ctxcsn )
2916                         ber_bvarray_free( si->si_ctxcsn );
2917                 if ( si->si_sids )
2918                         ch_free( si->si_sids );
2919                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2920                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2921                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2922                 ch_free( si );
2923         }
2924
2925         return 0;
2926 }
2927
2928 static int syncprov_parseCtrl (
2929         Operation *op,
2930         SlapReply *rs,
2931         LDAPControl *ctrl )
2932 {
2933         ber_tag_t tag;
2934         BerElementBuffer berbuf;
2935         BerElement *ber = (BerElement *)&berbuf;
2936         ber_int_t mode;
2937         ber_len_t len;
2938         struct berval cookie = BER_BVNULL;
2939         sync_control *sr;
2940         int rhint = 0;
2941
2942         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2943                 rs->sr_text = "Sync control specified multiple times";
2944                 return LDAP_PROTOCOL_ERROR;
2945         }
2946
2947         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2948                 rs->sr_text = "Sync control specified with pagedResults control";
2949                 return LDAP_PROTOCOL_ERROR;
2950         }
2951
2952         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2953                 rs->sr_text = "Sync control value is absent";
2954                 return LDAP_PROTOCOL_ERROR;
2955         }
2956
2957         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2958                 rs->sr_text = "Sync control value is empty";
2959                 return LDAP_PROTOCOL_ERROR;
2960         }
2961
2962         /* Parse the control value
2963          *      syncRequestValue ::= SEQUENCE {
2964          *              mode   ENUMERATED {
2965          *                      -- 0 unused
2966          *                      refreshOnly             (1),
2967          *                      -- 2 reserved
2968          *                      refreshAndPersist       (3)
2969          *              },
2970          *              cookie  syncCookie OPTIONAL
2971          *      }
2972          */
2973
2974         ber_init2( ber, &ctrl->ldctl_value, 0 );
2975
2976         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2977                 rs->sr_text = "Sync control : mode decoding error";
2978                 return LDAP_PROTOCOL_ERROR;
2979         }
2980
2981         switch( mode ) {
2982         case LDAP_SYNC_REFRESH_ONLY:
2983                 mode = SLAP_SYNC_REFRESH;
2984                 break;
2985         case LDAP_SYNC_REFRESH_AND_PERSIST:
2986                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2987                 break;
2988         default:
2989                 rs->sr_text = "Sync control : unknown update mode";
2990                 return LDAP_PROTOCOL_ERROR;
2991         }
2992
2993         tag = ber_peek_tag( ber, &len );
2994
2995         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2996                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2997                         rs->sr_text = "Sync control : cookie decoding error";
2998                         return LDAP_PROTOCOL_ERROR;
2999                 }
3000                 tag = ber_peek_tag( ber, &len );
3001         }
3002         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3003                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3004                         rs->sr_text = "Sync control : rhint decoding error";
3005                         return LDAP_PROTOCOL_ERROR;
3006                 }
3007         }
3008         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3009                         rs->sr_text = "Sync control : decoding error";
3010                         return LDAP_PROTOCOL_ERROR;
3011         }
3012         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3013         sr->sr_rhint = rhint;
3014         if (!BER_BVISNULL(&cookie)) {
3015                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3016                 /* If parse fails, pretend no cookie was sent */
3017                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3018                         sr->sr_state.rid == -1 ) {
3019                         if ( sr->sr_state.ctxcsn ) {
3020                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3021                                 sr->sr_state.ctxcsn = NULL;
3022                         }
3023                         sr->sr_state.numcsns = 0;
3024                 }
3025         }
3026
3027         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3028
3029         op->o_sync = ctrl->ldctl_iscritical
3030                 ? SLAP_CONTROL_CRITICAL
3031                 : SLAP_CONTROL_NONCRITICAL;
3032
3033         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3034
3035         return LDAP_SUCCESS;
3036 }
3037
3038 /* This overlay is set up for dynamic loading via moduleload. For static
3039  * configuration, you'll need to arrange for the slap_overinst to be
3040  * initialized and registered by some other function inside slapd.
3041  */
3042
3043 static slap_overinst            syncprov;
3044
3045 int
3046 syncprov_initialize()
3047 {
3048         int rc;
3049
3050         rc = register_supported_control( LDAP_CONTROL_SYNC,
3051                 SLAP_CTRL_SEARCH, NULL,
3052                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3053         if ( rc != LDAP_SUCCESS ) {
3054                 Debug( LDAP_DEBUG_ANY,
3055                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3056                 return rc;
3057         }
3058
3059         syncprov.on_bi.bi_type = "syncprov";
3060         syncprov.on_bi.bi_db_init = syncprov_db_init;
3061         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3062         syncprov.on_bi.bi_db_open = syncprov_db_open;
3063         syncprov.on_bi.bi_db_close = syncprov_db_close;
3064
3065         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3066         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3067
3068         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3069         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3070         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3071         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3072         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3073         syncprov.on_bi.bi_op_search = syncprov_op_search;
3074         syncprov.on_bi.bi_extended = syncprov_op_extended;
3075         syncprov.on_bi.bi_operational = syncprov_operational;
3076
3077         syncprov.on_bi.bi_cf_ocs = spocs;
3078
3079         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3080
3081         rc = config_register_schema( spcfg, spocs );
3082         if ( rc ) return rc;
3083
3084         return overlay_register( &syncprov );
3085 }
3086
3087 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3088 int
3089 init_module( int argc, char *argv[] )
3090 {
3091         return syncprov_initialize();
3092 }
3093 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3094
3095 #endif /* defined(SLAPD_OVER_SYNCPROV) */