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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2009 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74 #define PS_TASK_QUEUED          0x20
  75
  76         int             s_inuse;        /* reference count */
  77         struct syncres *s_res;
  78         struct syncres *s_restail;
  79         ldap_pvt_thread_mutex_t s_mutex;
  80 } syncops;
  81
  82 /* A received sync control */
  83 typedef struct sync_control {
  84         struct sync_cookie sr_state;
  85         int sr_rhint;
  86 } sync_control;
  87
  88 #if 0 /* moved back to slap.h */
  89 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  90 #endif
  91 /* o_sync_mode uses data bits of o_sync */
  92 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  93
  94 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  95 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  98
  99 /* Record of which searches matched at premodify step */
 100 typedef struct syncmatches {
 101         struct syncmatches *sm_next;
 102         syncops *sm_op;
 103 } syncmatches;
 104
 105 /* Session log data */
 106 typedef struct slog_entry {
 107         struct slog_entry *se_next;
 108         struct berval se_uuid;
 109         struct berval se_csn;
 110         int     se_sid;
 111         ber_tag_t       se_tag;
 112 } slog_entry;
 113
 114 typedef struct sessionlog {
 115         struct berval   sl_mincsn;
 116         int             sl_num;
 117         int             sl_size;
 118         slog_entry *sl_head;
 119         slog_entry *sl_tail;
 120         ldap_pvt_thread_mutex_t sl_mutex;
 121 } sessionlog;
 122
 123 /* The main state for this overlay */
 124 typedef struct syncprov_info_t {
 125         syncops         *si_ops;
 126         BerVarray       si_ctxcsn;      /* ldapsync context */
 127         struct berval   si_contextdn;
 128         int             *si_sids;
 129         int             si_numcsns;
 130         int             si_chkops;      /* checkpointing info */
 131         int             si_chktime;
 132         int             si_numops;      /* number of ops since last checkpoint */
 133         int             si_nopres;      /* Skip present phase */
 134         int             si_usehint;     /* use reload hint */
 135         time_t  si_chklast;     /* time of last checkpoint */
 136         Avlnode *si_mods;       /* entries being modified */
 137         sessionlog      *si_logs;
 138         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 139         ldap_pvt_thread_mutex_t si_ops_mutex;
 140         ldap_pvt_thread_mutex_t si_mods_mutex;
 141         ldap_pvt_thread_mutex_t si_resp_mutex;
 142 } syncprov_info_t;
 143
 144 typedef struct opcookie {
 145         slap_overinst *son;
 146         syncmatches *smatches;
 147         modtarget *smt;
 148         struct berval sdn;      /* DN of entry, for deletes */
 149         struct berval sndn;
 150         struct berval suuid;    /* UUID of entry */
 151         struct berval sctxcsn;
 152         short osid;     /* sid of op csn */
 153         short rsid;     /* sid of relay */
 154         short sreference;       /* Is the entry a reference? */
 155 } opcookie;
 156
 157 typedef struct fbase_cookie {
 158         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 159         syncops *fss;   /* persistent search we're testing against */
 160         int fbase;      /* if TRUE we found the search base and it's still valid */
 161         int fscope;     /* if TRUE then fdn is within the psearch scope */
 162 } fbase_cookie;
 163
 164 static AttributeName csn_anlist[3];
 165 static AttributeName uuid_anlist[2];
 166
 167 /* Build a LDAPsync intermediate state control */
 168 static int
 169 syncprov_state_ctrl(
 170         Operation       *op,
 171         SlapReply       *rs,
 172         Entry           *e,
 173         int             entry_sync_state,
 174         LDAPControl     **ctrls,
 175         int             num_ctrls,
 176         int             send_cookie,
 177         struct berval   *cookie )
 178 {
 179         Attribute* a;
 180         int ret;
 181
 182         BerElementBuffer berbuf;
 183         BerElement *ber = (BerElement *)&berbuf;
 184
 185         struct berval   entryuuid_bv = BER_BVNULL;
 186
 187         ber_init2( ber, 0, LBER_USE_DER );
 188         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 189
 190         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 191
 192         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 193                 AttributeDescription *desc = a->a_desc;
 194                 if ( desc == slap_schema.si_ad_entryUUID ) {
 195                         entryuuid_bv = a->a_nvals[0];
 196                         break;
 197                 }
 198         }
 199
 200         /* FIXME: what if entryuuid is NULL or empty ? */
 201
 202         if ( send_cookie && cookie ) {
 203                 ber_printf( ber, "{eOON}",
 204                         entry_sync_state, &entryuuid_bv, cookie );
 205         } else {
 206                 ber_printf( ber, "{eON}",
 207                         entry_sync_state, &entryuuid_bv );
 208         }
 209
 210         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 211         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 212         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 213
 214         ber_free_buf( ber );
 215
 216         if ( ret < 0 ) {
 217                 Debug( LDAP_DEBUG_TRACE,
 218                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 219                         0, 0, 0 );
 220                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 221                 return ret;
 222         }
 223
 224         return LDAP_SUCCESS;
 225 }
 226
 227 /* Build a LDAPsync final state control */
 228 static int
 229 syncprov_done_ctrl(
 230         Operation       *op,
 231         SlapReply       *rs,
 232         LDAPControl     **ctrls,
 233         int                     num_ctrls,
 234         int                     send_cookie,
 235         struct berval *cookie,
 236         int                     refreshDeletes )
 237 {
 238         int ret;
 239         BerElementBuffer berbuf;
 240         BerElement *ber = (BerElement *)&berbuf;
 241
 242         ber_init2( ber, NULL, LBER_USE_DER );
 243         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 244
 245         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 246
 247         ber_printf( ber, "{" );
 248         if ( send_cookie && cookie ) {
 249                 ber_printf( ber, "O", cookie );
 250         }
 251         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 252                 ber_printf( ber, "b", refreshDeletes );
 253         }
 254         ber_printf( ber, "N}" );
 255
 256         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 257         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 258         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 259
 260         ber_free_buf( ber );
 261
 262         if ( ret < 0 ) {
 263                 Debug( LDAP_DEBUG_TRACE,
 264                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 265                         0, 0, 0 );
 266                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 267                 return ret;
 268         }
 269
 270         return LDAP_SUCCESS;
 271 }
 272
 273 static int
 274 syncprov_sendinfo(
 275         Operation       *op,
 276         SlapReply       *rs,
 277         int                     type,
 278         struct berval *cookie,
 279         int                     refreshDone,
 280         BerVarray       syncUUIDs,
 281         int                     refreshDeletes )
 282 {
 283         BerElementBuffer berbuf;
 284         BerElement *ber = (BerElement *)&berbuf;
 285         struct berval rspdata;
 286
 287         int ret;
 288
 289         ber_init2( ber, NULL, LBER_USE_DER );
 290         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 291
 292         if ( type ) {
 293                 switch ( type ) {
 294                 case LDAP_TAG_SYNC_NEW_COOKIE:
 295                         ber_printf( ber, "tO", type, cookie );
 296                         break;
 297                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 298                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 299                         ber_printf( ber, "t{", type );
 300                         if ( cookie ) {
 301                                 ber_printf( ber, "O", cookie );
 302                         }
 303                         if ( refreshDone == 0 ) {
 304                                 ber_printf( ber, "b", refreshDone );
 305                         }
 306                         ber_printf( ber, "N}" );
 307                         break;
 308                 case LDAP_TAG_SYNC_ID_SET:
 309                         ber_printf( ber, "t{", type );
 310                         if ( cookie ) {
 311                                 ber_printf( ber, "O", cookie );
 312                         }
 313                         if ( refreshDeletes == 1 ) {
 314                                 ber_printf( ber, "b", refreshDeletes );
 315                         }
 316                         ber_printf( ber, "[W]", syncUUIDs );
 317                         ber_printf( ber, "N}" );
 318                         break;
 319                 default:
 320                         Debug( LDAP_DEBUG_TRACE,
 321                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 322                                 type, 0, 0 );
 323                         return LDAP_OTHER;
 324                 }
 325         }
 326
 327         ret = ber_flatten2( ber, &rspdata, 0 );
 328
 329         if ( ret < 0 ) {
 330                 Debug( LDAP_DEBUG_TRACE,
 331                         "syncprov_sendinfo: ber_flatten2 failed\n",
 332                         0, 0, 0 );
 333                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 334                 return ret;
 335         }
 336
 337         rs->sr_rspoid = LDAP_SYNC_INFO;
 338         rs->sr_rspdata = &rspdata;
 339         send_ldap_intermediate( op, rs );
 340         rs->sr_rspdata = NULL;
 341         ber_free_buf( ber );
 342
 343         return LDAP_SUCCESS;
 344 }
 345
 346 /* Find a modtarget in an AVL tree */
 347 static int
 348 sp_avl_cmp( const void *c1, const void *c2 )
 349 {
 350         const modtarget *m1, *m2;
 351         int rc;
 352
 353         m1 = c1; m2 = c2;
 354         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 355
 356         if ( rc ) return rc;
 357         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 358 }
 359
 360 /* syncprov_findbase:
 361  *   finds the true DN of the base of a search (with alias dereferencing) and
 362  * checks to make sure the base entry doesn't get replaced with a different
 363  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 364  * change is detected, any persistent search on this base must be terminated /
 365  * reloaded.
 366  *   On the first call, we just save the DN and entryID. On subsequent calls
 367  * we compare the DN and entryID with the saved values.
 368  */
 369 static int
 370 findbase_cb( Operation *op, SlapReply *rs )
 371 {
 372         slap_callback *sc = op->o_callback;
 373
 374         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 375                 fbase_cookie *fc = sc->sc_private;
 376
 377                 /* If no entryID, we're looking for the first time.
 378                  * Just store whatever we got.
 379                  */
 380                 if ( fc->fss->s_eid == NOID ) {
 381                         fc->fbase = 2;
 382                         fc->fss->s_eid = rs->sr_entry->e_id;
 383                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 384
 385                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 386                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 387
 388                 /* OK, the DN is the same and the entryID is the same. */
 389                         fc->fbase = 1;
 390                 }
 391         }
 392         if ( rs->sr_err != LDAP_SUCCESS ) {
 393                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 394         }
 395         return LDAP_SUCCESS;
 396 }
 397
 398 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 399 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 400
 401 static int
 402 syncprov_findbase( Operation *op, fbase_cookie *fc )
 403 {
 404         /* Use basic parameters from syncrepl search, but use
 405          * current op's threadctx / tmpmemctx
 406          */
 407         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 408         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 409                 slap_callback cb = {0};
 410                 Operation fop;
 411                 SlapReply frs = { REP_RESULT };
 412                 int rc;
 413
 414                 fc->fss->s_flags ^= PS_FIND_BASE;
 415                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 416
 417                 fop = *fc->fss->s_op;
 418
 419                 fop.o_bd = fop.o_bd->bd_self;
 420                 fop.o_hdr = op->o_hdr;
 421                 fop.o_time = op->o_time;
 422                 fop.o_tincr = op->o_tincr;
 423
 424                 cb.sc_response = findbase_cb;
 425                 cb.sc_private = fc;
 426
 427                 fop.o_sync_mode = 0;    /* turn off sync mode */
 428                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 429                 fop.o_callback = &cb;
 430                 fop.o_tag = LDAP_REQ_SEARCH;
 431                 fop.ors_scope = LDAP_SCOPE_BASE;
 432                 fop.ors_limit = NULL;
 433                 fop.ors_slimit = 1;
 434                 fop.ors_tlimit = SLAP_NO_LIMIT;
 435                 fop.ors_attrs = slap_anlist_no_attrs;
 436                 fop.ors_attrsonly = 1;
 437                 fop.ors_filter = &generic_filter;
 438                 fop.ors_filterstr = generic_filterstr;
 439
 440                 rc = fop.o_bd->be_search( &fop, &frs );
 441         } else {
 442                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 443                 fc->fbase = 1;
 444         }
 445
 446         /* After the first call, see if the fdn resides in the scope */
 447         if ( fc->fbase == 1 ) {
 448                 switch ( fc->fss->s_op->ors_scope ) {
 449                 case LDAP_SCOPE_BASE:
 450                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 451                         break;
 452                 case LDAP_SCOPE_ONELEVEL: {
 453                         struct berval pdn;
 454                         dnParent( fc->fdn, &pdn );
 455                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 456                         break; }
 457                 case LDAP_SCOPE_SUBTREE:
 458                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 459                         break;
 460                 case LDAP_SCOPE_SUBORDINATE:
 461                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 462                                 !dn_match( fc->fdn, &fc->fss->s_base );
 463                         break;
 464                 }
 465         }
 466
 467         if ( fc->fbase )
 468                 return LDAP_SUCCESS;
 469
 470         /* If entryID has changed, then the base of this search has
 471          * changed. Invalidate the psearch.
