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 2004-2009 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 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74 #define PS_TASK_QUEUED          0x20
  75
  76         int             s_inuse;        /* reference count */
  77         struct syncres *s_res;
  78         struct syncres *s_restail;
  79         ldap_pvt_thread_mutex_t s_mutex;
  80 } syncops;
  81
  82 /* A received sync control */
  83 typedef struct sync_control {
  84         struct sync_cookie sr_state;
  85         int sr_rhint;
  86 } sync_control;
  87
  88 #if 0 /* moved back to slap.h */
  89 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  90 #endif
  91 /* o_sync_mode uses data bits of o_sync */
  92 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  93
  94 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  95 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  98
  99 /* Record of which searches matched at premodify step */
 100 typedef struct syncmatches {
 101         struct syncmatches *sm_next;
 102         syncops *sm_op;
 103 } syncmatches;
 104
 105 /* Session log data */
 106 typedef struct slog_entry {
 107         struct slog_entry *se_next;
 108         struct berval se_uuid;
 109         struct berval se_csn;
 110         int     se_sid;
 111         ber_tag_t       se_tag;
 112 } slog_entry;
 113
 114 typedef struct sessionlog {
 115         struct berval   sl_mincsn;
 116         int             sl_num;
 117         int             sl_size;
 118         slog_entry *sl_head;
 119         slog_entry *sl_tail;
 120         ldap_pvt_thread_mutex_t sl_mutex;
 121 } sessionlog;
 122
 123 /* The main state for this overlay */
 124 typedef struct syncprov_info_t {
 125         syncops         *si_ops;
 126         BerVarray       si_ctxcsn;      /* ldapsync context */
 127         int             *si_sids;
 128         int             si_numcsns;
 129         int             si_chkops;      /* checkpointing info */
 130         int             si_chktime;
 131         int             si_numops;      /* number of ops since last checkpoint */
 132         int             si_nopres;      /* Skip present phase */
 133         int             si_usehint;     /* use reload hint */
 134         time_t  si_chklast;     /* time of last checkpoint */
 135         Avlnode *si_mods;       /* entries being modified */
 136         sessionlog      *si_logs;
 137         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 138         ldap_pvt_thread_mutex_t si_ops_mutex;
 139         ldap_pvt_thread_mutex_t si_mods_mutex;
 140 } syncprov_info_t;
 141
 142 typedef struct opcookie {
 143         slap_overinst *son;
 144         syncmatches *smatches;
 145         modtarget *smt;
 146         struct berval sdn;      /* DN of entry, for deletes */
 147         struct berval sndn;
 148         struct berval suuid;    /* UUID of entry */
 149         struct berval sctxcsn;
 150         short osid;     /* sid of op csn */
 151         short rsid;     /* sid of relay */
 152         short sreference;       /* Is the entry a reference? */
 153 } opcookie;
 154
 155 typedef struct fbase_cookie {
 156         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 157         syncops *fss;   /* persistent search we're testing against */
 158         int fbase;      /* if TRUE we found the search base and it's still valid */
 159         int fscope;     /* if TRUE then fdn is within the psearch scope */
 160 } fbase_cookie;
 161
 162 static AttributeName csn_anlist[3];
 163 static AttributeName uuid_anlist[2];
 164
 165 /* Build a LDAPsync intermediate state control */
 166 static int
 167 syncprov_state_ctrl(
 168         Operation       *op,
 169         SlapReply       *rs,
 170         Entry           *e,
 171         int             entry_sync_state,
 172         LDAPControl     **ctrls,
 173         int             num_ctrls,
 174         int             send_cookie,
 175         struct berval   *cookie )
 176 {
 177         Attribute* a;
 178         int ret;
 179
 180         BerElementBuffer berbuf;
 181         BerElement *ber = (BerElement *)&berbuf;
 182
 183         struct berval   entryuuid_bv = BER_BVNULL;
 184
 185         ber_init2( ber, 0, LBER_USE_DER );
 186         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 187
 188         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 189
 190         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 191                 AttributeDescription *desc = a->a_desc;
 192                 if ( desc == slap_schema.si_ad_entryUUID ) {
 193                         entryuuid_bv = a->a_nvals[0];
 194                         break;
 195                 }
 196         }
 197
 198         /* FIXME: what if entryuuid is NULL or empty ? */
 199
 200         if ( send_cookie && cookie ) {
 201                 ber_printf( ber, "{eOON}",
 202                         entry_sync_state, &entryuuid_bv, cookie );
 203         } else {
 204                 ber_printf( ber, "{eON}",
 205                         entry_sync_state, &entryuuid_bv );
 206         }
 207
 208         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 209         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 210         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 211
 212         ber_free_buf( ber );
 213
 214         if ( ret < 0 ) {
 215                 Debug( LDAP_DEBUG_TRACE,
 216                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 217                         0, 0, 0 );
 218                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 219                 return ret;
 220         }
 221
 222         return LDAP_SUCCESS;
 223 }
 224
 225 /* Build a LDAPsync final state control */
 226 static int
 227 syncprov_done_ctrl(
 228         Operation       *op,
 229         SlapReply       *rs,
 230         LDAPControl     **ctrls,
 231         int                     num_ctrls,
 232         int                     send_cookie,
 233         struct berval *cookie,
 234         int                     refreshDeletes )
 235 {
 236         int ret;
 237         BerElementBuffer berbuf;
 238         BerElement *ber = (BerElement *)&berbuf;
 239
 240         ber_init2( ber, NULL, LBER_USE_DER );
 241         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 242
 243         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 244
 245         ber_printf( ber, "{" );
 246         if ( send_cookie && cookie ) {
 247                 ber_printf( ber, "O", cookie );
 248         }
 249         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 250                 ber_printf( ber, "b", refreshDeletes );
 251         }
 252         ber_printf( ber, "N}" );
 253
 254         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 255         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 256         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 257
 258         ber_free_buf( ber );
 259
 260         if ( ret < 0 ) {
 261                 Debug( LDAP_DEBUG_TRACE,
 262                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 263                         0, 0, 0 );
 264                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 265                 return ret;
 266         }
 267
 268         return LDAP_SUCCESS;
 269 }
 270
 271 static int
 272 syncprov_sendinfo(
 273         Operation       *op,
 274         SlapReply       *rs,
 275         int                     type,
 276         struct berval *cookie,
 277         int                     refreshDone,
 278         BerVarray       syncUUIDs,
 279         int                     refreshDeletes )
 280 {
 281         BerElementBuffer berbuf;
 282         BerElement *ber = (BerElement *)&berbuf;
 283         struct berval rspdata;
 284
 285         int ret;
 286
 287         ber_init2( ber, NULL, LBER_USE_DER );
 288         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 289
 290         if ( type ) {
 291                 switch ( type ) {
 292                 case LDAP_TAG_SYNC_NEW_COOKIE:
 293                         ber_printf( ber, "tO", type, cookie );
 294                         break;
 295                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 296                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDone == 0 ) {
 302                                 ber_printf( ber, "b", refreshDone );
 303                         }
 304                         ber_printf( ber, "N}" );
 305                         break;
 306                 case LDAP_TAG_SYNC_ID_SET:
 307                         ber_printf( ber, "t{", type );
 308                         if ( cookie ) {
 309                                 ber_printf( ber, "O", cookie );
 310                         }
 311                         if ( refreshDeletes == 1 ) {
 312                                 ber_printf( ber, "b", refreshDeletes );
 313                         }
 314                         ber_printf( ber, "[W]", syncUUIDs );
 315                         ber_printf( ber, "N}" );
 316                         break;
 317                 default:
 318                         Debug( LDAP_DEBUG_TRACE,
 319                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 320                                 type, 0, 0 );
 321                         return LDAP_OTHER;
 322                 }
 323         }
 324
 325         ret = ber_flatten2( ber, &rspdata, 0 );
 326
 327         if ( ret < 0 ) {
 328                 Debug( LDAP_DEBUG_TRACE,
 329                         "syncprov_sendinfo: ber_flatten2 failed\n",
 330                         0, 0, 0 );
 331                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 332                 return ret;
 333         }
 334
 335         rs->sr_rspoid = LDAP_SYNC_INFO;
 336         rs->sr_rspdata = &rspdata;
 337         send_ldap_intermediate( op, rs );
 338         rs->sr_rspdata = NULL;
 339         ber_free_buf( ber );
 340
 341         return LDAP_SUCCESS;
 342 }
 343
 344 /* Find a modtarget in an AVL tree */
 345 static int
 346 sp_avl_cmp( const void *c1, const void *c2 )
 347 {
 348         const modtarget *m1, *m2;
 349         int rc;
 350
 351         m1 = c1; m2 = c2;
 352         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 353
 354         if ( rc ) return rc;
 355         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 356 }
 357
 358 /* syncprov_findbase:
 359  *   finds the true DN of the base of a search (with alias dereferencing) and
 360  * checks to make sure the base entry doesn't get replaced with a different
 361  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 362  * change is detected, any persistent search on this base must be terminated /
 363  * reloaded.
 364  *   On the first call, we just save the DN and entryID. On subsequent calls
 365  * we compare the DN and entryID with the saved values.
 366  */
 367 static int
 368 findbase_cb( Operation *op, SlapReply *rs )
 369 {
 370         slap_callback *sc = op->o_callback;
 371
 372         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 373                 fbase_cookie *fc = sc->sc_private;
 374
 375                 /* If no entryID, we're looking for the first time.
 376                  * Just store whatever we got.
 377                  */
 378                 if ( fc->fss->s_eid == NOID ) {
 379                         fc->fbase = 2;
 380                         fc->fss->s_eid = rs->sr_entry->e_id;
 381                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 382
 383                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 384                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 385
 386                 /* OK, the DN is the same and the entryID is the same. */
 387                         fc->fbase = 1;
 388                 }
 389         }
 390         if ( rs->sr_err != LDAP_SUCCESS ) {
 391                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 392         }
 393         return LDAP_SUCCESS;
 394 }
 395
 396 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 397 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 398
 399 static int
 400 syncprov_findbase( Operation *op, fbase_cookie *fc )
 401 {
 402         /* Use basic parameters from syncrepl search, but use
 403          * current op's threadctx / tmpmemctx
 404          */
 405         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 406         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 407                 slap_callback cb = {0};
 408                 Operation fop;
 409                 SlapReply frs = { REP_RESULT };
 410                 int rc;
 411
 412                 fc->fss->s_flags ^= PS_FIND_BASE;
 413                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 414
 415                 fop = *fc->fss->s_op;
 416
 417                 fop.o_bd = fop.o_bd->bd_self;
 418                 fop.o_hdr = op->o_hdr;
 419                 fop.o_time = op->o_time;
 420                 fop.o_tincr = op->o_tincr;
 421
 422                 cb.sc_response = findbase_cb;
 423                 cb.sc_private = fc;
 424
 425                 fop.o_sync_mode = 0;    /* turn off sync mode */
 426                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 427                 fop.o_callback = &cb;
 428                 fop.o_tag = LDAP_REQ_SEARCH;
 429                 fop.ors_scope = LDAP_SCOPE_BASE;
 430                 fop.ors_limit = NULL;
 431                 fop.ors_slimit = 1;
 432                 fop.ors_tlimit = SLAP_NO_LIMIT;
 433                 fop.ors_attrs = slap_anlist_no_attrs;
 434                 fop.ors_attrsonly = 1;
 435                 fop.ors_filter = &generic_filter;
 436                 fop.ors_filterstr = generic_filterstr;
 437
 438                 rc = fop.o_bd->be_search( &fop, &frs );
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 504                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 505                         maxcsn->bv_len = a->a_vals[0].bv_len;
 506                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 507                 }
 508         }
 509         return LDAP_SUCCESS;
 510 }
 511
 512 static int
 513 findcsn_cb( Operation *op, SlapReply *rs )
 514 {
 515         slap_callback *sc = op->o_callback;
 516
 517         /* We just want to know that at least one exists, so it's OK if
 518          * we exceed the unchecked limit.
