David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2017 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // +build !go1.9 |
| 6 | |
| 7 | package socket |
| 8 | |
| 9 | import ( |
| 10 | "errors" |
| 11 | "net" |
| 12 | "os" |
| 13 | "reflect" |
| 14 | "runtime" |
| 15 | ) |
| 16 | |
| 17 | // A Conn represents a raw connection. |
| 18 | type Conn struct { |
| 19 | c net.Conn |
| 20 | } |
| 21 | |
| 22 | // NewConn returns a new raw connection. |
| 23 | func NewConn(c net.Conn) (*Conn, error) { |
| 24 | return &Conn{c: c}, nil |
| 25 | } |
| 26 | |
| 27 | func (o *Option) get(c *Conn, b []byte) (int, error) { |
| 28 | s, err := socketOf(c.c) |
| 29 | if err != nil { |
| 30 | return 0, err |
| 31 | } |
| 32 | n, err := getsockopt(s, o.Level, o.Name, b) |
| 33 | return n, os.NewSyscallError("getsockopt", err) |
| 34 | } |
| 35 | |
| 36 | func (o *Option) set(c *Conn, b []byte) error { |
| 37 | s, err := socketOf(c.c) |
| 38 | if err != nil { |
| 39 | return err |
| 40 | } |
| 41 | return os.NewSyscallError("setsockopt", setsockopt(s, o.Level, o.Name, b)) |
| 42 | } |
| 43 | |
| 44 | func socketOf(c net.Conn) (uintptr, error) { |
| 45 | switch c.(type) { |
| 46 | case *net.TCPConn, *net.UDPConn, *net.IPConn: |
| 47 | v := reflect.ValueOf(c) |
| 48 | switch e := v.Elem(); e.Kind() { |
| 49 | case reflect.Struct: |
| 50 | fd := e.FieldByName("conn").FieldByName("fd") |
| 51 | switch e := fd.Elem(); e.Kind() { |
| 52 | case reflect.Struct: |
| 53 | sysfd := e.FieldByName("sysfd") |
| 54 | if runtime.GOOS == "windows" { |
| 55 | return uintptr(sysfd.Uint()), nil |
| 56 | } |
| 57 | return uintptr(sysfd.Int()), nil |
| 58 | } |
| 59 | } |
| 60 | } |
| 61 | return 0, errors.New("invalid type") |
| 62 | } |