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 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         /* Use basic parameters from syncrepl search, but use
 397          * current op's threadctx / tmpmemctx
 398          */
 399         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 400         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 401                 slap_callback cb = {0};
 402                 Operation fop;
 403                 SlapReply frs = { REP_RESULT };
 404                 int rc;
 405
 406                 fc->fss->s_flags ^= PS_FIND_BASE;
 407                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 408
 409                 fop = *fc->fss->s_op;
 410
 411                 fop.o_bd = fop.o_bd->bd_self;
 412                 fop.o_hdr = op->o_hdr;
 413                 fop.o_time = op->o_time;
 414                 fop.o_tincr = op->o_tincr;
 415
 416                 cb.sc_response = findbase_cb;
 417                 cb.sc_private = fc;
 418
 419                 fop.o_sync_mode = 0;    /* turn off sync mode */
 420                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 421                 fop.o_callback = &cb;
 422                 fop.o_tag = LDAP_REQ_SEARCH;
 423                 fop.ors_scope = LDAP_SCOPE_BASE;
 424                 fop.ors_limit = NULL;
 425                 fop.ors_slimit = 1;
 426                 fop.ors_tlimit = SLAP_NO_LIMIT;
 427                 fop.ors_attrs = slap_anlist_no_attrs;
 428                 fop.ors_attrsonly = 1;
 429                 fop.ors_filter = &generic_filter;
 430                 fop.ors_filterstr = generic_filterstr;
 431
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433         } else {
 434                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 435                 fc->fbase = 1;
 436         }
 437
 438         /* After the first call, see if the fdn resides in the scope */
 439         if ( fc->fbase == 1 ) {
 440                 switch ( fc->fss->s_op->ors_scope ) {
 441                 case LDAP_SCOPE_BASE:
 442                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 443                         break;
 444                 case LDAP_SCOPE_ONELEVEL: {
 445                         struct berval pdn;
 446                         dnParent( fc->fdn, &pdn );
 447                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 448                         break; }
 449                 case LDAP_SCOPE_SUBTREE:
 450                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 451                         break;
 452                 case LDAP_SCOPE_SUBORDINATE:
 453                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 454                                 !dn_match( fc->fdn, &fc->fss->s_base );
 455                         break;
 456                 }
 457         }
 458
 459         if ( fc->fbase )
 460                 return LDAP_SUCCESS;
 461
 462         /* If entryID has changed, then the base of this search has
 463          * changed. Invalidate the psearch.
 464          */
 465         return LDAP_NO_SUCH_OBJECT;
 466 }
 467
 468 /* syncprov_findcsn:
 469  *   This function has three different purposes, but they all use a search
 470  * that filters on entryCSN so they're combined here.
 471  * 1: at startup time, after a contextCSN has been read from the database,
 472  * we search for all entries with CSN >= contextCSN in case the contextCSN
 473  * was not checkpointed at the previous shutdown.
 474  *
 475  * 2: when the current contextCSN is known and we have a sync cookie, we search
 476  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 477  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 478  *
 479  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 480  * CSN, and generate Present records for them. We always collect this result
 481  * in SyncID sets, even if there's only one match.
 482  */
 483 typedef enum find_csn_t {
 484         FIND_MAXCSN     = 1,
 485         FIND_CSN        = 2,
 486         FIND_PRESENT    = 3
 487 } find_csn_t;
 488
 489 static int
 490 findmax_cb( Operation *op, SlapReply *rs )
 491 {
 492         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 493                 struct berval *maxcsn = op->o_callback->sc_private;
 494                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 495                         slap_schema.si_ad_entryCSN );
 496
 497                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 498                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 499                         maxcsn->bv_len = a->a_vals[0].bv_len;
 500                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 501                 }
 502         }
 503         return LDAP_SUCCESS;
 504 }
 505
 506 static int
 507 findcsn_cb( Operation *op, SlapReply *rs )
 508 {
 509         slap_callback *sc = op->o_callback;
 510
 511         /* We just want to know that at least one exists, so it's OK if
 512          * we exceed the unchecked limit.
 513          */
 514         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 515                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 516                 sc->sc_private = (void *)1;
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 /* Build a list of entryUUIDs for sending in a SyncID set */
 522
 523 #define UUID_LEN        16
 524
 525 typedef struct fpres_cookie {
 526         int num;
 527         BerVarray uuids;
 528         char *last;
 529 } fpres_cookie;
 530
 531 static int
 532 findpres_cb( Operation *op, SlapReply *rs )
 533 {
 534         slap_callback *sc = op->o_callback;
 535         fpres_cookie *pc = sc->sc_private;
 536         Attribute *a;
 537         int ret = SLAP_CB_CONTINUE;
 538
 539         switch ( rs->sr_type ) {
 540         case REP_SEARCH:
 541                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 542                 if ( a ) {
 543                         pc->uuids[pc->num].bv_val = pc->last;
 544                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 545                                 pc->uuids[pc->num].bv_len );
 546                         pc->num++;
 547                         pc->last = pc->uuids[pc->num].bv_val;
 548                         pc->uuids[pc->num].bv_val = NULL;
 549                 }
 550                 ret = LDAP_SUCCESS;
 551                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 552                         break;
 553                 /* FALLTHRU */
 554         case REP_RESULT:
 555                 ret = rs->sr_err;
 556                 if ( pc->num ) {
 557                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 558                                 0, pc->uuids, 0 );
 559                         pc->uuids[pc->num].bv_val = pc->last;
 560                         pc->num = 0;
 561                         pc->last = pc->uuids[0].bv_val;
 562                 }
 563                 break;
 564         default:
 565                 break;
 566         }
 567         return ret;
 568 }
 569
 570 static int
 571 syncprov_findcsn( Operation *op, find_csn_t mode )
 572 {
 573         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 574         syncprov_info_t         *si = on->on_bi.bi_private;
 575
 576         slap_callback cb = {0};
 577         Operation fop;
 578         SlapReply frs = { REP_RESULT };
 579         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 580         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 581         struct berval maxcsn;
 582         Filter cf;
 583         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 584         fpres_cookie pcookie;
 585         sync_control *srs = NULL;
 586         struct slap_limits_set fc_limits;
 587         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 588         int maxid;
 589
 590         if ( mode != FIND_MAXCSN ) {
 591                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 592         }
 593
 594         fop = *op;
 595         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 596         /* We want pure entries, not referrals */
 597         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 598
 599         cf.f_ava = &eq;
 600         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 601         BER_BVZERO( &cf.f_av_value );
 602         cf.f_next = NULL;
 603
 604         fop.o_callback = &cb;
 605         fop.ors_limit = NULL;
 606         fop.ors_tlimit = SLAP_NO_LIMIT;
 607         fop.ors_filter = &cf;
 608         fop.ors_filterstr.bv_val = buf;
 609
 610 again:
 611         switch( mode ) {
 612         case FIND_MAXCSN:
 613                 cf.f_choice = LDAP_FILTER_GE;
 614                 /* If there are multiple CSNs, use the one with our serverID */
 615                 for ( i=0; i<si->si_numcsns; i++) {
 616                         if ( slap_serverID == si->si_sids[i] ) {
 617                                 maxid = i;
 618                                 break;
 619                         }
 620                 }
 621                 if ( i == si->si_numcsns ) {
 622                         /* No match: this is multimaster, and none of the content in the DB
 623                          * originated locally. Treat like no CSN.
