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         struct berval   si_contextdn;
 128         int             *si_sids;
 129         int             si_numcsns;
 130         int             si_chkops;      /* checkpointing info */
 131         int             si_chktime;
 132         int             si_numops;      /* number of ops since last checkpoint */
 133         int             si_nopres;      /* Skip present phase */
 134         int             si_usehint;     /* use reload hint */
 135         time_t  si_chklast;     /* time of last checkpoint */
 136         Avlnode *si_mods;       /* entries being modified */
 137         sessionlog      *si_logs;
 138         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 139         ldap_pvt_thread_mutex_t si_ops_mutex;
 140         ldap_pvt_thread_mutex_t si_mods_mutex;
 141         ldap_pvt_thread_mutex_t si_resp_mutex;
 142 } syncprov_info_t;
 143
 144 typedef struct opcookie {
 145         slap_overinst *son;
 146         syncmatches *smatches;
 147         modtarget *smt;
 148         struct berval sdn;      /* DN of entry, for deletes */
 149         struct berval sndn;
 150         struct berval suuid;    /* UUID of entry */
 151         struct berval sctxcsn;
 152         short osid;     /* sid of op csn */
 153         short rsid;     /* sid of relay */
 154         short sreference;       /* Is the entry a reference? */
 155 } opcookie;
 156
 157 typedef struct fbase_cookie {
 158         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 159         syncops *fss;   /* persistent search we're testing against */
 160         int fbase;      /* if TRUE we found the search base and it's still valid */
 161         int fscope;     /* if TRUE then fdn is within the psearch scope */
 162 } fbase_cookie;
 163
 164 static AttributeName csn_anlist[3];
 165 static AttributeName uuid_anlist[2];
 166
 167 /* Build a LDAPsync intermediate state control */
 168 static int
 169 syncprov_state_ctrl(
 170         Operation       *op,
 171         SlapReply       *rs,
 172         Entry           *e,
 173         int             entry_sync_state,
 174         LDAPControl     **ctrls,
 175         int             num_ctrls,
 176         int             send_cookie,
 177         struct berval   *cookie )
 178 {
 179         Attribute* a;
 180         int ret;
 181
 182         BerElementBuffer berbuf;
 183         BerElement *ber = (BerElement *)&berbuf;
 184
 185         struct berval   entryuuid_bv = BER_BVNULL;
 186
 187         ber_init2( ber, 0, LBER_USE_DER );
 188         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 189
 190         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 191
 192         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 193                 AttributeDescription *desc = a->a_desc;
 194                 if ( desc == slap_schema.si_ad_entryUUID ) {
 195                         entryuuid_bv = a->a_nvals[0];
 196                         break;
 197                 }
 198         }
 199
 200         /* FIXME: what if entryuuid is NULL or empty ? */
 201
 202         if ( send_cookie && cookie ) {
 203                 ber_printf( ber, "{eOON}",
 204                         entry_sync_state, &entryuuid_bv, cookie );
 205         } else {
 206                 ber_printf( ber, "{eON}",
 207                         entry_sync_state, &entryuuid_bv );
 208         }
 209
 210         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 211         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 212         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 213
 214         ber_free_buf( ber );
 215
 216         if ( ret < 0 ) {
 217                 Debug( LDAP_DEBUG_TRACE,
 218                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 219                         0, 0, 0 );
 220                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 221                 return ret;
 222         }
 223
 224         return LDAP_SUCCESS;
 225 }
 226
 227 /* Build a LDAPsync final state control */
 228 static int
 229 syncprov_done_ctrl(
 230         Operation       *op,
 231         SlapReply       *rs,
 232         LDAPControl     **ctrls,
 233         int                     num_ctrls,
 234         int                     send_cookie,
 235         struct berval *cookie,
 236         int                     refreshDeletes )
 237 {
 238         int ret;
 239         BerElementBuffer berbuf;
 240         BerElement *ber = (BerElement *)&berbuf;
 241
 242         ber_init2( ber, NULL, LBER_USE_DER );
 243         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 244
 245         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 246
 247         ber_printf( ber, "{" );
 248         if ( send_cookie && cookie ) {
 249                 ber_printf( ber, "O", cookie );
 250         }
 251         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 252                 ber_printf( ber, "b", refreshDeletes );
 253         }
 254         ber_printf( ber, "N}" );
 255
 256         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 257         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 258         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 259
 260         ber_free_buf( ber );
 261
 262         if ( ret < 0 ) {
 263                 Debug( LDAP_DEBUG_TRACE,
 264                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 265                         0, 0, 0 );
 266                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 267                 return ret;
 268         }
 269
 270         return LDAP_SUCCESS;
 271 }
 272
 273 static int
 274 syncprov_sendinfo(
 275         Operation       *op,
 276         SlapReply       *rs,
 277         int                     type,
 278         struct berval *cookie,
 279         int                     refreshDone,
 280         BerVarray       syncUUIDs,
 281         int                     refreshDeletes )
 282 {
 283         BerElementBuffer berbuf;
 284         BerElement *ber = (BerElement *)&berbuf;
 285         struct berval rspdata;
 286
 287         int ret;
 288
 289         ber_init2( ber, NULL, LBER_USE_DER );
 290         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 291
 292         if ( type ) {
 293                 switch ( type ) {
 294                 case LDAP_TAG_SYNC_NEW_COOKIE:
 295                         ber_printf( ber, "tO", type, cookie );
 296                         break;
 297                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 298                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 299                         ber_printf( ber, "t{", type );
 300                         if ( cookie ) {
 301                                 ber_printf( ber, "O", cookie );
 302                         }
 303                         if ( refreshDone == 0 ) {
 304                                 ber_printf( ber, "b", refreshDone );
 305                         }
 306                         ber_printf( ber, "N}" );
 307                         break;
 308                 case LDAP_TAG_SYNC_ID_SET:
 309                         ber_printf( ber, "t{", type );
 310                         if ( cookie ) {
 311                                 ber_printf( ber, "O", cookie );
 312                         }
 313                         if ( refreshDeletes == 1 ) {
 314                                 ber_printf( ber, "b", refreshDeletes );
 315                         }
 316                         ber_printf( ber, "[W]", syncUUIDs );
 317                         ber_printf( ber, "N}" );
 318                         break;
 319                 default:
 320                         Debug( LDAP_DEBUG_TRACE,
 321                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 322                                 type, 0, 0 );
 323                         return LDAP_OTHER;
 324                 }
 325         }
 326
 327         ret = ber_flatten2( ber, &rspdata, 0 );
 328
 329         if ( ret < 0 ) {
 330                 Debug( LDAP_DEBUG_TRACE,
 331                         "syncprov_sendinfo: ber_flatten2 failed\n",
 332                         0, 0, 0 );
 333                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 334                 return ret;
 335         }
 336
 337         rs->sr_rspoid = LDAP_SYNC_INFO;
 338         rs->sr_rspdata = &rspdata;
 339         send_ldap_intermediate( op, rs );
 340         rs->sr_rspdata = NULL;
 341         ber_free_buf( ber );
 342
 343         return LDAP_SUCCESS;
 344 }
 345
 346 /* Find a modtarget in an AVL tree */
 347 static int
 348 sp_avl_cmp( const void *c1, const void *c2 )
 349 {
 350         const modtarget *m1, *m2;
 351         int rc;
 352
 353         m1 = c1; m2 = c2;
 354         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 355
 356         if ( rc ) return rc;
 357         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 358 }
 359
 360 /* syncprov_findbase:
 361  *   finds the true DN of the base of a search (with alias dereferencing) and
 362  * checks to make sure the base entry doesn't get replaced with a different
 363  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 364  * change is detected, any persistent search on this base must be terminated /
 365  * reloaded.
 366  *   On the first call, we just save the DN and entryID. On subsequent calls
 367  * we compare the DN and entryID with the saved values.
 368  */
 369 static int
 370 findbase_cb( Operation *op, SlapReply *rs )
 371 {
 372         slap_callback *sc = op->o_callback;
 373
 374         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 375                 fbase_cookie *fc = sc->sc_private;
 376
 377                 /* If no entryID, we're looking for the first time.
 378                  * Just store whatever we got.
 379                  */
 380                 if ( fc->fss->s_eid == NOID ) {
 381                         fc->fbase = 2;
 382                         fc->fss->s_eid = rs->sr_entry->e_id;
 383                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 384
 385                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 386                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 387
 388                 /* OK, the DN is the same and the entryID is the same. */
 389                         fc->fbase = 1;
 390                 }
 391         }
 392         if ( rs->sr_err != LDAP_SUCCESS ) {
 393                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 394         }
 395         return LDAP_SUCCESS;
 396 }
 397
 398 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 399 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 400
 401 static int
 402 syncprov_findbase( Operation *op, fbase_cookie *fc )
 403 {
 404         /* Use basic parameters from syncrepl search, but use
 405          * current op's threadctx / tmpmemctx
 406          */
 407         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 408         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 409                 slap_callback cb = {0};
 410                 Operation fop;
 411                 SlapReply frs = { REP_RESULT };
 412                 int rc;
 413
 414                 fc->fss->s_flags ^= PS_FIND_BASE;
 415                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 416
 417                 fop = *fc->fss->s_op;
 418
 419                 fop.o_bd = fop.o_bd->bd_self;
 420                 fop.o_hdr = op->o_hdr;
 421                 fop.o_time = op->o_time;
 422                 fop.o_tincr = op->o_tincr;
 423
 424                 cb.sc_response = findbase_cb;
 425                 cb.sc_private = fc;
 426
 427                 fop.o_sync_mode = 0;    /* turn off sync mode */
 428                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 429                 fop.o_callback = &cb;
 430                 fop.o_tag = LDAP_REQ_SEARCH;
 431                 fop.ors_scope = LDAP_SCOPE_BASE;
 432                 fop.ors_limit = NULL;
 433                 fop.ors_slimit = 1;
 434                 fop.ors_tlimit = SLAP_NO_LIMIT;
 435                 fop.ors_attrs = slap_anlist_no_attrs;
 436                 fop.ors_attrsonly = 1;
 437                 fop.ors_filter = &generic_filter;
 438                 fop.ors_filterstr = generic_filterstr;
 439
 440                 rc = fop.o_bd->be_search( &fop, &frs );
 441         } else {
 442                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 443                 fc->fbase = 1;
 444         }
 445
 446         /* After the first call, see if the fdn resides in the scope */
 447         if ( fc->fbase == 1 ) {
 448                 switch ( fc->fss->s_op->ors_scope ) {
 449                 case LDAP_SCOPE_BASE:
 450                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 451                         break;
 452                 case LDAP_SCOPE_ONELEVEL: {
 453                         struct berval pdn;
 454                         dnParent( fc->fdn, &pdn );
 455                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 456                         break; }
 457                 case LDAP_SCOPE_SUBTREE:
 458                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 459                         break;
 460                 case LDAP_SCOPE_SUBORDINATE:
 461                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 462                                 !dn_match( fc->fdn, &fc->fss->s_base );
 463                         break;
 464                 }
 465         }
 466
 467         if ( fc->fbase )
 468                 return LDAP_SUCCESS;
 469
 470         /* If entryID has changed, then the base of this search has
 471          * changed. Invalidate the psearch.
 472          */
 473         return LDAP_NO_SUCH_OBJECT;
 474 }
 475
 476 /* syncprov_findcsn:
 477  *   This function has three different purposes, but they all use a search
 478  * that filters on entryCSN so they're combined here.
 479  * 1: at startup time, after a contextCSN has been read from the database,
 480  * we search for all entries with CSN >= contextCSN in case the contextCSN
 481  * was not checkpointed at the previous shutdown.
