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 2004-2013 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         struct berval mt_dn;
  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         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  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         BerVarray       sl_mincsn;
 117         int             *sl_sids;
 118         int             sl_numcsns;
 119         int             sl_num;
 120         int             sl_size;
 121         slog_entry *sl_head;
 122         slog_entry *sl_tail;
 123         ldap_pvt_thread_mutex_t sl_mutex;
 124 } sessionlog;
 125
 126 /* The main state for this overlay */
 127 typedef struct syncprov_info_t {
 128         syncops         *si_ops;
 129         struct berval   si_contextdn;
 130         BerVarray       si_ctxcsn;      /* ldapsync context */
 131         int             *si_sids;
 132         int             si_numcsns;
 133         int             si_chkops;      /* checkpointing info */
 134         int             si_chktime;
 135         int             si_numops;      /* number of ops since last checkpoint */
 136         int             si_nopres;      /* Skip present phase */
 137         int             si_usehint;     /* use reload hint */
 138         int             si_active;      /* True if there are active mods */
 139         int             si_dirty;       /* True if the context is dirty, i.e changes
 140                                                  * have been made without updating the csn. */
 141         time_t  si_chklast;     /* time of last checkpoint */
 142         Avlnode *si_mods;       /* entries being modified */
 143         sessionlog      *si_logs;
 144         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 145         ldap_pvt_thread_mutex_t si_ops_mutex;
 146         ldap_pvt_thread_mutex_t si_mods_mutex;
 147         ldap_pvt_thread_mutex_t si_resp_mutex;
 148 } syncprov_info_t;
 149
 150 typedef struct opcookie {
 151         slap_overinst *son;
 152         syncmatches *smatches;
 153         modtarget *smt;
 154         Entry *se;
 155         struct berval sdn;      /* DN of entry, for deletes */
 156         struct berval sndn;
 157         struct berval suuid;    /* UUID of entry */
 158         struct berval sctxcsn;
 159         short osid;     /* sid of op csn */
 160         short rsid;     /* sid of relay */
 161         short sreference;       /* Is the entry a reference? */
 162 } opcookie;
 163
 164 typedef struct mutexint {
 165         ldap_pvt_thread_mutex_t mi_mutex;
 166         int mi_int;
 167 } mutexint;
 168
 169 typedef struct fbase_cookie {
 170         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 171         syncops *fss;   /* persistent search we're testing against */
 172         int fbase;      /* if TRUE we found the search base and it's still valid */
 173         int fscope;     /* if TRUE then fdn is within the psearch scope */
 174 } fbase_cookie;
 175
 176 static AttributeName csn_anlist[3];
 177 static AttributeName uuid_anlist[2];
 178
 179 /* Build a LDAPsync intermediate state control */
 180 static int
 181 syncprov_state_ctrl(
 182         Operation       *op,
 183         SlapReply       *rs,
 184         Entry           *e,
 185         int             entry_sync_state,
 186         LDAPControl     **ctrls,
 187         int             num_ctrls,
 188         int             send_cookie,
 189         struct berval   *cookie )
 190 {
 191         Attribute* a;
 192         int ret;
 193
 194         BerElementBuffer berbuf;
 195         BerElement *ber = (BerElement *)&berbuf;
 196         LDAPControl *cp;
 197         struct berval bv;
 198         struct berval   entryuuid_bv = BER_BVNULL;
 199
 200         ber_init2( ber, 0, LBER_USE_DER );
 201         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 202
 203         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 204                 AttributeDescription *desc = a->a_desc;
 205                 if ( desc == slap_schema.si_ad_entryUUID ) {
 206                         entryuuid_bv = a->a_nvals[0];
 207                         break;
 208                 }
 209         }
 210
 211         /* FIXME: what if entryuuid is NULL or empty ? */
 212
 213         if ( send_cookie && cookie ) {
 214                 ber_printf( ber, "{eOON}",
 215                         entry_sync_state, &entryuuid_bv, cookie );
 216         } else {
 217                 ber_printf( ber, "{eON}",
 218                         entry_sync_state, &entryuuid_bv );
 219         }
 220
 221         ret = ber_flatten2( ber, &bv, 0 );
 222         if ( ret == 0 ) {
 223                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 224                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 225                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 226                 cp->ldctl_value.bv_val = (char *)&cp[1];
 227                 cp->ldctl_value.bv_len = bv.bv_len;
 228                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 229                 ctrls[num_ctrls] = cp;
 230         }
 231         ber_free_buf( ber );
 232
 233         if ( ret < 0 ) {
 234                 Debug( LDAP_DEBUG_TRACE,
 235                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 236                         ret, 0, 0 );
 237                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 238                 return LDAP_OTHER;
 239         }
 240
 241         return LDAP_SUCCESS;
 242 }
 243
 244 /* Build a LDAPsync final state control */
 245 static int
 246 syncprov_done_ctrl(
 247         Operation       *op,
 248         SlapReply       *rs,
 249         LDAPControl     **ctrls,
 250         int                     num_ctrls,
 251         int                     send_cookie,
 252         struct berval *cookie,
 253         int                     refreshDeletes )
 254 {
 255         int ret;
 256         BerElementBuffer berbuf;
 257         BerElement *ber = (BerElement *)&berbuf;
 258         LDAPControl *cp;
 259         struct berval bv;
 260
 261         ber_init2( ber, NULL, LBER_USE_DER );
 262         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 263
 264         ber_printf( ber, "{" );
 265         if ( send_cookie && cookie ) {
 266                 ber_printf( ber, "O", cookie );
 267         }
 268         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 269                 ber_printf( ber, "b", refreshDeletes );
 270         }
 271         ber_printf( ber, "N}" );
 272
 273         ret = ber_flatten2( ber, &bv, 0 );
 274         if ( ret == 0 ) {
 275                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 276                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 277                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 278                 cp->ldctl_value.bv_val = (char *)&cp[1];
 279                 cp->ldctl_value.bv_len = bv.bv_len;
 280                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 281                 ctrls[num_ctrls] = cp;
 282         }
 283
 284         ber_free_buf( ber );
 285
 286         if ( ret < 0 ) {
 287                 Debug( LDAP_DEBUG_TRACE,
 288                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 289                         ret, 0, 0 );
 290                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 291                 return LDAP_OTHER;
 292         }
 293
 294         return LDAP_SUCCESS;
 295 }
 296
 297 static int
 298 syncprov_sendinfo(
 299         Operation       *op,
 300         SlapReply       *rs,
 301         int                     type,
 302         struct berval *cookie,
 303         int                     refreshDone,
 304         BerVarray       syncUUIDs,
 305         int                     refreshDeletes )
 306 {
 307         BerElementBuffer berbuf;
 308         BerElement *ber = (BerElement *)&berbuf;
 309         struct berval rspdata;
 310
 311         int ret;
 312
 313         ber_init2( ber, NULL, LBER_USE_DER );
 314         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 315
 316         if ( type ) {
 317                 switch ( type ) {
 318                 case LDAP_TAG_SYNC_NEW_COOKIE:
 319                         ber_printf( ber, "tO", type, cookie );
 320                         break;
 321                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 322                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 323                         ber_printf( ber, "t{", type );
 324                         if ( cookie ) {
 325                                 ber_printf( ber, "O", cookie );
 326                         }
 327                         if ( refreshDone == 0 ) {
 328                                 ber_printf( ber, "b", refreshDone );
 329                         }
 330                         ber_printf( ber, "N}" );
 331                         break;
 332                 case LDAP_TAG_SYNC_ID_SET:
 333                         ber_printf( ber, "t{", type );
 334                         if ( cookie ) {
 335                                 ber_printf( ber, "O", cookie );
 336                         }
 337                         if ( refreshDeletes == 1 ) {
 338                                 ber_printf( ber, "b", refreshDeletes );
 339                         }
 340                         ber_printf( ber, "[W]", syncUUIDs );
 341                         ber_printf( ber, "N}" );
 342                         break;
 343                 default:
 344                         Debug( LDAP_DEBUG_TRACE,
 345                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 346                                 type, 0, 0 );
 347                         return LDAP_OTHER;
 348                 }
 349         }
 350
 351         ret = ber_flatten2( ber, &rspdata, 0 );
 352
 353         if ( ret < 0 ) {
 354                 Debug( LDAP_DEBUG_TRACE,
 355                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 356                         ret, 0, 0 );
 357                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 358                 return LDAP_OTHER;
 359         }
 360
 361         rs->sr_rspoid = LDAP_SYNC_INFO;
 362         rs->sr_rspdata = &rspdata;
 363         send_ldap_intermediate( op, rs );
 364         rs->sr_rspdata = NULL;
 365         ber_free_buf( ber );
 366
 367         return LDAP_SUCCESS;
 368 }
 369
 370 /* Find a modtarget in an AVL tree */
 371 static int
 372 sp_avl_cmp( const void *c1, const void *c2 )
 373 {
 374         const modtarget *m1, *m2;
 375         int rc;
 376
 377         m1 = c1; m2 = c2;
 378         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 379
 380         if ( rc ) return rc;
 381         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 382 }
 383
 384 /* syncprov_findbase:
 385  *   finds the true DN of the base of a search (with alias dereferencing) and
 386  * checks to make sure the base entry doesn't get replaced with a different
 387  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 388  * change is detected, any persistent search on this base must be terminated /
 389  * reloaded.
 390  *   On the first call, we just save the DN and entryID. On subsequent calls
 391  * we compare the DN and entryID with the saved values.
 392  */
 393 static int
 394 findbase_cb( Operation *op, SlapReply *rs )
 395 {
 396         slap_callback *sc = op->o_callback;
 397
 398         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 399                 fbase_cookie *fc = sc->sc_private;
 400
 401                 /* If no entryID, we're looking for the first time.
 402                  * Just store whatever we got.
 403                  */
 404                 if ( fc->fss->s_eid == NOID ) {
 405                         fc->fbase = 2;
 406                         fc->fss->s_eid = rs->sr_entry->e_id;
 407                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 408
 409                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 410                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 411
 412                 /* OK, the DN is the same and the entryID is the same. */
 413                         fc->fbase = 1;
 414                 }
 415         }
 416         if ( rs->sr_err != LDAP_SUCCESS ) {
 417                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 418         }
 419         return LDAP_SUCCESS;
 420 }
 421
 422 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 423 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 424
 425 static int
 426 syncprov_findbase( Operation *op, fbase_cookie *fc )
 427 {
 428         /* Use basic parameters from syncrepl search, but use
 429          * current op's threadctx / tmpmemctx
 430          */
 431         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 432         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 433                 slap_callback cb = {0};
 434                 Operation fop;
 435                 SlapReply frs = { REP_RESULT };
 436                 int rc;
 437
 438                 fc->fss->s_flags ^= PS_FIND_BASE;
 439                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 440
 441                 fop = *fc->fss->s_op;
 442
 443                 fop.o_bd = fop.o_bd->bd_self;
 444                 fop.o_hdr = op->o_hdr;
 445                 fop.o_time = op->o_time;
 446                 fop.o_tincr = op->o_tincr;
 447                 fop.o_extra = op->o_extra;
 448
 449                 cb.sc_response = findbase_cb;
 450                 cb.sc_private = fc;
 451
 452                 fop.o_sync_mode = 0;    /* turn off sync mode */
 453                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 454                 fop.o_callback = &cb;
 455                 LDAP_SLIST_INIT( &fop.o_extra );
 456                 fop.o_tag = LDAP_REQ_SEARCH;
 457                 fop.ors_scope = LDAP_SCOPE_BASE;
 458                 fop.ors_limit = NULL;
 459                 fop.ors_slimit = 1;
 460                 fop.ors_tlimit = SLAP_NO_LIMIT;
 461                 fop.ors_attrs = slap_anlist_no_attrs;
 462                 fop.ors_attrsonly = 1;
 463                 fop.ors_filter = &generic_filter;
 464                 fop.ors_filterstr = generic_filterstr;
 465
 466                 rc = fop.o_bd->be_search( &fop, &frs );
 467         } else {
 468                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 469                 fc->fbase = 1;
 470         }
 471
 472         /* After the first call, see if the fdn resides in the scope */
 473         if ( fc->fbase == 1 ) {
 474                 switch ( fc->fss->s_op->ors_scope ) {
 475                 case LDAP_SCOPE_BASE:
 476                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 477                         break;
 478                 case LDAP_SCOPE_ONELEVEL: {
 479                         struct berval pdn;
 480                         dnParent( fc->fdn, &pdn );
 481                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 482                         break; }
 483                 case LDAP_SCOPE_SUBTREE:
 484                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 485                         break;
 486                 case LDAP_SCOPE_SUBORDINATE:
 487                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 488                                 !dn_match( fc->fdn, &fc->fss->s_base );
 489                         break;
 490                 }
 491         }
 492
 493         if ( fc->fbase )
 494                 return LDAP_SUCCESS;
 495
 496         /* If entryID has changed, then the base of this search has
 497          * changed. Invalidate the psearch.
