Application_Layer_Protocol_Notification::Application_Layer_Protocol_Notification(TLS_Data_Reader& reader,
u16bit extension_size)
{
if(extension_size == 0)
return; // empty extension
const u16bit name_bytes = reader.get_u16bit();
size_t bytes_remaining = extension_size - 2;
if(name_bytes != bytes_remaining)
throw Decoding_Error("Bad encoding of ALPN extension, bad length field");
while(bytes_remaining)
{
const std::string p = reader.get_string(1, 0, 255);
if(bytes_remaining < p.size() + 1)
throw Decoding_Error("Bad encoding of ALPN, length field too long");
bytes_remaining -= (p.size() + 1);
m_protocols.push_back(p);
}
}
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;
}
}
}
SRP_Identifier::SRP_Identifier(TLS_Data_Reader& reader,
u16bit extension_size)
{
m_srp_identifier = reader.get_string(1, 1, 255);
if(m_srp_identifier.size() + 1 != extension_size)
throw Decoding_Error("Bad encoding for SRP identifier extension");
}
