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nbt_server: redirect incoming response packets to the correct interface

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We may send requests packets (WACK challenges or similar things)
via a different udp socket than the socket we receive the
matching response. We need to setup an unexpected handler
on the nbt sockets and redirect responses to the correct
nbt_socket. (By redirect I mean we use the correct
nbt_socket structure, we're *not* resending the packet
with sendto() via the kernel...)

metze
(from samba4wins tree 7ce8e705e5a9aabb787d17fbec7a078d9d6780dc)
This commit is contained in:
Stefan Metzmacher
2008-01-16 13:57:50 +01:00
committed by Stefan Metzmacher
parent ebab6d6ce4
commit a5b3975cf7
1 changed files with 53 additions and 0 deletions
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53
source4/nbt_server/interfaces.c
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@ -75,6 +75,58 @@ static void nbtd_request_handler(struct nbt_name_socket *nbtsock,
}
}
static void nbtd_unexpected_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;
struct nbtd_interface *i;
struct nbt_name_request *req = NULL;
nbtsrv->stats.total_received++;
DEBUG(10,("unexpected from src[%s] on interface[%p] %s/%s\n",
src->addr, iface, iface->ip_address, iface->netmask));
/* try the broadcast interface */
if (nbtsrv->bcast_interface) {
i = nbtsrv->bcast_interface;
req = idr_find(i->nbtsock->idr, packet->name_trn_id);
}
/* try the wins server client interface */
if (!req && nbtsrv->wins_interface) {
i = nbtsrv->wins_interface;
req = idr_find(i->nbtsock->idr, packet->name_trn_id);
}
/* try all other interfaces... */
if (!req) {
for (i = nbtsrv->interfaces; i; i = i->next) {
if (i == iface) {
continue;
}
req = idr_find(i->nbtsock->idr, packet->name_trn_id);
if (req) break;
}
}
if (!req) {
DEBUG(10,("unexpected from src[%s] unable to redirected\n", src->addr));
return;
}
DEBUG(10,("unexpected from src[%s] redirected to interface[%p] %s/%s\n",
src->addr, i, i->ip_address, i->netmask));
/*
* redirect the incoming response to the socket
* we sent the matching request
*/
nbt_name_socket_handle_response_packet(req, packet, src);
}
/*
find a registered name on an interface
@ -180,6 +232,7 @@ static NTSTATUS nbtd_add_socket(struct nbtd_server *nbtsrv,
talloc_free(unicast_address);
nbt_set_incoming_handler(iface->nbtsock, nbtd_request_handler, iface);
nbt_set_unexpected_handler(iface->nbtsock, nbtd_unexpected_handler, iface);
/* also setup the datagram listeners */
status = nbtd_dgram_setup(iface, bind_address);