 482  *
 483  * 2: when the current contextCSN is known and we have a sync cookie, we search
 484  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 485  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 486  *
 487  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 488  * CSN, and generate Present records for them. We always collect this result
 489  * in SyncID sets, even if there's only one match.
 490  */
 491 typedef enum find_csn_t {
 492         FIND_MAXCSN     = 1,
 493         FIND_CSN        = 2,
 494         FIND_PRESENT    = 3
 495 } find_csn_t;
 496
 497 static int
 498 findmax_cb( Operation *op, SlapReply *rs )
 499 {
 500         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 501                 struct berval *maxcsn = op->o_callback->sc_private;
 502                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 503                         slap_schema.si_ad_entryCSN );
 504
 505                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 506                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 507                         maxcsn->bv_len = a->a_vals[0].bv_len;
 508                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 509                 }
 510         }
 511         return LDAP_SUCCESS;
 512 }
 513
 514 static int
 515 findcsn_cb( Operation *op, SlapReply *rs )
 516 {
 517         slap_callback *sc = op->o_callback;
 518
 519         /* We just want to know that at least one exists, so it's OK if
 520          * we exceed the unchecked limit.
 521          */
 522         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 523                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 524                 sc->sc_private = (void *)1;
 525         }
 526         return LDAP_SUCCESS;
 527 }
 528
 529 /* Build a list of entryUUIDs for sending in a SyncID set */
 530
 531 #define UUID_LEN        16
 532
 533 typedef struct fpres_cookie {
 534         int num;
 535         BerVarray uuids;
 536         char *last;
 537 } fpres_cookie;
 538
 539 static int
 540 findpres_cb( Operation *op, SlapReply *rs )
 541 {
 542         slap_callback *sc = op->o_callback;
 543         fpres_cookie *pc = sc->sc_private;
 544         Attribute *a;
 545         int ret = SLAP_CB_CONTINUE;
 546
 547         switch ( rs->sr_type ) {
 548         case REP_SEARCH:
 549                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 550                 if ( a ) {
 551                         pc->uuids[pc->num].bv_val = pc->last;
 552                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 553                                 pc->uuids[pc->num].bv_len );
 554                         pc->num++;
 555                         pc->last = pc->uuids[pc->num].bv_val;
 556                         pc->uuids[pc->num].bv_val = NULL;
 557                 }
 558                 ret = LDAP_SUCCESS;
 559                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 560                         break;
 561                 /* FALLTHRU */
 562         case REP_RESULT:
 563                 ret = rs->sr_err;
 564                 if ( pc->num ) {
 565                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 566                                 0, pc->uuids, 0 );
 567                         pc->uuids[pc->num].bv_val = pc->last;
 568                         pc->num = 0;
 569                         pc->last = pc->uuids[0].bv_val;
 570                 }
 571                 break;
 572         default:
 573                 break;
 574         }
 575         return ret;
 576 }
 577
 578 static int
 579 syncprov_findcsn( Operation *op, find_csn_t mode )
 580 {
 581         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 582         syncprov_info_t         *si = on->on_bi.bi_private;
 583
 584         slap_callback cb = {0};
 585         Operation fop;
 586         SlapReply frs = { REP_RESULT };
 587         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 588         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 589         struct berval maxcsn;
 590         Filter cf;
 591         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 592         fpres_cookie pcookie;
 593         sync_control *srs = NULL;
 594         struct slap_limits_set fc_limits;
 595         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 596         int maxid;
 597
 598         if ( mode != FIND_MAXCSN ) {
 599                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 600         }
 601
 602         fop = *op;
 603         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 604         /* We want pure entries, not referrals */
 605         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 606
 607         cf.f_ava = &eq;
 608         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 609         BER_BVZERO( &cf.f_av_value );
 610         cf.f_next = NULL;
 611
 612         fop.o_callback = &cb;
 613         fop.ors_limit = NULL;
 614         fop.ors_tlimit = SLAP_NO_LIMIT;
 615         fop.ors_filter = &cf;
 616         fop.ors_filterstr.bv_val = buf;
 617
 618 again:
 619         switch( mode ) {
 620         case FIND_MAXCSN:
 621                 cf.f_choice = LDAP_FILTER_GE;
 622                 /* If there are multiple CSNs, use the one with our serverID */
 623                 for ( i=0; i<si->si_numcsns; i++) {
 624                         if ( slap_serverID == si->si_sids[i] ) {
 625                                 maxid = i;
 626                                 break;
 627                         }
 628                 }
 629                 if ( i == si->si_numcsns ) {
 630                         /* No match: this is multimaster, and none of the content in the DB
 631                          * originated locally. Treat like no CSN.
 632                          */
 633                         return LDAP_NO_SUCH_OBJECT;
 634                 }
 635                 cf.f_av_value = si->si_ctxcsn[maxid];
 636                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 637                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 638                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 639                         return LDAP_OTHER;
 640                 }
 641                 fop.ors_attrsonly = 0;
 642                 fop.ors_attrs = csn_anlist;
 643                 fop.ors_slimit = SLAP_NO_LIMIT;
 644                 cb.sc_private = &maxcsn;
 645                 cb.sc_response = findmax_cb;
 646                 strcpy( cbuf, cf.f_av_value.bv_val );
 647                 maxcsn.bv_val = cbuf;
 648                 maxcsn.bv_len = cf.f_av_value.bv_len;
 649                 break;
 650         case FIND_CSN:
 651                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 652                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 653                         /* If there are multiple CSNs, use the smallest */
 654                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 655                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 656                                         > 0 ) {
 657                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 658                                 }
 659                         }
 660                 }
 661                 /* Look for exact match the first time */
 662                 if ( findcsn_retry ) {
 663                         cf.f_choice = LDAP_FILTER_EQUALITY;
 664                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 665                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 666                 /* On retry, look for <= */
 667                 } else {
 668                         cf.f_choice = LDAP_FILTER_LE;
 669                         fop.ors_limit = &fc_limits;
 670                         memset( &fc_limits, 0, sizeof( fc_limits ));
 671                         fc_limits.lms_s_unchecked = 1;
 672                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 673                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 674                 }
 675                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 676                         return LDAP_OTHER;
 677                 }
 678                 fop.ors_attrsonly = 1;
 679                 fop.ors_attrs = slap_anlist_no_attrs;
 680                 fop.ors_slimit = 1;
 681                 cb.sc_private = NULL;
 682                 cb.sc_response = findcsn_cb;
 683                 break;
 684         case FIND_PRESENT:
 685                 fop.ors_filter = op->ors_filter;
 686                 fop.ors_filterstr = op->ors_filterstr;
 687                 fop.ors_attrsonly = 0;
 688                 fop.ors_attrs = uuid_anlist;
 689                 fop.ors_slimit = SLAP_NO_LIMIT;
 690                 cb.sc_private = &pcookie;
 691                 cb.sc_response = findpres_cb;
 692                 pcookie.num = 0;
 693
 694                 /* preallocate storage for a full set */
 695                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 696                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 697                         op->o_tmpmemctx );
 698                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 699                 pcookie.uuids[0].bv_val = pcookie.last;
 700                 pcookie.uuids[0].bv_len = UUID_LEN;
 701                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 702                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 703                         pcookie.uuids[i].bv_len = UUID_LEN;
 704                 }
 705                 break;
 706         }
 707
 708         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 709         fop.o_bd->be_search( &fop, &frs );
 710         fop.o_bd->bd_info = (BackendInfo *)on;
 711
 712         switch( mode ) {
 713         case FIND_MAXCSN:
 714                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 715 #ifdef CHECK_CSN
 716                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 717                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 718 #endif
 719                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 720                         si->si_numops++;        /* ensure a checkpoint */
 721                 }
 722                 break;
 723         case FIND_CSN:
 724                 /* If matching CSN was not found, invalidate the context. */
 725                 if ( !cb.sc_private ) {
 726                         /* If we didn't find an exact match, then try for <= */
 727                         if ( findcsn_retry ) {
 728                                 findcsn_retry = 0;
 729                                 goto again;
 730                         }
 731                         rc = LDAP_NO_SUCH_OBJECT;
 732                 }
 733                 break;
 734         case FIND_PRESENT:
 735                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 736                 break;
 737         }
 738
 739         return rc;
 740 }
 741
 742 static void
 743 syncprov_free_syncop( syncops *so )
 744 {
 745         syncres *sr, *srnext;
 746         GroupAssertion *ga, *gnext;
 747
 748         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 749         if ( --so->s_inuse > 0 ) {
 750                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 751                 return;
 752         }
 753         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 754         if ( so->s_flags & PS_IS_DETACHED ) {
 755                 filter_free( so->s_op->ors_filter );
 756                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 757                         gnext = ga->ga_next;
 758                         ch_free( ga );
 759                 }
 760                 ch_free( so->s_op );
 761         }
 762         ch_free( so->s_base.bv_val );
 763         for ( sr=so->s_res; sr; sr=srnext ) {
 764                 srnext = sr->s_next;
 765                 ch_free( sr );
 766         }
 767         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 768         ch_free( so );
 769 }
 770
 771 /* Send a persistent search response */
 772 static int
 773 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 774         Entry **e, int mode )
 775 {
 776         slap_overinst *on = opc->son;
 777
 778         SlapReply rs = { REP_SEARCH };
 779         LDAPControl *ctrls[2];
 780         struct berval cookie = BER_BVNULL, csns[2];
 781         Entry e_uuid = {0};
 782         Attribute a_uuid = {0};
 783
 784         if ( so->s_op->o_abandon )
 785                 return SLAPD_ABANDON;
 786
 787         ctrls[1] = NULL;
 788         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 789                 csns[0] = opc->sctxcsn;
 790                 BER_BVZERO( &csns[1] );
 791                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 792         }
 793
 794 #ifdef LDAP_DEBUG
 795         if ( !BER_BVISNULL( &cookie )) {
 796                 if ( so->s_sid > 0 ) {
 797                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 798                                 so->s_sid, cookie.bv_val , 0 );
 799                 } else {
 800                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 801                                 cookie.bv_val, 0, 0 );
 802                 }
 803         }
 804 #endif
 805
 806         e_uuid.e_attrs = &a_uuid;
 807         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 808         a_uuid.a_nvals = &opc->suuid;
 809         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 810                 mode, ctrls, 0, 1, &cookie );
 811         if ( !BER_BVISNULL( &cookie )) {
 812                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 813         }
 814
 815         rs.sr_ctrls = ctrls;
 816         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 817         switch( mode ) {
 818         case LDAP_SYNC_ADD:
 819                 rs.sr_entry = *e;
 820                 if ( rs.sr_entry->e_private )
 821                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 822                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 823                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 824                         rs.sr_err = send_search_reference( op, &rs );
 825                         ber_bvarray_free( rs.sr_ref );
 826                         if ( !rs.sr_entry )
 827                                 *e = NULL;
 828                         break;
 829                 }
 830                 /* fallthru */
 831         case LDAP_SYNC_MODIFY:
 832                 rs.sr_entry = *e;
 833                 if ( rs.sr_entry->e_private )
 834                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 835                 rs.sr_attrs = op->ors_attrs;
 836                 rs.sr_err = send_search_entry( op, &rs );
 837                 if ( !rs.sr_entry )
 838                         *e = NULL;
 839                 break;
 840         case LDAP_SYNC_DELETE:
 841                 e_uuid.e_attrs = NULL;
 842                 e_uuid.e_name = opc->sdn;
 843                 e_uuid.e_nname = opc->sndn;
 844                 rs.sr_entry = &e_uuid;
 845                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 846                         struct berval bv = BER_BVNULL;
 847                         rs.sr_ref = &bv;
 848                         rs.sr_err = send_search_reference( op, &rs );
 849                 } else {
 850                         rs.sr_err = send_search_entry( op, &rs );
 851                 }
 852                 break;
 853         default:
 854                 assert(0);
 855         }
 856         /* In case someone else freed it already? */
 857         if ( rs.sr_ctrls ) {
 858                 int i;
 859                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 860                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 861                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 862                                 ctrls[0]->ldctl_value.bv_val = NULL;
 863                                 break;
 864                         }
 865                 }
 866                 rs.sr_ctrls = NULL;
 867         }
 868
 869         return rs.sr_err;
 870 }
 871
 872 static void
 873 syncprov_qstart( syncops *so );
 874
 875 /* Play back queued responses */
 876 static int
 877 syncprov_qplay( Operation *op, syncops *so )
 878 {
 879         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 880         syncres *sr;
 881         Entry *e;
 882         opcookie opc;
 883         int rc = 0;
 884
 885         opc.son = on;
 886
 887         do {
 888                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 889                 sr = so->s_res;
 890                 if ( sr )
 891                         so->s_res = sr->s_next;
 892                 if ( !so->s_res )
 893                         so->s_restail = NULL;
 894                 /* Exit loop with mutex held */
 895                 if ( !sr || so->s_op->o_abandon )
 896                         break;
 897                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 898
 899                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 900                     SlapReply rs = { REP_INTERMEDIATE };
 901
 902                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 903                                 &sr->s_csn, 0, NULL, 0 );
 904                 } else {
 905                         opc.sdn = sr->s_dn;
 906                         opc.sndn = sr->s_ndn;
 907                         opc.suuid = sr->s_uuid;
 908                         opc.sctxcsn = sr->s_csn;
 909                         opc.sreference = sr->s_isreference;
 910                         e = NULL;
 911
 912                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 913                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 914                                 if ( rc ) {
 915                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 916                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 917                                         ch_free( sr );
 918                                         rc = 0;
 919                                         continue;
 920                                 }
 921                         }
 922                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 923
 924                         if ( e ) {
 925                                 overlay_entry_release_ov( op, e, 0, on );
 926                         }
 927                 }
 928
 929                 ch_free( sr );
 930
 931                 /* Exit loop with mutex held */
 932                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 933
 934         } while (0);
 935
 936         /* We now only send one change at a time, to prevent one
 937          * psearch from hogging all the CPU. Resubmit this task if
 938          * there are more responses queued and no errors occurred.
