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                         fc_limits.lms_s_unchecked = 1;
 646                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 647                                 cf.f_av_value.bv_val );
 648                 }
 649                 fop.ors_attrsonly = 1;
 650                 fop.ors_attrs = slap_anlist_no_attrs;
 651                 fop.ors_slimit = 1;
 652                 cb.sc_private = NULL;
 653                 cb.sc_response = findcsn_cb;
 654                 break;
 655         case FIND_PRESENT:
 656                 fop.ors_filter = op->ors_filter;
 657                 fop.ors_filterstr = op->ors_filterstr;
 658                 fop.ors_attrsonly = 0;
 659                 fop.ors_attrs = uuid_anlist;
 660                 fop.ors_slimit = SLAP_NO_LIMIT;
 661                 cb.sc_private = &pcookie;
 662                 cb.sc_response = findpres_cb;
 663                 pcookie.num = 0;
 664
 665                 /* preallocate storage for a full set */
 666                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 667                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 668                         op->o_tmpmemctx );
 669                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 670                 pcookie.uuids[0].bv_val = pcookie.last;
 671                 pcookie.uuids[0].bv_len = UUID_LEN;
 672                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 673                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 674                         pcookie.uuids[i].bv_len = UUID_LEN;
 675                 }
 676                 break;
 677         }
 678
 679         fop.o_bd->bd_info = on->on_info->oi_orig;
 680         fop.o_bd->be_search( &fop, &frs );
 681         fop.o_bd->bd_info = (BackendInfo *)on;
 682
 683         switch( mode ) {
 684         case FIND_MAXCSN:
 685                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 686                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 687                 break;
 688         case FIND_CSN:
 689                 /* If matching CSN was not found, invalidate the context. */
 690                 if ( !cb.sc_private ) {
 691                         /* If we didn't find an exact match, then try for <= */
 692                         if ( findcsn_retry ) {
 693                                 findcsn_retry = 0;
 694                                 goto again;
 695                         }
 696                         rc = LDAP_NO_SUCH_OBJECT;
 697                 }
 698                 break;
 699         case FIND_PRESENT:
 700                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 701                 break;
 702         }
 703
 704         return rc;
 705 }
 706
 707 static void
 708 syncprov_free_syncop( syncops *so )
 709 {
 710         syncres *sr, *srnext;
 711         GroupAssertion *ga, *gnext;
 712
 713         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 714         if ( --so->s_inuse > 0 ) {
 715                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 716                 return;
 717         }
 718         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 719         if ( so->s_flags & PS_IS_DETACHED ) {
 720                 filter_free( so->s_op->ors_filter );
 721                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 722                         gnext = ga->ga_next;
 723                         ch_free( ga );
 724                 }
 725                 ch_free( so->s_op );
 726         }
 727         ch_free( so->s_base.bv_val );
 728         for ( sr=so->s_res; sr; sr=srnext ) {
 729                 srnext = sr->s_next;
 730                 ch_free( sr );
 731         }
 732         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 733         ch_free( so );
 734 }
 735
 736 /* Send a persistent search response */
 737 static int
 738 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 739         Entry **e, int mode )
 740 {
 741         slap_overinst *on = opc->son;
 742
 743         SlapReply rs = { REP_SEARCH };
 744         LDAPControl *ctrls[2];
 745         struct berval cookie;
 746         Entry e_uuid = {0};
 747         Attribute a_uuid = {0};
 748
 749         if ( so->s_op->o_abandon )
 750                 return SLAPD_ABANDON;
 751
 752         ctrls[1] = NULL;
 753         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 754
 755         e_uuid.e_attrs = &a_uuid;
 756         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 757         a_uuid.a_nvals = &opc->suuid;
 758         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 759                 mode, ctrls, 0, 1, &cookie );
 760         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 761
 762         rs.sr_ctrls = ctrls;
 763         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 764         switch( mode ) {
 765         case LDAP_SYNC_ADD:
 766                 rs.sr_entry = *e;
 767                 if ( rs.sr_entry->e_private )
 768                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 769                 if ( opc->sreference ) {
 770                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 771                         rs.sr_err = send_search_reference( op, &rs );
 772                         ber_bvarray_free( rs.sr_ref );
 773                         if ( !rs.sr_entry )
 774                                 *e = NULL;
 775                         break;
 776                 }
 777                 /* fallthru */
 778         case LDAP_SYNC_MODIFY:
 779                 rs.sr_entry = *e;
 780                 if ( rs.sr_entry->e_private )
 781                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 782                 rs.sr_attrs = op->ors_attrs;
 783                 rs.sr_err = send_search_entry( op, &rs );
 784                 if ( !rs.sr_entry )
 785                         *e = NULL;
 786                 break;
 787         case LDAP_SYNC_DELETE:
 788                 e_uuid.e_attrs = NULL;
 789                 e_uuid.e_name = opc->sdn;
 790                 e_uuid.e_nname = opc->sndn;
 791                 rs.sr_entry = &e_uuid;
 792                 if ( opc->sreference ) {
 793                         struct berval bv = BER_BVNULL;
 794                         rs.sr_ref = &bv;
 795                         rs.sr_err = send_search_reference( op, &rs );
 796                 } else {
 797                         rs.sr_err = send_search_entry( op, &rs );
 798                 }
 799                 break;
 800         default:
 801                 assert(0);
 802         }
 803         /* In case someone else freed it already? */
 804         if ( rs.sr_ctrls ) {
 805                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 806                 rs.sr_ctrls = NULL;
 807         }
 808
 809         return rs.sr_err;
 810 }
 811
 812 /* Play back queued responses */
 813 static int
 814 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 815 {
 816         syncres *sr;
 817         Entry *e;
 818         opcookie opc;
 819         int rc = 0;
 820
 821         opc.son = on;
 822
 823         for (;;) {
 824                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 825                 sr = so->s_res;
 826                 if ( sr )
 827                         so->s_res = sr->s_next;
 828                 if ( !so->s_res )
 829                         so->s_restail = NULL;
 830                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 831
 832                 if ( !sr || so->s_op->o_abandon )
 833                         break;
 834
 835                 opc.sdn = sr->s_dn;
 836                 opc.sndn = sr->s_ndn;
 837                 opc.suuid = sr->s_uuid;
 838                 opc.sctxcsn = sr->s_csn;
 839                 opc.sreference = sr->s_isreference;
 840                 e = NULL;
 841
 842                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 843                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 844                         if ( rc ) {
 845                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 846                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 847                                 ch_free( sr );
 848                                 rc = 0;
 849                                 continue;
 850                         }
 851                 }
 852                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 853
 854                 if ( e ) {
 855                         overlay_entry_release_ov( op, e, 0, on );
 856                 }
 857
 858                 ch_free( sr );
 859
 860                 if ( rc )
 861                         break;
 862         }
 863         return rc;
 864 }
 865
 866 /* runqueue task for playing back queued responses */
 867 static void *
 868 syncprov_qtask( void *ctx, void *arg )
 869 {
 870         struct re_s *rtask = arg;
 871         syncops *so = rtask->arg;
 872         slap_overinst *on = so->s_op->o_private;
 873         OperationBuffer opbuf;
 874         Operation *op;
 875         BackendDB be;
 876         int rc;
 877
 878         op = (Operation *) &opbuf;
 879         *op = *so->s_op;
 880         op->o_hdr = (Opheader *)(op+1);
 881         op->o_controls = (void **)(op->o_hdr+1);
 882         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 883
 884         *op->o_hdr = *so->s_op->o_hdr;
 885
 886         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 887         op->o_tmpmfuncs = &slap_sl_mfuncs;
 888         op->o_threadctx = ctx;
 889
 890         /* syncprov_qplay expects a fake db */
 891         be = *so->s_op->o_bd;
 892         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 893         op->o_bd = &be;
 894         op->o_private = NULL;
 895         op->o_callback = NULL;
 896
 897         rc = syncprov_qplay( op, on, so );
 898
 899         /* decrement use count... */
 900         syncprov_free_syncop( so );
 901
 902         /* wait until we get explicitly scheduled again */
 903         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 904         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 905         if ( rc == 0 ) {
 906                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 907         } else {
 908                 /* bail out on any error */
 909                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 910         }
 911         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 912
 913         return NULL;
