fnet

Documentation

Index

• Constants
• Variables
• func ChangeMaxPayloadSize(newMaxPayloadSize int)
• func Copy(dst io.Writer, src io.Reader) (written int64, err error)
• func GeneratePayload(payloadFilePath string, payloadSize int, payload string) []byte
• func GenerateRandomPayload(payloadSize int) []byte
• func GetPort(lAddr net.Addr) string
• func GetUniqueUnixDomainPath(prefix string) string
• func Listen(name string, port string) (net.Listener, net.Addr)
• func NetCat(dest string, in io.Reader, out io.Writer, stopOnEOF bool) error
• func NormalizeHostPort(inputPort string, addr net.Addr) string
• func NormalizePort(port string) string
• func Proxy(port string, dest net.Addr) net.Addr
• func ProxyToDestination(listenPort string, destination string) net.Addr
• func ReadFileForPayload(payloadFilePath string) ([]byte, error)
• func Resolve(host string, port string) (*net.TCPAddr, error)
• func ResolveDestination(dest string) (*net.TCPAddr, error)
• func SetSocketBuffers(socket net.Conn, readBufferSize, writeBufferSize int)
• func SmallReadUntil(r io.Reader, stopByte byte, max int) ([]byte, bool, error)
• func TCPEchoServer(name string, port string) net.Addr
• func ValidatePayloadSize(size *int)

Constants

const (
	// DefaultGRPCPort is the Fortio gRPC server default port number.
	DefaultGRPCPort = "8079"
	// StandardHTTPPort is the Standard http port number.
	StandardHTTPPort = "80"
	// StandardHTTPSPort is the Standard https port number.
	StandardHTTPSPort = "443"
	// PrefixHTTP is a constant value for representing http protocol that can be added prefix of url.
	PrefixHTTP = "http://"
	// PrefixHTTPS is a constant value for representing secure http protocol that can be added prefix of url.
	PrefixHTTPS = "https://"

	// POST is a constant value that indicates http method as post.
	POST = "POST"
	// GET is a constant value that indicates http method as get.
	GET = "GET"
	// UnixDomainSocket type for network addresses.
	UnixDomainSocket = "unix"
)

Variables

var (
	// KILOBYTE is a constant for kilobyte (ie 1024).
	KILOBYTE = 1024
	// MaxPayloadSize is the maximum size of payload to be generated by the
	// EchoHandler size= argument. In bytes.
	MaxPayloadSize = 256 * KILOBYTE
	// Payload that is returned during echo call.
	Payload []byte
)

var ErrNilDestination = fmt.Errorf("nil destination")

ErrNilDestination returned when trying to proxy to a nil address.

Functions

func ChangeMaxPayloadSize

func ChangeMaxPayloadSize(newMaxPayloadSize int)

ChangeMaxPayloadSize is used to change max payload size and fill it with pseudorandom content.

func Copy

func Copy(dst io.Writer, src io.Reader) (written int64, err error)

Copy is a debug version of io.Copy without the zero Copy optimizations.

func GeneratePayload

func GeneratePayload(payloadFilePath string, payloadSize int, payload string) []byte

GeneratePayload generates a payload with given inputs. First tries filePath, then random payload, at last payload.

func GenerateRandomPayload

func GenerateRandomPayload(payloadSize int) []byte

GenerateRandomPayload generates a random payload with given input size.

func GetPort

func GetPort(lAddr net.Addr) string

GetPort extracts the port for TCP sockets and the path for unix domain sockets.

func GetUniqueUnixDomainPath

func GetUniqueUnixDomainPath(prefix string) string

GetUniqueUnixDomainPath returns a path to be used for unix domain socket.

func Listen

func Listen(name string, port string) (net.Listener, net.Addr)

Listen returns a listener for the port. Port can be a port or a bind address and a port (e.g. "8080" or "[::1]:8080"...). If the port component is 0 a free port will be returned by the system. If the port is a pathname (contains a /) a unix domain socket listener will be used instead of regular tcp socket. This logs critical on error and returns nil (is meant for servers that must start).

func NetCat

func NetCat(dest string, in io.Reader, out io.Writer, stopOnEOF bool) error

NetCat connects to the destination and reads from in, sends to the socket, and write what it reads from the socket to out.

func NormalizeHostPort

func NormalizeHostPort(inputPort string, addr net.Addr) string

NormalizeHostPort generates host:port string for the address or uses localhost instead of [::] when the original port binding input didn't specify an address.

func NormalizePort

func NormalizePort(port string) string

NormalizePort parses port and returns host:port if port is in the form of host:port already or :port if port is only a port (doesn't contain :).

func Proxy

func Proxy(port string, dest net.Addr) net.Addr

Proxy starts a tcp proxy.

func ProxyToDestination

func ProxyToDestination(listenPort string, destination string) net.Addr

ProxyToDestination opens a proxy from the listenPort (or addr:port or unix domain socket path) and forwards all traffic to destination (host:port).

func ReadFileForPayload

func ReadFileForPayload(payloadFilePath string) ([]byte, error)

ReadFileForPayload reads the file from given input path.

func Resolve

func Resolve(host string, port string) (*net.TCPAddr, error)

Resolve returns the TCP address of the host,port suitable for net.Dial. nil in case of errors.

func ResolveDestination

func ResolveDestination(dest string) (*net.TCPAddr, error)

ResolveDestination returns the TCP address of the "host:port" suitable for net.Dial. nil in case of errors.

func SetSocketBuffers

func SetSocketBuffers(socket net.Conn, readBufferSize, writeBufferSize int)

SetSocketBuffers sets the read and write buffer size of the socket. Also sets tcp SetNoDelay().

func SmallReadUntil

func SmallReadUntil(r io.Reader, stopByte byte, max int) ([]byte, bool, error)

SmallReadUntil will read one byte at a time until stopByte is found and up to max bytes total. Returns what was read (without the stop byte when found), whether the stop byte was found, whether an error occurred (eof...). Because we read one by one directly (no buffer) this should only be used for short variable length preamble type read.

func TCPEchoServer

func TCPEchoServer(name string, port string) net.Addr

TCPEchoServer starts a TCP Echo Server on given port, name is for logging.

func ValidatePayloadSize

func ValidatePayloadSize(size *int)

ValidatePayloadSize compares input size with MaxPayLoadSize. If size exceeds the MaxPayloadSize size will set to MaxPayLoadSize.