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 2004-2005 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
  30 /* A modify request on a particular entry */
  31 typedef struct modinst {
  32         struct modinst *mi_next;
  33         Operation *mi_op;
  34 } modinst;
  35
  36 typedef struct modtarget {
  37         struct modinst *mt_mods;
  38         struct modinst *mt_tail;
  39         Operation *mt_op;
  40         ldap_pvt_thread_mutex_t mt_mutex;
  41 } modtarget;
  42
  43 /* A queued result of a persistent search */
  44 typedef struct syncres {
  45         struct syncres *s_next;
  46         struct berval s_dn;
  47         struct berval s_ndn;
  48         struct berval s_uuid;
  49         struct berval s_csn;
  50         char s_mode;
  51         char s_isreference;
  52 } syncres;
  53
  54 /* Record of a persistent search */
  55 typedef struct syncops {
  56         struct syncops *s_next;
  57         struct berval   s_base;         /* ndn of search base */
  58         ID              s_eid;          /* entryID of search base */
  59         Operation       *s_op;          /* search op */
  60         int             s_rid;
  61         struct berval s_filterstr;
  62         int             s_flags;        /* search status */
  63         int             s_inuse;        /* reference count */
  64         struct syncres *s_res;
  65         struct syncres *s_restail;
  66         ldap_pvt_thread_mutex_t s_mutex;
  67 } syncops;
  68
  69 /* A received sync control */
  70 typedef struct sync_control {
  71         struct sync_cookie sr_state;
  72         int sr_rhint;
  73 } sync_control;
  74
  75 #if 0 /* moved back to slap.h */
  76 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  77 #endif
  78 /* o_sync_mode uses data bits of o_sync */
  79 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  80
  81 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  84 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  85
  86 #define PS_IS_REFRESHING        0x01
  87 #define PS_IS_DETACHED          0x02
  88
  89 /* Record of which searches matched at premodify step */
  90 typedef struct syncmatches {
  91         struct syncmatches *sm_next;
  92         syncops *sm_op;
  93 } syncmatches;
  94
  95 /* Session log data */
  96 typedef struct slog_entry {
  97         struct slog_entry *se_next;
  98         struct berval se_uuid;
  99         struct berval se_csn;
 100         ber_tag_t       se_tag;
 101 } slog_entry;
 102
 103 typedef struct sessionlog {
 104         struct berval   sl_mincsn;
 105         int             sl_num;
 106         int             sl_size;
 107         slog_entry *sl_head;
 108         slog_entry *sl_tail;
 109         ldap_pvt_thread_mutex_t sl_mutex;
 110 } sessionlog;
 111
 112 /* The main state for this overlay */
 113 typedef struct syncprov_info_t {
 114         syncops         *si_ops;
 115         struct berval   si_ctxcsn;      /* ldapsync context */
 116         int             si_chkops;      /* checkpointing info */
 117         int             si_chktime;
 118         int             si_numops;      /* number of ops since last checkpoint */
 119         time_t  si_chklast;     /* time of last checkpoint */
 120         Avlnode *si_mods;       /* entries being modified */
 121         sessionlog      *si_logs;
 122         ldap_pvt_thread_mutex_t si_csn_mutex;
 123         ldap_pvt_thread_mutex_t si_ops_mutex;
 124         ldap_pvt_thread_mutex_t si_mods_mutex;
 125         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 126 } syncprov_info_t;
 127
 128 typedef struct opcookie {
 129         slap_overinst *son;
 130         syncmatches *smatches;
 131         struct berval sdn;      /* DN of entry, for deletes */
 132         struct berval sndn;
 133         struct berval suuid;    /* UUID of entry */
 134         struct berval sctxcsn;
 135         int sreference; /* Is the entry a reference? */
 136 } opcookie;
 137
 138 typedef struct fbase_cookie {
 139         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 140         syncops *fss;   /* persistent search we're testing against */
 141         int fbase;      /* if TRUE we found the search base and it's still valid */
 142         int fscope;     /* if TRUE then fdn is within the psearch scope */
 143 } fbase_cookie;
 144
 145 static AttributeName csn_anlist[2];
 146 static AttributeName uuid_anlist[2];
 147
 148 /* Build a LDAPsync intermediate state control */
 149 static int
 150 syncprov_state_ctrl(
 151         Operation       *op,
 152         SlapReply       *rs,
 153         Entry           *e,
 154         int             entry_sync_state,
 155         LDAPControl     **ctrls,
 156         int             num_ctrls,
 157         int             send_cookie,
 158         struct berval   *cookie )
 159 {
 160         Attribute* a;
 161         int ret;
 162
 163         BerElementBuffer berbuf;
 164         BerElement *ber = (BerElement *)&berbuf;
 165
 166         struct berval   entryuuid_bv = BER_BVNULL;
 167
 168         ber_init2( ber, 0, LBER_USE_DER );
 169         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 170
 171         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 172
 173         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 174                 AttributeDescription *desc = a->a_desc;
 175                 if ( desc == slap_schema.si_ad_entryUUID ) {
 176                         entryuuid_bv = a->a_nvals[0];
 177                         break;
 178                 }
 179         }
 180
 181         if ( send_cookie && cookie ) {
 182                 ber_printf( ber, "{eOON}",
 183                         entry_sync_state, &entryuuid_bv, cookie );
 184         } else {
 185                 ber_printf( ber, "{eON}",
 186                         entry_sync_state, &entryuuid_bv );
 187         }
 188
 189         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 190         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 191         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 192
 193         ber_free_buf( ber );
 194
 195         if ( ret < 0 ) {
 196                 Debug( LDAP_DEBUG_TRACE,
 197                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 198                         0, 0, 0 );
 199                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 200                 return ret;
 201         }
 202
 203         return LDAP_SUCCESS;
 204 }
 205
 206 /* Build a LDAPsync final state control */
 207 static int
 208 syncprov_done_ctrl(
 209         Operation       *op,
 210         SlapReply       *rs,
 211         LDAPControl     **ctrls,
 212         int                     num_ctrls,
 213         int                     send_cookie,
 214         struct berval *cookie,
 215         int                     refreshDeletes )
 216 {
 217         int ret;
 218         BerElementBuffer berbuf;
 219         BerElement *ber = (BerElement *)&berbuf;
 220
 221         ber_init2( ber, NULL, LBER_USE_DER );
 222         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 223
 224         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 225
 226         ber_printf( ber, "{" );
 227         if ( send_cookie && cookie ) {
 228                 ber_printf( ber, "O", cookie );
 229         }
 230         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 231                 ber_printf( ber, "b", refreshDeletes );
 232         }
 233         ber_printf( ber, "N}" );
 234
 235         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 236         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 237         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 238
 239         ber_free_buf( ber );
 240
 241         if ( ret < 0 ) {
 242                 Debug( LDAP_DEBUG_TRACE,
 243                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 244                         0, 0, 0 );
 245                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 246                 return ret;
 247         }
 248
 249         return LDAP_SUCCESS;
 250 }
 251
 252 static int
 253 syncprov_sendinfo(
 254         Operation       *op,
 255         SlapReply       *rs,
 256         int                     type,
 257         struct berval *cookie,
 258         int                     refreshDone,
 259         BerVarray       syncUUIDs,
 260         int                     refreshDeletes )
 261 {
 262         BerElementBuffer berbuf;
 263         BerElement *ber = (BerElement *)&berbuf;
 264         struct berval rspdata;
 265
 266         int ret;
 267
 268         ber_init2( ber, NULL, LBER_USE_DER );
 269         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 270
 271         if ( type ) {
 272                 switch ( type ) {
 273                 case LDAP_TAG_SYNC_NEW_COOKIE:
 274                         ber_printf( ber, "tO", type, cookie );
 275                         break;
 276                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 277                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 278                         ber_printf( ber, "t{", type );
 279                         if ( cookie ) {
 280                                 ber_printf( ber, "O", cookie );
 281                         }
 282                         if ( refreshDone == 0 ) {
 283                                 ber_printf( ber, "b", refreshDone );
 284                         }
 285                         ber_printf( ber, "N}" );
 286                         break;
 287                 case LDAP_TAG_SYNC_ID_SET:
 288                         ber_printf( ber, "t{", type );
 289                         if ( cookie ) {
 290                                 ber_printf( ber, "O", cookie );
 291                         }
 292                         if ( refreshDeletes == 1 ) {
 293                                 ber_printf( ber, "b", refreshDeletes );
 294                         }
 295                         ber_printf( ber, "[W]", syncUUIDs );
 296                         ber_printf( ber, "N}" );
 297                         break;
 298                 default:
 299                         Debug( LDAP_DEBUG_TRACE,
 300                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 301                                 type, 0, 0 );
 302                         return LDAP_OTHER;
 303                 }
 304         }
 305
 306         ret = ber_flatten2( ber, &rspdata, 0 );
 307
 308         if ( ret < 0 ) {
 309                 Debug( LDAP_DEBUG_TRACE,
 310                         "syncprov_sendinfo: ber_flatten2 failed\n",
 311                         0, 0, 0 );
 312                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 313                 return ret;
 314         }
 315
 316         rs->sr_rspoid = LDAP_SYNC_INFO;
 317         rs->sr_rspdata = &rspdata;
 318         send_ldap_intermediate( op, rs );
 319         rs->sr_rspdata = NULL;
 320         ber_free_buf( ber );
 321
 322         return LDAP_SUCCESS;
 323 }
 324
 325 /* Find a modtarget in an AVL tree */
 326 static int
 327 sp_avl_cmp( const void *c1, const void *c2 )
 328 {
 329         const modtarget *m1, *m2;
 330         int rc;
 331
 332         m1 = c1; m2 = c2;
 333         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 334
 335         if ( rc ) return rc;
 336         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 337 }
 338
 339 /* syncprov_findbase:
 340  *   finds the true DN of the base of a search (with alias dereferencing) and
 341  * checks to make sure the base entry doesn't get replaced with a different
 342  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 343  * change is detected, any persistent search on this base must be terminated /
 344  * reloaded.