 914 }
 915
 916 /* Start the task to play back queued psearch responses */
 917 static void
 918 syncprov_qstart( syncops *so )
 919 {
 920         int wake=0;
 921         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 922         if ( !so->s_qtask ) {
 923                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 924                         syncprov_qtask, so, "syncprov_qtask",
 925                         so->s_op->o_conn->c_peer_name.bv_val );
 926                 ++so->s_inuse;
 927                 wake = 1;
 928         } else {
 929                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 930                         !so->s_qtask->next_sched.tv_sec ) {
 931                         so->s_qtask->interval.tv_sec = 0;
 932                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 933                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 934                         ++so->s_inuse;
 935                         wake = 1;
 936                 }
 937         }
 938         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 939         if ( wake )
 940                 slap_wake_listener();
 941 }
 942
 943 /* Queue a persistent search response */
 944 static int
 945 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 946 {
 947         syncres *sr;
 948
 949         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 950                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 951         sr->s_next = NULL;
 952         sr->s_dn.bv_val = (char *)(sr + 1);
 953         sr->s_dn.bv_len = opc->sdn.bv_len;
 954         sr->s_mode = mode;
 955         sr->s_isreference = opc->sreference;
 956         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 957                  opc->sdn.bv_val ) + 1;
 958         sr->s_ndn.bv_len = opc->sndn.bv_len;
 959         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 960                  opc->sndn.bv_val ) + 1;
 961         sr->s_uuid.bv_len = opc->suuid.bv_len;
 962         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 963         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 964         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 965         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 966
 967         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 968         if ( !so->s_res ) {
 969                 so->s_res = sr;
 970         } else {
 971                 so->s_restail->s_next = sr;
 972         }
 973         so->s_restail = sr;
 974
 975         /* If the base of the psearch was modified, check it next time round */
 976         if ( so->s_flags & PS_WROTE_BASE ) {
 977                 so->s_flags ^= PS_WROTE_BASE;
 978                 so->s_flags |= PS_FIND_BASE;
 979         }
 980         if ( so->s_flags & PS_IS_DETACHED ) {
 981                 syncprov_qstart( so );
 982         }
 983         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 984         return LDAP_SUCCESS;
 985 }
 986
 987 static int
 988 syncprov_drop_psearch( syncops *so, int lock )
 989 {
 990         if ( so->s_flags & PS_IS_DETACHED ) {
 991                 if ( lock )
 992                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 993                 so->s_op->o_conn->c_n_ops_executing--;
 994                 so->s_op->o_conn->c_n_ops_completed++;
 995                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 996                         o_next );
 997                 if ( lock )
 998                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 999         }
1000         syncprov_free_syncop( so );
1001
1002         return 0;
1003 }
1004
1005 static int
1006 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1007 {
1008         slap_callback *sc = op->o_callback;
1009         op->o_callback = sc->sc_next;
1010         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1011         op->o_tmpfree( sc, op->o_tmpmemctx );
1012         return 0;
1013 }
1014
1015 static int
1016 syncprov_op_abandon( Operation *op, SlapReply *rs )
1017 {
1018         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1019         syncprov_info_t         *si = on->on_bi.bi_private;
1020         syncops *so, *soprev;
1021
1022         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1023         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1024                 soprev=so, so=so->s_next ) {
1025                 if ( so->s_op->o_connid == op->o_connid &&
1026                         so->s_op->o_msgid == op->orn_msgid ) {
1027                                 so->s_op->o_abandon = 1;
1028                                 soprev->s_next = so->s_next;
1029                                 break;
1030                 }
1031         }
1032         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1033         if ( so ) {
1034                 /* Is this really a Cancel exop? */
1035                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1036                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1037                         rs->sr_err = LDAP_CANCELLED;
1038                         send_ldap_result( so->s_op, rs );
1039                         if ( so->s_flags & PS_IS_DETACHED ) {
1040                                 slap_callback *cb;
1041                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1042                                 cb->sc_cleanup = syncprov_ab_cleanup;
1043                                 cb->sc_next = op->o_callback;
1044                                 cb->sc_private = so;
1045                                 return SLAP_CB_CONTINUE;
1046                         }
1047                 }
1048                 syncprov_drop_psearch( so, 0 );
1049         }
1050         return SLAP_CB_CONTINUE;
1051 }
1052
1053 /* Find which persistent searches are affected by this operation */
1054 static void
1055 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1056 {
1057         slap_overinst *on = opc->son;
1058         syncprov_info_t         *si = on->on_bi.bi_private;
1059
1060         fbase_cookie fc;
1061         syncops *ss, *sprev, *snext;
1062         Entry *e = NULL;
1063         Attribute *a;
1064         int rc;
1065         struct berval newdn;
1066         int freefdn = 0;
1067         BackendDB *b0 = op->o_bd, db;
1068
1069         fc.fdn = &op->o_req_ndn;
1070         /* compute new DN */
1071         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1072                 struct berval pdn;
1073                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1074                 else dnParent( fc.fdn, &pdn );
1075                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1076                 fc.fdn = &newdn;
1077                 freefdn = 1;
1078         }
1079         if ( op->o_tag != LDAP_REQ_ADD ) {
1080                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1081                         db = *op->o_bd;
1082                         op->o_bd = &db;
1083                 }
1084                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1085                 /* If we're sending responses now, make a copy and unlock the DB */
1086                 if ( e && !saveit ) {
1087                         Entry *e2 = entry_dup( e );
1088                         overlay_entry_release_ov( op, e, 0, on );
1089                         e = e2;
1090                 }
1091                 if ( rc ) {
1092                         op->o_bd = b0;
1093                         return;
1094                 }
1095         } else {
1096                 e = op->ora_e;
1097         }
1098
1099         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1100                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1101                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1102                 opc->sreference = is_entry_referral( e );
1103                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1104                 if ( a )
1105                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1106         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1107                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1108                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1109                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1110                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1111         }
1112
1113         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1114         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1115                 sprev = ss, ss=snext)
1116         {
1117                 syncmatches *sm;
1118                 int found = 0;
1119
1120                 snext = ss->s_next;
1121                 /* validate base */
1122                 fc.fss = ss;
1123                 fc.fbase = 0;
1124                 fc.fscope = 0;
1125
1126                 /* If the base of the search is missing, signal a refresh */
1127                 rc = syncprov_findbase( op, &fc );
1128                 if ( rc != LDAP_SUCCESS ) {
1129                         SlapReply rs = {REP_RESULT};
1130                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1131                                 "search base has changed" );
1132                         sprev->s_next = snext;
1133                         syncprov_drop_psearch( ss, 1 );
1134                         ss = sprev;
1135                         continue;
1136                 }
1137
1138
1139                 /* If we're sending results now, look for this op in old matches */
1140                 if ( !saveit ) {
1141                         syncmatches *old;
1142
1143                         /* Did we modify the search base? */
1144                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1145                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1146                                 ss->s_flags |= PS_WROTE_BASE;
1147                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1148                         }
1149
1150                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1151                                 old=sm, sm=sm->sm_next ) {
1152                                 if ( sm->sm_op == ss ) {
1153                                         found = 1;
1154                                         old->sm_next = sm->sm_next;
1155                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1156                                         break;
1157                                 }
