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 | "syscall" |
| 14 | ) |
| 15 | |
| 16 | // A Conn represents a raw connection. |
| 17 | type Conn struct { |
| 18 | network string |
| 19 | c syscall.RawConn |
| 20 | } |
| 21 | |
| 22 | // NewConn returns a new raw connection. |
| 23 | func NewConn(c net.Conn) (*Conn, error) { |
| 24 | var err error |
| 25 | var cc Conn |
| 26 | switch c := c.(type) { |
| 27 | case *net.TCPConn: |
| 28 | cc.network = "tcp" |
| 29 | cc.c, err = c.SyscallConn() |
| 30 | case *net.UDPConn: |
| 31 | cc.network = "udp" |
| 32 | cc.c, err = c.SyscallConn() |
| 33 | case *net.IPConn: |
| 34 | cc.network = "ip" |
| 35 | cc.c, err = c.SyscallConn() |
| 36 | default: |
| 37 | return nil, errors.New("unknown connection type") |
| 38 | } |
| 39 | if err != nil { |
| 40 | return nil, err |
| 41 | } |
| 42 | return &cc, nil |
| 43 | } |
| 44 | |
| 45 | func (o *Option) get(c *Conn, b []byte) (int, error) { |
| 46 | var operr error |
| 47 | var n int |
| 48 | fn := func(s uintptr) { |
| 49 | n, operr = getsockopt(s, o.Level, o.Name, b) |
| 50 | } |
| 51 | if err := c.c.Control(fn); err != nil { |
| 52 | return 0, err |
| 53 | } |
| 54 | return n, os.NewSyscallError("getsockopt", operr) |
| 55 | } |
| 56 | |
| 57 | func (o *Option) set(c *Conn, b []byte) error { |
| 58 | var operr error |
| 59 | fn := func(s uintptr) { |
| 60 | operr = setsockopt(s, o.Level, o.Name, b) |
| 61 | } |
| 62 | if err := c.c.Control(fn); err != nil { |
| 63 | return err |
| 64 | } |
| 65 | return os.NewSyscallError("setsockopt", operr) |
| 66 | } |