 939          */
 940
 941         if ( rc == 0 && so->s_res ) {
 942                 syncprov_qstart( so );
 943         } else {
 944                 so->s_flags ^= PS_TASK_QUEUED;
 945         }
 946
 947         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 948         return rc;
 949 }
 950
 951 /* task for playing back queued responses */
 952 static void *
 953 syncprov_qtask( void *ctx, void *arg )
 954 {
 955         syncops *so = arg;
 956         OperationBuffer opbuf;
 957         Operation *op;
 958         BackendDB be;
 959         int rc;
 960
 961         op = &opbuf.ob_op;
 962         *op = *so->s_op;
 963         op->o_hdr = &opbuf.ob_hdr;
 964         op->o_controls = opbuf.ob_controls;
 965         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 966
 967         *op->o_hdr = *so->s_op->o_hdr;
 968
 969         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 970         op->o_tmpmfuncs = &slap_sl_mfuncs;
 971         op->o_threadctx = ctx;
 972
 973         /* syncprov_qplay expects a fake db */
 974         be = *so->s_op->o_bd;
 975         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 976         op->o_bd = &be;
 977         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 978         op->o_callback = NULL;
 979
 980         rc = syncprov_qplay( op, so );
 981
 982         /* decrement use count... */
 983         syncprov_free_syncop( so );
 984
 985         return NULL;
 986 }
 987
 988 /* Start the task to play back queued psearch responses */
 989 static void
 990 syncprov_qstart( syncops *so )
 991 {
 992         so->s_flags |= PS_TASK_QUEUED;
 993         so->s_inuse++;
 994         ldap_pvt_thread_pool_submit( &connection_pool,
 995                 syncprov_qtask, so );
 996 }
 997
 998 /* Queue a persistent search response */
 999 static int
1000 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1001 {
1002         syncres *sr;
1003         int srsize;
1004         struct berval cookie = opc->sctxcsn;
1005
1006         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1007                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1008
1009                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1010                         so->s_rid, slap_serverID ? slap_serverID : -1);
1011         }
1012
1013         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1014                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1015         if ( cookie.bv_len )
1016                 srsize += cookie.bv_len + 1;
1017         sr = ch_malloc( srsize );
1018         sr->s_next = NULL;
1019         sr->s_dn.bv_val = (char *)(sr + 1);
1020         sr->s_dn.bv_len = opc->sdn.bv_len;
1021         sr->s_mode = mode;
1022         sr->s_isreference = opc->sreference;
1023         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1024                  opc->sdn.bv_val ) + 1;
1025         sr->s_ndn.bv_len = opc->sndn.bv_len;
1026         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1027                  opc->sndn.bv_val ) + 1;
1028         sr->s_uuid.bv_len = opc->suuid.bv_len;
1029         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1030         if ( cookie.bv_len ) {
1031                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1032                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1033         } else {
1034                 sr->s_csn.bv_val = NULL;
1035         }
1036         sr->s_csn.bv_len = cookie.bv_len;
1037
1038         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1039                 ch_free( cookie.bv_val );
1040         }
1041
1042         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1043         if ( !so->s_res ) {
1044                 so->s_res = sr;
1045         } else {
1046                 so->s_restail->s_next = sr;
1047         }
1048         so->s_restail = sr;
1049
1050         /* If the base of the psearch was modified, check it next time round */
1051         if ( so->s_flags & PS_WROTE_BASE ) {
1052                 so->s_flags ^= PS_WROTE_BASE;
1053                 so->s_flags |= PS_FIND_BASE;
1054         }
1055         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1056                 syncprov_qstart( so );
1057         }
1058         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1059         return LDAP_SUCCESS;
1060 }
1061
1062 static int
1063 syncprov_drop_psearch( syncops *so, int lock )
1064 {
1065         if ( so->s_flags & PS_IS_DETACHED ) {
1066                 if ( lock )
1067                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1068                 so->s_op->o_conn->c_n_ops_executing--;
1069                 so->s_op->o_conn->c_n_ops_completed++;
1070                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1071                         o_next );
1072                 if ( lock )
1073                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1074         }
1075         syncprov_free_syncop( so );
1076
1077         return 0;
1078 }
1079
1080 static int
1081 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1082 {
1083         slap_callback *sc = op->o_callback;
1084         op->o_callback = sc->sc_next;
1085         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1086         op->o_tmpfree( sc, op->o_tmpmemctx );
1087         return 0;
1088 }
1089
1090 static int
1091 syncprov_op_abandon( Operation *op, SlapReply *rs )
1092 {
1093         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1094         syncprov_info_t         *si = on->on_bi.bi_private;
1095         syncops *so, *soprev;
1096
1097         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1098         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1099                 soprev=so, so=so->s_next ) {
1100                 if ( so->s_op->o_connid == op->o_connid &&
1101                         so->s_op->o_msgid == op->orn_msgid ) {
1102                                 so->s_op->o_abandon = 1;
1103                                 soprev->s_next = so->s_next;
1104                                 break;
1105                 }
1106         }
1107         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1108         if ( so ) {
1109                 /* Is this really a Cancel exop? */
1110                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1111                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1112                         rs->sr_err = LDAP_CANCELLED;
1113                         send_ldap_result( so->s_op, rs );
1114                         if ( so->s_flags & PS_IS_DETACHED ) {
1115                                 slap_callback *cb;
1116                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1117                                 cb->sc_cleanup = syncprov_ab_cleanup;
1118                                 cb->sc_next = op->o_callback;
1119                                 cb->sc_private = so;
1120                                 return SLAP_CB_CONTINUE;
1121                         }
1122                 }
1123                 syncprov_drop_psearch( so, 0 );
1124         }
1125         return SLAP_CB_CONTINUE;
1126 }
1127
1128 /* Find which persistent searches are affected by this operation */
1129 static void
1130 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1131 {
1132         slap_overinst *on = opc->son;
1133         syncprov_info_t         *si = on->on_bi.bi_private;
1134
1135         fbase_cookie fc;
1136         syncops *ss, *sprev, *snext;
1137         Entry *e = NULL;
1138         Attribute *a;
1139         int rc;
1140         struct berval newdn;
1141         int freefdn = 0;
1142         BackendDB *b0 = op->o_bd, db;
1143
1144         fc.fdn = &op->o_req_ndn;
1145         /* compute new DN */
1146         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1147                 struct berval pdn;
1148                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1149                 else dnParent( fc.fdn, &pdn );
1150                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1151                 fc.fdn = &newdn;
1152                 freefdn = 1;
1153         }
1154         if ( op->o_tag != LDAP_REQ_ADD ) {
1155                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1156                         db = *op->o_bd;
1157                         op->o_bd = &db;
1158                 }
1159                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1160                 /* If we're sending responses now, make a copy and unlock the DB */
1161                 if ( e && !saveit ) {
1162                         Entry *e2 = entry_dup( e );
1163                         overlay_entry_release_ov( op, e, 0, on );
1164                         e = e2;
1165                 }
1166                 if ( rc ) {
1167                         op->o_bd = b0;
1168                         return;
1169                 }
1170         } else {
1171                 e = op->ora_e;
1172         }
1173
1174         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1175                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1176                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1177                 opc->sreference = is_entry_referral( e );
1178                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1179                 if ( a )
1180                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1181         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1182                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1183                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1184                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1185                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1186         }
1187
1188         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1189         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1190                 sprev = ss, ss=snext)
1191         {
1192                 Operation op2;
1193                 Opheader oh;
1194                 syncmatches *sm;
1195                 int found = 0;
1196
1197                 snext = ss->s_next;
1198                 if ( ss->s_op->o_abandon )
1199                         continue;
1200
1201                 /* Don't send ops back to the originator */
1202                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1203                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1204                                 opc->osid, 0, 0 );
1205                         continue;
1206                 }
1207
1208                 /* Don't send ops back to the messenger */
1209                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1210                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1211                                 opc->rsid, 0, 0 );
1212                         continue;
1213                 }
1214
1215                 /* validate base */
1216                 fc.fss = ss;
1217                 fc.fbase = 0;
1218                 fc.fscope = 0;
1219
1220                 /* If the base of the search is missing, signal a refresh */
1221                 rc = syncprov_findbase( op, &fc );
1222                 if ( rc != LDAP_SUCCESS ) {
1223                         SlapReply rs = {REP_RESULT};
1224                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1225                                 "search base has changed" );
1226                         sprev->s_next = snext;
1227                         syncprov_drop_psearch( ss, 1 );
1228                         ss = sprev;
1229                         continue;
1230                 }
1231
1232
1233                 /* If we're sending results now, look for this op in old matches */
1234                 if ( !saveit ) {
1235                         syncmatches *old;
1236
1237                         /* Did we modify the search base? */
1238                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1239                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1240                                 ss->s_flags |= PS_WROTE_BASE;
1241                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1242                         }
1243
1244                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1245                                 old=sm, sm=sm->sm_next ) {
1246                                 if ( sm->sm_op == ss ) {
1247                                         found = 1;
1248                                         old->sm_next = sm->sm_next;
1249                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1250                                         break;
1251                                 }
1252                         }
1253                 }
1254
1255                 if ( fc.fscope ) {
1256                         op2 = *ss->s_op;
1257                         oh = *op->o_hdr;
1258                         oh.oh_conn = ss->s_op->o_conn;
1259                         oh.oh_connid = ss->s_op->o_connid;
1260                         op2.o_bd = op->o_bd->bd_self;
1261                         op2.o_hdr = &oh;
1262                         op2.o_extra = op->o_extra;
1263                         op2.o_callback = NULL;
1264                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1265                 }
1266
1267                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1268                         ss->s_sid, fc.fscope, rc );
1269
1270                 /* check if current o_req_dn is in scope and matches filter */
1271                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1272                         if ( saveit ) {
1273                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1274                                 sm->sm_next = opc->smatches;
1275                                 sm->sm_op = ss;
1276                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1277                                 ++ss->s_inuse;
1278                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1279                                 opc->smatches = sm;
1280                         } else {
1281                                 /* if found send UPDATE else send ADD */
1282                                 syncprov_qresp( opc, ss,
1283                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1284                         }
1285                 } else if ( !saveit && found ) {
1286                         /* send DELETE */
1287                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1288                 } else if ( !saveit ) {
1289                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1290                 }
1291                 if ( !saveit && found ) {
1292                         /* Decrement s_inuse, was incremented when called
1293                          * with saveit == TRUE
1294                          */
1295                         syncprov_free_syncop( ss );
1296                 }
1297         }
1298         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1299
1300         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1301                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1302                         op->o_bd = &db;
1303                 }
1304                 overlay_entry_release_ov( op, e, 0, on );
1305                 op->o_bd = b0;
1306         }
1307         if ( freefdn ) {
