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 2004-2005 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
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73 #define RUNQ_INTERVAL   36000   /* a long time */
  74         ldap_pvt_thread_mutex_t s_mutex;
  75 } syncops;
  76
  77 /* A received sync control */
  78 typedef struct sync_control {
  79         struct sync_cookie sr_state;
  80         int sr_rhint;
  81 } sync_control;
  82
  83 #if 0 /* moved back to slap.h */
  84 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  85 #endif
  86 /* o_sync_mode uses data bits of o_sync */
  87 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  88
  89 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  93
  94 /* Record of which searches matched at premodify step */
  95 typedef struct syncmatches {
  96         struct syncmatches *sm_next;
  97         syncops *sm_op;
  98 } syncmatches;
  99
 100 /* Session log data */
 101 typedef struct slog_entry {
 102         struct slog_entry *se_next;
 103         struct berval se_uuid;
 104         struct berval se_csn;
 105         ber_tag_t       se_tag;
 106 } slog_entry;
 107
 108 typedef struct sessionlog {
 109         struct berval   sl_mincsn;
 110         int             sl_num;
 111         int             sl_size;
 112         slog_entry *sl_head;
 113         slog_entry *sl_tail;
 114         ldap_pvt_thread_mutex_t sl_mutex;
 115 } sessionlog;
 116
 117 /* The main state for this overlay */
 118 typedef struct syncprov_info_t {
 119         syncops         *si_ops;
 120         struct berval   si_ctxcsn;      /* ldapsync context */
 121         int             si_chkops;      /* checkpointing info */
 122         int             si_chktime;
 123         int             si_numops;      /* number of ops since last checkpoint */
 124         int             si_nopres;      /* Skip present phase */
 125         int             si_usehint;     /* use reload hint */
 126         time_t  si_chklast;     /* time of last checkpoint */
 127         Avlnode *si_mods;       /* entries being modified */
 128         sessionlog      *si_logs;
 129         ldap_pvt_thread_mutex_t si_csn_mutex;
 130         ldap_pvt_thread_mutex_t si_ops_mutex;
 131         ldap_pvt_thread_mutex_t si_mods_mutex;
 132         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 133 } syncprov_info_t;
 134
 135 typedef struct opcookie {
 136         slap_overinst *son;
 137         syncmatches *smatches;
 138         struct berval sdn;      /* DN of entry, for deletes */
 139         struct berval sndn;
 140         struct berval suuid;    /* UUID of entry */
 141         struct berval sctxcsn;
 142         int sreference; /* Is the entry a reference? */
 143 } opcookie;
 144
 145 typedef struct fbase_cookie {
 146         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 147         syncops *fss;   /* persistent search we're testing against */
 148         int fbase;      /* if TRUE we found the search base and it's still valid */
 149         int fscope;     /* if TRUE then fdn is within the psearch scope */
 150 } fbase_cookie;
 151
 152 static AttributeName csn_anlist[3];
 153 static AttributeName uuid_anlist[2];
 154
 155 /* Build a LDAPsync intermediate state control */
 156 static int
 157 syncprov_state_ctrl(
 158         Operation       *op,
 159         SlapReply       *rs,
 160         Entry           *e,
 161         int             entry_sync_state,
 162         LDAPControl     **ctrls,
 163         int             num_ctrls,
 164         int             send_cookie,
 165         struct berval   *cookie )
 166 {
 167         Attribute* a;
 168         int ret;
 169
 170         BerElementBuffer berbuf;
 171         BerElement *ber = (BerElement *)&berbuf;
 172
 173         struct berval   entryuuid_bv = BER_BVNULL;
 174
 175         ber_init2( ber, 0, LBER_USE_DER );
 176         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 177
 178         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 179
 180         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 181                 AttributeDescription *desc = a->a_desc;
 182                 if ( desc == slap_schema.si_ad_entryUUID ) {
 183                         entryuuid_bv = a->a_nvals[0];
 184                         break;
 185                 }
 186         }
 187
 188         /* FIXME: what if entryuuid is NULL or empty ? */
 189
 190         if ( send_cookie && cookie ) {
 191                 ber_printf( ber, "{eOON}",
 192                         entry_sync_state, &entryuuid_bv, cookie );
 193         } else {
 194                 ber_printf( ber, "{eON}",
 195                         entry_sync_state, &entryuuid_bv );
 196         }
 197
 198         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 199         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 200         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 201
 202         ber_free_buf( ber );
 203
 204         if ( ret < 0 ) {
 205                 Debug( LDAP_DEBUG_TRACE,
 206                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 207                         0, 0, 0 );
 208                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 209                 return ret;
 210         }
 211
 212         return LDAP_SUCCESS;
 213 }
 214
 215 /* Build a LDAPsync final state control */
 216 static int
 217 syncprov_done_ctrl(
 218         Operation       *op,
 219         SlapReply       *rs,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval *cookie,
 224         int                     refreshDeletes )
 225 {
 226         int ret;
 227         BerElementBuffer berbuf;
 228         BerElement *ber = (BerElement *)&berbuf;
 229
 230         ber_init2( ber, NULL, LBER_USE_DER );
 231         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 232
 233         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 234
 235         ber_printf( ber, "{" );
 236         if ( send_cookie && cookie ) {
 237                 ber_printf( ber, "O", cookie );
 238         }
 239         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 240                 ber_printf( ber, "b", refreshDeletes );
 241         }
 242         ber_printf( ber, "N}" );
 243
 244         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 245         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 246         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 247
 248         ber_free_buf( ber );
 249
 250         if ( ret < 0 ) {
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 253                         0, 0, 0 );
 254                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 255                 return ret;
 256         }
 257
 258         return LDAP_SUCCESS;
 259 }
 260
 261 static int
 262 syncprov_sendinfo(
 263         Operation       *op,
 264         SlapReply       *rs,
 265         int                     type,
 266         struct berval *cookie,
 267         int                     refreshDone,
 268         BerVarray       syncUUIDs,
 269         int                     refreshDeletes )
 270 {
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273         struct berval rspdata;
 274
 275         int ret;
 276
 277         ber_init2( ber, NULL, LBER_USE_DER );
 278         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 279
 280         if ( type ) {
 281                 switch ( type ) {
 282                 case LDAP_TAG_SYNC_NEW_COOKIE:
 283                         ber_printf( ber, "tO", type, cookie );
 284                         break;
 285                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 286                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 287                         ber_printf( ber, "t{", type );
 288                         if ( cookie ) {
 289                                 ber_printf( ber, "O", cookie );
 290                         }
 291                         if ( refreshDone == 0 ) {
 292                                 ber_printf( ber, "b", refreshDone );
 293                         }
 294                         ber_printf( ber, "N}" );
 295                         break;
 296                 case LDAP_TAG_SYNC_ID_SET:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDeletes == 1 ) {
 302                                 ber_printf( ber, "b", refreshDeletes );
 303                         }
 304                         ber_printf( ber, "[W]", syncUUIDs );
 305                         ber_printf( ber, "N}" );
 306                         break;
 307                 default:
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 310                                 type, 0, 0 );
 311                         return LDAP_OTHER;
 312                 }
 313         }
 314
 315         ret = ber_flatten2( ber, &rspdata, 0 );
 316
 317         if ( ret < 0 ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "syncprov_sendinfo: ber_flatten2 failed\n",
 320                         0, 0, 0 );
 321                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 322                 return ret;
 323         }
 324
 325         rs->sr_rspoid = LDAP_SYNC_INFO;
 326         rs->sr_rspdata = &rspdata;
 327         send_ldap_intermediate( op, rs );
 328         rs->sr_rspdata = NULL;
 329         ber_free_buf( ber );
 330
 331         return LDAP_SUCCESS;
 332 }
 333
 334 /* Find a modtarget in an AVL tree */
 335 static int
 336 sp_avl_cmp( const void *c1, const void *c2 )
 337 {
 338         const modtarget *m1, *m2;
 339         int rc;
 340
 341         m1 = c1; m2 = c2;
 342         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 343
 344         if ( rc ) return rc;
 345         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 346 }
 347
 348 /* syncprov_findbase:
 349  *   finds the true DN of the base of a search (with alias dereferencing) and
 350  * checks to make sure the base entry doesn't get replaced with a different
 351  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 352  * change is detected, any persistent search on this base must be terminated /
 353  * reloaded.
 354  *   On the first call, we just save the DN and entryID. On subsequent calls
 355  * we compare the DN and entryID with the saved values.
 356  */
 357 static int
 358 findbase_cb( Operation *op, SlapReply *rs )
 359 {
 360         slap_callback *sc = op->o_callback;
 361
 362         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 363                 fbase_cookie *fc = sc->sc_private;
 364
 365                 /* If no entryID, we're looking for the first time.
 366                  * Just store whatever we got.
