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 2004-2007 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 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68 #define PS_FIX_FILTER           0x10
  69
  70         int             s_inuse;        /* reference count */
  71         struct syncres *s_res;
  72         struct syncres *s_restail;
  73         struct re_s     *s_qtask;       /* task for playing psearch responses */
  74 #define RUNQ_INTERVAL   36000   /* a long time */
  75         ldap_pvt_thread_mutex_t s_mutex;
  76 } syncops;
  77
  78 /* A received sync control */
  79 typedef struct sync_control {
  80         struct sync_cookie sr_state;
  81         int sr_rhint;
  82 } sync_control;
  83
  84 #if 0 /* moved back to slap.h */
  85 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  86 #endif
  87 /* o_sync_mode uses data bits of o_sync */
  88 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  89
  90 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  94
  95 /* Record of which searches matched at premodify step */
  96 typedef struct syncmatches {
  97         struct syncmatches *sm_next;
  98         syncops *sm_op;
  99 } syncmatches;
 100
 101 /* Session log data */
 102 typedef struct slog_entry {
 103         struct slog_entry *se_next;
 104         struct berval se_uuid;
 105         struct berval se_csn;
 106         ber_tag_t       se_tag;
 107 } slog_entry;
 108
 109 typedef struct sessionlog {
 110         struct berval   sl_mincsn;
 111         int             sl_num;
 112         int             sl_size;
 113         slog_entry *sl_head;
 114         slog_entry *sl_tail;
 115         ldap_pvt_thread_mutex_t sl_mutex;
 116 } sessionlog;
 117
 118 /* The main state for this overlay */
 119 typedef struct syncprov_info_t {
 120         syncops         *si_ops;
 121         struct berval   si_ctxcsn;      /* ldapsync context */
 122         int             si_chkops;      /* checkpointing info */
 123         int             si_chktime;
 124         int             si_numops;      /* number of ops since last checkpoint */
 125         int             si_nopres;      /* Skip present phase */
 126         int             si_usehint;     /* use reload hint */
 127         time_t  si_chklast;     /* time of last checkpoint */
 128         Avlnode *si_mods;       /* entries being modified */
 129         sessionlog      *si_logs;
 130         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 131         ldap_pvt_thread_mutex_t si_ops_mutex;
 132         ldap_pvt_thread_mutex_t si_mods_mutex;
 133         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 134 } syncprov_info_t;
 135
 136 typedef struct opcookie {
 137         slap_overinst *son;
 138         syncmatches *smatches;
 139         struct berval sdn;      /* DN of entry, for deletes */
 140         struct berval sndn;
 141         struct berval suuid;    /* UUID of entry */
 142         struct berval sctxcsn;
 143         int sreference; /* Is the entry a reference? */
 144 } opcookie;
 145
 146 typedef struct fbase_cookie {
 147         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 148         syncops *fss;   /* persistent search we're testing against */
 149         int fbase;      /* if TRUE we found the search base and it's still valid */
 150         int fscope;     /* if TRUE then fdn is within the psearch scope */
 151 } fbase_cookie;
 152
 153 static AttributeName csn_anlist[3];
 154 static AttributeName uuid_anlist[2];
 155
 156 /* Build a LDAPsync intermediate state control */
 157 static int
 158 syncprov_state_ctrl(
 159         Operation       *op,
 160         SlapReply       *rs,
 161         Entry           *e,
 162         int             entry_sync_state,
 163         LDAPControl     **ctrls,
 164         int             num_ctrls,
 165         int             send_cookie,
 166         struct berval   *cookie )
 167 {
 168         Attribute* a;
 169         int ret;
 170
 171         BerElementBuffer berbuf;
 172         BerElement *ber = (BerElement *)&berbuf;
 173
 174         struct berval   entryuuid_bv = BER_BVNULL;
 175
 176         ber_init2( ber, 0, LBER_USE_DER );
 177         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 178
 179         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 180
 181         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 182                 AttributeDescription *desc = a->a_desc;
 183                 if ( desc == slap_schema.si_ad_entryUUID ) {
 184                         entryuuid_bv = a->a_nvals[0];
 185                         break;
 186                 }
 187         }
 188
 189         /* FIXME: what if entryuuid is NULL or empty ? */
 190
 191         if ( send_cookie && cookie ) {
 192                 ber_printf( ber, "{eOON}",
 193                         entry_sync_state, &entryuuid_bv, cookie );
 194         } else {
 195                 ber_printf( ber, "{eON}",
 196                         entry_sync_state, &entryuuid_bv );
 197         }
 198
 199         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 200         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 201         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 202
 203         ber_free_buf( ber );
 204
 205         if ( ret < 0 ) {
 206                 Debug( LDAP_DEBUG_TRACE,
 207                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 208                         0, 0, 0 );
 209                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 210                 return ret;
 211         }
 212
 213         return LDAP_SUCCESS;
 214 }
 215
 216 /* Build a LDAPsync final state control */
 217 static int
 218 syncprov_done_ctrl(
 219         Operation       *op,
 220         SlapReply       *rs,
 221         LDAPControl     **ctrls,
 222         int                     num_ctrls,
 223         int                     send_cookie,
 224         struct berval *cookie,
 225         int                     refreshDeletes )
 226 {
 227         int ret;
 228         BerElementBuffer berbuf;
 229         BerElement *ber = (BerElement *)&berbuf;
 230
 231         ber_init2( ber, NULL, LBER_USE_DER );
 232         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 233
 234         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 235
 236         ber_printf( ber, "{" );
 237         if ( send_cookie && cookie ) {
 238                 ber_printf( ber, "O", cookie );
 239         }
 240         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 241                 ber_printf( ber, "b", refreshDeletes );
 242         }
 243         ber_printf( ber, "N}" );
 244
 245         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 246         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 247         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 248
 249         ber_free_buf( ber );
 250
 251         if ( ret < 0 ) {
 252                 Debug( LDAP_DEBUG_TRACE,
 253                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 254                         0, 0, 0 );
 255                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 256                 return ret;
 257         }
 258
 259         return LDAP_SUCCESS;
 260 }
 261
 262 static int
 263 syncprov_sendinfo(
 264         Operation       *op,
 265         SlapReply       *rs,
 266         int                     type,
 267         struct berval *cookie,
 268         int                     refreshDone,
 269         BerVarray       syncUUIDs,
 270         int                     refreshDeletes )
 271 {
 272         BerElementBuffer berbuf;
 273         BerElement *ber = (BerElement *)&berbuf;
 274         struct berval rspdata;
 275
 276         int ret;
 277
 278         ber_init2( ber, NULL, LBER_USE_DER );
 279         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 280
 281         if ( type ) {
 282                 switch ( type ) {
 283                 case LDAP_TAG_SYNC_NEW_COOKIE:
 284                         ber_printf( ber, "tO", type, cookie );
 285                         break;
 286                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 287                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 288                         ber_printf( ber, "t{", type );
 289                         if ( cookie ) {
 290                                 ber_printf( ber, "O", cookie );
 291                         }
 292                         if ( refreshDone == 0 ) {
 293                                 ber_printf( ber, "b", refreshDone );
 294                         }
 295                         ber_printf( ber, "N}" );
 296                         break;
 297                 case LDAP_TAG_SYNC_ID_SET:
 298                         ber_printf( ber, "t{", type );
 299                         if ( cookie ) {
 300                                 ber_printf( ber, "O", cookie );
 301                         }
 302                         if ( refreshDeletes == 1 ) {
 303                                 ber_printf( ber, "b", refreshDeletes );
 304                         }
 305                         ber_printf( ber, "[W]", syncUUIDs );
 306                         ber_printf( ber, "N}" );
 307                         break;
 308                 default:
 309                         Debug( LDAP_DEBUG_TRACE,
 310                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 311                                 type, 0, 0 );
 312                         return LDAP_OTHER;
 313                 }
 314         }
 315
 316         ret = ber_flatten2( ber, &rspdata, 0 );
 317
 318         if ( ret < 0 ) {
 319                 Debug( LDAP_DEBUG_TRACE,
 320                         "syncprov_sendinfo: ber_flatten2 failed\n",
 321                         0, 0, 0 );
 322                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 323                 return ret;
 324         }
 325
 326         rs->sr_rspoid = LDAP_SYNC_INFO;
 327         rs->sr_rspdata = &rspdata;
 328         send_ldap_intermediate( op, rs );
 329         rs->sr_rspdata = NULL;
 330         ber_free_buf( ber );
 331
 332         return LDAP_SUCCESS;
 333 }
 334
 335 /* Find a modtarget in an AVL tree */
 336 static int
 337 sp_avl_cmp( const void *c1, const void *c2 )
 338 {
 339         const modtarget *m1, *m2;
 340         int rc;
 341
 342         m1 = c1; m2 = c2;
 343         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 344
 345         if ( rc ) return rc;
 346         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 347 }
 348
 349 /* syncprov_findbase:
 350  *   finds the true DN of the base of a search (with alias dereferencing) and
 351  * checks to make sure the base entry doesn't get replaced with a different
 352  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 353  * change is detected, any persistent search on this base must be terminated /
 354  * reloaded.
 355  *   On the first call, we just save the DN and entryID. On subsequent calls
 356  * we compare the DN and entryID with the saved values.
 357  */
 358 static int
 359 findbase_cb( Operation *op, SlapReply *rs )
 360 {
 361         slap_callback *sc = op->o_callback;
 362
 363         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 364                 fbase_cookie *fc = sc->sc_private;
 365
 366                 /* If no entryID, we're looking for the first time.
 367                  * Just store whatever we got.