 345  *   On the first call, we just save the DN and entryID. On subsequent calls
 346  * we compare the DN and entryID with the saved values.
 347  */
 348 static int
 349 findbase_cb( Operation *op, SlapReply *rs )
 350 {
 351         slap_callback *sc = op->o_callback;
 352
 353         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 354                 fbase_cookie *fc = sc->sc_private;
 355
 356                 /* If no entryID, we're looking for the first time.
 357                  * Just store whatever we got.
 358                  */
 359                 if ( fc->fss->s_eid == NOID ) {
 360                         fc->fbase = 1;
 361                         fc->fss->s_eid = rs->sr_entry->e_id;
 362                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 363
 364                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 365                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 366
 367                 /* OK, the DN is the same and the entryID is the same. Now
 368                  * see if the fdn resides in the scope.
 369                  */
 370                         fc->fbase = 1;
 371                         switch ( fc->fss->s_op->ors_scope ) {
 372                         case LDAP_SCOPE_BASE:
 373                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 374                                 break;
 375                         case LDAP_SCOPE_ONELEVEL: {
 376                                 struct berval pdn;
 377                                 dnParent( fc->fdn, &pdn );
 378                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 379                                 break; }
 380                         case LDAP_SCOPE_SUBTREE:
 381                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 382                                 break;
 383 #ifdef LDAP_SCOPE_SUBORDINATE
 384                         case LDAP_SCOPE_SUBORDINATE:
 385                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 386                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 387                                 break;
 388 #endif
 389                         }
 390                 }
 391         }
 392         if ( rs->sr_err != LDAP_SUCCESS ) {
 393                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 394         }
 395         return LDAP_SUCCESS;
 396 }
 397
 398 static int
 399 syncprov_findbase( Operation *op, fbase_cookie *fc )
 400 {
 401         opcookie *opc = op->o_callback->sc_private;
 402         slap_overinst *on = opc->son;
 403
 404         slap_callback cb = {0};
 405         Operation fop;
 406         SlapReply frs = { REP_RESULT };
 407         int rc;
 408
 409         fop = *op;
 410
 411         cb.sc_response = findbase_cb;
 412         cb.sc_private = fc;
 413
 414         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 415         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 416         fop.o_callback = &cb;
 417         fop.o_tag = LDAP_REQ_SEARCH;
 418         fop.ors_scope = LDAP_SCOPE_BASE;
 419         fop.ors_deref = fc->fss->s_op->ors_deref;
 420         fop.ors_limit = NULL;
 421         fop.ors_slimit = 1;
 422         fop.ors_tlimit = SLAP_NO_LIMIT;
 423         fop.ors_attrs = slap_anlist_no_attrs;
 424         fop.ors_attrsonly = 1;
 425         fop.ors_filter = fc->fss->s_op->ors_filter;
 426         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 427
 428         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 429
 430         fop.o_bd->bd_info = on->on_info->oi_orig;
 431         rc = fop.o_bd->be_search( &fop, &frs );
 432         fop.o_bd->bd_info = (BackendInfo *)on;
 433
 434         if ( fc->fbase ) return LDAP_SUCCESS;
 435
 436         /* If entryID has changed, then the base of this search has
 437          * changed. Invalidate the psearch.
 438          */
 439         return LDAP_NO_SUCH_OBJECT;
 440 }
 441
 442 /* syncprov_findcsn:
 443  *   This function has three different purposes, but they all use a search
 444  * that filters on entryCSN so they're combined here.
 445  * 1: at startup time, after a contextCSN has been read from the database,
 446  * we search for all entries with CSN >= contextCSN in case the contextCSN
 447  * was not checkpointed at the previous shutdown.
 448  *
 449  * 2: when the current contextCSN is known and we have a sync cookie, we search
 450  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 451  * entry is found, the cookie CSN is valid, otherwise it is stale.
 452  *
 453  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 454  * CSN, and generate Present records for them. We always collect this result
 455  * in SyncID sets, even if there's only one match.
 456  */
 457 #define FIND_MAXCSN     1
 458 #define FIND_CSN        2
 459 #define FIND_PRESENT    3
 460
 461 static int
 462 findmax_cb( Operation *op, SlapReply *rs )
 463 {
 464         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 465                 struct berval *maxcsn = op->o_callback->sc_private;
 466                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 467                         slap_schema.si_ad_entryCSN );
 468
 469                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 470                         maxcsn->bv_len = a->a_vals[0].bv_len;
 471                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 472                 }
 473         }
 474         return LDAP_SUCCESS;
 475 }
 476
 477 static int
 478 findcsn_cb( Operation *op, SlapReply *rs )
 479 {
 480         slap_callback *sc = op->o_callback;
 481
 482         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 483                 sc->sc_private = (void *)1;
 484         }
 485         return LDAP_SUCCESS;
 486 }
 487
 488 /* Build a list of entryUUIDs for sending in a SyncID set */
 489
 490 #define UUID_LEN        16
 491
 492 typedef struct fpres_cookie {
 493         int num;
 494         BerVarray uuids;
 495         char *last;
 496 } fpres_cookie;
 497
 498 static int
 499 findpres_cb( Operation *op, SlapReply *rs )
 500 {
 501         slap_callback *sc = op->o_callback;
 502         fpres_cookie *pc = sc->sc_private;
 503         Attribute *a;
 504         int ret = SLAP_CB_CONTINUE;
 505
 506         switch ( rs->sr_type ) {
 507         case REP_SEARCH:
 508                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 509                 if ( a ) {
 510                         pc->uuids[pc->num].bv_val = pc->last;
 511                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 512                                 pc->uuids[pc->num].bv_len );
 513                         pc->num++;
 514                         pc->last = pc->uuids[pc->num].bv_val;
 515                         pc->uuids[pc->num].bv_val = NULL;
 516                 }
 517                 ret = LDAP_SUCCESS;
 518                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 519                         break;
 520                 /* FALLTHRU */
 521         case REP_RESULT:
 522                 ret = rs->sr_err;
 523                 if ( pc->num ) {
 524                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 525                                 0, pc->uuids, 0 );
 526                         pc->uuids[pc->num].bv_val = pc->last;
 527                         pc->num = 0;
 528                         pc->last = pc->uuids[0].bv_val;
 529                 }
 530                 break;
 531         default:
 532                 break;
 533         }
 534         return ret;
 535 }
 536
 537 static int
 538 syncprov_findcsn( Operation *op, int mode )
 539 {
 540         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 541         syncprov_info_t         *si = on->on_bi.bi_private;
 542
 543         slap_callback cb = {0};
 544         Operation fop;
 545         SlapReply frs = { REP_RESULT };
 546         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 547         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 548         struct berval maxcsn;
 549         Filter cf, af;
 550 #ifdef LDAP_COMP_MATCH
 551         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 552 #else
 553         AttributeAssertion eq = { NULL, BER_BVNULL };
 554 #endif
 555         int i, rc = LDAP_SUCCESS;
 556         fpres_cookie pcookie;
 557         sync_control *srs = NULL;
 558
 559         if ( mode != FIND_MAXCSN ) {
 560                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 561
 562                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 563                         return LDAP_OTHER;
 564                 }
 565         }
 566
 567         fop = *op;
 568         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 569         /* We want pure entries, not referrals */
 570         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 571
 572         cf.f_ava = &eq;
 573         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 574         cf.f_next = NULL;
 575
 576         fop.o_callback = &cb;
 577         fop.ors_limit = NULL;
 578         fop.ors_tlimit = SLAP_NO_LIMIT;
 579         fop.ors_filter = &cf;
 580         fop.ors_filterstr.bv_val = buf;
 581
 582         switch( mode ) {
 583         case FIND_MAXCSN:
 584                 cf.f_choice = LDAP_FILTER_GE;
 585                 cf.f_av_value = si->si_ctxcsn;
 586                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 587                         cf.f_av_value.bv_val );
 588                 fop.ors_attrsonly = 0;
 589                 fop.ors_attrs = csn_anlist;
 590                 fop.ors_slimit = SLAP_NO_LIMIT;
 591                 cb.sc_private = &maxcsn;
 592                 cb.sc_response = findmax_cb;
 593                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 594                 maxcsn.bv_val = cbuf;
 595                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 596                 break;
 597         case FIND_CSN:
 598                 cf.f_choice = LDAP_FILTER_LE;
 599                 cf.f_av_value = srs->sr_state.ctxcsn;
 600                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 601                         cf.f_av_value.bv_val );