 498          */
 499         return LDAP_NO_SUCH_OBJECT;
 500 }
 501
 502 /* syncprov_findcsn:
 503  *   This function has three different purposes, but they all use a search
 504  * that filters on entryCSN so they're combined here.
 505  * 1: at startup time, after a contextCSN has been read from the database,
 506  * we search for all entries with CSN >= contextCSN in case the contextCSN
 507  * was not checkpointed at the previous shutdown.
 508  *
 509  * 2: when the current contextCSN is known and we have a sync cookie, we search
 510  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 511  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 512  *
 513  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 514  * CSN, and generate Present records for them. We always collect this result
 515  * in SyncID sets, even if there's only one match.
 516  */
 517 typedef enum find_csn_t {
 518         FIND_MAXCSN     = 1,
 519         FIND_CSN        = 2,
 520         FIND_PRESENT    = 3
 521 } find_csn_t;
 522
 523 static int
 524 findmax_cb( Operation *op, SlapReply *rs )
 525 {
 526         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 527                 struct berval *maxcsn = op->o_callback->sc_private;
 528                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 529                         slap_schema.si_ad_entryCSN );
 530
 531                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 532                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 533                         maxcsn->bv_len = a->a_vals[0].bv_len;
 534                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 535                 }
 536         }
 537         return LDAP_SUCCESS;
 538 }
 539
 540 static int
 541 findcsn_cb( Operation *op, SlapReply *rs )
 542 {
 543         slap_callback *sc = op->o_callback;
 544
 545         /* We just want to know that at least one exists, so it's OK if
 546          * we exceed the unchecked limit.
 547          */
 548         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 549                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 550                 sc->sc_private = (void *)1;
 551         }
 552         return LDAP_SUCCESS;
 553 }
 554
 555 /* Build a list of entryUUIDs for sending in a SyncID set */
 556
 557 #define UUID_LEN        16
 558
 559 typedef struct fpres_cookie {
 560         int num;
 561         BerVarray uuids;
 562         char *last;
 563 } fpres_cookie;
 564
 565 static int
 566 findpres_cb( Operation *op, SlapReply *rs )
 567 {
 568         slap_callback *sc = op->o_callback;
 569         fpres_cookie *pc = sc->sc_private;
 570         Attribute *a;
 571         int ret = SLAP_CB_CONTINUE;
 572
 573         switch ( rs->sr_type ) {
 574         case REP_SEARCH:
 575                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 576                 if ( a ) {
 577                         pc->uuids[pc->num].bv_val = pc->last;
 578                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 579                                 pc->uuids[pc->num].bv_len );
 580                         pc->num++;
 581                         pc->last = pc->uuids[pc->num].bv_val;
 582                         pc->uuids[pc->num].bv_val = NULL;
 583                 }
 584                 ret = LDAP_SUCCESS;
 585                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 586                         break;
 587                 /* FALLTHRU */
 588         case REP_RESULT:
 589                 ret = rs->sr_err;
 590                 if ( pc->num ) {
 591                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 592                                 0, pc->uuids, 0 );
 593                         pc->uuids[pc->num].bv_val = pc->last;
 594                         pc->num = 0;
 595                         pc->last = pc->uuids[0].bv_val;
 596                 }
 597                 break;
 598         default:
 599                 break;
 600         }
 601         return ret;
 602 }
 603
 604 static int
 605 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 606 {
 607         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 608         syncprov_info_t         *si = on->on_bi.bi_private;
 609
 610         slap_callback cb = {0};
 611         Operation fop;
 612         SlapReply frs = { REP_RESULT };
 613         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 614         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 615         struct berval maxcsn;
 616         Filter cf;
 617         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 618         fpres_cookie pcookie;
 619         sync_control *srs = NULL;
 620         struct slap_limits_set fc_limits;
 621         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 622         int maxid;
 623
 624         if ( mode != FIND_MAXCSN ) {
 625                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 626         }
 627
 628         fop = *op;
 629         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 630         /* We want pure entries, not referrals */
 631         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 632
 633         cf.f_ava = &eq;
 634         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 635         BER_BVZERO( &cf.f_av_value );
 636         cf.f_next = NULL;
 637
 638         fop.o_callback = &cb;
 639         fop.ors_limit = NULL;
 640         fop.ors_tlimit = SLAP_NO_LIMIT;
 641         fop.ors_filter = &cf;
 642         fop.ors_filterstr.bv_val = buf;
 643
 644 again:
 645         switch( mode ) {
 646         case FIND_MAXCSN:
 647                 cf.f_choice = LDAP_FILTER_GE;
 648                 /* If there are multiple CSNs, use the one with our serverID */
 649                 for ( i=0; i<si->si_numcsns; i++) {
 650                         if ( slap_serverID == si->si_sids[i] ) {
 651                                 maxid = i;
 652                                 break;
 653                         }
 654                 }
 655                 if ( i == si->si_numcsns ) {
 656                         /* No match: this is multimaster, and none of the content in the DB
 657                          * originated locally. Treat like no CSN.
 658                          */
 659                         return LDAP_NO_SUCH_OBJECT;
 660                 }
 661                 cf.f_av_value = si->si_ctxcsn[maxid];
 662                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 663                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 664                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 665                         return LDAP_OTHER;
 666                 }
 667                 fop.ors_attrsonly = 0;
 668                 fop.ors_attrs = csn_anlist;
 669                 fop.ors_slimit = SLAP_NO_LIMIT;
 670                 cb.sc_private = &maxcsn;
 671                 cb.sc_response = findmax_cb;
 672                 strcpy( cbuf, cf.f_av_value.bv_val );
 673                 maxcsn.bv_val = cbuf;
 674                 maxcsn.bv_len = cf.f_av_value.bv_len;
 675                 break;
 676         case FIND_CSN:
 677                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 678                         cf.f_av_value = *csn;
 679                 }
 680                 fop.o_dn = op->o_bd->be_rootdn;
 681                 fop.o_ndn = op->o_bd->be_rootndn;
 682                 fop.o_req_dn = op->o_bd->be_suffix[0];
 683                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 684                 /* Look for exact match the first time */
 685                 if ( findcsn_retry ) {
 686                         cf.f_choice = LDAP_FILTER_EQUALITY;
 687                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 688                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 689                 /* On retry, look for <= */
 690                 } else {
 691                         cf.f_choice = LDAP_FILTER_LE;
 692                         fop.ors_limit = &fc_limits;
 693                         memset( &fc_limits, 0, sizeof( fc_limits ));
 694                         fc_limits.lms_s_unchecked = 1;
 695                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 696                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 697                 }
 698                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 699                         return LDAP_OTHER;
 700                 }
 701                 fop.ors_attrsonly = 1;
 702                 fop.ors_attrs = slap_anlist_no_attrs;
 703                 fop.ors_slimit = 1;
 704                 cb.sc_private = NULL;
 705                 cb.sc_response = findcsn_cb;
 706                 break;
 707         case FIND_PRESENT:
 708                 fop.ors_filter = op->ors_filter;
 709                 fop.ors_filterstr = op->ors_filterstr;
 710                 fop.ors_attrsonly = 0;
 711                 fop.ors_attrs = uuid_anlist;
 712                 fop.ors_slimit = SLAP_NO_LIMIT;
 713                 cb.sc_private = &pcookie;
 714                 cb.sc_response = findpres_cb;
 715                 pcookie.num = 0;
 716
 717                 /* preallocate storage for a full set */
 718                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 719                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 720                         op->o_tmpmemctx );
 721                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 722                 pcookie.uuids[0].bv_val = pcookie.last;
 723                 pcookie.uuids[0].bv_len = UUID_LEN;
 724                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 725                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 726                         pcookie.uuids[i].bv_len = UUID_LEN;
 727                 }
 728                 break;
 729         }
 730
 731         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 732         fop.o_bd->be_search( &fop, &frs );
 733         fop.o_bd->bd_info = (BackendInfo *)on;
 734
 735         switch( mode ) {
 736         case FIND_MAXCSN:
 737                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 738 #ifdef CHECK_CSN
 739                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 740                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 741 #endif
 742                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 743                         si->si_numops++;        /* ensure a checkpoint */
 744                 }
 745                 break;
 746         case FIND_CSN:
 747                 /* If matching CSN was not found, invalidate the context. */
 748                 if ( !cb.sc_private ) {
 749                         /* If we didn't find an exact match, then try for <= */
 750                         if ( findcsn_retry ) {
 751                                 findcsn_retry = 0;
 752                                 rs_reinit( &frs, REP_RESULT );
 753                                 goto again;
 754                         }
 755                         rc = LDAP_NO_SUCH_OBJECT;
 756                 }
 757                 break;
 758         case FIND_PRESENT:
 759                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 760                 break;
 761         }
 762
 763         return rc;
 764 }
 765
 766 /* Should find a place to cache these */
 767 static mutexint *get_mutexint()
 768 {
 769         mutexint *mi = ch_malloc( sizeof( mutexint ));
 770         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 771         mi->mi_int = 1;
 772         return mi;
 773 }
 774
 775 static void inc_mutexint( mutexint *mi )
 776 {
 777         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 778         mi->mi_int++;
 779         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 780 }
 781
 782 /* return resulting counter */
 783 static int dec_mutexint( mutexint *mi )
 784 {
 785         int i;
 786         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 787         i = --mi->mi_int;
 788         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 789         if ( !i ) {
 790                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 791                 ch_free( mi );
 792         }
 793         return i;
 794 }
 795
 796 static void
 797 syncprov_free_syncop( syncops *so )
 798 {
 799         syncres *sr, *srnext;
 800         GroupAssertion *ga, *gnext;
 801
 802         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 803         /* already being freed, or still in use */
 804         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 805                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 806                 return;
 807         }
 808         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 809         if ( so->s_flags & PS_IS_DETACHED ) {
 810                 filter_free( so->s_op->ors_filter );
 811                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 812                         gnext = ga->ga_next;
 813                         ch_free( ga );
 814                 }
 815                 ch_free( so->s_op );
 816         }
 817         ch_free( so->s_base.bv_val );
 818         for ( sr=so->s_res; sr; sr=srnext ) {
 819                 srnext = sr->s_next;
 820                 if ( sr->s_e ) {
 821                         if ( !dec_mutexint( sr->s_e->e_private )) {
 822                                 sr->s_e->e_private = NULL;
 823                                 entry_free( sr->s_e );
 824                         }
 825                 }
 826                 ch_free( sr );
 827         }
 828         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 829         ch_free( so );
 830 }
 831
 832 /* Send a persistent search response */
 833 static int
 834 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 835 {
 836         SlapReply rs = { REP_SEARCH };
 837         struct berval cookie, csns[2];
 838         Entry e_uuid = {0};
 839         Attribute a_uuid = {0};
 840
 841         if ( so->s_op->o_abandon )
 842                 return SLAPD_ABANDON;
 843
 844         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 845         rs.sr_ctrls[1] = NULL;
 846         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 847         csns[0] = opc->sctxcsn;
 848         BER_BVZERO( &csns[1] );
 849         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 850
 851 #ifdef LDAP_DEBUG
 852         if ( so->s_sid > 0 ) {
 853                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 854                         so->s_sid, cookie.bv_val, 0 );
 855         } else {
 856                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 857                         cookie.bv_val, 0, 0 );
 858         }
 859 #endif
 860
 861         e_uuid.e_attrs = &a_uuid;
 862         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 863         a_uuid.a_nvals = &opc->suuid;
 864         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 865                 mode, rs.sr_ctrls, 0, 1, &cookie );
 866         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 867
 868         rs.sr_entry = &e_uuid;
 869         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 870                 e_uuid = *opc->se;
 871                 e_uuid.e_private = NULL;
 872         }
 873
 874         switch( mode ) {
 875         case LDAP_SYNC_ADD:
 876                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 877                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 878                         rs.sr_err = send_search_reference( op, &rs );
 879                         ber_bvarray_free( rs.sr_ref );
 880                         break;
 881                 }
 882                 /* fallthru */
 883         case LDAP_SYNC_MODIFY:
 884                 rs.sr_attrs = op->ors_attrs;
 885                 rs.sr_err = send_search_entry( op, &rs );
 886                 break;
 887         case LDAP_SYNC_DELETE:
 888                 e_uuid.e_attrs = NULL;
 889                 e_uuid.e_name = opc->sdn;
 890                 e_uuid.e_nname = opc->sndn;
 891                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 892                         struct berval bv = BER_BVNULL;
 893                         rs.sr_ref = &bv;
 894                         rs.sr_err = send_search_reference( op, &rs );
 895                 } else {
 896                         rs.sr_err = send_search_entry( op, &rs );
 897                 }
 898                 break;
 899         default:
 900                 assert(0);
 901         }
 902         return rs.sr_err;
 903 }
 904
 905 static void
 906 syncprov_qstart( syncops *so );
 907
 908 /* Play back queued responses */
 909 static int
 910 syncprov_qplay( Operation *op, syncops *so )
 911 {
 912         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 913         syncres *sr;
 914         opcookie opc;
 915         int rc = 0;
 916
 917         opc.son = on;
 918
 919         do {
 920                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 921                 sr = so->s_res;
 922                 /* Exit loop with mutex held */
 923                 if ( !sr )
 924                         break;
 925                 so->s_res = sr->s_next;
 926                 if ( !so->s_res )
 927                         so->s_restail = NULL;
 928                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 929
 930                 if ( !so->s_op->o_abandon ) {
 931
 932                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 933                                 SlapReply rs = { REP_INTERMEDIATE };
 934
 935                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 936                                         &sr->s_csn, 0, NULL, 0 );
 937                         } else {
 938                                 opc.sdn = sr->s_dn;
 939                                 opc.sndn = sr->s_ndn;
 940                                 opc.suuid = sr->s_uuid;
 941                                 opc.sctxcsn = sr->s_csn;
 942                                 opc.sreference = sr->s_isreference;
 943                                 opc.se = sr->s_e;
 944
 945                                 rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 946                         }
 947                 }
 948
 949                 if ( sr->s_e ) {
 950                         if ( !dec_mutexint( sr->s_e->e_private )) {
 951                                 sr->s_e->e_private = NULL;
 952                                 entry_free ( sr->s_e );
 953                         }
 954                 }
 955                 ch_free( sr );
 956
 957                 if ( so->s_op->o_abandon )
 958                         continue;
 959
 960                 /* Exit loop with mutex held */
 961                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 962                 break;
 963
 964         } while (1);
 965
 966         /* We now only send one change at a time, to prevent one
 967          * psearch from hogging all the CPU. Resubmit this task if
 968          * there are more responses queued and no errors occurred.
