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[3];
 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         /* FIXME: what if entryuuid is NULL or empty ? */
 182
 183         if ( send_cookie && cookie ) {
 184                 ber_printf( ber, "{eOON}",
 185                         entry_sync_state, &entryuuid_bv, cookie );
 186         } else {
 187                 ber_printf( ber, "{eON}",
 188                         entry_sync_state, &entryuuid_bv );
 189         }
 190
 191         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 192         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 193         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 194
 195         ber_free_buf( ber );
 196
 197         if ( ret < 0 ) {
 198                 Debug( LDAP_DEBUG_TRACE,
 199                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 200                         0, 0, 0 );
 201                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 202                 return ret;
 203         }
 204
 205         return LDAP_SUCCESS;
 206 }
 207
 208 /* Build a LDAPsync final state control */
 209 static int
 210 syncprov_done_ctrl(
 211         Operation       *op,
 212         SlapReply       *rs,
 213         LDAPControl     **ctrls,
 214         int                     num_ctrls,
 215         int                     send_cookie,
 216         struct berval *cookie,
 217         int                     refreshDeletes )
 218 {
 219         int ret;
 220         BerElementBuffer berbuf;
 221         BerElement *ber = (BerElement *)&berbuf;
 222
 223         ber_init2( ber, NULL, LBER_USE_DER );
 224         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 225
 226         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 227
 228         ber_printf( ber, "{" );
 229         if ( send_cookie && cookie ) {
 230                 ber_printf( ber, "O", cookie );
 231         }
 232         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 233                 ber_printf( ber, "b", refreshDeletes );
 234         }
 235         ber_printf( ber, "N}" );
 236
 237         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 238         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 239         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 240
 241         ber_free_buf( ber );
 242
 243         if ( ret < 0 ) {
 244                 Debug( LDAP_DEBUG_TRACE,
 245                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 246                         0, 0, 0 );
 247                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 248                 return ret;
 249         }
 250
 251         return LDAP_SUCCESS;
 252 }
 253
 254 static int
 255 syncprov_sendinfo(
 256         Operation       *op,
 257         SlapReply       *rs,
 258         int                     type,
 259         struct berval *cookie,
 260         int                     refreshDone,
 261         BerVarray       syncUUIDs,
 262         int                     refreshDeletes )
 263 {
 264         BerElementBuffer berbuf;
 265         BerElement *ber = (BerElement *)&berbuf;
 266         struct berval rspdata;
 267
 268         int ret;
 269
 270         ber_init2( ber, NULL, LBER_USE_DER );
 271         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 272
 273         if ( type ) {
 274                 switch ( type ) {
 275                 case LDAP_TAG_SYNC_NEW_COOKIE:
 276                         ber_printf( ber, "tO", type, cookie );
 277                         break;
 278                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 279                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 280                         ber_printf( ber, "t{", type );
 281                         if ( cookie ) {
 282                                 ber_printf( ber, "O", cookie );
 283                         }
 284                         if ( refreshDone == 0 ) {
 285                                 ber_printf( ber, "b", refreshDone );
 286                         }
 287                         ber_printf( ber, "N}" );
 288                         break;
 289                 case LDAP_TAG_SYNC_ID_SET:
 290                         ber_printf( ber, "t{", type );
 291                         if ( cookie ) {
 292                                 ber_printf( ber, "O", cookie );
 293                         }
 294                         if ( refreshDeletes == 1 ) {
 295                                 ber_printf( ber, "b", refreshDeletes );
 296                         }
 297                         ber_printf( ber, "[W]", syncUUIDs );
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 default:
 301                         Debug( LDAP_DEBUG_TRACE,
 302                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 303                                 type, 0, 0 );
 304                         return LDAP_OTHER;
 305                 }
 306         }
 307
 308         ret = ber_flatten2( ber, &rspdata, 0 );
 309
 310         if ( ret < 0 ) {
 311                 Debug( LDAP_DEBUG_TRACE,
 312                         "syncprov_sendinfo: ber_flatten2 failed\n",
 313                         0, 0, 0 );
 314                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 315                 return ret;
 316         }
 317
 318         rs->sr_rspoid = LDAP_SYNC_INFO;
 319         rs->sr_rspdata = &rspdata;
 320         send_ldap_intermediate( op, rs );
 321         rs->sr_rspdata = NULL;
 322         ber_free_buf( ber );
 323
 324         return LDAP_SUCCESS;
 325 }
 326
 327 /* Find a modtarget in an AVL tree */
 328 static int
 329 sp_avl_cmp( const void *c1, const void *c2 )
 330 {
 331         const modtarget *m1, *m2;
 332         int rc;
 333
 334         m1 = c1; m2 = c2;
 335         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 336
 337         if ( rc ) return rc;
 338         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 339 }
 340
 341 /* syncprov_findbase:
 342  *   finds the true DN of the base of a search (with alias dereferencing) and
 343  * checks to make sure the base entry doesn't get replaced with a different
 344  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 345  * change is detected, any persistent search on this base must be terminated /
 346  * reloaded.
 347  *   On the first call, we just save the DN and entryID. On subsequent calls
 348  * we compare the DN and entryID with the saved values.
 349  */
 350 static int
 351 findbase_cb( Operation *op, SlapReply *rs )
 352 {
 353         slap_callback *sc = op->o_callback;
 354
 355         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 356                 fbase_cookie *fc = sc->sc_private;
 357
 358                 /* If no entryID, we're looking for the first time.
 359                  * Just store whatever we got.
 360                  */
 361                 if ( fc->fss->s_eid == NOID ) {
 362                         fc->fbase = 1;
 363                         fc->fss->s_eid = rs->sr_entry->e_id;
 364                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 365
 366                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 367                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 368
 369                 /* OK, the DN is the same and the entryID is the same. Now
 370                  * see if the fdn resides in the scope.
 371                  */
 372                         fc->fbase = 1;
 373                         switch ( fc->fss->s_op->ors_scope ) {
 374                         case LDAP_SCOPE_BASE:
 375                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 376                                 break;
 377                         case LDAP_SCOPE_ONELEVEL: {
 378                                 struct berval pdn;
 379                                 dnParent( fc->fdn, &pdn );
 380                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 381                                 break; }
 382                         case LDAP_SCOPE_SUBTREE:
 383                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 384                                 break;
 385 #ifdef LDAP_SCOPE_SUBORDINATE
 386                         case LDAP_SCOPE_SUBORDINATE:
 387                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 388                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 389                                 break;
 390 #endif
 391                         }
 392                 }
 393         }
 394         if ( rs->sr_err != LDAP_SUCCESS ) {
 395                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 396         }
 397         return LDAP_SUCCESS;
 398 }
 399
 400 static int
 401 syncprov_findbase( Operation *op, fbase_cookie *fc )
 402 {
 403         opcookie *opc = op->o_callback->sc_private;
 404         slap_overinst *on = opc->son;
 405
 406         slap_callback cb = {0};
 407         Operation fop;
 408         SlapReply frs = { REP_RESULT };
 409         int rc;
 410
 411         fop = *op;
 412
 413         cb.sc_response = findbase_cb;
 414         cb.sc_private = fc;
 415
 416         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 417         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 418         fop.o_callback = &cb;
 419         fop.o_tag = LDAP_REQ_SEARCH;
 420         fop.ors_scope = LDAP_SCOPE_BASE;
 421         fop.ors_deref = fc->fss->s_op->ors_deref;
 422         fop.ors_limit = NULL;
 423         fop.ors_slimit = 1;
 424         fop.ors_tlimit = SLAP_NO_LIMIT;
 425         fop.ors_attrs = slap_anlist_no_attrs;
 426         fop.ors_attrsonly = 1;
 427         fop.ors_filter = fc->fss->s_op->ors_filter;
 428         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 429
 430         fop.o_req_dn = fc->fss->s_op->o_req_dn;
 431         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 432         fop.o_authz = fc->fss->s_op->o_authz;
 433
 434         fop.o_bd->bd_info = on->on_info->oi_orig;
 435         rc = fop.o_bd->be_search( &fop, &frs );
 436         fop.o_bd->bd_info = (BackendInfo *)on;
 437
 438         if ( fc->fbase ) return LDAP_SUCCESS;
 439
 440         /* If entryID has changed, then the base of this search has
 441          * changed. Invalidate the psearch.
 442          */
 443         return LDAP_NO_SUCH_OBJECT;
 444 }
 445
 446 /* syncprov_findcsn:
 447  *   This function has three different purposes, but they all use a search
 448  * that filters on entryCSN so they're combined here.
 449  * 1: at startup time, after a contextCSN has been read from the database,
 450  * we search for all entries with CSN >= contextCSN in case the contextCSN
 451  * was not checkpointed at the previous shutdown.
