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Prepare DNS decoding

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This commit is contained in:
Baptiste Wicht 2016-09-11 11:05:46 +02:00
parent 5eeed9b206
commit 3eef5e0699
3 changed files with 95 additions and 2 deletions
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49
kernel/include/net/dns_layer.hpp Normal file
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@ -0,0 +1,49 @@
//=======================================================================
// Copyright Baptiste Wicht 2013-2016.
// Distributed under the terms of the MIT License.
// (See accompanying file LICENSE or copy at
// http://www.opensource.org/licenses/MIT)
//=======================================================================
#ifndef NET_DNS_LAYER_H
#define NET_DNS_LAYER_H
#include <types.hpp>
#include "net/ethernet_layer.hpp"
#include "net/ip_layer.hpp"
#include "net/network.hpp"
namespace network {
namespace dns {
struct flags_t {
uint8_t qr : 1;
uint8_t opcode : 4;
uint8_t aa : 1;
uint8_t tc : 1;
uint8_t rd : 1;
uint8_t ra : 1;
uint8_t zeroes : 3;
uint8_t rcode : 4;
} __attribute__((packed));
static_assert(sizeof(flags_t) == 2, "DNS flags must be 16 bits");
struct header {
uint16_t identification;
flags_t flags;
uint16_t questions;
uint16_t answers;
uint16_t authority_rrs;
uint16_t additional_rrs;
} __attribute__((packed));
void decode(network::interface_descriptor& interface, network::ethernet::packet& packet);
} // end of dns namespace
} // end of network namespace
#endif

41
kernel/src/net/dns_layer.cpp Normal file
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@ -0,0 +1,41 @@
//=======================================================================
// Copyright Baptiste Wicht 2013-2016.
// Distributed under the terms of the MIT License.
// (See accompanying file LICENSE or copy at
// http://www.opensource.org/licenses/MIT)
//=======================================================================
#include "net/dns_layer.hpp"
#include "kernel_utils.hpp"
namespace {
} //end of anonymous namespace
void network::dns::decode(network::interface_descriptor& /*interface*/, network::ethernet::packet& packet){
packet.tag(3, packet.index);
auto* dns_header = reinterpret_cast<header*>(packet.payload + packet.index);
logging::logf(logging::log_level::TRACE, "dns: Start DNS packet handling\n");
auto identification = switch_endian_16(dns_header->identification);
auto questions = switch_endian_16(dns_header->questions);
auto answers = switch_endian_16(dns_header->answers);
logging::logf(logging::log_level::TRACE, "dns: Identification %h \n", size_t(identification));
logging::logf(logging::log_level::TRACE, "dns: Questions %h \n", size_t(questions));
logging::logf(logging::log_level::TRACE, "dns: Answers %h \n", size_t(answers));
auto flags = dns_header->flags;
if(flags.qr){
logging::logf(logging::log_level::TRACE, "dns: Query\n");
} else {
logging::logf(logging::log_level::TRACE, "dns: Response\n");
}
//TODO
}

7
kernel/src/net/udp_layer.cpp
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@ -6,6 +6,7 @@
//=======================================================================
#include "net/udp_layer.hpp"
#include "net/dns_layer.hpp"
#include "kernel_utils.hpp"
@ -69,7 +70,7 @@ void prepare_packet(network::ethernet::packet& packet, size_t source, size_t tar
} //end of anonymous namespace
void network::udp::decode(network::interface_descriptor& /*interface*/, network::ethernet::packet& packet){
void network::udp::decode(network::interface_descriptor& interface, network::ethernet::packet& packet){
packet.tag(2, packet.index);
auto* udp_header = reinterpret_cast<header*>(packet.payload + packet.index);
@ -84,8 +85,10 @@ void network::udp::decode(network::interface_descriptor& /*interface*/, network:
logging::logf(logging::log_level::TRACE, "udp: Target Port %h \n", target_port);
logging::logf(logging::log_level::TRACE, "udp: Length %h \n", length);
packet.index += sizeof(header);
if(target_port == 53){
//TODO DNS decoding
network::dns::decode(interface, packet);
}
}