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         int             *si_sids;
 128         int             si_numcsns;
 129         int             si_chkops;      /* checkpointing info */
 130         int             si_chktime;
 131         int             si_numops;      /* number of ops since last checkpoint */
 132         int             si_nopres;      /* Skip present phase */
 133         int             si_usehint;     /* use reload hint */
 134         time_t  si_chklast;     /* time of last checkpoint */
 135         Avlnode *si_mods;       /* entries being modified */
 136         sessionlog      *si_logs;
 137         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 138         ldap_pvt_thread_mutex_t si_ops_mutex;
 139         ldap_pvt_thread_mutex_t si_mods_mutex;
 140 } syncprov_info_t;
 141
 142 typedef struct opcookie {
 143         slap_overinst *son;
 144         syncmatches *smatches;
 145         struct berval sdn;      /* DN of entry, for deletes */
 146         struct berval sndn;
 147         struct berval suuid;    /* UUID of entry */
 148         struct berval sctxcsn;
 149         int sreference; /* Is the entry a reference? */
 150 } opcookie;
 151
 152 typedef struct fbase_cookie {
 153         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 154         syncops *fss;   /* persistent search we're testing against */
 155         int fbase;      /* if TRUE we found the search base and it's still valid */
 156         int fscope;     /* if TRUE then fdn is within the psearch scope */
 157 } fbase_cookie;
 158
 159 static AttributeName csn_anlist[3];
 160 static AttributeName uuid_anlist[2];
 161
 162 /* Build a LDAPsync intermediate state control */
 163 static int
 164 syncprov_state_ctrl(
 165         Operation       *op,
 166         SlapReply       *rs,
 167         Entry           *e,
 168         int             entry_sync_state,
 169         LDAPControl     **ctrls,
 170         int             num_ctrls,
 171         int             send_cookie,
 172         struct berval   *cookie )
 173 {
 174         Attribute* a;
 175         int ret;
 176
 177         BerElementBuffer berbuf;
 178         BerElement *ber = (BerElement *)&berbuf;
 179
 180         struct berval   entryuuid_bv = BER_BVNULL;
 181
 182         ber_init2( ber, 0, LBER_USE_DER );
 183         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 184
 185         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 186
 187         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 188                 AttributeDescription *desc = a->a_desc;
 189                 if ( desc == slap_schema.si_ad_entryUUID ) {
 190                         entryuuid_bv = a->a_nvals[0];
 191                         break;
 192                 }
 193         }
 194
 195         /* FIXME: what if entryuuid is NULL or empty ? */
 196
 197         if ( send_cookie && cookie ) {
 198                 ber_printf( ber, "{eOON}",
 199                         entry_sync_state, &entryuuid_bv, cookie );
 200         } else {
 201                 ber_printf( ber, "{eON}",
 202                         entry_sync_state, &entryuuid_bv );
 203         }
 204
 205         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 206         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 207         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 208
 209         ber_free_buf( ber );
 210
 211         if ( ret < 0 ) {
 212                 Debug( LDAP_DEBUG_TRACE,
 213                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 214                         0, 0, 0 );
 215                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 216                 return ret;
 217         }
 218
 219         return LDAP_SUCCESS;
 220 }
 221
 222 /* Build a LDAPsync final state control */
 223 static int
 224 syncprov_done_ctrl(
 225         Operation       *op,
 226         SlapReply       *rs,
 227         LDAPControl     **ctrls,
 228         int                     num_ctrls,
 229         int                     send_cookie,
 230         struct berval *cookie,
 231         int                     refreshDeletes )
 232 {
 233         int ret;
 234         BerElementBuffer berbuf;
 235         BerElement *ber = (BerElement *)&berbuf;
 236
 237         ber_init2( ber, NULL, LBER_USE_DER );
 238         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 239
 240         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 241
 242         ber_printf( ber, "{" );
 243         if ( send_cookie && cookie ) {
 244                 ber_printf( ber, "O", cookie );
 245         }
 246         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 247                 ber_printf( ber, "b", refreshDeletes );
 248         }
 249         ber_printf( ber, "N}" );
 250
 251         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 252         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 253         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 254
 255         ber_free_buf( ber );
 256
 257         if ( ret < 0 ) {
 258                 Debug( LDAP_DEBUG_TRACE,
 259                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 260                         0, 0, 0 );
 261                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 262                 return ret;
 263         }
 264
 265         return LDAP_SUCCESS;
 266 }
 267
 268 static int
 269 syncprov_sendinfo(
 270         Operation       *op,
 271         SlapReply       *rs,
 272         int                     type,
 273         struct berval *cookie,
 274         int                     refreshDone,
 275         BerVarray       syncUUIDs,
 276         int                     refreshDeletes )
 277 {
 278         BerElementBuffer berbuf;
 279         BerElement *ber = (BerElement *)&berbuf;
 280         struct berval rspdata;
 281
 282         int ret;
 283
 284         ber_init2( ber, NULL, LBER_USE_DER );
 285         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 286
 287         if ( type ) {
 288                 switch ( type ) {
 289                 case LDAP_TAG_SYNC_NEW_COOKIE:
 290                         ber_printf( ber, "tO", type, cookie );
 291                         break;
 292                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 293                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 294                         ber_printf( ber, "t{", type );
 295                         if ( cookie ) {
 296                                 ber_printf( ber, "O", cookie );
 297                         }
 298                         if ( refreshDone == 0 ) {
 299                                 ber_printf( ber, "b", refreshDone );
 300                         }
 301                         ber_printf( ber, "N}" );
 302                         break;
 303                 case LDAP_TAG_SYNC_ID_SET:
 304                         ber_printf( ber, "t{", type );
 305                         if ( cookie ) {
 306                                 ber_printf( ber, "O", cookie );
 307                         }
 308                         if ( refreshDeletes == 1 ) {
 309                                 ber_printf( ber, "b", refreshDeletes );
 310                         }
 311                         ber_printf( ber, "[W]", syncUUIDs );
 312                         ber_printf( ber, "N}" );
 313                         break;
 314                 default:
 315                         Debug( LDAP_DEBUG_TRACE,
 316                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 317                                 type, 0, 0 );
 318                         return LDAP_OTHER;
 319                 }
 320         }
 321
 322         ret = ber_flatten2( ber, &rspdata, 0 );
 323
 324         if ( ret < 0 ) {
 325                 Debug( LDAP_DEBUG_TRACE,
 326                         "syncprov_sendinfo: ber_flatten2 failed\n",
 327                         0, 0, 0 );
 328                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 329                 return ret;
 330         }
 331
 332         rs->sr_rspoid = LDAP_SYNC_INFO;
 333         rs->sr_rspdata = &rspdata;
 334         send_ldap_intermediate( op, rs );
 335         rs->sr_rspdata = NULL;
 336         ber_free_buf( ber );
 337
 338         return LDAP_SUCCESS;
 339 }
 340
 341 /* Find a modtarget in an AVL tree */
 342 static int
 343 sp_avl_cmp( const void *c1, const void *c2 )
 344 {
 345         const modtarget *m1, *m2;
 346         int rc;
 347
 348         m1 = c1; m2 = c2;
 349         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 350
 351         if ( rc ) return rc;
 352         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 353 }
 354
 355 /* syncprov_findbase:
 356  *   finds the true DN of the base of a search (with alias dereferencing) and
 357  * checks to make sure the base entry doesn't get replaced with a different
 358  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 359  * change is detected, any persistent search on this base must be terminated /
 360  * reloaded.
 361  *   On the first call, we just save the DN and entryID. On subsequent calls
 362  * we compare the DN and entryID with the saved values.
 363  */
 364 static int
 365 findbase_cb( Operation *op, SlapReply *rs )
 366 {
 367         slap_callback *sc = op->o_callback;
 368
 369         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 370                 fbase_cookie *fc = sc->sc_private;
 371
 372                 /* If no entryID, we're looking for the first time.
 373                  * Just store whatever we got.
 374                  */
 375                 if ( fc->fss->s_eid == NOID ) {
 376                         fc->fbase = 2;
 377                         fc->fss->s_eid = rs->sr_entry->e_id;
 378                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 379
 380                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 381                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 382
 383                 /* OK, the DN is the same and the entryID is the same. */
 384                         fc->fbase = 1;
 385                 }
 386         }
 387         if ( rs->sr_err != LDAP_SUCCESS ) {
 388                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 389         }
 390         return LDAP_SUCCESS;
 391 }
 392
 393 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 394 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 395
 396 static int
 397 syncprov_findbase( Operation *op, fbase_cookie *fc )
 398 {
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 int rc;
 408
 409                 fc->fss->s_flags ^= PS_FIND_BASE;
 410                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 411
 412                 fop = *fc->fss->s_op;
 413
 414                 fop.o_bd = fop.o_bd->bd_self;
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_time = op->o_time;
 417                 fop.o_tincr = op->o_tincr;
 418
 419                 cb.sc_response = findbase_cb;
 420                 cb.sc_private = fc;
 421
 422                 fop.o_sync_mode = 0;    /* turn off sync mode */
 423                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 424                 fop.o_callback = &cb;
 425                 fop.o_tag = LDAP_REQ_SEARCH;
 426                 fop.ors_scope = LDAP_SCOPE_BASE;
 427                 fop.ors_limit = NULL;
 428                 fop.ors_slimit = 1;
 429                 fop.ors_tlimit = SLAP_NO_LIMIT;
 430                 fop.ors_attrs = slap_anlist_no_attrs;
 431                 fop.ors_attrsonly = 1;
 432                 fop.ors_filter = &generic_filter;
 433                 fop.ors_filterstr = generic_filterstr;
 434
 435                 rc = fop.o_bd->be_search( &fop, &frs );
 436         } else {
 437                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 438                 fc->fbase = 1;
 439         }
 440
 441         /* After the first call, see if the fdn resides in the scope */
 442         if ( fc->fbase == 1 ) {
 443                 switch ( fc->fss->s_op->ors_scope ) {
 444                 case LDAP_SCOPE_BASE:
 445                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 446                         break;
 447                 case LDAP_SCOPE_ONELEVEL: {
 448                         struct berval pdn;
 449                         dnParent( fc->fdn, &pdn );
 450                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 451                         break; }
 452                 case LDAP_SCOPE_SUBTREE:
 453                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 454                         break;
 455                 case LDAP_SCOPE_SUBORDINATE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 457                                 !dn_match( fc->fdn, &fc->fss->s_base );
 458                         break;
 459                 }
 460         }
 461
 462         if ( fc->fbase )
 463                 return LDAP_SUCCESS;
 464
 465         /* If entryID has changed, then the base of this search has
 466          * changed. Invalidate the psearch.
 467          */
 468         return LDAP_NO_SUCH_OBJECT;
 469 }
 470
 471 /* syncprov_findcsn:
 472  *   This function has three different purposes, but they all use a search
 473  * that filters on entryCSN so they're combined here.
 474  * 1: at startup time, after a contextCSN has been read from the database,
 475  * we search for all entries with CSN >= contextCSN in case the contextCSN
 476  * was not checkpointed at the previous shutdown.
 477  *
 478  * 2: when the current contextCSN is known and we have a sync cookie, we search
 479  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 480  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 481  *
 482  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 483  * CSN, and generate Present records for them. We always collect this result
 484  * in SyncID sets, even if there's only one match.
