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

   1 /* syncprov.c - syncrepl provider */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2004 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* ACKNOWLEDGEMENTS:
  16  * This work was initially developed by Howard Chu for inclusion in
  17  * OpenLDAP Software.
  18  */
  19
  20 #include "portable.h"
  21
  22 #ifdef SLAPD_OVER_SYNCPROV
  23
  24 #include <ac/string.h>
  25 #include "lutil.h"
  26 #include "slap.h"
  27
  28 /* A queued result of a persistent search */
  29 typedef struct syncres {
  30         struct syncres *s_next;
  31         struct berval s_dn;
  32         struct berval s_ndn;
  33         struct berval s_uuid;
  34         struct berval s_csn;
  35         char s_mode;
  36         char s_isreference;
  37 } syncres;
  38
  39 /* Record of a persistent search */
  40 typedef struct syncops {
  41         struct syncops *s_next;
  42         struct berval   s_base;         /* ndn of search base */
  43         ID              s_eid;          /* entryID of search base */
  44         Operation       *s_op;          /* search op */
  45         long    s_sid;
  46         long    s_rid;
  47         struct berval s_filterstr;
  48         int             s_flags;        /* search status */
  49         int             s_inuse;        /* reference count */
  50         struct syncres *s_res;
  51         struct syncres *s_restail;
  52         ldap_pvt_thread_mutex_t s_mutex;
  53 } syncops;
  54
  55 static int      sync_cid;
  56
  57 /* A received sync control */
  58 typedef struct sync_control {
  59         struct sync_cookie sr_state;
  60         int sr_rhint;
  61 } sync_control;
  62
  63 /* o_sync_mode uses data bits of o_sync */
  64 #define o_sync  o_ctrlflag[sync_cid]
  65 #define o_sync_mode     o_ctrlflag[sync_cid]
  66
  67 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  68 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  69 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  70 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  71
  72 #define PS_IS_REFRESHING        0x01
  73
  74 /* Record of which searches matched at premodify step */
  75 typedef struct syncmatches {
  76         struct syncmatches *sm_next;
  77         syncops *sm_op;
  78 } syncmatches;
  79
  80 typedef struct syncprov_info_t {
  81         syncops         *si_ops;
  82         struct berval   si_ctxcsn;      /* ldapsync context */
  83         int             si_gotcsn;      /* is our ctxcsn up to date? */
  84         ldap_pvt_thread_mutex_t si_csn_mutex;
  85         ldap_pvt_thread_mutex_t si_ops_mutex;
  86         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
  87 } syncprov_info_t;
  88
  89 typedef struct opcookie {
  90         slap_overinst *son;
  91         syncmatches *smatches;
  92         struct berval sdn;      /* DN of entry, for deletes */
  93         struct berval sndn;
  94         struct berval suuid;    /* UUID of entry */
  95         struct berval sctxcsn;
  96         int sreference; /* Is the entry a reference? */
  97 } opcookie;
  98
  99 typedef struct fbase_cookie {
 100         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 101         syncops *fss;   /* persistent search we're testing against */
 102         int fbase;      /* if TRUE we found the search base and it's still valid */
 103         int fscope;     /* if TRUE then fdn is within the psearch scope */
 104 } fbase_cookie;
 105
 106 static AttributeName csn_anlist[2];
 107 static AttributeName uuid_anlist[2];
 108
 109 static int
 110 syncprov_state_ctrl(
 111         Operation       *op,
 112         SlapReply       *rs,
 113         Entry           *e,
 114         int                     entry_sync_state,
 115         LDAPControl     **ctrls,
 116         int                     num_ctrls,
 117         int                     send_cookie,
 118         struct berval   *cookie)
 119 {
 120         Attribute* a;
 121         int ret;
 122         int res;
 123         const char *text = NULL;
 124
 125         BerElementBuffer berbuf;
 126         BerElement *ber = (BerElement *)&berbuf;
 127
 128         struct berval entryuuid_bv      = BER_BVNULL;
 129
 130         ber_init2( ber, 0, LBER_USE_DER );
 131         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 132
 133         ctrls[num_ctrls] = slap_sl_malloc ( sizeof ( LDAPControl ), op->o_tmpmemctx );
 134
 135         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 136                 AttributeDescription *desc = a->a_desc;
 137                 if ( desc == slap_schema.si_ad_entryUUID ) {
 138                         entryuuid_bv = a->a_nvals[0];
 139                         break;
 140                 }
 141         }
 142
 143         if ( send_cookie && cookie ) {
 144                 ber_printf( ber, "{eOON}",
 145                         entry_sync_state, &entryuuid_bv, cookie );
 146         } else {
 147                 ber_printf( ber, "{eON}",
 148                         entry_sync_state, &entryuuid_bv );
 149         }
 150
 151         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 152         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 153         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 154
 155         ber_free_buf( ber );
 156
 157         if ( ret < 0 ) {
 158                 Debug( LDAP_DEBUG_TRACE,
 159                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 160                         0, 0, 0 );
 161                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 162                 return ret;
 163         }
 164
 165         return LDAP_SUCCESS;
 166 }
 167
 168 static int
 169 syncprov_done_ctrl(
 170         Operation       *op,
 171         SlapReply       *rs,
 172         LDAPControl     **ctrls,
 173         int                     num_ctrls,
 174         int                     send_cookie,
 175         struct berval *cookie,
 176         int                     refreshDeletes )
 177 {
 178         int ret;
 179         BerElementBuffer berbuf;
 180         BerElement *ber = (BerElement *)&berbuf;
 181
 182         ber_init2( ber, NULL, LBER_USE_DER );
 183         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 184
 185         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 186
 187         ber_printf( ber, "{" );
 188         if ( send_cookie && cookie ) {
 189                 ber_printf( ber, "O", cookie );
 190         }
 191         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 192                 ber_printf( ber, "b", refreshDeletes );
 193         }
 194         ber_printf( ber, "N}" );
 195
 196         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 197         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 198         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 199
 200         ber_free_buf( ber );
 201
 202         if ( ret < 0 ) {
 203                 Debug( LDAP_DEBUG_TRACE,
 204                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 205                         0, 0, 0 );
 206                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 207                 return ret;
 208         }
 209
 210         return LDAP_SUCCESS;
 211 }
 212
 213
 214 static int
 215 syncprov_state_ctrl_from_slog(
 216         Operation       *op,
 217         SlapReply       *rs,
 218         struct slog_entry *slog_e,
 219         int                     entry_sync_state,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval   *cookie)
 224 {
 225         Attribute* a;
 226         int ret;
 227         int res;
 228         const char *text = NULL;
 229
 230         BerElementBuffer berbuf;
 231         BerElement *ber = (BerElement *)&berbuf;
 232
 233         struct berval entryuuid_bv      = BER_BVNULL;
 234
 235         ber_init2( ber, NULL, LBER_USE_DER );
 236         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 237
