/*
receive an incoming request and dispatch it to the right place
*/
static void nbtd_request_handler(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct socket_address *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
nbtsrv->stats.total_received++;
/* see if its from one of our own interfaces - if so, then ignore it */
if (nbtd_self_packet_and_bcast(nbtsock, packet, src)) {
DEBUG(10,("Ignoring bcast self packet from %s:%d\n", src->addr, src->port));
return;
}
switch (packet->operation & NBT_OPCODE) {
case NBT_OPCODE_QUERY:
nbtsrv->stats.query_count++;
nbtd_request_query(nbtsock, packet, src);
break;
case NBT_OPCODE_REGISTER:
case NBT_OPCODE_REFRESH:
case NBT_OPCODE_REFRESH2:
nbtsrv->stats.register_count++;
nbtd_request_defense(nbtsock, packet, src);
break;
case NBT_OPCODE_RELEASE:
case NBT_OPCODE_MULTI_HOME_REG:
nbtsrv->stats.release_count++;
nbtd_winsserver_request(nbtsock, packet, src);
break;
default:
nbtd_bad_packet(packet, src, "Unexpected opcode");
break;
}
}
/*
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));
}