1158                         }
1159                 }
1160
1161                 /* check if current o_req_dn is in scope and matches filter */
1162                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1163                         LDAP_COMPARE_TRUE ) {
1164                         if ( saveit ) {
1165                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1166                                 sm->sm_next = opc->smatches;
1167                                 sm->sm_op = ss;
1168                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1169                                 ++ss->s_inuse;
1170                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1171                                 opc->smatches = sm;
1172                         } else {
1173                                 /* if found send UPDATE else send ADD */
1174                                 syncprov_qresp( opc, ss,
1175                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1176                         }
1177                 } else if ( !saveit && found ) {
1178                         /* send DELETE */
1179                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1180                 }
1181         }
1182         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1183
1184         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1185                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1186                 be_entry_release_rw( op, e, 0 );
1187                 op->o_bd->bd_info = (BackendInfo *)on;
1188         }
1189         if ( freefdn ) {
1190                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1191         }
1192         op->o_bd = b0;
1193 }
1194
1195 static int
1196 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1197 {
1198         slap_callback *cb = op->o_callback;
1199         opcookie *opc = cb->sc_private;
1200         slap_overinst *on = opc->son;
1201         syncprov_info_t         *si = on->on_bi.bi_private;
1202         syncmatches *sm, *snext;
1203         modtarget *mt, mtdummy;
1204
1205         for (sm = opc->smatches; sm; sm=snext) {
1206                 snext = sm->sm_next;
1207                 syncprov_free_syncop( sm->sm_op );
1208                 op->o_tmpfree( sm, op->o_tmpmemctx );
1209         }
1210
1211         /* Remove op from lock table */
1212         mtdummy.mt_op = op;
1213         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1214         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1215         if ( mt ) {
1216                 modinst *mi = mt->mt_mods;
1217
1218                 /* If there are more, promote the next one */
1219                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1220                 if ( mi->mi_next ) {
1221                         mt->mt_mods = mi->mi_next;
1222                         mt->mt_op = mt->mt_mods->mi_op;
1223                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1224                 } else {
1225                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1226                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1227                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1228                         ch_free( mt );
1229                 }
1230         }
1231         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1232         if ( !BER_BVISNULL( &opc->suuid ))
1233                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1234         if ( !BER_BVISNULL( &opc->sndn ))
1235                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1236         if ( !BER_BVISNULL( &opc->sdn ))
1237                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1238         op->o_callback = cb->sc_next;
1239         op->o_tmpfree(cb, op->o_tmpmemctx);
1240
1241         return 0;
1242 }
1243
1244 static void
1245 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1246 {
1247         syncprov_info_t         *si = on->on_bi.bi_private;
1248         Modifications mod;
1249         Operation opm;
1250         SlapReply rsm = { 0 };
1251         struct berval bv[2];
1252         slap_callback cb = {0};
1253
1254         /* If ctxcsn is empty, delete it */
1255         if ( BER_BVISEMPTY( &si->si_ctxcsn )) {
1256                 mod.sml_values = NULL;
1257         } else {
1258                 mod.sml_values = bv;
1259                 bv[1].bv_val = NULL;
1260                 bv[0] = si->si_ctxcsn;
1261         }
1262         mod.sml_nvalues = NULL;
1263         mod.sml_desc = slap_schema.si_ad_contextCSN;
1264         mod.sml_op = LDAP_MOD_REPLACE;
1265         mod.sml_flags = 0;
1266         mod.sml_next = NULL;
1267
1268         cb.sc_response = slap_null_cb;
1269         opm = *op;
1270         opm.o_tag = LDAP_REQ_MODIFY;
1271         opm.o_callback = &cb;
1272         opm.orm_modlist = &mod;
1273         opm.o_req_dn = op->o_bd->be_suffix[0];
1274         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1275         opm.o_bd->bd_info = on->on_info->oi_orig;
1276         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1277         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1278         opm.o_bd->be_modify( &opm, &rsm );
1279         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1280         if ( mod.sml_next != NULL ) {
1281                 slap_mods_free( mod.sml_next, 1 );
1282         }
1283 }
1284
1285 static void
1286 syncprov_add_slog( Operation *op )
1287 {
1288         opcookie *opc = op->o_callback->sc_private;
1289         slap_overinst *on = opc->son;
1290         syncprov_info_t         *si = on->on_bi.bi_private;
1291         sessionlog *sl;
1292         slog_entry *se;
1293
1294         sl = si->si_logs;
1295         {
1296                 /* Allocate a record. UUIDs are not NUL-terminated. */
1297                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1298                         op->o_csn.bv_len + 1 );
1299                 se->se_next = NULL;
1300                 se->se_tag = op->o_tag;
1301
1302                 se->se_uuid.bv_val = (char *)(&se[1]);
1303                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1304                 se->se_uuid.bv_len = opc->suuid.bv_len;
1305
1306                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1307                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1308                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1309                 se->se_csn.bv_len = op->o_csn.bv_len;
1310
1311                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1312                 if ( sl->sl_head ) {
1313                         sl->sl_tail->se_next = se;
1314                 } else {
1315                         sl->sl_head = se;
1316                 }
1317                 sl->sl_tail = se;
1318                 sl->sl_num++;
1319                 while ( sl->sl_num > sl->sl_size ) {
1320                         se = sl->sl_head;
1321                         sl->sl_head = se->se_next;
1322                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1323                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1324                         ch_free( se );
1325                         sl->sl_num--;
1326                 }
1327                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1328         }
1329 }
1330
1331 /* Just set a flag if we found the matching entry */
1332 static int
1333 playlog_cb( Operation *op, SlapReply *rs )
1334 {
1335         if ( rs->sr_type == REP_SEARCH ) {
1336                 op->o_callback->sc_private = (void *)1;
1337         }
1338         return rs->sr_err;
1339 }
1340
1341 /* enter with sl->sl_mutex locked, release before returning */
1342 static void
1343 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1344         sync_control *srs, struct berval *ctxcsn )
1345 {
1346         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1347         slog_entry *se;
1348         int i, j, ndel, num, nmods, mmods;
1349         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1350         BerVarray uuids;
1351         struct berval delcsn;
1352
1353         if ( !sl->sl_num ) {
1354                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1355                 return;
1356         }
1357
1358         num = sl->sl_num;
1359         i = 0;
1360         nmods = 0;
1361
1362         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1363                 num * UUID_LEN, op->o_tmpmemctx );
1364         uuids[0].bv_val = (char *)(uuids + num + 1);
1365
1366         delcsn.bv_len = 0;
1367         delcsn.bv_val = cbuf;
1368
1369         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1370          * and everything else at the end. Do this first so we can
1371          * unlock the list mutex.
1372          */
1373         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n", srs->sr_state.ctxcsn.bv_val, 0, 0 );
1374         for ( se=sl->sl_head; se; se=se->se_next ) {
1375                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1376                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn );
1377                 if ( ndel <= 0 ) {
1378                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1379                         continue;
1380                 }
1381                 ndel = ber_bvcmp( &se->se_csn, ctxcsn );
1382                 if ( ndel > 0 ) {
1383                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1384                         break;
1385                 }
1386                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1387                         j = i;
1388                         i++;
1389                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1390                         delcsn.bv_len = se->se_csn.bv_len;
1391                         delcsn.bv_val[delcsn.bv_len] = '\0';
1392                 } else {
1393                         nmods++;
1394                         j = num - nmods;
1395                 }
1396                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1397                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1398                 uuids[j].bv_len = UUID_LEN;
1399         }
1400         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1401
1402         ndel = i;
1403
1404         /* Zero out unused slots */
1405         for ( i=ndel; i < num - nmods; i++ )
1406                 uuids[i].bv_len = 0;
1407
1408         /* Mods must be validated to see if they belong in this delete set.
