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
  75         int             s_inuse;        /* reference count */
  76         struct syncres *s_res;
  77         struct syncres *s_restail;
  78         struct re_s     *s_qtask;       /* task for playing psearch responses */
  79 #define RUNQ_INTERVAL   36000   /* a long time */
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         struct berval   sl_mincsn;
 117         int             sl_num;
 118         int             sl_size;
 119         slog_entry *sl_head;
 120         slog_entry *sl_tail;
 121         ldap_pvt_thread_mutex_t sl_mutex;
 122 } sessionlog;
 123
 124 /* The main state for this overlay */
 125 typedef struct syncprov_info_t {
 126         syncops         *si_ops;
 127         BerVarray       si_ctxcsn;      /* ldapsync context */
 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 } syncprov_info_t;
 142
 143 typedef struct opcookie {
 144         slap_overinst *son;
 145         syncmatches *smatches;
 146         struct berval sdn;      /* DN of entry, for deletes */
 147         struct berval sndn;
 148         struct berval suuid;    /* UUID of entry */
 149         struct berval sctxcsn;
 150         short osid;     /* sid of op csn */
 151         short rsid;     /* sid of relay */
 152         short sreference;       /* Is the entry a reference? */
 153 } opcookie;
 154
 155 typedef struct fbase_cookie {
 156         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 157         syncops *fss;   /* persistent search we're testing against */
 158         int fbase;      /* if TRUE we found the search base and it's still valid */
 159         int fscope;     /* if TRUE then fdn is within the psearch scope */
 160 } fbase_cookie;
 161
 162 static AttributeName csn_anlist[3];
 163 static AttributeName uuid_anlist[2];
 164
 165 /* Build a LDAPsync intermediate state control */
 166 static int
 167 syncprov_state_ctrl(
 168         Operation       *op,
 169         SlapReply       *rs,
 170         Entry           *e,
 171         int             entry_sync_state,
 172         LDAPControl     **ctrls,
 173         int             num_ctrls,
 174         int             send_cookie,
 175         struct berval   *cookie )
 176 {
 177         Attribute* a;
 178         int ret;
 179
 180         BerElementBuffer berbuf;
 181         BerElement *ber = (BerElement *)&berbuf;
 182
 183         struct berval   entryuuid_bv = BER_BVNULL;
 184
 185         ber_init2( ber, 0, LBER_USE_DER );
 186         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 187
 188         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 189
 190         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 191                 AttributeDescription *desc = a->a_desc;
 192                 if ( desc == slap_schema.si_ad_entryUUID ) {
 193                         entryuuid_bv = a->a_nvals[0];
 194                         break;
 195                 }
 196         }
 197
 198         /* FIXME: what if entryuuid is NULL or empty ? */
 199
 200         if ( send_cookie && cookie ) {
 201                 ber_printf( ber, "{eOON}",
 202                         entry_sync_state, &entryuuid_bv, cookie );
 203         } else {
 204                 ber_printf( ber, "{eON}",
 205                         entry_sync_state, &entryuuid_bv );
 206         }
 207
 208         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 209         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 210         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 211
 212         ber_free_buf( ber );
 213
 214         if ( ret < 0 ) {
 215                 Debug( LDAP_DEBUG_TRACE,
 216                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 217                         0, 0, 0 );
 218                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 219                 return ret;
 220         }
 221
 222         return LDAP_SUCCESS;
 223 }
 224
 225 /* Build a LDAPsync final state control */
 226 static int
 227 syncprov_done_ctrl(
 228         Operation       *op,
 229         SlapReply       *rs,
 230         LDAPControl     **ctrls,
 231         int                     num_ctrls,
 232         int                     send_cookie,
 233         struct berval *cookie,
 234         int                     refreshDeletes )
 235 {
 236         int ret;
 237         BerElementBuffer berbuf;
 238         BerElement *ber = (BerElement *)&berbuf;
 239
 240         ber_init2( ber, NULL, LBER_USE_DER );
 241         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 242
 243         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 244
 245         ber_printf( ber, "{" );
 246         if ( send_cookie && cookie ) {
 247                 ber_printf( ber, "O", cookie );
 248         }
 249         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 250                 ber_printf( ber, "b", refreshDeletes );
 251         }
 252         ber_printf( ber, "N}" );
 253
 254         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 255         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 256         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 257
 258         ber_free_buf( ber );
 259
 260         if ( ret < 0 ) {
 261                 Debug( LDAP_DEBUG_TRACE,
 262                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 263                         0, 0, 0 );
 264                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 265                 return ret;
 266         }
 267
 268         return LDAP_SUCCESS;
 269 }
 270
 271 static int
 272 syncprov_sendinfo(
 273         Operation       *op,
 274         SlapReply       *rs,
 275         int                     type,
 276         struct berval *cookie,
 277         int                     refreshDone,
 278         BerVarray       syncUUIDs,
 279         int                     refreshDeletes )
 280 {
 281         BerElementBuffer berbuf;
 282         BerElement *ber = (BerElement *)&berbuf;
 283         struct berval rspdata;
 284
 285         int ret;
 286
 287         ber_init2( ber, NULL, LBER_USE_DER );
 288         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 289
 290         if ( type ) {
 291                 switch ( type ) {
 292                 case LDAP_TAG_SYNC_NEW_COOKIE:
 293                         ber_printf( ber, "tO", type, cookie );
 294                         break;
 295                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 296                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDone == 0 ) {
 302                                 ber_printf( ber, "b", refreshDone );
 303                         }
 304                         ber_printf( ber, "N}" );
 305                         break;
 306                 case LDAP_TAG_SYNC_ID_SET:
 307                         ber_printf( ber, "t{", type );
 308                         if ( cookie ) {
 309                                 ber_printf( ber, "O", cookie );
 310                         }
 311                         if ( refreshDeletes == 1 ) {
 312                                 ber_printf( ber, "b", refreshDeletes );
 313                         }
 314                         ber_printf( ber, "[W]", syncUUIDs );
 315                         ber_printf( ber, "N}" );
 316                         break;
 317                 default:
 318                         Debug( LDAP_DEBUG_TRACE,
 319                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 320                                 type, 0, 0 );
 321                         return LDAP_OTHER;
 322                 }
 323         }
 324
 325         ret = ber_flatten2( ber, &rspdata, 0 );
 326
 327         if ( ret < 0 ) {
 328                 Debug( LDAP_DEBUG_TRACE,
 329                         "syncprov_sendinfo: ber_flatten2 failed\n",
 330                         0, 0, 0 );
 331                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 332                 return ret;
 333         }
 334
 335         rs->sr_rspoid = LDAP_SYNC_INFO;
 336         rs->sr_rspdata = &rspdata;
 337         send_ldap_intermediate( op, rs );
 338         rs->sr_rspdata = NULL;
 339         ber_free_buf( ber );
 340
 341         return LDAP_SUCCESS;
 342 }
 343
 344 /* Find a modtarget in an AVL tree */
 345 static int
 346 sp_avl_cmp( const void *c1, const void *c2 )
 347 {
 348         const modtarget *m1, *m2;
 349         int rc;
 350
 351         m1 = c1; m2 = c2;
 352         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 353
 354         if ( rc ) return rc;
 355         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 356 }
 357
 358 /* syncprov_findbase:
 359  *   finds the true DN of the base of a search (with alias dereferencing) and
 360  * checks to make sure the base entry doesn't get replaced with a different
 361  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 362  * change is detected, any persistent search on this base must be terminated /
 363  * reloaded.
 364  *   On the first call, we just save the DN and entryID. On subsequent calls
 365  * we compare the DN and entryID with the saved values.
 366  */
 367 static int
 368 findbase_cb( Operation *op, SlapReply *rs )
 369 {
 370         slap_callback *sc = op->o_callback;
 371
 372         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 373                 fbase_cookie *fc = sc->sc_private;
 374
 375                 /* If no entryID, we're looking for the first time.
 376                  * Just store whatever we got.
 377                  */
 378                 if ( fc->fss->s_eid == NOID ) {
 379                         fc->fbase = 2;
 380                         fc->fss->s_eid = rs->sr_entry->e_id;
 381                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 382
 383                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 384                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 385
 386                 /* OK, the DN is the same and the entryID is the same. */
 387                         fc->fbase = 1;
 388                 }
 389         }
 390         if ( rs->sr_err != LDAP_SUCCESS ) {
 391                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 392         }
 393         return LDAP_SUCCESS;
 394 }
 395
 396 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 397 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 398
 399 static int
 400 syncprov_findbase( Operation *op, fbase_cookie *fc )
 401 {
 402         /* Use basic parameters from syncrepl search, but use
 403          * current op's threadctx / tmpmemctx
 404          */
 405         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 406         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 407                 slap_callback cb = {0};
 408                 Operation fop;
 409                 SlapReply frs = { REP_RESULT };
 410                 int rc;
 411
 412                 fc->fss->s_flags ^= PS_FIND_BASE;
 413                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 414
 415                 fop = *fc->fss->s_op;
 416
 417                 fop.o_bd = fop.o_bd->bd_self;
 418                 fop.o_hdr = op->o_hdr;
 419                 fop.o_time = op->o_time;
 420                 fop.o_tincr = op->o_tincr;
 421
 422                 cb.sc_response = findbase_cb;
 423                 cb.sc_private = fc;
 424
 425                 fop.o_sync_mode = 0;    /* turn off sync mode */
 426                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 427                 fop.o_callback = &cb;
 428                 fop.o_tag = LDAP_REQ_SEARCH;
 429                 fop.ors_scope = LDAP_SCOPE_BASE;
 430                 fop.ors_limit = NULL;
 431                 fop.ors_slimit = 1;
 432                 fop.ors_tlimit = SLAP_NO_LIMIT;
 433                 fop.ors_attrs = slap_anlist_no_attrs;
 434                 fop.ors_attrsonly = 1;
 435                 fop.ors_filter = &generic_filter;
 436                 fop.ors_filterstr = generic_filterstr;
 437
 438                 rc = fop.o_bd->be_search( &fop, &frs );
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 504                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 505                         maxcsn->bv_len = a->a_vals[0].bv_len;
 506                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 507                 }
 508         }
 509         return LDAP_SUCCESS;
 510 }
 511
 512 static int
 513 findcsn_cb( Operation *op, SlapReply *rs )
 514 {
 515         slap_callback *sc = op->o_callback;
 516
 517         /* We just want to know that at least one exists, so it's OK if
 518          * we exceed the unchecked limit.