 472          */
 473         return LDAP_NO_SUCH_OBJECT;
 474 }
 475
 476 /* syncprov_findcsn:
 477  *   This function has three different purposes, but they all use a search
 478  * that filters on entryCSN so they're combined here.
 479  * 1: at startup time, after a contextCSN has been read from the database,
 480  * we search for all entries with CSN >= contextCSN in case the contextCSN
 481  * was not checkpointed at the previous shutdown.
 482  *
 483  * 2: when the current contextCSN is known and we have a sync cookie, we search
 484  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 485  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 486  *
 487  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 488  * CSN, and generate Present records for them. We always collect this result
 489  * in SyncID sets, even if there's only one match.
 490  */
 491 typedef enum find_csn_t {
 492         FIND_MAXCSN     = 1,
 493         FIND_CSN        = 2,
 494         FIND_PRESENT    = 3
 495 } find_csn_t;
 496
 497 static int
 498 findmax_cb( Operation *op, SlapReply *rs )
 499 {
 500         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 501                 struct berval *maxcsn = op->o_callback->sc_private;
 502                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 503                         slap_schema.si_ad_entryCSN );
 504
 505                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 506                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 507                         maxcsn->bv_len = a->a_vals[0].bv_len;
 508                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 509                 }
 510         }
 511         return LDAP_SUCCESS;
 512 }
 513
 514 static int
 515 findcsn_cb( Operation *op, SlapReply *rs )
 516 {
 517         slap_callback *sc = op->o_callback;
 518
 519         /* We just want to know that at least one exists, so it's OK if
 520          * we exceed the unchecked limit.
 521          */
 522         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 523                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 524                 sc->sc_private = (void *)1;
 525         }
 526         return LDAP_SUCCESS;
 527 }
 528
 529 /* Build a list of entryUUIDs for sending in a SyncID set */
 530
 531 #define UUID_LEN        16
 532
 533 typedef struct fpres_cookie {
 534         int num;
 535         BerVarray uuids;
 536         char *last;
 537 } fpres_cookie;
 538
 539 static int
 540 findpres_cb( Operation *op, SlapReply *rs )
 541 {
 542         slap_callback *sc = op->o_callback;
 543         fpres_cookie *pc = sc->sc_private;
 544         Attribute *a;
 545         int ret = SLAP_CB_CONTINUE;
 546
 547         switch ( rs->sr_type ) {
 548         case REP_SEARCH:
 549                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 550                 if ( a ) {
 551                         pc->uuids[pc->num].bv_val = pc->last;
 552                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 553                                 pc->uuids[pc->num].bv_len );
 554                         pc->num++;
 555                         pc->last = pc->uuids[pc->num].bv_val;
 556                         pc->uuids[pc->num].bv_val = NULL;
 557                 }
 558                 ret = LDAP_SUCCESS;
 559                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 560                         break;
 561                 /* FALLTHRU */
 562         case REP_RESULT:
 563                 ret = rs->sr_err;
 564                 if ( pc->num ) {
 565                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 566                                 0, pc->uuids, 0 );
 567                         pc->uuids[pc->num].bv_val = pc->last;
 568                         pc->num = 0;
 569                         pc->last = pc->uuids[0].bv_val;
 570                 }
 571                 break;
 572         default:
 573                 break;
 574         }
 575         return ret;
 576 }
 577
 578 static int
 579 syncprov_findcsn( Operation *op, find_csn_t mode )
 580 {
 581         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 582         syncprov_info_t         *si = on->on_bi.bi_private;
 583
 584         slap_callback cb = {0};
 585         Operation fop;
 586         SlapReply frs = { REP_RESULT };
 587         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 588         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 589         struct berval maxcsn;
 590         Filter cf;
 591         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 592         fpres_cookie pcookie;
 593         sync_control *srs = NULL;
 594         struct slap_limits_set fc_limits;
 595         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 596         int maxid;
 597
 598         if ( mode != FIND_MAXCSN ) {
 599                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 600         }
 601
 602         fop = *op;
 603         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 604         /* We want pure entries, not referrals */
 605         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 606
 607         cf.f_ava = &eq;
 608         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 609         BER_BVZERO( &cf.f_av_value );
 610         cf.f_next = NULL;
 611
 612         fop.o_callback = &cb;
 613         fop.ors_limit = NULL;
 614         fop.ors_tlimit = SLAP_NO_LIMIT;
 615         fop.ors_filter = &cf;
 616         fop.ors_filterstr.bv_val = buf;
 617
 618 again:
 619         switch( mode ) {
 620         case FIND_MAXCSN:
 621                 cf.f_choice = LDAP_FILTER_GE;
 622                 /* If there are multiple CSNs, use the one with our serverID */
 623                 for ( i=0; i<si->si_numcsns; i++) {
 624                         if ( slap_serverID == si->si_sids[i] ) {
 625                                 maxid = i;
 626                                 break;
 627                         }
 628                 }
 629                 if ( i == si->si_numcsns ) {
 630                         /* No match: this is multimaster, and none of the content in the DB
 631                          * originated locally. Treat like no CSN.
 632                          */
 633                         return LDAP_NO_SUCH_OBJECT;
 634                 }
 635                 cf.f_av_value = si->si_ctxcsn[maxid];
 636                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 637                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 638                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 639                         return LDAP_OTHER;
 640                 }
 641                 fop.ors_attrsonly = 0;
 642                 fop.ors_attrs = csn_anlist;
 643                 fop.ors_slimit = SLAP_NO_LIMIT;
 644                 cb.sc_private = &maxcsn;
 645                 cb.sc_response = findmax_cb;
 646                 strcpy( cbuf, cf.f_av_value.bv_val );
 647                 maxcsn.bv_val = cbuf;
 648                 maxcsn.bv_len = cf.f_av_value.bv_len;
 649                 break;
 650         case FIND_CSN:
 651                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 652                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 653                         /* If there are multiple CSNs, use the smallest */
 654                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 655                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 656                                         > 0 ) {
 657                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 658                                 }
 659                         }
 660                 }
 661                 /* Look for exact match the first time */
 662                 if ( findcsn_retry ) {
 663                         cf.f_choice = LDAP_FILTER_EQUALITY;
 664                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 665                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 666                 /* On retry, look for <= */
 667                 } else {
 668                         cf.f_choice = LDAP_FILTER_LE;
 669                         fop.ors_limit = &fc_limits;
 670                         memset( &fc_limits, 0, sizeof( fc_limits ));
 671                         fc_limits.lms_s_unchecked = 1;
 672                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 673                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 674                 }
 675                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 676                         return LDAP_OTHER;
 677                 }
 678                 fop.ors_attrsonly = 1;
 679                 fop.ors_attrs = slap_anlist_no_attrs;
 680                 fop.ors_slimit = 1;
 681                 cb.sc_private = NULL;
 682                 cb.sc_response = findcsn_cb;
 683                 break;
 684         case FIND_PRESENT:
 685                 fop.ors_filter = op->ors_filter;
 686                 fop.ors_filterstr = op->ors_filterstr;
 687                 fop.ors_attrsonly = 0;
 688                 fop.ors_attrs = uuid_anlist;
 689                 fop.ors_slimit = SLAP_NO_LIMIT;
 690                 cb.sc_private = &pcookie;
 691                 cb.sc_response = findpres_cb;
 692                 pcookie.num = 0;
 693
 694                 /* preallocate storage for a full set */
 695                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 696                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 697                         op->o_tmpmemctx );
 698                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 699                 pcookie.uuids[0].bv_val = pcookie.last;
 700                 pcookie.uuids[0].bv_len = UUID_LEN;
 701                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 702                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 703                         pcookie.uuids[i].bv_len = UUID_LEN;
 704                 }
 705                 break;
 706         }
 707
 708         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 709         fop.o_bd->be_search( &fop, &frs );
 710         fop.o_bd->bd_info = (BackendInfo *)on;
 711
 712         switch( mode ) {
 713         case FIND_MAXCSN:
 714                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 715 #ifdef CHECK_CSN
 716                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 717                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 718 #endif
 719                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 720                         si->si_numops++;        /* ensure a checkpoint */
 721                 }
 722                 break;
 723         case FIND_CSN:
 724                 /* If matching CSN was not found, invalidate the context. */
 725                 if ( !cb.sc_private ) {
 726                         /* If we didn't find an exact match, then try for <= */
 727                         if ( findcsn_retry ) {
 728                                 findcsn_retry = 0;
 729                                 goto again;
 730                         }
 731                         rc = LDAP_NO_SUCH_OBJECT;
 732                 }
 733                 break;
 734         case FIND_PRESENT:
 735                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 736                 break;
 737         }
 738
 739         return rc;
 740 }
 741
 742 static void
 743 syncprov_free_syncop( syncops *so )
 744 {
 745         syncres *sr, *srnext;
 746         GroupAssertion *ga, *gnext;
 747
 748         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 749         if ( --so->s_inuse > 0 ) {
 750                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 751                 return;
 752         }
 753         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 754         if ( so->s_flags & PS_IS_DETACHED ) {
 755                 filter_free( so->s_op->ors_filter );
 756                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 757                         gnext = ga->ga_next;
 758                         ch_free( ga );
 759                 }
 760                 ch_free( so->s_op );
 761         }
 762         ch_free( so->s_base.bv_val );
 763         for ( sr=so->s_res; sr; sr=srnext ) {
 764                 srnext = sr->s_next;
 765                 ch_free( sr );
 766         }
 767         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 768         ch_free( so );
 769 }
 770
 771 /* Send a persistent search response */
 772 static int
 773 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 774         Entry **e, int mode )
 775 {
 776         slap_overinst *on = opc->son;
 777
 778         SlapReply rs = { REP_SEARCH };
 779         LDAPControl *ctrls[2];
 780         struct berval cookie = BER_BVNULL, csns[2];
 781         Entry e_uuid = {0};
 782         Attribute a_uuid = {0};
 783
 784         if ( so->s_op->o_abandon )
 785                 return SLAPD_ABANDON;
 786
 787         ctrls[1] = NULL;
 788         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 789                 csns[0] = opc->sctxcsn;
 790                 BER_BVZERO( &csns[1] );
 791                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 792         }
 793
 794 #ifdef LDAP_DEBUG
 795         if ( !BER_BVISNULL( &cookie )) {
 796                 if ( so->s_sid > 0 ) {
 797                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 798                                 so->s_sid, cookie.bv_val , 0 );
 799                 } else {
 800                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 801                                 cookie.bv_val, 0, 0 );
 802                 }
 803         }
 804 #endif
 805
 806         e_uuid.e_attrs = &a_uuid;
 807         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 808         a_uuid.a_nvals = &opc->suuid;
 809         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 810                 mode, ctrls, 0, 1, &cookie );
 811         if ( !BER_BVISNULL( &cookie )) {
 812                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 813         }
 814
 815         rs.sr_ctrls = ctrls;
 816         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 817         switch( mode ) {
 818         case LDAP_SYNC_ADD:
 819                 rs.sr_entry = *e;
 820                 if ( rs.sr_entry->e_private )
 821                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 822                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 823                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 824                         rs.sr_err = send_search_reference( op, &rs );
 825                         ber_bvarray_free( rs.sr_ref );
 826                         if ( !rs.sr_entry )
 827                                 *e = NULL;
 828                         break;
 829                 }
 830                 /* fallthru */
 831         case LDAP_SYNC_MODIFY:
 832                 rs.sr_entry = *e;
 833                 if ( rs.sr_entry->e_private )
 834                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 835                 rs.sr_attrs = op->ors_attrs;
 836                 rs.sr_err = send_search_entry( op, &rs );
 837                 if ( !rs.sr_entry )
 838                         *e = NULL;
 839                 break;
 840         case LDAP_SYNC_DELETE:
 841                 e_uuid.e_attrs = NULL;
 842                 e_uuid.e_name = opc->sdn;
 843                 e_uuid.e_nname = opc->sndn;
 844                 rs.sr_entry = &e_uuid;
 845                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 846                         struct berval bv = BER_BVNULL;
 847                         rs.sr_ref = &bv;
 848                         rs.sr_err = send_search_reference( op, &rs );
 849                 } else {
 850                         rs.sr_err = send_search_entry( op, &rs );
 851                 }
 852                 break;
 853         default:
 854                 assert(0);
 855         }
 856         /* In case someone else freed it already? */
 857         if ( rs.sr_ctrls ) {
 858                 int i;
 859                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 860                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 861                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 862                                 ctrls[0]->ldctl_value.bv_val = NULL;
 863                                 break;
 864                         }
 865                 }
 866                 rs.sr_ctrls = NULL;
 867         }
 868
 869         return rs.sr_err;
 870 }
 871
 872 static void
 873 syncprov_qstart( syncops *so );
 874
 875 /* Play back queued responses */
 876 static int
 877 syncprov_qplay( Operation *op, syncops *so )
 878 {
 879         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 880         syncres *sr;
 881         Entry *e;
 882         opcookie opc;
 883         int rc = 0;
 884
 885         opc.son = on;
 886
 887         do {
 888                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 889                 sr = so->s_res;
 890                 if ( sr )
 891                         so->s_res = sr->s_next;
 892                 if ( !so->s_res )
 893                         so->s_restail = NULL;
 894                 /* Exit loop with mutex held */
 895                 if ( !sr || so->s_op->o_abandon )
 896                         break;
 897                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 898
 899                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 900                     SlapReply rs = { REP_INTERMEDIATE };
 901
 902                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 903                                 &sr->s_csn, 0, NULL, 0 );
 904                 } else {
 905                         opc.sdn = sr->s_dn;
 906                         opc.sndn = sr->s_ndn;
 907                         opc.suuid = sr->s_uuid;
 908                         opc.sctxcsn = sr->s_csn;
 909                         opc.sreference = sr->s_isreference;
 910                         e = NULL;
 911
 912                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 913                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 914                                 if ( rc ) {
 915                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 916                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 917                                         ch_free( sr );
 918                                         rc = 0;
 919                                         continue;
 920                                 }
 921                         }
 922                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 923
 924                         if ( e ) {
 925                                 overlay_entry_release_ov( op, e, 0, on );
 926                         }
 927                 }
 928
 929                 ch_free( sr );
 930
 931                 /* Exit loop with mutex held */
 932                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 933
 934         } while (0);
 935
 936         /* We now only send one change at a time, to prevent one
 937          * psearch from hogging all the CPU. Resubmit this task if
 938          * there are more responses queued and no errors occurred.