1409          */
1410
1411         mmods = nmods;
1412         /* Strip any duplicates */
1413         for ( i=0; i<nmods; i++ ) {
1414                 for ( j=0; j<ndel; j++ ) {
1415                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1416                                 uuids[num - 1 - i].bv_len = 0;
1417                                 mmods --;
1418                                 break;
1419                         }
1420                 }
1421                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1422                 for ( j=0; j<i; j++ ) {
1423                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1424                                 uuids[num - 1 - i].bv_len = 0;
1425                                 mmods --;
1426                                 break;
1427                         }
1428                 }
1429         }
1430
1431         if ( mmods ) {
1432                 Operation fop;
1433                 SlapReply frs = { REP_RESULT };
1434                 int rc;
1435                 Filter mf, af;
1436 #ifdef LDAP_COMP_MATCH
1437                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1438 #else
1439                 AttributeAssertion eq;
1440 #endif
1441                 slap_callback cb = {0};
1442
1443                 fop = *op;
1444
1445                 fop.o_sync_mode = 0;
1446                 fop.o_callback = &cb;
1447                 fop.ors_limit = NULL;
1448                 fop.ors_tlimit = SLAP_NO_LIMIT;
1449                 fop.ors_attrs = slap_anlist_all_attributes;
1450                 fop.ors_attrsonly = 0;
1451                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1452
1453                 af.f_choice = LDAP_FILTER_AND;
1454                 af.f_next = NULL;
1455                 af.f_and = &mf;
1456                 mf.f_choice = LDAP_FILTER_EQUALITY;
1457                 mf.f_ava = &eq;
1458                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1459                 mf.f_next = fop.ors_filter;
1460
1461                 fop.ors_filter = &af;
1462
1463                 cb.sc_response = playlog_cb;
1464                 fop.o_bd->bd_info = on->on_info->oi_orig;
1465
1466                 for ( i=ndel; i<num; i++ ) {
1467                         if ( uuids[i].bv_len == 0 ) continue;
1468
1469                         mf.f_av_value = uuids[i];
1470                         cb.sc_private = NULL;
1471                         fop.ors_slimit = 1;
1472                         frs.sr_nentries = 0;
1473                         rc = fop.o_bd->be_search( &fop, &frs );
1474
1475                         /* If entry was not found, add to delete list */
1476                         if ( !cb.sc_private ) {
1477                                 uuids[ndel++] = uuids[i];
1478                         }
1479                 }
1480                 fop.o_bd->bd_info = (BackendInfo *)on;
1481         }
1482         if ( ndel ) {
1483                 struct berval cookie;
1484
1485                 slap_compose_sync_cookie( op, &cookie, &delcsn, srs->sr_state.rid );
1486                 uuids[ndel].bv_val = NULL;
1487                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1488                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1489         }
1490         op->o_tmpfree( uuids, op->o_tmpmemctx );
1491 }
1492
1493 static int
1494 syncprov_op_response( Operation *op, SlapReply *rs )
1495 {
1496         opcookie *opc = op->o_callback->sc_private;
1497         slap_overinst *on = opc->son;
1498         syncprov_info_t         *si = on->on_bi.bi_private;
1499         syncmatches *sm;
1500
1501         if ( rs->sr_err == LDAP_SUCCESS )
1502         {
1503                 struct berval maxcsn = BER_BVNULL;
1504                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1505                 int do_check=0;
1506
1507                 /* Update our context CSN */
1508                 cbuf[0] = '\0';
1509                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1510                 slap_get_commit_csn( op, &maxcsn );
1511                 if ( !BER_BVISNULL( &maxcsn ) ) {
1512                         strcpy( cbuf, maxcsn.bv_val );
1513                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1514                                 strcpy( si->si_ctxcsnbuf, cbuf );
1515                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1516                         }
1517                 }
1518
1519                 /* Don't do any processing for consumer contextCSN updates */
1520                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1521                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1522                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1523                         return SLAP_CB_CONTINUE;
1524                 }
1525
1526                 si->si_numops++;
1527                 if ( si->si_chkops || si->si_chktime ) {
1528                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1529                                 do_check = 1;
1530                                 si->si_numops = 0;
1531                         }
1532                         if ( si->si_chktime &&
1533                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1534                                 do_check = 1;
1535                                 si->si_chklast = op->o_time;
1536                         }
1537                 }
1538                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1539
1540                 if ( do_check ) {
1541                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1542                         syncprov_checkpoint( op, rs, on );
1543                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1544                 }
1545
1546                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1547                 opc->sctxcsn.bv_val = cbuf;
1548
1549                 /* Handle any persistent searches */
1550                 if ( si->si_ops ) {
1551                         switch(op->o_tag) {
1552                         case LDAP_REQ_ADD:
1553                         case LDAP_REQ_MODIFY:
1554                         case LDAP_REQ_MODRDN:
1555                         case LDAP_REQ_EXTENDED:
1556                                 syncprov_matchops( op, opc, 0 );
1557                                 break;
1558                         case LDAP_REQ_DELETE:
1559                                 /* for each match in opc->smatches:
1560                                  *   send DELETE msg
1561                                  */
1562                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1563                                         if ( sm->sm_op->s_op->o_abandon )
1564                                                 continue;
1565                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1566                                 }
1567                                 break;
1568                         }
1569                 }
1570
1571                 /* Add any log records */
1572                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1573                         syncprov_add_slog( op );
1574                 }
1575
1576         }
1577         return SLAP_CB_CONTINUE;
1578 }
1579
1580 /* We don't use a subentry to store the context CSN any more.
1581  * We expose the current context CSN as an operational attribute
1582  * of the suffix entry.
1583  */
1584 static int
1585 syncprov_op_compare( Operation *op, SlapReply *rs )
1586 {
1587         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1588         syncprov_info_t         *si = on->on_bi.bi_private;
1589         int rc = SLAP_CB_CONTINUE;
1590
1591         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1592                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1593         {
1594                 Entry e = {0};
1595                 Attribute a = {0};
1596                 struct berval bv[2];
1597
1598                 e.e_name = op->o_bd->be_suffix[0];
1599                 e.e_nname = op->o_bd->be_nsuffix[0];
1600
1601                 BER_BVZERO( &bv[1] );
1602                 bv[0] = si->si_ctxcsn;
1603
1604                 a.a_desc = slap_schema.si_ad_contextCSN;
1605                 a.a_vals = bv;
1606                 a.a_nvals = a.a_vals;
1607
1608                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1609
1610                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1611                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1612                 if ( ! rs->sr_err ) {
1613                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1614                         goto return_results;
1615                 }
1616
1617                 if ( get_assert( op ) &&
1618                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1619                 {
1620                         rs->sr_err = LDAP_ASSERTION_FAILED;
1621                         goto return_results;
1622                 }
1623
1624
1625                 rs->sr_err = LDAP_COMPARE_FALSE;
1626
1627                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1628                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1629                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1630                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1631                 {
1632                         rs->sr_err = LDAP_COMPARE_TRUE;
1633                 }
1634
1635 return_results:;
1636
1637                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1638
1639                 send_ldap_result( op, rs );
1640
1641                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1642                         rs->sr_err = LDAP_SUCCESS;
1643                 }
1644                 rc = rs->sr_err;
1645         }
1646
1647         return rc;
1648 }
1649
1650 static int
1651 syncprov_op_mod( Operation *op, SlapReply *rs )
1652 {
1653         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1654         syncprov_info_t         *si = on->on_bi.bi_private;
1655
1656         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1657                 sizeof(opcookie) +
1658                 (si->si_ops ? sizeof(modinst) : 0 ),
1659                 op->o_tmpmemctx);
1660         opcookie *opc = (opcookie *)(cb+1);
1661         opc->son = on;
1662         cb->sc_response = syncprov_op_response;
1663         cb->sc_cleanup = syncprov_op_cleanup;
1664         cb->sc_private = opc;
1665         cb->sc_next = op->o_callback;
1666         op->o_callback = cb;
1667
1668         /* If there are active persistent searches, lock this operation.