 519          */
 520         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 521                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 522                 sc->sc_private = (void *)1;
 523         }
 524         return LDAP_SUCCESS;
 525 }
 526
 527 /* Build a list of entryUUIDs for sending in a SyncID set */
 528
 529 #define UUID_LEN        16
 530
 531 typedef struct fpres_cookie {
 532         int num;
 533         BerVarray uuids;
 534         char *last;
 535 } fpres_cookie;
 536
 537 static int
 538 findpres_cb( Operation *op, SlapReply *rs )
 539 {
 540         slap_callback *sc = op->o_callback;
 541         fpres_cookie *pc = sc->sc_private;
 542         Attribute *a;
 543         int ret = SLAP_CB_CONTINUE;
 544
 545         switch ( rs->sr_type ) {
 546         case REP_SEARCH:
 547                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 548                 if ( a ) {
 549                         pc->uuids[pc->num].bv_val = pc->last;
 550                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 551                                 pc->uuids[pc->num].bv_len );
 552                         pc->num++;
 553                         pc->last = pc->uuids[pc->num].bv_val;
 554                         pc->uuids[pc->num].bv_val = NULL;
 555                 }
 556                 ret = LDAP_SUCCESS;
 557                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 558                         break;
 559                 /* FALLTHRU */
 560         case REP_RESULT:
 561                 ret = rs->sr_err;
 562                 if ( pc->num ) {
 563                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 564                                 0, pc->uuids, 0 );
 565                         pc->uuids[pc->num].bv_val = pc->last;
 566                         pc->num = 0;
 567                         pc->last = pc->uuids[0].bv_val;
 568                 }
 569                 break;
 570         default:
 571                 break;
 572         }
 573         return ret;
 574 }
 575
 576 static int
 577 syncprov_findcsn( Operation *op, find_csn_t mode )
 578 {
 579         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 580         syncprov_info_t         *si = on->on_bi.bi_private;
 581
 582         slap_callback cb = {0};
 583         Operation fop;
 584         SlapReply frs = { REP_RESULT };
 585         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 586         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 587         struct berval maxcsn;
 588         Filter cf;
 589         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 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         int maxid;
 595
 596         if ( mode != FIND_MAXCSN ) {
 597                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 598         }
 599
 600         fop = *op;
 601         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 602         /* We want pure entries, not referrals */
 603         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 604
 605         cf.f_ava = &eq;
 606         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 607         BER_BVZERO( &cf.f_av_value );
 608         cf.f_next = NULL;
 609
 610         fop.o_callback = &cb;
 611         fop.ors_limit = NULL;
 612         fop.ors_tlimit = SLAP_NO_LIMIT;
 613         fop.ors_filter = &cf;
 614         fop.ors_filterstr.bv_val = buf;
 615
 616 again:
 617         switch( mode ) {
 618         case FIND_MAXCSN:
 619                 cf.f_choice = LDAP_FILTER_GE;
 620                 /* If there are multiple CSNs, use the one with our serverID */
 621                 for ( i=0; i<si->si_numcsns; i++) {
 622                         if ( slap_serverID == si->si_sids[i] ) {
 623                                 maxid = i;
 624                                 break;
 625                         }
 626                 }
 627                 if ( i == si->si_numcsns ) {
 628                         /* No match: this is multimaster, and none of the content in the DB
 629                          * originated locally. Treat like no CSN.
 630                          */
 631                         return LDAP_NO_SUCH_OBJECT;
 632                 }
 633                 cf.f_av_value = si->si_ctxcsn[maxid];
 634                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 635                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 636                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 637                         return LDAP_OTHER;
 638                 }
 639                 fop.ors_attrsonly = 0;
 640                 fop.ors_attrs = csn_anlist;
 641                 fop.ors_slimit = SLAP_NO_LIMIT;
 642                 cb.sc_private = &maxcsn;
 643                 cb.sc_response = findmax_cb;
 644                 strcpy( cbuf, cf.f_av_value.bv_val );
 645                 maxcsn.bv_val = cbuf;
 646                 maxcsn.bv_len = cf.f_av_value.bv_len;
 647                 break;
 648         case FIND_CSN:
 649                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 650                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 651                         /* If there are multiple CSNs, use the smallest */
 652                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 653                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 654                                         > 0 ) {
 655                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 656                                 }
 657                         }
 658                 }
 659                 /* Look for exact match the first time */
 660                 if ( findcsn_retry ) {
 661                         cf.f_choice = LDAP_FILTER_EQUALITY;
 662                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 663                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 664                 /* On retry, look for <= */
 665                 } else {
 666                         cf.f_choice = LDAP_FILTER_LE;
 667                         fop.ors_limit = &fc_limits;
 668                         memset( &fc_limits, 0, sizeof( fc_limits ));
 669                         fc_limits.lms_s_unchecked = 1;
 670                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 671                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 672                 }
 673                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 674                         return LDAP_OTHER;
 675                 }
 676                 fop.ors_attrsonly = 1;
 677                 fop.ors_attrs = slap_anlist_no_attrs;
 678                 fop.ors_slimit = 1;
 679                 cb.sc_private = NULL;
 680                 cb.sc_response = findcsn_cb;
 681                 break;
 682         case FIND_PRESENT:
 683                 fop.ors_filter = op->ors_filter;
 684                 fop.ors_filterstr = op->ors_filterstr;
 685                 fop.ors_attrsonly = 0;
 686                 fop.ors_attrs = uuid_anlist;
 687                 fop.ors_slimit = SLAP_NO_LIMIT;
 688                 cb.sc_private = &pcookie;
 689                 cb.sc_response = findpres_cb;
 690                 pcookie.num = 0;
 691
 692                 /* preallocate storage for a full set */
 693                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 694                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 695                         op->o_tmpmemctx );
 696                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 697                 pcookie.uuids[0].bv_val = pcookie.last;
 698                 pcookie.uuids[0].bv_len = UUID_LEN;
 699                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 700                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 701                         pcookie.uuids[i].bv_len = UUID_LEN;
 702                 }
 703                 break;
 704         }
 705
 706         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 707         fop.o_bd->be_search( &fop, &frs );
 708         fop.o_bd->bd_info = (BackendInfo *)on;
 709
 710         switch( mode ) {
 711         case FIND_MAXCSN:
 712                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 713 #ifdef CHECK_CSN
 714                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 715                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 716 #endif
 717                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 718                         si->si_numops++;        /* ensure a checkpoint */
 719                 }
 720                 break;
 721         case FIND_CSN:
 722                 /* If matching CSN was not found, invalidate the context. */
 723                 if ( !cb.sc_private ) {
 724                         /* If we didn't find an exact match, then try for <= */
 725                         if ( findcsn_retry ) {
 726                                 findcsn_retry = 0;
 727                                 goto again;
 728                         }
 729                         rc = LDAP_NO_SUCH_OBJECT;
 730                 }
 731                 break;
 732         case FIND_PRESENT:
 733                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 734                 break;
 735         }
 736
 737         return rc;
 738 }
 739
 740 static void
 741 syncprov_free_syncop( syncops *so )
 742 {
 743         syncres *sr, *srnext;
 744         GroupAssertion *ga, *gnext;
 745
 746         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 747         if ( --so->s_inuse > 0 ) {
 748                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 749                 return;
 750         }
 751         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 752         if ( so->s_flags & PS_IS_DETACHED ) {
 753                 filter_free( so->s_op->ors_filter );
 754                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 755                         gnext = ga->ga_next;
 756                         ch_free( ga );
 757                 }
 758                 ch_free( so->s_op );
 759         }
 760         ch_free( so->s_base.bv_val );
 761         for ( sr=so->s_res; sr; sr=srnext ) {
 762                 srnext = sr->s_next;
 763                 ch_free( sr );
 764         }
 765         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 766         ch_free( so );
 767 }
 768
 769 /* Send a persistent search response */
 770 static int
 771 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 772         Entry **e, int mode )
 773 {
 774         slap_overinst *on = opc->son;
 775
 776         SlapReply rs = { REP_SEARCH };
 777         LDAPControl *ctrls[2];
 778         struct berval cookie, csns[2];
 779         Entry e_uuid = {0};
 780         Attribute a_uuid = {0};
 781
 782         if ( so->s_op->o_abandon )
 783                 return SLAPD_ABANDON;
 784
 785         ctrls[1] = NULL;
 786         csns[0] = opc->sctxcsn;
 787         BER_BVZERO( &csns[1] );
 788         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 789
 790 #ifdef LDAP_DEBUG
 791         if ( so->s_sid > 0 ) {
 792                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 793                         so->s_sid, cookie.bv_val, 0 );
 794         } else {
 795                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 796                         cookie.bv_val, 0, 0 );
 797         }
 798 #endif
 799
 800         e_uuid.e_attrs = &a_uuid;
 801         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 802         a_uuid.a_nvals = &opc->suuid;
 803         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 804                 mode, ctrls, 0, 1, &cookie );
 805         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 806
 807         rs.sr_ctrls = ctrls;
 808         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 809         switch( mode ) {
 810         case LDAP_SYNC_ADD:
 811                 rs.sr_entry = *e;
 812                 if ( rs.sr_entry->e_private )
 813                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 814                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 815                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 816                         rs.sr_err = send_search_reference( op, &rs );
 817                         ber_bvarray_free( rs.sr_ref );
 818                         if ( !rs.sr_entry )
 819                                 *e = NULL;
 820                         break;
 821                 }
 822                 /* fallthru */
 823         case LDAP_SYNC_MODIFY:
 824                 rs.sr_entry = *e;
 825                 if ( rs.sr_entry->e_private )
 826                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 827                 rs.sr_attrs = op->ors_attrs;
 828                 rs.sr_err = send_search_entry( op, &rs );
 829                 if ( !rs.sr_entry )
 830                         *e = NULL;
 831                 break;
 832         case LDAP_SYNC_DELETE:
 833                 e_uuid.e_attrs = NULL;
 834                 e_uuid.e_name = opc->sdn;
 835                 e_uuid.e_nname = opc->sndn;
 836                 rs.sr_entry = &e_uuid;
 837                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 838                         struct berval bv = BER_BVNULL;
 839                         rs.sr_ref = &bv;
 840                         rs.sr_err = send_search_reference( op, &rs );
 841                 } else {
 842                         rs.sr_err = send_search_entry( op, &rs );
 843                 }
 844                 break;
 845         default:
 846                 assert(0);
 847         }
 848         /* In case someone else freed it already? */
 849         if ( rs.sr_ctrls ) {
 850                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 851                 rs.sr_ctrls = NULL;
 852         }
 853
 854         return rs.sr_err;
 855 }
 856
 857 static void
 858 syncprov_qstart( syncops *so );
 859
 860 /* Play back queued responses */
 861 static int
 862 syncprov_qplay( Operation *op, syncops *so )
 863 {
 864         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 865         syncres *sr;
 866         Entry *e;
 867         opcookie opc;
 868         int rc = 0;
 869
 870         opc.son = on;
 871
 872         do {
 873                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 874                 sr = so->s_res;
 875                 if ( sr )
 876                         so->s_res = sr->s_next;
 877                 if ( !so->s_res )
 878                         so->s_restail = NULL;
 879                 /* Exit loop with mutex held */
 880                 if ( !sr || so->s_op->o_abandon )
 881                         break;
 882                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 883
 884                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 885                     SlapReply rs = { REP_INTERMEDIATE };
 886
 887                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 888                                 &sr->s_csn, 0, NULL, 0 );
 889                 } else {
 890                         opc.sdn = sr->s_dn;
 891                         opc.sndn = sr->s_ndn;
 892                         opc.suuid = sr->s_uuid;
 893                         opc.sctxcsn = sr->s_csn;
 894                         opc.sreference = sr->s_isreference;
 895                         e = NULL;
 896
 897                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 898                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 899                                 if ( rc ) {
 900                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 901                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 902                                         ch_free( sr );
 903                                         rc = 0;
 904                                         continue;
 905                                 }
 906                         }
 907                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 908
 909                         if ( e ) {
 910                                 overlay_entry_release_ov( op, e, 0, on );
 911                         }
 912                 }
 913
 914                 ch_free( sr );
 915
 916                 /* Exit loop with mutex held */
 917                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 918
 919         } while (0);
 920
 921         /* We now only send one change at a time, to prevent one
 922          * psearch from hogging all the CPU. Resubmit this task if
 923          * there are more responses queued and no errors occurred.