 238         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 239
 240         entryuuid_bv = slog_e->sl_uuid;
 241
 242         if ( send_cookie && cookie ) {
 243                 ber_printf( ber, "{eOON}",
 244                         entry_sync_state, &entryuuid_bv, cookie );
 245         } else {
 246                 ber_printf( ber, "{eON}",
 247                         entry_sync_state, &entryuuid_bv );
 248         }
 249
 250         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 251         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 252         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 253
 254         ber_free_buf( ber );
 255
 256         if ( ret < 0 ) {
 257                 Debug( LDAP_DEBUG_TRACE,
 258                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 259                         0, 0, 0 );
 260                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 261                 return ret;
 262         }
 263
 264         return LDAP_SUCCESS;
 265 }
 266
 267 static int
 268 syncprov_sendinfo(
 269         Operation       *op,
 270         SlapReply       *rs,
 271         int                     type,
 272         struct berval *cookie,
 273         int                     refreshDone,
 274         BerVarray       syncUUIDs,
 275         int                     refreshDeletes )
 276 {
 277         BerElementBuffer berbuf;
 278         BerElement *ber = (BerElement *)&berbuf;
 279         struct berval rspdata;
 280
 281         int ret;
 282
 283         ber_init2( ber, NULL, LBER_USE_DER );
 284         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 285
 286         if ( type ) {
 287                 switch ( type ) {
 288                 case LDAP_TAG_SYNC_NEW_COOKIE:
 289                         ber_printf( ber, "tO", type, cookie );
 290                         break;
 291                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 292                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 293                         ber_printf( ber, "t{", type );
 294                         if ( cookie ) {
 295                                 ber_printf( ber, "O", cookie );
 296                         }
 297                         if ( refreshDone == 0 ) {
 298                                 ber_printf( ber, "b", refreshDone );
 299                         }
 300                         ber_printf( ber, "N}" );
 301                         break;
 302                 case LDAP_TAG_SYNC_ID_SET:
 303                         ber_printf( ber, "t{", type );
 304                         if ( cookie ) {
 305                                 ber_printf( ber, "O", cookie );
 306                         }
 307                         if ( refreshDeletes == 1 ) {
 308                                 ber_printf( ber, "b", refreshDeletes );
 309                         }
 310                         ber_printf( ber, "[W]", syncUUIDs );
 311                         ber_printf( ber, "N}" );
 312                         break;
 313                 default:
 314                         Debug( LDAP_DEBUG_TRACE,
 315                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 316                                 type, 0, 0 );
 317                         return LDAP_OTHER;
 318                 }
 319         }
 320
 321         ret = ber_flatten2( ber, &rspdata, 0 );
 322
 323         if ( ret < 0 ) {
 324                 Debug( LDAP_DEBUG_TRACE,
 325                         "syncprov_sendinfo: ber_flatten2 failed\n",
 326                         0, 0, 0 );
 327                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 328                 return ret;
 329         }
 330
 331         rs->sr_rspdata = &rspdata;
 332         send_ldap_intermediate( op, rs );
 333         rs->sr_rspdata = NULL;
 334         ber_free_buf( ber );
 335
 336         return LDAP_SUCCESS;
 337 }
 338 /* syncprov_findbase:
 339  *   finds the true DN of the base of a search (with alias dereferencing) and
 340  * checks to make sure the base entry doesn't get replaced with a different
 341  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 342  * change is detected, any persistent search on this base must be terminated /
 343  * reloaded.
 344  *   On the first call, we just save the DN and entryID. On subsequent calls
 345  * we compare the DN and entryID with the saved values.
 346  */
 347 static int
 348 findbase_cb( Operation *op, SlapReply *rs )
 349 {
 350         slap_callback *sc = op->o_callback;
 351
 352         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 353                 fbase_cookie *fc = sc->sc_private;
 354
 355                 /* If no entryID, we're looking for the first time.
 356                  * Just store whatever we got.
 357                  */
 358                 if ( fc->fss->s_eid == NOID ) {
 359                         fc->fbase = 1;
 360                         fc->fss->s_eid = rs->sr_entry->e_id;
 361                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 362
 363                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 364                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 365
 366                 /* OK, the DN is the same and the entryID is the same. Now
 367                  * see if the fdn resides in the scope.
 368                  */
 369                         fc->fbase = 1;
 370                         switch ( fc->fss->s_op->ors_scope ) {
 371                         case LDAP_SCOPE_BASE:
 372                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 373                                 break;
 374                         case LDAP_SCOPE_ONELEVEL: {
 375                                 struct berval pdn;
 376                                 dnParent( fc->fdn, &pdn );
 377                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 378                                 break; }
 379                         case LDAP_SCOPE_SUBTREE:
 380                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 381                                 break;
 382 #ifdef LDAP_SCOPE_SUBORDINATE
 383                         case LDAP_SCOPE_SUBORDINATE:
 384                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 385                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 386                                 break;
 387 #endif
 388                         }
 389                 }
 390         }
 391         return LDAP_SUCCESS;
 392 }
 393
 394 static int
 395 syncprov_findbase( Operation *op, fbase_cookie *fc )
 396 {
 397         opcookie *opc = op->o_callback->sc_private;
 398         slap_overinst *on = opc->son;
 399         syncprov_info_t         *si = on->on_bi.bi_private;
 400
 401         slap_callback cb = {0};
 402         Operation fop;
 403         SlapReply frs = { REP_RESULT };
 404         int rc;
 405
 406         fop = *op;
 407
 408         cb.sc_response = findbase_cb;
 409         cb.sc_private = fc;
 410
 411         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 412         fop.o_callback = &cb;
 413         fop.o_tag = LDAP_REQ_SEARCH;
 414         fop.ors_scope = LDAP_SCOPE_BASE;
 415         fop.ors_deref = fc->fss->s_op->ors_deref;
 416         fop.ors_slimit = 1;
 417         fop.ors_tlimit = SLAP_NO_LIMIT;
 418         fop.ors_attrs = slap_anlist_no_attrs;
 419         fop.ors_attrsonly = 1;
 420         fop.ors_filter = fc->fss->s_op->ors_filter;
 421         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 422
 423         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 424
 425         fop.o_bd->bd_info = on->on_info->oi_orig;
 426         rc = fop.o_bd->be_search( &fop, &frs );
 427         fop.o_bd->bd_info = (BackendInfo *)on;
 428
 429         if ( fc->fbase ) return LDAP_SUCCESS;
 430
 431         /* If entryID has changed, then the base of this search has
 432          * changed. Invalidate the psearch.