 485  */
 486 typedef enum find_csn_t {
 487         FIND_MAXCSN     = 1,
 488         FIND_CSN        = 2,
 489         FIND_PRESENT    = 3
 490 } find_csn_t;
 491
 492 static int
 493 findmax_cb( Operation *op, SlapReply *rs )
 494 {
 495         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 496                 struct berval *maxcsn = op->o_callback->sc_private;
 497                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 498                         slap_schema.si_ad_entryCSN );
 499
 500                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 501                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 502                         maxcsn->bv_len = a->a_vals[0].bv_len;
 503                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 504                 }
 505         }
 506         return LDAP_SUCCESS;
 507 }
 508
 509 static int
 510 findcsn_cb( Operation *op, SlapReply *rs )
 511 {
 512         slap_callback *sc = op->o_callback;
 513
 514         /* We just want to know that at least one exists, so it's OK if
 515          * we exceed the unchecked limit.
 516          */
 517         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 518                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 519                 sc->sc_private = (void *)1;
 520         }
 521         return LDAP_SUCCESS;
 522 }
 523
 524 /* Build a list of entryUUIDs for sending in a SyncID set */
 525
 526 #define UUID_LEN        16
 527
 528 typedef struct fpres_cookie {
 529         int num;
 530         BerVarray uuids;
 531         char *last;
 532 } fpres_cookie;
 533
 534 static int
 535 findpres_cb( Operation *op, SlapReply *rs )
 536 {
 537         slap_callback *sc = op->o_callback;
 538         fpres_cookie *pc = sc->sc_private;
 539         Attribute *a;
 540         int ret = SLAP_CB_CONTINUE;
 541
 542         switch ( rs->sr_type ) {
 543         case REP_SEARCH:
 544                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 545                 if ( a ) {
 546                         pc->uuids[pc->num].bv_val = pc->last;
 547                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 548                                 pc->uuids[pc->num].bv_len );
 549                         pc->num++;
 550                         pc->last = pc->uuids[pc->num].bv_val;
 551                         pc->uuids[pc->num].bv_val = NULL;
 552                 }
 553                 ret = LDAP_SUCCESS;
 554                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 555                         break;
 556                 /* FALLTHRU */
 557         case REP_RESULT:
 558                 ret = rs->sr_err;
 559                 if ( pc->num ) {
 560                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 561                                 0, pc->uuids, 0 );
 562                         pc->uuids[pc->num].bv_val = pc->last;
 563                         pc->num = 0;
 564                         pc->last = pc->uuids[0].bv_val;
 565                 }
 566                 break;
 567         default:
 568                 break;
 569         }
 570         return ret;
 571 }
 572
 573 static int
 574 syncprov_findcsn( Operation *op, find_csn_t mode )
 575 {
 576         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 577         syncprov_info_t         *si = on->on_bi.bi_private;
 578
 579         slap_callback cb = {0};
 580         Operation fop;
 581         SlapReply frs = { REP_RESULT };
 582         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 583         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 584         struct berval maxcsn;
 585         Filter cf;
 586         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 587         fpres_cookie pcookie;
 588         sync_control *srs = NULL;
 589         struct slap_limits_set fc_limits;
 590         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 591         int maxid;
 592
 593         if ( mode != FIND_MAXCSN ) {
 594                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 595         }
 596
 597         fop = *op;
 598         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 599         /* We want pure entries, not referrals */
 600         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 601
 602         cf.f_ava = &eq;
 603         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 604         BER_BVZERO( &cf.f_av_value );
 605         cf.f_next = NULL;
 606
 607         fop.o_callback = &cb;
 608         fop.ors_limit = NULL;
 609         fop.ors_tlimit = SLAP_NO_LIMIT;
 610         fop.ors_filter = &cf;
 611         fop.ors_filterstr.bv_val = buf;
 612
 613 again:
 614         switch( mode ) {
 615         case FIND_MAXCSN:
 616                 cf.f_choice = LDAP_FILTER_GE;
 617                 /* If there are multiple CSNs, use the one with our serverID */
 618                 for ( i=0; i<si->si_numcsns; i++) {
 619                         if ( slap_serverID == si->si_sids[i] ) {
 620                                 maxid = i;
 621                                 break;
 622                         }
 623                 }
 624                 if ( i == si->si_numcsns ) {
 625                         /* No match: this is multimaster, and none of the content in the DB
 626                          * originated locally. Treat like no CSN.
 627                          */
 628                         return LDAP_NO_SUCH_OBJECT;
 629                 }
 630                 cf.f_av_value = si->si_ctxcsn[maxid];
 631                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 632                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 633                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 634                         return LDAP_OTHER;
 635                 }
 636                 fop.ors_attrsonly = 0;
 637                 fop.ors_attrs = csn_anlist;
 638                 fop.ors_slimit = SLAP_NO_LIMIT;
 639                 cb.sc_private = &maxcsn;
 640                 cb.sc_response = findmax_cb;
 641                 strcpy( cbuf, cf.f_av_value.bv_val );
 642                 maxcsn.bv_val = cbuf;
 643                 maxcsn.bv_len = cf.f_av_value.bv_len;
 644                 break;
 645         case FIND_CSN:
 646                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 647                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 648                         /* If there are multiple CSNs, use the smallest */
 649                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 650                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 651                                         > 0 ) {
 652                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 653                                 }
 654                         }
 655                 }
 656                 /* Look for exact match the first time */
 657                 if ( findcsn_retry ) {
 658                         cf.f_choice = LDAP_FILTER_EQUALITY;
 659                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 660                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 661                 /* On retry, look for <= */
 662                 } else {
 663                         cf.f_choice = LDAP_FILTER_LE;
 664                         fop.ors_limit = &fc_limits;
 665                         memset( &fc_limits, 0, sizeof( fc_limits ));
 666                         fc_limits.lms_s_unchecked = 1;
 667                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 668                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 669                 }
 670                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 671                         return LDAP_OTHER;
 672                 }
 673                 fop.ors_attrsonly = 1;
 674                 fop.ors_attrs = slap_anlist_no_attrs;
 675                 fop.ors_slimit = 1;
 676                 cb.sc_private = NULL;
 677                 cb.sc_response = findcsn_cb;
 678                 break;
 679         case FIND_PRESENT:
 680                 fop.ors_filter = op->ors_filter;
 681                 fop.ors_filterstr = op->ors_filterstr;
 682                 fop.ors_attrsonly = 0;
 683                 fop.ors_attrs = uuid_anlist;
 684                 fop.ors_slimit = SLAP_NO_LIMIT;
 685                 cb.sc_private = &pcookie;
 686                 cb.sc_response = findpres_cb;
 687                 pcookie.num = 0;
 688
 689                 /* preallocate storage for a full set */
 690                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 691                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 692                         op->o_tmpmemctx );
 693                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 694                 pcookie.uuids[0].bv_val = pcookie.last;
 695                 pcookie.uuids[0].bv_len = UUID_LEN;
 696                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 697                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 698                         pcookie.uuids[i].bv_len = UUID_LEN;
 699                 }
 700                 break;
 701         }
 702
 703         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 704         fop.o_bd->be_search( &fop, &frs );
 705         fop.o_bd->bd_info = (BackendInfo *)on;
 706
 707         switch( mode ) {
 708         case FIND_MAXCSN:
 709                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 710 #ifdef CHECK_CSN
 711                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 712                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 713 #endif
 714                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 715                         si->si_numops++;        /* ensure a checkpoint */
 716                 }
 717                 break;
 718         case FIND_CSN:
 719                 /* If matching CSN was not found, invalidate the context. */
 720                 if ( !cb.sc_private ) {
 721                         /* If we didn't find an exact match, then try for <= */
 722                         if ( findcsn_retry ) {
 723                                 findcsn_retry = 0;
 724                                 goto again;
 725                         }
 726                         rc = LDAP_NO_SUCH_OBJECT;
 727                 }
 728                 break;
 729         case FIND_PRESENT:
 730                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 731                 break;
 732         }
 733
 734         return rc;
 735 }
 736
 737 static void
 738 syncprov_free_syncop( syncops *so )
 739 {
 740         syncres *sr, *srnext;
 741         GroupAssertion *ga, *gnext;
 742
 743         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 744         if ( --so->s_inuse > 0 ) {
 745                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 746                 return;
 747         }
 748         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 749         if ( so->s_flags & PS_IS_DETACHED ) {
 750                 filter_free( so->s_op->ors_filter );
 751                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 752                         gnext = ga->ga_next;
 753                         ch_free( ga );
 754                 }
 755                 ch_free( so->s_op );
 756         }
 757         ch_free( so->s_base.bv_val );
 758         for ( sr=so->s_res; sr; sr=srnext ) {
 759                 srnext = sr->s_next;
 760                 ch_free( sr );
 761         }
 762         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 763         ch_free( so );
 764 }
 765
 766 /* Send a persistent search response */
 767 static int
 768 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 769         Entry **e, int mode )
 770 {
 771         slap_overinst *on = opc->son;
 772
 773         SlapReply rs = { REP_SEARCH };
 774         LDAPControl *ctrls[2];
 775         struct berval cookie, csns[2];
 776         Entry e_uuid = {0};
 777         Attribute a_uuid = {0};
 778
 779         if ( so->s_op->o_abandon )
 780                 return SLAPD_ABANDON;
 781
 782         ctrls[1] = NULL;
 783         csns[0] = opc->sctxcsn;
 784         BER_BVZERO( &csns[1] );
 785         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 786
 787         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 788
 789         e_uuid.e_attrs = &a_uuid;
 790         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 791         a_uuid.a_nvals = &opc->suuid;
 792         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 793                 mode, ctrls, 0, 1, &cookie );
 794         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 795
 796         rs.sr_ctrls = ctrls;
 797         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 798         switch( mode ) {
 799         case LDAP_SYNC_ADD:
 800                 rs.sr_entry = *e;
 801                 if ( rs.sr_entry->e_private )
 802                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 803                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 804                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 805                         rs.sr_err = send_search_reference( op, &rs );
 806                         ber_bvarray_free( rs.sr_ref );
 807                         if ( !rs.sr_entry )
 808                                 *e = NULL;
 809                         break;
 810                 }
 811                 /* fallthru */
 812         case LDAP_SYNC_MODIFY:
 813                 rs.sr_entry = *e;
 814                 if ( rs.sr_entry->e_private )
 815                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 816                 rs.sr_attrs = op->ors_attrs;
 817                 rs.sr_err = send_search_entry( op, &rs );
 818                 if ( !rs.sr_entry )
 819                         *e = NULL;
 820                 break;
 821         case LDAP_SYNC_DELETE:
 822                 e_uuid.e_attrs = NULL;
 823                 e_uuid.e_name = opc->sdn;
 824                 e_uuid.e_nname = opc->sndn;
 825                 rs.sr_entry = &e_uuid;
 826                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 827                         struct berval bv = BER_BVNULL;
 828                         rs.sr_ref = &bv;
 829                         rs.sr_err = send_search_reference( op, &rs );
 830                 } else {
 831                         rs.sr_err = send_search_entry( op, &rs );
 832                 }
 833                 break;
 834         default:
 835                 assert(0);
 836         }
 837         /* In case someone else freed it already? */
 838         if ( rs.sr_ctrls ) {
 839                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 840                 rs.sr_ctrls = NULL;
 841         }
 842
 843         return rs.sr_err;
 844 }
 845
 846 static void
 847 syncprov_qstart( syncops *so );
 848
 849 /* Play back queued responses */
 850 static int
 851 syncprov_qplay( Operation *op, syncops *so )
 852 {
 853         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 854         syncres *sr;
 855         Entry *e;
 856         opcookie opc;
 857         int rc = 0;
 858
 859         opc.son = on;
 860
 861         do {
 862                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 863                 sr = so->s_res;
 864                 if ( sr )
 865                         so->s_res = sr->s_next;
 866                 if ( !so->s_res )
 867                         so->s_restail = NULL;
 868                 /* Exit loop with mutex held */
 869                 if ( !sr || so->s_op->o_abandon )
 870                         break;
 871                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 872
 873                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 874                     SlapReply rs = { REP_INTERMEDIATE };
 875
 876                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 877                                 &sr->s_csn, 0, NULL, 0 );
 878                 } else {
 879                         opc.sdn = sr->s_dn;
 880                         opc.sndn = sr->s_ndn;
 881                         opc.suuid = sr->s_uuid;
 882                         opc.sctxcsn = sr->s_csn;
 883                         opc.sreference = sr->s_isreference;
 884                         e = NULL;
 885
 886                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 887                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 888                                 if ( rc ) {
 889                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 890                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 891                                         ch_free( sr );
 892                                         rc = 0;
 893                                         continue;
 894                                 }
 895                         }
 896                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 897
 898                         if ( e ) {
 899                                 overlay_entry_release_ov( op, e, 0, on );
 900                         }
 901                 }
 902
 903                 ch_free( sr );
 904
 905                 /* Exit loop with mutex held */
 906                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 907
 908         } while (0);
 909
 910         /* We now only send one change at a time, to prevent one
 911          * psearch from hogging all the CPU. Resubmit this task if
 912          * there are more responses queued and no errors occurred.