 452  *
 453  * 2: when the current contextCSN is known and we have a sync cookie, we search
 454  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 455  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 456  *
 457  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 458  * CSN, and generate Present records for them. We always collect this result
 459  * in SyncID sets, even if there's only one match.
 460  */
 461 #define FIND_MAXCSN     1
 462 #define FIND_CSN        2
 463 #define FIND_PRESENT    3
 464
 465 static int
 466 findmax_cb( Operation *op, SlapReply *rs )
 467 {
 468         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 469                 struct berval *maxcsn = op->o_callback->sc_private;
 470                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 471                         slap_schema.si_ad_entryCSN );
 472
 473                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 474                         maxcsn->bv_len = a->a_vals[0].bv_len;
 475                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 476                 }
 477         }
 478         return LDAP_SUCCESS;
 479 }
 480
 481 static int
 482 findcsn_cb( Operation *op, SlapReply *rs )
 483 {
 484         slap_callback *sc = op->o_callback;
 485
 486         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 487                 sc->sc_private = (void *)1;
 488         }
 489         return LDAP_SUCCESS;
 490 }
 491
 492 /* Build a list of entryUUIDs for sending in a SyncID set */
 493
 494 #define UUID_LEN        16
 495
 496 typedef struct fpres_cookie {
 497         int num;
 498         BerVarray uuids;
 499         char *last;
 500 } fpres_cookie;
 501
 502 static int
 503 findpres_cb( Operation *op, SlapReply *rs )
 504 {
 505         slap_callback *sc = op->o_callback;
 506         fpres_cookie *pc = sc->sc_private;
 507         Attribute *a;
 508         int ret = SLAP_CB_CONTINUE;
 509
 510         switch ( rs->sr_type ) {
 511         case REP_SEARCH:
 512                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 513                 if ( a ) {
 514                         pc->uuids[pc->num].bv_val = pc->last;
 515                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 516                                 pc->uuids[pc->num].bv_len );
 517                         pc->num++;
 518                         pc->last = pc->uuids[pc->num].bv_val;
 519                         pc->uuids[pc->num].bv_val = NULL;
 520                 }
 521                 ret = LDAP_SUCCESS;
 522                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 523                         break;
 524                 /* FALLTHRU */
 525         case REP_RESULT:
 526                 ret = rs->sr_err;
 527                 if ( pc->num ) {
 528                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 529                                 0, pc->uuids, 0 );
 530                         pc->uuids[pc->num].bv_val = pc->last;
 531                         pc->num = 0;
 532                         pc->last = pc->uuids[0].bv_val;
 533                 }
 534                 break;
 535         default:
 536                 break;
 537         }
 538         return ret;
 539 }
 540
 541 static int
 542 syncprov_findcsn( Operation *op, int mode )
 543 {
 544         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 545         syncprov_info_t         *si = on->on_bi.bi_private;
 546
 547         slap_callback cb = {0};
 548         Operation fop;
 549         SlapReply frs = { REP_RESULT };
 550         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 551         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 552         struct berval maxcsn;
 553         Filter cf, af;
 554 #ifdef LDAP_COMP_MATCH
 555         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 556 #else
 557         AttributeAssertion eq = { NULL, BER_BVNULL };
 558 #endif
 559         int i, rc = LDAP_SUCCESS;
 560         fpres_cookie pcookie;
 561         sync_control *srs = NULL;
 562         int findcsn_retry = 1;
 563
 564         if ( mode != FIND_MAXCSN ) {
 565                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 566
 567                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 568                         return LDAP_OTHER;
 569                 }
 570         }
 571
 572         fop = *op;
 573         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 574         /* We want pure entries, not referrals */
 575         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 576
 577         cf.f_ava = &eq;
 578         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 579         cf.f_next = NULL;
 580
 581         fop.o_callback = &cb;
 582         fop.ors_limit = NULL;
 583         fop.ors_tlimit = SLAP_NO_LIMIT;
 584         fop.ors_filter = &cf;
 585         fop.ors_filterstr.bv_val = buf;
 586
 587 again:
 588         switch( mode ) {
 589         case FIND_MAXCSN:
 590                 cf.f_choice = LDAP_FILTER_GE;
 591                 cf.f_av_value = si->si_ctxcsn;
 592                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 593                         cf.f_av_value.bv_val );
 594                 fop.ors_attrsonly = 0;
 595                 fop.ors_attrs = csn_anlist;
 596                 fop.ors_slimit = SLAP_NO_LIMIT;
 597                 cb.sc_private = &maxcsn;
 598                 cb.sc_response = findmax_cb;
 599                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 600                 maxcsn.bv_val = cbuf;
 601                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 602                 break;
 603         case FIND_CSN:
 604                 cf.f_av_value = srs->sr_state.ctxcsn;
 605                 /* Look for exact match the first time */
 606                 if ( findcsn_retry ) {
 607                         cf.f_choice = LDAP_FILTER_EQUALITY;
 608                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 609                                 cf.f_av_value.bv_val );
 610                 /* On retry, look for <= */
 611                 } else {
 612                         cf.f_choice = LDAP_FILTER_LE;
 613                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 614                                 cf.f_av_value.bv_val );
 615                 }
 616                 fop.ors_attrsonly = 1;
 617                 fop.ors_attrs = slap_anlist_no_attrs;
 618                 fop.ors_slimit = 1;
 619                 cb.sc_private = NULL;
 620                 cb.sc_response = findcsn_cb;
 621                 break;
 622         case FIND_PRESENT:
 623                 af.f_choice = LDAP_FILTER_AND;
 624                 af.f_next = NULL;
 625                 af.f_and = &cf;
 626                 cf.f_choice = LDAP_FILTER_LE;
 627                 cf.f_av_value = srs->sr_state.ctxcsn;
 628                 cf.f_next = op->ors_filter;
 629                 fop.ors_filter = &af;
 630                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 631                 fop.ors_attrsonly = 0;
 632                 fop.ors_attrs = uuid_anlist;
 633                 fop.ors_slimit = SLAP_NO_LIMIT;
 634                 cb.sc_private = &pcookie;
 635                 cb.sc_response = findpres_cb;
 636                 pcookie.num = 0;
 637
 638                 /* preallocate storage for a full set */
 639                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 640                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 641                         op->o_tmpmemctx );
 642                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 643                 pcookie.uuids[0].bv_val = pcookie.last;
 644                 pcookie.uuids[0].bv_len = UUID_LEN;
 645                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 646                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 647                         pcookie.uuids[i].bv_len = UUID_LEN;
 648                 }
 649                 break;
 650         }
 651
 652         fop.o_bd->bd_info = on->on_info->oi_orig;
 653         fop.o_bd->be_search( &fop, &frs );
 654         fop.o_bd->bd_info = (BackendInfo *)on;
 655
 656         switch( mode ) {
 657         case FIND_MAXCSN:
 658                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 659                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 660                 break;
 661         case FIND_CSN:
 662                 /* If matching CSN was not found, invalidate the context. */
 663                 if ( !cb.sc_private ) {
 664                         /* If we didn't find an exact match, then try for <= */
 665                         if ( findcsn_retry ) {
 666                                 findcsn_retry = 0;
 667                                 goto again;
 668                         }
 669                         rc = LDAP_NO_SUCH_OBJECT;
 670                 }
 671                 break;
 672         case FIND_PRESENT:
 673                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 674                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 675                 break;
 676         }
 677
 678         return rc;
 679 }
 680
 681 /* Queue a persistent search response */
 682 static int
 683 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 684 {
 685         syncres *sr;
 686
 687         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 688                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 689         sr->s_next = NULL;
 690         sr->s_dn.bv_val = (char *)(sr + 1);
 691         sr->s_dn.bv_len = opc->sdn.bv_len;
 692         sr->s_mode = mode;
 693         sr->s_isreference = opc->sreference;
 694         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 695         sr->s_ndn.bv_len = opc->sndn.bv_len;
 696         *(sr->s_ndn.bv_val++) = '\0';
 697         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 698         sr->s_uuid.bv_len = opc->suuid.bv_len;
 699         *(sr->s_uuid.bv_val++) = '\0';
 700         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 701         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 702         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 703
 704         if ( !so->s_res ) {
 705                 so->s_res = sr;
 706         } else {
 707                 so->s_restail->s_next = sr;
 708         }
 709         so->s_restail = sr;
 710         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 711         return LDAP_SUCCESS;
 712 }
 713
 714 /* Play back queued responses */
 715 static int
 716 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue );
 717
 718 static int
 719 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 720 {
 721         syncres *sr, *srnext;
 722         Entry *e;
 723         opcookie opc;
 724         int rc;
 725
 726         opc.son = on;
 727         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 728         for (sr = so->s_res; sr; sr=srnext) {
 729                 srnext = sr->s_next;
 730                 opc.sdn = sr->s_dn;
 731                 opc.sndn = sr->s_ndn;
 732                 opc.suuid = sr->s_uuid;
 733                 opc.sctxcsn = sr->s_csn;
 734                 opc.sreference = sr->s_isreference;
 735                 e = NULL;
 736
 737                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 738                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 739                         if ( rc ) {
 740                                 ch_free( sr );
 741                                 so->s_res = srnext;
 742                                 continue;
 743                         }
 744                 }
 745                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode, 0 );
 746
 747                 if ( e ) {
 748                         be_entry_release_rw( op, e, 0 );
 749                 }
 750                 if ( rc )
 751                         break;
 752
 753                 ch_free( sr );
 754                 so->s_res = srnext;
 755         }
 756         op->o_bd->bd_info = (BackendInfo *)on;
 757         if ( !so->s_res )
 758                 so->s_restail = NULL;
 759         return rc;
 760 }
 761
 762 /* Send a persistent search response */
 763 static int
 764 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode, int queue )
 765 {
 766         slap_overinst *on = opc->son;
 767
 768         SlapReply rs = { REP_SEARCH };
 769         LDAPControl *ctrls[2];
 770         struct berval cookie;
 771         Entry e_uuid = {0};
 772         Attribute a_uuid = {0};
 773         Operation sop = *so->s_op;
 774         Opheader ohdr;
 775
 776         if ( so->s_op->o_abandon )
 777                 return SLAPD_ABANDON;
 778
 779         ohdr = *sop.o_hdr;
 780         sop.o_hdr = &ohdr;
 781         sop.o_tmpmemctx = op->o_tmpmemctx;
 782         sop.o_bd = op->o_bd;
 783         sop.o_controls = op->o_controls;
 784         sop.o_private = op->o_private;
 785
 786         /* If queueing is allowed */
 787         if ( queue ) {
 788                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 789                 /* If we're still in refresh mode, must queue */
 790                 if (so->s_flags & PS_IS_REFRESHING) {
 791                         return syncprov_qresp( opc, so, mode );
 792                 }
 793                 /* If connection is free but queue is non-empty,
 794                  * try to flush the queue.
