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                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 859                 rs.sr_ctrls = NULL;
 860         }
 861
 862         return rs.sr_err;
 863 }
 864
 865 static void
 866 syncprov_qstart( syncops *so );
 867
 868 /* Play back queued responses */
 869 static int
 870 syncprov_qplay( Operation *op, syncops *so )
 871 {
 872         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 873         syncres *sr;
 874         Entry *e;
 875         opcookie opc;
 876         int rc = 0;
 877
 878         opc.son = on;
 879
 880         do {
 881                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 882                 sr = so->s_res;
 883                 if ( sr )
 884                         so->s_res = sr->s_next;
 885                 if ( !so->s_res )
 886                         so->s_restail = NULL;
 887                 /* Exit loop with mutex held */
 888                 if ( !sr || so->s_op->o_abandon )
 889                         break;
 890                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 891
 892                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 893                     SlapReply rs = { REP_INTERMEDIATE };
 894
 895                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 896                                 &sr->s_csn, 0, NULL, 0 );
 897                 } else {
 898                         opc.sdn = sr->s_dn;
 899                         opc.sndn = sr->s_ndn;
 900                         opc.suuid = sr->s_uuid;
 901                         opc.sctxcsn = sr->s_csn;
 902                         opc.sreference = sr->s_isreference;
 903                         e = NULL;
 904
 905                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 906                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 907                                 if ( rc ) {
 908                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 909                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 910                                         ch_free( sr );
 911                                         rc = 0;
 912                                         continue;
 913                                 }
 914                         }
 915                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 916
 917                         if ( e ) {
 918                                 overlay_entry_release_ov( op, e, 0, on );
 919                         }
 920                 }
 921
 922                 ch_free( sr );
 923
 924                 /* Exit loop with mutex held */
 925                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926
 927         } while (0);
 928
 929         /* We now only send one change at a time, to prevent one
 930          * psearch from hogging all the CPU. Resubmit this task if
 931          * there are more responses queued and no errors occurred.
 932          */
 933
 934         if ( rc == 0 && so->s_res ) {
 935                 syncprov_qstart( so );
 936         } else {
 937                 so->s_flags ^= PS_TASK_QUEUED;
 938         }
 939
 940         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 941         return rc;
 942 }
 943
 944 /* task for playing back queued responses */
 945 static void *
 946 syncprov_qtask( void *ctx, void *arg )
 947 {
 948         syncops *so = arg;
 949         OperationBuffer opbuf;
 950         Operation *op;
 951         BackendDB be;
 952         int rc;
 953
 954         op = &opbuf.ob_op;
 955         *op = *so->s_op;
 956         op->o_hdr = &opbuf.ob_hdr;
 957         op->o_controls = opbuf.ob_controls;
 958         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 959
 960         *op->o_hdr = *so->s_op->o_hdr;
 961
 962         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 963         op->o_tmpmfuncs = &slap_sl_mfuncs;
 964         op->o_threadctx = ctx;
 965
 966         /* syncprov_qplay expects a fake db */
 967         be = *so->s_op->o_bd;
 968         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 969         op->o_bd = &be;
 970         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 971         op->o_callback = NULL;
 972
 973         rc = syncprov_qplay( op, so );
 974
 975         /* decrement use count... */
 976         syncprov_free_syncop( so );
 977
 978         return NULL;
 979 }
 980
 981 /* Start the task to play back queued psearch responses */
 982 static void
 983 syncprov_qstart( syncops *so )
 984 {
 985         so->s_flags |= PS_TASK_QUEUED;
 986         so->s_inuse++;
 987         ldap_pvt_thread_pool_submit( &connection_pool,
 988                 syncprov_qtask, so );
 989 }
 990
 991 /* Queue a persistent search response */
 992 static int
 993 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 994 {
 995         syncres *sr;
 996         int srsize;
 997         struct berval cookie = opc->sctxcsn;
 998
 999         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1000                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1001
1002                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1003                         so->s_rid, slap_serverID ? slap_serverID : -1);
1004         }
1005
1006         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1007                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1008         if ( cookie.bv_len )
1009                 srsize += cookie.bv_len + 1;
1010         sr = ch_malloc( srsize );
1011         sr->s_next = NULL;
1012         sr->s_dn.bv_val = (char *)(sr + 1);
1013         sr->s_dn.bv_len = opc->sdn.bv_len;
1014         sr->s_mode = mode;
1015         sr->s_isreference = opc->sreference;
1016         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1017                  opc->sdn.bv_val ) + 1;
1018         sr->s_ndn.bv_len = opc->sndn.bv_len;
1019         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1020                  opc->sndn.bv_val ) + 1;
1021         sr->s_uuid.bv_len = opc->suuid.bv_len;
1022         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1023         if ( cookie.bv_len ) {
1024                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1025                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1026         } else {
1027                 sr->s_csn.bv_val = NULL;
1028         }
1029         sr->s_csn.bv_len = cookie.bv_len;
1030
1031         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1032                 ch_free( cookie.bv_val );
1033         }
1034
1035         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1036         if ( !so->s_res ) {
1037                 so->s_res = sr;
1038         } else {
1039                 so->s_restail->s_next = sr;
1040         }
1041         so->s_restail = sr;
1042
1043         /* If the base of the psearch was modified, check it next time round */
1044         if ( so->s_flags & PS_WROTE_BASE ) {
1045                 so->s_flags ^= PS_WROTE_BASE;
1046                 so->s_flags |= PS_FIND_BASE;
1047         }
1048         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1049                 syncprov_qstart( so );
1050         }
1051         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1052         return LDAP_SUCCESS;
1053 }
1054
1055 static int
1056 syncprov_drop_psearch( syncops *so, int lock )
1057 {
1058         if ( so->s_flags & PS_IS_DETACHED ) {
1059                 if ( lock )
1060                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1061                 so->s_op->o_conn->c_n_ops_executing--;
1062                 so->s_op->o_conn->c_n_ops_completed++;
1063                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1064                         o_next );
1065                 if ( lock )
1066                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1067         }
1068         syncprov_free_syncop( so );
1069
1070         return 0;
1071 }
1072
1073 static int
1074 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1075 {
1076         slap_callback *sc = op->o_callback;
1077         op->o_callback = sc->sc_next;
1078         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1079         op->o_tmpfree( sc, op->o_tmpmemctx );
1080         return 0;
1081 }
1082
1083 static int
1084 syncprov_op_abandon( Operation *op, SlapReply *rs )
1085 {
1086         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1087         syncprov_info_t         *si = on->on_bi.bi_private;
1088         syncops *so, *soprev;
1089
1090         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1091         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1092                 soprev=so, so=so->s_next ) {
1093                 if ( so->s_op->o_connid == op->o_connid &&
1094                         so->s_op->o_msgid == op->orn_msgid ) {
1095                                 so->s_op->o_abandon = 1;
1096                                 soprev->s_next = so->s_next;
1097                                 break;
1098                 }
1099         }
1100         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1101         if ( so ) {
1102                 /* Is this really a Cancel exop? */
1103                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1104                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1105                         rs->sr_err = LDAP_CANCELLED;
1106                         send_ldap_result( so->s_op, rs );
1107                         if ( so->s_flags & PS_IS_DETACHED ) {
1108                                 slap_callback *cb;
1109                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1110                                 cb->sc_cleanup = syncprov_ab_cleanup;
1111                                 cb->sc_next = op->o_callback;
1112                                 cb->sc_private = so;
1113                                 return SLAP_CB_CONTINUE;
1114                         }
1115                 }
1116                 syncprov_drop_psearch( so, 0 );
1117         }
1118         return SLAP_CB_CONTINUE;
1119 }
1120
1121 /* Find which persistent searches are affected by this operation */
1122 static void
1123 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1124 {
1125         slap_overinst *on = opc->son;
1126         syncprov_info_t         *si = on->on_bi.bi_private;
1127
1128         fbase_cookie fc;
1129         syncops *ss, *sprev, *snext;
1130         Entry *e = NULL;
1131         Attribute *a;
1132         int rc;
1133         struct berval newdn;
1134         int freefdn = 0;
1135         BackendDB *b0 = op->o_bd, db;
1136
1137         fc.fdn = &op->o_req_ndn;
1138         /* compute new DN */
1139         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1140                 struct berval pdn;
1141                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1142                 else dnParent( fc.fdn, &pdn );
1143                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1144                 fc.fdn = &newdn;
1145                 freefdn = 1;
1146         }
1147         if ( op->o_tag != LDAP_REQ_ADD ) {
1148                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1149                         db = *op->o_bd;
1150                         op->o_bd = &db;
1151                 }
1152                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1153                 /* If we're sending responses now, make a copy and unlock the DB */
1154                 if ( e && !saveit ) {
1155                         Entry *e2 = entry_dup( e );
1156                         overlay_entry_release_ov( op, e, 0, on );
1157                         e = e2;
1158                 }
1159                 if ( rc ) {
1160                         op->o_bd = b0;
1161                         return;
1162                 }
1163         } else {
1164                 e = op->ora_e;
1165         }
1166
1167         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1168                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1169                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1170                 opc->sreference = is_entry_referral( e );
1171                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1172                 if ( a )
1173                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1174         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1175                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1176                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1177                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1178                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1179         }
1180
1181         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1182         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1183                 sprev = ss, ss=snext)
1184         {
1185                 Operation op2;
1186                 Opheader oh;
1187                 syncmatches *sm;
1188                 int found = 0;
1189
1190                 snext = ss->s_next;
1191                 if ( ss->s_op->o_abandon )
1192                         continue;
1193
1194                 /* First time thru, check for possible skips */
1195                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1196
1197                         /* Don't send ops back to the originator */