 367                  */
 368                 if ( fc->fss->s_eid == NOID ) {
 369                         fc->fbase = 2;
 370                         fc->fss->s_eid = rs->sr_entry->e_id;
 371                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 372
 373                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 374                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 375
 376                 /* OK, the DN is the same and the entryID is the same. */
 377                         fc->fbase = 1;
 378                 }
 379         }
 380         if ( rs->sr_err != LDAP_SUCCESS ) {
 381                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 382         }
 383         return LDAP_SUCCESS;
 384 }
 385
 386 static int
 387 syncprov_findbase( Operation *op, fbase_cookie *fc )
 388 {
 389         opcookie *opc = op->o_callback->sc_private;
 390         slap_overinst *on = opc->son;
 391
 392         /* Use basic parameters from syncrepl search, but use
 393          * current op's threadctx / tmpmemctx
 394          */
 395         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 396         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 397                 slap_callback cb = {0};
 398                 Operation fop;
 399                 SlapReply frs = { REP_RESULT };
 400                 int rc;
 401
 402                 fc->fss->s_flags ^= PS_FIND_BASE;
 403                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 404
 405                 fop = *fc->fss->s_op;
 406
 407                 fop.o_hdr = op->o_hdr;
 408                 fop.o_bd = op->o_bd;
 409                 fop.o_time = op->o_time;
 410                 fop.o_tincr = op->o_tincr;
 411
 412                 cb.sc_response = findbase_cb;
 413                 cb.sc_private = fc;
 414
 415                 fop.o_sync_mode = 0;    /* turn off sync mode */
 416                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 417                 fop.o_callback = &cb;
 418                 fop.o_tag = LDAP_REQ_SEARCH;
 419                 fop.ors_scope = LDAP_SCOPE_BASE;
 420                 fop.ors_limit = NULL;
 421                 fop.ors_slimit = 1;
 422                 fop.ors_tlimit = SLAP_NO_LIMIT;
 423                 fop.ors_attrs = slap_anlist_no_attrs;
 424                 fop.ors_attrsonly = 1;
 425
 426                 fop.o_bd->bd_info = on->on_info->oi_orig;
 427                 rc = fop.o_bd->be_search( &fop, &frs );
 428                 fop.o_bd->bd_info = (BackendInfo *)on;
 429         } else {
 430                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 431                 fc->fbase = 1;
 432         }
 433
 434         /* After the first call, see if the fdn resides in the scope */
 435         if ( fc->fbase == 1 ) {
 436                 switch ( fc->fss->s_op->ors_scope ) {
 437                 case LDAP_SCOPE_BASE:
 438                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 439                         break;
 440                 case LDAP_SCOPE_ONELEVEL: {
 441                         struct berval pdn;
 442                         dnParent( fc->fdn, &pdn );
 443                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 444                         break; }
 445                 case LDAP_SCOPE_SUBTREE:
 446                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 447                         break;
 448 #ifdef LDAP_SCOPE_SUBORDINATE
 449                 case LDAP_SCOPE_SUBORDINATE:
 450                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 451                                 !dn_match( fc->fdn, &fc->fss->s_base );
 452                         break;
 453 #endif
 454                 }
 455         }
 456
 457         if ( fc->fbase )
 458                 return LDAP_SUCCESS;
 459
 460         /* If entryID has changed, then the base of this search has
 461          * changed. Invalidate the psearch.
 462          */
 463         return LDAP_NO_SUCH_OBJECT;
 464 }
 465
 466 /* syncprov_findcsn:
 467  *   This function has three different purposes, but they all use a search
 468  * that filters on entryCSN so they're combined here.
 469  * 1: at startup time, after a contextCSN has been read from the database,
 470  * we search for all entries with CSN >= contextCSN in case the contextCSN
 471  * was not checkpointed at the previous shutdown.
 472  *
 473  * 2: when the current contextCSN is known and we have a sync cookie, we search
 474  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 475  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 476  *
 477  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 478  * CSN, and generate Present records for them. We always collect this result
 479  * in SyncID sets, even if there's only one match.
 480  */
 481 #define FIND_MAXCSN     1
 482 #define FIND_CSN        2
 483 #define FIND_PRESENT    3
 484
 485 static int
 486 findmax_cb( Operation *op, SlapReply *rs )
 487 {
 488         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 489                 struct berval *maxcsn = op->o_callback->sc_private;
 490                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 491                         slap_schema.si_ad_entryCSN );
 492
 493                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 494                         maxcsn->bv_len = a->a_vals[0].bv_len;
 495                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 496                 }
 497         }
 498         return LDAP_SUCCESS;
 499 }
 500
 501 static int
 502 findcsn_cb( Operation *op, SlapReply *rs )
 503 {
 504         slap_callback *sc = op->o_callback;
 505
 506         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 507                 sc->sc_private = (void *)1;
 508         }
 509         return LDAP_SUCCESS;
 510 }
 511
 512 /* Build a list of entryUUIDs for sending in a SyncID set */
 513
 514 #define UUID_LEN        16
 515
 516 typedef struct fpres_cookie {
 517         int num;
 518         BerVarray uuids;
 519         char *last;
 520 } fpres_cookie;
 521
 522 static int
 523 findpres_cb( Operation *op, SlapReply *rs )
 524 {
 525         slap_callback *sc = op->o_callback;
 526         fpres_cookie *pc = sc->sc_private;
 527         Attribute *a;
 528         int ret = SLAP_CB_CONTINUE;
 529
 530         switch ( rs->sr_type ) {
 531         case REP_SEARCH:
 532                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 533                 if ( a ) {
 534                         pc->uuids[pc->num].bv_val = pc->last;
 535                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 536                                 pc->uuids[pc->num].bv_len );
 537                         pc->num++;
 538                         pc->last = pc->uuids[pc->num].bv_val;
 539                         pc->uuids[pc->num].bv_val = NULL;
 540                 }
 541                 ret = LDAP_SUCCESS;
 542                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 543                         break;
 544                 /* FALLTHRU */
 545         case REP_RESULT:
 546                 ret = rs->sr_err;
 547                 if ( pc->num ) {
 548                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 549                                 0, pc->uuids, 0 );
 550                         pc->uuids[pc->num].bv_val = pc->last;
 551                         pc->num = 0;
 552                         pc->last = pc->uuids[0].bv_val;
 553                 }
 554                 break;
 555         default:
 556                 break;
 557         }
 558         return ret;
 559 }
 560
 561 static int
 562 syncprov_findcsn( Operation *op, int mode )
 563 {
 564         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 565         syncprov_info_t         *si = on->on_bi.bi_private;
 566
 567         slap_callback cb = {0};
 568         Operation fop;
 569         SlapReply frs = { REP_RESULT };
 570         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 571         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 572         struct berval maxcsn;
 573         Filter cf, af;
 574 #ifdef LDAP_COMP_MATCH
 575         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 576 #else
 577         AttributeAssertion eq = { NULL, BER_BVNULL };
 578 #endif
 579         int i, rc = LDAP_SUCCESS;
 580         fpres_cookie pcookie;
 581         sync_control *srs = NULL;
 582         int findcsn_retry = 1;
 583
 584         if ( mode != FIND_MAXCSN ) {
 585                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 586
 587                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 588                         return LDAP_OTHER;
 589                 }
 590         }
 591
 592         fop = *op;
 593         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 594         /* We want pure entries, not referrals */
 595         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 596
 597         cf.f_ava = &eq;
 598         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 599         cf.f_next = NULL;
 600
 601         fop.o_callback = &cb;
 602         fop.ors_limit = NULL;
 603         fop.ors_tlimit = SLAP_NO_LIMIT;
 604         fop.ors_filter = &cf;
 605         fop.ors_filterstr.bv_val = buf;
 606
 607 again:
 608         switch( mode ) {
 609         case FIND_MAXCSN:
 610                 cf.f_choice = LDAP_FILTER_GE;
 611                 cf.f_av_value = si->si_ctxcsn;
 612                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 613                         cf.f_av_value.bv_val );
 614                 fop.ors_attrsonly = 0;
 615                 fop.ors_attrs = csn_anlist;
 616                 fop.ors_slimit = SLAP_NO_LIMIT;
 617                 cb.sc_private = &maxcsn;
 618                 cb.sc_response = findmax_cb;
 619                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 620                 maxcsn.bv_val = cbuf;
 621                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 622                 break;
 623         case FIND_CSN:
 624                 cf.f_av_value = srs->sr_state.ctxcsn;
 625                 /* Look for exact match the first time */
 626                 if ( findcsn_retry ) {
 627                         cf.f_choice = LDAP_FILTER_EQUALITY;
 628                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 629                                 cf.f_av_value.bv_val );
 630                 /* On retry, look for <= */
 631                 } else {
 632                         cf.f_choice = LDAP_FILTER_LE;
 633                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 634                                 cf.f_av_value.bv_val );
 635                 }
 636                 fop.ors_attrsonly = 1;
 637                 fop.ors_attrs = slap_anlist_no_attrs;
 638                 fop.ors_slimit = 1;
 639                 cb.sc_private = NULL;
 640                 cb.sc_response = findcsn_cb;
 641                 break;
 642         case FIND_PRESENT:
 643                 af.f_choice = LDAP_FILTER_AND;
 644                 af.f_next = NULL;
 645                 af.f_and = &cf;
 646                 cf.f_choice = LDAP_FILTER_LE;
 647                 cf.f_av_value = srs->sr_state.ctxcsn;
 648                 cf.f_next = op->ors_filter;
 649                 fop.ors_filter = &af;
 650                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 651                 fop.ors_attrsonly = 0;
 652                 fop.ors_attrs = uuid_anlist;
 653                 fop.ors_slimit = SLAP_NO_LIMIT;
 654                 cb.sc_private = &pcookie;
 655                 cb.sc_response = findpres_cb;
 656                 pcookie.num = 0;
 657
 658                 /* preallocate storage for a full set */
 659                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 660                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 661                         op->o_tmpmemctx );
 662                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 663                 pcookie.uuids[0].bv_val = pcookie.last;
 664                 pcookie.uuids[0].bv_len = UUID_LEN;
 665                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 666                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 667                         pcookie.uuids[i].bv_len = UUID_LEN;
 668                 }
 669                 break;
 670         }
 671
 672         fop.o_bd->bd_info = on->on_info->oi_orig;
 673         fop.o_bd->be_search( &fop, &frs );
 674         fop.o_bd->bd_info = (BackendInfo *)on;
 675
 676         switch( mode ) {
 677         case FIND_MAXCSN:
 678                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 679                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 680                 break;
 681         case FIND_CSN:
 682                 /* If matching CSN was not found, invalidate the context. */
 683                 if ( !cb.sc_private ) {
 684                         /* If we didn't find an exact match, then try for <= */
 685                         if ( findcsn_retry ) {