 368                  */
 369                 if ( fc->fss->s_eid == NOID ) {
 370                         fc->fbase = 2;
 371                         fc->fss->s_eid = rs->sr_entry->e_id;
 372                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 373
 374                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 375                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 376
 377                 /* OK, the DN is the same and the entryID is the same. */
 378                         fc->fbase = 1;
 379                 }
 380         }
 381         if ( rs->sr_err != LDAP_SUCCESS ) {
 382                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 383         }
 384         return LDAP_SUCCESS;
 385 }
 386
 387 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 388 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 389
 390 static int
 391 syncprov_findbase( Operation *op, fbase_cookie *fc )
 392 {
 393         opcookie *opc = op->o_callback->sc_private;
 394         slap_overinst *on = opc->son;
 395
 396         /* Use basic parameters from syncrepl search, but use
 397          * current op's threadctx / tmpmemctx
 398          */
 399         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 400         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 401                 slap_callback cb = {0};
 402                 Operation fop;
 403                 SlapReply frs = { REP_RESULT };
 404                 int rc;
 405
 406                 fc->fss->s_flags ^= PS_FIND_BASE;
 407                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 408
 409                 fop = *fc->fss->s_op;
 410
 411                 fop.o_hdr = op->o_hdr;
 412                 fop.o_bd = op->o_bd;
 413                 fop.o_time = op->o_time;
 414                 fop.o_tincr = op->o_tincr;
 415
 416                 cb.sc_response = findbase_cb;
 417                 cb.sc_private = fc;
 418
 419                 fop.o_sync_mode = 0;    /* turn off sync mode */
 420                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 421                 fop.o_callback = &cb;
 422                 fop.o_tag = LDAP_REQ_SEARCH;
 423                 fop.ors_scope = LDAP_SCOPE_BASE;
 424                 fop.ors_limit = NULL;
 425                 fop.ors_slimit = 1;
 426                 fop.ors_tlimit = SLAP_NO_LIMIT;
 427                 fop.ors_attrs = slap_anlist_no_attrs;
 428                 fop.ors_attrsonly = 1;
 429                 fop.ors_filter = &generic_filter;
 430                 fop.ors_filterstr = generic_filterstr;
 431
 432                 fop.o_bd->bd_info = on->on_info->oi_orig;
 433                 rc = fop.o_bd->be_search( &fop, &frs );
 434                 fop.o_bd->bd_info = (BackendInfo *)on;
 435         } else {
 436                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 437                 fc->fbase = 1;
 438         }
 439
 440         /* After the first call, see if the fdn resides in the scope */
 441         if ( fc->fbase == 1 ) {
 442                 switch ( fc->fss->s_op->ors_scope ) {
 443                 case LDAP_SCOPE_BASE:
 444                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 445                         break;
 446                 case LDAP_SCOPE_ONELEVEL: {
 447                         struct berval pdn;
 448                         dnParent( fc->fdn, &pdn );
 449                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 450                         break; }
 451                 case LDAP_SCOPE_SUBTREE:
 452                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 453                         break;
 454                 case LDAP_SCOPE_SUBORDINATE:
 455                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 456                                 !dn_match( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 }
 459         }
 460
 461         if ( fc->fbase )
 462                 return LDAP_SUCCESS;
 463
 464         /* If entryID has changed, then the base of this search has
 465          * changed. Invalidate the psearch.
 466          */
 467         return LDAP_NO_SUCH_OBJECT;
 468 }
 469
 470 /* syncprov_findcsn:
 471  *   This function has three different purposes, but they all use a search
 472  * that filters on entryCSN so they're combined here.
 473  * 1: at startup time, after a contextCSN has been read from the database,
 474  * we search for all entries with CSN >= contextCSN in case the contextCSN
 475  * was not checkpointed at the previous shutdown.
 476  *
 477  * 2: when the current contextCSN is known and we have a sync cookie, we search
 478  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 479  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 480  *
 481  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 482  * CSN, and generate Present records for them. We always collect this result
 483  * in SyncID sets, even if there's only one match.
 484  */
 485 typedef enum find_csn_t {
 486         FIND_MAXCSN     = 1,
 487         FIND_CSN        = 2,
 488         FIND_PRESENT    = 3
 489 } find_csn_t;
 490
 491 static int
 492 findmax_cb( Operation *op, SlapReply *rs )
 493 {
 494         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 495                 struct berval *maxcsn = op->o_callback->sc_private;
 496                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 497                         slap_schema.si_ad_entryCSN );
 498
 499                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 500                         maxcsn->bv_len = a->a_vals[0].bv_len;
 501                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 502                 }
 503         }
 504         return LDAP_SUCCESS;
 505 }
 506
 507 static int
 508 findcsn_cb( Operation *op, SlapReply *rs )
 509 {
 510         slap_callback *sc = op->o_callback;
 511
 512         /* We just want to know that at least one exists, so it's OK if
 513          * we exceed the unchecked limit.
 514          */
 515         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 516                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 517                 sc->sc_private = (void *)1;
 518         }
 519         return LDAP_SUCCESS;
 520 }
 521
 522 /* Build a list of entryUUIDs for sending in a SyncID set */
 523
 524 #define UUID_LEN        16
 525
 526 typedef struct fpres_cookie {
 527         int num;
 528         BerVarray uuids;
 529         char *last;
 530 } fpres_cookie;
 531
 532 static int
 533 findpres_cb( Operation *op, SlapReply *rs )
 534 {
 535         slap_callback *sc = op->o_callback;
 536         fpres_cookie *pc = sc->sc_private;
 537         Attribute *a;
 538         int ret = SLAP_CB_CONTINUE;
 539
 540         switch ( rs->sr_type ) {
 541         case REP_SEARCH:
 542                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 543                 if ( a ) {
 544                         pc->uuids[pc->num].bv_val = pc->last;
 545                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 546                                 pc->uuids[pc->num].bv_len );
 547                         pc->num++;
 548                         pc->last = pc->uuids[pc->num].bv_val;
 549                         pc->uuids[pc->num].bv_val = NULL;
 550                 }
 551                 ret = LDAP_SUCCESS;
 552                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 553                         break;
 554                 /* FALLTHRU */
 555         case REP_RESULT:
 556                 ret = rs->sr_err;
 557                 if ( pc->num ) {
 558                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 559                                 0, pc->uuids, 0 );
 560                         pc->uuids[pc->num].bv_val = pc->last;
 561                         pc->num = 0;
 562                         pc->last = pc->uuids[0].bv_val;
 563                 }
 564                 break;
 565         default:
 566                 break;
 567         }
 568         return ret;
 569 }
 570
 571 static int
 572 syncprov_findcsn( Operation *op, find_csn_t mode )
 573 {
 574         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 575         syncprov_info_t         *si = on->on_bi.bi_private;
 576
 577         slap_callback cb = {0};
 578         Operation fop;
 579         SlapReply frs = { REP_RESULT };
 580         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 581         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 582         struct berval maxcsn;
 583         Filter cf;
 584 #ifdef LDAP_COMP_MATCH
 585         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 586 #else
 587         AttributeAssertion eq = { NULL, BER_BVNULL };
 588 #endif
 589         fpres_cookie pcookie;
 590         sync_control *srs = NULL;
 591         struct slap_limits_set fc_limits;
 592         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 593
 594         if ( mode != FIND_MAXCSN ) {
 595                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 596
 597                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 598                         return LDAP_OTHER;
 599                 }
 600         }
 601
 602         fop = *op;
 603         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 604         /* We want pure entries, not referrals */
 605         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 606
 607         cf.f_ava = &eq;
 608         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 609         cf.f_next = NULL;
 610
 611         fop.o_callback = &cb;
 612         fop.ors_limit = NULL;
 613         fop.ors_tlimit = SLAP_NO_LIMIT;
 614         fop.ors_filter = &cf;
 615         fop.ors_filterstr.bv_val = buf;
 616
 617 again:
 618         switch( mode ) {
 619         case FIND_MAXCSN:
 620                 cf.f_choice = LDAP_FILTER_GE;
 621                 cf.f_av_value = si->si_ctxcsn;
 622                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 623                         cf.f_av_value.bv_val );
 624                 fop.ors_attrsonly = 0;
 625                 fop.ors_attrs = csn_anlist;
 626                 fop.ors_slimit = SLAP_NO_LIMIT;
 627                 cb.sc_private = &maxcsn;
 628                 cb.sc_response = findmax_cb;
 629                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 630                 maxcsn.bv_val = cbuf;
 631                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 632                 break;
 633         case FIND_CSN:
 634                 cf.f_av_value = srs->sr_state.ctxcsn;
 635                 /* Look for exact match the first time */
 636                 if ( findcsn_retry ) {
 637                         cf.f_choice = LDAP_FILTER_EQUALITY;
 638                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 639                                 cf.f_av_value.bv_val );
 640                 /* On retry, look for <= */
 641                 } else {
 642                         cf.f_choice = LDAP_FILTER_LE;
 643                         fop.ors_limit = &fc_limits;
 644                         fc_limits.lms_s_unchecked = 1;
 645                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 646                                 cf.f_av_value.bv_val );
 647                 }
 648                 fop.ors_attrsonly = 1;
 649                 fop.ors_attrs = slap_anlist_no_attrs;
 650                 fop.ors_slimit = 1;
 651                 cb.sc_private = NULL;
 652                 cb.sc_response = findcsn_cb;
 653                 break;
 654         case FIND_PRESENT:
 655                 fop.ors_filter = op->ors_filter;
 656                 fop.ors_filterstr = op->ors_filterstr;
 657                 fop.ors_attrsonly = 0;
 658                 fop.ors_attrs = uuid_anlist;
 659                 fop.ors_slimit = SLAP_NO_LIMIT;
 660                 cb.sc_private = &pcookie;
 661                 cb.sc_response = findpres_cb;
 662                 pcookie.num = 0;
 663
 664                 /* preallocate storage for a full set */
 665                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 666                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 667                         op->o_tmpmemctx );
 668                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 669                 pcookie.uuids[0].bv_val = pcookie.last;
 670                 pcookie.uuids[0].bv_len = UUID_LEN;
 671                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 672                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 673                         pcookie.uuids[i].bv_len = UUID_LEN;
 674                 }
 675                 break;
 676         }
 677
 678         fop.o_bd->bd_info = on->on_info->oi_orig;
 679         fop.o_bd->be_search( &fop, &frs );
 680         fop.o_bd->bd_info = (BackendInfo *)on;
 681
 682         switch( mode ) {
 683         case FIND_MAXCSN:
 684                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 685                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 686                 break;
 687         case FIND_CSN:
 688                 /* If matching CSN was not found, invalidate the context. */
 689                 if ( !cb.sc_private ) {
 690                         /* If we didn't find an exact match, then try for <= */
 691                         if ( findcsn_retry ) {
 692                                 findcsn_retry = 0;
 693                                 goto again;
 694                         }
 695                         rc = LDAP_NO_SUCH_OBJECT;
 696                 }
 697                 break;
 698         case FIND_PRESENT:
