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 2004-2008 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         opcookie *opc = op->o_callback->sc_private;
 397         slap_overinst *on = opc->son;
 398
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 int rc;
 408
 409                 fc->fss->s_flags ^= PS_FIND_BASE;
 410                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 411
 412                 fop = *fc->fss->s_op;
 413
 414                 fop.o_bd = fop.o_bd->bd_self;
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_time = op->o_time;
 417                 fop.o_tincr = op->o_tincr;
 418
 419                 cb.sc_response = findbase_cb;
 420                 cb.sc_private = fc;
 421
 422                 fop.o_sync_mode = 0;    /* turn off sync mode */
 423                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 424                 fop.o_callback = &cb;
 425                 fop.o_tag = LDAP_REQ_SEARCH;
 426                 fop.ors_scope = LDAP_SCOPE_BASE;
 427                 fop.ors_limit = NULL;
 428                 fop.ors_slimit = 1;
 429                 fop.ors_tlimit = SLAP_NO_LIMIT;
 430                 fop.ors_attrs = slap_anlist_no_attrs;
 431                 fop.ors_attrsonly = 1;
 432                 fop.ors_filter = &generic_filter;
 433                 fop.ors_filterstr = generic_filterstr;
 434
 435                 rc = fop.o_bd->be_search( &fop, &frs );
 436         } else {
 437                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 438                 fc->fbase = 1;
 439         }
 440
 441         /* After the first call, see if the fdn resides in the scope */
 442         if ( fc->fbase == 1 ) {
 443                 switch ( fc->fss->s_op->ors_scope ) {
 444                 case LDAP_SCOPE_BASE:
 445                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 446                         break;
 447                 case LDAP_SCOPE_ONELEVEL: {
 448                         struct berval pdn;
 449                         dnParent( fc->fdn, &pdn );
 450                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 451                         break; }
 452                 case LDAP_SCOPE_SUBTREE:
 453                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 454                         break;
 455                 case LDAP_SCOPE_SUBORDINATE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 457                                 !dn_match( fc->fdn, &fc->fss->s_base );
 458                         break;
 459                 }
 460         }
 461
 462         if ( fc->fbase )
 463                 return LDAP_SUCCESS;
 464
 465         /* If entryID has changed, then the base of this search has
 466          * changed. Invalidate the psearch.
 467          */
 468         return LDAP_NO_SUCH_OBJECT;
 469 }
 470
 471 /* syncprov_findcsn:
 472  *   This function has three different purposes, but they all use a search
 473  * that filters on entryCSN so they're combined here.
 474  * 1: at startup time, after a contextCSN has been read from the database,
 475  * we search for all entries with CSN >= contextCSN in case the contextCSN
 476  * was not checkpointed at the previous shutdown.
 477  *
 478  * 2: when the current contextCSN is known and we have a sync cookie, we search
 479  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 480  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 481  *
 482  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 483  * CSN, and generate Present records for them. We always collect this result
 484  * in SyncID sets, even if there's only one match.
 485  */
 486 typedef enum find_csn_t {
 487         FIND_MAXCSN     = 1,
 488         FIND_CSN        = 2,
 489         FIND_PRESENT    = 3
 490 } find_csn_t;
 491
 492 static int
 493 findmax_cb( Operation *op, SlapReply *rs )
 494 {
 495         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 496                 struct berval *maxcsn = op->o_callback->sc_private;
 497                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 498                         slap_schema.si_ad_entryCSN );
 499
 500                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 501                         maxcsn->bv_len = a->a_vals[0].bv_len;
 502                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 503                 }
 504         }
 505         return LDAP_SUCCESS;
 506 }
 507
 508 static int
 509 findcsn_cb( Operation *op, SlapReply *rs )
 510 {
 511         slap_callback *sc = op->o_callback;
 512
 513         /* We just want to know that at least one exists, so it's OK if
 514          * we exceed the unchecked limit.
 515          */
 516         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 517                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 518                 sc->sc_private = (void *)1;
 519         }
 520         return LDAP_SUCCESS;
 521 }
 522
 523 /* Build a list of entryUUIDs for sending in a SyncID set */
 524
 525 #define UUID_LEN        16
 526
 527 typedef struct fpres_cookie {
 528         int num;
 529         BerVarray uuids;
 530         char *last;
 531 } fpres_cookie;
 532
 533 static int
 534 findpres_cb( Operation *op, SlapReply *rs )
 535 {
 536         slap_callback *sc = op->o_callback;
 537         fpres_cookie *pc = sc->sc_private;
 538         Attribute *a;
 539         int ret = SLAP_CB_CONTINUE;
 540
 541         switch ( rs->sr_type ) {
 542         case REP_SEARCH:
 543                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 544                 if ( a ) {
 545                         pc->uuids[pc->num].bv_val = pc->last;
 546                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 547                                 pc->uuids[pc->num].bv_len );
 548                         pc->num++;
 549                         pc->last = pc->uuids[pc->num].bv_val;
 550                         pc->uuids[pc->num].bv_val = NULL;
 551                 }
 552                 ret = LDAP_SUCCESS;
 553                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 554                         break;
 555                 /* FALLTHRU */
 556         case REP_RESULT:
 557                 ret = rs->sr_err;
 558                 if ( pc->num ) {
 559                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 560                                 0, pc->uuids, 0 );
 561                         pc->uuids[pc->num].bv_val = pc->last;
 562                         pc->num = 0;
 563                         pc->last = pc->uuids[0].bv_val;
 564                 }
 565                 break;
 566         default:
 567                 break;
 568         }
 569         return ret;
 570 }
 571
 572 static int
 573 syncprov_findcsn( Operation *op, find_csn_t mode )
 574 {
 575         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 576         syncprov_info_t         *si = on->on_bi.bi_private;
 577
 578         slap_callback cb = {0};
 579         Operation fop;
 580         SlapReply frs = { REP_RESULT };
 581         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 582         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 583         struct berval maxcsn;
 584         Filter cf;
 585         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 586         fpres_cookie pcookie;
 587         sync_control *srs = NULL;
 588         struct slap_limits_set fc_limits;
 589         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 590         int maxid = 0;
 591
 592         if ( mode != FIND_MAXCSN ) {
 593                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 594         }
 595
 596         fop = *op;
 597         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 598         /* We want pure entries, not referrals */
 599         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 600
 601         cf.f_ava = &eq;
 602         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 603         BER_BVZERO( &cf.f_av_value );
 604         cf.f_next = NULL;
 605
 606         fop.o_callback = &cb;
 607         fop.ors_limit = NULL;
 608         fop.ors_tlimit = SLAP_NO_LIMIT;
 609         fop.ors_filter = &cf;
 610         fop.ors_filterstr.bv_val = buf;
 611
 612 again:
 613         switch( mode ) {
 614         case FIND_MAXCSN:
 615                 cf.f_choice = LDAP_FILTER_GE;
 616                 cf.f_av_value = si->si_ctxcsn[0];
 617                 /* If there are multiple CSNs, use the largest */
 618                 for ( i=1; i<si->si_numcsns; i++) {
 619                         if ( ber_bvcmp( &cf.f_av_value, &si->si_ctxcsn[i] ) < 0 ) {
 620                                 cf.f_av_value = si->si_ctxcsn[i];
 621                                 maxid = i;
 622                         }
 623                 }
 624                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 625                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 626                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 627                         return LDAP_OTHER;
 628                 }
 629                 fop.ors_attrsonly = 0;
 630                 fop.ors_attrs = csn_anlist;
 631                 fop.ors_slimit = SLAP_NO_LIMIT;
 632                 cb.sc_private = &maxcsn;
 633                 cb.sc_response = findmax_cb;
 634                 strcpy( cbuf, cf.f_av_value.bv_val );
 635                 maxcsn.bv_val = cbuf;
 636                 maxcsn.bv_len = cf.f_av_value.bv_len;
 637                 break;
 638         case FIND_CSN:
 639                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 640                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 641                         /* If there are multiple CSNs, use the smallest */
 642                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 643                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 644                                         > 0 ) {
 645                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 646                                 }
 647                         }
 648                 }
 649                 /* Look for exact match the first time */
 650                 if ( findcsn_retry ) {
 651                         cf.f_choice = LDAP_FILTER_EQUALITY;
 652                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 653                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 654                 /* On retry, look for <= */
 655                 } else {
 656                         cf.f_choice = LDAP_FILTER_LE;
 657                         fop.ors_limit = &fc_limits;
 658                         memset( &fc_limits, 0, sizeof( fc_limits ));
 659                         fc_limits.lms_s_unchecked = 1;
 660                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 661                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 662                 }
 663                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 664                         return LDAP_OTHER;
 665                 }
 666                 fop.ors_attrsonly = 1;
 667                 fop.ors_attrs = slap_anlist_no_attrs;
 668                 fop.ors_slimit = 1;
