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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2009 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74 #define PS_TASK_QUEUED          0x20
  75
  76         int             s_inuse;        /* reference count */
  77         struct syncres *s_res;
  78         struct syncres *s_restail;
  79         ldap_pvt_thread_mutex_t s_mutex;
  80 } syncops;
  81
  82 /* A received sync control */
  83 typedef struct sync_control {
  84         struct sync_cookie sr_state;
  85         int sr_rhint;
  86 } sync_control;
  87
  88 #if 0 /* moved back to slap.h */
  89 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  90 #endif
  91 /* o_sync_mode uses data bits of o_sync */
  92 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  93
  94 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  95 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  98
  99 /* Record of which searches matched at premodify step */
 100 typedef struct syncmatches {
 101         struct syncmatches *sm_next;
 102         syncops *sm_op;
 103 } syncmatches;
 104
 105 /* Session log data */
 106 typedef struct slog_entry {
 107         struct slog_entry *se_next;
 108         struct berval se_uuid;
 109         struct berval se_csn;
 110         int     se_sid;
 111         ber_tag_t       se_tag;
 112 } slog_entry;
 113
 114 typedef struct sessionlog {
 115         struct berval   sl_mincsn;
 116         int             sl_num;
 117         int             sl_size;
 118         slog_entry *sl_head;
 119         slog_entry *sl_tail;
 120         ldap_pvt_thread_mutex_t sl_mutex;
 121 } sessionlog;
 122
 123 /* The main state for this overlay */
 124 typedef struct syncprov_info_t {
 125         syncops         *si_ops;
 126         BerVarray       si_ctxcsn;      /* ldapsync context */
 127         struct berval   si_contextdn;
 128         int             *si_sids;
 129         int             si_numcsns;
 130         int             si_chkops;      /* checkpointing info */
 131         int             si_chktime;
 132         int             si_numops;      /* number of ops since last checkpoint */
 133         int             si_nopres;      /* Skip present phase */
 134         int             si_usehint;     /* use reload hint */
 135         time_t  si_chklast;     /* time of last checkpoint */
 136         Avlnode *si_mods;       /* entries being modified */
 137         sessionlog      *si_logs;
 138         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 139         ldap_pvt_thread_mutex_t si_ops_mutex;
 140         ldap_pvt_thread_mutex_t si_mods_mutex;
 141         ldap_pvt_thread_mutex_t si_resp_mutex;
 142 } syncprov_info_t;
 143
 144 typedef struct opcookie {
 145         slap_overinst *son;
 146         syncmatches *smatches;
 147         modtarget *smt;
 148         struct berval sdn;      /* DN of entry, for deletes */
 149         struct berval sndn;
 150         struct berval suuid;    /* UUID of entry */
 151         struct berval sctxcsn;
 152         short osid;     /* sid of op csn */
 153         short rsid;     /* sid of relay */
 154         short sreference;       /* Is the entry a reference? */
 155 } opcookie;
 156
 157 typedef struct fbase_cookie {
 158         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 159         syncops *fss;   /* persistent search we're testing against */
 160         int fbase;      /* if TRUE we found the search base and it's still valid */
 161         int fscope;     /* if TRUE then fdn is within the psearch scope */
 162 } fbase_cookie;
 163
 164 static AttributeName csn_anlist[3];
 165 static AttributeName uuid_anlist[2];
 166
 167 /* Build a LDAPsync intermediate state control */
 168 static int
 169 syncprov_state_ctrl(
 170         Operation       *op,
 171         SlapReply       *rs,
 172         Entry           *e,
 173         int             entry_sync_state,
 174         LDAPControl     **ctrls,
 175         int             num_ctrls,
 176         int             send_cookie,
 177         struct berval   *cookie )
 178 {
 179         Attribute* a;
 180         int ret;
 181
 182         BerElementBuffer berbuf;
 183         BerElement *ber = (BerElement *)&berbuf;
 184
 185         struct berval   entryuuid_bv = BER_BVNULL;
 186
 187         ber_init2( ber, 0, LBER_USE_DER );
 188         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 189
 190         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 191
 192         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 193                 AttributeDescription *desc = a->a_desc;
 194                 if ( desc == slap_schema.si_ad_entryUUID ) {
 195                         entryuuid_bv = a->a_nvals[0];
 196                         break;
 197                 }
 198         }
 199
 200         /* FIXME: what if entryuuid is NULL or empty ? */
 201
 202         if ( send_cookie && cookie ) {
 203                 ber_printf( ber, "{eOON}",
 204                         entry_sync_state, &entryuuid_bv, cookie );
 205         } else {
 206                 ber_printf( ber, "{eON}",
 207                         entry_sync_state, &entryuuid_bv );
 208         }
 209
 210         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 211         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 212         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 213
 214         ber_free_buf( ber );
 215
 216         if ( ret < 0 ) {
 217                 Debug( LDAP_DEBUG_TRACE,
 218                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 219                         0, 0, 0 );
 220                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 221                 return ret;
 222         }
 223
 224         return LDAP_SUCCESS;
 225 }
 226
 227 /* Build a LDAPsync final state control */
 228 static int
 229 syncprov_done_ctrl(
 230         Operation       *op,
 231         SlapReply       *rs,
 232         LDAPControl     **ctrls,
 233         int                     num_ctrls,
 234         int                     send_cookie,
 235         struct berval *cookie,
 236         int                     refreshDeletes )
 237 {
 238         int ret;
 239         BerElementBuffer berbuf;
 240         BerElement *ber = (BerElement *)&berbuf;
 241
 242         ber_init2( ber, NULL, LBER_USE_DER );
 243         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 244
 245         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 246
 247         ber_printf( ber, "{" );
 248         if ( send_cookie && cookie ) {
 249                 ber_printf( ber, "O", cookie );
 250         }
 251         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 252                 ber_printf( ber, "b", refreshDeletes );
 253         }
 254         ber_printf( ber, "N}" );
 255
 256         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 257         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 258         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 259
 260         ber_free_buf( ber );
 261
 262         if ( ret < 0 ) {
 263                 Debug( LDAP_DEBUG_TRACE,
 264                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 265                         0, 0, 0 );
 266                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 267                 return ret;
 268         }
 269
 270         return LDAP_SUCCESS;
 271 }
 272
 273 static int
 274 syncprov_sendinfo(
 275         Operation       *op,
 276         SlapReply       *rs,
 277         int                     type,
 278         struct berval *cookie,
 279         int                     refreshDone,
 280         BerVarray       syncUUIDs,
 281         int                     refreshDeletes )
 282 {
 283         BerElementBuffer berbuf;
 284         BerElement *ber = (BerElement *)&berbuf;
 285         struct berval rspdata;
 286
 287         int ret;
 288
 289         ber_init2( ber, NULL, LBER_USE_DER );
 290         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 291
 292         if ( type ) {
 293                 switch ( type ) {
 294                 case LDAP_TAG_SYNC_NEW_COOKIE:
 295                         ber_printf( ber, "tO", type, cookie );
 296                         break;
 297                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 298                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 299                         ber_printf( ber, "t{", type );
 300                         if ( cookie ) {
 301                                 ber_printf( ber, "O", cookie );
 302                         }
 303                         if ( refreshDone == 0 ) {
 304                                 ber_printf( ber, "b", refreshDone );
 305                         }
 306                         ber_printf( ber, "N}" );
 307                         break;
 308                 case LDAP_TAG_SYNC_ID_SET:
 309                         ber_printf( ber, "t{", type );
 310                         if ( cookie ) {
 311                                 ber_printf( ber, "O", cookie );
 312                         }
 313                         if ( refreshDeletes == 1 ) {
 314                                 ber_printf( ber, "b", refreshDeletes );
 315                         }
 316                         ber_printf( ber, "[W]", syncUUIDs );
 317                         ber_printf( ber, "N}" );
 318                         break;
 319                 default:
 320                         Debug( LDAP_DEBUG_TRACE,
 321                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 322                                 type, 0, 0 );
 323                         return LDAP_OTHER;
 324                 }
 325         }
 326
 327         ret = ber_flatten2( ber, &rspdata, 0 );
 328
 329         if ( ret < 0 ) {
 330                 Debug( LDAP_DEBUG_TRACE,
 331                         "syncprov_sendinfo: ber_flatten2 failed\n",
 332                         0, 0, 0 );
 333                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 334                 return ret;
 335         }
 336
 337         rs->sr_rspoid = LDAP_SYNC_INFO;
 338         rs->sr_rspdata = &rspdata;
 339         send_ldap_intermediate( op, rs );
 340         rs->sr_rspdata = NULL;
 341         ber_free_buf( ber );
 342
 343         return LDAP_SUCCESS;
 344 }
 345
 346 /* Find a modtarget in an AVL tree */
 347 static int
 348 sp_avl_cmp( const void *c1, const void *c2 )
 349 {
 350         const modtarget *m1, *m2;
 351         int rc;
 352
 353         m1 = c1; m2 = c2;
 354         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 355
 356         if ( rc ) return rc;
 357         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 358 }
 359
 360 /* syncprov_findbase:
 361  *   finds the true DN of the base of a search (with alias dereferencing) and
 362  * checks to make sure the base entry doesn't get replaced with a different
 363  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 364  * change is detected, any persistent search on this base must be terminated /
 365  * reloaded.
 366  *   On the first call, we just save the DN and entryID. On subsequent calls
 367  * we compare the DN and entryID with the saved values.
 368  */
 369 static int
 370 findbase_cb( Operation *op, SlapReply *rs )
 371 {
 372         slap_callback *sc = op->o_callback;
 373
 374         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 375                 fbase_cookie *fc = sc->sc_private;
 376
 377                 /* If no entryID, we're looking for the first time.
 378                  * Just store whatever we got.
 379                  */
 380                 if ( fc->fss->s_eid == NOID ) {
 381                         fc->fbase = 2;
 382                         fc->fss->s_eid = rs->sr_entry->e_id;
 383                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 384
 385                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 386                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 387
 388                 /* OK, the DN is the same and the entryID is the same. */
 389                         fc->fbase = 1;
 390                 }
 391         }
 392         if ( rs->sr_err != LDAP_SUCCESS ) {
 393                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 394         }
 395         return LDAP_SUCCESS;
 396 }
 397
 398 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 399 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 400
 401 static int
 402 syncprov_findbase( Operation *op, fbase_cookie *fc )
 403 {
 404         /* Use basic parameters from syncrepl search, but use
 405          * current op's threadctx / tmpmemctx
 406          */
 407         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 408         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 409                 slap_callback cb = {0};
 410                 Operation fop;
 411                 SlapReply frs = { REP_RESULT };
 412                 int rc;
 413
 414                 fc->fss->s_flags ^= PS_FIND_BASE;
 415                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 416
 417                 fop = *fc->fss->s_op;
 418
 419                 fop.o_bd = fop.o_bd->bd_self;
 420                 fop.o_hdr = op->o_hdr;
 421                 fop.o_time = op->o_time;
 422                 fop.o_tincr = op->o_tincr;
 423
 424                 cb.sc_response = findbase_cb;
 425                 cb.sc_private = fc;
 426
 427                 fop.o_sync_mode = 0;    /* turn off sync mode */
 428                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 429                 fop.o_callback = &cb;
 430                 fop.o_tag = LDAP_REQ_SEARCH;
 431                 fop.ors_scope = LDAP_SCOPE_BASE;
 432                 fop.ors_limit = NULL;
 433                 fop.ors_slimit = 1;
 434                 fop.ors_tlimit = SLAP_NO_LIMIT;
 435                 fop.ors_attrs = slap_anlist_no_attrs;
 436                 fop.ors_attrsonly = 1;
 437                 fop.ors_filter = &generic_filter;
 438                 fop.ors_filterstr = generic_filterstr;
 439
 440                 rc = fop.o_bd->be_search( &fop, &frs );
 441         } else {
 442                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 443                 fc->fbase = 1;
 444         }
 445
 446         /* After the first call, see if the fdn resides in the scope */
 447         if ( fc->fbase == 1 ) {
 448                 switch ( fc->fss->s_op->ors_scope ) {
 449                 case LDAP_SCOPE_BASE:
 450                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 451                         break;
 452                 case LDAP_SCOPE_ONELEVEL: {
 453                         struct berval pdn;
 454                         dnParent( fc->fdn, &pdn );
 455                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 456                         break; }
 457                 case LDAP_SCOPE_SUBTREE:
 458                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 459                         break;
 460                 case LDAP_SCOPE_SUBORDINATE:
 461                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 462                                 !dn_match( fc->fdn, &fc->fss->s_base );
 463                         break;
 464                 }
 465         }
 466
 467         if ( fc->fbase )
 468                 return LDAP_SUCCESS;
 469
 470         /* If entryID has changed, then the base of this search has
 471          * changed. Invalidate the psearch.