 939          */
 940
 941         if ( rc == 0 && so->s_res ) {
 942                 syncprov_qstart( so );
 943         } else {
 944                 so->s_flags ^= PS_TASK_QUEUED;
 945         }
 946
 947         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 948         return rc;
 949 }
 950
 951 /* task for playing back queued responses */
 952 static void *
 953 syncprov_qtask( void *ctx, void *arg )
 954 {
 955         syncops *so = arg;
 956         OperationBuffer opbuf;
 957         Operation *op;
 958         BackendDB be;
 959         int rc;
 960
 961         op = &opbuf.ob_op;
 962         *op = *so->s_op;
 963         op->o_hdr = &opbuf.ob_hdr;
 964         op->o_controls = opbuf.ob_controls;
 965         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 966
 967         *op->o_hdr = *so->s_op->o_hdr;
 968
 969         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 970         op->o_tmpmfuncs = &slap_sl_mfuncs;
 971         op->o_threadctx = ctx;
 972
 973         /* syncprov_qplay expects a fake db */
 974         be = *so->s_op->o_bd;
 975         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 976         op->o_bd = &be;
 977         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 978         op->o_callback = NULL;
 979
 980         rc = syncprov_qplay( op, so );
 981
 982         /* decrement use count... */
 983         syncprov_free_syncop( so );
 984
 985         return NULL;
 986 }
 987
 988 /* Start the task to play back queued psearch responses */
 989 static void
 990 syncprov_qstart( syncops *so )
 991 {
 992         so->s_flags |= PS_TASK_QUEUED;
 993         so->s_inuse++;
 994         ldap_pvt_thread_pool_submit( &connection_pool,
 995                 syncprov_qtask, so );
 996 }
 997
 998 /* Queue a persistent search response */
 999 static int
1000 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1001 {
1002         syncres *sr;
1003         int srsize;
1004         struct berval cookie = opc->sctxcsn;
1005
1006         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1007                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1008
1009                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1010                         so->s_rid, slap_serverID ? slap_serverID : -1);
1011         }
1012
1013         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1014                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1015         if ( cookie.bv_len )
1016                 srsize += cookie.bv_len + 1;
1017         sr = ch_malloc( srsize );
1018         sr->s_next = NULL;
1019         sr->s_dn.bv_val = (char *)(sr + 1);
1020         sr->s_dn.bv_len = opc->sdn.bv_len;
1021         sr->s_mode = mode;
1022         sr->s_isreference = opc->sreference;
1023         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1024                  opc->sdn.bv_val ) + 1;
1025         sr->s_ndn.bv_len = opc->sndn.bv_len;
1026         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1027                  opc->sndn.bv_val ) + 1;
1028         sr->s_uuid.bv_len = opc->suuid.bv_len;
1029         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1030         if ( cookie.bv_len ) {
1031                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1032                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1033         } else {
1034                 sr->s_csn.bv_val = NULL;
1035         }
1036         sr->s_csn.bv_len = cookie.bv_len;
1037
1038         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1039                 ch_free( cookie.bv_val );
1040         }
1041
1042         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1043         if ( !so->s_res ) {
1044                 so->s_res = sr;
1045         } else {
1046                 so->s_restail->s_next = sr;
1047         }
1048         so->s_restail = sr;
1049
1050         /* If the base of the psearch was modified, check it next time round */
1051         if ( so->s_flags & PS_WROTE_BASE ) {
1052                 so->s_flags ^= PS_WROTE_BASE;
1053                 so->s_flags |= PS_FIND_BASE;
1054         }
1055         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1056                 syncprov_qstart( so );
1057         }
1058         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1059         return LDAP_SUCCESS;
1060 }
1061
1062 static int
1063 syncprov_drop_psearch( syncops *so, int lock )
1064 {
1065         if ( so->s_flags & PS_IS_DETACHED ) {
1066                 if ( lock )
1067                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1068                 so->s_op->o_conn->c_n_ops_executing--;
1069                 so->s_op->o_conn->c_n_ops_completed++;
1070                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1071                         o_next );
1072                 if ( lock )
1073                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1074         }
1075         syncprov_free_syncop( so );
1076
1077         return 0;
1078 }
1079
1080 static int
1081 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1082 {
1083         slap_callback *sc = op->o_callback;
1084         op->o_callback = sc->sc_next;
1085         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1086         op->o_tmpfree( sc, op->o_tmpmemctx );
1087         return 0;
1088 }
1089
1090 static int
1091 syncprov_op_abandon( Operation *op, SlapReply *rs )
1092 {
1093         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1094         syncprov_info_t         *si = on->on_bi.bi_private;
1095         syncops *so, *soprev;
1096
1097         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1098         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1099                 soprev=so, so=so->s_next ) {
1100                 if ( so->s_op->o_connid == op->o_connid &&
1101                         so->s_op->o_msgid == op->orn_msgid ) {
1102                                 so->s_op->o_abandon = 1;
1103                                 soprev->s_next = so->s_next;
1104                                 break;
1105                 }
1106         }
1107         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1108         if ( so ) {
1109                 /* Is this really a Cancel exop? */
1110                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1111                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1112                         rs->sr_err = LDAP_CANCELLED;
1113                         send_ldap_result( so->s_op, rs );
1114                         if ( so->s_flags & PS_IS_DETACHED ) {
1115                                 slap_callback *cb;
1116                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1117                                 cb->sc_cleanup = syncprov_ab_cleanup;
1118                                 cb->sc_next = op->o_callback;
1119                                 cb->sc_private = so;
1120                                 return SLAP_CB_CONTINUE;
1121                         }
1122                 }
1123                 syncprov_drop_psearch( so, 0 );
1124         }
1125         return SLAP_CB_CONTINUE;
1126 }
1127
1128 /* Find which persistent searches are affected by this operation */
1129 static void
1130 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1131 {
1132         slap_overinst *on = opc->son;
1133         syncprov_info_t         *si = on->on_bi.bi_private;
1134
1135         fbase_cookie fc;
1136         syncops *ss, *sprev, *snext;
1137         Entry *e = NULL;
1138         Attribute *a;
1139         int rc;
1140         struct berval newdn;
1141         int freefdn = 0;
1142         BackendDB *b0 = op->o_bd, db;
1143
1144         fc.fdn = &op->o_req_ndn;
1145         /* compute new DN */
1146         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1147                 struct berval pdn;
1148                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1149                 else dnParent( fc.fdn, &pdn );
1150                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1151                 fc.fdn = &newdn;
1152                 freefdn = 1;
1153         }
1154         if ( op->o_tag != LDAP_REQ_ADD ) {
1155                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1156                         db = *op->o_bd;
1157                         op->o_bd = &db;
1158                 }
1159                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1160                 /* If we're sending responses now, make a copy and unlock the DB */
1161                 if ( e && !saveit ) {
1162                         Entry *e2 = entry_dup( e );
1163                         overlay_entry_release_ov( op, e, 0, on );
1164                         e = e2;
1165                 }
1166                 if ( rc ) {
1167                         op->o_bd = b0;
1168                         return;
1169                 }
1170         } else {
1171                 e = op->ora_e;
1172         }
1173
1174         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1175                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1176                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1177                 opc->sreference = is_entry_referral( e );
1178                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1179                 if ( a )
1180                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1181         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1182                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1183                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1184                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1185                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1186         }
1187
1188         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1189         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1190                 sprev = ss, ss=snext)
1191         {
1192                 Operation op2;
1193                 Opheader oh;
1194                 syncmatches *sm;
1195                 int found = 0;
1196
1197                 snext = ss->s_next;
1198                 if ( ss->s_op->o_abandon )
1199                         continue;
1200
1201                 /* First time thru, check for possible skips */
1202                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1203
1204                         /* Don't send ops back to the originator */
1205                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1206                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1207                                         opc->osid, 0, 0 );
1208                                 continue;
1209                         }
1210
1211                         /* Don't send ops back to the messenger */
1212                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1213                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1214                                         opc->rsid, 0, 0 );
1215                                 continue;
1216                         }
1217                 }
1218
1219                 /* validate base */
1220                 fc.fss = ss;
1221                 fc.fbase = 0;
1222                 fc.fscope = 0;
1223
1224                 /* If the base of the search is missing, signal a refresh */
1225                 rc = syncprov_findbase( op, &fc );
1226                 if ( rc != LDAP_SUCCESS ) {
1227                         SlapReply rs = {REP_RESULT};
1228                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1229                                 "search base has changed" );
1230                         sprev->s_next = snext;
1231                         syncprov_drop_psearch( ss, 1 );
1232                         ss = sprev;
1233                         continue;
1234                 }
1235
1236
1237                 /* If we're sending results now, look for this op in old matches */
1238                 if ( !saveit ) {
1239                         syncmatches *old;
1240
1241                         /* Did we modify the search base? */
1242                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1243                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1244                                 ss->s_flags |= PS_WROTE_BASE;
1245                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1246                         }
1247
1248                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1249                                 old=sm, sm=sm->sm_next ) {
1250                                 if ( sm->sm_op == ss ) {
1251                                         found = 1;
1252                                         old->sm_next = sm->sm_next;
1253                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1254                                         break;
1255                                 }
1256                         }
1257                 }
1258
1259                 if ( fc.fscope ) {
1260                         op2 = *ss->s_op;
1261                         oh = *op->o_hdr;
1262                         oh.oh_conn = ss->s_op->o_conn;
1263                         oh.oh_connid = ss->s_op->o_connid;
1264                         op2.o_bd = op->o_bd->bd_self;
1265                         op2.o_hdr = &oh;
1266                         op2.o_extra = op->o_extra;
1267                         op2.o_callback = NULL;
1268                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1269                 }
1270
1271                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1272                         ss->s_sid, fc.fscope, rc );
1273
1274                 /* check if current o_req_dn is in scope and matches filter */
1275                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1276                         if ( saveit ) {
1277                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1278                                 sm->sm_next = opc->smatches;
1279                                 sm->sm_op = ss;
1280                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1281                                 ++ss->s_inuse;
1282                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1283                                 opc->smatches = sm;
1284                         } else {
1285                                 /* if found send UPDATE else send ADD */
1286                                 syncprov_qresp( opc, ss,
1287                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1288                         }
1289                 } else if ( !saveit && found ) {
1290                         /* send DELETE */
1291                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1292                 } else if ( !saveit ) {
1293                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1294                 }
1295                 if ( !saveit && found ) {
1296                         /* Decrement s_inuse, was incremented when called
1297                          * with saveit == TRUE
1298                          */
1299                         syncprov_free_syncop( ss );
1300                 }
1301         }
1302         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1303
1304         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1305                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1306                         op->o_bd = &db;
1307                 }
1308                 overlay_entry_release_ov( op, e, 0, on );