 969          */
 970
 971         if ( rc == 0 && so->s_res ) {
 972                 syncprov_qstart( so );
 973         } else {
 974                 so->s_flags ^= PS_TASK_QUEUED;
 975         }
 976
 977         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 978         return rc;
 979 }
 980
 981 /* task for playing back queued responses */
 982 static void *
 983 syncprov_qtask( void *ctx, void *arg )
 984 {
 985         syncops *so = arg;
 986         OperationBuffer opbuf;
 987         Operation *op;
 988         BackendDB be;
 989         int rc;
 990
 991         op = &opbuf.ob_op;
 992         *op = *so->s_op;
 993         op->o_hdr = &opbuf.ob_hdr;
 994         op->o_controls = opbuf.ob_controls;
 995         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 996         op->o_sync = SLAP_CONTROL_IGNORED;
 997
 998         *op->o_hdr = *so->s_op->o_hdr;
 999
1000         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
1001         op->o_tmpmfuncs = &slap_sl_mfuncs;
1002         op->o_threadctx = ctx;
1003
1004         /* syncprov_qplay expects a fake db */
1005         be = *so->s_op->o_bd;
1006         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1007         op->o_bd = &be;
1008         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1009         op->o_callback = NULL;
1010
1011         rc = syncprov_qplay( op, so );
1012
1013         /* decrement use count... */
1014         syncprov_free_syncop( so );
1015
1016         return NULL;
1017 }
1018
1019 /* Start the task to play back queued psearch responses */
1020 static void
1021 syncprov_qstart( syncops *so )
1022 {
1023         so->s_flags |= PS_TASK_QUEUED;
1024         so->s_inuse++;
1025         ldap_pvt_thread_pool_submit( &connection_pool,
1026                 syncprov_qtask, so );
1027 }
1028
1029 /* Queue a persistent search response */
1030 static int
1031 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1032 {
1033         syncres *sr;
1034         int srsize;
1035         struct berval cookie = opc->sctxcsn;
1036
1037         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1038                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1039
1040                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1041                         so->s_rid, slap_serverID ? slap_serverID : -1);
1042         }
1043
1044         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1045                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1046         if ( cookie.bv_len )
1047                 srsize += cookie.bv_len + 1;
1048         sr = ch_malloc( srsize );
1049         sr->s_next = NULL;
1050         sr->s_e = opc->se;
1051         /* bump refcount on this entry */
1052         if ( opc->se )
1053                 inc_mutexint( opc->se->e_private );
1054         sr->s_dn.bv_val = (char *)(sr + 1);
1055         sr->s_dn.bv_len = opc->sdn.bv_len;
1056         sr->s_mode = mode;
1057         sr->s_isreference = opc->sreference;
1058         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1059                  opc->sdn.bv_val ) + 1;
1060         sr->s_ndn.bv_len = opc->sndn.bv_len;
1061         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1062                  opc->sndn.bv_val ) + 1;
1063         sr->s_uuid.bv_len = opc->suuid.bv_len;
1064         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1065         if ( cookie.bv_len ) {
1066                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1067                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1068         } else {
1069                 sr->s_csn.bv_val = NULL;
1070         }
1071         sr->s_csn.bv_len = cookie.bv_len;
1072
1073         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1074                 ch_free( cookie.bv_val );
1075         }
1076
1077         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1078         if ( !so->s_res ) {
1079                 so->s_res = sr;
1080         } else {
1081                 so->s_restail->s_next = sr;
1082         }
1083         so->s_restail = sr;
1084
1085         /* If the base of the psearch was modified, check it next time round */
1086         if ( so->s_flags & PS_WROTE_BASE ) {
1087                 so->s_flags ^= PS_WROTE_BASE;
1088                 so->s_flags |= PS_FIND_BASE;
1089         }
1090         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1091                 syncprov_qstart( so );
1092         }
1093         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1094         return LDAP_SUCCESS;
1095 }
1096
1097 static int
1098 syncprov_drop_psearch( syncops *so, int lock )
1099 {
1100         if ( so->s_flags & PS_IS_DETACHED ) {
1101                 if ( lock )
1102                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1103                 so->s_op->o_conn->c_n_ops_executing--;
1104                 so->s_op->o_conn->c_n_ops_completed++;
1105                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1106                         o_next );
1107                 if ( lock )
1108                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1109         }
1110         syncprov_free_syncop( so );
1111
1112         return 0;
1113 }
1114
1115 static int
1116 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1117 {
1118         slap_callback *sc = op->o_callback;
1119         op->o_callback = sc->sc_next;
1120         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1121         op->o_tmpfree( sc, op->o_tmpmemctx );
1122         return 0;
1123 }
1124
1125 static int
1126 syncprov_op_abandon( Operation *op, SlapReply *rs )
1127 {
1128         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1129         syncprov_info_t         *si = on->on_bi.bi_private;
1130         syncops *so, *soprev;
1131
1132         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1133         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1134                 soprev=so, so=so->s_next ) {
1135                 if ( so->s_op->o_connid == op->o_connid &&
1136                         so->s_op->o_msgid == op->orn_msgid ) {
1137                                 so->s_op->o_abandon = 1;
1138                                 soprev->s_next = so->s_next;
1139                                 break;
1140                 }
1141         }
1142         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1143         if ( so ) {
1144                 /* Is this really a Cancel exop? */
1145                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1146                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1147                         rs->sr_err = LDAP_CANCELLED;
1148                         send_ldap_result( so->s_op, rs );
1149                         if ( so->s_flags & PS_IS_DETACHED ) {
1150                                 slap_callback *cb;
1151                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1152                                 cb->sc_cleanup = syncprov_ab_cleanup;
1153                                 cb->sc_next = op->o_callback;
1154                                 cb->sc_private = so;
1155                                 op->o_callback = cb;
1156                                 return SLAP_CB_CONTINUE;
1157                         }
1158                 }
1159                 syncprov_drop_psearch( so, 0 );
1160         }
1161         return SLAP_CB_CONTINUE;
1162 }
1163
1164 /* Find which persistent searches are affected by this operation */
1165 static void
1166 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1167 {
1168         slap_overinst *on = opc->son;
1169         syncprov_info_t         *si = on->on_bi.bi_private;
1170
1171         fbase_cookie fc;
1172         syncops *ss, *sprev, *snext;
1173         Entry *e = NULL;
1174         Attribute *a;
1175         int rc;
1176         struct berval newdn;
1177         int freefdn = 0;
1178         BackendDB *b0 = op->o_bd, db;
1179
1180         fc.fdn = &op->o_req_ndn;
1181         /* compute new DN */
1182         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1183                 struct berval pdn;
1184                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1185                 else dnParent( fc.fdn, &pdn );
1186                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1187                 fc.fdn = &newdn;
1188                 freefdn = 1;
1189         }
1190         if ( op->o_tag != LDAP_REQ_ADD ) {
1191                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1192                         db = *op->o_bd;
1193                         op->o_bd = &db;
1194                 }
1195                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1196                 /* If we're sending responses now, make a copy and unlock the DB */
1197                 if ( e && !saveit ) {
1198                         if ( !opc->se ) {
1199                                 opc->se = entry_dup( e );
1200                                 opc->se->e_private = get_mutexint();
1201                         }
1202                         overlay_entry_release_ov( op, e, 0, on );
1203                         e = opc->se;
1204                 }
1205                 if ( rc ) {
1206                         op->o_bd = b0;
1207                         return;
1208                 }
1209         } else {
1210                 e = op->ora_e;
1211                 if ( !saveit ) {
1212                         if ( !opc->se ) {
1213                                 opc->se = entry_dup( e );
1214                                 opc->se->e_private = get_mutexint();
1215                         }
1216                         e = opc->se;
1217                 }
1218         }
1219
1220         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1221                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1222                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1223                 opc->sreference = is_entry_referral( e );
1224                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1225                 if ( a )
1226                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1227         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1228                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1229                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1230                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1231                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1232         }
1233
1234         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1235         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1236                 sprev = ss, ss=snext)
1237         {
1238                 Operation op2;
1239                 Opheader oh;
1240                 syncmatches *sm;
1241                 int found = 0;
1242
1243                 snext = ss->s_next;
1244                 if ( ss->s_op->o_abandon )
1245                         continue;
1246
1247                 /* Don't send ops back to the originator */
1248                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1249                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1250                                 opc->osid, 0, 0 );
1251                         continue;
1252                 }
1253
1254                 /* Don't send ops back to the messenger */
1255                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1256                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1257                                 opc->rsid, 0, 0 );
1258                         continue;
1259                 }
1260
1261                 /* validate base */
1262                 fc.fss = ss;
1263                 fc.fbase = 0;
1264                 fc.fscope = 0;
1265
1266                 /* If the base of the search is missing, signal a refresh */
1267                 rc = syncprov_findbase( op, &fc );
1268                 if ( rc != LDAP_SUCCESS ) {
1269                         SlapReply rs = {REP_RESULT};
1270                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1271                                 "search base has changed" );
1272                         sprev->s_next = snext;
1273                         syncprov_drop_psearch( ss, 1 );
1274                         ss = sprev;
1275                         continue;
1276                 }
1277
1278                 /* If we're sending results now, look for this op in old matches */
1279                 if ( !saveit ) {
1280                         syncmatches *old;
1281
1282                         /* Did we modify the search base? */
1283                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1284                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1285                                 ss->s_flags |= PS_WROTE_BASE;
1286                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1287                         }
1288
1289                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1290                                 old=sm, sm=sm->sm_next ) {
1291                                 if ( sm->sm_op == ss ) {
1292                                         found = 1;
1293                                         old->sm_next = sm->sm_next;
1294                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1295                                         break;
1296                                 }
1297                         }
1298                 }
1299
1300                 if ( fc.fscope ) {
1301                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1302                         op2 = *ss->s_op;
1303                         oh = *op->o_hdr;
1304                         oh.oh_conn = ss->s_op->o_conn;
1305                         oh.oh_connid = ss->s_op->o_connid;
1306                         op2.o_bd = op->o_bd->bd_self;
1307                         op2.o_hdr = &oh;
1308                         op2.o_extra = op->o_extra;
1309                         op2.o_callback = NULL;
1310                         if (ss->s_flags & PS_FIX_FILTER) {
1311                                 /* Skip the AND/GE clause that we stuck on in front. We
1312                                    would lose deletes/mods that happen during the refresh
1313                                    phase otherwise (ITS#6555) */
1314                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1315                         }
1316                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1317                         rc = test_filter( &op2, e, op2.ors_filter );
1318                 }
1319
1320                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1321                         ss->s_sid, fc.fscope, rc );
1322
1323                 /* check if current o_req_dn is in scope and matches filter */
1324                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1325                         if ( saveit ) {
1326                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1327                                 sm->sm_next = opc->smatches;
1328                                 sm->sm_op = ss;
1329                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1330                                 ++ss->s_inuse;
1331                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1332                                 opc->smatches = sm;
1333                         } else {
1334                                 /* if found send UPDATE else send ADD */
1335                                 syncprov_qresp( opc, ss,
1336                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1337                         }
1338                 } else if ( !saveit && found ) {
1339                         /* send DELETE */
1340                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1341                 } else if ( !saveit ) {
1342                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1343                 }
1344                 if ( !saveit && found ) {
1345                         /* Decrement s_inuse, was incremented when called
1346                          * with saveit == TRUE
1347                          */
1348                         syncprov_free_syncop( ss );
1349                 }
1350         }
1351         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1352
1353         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1354                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1355                         op->o_bd = &db;
1356                 }
1357                 if ( saveit )
1358                         overlay_entry_release_ov( op, e, 0, on );
1359                 op->o_bd = b0;
1360         }
1361         if ( opc->se && !saveit ) {
1362                 if ( !dec_mutexint( opc->se->e_private )) {
1363                         opc->se->e_private = NULL;
1364                         entry_free( opc->se );
1365                         opc->se = NULL;
1366                 }
1367         }
1368         if ( freefdn ) {
1369                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1370         }
1371         op->o_bd = b0;
1372 }
1373
1374 static int
1375 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1376 {
1377         slap_callback *cb = op->o_callback;
1378         opcookie *opc = cb->sc_private;
1379         slap_overinst *on = opc->son;
1380         syncprov_info_t         *si = on->on_bi.bi_private;
1381         syncmatches *sm, *snext;
1382         modtarget *mt;
1383
1384         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1385         if ( si->si_active )
1386                 si->si_active--;
1387         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1388