 433          */
 434         return LDAP_NO_SUCH_OBJECT;
 435 }
 436
 437 /* syncprov_findcsn:
 438  *   This function has three different purposes, but they all use a search
 439  * that filters on entryCSN so they're combined here.
 440  * 1: when the current contextCSN is unknown (i.e., at server start time)
 441  * and a syncrepl search has arrived with a cookie, we search for all entries
 442  * with CSN >= the cookie CSN, and store the maximum as our contextCSN. Also,
 443  * we expect to find the cookie CSN in the search results, and note if we did
 444  * or not. If not, we assume the cookie is stale. (This may be too restrictive,
 445  * notice case 2.)
 446  *
 447  * 2: when the current contextCSN is known and we have a sync cookie, we search
 448  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 449  * entry is found, the cookie CSN is valid, otherwise it is stale. Case 1 is
 450  * considered a special case of case 2, and both are generally called the
 451  * "find CSN" task.
 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_CSN        1
 458 #define FIND_PRESENT    2
 459
 460 typedef struct fcsn_cookie {
 461         struct berval maxcsn;
 462         int gotmatch;
 463 } fcsn_cookie;
 464
 465 static int
 466 findcsn_cb( Operation *op, SlapReply *rs )
 467 {
 468         slap_callback *sc = op->o_callback;
 469
 470         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 471                 /* If the private pointer is set, it points to an fcsn_cookie
 472                  * and we want to record the maxcsn and match state.
 473                  */
 474                 if ( sc->sc_private ) {
 475                         int i;
 476                         fcsn_cookie *fc = sc->sc_private;
 477                         sync_control *srs = op->o_controls[sync_cid];
 478                         Attribute *a = attr_find(rs->sr_entry->e_attrs,
 479                                 slap_schema.si_ad_entryCSN );
 480                         i = ber_bvcmp( &a->a_vals[0], srs->sr_state.ctxcsn );
 481                         if ( i == 0 ) fc->gotmatch = 1;
 482                         i = ber_bvcmp( &a->a_vals[0], &fc->maxcsn );
 483                         if ( i > 0 ) {
 484                                 fc->maxcsn.bv_len = a->a_vals[0].bv_len;
 485                                 strcpy(fc->maxcsn.bv_val, a->a_vals[0].bv_val );
 486                         }
 487                 } else {
 488                 /* Otherwise, if the private pointer is not set, we just
 489                  * want to know if any entry matched the filter.
 490                  */
 491                         sc->sc_private = (void *)1;
 492                 }
 493         }
 494         return LDAP_SUCCESS;
 495 }
 496
 497 /* Build a list of entryUUIDs for sending in a SyncID set */
 498
 499 typedef struct fpres_cookie {
 500         int num;
 501         BerVarray uuids;
 502 } fpres_cookie;
 503
 504 static int
 505 findpres_cb( Operation *op, SlapReply *rs )
 506 {
 507         slap_callback *sc = op->o_callback;
 508         fpres_cookie *pc = sc->sc_private;
 509         int ret = SLAP_CB_CONTINUE;
 510
 511         if ( rs->sr_type == REP_SEARCH ) {
 512                 ret = slap_build_syncUUID_set( op, &pc->uuids, rs->sr_entry );
 513                 if ( ret > 0 ) {
 514                         pc->num++;
 515                         ret = LDAP_SUCCESS;
 516                         if ( pc->num == SLAP_SYNCUUID_SET_SIZE ) {
 517                                 rs->sr_rspoid = LDAP_SYNC_INFO;
 518                                 ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 519                                         0, pc->uuids, 0 );
 520                                 ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 521                                 pc->uuids = NULL;
 522                                 pc->num = 0;
 523                         }
 524                 } else {
 525                         ret = LDAP_OTHER;
 526                 }
 527         } else if ( rs->sr_type == REP_RESULT ) {
 528                 ret = rs->sr_err;
 529                 if ( pc->num ) {
 530                         rs->sr_rspoid = LDAP_SYNC_INFO;
 531                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 532                                 0, pc->uuids, 0 );
 533                         ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 534                         pc->uuids = NULL;
 535                         pc->num = 0;
 536                 }
 537         }
 538         return ret;
 539 }
 540
 541
 542 static int
 543 syncprov_findcsn( Operation *op, int mode )
 544 {
 545         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 546         syncprov_info_t         *si = on->on_bi.bi_private;
 547
 548         slap_callback cb = {0};
 549         Operation fop;
 550         SlapReply frs = { REP_RESULT };
 551         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 552         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 553         struct berval fbuf;
 554         Filter cf;
 555         AttributeAssertion eq;
 556         int rc;
 557         fcsn_cookie fcookie;
 558         fpres_cookie pcookie;
 559         int locked = 0;
 560         sync_control *srs = op->o_controls[sync_cid];
 561
 562         if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 563                 return LDAP_OTHER;
 564         }
 565
 566         fop = *op;
 567         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 568
 569         fbuf.bv_val = buf;
 570         if ( mode == FIND_CSN ) {
 571                 if ( !si->si_gotcsn ) {
 572                         /* If we don't know the current ctxcsn, find it */
 573                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
 574                         locked = 1;
 575                 }
 576                 if ( !si->si_gotcsn ) {
 577                         cf.f_choice = LDAP_FILTER_GE;
 578                         fop.ors_attrsonly = 0;
 579                         fop.ors_attrs = csn_anlist;
 580                         fop.ors_slimit = SLAP_NO_LIMIT;
 581                         cb.sc_private = &fcookie;
 582                         fcookie.maxcsn.bv_val = cbuf;
 583                         fcookie.maxcsn.bv_len = 0;
 584                         fcookie.gotmatch = 0;
 585                         fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)", srs->sr_state.ctxcsn->bv_val );
 586                 } else {
 587                         if ( locked ) {
 588                                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
 589                                 locked = 0;
 590                         }
 591                         cf.f_choice = LDAP_FILTER_LE;
 592                         fop.ors_attrsonly = 1;
 593                         fop.ors_attrs = slap_anlist_no_attrs;
 594                         fop.ors_slimit = 1;
 595                         cb.sc_private = NULL;
 596                         fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)", srs->sr_state.ctxcsn->bv_val );
 597                 }
 598                 cb.sc_response = findcsn_cb;
 599
 600         } else if ( mode == FIND_PRESENT ) {
 601                 cf.f_choice = LDAP_FILTER_LE;
 602                 fop.ors_attrsonly = 0;
 603                 fop.ors_attrs = uuid_anlist;
 604                 fop.ors_slimit = SLAP_NO_LIMIT;
 605                 /* We want pure entries, not referrals */
 606                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 607                 cb.sc_private = &pcookie;
 608                 cb.sc_response = findpres_cb;
 609                 pcookie.num = 0;
 610                 pcookie.uuids = NULL;
 611                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)", srs->sr_state.ctxcsn->bv_val );
 612         }