 669                 cb.sc_private = NULL;
 670                 cb.sc_response = findcsn_cb;
 671                 break;
 672         case FIND_PRESENT:
 673                 fop.ors_filter = op->ors_filter;
 674                 fop.ors_filterstr = op->ors_filterstr;
 675                 fop.ors_attrsonly = 0;
 676                 fop.ors_attrs = uuid_anlist;
 677                 fop.ors_slimit = SLAP_NO_LIMIT;
 678                 cb.sc_private = &pcookie;
 679                 cb.sc_response = findpres_cb;
 680                 pcookie.num = 0;
 681
 682                 /* preallocate storage for a full set */
 683                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 684                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 685                         op->o_tmpmemctx );
 686                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 687                 pcookie.uuids[0].bv_val = pcookie.last;
 688                 pcookie.uuids[0].bv_len = UUID_LEN;
 689                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 690                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 691                         pcookie.uuids[i].bv_len = UUID_LEN;
 692                 }
 693                 break;
 694         }
 695
 696         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 697         fop.o_bd->be_search( &fop, &frs );
 698         fop.o_bd->bd_info = (BackendInfo *)on;
 699
 700         switch( mode ) {
 701         case FIND_MAXCSN:
 702                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 703                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 704                         si->si_numops++;        /* ensure a checkpoint */
 705                 }
 706                 break;
 707         case FIND_CSN:
 708                 /* If matching CSN was not found, invalidate the context. */
 709                 if ( !cb.sc_private ) {
 710                         /* If we didn't find an exact match, then try for <= */
 711                         if ( findcsn_retry ) {
 712                                 findcsn_retry = 0;
 713                                 goto again;
 714                         }
 715                         rc = LDAP_NO_SUCH_OBJECT;
 716                 }
 717                 break;
 718         case FIND_PRESENT:
 719                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 720                 break;
 721         }
 722
 723         return rc;
 724 }
 725
 726 static void
 727 syncprov_free_syncop( syncops *so )
 728 {
 729         syncres *sr, *srnext;
 730         GroupAssertion *ga, *gnext;
 731
 732         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 733         if ( --so->s_inuse > 0 ) {
 734                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 735                 return;
 736         }
 737         if ( so->s_qtask ) {
 738                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 739                 if ( ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) )
 740                         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 741                 ldap_pvt_runqueue_remove( &slapd_rq, so->s_qtask );
 742                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 743         }
 744         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 745         if ( so->s_flags & PS_IS_DETACHED ) {
 746                 filter_free( so->s_op->ors_filter );
 747                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 748                         gnext = ga->ga_next;
 749                         ch_free( ga );
 750                 }
 751                 ch_free( so->s_op );
 752         }
 753         ch_free( so->s_base.bv_val );
 754         for ( sr=so->s_res; sr; sr=srnext ) {
 755                 srnext = sr->s_next;
 756                 ch_free( sr );
 757         }
 758         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 759         ch_free( so );
 760 }
 761
 762 /* Send a persistent search response */
 763 static int
 764 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 765         Entry **e, int mode )
 766 {
 767         slap_overinst *on = opc->son;
 768
 769         SlapReply rs = { REP_SEARCH };
 770         LDAPControl *ctrls[2];
 771         struct berval cookie, csns[2];
 772         Entry e_uuid = {0};
 773         Attribute a_uuid = {0};
 774
 775         if ( so->s_op->o_abandon )
 776                 return SLAPD_ABANDON;
 777
 778         ctrls[1] = NULL;
 779         csns[0] = opc->sctxcsn;
 780         BER_BVZERO( &csns[1] );
 781         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 782
 783         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 784
 785         e_uuid.e_attrs = &a_uuid;
 786         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 787         a_uuid.a_nvals = &opc->suuid;
 788         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 789                 mode, ctrls, 0, 1, &cookie );
 790         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 791
 792         rs.sr_ctrls = ctrls;
 793         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 794         switch( mode ) {
 795         case LDAP_SYNC_ADD:
 796                 rs.sr_entry = *e;
 797                 if ( rs.sr_entry->e_private )
 798                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 799                 if ( opc->sreference ) {
 800                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 801                         rs.sr_err = send_search_reference( op, &rs );
 802                         ber_bvarray_free( rs.sr_ref );
 803                         if ( !rs.sr_entry )
 804                                 *e = NULL;
 805                         break;
 806                 }
 807                 /* fallthru */
 808         case LDAP_SYNC_MODIFY:
 809                 rs.sr_entry = *e;
 810                 if ( rs.sr_entry->e_private )
 811                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 812                 rs.sr_attrs = op->ors_attrs;
 813                 rs.sr_err = send_search_entry( op, &rs );
 814                 if ( !rs.sr_entry )
 815                         *e = NULL;
 816                 break;
 817         case LDAP_SYNC_DELETE:
 818                 e_uuid.e_attrs = NULL;
 819                 e_uuid.e_name = opc->sdn;
 820                 e_uuid.e_nname = opc->sndn;
 821                 rs.sr_entry = &e_uuid;
 822                 if ( opc->sreference ) {
 823                         struct berval bv = BER_BVNULL;
 824                         rs.sr_ref = &bv;
 825                         rs.sr_err = send_search_reference( op, &rs );
 826                 } else {
 827                         rs.sr_err = send_search_entry( op, &rs );
 828                 }
 829                 break;
 830         default:
 831                 assert(0);
 832         }
 833         /* In case someone else freed it already? */
 834         if ( rs.sr_ctrls ) {
 835                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 836                 rs.sr_ctrls = NULL;
 837         }
 838
 839         return rs.sr_err;
 840 }
 841
 842 /* Play back queued responses */
 843 static int
 844 syncprov_qplay( Operation *op, struct re_s *rtask )
 845 {
 846         syncops *so = rtask->arg;
 847         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 848         syncres *sr;
 849         Entry *e;
 850         opcookie opc;
 851         int rc = 0;
 852
 853         opc.son = on;
 854
 855         for (;;) {
 856                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 857                 sr = so->s_res;
 858                 if ( sr )
 859                         so->s_res = sr->s_next;
 860                 if ( !so->s_res )
 861                         so->s_restail = NULL;
 862                 /* Exit loop with mutex held */
 863                 if ( !sr || so->s_op->o_abandon )
 864                         break;
 865                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 866
 867                 opc.sdn = sr->s_dn;
 868                 opc.sndn = sr->s_ndn;
 869                 opc.suuid = sr->s_uuid;
 870                 opc.sctxcsn = sr->s_csn;
 871                 opc.sreference = sr->s_isreference;
 872                 e = NULL;
 873
 874                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 875                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 876                         if ( rc ) {
 877                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 878                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 879                                 ch_free( sr );
 880                                 rc = 0;
 881                                 continue;
 882                         }
 883                 }
 884                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 885
 886                 if ( e ) {
 887                         overlay_entry_release_ov( op, e, 0, on );
 888                 }
 889
 890                 ch_free( sr );
 891
 892                 if ( rc ) {
 893                         /* Exit loop with mutex held */
 894                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 895                         break;
 896                 }
 897         }
 898
 899         /* wait until we get explicitly scheduled again */
 900         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 901         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 902         if ( rc == 0 ) {
 903                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 904         } else {
 905                 /* bail out on any error */
 906                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 907         }
 908         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 909         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 910         return rc;
 911 }
 912
 913 /* runqueue task for playing back queued responses */
 914 static void *
 915 syncprov_qtask( void *ctx, void *arg )
 916 {
 917         struct re_s *rtask = arg;
 918         syncops *so = rtask->arg;
 919         OperationBuffer opbuf;
 920         Operation *op;
 921         BackendDB be;
 922         int rc;
 923
 924         op = &opbuf.ob_op;
 925         *op = *so->s_op;
 926         op->o_hdr = &opbuf.ob_hdr;
 927         op->o_controls = opbuf.ob_controls;
 928         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 929
 930         *op->o_hdr = *so->s_op->o_hdr;
 931
 932         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 933         op->o_tmpmfuncs = &slap_sl_mfuncs;
 934         op->o_threadctx = ctx;
 935
 936         /* syncprov_qplay expects a fake db */
 937         be = *so->s_op->o_bd;
 938         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 939         op->o_bd = &be;
 940         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 941         op->o_callback = NULL;
 942
 943         rc = syncprov_qplay( op, rtask );
 944
 945         /* decrement use count... */
 946         syncprov_free_syncop( so );
 947
 948 #if 0   /* FIXME: connection_close isn't exported from slapd.
 949                  * should it be?