 519          */
 520         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 521                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 522                 sc->sc_private = (void *)1;
 523         }
 524         return LDAP_SUCCESS;
 525 }
 526
 527 /* Build a list of entryUUIDs for sending in a SyncID set */
 528
 529 #define UUID_LEN        16
 530
 531 typedef struct fpres_cookie {
 532         int num;
 533         BerVarray uuids;
 534         char *last;
 535 } fpres_cookie;
 536
 537 static int
 538 findpres_cb( Operation *op, SlapReply *rs )
 539 {
 540         slap_callback *sc = op->o_callback;
 541         fpres_cookie *pc = sc->sc_private;
 542         Attribute *a;
 543         int ret = SLAP_CB_CONTINUE;
 544
 545         switch ( rs->sr_type ) {
 546         case REP_SEARCH:
 547                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 548                 if ( a ) {
 549                         pc->uuids[pc->num].bv_val = pc->last;
 550                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 551                                 pc->uuids[pc->num].bv_len );
 552                         pc->num++;
 553                         pc->last = pc->uuids[pc->num].bv_val;
 554                         pc->uuids[pc->num].bv_val = NULL;
 555                 }
 556                 ret = LDAP_SUCCESS;
 557                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 558                         break;
 559                 /* FALLTHRU */
 560         case REP_RESULT:
 561                 ret = rs->sr_err;
 562                 if ( pc->num ) {
 563                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 564                                 0, pc->uuids, 0 );
 565                         pc->uuids[pc->num].bv_val = pc->last;
 566                         pc->num = 0;
 567                         pc->last = pc->uuids[0].bv_val;
 568                 }
 569                 break;
 570         default:
 571                 break;
 572         }
 573         return ret;
 574 }
 575
 576 static int
 577 syncprov_findcsn( Operation *op, find_csn_t mode )
 578 {
 579         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 580         syncprov_info_t         *si = on->on_bi.bi_private;
 581
 582         slap_callback cb = {0};
 583         Operation fop;
 584         SlapReply frs = { REP_RESULT };
 585         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 586         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 587         struct berval maxcsn;
 588         Filter cf;
 589         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 590         fpres_cookie pcookie;
 591         sync_control *srs = NULL;
 592         struct slap_limits_set fc_limits;
 593         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 594         int maxid;
 595
 596         if ( mode != FIND_MAXCSN ) {
 597                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 598         }
 599
 600         fop = *op;
 601         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 602         /* We want pure entries, not referrals */
 603         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 604
 605         cf.f_ava = &eq;
 606         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 607         BER_BVZERO( &cf.f_av_value );
 608         cf.f_next = NULL;
 609
 610         fop.o_callback = &cb;
 611         fop.ors_limit = NULL;
 612         fop.ors_tlimit = SLAP_NO_LIMIT;
 613         fop.ors_filter = &cf;
 614         fop.ors_filterstr.bv_val = buf;
 615
 616 again:
 617         switch( mode ) {
 618         case FIND_MAXCSN:
 619                 cf.f_choice = LDAP_FILTER_GE;
 620                 /* If there are multiple CSNs, use the one with our serverID */
 621                 for ( i=0; i<si->si_numcsns; i++) {
 622                         if ( slap_serverID == si->si_sids[i] ) {
 623                                 maxid = i;
 624                                 break;
 625                         }
 626                 }
 627                 if ( i == si->si_numcsns ) {
 628                         /* No match: this is multimaster, and none of the content in the DB
 629                          * originated locally. Treat like no CSN.
 630                          */
 631                         return LDAP_NO_SUCH_OBJECT;
 632                 }
 633                 cf.f_av_value = si->si_ctxcsn[maxid];
 634                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 635                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 636                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 637                         return LDAP_OTHER;
 638                 }
 639                 fop.ors_attrsonly = 0;
 640                 fop.ors_attrs = csn_anlist;
 641                 fop.ors_slimit = SLAP_NO_LIMIT;
 642                 cb.sc_private = &maxcsn;
 643                 cb.sc_response = findmax_cb;
 644                 strcpy( cbuf, cf.f_av_value.bv_val );
 645                 maxcsn.bv_val = cbuf;
 646                 maxcsn.bv_len = cf.f_av_value.bv_len;
 647                 break;
 648         case FIND_CSN:
 649                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 650                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 651                         /* If there are multiple CSNs, use the smallest */
 652                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 653                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 654                                         > 0 ) {
 655                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 656                                 }
 657                         }
 658                 }
 659                 /* Look for exact match the first time */
 660                 if ( findcsn_retry ) {
 661                         cf.f_choice = LDAP_FILTER_EQUALITY;
 662                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 663                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 664                 /* On retry, look for <= */
 665                 } else {
 666                         cf.f_choice = LDAP_FILTER_LE;
 667                         fop.ors_limit = &fc_limits;
 668                         memset( &fc_limits, 0, sizeof( fc_limits ));
 669                         fc_limits.lms_s_unchecked = 1;
 670                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 671                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 672                 }
 673                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 674                         return LDAP_OTHER;
 675                 }
 676                 fop.ors_attrsonly = 1;
 677                 fop.ors_attrs = slap_anlist_no_attrs;
 678                 fop.ors_slimit = 1;
 679                 cb.sc_private = NULL;
 680                 cb.sc_response = findcsn_cb;
 681                 break;
 682         case FIND_PRESENT:
 683                 fop.ors_filter = op->ors_filter;
 684                 fop.ors_filterstr = op->ors_filterstr;
 685                 fop.ors_attrsonly = 0;
 686                 fop.ors_attrs = uuid_anlist;
 687                 fop.ors_slimit = SLAP_NO_LIMIT;
 688                 cb.sc_private = &pcookie;
 689                 cb.sc_response = findpres_cb;
 690                 pcookie.num = 0;
 691
 692                 /* preallocate storage for a full set */
 693                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 694                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 695                         op->o_tmpmemctx );
 696                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 697                 pcookie.uuids[0].bv_val = pcookie.last;
 698                 pcookie.uuids[0].bv_len = UUID_LEN;
 699                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 700                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 701                         pcookie.uuids[i].bv_len = UUID_LEN;
 702                 }
 703                 break;
 704         }
 705
 706         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 707         fop.o_bd->be_search( &fop, &frs );
 708         fop.o_bd->bd_info = (BackendInfo *)on;
 709
 710         switch( mode ) {
 711         case FIND_MAXCSN:
 712                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 713 #ifdef CHECK_CSN
 714                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 715                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 716 #endif
 717                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 718                         si->si_numops++;        /* ensure a checkpoint */
 719                 }
 720                 break;
 721         case FIND_CSN:
 722                 /* If matching CSN was not found, invalidate the context. */
 723                 if ( !cb.sc_private ) {
 724                         /* If we didn't find an exact match, then try for <= */
 725                         if ( findcsn_retry ) {
 726                                 findcsn_retry = 0;
 727                                 goto again;
 728                         }
 729                         rc = LDAP_NO_SUCH_OBJECT;
 730                 }
 731                 break;
 732         case FIND_PRESENT:
 733                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 734                 break;
 735         }
 736
 737         return rc;
 738 }
 739
 740 static void
 741 syncprov_free_syncop( syncops *so )
 742 {
 743         syncres *sr, *srnext;
 744         GroupAssertion *ga, *gnext;
 745
 746         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 747         if ( --so->s_inuse > 0 ) {
 748                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 749                 return;
 750         }
 751         if ( so->s_qtask ) {
 752                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 753                 if ( ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) )
 754                         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 755                 ldap_pvt_runqueue_remove( &slapd_rq, so->s_qtask );
 756                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 757         }
 758         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 759         if ( so->s_flags & PS_IS_DETACHED ) {
 760                 filter_free( so->s_op->ors_filter );
 761                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 762                         gnext = ga->ga_next;
 763                         ch_free( ga );
 764                 }
 765                 ch_free( so->s_op );
 766         }
 767         ch_free( so->s_base.bv_val );
 768         for ( sr=so->s_res; sr; sr=srnext ) {
 769                 srnext = sr->s_next;
 770                 ch_free( sr );
 771         }
 772         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 773         ch_free( so );
 774 }
 775
 776 /* Send a persistent search response */
 777 static int
 778 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 779         Entry **e, int mode )
 780 {
 781         slap_overinst *on = opc->son;
 782
 783         SlapReply rs = { REP_SEARCH };
 784         LDAPControl *ctrls[2];
 785         struct berval cookie, csns[2];
 786         Entry e_uuid = {0};
 787         Attribute a_uuid = {0};
 788
 789         if ( so->s_op->o_abandon )
 790                 return SLAPD_ABANDON;
 791
 792         ctrls[1] = NULL;
 793         csns[0] = opc->sctxcsn;
 794         BER_BVZERO( &csns[1] );
 795         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 796
 797 #ifdef LDAP_DEBUG
 798         if ( so->s_sid > 0 ) {
 799                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 800                         so->s_sid, cookie.bv_val, 0 );
 801         } else {
 802                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 803                         cookie.bv_val, 0, 0 );
 804         }
 805 #endif
 806
 807         e_uuid.e_attrs = &a_uuid;
 808         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 809         a_uuid.a_nvals = &opc->suuid;
 810         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 811                 mode, ctrls, 0, 1, &cookie );
 812         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 813
 814         rs.sr_ctrls = ctrls;
 815         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 816         switch( mode ) {
 817         case LDAP_SYNC_ADD:
 818                 rs.sr_entry = *e;
 819                 if ( rs.sr_entry->e_private )
 820                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 821                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 822                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 823                         rs.sr_err = send_search_reference( op, &rs );
 824                         ber_bvarray_free( rs.sr_ref );
 825                         if ( !rs.sr_entry )
 826                                 *e = NULL;
 827                         break;
 828                 }
 829                 /* fallthru */
 830         case LDAP_SYNC_MODIFY:
 831                 rs.sr_entry = *e;
 832                 if ( rs.sr_entry->e_private )
 833                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 834                 rs.sr_attrs = op->ors_attrs;
 835                 rs.sr_err = send_search_entry( op, &rs );
 836                 if ( !rs.sr_entry )
 837                         *e = NULL;
 838                 break;
 839         case LDAP_SYNC_DELETE:
 840                 e_uuid.e_attrs = NULL;
 841                 e_uuid.e_name = opc->sdn;
 842                 e_uuid.e_nname = opc->sndn;
 843                 rs.sr_entry = &e_uuid;
 844                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 845                         struct berval bv = BER_BVNULL;
 846                         rs.sr_ref = &bv;
 847                         rs.sr_err = send_search_reference( op, &rs );
 848                 } else {
 849                         rs.sr_err = send_search_entry( op, &rs );
 850                 }
 851                 break;
 852         default:
 853                 assert(0);
 854         }
 855         /* In case someone else freed it already? */
 856         if ( rs.sr_ctrls ) {
 857                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 858                 rs.sr_ctrls = NULL;
 859         }
 860
 861         return rs.sr_err;
 862 }
 863
 864 /* Play back queued responses */
 865 static int
 866 syncprov_qplay( Operation *op, struct re_s *rtask )
 867 {
 868         syncops *so = rtask->arg;
 869         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 870         syncres *sr;
 871         Entry *e;
 872         opcookie opc;
 873         int rc = 0;
 874
 875         opc.son = on;
 876
 877         for (;;) {
 878                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 879                 sr = so->s_res;
 880                 if ( sr )
 881                         so->s_res = sr->s_next;
 882                 if ( !so->s_res )
 883                         so->s_restail = NULL;
 884                 /* Exit loop with mutex held */
 885                 if ( !sr || so->s_op->o_abandon )
 886                         break;
 887                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 888
 889                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 890                     SlapReply rs = { REP_INTERMEDIATE };
 891
 892                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 893                                 &sr->s_csn, 0, NULL, 0 );
 894                 } else {
 895                         opc.sdn = sr->s_dn;
 896                         opc.sndn = sr->s_ndn;
 897                         opc.suuid = sr->s_uuid;
 898                         opc.sctxcsn = sr->s_csn;
 899                         opc.sreference = sr->s_isreference;
 900                         e = NULL;
 901
 902                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 903                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 904                                 if ( rc ) {
 905                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 906                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 907                                         ch_free( sr );
 908                                         rc = 0;
 909                                         continue;
 910                                 }
 911                         }
 912                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 913
 914                         if ( e ) {
 915                                 overlay_entry_release_ov( op, e, 0, on );
 916                         }
 917                 }
 918
 919                 ch_free( sr );
 920
 921                 if ( rc ) {
 922                         /* Exit loop with mutex held */
 923                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 924                         break;
 925                 }
 926         }
 927
 928         /* wait until we get explicitly scheduled again */
 929         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 930         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 931         if ( rc == 0 ) {
 932                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 933         } else {
 934                 /* bail out on any error */
 935                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 936
 937                 /* Prevent duplicate remove */
 938                 if ( so->s_qtask == rtask )
 939                         so->s_qtask = NULL;
 940         }
 941         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 942         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 943         return rc;
 944 }
 945
 946 /* runqueue task for playing back queued responses */
 947 static void *
 948 syncprov_qtask( void *ctx, void *arg )
 949 {
 950         struct re_s *rtask = arg;
 951         syncops *so = rtask->arg;
 952         OperationBuffer opbuf;
 953         Operation *op;
 954         BackendDB be;
 955         int rc;
 956
 957         op = &opbuf.ob_op;
 958         *op = *so->s_op;
 959         op->o_hdr = &opbuf.ob_hdr;
 960         op->o_controls = opbuf.ob_controls;
 961         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 962
 963         *op->o_hdr = *so->s_op->o_hdr;
 964
 965         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 966         op->o_tmpmfuncs = &slap_sl_mfuncs;
 967         op->o_threadctx = ctx;
 968
 969         /* syncprov_qplay expects a fake db */
 970         be = *so->s_op->o_bd;
 971         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 972         op->o_bd = &be;
 973         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 974         op->o_callback = NULL;
 975
 976         rc = syncprov_qplay( op, rtask );
 977
 978         /* decrement use count... */
 979         syncprov_free_syncop( so );
 980
 981 #if 0   /* FIXME: connection_close isn't exported from slapd.
