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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #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         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73 #define RUNQ_INTERVAL   36000   /* a long time */
  74         ldap_pvt_thread_mutex_t s_mutex;
  75 } syncops;
  76
  77 /* A received sync control */
  78 typedef struct sync_control {
  79         struct sync_cookie sr_state;
  80         int sr_rhint;
  81 } sync_control;
  82
  83 #if 0 /* moved back to slap.h */
  84 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  85 #endif
  86 /* o_sync_mode uses data bits of o_sync */
  87 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  88
  89 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  93
  94 /* Record of which searches matched at premodify step */
  95 typedef struct syncmatches {
  96         struct syncmatches *sm_next;
  97         syncops *sm_op;
  98 } syncmatches;
  99
 100 /* Session log data */
 101 typedef struct slog_entry {
 102         struct slog_entry *se_next;
 103         struct berval se_uuid;
 104         struct berval se_csn;
 105         ber_tag_t       se_tag;
 106 } slog_entry;
 107
 108 typedef struct sessionlog {
 109         struct berval   sl_mincsn;
 110         int             sl_num;
 111         int             sl_size;
 112         slog_entry *sl_head;
 113         slog_entry *sl_tail;
 114         ldap_pvt_thread_mutex_t sl_mutex;
 115 } sessionlog;
 116
 117 /* The main state for this overlay */
 118 typedef struct syncprov_info_t {
 119         syncops         *si_ops;
 120         struct berval   si_ctxcsn;      /* ldapsync context */
 121         int             si_chkops;      /* checkpointing info */
 122         int             si_chktime;
 123         int             si_numops;      /* number of ops since last checkpoint */
 124         int             si_nopres;      /* Skip present phase */
 125         int             si_usehint;     /* use reload hint */
 126         time_t  si_chklast;     /* time of last checkpoint */
 127         Avlnode *si_mods;       /* entries being modified */
 128         sessionlog      *si_logs;
 129         ldap_pvt_thread_mutex_t si_csn_mutex;
 130         ldap_pvt_thread_mutex_t si_ops_mutex;
 131         ldap_pvt_thread_mutex_t si_mods_mutex;
 132         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 133 } syncprov_info_t;
 134
 135 typedef struct opcookie {
 136         slap_overinst *son;
 137         syncmatches *smatches;
 138         struct berval sdn;      /* DN of entry, for deletes */
 139         struct berval sndn;
 140         struct berval suuid;    /* UUID of entry */
 141         struct berval sctxcsn;
 142         int sreference; /* Is the entry a reference? */
 143 } opcookie;
 144
 145 typedef struct fbase_cookie {
 146         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 147         syncops *fss;   /* persistent search we're testing against */
 148         int fbase;      /* if TRUE we found the search base and it's still valid */
 149         int fscope;     /* if TRUE then fdn is within the psearch scope */
 150 } fbase_cookie;
 151
 152 static AttributeName csn_anlist[3];
 153 static AttributeName uuid_anlist[2];
 154
 155 /* Build a LDAPsync intermediate state control */
 156 static int
 157 syncprov_state_ctrl(
 158         Operation       *op,
 159         SlapReply       *rs,
 160         Entry           *e,
 161         int             entry_sync_state,
 162         LDAPControl     **ctrls,
 163         int             num_ctrls,
 164         int             send_cookie,
 165         struct berval   *cookie )
 166 {
 167         Attribute* a;
 168         int ret;
 169
 170         BerElementBuffer berbuf;
 171         BerElement *ber = (BerElement *)&berbuf;
 172
 173         struct berval   entryuuid_bv = BER_BVNULL;
 174
 175         ber_init2( ber, 0, LBER_USE_DER );
 176         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 177
 178         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 179
 180         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 181                 AttributeDescription *desc = a->a_desc;
 182                 if ( desc == slap_schema.si_ad_entryUUID ) {
 183                         entryuuid_bv = a->a_nvals[0];
 184                         break;
 185                 }
 186         }
 187
 188         /* FIXME: what if entryuuid is NULL or empty ? */
 189
 190         if ( send_cookie && cookie ) {
 191                 ber_printf( ber, "{eOON}",
 192                         entry_sync_state, &entryuuid_bv, cookie );
 193         } else {
 194                 ber_printf( ber, "{eON}",
 195                         entry_sync_state, &entryuuid_bv );
 196         }
 197
 198         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 199         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 200         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 201
 202         ber_free_buf( ber );
 203
 204         if ( ret < 0 ) {
 205                 Debug( LDAP_DEBUG_TRACE,
 206                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 207                         0, 0, 0 );
 208                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 209                 return ret;
 210         }
 211
 212         return LDAP_SUCCESS;
 213 }
 214
 215 /* Build a LDAPsync final state control */
 216 static int
 217 syncprov_done_ctrl(
 218         Operation       *op,
 219         SlapReply       *rs,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval *cookie,
 224         int                     refreshDeletes )
 225 {
 226         int ret;
 227         BerElementBuffer berbuf;
 228         BerElement *ber = (BerElement *)&berbuf;
 229
 230         ber_init2( ber, NULL, LBER_USE_DER );
 231         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 232
 233         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 234
 235         ber_printf( ber, "{" );
 236         if ( send_cookie && cookie ) {
 237                 ber_printf( ber, "O", cookie );
 238         }
 239         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 240                 ber_printf( ber, "b", refreshDeletes );
 241         }
 242         ber_printf( ber, "N}" );
 243
 244         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 245         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 246         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 247
 248         ber_free_buf( ber );
 249
 250         if ( ret < 0 ) {
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 253                         0, 0, 0 );
 254                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 255                 return ret;
 256         }
 257
 258         return LDAP_SUCCESS;
 259 }
 260
 261 static int
 262 syncprov_sendinfo(
 263         Operation       *op,
 264         SlapReply       *rs,
 265         int                     type,
 266         struct berval *cookie,
 267         int                     refreshDone,
 268         BerVarray       syncUUIDs,
 269         int                     refreshDeletes )
 270 {
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273         struct berval rspdata;
 274
 275         int ret;
 276
 277         ber_init2( ber, NULL, LBER_USE_DER );
 278         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 279
 280         if ( type ) {
 281                 switch ( type ) {
 282                 case LDAP_TAG_SYNC_NEW_COOKIE:
 283                         ber_printf( ber, "tO", type, cookie );
 284                         break;
 285                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 286                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 287                         ber_printf( ber, "t{", type );
 288                         if ( cookie ) {
 289                                 ber_printf( ber, "O", cookie );
 290                         }
 291                         if ( refreshDone == 0 ) {
 292                                 ber_printf( ber, "b", refreshDone );
 293                         }
 294                         ber_printf( ber, "N}" );
 295                         break;
 296                 case LDAP_TAG_SYNC_ID_SET:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDeletes == 1 ) {
 302                                 ber_printf( ber, "b", refreshDeletes );
 303                         }
 304                         ber_printf( ber, "[W]", syncUUIDs );
 305                         ber_printf( ber, "N}" );
 306                         break;
 307                 default:
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 310                                 type, 0, 0 );
 311                         return LDAP_OTHER;
 312                 }
 313         }
 314
 315         ret = ber_flatten2( ber, &rspdata, 0 );
 316
 317         if ( ret < 0 ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "syncprov_sendinfo: ber_flatten2 failed\n",
 320                         0, 0, 0 );
 321                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 322                 return ret;
 323         }
 324
 325         rs->sr_rspoid = LDAP_SYNC_INFO;
 326         rs->sr_rspdata = &rspdata;
 327         send_ldap_intermediate( op, rs );
 328         rs->sr_rspdata = NULL;
 329         ber_free_buf( ber );
 330
 331         return LDAP_SUCCESS;
 332 }
 333
 334 /* Find a modtarget in an AVL tree */
 335 static int
 336 sp_avl_cmp( const void *c1, const void *c2 )
 337 {
 338         const modtarget *m1, *m2;
 339         int rc;
 340
 341         m1 = c1; m2 = c2;
 342         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 343
 344         if ( rc ) return rc;
 345         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 346 }
 347
 348 /* syncprov_findbase:
 349  *   finds the true DN of the base of a search (with alias dereferencing) and
 350  * checks to make sure the base entry doesn't get replaced with a different
 351  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 352  * change is detected, any persistent search on this base must be terminated /
 353  * reloaded.
 354  *   On the first call, we just save the DN and entryID. On subsequent calls
 355  * we compare the DN and entryID with the saved values.
 356  */
 357 static int
 358 findbase_cb( Operation *op, SlapReply *rs )
 359 {
 360         slap_callback *sc = op->o_callback;
 361
 362         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 363                 fbase_cookie *fc = sc->sc_private;
 364
 365                 /* If no entryID, we're looking for the first time.
 366                  * Just store whatever we got.
