From: Howard Chu Date: Mon, 29 Nov 2004 20:55:50 +0000 (+0000) Subject: Backglue hastily modified as an overlay X-Git-Tag: OPENLDAP_REL_ENG_2_3_0ALPHA~175 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=ad9f3ebe34221b1221b1455d64f033804588d1b0;p=openldap Backglue hastily modified as an overlay --- diff --git a/servers/slapd/overlays/glue.c b/servers/slapd/overlays/glue.c new file mode 100644 index 0000000000..6c64d6cfdd --- /dev/null +++ b/servers/slapd/overlays/glue.c @@ -0,0 +1,694 @@ +/* glue.c - backend glue overlay */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software . + * + * Copyright 2001-2004 The OpenLDAP Foundation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted only as authorized by the OpenLDAP + * Public License. + * + * A copy of this license is available in the file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * . + */ + +/* + * Functions to glue a bunch of other backends into a single tree. + * All of the glued backends must share a common suffix. E.g., you + * can glue o=foo and ou=bar,o=foo but you can't glue o=foo and o=bar. + * + * The purpose of these functions is to allow you to split a single database + * into pieces (for load balancing purposes, whatever) but still be able + * to treat it as a single database after it's been split. As such, each + * of the glued backends should have identical rootdn. + * -- Howard Chu + */ + +#include "portable.h" + +#ifdef SLAPD_OVER_GLUE + +#include + +#include +#include + +#define SLAPD_TOOLS +#include "slap.h" + +typedef struct gluenode { + BackendDB *gn_be; + int gn_bx; + struct berval gn_pdn; + int gn_async; +} gluenode; + +typedef struct glueinfo { + int gi_nodes; + struct berval gi_pdn; + gluenode gi_n[1]; +} glueinfo; + +static slap_overinst glue; + +static int glueMode; +static BackendDB *glueBack; + +static slap_response glue_op_response; + +/* Just like select_backend, but only for our backends */ +static BackendDB * +glue_back_select ( + BackendDB *be, + struct berval *dn +) +{ + slap_overinst *on = (slap_overinst *)be->bd_info; + glueinfo *gi = (glueinfo *)on->on_bi.bi_private; + int i; + + for (i = 0; igi_nodes; i++) { + assert( gi->gi_n[i].gn_be->be_nsuffix ); + + if (dnIsSuffix(dn, &gi->gi_n[i].gn_be->be_nsuffix[0])) { + return gi->gi_n[i].gn_be; + } + } + be->bd_info = on->on_info->oi_orig; + return be; +} + + +typedef struct glue_state { + int err; + int slimit; + int matchlen; + char *matched; + int nrefs; + BerVarray refs; +} glue_state; + +static int +glue_op_response ( Operation *op, SlapReply *rs ) +{ + glue_state *gs = op->o_callback->sc_private; + + switch(rs->sr_type) { + case REP_SEARCH: + if ( gs->slimit != SLAP_NO_LIMIT + && rs->sr_nentries >= gs->slimit ) + { + rs->sr_err = gs->err = LDAP_SIZELIMIT_EXCEEDED; + return -1; + } + /* fallthru */ + case REP_SEARCHREF: + return SLAP_CB_CONTINUE; + + default: + if (rs->sr_err == LDAP_SUCCESS || + rs->sr_err == LDAP_SIZELIMIT_EXCEEDED || + rs->sr_err == LDAP_TIMELIMIT_EXCEEDED || + rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED || + rs->sr_err == LDAP_NO_SUCH_OBJECT || + gs->err != LDAP_SUCCESS) + gs->err = rs->sr_err; + if (gs->err == LDAP_SUCCESS && gs->matched) { + ch_free (gs->matched); + gs->matched = NULL; + gs->matchlen = 0; + } + if (gs->err != LDAP_SUCCESS && rs->sr_matched) { + int