 472          */
 473         return LDAP_NO_SUCH_OBJECT;
 474 }
 475
 476 /* syncprov_findcsn:
 477  *   This function has three different purposes, but they all use a search
 478  * that filters on entryCSN so they're combined here.
 479  * 1: at startup time, after a contextCSN has been read from the database,
 480  * we search for all entries with CSN >= contextCSN in case the contextCSN
 481  * was not checkpointed at the previous shutdown.
 482  *
 483  * 2: when the current contextCSN is known and we have a sync cookie, we search
 484  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 485  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 486  *
 487  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 488  * CSN, and generate Present records for them. We always collect this result
 489  * in SyncID sets, even if there's only one match.
 490  */
 491 typedef enum find_csn_t {
 492         FIND_MAXCSN     = 1,
 493         FIND_CSN        = 2,
 494         FIND_PRESENT    = 3
 495 } find_csn_t;
 496
 497 static int
 498 findmax_cb( Operation *op, SlapReply *rs )
 499 {
 500         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 501                 struct berval *maxcsn = op->o_callback->sc_private;
 502                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 503                         slap_schema.si_ad_entryCSN );
 504
 505                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 506                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 507                         maxcsn->bv_len = a->a_vals[0].bv_len;
 508                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 509                 }
 510         }
 511         return LDAP_SUCCESS;
 512 }
 513
 514 static int
 515 findcsn_cb( Operation *op, SlapReply *rs )
 516 {
 517         slap_callback *sc = op->o_callback;
 518
 519         /* We just want to know that at least one exists, so it's OK if
 520          * we exceed the unchecked limit.
 521          */
 522         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 523                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 524                 sc->sc_private = (void *)1;
 525         }
 526         return LDAP_SUCCESS;
 527 }
 528
 529 /* Build a list of entryUUIDs for sending in a SyncID set */
 530
 531 #define UUID_LEN        16
 532
 533 typedef struct fpres_cookie {
 534         int num;
 535         BerVarray uuids;
 536         char *last;
 537 } fpres_cookie;
 538
 539 static int
 540 findpres_cb( Operation *op, SlapReply *rs )
 541 {
 542         slap_callback *sc = op->o_callback;
 543         fpres_cookie *pc = sc->sc_private;
 544         Attribute *a;
 545         int ret = SLAP_CB_CONTINUE;
 546
 547         switch ( rs->sr_type ) {
 548         case REP_SEARCH:
 549                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 550                 if ( a ) {
 551                         pc->uuids[pc->num].bv_val = pc->last;
 552                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 553                                 pc->uuids[pc->num].bv_len );
 554                         pc->num++;
 555                         pc->last = pc->uuids[pc->num].bv_val;
 556                         pc->uuids[pc->num].bv_val = NULL;
 557                 }
 558                 ret = LDAP_SUCCESS;
 559                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 560                         break;
 561                 /* FALLTHRU */
 562         case REP_RESULT:
 563                 ret = rs->sr_err;
 564                 if ( pc->num ) {
 565                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 566                                 0, pc->uuids, 0 );
 567                         pc->uuids[pc->num].bv_val = pc->last;
 568                         pc->num = 0;
 569                         pc->last = pc->uuids[0].bv_val;
 570                 }
 571                 break;
 572         default:
 573                 break;
 574         }
 575         return ret;
 576 }
 577
 578 static int
 579 syncprov_findcsn( Operation *op, find_csn_t mode )
 580 {
 581         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 582         syncprov_info_t         *si = on->on_bi.bi_private;
 583
 584         slap_callback cb = {0};
 585         Operation fop;
 586         SlapReply frs = { REP_RESULT };
 587         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 588         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 589         struct berval maxcsn;
 590         Filter cf;
 591         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 592         fpres_cookie pcookie;
 593         sync_control *srs = NULL;
 594         struct slap_limits_set fc_limits;
 595         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 596         int maxid;
 597
 598         if ( mode != FIND_MAXCSN ) {
 599                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 600         }
 601
 602         fop = *op;
 603         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 604         /* We want pure entries, not referrals */
 605         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 606
 607         cf.f_ava = &eq;
 608         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 609         BER_BVZERO( &cf.f_av_value );
 610         cf.f_next = NULL;
 611
 612         fop.o_callback = &cb;
 613         fop.ors_limit = NULL;
 614         fop.ors_tlimit = SLAP_NO_LIMIT;
 615         fop.ors_filter = &cf;
 616         fop.ors_filterstr.bv_val = buf;
 617
 618 again:
 619         switch( mode ) {
 620         case FIND_MAXCSN:
 621                 cf.f_choice = LDAP_FILTER_GE;
 622                 /* If there are multiple CSNs, use the one with our serverID */
 623                 for ( i=0; i<si->si_numcsns; i++) {
 624                         if ( slap_serverID == si->si_sids[i] ) {
 625                                 maxid = i;
 626                                 break;
 627                         }
 628                 }
 629                 if ( i == si->si_numcsns ) {
 630                         /* No match: this is multimaster, and none of the content in the DB
 631                          * originated locally. Treat like no CSN.
 632                          */
 633                         return LDAP_NO_SUCH_OBJECT;
 634                 }
 635                 cf.f_av_value = si->si_ctxcsn[maxid];
 636                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 637                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 638                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 639                         return LDAP_OTHER;
 640                 }
 641                 fop.ors_attrsonly = 0;
 642                 fop.ors_attrs = csn_anlist;
 643                 fop.ors_slimit = SLAP_NO_LIMIT;
 644                 cb.sc_private = &maxcsn;
 645                 cb.sc_response = findmax_cb;
 646                 strcpy( cbuf, cf.f_av_value.bv_val );
 647                 maxcsn.bv_val = cbuf;
 648                 maxcsn.bv_len = cf.f_av_value.bv_len;
 649                 break;
 650         case FIND_CSN:
 651                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 652                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 653                         /* If there are multiple CSNs, use the smallest */
 654                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 655                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 656                                         > 0 ) {
 657                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 658                                 }
 659                         }
 660                 }
 661                 /* Look for exact match the first time */
 662                 if ( findcsn_retry ) {
 663                         cf.f_choice = LDAP_FILTER_EQUALITY;
 664                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 665                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 666                 /* On retry, look for <= */
 667                 } else {
 668                         cf.f_choice = LDAP_FILTER_LE;
 669                         fop.ors_limit = &fc_limits;
 670                         memset( &fc_limits, 0, sizeof( fc_limits ));
 671                         fc_limits.lms_s_unchecked = 1;
 672                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 673                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 674                 }
 675                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 676                         return LDAP_OTHER;
 677                 }
 678                 fop.ors_attrsonly = 1;
 679                 fop.ors_attrs = slap_anlist_no_attrs;
 680                 fop.ors_slimit = 1;
 681                 cb.sc_private = NULL;
 682                 cb.sc_response = findcsn_cb;
 683                 break;
 684         case FIND_PRESENT:
 685                 fop.ors_filter = op->ors_filter;
 686                 fop.ors_filterstr = op->ors_filterstr;
 687                 fop.ors_attrsonly = 0;
 688                 fop.ors_attrs = uuid_anlist;
 689                 fop.ors_slimit = SLAP_NO_LIMIT;
 690                 cb.sc_private = &pcookie;
 691                 cb.sc_response = findpres_cb;
 692                 pcookie.num = 0;
 693
 694                 /* preallocate storage for a full set */
 695                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 696                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 697                         op->o_tmpmemctx );
 698                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 699                 pcookie.uuids[0].bv_val = pcookie.last;
 700                 pcookie.uuids[0].bv_len = UUID_LEN;
 701                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 702                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 703                         pcookie.uuids[i].bv_len = UUID_LEN;
 704                 }
 705                 break;
 706         }
 707
 708         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 709         fop.o_bd->be_search( &fop, &frs );
 710         fop.o_bd->bd_info = (BackendInfo *)on;
 711
 712         switch( mode ) {
 713         case FIND_MAXCSN:
 714                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 715 #ifdef CHECK_CSN
 716                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 717                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 718 #endif
 719                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 720                         si->si_numops++;        /* ensure a checkpoint */
 721                 }
 722                 break;
 723         case FIND_CSN:
 724                 /* If matching CSN was not found, invalidate the context. */
 725                 if ( !cb.sc_private ) {
 726                         /* If we didn't find an exact match, then try for <= */
 727                         if ( findcsn_retry ) {
 728                                 findcsn_retry = 0;
 729                                 goto again;
 730                         }
 731                         rc = LDAP_NO_SUCH_OBJECT;
 732                 }
 733                 break;
 734         case FIND_PRESENT:
 735                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 736                 break;
 737         }
 738
 739         return rc;
 740 }
 741
 742 static void
 743 syncprov_free_syncop( syncops *so )
 744 {
 745         syncres *sr, *srnext;
 746         GroupAssertion *ga, *gnext;
 747
 748         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 749         if ( --so->s_inuse > 0 ) {
 750                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 751                 return;
 752         }
 753         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 754         if ( so->s_flags & PS_IS_DETACHED ) {
 755                 filter_free( so->s_op->ors_filter );
 756                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 757                         gnext = ga->ga_next;
 758                         ch_free( ga );
 759                 }
 760                 ch_free( so->s_op );
 761         }
 762         ch_free( so->s_base.bv_val );
 763         for ( sr=so->s_res; sr; sr=srnext ) {
 764                 srnext = sr->s_next;
 765                 ch_free( sr );
 766         }
 767         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 768         ch_free( so );
 769 }
 770
 771 /* Send a persistent search response */
 772 static int
 773 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 774         Entry **e, int mode )
 775 {
 776         slap_overinst *on = opc->son;
 777
 778         SlapReply rs = { REP_SEARCH };
 779         LDAPControl *ctrls[2];
 780         struct berval cookie = BER_BVNULL, csns[2];
 781         Entry e_uuid = {0};
 782         Attribute a_uuid = {0};
 783
 784         if ( so->s_op->o_abandon )
 785                 return SLAPD_ABANDON;
 786
 787         ctrls[1] = NULL;
 788         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 789                 csns[0] = opc->sctxcsn;
 790                 BER_BVZERO( &csns[1] );
 791                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 792         }
 793
 794 #ifdef LDAP_DEBUG
 795         if ( so->s_sid > 0 ) {
 796                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 797                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 798         } else {
 799                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 800                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 801         }
 802 #endif
 803
 804         e_uuid.e_attrs = &a_uuid;
 805         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 806         a_uuid.a_nvals = &opc->suuid;
 807         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 808                 mode, ctrls, 0, 1, &cookie );
 809         if ( !BER_BVISNULL( &cookie )) {
 810                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 811         }
 812
 813         rs.sr_ctrls = ctrls;
 814         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 815         switch( mode ) {
 816         case LDAP_SYNC_ADD:
 817                 rs.sr_entry = *e;
 818                 if ( rs.sr_entry->e_private )
 819                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 820                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 821                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 822                         rs.sr_err = send_search_reference( op, &rs );
 823                         ber_bvarray_free( rs.sr_ref );
 824                         if ( !rs.sr_entry )
 825                                 *e = NULL;
 826                         break;
 827                 }
 828                 /* fallthru */
 829         case LDAP_SYNC_MODIFY:
 830                 rs.sr_entry = *e;
 831                 if ( rs.sr_entry->e_private )
