64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package socket
|
|
|
|
import (
|
|
"errors"
|
|
"net"
|
|
"os"
|
|
"syscall"
|
|
)
|
|
|
|
// A Conn represents a raw connection.
|
|
type Conn struct {
|
|
network string
|
|
c syscall.RawConn
|
|
}
|
|
|
|
// NewConn returns a new raw connection.
|
|
func NewConn(c net.Conn) (*Conn, error) {
|
|
var err error
|
|
var cc Conn
|
|
switch c := c.(type) {
|
|
case *net.TCPConn:
|
|
cc.network = "tcp"
|
|
cc.c, err = c.SyscallConn()
|
|
case *net.UDPConn:
|
|
cc.network = "udp"
|
|
cc.c, err = c.SyscallConn()
|
|
case *net.IPConn:
|
|
cc.network = "ip"
|
|
cc.c, err = c.SyscallConn()
|
|
default:
|
|
return nil, errors.New("unknown connection type")
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &cc, nil
|
|
}
|
|
|
|
func (o *Option) get(c *Conn, b []byte) (int, error) {
|
|
var operr error
|
|
var n int
|
|
fn := func(s uintptr) {
|
|
n, operr = getsockopt(s, o.Level, o.Name, b)
|
|
}
|
|
if err := c.c.Control(fn); err != nil {
|
|
return 0, err
|
|
}
|
|
return n, os.NewSyscallError("getsockopt", operr)
|
|
}
|
|
|
|
func (o *Option) set(c *Conn, b []byte) error {
|
|
var operr error
|
|
fn := func(s uintptr) {
|
|
operr = setsockopt(s, o.Level, o.Name, b)
|
|
}
|
|
if err := c.c.Control(fn); err != nil {
|
|
return err
|
|
}
|
|
return os.NewSyscallError("setsockopt", operr)
|
|
}
|