 624                          */
 625                         return LDAP_NO_SUCH_OBJECT;
 626                 }
 627                 cf.f_av_value = si->si_ctxcsn[maxid];
 628                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 629                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 630                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 631                         return LDAP_OTHER;
 632                 }
 633                 fop.ors_attrsonly = 0;
 634                 fop.ors_attrs = csn_anlist;
 635                 fop.ors_slimit = SLAP_NO_LIMIT;
 636                 cb.sc_private = &maxcsn;
 637                 cb.sc_response = findmax_cb;
 638                 strcpy( cbuf, cf.f_av_value.bv_val );
 639                 maxcsn.bv_val = cbuf;
 640                 maxcsn.bv_len = cf.f_av_value.bv_len;
 641                 break;
 642         case FIND_CSN:
 643                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 644                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 645                         /* If there are multiple CSNs, use the smallest */
 646                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 647                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 648                                         > 0 ) {
 649                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 650                                 }
 651                         }
 652                 }
 653                 /* Look for exact match the first time */
 654                 if ( findcsn_retry ) {
 655                         cf.f_choice = LDAP_FILTER_EQUALITY;
 656                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 657                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 658                 /* On retry, look for <= */
 659                 } else {
 660                         cf.f_choice = LDAP_FILTER_LE;
 661                         fop.ors_limit = &fc_limits;
 662                         memset( &fc_limits, 0, sizeof( fc_limits ));
 663                         fc_limits.lms_s_unchecked = 1;
 664                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 665                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 666                 }
 667                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 668                         return LDAP_OTHER;
 669                 }
 670                 fop.ors_attrsonly = 1;
 671                 fop.ors_attrs = slap_anlist_no_attrs;
 672                 fop.ors_slimit = 1;
 673                 cb.sc_private = NULL;
 674                 cb.sc_response = findcsn_cb;
 675                 break;
 676         case FIND_PRESENT:
 677                 fop.ors_filter = op->ors_filter;
 678                 fop.ors_filterstr = op->ors_filterstr;
 679                 fop.ors_attrsonly = 0;
 680                 fop.ors_attrs = uuid_anlist;
 681                 fop.ors_slimit = SLAP_NO_LIMIT;
 682                 cb.sc_private = &pcookie;
 683                 cb.sc_response = findpres_cb;
 684                 pcookie.num = 0;
 685
 686                 /* preallocate storage for a full set */
 687                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 688                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 689                         op->o_tmpmemctx );
 690                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 691                 pcookie.uuids[0].bv_val = pcookie.last;
 692                 pcookie.uuids[0].bv_len = UUID_LEN;
 693                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 694                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 695                         pcookie.uuids[i].bv_len = UUID_LEN;
 696                 }
 697                 break;
 698         }
 699
 700         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 701         fop.o_bd->be_search( &fop, &frs );
 702         fop.o_bd->bd_info = (BackendInfo *)on;
 703
 704         switch( mode ) {
 705         case FIND_MAXCSN:
 706                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 707 #ifdef CHECK_CSN
 708                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 709                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 710 #endif
 711                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 712                         si->si_numops++;        /* ensure a checkpoint */
 713                 }
 714                 break;
 715         case FIND_CSN:
 716                 /* If matching CSN was not found, invalidate the context. */
 717                 if ( !cb.sc_private ) {
 718                         /* If we didn't find an exact match, then try for <= */
 719                         if ( findcsn_retry ) {
 720                                 findcsn_retry = 0;
 721                                 goto again;
 722                         }
 723                         rc = LDAP_NO_SUCH_OBJECT;
 724                 }
 725                 break;
 726         case FIND_PRESENT:
 727                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 728                 break;
 729         }
 730
 731         return rc;
 732 }
 733
 734 static void
 735 syncprov_free_syncop( syncops *so )
 736 {
 737         syncres *sr, *srnext;
 738         GroupAssertion *ga, *gnext;
 739
 740         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 741         if ( --so->s_inuse > 0 ) {
 742                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 743                 return;
 744         }
 745         if ( so->s_qtask ) {
 746                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 747                 if ( ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) )
 748                         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 749                 ldap_pvt_runqueue_remove( &slapd_rq, so->s_qtask );
 750                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 751         }
 752         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 753         if ( so->s_flags & PS_IS_DETACHED ) {
 754                 filter_free( so->s_op->ors_filter );
 755                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 756                         gnext = ga->ga_next;
 757                         ch_free( ga );
 758                 }
 759                 ch_free( so->s_op );
 760         }
 761         ch_free( so->s_base.bv_val );
 762         for ( sr=so->s_res; sr; sr=srnext ) {
 763                 srnext = sr->s_next;
 764                 ch_free( sr );
 765         }
 766         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 767         ch_free( so );
 768 }
 769
 770 /* Send a persistent search response */
 771 static int
 772 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 773         Entry **e, int mode )
 774 {
 775         slap_overinst *on = opc->son;
 776
 777         SlapReply rs = { REP_SEARCH };
 778         LDAPControl *ctrls[2];
 779         struct berval cookie, csns[2];
 780         Entry e_uuid = {0};
 781         Attribute a_uuid = {0};
 782
 783         if ( so->s_op->o_abandon )
 784                 return SLAPD_ABANDON;
 785
 786         ctrls[1] = NULL;
 787         csns[0] = opc->sctxcsn;
 788         BER_BVZERO( &csns[1] );
 789         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 790
 791         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 792
 793         e_uuid.e_attrs = &a_uuid;
 794         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 795         a_uuid.a_nvals = &opc->suuid;
 796         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 797                 mode, ctrls, 0, 1, &cookie );
 798         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 799
 800         rs.sr_ctrls = ctrls;
 801         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 802         switch( mode ) {
 803         case LDAP_SYNC_ADD:
 804                 rs.sr_entry = *e;
 805                 if ( rs.sr_entry->e_private )
 806                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 807                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 808                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 809                         rs.sr_err = send_search_reference( op, &rs );
 810                         ber_bvarray_free( rs.sr_ref );
 811                         if ( !rs.sr_entry )
 812                                 *e = NULL;
 813                         break;
 814                 }
 815                 /* fallthru */
 816         case LDAP_SYNC_MODIFY:
 817                 rs.sr_entry = *e;
 818                 if ( rs.sr_entry->e_private )
 819                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 820                 rs.sr_attrs = op->ors_attrs;
 821                 rs.sr_err = send_search_entry( op, &rs );
 822                 if ( !rs.sr_entry )
 823                         *e = NULL;
 824                 break;
 825         case LDAP_SYNC_DELETE:
 826                 e_uuid.e_attrs = NULL;
 827                 e_uuid.e_name = opc->sdn;
 828                 e_uuid.e_nname = opc->sndn;
 829                 rs.sr_entry = &e_uuid;
 830                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 831                         struct berval bv = BER_BVNULL;
 832                         rs.sr_ref = &bv;
 833                         rs.sr_err = send_search_reference( op, &rs );
 834                 } else {
 835                         rs.sr_err = send_search_entry( op, &rs );
 836                 }
 837                 break;
 838         default:
 839                 assert(0);
 840         }
 841         /* In case someone else freed it already? */
 842         if ( rs.sr_ctrls ) {
 843                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 844                 rs.sr_ctrls = NULL;
 845         }
 846
 847         return rs.sr_err;
 848 }
 849
 850 /* Play back queued responses */
 851 static int
 852 syncprov_qplay( Operation *op, struct re_s *rtask )
 853 {
 854         syncops *so = rtask->arg;
 855         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 856         syncres *sr;
 857         Entry *e;
 858         opcookie opc;
 859         int rc = 0;
 860
 861         opc.son = on;
 862
 863         for (;;) {
 864                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 865                 sr = so->s_res;
 866                 if ( sr )
 867                         so->s_res = sr->s_next;
 868                 if ( !so->s_res )
 869                         so->s_restail = NULL;
 870                 /* Exit loop with mutex held */
 871                 if ( !sr || so->s_op->o_abandon )
 872                         break;
 873                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 874
 875                 opc.sdn = sr->s_dn;
 876                 opc.sndn = sr->s_ndn;
 877                 opc.suuid = sr->s_uuid;
 878                 opc.sctxcsn = sr->s_csn;
 879                 opc.sreference = sr->s_isreference;
 880                 e = NULL;
 881
 882                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 883                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 884                         if ( rc ) {
 885                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 886                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 887                                 ch_free( sr );
 888                                 rc = 0;
 889                                 continue;
 890                         }
 891                 }
 892                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 893
 894                 if ( e ) {
 895                         overlay_entry_release_ov( op, e, 0, on );
 896                 }
 897
 898                 ch_free( sr );
 899
 900                 if ( rc ) {
 901                         /* Exit loop with mutex held */
 902                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 903                         break;
 904                 }
 905         }
 906
 907         /* wait until we get explicitly scheduled again */
 908         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 909         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 910         if ( rc == 0 ) {
 911                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 912         } else {
 913                 /* bail out on any error */
 914                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 915
 916                 /* Prevent duplicate remove */
 917                 if ( so->s_qtask == rtask )
 918                         so->s_qtask = NULL;
 919         }
 920         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 921         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 922         return rc;
 923 }
 924
 925 /* runqueue task for playing back queued responses */
 926 static void *
 927 syncprov_qtask( void *ctx, void *arg )
 928 {
 929         struct re_s *rtask = arg;
 930         syncops *so = rtask->arg;
 931         OperationBuffer opbuf;
 932         Operation *op;
 933         BackendDB be;
 934         int rc;
 935
 936         op = &opbuf.ob_op;
 937         *op = *so->s_op;
 938         op->o_hdr = &opbuf.ob_hdr;
 939         op->o_controls = opbuf.ob_controls;
 940         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 941
 942         *op->o_hdr = *so->s_op->o_hdr;
 943
 944         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 945         op->o_tmpmfuncs = &slap_sl_mfuncs;
 946         op->o_threadctx = ctx;
 947
 948         /* syncprov_qplay expects a fake db */
 949         be = *so->s_op->o_bd;
 950         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 951         op->o_bd = &be;
 952         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 953         op->o_callback = NULL;
 954
 955         rc = syncprov_qplay( op, rtask );
 956
 957         /* decrement use count... */
 958         syncprov_free_syncop( so );
 959
 960 #if 0   /* FIXME: connection_close isn't exported from slapd.
 961                  * should it be?
