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samba-mirror/source4/wrepl_server/wrepl_server.c
2007-10-10 13:44:46 -05:00

398 lines
9.9 KiB
C

/*
Unix SMB/CIFS implementation.
WINS Replication server
Copyright (C) Stefan Metzmacher 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 "dlinklist.h"
#include "lib/events/events.h"
#include "lib/socket/socket.h"
#include "smbd/service_task.h"
#include "smbd/service_stream.h"
#include "lib/messaging/irpc.h"
#include "librpc/gen_ndr/ndr_winsrepl.h"
#include "wrepl_server/wrepl_server.h"
#include "nbt_server/wins/winsdb.h"
#include "ldb/include/ldb.h"
/*
open winsdb
*/
static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service)
{
service->wins_db = winsdb_connect(service);
if (!service->wins_db) {
return NT_STATUS_INTERNAL_DB_ERROR;
}
return NT_STATUS_OK;
}
struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
{
struct wreplsrv_partner *cur;
for (cur = service->partners; cur; cur = cur->next) {
if (strcmp(cur->address, peer_addr) == 0) {
return cur;
}
}
return NULL;
}
/*
load our replication partners
*/
static NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
{
struct ldb_message **res = NULL;
int ret;
TALLOC_CTX *tmp_ctx = talloc_new(service);
int i;
/* find the record in the WINS database */
ret = ldb_search(service->wins_db, ldb_dn_explode(tmp_ctx, "CN=PARTNERS"), LDB_SCOPE_ONELEVEL,
"(objectClass=wreplPartner)", NULL, &res);
if (res != NULL) {
talloc_steal(tmp_ctx, res);
}
if (ret < 0) goto failed;
if (ret == 0) goto done;
for (i=0; i < ret; i++) {
struct wreplsrv_partner *partner;
partner = talloc_zero(service, struct wreplsrv_partner);
if (partner == NULL) goto failed;
partner->service = service;
partner->address = ldb_msg_find_string(res[i], "address", NULL);
if (!partner->address) goto failed;
partner->name = ldb_msg_find_string(res[i], "name", partner->address);
partner->type = ldb_msg_find_int(res[i], "type", WINSREPL_PARTNER_BOTH);
partner->pull.interval = ldb_msg_find_int(res[i], "pullInterval", WINSREPL_DEFAULT_PULL_INTERVAL);
partner->pull.retry_interval = ldb_msg_find_int(res[i], "pullRetryInterval",
WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
partner->our_address = ldb_msg_find_string(res[i], "ourAddress", NULL);
talloc_steal(partner, partner->address);
talloc_steal(partner, partner->name);
talloc_steal(partner, partner->our_address);
DLIST_ADD(service->partners, partner);
}
done:
talloc_free(tmp_ctx);
return NT_STATUS_OK;
failed:
talloc_free(tmp_ctx);
return NT_STATUS_FOOBAR;
}
BOOL wreplsrv_is_our_address(struct wreplsrv_service *service, const char *address)
{
const char *our_address;
if (lp_interfaces() && lp_bind_interfaces_only()) {
int num_interfaces = iface_count();
int i;
for(i = 0; i < num_interfaces; i++) {
our_address = iface_n_ip(i);
if (strcasecmp(our_address, address) == 0) {
return True;
}
}
} else {
our_address = lp_socket_address();
if (strcasecmp(our_address, address) == 0) {
return True;
}
}
return False;
}
uint64_t wreplsrv_local_max_version(struct wreplsrv_service *service)
{
int ret;
struct ldb_context *ldb = service->wins_db;
struct ldb_dn *dn;
struct ldb_message **res = NULL;
TALLOC_CTX *tmp_ctx = talloc_new(service);
uint64_t maxVersion = 0;
dn = ldb_dn_explode(tmp_ctx, "CN=VERSION");
if (!dn) goto failed;
/* find the record in the WINS database */
ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
NULL, NULL, &res);
if (res != NULL) {
talloc_steal(tmp_ctx, res);
}
if (ret < 0) goto failed;
if (ret > 1) goto failed;
if (ret == 1) {
maxVersion = ldb_msg_find_uint64(res[0], "maxVersion", 0);
}
failed:
talloc_free(tmp_ctx);
return maxVersion;
}
NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
TALLOC_CTX *mem_ctx,
struct wrepl_table *table_out,
const char *our_ip,
const char *initiator,
BOOL full_table)
{
struct wreplsrv_owner *cur;
uint64_t local_max_version;
uint32_t i = 0;
table_out->partner_count = 0;
table_out->partners = NULL;
table_out->initiator = initiator;
local_max_version = wreplsrv_local_max_version(service);
if (local_max_version > 0) {
table_out->partner_count++;
}
for (cur = service->table; full_table && cur; cur = cur->next) {
table_out->partner_count++;
}
table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
if (local_max_version > 0) {
table_out->partners[i].address = our_ip;