 982                  * should it be?
 983                  */
 984         if ( rc ) {
 985                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 986                 if ( connection_state_closing( op->o_conn )) {
 987                         connection_close( op->o_conn );
 988                 }
 989                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 990         }
 991 #endif
 992         return NULL;
 993 }
 994
 995 /* Start the task to play back queued psearch responses */
 996 static void
 997 syncprov_qstart( syncops *so )
 998 {
 999         int wake=0;
1000         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
1001         if ( !so->s_qtask ) {
1002                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
1003                         syncprov_qtask, so, "syncprov_qtask",
1004                         so->s_op->o_conn->c_peer_name.bv_val );
1005                 ++so->s_inuse;
1006                 wake = 1;
1007         } else {
1008                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
1009                         !so->s_qtask->next_sched.tv_sec ) {
1010                         so->s_qtask->interval.tv_sec = 0;
1011                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
1012                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
1013                         ++so->s_inuse;
1014                         wake = 1;
1015                 }
1016         }
1017         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
1018         if ( wake )
1019                 slap_wake_listener();
1020 }
1021
1022 /* Queue a persistent search response */
1023 static int
1024 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1025 {
1026         syncres *sr;
1027         int srsize;
1028         struct berval cookie = opc->sctxcsn;
1029
1030         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1031                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1032
1033                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1034                         so->s_rid, slap_serverID ? slap_serverID : -1);
1035         }
1036
1037         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1038                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1039         if ( cookie.bv_len )
1040                 srsize += cookie.bv_len + 1;
1041         sr = ch_malloc( srsize );
1042         sr->s_next = NULL;
1043         sr->s_dn.bv_val = (char *)(sr + 1);
1044         sr->s_dn.bv_len = opc->sdn.bv_len;
1045         sr->s_mode = mode;
1046         sr->s_isreference = opc->sreference;
1047         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1048                  opc->sdn.bv_val ) + 1;
1049         sr->s_ndn.bv_len = opc->sndn.bv_len;
1050         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1051                  opc->sndn.bv_val ) + 1;
1052         sr->s_uuid.bv_len = opc->suuid.bv_len;
1053         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1054         if ( cookie.bv_len ) {
1055                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1056                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1057         } else {
1058                 sr->s_csn.bv_val = NULL;
1059         }
1060         sr->s_csn.bv_len = cookie.bv_len;
1061
1062         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1063                 ch_free( cookie.bv_val );
1064         }
1065
1066         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1067         if ( !so->s_res ) {
1068                 so->s_res = sr;
1069         } else {
1070                 so->s_restail->s_next = sr;
1071         }
1072         so->s_restail = sr;
1073
1074         /* If the base of the psearch was modified, check it next time round */
1075         if ( so->s_flags & PS_WROTE_BASE ) {
1076                 so->s_flags ^= PS_WROTE_BASE;
1077                 so->s_flags |= PS_FIND_BASE;
1078         }
1079         if ( so->s_flags & PS_IS_DETACHED ) {
1080                 syncprov_qstart( so );
1081         }
1082         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1083         return LDAP_SUCCESS;
1084 }
1085
1086 static int
1087 syncprov_drop_psearch( syncops *so, int lock )
1088 {
1089         if ( so->s_flags & PS_IS_DETACHED ) {
1090                 if ( lock )
1091                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1092                 so->s_op->o_conn->c_n_ops_executing--;
1093                 so->s_op->o_conn->c_n_ops_completed++;
1094                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1095                         o_next );
1096                 if ( lock )
1097                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1098         }
1099         syncprov_free_syncop( so );
1100
1101         return 0;
1102 }
1103
1104 static int
1105 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1106 {
1107         slap_callback *sc = op->o_callback;
1108         op->o_callback = sc->sc_next;
1109         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1110         op->o_tmpfree( sc, op->o_tmpmemctx );
1111         return 0;
1112 }
1113
1114 static int
1115 syncprov_op_abandon( Operation *op, SlapReply *rs )
1116 {
1117         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1118         syncprov_info_t         *si = on->on_bi.bi_private;
1119         syncops *so, *soprev;
1120
1121         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1122         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1123                 soprev=so, so=so->s_next ) {
1124                 if ( so->s_op->o_connid == op->o_connid &&
1125                         so->s_op->o_msgid == op->orn_msgid ) {
1126                                 so->s_op->o_abandon = 1;
1127                                 soprev->s_next = so->s_next;
1128                                 break;
1129                 }
1130         }
1131         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1132         if ( so ) {
1133                 /* Is this really a Cancel exop? */
1134                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1135                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1136                         rs->sr_err = LDAP_CANCELLED;
1137                         send_ldap_result( so->s_op, rs );
1138                         if ( so->s_flags & PS_IS_DETACHED ) {
1139                                 slap_callback *cb;
1140                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1141                                 cb->sc_cleanup = syncprov_ab_cleanup;
1142                                 cb->sc_next = op->o_callback;
1143                                 cb->sc_private = so;
1144                                 return SLAP_CB_CONTINUE;
1145                         }
1146                 }
1147                 syncprov_drop_psearch( so, 0 );
1148         }
1149         return SLAP_CB_CONTINUE;
1150 }
1151
1152 /* Find which persistent searches are affected by this operation */
1153 static void
1154 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1155 {
1156         slap_overinst *on = opc->son;
1157         syncprov_info_t         *si = on->on_bi.bi_private;
1158
1159         fbase_cookie fc;
1160         syncops *ss, *sprev, *snext;
1161         Entry *e = NULL;
1162         Attribute *a;
1163         int rc;
1164         struct berval newdn;
1165         int freefdn = 0;
1166         BackendDB *b0 = op->o_bd, db;
1167
1168         fc.fdn = &op->o_req_ndn;
1169         /* compute new DN */
1170         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1171                 struct berval pdn;
1172                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1173                 else dnParent( fc.fdn, &pdn );
1174                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1175                 fc.fdn = &newdn;
1176                 freefdn = 1;
1177         }
1178         if ( op->o_tag != LDAP_REQ_ADD ) {
1179                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1180                         db = *op->o_bd;
1181                         op->o_bd = &db;
1182                 }
1183                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1184                 /* If we're sending responses now, make a copy and unlock the DB */
1185                 if ( e && !saveit ) {
1186                         Entry *e2 = entry_dup( e );
1187                         overlay_entry_release_ov( op, e, 0, on );
1188                         e = e2;
1189                 }
1190                 if ( rc ) {
1191                         op->o_bd = b0;
1192                         return;
1193                 }
1194         } else {
1195                 e = op->ora_e;
1196         }
1197
1198         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1199                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1200                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1201                 opc->sreference = is_entry_referral( e );
1202                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1203                 if ( a )
1204                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1205         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1206                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1207                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1208                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1209                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1210         }
1211
1212         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1213         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1214                 sprev = ss, ss=snext)
1215         {
1216                 Operation op2;
1217                 Opheader oh;
1218                 syncmatches *sm;
1219                 int found = 0;
1220
1221                 snext = ss->s_next;
1222                 if ( ss->s_op->o_abandon )
1223                         continue;
1224
1225                 /* First time thru, check for possible skips */
1226                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1227
1228                         /* Don't send ops back to the originator */
1229                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1230                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1231                                         opc->osid, 0, 0 );
1232                                 continue;
1233                         }
1234
1235                         /* Don't send ops back to the messenger */
1236                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1237                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1238                                         opc->rsid, 0, 0 );
1239                                 continue;
1240                         }
1241                 }
1242
1243                 /* validate base */
1244                 fc.fss = ss;
1245                 fc.fbase = 0;
1246                 fc.fscope = 0;
1247
1248                 /* If the base of the search is missing, signal a refresh */
1249                 rc = syncprov_findbase( op, &fc );
1250                 if ( rc != LDAP_SUCCESS ) {
1251                         SlapReply rs = {REP_RESULT};
1252                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1253                                 "search base has changed" );
1254                         sprev->s_next = snext;
1255                         syncprov_drop_psearch( ss, 1 );
1256                         ss = sprev;
1257                         continue;
1258                 }
1259
1260
1261                 /* If we're sending results now, look for this op in old matches */
1262                 if ( !saveit ) {
1263                         syncmatches *old;
1264
1265                         /* Did we modify the search base? */
1266                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1267                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1268                                 ss->s_flags |= PS_WROTE_BASE;
1269                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1270                         }
1271
1272                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1273                                 old=sm, sm=sm->sm_next ) {
1274                                 if ( sm->sm_op == ss ) {
1275                                         found = 1;
1276                                         old->sm_next = sm->sm_next;
1277                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1278                                         break;
1279                                 }
1280                         }
1281                 }
1282
1283                 if ( fc.fscope ) {
1284                         op2 = *ss->s_op;
1285                         oh = *op->o_hdr;
1286                         oh.oh_conn = ss->s_op->o_conn;
1287                         oh.oh_connid = ss->s_op->o_connid;
1288                         op2.o_hdr = &oh;
1289                         op2.o_extra = op->o_extra;
1290                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1291                 }
1292
1293                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1294                         ss->s_sid, fc.fscope, rc );
1295
1296                 /* check if current o_req_dn is in scope and matches filter */
1297                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1298                         if ( saveit ) {
1299                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1300                                 sm->sm_next = opc->smatches;
1301                                 sm->sm_op = ss;
1302                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1303                                 ++ss->s_inuse;
1304                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1305                                 opc->smatches = sm;
1306                         } else {
1307                                 /* if found send UPDATE else send ADD */
1308                                 syncprov_qresp( opc, ss,
1309                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1310                         }
1311                 } else if ( !saveit && found ) {
1312                         /* send DELETE */
1313                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1314                 } else if ( !saveit ) {
1315                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1316                 }
1317                 if ( !saveit && found ) {
1318                         /* Decrement s_inuse, was incremented when called
1319                          * with saveit == TRUE
1320                          */
1321                         syncprov_free_syncop( ss );
1322                 }
1323         }
1324         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1325