1389         for (sm = opc->smatches; sm; sm=snext) {
1390                 snext = sm->sm_next;
1391                 syncprov_free_syncop( sm->sm_op );
1392                 op->o_tmpfree( sm, op->o_tmpmemctx );
1393         }
1394
1395         /* Remove op from lock table */
1396         mt = opc->smt;
1397         if ( mt ) {
1398                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1399                 mt->mt_mods = mt->mt_mods->mi_next;
1400                 /* If there are more, promote the next one */
1401                 if ( mt->mt_mods ) {
1402                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1403                 } else {
1404                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1405                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1406                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1407                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1408                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1409                         ch_free( mt->mt_dn.bv_val );
1410                         ch_free( mt );
1411                 }
1412         }
1413         if ( !BER_BVISNULL( &opc->suuid ))
1414                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1415         if ( !BER_BVISNULL( &opc->sndn ))
1416                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1417         if ( !BER_BVISNULL( &opc->sdn ))
1418                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1419         op->o_callback = cb->sc_next;
1420         op->o_tmpfree(cb, op->o_tmpmemctx);
1421
1422         return 0;
1423 }
1424
1425 static void
1426 syncprov_checkpoint( Operation *op, slap_overinst *on )
1427 {
1428         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1429         Modifications mod;
1430         Operation opm;
1431         SlapReply rsm = {REP_RESULT};
1432         slap_callback cb = {0};
1433         BackendDB be;
1434         BackendInfo *bi;
1435
1436 #ifdef CHECK_CSN
1437         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1438
1439         int i;
1440         for ( i=0; i<si->si_numcsns; i++ ) {
1441                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1442         }
1443 #endif
1444         mod.sml_numvals = si->si_numcsns;
1445         mod.sml_values = si->si_ctxcsn;
1446         mod.sml_nvalues = NULL;
1447         mod.sml_desc = slap_schema.si_ad_contextCSN;
1448         mod.sml_op = LDAP_MOD_REPLACE;
1449         mod.sml_flags = SLAP_MOD_INTERNAL;
1450         mod.sml_next = NULL;
1451
1452         cb.sc_response = slap_null_cb;
1453         opm = *op;
1454         opm.o_tag = LDAP_REQ_MODIFY;
1455         opm.o_callback = &cb;
1456         opm.orm_modlist = &mod;
1457         opm.orm_no_opattrs = 1;
1458         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1459                 be = *on->on_info->oi_origdb;
1460                 opm.o_bd = &be;
1461         }
1462         opm.o_req_dn = si->si_contextdn;
1463         opm.o_req_ndn = si->si_contextdn;
1464         bi = opm.o_bd->bd_info;
1465         opm.o_bd->bd_info = on->on_info->oi_orig;
1466         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1467         opm.o_no_schema_check = 1;
1468         opm.o_bd->be_modify( &opm, &rsm );
1469
1470         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1471                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1472                 const char      *text;
1473                 char txtbuf[SLAP_TEXT_BUFLEN];
1474                 size_t textlen = sizeof txtbuf;
1475                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1476                 rs_reinit( &rsm, REP_RESULT );
1477                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1478                 opm.ora_e = e;
1479                 opm.o_bd->be_add( &opm, &rsm );
1480                 if ( e == opm.ora_e )
1481                         be_entry_release_w( &opm, opm.ora_e );
1482         }
1483         opm.o_bd->bd_info = bi;
1484
1485         if ( mod.sml_next != NULL ) {
1486                 slap_mods_free( mod.sml_next, 1 );
1487         }
1488 #ifdef CHECK_CSN
1489         for ( i=0; i<si->si_numcsns; i++ ) {
1490                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1491         }
1492 #endif
1493 }
1494
1495 static void
1496 syncprov_add_slog( Operation *op )
1497 {
1498         opcookie *opc = op->o_callback->sc_private;
1499         slap_overinst *on = opc->son;
1500         syncprov_info_t         *si = on->on_bi.bi_private;
1501         sessionlog *sl;
1502         slog_entry *se;
1503
1504         sl = si->si_logs;
1505         {
1506                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1507                         /* During the syncrepl refresh phase we can receive operations
1508                          * without a csn.  We cannot reliably determine the consumers
1509                          * state with respect to such operations, so we ignore them and
1510                          * wipe out anything in the log if we see them.
1511                          */
1512                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1513                         while ( se = sl->sl_head ) {
1514                                 sl->sl_head = se->se_next;
1515                                 ch_free( se );
1516                         }
1517                         sl->sl_tail = NULL;
1518                         sl->sl_num = 0;
1519                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1520                         return;
1521                 }
1522
1523                 /* Allocate a record. UUIDs are not NUL-terminated. */
1524                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1525                         op->o_csn.bv_len + 1 );
1526                 se->se_next = NULL;
1527                 se->se_tag = op->o_tag;
1528
1529                 se->se_uuid.bv_val = (char *)(&se[1]);
1530                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1531                 se->se_uuid.bv_len = opc->suuid.bv_len;
1532
1533                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1534                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1535                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1536                 se->se_csn.bv_len = op->o_csn.bv_len;
1537                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1538
1539                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1540                 if ( sl->sl_head ) {
1541                         /* Keep the list in csn order. */
1542                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1543                                 sl->sl_tail->se_next = se;
1544                                 sl->sl_tail = se;
1545                         } else {
1546                                 slog_entry **sep;
1547
1548                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1549                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1550                                                 se->se_next = *sep;
1551                                                 *sep = se;
1552                                                 break;
1553                                         }
1554                                 }
1555                         }
1556                 } else {
1557                         sl->sl_head = se;
1558                         sl->sl_tail = se;
1559                         if ( !sl->sl_mincsn ) {
1560                                 sl->sl_numcsns = 1;
1561                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1562                                 sl->sl_sids = ch_malloc( sizeof( int ));
1563                                 sl->sl_sids[0] = se->se_sid;
1564                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1565                                 BER_BVZERO( &sl->sl_mincsn[1] );
1566                         }
1567                 }
1568                 sl->sl_num++;
1569                 while ( sl->sl_num > sl->sl_size ) {
1570                         int i, j;
1571                         se = sl->sl_head;
1572                         sl->sl_head = se->se_next;
1573                         for ( i=0; i<sl->sl_numcsns; i++ )
1574                                 if ( sl->sl_sids[i] >= se->se_sid )
1575                                         break;
1576                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1577                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1578                                         i, se->se_sid, &se->se_csn );
1579                         } else {
1580                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1581                         }
1582                         ch_free( se );
1583                         sl->sl_num--;
1584                 }
1585                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1586         }
1587 }
1588
1589 /* Just set a flag if we found the matching entry */
1590 static int
1591 playlog_cb( Operation *op, SlapReply *rs )
1592 {
1593         if ( rs->sr_type == REP_SEARCH ) {
1594                 op->o_callback->sc_private = (void *)1;
1595         }
1596         return rs->sr_err;
1597 }
1598
1599 /* enter with sl->sl_mutex locked, release before returning */
1600 static void
1601 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1602         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1603 {
1604         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1605         slog_entry *se;
1606         int i, j, ndel, num, nmods, mmods;
1607         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1608         BerVarray uuids;
1609         struct berval delcsn[2];
1610
1611         if ( !sl->sl_num ) {
1612                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1613                 return;
1614         }
1615
1616         num = sl->sl_num;
1617         i = 0;
1618         nmods = 0;
1619
1620         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1621                 num * UUID_LEN, op->o_tmpmemctx );
1622         uuids[0].bv_val = (char *)(uuids + num + 1);
1623
1624         delcsn[0].bv_len = 0;
1625         delcsn[0].bv_val = cbuf;
1626         BER_BVZERO(&delcsn[1]);
1627
1628         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1629          * and everything else at the end. Do this first so we can
1630          * unlock the list mutex.
1631          */
1632         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1633                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1634         for ( se=sl->sl_head; se; se=se->se_next ) {
1635                 int k;
1636                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1637                 ndel = 1;
1638                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1639                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1640                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1641                                 break;
1642                         }
1643                 }
1644                 if ( ndel <= 0 ) {
1645                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1646                         continue;
1647                 }
1648                 ndel = 0;
1649                 for ( k=0; k<numcsns; k++ ) {
1650                         if ( se->se_sid == sids[k] ) {
1651                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1652                                 break;
1653                         }
1654                 }
1655                 if ( ndel > 0 ) {
1656                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1657                         break;
1658                 }
1659                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1660                         j = i;
1661                         i++;
1662                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1663                         delcsn[0].bv_len = se->se_csn.bv_len;
1664                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1665                 } else {
1666                         if ( se->se_tag == LDAP_REQ_ADD )
1667                                 continue;
1668                         nmods++;
1669                         j = num - nmods;
1670                 }
1671                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1672                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1673                 uuids[j].bv_len = UUID_LEN;
1674         }
1675         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1676
1677         ndel = i;
1678
1679         /* Zero out unused slots */
1680         for ( i=ndel; i < num - nmods; i++ )
1681                 uuids[i].bv_len = 0;
1682
1683         /* Mods must be validated to see if they belong in this delete set.
1684          */
1685
1686         mmods = nmods;
1687         /* Strip any duplicates */
1688         for ( i=0; i<nmods; i++ ) {
1689                 for ( j=0; j<ndel; j++ ) {
1690                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1691                                 uuids[num - 1 - i].bv_len = 0;
1692                                 mmods --;
1693                                 break;
1694                         }
1695                 }
1696                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1697                 for ( j=0; j<i; j++ ) {
1698                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1699                                 uuids[num - 1 - i].bv_len = 0;
1700                                 mmods --;
1701                                 break;
1702                         }
1703                 }
1704         }
1705
1706         if ( mmods ) {
1707                 Operation fop;
1708                 int rc;
1709                 Filter mf, af;
1710                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1711                 slap_callback cb = {0};
1712
1713                 fop = *op;
1714
1715                 fop.o_sync_mode = 0;
1716                 fop.o_callback = &cb;
1717                 fop.ors_limit = NULL;
1718                 fop.ors_tlimit = SLAP_NO_LIMIT;
1719                 fop.ors_attrs = slap_anlist_all_attributes;
1720                 fop.ors_attrsonly = 0;
1721                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1722
1723                 af.f_choice = LDAP_FILTER_AND;
1724                 af.f_next = NULL;
1725                 af.f_and = &mf;
1726                 mf.f_choice = LDAP_FILTER_EQUALITY;
1727                 mf.f_ava = &eq;
1728                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1729                 mf.f_next = fop.ors_filter;
1730
1731                 fop.ors_filter = &af;
1732
1733                 cb.sc_response = playlog_cb;
1734                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1735
1736                 for ( i=ndel; i<num; i++ ) {
1737                   if ( uuids[i].bv_len != 0 ) {
1738                         SlapReply frs = { REP_RESULT };
1739
1740                         mf.f_av_value = uuids[i];
1741                         cb.sc_private = NULL;
1742                         fop.ors_slimit = 1;
1743                         rc = fop.o_bd->be_search( &fop, &frs );
1744
1745                         /* If entry was not found, add to delete list */
1746                         if ( !cb.sc_private ) {
1747                                 uuids[ndel++] = uuids[i];
1748                         }
1749                   }
1750                 }
1751                 fop.o_bd->bd_info = (BackendInfo *)on;
1752         }
1753         if ( ndel ) {
1754                 struct berval cookie;
1755
1756                 if ( delcsn[0].bv_len ) {
1757                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1758                                 slap_serverID ? slap_serverID : -1 );
1759
1760                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1761                 }
1762
1763                 uuids[ndel].bv_val = NULL;
1764                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1765                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1766                 if ( delcsn[0].bv_len ) {
1767                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1768                 }
1769         }
1770         op->o_tmpfree( uuids, op->o_tmpmemctx );
1771 }
1772
1773 static int
1774 syncprov_op_response( Operation *op, SlapReply *rs )
1775 {
1776         opcookie *opc = op->o_callback->sc_private;
1777         slap_overinst *on = opc->son;
1778         syncprov_info_t         *si = on->on_bi.bi_private;
1779         syncmatches *sm;
1780
1781         if ( rs->sr_err == LDAP_SUCCESS )
1782         {
1783                 struct berval maxcsn;
1784                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1785                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1786
1787                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1788
1789                 /* Update our context CSN */
1790                 cbuf[0] = '\0';
1791                 maxcsn.bv_val = cbuf;
1792                 maxcsn.bv_len = sizeof(cbuf);
1793                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1794
1795                 slap_get_commit_csn( op, &maxcsn, &foundit );
1796                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1797                         /* syncrepl queues the CSN values in the db where
1798                          * it is configured , not where the changes are made.
