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 2004-2010 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         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  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         struct berval   si_contextdn;
 129         int             *si_sids;
 130         int             si_numcsns;
 131         int             si_chkops;      /* checkpointing info */
 132         int             si_chktime;
 133         int             si_numops;      /* number of ops since last checkpoint */
 134         int             si_nopres;      /* Skip present phase */
 135         int             si_usehint;     /* use reload hint */
 136         time_t  si_chklast;     /* time of last checkpoint */
 137         Avlnode *si_mods;       /* entries being modified */
 138         sessionlog      *si_logs;
 139         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 140         ldap_pvt_thread_mutex_t si_ops_mutex;
 141         ldap_pvt_thread_mutex_t si_mods_mutex;
 142         ldap_pvt_thread_mutex_t si_resp_mutex;
 143 } syncprov_info_t;
 144
 145 typedef struct opcookie {
 146         slap_overinst *son;
 147         syncmatches *smatches;
 148         modtarget *smt;
 149         Entry *se;
 150         struct berval sdn;      /* DN of entry, for deletes */
 151         struct berval sndn;
 152         struct berval suuid;    /* UUID of entry */
 153         struct berval sctxcsn;
 154         short osid;     /* sid of op csn */
 155         short rsid;     /* sid of relay */
 156         short sreference;       /* Is the entry a reference? */
 157 } opcookie;
 158
 159 typedef struct mutexint {
 160         ldap_pvt_thread_mutex_t mi_mutex;
 161         int mi_int;
 162 } mutexint;
 163
 164 typedef struct fbase_cookie {
 165         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 166         syncops *fss;   /* persistent search we're testing against */
 167         int fbase;      /* if TRUE we found the search base and it's still valid */
 168         int fscope;     /* if TRUE then fdn is within the psearch scope */
 169 } fbase_cookie;
 170
 171 static AttributeName csn_anlist[3];
 172 static AttributeName uuid_anlist[2];
 173
 174 /* Build a LDAPsync intermediate state control */
 175 static int
 176 syncprov_state_ctrl(
 177         Operation       *op,
 178         SlapReply       *rs,
 179         Entry           *e,
 180         int             entry_sync_state,
 181         LDAPControl     **ctrls,
 182         int             num_ctrls,
 183         int             send_cookie,
 184         struct berval   *cookie )
 185 {
 186         Attribute* a;
 187         int ret;
 188
 189         BerElementBuffer berbuf;
 190         BerElement *ber = (BerElement *)&berbuf;
 191
 192         struct berval   entryuuid_bv = BER_BVNULL;
 193
 194         ber_init2( ber, 0, LBER_USE_DER );
 195         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 196
 197         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 198
 199         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 200                 AttributeDescription *desc = a->a_desc;
 201                 if ( desc == slap_schema.si_ad_entryUUID ) {
 202                         entryuuid_bv = a->a_nvals[0];
 203                         break;
 204                 }
 205         }
 206
 207         /* FIXME: what if entryuuid is NULL or empty ? */
 208
 209         if ( send_cookie && cookie ) {
 210                 ber_printf( ber, "{eOON}",
 211                         entry_sync_state, &entryuuid_bv, cookie );
 212         } else {
 213                 ber_printf( ber, "{eON}",
 214                         entry_sync_state, &entryuuid_bv );
 215         }
 216
 217         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 218         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 219         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 220
 221         ber_free_buf( ber );
 222
 223         if ( ret < 0 ) {
 224                 Debug( LDAP_DEBUG_TRACE,
 225                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 226                         0, 0, 0 );
 227                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 228                 return ret;
 229         }
 230
 231         return LDAP_SUCCESS;
 232 }
 233
 234 /* Build a LDAPsync final state control */
 235 static int
 236 syncprov_done_ctrl(
 237         Operation       *op,
 238         SlapReply       *rs,
 239         LDAPControl     **ctrls,
 240         int                     num_ctrls,
 241         int                     send_cookie,
 242         struct berval *cookie,
 243         int                     refreshDeletes )
 244 {
 245         int ret;
 246         BerElementBuffer berbuf;
 247         BerElement *ber = (BerElement *)&berbuf;
 248
 249         ber_init2( ber, NULL, LBER_USE_DER );
 250         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 251
 252         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 253
 254         ber_printf( ber, "{" );
 255         if ( send_cookie && cookie ) {
 256                 ber_printf( ber, "O", cookie );
 257         }
 258         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 259                 ber_printf( ber, "b", refreshDeletes );
 260         }
 261         ber_printf( ber, "N}" );
 262
 263         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 264         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 265         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 266
 267         ber_free_buf( ber );
 268
 269         if ( ret < 0 ) {
 270                 Debug( LDAP_DEBUG_TRACE,
 271                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 272                         0, 0, 0 );
 273                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 274                 return ret;
 275         }
 276
 277         return LDAP_SUCCESS;
 278 }
 279
 280 static int
 281 syncprov_sendinfo(
 282         Operation       *op,
 283         SlapReply       *rs,
 284         int                     type,
 285         struct berval *cookie,
 286         int                     refreshDone,
 287         BerVarray       syncUUIDs,
 288         int                     refreshDeletes )
 289 {
 290         BerElementBuffer berbuf;
 291         BerElement *ber = (BerElement *)&berbuf;
 292         struct berval rspdata;
 293
 294         int ret;
 295
 296         ber_init2( ber, NULL, LBER_USE_DER );
 297         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 298
 299         if ( type ) {
 300                 switch ( type ) {
 301                 case LDAP_TAG_SYNC_NEW_COOKIE:
 302                         ber_printf( ber, "tO", type, cookie );
 303                         break;
 304                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 305                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 306                         ber_printf( ber, "t{", type );
 307                         if ( cookie ) {
 308                                 ber_printf( ber, "O", cookie );
 309                         }
 310                         if ( refreshDone == 0 ) {
 311                                 ber_printf( ber, "b", refreshDone );
 312                         }
 313                         ber_printf( ber, "N}" );
 314                         break;
 315                 case LDAP_TAG_SYNC_ID_SET:
 316                         ber_printf( ber, "t{", type );
 317                         if ( cookie ) {
 318                                 ber_printf( ber, "O", cookie );
 319                         }
 320                         if ( refreshDeletes == 1 ) {
 321                                 ber_printf( ber, "b", refreshDeletes );
 322                         }
 323                         ber_printf( ber, "[W]", syncUUIDs );
 324                         ber_printf( ber, "N}" );
 325                         break;
 326                 default:
 327                         Debug( LDAP_DEBUG_TRACE,
 328                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 329                                 type, 0, 0 );
 330                         return LDAP_OTHER;
 331                 }
 332         }
 333
 334         ret = ber_flatten2( ber, &rspdata, 0 );
 335
 336         if ( ret < 0 ) {
 337                 Debug( LDAP_DEBUG_TRACE,
 338                         "syncprov_sendinfo: ber_flatten2 failed\n",
 339                         0, 0, 0 );
 340                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 341                 return ret;
 342         }
 343
 344         rs->sr_rspoid = LDAP_SYNC_INFO;
 345         rs->sr_rspdata = &rspdata;
 346         send_ldap_intermediate( op, rs );
 347         rs->sr_rspdata = NULL;
 348         ber_free_buf( ber );
 349
 350         return LDAP_SUCCESS;
 351 }
 352
 353 /* Find a modtarget in an AVL tree */
 354 static int
 355 sp_avl_cmp( const void *c1, const void *c2 )
 356 {
 357         const modtarget *m1, *m2;
 358         int rc;
 359
 360         m1 = c1; m2 = c2;
 361         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 362
 363         if ( rc ) return rc;
 364         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 365 }
 366
 367 /* syncprov_findbase:
 368  *   finds the true DN of the base of a search (with alias dereferencing) and
 369  * checks to make sure the base entry doesn't get replaced with a different
 370  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 371  * change is detected, any persistent search on this base must be terminated /
 372  * reloaded.
 373  *   On the first call, we just save the DN and entryID. On subsequent calls
 374  * we compare the DN and entryID with the saved values.
 375  */
 376 static int
 377 findbase_cb( Operation *op, SlapReply *rs )
 378 {
 379         slap_callback *sc = op->o_callback;
 380
 381         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 382                 fbase_cookie *fc = sc->sc_private;
 383
 384                 /* If no entryID, we're looking for the first time.
 385                  * Just store whatever we got.
 386                  */
 387                 if ( fc->fss->s_eid == NOID ) {
 388                         fc->fbase = 2;
 389                         fc->fss->s_eid = rs->sr_entry->e_id;
 390                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 391
 392                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 393                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 394
 395                 /* OK, the DN is the same and the entryID is the same. */
 396                         fc->fbase = 1;
 397                 }
 398         }
 399         if ( rs->sr_err != LDAP_SUCCESS ) {
 400                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 401         }
 402         return LDAP_SUCCESS;
 403 }
 404
 405 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 406 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 407
 408 static int
 409 syncprov_findbase( Operation *op, fbase_cookie *fc )
 410 {
 411         /* Use basic parameters from syncrepl search, but use
 412          * current op's threadctx / tmpmemctx
 413          */
 414         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 415         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 416                 slap_callback cb = {0};
 417                 Operation fop;
 418                 SlapReply frs = { REP_RESULT };
 419                 int rc;
 420
 421                 fc->fss->s_flags ^= PS_FIND_BASE;
 422                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 423
 424                 fop = *fc->fss->s_op;
 425
 426                 fop.o_bd = fop.o_bd->bd_self;
 427                 fop.o_hdr = op->o_hdr;
 428                 fop.o_time = op->o_time;
 429                 fop.o_tincr = op->o_tincr;
 430
 431                 cb.sc_response = findbase_cb;
 432                 cb.sc_private = fc;
 433
 434                 fop.o_sync_mode = 0;    /* turn off sync mode */
 435                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 436                 fop.o_callback = &cb;
 437                 fop.o_tag = LDAP_REQ_SEARCH;
 438                 fop.ors_scope = LDAP_SCOPE_BASE;
 439                 fop.ors_limit = NULL;
 440                 fop.ors_slimit = 1;
 441                 fop.ors_tlimit = SLAP_NO_LIMIT;
 442                 fop.ors_attrs = slap_anlist_no_attrs;
 443                 fop.ors_attrsonly = 1;
 444                 fop.ors_filter = &generic_filter;
 445                 fop.ors_filterstr = generic_filterstr;
 446
 447                 rc = fop.o_bd->be_search( &fop, &frs );
 448         } else {
 449                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 450                 fc->fbase = 1;
 451         }
 452
 453         /* After the first call, see if the fdn resides in the scope */
 454         if ( fc->fbase == 1 ) {
 455                 switch ( fc->fss->s_op->ors_scope ) {
 456                 case LDAP_SCOPE_BASE:
 457                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 458                         break;
 459                 case LDAP_SCOPE_ONELEVEL: {
 460                         struct berval pdn;
 461                         dnParent( fc->fdn, &pdn );
 462                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 463                         break; }
 464                 case LDAP_SCOPE_SUBTREE:
 465                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 466                         break;
 467                 case LDAP_SCOPE_SUBORDINATE:
 468                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 469                                 !dn_match( fc->fdn, &fc->fss->s_base );
 470                         break;
 471                 }
 472         }
 473
 474         if ( fc->fbase )
 475                 return LDAP_SUCCESS;
 476
 477         /* If entryID has changed, then the base of this search has
 478          * changed. Invalidate the psearch.
 479          */
 480         return LDAP_NO_SUCH_OBJECT;
 481 }
 482
 483 /* syncprov_findcsn:
 484  *   This function has three different purposes, but they all use a search
 485  * that filters on entryCSN so they're combined here.
 486  * 1: at startup time, after a contextCSN has been read from the database,
 487  * we search for all entries with CSN >= contextCSN in case the contextCSN
 488  * was not checkpointed at the previous shutdown.