 699                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 700                 break;
 701         }
 702
 703         return rc;
 704 }
 705
 706 static void
 707 syncprov_free_syncop( syncops *so )
 708 {
 709         syncres *sr, *srnext;
 710         GroupAssertion *ga, *gnext;
 711
 712         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 713         if ( --so->s_inuse > 0 ) {
 714                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 715                 return;
 716         }
 717         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 718         if ( so->s_flags & PS_IS_DETACHED ) {
 719                 filter_free( so->s_op->ors_filter );
 720                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 721                         gnext = ga->ga_next;
 722                         ch_free( ga );
 723                 }
 724                 ch_free( so->s_op );
 725         }
 726         ch_free( so->s_base.bv_val );
 727         for ( sr=so->s_res; sr; sr=srnext ) {
 728                 srnext = sr->s_next;
 729                 ch_free( sr );
 730         }
 731         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 732         ch_free( so );
 733 }
 734
 735 /* Send a persistent search response */
 736 static int
 737 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 738         Entry **e, int mode )
 739 {
 740         slap_overinst *on = opc->son;
 741
 742         SlapReply rs = { REP_SEARCH };
 743         LDAPControl *ctrls[2];
 744         struct berval cookie;
 745         Entry e_uuid = {0};
 746         Attribute a_uuid = {0};
 747
 748         if ( so->s_op->o_abandon )
 749                 return SLAPD_ABANDON;
 750
 751         ctrls[1] = NULL;
 752         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 753
 754         e_uuid.e_attrs = &a_uuid;
 755         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 756         a_uuid.a_nvals = &opc->suuid;
 757         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 758                 mode, ctrls, 0, 1, &cookie );
 759         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 760
 761         rs.sr_ctrls = ctrls;
 762         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 763         switch( mode ) {
 764         case LDAP_SYNC_ADD:
 765                 rs.sr_entry = *e;
 766                 if ( rs.sr_entry->e_private )
 767                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 768                 if ( opc->sreference ) {
 769                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 770                         rs.sr_err = send_search_reference( op, &rs );
 771                         ber_bvarray_free( rs.sr_ref );
 772                         if ( !rs.sr_entry )
 773                                 *e = NULL;
 774                         break;
 775                 }
 776                 /* fallthru */
 777         case LDAP_SYNC_MODIFY:
 778                 rs.sr_entry = *e;
 779                 if ( rs.sr_entry->e_private )
 780                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 781                 rs.sr_attrs = op->ors_attrs;
 782                 rs.sr_err = send_search_entry( op, &rs );
 783                 if ( !rs.sr_entry )
 784                         *e = NULL;
 785                 break;
 786         case LDAP_SYNC_DELETE:
 787                 e_uuid.e_attrs = NULL;
 788                 e_uuid.e_name = opc->sdn;
 789                 e_uuid.e_nname = opc->sndn;
 790                 rs.sr_entry = &e_uuid;
 791                 if ( opc->sreference ) {
 792                         struct berval bv = BER_BVNULL;
 793                         rs.sr_ref = &bv;
 794                         rs.sr_err = send_search_reference( op, &rs );
 795                 } else {
 796                         rs.sr_err = send_search_entry( op, &rs );
 797                 }
 798                 break;
 799         default:
 800                 assert(0);
 801         }
 802         /* In case someone else freed it already? */
 803         if ( rs.sr_ctrls ) {
 804                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 805                 rs.sr_ctrls = NULL;
 806         }
 807
 808         return rs.sr_err;
 809 }
 810
 811 /* Play back queued responses */
 812 static int
 813 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 814 {
 815         syncres *sr;
 816         Entry *e;
 817         opcookie opc;
 818         int rc = 0;
 819
 820         opc.son = on;
 821         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 822
 823         for (;;) {
 824                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 825                 sr = so->s_res;
 826                 if ( sr )
 827                         so->s_res = sr->s_next;
 828                 if ( !so->s_res )
 829                         so->s_restail = NULL;
 830                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 831
 832                 if ( !sr || so->s_op->o_abandon )
 833                         break;
 834
 835                 opc.sdn = sr->s_dn;
 836                 opc.sndn = sr->s_ndn;
 837                 opc.suuid = sr->s_uuid;
 838                 opc.sctxcsn = sr->s_csn;
 839                 opc.sreference = sr->s_isreference;
 840                 e = NULL;
 841
 842                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 843                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 844                         if ( rc ) {
 845                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 846                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 847                                 ch_free( sr );
 848                                 rc = 0;
 849                                 continue;
 850                         }
 851                 }
 852                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 853
 854                 if ( e ) {
 855                         be_entry_release_rw( op, e, 0 );
 856                 }
 857
 858                 ch_free( sr );
 859
 860                 if ( rc )
 861                         break;
 862         }
 863         op->o_bd->bd_info = (BackendInfo *)on;
 864         return rc;
 865 }
 866
 867 /* runqueue task for playing back queued responses */
 868 static void *
 869 syncprov_qtask( void *ctx, void *arg )
 870 {
 871         struct re_s *rtask = arg;
 872         syncops *so = rtask->arg;
 873         slap_overinst *on = so->s_op->o_private;
 874         OperationBuffer opbuf;
 875         Operation *op;
 876         BackendDB be;
 877         int rc;
 878
 879         op = (Operation *) &opbuf;
 880         *op = *so->s_op;
 881         op->o_hdr = (Opheader *)(op+1);
 882         op->o_controls = (void **)(op->o_hdr+1);
 883         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 884
 885         *op->o_hdr = *so->s_op->o_hdr;
 886
 887         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 888         op->o_tmpmfuncs = &slap_sl_mfuncs;
 889         op->o_threadctx = ctx;
 890
 891         /* syncprov_qplay expects a fake db */
 892         be = *so->s_op->o_bd;
 893         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 894         op->o_bd = &be;
 895         op->o_private = NULL;
 896         op->o_callback = NULL;
 897
 898         rc = syncprov_qplay( op, on, so );
 899
 900         /* decrement use count... */
 901         syncprov_free_syncop( so );
 902
 903         /* wait until we get explicitly scheduled again */
 904         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 905         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 906         if ( rc == 0 ) {
 907                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 908         } else {
 909                 /* bail out on any error */
 910                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 911         }
 912         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 913
 914         return NULL;
 915 }
 916
 917 /* Start the task to play back queued psearch responses */
 918 static void
 919 syncprov_qstart( syncops *so )
 920 {
 921         int wake=0;
 922         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 923         if ( !so->s_qtask ) {
 924                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 925                         syncprov_qtask, so, "syncprov_qtask",
 926                         so->s_op->o_conn->c_peer_name.bv_val );
 927                 ++so->s_inuse;
 928                 wake = 1;
 929         } else {
 930                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 931                         !so->s_qtask->next_sched.tv_sec ) {
 932                         so->s_qtask->interval.tv_sec = 0;
 933                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 934                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 935                         ++so->s_inuse;
 936                         wake = 1;
 937                 }
 938         }
 939         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 940         if ( wake )
 941                 slap_wake_listener();
 942 }
 943
 944 /* Queue a persistent search response */
 945 static int
 946 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 947 {
 948         syncres *sr;
 949
 950         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 951                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 952         sr->s_next = NULL;
 953         sr->s_dn.bv_val = (char *)(sr + 1);
 954         sr->s_dn.bv_len = opc->sdn.bv_len;
 955         sr->s_mode = mode;
 956         sr->s_isreference = opc->sreference;
 957         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 958                  opc->sdn.bv_val ) + 1;
 959         sr->s_ndn.bv_len = opc->sndn.bv_len;
 960         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 961                  opc->sndn.bv_val ) + 1;
 962         sr->s_uuid.bv_len = opc->suuid.bv_len;
 963         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 964         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 965         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 966         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 967
 968         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 969         if ( !so->s_res ) {
 970                 so->s_res = sr;
 971         } else {
 972                 so->s_restail->s_next = sr;
 973         }
 974         so->s_restail = sr;
 975
 976         /* If the base of the psearch was modified, check it next time round */
 977         if ( so->s_flags & PS_WROTE_BASE ) {
 978                 so->s_flags ^= PS_WROTE_BASE;
 979                 so->s_flags |= PS_FIND_BASE;
 980         }
 981         if ( so->s_flags & PS_IS_DETACHED ) {
 982                 syncprov_qstart( so );
 983         }
 984         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 985         return LDAP_SUCCESS;
 986 }
 987
 988 static int
 989 syncprov_drop_psearch( syncops *so, int lock )
 990 {
 991         if ( so->s_flags & PS_IS_DETACHED ) {
 992                 if ( lock )
 993                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 994                 so->s_op->o_conn->c_n_ops_executing--;
 995                 so->s_op->o_conn->c_n_ops_completed++;
 996                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 997                         o_next );
 998                 if ( lock )
 999                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1000         }
1001         syncprov_free_syncop( so );
1002
1003         return 0;
1004 }
1005
1006 static int
1007 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1008 {
1009         slap_callback *sc = op->o_callback;
1010         op->o_callback = sc->sc_next;
1011         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1012         op->o_tmpfree( sc, op->o_tmpmemctx );
1013         return 0;
1014 }
1015
1016 static int
1017 syncprov_op_abandon( Operation *op, SlapReply *rs )
1018 {
1019         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1020         syncprov_info_t         *si = on->on_bi.bi_private;
1021         syncops *so, *soprev;
1022
1023         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1024         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1025                 soprev=so, so=so->s_next ) {
1026                 if ( so->s_op->o_connid == op->o_connid &&
1027                         so->s_op->o_msgid == op->orn_msgid ) {
1028                                 so->s_op->o_abandon = 1;
1029                                 soprev->s_next = so->s_next;
1030                                 break;
1031                 }
1032         }
1033         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1034         if ( so ) {
1035                 /* Is this really a Cancel exop? */
1036                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1037                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1038                         rs->sr_err = LDAP_CANCELLED;
1039                         send_ldap_result( so->s_op, rs );
1040                         if ( so->s_flags & PS_IS_DETACHED ) {
1041                                 slap_callback *cb;
1042                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1043                                 cb->sc_cleanup = syncprov_ab_cleanup;
1044                                 cb->sc_next = op->o_callback;
1045                                 cb->sc_private = so;
1046                                 return SLAP_CB_CONTINUE;
1047                         }
1048                 }
1049                 syncprov_drop_psearch( so, 0 );
1050         }