 832                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 833                 rs.sr_attrs = op->ors_attrs;
 834                 rs.sr_err = send_search_entry( op, &rs );
 835                 if ( !rs.sr_entry )
 836                         *e = NULL;
 837                 break;
 838         case LDAP_SYNC_DELETE:
 839                 e_uuid.e_attrs = NULL;
 840                 e_uuid.e_name = opc->sdn;
 841                 e_uuid.e_nname = opc->sndn;
 842                 rs.sr_entry = &e_uuid;
 843                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 844                         struct berval bv = BER_BVNULL;
 845                         rs.sr_ref = &bv;
 846                         rs.sr_err = send_search_reference( op, &rs );
 847                 } else {
 848                         rs.sr_err = send_search_entry( op, &rs );
 849                 }
 850                 break;
 851         default:
 852                 assert(0);
 853         }
 854         /* In case someone else freed it already? */
 855         if ( rs.sr_ctrls ) {
 856                 int i;
 857                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 858                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 859                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 860                                 ctrls[0]->ldctl_value.bv_val = NULL;
 861                                 break;
 862                         }
 863                 }
 864                 rs.sr_ctrls = NULL;
 865         }
 866
 867         return rs.sr_err;
 868 }
 869
 870 static void
 871 syncprov_qstart( syncops *so );
 872
 873 /* Play back queued responses */
 874 static int
 875 syncprov_qplay( Operation *op, syncops *so )
 876 {
 877         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 878         syncres *sr;
 879         Entry *e;
 880         opcookie opc;
 881         int rc = 0;
 882
 883         opc.son = on;
 884
 885         do {
 886                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 887                 sr = so->s_res;
 888                 if ( sr )
 889                         so->s_res = sr->s_next;
 890                 if ( !so->s_res )
 891                         so->s_restail = NULL;
 892                 /* Exit loop with mutex held */
 893                 if ( !sr || so->s_op->o_abandon )
 894                         break;
 895                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 896
 897                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 898                     SlapReply rs = { REP_INTERMEDIATE };
 899
 900                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 901                                 &sr->s_csn, 0, NULL, 0 );
 902                 } else {
 903                         opc.sdn = sr->s_dn;
 904                         opc.sndn = sr->s_ndn;
 905                         opc.suuid = sr->s_uuid;
 906                         opc.sctxcsn = sr->s_csn;
 907                         opc.sreference = sr->s_isreference;
 908                         e = NULL;
 909
 910                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 911                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 912                                 if ( rc ) {
 913                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 914                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 915                                         ch_free( sr );
 916                                         rc = 0;
 917                                         continue;
 918                                 }
 919                         }
 920                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 921
 922                         if ( e ) {
 923                                 overlay_entry_release_ov( op, e, 0, on );
 924                         }
 925                 }
 926
 927                 ch_free( sr );
 928
 929                 /* Exit loop with mutex held */
 930                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 931
 932         } while (0);
 933
 934         /* We now only send one change at a time, to prevent one
 935          * psearch from hogging all the CPU. Resubmit this task if
 936          * there are more responses queued and no errors occurred.
 937          */
 938
 939         if ( rc == 0 && so->s_res ) {
 940                 syncprov_qstart( so );
 941         } else {
 942                 so->s_flags ^= PS_TASK_QUEUED;
 943         }
 944
 945         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 946         return rc;
 947 }
 948
 949 /* task for playing back queued responses */
 950 static void *
 951 syncprov_qtask( void *ctx, void *arg )
 952 {
 953         syncops *so = arg;
 954         OperationBuffer opbuf;
 955         Operation *op;
 956         BackendDB be;
 957         int rc;
 958
 959         op = &opbuf.ob_op;
 960         *op = *so->s_op;
 961         op->o_hdr = &opbuf.ob_hdr;
 962         op->o_controls = opbuf.ob_controls;
 963         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 964
 965         *op->o_hdr = *so->s_op->o_hdr;
 966
 967         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 968         op->o_tmpmfuncs = &slap_sl_mfuncs;
 969         op->o_threadctx = ctx;
 970
 971         /* syncprov_qplay expects a fake db */
 972         be = *so->s_op->o_bd;
 973         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 974         op->o_bd = &be;
 975         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 976         op->o_callback = NULL;
 977
 978         rc = syncprov_qplay( op, so );
 979
 980         /* decrement use count... */
 981         syncprov_free_syncop( so );
 982
 983         return NULL;
 984 }
 985
 986 /* Start the task to play back queued psearch responses */
 987 static void
 988 syncprov_qstart( syncops *so )
 989 {
 990         so->s_flags |= PS_TASK_QUEUED;
 991         so->s_inuse++;
 992         ldap_pvt_thread_pool_submit( &connection_pool,
 993                 syncprov_qtask, so );
 994 }
 995
 996 /* Queue a persistent search response */
 997 static int
 998 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 999 {
1000         syncres *sr;
1001         int srsize;
1002         struct berval cookie = opc->sctxcsn;
1003
1004         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1005                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1006
1007                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1008                         so->s_rid, slap_serverID ? slap_serverID : -1);
1009         }
1010
1011         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1012                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1013         if ( cookie.bv_len )
1014                 srsize += cookie.bv_len + 1;
1015         sr = ch_malloc( srsize );
1016         sr->s_next = NULL;
1017         sr->s_dn.bv_val = (char *)(sr + 1);
1018         sr->s_dn.bv_len = opc->sdn.bv_len;
1019         sr->s_mode = mode;
1020         sr->s_isreference = opc->sreference;
1021         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1022                  opc->sdn.bv_val ) + 1;
1023         sr->s_ndn.bv_len = opc->sndn.bv_len;
1024         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1025                  opc->sndn.bv_val ) + 1;
1026         sr->s_uuid.bv_len = opc->suuid.bv_len;
1027         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1028         if ( cookie.bv_len ) {
1029                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1030                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1031         } else {
1032                 sr->s_csn.bv_val = NULL;
1033         }
1034         sr->s_csn.bv_len = cookie.bv_len;
1035
1036         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1037                 ch_free( cookie.bv_val );
1038         }
1039
1040         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1041         if ( !so->s_res ) {
1042                 so->s_res = sr;
1043         } else {
1044                 so->s_restail->s_next = sr;
1045         }
1046         so->s_restail = sr;
1047
1048         /* If the base of the psearch was modified, check it next time round */
1049         if ( so->s_flags & PS_WROTE_BASE ) {
1050                 so->s_flags ^= PS_WROTE_BASE;
1051                 so->s_flags |= PS_FIND_BASE;
1052         }
1053         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1054                 syncprov_qstart( so );
1055         }
1056         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1057         return LDAP_SUCCESS;
1058 }
1059
1060 static int
1061 syncprov_drop_psearch( syncops *so, int lock )
1062 {
1063         if ( so->s_flags & PS_IS_DETACHED ) {
1064                 if ( lock )
1065                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1066                 so->s_op->o_conn->c_n_ops_executing--;
1067                 so->s_op->o_conn->c_n_ops_completed++;
1068                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1069                         o_next );
1070                 if ( lock )
1071                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1072         }
1073         syncprov_free_syncop( so );
1074
1075         return 0;
1076 }
1077
1078 static int
1079 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1080 {
1081         slap_callback *sc = op->o_callback;
1082         op->o_callback = sc->sc_next;
1083         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1084         op->o_tmpfree( sc, op->o_tmpmemctx );
1085         return 0;
1086 }
1087
1088 static int
1089 syncprov_op_abandon( Operation *op, SlapReply *rs )
1090 {
1091         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1092         syncprov_info_t         *si = on->on_bi.bi_private;
1093         syncops *so, *soprev;
1094
1095         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1096         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1097                 soprev=so, so=so->s_next ) {
1098                 if ( so->s_op->o_connid == op->o_connid &&
1099                         so->s_op->o_msgid == op->orn_msgid ) {
1100                                 so->s_op->o_abandon = 1;
1101                                 soprev->s_next = so->s_next;
1102                                 break;
1103                 }
1104         }
1105         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1106         if ( so ) {
1107                 /* Is this really a Cancel exop? */
1108                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1109                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1110                         rs->sr_err = LDAP_CANCELLED;
1111                         send_ldap_result( so->s_op, rs );
1112                         if ( so->s_flags & PS_IS_DETACHED ) {
1113                                 slap_callback *cb;
1114                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1115                                 cb->sc_cleanup = syncprov_ab_cleanup;
1116                                 cb->sc_next = op->o_callback;
1117                                 cb->sc_private = so;
1118                                 return SLAP_CB_CONTINUE;
1119                         }
1120                 }
1121                 syncprov_drop_psearch( so, 0 );
1122         }
1123         return SLAP_CB_CONTINUE;
1124 }
1125
1126 /* Find which persistent searches are affected by this operation */
1127 static void
1128 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1129 {
1130         slap_overinst *on = opc->son;
1131         syncprov_info_t         *si = on->on_bi.bi_private;
1132
1133         fbase_cookie fc;
1134         syncops *ss, *sprev, *snext;
1135         Entry *e = NULL;
1136         Attribute *a;
1137         int rc;
1138         struct berval newdn;
1139         int freefdn = 0;
1140         BackendDB *b0 = op->o_bd, db;
1141
1142         fc.fdn = &op->o_req_ndn;
1143         /* compute new DN */
1144         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1145                 struct berval pdn;
1146                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1147                 else dnParent( fc.fdn, &pdn );
1148                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1149                 fc.fdn = &newdn;
1150                 freefdn = 1;
1151         }
1152         if ( op->o_tag != LDAP_REQ_ADD ) {
1153                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1154                         db = *op->o_bd;
1155                         op->o_bd = &db;
1156                 }
1157                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1158                 /* If we're sending responses now, make a copy and unlock the DB */
1159                 if ( e && !saveit ) {
1160                         Entry *e2 = entry_dup( e );
1161                         overlay_entry_release_ov( op, e, 0, on );
1162                         e = e2;
1163                 }
1164                 if ( rc ) {
1165                         op->o_bd = b0;
1166                         return;
1167                 }
1168         } else {
1169                 e = op->ora_e;
1170         }
1171
1172         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1173                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1174                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1175                 opc->sreference = is_entry_referral( e );
1176                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1177                 if ( a )
1178                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1179         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1180                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1181                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1182                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1183                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1184         }
1185
1186         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1187         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1188                 sprev = ss, ss=snext)
1189         {
1190                 Operation op2;
1191                 Opheader oh;
1192                 syncmatches *sm;
1193                 int found = 0;
1194
1195                 snext = ss->s_next;
1196                 if ( ss->s_op->o_abandon )
1197                         continue;
1198
1199                 /* Don't send ops back to the originator */
1200                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1201                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1202                                 opc->osid, 0, 0 );
1203                         continue;
1204                 }
1205
1206                 /* Don't send ops back to the messenger */
1207                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1208                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1209                                 opc->rsid, 0, 0 );