 489  *
 490  * 2: when the current contextCSN is known and we have a sync cookie, we search
 491  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 492  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 493  *
 494  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 495  * CSN, and generate Present records for them. We always collect this result
 496  * in SyncID sets, even if there's only one match.
 497  */
 498 typedef enum find_csn_t {
 499         FIND_MAXCSN     = 1,
 500         FIND_CSN        = 2,
 501         FIND_PRESENT    = 3
 502 } find_csn_t;
 503
 504 static int
 505 findmax_cb( Operation *op, SlapReply *rs )
 506 {
 507         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 508                 struct berval *maxcsn = op->o_callback->sc_private;
 509                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 510                         slap_schema.si_ad_entryCSN );
 511
 512                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 513                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 514                         maxcsn->bv_len = a->a_vals[0].bv_len;
 515                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 516                 }
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 static int
 522 findcsn_cb( Operation *op, SlapReply *rs )
 523 {
 524         slap_callback *sc = op->o_callback;
 525
 526         /* We just want to know that at least one exists, so it's OK if
 527          * we exceed the unchecked limit.
 528          */
 529         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 530                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 531                 sc->sc_private = (void *)1;
 532         }
 533         return LDAP_SUCCESS;
 534 }
 535
 536 /* Build a list of entryUUIDs for sending in a SyncID set */
 537
 538 #define UUID_LEN        16
 539
 540 typedef struct fpres_cookie {
 541         int num;
 542         BerVarray uuids;
 543         char *last;
 544 } fpres_cookie;
 545
 546 static int
 547 findpres_cb( Operation *op, SlapReply *rs )
 548 {
 549         slap_callback *sc = op->o_callback;
 550         fpres_cookie *pc = sc->sc_private;
 551         Attribute *a;
 552         int ret = SLAP_CB_CONTINUE;
 553
 554         switch ( rs->sr_type ) {
 555         case REP_SEARCH:
 556                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 557                 if ( a ) {
 558                         pc->uuids[pc->num].bv_val = pc->last;
 559                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 560                                 pc->uuids[pc->num].bv_len );
 561                         pc->num++;
 562                         pc->last = pc->uuids[pc->num].bv_val;
 563                         pc->uuids[pc->num].bv_val = NULL;
 564                 }
 565                 ret = LDAP_SUCCESS;
 566                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 567                         break;
 568                 /* FALLTHRU */
 569         case REP_RESULT:
 570                 ret = rs->sr_err;
 571                 if ( pc->num ) {
 572                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 573                                 0, pc->uuids, 0 );
 574                         pc->uuids[pc->num].bv_val = pc->last;
 575                         pc->num = 0;
 576                         pc->last = pc->uuids[0].bv_val;
 577                 }
 578                 break;
 579         default:
 580                 break;
 581         }
 582         return ret;
 583 }
 584
 585 static int
 586 syncprov_findcsn( Operation *op, find_csn_t mode )
 587 {
 588         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 589         syncprov_info_t         *si = on->on_bi.bi_private;
 590
 591         slap_callback cb = {0};
 592         Operation fop;
 593         SlapReply frs = { REP_RESULT };
 594         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 595         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 596         struct berval maxcsn;
 597         Filter cf;
 598         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 599         fpres_cookie pcookie;
 600         sync_control *srs = NULL;
 601         struct slap_limits_set fc_limits;
 602         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 603         int maxid;
 604
 605         if ( mode != FIND_MAXCSN ) {
 606                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 607         }
 608
 609         fop = *op;
 610         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 611         /* We want pure entries, not referrals */
 612         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 613
 614         cf.f_ava = &eq;
 615         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 616         BER_BVZERO( &cf.f_av_value );
 617         cf.f_next = NULL;
 618
 619         fop.o_callback = &cb;
 620         fop.ors_limit = NULL;
 621         fop.ors_tlimit = SLAP_NO_LIMIT;
 622         fop.ors_filter = &cf;
 623         fop.ors_filterstr.bv_val = buf;
 624
 625 again:
 626         switch( mode ) {
 627         case FIND_MAXCSN:
 628                 cf.f_choice = LDAP_FILTER_GE;
 629                 /* If there are multiple CSNs, use the one with our serverID */
 630                 for ( i=0; i<si->si_numcsns; i++) {
 631                         if ( slap_serverID == si->si_sids[i] ) {
 632                                 maxid = i;
 633                                 break;
 634                         }
 635                 }
 636                 if ( i == si->si_numcsns ) {
 637                         /* No match: this is multimaster, and none of the content in the DB
 638                          * originated locally. Treat like no CSN.
 639                          */
 640                         return LDAP_NO_SUCH_OBJECT;
 641                 }
 642                 cf.f_av_value = si->si_ctxcsn[maxid];
 643                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 644                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 645                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 646                         return LDAP_OTHER;
 647                 }
 648                 fop.ors_attrsonly = 0;
 649                 fop.ors_attrs = csn_anlist;
 650                 fop.ors_slimit = SLAP_NO_LIMIT;
 651                 cb.sc_private = &maxcsn;
 652                 cb.sc_response = findmax_cb;
 653                 strcpy( cbuf, cf.f_av_value.bv_val );
 654                 maxcsn.bv_val = cbuf;
 655                 maxcsn.bv_len = cf.f_av_value.bv_len;
 656                 break;
 657         case FIND_CSN:
 658                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 659                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 660                         /* If there are multiple CSNs, use the smallest */
 661                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 662                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 663                                         > 0 ) {
 664                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 665                                 }
 666                         }
 667                 }
 668                 /* Look for exact match the first time */
 669                 if ( findcsn_retry ) {
 670                         cf.f_choice = LDAP_FILTER_EQUALITY;
 671                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 672                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 673                 /* On retry, look for <= */
 674                 } else {
 675                         cf.f_choice = LDAP_FILTER_LE;
 676                         fop.ors_limit = &fc_limits;
 677                         memset( &fc_limits, 0, sizeof( fc_limits ));
 678                         fc_limits.lms_s_unchecked = 1;
 679                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 680                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 681                 }
 682                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 683                         return LDAP_OTHER;
 684                 }
 685                 fop.ors_attrsonly = 1;
 686                 fop.ors_attrs = slap_anlist_no_attrs;
 687                 fop.ors_slimit = 1;
 688                 cb.sc_private = NULL;
 689                 cb.sc_response = findcsn_cb;
 690                 break;
 691         case FIND_PRESENT:
 692                 fop.ors_filter = op->ors_filter;
 693                 fop.ors_filterstr = op->ors_filterstr;
 694                 fop.ors_attrsonly = 0;
 695                 fop.ors_attrs = uuid_anlist;
 696                 fop.ors_slimit = SLAP_NO_LIMIT;
 697                 cb.sc_private = &pcookie;
 698                 cb.sc_response = findpres_cb;
 699                 pcookie.num = 0;
 700
 701                 /* preallocate storage for a full set */
 702                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 703                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 704                         op->o_tmpmemctx );
 705                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 706                 pcookie.uuids[0].bv_val = pcookie.last;
 707                 pcookie.uuids[0].bv_len = UUID_LEN;
 708                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 709                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 710                         pcookie.uuids[i].bv_len = UUID_LEN;
 711                 }
 712                 break;
 713         }
 714
 715         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 716         fop.o_bd->be_search( &fop, &frs );
 717         fop.o_bd->bd_info = (BackendInfo *)on;
 718
 719         switch( mode ) {
 720         case FIND_MAXCSN:
 721                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 722 #ifdef CHECK_CSN
 723                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 724                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 725 #endif
 726                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 727                         si->si_numops++;        /* ensure a checkpoint */
 728                 }
 729                 break;
 730         case FIND_CSN:
 731                 /* If matching CSN was not found, invalidate the context. */
 732                 if ( !cb.sc_private ) {
 733                         /* If we didn't find an exact match, then try for <= */
 734                         if ( findcsn_retry ) {
 735                                 findcsn_retry = 0;
 736                                 goto again;
 737                         }
 738                         rc = LDAP_NO_SUCH_OBJECT;
 739                 }
 740                 break;
 741         case FIND_PRESENT:
 742                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 743                 break;
 744         }
 745
 746         return rc;
 747 }
 748
 749 /* Should find a place to cache these */
 750 static mutexint *get_mutexint()
 751 {
 752         mutexint *mi = ch_malloc( sizeof( mutexint ));
 753         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 754         mi->mi_int = 1;
 755         return mi;
 756 }
 757
 758 static void inc_mutexint( mutexint *mi )
 759 {
 760         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 761         mi->mi_int++;
 762         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 763 }
 764
 765 /* return resulting counter */
 766 static int dec_mutexint( mutexint *mi )
 767 {
 768         int i;
 769         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 770         i = --mi->mi_int;
 771         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 772         if ( !i ) {
 773                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 774                 ch_free( mi );
 775         }
 776         return i;
 777 }
 778
 779 static void
 780 syncprov_free_syncop( syncops *so )
 781 {
 782         syncres *sr, *srnext;
 783         GroupAssertion *ga, *gnext;
 784
 785         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 786         if ( --so->s_inuse > 0 ) {
 787                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 788                 return;
 789         }
 790         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 791         if ( so->s_flags & PS_IS_DETACHED ) {
 792                 filter_free( so->s_op->ors_filter );
 793                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 794                         gnext = ga->ga_next;
 795                         ch_free( ga );
 796                 }
 797                 ch_free( so->s_op );
 798         }
 799         ch_free( so->s_base.bv_val );
 800         for ( sr=so->s_res; sr; sr=srnext ) {
 801                 srnext = sr->s_next;
 802                 if ( sr->s_e ) {
 803                         if ( !dec_mutexint( sr->s_e->e_private )) {
 804                                 sr->s_e->e_private = NULL;
 805                                 entry_free( sr->s_e );
 806                         }
 807                 }
 808                 ch_free( sr );
 809         }
 810         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 811         ch_free( so );
 812 }
 813
 814 /* Send a persistent search response */
 815 static int
 816 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 817 {
 818         slap_overinst *on = opc->son;
 819
 820         SlapReply rs = { REP_SEARCH };
 821         LDAPControl *ctrls[2];
 822         struct berval cookie = BER_BVNULL, csns[2];
 823         Entry e_uuid = {0};
 824         Attribute a_uuid = {0};
 825
 826         if ( so->s_op->o_abandon )
 827                 return SLAPD_ABANDON;
 828
 829         ctrls[1] = NULL;
 830         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 831                 csns[0] = opc->sctxcsn;
 832                 BER_BVZERO( &csns[1] );
 833                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 834         }
 835
 836 #ifdef LDAP_DEBUG
 837         if ( so->s_sid > 0 ) {
 838                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 839                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 840         } else {
 841                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 842                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 843         }
 844 #endif
 845
 846         e_uuid.e_attrs = &a_uuid;
 847         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 848         a_uuid.a_nvals = &opc->suuid;
 849         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 850                 mode, ctrls, 0, 1, &cookie );
 851         if ( !BER_BVISNULL( &cookie )) {
 852                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 853         }
 854
 855         rs.sr_ctrls = ctrls;
 856         rs.sr_entry = &e_uuid;
 857         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 858                 e_uuid = *opc->se;
 859                 e_uuid.e_private = NULL;
 860         }
 861
 862         switch( mode ) {
 863         case LDAP_SYNC_ADD:
 864                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 865                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 866                         rs.sr_err = send_search_reference( op, &rs );
 867                         ber_bvarray_free( rs.sr_ref );
 868                         break;
 869                 }
 870                 /* fallthru */
 871         case LDAP_SYNC_MODIFY:
 872                 rs.sr_attrs = op->ors_attrs;
 873                 rs.sr_err = send_search_entry( op, &rs );
 874                 break;
 875         case LDAP_SYNC_DELETE:
 876                 e_uuid.e_attrs = NULL;
 877                 e_uuid.e_name = opc->sdn;
 878                 e_uuid.e_nname = opc->sndn;
 879                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 880                         struct berval bv = BER_BVNULL;
 881                         rs.sr_ref = &bv;
 882                         rs.sr_err = send_search_reference( op, &rs );
 883                 } else {
 884                         rs.sr_err = send_search_entry( op, &rs );
 885                 }
 886                 break;
 887         default:
 888                 assert(0);
 889         }
 890         /* In case someone else freed it already? */
 891         if ( rs.sr_ctrls ) {
 892                 int i;
 893                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 894                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 895                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 896                                 ctrls[0]->ldctl_value.bv_val = NULL;
 897                                 break;
 898                         }
 899                 }
 900                 rs.sr_ctrls = NULL;
 901         }
 902
 903         return rs.sr_err;
 904 }
 905
 906 static void
 907 syncprov_qstart( syncops *so );
 908
 909 /* Play back queued responses */
 910 static int
 911 syncprov_qplay( Operation *op, syncops *so )
 912 {
 913         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 914         syncres *sr;
 915         Entry *e;
 916         opcookie opc;
 917         int rc = 0;
 918
 919         opc.son = on;
 920
 921         do {
 922                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 923                 sr = so->s_res;
 924                 if ( sr )
 925                         so->s_res = sr->s_next;
 926                 if ( !so->s_res )
 927                         so->s_restail = NULL;
 928                 /* Exit loop with mutex held */
 929                 if ( !sr || so->s_op->o_abandon )
 930                         break;
 931                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 932
 933                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 934                         SlapReply rs = { REP_INTERMEDIATE };
 935
 936                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 937                                 &sr->s_csn, 0, NULL, 0 );
 938                 } else {
 939                         opc.sdn = sr->s_dn;
 940                         opc.sndn = sr->s_ndn;
 941                         opc.suuid = sr->s_uuid;
 942                         opc.sctxcsn = sr->s_csn;
 943                         opc.sreference = sr->s_isreference;
 944                         opc.se = sr->s_e;
 945
 946                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 947
 948                 }
 949                 if ( sr->s_e ) {
 950                         if ( !dec_mutexint( sr->s_e->e_private )) {
 951                                 sr->s_e->e_private = NULL;
 952                                 entry_free ( sr->s_e );
 953                         }
 954                 }
 955
 956                 ch_free( sr );
 957
 958                 /* Exit loop with mutex held */
 959                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 960
 961         } while (0);
 962
 963         /* We now only send one change at a time, to prevent one
 964          * psearch from hogging all the CPU. Resubmit this task if
 965          * there are more responses queued and no errors occurred.
