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 2004-2010 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         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         struct berval   sl_mincsn;
 117         int             sl_num;
 118         int             sl_size;
 119         slog_entry *sl_head;
 120         slog_entry *sl_tail;
 121         ldap_pvt_thread_mutex_t sl_mutex;
 122 } sessionlog;
 123
 124 /* The main state for this overlay */
 125 typedef struct syncprov_info_t {
 126         syncops         *si_ops;
 127         BerVarray       si_ctxcsn;      /* ldapsync context */
 128         struct berval   si_contextdn;
 129         int             *si_sids;
 130         int             si_numcsns;
 131         int             si_chkops;      /* checkpointing info */
 132         int             si_chktime;
 133         int             si_numops;      /* number of ops since last checkpoint */
 134         int             si_nopres;      /* Skip present phase */
 135         int             si_usehint;     /* use reload hint */
 136         time_t  si_chklast;     /* time of last checkpoint */
 137         Avlnode *si_mods;       /* entries being modified */
 138         sessionlog      *si_logs;
 139         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 140         ldap_pvt_thread_mutex_t si_ops_mutex;
 141         ldap_pvt_thread_mutex_t si_mods_mutex;
 142         ldap_pvt_thread_mutex_t si_resp_mutex;
 143 } syncprov_info_t;
 144
 145 typedef struct opcookie {
 146         slap_overinst *son;
 147         syncmatches *smatches;
 148         modtarget *smt;
 149         Entry *se;
 150         struct berval sdn;      /* DN of entry, for deletes */
 151         struct berval sndn;
 152         struct berval suuid;    /* UUID of entry */
 153         struct berval sctxcsn;
 154         short osid;     /* sid of op csn */
 155         short rsid;     /* sid of relay */
 156         short sreference;       /* Is the entry a reference? */
 157 } opcookie;
 158
 159 typedef struct mutexint {
 160         ldap_pvt_thread_mutex_t mi_mutex;
 161         int mi_int;
 162 } mutexint;
 163
 164 typedef struct fbase_cookie {
 165         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 166         syncops *fss;   /* persistent search we're testing against */
 167         int fbase;      /* if TRUE we found the search base and it's still valid */
 168         int fscope;     /* if TRUE then fdn is within the psearch scope */
 169 } fbase_cookie;
 170
 171 static AttributeName csn_anlist[3];
 172 static AttributeName uuid_anlist[2];
 173
 174 /* Build a LDAPsync intermediate state control */
 175 static int
 176 syncprov_state_ctrl(
 177         Operation       *op,
 178         SlapReply       *rs,
 179         Entry           *e,
 180         int             entry_sync_state,
 181         LDAPControl     **ctrls,
 182         int             num_ctrls,
 183         int             send_cookie,
 184         struct berval   *cookie )
 185 {
 186         Attribute* a;
 187         int ret;
 188
 189         BerElementBuffer berbuf;
 190         BerElement *ber = (BerElement *)&berbuf;
 191
 192         struct berval   entryuuid_bv = BER_BVNULL;
 193
 194         ber_init2( ber, 0, LBER_USE_DER );
 195         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 196
 197         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 198
 199         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 200                 AttributeDescription *desc = a->a_desc;
 201                 if ( desc == slap_schema.si_ad_entryUUID ) {
 202                         entryuuid_bv = a->a_nvals[0];
 203                         break;
 204                 }
 205         }
 206
 207         /* FIXME: what if entryuuid is NULL or empty ? */
 208
 209         if ( send_cookie && cookie ) {
 210                 ber_printf( ber, "{eOON}",
 211                         entry_sync_state, &entryuuid_bv, cookie );
 212         } else {
 213                 ber_printf( ber, "{eON}",
 214                         entry_sync_state, &entryuuid_bv );
 215         }
 216
 217         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 218         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 219         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 220
 221         ber_free_buf( ber );
 222
 223         if ( ret < 0 ) {
 224                 Debug( LDAP_DEBUG_TRACE,
 225                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 226                         0, 0, 0 );
 227                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 228                 return ret;
 229         }
 230
 231         return LDAP_SUCCESS;
 232 }
 233
 234 /* Build a LDAPsync final state control */
 235 static int
 236 syncprov_done_ctrl(
 237         Operation       *op,
 238         SlapReply       *rs,
 239         LDAPControl     **ctrls,
 240         int                     num_ctrls,
 241         int                     send_cookie,
 242         struct berval *cookie,
 243         int                     refreshDeletes )
 244 {
 245         int ret;
 246         BerElementBuffer berbuf;
 247         BerElement *ber = (BerElement *)&berbuf;
 248
 249         ber_init2( ber, NULL, LBER_USE_DER );
 250         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 251
 252         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 253
 254         ber_printf( ber, "{" );
 255         if ( send_cookie && cookie ) {
 256                 ber_printf( ber, "O", cookie );
 257         }
 258         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 259                 ber_printf( ber, "b", refreshDeletes );
 260         }
 261         ber_printf( ber, "N}" );
 262
 263         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 264         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 265         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 266
 267         ber_free_buf( ber );
 268
 269         if ( ret < 0 ) {
 270                 Debug( LDAP_DEBUG_TRACE,
 271                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 272                         0, 0, 0 );
 273                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 274                 return ret;
 275         }
 276
 277         return LDAP_SUCCESS;
 278 }
 279
 280 static int
 281 syncprov_sendinfo(
 282         Operation       *op,
 283         SlapReply       *rs,
 284         int                     type,
 285         struct berval *cookie,
 286         int                     refreshDone,
 287         BerVarray       syncUUIDs,
 288         int                     refreshDeletes )
 289 {
 290         BerElementBuffer berbuf;
 291         BerElement *ber = (BerElement *)&berbuf;
 292         struct berval rspdata;
 293
 294         int ret;
 295
 296         ber_init2( ber, NULL, LBER_USE_DER );
 297         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 298
 299         if ( type ) {
 300                 switch ( type ) {
 301                 case LDAP_TAG_SYNC_NEW_COOKIE:
 302                         ber_printf( ber, "tO", type, cookie );
 303                         break;
 304                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 305                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 306                         ber_printf( ber, "t{", type );
 307                         if ( cookie ) {
 308                                 ber_printf( ber, "O", cookie );
 309                         }
 310                         if ( refreshDone == 0 ) {
 311                                 ber_printf( ber, "b", refreshDone );
 312                         }
 313                         ber_printf( ber, "N}" );
 314                         break;
 315                 case LDAP_TAG_SYNC_ID_SET:
 316                         ber_printf( ber, "t{", type );
 317                         if ( cookie ) {
 318                                 ber_printf( ber, "O", cookie );
 319                         }
 320                         if ( refreshDeletes == 1 ) {
 321                                 ber_printf( ber, "b", refreshDeletes );
 322                         }
 323                         ber_printf( ber, "[W]", syncUUIDs );
 324                         ber_printf( ber, "N}" );
 325                         break;
 326                 default:
 327                         Debug( LDAP_DEBUG_TRACE,
 328                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 329                                 type, 0, 0 );
 330                         return LDAP_OTHER;
 331                 }
 332         }
 333
 334         ret = ber_flatten2( ber, &rspdata, 0 );
 335
 336         if ( ret < 0 ) {
 337                 Debug( LDAP_DEBUG_TRACE,
 338                         "syncprov_sendinfo: ber_flatten2 failed\n",
 339                         0, 0, 0 );
 340                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 341                 return ret;
 342         }
 343
 344         rs->sr_rspoid = LDAP_SYNC_INFO;
 345         rs->sr_rspdata = &rspdata;
 346         send_ldap_intermediate( op, rs );
 347         rs->sr_rspdata = NULL;
 348         ber_free_buf( ber );
 349
 350         return LDAP_SUCCESS;
 351 }
 352
 353 /* Find a modtarget in an AVL tree */
 354 static int
 355 sp_avl_cmp( const void *c1, const void *c2 )
 356 {
 357         const modtarget *m1, *m2;
 358         int rc;
 359
 360         m1 = c1; m2 = c2;
 361         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 362
 363         if ( rc ) return rc;
 364         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 365 }
 366
 367 /* syncprov_findbase:
 368  *   finds the true DN of the base of a search (with alias dereferencing) and
 369  * checks to make sure the base entry doesn't get replaced with a different
 370  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 371  * change is detected, any persistent search on this base must be terminated /
 372  * reloaded.
 373  *   On the first call, we just save the DN and entryID. On subsequent calls
 374  * we compare the DN and entryID with the saved values.
 375  */
 376 static int
 377 findbase_cb( Operation *op, SlapReply *rs )
 378 {
 379         slap_callback *sc = op->o_callback;
 380
 381         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 382                 fbase_cookie *fc = sc->sc_private;
 383
 384                 /* If no entryID, we're looking for the first time.
 385                  * Just store whatever we got.
 386                  */
 387                 if ( fc->fss->s_eid == NOID ) {
 388                         fc->fbase = 2;
 389                         fc->fss->s_eid = rs->sr_entry->e_id;
 390                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 391
 392                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 393                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 394
 395                 /* OK, the DN is the same and the entryID is the same. */
 396                         fc->fbase = 1;
 397                 }
 398         }
 399         if ( rs->sr_err != LDAP_SUCCESS ) {
 400                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 401         }
 402         return LDAP_SUCCESS;
 403 }
 404
 405 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 406 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 407
 408 static int
 409 syncprov_findbase( Operation *op, fbase_cookie *fc )
 410 {
 411         /* Use basic parameters from syncrepl search, but use
 412          * current op's threadctx / tmpmemctx
 413          */
 414         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 415         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 416                 slap_callback cb = {0};
 417                 Operation fop;
 418                 SlapReply frs = { REP_RESULT };
 419                 int rc;
 420
 421                 fc->fss->s_flags ^= PS_FIND_BASE;
 422                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 423
 424                 fop = *fc->fss->s_op;
 425
 426                 fop.o_bd = fop.o_bd->bd_self;
 427                 fop.o_hdr = op->o_hdr;
 428                 fop.o_time = op->o_time;
 429                 fop.o_tincr = op->o_tincr;
 430
 431                 cb.sc_response = findbase_cb;
 432                 cb.sc_private = fc;
 433
 434                 fop.o_sync_mode = 0;    /* turn off sync mode */
 435                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 436                 fop.o_callback = &cb;
 437                 fop.o_tag = LDAP_REQ_SEARCH;
 438                 fop.ors_scope = LDAP_SCOPE_BASE;
 439                 fop.ors_limit = NULL;
 440                 fop.ors_slimit = 1;
 441                 fop.ors_tlimit = SLAP_NO_LIMIT;
 442                 fop.ors_attrs = slap_anlist_no_attrs;
 443                 fop.ors_attrsonly = 1;
 444                 fop.ors_filter = &generic_filter;
 445                 fop.ors_filterstr = generic_filterstr;
 446
 447                 rc = fop.o_bd->be_search( &fop, &frs );
 448         } else {
 449                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 450                 fc->fbase = 1;
 451         }
 452
 453         /* After the first call, see if the fdn resides in the scope */
 454         if ( fc->fbase == 1 ) {
 455                 switch ( fc->fss->s_op->ors_scope ) {
 456                 case LDAP_SCOPE_BASE:
 457                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 458                         break;
 459                 case LDAP_SCOPE_ONELEVEL: {
 460                         struct berval pdn;
 461                         dnParent( fc->fdn, &pdn );
 462                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 463                         break; }
 464                 case LDAP_SCOPE_SUBTREE:
 465                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 466                         break;
 467                 case LDAP_SCOPE_SUBORDINATE:
 468                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 469                                 !dn_match( fc->fdn, &fc->fss->s_base );
 470                         break;
 471                 }
 472         }
 473
 474         if ( fc->fbase )
 475                 return LDAP_SUCCESS;
 476
 477         /* If entryID has changed, then the base of this search has
 478          * changed. Invalidate the psearch.