 962                  */
 963         if ( rc ) {
 964                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 965                 if ( connection_state_closing( op->o_conn )) {
 966                         connection_close( op->o_conn );
 967                 }
 968                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 969         }
 970 #endif
 971         return NULL;
 972 }
 973
 974 /* Start the task to play back queued psearch responses */
 975 static void
 976 syncprov_qstart( syncops *so )
 977 {
 978         int wake=0;
 979         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 980         if ( !so->s_qtask ) {
 981                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 982                         syncprov_qtask, so, "syncprov_qtask",
 983                         so->s_op->o_conn->c_peer_name.bv_val );
 984                 ++so->s_inuse;
 985                 wake = 1;
 986         } else {
 987                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 988                         !so->s_qtask->next_sched.tv_sec ) {
 989                         so->s_qtask->interval.tv_sec = 0;
 990                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 991                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 992                         ++so->s_inuse;
 993                         wake = 1;
 994                 }
 995         }
 996         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 997         if ( wake )
 998                 slap_wake_listener();
 999 }
1000
1001 /* Queue a persistent search response */
1002 static int
1003 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1004 {
1005         syncres *sr;
1006         int sid, srsize;
1007
1008         /* Don't send changes back to their originator */
1009         sid = slap_parse_csn_sid( &opc->sctxcsn );
1010         if ( sid >= 0 && sid == so->s_sid )
1011                 return LDAP_SUCCESS;
1012
1013         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1014                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1015         if ( opc->sctxcsn.bv_len )
1016                 srsize += opc->sctxcsn.bv_len + 1;
1017         sr = ch_malloc( srsize );
1018         sr->s_next = NULL;
1019         sr->s_dn.bv_val = (char *)(sr + 1);
1020         sr->s_dn.bv_len = opc->sdn.bv_len;
1021         sr->s_mode = mode;
1022         sr->s_isreference = opc->sreference;
1023         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1024                  opc->sdn.bv_val ) + 1;
1025         sr->s_ndn.bv_len = opc->sndn.bv_len;
1026         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1027                  opc->sndn.bv_val ) + 1;
1028         sr->s_uuid.bv_len = opc->suuid.bv_len;
1029         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1030         if ( opc->sctxcsn.bv_len ) {
1031                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1032                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1033         } else {
1034                 sr->s_csn.bv_val = NULL;
1035         }
1036         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1037
1038         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1039         if ( !so->s_res ) {
1040                 so->s_res = sr;
1041         } else {
1042                 so->s_restail->s_next = sr;
1043         }
1044         so->s_restail = sr;
1045
1046         /* If the base of the psearch was modified, check it next time round */
1047         if ( so->s_flags & PS_WROTE_BASE ) {
1048                 so->s_flags ^= PS_WROTE_BASE;
1049                 so->s_flags |= PS_FIND_BASE;
1050         }
1051         if ( so->s_flags & PS_IS_DETACHED ) {
1052                 syncprov_qstart( so );
1053         }
1054         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1055         return LDAP_SUCCESS;
1056 }
1057
1058 static int
1059 syncprov_drop_psearch( syncops *so, int lock )
1060 {
1061         if ( so->s_flags & PS_IS_DETACHED ) {
1062                 if ( lock )
1063                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1064                 so->s_op->o_conn->c_n_ops_executing--;
1065                 so->s_op->o_conn->c_n_ops_completed++;
1066                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1067                         o_next );
1068                 if ( lock )
1069                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1070         }
1071         syncprov_free_syncop( so );
1072
1073         return 0;
1074 }
1075
1076 static int
1077 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1078 {
1079         slap_callback *sc = op->o_callback;
1080         op->o_callback = sc->sc_next;
1081         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1082         op->o_tmpfree( sc, op->o_tmpmemctx );
1083         return 0;
1084 }
1085
1086 static int
1087 syncprov_op_abandon( Operation *op, SlapReply *rs )
1088 {
1089         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1090         syncprov_info_t         *si = on->on_bi.bi_private;
1091         syncops *so, *soprev;
1092
1093         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1094         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1095                 soprev=so, so=so->s_next ) {
1096                 if ( so->s_op->o_connid == op->o_connid &&
1097                         so->s_op->o_msgid == op->orn_msgid ) {
1098                                 so->s_op->o_abandon = 1;
1099                                 soprev->s_next = so->s_next;
1100                                 break;
1101                 }
1102         }
1103         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1104         if ( so ) {
1105                 /* Is this really a Cancel exop? */
1106                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1107                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1108                         rs->sr_err = LDAP_CANCELLED;
1109                         send_ldap_result( so->s_op, rs );
1110                         if ( so->s_flags & PS_IS_DETACHED ) {
1111                                 slap_callback *cb;
1112                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1113                                 cb->sc_cleanup = syncprov_ab_cleanup;
1114                                 cb->sc_next = op->o_callback;
1115                                 cb->sc_private = so;
1116                                 return SLAP_CB_CONTINUE;
1117                         }
1118                 }
1119                 syncprov_drop_psearch( so, 0 );
1120         }
1121         return SLAP_CB_CONTINUE;
1122 }
1123
1124 /* Find which persistent searches are affected by this operation */
1125 static void
1126 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1127 {
1128         slap_overinst *on = opc->son;
1129         syncprov_info_t         *si = on->on_bi.bi_private;
1130
1131         fbase_cookie fc;
1132         syncops *ss, *sprev, *snext;
1133         Entry *e = NULL;
1134         Attribute *a;
1135         int rc;
1136         struct berval newdn;
1137         int freefdn = 0;
1138         BackendDB *b0 = op->o_bd, db;
1139
1140         fc.fdn = &op->o_req_ndn;
1141         /* compute new DN */
1142         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1143                 struct berval pdn;
1144                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1145                 else dnParent( fc.fdn, &pdn );
1146                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1147                 fc.fdn = &newdn;
1148                 freefdn = 1;
1149         }
1150         if ( op->o_tag != LDAP_REQ_ADD ) {
1151                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1152                         db = *op->o_bd;
1153                         op->o_bd = &db;
1154                 }
1155                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1156                 /* If we're sending responses now, make a copy and unlock the DB */
1157                 if ( e && !saveit ) {
1158                         Entry *e2 = entry_dup( e );
1159                         overlay_entry_release_ov( op, e, 0, on );
1160                         e = e2;
1161                 }
1162                 if ( rc ) {
1163                         op->o_bd = b0;
1164                         return;
1165                 }
1166         } else {
1167                 e = op->ora_e;
1168         }
1169
1170         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1171                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1172                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1173                 opc->sreference = is_entry_referral( e );
1174                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1175                 if ( a )
1176                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1177         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1178                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1179                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1180                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1181                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1182         }
1183
1184         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1185         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1186                 sprev = ss, ss=snext)
1187         {
1188                 Operation op2;
1189                 Opheader oh;
1190                 syncmatches *sm;
1191                 int found = 0;
1192
1193                 snext = ss->s_next;
1194                 if ( ss->s_op->o_abandon )
1195                         continue;
1196
1197                 /* validate base */
1198                 fc.fss = ss;
1199                 fc.fbase = 0;
1200                 fc.fscope = 0;
1201
1202                 /* If the base of the search is missing, signal a refresh */
1203                 rc = syncprov_findbase( op, &fc );
1204                 if ( rc != LDAP_SUCCESS ) {
1205                         SlapReply rs = {REP_RESULT};
1206                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1207                                 "search base has changed" );
1208                         sprev->s_next = snext;
1209                         syncprov_drop_psearch( ss, 1 );
1210                         ss = sprev;
1211                         continue;
1212                 }
1213
1214
1215                 /* If we're sending results now, look for this op in old matches */
1216                 if ( !saveit ) {
1217                         syncmatches *old;
1218
1219                         /* Did we modify the search base? */
1220                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1221                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1222                                 ss->s_flags |= PS_WROTE_BASE;
1223                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1224                         }
1225
1226                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1227                                 old=sm, sm=sm->sm_next ) {
1228                                 if ( sm->sm_op == ss ) {
1229                                         found = 1;
1230                                         old->sm_next = sm->sm_next;
1231                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1232                                         break;
1233                                 }
1234                         }
1235                 }
1236
1237                 if ( fc.fscope ) {
1238                         op2 = *ss->s_op;
1239                         oh = *op->o_hdr;
1240                         oh.oh_conn = ss->s_op->o_conn;
1241                         oh.oh_connid = ss->s_op->o_connid;
1242                         op2.o_hdr = &oh;
1243                         op2.o_extra = op->o_extra;
1244                 }
1245
1246                 /* check if current o_req_dn is in scope and matches filter */
1247                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1248                         LDAP_COMPARE_TRUE ) {
1249                         if ( saveit ) {
1250                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1251                                 sm->sm_next = opc->smatches;
1252                                 sm->sm_op = ss;
1253                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1254                                 ++ss->s_inuse;
1255                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1256                                 opc->smatches = sm;
1257                         } else {
1258                                 /* if found send UPDATE else send ADD */
1259                                 syncprov_qresp( opc, ss,
1260                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1261                         }
1262                 } else if ( !saveit && found ) {
1263                         /* send DELETE */
1264                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1265                 }
1266                 if ( !saveit && found ) {
1267                         /* Decrement s_inuse, was incremented when called
1268                          * with saveit == TRUE
1269                          */
1270                         syncprov_free_syncop( ss );
1271                 }
1272         }
1273         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1274
1275         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1276                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1277                         op->o_bd = &db;
1278                 }
1279                 overlay_entry_release_ov( op, e, 0, on );
1280                 op->o_bd = b0;
1281         }
1282         if ( freefdn ) {
1283                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1284         }
1285         op->o_bd = b0;
1286 }
1287
1288 static int
1289 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1290 {
1291         slap_callback *cb = op->o_callback;
1292         opcookie *opc = cb->sc_private;
1293         slap_overinst *on = opc->son;
1294         syncprov_info_t         *si = on->on_bi.bi_private;
1295         syncmatches *sm, *snext;
1296         modtarget *mt, mtdummy;
1297
1298         for (sm = opc->smatches; sm; sm=snext) {
1299                 snext = sm->sm_next;
1300                 syncprov_free_syncop( sm->sm_op );
1301                 op->o_tmpfree( sm, op->o_tmpmemctx );
1302         }
1303
1304         /* Remove op from lock table */
1305         mtdummy.mt_op = op;
1306         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1307         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1308         if ( mt ) {
1309                 modinst *mi = mt->mt_mods;
1310
1311                 /* If there are more, promote the next one */
1312                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1313                 if ( mi->mi_next ) {
1314                         mt->mt_mods = mi->mi_next;
1315                         mt->mt_op = mt->mt_mods->mi_op;
1316                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1317                 } else {
1318                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1319                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1320                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1321                         ch_free( mt );
1322                 }
1323         }
1324         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1325         if ( !BER_BVISNULL( &opc->suuid ))
1326                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1327         if ( !BER_BVISNULL( &opc->sndn ))
1328                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1329         if ( !BER_BVISNULL( &opc->sdn ))
1330                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1331         op->o_callback = cb->sc_next;
1332         op->o_tmpfree(cb, op->o_tmpmemctx);
1333
1334         return 0;
1335 }
1336
1337 static void
1338 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1339 {
1340         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1341         Modifications mod;
1342         Operation opm;
1343         SlapReply rsm = { 0 };
1344         slap_callback cb = {0};
1345         BackendDB be;
1346 #ifdef CHECK_CSN
1347         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1348
1349         int i;
1350         for ( i=0; i<si->si_numcsns; i++ ) {
1351                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1352         }
1353 #endif
1354         mod.sml_numvals = si->si_numcsns;
1355         mod.sml_values = si->si_ctxcsn;
1356         mod.sml_nvalues = NULL;
1357         mod.sml_desc = slap_schema.si_ad_contextCSN;
1358         mod.sml_op = LDAP_MOD_REPLACE;
1359         mod.sml_flags = SLAP_MOD_INTERNAL;
1360         mod.sml_next = NULL;
1361
1362         cb.sc_response = slap_null_cb;
1363         opm = *op;
1364         opm.o_tag = LDAP_REQ_MODIFY;
1365         opm.o_callback = &cb;
1366         opm.orm_modlist = &mod;
1367         opm.orm_no_opattrs = 1;
1368         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1369                 be = *on->on_info->oi_origdb;
1370                 opm.o_bd = &be;
1371         }
1372         opm.o_req_dn = opm.o_bd->be_suffix[0];
1373         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1374         opm.o_bd->bd_info = on->on_info->oi_orig;
1375         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1376         opm.o_no_schema_check = 1;
1377         opm.o_bd->be_modify( &opm, &rsm );
1378         if ( mod.sml_next != NULL ) {
1379                 slap_mods_free( mod.sml_next, 1 );
1380         }
1381 #ifdef CHECK_CSN
1382         for ( i=0; i<si->si_numcsns; i++ ) {
1383                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1384         }
1385 #endif
1386 }
1387
1388 static void
1389 syncprov_add_slog( Operation *op )
1390 {
1391         opcookie *opc = op->o_callback->sc_private;
1392         slap_overinst *on = opc->son;
1393         syncprov_info_t         *si = on->on_bi.bi_private;
1394         sessionlog *sl;
1395         slog_entry *se;
1396
1397         sl = si->si_logs;
1398         {
1399                 /* Allocate a record. UUIDs are not NUL-terminated. */
1400                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1401                         op->o_csn.bv_len + 1 );
1402                 se->se_next = NULL;
1403                 se->se_tag = op->o_tag;
1404
1405                 se->se_uuid.bv_val = (char *)(&se[1]);
1406                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1407                 se->se_uuid.bv_len = opc->suuid.bv_len;
1408
1409                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1410                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1411                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1412                 se->se_csn.bv_len = op->o_csn.bv_len;
1413                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1414
1415                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1416                 if ( sl->sl_head ) {
1417                         sl->sl_tail->se_next = se;
1418                 } else {
1419                         sl->sl_head = se;
1420                 }
1421                 sl->sl_tail = se;
1422                 sl->sl_num++;
1423                 while ( sl->sl_num > sl->sl_size ) {
1424                         se = sl->sl_head;
1425                         sl->sl_head = se->se_next;
1426                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1427                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1428                         ch_free( se );
1429                         sl->sl_num--;
1430                 }
1431                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1432         }
1433 }
1434
1435 /* Just set a flag if we found the matching entry */
1436 static int
1437 playlog_cb( Operation *op, SlapReply *rs )
1438 {
1439         if ( rs->sr_type == REP_SEARCH ) {
1440                 op->o_callback->sc_private = (void *)1;
1441         }
1442         return rs->sr_err;
1443 }
1444
1445 /* enter with sl->sl_mutex locked, release before returning */
1446 static void
1447 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1448         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1449 {
1450         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1451         slog_entry *se;
1452         int i, j, ndel, num, nmods, mmods;
1453         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1454         BerVarray uuids;
1455         struct berval delcsn[2];
1456
1457         if ( !sl->sl_num ) {
1458                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1459                 return;
1460         }
1461
1462         num = sl->sl_num;
1463         i = 0;
1464         nmods = 0;
1465
1466         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1467                 num * UUID_LEN, op->o_tmpmemctx );
1468         uuids[0].bv_val = (char *)(uuids + num + 1);
1469
1470         delcsn[0].bv_len = 0;
1471         delcsn[0].bv_val = cbuf;
1472         BER_BVZERO(&delcsn[1]);
1473
1474         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1475          * and everything else at the end. Do this first so we can
1476          * unlock the list mutex.