 913          */
 914
 915         if ( rc == 0 && so->s_res ) {
 916                 syncprov_qstart( so );
 917         } else {
 918                 so->s_flags ^= PS_TASK_QUEUED;
 919         }
 920
 921         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 922         return rc;
 923 }
 924
 925 /* task for playing back queued responses */
 926 static void *
 927 syncprov_qtask( void *ctx, void *arg )
 928 {
 929         syncops *so = arg;
 930         OperationBuffer opbuf;
 931         Operation *op;
 932         BackendDB be;
 933         int rc;
 934
 935         op = &opbuf.ob_op;
 936         *op = *so->s_op;
 937         op->o_hdr = &opbuf.ob_hdr;
 938         op->o_controls = opbuf.ob_controls;
 939         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 940
 941         *op->o_hdr = *so->s_op->o_hdr;
 942
 943         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 944         op->o_tmpmfuncs = &slap_sl_mfuncs;
 945         op->o_threadctx = ctx;
 946
 947         /* syncprov_qplay expects a fake db */
 948         be = *so->s_op->o_bd;
 949         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 950         op->o_bd = &be;
 951         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 952         op->o_callback = NULL;
 953
 954         rc = syncprov_qplay( op, so );
 955
 956         /* decrement use count... */
 957         syncprov_free_syncop( so );
 958
 959         return NULL;
 960 }
 961
 962 /* Start the task to play back queued psearch responses */
 963 static void
 964 syncprov_qstart( syncops *so )
 965 {
 966         so->s_flags |= PS_TASK_QUEUED;
 967         so->s_inuse++;
 968         ldap_pvt_thread_pool_submit( &connection_pool,
 969                 syncprov_qtask, so );
 970 }
 971
 972 /* Queue a persistent search response */
 973 static int
 974 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 975 {
 976         syncres *sr;
 977         int srsize;
 978         struct berval cookie = opc->sctxcsn;
 979
 980         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
 981                 syncprov_info_t *si = opc->son->on_bi.bi_private;
 982
 983                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
 984                         so->s_rid, so->s_sid);
 985         } else if ( opc->sctxcsn.bv_len ) {
 986                 /* Don't send changes back to their originator */
 987                 int sid = slap_parse_csn_sid( &opc->sctxcsn );
 988                 if ( sid >= 0 && sid == so->s_sid )
 989                         return LDAP_SUCCESS;
 990         }
 991
 992         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
 993                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
 994         if ( cookie.bv_len )
 995                 srsize += cookie.bv_len + 1;
 996         sr = ch_malloc( srsize );
 997         sr->s_next = NULL;
 998         sr->s_dn.bv_val = (char *)(sr + 1);
 999         sr->s_dn.bv_len = opc->sdn.bv_len;
1000         sr->s_mode = mode;
1001         sr->s_isreference = opc->sreference;
1002         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1003                  opc->sdn.bv_val ) + 1;
1004         sr->s_ndn.bv_len = opc->sndn.bv_len;
1005         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1006                  opc->sndn.bv_val ) + 1;
1007         sr->s_uuid.bv_len = opc->suuid.bv_len;
1008         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1009         if ( cookie.bv_len ) {
1010                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1011                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1012         } else {
1013                 sr->s_csn.bv_val = NULL;
1014         }
1015         sr->s_csn.bv_len = cookie.bv_len;
1016
1017         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1018                 ch_free( cookie.bv_val );
1019         }
1020
1021         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1022         if ( !so->s_res ) {
1023                 so->s_res = sr;
1024         } else {
1025                 so->s_restail->s_next = sr;
1026         }
1027         so->s_restail = sr;
1028
1029         /* If the base of the psearch was modified, check it next time round */
1030         if ( so->s_flags & PS_WROTE_BASE ) {
1031                 so->s_flags ^= PS_WROTE_BASE;
1032                 so->s_flags |= PS_FIND_BASE;
1033         }
1034         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1035                 syncprov_qstart( so );
1036         }
1037         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1038         return LDAP_SUCCESS;
1039 }
1040
1041 static int
1042 syncprov_drop_psearch( syncops *so, int lock )
1043 {
1044         if ( so->s_flags & PS_IS_DETACHED ) {
1045                 if ( lock )
1046                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1047                 so->s_op->o_conn->c_n_ops_executing--;
1048                 so->s_op->o_conn->c_n_ops_completed++;
1049                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1050                         o_next );
1051                 if ( lock )
1052                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1053         }
1054         syncprov_free_syncop( so );
1055
1056         return 0;
1057 }
1058
1059 static int
1060 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1061 {
1062         slap_callback *sc = op->o_callback;
1063         op->o_callback = sc->sc_next;
1064         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1065         op->o_tmpfree( sc, op->o_tmpmemctx );
1066         return 0;
1067 }
1068
1069 static int
1070 syncprov_op_abandon( Operation *op, SlapReply *rs )
1071 {
1072         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1073         syncprov_info_t         *si = on->on_bi.bi_private;
1074         syncops *so, *soprev;
1075
1076         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1077         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1078                 soprev=so, so=so->s_next ) {
1079                 if ( so->s_op->o_connid == op->o_connid &&
1080                         so->s_op->o_msgid == op->orn_msgid ) {
1081                                 so->s_op->o_abandon = 1;
1082                                 soprev->s_next = so->s_next;
1083                                 break;
1084                 }
1085         }
1086         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1087         if ( so ) {
1088                 /* Is this really a Cancel exop? */
1089                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1090                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1091                         rs->sr_err = LDAP_CANCELLED;
1092                         send_ldap_result( so->s_op, rs );
1093                         if ( so->s_flags & PS_IS_DETACHED ) {
1094                                 slap_callback *cb;
1095                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1096                                 cb->sc_cleanup = syncprov_ab_cleanup;
1097                                 cb->sc_next = op->o_callback;
1098                                 cb->sc_private = so;
1099                                 return SLAP_CB_CONTINUE;
1100                         }
1101                 }
1102                 syncprov_drop_psearch( so, 0 );
1103         }
1104         return SLAP_CB_CONTINUE;
1105 }
1106
1107 /* Find which persistent searches are affected by this operation */
1108 static void
1109 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1110 {
1111         slap_overinst *on = opc->son;
1112         syncprov_info_t         *si = on->on_bi.bi_private;
1113
1114         fbase_cookie fc;
1115         syncops *ss, *sprev, *snext;
1116         Entry *e = NULL;
1117         Attribute *a;
1118         int rc;
1119         struct berval newdn;
1120         int freefdn = 0;
1121         BackendDB *b0 = op->o_bd, db;
1122
1123         fc.fdn = &op->o_req_ndn;
1124         /* compute new DN */
1125         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1126                 struct berval pdn;
1127                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1128                 else dnParent( fc.fdn, &pdn );
1129                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1130                 fc.fdn = &newdn;
1131                 freefdn = 1;
1132         }
1133         if ( op->o_tag != LDAP_REQ_ADD ) {
1134                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1135                         db = *op->o_bd;
1136                         op->o_bd = &db;
1137                 }
1138                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1139                 /* If we're sending responses now, make a copy and unlock the DB */
1140                 if ( e && !saveit ) {
1141                         Entry *e2 = entry_dup( e );
1142                         overlay_entry_release_ov( op, e, 0, on );
1143                         e = e2;
1144                 }
1145                 if ( rc ) {
1146                         op->o_bd = b0;
1147                         return;
1148                 }
1149         } else {
1150                 e = op->ora_e;
1151         }
1152
1153         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1154                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1155                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1156                 opc->sreference = is_entry_referral( e );
1157                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1158                 if ( a )
1159                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1160         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1161                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1162                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1163                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1164                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1165         }
1166
1167         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1168         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1169                 sprev = ss, ss=snext)
1170         {
1171                 Operation op2;
1172                 Opheader oh;
1173                 syncmatches *sm;
1174                 int found = 0;
1175
1176                 snext = ss->s_next;
1177                 if ( ss->s_op->o_abandon )
1178                         continue;
1179
1180                 /* validate base */
1181                 fc.fss = ss;
1182                 fc.fbase = 0;
1183                 fc.fscope = 0;
1184
1185                 /* If the base of the search is missing, signal a refresh */
1186                 rc = syncprov_findbase( op, &fc );
1187                 if ( rc != LDAP_SUCCESS ) {
1188                         SlapReply rs = {REP_RESULT};
1189                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1190                                 "search base has changed" );
1191                         sprev->s_next = snext;
1192                         syncprov_drop_psearch( ss, 1 );
1193                         ss = sprev;
1194                         continue;
1195                 }
1196
1197
1198                 /* If we're sending results now, look for this op in old matches */
1199                 if ( !saveit ) {
1200                         syncmatches *old;
1201
1202                         /* Did we modify the search base? */
1203                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1204                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1205                                 ss->s_flags |= PS_WROTE_BASE;
1206                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1207                         }
1208
1209                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1210                                 old=sm, sm=sm->sm_next ) {
1211                                 if ( sm->sm_op == ss ) {
1212                                         found = 1;
1213                                         old->sm_next = sm->sm_next;
1214                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1215                                         break;
1216                                 }
1217                         }
1218                 }
1219
1220                 if ( fc.fscope ) {
1221                         op2 = *ss->s_op;
1222                         oh = *op->o_hdr;
1223                         oh.oh_conn = ss->s_op->o_conn;
1224                         oh.oh_connid = ss->s_op->o_connid;
1225                         op2.o_hdr = &oh;
1226                         op2.o_extra = op->o_extra;
1227                 }
1228
1229                 /* check if current o_req_dn is in scope and matches filter */
1230                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1231                         LDAP_COMPARE_TRUE ) {
1232                         if ( saveit ) {
1233                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1234                                 sm->sm_next = opc->smatches;
1235                                 sm->sm_op = ss;
1236                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1237                                 ++ss->s_inuse;
1238                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1239                                 opc->smatches = sm;
1240                         } else {
1241                                 /* if found send UPDATE else send ADD */
1242                                 syncprov_qresp( opc, ss,
1243                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1244                         }
1245                 } else if ( !saveit && found ) {
1246                         /* send DELETE */
1247                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1248                 } else if ( !saveit ) {
1249                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1250                 }
1251                 if ( !saveit && found ) {
1252                         /* Decrement s_inuse, was incremented when called
1253                          * with saveit == TRUE
1254                          */
1255                         syncprov_free_syncop( ss );
1256                 }
1257         }
1258         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1259
1260         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1261                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1262                         op->o_bd = &db;
1263                 }
1264                 overlay_entry_release_ov( op, e, 0, on );
1265                 op->o_bd = b0;
1266         }
1267         if ( freefdn ) {
