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/*
Unix SMB/CIFS implementation.
NBT datagram server
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "nbt_server/nbt_server.h"
#include "samba/service_task.h"
#include "lib/socket/socket.h"
#include "libcli/resolve/resolve.h"
#include "nbt_server/dgram/proto.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
#include "lib/util/util_str_escape.h"
#include "lib/util/util_net.h"
#include "../source3/include/fstring.h"
#include "../source3/libsmb/nmblib.h"
#include "../source3/libsmb/unexpected.h"
/*
a list of mailslots that we have static handlers for
*/
static const struct {
const char *mailslot_name;
dgram_mailslot_handler_t handler;
} mailslot_handlers[] = {
/* Handle both NTLOGON and NETLOGON in the same function, as
* they are very similar */
{ NBT_MAILSLOT_NETLOGON, nbtd_mailslot_netlogon_handler },
{ NBT_MAILSLOT_NTLOGON, nbtd_mailslot_netlogon_handler },
{ NBT_MAILSLOT_BROWSE, nbtd_mailslot_browse_handler }
};
/*
receive an incoming dgram request. This is used for general datagram
requests. Mailslot requests for our listening mailslots
are handled in the specific mailslot handlers
*/
void dgram_request_handler(struct nbt_dgram_socket *dgmsock,
struct nbt_dgram_packet *packet,
struct socket_address *src)
{
struct nbtd_interface *iface =
talloc_get_type_abort(dgmsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
const char *mailslot_name = NULL;
struct packet_struct *pstruct = NULL;
DATA_BLOB blob = { .length = 0, };
enum ndr_err_code ndr_err;
mailslot_name = dgram_mailslot_name(packet);
if (mailslot_name != NULL) {
DBG_DEBUG("Unexpected mailslot[%s] datagram request from %s:%d\n",
log_escape(packet, mailslot_name),
src->addr, src->port);
} else {
DBG_DEBUG("Unexpected general datagram request from %s:%d\n",
src->addr, src->port);
}
if (CHECK_DEBUGLVL(DBGLVL_DEBUG)) {
NDR_PRINT_DEBUG(nbt_dgram_packet, packet);
}
/*
* For now we only pass DGRAM_DIRECT_UNIQUE
* messages via nb_packet_dispatch() to
* nbtsrv->unexpected_server
*/
if (packet->msg_type != DGRAM_DIRECT_UNIQUE) {
return;
}
ndr_err = ndr_push_struct_blob(&blob, packet, packet,
(ndr_push_flags_fn_t)ndr_push_nbt_dgram_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DBG_ERR("ndr_push_nbt_dgram_packet - %s\n",
ndr_errstr(ndr_err));
return;
}
pstruct = parse_packet((char *)blob.data,
blob.length,
DGRAM_PACKET,
interpret_addr2(src->addr),
src->port);
if (pstruct != NULL) {
nb_packet_dispatch(nbtsrv->unexpected_server, pstruct);
free_packet(pstruct);
}
}
/*
setup the port 138 datagram listener for a given interface
*/
NTSTATUS nbtd_dgram_setup(struct nbtd_interface *iface, const char *bind_address)
{
struct nbt_dgram_socket *bcast_dgmsock = NULL;
struct nbtd_server *nbtsrv = iface->nbtsrv;
struct socket_address *bcast_addr, *bind_addr;
NTSTATUS status;
TALLOC_CTX *tmp_ctx = talloc_new(iface);
/* the list of mailslots that we are interested in */
size_t i;
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (strcmp("0.0.0.0", iface->netmask) != 0) {
/* listen for broadcasts on port 138 */
bcast_dgmsock = nbt_dgram_socket_init(iface, nbtsrv->task->event_ctx);
if (!bcast_dgmsock) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
bcast_addr = socket_address_from_strings(tmp_ctx, bcast_dgmsock->sock->backend_name,
iface->bcast_address,
lpcfg_dgram_port(iface->nbtsrv->task->lp_ctx));
if (!bcast_addr) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
status = socket_listen(bcast_dgmsock->sock, bcast_addr, 0, 0);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
DEBUG(0,("Failed to bind to %s:%d - %s\n",
iface->bcast_address, lpcfg_dgram_port(iface->nbtsrv->task->lp_ctx),
nt_errstr(status)));
return status;
}
dgram_set_incoming_handler(bcast_dgmsock, dgram_request_handler, iface);
}
/* listen for unicasts on port 138 */
iface->dgmsock = nbt_dgram_socket_init(iface, nbtsrv->task->event_ctx);
if (!iface->dgmsock) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
bind_addr = socket_address_from_strings(tmp_ctx, iface->dgmsock->sock->backend_name,
bind_address, lpcfg_dgram_port(iface->nbtsrv->task->lp_ctx));
if (!bind_addr) {
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
status = socket_listen(iface->dgmsock->sock, bind_addr, 0, 0);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(tmp_ctx);
DEBUG(0,("Failed to bind to %s:%d - %s\n",
bind_address, lpcfg_dgram_port(iface->nbtsrv->task->lp_ctx), nt_errstr(status)));
return status;
}
dgram_set_incoming_handler(iface->dgmsock, dgram_request_handler, iface);
talloc_free(tmp_ctx);
for (i=0;i<ARRAY_SIZE(mailslot_handlers);i++) {
/* note that we don't need to keep the pointer
to the dgmslot around - the callback is all
we need */
struct dgram_mailslot_handler *dgmslot;
if (bcast_dgmsock) {
dgmslot = dgram_mailslot_listen(bcast_dgmsock,
mailslot_handlers[i].mailslot_name,
mailslot_handlers[i].handler, iface);
NT_STATUS_HAVE_NO_MEMORY(dgmslot);
}
dgmslot = dgram_mailslot_listen(iface->dgmsock,
mailslot_handlers[i].mailslot_name,
mailslot_handlers[i].handler, iface);
NT_STATUS_HAVE_NO_MEMORY(dgmslot);
}
return NT_STATUS_OK;
}
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