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https://github.com/samba-team/samba.git
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c3c19615c1
(This used to be commit 88d82d0623
)
330 lines
8.1 KiB
C
330 lines
8.1 KiB
C
/*
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Unix SMB/CIFS implementation.
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Database interface wrapper around tdb
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Copyright (C) Volker Lendecke 2005-2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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struct db_tdb_ctx {
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struct tdb_wrap *wtdb;
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};
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static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag);
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static NTSTATUS db_tdb_delete(struct db_record *rec);
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static int db_tdb_record_destr(struct db_record* data)
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{
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struct db_tdb_ctx *ctx =
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talloc_get_type_abort(data->private_data, struct db_tdb_ctx);
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DEBUG(10, (DEBUGLEVEL > 10
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? "Unlocking key %s\n" : "Unlocking key %.20s\n",
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hex_encode(data, (unsigned char *)data->key.dptr,
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data->key.dsize)));
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if (tdb_chainunlock(ctx->wtdb->tdb, data->key) != 0) {
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DEBUG(0, ("tdb_chainunlock failed\n"));
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return -1;
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}
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return 0;
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}
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struct tdb_fetch_locked_state {
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TALLOC_CTX *mem_ctx;
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struct db_record *result;
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};
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static int db_tdb_fetchlock_parse(TDB_DATA key, TDB_DATA data,
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void *private_data)
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{
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struct tdb_fetch_locked_state *state =
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(struct tdb_fetch_locked_state *)private_data;
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state->result = (struct db_record *)talloc_size(
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state->mem_ctx,
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sizeof(struct db_record) + key.dsize + data.dsize);
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if (state->result == NULL) {
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return 0;
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}
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state->result->key.dsize = key.dsize;
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state->result->key.dptr = ((uint8 *)state->result)
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+ sizeof(struct db_record);
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memcpy(state->result->key.dptr, key.dptr, key.dsize);
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state->result->value.dsize = data.dsize;
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if (data.dsize > 0) {
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state->result->value.dptr = state->result->key.dptr+key.dsize;
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memcpy(state->result->value.dptr, data.dptr, data.dsize);
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}
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else {
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state->result->value.dptr = NULL;
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}
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return 0;
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}
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static struct db_record *db_tdb_fetch_locked(struct db_context *db,
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TALLOC_CTX *mem_ctx, TDB_DATA key)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(db->private_data,
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struct db_tdb_ctx);
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struct tdb_fetch_locked_state state;
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int res;
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if (DEBUGLEVEL >= 10) {
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char *keystr = hex_encode(NULL, key.dptr, key.dsize);
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DEBUG(10, (DEBUGLEVEL > 10
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? "Locking key %s\n" : "Locking key %.20s\n",
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keystr));
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TALLOC_FREE(keystr);
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}
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if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
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DEBUG(3, ("tdb_chainlock failed\n"));
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return NULL;
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}
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state.mem_ctx = mem_ctx;
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state.result = NULL;
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res = tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_fetchlock_parse,
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&state);
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if (state.result == NULL) {
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db_tdb_fetchlock_parse(key, tdb_null, &state);
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}
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if (state.result == NULL) {
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tdb_chainunlock(ctx->wtdb->tdb, key);
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return NULL;
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}
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talloc_set_destructor(state.result, db_tdb_record_destr);
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state.result->private_data = talloc_reference(state.result, ctx);
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state.result->store = db_tdb_store;
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state.result->delete_rec = db_tdb_delete;
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DEBUG(10, ("Allocated locked data 0x%p\n", state.result));
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return state.result;
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}
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struct tdb_fetch_state {
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TALLOC_CTX *mem_ctx;
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int result;
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TDB_DATA data;
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};
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static int db_tdb_fetch_parse(TDB_DATA key, TDB_DATA data,
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void *private_data)
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{
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struct tdb_fetch_state *state =
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(struct tdb_fetch_state *)private_data;
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state->data.dptr = (uint8 *)talloc_memdup(state->mem_ctx, data.dptr,
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data.dsize);
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if (state->data.dptr == NULL) {
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state->result = -1;
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return 0;
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}
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state->data.dsize = data.dsize;
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return 0;
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}
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static int db_tdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
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TDB_DATA key, TDB_DATA *pdata)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_tdb_ctx);
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struct tdb_fetch_state state;
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state.mem_ctx = mem_ctx;
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state.result = 0;
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state.data.dptr = NULL;
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state.data.dsize = 0;
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tdb_parse_record(ctx->wtdb->tdb, key, db_tdb_fetch_parse, &state);
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if (state.result == -1) {
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return -1;
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}
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*pdata = state.data;
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return 0;
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}
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static NTSTATUS db_tdb_store(struct db_record *rec, TDB_DATA data, int flag)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
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struct db_tdb_ctx);
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/*
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* This has a bug: We need to replace rec->value for correct
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* operation, but right now brlock and locking don't use the value
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* anymore after it was stored.