1198                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1199                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1200                                         opc->osid, 0, 0 );
1201                                 continue;
1202                         }
1203
1204                         /* Don't send ops back to the messenger */
1205                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1206                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1207                                         opc->rsid, 0, 0 );
1208                                 continue;
1209                         }
1210                 }
1211
1212                 /* validate base */
1213                 fc.fss = ss;
1214                 fc.fbase = 0;
1215                 fc.fscope = 0;
1216
1217                 /* If the base of the search is missing, signal a refresh */
1218                 rc = syncprov_findbase( op, &fc );
1219                 if ( rc != LDAP_SUCCESS ) {
1220                         SlapReply rs = {REP_RESULT};
1221                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1222                                 "search base has changed" );
1223                         sprev->s_next = snext;
1224                         syncprov_drop_psearch( ss, 1 );
1225                         ss = sprev;
1226                         continue;
1227                 }
1228
1229
1230                 /* If we're sending results now, look for this op in old matches */
1231                 if ( !saveit ) {
1232                         syncmatches *old;
1233
1234                         /* Did we modify the search base? */
1235                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1236                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1237                                 ss->s_flags |= PS_WROTE_BASE;
1238                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1239                         }
1240
1241                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1242                                 old=sm, sm=sm->sm_next ) {
1243                                 if ( sm->sm_op == ss ) {
1244                                         found = 1;
1245                                         old->sm_next = sm->sm_next;
1246                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1247                                         break;
1248                                 }
1249                         }
1250                 }
1251
1252                 if ( fc.fscope ) {
1253                         op2 = *ss->s_op;
1254                         oh = *op->o_hdr;
1255                         oh.oh_conn = ss->s_op->o_conn;
1256                         oh.oh_connid = ss->s_op->o_connid;
1257                         op2.o_bd = op->o_bd->bd_self;
1258                         op2.o_hdr = &oh;
1259                         op2.o_extra = op->o_extra;
1260                         op2.o_callback = NULL;
1261                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1262                 }
1263
1264                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1265                         ss->s_sid, fc.fscope, rc );
1266
1267                 /* check if current o_req_dn is in scope and matches filter */
1268                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1269                         if ( saveit ) {
1270                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1271                                 sm->sm_next = opc->smatches;
1272                                 sm->sm_op = ss;
1273                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1274                                 ++ss->s_inuse;
1275                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1276                                 opc->smatches = sm;
1277                         } else {
1278                                 /* if found send UPDATE else send ADD */
1279                                 syncprov_qresp( opc, ss,
1280                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1281                         }
1282                 } else if ( !saveit && found ) {
1283                         /* send DELETE */
1284                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1285                 } else if ( !saveit ) {
1286                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1287                 }
1288                 if ( !saveit && found ) {
1289                         /* Decrement s_inuse, was incremented when called
1290                          * with saveit == TRUE
1291                          */
1292                         syncprov_free_syncop( ss );
1293                 }
1294         }
1295         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1296
1297         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1298                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1299                         op->o_bd = &db;
1300                 }
1301                 overlay_entry_release_ov( op, e, 0, on );
1302                 op->o_bd = b0;
1303         }
1304         if ( freefdn ) {
1305                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1306         }
1307         op->o_bd = b0;
1308 }
1309
1310 static int
1311 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1312 {
1313         slap_callback *cb = op->o_callback;
1314         opcookie *opc = cb->sc_private;
1315         slap_overinst *on = opc->son;
1316         syncprov_info_t         *si = on->on_bi.bi_private;
1317         syncmatches *sm, *snext;
1318         modtarget *mt, mtdummy;
1319
1320         for (sm = opc->smatches; sm; sm=snext) {
1321                 snext = sm->sm_next;
1322                 syncprov_free_syncop( sm->sm_op );
1323                 op->o_tmpfree( sm, op->o_tmpmemctx );
1324         }
1325
1326         /* Remove op from lock table */
1327         mt = opc->smt;
1328         if ( mt ) {
1329                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1330                 mt->mt_mods = mt->mt_mods->mi_next;
1331                 /* If there are more, promote the next one */
1332                 if ( mt->mt_mods ) {
1333                         mt->mt_op = mt->mt_mods->mi_op;
1334                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1335                 } else {
1336                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1337                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1338                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1339                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1340                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1341                         ch_free( mt );
1342                 }
1343         }
1344         if ( !BER_BVISNULL( &opc->suuid ))
1345                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1346         if ( !BER_BVISNULL( &opc->sndn ))
1347                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1348         if ( !BER_BVISNULL( &opc->sdn ))
1349                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1350         op->o_callback = cb->sc_next;
1351         op->o_tmpfree(cb, op->o_tmpmemctx);
1352
1353         return 0;
1354 }
1355
1356 static void
1357 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1358 {
1359         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1360         Modifications mod;
1361         Operation opm;
1362         SlapReply rsm = { 0 };
1363         slap_callback cb = {0};
1364         BackendDB be;
1365
1366 #ifdef CHECK_CSN
1367         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1368
1369         int i;
1370         for ( i=0; i<si->si_numcsns; i++ ) {
1371                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1372         }
1373 #endif
1374         mod.sml_numvals = si->si_numcsns;
1375         mod.sml_values = si->si_ctxcsn;
1376         mod.sml_nvalues = NULL;
1377         mod.sml_desc = slap_schema.si_ad_contextCSN;
1378         mod.sml_op = LDAP_MOD_REPLACE;
1379         mod.sml_flags = SLAP_MOD_INTERNAL;
1380         mod.sml_next = NULL;
1381
1382         cb.sc_response = slap_null_cb;
1383         opm = *op;
1384         opm.o_tag = LDAP_REQ_MODIFY;
1385         opm.o_callback = &cb;
1386         opm.orm_modlist = &mod;
1387         opm.orm_no_opattrs = 1;
1388         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1389                 be = *on->on_info->oi_origdb;
1390                 opm.o_bd = &be;
1391         }
1392         opm.o_req_dn = si->si_contextdn;
1393         opm.o_req_ndn = si->si_contextdn;
1394         opm.o_bd->bd_info = on->on_info->oi_orig;
1395         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1396         opm.o_no_schema_check = 1;
1397         opm.o_bd->be_modify( &opm, &rsm );
1398
1399         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1400                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1401                 const char      *text;
1402                 char txtbuf[SLAP_TEXT_BUFLEN];
1403                 size_t textlen = sizeof txtbuf;
1404                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1405                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1406                 opm.ora_e = e;
1407                 opm.o_bd->be_add( &opm, &rsm );
1408                 if ( e == opm.ora_e )
1409                         be_entry_release_w( &opm, opm.ora_e );
1410         }
1411
1412         if ( mod.sml_next != NULL ) {
1413                 slap_mods_free( mod.sml_next, 1 );
1414         }
1415 #ifdef CHECK_CSN
1416         for ( i=0; i<si->si_numcsns; i++ ) {
1417                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1418         }
1419 #endif
1420 }
1421
1422 static void
1423 syncprov_add_slog( Operation *op )
1424 {
1425         opcookie *opc = op->o_callback->sc_private;
1426         slap_overinst *on = opc->son;
1427         syncprov_info_t         *si = on->on_bi.bi_private;
1428         sessionlog *sl;
1429         slog_entry *se;
1430
1431         sl = si->si_logs;
1432         {
1433                 /* Allocate a record. UUIDs are not NUL-terminated. */
1434                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1435                         op->o_csn.bv_len + 1 );
1436                 se->se_next = NULL;
1437                 se->se_tag = op->o_tag;
1438
1439                 se->se_uuid.bv_val = (char *)(&se[1]);
1440                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1441                 se->se_uuid.bv_len = opc->suuid.bv_len;
1442
1443                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1444                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1445                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1446                 se->se_csn.bv_len = op->o_csn.bv_len;
1447                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1448
1449                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1450                 if ( sl->sl_head ) {
1451                         sl->sl_tail->se_next = se;
1452                 } else {
1453                         sl->sl_head = se;
1454                 }
1455                 sl->sl_tail = se;
1456                 sl->sl_num++;
1457                 while ( sl->sl_num > sl->sl_size ) {
1458                         se = sl->sl_head;
1459                         sl->sl_head = se->se_next;
1460                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1461                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1462                         ch_free( se );
1463                         sl->sl_num--;
1464                 }
1465                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1466         }
1467 }
1468
1469 /* Just set a flag if we found the matching entry */
1470 static int
1471 playlog_cb( Operation *op, SlapReply *rs )
1472 {
1473         if ( rs->sr_type == REP_SEARCH ) {
1474                 op->o_callback->sc_private = (void *)1;
1475         }
1476         return rs->sr_err;
1477 }
1478
1479 /* enter with sl->sl_mutex locked, release before returning */
1480 static void
1481 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1482         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1483 {
1484         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1485         slog_entry *se;
1486         int i, j, ndel, num, nmods, mmods;
1487         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1488         BerVarray uuids;
1489         struct berval delcsn[2];
1490
1491         if ( !sl->sl_num ) {
1492                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1493                 return;
1494         }
1495
1496         num = sl->sl_num;
1497         i = 0;
1498         nmods = 0;
1499
1500         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1501                 num * UUID_LEN, op->o_tmpmemctx );
1502         uuids[0].bv_val = (char *)(uuids + num + 1);
1503
1504         delcsn[0].bv_len = 0;
1505         delcsn[0].bv_val = cbuf;
1506         BER_BVZERO(&delcsn[1]);
1507
1508         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1509          * and everything else at the end. Do this first so we can
1510          * unlock the list mutex.