1308                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1309         }
1310         op->o_bd = b0;
1311 }
1312
1313 static int
1314 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1315 {
1316         slap_callback *cb = op->o_callback;
1317         opcookie *opc = cb->sc_private;
1318         slap_overinst *on = opc->son;
1319         syncprov_info_t         *si = on->on_bi.bi_private;
1320         syncmatches *sm, *snext;
1321         modtarget *mt, mtdummy;
1322
1323         for (sm = opc->smatches; sm; sm=snext) {
1324                 snext = sm->sm_next;
1325                 syncprov_free_syncop( sm->sm_op );
1326                 op->o_tmpfree( sm, op->o_tmpmemctx );
1327         }
1328
1329         /* Remove op from lock table */
1330         mt = opc->smt;
1331         if ( mt ) {
1332                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1333                 mt->mt_mods = mt->mt_mods->mi_next;
1334                 /* If there are more, promote the next one */
1335                 if ( mt->mt_mods ) {
1336                         mt->mt_op = mt->mt_mods->mi_op;
1337                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1338                 } else {
1339                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1340                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1341                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1342                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1343                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1344                         ch_free( mt );
1345                 }
1346         }
1347         if ( !BER_BVISNULL( &opc->suuid ))
1348                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1349         if ( !BER_BVISNULL( &opc->sndn ))
1350                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1351         if ( !BER_BVISNULL( &opc->sdn ))
1352                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1353         op->o_callback = cb->sc_next;
1354         op->o_tmpfree(cb, op->o_tmpmemctx);
1355
1356         return 0;
1357 }
1358
1359 static void
1360 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1361 {
1362         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1363         Modifications mod;
1364         Operation opm;
1365         SlapReply rsm = { 0 };
1366         slap_callback cb = {0};
1367         BackendDB be;
1368
1369 #ifdef CHECK_CSN
1370         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1371
1372         int i;
1373         for ( i=0; i<si->si_numcsns; i++ ) {
1374                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1375         }
1376 #endif
1377         mod.sml_numvals = si->si_numcsns;
1378         mod.sml_values = si->si_ctxcsn;
1379         mod.sml_nvalues = NULL;
1380         mod.sml_desc = slap_schema.si_ad_contextCSN;
1381         mod.sml_op = LDAP_MOD_REPLACE;
1382         mod.sml_flags = SLAP_MOD_INTERNAL;
1383         mod.sml_next = NULL;
1384
1385         cb.sc_response = slap_null_cb;
1386         opm = *op;
1387         opm.o_tag = LDAP_REQ_MODIFY;
1388         opm.o_callback = &cb;
1389         opm.orm_modlist = &mod;
1390         opm.orm_no_opattrs = 1;
1391         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1392                 be = *on->on_info->oi_origdb;
1393                 opm.o_bd = &be;
1394         }
1395         opm.o_req_dn = si->si_contextdn;
1396         opm.o_req_ndn = si->si_contextdn;
1397         opm.o_bd->bd_info = on->on_info->oi_orig;
1398         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1399         opm.o_no_schema_check = 1;
1400         opm.o_bd->be_modify( &opm, &rsm );
1401
1402         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1403                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1404                 const char      *text;
1405                 char txtbuf[SLAP_TEXT_BUFLEN];
1406                 size_t textlen = sizeof txtbuf;
1407                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1408                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1409                 opm.ora_e = e;
1410                 opm.o_bd->be_add( &opm, &rsm );
1411                 if ( e == opm.ora_e )
1412                         be_entry_release_w( &opm, opm.ora_e );
1413         }
1414
1415         if ( mod.sml_next != NULL ) {
1416                 slap_mods_free( mod.sml_next, 1 );
1417         }
1418 #ifdef CHECK_CSN
1419         for ( i=0; i<si->si_numcsns; i++ ) {
1420                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1421         }
1422 #endif
1423 }
1424
1425 static void
1426 syncprov_add_slog( Operation *op )
1427 {
1428         opcookie *opc = op->o_callback->sc_private;
1429         slap_overinst *on = opc->son;
1430         syncprov_info_t         *si = on->on_bi.bi_private;
1431         sessionlog *sl;
1432         slog_entry *se;
1433
1434         sl = si->si_logs;
1435         {
1436                 /* Allocate a record. UUIDs are not NUL-terminated. */
1437                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1438                         op->o_csn.bv_len + 1 );
1439                 se->se_next = NULL;
1440                 se->se_tag = op->o_tag;
1441
1442                 se->se_uuid.bv_val = (char *)(&se[1]);
1443                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1444                 se->se_uuid.bv_len = opc->suuid.bv_len;
1445
1446                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1447                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1448                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1449                 se->se_csn.bv_len = op->o_csn.bv_len;
1450                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1451
1452                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1453                 if ( sl->sl_head ) {
1454                         sl->sl_tail->se_next = se;
1455                 } else {
1456                         sl->sl_head = se;
1457                 }
1458                 sl->sl_tail = se;
1459                 sl->sl_num++;
1460                 while ( sl->sl_num > sl->sl_size ) {
1461                         se = sl->sl_head;
1462                         sl->sl_head = se->se_next;
1463                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1464                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1465                         ch_free( se );
1466                         sl->sl_num--;
1467                 }
1468                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1469         }
1470 }
1471
1472 /* Just set a flag if we found the matching entry */
1473 static int
1474 playlog_cb( Operation *op, SlapReply *rs )
1475 {
1476         if ( rs->sr_type == REP_SEARCH ) {
1477                 op->o_callback->sc_private = (void *)1;
1478         }
1479         return rs->sr_err;
1480 }
1481
1482 /* enter with sl->sl_mutex locked, release before returning */
1483 static void
1484 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1485         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1486 {
1487         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1488         slog_entry *se;
1489         int i, j, ndel, num, nmods, mmods;
1490         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1491         BerVarray uuids;
1492         struct berval delcsn[2];
1493
1494         if ( !sl->sl_num ) {
1495                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1496                 return;
1497         }
1498
1499         num = sl->sl_num;
1500         i = 0;
1501         nmods = 0;
1502
1503         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1504                 num * UUID_LEN, op->o_tmpmemctx );
1505         uuids[0].bv_val = (char *)(uuids + num + 1);
1506
1507         delcsn[0].bv_len = 0;
1508         delcsn[0].bv_val = cbuf;
1509         BER_BVZERO(&delcsn[1]);
1510
1511         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1512          * and everything else at the end. Do this first so we can
1513          * unlock the list mutex.
1514          */
1515         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1516                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1517         for ( se=sl->sl_head; se; se=se->se_next ) {
1518                 int k;
1519                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1520                 ndel = 1;
1521                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1522                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1523                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1524                                 break;
1525                         }
1526                 }
1527                 if ( ndel <= 0 ) {
1528                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1529                         continue;
1530                 }
1531                 ndel = 0;
1532                 for ( k=0; k<numcsns; k++ ) {
1533                         if ( se->se_sid == sids[k] ) {
1534                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1535                                 break;
1536                         }
1537                 }
1538                 if ( ndel > 0 ) {
1539                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1540                         break;
1541                 }
1542                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1543                         j = i;
1544                         i++;
1545                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1546                         delcsn[0].bv_len = se->se_csn.bv_len;
1547                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1548                 } else {
1549                         nmods++;
1550                         j = num - nmods;
1551                 }
1552                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1553                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1554                 uuids[j].bv_len = UUID_LEN;
1555         }
1556         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1557
1558         ndel = i;
1559
1560         /* Zero out unused slots */
1561         for ( i=ndel; i < num - nmods; i++ )
1562                 uuids[i].bv_len = 0;
1563
1564         /* Mods must be validated to see if they belong in this delete set.
1565          */
1566
1567         mmods = nmods;
1568         /* Strip any duplicates */
1569         for ( i=0; i<nmods; i++ ) {
1570                 for ( j=0; j<ndel; j++ ) {
1571                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1572                                 uuids[num - 1 - i].bv_len = 0;
1573                                 mmods --;
1574                                 break;
1575                         }
1576                 }
1577                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1578                 for ( j=0; j<i; j++ ) {
1579                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1580                                 uuids[num - 1 - i].bv_len = 0;
1581                                 mmods --;
1582                                 break;
1583                         }
1584                 }
1585         }
1586
1587         if ( mmods ) {
1588                 Operation fop;
1589                 SlapReply frs = { REP_RESULT };
1590                 int rc;
1591                 Filter mf, af;
1592                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1593                 slap_callback cb = {0};
1594
1595                 fop = *op;
1596
1597                 fop.o_sync_mode = 0;
1598                 fop.o_callback = &cb;
1599                 fop.ors_limit = NULL;
1600                 fop.ors_tlimit = SLAP_NO_LIMIT;
1601                 fop.ors_attrs = slap_anlist_all_attributes;
1602                 fop.ors_attrsonly = 0;
1603                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1604
1605                 af.f_choice = LDAP_FILTER_AND;
1606                 af.f_next = NULL;
1607                 af.f_and = &mf;
1608                 mf.f_choice = LDAP_FILTER_EQUALITY;
1609                 mf.f_ava = &eq;
1610                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1611                 mf.f_next = fop.ors_filter;
1612
1613                 fop.ors_filter = &af;
1614
1615                 cb.sc_response = playlog_cb;
1616                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1617
1618                 for ( i=ndel; i<num; i++ ) {
1619                         if ( uuids[i].bv_len == 0 ) continue;
1620
1621                         mf.f_av_value = uuids[i];
1622                         cb.sc_private = NULL;
1623                         fop.ors_slimit = 1;
1624                         frs.sr_nentries = 0;
1625                         rc = fop.o_bd->be_search( &fop, &frs );
1626
1627                         /* If entry was not found, add to delete list */
1628                         if ( !cb.sc_private ) {
1629                                 uuids[ndel++] = uuids[i];
1630                         }
1631                 }
1632                 fop.o_bd->bd_info = (BackendInfo *)on;
1633         }
1634         if ( ndel ) {
1635                 struct berval cookie;
1636
1637                 if ( delcsn[0].bv_len ) {
1638                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1639                                 slap_serverID ? slap_serverID : -1 );
1640
1641                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1642                 }
1643
1644                 uuids[ndel].bv_val = NULL;
1645                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1646                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1647                 if ( delcsn[0].bv_len ) {
1648                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1649                 }
1650         }
1651         op->o_tmpfree( uuids, op->o_tmpmemctx );
1652 }
1653
1654 static int
1655 syncprov_op_response( Operation *op, SlapReply *rs )
1656 {
1657         opcookie *opc = op->o_callback->sc_private;
1658         slap_overinst *on = opc->son;
1659         syncprov_info_t         *si = on->on_bi.bi_private;
1660         syncmatches *sm;
1661
1662         if ( rs->sr_err == LDAP_SUCCESS )
1663         {
1664                 struct berval maxcsn;
1665                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1666                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1667
1668                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1669
1670                 /* Update our context CSN */
1671                 cbuf[0] = '\0';
1672                 maxcsn.bv_val = cbuf;
1673                 maxcsn.bv_len = sizeof(cbuf);
1674                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1675
1676                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1677                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1678                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1679                         /* Catch contextCSN updates from syncrepl. We have to look at
1680                          * all the attribute values, as there may be more than one csn
1681                          * that changed, and only one can be passed in the csn queue.