 795                  */
 796                 if ( so->s_res ) {
 797                         rs.sr_err = syncprov_qplay( &sop, on, so );
 798                 }
 799                 /* If the connection is busy, must queue */
 800                 if ( sop.o_conn->c_writewaiter || rs.sr_err == LDAP_BUSY ) {
 801                         return syncprov_qresp( opc, so, mode );
 802                 }
 803                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 804
 805                 /* If syncprov_qplay returned any other error, bail out. */
 806                 if ( rs.sr_err ) {
 807                         return rs.sr_err;
 808                 }
 809         } else {
 810                 /* Queueing not allowed and conn is busy, give up */
 811                 if ( sop.o_conn->c_writewaiter )
 812                         return LDAP_BUSY;
 813         }
 814
 815         ctrls[1] = NULL;
 816         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 817
 818         e_uuid.e_attrs = &a_uuid;
 819         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 820         a_uuid.a_nvals = &opc->suuid;
 821         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 822                 mode, ctrls, 0, 1, &cookie );
 823
 824         rs.sr_ctrls = ctrls;
 825         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 826         switch( mode ) {
 827         case LDAP_SYNC_ADD:
 828                 rs.sr_entry = *e;
 829                 if ( rs.sr_entry->e_private )
 830                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 831                 if ( opc->sreference ) {
 832                         rs.sr_ref = get_entry_referrals( &sop, rs.sr_entry );
 833                         send_search_reference( &sop, &rs );
 834                         ber_bvarray_free( rs.sr_ref );
 835                         if ( !rs.sr_entry )
 836                                 *e = NULL;
 837                         break;
 838                 }
 839                 /* fallthru */
 840         case LDAP_SYNC_MODIFY:
 841                 rs.sr_entry = *e;
 842                 if ( rs.sr_entry->e_private )
 843                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 844                 rs.sr_attrs = sop.ors_attrs;
 845                 send_search_entry( &sop, &rs );
 846                 if ( !rs.sr_entry )
 847                         *e = NULL;
 848                 break;
 849         case LDAP_SYNC_DELETE:
 850                 e_uuid.e_attrs = NULL;
 851                 e_uuid.e_name = opc->sdn;
 852                 e_uuid.e_nname = opc->sndn;
 853                 rs.sr_entry = &e_uuid;
 854                 if ( opc->sreference ) {
 855                         struct berval bv = BER_BVNULL;
 856                         rs.sr_ref = &bv;
 857                         send_search_reference( &sop, &rs );
 858                 } else {
 859                         send_search_entry( &sop, &rs );
 860                 }
 861                 break;
 862         default:
 863                 assert(0);
 864         }
 865         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 866         op->o_private = sop.o_private;
 867         rs.sr_ctrls = NULL;
 868         /* Check queue again here; if we were hanging in a send and eventually
 869          * recovered, there may be more to send now. But don't check if the
 870          * original psearch has been abandoned.
 871          */
 872         if ( so->s_op->o_abandon )
 873                 return SLAPD_ABANDON;
 874
 875         if ( rs.sr_err == LDAP_SUCCESS && queue && so->s_res ) {
 876                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 877                 rs.sr_err = syncprov_qplay( &sop, on, so );
 878                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 879         }
 880         return rs.sr_err;
 881 }
 882
 883 static void
 884 syncprov_free_syncop( syncops *so )
 885 {
 886         syncres *sr, *srnext;
 887         GroupAssertion *ga, *gnext;
 888
 889         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 890         so->s_inuse--;
 891         if ( so->s_inuse > 0 ) {
 892                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 893                 return;
 894         }
 895         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 896         if ( so->s_flags & PS_IS_DETACHED ) {
 897                 filter_free( so->s_op->ors_filter );
 898                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 899                         gnext = ga->ga_next;
 900                         ch_free( ga );
 901                 }
 902                 ch_free( so->s_op );
 903         }
 904         ch_free( so->s_base.bv_val );
 905         for ( sr=so->s_res; sr; sr=srnext ) {
 906                 srnext = sr->s_next;
 907                 ch_free( sr );
 908         }
 909         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 910         ch_free( so );
 911 }
 912
 913 static int
 914 syncprov_drop_psearch( syncops *so, int lock )
 915 {
 916         if ( so->s_flags & PS_IS_DETACHED ) {
 917                 if ( lock )
 918                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 919                 so->s_op->o_conn->c_n_ops_executing--;
 920                 so->s_op->o_conn->c_n_ops_completed++;
 921                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 922                         o_next );
 923                 if ( lock )
 924                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 925         }
 926         syncprov_free_syncop( so );
 927
 928         return 0;
 929 }
 930
 931 static int
 932 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 933 {
 934         slap_callback *sc = op->o_callback;
 935         op->o_callback = sc->sc_next;
 936         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 937         op->o_tmpfree( sc, op->o_tmpmemctx );
 938         return 0;
 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                 /* Is this really a Cancel exop? */
 961                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 962                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 963                         rs->sr_err = LDAP_CANCELLED;
 964                         send_ldap_result( so->s_op, rs );
 965                         if ( so->s_flags & PS_IS_DETACHED ) {
 966                                 slap_callback *cb;
 967                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
 968                                 cb->sc_cleanup = syncprov_ab_cleanup;
 969                                 cb->sc_next = op->o_callback;
 970                                 cb->sc_private = so;
 971                                 return SLAP_CB_CONTINUE;
 972                         }
 973                 }
 974                 syncprov_drop_psearch( so, 0 );
 975         }
 976         return SLAP_CB_CONTINUE;
 977 }
 978
 979 /* Find which persistent searches are affected by this operation */
 980 static void
 981 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 982 {
 983         slap_overinst *on = opc->son;
 984         syncprov_info_t         *si = on->on_bi.bi_private;
 985
 986         fbase_cookie fc;
 987         syncops *ss, *sprev, *snext;
 988         Entry *e;
 989         Attribute *a;
 990         int rc;
 991         struct berval newdn;
 992         int freefdn = 0;
 993
 994         fc.fdn = &op->o_req_ndn;
 995         /* compute new DN */
 996         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 997                 struct berval pdn;
 998                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 999                 else dnParent( fc.fdn, &pdn );
1000                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1001                 fc.fdn = &newdn;
1002                 freefdn = 1;
1003         }
1004         if ( op->o_tag != LDAP_REQ_ADD ) {
1005                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1006                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1007                 /* If we're sending responses now, make a copy and unlock the DB */
1008                 if ( e && !saveit ) {
1009                         Entry *e2 = entry_dup( e );
1010                         be_entry_release_rw( op, e, 0 );
1011                         e = e2;
1012                 }
1013                 op->o_bd->bd_info = (BackendInfo *)on;
1014                 if ( rc ) return;
1015         } else {
1016                 e = op->ora_e;
1017         }
1018
1019         if ( saveit ) {
1020                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1021                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1022                 opc->sreference = is_entry_referral( e );
1023         }
1024         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1025                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1026                 if ( a )
1027                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1028         }
1029
1030         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1031         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1032                 sprev = ss, ss=snext)
1033         {
1034                 syncmatches *sm;
1035                 int found = 0;
1036
1037                 snext = ss->s_next;
1038                 /* validate base */
1039                 fc.fss = ss;
1040                 fc.fbase = 0;
1041                 fc.fscope = 0;
1042
1043                 /* If the base of the search is missing, signal a refresh */
1044                 rc = syncprov_findbase( op, &fc );
1045                 if ( rc != LDAP_SUCCESS ) {
1046                         SlapReply rs = {REP_RESULT};
1047                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1048                                 "search base has changed" );
1049                         sprev->s_next = snext;
1050                         syncprov_drop_psearch( ss, 1 );
1051                         continue;
1052                 }
1053
1054                 /* If we're sending results now, look for this op in old matches */
1055                 if ( !saveit ) {