1511          */
1512         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1513                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1514         for ( se=sl->sl_head; se; se=se->se_next ) {
1515                 int k;
1516                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1517                 ndel = 1;
1518                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1519                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1520                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1521                                 break;
1522                         }
1523                 }
1524                 if ( ndel <= 0 ) {
1525                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1526                         continue;
1527                 }
1528                 ndel = 0;
1529                 for ( k=0; k<numcsns; k++ ) {
1530                         if ( se->se_sid == sids[k] ) {
1531                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1532                                 break;
1533                         }
1534                 }
1535                 if ( ndel > 0 ) {
1536                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1537                         break;
1538                 }
1539                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1540                         j = i;
1541                         i++;
1542                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1543                         delcsn[0].bv_len = se->se_csn.bv_len;
1544                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1545                 } else {
1546                         nmods++;
1547                         j = num - nmods;
1548                 }
1549                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1550                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1551                 uuids[j].bv_len = UUID_LEN;
1552         }
1553         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1554
1555         ndel = i;
1556
1557         /* Zero out unused slots */
1558         for ( i=ndel; i < num - nmods; i++ )
1559                 uuids[i].bv_len = 0;
1560
1561         /* Mods must be validated to see if they belong in this delete set.
1562          */
1563
1564         mmods = nmods;
1565         /* Strip any duplicates */
1566         for ( i=0; i<nmods; i++ ) {
1567                 for ( j=0; j<ndel; j++ ) {
1568                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1569                                 uuids[num - 1 - i].bv_len = 0;
1570                                 mmods --;
1571                                 break;
1572                         }
1573                 }
1574                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1575                 for ( j=0; j<i; j++ ) {
1576                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1577                                 uuids[num - 1 - i].bv_len = 0;
1578                                 mmods --;
1579                                 break;
1580                         }
1581                 }
1582         }
1583
1584         if ( mmods ) {
1585                 Operation fop;
1586                 SlapReply frs = { REP_RESULT };
1587                 int rc;
1588                 Filter mf, af;
1589                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1590                 slap_callback cb = {0};
1591
1592                 fop = *op;
1593
1594                 fop.o_sync_mode = 0;
1595                 fop.o_callback = &cb;
1596                 fop.ors_limit = NULL;
1597                 fop.ors_tlimit = SLAP_NO_LIMIT;
1598                 fop.ors_attrs = slap_anlist_all_attributes;
1599                 fop.ors_attrsonly = 0;
1600                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1601
1602                 af.f_choice = LDAP_FILTER_AND;
1603                 af.f_next = NULL;
1604                 af.f_and = &mf;
1605                 mf.f_choice = LDAP_FILTER_EQUALITY;
1606                 mf.f_ava = &eq;
1607                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1608                 mf.f_next = fop.ors_filter;
1609
1610                 fop.ors_filter = &af;
1611
1612                 cb.sc_response = playlog_cb;
1613                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1614
1615                 for ( i=ndel; i<num; i++ ) {
1616                         if ( uuids[i].bv_len == 0 ) continue;
1617
1618                         mf.f_av_value = uuids[i];
1619                         cb.sc_private = NULL;
1620                         fop.ors_slimit = 1;
1621                         frs.sr_nentries = 0;
1622                         rc = fop.o_bd->be_search( &fop, &frs );
1623
1624                         /* If entry was not found, add to delete list */
1625                         if ( !cb.sc_private ) {
1626                                 uuids[ndel++] = uuids[i];
1627                         }
1628                 }
1629                 fop.o_bd->bd_info = (BackendInfo *)on;
1630         }
1631         if ( ndel ) {
1632                 struct berval cookie;
1633
1634                 if ( delcsn[0].bv_len ) {
1635                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1636                                 slap_serverID ? slap_serverID : -1 );
1637
1638                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1639                 }
1640
1641                 uuids[ndel].bv_val = NULL;
1642                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1643                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1644                 if ( delcsn[0].bv_len ) {
1645                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1646                 }
1647         }
1648         op->o_tmpfree( uuids, op->o_tmpmemctx );
1649 }
1650
1651 static int
1652 syncprov_op_response( Operation *op, SlapReply *rs )
1653 {
1654         opcookie *opc = op->o_callback->sc_private;
1655         slap_overinst *on = opc->son;
1656         syncprov_info_t         *si = on->on_bi.bi_private;
1657         syncmatches *sm;
1658
1659         if ( rs->sr_err == LDAP_SUCCESS )
1660         {
1661                 struct berval maxcsn;
1662                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1663                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1664
1665                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1666
1667                 /* Update our context CSN */
1668                 cbuf[0] = '\0';
1669                 maxcsn.bv_val = cbuf;
1670                 maxcsn.bv_len = sizeof(cbuf);
1671                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1672
1673                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1674                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1675                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1676                         /* Catch contextCSN updates from syncrepl. We have to look at
1677                          * all the attribute values, as there may be more than one csn
1678                          * that changed, and only one can be passed in the csn queue.
1679                          */
1680                         Modifications *mod = op->orm_modlist;
1681                         int i, j, sid;
1682
1683                         for ( i=0; i<mod->sml_numvals; i++ ) {
1684                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1685
1686                                 for ( j=0; j<si->si_numcsns; j++ ) {
1687                                         if ( sid == si->si_sids[j] ) {
1688                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1689                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1690                                                         csn_changed = 1;
1691                                                 }
1692                                                 break;
1693                                         }
1694                                 }
1695
1696                                 if ( j == si->si_numcsns ) {
1697                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1698                                         si->si_numcsns++;
1699                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1700                                                 sizeof(int));
1701                                         si->si_sids[j] = sid;
1702                                         csn_changed = 1;
1703                                 }
1704                         }
1705                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1706
1707                         if ( csn_changed ) {
1708                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1709                                 have_psearches = ( si->si_ops != NULL );
1710                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1711
1712                                 if ( have_psearches ) {
1713                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1714                                                 if ( sm->sm_op->s_op->o_abandon )
1715                                                         continue;
1716                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1717                                         }
1718                                 }
1719                         }
1720                         goto leave;
1721                 }
1722
1723                 slap_get_commit_csn( op, &maxcsn, &foundit );
1724                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1725                         /* syncrepl queues the CSN values in the db where
1726                          * it is configured , not where the changes are made.
1727                          * So look for a value in the glue db if we didn't
1728                          * find any in this db.
