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62 lines
1.3 KiB
62 lines
1.3 KiB
// 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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