 924          */
 925
 926         if ( rc == 0 && so->s_res ) {
 927                 syncprov_qstart( so );
 928         } else {
 929                 so->s_flags ^= PS_TASK_QUEUED;
 930         }
 931
 932         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 933         return rc;
 934 }
 935
 936 /* task for playing back queued responses */
 937 static void *
 938 syncprov_qtask( void *ctx, void *arg )
 939 {
 940         syncops *so = arg;
 941         OperationBuffer opbuf;
 942         Operation *op;
 943         BackendDB be;
 944         int rc;
 945
 946         op = &opbuf.ob_op;
 947         *op = *so->s_op;
 948         op->o_hdr = &opbuf.ob_hdr;
 949         op->o_controls = opbuf.ob_controls;
 950         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 951
 952         *op->o_hdr = *so->s_op->o_hdr;
 953
 954         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 955         op->o_tmpmfuncs = &slap_sl_mfuncs;
 956         op->o_threadctx = ctx;
 957
 958         /* syncprov_qplay expects a fake db */
 959         be = *so->s_op->o_bd;
 960         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 961         op->o_bd = &be;
 962         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 963         op->o_callback = NULL;
 964
 965         rc = syncprov_qplay( op, so );
 966
 967         /* decrement use count... */
 968         syncprov_free_syncop( so );
 969
 970         return NULL;
 971 }
 972
 973 /* Start the task to play back queued psearch responses */
 974 static void
 975 syncprov_qstart( syncops *so )
 976 {
 977         so->s_flags |= PS_TASK_QUEUED;
 978         so->s_inuse++;
 979         ldap_pvt_thread_pool_submit( &connection_pool,
 980                 syncprov_qtask, so );
 981 }
 982
 983 /* Queue a persistent search response */
 984 static int
 985 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 986 {
 987         syncres *sr;
 988         int srsize;
 989         struct berval cookie = opc->sctxcsn;
 990
 991         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
 992                 syncprov_info_t *si = opc->son->on_bi.bi_private;
 993
 994                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
 995                         so->s_rid, slap_serverID ? slap_serverID : -1);
 996         }
 997
 998         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
 999                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1000         if ( cookie.bv_len )
1001                 srsize += cookie.bv_len + 1;
1002         sr = ch_malloc( srsize );
1003         sr->s_next = NULL;
1004         sr->s_dn.bv_val = (char *)(sr + 1);
1005         sr->s_dn.bv_len = opc->sdn.bv_len;
1006         sr->s_mode = mode;
1007         sr->s_isreference = opc->sreference;
1008         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1009                  opc->sdn.bv_val ) + 1;
1010         sr->s_ndn.bv_len = opc->sndn.bv_len;
1011         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1012                  opc->sndn.bv_val ) + 1;
1013         sr->s_uuid.bv_len = opc->suuid.bv_len;
1014         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1015         if ( cookie.bv_len ) {
1016                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1017                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1018         } else {
1019                 sr->s_csn.bv_val = NULL;
1020         }
1021         sr->s_csn.bv_len = cookie.bv_len;
1022
1023         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1024                 ch_free( cookie.bv_val );
1025         }
1026
1027         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1028         if ( !so->s_res ) {
1029                 so->s_res = sr;
1030         } else {
1031                 so->s_restail->s_next = sr;
1032         }
1033         so->s_restail = sr;
1034
1035         /* If the base of the psearch was modified, check it next time round */
1036         if ( so->s_flags & PS_WROTE_BASE ) {
1037                 so->s_flags ^= PS_WROTE_BASE;
1038                 so->s_flags |= PS_FIND_BASE;
1039         }
1040         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1041                 syncprov_qstart( so );
1042         }
1043         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1044         return LDAP_SUCCESS;
1045 }
1046
1047 static int
1048 syncprov_drop_psearch( syncops *so, int lock )
1049 {
1050         if ( so->s_flags & PS_IS_DETACHED ) {
1051                 if ( lock )
1052                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1053                 so->s_op->o_conn->c_n_ops_executing--;
1054                 so->s_op->o_conn->c_n_ops_completed++;
1055                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1056                         o_next );
1057                 if ( lock )
1058                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1059         }
1060         syncprov_free_syncop( so );
1061
1062         return 0;
1063 }
1064
1065 static int
1066 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1067 {
1068         slap_callback *sc = op->o_callback;
1069         op->o_callback = sc->sc_next;
1070         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1071         op->o_tmpfree( sc, op->o_tmpmemctx );
1072         return 0;
1073 }
1074
1075 static int
1076 syncprov_op_abandon( Operation *op, SlapReply *rs )
1077 {
1078         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1079         syncprov_info_t         *si = on->on_bi.bi_private;
1080         syncops *so, *soprev;
1081
1082         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1083         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1084                 soprev=so, so=so->s_next ) {
1085                 if ( so->s_op->o_connid == op->o_connid &&
1086                         so->s_op->o_msgid == op->orn_msgid ) {
1087                                 so->s_op->o_abandon = 1;
1088                                 soprev->s_next = so->s_next;
1089                                 break;
1090                 }
1091         }
1092         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1093         if ( so ) {
1094                 /* Is this really a Cancel exop? */
1095                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1096                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1097                         rs->sr_err = LDAP_CANCELLED;
1098                         send_ldap_result( so->s_op, rs );
1099                         if ( so->s_flags & PS_IS_DETACHED ) {
1100                                 slap_callback *cb;
1101                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1102                                 cb->sc_cleanup = syncprov_ab_cleanup;
1103                                 cb->sc_next = op->o_callback;
1104                                 cb->sc_private = so;
1105                                 return SLAP_CB_CONTINUE;
1106                         }
1107                 }
1108                 syncprov_drop_psearch( so, 0 );
1109         }
1110         return SLAP_CB_CONTINUE;
1111 }
1112
1113 /* Find which persistent searches are affected by this operation */
1114 static void
1115 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1116 {
1117         slap_overinst *on = opc->son;
1118         syncprov_info_t         *si = on->on_bi.bi_private;
1119
1120         fbase_cookie fc;
1121         syncops *ss, *sprev, *snext;
1122         Entry *e = NULL;
1123         Attribute *a;
1124         int rc;
1125         struct berval newdn;
1126         int freefdn = 0;
1127         BackendDB *b0 = op->o_bd, db;
1128
1129         fc.fdn = &op->o_req_ndn;
1130         /* compute new DN */
1131         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1132                 struct berval pdn;
1133                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1134                 else dnParent( fc.fdn, &pdn );
1135                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1136                 fc.fdn = &newdn;
1137                 freefdn = 1;
1138         }
1139         if ( op->o_tag != LDAP_REQ_ADD ) {
1140                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1141                         db = *op->o_bd;
1142                         op->o_bd = &db;
1143                 }
1144                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1145                 /* If we're sending responses now, make a copy and unlock the DB */
1146                 if ( e && !saveit ) {
1147                         Entry *e2 = entry_dup( e );
1148                         overlay_entry_release_ov( op, e, 0, on );
1149                         e = e2;
1150                 }
1151                 if ( rc ) {
1152                         op->o_bd = b0;
1153                         return;
1154                 }
1155         } else {
1156                 e = op->ora_e;
1157         }
1158
1159         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1160                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1161                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1162                 opc->sreference = is_entry_referral( e );
1163                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1164                 if ( a )
1165                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1166         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1167                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1168                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1169                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1170                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1171         }
1172
1173         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1174         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1175                 sprev = ss, ss=snext)
1176         {
1177                 Operation op2;
1178                 Opheader oh;
1179                 syncmatches *sm;
1180                 int found = 0;
1181
1182                 snext = ss->s_next;
1183                 if ( ss->s_op->o_abandon )
1184                         continue;
1185
1186                 /* First time thru, check for possible skips */
1187                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1188
1189                         /* Don't send ops back to the originator */
1190                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1191                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1192                                         opc->osid, 0, 0 );
1193                                 continue;
1194                         }
1195
1196                         /* Don't send ops back to the messenger */
1197                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1198                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1199                                         opc->rsid, 0, 0 );
1200                                 continue;
1201                         }
1202                 }
1203
1204                 /* validate base */
1205                 fc.fss = ss;
1206                 fc.fbase = 0;
1207                 fc.fscope = 0;
1208
1209                 /* If the base of the search is missing, signal a refresh */
1210                 rc = syncprov_findbase( op, &fc );
1211                 if ( rc != LDAP_SUCCESS ) {
1212                         SlapReply rs = {REP_RESULT};
1213                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1214                                 "search base has changed" );
1215                         sprev->s_next = snext;
1216                         syncprov_drop_psearch( ss, 1 );
1217                         ss = sprev;
1218                         continue;
1219                 }
1220
1221
1222                 /* If we're sending results now, look for this op in old matches */
1223                 if ( !saveit ) {
1224                         syncmatches *old;
1225
1226                         /* Did we modify the search base? */
1227                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1228                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1229                                 ss->s_flags |= PS_WROTE_BASE;
1230                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1231                         }
1232
1233                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1234                                 old=sm, sm=sm->sm_next ) {
1235                                 if ( sm->sm_op == ss ) {
1236                                         found = 1;
1237                                         old->sm_next = sm->sm_next;
1238                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1239                                         break;
1240                                 }
1241                         }
1242                 }
1243
1244                 if ( fc.fscope ) {
1245                         op2 = *ss->s_op;
1246                         oh = *op->o_hdr;
1247                         oh.oh_conn = ss->s_op->o_conn;
1248                         oh.oh_connid = ss->s_op->o_connid;
1249                         op2.o_hdr = &oh;
1250                         op2.o_extra = op->o_extra;
1251                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1252                 }
1253
1254                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1255                         ss->s_sid, fc.fscope, rc );
1256
1257                 /* check if current o_req_dn is in scope and matches filter */
1258                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1259                         if ( saveit ) {
1260                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1261                                 sm->sm_next = opc->smatches;
1262                                 sm->sm_op = ss;
1263                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1264                                 ++ss->s_inuse;
1265                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1266                                 opc->smatches = sm;
1267                         } else {
1268                                 /* if found send UPDATE else send ADD */
1269                                 syncprov_qresp( opc, ss,
1270                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1271                         }
1272                 } else if ( !saveit && found ) {
1273                         /* send DELETE */
1274                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1275                 } else if ( !saveit ) {
1276                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1277                 }
1278                 if ( !saveit && found ) {
1279                         /* Decrement s_inuse, was incremented when called
1280                          * with saveit == TRUE
1281                          */
1282                         syncprov_free_syncop( ss );
1283                 }
1284         }