 367                  */
 368                 if ( fc->fss->s_eid == NOID ) {
 369                         fc->fbase = 2;
 370                         fc->fss->s_eid = rs->sr_entry->e_id;
 371                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 372
 373                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 374                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 375
 376                 /* OK, the DN is the same and the entryID is the same. */
 377                         fc->fbase = 1;
 378                 }
 379         }
 380         if ( rs->sr_err != LDAP_SUCCESS ) {
 381                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 382         }
 383         return LDAP_SUCCESS;
 384 }
 385
 386 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 387 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 388
 389 static int
 390 syncprov_findbase( Operation *op, fbase_cookie *fc )
 391 {
 392         opcookie *opc = op->o_callback->sc_private;
 393         slap_overinst *on = opc->son;
 394
 395         /* Use basic parameters from syncrepl search, but use
 396          * current op's threadctx / tmpmemctx
 397          */
 398         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 399         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 400                 slap_callback cb = {0};
 401                 Operation fop;
 402                 SlapReply frs = { REP_RESULT };
 403                 int rc;
 404
 405                 fc->fss->s_flags ^= PS_FIND_BASE;
 406                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 407
 408                 fop = *fc->fss->s_op;
 409
 410                 fop.o_hdr = op->o_hdr;
 411                 fop.o_bd = op->o_bd;
 412                 fop.o_time = op->o_time;
 413                 fop.o_tincr = op->o_tincr;
 414
 415                 cb.sc_response = findbase_cb;
 416                 cb.sc_private = fc;
 417
 418                 fop.o_sync_mode = 0;    /* turn off sync mode */
 419                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 420                 fop.o_callback = &cb;
 421                 fop.o_tag = LDAP_REQ_SEARCH;
 422                 fop.ors_scope = LDAP_SCOPE_BASE;
 423                 fop.ors_limit = NULL;
 424                 fop.ors_slimit = 1;
 425                 fop.ors_tlimit = SLAP_NO_LIMIT;
 426                 fop.ors_attrs = slap_anlist_no_attrs;
 427                 fop.ors_attrsonly = 1;
 428                 fop.ors_filter = &generic_filter;
 429                 fop.ors_filterstr = generic_filterstr;
 430
 431                 fop.o_bd->bd_info = on->on_info->oi_orig;
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433                 fop.o_bd->bd_info = (BackendInfo *)on;
 434         } else {
 435                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 436                 fc->fbase = 1;
 437         }
 438
 439         /* After the first call, see if the fdn resides in the scope */
 440         if ( fc->fbase == 1 ) {
 441                 switch ( fc->fss->s_op->ors_scope ) {
 442                 case LDAP_SCOPE_BASE:
 443                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 444                         break;
 445                 case LDAP_SCOPE_ONELEVEL: {
 446                         struct berval pdn;
 447                         dnParent( fc->fdn, &pdn );
 448                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 449                         break; }
 450                 case LDAP_SCOPE_SUBTREE:
 451                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 452                         break;
 453 #ifdef LDAP_SCOPE_SUBORDINATE
 454                 case LDAP_SCOPE_SUBORDINATE:
 455                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 456                                 !dn_match( fc->fdn, &fc->fss->s_base );
 457                         break;
 458 #endif
 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, af;
 585 #ifdef LDAP_COMP_MATCH
 586         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 587 #else
 588         AttributeAssertion eq = { NULL, BER_BVNULL };
 589 #endif
 590         fpres_cookie pcookie;
 591         sync_control *srs = NULL;
 592         struct slap_limits_set fc_limits;
 593         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 594
 595         if ( mode != FIND_MAXCSN ) {
 596                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 597
 598                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 599                         return LDAP_OTHER;
 600                 }
 601         }
 602
 603         fop = *op;
 604         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 605         /* We want pure entries, not referrals */
 606         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 607
 608         cf.f_ava = &eq;
 609         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 610         cf.f_next = NULL;
 611
 612         fop.o_callback = &cb;
 613         fop.ors_limit = NULL;
 614         fop.ors_tlimit = SLAP_NO_LIMIT;
 615         fop.ors_filter = &cf;
 616         fop.ors_filterstr.bv_val = buf;
 617
 618 again:
 619         switch( mode ) {
 620         case FIND_MAXCSN:
 621                 cf.f_choice = LDAP_FILTER_GE;
 622                 cf.f_av_value = si->si_ctxcsn;
 623                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 624                         cf.f_av_value.bv_val );
 625                 fop.ors_attrsonly = 0;
 626                 fop.ors_attrs = csn_anlist;
 627                 fop.ors_slimit = SLAP_NO_LIMIT;
 628                 cb.sc_private = &maxcsn;
 629                 cb.sc_response = findmax_cb;
 630                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 631                 maxcsn.bv_val = cbuf;
 632                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 633                 break;
 634         case FIND_CSN:
 635                 cf.f_av_value = srs->sr_state.ctxcsn;
 636                 /* Look for exact match the first time */
 637                 if ( findcsn_retry ) {
 638                         cf.f_choice = LDAP_FILTER_EQUALITY;
 639                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 640                                 cf.f_av_value.bv_val );
 641                 /* On retry, look for <= */
 642                 } else {
 643                         cf.f_choice = LDAP_FILTER_LE;
 644                         fop.ors_limit = &fc_limits;
 645                         fc_limits.lms_s_unchecked = 1;
 646                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 647                                 cf.f_av_value.bv_val );
 648                 }
 649                 fop.ors_attrsonly = 1;
 650                 fop.ors_attrs = slap_anlist_no_attrs;
 651                 fop.ors_slimit = 1;
 652                 cb.sc_private = NULL;
 653                 cb.sc_response = findcsn_cb;
 654                 break;
 655         case FIND_PRESENT:
 656                 af.f_choice = LDAP_FILTER_AND;
 657                 af.f_next = NULL;
 658                 af.f_and = &cf;
 659                 cf.f_choice = LDAP_FILTER_LE;
 660                 cf.f_av_value = srs->sr_state.ctxcsn;
 661                 cf.f_next = op->ors_filter;
 662                 fop.ors_filter = &af;
 663                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 664                 fop.ors_attrsonly = 0;
 665                 fop.ors_attrs = uuid_anlist;
 666                 fop.ors_slimit = SLAP_NO_LIMIT;
 667                 cb.sc_private = &pcookie;
 668                 cb.sc_response = findpres_cb;
 669                 pcookie.num = 0;
 670
 671                 /* preallocate storage for a full set */
 672                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 673                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 674                         op->o_tmpmemctx );
 675                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 676                 pcookie.uuids[0].bv_val = pcookie.last;
 677                 pcookie.uuids[0].bv_len = UUID_LEN;
 678                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 679                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 680                         pcookie.uuids[i].bv_len = UUID_LEN;
 681                 }
 682                 break;
 683         }
 684
 685         fop.o_bd->bd_info = on->on_info->oi_orig;
 686         fop.o_bd->be_search( &fop, &frs );
 687         fop.o_bd->bd_info = (BackendInfo *)on;
 688
 689         switch( mode ) {
 690         case FIND_MAXCSN:
 691                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 692                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 693                 break;
 694         case FIND_CSN:
 695                 /* If matching CSN was not found, invalidate the context. */
 696                 if ( !cb.sc_private ) {
 697                         /* If we didn't find an exact match, then try for <= */
 698                         if ( findcsn_retry ) {
 699                                 findcsn_retry = 0;
 700                                 goto again;
 701                         }
 702                         rc = LDAP_NO_SUCH_OBJECT;
 703                 }
 704                 break;
 705         case FIND_PRESENT:
 706                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 707                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 708                 break;
 709         }
 710
 711         return rc;
 712 }
 713
 714 static void
 715 syncprov_free_syncop( syncops *so )
 716 {
 717         syncres *sr, *srnext;
 718         GroupAssertion *ga, *gnext;
 719
 720         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 721         if ( --so->s_inuse > 0 ) {
 722                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 723                 return;
 724         }
 725         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 726         if ( so->s_flags & PS_IS_DETACHED ) {
 727                 filter_free( so->s_op->ors_filter );
 728                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 729                         gnext = ga->ga_next;
 730                         ch_free( ga );
 731                 }
 732                 ch_free( so->s_op );
 733         }
 734         ch_free( so->s_base.bv_val );
 735         for ( sr=so->s_res; sr; sr=srnext ) {
 736                 srnext = sr->s_next;
 737                 ch_free( sr );
 738         }
 739         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 740         ch_free( so );
 741 }
 742
 743 /* Send a persistent search response */
 744 static int
 745 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 746         Entry **e, int mode )
 747 {
 748         slap_overinst *on = opc->son;
 749
 750         SlapReply rs = { REP_SEARCH };
 751         LDAPControl *ctrls[2];
 752         struct berval cookie;
 753         Entry e_uuid = {0};
 754         Attribute a_uuid = {0};
 755
 756         if ( so->s_op->o_abandon )
 757                 return SLAPD_ABANDON;
 758
 759         ctrls[1] = NULL;
 760         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 761
 762         e_uuid.e_attrs = &a_uuid;
 763         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 764         a_uuid.a_nvals = &opc->suuid;
 765         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 766                 mode, ctrls, 0, 1, &cookie );
 767         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 768
 769         rs.sr_ctrls = ctrls;
 770         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 771         switch( mode ) {
 772         case LDAP_SYNC_ADD:
 773                 rs.sr_entry = *e;
 774                 if ( rs.sr_entry->e_private )
 775                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 776                 if ( opc->sreference ) {
 777                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 778                         send_search_reference( op, &rs );
 779                         ber_bvarray_free( rs.sr_ref );
 780                         if ( !rs.sr_entry )