 950                  */
 951         if ( rc ) {
 952                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 953                 if ( connection_state_closing( op->o_conn )) {
 954                         connection_close( op->o_conn );
 955                 }
 956                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 957         }
 958 #endif
 959         return NULL;
 960 }
 961
 962 /* Start the task to play back queued psearch responses */
 963 static void
 964 syncprov_qstart( syncops *so )
 965 {
 966         int wake=0;
 967         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 968         if ( !so->s_qtask ) {
 969                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 970                         syncprov_qtask, so, "syncprov_qtask",
 971                         so->s_op->o_conn->c_peer_name.bv_val );
 972                 ++so->s_inuse;
 973                 wake = 1;
 974         } else {
 975                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 976                         !so->s_qtask->next_sched.tv_sec ) {
 977                         so->s_qtask->interval.tv_sec = 0;
 978                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 979                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 980                         ++so->s_inuse;
 981                         wake = 1;
 982                 }
 983         }
 984         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 985         if ( wake )
 986                 slap_wake_listener();
 987 }
 988
 989 /* Queue a persistent search response */
 990 static int
 991 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 992 {
 993         syncres *sr;
 994         int sid, srsize;
 995
 996         /* Don't send changes back to their originator */
 997         sid = slap_parse_csn_sid( &opc->sctxcsn );
 998         if ( sid >= 0 && sid == so->s_sid )
 999                 return LDAP_SUCCESS;
1000
1001         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1002                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1003         if ( opc->sctxcsn.bv_len )
1004                 srsize += opc->sctxcsn.bv_len + 1;
1005         sr = ch_malloc( srsize );
1006         sr->s_next = NULL;
1007         sr->s_dn.bv_val = (char *)(sr + 1);
1008         sr->s_dn.bv_len = opc->sdn.bv_len;
1009         sr->s_mode = mode;
1010         sr->s_isreference = opc->sreference;
1011         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1012                  opc->sdn.bv_val ) + 1;
1013         sr->s_ndn.bv_len = opc->sndn.bv_len;
1014         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1015                  opc->sndn.bv_val ) + 1;
1016         sr->s_uuid.bv_len = opc->suuid.bv_len;
1017         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1018         if ( opc->sctxcsn.bv_len ) {
1019                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1020                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1021         } else {
1022                 sr->s_csn.bv_val = NULL;
1023         }
1024         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1025
1026         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1027         if ( !so->s_res ) {
1028                 so->s_res = sr;
1029         } else {
1030                 so->s_restail->s_next = sr;
1031         }
1032         so->s_restail = sr;
1033
1034         /* If the base of the psearch was modified, check it next time round */
1035         if ( so->s_flags & PS_WROTE_BASE ) {
1036                 so->s_flags ^= PS_WROTE_BASE;
1037                 so->s_flags |= PS_FIND_BASE;
1038         }
1039         if ( so->s_flags & PS_IS_DETACHED ) {
1040                 syncprov_qstart( so );
1041         }
1042         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1043         return LDAP_SUCCESS;
1044 }
1045
1046 static int
1047 syncprov_drop_psearch( syncops *so, int lock )
1048 {
1049         if ( so->s_flags & PS_IS_DETACHED ) {
1050                 if ( lock )
1051                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1052                 so->s_op->o_conn->c_n_ops_executing--;
1053                 so->s_op->o_conn->c_n_ops_completed++;
1054                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1055                         o_next );
1056                 if ( lock )
1057                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1058         }
1059         syncprov_free_syncop( so );
1060
1061         return 0;
1062 }
1063
1064 static int
1065 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1066 {
1067         slap_callback *sc = op->o_callback;
1068         op->o_callback = sc->sc_next;
1069         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1070         op->o_tmpfree( sc, op->o_tmpmemctx );
1071         return 0;
1072 }
1073
1074 static int
1075 syncprov_op_abandon( Operation *op, SlapReply *rs )
1076 {
1077         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1078         syncprov_info_t         *si = on->on_bi.bi_private;
1079         syncops *so, *soprev;
1080
1081         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1082         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1083                 soprev=so, so=so->s_next ) {
1084                 if ( so->s_op->o_connid == op->o_connid &&
1085                         so->s_op->o_msgid == op->orn_msgid ) {
1086                                 so->s_op->o_abandon = 1;
1087                                 soprev->s_next = so->s_next;
1088                                 break;
1089                 }
1090         }
1091         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1092         if ( so ) {
1093                 /* Is this really a Cancel exop? */
1094                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1095                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1096                         rs->sr_err = LDAP_CANCELLED;
1097                         send_ldap_result( so->s_op, rs );
1098                         if ( so->s_flags & PS_IS_DETACHED ) {
1099                                 slap_callback *cb;
1100                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1101                                 cb->sc_cleanup = syncprov_ab_cleanup;
1102                                 cb->sc_next = op->o_callback;
1103                                 cb->sc_private = so;
1104                                 return SLAP_CB_CONTINUE;
1105                         }
1106                 }
1107                 syncprov_drop_psearch( so, 0 );
1108         }
1109         return SLAP_CB_CONTINUE;
1110 }
1111
1112 /* Find which persistent searches are affected by this operation */
1113 static void
1114 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1115 {
1116         slap_overinst *on = opc->son;
1117         syncprov_info_t         *si = on->on_bi.bi_private;
1118
1119         fbase_cookie fc;
1120         syncops *ss, *sprev, *snext;
1121         Entry *e = NULL;
1122         Attribute *a;
1123         int rc;
1124         struct berval newdn;
1125         int freefdn = 0;
1126         BackendDB *b0 = op->o_bd, db;
1127
1128         fc.fdn = &op->o_req_ndn;
1129         /* compute new DN */
1130         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1131                 struct berval pdn;
1132                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1133                 else dnParent( fc.fdn, &pdn );
1134                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1135                 fc.fdn = &newdn;
1136                 freefdn = 1;
1137         }
1138         if ( op->o_tag != LDAP_REQ_ADD ) {
1139                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1140                         db = *op->o_bd;
1141                         op->o_bd = &db;
1142                 }
1143                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1144                 /* If we're sending responses now, make a copy and unlock the DB */
1145                 if ( e && !saveit ) {
1146                         Entry *e2 = entry_dup( e );
1147                         overlay_entry_release_ov( op, e, 0, on );
1148                         e = e2;
1149                 }
1150                 if ( rc ) {
1151                         op->o_bd = b0;
1152                         return;
1153                 }
1154         } else {
1155                 e = op->ora_e;
1156         }
1157
1158         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1159                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1160                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1161                 opc->sreference = is_entry_referral( e );
1162                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1163                 if ( a )
1164                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1165         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1166                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1167                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1168                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1169                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1170         }
1171
1172         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1173         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1174                 sprev = ss, ss=snext)
1175         {
1176                 Operation op2;
1177                 syncmatches *sm;
1178                 int found = 0;
1179
1180                 snext = ss->s_next;
1181                 if ( ss->s_op->o_abandon )
1182                         continue;
1183
1184                 /* validate base */
1185                 fc.fss = ss;
1186                 fc.fbase = 0;
1187                 fc.fscope = 0;
1188
1189                 /* If the base of the search is missing, signal a refresh */
1190                 rc = syncprov_findbase( op, &fc );
1191                 if ( rc != LDAP_SUCCESS ) {
1192                         SlapReply rs = {REP_RESULT};
1193                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1194                                 "search base has changed" );
1195                         sprev->s_next = snext;
1196                         syncprov_drop_psearch( ss, 1 );
1197                         ss = sprev;
1198                         continue;
1199                 }
1200
1201
1202                 /* If we're sending results now, look for this op in old matches */
1203                 if ( !saveit ) {
1204                         syncmatches *old;
1205
1206                         /* Did we modify the search base? */
1207                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1208                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1209                                 ss->s_flags |= PS_WROTE_BASE;
1210                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1211                         }
1212
1213                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1214                                 old=sm, sm=sm->sm_next ) {
1215                                 if ( sm->sm_op == ss ) {
1216                                         found = 1;
1217                                         old->sm_next = sm->sm_next;
1218                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1219                                         break;
1220                                 }
1221                         }
1222                 }
1223
1224                 if ( fc.fscope ) {
1225                         op2 = *ss->s_op;
1226                         op2.o_hdr = op->o_hdr;
1227                         op2.o_extra = op->o_extra;
1228                 }
1229
1230                 /* check if current o_req_dn is in scope and matches filter */
1231                 if ( fc.fscope && test_filter( &op2, e, ss->s_op->ors_filter ) ==
1232                         LDAP_COMPARE_TRUE ) {
1233                         if ( saveit ) {
1234                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1235                                 sm->sm_next = opc->smatches;
1236                                 sm->sm_op = ss;
1237                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1238                                 ++ss->s_inuse;
1239                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1240                                 opc->smatches = sm;
1241                         } else {
1242                                 /* if found send UPDATE else send ADD */
1243                                 syncprov_qresp( opc, ss,
1244                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1245                         }
1246                 } else if ( !saveit && found ) {
1247                         /* send DELETE */
1248                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1249                 }
1250         }
1251         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1252
1253         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1254                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1255                         op->o_bd = &db;
1256                 }
1257                 overlay_entry_release_ov( op, e, 0, on );
1258                 op->o_bd = b0;
1259         }
1260         if ( freefdn ) {
1261                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1262         }
1263         op->o_bd = b0;
1264 }
1265
1266 static int
1267 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1268 {
1269         slap_callback *cb = op->o_callback;
1270         opcookie *opc = cb->sc_private;
1271         slap_overinst *on = opc->son;
1272         syncprov_info_t         *si = on->on_bi.bi_private;
1273         syncmatches *sm, *snext;
1274         modtarget *mt, mtdummy;
1275
1276         for (sm = opc->smatches; sm; sm=snext) {
1277                 snext = sm->sm_next;
1278                 syncprov_free_syncop( sm->sm_op );
1279                 op->o_tmpfree( sm, op->o_tmpmemctx );
1280         }
1281
1282         /* Remove op from lock table */
1283         mtdummy.mt_op = op;
1284         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1285         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1286         if ( mt ) {
1287                 modinst *mi = mt->mt_mods;
1288
1289                 /* If there are more, promote the next one */
1290                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1291                 if ( mi->mi_next ) {
1292                         mt->mt_mods = mi->mi_next;
1293                         mt->mt_op = mt->mt_mods->mi_op;
1294                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1295                 } else {
1296                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1297                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1298                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1299                         ch_free( mt );
1300                 }
1301         }
1302         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1303         if ( !BER_BVISNULL( &opc->suuid ))
1304                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1305         if ( !BER_BVISNULL( &opc->sndn ))
1306                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1307         if ( !BER_BVISNULL( &opc->sdn ))
1308                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1309         op->o_callback = cb->sc_next;
1310         op->o_tmpfree(cb, op->o_tmpmemctx);
1311
1312         return 0;
1313 }
1314
1315 static void
1316 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1317 {
1318         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1319         Modifications mod;
1320         Operation opm;
1321         SlapReply rsm = { 0 };
1322         slap_callback cb = {0};
1323         BackendDB be;
1324
1325         mod.sml_numvals = si->si_numcsns;
1326         mod.sml_values = si->si_ctxcsn;
1327         mod.sml_nvalues = NULL;
1328         mod.sml_desc = slap_schema.si_ad_contextCSN;
1329         mod.sml_op = LDAP_MOD_REPLACE;
1330         mod.sml_flags = 0;
1331         mod.sml_next = NULL;
1332
1333         cb.sc_response = slap_null_cb;
1334         opm = *op;
1335         opm.o_tag = LDAP_REQ_MODIFY;
1336         opm.o_callback = &cb;
1337         opm.orm_modlist = &mod;
1338         opm.orm_no_opattrs = 1;
1339         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1340                 be = *on->on_info->oi_origdb;
1341                 opm.o_bd = &be;
1342         }
1343         opm.o_req_dn = opm.o_bd->be_suffix[0];
1344         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1345         opm.o_bd->bd_info = on->on_info->oi_orig;
1346         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1347         opm.o_no_schema_check = 1;
1348         opm.o_bd->be_modify( &opm, &rsm );
1349         if ( mod.sml_next != NULL ) {
1350                 slap_mods_free( mod.sml_next, 1 );
1351         }
1352 }
1353
1354 static void
1355 syncprov_add_slog( Operation *op )
1356 {
1357         opcookie *opc = op->o_callback->sc_private;
1358         slap_overinst *on = opc->son;
1359         syncprov_info_t         *si = on->on_bi.bi_private;
1360         sessionlog *sl;
1361         slog_entry *se;
1362
1363         sl = si->si_logs;
1364         {
1365                 /* Allocate a record. UUIDs are not NUL-terminated. */
1366                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1367                         op->o_csn.bv_len + 1 );
1368                 se->se_next = NULL;
1369                 se->se_tag = op->o_tag;
1370
1371                 se->se_uuid.bv_val = (char *)(&se[1]);
1372                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1373                 se->se_uuid.bv_len = opc->suuid.bv_len;
1374
1375                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1376                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1377                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1378                 se->se_csn.bv_len = op->o_csn.bv_len;
1379                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1380
1381                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1382                 if ( sl->sl_head ) {
1383                         sl->sl_tail->se_next = se;
1384                 } else {
1385                         sl->sl_head = se;
1386                 }
1387                 sl->sl_tail = se;
1388                 sl->sl_num++;
1389                 while ( sl->sl_num > sl->sl_size ) {
1390                         se = sl->sl_head;
1391                         sl->sl_head = se->se_next;
1392                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1393                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1394                         ch_free( se );
1395                         sl->sl_num--;
1396                 }
1397                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1398         }
1399 }
1400
1401 /* Just set a flag if we found the matching entry */
1402 static int
1403 playlog_cb( Operation *op, SlapReply *rs )
1404 {
1405         if ( rs->sr_type == REP_SEARCH ) {
1406                 op->o_callback->sc_private = (void *)1;
1407         }
1408         return rs->sr_err;
1409 }
1410
1411 /* enter with sl->sl_mutex locked, release before returning */
1412 static void
1413 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1414         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1415 {
1416         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1417         slog_entry *se;
1418         int i, j, ndel, num, nmods, mmods;
1419         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1420         BerVarray uuids;
1421         struct berval delcsn[2];
1422
1423         if ( !sl->sl_num ) {
1424                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1425                 return;
1426         }
1427
1428         num = sl->sl_num;
1429         i = 0;
1430         nmods = 0;
1431
1432         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1433                 num * UUID_LEN, op->o_tmpmemctx );
1434         uuids[0].bv_val = (char *)(uuids + num + 1);
1435
1436         delcsn[0].bv_len = 0;
1437         delcsn[0].bv_val = cbuf;
1438         BER_BVZERO(&delcsn[1]);
1439
1440         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1441          * and everything else at the end. Do this first so we can
1442          * unlock the list mutex.