1285         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1286
1287         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1288                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1289                         op->o_bd = &db;
1290                 }
1291                 overlay_entry_release_ov( op, e, 0, on );
1292                 op->o_bd = b0;
1293         }
1294         if ( freefdn ) {
1295                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1296         }
1297         op->o_bd = b0;
1298 }
1299
1300 static int
1301 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1302 {
1303         slap_callback *cb = op->o_callback;
1304         opcookie *opc = cb->sc_private;
1305         slap_overinst *on = opc->son;
1306         syncprov_info_t         *si = on->on_bi.bi_private;
1307         syncmatches *sm, *snext;
1308         modtarget *mt, mtdummy;
1309
1310         for (sm = opc->smatches; sm; sm=snext) {
1311                 snext = sm->sm_next;
1312                 syncprov_free_syncop( sm->sm_op );
1313                 op->o_tmpfree( sm, op->o_tmpmemctx );
1314         }
1315
1316         /* Remove op from lock table */
1317         mt = opc->smt;
1318         if ( mt ) {
1319                 modinst *mi = mt->mt_mods;
1320
1321                 /* If there are more, promote the next one */
1322                 if ( mi->mi_next ) {
1323                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1324                         mt->mt_mods = mi->mi_next;
1325                         mt->mt_op = mt->mt_mods->mi_op;
1326                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1327                 } else {
1328                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1329                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1330                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1331                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1332                         ch_free( mt );
1333                 }
1334         }
1335         if ( !BER_BVISNULL( &opc->suuid ))
1336                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1337         if ( !BER_BVISNULL( &opc->sndn ))
1338                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1339         if ( !BER_BVISNULL( &opc->sdn ))
1340                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1341         op->o_callback = cb->sc_next;
1342         op->o_tmpfree(cb, op->o_tmpmemctx);
1343
1344         return 0;
1345 }
1346
1347 static void
1348 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1349 {
1350         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1351         Modifications mod;
1352         Operation opm;
1353         SlapReply rsm = { 0 };
1354         slap_callback cb = {0};
1355         BackendDB be;
1356 #ifdef CHECK_CSN
1357         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1358
1359         int i;
1360         for ( i=0; i<si->si_numcsns; i++ ) {
1361                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1362         }
1363 #endif
1364         mod.sml_numvals = si->si_numcsns;
1365         mod.sml_values = si->si_ctxcsn;
1366         mod.sml_nvalues = NULL;
1367         mod.sml_desc = slap_schema.si_ad_contextCSN;
1368         mod.sml_op = LDAP_MOD_REPLACE;
1369         mod.sml_flags = SLAP_MOD_INTERNAL;
1370         mod.sml_next = NULL;
1371
1372         cb.sc_response = slap_null_cb;
1373         opm = *op;
1374         opm.o_tag = LDAP_REQ_MODIFY;
1375         opm.o_callback = &cb;
1376         opm.orm_modlist = &mod;
1377         opm.orm_no_opattrs = 1;
1378         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1379                 be = *on->on_info->oi_origdb;
1380                 opm.o_bd = &be;
1381         }
1382         opm.o_req_dn = opm.o_bd->be_suffix[0];
1383         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1384         opm.o_bd->bd_info = on->on_info->oi_orig;
1385         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1386         opm.o_no_schema_check = 1;
1387         opm.o_bd->be_modify( &opm, &rsm );
1388         if ( mod.sml_next != NULL ) {
1389                 slap_mods_free( mod.sml_next, 1 );
1390         }
1391 #ifdef CHECK_CSN
1392         for ( i=0; i<si->si_numcsns; i++ ) {
1393                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1394         }
1395 #endif
1396 }
1397
1398 static void
1399 syncprov_add_slog( Operation *op )
1400 {
1401         opcookie *opc = op->o_callback->sc_private;
1402         slap_overinst *on = opc->son;
1403         syncprov_info_t         *si = on->on_bi.bi_private;
1404         sessionlog *sl;
1405         slog_entry *se;
1406
1407         sl = si->si_logs;
1408         {
1409                 /* Allocate a record. UUIDs are not NUL-terminated. */
1410                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1411                         op->o_csn.bv_len + 1 );
1412                 se->se_next = NULL;
1413                 se->se_tag = op->o_tag;
1414
1415                 se->se_uuid.bv_val = (char *)(&se[1]);
1416                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1417                 se->se_uuid.bv_len = opc->suuid.bv_len;
1418
1419                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1420                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1421                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1422                 se->se_csn.bv_len = op->o_csn.bv_len;
1423                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1424
1425                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1426                 if ( sl->sl_head ) {
1427                         sl->sl_tail->se_next = se;
1428                 } else {
1429                         sl->sl_head = se;
1430                 }
1431                 sl->sl_tail = se;
1432                 sl->sl_num++;
1433                 while ( sl->sl_num > sl->sl_size ) {
1434                         se = sl->sl_head;
1435                         sl->sl_head = se->se_next;
1436                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1437                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1438                         ch_free( se );
1439                         sl->sl_num--;
1440                 }
1441                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1442         }
1443 }
1444
1445 /* Just set a flag if we found the matching entry */
1446 static int
1447 playlog_cb( Operation *op, SlapReply *rs )
1448 {
1449         if ( rs->sr_type == REP_SEARCH ) {
1450                 op->o_callback->sc_private = (void *)1;
1451         }
1452         return rs->sr_err;
1453 }
1454
1455 /* enter with sl->sl_mutex locked, release before returning */
1456 static void
1457 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1458         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1459 {
1460         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1461         slog_entry *se;
1462         int i, j, ndel, num, nmods, mmods;
1463         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1464         BerVarray uuids;
1465         struct berval delcsn[2];
1466
1467         if ( !sl->sl_num ) {
1468                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1469                 return;
1470         }
1471
1472         num = sl->sl_num;
1473         i = 0;
1474         nmods = 0;
1475
1476         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1477                 num * UUID_LEN, op->o_tmpmemctx );
1478         uuids[0].bv_val = (char *)(uuids + num + 1);
1479
1480         delcsn[0].bv_len = 0;
1481         delcsn[0].bv_val = cbuf;
1482         BER_BVZERO(&delcsn[1]);
1483
1484         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1485          * and everything else at the end. Do this first so we can
1486          * unlock the list mutex.
1487          */
1488         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1489                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1490         for ( se=sl->sl_head; se; se=se->se_next ) {
1491                 int k;
1492                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1493                 ndel = 1;
1494                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1495                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1496                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1497                                 break;
1498                         }
1499                 }
1500                 if ( ndel <= 0 ) {
1501                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1502                         continue;
1503                 }
1504                 ndel = 0;
1505                 for ( k=0; k<numcsns; k++ ) {
1506                         if ( se->se_sid == sids[k] ) {
1507                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1508                                 break;
1509                         }
1510                 }
1511                 if ( ndel > 0 ) {
1512                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1513                         break;
1514                 }
1515                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1516                         j = i;
1517                         i++;
1518                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1519                         delcsn[0].bv_len = se->se_csn.bv_len;
1520                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1521                 } else {
1522                         nmods++;
1523                         j = num - nmods;
1524                 }
1525                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1526                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1527                 uuids[j].bv_len = UUID_LEN;
1528         }
1529         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1530
1531         ndel = i;
1532
1533         /* Zero out unused slots */
1534         for ( i=ndel; i < num - nmods; i++ )
1535                 uuids[i].bv_len = 0;
1536
1537         /* Mods must be validated to see if they belong in this delete set.
1538          */
1539
1540         mmods = nmods;
1541         /* Strip any duplicates */
1542         for ( i=0; i<nmods; i++ ) {
1543                 for ( j=0; j<ndel; j++ ) {
1544                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1545                                 uuids[num - 1 - i].bv_len = 0;
1546                                 mmods --;
1547                                 break;
1548                         }
1549                 }
1550                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1551                 for ( j=0; j<i; j++ ) {
1552                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1553                                 uuids[num - 1 - i].bv_len = 0;
1554                                 mmods --;
1555                                 break;
1556                         }
1557                 }
1558         }
1559
1560         if ( mmods ) {
1561                 Operation fop;
1562                 SlapReply frs = { REP_RESULT };
1563                 int rc;
1564                 Filter mf, af;
1565                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1566                 slap_callback cb = {0};
1567
1568                 fop = *op;
1569
1570                 fop.o_sync_mode = 0;
1571                 fop.o_callback = &cb;
1572                 fop.ors_limit = NULL;
1573                 fop.ors_tlimit = SLAP_NO_LIMIT;
1574                 fop.ors_attrs = slap_anlist_all_attributes;
1575                 fop.ors_attrsonly = 0;
1576                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1577
1578                 af.f_choice = LDAP_FILTER_AND;
1579                 af.f_next = NULL;
1580                 af.f_and = &mf;
1581                 mf.f_choice = LDAP_FILTER_EQUALITY;
1582                 mf.f_ava = &eq;
1583                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1584                 mf.f_next = fop.ors_filter;
1585
1586                 fop.ors_filter = &af;
1587
1588                 cb.sc_response = playlog_cb;
1589                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1590
1591                 for ( i=ndel; i<num; i++ ) {
1592                         if ( uuids[i].bv_len == 0 ) continue;
1593
1594                         mf.f_av_value = uuids[i];
1595                         cb.sc_private = NULL;
1596                         fop.ors_slimit = 1;
1597                         frs.sr_nentries = 0;
1598                         rc = fop.o_bd->be_search( &fop, &frs );
1599
1600                         /* If entry was not found, add to delete list */
1601                         if ( !cb.sc_private ) {
1602                                 uuids[ndel++] = uuids[i];
1603                         }
1604                 }
1605                 fop.o_bd->bd_info = (BackendInfo *)on;
1606         }
1607         if ( ndel ) {
1608                 struct berval cookie;
1609
1610                 if ( delcsn[0].bv_len ) {
1611                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1612                                 slap_serverID ? slap_serverID : -1 );
1613
1614                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1615                 }
1616
1617                 uuids[ndel].bv_val = NULL;
1618                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1619                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1620                 if ( delcsn[0].bv_len ) {
1621                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1622                 }
1623         }
1624         op->o_tmpfree( uuids, op->o_tmpmemctx );
1625 }
1626
1627 static int
1628 syncprov_op_response( Operation *op, SlapReply *rs )
1629 {
1630         opcookie *opc = op->o_callback->sc_private;
1631         slap_overinst *on = opc->son;
1632         syncprov_info_t         *si = on->on_bi.bi_private;
1633         syncmatches *sm;
1634
1635         if ( rs->sr_err == LDAP_SUCCESS )
1636         {
1637                 struct berval maxcsn;
1638                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1639                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1640
1641                 /* Update our context CSN */
1642                 cbuf[0] = '\0';
1643                 maxcsn.bv_val = cbuf;
1644                 maxcsn.bv_len = sizeof(cbuf);
1645                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1646
1647 #if 0
1648                 if ( op->o_dont_replicate &&
1649                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1650                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1651                         /* Catch contextCSN updates from syncrepl. We have to look at
1652                          * all the attribute values, as there may be more than one csn
1653                          * that changed, and only one can be passed in the csn queue.