 686                                 findcsn_retry = 0;
 687                                 goto again;
 688                         }
 689                         rc = LDAP_NO_SUCH_OBJECT;
 690                 }
 691                 break;
 692         case FIND_PRESENT:
 693                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 694                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 695                 break;
 696         }
 697
 698         return rc;
 699 }
 700
 701 static void
 702 syncprov_free_syncop( syncops *so )
 703 {
 704         syncres *sr, *srnext;
 705         GroupAssertion *ga, *gnext;
 706
 707         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 708         if ( --so->s_inuse > 0 ) {
 709                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 710                 return;
 711         }
 712         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 713         if ( so->s_flags & PS_IS_DETACHED ) {
 714                 filter_free( so->s_op->ors_filter );
 715                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 716                         gnext = ga->ga_next;
 717                         ch_free( ga );
 718                 }
 719                 ch_free( so->s_op );
 720         }
 721         ch_free( so->s_base.bv_val );
 722         for ( sr=so->s_res; sr; sr=srnext ) {
 723                 srnext = sr->s_next;
 724                 ch_free( sr );
 725         }
 726         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 727         ch_free( so );
 728 }
 729
 730 /* Send a persistent search response */
 731 static int
 732 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode)
 733 {
 734         slap_overinst *on = opc->son;
 735
 736         SlapReply rs = { REP_SEARCH };
 737         LDAPControl *ctrls[2];
 738         struct berval cookie;
 739         Entry e_uuid = {0};
 740         Attribute a_uuid = {0};
 741
 742         if ( so->s_op->o_abandon )
 743                 return SLAPD_ABANDON;
 744
 745         ctrls[1] = NULL;
 746         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 747
 748         e_uuid.e_attrs = &a_uuid;
 749         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 750         a_uuid.a_nvals = &opc->suuid;
 751         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 752                 mode, ctrls, 0, 1, &cookie );
 753         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 754
 755         rs.sr_ctrls = ctrls;
 756         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 757         switch( mode ) {
 758         case LDAP_SYNC_ADD:
 759                 rs.sr_entry = *e;
 760                 if ( rs.sr_entry->e_private )
 761                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 762                 if ( opc->sreference ) {
 763                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 764                         send_search_reference( op, &rs );
 765                         ber_bvarray_free( rs.sr_ref );
 766                         if ( !rs.sr_entry )
 767                                 *e = NULL;
 768                         break;
 769                 }
 770                 /* fallthru */
 771         case LDAP_SYNC_MODIFY:
 772                 rs.sr_entry = *e;
 773                 if ( rs.sr_entry->e_private )
 774                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 775                 rs.sr_attrs = op->ors_attrs;
 776                 send_search_entry( op, &rs );
 777                 if ( !rs.sr_entry )
 778                         *e = NULL;
 779                 break;
 780         case LDAP_SYNC_DELETE:
 781                 e_uuid.e_attrs = NULL;
 782                 e_uuid.e_name = opc->sdn;
 783                 e_uuid.e_nname = opc->sndn;
 784                 rs.sr_entry = &e_uuid;
 785                 if ( opc->sreference ) {
 786                         struct berval bv = BER_BVNULL;
 787                         rs.sr_ref = &bv;
 788                         send_search_reference( op, &rs );
 789                 } else {
 790                         send_search_entry( op, &rs );
 791                 }
 792                 break;
 793         default:
 794                 assert(0);
 795         }
 796         /* In case someone else freed it already? */
 797         if ( rs.sr_ctrls ) {
 798                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 799                 rs.sr_ctrls = NULL;
 800         }
 801
 802         return rs.sr_err;
 803 }
 804
 805 /* Play back queued responses */
 806 static int
 807 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 808 {
 809         syncres *sr;
 810         Entry *e;
 811         opcookie opc;
 812         int rc;
 813
 814         opc.son = on;
 815         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 816
 817         for (;;) {
 818                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 819                 sr = so->s_res;
 820                 if ( sr )
 821                         so->s_res = sr->s_next;
 822                 if ( !so->s_res )
 823                         so->s_restail = NULL;
 824                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 825
 826                 if ( !sr || so->s_op->o_abandon )
 827                         break;
 828
 829                 opc.sdn = sr->s_dn;
 830                 opc.sndn = sr->s_ndn;
 831                 opc.suuid = sr->s_uuid;
 832                 opc.sctxcsn = sr->s_csn;
 833                 opc.sreference = sr->s_isreference;
 834                 e = NULL;
 835
 836                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 837                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 838                         if ( rc ) {
 839                                 ch_free( sr );
 840                                 continue;
 841                         }
 842                 }
 843                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 844
 845                 if ( e ) {
 846                         be_entry_release_rw( op, e, 0 );
 847                 }
 848
 849                 ch_free( sr );
 850
 851                 if ( rc )
 852                         break;
 853         }
 854         op->o_bd->bd_info = (BackendInfo *)on;
 855         return rc;
 856 }
 857
 858 /* runqueue task for playing back queued responses */
 859 static void *
 860 syncprov_qtask( void *ctx, void *arg )
 861 {
 862         struct re_s *rtask = arg;
 863         syncops *so = rtask->arg;
 864         slap_overinst *on = so->s_op->o_private;
 865         OperationBuffer opbuf;
 866         Operation *op;
 867         BackendDB be;
 868
 869         op = (Operation *) &opbuf;
 870         *op = *so->s_op;
 871         op->o_hdr = (Opheader *)(op+1);
 872         op->o_controls = (void **)(op->o_hdr+1);
 873         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 874
 875         *op->o_hdr = *so->s_op->o_hdr;
 876
 877         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 878         op->o_tmpmfuncs = &slap_sl_mfuncs;
 879         op->o_threadctx = ctx;
 880
 881         /* syncprov_qplay expects a fake db */
 882         be = *so->s_op->o_bd;
 883         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 884         op->o_bd = &be;
 885         op->o_private = NULL;
 886         op->o_callback = NULL;
 887
 888         syncprov_qplay( op, on, so );
 889
 890         /* decrement use count... */
 891         syncprov_free_syncop( so );
 892
 893         /* wait until we get explicitly scheduled again */
 894         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 895         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 896         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 897         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 898
 899         return NULL;
 900 }
 901
 902 /* Queue a persistent search response */
 903 static int
 904 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 905 {
 906         syncres *sr;
 907
 908         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 909                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 910         sr->s_next = NULL;
 911         sr->s_dn.bv_val = (char *)(sr + 1);
 912         sr->s_dn.bv_len = opc->sdn.bv_len;
 913         sr->s_mode = mode;
 914         sr->s_isreference = opc->sreference;
 915         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 916                  opc->sdn.bv_val ) + 1;
 917         sr->s_ndn.bv_len = opc->sndn.bv_len;
 918         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 919                  opc->sndn.bv_val ) + 1;
 920         sr->s_uuid.bv_len = opc->suuid.bv_len;
 921         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 922         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 923         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 924         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 925
 926         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 927         if ( !so->s_res ) {
 928                 so->s_res = sr;
 929         } else {
 930                 so->s_restail->s_next = sr;
 931         }
 932         so->s_restail = sr;
 933
 934         /* If the base of the psearch was modified, check it next time round */
 935         if ( so->s_flags & PS_WROTE_BASE ) {
 936                 so->s_flags ^= PS_WROTE_BASE;
 937                 so->s_flags |= PS_FIND_BASE;
 938         }
 939         if ( so->s_flags & PS_IS_DETACHED ) {
 940                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 941                 if ( !so->s_qtask ) {
 942                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 943                                 syncprov_qtask, so, "syncprov_qtask",
 944                                 so->s_op->o_conn->c_peer_name.bv_val );
 945                         ++so->s_inuse;
 946                 } else {
 947                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 948                                 !so->s_qtask->next_sched.tv_sec ) {
 949                                 so->s_qtask->interval.tv_sec = 0;
 950                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 951                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 952                                 ++so->s_inuse;
 953                         }
 954                 }
 955                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 956         }
 957         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 958         return LDAP_SUCCESS;
 959 }
 960
 961 static int
 962 syncprov_drop_psearch( syncops *so, int lock )
 963 {
 964         if ( so->s_flags & PS_IS_DETACHED ) {
 965                 if ( lock )
 966                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 967                 so->s_op->o_conn->c_n_ops_executing--;
 968                 so->s_op->o_conn->c_n_ops_completed++;
 969                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 970                         o_next );
 971                 if ( lock )
 972                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 973         }
 974         syncprov_free_syncop( so );
 975
 976         return 0;
 977 }
 978
 979 static int
 980 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 981 {
 982         slap_callback *sc = op->o_callback;
 983         op->o_callback = sc->sc_next;
 984         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 985         op->o_tmpfree( sc, op->o_tmpmemctx );
 986         return 0;
 987 }
 988
 989 static int
 990 syncprov_op_abandon( Operation *op, SlapReply *rs )
 991 {
 992         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 993         syncprov_info_t         *si = on->on_bi.bi_private;
 994         syncops *so, *soprev;
 995
 996         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 997         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 998                 soprev=so, so=so->s_next ) {
 999                 if ( so->s_op->o_connid == op->o_connid &&
1000                         so->s_op->o_msgid == op->orn_msgid ) {
1001                                 so->s_op->o_abandon = 1;
1002                                 soprev->s_next = so->s_next;
1003                                 break;
1004                 }
1005         }
1006         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1007         if ( so ) {
1008                 /* Is this really a Cancel exop? */
1009                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1010                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1011                         rs->sr_err = LDAP_CANCELLED;
1012                         send_ldap_result( so->s_op, rs );
1013                         if ( so->s_flags & PS_IS_DETACHED ) {
1014                                 slap_callback *cb;
1015                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1016                                 cb->sc_cleanup = syncprov_ab_cleanup;
1017                                 cb->sc_next = op->o_callback;
1018                                 cb->sc_private = so;