1268                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1269         }
1270         op->o_bd = b0;
1271 }
1272
1273 static int
1274 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1275 {
1276         slap_callback *cb = op->o_callback;
1277         opcookie *opc = cb->sc_private;
1278         slap_overinst *on = opc->son;
1279         syncprov_info_t         *si = on->on_bi.bi_private;
1280         syncmatches *sm, *snext;
1281         modtarget *mt, mtdummy;
1282
1283         for (sm = opc->smatches; sm; sm=snext) {
1284                 snext = sm->sm_next;
1285                 syncprov_free_syncop( sm->sm_op );
1286                 op->o_tmpfree( sm, op->o_tmpmemctx );
1287         }
1288
1289         /* Remove op from lock table */
1290         mtdummy.mt_op = op;
1291         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1292         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1293         if ( mt ) {
1294                 modinst *mi = mt->mt_mods;
1295
1296                 /* If there are more, promote the next one */
1297                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1298                 if ( mi->mi_next ) {
1299                         mt->mt_mods = mi->mi_next;
1300                         mt->mt_op = mt->mt_mods->mi_op;
1301                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1302                 } else {
1303                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1304                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1305                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1306                         ch_free( mt );
1307                 }
1308         }
1309         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1310         if ( !BER_BVISNULL( &opc->suuid ))
1311                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1312         if ( !BER_BVISNULL( &opc->sndn ))
1313                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1314         if ( !BER_BVISNULL( &opc->sdn ))
1315                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1316         op->o_callback = cb->sc_next;
1317         op->o_tmpfree(cb, op->o_tmpmemctx);
1318
1319         return 0;
1320 }
1321
1322 static void
1323 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1324 {
1325         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1326         Modifications mod;
1327         Operation opm;
1328         SlapReply rsm = { 0 };
1329         slap_callback cb = {0};
1330         BackendDB be;
1331 #ifdef CHECK_CSN
1332         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1333
1334         int i;
1335         for ( i=0; i<si->si_numcsns; i++ ) {
1336                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1337         }
1338 #endif
1339         mod.sml_numvals = si->si_numcsns;
1340         mod.sml_values = si->si_ctxcsn;
1341         mod.sml_nvalues = NULL;
1342         mod.sml_desc = slap_schema.si_ad_contextCSN;
1343         mod.sml_op = LDAP_MOD_REPLACE;
1344         mod.sml_flags = SLAP_MOD_INTERNAL;
1345         mod.sml_next = NULL;
1346
1347         cb.sc_response = slap_null_cb;
1348         opm = *op;
1349         opm.o_tag = LDAP_REQ_MODIFY;
1350         opm.o_callback = &cb;
1351         opm.orm_modlist = &mod;
1352         opm.orm_no_opattrs = 1;
1353         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1354                 be = *on->on_info->oi_origdb;
1355                 opm.o_bd = &be;
1356         }
1357         opm.o_req_dn = opm.o_bd->be_suffix[0];
1358         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1359         opm.o_bd->bd_info = on->on_info->oi_orig;
1360         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1361         opm.o_no_schema_check = 1;
1362         opm.o_bd->be_modify( &opm, &rsm );
1363         if ( mod.sml_next != NULL ) {
1364                 slap_mods_free( mod.sml_next, 1 );
1365         }
1366 #ifdef CHECK_CSN
1367         for ( i=0; i<si->si_numcsns; i++ ) {
1368                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1369         }
1370 #endif
1371 }
1372
1373 static void
1374 syncprov_add_slog( Operation *op )
1375 {
1376         opcookie *opc = op->o_callback->sc_private;
1377         slap_overinst *on = opc->son;
1378         syncprov_info_t         *si = on->on_bi.bi_private;
1379         sessionlog *sl;
1380         slog_entry *se;
1381
1382         sl = si->si_logs;
1383         {
1384                 /* Allocate a record. UUIDs are not NUL-terminated. */
1385                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1386                         op->o_csn.bv_len + 1 );
1387                 se->se_next = NULL;
1388                 se->se_tag = op->o_tag;
1389
1390                 se->se_uuid.bv_val = (char *)(&se[1]);
1391                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1392                 se->se_uuid.bv_len = opc->suuid.bv_len;
1393
1394                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1395                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1396                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1397                 se->se_csn.bv_len = op->o_csn.bv_len;
1398                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1399
1400                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1401                 if ( sl->sl_head ) {
1402                         sl->sl_tail->se_next = se;
1403                 } else {
1404                         sl->sl_head = se;
1405                 }
1406                 sl->sl_tail = se;
1407                 sl->sl_num++;
1408                 while ( sl->sl_num > sl->sl_size ) {
1409                         se = sl->sl_head;
1410                         sl->sl_head = se->se_next;
1411                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1412                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1413                         ch_free( se );
1414                         sl->sl_num--;
1415                 }
1416                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1417         }
1418 }
1419
1420 /* Just set a flag if we found the matching entry */
1421 static int
1422 playlog_cb( Operation *op, SlapReply *rs )
1423 {
1424         if ( rs->sr_type == REP_SEARCH ) {
1425                 op->o_callback->sc_private = (void *)1;
1426         }
1427         return rs->sr_err;
1428 }
1429
1430 /* enter with sl->sl_mutex locked, release before returning */
1431 static void
1432 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1433         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1434 {
1435         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1436         slog_entry *se;
1437         int i, j, ndel, num, nmods, mmods;
1438         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1439         BerVarray uuids;
1440         struct berval delcsn[2];
1441
1442         if ( !sl->sl_num ) {
1443                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1444                 return;
1445         }
1446
1447         num = sl->sl_num;
1448         i = 0;
1449         nmods = 0;
1450
1451         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1452                 num * UUID_LEN, op->o_tmpmemctx );
1453         uuids[0].bv_val = (char *)(uuids + num + 1);
1454
1455         delcsn[0].bv_len = 0;
1456         delcsn[0].bv_val = cbuf;
1457         BER_BVZERO(&delcsn[1]);
1458
1459         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1460          * and everything else at the end. Do this first so we can
1461          * unlock the list mutex.
1462          */
1463         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1464                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1465         for ( se=sl->sl_head; se; se=se->se_next ) {
1466                 int k;
1467                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1468                 ndel = 1;
1469                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1470                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1471                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1472                                 break;
1473                         }
1474                 }
1475                 if ( ndel <= 0 ) {
1476                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1477                         continue;
1478                 }
1479                 ndel = 0;
1480                 for ( k=0; k<numcsns; k++ ) {
1481                         if ( se->se_sid == sids[k] ) {
1482                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1483                                 break;
1484                         }
1485                 }
1486                 if ( ndel > 0 ) {
1487                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1488                         break;
1489                 }
1490                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1491                         j = i;
1492                         i++;
1493                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1494                         delcsn[0].bv_len = se->se_csn.bv_len;
1495                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1496                 } else {
1497                         nmods++;
1498                         j = num - nmods;
1499                 }
1500                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1501                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1502                 uuids[j].bv_len = UUID_LEN;
1503         }
1504         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1505
1506         ndel = i;
1507
1508         /* Zero out unused slots */
1509         for ( i=ndel; i < num - nmods; i++ )
1510                 uuids[i].bv_len = 0;
1511
1512         /* Mods must be validated to see if they belong in this delete set.
1513          */
1514
1515         mmods = nmods;
1516         /* Strip any duplicates */
1517         for ( i=0; i<nmods; i++ ) {
1518                 for ( j=0; j<ndel; j++ ) {
1519                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1520                                 uuids[num - 1 - i].bv_len = 0;
1521                                 mmods --;
1522                                 break;
1523                         }
1524                 }
1525                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1526                 for ( j=0; j<i; j++ ) {
1527                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1528                                 uuids[num - 1 - i].bv_len = 0;
1529                                 mmods --;
1530                                 break;
1531                         }
1532                 }
1533         }
1534
1535         if ( mmods ) {
1536                 Operation fop;
1537                 SlapReply frs = { REP_RESULT };
1538                 int rc;
1539                 Filter mf, af;
1540                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1541                 slap_callback cb = {0};
1542
1543                 fop = *op;
1544
1545                 fop.o_sync_mode = 0;
1546                 fop.o_callback = &cb;
1547                 fop.ors_limit = NULL;
1548                 fop.ors_tlimit = SLAP_NO_LIMIT;
1549                 fop.ors_attrs = slap_anlist_all_attributes;
1550                 fop.ors_attrsonly = 0;
1551                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1552
1553                 af.f_choice = LDAP_FILTER_AND;
1554                 af.f_next = NULL;
1555                 af.f_and = &mf;
1556                 mf.f_choice = LDAP_FILTER_EQUALITY;
1557                 mf.f_ava = &eq;
1558                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1559                 mf.f_next = fop.ors_filter;
1560
1561                 fop.ors_filter = &af;
1562
1563                 cb.sc_response = playlog_cb;
1564                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1565
1566                 for ( i=ndel; i<num; i++ ) {
1567                         if ( uuids[i].bv_len == 0 ) continue;
1568
1569                         mf.f_av_value = uuids[i];
1570                         cb.sc_private = NULL;
1571                         fop.ors_slimit = 1;
1572                         frs.sr_nentries = 0;
1573                         rc = fop.o_bd->be_search( &fop, &frs );
1574
1575                         /* If entry was not found, add to delete list */
1576                         if ( !cb.sc_private ) {
1577                                 uuids[ndel++] = uuids[i];
1578                         }
1579                 }
1580                 fop.o_bd->bd_info = (BackendInfo *)on;
1581         }
1582         if ( ndel ) {
1583                 struct berval cookie;
1584
1585                 if ( delcsn[0].bv_len ) {
1586                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1587                                 srs->sr_state.sid );
1588
1589                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1590                 }
1591
1592                 uuids[ndel].bv_val = NULL;
1593                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1594                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1595                 if ( delcsn[0].bv_len ) {
1596                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1597                 }
1598         }
1599         op->o_tmpfree( uuids, op->o_tmpmemctx );
1600 }
1601
1602 static int
1603 syncprov_op_response( Operation *op, SlapReply *rs )
1604 {
1605         opcookie *opc = op->o_callback->sc_private;
1606         slap_overinst *on = opc->son;
1607         syncprov_info_t         *si = on->on_bi.bi_private;
1608         syncmatches *sm;
1609
1610         if ( rs->sr_err == LDAP_SUCCESS )
1611         {
1612                 struct berval maxcsn;
1613                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1614                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1615
1616                 /* Update our context CSN */
1617                 cbuf[0] = '\0';
1618                 maxcsn.bv_val = cbuf;
1619                 maxcsn.bv_len = sizeof(cbuf);
1620                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1621
1622                 if ( op->o_dont_replicate &&
1623                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1624                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1625                         /* Catch contextCSN updates from syncrepl. We have to look at
1626                          * all the attribute values, as there may be more than one csn
1627                          * that changed, and only one can be passed in the csn queue.