1729                          */
1730                         BackendDB *be = op->o_bd;
1731                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1732                         maxcsn.bv_val = cbuf;
1733                         maxcsn.bv_len = sizeof(cbuf);
1734                         slap_get_commit_csn( op, &maxcsn, &foundit );
1735                         op->o_bd = be;
1736                 }
1737                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1738                         int i, sid;
1739 #ifdef CHECK_CSN
1740                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1741                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1742 #endif
1743                         sid = slap_parse_csn_sid( &maxcsn );
1744                         for ( i=0; i<si->si_numcsns; i++ ) {
1745                                 if ( sid == si->si_sids[i] ) {
1746                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1747                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1748                                                 csn_changed = 1;
1749                                         }
1750                                         break;
1751                                 }
1752                         }
1753                         /* It's a new SID for us */
1754                         if ( i == si->si_numcsns ) {
1755                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1756                                 csn_changed = 1;
1757                                 si->si_numcsns++;
1758                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1759                                         sizeof(int));
1760                                 si->si_sids[i] = sid;
1761                         }
1762 #if 0
1763                 } else if ( !foundit ) {
1764                         /* internal ops that aren't meant to be replicated */
1765                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1766                         return SLAP_CB_CONTINUE;
1767 #endif
1768                 }
1769
1770                 /* Don't do any processing for consumer contextCSN updates */
1771                 if ( op->o_dont_replicate ) {
1772                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1773                         goto leave;
1774                 }
1775
1776                 si->si_numops++;
1777                 if ( si->si_chkops || si->si_chktime ) {
1778                         /* Never checkpoint adding the context entry,
1779                          * it will deadlock
1780                          */
1781                         if ( op->o_tag != LDAP_REQ_ADD ||
1782                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1783                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1784                                         do_check = 1;
1785                                         si->si_numops = 0;
1786                                 }
1787                                 if ( si->si_chktime &&
1788                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1789                                         if ( si->si_chklast ) {
1790                                                 do_check = 1;
1791                                                 si->si_chklast = op->o_time;
1792                                         } else {
1793                                                 si->si_chklast = 1;
1794                                         }
1795                                 }
1796                         }
1797                 }
1798                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1799
1800                 if ( do_check ) {
1801                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1802                         syncprov_checkpoint( op, rs, on );
1803                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1804                 }
1805
1806                 /* only update consumer ctx if this is a newer csn */
1807                 if ( csn_changed ) {
1808                         opc->sctxcsn = maxcsn;
1809                 }
1810
1811                 /* Handle any persistent searches */
1812                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1813                 have_psearches = ( si->si_ops != NULL );
1814                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1815                 if ( have_psearches ) {
1816                         switch(op->o_tag) {
1817                         case LDAP_REQ_ADD:
1818                         case LDAP_REQ_MODIFY:
1819                         case LDAP_REQ_MODRDN:
1820                         case LDAP_REQ_EXTENDED:
1821                                 syncprov_matchops( op, opc, 0 );
1822                                 break;
1823                         case LDAP_REQ_DELETE:
1824                                 /* for each match in opc->smatches:
1825                                  *   send DELETE msg
1826                                  */
1827                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1828                                         if ( sm->sm_op->s_op->o_abandon )
1829                                                 continue;
1830                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1831                                 }
1832                                 break;
1833                         }
1834                 }
1835
1836                 /* Add any log records */
1837                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1838                         syncprov_add_slog( op );
1839                 }
1840 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1841         }
1842         return SLAP_CB_CONTINUE;
1843 }
1844
1845 /* We don't use a subentry to store the context CSN any more.
1846  * We expose the current context CSN as an operational attribute
1847  * of the suffix entry.
1848  */
1849 static int
1850 syncprov_op_compare( Operation *op, SlapReply *rs )
1851 {
1852         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1853         syncprov_info_t         *si = on->on_bi.bi_private;
1854         int rc = SLAP_CB_CONTINUE;
1855
1856         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1857                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1858         {
1859                 Entry e = {0};
1860                 Attribute a = {0};
1861
1862                 e.e_name = si->si_contextdn;
1863                 e.e_nname = si->si_contextdn;
1864                 e.e_attrs = &a;
1865
1866                 a.a_desc = slap_schema.si_ad_contextCSN;
1867
1868                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1869
1870                 a.a_vals = si->si_ctxcsn;
1871                 a.a_nvals = a.a_vals;
1872                 a.a_numvals = si->si_numcsns;
1873
1874                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1875                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1876                 if ( ! rs->sr_err ) {
1877                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1878                         goto return_results;
1879                 }
1880
1881                 if ( get_assert( op ) &&
1882                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1883                 {
1884                         rs->sr_err = LDAP_ASSERTION_FAILED;
1885                         goto return_results;
1886                 }
1887
1888
1889                 rs->sr_err = LDAP_COMPARE_FALSE;
1890
1891                 if ( attr_valfind( &a,
1892                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1893                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1894                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1895                 {
1896                         rs->sr_err = LDAP_COMPARE_TRUE;
1897                 }
1898
1899 return_results:;
1900
1901                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1902
1903                 send_ldap_result( op, rs );
1904
1905                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1906                         rs->sr_err = LDAP_SUCCESS;
1907                 }
1908                 rc = rs->sr_err;
1909         }
1910
1911         return rc;
1912 }
1913
1914 static int
1915 syncprov_op_mod( Operation *op, SlapReply *rs )
1916 {
1917         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1918         syncprov_info_t         *si = on->on_bi.bi_private;
1919         slap_callback *cb;
1920         opcookie *opc;
1921         int have_psearches, cbsize;
1922
1923         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1924         have_psearches = ( si->si_ops != NULL );
1925         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1926
1927         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1928                 (have_psearches ? sizeof(modinst) : 0 );
1929
1930         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1931         opc = (opcookie *)(cb+1);
1932         opc->son = on;
1933         cb->sc_response = syncprov_op_response;
1934         cb->sc_cleanup = syncprov_op_cleanup;
1935         cb->sc_private = opc;
1936         cb->sc_next = op->o_callback;
1937         op->o_callback = cb;
1938
1939         opc->osid = -1;
1940         opc->rsid = -1;
1941         if ( op->o_csn.bv_val ) {
1942                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1943         }
1944         if ( op->o_controls ) {
1945                 struct sync_cookie *scook =
1946                 op->o_controls[slap_cids.sc_LDAPsync];
1947                 if ( scook )
1948                         opc->rsid = scook->sid;
1949         }
1950
1951         /* If there are active persistent searches, lock this operation.
1952          * See seqmod.c for the locking logic on its own.
1953          */
1954         if ( have_psearches ) {
1955                 modtarget *mt, mtdummy;
1956                 modinst *mi;
1957
1958                 mi = (modinst *)(opc+1);
1959                 mi->mi_op = op;
1960
1961                 /* See if we're already modifying this entry... */
1962                 mtdummy.mt_op = op;
1963                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1964                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1965                 if ( mt ) {
1966                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1967                         if ( mt->mt_mods == NULL ) {
1968                                 /* Cannot reuse this mt, as another thread is about
1969                                  * to release it in syncprov_op_cleanup.
1970                                  */
1971                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1972                                 mt = NULL;
1973                         }
1974                 }
1975                 if ( mt ) {
1976                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1977                         mt->mt_tail->mi_next = mi;
1978                         mt->mt_tail = mi;
1979                         /* wait for this op to get to head of list */
1980                         while ( mt->mt_mods != mi ) {
1981                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1982                                 /* FIXME: if dynamic config can delete overlays or
1983                                  * databases we'll have to check for cleanup here.
1984                                  * Currently it's not an issue because there are
1985                                  * no dynamic config deletes...