 781                                 *e = NULL;
 782                         break;
 783                 }
 784                 /* fallthru */
 785         case LDAP_SYNC_MODIFY:
 786                 rs.sr_entry = *e;
 787                 if ( rs.sr_entry->e_private )
 788                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 789                 rs.sr_attrs = op->ors_attrs;
 790                 send_search_entry( op, &rs );
 791                 if ( !rs.sr_entry )
 792                         *e = NULL;
 793                 break;
 794         case LDAP_SYNC_DELETE:
 795                 e_uuid.e_attrs = NULL;
 796                 e_uuid.e_name = opc->sdn;
 797                 e_uuid.e_nname = opc->sndn;
 798                 rs.sr_entry = &e_uuid;
 799                 if ( opc->sreference ) {
 800                         struct berval bv = BER_BVNULL;
 801                         rs.sr_ref = &bv;
 802                         send_search_reference( op, &rs );
 803                 } else {
 804                         send_search_entry( op, &rs );
 805                 }
 806                 break;
 807         default:
 808                 assert(0);
 809         }
 810         /* In case someone else freed it already? */
 811         if ( rs.sr_ctrls ) {
 812                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 813                 rs.sr_ctrls = NULL;
 814         }
 815
 816         return rs.sr_err;
 817 }
 818
 819 /* Play back queued responses */
 820 static int
 821 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 822 {
 823         syncres *sr;
 824         Entry *e;
 825         opcookie opc;
 826         int rc;
 827
 828         opc.son = on;
 829         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 830
 831         for (;;) {
 832                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 833                 sr = so->s_res;
 834                 if ( sr )
 835                         so->s_res = sr->s_next;
 836                 if ( !so->s_res )
 837                         so->s_restail = NULL;
 838                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 839
 840                 if ( !sr || so->s_op->o_abandon )
 841                         break;
 842
 843                 opc.sdn = sr->s_dn;
 844                 opc.sndn = sr->s_ndn;
 845                 opc.suuid = sr->s_uuid;
 846                 opc.sctxcsn = sr->s_csn;
 847                 opc.sreference = sr->s_isreference;
 848                 e = NULL;
 849
 850                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 851                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 852                         if ( rc ) {
 853                                 ch_free( sr );
 854                                 continue;
 855                         }
 856                 }
 857                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 858
 859                 if ( e ) {
 860                         be_entry_release_rw( op, e, 0 );
 861                 }
 862
 863                 ch_free( sr );
 864
 865                 if ( rc )
 866                         break;
 867         }
 868         op->o_bd->bd_info = (BackendInfo *)on;
 869         return rc;
 870 }
 871
 872 /* runqueue task for playing back queued responses */
 873 static void *
 874 syncprov_qtask( void *ctx, void *arg )
 875 {
 876         struct re_s *rtask = arg;
 877         syncops *so = rtask->arg;
 878         slap_overinst *on = so->s_op->o_private;
 879         OperationBuffer opbuf;
 880         Operation *op;
 881         BackendDB be;
 882
 883         op = (Operation *) &opbuf;
 884         *op = *so->s_op;
 885         op->o_hdr = (Opheader *)(op+1);
 886         op->o_controls = (void **)(op->o_hdr+1);
 887         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 888
 889         *op->o_hdr = *so->s_op->o_hdr;
 890
 891         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 892         op->o_tmpmfuncs = &slap_sl_mfuncs;
 893         op->o_threadctx = ctx;
 894
 895         /* syncprov_qplay expects a fake db */
 896         be = *so->s_op->o_bd;
 897         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 898         op->o_bd = &be;
 899         op->o_private = NULL;
 900         op->o_callback = NULL;
 901
 902         syncprov_qplay( op, on, so );
 903
 904         /* decrement use count... */
 905         syncprov_free_syncop( so );
 906
 907         /* wait until we get explicitly scheduled again */
 908         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 909         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 910         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 911         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 912
 913         return NULL;
 914 }
 915
 916 /* Queue a persistent search response */
 917 static int
 918 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 919 {
 920         syncres *sr;
 921
 922         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 923                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 924         sr->s_next = NULL;
 925         sr->s_dn.bv_val = (char *)(sr + 1);
 926         sr->s_dn.bv_len = opc->sdn.bv_len;
 927         sr->s_mode = mode;
 928         sr->s_isreference = opc->sreference;
 929         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 930                  opc->sdn.bv_val ) + 1;
 931         sr->s_ndn.bv_len = opc->sndn.bv_len;
 932         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 933                  opc->sndn.bv_val ) + 1;
 934         sr->s_uuid.bv_len = opc->suuid.bv_len;
 935         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 936         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 937         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 938         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 939
 940         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 941         if ( !so->s_res ) {
 942                 so->s_res = sr;
 943         } else {
 944                 so->s_restail->s_next = sr;
 945         }
 946         so->s_restail = sr;
 947
 948         /* If the base of the psearch was modified, check it next time round */
 949         if ( so->s_flags & PS_WROTE_BASE ) {
 950                 so->s_flags ^= PS_WROTE_BASE;
 951                 so->s_flags |= PS_FIND_BASE;
 952         }
 953         if ( so->s_flags & PS_IS_DETACHED ) {
 954                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 955                 if ( !so->s_qtask ) {
 956                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 957                                 syncprov_qtask, so, "syncprov_qtask",
 958                                 so->s_op->o_conn->c_peer_name.bv_val );
 959                         ++so->s_inuse;
 960                 } else {
 961                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 962                                 !so->s_qtask->next_sched.tv_sec ) {
 963                                 so->s_qtask->interval.tv_sec = 0;
 964                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 965                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 966                                 ++so->s_inuse;
 967                         }
 968                 }
 969                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 970         }
 971         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 972         return LDAP_SUCCESS;
 973 }
 974
 975 static int
 976 syncprov_drop_psearch( syncops *so, int lock )
 977 {
 978         if ( so->s_flags & PS_IS_DETACHED ) {
 979                 if ( lock )
 980                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 981                 so->s_op->o_conn->c_n_ops_executing--;
 982                 so->s_op->o_conn->c_n_ops_completed++;
 983                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 984                         o_next );
 985                 if ( lock )
 986                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 987         }
 988         syncprov_free_syncop( so );
 989
 990         return 0;
 991 }
 992
 993 static int
 994 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 995 {
 996         slap_callback *sc = op->o_callback;
 997         op->o_callback = sc->sc_next;
 998         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 999         op->o_tmpfree( sc, op->o_tmpmemctx );
1000         return 0;
1001 }
1002
1003 static int
1004 syncprov_op_abandon( Operation *op, SlapReply *rs )
1005 {
1006         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1007         syncprov_info_t         *si = on->on_bi.bi_private;
1008         syncops *so, *soprev;
1009
1010         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1011         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1012                 soprev=so, so=so->s_next ) {
1013                 if ( so->s_op->o_connid == op->o_connid &&
1014                         so->s_op->o_msgid == op->orn_msgid ) {
1015                                 so->s_op->o_abandon = 1;
1016                                 soprev->s_next = so->s_next;
1017                                 break;
1018                 }
1019         }
1020         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1021         if ( so ) {
1022                 /* Is this really a Cancel exop? */
1023                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1024                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1025                         rs->sr_err = LDAP_CANCELLED;
1026                         send_ldap_result( so->s_op, rs );
1027                         if ( so->s_flags & PS_IS_DETACHED ) {
1028                                 slap_callback *cb;
1029                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1030                                 cb->sc_cleanup = syncprov_ab_cleanup;
1031                                 cb->sc_next = op->o_callback;
1032                                 cb->sc_private = so;
1033                                 return SLAP_CB_CONTINUE;
1034                         }
1035                 }
1036                 syncprov_drop_psearch( so, 0 );
1037         }
1038         return SLAP_CB_CONTINUE;
1039 }
1040
1041 /* Find which persistent searches are affected by this operation */
1042 static void
1043 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1044 {
1045         slap_overinst *on = opc->son;
1046         syncprov_info_t         *si = on->on_bi.bi_private;
1047
1048         fbase_cookie fc;
1049         syncops *ss, *sprev, *snext;
1050         Entry *e;
1051         Attribute *a;
1052         int rc;
1053         struct berval newdn;
1054         int freefdn = 0;
1055
1056         fc.fdn = &op->o_req_ndn;
1057         /* compute new DN */
1058         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1059                 struct berval pdn;
1060                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1061                 else dnParent( fc.fdn, &pdn );
1062                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1063                 fc.fdn = &newdn;
1064                 freefdn = 1;
1065         }
1066         if ( op->o_tag != LDAP_REQ_ADD ) {
1067                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1068                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1069                 /* If we're sending responses now, make a copy and unlock the DB */
1070                 if ( e && !saveit ) {
1071                         Entry *e2 = entry_dup( e );
1072                         be_entry_release_rw( op, e, 0 );
1073                         e = e2;
1074                 }
1075                 op->o_bd->bd_info = (BackendInfo *)on;
1076                 if ( rc ) return;
1077         } else {
1078                 e = op->ora_e;
1079         }
1080
1081         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1082                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1083                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1084                 opc->sreference = is_entry_referral( e );