len; + len = strlen (rs->sr_matched); + if (len > gs->matchlen) { + if (gs->matched) + ch_free (gs->matched); + gs->matched = ch_strdup (rs->sr_matched); + gs->matchlen = len; + } + } + if (rs->sr_ref) { + int i, j, k; + BerVarray new; + + for (i=0; rs->sr_ref[i].bv_val; i++); + + j = gs->nrefs; + if (!j) { + new = ch_malloc ((i+1)*sizeof(struct berval)); + } else { + new = ch_realloc(gs->refs, + (j+i+1)*sizeof(struct berval)); + } + for (k=0; ksr_ref[k] ); + } + new[j].bv_val = NULL; + gs->nrefs = j; + gs->refs = new; + } + } + return 0; +} + +static int +glue_op_search ( Operation *op, SlapReply *rs ) +{ + slap_overinst *on = (slap_overinst *)op->o_bd->bd_info; + glueinfo *gi = (glueinfo *)on->on_bi.bi_private; + BackendDB *b0 = op->o_bd; + BackendDB *b1 = NULL, *btmp; + BackendInfo *bi0 = op->o_bd->bd_info; + int i; + long stoptime = 0; + glue_state gs = {0, 0, 0, NULL, 0, NULL}; + slap_callback cb = { NULL, glue_op_response, NULL, NULL }; + int scope0, slimit0, tlimit0; + struct berval dn, ndn, *pdn; + + cb.sc_private = &gs; + + cb.sc_next = op->o_callback; + + stoptime = slap_get_time () + op->ors_tlimit; + + op->o_bd = glue_back_select (b0, &op->o_req_ndn); + b0->bd_info = on->on_info->oi_orig; + + switch (op->ors_scope) { + case LDAP_SCOPE_BASE: + return SLAP_CB_CONTINUE; + + case LDAP_SCOPE_ONELEVEL: + case LDAP_SCOPE_SUBTREE: +#ifdef LDAP_SCOPE_SUBORDINATE + case LDAP_SCOPE_SUBORDINATE: /* FIXME */ +#endif + + if ( op->o_sync ) { + if (op->o_bd && op->o_bd->be_search) { + rs->sr_err = op->o_bd->be_search( op, rs ); + } else { + send_ldap_error(op, rs, LDAP_UNWILLING_TO_PERFORM, + "No search target found"); + } + return rs->sr_err; + } + + op->o_callback = &cb; + rs->sr_err = gs.err = LDAP_UNWILLING_TO_PERFORM; + scope0 = op->ors_scope; + slimit0 = gs.slimit = op->ors_slimit; + tlimit0 = op->ors_tlimit; + dn = op->o_req_dn; + ndn = op->o_req_ndn; + b1 = op->o_bd; + + /* + * Execute in reverse order, most general first + */ + for (i = gi->gi_nodes; i >= 0; i--) { + if ( i == gi->gi_nodes ) { + btmp = b0; + pdn = &gi->gi_pdn; + } else { + btmp = gi->gi_n[i].gn_be; + pdn = &gi->gi_n[i].gn_pdn; + } + if (!btmp || !btmp->be_search) + continue; + if (!dnIsSuffix(&btmp->be_nsuffix[0], &b1->be_nsuffix[0])) + continue; + if (tlimit0 != SLAP_NO_LIMIT) { + op->ors_tlimit = stoptime - slap_get_time (); + if (op->ors_tlimit <= 0) { + rs->sr_err = gs.err = LDAP_TIMELIMIT_EXCEEDED; + break; + } + } + if (slimit0 != SLAP_NO_LIMIT) { + op->ors_slimit = slimit0 - rs->sr_nentries; + if (op->ors_slimit < 0) { + rs->sr_err = gs.err = LDAP_SIZELIMIT_EXCEEDED; + break; + } + } + rs->sr_err = 0; + /* + * check for abandon + */ + if (op->o_abandon) { + goto end_of_loop; + } + op->o_bd = btmp; + + assert( op->o_bd->be_suffix ); + assert( op->o_bd->be_nsuffix ); + + if (scope0 == LDAP_SCOPE_ONELEVEL && + dn_match(pdn, &ndn)) + { + op->ors_scope = LDAP_SCOPE_BASE; + op->o_req_dn = op->o_bd->be_suffix[0]; + op->o_req_ndn = op->o_bd->be_nsuffix[0]; + rs->sr_err = op->o_bd->be_search(op, rs); + + } else if (scope0 == LDAP_SCOPE_SUBTREE && + dn_match(&op->o_bd->be_nsuffix[0], &ndn)) + { + rs->sr_err = op->o_bd->be_search( op, rs ); + + } else if (scope0 == LDAP_SCOPE_SUBTREE && + dnIsSuffix(&op->o_bd->be_nsuffix[0], &ndn)) + { + op->o_req_dn = op->o_bd->be_suffix[0]; + op->o_req_ndn = op->o_bd->be_nsuffix[0]; + rs->sr_err = op->o_bd->be_search( op, rs ); + if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { + gs.err = LDAP_SUCCESS; + } + + } else if (dnIsSuffix(&ndn, &op->o_bd->be_nsuffix[0])) { + rs->sr_err = op->o_bd->be_search( op, rs ); + } + + switch ( gs.err ) { + + /* + * Add errors that should result in dropping + * the search + */ + case LDAP_SIZELIMIT_EXCEEDED: + case LDAP_TIMELIMIT_EXCEEDED: + case LDAP_ADMINLIMIT_EXCEEDED: + case LDAP_NO_SUCH_OBJECT: + goto end_of_loop; + + default: + break; + } + } +end_of_loop:; + op->ors_scope = scope0; + op->ors_slimit = slimit0; + op->ors_tlimit = tlimit0; + op->o_req_dn = dn; + op->o_req_ndn = ndn; + + break; + } + if ( !op->o_abandon ) { + op->o_callback = cb.sc_next; + rs->sr_err = gs.err; + rs->sr_matched = gs.matched; + rs->sr_ref = gs.refs; + + send_ldap_result( op, rs ); + } + + op->o_bd = b0; + op->o_bd->bd_info = bi0; + if (gs.matched) + free (gs.matched); + if (gs.refs) + ber_bvarray_free(gs.refs); + return rs->sr_err; +} + +static BackendDB toolDB; + +static int +glue_tool_entry_open ( + BackendDB *b0, + int mode +) +{ + slap_overinfo *oi = (slap_overinfo *)b0->bd_info; + + /* We don't know which backend to talk to yet, so just + * remember the mode and move on... + */ + + glueMode = mode; + glueBack = NULL; + toolDB = *b0; + toolDB.bd_info = oi->oi_orig; + + return 0; +} + +static int +glue_tool_entry_close ( + BackendDB *b0 +) +{ + int rc = 0; + + if (glueBack) { + if (!glueBack->be_entry_close) + return 0; + rc = glueBack->be_entry_close (glueBack); + } + return rc; +} + +static slap_overinst * +glue_tool_inst( + BackendInfo *bi +) +{ + slap_overinfo *oi = (slap_overinfo *)bi; + slap_overinst *on; + + for ( on = oi->oi_list; on; on=on->on_next ) { + if ( !strcmp( on->on_bi.bi_type, glue.on_bi.bi_type )) + return on; + } + return NULL; +} + +/* This function will only be called in tool mode */ +static int +glue_open ( + BackendInfo *bi +) +{ + slap_overinst *on = glue_tool_inst( bi ); + glueinfo *gi = on->on_bi.bi_private; + int i, rc = 0; + + /* If we were invoked in tool mode, open all the underlying backends */ + if (slapMode & SLAP_TOOL_MODE) { + for ( i=0; igi_nodes; i++ ) { + gi->gi_n[i].gn_be = backendDB + gi->gi_n[i].gn_bx; + rc = backend_startup( gi->gi_n[i].gn_be ); + if ( rc ) break; + } + } /* other case is impossible */ + return rc; +} + +/* This function will only be called in tool mode */ +static int +glue_close ( + BackendInfo *bi +) +{ + slap_overinst *on = glue_tool_inst( bi ); + glueinfo *gi = on->on_bi.bi_private; + int i, rc = 0; + + if (slapMode & SLAP_TOOL_MODE) { + for ( i=0; igi_nodes; i++ ) { + rc = backend_shutdown( gi->gi_n[i].gn_be ); + if ( rc ) break; + } + } + return rc; +} + +static ID +glue_tool_entry_first ( + BackendDB *b0 +) +{ + slap_overinst *on = glue_tool_inst( b0->bd_info ); + glueinfo *gi = on->on_bi.bi_private; + int i; + + /* If we're starting from scratch, start at the most general */ + if (!glueBack) { + if ( toolDB.be_entry_open && toolDB.be_entry_first ) { + glueBack = &toolDB; + } else { + for (i = gi->gi_nodes-1; i >= 0; i--) { + if (gi->gi_n[i].gn_be->be_entry_open && + gi->gi_n[i].gn_be->be_entry_first) { + glueBack = gi->gi_n[i].gn_be; + break; + } + } + } + } + if (!glueBack || !glueBack->be_entry_open || !glueBack->be_entry_first || + glueBack->be_entry_open (glueBack, glueMode) != 0) + return NOID; + + return glueBack->be_entry_first (glueBack); +} + +static ID +glue_tool_entry_next ( + BackendDB *b0 +) +{ + slap_overinst *on = glue_tool_inst( b0->bd_info ); + glueinfo *gi = on->on_bi.bi_private; + int i; + ID rc; + + if (!glueBack || !glueBack->be_entry_next) + return NOID; + + rc = glueBack->be_entry_next (glueBack); + + /* If we ran out of entries in one database, move on to the next */ + while (rc == NOID) { + if ( glueBack && glueBack->be_entry_close ) + glueBack->be_entry_close (glueBack); + for (i=0; igi_nodes; i++) { + if (gi->gi_n[i].gn_be == glueBack) + break; + } + if (i == 0) { + glueBack = NULL; + break; + } else { + glueBack = gi->gi_n[i-1].gn_be; + rc = glue_tool_entry_first (b0); + } + } + return rc; +} + +static Entry * +glue_tool_entry_get ( + BackendDB *b0, + ID id +) +{ + if (!glueBack || !glueBack->be_entry_get) + return NULL; + + return glueBack->be_entry_get (glueBack, id); +} + +static ID +glue_tool_entry_put ( + BackendDB *b0, + Entry *e, + struct berval *text +) +{ + BackendDB *be, b2; + int rc; + + b2 = *b0; + b2.bd_info = (BackendInfo *)glue_tool_inst( b0->bd_info ); + be = glue_back_select (&b2, &e->e_nname); + if ( be == &b2 ) be = &toolDB; + + if (!be->be_entry_put) + return NOID; + + if (!glueBack) { + rc = be->be_entry_open (be, glueMode); + if (rc != 0) + return NOID; + } else if (be != glueBack) { + /* If this entry belongs in a different branch than the + * previous one, close the current database and open the + * new one. + */ + glueBack->be_entry_close (glueBack); + rc = be->be_entry_open (be, glueMode); + if (rc != 0) + return NOID; + } + glueBack = be; + return be->be_entry_put (be, e, text); +} + +static int +glue_tool_entry_reindex ( + BackendDB *b0, + ID id +) +{ + if (!glueBack || !glueBack->be_entry_reindex) + return -1; + + return glueBack->be_entry_reindex (glueBack, id); +} + +static int +glue_tool_sync ( + BackendDB *b0 +) +{ + slap_overinst *on = glue_tool_inst( b0->bd_info ); + glueinfo *gi = on->on_bi.bi_private; + int i; + + /* just sync everyone */ + for (i = 0; igi_nodes; i++) + if (gi->gi_n[i].gn_be->be_sync) + gi->gi_n[i].gn_be->be_sync (gi->gi_n[i].gn_be); + return 0; +} + +static int +glue_db_init( + BackendDB *be +) +{ + slap_overinst *on = (slap_overinst *)be->bd_info; + slap_overinfo *oi = on->on_info; + glueinfo *gi; + + gi = ch_calloc( 1, sizeof(glueinfo)); + on->on_bi.bi_private = gi; + dnParent( be->be_nsuffix, &gi->gi_pdn ); + + /* Currently the overlay framework doesn't handle these entry points + * but we need them.... + */ + oi->oi_bi.bi_open = glue_open; + oi->oi_bi.bi_close = glue_close; + + oi->oi_bi.bi_tool_entry_open = glue_tool_entry_open; + oi->oi_bi.bi_tool_entry_close = glue_tool_entry_close; + oi->oi_bi.bi_tool_entry_first = glue_tool_entry_first; + oi->oi_bi.bi_tool_entry_next = glue_tool_entry_next; + oi->oi_bi.bi_tool_entry_get = glue_tool_entry_get; + oi->oi_bi.bi_tool_entry_put = glue_tool_entry_put; + oi->oi_bi.bi_tool_entry_reindex = glue_tool_entry_reindex; + oi->oi_bi.bi_tool_sync = glue_tool_sync; + + /*FIXME : need to add support */ + oi->oi_bi.bi_tool_dn2id_get = 0; + oi->oi_bi.bi_tool_id2entry_get = 0; + oi->oi_bi.bi_tool_entry_modify = 0; + + return 