1210                         continue;
1211                 }
1212
1213                 /* validate base */
1214                 fc.fss = ss;
1215                 fc.fbase = 0;
1216                 fc.fscope = 0;
1217
1218                 /* If the base of the search is missing, signal a refresh */
1219                 rc = syncprov_findbase( op, &fc );
1220                 if ( rc != LDAP_SUCCESS ) {
1221                         SlapReply rs = {REP_RESULT};
1222                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1223                                 "search base has changed" );
1224                         sprev->s_next = snext;
1225                         syncprov_drop_psearch( ss, 1 );
1226                         ss = sprev;
1227                         continue;
1228                 }
1229
1230
1231                 /* If we're sending results now, look for this op in old matches */
1232                 if ( !saveit ) {
1233                         syncmatches *old;
1234
1235                         /* Did we modify the search base? */
1236                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1237                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1238                                 ss->s_flags |= PS_WROTE_BASE;
1239                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1240                         }
1241
1242                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1243                                 old=sm, sm=sm->sm_next ) {
1244                                 if ( sm->sm_op == ss ) {
1245                                         found = 1;
1246                                         old->sm_next = sm->sm_next;
1247                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1248                                         break;
1249                                 }
1250                         }
1251                 }
1252
1253                 if ( fc.fscope ) {
1254                         op2 = *ss->s_op;
1255                         oh = *op->o_hdr;
1256                         oh.oh_conn = ss->s_op->o_conn;
1257                         oh.oh_connid = ss->s_op->o_connid;
1258                         op2.o_bd = op->o_bd->bd_self;
1259                         op2.o_hdr = &oh;
1260                         op2.o_extra = op->o_extra;
1261                         op2.o_callback = NULL;
1262                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1263                 }
1264
1265                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1266                         ss->s_sid, fc.fscope, rc );
1267
1268                 /* check if current o_req_dn is in scope and matches filter */
1269                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1270                         if ( saveit ) {
1271                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1272                                 sm->sm_next = opc->smatches;
1273                                 sm->sm_op = ss;
1274                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1275                                 ++ss->s_inuse;
1276                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1277                                 opc->smatches = sm;
1278                         } else {
1279                                 /* if found send UPDATE else send ADD */
1280                                 syncprov_qresp( opc, ss,
1281                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1282                         }
1283                 } else if ( !saveit && found ) {
1284                         /* send DELETE */
1285                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1286                 } else if ( !saveit ) {
1287                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1288                 }
1289                 if ( !saveit && found ) {
1290                         /* Decrement s_inuse, was incremented when called
1291                          * with saveit == TRUE
1292                          */
1293                         syncprov_free_syncop( ss );
1294                 }
1295         }
1296         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1297
1298         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1299                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1300                         op->o_bd = &db;
1301                 }
1302                 overlay_entry_release_ov( op, e, 0, on );
1303                 op->o_bd = b0;
1304         }
1305         if ( freefdn ) {
1306                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1307         }
1308         op->o_bd = b0;
1309 }
1310
1311 static int
1312 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1313 {
1314         slap_callback *cb = op->o_callback;
1315         opcookie *opc = cb->sc_private;
1316         slap_overinst *on = opc->son;
1317         syncprov_info_t         *si = on->on_bi.bi_private;
1318         syncmatches *sm, *snext;
1319         modtarget *mt, mtdummy;
1320
1321         for (sm = opc->smatches; sm; sm=snext) {
1322                 snext = sm->sm_next;
1323                 syncprov_free_syncop( sm->sm_op );
1324                 op->o_tmpfree( sm, op->o_tmpmemctx );
1325         }
1326
1327         /* Remove op from lock table */
1328         mt = opc->smt;
1329         if ( mt ) {
1330                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1331                 mt->mt_mods = mt->mt_mods->mi_next;
1332                 /* If there are more, promote the next one */
1333                 if ( mt->mt_mods ) {
1334                         mt->mt_op = mt->mt_mods->mi_op;
1335                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1336                 } else {
1337                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1338                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1339                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1340                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1341                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1342                         ch_free( mt );
1343                 }
1344         }
1345         if ( !BER_BVISNULL( &opc->suuid ))
1346                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1347         if ( !BER_BVISNULL( &opc->sndn ))
1348                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1349         if ( !BER_BVISNULL( &opc->sdn ))
1350                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1351         op->o_callback = cb->sc_next;
1352         op->o_tmpfree(cb, op->o_tmpmemctx);
1353
1354         return 0;
1355 }
1356
1357 static void
1358 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1359 {
1360         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1361         Modifications mod;
1362         Operation opm;
1363         SlapReply rsm = { 0 };
1364         slap_callback cb = {0};
1365         BackendDB be;
1366
1367 #ifdef CHECK_CSN
1368         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1369
1370         int i;
1371         for ( i=0; i<si->si_numcsns; i++ ) {
1372                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1373         }
1374 #endif
1375         mod.sml_numvals = si->si_numcsns;
1376         mod.sml_values = si->si_ctxcsn;
1377         mod.sml_nvalues = NULL;
1378         mod.sml_desc = slap_schema.si_ad_contextCSN;
1379         mod.sml_op = LDAP_MOD_REPLACE;
1380         mod.sml_flags = SLAP_MOD_INTERNAL;
1381         mod.sml_next = NULL;
1382
1383         cb.sc_response = slap_null_cb;
1384         opm = *op;
1385         opm.o_tag = LDAP_REQ_MODIFY;
1386         opm.o_callback = &cb;
1387         opm.orm_modlist = &mod;
1388         opm.orm_no_opattrs = 1;
1389         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1390                 be = *on->on_info->oi_origdb;
1391                 opm.o_bd = &be;
1392         }
1393         opm.o_req_dn = si->si_contextdn;
1394         opm.o_req_ndn = si->si_contextdn;
1395         opm.o_bd->bd_info = on->on_info->oi_orig;
1396         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1397         opm.o_no_schema_check = 1;
1398         opm.o_bd->be_modify( &opm, &rsm );
1399
1400         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1401                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1402                 const char      *text;
1403                 char txtbuf[SLAP_TEXT_BUFLEN];
1404                 size_t textlen = sizeof txtbuf;
1405                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1406                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1407                 opm.ora_e = e;
1408                 opm.o_bd->be_add( &opm, &rsm );
1409                 if ( e == opm.ora_e )
1410                         be_entry_release_w( &opm, opm.ora_e );
1411         }
1412
1413         if ( mod.sml_next != NULL ) {
1414                 slap_mods_free( mod.sml_next, 1 );
1415         }
1416 #ifdef CHECK_CSN
1417         for ( i=0; i<si->si_numcsns; i++ ) {
1418                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1419         }
1420 #endif
1421 }
1422
1423 static void
1424 syncprov_add_slog( Operation *op )
1425 {
1426         opcookie *opc = op->o_callback->sc_private;
1427         slap_overinst *on = opc->son;
1428         syncprov_info_t         *si = on->on_bi.bi_private;
1429         sessionlog *sl;
1430         slog_entry *se;
1431
1432         sl = si->si_logs;
1433         {
1434                 /* Allocate a record. UUIDs are not NUL-terminated. */
1435                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1436                         op->o_csn.bv_len + 1 );
1437                 se->se_next = NULL;
1438                 se->se_tag = op->o_tag;
1439
1440                 se->se_uuid.bv_val = (char *)(&se[1]);
1441                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1442                 se->se_uuid.bv_len = opc->suuid.bv_len;
1443
1444                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1445                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1446                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1447                 se->se_csn.bv_len = op->o_csn.bv_len;
1448                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1449
1450                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1451                 if ( sl->sl_head ) {
1452                         sl->sl_tail->se_next = se;
1453                 } else {
1454                         sl->sl_head = se;
1455                 }
1456                 sl->sl_tail = se;
1457                 sl->sl_num++;
1458                 while ( sl->sl_num > sl->sl_size ) {
1459                         se = sl->sl_head;
1460                         sl->sl_head = se->se_next;
1461                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1462                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1463                         ch_free( se );
1464                         sl->sl_num--;
1465                 }
1466                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1467         }
1468 }
1469
1470 /* Just set a flag if we found the matching entry */
1471 static int
1472 playlog_cb( Operation *op, SlapReply *rs )
1473 {
1474         if ( rs->sr_type == REP_SEARCH ) {
1475                 op->o_callback->sc_private = (void *)1;
1476         }
1477         return rs->sr_err;
1478 }
1479
1480 /* enter with sl->sl_mutex locked, release before returning */
1481 static void
1482 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1483         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1484 {
1485         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1486         slog_entry *se;
1487         int i, j, ndel, num, nmods, mmods;
1488         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1489         BerVarray uuids;
1490         struct berval delcsn[2];
1491
1492         if ( !sl->sl_num ) {
1493                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1494                 return;
1495         }
1496
1497         num = sl->sl_num;
1498         i = 0;
1499         nmods = 0;
1500
1501         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1502                 num * UUID_LEN, op->o_tmpmemctx );
1503         uuids[0].bv_val = (char *)(uuids + num + 1);
1504
1505         delcsn[0].bv_len = 0;
1506         delcsn[0].bv_val = cbuf;
1507         BER_BVZERO(&delcsn[1]);
1508
1509         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1510          * and everything else at the end. Do this first so we can
1511          * unlock the list mutex.
1512          */
1513         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1514                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1515         for ( se=sl->sl_head; se; se=se->se_next ) {
1516                 int k;
1517                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1518                 ndel = 1;
1519                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1520                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1521                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1522                                 break;
1523                         }
1524                 }
1525                 if ( ndel <= 0 ) {
1526                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1527                         continue;
1528                 }
1529                 ndel = 0;
1530                 for ( k=0; k<numcsns; k++ ) {
1531                         if ( se->se_sid == sids[k] ) {
1532                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1533                                 break;
1534                         }
1535                 }
1536                 if ( ndel > 0 ) {
1537                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1538                         break;
1539                 }
1540                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1541                         j = i;
1542                         i++;
1543                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1544                         delcsn[0].bv_len = se->se_csn.bv_len;
1545                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1546                 } else {
1547                         nmods++;
1548                         j = num - nmods;
1549                 }
1550                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1551                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1552                 uuids[j].bv_len = UUID_LEN;
1553         }
1554         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1555
1556         ndel = i;
1557
1558         /* Zero out unused slots */
1559         for ( i=ndel; i < num - nmods; i++ )
1560                 uuids[i].bv_len = 0;
1561
1562         /* Mods must be validated to see if they belong in this delete set.