 602                 fop.ors_attrsonly = 1;
 603                 fop.ors_attrs = slap_anlist_no_attrs;
 604                 fop.ors_slimit = 1;
 605                 cb.sc_private = NULL;
 606                 cb.sc_response = findcsn_cb;
 607                 break;
 608         case FIND_PRESENT:
 609                 af.f_choice = LDAP_FILTER_AND;
 610                 af.f_next = NULL;
 611                 af.f_and = &cf;
 612                 cf.f_choice = LDAP_FILTER_LE;
 613                 cf.f_av_value = srs->sr_state.ctxcsn;
 614                 cf.f_next = op->ors_filter;
 615                 fop.ors_filter = &af;
 616                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 617                 fop.ors_attrsonly = 0;
 618                 fop.ors_attrs = uuid_anlist;
 619                 fop.ors_slimit = SLAP_NO_LIMIT;
 620                 cb.sc_private = &pcookie;
 621                 cb.sc_response = findpres_cb;
 622                 pcookie.num = 0;
 623
 624                 /* preallocate storage for a full set */
 625                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 626                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 627                         op->o_tmpmemctx );
 628                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 629                 pcookie.uuids[0].bv_val = pcookie.last;
 630                 pcookie.uuids[0].bv_len = UUID_LEN;
 631                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 632                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 633                         pcookie.uuids[i].bv_len = UUID_LEN;
 634                 }
 635                 break;
 636         }
 637
 638         fop.o_bd->bd_info = on->on_info->oi_orig;
 639         fop.o_bd->be_search( &fop, &frs );
 640         fop.o_bd->bd_info = (BackendInfo *)on;
 641
 642         switch( mode ) {
 643         case FIND_MAXCSN:
 644                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 645                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 646                 break;
 647         case FIND_CSN:
 648                 /* If matching CSN was not found, invalidate the context. */
 649                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 650                 break;
 651         case FIND_PRESENT:
 652                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 653                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 654                 break;
 655         }
 656
 657         return rc;
 658 }
 659
 660 /* Queue a persistent search response */
 661 static int
 662 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 663 {
 664         syncres *sr;
 665
 666         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 667                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 668         sr->s_next = NULL;
 669         sr->s_dn.bv_val = (char *)(sr + 1);
 670         sr->s_dn.bv_len = opc->sdn.bv_len;
 671         sr->s_mode = mode;
 672         sr->s_isreference = opc->sreference;
 673         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 674         sr->s_ndn.bv_len = opc->sndn.bv_len;
 675         *(sr->s_ndn.bv_val++) = '\0';
 676         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 677         sr->s_uuid.bv_len = opc->suuid.bv_len;
 678         *(sr->s_uuid.bv_val++) = '\0';
 679         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 680         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 681         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 682
 683         if ( !so->s_res ) {
 684                 so->s_res = sr;
 685         } else {
 686                 so->s_restail->s_next = sr;
 687         }
 688         so->s_restail = sr;
 689         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 690         return LDAP_SUCCESS;
 691 }
 692
 693 /* Play back queued responses */
 694 static int
 695 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue );
 696
 697 static int
 698 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 699 {
 700         syncres *sr, *srnext;
 701         Entry *e;
 702         opcookie opc;
 703         int rc;
 704
 705         opc.son = on;
 706         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 707         for (sr = so->s_res; sr; sr=srnext) {
 708                 srnext = sr->s_next;
 709                 opc.sdn = sr->s_dn;
 710                 opc.sndn = sr->s_ndn;
 711                 opc.suuid = sr->s_uuid;
 712                 opc.sctxcsn = sr->s_csn;
 713                 opc.sreference = sr->s_isreference;
 714                 e = NULL;
 715
 716                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 717                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 718                         if ( rc ) {
 719                                 ch_free( sr );
 720                                 so->s_res = srnext;
 721                                 continue;
 722                         }
 723                 }
 724                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode, 0 );
 725
 726                 if ( e ) {
 727                         be_entry_release_rw( op, e, 0 );
 728                 }
 729                 if ( rc )
 730                         break;
 731
 732                 ch_free( sr );
 733                 so->s_res = srnext;
 734         }
 735         op->o_bd->bd_info = (BackendInfo *)on;
 736         if ( !so->s_res )
 737                 so->s_restail = NULL;
 738         return rc;
 739 }
 740
 741 /* Send a persistent search response */
 742 static int
 743 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue )
 744 {
 745         slap_overinst *on = opc->son;
 746
 747         SlapReply rs = { REP_SEARCH };
 748         LDAPControl *ctrls[2];
 749         struct berval cookie;
 750         Entry e_uuid = {0};
 751         Attribute a_uuid = {0};
 752         Operation sop = *so->s_op;
 753         Opheader ohdr;
 754
 755         if ( so->s_op->o_abandon )
 756                 return SLAPD_ABANDON;
 757
 758         ohdr = *sop.o_hdr;
 759         sop.o_hdr = &ohdr;
 760         sop.o_tmpmemctx = op->o_tmpmemctx;
 761         sop.o_bd = op->o_bd;
 762         sop.o_controls = op->o_controls;
 763         sop.o_private = op->o_private;
 764
 765         /* If queueing is allowed */
 766         if ( queue ) {
 767                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 768                 /* If we're still in refresh mode, must queue */
 769                 if (so->s_flags & PS_IS_REFRESHING) {
 770                         return syncprov_qresp( opc, so, mode );
 771                 }
 772                 /* If connection is free but queue is non-empty,
 773                  * try to flush the queue.
 774                  */
 775                 if ( so->s_res ) {
 776                         rs.sr_err = syncprov_qplay( &sop, on, so );
 777                 }
 778                 /* If the connection is busy, must queue */
 779                 if ( sop.o_conn->c_writewaiter || rs.sr_err == LDAP_BUSY ) {
 780                         return syncprov_qresp( opc, so, mode );
 781                 }
 782                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 783
 784                 /* If syncprov_qplay returned any other error, bail out. */
 785                 if ( rs.sr_err ) {
 786                         return rs.sr_err;
 787                 }
 788         } else {
 789                 /* Queueing not allowed and conn is busy, give up */
 790                 if ( sop.o_conn->c_writewaiter )
 791                         return LDAP_BUSY;
 792         }
 793
 794         ctrls[1] = NULL;
 795         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 796
 797         e_uuid.e_attrs = &a_uuid;
 798         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 799         a_uuid.a_nvals = &opc->suuid;
 800         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 801                 mode, ctrls, 0, 1, &cookie );
 802
 803         rs.sr_ctrls = ctrls;
 804         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 805         switch( mode ) {
 806         case LDAP_SYNC_ADD:
 807                 rs.sr_entry = *e;
 808                 if ( rs.sr_entry->e_private )
 809                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 810                 if ( opc->sreference ) {
 811                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 812                         send_search_reference( &sop, &rs );
 813                         ber_bvarray_free( rs.sr_ref );
 814                         if ( !rs.sr_entry )
 815                                 *e = NULL;
 816                         break;
 817                 }
 818                 /* fallthru */
 819         case LDAP_SYNC_MODIFY:
 820                 rs.sr_entry = *e;
 821                 if ( rs.sr_entry->e_private )
 822                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 823                 rs.sr_attrs = sop.ors_attrs;
 824                 send_search_entry( &sop, &rs );
 825                 if ( !rs.sr_entry )
 826                         *e = NULL;
 827                 break;
 828         case LDAP_SYNC_DELETE:
 829                 e_uuid.e_attrs = NULL;
 830                 e_uuid.e_name = opc->sdn;
 831                 e_uuid.e_nname = opc->sndn;
 832                 rs.sr_entry = &e_uuid;
 833                 if ( opc->sreference ) {
 834                         struct berval bv = BER_BVNULL;
 835                         rs.sr_ref = &bv;
 836                         send_search_reference( &sop, &rs );
 837                 } else {
 838                         send_search_entry( &sop, &rs );
 839                 }
 840                 break;
 841         default:
 842                 assert(0);
 843         }
 844         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 845         op->o_private = sop.o_private;
 846         rs.sr_ctrls = NULL;
 847         /* Check queue again here; if we were hanging in a send and eventually
 848          * recovered, there may be more to send now. But don't check if the
 849          * original psearch has been abandoned.