1682                          */
1683                         Modifications *mod = op->orm_modlist;
1684                         int i, j, sid;
1685
1686                         for ( i=0; i<mod->sml_numvals; i++ ) {
1687                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1688
1689                                 for ( j=0; j<si->si_numcsns; j++ ) {
1690                                         if ( sid == si->si_sids[j] ) {
1691                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1692                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1693                                                         csn_changed = 1;
1694                                                 }
1695                                                 break;
1696                                         }
1697                                 }
1698
1699                                 if ( j == si->si_numcsns ) {
1700                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1701                                         si->si_numcsns++;
1702                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1703                                                 sizeof(int));
1704                                         si->si_sids[j] = sid;
1705                                         csn_changed = 1;
1706                                 }
1707                         }
1708                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1709
1710                         if ( csn_changed ) {
1711                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1712                                 have_psearches = ( si->si_ops != NULL );
1713                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1714
1715                                 if ( have_psearches ) {
1716                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1717                                                 if ( sm->sm_op->s_op->o_abandon )
1718                                                         continue;
1719                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1720                                         }
1721                                 }
1722                         }
1723                         goto leave;
1724                 }
1725
1726                 slap_get_commit_csn( op, &maxcsn, &foundit );
1727                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1728                         /* syncrepl queues the CSN values in the db where
1729                          * it is configured , not where the changes are made.
1730                          * So look for a value in the glue db if we didn't
1731                          * find any in this db.
1732                          */
1733                         BackendDB *be = op->o_bd;
1734                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1735                         maxcsn.bv_val = cbuf;
1736                         maxcsn.bv_len = sizeof(cbuf);
1737                         slap_get_commit_csn( op, &maxcsn, &foundit );
1738                         op->o_bd = be;
1739                 }
1740                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1741                         int i, sid;
1742 #ifdef CHECK_CSN
1743                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1744                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1745 #endif
1746                         sid = slap_parse_csn_sid( &maxcsn );
1747                         for ( i=0; i<si->si_numcsns; i++ ) {
1748                                 if ( sid == si->si_sids[i] ) {
1749                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1750                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1751                                                 csn_changed = 1;
1752                                         }
1753                                         break;
1754                                 }
1755                         }
1756                         /* It's a new SID for us */
1757                         if ( i == si->si_numcsns ) {
1758                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1759                                 csn_changed = 1;
1760                                 si->si_numcsns++;
1761                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1762                                         sizeof(int));
1763                                 si->si_sids[i] = sid;
1764                         }
1765 #if 0
1766                 } else if ( !foundit ) {
1767                         /* internal ops that aren't meant to be replicated */
1768                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1769                         return SLAP_CB_CONTINUE;
1770 #endif
1771                 }
1772
1773                 /* Don't do any processing for consumer contextCSN updates */
1774                 if ( op->o_dont_replicate ) {
1775                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1776                         goto leave;
1777                 }
1778
1779                 si->si_numops++;
1780                 if ( si->si_chkops || si->si_chktime ) {
1781                         /* Never checkpoint adding the context entry,
1782                          * it will deadlock
1783                          */
1784                         if ( op->o_tag != LDAP_REQ_ADD ||
1785                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1786                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1787                                         do_check = 1;
1788                                         si->si_numops = 0;
1789                                 }
1790                                 if ( si->si_chktime &&
1791                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1792                                         if ( si->si_chklast ) {
1793                                                 do_check = 1;
1794                                                 si->si_chklast = op->o_time;
1795                                         } else {
1796                                                 si->si_chklast = 1;
1797                                         }
1798                                 }
1799                         }
1800                 }
1801                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1802
1803                 if ( do_check ) {
1804                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1805                         syncprov_checkpoint( op, rs, on );
1806                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1807                 }
1808
1809                 /* only update consumer ctx if this is a newer csn */
1810                 if ( csn_changed ) {
1811                         opc->sctxcsn = maxcsn;
1812                 }
1813
1814                 /* Handle any persistent searches */
1815                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1816                 have_psearches = ( si->si_ops != NULL );
1817                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1818                 if ( have_psearches ) {
1819                         switch(op->o_tag) {
1820                         case LDAP_REQ_ADD:
1821                         case LDAP_REQ_MODIFY:
1822                         case LDAP_REQ_MODRDN:
1823                         case LDAP_REQ_EXTENDED:
1824                                 syncprov_matchops( op, opc, 0 );
1825                                 break;
1826                         case LDAP_REQ_DELETE:
1827                                 /* for each match in opc->smatches:
1828                                  *   send DELETE msg
1829                                  */
1830                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1831                                         if ( sm->sm_op->s_op->o_abandon )
1832                                                 continue;
1833                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1834                                 }
1835                                 break;
1836                         }
1837                 }
1838
1839                 /* Add any log records */
1840                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1841                         syncprov_add_slog( op );
1842                 }
1843 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1844         }
1845         return SLAP_CB_CONTINUE;
1846 }
1847
1848 /* We don't use a subentry to store the context CSN any more.
1849  * We expose the current context CSN as an operational attribute
1850  * of the suffix entry.
1851  */
1852 static int
1853 syncprov_op_compare( Operation *op, SlapReply *rs )
1854 {
1855         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1856         syncprov_info_t         *si = on->on_bi.bi_private;
1857         int rc = SLAP_CB_CONTINUE;
1858
1859         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1860                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1861         {
1862                 Entry e = {0};
1863                 Attribute a = {0};
1864
1865                 e.e_name = si->si_contextdn;
1866                 e.e_nname = si->si_contextdn;
1867                 e.e_attrs = &a;
1868
1869                 a.a_desc = slap_schema.si_ad_contextCSN;
1870
1871                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1872
1873                 a.a_vals = si->si_ctxcsn;
1874                 a.a_nvals = a.a_vals;
1875                 a.a_numvals = si->si_numcsns;
1876
1877                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1878                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1879                 if ( ! rs->sr_err ) {
1880                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1881                         goto return_results;
1882                 }
1883
1884                 if ( get_assert( op ) &&
1885                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1886                 {
1887                         rs->sr_err = LDAP_ASSERTION_FAILED;
1888                         goto return_results;
1889                 }
1890
1891
1892                 rs->sr_err = LDAP_COMPARE_FALSE;
1893
1894                 if ( attr_valfind( &a,
1895                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1896                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1897                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1898                 {
1899                         rs->sr_err = LDAP_COMPARE_TRUE;
1900                 }
1901
1902 return_results:;
1903
1904                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1905
1906                 send_ldap_result( op, rs );
1907
1908                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1909                         rs->sr_err = LDAP_SUCCESS;
1910                 }
1911                 rc = rs->sr_err;
1912         }
1913
1914         return rc;
1915 }
1916
1917 static int
1918 syncprov_op_mod( Operation *op, SlapReply *rs )
1919 {
1920         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1921         syncprov_info_t         *si = on->on_bi.bi_private;
1922         slap_callback *cb;
1923         opcookie *opc;
1924         int have_psearches, cbsize;
1925
1926         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1927         have_psearches = ( si->si_ops != NULL );
1928         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1929
1930         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1931                 (have_psearches ? sizeof(modinst) : 0 );
1932
1933         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1934         opc = (opcookie *)(cb+1);
1935         opc->son = on;
1936         cb->sc_response = syncprov_op_response;
1937         cb->sc_cleanup = syncprov_op_cleanup;
1938         cb->sc_private = opc;
1939         cb->sc_next = op->o_callback;
1940         op->o_callback = cb;
1941
1942         opc->osid = -1;
1943         opc->rsid = -1;
1944         if ( op->o_csn.bv_val ) {
1945                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1946         }
1947         if ( op->o_controls ) {
1948                 struct sync_cookie *scook =
1949                 op->o_controls[slap_cids.sc_LDAPsync];
1950                 if ( scook )
1951                         opc->rsid = scook->sid;
1952         }
1953
1954         /* If there are active persistent searches, lock this operation.
1955          * See seqmod.c for the locking logic on its own.
1956          */
1957         if ( have_psearches ) {
1958                 modtarget *mt, mtdummy;
1959                 modinst *mi;
1960
1961                 mi = (modinst *)(opc+1);
1962                 mi->mi_op = op;
1963
1964                 /* See if we're already modifying this entry... */
1965                 mtdummy.mt_op = op;
1966                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1967                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1968                 if ( mt ) {
1969                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1970                         if ( mt->mt_mods == NULL ) {
1971                                 /* Cannot reuse this mt, as another thread is about
1972                                  * to release it in syncprov_op_cleanup.
1973                                  */
1974                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1975                                 mt = NULL;
1976                         }
1977                 }
1978                 if ( mt ) {
1979                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1980                         mt->mt_tail->mi_next = mi;
1981                         mt->mt_tail = mi;
1982                         /* wait for this op to get to head of list */
1983                         while ( mt->mt_mods != mi ) {
1984                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1985                                 /* FIXME: if dynamic config can delete overlays or
1986                                  * databases we'll have to check for cleanup here.
1987                                  * Currently it's not an issue because there are
1988                                  * no dynamic config deletes...