1056                         syncmatches *old;
1057                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1058                                 old=sm, sm=sm->sm_next ) {
1059                                 if ( sm->sm_op == ss ) {
1060                                         found = 1;
1061                                         old->sm_next = sm->sm_next;
1062                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1063                                         break;
1064                                 }
1065                         }
1066                 }
1067
1068                 /* check if current o_req_dn is in scope and matches filter */
1069                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1070                         LDAP_COMPARE_TRUE ) {
1071                         if ( saveit ) {
1072                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1073                                 sm->sm_next = opc->smatches;
1074                                 sm->sm_op = ss;
1075                                 ss->s_inuse++;
1076                                 opc->smatches = sm;
1077                         } else {
1078                                 /* if found send UPDATE else send ADD */
1079                                 ss->s_inuse++;
1080                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1081                                 syncprov_sendresp( op, opc, ss, &e,
1082                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
1083                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1084                                 ss->s_inuse--;
1085                         }
1086                 } else if ( !saveit && found ) {
1087                         /* send DELETE */
1088                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1089                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
1090                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1091                 }
1092         }
1093         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1094
1095         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1096                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1097                 be_entry_release_rw( op, e, 0 );
1098                 op->o_bd->bd_info = (BackendInfo *)on;
1099         }
1100         if ( freefdn ) {
1101                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1102         }
1103 }
1104
1105 static int
1106 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1107 {
1108         slap_callback *cb = op->o_callback;
1109         opcookie *opc = cb->sc_private;
1110         slap_overinst *on = opc->son;
1111         syncprov_info_t         *si = on->on_bi.bi_private;
1112         syncmatches *sm, *snext;
1113         modtarget *mt, mtdummy;
1114
1115         for (sm = opc->smatches; sm; sm=snext) {
1116                 snext = sm->sm_next;
1117                 syncprov_free_syncop( sm->sm_op );
1118                 op->o_tmpfree( sm, op->o_tmpmemctx );
1119         }
1120
1121         /* Remove op from lock table */
1122         mtdummy.mt_op = op;
1123         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1124         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1125         if ( mt ) {
1126                 modinst *mi = mt->mt_mods;
1127
1128                 /* If there are more, promote the next one */
1129                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1130                 if ( mi->mi_next ) {
1131                         mt->mt_mods = mi->mi_next;
1132                         mt->mt_op = mt->mt_mods->mi_op;
1133                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1134                 } else {
1135                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1136                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1137                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1138                         ch_free( mt );
1139                 }
1140         }
1141         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1142         if ( !BER_BVISNULL( &opc->suuid ))
1143                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1144         if ( !BER_BVISNULL( &opc->sndn ))
1145                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1146         if ( !BER_BVISNULL( &opc->sdn ))
1147                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1148         op->o_callback = cb->sc_next;
1149         op->o_tmpfree(cb, op->o_tmpmemctx);
1150
1151         return 0;
1152 }
1153
1154 static void
1155 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1156 {
1157         syncprov_info_t         *si = on->on_bi.bi_private;
1158         Modifications mod;
1159         Operation opm;
1160         struct berval bv[2];
1161         slap_callback cb = {0};
1162         int manage = get_manageDSAit(op);
1163
1164         mod.sml_values = bv;
1165         bv[1].bv_val = NULL;
1166         bv[0] = si->si_ctxcsn;
1167         mod.sml_nvalues = NULL;
1168         mod.sml_desc = slap_schema.si_ad_contextCSN;
1169         mod.sml_op = LDAP_MOD_REPLACE;
1170         mod.sml_flags = 0;
1171         mod.sml_next = NULL;
1172
1173         cb.sc_response = slap_null_cb;
1174         opm = *op;
1175         opm.o_tag = LDAP_REQ_MODIFY;
1176         opm.o_callback = &cb;
1177         opm.orm_modlist = &mod;
1178         opm.o_req_dn = op->o_bd->be_suffix[0];
1179         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1180         opm.o_bd->bd_info = on->on_info->oi_orig;
1181         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1182         opm.o_bd->be_modify( &opm, rs );
1183         opm.o_managedsait = manage;
1184 }
1185
1186 static void
1187 syncprov_add_slog( Operation *op, struct berval *csn )
1188 {
1189         opcookie *opc = op->o_callback->sc_private;
1190         slap_overinst *on = opc->son;
1191         syncprov_info_t         *si = on->on_bi.bi_private;
1192         sessionlog *sl;
1193         slog_entry *se;
1194
1195         sl = si->si_logs;
1196         {
1197                 /* Allocate a record. UUIDs are not NUL-terminated. */
1198                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1199                         csn->bv_len + 1 );
1200                 se->se_next = NULL;
1201                 se->se_tag = op->o_tag;
1202
1203                 se->se_uuid.bv_val = (char *)(se+1);
1204                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1205                 se->se_uuid.bv_len = opc->suuid.bv_len;
1206
1207                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1208                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1209                 se->se_csn.bv_val[csn->bv_len] = '\0';
1210                 se->se_csn.bv_len = csn->bv_len;
1211
1212                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1213                 if ( sl->sl_head ) {
1214                         sl->sl_tail->se_next = se;
1215                 } else {
1216                         sl->sl_head = se;
1217                 }
1218                 sl->sl_tail = se;
1219                 sl->sl_num++;
1220                 while ( sl->sl_num > sl->sl_size ) {
1221                         se = sl->sl_head;
1222                         sl->sl_head = se->se_next;
1223                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1224                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1225                         ch_free( se );
1226                         sl->sl_num--;
1227                         if ( !sl->sl_head ) {
1228                                 sl->sl_tail = NULL;
1229                         }
1230                 }
1231                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1232         }
1233 }
1234
1235 /* Just set a flag if we found the matching entry */
1236 static int
1237 playlog_cb( Operation *op, SlapReply *rs )
1238 {
1239         if ( rs->sr_type == REP_SEARCH ) {
1240                 op->o_callback->sc_private = (void *)1;
1241         }
1242         return rs->sr_err;
1243 }
1244
1245 /* enter with sl->sl_mutex locked, release before returning */
1246 static void
1247 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1248         struct berval *oldcsn, struct berval *ctxcsn )
1249 {
1250         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1251         slog_entry *se;
1252         int i, j, ndel, num, nmods, mmods;
1253         BerVarray uuids;
1254
1255         if ( !sl->sl_num ) {
1256                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1257                 return;
1258         }
1259
1260         num = sl->sl_num;
1261         i = 0;
1262         nmods = 0;
1263
1264         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1265                 num * UUID_LEN, op->o_tmpmemctx );
1266
1267         uuids[0].bv_val = (char *)(uuids + num + 1);
1268
1269         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1270          * and everything else at the end. Do this first so we can
1271          * unlock the list mutex.
1272          */
1273         for ( se=sl->sl_head; se; se=se->se_next ) {
1274                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1275                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1276                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1277                         j = i;
1278                         i++;
1279                 } else {
1280                         nmods++;
1281                         j = num - nmods;
1282                 }
1283                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1284                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1285                 uuids[j].bv_len = UUID_LEN;
1286         }
1287         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1288
1289         ndel = i;
1290
1291         /* Zero out unused slots */
1292         for ( i=ndel; i < num - nmods; i++ )
1293                 uuids[i].bv_len = 0;
1294
1295         /* Mods must be validated to see if they belong in this delete set.