 850          */
 851         if ( so->s_op->o_abandon )
 852                 return SLAPD_ABANDON;
 853
 854         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 855                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 856                 rs.sr_err = syncprov_qplay( &sop, on, so );
 857                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 858         }
 859         return rs.sr_err;
 860 }
 861
 862 static void
 863 syncprov_free_syncop( syncops *so )
 864 {
 865         syncres *sr, *srnext;
 866         GroupAssertion *ga, *gnext;
 867
 868         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 869         so->s_inuse--;
 870         if ( so->s_inuse > 0 ) {
 871                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 872                 return;
 873         }
 874         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 875         if ( so->s_flags & PS_IS_DETACHED ) {
 876                 filter_free( so->s_op->ors_filter );
 877                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 878                         gnext = ga->ga_next;
 879                         ch_free( ga );
 880                 }
 881                 ch_free( so->s_op );
 882         }
 883         ch_free( so->s_base.bv_val );
 884         for ( sr=so->s_res; sr; sr=srnext ) {
 885                 srnext = sr->s_next;
 886                 ch_free( sr );
 887         }
 888         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 889         ch_free( so );
 890 }
 891
 892 static int
 893 syncprov_drop_psearch( syncops *so, int lock )
 894 {
 895         if ( so->s_flags & PS_IS_DETACHED ) {
 896                 if ( lock )
 897                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 898                 so->s_op->o_conn->c_n_ops_executing--;
 899                 so->s_op->o_conn->c_n_ops_completed++;
 900                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 901                         o_next );
 902                 if ( lock )
 903                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 904         }
 905         syncprov_free_syncop( so );
 906
 907         return 0;
 908 }
 909
 910 static int
 911 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 912 {
 913         slap_callback *sc = op->o_callback;
 914         op->o_callback = sc->sc_next;
 915         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 916         op->o_tmpfree( sc, op->o_tmpmemctx );
 917         return 0;
 918 }
 919
 920 static int
 921 syncprov_op_abandon( Operation *op, SlapReply *rs )
 922 {
 923         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 924         syncprov_info_t         *si = on->on_bi.bi_private;
 925         syncops *so, *soprev;
 926
 927         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 928         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 929                 soprev=so, so=so->s_next ) {
 930                 if ( so->s_op->o_connid == op->o_connid &&
 931                         so->s_op->o_msgid == op->orn_msgid ) {
 932                                 so->s_op->o_abandon = 1;
 933                                 soprev->s_next = so->s_next;
 934                                 break;
 935                 }
 936         }
 937         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 938         if ( so ) {
 939                 /* Is this really a Cancel exop? */
 940                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 941                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 942                         rs->sr_err = LDAP_CANCELLED;
 943                         send_ldap_result( so->s_op, rs );
 944                         if ( so->s_flags & PS_IS_DETACHED ) {
 945                                 slap_callback *cb;
 946                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 947                                 cb->sc_cleanup = syncprov_ab_cleanup;
 948                                 cb->sc_next = op->o_callback;
 949                                 cb->sc_private = so;
 950                                 return SLAP_CB_CONTINUE;
 951                         }
 952                 }
 953                 syncprov_drop_psearch( so, 0 );
 954         }
 955         return SLAP_CB_CONTINUE;
 956 }
 957
 958 /* Find which persistent searches are affected by this operation */
 959 static void
 960 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 961 {
 962         slap_overinst *on = opc->son;
 963         syncprov_info_t         *si = on->on_bi.bi_private;
 964
 965         fbase_cookie fc;
 966         syncops *ss, *sprev, *snext;
 967         Entry *e;
 968         Attribute *a;
 969         int rc;
 970         struct berval newdn;
 971         int freefdn = 0;
 972
 973         fc.fdn = &op->o_req_ndn;
 974         /* compute new DN */
 975         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 976                 struct berval pdn;
 977                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 978                 else dnParent( fc.fdn, &pdn );
 979                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 980                 fc.fdn = &newdn;
 981                 freefdn = 1;
 982         }
 983         if ( op->o_tag != LDAP_REQ_ADD ) {
 984                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 985                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 986                 /* If we're sending responses now, make a copy and unlock the DB */
 987                 if ( e && !saveit ) {
 988                         Entry *e2 = entry_dup( e );
 989                         be_entry_release_rw( op, e, 0 );
 990                         e = e2;
 991                 }
 992                 op->o_bd->bd_info = (BackendInfo *)on;
 993                 if ( rc ) return;
 994         } else {
 995                 e = op->ora_e;
 996         }
 997
 998         if ( saveit ) {
 999                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1000                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1001                 opc->sreference = is_entry_referral( e );
1002         }
1003         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1004                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1005                 if ( a )
1006                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1007         }
1008
1009         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1010         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1011                 sprev = ss, ss=snext)
1012         {
1013                 syncmatches *sm;
1014                 int found = 0;
1015
1016                 snext = ss->s_next;
1017                 /* validate base */
1018                 fc.fss = ss;
1019                 fc.fbase = 0;
1020                 fc.fscope = 0;
1021
1022                 /* If the base of the search is missing, signal a refresh */
1023                 rc = syncprov_findbase( op, &fc );
1024                 if ( rc != LDAP_SUCCESS ) {
1025                         SlapReply rs = {REP_RESULT};
1026                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1027                                 "search base has changed" );
1028                         sprev->s_next = snext;
1029                         syncprov_drop_psearch( ss, 1 );
1030                         continue;
1031                 }
1032
1033                 /* If we're sending results now, look for this op in old matches */
1034                 if ( !saveit ) {
1035                         syncmatches *old;
1036                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1037                                 old=sm, sm=sm->sm_next ) {
1038                                 if ( sm->sm_op == ss ) {
1039                                         found = 1;
1040                                         old->sm_next = sm->sm_next;
1041                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1042                                         break;
1043                                 }
1044                         }
1045                 }
1046
1047                 /* check if current o_req_dn is in scope and matches filter */
1048                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1049                         LDAP_COMPARE_TRUE ) {
1050                         if ( saveit ) {
1051                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1052                                 sm->sm_next = opc->smatches;
1053                                 sm->sm_op = ss;
1054                                 ss->s_inuse++;
1055                                 opc->smatches = sm;
1056                         } else {
1057                                 /* if found send UPDATE else send ADD */
1058                                 ss->s_inuse++;
1059                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1060                                 syncprov_sendresp( op, opc, ss, &e,
1061                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1062                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1063                                 ss->s_inuse--;
1064                         }
1065                 } else if ( !saveit && found ) {
1066                         /* send DELETE */
1067                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1068                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1069                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1070                 }
1071         }
1072         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1073
1074         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1075                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1076                 be_entry_release_rw( op, e, 0 );
1077                 op->o_bd->bd_info = (BackendInfo *)on;
1078         }
1079         if ( freefdn ) {
1080                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1081         }
1082 }
1083
1084 static int
1085 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1086 {
1087         slap_callback *cb = op->o_callback;
1088         opcookie *opc = cb->sc_private;
1089         slap_overinst *on = opc->son;
1090         syncprov_info_t         *si = on->on_bi.bi_private;
1091         syncmatches *sm, *snext;
1092         modtarget *mt, mtdummy;
1093
1094         for (sm = opc->smatches; sm; sm=snext) {
1095                 snext = sm->sm_next;
1096                 syncprov_free_syncop( sm->sm_op );
1097                 op->o_tmpfree( sm, op->o_tmpmemctx );
1098         }
1099
1100         /* Remove op from lock table */
1101         mtdummy.mt_op = op;
1102         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1103         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1104         if ( mt ) {
1105                 modinst *mi = mt->mt_mods;
1106
1107                 /* If there are more, promote the next one */
1108                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1109                 if ( mi->mi_next ) {
1110                         mt->mt_mods = mi->mi_next;
1111                         mt->mt_op = mt->mt_mods->mi_op;
1112                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1113                 } else {
1114                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1115                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1116                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1117                         ch_free( mt );
1118                 }
1119         }
1120         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1121         if ( !BER_BVISNULL( &opc->suuid ))
1122                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1123         if ( !BER_BVISNULL( &opc->sndn ))
1124                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1125         if ( !BER_BVISNULL( &opc->sdn ))
1126                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1127         op->o_callback = cb->sc_next;
1128         op->o_tmpfree(cb, op->o_tmpmemctx);
1129
1130         return 0;
1131 }
1132
1133 static void
1134 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1135 {
1136         syncprov_info_t         *si = on->on_bi.bi_private;
1137         Modifications mod;
1138         Operation opm;
1139         struct berval bv[2];
1140         slap_callback cb = {0};
1141         int manage = get_manageDSAit(op);
1142
1143         mod.sml_values = bv;
1144         bv[1].bv_val = NULL;
1145         bv[0] = si->si_ctxcsn;
1146         mod.sml_nvalues = NULL;
1147         mod.sml_desc = slap_schema.si_ad_contextCSN;
1148         mod.sml_op = LDAP_MOD_REPLACE;
1149         mod.sml_flags = 0;
1150         mod.sml_next = NULL;
1151
1152         cb.sc_response = slap_null_cb;
1153         opm = *op;
1154         opm.o_tag = LDAP_REQ_MODIFY;
1155         opm.o_callback = &cb;
1156         opm.orm_modlist = &mod;
1157         opm.o_req_dn = op->o_bd->be_suffix[0];
1158         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1159         opm.o_bd->bd_info = on->on_info->oi_orig;
1160         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1161         opm.o_bd->be_modify( &opm, rs );
1162         opm.o_managedsait = manage;
1163 }
1164
1165 static void
1166 syncprov_add_slog( Operation *op, struct berval *csn )
1167 {
1168         opcookie *opc = op->o_callback->sc_private;
1169         slap_overinst *on = opc->son;
1170         syncprov_info_t         *si = on->on_bi.bi_private;
1171         sessionlog *sl;
1172         slog_entry *se;
1173
1174         sl = si->si_logs;
1175         {
1176                 /* Allocate a record. UUIDs are not NUL-terminated. */
1177                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1178                         csn->bv_len + 1 );
1179                 se->se_next = NULL;
1180                 se->se_tag = op->o_tag;
1181
1182                 se->se_uuid.bv_val = (char *)(se+1);
1183                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1184                 se->se_uuid.bv_len = opc->suuid.bv_len;
1185
1186                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1187                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1188                 se->se_csn.bv_val[csn->bv_len] = '\0';
1189                 se->se_csn.bv_len = csn->bv_len;
1190
1191                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1192                 if ( sl->sl_head ) {
1193                         sl->sl_tail->se_next = se;
1194                 } else {
1195                         sl->sl_head = se;
1196                 }
1197                 sl->sl_tail = se;
1198                 sl->sl_num++;
1199                 while ( sl->sl_num > sl->sl_size ) {
1200                         se = sl->sl_head;
1201                         sl->sl_head = se->se_next;
1202                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1203                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1204                         ch_free( se );
1205                         sl->sl_num--;
1206                         if ( !sl->sl_head ) {
1207                                 sl->sl_tail = NULL;
1208                         }
1209                 }
1210                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1211         }
1212 }
1213
1214 /* Just set a flag if we found the matching entry */
1215 static int
1216 playlog_cb( Operation *op, SlapReply *rs )
1217 {
1218         if ( rs->sr_type == REP_SEARCH ) {
1219                 op->o_callback->sc_private = (void *)1;
1220         }
1221         return rs->sr_err;
1222 }
1223
1224 /* enter with sl->sl_mutex locked, release before returning */
1225 static void
1226 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1227         struct berval *oldcsn, struct berval *ctxcsn )
1228 {
1229         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1230         slog_entry *se;
1231         int i, j, ndel, num, nmods, mmods;
1232         BerVarray uuids;
1233
1234         if ( !sl->sl_num ) {
1235                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1236                 return;
1237         }
1238
1239         num = sl->sl_num;
1240         i = 0;
1241         nmods = 0;
1242
1243         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1244                 num * UUID_LEN, op->o_tmpmemctx );
1245
1246         uuids[0].bv_val = (char *)(uuids + num + 1);
1247
1248         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1249          * and everything else at the end. Do this first so we can
1250          * unlock the list mutex.