1051         return SLAP_CB_CONTINUE;
1052 }
1053
1054 /* Find which persistent searches are affected by this operation */
1055 static void
1056 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1057 {
1058         slap_overinst *on = opc->son;
1059         syncprov_info_t         *si = on->on_bi.bi_private;
1060
1061         fbase_cookie fc;
1062         syncops *ss, *sprev, *snext;
1063         Entry *e;
1064         Attribute *a;
1065         int rc;
1066         struct berval newdn;
1067         int freefdn = 0;
1068         BackendDB *b0 = op->o_bd, db;
1069
1070         fc.fdn = &op->o_req_ndn;
1071         /* compute new DN */
1072         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1073                 struct berval pdn;
1074                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1075                 else dnParent( fc.fdn, &pdn );
1076                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1077                 fc.fdn = &newdn;
1078                 freefdn = 1;
1079         }
1080         if ( op->o_tag != LDAP_REQ_ADD ) {
1081                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1082                         db = *op->o_bd;
1083                         op->o_bd = &db;
1084                 }
1085                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1086                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1087                 /* If we're sending responses now, make a copy and unlock the DB */
1088                 if ( e && !saveit ) {
1089                         Entry *e2 = entry_dup( e );
1090                         be_entry_release_rw( op, e, 0 );
1091                         e = e2;
1092                 }
1093                 op->o_bd->bd_info = (BackendInfo *)on;
1094                 if ( rc ) {
1095                         op->o_bd = b0;
1096                         return;
1097                 }
1098         } else {
1099                 e = op->ora_e;
1100         }
1101
1102         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1103                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1104                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1105                 opc->sreference = is_entry_referral( e );
1106                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1107                 if ( a )
1108                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1109         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1110                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1111                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1112                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1113                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1114         }
1115
1116         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1117         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1118                 sprev = ss, ss=snext)
1119         {
1120                 syncmatches *sm;
1121                 int found = 0;
1122
1123                 snext = ss->s_next;
1124                 /* validate base */
1125                 fc.fss = ss;
1126                 fc.fbase = 0;
1127                 fc.fscope = 0;
1128
1129                 /* If the base of the search is missing, signal a refresh */
1130                 rc = syncprov_findbase( op, &fc );
1131                 if ( rc != LDAP_SUCCESS ) {
1132                         SlapReply rs = {REP_RESULT};
1133                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1134                                 "search base has changed" );
1135                         sprev->s_next = snext;
1136                         syncprov_drop_psearch( ss, 1 );
1137                         ss = sprev;
1138                         continue;
1139                 }
1140
1141
1142                 /* If we're sending results now, look for this op in old matches */
1143                 if ( !saveit ) {
1144                         syncmatches *old;
1145
1146                         /* Did we modify the search base? */
1147                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1148                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1149                                 ss->s_flags |= PS_WROTE_BASE;
1150                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1151                         }
1152
1153                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1154                                 old=sm, sm=sm->sm_next ) {
1155                                 if ( sm->sm_op == ss ) {
1156                                         found = 1;
1157                                         old->sm_next = sm->sm_next;
1158                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1159                                         break;
1160                                 }
1161                         }
1162                 }
1163
1164                 /* check if current o_req_dn is in scope and matches filter */
1165                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1166                         LDAP_COMPARE_TRUE ) {
1167                         if ( saveit ) {
1168                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1169                                 sm->sm_next = opc->smatches;
1170                                 sm->sm_op = ss;
1171                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1172                                 ++ss->s_inuse;
1173                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1174                                 opc->smatches = sm;
1175                         } else {
1176                                 /* if found send UPDATE else send ADD */
1177                                 syncprov_qresp( opc, ss,
1178                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1179                         }
1180                 } else if ( !saveit && found ) {
1181                         /* send DELETE */
1182                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1183                 }
1184         }
1185         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1186
1187         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1188                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1189                 be_entry_release_rw( op, e, 0 );
1190                 op->o_bd->bd_info = (BackendInfo *)on;
1191         }
1192         if ( freefdn ) {
1193                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1194         }
1195         op->o_bd = b0;
1196 }
1197
1198 static int
1199 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1200 {
1201         slap_callback *cb = op->o_callback;
1202         opcookie *opc = cb->sc_private;
1203         slap_overinst *on = opc->son;
1204         syncprov_info_t         *si = on->on_bi.bi_private;
1205         syncmatches *sm, *snext;
1206         modtarget *mt, mtdummy;
1207
1208         for (sm = opc->smatches; sm; sm=snext) {
1209                 snext = sm->sm_next;
1210                 syncprov_free_syncop( sm->sm_op );
1211                 op->o_tmpfree( sm, op->o_tmpmemctx );
1212         }
1213
1214         /* Remove op from lock table */
1215         mtdummy.mt_op = op;
1216         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1217         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1218         if ( mt ) {
1219                 modinst *mi = mt->mt_mods;
1220
1221                 /* If there are more, promote the next one */
1222                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1223                 if ( mi->mi_next ) {
1224                         mt->mt_mods = mi->mi_next;
1225                         mt->mt_op = mt->mt_mods->mi_op;
1226                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1227                 } else {
1228                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1229                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1230                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1231                         ch_free( mt );
1232                 }
1233         }
1234         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1235         if ( !BER_BVISNULL( &opc->suuid ))
1236                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1237         if ( !BER_BVISNULL( &opc->sndn ))
1238                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1239         if ( !BER_BVISNULL( &opc->sdn ))
1240                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1241         op->o_callback = cb->sc_next;
1242         op->o_tmpfree(cb, op->o_tmpmemctx);
1243
1244         return 0;
1245 }
1246
1247 static void
1248 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1249 {
1250         syncprov_info_t         *si = on->on_bi.bi_private;
1251         Modifications mod;
1252         Operation opm;
1253         SlapReply rsm = { 0 };
1254         struct berval bv[2];
1255         slap_callback cb = {0};
1256
1257         /* If ctxcsn is empty, delete it */
1258         if ( BER_BVISEMPTY( &si->si_ctxcsn )) {
1259                 mod.sml_values = NULL;
1260         } else {
1261                 mod.sml_values = bv;
1262                 bv[1].bv_val = NULL;
1263                 bv[0] = si->si_ctxcsn;
1264         }
1265         mod.sml_nvalues = NULL;
1266         mod.sml_desc = slap_schema.si_ad_contextCSN;
1267         mod.sml_op = LDAP_MOD_REPLACE;
1268         mod.sml_flags = 0;
1269         mod.sml_next = NULL;
1270
1271         cb.sc_response = slap_null_cb;
1272         opm = *op;
1273         opm.o_tag = LDAP_REQ_MODIFY;
1274         opm.o_callback = &cb;
1275         opm.orm_modlist = &mod;
1276         opm.o_req_dn = op->o_bd->be_suffix[0];
1277         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1278         opm.o_bd->bd_info = on->on_info->oi_orig;
1279         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1280         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1281         opm.o_bd->be_modify( &opm, &rsm );
1282         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1283         if ( mod.sml_next != NULL ) {
1284                 slap_mods_free( mod.sml_next, 1 );
1285         }
1286 }
1287
1288 static void
1289 syncprov_add_slog( Operation *op )
1290 {
1291         opcookie *opc = op->o_callback->sc_private;
1292         slap_overinst *on = opc->son;
1293         syncprov_info_t         *si = on->on_bi.bi_private;
1294         sessionlog *sl;
1295         slog_entry *se;
1296
1297         sl = si->si_logs;
1298         {
1299                 /* Allocate a record. UUIDs are not NUL-terminated. */
1300                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1301                         op->o_csn.bv_len + 1 );
1302                 se->se_next = NULL;
1303                 se->se_tag = op->o_tag;
1304
1305                 se->se_uuid.bv_val = (char *)(&se[1]);
1306                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1307                 se->se_uuid.bv_len = opc->suuid.bv_len;
1308
1309                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1310                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1311                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1312                 se->se_csn.bv_len = op->o_csn.bv_len;
1313
1314                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1315                 if ( sl->sl_head ) {
1316                         sl->sl_tail->se_next = se;
1317                 } else {
1318                         sl->sl_head = se;
1319                 }
1320                 sl->sl_tail = se;
1321                 sl->sl_num++;
1322                 while ( sl->sl_num > sl->sl_size ) {
1323                         se = sl->sl_head;
1324                         sl->sl_head = se->se_next;
1325                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1326                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1327                         ch_free( se );
1328                         sl->sl_num--;
1329                 }
1330                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1331         }
1332 }
1333
1334 /* Just set a flag if we found the matching entry */
1335 static int
1336 playlog_cb( Operation *op, SlapReply *rs )
1337 {
1338         if ( rs->sr_type == REP_SEARCH ) {
1339                 op->o_callback->sc_private = (void *)1;
1340         }
1341         return rs->sr_err;
1342 }
1343
1344 /* enter with sl->sl_mutex locked, release before returning */
1345 static void
1346 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1347         sync_control *srs, struct berval *ctxcsn )
1348 {
1349         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1350         slog_entry *se;
1351         int i, j, ndel, num, nmods, mmods;
1352         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1353         BerVarray uuids;
1354         struct berval delcsn;
1355
1356         if ( !sl->sl_num ) {
1357                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1358                 return;
1359         }
1360
1361         num = sl->sl_num;
1362         i = 0;
1363         nmods = 0;
1364
1365         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1366                 num * UUID_LEN, op->o_tmpmemctx );
1367         uuids[0].bv_val = (char *)(uuids + num + 1);
1368
1369         delcsn.bv_len = 0;
1370         delcsn.bv_val = cbuf;
1371
1372         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1373          * and everything else at the end. Do this first so we can
1374          * unlock the list mutex.