1296          */
1297
1298         mmods = nmods;
1299         /* Strip any duplicates */
1300         for ( i=0; i<nmods; i++ ) {
1301                 for ( j=0; j<ndel; j++ ) {
1302                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1303                                 uuids[num - 1 - i].bv_len = 0;
1304                                 mmods --;
1305                                 break;
1306                         }
1307                 }
1308                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1309                 for ( j=0; j<i; j++ ) {
1310                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1311                                 uuids[num - 1 - i].bv_len = 0;
1312                                 mmods --;
1313                                 break;
1314                         }
1315                 }
1316         }
1317
1318         if ( mmods ) {
1319                 Operation fop;
1320                 SlapReply frs = { REP_RESULT };
1321                 int rc;
1322                 Filter mf, af;
1323 #ifdef LDAP_COMP_MATCH
1324                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1325 #else
1326                 AttributeAssertion eq;
1327 #endif
1328                 slap_callback cb = {0};
1329
1330                 fop = *op;
1331
1332                 fop.o_sync_mode = 0;
1333                 fop.o_callback = &cb;
1334                 fop.ors_limit = NULL;
1335                 fop.ors_tlimit = SLAP_NO_LIMIT;
1336                 fop.ors_attrs = slap_anlist_all_attributes;
1337                 fop.ors_attrsonly = 0;
1338                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1339
1340                 af.f_choice = LDAP_FILTER_AND;
1341                 af.f_next = NULL;
1342                 af.f_and = &mf;
1343                 mf.f_choice = LDAP_FILTER_EQUALITY;
1344                 mf.f_ava = &eq;
1345                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1346                 mf.f_next = fop.ors_filter;
1347
1348                 fop.ors_filter = &af;
1349
1350                 cb.sc_response = playlog_cb;
1351                 fop.o_bd->bd_info = on->on_info->oi_orig;
1352
1353                 for ( i=ndel; i<num; i++ ) {
1354                         if ( uuids[i].bv_len == 0 ) continue;
1355
1356                         mf.f_av_value = uuids[i];
1357                         cb.sc_private = NULL;
1358                         fop.ors_slimit = 1;
1359                         rc = fop.o_bd->be_search( &fop, &frs );
1360
1361                         /* If entry was not found, add to delete list */
1362                         if ( !cb.sc_private ) {
1363                                 uuids[ndel++] = uuids[i];
1364                         }
1365                 }
1366                 fop.o_bd->bd_info = (BackendInfo *)on;
1367         }
1368         if ( ndel ) {
1369                 uuids[ndel].bv_val = NULL;
1370                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1371         }
1372 }
1373
1374 static int
1375 syncprov_op_response( Operation *op, SlapReply *rs )
1376 {
1377         opcookie *opc = op->o_callback->sc_private;
1378         slap_overinst *on = opc->son;
1379         syncprov_info_t         *si = on->on_bi.bi_private;
1380         syncmatches *sm;
1381
1382         if ( rs->sr_err == LDAP_SUCCESS )
1383         {
1384                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1385                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1386
1387                 /* Update our context CSN */
1388                 cbuf[0] = '\0';
1389                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1390                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1391                 if ( !BER_BVISNULL( &maxcsn ) ) {
1392                         strcpy( cbuf, maxcsn.bv_val );
1393                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1394                                 strcpy( si->si_ctxcsnbuf, cbuf );
1395                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1396                         }
1397                 }
1398
1399                 /* Don't do any processing for consumer contextCSN updates */
1400                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1401                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1402                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1403                         return SLAP_CB_CONTINUE;
1404                 }
1405
1406                 si->si_numops++;
1407                 if ( si->si_chkops || si->si_chktime ) {
1408                         int do_check=0;
1409                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1410                                 do_check = 1;
1411                                 si->si_numops = 0;
1412                         }
1413                         if ( si->si_chktime &&
1414                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1415                                 do_check = 1;
1416                                 si->si_chklast = op->o_time;
1417                         }
1418                         if ( do_check ) {
1419                                 syncprov_checkpoint( op, rs, on );
1420                         }
1421                 }
1422                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1423
1424                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1425                 opc->sctxcsn.bv_val = cbuf;
1426
1427                 /* Handle any persistent searches */
1428                 if ( si->si_ops ) {
1429                         switch(op->o_tag) {
1430                         case LDAP_REQ_ADD:
1431                         case LDAP_REQ_MODIFY:
1432                         case LDAP_REQ_MODRDN:
1433                         case LDAP_REQ_EXTENDED:
1434                                 syncprov_matchops( op, opc, 0 );
1435                                 break;
1436                         case LDAP_REQ_DELETE:
1437                                 /* for each match in opc->smatches:
1438                                  *   send DELETE msg
1439                                  */
1440                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1441                                         if ( sm->sm_op->s_op->o_abandon )
1442                                                 continue;
1443                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1444                                                 LDAP_SYNC_DELETE, 1 );
1445                                 }
1446                                 break;
1447                         }
1448                 }
1449
1450                 /* Add any log records */
1451                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1452                         syncprov_add_slog( op, &curcsn );
1453                 }
1454
1455         }
1456         return SLAP_CB_CONTINUE;
1457 }
1458
1459 /* We don't use a subentry to store the context CSN any more.
1460  * We expose the current context CSN as an operational attribute
1461  * of the suffix entry.
1462  */
1463 static int
1464 syncprov_op_compare( Operation *op, SlapReply *rs )
1465 {
1466         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1467         syncprov_info_t         *si = on->on_bi.bi_private;
1468         int rc = SLAP_CB_CONTINUE;
1469
1470         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1471                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1472         {
1473                 Entry e = {0};
1474                 Attribute a = {0};
1475                 struct berval bv[2];
1476
1477                 e.e_name = op->o_bd->be_suffix[0];
1478                 e.e_nname = op->o_bd->be_nsuffix[0];
1479
1480                 BER_BVZERO( &bv[1] );
1481                 bv[0] = si->si_ctxcsn;
1482
1483                 a.a_desc = slap_schema.si_ad_contextCSN;
1484                 a.a_vals = bv;
1485                 a.a_nvals = a.a_vals;
1486
1487                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1488
1489                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1490                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1491                 if ( ! rs->sr_err ) {
1492                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1493                         goto return_results;
1494                 }
1495
1496                 if ( get_assert( op ) &&
1497                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1498                 {
1499                         rs->sr_err = LDAP_ASSERTION_FAILED;
1500                         goto return_results;
1501                 }
1502
1503
1504                 rs->sr_err = LDAP_COMPARE_FALSE;
1505
1506                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1507                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1508                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1509                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1510                 {
1511                         rs->sr_err = LDAP_COMPARE_TRUE;
1512                 }
1513
1514 return_results:;
1515
1516                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1517
1518                 send_ldap_result( op, rs );
1519
1520                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1521                         rs->sr_err = LDAP_SUCCESS;
1522                 }
1523                 rc = rs->sr_err;
1524         }
1525
1526         return rc;
1527 }
1528
1529 static int
1530 syncprov_op_mod( Operation *op, SlapReply *rs )
1531 {
1532         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1533         syncprov_info_t         *si = on->on_bi.bi_private;
1534
1535         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1536                 sizeof(opcookie) +
1537                 (si->si_ops ? sizeof(modinst) : 0 ),
1538                 op->o_tmpmemctx);
1539         opcookie *opc = (opcookie *)(cb+1);
1540         opc->son = on;
1541         cb->sc_response = syncprov_op_response;
1542         cb->sc_cleanup = syncprov_op_cleanup;
1543         cb->sc_private = opc;
1544         cb->sc_next = op->o_callback;
1545         op->o_callback = cb;
1546
1547         /* If there are active persistent searches, lock this operation.
1548          * See seqmod.c for the locking logic on its own.