 966          */
 967
 968         if ( rc == 0 && so->s_res ) {
 969                 syncprov_qstart( so );
 970         } else {
 971                 so->s_flags ^= PS_TASK_QUEUED;
 972         }
 973
 974         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 975         return rc;
 976 }
 977
 978 /* task for playing back queued responses */
 979 static void *
 980 syncprov_qtask( void *ctx, void *arg )
 981 {
 982         syncops *so = arg;
 983         OperationBuffer opbuf;
 984         Operation *op;
 985         BackendDB be;
 986         int rc;
 987
 988         op = &opbuf.ob_op;
 989         *op = *so->s_op;
 990         op->o_hdr = &opbuf.ob_hdr;
 991         op->o_controls = opbuf.ob_controls;
 992         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 993
 994         *op->o_hdr = *so->s_op->o_hdr;
 995
 996         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 997         op->o_tmpmfuncs = &slap_sl_mfuncs;
 998         op->o_threadctx = ctx;
 999
1000         /* syncprov_qplay expects a fake db */
1001         be = *so->s_op->o_bd;
1002         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1003         op->o_bd = &be;
1004         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1005         op->o_callback = NULL;
1006
1007         rc = syncprov_qplay( op, so );
1008
1009         /* decrement use count... */
1010         syncprov_free_syncop( so );
1011
1012         return NULL;
1013 }
1014
1015 /* Start the task to play back queued psearch responses */
1016 static void
1017 syncprov_qstart( syncops *so )
1018 {
1019         so->s_flags |= PS_TASK_QUEUED;
1020         so->s_inuse++;
1021         ldap_pvt_thread_pool_submit( &connection_pool,
1022                 syncprov_qtask, so );
1023 }
1024
1025 /* Queue a persistent search response */
1026 static int
1027 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1028 {
1029         syncres *sr;
1030         int srsize;
1031         struct berval cookie = opc->sctxcsn;
1032
1033         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1034                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1035
1036                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1037                         so->s_rid, slap_serverID ? slap_serverID : -1);
1038         }
1039
1040         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1041                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1042         if ( cookie.bv_len )
1043                 srsize += cookie.bv_len + 1;
1044         sr = ch_malloc( srsize );
1045         sr->s_next = NULL;
1046         sr->s_e = opc->se;
1047         /* bump refcount on this entry */
1048         if ( opc->se )
1049                 inc_mutexint( opc->se->e_private );
1050         sr->s_dn.bv_val = (char *)(sr + 1);
1051         sr->s_dn.bv_len = opc->sdn.bv_len;
1052         sr->s_mode = mode;
1053         sr->s_isreference = opc->sreference;
1054         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1055                  opc->sdn.bv_val ) + 1;
1056         sr->s_ndn.bv_len = opc->sndn.bv_len;
1057         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1058                  opc->sndn.bv_val ) + 1;
1059         sr->s_uuid.bv_len = opc->suuid.bv_len;
1060         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1061         if ( cookie.bv_len ) {
1062                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1063                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1064         } else {
1065                 sr->s_csn.bv_val = NULL;
1066         }
1067         sr->s_csn.bv_len = cookie.bv_len;
1068
1069         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1070                 ch_free( cookie.bv_val );
1071         }
1072
1073         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1074         if ( !so->s_res ) {
1075                 so->s_res = sr;
1076         } else {
1077                 so->s_restail->s_next = sr;
1078         }
1079         so->s_restail = sr;
1080
1081         /* If the base of the psearch was modified, check it next time round */
1082         if ( so->s_flags & PS_WROTE_BASE ) {
1083                 so->s_flags ^= PS_WROTE_BASE;
1084                 so->s_flags |= PS_FIND_BASE;
1085         }
1086         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1087                 syncprov_qstart( so );
1088         }
1089         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1090         return LDAP_SUCCESS;
1091 }
1092
1093 static int
1094 syncprov_drop_psearch( syncops *so, int lock )
1095 {
1096         if ( so->s_flags & PS_IS_DETACHED ) {
1097                 if ( lock )
1098                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1099                 so->s_op->o_conn->c_n_ops_executing--;
1100                 so->s_op->o_conn->c_n_ops_completed++;
1101                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1102                         o_next );
1103                 if ( lock )
1104                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1105         }
1106         syncprov_free_syncop( so );
1107
1108         return 0;
1109 }
1110
1111 static int
1112 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1113 {
1114         slap_callback *sc = op->o_callback;
1115         op->o_callback = sc->sc_next;
1116         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1117         op->o_tmpfree( sc, op->o_tmpmemctx );
1118         return 0;
1119 }
1120
1121 static int
1122 syncprov_op_abandon( Operation *op, SlapReply *rs )
1123 {
1124         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1125         syncprov_info_t         *si = on->on_bi.bi_private;
1126         syncops *so, *soprev;
1127
1128         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1129         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1130                 soprev=so, so=so->s_next ) {
1131                 if ( so->s_op->o_connid == op->o_connid &&
1132                         so->s_op->o_msgid == op->orn_msgid ) {
1133                                 so->s_op->o_abandon = 1;
1134                                 soprev->s_next = so->s_next;
1135                                 break;
1136                 }
1137         }
1138         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1139         if ( so ) {
1140                 /* Is this really a Cancel exop? */
1141                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1142                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1143                         rs->sr_err = LDAP_CANCELLED;
1144                         send_ldap_result( so->s_op, rs );
1145                         if ( so->s_flags & PS_IS_DETACHED ) {
1146                                 slap_callback *cb;
1147                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1148                                 cb->sc_cleanup = syncprov_ab_cleanup;
1149                                 cb->sc_next = op->o_callback;
1150                                 cb->sc_private = so;
1151                                 return SLAP_CB_CONTINUE;
1152                         }
1153                 }
1154                 syncprov_drop_psearch( so, 0 );
1155         }
1156         return SLAP_CB_CONTINUE;
1157 }
1158
1159 /* Find which persistent searches are affected by this operation */
1160 static void
1161 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1162 {
1163         slap_overinst *on = opc->son;
1164         syncprov_info_t         *si = on->on_bi.bi_private;
1165
1166         fbase_cookie fc;
1167         syncops *ss, *sprev, *snext;
1168         Entry *e = NULL;
1169         Attribute *a;
1170         int rc;
1171         struct berval newdn;
1172         int freefdn = 0;
1173         BackendDB *b0 = op->o_bd, db;
1174
1175         fc.fdn = &op->o_req_ndn;
1176         /* compute new DN */
1177         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1178                 struct berval pdn;
1179                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1180                 else dnParent( fc.fdn, &pdn );
1181                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1182                 fc.fdn = &newdn;
1183                 freefdn = 1;
1184         }
1185         if ( op->o_tag != LDAP_REQ_ADD ) {
1186                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1187                         db = *op->o_bd;
1188                         op->o_bd = &db;
1189                 }
1190                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1191                 /* If we're sending responses now, make a copy and unlock the DB */
1192                 if ( e && !saveit ) {
1193                         if ( !opc->se ) {
1194                                 opc->se = entry_dup( e );
1195                                 opc->se->e_private = get_mutexint();
1196                         }
1197                         overlay_entry_release_ov( op, e, 0, on );
1198                         e = opc->se;
1199                 }
1200                 if ( rc ) {
1201                         op->o_bd = b0;
1202                         return;
1203                 }
1204         } else {
1205                 e = op->ora_e;
1206                 if ( !saveit ) {
1207                         if ( !opc->se ) {
1208                                 opc->se = entry_dup( e );
1209                                 opc->se->e_private = get_mutexint();
1210                         }
1211                         e = opc->se;
1212                 }
1213         }
1214
1215         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1216                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1217                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1218                 opc->sreference = is_entry_referral( e );
1219                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1220                 if ( a )
1221                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1222         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1223                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1224                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1225                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1226                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1227         }
1228
1229         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1230         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1231                 sprev = ss, ss=snext)
1232         {
1233                 Operation op2;
1234                 Opheader oh;
1235                 syncmatches *sm;
1236                 int found = 0;
1237
1238                 snext = ss->s_next;
1239                 if ( ss->s_op->o_abandon )
1240                         continue;
1241
1242                 /* Don't send ops back to the originator */
1243                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1244                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1245                                 opc->osid, 0, 0 );
1246                         continue;
1247                 }
1248
1249                 /* Don't send ops back to the messenger */
1250                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1251                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1252                                 opc->rsid, 0, 0 );
1253                         continue;
1254                 }
1255
1256                 /* validate base */
1257                 fc.fss = ss;
1258                 fc.fbase = 0;
1259                 fc.fscope = 0;
1260
1261                 /* If the base of the search is missing, signal a refresh */
1262                 rc = syncprov_findbase( op, &fc );
1263                 if ( rc != LDAP_SUCCESS ) {
1264                         SlapReply rs = {REP_RESULT};
1265                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1266                                 "search base has changed" );
1267                         sprev->s_next = snext;
1268                         syncprov_drop_psearch( ss, 1 );
1269                         ss = sprev;
1270                         continue;
1271                 }
1272
1273                 /* If we're sending results now, look for this op in old matches */
1274                 if ( !saveit ) {
1275                         syncmatches *old;
1276
1277                         /* Did we modify the search base? */
1278                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1279                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1280                                 ss->s_flags |= PS_WROTE_BASE;
1281                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1282                         }
1283
1284                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1285                                 old=sm, sm=sm->sm_next ) {
1286                                 if ( sm->sm_op == ss ) {
1287                                         found = 1;
1288                                         old->sm_next = sm->sm_next;
1289                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1290                                         break;
1291                                 }
1292                         }
1293                 }
1294
1295                 if ( fc.fscope ) {
1296                         op2 = *ss->s_op;
1297                         oh = *op->o_hdr;
1298                         oh.oh_conn = ss->s_op->o_conn;
1299                         oh.oh_connid = ss->s_op->o_connid;
1300                         op2.o_bd = op->o_bd->bd_self;
1301                         op2.o_hdr = &oh;
1302                         op2.o_extra = op->o_extra;
1303                         op2.o_callback = NULL;
1304                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1305                         if (ss->s_flags & PS_FIX_FILTER) {
1306                                 /* Skip the AND/GE clause that we stuck on in front. We
1307                                    would lose deletes/mods that happen during the refresh
1308                                    phase otherwise (ITS#6555) */
1309                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1310                         }
1311                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1312                         rc = test_filter( &op2, e, op2.ors_filter );
1313                 }
1314
1315                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1316                         ss->s_sid, fc.fscope, rc );
1317
1318                 /* check if current o_req_dn is in scope and matches filter */
1319                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1320                         if ( saveit ) {
1321                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1322                                 sm->sm_next = opc->smatches;
1323                                 sm->sm_op = ss;
1324                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1325                                 ++ss->s_inuse;
1326                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1327                                 opc->smatches = sm;
1328                         } else {
1329                                 /* if found send UPDATE else send ADD */
1330                                 syncprov_qresp( opc, ss,
1331                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1332                         }
1333                 } else if ( !saveit && found ) {
1334                         /* send DELETE */
1335                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1336                 } else if ( !saveit ) {
1337                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1338                 }
1339                 if ( !saveit && found ) {
1340                         /* Decrement s_inuse, was incremented when called
1341                          * with saveit == TRUE
1342                          */
1343                         syncprov_free_syncop( ss );
