A FD adaptor that reads and writes TCP segments in UDP payloads. More...

#include <fd_adapter.hh>

Inheritance diagram for TCPOverUDPSocketAdapter:

Public Member Functions
	TCPOverUDPSocketAdapter (UDPSocket &&sock)
	Construct from a UDPSocket sliced into a FileDescriptor. More...

	operator const UDPSocket & () const
	Access the underlying UDP socket. More...

	operator UDPSocket & ()
	Access the underlying UDP socket. More...

std::optional< TCPSegment >	read ()
	Attempts to read and return a TCP segment related to the current connection from a UDP payload. More...

void	write (TCPSegment &seg)
	Writes a TCP segment into a UDP payload. More...

Public Member Functions inherited from FdAdapterBase
const FdAdapterConfig &	config () const
	Get the current configuration. More...

FdAdapterConfig &	config_mut ()
	Get the current configuration (mutable) More...

bool	listening () const
	Get the listening flag. More...

void	set_listening (const bool l)
	Set the listening flag. More...

void	tick (const size_t)
	Called periodically when time elapses. More...

Private Attributes
UDPSocket	_sock

Additional Inherited Members
Protected Member Functions inherited from FdAdapterBase
FdAdapterConfig &	config_mutable ()

Detailed Description

A FD adaptor that reads and writes TCP segments in UDP payloads.

Definition at line 46 of file fd_adapter.hh.

Constructor & Destructor Documentation

◆ TCPOverUDPSocketAdapter()

TCPOverUDPSocketAdapter::TCPOverUDPSocketAdapter ( UDPSocket && sock )

inlineexplicit

Construct from a UDPSocket sliced into a FileDescriptor.

Definition at line 52 of file fd_adapter.hh.

Member Function Documentation

◆ operator const UDPSocket &()

TCPOverUDPSocketAdapter::operator const UDPSocket & ( ) const

inline

Access the underlying UDP socket.

Definition at line 64 of file fd_adapter.hh.

◆ operator UDPSocket &()

TCPOverUDPSocketAdapter::operator UDPSocket & ( )

inline

Access the underlying UDP socket.

Definition at line 61 of file fd_adapter.hh.

◆ read()

optional< TCPSegment > TCPOverUDPSocketAdapter::read ( )

Attempts to read and return a TCP segment related to the current connection from a UDP payload.

This function first attempts to parse a TCP segment from the next UDP payload recv()d from the socket.

If this succeeds, it then checks that the received segment is related to the current connection. When a TCP connection has been established, this means checking that the source and destination ports in the TCP header are correct.

If the TCP FSM is listening (i.e., TCPOverUDPSocketAdapter::_listen is true) and the TCP segment read from the wire includes a SYN, this function clears the _listen flag and calls calls connect() on the underlying UDP socket, with the result that future outgoing segments go to the sender of the SYN segment.

Returns: a std::optional<TCPSegment> that is empty if the segment was invalid or unrelated

Definition at line 21 of file fd_adapter.cc.

◆ write()

void TCPOverUDPSocketAdapter::write ( TCPSegment & seg )

Writes a TCP segment into a UDP payload.

Serialize a TCP segment and send it as the payload of a UDP datagram.

Parameters

[in] seg is the TCP segment to write

Definition at line 50 of file fd_adapter.cc.

Member Data Documentation

◆ _sock

UDPSocket TCPOverUDPSocketAdapter::_sock

private

Definition at line 48 of file fd_adapter.hh.

The documentation for this class was generated from the following files:

/home/cs144/sponge/libsponge/tcp_helpers/fd_adapter.hh
/home/cs144/sponge/libsponge/tcp_helpers/fd_adapter.cc

Public Member Functions

Private Attributes

Additional Inherited Members