 613         cf.f_ava = &eq;
 614         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 615         cf.f_av_value = *srs->sr_state.ctxcsn;
 616         cf.f_next = NULL;
 617
 618         fop.o_callback = &cb;
 619         fop.ors_tlimit = SLAP_NO_LIMIT;
 620         fop.ors_filter = &cf;
 621         fop.ors_filterstr = fbuf;
 622
 623         fop.o_bd->bd_info = on->on_info->oi_orig;
 624         rc = fop.o_bd->be_search( &fop, &frs );
 625         fop.o_bd->bd_info = (BackendInfo *)on;
 626
 627         if ( mode == FIND_CSN ) {
 628                 if ( !si->si_gotcsn ) {
 629                         strcpy(si->si_ctxcsnbuf, fcookie.maxcsn.bv_val);
 630                         si->si_ctxcsn.bv_len = fcookie.maxcsn.bv_len;
 631                         si->si_gotcsn = 1;
 632                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
 633                         if ( fcookie.gotmatch ) return LDAP_SUCCESS;
 634
 635                 } else {
 636                         if ( cb.sc_private ) return LDAP_SUCCESS;
 637                 }
 638         } else if ( mode == FIND_PRESENT ) {
 639                 return LDAP_SUCCESS;
 640         }
 641
 642         /* If matching CSN was not found, invalidate the context. */
 643         return LDAP_NO_SUCH_OBJECT;
 644 }
 645
 646 /* Queue a persistent search response if still in Refresh stage */
 647 static int
 648 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 649 {
 650         syncres *sr;
 651
 652         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 653                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 654         sr->s_next = NULL;
 655         sr->s_dn.bv_val = (char *)(sr + 1);
 656         sr->s_mode = mode;
 657         sr->s_isreference = opc->sreference;
 658         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 659         *(sr->s_ndn.bv_val++) = '\0';
 660         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 661         *(sr->s_uuid.bv_val++) = '\0';
 662         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 663
 664         if ( !so->s_res ) {
 665                 so->s_res = sr;
 666         } else {
 667                 so->s_restail->s_next = sr;
 668         }
 669         so->s_restail = sr;
 670         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 671         return LDAP_SUCCESS;
 672 }
 673
 674 /* Send a persistent search response */
 675 static int
 676 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 677 {
 678         slap_overinst *on = opc->son;
 679         syncprov_info_t *si = on->on_bi.bi_private;
 680
 681         SlapReply rs = { REP_SEARCH };
 682         LDAPControl *ctrls[2];
 683         struct berval cookie;
 684         Entry e_uuid = {0};
 685         Attribute a_uuid = {0};
 686         Operation sop = *so->s_op;
 687         Opheader ohdr;
 688
 689         ohdr = *sop.o_hdr;
 690         sop.o_hdr = &ohdr;
 691         sop.o_tmpmemctx = op->o_tmpmemctx;
 692         sop.o_bd = op->o_bd;
 693         sop.o_controls = op->o_controls;
 694
 695         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 696                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 697                 if ( so->s_flags & PS_IS_REFRESHING )
 698                         return syncprov_qresp( opc, so, mode );
 699                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 700         }
 701
 702         ctrls[1] = NULL;
 703         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn,
 704                 so->s_sid, so->s_rid );
 705
 706         e_uuid.e_attrs = &a_uuid;
 707         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 708         a_uuid.a_nvals = &opc->suuid;
 709         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 710                 mode, ctrls, 0, 1, &cookie );
 711
 712         rs.sr_entry = e;
 713         rs.sr_ctrls = ctrls;
 714         switch( mode ) {
 715         case LDAP_SYNC_ADD:
 716                 if ( opc->sreference ) {
 717                         rs.sr_ref = get_entry_referrals( &sop, e );
 718                         send_search_reference( &sop, &rs );
 719                         ber_bvarray_free( rs.sr_ref );
 720                         break;
 721                 }
 722                 /* fallthru */
 723         case LDAP_SYNC_MODIFY:
 724                 rs.sr_attrs = sop.ors_attrs;
 725                 send_search_entry( &sop, &rs );
 726                 break;
 727         case LDAP_SYNC_DELETE:
 728                 e_uuid.e_attrs = NULL;
 729                 e_uuid.e_name = opc->sdn;
 730                 e_uuid.e_nname = opc->sndn;
 731                 rs.sr_entry = &e_uuid;
 732                 if ( opc->sreference ) {
 733                         struct berval bv;
 734                         bv.bv_val = NULL;
 735                         bv.bv_len = 0;
 736                         rs.sr_ref = &bv;
 737                         send_search_reference( &sop, &rs );
 738                 } else {
 739                         send_search_entry( &sop, &rs );
 740                 }
 741                 break;
 742         default:
 743                 assert(0);
 744         }
 745         free( rs.sr_ctrls[0] );
 746         return rs.sr_err;
 747 }
 748
 749 static void
 750 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 751 {
 752         slap_overinst *on = opc->son;
 753         syncprov_info_t         *si = on->on_bi.bi_private;
 754
 755         fbase_cookie fc;
 756         syncops *ss;
 757         Entry *e;
 758         Attribute *a;
 759         int rc;
 760         struct berval newdn;
 761
 762         fc.fdn = &op->o_req_ndn;
 763         /* compute new DN */
 764         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 765                 struct berval pdn;
 766                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 767                 else dnParent( fc.fdn, &pdn );
 768                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 769                 fc.fdn = &newdn;
 770         }
 771         if ( op->o_tag != LDAP_REQ_ADD ) {
 772                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 773                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 774                 op->o_bd->bd_info = (BackendInfo *)on;
 775                 if ( rc ) return;
 776         } else {
 777                 e = op->ora_e;
 778         }
 779
 780         if ( saveit ) {
 781                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 782                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 783                 opc->sreference = is_entry_referral( e );
 784         }
 785         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 786                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 787                 if ( a )
 788                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 789         }
 790
 791         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 792         for (ss = si->si_ops; ss; ss=ss->s_next)
 793         {
 794                 syncmatches *sm;
 795                 int found = 0;
 796
 797                 /* validate base */
 798                 fc.fss = ss;
 799                 fc.fbase = 0;
 800                 fc.fscope = 0;
 801                 rc = syncprov_findbase( op, &fc );
 802                 if ( rc != LDAP_SUCCESS ) continue;
 803
 804                 /* If we're sending results now, look for this op in old matches */
 805                 if ( !saveit ) {
 806                         syncmatches *old;
 807                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 808                                 old=sm, sm=sm->sm_next ) {
 809                                 if ( sm->sm_op == ss ) {
 810                                         found = 1;
 811                                         old->sm_next = sm->sm_next;
