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/*
Unix SMB/CIFS implementation.
core wins server handling
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/wins/winsdb.h"
#include "system/time.h"
#include "smbd/service_task.h"
/*
work out the ttl we will use given a client requested ttl
*/
uint32_t wins_server_ttl(struct wins_server *winssrv, uint32_t ttl)
{
ttl = MIN(ttl, winssrv->max_ttl);
ttl = MAX(ttl, winssrv->min_ttl);
return ttl;
}
static enum wrepl_name_type wrepl_type(uint16_t nb_flags, struct nbt_name *name, BOOL mhomed)
{
/* this copes with the nasty hack that is the type 0x1c name */
if (name->type == NBT_NAME_LOGON) {
return WREPL_TYPE_SGROUP;
}
if (nb_flags & NBT_NM_GROUP) {
return WREPL_TYPE_GROUP;
}
if (mhomed) {
return WREPL_TYPE_MHOMED;
}
return WREPL_TYPE_UNIQUE;
}
/*
register a new name with WINS
*/
static uint8_t wins_register_new(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct nbt_peer_socket *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
struct nbt_name *name = &packet->questions[0].name;
uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
uint16_t nb_flags = packet->additional[0].rdata.netbios.addresses[0].nb_flags;
const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
struct winsdb_record rec;
enum wrepl_name_type type;
enum wrepl_name_node node;
BOOL mhomed = ((packet->operation & NBT_OPCODE) == NBT_OPCODE_MULTI_HOME_REG);
#define WREPL_NODE_NBT_FLAGS(nb_flags) \
((nb_flags & NBT_NM_OWNER_TYPE)>>13)
type = wrepl_type(nb_flags, name, mhomed);
node = WREPL_NODE_NBT_FLAGS(nb_flags);
rec.name = name;
rec.type = type;
rec.state = WREPL_STATE_ACTIVE;
rec.node = node;
rec.is_static = False;
rec.expire_time = time(NULL) + ttl;
rec.version = 0; /* will allocated later */
rec.wins_owner = NULL; /* will be set later */
rec.registered_by = src->addr;
rec.addresses = winsdb_addr_list_make(packet);
if (rec.addresses == NULL) return NBT_RCODE_SVR;
rec.addresses = winsdb_addr_list_add(rec.addresses,
address,
WINSDB_OWNER_LOCAL,
rec.expire_time);
if (rec.addresses == NULL) return NBT_RCODE_SVR;
DEBUG(4,("WINS: accepted registration of %s with address %s\n",
nbt_name_string(packet, name), rec.addresses[0]->address));
return winsdb_add(winssrv->wins_db, &rec, WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP);
}
/*
update the ttl on an existing record
*/
static uint8_t wins_update_ttl(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct winsdb_record *rec,
const struct nbt_peer_socket *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
time_t now = time(NULL);
if (now + ttl > rec->expire_time) {
rec->expire_time = now + ttl;
}
rec->registered_by = src->addr;
DEBUG(5,("WINS: refreshed registration of %s at %s\n",
nbt_name_string(packet, rec->name), address));
return winsdb_modify(winssrv->wins_db, rec, 0);
}
/*
register a name
*/
static void nbtd_winsserver_register(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct nbt_peer_socket *src)
{
NTSTATUS status;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
struct nbt_name *name = &packet->questions[0].name;
struct winsdb_record *rec;
uint8_t rcode = NBT_RCODE_OK;
uint16_t nb_flags = packet->additional[0].rdata.netbios.addresses[0].nb_flags;
const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
/* as a special case, the local master browser name is always accepted
for registration, but never stored */
if (name->type == NBT_NAME_MASTER) {
goto done;
}
/* w2k3 refuses 0x1C names with out marked as group */
if (name->type == NBT_NAME_LOGON && !(nb_flags & NBT_NM_GROUP)) {
rcode = NBT_RCODE_RFS;
goto done;
}
status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
if (NT_STATUS_EQUAL(NT_STATUS_OBJECT_NAME_NOT_FOUND, status)) {
rcode = wins_register_new(nbtsock, packet, src);
goto done;
} else if (!NT_STATUS_IS_OK(status)) {
rcode = NBT_RCODE_SVR;
goto done;
} else if (rec->state != WREPL_STATE_ACTIVE) {
/* TODO: this is not always correct!!!*/
winsdb_delete(winssrv->wins_db, rec);
rcode = wins_register_new(nbtsock, packet, src);
goto done;
}
/* its an active name - first see if the registration is of the right type */
if ((rec->type == WREPL_TYPE_GROUP) && !(nb_flags & NBT_NM_GROUP)) {
DEBUG(2,("WINS: Attempt to register unique name %s when group name is active\n",
nbt_name_string(packet, name)));
rcode = NBT_RCODE_ACT;
goto done;
}