1989                                  */
1990                                 if ( slapd_shutdown )
1991                                         return SLAPD_ABANDON;
1992
1993                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1994                                         ldap_pvt_thread_yield();
1995                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1996
1997                                 /* clean up if the caller is giving up */
1998                                 if ( op->o_abandon ) {
1999                                         modinst *m2;
2000                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2001                                                 m2 = m2->mi_next );
2002                                         m2->mi_next = mi->mi_next;
2003                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2004                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2005                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2006                                         return SLAPD_ABANDON;
2007                                 }
2008                         }
2009                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2010                 } else {
2011                         /* Record that we're modifying this entry now */
2012                         mt = ch_malloc( sizeof(modtarget) );
2013                         mt->mt_mods = mi;
2014                         mt->mt_tail = mi;
2015                         mt->mt_op = mi->mi_op;
2016                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2017                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2018                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2019                 }
2020                 opc->smt = mt;
2021         }
2022
2023         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2024                 syncprov_matchops( op, opc, 1 );
2025
2026         return SLAP_CB_CONTINUE;
2027 }
2028
2029 static int
2030 syncprov_op_extended( Operation *op, SlapReply *rs )
2031 {
2032         if ( exop_is_write( op ))
2033                 return syncprov_op_mod( op, rs );
2034
2035         return SLAP_CB_CONTINUE;
2036 }
2037
2038 typedef struct searchstate {
2039         slap_overinst *ss_on;
2040         syncops *ss_so;
2041         BerVarray ss_ctxcsn;
2042         int *ss_sids;
2043         int ss_numcsns;
2044 #define SS_PRESENT      0x01
2045 #define SS_CHANGED      0x02
2046         int ss_flags;
2047 } searchstate;
2048
2049 static int
2050 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2051 {
2052         if ( rs->sr_ctrls ) {
2053                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2054                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2055                 rs->sr_ctrls = NULL;
2056         }
2057         return 0;
2058 }
2059
2060 typedef struct SyncOperationBuffer {
2061         Operation               sob_op;
2062         Opheader                sob_hdr;
2063         OpExtra                 sob_oe;
2064         AttributeName   sob_extra;      /* not always present */
2065         /* Further data allocated here */
2066 } SyncOperationBuffer;
2067
2068 static void
2069 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2070 {
2071         SyncOperationBuffer *sopbuf2;
2072         Operation *op2;
2073         int i, alen = 0;
2074         size_t size;
2075         char *ptr;
2076         GroupAssertion *g1, *g2;
2077
2078         /* count the search attrs */
2079         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2080                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2081         }
2082         /* Make a new copy of the operation */
2083         size = offsetof( SyncOperationBuffer, sob_extra ) +
2084                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2085                 op->o_req_dn.bv_len + 1 +
2086                 op->o_req_ndn.bv_len + 1 +
2087                 op->o_ndn.bv_len + 1 +
2088                 so->s_filterstr.bv_len + 1;
2089         sopbuf2 = ch_calloc( 1, size );
2090         op2 = &sopbuf2->sob_op;
2091         op2->o_hdr = &sopbuf2->sob_hdr;
2092         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2093
2094         /* Copy the fields we care about explicitly, leave the rest alone */
2095         *op2->o_hdr = *op->o_hdr;
2096         op2->o_tag = op->o_tag;
2097         op2->o_time = op->o_time;
2098         op2->o_bd = on->on_info->oi_origdb;
2099         op2->o_request = op->o_request;
2100         op2->o_managedsait = op->o_managedsait;
2101         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2102         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2103
2104         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2105         if ( i ) {
2106                 op2->ors_attrs = (AttributeName *) ptr;
2107                 ptr = (char *) &op2->ors_attrs[i+1];
2108                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2109                         op2->ors_attrs[i] = op->ors_attrs[i];
2110                         op2->ors_attrs[i].an_name.bv_val = ptr;
2111                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2112                 }
2113                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2114         }
2115
2116         op2->o_authz = op->o_authz;
2117         op2->o_ndn.bv_val = ptr;
2118         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2119         op2->o_dn = op2->o_ndn;
2120         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2121         op2->o_req_dn.bv_val = ptr;
2122         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2123         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2124         op2->o_req_ndn.bv_val = ptr;
2125         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2126         op2->ors_filterstr.bv_val = ptr;
2127         strcpy( ptr, so->s_filterstr.bv_val );
2128         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2129
2130         /* Skip the AND/GE clause that we stuck on in front */
2131         if ( so->s_flags & PS_FIX_FILTER ) {
2132                 op2->ors_filter = op->ors_filter->f_and->f_next;
2133                 so->s_flags ^= PS_FIX_FILTER;
2134         } else {
2135                 op2->ors_filter = op->ors_filter;
2136         }
2137         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2138         so->s_op = op2;
2139
2140         /* Copy any cached group ACLs individually */
2141         op2->o_groups = NULL;
2142         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2143                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2144                 *g2 = *g1;
2145                 strcpy( g2->ga_ndn, g1->ga_ndn );
2146                 g2->ga_next = op2->o_groups;
2147                 op2->o_groups = g2;
2148         }
2149         /* Don't allow any further group caching */
2150         op2->o_do_not_cache = 1;
2151
2152         /* Add op2 to conn so abandon will find us */
2153         op->o_conn->c_n_ops_executing++;
2154         op->o_conn->c_n_ops_completed--;
2155         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2156         so->s_flags |= PS_IS_DETACHED;
2157
2158         /* Prevent anyone else from trying to send a result for this op */
2159         op->o_abandon = 1;
2160 }
2161
2162 static int
2163 syncprov_search_response( Operation *op, SlapReply *rs )
2164 {
2165         searchstate *ss = op->o_callback->sc_private;
2166         slap_overinst *on = ss->ss_on;
2167         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2168         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2169
2170         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2171                 Attribute *a;
2172                 /* If we got a referral without a referral object, there's
2173                  * something missing that we cannot replicate. Just ignore it.
2174                  * The consumer will abort because we didn't send the expected
2175                  * control.
2176                  */
2177                 if ( !rs->sr_entry ) {
2178                         assert( rs->sr_entry != NULL );
2179                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2180                         return SLAP_CB_CONTINUE;
2181                 }
2182                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2183                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2184                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2185                 }
2186                 if ( a ) {
2187                         int i, sid;
2188                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2189
2190                         /* Don't send changed entries back to the originator */
2191                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2192                                 Debug( LDAP_DEBUG_SYNC,
2193                                         "Entry %s changed by peer, ignored\n",
2194                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2195                                 return LDAP_SUCCESS;
2196                         }
2197
2198                         /* If not a persistent search */
2199                         if ( !ss->ss_so ) {
2200                                 /* Make sure entry is less than the snapshot'd contextCSN */
2201                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2202                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2203                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2204                                                 Debug( LDAP_DEBUG_SYNC,
2205                                                         "Entry %s CSN %s greater than snapshot %s\n",
2206                                                         rs->sr_entry->e_name.bv_val,
2207                                                         a->a_nvals[0].bv_val,
2208                                                         ss->ss_ctxcsn[i].bv_val );
2209                                                 return LDAP_SUCCESS;
2210                                         }
2211                                 }
2212                         }
2213
2214                         /* Don't send old entries twice */
2215                         if ( srs->sr_state.ctxcsn ) {
2216                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2217                                         if ( sid == srs->sr_state.sids[i] &&
2218                                                 ber_bvcmp( &a->a_nvals[0],
2219                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2220                                                 Debug( LDAP_DEBUG_SYNC,
2221                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2222                                                         rs->sr_entry->e_name.bv_val,
2223                                                         a->a_nvals[0].bv_val,
2224                                                         srs->sr_state.ctxcsn[i].bv_val );
2225                                                 return LDAP_SUCCESS;
2226                                         }
2227                                 }
2228                         }
2229                 }
2230                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2231                         op->o_tmpmemctx );
2232                 rs->sr_ctrls[1] = NULL;
2233                 /* If we're in delta-sync mode, always send a cookie */
2234                 if ( si->si_nopres && si->si_usehint && a ) {
2235                         struct berval cookie;
2236                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2237                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2238                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2239                 } else {
2240                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2241                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2242                 }
2243         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2244                 struct berval cookie = BER_BVNULL;
2245
2246                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2247                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2248                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2249                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2250
2251                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2252                 }
2253
2254                 /* Is this a regular refresh?
2255                  * Note: refresh never gets here if there were no changes
2256                  */
2257                 if ( !ss->ss_so ) {
2258                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2259                                 op->o_tmpmemctx );
2260                         rs->sr_ctrls[1] = NULL;
2261                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2262                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2263                                         LDAP_SYNC_REFRESH_DELETES );
2264                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2265                 } else {
2266                 /* It's RefreshAndPersist, transition to Persist phase */
2267                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2268                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2269                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2270                                 1, NULL, 0 );
2271                         if ( !BER_BVISNULL( &cookie ))
2272                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2273
2274                         /* Detach this Op from frontend control */
2275                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2276
2277                         /* But not if this connection was closed along the way */
2278                         if ( op->o_abandon ) {
2279                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2280                                 /* syncprov_ab_cleanup will free this syncop */
2281                                 return SLAPD_ABANDON;
2282
2283                         } else {
2284                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2285                                 /* Turn off the refreshing flag */
2286                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2287
2288                                 syncprov_detach_op( op, ss->ss_so, on );
2289
2290                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2291
2292                                 /* If there are queued responses, fire them off */
2293                                 if ( ss->ss_so->s_res )
2294                                         syncprov_qstart( ss->ss_so );
2295                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2296                         }
2297
2298                         return LDAP_SUCCESS;
2299                 }
2300         }
2301
2302         return SLAP_CB_CONTINUE;
2303 }
2304
2305 static int
2306 syncprov_op_search( Operation *op, SlapReply *rs )
2307 {
2308         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2309         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2310         slap_callback   *cb;
2311         int gotstate = 0, changed = 0, do_present = 0;
2312         syncops *sop = NULL;
2313         searchstate *ss;
2314         sync_control *srs;
2315         BerVarray ctxcsn;
2316         int i, *sids, numcsns;
2317         struct berval mincsn;
2318
2319         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2320
2321         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2322                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2323                 return rs->sr_err;
2324         }
2325
2326         srs = op->o_controls[slap_cids.sc_LDAPsync];
2327
2328         /* If this is a persistent search, set it up right away */
2329         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2330                 syncops so = {0};
2331                 fbase_cookie fc;
2332                 opcookie opc;
2333                 slap_callback sc;
2334
2335                 fc.fss = &so;
2336                 fc.fbase = 0;
2337                 so.s_eid = NOID;
2338                 so.s_op = op;
2339                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2340                 /* syncprov_findbase expects to be called as a callback... */
2341                 sc.sc_private = &opc;
2342                 opc.son = on;
2343                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2344                 cb = op->o_callback;
2345                 op->o_callback = &sc;
2346                 rs->sr_err = syncprov_findbase( op, &fc );
2347                 op->o_callback = cb;
2348                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2349
2350                 if ( rs->sr_err != LDAP_SUCCESS ) {
2351                         send_ldap_result( op, rs );
2352                         return rs->sr_err;
2353                 }
2354                 sop = ch_malloc( sizeof( syncops ));
2355                 *sop = so;
2356                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2357                 sop->s_rid = srs->sr_state.rid;
2358                 sop->s_sid = srs->sr_state.sid;
2359                 sop->s_inuse = 1;
2360
2361                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2362                 sop->s_next = si->si_ops;
2363                 si->si_ops = sop;
2364                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2365         }
2366
2367         /* snapshot the ctxcsn */
2368         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2369         numcsns = si->si_numcsns;
2370         if ( numcsns ) {
2371                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2372                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2373                 for ( i=0; i<numcsns; i++ )
2374                         sids[i] = si->si_sids[i];
2375         } else {
2376                 ctxcsn = NULL;
2377                 sids = NULL;
2378         }
2379         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2380
2381         /* If we have a cookie, handle the PRESENT lookups */
2382         if ( srs->sr_state.ctxcsn ) {
2383                 sessionlog *sl;
2384                 int i, j;
2385
2386                 /* If we don't have any CSN of our own yet, pretend nothing
2387                  * has changed.