1085                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1086                 if ( a )
1087                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1088         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1089                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1090                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1091                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1092                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1093         }
1094
1095         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1096         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1097                 sprev = ss, ss=snext)
1098         {
1099                 syncmatches *sm;
1100                 int found = 0;
1101
1102                 snext = ss->s_next;
1103                 /* validate base */
1104                 fc.fss = ss;
1105                 fc.fbase = 0;
1106                 fc.fscope = 0;
1107
1108                 /* If the base of the search is missing, signal a refresh */
1109                 rc = syncprov_findbase( op, &fc );
1110                 if ( rc != LDAP_SUCCESS ) {
1111                         SlapReply rs = {REP_RESULT};
1112                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1113                                 "search base has changed" );
1114                         sprev->s_next = snext;
1115                         syncprov_drop_psearch( ss, 1 );
1116                         ss = sprev;
1117                         continue;
1118                 }
1119
1120
1121                 /* If we're sending results now, look for this op in old matches */
1122                 if ( !saveit ) {
1123                         syncmatches *old;
1124
1125                         /* Did we modify the search base? */
1126                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1127                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1128                                 ss->s_flags |= PS_WROTE_BASE;
1129                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1130                         }
1131
1132                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1133                                 old=sm, sm=sm->sm_next ) {
1134                                 if ( sm->sm_op == ss ) {
1135                                         found = 1;
1136                                         old->sm_next = sm->sm_next;
1137                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1138                                         break;
1139                                 }
1140                         }
1141                 }
1142
1143                 /* check if current o_req_dn is in scope and matches filter */
1144                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1145                         LDAP_COMPARE_TRUE ) {
1146                         if ( saveit ) {
1147                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1148                                 sm->sm_next = opc->smatches;
1149                                 sm->sm_op = ss;
1150                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1151                                 ++ss->s_inuse;
1152                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1153                                 opc->smatches = sm;
1154                         } else {
1155                                 /* if found send UPDATE else send ADD */
1156                                 syncprov_qresp( opc, ss,
1157                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1158                         }
1159                 } else if ( !saveit && found ) {
1160                         /* send DELETE */
1161                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1162                 }
1163         }
1164         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1165
1166         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1167                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1168                 be_entry_release_rw( op, e, 0 );
1169                 op->o_bd->bd_info = (BackendInfo *)on;
1170         }
1171         if ( freefdn ) {
1172                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1173         }
1174 }
1175
1176 static int
1177 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1178 {
1179         slap_callback *cb = op->o_callback;
1180         opcookie *opc = cb->sc_private;
1181         slap_overinst *on = opc->son;
1182         syncprov_info_t         *si = on->on_bi.bi_private;
1183         syncmatches *sm, *snext;
1184         modtarget *mt, mtdummy;
1185
1186         for (sm = opc->smatches; sm; sm=snext) {
1187                 snext = sm->sm_next;
1188                 syncprov_free_syncop( sm->sm_op );
1189                 op->o_tmpfree( sm, op->o_tmpmemctx );
1190         }
1191
1192         /* Remove op from lock table */
1193         mtdummy.mt_op = op;
1194         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1195         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1196         if ( mt ) {
1197                 modinst *mi = mt->mt_mods;
1198
1199                 /* If there are more, promote the next one */
1200                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1201                 if ( mi->mi_next ) {
1202                         mt->mt_mods = mi->mi_next;
1203                         mt->mt_op = mt->mt_mods->mi_op;
1204                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1205                 } else {
1206                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1207                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1208                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1209                         ch_free( mt );
1210                 }
1211         }
1212         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1213         if ( !BER_BVISNULL( &opc->suuid ))
1214                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1215         if ( !BER_BVISNULL( &opc->sndn ))
1216                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1217         if ( !BER_BVISNULL( &opc->sdn ))
1218                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1219         op->o_callback = cb->sc_next;
1220         op->o_tmpfree(cb, op->o_tmpmemctx);
1221
1222         return 0;
1223 }
1224
1225 static void
1226 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1227 {
1228         syncprov_info_t         *si = on->on_bi.bi_private;
1229         Modifications mod;
1230         Operation opm;
1231         SlapReply rsm = { 0 };
1232         struct berval bv[2];
1233         slap_callback cb = {0};
1234
1235         mod.sml_values = bv;
1236         bv[1].bv_val = NULL;
1237         bv[0] = si->si_ctxcsn;
1238         mod.sml_nvalues = NULL;
1239         mod.sml_desc = slap_schema.si_ad_contextCSN;
1240         mod.sml_op = LDAP_MOD_REPLACE;
1241         mod.sml_flags = 0;
1242         mod.sml_next = NULL;
1243
1244         cb.sc_response = slap_null_cb;
1245         opm = *op;
1246         opm.o_tag = LDAP_REQ_MODIFY;
1247         opm.o_callback = &cb;
1248         opm.orm_modlist = &mod;
1249         opm.o_req_dn = op->o_bd->be_suffix[0];
1250         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1251         opm.o_bd->bd_info = on->on_info->oi_orig;
1252         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1253         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1254         opm.o_bd->be_modify( &opm, &rsm );
1255         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1256         if ( mod.sml_next != NULL ) {
1257                 slap_mods_free( mod.sml_next, 1 );
1258         }
1259 }
1260
1261 static void
1262 syncprov_add_slog( Operation *op, struct berval *csn )
1263 {
1264         opcookie *opc = op->o_callback->sc_private;
1265         slap_overinst *on = opc->son;
1266         syncprov_info_t         *si = on->on_bi.bi_private;
1267         sessionlog *sl;
1268         slog_entry *se;
1269
1270         sl = si->si_logs;
1271         {
1272                 /* Allocate a record. UUIDs are not NUL-terminated. */
1273                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1274                         csn->bv_len + 1 );
1275                 se->se_next = NULL;
1276                 se->se_tag = op->o_tag;
1277
1278                 se->se_uuid.bv_val = (char *)(se+1);
1279                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1280                 se->se_uuid.bv_len = opc->suuid.bv_len;
1281
1282                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1283                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1284                 se->se_csn.bv_val[csn->bv_len] = '\0';
1285                 se->se_csn.bv_len = csn->bv_len;
1286
1287                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1288                 if ( sl->sl_head ) {
1289                         sl->sl_tail->se_next = se;
1290                 } else {
1291                         sl->sl_head = se;
1292                 }
1293                 sl->sl_tail = se;
1294                 sl->sl_num++;
1295                 while ( sl->sl_num > sl->sl_size ) {
1296                         se = sl->sl_head;
1297                         sl->sl_head = se->se_next;
1298                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1299                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1300                         ch_free( se );
1301                         sl->sl_num--;
1302                         if ( !sl->sl_head ) {
1303                                 sl->sl_tail = NULL;
1304                         }
1305                 }
1306                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1307         }
1308 }
1309
1310 /* Just set a flag if we found the matching entry */
1311 static int
1312 playlog_cb( Operation *op, SlapReply *rs )
1313 {
1314         if ( rs->sr_type == REP_SEARCH ) {
1315                 op->o_callback->sc_private = (void *)1;
1316         }
1317         return rs->sr_err;
1318 }
1319
1320 /* enter with sl->sl_mutex locked, release before returning */
1321 static void
1322 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1323         struct berval *oldcsn, struct berval *ctxcsn )
1324 {
1325         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1326         slog_entry *se;
1327         int i, j, ndel, num, nmods, mmods;
1328         BerVarray uuids;
1329
1330         if ( !sl->sl_num ) {
1331                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1332                 return;
1333         }
1334
1335         num = sl->sl_num;
1336         i = 0;
1337         nmods = 0;
1338
1339         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1340                 num * UUID_LEN, op->o_tmpmemctx );
1341
1342         uuids[0].bv_val = (char *)(uuids + num + 1);
1343
1344         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1345          * and everything else at the end. Do this first so we can
1346          * unlock the list mutex.
1347          */
1348         for ( se=sl->sl_head; se; se=se->se_next ) {
1349                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1350                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1351                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1352                         j = i;
1353                         i++;
1354                 } else {
1355                         nmods++;
1356                         j = num - nmods;
1357                 }
1358                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1359                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1360                 uuids[j].bv_len = UUID_LEN;
1361         }
1362         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1363
1364         ndel = i;
1365
1366         /* Zero out unused slots */
1367         for ( i=ndel; i < num - nmods; i++ )
1368                 uuids[i].bv_len = 0;
1369
1370         /* Mods must be validated to see if they belong in this delete set.