 812                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 813                                         break;
 814                                 }
 815                         }
 816                 }
 817
 818                 /* check if current o_req_dn is in scope and matches filter */
 819                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 820                         LDAP_COMPARE_TRUE ) {
 821                         if ( saveit ) {
 822                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 823                                 sm->sm_next = opc->smatches;
 824                                 sm->sm_op = ss;
 825                                 ss->s_inuse++;
 826                                 opc->smatches = sm;
 827                         } else {
 828                                 /* if found send UPDATE else send ADD */
 829                                 syncprov_sendresp( op, opc, ss, e,
 830                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
 831                         }
 832                 } else if ( !saveit && found ) {
 833                         /* send DELETE */
 834                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
 835                 }
 836         }
 837         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 838         if ( op->o_tag != LDAP_REQ_ADD ) {
 839                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 840                 be_entry_release_r( op, e );
 841                 op->o_bd->bd_info = (BackendInfo *)on;
 842         }
 843 }
 844
 845 static void
 846 syncprov_free_syncop( syncops *so )
 847 {
 848         syncres *sr, *srnext;
 849
 850         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 851         so->s_inuse--;
 852         if ( so->s_inuse > 0 ) {
 853                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 854                 return;
 855         }
 856         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 857         filter_free( so->s_op->ors_filter );
 858         ch_free( so->s_op );
 859         ch_free( so->s_base.bv_val );
 860         for ( sr=so->s_res; sr; sr=srnext ) {
 861                 srnext = sr->s_next;
 862                 ch_free( sr );
 863         }
 864         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 865         ch_free( so );
 866 }
 867
 868 static int
 869 syncprov_op_cleanup( Operation *op, SlapReply *rs )
 870 {
 871         slap_callback *cb = op->o_callback;
 872         opcookie *opc = cb->sc_private;
 873         syncmatches *sm, *snext;
 874
 875         for (sm = opc->smatches; sm; sm=snext) {
 876                 snext = sm->sm_next;
 877                 syncprov_free_syncop( sm->sm_op );
 878                 op->o_tmpfree( sm, op->o_tmpmemctx );
 879         }
 880         op->o_callback = cb->sc_next;
 881         op->o_tmpfree(cb, op->o_tmpmemctx);
 882 }
 883
 884 static int
 885 syncprov_op_response( Operation *op, SlapReply *rs )
 886 {
 887         opcookie *opc = op->o_callback->sc_private;
 888         slap_overinst *on = opc->son;
 889         syncprov_info_t         *si = on->on_bi.bi_private;
 890         syncmatches *sm;
 891
 892         if ( rs->sr_err == LDAP_SUCCESS )
 893         {
 894                 struct berval maxcsn;
 895                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 896
 897                 cbuf[0] = '\0';
 898                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
 899                 slap_get_commit_csn( op, &maxcsn );
 900                 if ( maxcsn.bv_val ) {
 901                         strcpy( cbuf, maxcsn.bv_val );
 902                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
 903                                 strcpy( si->si_ctxcsnbuf, cbuf );
 904                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 905                         }
 906                         si->si_gotcsn = 1;
 907                 }
 908                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
 909
 910                 opc->sctxcsn.bv_len = maxcsn.bv_len;
 911                 opc->sctxcsn.bv_val = cbuf;
 912
 913                 if ( si->si_ops ) {
 914                         switch(op->o_tag) {
 915                         case LDAP_REQ_ADD:
 916                         case LDAP_REQ_MODIFY:
 917                         case LDAP_REQ_MODRDN:
 918                         case LDAP_REQ_EXTENDED:
 919                                 syncprov_matchops( op, opc, 0 );
 920                                 break;
 921                         case LDAP_REQ_DELETE:
 922                                 /* for each match in opc->smatches:
 923                                  *   send DELETE msg
 924                                  */
 925                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 926                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
 927                                         if ( sm->sm_op->s_op->o_abandon )
 928                                                 continue;
 929                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
 930                                                 LDAP_SYNC_DELETE, 1 );
 931                                 }
 932                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 933                                 break;
 934                         }
 935                 }
 936
 937         }
 938         return SLAP_CB_CONTINUE;
 939 }
 940
 941 static int
 942 syncprov_op_abandon( Operation *op, SlapReply *rs )
 943 {
 944         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 945         syncprov_info_t         *si = on->on_bi.bi_private;
 946         syncops *so, *soprev;
 947
 948         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 949         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 950                 soprev=so, so=so->s_next ) {
 951                 if ( so->s_op->o_connid == op->o_connid &&
 952                         so->s_op->o_msgid == op->orn_msgid ) {
 953                                 so->s_op->o_abandon = 1;
 954                                 soprev->s_next = so->s_next;
 955                                 break;
 956                 }
 957         }
 958         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 959         if ( so ) {
 960                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 961                 op->o_conn->c_n_ops_executing--;
 962                 op->o_conn->c_n_ops_completed++;
 963                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 964                 /* Is this really a Cancel exop? */
 965                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 966                         rs->sr_err = LDAP_CANCELLED;
 967                         send_ldap_result( so->s_op, rs );
 968                 }
 969                 syncprov_free_syncop( so );
 970         }
 971         return SLAP_CB_CONTINUE;
 972 }
 973
 974 #if 0
 975 static int
 976 syncprov_op_compare( Operation *op, SlapReply *rs )
 977 {
 978         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 979         syncprov_info_t         *si = on->on_bi.bi_private;
 980         int rc = SLAP_CB_CONTINUE;
 981
 982         if ( dn_match( &op->o_req_ndn, &si->si_e->e_nname ) )
 983         {
 984                 Attribute *a;
 985
 986                 ldap_pvt_thread_mutex_lock( &si->si_e_mutex );
 987
 988                 if ( get_assert( op ) &&
 989                         ( test_filter( op, si->si_e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
 990                 {
 991                         rs->sr_err = LDAP_ASSERTION_FAILED;
 992                         goto return_results;
 993                 }
 994
 995                 rs->sr_err = access_allowed( op, si->si_e, op->oq_compare.rs_ava->aa_desc,
