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/*
Unix SMB/CIFS implementation.
wins client name registration and refresh
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "nbt_server/nbt_server.h"
#include "nbt_server/wins/winsserver.h"
#include "libcli/composite/composite.h"
#include "lib/events/events.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "smbd/service_task.h"
#include "param/param.h"
static void nbtd_wins_refresh_handler(struct composite_context *c);
/* we send WINS client requests using our primary network interface
*/
static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface)
{
struct nbtd_server *nbtsrv = iface->nbtsrv;
return nbtsrv->interfaces->nbtsock;
}
static void nbtd_wins_refresh(struct event_context *ev, struct timed_event *te,
struct timeval t, void *private_data);
/*
retry a WINS name registration
*/
static void nbtd_wins_register_retry(struct event_context *ev, struct timed_event *te,
struct timeval t, void *private_data)
{
struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
nbtd_winsclient_register(iname);
}
/*
start a timer to refresh this name
*/
static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname)
{
uint32_t refresh_time;
uint32_t max_refresh_time = lp_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "max_refresh_time", 7200);
refresh_time = MIN(max_refresh_time, iname->ttl/2);
event_add_timed(iname->iface->nbtsrv->task->event_ctx,
iname,
timeval_add(&iname->registration_time, refresh_time, 0),
nbtd_wins_refresh, iname);
}
/*
called when a wins name refresh has completed
*/
static void nbtd_wins_refresh_handler(struct composite_context *c)
{
NTSTATUS status;
struct nbt_name_refresh_wins io;
struct nbtd_iface_name *iname = talloc_get_type(c->async.private_data,
struct nbtd_iface_name);
TALLOC_CTX *tmp_ctx = talloc_new(iname);
status = nbt_name_refresh_wins_recv(c, tmp_ctx, &io);
if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
/* our WINS server is dead - start registration over
from scratch */
DEBUG(2,("Failed to refresh %s with WINS server %s\n",
nbt_name_string(tmp_ctx, &iname->name), iname->wins_server));
talloc_free(tmp_ctx);
nbtd_winsclient_register(iname);
return;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1,("Name refresh failure with WINS for %s - %s\n",
nbt_name_string(tmp_ctx, &iname->name), nt_errstr(status)));
talloc_free(tmp_ctx);
return;
}
if (io.out.rcode != 0) {
DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n",
io.out.wins_server, nbt_name_string(tmp_ctx, &iname->name),
nt_errstr(nbt_rcode_to_ntstatus(io.out.rcode))));
iname->nb_flags |= NBT_NM_CONFLICT;
talloc_free(tmp_ctx);
return;
}
DEBUG(4,("Refreshed name %s with WINS server %s\n",
nbt_name_string(tmp_ctx, &iname->name), iname->wins_server));
/* success - start a periodic name refresh */
iname->nb_flags |= NBT_NM_ACTIVE;
if (iname->wins_server) {
/*
* talloc_free() would generate a warning,
* so steal it into the tmp context
*/
talloc_steal(tmp_ctx, iname->wins_server);
}
iname->wins_server = talloc_steal(iname, io.out.wins_server);
iname->registration_time = timeval_current();
nbtd_wins_start_refresh_timer(iname);
talloc_free(tmp_ctx);
}
/*
refresh a WINS name registration
*/
static void nbtd_wins_refresh(struct event_context *ev, struct timed_event *te,
struct timeval t, void *private_data)
{
struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
struct nbtd_interface *iface = iname->iface;
struct nbt_name_refresh_wins io;
struct composite_context *c;
TALLOC_CTX *tmp_ctx = talloc_new(iname);
/* setup a wins name refresh request */
io.in.name = iname->name;
io.in.wins_servers = str_list_make(tmp_ctx, iname->wins_server, NULL);
io.in.addresses = nbtd_address_list(iface, tmp_ctx);
io.in.nb_flags = iname->nb_flags;
io.in.ttl = iname->ttl;
if (!io.in.addresses) {
talloc_free(tmp_ctx);
return;
}
c = nbt_name_refresh_wins_send(wins_socket(iface), &io);
if (c == NULL) {
talloc_free(tmp_ctx);
return;
}
talloc_steal(c, io.in.addresses);
c->async.fn = nbtd_wins_refresh_handler;
c->async.private_data = iname;
talloc_free(tmp_ctx);
}
/*
called when a wins name register has completed
*/
static void nbtd_wins_register_handler(struct composite_context *c)
{
NTSTATUS status;
struct nbt_name_register_wins io;
struct nbtd_iface_name *iname = talloc_get_type(c->async.private_data,
struct nbtd_iface_name);
TALLOC_CTX *tmp_ctx = talloc_new(iname);
status = nbt_name_register_wins_recv(c, tmp_ctx, &io);
if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
/* none of the WINS servers responded - try again
periodically */
int wins_retry_time = lp_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "wins_retry", 300);
event_add_timed(iname->iface->nbtsrv->task->event_ctx,
iname,
timeval_current_ofs(wins_retry_time, 0),
nbtd_wins_register_retry,
iname);
talloc_free(tmp_ctx);
return;
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1,("Name register failure with WINS for %s - %s\n",
nbt_name_string(tmp_ctx, &iname->name), nt_errstr(status)));
talloc_free(tmp_ctx);
return;
}
if (io.out.rcode != 0) {
DEBUG(1,("WINS server %s rejected name register of %s - %s\n",
io.out.wins_server, nbt_name_string(tmp_ctx, &iname->name),
nt_errstr(nbt_rcode_to_ntstatus(io.out.rcode))));
iname->nb_flags |= NBT_NM_CONFLICT;
talloc_free(tmp_ctx);
return;
}
/* success - start a periodic name refresh */
iname->nb_flags |= NBT_NM_ACTIVE;
if (iname->wins_server) {
/*
* talloc_free() would generate a warning,
* so steal it into the tmp context
*/
talloc_steal(tmp_ctx, iname->wins_server);
}
iname->wins_server = talloc_steal(iname, io.out.wins_server);
iname->registration_time = timeval_current();
nbtd_wins_start_refresh_timer(iname);
DEBUG(3,("Registered %s with WINS server %s\n",
nbt_name_string(tmp_ctx, &iname->name), iname->wins_server));
talloc_free(tmp_ctx);
}
/*
register a name with our WINS servers
*/
void nbtd_winsclient_register(struct nbtd_iface_name *iname)
{
struct nbtd_interface *iface = iname->iface;
struct nbt_name_register_wins io;
struct composite_context *c;
/* setup a wins name register request */
io.in.name = iname->name;
io.in.wins_servers = lp_wins_server_list(iname->iface->nbtsrv->task->lp_ctx);
io.in.addresses = nbtd_address_list(iface, iname);
io.in.nb_flags = iname->nb_flags;
io.in.ttl = iname->ttl;
if (!io.in.addresses) {
return;
}
c = nbt_name_register_wins_send(wins_socket(iface), &io);
if (c == NULL) {
talloc_free(io.in.addresses);
return;
}
talloc_steal(c, io.in.addresses);
c->async.fn = nbtd_wins_register_handler;
c->async.private_data = iname;
}
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