 479          */
 480         return LDAP_NO_SUCH_OBJECT;
 481 }
 482
 483 /* syncprov_findcsn:
 484  *   This function has three different purposes, but they all use a search
 485  * that filters on entryCSN so they're combined here.
 486  * 1: at startup time, after a contextCSN has been read from the database,
 487  * we search for all entries with CSN >= contextCSN in case the contextCSN
 488  * was not checkpointed at the previous shutdown.
 489  *
 490  * 2: when the current contextCSN is known and we have a sync cookie, we search
 491  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 492  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 493  *
 494  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 495  * CSN, and generate Present records for them. We always collect this result
 496  * in SyncID sets, even if there's only one match.
 497  */
 498 typedef enum find_csn_t {
 499         FIND_MAXCSN     = 1,
 500         FIND_CSN        = 2,
 501         FIND_PRESENT    = 3
 502 } find_csn_t;
 503
 504 static int
 505 findmax_cb( Operation *op, SlapReply *rs )
 506 {
 507         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 508                 struct berval *maxcsn = op->o_callback->sc_private;
 509                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 510                         slap_schema.si_ad_entryCSN );
 511
 512                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 513                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 514                         maxcsn->bv_len = a->a_vals[0].bv_len;
 515                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 516                 }
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 static int
 522 findcsn_cb( Operation *op, SlapReply *rs )
 523 {
 524         slap_callback *sc = op->o_callback;
 525
 526         /* We just want to know that at least one exists, so it's OK if
 527          * we exceed the unchecked limit.
 528          */
 529         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 530                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 531                 sc->sc_private = (void *)1;
 532         }
 533         return LDAP_SUCCESS;
 534 }
 535
 536 /* Build a list of entryUUIDs for sending in a SyncID set */
 537
 538 #define UUID_LEN        16
 539
 540 typedef struct fpres_cookie {
 541         int num;
 542         BerVarray uuids;
 543         char *last;
 544 } fpres_cookie;
 545
 546 static int
 547 findpres_cb( Operation *op, SlapReply *rs )
 548 {
 549         slap_callback *sc = op->o_callback;
 550         fpres_cookie *pc = sc->sc_private;
 551         Attribute *a;
 552         int ret = SLAP_CB_CONTINUE;
 553
 554         switch ( rs->sr_type ) {
 555         case REP_SEARCH:
 556                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 557                 if ( a ) {
 558                         pc->uuids[pc->num].bv_val = pc->last;
 559                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 560                                 pc->uuids[pc->num].bv_len );
 561                         pc->num++;
 562                         pc->last = pc->uuids[pc->num].bv_val;
 563                         pc->uuids[pc->num].bv_val = NULL;
 564                 }
 565                 ret = LDAP_SUCCESS;
 566                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 567                         break;
 568                 /* FALLTHRU */
 569         case REP_RESULT:
 570                 ret = rs->sr_err;
 571                 if ( pc->num ) {
 572                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 573                                 0, pc->uuids, 0 );
 574                         pc->uuids[pc->num].bv_val = pc->last;
 575                         pc->num = 0;
 576                         pc->last = pc->uuids[0].bv_val;
 577                 }
 578                 break;
 579         default:
 580                 break;
 581         }
 582         return ret;
 583 }
 584
 585 static int
 586 syncprov_findcsn( Operation *op, find_csn_t mode )
 587 {
 588         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 589         syncprov_info_t         *si = on->on_bi.bi_private;
 590
 591         slap_callback cb = {0};
 592         Operation fop;
 593         SlapReply frs = { REP_RESULT };
 594         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 595         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 596         struct berval maxcsn;
 597         Filter cf;
 598         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 599         fpres_cookie pcookie;
 600         sync_control *srs = NULL;
 601         struct slap_limits_set fc_limits;
 602         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 603         int maxid;
 604
 605         if ( mode != FIND_MAXCSN ) {
 606                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 607         }
 608
 609         fop = *op;
 610         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 611         /* We want pure entries, not referrals */
 612         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 613
 614         cf.f_ava = &eq;
 615         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 616         BER_BVZERO( &cf.f_av_value );
 617         cf.f_next = NULL;
 618
 619         fop.o_callback = &cb;
 620         fop.ors_limit = NULL;
 621         fop.ors_tlimit = SLAP_NO_LIMIT;
 622         fop.ors_filter = &cf;
 623         fop.ors_filterstr.bv_val = buf;
 624
 625 again:
 626         switch( mode ) {
 627         case FIND_MAXCSN:
 628                 cf.f_choice = LDAP_FILTER_GE;
 629                 /* If there are multiple CSNs, use the one with our serverID */
 630                 for ( i=0; i<si->si_numcsns; i++) {
 631                         if ( slap_serverID == si->si_sids[i] ) {
 632                                 maxid = i;
 633                                 break;
 634                         }
 635                 }
 636                 if ( i == si->si_numcsns ) {
 637                         /* No match: this is multimaster, and none of the content in the DB
 638                          * originated locally. Treat like no CSN.
 639                          */
 640                         return LDAP_NO_SUCH_OBJECT;
 641                 }
 642                 cf.f_av_value = si->si_ctxcsn[maxid];
 643                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 644                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 645                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 646                         return LDAP_OTHER;
 647                 }
 648                 fop.ors_attrsonly = 0;
 649                 fop.ors_attrs = csn_anlist;
 650                 fop.ors_slimit = SLAP_NO_LIMIT;
 651                 cb.sc_private = &maxcsn;
 652                 cb.sc_response = findmax_cb;
 653                 strcpy( cbuf, cf.f_av_value.bv_val );
 654                 maxcsn.bv_val = cbuf;
 655                 maxcsn.bv_len = cf.f_av_value.bv_len;
 656                 break;
 657         case FIND_CSN:
 658                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 659                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 660                         /* If there are multiple CSNs, use the smallest */
 661                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 662                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 663                                         > 0 ) {
 664                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 665                                 }
 666                         }
 667                 }
 668                 /* Look for exact match the first time */
 669                 if ( findcsn_retry ) {
 670                         cf.f_choice = LDAP_FILTER_EQUALITY;
 671                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 672                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 673                 /* On retry, look for <= */
 674                 } else {
 675                         cf.f_choice = LDAP_FILTER_LE;
 676                         fop.ors_limit = &fc_limits;
 677                         memset( &fc_limits, 0, sizeof( fc_limits ));
 678                         fc_limits.lms_s_unchecked = 1;
 679                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 680                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 681                 }
 682                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 683                         return LDAP_OTHER;
 684                 }
 685                 fop.ors_attrsonly = 1;
 686                 fop.ors_attrs = slap_anlist_no_attrs;
 687                 fop.ors_slimit = 1;
 688                 cb.sc_private = NULL;
 689                 cb.sc_response = findcsn_cb;
 690                 break;
 691         case FIND_PRESENT:
 692                 fop.ors_filter = op->ors_filter;
 693                 fop.ors_filterstr = op->ors_filterstr;
 694                 fop.ors_attrsonly = 0;
 695                 fop.ors_attrs = uuid_anlist;
 696                 fop.ors_slimit = SLAP_NO_LIMIT;
 697                 cb.sc_private = &pcookie;
 698                 cb.sc_response = findpres_cb;
 699                 pcookie.num = 0;
 700
 701                 /* preallocate storage for a full set */
 702                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 703                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 704                         op->o_tmpmemctx );
 705                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 706                 pcookie.uuids[0].bv_val = pcookie.last;
 707                 pcookie.uuids[0].bv_len = UUID_LEN;
 708                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 709                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 710                         pcookie.uuids[i].bv_len = UUID_LEN;
 711                 }
 712                 break;
 713         }
 714
 715         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 716         fop.o_bd->be_search( &fop, &frs );
 717         fop.o_bd->bd_info = (BackendInfo *)on;
 718
 719         switch( mode ) {
 720         case FIND_MAXCSN:
 721                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 722 #ifdef CHECK_CSN
 723                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 724                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 725 #endif
 726                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 727                         si->si_numops++;        /* ensure a checkpoint */
 728                 }
 729                 break;
 730         case FIND_CSN:
 731                 /* If matching CSN was not found, invalidate the context. */
 732                 if ( !cb.sc_private ) {
 733                         /* If we didn't find an exact match, then try for <= */
 734                         if ( findcsn_retry ) {
 735                                 findcsn_retry = 0;
 736                                 goto again;
 737                         }
 738                         rc = LDAP_NO_SUCH_OBJECT;
 739                 }
 740                 break;
 741         case FIND_PRESENT:
 742                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 743                 break;
 744         }
 745
 746         return rc;
 747 }
 748
 749 /* Should find a place to cache these */
 750 static mutexint *get_mutexint()
 751 {
 752         mutexint *mi = ch_malloc( sizeof( mutexint ));
 753         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 754         mi->mi_int = 1;
 755         return mi;
 756 }
 757
 758 static void inc_mutexint( mutexint *mi )
 759 {
 760         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 761         mi->mi_int++;
 762         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 763 }
 764
 765 /* return resulting counter */
 766 static int dec_mutexint( mutexint *mi )
 767 {
 768         int i;
 769         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 770         i = --mi->mi_int;
 771         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 772         if ( !i ) {
 773                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 774                 ch_free( mi );
 775         }
 776         return i;
 777 }
 778
 779 static void
 780 syncprov_free_syncop( syncops *so )
 781 {
 782         syncres *sr, *srnext;
 783         GroupAssertion *ga, *gnext;
 784
 785         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 786         if ( --so->s_inuse > 0 ) {
 787                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 788                 return;
 789         }
 790         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 791         if ( so->s_flags & PS_IS_DETACHED ) {
 792                 filter_free( so->s_op->ors_filter );
 793                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 794                         gnext = ga->ga_next;
 795                         ch_free( ga );
 796                 }
 797                 ch_free( so->s_op );
 798         }
 799         ch_free( so->s_base.bv_val );
 800         for ( sr=so->s_res; sr; sr=srnext ) {
 801                 srnext = sr->s_next;
 802                 if ( sr->s_e ) {
 803                         if ( !dec_mutexint( sr->s_e->e_private )) {
 804                                 sr->s_e->e_private = NULL;
 805                                 entry_free( sr->s_e );
 806                         }
 807                 }
 808                 ch_free( sr );
 809         }
 810         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 811         ch_free( so );
 812 }
 813
 814 /* Send a persistent search response */
 815 static int
 816 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 817 {
 818         slap_overinst *on = opc->son;
 819
 820         SlapReply rs = { REP_SEARCH };
 821         LDAPControl *ctrls[2];
 822         struct berval cookie = BER_BVNULL, csns[2];
 823         Entry e_uuid = {0};
 824         Attribute a_uuid = {0};
 825
 826         if ( so->s_op->o_abandon )
 827                 return SLAPD_ABANDON;
 828
 829         ctrls[1] = NULL;
 830         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 831                 csns[0] = opc->sctxcsn;
 832                 BER_BVZERO( &csns[1] );
 833                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 834         }
 835
 836 #ifdef LDAP_DEBUG
 837         if ( so->s_sid > 0 ) {
 838                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 839                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 840         } else {
 841                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 842                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 843         }
 844 #endif
 845
 846         e_uuid.e_attrs = &a_uuid;
 847         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 848         a_uuid.a_nvals = &opc->suuid;
 849         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 850                 mode, ctrls, 0, 1, &cookie );
 851         if ( !BER_BVISNULL( &cookie )) {
 852                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 853         }
 854
 855         rs.sr_ctrls = ctrls;
 856         rs.sr_entry = &e_uuid;
 857         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 858                 e_uuid = *opc->se;
 859                 e_uuid.e_private = NULL;
 860         }
 861
 862         switch( mode ) {
 863         case LDAP_SYNC_ADD:
 864                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 865                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 866                         rs.sr_err = send_search_reference( op, &rs );
 867                         ber_bvarray_free( rs.sr_ref );
 868                         break;
 869                 }
 870                 /* fallthru */
 871         case LDAP_SYNC_MODIFY:
 872                 rs.sr_attrs = op->ors_attrs;
 873                 rs.sr_err = send_search_entry( op, &rs );
 874                 break;
 875         case LDAP_SYNC_DELETE:
 876                 e_uuid.e_attrs = NULL;
 877                 e_uuid.e_name = opc->sdn;
 878                 e_uuid.e_nname = opc->sndn;
 879                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 880                         struct berval bv = BER_BVNULL;
 881                         rs.sr_ref = &bv;
 882                         rs.sr_err = send_search_reference( op, &rs );
 883                 } else {
 884                         rs.sr_err = send_search_entry( op, &rs );
 885                 }
 886                 break;
 887         default:
 888                 assert(0);
 889         }
 890         /* In case someone else freed it already? */
 891         if ( rs.sr_ctrls ) {
 892                 int i;
 893                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 894                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 895                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 896                                 ctrls[0]->ldctl_value.bv_val = NULL;
 897                                 break;
 898                         }
 899                 }
 900                 rs.sr_ctrls = NULL;
 901         }
 902
 903         return rs.sr_err;
 904 }
 905
 906 static void
 907 syncprov_qstart( syncops *so );
 908
 909 /* Play back queued responses */
 910 static int
 911 syncprov_qplay( Operation *op, syncops *so )
 912 {
 913         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 914         syncres *sr;
 915         Entry *e;
 916         opcookie opc;
 917         int rc = 0;
 918
 919         opc.son = on;
 920
 921         do {
 922                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 923                 sr = so->s_res;
 924                 if ( sr )
 925                         so->s_res = sr->s_next;
 926                 if ( !so->s_res )
 927                         so->s_restail = NULL;
 928                 /* Exit loop with mutex held */
 929                 if ( !sr || so->s_op->o_abandon )
 930                         break;
 931                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 932
 933                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 934                         SlapReply rs = { REP_INTERMEDIATE };
 935
 936                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 937                                 &sr->s_csn, 0, NULL, 0 );
 938                 } else {
 939                         opc.sdn = sr->s_dn;
 940                         opc.sndn = sr->s_ndn;
 941                         opc.suuid = sr->s_uuid;
 942                         opc.sctxcsn = sr->s_csn;
 943                         opc.sreference = sr->s_isreference;
 944                         opc.se = sr->s_e;
 945
 946                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 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
 956                 ch_free( sr );
 957
 958                 /* Exit loop with mutex held */
 959                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 960
 961         } while (0);
 962
 963         /* We now only send one change at a time, to prevent one
 964          * psearch from hogging all the CPU. Resubmit this task if
 965          * there are more responses queued and no errors occurred.