1344                 }
1345         }
1346         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1347
1348         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1349                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1350                         op->o_bd = &db;
1351                 }
1352                 if ( saveit )
1353                         overlay_entry_release_ov( op, e, 0, on );
1354                 op->o_bd = b0;
1355         }
1356         if ( opc->se && !saveit ) {
1357                 if ( !dec_mutexint( opc->se->e_private )) {
1358                         opc->se->e_private = NULL;
1359                         entry_free( opc->se );
1360                         opc->se = NULL;
1361                 }
1362         }
1363         if ( freefdn ) {
1364                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1365         }
1366         op->o_bd = b0;
1367 }
1368
1369 static int
1370 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1371 {
1372         slap_callback *cb = op->o_callback;
1373         opcookie *opc = cb->sc_private;
1374         slap_overinst *on = opc->son;
1375         syncprov_info_t         *si = on->on_bi.bi_private;
1376         syncmatches *sm, *snext;
1377         modtarget *mt, mtdummy;
1378
1379         for (sm = opc->smatches; sm; sm=snext) {
1380                 snext = sm->sm_next;
1381                 syncprov_free_syncop( sm->sm_op );
1382                 op->o_tmpfree( sm, op->o_tmpmemctx );
1383         }
1384
1385         /* Remove op from lock table */
1386         mt = opc->smt;
1387         if ( mt ) {
1388                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1389                 mt->mt_mods = mt->mt_mods->mi_next;
1390                 /* If there are more, promote the next one */
1391                 if ( mt->mt_mods ) {
1392                         mt->mt_op = mt->mt_mods->mi_op;
1393                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1394                 } else {
1395                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1396                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1397                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1398                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1399                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1400                         ch_free( mt );
1401                 }
1402         }
1403         if ( !BER_BVISNULL( &opc->suuid ))
1404                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1405         if ( !BER_BVISNULL( &opc->sndn ))
1406                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1407         if ( !BER_BVISNULL( &opc->sdn ))
1408                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1409         op->o_callback = cb->sc_next;
1410         op->o_tmpfree(cb, op->o_tmpmemctx);
1411
1412         return 0;
1413 }
1414
1415 static void
1416 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1417 {
1418         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1419         Modifications mod;
1420         Operation opm;
1421         SlapReply rsm = { 0 };
1422         slap_callback cb = {0};
1423         BackendDB be;
1424         BackendInfo *bi;
1425
1426 #ifdef CHECK_CSN
1427         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1428
1429         int i;
1430         for ( i=0; i<si->si_numcsns; i++ ) {
1431                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1432         }
1433 #endif
1434         mod.sml_numvals = si->si_numcsns;
1435         mod.sml_values = si->si_ctxcsn;
1436         mod.sml_nvalues = NULL;
1437         mod.sml_desc = slap_schema.si_ad_contextCSN;
1438         mod.sml_op = LDAP_MOD_REPLACE;
1439         mod.sml_flags = SLAP_MOD_INTERNAL;
1440         mod.sml_next = NULL;
1441
1442         cb.sc_response = slap_null_cb;
1443         opm = *op;
1444         opm.o_tag = LDAP_REQ_MODIFY;
1445         opm.o_callback = &cb;
1446         opm.orm_modlist = &mod;
1447         opm.orm_no_opattrs = 1;
1448         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1449                 be = *on->on_info->oi_origdb;
1450                 opm.o_bd = &be;
1451         }
1452         opm.o_req_dn = si->si_contextdn;
1453         opm.o_req_ndn = si->si_contextdn;
1454         bi = opm.o_bd->bd_info;
1455         opm.o_bd->bd_info = on->on_info->oi_orig;
1456         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1457         opm.o_no_schema_check = 1;
1458         opm.o_bd->be_modify( &opm, &rsm );
1459
1460         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1461                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1462                 const char      *text;
1463                 char txtbuf[SLAP_TEXT_BUFLEN];
1464                 size_t textlen = sizeof txtbuf;
1465                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1466                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1467                 opm.ora_e = e;
1468                 opm.o_bd->be_add( &opm, &rsm );
1469                 if ( e == opm.ora_e )
1470                         be_entry_release_w( &opm, opm.ora_e );
1471         }
1472         opm.o_bd->bd_info = bi;
1473
1474         if ( mod.sml_next != NULL ) {
1475                 slap_mods_free( mod.sml_next, 1 );
1476         }
1477 #ifdef CHECK_CSN
1478         for ( i=0; i<si->si_numcsns; i++ ) {
1479                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1480         }
1481 #endif
1482 }
1483
1484 static void
1485 syncprov_add_slog( Operation *op )
1486 {
1487         opcookie *opc = op->o_callback->sc_private;
1488         slap_overinst *on = opc->son;
1489         syncprov_info_t         *si = on->on_bi.bi_private;
1490         sessionlog *sl;
1491         slog_entry *se;
1492
1493         sl = si->si_logs;
1494         {
1495                 /* Allocate a record. UUIDs are not NUL-terminated. */
1496                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1497                         op->o_csn.bv_len + 1 );
1498                 se->se_next = NULL;
1499                 se->se_tag = op->o_tag;
1500
1501                 se->se_uuid.bv_val = (char *)(&se[1]);
1502                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1503                 se->se_uuid.bv_len = opc->suuid.bv_len;
1504
1505                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1506                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1507                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1508                 se->se_csn.bv_len = op->o_csn.bv_len;
1509                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1510
1511                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1512                 if ( sl->sl_head ) {
1513                         sl->sl_tail->se_next = se;
1514                 } else {
1515                         sl->sl_head = se;
1516                 }
1517                 sl->sl_tail = se;
1518                 sl->sl_num++;
1519                 while ( sl->sl_num > sl->sl_size ) {
1520                         se = sl->sl_head;
1521                         sl->sl_head = se->se_next;
1522                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1523                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1524                         ch_free( se );
1525                         sl->sl_num--;
1526                 }
1527                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1528         }
1529 }
1530
1531 /* Just set a flag if we found the matching entry */
1532 static int
1533 playlog_cb( Operation *op, SlapReply *rs )
1534 {
1535         if ( rs->sr_type == REP_SEARCH ) {
1536                 op->o_callback->sc_private = (void *)1;
1537         }
1538         return rs->sr_err;
1539 }
1540
1541 /* enter with sl->sl_mutex locked, release before returning */
1542 static void
1543 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1544         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1545 {
1546         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1547         slog_entry *se;
1548         int i, j, ndel, num, nmods, mmods;
1549         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1550         BerVarray uuids;
1551         struct berval delcsn[2];
1552
1553         if ( !sl->sl_num ) {
1554                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1555                 return;
1556         }
1557
1558         num = sl->sl_num;
1559         i = 0;
1560         nmods = 0;
1561
1562         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1563                 num * UUID_LEN, op->o_tmpmemctx );
1564         uuids[0].bv_val = (char *)(uuids + num + 1);
1565
1566         delcsn[0].bv_len = 0;
1567         delcsn[0].bv_val = cbuf;
1568         BER_BVZERO(&delcsn[1]);
1569
1570         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1571          * and everything else at the end. Do this first so we can
1572          * unlock the list mutex.
1573          */
1574         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1575                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1576         for ( se=sl->sl_head; se; se=se->se_next ) {
1577                 int k;
1578                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1579                 ndel = 1;
1580                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1581                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1582                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1583                                 break;
1584                         }
1585                 }
1586                 if ( ndel <= 0 ) {
1587                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1588                         continue;
1589                 }
1590                 ndel = 0;
1591                 for ( k=0; k<numcsns; k++ ) {
1592                         if ( se->se_sid == sids[k] ) {
1593                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1594                                 break;
1595                         }
1596                 }
1597                 if ( ndel > 0 ) {
1598                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1599                         break;
1600                 }
1601                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1602                         j = i;
1603                         i++;
1604                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1605                         delcsn[0].bv_len = se->se_csn.bv_len;
1606                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1607                 } else {
1608                         nmods++;
1609                         j = num - nmods;
1610                 }
1611                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1612                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1613                 uuids[j].bv_len = UUID_LEN;
1614         }
1615         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1616
1617         ndel = i;
1618
1619         /* Zero out unused slots */
1620         for ( i=ndel; i < num - nmods; i++ )
1621                 uuids[i].bv_len = 0;
1622
1623         /* Mods must be validated to see if they belong in this delete set.
1624          */
1625
1626         mmods = nmods;
1627         /* Strip any duplicates */
1628         for ( i=0; i<nmods; i++ ) {
1629                 for ( j=0; j<ndel; j++ ) {
1630                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1631                                 uuids[num - 1 - i].bv_len = 0;
1632                                 mmods --;
1633                                 break;
1634                         }
1635                 }
1636                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1637                 for ( j=0; j<i; j++ ) {
1638                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1639                                 uuids[num - 1 - i].bv_len = 0;
1640                                 mmods --;
1641                                 break;
1642                         }
1643                 }
1644         }
1645
1646         if ( mmods ) {
1647                 Operation fop;
1648                 SlapReply frs = { REP_RESULT };
1649                 int rc;
1650                 Filter mf, af;
1651                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1652                 slap_callback cb = {0};
1653
1654                 fop = *op;
1655
1656                 fop.o_sync_mode = 0;
1657                 fop.o_callback = &cb;
1658                 fop.ors_limit = NULL;
1659                 fop.ors_tlimit = SLAP_NO_LIMIT;
1660                 fop.ors_attrs = slap_anlist_all_attributes;
1661                 fop.ors_attrsonly = 0;
1662                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1663
1664                 af.f_choice = LDAP_FILTER_AND;
1665                 af.f_next = NULL;
1666                 af.f_and = &mf;
1667                 mf.f_choice = LDAP_FILTER_EQUALITY;
1668                 mf.f_ava = &eq;
1669                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1670                 mf.f_next = fop.ors_filter;
1671
1672                 fop.ors_filter = &af;
1673
1674                 cb.sc_response = playlog_cb;
1675                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1676
1677                 for ( i=ndel; i<num; i++ ) {
1678                         if ( uuids[i].bv_len == 0 ) continue;
1679
1680                         mf.f_av_value = uuids[i];
1681                         cb.sc_private = NULL;
1682                         fop.ors_slimit = 1;
1683                         frs.sr_nentries = 0;
1684                         rc = fop.o_bd->be_search( &fop, &frs );
1685
1686                         /* If entry was not found, add to delete list */
1687                         if ( !cb.sc_private ) {
1688                                 uuids[ndel++] = uuids[i];
1689                         }
1690                 }
1691                 fop.o_bd->bd_info = (BackendInfo *)on;
1692         }
1693         if ( ndel ) {
1694                 struct berval cookie;
1695
1696                 if ( delcsn[0].bv_len ) {
1697                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1698                                 slap_serverID ? slap_serverID : -1 );
1699
1700                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1701                 }
1702
1703                 uuids[ndel].bv_val = NULL;
1704                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1705                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1706                 if ( delcsn[0].bv_len ) {
1707                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1708                 }
1709         }
1710         op->o_tmpfree( uuids, op->o_tmpmemctx );
1711 }
1712
1713 static int
1714 syncprov_op_response( Operation *op, SlapReply *rs )
1715 {
1716         opcookie *opc = op->o_callback->sc_private;
1717         slap_overinst *on = opc->son;
1718         syncprov_info_t         *si = on->on_bi.bi_private;
1719         syncmatches *sm;
1720
1721         if ( rs->sr_err == LDAP_SUCCESS )
1722         {
1723                 struct berval maxcsn;
1724                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1725                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1726
1727                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1728
1729                 /* Update our context CSN */
1730                 cbuf[0] = '\0';
1731                 maxcsn.bv_val = cbuf;
1732                 maxcsn.bv_len = sizeof(cbuf);
1733                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1734
1735                 slap_get_commit_csn( op, &maxcsn, &foundit );
1736                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1737                         /* syncrepl queues the CSN values in the db where
1738                          * it is configured , not where the changes are made.