1986                                  */
1987                                 if ( slapd_shutdown )
1988                                         return SLAPD_ABANDON;
1989
1990                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1991                                         ldap_pvt_thread_yield();
1992                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1993
1994                                 /* clean up if the caller is giving up */
1995                                 if ( op->o_abandon ) {
1996                                         modinst *m2;
1997                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1998                                                 m2 = m2->mi_next );
1999                                         m2->mi_next = mi->mi_next;
2000                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2001                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2002                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2003                                         return SLAPD_ABANDON;
2004                                 }
2005                         }
2006                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2007                 } else {
2008                         /* Record that we're modifying this entry now */
2009                         mt = ch_malloc( sizeof(modtarget) );
2010                         mt->mt_mods = mi;
2011                         mt->mt_tail = mi;
2012                         mt->mt_op = mi->mi_op;
2013                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2014                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2015                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2016                 }
2017                 opc->smt = mt;
2018         }
2019
2020         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2021                 syncprov_matchops( op, opc, 1 );
2022
2023         return SLAP_CB_CONTINUE;
2024 }
2025
2026 static int
2027 syncprov_op_extended( Operation *op, SlapReply *rs )
2028 {
2029         if ( exop_is_write( op ))
2030                 return syncprov_op_mod( op, rs );
2031
2032         return SLAP_CB_CONTINUE;
2033 }
2034
2035 typedef struct searchstate {
2036         slap_overinst *ss_on;
2037         syncops *ss_so;
2038         BerVarray ss_ctxcsn;
2039         int *ss_sids;
2040         int ss_numcsns;
2041 #define SS_PRESENT      0x01
2042 #define SS_CHANGED      0x02
2043         int ss_flags;
2044 } searchstate;
2045
2046 static int
2047 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2048 {
2049         if ( rs->sr_ctrls ) {
2050                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2051                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2052                 rs->sr_ctrls = NULL;
2053         }
2054         return 0;
2055 }
2056
2057 typedef struct SyncOperationBuffer {
2058         Operation               sob_op;
2059         Opheader                sob_hdr;
2060         OpExtra                 sob_oe;
2061         AttributeName   sob_extra;      /* not always present */
2062         /* Further data allocated here */
2063 } SyncOperationBuffer;
2064
2065 static void
2066 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2067 {
2068         SyncOperationBuffer *sopbuf2;
2069         Operation *op2;
2070         int i, alen = 0;
2071         size_t size;
2072         char *ptr;
2073         GroupAssertion *g1, *g2;
2074
2075         /* count the search attrs */
2076         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2077                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2078         }
2079         /* Make a new copy of the operation */
2080         size = offsetof( SyncOperationBuffer, sob_extra ) +
2081                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2082                 op->o_req_dn.bv_len + 1 +
2083                 op->o_req_ndn.bv_len + 1 +
2084                 op->o_ndn.bv_len + 1 +
2085                 so->s_filterstr.bv_len + 1;
2086         sopbuf2 = ch_calloc( 1, size );
2087         op2 = &sopbuf2->sob_op;
2088         op2->o_hdr = &sopbuf2->sob_hdr;
2089         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2090
2091         /* Copy the fields we care about explicitly, leave the rest alone */
2092         *op2->o_hdr = *op->o_hdr;
2093         op2->o_tag = op->o_tag;
2094         op2->o_time = op->o_time;
2095         op2->o_bd = on->on_info->oi_origdb;
2096         op2->o_request = op->o_request;
2097         op2->o_managedsait = op->o_managedsait;
2098         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2099         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2100
2101         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2102         if ( i ) {
2103                 op2->ors_attrs = (AttributeName *) ptr;
2104                 ptr = (char *) &op2->ors_attrs[i+1];
2105                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2106                         op2->ors_attrs[i] = op->ors_attrs[i];
2107                         op2->ors_attrs[i].an_name.bv_val = ptr;
2108                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2109                 }
2110                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2111         }
2112
2113         op2->o_authz = op->o_authz;
2114         op2->o_ndn.bv_val = ptr;
2115         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2116         op2->o_dn = op2->o_ndn;
2117         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2118         op2->o_req_dn.bv_val = ptr;
2119         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2120         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2121         op2->o_req_ndn.bv_val = ptr;
2122         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2123         op2->ors_filterstr.bv_val = ptr;
2124         strcpy( ptr, so->s_filterstr.bv_val );
2125         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2126
2127         /* Skip the AND/GE clause that we stuck on in front */
2128         if ( so->s_flags & PS_FIX_FILTER ) {
2129                 op2->ors_filter = op->ors_filter->f_and->f_next;
2130                 so->s_flags ^= PS_FIX_FILTER;
2131         } else {
2132                 op2->ors_filter = op->ors_filter;
2133         }
2134         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2135         so->s_op = op2;
2136
2137         /* Copy any cached group ACLs individually */
2138         op2->o_groups = NULL;
2139         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2140                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2141                 *g2 = *g1;
2142                 strcpy( g2->ga_ndn, g1->ga_ndn );
2143                 g2->ga_next = op2->o_groups;
2144                 op2->o_groups = g2;
2145         }
2146         /* Don't allow any further group caching */
2147         op2->o_do_not_cache = 1;
2148
2149         /* Add op2 to conn so abandon will find us */
2150         op->o_conn->c_n_ops_executing++;
2151         op->o_conn->c_n_ops_completed--;
2152         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2153         so->s_flags |= PS_IS_DETACHED;
2154
2155         /* Prevent anyone else from trying to send a result for this op */
2156         op->o_abandon = 1;
2157 }
2158
2159 static int
2160 syncprov_search_response( Operation *op, SlapReply *rs )
2161 {
2162         searchstate *ss = op->o_callback->sc_private;
2163         slap_overinst *on = ss->ss_on;
2164         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2165         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2166
2167         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2168                 Attribute *a;
2169                 /* If we got a referral without a referral object, there's
2170                  * something missing that we cannot replicate. Just ignore it.
2171                  * The consumer will abort because we didn't send the expected
2172                  * control.
2173                  */
2174                 if ( !rs->sr_entry ) {
2175                         assert( rs->sr_entry != NULL );
2176                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2177                         return SLAP_CB_CONTINUE;
2178                 }
2179                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2180                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2181                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2182                 }
2183                 if ( a ) {
2184                         int i, sid;
2185                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2186
2187                         /* Don't send changed entries back to the originator */
2188                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2189                                 Debug( LDAP_DEBUG_SYNC,
2190                                         "Entry %s changed by peer, ignored\n",
2191                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2192                                 return LDAP_SUCCESS;
2193                         }
2194
2195                         /* If not a persistent search */
2196                         if ( !ss->ss_so ) {
2197                                 /* Make sure entry is less than the snapshot'd contextCSN */
2198                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2199                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2200                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2201                                                 Debug( LDAP_DEBUG_SYNC,
2202                                                         "Entry %s CSN %s greater than snapshot %s\n",
2203                                                         rs->sr_entry->e_name.bv_val,
2204                                                         a->a_nvals[0].bv_val,
2205                                                         ss->ss_ctxcsn[i].bv_val );
2206                                                 return LDAP_SUCCESS;
2207                                         }
2208                                 }
2209                         }
2210
2211                         /* Don't send old entries twice */
2212                         if ( srs->sr_state.ctxcsn ) {
2213                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2214                                         if ( sid == srs->sr_state.sids[i] &&
2215                                                 ber_bvcmp( &a->a_nvals[0],
2216                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2217                                                 Debug( LDAP_DEBUG_SYNC,
2218                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2219                                                         rs->sr_entry->e_name.bv_val,
2220                                                         a->a_nvals[0].bv_val,
2221                                                         srs->sr_state.ctxcsn[i].bv_val );
2222                                                 return LDAP_SUCCESS;
2223                                         }
2224                                 }
2225                         }
2226                 }
2227                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2228                         op->o_tmpmemctx );
2229                 rs->sr_ctrls[1] = NULL;
2230                 /* If we're in delta-sync mode, always send a cookie */
2231                 if ( si->si_nopres && si->si_usehint && a ) {
2232                         struct berval cookie;
2233                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2234                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2235                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2236                 } else {
2237                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2238                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2239                 }
2240         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2241                 struct berval cookie = BER_BVNULL;
2242
2243                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2244                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2245                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2246                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2247
2248                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2249                 }
2250
2251                 /* Is this a regular refresh?
2252                  * Note: refresh never gets here if there were no changes
2253                  */
2254                 if ( !ss->ss_so ) {
2255                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2256                                 op->o_tmpmemctx );
2257                         rs->sr_ctrls[1] = NULL;
2258                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2259                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2260                                         LDAP_SYNC_REFRESH_DELETES );
2261                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2262                 } else {
2263                 /* It's RefreshAndPersist, transition to Persist phase */
2264                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2265                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2266                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2267                                 1, NULL, 0 );
2268                         if ( !BER_BVISNULL( &cookie ))
2269                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2270
2271                         /* Detach this Op from frontend control */
2272                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2273
2274                         /* But not if this connection was closed along the way */
2275                         if ( op->o_abandon ) {
2276                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2277                                 /* syncprov_ab_cleanup will free this syncop */
2278                                 return SLAPD_ABANDON;
2279
2280                         } else {
2281                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2282                                 /* Turn off the refreshing flag */
2283                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2284
2285                                 syncprov_detach_op( op, ss->ss_so, on );
2286
2287                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2288
2289                                 /* If there are queued responses, fire them off */
2290                                 if ( ss->ss_so->s_res )
2291                                         syncprov_qstart( ss->ss_so );
2292                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2293                         }
2294
2295                         return LDAP_SUCCESS;
2296                 }
2297         }
2298
2299         return SLAP_CB_CONTINUE;
2300 }
2301
2302 static int
2303 syncprov_op_search( Operation *op, SlapReply *rs )
2304 {
2305         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2306         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2307         slap_callback   *cb;
2308         int gotstate = 0, changed = 0, do_present = 0;
2309         syncops *sop = NULL;
2310         searchstate *ss;
2311         sync_control *srs;
2312         BerVarray ctxcsn;
2313         int i, *sids, numcsns;
2314         struct berval mincsn;
2315
2316         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2317
2318         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2319                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2320                 return rs->sr_err;
2321         }
2322
2323         srs = op->o_controls[slap_cids.sc_LDAPsync];
2324
2325         /* If this is a persistent search, set it up right away */
2326         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2327                 syncops so = {0};
2328                 fbase_cookie fc;
2329                 opcookie opc;
2330                 slap_callback sc;
2331
2332                 fc.fss = &so;
2333                 fc.fbase = 0;
2334                 so.s_eid = NOID;
2335                 so.s_op = op;
2336                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2337                 /* syncprov_findbase expects to be called as a callback... */
2338                 sc.sc_private = &opc;
2339                 opc.son = on;
2340                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2341                 cb = op->o_callback;
2342                 op->o_callback = &sc;
2343                 rs->sr_err = syncprov_findbase( op, &fc );
2344                 op->o_callback = cb;
2345                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2346
2347                 if ( rs->sr_err != LDAP_SUCCESS ) {
2348                         send_ldap_result( op, rs );
2349                         return rs->sr_err;
2350                 }
2351                 sop = ch_malloc( sizeof( syncops ));
2352                 *sop = so;
2353                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2354                 sop->s_rid = srs->sr_state.rid;
2355                 sop->s_sid = srs->sr_state.sid;
2356                 sop->s_inuse = 1;
2357
2358                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2359                 sop->s_next = si->si_ops;
2360                 si->si_ops = sop;
2361                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2362         }
2363
2364         /* snapshot the ctxcsn */
2365         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2366         numcsns = si->si_numcsns;
2367         if ( numcsns ) {
2368                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2369                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2370                 for ( i=0; i<numcsns; i++ )
2371                         sids[i] = si->si_sids[i];
2372         } else {
2373                 ctxcsn = NULL;
2374                 sids = NULL;
2375         }
2376         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2377
2378         /* If we have a cookie, handle the PRESENT lookups */
2379         if ( srs->sr_state.ctxcsn ) {
2380                 sessionlog *sl;
2381                 int i, j;
2382
2383                 /* If we don't have any CSN of our own yet, pretend nothing
2384                  * has changed.