2388                  */
2389                 if ( !numcsns )
2390                         goto no_change;
2391
2392                 if ( !si->si_nopres )
2393                         do_present = SS_PRESENT;
2394
2395                 /* If there are SIDs we don't recognize in the cookie, drop them */
2396                 for (i=0; i<srs->sr_state.numcsns; ) {
2397                         for (j=0; j<numcsns; j++) {
2398                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2399                                         break;
2400                                 }
2401                         }
2402                         /* not found */
2403                         if ( j == numcsns ) {
2404                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2405                                 j = srs->sr_state.numcsns - 1;
2406                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2407                                 tmp.bv_len = 0;
2408                                 srs->sr_state.ctxcsn[j] = tmp;
2409                                 srs->sr_state.numcsns = j;
2410                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2411                                 continue;
2412                         }
2413                         i++;
2414                 }
2415
2416                 /* Find the smallest CSN */
2417                 mincsn = srs->sr_state.ctxcsn[0];
2418                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2419                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2420                                 mincsn = srs->sr_state.ctxcsn[i];
2421                 }
2422
2423                 /* If nothing has changed, shortcut it */
2424                 if ( srs->sr_state.numcsns == numcsns ) {
2425                         int i, j, newer;
2426                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2427                                 for ( j=0; j<numcsns; j++ ) {
2428                                         if ( srs->sr_state.sids[i] != sids[j] )
2429                                                 continue;
2430                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2431                                         /* If our state is newer, tell consumer about changes */
2432                                         if ( newer < 0 )
2433                                                 changed = SS_CHANGED;
2434                                         else if ( newer > 0 ) {
2435                                         /* our state is older, tell consumer nothing */
2436                                                 if ( sop ) {
2437                                                         syncops **sp = &si->si_ops;
2438
2439                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2440                                                         while ( *sp != sop )
2441                                                                 sp = &(*sp)->s_next;
2442                                                         *sp = sop->s_next;
2443                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2444                                                         ch_free( sop );
2445                                                 }
2446                                                 rs->sr_err = LDAP_SUCCESS;
2447                                                 rs->sr_ctrls = NULL;
2448                                                 send_ldap_result( op, rs );
2449                                                 return rs->sr_err;
2450                                         }
2451                                         break;
2452                                 }
2453                                 if ( changed )
2454                                         break;
2455                         }
2456                         if ( !changed ) {
2457                                 do_present = 0;
2458 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2459                                         LDAPControl     *ctrls[2];
2460
2461                                         ctrls[0] = NULL;
2462                                         ctrls[1] = NULL;
2463                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2464                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2465                                         rs->sr_ctrls = ctrls;
2466                                         rs->sr_err = LDAP_SUCCESS;
2467                                         send_ldap_result( op, rs );
2468                                         rs->sr_ctrls = NULL;
2469                                         return rs->sr_err;
2470                                 }
2471                                 goto shortcut;
2472                         }
2473                 } else {
2474                         /* consumer doesn't have the right number of CSNs */
2475                         changed = SS_CHANGED;
2476                 }
2477                 /* Do we have a sessionlog for this search? */
2478                 sl=si->si_logs;
2479                 if ( sl ) {
2480                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2481                         /* Are there any log entries, and is the consumer state
2482                          * present in the session log?
2483                          */
2484                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2485                                 do_present = 0;
2486                                 /* mutex is unlocked in playlog */
2487                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2488                         } else {
2489                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2490                         }
2491                 }
2492                 /* Is the CSN still present in the database? */
2493                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2494                         /* No, so a reload is required */
2495                         /* the 2.2 consumer doesn't send this hint */
2496                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2497                                 if ( ctxcsn )
2498                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2499                                 if ( sids )
2500                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2501                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2502                                 return rs->sr_err;
2503                         }
2504                         if ( srs->sr_state.ctxcsn ) {
2505                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2506                                 srs->sr_state.ctxcsn = NULL;
2507                         }
2508                         if ( srs->sr_state.sids ) {
2509                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2510                                 srs->sr_state.sids = NULL;
2511                         }
2512                         srs->sr_state.numcsns = 0;
2513                 } else {
2514                         gotstate = 1;
2515                         /* If changed and doing Present lookup, send Present UUIDs */
2516                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2517                                 LDAP_SUCCESS ) {
2518                                 if ( ctxcsn )
2519                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2520                                 if ( sids )
2521                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2522                                 send_ldap_result( op, rs );
2523                                 return rs->sr_err;
2524                         }
2525                 }
2526         } else {
2527                 /* No consumer state, assume something has changed */
2528                 changed = SS_CHANGED;
2529         }
2530
2531 shortcut:
2532         /* Append CSN range to search filter, save original filter
2533          * for persistent search evaluation
2534          */
2535         if ( sop ) {
2536                 sop->s_filterstr= op->ors_filterstr;
2537         }
2538
2539         /* If something changed, find the changes */
2540         if ( gotstate && changed ) {
2541                 Filter *fand, *fava;
2542
2543                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2544                 fand->f_choice = LDAP_FILTER_AND;
2545                 fand->f_next = NULL;
2546                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2547                 fand->f_and = fava;
2548                 fava->f_choice = LDAP_FILTER_GE;
2549                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2550                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2551 #ifdef LDAP_COMP_MATCH
2552                 fava->f_ava->aa_cf = NULL;
2553 #endif
2554                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2555                 fava->f_next = op->ors_filter;
2556                 op->ors_filter = fand;
2557                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2558                 if ( sop )
2559                         sop->s_flags |= PS_FIX_FILTER;
2560         }
2561
2562         /* Let our callback add needed info to returned entries */
2563         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2564         ss = (searchstate *)(cb+1);
2565         ss->ss_on = on;
2566         ss->ss_so = sop;
2567         ss->ss_flags = do_present | changed;
2568         ss->ss_ctxcsn = ctxcsn;
2569         ss->ss_numcsns = numcsns;
2570         ss->ss_sids = sids;
2571         cb->sc_response = syncprov_search_response;
2572         cb->sc_cleanup = syncprov_search_cleanup;
2573         cb->sc_private = ss;
2574         cb->sc_next = op->o_callback;
2575         op->o_callback = cb;
2576
2577         /* If this is a persistent search and no changes were reported during
2578          * the refresh phase, just invoke the response callback to transition
2579          * us into persist phase
2580          */
2581         if ( !changed ) {
2582                 rs->sr_err = LDAP_SUCCESS;
2583                 rs->sr_nentries = 0;
2584                 send_ldap_result( op, rs );
2585                 return rs->sr_err;
2586         }
2587         return SLAP_CB_CONTINUE;
2588 }
2589
2590 static int
2591 syncprov_operational(
2592         Operation *op,
2593         SlapReply *rs )
2594 {
2595         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2596         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2597
2598         /* This prevents generating unnecessarily; frontend will strip
2599          * any statically stored copy.
2600          */
2601         if ( op->o_sync != SLAP_CONTROL_NONE )
2602                 return SLAP_CB_CONTINUE;
2603
2604         if ( rs->sr_entry &&
2605                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2606
2607                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2608                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2609                         Attribute *a, **ap = NULL;
2610
2611                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2612                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2613                                         break;
2614                         }
2615
2616                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2617                         if ( si->si_ctxcsn ) {
2618                                 if ( !a ) {
2619                                         for ( ap = &rs->sr_operational_attrs; *ap;
2620                                                 ap=&(*ap)->a_next );
2621
2622                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2623                                         *ap = a;
2624                                 }
2625
2626                                 if ( !ap ) {
2627                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2628                                                 Entry *e = entry_dup( rs->sr_entry );
2629                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2630                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2631                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2632                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2633                                                         entry_free( rs->sr_entry );
2634                                                 }
2635                                                 rs->sr_entry = e;
2636                                                 rs->sr_flags |=
2637                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2638                                                 a = attr_find( rs->sr_entry->e_attrs,
2639                                                         slap_schema.si_ad_contextCSN );
2640                                         }
2641                                         if ( a->a_nvals != a->a_vals ) {
2642                                                 ber_bvarray_free( a->a_nvals );
2643                                         }
2644                                         a->a_nvals = NULL;
2645                                         ber_bvarray_free( a->a_vals );
2646                                         a->a_vals = NULL;
2647                                         a->a_numvals = 0;
2648                                 }
2649                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2650                         }
2651                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2652                 }
2653         }
2654         return SLAP_CB_CONTINUE;
2655 }
2656
2657 enum {
2658         SP_CHKPT = 1,
2659         SP_SESSL,
2660         SP_NOPRES,
2661         SP_USEHINT
2662 };
2663
2664 static ConfigDriver sp_cf_gen;
2665
2666 static ConfigTable spcfg[] = {
2667         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2668                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2669                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2670                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2671         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2672                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2673                         "DESC 'Session log size in ops' "
2674                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2675         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2676                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2677                         "DESC 'Omit Present phase processing' "
2678                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2679         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2680                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2681                         "DESC 'Observe Reload Hint in Request control' "
2682                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2683         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2684 };
2685
2686 static ConfigOCs spocs[] = {
2687         { "( OLcfgOvOc:1.1 "
2688                 "NAME 'olcSyncProvConfig' "
2689                 "DESC 'SyncRepl Provider configuration' "
2690                 "SUP olcOverlayConfig "
2691                 "MAY ( olcSpCheckpoint "
2692                         "$ olcSpSessionlog "
2693                         "$ olcSpNoPresent "
2694                         "$ olcSpReloadHint "
2695                 ") )",
2696                         Cft_Overlay, spcfg },
2697         { NULL, 0, NULL }
2698 };
2699
2700 static int
2701 sp_cf_gen(ConfigArgs *c)
2702 {
2703         slap_overinst           *on = (slap_overinst *)c->bi;
2704         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2705         int rc = 0;
2706
2707         if ( c->op == SLAP_CONFIG_EMIT ) {
2708                 switch ( c->type ) {
2709                 case SP_CHKPT:
2710                         if ( si->si_chkops || si->si_chktime ) {
2711                                 struct berval bv;
2712                                 /* we assume si_chktime is a multiple of 60
2713                                  * because the parsed value was originally
2714                                  * multiplied by 60 */
2715                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2716                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2717                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2718                                         rc = 1;
2719                                 } else {
2720                                         bv.bv_val = c->cr_msg;
2721                                         value_add_one( &c->rvalue_vals, &bv );
2722                                 }
2723                         } else {
2724                                 rc = 1;
2725                         }
2726                         break;
2727                 case SP_SESSL:
2728                         if ( si->si_logs ) {
2729                                 c->value_int = si->si_logs->sl_size;
2730                         } else {
2731                                 rc = 1;
2732                         }
2733                         break;
2734                 case SP_NOPRES:
2735                         if ( si->si_nopres ) {
2736                                 c->value_int = 1;
2737                         } else {
2738                                 rc = 1;
2739                         }
2740                         break;
2741                 case SP_USEHINT:
2742                         if ( si->si_usehint ) {
2743                                 c->value_int = 1;
2744                         } else {
2745                                 rc = 1;
2746                         }
2747                         break;
2748                 }
2749                 return rc;
2750         } else if ( c->op == LDAP_MOD_DELETE ) {
2751                 switch ( c->type ) {
2752                 case SP_CHKPT:
2753                         si->si_chkops = 0;
2754                         si->si_chktime = 0;
2755                         break;
2756                 case SP_SESSL:
2757                         if ( si->si_logs )
2758                                 si->si_logs->sl_size = 0;
2759                         else
2760                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2761                         break;
2762                 case SP_NOPRES:
2763                         if ( si->si_nopres )
2764                                 si->si_nopres = 0;
2765                         else
2766                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2767                         break;
2768                 case SP_USEHINT:
2769                         if ( si->si_usehint )
2770                                 si->si_usehint = 0;
2771                         else
2772                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2773                         break;
2774                 }
2775                 return rc;
2776         }
2777         switch ( c->type ) {
2778         case SP_CHKPT:
2779                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2780                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2781                                 c->argv[0], c->argv[1] );
2782                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2783                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2784                         return ARG_BAD_CONF;
2785                 }
2786                 if ( si->si_chkops <= 0 ) {
2787                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2788                                 c->argv[0], si->si_chkops );
2789                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2790                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2791                         return ARG_BAD_CONF;
2792                 }
2793                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2794                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2795                                 c->argv[0], c->argv[1] );
2796                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2797                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2798                         return ARG_BAD_CONF;
2799                 }
2800                 if ( si->si_chktime <= 0 ) {
2801                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2802                                 c->argv[0], si->si_chkops );
2803                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2804                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2805                         return ARG_BAD_CONF;
2806                 }
2807                 si->si_chktime *= 60;
2808                 break;
2809         case SP_SESSL: {
2810                 sessionlog *sl;
2811                 int size = c->value_int;
2812
2813                 if ( size < 0 ) {
2814                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2815                                 c->argv[0], size );
2816                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2817                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2818                         return ARG_BAD_CONF;
2819                 }
2820                 sl = si->si_logs;
2821                 if ( !sl ) {
2822                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2823                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2824                         sl->sl_mincsn.bv_len = 0;
2825                         sl->sl_num = 0;
2826                         sl->sl_head = sl->sl_tail = NULL;
2827                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2828                         si->si_logs = sl;
2829                 }
2830                 sl->sl_size = size;
2831                 }
2832                 break;
2833         case SP_NOPRES:
2834                 si->si_nopres = c->value_int;
2835                 break;
2836         case SP_USEHINT:
2837                 si->si_usehint = c->value_int;
2838                 break;
2839         }
2840         return rc;
2841 }
2842
2843 /* ITS#3456 we cannot run this search on the main thread, must use a
2844  * child thread in order to insure we have a big enough stack.