1563          */
1564
1565         mmods = nmods;
1566         /* Strip any duplicates */
1567         for ( i=0; i<nmods; i++ ) {
1568                 for ( j=0; j<ndel; j++ ) {
1569                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1570                                 uuids[num - 1 - i].bv_len = 0;
1571                                 mmods --;
1572                                 break;
1573                         }
1574                 }
1575                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1576                 for ( j=0; j<i; j++ ) {
1577                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1578                                 uuids[num - 1 - i].bv_len = 0;
1579                                 mmods --;
1580                                 break;
1581                         }
1582                 }
1583         }
1584
1585         if ( mmods ) {
1586                 Operation fop;
1587                 SlapReply frs = { REP_RESULT };
1588                 int rc;
1589                 Filter mf, af;
1590                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1591                 slap_callback cb = {0};
1592
1593                 fop = *op;
1594
1595                 fop.o_sync_mode = 0;
1596                 fop.o_callback = &cb;
1597                 fop.ors_limit = NULL;
1598                 fop.ors_tlimit = SLAP_NO_LIMIT;
1599                 fop.ors_attrs = slap_anlist_all_attributes;
1600                 fop.ors_attrsonly = 0;
1601                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1602
1603                 af.f_choice = LDAP_FILTER_AND;
1604                 af.f_next = NULL;
1605                 af.f_and = &mf;
1606                 mf.f_choice = LDAP_FILTER_EQUALITY;
1607                 mf.f_ava = &eq;
1608                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1609                 mf.f_next = fop.ors_filter;
1610
1611                 fop.ors_filter = &af;
1612
1613                 cb.sc_response = playlog_cb;
1614                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1615
1616                 for ( i=ndel; i<num; i++ ) {
1617                         if ( uuids[i].bv_len == 0 ) continue;
1618
1619                         mf.f_av_value = uuids[i];
1620                         cb.sc_private = NULL;
1621                         fop.ors_slimit = 1;
1622                         frs.sr_nentries = 0;
1623                         rc = fop.o_bd->be_search( &fop, &frs );
1624
1625                         /* If entry was not found, add to delete list */
1626                         if ( !cb.sc_private ) {
1627                                 uuids[ndel++] = uuids[i];
1628                         }
1629                 }
1630                 fop.o_bd->bd_info = (BackendInfo *)on;
1631         }
1632         if ( ndel ) {
1633                 struct berval cookie;
1634
1635                 if ( delcsn[0].bv_len ) {
1636                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1637                                 slap_serverID ? slap_serverID : -1 );
1638
1639                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1640                 }
1641
1642                 uuids[ndel].bv_val = NULL;
1643                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1644                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1645                 if ( delcsn[0].bv_len ) {
1646                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1647                 }
1648         }
1649         op->o_tmpfree( uuids, op->o_tmpmemctx );
1650 }
1651
1652 static int
1653 syncprov_op_response( Operation *op, SlapReply *rs )
1654 {
1655         opcookie *opc = op->o_callback->sc_private;
1656         slap_overinst *on = opc->son;
1657         syncprov_info_t         *si = on->on_bi.bi_private;
1658         syncmatches *sm;
1659
1660         if ( rs->sr_err == LDAP_SUCCESS )
1661         {
1662                 struct berval maxcsn;
1663                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1664                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1665
1666                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1667
1668                 /* Update our context CSN */
1669                 cbuf[0] = '\0';
1670                 maxcsn.bv_val = cbuf;
1671                 maxcsn.bv_len = sizeof(cbuf);
1672                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1673
1674                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1675                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1676                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1677                         /* Catch contextCSN updates from syncrepl. We have to look at
1678                          * all the attribute values, as there may be more than one csn
1679                          * that changed, and only one can be passed in the csn queue.
1680                          */
1681                         Modifications *mod = op->orm_modlist;
1682                         int i, j, sid;
1683
1684                         for ( i=0; i<mod->sml_numvals; i++ ) {
1685                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1686
1687                                 for ( j=0; j<si->si_numcsns; j++ ) {
1688                                         if ( sid == si->si_sids[j] ) {
1689                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1690                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1691                                                         csn_changed = 1;
1692                                                 }
1693                                                 break;
1694                                         }
1695                                 }
1696
1697                                 if ( j == si->si_numcsns ) {
1698                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1699                                         si->si_numcsns++;
1700                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1701                                                 sizeof(int));
1702                                         si->si_sids[j] = sid;
1703                                         csn_changed = 1;
1704                                 }
1705                         }
1706                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1707
1708                         if ( csn_changed ) {
1709                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1710                                 have_psearches = ( si->si_ops != NULL );
1711                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1712
1713                                 if ( have_psearches ) {
1714                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1715                                                 if ( sm->sm_op->s_op->o_abandon )
1716                                                         continue;
1717                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1718                                         }
1719                                 }
1720                         }
1721                         goto leave;
1722                 }
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 #if 0
1764                 } else if ( !foundit ) {
1765                         /* internal ops that aren't meant to be replicated */
1766                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1767                         return SLAP_CB_CONTINUE;
1768 #endif
1769                 }
1770
1771                 /* Don't do any processing for consumer contextCSN updates */
1772                 if ( op->o_dont_replicate ) {
1773                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1774                         goto leave;
1775                 }
1776
1777                 si->si_numops++;
1778                 if ( si->si_chkops || si->si_chktime ) {
1779                         /* Never checkpoint adding the context entry,
1780                          * it will deadlock
1781                          */
1782                         if ( op->o_tag != LDAP_REQ_ADD ||
1783                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1784                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1785                                         do_check = 1;
1786                                         si->si_numops = 0;
1787                                 }
1788                                 if ( si->si_chktime &&
1789                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1790                                         if ( si->si_chklast ) {
1791                                                 do_check = 1;
1792                                                 si->si_chklast = op->o_time;
1793                                         } else {
1794                                                 si->si_chklast = 1;
1795                                         }
1796                                 }
1797                         }
1798                 }
1799                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1800
1801                 if ( do_check ) {
1802                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1803                         syncprov_checkpoint( op, rs, on );
1804                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1805                 }
1806
1807                 /* only update consumer ctx if this is a newer csn */
1808                 if ( csn_changed ) {
1809                         opc->sctxcsn = maxcsn;
1810                 }
1811
1812                 /* Handle any persistent searches */
1813                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1814                 have_psearches = ( si->si_ops != NULL );
1815                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1816                 if ( have_psearches ) {
1817                         switch(op->o_tag) {
1818                         case LDAP_REQ_ADD:
1819                         case LDAP_REQ_MODIFY:
1820                         case LDAP_REQ_MODRDN:
1821                         case LDAP_REQ_EXTENDED:
1822                                 syncprov_matchops( op, opc, 0 );
1823                                 break;
1824                         case LDAP_REQ_DELETE:
1825                                 /* for each match in opc->smatches:
1826                                  *   send DELETE msg
1827                                  */
1828                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1829                                         if ( sm->sm_op->s_op->o_abandon )
1830                                                 continue;
1831                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1832                                 }
1833                                 break;
1834                         }
1835                 }
1836
1837                 /* Add any log records */
1838                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1839                         syncprov_add_slog( op );
1840                 }
1841 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1842         }
1843         return SLAP_CB_CONTINUE;
1844 }
1845
1846 /* We don't use a subentry to store the context CSN any more.
1847  * We expose the current context CSN as an operational attribute
1848  * of the suffix entry.
1849  */
1850 static int
1851 syncprov_op_compare( Operation *op, SlapReply *rs )
1852 {
1853         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1854         syncprov_info_t         *si = on->on_bi.bi_private;
1855         int rc = SLAP_CB_CONTINUE;
1856
1857         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1858                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1859         {
1860                 Entry e = {0};
1861                 Attribute a = {0};
1862
1863                 e.e_name = si->si_contextdn;
1864                 e.e_nname = si->si_contextdn;
1865                 e.e_attrs = &a;
1866
1867                 a.a_desc = slap_schema.si_ad_contextCSN;
1868
1869                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1870
1871                 a.a_vals = si->si_ctxcsn;
1872                 a.a_nvals = a.a_vals;
1873                 a.a_numvals = si->si_numcsns;
1874
1875                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1876                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1877                 if ( ! rs->sr_err ) {
1878                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1879                         goto return_results;
1880                 }
1881
1882                 if ( get_assert( op ) &&
1883                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1884                 {
1885                         rs->sr_err = LDAP_ASSERTION_FAILED;
1886                         goto return_results;
1887                 }
1888
1889
1890                 rs->sr_err = LDAP_COMPARE_FALSE;
1891
1892                 if ( attr_valfind( &a,
1893                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1894                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1895                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1896                 {
1897                         rs->sr_err = LDAP_COMPARE_TRUE;
1898                 }
1899
1900 return_results:;
1901
1902                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1903
1904                 send_ldap_result( op, rs );
1905
1906                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1907                         rs->sr_err = LDAP_SUCCESS;
1908                 }
1909                 rc = rs->sr_err;
1910         }
1911
1912         return rc;
1913 }
1914
1915 static int
1916 syncprov_op_mod( Operation *op, SlapReply *rs )
1917 {
1918         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1919         syncprov_info_t         *si = on->on_bi.bi_private;
1920         slap_callback *cb;
1921         opcookie *opc;
1922         int have_psearches, cbsize;
1923
1924         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1925         have_psearches = ( si->si_ops != NULL );
1926         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1927
1928         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1929                 (have_psearches ? sizeof(modinst) : 0 );
1930
1931         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1932         opc = (opcookie *)(cb+1);
1933         opc->son = on;
1934         cb->sc_response = syncprov_op_response;
1935         cb->sc_cleanup = syncprov_op_cleanup;
1936         cb->sc_private = opc;
1937         cb->sc_next = op->o_callback;
1938         op->o_callback = cb;
1939
1940         opc->osid = -1;
1941         opc->rsid = -1;
1942         if ( op->o_csn.bv_val ) {
1943                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1944         }
1945         if ( op->o_controls ) {
1946                 struct sync_cookie *scook =
1947                 op->o_controls[slap_cids.sc_LDAPsync];
1948                 if ( scook )
1949                         opc->rsid = scook->sid;
1950         }
1951
1952         /* If there are active persistent searches, lock this operation.
1953          * See seqmod.c for the locking logic on its own.
1954          */
1955         if ( have_psearches ) {
1956                 modtarget *mt, mtdummy;
1957                 modinst *mi;
1958
1959                 mi = (modinst *)(opc+1);
1960                 mi->mi_op = op;
1961
1962                 /* See if we're already modifying this entry... */
1963                 mtdummy.mt_op = op;
1964                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1965                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1966                 if ( mt ) {
1967                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1968                         if ( mt->mt_mods == NULL ) {
1969                                 /* Cannot reuse this mt, as another thread is about
1970                                  * to release it in syncprov_op_cleanup.
1971                                  */
1972                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1973                                 mt = NULL;
1974                         }
1975                 }
1976                 if ( mt ) {
1977                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1978                         mt->mt_tail->mi_next = mi;
1979                         mt->mt_tail = mi;
1980                         /* wait for this op to get to head of list */
1981                         while ( mt->mt_mods != mi ) {
1982                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1983                                 /* FIXME: if dynamic config can delete overlays or
1984                                  * databases we'll have to check for cleanup here.
1985                                  * Currently it's not an issue because there are
1986                                  * no dynamic config deletes...