 966          */
 967
 968         if ( rc == 0 && so->s_res ) {
 969                 syncprov_qstart( so );
 970         } else {
 971                 so->s_flags ^= PS_TASK_QUEUED;
 972         }
 973
 974         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 975         return rc;
 976 }
 977
 978 /* task for playing back queued responses */
 979 static void *
 980 syncprov_qtask( void *ctx, void *arg )
 981 {
 982         syncops *so = arg;
 983         OperationBuffer opbuf;
 984         Operation *op;
 985         BackendDB be;
 986         int rc;
 987
 988         op = &opbuf.ob_op;
 989         *op = *so->s_op;
 990         op->o_hdr = &opbuf.ob_hdr;
 991         op->o_controls = opbuf.ob_controls;
 992         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 993
 994         *op->o_hdr = *so->s_op->o_hdr;
 995
 996         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 997         op->o_tmpmfuncs = &slap_sl_mfuncs;
 998         op->o_threadctx = ctx;
 999
1000         /* syncprov_qplay expects a fake db */
1001         be = *so->s_op->o_bd;
1002         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1003         op->o_bd = &be;
1004         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1005         op->o_callback = NULL;
1006
1007         rc = syncprov_qplay( op, so );
1008
1009         /* decrement use count... */
1010         syncprov_free_syncop( so );
1011
1012         return NULL;
1013 }
1014
1015 /* Start the task to play back queued psearch responses */
1016 static void
1017 syncprov_qstart( syncops *so )
1018 {
1019         so->s_flags |= PS_TASK_QUEUED;
1020         so->s_inuse++;
1021         ldap_pvt_thread_pool_submit( &connection_pool,
1022                 syncprov_qtask, so );
1023 }
1024
1025 /* Queue a persistent search response */
1026 static int
1027 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1028 {
1029         syncres *sr;
1030         int srsize;
1031         struct berval cookie = opc->sctxcsn;
1032
1033         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1034                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1035
1036                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1037                         so->s_rid, slap_serverID ? slap_serverID : -1);
1038         }
1039
1040         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1041                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1042         if ( cookie.bv_len )
1043                 srsize += cookie.bv_len + 1;
1044         sr = ch_malloc( srsize );
1045         sr->s_next = NULL;
1046         sr->s_e = opc->se;
1047         /* bump refcount on this entry */
1048         if ( opc->se )
1049                 inc_mutexint( opc->se->e_private );
1050         sr->s_dn.bv_val = (char *)(sr + 1);
1051         sr->s_dn.bv_len = opc->sdn.bv_len;
1052         sr->s_mode = mode;
1053         sr->s_isreference = opc->sreference;
1054         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1055                  opc->sdn.bv_val ) + 1;
1056         sr->s_ndn.bv_len = opc->sndn.bv_len;
1057         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1058                  opc->sndn.bv_val ) + 1;
1059         sr->s_uuid.bv_len = opc->suuid.bv_len;
1060         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1061         if ( cookie.bv_len ) {
1062                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1063                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1064         } else {
1065                 sr->s_csn.bv_val = NULL;
1066         }
1067         sr->s_csn.bv_len = cookie.bv_len;
1068
1069         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1070                 ch_free( cookie.bv_val );
1071         }
1072
1073         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1074         if ( !so->s_res ) {
1075                 so->s_res = sr;
1076         } else {
1077                 so->s_restail->s_next = sr;
1078         }
1079         so->s_restail = sr;
1080
1081         /* If the base of the psearch was modified, check it next time round */
1082         if ( so->s_flags & PS_WROTE_BASE ) {
1083                 so->s_flags ^= PS_WROTE_BASE;
1084                 so->s_flags |= PS_FIND_BASE;
1085         }
1086         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1087                 syncprov_qstart( so );
1088         }
1089         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1090         return LDAP_SUCCESS;
1091 }
1092
1093 static int
1094 syncprov_drop_psearch( syncops *so, int lock )
1095 {
1096         if ( so->s_flags & PS_IS_DETACHED ) {
1097                 if ( lock )
1098                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1099                 so->s_op->o_conn->c_n_ops_executing--;
1100                 so->s_op->o_conn->c_n_ops_completed++;
1101                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1102                         o_next );
1103                 if ( lock )
1104                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1105         }
1106         syncprov_free_syncop( so );
1107
1108         return 0;
1109 }
1110
1111 static int
1112 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1113 {
1114         slap_callback *sc = op->o_callback;
1115         op->o_callback = sc->sc_next;
1116         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1117         op->o_tmpfree( sc, op->o_tmpmemctx );
1118         return 0;
1119 }
1120
1121 static int
1122 syncprov_op_abandon( Operation *op, SlapReply *rs )
1123 {
1124         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1125         syncprov_info_t         *si = on->on_bi.bi_private;
1126         syncops *so, *soprev;
1127
1128         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1129         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1130                 soprev=so, so=so->s_next ) {
1131                 if ( so->s_op->o_connid == op->o_connid &&
1132                         so->s_op->o_msgid == op->orn_msgid ) {
1133                                 so->s_op->o_abandon = 1;
1134                                 soprev->s_next = so->s_next;
1135                                 break;
1136                 }
1137         }
1138         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1139         if ( so ) {
1140                 /* Is this really a Cancel exop? */
1141                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1142                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1143                         rs->sr_err = LDAP_CANCELLED;
1144                         send_ldap_result( so->s_op, rs );
1145                         if ( so->s_flags & PS_IS_DETACHED ) {
1146                                 slap_callback *cb;
1147                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1148                                 cb->sc_cleanup = syncprov_ab_cleanup;
1149                                 cb->sc_next = op->o_callback;
1150                                 cb->sc_private = so;
1151                                 return SLAP_CB_CONTINUE;
1152                         }
1153                 }
1154                 syncprov_drop_psearch( so, 0 );
1155         }
1156         return SLAP_CB_CONTINUE;
1157 }
1158
1159 /* Find which persistent searches are affected by this operation */
1160 static void
1161 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1162 {
1163         slap_overinst *on = opc->son;
1164         syncprov_info_t         *si = on->on_bi.bi_private;
1165
1166         fbase_cookie fc;
1167         syncops *ss, *sprev, *snext;
1168         Entry *e = NULL;
1169         Attribute *a;
1170         int rc;
1171         struct berval newdn;
1172         int freefdn = 0;
1173         BackendDB *b0 = op->o_bd, db;
1174
1175         fc.fdn = &op->o_req_ndn;
1176         /* compute new DN */
1177         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1178                 struct berval pdn;
1179                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1180                 else dnParent( fc.fdn, &pdn );
1181                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1182                 fc.fdn = &newdn;
1183                 freefdn = 1;
1184         }
1185         if ( op->o_tag != LDAP_REQ_ADD ) {
1186                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1187                         db = *op->o_bd;
1188                         op->o_bd = &db;
1189                 }
1190                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1191                 /* If we're sending responses now, make a copy and unlock the DB */
1192                 if ( e && !saveit ) {
1193                         if ( !opc->se ) {
1194                                 opc->se = entry_dup( e );
1195                                 opc->se->e_private = get_mutexint();
1196                         }
1197                         overlay_entry_release_ov( op, e, 0, on );
1198                         e = opc->se;
1199                 }
1200                 if ( rc ) {
1201                         op->o_bd = b0;
1202                         return;
1203                 }
1204         } else {
1205                 e = op->ora_e;
1206                 if ( !saveit ) {
1207                         if ( !opc->se ) {
1208                                 opc->se = entry_dup( e );
1209                                 opc->se->e_private = get_mutexint();
1210                         }
1211                         e = opc->se;
1212                 }
1213         }
1214
1215         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1216                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1217                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1218                 opc->sreference = is_entry_referral( e );
1219                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1220                 if ( a )
1221                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1222         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1223                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1224                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1225                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1226                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1227         }
1228
1229         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1230         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1231                 sprev = ss, ss=snext)
1232         {
1233                 Operation op2;
1234                 Opheader oh;
1235                 syncmatches *sm;
1236                 int found = 0;
1237
1238                 snext = ss->s_next;
1239                 if ( ss->s_op->o_abandon )
1240                         continue;
1241
1242                 /* Don't send ops back to the originator */
1243                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1244                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1245                                 opc->osid, 0, 0 );
1246                         continue;
1247                 }
1248
1249                 /* Don't send ops back to the messenger */
1250                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1251                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1252                                 opc->rsid, 0, 0 );
1253                         continue;
1254                 }
1255
1256                 /* validate base */
1257                 fc.fss = ss;
1258                 fc.fbase = 0;
1259                 fc.fscope = 0;
1260
1261                 /* If the base of the search is missing, signal a refresh */
1262                 rc = syncprov_findbase( op, &fc );
1263                 if ( rc != LDAP_SUCCESS ) {
1264                         SlapReply rs = {REP_RESULT};
1265                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1266                                 "search base has changed" );
1267                         sprev->s_next = snext;
1268                         syncprov_drop_psearch( ss, 1 );
1269                         ss = sprev;
1270                         continue;
1271                 }
1272
1273                 /* If we're sending results now, look for this op in old matches */
1274                 if ( !saveit ) {
1275                         syncmatches *old;
1276
1277                         /* Did we modify the search base? */
1278                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1279                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1280                                 ss->s_flags |= PS_WROTE_BASE;
1281                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1282                         }
1283
1284                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1285                                 old=sm, sm=sm->sm_next ) {
1286                                 if ( sm->sm_op == ss ) {
1287                                         found = 1;
1288                                         old->sm_next = sm->sm_next;
1289                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1290                                         break;
1291                                 }
1292                         }
1293                 }
1294
1295                 if ( fc.fscope ) {
1296                         op2 = *ss->s_op;
1297                         oh = *op->o_hdr;
1298                         oh.oh_conn = ss->s_op->o_conn;
1299                         oh.oh_connid = ss->s_op->o_connid;
1300                         op2.o_bd = op->o_bd->bd_self;
1301                         op2.o_hdr = &oh;
1302                         op2.o_extra = op->o_extra;
1303                         op2.o_callback = NULL;
1304                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1305                 }
1306
1307                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1308                         ss->s_sid, fc.fscope, rc );
1309
1310                 /* check if current o_req_dn is in scope and matches filter */
1311                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1312                         if ( saveit ) {
1313                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1314                                 sm->sm_next = opc->smatches;
1315                                 sm->sm_op = ss;
1316                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1317                                 ++ss->s_inuse;
1318                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1319                                 opc->smatches = sm;
1320                         } else {
1321                                 /* if found send UPDATE else send ADD */
1322                                 syncprov_qresp( opc, ss,
1323                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1324                         }
1325                 } else if ( !saveit && found ) {
1326                         /* send DELETE */
1327                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1328                 } else if ( !saveit ) {
1329                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1330                 }
1331                 if ( !saveit && found ) {
1332                         /* Decrement s_inuse, was incremented when called
1333                          * with saveit == TRUE
1334                          */
1335                         syncprov_free_syncop( ss );
1336                 }
1337         }
1338         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1339
1340         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1341                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1342                         op->o_bd = &db;