1443          */
1444         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1445                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1446         for ( se=sl->sl_head; se; se=se->se_next ) {
1447                 int k;
1448                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1449                 ndel = 1;
1450                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1451                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1452                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1453                                 break;
1454                         }
1455                 }
1456                 if ( ndel <= 0 ) {
1457                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1458                         continue;
1459                 }
1460                 ndel = 0;
1461                 for ( k=0; k<numcsns; k++ ) {
1462                         if ( se->se_sid == sids[k] ) {
1463                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1464                                 break;
1465                         }
1466                 }
1467                 if ( ndel > 0 ) {
1468                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1469                         break;
1470                 }
1471                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1472                         j = i;
1473                         i++;
1474                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1475                         delcsn[0].bv_len = se->se_csn.bv_len;
1476                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1477                 } else {
1478                         nmods++;
1479                         j = num - nmods;
1480                 }
1481                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1482                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1483                 uuids[j].bv_len = UUID_LEN;
1484         }
1485         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1486
1487         ndel = i;
1488
1489         /* Zero out unused slots */
1490         for ( i=ndel; i < num - nmods; i++ )
1491                 uuids[i].bv_len = 0;
1492
1493         /* Mods must be validated to see if they belong in this delete set.
1494          */
1495
1496         mmods = nmods;
1497         /* Strip any duplicates */
1498         for ( i=0; i<nmods; i++ ) {
1499                 for ( j=0; j<ndel; j++ ) {
1500                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1501                                 uuids[num - 1 - i].bv_len = 0;
1502                                 mmods --;
1503                                 break;
1504                         }
1505                 }
1506                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1507                 for ( j=0; j<i; j++ ) {
1508                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1509                                 uuids[num - 1 - i].bv_len = 0;
1510                                 mmods --;
1511                                 break;
1512                         }
1513                 }
1514         }
1515
1516         if ( mmods ) {
1517                 Operation fop;
1518                 SlapReply frs = { REP_RESULT };
1519                 int rc;
1520                 Filter mf, af;
1521                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1522                 slap_callback cb = {0};
1523
1524                 fop = *op;
1525
1526                 fop.o_sync_mode = 0;
1527                 fop.o_callback = &cb;
1528                 fop.ors_limit = NULL;
1529                 fop.ors_tlimit = SLAP_NO_LIMIT;
1530                 fop.ors_attrs = slap_anlist_all_attributes;
1531                 fop.ors_attrsonly = 0;
1532                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1533
1534                 af.f_choice = LDAP_FILTER_AND;
1535                 af.f_next = NULL;
1536                 af.f_and = &mf;
1537                 mf.f_choice = LDAP_FILTER_EQUALITY;
1538                 mf.f_ava = &eq;
1539                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1540                 mf.f_next = fop.ors_filter;
1541
1542                 fop.ors_filter = &af;
1543
1544                 cb.sc_response = playlog_cb;
1545                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1546
1547                 for ( i=ndel; i<num; i++ ) {
1548                         if ( uuids[i].bv_len == 0 ) continue;
1549
1550                         mf.f_av_value = uuids[i];
1551                         cb.sc_private = NULL;
1552                         fop.ors_slimit = 1;
1553                         frs.sr_nentries = 0;
1554                         rc = fop.o_bd->be_search( &fop, &frs );
1555
1556                         /* If entry was not found, add to delete list */
1557                         if ( !cb.sc_private ) {
1558                                 uuids[ndel++] = uuids[i];
1559                         }
1560                 }
1561                 fop.o_bd->bd_info = (BackendInfo *)on;
1562         }
1563         if ( ndel ) {
1564                 struct berval cookie;
1565
1566                 if ( delcsn[0].bv_len ) {
1567                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1568                                 srs->sr_state.sid );
1569                 }
1570
1571                 Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1572
1573                 uuids[ndel].bv_val = NULL;
1574                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1575                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1576                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1577         }
1578         op->o_tmpfree( uuids, op->o_tmpmemctx );
1579 }
1580
1581 static int
1582 syncprov_op_response( Operation *op, SlapReply *rs )
1583 {
1584         opcookie *opc = op->o_callback->sc_private;
1585         slap_overinst *on = opc->son;
1586         syncprov_info_t         *si = on->on_bi.bi_private;
1587         syncmatches *sm;
1588
1589         if ( rs->sr_err == LDAP_SUCCESS )
1590         {
1591                 struct berval maxcsn = BER_BVNULL;
1592                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1593                 int do_check = 0, have_psearches;
1594
1595                 /* Update our context CSN */
1596                 cbuf[0] = '\0';
1597                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1598                 slap_get_commit_csn( op, &maxcsn );
1599                 if ( !BER_BVISNULL( &maxcsn ) ) {
1600                         int i, sid;
1601                         strcpy( cbuf, maxcsn.bv_val );
1602                         sid = slap_parse_csn_sid( &maxcsn );
1603                         for ( i=0; i<si->si_numcsns; i++ ) {
1604                                 if ( sid == si->si_sids[i] ) {
1605                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1606                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1607                                         }
1608                                         break;
1609                                 }
1610                         }
1611                         /* It's a new SID for us */
1612                         if ( i == si->si_numcsns ) {
1613                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1614                                 si->si_numcsns++;
1615                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1616                                         sizeof(int));
1617                                 si->si_sids[i] = sid;
1618                         }
1619                 } else {
1620                         /* internal ops that aren't meant to be replicated */
1621                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1622                         return SLAP_CB_CONTINUE;
1623                 }
1624
1625                 /* Don't do any processing for consumer contextCSN updates */
1626                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1627                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1628                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1629                         return SLAP_CB_CONTINUE;
1630                 }
1631
1632                 si->si_numops++;
1633                 if ( si->si_chkops || si->si_chktime ) {
1634                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1635                                 do_check = 1;
1636                                 si->si_numops = 0;
1637                         }
1638                         if ( si->si_chktime &&
1639                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1640                                 if ( si->si_chklast ) {
1641                                         do_check = 1;
1642                                         si->si_chklast = op->o_time;
1643                                 } else {
1644                                         si->si_chklast = 1;
1645                                 }
1646                         }
1647                 }
1648                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1649
1650                 if ( do_check ) {
1651                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1652                         syncprov_checkpoint( op, rs, on );
1653                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1654                 }
1655
1656                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1657                 opc->sctxcsn.bv_val = cbuf;
1658
1659                 /* Handle any persistent searches */
1660                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1661                 have_psearches = ( si->si_ops != NULL );
1662                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1663                 if ( have_psearches ) {
1664                         switch(op->o_tag) {
1665                         case LDAP_REQ_ADD:
1666                         case LDAP_REQ_MODIFY:
1667                         case LDAP_REQ_MODRDN:
1668                         case LDAP_REQ_EXTENDED:
1669                                 syncprov_matchops( op, opc, 0 );
1670                                 break;
1671                         case LDAP_REQ_DELETE:
1672                                 /* for each match in opc->smatches:
1673                                  *   send DELETE msg
1674                                  */
1675                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1676                                         if ( sm->sm_op->s_op->o_abandon )
1677                                                 continue;
1678                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1679                                 }
1680                                 break;
1681                         }
1682                 }
1683
1684                 /* Add any log records */
1685                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1686                         syncprov_add_slog( op );
1687                 }
1688
1689         }
1690         return SLAP_CB_CONTINUE;
1691 }
1692
1693 /* We don't use a subentry to store the context CSN any more.