1669          * See seqmod.c for the locking logic on its own.
1670          */
1671         if ( si->si_ops ) {
1672                 modtarget *mt, mtdummy;
1673                 modinst *mi;
1674
1675                 mi = (modinst *)(opc+1);
1676                 mi->mi_op = op;
1677
1678                 /* See if we're already modifying this entry... */
1679                 mtdummy.mt_op = op;
1680                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1681                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1682                 if ( mt ) {
1683                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1684                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1685                         mt->mt_tail->mi_next = mi;
1686                         mt->mt_tail = mi;
1687                         /* wait for this op to get to head of list */
1688                         while ( mt->mt_mods != mi ) {
1689                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1690                                 ldap_pvt_thread_yield();
1691                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1692
1693                                 /* clean up if the caller is giving up */
1694                                 if ( op->o_abandon ) {
1695                                         modinst *m2;
1696                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1697                                                 m2 = m2->mi_next );
1698                                         m2->mi_next = mi->mi_next;
1699                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1700                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1701                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1702                                         return SLAPD_ABANDON;
1703                                 }
1704                         }
1705                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1706                 } else {
1707                         /* Record that we're modifying this entry now */
1708                         mt = ch_malloc( sizeof(modtarget) );
1709                         mt->mt_mods = mi;
1710                         mt->mt_tail = mi;
1711                         mt->mt_op = mi->mi_op;
1712                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1713                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1714                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1715                 }
1716         }
1717
1718         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1719                 syncprov_matchops( op, opc, 1 );
1720
1721         return SLAP_CB_CONTINUE;
1722 }
1723
1724 static int
1725 syncprov_op_extended( Operation *op, SlapReply *rs )
1726 {
1727         if ( exop_is_write( op ))
1728                 return syncprov_op_mod( op, rs );
1729
1730         return SLAP_CB_CONTINUE;
1731 }
1732
1733 typedef struct searchstate {
1734         slap_overinst *ss_on;
1735         syncops *ss_so;
1736         int ss_present;
1737         struct berval ss_ctxcsn;
1738         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1739 } searchstate;
1740
1741 static int
1742 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1743 {
1744         if ( rs->sr_ctrls ) {
1745                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1746                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1747                 rs->sr_ctrls = NULL;
1748         }
1749         return 0;
1750 }
1751
1752 static void
1753 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1754 {
1755         Operation *op2;
1756         int i, alen = 0;
1757         size_t size;
1758         char *ptr;
1759         GroupAssertion *g1, *g2;
1760
1761         /* count the search attrs */
1762         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1763                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1764         }
1765         /* Make a new copy of the operation */
1766         size = sizeof(Operation) + sizeof(Opheader) +
1767                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1768                 op->o_req_dn.bv_len + 1 +
1769                 op->o_req_ndn.bv_len + 1 +
1770                 op->o_ndn.bv_len + 1 +
1771                 so->s_filterstr.bv_len + 1;
1772         op2 = (Operation *)ch_calloc( 1, size );
1773         op2->o_hdr = (Opheader *)(op2+1);
1774
1775         /* Copy the fields we care about explicitly, leave the rest alone */
1776         *op2->o_hdr = *op->o_hdr;
1777         op2->o_tag = op->o_tag;
1778         op2->o_time = op->o_time;
1779         op2->o_bd = on->on_info->oi_origdb;
1780         op2->o_request = op->o_request;
1781         op2->o_private = on;
1782
1783         if ( i ) {
1784                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1785                 ptr = (char *)(op2->ors_attrs+i+1);
1786                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1787                         op2->ors_attrs[i] = op->ors_attrs[i];
1788                         op2->ors_attrs[i].an_name.bv_val = ptr;
1789                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1790                 }
1791                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1792         } else {
1793                 ptr = (char *)(op2->o_hdr + 1);
1794         }
1795         op2->o_authz = op->o_authz;
1796         op2->o_ndn.bv_val = ptr;
1797         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1798         op2->o_dn = op2->o_ndn;
1799         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1800         op2->o_req_dn.bv_val = ptr;
1801         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1802         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1803         op2->o_req_ndn.bv_val = ptr;
1804         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1805         op2->ors_filterstr.bv_val = ptr;
1806         strcpy( ptr, so->s_filterstr.bv_val );
1807         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1808
1809         /* Skip the AND/GE clause that we stuck on in front */
1810         if ( so->s_flags & PS_FIX_FILTER ) {
1811                 op2->ors_filter = op->ors_filter->f_and->f_next;
1812                 so->s_flags ^= PS_FIX_FILTER;
1813         } else {
1814                 op2->ors_filter = op->ors_filter;
1815         }
1816         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1817         so->s_op = op2;
1818
1819         /* Copy any cached group ACLs individually */
1820         op2->o_groups = NULL;
1821         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1822                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1823                 *g2 = *g1;
1824                 strcpy( g2->ga_ndn, g1->ga_ndn );
1825                 g2->ga_next = op2->o_groups;
1826                 op2->o_groups = g2;
1827         }
1828         /* Don't allow any further group caching */
1829         op2->o_do_not_cache = 1;
1830
1831         /* Add op2 to conn so abandon will find us */
1832         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1833         op->o_conn->c_n_ops_executing++;
1834         op->o_conn->c_n_ops_completed--;
1835         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1836         so->s_flags |= PS_IS_DETACHED;
1837         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1838
1839         /* Prevent anyone else from trying to send a result for this op */
1840         op->o_abandon = 1;
1841 }
1842
1843 static int
1844 syncprov_search_response( Operation *op, SlapReply *rs )
1845 {
1846         searchstate *ss = op->o_callback->sc_private;
1847         slap_overinst *on = ss->ss_on;
1848         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1849
1850         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1851                 Attribute *a;
1852                 /* If we got a referral without a referral object, there's
1853                  * something missing that we cannot replicate. Just ignore it.
1854                  * The consumer will abort because we didn't send the expected
1855                  * control.
1856                  */
1857                 if ( !rs->sr_entry ) {
1858                         assert( rs->sr_entry != NULL );
1859                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1860                         return SLAP_CB_CONTINUE;
1861                 }
1862                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1863                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1864                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1865                 }
1866                 if ( a ) {
1867                         /* Make sure entry is less than the snapshot'd contextCSN */
1868                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 ) {
1869                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s greater than snapshot %s\n",
1870                                         rs->sr_entry->e_name.bv_val,
1871                                         a->a_nvals[0].bv_val,
1872                                         ss->ss_ctxcsn.bv_val );
1873                                 return LDAP_SUCCESS;
1874                         }
1875
1876                         /* Don't send the ctx entry twice */
1877                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1878                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) ) {
1879                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s matches ctx %s\n",
1880                                         rs->sr_entry->e_name.bv_val,
1881                                         a->a_nvals[0].bv_val,
1882                                         srs->sr_state.ctxcsn.bv_val );
1883                                 return LDAP_SUCCESS;
1884                         }
1885                 }
1886                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1887                         op->o_tmpmemctx );
1888                 rs->sr_ctrls[1] = NULL;
1889                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1890                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1891         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1892                 struct berval cookie;
1893
1894                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1895                         srs->sr_state.rid );
1896
1897                 /* Is this a regular refresh? */
1898                 if ( !ss->ss_so ) {
1899                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1900                                 op->o_tmpmemctx );
1901                         rs->sr_ctrls[1] = NULL;
1902                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1903                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1904                                         LDAP_SYNC_REFRESH_DELETES );
1905                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1906                 } else {
1907                 /* It's RefreshAndPersist, transition to Persist phase */
1908                         syncprov_sendinfo( op, rs, ss->ss_present ?