1343                 }
1344                 if ( saveit )
1345                         overlay_entry_release_ov( op, e, 0, on );
1346                 op->o_bd = b0;
1347         }
1348         if ( opc->se && !saveit ) {
1349                 if ( !dec_mutexint( opc->se->e_private )) {
1350                         opc->se->e_private = NULL;
1351                         entry_free( opc->se );
1352                         opc->se = NULL;
1353                 }
1354         }
1355         if ( freefdn ) {
1356                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1357         }
1358         op->o_bd = b0;
1359 }
1360
1361 static int
1362 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1363 {
1364         slap_callback *cb = op->o_callback;
1365         opcookie *opc = cb->sc_private;
1366         slap_overinst *on = opc->son;
1367         syncprov_info_t         *si = on->on_bi.bi_private;
1368         syncmatches *sm, *snext;
1369         modtarget *mt, mtdummy;
1370
1371         for (sm = opc->smatches; sm; sm=snext) {
1372                 snext = sm->sm_next;
1373                 syncprov_free_syncop( sm->sm_op );
1374                 op->o_tmpfree( sm, op->o_tmpmemctx );
1375         }
1376
1377         /* Remove op from lock table */
1378         mt = opc->smt;
1379         if ( mt ) {
1380                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1381                 mt->mt_mods = mt->mt_mods->mi_next;
1382                 /* If there are more, promote the next one */
1383                 if ( mt->mt_mods ) {
1384                         mt->mt_op = mt->mt_mods->mi_op;
1385                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1386                 } else {
1387                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1388                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1389                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1390                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1391                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1392                         ch_free( mt );
1393                 }
1394         }
1395         if ( !BER_BVISNULL( &opc->suuid ))
1396                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1397         if ( !BER_BVISNULL( &opc->sndn ))
1398                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1399         if ( !BER_BVISNULL( &opc->sdn ))
1400                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1401         op->o_callback = cb->sc_next;
1402         op->o_tmpfree(cb, op->o_tmpmemctx);
1403
1404         return 0;
1405 }
1406
1407 static void
1408 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1409 {
1410         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1411         Modifications mod;
1412         Operation opm;
1413         SlapReply rsm = { 0 };
1414         slap_callback cb = {0};
1415         BackendDB be;
1416
1417 #ifdef CHECK_CSN
1418         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1419
1420         int i;
1421         for ( i=0; i<si->si_numcsns; i++ ) {
1422                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1423         }
1424 #endif
1425         mod.sml_numvals = si->si_numcsns;
1426         mod.sml_values = si->si_ctxcsn;
1427         mod.sml_nvalues = NULL;
1428         mod.sml_desc = slap_schema.si_ad_contextCSN;
1429         mod.sml_op = LDAP_MOD_REPLACE;
1430         mod.sml_flags = SLAP_MOD_INTERNAL;
1431         mod.sml_next = NULL;
1432
1433         cb.sc_response = slap_null_cb;
1434         opm = *op;
1435         opm.o_tag = LDAP_REQ_MODIFY;
1436         opm.o_callback = &cb;
1437         opm.orm_modlist = &mod;
1438         opm.orm_no_opattrs = 1;
1439         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1440                 be = *on->on_info->oi_origdb;
1441                 opm.o_bd = &be;
1442         }
1443         opm.o_req_dn = si->si_contextdn;
1444         opm.o_req_ndn = si->si_contextdn;
1445         opm.o_bd->bd_info = on->on_info->oi_orig;
1446         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1447         opm.o_no_schema_check = 1;
1448         opm.o_bd->be_modify( &opm, &rsm );
1449
1450         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1451                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1452                 const char      *text;
1453                 char txtbuf[SLAP_TEXT_BUFLEN];
1454                 size_t textlen = sizeof txtbuf;
1455                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1456                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1457                 opm.ora_e = e;
1458                 opm.o_bd->be_add( &opm, &rsm );
1459                 if ( e == opm.ora_e )
1460                         be_entry_release_w( &opm, opm.ora_e );
1461         }
1462
1463         if ( mod.sml_next != NULL ) {
1464                 slap_mods_free( mod.sml_next, 1 );
1465         }
1466 #ifdef CHECK_CSN
1467         for ( i=0; i<si->si_numcsns; i++ ) {
1468                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1469         }
1470 #endif
1471 }
1472
1473 static void
1474 syncprov_add_slog( Operation *op )
1475 {
1476         opcookie *opc = op->o_callback->sc_private;
1477         slap_overinst *on = opc->son;
1478         syncprov_info_t         *si = on->on_bi.bi_private;
1479         sessionlog *sl;
1480         slog_entry *se;
1481
1482         sl = si->si_logs;
1483         {
1484                 /* Allocate a record. UUIDs are not NUL-terminated. */
1485                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1486                         op->o_csn.bv_len + 1 );
1487                 se->se_next = NULL;
1488                 se->se_tag = op->o_tag;
1489
1490                 se->se_uuid.bv_val = (char *)(&se[1]);
1491                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1492                 se->se_uuid.bv_len = opc->suuid.bv_len;
1493
1494                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1495                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1496                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1497                 se->se_csn.bv_len = op->o_csn.bv_len;
1498                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1499
1500                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1501                 if ( sl->sl_head ) {
1502                         sl->sl_tail->se_next = se;
1503                 } else {
1504                         sl->sl_head = se;
1505                 }
1506                 sl->sl_tail = se;
1507                 sl->sl_num++;
1508                 while ( sl->sl_num > sl->sl_size ) {
1509                         se = sl->sl_head;
1510                         sl->sl_head = se->se_next;
1511                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1512                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1513                         ch_free( se );
1514                         sl->sl_num--;
1515                 }
1516                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1517         }
1518 }
1519
1520 /* Just set a flag if we found the matching entry */
1521 static int
1522 playlog_cb( Operation *op, SlapReply *rs )
1523 {
1524         if ( rs->sr_type == REP_SEARCH ) {
1525                 op->o_callback->sc_private = (void *)1;
1526         }
1527         return rs->sr_err;
1528 }
1529
1530 /* enter with sl->sl_mutex locked, release before returning */
1531 static void
1532 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1533         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1534 {
1535         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1536         slog_entry *se;
1537         int i, j, ndel, num, nmods, mmods;
1538         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1539         BerVarray uuids;
1540         struct berval delcsn[2];
1541
1542         if ( !sl->sl_num ) {
1543                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1544                 return;
1545         }
1546
1547         num = sl->sl_num;
1548         i = 0;
1549         nmods = 0;
1550
1551         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1552                 num * UUID_LEN, op->o_tmpmemctx );
1553         uuids[0].bv_val = (char *)(uuids + num + 1);
1554
1555         delcsn[0].bv_len = 0;
1556         delcsn[0].bv_val = cbuf;
1557         BER_BVZERO(&delcsn[1]);
1558
1559         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1560          * and everything else at the end. Do this first so we can
1561          * unlock the list mutex.
1562          */
1563         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1564                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1565         for ( se=sl->sl_head; se; se=se->se_next ) {
1566                 int k;
1567                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1568                 ndel = 1;
1569                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1570                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1571                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1572                                 break;
1573                         }
1574                 }
1575                 if ( ndel <= 0 ) {
1576                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1577                         continue;
1578                 }
1579                 ndel = 0;
1580                 for ( k=0; k<numcsns; k++ ) {
1581                         if ( se->se_sid == sids[k] ) {
1582                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1583                                 break;
1584                         }
1585                 }
1586                 if ( ndel > 0 ) {
1587                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1588                         break;
1589                 }
1590                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1591                         j = i;
1592                         i++;
1593                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1594                         delcsn[0].bv_len = se->se_csn.bv_len;
1595                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1596                 } else {
1597                         nmods++;
1598                         j = num - nmods;
1599                 }
1600                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1601                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1602                 uuids[j].bv_len = UUID_LEN;
1603         }
1604         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1605
1606         ndel = i;
1607
1608         /* Zero out unused slots */
1609         for ( i=ndel; i < num - nmods; i++ )
1610                 uuids[i].bv_len = 0;
1611
1612         /* Mods must be validated to see if they belong in this delete set.
1613          */
1614
1615         mmods = nmods;
1616         /* Strip any duplicates */
1617         for ( i=0; i<nmods; i++ ) {
1618                 for ( j=0; j<ndel; j++ ) {
1619                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1620                                 uuids[num - 1 - i].bv_len = 0;
1621                                 mmods --;
1622                                 break;
1623                         }
1624                 }
1625                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1626                 for ( j=0; j<i; j++ ) {
1627                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1628                                 uuids[num - 1 - i].bv_len = 0;
1629                                 mmods --;
1630                                 break;
1631                         }
1632                 }
1633         }
1634
1635         if ( mmods ) {
1636                 Operation fop;
1637                 SlapReply frs = { REP_RESULT };
1638                 int rc;
1639                 Filter mf, af;
1640                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1641                 slap_callback cb = {0};
1642
1643                 fop = *op;
1644
1645                 fop.o_sync_mode = 0;
1646                 fop.o_callback = &cb;
1647                 fop.ors_limit = NULL;
1648                 fop.ors_tlimit = SLAP_NO_LIMIT;
1649                 fop.ors_attrs = slap_anlist_all_attributes;
1650                 fop.ors_attrsonly = 0;
1651                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1652
1653                 af.f_choice = LDAP_FILTER_AND;
1654                 af.f_next = NULL;
1655                 af.f_and = &mf;
1656                 mf.f_choice = LDAP_FILTER_EQUALITY;
1657                 mf.f_ava = &eq;
1658                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1659                 mf.f_next = fop.ors_filter;
1660
1661                 fop.ors_filter = &af;
1662
1663                 cb.sc_response = playlog_cb;
1664                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1665
1666                 for ( i=ndel; i<num; i++ ) {
1667                         if ( uuids[i].bv_len == 0 ) continue;
1668
1669                         mf.f_av_value = uuids[i];
1670                         cb.sc_private = NULL;
1671                         fop.ors_slimit = 1;
1672                         frs.sr_nentries = 0;
1673                         rc = fop.o_bd->be_search( &fop, &frs );
1674
1675                         /* If entry was not found, add to delete list */
1676                         if ( !cb.sc_private ) {
1677                                 uuids[ndel++] = uuids[i];
1678                         }
1679                 }
1680                 fop.o_bd->bd_info = (BackendInfo *)on;
1681         }
1682         if ( ndel ) {
1683                 struct berval cookie;
1684
1685                 if ( delcsn[0].bv_len ) {
1686                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1687                                 slap_serverID ? slap_serverID : -1 );
1688
1689                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1690                 }
1691
1692                 uuids[ndel].bv_val = NULL;
1693                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1694                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1695                 if ( delcsn[0].bv_len ) {
1696                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1697                 }
1698         }
1699         op->o_tmpfree( uuids, op->o_tmpmemctx );
1700 }
1701
1702 static int
1703 syncprov_op_response( Operation *op, SlapReply *rs )
1704 {
1705         opcookie *opc = op->o_callback->sc_private;
1706         slap_overinst *on = opc->son;
1707         syncprov_info_t         *si = on->on_bi.bi_private;
1708         syncmatches *sm;
1709
1710         if ( rs->sr_err == LDAP_SUCCESS )
1711         {
1712                 struct berval maxcsn;
1713                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1714                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1715
1716                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1717
1718                 /* Update our context CSN */
1719                 cbuf[0] = '\0';
1720                 maxcsn.bv_val = cbuf;
1721                 maxcsn.bv_len = sizeof(cbuf);
1722                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1723
1724                 slap_get_commit_csn( op, &maxcsn, &foundit );
1725                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1726                         /* syncrepl queues the CSN values in the db where
1727                          * it is configured , not where the changes are made.