1628                          */
1629                         Modifications *mod = op->orm_modlist;
1630                         int i, j, sid;
1631
1632                         for ( i=0; i<mod->sml_numvals; i++ ) {
1633                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1634
1635                                 for ( j=0; j<si->si_numcsns; j++ ) {
1636                                         if ( sid == si->si_sids[j] ) {
1637                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1638                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1639                                                         csn_changed = 1;
1640                                                 }
1641                                                 break;
1642                                         }
1643                                 }
1644
1645                                 if ( j == si->si_numcsns ) {
1646                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1647                                         si->si_numcsns++;
1648                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1649                                                 sizeof(int));
1650                                         si->si_sids[j] = sid;
1651                                         csn_changed = 1;
1652                                 }
1653                         }
1654                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1655
1656                         if ( csn_changed ) {
1657                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1658                                 have_psearches = ( si->si_ops != NULL );
1659                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1660
1661                                 if ( have_psearches ) {
1662                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1663                                                 if ( sm->sm_op->s_op->o_abandon )
1664                                                         continue;
1665                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1666                                         }
1667                                 }
1668                         }
1669                         return SLAP_CB_CONTINUE;
1670                 }
1671
1672                 slap_get_commit_csn( op, &maxcsn, &foundit );
1673                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1674                         /* syncrepl queues the CSN values in the db where
1675                          * it is configured , not where the changes are made.
1676                          * So look for a value in the glue db if we didn't
1677                          * find any in this db.
1678                          */
1679                         BackendDB *be = op->o_bd;
1680                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1681                         maxcsn.bv_val = cbuf;
1682                         maxcsn.bv_len = sizeof(cbuf);
1683                         slap_get_commit_csn( op, &maxcsn, &foundit );
1684                         op->o_bd = be;
1685                 }
1686                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1687                         int i, sid;
1688 #ifdef CHECK_CSN
1689                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1690                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1691 #endif
1692                         sid = slap_parse_csn_sid( &maxcsn );
1693                         for ( i=0; i<si->si_numcsns; i++ ) {
1694                                 if ( sid == si->si_sids[i] ) {
1695                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1696                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1697                                                 csn_changed = 1;
1698                                         }
1699                                         break;
1700                                 }
1701                         }
1702                         /* It's a new SID for us */
1703                         if ( i == si->si_numcsns ) {
1704                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1705                                 csn_changed = 1;
1706                                 si->si_numcsns++;
1707                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1708                                         sizeof(int));
1709                                 si->si_sids[i] = sid;
1710                         }
1711                 } else if ( !foundit ) {
1712                         /* internal ops that aren't meant to be replicated */
1713                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1714                         return SLAP_CB_CONTINUE;
1715                 }
1716
1717                 /* Don't do any processing for consumer contextCSN updates */
1718                 if ( op->o_dont_replicate ) {
1719                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1720                         return SLAP_CB_CONTINUE;
1721                 }
1722
1723                 si->si_numops++;
1724                 if ( si->si_chkops || si->si_chktime ) {
1725                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1726                                 do_check = 1;
1727                                 si->si_numops = 0;
1728                         }
1729                         if ( si->si_chktime &&
1730                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1731                                 if ( si->si_chklast ) {
1732                                         do_check = 1;
1733                                         si->si_chklast = op->o_time;
1734                                 } else {
1735                                         si->si_chklast = 1;
1736                                 }
1737                         }
1738                 }
1739                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1740
1741                 if ( do_check ) {
1742                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1743                         syncprov_checkpoint( op, rs, on );
1744                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1745                 }
1746
1747                 /* only update consumer ctx if this is a newer csn */
1748                 if ( csn_changed ) {
1749                         opc->sctxcsn = maxcsn;
1750                 }
1751
1752                 /* Handle any persistent searches */
1753                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1754                 have_psearches = ( si->si_ops != NULL );
1755                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1756                 if ( have_psearches ) {
1757                         switch(op->o_tag) {
1758                         case LDAP_REQ_ADD:
1759                         case LDAP_REQ_MODIFY:
1760                         case LDAP_REQ_MODRDN:
1761                         case LDAP_REQ_EXTENDED:
1762                                 syncprov_matchops( op, opc, 0 );
1763                                 break;
1764                         case LDAP_REQ_DELETE:
1765                                 /* for each match in opc->smatches:
1766                                  *   send DELETE msg
1767                                  */
1768                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1769                                         if ( sm->sm_op->s_op->o_abandon )
1770                                                 continue;
1771                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1772                                 }
1773                                 break;
1774                         }
1775                 }
1776
1777                 /* Add any log records */
1778                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1779                         syncprov_add_slog( op );
1780                 }
1781
1782         }
1783         return SLAP_CB_CONTINUE;
1784 }
1785
1786 /* We don't use a subentry to store the context CSN any more.
1787  * We expose the current context CSN as an operational attribute
1788  * of the suffix entry.
1789  */
1790 static int
1791 syncprov_op_compare( Operation *op, SlapReply *rs )
1792 {
1793         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1794         syncprov_info_t         *si = on->on_bi.bi_private;
1795         int rc = SLAP_CB_CONTINUE;
1796
1797         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1798                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1799         {
1800                 Entry e = {0};
1801                 Attribute a = {0};
1802
1803                 e.e_name = op->o_bd->be_suffix[0];
1804                 e.e_nname = op->o_bd->be_nsuffix[0];
1805                 e.e_attrs = &a;
1806
1807                 a.a_desc = slap_schema.si_ad_contextCSN;
1808
1809                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1810
1811                 a.a_vals = si->si_ctxcsn;
1812                 a.a_nvals = a.a_vals;
1813                 a.a_numvals = si->si_numcsns;
1814
1815                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1816                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1817                 if ( ! rs->sr_err ) {
1818                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1819                         goto return_results;
1820                 }
1821
1822                 if ( get_assert( op ) &&
1823                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1824                 {
1825                         rs->sr_err = LDAP_ASSERTION_FAILED;
1826                         goto return_results;
1827                 }
1828
1829
1830                 rs->sr_err = LDAP_COMPARE_FALSE;
1831
1832                 if ( attr_valfind( &a,
1833                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1834                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1835                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1836                 {
1837                         rs->sr_err = LDAP_COMPARE_TRUE;
1838                 }
1839
1840 return_results:;
1841
1842                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1843
1844                 send_ldap_result( op, rs );
1845
1846                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1847                         rs->sr_err = LDAP_SUCCESS;
1848                 }
1849                 rc = rs->sr_err;
1850         }
1851
1852         return rc;
1853 }
1854
1855 static int
1856 syncprov_op_mod( Operation *op, SlapReply *rs )
1857 {
1858         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1859         syncprov_info_t         *si = on->on_bi.bi_private;
1860         slap_callback *cb;
1861         opcookie *opc;
1862         int have_psearches, cbsize;
1863
1864         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1865         have_psearches = ( si->si_ops != NULL );
1866         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1867
1868         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1869                 (have_psearches ? sizeof(modinst) : 0 );
1870
1871         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1872         opc = (opcookie *)(cb+1);
1873         opc->son = on;
1874         cb->sc_response = syncprov_op_response;
1875         cb->sc_cleanup = syncprov_op_cleanup;
1876         cb->sc_private = opc;
1877         cb->sc_next = op->o_callback;
1878         op->o_callback = cb;
1879
1880         /* If there are active persistent searches, lock this operation.
1881          * See seqmod.c for the locking logic on its own.
1882          */
1883         if ( have_psearches ) {
1884                 modtarget *mt, mtdummy;
1885                 modinst *mi;
1886
1887                 mi = (modinst *)(opc+1);
1888                 mi->mi_op = op;
1889
1890                 /* See if we're already modifying this entry... */
1891                 mtdummy.mt_op = op;
1892                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1893                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1894                 if ( mt ) {
1895                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1896                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1897                         mt->mt_tail->mi_next = mi;
1898                         mt->mt_tail = mi;
1899                         /* wait for this op to get to head of list */
1900                         while ( mt->mt_mods != mi ) {
1901                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1902                                 /* FIXME: if dynamic config can delete overlays or
1903                                  * databases we'll have to check for cleanup here.
1904                                  * Currently it's not an issue because there are
1905                                  * no dynamic config deletes...