1309                 op->o_bd = b0;
1310         }
1311         if ( freefdn ) {
1312                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1313         }
1314         op->o_bd = b0;
1315 }
1316
1317 static int
1318 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1319 {
1320         slap_callback *cb = op->o_callback;
1321         opcookie *opc = cb->sc_private;
1322         slap_overinst *on = opc->son;
1323         syncprov_info_t         *si = on->on_bi.bi_private;
1324         syncmatches *sm, *snext;
1325         modtarget *mt, mtdummy;
1326
1327         for (sm = opc->smatches; sm; sm=snext) {
1328                 snext = sm->sm_next;
1329                 syncprov_free_syncop( sm->sm_op );
1330                 op->o_tmpfree( sm, op->o_tmpmemctx );
1331         }
1332
1333         /* Remove op from lock table */
1334         mt = opc->smt;
1335         if ( mt ) {
1336                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1337                 mt->mt_mods = mt->mt_mods->mi_next;
1338                 /* If there are more, promote the next one */
1339                 if ( mt->mt_mods ) {
1340                         mt->mt_op = mt->mt_mods->mi_op;
1341                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1342                 } else {
1343                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1344                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1345                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1346                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1347                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1348                         ch_free( mt );
1349                 }
1350         }
1351         if ( !BER_BVISNULL( &opc->suuid ))
1352                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1353         if ( !BER_BVISNULL( &opc->sndn ))
1354                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1355         if ( !BER_BVISNULL( &opc->sdn ))
1356                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1357         op->o_callback = cb->sc_next;
1358         op->o_tmpfree(cb, op->o_tmpmemctx);
1359
1360         return 0;
1361 }
1362
1363 static void
1364 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1365 {
1366         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1367         Modifications mod;
1368         Operation opm;
1369         SlapReply rsm = { 0 };
1370         slap_callback cb = {0};
1371         BackendDB be;
1372
1373 #ifdef CHECK_CSN
1374         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1375
1376         int i;
1377         for ( i=0; i<si->si_numcsns; i++ ) {
1378                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1379         }
1380 #endif
1381         mod.sml_numvals = si->si_numcsns;
1382         mod.sml_values = si->si_ctxcsn;
1383         mod.sml_nvalues = NULL;
1384         mod.sml_desc = slap_schema.si_ad_contextCSN;
1385         mod.sml_op = LDAP_MOD_REPLACE;
1386         mod.sml_flags = SLAP_MOD_INTERNAL;
1387         mod.sml_next = NULL;
1388
1389         cb.sc_response = slap_null_cb;
1390         opm = *op;
1391         opm.o_tag = LDAP_REQ_MODIFY;
1392         opm.o_callback = &cb;
1393         opm.orm_modlist = &mod;
1394         opm.orm_no_opattrs = 1;
1395         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1396                 be = *on->on_info->oi_origdb;
1397                 opm.o_bd = &be;
1398         }
1399         opm.o_req_dn = si->si_contextdn;
1400         opm.o_req_ndn = si->si_contextdn;
1401         opm.o_bd->bd_info = on->on_info->oi_orig;
1402         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1403         opm.o_no_schema_check = 1;
1404         opm.o_bd->be_modify( &opm, &rsm );
1405
1406         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1407                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1408                 const char      *text;
1409                 char txtbuf[SLAP_TEXT_BUFLEN];
1410                 size_t textlen = sizeof txtbuf;
1411                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1412                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1413                 opm.ora_e = e;
1414                 opm.o_bd->be_add( &opm, &rsm );
1415                 if ( e == opm.ora_e )
1416                         be_entry_release_w( &opm, opm.ora_e );
1417         }
1418
1419         if ( mod.sml_next != NULL ) {
1420                 slap_mods_free( mod.sml_next, 1 );
1421         }
1422 #ifdef CHECK_CSN
1423         for ( i=0; i<si->si_numcsns; i++ ) {
1424                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1425         }
1426 #endif
1427 }
1428
1429 static void
1430 syncprov_add_slog( Operation *op )
1431 {
1432         opcookie *opc = op->o_callback->sc_private;
1433         slap_overinst *on = opc->son;
1434         syncprov_info_t         *si = on->on_bi.bi_private;
1435         sessionlog *sl;
1436         slog_entry *se;
1437
1438         sl = si->si_logs;
1439         {
1440                 /* Allocate a record. UUIDs are not NUL-terminated. */
1441                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1442                         op->o_csn.bv_len + 1 );
1443                 se->se_next = NULL;
1444                 se->se_tag = op->o_tag;
1445
1446                 se->se_uuid.bv_val = (char *)(&se[1]);
1447                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1448                 se->se_uuid.bv_len = opc->suuid.bv_len;
1449
1450                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1451                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1452                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1453                 se->se_csn.bv_len = op->o_csn.bv_len;
1454                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1455
1456                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1457                 if ( sl->sl_head ) {
1458                         sl->sl_tail->se_next = se;
1459                 } else {
1460                         sl->sl_head = se;
1461                 }
1462                 sl->sl_tail = se;
1463                 sl->sl_num++;
1464                 while ( sl->sl_num > sl->sl_size ) {
1465                         se = sl->sl_head;
1466                         sl->sl_head = se->se_next;
1467                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1468                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1469                         ch_free( se );
1470                         sl->sl_num--;
1471                 }
1472                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1473         }
1474 }
1475
1476 /* Just set a flag if we found the matching entry */
1477 static int
1478 playlog_cb( Operation *op, SlapReply *rs )
1479 {
1480         if ( rs->sr_type == REP_SEARCH ) {
1481                 op->o_callback->sc_private = (void *)1;
1482         }
1483         return rs->sr_err;
1484 }
1485
1486 /* enter with sl->sl_mutex locked, release before returning */
1487 static void
1488 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1489         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1490 {
1491         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1492         slog_entry *se;
1493         int i, j, ndel, num, nmods, mmods;
1494         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1495         BerVarray uuids;
1496         struct berval delcsn[2];
1497
1498         if ( !sl->sl_num ) {
1499                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1500                 return;
1501         }
1502
1503         num = sl->sl_num;
1504         i = 0;
1505         nmods = 0;
1506
1507         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1508                 num * UUID_LEN, op->o_tmpmemctx );
1509         uuids[0].bv_val = (char *)(uuids + num + 1);
1510
1511         delcsn[0].bv_len = 0;
1512         delcsn[0].bv_val = cbuf;
1513         BER_BVZERO(&delcsn[1]);
1514
1515         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1516          * and everything else at the end. Do this first so we can
1517          * unlock the list mutex.
1518          */
1519         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1520                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1521         for ( se=sl->sl_head; se; se=se->se_next ) {
1522                 int k;
1523                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1524                 ndel = 1;
1525                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1526                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1527                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1528                                 break;
1529                         }
1530                 }
1531                 if ( ndel <= 0 ) {
1532                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1533                         continue;
1534                 }
1535                 ndel = 0;
1536                 for ( k=0; k<numcsns; k++ ) {
1537                         if ( se->se_sid == sids[k] ) {
1538                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1539                                 break;
1540                         }
1541                 }
1542                 if ( ndel > 0 ) {
1543                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1544                         break;
1545                 }
1546                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1547                         j = i;
1548                         i++;
1549                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1550                         delcsn[0].bv_len = se->se_csn.bv_len;
1551                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1552                 } else {
1553                         nmods++;
1554                         j = num - nmods;
1555                 }
1556                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1557                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1558                 uuids[j].bv_len = UUID_LEN;
1559         }
1560         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1561
1562         ndel = i;
1563
1564         /* Zero out unused slots */
1565         for ( i=ndel; i < num - nmods; i++ )
1566                 uuids[i].bv_len = 0;
1567
1568         /* Mods must be validated to see if they belong in this delete set.
1569          */
1570
1571         mmods = nmods;
1572         /* Strip any duplicates */
1573         for ( i=0; i<nmods; i++ ) {
1574                 for ( j=0; j<ndel; j++ ) {
1575                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1576                                 uuids[num - 1 - i].bv_len = 0;
1577                                 mmods --;
1578                                 break;
1579                         }
1580                 }
1581                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1582                 for ( j=0; j<i; j++ ) {
1583                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1584                                 uuids[num - 1 - i].bv_len = 0;
1585                                 mmods --;
1586                                 break;
1587                         }
1588                 }
1589         }
1590
1591         if ( mmods ) {
1592                 Operation fop;
1593                 SlapReply frs = { REP_RESULT };
1594                 int rc;
1595                 Filter mf, af;
1596                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1597                 slap_callback cb = {0};
1598
1599                 fop = *op;
1600
1601                 fop.o_sync_mode = 0;
1602                 fop.o_callback = &cb;
1603                 fop.ors_limit = NULL;
1604                 fop.ors_tlimit = SLAP_NO_LIMIT;
1605                 fop.ors_attrs = slap_anlist_all_attributes;
1606                 fop.ors_attrsonly = 0;
1607                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1608
1609                 af.f_choice = LDAP_FILTER_AND;
1610                 af.f_next = NULL;
1611                 af.f_and = &mf;
1612                 mf.f_choice = LDAP_FILTER_EQUALITY;
1613                 mf.f_ava = &eq;
1614                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1615                 mf.f_next = fop.ors_filter;
1616
1617                 fop.ors_filter = &af;
1618
1619                 cb.sc_response = playlog_cb;
1620                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1621
1622                 for ( i=ndel; i<num; i++ ) {
1623                         if ( uuids[i].bv_len == 0 ) continue;
1624
1625                         mf.f_av_value = uuids[i];
1626                         cb.sc_private = NULL;
1627                         fop.ors_slimit = 1;
1628                         frs.sr_nentries = 0;
1629                         rc = fop.o_bd->be_search( &fop, &frs );
1630
1631                         /* If entry was not found, add to delete list */
1632                         if ( !cb.sc_private ) {
1633                                 uuids[ndel++] = uuids[i];
1634                         }
1635                 }
1636                 fop.o_bd->bd_info = (BackendInfo *)on;
1637         }
1638         if ( ndel ) {
1639                 struct berval cookie;
1640
1641                 if ( delcsn[0].bv_len ) {
1642                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1643                                 slap_serverID ? slap_serverID : -1 );
1644
1645                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1646                 }
1647
1648                 uuids[ndel].bv_val = NULL;
1649                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1650                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1651                 if ( delcsn[0].bv_len ) {
1652                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1653                 }
1654         }
1655         op->o_tmpfree( uuids, op->o_tmpmemctx );
1656 }
1657
1658 static int
1659 syncprov_op_response( Operation *op, SlapReply *rs )
1660 {
1661         opcookie *opc = op->o_callback->sc_private;
1662         slap_overinst *on = opc->son;
1663         syncprov_info_t         *si = on->on_bi.bi_private;
1664         syncmatches *sm;
1665
1666         if ( rs->sr_err == LDAP_SUCCESS )
1667         {
1668                 struct berval maxcsn;
1669                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1670                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1671
1672                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1673
1674                 /* Update our context CSN */
1675                 cbuf[0] = '\0';
1676                 maxcsn.bv_val = cbuf;
1677                 maxcsn.bv_len = sizeof(cbuf);
1678                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1679
1680                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1681                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1682                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1683                         /* Catch contextCSN updates from syncrepl. We have to look at
1684                          * all the attribute values, as there may be more than one csn
1685                          * that changed, and only one can be passed in the csn queue.