1909                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1910                                 &cookie, 1, NULL, 0 );
1911                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1912
1913                         /* Detach this Op from frontend control */
1914                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1915
1916                         /* Turn off the refreshing flag */
1917                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1918
1919                         syncprov_detach_op( op, ss->ss_so, on );
1920
1921                         /* If there are queued responses, fire them off */
1922                         if ( ss->ss_so->s_res )
1923                                 syncprov_qstart( ss->ss_so );
1924                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1925
1926                         return LDAP_SUCCESS;
1927                 }
1928         }
1929
1930         return SLAP_CB_CONTINUE;
1931 }
1932
1933 static int
1934 syncprov_op_search( Operation *op, SlapReply *rs )
1935 {
1936         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1937         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1938         slap_callback   *cb;
1939         int gotstate = 0, nochange = 0, do_present;
1940         syncops *sop = NULL;
1941         searchstate *ss;
1942         sync_control *srs;
1943         struct berval ctxcsn;
1944         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1945
1946         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1947
1948         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1949                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1950                 return rs->sr_err;
1951         }
1952
1953         do_present = si->si_nopres ? 0 : 1;
1954
1955         srs = op->o_controls[slap_cids.sc_LDAPsync];
1956         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1957
1958         /* If this is a persistent search, set it up right away */
1959         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1960                 syncops so = {0};
1961                 fbase_cookie fc;
1962                 opcookie opc;
1963                 slap_callback sc;
1964
1965                 fc.fss = &so;
1966                 fc.fbase = 0;
1967                 so.s_eid = NOID;
1968                 so.s_op = op;
1969                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1970                 /* syncprov_findbase expects to be called as a callback... */
1971                 sc.sc_private = &opc;
1972                 opc.son = on;
1973                 ldap_pvt_thread_mutex_init( &so.s_mutex );
1974                 cb = op->o_callback;
1975                 op->o_callback = &sc;
1976                 rs->sr_err = syncprov_findbase( op, &fc );
1977                 op->o_callback = cb;
1978                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
1979
1980                 if ( rs->sr_err != LDAP_SUCCESS ) {
1981                         send_ldap_result( op, rs );
1982                         return rs->sr_err;
1983                 }
1984                 sop = ch_malloc( sizeof( syncops ));
1985                 *sop = so;
1986                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1987                 sop->s_rid = srs->sr_state.rid;
1988                 sop->s_inuse = 1;
1989
1990                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1991                 sop->s_next = si->si_ops;
1992                 si->si_ops = sop;
1993                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1994         }
1995
1996         /* snapshot the ctxcsn */
1997         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1998         strcpy( csnbuf, si->si_ctxcsnbuf );
1999         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
2000         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2001         ctxcsn.bv_val = csnbuf;
2002
2003         /* If we have a cookie, handle the PRESENT lookups */
2004         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
2005                 sessionlog *sl;
2006
2007                 /* The cookie was validated when it was parsed, just use it */
2008
2009                 /* If just Refreshing and nothing has changed, shortcut it */
2010                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
2011                         nochange = 1;
2012                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2013                                 LDAPControl     *ctrls[2];
2014
2015                                 ctrls[0] = NULL;
2016                                 ctrls[1] = NULL;
2017                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2018                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2019                                 rs->sr_ctrls = ctrls;
2020                                 rs->sr_err = LDAP_SUCCESS;
2021                                 send_ldap_result( op, rs );
2022                                 rs->sr_ctrls = NULL;
2023                                 return rs->sr_err;
2024                         }
2025                         goto shortcut;
2026                 }
2027                 /* Do we have a sessionlog for this search? */
2028                 sl=si->si_logs;
2029                 if ( sl ) {
2030                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2031                         /* Are there any log entries, and is the consumer state
2032                          * present in the session log?
2033                          */
2034                         if ( sl->sl_num > 0 && ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
2035                                 do_present = 0;
2036                                 /* mutex is unlocked in playlog */
2037                                 syncprov_playlog( op, rs, sl, srs, &ctxcsn );
2038                         } else {
2039                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2040                         }
2041                 }
2042                 /* Is the CSN still present in the database? */
2043                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2044                         /* No, so a reload is required */
2045                         /* the 2.2 consumer doesn't send this hint */
2046                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2047                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2048                                 return rs->sr_err;
2049                         }
2050                 } else {
2051                         gotstate = 1;
2052                         /* If changed and doing Present lookup, send Present UUIDs */
2053                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2054                                 LDAP_SUCCESS ) {
2055                                 send_ldap_result( op, rs );
2056                                 return rs->sr_err;
2057                         }
2058                 }
2059         }
2060
2061 shortcut:
2062         /* Append CSN range to search filter, save original filter
2063          * for persistent search evaluation
2064          */
2065         if ( sop ) {
2066                 sop->s_filterstr= op->ors_filterstr;
2067         }
2068
2069         /* If something changed, find the changes */
2070         if ( gotstate && !nochange ) {
2071                 Filter *fand, *fava;
2072
2073                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2074                 fand->f_choice = LDAP_FILTER_AND;
2075                 fand->f_next = NULL;
2076                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2077                 fand->f_and = fava;
2078                 fava->f_choice = LDAP_FILTER_GE;
2079                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2080                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2081 #ifdef LDAP_COMP_MATCH
2082                 fava->f_ava->aa_cf = NULL;
2083 #endif
2084                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2085                 fava->f_next = op->ors_filter;
2086                 op->ors_filter = fand;
2087                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2088                 if ( sop )
2089                         sop->s_flags |= PS_FIX_FILTER;
2090         }
2091
2092         /* Let our callback add needed info to returned entries */
2093         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2094         ss = (searchstate *)(cb+1);
2095         ss->ss_on = on;
2096         ss->ss_so = sop;
2097         ss->ss_present = do_present;
2098         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2099         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2100         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2101         cb->sc_response = syncprov_search_response;
2102         cb->sc_cleanup = syncprov_search_cleanup;
2103         cb->sc_private = ss;
2104         cb->sc_next = op->o_callback;
2105         op->o_callback = cb;
2106
2107 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2108         op->o_sync_mode &= SLAP_CONTROL_MASK;
2109 #endif
2110
2111         /* If this is a persistent search and no changes were reported during
2112          * the refresh phase, just invoke the response callback to transition
2113          * us into persist phase
2114          */
2115         if ( nochange ) {
2116                 rs->sr_err = LDAP_SUCCESS;
2117                 rs->sr_nentries = 0;
2118                 send_ldap_result( op, rs );
2119                 return rs->sr_err;
2120         }
2121         return SLAP_CB_CONTINUE;
2122 }
2123
2124 static int
2125 syncprov_operational(
2126         Operation *op,
2127         SlapReply *rs )
2128 {
2129         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2130         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2131
2132         if ( rs->sr_entry &&
2133                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2134
2135                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2136                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2137                         Attribute *a, **ap = NULL;
2138
2139                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2140                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2141                                         break;
2142                         }
2143
2144                         if ( !a ) {
2145                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2146
2147                                 a = ch_malloc( sizeof(Attribute));
2148                                 a->a_desc = slap_schema.si_ad_contextCSN;
2149                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2150                                 a->a_vals[1].bv_val = NULL;
2151                                 a->a_nvals = a->a_vals;
2152                                 a->a_next = NULL;
2153                                 a->a_flags = 0;
2154                                 *ap = a;
2155                         }
2156
2157                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2158                         if ( !ap ) {
2159                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2160                         } else {
2161                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2162                         }
2163                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2164                 }
2165         }