1326         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1327                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1328                         op->o_bd = &db;
1329                 }
1330                 overlay_entry_release_ov( op, e, 0, on );
1331                 op->o_bd = b0;
1332         }
1333         if ( freefdn ) {
1334                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1335         }
1336         op->o_bd = b0;
1337 }
1338
1339 static int
1340 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1341 {
1342         slap_callback *cb = op->o_callback;
1343         opcookie *opc = cb->sc_private;
1344         slap_overinst *on = opc->son;
1345         syncprov_info_t         *si = on->on_bi.bi_private;
1346         syncmatches *sm, *snext;
1347         modtarget *mt, mtdummy;
1348
1349         for (sm = opc->smatches; sm; sm=snext) {
1350                 snext = sm->sm_next;
1351                 syncprov_free_syncop( sm->sm_op );
1352                 op->o_tmpfree( sm, op->o_tmpmemctx );
1353         }
1354
1355         /* Remove op from lock table */
1356         mtdummy.mt_op = op;
1357         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1358         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1359         if ( mt ) {
1360                 modinst *mi = mt->mt_mods;
1361
1362                 /* If there are more, promote the next one */
1363                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1364                 if ( mi->mi_next ) {
1365                         mt->mt_mods = mi->mi_next;
1366                         mt->mt_op = mt->mt_mods->mi_op;
1367                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1368                 } else {
1369                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1370                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1371                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1372                         ch_free( mt );
1373                 }
1374         }
1375         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1376         if ( !BER_BVISNULL( &opc->suuid ))
1377                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1378         if ( !BER_BVISNULL( &opc->sndn ))
1379                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1380         if ( !BER_BVISNULL( &opc->sdn ))
1381                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1382         op->o_callback = cb->sc_next;
1383         op->o_tmpfree(cb, op->o_tmpmemctx);
1384
1385         return 0;
1386 }
1387
1388 static void
1389 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1390 {
1391         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1392         Modifications mod;
1393         Operation opm;
1394         SlapReply rsm = { 0 };
1395         slap_callback cb = {0};
1396         BackendDB be;
1397 #ifdef CHECK_CSN
1398         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1399
1400         int i;
1401         for ( i=0; i<si->si_numcsns; i++ ) {
1402                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1403         }
1404 #endif
1405         mod.sml_numvals = si->si_numcsns;
1406         mod.sml_values = si->si_ctxcsn;
1407         mod.sml_nvalues = NULL;
1408         mod.sml_desc = slap_schema.si_ad_contextCSN;
1409         mod.sml_op = LDAP_MOD_REPLACE;
1410         mod.sml_flags = SLAP_MOD_INTERNAL;
1411         mod.sml_next = NULL;
1412
1413         cb.sc_response = slap_null_cb;
1414         opm = *op;
1415         opm.o_tag = LDAP_REQ_MODIFY;
1416         opm.o_callback = &cb;
1417         opm.orm_modlist = &mod;
1418         opm.orm_no_opattrs = 1;
1419         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1420                 be = *on->on_info->oi_origdb;
1421                 opm.o_bd = &be;
1422         }
1423         opm.o_req_dn = opm.o_bd->be_suffix[0];
1424         opm.o_req_ndn = opm.o_bd->be_nsuffix[0];
1425         opm.o_bd->bd_info = on->on_info->oi_orig;
1426         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1427         opm.o_no_schema_check = 1;
1428         opm.o_bd->be_modify( &opm, &rsm );
1429         if ( mod.sml_next != NULL ) {
1430                 slap_mods_free( mod.sml_next, 1 );
1431         }
1432 #ifdef CHECK_CSN
1433         for ( i=0; i<si->si_numcsns; i++ ) {
1434                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1435         }
1436 #endif
1437 }
1438
1439 static void
1440 syncprov_add_slog( Operation *op )
1441 {
1442         opcookie *opc = op->o_callback->sc_private;
1443         slap_overinst *on = opc->son;
1444         syncprov_info_t         *si = on->on_bi.bi_private;
1445         sessionlog *sl;
1446         slog_entry *se;
1447
1448         sl = si->si_logs;
1449         {
1450                 /* Allocate a record. UUIDs are not NUL-terminated. */
1451                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1452                         op->o_csn.bv_len + 1 );
1453                 se->se_next = NULL;
1454                 se->se_tag = op->o_tag;
1455
1456                 se->se_uuid.bv_val = (char *)(&se[1]);
1457                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1458                 se->se_uuid.bv_len = opc->suuid.bv_len;
1459
1460                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1461                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1462                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1463                 se->se_csn.bv_len = op->o_csn.bv_len;
1464                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1465
1466                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1467                 if ( sl->sl_head ) {
1468                         sl->sl_tail->se_next = se;
1469                 } else {
1470                         sl->sl_head = se;
1471                 }
1472                 sl->sl_tail = se;
1473                 sl->sl_num++;
1474                 while ( sl->sl_num > sl->sl_size ) {
1475                         se = sl->sl_head;
1476                         sl->sl_head = se->se_next;
1477                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1478                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1479                         ch_free( se );
1480                         sl->sl_num--;
1481                 }
1482                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1483         }
1484 }
1485
1486 /* Just set a flag if we found the matching entry */
1487 static int
1488 playlog_cb( Operation *op, SlapReply *rs )
1489 {
1490         if ( rs->sr_type == REP_SEARCH ) {
1491                 op->o_callback->sc_private = (void *)1;
1492         }
1493         return rs->sr_err;
1494 }
1495
1496 /* enter with sl->sl_mutex locked, release before returning */
1497 static void
1498 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1499         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1500 {
1501         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1502         slog_entry *se;
1503         int i, j, ndel, num, nmods, mmods;
1504         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1505         BerVarray uuids;
1506         struct berval delcsn[2];
1507
1508         if ( !sl->sl_num ) {
1509                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1510                 return;
1511         }
1512
1513         num = sl->sl_num;
1514         i = 0;
1515         nmods = 0;
1516
1517         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1518                 num * UUID_LEN, op->o_tmpmemctx );
1519         uuids[0].bv_val = (char *)(uuids + num + 1);
1520
1521         delcsn[0].bv_len = 0;
1522         delcsn[0].bv_val = cbuf;
1523         BER_BVZERO(&delcsn[1]);
1524
1525         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1526          * and everything else at the end. Do this first so we can
1527          * unlock the list mutex.
1528          */
1529         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1530                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1531         for ( se=sl->sl_head; se; se=se->se_next ) {
1532                 int k;
1533                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1534                 ndel = 1;
1535                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1536                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1537                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1538                                 break;
1539                         }
1540                 }
1541                 if ( ndel <= 0 ) {
1542                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1543                         continue;
1544                 }
1545                 ndel = 0;
1546                 for ( k=0; k<numcsns; k++ ) {
1547                         if ( se->se_sid == sids[k] ) {
1548                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1549                                 break;
1550                         }
1551                 }
1552                 if ( ndel > 0 ) {
1553                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1554                         break;
1555                 }
1556                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1557                         j = i;
1558                         i++;
1559                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1560                         delcsn[0].bv_len = se->se_csn.bv_len;
1561                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1562                 } else {
1563                         nmods++;
1564                         j = num - nmods;
1565                 }
1566                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1567                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1568                 uuids[j].bv_len = UUID_LEN;
1569         }
1570         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1571
1572         ndel = i;
1573
1574         /* Zero out unused slots */
1575         for ( i=ndel; i < num - nmods; i++ )
1576                 uuids[i].bv_len = 0;
1577
1578         /* Mods must be validated to see if they belong in this delete set.
1579          */
1580
1581         mmods = nmods;
1582         /* Strip any duplicates */
1583         for ( i=0; i<nmods; i++ ) {
1584                 for ( j=0; j<ndel; j++ ) {
1585                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1586                                 uuids[num - 1 - i].bv_len = 0;
1587                                 mmods --;
1588                                 break;
1589                         }
1590                 }
1591                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1592                 for ( j=0; j<i; j++ ) {
1593                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1594                                 uuids[num - 1 - i].bv_len = 0;
1595                                 mmods --;
1596                                 break;
1597                         }
1598                 }
1599         }
1600
1601         if ( mmods ) {
1602                 Operation fop;
1603                 SlapReply frs = { REP_RESULT };
1604                 int rc;
1605                 Filter mf, af;
1606                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1607                 slap_callback cb = {0};
1608
1609                 fop = *op;
1610
1611                 fop.o_sync_mode = 0;
1612                 fop.o_callback = &cb;
1613                 fop.ors_limit = NULL;
1614                 fop.ors_tlimit = SLAP_NO_LIMIT;
1615                 fop.ors_attrs = slap_anlist_all_attributes;
1616                 fop.ors_attrsonly = 0;
1617                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1618
1619                 af.f_choice = LDAP_FILTER_AND;
1620                 af.f_next = NULL;
1621                 af.f_and = &mf;
1622                 mf.f_choice = LDAP_FILTER_EQUALITY;
1623                 mf.f_ava = &eq;
1624                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1625                 mf.f_next = fop.ors_filter;
1626
1627                 fop.ors_filter = &af;
1628
1629                 cb.sc_response = playlog_cb;
1630                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1631
1632                 for ( i=ndel; i<num; i++ ) {
1633                         if ( uuids[i].bv_len == 0 ) continue;
1634
1635                         mf.f_av_value = uuids[i];
1636                         cb.sc_private = NULL;
1637                         fop.ors_slimit = 1;
1638                         frs.sr_nentries = 0;
1639                         rc = fop.o_bd->be_search( &fop, &frs );
1640
1641                         /* If entry was not found, add to delete list */
1642                         if ( !cb.sc_private ) {
1643                                 uuids[ndel++] = uuids[i];
1644                         }
1645                 }
1646                 fop.o_bd->bd_info = (BackendInfo *)on;
1647         }
1648         if ( ndel ) {
1649                 struct berval cookie;
1650
1651                 if ( delcsn[0].bv_len ) {
1652                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1653                                 slap_serverID ? slap_serverID : -1 );
1654
1655                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1656                 }
1657
1658                 uuids[ndel].bv_val = NULL;
1659                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1660                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1661                 if ( delcsn[0].bv_len ) {
1662                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1663                 }
1664         }
1665         op->o_tmpfree( uuids, op->o_tmpmemctx );
1666 }
1667
1668 static int
1669 syncprov_op_response( Operation *op, SlapReply *rs )
1670 {
1671         opcookie *opc = op->o_callback->sc_private;
1672         slap_overinst *on = opc->son;
1673         syncprov_info_t         *si = on->on_bi.bi_private;
1674         syncmatches *sm;
1675
1676         if ( rs->sr_err == LDAP_SUCCESS )
1677         {
1678                 struct berval maxcsn;
1679                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1680                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1681
1682                 /* Update our context CSN */
1683                 cbuf[0] = '\0';
1684                 maxcsn.bv_val = cbuf;
1685                 maxcsn.bv_len = sizeof(cbuf);
1686                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1687
1688                 slap_get_commit_csn( op, &maxcsn, &foundit );
1689                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1690                         /* syncrepl queues the CSN values in the db where
1691                          * it is configured , not where the changes are made.