1739                          * So look for a value in the glue db if we didn't
1740                          * find any in this db.
1741                          */
1742                         BackendDB *be = op->o_bd;
1743                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1744                         maxcsn.bv_val = cbuf;
1745                         maxcsn.bv_len = sizeof(cbuf);
1746                         slap_get_commit_csn( op, &maxcsn, &foundit );
1747                         op->o_bd = be;
1748                 }
1749                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1750                         int i, sid;
1751 #ifdef CHECK_CSN
1752                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1753                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1754 #endif
1755                         sid = slap_parse_csn_sid( &maxcsn );
1756                         for ( i=0; i<si->si_numcsns; i++ ) {
1757                                 if ( sid == si->si_sids[i] ) {
1758                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1759                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1760                                                 csn_changed = 1;
1761                                         }
1762                                         break;
1763                                 }
1764                         }
1765                         /* It's a new SID for us */
1766                         if ( i == si->si_numcsns ) {
1767                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1768                                 csn_changed = 1;
1769                                 si->si_numcsns++;
1770                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1771                                         sizeof(int));
1772                                 si->si_sids[i] = sid;
1773                         }
1774                 }
1775
1776                 /* Don't do any processing for consumer contextCSN updates */
1777                 if ( op->o_dont_replicate ) {
1778                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1779                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1780                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1781                         /* Catch contextCSN updates from syncrepl. We have to look at
1782                          * all the attribute values, as there may be more than one csn
1783                          * that changed, and only one can be passed in the csn queue.
1784                          */
1785                         Modifications *mod = op->orm_modlist;
1786                         int i, j, sid;
1787
1788                         for ( i=0; i<mod->sml_numvals; i++ ) {
1789                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1790                                 for ( j=0; j<si->si_numcsns; j++ ) {
1791                                         if ( sid == si->si_sids[j] ) {
1792                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1793                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1794                                                         csn_changed = 1;
1795                                                 }
1796                                                 break;
1797                                         }
1798                                 }
1799
1800                                 if ( j == si->si_numcsns ) {
1801                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1802                                         si->si_numcsns++;
1803                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1804                                                 sizeof(int));
1805                                         si->si_sids[j] = sid;
1806                                         csn_changed = 1;
1807                                 }
1808                         }
1809                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1810
1811                         if ( csn_changed ) {
1812                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1813                                 have_psearches = ( si->si_ops != NULL );
1814                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1815
1816                                 if ( have_psearches ) {
1817                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1818                                                 if ( sm->sm_op->s_op->o_abandon )
1819                                                         continue;
1820                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1821                                         }
1822                                 }
1823                         }
1824                         } else {
1825                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1826                         }
1827                         goto leave;
1828                 }
1829
1830                 si->si_numops++;
1831                 if ( si->si_chkops || si->si_chktime ) {
1832                         /* Never checkpoint adding the context entry,
1833                          * it will deadlock
1834                          */
1835                         if ( op->o_tag != LDAP_REQ_ADD ||
1836                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1837                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1838                                         do_check = 1;
1839                                         si->si_numops = 0;
1840                                 }
1841                                 if ( si->si_chktime &&
1842                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1843                                         if ( si->si_chklast ) {
1844                                                 do_check = 1;
1845                                                 si->si_chklast = op->o_time;
1846                                         } else {
1847                                                 si->si_chklast = 1;
1848                                         }
1849                                 }
1850                         }
1851                 }
1852                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1853
1854                 if ( do_check ) {
1855                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1856                         syncprov_checkpoint( op, rs, on );
1857                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1858                 }
1859
1860                 /* only update consumer ctx if this is a newer csn */
1861                 if ( csn_changed ) {
1862                         opc->sctxcsn = maxcsn;
1863                 }
1864
1865                 /* Handle any persistent searches */
1866                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1867                 have_psearches = ( si->si_ops != NULL );
1868                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1869                 if ( have_psearches ) {
1870                         switch(op->o_tag) {
1871                         case LDAP_REQ_ADD:
1872                         case LDAP_REQ_MODIFY:
1873                         case LDAP_REQ_MODRDN:
1874                         case LDAP_REQ_EXTENDED:
1875                                 syncprov_matchops( op, opc, 0 );
1876                                 break;
1877                         case LDAP_REQ_DELETE:
1878                                 /* for each match in opc->smatches:
1879                                  *   send DELETE msg
1880                                  */
1881                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1882                                         if ( sm->sm_op->s_op->o_abandon )
1883                                                 continue;
1884                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1885                                 }
1886                                 break;
1887                         }
1888                 }
1889
1890                 /* Add any log records */
1891                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1892                         syncprov_add_slog( op );
1893                 }
1894 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1895         }
1896         return SLAP_CB_CONTINUE;
1897 }
1898
1899 /* We don't use a subentry to store the context CSN any more.
1900  * We expose the current context CSN as an operational attribute
1901  * of the suffix entry.
1902  */
1903 static int
1904 syncprov_op_compare( Operation *op, SlapReply *rs )
1905 {
1906         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1907         syncprov_info_t         *si = on->on_bi.bi_private;
1908         int rc = SLAP_CB_CONTINUE;
1909
1910         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1911                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1912         {
1913                 Entry e = {0};
1914                 Attribute a = {0};
1915
1916                 e.e_name = si->si_contextdn;
1917                 e.e_nname = si->si_contextdn;
1918                 e.e_attrs = &a;
1919
1920                 a.a_desc = slap_schema.si_ad_contextCSN;
1921
1922                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1923
1924                 a.a_vals = si->si_ctxcsn;
1925                 a.a_nvals = a.a_vals;
1926                 a.a_numvals = si->si_numcsns;
1927
1928                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1929                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1930                 if ( ! rs->sr_err ) {
1931                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1932                         goto return_results;
1933                 }
1934
1935                 if ( get_assert( op ) &&
1936                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1937                 {
1938                         rs->sr_err = LDAP_ASSERTION_FAILED;
1939                         goto return_results;
1940                 }
1941
1942
1943                 rs->sr_err = LDAP_COMPARE_FALSE;
1944
1945                 if ( attr_valfind( &a,
1946                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1947                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1948                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1949                 {
1950                         rs->sr_err = LDAP_COMPARE_TRUE;
1951                 }
1952
1953 return_results:;
1954
1955                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1956
1957                 send_ldap_result( op, rs );
1958
1959                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1960                         rs->sr_err = LDAP_SUCCESS;
1961                 }
1962                 rc = rs->sr_err;
1963         }
1964
1965         return rc;
1966 }
1967
1968 static int
1969 syncprov_op_mod( Operation *op, SlapReply *rs )
1970 {
1971         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1972         syncprov_info_t         *si = on->on_bi.bi_private;
1973         slap_callback *cb;
1974         opcookie *opc;
1975         int have_psearches, cbsize;
1976
1977         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1978         have_psearches = ( si->si_ops != NULL );
1979         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1980
1981         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1982                 (have_psearches ? sizeof(modinst) : 0 );
1983
1984         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1985         opc = (opcookie *)(cb+1);
1986         opc->son = on;
1987         cb->sc_response = syncprov_op_response;
1988         cb->sc_cleanup = syncprov_op_cleanup;
1989         cb->sc_private = opc;
1990         cb->sc_next = op->o_callback;
1991         op->o_callback = cb;
1992
1993         opc->osid = -1;
1994         opc->rsid = -1;
1995         if ( op->o_csn.bv_val ) {
1996                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1997         }
1998         if ( op->o_controls ) {
1999                 struct sync_cookie *scook =
2000                 op->o_controls[slap_cids.sc_LDAPsync];
2001                 if ( scook )
2002                         opc->rsid = scook->sid;
2003         }
2004
2005         /* If there are active persistent searches, lock this operation.
2006          * See seqmod.c for the locking logic on its own.
2007          */
2008         if ( have_psearches ) {
2009                 modtarget *mt, mtdummy;
2010                 modinst *mi;
2011
2012                 mi = (modinst *)(opc+1);
2013                 mi->mi_op = op;
2014
2015                 /* See if we're already modifying this entry... */
2016                 mtdummy.mt_op = op;
2017                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2018                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2019                 if ( mt ) {
2020                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2021                         if ( mt->mt_mods == NULL ) {
2022                                 /* Cannot reuse this mt, as another thread is about
2023                                  * to release it in syncprov_op_cleanup.
2024                                  */
2025                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2026                                 mt = NULL;
2027                         }
2028                 }
2029                 if ( mt ) {
2030                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2031                         mt->mt_tail->mi_next = mi;
2032                         mt->mt_tail = mi;
2033                         /* wait for this op to get to head of list */
2034                         while ( mt->mt_mods != mi ) {
2035                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2036                                 /* FIXME: if dynamic config can delete overlays or
2037                                  * databases we'll have to check for cleanup here.
2038                                  * Currently it's not an issue because there are
2039                                  * no dynamic config deletes...