1375          */
1376         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n", srs->sr_state.ctxcsn.bv_val, 0, 0 );
1377         for ( se=sl->sl_head; se; se=se->se_next ) {
1378                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1379                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn );
1380                 if ( ndel <= 0 ) {
1381                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1382                         continue;
1383                 }
1384                 ndel = ber_bvcmp( &se->se_csn, ctxcsn );
1385                 if ( ndel > 0 ) {
1386                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1387                         break;
1388                 }
1389                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1390                         j = i;
1391                         i++;
1392                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1393                         delcsn.bv_len = se->se_csn.bv_len;
1394                         delcsn.bv_val[delcsn.bv_len] = '\0';
1395                 } else {
1396                         nmods++;
1397                         j = num - nmods;
1398                 }
1399                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1400                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1401                 uuids[j].bv_len = UUID_LEN;
1402         }
1403         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1404
1405         ndel = i;
1406
1407         /* Zero out unused slots */
1408         for ( i=ndel; i < num - nmods; i++ )
1409                 uuids[i].bv_len = 0;
1410
1411         /* Mods must be validated to see if they belong in this delete set.
1412          */
1413
1414         mmods = nmods;
1415         /* Strip any duplicates */
1416         for ( i=0; i<nmods; i++ ) {
1417                 for ( j=0; j<ndel; j++ ) {
1418                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1419                                 uuids[num - 1 - i].bv_len = 0;
1420                                 mmods --;
1421                                 break;
1422                         }
1423                 }
1424                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1425                 for ( j=0; j<i; j++ ) {
1426                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1427                                 uuids[num - 1 - i].bv_len = 0;
1428                                 mmods --;
1429                                 break;
1430                         }
1431                 }
1432         }
1433
1434         if ( mmods ) {
1435                 Operation fop;
1436                 SlapReply frs = { REP_RESULT };
1437                 int rc;
1438                 Filter mf, af;
1439 #ifdef LDAP_COMP_MATCH
1440                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1441 #else
1442                 AttributeAssertion eq;
1443 #endif
1444                 slap_callback cb = {0};
1445
1446                 fop = *op;
1447
1448                 fop.o_sync_mode = 0;
1449                 fop.o_callback = &cb;
1450                 fop.ors_limit = NULL;
1451                 fop.ors_tlimit = SLAP_NO_LIMIT;
1452                 fop.ors_attrs = slap_anlist_all_attributes;
1453                 fop.ors_attrsonly = 0;
1454                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1455
1456                 af.f_choice = LDAP_FILTER_AND;
1457                 af.f_next = NULL;
1458                 af.f_and = &mf;
1459                 mf.f_choice = LDAP_FILTER_EQUALITY;
1460                 mf.f_ava = &eq;
1461                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1462                 mf.f_next = fop.ors_filter;
1463
1464                 fop.ors_filter = &af;
1465
1466                 cb.sc_response = playlog_cb;
1467                 fop.o_bd->bd_info = on->on_info->oi_orig;
1468
1469                 for ( i=ndel; i<num; i++ ) {
1470                         if ( uuids[i].bv_len == 0 ) continue;
1471
1472                         mf.f_av_value = uuids[i];
1473                         cb.sc_private = NULL;
1474                         fop.ors_slimit = 1;
1475                         frs.sr_nentries = 0;
1476                         rc = fop.o_bd->be_search( &fop, &frs );
1477
1478                         /* If entry was not found, add to delete list */
1479                         if ( !cb.sc_private ) {
1480                                 uuids[ndel++] = uuids[i];
1481                         }
1482                 }
1483                 fop.o_bd->bd_info = (BackendInfo *)on;
1484         }
1485         if ( ndel ) {
1486                 struct berval cookie;
1487
1488                 slap_compose_sync_cookie( op, &cookie, &delcsn, srs->sr_state.rid );
1489                 uuids[ndel].bv_val = NULL;
1490                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1491                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1492         }
1493         op->o_tmpfree( uuids, op->o_tmpmemctx );
1494 }
1495
1496 static int
1497 syncprov_op_response( Operation *op, SlapReply *rs )
1498 {
1499         opcookie *opc = op->o_callback->sc_private;
1500         slap_overinst *on = opc->son;
1501         syncprov_info_t         *si = on->on_bi.bi_private;
1502         syncmatches *sm;
1503
1504         if ( rs->sr_err == LDAP_SUCCESS )
1505         {
1506                 struct berval maxcsn = BER_BVNULL;
1507                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1508                 int do_check=0;
1509
1510                 /* Update our context CSN */
1511                 cbuf[0] = '\0';
1512                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1513                 slap_get_commit_csn( op, &maxcsn );
1514                 if ( !BER_BVISNULL( &maxcsn ) ) {
1515                         strcpy( cbuf, maxcsn.bv_val );
1516                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1517                                 strcpy( si->si_ctxcsnbuf, cbuf );
1518                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1519                         }
1520                 }
1521
1522                 /* Don't do any processing for consumer contextCSN updates */
1523                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1524                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1525                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1526                         return SLAP_CB_CONTINUE;
1527                 }
1528
1529                 si->si_numops++;
1530                 if ( si->si_chkops || si->si_chktime ) {
1531                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1532                                 do_check = 1;
1533                                 si->si_numops = 0;
1534                         }
1535                         if ( si->si_chktime &&
1536                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1537                                 do_check = 1;
1538                                 si->si_chklast = op->o_time;
1539                         }
1540                 }
1541                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1542
1543                 if ( do_check ) {
1544                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1545                         syncprov_checkpoint( op, rs, on );
1546                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1547                 }
1548
1549                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1550                 opc->sctxcsn.bv_val = cbuf;
1551
1552                 /* Handle any persistent searches */
1553                 if ( si->si_ops ) {
1554                         switch(op->o_tag) {
1555                         case LDAP_REQ_ADD:
1556                         case LDAP_REQ_MODIFY:
1557                         case LDAP_REQ_MODRDN:
1558                         case LDAP_REQ_EXTENDED:
1559                                 syncprov_matchops( op, opc, 0 );
1560                                 break;
1561                         case LDAP_REQ_DELETE:
1562                                 /* for each match in opc->smatches:
1563                                  *   send DELETE msg
1564                                  */
1565                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1566                                         if ( sm->sm_op->s_op->o_abandon )
1567                                                 continue;
1568                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1569                                 }
1570                                 break;
1571                         }
1572                 }
1573
1574                 /* Add any log records */
1575                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1576                         syncprov_add_slog( op );
1577                 }
1578
1579         }
1580         return SLAP_CB_CONTINUE;
1581 }
1582
1583 /* We don't use a subentry to store the context CSN any more.
1584  * We expose the current context CSN as an operational attribute
1585  * of the suffix entry.
1586  */
1587 static int
1588 syncprov_op_compare( Operation *op, SlapReply *rs )
1589 {
1590         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1591         syncprov_info_t         *si = on->on_bi.bi_private;
1592         int rc = SLAP_CB_CONTINUE;
1593
1594         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1595                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1596         {
1597                 Entry e = {0};
1598                 Attribute a = {0};
1599                 struct berval bv[2];
1600
1601                 e.e_name = op->o_bd->be_suffix[0];
1602                 e.e_nname = op->o_bd->be_nsuffix[0];
1603
1604                 BER_BVZERO( &bv[1] );
1605                 bv[0] = si->si_ctxcsn;
1606
1607                 a.a_desc = slap_schema.si_ad_contextCSN;
1608                 a.a_vals = bv;
1609                 a.a_nvals = a.a_vals;
1610
1611                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1612
1613                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1614                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1615                 if ( ! rs->sr_err ) {
1616                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1617                         goto return_results;
1618                 }
1619
1620                 if ( get_assert( op ) &&
1621                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1622                 {
1623                         rs->sr_err = LDAP_ASSERTION_FAILED;
1624                         goto return_results;
1625                 }
1626
1627
1628                 rs->sr_err = LDAP_COMPARE_FALSE;
1629
1630                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1631                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1632                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1633                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1634                 {
1635                         rs->sr_err = LDAP_COMPARE_TRUE;
1636                 }
1637
1638 return_results:;
1639
1640                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1641
1642                 send_ldap_result( op, rs );
1643
1644                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1645                         rs->sr_err = LDAP_SUCCESS;
1646                 }
1647                 rc = rs->sr_err;
1648         }
1649
1650         return rc;
1651 }
1652
1653 static int
1654 syncprov_op_mod( Operation *op, SlapReply *rs )
1655 {
1656         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1657         syncprov_info_t         *si = on->on_bi.bi_private;
1658
1659         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1660                 sizeof(opcookie) +
1661                 (si->si_ops ? sizeof(modinst) : 0 ),
1662                 op->o_tmpmemctx);
1663         opcookie *opc = (opcookie *)(cb+1);
1664         opc->son = on;
1665         cb->sc_response = syncprov_op_response;
1666         cb->sc_cleanup = syncprov_op_cleanup;
1667         cb->sc_private = opc;
1668         cb->sc_next = op->o_callback;
1669         op->o_callback = cb;
1670
1671         /* If there are active persistent searches, lock this operation.
1672          * See seqmod.c for the locking logic on its own.
