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/*
Unix SMB/CIFS implementation.
WINS database routines
Copyright (C) Andrew Tridgell 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "nbt_server/nbt_server.h"
#include "nbt_server/winsdb.h"
#include "lib/ldb/include/ldb.h"
#include "db_wrap.h"
#include "system/time.h"
/*
save the min/max version IDs for the database
*/
static BOOL winsdb_save_version(struct wins_server *winssrv)
{
int i, ret = 0;
struct ldb_context *ldb = winssrv->wins_db->ldb;
struct ldb_message *msg = ldb_msg_new(winssrv);
if (msg == NULL) goto failed;
msg->dn = talloc_strdup(msg, "CN=VERSION");
if (msg->dn == NULL) goto failed;
ret |= ldb_msg_add_fmt(ldb, msg, "minVersion", "%llu", winssrv->min_version);
ret |= ldb_msg_add_fmt(ldb, msg, "maxVersion", "%llu", winssrv->max_version);
if (ret != 0) goto failed;
for (i=0;i<msg->num_elements;i++) {
msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
}
ret = ldb_modify(ldb, msg);
if (ret != 0) ret = ldb_add(ldb, msg);
if (ret != 0) goto failed;
talloc_free(msg);
return True;
failed:
talloc_free(msg);
return False;
}
/*
allocate a new version id for a record
*/
static uint64_t winsdb_allocate_version(struct wins_server *winssrv)
{
winssrv->max_version++;
if (!winsdb_save_version(winssrv)) {
return 0;
}
return winssrv->max_version;
}
/*
allocate a new version id for a record
*/
static void winsdb_remove_version(struct wins_server *winssrv, uint64_t version)
{
if (version == winssrv->min_version) {
winssrv->min_version++;
winsdb_save_version(winssrv);
}
}
/*
load a WINS entry from the database
*/
struct winsdb_record *winsdb_load(struct wins_server *winssrv,
struct nbt_name *name, TALLOC_CTX *mem_ctx)
{
struct ldb_message **res = NULL;
int ret;
struct winsdb_record *rec;
struct ldb_message_element *el;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
const char *expr;
int i;
expr = talloc_asprintf(tmp_ctx, "dn=NAME=%s", nbt_name_string(tmp_ctx, name));
if (expr == NULL) goto failed;
/* find the record in the WINS database */
ret = ldb_search(winssrv->wins_db->ldb, NULL, LDB_SCOPE_ONELEVEL, expr, NULL, &res);
if (res != NULL) {
talloc_steal(tmp_ctx, res);
}
if (ret != 1) goto failed;
rec = talloc(tmp_ctx, struct winsdb_record);
if (rec == NULL) goto failed;
/* parse it into a more convenient winsdb_record structure */
rec->name = name;
rec->state = ldb_msg_find_int(res[0], "active", WINS_REC_RELEASED);
rec->nb_flags = ldb_msg_find_int(res[0], "nbFlags", 0);
rec->expire_time = ldap_string_to_time(ldb_msg_find_string(res[0], "expires", NULL));
rec->registered_by = ldb_msg_find_string(res[0], "registeredBy", NULL);
rec->version = ldb_msg_find_uint64(res[0], "version", 0);
talloc_steal(rec, rec->registered_by);
el = ldb_msg_find_element(res[0], "address");
if (el == NULL) goto failed;
rec->addresses = talloc_array(rec, const char *, el->num_values+1);
if (rec->addresses == NULL) goto failed;
for (i=0;i<el->num_values;i++) {
rec->addresses[i] = talloc_steal(rec->addresses, el->values[i].data);
}
rec->addresses[i] = NULL;
/* see if it has already expired */
if (rec->state == WINS_REC_ACTIVE &&
rec->expire_time <= time(NULL)) {
DEBUG(5,("WINS: expiring name %s (expired at %s)\n",