1654                          */
1655                         Modifications *mod = op->orm_modlist;
1656                         int i, j, sid;
1657
1658                         for ( i=0; i<mod->sml_numvals; i++ ) {
1659                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1660
1661                                 for ( j=0; j<si->si_numcsns; j++ ) {
1662                                         if ( sid == si->si_sids[j] ) {
1663                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1664                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1665                                                         csn_changed = 1;
1666                                                 }
1667                                                 break;
1668                                         }
1669                                 }
1670
1671                                 if ( j == si->si_numcsns ) {
1672                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1673                                         si->si_numcsns++;
1674                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1675                                                 sizeof(int));
1676                                         si->si_sids[j] = sid;
1677                                         csn_changed = 1;
1678                                 }
1679                         }
1680                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1681
1682                         if ( csn_changed ) {
1683                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1684                                 have_psearches = ( si->si_ops != NULL );
1685                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1686
1687                                 if ( have_psearches ) {
1688                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1689                                                 if ( sm->sm_op->s_op->o_abandon )
1690                                                         continue;
1691                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1692                                         }
1693                                 }
1694                         }
1695                         return SLAP_CB_CONTINUE;
1696                 }
1697 #endif
1698
1699                 slap_get_commit_csn( op, &maxcsn, &foundit );
1700                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1701                         /* syncrepl queues the CSN values in the db where
1702                          * it is configured , not where the changes are made.
1703                          * So look for a value in the glue db if we didn't
1704                          * find any in this db.
1705                          */
1706                         BackendDB *be = op->o_bd;
1707                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1708                         maxcsn.bv_val = cbuf;
1709                         maxcsn.bv_len = sizeof(cbuf);
1710                         slap_get_commit_csn( op, &maxcsn, &foundit );
1711                         op->o_bd = be;
1712                 }
1713                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1714                         int i, sid;
1715 #ifdef CHECK_CSN
1716                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1717                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1718 #endif
1719                         sid = slap_parse_csn_sid( &maxcsn );
1720                         for ( i=0; i<si->si_numcsns; i++ ) {
1721                                 if ( sid == si->si_sids[i] ) {
1722                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1723                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1724                                                 csn_changed = 1;
1725                                         }
1726                                         break;
1727                                 }
1728                         }
1729                         /* It's a new SID for us */
1730                         if ( i == si->si_numcsns ) {
1731                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1732                                 csn_changed = 1;
1733                                 si->si_numcsns++;
1734                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1735                                         sizeof(int));
1736                                 si->si_sids[i] = sid;
1737                         }
1738                 } else if ( !foundit ) {
1739                         /* internal ops that aren't meant to be replicated */
1740                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1741                         return SLAP_CB_CONTINUE;
1742                 }
1743
1744                 /* Don't do any processing for consumer contextCSN updates */
1745                 if ( op->o_dont_replicate ) {
1746                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1747                         return SLAP_CB_CONTINUE;
1748                 }
1749
1750                 si->si_numops++;
1751                 if ( si->si_chkops || si->si_chktime ) {
1752                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1753                                 do_check = 1;
1754                                 si->si_numops = 0;
1755                         }
1756                         if ( si->si_chktime &&
1757                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1758                                 if ( si->si_chklast ) {
1759                                         do_check = 1;
1760                                         si->si_chklast = op->o_time;
1761                                 } else {
1762                                         si->si_chklast = 1;
1763                                 }
1764                         }
1765                 }
1766                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1767
1768                 if ( do_check ) {
1769                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1770                         syncprov_checkpoint( op, rs, on );
1771                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1772                 }
1773
1774                 /* only update consumer ctx if this is a newer csn */
1775                 if ( csn_changed ) {
1776                         opc->sctxcsn = maxcsn;
1777                 }
1778
1779                 /* Handle any persistent searches */
1780                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1781                 have_psearches = ( si->si_ops != NULL );
1782                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1783                 if ( have_psearches ) {
1784                         switch(op->o_tag) {
1785                         case LDAP_REQ_ADD:
1786                         case LDAP_REQ_MODIFY:
1787                         case LDAP_REQ_MODRDN:
1788                         case LDAP_REQ_EXTENDED:
1789                                 syncprov_matchops( op, opc, 0 );
1790                                 break;
1791                         case LDAP_REQ_DELETE:
1792                                 /* for each match in opc->smatches:
1793                                  *   send DELETE msg
1794                                  */
1795                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1796                                         if ( sm->sm_op->s_op->o_abandon )
1797                                                 continue;
1798                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1799                                 }
1800                                 break;
1801                         }
1802                 }
1803
1804                 /* Add any log records */
1805                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1806                         syncprov_add_slog( op );
1807                 }
1808
1809         }
1810         return SLAP_CB_CONTINUE;
1811 }
1812
1813 /* We don't use a subentry to store the context CSN any more.
1814  * We expose the current context CSN as an operational attribute
1815  * of the suffix entry.
1816  */
1817 static int
1818 syncprov_op_compare( Operation *op, SlapReply *rs )
1819 {
1820         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1821         syncprov_info_t         *si = on->on_bi.bi_private;
1822         int rc = SLAP_CB_CONTINUE;
1823
1824         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1825                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1826         {
1827                 Entry e = {0};
1828                 Attribute a = {0};
1829
1830                 e.e_name = op->o_bd->be_suffix[0];
1831                 e.e_nname = op->o_bd->be_nsuffix[0];
1832                 e.e_attrs = &a;
1833
1834                 a.a_desc = slap_schema.si_ad_contextCSN;
1835
1836                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1837
1838                 a.a_vals = si->si_ctxcsn;
1839                 a.a_nvals = a.a_vals;
1840                 a.a_numvals = si->si_numcsns;
1841
1842                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1843                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1844                 if ( ! rs->sr_err ) {
1845                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1846                         goto return_results;
1847                 }
1848
1849                 if ( get_assert( op ) &&
1850                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1851                 {
1852                         rs->sr_err = LDAP_ASSERTION_FAILED;
1853                         goto return_results;
1854                 }
1855
1856
1857                 rs->sr_err = LDAP_COMPARE_FALSE;
1858
1859                 if ( attr_valfind( &a,
1860                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1861                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1862                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1863                 {
1864                         rs->sr_err = LDAP_COMPARE_TRUE;
1865                 }
1866
1867 return_results:;
1868
1869                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1870
1871                 send_ldap_result( op, rs );
1872
1873                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1874                         rs->sr_err = LDAP_SUCCESS;
1875                 }
1876                 rc = rs->sr_err;
1877         }
1878
1879         return rc;
1880 }
1881
1882 static int
1883 syncprov_op_mod( Operation *op, SlapReply *rs )
1884 {
1885         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1886         syncprov_info_t         *si = on->on_bi.bi_private;
1887         slap_callback *cb;
1888         opcookie *opc;
1889         int have_psearches, cbsize;
1890
1891         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1892         have_psearches = ( si->si_ops != NULL );
1893         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1894
1895         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1896                 (have_psearches ? sizeof(modinst) : 0 );
1897
1898         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1899         opc = (opcookie *)(cb+1);
1900         opc->son = on;
1901         cb->sc_response = syncprov_op_response;
1902         cb->sc_cleanup = syncprov_op_cleanup;
1903         cb->sc_private = opc;
1904         cb->sc_next = op->o_callback;
1905         op->o_callback = cb;
1906
1907         opc->osid = -1;
1908         opc->rsid = -1;
1909         if ( op->o_csn.bv_val ) {
1910                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1911         }
1912         if ( op->o_controls ) {
1913                 struct sync_cookie *scook =
1914                 op->o_controls[slap_cids.sc_LDAPsync];
1915                 if ( scook )
1916                         opc->rsid = scook->sid;
1917         }
1918
1919         /* If there are active persistent searches, lock this operation.
1920          * See seqmod.c for the locking logic on its own.
1921          */
1922         if ( have_psearches ) {
1923                 modtarget *mt, mtdummy;
1924                 modinst *mi;
1925
1926                 mi = (modinst *)(opc+1);
1927                 mi->mi_op = op;
1928
1929                 /* See if we're already modifying this entry... */
1930                 mtdummy.mt_op = op;
1931                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1932                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1933                 if ( mt ) {
1934                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1935                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1936                         mt->mt_tail->mi_next = mi;
1937                         mt->mt_tail = mi;
1938                         /* wait for this op to get to head of list */
1939                         while ( mt->mt_mods != mi ) {
1940                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1941                                 /* FIXME: if dynamic config can delete overlays or
1942                                  * databases we'll have to check for cleanup here.
1943                                  * Currently it's not an issue because there are
1944                                  * no dynamic config deletes...
