boost::optional<boost::asio::const_buffer> proxy<arp_frame>::process_frame(const_helper<ethernet_frame> ethernet_helper, const_helper<arp_frame> arp_helper, boost::asio::mutable_buffer response_buffer) const
{
if (arp_helper.operation() == ARP_REQUEST_OPERATION)
{
const entry_map_type::const_iterator entry_it = m_entry_map.find(arp_helper.target_logical_address());
ethernet_address_type eth_addr;
bool should_answer = false;
if (entry_it != m_entry_map.end())
{
eth_addr = entry_it->second;
should_answer = true;
}
else
{
if (m_arp_request_callback)
{
should_answer = m_arp_request_callback(arp_helper.target_logical_address(), eth_addr);
}
}
if (should_answer)
{
size_t payload_size;
builder<arp_frame> arp_builder(response_buffer);
payload_size = arp_builder.write(
ARP_REPLY_OPERATION,
boost::asio::buffer(eth_addr.data()),
arp_helper.target_logical_address(),
arp_helper.sender_hardware_address(),
arp_helper.sender_logical_address()
);
builder<ethernet_frame> ethernet_builder(response_buffer, payload_size);
payload_size = ethernet_builder.write(
ethernet_helper.sender(),
ethernet_helper.target(),
ethernet_helper.protocol()
);
return boost::make_optional<boost::asio::const_buffer>(response_buffer + (boost::asio::buffer_size(response_buffer) - payload_size));
}
}
return boost::optional<boost::asio::const_buffer>();
}
void proxy<arp_frame>::do_handle_frame(const_helper<ethernet_frame> ethernet_helper, const_helper<arp_frame> arp_helper)
{
if (arp_helper.operation() == ARP_REQUEST_OPERATION)
{
entry_map_type::const_iterator entry_it = m_entry_map.find(arp_helper.target_logical_address());
ethernet_address_type eth_addr;
bool should_answer = false;
if (entry_it != m_entry_map.end())
{
eth_addr = entry_it->second;
should_answer = true;
}
else
{
if (m_arp_request_callback)
{
should_answer = m_arp_request_callback(arp_helper.target_logical_address(), eth_addr);
}
}
if (should_answer)
{
size_t payload_size;
builder<arp_frame> arp_builder(response_buffer());
payload_size = arp_builder.write(
ARP_REPLY_OPERATION,
boost::asio::buffer(eth_addr.data()),
arp_helper.target_logical_address(),
arp_helper.sender_hardware_address(),
arp_helper.sender_logical_address()
);
builder<ethernet_frame> ethernet_builder(response_buffer(), payload_size);
payload_size = ethernet_builder.write(
ethernet_helper.sender(),
ethernet_helper.target(),
ethernet_helper.protocol()
);
data_available(get_truncated_response_buffer(payload_size));
}
}
}