1906                                  */
1907                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1908                                         ldap_pvt_thread_yield();
1909                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1910
1911                                 /* clean up if the caller is giving up */
1912                                 if ( op->o_abandon ) {
1913                                         modinst *m2;
1914                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1915                                                 m2 = m2->mi_next );
1916                                         m2->mi_next = mi->mi_next;
1917                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1918                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1919                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1920                                         return SLAPD_ABANDON;
1921                                 }
1922                         }
1923                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1924                 } else {
1925                         /* Record that we're modifying this entry now */
1926                         mt = ch_malloc( sizeof(modtarget) );
1927                         mt->mt_mods = mi;
1928                         mt->mt_tail = mi;
1929                         mt->mt_op = mi->mi_op;
1930                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1931                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1932                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1933                 }
1934         }
1935
1936         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1937                 syncprov_matchops( op, opc, 1 );
1938
1939         return SLAP_CB_CONTINUE;
1940 }
1941
1942 static int
1943 syncprov_op_extended( Operation *op, SlapReply *rs )
1944 {
1945         if ( exop_is_write( op ))
1946                 return syncprov_op_mod( op, rs );
1947
1948         return SLAP_CB_CONTINUE;
1949 }
1950
1951 typedef struct searchstate {
1952         slap_overinst *ss_on;
1953         syncops *ss_so;
1954         BerVarray ss_ctxcsn;
1955         int *ss_sids;
1956         int ss_numcsns;
1957 #define SS_PRESENT      0x01
1958 #define SS_CHANGED      0x02
1959         int ss_flags;
1960 } searchstate;
1961
1962 static int
1963 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1964 {
1965         if ( rs->sr_ctrls ) {
1966                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1967                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1968                 rs->sr_ctrls = NULL;
1969         }
1970         return 0;
1971 }
1972
1973 typedef struct SyncOperationBuffer {
1974         Operation               sob_op;
1975         Opheader                sob_hdr;
1976         OpExtra                 sob_oe;
1977         AttributeName   sob_extra;      /* not always present */
1978         /* Further data allocated here */
1979 } SyncOperationBuffer;
1980
1981 static void
1982 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1983 {
1984         SyncOperationBuffer *sopbuf2;
1985         Operation *op2;
1986         int i, alen = 0;
1987         size_t size;
1988         char *ptr;
1989         GroupAssertion *g1, *g2;
1990
1991         /* count the search attrs */
1992         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1993                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1994         }
1995         /* Make a new copy of the operation */
1996         size = offsetof( SyncOperationBuffer, sob_extra ) +
1997                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1998                 op->o_req_dn.bv_len + 1 +
1999                 op->o_req_ndn.bv_len + 1 +
2000                 op->o_ndn.bv_len + 1 +
2001                 so->s_filterstr.bv_len + 1;
2002         sopbuf2 = ch_calloc( 1, size );
2003         op2 = &sopbuf2->sob_op;
2004         op2->o_hdr = &sopbuf2->sob_hdr;
2005         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2006
2007         /* Copy the fields we care about explicitly, leave the rest alone */
2008         *op2->o_hdr = *op->o_hdr;
2009         op2->o_tag = op->o_tag;
2010         op2->o_time = op->o_time;
2011         op2->o_bd = on->on_info->oi_origdb;
2012         op2->o_request = op->o_request;
2013         op2->o_managedsait = op->o_managedsait;
2014         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2015         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2016
2017         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2018         if ( i ) {
2019                 op2->ors_attrs = (AttributeName *) ptr;
2020                 ptr = (char *) &op2->ors_attrs[i+1];
2021                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2022                         op2->ors_attrs[i] = op->ors_attrs[i];
2023                         op2->ors_attrs[i].an_name.bv_val = ptr;
2024                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2025                 }
2026                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2027         }
2028
2029         op2->o_authz = op->o_authz;
2030         op2->o_ndn.bv_val = ptr;
2031         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2032         op2->o_dn = op2->o_ndn;
2033         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2034         op2->o_req_dn.bv_val = ptr;
2035         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2036         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2037         op2->o_req_ndn.bv_val = ptr;
2038         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2039         op2->ors_filterstr.bv_val = ptr;
2040         strcpy( ptr, so->s_filterstr.bv_val );
2041         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2042
2043         /* Skip the AND/GE clause that we stuck on in front */
2044         if ( so->s_flags & PS_FIX_FILTER ) {
2045                 op2->ors_filter = op->ors_filter->f_and->f_next;
2046                 so->s_flags ^= PS_FIX_FILTER;
2047         } else {
2048                 op2->ors_filter = op->ors_filter;
2049         }
2050         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2051         so->s_op = op2;
2052
2053         /* Copy any cached group ACLs individually */
2054         op2->o_groups = NULL;
2055         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2056                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2057                 *g2 = *g1;
2058                 strcpy( g2->ga_ndn, g1->ga_ndn );
2059                 g2->ga_next = op2->o_groups;
2060                 op2->o_groups = g2;
2061         }
2062         /* Don't allow any further group caching */
2063         op2->o_do_not_cache = 1;
2064
2065         /* Add op2 to conn so abandon will find us */
2066         op->o_conn->c_n_ops_executing++;
2067         op->o_conn->c_n_ops_completed--;
2068         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2069         so->s_flags |= PS_IS_DETACHED;
2070
2071         /* Prevent anyone else from trying to send a result for this op */
2072         op->o_abandon = 1;
2073 }
2074
2075 static int
2076 syncprov_search_response( Operation *op, SlapReply *rs )
2077 {
2078         searchstate *ss = op->o_callback->sc_private;
2079         slap_overinst *on = ss->ss_on;
2080         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2081         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2082
2083         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2084                 Attribute *a;
2085                 /* If we got a referral without a referral object, there's
2086                  * something missing that we cannot replicate. Just ignore it.
2087                  * The consumer will abort because we didn't send the expected
2088                  * control.
2089                  */
2090                 if ( !rs->sr_entry ) {
2091                         assert( rs->sr_entry != NULL );
2092                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2093                         return SLAP_CB_CONTINUE;
2094                 }
2095                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2096                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2097                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2098                 }
2099                 if ( a ) {
2100                         int i, sid;
2101                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2102
2103                         /* Don't send changed entries back to the originator */
2104                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2105                                 Debug( LDAP_DEBUG_SYNC,
2106                                         "Entry %s changed by peer, ignored\n",
2107                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2108                                 return LDAP_SUCCESS;
2109                         }
2110
2111                         /* If not a persistent search */
2112                         if ( !ss->ss_so ) {
2113                                 /* Make sure entry is less than the snapshot'd contextCSN */
2114                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2115                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2116                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2117                                                 Debug( LDAP_DEBUG_SYNC,
2118                                                         "Entry %s CSN %s greater than snapshot %s\n",
2119                                                         rs->sr_entry->e_name.bv_val,
2120                                                         a->a_nvals[0].bv_val,
2121                                                         ss->ss_ctxcsn[i].bv_val );
2122                                                 return LDAP_SUCCESS;
2123                                         }
2124                                 }
2125                         }
2126
2127                         /* Don't send old entries twice */
2128                         if ( srs->sr_state.ctxcsn ) {
2129                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2130                                         if ( sid == srs->sr_state.sids[i] &&
2131                                                 ber_bvcmp( &a->a_nvals[0],
2132                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2133                                                 Debug( LDAP_DEBUG_SYNC,
2134                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2135                                                         rs->sr_entry->e_name.bv_val,
2136                                                         a->a_nvals[0].bv_val,
2137                                                         srs->sr_state.ctxcsn[i].bv_val );
2138                                                 return LDAP_SUCCESS;
2139                                         }
2140                                 }
2141                         }
2142                 }
2143                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2144                         op->o_tmpmemctx );
2145                 rs->sr_ctrls[1] = NULL;
2146                 /* If we're in delta-sync mode, always send a cookie */
2147                 if ( si->si_nopres && si->si_usehint && a ) {
2148                         struct berval cookie;
2149                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2150                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2151                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2152                 } else {
2153                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2154                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2155                 }
2156         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2157                 struct berval cookie;
2158
2159                 if ( ss->ss_flags & SS_CHANGED ) {
2160                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2161                                 srs->sr_state.rid, srs->sr_state.sid );
2162
2163                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2164                 }
2165
2166                 /* Is this a regular refresh?
2167                  * Note: refresh never gets here if there were no changes
2168                  */
2169                 if ( !ss->ss_so ) {
2170                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2171                                 op->o_tmpmemctx );
2172                         rs->sr_ctrls[1] = NULL;
2173                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2174                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2175                                         LDAP_SYNC_REFRESH_DELETES );
2176                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2177                 } else {
2178                 /* It's RefreshAndPersist, transition to Persist phase */
2179                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2180                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2181                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2182                                 1, NULL, 0 );
2183                         if ( ss->ss_flags & SS_CHANGED )
2184                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2185
2186                         /* Detach this Op from frontend control */
2187                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2188
2189                         /* But not if this connection was closed along the way */
2190                         if ( op->o_abandon ) {
2191                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2192                                 /* syncprov_ab_cleanup will free this syncop */
2193                                 return SLAPD_ABANDON;
2194
2195                         } else {
2196                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2197                                 /* Turn off the refreshing flag */
2198                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2199
2200                                 syncprov_detach_op( op, ss->ss_so, on );
2201
2202                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2203
2204                                 /* If there are queued responses, fire them off */
2205                                 if ( ss->ss_so->s_res )
2206                                         syncprov_qstart( ss->ss_so );
2207                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2208                         }
2209
2210                         return LDAP_SUCCESS;
2211                 }
2212         }
2213
2214         return SLAP_CB_CONTINUE;
2215 }
2216
2217 static int
2218 syncprov_op_search( Operation *op, SlapReply *rs )
2219 {
2220         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2221         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2222         slap_callback   *cb;
2223         int gotstate = 0, changed = 0, do_present = 0;
2224         syncops *sop = NULL;
2225         searchstate *ss;
2226         sync_control *srs;
2227         BerVarray ctxcsn;
2228         int i, *sids, numcsns;
2229         struct berval mincsn;
2230
2231         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2232
2233         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2234                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2235                 return rs->sr_err;
2236         }
2237
2238         srs = op->o_controls[slap_cids.sc_LDAPsync];
2239
2240         /* If this is a persistent search, set it up right away */
2241         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2242                 syncops so = {0};
2243                 fbase_cookie fc;
2244                 opcookie opc;
2245                 slap_callback sc;
2246
2247                 fc.fss = &so;
2248                 fc.fbase = 0;
2249                 so.s_eid = NOID;
2250                 so.s_op = op;
2251                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2252                 /* syncprov_findbase expects to be called as a callback... */
2253                 sc.sc_private = &opc;
2254                 opc.son = on;
2255                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2256                 cb = op->o_callback;
2257                 op->o_callback = &sc;
2258                 rs->sr_err = syncprov_findbase( op, &fc );
2259                 op->o_callback = cb;
2260                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2261
2262                 if ( rs->sr_err != LDAP_SUCCESS ) {
2263                         send_ldap_result( op, rs );
2264                         return rs->sr_err;
2265                 }
2266                 sop = ch_malloc( sizeof( syncops ));
2267                 *sop = so;
2268                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2269                 sop->s_rid = srs->sr_state.rid;
2270                 sop->s_sid = srs->sr_state.sid;
2271                 sop->s_inuse = 1;
2272
2273                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2274                 sop->s_next = si->si_ops;
2275                 si->si_ops = sop;
2276                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2277         }
2278
2279         /* snapshot the ctxcsn */
2280         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2281         numcsns = si->si_numcsns;
2282         if ( numcsns ) {
2283                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2284                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2285                 for ( i=0; i<numcsns; i++ )
2286                         sids[i] = si->si_sids[i];
2287         } else {
2288                 ctxcsn = NULL;
2289                 sids = NULL;
2290         }
2291         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2292
2293         /* If we have a cookie, handle the PRESENT lookups */
2294         if ( srs->sr_state.ctxcsn ) {
2295                 sessionlog *sl;
2296                 int i, j;
2297
2298                 /* If we don't have any CSN of our own yet, pretend nothing
2299                  * has changed.
2300                  */
2301                 if ( !numcsns )
2302                         goto no_change;
2303
2304                 if ( !si->si_nopres )
2305                         do_present = SS_PRESENT;
2306
2307                 /* If there are SIDs we don't recognize in the cookie, drop them */
2308                 for (i=0; i<srs->sr_state.numcsns; ) {
2309                         for (j=0; j<numcsns; j++) {
2310                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2311                                         break;
2312                                 }
2313                         }
2314                         /* not found */
2315                         if ( j == numcsns ) {
2316                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2317                                 j = srs->sr_state.numcsns - 1;
2318                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2319                                 tmp.bv_len = 0;
2320                                 srs->sr_state.ctxcsn[j] = tmp;
2321                                 srs->sr_state.numcsns = j;
2322                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2323                                 continue;
2324                         }
2325                         i++;
2326                 }
2327
2328                 /* Find the smallest CSN */
2329                 mincsn = srs->sr_state.ctxcsn[0];
2330                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2331                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2332                                 mincsn = srs->sr_state.ctxcsn[i];
2333                 }
2334
2335                 /* If nothing has changed, shortcut it */
2336                 if ( srs->sr_state.numcsns == numcsns ) {
2337                         int i, j;
2338                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2339                                 for ( j=0; j<numcsns; j++ ) {
2340                                         if ( srs->sr_state.sids[i] != sids[j] )
2341                                                 continue;
2342                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2343                                                 changed = SS_CHANGED;
2344                                         break;
2345                                 }
2346                                 if ( changed )
2347                                         break;
2348                         }
2349                         if ( !changed ) {
2350                                 do_present = 0;
2351 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2352                                         LDAPControl     *ctrls[2];
2353
2354                                         ctrls[0] = NULL;
2355                                         ctrls[1] = NULL;
2356                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2357                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2358                                         rs->sr_ctrls = ctrls;
2359                                         rs->sr_err = LDAP_SUCCESS;
2360                                         send_ldap_result( op, rs );
2361                                         rs->sr_ctrls = NULL;
2362                                         return rs->sr_err;
2363                                 }
2364                                 goto shortcut;
2365                         }
2366                 } else {
2367                         /* consumer doesn't have the right number of CSNs */
2368                         changed = SS_CHANGED;
2369                 }
2370                 /* Do we have a sessionlog for this search? */
2371                 sl=si->si_logs;
2372                 if ( sl ) {
2373                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2374                         /* Are there any log entries, and is the consumer state
2375                          * present in the session log?