1477          */
1478         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1479                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1480         for ( se=sl->sl_head; se; se=se->se_next ) {
1481                 int k;
1482                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1483                 ndel = 1;
1484                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1485                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1486                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1487                                 break;
1488                         }
1489                 }
1490                 if ( ndel <= 0 ) {
1491                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1492                         continue;
1493                 }
1494                 ndel = 0;
1495                 for ( k=0; k<numcsns; k++ ) {
1496                         if ( se->se_sid == sids[k] ) {
1497                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1498                                 break;
1499                         }
1500                 }
1501                 if ( ndel > 0 ) {
1502                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1503                         break;
1504                 }
1505                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1506                         j = i;
1507                         i++;
1508                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1509                         delcsn[0].bv_len = se->se_csn.bv_len;
1510                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1511                 } else {
1512                         nmods++;
1513                         j = num - nmods;
1514                 }
1515                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1516                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1517                 uuids[j].bv_len = UUID_LEN;
1518         }
1519         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1520
1521         ndel = i;
1522
1523         /* Zero out unused slots */
1524         for ( i=ndel; i < num - nmods; i++ )
1525                 uuids[i].bv_len = 0;
1526
1527         /* Mods must be validated to see if they belong in this delete set.
1528          */
1529
1530         mmods = nmods;
1531         /* Strip any duplicates */
1532         for ( i=0; i<nmods; i++ ) {
1533                 for ( j=0; j<ndel; j++ ) {
1534                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1535                                 uuids[num - 1 - i].bv_len = 0;
1536                                 mmods --;
1537                                 break;
1538                         }
1539                 }
1540                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1541                 for ( j=0; j<i; j++ ) {
1542                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1543                                 uuids[num - 1 - i].bv_len = 0;
1544                                 mmods --;
1545                                 break;
1546                         }
1547                 }
1548         }
1549
1550         if ( mmods ) {
1551                 Operation fop;
1552                 SlapReply frs = { REP_RESULT };
1553                 int rc;
1554                 Filter mf, af;
1555                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1556                 slap_callback cb = {0};
1557
1558                 fop = *op;
1559
1560                 fop.o_sync_mode = 0;
1561                 fop.o_callback = &cb;
1562                 fop.ors_limit = NULL;
1563                 fop.ors_tlimit = SLAP_NO_LIMIT;
1564                 fop.ors_attrs = slap_anlist_all_attributes;
1565                 fop.ors_attrsonly = 0;
1566                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1567
1568                 af.f_choice = LDAP_FILTER_AND;
1569                 af.f_next = NULL;
1570                 af.f_and = &mf;
1571                 mf.f_choice = LDAP_FILTER_EQUALITY;
1572                 mf.f_ava = &eq;
1573                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1574                 mf.f_next = fop.ors_filter;
1575
1576                 fop.ors_filter = &af;
1577
1578                 cb.sc_response = playlog_cb;
1579                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1580
1581                 for ( i=ndel; i<num; i++ ) {
1582                         if ( uuids[i].bv_len == 0 ) continue;
1583
1584                         mf.f_av_value = uuids[i];
1585                         cb.sc_private = NULL;
1586                         fop.ors_slimit = 1;
1587                         frs.sr_nentries = 0;
1588                         rc = fop.o_bd->be_search( &fop, &frs );
1589
1590                         /* If entry was not found, add to delete list */
1591                         if ( !cb.sc_private ) {
1592                                 uuids[ndel++] = uuids[i];
1593                         }
1594                 }
1595                 fop.o_bd->bd_info = (BackendInfo *)on;
1596         }
1597         if ( ndel ) {
1598                 struct berval cookie;
1599
1600                 if ( delcsn[0].bv_len ) {
1601                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1602                                 srs->sr_state.sid );
1603
1604                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1605                 }
1606
1607                 uuids[ndel].bv_val = NULL;
1608                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1609                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1610                 if ( delcsn[0].bv_len ) {
1611                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1612                 }
1613         }
1614         op->o_tmpfree( uuids, op->o_tmpmemctx );
1615 }
1616
1617 static int
1618 syncprov_op_response( Operation *op, SlapReply *rs )
1619 {
1620         opcookie *opc = op->o_callback->sc_private;
1621         slap_overinst *on = opc->son;
1622         syncprov_info_t         *si = on->on_bi.bi_private;
1623         syncmatches *sm;
1624
1625         if ( rs->sr_err == LDAP_SUCCESS )
1626         {
1627                 struct berval maxcsn = BER_BVNULL;
1628                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1629                 int do_check = 0, have_psearches, foundit;
1630
1631                 /* Update our context CSN */
1632                 cbuf[0] = '\0';
1633                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1634                 slap_get_commit_csn( op, &maxcsn, &foundit );
1635                 if ( BER_BVISNULL( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1636                         /* syncrepl queues the CSN values in the db where
1637                          * it is configured , not where the changes are made.
1638                          * So look for a value in the glue db if we didn't
1639                          * find any in this db.
1640                          */
1641                         BackendDB *be = op->o_bd;
1642                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1643                         slap_get_commit_csn( op, &maxcsn, &foundit );
1644                         op->o_bd = be;
1645                 }
1646                 if ( !BER_BVISNULL( &maxcsn ) ) {
1647                         int i, sid;
1648 #ifdef CHECK_CSN
1649                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1650                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1651 #endif
1652                         strcpy( cbuf, maxcsn.bv_val );
1653                         sid = slap_parse_csn_sid( &maxcsn );
1654                         for ( i=0; i<si->si_numcsns; i++ ) {
1655                                 if ( sid == si->si_sids[i] ) {
1656                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1657                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1658                                         }
1659                                         break;
1660                                 }
1661                         }
1662                         /* It's a new SID for us */
1663                         if ( i == si->si_numcsns ) {
1664                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1665                                 si->si_numcsns++;
1666                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1667                                         sizeof(int));
1668                                 si->si_sids[i] = sid;
1669                         }
1670                 } else if ( !foundit ) {
1671                         /* internal ops that aren't meant to be replicated */
1672                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1673                         return SLAP_CB_CONTINUE;
1674                 }
1675
1676                 /* Don't do any processing for consumer contextCSN updates */
1677                 if ( op->o_dont_replicate ) {
1678                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1679                         return SLAP_CB_CONTINUE;
1680                 }
1681
1682                 si->si_numops++;
1683                 if ( si->si_chkops || si->si_chktime ) {
1684                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1685                                 do_check = 1;
1686                                 si->si_numops = 0;
1687                         }
1688                         if ( si->si_chktime &&
1689                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1690                                 if ( si->si_chklast ) {
1691                                         do_check = 1;
1692                                         si->si_chklast = op->o_time;
1693                                 } else {
1694                                         si->si_chklast = 1;
1695                                 }
1696                         }
1697                 }
1698                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1699
1700                 if ( do_check ) {
1701                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1702                         syncprov_checkpoint( op, rs, on );
1703                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1704                 }
1705
1706                 /* only update consumer ctx if this is the greatest csn */
1707                 if ( bvmatch( &maxcsn, &op->o_csn )) {
1708                         opc->sctxcsn.bv_len = maxcsn.bv_len;
1709                         opc->sctxcsn.bv_val = cbuf;
1710                 }
1711
1712                 /* Handle any persistent searches */
1713                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1714                 have_psearches = ( si->si_ops != NULL );
1715                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1716                 if ( have_psearches ) {
1717                         switch(op->o_tag) {
1718                         case LDAP_REQ_ADD:
1719                         case LDAP_REQ_MODIFY:
1720                         case LDAP_REQ_MODRDN:
1721                         case LDAP_REQ_EXTENDED:
1722                                 syncprov_matchops( op, opc, 0 );
1723                                 break;
1724                         case LDAP_REQ_DELETE:
1725                                 /* for each match in opc->smatches:
1726                                  *   send DELETE msg
1727                                  */
1728                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1729                                         if ( sm->sm_op->s_op->o_abandon )
1730                                                 continue;
1731                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1732                                 }
1733                                 break;
1734                         }
1735                 }
1736
1737                 /* Add any log records */
1738                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1739                         syncprov_add_slog( op );
1740                 }
1741
1742         }
1743         return SLAP_CB_CONTINUE;
1744 }
1745
1746 /* We don't use a subentry to store the context CSN any more.