1799                          * So look for a value in the glue db if we didn't
1800                          * find any in this db.
1801                          */
1802                         BackendDB *be = op->o_bd;
1803                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1804                         maxcsn.bv_val = cbuf;
1805                         maxcsn.bv_len = sizeof(cbuf);
1806                         slap_get_commit_csn( op, &maxcsn, &foundit );
1807                         op->o_bd = be;
1808                 }
1809                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1810                         int i, sid;
1811 #ifdef CHECK_CSN
1812                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1813                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1814 #endif
1815                         sid = slap_parse_csn_sid( &maxcsn );
1816                         for ( i=0; i<si->si_numcsns; i++ ) {
1817                                 if ( sid < si->si_sids[i] )
1818                                         break;
1819                                 if ( sid == si->si_sids[i] ) {
1820                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1821                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1822                                                 csn_changed = 1;
1823                                         }
1824                                         break;
1825                                 }
1826                         }
1827                         /* It's a new SID for us */
1828                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1829                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1830                                         i, sid, &maxcsn );
1831                                 csn_changed = 1;
1832                         }
1833                 }
1834
1835                 /* Don't do any processing for consumer contextCSN updates */
1836                 if ( op->o_dont_replicate ) {
1837                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1838                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1839                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1840                         /* Catch contextCSN updates from syncrepl. We have to look at
1841                          * all the attribute values, as there may be more than one csn
1842                          * that changed, and only one can be passed in the csn queue.
1843                          */
1844                         Modifications *mod = op->orm_modlist;
1845                         unsigned i;
1846                         int j, sid;
1847
1848                         for ( i=0; i<mod->sml_numvals; i++ ) {
1849                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1850                                 for ( j=0; j<si->si_numcsns; j++ ) {
1851                                         if ( sid < si->si_sids[j] )
1852                                                 break;
1853                                         if ( sid == si->si_sids[j] ) {
1854                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1855                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1856                                                         csn_changed = 1;
1857                                                 }
1858                                                 break;
1859                                         }
1860                                 }
1861
1862                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1863                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1864                                                 j, sid, &mod->sml_values[i] );
1865                                         csn_changed = 1;
1866                                 }
1867                         }
1868                         if ( csn_changed )
1869                                 si->si_dirty = 0;
1870                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1871
1872                         if ( csn_changed ) {
1873                                 syncops *ss;
1874                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1875                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1876                                         if ( ss->s_op->o_abandon )
1877                                                 continue;
1878                                         /* Send the updated csn to all syncrepl consumers,
1879                                          * including the server from which it originated.
1880                                          * The syncrepl consumer and syncprov provider on
1881                                          * the originating server may be configured to store
1882                                          * their csn values in different entries.
1883                                          */
1884                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1885                                 }
1886                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1887                         }
1888                         } else {
1889                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1890                         }
1891                         goto leave;
1892                 }
1893
1894                 si->si_numops++;
1895                 if ( si->si_chkops || si->si_chktime ) {
1896                         /* Never checkpoint adding the context entry,
1897                          * it will deadlock
1898                          */
1899                         if ( op->o_tag != LDAP_REQ_ADD ||
1900                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1901                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1902                                         do_check = 1;
1903                                         si->si_numops = 0;
1904                                 }
1905                                 if ( si->si_chktime &&
1906                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1907                                         if ( si->si_chklast ) {
1908                                                 do_check = 1;
1909                                                 si->si_chklast = op->o_time;
1910                                         } else {
1911                                                 si->si_chklast = 1;
1912                                         }
1913                                 }
1914                         }
1915                 }
1916                 si->si_dirty = !csn_changed;
1917                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1918
1919                 if ( do_check ) {
1920                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1921                         syncprov_checkpoint( op, on );
1922                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1923                 }
1924
1925                 /* only update consumer ctx if this is a newer csn */
1926                 if ( csn_changed ) {
1927                         opc->sctxcsn = maxcsn;
1928                 }
1929
1930                 /* Handle any persistent searches */
1931                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1932                 have_psearches = ( si->si_ops != NULL );
1933                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1934                 if ( have_psearches ) {
1935                         switch(op->o_tag) {
1936                         case LDAP_REQ_ADD:
1937                         case LDAP_REQ_MODIFY:
1938                         case LDAP_REQ_MODRDN:
1939                         case LDAP_REQ_EXTENDED:
1940                                 syncprov_matchops( op, opc, 0 );
1941                                 break;
1942                         case LDAP_REQ_DELETE:
1943                                 /* for each match in opc->smatches:
1944                                  *   send DELETE msg
1945                                  */
1946                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1947                                         if ( sm->sm_op->s_op->o_abandon )
1948                                                 continue;
1949                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1950                                 }
1951                                 break;
1952                         }
1953                 }
1954
1955                 /* Add any log records */
1956                 if ( si->si_logs ) {
1957                         syncprov_add_slog( op );
1958                 }
1959 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1960         }
1961         return SLAP_CB_CONTINUE;
1962 }
1963
1964 /* We don't use a subentry to store the context CSN any more.
1965  * We expose the current context CSN as an operational attribute
1966  * of the suffix entry.
1967  */
1968 static int
1969 syncprov_op_compare( Operation *op, SlapReply *rs )
1970 {
1971         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1972         syncprov_info_t         *si = on->on_bi.bi_private;
1973         int rc = SLAP_CB_CONTINUE;
1974
1975         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1976                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1977         {
1978                 Entry e = {0};
1979                 Attribute a = {0};
1980
1981                 e.e_name = si->si_contextdn;
1982                 e.e_nname = si->si_contextdn;
1983                 e.e_attrs = &a;
1984
1985                 a.a_desc = slap_schema.si_ad_contextCSN;
1986
1987                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1988
1989                 a.a_vals = si->si_ctxcsn;
1990                 a.a_nvals = a.a_vals;
1991                 a.a_numvals = si->si_numcsns;
1992
1993                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1994                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1995                 if ( ! rs->sr_err ) {
1996                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1997                         goto return_results;
1998                 }
1999
2000                 if ( get_assert( op ) &&
2001                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2002                 {
2003                         rs->sr_err = LDAP_ASSERTION_FAILED;
2004                         goto return_results;
2005                 }
2006
2007
2008                 rs->sr_err = LDAP_COMPARE_FALSE;
2009
2010                 if ( attr_valfind( &a,
2011                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2012                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2013                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2014                 {
2015                         rs->sr_err = LDAP_COMPARE_TRUE;
2016                 }
2017
2018 return_results:;
2019
2020                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2021
2022                 send_ldap_result( op, rs );
2023
2024                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2025                         rs->sr_err = LDAP_SUCCESS;
2026                 }
2027                 rc = rs->sr_err;
2028         }
2029
2030         return rc;
2031 }
2032
2033 static int
2034 syncprov_op_mod( Operation *op, SlapReply *rs )
2035 {
2036         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2037         syncprov_info_t         *si = on->on_bi.bi_private;
2038         slap_callback *cb;
2039         opcookie *opc;
2040         int have_psearches, cbsize;
2041
2042         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2043         have_psearches = ( si->si_ops != NULL );
2044         si->si_active++;
2045         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2046
2047         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2048                 (have_psearches ? sizeof(modinst) : 0 );
2049
2050         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2051         opc = (opcookie *)(cb+1);
2052         opc->son = on;
2053         cb->sc_response = syncprov_op_response;
2054         cb->sc_cleanup = syncprov_op_cleanup;
2055         cb->sc_private = opc;
2056         cb->sc_next = op->o_callback;
2057         op->o_callback = cb;
2058
2059         opc->osid = -1;
2060         opc->rsid = -1;
2061         if ( op->o_csn.bv_val ) {
2062                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2063         }
2064         if ( op->o_controls ) {
2065                 struct sync_cookie *scook =
2066                 op->o_controls[slap_cids.sc_LDAPsync];
2067                 if ( scook )
2068                         opc->rsid = scook->sid;
2069         }
2070
2071         if ( op->o_dont_replicate )
2072                 return SLAP_CB_CONTINUE;
2073
2074         /* If there are active persistent searches, lock this operation.
2075          * See seqmod.c for the locking logic on its own.
2076          */
2077         if ( have_psearches ) {
2078                 modtarget *mt, mtdummy;
2079                 modinst *mi;
2080
2081                 mi = (modinst *)(opc+1);
2082                 mi->mi_op = op;
2083
2084                 /* See if we're already modifying this entry... */
2085                 mtdummy.mt_dn = op->o_req_ndn;
2086                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2087                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2088                 if ( mt ) {
2089                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2090                         if ( mt->mt_mods == NULL ) {
2091                                 /* Cannot reuse this mt, as another thread is about
2092                                  * to release it in syncprov_op_cleanup.
2093                                  */
2094                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2095                                 mt = NULL;
2096                         }
2097                 }
2098                 if ( mt ) {
2099                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2100                         mt->mt_tail->mi_next = mi;
2101                         mt->mt_tail = mi;
2102                         /* wait for this op to get to head of list */
2103                         while ( mt->mt_mods != mi ) {
2104                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2105                                 /* FIXME: if dynamic config can delete overlays or
2106                                  * databases we'll have to check for cleanup here.
2107                                  * Currently it's not an issue because there are
2108                                  * no dynamic config deletes...