1728                          * So look for a value in the glue db if we didn't
1729                          * find any in this db.
1730                          */
1731                         BackendDB *be = op->o_bd;
1732                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1733                         maxcsn.bv_val = cbuf;
1734                         maxcsn.bv_len = sizeof(cbuf);
1735                         slap_get_commit_csn( op, &maxcsn, &foundit );
1736                         op->o_bd = be;
1737                 }
1738                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1739                         int i, sid;
1740 #ifdef CHECK_CSN
1741                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1742                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1743 #endif
1744                         sid = slap_parse_csn_sid( &maxcsn );
1745                         for ( i=0; i<si->si_numcsns; i++ ) {
1746                                 if ( sid == si->si_sids[i] ) {
1747                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1748                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1749                                                 csn_changed = 1;
1750                                         }
1751                                         break;
1752                                 }
1753                         }
1754                         /* It's a new SID for us */
1755                         if ( i == si->si_numcsns ) {
1756                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1757                                 csn_changed = 1;
1758                                 si->si_numcsns++;
1759                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1760                                         sizeof(int));
1761                                 si->si_sids[i] = sid;
1762                         }
1763                 }
1764
1765                 /* Don't do any processing for consumer contextCSN updates */
1766                 if ( op->o_dont_replicate ) {
1767                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1768                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1769                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1770                         /* Catch contextCSN updates from syncrepl. We have to look at
1771                          * all the attribute values, as there may be more than one csn
1772                          * that changed, and only one can be passed in the csn queue.
1773                          */
1774                         Modifications *mod = op->orm_modlist;
1775                         int i, j, sid;
1776
1777                         for ( i=0; i<mod->sml_numvals; i++ ) {
1778                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1779                                 for ( j=0; j<si->si_numcsns; j++ ) {
1780                                         if ( sid == si->si_sids[j] ) {
1781                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1782                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1783                                                         csn_changed = 1;
1784                                                 }
1785                                                 break;
1786                                         }
1787                                 }
1788
1789                                 if ( j == si->si_numcsns ) {
1790                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1791                                         si->si_numcsns++;
1792                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1793                                                 sizeof(int));
1794                                         si->si_sids[j] = sid;
1795                                         csn_changed = 1;
1796                                 }
1797                         }
1798                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1799
1800                         if ( csn_changed ) {
1801                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1802                                 have_psearches = ( si->si_ops != NULL );
1803                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1804
1805                                 if ( have_psearches ) {
1806                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1807                                                 if ( sm->sm_op->s_op->o_abandon )
1808                                                         continue;
1809                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1810                                         }
1811                                 }
1812                         }
1813                         } else {
1814                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1815                         }
1816                         goto leave;
1817                 }
1818
1819                 si->si_numops++;
1820                 if ( si->si_chkops || si->si_chktime ) {
1821                         /* Never checkpoint adding the context entry,
1822                          * it will deadlock
1823                          */
1824                         if ( op->o_tag != LDAP_REQ_ADD ||
1825                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1826                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1827                                         do_check = 1;
1828                                         si->si_numops = 0;
1829                                 }
1830                                 if ( si->si_chktime &&
1831                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1832                                         if ( si->si_chklast ) {
1833                                                 do_check = 1;
1834                                                 si->si_chklast = op->o_time;
1835                                         } else {
1836                                                 si->si_chklast = 1;
1837                                         }
1838                                 }
1839                         }
1840                 }
1841                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1842
1843                 if ( do_check ) {
1844                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1845                         syncprov_checkpoint( op, rs, on );
1846                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1847                 }
1848
1849                 /* only update consumer ctx if this is a newer csn */
1850                 if ( csn_changed ) {
1851                         opc->sctxcsn = maxcsn;
1852                 }
1853
1854                 /* Handle any persistent searches */
1855                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1856                 have_psearches = ( si->si_ops != NULL );
1857                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1858                 if ( have_psearches ) {
1859                         switch(op->o_tag) {
1860                         case LDAP_REQ_ADD:
1861                         case LDAP_REQ_MODIFY:
1862                         case LDAP_REQ_MODRDN:
1863                         case LDAP_REQ_EXTENDED:
1864                                 syncprov_matchops( op, opc, 0 );
1865                                 break;
1866                         case LDAP_REQ_DELETE:
1867                                 /* for each match in opc->smatches:
1868                                  *   send DELETE msg
1869                                  */
1870                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1871                                         if ( sm->sm_op->s_op->o_abandon )
1872                                                 continue;
1873                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1874                                 }
1875                                 break;
1876                         }
1877                 }
1878
1879                 /* Add any log records */
1880                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1881                         syncprov_add_slog( op );
1882                 }
1883 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1884         }
1885         return SLAP_CB_CONTINUE;
1886 }
1887
1888 /* We don't use a subentry to store the context CSN any more.
1889  * We expose the current context CSN as an operational attribute
1890  * of the suffix entry.
1891  */
1892 static int
1893 syncprov_op_compare( Operation *op, SlapReply *rs )
1894 {
1895         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1896         syncprov_info_t         *si = on->on_bi.bi_private;
1897         int rc = SLAP_CB_CONTINUE;
1898
1899         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1900                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1901         {
1902                 Entry e = {0};
1903                 Attribute a = {0};
1904
1905                 e.e_name = si->si_contextdn;
1906                 e.e_nname = si->si_contextdn;
1907                 e.e_attrs = &a;
1908
1909                 a.a_desc = slap_schema.si_ad_contextCSN;
1910
1911                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1912
1913                 a.a_vals = si->si_ctxcsn;
1914                 a.a_nvals = a.a_vals;
1915                 a.a_numvals = si->si_numcsns;
1916
1917                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1918                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1919                 if ( ! rs->sr_err ) {
1920                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1921                         goto return_results;
1922                 }
1923
1924                 if ( get_assert( op ) &&
1925                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1926                 {
1927                         rs->sr_err = LDAP_ASSERTION_FAILED;
1928                         goto return_results;
1929                 }
1930
1931
1932                 rs->sr_err = LDAP_COMPARE_FALSE;
1933
1934                 if ( attr_valfind( &a,
1935                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1936                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1937                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1938                 {
1939                         rs->sr_err = LDAP_COMPARE_TRUE;
1940                 }
1941
1942 return_results:;
1943
1944                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1945
1946                 send_ldap_result( op, rs );
1947
1948                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1949                         rs->sr_err = LDAP_SUCCESS;
1950                 }
1951                 rc = rs->sr_err;
1952         }
1953
1954         return rc;
1955 }
1956
1957 static int
1958 syncprov_op_mod( Operation *op, SlapReply *rs )
1959 {
1960         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1961         syncprov_info_t         *si = on->on_bi.bi_private;
1962         slap_callback *cb;
1963         opcookie *opc;
1964         int have_psearches, cbsize;
1965
1966         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1967         have_psearches = ( si->si_ops != NULL );
1968         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1969
1970         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1971                 (have_psearches ? sizeof(modinst) : 0 );
1972
1973         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1974         opc = (opcookie *)(cb+1);
1975         opc->son = on;
1976         cb->sc_response = syncprov_op_response;
1977         cb->sc_cleanup = syncprov_op_cleanup;
1978         cb->sc_private = opc;
1979         cb->sc_next = op->o_callback;
1980         op->o_callback = cb;
1981
1982         opc->osid = -1;
1983         opc->rsid = -1;
1984         if ( op->o_csn.bv_val ) {
1985                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1986         }
1987         if ( op->o_controls ) {
1988                 struct sync_cookie *scook =
1989                 op->o_controls[slap_cids.sc_LDAPsync];
1990                 if ( scook )
1991                         opc->rsid = scook->sid;
1992         }
1993
1994         /* If there are active persistent searches, lock this operation.
1995          * See seqmod.c for the locking logic on its own.
1996          */
1997         if ( have_psearches ) {
1998                 modtarget *mt, mtdummy;
1999                 modinst *mi;
2000
2001                 mi = (modinst *)(opc+1);
2002                 mi->mi_op = op;
2003
2004                 /* See if we're already modifying this entry... */
2005                 mtdummy.mt_op = op;
2006                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2007                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2008                 if ( mt ) {
2009                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2010                         if ( mt->mt_mods == NULL ) {
2011                                 /* Cannot reuse this mt, as another thread is about
2012                                  * to release it in syncprov_op_cleanup.
2013                                  */
2014                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2015                                 mt = NULL;
2016                         }
2017                 }
2018                 if ( mt ) {
2019                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2020                         mt->mt_tail->mi_next = mi;
2021                         mt->mt_tail = mi;
2022                         /* wait for this op to get to head of list */
2023                         while ( mt->mt_mods != mi ) {
2024                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2025                                 /* FIXME: if dynamic config can delete overlays or
2026                                  * databases we'll have to check for cleanup here.
2027                                  * Currently it's not an issue because there are
2028                                  * no dynamic config deletes...