1987                                  */
1988                                 if ( slapd_shutdown )
1989                                         return SLAPD_ABANDON;
1990
1991                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1992                                         ldap_pvt_thread_yield();
1993                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1994
1995                                 /* clean up if the caller is giving up */
1996                                 if ( op->o_abandon ) {
1997                                         modinst *m2;
1998                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1999                                                 m2 = m2->mi_next );
2000                                         m2->mi_next = mi->mi_next;
2001                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2002                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2003                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2004                                         return SLAPD_ABANDON;
2005                                 }
2006                         }
2007                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2008                 } else {
2009                         /* Record that we're modifying this entry now */
2010                         mt = ch_malloc( sizeof(modtarget) );
2011                         mt->mt_mods = mi;
2012                         mt->mt_tail = mi;
2013                         mt->mt_op = mi->mi_op;
2014                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2015                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2016                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2017                 }
2018                 opc->smt = mt;
2019         }
2020
2021         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2022                 syncprov_matchops( op, opc, 1 );
2023
2024         return SLAP_CB_CONTINUE;
2025 }
2026
2027 static int
2028 syncprov_op_extended( Operation *op, SlapReply *rs )
2029 {
2030         if ( exop_is_write( op ))
2031                 return syncprov_op_mod( op, rs );
2032
2033         return SLAP_CB_CONTINUE;
2034 }
2035
2036 typedef struct searchstate {
2037         slap_overinst *ss_on;
2038         syncops *ss_so;
2039         BerVarray ss_ctxcsn;
2040         int *ss_sids;
2041         int ss_numcsns;
2042 #define SS_PRESENT      0x01
2043 #define SS_CHANGED      0x02
2044         int ss_flags;
2045 } searchstate;
2046
2047 static int
2048 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2049 {
2050         if ( rs->sr_ctrls ) {
2051                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2052                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2053                 rs->sr_ctrls = NULL;
2054         }
2055         return 0;
2056 }
2057
2058 typedef struct SyncOperationBuffer {
2059         Operation               sob_op;
2060         Opheader                sob_hdr;
2061         OpExtra                 sob_oe;
2062         AttributeName   sob_extra;      /* not always present */
2063         /* Further data allocated here */
2064 } SyncOperationBuffer;
2065
2066 static void
2067 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2068 {
2069         SyncOperationBuffer *sopbuf2;
2070         Operation *op2;
2071         int i, alen = 0;
2072         size_t size;
2073         char *ptr;
2074         GroupAssertion *g1, *g2;
2075
2076         /* count the search attrs */
2077         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2078                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2079         }
2080         /* Make a new copy of the operation */
2081         size = offsetof( SyncOperationBuffer, sob_extra ) +
2082                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2083                 op->o_req_dn.bv_len + 1 +
2084                 op->o_req_ndn.bv_len + 1 +
2085                 op->o_ndn.bv_len + 1 +
2086                 so->s_filterstr.bv_len + 1;
2087         sopbuf2 = ch_calloc( 1, size );
2088         op2 = &sopbuf2->sob_op;
2089         op2->o_hdr = &sopbuf2->sob_hdr;
2090         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2091
2092         /* Copy the fields we care about explicitly, leave the rest alone */
2093         *op2->o_hdr = *op->o_hdr;
2094         op2->o_tag = op->o_tag;
2095         op2->o_time = op->o_time;
2096         op2->o_bd = on->on_info->oi_origdb;
2097         op2->o_request = op->o_request;
2098         op2->o_managedsait = op->o_managedsait;
2099         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2100         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2101
2102         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2103         if ( i ) {
2104                 op2->ors_attrs = (AttributeName *) ptr;
2105                 ptr = (char *) &op2->ors_attrs[i+1];
2106                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2107                         op2->ors_attrs[i] = op->ors_attrs[i];
2108                         op2->ors_attrs[i].an_name.bv_val = ptr;
2109                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2110                 }
2111                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2112         }
2113
2114         op2->o_authz = op->o_authz;
2115         op2->o_ndn.bv_val = ptr;
2116         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2117         op2->o_dn = op2->o_ndn;
2118         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2119         op2->o_req_dn.bv_val = ptr;
2120         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2121         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2122         op2->o_req_ndn.bv_val = ptr;
2123         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2124         op2->ors_filterstr.bv_val = ptr;
2125         strcpy( ptr, so->s_filterstr.bv_val );
2126         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2127
2128         /* Skip the AND/GE clause that we stuck on in front */
2129         if ( so->s_flags & PS_FIX_FILTER ) {
2130                 op2->ors_filter = op->ors_filter->f_and->f_next;
2131                 so->s_flags ^= PS_FIX_FILTER;
2132         } else {
2133                 op2->ors_filter = op->ors_filter;
2134         }
2135         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2136         so->s_op = op2;
2137
2138         /* Copy any cached group ACLs individually */
2139         op2->o_groups = NULL;
2140         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2141                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2142                 *g2 = *g1;
2143                 strcpy( g2->ga_ndn, g1->ga_ndn );
2144                 g2->ga_next = op2->o_groups;
2145                 op2->o_groups = g2;
2146         }
2147         /* Don't allow any further group caching */
2148         op2->o_do_not_cache = 1;
2149
2150         /* Add op2 to conn so abandon will find us */
2151         op->o_conn->c_n_ops_executing++;
2152         op->o_conn->c_n_ops_completed--;
2153         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2154         so->s_flags |= PS_IS_DETACHED;
2155
2156         /* Prevent anyone else from trying to send a result for this op */
2157         op->o_abandon = 1;
2158 }
2159
2160 static int
2161 syncprov_search_response( Operation *op, SlapReply *rs )
2162 {
2163         searchstate *ss = op->o_callback->sc_private;
2164         slap_overinst *on = ss->ss_on;
2165         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2166         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2167
2168         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2169                 Attribute *a;
2170                 /* If we got a referral without a referral object, there's
2171                  * something missing that we cannot replicate. Just ignore it.
2172                  * The consumer will abort because we didn't send the expected
2173                  * control.
2174                  */
2175                 if ( !rs->sr_entry ) {
2176                         assert( rs->sr_entry != NULL );
2177                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2178                         return SLAP_CB_CONTINUE;
2179                 }
2180                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2181                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2182                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2183                 }
2184                 if ( a ) {
2185                         int i, sid;
2186                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2187
2188                         /* Don't send changed entries back to the originator */
2189                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2190                                 Debug( LDAP_DEBUG_SYNC,
2191                                         "Entry %s changed by peer, ignored\n",
2192                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2193                                 return LDAP_SUCCESS;
2194                         }
2195
2196                         /* If not a persistent search */
2197                         if ( !ss->ss_so ) {
2198                                 /* Make sure entry is less than the snapshot'd contextCSN */
2199                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2200                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2201                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2202                                                 Debug( LDAP_DEBUG_SYNC,
2203                                                         "Entry %s CSN %s greater than snapshot %s\n",
2204                                                         rs->sr_entry->e_name.bv_val,
2205                                                         a->a_nvals[0].bv_val,
2206                                                         ss->ss_ctxcsn[i].bv_val );
2207                                                 return LDAP_SUCCESS;
2208                                         }
2209                                 }
2210                         }
2211
2212                         /* Don't send old entries twice */
2213                         if ( srs->sr_state.ctxcsn ) {
2214                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2215                                         if ( sid == srs->sr_state.sids[i] &&
2216                                                 ber_bvcmp( &a->a_nvals[0],
2217                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2218                                                 Debug( LDAP_DEBUG_SYNC,
2219                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2220                                                         rs->sr_entry->e_name.bv_val,
2221                                                         a->a_nvals[0].bv_val,
2222                                                         srs->sr_state.ctxcsn[i].bv_val );
2223                                                 return LDAP_SUCCESS;
2224                                         }
2225                                 }
2226                         }
2227                 }
2228                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2229                         op->o_tmpmemctx );
2230                 rs->sr_ctrls[1] = NULL;
2231                 /* If we're in delta-sync mode, always send a cookie */
2232                 if ( si->si_nopres && si->si_usehint && a ) {
2233                         struct berval cookie;
2234                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2235                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2236                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2237                 } else {
2238                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2239                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2240                 }
2241         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2242                 struct berval cookie = BER_BVNULL;
2243
2244                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2245                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2246                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2247                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2248
2249                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2250                 }
2251
2252                 /* Is this a regular refresh?
2253                  * Note: refresh never gets here if there were no changes
2254                  */
2255                 if ( !ss->ss_so ) {
2256                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2257                                 op->o_tmpmemctx );
2258                         rs->sr_ctrls[1] = NULL;
2259                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2260                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2261                                         LDAP_SYNC_REFRESH_DELETES );
2262                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2263                 } else {
2264                 /* It's RefreshAndPersist, transition to Persist phase */
2265                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2266                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2267                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2268                                 1, NULL, 0 );
2269                         if ( !BER_BVISNULL( &cookie ))
2270                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2271
2272                         /* Detach this Op from frontend control */
2273                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2274
2275                         /* But not if this connection was closed along the way */
2276                         if ( op->o_abandon ) {
2277                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2278                                 /* syncprov_ab_cleanup will free this syncop */
2279                                 return SLAPD_ABANDON;
2280
2281                         } else {
2282                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2283                                 /* Turn off the refreshing flag */
2284                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2285
2286                                 syncprov_detach_op( op, ss->ss_so, on );
2287
2288                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2289
2290                                 /* If there are queued responses, fire them off */
2291                                 if ( ss->ss_so->s_res )
2292                                         syncprov_qstart( ss->ss_so );
2293                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2294                         }
2295
2296                         return LDAP_SUCCESS;
2297                 }
2298         }
2299
2300         return SLAP_CB_CONTINUE;
2301 }
2302
2303 static int
2304 syncprov_op_search( Operation *op, SlapReply *rs )
2305 {
2306         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2307         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2308         slap_callback   *cb;
2309         int gotstate = 0, changed = 0, do_present = 0;
2310         syncops *sop = NULL;
2311         searchstate *ss;
2312         sync_control *srs;
2313         BerVarray ctxcsn;
2314         int i, *sids, numcsns;
2315         struct berval mincsn;
2316
2317         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2318
2319         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2320                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2321                 return rs->sr_err;
2322         }
2323
2324         srs = op->o_controls[slap_cids.sc_LDAPsync];
2325
2326         /* If this is a persistent search, set it up right away */
2327         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2328                 syncops so = {0};
2329                 fbase_cookie fc;
2330                 opcookie opc;
2331                 slap_callback sc;
2332
2333                 fc.fss = &so;
2334                 fc.fbase = 0;
2335                 so.s_eid = NOID;
2336                 so.s_op = op;
2337                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2338                 /* syncprov_findbase expects to be called as a callback... */
2339                 sc.sc_private = &opc;
2340                 opc.son = on;
2341                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2342                 cb = op->o_callback;
2343                 op->o_callback = &sc;
2344                 rs->sr_err = syncprov_findbase( op, &fc );
2345                 op->o_callback = cb;
2346                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2347
2348                 if ( rs->sr_err != LDAP_SUCCESS ) {
2349                         send_ldap_result( op, rs );
2350                         return rs->sr_err;
2351                 }
2352                 sop = ch_malloc( sizeof( syncops ));
2353                 *sop = so;
2354                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2355                 sop->s_rid = srs->sr_state.rid;
2356                 sop->s_sid = srs->sr_state.sid;
2357                 sop->s_inuse = 1;
2358
2359                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2360                 sop->s_next = si->si_ops;
2361                 si->si_ops = sop;
2362                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2363         }
2364
2365         /* snapshot the ctxcsn */
2366         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2367         numcsns = si->si_numcsns;
2368         if ( numcsns ) {
2369                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2370                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2371                 for ( i=0; i<numcsns; i++ )
2372                         sids[i] = si->si_sids[i];
2373         } else {
2374                 ctxcsn = NULL;
2375                 sids = NULL;
2376         }
2377         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2378
2379         /* If we have a cookie, handle the PRESENT lookups */
2380         if ( srs->sr_state.ctxcsn ) {
2381                 sessionlog *sl;
2382                 int i, j;
2383
2384                 /* If we don't have any CSN of our own yet, pretend nothing
2385                  * has changed.