1251          */
1252         for ( se=sl->sl_head; se; se=se->se_next ) {
1253                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1254                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1255                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1256                         j = i;
1257                         i++;
1258                 } else {
1259                         nmods++;
1260                         j = num - nmods;
1261                 }
1262                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1263                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1264                 uuids[j].bv_len = UUID_LEN;
1265         }
1266         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1267
1268         ndel = i;
1269
1270         /* Zero out unused slots */
1271         for ( i=ndel; i < num - nmods; i++ )
1272                 uuids[i].bv_len = 0;
1273
1274         /* Mods must be validated to see if they belong in this delete set.
1275          */
1276
1277         mmods = nmods;
1278         /* Strip any duplicates */
1279         for ( i=0; i<nmods; i++ ) {
1280                 for ( j=0; j<ndel; j++ ) {
1281                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1282                                 uuids[num - 1 - i].bv_len = 0;
1283                                 mmods --;
1284                                 break;
1285                         }
1286                 }
1287                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1288                 for ( j=0; j<i; j++ ) {
1289                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1290                                 uuids[num - 1 - i].bv_len = 0;
1291                                 mmods --;
1292                                 break;
1293                         }
1294                 }
1295         }
1296
1297         if ( mmods ) {
1298                 Operation fop;
1299                 SlapReply frs = { REP_RESULT };
1300                 int rc;
1301                 Filter mf, af;
1302 #ifdef LDAP_COMP_MATCH
1303                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1304 #else
1305                 AttributeAssertion eq;
1306 #endif
1307                 slap_callback cb = {0};
1308
1309                 fop = *op;
1310
1311                 fop.o_sync_mode = 0;
1312                 fop.o_callback = &cb;
1313                 fop.ors_limit = NULL;
1314                 fop.ors_tlimit = SLAP_NO_LIMIT;
1315                 fop.ors_attrs = slap_anlist_all_attributes;
1316                 fop.ors_attrsonly = 0;
1317                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1318
1319                 af.f_choice = LDAP_FILTER_AND;
1320                 af.f_next = NULL;
1321                 af.f_and = &mf;
1322                 mf.f_choice = LDAP_FILTER_EQUALITY;
1323                 mf.f_ava = &eq;
1324                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1325                 mf.f_next = fop.ors_filter;
1326
1327                 fop.ors_filter = &af;
1328
1329                 cb.sc_response = playlog_cb;
1330                 fop.o_bd->bd_info = on->on_info->oi_orig;
1331
1332                 for ( i=ndel; i<num; i++ ) {
1333                         if ( uuids[i].bv_len == 0 ) continue;
1334
1335                         mf.f_av_value = uuids[i];
1336                         cb.sc_private = NULL;
1337                         fop.ors_slimit = 1;
1338                         rc = fop.o_bd->be_search( &fop, &frs );
1339
1340                         /* If entry was not found, add to delete list */
1341                         if ( !cb.sc_private ) {
1342                                 uuids[ndel++] = uuids[i];
1343                         }
1344                 }
1345                 fop.o_bd->bd_info = (BackendInfo *)on;
1346         }
1347         if ( ndel ) {
1348                 uuids[ndel].bv_val = NULL;
1349                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1350         }
1351 }
1352
1353 static int
1354 syncprov_op_response( Operation *op, SlapReply *rs )
1355 {
1356         opcookie *opc = op->o_callback->sc_private;
1357         slap_overinst *on = opc->son;
1358         syncprov_info_t         *si = on->on_bi.bi_private;
1359         syncmatches *sm;
1360
1361         if ( rs->sr_err == LDAP_SUCCESS )
1362         {
1363                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1364                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1365
1366                 /* Update our context CSN */
1367                 cbuf[0] = '\0';
1368                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1369                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1370                 if ( !BER_BVISNULL( &maxcsn ) ) {
1371                         strcpy( cbuf, maxcsn.bv_val );
1372                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1373                                 strcpy( si->si_ctxcsnbuf, cbuf );
1374                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1375                         }
1376                 }
1377
1378                 /* Don't do any processing for consumer contextCSN updates */
1379                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1380                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1381                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1382                         return SLAP_CB_CONTINUE;
1383                 }
1384
1385                 si->si_numops++;
1386                 if ( si->si_chkops || si->si_chktime ) {
1387                         int do_check=0;
1388                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1389                                 do_check = 1;
1390                                 si->si_numops = 0;
1391                         }
1392                         if ( si->si_chktime &&
1393                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1394                                 do_check = 1;
1395                                 si->si_chklast = op->o_time;
1396                         }
1397                         if ( do_check ) {
1398                                 syncprov_checkpoint( op, rs, on );
1399                         }
1400                 }
1401                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1402
1403                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1404                 opc->sctxcsn.bv_val = cbuf;
1405
1406                 /* Handle any persistent searches */
1407                 if ( si->si_ops ) {
1408                         switch(op->o_tag) {
1409                         case LDAP_REQ_ADD:
1410                         case LDAP_REQ_MODIFY:
1411                         case LDAP_REQ_MODRDN:
1412                         case LDAP_REQ_EXTENDED:
1413                                 syncprov_matchops( op, opc, 0 );
1414                                 break;
1415                         case LDAP_REQ_DELETE:
1416                                 /* for each match in opc->smatches:
1417                                  *   send DELETE msg
1418                                  */
1419                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1420                                         if ( sm->sm_op->s_op->o_abandon )
1421                                                 continue;
1422                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1423                                                 LDAP_SYNC_DELETE, 1 );
1424                                 }
1425                                 break;
1426                         }
1427                 }
1428
1429                 /* Add any log records */
1430                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1431                         syncprov_add_slog( op, &curcsn );
1432                 }
1433
1434         }
1435         return SLAP_CB_CONTINUE;
1436 }
1437
1438 /* We don't use a subentry to store the context CSN any more.
1439  * We expose the current context CSN as an operational attribute
1440  * of the suffix entry.
1441  */
1442 static int
1443 syncprov_op_compare( Operation *op, SlapReply *rs )
1444 {
1445         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1446         syncprov_info_t         *si = on->on_bi.bi_private;
1447         int rc = SLAP_CB_CONTINUE;
1448
1449         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1450                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1451         {
1452                 Entry e = {0};
1453                 Attribute a = {0};
1454                 struct berval bv[2];
1455
1456                 e.e_name = op->o_bd->be_suffix[0];
1457                 e.e_nname = op->o_bd->be_nsuffix[0];
1458
1459                 BER_BVZERO( &bv[1] );
1460                 bv[0] = si->si_ctxcsn;
1461
1462                 a.a_desc = slap_schema.si_ad_contextCSN;
1463                 a.a_vals = bv;
1464                 a.a_nvals = a.a_vals;
1465
1466                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1467
1468                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1469                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1470                 if ( ! rs->sr_err ) {
1471                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1472                         goto return_results;
1473                 }
1474
1475                 if ( get_assert( op ) &&
1476                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1477                 {
1478                         rs->sr_err = LDAP_ASSERTION_FAILED;
1479                         goto return_results;
1480                 }
1481
1482
1483                 rs->sr_err = LDAP_COMPARE_FALSE;
1484
1485                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1486                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1487                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1488                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1489                 {
1490                         rs->sr_err = LDAP_COMPARE_TRUE;
1491                 }
1492
1493 return_results:;
1494
1495                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1496
1497                 send_ldap_result( op, rs );
1498
1499                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1500                         rs->sr_err = LDAP_SUCCESS;
1501                 }
1502                 rc = rs->sr_err;
1503         }
1504
1505         return rc;
1506 }
1507
1508 static int
1509 syncprov_op_mod( Operation *op, SlapReply *rs )
1510 {
1511         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1512         syncprov_info_t         *si = on->on_bi.bi_private;
1513
1514         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1515                 sizeof(opcookie) +
1516                 (si->si_ops ? sizeof(modinst) : 0 ),
1517                 op->o_tmpmemctx);
1518         opcookie *opc = (opcookie *)(cb+1);
1519         opc->son = on;
1520         cb->sc_response = syncprov_op_response;
1521         cb->sc_cleanup = syncprov_op_cleanup;
1522         cb->sc_private = opc;
1523         cb->sc_next = op->o_callback;
1524         op->o_callback = cb;
1525
1526         /* If there are active persistent searches, lock this operation.