2376                          */
2377                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2378                                 do_present = 0;
2379                                 /* mutex is unlocked in playlog */
2380                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2381                         } else {
2382                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2383                         }
2384                 }
2385                 /* Is the CSN still present in the database? */
2386                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2387                         /* No, so a reload is required */
2388                         /* the 2.2 consumer doesn't send this hint */
2389                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2390                                 if ( ctxcsn )
2391                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2392                                 if ( sids )
2393                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2394                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2395                                 return rs->sr_err;
2396                         }
2397                         if ( srs->sr_state.ctxcsn ) {
2398                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2399                                 srs->sr_state.ctxcsn = NULL;
2400                         }
2401                         if ( srs->sr_state.sids ) {
2402                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2403                                 srs->sr_state.sids = NULL;
2404                         }
2405                         srs->sr_state.numcsns = 0;
2406                 } else {
2407                         gotstate = 1;
2408                         /* If changed and doing Present lookup, send Present UUIDs */
2409                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2410                                 LDAP_SUCCESS ) {
2411                                 if ( ctxcsn )
2412                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2413                                 if ( sids )
2414                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2415                                 send_ldap_result( op, rs );
2416                                 return rs->sr_err;
2417                         }
2418                 }
2419         } else {
2420                 /* No consumer state, assume something has changed */
2421                 changed = SS_CHANGED;
2422         }
2423
2424 shortcut:
2425         /* Append CSN range to search filter, save original filter
2426          * for persistent search evaluation
2427          */
2428         if ( sop ) {
2429                 sop->s_filterstr= op->ors_filterstr;
2430         }
2431
2432         /* If something changed, find the changes */
2433         if ( gotstate && changed ) {
2434                 Filter *fand, *fava;
2435
2436                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2437                 fand->f_choice = LDAP_FILTER_AND;
2438                 fand->f_next = NULL;
2439                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2440                 fand->f_and = fava;
2441                 fava->f_choice = LDAP_FILTER_GE;
2442                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2443                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2444 #ifdef LDAP_COMP_MATCH
2445                 fava->f_ava->aa_cf = NULL;
2446 #endif
2447                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2448                 fava->f_next = op->ors_filter;
2449                 op->ors_filter = fand;
2450                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2451                 if ( sop )
2452                         sop->s_flags |= PS_FIX_FILTER;
2453         }
2454
2455         /* Let our callback add needed info to returned entries */
2456         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2457         ss = (searchstate *)(cb+1);
2458         ss->ss_on = on;
2459         ss->ss_so = sop;
2460         ss->ss_flags = do_present | changed;
2461         ss->ss_ctxcsn = ctxcsn;
2462         ss->ss_numcsns = numcsns;
2463         ss->ss_sids = sids;
2464         cb->sc_response = syncprov_search_response;
2465         cb->sc_cleanup = syncprov_search_cleanup;
2466         cb->sc_private = ss;
2467         cb->sc_next = op->o_callback;
2468         op->o_callback = cb;
2469
2470         /* If this is a persistent search and no changes were reported during
2471          * the refresh phase, just invoke the response callback to transition
2472          * us into persist phase
2473          */
2474         if ( !changed ) {
2475                 rs->sr_err = LDAP_SUCCESS;
2476                 rs->sr_nentries = 0;
2477                 send_ldap_result( op, rs );
2478                 return rs->sr_err;
2479         }
2480         return SLAP_CB_CONTINUE;
2481 }
2482
2483 static int
2484 syncprov_operational(
2485         Operation *op,
2486         SlapReply *rs )
2487 {
2488         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2489         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2490
2491         /* This prevents generating unnecessarily; frontend will strip
2492          * any statically stored copy.
2493          */
2494         if ( op->o_sync != SLAP_CONTROL_NONE )
2495                 return SLAP_CB_CONTINUE;
2496
2497         if ( rs->sr_entry &&
2498                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2499
2500                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2501                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2502                         Attribute *a, **ap = NULL;
2503
2504                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2505                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2506                                         break;
2507                         }
2508
2509                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2510                         if ( si->si_ctxcsn ) {
2511                                 if ( !a ) {
2512                                         for ( ap = &rs->sr_operational_attrs; *ap;
2513                                                 ap=&(*ap)->a_next );
2514
2515                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2516                                         *ap = a;
2517                                 }
2518
2519                                 if ( !ap ) {
2520                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2521                                                 Entry *e = entry_dup( rs->sr_entry );
2522                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2523                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2524                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2525                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2526                                                         entry_free( rs->sr_entry );
2527                                                 }
2528                                                 rs->sr_entry = e;
2529                                                 rs->sr_flags |=
2530                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2531                                                 a = attr_find( rs->sr_entry->e_attrs,
2532                                                         slap_schema.si_ad_contextCSN );
2533                                         }
2534                                         if ( a->a_nvals != a->a_vals ) {
2535                                                 ber_bvarray_free( a->a_nvals );
2536                                         }
2537                                         a->a_nvals = NULL;
2538                                         ber_bvarray_free( a->a_vals );
2539                                         a->a_vals = NULL;
2540                                         a->a_numvals = 0;
2541                                 }
2542                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2543                         }
2544                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2545                 }
2546         }
2547         return SLAP_CB_CONTINUE;
2548 }
2549
2550 enum {
2551         SP_CHKPT = 1,
2552         SP_SESSL,
2553         SP_NOPRES,
2554         SP_USEHINT
2555 };
2556
2557 static ConfigDriver sp_cf_gen;
2558
2559 static ConfigTable spcfg[] = {
2560         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2561                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2562                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2563                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2564         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2565                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2566                         "DESC 'Session log size in ops' "
2567                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2568         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2569                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2570                         "DESC 'Omit Present phase processing' "
2571                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2572         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2573                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2574                         "DESC 'Observe Reload Hint in Request control' "
2575                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2576         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2577 };
2578
2579 static ConfigOCs spocs[] = {
2580         { "( OLcfgOvOc:1.1 "
2581                 "NAME 'olcSyncProvConfig' "
2582                 "DESC 'SyncRepl Provider configuration' "
2583                 "SUP olcOverlayConfig "
2584                 "MAY ( olcSpCheckpoint "
2585                         "$ olcSpSessionlog "
2586                         "$ olcSpNoPresent "
2587                         "$ olcSpReloadHint "
2588                 ") )",
2589                         Cft_Overlay, spcfg },
2590         { NULL, 0, NULL }
2591 };
2592
2593 static int
2594 sp_cf_gen(ConfigArgs *c)
2595 {
2596         slap_overinst           *on = (slap_overinst *)c->bi;
2597         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2598         int rc = 0;
2599
2600         if ( c->op == SLAP_CONFIG_EMIT ) {
2601                 switch ( c->type ) {
2602                 case SP_CHKPT:
2603                         if ( si->si_chkops || si->si_chktime ) {
2604                                 struct berval bv;
2605                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2606                                         "%d %d", si->si_chkops, si->si_chktime );
2607                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2608                                         rc = 1;
2609                                 } else {
2610                                         bv.bv_val = c->cr_msg;
2611                                         value_add_one( &c->rvalue_vals, &bv );
2612                                 }
2613                         } else {
2614                                 rc = 1;
2615                         }
2616                         break;
2617                 case SP_SESSL:
2618                         if ( si->si_logs ) {
2619                                 c->value_int = si->si_logs->sl_size;
2620                         } else {
2621                                 rc = 1;
2622                         }
2623                         break;
2624                 case SP_NOPRES:
2625                         if ( si->si_nopres ) {
2626                                 c->value_int = 1;
2627                         } else {
2628                                 rc = 1;
2629                         }
2630                         break;
2631                 case SP_USEHINT:
2632                         if ( si->si_usehint ) {
2633                                 c->value_int = 1;
2634                         } else {
2635                                 rc = 1;
2636                         }
2637                         break;
2638                 }
2639                 return rc;
2640         } else if ( c->op == LDAP_MOD_DELETE ) {
2641                 switch ( c->type ) {
2642                 case SP_CHKPT:
2643                         si->si_chkops = 0;
2644                         si->si_chktime = 0;
2645                         break;
2646                 case SP_SESSL:
2647                         if ( si->si_logs )
2648                                 si->si_logs->sl_size = 0;
2649                         else
2650                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2651                         break;
2652                 case SP_NOPRES:
2653                         if ( si->si_nopres )
2654                                 si->si_nopres = 0;
2655                         else
2656                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2657                         break;
2658                 case SP_USEHINT:
2659                         if ( si->si_usehint )
2660                                 si->si_usehint = 0;
2661                         else
2662                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2663                         break;
2664                 }
2665                 return rc;
2666         }
2667         switch ( c->type ) {
2668         case SP_CHKPT:
2669                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2670                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2671                                 c->argv[0], c->argv[1] );
2672                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2673                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2674                         return ARG_BAD_CONF;
2675                 }
2676                 if ( si->si_chkops <= 0 ) {
2677                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2678                                 c->argv[0], si->si_chkops );
2679                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2680                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2681                         return ARG_BAD_CONF;
2682                 }
2683                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2684                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2685                                 c->argv[0], c->argv[1] );
2686                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2687                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2688                         return ARG_BAD_CONF;
2689                 }
2690                 if ( si->si_chktime <= 0 ) {
2691                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2692                                 c->argv[0], si->si_chkops );
2693                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2694                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2695                         return ARG_BAD_CONF;
2696                 }
2697                 si->si_chktime *= 60;
2698                 break;
2699         case SP_SESSL: {
2700                 sessionlog *sl;
2701                 int size = c->value_int;
2702
2703                 if ( size < 0 ) {
2704                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2705                                 c->argv[0], size );
2706                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2707                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2708                         return ARG_BAD_CONF;
2709                 }
2710                 sl = si->si_logs;
2711                 if ( !sl ) {
2712                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2713                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2714                         sl->sl_mincsn.bv_len = 0;
2715                         sl->sl_num = 0;
2716                         sl->sl_head = sl->sl_tail = NULL;
2717                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2718                         si->si_logs = sl;
2719                 }
2720                 sl->sl_size = size;
2721                 }
2722                 break;
2723         case SP_NOPRES:
2724                 si->si_nopres = c->value_int;
2725                 break;
2726         case SP_USEHINT:
2727                 si->si_usehint = c->value_int;
2728                 break;
2729         }
2730         return rc;
2731 }
2732
2733 /* ITS#3456 we cannot run this search on the main thread, must use a
2734  * child thread in order to insure we have a big enough stack.