1371          */
1372
1373         mmods = nmods;
1374         /* Strip any duplicates */
1375         for ( i=0; i<nmods; i++ ) {
1376                 for ( j=0; j<ndel; j++ ) {
1377                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1378                                 uuids[num - 1 - i].bv_len = 0;
1379                                 mmods --;
1380                                 break;
1381                         }
1382                 }
1383                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1384                 for ( j=0; j<i; j++ ) {
1385                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1386                                 uuids[num - 1 - i].bv_len = 0;
1387                                 mmods --;
1388                                 break;
1389                         }
1390                 }
1391         }
1392
1393         if ( mmods ) {
1394                 Operation fop;
1395                 SlapReply frs = { REP_RESULT };
1396                 int rc;
1397                 Filter mf, af;
1398 #ifdef LDAP_COMP_MATCH
1399                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1400 #else
1401                 AttributeAssertion eq;
1402 #endif
1403                 slap_callback cb = {0};
1404
1405                 fop = *op;
1406
1407                 fop.o_sync_mode = 0;
1408                 fop.o_callback = &cb;
1409                 fop.ors_limit = NULL;
1410                 fop.ors_tlimit = SLAP_NO_LIMIT;
1411                 fop.ors_attrs = slap_anlist_all_attributes;
1412                 fop.ors_attrsonly = 0;
1413                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1414
1415                 af.f_choice = LDAP_FILTER_AND;
1416                 af.f_next = NULL;
1417                 af.f_and = &mf;
1418                 mf.f_choice = LDAP_FILTER_EQUALITY;
1419                 mf.f_ava = &eq;
1420                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1421                 mf.f_next = fop.ors_filter;
1422
1423                 fop.ors_filter = &af;
1424
1425                 cb.sc_response = playlog_cb;
1426                 fop.o_bd->bd_info = on->on_info->oi_orig;
1427
1428                 for ( i=ndel; i<num; i++ ) {
1429                         if ( uuids[i].bv_len == 0 ) continue;
1430
1431                         mf.f_av_value = uuids[i];
1432                         cb.sc_private = NULL;
1433                         fop.ors_slimit = 1;
1434                         rc = fop.o_bd->be_search( &fop, &frs );
1435
1436                         /* If entry was not found, add to delete list */
1437                         if ( !cb.sc_private ) {
1438                                 uuids[ndel++] = uuids[i];
1439                         }
1440                 }
1441                 fop.o_bd->bd_info = (BackendInfo *)on;
1442         }
1443         if ( ndel ) {
1444                 uuids[ndel].bv_val = NULL;
1445                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1446         }
1447 }
1448
1449 static int
1450 syncprov_op_response( Operation *op, SlapReply *rs )
1451 {
1452         opcookie *opc = op->o_callback->sc_private;
1453         slap_overinst *on = opc->son;
1454         syncprov_info_t         *si = on->on_bi.bi_private;
1455         syncmatches *sm;
1456
1457         if ( rs->sr_err == LDAP_SUCCESS )
1458         {
1459                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1460                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1461
1462                 /* Update our context CSN */
1463                 cbuf[0] = '\0';
1464                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1465                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1466                 if ( !BER_BVISNULL( &maxcsn ) ) {
1467                         strcpy( cbuf, maxcsn.bv_val );
1468                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1469                                 strcpy( si->si_ctxcsnbuf, cbuf );
1470                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1471                         }
1472                 }
1473
1474                 /* Don't do any processing for consumer contextCSN updates */
1475                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1476                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1477                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1478                         return SLAP_CB_CONTINUE;
1479                 }
1480
1481                 si->si_numops++;
1482                 if ( si->si_chkops || si->si_chktime ) {
1483                         int do_check=0;
1484                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1485                                 do_check = 1;
1486                                 si->si_numops = 0;
1487                         }
1488                         if ( si->si_chktime &&
1489                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1490                                 do_check = 1;
1491                                 si->si_chklast = op->o_time;
1492                         }
1493                         if ( do_check ) {
1494                                 syncprov_checkpoint( op, rs, on );
1495                         }
1496                 }
1497                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1498
1499                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1500                 opc->sctxcsn.bv_val = cbuf;
1501
1502                 /* Handle any persistent searches */
1503                 if ( si->si_ops ) {
1504                         switch(op->o_tag) {
1505                         case LDAP_REQ_ADD:
1506                         case LDAP_REQ_MODIFY:
1507                         case LDAP_REQ_MODRDN:
1508                         case LDAP_REQ_EXTENDED:
1509                                 syncprov_matchops( op, opc, 0 );
1510                                 break;
1511                         case LDAP_REQ_DELETE:
1512                                 /* for each match in opc->smatches:
1513                                  *   send DELETE msg
1514                                  */
1515                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1516                                         if ( sm->sm_op->s_op->o_abandon )
1517                                                 continue;
1518                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1519                                 }
1520                                 break;
1521                         }
1522                 }
1523
1524                 /* Add any log records */
1525                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1526                         syncprov_add_slog( op, &curcsn );
1527                 }
1528
1529         }
1530         return SLAP_CB_CONTINUE;
1531 }
1532
1533 /* We don't use a subentry to store the context CSN any more.
1534  * We expose the current context CSN as an operational attribute
1535  * of the suffix entry.
1536  */
1537 static int
1538 syncprov_op_compare( Operation *op, SlapReply *rs )
1539 {
1540         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1541         syncprov_info_t         *si = on->on_bi.bi_private;
1542         int rc = SLAP_CB_CONTINUE;
1543
1544         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1545                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1546         {
1547                 Entry e = {0};
1548                 Attribute a = {0};
1549                 struct berval bv[2];
1550
1551                 e.e_name = op->o_bd->be_suffix[0];
1552                 e.e_nname = op->o_bd->be_nsuffix[0];
1553
1554                 BER_BVZERO( &bv[1] );
1555                 bv[0] = si->si_ctxcsn;
1556
1557                 a.a_desc = slap_schema.si_ad_contextCSN;
1558                 a.a_vals = bv;
1559                 a.a_nvals = a.a_vals;
1560
1561                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1562
1563                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1564                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1565                 if ( ! rs->sr_err ) {
1566                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1567                         goto return_results;
1568                 }
1569
1570                 if ( get_assert( op ) &&
1571                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1572                 {
1573                         rs->sr_err = LDAP_ASSERTION_FAILED;
1574                         goto return_results;
1575                 }
1576
1577
1578                 rs->sr_err = LDAP_COMPARE_FALSE;
1579
1580                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1581                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1582                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1583                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1584                 {
1585                         rs->sr_err = LDAP_COMPARE_TRUE;
1586                 }
1587
1588 return_results:;
1589
1590                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1591
1592                 send_ldap_result( op, rs );
1593
1594                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1595                         rs->sr_err = LDAP_SUCCESS;
1596                 }
1597                 rc = rs->sr_err;
1598         }
1599
1600         return rc;
1601 }
1602
1603 static int
1604 syncprov_op_mod( Operation *op, SlapReply *rs )
1605 {
1606         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1607         syncprov_info_t         *si = on->on_bi.bi_private;
1608
1609         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1610                 sizeof(opcookie) +
1611                 (si->si_ops ? sizeof(modinst) : 0 ),
1612                 op->o_tmpmemctx);
1613         opcookie *opc = (opcookie *)(cb+1);
1614         opc->son = on;
1615         cb->sc_response = syncprov_op_response;
1616         cb->sc_cleanup = syncprov_op_cleanup;
1617         cb->sc_private = opc;
1618         cb->sc_next = op->o_callback;
1619         op->o_callback = cb;
1620
1621         /* If there are active persistent searches, lock this operation.
1622          * See seqmod.c for the locking logic on its own.