1549          */
1550         if ( si->si_ops ) {
1551                 modtarget *mt, mtdummy;
1552                 modinst *mi;
1553
1554                 mi = (modinst *)(opc+1);
1555                 mi->mi_op = op;
1556
1557                 /* See if we're already modifying this entry... */
1558                 mtdummy.mt_op = op;
1559                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1560                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1561                 if ( mt ) {
1562                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1563                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1564                         mt->mt_tail->mi_next = mi;
1565                         mt->mt_tail = mi;
1566                         /* wait for this op to get to head of list */
1567                         while ( mt->mt_mods != mi ) {
1568                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1569                                 ldap_pvt_thread_yield();
1570                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1571
1572                                 /* clean up if the caller is giving up */
1573                                 if ( op->o_abandon ) {
1574                                         modinst *m2;
1575                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1576                                                 m2 = m2->mi_next );
1577                                         m2->mi_next = mi->mi_next;
1578                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1579                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1580                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1581                                         return SLAPD_ABANDON;
1582                                 }
1583                         }
1584                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1585                 } else {
1586                         /* Record that we're modifying this entry now */
1587                         mt = ch_malloc( sizeof(modtarget) );
1588                         mt->mt_mods = mi;
1589                         mt->mt_tail = mi;
1590                         mt->mt_op = mi->mi_op;
1591                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1592                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1593                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1594                 }
1595         }
1596
1597         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1598                 syncprov_matchops( op, opc, 1 );
1599
1600         return SLAP_CB_CONTINUE;
1601 }
1602
1603 static int
1604 syncprov_op_extended( Operation *op, SlapReply *rs )
1605 {
1606         if ( exop_is_write( op ))
1607                 return syncprov_op_mod( op, rs );
1608
1609         return SLAP_CB_CONTINUE;
1610 }
1611
1612 typedef struct searchstate {
1613         slap_overinst *ss_on;
1614         syncops *ss_so;
1615         int ss_present;
1616         struct berval ss_ctxcsn;
1617         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1618 } searchstate;
1619
1620 static int
1621 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1622 {
1623         if ( rs->sr_ctrls ) {
1624                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1625                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1626                 rs->sr_ctrls = NULL;
1627         }
1628         return 0;
1629 }
1630
1631 static void
1632 syncprov_detach_op( Operation *op, syncops *so )
1633 {
1634         Operation *op2;
1635         int i, alen = 0;
1636         size_t size;
1637         char *ptr;
1638         GroupAssertion *g1, *g2;
1639
1640         /* count the search attrs */
1641         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1642                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1643         }
1644         /* Make a new copy of the operation */
1645         size = sizeof(Operation) + sizeof(Opheader) +
1646                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1647                 op->o_req_dn.bv_len + 1 +
1648                 op->o_req_ndn.bv_len + 1 +
1649                 op->o_ndn.bv_len + 1 +
1650                 so->s_filterstr.bv_len + 1;
1651         op2 = (Operation *)ch_calloc( 1, size );
1652         op2->o_hdr = (Opheader *)(op2+1);
1653
1654         /* Copy the fields we care about explicitly, leave the rest alone */
1655         *op2->o_hdr = *op->o_hdr;
1656         op2->o_tag = op->o_tag;
1657         op2->o_time = op->o_time;
1658         op2->o_bd = op->o_bd;
1659         op2->o_request = op->o_request;
1660
1661         if ( i ) {
1662                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1663                 ptr = (char *)(op2->ors_attrs+i+1);
1664                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1665                         op2->ors_attrs[i] = op->ors_attrs[i];
1666                         op2->ors_attrs[i].an_name.bv_val = ptr;
1667                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1668                 }
1669                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1670         } else {
1671                 ptr = (char *)(op2->o_hdr + 1);
1672         }
1673         op2->o_authz = op->o_authz;
1674         op2->o_ndn.bv_val = ptr;
1675         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1676         op2->o_dn = op2->o_ndn;
1677         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1678         op2->o_req_dn.bv_val = ptr;
1679         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1680         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1681         op2->o_req_ndn.bv_val = ptr;
1682         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1683         op2->ors_filterstr.bv_val = ptr;
1684         strcpy( ptr, so->s_filterstr.bv_val );
1685         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1686         op2->ors_filter = str2filter( ptr );
1687         so->s_op = op2;
1688
1689         /* Copy any cached group ACLs individually */
1690         op2->o_groups = NULL;
1691         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1692                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1693                 *g2 = *g1;
1694                 strcpy( g2->ga_ndn, g1->ga_ndn );
1695                 g2->ga_next = op2->o_groups;
1696                 op2->o_groups = g2;
1697         }
1698
1699         /* Add op2 to conn so abandon will find us */
1700         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1701         op->o_conn->c_n_ops_executing++;
1702         op->o_conn->c_n_ops_completed--;
1703         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1704         so->s_flags |= PS_IS_DETACHED;
1705         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1706 }
1707
1708 static int
1709 syncprov_search_response( Operation *op, SlapReply *rs )
1710 {
1711         searchstate *ss = op->o_callback->sc_private;
1712         slap_overinst *on = ss->ss_on;
1713         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1714
1715         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1716                 Attribute *a;
1717                 /* If we got a referral without a referral object, there's
1718                  * something missing that we cannot replicate. Just ignore it.
1719                  * The consumer will abort because we didn't send the expected
1720                  * control.
1721                  */
1722                 if ( !rs->sr_entry ) {
1723                         assert( rs->sr_entry != NULL );
1724                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1725                         return SLAP_CB_CONTINUE;
1726                 }
1727                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1728                 if ( a ) {
1729                         /* Make sure entry is less than the snaphot'd contextCSN */
1730                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1731                                 return LDAP_SUCCESS;
1732
1733                         /* Don't send the ctx entry twice */
1734                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1735                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1736                                 return LDAP_SUCCESS;
1737                 }
1738                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1739                         op->o_tmpmemctx );
1740                 rs->sr_ctrls[1] = NULL;
1741                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1742                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1743         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1744                 struct berval cookie;
1745
1746                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1747                         srs->sr_state.rid );
1748
1749                 /* Is this a regular refresh? */
1750                 if ( !ss->ss_so ) {
1751                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1752                                 op->o_tmpmemctx );
1753                         rs->sr_ctrls[1] = NULL;
1754                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1755                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1756                                         LDAP_SYNC_REFRESH_DELETES );
1757                 } else {
1758                         int locked = 0;
1759                 /* It's RefreshAndPersist, transition to Persist phase */
1760                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1761                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1762                                 &cookie, 1, NULL, 0 );
1763                         /* Flush any queued persist messages */
1764                         if ( ss->ss_so->s_res ) {
1765                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1766                                 locked = 1;
1767                                 syncprov_qplay( op, on, ss->ss_so );
1768                         }
1769
1770                         /* Turn off the refreshing flag */
1771                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1772                         if ( locked )
1773                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1774
1775                         /* Detach this Op from frontend control */
1776                         syncprov_detach_op( op, ss->ss_so );
1777
1778                         return LDAP_SUCCESS;
1779                 }
1780         }
1781
1782         return SLAP_CB_CONTINUE;
1783 }
1784
1785 static int
1786 syncprov_op_search( Operation *op, SlapReply *rs )
1787 {
1788         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1789         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1790         slap_callback   *cb;
1791         int gotstate = 0, nochange = 0, do_present = 1;
1792         syncops *sop = NULL;
1793         searchstate *ss;
1794         sync_control *srs;
1795         struct berval ctxcsn;
1796         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1797
1798         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1799
1800         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1801                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1802                 return rs->sr_err;
1803         }
1804
1805         srs = op->o_controls[slap_cids.sc_LDAPsync];
1806         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1807
1808         /* If this is a persistent search, set it up right away */
1809         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1810                 syncops so = {0};
1811                 fbase_cookie fc;
1812                 opcookie opc;
1813                 slap_callback sc;
1814
1815                 fc.fss = &so;
1816                 fc.fbase = 0;
1817                 so.s_eid = NOID;
1818                 so.s_op = op;
1819                 so.s_flags = PS_IS_REFRESHING;
1820                 /* syncprov_findbase expects to be called as a callback... */
1821                 sc.sc_private = &opc;
1822                 opc.son = on;
1823                 cb = op->o_callback;
1824                 op->o_callback = &sc;
1825                 rs->sr_err = syncprov_findbase( op, &fc );
1826                 op->o_callback = cb;
1827
1828                 if ( rs->sr_err != LDAP_SUCCESS ) {
1829                         send_ldap_result( op, rs );
1830                         return rs->sr_err;
1831                 }
1832                 sop = ch_malloc( sizeof( syncops ));
1833                 *sop = so;
1834                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1835                 sop->s_rid = srs->sr_state.rid;
