net

type Addr interface {
	Network() string // name of the network
	String() string  // string form of address
}

type AddrError struct {
	Err  string
	Addr string
}

type Conn interface {
	// Read reads data from the connection.
	// Read can be made to time out and return a Error with Timeout() == true
	// after a fixed time limit; see SetDeadline and SetReadDeadline.
	Read(b []byte) (n int, err error)

	// Write writes data to the connection.
	// Write can be made to time out and return a Error with Timeout() == true
	// after a fixed time limit; see SetDeadline and SetWriteDeadline.
	Write(b []byte) (n int, err error)

	// Close closes the connection.
	// Any blocked Read or Write operations will be unblocked and return errors.
	Close() error

	// LocalAddr returns the local network address.
	LocalAddr() Addr

	// RemoteAddr returns the remote network address.
	RemoteAddr() Addr

	// SetDeadline sets the read and write deadlines associated
	// with the connection. It is equivalent to calling both
	// SetReadDeadline and SetWriteDeadline.
	//
	// A deadline is an absolute time after which I/O operations
	// fail with a timeout (see type Error) instead of
	// blocking. The deadline applies to all future I/O, not just
	// the immediately following call to Read or Write.
	//
	// An idle timeout can be implemented by repeatedly extending
	// the deadline after successful Read or Write calls.
	//
	// A zero value for t means I/O operations will not time out.
	SetDeadline(t time.Time) error

	// SetReadDeadline sets the deadline for future Read calls.
	// A zero value for t means Read will not time out.
	SetReadDeadline(t time.Time) error

	// SetWriteDeadline sets the deadline for future Write calls.
	// Even if write times out, it may return n > 0, indicating that
	// some of the data was successfully written.
	// A zero value for t means Write will not time out.
	SetWriteDeadline(t time.Time) error
}

type DNSConfigError struct {
	Err error
}

type DNSError struct {
	Err       string // description of the error
	Name      string // name looked for
	Server    string // server used
	IsTimeout bool   // if true, timed out; not all timeouts set this
}

type Dialer struct {
	// Timeout is the maximum amount of time a dial will wait for
	// a connect to complete. If Deadline is also set, it may fail
	// earlier.
	//
	// The default is no timeout.
	//
	// When dialing a name with multiple IP addresses, the timeout
	// may be divided between them.
	//
	// With or without a timeout, the operating system may impose
	// its own earlier timeout. For instance, TCP timeouts are
	// often around 3 minutes.
	Timeout time.Duration

	// Deadline is the absolute point in time after which dials
	// will fail. If Timeout is set, it may fail earlier.
	// Zero means no deadline, or dependent on the operating system
	// as with the Timeout option.
	Deadline time.Time

	// LocalAddr is the local address to use when dialing an
	// address. The address must be of a compatible type for the
	// network being dialed.
	// If nil, a local address is automatically chosen.
	LocalAddr Addr

	// DualStack enables RFC 6555-compliant "Happy Eyeballs" dialing
	// when the network is "tcp" and the destination is a host name
	// with both IPv4 and IPv6 addresses. This allows a client to
	// tolerate networks where one address family is silently broken.
	DualStack bool

	// FallbackDelay specifies the length of time to wait before
	// spawning a fallback connection, when DualStack is enabled.
	// If zero, a default delay of 300ms is used.
	FallbackDelay time.Duration

	// KeepAlive specifies the keep-alive period for an active
	// network connection.
	// If zero, keep-alives are not enabled. Network protocols
	// that do not support keep-alives ignore this field.
	KeepAlive time.Duration
}

type Error interface {
	error
	Timeout() bool   // Is the error a timeout?
	Temporary() bool // Is the error temporary?
}

type Flags uint

type HardwareAddr []byte

type IP []byte

type IPAddr struct {
	IP   IP
	Zone string // IPv6 scoped addressing zone
}

type IPMask []byte

type IPNet struct {
	IP   IP     // network number
	Mask IPMask // network mask
}

type Interface struct {
	Index        int          // positive integer that starts at one, zero is never used
	MTU          int          // maximum transmission unit
	Name         string       // e.g., "en0", "lo0", "eth0.100"
	HardwareAddr HardwareAddr // IEEE MAC-48, EUI-48 and EUI-64 form
	Flags        Flags        // e.g., FlagUp, FlagLoopback, FlagMulticast
}

type InvalidAddrError string

type Listener interface {
	// Accept waits for and returns the next connection to the listener.
	Accept() (c Conn, err error)

	// Close closes the listener.
	// Any blocked Accept operations will be unblocked and return errors.
	Close() error

	// Addr returns the listener's network address.
	Addr() Addr
}

type MX struct {
	Host string
	Pref uint16
}

type NS struct {
	Host string
}

type OpError struct {
	// Op is the operation which caused the error, such as
	// "read" or "write".
	Op string

	// Net is the network type on which this error occurred,
	// such as "tcp" or "udp6".
	Net string

	// For operations involving a remote network connection, like
	// Dial, Read, or Write, Source is the corresponding local
	// network address.
	Source Addr

	// Addr is the network address for which this error occurred.
	// For local operations, like Listen or SetDeadline, Addr is
	// the address of the local endpoint being manipulated.
	// For operations involving a remote network connection, like
	// Dial, Read, or Write, Addr is the remote address of that
	// connection.
	Addr Addr

	// Err is the error that occurred during the operation.
	Err error
}

type PacketConn interface {
	// ReadFrom reads a packet from the connection,
	// copying the payload into b.  It returns the number of
	// bytes copied into b and the return address that
	// was on the packet.
	// ReadFrom can be made to time out and return
	// an error with Timeout() == true after a fixed time limit;
	// see SetDeadline and SetReadDeadline.
	ReadFrom(b []byte) (n int, addr Addr, err error)

	// WriteTo writes a packet with payload b to addr.
	// WriteTo can be made to time out and return
	// an error with Timeout() == true after a fixed time limit;
	// see SetDeadline and SetWriteDeadline.
	// On packet-oriented connections, write timeouts are rare.
	WriteTo(b []byte, addr Addr) (n int, err error)

	// Close closes the connection.
	// Any blocked ReadFrom or WriteTo operations will be unblocked and return errors.
	Close() error

	// LocalAddr returns the local network address.
	LocalAddr() Addr

	// SetDeadline sets the read and write deadlines associated
	// with the connection.
	SetDeadline(t time.Time) error

	// SetReadDeadline sets the deadline for future Read calls.
	// If the deadline is reached, Read will fail with a timeout
	// (see type Error) instead of blocking.
	// A zero value for t means Read will not time out.
	SetReadDeadline(t time.Time) error

	// SetWriteDeadline sets the deadline for future Write calls.
	// If the deadline is reached, Write will fail with a timeout
	// (see type Error) instead of blocking.
	// A zero value for t means Write will not time out.
	// Even if write times out, it may return n > 0, indicating that
	// some of the data was successfully written.
	SetWriteDeadline(t time.Time) error
}

type ParseError struct {
	// Type is the type of string that was expected, such as
	// "IP address", "CIDR address".
	Type string

	// Text is the malformed text string.
	Text string
}

type SRV struct {
	Target   string
	Port     uint16
	Priority uint16
	Weight   uint16
}

type TCPAddr struct {
	IP   IP
	Port int
	Zone string // IPv6 scoped addressing zone
}

type UDPAddr struct {
	IP   IP
	Port int
	Zone string // IPv6 scoped addressing zone
}

type UnixAddr struct {
	Name string
	Net  string
}

type UnknownNetworkError string