2029                                  */
2030                                 if ( slapd_shutdown )
2031                                         return SLAPD_ABANDON;
2032
2033                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2034                                         ldap_pvt_thread_yield();
2035                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2036
2037                                 /* clean up if the caller is giving up */
2038                                 if ( op->o_abandon ) {
2039                                         modinst *m2;
2040                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2041                                                 m2 = m2->mi_next );
2042                                         m2->mi_next = mi->mi_next;
2043                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2044                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2045                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2046                                         return SLAPD_ABANDON;
2047                                 }
2048                         }
2049                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2050                 } else {
2051                         /* Record that we're modifying this entry now */
2052                         mt = ch_malloc( sizeof(modtarget) );
2053                         mt->mt_mods = mi;
2054                         mt->mt_tail = mi;
2055                         mt->mt_op = mi->mi_op;
2056                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2057                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2058                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2059                 }
2060                 opc->smt = mt;
2061         }
2062
2063         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2064                 syncprov_matchops( op, opc, 1 );
2065
2066         return SLAP_CB_CONTINUE;
2067 }
2068
2069 static int
2070 syncprov_op_extended( Operation *op, SlapReply *rs )
2071 {
2072         if ( exop_is_write( op ))
2073                 return syncprov_op_mod( op, rs );
2074
2075         return SLAP_CB_CONTINUE;
2076 }
2077
2078 typedef struct searchstate {
2079         slap_overinst *ss_on;
2080         syncops *ss_so;
2081         BerVarray ss_ctxcsn;
2082         int *ss_sids;
2083         int ss_numcsns;
2084 #define SS_PRESENT      0x01
2085 #define SS_CHANGED      0x02
2086         int ss_flags;
2087 } searchstate;
2088
2089 static int
2090 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2091 {
2092         if ( rs->sr_ctrls ) {
2093                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2094                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2095                 rs->sr_ctrls = NULL;
2096         }
2097         return 0;
2098 }
2099
2100 typedef struct SyncOperationBuffer {
2101         Operation               sob_op;
2102         Opheader                sob_hdr;
2103         OpExtra                 sob_oe;
2104         AttributeName   sob_extra;      /* not always present */
2105         /* Further data allocated here */
2106 } SyncOperationBuffer;
2107
2108 static void
2109 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2110 {
2111         SyncOperationBuffer *sopbuf2;
2112         Operation *op2;
2113         int i, alen = 0;
2114         size_t size;
2115         char *ptr;
2116         GroupAssertion *g1, *g2;
2117
2118         /* count the search attrs */
2119         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2120                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2121         }
2122         /* Make a new copy of the operation */
2123         size = offsetof( SyncOperationBuffer, sob_extra ) +
2124                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2125                 op->o_req_dn.bv_len + 1 +
2126                 op->o_req_ndn.bv_len + 1 +
2127                 op->o_ndn.bv_len + 1 +
2128                 so->s_filterstr.bv_len + 1;
2129         sopbuf2 = ch_calloc( 1, size );
2130         op2 = &sopbuf2->sob_op;
2131         op2->o_hdr = &sopbuf2->sob_hdr;
2132         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2133
2134         /* Copy the fields we care about explicitly, leave the rest alone */
2135         *op2->o_hdr = *op->o_hdr;
2136         op2->o_tag = op->o_tag;
2137         op2->o_time = op->o_time;
2138         op2->o_bd = on->on_info->oi_origdb;
2139         op2->o_request = op->o_request;
2140         op2->o_managedsait = op->o_managedsait;
2141         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2142         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2143
2144         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2145         if ( i ) {
2146                 op2->ors_attrs = (AttributeName *) ptr;
2147                 ptr = (char *) &op2->ors_attrs[i+1];
2148                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2149                         op2->ors_attrs[i] = op->ors_attrs[i];
2150                         op2->ors_attrs[i].an_name.bv_val = ptr;
2151                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2152                 }
2153                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2154         }
2155
2156         op2->o_authz = op->o_authz;
2157         op2->o_ndn.bv_val = ptr;
2158         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2159         op2->o_dn = op2->o_ndn;
2160         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2161         op2->o_req_dn.bv_val = ptr;
2162         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2163         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2164         op2->o_req_ndn.bv_val = ptr;
2165         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2166         op2->ors_filterstr.bv_val = ptr;
2167         strcpy( ptr, so->s_filterstr.bv_val );
2168         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2169
2170         /* Skip the AND/GE clause that we stuck on in front */
2171         if ( so->s_flags & PS_FIX_FILTER ) {
2172                 op2->ors_filter = op->ors_filter->f_and->f_next;
2173                 so->s_flags ^= PS_FIX_FILTER;
2174         } else {
2175                 op2->ors_filter = op->ors_filter;
2176         }
2177         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2178         so->s_op = op2;
2179
2180         /* Copy any cached group ACLs individually */
2181         op2->o_groups = NULL;
2182         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2183                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2184                 *g2 = *g1;
2185                 strcpy( g2->ga_ndn, g1->ga_ndn );
2186                 g2->ga_next = op2->o_groups;
2187                 op2->o_groups = g2;
2188         }
2189         /* Don't allow any further group caching */
2190         op2->o_do_not_cache = 1;
2191
2192         /* Add op2 to conn so abandon will find us */
2193         op->o_conn->c_n_ops_executing++;
2194         op->o_conn->c_n_ops_completed--;
2195         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2196         so->s_flags |= PS_IS_DETACHED;
2197
2198         /* Prevent anyone else from trying to send a result for this op */
2199         op->o_abandon = 1;
2200 }
2201
2202 static int
2203 syncprov_search_response( Operation *op, SlapReply *rs )
2204 {
2205         searchstate *ss = op->o_callback->sc_private;
2206         slap_overinst *on = ss->ss_on;
2207         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2208         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2209
2210         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2211                 Attribute *a;
2212                 /* If we got a referral without a referral object, there's
2213                  * something missing that we cannot replicate. Just ignore it.
2214                  * The consumer will abort because we didn't send the expected
2215                  * control.
2216                  */
2217                 if ( !rs->sr_entry ) {
2218                         assert( rs->sr_entry != NULL );
2219                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2220                         return SLAP_CB_CONTINUE;
2221                 }
2222                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2223                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2224                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2225                 }
2226                 if ( a ) {
2227                         int i, sid;
2228                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2229
2230                         /* Don't send changed entries back to the originator */
2231                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2232                                 Debug( LDAP_DEBUG_SYNC,
2233                                         "Entry %s changed by peer, ignored\n",
2234                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2235                                 return LDAP_SUCCESS;
2236                         }
2237
2238                         /* If not a persistent search */
2239                         if ( !ss->ss_so ) {
2240                                 /* Make sure entry is less than the snapshot'd contextCSN */
2241                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2242                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2243                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2244                                                 Debug( LDAP_DEBUG_SYNC,
2245                                                         "Entry %s CSN %s greater than snapshot %s\n",
2246                                                         rs->sr_entry->e_name.bv_val,
2247                                                         a->a_nvals[0].bv_val,
2248                                                         ss->ss_ctxcsn[i].bv_val );
2249                                                 return LDAP_SUCCESS;
2250                                         }
2251                                 }
2252                         }
2253
2254                         /* Don't send old entries twice */
2255                         if ( srs->sr_state.ctxcsn ) {
2256                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2257                                         if ( sid == srs->sr_state.sids[i] &&
2258                                                 ber_bvcmp( &a->a_nvals[0],
2259                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2260                                                 Debug( LDAP_DEBUG_SYNC,
2261                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2262                                                         rs->sr_entry->e_name.bv_val,
2263                                                         a->a_nvals[0].bv_val,
2264                                                         srs->sr_state.ctxcsn[i].bv_val );
2265                                                 return LDAP_SUCCESS;
2266                                         }
2267                                 }
2268                         }
2269                 }
2270                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2271                         op->o_tmpmemctx );
2272                 rs->sr_ctrls[1] = NULL;
2273                 /* If we're in delta-sync mode, always send a cookie */
2274                 if ( si->si_nopres && si->si_usehint && a ) {
2275                         struct berval cookie;
2276                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2277                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2278                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2279                 } else {
2280                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2281                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2282                 }
2283         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2284                 struct berval cookie = BER_BVNULL;
2285
2286                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2287                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2288                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2289                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2290
2291                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2292                 }
2293
2294                 /* Is this a regular refresh?
2295                  * Note: refresh never gets here if there were no changes
2296                  */
2297                 if ( !ss->ss_so ) {
2298                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2299                                 op->o_tmpmemctx );
2300                         rs->sr_ctrls[1] = NULL;
2301                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2302                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2303                                         LDAP_SYNC_REFRESH_DELETES );
2304                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2305                 } else {
2306                 /* It's RefreshAndPersist, transition to Persist phase */
2307                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2308                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2309                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2310                                 1, NULL, 0 );
2311                         if ( !BER_BVISNULL( &cookie ))
2312                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2313
2314                         /* Detach this Op from frontend control */
2315                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2316
2317                         /* But not if this connection was closed along the way */
2318                         if ( op->o_abandon ) {
2319                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2320                                 /* syncprov_ab_cleanup will free this syncop */
2321                                 return SLAPD_ABANDON;
2322
2323                         } else {
2324                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2325                                 /* Turn off the refreshing flag */
2326                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2327
2328                                 syncprov_detach_op( op, ss->ss_so, on );
2329
2330                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2331
2332                                 /* If there are queued responses, fire them off */
2333                                 if ( ss->ss_so->s_res )
2334                                         syncprov_qstart( ss->ss_so );
2335                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2336                         }
2337
2338                         return LDAP_SUCCESS;
2339                 }
2340         }
2341
2342         return SLAP_CB_CONTINUE;
2343 }
2344
2345 static int
2346 syncprov_op_search( Operation *op, SlapReply *rs )
2347 {
2348         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2349         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2350         slap_callback   *cb;
2351         int gotstate = 0, changed = 0, do_present = 0;
2352         syncops *sop = NULL;
2353         searchstate *ss;
2354         sync_control *srs;
2355         BerVarray ctxcsn;
2356         int i, *sids, numcsns;
2357         struct berval mincsn;
2358
2359         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2360
2361         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2362                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2363                 return rs->sr_err;
2364         }
2365
2366         srs = op->o_controls[slap_cids.sc_LDAPsync];
2367
2368         /* If this is a persistent search, set it up right away */
2369         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2370                 syncops so = {0};
2371                 fbase_cookie fc;
2372                 opcookie opc;
2373                 slap_callback sc;
2374
2375                 fc.fss = &so;
2376                 fc.fbase = 0;
2377                 so.s_eid = NOID;
2378                 so.s_op = op;
2379                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2380                 /* syncprov_findbase expects to be called as a callback... */
2381                 sc.sc_private = &opc;
2382                 opc.son = on;
2383                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2384                 cb = op->o_callback;
2385                 op->o_callback = &sc;
2386                 rs->sr_err = syncprov_findbase( op, &fc );
2387                 op->o_callback = cb;
2388                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2389
2390                 if ( rs->sr_err != LDAP_SUCCESS ) {
2391                         send_ldap_result( op, rs );
2392                         return rs->sr_err;
2393                 }
2394                 sop = ch_malloc( sizeof( syncops ));
2395                 *sop = so;
2396                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2397                 sop->s_rid = srs->sr_state.rid;
2398                 sop->s_sid = srs->sr_state.sid;
2399                 sop->s_inuse = 1;
2400
2401                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2402                 sop->s_next = si->si_ops;
2403                 si->si_ops = sop;
2404                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2405         }
2406
2407         /* snapshot the ctxcsn */
2408         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2409         numcsns = si->si_numcsns;
2410         if ( numcsns ) {
2411                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2412                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2413                 for ( i=0; i<numcsns; i++ )
2414                         sids[i] = si->si_sids[i];
2415         } else {
2416                 ctxcsn = NULL;
2417                 sids = NULL;
2418         }
2419         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2420
2421         /* If we have a cookie, handle the PRESENT lookups */
2422         if ( srs->sr_state.ctxcsn ) {
2423                 sessionlog *sl;
2424                 int i, j;
2425
2426                 /* If we don't have any CSN of our own yet, pretend nothing
2427                  * has changed.