1019                                 return SLAP_CB_CONTINUE;
1020                         }
1021                 }
1022                 syncprov_drop_psearch( so, 0 );
1023         }
1024         return SLAP_CB_CONTINUE;
1025 }
1026
1027 /* Find which persistent searches are affected by this operation */
1028 static void
1029 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1030 {
1031         slap_overinst *on = opc->son;
1032         syncprov_info_t         *si = on->on_bi.bi_private;
1033
1034         fbase_cookie fc;
1035         syncops *ss, *sprev, *snext;
1036         Entry *e;
1037         Attribute *a;
1038         int rc;
1039         struct berval newdn;
1040         int freefdn = 0;
1041
1042         fc.fdn = &op->o_req_ndn;
1043         /* compute new DN */
1044         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1045                 struct berval pdn;
1046                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1047                 else dnParent( fc.fdn, &pdn );
1048                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1049                 fc.fdn = &newdn;
1050                 freefdn = 1;
1051         }
1052         if ( op->o_tag != LDAP_REQ_ADD ) {
1053                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1054                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1055                 /* If we're sending responses now, make a copy and unlock the DB */
1056                 if ( e && !saveit ) {
1057                         Entry *e2 = entry_dup( e );
1058                         be_entry_release_rw( op, e, 0 );
1059                         e = e2;
1060                 }
1061                 op->o_bd->bd_info = (BackendInfo *)on;
1062                 if ( rc ) return;
1063         } else {
1064                 e = op->ora_e;
1065         }
1066
1067         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1068                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1069                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1070                 opc->sreference = is_entry_referral( e );
1071                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1072                 if ( a )
1073                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1074         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1075                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1076                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1077                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1078                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1079         }
1080
1081         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1082         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1083                 sprev = ss, ss=snext)
1084         {
1085                 syncmatches *sm;
1086                 int found = 0;
1087
1088                 snext = ss->s_next;
1089                 /* validate base */
1090                 fc.fss = ss;
1091                 fc.fbase = 0;
1092                 fc.fscope = 0;
1093
1094                 /* If the base of the search is missing, signal a refresh */
1095                 rc = syncprov_findbase( op, &fc );
1096                 if ( rc != LDAP_SUCCESS ) {
1097                         SlapReply rs = {REP_RESULT};
1098                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1099                                 "search base has changed" );
1100                         sprev->s_next = snext;
1101                         syncprov_drop_psearch( ss, 1 );
1102                         ss = sprev;
1103                         continue;
1104                 }
1105
1106
1107                 /* If we're sending results now, look for this op in old matches */
1108                 if ( !saveit ) {
1109                         syncmatches *old;
1110
1111                         /* Did we modify the search base? */
1112                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1113                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1114                                 ss->s_flags |= PS_WROTE_BASE;
1115                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1116                         }
1117
1118                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1119                                 old=sm, sm=sm->sm_next ) {
1120                                 if ( sm->sm_op == ss ) {
1121                                         found = 1;
1122                                         old->sm_next = sm->sm_next;
1123                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1124                                         break;
1125                                 }
1126                         }
1127                 }
1128
1129                 /* check if current o_req_dn is in scope and matches filter */
1130                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1131                         LDAP_COMPARE_TRUE ) {
1132                         if ( saveit ) {
1133                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1134                                 sm->sm_next = opc->smatches;
1135                                 sm->sm_op = ss;
1136                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1137                                 ++ss->s_inuse;
1138                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1139                                 opc->smatches = sm;
1140                         } else {
1141                                 /* if found send UPDATE else send ADD */
1142                                 syncprov_qresp( opc, ss,
1143                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1144                         }
1145                 } else if ( !saveit && found ) {
1146                         /* send DELETE */
1147                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1148                 }
1149         }
1150         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1151
1152         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1153                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1154                 be_entry_release_rw( op, e, 0 );
1155                 op->o_bd->bd_info = (BackendInfo *)on;
1156         }
1157         if ( freefdn ) {
1158                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1159         }
1160 }
1161
1162 static int
1163 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1164 {
1165         slap_callback *cb = op->o_callback;
1166         opcookie *opc = cb->sc_private;
1167         slap_overinst *on = opc->son;
1168         syncprov_info_t         *si = on->on_bi.bi_private;
1169         syncmatches *sm, *snext;
1170         modtarget *mt, mtdummy;
1171
1172         for (sm = opc->smatches; sm; sm=snext) {
1173                 snext = sm->sm_next;
1174                 syncprov_free_syncop( sm->sm_op );
1175                 op->o_tmpfree( sm, op->o_tmpmemctx );
1176         }
1177
1178         /* Remove op from lock table */
1179         mtdummy.mt_op = op;
1180         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1181         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1182         if ( mt ) {
1183                 modinst *mi = mt->mt_mods;
1184
1185                 /* If there are more, promote the next one */
1186                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1187                 if ( mi->mi_next ) {
1188                         mt->mt_mods = mi->mi_next;
1189                         mt->mt_op = mt->mt_mods->mi_op;
1190                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1191                 } else {
1192                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1193                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1194                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1195                         ch_free( mt );
1196                 }
1197         }
1198         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1199         if ( !BER_BVISNULL( &opc->suuid ))
1200                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1201         if ( !BER_BVISNULL( &opc->sndn ))
1202                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1203         if ( !BER_BVISNULL( &opc->sdn ))
1204                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1205         op->o_callback = cb->sc_next;
1206         op->o_tmpfree(cb, op->o_tmpmemctx);
1207
1208         return 0;
1209 }
1210
1211 static void
1212 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1213 {
1214         syncprov_info_t         *si = on->on_bi.bi_private;
1215         Modifications mod;
1216         Operation opm;
1217         struct berval bv[2];
1218         slap_callback cb = {0};
1219         int manage = get_manageDSAit(op);
1220
1221         mod.sml_values = bv;
1222         bv[1].bv_val = NULL;
1223         bv[0] = si->si_ctxcsn;
1224         mod.sml_nvalues = NULL;
1225         mod.sml_desc = slap_schema.si_ad_contextCSN;
1226         mod.sml_op = LDAP_MOD_REPLACE;
1227         mod.sml_flags = 0;
1228         mod.sml_next = NULL;
1229
1230         cb.sc_response = slap_null_cb;
1231         opm = *op;
1232         opm.o_tag = LDAP_REQ_MODIFY;
1233         opm.o_callback = &cb;
1234         opm.orm_modlist = &mod;
1235         opm.o_req_dn = op->o_bd->be_suffix[0];
1236         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1237         opm.o_bd->bd_info = on->on_info->oi_orig;
1238         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1239         opm.o_bd->be_modify( &opm, rs );
1240         opm.o_managedsait = manage;
1241 }
1242
1243 static void
1244 syncprov_add_slog( Operation *op, struct berval *csn )
1245 {
1246         opcookie *opc = op->o_callback->sc_private;
1247         slap_overinst *on = opc->son;
1248         syncprov_info_t         *si = on->on_bi.bi_private;
1249         sessionlog *sl;
1250         slog_entry *se;
1251
1252         sl = si->si_logs;
1253         {
1254                 /* Allocate a record. UUIDs are not NUL-terminated. */
1255                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1256                         csn->bv_len + 1 );
1257                 se->se_next = NULL;
1258                 se->se_tag = op->o_tag;
1259
1260                 se->se_uuid.bv_val = (char *)(se+1);
1261                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1262                 se->se_uuid.bv_len = opc->suuid.bv_len;
1263
1264                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1265                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1266                 se->se_csn.bv_val[csn->bv_len] = '\0';
1267                 se->se_csn.bv_len = csn->bv_len;
1268
1269                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1270                 if ( sl->sl_head ) {
1271                         sl->sl_tail->se_next = se;
1272                 } else {
1273                         sl->sl_head = se;
1274                 }
1275                 sl->sl_tail = se;
1276                 sl->sl_num++;
1277                 while ( sl->sl_num > sl->sl_size ) {
1278                         se = sl->sl_head;
1279                         sl->sl_head = se->se_next;
1280                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1281                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1282                         ch_free( se );
1283                         sl->sl_num--;
1284                         if ( !sl->sl_head ) {
1285                                 sl->sl_tail = NULL;
1286                         }
1287                 }
1288                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1289         }
1290 }
1291
1292 /* Just set a flag if we found the matching entry */
1293 static int
1294 playlog_cb( Operation *op, SlapReply *rs )
1295 {
1296         if ( rs->sr_type == REP_SEARCH ) {
1297                 op->o_callback->sc_private = (void *)1;
1298         }
1299         return rs->sr_err;
1300 }
1301
1302 /* enter with sl->sl_mutex locked, release before returning */
1303 static void
1304 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1305         struct berval *oldcsn, struct berval *ctxcsn )
1306 {
1307         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1308         slog_entry *se;
1309         int i, j, ndel, num, nmods, mmods;
1310         BerVarray uuids;
1311
1312         if ( !sl->sl_num ) {
1313                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1314                 return;
1315         }
1316
1317         num = sl->sl_num;
1318         i = 0;
1319         nmods = 0;
1320
1321         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1322                 num * UUID_LEN, op->o_tmpmemctx );
1323
1324         uuids[0].bv_val = (char *)(uuids + num + 1);
1325
1326         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1327          * and everything else at the end. Do this first so we can
1328          * unlock the list mutex.