1686                          */
1687                         Modifications *mod = op->orm_modlist;
1688                         int i, j, sid;
1689
1690                         for ( i=0; i<mod->sml_numvals; i++ ) {
1691                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1692
1693                                 for ( j=0; j<si->si_numcsns; j++ ) {
1694                                         if ( sid == si->si_sids[j] ) {
1695                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1696                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1697                                                         csn_changed = 1;
1698                                                 }
1699                                                 break;
1700                                         }
1701                                 }
1702
1703                                 if ( j == si->si_numcsns ) {
1704                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1705                                         si->si_numcsns++;
1706                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1707                                                 sizeof(int));
1708                                         si->si_sids[j] = sid;
1709                                         csn_changed = 1;
1710                                 }
1711                         }
1712                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1713
1714                         if ( csn_changed ) {
1715                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1716                                 have_psearches = ( si->si_ops != NULL );
1717                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1718
1719                                 if ( have_psearches ) {
1720                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1721                                                 if ( sm->sm_op->s_op->o_abandon )
1722                                                         continue;
1723                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1724                                         }
1725                                 }
1726                         }
1727                         goto leave;
1728                 }
1729
1730                 slap_get_commit_csn( op, &maxcsn, &foundit );
1731                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1732                         /* syncrepl queues the CSN values in the db where
1733                          * it is configured , not where the changes are made.
1734                          * So look for a value in the glue db if we didn't
1735                          * find any in this db.
1736                          */
1737                         BackendDB *be = op->o_bd;
1738                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1739                         maxcsn.bv_val = cbuf;
1740                         maxcsn.bv_len = sizeof(cbuf);
1741                         slap_get_commit_csn( op, &maxcsn, &foundit );
1742                         op->o_bd = be;
1743                 }
1744                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1745                         int i, sid;
1746 #ifdef CHECK_CSN
1747                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1748                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1749 #endif
1750                         sid = slap_parse_csn_sid( &maxcsn );
1751                         for ( i=0; i<si->si_numcsns; i++ ) {
1752                                 if ( sid == si->si_sids[i] ) {
1753                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1754                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1755                                                 csn_changed = 1;
1756                                         }
1757                                         break;
1758                                 }
1759                         }
1760                         /* It's a new SID for us */
1761                         if ( i == si->si_numcsns ) {
1762                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1763                                 csn_changed = 1;
1764                                 si->si_numcsns++;
1765                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1766                                         sizeof(int));
1767                                 si->si_sids[i] = sid;
1768                         }
1769 #if 0
1770                 } else if ( !foundit ) {
1771                         /* internal ops that aren't meant to be replicated */
1772                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1773                         return SLAP_CB_CONTINUE;
1774 #endif
1775                 }
1776
1777                 /* Don't do any processing for consumer contextCSN updates */
1778                 if ( op->o_dont_replicate ) {
1779                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1780                         goto leave;
1781                 }
1782
1783                 si->si_numops++;
1784                 if ( si->si_chkops || si->si_chktime ) {
1785                         /* Never checkpoint adding the context entry,
1786                          * it will deadlock
1787                          */
1788                         if ( op->o_tag != LDAP_REQ_ADD ||
1789                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1790                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1791                                         do_check = 1;
1792                                         si->si_numops = 0;
1793                                 }
1794                                 if ( si->si_chktime &&
1795                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1796                                         if ( si->si_chklast ) {
1797                                                 do_check = 1;
1798                                                 si->si_chklast = op->o_time;
1799                                         } else {
1800                                                 si->si_chklast = 1;
1801                                         }
1802                                 }
1803                         }
1804                 }
1805                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1806
1807                 if ( do_check ) {
1808                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1809                         syncprov_checkpoint( op, rs, on );
1810                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1811                 }
1812
1813                 /* only update consumer ctx if this is a newer csn */
1814                 if ( csn_changed ) {
1815                         opc->sctxcsn = maxcsn;
1816                 }
1817
1818                 /* Handle any persistent searches */
1819                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1820                 have_psearches = ( si->si_ops != NULL );
1821                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1822                 if ( have_psearches ) {
1823                         switch(op->o_tag) {
1824                         case LDAP_REQ_ADD:
1825                         case LDAP_REQ_MODIFY:
1826                         case LDAP_REQ_MODRDN:
1827                         case LDAP_REQ_EXTENDED:
1828                                 syncprov_matchops( op, opc, 0 );
1829                                 break;
1830                         case LDAP_REQ_DELETE:
1831                                 /* for each match in opc->smatches:
1832                                  *   send DELETE msg
1833                                  */
1834                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1835                                         if ( sm->sm_op->s_op->o_abandon )
1836                                                 continue;
1837                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1838                                 }
1839                                 break;
1840                         }
1841                 }
1842
1843                 /* Add any log records */
1844                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1845                         syncprov_add_slog( op );
1846                 }
1847 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1848         }
1849         return SLAP_CB_CONTINUE;
1850 }
1851
1852 /* We don't use a subentry to store the context CSN any more.
1853  * We expose the current context CSN as an operational attribute
1854  * of the suffix entry.
1855  */
1856 static int
1857 syncprov_op_compare( Operation *op, SlapReply *rs )
1858 {
1859         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1860         syncprov_info_t         *si = on->on_bi.bi_private;
1861         int rc = SLAP_CB_CONTINUE;
1862
1863         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1864                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1865         {
1866                 Entry e = {0};
1867                 Attribute a = {0};
1868
1869                 e.e_name = si->si_contextdn;
1870                 e.e_nname = si->si_contextdn;
1871                 e.e_attrs = &a;
1872
1873                 a.a_desc = slap_schema.si_ad_contextCSN;
1874
1875                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1876
1877                 a.a_vals = si->si_ctxcsn;
1878                 a.a_nvals = a.a_vals;
1879                 a.a_numvals = si->si_numcsns;
1880
1881                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1882                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1883                 if ( ! rs->sr_err ) {
1884                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1885                         goto return_results;
1886                 }
1887
1888                 if ( get_assert( op ) &&
1889                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1890                 {
1891                         rs->sr_err = LDAP_ASSERTION_FAILED;
1892                         goto return_results;
1893                 }
1894
1895
1896                 rs->sr_err = LDAP_COMPARE_FALSE;
1897
1898                 if ( attr_valfind( &a,
1899                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1900                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1901                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1902                 {
1903                         rs->sr_err = LDAP_COMPARE_TRUE;
1904                 }
1905
1906 return_results:;
1907
1908                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1909
1910                 send_ldap_result( op, rs );
1911
1912                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1913                         rs->sr_err = LDAP_SUCCESS;
1914                 }
1915                 rc = rs->sr_err;
1916         }
1917
1918         return rc;
1919 }
1920
1921 static int
1922 syncprov_op_mod( Operation *op, SlapReply *rs )
1923 {
1924         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1925         syncprov_info_t         *si = on->on_bi.bi_private;
1926         slap_callback *cb;
1927         opcookie *opc;
1928         int have_psearches, cbsize;
1929
1930         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1931         have_psearches = ( si->si_ops != NULL );
1932         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1933
1934         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1935                 (have_psearches ? sizeof(modinst) : 0 );
1936
1937         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1938         opc = (opcookie *)(cb+1);
1939         opc->son = on;
1940         cb->sc_response = syncprov_op_response;
1941         cb->sc_cleanup = syncprov_op_cleanup;
1942         cb->sc_private = opc;
1943         cb->sc_next = op->o_callback;
1944         op->o_callback = cb;
1945
1946         opc->osid = -1;
1947         opc->rsid = -1;
1948         if ( op->o_csn.bv_val ) {
1949                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1950         }
1951         if ( op->o_controls ) {
1952                 struct sync_cookie *scook =
1953                 op->o_controls[slap_cids.sc_LDAPsync];
1954                 if ( scook )
1955                         opc->rsid = scook->sid;
1956         }
1957
1958         /* If there are active persistent searches, lock this operation.
1959          * See seqmod.c for the locking logic on its own.
1960          */
1961         if ( have_psearches ) {
1962                 modtarget *mt, mtdummy;
1963                 modinst *mi;
1964
1965                 mi = (modinst *)(opc+1);
1966                 mi->mi_op = op;
1967
1968                 /* See if we're already modifying this entry... */
1969                 mtdummy.mt_op = op;
1970                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1971                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1972                 if ( mt ) {
1973                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1974                         if ( mt->mt_mods == NULL ) {
1975                                 /* Cannot reuse this mt, as another thread is about
1976                                  * to release it in syncprov_op_cleanup.
1977                                  */
1978                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1979                                 mt = NULL;
1980                         }
1981                 }
1982                 if ( mt ) {
1983                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1984                         mt->mt_tail->mi_next = mi;
1985                         mt->mt_tail = mi;
1986                         /* wait for this op to get to head of list */
1987                         while ( mt->mt_mods != mi ) {
1988                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1989                                 /* FIXME: if dynamic config can delete overlays or
1990                                  * databases we'll have to check for cleanup here.
1991                                  * Currently it's not an issue because there are
1992                                  * no dynamic config deletes...