2040                                  */
2041                                 if ( slapd_shutdown )
2042                                         return SLAPD_ABANDON;
2043
2044                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2045                                         ldap_pvt_thread_yield();
2046                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2047
2048                                 /* clean up if the caller is giving up */
2049                                 if ( op->o_abandon ) {
2050                                         modinst *m2;
2051                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2052                                                 m2 = m2->mi_next );
2053                                         m2->mi_next = mi->mi_next;
2054                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2055                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2056                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2057                                         return SLAPD_ABANDON;
2058                                 }
2059                         }
2060                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2061                 } else {
2062                         /* Record that we're modifying this entry now */
2063                         mt = ch_malloc( sizeof(modtarget) );
2064                         mt->mt_mods = mi;
2065                         mt->mt_tail = mi;
2066                         mt->mt_op = mi->mi_op;
2067                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2068                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2069                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2070                 }
2071                 opc->smt = mt;
2072         }
2073
2074         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2075                 syncprov_matchops( op, opc, 1 );
2076
2077         return SLAP_CB_CONTINUE;
2078 }
2079
2080 static int
2081 syncprov_op_extended( Operation *op, SlapReply *rs )
2082 {
2083         if ( exop_is_write( op ))
2084                 return syncprov_op_mod( op, rs );
2085
2086         return SLAP_CB_CONTINUE;
2087 }
2088
2089 typedef struct searchstate {
2090         slap_overinst *ss_on;
2091         syncops *ss_so;
2092         BerVarray ss_ctxcsn;
2093         int *ss_sids;
2094         int ss_numcsns;
2095 #define SS_PRESENT      0x01
2096 #define SS_CHANGED      0x02
2097         int ss_flags;
2098 } searchstate;
2099
2100 static int
2101 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2102 {
2103         if ( rs->sr_ctrls ) {
2104                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2105                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2106                 rs->sr_ctrls = NULL;
2107         }
2108         return 0;
2109 }
2110
2111 typedef struct SyncOperationBuffer {
2112         Operation               sob_op;
2113         Opheader                sob_hdr;
2114         OpExtra                 sob_oe;
2115         AttributeName   sob_extra;      /* not always present */
2116         /* Further data allocated here */
2117 } SyncOperationBuffer;
2118
2119 static void
2120 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2121 {
2122         SyncOperationBuffer *sopbuf2;
2123         Operation *op2;
2124         int i, alen = 0;
2125         size_t size;
2126         char *ptr;
2127         GroupAssertion *g1, *g2;
2128
2129         /* count the search attrs */
2130         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2131                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2132         }
2133         /* Make a new copy of the operation */
2134         size = offsetof( SyncOperationBuffer, sob_extra ) +
2135                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2136                 op->o_req_dn.bv_len + 1 +
2137                 op->o_req_ndn.bv_len + 1 +
2138                 op->o_ndn.bv_len + 1 +
2139                 so->s_filterstr.bv_len + 1;
2140         sopbuf2 = ch_calloc( 1, size );
2141         op2 = &sopbuf2->sob_op;
2142         op2->o_hdr = &sopbuf2->sob_hdr;
2143         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2144
2145         /* Copy the fields we care about explicitly, leave the rest alone */
2146         *op2->o_hdr = *op->o_hdr;
2147         op2->o_tag = op->o_tag;
2148         op2->o_time = op->o_time;
2149         op2->o_bd = on->on_info->oi_origdb;
2150         op2->o_request = op->o_request;
2151         op2->o_managedsait = op->o_managedsait;
2152         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2153         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2154
2155         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2156         if ( i ) {
2157                 op2->ors_attrs = (AttributeName *) ptr;
2158                 ptr = (char *) &op2->ors_attrs[i+1];
2159                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2160                         op2->ors_attrs[i] = op->ors_attrs[i];
2161                         op2->ors_attrs[i].an_name.bv_val = ptr;
2162                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2163                 }
2164                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2165         }
2166
2167         op2->o_authz = op->o_authz;
2168         op2->o_ndn.bv_val = ptr;
2169         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2170         op2->o_dn = op2->o_ndn;
2171         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2172         op2->o_req_dn.bv_val = ptr;
2173         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2174         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2175         op2->o_req_ndn.bv_val = ptr;
2176         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2177         op2->ors_filterstr.bv_val = ptr;
2178         strcpy( ptr, so->s_filterstr.bv_val );
2179         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2180
2181         /* Skip the AND/GE clause that we stuck on in front */
2182         if ( so->s_flags & PS_FIX_FILTER ) {
2183                 op2->ors_filter = op->ors_filter->f_and->f_next;
2184                 so->s_flags ^= PS_FIX_FILTER;
2185         } else {
2186                 op2->ors_filter = op->ors_filter;
2187         }
2188         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2189         so->s_op = op2;
2190
2191         /* Copy any cached group ACLs individually */
2192         op2->o_groups = NULL;
2193         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2194                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2195                 *g2 = *g1;
2196                 strcpy( g2->ga_ndn, g1->ga_ndn );
2197                 g2->ga_next = op2->o_groups;
2198                 op2->o_groups = g2;
2199         }
2200         /* Don't allow any further group caching */
2201         op2->o_do_not_cache = 1;
2202
2203         /* Add op2 to conn so abandon will find us */
2204         op->o_conn->c_n_ops_executing++;
2205         op->o_conn->c_n_ops_completed--;
2206         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2207         so->s_flags |= PS_IS_DETACHED;
2208
2209         /* Prevent anyone else from trying to send a result for this op */
2210         op->o_abandon = 1;
2211 }
2212
2213 static int
2214 syncprov_search_response( Operation *op, SlapReply *rs )
2215 {
2216         searchstate *ss = op->o_callback->sc_private;
2217         slap_overinst *on = ss->ss_on;
2218         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2219         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2220
2221         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2222                 Attribute *a;
2223                 /* If we got a referral without a referral object, there's
2224                  * something missing that we cannot replicate. Just ignore it.
2225                  * The consumer will abort because we didn't send the expected
2226                  * control.
2227                  */
2228                 if ( !rs->sr_entry ) {
2229                         assert( rs->sr_entry != NULL );
2230                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2231                         return SLAP_CB_CONTINUE;
2232                 }
2233                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2234                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2235                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2236                 }
2237                 if ( a ) {
2238                         int i, sid;
2239                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2240
2241                         /* Don't send changed entries back to the originator */
2242                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2243                                 Debug( LDAP_DEBUG_SYNC,
2244                                         "Entry %s changed by peer, ignored\n",
2245                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2246                                 return LDAP_SUCCESS;
2247                         }
2248
2249                         /* If not a persistent search */
2250                         if ( !ss->ss_so ) {
2251                                 /* Make sure entry is less than the snapshot'd contextCSN */
2252                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2253                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2254                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2255                                                 Debug( LDAP_DEBUG_SYNC,
2256                                                         "Entry %s CSN %s greater than snapshot %s\n",
2257                                                         rs->sr_entry->e_name.bv_val,
2258                                                         a->a_nvals[0].bv_val,
2259                                                         ss->ss_ctxcsn[i].bv_val );
2260                                                 return LDAP_SUCCESS;
2261                                         }
2262                                 }
2263                         }
2264
2265                         /* Don't send old entries twice */
2266                         if ( srs->sr_state.ctxcsn ) {
2267                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2268                                         if ( sid == srs->sr_state.sids[i] &&
2269                                                 ber_bvcmp( &a->a_nvals[0],
2270                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2271                                                 Debug( LDAP_DEBUG_SYNC,
2272                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2273                                                         rs->sr_entry->e_name.bv_val,
2274                                                         a->a_nvals[0].bv_val,
2275                                                         srs->sr_state.ctxcsn[i].bv_val );
2276                                                 return LDAP_SUCCESS;
2277                                         }
2278                                 }
2279                         }
2280                 }
2281                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2282                         op->o_tmpmemctx );
2283                 rs->sr_ctrls[1] = NULL;
2284                 /* If we're in delta-sync mode, always send a cookie */
2285                 if ( si->si_nopres && si->si_usehint && a ) {
2286                         struct berval cookie;
2287                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2288                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2289                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2290                 } else {
2291                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2292                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2293                 }
2294         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2295                 struct berval cookie = BER_BVNULL;
2296
2297                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2298                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2299                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2300                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2301
2302                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2303                 }
2304
2305                 /* Is this a regular refresh?
2306                  * Note: refresh never gets here if there were no changes
2307                  */
2308                 if ( !ss->ss_so ) {
2309                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2310                                 op->o_tmpmemctx );
2311                         rs->sr_ctrls[1] = NULL;
2312                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2313                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2314                                         LDAP_SYNC_REFRESH_DELETES );
2315                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2316                 } else {
2317                 /* It's RefreshAndPersist, transition to Persist phase */
2318                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2319                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2320                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2321                                 1, NULL, 0 );
2322                         if ( !BER_BVISNULL( &cookie ))
2323                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2324
2325                         /* Detach this Op from frontend control */
2326                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2327
2328                         /* But not if this connection was closed along the way */
2329                         if ( op->o_abandon ) {
2330                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2331                                 /* syncprov_ab_cleanup will free this syncop */
2332                                 return SLAPD_ABANDON;
2333
2334                         } else {
2335                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2336                                 /* Turn off the refreshing flag */
2337                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2338
2339                                 syncprov_detach_op( op, ss->ss_so, on );
2340
2341                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2342
2343                                 /* If there are queued responses, fire them off */
2344                                 if ( ss->ss_so->s_res )
2345                                         syncprov_qstart( ss->ss_so );
2346                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2347                         }
2348
2349                         return LDAP_SUCCESS;
2350                 }
2351         }
2352
2353         return SLAP_CB_CONTINUE;
2354 }
2355
2356 static int
2357 syncprov_op_search( Operation *op, SlapReply *rs )
2358 {
2359         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2360         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2361         slap_callback   *cb;
2362         int gotstate = 0, changed = 0, do_present = 0;
2363         syncops *sop = NULL;
2364         searchstate *ss;
2365         sync_control *srs;
2366         BerVarray ctxcsn;
2367         int i, *sids, numcsns;
2368         struct berval mincsn;
2369
2370         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2371
2372         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2373                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2374                 return rs->sr_err;
2375         }
2376
2377         srs = op->o_controls[slap_cids.sc_LDAPsync];
2378
2379         /* If this is a persistent search, set it up right away */
2380         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2381                 syncops so = {0};
2382                 fbase_cookie fc;
2383                 opcookie opc;
2384                 slap_callback sc;
2385
2386                 fc.fss = &so;
2387                 fc.fbase = 0;
2388                 so.s_eid = NOID;
2389                 so.s_op = op;
2390                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2391                 /* syncprov_findbase expects to be called as a callback... */
2392                 sc.sc_private = &opc;
2393                 opc.son = on;
2394                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2395                 cb = op->o_callback;
2396                 op->o_callback = &sc;
2397                 rs->sr_err = syncprov_findbase( op, &fc );
2398                 op->o_callback = cb;
2399                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2400
2401                 if ( rs->sr_err != LDAP_SUCCESS ) {
2402                         send_ldap_result( op, rs );
2403                         return rs->sr_err;
2404                 }
2405                 sop = ch_malloc( sizeof( syncops ));
2406                 *sop = so;
2407                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2408                 sop->s_rid = srs->sr_state.rid;
2409                 sop->s_sid = srs->sr_state.sid;
2410                 sop->s_inuse = 1;
2411
2412                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2413                 sop->s_next = si->si_ops;
2414                 si->si_ops = sop;
2415                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2416         }
2417
2418         /* snapshot the ctxcsn */
2419         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2420         numcsns = si->si_numcsns;
2421         if ( numcsns ) {
2422                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2423                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2424                 for ( i=0; i<numcsns; i++ )
2425                         sids[i] = si->si_sids[i];
2426         } else {
2427                 ctxcsn = NULL;
2428                 sids = NULL;
2429         }
2430         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2431
2432         /* If we have a cookie, handle the PRESENT lookups */
2433         if ( srs->sr_state.ctxcsn ) {
2434                 sessionlog *sl;
2435                 int i, j;
2436
2437                 /* If we don't have any CSN of our own yet, pretend nothing
2438                  * has changed.
