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