1694  * We expose the current context CSN as an operational attribute
1695  * of the suffix entry.
1696  */
1697 static int
1698 syncprov_op_compare( Operation *op, SlapReply *rs )
1699 {
1700         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1701         syncprov_info_t         *si = on->on_bi.bi_private;
1702         int rc = SLAP_CB_CONTINUE;
1703
1704         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1705                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1706         {
1707                 Entry e = {0};
1708                 Attribute a = {0};
1709
1710                 e.e_name = op->o_bd->be_suffix[0];
1711                 e.e_nname = op->o_bd->be_nsuffix[0];
1712                 e.e_attrs = &a;
1713
1714                 a.a_desc = slap_schema.si_ad_contextCSN;
1715
1716                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1717
1718                 a.a_vals = si->si_ctxcsn;
1719                 a.a_nvals = a.a_vals;
1720
1721                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1722                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1723                 if ( ! rs->sr_err ) {
1724                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1725                         goto return_results;
1726                 }
1727
1728                 if ( get_assert( op ) &&
1729                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1730                 {
1731                         rs->sr_err = LDAP_ASSERTION_FAILED;
1732                         goto return_results;
1733                 }
1734
1735
1736                 rs->sr_err = LDAP_COMPARE_FALSE;
1737
1738                 if ( attr_valfind( &a,
1739                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1740                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1741                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1742                 {
1743                         rs->sr_err = LDAP_COMPARE_TRUE;
1744                 }
1745
1746 return_results:;
1747
1748                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1749
1750                 send_ldap_result( op, rs );
1751
1752                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1753                         rs->sr_err = LDAP_SUCCESS;
1754                 }
1755                 rc = rs->sr_err;
1756         }
1757
1758         return rc;
1759 }
1760
1761 static int
1762 syncprov_op_mod( Operation *op, SlapReply *rs )
1763 {
1764         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1765         syncprov_info_t         *si = on->on_bi.bi_private;
1766         slap_callback *cb;
1767         opcookie *opc;
1768         int have_psearches, cbsize;
1769
1770         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1771         have_psearches = ( si->si_ops != NULL );
1772         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1773
1774         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1775                 (have_psearches ? sizeof(modinst) : 0 );
1776
1777         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1778         opc = (opcookie *)(cb+1);
1779         opc->son = on;
1780         cb->sc_response = syncprov_op_response;
1781         cb->sc_cleanup = syncprov_op_cleanup;
1782         cb->sc_private = opc;
1783         cb->sc_next = op->o_callback;
1784         op->o_callback = cb;
1785
1786         /* If there are active persistent searches, lock this operation.
1787          * See seqmod.c for the locking logic on its own.
1788          */
1789         if ( have_psearches ) {
1790                 modtarget *mt, mtdummy;
1791                 modinst *mi;
1792
1793                 mi = (modinst *)(opc+1);
1794                 mi->mi_op = op;
1795
1796                 /* See if we're already modifying this entry... */
1797                 mtdummy.mt_op = op;
1798                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1799                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1800                 if ( mt ) {
1801                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1802                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1803                         mt->mt_tail->mi_next = mi;
1804                         mt->mt_tail = mi;
1805                         /* wait for this op to get to head of list */
1806                         while ( mt->mt_mods != mi ) {
1807                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1808                                 /* FIXME: if dynamic config can delete overlays or
1809                                  * databases we'll have to check for cleanup here.
1810                                  * Currently it's not an issue because there are
1811                                  * no dynamic config deletes...
1812                                  */
1813                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1814                                         ldap_pvt_thread_yield();
1815                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1816
1817                                 /* clean up if the caller is giving up */
1818                                 if ( op->o_abandon ) {
1819                                         modinst *m2;
1820                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1821                                                 m2 = m2->mi_next );
1822                                         m2->mi_next = mi->mi_next;
1823                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1824                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1825                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1826                                         return SLAPD_ABANDON;
1827                                 }
1828                         }
1829                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1830                 } else {
1831                         /* Record that we're modifying this entry now */
1832                         mt = ch_malloc( sizeof(modtarget) );
1833                         mt->mt_mods = mi;
1834                         mt->mt_tail = mi;
1835                         mt->mt_op = mi->mi_op;
1836                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1837                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1838                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1839                 }
1840         }
1841
1842         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1843                 syncprov_matchops( op, opc, 1 );
1844
1845         return SLAP_CB_CONTINUE;
1846 }
1847
1848 static int
1849 syncprov_op_extended( Operation *op, SlapReply *rs )
1850 {
1851         if ( exop_is_write( op ))
1852                 return syncprov_op_mod( op, rs );
1853
1854         return SLAP_CB_CONTINUE;
1855 }
1856
1857 typedef struct searchstate {
1858         slap_overinst *ss_on;
1859         syncops *ss_so;
1860         BerVarray ss_ctxcsn;
1861         int *ss_sids;
1862         int ss_numcsns;
1863 #define SS_PRESENT      0x01
1864 #define SS_CHANGED      0x02
1865         int ss_flags;
1866 } searchstate;
1867
1868 static int
1869 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1870 {
1871         if ( rs->sr_ctrls ) {
1872                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1873                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1874                 rs->sr_ctrls = NULL;
1875         }
1876         return 0;
1877 }
1878
1879 typedef struct SyncOperationBuffer {
1880         Operation               sob_op;
1881         Opheader                sob_hdr;
1882         OpExtra                 sob_oe;
1883         AttributeName   sob_extra;      /* not always present */
1884         /* Further data allocated here */
1885 } SyncOperationBuffer;
1886
1887 static void
1888 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1889 {
1890         SyncOperationBuffer *sopbuf2;
1891         Operation *op2;
1892         int i, alen = 0;
1893         size_t size;
1894         char *ptr;
1895         GroupAssertion *g1, *g2;
1896
1897         /* count the search attrs */
1898         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1899                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1900         }
1901         /* Make a new copy of the operation */
1902         size = offsetof( SyncOperationBuffer, sob_extra ) +
1903                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1904                 op->o_req_dn.bv_len + 1 +
1905                 op->o_req_ndn.bv_len + 1 +
1906                 op->o_ndn.bv_len + 1 +
1907                 so->s_filterstr.bv_len + 1;
1908         sopbuf2 = ch_calloc( 1, size );
1909         op2 = &sopbuf2->sob_op;
1910         op2->o_hdr = &sopbuf2->sob_hdr;
1911         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
1912
1913         /* Copy the fields we care about explicitly, leave the rest alone */
1914         *op2->o_hdr = *op->o_hdr;
1915         op2->o_tag = op->o_tag;
1916         op2->o_time = op->o_time;
1917         op2->o_bd = on->on_info->oi_origdb;
1918         op2->o_request = op->o_request;
1919         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
1920         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
1921
1922         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1923         if ( i ) {
1924                 op2->ors_attrs = (AttributeName *) ptr;
1925                 ptr = (char *) &op2->ors_attrs[i+1];
1926                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1927                         op2->ors_attrs[i] = op->ors_attrs[i];
1928                         op2->ors_attrs[i].an_name.bv_val = ptr;
1929                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1930                 }
1931                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1932         }
1933
1934         op2->o_authz = op->o_authz;
1935         op2->o_ndn.bv_val = ptr;
1936         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1937         op2->o_dn = op2->o_ndn;
1938         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1939         op2->o_req_dn.bv_val = ptr;
1940         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1941         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1942         op2->o_req_ndn.bv_val = ptr;
1943         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1944         op2->ors_filterstr.bv_val = ptr;
1945         strcpy( ptr, so->s_filterstr.bv_val );
1946         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1947
1948         /* Skip the AND/GE clause that we stuck on in front */
1949         if ( so->s_flags & PS_FIX_FILTER ) {
1950                 op2->ors_filter = op->ors_filter->f_and->f_next;
1951                 so->s_flags ^= PS_FIX_FILTER;
1952         } else {
1953                 op2->ors_filter = op->ors_filter;
1954         }
1955         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1956         so->s_op = op2;
1957
1958         /* Copy any cached group ACLs individually */
1959         op2->o_groups = NULL;
1960         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1961                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1962                 *g2 = *g1;
1963                 strcpy( g2->ga_ndn, g1->ga_ndn );
1964                 g2->ga_next = op2->o_groups;
1965                 op2->o_groups = g2;
1966         }
1967         /* Don't allow any further group caching */
1968         op2->o_do_not_cache = 1;
1969
1970         /* Add op2 to conn so abandon will find us */
1971         op->o_conn->c_n_ops_executing++;
1972         op->o_conn->c_n_ops_completed--;
1973         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1974         so->s_flags |= PS_IS_DETACHED;
1975
1976         /* Prevent anyone else from trying to send a result for this op */
1977         op->o_abandon = 1;
1978 }
1979
1980 static int
1981 syncprov_search_response( Operation *op, SlapReply *rs )
1982 {
1983         searchstate *ss = op->o_callback->sc_private;
1984         slap_overinst *on = ss->ss_on;
1985         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1986         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1987
1988         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1989                 Attribute *a;
1990                 /* If we got a referral without a referral object, there's
1991                  * something missing that we cannot replicate. Just ignore it.
1992                  * The consumer will abort because we didn't send the expected
1993                  * control.