1329          */
1330         for ( se=sl->sl_head; se; se=se->se_next ) {
1331                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1332                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1333                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1334                         j = i;
1335                         i++;
1336                 } else {
1337                         nmods++;
1338                         j = num - nmods;
1339                 }
1340                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1341                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1342                 uuids[j].bv_len = UUID_LEN;
1343         }
1344         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1345
1346         ndel = i;
1347
1348         /* Zero out unused slots */
1349         for ( i=ndel; i < num - nmods; i++ )
1350                 uuids[i].bv_len = 0;
1351
1352         /* Mods must be validated to see if they belong in this delete set.
1353          */
1354
1355         mmods = nmods;
1356         /* Strip any duplicates */
1357         for ( i=0; i<nmods; i++ ) {
1358                 for ( j=0; j<ndel; j++ ) {
1359                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1360                                 uuids[num - 1 - i].bv_len = 0;
1361                                 mmods --;
1362                                 break;
1363                         }
1364                 }
1365                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1366                 for ( j=0; j<i; j++ ) {
1367                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1368                                 uuids[num - 1 - i].bv_len = 0;
1369                                 mmods --;
1370                                 break;
1371                         }
1372                 }
1373         }
1374
1375         if ( mmods ) {
1376                 Operation fop;
1377                 SlapReply frs = { REP_RESULT };
1378                 int rc;
1379                 Filter mf, af;
1380 #ifdef LDAP_COMP_MATCH
1381                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1382 #else
1383                 AttributeAssertion eq;
1384 #endif
1385                 slap_callback cb = {0};
1386
1387                 fop = *op;
1388
1389                 fop.o_sync_mode = 0;
1390                 fop.o_callback = &cb;
1391                 fop.ors_limit = NULL;
1392                 fop.ors_tlimit = SLAP_NO_LIMIT;
1393                 fop.ors_attrs = slap_anlist_all_attributes;
1394                 fop.ors_attrsonly = 0;
1395                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1396
1397                 af.f_choice = LDAP_FILTER_AND;
1398                 af.f_next = NULL;
1399                 af.f_and = &mf;
1400                 mf.f_choice = LDAP_FILTER_EQUALITY;
1401                 mf.f_ava = &eq;
1402                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1403                 mf.f_next = fop.ors_filter;
1404
1405                 fop.ors_filter = &af;
1406
1407                 cb.sc_response = playlog_cb;
1408                 fop.o_bd->bd_info = on->on_info->oi_orig;
1409
1410                 for ( i=ndel; i<num; i++ ) {
1411                         if ( uuids[i].bv_len == 0 ) continue;
1412
1413                         mf.f_av_value = uuids[i];
1414                         cb.sc_private = NULL;
1415                         fop.ors_slimit = 1;
1416                         rc = fop.o_bd->be_search( &fop, &frs );
1417
1418                         /* If entry was not found, add to delete list */
1419                         if ( !cb.sc_private ) {
1420                                 uuids[ndel++] = uuids[i];
1421                         }
1422                 }
1423                 fop.o_bd->bd_info = (BackendInfo *)on;
1424         }
1425         if ( ndel ) {
1426                 uuids[ndel].bv_val = NULL;
1427                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1428         }
1429 }
1430
1431 static int
1432 syncprov_op_response( Operation *op, SlapReply *rs )
1433 {
1434         opcookie *opc = op->o_callback->sc_private;
1435         slap_overinst *on = opc->son;
1436         syncprov_info_t         *si = on->on_bi.bi_private;
1437         syncmatches *sm;
1438
1439         if ( rs->sr_err == LDAP_SUCCESS )
1440         {
1441                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1442                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1443
1444                 /* Update our context CSN */
1445                 cbuf[0] = '\0';
1446                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1447                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1448                 if ( !BER_BVISNULL( &maxcsn ) ) {
1449                         strcpy( cbuf, maxcsn.bv_val );
1450                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1451                                 strcpy( si->si_ctxcsnbuf, cbuf );
1452                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1453                         }
1454                 }
1455
1456                 /* Don't do any processing for consumer contextCSN updates */
1457                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1458                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1459                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1460                         return SLAP_CB_CONTINUE;
1461                 }
1462
1463                 si->si_numops++;
1464                 if ( si->si_chkops || si->si_chktime ) {
1465                         int do_check=0;
1466                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1467                                 do_check = 1;
1468                                 si->si_numops = 0;
1469                         }
1470                         if ( si->si_chktime &&
1471                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1472                                 do_check = 1;
1473                                 si->si_chklast = op->o_time;
1474                         }
1475                         if ( do_check ) {
1476                                 syncprov_checkpoint( op, rs, on );
1477                         }
1478                 }
1479                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1480
1481                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1482                 opc->sctxcsn.bv_val = cbuf;
1483
1484                 /* Handle any persistent searches */
1485                 if ( si->si_ops ) {
1486                         switch(op->o_tag) {
1487                         case LDAP_REQ_ADD:
1488                         case LDAP_REQ_MODIFY:
1489                         case LDAP_REQ_MODRDN:
1490                         case LDAP_REQ_EXTENDED:
1491                                 syncprov_matchops( op, opc, 0 );
1492                                 break;
1493                         case LDAP_REQ_DELETE:
1494                                 /* for each match in opc->smatches:
1495                                  *   send DELETE msg
1496                                  */
1497                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1498                                         if ( sm->sm_op->s_op->o_abandon )
1499                                                 continue;
1500                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1501                                 }
1502                                 break;
1503                         }
1504                 }
1505
1506                 /* Add any log records */
1507                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1508                         syncprov_add_slog( op, &curcsn );
1509                 }
1510
1511         }
1512         return SLAP_CB_CONTINUE;
1513 }
1514
1515 /* We don't use a subentry to store the context CSN any more.
1516  * We expose the current context CSN as an operational attribute
1517  * of the suffix entry.
1518  */
1519 static int
1520 syncprov_op_compare( Operation *op, SlapReply *rs )
1521 {
1522         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1523         syncprov_info_t         *si = on->on_bi.bi_private;
1524         int rc = SLAP_CB_CONTINUE;
1525
1526         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1527                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1528         {
1529                 Entry e = {0};
1530                 Attribute a = {0};
1531                 struct berval bv[2];
1532
1533                 e.e_name = op->o_bd->be_suffix[0];
1534                 e.e_nname = op->o_bd->be_nsuffix[0];
1535
1536                 BER_BVZERO( &bv[1] );
1537                 bv[0] = si->si_ctxcsn;
1538
1539                 a.a_desc = slap_schema.si_ad_contextCSN;
1540                 a.a_vals = bv;
1541                 a.a_nvals = a.a_vals;
1542
1543                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1544
1545                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1546                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1547                 if ( ! rs->sr_err ) {
1548                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1549                         goto return_results;
1550                 }
1551
1552                 if ( get_assert( op ) &&
1553                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1554                 {
1555                         rs->sr_err = LDAP_ASSERTION_FAILED;
1556                         goto return_results;
1557                 }
1558
1559
1560                 rs->sr_err = LDAP_COMPARE_FALSE;
1561
1562                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1563                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1564                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1565                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1566                 {
1567                         rs->sr_err = LDAP_COMPARE_TRUE;
1568                 }
1569
1570 return_results:;
1571
1572                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1573
1574                 send_ldap_result( op, rs );
1575
1576                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1577                         rs->sr_err = LDAP_SUCCESS;
1578                 }
1579                 rc = rs->sr_err;
1580         }
1581
1582         return rc;
1583 }
1584
1585 static int
1586 syncprov_op_mod( Operation *op, SlapReply *rs )
1587 {
1588         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1589         syncprov_info_t         *si = on->on_bi.bi_private;
1590
1591         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1592                 sizeof(opcookie) +
1593                 (si->si_ops ? sizeof(modinst) : 0 ),
1594                 op->o_tmpmemctx);
1595         opcookie *opc = (opcookie *)(cb+1);
1596         opc->son = on;
1597         cb->sc_response = syncprov_op_response;
1598         cb->sc_cleanup = syncprov_op_cleanup;
1599         cb->sc_private = opc;
1600         cb->sc_next = op->o_callback;
1601         op->o_callback = cb;
1602
1603         /* If there are active persistent searches, lock this operation.
