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