1747  * We expose the current context CSN as an operational attribute
1748  * of the suffix entry.
1749  */
1750 static int
1751 syncprov_op_compare( Operation *op, SlapReply *rs )
1752 {
1753         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1754         syncprov_info_t         *si = on->on_bi.bi_private;
1755         int rc = SLAP_CB_CONTINUE;
1756
1757         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1758                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1759         {
1760                 Entry e = {0};
1761                 Attribute a = {0};
1762
1763                 e.e_name = op->o_bd->be_suffix[0];
1764                 e.e_nname = op->o_bd->be_nsuffix[0];
1765                 e.e_attrs = &a;
1766
1767                 a.a_desc = slap_schema.si_ad_contextCSN;
1768
1769                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1770
1771                 a.a_vals = si->si_ctxcsn;
1772                 a.a_nvals = a.a_vals;
1773                 a.a_numvals = si->si_numcsns;
1774
1775                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1776                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1777                 if ( ! rs->sr_err ) {
1778                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1779                         goto return_results;
1780                 }
1781
1782                 if ( get_assert( op ) &&
1783                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1784                 {
1785                         rs->sr_err = LDAP_ASSERTION_FAILED;
1786                         goto return_results;
1787                 }
1788
1789
1790                 rs->sr_err = LDAP_COMPARE_FALSE;
1791
1792                 if ( attr_valfind( &a,
1793                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1794                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1795                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1796                 {
1797                         rs->sr_err = LDAP_COMPARE_TRUE;
1798                 }
1799
1800 return_results:;
1801
1802                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1803
1804                 send_ldap_result( op, rs );
1805
1806                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1807                         rs->sr_err = LDAP_SUCCESS;
1808                 }
1809                 rc = rs->sr_err;
1810         }
1811
1812         return rc;
1813 }
1814
1815 static int
1816 syncprov_op_mod( Operation *op, SlapReply *rs )
1817 {
1818         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1819         syncprov_info_t         *si = on->on_bi.bi_private;
1820         slap_callback *cb;
1821         opcookie *opc;
1822         int have_psearches, cbsize;
1823
1824         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1825         have_psearches = ( si->si_ops != NULL );
1826         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1827
1828         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1829                 (have_psearches ? sizeof(modinst) : 0 );
1830
1831         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1832         opc = (opcookie *)(cb+1);
1833         opc->son = on;
1834         cb->sc_response = syncprov_op_response;
1835         cb->sc_cleanup = syncprov_op_cleanup;
1836         cb->sc_private = opc;
1837         cb->sc_next = op->o_callback;
1838         op->o_callback = cb;
1839
1840         /* If there are active persistent searches, lock this operation.
1841          * See seqmod.c for the locking logic on its own.
1842          */
1843         if ( have_psearches ) {
1844                 modtarget *mt, mtdummy;
1845                 modinst *mi;
1846
1847                 mi = (modinst *)(opc+1);
1848                 mi->mi_op = op;
1849
1850                 /* See if we're already modifying this entry... */
1851                 mtdummy.mt_op = op;
1852                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1853                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1854                 if ( mt ) {
1855                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1856                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1857                         mt->mt_tail->mi_next = mi;
1858                         mt->mt_tail = mi;
1859                         /* wait for this op to get to head of list */
1860                         while ( mt->mt_mods != mi ) {
1861                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1862                                 /* FIXME: if dynamic config can delete overlays or
1863                                  * databases we'll have to check for cleanup here.
1864                                  * Currently it's not an issue because there are
1865                                  * no dynamic config deletes...
1866                                  */
1867                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1868                                         ldap_pvt_thread_yield();
1869                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1870
1871                                 /* clean up if the caller is giving up */
1872                                 if ( op->o_abandon ) {
1873                                         modinst *m2;
1874                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1875                                                 m2 = m2->mi_next );
1876                                         m2->mi_next = mi->mi_next;
1877                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1878                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1879                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1880                                         return SLAPD_ABANDON;
1881                                 }
1882                         }
1883                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1884                 } else {
1885                         /* Record that we're modifying this entry now */
1886                         mt = ch_malloc( sizeof(modtarget) );
1887                         mt->mt_mods = mi;
1888                         mt->mt_tail = mi;
1889                         mt->mt_op = mi->mi_op;
1890                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1891                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1892                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1893                 }
1894         }
1895
1896         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1897                 syncprov_matchops( op, opc, 1 );
1898
1899         return SLAP_CB_CONTINUE;
1900 }
1901
1902 static int
1903 syncprov_op_extended( Operation *op, SlapReply *rs )
1904 {
1905         if ( exop_is_write( op ))
1906                 return syncprov_op_mod( op, rs );
1907
1908         return SLAP_CB_CONTINUE;
1909 }
1910
1911 typedef struct searchstate {
1912         slap_overinst *ss_on;
1913         syncops *ss_so;
1914         BerVarray ss_ctxcsn;
1915         int *ss_sids;
1916         int ss_numcsns;
1917 #define SS_PRESENT      0x01
1918 #define SS_CHANGED      0x02
1919         int ss_flags;
1920 } searchstate;
1921
1922 static int
1923 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1924 {
1925         if ( rs->sr_ctrls ) {
1926                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1927                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1928                 rs->sr_ctrls = NULL;
1929         }
1930         return 0;
1931 }
1932
1933 typedef struct SyncOperationBuffer {
1934         Operation               sob_op;
1935         Opheader                sob_hdr;
1936         OpExtra                 sob_oe;
1937         AttributeName   sob_extra;      /* not always present */
1938         /* Further data allocated here */
1939 } SyncOperationBuffer;
1940
1941 static void
1942 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1943 {
1944         SyncOperationBuffer *sopbuf2;
1945         Operation *op2;
1946         int i, alen = 0;
1947         size_t size;
1948         char *ptr;
1949         GroupAssertion *g1, *g2;
1950
1951         /* count the search attrs */
1952         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1953                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1954         }
1955         /* Make a new copy of the operation */
1956         size = offsetof( SyncOperationBuffer, sob_extra ) +
1957                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1958                 op->o_req_dn.bv_len + 1 +
1959                 op->o_req_ndn.bv_len + 1 +
1960                 op->o_ndn.bv_len + 1 +
1961                 so->s_filterstr.bv_len + 1;
1962         sopbuf2 = ch_calloc( 1, size );
1963         op2 = &sopbuf2->sob_op;
1964         op2->o_hdr = &sopbuf2->sob_hdr;
1965         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1966
1967         /* Copy the fields we care about explicitly, leave the rest alone */
1968         *op2->o_hdr = *op->o_hdr;
1969         op2->o_tag = op->o_tag;
1970         op2->o_time = op->o_time;
1971         op2->o_bd = on->on_info->oi_origdb;
1972         op2->o_request = op->o_request;
1973         op2->o_managedsait = op->o_managedsait;
1974         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
1975         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
1976
1977         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1978         if ( i ) {
1979                 op2->ors_attrs = (AttributeName *) ptr;
1980                 ptr = (char *) &op2->ors_attrs[i+1];
1981                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1982                         op2->ors_attrs[i] = op->ors_attrs[i];
1983                         op2->ors_attrs[i].an_name.bv_val = ptr;
1984                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1985                 }
1986                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1987         }
1988
1989         op2->o_authz = op->o_authz;
1990         op2->o_ndn.bv_val = ptr;
1991         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1992         op2->o_dn = op2->o_ndn;
1993         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1994         op2->o_req_dn.bv_val = ptr;
1995         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1996         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1997         op2->o_req_ndn.bv_val = ptr;
1998         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1999         op2->ors_filterstr.bv_val = ptr;
2000         strcpy( ptr, so->s_filterstr.bv_val );
2001         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2002
2003         /* Skip the AND/GE clause that we stuck on in front */
2004         if ( so->s_flags & PS_FIX_FILTER ) {
2005                 op2->ors_filter = op->ors_filter->f_and->f_next;
2006                 so->s_flags ^= PS_FIX_FILTER;
2007         } else {
2008                 op2->ors_filter = op->ors_filter;
2009         }
2010         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2011         so->s_op = op2;
2012
2013         /* Copy any cached group ACLs individually */
2014         op2->o_groups = NULL;
2015         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2016                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2017                 *g2 = *g1;
2018                 strcpy( g2->ga_ndn, g1->ga_ndn );
2019                 g2->ga_next = op2->o_groups;
2020                 op2->o_groups = g2;
2021         }
2022         /* Don't allow any further group caching */
2023         op2->o_do_not_cache = 1;
2024
2025         /* Add op2 to conn so abandon will find us */
2026         op->o_conn->c_n_ops_executing++;
2027         op->o_conn->c_n_ops_completed--;
2028         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2029         so->s_flags |= PS_IS_DETACHED;
2030
2031         /* Prevent anyone else from trying to send a result for this op */
2032         op->o_abandon = 1;
2033 }
2034
2035 static int
2036 syncprov_search_response( Operation *op, SlapReply *rs )
2037 {
2038         searchstate *ss = op->o_callback->sc_private;
2039         slap_overinst *on = ss->ss_on;
2040         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2041         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2042
2043         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2044                 Attribute *a;
2045                 /* If we got a referral without a referral object, there's
2046                  * something missing that we cannot replicate. Just ignore it.