1604          * See seqmod.c for the locking logic on its own.
1605          */
1606         if ( si->si_ops ) {
1607                 modtarget *mt, mtdummy;
1608                 modinst *mi;
1609
1610                 mi = (modinst *)(opc+1);
1611                 mi->mi_op = op;
1612
1613                 /* See if we're already modifying this entry... */
1614                 mtdummy.mt_op = op;
1615                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1616                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1617                 if ( mt ) {
1618                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1619                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1620                         mt->mt_tail->mi_next = mi;
1621                         mt->mt_tail = mi;
1622                         /* wait for this op to get to head of list */
1623                         while ( mt->mt_mods != mi ) {
1624                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1625                                 ldap_pvt_thread_yield();
1626                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1627
1628                                 /* clean up if the caller is giving up */
1629                                 if ( op->o_abandon ) {
1630                                         modinst *m2;
1631                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1632                                                 m2 = m2->mi_next );
1633                                         m2->mi_next = mi->mi_next;
1634                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1635                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1636                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1637                                         return SLAPD_ABANDON;
1638                                 }
1639                         }
1640                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1641                 } else {
1642                         /* Record that we're modifying this entry now */
1643                         mt = ch_malloc( sizeof(modtarget) );
1644                         mt->mt_mods = mi;
1645                         mt->mt_tail = mi;
1646                         mt->mt_op = mi->mi_op;
1647                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1648                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1649                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1650                 }
1651         }
1652
1653         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1654                 syncprov_matchops( op, opc, 1 );
1655
1656         return SLAP_CB_CONTINUE;
1657 }
1658
1659 static int
1660 syncprov_op_extended( Operation *op, SlapReply *rs )
1661 {
1662         if ( exop_is_write( op ))
1663                 return syncprov_op_mod( op, rs );
1664
1665         return SLAP_CB_CONTINUE;
1666 }
1667
1668 typedef struct searchstate {
1669         slap_overinst *ss_on;
1670         syncops *ss_so;
1671         int ss_present;
1672         struct berval ss_ctxcsn;
1673         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1674 } searchstate;
1675
1676 static int
1677 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1678 {
1679         if ( rs->sr_ctrls ) {
1680                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1681                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1682                 rs->sr_ctrls = NULL;
1683         }
1684         return 0;
1685 }
1686
1687 static void
1688 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1689 {
1690         Operation *op2;
1691         int i, alen = 0;
1692         size_t size;
1693         char *ptr;
1694         GroupAssertion *g1, *g2;
1695
1696         /* count the search attrs */
1697         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1698                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1699         }
1700         /* Make a new copy of the operation */
1701         size = sizeof(Operation) + sizeof(Opheader) +
1702                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1703                 op->o_req_dn.bv_len + 1 +
1704                 op->o_req_ndn.bv_len + 1 +
1705                 op->o_ndn.bv_len + 1 +
1706                 so->s_filterstr.bv_len + 1;
1707         op2 = (Operation *)ch_calloc( 1, size );
1708         op2->o_hdr = (Opheader *)(op2+1);
1709
1710         /* Copy the fields we care about explicitly, leave the rest alone */
1711         *op2->o_hdr = *op->o_hdr;
1712         op2->o_tag = op->o_tag;
1713         op2->o_time = op->o_time;
1714         op2->o_bd = on->on_info->oi_origdb;
1715         op2->o_request = op->o_request;
1716         op2->o_private = on;
1717
1718         if ( i ) {
1719                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1720                 ptr = (char *)(op2->ors_attrs+i+1);
1721                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1722                         op2->ors_attrs[i] = op->ors_attrs[i];
1723                         op2->ors_attrs[i].an_name.bv_val = ptr;
1724                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1725                 }
1726                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1727         } else {
1728                 ptr = (char *)(op2->o_hdr + 1);
1729         }
1730         op2->o_authz = op->o_authz;
1731         op2->o_ndn.bv_val = ptr;
1732         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1733         op2->o_dn = op2->o_ndn;
1734         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1735         op2->o_req_dn.bv_val = ptr;
1736         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1737         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1738         op2->o_req_ndn.bv_val = ptr;
1739         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1740         op2->ors_filterstr.bv_val = ptr;
1741         strcpy( ptr, so->s_filterstr.bv_val );
1742         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1743         op2->ors_filter = str2filter( ptr );
1744         so->s_op = op2;
1745
1746         /* Copy any cached group ACLs individually */
1747         op2->o_groups = NULL;
1748         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1749                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1750                 *g2 = *g1;
1751                 strcpy( g2->ga_ndn, g1->ga_ndn );
1752                 g2->ga_next = op2->o_groups;
1753                 op2->o_groups = g2;
1754         }
1755         /* Don't allow any further group caching */
1756         op2->o_do_not_cache = 1;
1757
1758         /* Add op2 to conn so abandon will find us */
1759         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1760         op->o_conn->c_n_ops_executing++;
1761         op->o_conn->c_n_ops_completed--;
1762         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1763         so->s_flags |= PS_IS_DETACHED;
1764         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1765 }
1766
1767 static int
1768 syncprov_search_response( Operation *op, SlapReply *rs )
1769 {
1770         searchstate *ss = op->o_callback->sc_private;
1771         slap_overinst *on = ss->ss_on;
1772         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1773
1774         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1775                 Attribute *a;
1776                 /* If we got a referral without a referral object, there's
1777                  * something missing that we cannot replicate. Just ignore it.
1778                  * The consumer will abort because we didn't send the expected
1779                  * control.
1780                  */
1781                 if ( !rs->sr_entry ) {
1782                         assert( rs->sr_entry != NULL );
1783                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1784                         return SLAP_CB_CONTINUE;
1785                 }
1786                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1787                 if ( a ) {
1788                         /* Make sure entry is less than the snaphot'd contextCSN */
1789                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1790                                 return LDAP_SUCCESS;
1791
1792                         /* Don't send the ctx entry twice */
1793                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1794                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1795                                 return LDAP_SUCCESS;
1796                 }
1797                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1798                         op->o_tmpmemctx );
1799                 rs->sr_ctrls[1] = NULL;
1800                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1801                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1802         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1803                 struct berval cookie;
1804
1805                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1806                         srs->sr_state.rid );
1807
1808                 /* Is this a regular refresh? */
1809                 if ( !ss->ss_so ) {
1810                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1811                                 op->o_tmpmemctx );
1812                         rs->sr_ctrls[1] = NULL;
1813                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1814                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1815                                         LDAP_SYNC_REFRESH_DELETES );
1816                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1817                 } else {
1818                 /* It's RefreshAndPersist, transition to Persist phase */
1819                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1820                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1821                                 &cookie, 1, NULL, 0 );
1822                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1823
1824                         /* Detach this Op from frontend control */
1825                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1826
1827                         /* Turn off the refreshing flag */
1828                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1829
1830                         syncprov_detach_op( op, ss->ss_so, on );
1831                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1832
1833                         return LDAP_SUCCESS;
1834                 }
1835         }
1836
1837         return SLAP_CB_CONTINUE;
1838 }
1839
1840 static int
1841 syncprov_op_search( Operation *op, SlapReply *rs )
1842 {
1843         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1844         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1845         slap_callback   *cb;
1846         int gotstate = 0, nochange = 0, do_present;
1847         syncops *sop = NULL;
1848         searchstate *ss;
1849         sync_control *srs;
1850         struct berval ctxcsn;
1851         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1852
1853         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1854
1855         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1856                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1857                 return rs->sr_err;
1858         }
1859
1860         do_present = si->si_nopres ? 0 : 1;
1861
1862         srs = op->o_controls[slap_cids.sc_LDAPsync];
1863         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1864
1865         /* If this is a persistent search, set it up right away */
1866         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1867                 syncops so = {0};
1868                 fbase_cookie fc;
1869                 opcookie opc;
1870                 slap_callback sc;
1871
1872                 fc.fss = &so;
1873                 fc.fbase = 0;
1874                 so.s_eid = NOID;
1875                 so.s_op = op;
1876                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1877                 /* syncprov_findbase expects to be called as a callback... */
1878                 sc.sc_private = &opc;
1879                 opc.son = on;
1880                 cb = op->o_callback;
1881                 op->o_callback = &sc;
1882                 rs->sr_err = syncprov_findbase( op, &fc );
1883                 op->o_callback = cb;
1884
1885                 if ( rs->sr_err != LDAP_SUCCESS ) {
1886                         send_ldap_result( op, rs );
1887                         return rs->sr_err;
1888                 }
1889                 sop = ch_malloc( sizeof( syncops ));
1890                 *sop = so;
1891                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1892                 sop->s_rid = srs->sr_state.rid;
1893                 sop->s_inuse = 1;
1894
1895                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1896                 sop->s_next = si->si_ops;
1897                 si->si_ops = sop;
1898                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1899         }
1900
1901         /* snapshot the ctxcsn */
1902         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1903         strcpy( csnbuf, si->si_ctxcsnbuf );
1904         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1905         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1906         ctxcsn.bv_val = csnbuf;
1907
1908         /* If we have a cookie, handle the PRESENT lookups */
1909         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1910                 sessionlog *sl;
1911
1912                 /* The cookie was validated when it was parsed, just use it */