1623          */
1624         if ( si->si_ops ) {
1625                 modtarget *mt, mtdummy;
1626                 modinst *mi;
1627
1628                 mi = (modinst *)(opc+1);
1629                 mi->mi_op = op;
1630
1631                 /* See if we're already modifying this entry... */
1632                 mtdummy.mt_op = op;
1633                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1634                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1635                 if ( mt ) {
1636                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1637                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1638                         mt->mt_tail->mi_next = mi;
1639                         mt->mt_tail = mi;
1640                         /* wait for this op to get to head of list */
1641                         while ( mt->mt_mods != mi ) {
1642                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1643                                 ldap_pvt_thread_yield();
1644                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1645
1646                                 /* clean up if the caller is giving up */
1647                                 if ( op->o_abandon ) {
1648                                         modinst *m2;
1649                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1650                                                 m2 = m2->mi_next );
1651                                         m2->mi_next = mi->mi_next;
1652                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1653                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1654                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1655                                         return SLAPD_ABANDON;
1656                                 }
1657                         }
1658                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1659                 } else {
1660                         /* Record that we're modifying this entry now */
1661                         mt = ch_malloc( sizeof(modtarget) );
1662                         mt->mt_mods = mi;
1663                         mt->mt_tail = mi;
1664                         mt->mt_op = mi->mi_op;
1665                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1666                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1667                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1668                 }
1669         }
1670
1671         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1672                 syncprov_matchops( op, opc, 1 );
1673
1674         return SLAP_CB_CONTINUE;
1675 }
1676
1677 static int
1678 syncprov_op_extended( Operation *op, SlapReply *rs )
1679 {
1680         if ( exop_is_write( op ))
1681                 return syncprov_op_mod( op, rs );
1682
1683         return SLAP_CB_CONTINUE;
1684 }
1685
1686 typedef struct searchstate {
1687         slap_overinst *ss_on;
1688         syncops *ss_so;
1689         int ss_present;
1690         struct berval ss_ctxcsn;
1691         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1692 } searchstate;
1693
1694 static int
1695 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1696 {
1697         if ( rs->sr_ctrls ) {
1698                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1699                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1700                 rs->sr_ctrls = NULL;
1701         }
1702         return 0;
1703 }
1704
1705 static void
1706 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1707 {
1708         Operation *op2;
1709         int i, alen = 0;
1710         size_t size;
1711         char *ptr;
1712         GroupAssertion *g1, *g2;
1713
1714         /* count the search attrs */
1715         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1716                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1717         }
1718         /* Make a new copy of the operation */
1719         size = sizeof(Operation) + sizeof(Opheader) +
1720                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1721                 op->o_req_dn.bv_len + 1 +
1722                 op->o_req_ndn.bv_len + 1 +
1723                 op->o_ndn.bv_len + 1 +
1724                 so->s_filterstr.bv_len + 1;
1725         op2 = (Operation *)ch_calloc( 1, size );
1726         op2->o_hdr = (Opheader *)(op2+1);
1727
1728         /* Copy the fields we care about explicitly, leave the rest alone */
1729         *op2->o_hdr = *op->o_hdr;
1730         op2->o_tag = op->o_tag;
1731         op2->o_time = op->o_time;
1732         op2->o_bd = on->on_info->oi_origdb;
1733         op2->o_request = op->o_request;
1734         op2->o_private = on;
1735
1736         if ( i ) {
1737                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1738                 ptr = (char *)(op2->ors_attrs+i+1);
1739                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1740                         op2->ors_attrs[i] = op->ors_attrs[i];
1741                         op2->ors_attrs[i].an_name.bv_val = ptr;
1742                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1743                 }
1744                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1745         } else {
1746                 ptr = (char *)(op2->o_hdr + 1);
1747         }
1748         op2->o_authz = op->o_authz;
1749         op2->o_ndn.bv_val = ptr;
1750         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1751         op2->o_dn = op2->o_ndn;
1752         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1753         op2->o_req_dn.bv_val = ptr;
1754         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1755         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1756         op2->o_req_ndn.bv_val = ptr;
1757         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1758         op2->ors_filterstr.bv_val = ptr;
1759         strcpy( ptr, so->s_filterstr.bv_val );
1760         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1761         op2->ors_filter = str2filter( ptr );
1762         so->s_op = op2;
1763
1764         /* Copy any cached group ACLs individually */
1765         op2->o_groups = NULL;
1766         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1767                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1768                 *g2 = *g1;
1769                 strcpy( g2->ga_ndn, g1->ga_ndn );
1770                 g2->ga_next = op2->o_groups;
1771                 op2->o_groups = g2;
1772         }
1773         /* Don't allow any further group caching */
1774         op2->o_do_not_cache = 1;
1775
1776         /* Add op2 to conn so abandon will find us */
1777         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1778         op->o_conn->c_n_ops_executing++;
1779         op->o_conn->c_n_ops_completed--;
1780         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1781         so->s_flags |= PS_IS_DETACHED;
1782         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1783 }
1784
1785 static int
1786 syncprov_search_response( Operation *op, SlapReply *rs )
1787 {
1788         searchstate *ss = op->o_callback->sc_private;
1789         slap_overinst *on = ss->ss_on;
1790         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1791
1792         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1793                 Attribute *a;
1794                 /* If we got a referral without a referral object, there's
1795                  * something missing that we cannot replicate. Just ignore it.
1796                  * The consumer will abort because we didn't send the expected
1797                  * control.
1798                  */
1799                 if ( !rs->sr_entry ) {
1800                         assert( rs->sr_entry != NULL );
1801                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1802                         return SLAP_CB_CONTINUE;
1803                 }
1804                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1805                 if ( a ) {
1806                         /* Make sure entry is less than the snaphot'd contextCSN */
1807                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1808                                 return LDAP_SUCCESS;
1809
1810                         /* Don't send the ctx entry twice */
1811                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1812                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1813                                 return LDAP_SUCCESS;
1814                 }
1815                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1816                         op->o_tmpmemctx );
1817                 rs->sr_ctrls[1] = NULL;
1818                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1819                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1820         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1821                 struct berval cookie;
1822
1823                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1824                         srs->sr_state.rid );
1825
1826                 /* Is this a regular refresh? */
1827                 if ( !ss->ss_so ) {
1828                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1829                                 op->o_tmpmemctx );
1830                         rs->sr_ctrls[1] = NULL;
1831                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1832                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1833                                         LDAP_SYNC_REFRESH_DELETES );
1834                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1835                 } else {
1836                 /* It's RefreshAndPersist, transition to Persist phase */
1837                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1838                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1839                                 &cookie, 1, NULL, 0 );
1840                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1841
1842                         /* Detach this Op from frontend control */
1843                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1844
1845                         /* Turn off the refreshing flag */
1846                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1847
1848                         syncprov_detach_op( op, ss->ss_so, on );
1849                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1850
1851                         return LDAP_SUCCESS;
1852                 }
1853         }
1854
1855         return SLAP_CB_CONTINUE;
1856 }
1857
1858 static int
1859 syncprov_op_search( Operation *op, SlapReply *rs )
1860 {
1861         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1862         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1863         slap_callback   *cb;
1864         int gotstate = 0, nochange = 0, do_present;
1865         syncops *sop = NULL;
1866         searchstate *ss;
1867         sync_control *srs;
1868         struct berval ctxcsn;
1869         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1870
1871         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1872
1873         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1874                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1875                 return rs->sr_err;
1876         }
1877
1878         do_present = si->si_nopres ? 0 : 1;
1879
1880         srs = op->o_controls[slap_cids.sc_LDAPsync];
1881         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1882
1883         /* If this is a persistent search, set it up right away */
1884         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1885                 syncops so = {0};
1886                 fbase_cookie fc;
1887                 opcookie opc;
1888                 slap_callback sc;
1889
1890                 fc.fss = &so;
1891                 fc.fbase = 0;
1892                 so.s_eid = NOID;
1893                 so.s_op = op;
1894                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1895                 /* syncprov_findbase expects to be called as a callback... */
1896                 sc.sc_private = &opc;
1897                 opc.son = on;
1898                 cb = op->o_callback;
1899                 op->o_callback = &sc;
1900                 rs->sr_err = syncprov_findbase( op, &fc );
1901                 op->o_callback = cb;
1902
1903                 if ( rs->sr_err != LDAP_SUCCESS ) {
1904                         send_ldap_result( op, rs );
1905                         return rs->sr_err;
1906                 }
1907                 sop = ch_malloc( sizeof( syncops ));
1908                 *sop = so;
1909                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1910                 sop->s_rid = srs->sr_state.rid;
1911                 sop->s_inuse = 1;
1912
1913                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1914                 sop->s_next = si->si_ops;
1915                 si->si_ops = sop;
1916                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1917         }
1918
1919         /* snapshot the ctxcsn */
1920         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1921         strcpy( csnbuf, si->si_ctxcsnbuf );
1922         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1923         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1924         ctxcsn.bv_val = csnbuf;
1925
1926         /* If we have a cookie, handle the PRESENT lookups */
1927         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1928                 sessionlog *sl;
1929
1930                 /* The cookie was validated when it was parsed, just use it */
1931
1932                 /* If just Refreshing and nothing has changed, shortcut it */
1933                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1934                         nochange = 1;
1935                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1936                                 LDAPControl     *ctrls[2];
1937
1938                                 ctrls[0] = NULL;
1939                                 ctrls[1] = NULL;
1940                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1941                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1942                                 rs->sr_ctrls = ctrls;
1943                                 rs->sr_err = LDAP_SUCCESS;
1944                                 send_ldap_result( op, rs );