table_out->partners[i].min_version = 0;
table_out->partners[i].max_version = local_max_version;
table_out->partners[i].type = 1;
i++;
}
for (cur = service->table; full_table && cur; cur = cur->next) {
table_out->partners[i] = cur->owner;
i++;
}
return NT_STATUS_OK;
}
struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_owner *table, const char *wins_owner)
{
struct wreplsrv_owner *cur;
for (cur = table; cur; cur = cur->next) {
if (strcmp(cur->owner.address, wins_owner) == 0) {
return cur;
}
}
return NULL;
}
/*
update the wins_owner_table max_version, if the given version is the highest version
if no entry for the wins_owner exists yet, create one
*/
NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
const char *wins_owner, uint64_t version)
{
struct wreplsrv_owner *table = *_table;
struct wreplsrv_owner *cur;
if (strcmp(WINSDB_OWNER_LOCAL, wins_owner) == 0) {
return NT_STATUS_OK;
}
cur = wreplsrv_find_owner(table, wins_owner);
/* if it doesn't exists yet, create one */
if (!cur) {
cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
NT_STATUS_HAVE_NO_MEMORY(cur);
cur->owner.address = talloc_strdup(cur, wins_owner);
NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
cur->owner.min_version = 0;
cur->owner.max_version = 0;
cur->owner.type = 1; /* don't know why this is always 1 */
cur->partner = wreplsrv_find_partner(service, wins_owner);
DLIST_ADD(table, cur);
*_table = table;
}
/* the min_version is always 0 here, and won't be updated */
/* if the given version is higher the then current nax_version, update */
if (cur->owner.max_version < version) {
cur->owner.max_version = version;
}
return NT_STATUS_OK;
}
/*
load the partner table
*/
static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
{
struct ldb_message **res = NULL;
int ret;
NTSTATUS status;
TALLOC_CTX *tmp_ctx = talloc_new(service);
int i;
const char *wins_owner;
uint64_t version;
const char * const attrs[] = {
"winsOwner",
"versionID",
NULL
};
/* find the record in the WINS database */
ret = ldb_search(service->wins_db, NULL, LDB_SCOPE_SUBTREE,
"(objectClass=winsRecord)", attrs, &res);
if (res != NULL) {
talloc_steal(tmp_ctx, res);
}
status = NT_STATUS_INTERNAL_DB_CORRUPTION;
if (ret < 0) goto failed;
if (ret == 0) goto done;
for (i=0; i < ret; i++) {
wins_owner = ldb_msg_find_string(res[i], "winsOwner", NULL);
version = ldb_msg_find_uint64(res[i], "versionID", 0);
if (wins_owner) {
status = wreplsrv_add_table(service,
service, &service->table,
wins_owner, version);
if (!NT_STATUS_IS_OK(status)) goto failed;
}
talloc_free(res[i]);
/* TODO: what's abut the per address owners? */
}
done:
talloc_free(tmp_ctx);
return NT_STATUS_OK;
failed:
talloc_free(tmp_ctx);
return status;
}
/*
setup our replication partners
*/
static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
{
NTSTATUS status;
status = wreplsrv_load_partners(service);
NT_STATUS_NOT_OK_RETURN(status);
status = wreplsrv_load_table(service);
NT_STATUS_NOT_OK_RETURN(status);
status = wreplsrv_setup_out_connections(service);
NT_STATUS_NOT_OK_RETURN(status);
return NT_STATUS_OK;
}
/*
startup the wrepl task
*/
static void wreplsrv_task_init(struct task_server *task)
{
NTSTATUS status;
struct wreplsrv_service *service;
service = talloc_zero(task, struct wreplsrv_service);
if (!service) {
task_server_terminate(task, "wreplsrv_task_init: out of memory");
return;
}
service->task = task;
task->private = service;
/*
* setup up all partners, and open the winsdb
*/
status = wreplsrv_open_winsdb(service);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
return;
}
/*
* setup timed events for each partner we want to pull from
*/
status = wreplsrv_setup_partners(service);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
return;
}
/*
* setup listen sockets, so we can anwser requests from our partners,
* which pull from us
*/
status = wreplsrv_setup_sockets(service);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
return;
}
irpc_add_name(task->msg_ctx, "wrepl_server");
}
/*
initialise the WREPL server
*/
static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
{
if (!lp_wins_support()) {
return NT_STATUS_OK;
}
return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
}
/*
register ourselves as a available server
*/
NTSTATUS server_service_wrepl_init(void)
{
return register_server_service("wrepl", wreplsrv_init);
}