1673          */
1674         if ( si->si_ops ) {
1675                 modtarget *mt, mtdummy;
1676                 modinst *mi;
1677
1678                 mi = (modinst *)(opc+1);
1679                 mi->mi_op = op;
1680
1681                 /* See if we're already modifying this entry... */
1682                 mtdummy.mt_op = op;
1683                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1684                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1685                 if ( mt ) {
1686                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1687                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1688                         mt->mt_tail->mi_next = mi;
1689                         mt->mt_tail = mi;
1690                         /* wait for this op to get to head of list */
1691                         while ( mt->mt_mods != mi ) {
1692                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1693                                 ldap_pvt_thread_yield();
1694                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1695
1696                                 /* clean up if the caller is giving up */
1697                                 if ( op->o_abandon ) {
1698                                         modinst *m2;
1699                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1700                                                 m2 = m2->mi_next );
1701                                         m2->mi_next = mi->mi_next;
1702                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1703                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1704                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1705                                         return SLAPD_ABANDON;
1706                                 }
1707                         }
1708                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1709                 } else {
1710                         /* Record that we're modifying this entry now */
1711                         mt = ch_malloc( sizeof(modtarget) );
1712                         mt->mt_mods = mi;
1713                         mt->mt_tail = mi;
1714                         mt->mt_op = mi->mi_op;
1715                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1716                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1717                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1718                 }
1719         }
1720
1721         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1722                 syncprov_matchops( op, opc, 1 );
1723
1724         return SLAP_CB_CONTINUE;
1725 }
1726
1727 static int
1728 syncprov_op_extended( Operation *op, SlapReply *rs )
1729 {
1730         if ( exop_is_write( op ))
1731                 return syncprov_op_mod( op, rs );
1732
1733         return SLAP_CB_CONTINUE;
1734 }
1735
1736 typedef struct searchstate {
1737         slap_overinst *ss_on;
1738         syncops *ss_so;
1739         int ss_present;
1740         struct berval ss_ctxcsn;
1741         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1742 } searchstate;
1743
1744 static int
1745 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1746 {
1747         if ( rs->sr_ctrls ) {
1748                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1749                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1750                 rs->sr_ctrls = NULL;
1751         }
1752         return 0;
1753 }
1754
1755 static void
1756 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1757 {
1758         Operation *op2;
1759         int i, alen = 0;
1760         size_t size;
1761         char *ptr;
1762         GroupAssertion *g1, *g2;
1763
1764         /* count the search attrs */
1765         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1766                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1767         }
1768         /* Make a new copy of the operation */
1769         size = sizeof(Operation) + sizeof(Opheader) +
1770                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1771                 op->o_req_dn.bv_len + 1 +
1772                 op->o_req_ndn.bv_len + 1 +
1773                 op->o_ndn.bv_len + 1 +
1774                 so->s_filterstr.bv_len + 1;
1775         op2 = (Operation *)ch_calloc( 1, size );
1776         op2->o_hdr = (Opheader *)(op2+1);
1777
1778         /* Copy the fields we care about explicitly, leave the rest alone */
1779         *op2->o_hdr = *op->o_hdr;
1780         op2->o_tag = op->o_tag;
1781         op2->o_time = op->o_time;
1782         op2->o_bd = on->on_info->oi_origdb;
1783         op2->o_request = op->o_request;
1784         op2->o_private = on;
1785
1786         if ( i ) {
1787                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1788                 ptr = (char *)(op2->ors_attrs+i+1);
1789                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1790                         op2->ors_attrs[i] = op->ors_attrs[i];
1791                         op2->ors_attrs[i].an_name.bv_val = ptr;
1792                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1793                 }
1794                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1795         } else {
1796                 ptr = (char *)(op2->o_hdr + 1);
1797         }
1798         op2->o_authz = op->o_authz;
1799         op2->o_ndn.bv_val = ptr;
1800         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1801         op2->o_dn = op2->o_ndn;
1802         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1803         op2->o_req_dn.bv_val = ptr;
1804         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1805         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1806         op2->o_req_ndn.bv_val = ptr;
1807         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1808         op2->ors_filterstr.bv_val = ptr;
1809         strcpy( ptr, so->s_filterstr.bv_val );
1810         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1811
1812         /* Skip the AND/GE clause that we stuck on in front */
1813         if ( so->s_flags & PS_FIX_FILTER ) {
1814                 op2->ors_filter = op->ors_filter->f_and->f_next;
1815                 so->s_flags ^= PS_FIX_FILTER;
1816         } else {
1817                 op2->ors_filter = op->ors_filter;
1818         }
1819         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1820         so->s_op = op2;
1821
1822         /* Copy any cached group ACLs individually */
1823         op2->o_groups = NULL;
1824         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1825                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1826                 *g2 = *g1;
1827                 strcpy( g2->ga_ndn, g1->ga_ndn );
1828                 g2->ga_next = op2->o_groups;
1829                 op2->o_groups = g2;
1830         }
1831         /* Don't allow any further group caching */
1832         op2->o_do_not_cache = 1;
1833
1834         /* Add op2 to conn so abandon will find us */
1835         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1836         op->o_conn->c_n_ops_executing++;
1837         op->o_conn->c_n_ops_completed--;
1838         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1839         so->s_flags |= PS_IS_DETACHED;
1840         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1841
1842         /* Prevent anyone else from trying to send a result for this op */
1843         op->o_abandon = 1;
1844 }
1845
1846 static int
1847 syncprov_search_response( Operation *op, SlapReply *rs )
1848 {
1849         searchstate *ss = op->o_callback->sc_private;
1850         slap_overinst *on = ss->ss_on;
1851         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1852
1853         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1854                 Attribute *a;
1855                 /* If we got a referral without a referral object, there's
1856                  * something missing that we cannot replicate. Just ignore it.
1857                  * The consumer will abort because we didn't send the expected
1858                  * control.
1859                  */
1860                 if ( !rs->sr_entry ) {
1861                         assert( rs->sr_entry != NULL );
1862                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1863                         return SLAP_CB_CONTINUE;
1864                 }
1865                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1866                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1867                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1868                 }
1869                 if ( a ) {
1870                         /* Make sure entry is less than the snapshot'd contextCSN */
1871                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 ) {
1872                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s greater than snapshot %s\n",
1873                                         rs->sr_entry->e_name.bv_val,
1874                                         a->a_nvals[0].bv_val,
1875                                         ss->ss_ctxcsn.bv_val );
1876                                 return LDAP_SUCCESS;
1877                         }
1878
1879                         /* Don't send the ctx entry twice */
1880                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1881                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) ) {
1882                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s matches ctx %s\n",
1883                                         rs->sr_entry->e_name.bv_val,
1884                                         a->a_nvals[0].bv_val,
1885                                         srs->sr_state.ctxcsn.bv_val );
1886                                 return LDAP_SUCCESS;
1887                         }
1888                 }
1889                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1890                         op->o_tmpmemctx );
1891                 rs->sr_ctrls[1] = NULL;
1892                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1893                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1894         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1895                 struct berval cookie;
1896
1897                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1898                         srs->sr_state.rid );
1899
1900                 /* Is this a regular refresh? */
1901                 if ( !ss->ss_so ) {
1902                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1903                                 op->o_tmpmemctx );
1904                         rs->sr_ctrls[1] = NULL;
1905                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1906                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1907                                         LDAP_SYNC_REFRESH_DELETES );
1908                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1909                 } else {
1910                 /* It's RefreshAndPersist, transition to Persist phase */
1911                         syncprov_sendinfo( op, rs, ss->ss_present ?
1912                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1913                                 &cookie, 1, NULL, 0 );
1914                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1915
1916                         /* Detach this Op from frontend control */
1917                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1918
1919                         /* Turn off the refreshing flag */
1920                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1921
1922                         syncprov_detach_op( op, ss->ss_so, on );
1923
1924                         /* If there are queued responses, fire them off */
1925                         if ( ss->ss_so->s_res )
1926                                 syncprov_qstart( ss->ss_so );
1927                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1928
1929                         return LDAP_SUCCESS;
1930                 }
1931         }
1932
1933         return SLAP_CB_CONTINUE;
1934 }
1935
1936 static int
1937 syncprov_op_search( Operation *op, SlapReply *rs )
1938 {
1939         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1940         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1941         slap_callback   *cb;
1942         int gotstate = 0, nochange = 0, do_present;
1943         syncops *sop = NULL;
1944         searchstate *ss;
1945         sync_control *srs;
1946         struct berval ctxcsn;
1947         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1948
1949         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1950
1951         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1952                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1953                 return rs->sr_err;
1954         }
1955
1956         do_present = si->si_nopres ? 0 : 1;
1957
1958         srs = op->o_controls[slap_cids.sc_LDAPsync];
1959         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1960
1961         /* If this is a persistent search, set it up right away */
1962         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1963                 syncops so = {0};
1964                 fbase_cookie fc;
1965                 opcookie opc;
1966                 slap_callback sc;
1967
1968                 fc.fss = &so;
1969                 fc.fbase = 0;
1970                 so.s_eid = NOID;
1971                 so.s_op = op;
1972                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1973                 /* syncprov_findbase expects to be called as a callback... */
1974                 sc.sc_private = &opc;
1975                 opc.son = on;
1976                 ldap_pvt_thread_mutex_init( &so.s_mutex );
1977                 cb = op->o_callback;
1978                 op->o_callback = &sc;
1979                 rs->sr_err = syncprov_findbase( op, &fc );
1980                 op->o_callback = cb;
1981                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
1982
1983                 if ( rs->sr_err != LDAP_SUCCESS ) {
1984                         send_ldap_result( op, rs );
1985                         return rs->sr_err;
1986                 }
1987                 sop = ch_malloc( sizeof( syncops ));
1988                 *sop = so;
1989                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1990                 sop->s_rid = srs->sr_state.rid;
1991                 sop->s_inuse = 1;
1992
1993                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1994                 sop->s_next = si->si_ops;
1995                 si->si_ops = sop;
1996                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1997         }
1998
1999         /* snapshot the ctxcsn */
2000         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2001         strcpy( csnbuf, si->si_ctxcsnbuf );
2002         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
2003         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2004         ctxcsn.bv_val = csnbuf;
2005
2006         /* If we have a cookie, handle the PRESENT lookups */
2007         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
2008                 sessionlog *sl;
2009
2010                 /* The cookie was validated when it was parsed, just use it */
2011
2012                 /* If just Refreshing and nothing has changed, shortcut it */
2013                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
2014                         nochange = 1;
2015                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2016                                 LDAPControl     *ctrls[2];
2017
2018                                 ctrls[0] = NULL;
2019                                 ctrls[1] = NULL;
2020                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2021                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2022                                 rs->sr_ctrls = ctrls;
2023                                 rs->sr_err = LDAP_SUCCESS;
2024                                 send_ldap_result( op, rs );
2025                                 rs->sr_ctrls = NULL;
2026                                 return rs->sr_err;
2027                         }
2028                         goto shortcut;
2029                 }
2030                 /* Do we have a sessionlog for this search? */
2031                 sl=si->si_logs;
2032                 if ( sl ) {
2033                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2034                         /* Are there any log entries, and is the consumer state
2035                          * present in the session log?