1913
1914                 /* If just Refreshing and nothing has changed, shortcut it */
1915                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1916                         nochange = 1;
1917                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1918                                 LDAPControl     *ctrls[2];
1919
1920                                 ctrls[0] = NULL;
1921                                 ctrls[1] = NULL;
1922                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1923                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1924                                 rs->sr_ctrls = ctrls;
1925                                 rs->sr_err = LDAP_SUCCESS;
1926                                 send_ldap_result( op, rs );
1927                                 rs->sr_ctrls = NULL;
1928                                 return rs->sr_err;
1929                         }
1930                         goto shortcut;
1931                 }
1932                 /* Do we have a sessionlog for this search? */
1933                 sl=si->si_logs;
1934                 if ( sl ) {
1935                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1936                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1937                                 do_present = 0;
1938                                 /* mutex is unlocked in playlog */
1939                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1940                         } else {
1941                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1942                         }
1943                 }
1944                 /* Is the CSN still present in the database? */
1945                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1946                         /* No, so a reload is required */
1947                         /* the 2.2 consumer doesn't send this hint */
1948                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1949                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1950                                 return rs->sr_err;
1951                         }
1952                 } else {
1953                         gotstate = 1;
1954                         /* If changed and doing Present lookup, send Present UUIDs */
1955                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1956                                 LDAP_SUCCESS ) {
1957                                 send_ldap_result( op, rs );
1958                                 return rs->sr_err;
1959                         }
1960                 }
1961         }
1962
1963 shortcut:
1964         /* Append CSN range to search filter, save original filter
1965          * for persistent search evaluation
1966          */
1967         if ( sop ) {
1968                 sop->s_filterstr= op->ors_filterstr;
1969         }
1970
1971         /* If something changed, find the changes */
1972         if ( gotstate && !nochange ) {
1973                 Filter *fand, *fava;
1974
1975                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1976                 fand->f_choice = LDAP_FILTER_AND;
1977                 fand->f_next = NULL;
1978                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1979                 fand->f_and = fava;
1980                 fava->f_choice = LDAP_FILTER_GE;
1981                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1982                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1983 #ifdef LDAP_COMP_MATCH
1984                 fava->f_ava->aa_cf = NULL;
1985 #endif
1986                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1987                 fava->f_next = op->ors_filter;
1988                 op->ors_filter = fand;
1989                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1990         }
1991
1992         /* Let our callback add needed info to returned entries */
1993         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1994         ss = (searchstate *)(cb+1);
1995         ss->ss_on = on;
1996         ss->ss_so = sop;
1997         ss->ss_present = do_present;
1998         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
1999         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2000         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2001         cb->sc_response = syncprov_search_response;
2002         cb->sc_cleanup = syncprov_search_cleanup;
2003         cb->sc_private = ss;
2004         cb->sc_next = op->o_callback;
2005         op->o_callback = cb;
2006
2007 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2008         op->o_sync_mode &= SLAP_CONTROL_MASK;
2009 #endif
2010
2011         /* If this is a persistent search and no changes were reported during
2012          * the refresh phase, just invoke the response callback to transition
2013          * us into persist phase
2014          */
2015         if ( nochange ) {
2016                 rs->sr_err = LDAP_SUCCESS;
2017                 rs->sr_nentries = 0;
2018                 send_ldap_result( op, rs );
2019                 return rs->sr_err;
2020         }
2021         return SLAP_CB_CONTINUE;
2022 }
2023
2024 static int
2025 syncprov_operational(
2026         Operation *op,
2027         SlapReply *rs )
2028 {
2029         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2030         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2031
2032         if ( rs->sr_entry &&
2033                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2034
2035                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2036                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2037                         Attribute *a, **ap = NULL;
2038
2039                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2040                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2041                                         break;
2042                         }
2043
2044                         if ( !a ) {
2045                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2046
2047                                 a = ch_malloc( sizeof(Attribute));
2048                                 a->a_desc = slap_schema.si_ad_contextCSN;
2049                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2050                                 a->a_vals[1].bv_val = NULL;
2051                                 a->a_nvals = a->a_vals;
2052                                 a->a_next = NULL;
2053                                 a->a_flags = 0;
2054                                 *ap = a;
2055                         }
2056
2057                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2058                         if ( !ap ) {
2059                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2060                         } else {
2061                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2062                         }
2063                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2064                 }
2065         }
2066         return SLAP_CB_CONTINUE;
2067 }
2068
2069 enum {
2070         SP_CHKPT = 1,
2071         SP_SESSL,
2072         SP_NOPRES,
2073         SP_USEHINT
2074 };
2075
2076 static ConfigDriver sp_cf_gen;
2077
2078 static ConfigTable spcfg[] = {
2079         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2080                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2081                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2082                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2083         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2084                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2085                         "DESC 'Session log size in ops' "
2086                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2087         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2088                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2089                         "DESC 'Omit Present phase processing' "
2090                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2091         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2092                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2093                         "DESC 'Observe Reload Hint in Request control' "
2094                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2095         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2096 };
2097
2098 static ConfigOCs spocs[] = {
2099         { "( OLcfgOvOc:1.1 "
2100                 "NAME 'olcSyncProvConfig' "
2101                 "DESC 'SyncRepl Provider configuration' "
2102                 "SUP olcOverlayConfig "
2103                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2104                         Cft_Overlay, spcfg },
2105         { NULL, 0, NULL }
2106 };
2107
2108 static int
2109 sp_cf_gen(ConfigArgs *c)
2110 {
2111         slap_overinst           *on = (slap_overinst *)c->bi;
2112         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2113         int rc = 0;
2114
2115         if ( c->op == SLAP_CONFIG_EMIT ) {
2116                 switch ( c->type ) {
2117                 case SP_CHKPT:
2118                         if ( si->si_chkops || si->si_chktime ) {
2119                                 struct berval bv;
2120                                 bv.bv_len = sprintf( c->msg, "%d %d",
2121                                         si->si_chkops, si->si_chktime );
2122                                 bv.bv_val = c->msg;
2123                                 value_add_one( &c->rvalue_vals, &bv );
2124                         } else {
2125                                 rc = 1;
2126                         }
2127                         break;
2128                 case SP_SESSL:
2129                         if ( si->si_logs ) {
2130                                 c->value_int = si->si_logs->sl_size;
2131                         } else {
2132                                 rc = 1;
2133                         }
2134                         break;
2135                 case SP_NOPRES:
2136                         if ( si->si_nopres ) {
2137                                 c->value_int = 1;
2138                         } else {
2139                                 rc = 1;
2140                         }
2141                         break;
2142                 case SP_USEHINT:
2143                         if ( si->si_usehint ) {
2144                                 c->value_int = 1;
2145                         } else {
2146                                 rc = 1;
2147                         }
2148                         break;
2149                 }
2150                 return rc;
2151         } else if ( c->op == LDAP_MOD_DELETE ) {
2152                 switch ( c->type ) {
2153                 case SP_CHKPT:
2154                         si->si_chkops = 0;
2155                         si->si_chktime = 0;
2156                         break;
2157                 case SP_SESSL:
2158                         if ( si->si_logs )
2159                                 si->si_logs->sl_size = 0;
2160                         else
2161                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2162                         break;
2163                 case SP_NOPRES:
2164                         if ( si->si_nopres )
2165                                 si->si_nopres = 0;
2166                         else
2167                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2168                         break;
2169                 case SP_USEHINT:
2170                         if ( si->si_usehint )
2171                                 si->si_usehint = 0;
2172                         else
2173                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2174                         break;
2175                 }
2176                 return rc;
2177         }
2178         switch ( c->type ) {
2179         case SP_CHKPT:
2180                 si->si_chkops = atoi( c->argv[1] );
2181                 si->si_chktime = atoi( c->argv[2] ) * 60;
2182                 break;
2183         case SP_SESSL: {
2184                 sessionlog *sl;
2185                 int size = c->value_int;
2186
2187                 if ( size < 0 ) {
2188                         sprintf( c->msg, "%s size %d is negative",
2189                                 c->argv[0], size );
2190                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2191                         return ARG_BAD_CONF;
2192                 }
2193                 sl = si->si_logs;
2194                 if ( !sl ) {
2195                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2196                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2197                         sl->sl_mincsn.bv_len = 0;
2198                         sl->sl_num = 0;
2199                         sl->sl_head = sl->sl_tail = NULL;
2200                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2201                         si->si_logs = sl;
2202                 }
2203                 sl->sl_size = size;
2204                 }
2205                 break;
2206         case SP_NOPRES:
2207                 si->si_nopres = c->value_int;
2208                 break;
2209         case SP_USEHINT:
2210                 si->si_usehint = c->value_int;
2211                 break;
2212         }
2213         return rc;
2214 }
2215
2216 /* ITS#3456 we cannot run this search on the main thread, must use a
2217  * child thread in order to insure we have a big enough stack.
2218  */
2219 static void *
2220 syncprov_db_otask(
2221         void *ptr
2222 )
2223 {
2224         syncprov_findcsn( ptr, FIND_MAXCSN );
2225         return NULL;
2226 }
2227
2228 /* Read any existing contextCSN from the underlying db.