2735  */
2736 static void *
2737 syncprov_db_otask(
2738         void *ptr
2739 )
2740 {
2741         syncprov_findcsn( ptr, FIND_MAXCSN );
2742         return NULL;
2743 }
2744
2745 /* Read any existing contextCSN from the underlying db.
2746  * Then search for any entries newer than that. If no value exists,
2747  * just generate it. Cache whatever result.
2748  */
2749 static int
2750 syncprov_db_open(
2751         BackendDB *be,
2752         ConfigReply *cr
2753 )
2754 {
2755         slap_overinst   *on = (slap_overinst *) be->bd_info;
2756         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2757
2758         Connection conn = { 0 };
2759         OperationBuffer opbuf;
2760         Operation *op;
2761         Entry *e = NULL;
2762         Attribute *a;
2763         int rc;
2764         void *thrctx = NULL;
2765
2766         if ( !SLAP_LASTMOD( be )) {
2767                 Debug( LDAP_DEBUG_ANY,
2768                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2769                 return -1;
2770         }
2771
2772         if ( slapMode & SLAP_TOOL_MODE ) {
2773                 return 0;
2774         }
2775
2776         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2777         if ( rc ) {
2778                 return rc;
2779         }
2780
2781         thrctx = ldap_pvt_thread_pool_context();
2782         connection_fake_init( &conn, &opbuf, thrctx );
2783         op = &opbuf.ob_op;
2784         op->o_bd = be;
2785         op->o_dn = be->be_rootdn;
2786         op->o_ndn = be->be_rootndn;
2787
2788         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2789                 slap_schema.si_ad_contextCSN, 0, &e, on );
2790
2791         if ( e ) {
2792                 ldap_pvt_thread_t tid;
2793
2794                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2795                 if ( a ) {
2796                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2797                         si->si_numcsns = a->a_numvals;
2798                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2799                 }
2800                 overlay_entry_release_ov( op, e, 0, on );
2801                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2802                         op->o_req_dn = be->be_suffix[0];
2803                         op->o_req_ndn = be->be_nsuffix[0];
2804                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2805                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2806                         ldap_pvt_thread_join( tid, NULL );
2807                 }
2808         }
2809
2810         /* Didn't find a contextCSN, should we generate one? */
2811         if ( !si->si_ctxcsn ) {
2812                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2813                 struct berval csn;
2814
2815                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2816                 /* If we're also a consumer, then don't generate anything.
2817                  * Wait for our provider to send it to us, or for a local
2818                  * modify if we have multimaster.
2819                  */
2820                         goto out;
2821                 }
2822                 csn.bv_val = csnbuf;
2823                 csn.bv_len = sizeof( csnbuf );
2824                 slap_get_csn( op, &csn, 0 );
2825                 value_add_one( &si->si_ctxcsn, &csn );
2826                 si->si_numcsns = 1;
2827                 si->si_sids = ch_malloc( sizeof(int) );
2828                 si->si_sids[0] = slap_serverID;
2829
2830                 /* make sure we do a checkpoint on close */
2831                 si->si_numops++;
2832         }
2833
2834 out:
2835         op->o_bd->bd_info = (BackendInfo *)on;
2836         return 0;
2837 }
2838
2839 /* Write the current contextCSN into the underlying db.
2840  */
2841 static int
2842 syncprov_db_close(
2843         BackendDB *be,
2844         ConfigReply *cr
2845 )
2846 {
2847     slap_overinst   *on = (slap_overinst *) be->bd_info;
2848     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2849
2850         if ( slapMode & SLAP_TOOL_MODE ) {
2851                 return 0;
2852         }
2853         if ( si->si_numops ) {
2854                 Connection conn = {0};
2855                 OperationBuffer opbuf;
2856                 Operation *op;
2857                 SlapReply rs = {REP_RESULT};
2858                 void *thrctx;
2859
2860                 thrctx = ldap_pvt_thread_pool_context();
2861                 connection_fake_init( &conn, &opbuf, thrctx );
2862                 op = &opbuf.ob_op;
2863                 op->o_bd = be;
2864                 op->o_dn = be->be_rootdn;
2865                 op->o_ndn = be->be_rootndn;
2866                 syncprov_checkpoint( op, &rs, on );
2867         }
2868
2869     return 0;
2870 }
2871
2872 static int
2873 syncprov_db_init(
2874         BackendDB *be,
2875         ConfigReply *cr
2876 )
2877 {
2878         slap_overinst   *on = (slap_overinst *)be->bd_info;
2879         syncprov_info_t *si;
2880
2881         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2882                 Debug( LDAP_DEBUG_ANY,
2883                         "syncprov must be instantiated within a database.\n",
2884                         0, 0, 0 );
2885                 return 1;
2886         }
2887
2888         si = ch_calloc(1, sizeof(syncprov_info_t));
2889         on->on_bi.bi_private = si;
2890         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2891         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2892         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2893
2894         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2895         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2896         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2897         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2898
2899         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2900         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2901
2902         return 0;
2903 }
2904
2905 static int
2906 syncprov_db_destroy(
2907         BackendDB *be,
2908         ConfigReply *cr
2909 )
2910 {
2911         slap_overinst   *on = (slap_overinst *)be->bd_info;
2912         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2913
2914         if ( si ) {
2915                 if ( si->si_logs ) {
2916                         slog_entry *se = si->si_logs->sl_head;
2917
2918                         while ( se ) {
2919                                 slog_entry *se_next = se->se_next;
2920                                 ch_free( se );
2921                                 se = se_next;
2922                         }
2923
2924                         ch_free( si->si_logs );
2925                 }
2926                 if ( si->si_ctxcsn )
2927                         ber_bvarray_free( si->si_ctxcsn );
2928                 if ( si->si_sids )
2929                         ch_free( si->si_sids );
2930                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2931                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2932                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2933                 ch_free( si );
2934         }
2935
2936         return 0;
2937 }
2938
2939 static int syncprov_parseCtrl (
2940         Operation *op,
2941         SlapReply *rs,
2942         LDAPControl *ctrl )
2943 {
2944         ber_tag_t tag;
2945         BerElementBuffer berbuf;
2946         BerElement *ber = (BerElement *)&berbuf;
2947         ber_int_t mode;
2948         ber_len_t len;
2949         struct berval cookie = BER_BVNULL;
2950         sync_control *sr;
2951         int rhint = 0;
2952
2953         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2954                 rs->sr_text = "Sync control specified multiple times";
2955                 return LDAP_PROTOCOL_ERROR;
2956         }
2957
2958         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2959                 rs->sr_text = "Sync control specified with pagedResults control";
2960                 return LDAP_PROTOCOL_ERROR;
2961         }
2962
2963         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2964                 rs->sr_text = "Sync control value is absent";
2965                 return LDAP_PROTOCOL_ERROR;
2966         }
2967
2968         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2969                 rs->sr_text = "Sync control value is empty";
2970                 return LDAP_PROTOCOL_ERROR;
2971         }
2972
2973         /* Parse the control value
2974          *      syncRequestValue ::= SEQUENCE {
2975          *              mode   ENUMERATED {
2976          *                      -- 0 unused
2977          *                      refreshOnly             (1),
2978          *                      -- 2 reserved
2979          *                      refreshAndPersist       (3)
2980          *              },
2981          *              cookie  syncCookie OPTIONAL
2982          *      }
2983          */
2984
2985         ber_init2( ber, &ctrl->ldctl_value, 0 );
2986
2987         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2988                 rs->sr_text = "Sync control : mode decoding error";
2989                 return LDAP_PROTOCOL_ERROR;
2990         }
2991
2992         switch( mode ) {
2993         case LDAP_SYNC_REFRESH_ONLY:
2994                 mode = SLAP_SYNC_REFRESH;
2995                 break;
2996         case LDAP_SYNC_REFRESH_AND_PERSIST:
2997                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2998                 break;
2999         default:
3000                 rs->sr_text = "Sync control : unknown update mode";
3001                 return LDAP_PROTOCOL_ERROR;
3002         }
3003
3004         tag = ber_peek_tag( ber, &len );
3005
3006         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3007                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3008                         rs->sr_text = "Sync control : cookie decoding error";
3009                         return LDAP_PROTOCOL_ERROR;
3010                 }
3011                 tag = ber_peek_tag( ber, &len );
3012         }
3013         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3014                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3015                         rs->sr_text = "Sync control : rhint decoding error";
3016                         return LDAP_PROTOCOL_ERROR;
3017                 }
3018         }
3019         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3020                         rs->sr_text = "Sync control : decoding error";
3021                         return LDAP_PROTOCOL_ERROR;
3022         }
3023         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3024         sr->sr_rhint = rhint;
3025         if (!BER_BVISNULL(&cookie)) {
3026                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3027                 /* If parse fails, pretend no cookie was sent */
3028                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3029                         sr->sr_state.rid == -1 ) {
3030                         if ( sr->sr_state.ctxcsn ) {
3031                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3032                                 sr->sr_state.ctxcsn = NULL;
3033                         }
3034                         sr->sr_state.numcsns = 0;
3035                 }
3036         }
3037
3038         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3039
3040         op->o_sync = ctrl->ldctl_iscritical
3041                 ? SLAP_CONTROL_CRITICAL
3042                 : SLAP_CONTROL_NONCRITICAL;
3043
3044         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3045
3046         return LDAP_SUCCESS;
3047 }
3048
3049 /* This overlay is set up for dynamic loading via moduleload. For static
3050  * configuration, you'll need to arrange for the slap_overinst to be
3051  * initialized and registered by some other function inside slapd.
3052  */
3053
3054 static slap_overinst            syncprov;
3055
3056 int
3057 syncprov_initialize()
3058 {
3059         int rc;
3060
3061         rc = register_supported_control( LDAP_CONTROL_SYNC,
3062                 SLAP_CTRL_SEARCH, NULL,
3063                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3064         if ( rc != LDAP_SUCCESS ) {
3065                 Debug( LDAP_DEBUG_ANY,
3066                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3067                 return rc;
3068         }
3069
3070         syncprov.on_bi.bi_type = "syncprov";
3071         syncprov.on_bi.bi_db_init = syncprov_db_init;
3072         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3073         syncprov.on_bi.bi_db_open = syncprov_db_open;
3074         syncprov.on_bi.bi_db_close = syncprov_db_close;
3075
3076         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3077         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3078
3079         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3080         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3081         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3082         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3083         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3084         syncprov.on_bi.bi_op_search = syncprov_op_search;
3085         syncprov.on_bi.bi_extended = syncprov_op_extended;
3086         syncprov.on_bi.bi_operational = syncprov_operational;
3087
3088         syncprov.on_bi.bi_cf_ocs = spocs;
3089
3090         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3091
3092         rc = config_register_schema( spcfg, spocs );
3093         if ( rc ) return rc;
3094
3095         return overlay_register( &syncprov );
3096 }
3097
3098 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3099 int
3100 init_module( int argc, char *argv[] )
3101 {
3102         return syncprov_initialize();
3103 }
3104 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3105
3106 #endif /* defined(SLAPD_OVER_SYNCPROV) */