 996                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
 997                 if ( ! rs->sr_err ) {
 998                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
 999                         goto return_results;
1000                 }
1001
1002                 rs->sr_err = LDAP_NO_SUCH_ATTRIBUTE;
1003
1004                 for ( a = attr_find( si->si_e->e_attrs, op->oq_compare.rs_ava->aa_desc );
1005                         a != NULL;
1006                         a = attr_find( a->a_next, op->oq_compare.rs_ava->aa_desc ) )
1007                 {
1008                         rs->sr_err = LDAP_COMPARE_FALSE;
1009
1010                         if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1011                                 SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1012                                         SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1013                                 a->a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1014                         {
1015                                 rs->sr_err = LDAP_COMPARE_TRUE;
1016                                 break;
1017                         }
1018                 }
1019
1020 return_results:;
1021
1022                 ldap_pvt_thread_mutex_unlock( &si->si_e_mutex );
1023
1024                 send_ldap_result( op, rs );
1025
1026                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1027                         rs->sr_err = LDAP_SUCCESS;
1028                 }
1029                 rc = rs->sr_err;
1030         }
1031
1032         return SLAP_CB_CONTINUE;
1033 }
1034 #endif
1035
1036 static int
1037 syncprov_op_mod( Operation *op, SlapReply *rs )
1038 {
1039         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1040         syncprov_info_t         *si = on->on_bi.bi_private;
1041
1042         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(opcookie), op->o_tmpmemctx);
1043         opcookie *opc = (opcookie *)(cb+1);
1044         opc->son = on;
1045         cb->sc_response = syncprov_op_response;
1046         cb->sc_cleanup = syncprov_op_cleanup;
1047         cb->sc_private = opc;
1048         cb->sc_next = op->o_callback;
1049         op->o_callback = cb;
1050
1051         if ( si->si_ops && op->o_tag != LDAP_REQ_ADD )
1052                 syncprov_matchops( op, opc, 1 );
1053
1054         return SLAP_CB_CONTINUE;
1055 }
1056
1057 static int
1058 syncprov_op_extended( Operation *op, SlapReply *rs )
1059 {
1060         if ( exop_is_write( op ))
1061                 return syncprov_op_mod( op, rs );
1062
1063         return SLAP_CB_CONTINUE;
1064 }
1065
1066 typedef struct searchstate {
1067         slap_overinst *ss_on;
1068         syncops *ss_so;
1069 } searchstate;
1070
1071 static int
1072 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1073 {
1074         searchstate *ss = op->o_callback->sc_private;
1075         if ( rs->sr_ctrls ) {
1076                 free( rs->sr_ctrls[0] );
1077                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1078         }
1079         return 0;
1080 }
1081
1082 static void
1083 syncprov_detach_op( Operation *op, syncops *so )
1084 {
1085         Operation *op2;
1086         int i, alen = 0;
1087         size_t size;
1088         char *ptr;
1089
1090         /* count the search attrs */
1091         for (i=0; op->ors_attrs && op->ors_attrs[i].an_name.bv_val; i++) {
1092                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1093         }
1094         /* Make a new copy of the operation */
1095         size = sizeof(Operation) + sizeof(Opheader) +
1096                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1097                 op->o_req_dn.bv_len + 1 +
1098                 op->o_req_ndn.bv_len + 1 +
1099                 op->o_ndn.bv_len + 1 +
1100                 so->s_filterstr.bv_len + 1;
1101         op2 = (Operation *)ch_malloc( size );
1102         *op2 = *op;
1103         op2->o_hdr = (Opheader *)(op2+1);
1104         *op2->o_hdr = *op->o_hdr;
1105         if ( i ) {
1106                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1107                 ptr = (char *)(op2->ors_attrs+i+1);
1108                 for (i=0; op->ors_attrs[i].an_name.bv_val; i++) {
1109                         op2->ors_attrs[i] = op->ors_attrs[i];
1110                         op2->ors_attrs[i].an_name.bv_val = ptr;
1111                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1112                 }
1113                 op2->ors_attrs[i].an_name.bv_val = NULL;
1114                 op2->ors_attrs[i].an_name.bv_len = 0;
1115         } else {
1116                 ptr = (char *)(op2->o_hdr + 1);
1117         }
1118         op2->o_ndn.bv_val = ptr;
1119         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1120         op2->o_dn = op2->o_ndn;
1121         op2->o_req_dn.bv_val = ptr;
1122         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1123         op2->o_req_ndn.bv_val = ptr;
1124         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1125         op2->ors_filterstr.bv_val = ptr;
1126         strcpy( ptr, so->s_filterstr.bv_val );
1127         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1128         op2->ors_filter = str2filter( ptr );
1129         op2->o_controls = NULL;
1130         op2->o_callback = NULL;
1131         so->s_op = op2;
1132
1133         /* Increment number of ops so that idletimeout ignores us */
1134         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1135         op->o_conn->c_n_ops_executing++;
1136         op->o_conn->c_n_ops_completed--;
1137         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1138 }
1139
1140 static int
1141 syncprov_search_response( Operation *op, SlapReply *rs )
1142 {
1143         searchstate *ss = op->o_callback->sc_private;
1144         slap_overinst *on = ss->ss_on;
1145         syncprov_info_t         *si = on->on_bi.bi_private;
1146         sync_control *srs = op->o_controls[sync_cid];
1147
1148         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1149                 int i;
1150                 if ( srs->sr_state.ctxcsn ) {
1151                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1152                                 slap_schema.si_ad_entryCSN );
1153                         /* Don't send the ctx entry twice */
1154                         if ( bvmatch( &a->a_nvals[0], srs->sr_state.ctxcsn ))
1155                                 return LDAP_SUCCESS;
1156                 }
1157                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1158                         op->o_tmpmemctx );
1159                 rs->sr_ctrls[1] = NULL;
1160                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1161                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1162         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1163                 struct berval cookie;
1164
1165                 slap_compose_sync_cookie( op, &cookie,
1166                         &op->ors_filter->f_and->f_ava->aa_value,
1167                         srs->sr_state.sid, srs->sr_state.rid );
1168
1169                 /* Is this a regular refresh? */
1170                 if ( !ss->ss_so ) {
1171                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1172                                 op->o_tmpmemctx );
1173                         rs->sr_ctrls[1] = NULL;
1174                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1175                                 0, 1, &cookie, LDAP_SYNC_REFRESH_PRESENTS );
1176                 } else {
1177                         int locked = 0;
1178                 /* It's RefreshAndPersist, transition to Persist phase */
1179                         rs->sr_rspoid = LDAP_SYNC_INFO;
1180                         syncprov_sendinfo( op, rs, rs->sr_nentries ?