2036                          */
2037                         if ( sl->sl_num > 0 && ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
2038                                 do_present = 0;
2039                                 /* mutex is unlocked in playlog */
2040                                 syncprov_playlog( op, rs, sl, srs, &ctxcsn );
2041                         } else {
2042                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2043                         }
2044                 }
2045                 /* Is the CSN still present in the database? */
2046                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2047                         /* No, so a reload is required */
2048                         /* the 2.2 consumer doesn't send this hint */
2049                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2050                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2051                                 return rs->sr_err;
2052                         }
2053                 } else {
2054                         gotstate = 1;
2055                         /* If changed and doing Present lookup, send Present UUIDs */
2056                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2057                                 LDAP_SUCCESS ) {
2058                                 send_ldap_result( op, rs );
2059                                 return rs->sr_err;
2060                         }
2061                 }
2062         }
2063
2064 shortcut:
2065         /* Append CSN range to search filter, save original filter
2066          * for persistent search evaluation
2067          */
2068         if ( sop ) {
2069                 sop->s_filterstr= op->ors_filterstr;
2070         }
2071
2072         /* If something changed, find the changes */
2073         if ( gotstate && !nochange ) {
2074                 Filter *fand, *fava;
2075
2076                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2077                 fand->f_choice = LDAP_FILTER_AND;
2078                 fand->f_next = NULL;
2079                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2080                 fand->f_and = fava;
2081                 fava->f_choice = LDAP_FILTER_GE;
2082                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2083                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2084 #ifdef LDAP_COMP_MATCH
2085                 fava->f_ava->aa_cf = NULL;
2086 #endif
2087                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2088                 fava->f_next = op->ors_filter;
2089                 op->ors_filter = fand;
2090                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2091                 if ( sop )
2092                         sop->s_flags |= PS_FIX_FILTER;
2093         }
2094
2095         /* Let our callback add needed info to returned entries */
2096         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2097         ss = (searchstate *)(cb+1);
2098         ss->ss_on = on;
2099         ss->ss_so = sop;
2100         ss->ss_present = do_present;
2101         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2102         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2103         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2104         cb->sc_response = syncprov_search_response;
2105         cb->sc_cleanup = syncprov_search_cleanup;
2106         cb->sc_private = ss;
2107         cb->sc_next = op->o_callback;
2108         op->o_callback = cb;
2109
2110 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2111         op->o_sync_mode &= SLAP_CONTROL_MASK;
2112 #endif
2113
2114         /* If this is a persistent search and no changes were reported during
2115          * the refresh phase, just invoke the response callback to transition
2116          * us into persist phase
2117          */
2118         if ( nochange ) {
2119                 rs->sr_err = LDAP_SUCCESS;
2120                 rs->sr_nentries = 0;
2121                 send_ldap_result( op, rs );
2122                 return rs->sr_err;
2123         }
2124         return SLAP_CB_CONTINUE;
2125 }
2126
2127 static int
2128 syncprov_operational(
2129         Operation *op,
2130         SlapReply *rs )
2131 {
2132         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2133         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2134
2135         if ( rs->sr_entry &&
2136                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2137
2138                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2139                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2140                         Attribute *a, **ap = NULL;
2141
2142                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2143                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2144                                         break;
2145                         }
2146
2147                         if ( !a ) {
2148                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2149
2150                                 a = ch_malloc( sizeof(Attribute));
2151                                 a->a_desc = slap_schema.si_ad_contextCSN;
2152                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2153                                 a->a_vals[1].bv_val = NULL;
2154                                 a->a_nvals = a->a_vals;
2155                                 a->a_next = NULL;
2156                                 a->a_flags = 0;
2157                                 *ap = a;
2158                         }
2159
2160                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2161                         if ( !ap ) {
2162                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2163                         } else {
2164                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2165                         }
2166                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2167                 }
2168         }
2169         return SLAP_CB_CONTINUE;
2170 }
2171
2172 enum {
2173         SP_CHKPT = 1,
2174         SP_SESSL,
2175         SP_NOPRES,
2176         SP_USEHINT
2177 };
2178
2179 static ConfigDriver sp_cf_gen;
2180
2181 static ConfigTable spcfg[] = {
2182         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2183                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2184                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2185                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2186         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2187                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2188                         "DESC 'Session log size in ops' "
2189                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2190         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2191                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2192                         "DESC 'Omit Present phase processing' "
2193                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2194         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2195                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2196                         "DESC 'Observe Reload Hint in Request control' "
2197                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2198         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2199 };
2200
2201 static ConfigOCs spocs[] = {
2202         { "( OLcfgOvOc:1.1 "
2203                 "NAME 'olcSyncProvConfig' "
2204                 "DESC 'SyncRepl Provider configuration' "
2205                 "SUP olcOverlayConfig "
2206                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2207                         Cft_Overlay, spcfg },
2208         { NULL, 0, NULL }
2209 };
2210
2211 static int
2212 sp_cf_gen(ConfigArgs *c)
2213 {
2214         slap_overinst           *on = (slap_overinst *)c->bi;
2215         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2216         int rc = 0;
2217
2218         if ( c->op == SLAP_CONFIG_EMIT ) {
2219                 switch ( c->type ) {
2220                 case SP_CHKPT:
2221                         if ( si->si_chkops || si->si_chktime ) {
2222                                 struct berval bv;
2223                                 bv.bv_len = sprintf( c->msg, "%d %d",
2224                                         si->si_chkops, si->si_chktime );
2225                                 bv.bv_val = c->msg;
2226                                 value_add_one( &c->rvalue_vals, &bv );
2227                         } else {
2228                                 rc = 1;
2229                         }
2230                         break;
2231                 case SP_SESSL:
2232                         if ( si->si_logs ) {
2233                                 c->value_int = si->si_logs->sl_size;
2234                         } else {
2235                                 rc = 1;
2236                         }
2237                         break;
2238                 case SP_NOPRES:
2239                         if ( si->si_nopres ) {
2240                                 c->value_int = 1;
2241                         } else {
2242                                 rc = 1;
2243                         }
2244                         break;
2245                 case SP_USEHINT:
2246                         if ( si->si_usehint ) {
2247                                 c->value_int = 1;
2248                         } else {
2249                                 rc = 1;
2250                         }
2251                         break;
2252                 }
2253                 return rc;
2254         } else if ( c->op == LDAP_MOD_DELETE ) {
2255                 switch ( c->type ) {
2256                 case SP_CHKPT:
2257                         si->si_chkops = 0;
2258                         si->si_chktime = 0;
2259                         break;
2260                 case SP_SESSL:
2261                         if ( si->si_logs )
2262                                 si->si_logs->sl_size = 0;
2263                         else
2264                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2265                         break;
2266                 case SP_NOPRES:
2267                         if ( si->si_nopres )
2268                                 si->si_nopres = 0;
2269                         else
2270                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2271                         break;
2272                 case SP_USEHINT:
2273                         if ( si->si_usehint )
2274                                 si->si_usehint = 0;
2275                         else
2276                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2277                         break;
2278                 }
2279                 return rc;
2280         }
2281         switch ( c->type ) {
2282         case SP_CHKPT:
2283                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2284                         snprintf( c->msg, sizeof( c->msg ), "%s unable to parse checkpoint ops # \"%s\"",
2285                                 c->argv[0], c->argv[1] );
2286                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2287                                 "%s: %s\n", c->log, c->msg, 0 );
2288                         return ARG_BAD_CONF;
2289                 }
2290                 if ( si->si_chkops <= 0 ) {
2291                         snprintf( c->msg, sizeof( c->msg ), "%s invalid checkpoint ops # \"%d\"",
2292                                 c->argv[0], si->si_chkops );
2293                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2294                                 "%s: %s\n", c->log, c->msg, 0 );
2295                         return ARG_BAD_CONF;
2296                 }
2297                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2298                         snprintf( c->msg, sizeof( c->msg ), "%s unable to parse checkpoint time \"%s\"",
2299                                 c->argv[0], c->argv[1] );
2300                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2301                                 "%s: %s\n", c->log, c->msg, 0 );
2302                         return ARG_BAD_CONF;
2303                 }
2304                 if ( si->si_chktime <= 0 ) {
2305                         snprintf( c->msg, sizeof( c->msg ), "%s invalid checkpoint time \"%d\"",
2306                                 c->argv[0], si->si_chkops );
2307                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2308                                 "%s: %s\n", c->log, c->msg, 0 );
2309                         return ARG_BAD_CONF;
2310                 }
2311                 si->si_chktime *= 60;
2312                 break;
2313         case SP_SESSL: {
2314                 sessionlog *sl;
2315                 int size = c->value_int;
2316
2317                 if ( size < 0 ) {
2318                         snprintf( c->msg, sizeof( c->msg ), "%s size %d is negative",
2319                                 c->argv[0], size );
2320                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2321                                 "%s: %s\n", c->log, c->msg, 0 );
2322                         return ARG_BAD_CONF;
2323                 }
2324                 sl = si->si_logs;
2325                 if ( !sl ) {
2326                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2327                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2328                         sl->sl_mincsn.bv_len = 0;
2329                         sl->sl_num = 0;
2330                         sl->sl_head = sl->sl_tail = NULL;
2331                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2332                         si->si_logs = sl;
2333                 }
2334                 sl->sl_size = size;
2335                 }
2336                 break;
2337         case SP_NOPRES:
2338                 si->si_nopres = c->value_int;
2339                 break;
2340         case SP_USEHINT:
2341                 si->si_usehint = c->value_int;
2342                 break;
2343         }
2344         return rc;
2345 }
2346
2347 /* ITS#3456 we cannot run this search on the main thread, must use a
2348  * child thread in order to insure we have a big enough stack.
2349  */
2350 static void *
2351 syncprov_db_otask(
2352         void *ptr
2353 )
2354 {
2355         syncprov_findcsn( ptr, FIND_MAXCSN );
2356         return NULL;
2357 }
2358
2359 /* Read any existing contextCSN from the underlying db.