1994                  */
1995                 if ( !rs->sr_entry ) {
1996                         assert( rs->sr_entry != NULL );
1997                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1998                         return SLAP_CB_CONTINUE;
1999                 }
2000                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2001                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2002                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2003                 }
2004                 if ( a ) {
2005                         int i, sid;
2006                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2007
2008                         /* Don't send changed entries back to the originator */
2009                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2010                                 Debug( LDAP_DEBUG_SYNC,
2011                                         "Entry %s changed by peer, ignored\n",
2012                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2013                                 return LDAP_SUCCESS;
2014                         }
2015
2016                         /* If not a persistent search */
2017                         if ( !ss->ss_so ) {
2018                                 /* Make sure entry is less than the snapshot'd contextCSN */
2019                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2020                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2021                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2022                                                 Debug( LDAP_DEBUG_SYNC,
2023                                                         "Entry %s CSN %s greater than snapshot %s\n",
2024                                                         rs->sr_entry->e_name.bv_val,
2025                                                         a->a_nvals[0].bv_val,
2026                                                         ss->ss_ctxcsn[i].bv_val );
2027                                                 return LDAP_SUCCESS;
2028                                         }
2029                                 }
2030                         }
2031
2032                         /* Don't send old entries twice */
2033                         if ( srs->sr_state.ctxcsn ) {
2034                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2035                                         if ( sid == srs->sr_state.sids[i] &&
2036                                                 ber_bvcmp( &a->a_nvals[0],
2037                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2038                                                 Debug( LDAP_DEBUG_SYNC,
2039                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2040                                                         rs->sr_entry->e_name.bv_val,
2041                                                         a->a_nvals[0].bv_val,
2042                                                         srs->sr_state.ctxcsn[i].bv_val );
2043                                                 return LDAP_SUCCESS;
2044                                         }
2045                                 }
2046                         }
2047                 }
2048                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2049                         op->o_tmpmemctx );
2050                 rs->sr_ctrls[1] = NULL;
2051                 /* If we're in delta-sync mode, always send a cookie */
2052                 if ( si->si_nopres && si->si_usehint && a ) {
2053                         struct berval cookie;
2054                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, srs->sr_state.sid );
2055                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2056                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2057                 } else {
2058                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2059                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2060                 }
2061         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2062                 struct berval cookie;
2063
2064                 if ( ss->ss_flags & SS_CHANGED ) {
2065                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2066                                 srs->sr_state.rid, srs->sr_state.sid );
2067
2068                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2069                 }
2070
2071                 /* Is this a regular refresh?
2072                  * Note: refresh never gets here if there were no changes
2073                  */
2074                 if ( !ss->ss_so ) {
2075                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2076                                 op->o_tmpmemctx );
2077                         rs->sr_ctrls[1] = NULL;
2078                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2079                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2080                                         LDAP_SYNC_REFRESH_DELETES );
2081                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2082                 } else {
2083                 /* It's RefreshAndPersist, transition to Persist phase */
2084                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2085                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2086                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2087                                 1, NULL, 0 );
2088                         if ( ss->ss_flags & SS_CHANGED )
2089                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2090
2091                         /* Detach this Op from frontend control */
2092                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2093                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2094
2095                         /* But not if this connection was closed along the way */
2096                         if ( op->o_abandon ) {
2097                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2098                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2099                                 syncprov_free_syncop( ss->ss_so );
2100                                 return SLAPD_ABANDON;
2101
2102                         } else {
2103                                 /* Turn off the refreshing flag */
2104                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2105
2106                                 syncprov_detach_op( op, ss->ss_so, on );
2107
2108                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2109
2110                                 /* If there are queued responses, fire them off */
2111                                 if ( ss->ss_so->s_res )
2112                                         syncprov_qstart( ss->ss_so );
2113                         }
2114                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2115
2116                         return LDAP_SUCCESS;
2117                 }
2118         }
2119
2120         return SLAP_CB_CONTINUE;
2121 }
2122
2123 static int
2124 syncprov_op_search( Operation *op, SlapReply *rs )
2125 {
2126         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2127         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2128         slap_callback   *cb;
2129         int gotstate = 0, changed = 0, do_present = 0;
2130         syncops *sop = NULL;
2131         searchstate *ss;
2132         sync_control *srs;
2133         BerVarray ctxcsn;
2134         int i, *sids, numcsns;
2135         struct berval mincsn;
2136
2137         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2138
2139         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2140                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2141                 return rs->sr_err;
2142         }
2143
2144         srs = op->o_controls[slap_cids.sc_LDAPsync];
2145         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2146
2147         /* If this is a persistent search, set it up right away */
2148         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2149                 syncops so = {0};
2150                 fbase_cookie fc;
2151                 opcookie opc;
2152                 slap_callback sc;
2153
2154                 fc.fss = &so;
2155                 fc.fbase = 0;
2156                 so.s_eid = NOID;
2157                 so.s_op = op;
2158                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2159                 /* syncprov_findbase expects to be called as a callback... */
2160                 sc.sc_private = &opc;
2161                 opc.son = on;
2162                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2163                 cb = op->o_callback;
2164                 op->o_callback = &sc;
2165                 rs->sr_err = syncprov_findbase( op, &fc );
2166                 op->o_callback = cb;
2167                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2168
2169                 if ( rs->sr_err != LDAP_SUCCESS ) {
2170                         send_ldap_result( op, rs );
2171                         return rs->sr_err;
2172                 }
2173                 sop = ch_malloc( sizeof( syncops ));
2174                 *sop = so;
2175                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2176                 sop->s_rid = srs->sr_state.rid;
2177                 sop->s_sid = srs->sr_state.sid;
2178                 sop->s_inuse = 1;
2179
2180                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2181                 sop->s_next = si->si_ops;
2182                 si->si_ops = sop;
2183                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2184         }
2185
2186         /* snapshot the ctxcsn */
2187         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2188         numcsns = si->si_numcsns;
2189         if ( numcsns ) {
2190                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2191                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2192                 for ( i=0; i<numcsns; i++ )
2193                         sids[i] = si->si_sids[i];
2194         } else {
2195                 ctxcsn = NULL;
2196                 sids = NULL;
2197         }
2198         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2199
2200         /* If we have a cookie, handle the PRESENT lookups */
2201         if ( srs->sr_state.ctxcsn ) {
2202                 sessionlog *sl;
2203                 int i, j;
2204
2205                 /* If we don't have any CSN of our own yet, pretend nothing
2206                  * has changed.
2207                  */
2208                 if ( !numcsns )
2209                         goto no_change;
2210
2211                 if ( !si->si_nopres )
2212                         do_present = SS_PRESENT;
2213
2214                 /* If there are SIDs we don't recognize in the cookie, drop them */
2215                 for (i=0; i<srs->sr_state.numcsns; ) {
2216                         for (j=0; j<numcsns; j++) {
2217                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2218                                         break;
2219                                 }
2220                         }
2221                         /* not found */
2222                         if ( j == numcsns ) {
2223                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2224                                 j = srs->sr_state.numcsns - 1;
2225                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2226                                 tmp.bv_len = 0;
2227                                 srs->sr_state.ctxcsn[j] = tmp;
2228                                 srs->sr_state.numcsns = j;
2229                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2230                                 continue;
2231                         }
2232                         i++;
2233                 }
2234
2235                 /* Find the smallest CSN */
2236                 mincsn = srs->sr_state.ctxcsn[0];
2237                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2238                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2239                                 mincsn = srs->sr_state.ctxcsn[i];
2240                 }
2241
2242                 /* If nothing has changed, shortcut it */
2243                 if ( srs->sr_state.numcsns == numcsns ) {
2244                         int i, j;
2245                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2246                                 for ( j=0; j<numcsns; j++ ) {
2247                                         if ( srs->sr_state.sids[i] != sids[j] )
2248                                                 continue;
2249                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2250                                                 changed = SS_CHANGED;
2251                                         break;
2252                                 }
2253                                 if ( changed )
2254                                         break;
2255                         }
2256                         if ( !changed ) {
2257                                 do_present = 0;
2258 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2259                                         LDAPControl     *ctrls[2];
2260
2261                                         ctrls[0] = NULL;
2262                                         ctrls[1] = NULL;
2263                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2264                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2265                                         rs->sr_ctrls = ctrls;
2266                                         rs->sr_err = LDAP_SUCCESS;
2267                                         send_ldap_result( op, rs );
2268                                         rs->sr_ctrls = NULL;
2269                                         return rs->sr_err;
2270                                 }
2271                                 goto shortcut;
2272                         }
2273                 } else {
2274                         /* consumer doesn't have the right number of CSNs */
2275                         changed = SS_CHANGED;
2276                 }
2277                 /* Do we have a sessionlog for this search? */
2278                 sl=si->si_logs;
2279                 if ( sl ) {
2280                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2281                         /* Are there any log entries, and is the consumer state
2282                          * present in the session log?