1181                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1182                                 &cookie, 1, NULL, 0 );
1183                         /* Flush any queued persist messages */
1184                         if ( ss->ss_so->s_res ) {
1185                                 syncres *sr, *srnext;
1186                                 Entry *e;
1187                                 opcookie opc;
1188
1189                                 opc.son = on;
1190                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1191                                 locked = 1;
1192                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1193                                         int rc = LDAP_SUCCESS;
1194                                         srnext = sr->s_next;
1195                                         opc.sdn = sr->s_dn;
1196                                         opc.sndn = sr->s_ndn;
1197                                         opc.suuid = sr->s_uuid;
1198                                         opc.sctxcsn = sr->s_csn;
1199                                         opc.sreference = sr->s_isreference;
1200                                         e = NULL;
1201
1202                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1203                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1204                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1205                                                 op->o_bd->bd_info = (BackendInfo *)on;
1206                                         }
1207                                         if ( rc == LDAP_SUCCESS )
1208                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1209                                                         sr->s_mode, 0 );
1210
1211                                         if ( e ) {
1212                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1213                                                 be_entry_release_r( op, e );
1214                                                 op->o_bd->bd_info = (BackendInfo *)on;
1215                                         }
1216                                         ch_free( sr );
1217                                 }
1218                                 ss->ss_so->s_res = NULL;
1219                                 ss->ss_so->s_restail = NULL;
1220                         }
1221
1222                         /* Turn off the refreshing flag */
1223                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1224                         if ( locked )
1225                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1226
1227                         /* Detach this Op from frontend control */
1228                         syncprov_detach_op( op, ss->ss_so );
1229
1230                         return LDAP_SUCCESS;
1231                 }
1232         }
1233
1234         return SLAP_CB_CONTINUE;
1235 }
1236
1237 static int
1238 syncprov_op_search( Operation *op, SlapReply *rs )
1239 {
1240         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1241         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1242         slap_callback   *cb;
1243         int gotstate = 0, nochange = 0;
1244         Filter *fand, *fava;
1245         syncops *sop = NULL;
1246         searchstate *ss;
1247         sync_control *srs;
1248
1249         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1250
1251         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1252                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1253                 return rs->sr_err;
1254         }
1255
1256         srs = op->o_controls[sync_cid];
1257
1258         /* If this is a persistent search, set it up right away */
1259         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1260                 syncops so = {0};
1261                 fbase_cookie fc;
1262                 opcookie opc;
1263                 slap_callback sc;
1264
1265                 fc.fss = &so;
1266                 fc.fbase = 0;
1267                 so.s_eid = NOID;
1268                 so.s_op = op;
1269                 so.s_flags = PS_IS_REFRESHING;
1270                 /* syncprov_findbase expects to be called as a callback... */
1271                 sc.sc_private = &opc;
1272                 opc.son = on;
1273                 cb = op->o_callback;
1274                 op->o_callback = &sc;
1275                 rs->sr_err = syncprov_findbase( op, &fc );
1276                 op->o_callback = cb;
1277
1278                 if ( rs->sr_err != LDAP_SUCCESS ) {
1279                         send_ldap_result( op, rs );
1280                         return rs->sr_err;
1281                 }
1282                 sop = ch_malloc( sizeof( syncops ));
1283                 *sop = so;
1284                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1285                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1286                 sop->s_sid = srs->sr_state.sid;
1287                 sop->s_rid = srs->sr_state.rid;
1288                 sop->s_next = si->si_ops;
1289                 sop->s_inuse = 1;
1290                 si->si_ops = sop;
1291                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1292         }
1293
1294         /* If we have a cookie, handle the PRESENT lookups
1295          */
1296         if ( srs->sr_state.ctxcsn ) {
1297                 /* Is the CSN in a valid format? */
1298                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
1299                         send_ldap_error( op, rs, LDAP_OTHER, "invalid sync cookie" );
1300                         return rs->sr_err;
1301                 }
1302                 /* Is the CSN still present in the database? */
1303                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1304                         /* No, so a reload is required */
1305 #if 0           /* the consumer doesn't seem to send this hint */
1306                         if ( op->o_sync_rhint == 0 ) {
1307                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1308                                 return rs->sr_err;
1309                         }
1310 #endif
1311                 } else {
1312                         gotstate = 1;
1313                         /* If just Refreshing and nothing has changed, shortcut it */
1314                         if ( bvmatch( srs->sr_state.ctxcsn, &si->si_ctxcsn )) {
1315                                 nochange = 1;
1316                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1317                                         LDAPControl     *ctrls[2];
1318
1319                                         ctrls[0] = NULL;
1320                                         ctrls[1] = NULL;
1321                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1322                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
1323                                         rs->sr_ctrls = ctrls;
1324                                         rs->sr_err = LDAP_SUCCESS;
1325                                         send_ldap_result( op, rs );
1326                                         return rs->sr_err;
1327                                 }
1328                                 goto shortcut;
1329                         } else
1330                         /* If context has changed, check for Present UUIDs */
1331                         if ( syncprov_findcsn( op, FIND_PRESENT ) != LDAP_SUCCESS ) {
1332                                 send_ldap_result( op, rs );
1333                                 return rs->sr_err;
1334                         }
1335                 }
1336         }
1337
1338         /* If we didn't get a cookie and we don't know our contextcsn, try to
1339          * find it anyway.
1340          */
1341         if ( !gotstate && !si->si_gotcsn ) {
1342                 struct berval bv = BER_BVC("1"), *old;
1343
1344                 old = srs->sr_state.ctxcsn;
1345                 srs->sr_state.ctxcsn = &bv;
1346                 syncprov_findcsn( op, FIND_CSN );
1347                 srs->sr_state.ctxcsn = old;
1348         }
1349
1350         /* Append CSN range to search filter, save original filter
1351          * for persistent search evaluation
1352          */
1353         if ( sop ) {
1354                 sop->s_filterstr= op->ors_filterstr;
1355         }
1356
1357         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1358         fand->f_choice = LDAP_FILTER_AND;
1359         fand->f_next = NULL;
1360         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1361         fava->f_choice = LDAP_FILTER_LE;
1362         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1363         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1364         ber_dupbv_x( &fava->f_ava->aa_value, &si->si_ctxcsn, op->o_tmpmemctx );
1365         fand->f_and = fava;
1366         if ( gotstate ) {
1367                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1368                 fava = fava->f_next;
1369                 fava->f_choice = LDAP_FILTER_GE;
1370                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1371                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1372                 ber_dupbv_x( &fava->f_ava->aa_value, srs->sr_state.ctxcsn, op->o_tmpmemctx );