1945                                  */
1946                                 if ( slapd_shutdown )
1947                                         return SLAPD_ABANDON;
1948
1949                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1950                                         ldap_pvt_thread_yield();
1951                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1952
1953                                 /* clean up if the caller is giving up */
1954                                 if ( op->o_abandon ) {
1955                                         modinst *m2;
1956                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1957                                                 m2 = m2->mi_next );
1958                                         m2->mi_next = mi->mi_next;
1959                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1960                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1961                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1962                                         return SLAPD_ABANDON;
1963                                 }
1964                         }
1965                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1966                 } else {
1967                         /* Record that we're modifying this entry now */
1968                         mt = ch_malloc( sizeof(modtarget) );
1969                         mt->mt_mods = mi;
1970                         mt->mt_tail = mi;
1971                         mt->mt_op = mi->mi_op;
1972                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1973                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1974                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1975                 }
1976                 opc->smt = mt;
1977         }
1978
1979         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1980                 syncprov_matchops( op, opc, 1 );
1981
1982         return SLAP_CB_CONTINUE;
1983 }
1984
1985 static int
1986 syncprov_op_extended( Operation *op, SlapReply *rs )
1987 {
1988         if ( exop_is_write( op ))
1989                 return syncprov_op_mod( op, rs );
1990
1991         return SLAP_CB_CONTINUE;
1992 }
1993
1994 typedef struct searchstate {
1995         slap_overinst *ss_on;
1996         syncops *ss_so;
1997         BerVarray ss_ctxcsn;
1998         int *ss_sids;
1999         int ss_numcsns;
2000 #define SS_PRESENT      0x01
2001 #define SS_CHANGED      0x02
2002         int ss_flags;
2003 } searchstate;
2004
2005 static int
2006 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2007 {
2008         if ( rs->sr_ctrls ) {
2009                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2010                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2011                 rs->sr_ctrls = NULL;
2012         }
2013         return 0;
2014 }
2015
2016 typedef struct SyncOperationBuffer {
2017         Operation               sob_op;
2018         Opheader                sob_hdr;
2019         OpExtra                 sob_oe;
2020         AttributeName   sob_extra;      /* not always present */
2021         /* Further data allocated here */
2022 } SyncOperationBuffer;
2023
2024 static void
2025 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2026 {
2027         SyncOperationBuffer *sopbuf2;
2028         Operation *op2;
2029         int i, alen = 0;
2030         size_t size;
2031         char *ptr;
2032         GroupAssertion *g1, *g2;
2033
2034         /* count the search attrs */
2035         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2036                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2037         }
2038         /* Make a new copy of the operation */
2039         size = offsetof( SyncOperationBuffer, sob_extra ) +
2040                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2041                 op->o_req_dn.bv_len + 1 +
2042                 op->o_req_ndn.bv_len + 1 +
2043                 op->o_ndn.bv_len + 1 +
2044                 so->s_filterstr.bv_len + 1;
2045         sopbuf2 = ch_calloc( 1, size );
2046         op2 = &sopbuf2->sob_op;
2047         op2->o_hdr = &sopbuf2->sob_hdr;
2048         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2049
2050         /* Copy the fields we care about explicitly, leave the rest alone */
2051         *op2->o_hdr = *op->o_hdr;
2052         op2->o_tag = op->o_tag;
2053         op2->o_time = op->o_time;
2054         op2->o_bd = on->on_info->oi_origdb;
2055         op2->o_request = op->o_request;
2056         op2->o_managedsait = op->o_managedsait;
2057         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2058         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2059
2060         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2061         if ( i ) {
2062                 op2->ors_attrs = (AttributeName *) ptr;
2063                 ptr = (char *) &op2->ors_attrs[i+1];
2064                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2065                         op2->ors_attrs[i] = op->ors_attrs[i];
2066                         op2->ors_attrs[i].an_name.bv_val = ptr;
2067                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2068                 }
2069                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2070         }
2071
2072         op2->o_authz = op->o_authz;
2073         op2->o_ndn.bv_val = ptr;
2074         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2075         op2->o_dn = op2->o_ndn;
2076         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2077         op2->o_req_dn.bv_val = ptr;
2078         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2079         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2080         op2->o_req_ndn.bv_val = ptr;
2081         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2082         op2->ors_filterstr.bv_val = ptr;
2083         strcpy( ptr, so->s_filterstr.bv_val );
2084         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2085
2086         /* Skip the AND/GE clause that we stuck on in front */
2087         if ( so->s_flags & PS_FIX_FILTER ) {
2088                 op2->ors_filter = op->ors_filter->f_and->f_next;
2089                 so->s_flags ^= PS_FIX_FILTER;
2090         } else {
2091                 op2->ors_filter = op->ors_filter;
2092         }
2093         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2094         so->s_op = op2;
2095
2096         /* Copy any cached group ACLs individually */
2097         op2->o_groups = NULL;
2098         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2099                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2100                 *g2 = *g1;
2101                 strcpy( g2->ga_ndn, g1->ga_ndn );
2102                 g2->ga_next = op2->o_groups;
2103                 op2->o_groups = g2;
2104         }
2105         /* Don't allow any further group caching */
2106         op2->o_do_not_cache = 1;
2107
2108         /* Add op2 to conn so abandon will find us */
2109         op->o_conn->c_n_ops_executing++;
2110         op->o_conn->c_n_ops_completed--;
2111         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2112         so->s_flags |= PS_IS_DETACHED;
2113
2114         /* Prevent anyone else from trying to send a result for this op */
2115         op->o_abandon = 1;
2116 }
2117
2118 static int
2119 syncprov_search_response( Operation *op, SlapReply *rs )
2120 {
2121         searchstate *ss = op->o_callback->sc_private;
2122         slap_overinst *on = ss->ss_on;
2123         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2124         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2125
2126         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2127                 Attribute *a;
2128                 /* If we got a referral without a referral object, there's
2129                  * something missing that we cannot replicate. Just ignore it.
2130                  * The consumer will abort because we didn't send the expected
2131                  * control.
2132                  */
2133                 if ( !rs->sr_entry ) {
2134                         assert( rs->sr_entry != NULL );
2135                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2136                         return SLAP_CB_CONTINUE;
2137                 }
2138                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2139                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2140                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2141                 }
2142                 if ( a ) {
2143                         int i, sid;
2144                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2145
2146                         /* Don't send changed entries back to the originator */
2147                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2148                                 Debug( LDAP_DEBUG_SYNC,
2149                                         "Entry %s changed by peer, ignored\n",
2150                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2151                                 return LDAP_SUCCESS;
2152                         }
2153
2154                         /* If not a persistent search */
2155                         if ( !ss->ss_so ) {
2156                                 /* Make sure entry is less than the snapshot'd contextCSN */
2157                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2158                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2159                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2160                                                 Debug( LDAP_DEBUG_SYNC,
2161                                                         "Entry %s CSN %s greater than snapshot %s\n",
2162                                                         rs->sr_entry->e_name.bv_val,
2163                                                         a->a_nvals[0].bv_val,
2164                                                         ss->ss_ctxcsn[i].bv_val );
2165                                                 return LDAP_SUCCESS;
2166                                         }
2167                                 }
2168                         }
2169
2170                         /* Don't send old entries twice */
2171                         if ( srs->sr_state.ctxcsn ) {
2172                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2173                                         if ( sid == srs->sr_state.sids[i] &&
2174                                                 ber_bvcmp( &a->a_nvals[0],
2175                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2176                                                 Debug( LDAP_DEBUG_SYNC,
2177                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2178                                                         rs->sr_entry->e_name.bv_val,
2179                                                         a->a_nvals[0].bv_val,
2180                                                         srs->sr_state.ctxcsn[i].bv_val );
2181                                                 return LDAP_SUCCESS;
2182                                         }
2183                                 }
2184                         }
2185                 }
2186                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2187                         op->o_tmpmemctx );
2188                 rs->sr_ctrls[1] = NULL;
2189                 /* If we're in delta-sync mode, always send a cookie */
2190                 if ( si->si_nopres && si->si_usehint && a ) {
2191                         struct berval cookie;
2192                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2193                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2194                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2195                 } else {
2196                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2197                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2198                 }
2199         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2200                 struct berval cookie;
2201
2202                 if ( ss->ss_flags & SS_CHANGED ) {
2203                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2204                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2205
2206                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2207                 }
2208
2209                 /* Is this a regular refresh?
2210                  * Note: refresh never gets here if there were no changes
2211                  */
2212                 if ( !ss->ss_so ) {
2213                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2214                                 op->o_tmpmemctx );
2215                         rs->sr_ctrls[1] = NULL;
2216                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2217                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2218                                         LDAP_SYNC_REFRESH_DELETES );
2219                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2220                 } else {
2221                 /* It's RefreshAndPersist, transition to Persist phase */
2222                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2223                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2224                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2225                                 1, NULL, 0 );
2226                         if ( ss->ss_flags & SS_CHANGED )
2227                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2228
2229                         /* Detach this Op from frontend control */
2230                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2231
2232                         /* But not if this connection was closed along the way */
2233                         if ( op->o_abandon ) {
2234                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2235                                 /* syncprov_ab_cleanup will free this syncop */
2236                                 return SLAPD_ABANDON;
2237
2238                         } else {
2239                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2240                                 /* Turn off the refreshing flag */
2241                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2242
2243                                 syncprov_detach_op( op, ss->ss_so, on );
2244
2245                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2246
2247                                 /* If there are queued responses, fire them off */
2248                                 if ( ss->ss_so->s_res )
2249                                         syncprov_qstart( ss->ss_so );
2250                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2251                         }
2252
2253                         return LDAP_SUCCESS;
2254                 }
2255         }
2256
2257         return SLAP_CB_CONTINUE;
2258 }
2259
2260 static int
2261 syncprov_op_search( Operation *op, SlapReply *rs )
2262 {
2263         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2264         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2265         slap_callback   *cb;
2266         int gotstate = 0, changed = 0, do_present = 0;
2267         syncops *sop = NULL;
2268         searchstate *ss;
2269         sync_control *srs;
2270         BerVarray ctxcsn;
2271         int i, *sids, numcsns;
2272         struct berval mincsn;
2273
2274         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2275
2276         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2277                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2278                 return rs->sr_err;
2279         }
2280
2281         srs = op->o_controls[slap_cids.sc_LDAPsync];
2282
2283         /* If this is a persistent search, set it up right away */
2284         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2285                 syncops so = {0};
2286                 fbase_cookie fc;
2287                 opcookie opc;
2288                 slap_callback sc;
2289
2290                 fc.fss = &so;
2291                 fc.fbase = 0;
2292                 so.s_eid = NOID;
2293                 so.s_op = op;
2294                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2295                 /* syncprov_findbase expects to be called as a callback... */
2296                 sc.sc_private = &opc;
2297                 opc.son = on;
2298                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2299                 cb = op->o_callback;
2300                 op->o_callback = &sc;
2301                 rs->sr_err = syncprov_findbase( op, &fc );
2302                 op->o_callback = cb;
2303                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2304
2305                 if ( rs->sr_err != LDAP_SUCCESS ) {
2306                         send_ldap_result( op, rs );
2307                         return rs->sr_err;
2308                 }
2309                 sop = ch_malloc( sizeof( syncops ));
2310                 *sop = so;
2311                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2312                 sop->s_rid = srs->sr_state.rid;
2313                 sop->s_sid = srs->sr_state.sid;
2314                 sop->s_inuse = 1;
2315
2316                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2317                 sop->s_next = si->si_ops;
2318                 si->si_ops = sop;
2319                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2320         }
2321
2322         /* snapshot the ctxcsn */
2323         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2324         numcsns = si->si_numcsns;
2325         if ( numcsns ) {
2326                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2327                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2328                 for ( i=0; i<numcsns; i++ )
2329                         sids[i] = si->si_sids[i];
2330         } else {
2331                 ctxcsn = NULL;
2332                 sids = NULL;
2333         }
2334         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2335
2336         /* If we have a cookie, handle the PRESENT lookups */
2337         if ( srs->sr_state.ctxcsn ) {
2338                 sessionlog *sl;
2339                 int i, j;
2340
2341                 /* If we don't have any CSN of our own yet, pretend nothing
2342                  * has changed.
2343                  */
2344                 if ( !numcsns )
2345                         goto no_change;
2346
2347                 if ( !si->si_nopres )
2348                         do_present = SS_PRESENT;
2349
2350                 /* If there are SIDs we don't recognize in the cookie, drop them */
2351                 for (i=0; i<srs->sr_state.numcsns; ) {
2352                         for (j=0; j<numcsns; j++) {
2353                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2354                                         break;
2355                                 }
2356                         }
2357                         /* not found */
2358                         if ( j == numcsns ) {
2359                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2360                                 j = srs->sr_state.numcsns - 1;
2361                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2362                                 tmp.bv_len = 0;
2363                                 srs->sr_state.ctxcsn[j] = tmp;
2364                                 srs->sr_state.numcsns = j;
2365                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2366                                 continue;
2367                         }
2368                         i++;
2369                 }
2370
2371                 /* Find the smallest CSN */
2372                 mincsn = srs->sr_state.ctxcsn[0];
2373                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2374                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2375                                 mincsn = srs->sr_state.ctxcsn[i];
2376                 }
2377
2378                 /* If nothing has changed, shortcut it */
2379                 if ( srs->sr_state.numcsns == numcsns ) {
2380                         int i, j, newer;
2381                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2382                                 for ( j=0; j<numcsns; j++ ) {
2383                                         if ( srs->sr_state.sids[i] != sids[j] )
2384                                                 continue;
2385                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2386                                         /* If our state is newer, tell consumer about changes */
2387                                         if ( newer < 0 )
2388                                                 changed = SS_CHANGED;
2389                                         else if ( newer > 0 ) {
2390                                         /* our state is older, tell consumer nothing */
2391                                                 if ( sop ) {
2392                                                         syncops **sp = &si->si_ops;
2393
2394                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2395                                                         while ( *sp != sop )
2396                                                                 sp = &(*sp)->s_next;
2397                                                         *sp = sop->s_next;
2398                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2399                                                         ch_free( sop );
2400                                                 }
2401                                                 rs->sr_err = LDAP_SUCCESS;
2402                                                 rs->sr_ctrls = NULL;
2403                                                 send_ldap_result( op, rs );
2404                                                 return rs->sr_err;
2405                                         }
2406                                         break;
2407                                 }
2408                                 if ( changed )
2409                                         break;
2410                         }
2411                         if ( !changed ) {
2412                                 do_present = 0;
2413 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2414                                         LDAPControl     *ctrls[2];
2415
2416                                         ctrls[0] = NULL;
2417                                         ctrls[1] = NULL;
2418                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2419                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2420                                         rs->sr_ctrls = ctrls;
2421                                         rs->sr_err = LDAP_SUCCESS;
2422                                         send_ldap_result( op, rs );
2423                                         rs->sr_ctrls = NULL;
2424                                         return rs->sr_err;
2425                                 }
2426                                 goto shortcut;
2427                         }
2428                 } else {
2429                         /* consumer doesn't have the right number of CSNs */
2430                         changed = SS_CHANGED;
2431                 }
2432                 /* Do we have a sessionlog for this search? */
2433                 sl=si->si_logs;
2434                 if ( sl ) {
2435                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2436                         /* Are there any log entries, and is the consumer state
2437                          * present in the session log?
