/*
answer a name query
*/
void nbtd_request_query(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct socket_address *src)
{
struct nbtd_iface_name *iname;
struct nbt_name *name;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
/* see if its a node status query */
if (packet->qdcount == 1 &&
packet->questions[0].question_type == NBT_QTYPE_STATUS) {
nbtd_query_status(nbtsock, packet, src);
return;
}
NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
NBTD_ASSERT_PACKET(packet, src,
packet->questions[0].question_type == NBT_QTYPE_NETBIOS);
NBTD_ASSERT_PACKET(packet, src,
packet->questions[0].question_class == NBT_QCLASS_IP);
/* see if we have the requested name on this interface */
name = &packet->questions[0].name;
iname = nbtd_find_iname(iface, name, 0);
if (iname == NULL) {
/* don't send negative replies to broadcast queries */
if (packet->operation & NBT_FLAG_BROADCAST) {
return;
}
if (packet->operation & NBT_FLAG_RECURSION_DESIRED) {
nbtd_winsserver_request(nbtsock, packet, src);
return;
}
/* otherwise send a negative reply */
nbtd_negative_name_query_reply(nbtsock, packet, src);
return;
}
/*
* normally we should forward all queries with the
* recursion desired flag to the wins server, but this
* breaks are winsclient code, when doing mhomed registrations
*/
if (!(packet->operation & NBT_FLAG_BROADCAST) &&
(packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
(iname->nb_flags & NBT_NM_GROUP) &&
lpcfg_wins_support(iface->nbtsrv->task->lp_ctx)) {
nbtd_winsserver_request(nbtsock, packet, src);
return;
}
/* if the name is not yet active and its a broadcast query then
ignore it for now */
if (!(iname->nb_flags & NBT_NM_ACTIVE) &&
(packet->operation & NBT_FLAG_BROADCAST)) {
DEBUG(7,("Query for %s from %s - name not active yet on %s\n",
nbt_name_string(packet, name), src->addr, iface->ip_address));
return;
}
nbtd_name_query_reply(nbtsock, packet, src,
&iname->name, iname->ttl, iname->nb_flags,
nbtd_address_list(iface, packet));
}
/*
query a name
*/
static void nbtd_winsserver_query(struct loadparm_context *lp_ctx,
struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct socket_address *src)
{
NTSTATUS status;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
struct nbt_name *name = &packet->questions[0].name;
struct winsdb_record *rec;
struct winsdb_record *rec_1b = NULL;
const char **addresses;
const char **addresses_1b = NULL;
uint16_t nb_flags = 0;
if (name->type == NBT_NAME_MASTER) {
goto notfound;
}
/*
* w2k3 returns the first address of the 0x1B record as first address
* to a 0x1C query
*
* since Windows 2000 Service Pack 2 there's on option to trigger this behavior:
*
* HKEY_LOCAL_MACHINE\System\CurrentControlset\Services\WINS\Parameters\Prepend1BTo1CQueries
* Typ: Daten REG_DWORD
* Value: 0 = deactivated, 1 = activated
*/
if (name->type == NBT_NAME_LOGON &&
lpcfg_parm_bool(lp_ctx, NULL, "nbtd", "wins_prepend1Bto1Cqueries", true)) {
struct nbt_name name_1b;
name_1b = *name;
name_1b.type = NBT_NAME_PDC;
status = winsdb_lookup(winssrv->wins_db, &name_1b, packet, &rec_1b);
if (NT_STATUS_IS_OK(status)) {
addresses_1b = winsdb_addr_string_list(packet, rec_1b->addresses);
}
}
status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
if (!NT_STATUS_IS_OK(status)) {
if (!lpcfg_wins_dns_proxy(lp_ctx)) {
goto notfound;
}
if (name->type != NBT_NAME_CLIENT && name->type != NBT_NAME_SERVER) {
goto notfound;
}
nbtd_wins_dns_proxy_query(nbtsock, packet, src);
return;
}
/*
* for group's we always reply with
* 255.255.255.255 as address, even if
* the record is released or tombstoned
*/
if (rec->type == WREPL_TYPE_GROUP) {
addresses = str_list_add(NULL, "255.255.255.255");
talloc_steal(packet, addresses);
if (!addresses) {
goto notfound;
}
nb_flags |= NBT_NM_GROUP;
goto found;
}
if (rec->state != WREPL_STATE_ACTIVE) {
goto notfound;
}
addresses = winsdb_addr_string_list(packet, rec->addresses);
if (!addresses) {
goto notfound;
}
/*
* if addresses_1b isn't NULL, we have a 0x1C query and need to return the
* first 0x1B address as first address
*/
if (addresses_1b && addresses_1b[0]) {
const char **addresses_1c = addresses;
uint32_t i;
uint32_t num_addrs;
addresses = str_list_add(NULL, addresses_1b[0]);
if (!addresses) {
goto notfound;
}
talloc_steal(packet, addresses);
num_addrs = 1;
for (i=0; addresses_1c[i]; i++) {
if (strcmp(addresses_1b[0], addresses_1c[i]) == 0) continue;
/*
* stop when we already have 25 addresses
*/
if (num_addrs >= 25) break;
num_addrs++;
addresses = str_list_add(addresses, addresses_1c[i]);
if (!addresses) {
goto notfound;
}
}
}
if (rec->type == WREPL_TYPE_SGROUP) {
nb_flags |= NBT_NM_GROUP;
} else {
nb_flags |= (rec->node <<13);
}
/*
* since Windows 2000 Service Pack 2 there's on option to trigger this behavior:
*
* HKEY_LOCAL_MACHINE\System\CurrentControlset\Services\WINS\Parameters\Randomize1CList
* Typ: Daten REG_DWORD
* Value: 0 = deactivated, 1 = activated
*/
if (name->type == NBT_NAME_LOGON &&
lpcfg_parm_bool(lp_ctx, NULL, "nbtd", "wins_randomize1Clist", false)) {
nbtd_wins_randomize1Clist(lp_ctx, addresses, src);
}
found:
nbtd_name_query_reply(nbtsock, packet, src, name,
0, nb_flags, addresses);
return;
notfound:
nbtd_negative_name_query_reply(nbtsock, packet, src);
}