1836                 sop->s_inuse = 1;
1837
1838                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1839                 sop->s_next = si->si_ops;
1840                 si->si_ops = sop;
1841                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1842         }
1843
1844         /* snapshot the ctxcsn */
1845         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1846         strcpy( csnbuf, si->si_ctxcsnbuf );
1847         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1848         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1849         ctxcsn.bv_val = csnbuf;
1850
1851         /* If we have a cookie, handle the PRESENT lookups */
1852         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1853                 sessionlog *sl;
1854
1855                 /* The cookie was validated when it was parsed, just use it */
1856
1857                 /* If just Refreshing and nothing has changed, shortcut it */
1858                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1859                         nochange = 1;
1860                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1861                                 LDAPControl     *ctrls[2];
1862
1863                                 ctrls[0] = NULL;
1864                                 ctrls[1] = NULL;
1865                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1866                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1867                                 rs->sr_ctrls = ctrls;
1868                                 rs->sr_err = LDAP_SUCCESS;
1869                                 send_ldap_result( op, rs );
1870                                 rs->sr_ctrls = NULL;
1871                                 return rs->sr_err;
1872                         }
1873                         goto shortcut;
1874                 }
1875                 /* Do we have a sessionlog for this search? */
1876                 sl=si->si_logs;
1877                 if ( sl ) {
1878                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1879                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1880                                 do_present = 0;
1881                                 /* mutex is unlocked in playlog */
1882                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1883                         } else {
1884                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1885                         }
1886                 }
1887                 /* Is the CSN still present in the database? */
1888                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1889                         /* No, so a reload is required */
1890 #if 0           /* the consumer doesn't seem to send this hint */
1891                         if ( op->o_sync_rhint == 0 ) {
1892                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1893                                 return rs->sr_err;
1894                         }
1895 #endif
1896                 } else {
1897                         gotstate = 1;
1898                         /* If changed and doing Present lookup, send Present UUIDs */
1899                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1900                                 LDAP_SUCCESS ) {
1901                                 send_ldap_result( op, rs );
1902                                 return rs->sr_err;
1903                         }
1904                 }
1905         }
1906
1907 shortcut:
1908         /* Append CSN range to search filter, save original filter
1909          * for persistent search evaluation
1910          */
1911         if ( sop ) {
1912                 sop->s_filterstr= op->ors_filterstr;
1913         }
1914
1915         /* If something changed, find the changes */
1916         if ( gotstate && !nochange ) {
1917                 Filter *fand, *fava;
1918
1919                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1920                 fand->f_choice = LDAP_FILTER_AND;
1921                 fand->f_next = NULL;
1922                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1923                 fand->f_and = fava;
1924                 fava->f_choice = LDAP_FILTER_GE;
1925                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1926                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1927 #ifdef LDAP_COMP_MATCH
1928                 fava->f_ava->aa_cf = NULL;
1929 #endif
1930                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1931                 fava->f_next = op->ors_filter;
1932                 op->ors_filter = fand;
1933                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1934         }
1935
1936         /* Let our callback add needed info to returned entries */
1937         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1938         ss = (searchstate *)(cb+1);
1939         ss->ss_on = on;
1940         ss->ss_so = sop;
1941         ss->ss_present = do_present;
1942         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
1943         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
1944         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
1945         cb->sc_response = syncprov_search_response;
1946         cb->sc_cleanup = syncprov_search_cleanup;
1947         cb->sc_private = ss;
1948         cb->sc_next = op->o_callback;
1949         op->o_callback = cb;
1950
1951 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1952         op->o_sync_mode &= SLAP_CONTROL_MASK;
1953 #endif
1954
1955         /* If this is a persistent search and no changes were reported during
1956          * the refresh phase, just invoke the response callback to transition
1957          * us into persist phase
1958          */
1959         if ( nochange ) {
1960                 rs->sr_err = LDAP_SUCCESS;
1961                 rs->sr_nentries = 0;
1962                 send_ldap_result( op, rs );
1963                 return rs->sr_err;
1964         }
1965         return SLAP_CB_CONTINUE;
1966 }
1967
1968 static int
1969 syncprov_operational(
1970         Operation *op,
1971         SlapReply *rs )
1972 {
1973         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1974         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1975
1976         if ( rs->sr_entry &&
1977                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1978
1979                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1980                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1981                         Attribute *a, **ap = NULL;
1982
1983                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1984                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1985                                         break;
1986                         }
1987
1988                         if ( !a ) {
1989                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1990
1991                                 a = ch_malloc( sizeof(Attribute));
1992                                 a->a_desc = slap_schema.si_ad_contextCSN;
1993                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1994                                 a->a_vals[1].bv_val = NULL;
1995                                 a->a_nvals = a->a_vals;
1996                                 a->a_next = NULL;
1997                                 a->a_flags = 0;
1998                                 *ap = a;
1999                         }
2000
2001                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2002                         if ( !ap ) {
2003                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2004                         } else {
2005                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2006                         }
2007                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2008                 }
2009         }
2010         return SLAP_CB_CONTINUE;
2011 }
2012
2013 enum {
2014         SP_CHKPT = 1,
2015         SP_SESSL
2016 };
2017
2018 static ConfigDriver sp_cf_gen;
2019
2020 static ConfigTable spcfg[] = {
2021         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2022                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2023                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2024                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2025         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2026                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2027                         "DESC 'Session log size in ops' "
2028                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2029         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2030 };
2031
2032 static ConfigOCs spocs[] = {
2033         { "( OLcfgOvOc:1.1 "
2034                 "NAME 'olcSyncProvConfig' "
2035                 "DESC 'SyncRepl Provider configuration' "
2036                 "SUP olcOverlayConfig "
2037                 "MAY ( olcSpCheckpoint $ olcSpSessionlog ) )",
2038                         Cft_Overlay, spcfg },
2039         { NULL, 0, NULL }
2040 };
2041
2042 static int
2043 sp_cf_gen(ConfigArgs *c)
2044 {
2045         slap_overinst           *on = (slap_overinst *)c->bi;
2046         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2047         int rc = 0;
2048
2049         if ( c->op == SLAP_CONFIG_EMIT ) {
2050                 switch ( c->type ) {
2051                 case SP_CHKPT:
2052                         if ( si->si_chkops || si->si_chktime ) {
2053                                 struct berval bv;
2054                                 bv.bv_len = sprintf( c->msg, "%d %d",
2055                                         si->si_chkops, si->si_chktime );
2056                                 bv.bv_val = c->msg;
2057                                 value_add_one( &c->rvalue_vals, &bv );
2058                         } else {
2059                                 rc = 1;
2060                         }
2061                         break;
2062                 case SP_SESSL:
2063                         if ( si->si_logs ) {
2064                                 c->value_int = si->si_logs->sl_size;
2065                         } else {
2066                                 rc = 1;
2067                         }
2068                         break;
2069                 }
2070                 return rc;
2071         } else if ( c->op == LDAP_MOD_DELETE ) {
2072                 switch ( c->type ) {
2073                 case SP_CHKPT:
2074                         si->si_chkops = 0;
2075                         si->si_chktime = 0;
2076                         break;
2077                 case SP_SESSL:
2078                         if ( si->si_logs )
2079                                 si->si_logs->sl_size = 0;
2080                         else
2081                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2082                         break;
2083                 }
2084                 return rc;
2085         }
2086         switch ( c->type ) {
2087         case SP_CHKPT:
2088                 si->si_chkops = atoi( c->argv[1] );
2089                 si->si_chktime = atoi( c->argv[2] ) * 60;
2090                 break;
2091         case SP_SESSL: {
2092                 sessionlog *sl;
2093                 int size = c->value_int;
2094
2095                 if ( size < 0 ) {
2096                         sprintf( c->msg, "%s size %d is negative",
2097                                 c->argv[0], size );
2098                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2099                         return ARG_BAD_CONF;
2100                 }
2101                 sl = si->si_logs;
2102                 if ( !sl ) {
2103                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2104                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2105                         sl->sl_mincsn.bv_len = 0;
2106                         sl->sl_num = 0;
2107                         sl->sl_head = sl->sl_tail = NULL;
2108                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2109                         si->si_logs = sl;
2110                 }
2111                 sl->sl_size = size;
2112                 }
2113                 break;
2114         }
2115         return rc;
2116 }
2117
2118 /* ITS#3456 we cannot run this search on the main thread, must use a
2119  * child thread in order to insure we have a big enough stack.
2120  */
2121 static void *
2122 syncprov_db_otask(
2123         void *ptr
2124 )
2125 {
2126         syncprov_findcsn( ptr, FIND_MAXCSN );
2127         return NULL;
2128 }
2129
2130 /* Read any existing contextCSN from the underlying db.
2131  * Then search for any entries newer than that. If no value exists,
2132  * just generate it. Cache whatever result.