1692                          * So look for a value in the glue db if we didn't
1693                          * find any in this db.
1694                          */
1695                         BackendDB *be = op->o_bd;
1696                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1697                         maxcsn.bv_val = cbuf;
1698                         maxcsn.bv_len = sizeof(cbuf);
1699                         slap_get_commit_csn( op, &maxcsn, &foundit );
1700                         op->o_bd = be;
1701                 }
1702                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1703                         int i, sid;
1704 #ifdef CHECK_CSN
1705                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1706                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1707 #endif
1708                         sid = slap_parse_csn_sid( &maxcsn );
1709                         for ( i=0; i<si->si_numcsns; i++ ) {
1710                                 if ( sid == si->si_sids[i] ) {
1711                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1712                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1713                                                 csn_changed = 1;
1714                                         }
1715                                         break;
1716                                 }
1717                         }
1718                         /* It's a new SID for us */
1719                         if ( i == si->si_numcsns ) {
1720                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1721                                 csn_changed = 1;
1722                                 si->si_numcsns++;
1723                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1724                                         sizeof(int));
1725                                 si->si_sids[i] = sid;
1726                         }
1727                 } else if ( !foundit ) {
1728                         /* internal ops that aren't meant to be replicated */
1729                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1730                         return SLAP_CB_CONTINUE;
1731                 }
1732
1733                 /* Don't do any processing for consumer contextCSN updates */
1734                 if ( op->o_dont_replicate ) {
1735                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1736                         return SLAP_CB_CONTINUE;
1737                 }
1738
1739                 si->si_numops++;
1740                 if ( si->si_chkops || si->si_chktime ) {
1741                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1742                                 do_check = 1;
1743                                 si->si_numops = 0;
1744                         }
1745                         if ( si->si_chktime &&
1746                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1747                                 if ( si->si_chklast ) {
1748                                         do_check = 1;
1749                                         si->si_chklast = op->o_time;
1750                                 } else {
1751                                         si->si_chklast = 1;
1752                                 }
1753                         }
1754                 }
1755                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1756
1757                 if ( do_check ) {
1758                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1759                         syncprov_checkpoint( op, rs, on );
1760                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1761                 }
1762
1763                 /* only update consumer ctx if this is a newer csn */
1764                 if ( csn_changed ) {
1765                         opc->sctxcsn = maxcsn;
1766                 }
1767
1768                 /* Handle any persistent searches */
1769                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1770                 have_psearches = ( si->si_ops != NULL );
1771                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1772                 if ( have_psearches ) {
1773                         switch(op->o_tag) {
1774                         case LDAP_REQ_ADD:
1775                         case LDAP_REQ_MODIFY:
1776                         case LDAP_REQ_MODRDN:
1777                         case LDAP_REQ_EXTENDED:
1778                                 syncprov_matchops( op, opc, 0 );
1779                                 break;
1780                         case LDAP_REQ_DELETE:
1781                                 /* for each match in opc->smatches:
1782                                  *   send DELETE msg
1783                                  */
1784                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1785                                         if ( sm->sm_op->s_op->o_abandon )
1786                                                 continue;
1787                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1788                                 }
1789                                 break;
1790                         }
1791                 }
1792
1793                 /* Add any log records */
1794                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1795                         syncprov_add_slog( op );
1796                 }
1797
1798         }
1799         return SLAP_CB_CONTINUE;
1800 }
1801
1802 /* We don't use a subentry to store the context CSN any more.
1803  * We expose the current context CSN as an operational attribute
1804  * of the suffix entry.
1805  */
1806 static int
1807 syncprov_op_compare( Operation *op, SlapReply *rs )
1808 {
1809         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1810         syncprov_info_t         *si = on->on_bi.bi_private;
1811         int rc = SLAP_CB_CONTINUE;
1812
1813         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1814                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1815         {
1816                 Entry e = {0};
1817                 Attribute a = {0};
1818
1819                 e.e_name = op->o_bd->be_suffix[0];
1820                 e.e_nname = op->o_bd->be_nsuffix[0];
1821                 e.e_attrs = &a;
1822
1823                 a.a_desc = slap_schema.si_ad_contextCSN;
1824
1825                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1826
1827                 a.a_vals = si->si_ctxcsn;
1828                 a.a_nvals = a.a_vals;
1829                 a.a_numvals = si->si_numcsns;
1830
1831                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1832                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1833                 if ( ! rs->sr_err ) {
1834                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1835                         goto return_results;
1836                 }
1837
1838                 if ( get_assert( op ) &&
1839                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1840                 {
1841                         rs->sr_err = LDAP_ASSERTION_FAILED;
1842                         goto return_results;
1843                 }
1844
1845
1846                 rs->sr_err = LDAP_COMPARE_FALSE;
1847
1848                 if ( attr_valfind( &a,
1849                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1850                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1851                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1852                 {
1853                         rs->sr_err = LDAP_COMPARE_TRUE;
1854                 }
1855
1856 return_results:;
1857
1858                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1859
1860                 send_ldap_result( op, rs );
1861
1862                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1863                         rs->sr_err = LDAP_SUCCESS;
1864                 }
1865                 rc = rs->sr_err;
1866         }
1867
1868         return rc;
1869 }
1870
1871 static int
1872 syncprov_op_mod( Operation *op, SlapReply *rs )
1873 {
1874         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1875         syncprov_info_t         *si = on->on_bi.bi_private;
1876         slap_callback *cb;
1877         opcookie *opc;
1878         int have_psearches, cbsize;
1879
1880         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1881         have_psearches = ( si->si_ops != NULL );
1882         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1883
1884         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1885                 (have_psearches ? sizeof(modinst) : 0 );
1886
1887         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1888         opc = (opcookie *)(cb+1);
1889         opc->son = on;
1890         cb->sc_response = syncprov_op_response;
1891         cb->sc_cleanup = syncprov_op_cleanup;
1892         cb->sc_private = opc;
1893         cb->sc_next = op->o_callback;
1894         op->o_callback = cb;
1895
1896         opc->osid = -1;
1897         opc->rsid = -1;
1898         if ( op->o_csn.bv_val ) {
1899                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1900         }
1901         if ( op->o_controls ) {
1902                 struct sync_cookie *scook =
1903                 op->o_controls[slap_cids.sc_LDAPsync];
1904                 if ( scook )
1905                         opc->rsid = scook->sid;
1906         }
1907
1908         /* If there are active persistent searches, lock this operation.
1909          * See seqmod.c for the locking logic on its own.
1910          */
1911         if ( have_psearches ) {
1912                 modtarget *mt, mtdummy;
1913                 modinst *mi;
1914
1915                 mi = (modinst *)(opc+1);
1916                 mi->mi_op = op;
1917
1918                 /* See if we're already modifying this entry... */
1919                 mtdummy.mt_op = op;
1920                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1921                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1922                 if ( mt ) {
1923                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1924                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1925                         mt->mt_tail->mi_next = mi;
1926                         mt->mt_tail = mi;
1927                         /* wait for this op to get to head of list */
1928                         while ( mt->mt_mods != mi ) {
1929                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1930                                 /* FIXME: if dynamic config can delete overlays or
1931                                  * databases we'll have to check for cleanup here.
1932                                  * Currently it's not an issue because there are
1933                                  * no dynamic config deletes...