2385                  */
2386                 if ( !numcsns )
2387                         goto no_change;
2388
2389                 if ( !si->si_nopres )
2390                         do_present = SS_PRESENT;
2391
2392                 /* If there are SIDs we don't recognize in the cookie, drop them */
2393                 for (i=0; i<srs->sr_state.numcsns; ) {
2394                         for (j=0; j<numcsns; j++) {
2395                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2396                                         break;
2397                                 }
2398                         }
2399                         /* not found */
2400                         if ( j == numcsns ) {
2401                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2402                                 j = srs->sr_state.numcsns - 1;
2403                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2404                                 tmp.bv_len = 0;
2405                                 srs->sr_state.ctxcsn[j] = tmp;
2406                                 srs->sr_state.numcsns = j;
2407                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2408                                 continue;
2409                         }
2410                         i++;
2411                 }
2412
2413                 /* Find the smallest CSN */
2414                 mincsn = srs->sr_state.ctxcsn[0];
2415                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2416                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2417                                 mincsn = srs->sr_state.ctxcsn[i];
2418                 }
2419
2420                 /* If nothing has changed, shortcut it */
2421                 if ( srs->sr_state.numcsns == numcsns ) {
2422                         int i, j, newer;
2423                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2424                                 for ( j=0; j<numcsns; j++ ) {
2425                                         if ( srs->sr_state.sids[i] != sids[j] )
2426                                                 continue;
2427                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2428                                         /* If our state is newer, tell consumer about changes */
2429                                         if ( newer < 0 )
2430                                                 changed = SS_CHANGED;
2431                                         else if ( newer > 0 ) {
2432                                         /* our state is older, tell consumer nothing */
2433                                                 if ( sop ) {
2434                                                         syncops **sp = &si->si_ops;
2435
2436                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2437                                                         while ( *sp != sop )
2438                                                                 sp = &(*sp)->s_next;
2439                                                         *sp = sop->s_next;
2440                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2441                                                         ch_free( sop );
2442                                                 }
2443                                                 rs->sr_err = LDAP_SUCCESS;
2444                                                 rs->sr_ctrls = NULL;
2445                                                 send_ldap_result( op, rs );
2446                                                 return rs->sr_err;
2447                                         }
2448                                         break;
2449                                 }
2450                                 if ( changed )
2451                                         break;
2452                         }
2453                         if ( !changed ) {
2454                                 do_present = 0;
2455 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2456                                         LDAPControl     *ctrls[2];
2457
2458                                         ctrls[0] = NULL;
2459                                         ctrls[1] = NULL;
2460                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2461                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2462                                         rs->sr_ctrls = ctrls;
2463                                         rs->sr_err = LDAP_SUCCESS;
2464                                         send_ldap_result( op, rs );
2465                                         rs->sr_ctrls = NULL;
2466                                         return rs->sr_err;
2467                                 }
2468                                 goto shortcut;
2469                         }
2470                 } else {
2471                         /* consumer doesn't have the right number of CSNs */
2472                         changed = SS_CHANGED;
2473                 }
2474                 /* Do we have a sessionlog for this search? */
2475                 sl=si->si_logs;
2476                 if ( sl ) {
2477                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2478                         /* Are there any log entries, and is the consumer state
2479                          * present in the session log?
2480                          */
2481                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2482                                 do_present = 0;
2483                                 /* mutex is unlocked in playlog */
2484                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2485                         } else {
2486                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2487                         }
2488                 }
2489                 /* Is the CSN still present in the database? */
2490                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2491                         /* No, so a reload is required */
2492                         /* the 2.2 consumer doesn't send this hint */
2493                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2494                                 if ( ctxcsn )
2495                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2496                                 if ( sids )
2497                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2498                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2499                                 return rs->sr_err;
2500                         }
2501                         if ( srs->sr_state.ctxcsn ) {
2502                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2503                                 srs->sr_state.ctxcsn = NULL;
2504                         }
2505                         if ( srs->sr_state.sids ) {
2506                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2507                                 srs->sr_state.sids = NULL;
2508                         }
2509                         srs->sr_state.numcsns = 0;
2510                 } else {
2511                         gotstate = 1;
2512                         /* If changed and doing Present lookup, send Present UUIDs */
2513                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2514                                 LDAP_SUCCESS ) {
2515                                 if ( ctxcsn )
2516                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2517                                 if ( sids )
2518                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2519                                 send_ldap_result( op, rs );
2520                                 return rs->sr_err;
2521                         }
2522                 }
2523         } else {
2524                 /* No consumer state, assume something has changed */
2525                 changed = SS_CHANGED;
2526         }
2527
2528 shortcut:
2529         /* Append CSN range to search filter, save original filter
2530          * for persistent search evaluation
2531          */
2532         if ( sop ) {
2533                 sop->s_filterstr= op->ors_filterstr;
2534         }
2535
2536         /* If something changed, find the changes */
2537         if ( gotstate && changed ) {
2538                 Filter *fand, *fava;
2539
2540                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2541                 fand->f_choice = LDAP_FILTER_AND;
2542                 fand->f_next = NULL;
2543                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2544                 fand->f_and = fava;
2545                 fava->f_choice = LDAP_FILTER_GE;
2546                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2547                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2548 #ifdef LDAP_COMP_MATCH
2549                 fava->f_ava->aa_cf = NULL;
2550 #endif
2551                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2552                 fava->f_next = op->ors_filter;
2553                 op->ors_filter = fand;
2554                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2555                 if ( sop )
2556                         sop->s_flags |= PS_FIX_FILTER;
2557         }
2558
2559         /* Let our callback add needed info to returned entries */
2560         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2561         ss = (searchstate *)(cb+1);
2562         ss->ss_on = on;
2563         ss->ss_so = sop;
2564         ss->ss_flags = do_present | changed;
2565         ss->ss_ctxcsn = ctxcsn;
2566         ss->ss_numcsns = numcsns;
2567         ss->ss_sids = sids;
2568         cb->sc_response = syncprov_search_response;
2569         cb->sc_cleanup = syncprov_search_cleanup;
2570         cb->sc_private = ss;
2571         cb->sc_next = op->o_callback;
2572         op->o_callback = cb;
2573
2574         /* If this is a persistent search and no changes were reported during
2575          * the refresh phase, just invoke the response callback to transition
2576          * us into persist phase
2577          */
2578         if ( !changed ) {
2579                 rs->sr_err = LDAP_SUCCESS;
2580                 rs->sr_nentries = 0;
2581                 send_ldap_result( op, rs );
2582                 return rs->sr_err;
2583         }
2584         return SLAP_CB_CONTINUE;
2585 }
2586
2587 static int
2588 syncprov_operational(
2589         Operation *op,
2590         SlapReply *rs )
2591 {
2592         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2593         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2594
2595         /* This prevents generating unnecessarily; frontend will strip
2596          * any statically stored copy.