2386                  */
2387                 if ( !numcsns )
2388                         goto no_change;
2389
2390                 if ( !si->si_nopres )
2391                         do_present = SS_PRESENT;
2392
2393                 /* If there are SIDs we don't recognize in the cookie, drop them */
2394                 for (i=0; i<srs->sr_state.numcsns; ) {
2395                         for (j=0; j<numcsns; j++) {
2396                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2397                                         break;
2398                                 }
2399                         }
2400                         /* not found */
2401                         if ( j == numcsns ) {
2402                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2403                                 j = srs->sr_state.numcsns - 1;
2404                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2405                                 tmp.bv_len = 0;
2406                                 srs->sr_state.ctxcsn[j] = tmp;
2407                                 srs->sr_state.numcsns = j;
2408                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2409                                 continue;
2410                         }
2411                         i++;
2412                 }
2413
2414                 /* Find the smallest CSN */
2415                 mincsn = srs->sr_state.ctxcsn[0];
2416                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2417                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2418                                 mincsn = srs->sr_state.ctxcsn[i];
2419                 }
2420
2421                 /* If nothing has changed, shortcut it */
2422                 if ( srs->sr_state.numcsns == numcsns ) {
2423                         int i, j, newer;
2424                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2425                                 for ( j=0; j<numcsns; j++ ) {
2426                                         if ( srs->sr_state.sids[i] != sids[j] )
2427                                                 continue;
2428                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2429                                         /* If our state is newer, tell consumer about changes */
2430                                         if ( newer < 0 )
2431                                                 changed = SS_CHANGED;
2432                                         else if ( newer > 0 ) {
2433                                         /* our state is older, tell consumer nothing */
2434                                                 if ( sop ) {
2435                                                         syncops **sp = &si->si_ops;
2436
2437                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2438                                                         while ( *sp != sop )
2439                                                                 sp = &(*sp)->s_next;
2440                                                         *sp = sop->s_next;
2441                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2442                                                         ch_free( sop );
2443                                                 }
2444                                                 rs->sr_err = LDAP_SUCCESS;
2445                                                 rs->sr_ctrls = NULL;
2446                                                 send_ldap_result( op, rs );
2447                                                 return rs->sr_err;
2448                                         }
2449                                         break;
2450                                 }
2451                                 if ( changed )
2452                                         break;
2453                         }
2454                         if ( !changed ) {
2455                                 do_present = 0;
2456 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2457                                         LDAPControl     *ctrls[2];
2458
2459                                         ctrls[0] = NULL;
2460                                         ctrls[1] = NULL;
2461                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2462                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2463                                         rs->sr_ctrls = ctrls;
2464                                         rs->sr_err = LDAP_SUCCESS;
2465                                         send_ldap_result( op, rs );
2466                                         rs->sr_ctrls = NULL;
2467                                         return rs->sr_err;
2468                                 }
2469                                 goto shortcut;
2470                         }
2471                 } else {
2472                         /* consumer doesn't have the right number of CSNs */
2473                         changed = SS_CHANGED;
2474                 }
2475                 /* Do we have a sessionlog for this search? */
2476                 sl=si->si_logs;
2477                 if ( sl ) {
2478                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2479                         /* Are there any log entries, and is the consumer state
2480                          * present in the session log?
2481                          */
2482                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2483                                 do_present = 0;
2484                                 /* mutex is unlocked in playlog */
2485                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2486                         } else {
2487                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2488                         }
2489                 }
2490                 /* Is the CSN still present in the database? */
2491                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2492                         /* No, so a reload is required */
2493                         /* the 2.2 consumer doesn't send this hint */
2494                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2495                                 if ( ctxcsn )
2496                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2497                                 if ( sids )
2498                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2499                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2500                                 return rs->sr_err;
2501                         }
2502                         if ( srs->sr_state.ctxcsn ) {
2503                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2504                                 srs->sr_state.ctxcsn = NULL;
2505                         }
2506                         if ( srs->sr_state.sids ) {
2507                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2508                                 srs->sr_state.sids = NULL;
2509                         }
2510                         srs->sr_state.numcsns = 0;
2511                 } else {
2512                         gotstate = 1;
2513                         /* If changed and doing Present lookup, send Present UUIDs */
2514                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2515                                 LDAP_SUCCESS ) {
2516                                 if ( ctxcsn )
2517                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2518                                 if ( sids )
2519                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2520                                 send_ldap_result( op, rs );
2521                                 return rs->sr_err;
2522                         }
2523                 }
2524         } else {
2525                 /* No consumer state, assume something has changed */
2526                 changed = SS_CHANGED;
2527         }
2528
2529 shortcut:
2530         /* Append CSN range to search filter, save original filter
2531          * for persistent search evaluation
2532          */
2533         if ( sop ) {
2534                 sop->s_filterstr= op->ors_filterstr;
2535         }
2536
2537         /* If something changed, find the changes */
2538         if ( gotstate && changed ) {
2539                 Filter *fand, *fava;
2540
2541                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2542                 fand->f_choice = LDAP_FILTER_AND;
2543                 fand->f_next = NULL;
2544                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2545                 fand->f_and = fava;
2546                 fava->f_choice = LDAP_FILTER_GE;
2547                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2548                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2549 #ifdef LDAP_COMP_MATCH
2550                 fava->f_ava->aa_cf = NULL;
2551 #endif
2552                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2553                 fava->f_next = op->ors_filter;
2554                 op->ors_filter = fand;
2555                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2556                 if ( sop )
2557                         sop->s_flags |= PS_FIX_FILTER;
2558         }
2559
2560         /* Let our callback add needed info to returned entries */
2561         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2562         ss = (searchstate *)(cb+1);
2563         ss->ss_on = on;
2564         ss->ss_so = sop;
2565         ss->ss_flags = do_present | changed;
2566         ss->ss_ctxcsn = ctxcsn;
2567         ss->ss_numcsns = numcsns;
2568         ss->ss_sids = sids;
2569         cb->sc_response = syncprov_search_response;
2570         cb->sc_cleanup = syncprov_search_cleanup;
2571         cb->sc_private = ss;
2572         cb->sc_next = op->o_callback;
2573         op->o_callback = cb;
2574
2575         /* If this is a persistent search and no changes were reported during
2576          * the refresh phase, just invoke the response callback to transition
2577          * us into persist phase
2578          */
2579         if ( !changed ) {
2580                 rs->sr_err = LDAP_SUCCESS;
2581                 rs->sr_nentries = 0;
2582                 send_ldap_result( op, rs );
2583                 return rs->sr_err;
2584         }
2585         return SLAP_CB_CONTINUE;
2586 }
2587
2588 static int
2589 syncprov_operational(
2590         Operation *op,
2591         SlapReply *rs )
2592 {
2593         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2594         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2595
2596         /* This prevents generating unnecessarily; frontend will strip
2597          * any statically stored copy.
2598          */
2599         if ( op->o_sync != SLAP_CONTROL_NONE )
2600                 return SLAP_CB_CONTINUE;
2601
2602         if ( rs->sr_entry &&
2603                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2604
2605                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2606                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2607                         Attribute *a, **ap = NULL;
2608
2609                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2610                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2611                                         break;
2612                         }
2613
2614                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2615                         if ( si->si_ctxcsn ) {
2616                                 if ( !a ) {
2617                                         for ( ap = &rs->sr_operational_attrs; *ap;
2618                                                 ap=&(*ap)->a_next );
2619
2620                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2621                                         *ap = a;
2622                                 }
2623
2624                                 if ( !ap ) {
2625                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2626                                                 Entry *e = entry_dup( rs->sr_entry );
2627                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2628                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2629                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2630                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2631                                                         entry_free( rs->sr_entry );
2632                                                 }
2633                                                 rs->sr_entry = e;
2634                                                 rs->sr_flags |=
2635                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2636                                                 a = attr_find( rs->sr_entry->e_attrs,
2637                                                         slap_schema.si_ad_contextCSN );
2638                                         }
2639                                         if ( a->a_nvals != a->a_vals ) {
2640                                                 ber_bvarray_free( a->a_nvals );
2641                                         }
2642                                         a->a_nvals = NULL;
2643                                         ber_bvarray_free( a->a_vals );
2644                                         a->a_vals = NULL;
2645                                         a->a_numvals = 0;
2646                                 }
2647                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2648                         }
2649                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2650                 }
2651         }
2652         return SLAP_CB_CONTINUE;
2653 }
2654
2655 enum {
2656         SP_CHKPT = 1,
2657         SP_SESSL,
2658         SP_NOPRES,
2659         SP_USEHINT
2660 };
2661
2662 static ConfigDriver sp_cf_gen;
2663
2664 static ConfigTable spcfg[] = {
2665         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2666                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2667                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2668                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2669         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2670                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2671                         "DESC 'Session log size in ops' "
2672                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2673         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2674                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2675                         "DESC 'Omit Present phase processing' "
2676                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2677         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2678                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2679                         "DESC 'Observe Reload Hint in Request control' "
2680                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2681         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2682 };
2683
2684 static ConfigOCs spocs[] = {
2685         { "( OLcfgOvOc:1.1 "
2686                 "NAME 'olcSyncProvConfig' "
2687                 "DESC 'SyncRepl Provider configuration' "
2688                 "SUP olcOverlayConfig "
2689                 "MAY ( olcSpCheckpoint "
2690                         "$ olcSpSessionlog "
2691                         "$ olcSpNoPresent "
2692                         "$ olcSpReloadHint "
2693                 ") )",
2694                         Cft_Overlay, spcfg },
2695         { NULL, 0, NULL }
2696 };
2697
2698 static int
2699 sp_cf_gen(ConfigArgs *c)
2700 {
2701         slap_overinst           *on = (slap_overinst *)c->bi;
2702         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2703         int rc = 0;
2704
2705         if ( c->op == SLAP_CONFIG_EMIT ) {
2706                 switch ( c->type ) {
2707                 case SP_CHKPT:
2708                         if ( si->si_chkops || si->si_chktime ) {
2709                                 struct berval bv;
2710                                 /* we assume si_chktime is a multiple of 60
2711                                  * because the parsed value was originally
2712                                  * multiplied by 60 */
2713                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2714                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2715                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2716                                         rc = 1;
2717                                 } else {
2718                                         bv.bv_val = c->cr_msg;
2719                                         value_add_one( &c->rvalue_vals, &bv );
2720                                 }
2721                         } else {
2722                                 rc = 1;
2723                         }
2724                         break;
2725                 case SP_SESSL:
2726                         if ( si->si_logs ) {
2727                                 c->value_int = si->si_logs->sl_size;
2728                         } else {
2729                                 rc = 1;
2730                         }
2731                         break;
2732                 case SP_NOPRES:
2733                         if ( si->si_nopres ) {
2734                                 c->value_int = 1;
2735                         } else {
2736                                 rc = 1;
2737                         }
2738                         break;
2739                 case SP_USEHINT:
2740                         if ( si->si_usehint ) {
2741                                 c->value_int = 1;
2742                         } else {
2743                                 rc = 1;
2744                         }
2745                         break;
2746                 }
2747                 return rc;
2748         } else if ( c->op == LDAP_MOD_DELETE ) {
2749                 switch ( c->type ) {
2750                 case SP_CHKPT:
2751                         si->si_chkops = 0;
2752                         si->si_chktime = 0;
2753                         break;
2754                 case SP_SESSL:
2755                         if ( si->si_logs )
2756                                 si->si_logs->sl_size = 0;
2757                         else
2758                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2759                         break;
2760                 case SP_NOPRES:
2761                         if ( si->si_nopres )
2762                                 si->si_nopres = 0;
2763                         else
2764                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2765                         break;
2766                 case SP_USEHINT:
2767                         if ( si->si_usehint )
2768                                 si->si_usehint = 0;
2769                         else
2770                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2771                         break;
2772                 }
2773                 return rc;
2774         }
2775         switch ( c->type ) {
2776         case SP_CHKPT:
2777                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2778                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2779                                 c->argv[0], c->argv[1] );
2780                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2781                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2782                         return ARG_BAD_CONF;
2783                 }
2784                 if ( si->si_chkops <= 0 ) {
2785                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2786                                 c->argv[0], si->si_chkops );
2787                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2788                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2789                         return ARG_BAD_CONF;
2790                 }
2791                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2792                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2793                                 c->argv[0], c->argv[1] );
2794                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2795                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2796                         return ARG_BAD_CONF;
2797                 }
2798                 if ( si->si_chktime <= 0 ) {
2799                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2800                                 c->argv[0], si->si_chkops );
2801                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2802                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2803                         return ARG_BAD_CONF;
2804                 }
2805                 si->si_chktime *= 60;
2806                 break;
2807         case SP_SESSL: {
2808                 sessionlog *sl;
2809                 int size = c->value_int;
2810
2811                 if ( size < 0 ) {
2812                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2813                                 c->argv[0], size );
2814                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2815                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2816                         return ARG_BAD_CONF;
2817                 }
2818                 sl = si->si_logs;
2819                 if ( !sl ) {
2820                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2821                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2822                         sl->sl_mincsn.bv_len = 0;
2823                         sl->sl_num = 0;
2824                         sl->sl_head = sl->sl_tail = NULL;
2825                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2826                         si->si_logs = sl;
2827                 }
2828                 sl->sl_size = size;
2829                 }
2830                 break;
2831         case SP_NOPRES:
2832                 si->si_nopres = c->value_int;
2833                 break;
2834         case SP_USEHINT:
2835                 si->si_usehint = c->value_int;
2836                 break;
2837         }
2838         return rc;
2839 }
2840
2841 /* ITS#3456 we cannot run this search on the main thread, must use a
2842  * child thread in order to insure we have a big enough stack.