1934                                  */
1935                                 if ( slapd_shutdown )
1936                                         return SLAPD_ABANDON;
1937
1938                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1939                                         ldap_pvt_thread_yield();
1940                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1941
1942                                 /* clean up if the caller is giving up */
1943                                 if ( op->o_abandon ) {
1944                                         modinst *m2;
1945                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1946                                                 m2 = m2->mi_next );
1947                                         m2->mi_next = mi->mi_next;
1948                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1949                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1950                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1951                                         return SLAPD_ABANDON;
1952                                 }
1953                         }
1954                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1955                 } else {
1956                         /* Record that we're modifying this entry now */
1957                         mt = ch_malloc( sizeof(modtarget) );
1958                         mt->mt_mods = mi;
1959                         mt->mt_tail = mi;
1960                         mt->mt_op = mi->mi_op;
1961                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1962                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1963                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1964                 }
1965         }
1966
1967         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1968                 syncprov_matchops( op, opc, 1 );
1969
1970         return SLAP_CB_CONTINUE;
1971 }
1972
1973 static int
1974 syncprov_op_extended( Operation *op, SlapReply *rs )
1975 {
1976         if ( exop_is_write( op ))
1977                 return syncprov_op_mod( op, rs );
1978
1979         return SLAP_CB_CONTINUE;
1980 }
1981
1982 typedef struct searchstate {
1983         slap_overinst *ss_on;
1984         syncops *ss_so;
1985         BerVarray ss_ctxcsn;
1986         int *ss_sids;
1987         int ss_numcsns;
1988 #define SS_PRESENT      0x01
1989 #define SS_CHANGED      0x02
1990         int ss_flags;
1991 } searchstate;
1992
1993 static int
1994 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1995 {
1996         if ( rs->sr_ctrls ) {
1997                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1998                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1999                 rs->sr_ctrls = NULL;
2000         }
2001         return 0;
2002 }
2003
2004 typedef struct SyncOperationBuffer {
2005         Operation               sob_op;
2006         Opheader                sob_hdr;
2007         OpExtra                 sob_oe;
2008         AttributeName   sob_extra;      /* not always present */
2009         /* Further data allocated here */
2010 } SyncOperationBuffer;
2011
2012 static void
2013 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2014 {
2015         SyncOperationBuffer *sopbuf2;
2016         Operation *op2;
2017         int i, alen = 0;
2018         size_t size;
2019         char *ptr;
2020         GroupAssertion *g1, *g2;
2021
2022         /* count the search attrs */
2023         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2024                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2025         }
2026         /* Make a new copy of the operation */
2027         size = offsetof( SyncOperationBuffer, sob_extra ) +
2028                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2029                 op->o_req_dn.bv_len + 1 +
2030                 op->o_req_ndn.bv_len + 1 +
2031                 op->o_ndn.bv_len + 1 +
2032                 so->s_filterstr.bv_len + 1;
2033         sopbuf2 = ch_calloc( 1, size );
2034         op2 = &sopbuf2->sob_op;
2035         op2->o_hdr = &sopbuf2->sob_hdr;
2036         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2037
2038         /* Copy the fields we care about explicitly, leave the rest alone */
2039         *op2->o_hdr = *op->o_hdr;
2040         op2->o_tag = op->o_tag;
2041         op2->o_time = op->o_time;
2042         op2->o_bd = on->on_info->oi_origdb;
2043         op2->o_request = op->o_request;
2044         op2->o_managedsait = op->o_managedsait;
2045         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2046         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2047
2048         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2049         if ( i ) {
2050                 op2->ors_attrs = (AttributeName *) ptr;
2051                 ptr = (char *) &op2->ors_attrs[i+1];
2052                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2053                         op2->ors_attrs[i] = op->ors_attrs[i];
2054                         op2->ors_attrs[i].an_name.bv_val = ptr;
2055                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2056                 }
2057                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2058         }
2059
2060         op2->o_authz = op->o_authz;
2061         op2->o_ndn.bv_val = ptr;
2062         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2063         op2->o_dn = op2->o_ndn;
2064         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2065         op2->o_req_dn.bv_val = ptr;
2066         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2067         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2068         op2->o_req_ndn.bv_val = ptr;
2069         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2070         op2->ors_filterstr.bv_val = ptr;
2071         strcpy( ptr, so->s_filterstr.bv_val );
2072         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2073
2074         /* Skip the AND/GE clause that we stuck on in front */
2075         if ( so->s_flags & PS_FIX_FILTER ) {
2076                 op2->ors_filter = op->ors_filter->f_and->f_next;
2077                 so->s_flags ^= PS_FIX_FILTER;
2078         } else {
2079                 op2->ors_filter = op->ors_filter;
2080         }
2081         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2082         so->s_op = op2;
2083
2084         /* Copy any cached group ACLs individually */
2085         op2->o_groups = NULL;
2086         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2087                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2088                 *g2 = *g1;
2089                 strcpy( g2->ga_ndn, g1->ga_ndn );
2090                 g2->ga_next = op2->o_groups;
2091                 op2->o_groups = g2;
2092         }
2093         /* Don't allow any further group caching */
2094         op2->o_do_not_cache = 1;
2095
2096         /* Add op2 to conn so abandon will find us */
2097         op->o_conn->c_n_ops_executing++;
2098         op->o_conn->c_n_ops_completed--;
2099         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2100         so->s_flags |= PS_IS_DETACHED;
2101
2102         /* Prevent anyone else from trying to send a result for this op */
2103         op->o_abandon = 1;
2104 }
2105
2106 static int
2107 syncprov_search_response( Operation *op, SlapReply *rs )
2108 {
2109         searchstate *ss = op->o_callback->sc_private;
2110         slap_overinst *on = ss->ss_on;
2111         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2112         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2113
2114         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2115                 Attribute *a;
2116                 /* If we got a referral without a referral object, there's
2117                  * something missing that we cannot replicate. Just ignore it.
2118                  * The consumer will abort because we didn't send the expected
2119                  * control.
2120                  */
2121                 if ( !rs->sr_entry ) {
2122                         assert( rs->sr_entry != NULL );
2123                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2124                         return SLAP_CB_CONTINUE;
2125                 }
2126                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2127                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2128                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2129                 }
2130                 if ( a ) {
2131                         int i, sid;
2132                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2133
2134                         /* Don't send changed entries back to the originator */
2135                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2136                                 Debug( LDAP_DEBUG_SYNC,
2137                                         "Entry %s changed by peer, ignored\n",
2138                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2139                                 return LDAP_SUCCESS;
2140                         }
2141
2142                         /* If not a persistent search */
2143                         if ( !ss->ss_so ) {
2144                                 /* Make sure entry is less than the snapshot'd contextCSN */
2145                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2146                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2147                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2148                                                 Debug( LDAP_DEBUG_SYNC,
2149                                                         "Entry %s CSN %s greater than snapshot %s\n",
2150                                                         rs->sr_entry->e_name.bv_val,
2151                                                         a->a_nvals[0].bv_val,
2152                                                         ss->ss_ctxcsn[i].bv_val );
2153                                                 return LDAP_SUCCESS;
2154                                         }
2155                                 }
2156                         }
2157
2158                         /* Don't send old entries twice */
2159                         if ( srs->sr_state.ctxcsn ) {
2160                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2161                                         if ( sid == srs->sr_state.sids[i] &&
2162                                                 ber_bvcmp( &a->a_nvals[0],
2163                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2164                                                 Debug( LDAP_DEBUG_SYNC,
2165                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2166                                                         rs->sr_entry->e_name.bv_val,
2167                                                         a->a_nvals[0].bv_val,
2168                                                         srs->sr_state.ctxcsn[i].bv_val );
2169                                                 return LDAP_SUCCESS;
2170                                         }
2171                                 }
2172                         }
2173                 }
2174                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2175                         op->o_tmpmemctx );
2176                 rs->sr_ctrls[1] = NULL;
2177                 /* If we're in delta-sync mode, always send a cookie */
2178                 if ( si->si_nopres && si->si_usehint && a ) {
2179                         struct berval cookie;
2180                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2181                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2182                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2183                 } else {
2184                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2185                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2186                 }
2187         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2188                 struct berval cookie;
2189
2190                 if ( ss->ss_flags & SS_CHANGED ) {
2191                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2192                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2193
2194                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2195                 }
2196
2197                 /* Is this a regular refresh?
2198                  * Note: refresh never gets here if there were no changes
2199                  */
2200                 if ( !ss->ss_so ) {
2201                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2202                                 op->o_tmpmemctx );
2203                         rs->sr_ctrls[1] = NULL;
2204                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2205                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2206                                         LDAP_SYNC_REFRESH_DELETES );
2207                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2208                 } else {
2209                 /* It's RefreshAndPersist, transition to Persist phase */
2210                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2211                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2212                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2213                                 1, NULL, 0 );
2214                         if ( ss->ss_flags & SS_CHANGED )
2215                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2216
2217                         /* Detach this Op from frontend control */
2218                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2219
2220                         /* But not if this connection was closed along the way */
2221                         if ( op->o_abandon ) {
2222                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2223                                 /* syncprov_ab_cleanup will free this syncop */
2224                                 return SLAPD_ABANDON;
2225
2226                         } else {
2227                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2228                                 /* Turn off the refreshing flag */
2229                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2230
2231                                 syncprov_detach_op( op, ss->ss_so, on );
2232
2233                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2234
2235                                 /* If there are queued responses, fire them off */
2236                                 if ( ss->ss_so->s_res )
2237                                         syncprov_qstart( ss->ss_so );
2238                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2239                         }
2240
2241                         return LDAP_SUCCESS;
2242                 }
2243         }
2244
2245         return SLAP_CB_CONTINUE;
2246 }
2247
2248 static int
2249 syncprov_op_search( Operation *op, SlapReply *rs )
2250 {
2251         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2252         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2253         slap_callback   *cb;
2254         int gotstate = 0, changed = 0, do_present = 0;
2255         syncops *sop = NULL;
2256         searchstate *ss;
2257         sync_control *srs;
2258         BerVarray ctxcsn;
2259         int i, *sids, numcsns;
2260         struct berval mincsn;
2261
2262         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2263
2264         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2265                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2266                 return rs->sr_err;
2267         }
2268
2269         srs = op->o_controls[slap_cids.sc_LDAPsync];
2270
2271         /* If this is a persistent search, set it up right away */
2272         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2273                 syncops so = {0};
2274                 fbase_cookie fc;
2275                 opcookie opc;
2276                 slap_callback sc;
2277
2278                 fc.fss = &so;
2279                 fc.fbase = 0;
2280                 so.s_eid = NOID;
2281                 so.s_op = op;
2282                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2283                 /* syncprov_findbase expects to be called as a callback... */
2284                 sc.sc_private = &opc;
2285                 opc.son = on;
2286                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2287                 cb = op->o_callback;
2288                 op->o_callback = &sc;
2289                 rs->sr_err = syncprov_findbase( op, &fc );
2290                 op->o_callback = cb;
2291                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2292
2293                 if ( rs->sr_err != LDAP_SUCCESS ) {
2294                         send_ldap_result( op, rs );
2295                         return rs->sr_err;
2296                 }
2297                 sop = ch_malloc( sizeof( syncops ));
2298                 *sop = so;
2299                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2300                 sop->s_rid = srs->sr_state.rid;
2301                 sop->s_sid = srs->sr_state.sid;
2302                 sop->s_inuse = 1;
2303
2304                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2305                 sop->s_next = si->si_ops;
2306                 si->si_ops = sop;
2307                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2308         }
2309
2310         /* snapshot the ctxcsn */
2311         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2312         numcsns = si->si_numcsns;
2313         if ( numcsns ) {
2314                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2315                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2316                 for ( i=0; i<numcsns; i++ )
2317                         sids[i] = si->si_sids[i];
2318         } else {
2319                 ctxcsn = NULL;
2320                 sids = NULL;
2321         }
2322         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2323
2324         /* If we have a cookie, handle the PRESENT lookups */
2325         if ( srs->sr_state.ctxcsn ) {
2326                 sessionlog *sl;
2327                 int i, j;
2328
2329                 /* If we don't have any CSN of our own yet, pretend nothing
2330                  * has changed.
2331                  */
2332                 if ( !numcsns )
2333                         goto no_change;
2334
2335                 if ( !si->si_nopres )
2336                         do_present = SS_PRESENT;
2337
2338                 /* If there are SIDs we don't recognize in the cookie, drop them */
2339                 for (i=0; i<srs->sr_state.numcsns; ) {
2340                         for (j=0; j<numcsns; j++) {
2341                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2342                                         break;
2343                                 }
2344                         }
2345                         /* not found */
2346                         if ( j == numcsns ) {
2347                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2348                                 j = srs->sr_state.numcsns - 1;
2349                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2350                                 tmp.bv_len = 0;
2351                                 srs->sr_state.ctxcsn[j] = tmp;
2352                                 srs->sr_state.numcsns = j;
2353                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2354                                 continue;
2355                         }
2356                         i++;
2357                 }
2358
2359                 /* Find the smallest CSN */
2360                 mincsn = srs->sr_state.ctxcsn[0];
2361                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2362                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2363                                 mincsn = srs->sr_state.ctxcsn[i];
2364                 }
2365
2366                 /* If nothing has changed, shortcut it */
2367                 if ( srs->sr_state.numcsns == numcsns ) {
2368                         int i, j;
2369                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2370                                 for ( j=0; j<numcsns; j++ ) {
2371                                         if ( srs->sr_state.sids[i] != sids[j] )
2372                                                 continue;
2373                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2374                                                 changed = SS_CHANGED;
2375                                         break;
2376                                 }
2377                                 if ( changed )
2378                                         break;
2379                         }
2380                         if ( !changed ) {
2381                                 do_present = 0;
2382 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2383                                         LDAPControl     *ctrls[2];
2384
2385                                         ctrls[0] = NULL;
2386                                         ctrls[1] = NULL;
2387                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2388                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2389                                         rs->sr_ctrls = ctrls;
2390                                         rs->sr_err = LDAP_SUCCESS;
2391                                         send_ldap_result( op, rs );
2392                                         rs->sr_ctrls = NULL;
2393                                         return rs->sr_err;
2394                                 }
2395                                 goto shortcut;
2396                         }
2397                 } else {
2398                         /* consumer doesn't have the right number of CSNs */
2399                         changed = SS_CHANGED;
2400                 }
2401                 /* Do we have a sessionlog for this search? */
2402                 sl=si->si_logs;
2403                 if ( sl ) {
2404                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2405                         /* Are there any log entries, and is the consumer state
2406                          * present in the session log?