1993                                  */
1994                                 if ( slapd_shutdown )
1995                                         return SLAPD_ABANDON;
1996
1997                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1998                                         ldap_pvt_thread_yield();
1999                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2000
2001                                 /* clean up if the caller is giving up */
2002                                 if ( op->o_abandon ) {
2003                                         modinst *m2;
2004                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2005                                                 m2 = m2->mi_next );
2006                                         m2->mi_next = mi->mi_next;
2007                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2008                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2009                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2010                                         return SLAPD_ABANDON;
2011                                 }
2012                         }
2013                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2014                 } else {
2015                         /* Record that we're modifying this entry now */
2016                         mt = ch_malloc( sizeof(modtarget) );
2017                         mt->mt_mods = mi;
2018                         mt->mt_tail = mi;
2019                         mt->mt_op = mi->mi_op;
2020                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2021                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2022                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2023                 }
2024                 opc->smt = mt;
2025         }
2026
2027         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2028                 syncprov_matchops( op, opc, 1 );
2029
2030         return SLAP_CB_CONTINUE;
2031 }
2032
2033 static int
2034 syncprov_op_extended( Operation *op, SlapReply *rs )
2035 {
2036         if ( exop_is_write( op ))
2037                 return syncprov_op_mod( op, rs );
2038
2039         return SLAP_CB_CONTINUE;
2040 }
2041
2042 typedef struct searchstate {
2043         slap_overinst *ss_on;
2044         syncops *ss_so;
2045         BerVarray ss_ctxcsn;
2046         int *ss_sids;
2047         int ss_numcsns;
2048 #define SS_PRESENT      0x01
2049 #define SS_CHANGED      0x02
2050         int ss_flags;
2051 } searchstate;
2052
2053 static int
2054 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2055 {
2056         if ( rs->sr_ctrls ) {
2057                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2058                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2059                 rs->sr_ctrls = NULL;
2060         }
2061         return 0;
2062 }
2063
2064 typedef struct SyncOperationBuffer {
2065         Operation               sob_op;
2066         Opheader                sob_hdr;
2067         OpExtra                 sob_oe;
2068         AttributeName   sob_extra;      /* not always present */
2069         /* Further data allocated here */
2070 } SyncOperationBuffer;
2071
2072 static void
2073 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2074 {
2075         SyncOperationBuffer *sopbuf2;
2076         Operation *op2;
2077         int i, alen = 0;
2078         size_t size;
2079         char *ptr;
2080         GroupAssertion *g1, *g2;
2081
2082         /* count the search attrs */
2083         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2084                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2085         }
2086         /* Make a new copy of the operation */
2087         size = offsetof( SyncOperationBuffer, sob_extra ) +
2088                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2089                 op->o_req_dn.bv_len + 1 +
2090                 op->o_req_ndn.bv_len + 1 +
2091                 op->o_ndn.bv_len + 1 +
2092                 so->s_filterstr.bv_len + 1;
2093         sopbuf2 = ch_calloc( 1, size );
2094         op2 = &sopbuf2->sob_op;
2095         op2->o_hdr = &sopbuf2->sob_hdr;
2096         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2097
2098         /* Copy the fields we care about explicitly, leave the rest alone */
2099         *op2->o_hdr = *op->o_hdr;
2100         op2->o_tag = op->o_tag;
2101         op2->o_time = op->o_time;
2102         op2->o_bd = on->on_info->oi_origdb;
2103         op2->o_request = op->o_request;
2104         op2->o_managedsait = op->o_managedsait;
2105         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2106         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2107
2108         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2109         if ( i ) {
2110                 op2->ors_attrs = (AttributeName *) ptr;
2111                 ptr = (char *) &op2->ors_attrs[i+1];
2112                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2113                         op2->ors_attrs[i] = op->ors_attrs[i];
2114                         op2->ors_attrs[i].an_name.bv_val = ptr;
2115                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2116                 }
2117                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2118         }
2119
2120         op2->o_authz = op->o_authz;
2121         op2->o_ndn.bv_val = ptr;
2122         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2123         op2->o_dn = op2->o_ndn;
2124         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2125         op2->o_req_dn.bv_val = ptr;
2126         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2127         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2128         op2->o_req_ndn.bv_val = ptr;
2129         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2130         op2->ors_filterstr.bv_val = ptr;
2131         strcpy( ptr, so->s_filterstr.bv_val );
2132         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2133
2134         /* Skip the AND/GE clause that we stuck on in front */
2135         if ( so->s_flags & PS_FIX_FILTER ) {
2136                 op2->ors_filter = op->ors_filter->f_and->f_next;
2137                 so->s_flags ^= PS_FIX_FILTER;
2138         } else {
2139                 op2->ors_filter = op->ors_filter;
2140         }
2141         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2142         so->s_op = op2;
2143
2144         /* Copy any cached group ACLs individually */
2145         op2->o_groups = NULL;
2146         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2147                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2148                 *g2 = *g1;
2149                 strcpy( g2->ga_ndn, g1->ga_ndn );
2150                 g2->ga_next = op2->o_groups;
2151                 op2->o_groups = g2;
2152         }
2153         /* Don't allow any further group caching */
2154         op2->o_do_not_cache = 1;
2155
2156         /* Add op2 to conn so abandon will find us */
2157         op->o_conn->c_n_ops_executing++;
2158         op->o_conn->c_n_ops_completed--;
2159         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2160         so->s_flags |= PS_IS_DETACHED;
2161
2162         /* Prevent anyone else from trying to send a result for this op */
2163         op->o_abandon = 1;
2164 }
2165
2166 static int
2167 syncprov_search_response( Operation *op, SlapReply *rs )
2168 {
2169         searchstate *ss = op->o_callback->sc_private;
2170         slap_overinst *on = ss->ss_on;
2171         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2172         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2173
2174         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2175                 Attribute *a;
2176                 /* If we got a referral without a referral object, there's
2177                  * something missing that we cannot replicate. Just ignore it.
2178                  * The consumer will abort because we didn't send the expected
2179                  * control.
2180                  */
2181                 if ( !rs->sr_entry ) {
2182                         assert( rs->sr_entry != NULL );
2183                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2184                         return SLAP_CB_CONTINUE;
2185                 }
2186                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2187                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2188                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2189                 }
2190                 if ( a ) {
2191                         int i, sid;
2192                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2193
2194                         /* Don't send changed entries back to the originator */
2195                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2196                                 Debug( LDAP_DEBUG_SYNC,
2197                                         "Entry %s changed by peer, ignored\n",
2198                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2199                                 return LDAP_SUCCESS;
2200                         }
2201
2202                         /* If not a persistent search */
2203                         if ( !ss->ss_so ) {
2204                                 /* Make sure entry is less than the snapshot'd contextCSN */
2205                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2206                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2207                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2208                                                 Debug( LDAP_DEBUG_SYNC,
2209                                                         "Entry %s CSN %s greater than snapshot %s\n",
2210                                                         rs->sr_entry->e_name.bv_val,
2211                                                         a->a_nvals[0].bv_val,
2212                                                         ss->ss_ctxcsn[i].bv_val );
2213                                                 return LDAP_SUCCESS;
2214                                         }
2215                                 }
2216                         }
2217
2218                         /* Don't send old entries twice */
2219                         if ( srs->sr_state.ctxcsn ) {
2220                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2221                                         if ( sid == srs->sr_state.sids[i] &&
2222                                                 ber_bvcmp( &a->a_nvals[0],
2223                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2224                                                 Debug( LDAP_DEBUG_SYNC,
2225                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2226                                                         rs->sr_entry->e_name.bv_val,
2227                                                         a->a_nvals[0].bv_val,
2228                                                         srs->sr_state.ctxcsn[i].bv_val );
2229                                                 return LDAP_SUCCESS;
2230                                         }
2231                                 }
2232                         }
2233                 }
2234                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2235                         op->o_tmpmemctx );
2236                 rs->sr_ctrls[1] = NULL;
2237                 /* If we're in delta-sync mode, always send a cookie */
2238                 if ( si->si_nopres && si->si_usehint && a ) {
2239                         struct berval cookie;
2240                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2241                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2242                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2243                 } else {
2244                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2245                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2246                 }
2247         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2248                 struct berval cookie = BER_BVNULL;
2249
2250                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2251                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2252                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2253                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2254
2255                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2256                 }
2257
2258                 /* Is this a regular refresh?
2259                  * Note: refresh never gets here if there were no changes
2260                  */
2261                 if ( !ss->ss_so ) {
2262                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2263                                 op->o_tmpmemctx );
2264                         rs->sr_ctrls[1] = NULL;
2265                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2266                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2267                                         LDAP_SYNC_REFRESH_DELETES );
2268                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2269                 } else {
2270                 /* It's RefreshAndPersist, transition to Persist phase */
2271                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2272                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2273                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2274                                 1, NULL, 0 );
2275                         if ( !BER_BVISNULL( &cookie ))
2276                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2277
2278                         /* Detach this Op from frontend control */
2279                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2280
2281                         /* But not if this connection was closed along the way */
2282                         if ( op->o_abandon ) {
2283                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2284                                 /* syncprov_ab_cleanup will free this syncop */
2285                                 return SLAPD_ABANDON;
2286
2287                         } else {
2288                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2289                                 /* Turn off the refreshing flag */
2290                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2291
2292                                 syncprov_detach_op( op, ss->ss_so, on );
2293
2294                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2295
2296                                 /* If there are queued responses, fire them off */
2297                                 if ( ss->ss_so->s_res )
2298                                         syncprov_qstart( ss->ss_so );
2299                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2300                         }
2301
2302                         return LDAP_SUCCESS;
2303                 }
2304         }
2305
2306         return SLAP_CB_CONTINUE;
2307 }
2308
2309 static int
2310 syncprov_op_search( Operation *op, SlapReply *rs )
2311 {
2312         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2313         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2314         slap_callback   *cb;
2315         int gotstate = 0, changed = 0, do_present = 0;
2316         syncops *sop = NULL;
2317         searchstate *ss;
2318         sync_control *srs;
2319         BerVarray ctxcsn;
2320         int i, *sids, numcsns;
2321         struct berval mincsn;
2322
2323         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2324
2325         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2326                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2327                 return rs->sr_err;
2328         }
2329
2330         srs = op->o_controls[slap_cids.sc_LDAPsync];
2331
2332         /* If this is a persistent search, set it up right away */
2333         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2334                 syncops so = {0};
2335                 fbase_cookie fc;
2336                 opcookie opc;
2337                 slap_callback sc;
2338
2339                 fc.fss = &so;
2340                 fc.fbase = 0;
2341                 so.s_eid = NOID;
2342                 so.s_op = op;
2343                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2344                 /* syncprov_findbase expects to be called as a callback... */
2345                 sc.sc_private = &opc;
2346                 opc.son = on;
2347                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2348                 cb = op->o_callback;
2349                 op->o_callback = &sc;
2350                 rs->sr_err = syncprov_findbase( op, &fc );
2351                 op->o_callback = cb;
2352                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2353
2354                 if ( rs->sr_err != LDAP_SUCCESS ) {
2355                         send_ldap_result( op, rs );
2356                         return rs->sr_err;
2357                 }
2358                 sop = ch_malloc( sizeof( syncops ));
2359                 *sop = so;
2360                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2361                 sop->s_rid = srs->sr_state.rid;
2362                 sop->s_sid = srs->sr_state.sid;
2363                 sop->s_inuse = 1;
2364
2365                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2366                 sop->s_next = si->si_ops;
2367                 si->si_ops = sop;
2368                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2369         }
2370
2371         /* snapshot the ctxcsn */
2372         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2373         numcsns = si->si_numcsns;
2374         if ( numcsns ) {
2375                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2376                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2377                 for ( i=0; i<numcsns; i++ )
2378                         sids[i] = si->si_sids[i];
2379         } else {
2380                 ctxcsn = NULL;
2381                 sids = NULL;
2382         }
2383         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2384
2385         /* If we have a cookie, handle the PRESENT lookups */
2386         if ( srs->sr_state.ctxcsn ) {
2387                 sessionlog *sl;
2388                 int i, j;
2389
2390                 /* If we don't have any CSN of our own yet, pretend nothing
2391                  * has changed.