2047                  * The consumer will abort because we didn't send the expected
2048                  * control.
2049                  */
2050                 if ( !rs->sr_entry ) {
2051                         assert( rs->sr_entry != NULL );
2052                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2053                         return SLAP_CB_CONTINUE;
2054                 }
2055                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2056                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2057                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2058                 }
2059                 if ( a ) {
2060                         int i, sid;
2061                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2062
2063                         /* Don't send changed entries back to the originator */
2064                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2065                                 Debug( LDAP_DEBUG_SYNC,
2066                                         "Entry %s changed by peer, ignored\n",
2067                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2068                                 return LDAP_SUCCESS;
2069                         }
2070
2071                         /* If not a persistent search */
2072                         if ( !ss->ss_so ) {
2073                                 /* Make sure entry is less than the snapshot'd contextCSN */
2074                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2075                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2076                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2077                                                 Debug( LDAP_DEBUG_SYNC,
2078                                                         "Entry %s CSN %s greater than snapshot %s\n",
2079                                                         rs->sr_entry->e_name.bv_val,
2080                                                         a->a_nvals[0].bv_val,
2081                                                         ss->ss_ctxcsn[i].bv_val );
2082                                                 return LDAP_SUCCESS;
2083                                         }
2084                                 }
2085                         }
2086
2087                         /* Don't send old entries twice */
2088                         if ( srs->sr_state.ctxcsn ) {
2089                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2090                                         if ( sid == srs->sr_state.sids[i] &&
2091                                                 ber_bvcmp( &a->a_nvals[0],
2092                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2093                                                 Debug( LDAP_DEBUG_SYNC,
2094                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2095                                                         rs->sr_entry->e_name.bv_val,
2096                                                         a->a_nvals[0].bv_val,
2097                                                         srs->sr_state.ctxcsn[i].bv_val );
2098                                                 return LDAP_SUCCESS;
2099                                         }
2100                                 }
2101                         }
2102                 }
2103                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2104                         op->o_tmpmemctx );
2105                 rs->sr_ctrls[1] = NULL;
2106                 /* If we're in delta-sync mode, always send a cookie */
2107                 if ( si->si_nopres && si->si_usehint && a ) {
2108                         struct berval cookie;
2109                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2110                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2111                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2112                 } else {
2113                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2114                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2115                 }
2116         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2117                 struct berval cookie;
2118
2119                 if ( ss->ss_flags & SS_CHANGED ) {
2120                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2121                                 srs->sr_state.rid, srs->sr_state.sid );
2122
2123                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2124                 }
2125
2126                 /* Is this a regular refresh?
2127                  * Note: refresh never gets here if there were no changes
2128                  */
2129                 if ( !ss->ss_so ) {
2130                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2131                                 op->o_tmpmemctx );
2132                         rs->sr_ctrls[1] = NULL;
2133                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2134                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2135                                         LDAP_SYNC_REFRESH_DELETES );
2136                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2137                 } else {
2138                 /* It's RefreshAndPersist, transition to Persist phase */
2139                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2140                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2141                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2142                                 1, NULL, 0 );
2143                         if ( ss->ss_flags & SS_CHANGED )
2144                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2145
2146                         /* Detach this Op from frontend control */
2147                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2148
2149                         /* But not if this connection was closed along the way */
2150                         if ( op->o_abandon ) {
2151                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2152                                 /* syncprov_ab_cleanup will free this syncop */
2153                                 return SLAPD_ABANDON;
2154
2155                         } else {
2156                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2157                                 /* Turn off the refreshing flag */
2158                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2159
2160                                 syncprov_detach_op( op, ss->ss_so, on );
2161
2162                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2163
2164                                 /* If there are queued responses, fire them off */
2165                                 if ( ss->ss_so->s_res )
2166                                         syncprov_qstart( ss->ss_so );
2167                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2168                         }
2169
2170                         return LDAP_SUCCESS;
2171                 }
2172         }
2173
2174         return SLAP_CB_CONTINUE;
2175 }
2176
2177 static int
2178 syncprov_op_search( Operation *op, SlapReply *rs )
2179 {
2180         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2181         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2182         slap_callback   *cb;
2183         int gotstate = 0, changed = 0, do_present = 0;
2184         syncops *sop = NULL;
2185         searchstate *ss;
2186         sync_control *srs;
2187         BerVarray ctxcsn;
2188         int i, *sids, numcsns;
2189         struct berval mincsn;
2190
2191         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2192
2193         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2194                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2195                 return rs->sr_err;
2196         }
2197
2198         srs = op->o_controls[slap_cids.sc_LDAPsync];
2199
2200         /* If this is a persistent search, set it up right away */
2201         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2202                 syncops so = {0};
2203                 fbase_cookie fc;
2204                 opcookie opc;
2205                 slap_callback sc;
2206
2207                 fc.fss = &so;
2208                 fc.fbase = 0;
2209                 so.s_eid = NOID;
2210                 so.s_op = op;
2211                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2212                 /* syncprov_findbase expects to be called as a callback... */
2213                 sc.sc_private = &opc;
2214                 opc.son = on;
2215                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2216                 cb = op->o_callback;
2217                 op->o_callback = &sc;
2218                 rs->sr_err = syncprov_findbase( op, &fc );
2219                 op->o_callback = cb;
2220                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2221
2222                 if ( rs->sr_err != LDAP_SUCCESS ) {
2223                         send_ldap_result( op, rs );
2224                         return rs->sr_err;
2225                 }
2226                 sop = ch_malloc( sizeof( syncops ));
2227                 *sop = so;
2228                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2229                 sop->s_rid = srs->sr_state.rid;
2230                 sop->s_sid = srs->sr_state.sid;
2231                 sop->s_inuse = 1;
2232
2233                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2234                 sop->s_next = si->si_ops;
2235                 si->si_ops = sop;
2236                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2237         }
2238
2239         /* snapshot the ctxcsn */
2240         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2241         numcsns = si->si_numcsns;
2242         if ( numcsns ) {
2243                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2244                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2245                 for ( i=0; i<numcsns; i++ )
2246                         sids[i] = si->si_sids[i];
2247         } else {
2248                 ctxcsn = NULL;
2249                 sids = NULL;
2250         }
2251         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2252
2253         /* If we have a cookie, handle the PRESENT lookups */
2254         if ( srs->sr_state.ctxcsn ) {
2255                 sessionlog *sl;
2256                 int i, j;
2257
2258                 /* If we don't have any CSN of our own yet, pretend nothing
2259                  * has changed.
2260                  */
2261                 if ( !numcsns )
2262                         goto no_change;
2263
2264                 if ( !si->si_nopres )
2265                         do_present = SS_PRESENT;
2266
2267                 /* If there are SIDs we don't recognize in the cookie, drop them */
2268                 for (i=0; i<srs->sr_state.numcsns; ) {
2269                         for (j=0; j<numcsns; j++) {
2270                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2271                                         break;
2272                                 }
2273                         }
2274                         /* not found */
2275                         if ( j == numcsns ) {
2276                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2277                                 j = srs->sr_state.numcsns - 1;
2278                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2279                                 tmp.bv_len = 0;
2280                                 srs->sr_state.ctxcsn[j] = tmp;
2281                                 srs->sr_state.numcsns = j;
2282                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2283                                 continue;
2284                         }
2285                         i++;
2286                 }
2287
2288                 /* Find the smallest CSN */
2289                 mincsn = srs->sr_state.ctxcsn[0];
2290                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2291                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2292                                 mincsn = srs->sr_state.ctxcsn[i];
2293                 }
2294
2295                 /* If nothing has changed, shortcut it */
2296                 if ( srs->sr_state.numcsns == numcsns ) {
2297                         int i, j;
2298                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2299                                 for ( j=0; j<numcsns; j++ ) {
2300                                         if ( srs->sr_state.sids[i] != sids[j] )
2301                                                 continue;
2302                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2303                                                 changed = SS_CHANGED;
2304                                         break;
2305                                 }
2306                                 if ( changed )
2307                                         break;
2308                         }
2309                         if ( !changed ) {
2310                                 do_present = 0;
2311 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2312                                         LDAPControl     *ctrls[2];
2313
2314                                         ctrls[0] = NULL;
2315                                         ctrls[1] = NULL;
2316                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2317                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2318                                         rs->sr_ctrls = ctrls;
2319                                         rs->sr_err = LDAP_SUCCESS;
2320                                         send_ldap_result( op, rs );
2321                                         rs->sr_ctrls = NULL;
2322                                         return rs->sr_err;
2323                                 }
2324                                 goto shortcut;
2325                         }
2326                 } else {
2327                         /* consumer doesn't have the right number of CSNs */
2328                         changed = SS_CHANGED;
2329                 }
2330                 /* Do we have a sessionlog for this search? */
2331                 sl=si->si_logs;
2332                 if ( sl ) {
2333                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2334                         /* Are there any log entries, and is the consumer state
2335                          * present in the session log?