2229  * Then search for any entries newer than that. If no value exists,
2230  * just generate it. Cache whatever result.
2231  */
2232 static int
2233 syncprov_db_open(
2234     BackendDB *be
2235 )
2236 {
2237         slap_overinst   *on = (slap_overinst *) be->bd_info;
2238         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2239
2240         Connection conn;
2241         OperationBuffer opbuf;
2242         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2243         Operation *op = (Operation *) &opbuf;
2244         Entry *e;
2245         Attribute *a;
2246         int rc;
2247         void *thrctx = NULL;
2248
2249         if ( slapMode & SLAP_TOOL_MODE ) {
2250                 return 0;
2251         }
2252
2253         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2254         if ( rc ) {
2255                 return rc;
2256         }
2257
2258         thrctx = ldap_pvt_thread_pool_context();
2259         connection_fake_init( &conn, op, thrctx );
2260         op->o_bd = be;
2261         op->o_dn = be->be_rootdn;
2262         op->o_ndn = be->be_rootndn;
2263
2264         ctxcsnbuf[0] = '\0';
2265
2266         op->o_bd->bd_info = on->on_info->oi_orig;
2267         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2268                 slap_schema.si_ad_contextCSN, 0, &e );
2269
2270         if ( e ) {
2271                 ldap_pvt_thread_t tid;
2272
2273                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2274                 if ( a ) {
2275                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2276                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2277                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2278                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2279                                 si->si_ctxcsn.bv_len );
2280                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2281                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2282                 }
2283                 be_entry_release_rw( op, e, 0 );
2284                 op->o_bd->bd_info = (BackendInfo *)on;
2285                 op->o_req_dn = be->be_suffix[0];
2286                 op->o_req_ndn = be->be_nsuffix[0];
2287                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2288                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2289                 ldap_pvt_thread_join( tid, NULL );
2290         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2291                 /* If we're also a consumer, and we didn't find the context entry,
2292                  * then don't generate anything, wait for our provider to send it
2293                  * to us.
2294                  */
2295                 goto out;
2296         }
2297
2298         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2299                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2300                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2301         }
2302
2303         /* If our ctxcsn is different from what was read from the root
2304          * entry, make sure we do a checkpoint on close
2305          */
2306         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2307                 si->si_numops++;
2308         }
2309
2310 out:
2311         op->o_bd->bd_info = (BackendInfo *)on;
2312         ldap_pvt_thread_pool_context_reset( thrctx );
2313         return 0;
2314 }
2315
2316 /* Write the current contextCSN into the underlying db.
2317  */
2318 static int
2319 syncprov_db_close(
2320     BackendDB *be
2321 )
2322 {
2323     slap_overinst   *on = (slap_overinst *) be->bd_info;
2324     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2325
2326         if ( slapMode & SLAP_TOOL_MODE ) {
2327                 return 0;
2328         }
2329         if ( si->si_numops ) {
2330                 Connection conn;
2331                 OperationBuffer opbuf;
2332                 Operation *op = (Operation *) &opbuf;
2333                 SlapReply rs = {REP_RESULT};
2334                 void *thrctx;
2335
2336                 thrctx = ldap_pvt_thread_pool_context();
2337                 connection_fake_init( &conn, op, thrctx );
2338                 op->o_bd = be;
2339                 op->o_dn = be->be_rootdn;
2340                 op->o_ndn = be->be_rootndn;
2341                 syncprov_checkpoint( op, &rs, on );
2342                 ldap_pvt_thread_pool_context_reset( thrctx );
2343         }
2344
2345     return 0;
2346 }
2347
2348 static int
2349 syncprov_db_init(
2350         BackendDB *be
2351 )
2352 {
2353         slap_overinst   *on = (slap_overinst *)be->bd_info;
2354         syncprov_info_t *si;
2355
2356         si = ch_calloc(1, sizeof(syncprov_info_t));
2357         on->on_bi.bi_private = si;
2358         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2359         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2360         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2361         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2362
2363         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2364         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2365         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2366         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2367
2368         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2369         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2370
2371         return 0;
2372 }
2373
2374 static int
2375 syncprov_db_destroy(
2376         BackendDB *be
2377 )
2378 {
2379         slap_overinst   *on = (slap_overinst *)be->bd_info;
2380         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2381
2382         if ( si ) {
2383                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2384                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2385                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2386                 ch_free( si );
2387         }
2388
2389         return 0;
2390 }
2391
2392 static int syncprov_parseCtrl (
2393         Operation *op,
2394         SlapReply *rs,
2395         LDAPControl *ctrl )
2396 {
2397         ber_tag_t tag;
2398         BerElementBuffer berbuf;
2399         BerElement *ber = (BerElement *)&berbuf;
2400         ber_int_t mode;
2401         ber_len_t len;
2402         struct berval cookie = BER_BVNULL;
2403         sync_control *sr;
2404         int rhint = 0;
2405
2406         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2407                 rs->sr_text = "Sync control specified multiple times";
2408                 return LDAP_PROTOCOL_ERROR;
2409         }
2410
2411         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2412                 rs->sr_text = "Sync control specified with pagedResults control";
2413                 return LDAP_PROTOCOL_ERROR;
2414         }
2415
2416         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2417                 rs->sr_text = "Sync control value is empty (or absent)";
2418                 return LDAP_PROTOCOL_ERROR;
2419         }
2420
2421         /* Parse the control value
2422          *      syncRequestValue ::= SEQUENCE {
2423          *              mode   ENUMERATED {
2424          *                      -- 0 unused
2425          *                      refreshOnly             (1),
2426          *                      -- 2 reserved
2427          *                      refreshAndPersist       (3)
2428          *              },
2429          *              cookie  syncCookie OPTIONAL
2430          *      }
2431          */
2432
2433         ber_init2( ber, &ctrl->ldctl_value, 0 );
2434
2435         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2436                 rs->sr_text = "Sync control : mode decoding error";
2437                 return LDAP_PROTOCOL_ERROR;
2438         }
2439
2440         switch( mode ) {
2441         case LDAP_SYNC_REFRESH_ONLY:
2442                 mode = SLAP_SYNC_REFRESH;
2443                 break;
2444         case LDAP_SYNC_REFRESH_AND_PERSIST:
2445                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2446                 break;
2447         default:
2448                 rs->sr_text = "Sync control : unknown update mode";
2449                 return LDAP_PROTOCOL_ERROR;
2450         }
2451
2452         tag = ber_peek_tag( ber, &len );
2453
2454         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2455                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2456                         rs->sr_text = "Sync control : cookie decoding error";
2457                         return LDAP_PROTOCOL_ERROR;
2458                 }
2459                 tag = ber_peek_tag( ber, &len );
2460         }
2461         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2462                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2463                         rs->sr_text = "Sync control : rhint decoding error";
2464                         return LDAP_PROTOCOL_ERROR;
2465                 }
2466         }
2467         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2468                         rs->sr_text = "Sync control : decoding error";
2469                         return LDAP_PROTOCOL_ERROR;
2470         }
2471         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2472         sr->sr_rhint = rhint;
2473         if (!BER_BVISNULL(&cookie)) {
2474                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2475                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2476                 if ( sr->sr_state.rid == -1 ) {
2477                         rs->sr_text = "Sync control : cookie parsing error";
2478                         return LDAP_PROTOCOL_ERROR;
2479                 }
2480         }
2481
2482         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2483
2484         op->o_sync = ctrl->ldctl_iscritical
2485                 ? SLAP_CONTROL_CRITICAL
2486                 : SLAP_CONTROL_NONCRITICAL;
2487
2488         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2489
2490         return LDAP_SUCCESS;
2491 }
2492
2493 /* This overlay is set up for dynamic loading via moduleload. For static
2494  * configuration, you'll need to arrange for the slap_overinst to be
2495  * initialized and registered by some other function inside slapd.
2496  */
2497
2498 static slap_overinst            syncprov;
2499
2500 int
2501 syncprov_init()
2502 {
2503         int rc;
2504
2505         rc = register_supported_control( LDAP_CONTROL_SYNC,
2506                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2507                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2508         if ( rc != LDAP_SUCCESS ) {
2509                 Debug( LDAP_DEBUG_ANY,
2510                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2511                 return rc;
2512         }
2513
2514         syncprov.on_bi.bi_type = "syncprov";
2515         syncprov.on_bi.bi_db_init = syncprov_db_init;
2516         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2517         syncprov.on_bi.bi_db_open = syncprov_db_open;
2518         syncprov.on_bi.bi_db_close = syncprov_db_close;
2519
2520         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2521         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2522
2523         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2524         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2525         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2526         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2527         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2528         syncprov.on_bi.bi_op_search = syncprov_op_search;
2529         syncprov.on_bi.bi_extended = syncprov_op_extended;
2530         syncprov.on_bi.bi_operational = syncprov_operational;
2531
2532         syncprov.on_bi.bi_cf_ocs = spocs;
2533
2534         rc = config_register_schema( spcfg, spocs );
2535         if ( rc ) return rc;
2536
2537         return overlay_register( &syncprov );
2538 }
2539
2540 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2541 int
2542 init_module( int argc, char *argv[] )
2543 {
2544         return syncprov_init();
2545 }
2546 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2547
2548 #endif /* defined(SLAPD_OVER_SYNCPROV) */