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*/
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return (tdb_store(ctx->wtdb->tdb, rec->key, data, flag) == 0) ?
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NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
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}
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static NTSTATUS db_tdb_delete(struct db_record *rec)
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{
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struct db_tdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
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struct db_tdb_ctx);
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int res;
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res = tdb_delete(ctx->wtdb->tdb, rec->key);
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if (res == 0) {
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return NT_STATUS_OK;
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}
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return map_nt_error_from_tdb(tdb_error(ctx->wtdb->tdb));
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}
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struct db_tdb_traverse_ctx {
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struct db_context *db;
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int (*f)(struct db_record *rec, void *private_data);
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void *private_data;
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};
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static int db_tdb_traverse_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
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void *private_data)
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{
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struct db_tdb_traverse_ctx *ctx =
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(struct db_tdb_traverse_ctx *)private_data;
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struct db_record rec;
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rec.key = kbuf;
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rec.value = dbuf;
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rec.store = db_tdb_store;
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rec.delete_rec = db_tdb_delete;
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rec.private_data = ctx->db->private_data;
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return ctx->f(&rec, ctx->private_data);
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}
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static int db_tdb_traverse(struct db_context *db,
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int (*f)(struct db_record *rec, void *private_data),
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void *private_data)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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struct db_tdb_traverse_ctx ctx;
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ctx.db = db;
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ctx.f = f;
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ctx.private_data = private_data;
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return tdb_traverse(db_ctx->wtdb->tdb, db_tdb_traverse_func, &ctx);
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}
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static NTSTATUS db_tdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
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{
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return NT_STATUS_MEDIA_WRITE_PROTECTED;
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}
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static NTSTATUS db_tdb_delete_deny(struct db_record *rec)
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{
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return NT_STATUS_MEDIA_WRITE_PROTECTED;
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}
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static int db_tdb_traverse_read_func(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
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void *private_data)
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{
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struct db_tdb_traverse_ctx *ctx =
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(struct db_tdb_traverse_ctx *)private_data;
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struct db_record rec;
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rec.key = kbuf;
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rec.value = dbuf;
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rec.store = db_tdb_store_deny;
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rec.delete_rec = db_tdb_delete_deny;
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rec.private_data = ctx->db->private_data;
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return ctx->f(&rec, ctx->private_data);
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}
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static int db_tdb_traverse_read(struct db_context *db,
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int (*f)(struct db_record *rec, void *private_data),
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void *private_data)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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struct db_tdb_traverse_ctx ctx;
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ctx.db = db;
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ctx.f = f;
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ctx.private_data = private_data;
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return tdb_traverse_read(db_ctx->wtdb->tdb, db_tdb_traverse_read_func, &ctx);
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}
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static int db_tdb_get_seqnum(struct db_context *db)
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{
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struct db_tdb_ctx *db_ctx =
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talloc_get_type_abort(db->private_data, struct db_tdb_ctx);
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return tdb_get_seqnum(db_ctx->wtdb->tdb);
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}
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struct db_context *db_open_tdb(TALLOC_CTX *mem_ctx,
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const char *name,
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int hash_size, int tdb_flags,
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int open_flags, mode_t mode)
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{
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struct db_context *result = NULL;
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struct db_tdb_ctx *db_tdb;
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result = TALLOC_ZERO_P(mem_ctx, struct db_context);
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if (result == NULL) {
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DEBUG(0, ("talloc failed\n"));
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goto fail;
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}
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result->private_data = db_tdb = TALLOC_P(result, struct db_tdb_ctx);
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if (db_tdb == NULL) {
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DEBUG(0, ("talloc failed\n"));
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goto fail;
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}
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db_tdb->wtdb = tdb_wrap_open(db_tdb, name, hash_size, tdb_flags,
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open_flags, mode);
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if (db_tdb->wtdb == NULL) {
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DEBUG(3, ("Could not open tdb: %s\n", strerror(errno)));
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goto fail;
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}
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result->fetch_locked = db_tdb_fetch_locked;
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result->fetch = db_tdb_fetch;
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result->traverse = db_tdb_traverse;
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result->traverse_read = db_tdb_traverse_read;
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result->get_seqnum = db_tdb_get_seqnum;
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return result;
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fail:
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if (result != NULL) {
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TALLOC_FREE(result);
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}
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return NULL;
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}
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