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/*
Unix SMB/CIFS implementation.
answer node status queries
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 "../lib/util/dlinklist.h"
#include "system/network.h"
#include "nbt_server/nbt_server.h"
#include "lib/socket/socket.h"
#include "librpc/gen_ndr/ndr_nbt.h"
/*
send a name status reply
*/
static void nbtd_node_status_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
struct socket_address *src,
struct nbt_name *name,
struct nbtd_interface *iface)
{
struct nbt_name_packet *packet;
uint32_t name_count;
struct nbtd_iface_name *iname;
struct nbtd_server *nbtsrv = iface->nbtsrv;
/* work out how many names to send */
name_count = 0;
for (iname=iface->names;iname;iname=iname->next) {
if ((iname->nb_flags & NBT_NM_ACTIVE) &&
strcmp(iname->name.name, "*") != 0) {
name_count++;
}
}
packet = talloc_zero(nbtsock, struct nbt_name_packet);
if (packet == NULL) return;
packet->name_trn_id = request_packet->name_trn_id;
packet->ancount = 1;
packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE;
packet->answers = talloc_array(packet, struct nbt_res_rec, 1);
if (packet->answers == NULL) goto failed;
packet->answers[0].name = *name;
packet->answers[0].rr_type = NBT_QTYPE_STATUS;
packet->answers[0].rr_class = NBT_QCLASS_IP;
packet->answers[0].ttl = 0;
packet->answers[0].rdata.status.num_names = name_count;
packet->answers[0].rdata.status.names = talloc_array(packet->answers,
struct nbt_status_name, name_count);
if (packet->answers[0].rdata.status.names == NULL) goto failed;
name_count = 0;
for (iname=iface->names;iname;iname=iname->next) {
if ((iname->nb_flags & NBT_NM_ACTIVE) &&
strcmp(iname->name.name, "*") != 0) {
struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count];
n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name);
if (n->name == NULL) goto failed;
n->type = iname->name.type;
n->nb_flags = iname->nb_flags;
name_count++;
}
}
/* we deliberately don't fill in the statistics structure as
it could lead to giving attackers too much information */
ZERO_STRUCT(packet->answers[0].rdata.status.statistics);
DEBUG(7,("Sending node status reply for %s to %s:%d\n",
nbt_name_string(packet, name), src->addr, src->port));
nbtsrv->stats.total_sent++;
nbt_name_reply_send(nbtsock, src, packet);
failed:
talloc_free(packet);
}
/*
answer a node status query
*/
void nbtd_query_status(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct socket_address *src)
{
struct nbt_name *name;
struct nbtd_iface_name *iname;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1);
NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_type == NBT_QTYPE_STATUS);
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, NBT_NM_ACTIVE);
if (iname == NULL) {
DEBUG(7,("Node status query for %s from %s - not found on %s\n",
nbt_name_string(packet, name), src->addr, iface->ip_address));
return;
}
nbtd_node_status_reply(nbtsock, packet, src,
&iname->name, iface);
}
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