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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 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"
/*
we received a badly formed packet - log it
*/
void nbtd_bad_packet(struct nbt_name_packet *packet,
const char *src_address, const char *reason)
{
DEBUG(2,("nbtd: bad packet '%s' from %s\n", reason, src_address));
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(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
const char *src_address, int src_port)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
struct nbtd_interface);
struct nbtd_server *nbtsrv = iface->nbtsrv;
/* if its not a broadcast then its not considered a self packet */
if (!(packet->operation & NBT_FLAG_BROADCAST)) {
return False;
}
/* if its not from the nbt port, then it wasn't a broadcast from us */
if (src_port != lp_nbt_port()) {
return False;
}
/* this uses the fact that iface->nbtsock is our non-broadcast
listen address */
if (iface->nbtsock == nbtsock &&
iface != iface->nbtsrv->bcast_interface) {
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_address, 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,
const char *src_address, int src_port,
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);
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_AUTHORITIVE |
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<%02x> at %s to %s:%d\n",
name->name, name->type, addresses[0], src_address, src_port));
nbt_name_reply_send(nbtsock, src_address, src_port, 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,
const char *src_address, int src_port)
{
struct nbt_name_packet *packet;
struct nbt_name *name = &request_packet->questions[0].name;
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_AUTHORITIVE |
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<%02x> to %s:%d\n",
name->name, name->type, src_address, src_port));
nbt_name_reply_send(nbtsock, src_address, src_port, packet);
failed:
talloc_free(packet);
}
/*
send a name defense reply
*/
void nbtd_negative_name_registration_reply(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *request_packet,
const char *src_address, int src_port)
{
struct nbt_name_packet *packet;
struct nbt_name *name = &request_packet->questions[0].name;
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_AUTHORITIVE |
NBT_FLAG_RECURSION_DESIRED |
NBT_FLAG_RECURSION_AVAIL |
NBT_RCODE_ACT;
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 = 0;
packet->answers[0].rdata = request_packet->additional[0].rdata;
DEBUG(7,("Sending negative name registration reply for %s<%02x> to %s:%d\n",
name->name, name->type, src_address, src_port));
nbt_name_reply_send(nbtsock, src_address, src_port, packet);
failed:
talloc_free(packet);
}
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