2843  */
2844 static void *
2845 syncprov_db_otask(
2846         void *ptr
2847 )
2848 {
2849         syncprov_findcsn( ptr, FIND_MAXCSN );
2850         return NULL;
2851 }
2852
2853 /* Read any existing contextCSN from the underlying db.
2854  * Then search for any entries newer than that. If no value exists,
2855  * just generate it. Cache whatever result.
2856  */
2857 static int
2858 syncprov_db_open(
2859         BackendDB *be,
2860         ConfigReply *cr
2861 )
2862 {
2863         slap_overinst   *on = (slap_overinst *) be->bd_info;
2864         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2865
2866         Connection conn = { 0 };
2867         OperationBuffer opbuf;
2868         Operation *op;
2869         Entry *e = NULL;
2870         Attribute *a;
2871         int rc;
2872         void *thrctx = NULL;
2873
2874         if ( !SLAP_LASTMOD( be )) {
2875                 Debug( LDAP_DEBUG_ANY,
2876                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2877                 return -1;
2878         }
2879
2880         if ( slapMode & SLAP_TOOL_MODE ) {
2881                 return 0;
2882         }
2883
2884         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2885         if ( rc ) {
2886                 return rc;
2887         }
2888
2889         thrctx = ldap_pvt_thread_pool_context();
2890         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2891         op = &opbuf.ob_op;
2892         op->o_bd = be;
2893         op->o_dn = be->be_rootdn;
2894         op->o_ndn = be->be_rootndn;
2895
2896         if ( SLAP_SYNC_SUBENTRY( be )) {
2897                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2898                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2899         } else {
2900                 si->si_contextdn = be->be_nsuffix[0];
2901         }
2902         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2903                 slap_schema.si_ad_contextCSN, 0, &e, on );
2904
2905         if ( e ) {
2906                 ldap_pvt_thread_t tid;
2907
2908                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2909                 if ( a ) {
2910                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2911                         si->si_numcsns = a->a_numvals;
2912                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2913                 }
2914                 overlay_entry_release_ov( op, e, 0, on );
2915                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2916                         op->o_req_dn = be->be_suffix[0];
2917                         op->o_req_ndn = be->be_nsuffix[0];
2918                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2919                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2920                         ldap_pvt_thread_join( tid, NULL );
2921                 }
2922         }
2923
2924         /* Didn't find a contextCSN, should we generate one? */
2925         if ( !si->si_ctxcsn ) {
2926                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2927                 struct berval csn;
2928
2929                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2930                 /* If we're also a consumer, then don't generate anything.
2931                  * Wait for our provider to send it to us, or for a local
2932                  * modify if we have multimaster.
2933                  */
2934                         goto out;
2935                 }
2936                 csn.bv_val = csnbuf;
2937                 csn.bv_len = sizeof( csnbuf );
2938                 slap_get_csn( op, &csn, 0 );
2939                 value_add_one( &si->si_ctxcsn, &csn );
2940                 si->si_numcsns = 1;
2941                 si->si_sids = ch_malloc( sizeof(int) );
2942                 si->si_sids[0] = slap_serverID;
2943
2944                 /* make sure we do a checkpoint on close */
2945                 si->si_numops++;
2946         }
2947
2948 out:
2949         op->o_bd->bd_info = (BackendInfo *)on;
2950         return 0;
2951 }
2952
2953 /* Write the current contextCSN into the underlying db.
2954  */
2955 static int
2956 syncprov_db_close(
2957         BackendDB *be,
2958         ConfigReply *cr
2959 )
2960 {
2961     slap_overinst   *on = (slap_overinst *) be->bd_info;
2962     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2963
2964         if ( slapMode & SLAP_TOOL_MODE ) {
2965                 return 0;
2966         }
2967         if ( si->si_numops ) {
2968                 Connection conn = {0};
2969                 OperationBuffer opbuf;
2970                 Operation *op;
2971                 SlapReply rs = {REP_RESULT};
2972                 void *thrctx;
2973
2974                 thrctx = ldap_pvt_thread_pool_context();
2975                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2976                 op = &opbuf.ob_op;
2977                 op->o_bd = be;
2978                 op->o_dn = be->be_rootdn;
2979                 op->o_ndn = be->be_rootndn;
2980                 syncprov_checkpoint( op, &rs, on );
2981         }
2982
2983     return 0;
2984 }
2985
2986 static int
2987 syncprov_db_init(
2988         BackendDB *be,
2989         ConfigReply *cr
2990 )
2991 {
2992         slap_overinst   *on = (slap_overinst *)be->bd_info;
2993         syncprov_info_t *si;
2994
2995         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2996                 Debug( LDAP_DEBUG_ANY,
2997                         "syncprov must be instantiated within a database.\n",
2998                         0, 0, 0 );
2999                 return 1;
3000         }
3001
3002         si = ch_calloc(1, sizeof(syncprov_info_t));
3003         on->on_bi.bi_private = si;
3004         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3005         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3006         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3007         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3008
3009         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3010         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3011         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3012         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3013
3014         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3015         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3016
3017         return 0;
3018 }
3019
3020 static int
3021 syncprov_db_destroy(
3022         BackendDB *be,
3023         ConfigReply *cr
3024 )
3025 {
3026         slap_overinst   *on = (slap_overinst *)be->bd_info;
3027         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3028
3029         if ( si ) {
3030                 if ( si->si_logs ) {
3031                         slog_entry *se = si->si_logs->sl_head;
3032
3033                         while ( se ) {
3034                                 slog_entry *se_next = se->se_next;
3035                                 ch_free( se );
3036                                 se = se_next;
3037                         }
3038
3039                         ch_free( si->si_logs );
3040                 }
3041                 if ( si->si_ctxcsn )
3042                         ber_bvarray_free( si->si_ctxcsn );
3043                 if ( si->si_sids )
3044                         ch_free( si->si_sids );
3045                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3046                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3047                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3048                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3049                 ch_free( si );
3050         }
3051
3052         return 0;
3053 }
3054
3055 static int syncprov_parseCtrl (
3056         Operation *op,
3057         SlapReply *rs,
3058         LDAPControl *ctrl )
3059 {
3060         ber_tag_t tag;
3061         BerElementBuffer berbuf;
3062         BerElement *ber = (BerElement *)&berbuf;
3063         ber_int_t mode;
3064         ber_len_t len;
3065         struct berval cookie = BER_BVNULL;
3066         sync_control *sr;
3067         int rhint = 0;
3068
3069         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3070                 rs->sr_text = "Sync control specified multiple times";
3071                 return LDAP_PROTOCOL_ERROR;
3072         }
3073
3074         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3075                 rs->sr_text = "Sync control specified with pagedResults control";
3076                 return LDAP_PROTOCOL_ERROR;
3077         }
3078
3079         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3080                 rs->sr_text = "Sync control value is absent";
3081                 return LDAP_PROTOCOL_ERROR;
3082         }
3083
3084         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3085                 rs->sr_text = "Sync control value is empty";
3086                 return LDAP_PROTOCOL_ERROR;
3087         }
3088
3089         /* Parse the control value
3090          *      syncRequestValue ::= SEQUENCE {
3091          *              mode   ENUMERATED {
3092          *                      -- 0 unused
3093          *                      refreshOnly             (1),
3094          *                      -- 2 reserved
3095          *                      refreshAndPersist       (3)
3096          *              },
3097          *              cookie  syncCookie OPTIONAL
3098          *      }
3099          */
3100
3101         ber_init2( ber, &ctrl->ldctl_value, 0 );
3102
3103         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3104                 rs->sr_text = "Sync control : mode decoding error";
3105                 return LDAP_PROTOCOL_ERROR;
3106         }
3107
3108         switch( mode ) {
3109         case LDAP_SYNC_REFRESH_ONLY:
3110                 mode = SLAP_SYNC_REFRESH;
3111                 break;
3112         case LDAP_SYNC_REFRESH_AND_PERSIST:
3113                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3114                 break;
3115         default:
3116                 rs->sr_text = "Sync control : unknown update mode";
3117                 return LDAP_PROTOCOL_ERROR;
3118         }
3119
3120         tag = ber_peek_tag( ber, &len );
3121
3122         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3123                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3124                         rs->sr_text = "Sync control : cookie decoding error";
3125                         return LDAP_PROTOCOL_ERROR;
3126                 }
3127                 tag = ber_peek_tag( ber, &len );
3128         }
3129         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3130                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3131                         rs->sr_text = "Sync control : rhint decoding error";
3132                         return LDAP_PROTOCOL_ERROR;
3133                 }
3134         }
3135         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3136                         rs->sr_text = "Sync control : decoding error";
3137                         return LDAP_PROTOCOL_ERROR;
3138         }
3139         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3140         sr->sr_rhint = rhint;
3141         if (!BER_BVISNULL(&cookie)) {
3142                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3143                 /* If parse fails, pretend no cookie was sent */
3144                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3145                         sr->sr_state.rid == -1 ) {
3146                         if ( sr->sr_state.ctxcsn ) {
3147                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3148                                 sr->sr_state.ctxcsn = NULL;
3149                         }
3150                         sr->sr_state.numcsns = 0;
3151                 }
3152         }
3153
3154         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3155
3156         op->o_sync = ctrl->ldctl_iscritical
3157                 ? SLAP_CONTROL_CRITICAL
3158                 : SLAP_CONTROL_NONCRITICAL;
3159
3160         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3161
3162         return LDAP_SUCCESS;
3163 }
3164
3165 /* This overlay is set up for dynamic loading via moduleload. For static
3166  * configuration, you'll need to arrange for the slap_overinst to be
3167  * initialized and registered by some other function inside slapd.
3168  */
3169
3170 static slap_overinst            syncprov;
3171
3172 int
3173 syncprov_initialize()
3174 {
3175         int rc;
3176
3177         rc = register_supported_control( LDAP_CONTROL_SYNC,
3178                 SLAP_CTRL_SEARCH, NULL,
3179                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3180         if ( rc != LDAP_SUCCESS ) {
3181                 Debug( LDAP_DEBUG_ANY,
3182                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3183                 return rc;
3184         }
3185
3186         syncprov.on_bi.bi_type = "syncprov";
3187         syncprov.on_bi.bi_db_init = syncprov_db_init;
3188         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3189         syncprov.on_bi.bi_db_open = syncprov_db_open;
3190         syncprov.on_bi.bi_db_close = syncprov_db_close;
3191
3192         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3193         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3194
3195         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3196         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3197         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3198         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3199         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3200         syncprov.on_bi.bi_op_search = syncprov_op_search;
3201         syncprov.on_bi.bi_extended = syncprov_op_extended;
3202         syncprov.on_bi.bi_operational = syncprov_operational;
3203
3204         syncprov.on_bi.bi_cf_ocs = spocs;
3205
3206         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3207
3208         rc = config_register_schema( spcfg, spocs );
3209         if ( rc ) return rc;
3210
3211         return overlay_register( &syncprov );
3212 }
3213
3214 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3215 int
3216 init_module( int argc, char *argv[] )
3217 {
3218         return syncprov_initialize();
3219 }
3220 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3221
3222 #endif /* defined(SLAPD_OVER_SYNCPROV) */