void Extensions::deserialize(TLS_Data_Reader& reader)
{
if(reader.has_remaining())
{
const u16bit all_extn_size = reader.get_u16bit();
if(reader.remaining_bytes() != all_extn_size)
throw Decoding_Error("Bad extension size");
while(reader.has_remaining())
{
const u16bit extension_code = reader.get_u16bit();
const u16bit extension_size = reader.get_u16bit();
Extension* extn = make_extension(reader,
extension_code,
extension_size);
if(extn)
this->add(extn);
else // unknown/unhandled extension
reader.discard_next(extension_size);
}
}
}
Server_Name_Indicator::Server_Name_Indicator(TLS_Data_Reader& reader,
u16bit extension_size)
{
/*
* This is used by the server to confirm that it knew the name
*/
if(extension_size == 0)
return;
u16bit name_bytes = reader.get_u16bit();
if(name_bytes + 2 != extension_size)
throw Decoding_Error("Bad encoding of SNI extension");
while(name_bytes)
{
byte name_type = reader.get_byte();
name_bytes--;
if(name_type == 0) // DNS
{
m_sni_host_name = reader.get_string(2, 1, 65535);
name_bytes -= (2 + m_sni_host_name.size());
}
else // some other unknown name type
{
reader.discard_next(name_bytes);
name_bytes = 0;
}
}
}