2438                          */
2439                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2440                                 do_present = 0;
2441                                 /* mutex is unlocked in playlog */
2442                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2443                         } else {
2444                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2445                         }
2446                 }
2447                 /* Is the CSN still present in the database? */
2448                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2449                         /* No, so a reload is required */
2450                         /* the 2.2 consumer doesn't send this hint */
2451                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2452                                 if ( ctxcsn )
2453                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2454                                 if ( sids )
2455                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2456                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2457                                 return rs->sr_err;
2458                         }
2459                         if ( srs->sr_state.ctxcsn ) {
2460                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2461                                 srs->sr_state.ctxcsn = NULL;
2462                         }
2463                         if ( srs->sr_state.sids ) {
2464                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2465                                 srs->sr_state.sids = NULL;
2466                         }
2467                         srs->sr_state.numcsns = 0;
2468                 } else {
2469                         gotstate = 1;
2470                         /* If changed and doing Present lookup, send Present UUIDs */
2471                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2472                                 LDAP_SUCCESS ) {
2473                                 if ( ctxcsn )
2474                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2475                                 if ( sids )
2476                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2477                                 send_ldap_result( op, rs );
2478                                 return rs->sr_err;
2479                         }
2480                 }
2481         } else {
2482                 /* No consumer state, assume something has changed */
2483                 changed = SS_CHANGED;
2484         }
2485
2486 shortcut:
2487         /* Append CSN range to search filter, save original filter
2488          * for persistent search evaluation
2489          */
2490         if ( sop ) {
2491                 sop->s_filterstr= op->ors_filterstr;
2492         }
2493
2494         /* If something changed, find the changes */
2495         if ( gotstate && changed ) {
2496                 Filter *fand, *fava;
2497
2498                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2499                 fand->f_choice = LDAP_FILTER_AND;
2500                 fand->f_next = NULL;
2501                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2502                 fand->f_and = fava;
2503                 fava->f_choice = LDAP_FILTER_GE;
2504                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2505                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2506 #ifdef LDAP_COMP_MATCH
2507                 fava->f_ava->aa_cf = NULL;
2508 #endif
2509                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2510                 fava->f_next = op->ors_filter;
2511                 op->ors_filter = fand;
2512                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2513                 if ( sop )
2514                         sop->s_flags |= PS_FIX_FILTER;
2515         }
2516
2517         /* Let our callback add needed info to returned entries */
2518         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2519         ss = (searchstate *)(cb+1);
2520         ss->ss_on = on;
2521         ss->ss_so = sop;
2522         ss->ss_flags = do_present | changed;
2523         ss->ss_ctxcsn = ctxcsn;
2524         ss->ss_numcsns = numcsns;
2525         ss->ss_sids = sids;
2526         cb->sc_response = syncprov_search_response;
2527         cb->sc_cleanup = syncprov_search_cleanup;
2528         cb->sc_private = ss;
2529         cb->sc_next = op->o_callback;
2530         op->o_callback = cb;
2531
2532         /* If this is a persistent search and no changes were reported during
2533          * the refresh phase, just invoke the response callback to transition
2534          * us into persist phase
2535          */
2536         if ( !changed ) {
2537                 rs->sr_err = LDAP_SUCCESS;
2538                 rs->sr_nentries = 0;
2539                 send_ldap_result( op, rs );
2540                 return rs->sr_err;
2541         }
2542         return SLAP_CB_CONTINUE;
2543 }
2544
2545 static int
2546 syncprov_operational(
2547         Operation *op,
2548         SlapReply *rs )
2549 {
2550         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2551         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2552
2553         /* This prevents generating unnecessarily; frontend will strip
2554          * any statically stored copy.
2555          */
2556         if ( op->o_sync != SLAP_CONTROL_NONE )
2557                 return SLAP_CB_CONTINUE;
2558
2559         if ( rs->sr_entry &&
2560                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2561
2562                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2563                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2564                         Attribute *a, **ap = NULL;
2565
2566                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2567                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2568                                         break;
2569                         }
2570
2571                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2572                         if ( si->si_ctxcsn ) {
2573                                 if ( !a ) {
2574                                         for ( ap = &rs->sr_operational_attrs; *ap;
2575                                                 ap=&(*ap)->a_next );
2576
2577                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2578                                         *ap = a;
2579                                 }
2580
2581                                 if ( !ap ) {
2582                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2583                                                 Entry *e = entry_dup( rs->sr_entry );
2584                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2585                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2586                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2587                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2588                                                         entry_free( rs->sr_entry );
2589                                                 }
2590                                                 rs->sr_entry = e;
2591                                                 rs->sr_flags |=
2592                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2593                                                 a = attr_find( rs->sr_entry->e_attrs,
2594                                                         slap_schema.si_ad_contextCSN );
2595                                         }
2596                                         if ( a->a_nvals != a->a_vals ) {
2597                                                 ber_bvarray_free( a->a_nvals );
2598                                         }
2599                                         a->a_nvals = NULL;
2600                                         ber_bvarray_free( a->a_vals );
2601                                         a->a_vals = NULL;
2602                                         a->a_numvals = 0;
2603                                 }
2604                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2605                         }
2606                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2607                 }
2608         }
2609         return SLAP_CB_CONTINUE;
2610 }
2611
2612 enum {
2613         SP_CHKPT = 1,
2614         SP_SESSL,
2615         SP_NOPRES,
2616         SP_USEHINT
2617 };
2618
2619 static ConfigDriver sp_cf_gen;
2620
2621 static ConfigTable spcfg[] = {
2622         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2623                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2624                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2625                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2626         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2627                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2628                         "DESC 'Session log size in ops' "
2629                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2630         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2631                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2632                         "DESC 'Omit Present phase processing' "
2633                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2634         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2635                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2636                         "DESC 'Observe Reload Hint in Request control' "
2637                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2638         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2639 };
2640
2641 static ConfigOCs spocs[] = {
2642         { "( OLcfgOvOc:1.1 "
2643                 "NAME 'olcSyncProvConfig' "
2644                 "DESC 'SyncRepl Provider configuration' "
2645                 "SUP olcOverlayConfig "
2646                 "MAY ( olcSpCheckpoint "
2647                         "$ olcSpSessionlog "
2648                         "$ olcSpNoPresent "
2649                         "$ olcSpReloadHint "
2650                 ") )",
2651                         Cft_Overlay, spcfg },
2652         { NULL, 0, NULL }
2653 };
2654
2655 static int
2656 sp_cf_gen(ConfigArgs *c)
2657 {
2658         slap_overinst           *on = (slap_overinst *)c->bi;
2659         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2660         int rc = 0;
2661
2662         if ( c->op == SLAP_CONFIG_EMIT ) {
2663                 switch ( c->type ) {
2664                 case SP_CHKPT:
2665                         if ( si->si_chkops || si->si_chktime ) {
2666                                 struct berval bv;
2667                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2668                                         "%d %d", si->si_chkops, si->si_chktime );
2669                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2670                                         rc = 1;
2671                                 } else {
2672                                         bv.bv_val = c->cr_msg;
2673                                         value_add_one( &c->rvalue_vals, &bv );
2674                                 }
2675                         } else {
2676                                 rc = 1;
2677                         }
2678                         break;
2679                 case SP_SESSL:
2680                         if ( si->si_logs ) {
2681                                 c->value_int = si->si_logs->sl_size;
2682                         } else {
2683                                 rc = 1;
2684                         }
2685                         break;
2686                 case SP_NOPRES:
2687                         if ( si->si_nopres ) {
2688                                 c->value_int = 1;
2689                         } else {
2690                                 rc = 1;
2691                         }
2692                         break;
2693                 case SP_USEHINT:
2694                         if ( si->si_usehint ) {
2695                                 c->value_int = 1;
2696                         } else {
2697                                 rc = 1;
2698                         }
2699                         break;
2700                 }
2701                 return rc;
2702         } else if ( c->op == LDAP_MOD_DELETE ) {
2703                 switch ( c->type ) {
2704                 case SP_CHKPT:
2705                         si->si_chkops = 0;
2706                         si->si_chktime = 0;
2707                         break;
2708                 case SP_SESSL:
2709                         if ( si->si_logs )
2710                                 si->si_logs->sl_size = 0;
2711                         else
2712                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2713                         break;
2714                 case SP_NOPRES:
2715                         if ( si->si_nopres )
2716                                 si->si_nopres = 0;
2717                         else
2718                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2719                         break;
2720                 case SP_USEHINT:
2721                         if ( si->si_usehint )
2722                                 si->si_usehint = 0;
2723                         else
2724                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2725                         break;
2726                 }
2727                 return rc;
2728         }
2729         switch ( c->type ) {
2730         case SP_CHKPT:
2731                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2732                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2733                                 c->argv[0], c->argv[1] );
2734                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2735                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2736                         return ARG_BAD_CONF;
2737                 }
2738                 if ( si->si_chkops <= 0 ) {
2739                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2740                                 c->argv[0], si->si_chkops );
2741                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2742                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2743                         return ARG_BAD_CONF;
2744                 }
2745                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2746                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2747                                 c->argv[0], c->argv[1] );
2748                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2749                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2750                         return ARG_BAD_CONF;
2751                 }
2752                 if ( si->si_chktime <= 0 ) {
2753                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2754                                 c->argv[0], si->si_chkops );
2755                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2756                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2757                         return ARG_BAD_CONF;
2758                 }
2759                 si->si_chktime *= 60;
2760                 break;
2761         case SP_SESSL: {
2762                 sessionlog *sl;
2763                 int size = c->value_int;
2764
2765                 if ( size < 0 ) {
2766                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2767                                 c->argv[0], size );
2768                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2769                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2770                         return ARG_BAD_CONF;
2771                 }
2772                 sl = si->si_logs;
2773                 if ( !sl ) {
2774                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2775                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2776                         sl->sl_mincsn.bv_len = 0;
2777                         sl->sl_num = 0;
2778                         sl->sl_head = sl->sl_tail = NULL;
2779                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2780                         si->si_logs = sl;
2781                 }
2782                 sl->sl_size = size;
2783                 }
2784                 break;
2785         case SP_NOPRES:
2786                 si->si_nopres = c->value_int;
2787                 break;
2788         case SP_USEHINT:
2789                 si->si_usehint = c->value_int;
2790                 break;
2791         }
2792         return rc;
2793 }
2794
2795 /* ITS#3456 we cannot run this search on the main thread, must use a
2796  * child thread in order to insure we have a big enough stack.