2109                                  */
2110                                 if ( slapd_shutdown )
2111                                         return SLAPD_ABANDON;
2112
2113                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2114                                         ldap_pvt_thread_yield();
2115                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2116
2117                                 /* clean up if the caller is giving up */
2118                                 if ( op->o_abandon ) {
2119                                         modinst *m2;
2120                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2121                                                 m2 = m2->mi_next );
2122                                         if ( m2 ) {
2123                                                 m2->mi_next = mi->mi_next;
2124                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2125                                         }
2126                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2127                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2128                                         return SLAPD_ABANDON;
2129                                 }
2130                         }
2131                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2132                 } else {
2133                         /* Record that we're modifying this entry now */
2134                         mt = ch_malloc( sizeof(modtarget) );
2135                         mt->mt_mods = mi;
2136                         mt->mt_tail = mi;
2137                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2138                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2139                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2140                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2141                 }
2142                 opc->smt = mt;
2143         }
2144
2145         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2146                 syncprov_matchops( op, opc, 1 );
2147
2148         return SLAP_CB_CONTINUE;
2149 }
2150
2151 static int
2152 syncprov_op_extended( Operation *op, SlapReply *rs )
2153 {
2154         if ( exop_is_write( op ))
2155                 return syncprov_op_mod( op, rs );
2156
2157         return SLAP_CB_CONTINUE;
2158 }
2159
2160 typedef struct searchstate {
2161         slap_overinst *ss_on;
2162         syncops *ss_so;
2163         BerVarray ss_ctxcsn;
2164         int *ss_sids;
2165         int ss_numcsns;
2166 #define SS_PRESENT      0x01
2167 #define SS_CHANGED      0x02
2168         int ss_flags;
2169 } searchstate;
2170
2171 typedef struct SyncOperationBuffer {
2172         Operation               sob_op;
2173         Opheader                sob_hdr;
2174         OpExtra                 sob_oe;
2175         AttributeName   sob_extra;      /* not always present */
2176         /* Further data allocated here */
2177 } SyncOperationBuffer;
2178
2179 static void
2180 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2181 {
2182         SyncOperationBuffer *sopbuf2;
2183         Operation *op2;
2184         int i, alen = 0;
2185         size_t size;
2186         char *ptr;
2187         GroupAssertion *g1, *g2;
2188
2189         /* count the search attrs */
2190         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2191                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2192         }
2193         /* Make a new copy of the operation */
2194         size = offsetof( SyncOperationBuffer, sob_extra ) +
2195                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2196                 op->o_req_dn.bv_len + 1 +
2197                 op->o_req_ndn.bv_len + 1 +
2198                 op->o_ndn.bv_len + 1 +
2199                 so->s_filterstr.bv_len + 1;
2200         sopbuf2 = ch_calloc( 1, size );
2201         op2 = &sopbuf2->sob_op;
2202         op2->o_hdr = &sopbuf2->sob_hdr;
2203         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2204
2205         /* Copy the fields we care about explicitly, leave the rest alone */
2206         *op2->o_hdr = *op->o_hdr;
2207         op2->o_tag = op->o_tag;
2208         op2->o_time = op->o_time;
2209         op2->o_bd = on->on_info->oi_origdb;
2210         op2->o_request = op->o_request;
2211         op2->o_managedsait = op->o_managedsait;
2212         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2213         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2214
2215         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2216         if ( i ) {
2217                 op2->ors_attrs = (AttributeName *) ptr;
2218                 ptr = (char *) &op2->ors_attrs[i+1];
2219                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2220                         op2->ors_attrs[i] = op->ors_attrs[i];
2221                         op2->ors_attrs[i].an_name.bv_val = ptr;
2222                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2223                 }
2224                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2225         }
2226
2227         op2->o_authz = op->o_authz;
2228         op2->o_ndn.bv_val = ptr;
2229         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2230         op2->o_dn = op2->o_ndn;
2231         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2232         op2->o_req_dn.bv_val = ptr;
2233         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2234         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2235         op2->o_req_ndn.bv_val = ptr;
2236         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2237         op2->ors_filterstr.bv_val = ptr;
2238         strcpy( ptr, so->s_filterstr.bv_val );
2239         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2240
2241         /* Skip the AND/GE clause that we stuck on in front */
2242         if ( so->s_flags & PS_FIX_FILTER ) {
2243                 op2->ors_filter = op->ors_filter->f_and->f_next;
2244                 so->s_flags ^= PS_FIX_FILTER;
2245         } else {
2246                 op2->ors_filter = op->ors_filter;
2247         }
2248         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2249         so->s_op = op2;
2250
2251         /* Copy any cached group ACLs individually */
2252         op2->o_groups = NULL;
2253         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2254                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2255                 *g2 = *g1;
2256                 strcpy( g2->ga_ndn, g1->ga_ndn );
2257                 g2->ga_next = op2->o_groups;
2258                 op2->o_groups = g2;
2259         }
2260         /* Don't allow any further group caching */
2261         op2->o_do_not_cache = 1;
2262
2263         /* Add op2 to conn so abandon will find us */
2264         op->o_conn->c_n_ops_executing++;
2265         op->o_conn->c_n_ops_completed--;
2266         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2267         so->s_flags |= PS_IS_DETACHED;
2268
2269         /* Prevent anyone else from trying to send a result for this op */
2270         op->o_abandon = 1;
2271 }
2272
2273 static int
2274 syncprov_search_response( Operation *op, SlapReply *rs )
2275 {
2276         searchstate *ss = op->o_callback->sc_private;
2277         slap_overinst *on = ss->ss_on;
2278         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2279         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2280
2281         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2282                 Attribute *a;
2283                 /* If we got a referral without a referral object, there's
2284                  * something missing that we cannot replicate. Just ignore it.
2285                  * The consumer will abort because we didn't send the expected
2286                  * control.
2287                  */
2288                 if ( !rs->sr_entry ) {
2289                         assert( rs->sr_entry != NULL );
2290                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2291                         return SLAP_CB_CONTINUE;
2292                 }
2293                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2294                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2295                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2296                 }
2297                 if ( a ) {
2298                         int i, sid;
2299                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2300
2301                         /* Don't send changed entries back to the originator */
2302                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2303                                 Debug( LDAP_DEBUG_SYNC,
2304                                         "Entry %s changed by peer, ignored\n",
2305                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2306                                 return LDAP_SUCCESS;
2307                         }
2308
2309                         /* If not a persistent search */
2310                         if ( !ss->ss_so ) {
2311                                 /* Make sure entry is less than the snapshot'd contextCSN */
2312                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2313                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2314                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2315                                                 Debug( LDAP_DEBUG_SYNC,
2316                                                         "Entry %s CSN %s greater than snapshot %s\n",
2317                                                         rs->sr_entry->e_name.bv_val,
2318                                                         a->a_nvals[0].bv_val,
2319                                                         ss->ss_ctxcsn[i].bv_val );
2320                                                 return LDAP_SUCCESS;
2321                                         }
2322                                 }
2323                         }
2324
2325                         /* Don't send old entries twice */
2326                         if ( srs->sr_state.ctxcsn ) {
2327                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2328                                         if ( sid == srs->sr_state.sids[i] &&
2329                                                 ber_bvcmp( &a->a_nvals[0],
2330                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2331                                                 Debug( LDAP_DEBUG_SYNC,
2332                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2333                                                         rs->sr_entry->e_name.bv_val,
2334                                                         a->a_nvals[0].bv_val,
2335                                                         srs->sr_state.ctxcsn[i].bv_val );
2336                                                 return LDAP_SUCCESS;
2337                                         }
2338                                 }
2339                         }
2340                 }
2341                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2342                         op->o_tmpmemctx );
2343                 rs->sr_ctrls[1] = NULL;
2344                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2345                 /* If we're in delta-sync mode, always send a cookie */
2346                 if ( si->si_nopres && si->si_usehint && a ) {
2347                         struct berval cookie;
2348                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2349                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2350                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2351                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2352                 } else {
2353                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2354                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2355                 }
2356         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2357                 struct berval cookie = BER_BVNULL;
2358
2359                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2360                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2361                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2362                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2363
2364                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2365                 }
2366
2367                 /* Is this a regular refresh?
2368                  * Note: refresh never gets here if there were no changes
2369                  */
2370                 if ( !ss->ss_so ) {
2371                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2372                                 op->o_tmpmemctx );
2373                         rs->sr_ctrls[1] = NULL;
2374                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2375                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2376                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2377                                         LDAP_SYNC_REFRESH_DELETES );
2378                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2379                 } else {
2380                 /* It's RefreshAndPersist, transition to Persist phase */
2381                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2382                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2383                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2384                                 1, NULL, 0 );
2385                         if ( !BER_BVISNULL( &cookie ))
2386                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2387
2388                         /* Detach this Op from frontend control */
2389                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2390
2391                         /* But not if this connection was closed along the way */
2392                         if ( op->o_abandon ) {
2393                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2394                                 /* syncprov_ab_cleanup will free this syncop */
2395                                 return SLAPD_ABANDON;
2396
2397                         } else {
2398                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2399                                 /* Turn off the refreshing flag */
2400                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2401
2402                                 syncprov_detach_op( op, ss->ss_so, on );
2403
2404                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2405
2406                                 /* If there are queued responses, fire them off */
2407                                 if ( ss->ss_so->s_res )
2408                                         syncprov_qstart( ss->ss_so );
2409                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2410                         }
2411
2412                         return LDAP_SUCCESS;
2413                 }
2414         }
2415
2416         return SLAP_CB_CONTINUE;
2417 }
2418
2419 static int
2420 syncprov_op_search( Operation *op, SlapReply *rs )
2421 {
2422         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2423         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2424         slap_callback   *cb;
2425         int gotstate = 0, changed = 0, do_present = 0;
2426         syncops *sop = NULL;
2427         searchstate *ss;
2428         sync_control *srs;
2429         BerVarray ctxcsn;
2430         int i, *sids, numcsns;
2431         struct berval mincsn, maxcsn;
2432         int minsid, maxsid;
2433         int dirty = 0;
2434
2435         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2436
2437         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2438                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2439                 return rs->sr_err;
2440         }
2441
2442         srs = op->o_controls[slap_cids.sc_LDAPsync];
2443
2444         /* If this is a persistent search, set it up right away */
2445         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2446                 syncops so = {0};
2447                 fbase_cookie fc;
2448                 opcookie opc;
2449                 slap_callback sc;
2450
2451                 fc.fss = &so;
2452                 fc.fbase = 0;
2453                 so.s_eid = NOID;
2454                 so.s_op = op;
2455                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2456                 /* syncprov_findbase expects to be called as a callback... */
2457                 sc.sc_private = &opc;
2458                 opc.son = on;
2459                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2460                 cb = op->o_callback;
2461                 op->o_callback = &sc;
2462                 rs->sr_err = syncprov_findbase( op, &fc );
2463                 op->o_callback = cb;
2464                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2465
2466                 if ( rs->sr_err != LDAP_SUCCESS ) {
2467                         send_ldap_result( op, rs );
2468                         return rs->sr_err;
2469                 }
2470                 sop = ch_malloc( sizeof( syncops ));
2471                 *sop = so;
2472                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2473                 sop->s_rid = srs->sr_state.rid;
2474                 sop->s_sid = srs->sr_state.sid;
2475                 /* set refcount=2 to prevent being freed out from under us
2476                  * by abandons that occur while we're running here
2477                  */
2478                 sop->s_inuse = 2;
2479
2480                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2481                 while ( si->si_active ) {
2482                         /* Wait for active mods to finish before proceeding, as they
2483                          * may already have inspected the si_ops list looking for
2484                          * consumers to replicate the change to.  Using the log
2485                          * doesn't help, as we may finish playing it before the
2486                          * active mods gets added to it.
2487                          */
2488                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2489                         if ( slapd_shutdown ) {
2490                                 ch_free( sop );
2491                                 return SLAPD_ABANDON;
2492                         }
2493                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2494                                 ldap_pvt_thread_yield();
2495                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2496                 }
2497                 sop->s_next = si->si_ops;
2498                 si->si_ops = sop;
2499                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2500         }
2501
2502         /* snapshot the ctxcsn */
2503         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2504         numcsns = si->si_numcsns;
2505         if ( numcsns ) {
2506                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2507                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2508                 for ( i=0; i<numcsns; i++ )
2509                         sids[i] = si->si_sids[i];
2510         } else {
2511                 ctxcsn = NULL;
2512                 sids = NULL;
2513         }
2514         dirty = si->si_dirty;
2515         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2516
2517         /* If we have a cookie, handle the PRESENT lookups */
2518         if ( srs->sr_state.ctxcsn ) {
2519                 sessionlog *sl;
2520                 int i, j;
2521
2522                 /* If we don't have any CSN of our own yet, pretend nothing
2523                  * has changed.