2283                          */
2284                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2285                                 do_present = 0;
2286                                 /* mutex is unlocked in playlog */
2287                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2288                         } else {
2289                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2290                         }
2291                 }
2292                 /* Is the CSN still present in the database? */
2293                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2294                         /* No, so a reload is required */
2295                         /* the 2.2 consumer doesn't send this hint */
2296                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2297                                 if ( ctxcsn )
2298                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2299                                 if ( sids )
2300                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2301                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2302                                 return rs->sr_err;
2303                         }
2304                 } else {
2305                         gotstate = 1;
2306                         /* If changed and doing Present lookup, send Present UUIDs */
2307                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2308                                 LDAP_SUCCESS ) {
2309                                 if ( ctxcsn )
2310                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2311                                 if ( sids )
2312                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2313                                 send_ldap_result( op, rs );
2314                                 return rs->sr_err;
2315                         }
2316                 }
2317         } else {
2318                 /* No consumer state, assume something has changed */
2319                 changed = SS_CHANGED;
2320         }
2321
2322 shortcut:
2323         /* Append CSN range to search filter, save original filter
2324          * for persistent search evaluation
2325          */
2326         if ( sop ) {
2327                 sop->s_filterstr= op->ors_filterstr;
2328         }
2329
2330         /* If something changed, find the changes */
2331         if ( gotstate && changed ) {
2332                 Filter *fand, *fava;
2333
2334                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2335                 fand->f_choice = LDAP_FILTER_AND;
2336                 fand->f_next = NULL;
2337                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2338                 fand->f_and = fava;
2339                 fava->f_choice = LDAP_FILTER_GE;
2340                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2341                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2342 #ifdef LDAP_COMP_MATCH
2343                 fava->f_ava->aa_cf = NULL;
2344 #endif
2345                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2346                 fava->f_next = op->ors_filter;
2347                 op->ors_filter = fand;
2348                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2349                 if ( sop )
2350                         sop->s_flags |= PS_FIX_FILTER;
2351         }
2352
2353         /* Let our callback add needed info to returned entries */
2354         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2355         ss = (searchstate *)(cb+1);
2356         ss->ss_on = on;
2357         ss->ss_so = sop;
2358         ss->ss_flags = do_present | changed;
2359         ss->ss_ctxcsn = ctxcsn;
2360         ss->ss_numcsns = numcsns;
2361         ss->ss_sids = sids;
2362         cb->sc_response = syncprov_search_response;
2363         cb->sc_cleanup = syncprov_search_cleanup;
2364         cb->sc_private = ss;
2365         cb->sc_next = op->o_callback;
2366         op->o_callback = cb;
2367
2368         /* If this is a persistent search and no changes were reported during
2369          * the refresh phase, just invoke the response callback to transition
2370          * us into persist phase
2371          */
2372         if ( !changed ) {
2373                 rs->sr_err = LDAP_SUCCESS;
2374                 rs->sr_nentries = 0;
2375                 send_ldap_result( op, rs );
2376                 return rs->sr_err;
2377         }
2378         return SLAP_CB_CONTINUE;
2379 }
2380
2381 static int
2382 syncprov_operational(
2383         Operation *op,
2384         SlapReply *rs )
2385 {
2386         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2387         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2388
2389         /* This prevents generating unnecessarily; frontend will strip
2390          * any statically stored copy.
2391          */
2392         if ( op->o_sync != SLAP_CONTROL_NONE )
2393                 return SLAP_CB_CONTINUE;
2394
2395         if ( rs->sr_entry &&
2396                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2397
2398                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2399                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2400                         Attribute *a, **ap = NULL;
2401
2402                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2403                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2404                                         break;
2405                         }
2406
2407                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2408                         if ( si->si_ctxcsn ) {
2409                                 if ( !a ) {
2410                                         for ( ap = &rs->sr_operational_attrs; *ap;
2411                                                 ap=&(*ap)->a_next );
2412
2413                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2414                                         *ap = a;
2415                                 }
2416
2417                                 if ( !ap ) {
2418                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2419                                                 Entry *e = entry_dup( rs->sr_entry );
2420                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2421                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2422                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2423                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2424                                                         entry_free( rs->sr_entry );
2425                                                 }
2426                                                 rs->sr_entry = e;
2427                                                 rs->sr_flags |=
2428                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2429                                                 a = attr_find( rs->sr_entry->e_attrs,
2430                                                         slap_schema.si_ad_contextCSN );
2431                                         }
2432                                         if ( a->a_nvals != a->a_vals ) {
2433                                                 ber_bvarray_free( a->a_nvals );
2434                                         }
2435                                         a->a_nvals = NULL;
2436                                         ber_bvarray_free( a->a_vals );
2437                                         a->a_vals = NULL;
2438                                         a->a_numvals = 0;
2439                                 }
2440                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2441                         }
2442                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2443                 }
2444         }
2445         return SLAP_CB_CONTINUE;
2446 }
2447
2448 enum {
2449         SP_CHKPT = 1,
2450         SP_SESSL,
2451         SP_NOPRES,
2452         SP_USEHINT
2453 };
2454
2455 static ConfigDriver sp_cf_gen;
2456
2457 static ConfigTable spcfg[] = {
2458         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2459                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2460                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2461                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2462         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2463                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2464                         "DESC 'Session log size in ops' "
2465                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2466         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2467                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2468                         "DESC 'Omit Present phase processing' "
2469                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2470         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2471                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2472                         "DESC 'Observe Reload Hint in Request control' "
2473                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2474         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2475 };
2476
2477 static ConfigOCs spocs[] = {
2478         { "( OLcfgOvOc:1.1 "
2479                 "NAME 'olcSyncProvConfig' "
2480                 "DESC 'SyncRepl Provider configuration' "
2481                 "SUP olcOverlayConfig "
2482                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2483                         Cft_Overlay, spcfg },
2484         { NULL, 0, NULL }
2485 };
2486
2487 static int
2488 sp_cf_gen(ConfigArgs *c)
2489 {
2490         slap_overinst           *on = (slap_overinst *)c->bi;
2491         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2492         int rc = 0;
2493
2494         if ( c->op == SLAP_CONFIG_EMIT ) {
2495                 switch ( c->type ) {
2496                 case SP_CHKPT:
2497                         if ( si->si_chkops || si->si_chktime ) {
2498                                 struct berval bv;
2499                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2500                                         "%d %d", si->si_chkops, si->si_chktime );
2501                                 if ( bv.bv_len < 0 || bv.bv_len >= sizeof( c->cr_msg ) ) {
2502                                         rc = 1;
2503                                 } else {
2504                                         bv.bv_val = c->cr_msg;
2505                                         value_add_one( &c->rvalue_vals, &bv );
2506                                 }
2507                         } else {
2508                                 rc = 1;
2509                         }
2510                         break;
2511                 case SP_SESSL:
2512                         if ( si->si_logs ) {
2513                                 c->value_int = si->si_logs->sl_size;
2514                         } else {
2515                                 rc = 1;
2516                         }
2517                         break;
2518                 case SP_NOPRES:
2519                         if ( si->si_nopres ) {
2520                                 c->value_int = 1;
2521                         } else {
2522                                 rc = 1;
2523                         }
2524                         break;
2525                 case SP_USEHINT:
2526                         if ( si->si_usehint ) {
2527                                 c->value_int = 1;
2528                         } else {
2529                                 rc = 1;
2530                         }
2531                         break;
2532                 }
2533                 return rc;
2534         } else if ( c->op == LDAP_MOD_DELETE ) {
2535                 switch ( c->type ) {
2536                 case SP_CHKPT:
2537                         si->si_chkops = 0;
2538                         si->si_chktime = 0;
2539                         break;
2540                 case SP_SESSL:
2541                         if ( si->si_logs )
2542                                 si->si_logs->sl_size = 0;
2543                         else
2544                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2545                         break;
2546                 case SP_NOPRES:
2547                         if ( si->si_nopres )
2548                                 si->si_nopres = 0;
2549                         else
2550                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2551                         break;
2552                 case SP_USEHINT:
2553                         if ( si->si_usehint )
2554                                 si->si_usehint = 0;
2555                         else
2556                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2557                         break;
2558                 }
2559                 return rc;
2560         }
2561         switch ( c->type ) {
2562         case SP_CHKPT:
2563                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2564                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2565                                 c->argv[0], c->argv[1] );
2566                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2567                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2568                         return ARG_BAD_CONF;
2569                 }
2570                 if ( si->si_chkops <= 0 ) {
2571                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2572                                 c->argv[0], si->si_chkops );
2573                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2574                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2575                         return ARG_BAD_CONF;
2576                 }
2577                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2578                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2579                                 c->argv[0], c->argv[1] );
2580                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2581                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2582                         return ARG_BAD_CONF;
2583                 }
2584                 if ( si->si_chktime <= 0 ) {
2585                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2586                                 c->argv[0], si->si_chkops );
2587                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2588                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2589                         return ARG_BAD_CONF;
2590                 }
2591                 si->si_chktime *= 60;
2592                 break;
2593         case SP_SESSL: {
2594                 sessionlog *sl;
2595                 int size = c->value_int;
2596
2597                 if ( size < 0 ) {
2598                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2599                                 c->argv[0], size );
2600                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2601                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2602                         return ARG_BAD_CONF;
2603                 }
2604                 sl = si->si_logs;
2605                 if ( !sl ) {
2606                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2607                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2608                         sl->sl_mincsn.bv_len = 0;
2609                         sl->sl_num = 0;
2610                         sl->sl_head = sl->sl_tail = NULL;
2611                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2612                         si->si_logs = sl;
2613                 }
2614                 sl->sl_size = size;
2615                 }
2616                 break;
2617         case SP_NOPRES:
2618                 si->si_nopres = c->value_int;
2619                 break;
2620         case SP_USEHINT:
2621                 si->si_usehint = c->value_int;
2622                 break;
2623         }
2624         return rc;
2625 }
2626
2627 /* ITS#3456 we cannot run this search on the main thread, must use a
2628  * child thread in order to insure we have a big enough stack.
2629  */
2630 static void *
2631 syncprov_db_otask(
2632         void *ptr
2633 )
2634 {
2635         syncprov_findcsn( ptr, FIND_MAXCSN );
2636         return NULL;
2637 }
2638
2639 /* Read any existing contextCSN from the underlying db.
2640  * Then search for any entries newer than that. If no value exists,
2641  * just generate it. Cache whatever result.