2428                  */
2429                 if ( !numcsns )
2430                         goto no_change;
2431
2432                 if ( !si->si_nopres )
2433                         do_present = SS_PRESENT;
2434
2435                 /* If there are SIDs we don't recognize in the cookie, drop them */
2436                 for (i=0; i<srs->sr_state.numcsns; ) {
2437                         for (j=0; j<numcsns; j++) {
2438                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2439                                         break;
2440                                 }
2441                         }
2442                         /* not found */
2443                         if ( j == numcsns ) {
2444                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2445                                 j = srs->sr_state.numcsns - 1;
2446                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2447                                 tmp.bv_len = 0;
2448                                 srs->sr_state.ctxcsn[j] = tmp;
2449                                 srs->sr_state.numcsns = j;
2450                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2451                                 continue;
2452                         }
2453                         i++;
2454                 }
2455
2456                 /* Find the smallest CSN */
2457                 mincsn = srs->sr_state.ctxcsn[0];
2458                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2459                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2460                                 mincsn = srs->sr_state.ctxcsn[i];
2461                 }
2462
2463                 /* If nothing has changed, shortcut it */
2464                 if ( srs->sr_state.numcsns == numcsns ) {
2465                         int i, j, newer;
2466                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2467                                 for ( j=0; j<numcsns; j++ ) {
2468                                         if ( srs->sr_state.sids[i] != sids[j] )
2469                                                 continue;
2470                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2471                                         /* If our state is newer, tell consumer about changes */
2472                                         if ( newer < 0 )
2473                                                 changed = SS_CHANGED;
2474                                         else if ( newer > 0 ) {
2475                                         /* our state is older, tell consumer nothing */
2476                                                 rs->sr_err = LDAP_SUCCESS;
2477 bailout:
2478                                                 if ( sop ) {
2479                                                         syncops **sp = &si->si_ops;
2480
2481                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2482                                                         while ( *sp != sop )
2483                                                                 sp = &(*sp)->s_next;
2484                                                         *sp = sop->s_next;
2485                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2486                                                         ch_free( sop );
2487                                                 }
2488                                                 rs->sr_ctrls = NULL;
2489                                                 send_ldap_result( op, rs );
2490                                                 return rs->sr_err;
2491                                         }
2492                                         break;
2493                                 }
2494                                 if ( changed )
2495                                         break;
2496                         }
2497                         if ( !changed ) {
2498                                 do_present = 0;
2499 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2500                                         LDAPControl     *ctrls[2];
2501
2502                                         ctrls[0] = NULL;
2503                                         ctrls[1] = NULL;
2504                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2505                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2506                                         rs->sr_ctrls = ctrls;
2507                                         rs->sr_err = LDAP_SUCCESS;
2508                                         send_ldap_result( op, rs );
2509                                         rs->sr_ctrls = NULL;
2510                                         return rs->sr_err;
2511                                 }
2512                                 goto shortcut;
2513                         }
2514                 } else {
2515                         /* consumer doesn't have the right number of CSNs */
2516                         changed = SS_CHANGED;
2517                 }
2518                 /* Do we have a sessionlog for this search? */
2519                 sl=si->si_logs;
2520                 if ( sl ) {
2521                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2522                         /* Are there any log entries, and is the consumer state
2523                          * present in the session log?
2524                          */
2525                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2526                                 do_present = 0;
2527                                 /* mutex is unlocked in playlog */
2528                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2529                         } else {
2530                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2531                         }
2532                 }
2533                 /* Is the CSN still present in the database? */
2534                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2535                         /* No, so a reload is required */
2536                         /* the 2.2 consumer doesn't send this hint */
2537                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2538                                 if ( ctxcsn )
2539                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2540                                 if ( sids )
2541                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2542                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2543                                 rs->sr_text = "sync cookie is stale";
2544                                 goto bailout;
2545                         }
2546                         if ( srs->sr_state.ctxcsn ) {
2547                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2548                                 srs->sr_state.ctxcsn = NULL;
2549                         }
2550                         if ( srs->sr_state.sids ) {
2551                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2552                                 srs->sr_state.sids = NULL;
2553                         }
2554                         srs->sr_state.numcsns = 0;
2555                 } else {
2556                         gotstate = 1;
2557                         /* If changed and doing Present lookup, send Present UUIDs */
2558                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2559                                 LDAP_SUCCESS ) {
2560                                 if ( ctxcsn )
2561                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2562                                 if ( sids )
2563                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2564                                 goto bailout;
2565                         }
2566                 }
2567         } else {
2568                 /* No consumer state, assume something has changed */
2569                 changed = SS_CHANGED;
2570         }
2571
2572 shortcut:
2573         /* Append CSN range to search filter, save original filter
2574          * for persistent search evaluation
2575          */
2576         if ( sop ) {
2577                 sop->s_filterstr= op->ors_filterstr;
2578         }
2579
2580         /* If something changed, find the changes */
2581         if ( gotstate && changed ) {
2582                 Filter *fand, *fava;
2583
2584                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2585                 fand->f_choice = LDAP_FILTER_AND;
2586                 fand->f_next = NULL;
2587                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2588                 fand->f_and = fava;
2589                 fava->f_choice = LDAP_FILTER_GE;
2590                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2591                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2592 #ifdef LDAP_COMP_MATCH
2593                 fava->f_ava->aa_cf = NULL;
2594 #endif
2595                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2596                 fava->f_next = op->ors_filter;
2597                 op->ors_filter = fand;
2598                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2599                 if ( sop )
2600                         sop->s_flags |= PS_FIX_FILTER;
2601         }
2602
2603         /* Let our callback add needed info to returned entries */
2604         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2605         ss = (searchstate *)(cb+1);
2606         ss->ss_on = on;
2607         ss->ss_so = sop;
2608         ss->ss_flags = do_present | changed;
2609         ss->ss_ctxcsn = ctxcsn;
2610         ss->ss_numcsns = numcsns;
2611         ss->ss_sids = sids;
2612         cb->sc_response = syncprov_search_response;
2613         cb->sc_cleanup = syncprov_search_cleanup;
2614         cb->sc_private = ss;
2615         cb->sc_next = op->o_callback;
2616         op->o_callback = cb;
2617
2618         /* If this is a persistent search and no changes were reported during
2619          * the refresh phase, just invoke the response callback to transition
2620          * us into persist phase
2621          */
2622         if ( !changed ) {
2623                 rs->sr_err = LDAP_SUCCESS;
2624                 rs->sr_nentries = 0;
2625                 send_ldap_result( op, rs );
2626                 return rs->sr_err;
2627         }
2628         return SLAP_CB_CONTINUE;
2629 }
2630
2631 static int
2632 syncprov_operational(
2633         Operation *op,
2634         SlapReply *rs )
2635 {
2636         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2637         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2638
2639         /* This prevents generating unnecessarily; frontend will strip
2640          * any statically stored copy.
2641          */
2642         if ( op->o_sync != SLAP_CONTROL_NONE )
2643                 return SLAP_CB_CONTINUE;
2644
2645         if ( rs->sr_entry &&
2646                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2647
2648                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2649                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2650                         Attribute *a, **ap = NULL;
2651
2652                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2653                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2654                                         break;
2655                         }
2656
2657                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2658                         if ( si->si_ctxcsn ) {
2659                                 if ( !a ) {
2660                                         for ( ap = &rs->sr_operational_attrs; *ap;
2661                                                 ap=&(*ap)->a_next );
2662
2663                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2664                                         *ap = a;
2665                                 }
2666
2667                                 if ( !ap ) {
2668                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2669                                                 Entry *e = entry_dup( rs->sr_entry );
2670                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2671                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2672                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2673                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2674                                                         entry_free( rs->sr_entry );
2675                                                 }
2676                                                 rs->sr_entry = e;
2677                                                 rs->sr_flags |=
2678                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2679                                                 a = attr_find( rs->sr_entry->e_attrs,
2680                                                         slap_schema.si_ad_contextCSN );
2681                                         }
2682                                         if ( a->a_nvals != a->a_vals ) {
2683                                                 ber_bvarray_free( a->a_nvals );
2684                                         }
2685                                         a->a_nvals = NULL;
2686                                         ber_bvarray_free( a->a_vals );
2687                                         a->a_vals = NULL;
2688                                         a->a_numvals = 0;
2689                                 }
2690                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2691                         }
2692                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2693                 }
2694         }
2695         return SLAP_CB_CONTINUE;
2696 }
2697
2698 enum {
2699         SP_CHKPT = 1,
2700         SP_SESSL,
2701         SP_NOPRES,
2702         SP_USEHINT
2703 };
2704
2705 static ConfigDriver sp_cf_gen;
2706
2707 static ConfigTable spcfg[] = {
2708         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2709                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2710                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2711                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2712         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2713                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2714                         "DESC 'Session log size in ops' "
2715                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2716         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2717                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2718                         "DESC 'Omit Present phase processing' "
2719                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2720         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2721                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2722                         "DESC 'Observe Reload Hint in Request control' "
2723                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2724         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2725 };
2726
2727 static ConfigOCs spocs[] = {
2728         { "( OLcfgOvOc:1.1 "
2729                 "NAME 'olcSyncProvConfig' "
2730                 "DESC 'SyncRepl Provider configuration' "
2731                 "SUP olcOverlayConfig "
2732                 "MAY ( olcSpCheckpoint "
2733                         "$ olcSpSessionlog "
2734                         "$ olcSpNoPresent "
2735                         "$ olcSpReloadHint "
2736                 ") )",
2737                         Cft_Overlay, spcfg },
2738         { NULL, 0, NULL }
2739 };
2740
2741 static int
2742 sp_cf_gen(ConfigArgs *c)
2743 {
2744         slap_overinst           *on = (slap_overinst *)c->bi;
2745         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2746         int rc = 0;
2747
2748         if ( c->op == SLAP_CONFIG_EMIT ) {
2749                 switch ( c->type ) {
2750                 case SP_CHKPT:
2751                         if ( si->si_chkops || si->si_chktime ) {
2752                                 struct berval bv;
2753                                 /* we assume si_chktime is a multiple of 60
2754                                  * because the parsed value was originally
2755                                  * multiplied by 60 */
2756                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2757                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2758                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2759                                         rc = 1;
2760                                 } else {
2761                                         bv.bv_val = c->cr_msg;
2762                                         value_add_one( &c->rvalue_vals, &bv );
2763                                 }
2764                         } else {
2765                                 rc = 1;
2766                         }
2767                         break;
2768                 case SP_SESSL:
2769                         if ( si->si_logs ) {
2770                                 c->value_int = si->si_logs->sl_size;
2771                         } else {
2772                                 rc = 1;
2773                         }
2774                         break;
2775                 case SP_NOPRES:
2776                         if ( si->si_nopres ) {
2777                                 c->value_int = 1;
2778                         } else {
2779                                 rc = 1;
2780                         }
2781                         break;
2782                 case SP_USEHINT:
2783                         if ( si->si_usehint ) {
2784                                 c->value_int = 1;
2785                         } else {
2786                                 rc = 1;
2787                         }
2788                         break;
2789                 }
2790                 return rc;
2791         } else if ( c->op == LDAP_MOD_DELETE ) {
2792                 switch ( c->type ) {
2793                 case SP_CHKPT:
2794                         si->si_chkops = 0;
2795                         si->si_chktime = 0;
2796                         break;
2797                 case SP_SESSL:
2798                         if ( si->si_logs )
2799                                 si->si_logs->sl_size = 0;
2800                         else
2801                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2802                         break;
2803                 case SP_NOPRES:
2804                         if ( si->si_nopres )
2805                                 si->si_nopres = 0;
2806                         else
2807                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2808                         break;
2809                 case SP_USEHINT:
2810                         if ( si->si_usehint )
2811                                 si->si_usehint = 0;
2812                         else
2813                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2814                         break;
2815                 }
2816                 return rc;
2817         }
2818         switch ( c->type ) {
2819         case SP_CHKPT:
2820                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2821                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2822                                 c->argv[0], c->argv[1] );
2823                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2824                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2825                         return ARG_BAD_CONF;
2826                 }
2827                 if ( si->si_chkops <= 0 ) {
2828                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2829                                 c->argv[0], si->si_chkops );
2830                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2831                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2832                         return ARG_BAD_CONF;
2833                 }
2834                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2835                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2836                                 c->argv[0], c->argv[1] );
2837                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2838                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2839                         return ARG_BAD_CONF;
2840                 }
2841                 if ( si->si_chktime <= 0 ) {
2842                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2843                                 c->argv[0], si->si_chkops );
2844                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2845                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2846                         return ARG_BAD_CONF;
2847                 }
2848                 si->si_chktime *= 60;
2849                 break;
2850         case SP_SESSL: {
2851                 sessionlog *sl;
2852                 int size = c->value_int;
2853
2854                 if ( size < 0 ) {
2855                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2856                                 c->argv[0], size );
2857                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2858                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2859                         return ARG_BAD_CONF;
2860                 }
2861                 sl = si->si_logs;
2862                 if ( !sl ) {
2863                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2864                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2865                         sl->sl_mincsn.bv_len = 0;
2866                         sl->sl_num = 0;
2867                         sl->sl_head = sl->sl_tail = NULL;
2868                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2869                         si->si_logs = sl;
2870                 }
2871                 sl->sl_size = size;
2872                 }
2873                 break;
2874         case SP_NOPRES:
2875                 si->si_nopres = c->value_int;
2876                 break;
2877         case SP_USEHINT:
2878                 si->si_usehint = c->value_int;
2879                 break;
2880         }
2881         return rc;
2882 }
2883
2884 /* ITS#3456 we cannot run this search on the main thread, must use a
2885  * child thread in order to insure we have a big enough stack.