1373         }
1374         fava->f_next = op->ors_filter;
1375         op->ors_filter = fand;
1376         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1377
1378 shortcut:
1379         /* Let our callback add needed info to returned entries */
1380         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1381         ss = (searchstate *)(cb+1);
1382         ss->ss_on = on;
1383         ss->ss_so = sop;
1384         cb->sc_response = syncprov_search_response;
1385         cb->sc_cleanup = syncprov_search_cleanup;
1386         cb->sc_private = ss;
1387         cb->sc_next = op->o_callback;
1388         op->o_callback = cb;
1389
1390         op->o_sync_mode &= SLAP_CONTROL_MASK;
1391
1392         /* If this is a persistent search and no changes were reported during
1393          * the refresh phase, just invoke the response callback to transition
1394          * us into persist phase
1395          */
1396         if ( nochange ) {
1397                 rs->sr_err = LDAP_SUCCESS;
1398                 rs->sr_nentries = 0;
1399                 send_ldap_result( op, rs );
1400                 return rs->sr_err;
1401         }
1402         return SLAP_CB_CONTINUE;
1403 }
1404
1405 static int
1406 syncprov_db_config(
1407         BackendDB       *be,
1408         const char      *fname,
1409         int             lineno,
1410         int             argc,
1411         char    **argv
1412 )
1413 {
1414         slap_overinst           *on = (slap_overinst *)be->bd_info;
1415         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1416
1417 #if 0
1418         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1419                 if ( argc != 3 ) {
1420                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1421                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1422                         return -1;
1423                 }
1424                 si->si_chkops = atoi( argv[1] );
1425                 si->si_chktime = atoi( argv[2] ) * 60;
1426
1427         } else {
1428                 return SLAP_CONF_UNKNOWN;
1429         }
1430 #endif
1431
1432         return SLAP_CONF_UNKNOWN;
1433 }
1434
1435 static int
1436 syncprov_db_init(
1437         BackendDB *be
1438 )
1439 {
1440         slap_overinst   *on = (slap_overinst *)be->bd_info;
1441         syncprov_info_t *si;
1442
1443         si = ch_calloc(1, sizeof(syncprov_info_t));
1444         on->on_bi.bi_private = si;
1445         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
1446         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
1447         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
1448
1449         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
1450         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
1451
1452         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
1453         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
1454
1455         return 0;
1456 }
1457
1458 static int
1459 syncprov_db_destroy(
1460         BackendDB *be
1461 )
1462 {
1463         slap_overinst   *on = (slap_overinst *)be->bd_info;
1464         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1465
1466         if ( si ) {
1467                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
1468                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
1469                 ch_free( si );
1470         }
1471
1472         return 0;
1473 }
1474
1475 static int syncprov_parseCtrl (
1476         Operation *op,
1477         SlapReply *rs,
1478         LDAPControl *ctrl )
1479 {
1480         ber_tag_t tag;
1481         BerElement *ber;
1482         ber_int_t mode;
1483         ber_len_t len;
1484         struct berval cookie = BER_BVNULL;
1485         sync_control *sr;
1486         int rhint = 0;
1487
1488         if ( op->o_sync != SLAP_CONTROL_NONE ) {
1489                 rs->sr_text = "Sync control specified multiple times";
1490                 return LDAP_PROTOCOL_ERROR;
1491         }
1492
1493         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
1494                 rs->sr_text = "Sync control specified with pagedResults control";
1495                 return LDAP_PROTOCOL_ERROR;
1496         }
1497
1498         if ( ctrl->ldctl_value.bv_len == 0 ) {
1499                 rs->sr_text = "Sync control value is empty (or absent)";
1500                 return LDAP_PROTOCOL_ERROR;
1501         }
1502
1503         /* Parse the control value
1504          *      syncRequestValue ::= SEQUENCE {
1505          *              mode   ENUMERATED {
1506          *                      -- 0 unused
1507          *                      refreshOnly             (1),
1508          *                      -- 2 reserved
1509          *                      refreshAndPersist       (3)
1510          *              },
1511          *              cookie  syncCookie OPTIONAL
1512          *      }
1513          */
1514
1515         ber = ber_init( &ctrl->ldctl_value );
1516         if( ber == NULL ) {
1517                 rs->sr_text = "internal error";
1518                 return LDAP_OTHER;
1519         }
1520
1521         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
1522                 rs->sr_text = "Sync control : mode decoding error";
1523                 return LDAP_PROTOCOL_ERROR;
1524         }
1525
1526         switch( mode ) {
1527         case LDAP_SYNC_REFRESH_ONLY:
1528                 mode = SLAP_SYNC_REFRESH;
1529                 break;
1530         case LDAP_SYNC_REFRESH_AND_PERSIST:
1531                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
1532                 break;
1533         default:
1534                 rs->sr_text = "Sync control : unknown update mode";
1535                 return LDAP_PROTOCOL_ERROR;
1536         }
1537
1538         tag = ber_peek_tag( ber, &len );
1539
1540         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
1541                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
1542                         rs->sr_text = "Sync control : cookie decoding error";
1543                         return LDAP_PROTOCOL_ERROR;
1544                 }
1545         }
1546         if ( tag == LDAP_TAG_RELOAD_HINT ) {
1547                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
1548                         rs->sr_text = "Sync control : rhint decoding error";
1549                         return LDAP_PROTOCOL_ERROR;
1550                 }
1551         }
1552         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
1553                         rs->sr_text = "Sync control : decoding error";
1554                         return LDAP_PROTOCOL_ERROR;
1555         }
1556         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
1557         sr->sr_rhint = rhint;
1558         if (!BER_BVISNULL(&cookie)) {
1559                 ber_bvarray_add( &sr->sr_state.octet_str, &cookie );
1560                 slap_parse_sync_cookie( &sr->sr_state );
1561         }
1562
1563         op->o_controls[sync_cid] = sr;
1564
1565         (void) ber_free( ber, 1 );
1566
1567         op->o_sync = ctrl->ldctl_iscritical
1568                 ? SLAP_CONTROL_CRITICAL
1569                 : SLAP_CONTROL_NONCRITICAL;
1570
1571         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
1572
1573         return LDAP_SUCCESS;
1574 }
1575
1576 /* This overlay is set up for dynamic loading via moduleload. For static
1577  * configuration, you'll need to arrange for the slap_overinst to be
1578  * initialized and registered by some other function inside slapd.
1579  */
1580
1581 static slap_overinst            syncprov;
1582
1583 int
1584 syncprov_init()
1585 {
1586         int rc;
1587
1588         rc = register_supported_control( LDAP_CONTROL_SYNC,
1589                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
1590                 syncprov_parseCtrl, &sync_cid );
1591         if ( rc != LDAP_SUCCESS ) {
1592                 fprintf( stderr, "Failed to register control %d\n", rc );
1593                 return rc;
1594         }
1595
1596         syncprov.on_bi.bi_type = "syncprov";
1597         syncprov.on_bi.bi_db_init = syncprov_db_init;
1598         syncprov.on_bi.bi_db_config = syncprov_db_config;
1599         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
1600
1601         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
1602         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
1603
1604         syncprov.on_bi.bi_op_add = syncprov_op_mod;
1605 #if 0
1606         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
1607 #endif
1608         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
1609         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
1610         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
1611         syncprov.on_bi.bi_op_search = syncprov_op_search;
1612         syncprov.on_bi.bi_extended = syncprov_op_extended;
1613
1614 #if 0
1615         syncprov.on_response = syncprov_response;
1616 #endif
1617
1618         return overlay_register( &syncprov );
1619 }
1620
1621 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
1622 int
1623 init_module( int argc, char *argv[] )
1624 {
1625         return syncprov_init();
1626 }
1627 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
1628
1629 #endif /* defined(SLAPD_OVER_SYNCPROV) */