1527          * See seqmod.c for the locking logic on its own.
1528          */
1529         if ( si->si_ops ) {
1530                 modtarget *mt, mtdummy;
1531                 modinst *mi;
1532
1533                 mi = (modinst *)(opc+1);
1534                 mi->mi_op = op;
1535
1536                 /* See if we're already modifying this entry... */
1537                 mtdummy.mt_op = op;
1538                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1539                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1540                 if ( mt ) {
1541                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1542                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1543                         mt->mt_tail->mi_next = mi;
1544                         mt->mt_tail = mi;
1545                         /* wait for this op to get to head of list */
1546                         while ( mt->mt_mods != mi ) {
1547                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1548                                 ldap_pvt_thread_yield();
1549                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1550
1551                                 /* clean up if the caller is giving up */
1552                                 if ( op->o_abandon ) {
1553                                         modinst *m2;
1554                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1555                                                 m2 = m2->mi_next );
1556                                         m2->mi_next = mi->mi_next;
1557                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1558                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1559                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1560                                         return SLAPD_ABANDON;
1561                                 }
1562                         }
1563                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1564                 } else {
1565                         /* Record that we're modifying this entry now */
1566                         mt = ch_malloc( sizeof(modtarget) );
1567                         mt->mt_mods = mi;
1568                         mt->mt_tail = mi;
1569                         mt->mt_op = mi->mi_op;
1570                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1571                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1572                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1573                 }
1574         }
1575
1576         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1577                 syncprov_matchops( op, opc, 1 );
1578
1579         return SLAP_CB_CONTINUE;
1580 }
1581
1582 static int
1583 syncprov_op_extended( Operation *op, SlapReply *rs )
1584 {
1585         if ( exop_is_write( op ))
1586                 return syncprov_op_mod( op, rs );
1587
1588         return SLAP_CB_CONTINUE;
1589 }
1590
1591 typedef struct searchstate {
1592         slap_overinst *ss_on;
1593         syncops *ss_so;
1594         int ss_present;
1595 } searchstate;
1596
1597 static int
1598 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1599 {
1600         if ( rs->sr_ctrls ) {
1601                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1602                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1603                 rs->sr_ctrls = NULL;
1604         }
1605         return 0;
1606 }
1607
1608 static void
1609 syncprov_detach_op( Operation *op, syncops *so )
1610 {
1611         Operation *op2;
1612         int i, alen = 0;
1613         size_t size;
1614         char *ptr;
1615         GroupAssertion *g1, *g2;
1616
1617         /* count the search attrs */
1618         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1619                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1620         }
1621         /* Make a new copy of the operation */
1622         size = sizeof(Operation) + sizeof(Opheader) +
1623                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1624                 op->o_req_dn.bv_len + 1 +
1625                 op->o_req_ndn.bv_len + 1 +
1626                 op->o_ndn.bv_len + 1 +
1627                 so->s_filterstr.bv_len + 1;
1628         op2 = (Operation *)ch_calloc( 1, size );
1629         op2->o_hdr = (Opheader *)(op2+1);
1630
1631         /* Copy the fields we care about explicitly, leave the rest alone */
1632         *op2->o_hdr = *op->o_hdr;
1633         op2->o_tag = op->o_tag;
1634         op2->o_time = op->o_time;
1635         op2->o_bd = op->o_bd;
1636         op2->o_request = op->o_request;
1637
1638         if ( i ) {
1639                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1640                 ptr = (char *)(op2->ors_attrs+i+1);
1641                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1642                         op2->ors_attrs[i] = op->ors_attrs[i];
1643                         op2->ors_attrs[i].an_name.bv_val = ptr;
1644                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1645                 }
1646                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1647         } else {
1648                 ptr = (char *)(op2->o_hdr + 1);
1649         }
1650         op2->o_authz = op->o_authz;
1651         op2->o_ndn.bv_val = ptr;
1652         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1653         op2->o_dn = op2->o_ndn;
1654         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1655         op2->o_req_dn.bv_val = ptr;
1656         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1657         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1658         op2->o_req_ndn.bv_val = ptr;
1659         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1660         op2->ors_filterstr.bv_val = ptr;
1661         strcpy( ptr, so->s_filterstr.bv_val );
1662         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1663         op2->ors_filter = str2filter( ptr );
1664         so->s_op = op2;
1665
1666         /* Copy any cached group ACLs individually */
1667         op2->o_groups = NULL;
1668         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1669                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1670                 *g2 = *g1;
1671                 strcpy( g2->ga_ndn, g1->ga_ndn );
1672                 g2->ga_next = op2->o_groups;
1673                 op2->o_groups = g2;
1674         }
1675
1676         /* Add op2 to conn so abandon will find us */
1677         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1678         op->o_conn->c_n_ops_executing++;
1679         op->o_conn->c_n_ops_completed--;
1680         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1681         so->s_flags |= PS_IS_DETACHED;
1682         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1683 }
1684
1685 static int
1686 syncprov_search_response( Operation *op, SlapReply *rs )
1687 {
1688         searchstate *ss = op->o_callback->sc_private;
1689         slap_overinst *on = ss->ss_on;
1690         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1691
1692         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1693                 /* If we got a referral without a referral object, there's
1694                  * something missing that we cannot replicate. Just ignore it.
1695                  * The consumer will abort because we didn't send the expected
1696                  * control.
1697                  */
1698                 if ( !rs->sr_entry ) {
1699                         assert( rs->sr_entry != NULL );
1700                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1701                         return SLAP_CB_CONTINUE;
1702                 }
1703                 if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1704                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1705                                 slap_schema.si_ad_entryCSN );
1706
1707                         /* Don't send the ctx entry twice */
1708                         if ( a && bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1709                                 return LDAP_SUCCESS;
1710                 }
1711                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1712                         op->o_tmpmemctx );
1713                 rs->sr_ctrls[1] = NULL;
1714                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1715                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1716         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1717                 struct berval cookie;
1718
1719                 slap_compose_sync_cookie( op, &cookie,
1720                         &op->ors_filter->f_and->f_ava->aa_value,
1721                         srs->sr_state.rid );
1722
1723                 /* Is this a regular refresh? */
1724                 if ( !ss->ss_so ) {
1725                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1726                                 op->o_tmpmemctx );
1727                         rs->sr_ctrls[1] = NULL;
1728                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1729                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1730                                         LDAP_SYNC_REFRESH_DELETES );
1731                 } else {
1732                         int locked = 0;
1733                 /* It's RefreshAndPersist, transition to Persist phase */
1734                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1735                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1736                                 &cookie, 1, NULL, 0 );
1737                         /* Flush any queued persist messages */
1738                         if ( ss->ss_so->s_res ) {
1739                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1740                                 locked = 1;
1741                                 syncprov_qplay( op, on, ss->ss_so );
1742                         }
1743
1744                         /* Turn off the refreshing flag */
1745                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1746                         if ( locked )
1747                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1748
1749                         /* Detach this Op from frontend control */
1750                         syncprov_detach_op( op, ss->ss_so );
1751
1752                         return LDAP_SUCCESS;
1753                 }
1754         }
1755
1756         return SLAP_CB_CONTINUE;
1757 }
1758
1759 static int
1760 syncprov_op_search( Operation *op, SlapReply *rs )
1761 {
1762         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1763         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1764         slap_callback   *cb;
1765         int gotstate = 0, nochange = 0, do_present = 1;
1766         Filter *fand, *fava;
1767         syncops *sop = NULL;
1768         searchstate *ss;
1769         sync_control *srs;
1770         struct berval ctxcsn;
1771         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1772
1773         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1774
1775         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1776                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1777                 return rs->sr_err;
1778         }
1779
1780         srs = op->o_controls[slap_cids.sc_LDAPsync];
1781         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1782
1783         /* If this is a persistent search, set it up right away */
1784         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1785                 syncops so = {0};
1786                 fbase_cookie fc;
1787                 opcookie opc;
1788                 slap_callback sc;
1789
1790                 fc.fss = &so;
1791                 fc.fbase = 0;
1792                 so.s_eid = NOID;
1793                 so.s_op = op;
1794                 so.s_flags = PS_IS_REFRESHING;
1795                 /* syncprov_findbase expects to be called as a callback... */
1796                 sc.sc_private = &opc;
1797                 opc.son = on;
1798                 cb = op->o_callback;
1799                 op->o_callback = &sc;
1800                 rs->sr_err = syncprov_findbase( op, &fc );
1801                 op->o_callback = cb;
1802
1803                 if ( rs->sr_err != LDAP_SUCCESS ) {
1804                         send_ldap_result( op, rs );
1805                         return rs->sr_err;
1806                 }
1807                 sop = ch_malloc( sizeof( syncops ));
1808                 *sop = so;
1809                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1810                 sop->s_rid = srs->sr_state.rid;
1811                 sop->s_inuse = 1;
1812