2133  */
2134 static int
2135 syncprov_db_open(
2136     BackendDB *be
2137 )
2138 {
2139         slap_overinst   *on = (slap_overinst *) be->bd_info;
2140         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2141
2142         Connection conn;
2143         char opbuf[OPERATION_BUFFER_SIZE];
2144         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2145         Operation *op = (Operation *)opbuf;
2146         Entry *e;
2147         Attribute *a;
2148         int rc;
2149         void *thrctx = NULL;
2150
2151         if ( slapMode & SLAP_TOOL_MODE ) {
2152                 return 0;
2153         }
2154
2155         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2156         if ( rc ) {
2157                 return rc;
2158         }
2159
2160         thrctx = ldap_pvt_thread_pool_context();
2161         connection_fake_init( &conn, op, thrctx );
2162         op->o_bd = be;
2163         op->o_dn = be->be_rootdn;
2164         op->o_ndn = be->be_rootndn;
2165
2166         ctxcsnbuf[0] = '\0';
2167
2168         op->o_bd->bd_info = on->on_info->oi_orig;
2169         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2170                 slap_schema.si_ad_contextCSN, 0, &e );
2171
2172         if ( e ) {
2173                 ldap_pvt_thread_t tid;
2174
2175                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2176                 if ( a ) {
2177                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2178                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2179                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2180                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2181                                 si->si_ctxcsn.bv_len );
2182                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2183                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2184                 }
2185                 be_entry_release_rw( op, e, 0 );
2186                 op->o_bd->bd_info = (BackendInfo *)on;
2187                 op->o_req_dn = be->be_suffix[0];
2188                 op->o_req_ndn = be->be_nsuffix[0];
2189                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2190                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2191                 ldap_pvt_thread_join( tid, NULL );
2192         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2193                 /* If we're also a consumer, and we didn't find the context entry,
2194                  * then don't generate anything, wait for our provider to send it
2195                  * to us.
2196                  */
2197                 goto out;
2198         }
2199
2200         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2201                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2202                                 &si->si_ctxcsn, 0 );
2203         }
2204
2205         /* If our ctxcsn is different from what was read from the root
2206          * entry, make sure we do a checkpoint on close
2207          */
2208         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2209                 si->si_numops++;
2210         }
2211
2212 out:
2213         op->o_bd->bd_info = (BackendInfo *)on;
2214         ldap_pvt_thread_pool_context_reset( thrctx );
2215         return 0;
2216 }
2217
2218 /* Write the current contextCSN into the underlying db.
2219  */
2220 static int
2221 syncprov_db_close(
2222     BackendDB *be
2223 )
2224 {
2225     slap_overinst   *on = (slap_overinst *) be->bd_info;
2226     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2227
2228         if ( slapMode & SLAP_TOOL_MODE ) {
2229                 return 0;
2230         }
2231         if ( si->si_numops ) {
2232                 Connection conn;
2233                 char opbuf[OPERATION_BUFFER_SIZE];
2234                 Operation *op = (Operation *)opbuf;
2235                 SlapReply rs = {REP_RESULT};
2236                 void *thrctx;
2237
2238                 thrctx = ldap_pvt_thread_pool_context();
2239                 connection_fake_init( &conn, op, thrctx );
2240                 op->o_bd = be;
2241                 op->o_dn = be->be_rootdn;
2242                 op->o_ndn = be->be_rootndn;
2243                 syncprov_checkpoint( op, &rs, on );
2244                 ldap_pvt_thread_pool_context_reset( thrctx );
2245         }
2246
2247     return 0;
2248 }
2249
2250 static int
2251 syncprov_db_init(
2252         BackendDB *be
2253 )
2254 {
2255         slap_overinst   *on = (slap_overinst *)be->bd_info;
2256         syncprov_info_t *si;
2257
2258         si = ch_calloc(1, sizeof(syncprov_info_t));
2259         on->on_bi.bi_private = si;
2260         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2261         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2262         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2263         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2264
2265         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2266         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2267         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2268         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2269
2270         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2271         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2272
2273         return 0;
2274 }
2275
2276 static int
2277 syncprov_db_destroy(
2278         BackendDB *be
2279 )
2280 {
2281         slap_overinst   *on = (slap_overinst *)be->bd_info;
2282         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2283
2284         if ( si ) {
2285                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2286                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2287                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2288                 ch_free( si );
2289         }
2290
2291         return 0;
2292 }
2293
2294 static int syncprov_parseCtrl (
2295         Operation *op,
2296         SlapReply *rs,
2297         LDAPControl *ctrl )
2298 {
2299         ber_tag_t tag;
2300         BerElementBuffer berbuf;
2301         BerElement *ber = (BerElement *)&berbuf;
2302         ber_int_t mode;
2303         ber_len_t len;
2304         struct berval cookie = BER_BVNULL;
2305         sync_control *sr;
2306         int rhint = 0;
2307
2308         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2309                 rs->sr_text = "Sync control specified multiple times";
2310                 return LDAP_PROTOCOL_ERROR;
2311         }
2312
2313         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2314                 rs->sr_text = "Sync control specified with pagedResults control";
2315                 return LDAP_PROTOCOL_ERROR;
2316         }
2317
2318         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2319                 rs->sr_text = "Sync control value is empty (or absent)";
2320                 return LDAP_PROTOCOL_ERROR;
2321         }
2322
2323         /* Parse the control value
2324          *      syncRequestValue ::= SEQUENCE {
2325          *              mode   ENUMERATED {
2326          *                      -- 0 unused
2327          *                      refreshOnly             (1),
2328          *                      -- 2 reserved
2329          *                      refreshAndPersist       (3)
2330          *              },
2331          *              cookie  syncCookie OPTIONAL
2332          *      }
2333          */
2334
2335         ber_init2( ber, &ctrl->ldctl_value, 0 );
2336
2337         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2338                 rs->sr_text = "Sync control : mode decoding error";
2339                 return LDAP_PROTOCOL_ERROR;
2340         }
2341
2342         switch( mode ) {
2343         case LDAP_SYNC_REFRESH_ONLY:
2344                 mode = SLAP_SYNC_REFRESH;
2345                 break;
2346         case LDAP_SYNC_REFRESH_AND_PERSIST:
2347                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2348                 break;
2349         default:
2350                 rs->sr_text = "Sync control : unknown update mode";
2351                 return LDAP_PROTOCOL_ERROR;
2352         }
2353
2354         tag = ber_peek_tag( ber, &len );
2355
2356         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2357                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2358                         rs->sr_text = "Sync control : cookie decoding error";
2359                         return LDAP_PROTOCOL_ERROR;
2360                 }
2361         }
2362         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2363                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2364                         rs->sr_text = "Sync control : rhint decoding error";
2365                         return LDAP_PROTOCOL_ERROR;
2366                 }
2367         }
2368         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2369                         rs->sr_text = "Sync control : decoding error";
2370                         return LDAP_PROTOCOL_ERROR;
2371         }
2372         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2373         sr->sr_rhint = rhint;
2374         if (!BER_BVISNULL(&cookie)) {
2375                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2376                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2377                 if ( sr->sr_state.rid == -1 ) {
2378                         rs->sr_text = "Sync control : cookie parsing error";
2379                         return LDAP_PROTOCOL_ERROR;
2380                 }
2381         }
2382
2383         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2384
2385         op->o_sync = ctrl->ldctl_iscritical
2386                 ? SLAP_CONTROL_CRITICAL
2387                 : SLAP_CONTROL_NONCRITICAL;
2388
2389         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2390
2391         return LDAP_SUCCESS;
2392 }
2393
2394 /* This overlay is set up for dynamic loading via moduleload. For static
2395  * configuration, you'll need to arrange for the slap_overinst to be
2396  * initialized and registered by some other function inside slapd.
2397  */
2398
2399 static slap_overinst            syncprov;
2400
2401 int
2402 syncprov_init()
2403 {
2404         int rc;
2405
2406         rc = register_supported_control( LDAP_CONTROL_SYNC,
2407                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2408                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2409         if ( rc != LDAP_SUCCESS ) {
2410                 Debug( LDAP_DEBUG_ANY,
2411                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2412                 return rc;
2413         }
2414
2415         syncprov.on_bi.bi_type = "syncprov";
2416         syncprov.on_bi.bi_db_init = syncprov_db_init;
2417         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2418         syncprov.on_bi.bi_db_open = syncprov_db_open;
2419         syncprov.on_bi.bi_db_close = syncprov_db_close;
2420
2421         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2422         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2423
2424         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2425         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2426         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2427         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2428         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2429         syncprov.on_bi.bi_op_search = syncprov_op_search;
2430         syncprov.on_bi.bi_extended = syncprov_op_extended;
2431         syncprov.on_bi.bi_operational = syncprov_operational;
2432
2433         syncprov.on_bi.bi_cf_ocs = spocs;
2434
2435         rc = config_register_schema( spcfg, spocs );
2436         if ( rc ) return rc;
2437
2438         return overlay_register( &syncprov );
2439 }
2440
2441 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2442 int
2443 init_module( int argc, char *argv[] )
2444 {
2445         return syncprov_init();
2446 }
2447 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2448
2449 #endif /* defined(SLAPD_OVER_SYNCPROV) */