/* if its an active unique name, and the registration is for a group, then
see if the unique name owner still wants the name */
if (!(rec->type == WREPL_TYPE_GROUP) && (nb_flags & NBT_NM_GROUP)) {
wins_register_wack(nbtsock, packet, rec, src);
return;
}
/* if the registration is for a group, then just update the expiry time
and we are done */
if (nb_flags & NBT_NM_GROUP) {
wins_update_ttl(nbtsock, packet, rec, src);
goto done;
}
/*
* TODO: this complete functions needs a lot of work,
* to handle special group and multiomed registrations
*/
if (name->type == NBT_NAME_LOGON) {
wins_update_ttl(nbtsock, packet, rec, src);
goto done;
}
/* if the registration is for an address that is currently active, then
just update the expiry time */
if (winsdb_addr_list_check(rec->addresses, address)) {
wins_update_ttl(nbtsock, packet, rec, src);
goto done;
}
/* we have to do a WACK to see if the current owner is willing
to give up its claim */
wins_register_wack(nbtsock, packet, rec, src);
return;
done:
nbtd_name_registration_reply(nbtsock, packet, src, rcode);
}
/*
query a name
*/
static void nbtd_winsserver_query(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct nbt_peer_socket *src)
{
NTSTATUS status;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
struct nbt_name *name = &packet->questions[0].name;
struct winsdb_record *rec;
const char **addresses;
uint16_t nb_flags = 0; /* TODO: ... */
status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
if (!NT_STATUS_IS_OK(status) || rec->state != WREPL_STATE_ACTIVE) {
nbtd_negative_name_query_reply(nbtsock, packet, src);
return;
}
if (rec->type == WREPL_TYPE_GROUP) {
addresses = talloc_array(packet, const char *, 2);
if (addresses == NULL) {
nbtd_negative_name_query_reply(nbtsock, packet, src);
return;
}
addresses[0] = WINSDB_GROUP_ADDRESS;
addresses[1] = NULL;
} else {
addresses = winsdb_addr_string_list(packet, rec->addresses);
if (addresses == NULL) {
nbtd_negative_name_query_reply(nbtsock, packet, src);
return;
}
}
nbtd_name_query_reply(nbtsock, packet, src, name,
0, nb_flags, addresses);
}
/*
release a name
*/
static void nbtd_winsserver_release(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct nbt_peer_socket *src)
{
NTSTATUS status;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
struct nbt_name *name = &packet->questions[0].name;
struct winsdb_record *rec;
status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
if (!NT_STATUS_IS_OK(status) ||
rec->state != WREPL_STATE_ACTIVE ||
rec->type == WREPL_TYPE_GROUP) {
goto done;
}
/* we only allow releases from an owner - other releases are
silently ignored */
if (winsdb_addr_list_check(rec->addresses, src->addr)) {
const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
DEBUG(4,("WINS: released name %s at %s\n", nbt_name_string(rec, rec->name), address));
winsdb_addr_list_remove(rec->addresses, address);
if (rec->addresses[0] == NULL) {
rec->state = WREPL_STATE_RELEASED;
}
winsdb_modify(winssrv->wins_db, rec, 0);
}
done:
/* we match w2k3 by always giving a positive reply to name releases. */
nbtd_name_release_reply(nbtsock, packet, src, NBT_RCODE_OK);
}
/*
answer a name query
*/
void nbtd_winsserver_request(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct nbt_peer_socket *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
if ((packet->operation & NBT_FLAG_BROADCAST) || winssrv == NULL) {
return;
}
switch (packet->operation & NBT_OPCODE) {
case NBT_OPCODE_QUERY:
nbtd_winsserver_query(nbtsock, packet, src);
break;
case NBT_OPCODE_REGISTER:
case NBT_OPCODE_REFRESH:
case NBT_OPCODE_REFRESH2:
case NBT_OPCODE_MULTI_HOME_REG:
nbtd_winsserver_register(nbtsock, packet, src);
break;
case NBT_OPCODE_RELEASE:
nbtd_winsserver_release(nbtsock, packet, src);
break;
}
}
/*
startup the WINS server, if configured
*/
NTSTATUS nbtd_winsserver_init(struct nbtd_server *nbtsrv)
{
if (!lp_wins_support()) {
nbtsrv->winssrv = NULL;
return NT_STATUS_OK;
}
nbtsrv->winssrv = talloc_zero(nbtsrv, struct wins_server);
NT_STATUS_HAVE_NO_MEMORY(nbtsrv->winssrv);
nbtsrv->winssrv->max_ttl = lp_max_wins_ttl();
nbtsrv->winssrv->min_ttl = lp_min_wins_ttl();
nbtsrv->winssrv->wins_db = winsdb_connect(nbtsrv->winssrv);
if (!nbtsrv->winssrv->wins_db) {
return NT_STATUS_INTERNAL_DB_ERROR;
}
irpc_add_name(nbtsrv->task->msg_ctx, "wins_server");
return NT_STATUS_OK;
}
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