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/*
* TLS Handshake Serialization
* (C) 2012,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_TLS_HANDSHAKE_IO_H__
#define BOTAN_TLS_HANDSHAKE_IO_H__
#include <botan/tls_magic.h>
#include <botan/tls_version.h>
#include <botan/loadstor.h>
#include <functional>
#include <vector>
#include <deque>
#include <map>
#include <set>
#include <utility>
namespace Botan {
namespace TLS {
class Handshake_Message;
/**
* Handshake IO Interface
*/
class Handshake_IO
{
public:
virtual Protocol_Version initial_record_version() const = 0;
virtual std::vector<byte> send(const Handshake_Message& msg) = 0;
virtual bool timeout_check() = 0;
virtual std::vector<byte> format(
const std::vector<byte>& handshake_msg,
Handshake_Type handshake_type) const = 0;
virtual void add_record(const std::vector<byte>& record,
Record_Type type,
u64bit sequence_number) = 0;
/**
* Returns (HANDSHAKE_NONE, std::vector<>()) if no message currently available
*/
virtual std::pair<Handshake_Type, std::vector<byte>>
get_next_record(bool expecting_ccs) = 0;
Handshake_IO() {}
Handshake_IO(const Handshake_IO&) = delete;
Handshake_IO& operator=(const Handshake_IO&) = delete;
virtual ~Handshake_IO() {}
};
/**
* Handshake IO for stream-based handshakes
*/
class Stream_Handshake_IO final : public Handshake_IO
{
public:
typedef std::function<void (byte, const std::vector<byte>&)> writer_fn;
Stream_Handshake_IO(writer_fn writer) : m_send_hs(writer) {}
Protocol_Version initial_record_version() const override;
bool timeout_check() override { return false; }
std::vector<byte> send(const Handshake_Message& msg) override;
std::vector<byte> format(
const std::vector<byte>& handshake_msg,
Handshake_Type handshake_type) const override;
void add_record(const std::vector<byte>& record,
Record_Type type,
u64bit sequence_number) override;
std::pair<Handshake_Type, std::vector<byte>>
get_next_record(bool expecting_ccs) override;
private:
std::deque<byte> m_queue;
writer_fn m_send_hs;
};
/**
* Handshake IO for datagram-based handshakes
*/
class Datagram_Handshake_IO final : public Handshake_IO
{
public:
typedef std::function<void (u16bit, byte, const std::vector<byte>&)> writer_fn;
Datagram_Handshake_IO(writer_fn writer,
class Connection_Sequence_Numbers& seq,
u16bit mtu, u64bit initial_timeout_ms, u64bit max_timeout_ms) :
m_seqs(seq),
m_flights(1),
m_initial_timeout(initial_timeout_ms),
m_max_timeout(max_timeout_ms),
m_send_hs(writer),
m_mtu(mtu)
{}
Protocol_Version initial_record_version() const override;
bool timeout_check() override;
std::vector<byte> send(const Handshake_Message& msg) override;
std::vector<byte> format(
const std::vector<byte>& handshake_msg,
Handshake_Type handshake_type) const override;
void add_record(const std::vector<byte>& record,
Record_Type type,
u64bit sequence_number) override;
std::pair<Handshake_Type, std::vector<byte>>
get_next_record(bool expecting_ccs) override;
private:
void retransmit_flight(size_t flight);
void retransmit_last_flight();
std::vector<byte> format_fragment(
const byte fragment[],
size_t fragment_len,
u16bit frag_offset,
u16bit msg_len,
Handshake_Type type,
u16bit msg_sequence) const;
std::vector<byte> format_w_seq(
const std::vector<byte>& handshake_msg,
Handshake_Type handshake_type,
u16bit msg_sequence) const;
std::vector<byte> send_message(u16bit msg_seq, u16bit epoch,
Handshake_Type msg_type,
const std::vector<byte>& msg);
class Handshake_Reassembly
{
public:
void add_fragment(const byte fragment[],
size_t fragment_length,
size_t fragment_offset,
u16bit epoch,
byte msg_type,
size_t msg_length);
bool complete() const;
u16bit epoch() const { return m_epoch; }
std::pair<Handshake_Type, std::vector<byte>> message() const;
private:
byte m_msg_type = HANDSHAKE_NONE;
size_t m_msg_length = 0;
u16bit m_epoch = 0;
// vector<bool> m_seen;
// vector<byte> m_fragments
std::map<size_t, byte> m_fragments;
std::vector<byte> m_message;
};
struct Message_Info
{
Message_Info(u16bit e, Handshake_Type mt, const std::vector<byte>& msg) :
epoch(e), msg_type(mt), msg_bits(msg) {}
Message_Info(const Message_Info& other) = default;
Message_Info() : epoch(0xFFFF), msg_type(HANDSHAKE_NONE) {}
u16bit epoch;
Handshake_Type msg_type;
std::vector<byte> msg_bits;
};
class Connection_Sequence_Numbers& m_seqs;
std::map<u16bit, Handshake_Reassembly> m_messages;
std::set<u16bit> m_ccs_epochs;
std::vector<std::vector<u16bit>> m_flights;
std::map<u16bit, Message_Info> m_flight_data;
u64bit m_initial_timeout = 0;
u64bit m_max_timeout = 0;
u64bit m_last_write = 0;
u64bit m_next_timeout = 0;
u16bit m_in_message_seq = 0;
u16bit m_out_message_seq = 0;
writer_fn m_send_hs;
u16bit m_mtu;
};
}
}
#endif
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