2524                  */
2525                 if ( !numcsns )
2526                         goto no_change;
2527
2528                 if ( !si->si_nopres )
2529                         do_present = SS_PRESENT;
2530
2531                 /* If there are SIDs we don't recognize in the cookie, drop them */
2532                 for (i=0; i<srs->sr_state.numcsns; ) {
2533                         for (j=i; j<numcsns; j++) {
2534                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2535                                         break;
2536                                 }
2537                         }
2538                         /* not found */
2539                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2540                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2541                                 srs->sr_state.numcsns--;
2542                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2543                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2544                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2545                                 }
2546                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2547                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2548                                 continue;
2549                         }
2550                         i++;
2551                 }
2552
2553                 if (srs->sr_state.numcsns != numcsns) {
2554                         /* consumer doesn't have the right number of CSNs */
2555                         changed = SS_CHANGED;
2556                         if ( srs->sr_state.ctxcsn ) {
2557                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2558                                 srs->sr_state.ctxcsn = NULL;
2559                         }
2560                         if ( srs->sr_state.sids ) {
2561                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2562                                 srs->sr_state.sids = NULL;
2563                         }
2564                         srs->sr_state.numcsns = 0;
2565                         goto shortcut;
2566                 }
2567
2568                 /* Find the smallest CSN which differs from contextCSN */
2569                 mincsn.bv_len = 0;
2570                 maxcsn.bv_len = 0;
2571                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2572                         int newer;
2573                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2574                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2575                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2576                                 maxcsn = srs->sr_state.ctxcsn[i];
2577                                 maxsid = sids[j];
2578                         }
2579                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2580                         /* If our state is newer, tell consumer about changes */
2581                         if ( newer < 0) {
2582                                 changed = SS_CHANGED;
2583                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2584                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2585                                         mincsn = srs->sr_state.ctxcsn[i];
2586                                         minsid = sids[j];
2587                                 }
2588                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2589                         /* our state is older, complain to consumer */
2590                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2591                                 rs->sr_text = "consumer state is newer than provider!";
2592 bailout:
2593                                 if ( sop ) {
2594                                         syncops **sp = &si->si_ops;
2595
2596                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2597                                         while ( *sp != sop )
2598                                                 sp = &(*sp)->s_next;
2599                                         *sp = sop->s_next;
2600                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2601                                         ch_free( sop );
2602                                 }
2603                                 rs->sr_ctrls = NULL;
2604                                 send_ldap_result( op, rs );
2605                                 return rs->sr_err;
2606                         }
2607                 }
2608                 if ( BER_BVISEMPTY( &mincsn )) {
2609                         mincsn = maxcsn;
2610                         minsid = maxsid;
2611                 }
2612
2613                 /* If nothing has changed, shortcut it */
2614                 if ( !changed && !dirty ) {
2615                         do_present = 0;
2616 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2617                                 LDAPControl     *ctrls[2];
2618
2619                                 ctrls[0] = NULL;
2620                                 ctrls[1] = NULL;
2621                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2622                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2623                                 rs->sr_ctrls = ctrls;
2624                                 rs->sr_err = LDAP_SUCCESS;
2625                                 send_ldap_result( op, rs );
2626                                 rs->sr_ctrls = NULL;
2627                                 return rs->sr_err;
2628                         }
2629                         goto shortcut;
2630                 }
2631
2632                 /* Do we have a sessionlog for this search? */
2633                 sl=si->si_logs;
2634                 if ( sl ) {
2635                         int do_play = 0;
2636                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2637                         /* Are there any log entries, and is the consumer state
2638                          * present in the session log?
2639                          */
2640                         if ( sl->sl_num > 0 ) {
2641                                 int i;
2642                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2643                                         /* SID not present == new enough */
2644                                         if ( minsid < sl->sl_sids[i] ) {
2645                                                 do_play = 1;
2646                                                 break;
2647                                         }
2648                                         /* SID present */
2649                                         if ( minsid == sl->sl_sids[i] ) {
2650                                                 /* new enough? */
2651                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2652                                                         do_play = 1;
2653                                                 break;
2654                                         }
2655                                 }
2656                                 /* SID not present == new enough */
2657                                 if ( i == sl->sl_numcsns )
2658                                         do_play = 1;
2659                         }
2660                         if ( do_play ) {
2661                                 do_present = 0;
2662                                 /* mutex is unlocked in playlog */
2663                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2664                         } else {
2665                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2666                         }
2667                 }
2668                 /* Is the CSN still present in the database? */
2669                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2670                         /* No, so a reload is required */
2671                         /* the 2.2 consumer doesn't send this hint */
2672                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2673                                 if ( ctxcsn )
2674                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2675                                 if ( sids )
2676                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2677                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2678                                 rs->sr_text = "sync cookie is stale";
2679                                 goto bailout;
2680                         }
2681                         if ( srs->sr_state.ctxcsn ) {
2682                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2683                                 srs->sr_state.ctxcsn = NULL;
2684                         }
2685                         if ( srs->sr_state.sids ) {
2686                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2687                                 srs->sr_state.sids = NULL;
2688                         }
2689                         srs->sr_state.numcsns = 0;
2690                 } else {
2691                         gotstate = 1;
2692                         /* If changed and doing Present lookup, send Present UUIDs */
2693                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2694                                 LDAP_SUCCESS ) {
2695                                 if ( ctxcsn )
2696                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2697                                 if ( sids )
2698                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2699                                 goto bailout;
2700                         }
2701                 }
2702         } else {
2703                 /* No consumer state, assume something has changed */
2704                 changed = SS_CHANGED;
2705         }
2706
2707 shortcut:
2708         /* Append CSN range to search filter, save original filter
2709          * for persistent search evaluation
2710          */
2711         if ( sop ) {
2712                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2713                 sop->s_filterstr = op->ors_filterstr;
2714                 /* correct the refcount that was set to 2 before */
2715                 sop->s_inuse--;
2716         }
2717
2718         /* If something changed, find the changes */
2719         if ( gotstate && ( changed || dirty ) ) {
2720                 Filter *fand, *fava;
2721
2722                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2723                 fand->f_choice = LDAP_FILTER_AND;
2724                 fand->f_next = NULL;
2725                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2726                 fand->f_and = fava;
2727                 fava->f_choice = LDAP_FILTER_GE;
2728                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2729                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2730 #ifdef LDAP_COMP_MATCH
2731                 fava->f_ava->aa_cf = NULL;
2732 #endif
2733                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2734                 fava->f_next = op->ors_filter;
2735                 op->ors_filter = fand;
2736                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2737                 if ( sop ) {
2738                         sop->s_flags |= PS_FIX_FILTER;
2739                 }
2740         }
2741         if ( sop ) {
2742                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2743         }
2744
2745         /* Let our callback add needed info to returned entries */
2746         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2747         ss = (searchstate *)(cb+1);
2748         ss->ss_on = on;
2749         ss->ss_so = sop;
2750         ss->ss_flags = do_present | changed;
2751         ss->ss_ctxcsn = ctxcsn;
2752         ss->ss_numcsns = numcsns;
2753         ss->ss_sids = sids;
2754         cb->sc_response = syncprov_search_response;
2755         cb->sc_private = ss;
2756         cb->sc_next = op->o_callback;
2757         op->o_callback = cb;
2758
2759         /* If this is a persistent search and no changes were reported during
2760          * the refresh phase, just invoke the response callback to transition
2761          * us into persist phase
2762          */
2763         if ( !changed && !dirty ) {
2764                 rs->sr_err = LDAP_SUCCESS;
2765                 rs->sr_nentries = 0;
2766                 send_ldap_result( op, rs );
2767                 return rs->sr_err;
2768         }
2769         return SLAP_CB_CONTINUE;
2770 }
2771
2772 static int
2773 syncprov_operational(
2774         Operation *op,
2775         SlapReply *rs )
2776 {
2777         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2778         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2779
2780         /* This prevents generating unnecessarily; frontend will strip
2781          * any statically stored copy.
2782          */
2783         if ( op->o_sync != SLAP_CONTROL_NONE )
2784                 return SLAP_CB_CONTINUE;
2785
2786         if ( rs->sr_entry &&
2787                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2788
2789                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2790                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2791                         Attribute *a, **ap = NULL;
2792
2793                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2794                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2795                                         break;
2796                         }
2797
2798                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2799                         if ( si->si_ctxcsn ) {
2800                                 if ( !a ) {
2801                                         for ( ap = &rs->sr_operational_attrs; *ap;
2802                                                 ap=&(*ap)->a_next );
2803
2804                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2805                                         *ap = a;
2806                                 }
2807
2808                                 if ( !ap ) {
2809                                         if ( rs_entry2modifiable( op, rs, on )) {
2810                                                 a = attr_find( rs->sr_entry->e_attrs,
2811                                                         slap_schema.si_ad_contextCSN );
2812                                         }
2813                                         if ( a->a_nvals != a->a_vals ) {
2814                                                 ber_bvarray_free( a->a_nvals );
2815                                         }
2816                                         a->a_nvals = NULL;
2817                                         ber_bvarray_free( a->a_vals );
2818                                         a->a_vals = NULL;
2819                                         a->a_numvals = 0;
2820                                 }
2821                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2822                         }
2823                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2824                 }
2825         }
2826         return SLAP_CB_CONTINUE;
2827 }
2828
2829 enum {
2830         SP_CHKPT = 1,
2831         SP_SESSL,
2832         SP_NOPRES,
2833         SP_USEHINT
2834 };
2835
2836 static ConfigDriver sp_cf_gen;
2837
2838 static ConfigTable spcfg[] = {
2839         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2840                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2841                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2842                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2843         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2844                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2845                         "DESC 'Session log size in ops' "
2846                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2847         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2848                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2849                         "DESC 'Omit Present phase processing' "
2850                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2851         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2852                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2853                         "DESC 'Observe Reload Hint in Request control' "
2854                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2855         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2856 };
2857
2858 static ConfigOCs spocs[] = {
2859         { "( OLcfgOvOc:1.1 "
2860                 "NAME 'olcSyncProvConfig' "
2861                 "DESC 'SyncRepl Provider configuration' "
2862                 "SUP olcOverlayConfig "
2863                 "MAY ( olcSpCheckpoint "
2864                         "$ olcSpSessionlog "
2865                         "$ olcSpNoPresent "
2866                         "$ olcSpReloadHint "
2867                 ") )",
2868                         Cft_Overlay, spcfg },
2869         { NULL, 0, NULL }
2870 };
2871
2872 static int
2873 sp_cf_gen(ConfigArgs *c)
2874 {
2875         slap_overinst           *on = (slap_overinst *)c->bi;
2876         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2877         int rc = 0;
2878
2879         if ( c->op == SLAP_CONFIG_EMIT ) {
2880                 switch ( c->type ) {
2881                 case SP_CHKPT:
2882                         if ( si->si_chkops || si->si_chktime ) {
2883                                 struct berval bv;
2884                                 /* we assume si_chktime is a multiple of 60
2885                                  * because the parsed value was originally
2886                                  * multiplied by 60 */
2887                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2888                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2889                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2890                                         rc = 1;
2891                                 } else {
2892                                         bv.bv_val = c->cr_msg;
2893                                         value_add_one( &c->rvalue_vals, &bv );
2894                                 }
2895                         } else {
2896                                 rc = 1;
2897                         }
2898                         break;
2899                 case SP_SESSL:
2900                         if ( si->si_logs ) {
2901                                 c->value_int = si->si_logs->sl_size;
2902                         } else {
2903                                 rc = 1;
2904                         }
2905                         break;
2906                 case SP_NOPRES:
2907                         if ( si->si_nopres ) {
2908                                 c->value_int = 1;
2909                         } else {
2910                                 rc = 1;
2911                         }
2912                         break;
2913                 case SP_USEHINT:
2914                         if ( si->si_usehint ) {
2915                                 c->value_int = 1;
2916                         } else {
2917                                 rc = 1;
2918                         }
2919                         break;
2920                 }
2921                 return rc;
2922         } else if ( c->op == LDAP_MOD_DELETE ) {
2923                 switch ( c->type ) {
2924                 case SP_CHKPT:
2925                         si->si_chkops = 0;
2926                         si->si_chktime = 0;
2927                         break;
2928                 case SP_SESSL:
2929                         if ( si->si_logs )
2930                                 si->si_logs->sl_size = 0;
2931                         else
2932                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2933                         break;
2934                 case SP_NOPRES:
2935                         if ( si->si_nopres )
2936                                 si->si_nopres = 0;
2937                         else
2938                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2939                         break;
2940                 case SP_USEHINT:
2941                         if ( si->si_usehint )
2942                                 si->si_usehint = 0;
2943                         else
2944                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2945                         break;
2946                 }
2947                 return rc;
2948         }
2949         switch ( c->type ) {
2950         case SP_CHKPT:
2951                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2952                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2953                                 c->argv[0], c->argv[1] );
2954                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2955                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2956                         return ARG_BAD_CONF;
2957                 }
2958                 if ( si->si_chkops <= 0 ) {
2959                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2960                                 c->argv[0], si->si_chkops );
2961                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2962                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2963                         return ARG_BAD_CONF;
2964                 }
2965                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2966                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2967                                 c->argv[0], c->argv[1] );
2968                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2969                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2970                         return ARG_BAD_CONF;
2971                 }
2972                 if ( si->si_chktime <= 0 ) {
2973                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2974                                 c->argv[0], si->si_chkops );
2975                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2976                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2977                         return ARG_BAD_CONF;
2978                 }
2979                 si->si_chktime *= 60;
2980                 break;
2981         case SP_SESSL: {
2982                 sessionlog *sl;
2983                 int size = c->value_int;
2984
2985                 if ( size < 0 ) {
2986                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2987                                 c->argv[0], size );
2988                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2989                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2990                         return ARG_BAD_CONF;
2991                 }
2992                 sl = si->si_logs;
2993                 if ( !sl ) {
2994                         sl = ch_malloc( sizeof( sessionlog ));
2995                         sl->sl_mincsn = NULL;
2996                         sl->sl_sids = NULL;
2997                         sl->sl_num = 0;
2998                         sl->sl_numcsns = 0;
2999                         sl->sl_head = sl->sl_tail = NULL;
3000                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3001                         si->si_logs = sl;
3002                 }
3003                 sl->sl_size = size;
3004                 }
3005                 break;
3006         case SP_NOPRES:
3007                 si->si_nopres = c->value_int;
3008                 break;
3009         case SP_USEHINT:
3010                 si->si_usehint = c->value_int;
3011                 break;
3012         }
3013         return rc;
3014 }
3015
3016 /* ITS#3456 we cannot run this search on the main thread, must use a
3017  * child thread in order to insure we have a big enough stack.
