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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"
/*
find a registered name on an interface
*/
struct nbt_iface_name *nbt_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;
}
/*
see if a src address matches an interface
*/
static BOOL nbt_iface_match(struct nbt_interface *iface, const char *src_address)
{
struct ipv4_addr ip1, ip2, mask;
ip1 = interpret_addr2(iface->ip_address);
ip2 = interpret_addr2(src_address);
mask = interpret_addr2(iface->netmask);
return same_net(ip1, ip2, mask);
}
/*
find the appropriate interface for a incoming packet. If a local interface isn't
found then the general broadcast interface is used
*/
struct nbt_interface *nbt_iface_find(struct nbt_name_socket *nbtsock, const char *src_address)
{
struct nbt_interface *iface = talloc_get_type(nbtsock->incoming.private, struct nbt_interface);
struct nbt_server *nbtsrv = iface->nbtsrv;
/* it might have been received by one of our specific bound
addresses */
if (iface != nbtsrv->bcast_interface) {
return iface;
}
/* it came in on our broadcast interface - try to find a match */
for (iface=nbtsrv->interfaces;iface;iface=iface->next) {
if (nbt_iface_match(iface, src_address)) {
return iface;
}
}
/* it didn't match any specific interface - use our general broadcast interface */
return nbtsrv->bcast_interface;
}
/*
start listening on the given address
*/
static NTSTATUS nbt_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;
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;
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;
}
socket_set_option(iface->nbtsock->sock, "SO_BROADCAST", "1");
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 nbt_startup_interfaces(struct nbt_server *nbtsrv)
{
int num_interfaces = iface_count();
int i;
TALLOC_CTX *tmp_ctx = talloc_new(nbtsrv);
NTSTATUS status;
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 = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_ip(0)));
} else {
primary_address = sys_inet_ntoa(interpret_addr2(lp_netbios_name()));
}
status = nbt_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 = nbt_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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