0; +} + +static int +glue_db_destroy ( + BackendDB *be +) +{ + slap_overinst *on = (slap_overinst *)be->bd_info; + glueinfo *gi = (glueinfo *)on->on_bi.bi_private; + + free (gi); + return SLAP_CB_CONTINUE; +} + +static int +glue_db_open ( + BackendDB *be +) +{ + slap_overinst *on = (slap_overinst *)be->bd_info; + glueinfo *gi = (glueinfo *)on->on_bi.bi_private; + int i; + + for ( i=0; igi_nodes; i++ ) { + gi->gi_n[i].gn_be = backendDB + gi->gi_n[i].gn_bx; + } + return 0; +} + +static int +glue_db_config( + BackendDB *be, + const char *fname, + int lineno, + int argc, + char **argv +) +{ + slap_overinst *on = (slap_overinst *)be->bd_info; + glueinfo *gi = (glueinfo *)on->on_bi.bi_private; + + if ( strcasecmp( argv[0], "glue-sub" ) == 0 ) { + int async = 0; + BackendDB *b2; + struct berval bv, dn; + gluenode *gn; + + if ( argc < 2 ) { + fprintf( stderr, "%s: line %d: too few arguments in " + "\"glue-sub [async]\"\n", fname, lineno ); + return -1; + } + if ( argc == 3 ) { + if ( strcasecmp( argv[2], "async" )) { + fprintf( stderr, "%s: line %d: unrecognized option " + "\"%s\" ignored.\n", fname, lineno, argv[2] ); + } else { + async = 1; + } + } + ber_str2bv( argv[1], 0, 0, &bv ); + if ( dnNormalize( 0, NULL, NULL, &bv, &dn, NULL )) { + fprintf( stderr, "invalid suffixDN \"%s\"\n", argv[1] ); + return -1; + } + b2 = select_backend( &dn, 0, 1 ); + if ( !b2 ) { + fprintf( stderr, "%s: line %d: unknown suffix \"%s\"\n", + fname, lineno, argv[1] ); + return -1; + } + SLAP_DBFLAGS(b2) |= SLAP_DBFLAG_GLUE_SUBORDINATE; + gi = (glueinfo *)ch_realloc( gi, sizeof(glueinfo) + + gi->gi_nodes * sizeof(gluenode)); + gi->gi_n[gi->gi_nodes].gn_bx = b2 - backendDB; + dnParent( &b2->be_nsuffix[0], &gi->gi_n[gi->gi_nodes].gn_pdn ); + gi->gi_n[gi->gi_nodes].gn_async = async; + gi->gi_nodes++; + on->on_bi.bi_private = gi; + return 0; + } + return SLAP_CONF_UNKNOWN; +} + +int +glue_init() +{ + glue.on_bi.bi_type = "glue"; + + glue.on_bi.bi_db_init = glue_db_init; + glue.on_bi.bi_db_config = glue_db_config; + glue.on_bi.bi_db_open = glue_db_open; + glue.on_bi.bi_db_destroy = glue_db_destroy; + + glue.on_bi.bi_op_search = glue_op_search; + + return overlay_register( &glue ); +} + +#if SLAPD_OVER_GLUE == SLAPD_MOD_DYNAMIC +int +init_module( int argc, char *argv[] ) +{ + return glue_init(); +} +#endif /* SLAPD_OVER_GLUE == SLAPD_MOD_DYNAMIC */ + +#endif /* defined(SLAPD_OVER_GLUE */ diff --git a/servers/slapd/overlays/overlays.c b/servers/slapd/overlays/overlays.c index 76af46c103..8524c68d3e 100644 --- a/servers/slapd/overlays/overlays.c +++ b/servers/slapd/overlays/overlays.c @@ -23,6 +23,8 @@ #include "slap.h" +#define SLAPD_OVER_GLUE SLAPD_MOD_STATIC + #if SLAPD_OVER_CHAIN == SLAPD_MOD_STATIC extern int chain_init(); #endif @@ -32,6 +34,9 @@ extern int denyop_init(); #if SLAPD_OVER_DYNGROUP == SLAPD_MOD_STATIC extern int dyngroup_init(); #endif +#if SLAPD_OVER_GLUE == SLAPD_MOD_STATIC +extern int glue_init(); +#endif #if SLAPD_OVER_LASTMOD == SLAPD_MOD_STATIC extern int lastmod_init(); #endif @@ -67,6 +72,9 @@ static struct { #if SLAPD_OVER_DYNGROUP == SLAPD_MOD_STATIC { "Dynamic Group", dyngroup_init }, #endif +#if SLAPD_OVER_GLUE == SLAPD_MOD_STATIC + { "Backend Glue", glue_init }, +#endif #if SLAPD_OVER_LASTMOD == SLAPD_MOD_STATIC { "Last Modification", lastmod_init }, #endif