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/*
Unix SMB/CIFS implementation.
packet utility functions
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 "smbd/service_task.h"
#include "lib/socket/socket.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
/*
we received a badly formed packet - log it
*/
void nbtd_bad_packet(struct nbt_name_packet *packet,
const struct socket_address *src, const char *reason)
{
DEBUG(2,("nbtd: bad packet '%s' from %s:%d\n", reason, src->addr, src->port));
if (DEBUGLVL(5)) {
NDR_PRINT_DEBUG(nbt_name_packet, packet);
}
}
/*
see if an incoming packet is a broadcast packet from one of our own
interfaces
*/
bool nbtd_self_packet_and_bcast(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct socket_address *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
/* if its not a broadcast then its not considered a self packet */
if (!(packet->operation & NBT_FLAG_BROADCAST)) {
return false;
}
/*
* this uses the fact that iface->nbtsock is the unicast listen address
* if the interface isn't the global bcast interface
*
* so if the request was directed to the unicast address it isn't a broadcast
* message
*/
if (iface->nbtsock == nbtsock &&
iface != iface->nbtsrv->bcast_interface) {
return false;
}
return nbtd_self_packet(nbtsock, packet, src);
}
bool nbtd_self_packet(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const struct socket_address *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
/* if its not from the nbt port, then it wasn't a broadcast from us */
if (src->port != lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx)) {
return false;
}
/* we have to loop over our interface list, seeing if its from
one of our own interfaces */
for (iface=nbtsrv->interfaces;iface;iface=iface->next) {
if (strcmp(src->addr, iface->ip_address) == 0) {
return true;
}
}
return false;
}
/*
send a name query reply
*/
void nbtd_name_query_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
struct socket_address *src,
struct nbt_name *name, uint32_t ttl,
uint16_t nb_flags, const char **addresses)
{
struct nbt_name_packet *packet;
size_t num_addresses = str_list_length(addresses);
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
int i;
if (num_addresses == 0) {
DEBUG(3,("No addresses in name query reply - failing\n"));
return;
}
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_FLAG_REPLY |
NBT_OPCODE_QUERY |
NBT_FLAG_AUTHORITATIVE |
NBT_FLAG_RECURSION_DESIRED |
NBT_FLAG_RECURSION_AVAIL;
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_NETBIOS;
packet->answers[0].rr_class = NBT_QCLASS_IP;
packet->answers[0].ttl = ttl;
packet->answers[0].rdata.netbios.length = num_addresses*6;
packet->answers[0].rdata.netbios.addresses =
talloc_array(packet->answers, struct nbt_rdata_address, num_addresses);
if (packet->answers[0].rdata.netbios.addresses == NULL) goto failed;
for (i=0;i<num_addresses;i++) {
struct nbt_rdata_address *addr =
&packet->answers[0].rdata.netbios.addresses[i];
addr->nb_flags = nb_flags;
addr->ipaddr = talloc_strdup(packet->answers, addresses[i]);
if (addr->ipaddr == NULL) goto failed;
}
DEBUG(7,("Sending name query reply for %s at %s to %s:%d\n",
nbt_name_string(packet, name), addresses[0], src->addr, src->port));
nbtsrv->stats.total_sent++;
nbt_name_reply_send(nbtsock, src, packet);
failed:
talloc_free(packet);
}
/*
send a negative name query reply
*/
void nbtd_negative_name_query_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
struct socket_address *src)
{
struct nbt_name_packet *packet;
struct nbt_name *name = &request_packet->questions[0].name;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
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_FLAG_REPLY |
NBT_OPCODE_QUERY |
NBT_FLAG_AUTHORITATIVE |
NBT_RCODE_NAM;
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_NULL;
packet->answers[0].rr_class = NBT_QCLASS_IP;
packet->answers[0].ttl = 0;
ZERO_STRUCT(packet->answers[0].rdata);
DEBUG(7,("Sending negative name query 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);
}
/*
send a name registration reply
*/
void nbtd_name_registration_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
struct socket_address *src,
uint8_t rcode)
{
struct nbt_name_packet *packet;
struct nbt_name *name = &request_packet->questions[0].name;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
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_FLAG_REPLY |
NBT_OPCODE_REGISTER |
NBT_FLAG_AUTHORITATIVE |
NBT_FLAG_RECURSION_DESIRED |
NBT_FLAG_RECURSION_AVAIL |
rcode;
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_NETBIOS;
packet->answers[0].rr_class = NBT_QCLASS_IP;
packet->answers[0].ttl = request_packet->additional[0].ttl;
packet->answers[0].rdata = request_packet->additional[0].rdata;
DEBUG(7,("Sending %s name registration reply for %s to %s:%d\n",
rcode==0?"positive":"negative",
nbt_name_string(packet, name), src->addr, src->port));
nbtsrv->stats.total_sent++;
nbt_name_reply_send(nbtsock, src, packet);
failed:
talloc_free(packet);
}
/*
send a name release reply
*/
void nbtd_name_release_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
struct socket_address *src,
uint8_t rcode)
{
struct nbt_name_packet *packet;
struct nbt_name *name = &request_packet->questions[0].name;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
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_FLAG_REPLY |
NBT_OPCODE_RELEASE |
NBT_FLAG_AUTHORITATIVE |
rcode;
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_NETBIOS;
packet->answers[0].rr_class = NBT_QCLASS_IP;
packet->answers[0].ttl = request_packet->additional[0].ttl;
packet->answers[0].rdata = request_packet->additional[0].rdata;
DEBUG(7,("Sending %s name release reply for %s to %s:%d\n",
rcode==0?"positive":"negative",
nbt_name_string(packet, name), src->addr, src->port));
nbtsrv->stats.total_sent++;
nbt_name_reply_send(nbtsock, src, packet);
failed:
talloc_free(packet);
}
/*
send a WACK reply
*/
void nbtd_wack_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
struct socket_address *src,
uint32_t ttl)
{
struct nbt_name_packet *packet;
struct nbt_name *name = &request_packet->questions[0].name;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
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_FLAG_REPLY |
NBT_OPCODE_WACK |
NBT_FLAG_AUTHORITATIVE;
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_NETBIOS;
packet->answers[0].rr_class = NBT_QCLASS_IP;
packet->answers[0].ttl = ttl;
packet->answers[0].rdata.data.length = 2;
packet->answers[0].rdata.data.data = talloc_array(packet, uint8_t, 2);
if (packet->answers[0].rdata.data.data == NULL) goto failed;
RSSVAL(packet->answers[0].rdata.data.data, 0, request_packet->operation);
DEBUG(7,("Sending WACK 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);
}
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