92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
// Copyright 2017 The Go Authors. 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 socket
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import (
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"errors"
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"net"
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"os"
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"syscall"
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)
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// A Conn represents a raw connection.
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type Conn struct {
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network string
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c syscall.RawConn
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}
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// tcpConn is an interface implemented by net.TCPConn.
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// It can be used for interface assertions to check if a net.Conn is a TCP connection.
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type tcpConn interface {
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SyscallConn() (syscall.RawConn, error)
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SetLinger(int) error
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}
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var _ tcpConn = (*net.TCPConn)(nil)
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// udpConn is an interface implemented by net.UDPConn.
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// It can be used for interface assertions to check if a net.Conn is a UDP connection.
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type udpConn interface {
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SyscallConn() (syscall.RawConn, error)
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ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error)
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}
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var _ udpConn = (*net.UDPConn)(nil)
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// ipConn is an interface implemented by net.IPConn.
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// It can be used for interface assertions to check if a net.Conn is an IP connection.
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type ipConn interface {
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SyscallConn() (syscall.RawConn, error)
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ReadMsgIP(b, oob []byte) (n, oobn, flags int, addr *net.IPAddr, err error)
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}
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var _ ipConn = (*net.IPConn)(nil)
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// NewConn returns a new raw connection.
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func NewConn(c net.Conn) (*Conn, error) {
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var err error
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var cc Conn
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switch c := c.(type) {
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case tcpConn:
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cc.network = "tcp"
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cc.c, err = c.SyscallConn()
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case udpConn:
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cc.network = "udp"
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cc.c, err = c.SyscallConn()
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case ipConn:
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cc.network = "ip"
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cc.c, err = c.SyscallConn()
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default:
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return nil, errors.New("unknown connection type")
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}
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if err != nil {
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return nil, err
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}
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return &cc, nil
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}
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func (o *Option) get(c *Conn, b []byte) (int, error) {
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var operr error
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var n int
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fn := func(s uintptr) {
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n, operr = getsockopt(s, o.Level, o.Name, b)
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}
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if err := c.c.Control(fn); err != nil {
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return 0, err
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}
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return n, os.NewSyscallError("getsockopt", operr)
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}
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func (o *Option) set(c *Conn, b []byte) error {
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var operr error
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fn := func(s uintptr) {
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operr = setsockopt(s, o.Level, o.Name, b)
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}
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if err := c.c.Control(fn); err != nil {
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return err
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}
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return os.NewSyscallError("setsockopt", operr)
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}
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