2360  * Then search for any entries newer than that. If no value exists,
2361  * just generate it. Cache whatever result.
2362  */
2363 static int
2364 syncprov_db_open(
2365     BackendDB *be
2366 )
2367 {
2368         slap_overinst   *on = (slap_overinst *) be->bd_info;
2369         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2370
2371         Connection conn = { 0 };
2372         OperationBuffer opbuf = { 0 };
2373         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2374         Operation *op = (Operation *) &opbuf;
2375         Entry *e;
2376         Attribute *a;
2377         int rc;
2378         void *thrctx = NULL;
2379
2380         if ( !SLAP_LASTMOD( be )) {
2381                 Debug( LDAP_DEBUG_ANY,
2382                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2383                 return -1;
2384         }
2385
2386         if ( slapMode & SLAP_TOOL_MODE ) {
2387                 return 0;
2388         }
2389
2390         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2391         if ( rc ) {
2392                 return rc;
2393         }
2394
2395         thrctx = ldap_pvt_thread_pool_context();
2396         connection_fake_init( &conn, op, thrctx );
2397         op->o_bd = be;
2398         op->o_dn = be->be_rootdn;
2399         op->o_ndn = be->be_rootndn;
2400
2401         ctxcsnbuf[0] = '\0';
2402
2403         op->o_bd->bd_info = on->on_info->oi_orig;
2404         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2405                 slap_schema.si_ad_contextCSN, 0, &e );
2406
2407         if ( e ) {
2408                 ldap_pvt_thread_t tid;
2409
2410                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2411                 if ( a ) {
2412                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2413                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2414                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2415                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2416                                 si->si_ctxcsn.bv_len );
2417                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2418                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2419                 }
2420                 be_entry_release_rw( op, e, 0 );
2421                 if ( !BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2422                         op->o_bd->bd_info = (BackendInfo *)on;
2423                         op->o_req_dn = be->be_suffix[0];
2424                         op->o_req_ndn = be->be_nsuffix[0];
2425                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2426                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2427                         ldap_pvt_thread_join( tid, NULL );
2428                 }
2429         }
2430
2431         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2432                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2433                 /* If we're also a consumer, and we didn't get a contextCSN,
2434                  * then don't generate anything, wait for our provider to send it
2435                  * to us.
2436                  */
2437                         goto out;
2438                 }
2439                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2440                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2441         }
2442
2443         /* If our ctxcsn is different from what was read from the root
2444          * entry, make sure we do a checkpoint on close
2445          */
2446         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2447                 si->si_numops++;
2448         }
2449
2450 out:
2451         op->o_bd->bd_info = (BackendInfo *)on;
2452         return 0;
2453 }
2454
2455 /* Write the current contextCSN into the underlying db.
2456  */
2457 static int
2458 syncprov_db_close(
2459     BackendDB *be
2460 )
2461 {
2462     slap_overinst   *on = (slap_overinst *) be->bd_info;
2463     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2464
2465         if ( slapMode & SLAP_TOOL_MODE ) {
2466                 return 0;
2467         }
2468         if ( si->si_numops ) {
2469                 Connection conn;
2470                 OperationBuffer opbuf;
2471                 Operation *op = (Operation *) &opbuf;
2472                 SlapReply rs = {REP_RESULT};
2473                 void *thrctx;
2474
2475                 thrctx = ldap_pvt_thread_pool_context();
2476                 connection_fake_init( &conn, op, thrctx );
2477                 op->o_bd = be;
2478                 op->o_dn = be->be_rootdn;
2479                 op->o_ndn = be->be_rootndn;
2480                 syncprov_checkpoint( op, &rs, on );
2481         }
2482
2483     return 0;
2484 }
2485
2486 static int
2487 syncprov_db_init(
2488         BackendDB *be
2489 )
2490 {
2491         slap_overinst   *on = (slap_overinst *)be->bd_info;
2492         syncprov_info_t *si;
2493
2494         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2495                 Debug( LDAP_DEBUG_ANY,
2496                         "syncprov must be instantiated within a database.\n",
2497                         0, 0, 0 );
2498                 return 1;
2499         }
2500
2501         si = ch_calloc(1, sizeof(syncprov_info_t));
2502         on->on_bi.bi_private = si;
2503         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2504         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2505         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2506         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2507
2508         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2509         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2510         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2511         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2512
2513         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2514         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2515
2516         return 0;
2517 }
2518
2519 static int
2520 syncprov_db_destroy(
2521         BackendDB *be
2522 )
2523 {
2524         slap_overinst   *on = (slap_overinst *)be->bd_info;
2525         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2526
2527         if ( si ) {
2528                 if ( si->si_logs ) {
2529                         slog_entry *se = si->si_logs->sl_head;
2530
2531                         while ( se ) {
2532                                 slog_entry *se_next = se->se_next;
2533                                 ch_free( se );
2534                                 se = se_next;
2535                         }
2536
2537                         ch_free( si->si_logs );
2538                 }
2539                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2540                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2541                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2542                 ch_free( si );
2543         }
2544
2545         return 0;
2546 }
2547
2548 static int syncprov_parseCtrl (
2549         Operation *op,
2550         SlapReply *rs,
2551         LDAPControl *ctrl )
2552 {
2553         ber_tag_t tag;
2554         BerElementBuffer berbuf;
2555         BerElement *ber = (BerElement *)&berbuf;
2556         ber_int_t mode;
2557         ber_len_t len;
2558         struct berval cookie = BER_BVNULL;
2559         sync_control *sr;
2560         int rhint = 0;
2561
2562         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2563                 rs->sr_text = "Sync control specified multiple times";
2564                 return LDAP_PROTOCOL_ERROR;
2565         }
2566
2567         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2568                 rs->sr_text = "Sync control specified with pagedResults control";
2569                 return LDAP_PROTOCOL_ERROR;
2570         }
2571
2572         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2573                 rs->sr_text = "Sync control value is empty (or absent)";
2574                 return LDAP_PROTOCOL_ERROR;
2575         }
2576
2577         /* Parse the control value
2578          *      syncRequestValue ::= SEQUENCE {
2579          *              mode   ENUMERATED {
2580          *                      -- 0 unused
2581          *                      refreshOnly             (1),
2582          *                      -- 2 reserved
2583          *                      refreshAndPersist       (3)
2584          *              },
2585          *              cookie  syncCookie OPTIONAL
2586          *      }
2587          */
2588
2589         ber_init2( ber, &ctrl->ldctl_value, 0 );
2590
2591         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2592                 rs->sr_text = "Sync control : mode decoding error";
2593                 return LDAP_PROTOCOL_ERROR;
2594         }
2595
2596         switch( mode ) {
2597         case LDAP_SYNC_REFRESH_ONLY:
2598                 mode = SLAP_SYNC_REFRESH;
2599                 break;
2600         case LDAP_SYNC_REFRESH_AND_PERSIST:
2601                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2602                 break;
2603         default:
2604                 rs->sr_text = "Sync control : unknown update mode";
2605                 return LDAP_PROTOCOL_ERROR;
2606         }
2607
2608         tag = ber_peek_tag( ber, &len );
2609
2610         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2611                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2612                         rs->sr_text = "Sync control : cookie decoding error";
2613                         return LDAP_PROTOCOL_ERROR;
2614                 }
2615                 tag = ber_peek_tag( ber, &len );
2616         }
2617         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2618                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2619                         rs->sr_text = "Sync control : rhint decoding error";
2620                         return LDAP_PROTOCOL_ERROR;
2621                 }
2622         }
2623         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2624                         rs->sr_text = "Sync control : decoding error";
2625                         return LDAP_PROTOCOL_ERROR;
2626         }
2627         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2628         sr->sr_rhint = rhint;
2629         if (!BER_BVISNULL(&cookie)) {
2630                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2631                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2632                         sr->sr_state.rid == -1 ) {
2633                         rs->sr_text = "Sync control : cookie parsing error";
2634                         return LDAP_PROTOCOL_ERROR;
2635                 }
2636         }
2637
2638         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2639
2640         op->o_sync = ctrl->ldctl_iscritical
2641                 ? SLAP_CONTROL_CRITICAL
2642                 : SLAP_CONTROL_NONCRITICAL;
2643
2644         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2645
2646         return LDAP_SUCCESS;
2647 }
2648
2649 /* This overlay is set up for dynamic loading via moduleload. For static
2650  * configuration, you'll need to arrange for the slap_overinst to be
2651  * initialized and registered by some other function inside slapd.
2652  */
2653
2654 static slap_overinst            syncprov;
2655
2656 int
2657 syncprov_initialize()
2658 {
2659         int rc;
2660
2661         rc = register_supported_control( LDAP_CONTROL_SYNC,
2662                 SLAP_CTRL_SEARCH, NULL,
2663                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2664         if ( rc != LDAP_SUCCESS ) {
2665                 Debug( LDAP_DEBUG_ANY,
2666                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2667                 return rc;
2668         }
2669
2670         syncprov.on_bi.bi_type = "syncprov";
2671         syncprov.on_bi.bi_db_init = syncprov_db_init;
2672         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2673         syncprov.on_bi.bi_db_open = syncprov_db_open;
2674         syncprov.on_bi.bi_db_close = syncprov_db_close;
2675
2676         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2677         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2678
2679         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2680         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2681         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2682         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2683         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2684         syncprov.on_bi.bi_op_search = syncprov_op_search;
2685         syncprov.on_bi.bi_extended = syncprov_op_extended;
2686         syncprov.on_bi.bi_operational = syncprov_operational;
2687
2688         syncprov.on_bi.bi_cf_ocs = spocs;
2689
2690         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2691
2692         rc = config_register_schema( spcfg, spocs );
2693         if ( rc ) return rc;
2694
2695         return overlay_register( &syncprov );
2696 }
2697
2698 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2699 int
2700 init_module( int argc, char *argv[] )
2701 {
2702         return syncprov_initialize();
2703 }
2704 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2705
2706 #endif /* defined(SLAPD_OVER_SYNCPROV) */