2439                  */
2440                 if ( !numcsns )
2441                         goto no_change;
2442
2443                 if ( !si->si_nopres )
2444                         do_present = SS_PRESENT;
2445
2446                 /* If there are SIDs we don't recognize in the cookie, drop them */
2447                 for (i=0; i<srs->sr_state.numcsns; ) {
2448                         for (j=0; j<numcsns; j++) {
2449                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2450                                         break;
2451                                 }
2452                         }
2453                         /* not found */
2454                         if ( j == numcsns ) {
2455                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2456                                 j = srs->sr_state.numcsns - 1;
2457                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2458                                 tmp.bv_len = 0;
2459                                 srs->sr_state.ctxcsn[j] = tmp;
2460                                 srs->sr_state.numcsns = j;
2461                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2462                                 continue;
2463                         }
2464                         i++;
2465                 }
2466
2467                 /* Find the smallest CSN */
2468                 mincsn = srs->sr_state.ctxcsn[0];
2469                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2470                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2471                                 mincsn = srs->sr_state.ctxcsn[i];
2472                 }
2473
2474                 /* If nothing has changed, shortcut it */
2475                 if ( srs->sr_state.numcsns == numcsns ) {
2476                         int i, j, newer;
2477                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2478                                 for ( j=0; j<numcsns; j++ ) {
2479                                         if ( srs->sr_state.sids[i] != sids[j] )
2480                                                 continue;
2481                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2482                                         /* If our state is newer, tell consumer about changes */
2483                                         if ( newer < 0 )
2484                                                 changed = SS_CHANGED;
2485                                         else if ( newer > 0 ) {
2486                                         /* our state is older, tell consumer nothing */
2487                                                 rs->sr_err = LDAP_SUCCESS;
2488 bailout:
2489                                                 if ( sop ) {
2490                                                         syncops **sp = &si->si_ops;
2491
2492                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2493                                                         while ( *sp != sop )
2494                                                                 sp = &(*sp)->s_next;
2495                                                         *sp = sop->s_next;
2496                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2497                                                         ch_free( sop );
2498                                                 }
2499                                                 rs->sr_ctrls = NULL;
2500                                                 send_ldap_result( op, rs );
2501                                                 return rs->sr_err;
2502                                         }
2503                                         break;
2504                                 }
2505                                 if ( changed )
2506                                         break;
2507                         }
2508                         if ( !changed ) {
2509                                 do_present = 0;
2510 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2511                                         LDAPControl     *ctrls[2];
2512
2513                                         ctrls[0] = NULL;
2514                                         ctrls[1] = NULL;
2515                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2516                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2517                                         rs->sr_ctrls = ctrls;
2518                                         rs->sr_err = LDAP_SUCCESS;
2519                                         send_ldap_result( op, rs );
2520                                         rs->sr_ctrls = NULL;
2521                                         return rs->sr_err;
2522                                 }
2523                                 goto shortcut;
2524                         }
2525                 } else {
2526                         /* consumer doesn't have the right number of CSNs */
2527                         changed = SS_CHANGED;
2528                 }
2529                 /* Do we have a sessionlog for this search? */
2530                 sl=si->si_logs;
2531                 if ( sl ) {
2532                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2533                         /* Are there any log entries, and is the consumer state
2534                          * present in the session log?
2535                          */
2536                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2537                                 do_present = 0;
2538                                 /* mutex is unlocked in playlog */
2539                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2540                         } else {
2541                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2542                         }
2543                 }
2544                 /* Is the CSN still present in the database? */
2545                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2546                         /* No, so a reload is required */
2547                         /* the 2.2 consumer doesn't send this hint */
2548                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2549                                 if ( ctxcsn )
2550                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2551                                 if ( sids )
2552                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2553                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2554                                 rs->sr_text = "sync cookie is stale";
2555                                 goto bailout;
2556                         }
2557                         if ( srs->sr_state.ctxcsn ) {
2558                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2559                                 srs->sr_state.ctxcsn = NULL;
2560                         }
2561                         if ( srs->sr_state.sids ) {
2562                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2563                                 srs->sr_state.sids = NULL;
2564                         }
2565                         srs->sr_state.numcsns = 0;
2566                 } else {
2567                         gotstate = 1;
2568                         /* If changed and doing Present lookup, send Present UUIDs */
2569                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2570                                 LDAP_SUCCESS ) {
2571                                 if ( ctxcsn )
2572                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2573                                 if ( sids )
2574                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2575                                 goto bailout;
2576                         }
2577                 }
2578         } else {
2579                 /* No consumer state, assume something has changed */
2580                 changed = SS_CHANGED;
2581         }
2582
2583 shortcut:
2584         /* Append CSN range to search filter, save original filter
2585          * for persistent search evaluation
2586          */
2587         if ( sop ) {
2588                 sop->s_filterstr= op->ors_filterstr;
2589         }
2590
2591         /* If something changed, find the changes */
2592         if ( gotstate && changed ) {
2593                 Filter *fand, *fava;
2594
2595                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2596                 fand->f_choice = LDAP_FILTER_AND;
2597                 fand->f_next = NULL;
2598                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2599                 fand->f_and = fava;
2600                 fava->f_choice = LDAP_FILTER_GE;
2601                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2602                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2603 #ifdef LDAP_COMP_MATCH
2604                 fava->f_ava->aa_cf = NULL;
2605 #endif
2606                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2607                 fava->f_next = op->ors_filter;
2608                 op->ors_filter = fand;
2609                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2610                 if ( sop )
2611                         sop->s_flags |= PS_FIX_FILTER;
2612         }
2613
2614         /* Let our callback add needed info to returned entries */
2615         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2616         ss = (searchstate *)(cb+1);
2617         ss->ss_on = on;
2618         ss->ss_so = sop;
2619         ss->ss_flags = do_present | changed;
2620         ss->ss_ctxcsn = ctxcsn;
2621         ss->ss_numcsns = numcsns;
2622         ss->ss_sids = sids;
2623         cb->sc_response = syncprov_search_response;
2624         cb->sc_cleanup = syncprov_search_cleanup;
2625         cb->sc_private = ss;
2626         cb->sc_next = op->o_callback;
2627         op->o_callback = cb;
2628
2629         /* If this is a persistent search and no changes were reported during
2630          * the refresh phase, just invoke the response callback to transition
2631          * us into persist phase
2632          */
2633         if ( !changed ) {
2634                 rs->sr_err = LDAP_SUCCESS;
2635                 rs->sr_nentries = 0;
2636                 send_ldap_result( op, rs );
2637                 return rs->sr_err;
2638         }
2639         return SLAP_CB_CONTINUE;
2640 }
2641
2642 static int
2643 syncprov_operational(
2644         Operation *op,
2645         SlapReply *rs )
2646 {
2647         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2648         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2649
2650         /* This prevents generating unnecessarily; frontend will strip
2651          * any statically stored copy.
2652          */
2653         if ( op->o_sync != SLAP_CONTROL_NONE )
2654                 return SLAP_CB_CONTINUE;
2655
2656         if ( rs->sr_entry &&
2657                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2658
2659                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2660                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2661                         Attribute *a, **ap = NULL;
2662
2663                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2664                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2665                                         break;
2666                         }
2667
2668                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2669                         if ( si->si_ctxcsn ) {
2670                                 if ( !a ) {
2671                                         for ( ap = &rs->sr_operational_attrs; *ap;
2672                                                 ap=&(*ap)->a_next );
2673
2674                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2675                                         *ap = a;
2676                                 }
2677
2678                                 if ( !ap ) {
2679                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2680                                                 Entry *e = entry_dup( rs->sr_entry );
2681                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2682                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2683                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2684                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2685                                                         entry_free( rs->sr_entry );
2686                                                 }
2687                                                 rs->sr_entry = e;
2688                                                 rs->sr_flags |=
2689                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2690                                                 a = attr_find( rs->sr_entry->e_attrs,
2691                                                         slap_schema.si_ad_contextCSN );
2692                                         }
2693                                         if ( a->a_nvals != a->a_vals ) {
2694                                                 ber_bvarray_free( a->a_nvals );
2695                                         }
2696                                         a->a_nvals = NULL;
2697                                         ber_bvarray_free( a->a_vals );
2698                                         a->a_vals = NULL;
2699                                         a->a_numvals = 0;
2700                                 }
2701                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2702                         }
2703                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2704                 }
2705         }
2706         return SLAP_CB_CONTINUE;
2707 }
2708
2709 enum {
2710         SP_CHKPT = 1,
2711         SP_SESSL,
2712         SP_NOPRES,
2713         SP_USEHINT
2714 };
2715
2716 static ConfigDriver sp_cf_gen;
2717
2718 static ConfigTable spcfg[] = {
2719         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2720                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2721                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2722                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2723         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2724                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2725                         "DESC 'Session log size in ops' "
2726                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2727         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2728                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2729                         "DESC 'Omit Present phase processing' "
2730                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2731         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2732                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2733                         "DESC 'Observe Reload Hint in Request control' "
2734                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2735         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2736 };
2737
2738 static ConfigOCs spocs[] = {
2739         { "( OLcfgOvOc:1.1 "
2740                 "NAME 'olcSyncProvConfig' "
2741                 "DESC 'SyncRepl Provider configuration' "
2742                 "SUP olcOverlayConfig "
2743                 "MAY ( olcSpCheckpoint "
2744                         "$ olcSpSessionlog "
2745                         "$ olcSpNoPresent "
2746                         "$ olcSpReloadHint "
2747                 ") )",
2748                         Cft_Overlay, spcfg },
2749         { NULL, 0, NULL }
2750 };
2751
2752 static int
2753 sp_cf_gen(ConfigArgs *c)
2754 {
2755         slap_overinst           *on = (slap_overinst *)c->bi;
2756         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2757         int rc = 0;
2758
2759         if ( c->op == SLAP_CONFIG_EMIT ) {
2760                 switch ( c->type ) {
2761                 case SP_CHKPT:
2762                         if ( si->si_chkops || si->si_chktime ) {
2763                                 struct berval bv;
2764                                 /* we assume si_chktime is a multiple of 60
2765                                  * because the parsed value was originally
2766                                  * multiplied by 60 */
2767                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2768                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2769                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2770                                         rc = 1;
2771                                 } else {
2772                                         bv.bv_val = c->cr_msg;
2773                                         value_add_one( &c->rvalue_vals, &bv );
2774                                 }
2775                         } else {
2776                                 rc = 1;
2777                         }
2778                         break;
2779                 case SP_SESSL:
2780                         if ( si->si_logs ) {
2781                                 c->value_int = si->si_logs->sl_size;
2782                         } else {
2783                                 rc = 1;
2784                         }
2785                         break;
2786                 case SP_NOPRES:
2787                         if ( si->si_nopres ) {
2788                                 c->value_int = 1;
2789                         } else {
2790                                 rc = 1;
2791                         }
2792                         break;
2793                 case SP_USEHINT:
2794                         if ( si->si_usehint ) {
2795                                 c->value_int = 1;
2796                         } else {
2797                                 rc = 1;
2798                         }
2799                         break;
2800                 }
2801                 return rc;
2802         } else if ( c->op == LDAP_MOD_DELETE ) {
2803                 switch ( c->type ) {
2804                 case SP_CHKPT:
2805                         si->si_chkops = 0;
2806                         si->si_chktime = 0;
2807                         break;
2808                 case SP_SESSL:
2809                         if ( si->si_logs )
2810                                 si->si_logs->sl_size = 0;
2811                         else
2812                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2813                         break;
2814                 case SP_NOPRES:
2815                         if ( si->si_nopres )
2816                                 si->si_nopres = 0;
2817                         else
2818                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2819                         break;
2820                 case SP_USEHINT:
2821                         if ( si->si_usehint )
2822                                 si->si_usehint = 0;
2823                         else
2824                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2825                         break;
2826                 }
2827                 return rc;
2828         }
2829         switch ( c->type ) {
2830         case SP_CHKPT:
2831                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2832                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2833                                 c->argv[0], c->argv[1] );
2834                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2835                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2836                         return ARG_BAD_CONF;
2837                 }
2838                 if ( si->si_chkops <= 0 ) {
2839                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2840                                 c->argv[0], si->si_chkops );
2841                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2842                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2843                         return ARG_BAD_CONF;
2844                 }
2845                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2846                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2847                                 c->argv[0], c->argv[1] );
2848                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2849                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2850                         return ARG_BAD_CONF;
2851                 }
2852                 if ( si->si_chktime <= 0 ) {
2853                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2854                                 c->argv[0], si->si_chkops );
2855                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2856                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2857                         return ARG_BAD_CONF;
2858                 }
2859                 si->si_chktime *= 60;
2860                 break;
2861         case SP_SESSL: {
2862                 sessionlog *sl;
2863                 int size = c->value_int;
2864
2865                 if ( size < 0 ) {
2866                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2867                                 c->argv[0], size );
2868                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2869                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2870                         return ARG_BAD_CONF;
2871                 }
2872                 sl = si->si_logs;
2873                 if ( !sl ) {
2874                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_PVT_CSNSTR_BUFSIZE );
2875                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2876                         sl->sl_mincsn.bv_len = 0;
2877                         sl->sl_num = 0;
2878                         sl->sl_head = sl->sl_tail = NULL;
2879                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2880                         si->si_logs = sl;
2881                 }
2882                 sl->sl_size = size;
2883                 }
2884                 break;
2885         case SP_NOPRES:
2886                 si->si_nopres = c->value_int;
2887                 break;
2888         case SP_USEHINT:
2889                 si->si_usehint = c->value_int;
2890                 break;
2891         }
2892         return rc;
2893 }
2894
2895 /* ITS#3456 we cannot run this search on the main thread, must use a
2896  * child thread in order to insure we have a big enough stack.