2392                  */
2393                 if ( !numcsns )
2394                         goto no_change;
2395
2396                 if ( !si->si_nopres )
2397                         do_present = SS_PRESENT;
2398
2399                 /* If there are SIDs we don't recognize in the cookie, drop them */
2400                 for (i=0; i<srs->sr_state.numcsns; ) {
2401                         for (j=0; j<numcsns; j++) {
2402                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2403                                         break;
2404                                 }
2405                         }
2406                         /* not found */
2407                         if ( j == numcsns ) {
2408                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2409                                 j = srs->sr_state.numcsns - 1;
2410                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2411                                 tmp.bv_len = 0;
2412                                 srs->sr_state.ctxcsn[j] = tmp;
2413                                 srs->sr_state.numcsns = j;
2414                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2415                                 continue;
2416                         }
2417                         i++;
2418                 }
2419
2420                 /* Find the smallest CSN */
2421                 mincsn = srs->sr_state.ctxcsn[0];
2422                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2423                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2424                                 mincsn = srs->sr_state.ctxcsn[i];
2425                 }
2426
2427                 /* If nothing has changed, shortcut it */
2428                 if ( srs->sr_state.numcsns == numcsns ) {
2429                         int i, j, newer;
2430                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2431                                 for ( j=0; j<numcsns; j++ ) {
2432                                         if ( srs->sr_state.sids[i] != sids[j] )
2433                                                 continue;
2434                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2435                                         /* If our state is newer, tell consumer about changes */
2436                                         if ( newer < 0 )
2437                                                 changed = SS_CHANGED;
2438                                         else if ( newer > 0 ) {
2439                                         /* our state is older, tell consumer nothing */
2440                                                 if ( sop ) {
2441                                                         syncops **sp = &si->si_ops;
2442
2443                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2444                                                         while ( *sp != sop )
2445                                                                 sp = &(*sp)->s_next;
2446                                                         *sp = sop->s_next;
2447                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2448                                                         ch_free( sop );
2449                                                 }
2450                                                 rs->sr_err = LDAP_SUCCESS;
2451                                                 rs->sr_ctrls = NULL;
2452                                                 send_ldap_result( op, rs );
2453                                                 return rs->sr_err;
2454                                         }
2455                                         break;
2456                                 }
2457                                 if ( changed )
2458                                         break;
2459                         }
2460                         if ( !changed ) {
2461                                 do_present = 0;
2462 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2463                                         LDAPControl     *ctrls[2];
2464
2465                                         ctrls[0] = NULL;
2466                                         ctrls[1] = NULL;
2467                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2468                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2469                                         rs->sr_ctrls = ctrls;
2470                                         rs->sr_err = LDAP_SUCCESS;
2471                                         send_ldap_result( op, rs );
2472                                         rs->sr_ctrls = NULL;
2473                                         return rs->sr_err;
2474                                 }
2475                                 goto shortcut;
2476                         }
2477                 } else {
2478                         /* consumer doesn't have the right number of CSNs */
2479                         changed = SS_CHANGED;
2480                 }
2481                 /* Do we have a sessionlog for this search? */
2482                 sl=si->si_logs;
2483                 if ( sl ) {
2484                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2485                         /* Are there any log entries, and is the consumer state
2486                          * present in the session log?
2487                          */
2488                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2489                                 do_present = 0;
2490                                 /* mutex is unlocked in playlog */
2491                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2492                         } else {
2493                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2494                         }
2495                 }
2496                 /* Is the CSN still present in the database? */
2497                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2498                         /* No, so a reload is required */
2499                         /* the 2.2 consumer doesn't send this hint */
2500                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2501                                 if ( ctxcsn )
2502                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2503                                 if ( sids )
2504                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2505                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2506                                 return rs->sr_err;
2507                         }
2508                         if ( srs->sr_state.ctxcsn ) {
2509                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2510                                 srs->sr_state.ctxcsn = NULL;
2511                         }
2512                         if ( srs->sr_state.sids ) {
2513                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2514                                 srs->sr_state.sids = NULL;
2515                         }
2516                         srs->sr_state.numcsns = 0;
2517                 } else {
2518                         gotstate = 1;
2519                         /* If changed and doing Present lookup, send Present UUIDs */
2520                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2521                                 LDAP_SUCCESS ) {
2522                                 if ( ctxcsn )
2523                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2524                                 if ( sids )
2525                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2526                                 send_ldap_result( op, rs );
2527                                 return rs->sr_err;
2528                         }
2529                 }
2530         } else {
2531                 /* No consumer state, assume something has changed */
2532                 changed = SS_CHANGED;
2533         }
2534
2535 shortcut:
2536         /* Append CSN range to search filter, save original filter
2537          * for persistent search evaluation
2538          */
2539         if ( sop ) {
2540                 sop->s_filterstr= op->ors_filterstr;
2541         }
2542
2543         /* If something changed, find the changes */
2544         if ( gotstate && changed ) {
2545                 Filter *fand, *fava;
2546
2547                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2548                 fand->f_choice = LDAP_FILTER_AND;
2549                 fand->f_next = NULL;
2550                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2551                 fand->f_and = fava;
2552                 fava->f_choice = LDAP_FILTER_GE;
2553                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2554                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2555 #ifdef LDAP_COMP_MATCH
2556                 fava->f_ava->aa_cf = NULL;
2557 #endif
2558                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2559                 fava->f_next = op->ors_filter;
2560                 op->ors_filter = fand;
2561                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2562                 if ( sop )
2563                         sop->s_flags |= PS_FIX_FILTER;
2564         }
2565
2566         /* Let our callback add needed info to returned entries */
2567         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2568         ss = (searchstate *)(cb+1);
2569         ss->ss_on = on;
2570         ss->ss_so = sop;
2571         ss->ss_flags = do_present | changed;
2572         ss->ss_ctxcsn = ctxcsn;
2573         ss->ss_numcsns = numcsns;
2574         ss->ss_sids = sids;
2575         cb->sc_response = syncprov_search_response;
2576         cb->sc_cleanup = syncprov_search_cleanup;
2577         cb->sc_private = ss;
2578         cb->sc_next = op->o_callback;
2579         op->o_callback = cb;
2580
2581         /* If this is a persistent search and no changes were reported during
2582          * the refresh phase, just invoke the response callback to transition
2583          * us into persist phase
2584          */
2585         if ( !changed ) {
2586                 rs->sr_err = LDAP_SUCCESS;
2587                 rs->sr_nentries = 0;
2588                 send_ldap_result( op, rs );
2589                 return rs->sr_err;
2590         }
2591         return SLAP_CB_CONTINUE;
2592 }
2593
2594 static int
2595 syncprov_operational(
2596         Operation *op,
2597         SlapReply *rs )
2598 {
2599         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2600         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2601
2602         /* This prevents generating unnecessarily; frontend will strip
2603          * any statically stored copy.
2604          */
2605         if ( op->o_sync != SLAP_CONTROL_NONE )
2606                 return SLAP_CB_CONTINUE;
2607
2608         if ( rs->sr_entry &&
2609                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2610
2611                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2612                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2613                         Attribute *a, **ap = NULL;
2614
2615                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2616                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2617                                         break;
2618                         }
2619
2620                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2621                         if ( si->si_ctxcsn ) {
2622                                 if ( !a ) {
2623                                         for ( ap = &rs->sr_operational_attrs; *ap;
2624                                                 ap=&(*ap)->a_next );
2625
2626                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2627                                         *ap = a;
2628                                 }
2629
2630                                 if ( !ap ) {
2631                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2632                                                 Entry *e = entry_dup( rs->sr_entry );
2633                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2634                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2635                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2636                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2637                                                         entry_free( rs->sr_entry );
2638                                                 }
2639                                                 rs->sr_entry = e;
2640                                                 rs->sr_flags |=
2641                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2642                                                 a = attr_find( rs->sr_entry->e_attrs,
2643                                                         slap_schema.si_ad_contextCSN );
2644                                         }
2645                                         if ( a->a_nvals != a->a_vals ) {
2646                                                 ber_bvarray_free( a->a_nvals );
2647                                         }
2648                                         a->a_nvals = NULL;
2649                                         ber_bvarray_free( a->a_vals );
2650                                         a->a_vals = NULL;
2651                                         a->a_numvals = 0;
2652                                 }
2653                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2654                         }
2655                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2656                 }
2657         }
2658         return SLAP_CB_CONTINUE;
2659 }
2660
2661 enum {
2662         SP_CHKPT = 1,
2663         SP_SESSL,
2664         SP_NOPRES,
2665         SP_USEHINT
2666 };
2667
2668 static ConfigDriver sp_cf_gen;
2669
2670 static ConfigTable spcfg[] = {
2671         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2672                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2673                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2674                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2675         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2676                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2677                         "DESC 'Session log size in ops' "
2678                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2679         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2680                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2681                         "DESC 'Omit Present phase processing' "
2682                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2683         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2684                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2685                         "DESC 'Observe Reload Hint in Request control' "
2686                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2687         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2688 };
2689
2690 static ConfigOCs spocs[] = {
2691         { "( OLcfgOvOc:1.1 "
2692                 "NAME 'olcSyncProvConfig' "
2693                 "DESC 'SyncRepl Provider configuration' "
2694                 "SUP olcOverlayConfig "
2695                 "MAY ( olcSpCheckpoint "
2696                         "$ olcSpSessionlog "
2697                         "$ olcSpNoPresent "
2698                         "$ olcSpReloadHint "
2699                 ") )",
2700                         Cft_Overlay, spcfg },
2701         { NULL, 0, NULL }
2702 };
2703
2704 static int
2705 sp_cf_gen(ConfigArgs *c)
2706 {
2707         slap_overinst           *on = (slap_overinst *)c->bi;
2708         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2709         int rc = 0;
2710
2711         if ( c->op == SLAP_CONFIG_EMIT ) {
2712                 switch ( c->type ) {
2713                 case SP_CHKPT:
2714                         if ( si->si_chkops || si->si_chktime ) {
2715                                 struct berval bv;
2716                                 /* we assume si_chktime is a multiple of 60
2717                                  * because the parsed value was originally
2718                                  * multiplied by 60 */
2719                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2720                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2721                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2722                                         rc = 1;
2723                                 } else {
2724                                         bv.bv_val = c->cr_msg;
2725                                         value_add_one( &c->rvalue_vals, &bv );
2726                                 }
2727                         } else {
2728                                 rc = 1;
2729                         }
2730                         break;
2731                 case SP_SESSL:
2732                         if ( si->si_logs ) {
2733                                 c->value_int = si->si_logs->sl_size;
2734                         } else {
2735                                 rc = 1;
2736                         }
2737                         break;
2738                 case SP_NOPRES:
2739                         if ( si->si_nopres ) {
2740                                 c->value_int = 1;
2741                         } else {
2742                                 rc = 1;
2743                         }
2744                         break;
2745                 case SP_USEHINT:
2746                         if ( si->si_usehint ) {
2747                                 c->value_int = 1;
2748                         } else {
2749                                 rc = 1;
2750                         }
2751                         break;
2752                 }
2753                 return rc;
2754         } else if ( c->op == LDAP_MOD_DELETE ) {
2755                 switch ( c->type ) {
2756                 case SP_CHKPT:
2757                         si->si_chkops = 0;
2758                         si->si_chktime = 0;
2759                         break;
2760                 case SP_SESSL:
2761                         if ( si->si_logs )
2762                                 si->si_logs->sl_size = 0;
2763                         else
2764                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2765                         break;
2766                 case SP_NOPRES:
2767                         if ( si->si_nopres )
2768                                 si->si_nopres = 0;
2769                         else
2770                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2771                         break;
2772                 case SP_USEHINT:
2773                         if ( si->si_usehint )
2774                                 si->si_usehint = 0;
2775                         else
2776                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2777                         break;
2778                 }
2779                 return rc;
2780         }
2781         switch ( c->type ) {
2782         case SP_CHKPT:
2783                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2784                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2785                                 c->argv[0], c->argv[1] );
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 ( si->si_chkops <= 0 ) {
2791                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2792                                 c->argv[0], si->si_chkops );
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 ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2798                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2799                                 c->argv[0], c->argv[1] );
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                 if ( si->si_chktime <= 0 ) {
2805                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2806                                 c->argv[0], si->si_chkops );
2807                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2808                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2809                         return ARG_BAD_CONF;
2810                 }
2811                 si->si_chktime *= 60;
2812                 break;
2813         case SP_SESSL: {
2814                 sessionlog *sl;
2815                 int size = c->value_int;
2816
2817                 if ( size < 0 ) {
2818                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2819                                 c->argv[0], size );
2820                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2821                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2822                         return ARG_BAD_CONF;
2823                 }
2824                 sl = si->si_logs;
2825                 if ( !sl ) {
2826                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2827                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2828                         sl->sl_mincsn.bv_len = 0;
2829                         sl->sl_num = 0;
2830                         sl->sl_head = sl->sl_tail = NULL;
2831                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2832                         si->si_logs = sl;
2833                 }
2834                 sl->sl_size = size;
2835                 }
2836                 break;
2837         case SP_NOPRES:
2838                 si->si_nopres = c->value_int;
2839                 break;
2840         case SP_USEHINT:
2841                 si->si_usehint = c->value_int;
2842                 break;
2843         }
2844         return rc;
2845 }
2846
2847 /* ITS#3456 we cannot run this search on the main thread, must use a
2848  * child thread in order to insure we have a big enough stack.