1945                                 rs->sr_ctrls = NULL;
1946                                 return rs->sr_err;
1947                         }
1948                         goto shortcut;
1949                 }
1950                 /* Do we have a sessionlog for this search? */
1951                 sl=si->si_logs;
1952                 if ( sl ) {
1953                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1954                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1955                                 do_present = 0;
1956                                 /* mutex is unlocked in playlog */
1957                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1958                         } else {
1959                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1960                         }
1961                 }
1962                 /* Is the CSN still present in the database? */
1963                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1964                         /* No, so a reload is required */
1965                         /* the 2.2 consumer doesn't send this hint */
1966                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1967                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1968                                 return rs->sr_err;
1969                         }
1970                 } else {
1971                         gotstate = 1;
1972                         /* If changed and doing Present lookup, send Present UUIDs */
1973                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1974                                 LDAP_SUCCESS ) {
1975                                 send_ldap_result( op, rs );
1976                                 return rs->sr_err;
1977                         }
1978                 }
1979         }
1980
1981 shortcut:
1982         /* Append CSN range to search filter, save original filter
1983          * for persistent search evaluation
1984          */
1985         if ( sop ) {
1986                 sop->s_filterstr= op->ors_filterstr;
1987         }
1988
1989         /* If something changed, find the changes */
1990         if ( gotstate && !nochange ) {
1991                 Filter *fand, *fava;
1992
1993                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1994                 fand->f_choice = LDAP_FILTER_AND;
1995                 fand->f_next = NULL;
1996                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1997                 fand->f_and = fava;
1998                 fava->f_choice = LDAP_FILTER_GE;
1999                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2000                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2001 #ifdef LDAP_COMP_MATCH
2002                 fava->f_ava->aa_cf = NULL;
2003 #endif
2004                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2005                 fava->f_next = op->ors_filter;
2006                 op->ors_filter = fand;
2007                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2008         }
2009
2010         /* Let our callback add needed info to returned entries */
2011         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2012         ss = (searchstate *)(cb+1);
2013         ss->ss_on = on;
2014         ss->ss_so = sop;
2015         ss->ss_present = do_present;
2016         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2017         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2018         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2019         cb->sc_response = syncprov_search_response;
2020         cb->sc_cleanup = syncprov_search_cleanup;
2021         cb->sc_private = ss;
2022         cb->sc_next = op->o_callback;
2023         op->o_callback = cb;
2024
2025 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2026         op->o_sync_mode &= SLAP_CONTROL_MASK;
2027 #endif
2028
2029         /* If this is a persistent search and no changes were reported during
2030          * the refresh phase, just invoke the response callback to transition
2031          * us into persist phase
2032          */
2033         if ( nochange ) {
2034                 rs->sr_err = LDAP_SUCCESS;
2035                 rs->sr_nentries = 0;
2036                 send_ldap_result( op, rs );
2037                 return rs->sr_err;
2038         }
2039         return SLAP_CB_CONTINUE;
2040 }
2041
2042 static int
2043 syncprov_operational(
2044         Operation *op,
2045         SlapReply *rs )
2046 {
2047         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2048         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2049
2050         if ( rs->sr_entry &&
2051                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2052
2053                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2054                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2055                         Attribute *a, **ap = NULL;
2056
2057                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2058                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2059                                         break;
2060                         }
2061
2062                         if ( !a ) {
2063                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2064
2065                                 a = ch_malloc( sizeof(Attribute));
2066                                 a->a_desc = slap_schema.si_ad_contextCSN;
2067                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2068                                 a->a_vals[1].bv_val = NULL;
2069                                 a->a_nvals = a->a_vals;
2070                                 a->a_next = NULL;
2071                                 a->a_flags = 0;
2072                                 *ap = a;
2073                         }
2074
2075                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2076                         if ( !ap ) {
2077                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2078                         } else {
2079                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2080                         }
2081                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2082                 }
2083         }
2084         return SLAP_CB_CONTINUE;
2085 }
2086
2087 enum {
2088         SP_CHKPT = 1,
2089         SP_SESSL,
2090         SP_NOPRES,
2091         SP_USEHINT
2092 };
2093
2094 static ConfigDriver sp_cf_gen;
2095
2096 static ConfigTable spcfg[] = {
2097         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2098                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2099                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2100                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2101         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2102                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2103                         "DESC 'Session log size in ops' "
2104                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2105         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2106                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2107                         "DESC 'Omit Present phase processing' "
2108                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2109         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2110                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2111                         "DESC 'Observe Reload Hint in Request control' "
2112                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2113         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2114 };
2115
2116 static ConfigOCs spocs[] = {
2117         { "( OLcfgOvOc:1.1 "
2118                 "NAME 'olcSyncProvConfig' "
2119                 "DESC 'SyncRepl Provider configuration' "
2120                 "SUP olcOverlayConfig "
2121                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2122                         Cft_Overlay, spcfg },
2123         { NULL, 0, NULL }
2124 };
2125
2126 static int
2127 sp_cf_gen(ConfigArgs *c)
2128 {
2129         slap_overinst           *on = (slap_overinst *)c->bi;
2130         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2131         int rc = 0;
2132
2133         if ( c->op == SLAP_CONFIG_EMIT ) {
2134                 switch ( c->type ) {
2135                 case SP_CHKPT:
2136                         if ( si->si_chkops || si->si_chktime ) {
2137                                 struct berval bv;
2138                                 bv.bv_len = sprintf( c->msg, "%d %d",
2139                                         si->si_chkops, si->si_chktime );
2140                                 bv.bv_val = c->msg;
2141                                 value_add_one( &c->rvalue_vals, &bv );
2142                         } else {
2143                                 rc = 1;
2144                         }
2145                         break;
2146                 case SP_SESSL:
2147                         if ( si->si_logs ) {
2148                                 c->value_int = si->si_logs->sl_size;
2149                         } else {
2150                                 rc = 1;
2151                         }
2152                         break;
2153                 case SP_NOPRES:
2154                         if ( si->si_nopres ) {
2155                                 c->value_int = 1;
2156                         } else {
2157                                 rc = 1;
2158                         }
2159                         break;
2160                 case SP_USEHINT:
2161                         if ( si->si_usehint ) {
2162                                 c->value_int = 1;
2163                         } else {
2164                                 rc = 1;
2165                         }
2166                         break;
2167                 }
2168                 return rc;
2169         } else if ( c->op == LDAP_MOD_DELETE ) {
2170                 switch ( c->type ) {
2171                 case SP_CHKPT:
2172                         si->si_chkops = 0;
2173                         si->si_chktime = 0;
2174                         break;
2175                 case SP_SESSL:
2176                         if ( si->si_logs )
2177                                 si->si_logs->sl_size = 0;
2178                         else
2179                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2180                         break;
2181                 case SP_NOPRES:
2182                         if ( si->si_nopres )
2183                                 si->si_nopres = 0;
2184                         else
2185                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2186                         break;
2187                 case SP_USEHINT:
2188                         if ( si->si_usehint )
2189                                 si->si_usehint = 0;
2190                         else
2191                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2192                         break;
2193                 }
2194                 return rc;
2195         }
2196         switch ( c->type ) {
2197         case SP_CHKPT:
2198                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2199                         sprintf( c->msg, "%s unable to parse checkpoint ops # \"%s\"",
2200                                 c->argv[0], c->argv[1] );
2201                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2202                         return ARG_BAD_CONF;
2203                 }
2204                 if ( si->si_chkops <= 0 ) {
2205                         sprintf( c->msg, "%s invalid checkpoint ops # \"%d\"",
2206                                 c->argv[0], si->si_chkops );
2207                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2208                         return ARG_BAD_CONF;
2209                 }
2210                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2211                         sprintf( c->msg, "%s unable to parse checkpoint time \"%s\"",
2212                                 c->argv[0], c->argv[1] );
2213                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2214                         return ARG_BAD_CONF;
2215                 }
2216                 if ( si->si_chktime <= 0 ) {
2217                         sprintf( c->msg, "%s invalid checkpoint time \"%d\"",
2218                                 c->argv[0], si->si_chkops );
2219                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2220                         return ARG_BAD_CONF;
2221                 }
2222                 si->si_chktime *= 60;
2223                 break;
2224         case SP_SESSL: {
2225                 sessionlog *sl;
2226                 int size = c->value_int;
2227
2228                 if ( size < 0 ) {
2229                         sprintf( c->msg, "%s size %d is negative",
2230                                 c->argv[0], size );
2231                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2232                         return ARG_BAD_CONF;
2233                 }
2234                 sl = si->si_logs;
2235                 if ( !sl ) {
2236                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2237                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2238                         sl->sl_mincsn.bv_len = 0;
2239                         sl->sl_num = 0;
2240                         sl->sl_head = sl->sl_tail = NULL;
2241                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2242                         si->si_logs = sl;
2243                 }
2244                 sl->sl_size = size;
2245                 }
2246                 break;
2247         case SP_NOPRES:
2248                 si->si_nopres = c->value_int;
2249                 break;
2250         case SP_USEHINT:
2251                 si->si_usehint = c->value_int;
2252                 break;
2253         }
2254         return rc;
2255 }
2256
2257 /* ITS#3456 we cannot run this search on the main thread, must use a
2258  * child thread in order to insure we have a big enough stack.
2259  */
2260 static void *
2261 syncprov_db_otask(
2262         void *ptr
2263 )
2264 {
2265         syncprov_findcsn( ptr, FIND_MAXCSN );
2266         return NULL;
2267 }
2268
2269 /* Read any existing contextCSN from the underlying db.
2270  * Then search for any entries newer than that. If no value exists,
2271  * just generate it. Cache whatever result.