1813                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1814                 sop->s_next = si->si_ops;
1815                 si->si_ops = sop;
1816                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1817         }
1818
1819         /* snapshot the ctxcsn */
1820         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1821         strcpy( csnbuf, si->si_ctxcsnbuf );
1822         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1823         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1824         ctxcsn.bv_val = csnbuf;
1825
1826         /* If we have a cookie, handle the PRESENT lookups */
1827         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1828                 sessionlog *sl;
1829
1830                 /* The cookie was validated when it was parsed, just use it */
1831
1832                 /* If just Refreshing and nothing has changed, shortcut it */
1833                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1834                         nochange = 1;
1835                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1836                                 LDAPControl     *ctrls[2];
1837
1838                                 ctrls[0] = NULL;
1839                                 ctrls[1] = NULL;
1840                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1841                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1842                                 rs->sr_ctrls = ctrls;
1843                                 rs->sr_err = LDAP_SUCCESS;
1844                                 send_ldap_result( op, rs );
1845                                 rs->sr_ctrls = NULL;
1846                                 return rs->sr_err;
1847                         }
1848                         goto shortcut;
1849                 }
1850                 /* Do we have a sessionlog for this search? */
1851                 sl=si->si_logs;
1852                 if ( sl ) {
1853                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1854                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1855                                 do_present = 0;
1856                                 /* mutex is unlocked in playlog */
1857                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1858                         } else {
1859                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1860                         }
1861                 }
1862                 /* Is the CSN still present in the database? */
1863                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1864                         /* No, so a reload is required */
1865 #if 0           /* the consumer doesn't seem to send this hint */
1866                         if ( op->o_sync_rhint == 0 ) {
1867                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1868                                 return rs->sr_err;
1869                         }
1870 #endif
1871                 } else {
1872                         gotstate = 1;
1873                         /* If changed and doing Present lookup, send Present UUIDs */
1874                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1875                                 LDAP_SUCCESS ) {
1876                                 send_ldap_result( op, rs );
1877                                 return rs->sr_err;
1878                         }
1879                 }
1880         }
1881
1882 shortcut:
1883         /* Append CSN range to search filter, save original filter
1884          * for persistent search evaluation
1885          */
1886         if ( sop ) {
1887                 sop->s_filterstr= op->ors_filterstr;
1888         }
1889
1890         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1891         fand->f_choice = LDAP_FILTER_AND;
1892         fand->f_next = NULL;
1893         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1894         fava->f_choice = LDAP_FILTER_LE;
1895         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1896         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1897 #ifdef LDAP_COMP_MATCH
1898         fava->f_ava->aa_cf = NULL;
1899 #endif
1900         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1901         fand->f_and = fava;
1902         if ( gotstate ) {
1903                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1904                 fava = fava->f_next;
1905                 fava->f_choice = LDAP_FILTER_GE;
1906                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1907                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1908 #ifdef LDAP_COMP_MATCH
1909                 fava->f_ava->aa_cf = NULL;
1910 #endif
1911                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1912         }
1913         fava->f_next = op->ors_filter;
1914         op->ors_filter = fand;
1915         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1916
1917         /* Let our callback add needed info to returned entries */
1918         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1919         ss = (searchstate *)(cb+1);
1920         ss->ss_on = on;
1921         ss->ss_so = sop;
1922         ss->ss_present = do_present;
1923         cb->sc_response = syncprov_search_response;
1924         cb->sc_cleanup = syncprov_search_cleanup;
1925         cb->sc_private = ss;
1926         cb->sc_next = op->o_callback;
1927         op->o_callback = cb;
1928
1929 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1930         op->o_sync_mode &= SLAP_CONTROL_MASK;
1931 #endif
1932
1933         /* If this is a persistent search and no changes were reported during
1934          * the refresh phase, just invoke the response callback to transition
1935          * us into persist phase
1936          */
1937         if ( nochange ) {
1938                 rs->sr_err = LDAP_SUCCESS;
1939                 rs->sr_nentries = 0;
1940                 send_ldap_result( op, rs );
1941                 return rs->sr_err;
1942         }
1943         return SLAP_CB_CONTINUE;
1944 }
1945
1946 static int
1947 syncprov_operational(
1948         Operation *op,
1949         SlapReply *rs )
1950 {
1951         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1952         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1953
1954         if ( rs->sr_entry &&
1955                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1956
1957                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1958                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1959                         Attribute *a, **ap = NULL;
1960
1961                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1962                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1963                                         break;
1964                         }
1965
1966                         if ( !a ) {
1967                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1968
1969                                 a = ch_malloc( sizeof(Attribute));
1970                                 a->a_desc = slap_schema.si_ad_contextCSN;
1971                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1972                                 a->a_vals[1].bv_val = NULL;
1973                                 a->a_nvals = a->a_vals;
1974                                 a->a_next = NULL;
1975                                 a->a_flags = 0;
1976                                 *ap = a;
1977                         }
1978
1979                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1980                         if ( !ap ) {
1981                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1982                         } else {
1983                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1984                         }
1985                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1986                 }
1987         }
1988         return SLAP_CB_CONTINUE;
1989 }
1990
1991 enum {
1992         SP_CHKPT = 1,
1993         SP_SESSL
1994 };
1995
1996 static ConfigDriver sp_cf_gen;
1997
1998 static ConfigTable spcfg[] = {
1999         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2000                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2001                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2002                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2003         { "syncprov-sessionlog", "size", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2004                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2005                         "DESC 'Session log size in ops' "
2006                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2007         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2008 };
2009
2010 static ConfigOCs spocs[] = {
2011         { "( OLcfgOvOc:1.1 "
2012                 "NAME 'olcSyncProvConfig' "
2013                 "DESC 'SyncRepl Provider configuration' "
2014                 "SUP olcOverlayConfig "
2015                 "MAY ( olcSpCheckpoint $ olcSpSessionlog ) )",
2016                         Cft_Overlay, spcfg },
2017         { NULL, 0, NULL }
2018 };
2019
2020 static int
2021 sp_cf_gen(ConfigArgs *c)
2022 {
2023         slap_overinst           *on = (slap_overinst *)c->bi;
2024         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2025         int rc = 0;
2026
2027         if ( c->op == SLAP_CONFIG_EMIT ) {
2028                 switch ( c->type ) {
2029                 case SP_CHKPT:
2030                         if ( si->si_chkops || si->si_chktime ) {
2031                                 struct berval bv;
2032                                 bv.bv_len = sprintf( c->msg, "%d %d",
2033                                         si->si_chkops, si->si_chktime );
2034                                 bv.bv_val = c->msg;
2035                                 value_add_one( &c->rvalue_vals, &bv );
2036                         } else {
2037                                 rc = 1;
2038                         }
2039                         break;
2040                 case SP_SESSL:
2041                         if ( si->si_logs ) {
2042                                 c->value_int = si->si_logs->sl_size;
2043                         } else {
2044                                 rc = 1;
2045                         }
2046                         break;
2047                 }
2048                 return rc;
2049         } else if ( c->op == LDAP_MOD_DELETE ) {
2050                 switch ( c->type ) {
2051                 case SP_CHKPT:
2052                         si->si_chkops = 0;
2053                         si->si_chktime = 0;
2054                         break;
2055                 case SP_SESSL:
2056                         if ( si->si_logs )
2057                                 si->si_logs->sl_size = 0;
2058                         else
2059                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2060                         break;
2061                 }
2062                 return rc;
2063         }
2064         switch ( c->type ) {
2065         case SP_CHKPT:
2066                 si->si_chkops = atoi( c->argv[1] );
2067                 si->si_chktime = atoi( c->argv[2] ) * 60;
2068                 break;
2069         case SP_SESSL: {
2070                 sessionlog *sl;
2071                 int size = c->value_int;
2072
2073                 if ( size < 0 ) {
2074                         sprintf( c->msg, "%s size %d is negative",
2075                                 c->argv[0], size );
2076                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2077                         return ARG_BAD_CONF;
2078                 }
2079                 sl = si->si_logs;
2080                 if ( !sl ) {
2081                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2082                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2083                         sl->sl_mincsn.bv_len = 0;
2084                         sl->sl_num = 0;
2085                         sl->sl_head = sl->sl_tail = NULL;
2086                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2087                         si->si_logs = sl;
2088                 }
2089                 sl->sl_size = size;
2090                 }
2091                 break;
2092         }
2093         return rc;
2094 }
2095
2096 /* Cheating - we have no thread pool context for these functions,
2097  * so make one.
2098  */
2099 typedef struct thread_keys {
2100         void *key;
2101         void *data;
2102         ldap_pvt_thread_pool_keyfree_t *xfree;
2103 } thread_keys;
2104
2105 #define MAXKEYS 32
2106 /* A fake thread context */
2107 static thread_keys thrctx[MAXKEYS];
2108
2109 /* ITS#3456 we cannot run this search on the main thread, must use a
2110  * child thread in order to insure we have a big enough stack.