2597          */
2598         if ( op->o_sync != SLAP_CONTROL_NONE )
2599                 return SLAP_CB_CONTINUE;
2600
2601         if ( rs->sr_entry &&
2602                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2603
2604                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2605                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2606                         Attribute *a, **ap = NULL;
2607
2608                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2609                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2610                                         break;
2611                         }
2612
2613                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2614                         if ( si->si_ctxcsn ) {
2615                                 if ( !a ) {
2616                                         for ( ap = &rs->sr_operational_attrs; *ap;
2617                                                 ap=&(*ap)->a_next );
2618
2619                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2620                                         *ap = a;
2621                                 }
2622
2623                                 if ( !ap ) {
2624                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2625                                                 Entry *e = entry_dup( rs->sr_entry );
2626                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2627                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2628                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2629                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2630                                                         entry_free( rs->sr_entry );
2631                                                 }
2632                                                 rs->sr_entry = e;
2633                                                 rs->sr_flags |=
2634                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2635                                                 a = attr_find( rs->sr_entry->e_attrs,
2636                                                         slap_schema.si_ad_contextCSN );
2637                                         }
2638                                         if ( a->a_nvals != a->a_vals ) {
2639                                                 ber_bvarray_free( a->a_nvals );
2640                                         }
2641                                         a->a_nvals = NULL;
2642                                         ber_bvarray_free( a->a_vals );
2643                                         a->a_vals = NULL;
2644                                         a->a_numvals = 0;
2645                                 }
2646                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2647                         }
2648                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2649                 }
2650         }
2651         return SLAP_CB_CONTINUE;
2652 }
2653
2654 enum {
2655         SP_CHKPT = 1,
2656         SP_SESSL,
2657         SP_NOPRES,
2658         SP_USEHINT
2659 };
2660
2661 static ConfigDriver sp_cf_gen;
2662
2663 static ConfigTable spcfg[] = {
2664         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2665                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2666                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2667                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2668         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2669                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2670                         "DESC 'Session log size in ops' "
2671                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2672         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2673                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2674                         "DESC 'Omit Present phase processing' "
2675                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2676         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2677                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2678                         "DESC 'Observe Reload Hint in Request control' "
2679                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2680         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2681 };
2682
2683 static ConfigOCs spocs[] = {
2684         { "( OLcfgOvOc:1.1 "
2685                 "NAME 'olcSyncProvConfig' "
2686                 "DESC 'SyncRepl Provider configuration' "
2687                 "SUP olcOverlayConfig "
2688                 "MAY ( olcSpCheckpoint "
2689                         "$ olcSpSessionlog "
2690                         "$ olcSpNoPresent "
2691                         "$ olcSpReloadHint "
2692                 ") )",
2693                         Cft_Overlay, spcfg },
2694         { NULL, 0, NULL }
2695 };
2696
2697 static int
2698 sp_cf_gen(ConfigArgs *c)
2699 {
2700         slap_overinst           *on = (slap_overinst *)c->bi;
2701         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2702         int rc = 0;
2703
2704         if ( c->op == SLAP_CONFIG_EMIT ) {
2705                 switch ( c->type ) {
2706                 case SP_CHKPT:
2707                         if ( si->si_chkops || si->si_chktime ) {
2708                                 struct berval bv;
2709                                 /* we assume si_chktime is a multiple of 60
2710                                  * because the parsed value was originally
2711                                  * multiplied by 60 */
2712                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2713                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2714                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2715                                         rc = 1;
2716                                 } else {
2717                                         bv.bv_val = c->cr_msg;
2718                                         value_add_one( &c->rvalue_vals, &bv );
2719                                 }
2720                         } else {
2721                                 rc = 1;
2722                         }
2723                         break;
2724                 case SP_SESSL:
2725                         if ( si->si_logs ) {
2726                                 c->value_int = si->si_logs->sl_size;
2727                         } else {
2728                                 rc = 1;
2729                         }
2730                         break;
2731                 case SP_NOPRES:
2732                         if ( si->si_nopres ) {
2733                                 c->value_int = 1;
2734                         } else {
2735                                 rc = 1;
2736                         }
2737                         break;
2738                 case SP_USEHINT:
2739                         if ( si->si_usehint ) {
2740                                 c->value_int = 1;
2741                         } else {
2742                                 rc = 1;
2743                         }
2744                         break;
2745                 }
2746                 return rc;
2747         } else if ( c->op == LDAP_MOD_DELETE ) {
2748                 switch ( c->type ) {
2749                 case SP_CHKPT:
2750                         si->si_chkops = 0;
2751                         si->si_chktime = 0;
2752                         break;
2753                 case SP_SESSL:
2754                         if ( si->si_logs )
2755                                 si->si_logs->sl_size = 0;
2756                         else
2757                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2758                         break;
2759                 case SP_NOPRES:
2760                         if ( si->si_nopres )
2761                                 si->si_nopres = 0;
2762                         else
2763                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2764                         break;
2765                 case SP_USEHINT:
2766                         if ( si->si_usehint )
2767                                 si->si_usehint = 0;
2768                         else
2769                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2770                         break;
2771                 }
2772                 return rc;
2773         }
2774         switch ( c->type ) {
2775         case SP_CHKPT:
2776                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2777                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2778                                 c->argv[0], c->argv[1] );
2779                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2780                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2781                         return ARG_BAD_CONF;
2782                 }
2783                 if ( si->si_chkops <= 0 ) {
2784                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2785                                 c->argv[0], si->si_chkops );
2786                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2787                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2788                         return ARG_BAD_CONF;
2789                 }
2790                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2791                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2792                                 c->argv[0], c->argv[1] );
2793                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2794                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2795                         return ARG_BAD_CONF;
2796                 }
2797                 if ( si->si_chktime <= 0 ) {
2798                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2799                                 c->argv[0], si->si_chkops );
2800                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2801                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2802                         return ARG_BAD_CONF;
2803                 }
2804                 si->si_chktime *= 60;
2805                 break;
2806         case SP_SESSL: {
2807                 sessionlog *sl;
2808                 int size = c->value_int;
2809
2810                 if ( size < 0 ) {
2811                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2812                                 c->argv[0], size );
2813                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2814                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2815                         return ARG_BAD_CONF;
2816                 }
2817                 sl = si->si_logs;
2818                 if ( !sl ) {
2819                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2820                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2821                         sl->sl_mincsn.bv_len = 0;
2822                         sl->sl_num = 0;
2823                         sl->sl_head = sl->sl_tail = NULL;
2824                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2825                         si->si_logs = sl;
2826                 }
2827                 sl->sl_size = size;
2828                 }
2829                 break;
2830         case SP_NOPRES:
2831                 si->si_nopres = c->value_int;
2832                 break;
2833         case SP_USEHINT:
2834                 si->si_usehint = c->value_int;
2835                 break;
2836         }
2837         return rc;
2838 }
2839
2840 /* ITS#3456 we cannot run this search on the main thread, must use a
2841  * child thread in order to insure we have a big enough stack.
2842  */
2843 static void *
2844 syncprov_db_otask(
2845         void *ptr
2846 )
2847 {
2848         syncprov_findcsn( ptr, FIND_MAXCSN );
2849         return NULL;
2850 }
2851
2852 /* Read any existing contextCSN from the underlying db.
2853  * Then search for any entries newer than that. If no value exists,
2854  * just generate it. Cache whatever result.
2855  */
2856 static int
2857 syncprov_db_open(
2858         BackendDB *be,
2859         ConfigReply *cr
2860 )
2861 {
2862         slap_overinst   *on = (slap_overinst *) be->bd_info;
2863         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2864
2865         Connection conn = { 0 };
2866         OperationBuffer opbuf;
2867         Operation *op;
2868         Entry *e = NULL;
2869         Attribute *a;
2870         int rc;
2871         void *thrctx = NULL;
2872
2873         if ( !SLAP_LASTMOD( be )) {
2874                 Debug( LDAP_DEBUG_ANY,
2875                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2876                 return -1;
2877         }
2878
2879         if ( slapMode & SLAP_TOOL_MODE ) {
2880                 return 0;
2881         }
2882
2883         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2884         if ( rc ) {
2885                 return rc;
2886         }
2887
2888         thrctx = ldap_pvt_thread_pool_context();
2889         connection_fake_init( &conn, &opbuf, thrctx );
2890         op = &opbuf.ob_op;
2891         op->o_bd = be;
2892         op->o_dn = be->be_rootdn;
2893         op->o_ndn = be->be_rootndn;
2894
2895         if ( SLAP_SYNC_SUBENTRY( be )) {
2896                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2897                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2898         } else {
2899                 si->si_contextdn = be->be_nsuffix[0];
2900         }
2901         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2902                 slap_schema.si_ad_contextCSN, 0, &e, on );
2903
2904         if ( e ) {
2905                 ldap_pvt_thread_t tid;
2906
2907                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2908                 if ( a ) {
2909                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2910                         si->si_numcsns = a->a_numvals;
2911                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2912                 }
2913                 overlay_entry_release_ov( op, e, 0, on );
2914                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2915                         op->o_req_dn = be->be_suffix[0];
2916                         op->o_req_ndn = be->be_nsuffix[0];
2917                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2918                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2919                         ldap_pvt_thread_join( tid, NULL );
2920                 }
2921         }
2922
2923         /* Didn't find a contextCSN, should we generate one? */
2924         if ( !si->si_ctxcsn ) {
2925                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2926                 struct berval csn;
2927
2928                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2929                 /* If we're also a consumer, then don't generate anything.