2272  */
2273 static int
2274 syncprov_db_open(
2275     BackendDB *be
2276 )
2277 {
2278         slap_overinst   *on = (slap_overinst *) be->bd_info;
2279         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2280
2281         Connection conn;
2282         OperationBuffer opbuf;
2283         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2284         Operation *op = (Operation *) &opbuf;
2285         Entry *e;
2286         Attribute *a;
2287         int rc;
2288         void *thrctx = NULL;
2289
2290         if ( slapMode & SLAP_TOOL_MODE ) {
2291                 return 0;
2292         }
2293
2294         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2295         if ( rc ) {
2296                 return rc;
2297         }
2298
2299         thrctx = ldap_pvt_thread_pool_context();
2300         connection_fake_init( &conn, op, thrctx );
2301         op->o_bd = be;
2302         op->o_dn = be->be_rootdn;
2303         op->o_ndn = be->be_rootndn;
2304
2305         ctxcsnbuf[0] = '\0';
2306
2307         op->o_bd->bd_info = on->on_info->oi_orig;
2308         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2309                 slap_schema.si_ad_contextCSN, 0, &e );
2310
2311         if ( e ) {
2312                 ldap_pvt_thread_t tid;
2313
2314                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2315                 if ( a ) {
2316                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2317                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2318                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2319                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2320                                 si->si_ctxcsn.bv_len );
2321                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2322                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2323                 }
2324                 be_entry_release_rw( op, e, 0 );
2325                 op->o_bd->bd_info = (BackendInfo *)on;
2326                 op->o_req_dn = be->be_suffix[0];
2327                 op->o_req_ndn = be->be_nsuffix[0];
2328                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2329                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2330                 ldap_pvt_thread_join( tid, NULL );
2331         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2332                 /* If we're also a consumer, and we didn't find the context entry,
2333                  * then don't generate anything, wait for our provider to send it
2334                  * to us.
2335                  */
2336                 goto out;
2337         }
2338
2339         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2340                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2341                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2342         }
2343
2344         /* If our ctxcsn is different from what was read from the root
2345          * entry, make sure we do a checkpoint on close
2346          */
2347         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2348                 si->si_numops++;
2349         }
2350
2351 out:
2352         op->o_bd->bd_info = (BackendInfo *)on;
2353         ldap_pvt_thread_pool_context_reset( thrctx );
2354         return 0;
2355 }
2356
2357 /* Write the current contextCSN into the underlying db.
2358  */
2359 static int
2360 syncprov_db_close(
2361     BackendDB *be
2362 )
2363 {
2364     slap_overinst   *on = (slap_overinst *) be->bd_info;
2365     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2366
2367         if ( slapMode & SLAP_TOOL_MODE ) {
2368                 return 0;
2369         }
2370         if ( si->si_numops ) {
2371                 Connection conn;
2372                 OperationBuffer opbuf;
2373                 Operation *op = (Operation *) &opbuf;
2374                 SlapReply rs = {REP_RESULT};
2375                 void *thrctx;
2376
2377                 thrctx = ldap_pvt_thread_pool_context();
2378                 connection_fake_init( &conn, op, thrctx );
2379                 op->o_bd = be;
2380                 op->o_dn = be->be_rootdn;
2381                 op->o_ndn = be->be_rootndn;
2382                 syncprov_checkpoint( op, &rs, on );
2383                 ldap_pvt_thread_pool_context_reset( thrctx );
2384         }
2385
2386     return 0;
2387 }
2388
2389 static int
2390 syncprov_db_init(
2391         BackendDB *be
2392 )
2393 {
2394         slap_overinst   *on = (slap_overinst *)be->bd_info;
2395         syncprov_info_t *si;
2396
2397         si = ch_calloc(1, sizeof(syncprov_info_t));
2398         on->on_bi.bi_private = si;
2399         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2400         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2401         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2402         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2403
2404         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2405         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2406         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2407         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2408
2409         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2410         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2411
2412         return 0;
2413 }
2414
2415 static int
2416 syncprov_db_destroy(
2417         BackendDB *be
2418 )
2419 {
2420         slap_overinst   *on = (slap_overinst *)be->bd_info;
2421         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2422
2423         if ( si ) {
2424                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2425                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2426                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2427                 ch_free( si );
2428         }
2429
2430         return 0;
2431 }
2432
2433 static int syncprov_parseCtrl (
2434         Operation *op,
2435         SlapReply *rs,
2436         LDAPControl *ctrl )
2437 {
2438         ber_tag_t tag;
2439         BerElementBuffer berbuf;
2440         BerElement *ber = (BerElement *)&berbuf;
2441         ber_int_t mode;
2442         ber_len_t len;
2443         struct berval cookie = BER_BVNULL;
2444         sync_control *sr;
2445         int rhint = 0;
2446
2447         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2448                 rs->sr_text = "Sync control specified multiple times";
2449                 return LDAP_PROTOCOL_ERROR;
2450         }
2451
2452         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2453                 rs->sr_text = "Sync control specified with pagedResults control";
2454                 return LDAP_PROTOCOL_ERROR;
2455         }
2456
2457         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2458                 rs->sr_text = "Sync control value is empty (or absent)";
2459                 return LDAP_PROTOCOL_ERROR;
2460         }
2461
2462         /* Parse the control value
2463          *      syncRequestValue ::= SEQUENCE {
2464          *              mode   ENUMERATED {
2465          *                      -- 0 unused
2466          *                      refreshOnly             (1),
2467          *                      -- 2 reserved
2468          *                      refreshAndPersist       (3)
2469          *              },
2470          *              cookie  syncCookie OPTIONAL
2471          *      }
2472          */
2473
2474         ber_init2( ber, &ctrl->ldctl_value, 0 );
2475
2476         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2477                 rs->sr_text = "Sync control : mode decoding error";
2478                 return LDAP_PROTOCOL_ERROR;
2479         }
2480
2481         switch( mode ) {
2482         case LDAP_SYNC_REFRESH_ONLY:
2483                 mode = SLAP_SYNC_REFRESH;
2484                 break;
2485         case LDAP_SYNC_REFRESH_AND_PERSIST:
2486                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2487                 break;
2488         default:
2489                 rs->sr_text = "Sync control : unknown update mode";
2490                 return LDAP_PROTOCOL_ERROR;
2491         }
2492
2493         tag = ber_peek_tag( ber, &len );
2494
2495         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2496                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2497                         rs->sr_text = "Sync control : cookie decoding error";
2498                         return LDAP_PROTOCOL_ERROR;
2499                 }
2500                 tag = ber_peek_tag( ber, &len );
2501         }
2502         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2503                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2504                         rs->sr_text = "Sync control : rhint decoding error";
2505                         return LDAP_PROTOCOL_ERROR;
2506                 }
2507         }
2508         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2509                         rs->sr_text = "Sync control : decoding error";
2510                         return LDAP_PROTOCOL_ERROR;
2511         }
2512         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2513         sr->sr_rhint = rhint;
2514         if (!BER_BVISNULL(&cookie)) {
2515                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2516                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2517                 if ( sr->sr_state.rid == -1 ) {
2518                         rs->sr_text = "Sync control : cookie parsing error";
2519                         return LDAP_PROTOCOL_ERROR;
2520                 }
2521         }
2522
2523         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2524
2525         op->o_sync = ctrl->ldctl_iscritical
2526                 ? SLAP_CONTROL_CRITICAL
2527                 : SLAP_CONTROL_NONCRITICAL;
2528
2529         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2530
2531         return LDAP_SUCCESS;
2532 }
2533
2534 /* This overlay is set up for dynamic loading via moduleload. For static
2535  * configuration, you'll need to arrange for the slap_overinst to be
2536  * initialized and registered by some other function inside slapd.
2537  */
2538
2539 static slap_overinst            syncprov;
2540
2541 int
2542 syncprov_initialize()
2543 {
2544         int rc;
2545
2546         rc = register_supported_control( LDAP_CONTROL_SYNC,
2547                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2548                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2549         if ( rc != LDAP_SUCCESS ) {
2550                 Debug( LDAP_DEBUG_ANY,
2551                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2552                 return rc;
2553         }
2554
2555         syncprov.on_bi.bi_type = "syncprov";
2556         syncprov.on_bi.bi_db_init = syncprov_db_init;
2557         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2558         syncprov.on_bi.bi_db_open = syncprov_db_open;
2559         syncprov.on_bi.bi_db_close = syncprov_db_close;
2560
2561         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2562         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2563
2564         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2565         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2566         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2567         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2568         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2569         syncprov.on_bi.bi_op_search = syncprov_op_search;
2570         syncprov.on_bi.bi_extended = syncprov_op_extended;
2571         syncprov.on_bi.bi_operational = syncprov_operational;
2572
2573         syncprov.on_bi.bi_cf_ocs = spocs;
2574
2575         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2576
2577         rc = config_register_schema( spcfg, spocs );
2578         if ( rc ) return rc;
2579
2580         return overlay_register( &syncprov );
2581 }
2582
2583 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2584 int
2585 init_module( int argc, char *argv[] )
2586 {
2587         return syncprov_initialize();
2588 }
2589 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2590
2591 #endif /* defined(SLAPD_OVER_SYNCPROV) */