2166         return SLAP_CB_CONTINUE;
2167 }
2168
2169 enum {
2170         SP_CHKPT = 1,
2171         SP_SESSL,
2172         SP_NOPRES,
2173         SP_USEHINT
2174 };
2175
2176 static ConfigDriver sp_cf_gen;
2177
2178 static ConfigTable spcfg[] = {
2179         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2180                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2181                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2182                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2183         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2184                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2185                         "DESC 'Session log size in ops' "
2186                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2187         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2188                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2189                         "DESC 'Omit Present phase processing' "
2190                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2191         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2192                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2193                         "DESC 'Observe Reload Hint in Request control' "
2194                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2195         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2196 };
2197
2198 static ConfigOCs spocs[] = {
2199         { "( OLcfgOvOc:1.1 "
2200                 "NAME 'olcSyncProvConfig' "
2201                 "DESC 'SyncRepl Provider configuration' "
2202                 "SUP olcOverlayConfig "
2203                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2204                         Cft_Overlay, spcfg },
2205         { NULL, 0, NULL }
2206 };
2207
2208 static int
2209 sp_cf_gen(ConfigArgs *c)
2210 {
2211         slap_overinst           *on = (slap_overinst *)c->bi;
2212         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2213         int rc = 0;
2214
2215         if ( c->op == SLAP_CONFIG_EMIT ) {
2216                 switch ( c->type ) {
2217                 case SP_CHKPT:
2218                         if ( si->si_chkops || si->si_chktime ) {
2219                                 struct berval bv;
2220                                 bv.bv_len = sprintf( c->msg, "%d %d",
2221                                         si->si_chkops, si->si_chktime );
2222                                 bv.bv_val = c->msg;
2223                                 value_add_one( &c->rvalue_vals, &bv );
2224                         } else {
2225                                 rc = 1;
2226                         }
2227                         break;
2228                 case SP_SESSL:
2229                         if ( si->si_logs ) {
2230                                 c->value_int = si->si_logs->sl_size;
2231                         } else {
2232                                 rc = 1;
2233                         }
2234                         break;
2235                 case SP_NOPRES:
2236                         if ( si->si_nopres ) {
2237                                 c->value_int = 1;
2238                         } else {
2239                                 rc = 1;
2240                         }
2241                         break;
2242                 case SP_USEHINT:
2243                         if ( si->si_usehint ) {
2244                                 c->value_int = 1;
2245                         } else {
2246                                 rc = 1;
2247                         }
2248                         break;
2249                 }
2250                 return rc;
2251         } else if ( c->op == LDAP_MOD_DELETE ) {
2252                 switch ( c->type ) {
2253                 case SP_CHKPT:
2254                         si->si_chkops = 0;
2255                         si->si_chktime = 0;
2256                         break;
2257                 case SP_SESSL:
2258                         if ( si->si_logs )
2259                                 si->si_logs->sl_size = 0;
2260                         else
2261                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2262                         break;
2263                 case SP_NOPRES:
2264                         if ( si->si_nopres )
2265                                 si->si_nopres = 0;
2266                         else
2267                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2268                         break;
2269                 case SP_USEHINT:
2270                         if ( si->si_usehint )
2271                                 si->si_usehint = 0;
2272                         else
2273                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2274                         break;
2275                 }
2276                 return rc;
2277         }
2278         switch ( c->type ) {
2279         case SP_CHKPT:
2280                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2281                         snprintf( c->msg, sizeof( c->msg ), "%s unable to parse checkpoint ops # \"%s\"",
2282                                 c->argv[0], c->argv[1] );
2283                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2284                                 "%s: %s\n", c->log, c->msg, 0 );
2285                         return ARG_BAD_CONF;
2286                 }
2287                 if ( si->si_chkops <= 0 ) {
2288                         snprintf( c->msg, sizeof( c->msg ), "%s invalid checkpoint ops # \"%d\"",
2289                                 c->argv[0], si->si_chkops );
2290                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2291                                 "%s: %s\n", c->log, c->msg, 0 );
2292                         return ARG_BAD_CONF;
2293                 }
2294                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2295                         snprintf( c->msg, sizeof( c->msg ), "%s unable to parse checkpoint time \"%s\"",
2296                                 c->argv[0], c->argv[1] );
2297                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2298                                 "%s: %s\n", c->log, c->msg, 0 );
2299                         return ARG_BAD_CONF;
2300                 }
2301                 if ( si->si_chktime <= 0 ) {
2302                         snprintf( c->msg, sizeof( c->msg ), "%s invalid checkpoint time \"%d\"",
2303                                 c->argv[0], si->si_chkops );
2304                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2305                                 "%s: %s\n", c->log, c->msg, 0 );
2306                         return ARG_BAD_CONF;
2307                 }
2308                 si->si_chktime *= 60;
2309                 break;
2310         case SP_SESSL: {
2311                 sessionlog *sl;
2312                 int size = c->value_int;
2313
2314                 if ( size < 0 ) {
2315                         snprintf( c->msg, sizeof( c->msg ), "%s size %d is negative",
2316                                 c->argv[0], size );
2317                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2318                                 "%s: %s\n", c->log, c->msg, 0 );
2319                         return ARG_BAD_CONF;
2320                 }
2321                 sl = si->si_logs;
2322                 if ( !sl ) {
2323                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2324                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2325                         sl->sl_mincsn.bv_len = 0;
2326                         sl->sl_num = 0;
2327                         sl->sl_head = sl->sl_tail = NULL;
2328                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2329                         si->si_logs = sl;
2330                 }
2331                 sl->sl_size = size;
2332                 }
2333                 break;
2334         case SP_NOPRES:
2335                 si->si_nopres = c->value_int;
2336                 break;
2337         case SP_USEHINT:
2338                 si->si_usehint = c->value_int;
2339                 break;
2340         }
2341         return rc;
2342 }
2343
2344 /* ITS#3456 we cannot run this search on the main thread, must use a
2345  * child thread in order to insure we have a big enough stack.
2346  */
2347 static void *
2348 syncprov_db_otask(
2349         void *ptr
2350 )
2351 {
2352         syncprov_findcsn( ptr, FIND_MAXCSN );
2353         return NULL;
2354 }
2355
2356 /* Read any existing contextCSN from the underlying db.
2357  * Then search for any entries newer than that. If no value exists,
2358  * just generate it. Cache whatever result.
2359  */
2360 static int
2361 syncprov_db_open(
2362     BackendDB *be
2363 )
2364 {
2365         slap_overinst   *on = (slap_overinst *) be->bd_info;
2366         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2367
2368         Connection conn = { 0 };
2369         OperationBuffer opbuf = { 0 };
2370         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2371         Operation *op = (Operation *) &opbuf;
2372         Entry *e = NULL;
2373         Attribute *a;
2374         int rc;
2375         void *thrctx = NULL;
2376
2377         if ( !SLAP_LASTMOD( be )) {
2378                 Debug( LDAP_DEBUG_ANY,
2379                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2380                 return -1;
2381         }
2382
2383         if ( slapMode & SLAP_TOOL_MODE ) {
2384                 return 0;
2385         }
2386
2387         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2388         if ( rc ) {
2389                 return rc;
2390         }
2391
2392         thrctx = ldap_pvt_thread_pool_context();
2393         connection_fake_init( &conn, op, thrctx );
2394         op->o_bd = be;
2395         op->o_dn = be->be_rootdn;
2396         op->o_ndn = be->be_rootndn;
2397
2398         ctxcsnbuf[0] = '\0';
2399
2400         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2401                 slap_schema.si_ad_contextCSN, 0, &e, on );
2402
2403         if ( e ) {
2404                 ldap_pvt_thread_t tid;
2405
2406                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2407                 if ( a ) {
2408                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2409                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2410                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2411                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2412                                 si->si_ctxcsn.bv_len );
2413                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2414                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2415                 }
2416                 overlay_entry_release_ov( op, e, 0, on );
2417                 if ( !BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2418                         op->o_req_dn = be->be_suffix[0];
2419                         op->o_req_ndn = be->be_nsuffix[0];
2420                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2421                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2422                         ldap_pvt_thread_join( tid, NULL );
2423                 }
2424         }
2425
2426         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2427                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2428                 /* If we're also a consumer, and we didn't get a contextCSN,
2429                  * then don't generate anything, wait for our provider to send it
2430                  * to us.