2930                  * Wait for our provider to send it to us, or for a local
2931                  * modify if we have multimaster.
2932                  */
2933                         goto out;
2934                 }
2935                 csn.bv_val = csnbuf;
2936                 csn.bv_len = sizeof( csnbuf );
2937                 slap_get_csn( op, &csn, 0 );
2938                 value_add_one( &si->si_ctxcsn, &csn );
2939                 si->si_numcsns = 1;
2940                 si->si_sids = ch_malloc( sizeof(int) );
2941                 si->si_sids[0] = slap_serverID;
2942
2943                 /* make sure we do a checkpoint on close */
2944                 si->si_numops++;
2945         }
2946
2947 out:
2948         op->o_bd->bd_info = (BackendInfo *)on;
2949         return 0;
2950 }
2951
2952 /* Write the current contextCSN into the underlying db.
2953  */
2954 static int
2955 syncprov_db_close(
2956         BackendDB *be,
2957         ConfigReply *cr
2958 )
2959 {
2960     slap_overinst   *on = (slap_overinst *) be->bd_info;
2961     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2962
2963         if ( slapMode & SLAP_TOOL_MODE ) {
2964                 return 0;
2965         }
2966         if ( si->si_numops ) {
2967                 Connection conn = {0};
2968                 OperationBuffer opbuf;
2969                 Operation *op;
2970                 SlapReply rs = {REP_RESULT};
2971                 void *thrctx;
2972
2973                 thrctx = ldap_pvt_thread_pool_context();
2974                 connection_fake_init( &conn, &opbuf, thrctx );
2975                 op = &opbuf.ob_op;
2976                 op->o_bd = be;
2977                 op->o_dn = be->be_rootdn;
2978                 op->o_ndn = be->be_rootndn;
2979                 syncprov_checkpoint( op, &rs, on );
2980         }
2981
2982     return 0;
2983 }
2984
2985 static int
2986 syncprov_db_init(
2987         BackendDB *be,
2988         ConfigReply *cr
2989 )
2990 {
2991         slap_overinst   *on = (slap_overinst *)be->bd_info;
2992         syncprov_info_t *si;
2993
2994         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2995                 Debug( LDAP_DEBUG_ANY,
2996                         "syncprov must be instantiated within a database.\n",
2997                         0, 0, 0 );
2998                 return 1;
2999         }
3000
3001         si = ch_calloc(1, sizeof(syncprov_info_t));
3002         on->on_bi.bi_private = si;
3003         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3004         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3005         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3006         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3007
3008         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3009         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3010         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3011         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3012
3013         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3014         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3015
3016         return 0;
3017 }
3018
3019 static int
3020 syncprov_db_destroy(
3021         BackendDB *be,
3022         ConfigReply *cr
3023 )
3024 {
3025         slap_overinst   *on = (slap_overinst *)be->bd_info;
3026         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3027
3028         if ( si ) {
3029                 if ( si->si_logs ) {
3030                         slog_entry *se = si->si_logs->sl_head;
3031
3032                         while ( se ) {
3033                                 slog_entry *se_next = se->se_next;
3034                                 ch_free( se );
3035                                 se = se_next;
3036                         }
3037
3038                         ch_free( si->si_logs );
3039                 }
3040                 if ( si->si_ctxcsn )
3041                         ber_bvarray_free( si->si_ctxcsn );
3042                 if ( si->si_sids )
3043                         ch_free( si->si_sids );
3044                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3045                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3046                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3047                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3048                 ch_free( si );
3049         }
3050
3051         return 0;
3052 }
3053
3054 static int syncprov_parseCtrl (
3055         Operation *op,
3056         SlapReply *rs,
3057         LDAPControl *ctrl )
3058 {
3059         ber_tag_t tag;
3060         BerElementBuffer berbuf;
3061         BerElement *ber = (BerElement *)&berbuf;
3062         ber_int_t mode;
3063         ber_len_t len;
3064         struct berval cookie = BER_BVNULL;
3065         sync_control *sr;
3066         int rhint = 0;
3067
3068         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3069                 rs->sr_text = "Sync control specified multiple times";
3070                 return LDAP_PROTOCOL_ERROR;
3071         }
3072
3073         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3074                 rs->sr_text = "Sync control specified with pagedResults control";
3075                 return LDAP_PROTOCOL_ERROR;
3076         }
3077
3078         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3079                 rs->sr_text = "Sync control value is absent";
3080                 return LDAP_PROTOCOL_ERROR;
3081         }
3082
3083         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3084                 rs->sr_text = "Sync control value is empty";
3085                 return LDAP_PROTOCOL_ERROR;
3086         }
3087
3088         /* Parse the control value
3089          *      syncRequestValue ::= SEQUENCE {
3090          *              mode   ENUMERATED {
3091          *                      -- 0 unused
3092          *                      refreshOnly             (1),
3093          *                      -- 2 reserved
3094          *                      refreshAndPersist       (3)
3095          *              },
3096          *              cookie  syncCookie OPTIONAL
3097          *      }
3098          */
3099
3100         ber_init2( ber, &ctrl->ldctl_value, 0 );
3101
3102         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3103                 rs->sr_text = "Sync control : mode decoding error";
3104                 return LDAP_PROTOCOL_ERROR;
3105         }
3106
3107         switch( mode ) {
3108         case LDAP_SYNC_REFRESH_ONLY:
3109                 mode = SLAP_SYNC_REFRESH;
3110                 break;
3111         case LDAP_SYNC_REFRESH_AND_PERSIST:
3112                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3113                 break;
3114         default:
3115                 rs->sr_text = "Sync control : unknown update mode";
3116                 return LDAP_PROTOCOL_ERROR;
3117         }
3118
3119         tag = ber_peek_tag( ber, &len );
3120
3121         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3122                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3123                         rs->sr_text = "Sync control : cookie decoding error";
3124                         return LDAP_PROTOCOL_ERROR;
3125                 }
3126                 tag = ber_peek_tag( ber, &len );
3127         }
3128         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3129                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3130                         rs->sr_text = "Sync control : rhint decoding error";
3131                         return LDAP_PROTOCOL_ERROR;
3132                 }
3133         }
3134         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3135                         rs->sr_text = "Sync control : decoding error";
3136                         return LDAP_PROTOCOL_ERROR;
3137         }
3138         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3139         sr->sr_rhint = rhint;
3140         if (!BER_BVISNULL(&cookie)) {
3141                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3142                 /* If parse fails, pretend no cookie was sent */
3143                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3144                         sr->sr_state.rid == -1 ) {
3145                         if ( sr->sr_state.ctxcsn ) {
3146                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3147                                 sr->sr_state.ctxcsn = NULL;
3148                         }
3149                         sr->sr_state.numcsns = 0;
3150                 }
3151         }
3152
3153         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3154
3155         op->o_sync = ctrl->ldctl_iscritical
3156                 ? SLAP_CONTROL_CRITICAL
3157                 : SLAP_CONTROL_NONCRITICAL;
3158
3159         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3160
3161         return LDAP_SUCCESS;
3162 }
3163
3164 /* This overlay is set up for dynamic loading via moduleload. For static
3165  * configuration, you'll need to arrange for the slap_overinst to be
3166  * initialized and registered by some other function inside slapd.
3167  */
3168
3169 static slap_overinst            syncprov;
3170
3171 int
3172 syncprov_initialize()
3173 {
3174         int rc;
3175
3176         rc = register_supported_control( LDAP_CONTROL_SYNC,
3177                 SLAP_CTRL_SEARCH, NULL,
3178                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3179         if ( rc != LDAP_SUCCESS ) {
3180                 Debug( LDAP_DEBUG_ANY,
3181                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3182                 return rc;
3183         }
3184
3185         syncprov.on_bi.bi_type = "syncprov";
3186         syncprov.on_bi.bi_db_init = syncprov_db_init;
3187         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3188         syncprov.on_bi.bi_db_open = syncprov_db_open;
3189         syncprov.on_bi.bi_db_close = syncprov_db_close;
3190
3191         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3192         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3193
3194         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3195         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3196         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3197         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3198         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3199         syncprov.on_bi.bi_op_search = syncprov_op_search;
3200         syncprov.on_bi.bi_extended = syncprov_op_extended;
3201         syncprov.on_bi.bi_operational = syncprov_operational;
3202
3203         syncprov.on_bi.bi_cf_ocs = spocs;
3204
3205         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3206
3207         rc = config_register_schema( spcfg, spocs );
3208         if ( rc ) return rc;
3209
3210         return overlay_register( &syncprov );
3211 }
3212
3213 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3214 int
3215 init_module( int argc, char *argv[] )
3216 {
3217         return syncprov_initialize();
3218 }
3219 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3220
3221 #endif /* defined(SLAPD_OVER_SYNCPROV) */