2797  */
2798 static void *
2799 syncprov_db_otask(
2800         void *ptr
2801 )
2802 {
2803         syncprov_findcsn( ptr, FIND_MAXCSN );
2804         return NULL;
2805 }
2806
2807 /* Read any existing contextCSN from the underlying db.
2808  * Then search for any entries newer than that. If no value exists,
2809  * just generate it. Cache whatever result.
2810  */
2811 static int
2812 syncprov_db_open(
2813         BackendDB *be,
2814         ConfigReply *cr
2815 )
2816 {
2817         slap_overinst   *on = (slap_overinst *) be->bd_info;
2818         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2819
2820         Connection conn = { 0 };
2821         OperationBuffer opbuf;
2822         Operation *op;
2823         Entry *e = NULL;
2824         Attribute *a;
2825         int rc;
2826         void *thrctx = NULL;
2827
2828         if ( !SLAP_LASTMOD( be )) {
2829                 Debug( LDAP_DEBUG_ANY,
2830                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2831                 return -1;
2832         }
2833
2834         if ( slapMode & SLAP_TOOL_MODE ) {
2835                 return 0;
2836         }
2837
2838         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2839         if ( rc ) {
2840                 return rc;
2841         }
2842
2843         thrctx = ldap_pvt_thread_pool_context();
2844         connection_fake_init( &conn, &opbuf, thrctx );
2845         op = &opbuf.ob_op;
2846         op->o_bd = be;
2847         op->o_dn = be->be_rootdn;
2848         op->o_ndn = be->be_rootndn;
2849
2850         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2851                 slap_schema.si_ad_contextCSN, 0, &e, on );
2852
2853         if ( e ) {
2854                 ldap_pvt_thread_t tid;
2855
2856                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2857                 if ( a ) {
2858                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2859                         si->si_numcsns = a->a_numvals;
2860                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2861                 }
2862                 overlay_entry_release_ov( op, e, 0, on );
2863                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2864                         op->o_req_dn = be->be_suffix[0];
2865                         op->o_req_ndn = be->be_nsuffix[0];
2866                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2867                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2868                         ldap_pvt_thread_join( tid, NULL );
2869                 }
2870         }
2871
2872         /* Didn't find a contextCSN, should we generate one? */
2873         if ( !si->si_ctxcsn ) {
2874                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2875                 struct berval csn;
2876
2877                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2878                 /* If we're also a consumer, then don't generate anything.
2879                  * Wait for our provider to send it to us, or for a local
2880                  * modify if we have multimaster.
2881                  */
2882                         goto out;
2883                 }
2884                 csn.bv_val = csnbuf;
2885                 csn.bv_len = sizeof( csnbuf );
2886                 slap_get_csn( op, &csn, 0 );
2887                 value_add_one( &si->si_ctxcsn, &csn );
2888                 si->si_numcsns = 1;
2889                 si->si_sids = ch_malloc( sizeof(int) );
2890                 si->si_sids[0] = slap_serverID;
2891
2892                 /* make sure we do a checkpoint on close */
2893                 si->si_numops++;
2894         }
2895
2896 out:
2897         op->o_bd->bd_info = (BackendInfo *)on;
2898         return 0;
2899 }
2900
2901 /* Write the current contextCSN into the underlying db.
2902  */
2903 static int
2904 syncprov_db_close(
2905         BackendDB *be,
2906         ConfigReply *cr
2907 )
2908 {
2909     slap_overinst   *on = (slap_overinst *) be->bd_info;
2910     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2911
2912         if ( slapMode & SLAP_TOOL_MODE ) {
2913                 return 0;
2914         }
2915         if ( si->si_numops ) {
2916                 Connection conn = {0};
2917                 OperationBuffer opbuf;
2918                 Operation *op;
2919                 SlapReply rs = {REP_RESULT};
2920                 void *thrctx;
2921
2922                 thrctx = ldap_pvt_thread_pool_context();
2923                 connection_fake_init( &conn, &opbuf, thrctx );
2924                 op = &opbuf.ob_op;
2925                 op->o_bd = be;
2926                 op->o_dn = be->be_rootdn;
2927                 op->o_ndn = be->be_rootndn;
2928                 syncprov_checkpoint( op, &rs, on );
2929         }
2930
2931     return 0;
2932 }
2933
2934 static int
2935 syncprov_db_init(
2936         BackendDB *be,
2937         ConfigReply *cr
2938 )
2939 {
2940         slap_overinst   *on = (slap_overinst *)be->bd_info;
2941         syncprov_info_t *si;
2942
2943         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2944                 Debug( LDAP_DEBUG_ANY,
2945                         "syncprov must be instantiated within a database.\n",
2946                         0, 0, 0 );
2947                 return 1;
2948         }
2949
2950         si = ch_calloc(1, sizeof(syncprov_info_t));
2951         on->on_bi.bi_private = si;
2952         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2953         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2954         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2955
2956         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2957         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2958         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2959         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2960
2961         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2962         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2963
2964         return 0;
2965 }
2966
2967 static int
2968 syncprov_db_destroy(
2969         BackendDB *be,
2970         ConfigReply *cr
2971 )
2972 {
2973         slap_overinst   *on = (slap_overinst *)be->bd_info;
2974         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2975
2976         if ( si ) {
2977                 if ( si->si_logs ) {
2978                         slog_entry *se = si->si_logs->sl_head;
2979
2980                         while ( se ) {
2981                                 slog_entry *se_next = se->se_next;
2982                                 ch_free( se );
2983                                 se = se_next;
2984                         }
2985
2986                         ch_free( si->si_logs );
2987                 }
2988                 if ( si->si_ctxcsn )
2989                         ber_bvarray_free( si->si_ctxcsn );
2990                 if ( si->si_sids )
2991                         ch_free( si->si_sids );
2992                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2993                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2994                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2995                 ch_free( si );
2996         }
2997
2998         return 0;
2999 }
3000
3001 static int syncprov_parseCtrl (
3002         Operation *op,
3003         SlapReply *rs,
3004         LDAPControl *ctrl )
3005 {
3006         ber_tag_t tag;
3007         BerElementBuffer berbuf;
3008         BerElement *ber = (BerElement *)&berbuf;
3009         ber_int_t mode;
3010         ber_len_t len;
3011         struct berval cookie = BER_BVNULL;
3012         sync_control *sr;
3013         int rhint = 0;
3014
3015         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3016                 rs->sr_text = "Sync control specified multiple times";
3017                 return LDAP_PROTOCOL_ERROR;
3018         }
3019
3020         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3021                 rs->sr_text = "Sync control specified with pagedResults control";
3022                 return LDAP_PROTOCOL_ERROR;
3023         }
3024
3025         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3026                 rs->sr_text = "Sync control value is absent";
3027                 return LDAP_PROTOCOL_ERROR;
3028         }
3029
3030         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3031                 rs->sr_text = "Sync control value is empty";
3032                 return LDAP_PROTOCOL_ERROR;
3033         }
3034
3035         /* Parse the control value
3036          *      syncRequestValue ::= SEQUENCE {
3037          *              mode   ENUMERATED {
3038          *                      -- 0 unused
3039          *                      refreshOnly             (1),
3040          *                      -- 2 reserved
3041          *                      refreshAndPersist       (3)
3042          *              },
3043          *              cookie  syncCookie OPTIONAL
3044          *      }
3045          */
3046
3047         ber_init2( ber, &ctrl->ldctl_value, 0 );
3048
3049         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3050                 rs->sr_text = "Sync control : mode decoding error";
3051                 return LDAP_PROTOCOL_ERROR;
3052         }
3053
3054         switch( mode ) {
3055         case LDAP_SYNC_REFRESH_ONLY:
3056                 mode = SLAP_SYNC_REFRESH;
3057                 break;
3058         case LDAP_SYNC_REFRESH_AND_PERSIST:
3059                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3060                 break;
3061         default:
3062                 rs->sr_text = "Sync control : unknown update mode";
3063                 return LDAP_PROTOCOL_ERROR;
3064         }
3065
3066         tag = ber_peek_tag( ber, &len );
3067
3068         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3069                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3070                         rs->sr_text = "Sync control : cookie decoding error";
3071                         return LDAP_PROTOCOL_ERROR;
3072                 }
3073                 tag = ber_peek_tag( ber, &len );
3074         }
3075         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3076                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3077                         rs->sr_text = "Sync control : rhint decoding error";
3078                         return LDAP_PROTOCOL_ERROR;
3079                 }
3080         }
3081         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3082                         rs->sr_text = "Sync control : decoding error";
3083                         return LDAP_PROTOCOL_ERROR;
3084         }
3085         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3086         sr->sr_rhint = rhint;
3087         if (!BER_BVISNULL(&cookie)) {
3088                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3089                 /* If parse fails, pretend no cookie was sent */
3090                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3091                         sr->sr_state.rid == -1 ) {
3092                         if ( sr->sr_state.ctxcsn ) {
3093                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3094                                 sr->sr_state.ctxcsn = NULL;
3095                         }
3096                         sr->sr_state.numcsns = 0;
3097                 }
3098         }
3099
3100         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3101
3102         op->o_sync = ctrl->ldctl_iscritical
3103                 ? SLAP_CONTROL_CRITICAL
3104                 : SLAP_CONTROL_NONCRITICAL;
3105
3106         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3107
3108         return LDAP_SUCCESS;
3109 }
3110
3111 /* This overlay is set up for dynamic loading via moduleload. For static
3112  * configuration, you'll need to arrange for the slap_overinst to be
3113  * initialized and registered by some other function inside slapd.
3114  */
3115
3116 static slap_overinst            syncprov;
3117
3118 int
3119 syncprov_initialize()
3120 {
3121         int rc;
3122
3123         rc = register_supported_control( LDAP_CONTROL_SYNC,
3124                 SLAP_CTRL_SEARCH, NULL,
3125                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3126         if ( rc != LDAP_SUCCESS ) {
3127                 Debug( LDAP_DEBUG_ANY,
3128                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3129                 return rc;
3130         }
3131
3132         syncprov.on_bi.bi_type = "syncprov";
3133         syncprov.on_bi.bi_db_init = syncprov_db_init;
3134         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3135         syncprov.on_bi.bi_db_open = syncprov_db_open;
3136         syncprov.on_bi.bi_db_close = syncprov_db_close;
3137
3138         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3139         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3140
3141         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3142         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3143         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3144         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3145         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3146         syncprov.on_bi.bi_op_search = syncprov_op_search;
3147         syncprov.on_bi.bi_extended = syncprov_op_extended;
3148         syncprov.on_bi.bi_operational = syncprov_operational;
3149
3150         syncprov.on_bi.bi_cf_ocs = spocs;
3151
3152         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3153
3154         rc = config_register_schema( spcfg, spocs );
3155         if ( rc ) return rc;
3156
3157         return overlay_register( &syncprov );
3158 }
3159
3160 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3161 int
3162 init_module( int argc, char *argv[] )
3163 {
3164         return syncprov_initialize();
3165 }
3166 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3167
3168 #endif /* defined(SLAPD_OVER_SYNCPROV) */