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| 1 // Copyright 2012 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 package ipv4 |
| 6 |
| 7 import ( |
| 8 "net" |
| 9 "reflect" |
| 10 "syscall" |
| 11 ) |
| 12 |
| 13 func (c *genericOpt) sysfd() (syscall.Handle, error) { |
| 14 switch p := c.c.(type) { |
| 15 case *net.TCPConn, *net.UDPConn, *net.IPConn: |
| 16 return sysfd(p) |
| 17 } |
| 18 return syscall.InvalidHandle, errInvalidConnType |
| 19 } |
| 20 |
| 21 func (c *dgramOpt) sysfd() (syscall.Handle, error) { |
| 22 switch p := c.c.(type) { |
| 23 case *net.UDPConn, *net.IPConn: |
| 24 return sysfd(p.(net.Conn)) |
| 25 } |
| 26 return syscall.InvalidHandle, errInvalidConnType |
| 27 } |
| 28 |
| 29 func (c *payloadHandler) sysfd() (syscall.Handle, error) { |
| 30 return sysfd(c.c.(net.Conn)) |
| 31 } |
| 32 |
| 33 func (c *packetHandler) sysfd() (syscall.Handle, error) { |
| 34 return sysfd(c.c) |
| 35 } |
| 36 |
| 37 func sysfd(c net.Conn) (syscall.Handle, error) { |
| 38 cv := reflect.ValueOf(c) |
| 39 switch ce := cv.Elem(); ce.Kind() { |
| 40 case reflect.Struct: |
| 41 fd := ce.FieldByName("conn").FieldByName("fd") |
| 42 switch fe := fd.Elem(); fe.Kind() { |
| 43 case reflect.Struct: |
| 44 sysfd := fe.FieldByName("sysfd") |
| 45 return syscall.Handle(sysfd.Uint()), nil |
| 46 } |
| 47 } |
| 48 return syscall.InvalidHandle, errInvalidConnType |
| 49 } |
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