2111  */
2112 static void *
2113 syncprov_db_otask(
2114         void *ptr
2115 )
2116 {
2117         syncprov_findcsn( ptr, FIND_MAXCSN );
2118         return NULL;
2119 }
2120
2121 /* Read any existing contextCSN from the underlying db.
2122  * Then search for any entries newer than that. If no value exists,
2123  * just generate it. Cache whatever result.
2124  */
2125 static int
2126 syncprov_db_open(
2127     BackendDB *be
2128 )
2129 {
2130         slap_overinst   *on = (slap_overinst *) be->bd_info;
2131         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2132
2133         Connection conn;
2134         char opbuf[OPERATION_BUFFER_SIZE];
2135         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2136         Operation *op = (Operation *)opbuf;
2137         Entry *e;
2138         Attribute *a;
2139         int rc;
2140
2141         if ( slapMode & SLAP_TOOL_MODE ) {
2142                 return 0;
2143         }
2144
2145         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2146         if ( rc ) {
2147                 return rc;
2148         }
2149
2150         connection_fake_init( &conn, op, thrctx );
2151         op->o_bd = be;
2152         op->o_dn = be->be_rootdn;
2153         op->o_ndn = be->be_rootndn;
2154
2155         ctxcsnbuf[0] = '\0';
2156
2157         op->o_bd->bd_info = on->on_info->oi_orig;
2158         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2159                 slap_schema.si_ad_contextCSN, 0, &e );
2160
2161         if ( e ) {
2162                 ldap_pvt_thread_t tid;
2163
2164                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2165                 if ( a ) {
2166                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2167                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2168                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2169                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2170                                 si->si_ctxcsn.bv_len );
2171                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2172                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2173                 }
2174                 be_entry_release_rw( op, e, 0 );
2175                 op->o_bd->bd_info = (BackendInfo *)on;
2176                 op->o_req_dn = be->be_suffix[0];
2177                 op->o_req_ndn = be->be_nsuffix[0];
2178                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2179                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2180                 ldap_pvt_thread_join( tid, NULL );
2181         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2182                 /* If we're also a consumer, and we didn't find the context entry,
2183                  * then don't generate anything, wait for our provider to send it
2184                  * to us.
2185                  */
2186                 goto out;
2187         }
2188
2189         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2190                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2191                                 &si->si_ctxcsn, 0 );
2192         }
2193
2194         /* If our ctxcsn is different from what was read from the root
2195          * entry, make sure we do a checkpoint on close
2196          */
2197         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2198                 si->si_numops++;
2199         }
2200
2201 out:
2202         op->o_bd->bd_info = (BackendInfo *)on;
2203         return 0;
2204 }
2205
2206 /* Write the current contextCSN into the underlying db.
2207  */
2208 static int
2209 syncprov_db_close(
2210     BackendDB *be
2211 )
2212 {
2213     slap_overinst   *on = (slap_overinst *) be->bd_info;
2214     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2215         int i;
2216
2217         if ( slapMode & SLAP_TOOL_MODE ) {
2218                 return 0;
2219         }
2220         if ( si->si_numops ) {
2221                 Connection conn;
2222                 char opbuf[OPERATION_BUFFER_SIZE];
2223                 Operation *op = (Operation *)opbuf;
2224                 SlapReply rs = {REP_RESULT};
2225
2226                 connection_fake_init( &conn, op, thrctx );
2227                 op->o_bd = be;
2228                 op->o_dn = be->be_rootdn;
2229                 op->o_ndn = be->be_rootndn;
2230                 syncprov_checkpoint( op, &rs, on );
2231         }
2232         for ( i=0; thrctx[i].key; i++) {
2233                 if ( thrctx[i].xfree )
2234                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2235                 thrctx[i].key = NULL;
2236         }
2237
2238     return 0;
2239 }
2240
2241 static int
2242 syncprov_db_init(
2243         BackendDB *be
2244 )
2245 {
2246         slap_overinst   *on = (slap_overinst *)be->bd_info;
2247         syncprov_info_t *si;
2248
2249         si = ch_calloc(1, sizeof(syncprov_info_t));
2250         on->on_bi.bi_private = si;
2251         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2252         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2253         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2254         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2255
2256         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2257         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2258
2259         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2260         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2261
2262         return 0;
2263 }
2264
2265 static int
2266 syncprov_db_destroy(
2267         BackendDB *be
2268 )
2269 {
2270         slap_overinst   *on = (slap_overinst *)be->bd_info;
2271         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2272
2273         if ( si ) {
2274                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2275                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2276                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2277                 ch_free( si );
2278         }
2279
2280         return 0;
2281 }
2282
2283 static int syncprov_parseCtrl (
2284         Operation *op,
2285         SlapReply *rs,
2286         LDAPControl *ctrl )
2287 {
2288         ber_tag_t tag;
2289         BerElement *ber;
2290         ber_int_t mode;
2291         ber_len_t len;
2292         struct berval cookie = BER_BVNULL;
2293         sync_control *sr;
2294         int rhint = 0;
2295
2296         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2297                 rs->sr_text = "Sync control specified multiple times";
2298                 return LDAP_PROTOCOL_ERROR;
2299         }
2300
2301         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2302                 rs->sr_text = "Sync control specified with pagedResults control";
2303                 return LDAP_PROTOCOL_ERROR;
2304         }
2305
2306         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2307                 rs->sr_text = "Sync control value is empty (or absent)";
2308                 return LDAP_PROTOCOL_ERROR;
2309         }
2310
2311         /* Parse the control value
2312          *      syncRequestValue ::= SEQUENCE {
2313          *              mode   ENUMERATED {
2314          *                      -- 0 unused
2315          *                      refreshOnly             (1),
2316          *                      -- 2 reserved
2317          *                      refreshAndPersist       (3)
2318          *              },
2319          *              cookie  syncCookie OPTIONAL
2320          *      }
2321          */
2322
2323         ber = ber_init( &ctrl->ldctl_value );
2324         if( ber == NULL ) {
2325                 rs->sr_text = "internal error";
2326                 return LDAP_OTHER;
2327         }
2328
2329         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2330                 rs->sr_text = "Sync control : mode decoding error";
2331                 return LDAP_PROTOCOL_ERROR;
2332         }
2333
2334         switch( mode ) {
2335         case LDAP_SYNC_REFRESH_ONLY:
2336                 mode = SLAP_SYNC_REFRESH;
2337                 break;
2338         case LDAP_SYNC_REFRESH_AND_PERSIST:
2339                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2340                 break;
2341         default:
2342                 rs->sr_text = "Sync control : unknown update mode";
2343                 return LDAP_PROTOCOL_ERROR;
2344         }
2345
2346         tag = ber_peek_tag( ber, &len );
2347
2348         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2349                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2350                         rs->sr_text = "Sync control : cookie decoding error";
2351                         return LDAP_PROTOCOL_ERROR;
2352                 }
2353         }
2354         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2355                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2356                         rs->sr_text = "Sync control : rhint decoding error";
2357                         return LDAP_PROTOCOL_ERROR;
2358                 }
2359         }
2360         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2361                         rs->sr_text = "Sync control : decoding error";
2362                         return LDAP_PROTOCOL_ERROR;
2363         }
2364         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2365         sr->sr_rhint = rhint;
2366         if (!BER_BVISNULL(&cookie)) {
2367                 ber_dupbv( &sr->sr_state.octet_str, &cookie );
2368                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2369         }
2370
2371         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2372
2373         (void) ber_free( ber, 1 );
2374
2375         op->o_sync = ctrl->ldctl_iscritical
2376                 ? SLAP_CONTROL_CRITICAL
2377                 : SLAP_CONTROL_NONCRITICAL;
2378
2379         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2380
2381         return LDAP_SUCCESS;
2382 }
2383
2384 /* This overlay is set up for dynamic loading via moduleload. For static
2385  * configuration, you'll need to arrange for the slap_overinst to be
2386  * initialized and registered by some other function inside slapd.
2387  */
2388
2389 static slap_overinst            syncprov;
2390
2391 int
2392 syncprov_init()
2393 {
2394         int rc;
2395
2396         rc = register_supported_control( LDAP_CONTROL_SYNC,
2397                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2398                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2399         if ( rc != LDAP_SUCCESS ) {
2400                 Debug( LDAP_DEBUG_ANY,
2401                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2402                 return rc;
2403         }
2404
2405         syncprov.on_bi.bi_type = "syncprov";
2406         syncprov.on_bi.bi_db_init = syncprov_db_init;
2407         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2408         syncprov.on_bi.bi_db_open = syncprov_db_open;
2409         syncprov.on_bi.bi_db_close = syncprov_db_close;
2410
2411         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2412         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2413
2414         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2415         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2416         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2417         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2418         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2419         syncprov.on_bi.bi_op_search = syncprov_op_search;
2420         syncprov.on_bi.bi_extended = syncprov_op_extended;
2421         syncprov.on_bi.bi_operational = syncprov_operational;
2422
2423         syncprov.on_bi.bi_cf_ocs = spocs;
2424
2425         rc = config_register_schema( spcfg, spocs );
2426         if ( rc ) return rc;
2427
2428         return overlay_register( &syncprov );
2429 }
2430
2431 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2432 int
2433 init_module( int argc, char *argv[] )
2434 {
2435         return syncprov_init();
2436 }
2437 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2438
2439 #endif /* defined(SLAPD_OVER_SYNCPROV) */