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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/winsdb.h"
#include "system/time.h"
/*
register a new name with WINS
*/
static uint8_t wins_register_new(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const char *src_address, int src_port)
{
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 = packet->additional[0].ttl;
struct winsdb_record rec;
ttl = MIN(ttl, winssrv->max_ttl);
ttl = MAX(ttl, winssrv->min_ttl);
rec.name = name;
rec.nb_flags = packet->additional[0].rdata.netbios.addresses[0].nb_flags;
rec.state = WINS_REC_ACTIVE;
rec.expire_time = time(NULL) + ttl;
rec.registered_by = src_address;
rec.addresses = str_list_make(packet,
packet->additional[0].rdata.netbios.addresses[0].ipaddr,
NULL);
return winsdb_add(winssrv, &rec);
}
/*
register a name
*/
static void nbtd_winsserver_register(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const char *src_address, int src_port)
{
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 = 0;
rec = winsdb_load(winssrv, name, packet);
if (rec == NULL) {
rcode = wins_register_new(nbtsock, packet, src_address, src_port);
} else if (rec->state != WINS_REC_ACTIVE) {
uint32_t ttl = packet->additional[0].ttl;
ttl = MIN(ttl, winssrv->max_ttl);
ttl = MAX(ttl, winssrv->min_ttl);
rec->nb_flags = packet->additional[0].rdata.netbios.addresses[0].nb_flags;
rec->state = WINS_REC_ACTIVE;
rec->expire_time = time(NULL) + ttl;
rec->registered_by = src_address;
rec->addresses = str_list_make(packet,
packet->additional[0].rdata.netbios.addresses[0].ipaddr,
NULL);
winsdb_modify(winssrv, rec);
} else {
rcode = NBT_RCODE_ACT;
}
nbtd_name_registration_reply(nbtsock, packet, src_address, src_port, rcode);
}
/*
query a name
*/
static void nbtd_winsserver_query(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const char *src_address, int src_port)
{
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;
rec = winsdb_load(winssrv, name, packet);
if (rec == NULL || rec->state != WINS_REC_ACTIVE) {
nbtd_negative_name_query_reply(nbtsock, packet, src_address, src_port);
return;
}
nbtd_name_query_reply(nbtsock, packet, src_address, src_port, name,
0, rec->nb_flags, rec->addresses);
}
/*
release a name
*/
static void nbtd_winsserver_release(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const char *src_address, int src_port)
{
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;
rec = winsdb_load(winssrv, name, packet);
if (rec != NULL && rec->state == WINS_REC_ACTIVE) {
rec->state = WINS_REC_RELEASED;
winsdb_modify(winssrv, rec);
}
/* we match w2k3 by always giving a positive reply to name releases. */
nbtd_name_release_reply(nbtsock, packet, src_address, src_port, NBT_RCODE_OK);
}
/*
answer a name query
*/
void nbtd_winsserver_request(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const char *src_address, int src_port)
{
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_address, src_port);
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_address, src_port);
break;
case NBT_OPCODE_RELEASE:
nbtd_winsserver_release(nbtsock, packet, src_address, src_port);
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(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();
return winsdb_init(nbtsrv->winssrv);
}
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