2642  */
2643 static int
2644 syncprov_db_open(
2645         BackendDB *be,
2646         ConfigReply *cr
2647 )
2648 {
2649         slap_overinst   *on = (slap_overinst *) be->bd_info;
2650         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2651
2652         Connection conn = { 0 };
2653         OperationBuffer opbuf;
2654         Operation *op;
2655         Entry *e = NULL;
2656         Attribute *a;
2657         int rc;
2658         void *thrctx = NULL;
2659
2660         if ( !SLAP_LASTMOD( be )) {
2661                 Debug( LDAP_DEBUG_ANY,
2662                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2663                 return -1;
2664         }
2665
2666         if ( slapMode & SLAP_TOOL_MODE ) {
2667                 return 0;
2668         }
2669
2670         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2671         if ( rc ) {
2672                 return rc;
2673         }
2674
2675         thrctx = ldap_pvt_thread_pool_context();
2676         connection_fake_init( &conn, &opbuf, thrctx );
2677         op = &opbuf.ob_op;
2678         op->o_bd = be;
2679         op->o_dn = be->be_rootdn;
2680         op->o_ndn = be->be_rootndn;
2681
2682         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2683                 slap_schema.si_ad_contextCSN, 0, &e, on );
2684
2685         if ( e ) {
2686                 ldap_pvt_thread_t tid;
2687
2688                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2689                 if ( a ) {
2690                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2691                         si->si_numcsns = a->a_numvals;
2692                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2693                 }
2694                 overlay_entry_release_ov( op, e, 0, on );
2695                 if ( si->si_ctxcsn ) {
2696                         op->o_req_dn = be->be_suffix[0];
2697                         op->o_req_ndn = be->be_nsuffix[0];
2698                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2699                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2700                         ldap_pvt_thread_join( tid, NULL );
2701                 }
2702         }
2703
2704         /* Didn't find a contextCSN, should we generate one? */
2705         if ( !si->si_ctxcsn ) {
2706                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2707                 struct berval csn;
2708
2709                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2710                 /* If we're also a consumer, then don't generate anything.
2711                  * Wait for our provider to send it to us, or for a local
2712                  * modify if we have multimaster.
2713                  */
2714                         goto out;
2715                 }
2716                 csn.bv_val = csnbuf;
2717                 csn.bv_len = sizeof( csnbuf );
2718                 slap_get_csn( op, &csn, 0 );
2719                 value_add_one( &si->si_ctxcsn, &csn );
2720                 si->si_numcsns = 1;
2721                 si->si_sids = ch_malloc( sizeof(int) );
2722                 si->si_sids[0] = slap_serverID;
2723
2724                 /* make sure we do a checkpoint on close */
2725                 si->si_numops++;
2726         }
2727
2728 out:
2729         op->o_bd->bd_info = (BackendInfo *)on;
2730         return 0;
2731 }
2732
2733 /* Write the current contextCSN into the underlying db.
2734  */
2735 static int
2736 syncprov_db_close(
2737         BackendDB *be,
2738         ConfigReply *cr
2739 )
2740 {
2741     slap_overinst   *on = (slap_overinst *) be->bd_info;
2742     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2743
2744         if ( slapMode & SLAP_TOOL_MODE ) {
2745                 return 0;
2746         }
2747         if ( si->si_numops ) {
2748                 Connection conn = {0};
2749                 OperationBuffer opbuf;
2750                 Operation *op;
2751                 SlapReply rs = {REP_RESULT};
2752                 void *thrctx;
2753
2754                 thrctx = ldap_pvt_thread_pool_context();
2755                 connection_fake_init( &conn, &opbuf, thrctx );
2756                 op = &opbuf.ob_op;
2757                 op->o_bd = be;
2758                 op->o_dn = be->be_rootdn;
2759                 op->o_ndn = be->be_rootndn;
2760                 syncprov_checkpoint( op, &rs, on );
2761         }
2762
2763     return 0;
2764 }
2765
2766 static int
2767 syncprov_db_init(
2768         BackendDB *be,
2769         ConfigReply *cr
2770 )
2771 {
2772         slap_overinst   *on = (slap_overinst *)be->bd_info;
2773         syncprov_info_t *si;
2774
2775         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2776                 Debug( LDAP_DEBUG_ANY,
2777                         "syncprov must be instantiated within a database.\n",
2778                         0, 0, 0 );
2779                 return 1;
2780         }
2781
2782         si = ch_calloc(1, sizeof(syncprov_info_t));
2783         on->on_bi.bi_private = si;
2784         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2785         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2786         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2787
2788         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2789         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2790         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2791         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2792
2793         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2794         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2795
2796         return 0;
2797 }
2798
2799 static int
2800 syncprov_db_destroy(
2801         BackendDB *be,
2802         ConfigReply *cr
2803 )
2804 {
2805         slap_overinst   *on = (slap_overinst *)be->bd_info;
2806         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2807
2808         if ( si ) {
2809                 if ( si->si_logs ) {
2810                         slog_entry *se = si->si_logs->sl_head;
2811
2812                         while ( se ) {
2813                                 slog_entry *se_next = se->se_next;
2814                                 ch_free( se );
2815                                 se = se_next;
2816                         }
2817
2818                         ch_free( si->si_logs );
2819                 }
2820                 if ( si->si_ctxcsn )
2821                         ber_bvarray_free( si->si_ctxcsn );
2822                 if ( si->si_sids )
2823                         ch_free( si->si_sids );
2824                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2825                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2826                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2827                 ch_free( si );
2828         }
2829
2830         return 0;
2831 }
2832
2833 static int syncprov_parseCtrl (
2834         Operation *op,
2835         SlapReply *rs,
2836         LDAPControl *ctrl )
2837 {
2838         ber_tag_t tag;
2839         BerElementBuffer berbuf;
2840         BerElement *ber = (BerElement *)&berbuf;
2841         ber_int_t mode;
2842         ber_len_t len;
2843         struct berval cookie = BER_BVNULL;
2844         sync_control *sr;
2845         int rhint = 0;
2846
2847         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2848                 rs->sr_text = "Sync control specified multiple times";
2849                 return LDAP_PROTOCOL_ERROR;
2850         }
2851
2852         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2853                 rs->sr_text = "Sync control specified with pagedResults control";
2854                 return LDAP_PROTOCOL_ERROR;
2855         }
2856
2857         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2858                 rs->sr_text = "Sync control value is absent";
2859                 return LDAP_PROTOCOL_ERROR;
2860         }
2861
2862         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2863                 rs->sr_text = "Sync control value is empty";
2864                 return LDAP_PROTOCOL_ERROR;
2865         }
2866
2867         /* Parse the control value
2868          *      syncRequestValue ::= SEQUENCE {
2869          *              mode   ENUMERATED {
2870          *                      -- 0 unused
2871          *                      refreshOnly             (1),
2872          *                      -- 2 reserved
2873          *                      refreshAndPersist       (3)
2874          *              },
2875          *              cookie  syncCookie OPTIONAL
2876          *      }
2877          */
2878
2879         ber_init2( ber, &ctrl->ldctl_value, 0 );
2880
2881         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2882                 rs->sr_text = "Sync control : mode decoding error";
2883                 return LDAP_PROTOCOL_ERROR;
2884         }
2885
2886         switch( mode ) {
2887         case LDAP_SYNC_REFRESH_ONLY:
2888                 mode = SLAP_SYNC_REFRESH;
2889                 break;
2890         case LDAP_SYNC_REFRESH_AND_PERSIST:
2891                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2892                 break;
2893         default:
2894                 rs->sr_text = "Sync control : unknown update mode";
2895                 return LDAP_PROTOCOL_ERROR;
2896         }
2897
2898         tag = ber_peek_tag( ber, &len );
2899
2900         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2901                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2902                         rs->sr_text = "Sync control : cookie decoding error";
2903                         return LDAP_PROTOCOL_ERROR;
2904                 }
2905                 tag = ber_peek_tag( ber, &len );
2906         }
2907         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2908                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2909                         rs->sr_text = "Sync control : rhint decoding error";
2910                         return LDAP_PROTOCOL_ERROR;
2911                 }
2912         }
2913         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2914                         rs->sr_text = "Sync control : decoding error";
2915                         return LDAP_PROTOCOL_ERROR;
2916         }
2917         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2918         sr->sr_rhint = rhint;
2919         if (!BER_BVISNULL(&cookie)) {
2920                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2921                 /* If parse fails, pretend no cookie was sent */
2922                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2923                         sr->sr_state.rid == -1 ) {
2924                         if ( sr->sr_state.ctxcsn ) {
2925                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2926                                 sr->sr_state.ctxcsn = NULL;
2927                         }
2928                         sr->sr_state.numcsns = 0;
2929                 }
2930         }
2931
2932         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2933
2934         op->o_sync = ctrl->ldctl_iscritical
2935                 ? SLAP_CONTROL_CRITICAL
2936                 : SLAP_CONTROL_NONCRITICAL;
2937
2938         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2939
2940         return LDAP_SUCCESS;
2941 }
2942
2943 /* This overlay is set up for dynamic loading via moduleload. For static
2944  * configuration, you'll need to arrange for the slap_overinst to be
2945  * initialized and registered by some other function inside slapd.
2946  */
2947
2948 static slap_overinst            syncprov;
2949
2950 int
2951 syncprov_initialize()
2952 {
2953         int rc;
2954
2955         rc = register_supported_control( LDAP_CONTROL_SYNC,
2956                 SLAP_CTRL_SEARCH, NULL,
2957                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2958         if ( rc != LDAP_SUCCESS ) {
2959                 Debug( LDAP_DEBUG_ANY,
2960                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2961                 return rc;
2962         }
2963
2964         syncprov.on_bi.bi_type = "syncprov";
2965         syncprov.on_bi.bi_db_init = syncprov_db_init;
2966         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2967         syncprov.on_bi.bi_db_open = syncprov_db_open;
2968         syncprov.on_bi.bi_db_close = syncprov_db_close;
2969
2970         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2971         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2972
2973         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2974         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2975         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2976         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2977         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2978         syncprov.on_bi.bi_op_search = syncprov_op_search;
2979         syncprov.on_bi.bi_extended = syncprov_op_extended;
2980         syncprov.on_bi.bi_operational = syncprov_operational;
2981
2982         syncprov.on_bi.bi_cf_ocs = spocs;
2983
2984         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2985
2986         rc = config_register_schema( spcfg, spocs );
2987         if ( rc ) return rc;
2988
2989         return overlay_register( &syncprov );
2990 }
2991
2992 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2993 int
2994 init_module( int argc, char *argv[] )
2995 {
2996         return syncprov_initialize();
2997 }
2998 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2999
3000 #endif /* defined(SLAPD_OVER_SYNCPROV) */