2407                          */
2408                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2409                                 do_present = 0;
2410                                 /* mutex is unlocked in playlog */
2411                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2412                         } else {
2413                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2414                         }
2415                 }
2416                 /* Is the CSN still present in the database? */
2417                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2418                         /* No, so a reload is required */
2419                         /* the 2.2 consumer doesn't send this hint */
2420                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2421                                 if ( ctxcsn )
2422                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2423                                 if ( sids )
2424                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2425                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2426                                 return rs->sr_err;
2427                         }
2428                         if ( srs->sr_state.ctxcsn ) {
2429                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2430                                 srs->sr_state.ctxcsn = NULL;
2431                         }
2432                         if ( srs->sr_state.sids ) {
2433                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2434                                 srs->sr_state.sids = NULL;
2435                         }
2436                         srs->sr_state.numcsns = 0;
2437                 } else {
2438                         gotstate = 1;
2439                         /* If changed and doing Present lookup, send Present UUIDs */
2440                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2441                                 LDAP_SUCCESS ) {
2442                                 if ( ctxcsn )
2443                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2444                                 if ( sids )
2445                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2446                                 send_ldap_result( op, rs );
2447                                 return rs->sr_err;
2448                         }
2449                 }
2450         } else {
2451                 /* No consumer state, assume something has changed */
2452                 changed = SS_CHANGED;
2453         }
2454
2455 shortcut:
2456         /* Append CSN range to search filter, save original filter
2457          * for persistent search evaluation
2458          */
2459         if ( sop ) {
2460                 sop->s_filterstr= op->ors_filterstr;
2461         }
2462
2463         /* If something changed, find the changes */
2464         if ( gotstate && changed ) {
2465                 Filter *fand, *fava;
2466
2467                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2468                 fand->f_choice = LDAP_FILTER_AND;
2469                 fand->f_next = NULL;
2470                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2471                 fand->f_and = fava;
2472                 fava->f_choice = LDAP_FILTER_GE;
2473                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2474                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2475 #ifdef LDAP_COMP_MATCH
2476                 fava->f_ava->aa_cf = NULL;
2477 #endif
2478                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2479                 fava->f_next = op->ors_filter;
2480                 op->ors_filter = fand;
2481                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2482                 if ( sop )
2483                         sop->s_flags |= PS_FIX_FILTER;
2484         }
2485
2486         /* Let our callback add needed info to returned entries */
2487         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2488         ss = (searchstate *)(cb+1);
2489         ss->ss_on = on;
2490         ss->ss_so = sop;
2491         ss->ss_flags = do_present | changed;
2492         ss->ss_ctxcsn = ctxcsn;
2493         ss->ss_numcsns = numcsns;
2494         ss->ss_sids = sids;
2495         cb->sc_response = syncprov_search_response;
2496         cb->sc_cleanup = syncprov_search_cleanup;
2497         cb->sc_private = ss;
2498         cb->sc_next = op->o_callback;
2499         op->o_callback = cb;
2500
2501         /* If this is a persistent search and no changes were reported during
2502          * the refresh phase, just invoke the response callback to transition
2503          * us into persist phase
2504          */
2505         if ( !changed ) {
2506                 rs->sr_err = LDAP_SUCCESS;
2507                 rs->sr_nentries = 0;
2508                 send_ldap_result( op, rs );
2509                 return rs->sr_err;
2510         }
2511         return SLAP_CB_CONTINUE;
2512 }
2513
2514 static int
2515 syncprov_operational(
2516         Operation *op,
2517         SlapReply *rs )
2518 {
2519         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2520         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2521
2522         /* This prevents generating unnecessarily; frontend will strip
2523          * any statically stored copy.
2524          */
2525         if ( op->o_sync != SLAP_CONTROL_NONE )
2526                 return SLAP_CB_CONTINUE;
2527
2528         if ( rs->sr_entry &&
2529                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2530
2531                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2532                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2533                         Attribute *a, **ap = NULL;
2534
2535                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2536                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2537                                         break;
2538                         }
2539
2540                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2541                         if ( si->si_ctxcsn ) {
2542                                 if ( !a ) {
2543                                         for ( ap = &rs->sr_operational_attrs; *ap;
2544                                                 ap=&(*ap)->a_next );
2545
2546                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2547                                         *ap = a;
2548                                 }
2549
2550                                 if ( !ap ) {
2551                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2552                                                 Entry *e = entry_dup( rs->sr_entry );
2553                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2554                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2555                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2556                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2557                                                         entry_free( rs->sr_entry );
2558                                                 }
2559                                                 rs->sr_entry = e;
2560                                                 rs->sr_flags |=
2561                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2562                                                 a = attr_find( rs->sr_entry->e_attrs,
2563                                                         slap_schema.si_ad_contextCSN );
2564                                         }
2565                                         if ( a->a_nvals != a->a_vals ) {
2566                                                 ber_bvarray_free( a->a_nvals );
2567                                         }
2568                                         a->a_nvals = NULL;
2569                                         ber_bvarray_free( a->a_vals );
2570                                         a->a_vals = NULL;
2571                                         a->a_numvals = 0;
2572                                 }
2573                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2574                         }
2575                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2576                 }
2577         }
2578         return SLAP_CB_CONTINUE;
2579 }
2580
2581 enum {
2582         SP_CHKPT = 1,
2583         SP_SESSL,
2584         SP_NOPRES,
2585         SP_USEHINT
2586 };
2587
2588 static ConfigDriver sp_cf_gen;
2589
2590 static ConfigTable spcfg[] = {
2591         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2592                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2593                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2594                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2595         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2596                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2597                         "DESC 'Session log size in ops' "
2598                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2599         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2600                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2601                         "DESC 'Omit Present phase processing' "
2602                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2603         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2604                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2605                         "DESC 'Observe Reload Hint in Request control' "
2606                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2607         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2608 };
2609
2610 static ConfigOCs spocs[] = {
2611         { "( OLcfgOvOc:1.1 "
2612                 "NAME 'olcSyncProvConfig' "
2613                 "DESC 'SyncRepl Provider configuration' "
2614                 "SUP olcOverlayConfig "
2615                 "MAY ( olcSpCheckpoint "
2616                         "$ olcSpSessionlog "
2617                         "$ olcSpNoPresent "
2618                         "$ olcSpReloadHint "
2619                 ") )",
2620                         Cft_Overlay, spcfg },
2621         { NULL, 0, NULL }
2622 };
2623
2624 static int
2625 sp_cf_gen(ConfigArgs *c)
2626 {
2627         slap_overinst           *on = (slap_overinst *)c->bi;
2628         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2629         int rc = 0;
2630
2631         if ( c->op == SLAP_CONFIG_EMIT ) {
2632                 switch ( c->type ) {
2633                 case SP_CHKPT:
2634                         if ( si->si_chkops || si->si_chktime ) {
2635                                 struct berval bv;
2636                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2637                                         "%d %d", si->si_chkops, si->si_chktime );
2638                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2639                                         rc = 1;
2640                                 } else {
2641                                         bv.bv_val = c->cr_msg;
2642                                         value_add_one( &c->rvalue_vals, &bv );
2643                                 }
2644                         } else {
2645                                 rc = 1;
2646                         }
2647                         break;
2648                 case SP_SESSL:
2649                         if ( si->si_logs ) {
2650                                 c->value_int = si->si_logs->sl_size;
2651                         } else {
2652                                 rc = 1;
2653                         }
2654                         break;
2655                 case SP_NOPRES:
2656                         if ( si->si_nopres ) {
2657                                 c->value_int = 1;
2658                         } else {
2659                                 rc = 1;
2660                         }
2661                         break;
2662                 case SP_USEHINT:
2663                         if ( si->si_usehint ) {
2664                                 c->value_int = 1;
2665                         } else {
2666                                 rc = 1;
2667                         }
2668                         break;
2669                 }
2670                 return rc;
2671         } else if ( c->op == LDAP_MOD_DELETE ) {
2672                 switch ( c->type ) {
2673                 case SP_CHKPT:
2674                         si->si_chkops = 0;
2675                         si->si_chktime = 0;
2676                         break;
2677                 case SP_SESSL:
2678                         if ( si->si_logs )
2679                                 si->si_logs->sl_size = 0;
2680                         else
2681                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2682                         break;
2683                 case SP_NOPRES:
2684                         if ( si->si_nopres )
2685                                 si->si_nopres = 0;
2686                         else
2687                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2688                         break;
2689                 case SP_USEHINT:
2690                         if ( si->si_usehint )
2691                                 si->si_usehint = 0;
2692                         else
2693                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2694                         break;
2695                 }
2696                 return rc;
2697         }
2698         switch ( c->type ) {
2699         case SP_CHKPT:
2700                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2701                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2702                                 c->argv[0], c->argv[1] );
2703                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2704                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2705                         return ARG_BAD_CONF;
2706                 }
2707                 if ( si->si_chkops <= 0 ) {
2708                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2709                                 c->argv[0], si->si_chkops );
2710                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2711                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2712                         return ARG_BAD_CONF;
2713                 }
2714                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2715                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2716                                 c->argv[0], c->argv[1] );
2717                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2718                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2719                         return ARG_BAD_CONF;
2720                 }
2721                 if ( si->si_chktime <= 0 ) {
2722                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2723                                 c->argv[0], si->si_chkops );
2724                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2725                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2726                         return ARG_BAD_CONF;
2727                 }
2728                 si->si_chktime *= 60;
2729                 break;
2730         case SP_SESSL: {
2731                 sessionlog *sl;
2732                 int size = c->value_int;
2733
2734                 if ( size < 0 ) {
2735                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2736                                 c->argv[0], size );
2737                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2738                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2739                         return ARG_BAD_CONF;
2740                 }
2741                 sl = si->si_logs;
2742                 if ( !sl ) {
2743                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2744                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2745                         sl->sl_mincsn.bv_len = 0;
2746                         sl->sl_num = 0;
2747                         sl->sl_head = sl->sl_tail = NULL;
2748                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2749                         si->si_logs = sl;
2750                 }
2751                 sl->sl_size = size;
2752                 }
2753                 break;
2754         case SP_NOPRES:
2755                 si->si_nopres = c->value_int;
2756                 break;
2757         case SP_USEHINT:
2758                 si->si_usehint = c->value_int;
2759                 break;
2760         }
2761         return rc;
2762 }
2763
2764 /* ITS#3456 we cannot run this search on the main thread, must use a
2765  * child thread in order to insure we have a big enough stack.