2336                          */
2337                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2338                                 do_present = 0;
2339                                 /* mutex is unlocked in playlog */
2340                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2341                         } else {
2342                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2343                         }
2344                 }
2345                 /* Is the CSN still present in the database? */
2346                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2347                         /* No, so a reload is required */
2348                         /* the 2.2 consumer doesn't send this hint */
2349                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2350                                 if ( ctxcsn )
2351                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2352                                 if ( sids )
2353                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2354                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2355                                 return rs->sr_err;
2356                         }
2357                         if ( srs->sr_state.ctxcsn ) {
2358                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2359                                 srs->sr_state.ctxcsn = NULL;
2360                         }
2361                         if ( srs->sr_state.sids ) {
2362                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2363                                 srs->sr_state.sids = NULL;
2364                         }
2365                         srs->sr_state.numcsns = 0;
2366                 } else {
2367                         gotstate = 1;
2368                         /* If changed and doing Present lookup, send Present UUIDs */
2369                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2370                                 LDAP_SUCCESS ) {
2371                                 if ( ctxcsn )
2372                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2373                                 if ( sids )
2374                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2375                                 send_ldap_result( op, rs );
2376                                 return rs->sr_err;
2377                         }
2378                 }
2379         } else {
2380                 /* No consumer state, assume something has changed */
2381                 changed = SS_CHANGED;
2382         }
2383
2384 shortcut:
2385         /* Append CSN range to search filter, save original filter
2386          * for persistent search evaluation
2387          */
2388         if ( sop ) {
2389                 sop->s_filterstr= op->ors_filterstr;
2390         }
2391
2392         /* If something changed, find the changes */
2393         if ( gotstate && changed ) {
2394                 Filter *fand, *fava;
2395
2396                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2397                 fand->f_choice = LDAP_FILTER_AND;
2398                 fand->f_next = NULL;
2399                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2400                 fand->f_and = fava;
2401                 fava->f_choice = LDAP_FILTER_GE;
2402                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2403                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2404 #ifdef LDAP_COMP_MATCH
2405                 fava->f_ava->aa_cf = NULL;
2406 #endif
2407                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2408                 fava->f_next = op->ors_filter;
2409                 op->ors_filter = fand;
2410                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2411                 if ( sop )
2412                         sop->s_flags |= PS_FIX_FILTER;
2413         }
2414
2415         /* Let our callback add needed info to returned entries */
2416         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2417         ss = (searchstate *)(cb+1);
2418         ss->ss_on = on;
2419         ss->ss_so = sop;
2420         ss->ss_flags = do_present | changed;
2421         ss->ss_ctxcsn = ctxcsn;
2422         ss->ss_numcsns = numcsns;
2423         ss->ss_sids = sids;
2424         cb->sc_response = syncprov_search_response;
2425         cb->sc_cleanup = syncprov_search_cleanup;
2426         cb->sc_private = ss;
2427         cb->sc_next = op->o_callback;
2428         op->o_callback = cb;
2429
2430         /* If this is a persistent search and no changes were reported during
2431          * the refresh phase, just invoke the response callback to transition
2432          * us into persist phase
2433          */
2434         if ( !changed ) {
2435                 rs->sr_err = LDAP_SUCCESS;
2436                 rs->sr_nentries = 0;
2437                 send_ldap_result( op, rs );
2438                 return rs->sr_err;
2439         }
2440         return SLAP_CB_CONTINUE;
2441 }
2442
2443 static int
2444 syncprov_operational(
2445         Operation *op,
2446         SlapReply *rs )
2447 {
2448         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2449         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2450
2451         /* This prevents generating unnecessarily; frontend will strip
2452          * any statically stored copy.
2453          */
2454         if ( op->o_sync != SLAP_CONTROL_NONE )
2455                 return SLAP_CB_CONTINUE;
2456
2457         if ( rs->sr_entry &&
2458                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2459
2460                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2461                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2462                         Attribute *a, **ap = NULL;
2463
2464                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2465                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2466                                         break;
2467                         }
2468
2469                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2470                         if ( si->si_ctxcsn ) {
2471                                 if ( !a ) {
2472                                         for ( ap = &rs->sr_operational_attrs; *ap;
2473                                                 ap=&(*ap)->a_next );
2474
2475                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2476                                         *ap = a;
2477                                 }
2478
2479                                 if ( !ap ) {
2480                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2481                                                 Entry *e = entry_dup( rs->sr_entry );
2482                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2483                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2484                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2485                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2486                                                         entry_free( rs->sr_entry );
2487                                                 }
2488                                                 rs->sr_entry = e;
2489                                                 rs->sr_flags |=
2490                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2491                                                 a = attr_find( rs->sr_entry->e_attrs,
2492                                                         slap_schema.si_ad_contextCSN );
2493                                         }
2494                                         if ( a->a_nvals != a->a_vals ) {
2495                                                 ber_bvarray_free( a->a_nvals );
2496                                         }
2497                                         a->a_nvals = NULL;
2498                                         ber_bvarray_free( a->a_vals );
2499                                         a->a_vals = NULL;
2500                                         a->a_numvals = 0;
2501                                 }
2502                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2503                         }
2504                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2505                 }
2506         }
2507         return SLAP_CB_CONTINUE;
2508 }
2509
2510 enum {
2511         SP_CHKPT = 1,
2512         SP_SESSL,
2513         SP_NOPRES,
2514         SP_USEHINT
2515 };
2516
2517 static ConfigDriver sp_cf_gen;
2518
2519 static ConfigTable spcfg[] = {
2520         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2521                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2522                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2523                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2524         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2525                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2526                         "DESC 'Session log size in ops' "
2527                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2528         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2529                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2530                         "DESC 'Omit Present phase processing' "
2531                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2532         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2533                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2534                         "DESC 'Observe Reload Hint in Request control' "
2535                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2536         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2537 };
2538
2539 static ConfigOCs spocs[] = {
2540         { "( OLcfgOvOc:1.1 "
2541                 "NAME 'olcSyncProvConfig' "
2542                 "DESC 'SyncRepl Provider configuration' "
2543                 "SUP olcOverlayConfig "
2544                 "MAY ( olcSpCheckpoint "
2545                         "$ olcSpSessionlog "
2546                         "$ olcSpNoPresent "
2547                         "$ olcSpReloadHint "
2548                 ") )",
2549                         Cft_Overlay, spcfg },
2550         { NULL, 0, NULL }
2551 };
2552
2553 static int
2554 sp_cf_gen(ConfigArgs *c)
2555 {
2556         slap_overinst           *on = (slap_overinst *)c->bi;
2557         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2558         int rc = 0;
2559
2560         if ( c->op == SLAP_CONFIG_EMIT ) {
2561                 switch ( c->type ) {
2562                 case SP_CHKPT:
2563                         if ( si->si_chkops || si->si_chktime ) {
2564                                 struct berval bv;
2565                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2566                                         "%d %d", si->si_chkops, si->si_chktime );
2567                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2568                                         rc = 1;
2569                                 } else {
2570                                         bv.bv_val = c->cr_msg;
2571                                         value_add_one( &c->rvalue_vals, &bv );
2572                                 }
2573                         } else {
2574                                 rc = 1;
2575                         }
2576                         break;
2577                 case SP_SESSL:
2578                         if ( si->si_logs ) {
2579                                 c->value_int = si->si_logs->sl_size;
2580                         } else {
2581                                 rc = 1;
2582                         }
2583                         break;
2584                 case SP_NOPRES:
2585                         if ( si->si_nopres ) {
2586                                 c->value_int = 1;
2587                         } else {
2588                                 rc = 1;
2589                         }
2590                         break;
2591                 case SP_USEHINT:
2592                         if ( si->si_usehint ) {
2593                                 c->value_int = 1;
2594                         } else {
2595                                 rc = 1;
2596                         }
2597                         break;
2598                 }
2599                 return rc;
2600         } else if ( c->op == LDAP_MOD_DELETE ) {
2601                 switch ( c->type ) {
2602                 case SP_CHKPT:
2603                         si->si_chkops = 0;
2604                         si->si_chktime = 0;
2605                         break;
2606                 case SP_SESSL:
2607                         if ( si->si_logs )
2608                                 si->si_logs->sl_size = 0;
2609                         else
2610                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2611                         break;
2612                 case SP_NOPRES:
2613                         if ( si->si_nopres )
2614                                 si->si_nopres = 0;
2615                         else
2616                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2617                         break;
2618                 case SP_USEHINT:
2619                         if ( si->si_usehint )
2620                                 si->si_usehint = 0;
2621                         else
2622                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2623                         break;
2624                 }
2625                 return rc;
2626         }
2627         switch ( c->type ) {
2628         case SP_CHKPT:
2629                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2630                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2631                                 c->argv[0], c->argv[1] );
2632                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2633                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2634                         return ARG_BAD_CONF;
2635                 }
2636                 if ( si->si_chkops <= 0 ) {
2637                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2638                                 c->argv[0], si->si_chkops );
2639                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2640                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2641                         return ARG_BAD_CONF;
2642                 }
2643                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2644                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2645                                 c->argv[0], c->argv[1] );
2646                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2647                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2648                         return ARG_BAD_CONF;
2649                 }
2650                 if ( si->si_chktime <= 0 ) {
2651                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2652                                 c->argv[0], si->si_chkops );
2653                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2654                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2655                         return ARG_BAD_CONF;
2656                 }
2657                 si->si_chktime *= 60;
2658                 break;
2659         case SP_SESSL: {
2660                 sessionlog *sl;
2661                 int size = c->value_int;
2662
2663                 if ( size < 0 ) {
2664                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2665                                 c->argv[0], size );
2666                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2667                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2668                         return ARG_BAD_CONF;
2669                 }
2670                 sl = si->si_logs;
2671                 if ( !sl ) {
2672                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2673                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2674                         sl->sl_mincsn.bv_len = 0;
2675                         sl->sl_num = 0;
2676                         sl->sl_head = sl->sl_tail = NULL;
2677                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2678                         si->si_logs = sl;
2679                 }
2680                 sl->sl_size = size;
2681                 }
2682                 break;
2683         case SP_NOPRES:
2684                 si->si_nopres = c->value_int;
2685                 break;
2686         case SP_USEHINT:
2687                 si->si_usehint = c->value_int;
2688                 break;
2689         }
2690         return rc;
2691 }
2692
2693 /* ITS#3456 we cannot run this search on the main thread, must use a
2694  * child thread in order to insure we have a big enough stack.
2695  */
2696 static void *
2697 syncprov_db_otask(
2698         void *ptr
2699 )
2700 {
2701         syncprov_findcsn( ptr, FIND_MAXCSN );
2702         return NULL;
2703 }
2704
2705 /* Read any existing contextCSN from the underlying db.
2706  * Then search for any entries newer than that. If no value exists,
2707  * just generate it. Cache whatever result.