nbt_name_string(tmp_ctx, rec->name), timestring(tmp_ctx, rec->expire_time)));
rec->state = WINS_REC_RELEASED;
}
talloc_steal(mem_ctx, rec);
talloc_free(tmp_ctx);
return rec;
failed:
talloc_free(tmp_ctx);
return NULL;
}
/*
form a ldb_message from a winsdb_record
*/
static struct ldb_message *winsdb_message(struct wins_server *winssrv,
struct winsdb_record *rec, TALLOC_CTX *mem_ctx)
{
int i, ret=0;
struct ldb_context *ldb = winssrv->wins_db->ldb;
struct ldb_message *msg = ldb_msg_new(mem_ctx);
if (msg == NULL) goto failed;
msg->dn = talloc_asprintf(msg, "NAME=%s", nbt_name_string(msg, rec->name));
if (msg->dn == NULL) goto failed;
ret |= ldb_msg_add_fmt(ldb, msg, "active", "%u", rec->state);
ret |= ldb_msg_add_fmt(ldb, msg, "nbFlags", "0x%04x", rec->nb_flags);
ret |= ldb_msg_add_string(ldb, msg, "registeredBy", rec->registered_by);
ret |= ldb_msg_add_string(ldb, msg, "expires",
ldap_timestring(msg, rec->expire_time));
ret |= ldb_msg_add_fmt(ldb, msg, "version", "%llu", rec->version);
for (i=0;rec->addresses[i];i++) {
ret |= ldb_msg_add_string(ldb, msg, "address", rec->addresses[i]);
}
if (ret != 0) goto failed;
return msg;
failed:
talloc_free(msg);
return NULL;
}
/*
save a WINS record into the database
*/
uint8_t winsdb_add(struct wins_server *winssrv, struct winsdb_record *rec)
{
struct ldb_context *ldb = winssrv->wins_db->ldb;
struct ldb_message *msg;
TALLOC_CTX *tmp_ctx = talloc_new(winssrv);
int ret;
rec->version = winsdb_allocate_version(winssrv);
if (rec->version == 0) goto failed;
msg = winsdb_message(winssrv, rec, tmp_ctx);
if (msg == NULL) goto failed;
ret = ldb_add(ldb, msg);
if (ret != 0) goto failed;
talloc_free(tmp_ctx);
return NBT_RCODE_OK;
failed:
talloc_free(tmp_ctx);
return NBT_RCODE_SVR;
}
/*
modify a WINS record in the database
*/
uint8_t winsdb_modify(struct wins_server *winssrv, struct winsdb_record *rec)
{
struct ldb_context *ldb = winssrv->wins_db->ldb;
struct ldb_message *msg;
TALLOC_CTX *tmp_ctx = talloc_new(winssrv);
int ret;
int i;
rec->version = winsdb_allocate_version(winssrv);
if (rec->version == 0) goto failed;
msg = winsdb_message(winssrv, rec, tmp_ctx);
if (msg == NULL) goto failed;
for (i=0;i<msg->num_elements;i++) {
msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
}
ret = ldb_modify(ldb, msg);
if (ret != 0) goto failed;
talloc_free(tmp_ctx);
return NBT_RCODE_OK;
failed:
talloc_free(tmp_ctx);
return NBT_RCODE_SVR;
}
/*
delete a WINS record from the database
*/
uint8_t winsdb_delete(struct wins_server *winssrv, struct winsdb_record *rec)
{
struct ldb_context *ldb = winssrv->wins_db->ldb;
TALLOC_CTX *tmp_ctx = talloc_new(winssrv);
int ret;
const char *dn;
winsdb_remove_version(winssrv, rec->version);
dn = talloc_asprintf(tmp_ctx, "NAME=%s", nbt_name_string(tmp_ctx, rec->name));
if (dn == NULL) goto failed;
ret = ldb_delete(ldb, dn);
if (ret != 0) goto failed;
talloc_free(tmp_ctx);
return NBT_RCODE_OK;
failed:
talloc_free(tmp_ctx);
return NBT_RCODE_SVR;
}
/*
connect to the WINS database
*/
NTSTATUS winsdb_init(struct wins_server *winssrv)
{
winssrv->wins_db = ldb_wrap_connect(winssrv, lp_wins_url(), 0, NULL);
if (winssrv->wins_db == NULL) {
return NT_STATUS_INTERNAL_DB_ERROR;
}
return NT_STATUS_OK;
}
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