2766  */
2767 static void *
2768 syncprov_db_otask(
2769         void *ptr
2770 )
2771 {
2772         syncprov_findcsn( ptr, FIND_MAXCSN );
2773         return NULL;
2774 }
2775
2776 /* Read any existing contextCSN from the underlying db.
2777  * Then search for any entries newer than that. If no value exists,
2778  * just generate it. Cache whatever result.
2779  */
2780 static int
2781 syncprov_db_open(
2782         BackendDB *be,
2783         ConfigReply *cr
2784 )
2785 {
2786         slap_overinst   *on = (slap_overinst *) be->bd_info;
2787         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2788
2789         Connection conn = { 0 };
2790         OperationBuffer opbuf;
2791         Operation *op;
2792         Entry *e = NULL;
2793         Attribute *a;
2794         int rc;
2795         void *thrctx = NULL;
2796
2797         if ( !SLAP_LASTMOD( be )) {
2798                 Debug( LDAP_DEBUG_ANY,
2799                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2800                 return -1;
2801         }
2802
2803         if ( slapMode & SLAP_TOOL_MODE ) {
2804                 return 0;
2805         }
2806
2807         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2808         if ( rc ) {
2809                 return rc;
2810         }
2811
2812         thrctx = ldap_pvt_thread_pool_context();
2813         connection_fake_init( &conn, &opbuf, thrctx );
2814         op = &opbuf.ob_op;
2815         op->o_bd = be;
2816         op->o_dn = be->be_rootdn;
2817         op->o_ndn = be->be_rootndn;
2818
2819         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2820                 slap_schema.si_ad_contextCSN, 0, &e, on );
2821
2822         if ( e ) {
2823                 ldap_pvt_thread_t tid;
2824
2825                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2826                 if ( a ) {
2827                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2828                         si->si_numcsns = a->a_numvals;
2829                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2830                 }
2831                 overlay_entry_release_ov( op, e, 0, on );
2832                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2833                         op->o_req_dn = be->be_suffix[0];
2834                         op->o_req_ndn = be->be_nsuffix[0];
2835                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2836                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2837                         ldap_pvt_thread_join( tid, NULL );
2838                 }
2839         }
2840
2841         /* Didn't find a contextCSN, should we generate one? */
2842         if ( !si->si_ctxcsn ) {
2843                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2844                 struct berval csn;
2845
2846                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2847                 /* If we're also a consumer, then don't generate anything.
2848                  * Wait for our provider to send it to us, or for a local
2849                  * modify if we have multimaster.
2850                  */
2851                         goto out;
2852                 }
2853                 csn.bv_val = csnbuf;
2854                 csn.bv_len = sizeof( csnbuf );
2855                 slap_get_csn( op, &csn, 0 );
2856                 value_add_one( &si->si_ctxcsn, &csn );
2857                 si->si_numcsns = 1;
2858                 si->si_sids = ch_malloc( sizeof(int) );
2859                 si->si_sids[0] = slap_serverID;
2860
2861                 /* make sure we do a checkpoint on close */
2862                 si->si_numops++;
2863         }
2864
2865 out:
2866         op->o_bd->bd_info = (BackendInfo *)on;
2867         return 0;
2868 }
2869
2870 /* Write the current contextCSN into the underlying db.
2871  */
2872 static int
2873 syncprov_db_close(
2874         BackendDB *be,
2875         ConfigReply *cr
2876 )
2877 {
2878     slap_overinst   *on = (slap_overinst *) be->bd_info;
2879     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2880
2881         if ( slapMode & SLAP_TOOL_MODE ) {
2882                 return 0;
2883         }
2884         if ( si->si_numops ) {
2885                 Connection conn = {0};
2886                 OperationBuffer opbuf;
2887                 Operation *op;
2888                 SlapReply rs = {REP_RESULT};
2889                 void *thrctx;
2890
2891                 thrctx = ldap_pvt_thread_pool_context();
2892                 connection_fake_init( &conn, &opbuf, thrctx );
2893                 op = &opbuf.ob_op;
2894                 op->o_bd = be;
2895                 op->o_dn = be->be_rootdn;
2896                 op->o_ndn = be->be_rootndn;
2897                 syncprov_checkpoint( op, &rs, on );
2898         }
2899
2900     return 0;
2901 }
2902
2903 static int
2904 syncprov_db_init(
2905         BackendDB *be,
2906         ConfigReply *cr
2907 )
2908 {
2909         slap_overinst   *on = (slap_overinst *)be->bd_info;
2910         syncprov_info_t *si;
2911
2912         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2913                 Debug( LDAP_DEBUG_ANY,
2914                         "syncprov must be instantiated within a database.\n",
2915                         0, 0, 0 );
2916                 return 1;
2917         }
2918
2919         si = ch_calloc(1, sizeof(syncprov_info_t));
2920         on->on_bi.bi_private = si;
2921         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2922         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2923         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2924
2925         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2926         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2927         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2928         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2929
2930         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2931         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2932
2933         return 0;
2934 }
2935
2936 static int
2937 syncprov_db_destroy(
2938         BackendDB *be,
2939         ConfigReply *cr
2940 )
2941 {
2942         slap_overinst   *on = (slap_overinst *)be->bd_info;
2943         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2944
2945         if ( si ) {
2946                 if ( si->si_logs ) {
2947                         slog_entry *se = si->si_logs->sl_head;
2948
2949                         while ( se ) {
2950                                 slog_entry *se_next = se->se_next;
2951                                 ch_free( se );
2952                                 se = se_next;
2953                         }
2954
2955                         ch_free( si->si_logs );
2956                 }
2957                 if ( si->si_ctxcsn )
2958                         ber_bvarray_free( si->si_ctxcsn );
2959                 if ( si->si_sids )
2960                         ch_free( si->si_sids );
2961                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2962                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2963                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2964                 ch_free( si );
2965         }
2966
2967         return 0;
2968 }
2969
2970 static int syncprov_parseCtrl (
2971         Operation *op,
2972         SlapReply *rs,
2973         LDAPControl *ctrl )
2974 {
2975         ber_tag_t tag;
2976         BerElementBuffer berbuf;
2977         BerElement *ber = (BerElement *)&berbuf;
2978         ber_int_t mode;
2979         ber_len_t len;
2980         struct berval cookie = BER_BVNULL;
2981         sync_control *sr;
2982         int rhint = 0;
2983
2984         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2985                 rs->sr_text = "Sync control specified multiple times";
2986                 return LDAP_PROTOCOL_ERROR;
2987         }
2988
2989         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2990                 rs->sr_text = "Sync control specified with pagedResults control";
2991                 return LDAP_PROTOCOL_ERROR;
2992         }
2993
2994         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2995                 rs->sr_text = "Sync control value is absent";
2996                 return LDAP_PROTOCOL_ERROR;
2997         }
2998
2999         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3000                 rs->sr_text = "Sync control value is empty";
3001                 return LDAP_PROTOCOL_ERROR;
3002         }
3003
3004         /* Parse the control value
3005          *      syncRequestValue ::= SEQUENCE {
3006          *              mode   ENUMERATED {
3007          *                      -- 0 unused
3008          *                      refreshOnly             (1),
3009          *                      -- 2 reserved
3010          *                      refreshAndPersist       (3)
3011          *              },
3012          *              cookie  syncCookie OPTIONAL
3013          *      }
3014          */
3015
3016         ber_init2( ber, &ctrl->ldctl_value, 0 );
3017
3018         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3019                 rs->sr_text = "Sync control : mode decoding error";
3020                 return LDAP_PROTOCOL_ERROR;
3021         }
3022
3023         switch( mode ) {
3024         case LDAP_SYNC_REFRESH_ONLY:
3025                 mode = SLAP_SYNC_REFRESH;
3026                 break;
3027         case LDAP_SYNC_REFRESH_AND_PERSIST:
3028                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3029                 break;
3030         default:
3031                 rs->sr_text = "Sync control : unknown update mode";
3032                 return LDAP_PROTOCOL_ERROR;
3033         }
3034
3035         tag = ber_peek_tag( ber, &len );
3036
3037         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3038                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3039                         rs->sr_text = "Sync control : cookie decoding error";
3040                         return LDAP_PROTOCOL_ERROR;
3041                 }
3042                 tag = ber_peek_tag( ber, &len );
3043         }
3044         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3045                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3046                         rs->sr_text = "Sync control : rhint decoding error";
3047                         return LDAP_PROTOCOL_ERROR;
3048                 }
3049         }
3050         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3051                         rs->sr_text = "Sync control : decoding error";
3052                         return LDAP_PROTOCOL_ERROR;
3053         }
3054         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3055         sr->sr_rhint = rhint;
3056         if (!BER_BVISNULL(&cookie)) {
3057                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3058                 /* If parse fails, pretend no cookie was sent */
3059                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3060                         sr->sr_state.rid == -1 ) {
3061                         if ( sr->sr_state.ctxcsn ) {
3062                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3063                                 sr->sr_state.ctxcsn = NULL;
3064                         }
3065                         sr->sr_state.numcsns = 0;
3066                 }
3067         }
3068
3069         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3070
3071         op->o_sync = ctrl->ldctl_iscritical
3072                 ? SLAP_CONTROL_CRITICAL
3073                 : SLAP_CONTROL_NONCRITICAL;
3074
3075         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3076
3077         return LDAP_SUCCESS;
3078 }
3079
3080 /* This overlay is set up for dynamic loading via moduleload. For static
3081  * configuration, you'll need to arrange for the slap_overinst to be
3082  * initialized and registered by some other function inside slapd.
3083  */
3084
3085 static slap_overinst            syncprov;
3086
3087 int
3088 syncprov_initialize()
3089 {
3090         int rc;
3091
3092         rc = register_supported_control( LDAP_CONTROL_SYNC,
3093                 SLAP_CTRL_SEARCH, NULL,
3094                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3095         if ( rc != LDAP_SUCCESS ) {
3096                 Debug( LDAP_DEBUG_ANY,
3097                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3098                 return rc;
3099         }
3100
3101         syncprov.on_bi.bi_type = "syncprov";
3102         syncprov.on_bi.bi_db_init = syncprov_db_init;
3103         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3104         syncprov.on_bi.bi_db_open = syncprov_db_open;
3105         syncprov.on_bi.bi_db_close = syncprov_db_close;
3106
3107         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3108         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3109
3110         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3111         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3112         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3113         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3114         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3115         syncprov.on_bi.bi_op_search = syncprov_op_search;
3116         syncprov.on_bi.bi_extended = syncprov_op_extended;
3117         syncprov.on_bi.bi_operational = syncprov_operational;
3118
3119         syncprov.on_bi.bi_cf_ocs = spocs;
3120
3121         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3122
3123         rc = config_register_schema( spcfg, spocs );
3124         if ( rc ) return rc;
3125
3126         return overlay_register( &syncprov );
3127 }
3128
3129 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3130 int
3131 init_module( int argc, char *argv[] )
3132 {
3133         return syncprov_initialize();
3134 }
3135 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3136
3137 #endif /* defined(SLAPD_OVER_SYNCPROV) */