3018  */
3019 static void *
3020 syncprov_db_otask(
3021         void *ptr
3022 )
3023 {
3024         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3025         return NULL;
3026 }
3027
3028
3029 /* Read any existing contextCSN from the underlying db.
3030  * Then search for any entries newer than that. If no value exists,
3031  * just generate it. Cache whatever result.
3032  */
3033 static int
3034 syncprov_db_open(
3035         BackendDB *be,
3036         ConfigReply *cr
3037 )
3038 {
3039         slap_overinst   *on = (slap_overinst *) be->bd_info;
3040         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3041
3042         Connection conn = { 0 };
3043         OperationBuffer opbuf;
3044         Operation *op;
3045         Entry *e = NULL;
3046         Attribute *a;
3047         int rc;
3048         void *thrctx = NULL;
3049
3050         if ( !SLAP_LASTMOD( be )) {
3051                 Debug( LDAP_DEBUG_ANY,
3052                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3053                 return -1;
3054         }
3055
3056         if ( slapMode & SLAP_TOOL_MODE ) {
3057                 return 0;
3058         }
3059
3060         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3061         if ( rc ) {
3062                 return rc;
3063         }
3064
3065         thrctx = ldap_pvt_thread_pool_context();
3066         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3067         op = &opbuf.ob_op;
3068         op->o_bd = be;
3069         op->o_dn = be->be_rootdn;
3070         op->o_ndn = be->be_rootndn;
3071
3072         if ( SLAP_SYNC_SUBENTRY( be )) {
3073                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3074                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3075         } else {
3076                 si->si_contextdn = be->be_nsuffix[0];
3077         }
3078         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3079                 slap_schema.si_ad_contextCSN, 0, &e, on );
3080
3081         if ( e ) {
3082                 ldap_pvt_thread_t tid;
3083
3084                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3085                 if ( a ) {
3086                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3087                         si->si_numcsns = a->a_numvals;
3088                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3089                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3090                 }
3091                 overlay_entry_release_ov( op, e, 0, on );
3092                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3093                         op->o_tag = LDAP_REQ_SEARCH;
3094                         op->o_req_dn = be->be_suffix[0];
3095                         op->o_req_ndn = be->be_nsuffix[0];
3096                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3097                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3098                         ldap_pvt_thread_join( tid, NULL );
3099                 }
3100         }
3101
3102         /* Didn't find a contextCSN, should we generate one? */
3103         if ( !si->si_ctxcsn ) {
3104                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3105                 struct berval csn;
3106
3107                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3108                 /* If we're also a consumer, then don't generate anything.
3109                  * Wait for our provider to send it to us, or for a local
3110                  * modify if we have multimaster.
3111                  */
3112                         goto out;
3113                 }
3114                 csn.bv_val = csnbuf;
3115                 csn.bv_len = sizeof( csnbuf );
3116                 slap_get_csn( op, &csn, 0 );
3117                 value_add_one( &si->si_ctxcsn, &csn );
3118                 si->si_numcsns = 1;
3119                 si->si_sids = ch_malloc( sizeof(int) );
3120                 si->si_sids[0] = slap_serverID;
3121
3122                 /* make sure we do a checkpoint on close */
3123                 si->si_numops++;
3124         }
3125
3126         /* Initialize the sessionlog mincsn */
3127         if ( si->si_logs && si->si_numcsns ) {
3128                 sessionlog *sl = si->si_logs;
3129                 int i;
3130                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3131                 sl->sl_numcsns = si->si_numcsns;
3132                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3133                 for ( i=0; i < si->si_numcsns; i++ )
3134                         sl->sl_sids[i] = si->si_sids[i];
3135         }
3136
3137 out:
3138         op->o_bd->bd_info = (BackendInfo *)on;
3139         return 0;
3140 }
3141
3142 /* Write the current contextCSN into the underlying db.
3143  */
3144 static int
3145 syncprov_db_close(
3146         BackendDB *be,
3147         ConfigReply *cr
3148 )
3149 {
3150     slap_overinst   *on = (slap_overinst *) be->bd_info;
3151     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3152 #ifdef SLAP_CONFIG_DELETE
3153         syncops *so, *sonext;
3154 #endif /* SLAP_CONFIG_DELETE */
3155
3156         if ( slapMode & SLAP_TOOL_MODE ) {
3157                 return 0;
3158         }
3159         if ( si->si_numops ) {
3160                 Connection conn = {0};
3161                 OperationBuffer opbuf;
3162                 Operation *op;
3163                 void *thrctx;
3164
3165                 thrctx = ldap_pvt_thread_pool_context();
3166                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3167                 op = &opbuf.ob_op;
3168                 op->o_bd = be;
3169                 op->o_dn = be->be_rootdn;
3170                 op->o_ndn = be->be_rootndn;
3171                 syncprov_checkpoint( op, on );
3172         }
3173
3174 #ifdef SLAP_CONFIG_DELETE
3175         if ( !slapd_shutdown ) {
3176                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3177                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3178                         SlapReply rs = {REP_RESULT};
3179                         rs.sr_err = LDAP_UNAVAILABLE;
3180                         send_ldap_result( so->s_op, &rs );
3181                         sonext=so->s_next;
3182                         syncprov_drop_psearch( so, 0);
3183                 }
3184                 si->si_ops=NULL;
3185                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3186         }
3187         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3188 #endif /* SLAP_CONFIG_DELETE */
3189
3190     return 0;
3191 }
3192
3193 static int
3194 syncprov_db_init(
3195         BackendDB *be,
3196         ConfigReply *cr
3197 )
3198 {
3199         slap_overinst   *on = (slap_overinst *)be->bd_info;
3200         syncprov_info_t *si;
3201
3202         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3203                 Debug( LDAP_DEBUG_ANY,
3204                         "syncprov must be instantiated within a database.\n",
3205                         0, 0, 0 );
3206                 return 1;
3207         }
3208
3209         si = ch_calloc(1, sizeof(syncprov_info_t));
3210         on->on_bi.bi_private = si;
3211         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3212         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3213         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3214         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3215
3216         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3217         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3218         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3219         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3220
3221         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3222         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3223
3224         return 0;
3225 }
3226
3227 static int
3228 syncprov_db_destroy(
3229         BackendDB *be,
3230         ConfigReply *cr
3231 )
3232 {
3233         slap_overinst   *on = (slap_overinst *)be->bd_info;
3234         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3235
3236         if ( si ) {
3237                 if ( si->si_logs ) {
3238                         sessionlog *sl = si->si_logs;
3239                         slog_entry *se = sl->sl_head;
3240
3241                         while ( se ) {
3242                                 slog_entry *se_next = se->se_next;
3243                                 ch_free( se );
3244                                 se = se_next;
3245                         }
3246                         if ( sl->sl_mincsn )
3247                                 ber_bvarray_free( sl->sl_mincsn );
3248                         if ( sl->sl_sids )
3249                                 ch_free( sl->sl_sids );
3250
3251                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3252                         ch_free( si->si_logs );
3253                 }
3254                 if ( si->si_ctxcsn )
3255                         ber_bvarray_free( si->si_ctxcsn );
3256                 if ( si->si_sids )
3257                         ch_free( si->si_sids );
3258                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3259                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3260                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3261                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3262                 ch_free( si );
3263         }
3264
3265         return 0;
3266 }
3267
3268 static int syncprov_parseCtrl (
3269         Operation *op,
3270         SlapReply *rs,
3271         LDAPControl *ctrl )
3272 {
3273         ber_tag_t tag;
3274         BerElementBuffer berbuf;
3275         BerElement *ber = (BerElement *)&berbuf;
3276         ber_int_t mode;
3277         ber_len_t len;
3278         struct berval cookie = BER_BVNULL;
3279         sync_control *sr;
3280         int rhint = 0;
3281
3282         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3283                 rs->sr_text = "Sync control specified multiple times";
3284                 return LDAP_PROTOCOL_ERROR;
3285         }
3286
3287         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3288                 rs->sr_text = "Sync control specified with pagedResults control";
3289                 return LDAP_PROTOCOL_ERROR;
3290         }
3291
3292         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3293                 rs->sr_text = "Sync control value is absent";
3294                 return LDAP_PROTOCOL_ERROR;
3295         }
3296
3297         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3298                 rs->sr_text = "Sync control value is empty";
3299                 return LDAP_PROTOCOL_ERROR;
3300         }
3301
3302         /* Parse the control value
3303          *      syncRequestValue ::= SEQUENCE {
3304          *              mode   ENUMERATED {
3305          *                      -- 0 unused
3306          *                      refreshOnly             (1),
3307          *                      -- 2 reserved
3308          *                      refreshAndPersist       (3)
3309          *              },
3310          *              cookie  syncCookie OPTIONAL
3311          *      }
3312          */
3313
3314         ber_init2( ber, &ctrl->ldctl_value, 0 );
3315
3316         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3317                 rs->sr_text = "Sync control : mode decoding error";
3318                 return LDAP_PROTOCOL_ERROR;
3319         }
3320
3321         switch( mode ) {
3322         case LDAP_SYNC_REFRESH_ONLY:
3323                 mode = SLAP_SYNC_REFRESH;
3324                 break;
3325         case LDAP_SYNC_REFRESH_AND_PERSIST:
3326                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3327                 break;
3328         default:
3329                 rs->sr_text = "Sync control : unknown update mode";
3330                 return LDAP_PROTOCOL_ERROR;
3331         }
3332
3333         tag = ber_peek_tag( ber, &len );
3334
3335         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3336                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3337                         rs->sr_text = "Sync control : cookie decoding error";
3338                         return LDAP_PROTOCOL_ERROR;
3339                 }
3340                 tag = ber_peek_tag( ber, &len );
3341         }
3342         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3343                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3344                         rs->sr_text = "Sync control : rhint decoding error";
3345                         return LDAP_PROTOCOL_ERROR;
3346                 }
3347         }
3348         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3349                         rs->sr_text = "Sync control : decoding error";
3350                         return LDAP_PROTOCOL_ERROR;
3351         }
3352         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3353         sr->sr_rhint = rhint;
3354         if (!BER_BVISNULL(&cookie)) {
3355                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3356                 /* If parse fails, pretend no cookie was sent */
3357                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3358                         sr->sr_state.rid == -1 ) {
3359                         if ( sr->sr_state.ctxcsn ) {
3360                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3361                                 sr->sr_state.ctxcsn = NULL;
3362                         }
3363                         sr->sr_state.numcsns = 0;
3364                 }
3365         }
3366
3367         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3368
3369         op->o_sync = ctrl->ldctl_iscritical
3370                 ? SLAP_CONTROL_CRITICAL
3371                 : SLAP_CONTROL_NONCRITICAL;
3372
3373         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3374
3375         return LDAP_SUCCESS;
3376 }
3377
3378 /* This overlay is set up for dynamic loading via moduleload. For static
3379  * configuration, you'll need to arrange for the slap_overinst to be
3380  * initialized and registered by some other function inside slapd.
3381  */
3382
3383 static slap_overinst            syncprov;
3384
3385 int
3386 syncprov_initialize()
3387 {
3388         int rc;
3389
3390         rc = register_supported_control( LDAP_CONTROL_SYNC,
3391                 SLAP_CTRL_SEARCH, NULL,
3392                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3393         if ( rc != LDAP_SUCCESS ) {
3394                 Debug( LDAP_DEBUG_ANY,
3395                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3396                 return rc;
3397         }
3398
3399         syncprov.on_bi.bi_type = "syncprov";
3400         syncprov.on_bi.bi_db_init = syncprov_db_init;
3401         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3402         syncprov.on_bi.bi_db_open = syncprov_db_open;
3403         syncprov.on_bi.bi_db_close = syncprov_db_close;
3404
3405         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3406         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3407
3408         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3409         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3410         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3411         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3412         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3413         syncprov.on_bi.bi_op_search = syncprov_op_search;
3414         syncprov.on_bi.bi_extended = syncprov_op_extended;
3415         syncprov.on_bi.bi_operational = syncprov_operational;
3416
3417         syncprov.on_bi.bi_cf_ocs = spocs;
3418
3419         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3420
3421         rc = config_register_schema( spcfg, spocs );
3422         if ( rc ) return rc;
3423
3424         return overlay_register( &syncprov );
3425 }
3426
3427 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3428 int
3429 init_module( int argc, char *argv[] )
3430 {
3431         return syncprov_initialize();
3432 }
3433 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3434
3435 #endif /* defined(SLAPD_OVER_SYNCPROV) */