2431                  */
2432                         goto out;
2433                 }
2434                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2435                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2436         }
2437
2438         /* If our ctxcsn is different from what was read from the root
2439          * entry, make sure we do a checkpoint on close
2440          */
2441         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2442                 si->si_numops++;
2443         }
2444
2445 out:
2446         op->o_bd->bd_info = (BackendInfo *)on;
2447         return 0;
2448 }
2449
2450 /* Write the current contextCSN into the underlying db.
2451  */
2452 static int
2453 syncprov_db_close(
2454     BackendDB *be
2455 )
2456 {
2457     slap_overinst   *on = (slap_overinst *) be->bd_info;
2458     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2459
2460         if ( slapMode & SLAP_TOOL_MODE ) {
2461                 return 0;
2462         }
2463         if ( si->si_numops ) {
2464                 Connection conn;
2465                 OperationBuffer opbuf;
2466                 Operation *op = (Operation *) &opbuf;
2467                 SlapReply rs = {REP_RESULT};
2468                 void *thrctx;
2469
2470                 thrctx = ldap_pvt_thread_pool_context();
2471                 connection_fake_init( &conn, op, thrctx );
2472                 op->o_bd = be;
2473                 op->o_dn = be->be_rootdn;
2474                 op->o_ndn = be->be_rootndn;
2475                 syncprov_checkpoint( op, &rs, on );
2476         }
2477
2478     return 0;
2479 }
2480
2481 static int
2482 syncprov_db_init(
2483         BackendDB *be
2484 )
2485 {
2486         slap_overinst   *on = (slap_overinst *)be->bd_info;
2487         syncprov_info_t *si;
2488
2489         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2490                 Debug( LDAP_DEBUG_ANY,
2491                         "syncprov must be instantiated within a database.\n",
2492                         0, 0, 0 );
2493                 return 1;
2494         }
2495
2496         si = ch_calloc(1, sizeof(syncprov_info_t));
2497         on->on_bi.bi_private = si;
2498         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2499         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2500         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2501         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2502
2503         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2504         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2505         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2506         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2507
2508         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2509         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2510
2511         return 0;
2512 }
2513
2514 static int
2515 syncprov_db_destroy(
2516         BackendDB *be
2517 )
2518 {
2519         slap_overinst   *on = (slap_overinst *)be->bd_info;
2520         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2521
2522         if ( si ) {
2523                 if ( si->si_logs ) {
2524                         slog_entry *se = si->si_logs->sl_head;
2525
2526                         while ( se ) {
2527                                 slog_entry *se_next = se->se_next;
2528                                 ch_free( se );
2529                                 se = se_next;
2530                         }
2531
2532                         ch_free( si->si_logs );
2533                 }
2534                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2535                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2536                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2537                 ch_free( si );
2538         }
2539
2540         return 0;
2541 }
2542
2543 static int syncprov_parseCtrl (
2544         Operation *op,
2545         SlapReply *rs,
2546         LDAPControl *ctrl )
2547 {
2548         ber_tag_t tag;
2549         BerElementBuffer berbuf;
2550         BerElement *ber = (BerElement *)&berbuf;
2551         ber_int_t mode;
2552         ber_len_t len;
2553         struct berval cookie = BER_BVNULL;
2554         sync_control *sr;
2555         int rhint = 0;
2556
2557         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2558                 rs->sr_text = "Sync control specified multiple times";
2559                 return LDAP_PROTOCOL_ERROR;
2560         }
2561
2562         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2563                 rs->sr_text = "Sync control specified with pagedResults control";
2564                 return LDAP_PROTOCOL_ERROR;
2565         }
2566
2567         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2568                 rs->sr_text = "Sync control value is empty (or absent)";
2569                 return LDAP_PROTOCOL_ERROR;
2570         }
2571
2572         /* Parse the control value
2573          *      syncRequestValue ::= SEQUENCE {
2574          *              mode   ENUMERATED {
2575          *                      -- 0 unused
2576          *                      refreshOnly             (1),
2577          *                      -- 2 reserved
2578          *                      refreshAndPersist       (3)
2579          *              },
2580          *              cookie  syncCookie OPTIONAL
2581          *      }
2582          */
2583
2584         ber_init2( ber, &ctrl->ldctl_value, 0 );
2585
2586         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2587                 rs->sr_text = "Sync control : mode decoding error";
2588                 return LDAP_PROTOCOL_ERROR;
2589         }
2590
2591         switch( mode ) {
2592         case LDAP_SYNC_REFRESH_ONLY:
2593                 mode = SLAP_SYNC_REFRESH;
2594                 break;
2595         case LDAP_SYNC_REFRESH_AND_PERSIST:
2596                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2597                 break;
2598         default:
2599                 rs->sr_text = "Sync control : unknown update mode";
2600                 return LDAP_PROTOCOL_ERROR;
2601         }
2602
2603         tag = ber_peek_tag( ber, &len );
2604
2605         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2606                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2607                         rs->sr_text = "Sync control : cookie decoding error";
2608                         return LDAP_PROTOCOL_ERROR;
2609                 }
2610                 tag = ber_peek_tag( ber, &len );
2611         }
2612         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2613                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2614                         rs->sr_text = "Sync control : rhint decoding error";
2615                         return LDAP_PROTOCOL_ERROR;
2616                 }
2617         }
2618         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2619                         rs->sr_text = "Sync control : decoding error";
2620                         return LDAP_PROTOCOL_ERROR;
2621         }
2622         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2623         sr->sr_rhint = rhint;
2624         if (!BER_BVISNULL(&cookie)) {
2625                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2626                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2627                         sr->sr_state.rid == -1 ) {
2628                         rs->sr_text = "Sync control : cookie parsing error";
2629                         return LDAP_PROTOCOL_ERROR;
2630                 }
2631         }
2632
2633         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2634
2635         op->o_sync = ctrl->ldctl_iscritical
2636                 ? SLAP_CONTROL_CRITICAL
2637                 : SLAP_CONTROL_NONCRITICAL;
2638
2639         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2640
2641         return LDAP_SUCCESS;
2642 }
2643
2644 /* This overlay is set up for dynamic loading via moduleload. For static
2645  * configuration, you'll need to arrange for the slap_overinst to be
2646  * initialized and registered by some other function inside slapd.
2647  */
2648
2649 static slap_overinst            syncprov;
2650
2651 int
2652 syncprov_initialize()
2653 {
2654         int rc;
2655
2656         rc = register_supported_control( LDAP_CONTROL_SYNC,
2657                 SLAP_CTRL_SEARCH, NULL,
2658                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2659         if ( rc != LDAP_SUCCESS ) {
2660                 Debug( LDAP_DEBUG_ANY,
2661                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2662                 return rc;
2663         }
2664
2665         syncprov.on_bi.bi_type = "syncprov";
2666         syncprov.on_bi.bi_db_init = syncprov_db_init;
2667         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2668         syncprov.on_bi.bi_db_open = syncprov_db_open;
2669         syncprov.on_bi.bi_db_close = syncprov_db_close;
2670
2671         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2672         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2673
2674         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2675         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2676         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2677         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2678         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2679         syncprov.on_bi.bi_op_search = syncprov_op_search;
2680         syncprov.on_bi.bi_extended = syncprov_op_extended;
2681         syncprov.on_bi.bi_operational = syncprov_operational;
2682
2683         syncprov.on_bi.bi_cf_ocs = spocs;
2684
2685         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2686
2687         rc = config_register_schema( spcfg, spocs );
2688         if ( rc ) return rc;
2689
2690         return overlay_register( &syncprov );
2691 }
2692
2693 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2694 int
2695 init_module( int argc, char *argv[] )
2696 {
2697         return syncprov_initialize();
2698 }
2699 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2700
2701 #endif /* defined(SLAPD_OVER_SYNCPROV) */