63 lines
1.3 KiB
Go
63 lines
1.3 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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// +build !go1.9
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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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"reflect"
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"runtime"
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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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c net.Conn
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}
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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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return &Conn{c: c}, nil
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}
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func (o *Option) get(c *Conn, b []byte) (int, error) {
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s, err := socketOf(c.c)
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if err != nil {
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return 0, err
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}
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n, err := getsockopt(s, o.Level, o.Name, b)
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return n, os.NewSyscallError("getsockopt", err)
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}
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func (o *Option) set(c *Conn, b []byte) error {
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s, err := socketOf(c.c)
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if err != nil {
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return err
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}
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return os.NewSyscallError("setsockopt", setsockopt(s, o.Level, o.Name, b))
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}
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func socketOf(c net.Conn) (uintptr, error) {
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switch c.(type) {
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case *net.TCPConn, *net.UDPConn, *net.IPConn:
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v := reflect.ValueOf(c)
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switch e := v.Elem(); e.Kind() {
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case reflect.Struct:
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fd := e.FieldByName("conn").FieldByName("fd")
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switch e := fd.Elem(); e.Kind() {
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case reflect.Struct:
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sysfd := e.FieldByName("sysfd")
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if runtime.GOOS == "windows" {
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return uintptr(sysfd.Uint()), nil
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}
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return uintptr(sysfd.Int()), nil
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}
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}
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}
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return 0, errors.New("invalid type")
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}
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