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/*
Unix SMB/CIFS implementation.
NBT interface 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 "dlinklist.h"
#include "nbt_server/nbt_server.h"
#include "smbd/service_task.h"
/*
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,
const char *src_address, int src_port)
{
/* if its a WINS query then direct to our WINS server */
if ((packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
!(packet->operation & NBT_FLAG_BROADCAST)) {
nbtd_query_wins(nbtsock, packet, src_address, src_port);
return;
}
/* see if its from one of our own interfaces - if so, then ignore it */
if (nbtd_self_packet(nbtsock, packet, src_address, src_port)) {
DEBUG(10,("Ignoring self packet from %s:%d\n", src_address, src_port));
return;
}
/* the request is to us in our role as a B node */
switch (packet->operation & NBT_OPCODE) {
case NBT_OPCODE_QUERY:
nbtd_request_query(nbtsock, packet, src_address, src_port);
break;
case NBT_OPCODE_REGISTER:
case NBT_OPCODE_REFRESH:
nbtd_request_defense(nbtsock, packet, src_address, src_port);
break;
}
}
/*
find a registered name on an interface
*/
struct nbt_iface_name *nbtd_find_iname(struct nbt_interface *iface,
struct nbt_name *name,
uint16_t nb_flags)
{
struct nbt_iface_name *iname;
for (iname=iface->names;iname;iname=iname->next) {
if (iname->name.type == name->type &&
StrCaseCmp(name->name, iname->name.name) == 0 &&
((iname->nb_flags & nb_flags) == nb_flags)) {
return iname;
}
}
return NULL;
}
/*
start listening on the given address
*/
static NTSTATUS nbtd_add_socket(struct nbt_server *nbtsrv,
const char *bind_address,
const char *address,
const char *bcast,
const char *netmask)
{
struct nbt_interface *iface;
NTSTATUS status;
struct nbt_name_socket *bcast_nbtsock;
/*
we actually create two sockets. One listens on the broadcast address
for the interface, and the other listens on our specific address. This
allows us to run with "bind interfaces only" while still receiving
broadcast addresses, and also simplifies matching incoming requests
to interfaces
*/
iface = talloc(nbtsrv, struct nbt_interface);
NT_STATUS_HAVE_NO_MEMORY(iface);
iface->nbtsrv = nbtsrv;
iface->bcast_address = talloc_steal(iface, bcast);
iface->ip_address = talloc_steal(iface, address);
iface->netmask = talloc_steal(iface, netmask);
iface->names = NULL;
if (strcmp(netmask, "0.0.0.0") != 0) {
bcast_nbtsock = nbt_name_socket_init(iface, nbtsrv->task->event_ctx);
NT_STATUS_HAVE_NO_MEMORY(bcast_nbtsock);
status = socket_listen(bcast_nbtsock->sock, bcast, lp_nbt_port(), 0, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%d - %s\n",
bcast, lp_nbt_port(), nt_errstr(status)));
talloc_free(iface);
return status;
}
nbt_set_incoming_handler(bcast_nbtsock, nbtd_request_handler, iface);
}
iface->nbtsock = nbt_name_socket_init(iface, nbtsrv->task->event_ctx);
NT_STATUS_HAVE_NO_MEMORY(iface->ip_address);
status = socket_listen(iface->nbtsock->sock, bind_address, lp_nbt_port(), 0, 0);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to bind to %s:%d - %s\n",
address, lp_nbt_port(), nt_errstr(status)));
talloc_free(iface);
return status;
}
/* we need to be able to send broadcasts out */
socket_set_option(iface->nbtsock->sock, "SO_BROADCAST", "1");
nbt_set_incoming_handler(iface->nbtsock, nbtd_request_handler, iface);
if (strcmp(netmask, "0.0.0.0") == 0) {
DLIST_ADD(nbtsrv->bcast_interface, iface);
} else {
DLIST_ADD(nbtsrv->interfaces, iface);
}
return NT_STATUS_OK;
}
/*
setup our listening sockets on the configured network interfaces
*/
NTSTATUS nbtd_startup_interfaces(struct nbt_server *nbtsrv)
{
int num_interfaces = iface_count();
int i;
TALLOC_CTX *tmp_ctx = talloc_new(nbtsrv);
NTSTATUS status;
/* if we are allowing incoming packets from any address, then
we also need to bind to the wildcard address */
if (!lp_bind_interfaces_only()) {
const char *primary_address;
/* the primary address is the address we will return
for non-WINS queries not made on a specific
interface */
if (num_interfaces > 0) {
primary_address = sys_inet_ntoa(*iface_n_ip(0));
} else {
primary_address = sys_inet_ntoa(interpret_addr2(
lp_netbios_name()));
}
primary_address = talloc_strdup(tmp_ctx, primary_address);
NT_STATUS_HAVE_NO_MEMORY(primary_address);
status = nbtd_add_socket(nbtsrv,
"0.0.0.0",
primary_address,
talloc_strdup(tmp_ctx, "255.255.255.255"),
talloc_strdup(tmp_ctx, "0.0.0.0"));
NT_STATUS_NOT_OK_RETURN(status);
}
for (i=0; i<num_interfaces; i++) {
const char *address = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_ip(i)));
const char *bcast = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_bcast(i)));
const char *netmask = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_netmask(i)));
status = nbtd_add_socket(nbtsrv, address, address, bcast, netmask);
NT_STATUS_NOT_OK_RETURN(status);
}
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
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