2897  */
2898 static void *
2899 syncprov_db_otask(
2900         void *ptr
2901 )
2902 {
2903         syncprov_findcsn( ptr, FIND_MAXCSN );
2904         return NULL;
2905 }
2906
2907 /* Read any existing contextCSN from the underlying db.
2908  * Then search for any entries newer than that. If no value exists,
2909  * just generate it. Cache whatever result.
2910  */
2911 static int
2912 syncprov_db_open(
2913         BackendDB *be,
2914         ConfigReply *cr
2915 )
2916 {
2917         slap_overinst   *on = (slap_overinst *) be->bd_info;
2918         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2919
2920         Connection conn = { 0 };
2921         OperationBuffer opbuf;
2922         Operation *op;
2923         Entry *e = NULL;
2924         Attribute *a;
2925         int rc;
2926         void *thrctx = NULL;
2927
2928         if ( !SLAP_LASTMOD( be )) {
2929                 Debug( LDAP_DEBUG_ANY,
2930                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2931                 return -1;
2932         }
2933
2934         if ( slapMode & SLAP_TOOL_MODE ) {
2935                 return 0;
2936         }
2937
2938         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2939         if ( rc ) {
2940                 return rc;
2941         }
2942
2943         thrctx = ldap_pvt_thread_pool_context();
2944         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2945         op = &opbuf.ob_op;
2946         op->o_bd = be;
2947         op->o_dn = be->be_rootdn;
2948         op->o_ndn = be->be_rootndn;
2949
2950         if ( SLAP_SYNC_SUBENTRY( be )) {
2951                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2952                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2953         } else {
2954                 si->si_contextdn = be->be_nsuffix[0];
2955         }
2956         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2957                 slap_schema.si_ad_contextCSN, 0, &e, on );
2958
2959         if ( e ) {
2960                 ldap_pvt_thread_t tid;
2961
2962                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2963                 if ( a ) {
2964                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2965                         si->si_numcsns = a->a_numvals;
2966                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2967                 }
2968                 overlay_entry_release_ov( op, e, 0, on );
2969                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2970                         op->o_req_dn = be->be_suffix[0];
2971                         op->o_req_ndn = be->be_nsuffix[0];
2972                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2973                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2974                         ldap_pvt_thread_join( tid, NULL );
2975                 }
2976         }
2977
2978         /* Didn't find a contextCSN, should we generate one? */
2979         if ( !si->si_ctxcsn ) {
2980                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
2981                 struct berval csn;
2982
2983                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2984                 /* If we're also a consumer, then don't generate anything.
2985                  * Wait for our provider to send it to us, or for a local
2986                  * modify if we have multimaster.
2987                  */
2988                         goto out;
2989                 }
2990                 csn.bv_val = csnbuf;
2991                 csn.bv_len = sizeof( csnbuf );
2992                 slap_get_csn( op, &csn, 0 );
2993                 value_add_one( &si->si_ctxcsn, &csn );
2994                 si->si_numcsns = 1;
2995                 si->si_sids = ch_malloc( sizeof(int) );
2996                 si->si_sids[0] = slap_serverID;
2997
2998                 /* make sure we do a checkpoint on close */
2999                 si->si_numops++;
3000         }
3001
3002 out:
3003         op->o_bd->bd_info = (BackendInfo *)on;
3004         return 0;
3005 }
3006
3007 /* Write the current contextCSN into the underlying db.
3008  */
3009 static int
3010 syncprov_db_close(
3011         BackendDB *be,
3012         ConfigReply *cr
3013 )
3014 {
3015     slap_overinst   *on = (slap_overinst *) be->bd_info;
3016     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3017
3018         if ( slapMode & SLAP_TOOL_MODE ) {
3019                 return 0;
3020         }
3021         if ( si->si_numops ) {
3022                 Connection conn = {0};
3023                 OperationBuffer opbuf;
3024                 Operation *op;
3025                 SlapReply rs = {REP_RESULT};
3026                 void *thrctx;
3027
3028                 thrctx = ldap_pvt_thread_pool_context();
3029                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3030                 op = &opbuf.ob_op;
3031                 op->o_bd = be;
3032                 op->o_dn = be->be_rootdn;
3033                 op->o_ndn = be->be_rootndn;
3034                 syncprov_checkpoint( op, &rs, on );
3035         }
3036
3037     return 0;
3038 }
3039
3040 static int
3041 syncprov_db_init(
3042         BackendDB *be,
3043         ConfigReply *cr
3044 )
3045 {
3046         slap_overinst   *on = (slap_overinst *)be->bd_info;
3047         syncprov_info_t *si;
3048
3049         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3050                 Debug( LDAP_DEBUG_ANY,
3051                         "syncprov must be instantiated within a database.\n",
3052                         0, 0, 0 );
3053                 return 1;
3054         }
3055
3056         si = ch_calloc(1, sizeof(syncprov_info_t));
3057         on->on_bi.bi_private = si;
3058         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3059         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3060         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3061         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3062
3063         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3064         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3065         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3066         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3067
3068         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3069         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3070
3071         return 0;
3072 }
3073
3074 static int
3075 syncprov_db_destroy(
3076         BackendDB *be,
3077         ConfigReply *cr
3078 )
3079 {
3080         slap_overinst   *on = (slap_overinst *)be->bd_info;
3081         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3082
3083         if ( si ) {
3084                 if ( si->si_logs ) {
3085                         slog_entry *se = si->si_logs->sl_head;
3086
3087                         while ( se ) {
3088                                 slog_entry *se_next = se->se_next;
3089                                 ch_free( se );
3090                                 se = se_next;
3091                         }
3092
3093                         ch_free( si->si_logs );
3094                 }
3095                 if ( si->si_ctxcsn )
3096                         ber_bvarray_free( si->si_ctxcsn );
3097                 if ( si->si_sids )
3098                         ch_free( si->si_sids );
3099                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3100                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3101                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3102                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3103                 ch_free( si );
3104         }
3105
3106         return 0;
3107 }
3108
3109 static int syncprov_parseCtrl (
3110         Operation *op,
3111         SlapReply *rs,
3112         LDAPControl *ctrl )
3113 {
3114         ber_tag_t tag;
3115         BerElementBuffer berbuf;
3116         BerElement *ber = (BerElement *)&berbuf;
3117         ber_int_t mode;
3118         ber_len_t len;
3119         struct berval cookie = BER_BVNULL;
3120         sync_control *sr;
3121         int rhint = 0;
3122
3123         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3124                 rs->sr_text = "Sync control specified multiple times";
3125                 return LDAP_PROTOCOL_ERROR;
3126         }
3127
3128         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3129                 rs->sr_text = "Sync control specified with pagedResults control";
3130                 return LDAP_PROTOCOL_ERROR;
3131         }
3132
3133         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3134                 rs->sr_text = "Sync control value is absent";
3135                 return LDAP_PROTOCOL_ERROR;
3136         }
3137
3138         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3139                 rs->sr_text = "Sync control value is empty";
3140                 return LDAP_PROTOCOL_ERROR;
3141         }
3142
3143         /* Parse the control value
3144          *      syncRequestValue ::= SEQUENCE {
3145          *              mode   ENUMERATED {
3146          *                      -- 0 unused
3147          *                      refreshOnly             (1),
3148          *                      -- 2 reserved
3149          *                      refreshAndPersist       (3)
3150          *              },
3151          *              cookie  syncCookie OPTIONAL
3152          *      }
3153          */
3154
3155         ber_init2( ber, &ctrl->ldctl_value, 0 );
3156
3157         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3158                 rs->sr_text = "Sync control : mode decoding error";
3159                 return LDAP_PROTOCOL_ERROR;
3160         }
3161
3162         switch( mode ) {
3163         case LDAP_SYNC_REFRESH_ONLY:
3164                 mode = SLAP_SYNC_REFRESH;
3165                 break;
3166         case LDAP_SYNC_REFRESH_AND_PERSIST:
3167                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3168                 break;
3169         default:
3170                 rs->sr_text = "Sync control : unknown update mode";
3171                 return LDAP_PROTOCOL_ERROR;
3172         }
3173
3174         tag = ber_peek_tag( ber, &len );
3175
3176         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3177                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3178                         rs->sr_text = "Sync control : cookie decoding error";
3179                         return LDAP_PROTOCOL_ERROR;
3180                 }
3181                 tag = ber_peek_tag( ber, &len );
3182         }
3183         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3184                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3185                         rs->sr_text = "Sync control : rhint decoding error";
3186                         return LDAP_PROTOCOL_ERROR;
3187                 }
3188         }
3189         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3190                         rs->sr_text = "Sync control : decoding error";
3191                         return LDAP_PROTOCOL_ERROR;
3192         }
3193         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3194         sr->sr_rhint = rhint;
3195         if (!BER_BVISNULL(&cookie)) {
3196                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3197                 /* If parse fails, pretend no cookie was sent */
3198                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3199                         sr->sr_state.rid == -1 ) {
3200                         if ( sr->sr_state.ctxcsn ) {
3201                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3202                                 sr->sr_state.ctxcsn = NULL;
3203                         }
3204                         sr->sr_state.numcsns = 0;
3205                 }
3206         }
3207
3208         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3209
3210         op->o_sync = ctrl->ldctl_iscritical
3211                 ? SLAP_CONTROL_CRITICAL
3212                 : SLAP_CONTROL_NONCRITICAL;
3213
3214         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3215
3216         return LDAP_SUCCESS;
3217 }
3218
3219 /* This overlay is set up for dynamic loading via moduleload. For static
3220  * configuration, you'll need to arrange for the slap_overinst to be
3221  * initialized and registered by some other function inside slapd.
3222  */
3223
3224 static slap_overinst            syncprov;
3225
3226 int
3227 syncprov_initialize()
3228 {
3229         int rc;
3230
3231         rc = register_supported_control( LDAP_CONTROL_SYNC,
3232                 SLAP_CTRL_SEARCH, NULL,
3233                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3234         if ( rc != LDAP_SUCCESS ) {
3235                 Debug( LDAP_DEBUG_ANY,
3236                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3237                 return rc;
3238         }
3239
3240         syncprov.on_bi.bi_type = "syncprov";
3241         syncprov.on_bi.bi_db_init = syncprov_db_init;
3242         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3243         syncprov.on_bi.bi_db_open = syncprov_db_open;
3244         syncprov.on_bi.bi_db_close = syncprov_db_close;
3245
3246         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3247         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3248
3249         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3250         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3251         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3252         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3253         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3254         syncprov.on_bi.bi_op_search = syncprov_op_search;
3255         syncprov.on_bi.bi_extended = syncprov_op_extended;
3256         syncprov.on_bi.bi_operational = syncprov_operational;
3257
3258         syncprov.on_bi.bi_cf_ocs = spocs;
3259
3260         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3261
3262         rc = config_register_schema( spcfg, spocs );
3263         if ( rc ) return rc;
3264
3265         return overlay_register( &syncprov );
3266 }
3267
3268 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3269 int
3270 init_module( int argc, char *argv[] )
3271 {
3272         return syncprov_initialize();
3273 }
3274 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3275
3276 #endif /* defined(SLAPD_OVER_SYNCPROV) */