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#pragma once
#include <iostream>
#include <numeric>
#include "message.hpp"
#include "message_parsers.hpp"
#include "session.hpp"
namespace message
{
class Handler
{
public:
explicit Handler(std::shared_ptr<udpsocket::Channel> inChannel):
channel(inChannel) {}
Handler() = delete;
~Handler() = default;
Handler(const Handler&) = default;
Handler& operator=(const Handler&) = default;
Handler(Handler&&) = default;
Handler& operator=(Handler&&) = default;
/*
* @brief Receive the IPMI packet
*
* Read the data on the socket, get the parser based on the Session
* header type and flatten the payload and generate the IPMI message
*
* @return IPMI Message on success and nullptr on failure
*
*/
std::unique_ptr<Message> receive();
/*
* @brief Process the incoming IPMI message
*
* The incoming message payload is handled and the command handler for
* the Network function and Command is executed and the response message
* is returned
*
* @param[in] inMessage - Incoming Message
*
* @return Outgoing message on success and nullptr on failure
*/
std::unique_ptr<Message> executeCommand(Message& inMessage);
/*
* @brief Send the outgoing message
*
* The payload in the outgoing message is flattened and sent out on the
* socket
*
* @param[in] outMessage - Outgoing Message
*
* @return Zero on success and <0 on failure
*/
int send(Message& outMessage);
// BMC Session ID for the Channel
session::SessionID sessionID;
private:
// Socket channel for communicating with the remote client
std::shared_ptr<udpsocket::Channel> channel;
// IPMI 1.5 or IPMI 2.0 Session Header
parser::SessionHeader sessionHeader;
/*
* @brief Create the response IPMI message
*
* The IPMI outgoing message is constructed out of payload and the
* corresponding fields are populated.For the payload type IPMI, the
* LAN message header and trailer are added.
*
* @tparam[in] T - Outgoing message payload type
* @param[in] output - Payload for outgoing message
* @param[in] inMessage - Incoming IPMI message
*
* @return Outgoing message on success and nullptr on failure
*/
template<PayloadType T>
std::unique_ptr<Message> createResponse(std::vector<uint8_t>& output,
Message& inMessage)
{
auto outMessage = std::make_unique<Message>();
outMessage->payloadType = T;
outMessage->payload = output;
return outMessage;
}
/*
* @brief Extract the command from the IPMI payload
*
* @param[in] message - Incoming message
*
* @return Command ID in the incoming message
*/
uint32_t getCommand(Message& message);
/*
* @brief Calculate 8 bit 2's complement checksum
*
* Initialize checksum to 0. For each byte, checksum = (checksum + byte)
* modulo 256. Then checksum = - checksum. When the checksum and the
* bytes are added together, modulo 256, the result should be 0.
*/
uint8_t crc8bit(const uint8_t* ptr, const size_t len)
{
return (0x100 - std::accumulate(ptr,ptr+len,0));
}
};
} //namespace message
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