/*

* TLS Protocol Version Management

* (C) 2012 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/tls_version.h>

#include <botan/tls_exceptn.h>

namespace Botan {

namespace TLS {

std::string Protocol_Version::to_string() const

   {

   const uint8_t maj = major_version();

   const uint8_t min = minor_version();

   if(maj == 3 && min == 0)

      return "SSL v3";

   if(maj == 3 && min >= 1) // TLS v1.x

      return "TLS v1." + std::to_string(min-1);

   if(maj == 254) // DTLS 1.x

      return "DTLS v1." + std::to_string(255 - min);

   // Some very new or very old protocol (or bogus data)

   return "Unknown " + std::to_string(maj) + "." + std::to_string(min);

   }

bool Protocol_Version::is_datagram_protocol() const

   {

   return major_version() > 250;

   }

bool Protocol_Version::operator>(const Protocol_Version& other) const

   {

   if(this->is_datagram_protocol() != other.is_datagram_protocol())

      throw TLS_Exception(Alert::PROTOCOL_VERSION,

                          "Version comparing " + to_string() +

                          " with " + other.to_string());

   if(this->is_datagram_protocol())

      return m_version < other.m_version; // goes backwards

   return m_version > other.m_version;

   }

bool Protocol_Version::known_version() const

   {

   return (m_version == Protocol_Version::TLS_V12 ||

           m_version == Protocol_Version::DTLS_V12);

   }

}

}