2886  */
2887 static void *
2888 syncprov_db_otask(
2889         void *ptr
2890 )
2891 {
2892         syncprov_findcsn( ptr, FIND_MAXCSN );
2893         return NULL;
2894 }
2895
2896 /* Read any existing contextCSN from the underlying db.
2897  * Then search for any entries newer than that. If no value exists,
2898  * just generate it. Cache whatever result.
2899  */
2900 static int
2901 syncprov_db_open(
2902         BackendDB *be,
2903         ConfigReply *cr
2904 )
2905 {
2906         slap_overinst   *on = (slap_overinst *) be->bd_info;
2907         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2908
2909         Connection conn = { 0 };
2910         OperationBuffer opbuf;
2911         Operation *op;
2912         Entry *e = NULL;
2913         Attribute *a;
2914         int rc;
2915         void *thrctx = NULL;
2916
2917         if ( !SLAP_LASTMOD( be )) {
2918                 Debug( LDAP_DEBUG_ANY,
2919                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2920                 return -1;
2921         }
2922
2923         if ( slapMode & SLAP_TOOL_MODE ) {
2924                 return 0;
2925         }
2926
2927         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2928         if ( rc ) {
2929                 return rc;
2930         }
2931
2932         thrctx = ldap_pvt_thread_pool_context();
2933         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2934         op = &opbuf.ob_op;
2935         op->o_bd = be;
2936         op->o_dn = be->be_rootdn;
2937         op->o_ndn = be->be_rootndn;
2938
2939         if ( SLAP_SYNC_SUBENTRY( be )) {
2940                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2941                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2942         } else {
2943                 si->si_contextdn = be->be_nsuffix[0];
2944         }
2945         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2946                 slap_schema.si_ad_contextCSN, 0, &e, on );
2947
2948         if ( e ) {
2949                 ldap_pvt_thread_t tid;
2950
2951                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2952                 if ( a ) {
2953                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2954                         si->si_numcsns = a->a_numvals;
2955                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2956                 }
2957                 overlay_entry_release_ov( op, e, 0, on );
2958                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2959                         op->o_req_dn = be->be_suffix[0];
2960                         op->o_req_ndn = be->be_nsuffix[0];
2961                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2962                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2963                         ldap_pvt_thread_join( tid, NULL );
2964                 }
2965         }
2966
2967         /* Didn't find a contextCSN, should we generate one? */
2968         if ( !si->si_ctxcsn ) {
2969                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2970                 struct berval csn;
2971
2972                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2973                 /* If we're also a consumer, then don't generate anything.
2974                  * Wait for our provider to send it to us, or for a local
2975                  * modify if we have multimaster.
2976                  */
2977                         goto out;
2978                 }
2979                 csn.bv_val = csnbuf;
2980                 csn.bv_len = sizeof( csnbuf );
2981                 slap_get_csn( op, &csn, 0 );
2982                 value_add_one( &si->si_ctxcsn, &csn );
2983                 si->si_numcsns = 1;
2984                 si->si_sids = ch_malloc( sizeof(int) );
2985                 si->si_sids[0] = slap_serverID;
2986
2987                 /* make sure we do a checkpoint on close */
2988                 si->si_numops++;
2989         }
2990
2991 out:
2992         op->o_bd->bd_info = (BackendInfo *)on;
2993         return 0;
2994 }
2995
2996 /* Write the current contextCSN into the underlying db.
2997  */
2998 static int
2999 syncprov_db_close(
3000         BackendDB *be,
3001         ConfigReply *cr
3002 )
3003 {
3004     slap_overinst   *on = (slap_overinst *) be->bd_info;
3005     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3006
3007         if ( slapMode & SLAP_TOOL_MODE ) {
3008                 return 0;
3009         }
3010         if ( si->si_numops ) {
3011                 Connection conn = {0};
3012                 OperationBuffer opbuf;
3013                 Operation *op;
3014                 SlapReply rs = {REP_RESULT};
3015                 void *thrctx;
3016
3017                 thrctx = ldap_pvt_thread_pool_context();
3018                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3019                 op = &opbuf.ob_op;
3020                 op->o_bd = be;
3021                 op->o_dn = be->be_rootdn;
3022                 op->o_ndn = be->be_rootndn;
3023                 syncprov_checkpoint( op, &rs, on );
3024         }
3025
3026     return 0;
3027 }
3028
3029 static int
3030 syncprov_db_init(
3031         BackendDB *be,
3032         ConfigReply *cr
3033 )
3034 {
3035         slap_overinst   *on = (slap_overinst *)be->bd_info;
3036         syncprov_info_t *si;
3037
3038         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3039                 Debug( LDAP_DEBUG_ANY,
3040                         "syncprov must be instantiated within a database.\n",
3041                         0, 0, 0 );
3042                 return 1;
3043         }
3044
3045         si = ch_calloc(1, sizeof(syncprov_info_t));
3046         on->on_bi.bi_private = si;
3047         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3048         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3049         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3050         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3051
3052         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3053         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3054         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3055         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3056
3057         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3058         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3059
3060         return 0;
3061 }
3062
3063 static int
3064 syncprov_db_destroy(
3065         BackendDB *be,
3066         ConfigReply *cr
3067 )
3068 {
3069         slap_overinst   *on = (slap_overinst *)be->bd_info;
3070         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3071
3072         if ( si ) {
3073                 if ( si->si_logs ) {
3074                         slog_entry *se = si->si_logs->sl_head;
3075
3076                         while ( se ) {
3077                                 slog_entry *se_next = se->se_next;
3078                                 ch_free( se );
3079                                 se = se_next;
3080                         }
3081
3082                         ch_free( si->si_logs );
3083                 }
3084                 if ( si->si_ctxcsn )
3085                         ber_bvarray_free( si->si_ctxcsn );
3086                 if ( si->si_sids )
3087                         ch_free( si->si_sids );
3088                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3089                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3090                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3091                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3092                 ch_free( si );
3093         }
3094
3095         return 0;
3096 }
3097
3098 static int syncprov_parseCtrl (
3099         Operation *op,
3100         SlapReply *rs,
3101         LDAPControl *ctrl )
3102 {
3103         ber_tag_t tag;
3104         BerElementBuffer berbuf;
3105         BerElement *ber = (BerElement *)&berbuf;
3106         ber_int_t mode;
3107         ber_len_t len;
3108         struct berval cookie = BER_BVNULL;
3109         sync_control *sr;
3110         int rhint = 0;
3111
3112         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3113                 rs->sr_text = "Sync control specified multiple times";
3114                 return LDAP_PROTOCOL_ERROR;
3115         }
3116
3117         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3118                 rs->sr_text = "Sync control specified with pagedResults control";
3119                 return LDAP_PROTOCOL_ERROR;
3120         }
3121
3122         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3123                 rs->sr_text = "Sync control value is absent";
3124                 return LDAP_PROTOCOL_ERROR;
3125         }
3126
3127         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3128                 rs->sr_text = "Sync control value is empty";
3129                 return LDAP_PROTOCOL_ERROR;
3130         }
3131
3132         /* Parse the control value
3133          *      syncRequestValue ::= SEQUENCE {
3134          *              mode   ENUMERATED {
3135          *                      -- 0 unused
3136          *                      refreshOnly             (1),
3137          *                      -- 2 reserved
3138          *                      refreshAndPersist       (3)
3139          *              },
3140          *              cookie  syncCookie OPTIONAL
3141          *      }
3142          */
3143
3144         ber_init2( ber, &ctrl->ldctl_value, 0 );
3145
3146         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3147                 rs->sr_text = "Sync control : mode decoding error";
3148                 return LDAP_PROTOCOL_ERROR;
3149         }
3150
3151         switch( mode ) {
3152         case LDAP_SYNC_REFRESH_ONLY:
3153                 mode = SLAP_SYNC_REFRESH;
3154                 break;
3155         case LDAP_SYNC_REFRESH_AND_PERSIST:
3156                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3157                 break;
3158         default:
3159                 rs->sr_text = "Sync control : unknown update mode";
3160                 return LDAP_PROTOCOL_ERROR;
3161         }
3162
3163         tag = ber_peek_tag( ber, &len );
3164
3165         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3166                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3167                         rs->sr_text = "Sync control : cookie decoding error";
3168                         return LDAP_PROTOCOL_ERROR;
3169                 }
3170                 tag = ber_peek_tag( ber, &len );
3171         }
3172         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3173                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3174                         rs->sr_text = "Sync control : rhint decoding error";
3175                         return LDAP_PROTOCOL_ERROR;
3176                 }
3177         }
3178         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3179                         rs->sr_text = "Sync control : decoding error";
3180                         return LDAP_PROTOCOL_ERROR;
3181         }
3182         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3183         sr->sr_rhint = rhint;
3184         if (!BER_BVISNULL(&cookie)) {
3185                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3186                 /* If parse fails, pretend no cookie was sent */
3187                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3188                         sr->sr_state.rid == -1 ) {
3189                         if ( sr->sr_state.ctxcsn ) {
3190                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3191                                 sr->sr_state.ctxcsn = NULL;
3192                         }
3193                         sr->sr_state.numcsns = 0;
3194                 }
3195         }
3196
3197         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3198
3199         op->o_sync = ctrl->ldctl_iscritical
3200                 ? SLAP_CONTROL_CRITICAL
3201                 : SLAP_CONTROL_NONCRITICAL;
3202
3203         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3204
3205         return LDAP_SUCCESS;
3206 }
3207
3208 /* This overlay is set up for dynamic loading via moduleload. For static
3209  * configuration, you'll need to arrange for the slap_overinst to be
3210  * initialized and registered by some other function inside slapd.
3211  */
3212
3213 static slap_overinst            syncprov;
3214
3215 int
3216 syncprov_initialize()
3217 {
3218         int rc;
3219
3220         rc = register_supported_control( LDAP_CONTROL_SYNC,
3221                 SLAP_CTRL_SEARCH, NULL,
3222                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3223         if ( rc != LDAP_SUCCESS ) {
3224                 Debug( LDAP_DEBUG_ANY,
3225                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3226                 return rc;
3227         }
3228
3229         syncprov.on_bi.bi_type = "syncprov";
3230         syncprov.on_bi.bi_db_init = syncprov_db_init;
3231         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3232         syncprov.on_bi.bi_db_open = syncprov_db_open;
3233         syncprov.on_bi.bi_db_close = syncprov_db_close;
3234
3235         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3236         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3237
3238         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3239         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3240         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3241         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3242         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3243         syncprov.on_bi.bi_op_search = syncprov_op_search;
3244         syncprov.on_bi.bi_extended = syncprov_op_extended;
3245         syncprov.on_bi.bi_operational = syncprov_operational;
3246
3247         syncprov.on_bi.bi_cf_ocs = spocs;
3248
3249         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3250
3251         rc = config_register_schema( spcfg, spocs );
3252         if ( rc ) return rc;
3253
3254         return overlay_register( &syncprov );
3255 }
3256
3257 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3258 int
3259 init_module( int argc, char *argv[] )
3260 {
3261         return syncprov_initialize();
3262 }
3263 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3264
3265 #endif /* defined(SLAPD_OVER_SYNCPROV) */