2849  */
2850 static void *
2851 syncprov_db_otask(
2852         void *ptr
2853 )
2854 {
2855         syncprov_findcsn( ptr, FIND_MAXCSN );
2856         return NULL;
2857 }
2858
2859 /* Read any existing contextCSN from the underlying db.
2860  * Then search for any entries newer than that. If no value exists,
2861  * just generate it. Cache whatever result.
2862  */
2863 static int
2864 syncprov_db_open(
2865         BackendDB *be,
2866         ConfigReply *cr
2867 )
2868 {
2869         slap_overinst   *on = (slap_overinst *) be->bd_info;
2870         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2871
2872         Connection conn = { 0 };
2873         OperationBuffer opbuf;
2874         Operation *op;
2875         Entry *e = NULL;
2876         Attribute *a;
2877         int rc;
2878         void *thrctx = NULL;
2879
2880         if ( !SLAP_LASTMOD( be )) {
2881                 Debug( LDAP_DEBUG_ANY,
2882                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2883                 return -1;
2884         }
2885
2886         if ( slapMode & SLAP_TOOL_MODE ) {
2887                 return 0;
2888         }
2889
2890         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2891         if ( rc ) {
2892                 return rc;
2893         }
2894
2895         thrctx = ldap_pvt_thread_pool_context();
2896         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2897         op = &opbuf.ob_op;
2898         op->o_bd = be;
2899         op->o_dn = be->be_rootdn;
2900         op->o_ndn = be->be_rootndn;
2901
2902         if ( SLAP_SYNC_SUBENTRY( be )) {
2903                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2904                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2905         } else {
2906                 si->si_contextdn = be->be_nsuffix[0];
2907         }
2908         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2909                 slap_schema.si_ad_contextCSN, 0, &e, on );
2910
2911         if ( e ) {
2912                 ldap_pvt_thread_t tid;
2913
2914                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2915                 if ( a ) {
2916                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2917                         si->si_numcsns = a->a_numvals;
2918                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2919                 }
2920                 overlay_entry_release_ov( op, e, 0, on );
2921                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2922                         op->o_req_dn = be->be_suffix[0];
2923                         op->o_req_ndn = be->be_nsuffix[0];
2924                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2925                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2926                         ldap_pvt_thread_join( tid, NULL );
2927                 }
2928         }
2929
2930         /* Didn't find a contextCSN, should we generate one? */
2931         if ( !si->si_ctxcsn ) {
2932                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2933                 struct berval csn;
2934
2935                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2936                 /* If we're also a consumer, then don't generate anything.
2937                  * Wait for our provider to send it to us, or for a local
2938                  * modify if we have multimaster.
2939                  */
2940                         goto out;
2941                 }
2942                 csn.bv_val = csnbuf;
2943                 csn.bv_len = sizeof( csnbuf );
2944                 slap_get_csn( op, &csn, 0 );
2945                 value_add_one( &si->si_ctxcsn, &csn );
2946                 si->si_numcsns = 1;
2947                 si->si_sids = ch_malloc( sizeof(int) );
2948                 si->si_sids[0] = slap_serverID;
2949
2950                 /* make sure we do a checkpoint on close */
2951                 si->si_numops++;
2952         }
2953
2954 out:
2955         op->o_bd->bd_info = (BackendInfo *)on;
2956         return 0;
2957 }
2958
2959 /* Write the current contextCSN into the underlying db.
2960  */
2961 static int
2962 syncprov_db_close(
2963         BackendDB *be,
2964         ConfigReply *cr
2965 )
2966 {
2967     slap_overinst   *on = (slap_overinst *) be->bd_info;
2968     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2969
2970         if ( slapMode & SLAP_TOOL_MODE ) {
2971                 return 0;
2972         }
2973         if ( si->si_numops ) {
2974                 Connection conn = {0};
2975                 OperationBuffer opbuf;
2976                 Operation *op;
2977                 SlapReply rs = {REP_RESULT};
2978                 void *thrctx;
2979
2980                 thrctx = ldap_pvt_thread_pool_context();
2981                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2982                 op = &opbuf.ob_op;
2983                 op->o_bd = be;
2984                 op->o_dn = be->be_rootdn;
2985                 op->o_ndn = be->be_rootndn;
2986                 syncprov_checkpoint( op, &rs, on );
2987         }
2988
2989     return 0;
2990 }
2991
2992 static int
2993 syncprov_db_init(
2994         BackendDB *be,
2995         ConfigReply *cr
2996 )
2997 {
2998         slap_overinst   *on = (slap_overinst *)be->bd_info;
2999         syncprov_info_t *si;
3000
3001         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3002                 Debug( LDAP_DEBUG_ANY,
3003                         "syncprov must be instantiated within a database.\n",
3004                         0, 0, 0 );
3005                 return 1;
3006         }
3007
3008         si = ch_calloc(1, sizeof(syncprov_info_t));
3009         on->on_bi.bi_private = si;
3010         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3011         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3012         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3013         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3014
3015         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3016         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3017         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3018         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3019
3020         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3021         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3022
3023         return 0;
3024 }
3025
3026 static int
3027 syncprov_db_destroy(
3028         BackendDB *be,
3029         ConfigReply *cr
3030 )
3031 {
3032         slap_overinst   *on = (slap_overinst *)be->bd_info;
3033         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3034
3035         if ( si ) {
3036                 if ( si->si_logs ) {
3037                         slog_entry *se = si->si_logs->sl_head;
3038
3039                         while ( se ) {
3040                                 slog_entry *se_next = se->se_next;
3041                                 ch_free( se );
3042                                 se = se_next;
3043                         }
3044
3045                         ch_free( si->si_logs );
3046                 }
3047                 if ( si->si_ctxcsn )
3048                         ber_bvarray_free( si->si_ctxcsn );
3049                 if ( si->si_sids )
3050                         ch_free( si->si_sids );
3051                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3052                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3053                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3054                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3055                 ch_free( si );
3056         }
3057
3058         return 0;
3059 }
3060
3061 static int syncprov_parseCtrl (
3062         Operation *op,
3063         SlapReply *rs,
3064         LDAPControl *ctrl )
3065 {
3066         ber_tag_t tag;
3067         BerElementBuffer berbuf;
3068         BerElement *ber = (BerElement *)&berbuf;
3069         ber_int_t mode;
3070         ber_len_t len;
3071         struct berval cookie = BER_BVNULL;
3072         sync_control *sr;
3073         int rhint = 0;
3074
3075         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3076                 rs->sr_text = "Sync control specified multiple times";
3077                 return LDAP_PROTOCOL_ERROR;
3078         }
3079
3080         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3081                 rs->sr_text = "Sync control specified with pagedResults control";
3082                 return LDAP_PROTOCOL_ERROR;
3083         }
3084
3085         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3086                 rs->sr_text = "Sync control value is absent";
3087                 return LDAP_PROTOCOL_ERROR;
3088         }
3089
3090         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3091                 rs->sr_text = "Sync control value is empty";
3092                 return LDAP_PROTOCOL_ERROR;
3093         }
3094
3095         /* Parse the control value
3096          *      syncRequestValue ::= SEQUENCE {
3097          *              mode   ENUMERATED {
3098          *                      -- 0 unused
3099          *                      refreshOnly             (1),
3100          *                      -- 2 reserved
3101          *                      refreshAndPersist       (3)
3102          *              },
3103          *              cookie  syncCookie OPTIONAL
3104          *      }
3105          */
3106
3107         ber_init2( ber, &ctrl->ldctl_value, 0 );
3108
3109         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3110                 rs->sr_text = "Sync control : mode decoding error";
3111                 return LDAP_PROTOCOL_ERROR;
3112         }
3113
3114         switch( mode ) {
3115         case LDAP_SYNC_REFRESH_ONLY:
3116                 mode = SLAP_SYNC_REFRESH;
3117                 break;
3118         case LDAP_SYNC_REFRESH_AND_PERSIST:
3119                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3120                 break;
3121         default:
3122                 rs->sr_text = "Sync control : unknown update mode";
3123                 return LDAP_PROTOCOL_ERROR;
3124         }
3125
3126         tag = ber_peek_tag( ber, &len );
3127
3128         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3129                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3130                         rs->sr_text = "Sync control : cookie decoding error";
3131                         return LDAP_PROTOCOL_ERROR;
3132                 }
3133                 tag = ber_peek_tag( ber, &len );
3134         }
3135         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3136                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3137                         rs->sr_text = "Sync control : rhint decoding error";
3138                         return LDAP_PROTOCOL_ERROR;
3139                 }
3140         }
3141         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3142                         rs->sr_text = "Sync control : decoding error";
3143                         return LDAP_PROTOCOL_ERROR;
3144         }
3145         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3146         sr->sr_rhint = rhint;
3147         if (!BER_BVISNULL(&cookie)) {
3148                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3149                 /* If parse fails, pretend no cookie was sent */
3150                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3151                         sr->sr_state.rid == -1 ) {
3152                         if ( sr->sr_state.ctxcsn ) {
3153                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3154                                 sr->sr_state.ctxcsn = NULL;
3155                         }
3156                         sr->sr_state.numcsns = 0;
3157                 }
3158         }
3159
3160         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3161
3162         op->o_sync = ctrl->ldctl_iscritical
3163                 ? SLAP_CONTROL_CRITICAL
3164                 : SLAP_CONTROL_NONCRITICAL;
3165
3166         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3167
3168         return LDAP_SUCCESS;
3169 }
3170
3171 /* This overlay is set up for dynamic loading via moduleload. For static
3172  * configuration, you'll need to arrange for the slap_overinst to be
3173  * initialized and registered by some other function inside slapd.
3174  */
3175
3176 static slap_overinst            syncprov;
3177
3178 int
3179 syncprov_initialize()
3180 {
3181         int rc;
3182
3183         rc = register_supported_control( LDAP_CONTROL_SYNC,
3184                 SLAP_CTRL_SEARCH, NULL,
3185                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3186         if ( rc != LDAP_SUCCESS ) {
3187                 Debug( LDAP_DEBUG_ANY,
3188                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3189                 return rc;
3190         }
3191
3192         syncprov.on_bi.bi_type = "syncprov";
3193         syncprov.on_bi.bi_db_init = syncprov_db_init;
3194         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3195         syncprov.on_bi.bi_db_open = syncprov_db_open;
3196         syncprov.on_bi.bi_db_close = syncprov_db_close;
3197
3198         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3199         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3200
3201         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3202         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3203         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3204         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3205         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3206         syncprov.on_bi.bi_op_search = syncprov_op_search;
3207         syncprov.on_bi.bi_extended = syncprov_op_extended;
3208         syncprov.on_bi.bi_operational = syncprov_operational;
3209
3210         syncprov.on_bi.bi_cf_ocs = spocs;
3211
3212         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3213
3214         rc = config_register_schema( spcfg, spocs );
3215         if ( rc ) return rc;
3216
3217         return overlay_register( &syncprov );
3218 }
3219
3220 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3221 int
3222 init_module( int argc, char *argv[] )
3223 {
3224         return syncprov_initialize();
3225 }
3226 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3227
3228 #endif /* defined(SLAPD_OVER_SYNCPROV) */