2708  */
2709 static int
2710 syncprov_db_open(
2711         BackendDB *be,
2712         ConfigReply *cr
2713 )
2714 {
2715         slap_overinst   *on = (slap_overinst *) be->bd_info;
2716         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2717
2718         Connection conn = { 0 };
2719         OperationBuffer opbuf;
2720         Operation *op;
2721         Entry *e = NULL;
2722         Attribute *a;
2723         int rc;
2724         void *thrctx = NULL;
2725
2726         if ( !SLAP_LASTMOD( be )) {
2727                 Debug( LDAP_DEBUG_ANY,
2728                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2729                 return -1;
2730         }
2731
2732         if ( slapMode & SLAP_TOOL_MODE ) {
2733                 return 0;
2734         }
2735
2736         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2737         if ( rc ) {
2738                 return rc;
2739         }
2740
2741         thrctx = ldap_pvt_thread_pool_context();
2742         connection_fake_init( &conn, &opbuf, thrctx );
2743         op = &opbuf.ob_op;
2744         op->o_bd = be;
2745         op->o_dn = be->be_rootdn;
2746         op->o_ndn = be->be_rootndn;
2747
2748         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2749                 slap_schema.si_ad_contextCSN, 0, &e, on );
2750
2751         if ( e ) {
2752                 ldap_pvt_thread_t tid;
2753
2754                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2755                 if ( a ) {
2756                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2757                         si->si_numcsns = a->a_numvals;
2758                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2759                 }
2760                 overlay_entry_release_ov( op, e, 0, on );
2761                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2762                         op->o_req_dn = be->be_suffix[0];
2763                         op->o_req_ndn = be->be_nsuffix[0];
2764                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2765                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2766                         ldap_pvt_thread_join( tid, NULL );
2767                 }
2768         }
2769
2770         /* Didn't find a contextCSN, should we generate one? */
2771         if ( !si->si_ctxcsn ) {
2772                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2773                 struct berval csn;
2774
2775                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2776                 /* If we're also a consumer, then don't generate anything.
2777                  * Wait for our provider to send it to us, or for a local
2778                  * modify if we have multimaster.
2779                  */
2780                         goto out;
2781                 }
2782                 csn.bv_val = csnbuf;
2783                 csn.bv_len = sizeof( csnbuf );
2784                 slap_get_csn( op, &csn, 0 );
2785                 value_add_one( &si->si_ctxcsn, &csn );
2786                 si->si_numcsns = 1;
2787                 si->si_sids = ch_malloc( sizeof(int) );
2788                 si->si_sids[0] = slap_serverID;
2789
2790                 /* make sure we do a checkpoint on close */
2791                 si->si_numops++;
2792         }
2793
2794 out:
2795         op->o_bd->bd_info = (BackendInfo *)on;
2796         return 0;
2797 }
2798
2799 /* Write the current contextCSN into the underlying db.
2800  */
2801 static int
2802 syncprov_db_close(
2803         BackendDB *be,
2804         ConfigReply *cr
2805 )
2806 {
2807     slap_overinst   *on = (slap_overinst *) be->bd_info;
2808     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2809
2810         if ( slapMode & SLAP_TOOL_MODE ) {
2811                 return 0;
2812         }
2813         if ( si->si_numops ) {
2814                 Connection conn = {0};
2815                 OperationBuffer opbuf;
2816                 Operation *op;
2817                 SlapReply rs = {REP_RESULT};
2818                 void *thrctx;
2819
2820                 thrctx = ldap_pvt_thread_pool_context();
2821                 connection_fake_init( &conn, &opbuf, thrctx );
2822                 op = &opbuf.ob_op;
2823                 op->o_bd = be;
2824                 op->o_dn = be->be_rootdn;
2825                 op->o_ndn = be->be_rootndn;
2826                 syncprov_checkpoint( op, &rs, on );
2827         }
2828
2829     return 0;
2830 }
2831
2832 static int
2833 syncprov_db_init(
2834         BackendDB *be,
2835         ConfigReply *cr
2836 )
2837 {
2838         slap_overinst   *on = (slap_overinst *)be->bd_info;
2839         syncprov_info_t *si;
2840
2841         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2842                 Debug( LDAP_DEBUG_ANY,
2843                         "syncprov must be instantiated within a database.\n",
2844                         0, 0, 0 );
2845                 return 1;
2846         }
2847
2848         si = ch_calloc(1, sizeof(syncprov_info_t));
2849         on->on_bi.bi_private = si;
2850         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2851         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2852         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2853
2854         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2855         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2856         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2857         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2858
2859         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2860         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2861
2862         return 0;
2863 }
2864
2865 static int
2866 syncprov_db_destroy(
2867         BackendDB *be,
2868         ConfigReply *cr
2869 )
2870 {
2871         slap_overinst   *on = (slap_overinst *)be->bd_info;
2872         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2873
2874         if ( si ) {
2875                 if ( si->si_logs ) {
2876                         slog_entry *se = si->si_logs->sl_head;
2877
2878                         while ( se ) {
2879                                 slog_entry *se_next = se->se_next;
2880                                 ch_free( se );
2881                                 se = se_next;
2882                         }
2883
2884                         ch_free( si->si_logs );
2885                 }
2886                 if ( si->si_ctxcsn )
2887                         ber_bvarray_free( si->si_ctxcsn );
2888                 if ( si->si_sids )
2889                         ch_free( si->si_sids );
2890                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2891                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2892                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2893                 ch_free( si );
2894         }
2895
2896         return 0;
2897 }
2898
2899 static int syncprov_parseCtrl (
2900         Operation *op,
2901         SlapReply *rs,
2902         LDAPControl *ctrl )
2903 {
2904         ber_tag_t tag;
2905         BerElementBuffer berbuf;
2906         BerElement *ber = (BerElement *)&berbuf;
2907         ber_int_t mode;
2908         ber_len_t len;
2909         struct berval cookie = BER_BVNULL;
2910         sync_control *sr;
2911         int rhint = 0;
2912
2913         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2914                 rs->sr_text = "Sync control specified multiple times";
2915                 return LDAP_PROTOCOL_ERROR;
2916         }
2917
2918         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2919                 rs->sr_text = "Sync control specified with pagedResults control";
2920                 return LDAP_PROTOCOL_ERROR;
2921         }
2922
2923         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2924                 rs->sr_text = "Sync control value is absent";
2925                 return LDAP_PROTOCOL_ERROR;
2926         }
2927
2928         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2929                 rs->sr_text = "Sync control value is empty";
2930                 return LDAP_PROTOCOL_ERROR;
2931         }
2932
2933         /* Parse the control value
2934          *      syncRequestValue ::= SEQUENCE {
2935          *              mode   ENUMERATED {
2936          *                      -- 0 unused
2937          *                      refreshOnly             (1),
2938          *                      -- 2 reserved
2939          *                      refreshAndPersist       (3)
2940          *              },
2941          *              cookie  syncCookie OPTIONAL
2942          *      }
2943          */
2944
2945         ber_init2( ber, &ctrl->ldctl_value, 0 );
2946
2947         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2948                 rs->sr_text = "Sync control : mode decoding error";
2949                 return LDAP_PROTOCOL_ERROR;
2950         }
2951
2952         switch( mode ) {
2953         case LDAP_SYNC_REFRESH_ONLY:
2954                 mode = SLAP_SYNC_REFRESH;
2955                 break;
2956         case LDAP_SYNC_REFRESH_AND_PERSIST:
2957                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2958                 break;
2959         default:
2960                 rs->sr_text = "Sync control : unknown update mode";
2961                 return LDAP_PROTOCOL_ERROR;
2962         }
2963
2964         tag = ber_peek_tag( ber, &len );
2965
2966         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2967                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2968                         rs->sr_text = "Sync control : cookie decoding error";
2969                         return LDAP_PROTOCOL_ERROR;
2970                 }
2971                 tag = ber_peek_tag( ber, &len );
2972         }
2973         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2974                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2975                         rs->sr_text = "Sync control : rhint decoding error";
2976                         return LDAP_PROTOCOL_ERROR;
2977                 }
2978         }
2979         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2980                         rs->sr_text = "Sync control : decoding error";
2981                         return LDAP_PROTOCOL_ERROR;
2982         }
2983         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2984         sr->sr_rhint = rhint;
2985         if (!BER_BVISNULL(&cookie)) {
2986                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2987                 /* If parse fails, pretend no cookie was sent */
2988                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2989                         sr->sr_state.rid == -1 ) {
2990                         if ( sr->sr_state.ctxcsn ) {
2991                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2992                                 sr->sr_state.ctxcsn = NULL;
2993                         }
2994                         sr->sr_state.numcsns = 0;
2995                 }
2996         }
2997
2998         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2999
3000         op->o_sync = ctrl->ldctl_iscritical
3001                 ? SLAP_CONTROL_CRITICAL
3002                 : SLAP_CONTROL_NONCRITICAL;
3003
3004         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3005
3006         return LDAP_SUCCESS;
3007 }
3008
3009 /* This overlay is set up for dynamic loading via moduleload. For static
3010  * configuration, you'll need to arrange for the slap_overinst to be
3011  * initialized and registered by some other function inside slapd.
3012  */
3013
3014 static slap_overinst            syncprov;
3015
3016 int
3017 syncprov_initialize()
3018 {
3019         int rc;
3020
3021         rc = register_supported_control( LDAP_CONTROL_SYNC,
3022                 SLAP_CTRL_SEARCH, NULL,
3023                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3024         if ( rc != LDAP_SUCCESS ) {
3025                 Debug( LDAP_DEBUG_ANY,
3026                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3027                 return rc;
3028         }
3029
3030         syncprov.on_bi.bi_type = "syncprov";
3031         syncprov.on_bi.bi_db_init = syncprov_db_init;
3032         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3033         syncprov.on_bi.bi_db_open = syncprov_db_open;
3034         syncprov.on_bi.bi_db_close = syncprov_db_close;
3035
3036         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3037         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3038
3039         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3040         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3041         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3042         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3043         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3044         syncprov.on_bi.bi_op_search = syncprov_op_search;
3045         syncprov.on_bi.bi_extended = syncprov_op_extended;
3046         syncprov.on_bi.bi_operational = syncprov_operational;
3047
3048         syncprov.on_bi.bi_cf_ocs = spocs;
3049
3050         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3051
3052         rc = config_register_schema( spcfg, spocs );
3053         if ( rc ) return rc;
3054
3055         return overlay_register( &syncprov );
3056 }
3057
3058 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3059 int
3060 init_module( int argc, char *argv[] )
3061 {
3062         return syncprov_initialize();
3063 }
3064 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3065
3066 #endif /* defined(SLAPD_OVER_SYNCPROV) */