mirror of
https://github.com/restic/restic.git
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60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
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// Copyright 2012 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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// +build !nacl,!plan9,!windows
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package ipv4
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import "net"
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func (c *payloadHandler) readFrom(b []byte) (n int, cm *ControlMessage, src net.Addr, err error) {
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c.rawOpt.RLock()
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oob := NewControlMessage(c.rawOpt.cflags)
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c.rawOpt.RUnlock()
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var nn int
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switch c := c.PacketConn.(type) {
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case *net.UDPConn:
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if n, nn, _, src, err = c.ReadMsgUDP(b, oob); err != nil {
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return 0, nil, nil, err
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}
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case *net.IPConn:
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nb := make([]byte, maxHeaderLen+len(b))
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if n, nn, _, src, err = c.ReadMsgIP(nb, oob); err != nil {
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return 0, nil, nil, err
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}
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hdrlen := int(nb[0]&0x0f) << 2
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copy(b, nb[hdrlen:])
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n -= hdrlen
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default:
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return 0, nil, nil, &net.OpError{Op: "read", Net: c.LocalAddr().Network(), Source: c.LocalAddr(), Err: errInvalidConnType}
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}
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if nn > 0 {
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cm = new(ControlMessage)
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if err = cm.Parse(oob[:nn]); err != nil {
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return 0, nil, nil, &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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}
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if cm != nil {
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cm.Src = netAddrToIP4(src)
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}
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return
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}
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func (c *payloadHandler) writeTo(b []byte, cm *ControlMessage, dst net.Addr) (n int, err error) {
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oob := cm.Marshal()
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if dst == nil {
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return 0, &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: errMissingAddress}
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}
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switch c := c.PacketConn.(type) {
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case *net.UDPConn:
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n, _, err = c.WriteMsgUDP(b, oob, dst.(*net.UDPAddr))
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case *net.IPConn:
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n, _, err = c.WriteMsgIP(b, oob, dst.(*net.IPAddr))
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default:
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return 0, &net.OpError{Op: "write", Net: c.LocalAddr().Network(), Source: c.LocalAddr(), Addr: opAddr(dst), Err: errInvalidConnType}
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}
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return
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}
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