2845  */
2846 static void *
2847 syncprov_db_otask(
2848         void *ptr
2849 )
2850 {
2851         syncprov_findcsn( ptr, FIND_MAXCSN );
2852         return NULL;
2853 }
2854
2855 /* Read any existing contextCSN from the underlying db.
2856  * Then search for any entries newer than that. If no value exists,
2857  * just generate it. Cache whatever result.
2858  */
2859 static int
2860 syncprov_db_open(
2861         BackendDB *be,
2862         ConfigReply *cr
2863 )
2864 {
2865         slap_overinst   *on = (slap_overinst *) be->bd_info;
2866         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2867
2868         Connection conn = { 0 };
2869         OperationBuffer opbuf;
2870         Operation *op;
2871         Entry *e = NULL;
2872         Attribute *a;
2873         int rc;
2874         void *thrctx = NULL;
2875
2876         if ( !SLAP_LASTMOD( be )) {
2877                 Debug( LDAP_DEBUG_ANY,
2878                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2879                 return -1;
2880         }
2881
2882         if ( slapMode & SLAP_TOOL_MODE ) {
2883                 return 0;
2884         }
2885
2886         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2887         if ( rc ) {
2888                 return rc;
2889         }
2890
2891         thrctx = ldap_pvt_thread_pool_context();
2892         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2893         op = &opbuf.ob_op;
2894         op->o_bd = be;
2895         op->o_dn = be->be_rootdn;
2896         op->o_ndn = be->be_rootndn;
2897
2898         if ( SLAP_SYNC_SUBENTRY( be )) {
2899                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2900                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2901         } else {
2902                 si->si_contextdn = be->be_nsuffix[0];
2903         }
2904         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2905                 slap_schema.si_ad_contextCSN, 0, &e, on );
2906
2907         if ( e ) {
2908                 ldap_pvt_thread_t tid;
2909
2910                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2911                 if ( a ) {
2912                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2913                         si->si_numcsns = a->a_numvals;
2914                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2915                 }
2916                 overlay_entry_release_ov( op, e, 0, on );
2917                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2918                         op->o_req_dn = be->be_suffix[0];
2919                         op->o_req_ndn = be->be_nsuffix[0];
2920                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2921                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2922                         ldap_pvt_thread_join( tid, NULL );
2923                 }
2924         }
2925
2926         /* Didn't find a contextCSN, should we generate one? */
2927         if ( !si->si_ctxcsn ) {
2928                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2929                 struct berval csn;
2930
2931                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2932                 /* If we're also a consumer, then don't generate anything.
2933                  * Wait for our provider to send it to us, or for a local
2934                  * modify if we have multimaster.
2935                  */
2936                         goto out;
2937                 }
2938                 csn.bv_val = csnbuf;
2939                 csn.bv_len = sizeof( csnbuf );
2940                 slap_get_csn( op, &csn, 0 );
2941                 value_add_one( &si->si_ctxcsn, &csn );
2942                 si->si_numcsns = 1;
2943                 si->si_sids = ch_malloc( sizeof(int) );
2944                 si->si_sids[0] = slap_serverID;
2945
2946                 /* make sure we do a checkpoint on close */
2947                 si->si_numops++;
2948         }
2949
2950 out:
2951         op->o_bd->bd_info = (BackendInfo *)on;
2952         return 0;
2953 }
2954
2955 /* Write the current contextCSN into the underlying db.
2956  */
2957 static int
2958 syncprov_db_close(
2959         BackendDB *be,
2960         ConfigReply *cr
2961 )
2962 {
2963     slap_overinst   *on = (slap_overinst *) be->bd_info;
2964     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2965
2966         if ( slapMode & SLAP_TOOL_MODE ) {
2967                 return 0;
2968         }
2969         if ( si->si_numops ) {
2970                 Connection conn = {0};
2971                 OperationBuffer opbuf;
2972                 Operation *op;
2973                 SlapReply rs = {REP_RESULT};
2974                 void *thrctx;
2975
2976                 thrctx = ldap_pvt_thread_pool_context();
2977                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2978                 op = &opbuf.ob_op;
2979                 op->o_bd = be;
2980                 op->o_dn = be->be_rootdn;
2981                 op->o_ndn = be->be_rootndn;
2982                 syncprov_checkpoint( op, &rs, on );
2983         }
2984
2985     return 0;
2986 }
2987
2988 static int
2989 syncprov_db_init(
2990         BackendDB *be,
2991         ConfigReply *cr
2992 )
2993 {
2994         slap_overinst   *on = (slap_overinst *)be->bd_info;
2995         syncprov_info_t *si;
2996
2997         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2998                 Debug( LDAP_DEBUG_ANY,
2999                         "syncprov must be instantiated within a database.\n",
3000                         0, 0, 0 );
3001                 return 1;
3002         }
3003
3004         si = ch_calloc(1, sizeof(syncprov_info_t));
3005         on->on_bi.bi_private = si;
3006         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3007         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3008         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3009         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3010
3011         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3012         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3013         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3014         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3015
3016         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3017         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3018
3019         return 0;
3020 }
3021
3022 static int
3023 syncprov_db_destroy(
3024         BackendDB *be,
3025         ConfigReply *cr
3026 )
3027 {
3028         slap_overinst   *on = (slap_overinst *)be->bd_info;
3029         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3030
3031         if ( si ) {
3032                 if ( si->si_logs ) {
3033                         slog_entry *se = si->si_logs->sl_head;
3034
3035                         while ( se ) {
3036                                 slog_entry *se_next = se->se_next;
3037                                 ch_free( se );
3038                                 se = se_next;
3039                         }
3040
3041                         ch_free( si->si_logs );
3042                 }
3043                 if ( si->si_ctxcsn )
3044                         ber_bvarray_free( si->si_ctxcsn );
3045                 if ( si->si_sids )
3046                         ch_free( si->si_sids );
3047                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3048                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3049                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3050                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3051                 ch_free( si );
3052         }
3053
3054         return 0;
3055 }
3056
3057 static int syncprov_parseCtrl (
3058         Operation *op,
3059         SlapReply *rs,
3060         LDAPControl *ctrl )
3061 {
3062         ber_tag_t tag;
3063         BerElementBuffer berbuf;
3064         BerElement *ber = (BerElement *)&berbuf;
3065         ber_int_t mode;
3066         ber_len_t len;
3067         struct berval cookie = BER_BVNULL;
3068         sync_control *sr;
3069         int rhint = 0;
3070
3071         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3072                 rs->sr_text = "Sync control specified multiple times";
3073                 return LDAP_PROTOCOL_ERROR;
3074         }
3075
3076         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3077                 rs->sr_text = "Sync control specified with pagedResults control";
3078                 return LDAP_PROTOCOL_ERROR;
3079         }
3080
3081         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3082                 rs->sr_text = "Sync control value is absent";
3083                 return LDAP_PROTOCOL_ERROR;
3084         }
3085
3086         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3087                 rs->sr_text = "Sync control value is empty";
3088                 return LDAP_PROTOCOL_ERROR;
3089         }
3090
3091         /* Parse the control value
3092          *      syncRequestValue ::= SEQUENCE {
3093          *              mode   ENUMERATED {
3094          *                      -- 0 unused
3095          *                      refreshOnly             (1),
3096          *                      -- 2 reserved
3097          *                      refreshAndPersist       (3)
3098          *              },
3099          *              cookie  syncCookie OPTIONAL
3100          *      }
3101          */
3102
3103         ber_init2( ber, &ctrl->ldctl_value, 0 );
3104
3105         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3106                 rs->sr_text = "Sync control : mode decoding error";
3107                 return LDAP_PROTOCOL_ERROR;
3108         }
3109
3110         switch( mode ) {
3111         case LDAP_SYNC_REFRESH_ONLY:
3112                 mode = SLAP_SYNC_REFRESH;
3113                 break;
3114         case LDAP_SYNC_REFRESH_AND_PERSIST:
3115                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3116                 break;
3117         default:
3118                 rs->sr_text = "Sync control : unknown update mode";
3119                 return LDAP_PROTOCOL_ERROR;
3120         }
3121
3122         tag = ber_peek_tag( ber, &len );
3123
3124         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3125                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3126                         rs->sr_text = "Sync control : cookie decoding error";
3127                         return LDAP_PROTOCOL_ERROR;
3128                 }
3129                 tag = ber_peek_tag( ber, &len );
3130         }
3131         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3132                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3133                         rs->sr_text = "Sync control : rhint decoding error";
3134                         return LDAP_PROTOCOL_ERROR;
3135                 }
3136         }
3137         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3138                         rs->sr_text = "Sync control : decoding error";
3139                         return LDAP_PROTOCOL_ERROR;
3140         }
3141         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3142         sr->sr_rhint = rhint;
3143         if (!BER_BVISNULL(&cookie)) {
3144                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3145                 /* If parse fails, pretend no cookie was sent */
3146                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3147                         sr->sr_state.rid == -1 ) {
3148                         if ( sr->sr_state.ctxcsn ) {
3149                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3150                                 sr->sr_state.ctxcsn = NULL;
3151                         }
3152                         sr->sr_state.numcsns = 0;
3153                 }
3154         }
3155
3156         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3157
3158         op->o_sync = ctrl->ldctl_iscritical
3159                 ? SLAP_CONTROL_CRITICAL
3160                 : SLAP_CONTROL_NONCRITICAL;
3161
3162         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3163
3164         return LDAP_SUCCESS;
3165 }
3166
3167 /* This overlay is set up for dynamic loading via moduleload. For static
3168  * configuration, you'll need to arrange for the slap_overinst to be
3169  * initialized and registered by some other function inside slapd.
3170  */
3171
3172 static slap_overinst            syncprov;
3173
3174 int
3175 syncprov_initialize()
3176 {
3177         int rc;
3178
3179         rc = register_supported_control( LDAP_CONTROL_SYNC,
3180                 SLAP_CTRL_SEARCH, NULL,
3181                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3182         if ( rc != LDAP_SUCCESS ) {
3183                 Debug( LDAP_DEBUG_ANY,
3184                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3185                 return rc;
3186         }
3187
3188         syncprov.on_bi.bi_type = "syncprov";
3189         syncprov.on_bi.bi_db_init = syncprov_db_init;
3190         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3191         syncprov.on_bi.bi_db_open = syncprov_db_open;
3192         syncprov.on_bi.bi_db_close = syncprov_db_close;
3193
3194         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3195         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3196
3197         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3198         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3199         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3200         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3201         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3202         syncprov.on_bi.bi_op_search = syncprov_op_search;
3203         syncprov.on_bi.bi_extended = syncprov_op_extended;
3204         syncprov.on_bi.bi_operational = syncprov_operational;
3205
3206         syncprov.on_bi.bi_cf_ocs = spocs;
3207
3208         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3209
3210         rc = config_register_schema( spcfg, spocs );
3211         if ( rc ) return rc;
3212
3213         return overlay_register( &syncprov );
3214 }
3215
3216 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3217 int
3218 init_module( int argc, char *argv[] )
3219 {
3220         return syncprov_initialize();
3221 }
3222 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3223
3224 #endif /* defined(SLAPD_OVER_SYNCPROV) */