83 lines
2.3 KiB
Go
83 lines
2.3 KiB
Go
// Copyright 2014 Mikio Hara. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tcp
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import (
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"net"
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"syscall"
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"github.com/mikioh/tcpopt"
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)
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var _ net.Conn = &Conn{}
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// SetOption sets a socket option.
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func (c *Conn) SetOption(o tcpopt.Option) error {
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if !c.ok() {
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return syscall.EINVAL
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}
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b, err := o.Marshal()
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if err != nil {
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return &net.OpError{Op: "raw-control", Net: c.LocalAddr().Network(), Source: nil, Addr: c.LocalAddr(), Err: err}
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}
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if err := c.setOption(o.Level(), o.Name(), b); err != nil {
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return &net.OpError{Op: "raw-control", Net: c.LocalAddr().Network(), Source: nil, Addr: c.LocalAddr(), Err: err}
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}
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return nil
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}
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// Option returns a socket option.
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func (c *Conn) Option(level, name int, b []byte) (tcpopt.Option, error) {
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if !c.ok() || len(b) == 0 {
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return nil, syscall.EINVAL
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}
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n, err := c.option(level, name, b)
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if err != nil {
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return nil, &net.OpError{Op: "raw-control", Net: c.LocalAddr().Network(), Source: nil, Addr: c.LocalAddr(), Err: err}
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}
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o, err := tcpopt.Parse(level, name, b[:n])
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if err != nil {
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return nil, &net.OpError{Op: "raw-control", Net: c.LocalAddr().Network(), Source: nil, Addr: c.LocalAddr(), Err: err}
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}
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return o, nil
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}
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// Buffered returns the number of bytes that can be read from the
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// underlying socket read buffer.
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// It returns -1 when the platform doesn't support this feature.
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func (c *Conn) Buffered() int {
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if !c.ok() {
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return -1
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}
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return c.buffered()
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}
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// Available returns how many bytes are unused in the underlying
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// socket write buffer.
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// It returns -1 when the platform doesn't support this feature.
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func (c *Conn) Available() int {
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if !c.ok() {
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return -1
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}
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return c.available()
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}
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// OriginalDst returns an original destination address, which is an
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// address not modified by intermediate entities such as network
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// address and port translators inside the kernel, on the connection.
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//
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// Only Linux and BSD variants using PF support this feature.
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func (c *Conn) OriginalDst() (net.Addr, error) {
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if !c.ok() {
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return nil, syscall.EINVAL
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}
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la := c.LocalAddr().(*net.TCPAddr)
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od, err := c.originalDst(la, c.RemoteAddr().(*net.TCPAddr))
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if err != nil {
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return nil, &net.OpError{Op: "raw-control", Net: c.LocalAddr().Network(), Source: nil, Addr: la, Err: err}
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}
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return od, nil
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}
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