github.com/icodeface/tls@v0.0.0-20230910023335-34df9250cd12/internal/x/net/route/route_classic.go (about) 1 // Copyright 2016 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 darwin dragonfly freebsd netbsd 6 7 package route 8 9 import ( 10 "runtime" 11 "syscall" 12 ) 13 14 func (m *RouteMessage) marshal() ([]byte, error) { 15 w, ok := wireFormats[m.Type] 16 if !ok { 17 return nil, errUnsupportedMessage 18 } 19 l := w.bodyOff + addrsSpace(m.Addrs) 20 if runtime.GOOS == "darwin" { 21 // Fix stray pointer writes on macOS. 22 // See golang.org/issue/22456. 23 l += 1024 24 } 25 b := make([]byte, l) 26 nativeEndian.PutUint16(b[:2], uint16(l)) 27 if m.Version == 0 { 28 b[2] = sysRTM_VERSION 29 } else { 30 b[2] = byte(m.Version) 31 } 32 b[3] = byte(m.Type) 33 nativeEndian.PutUint32(b[8:12], uint32(m.Flags)) 34 nativeEndian.PutUint16(b[4:6], uint16(m.Index)) 35 nativeEndian.PutUint32(b[16:20], uint32(m.ID)) 36 nativeEndian.PutUint32(b[20:24], uint32(m.Seq)) 37 attrs, err := marshalAddrs(b[w.bodyOff:], m.Addrs) 38 if err != nil { 39 return nil, err 40 } 41 if attrs > 0 { 42 nativeEndian.PutUint32(b[12:16], uint32(attrs)) 43 } 44 return b, nil 45 } 46 47 func (w *wireFormat) parseRouteMessage(typ RIBType, b []byte) (Message, error) { 48 if len(b) < w.bodyOff { 49 return nil, errMessageTooShort 50 } 51 l := int(nativeEndian.Uint16(b[:2])) 52 if len(b) < l { 53 return nil, errInvalidMessage 54 } 55 m := &RouteMessage{ 56 Version: int(b[2]), 57 Type: int(b[3]), 58 Flags: int(nativeEndian.Uint32(b[8:12])), 59 Index: int(nativeEndian.Uint16(b[4:6])), 60 ID: uintptr(nativeEndian.Uint32(b[16:20])), 61 Seq: int(nativeEndian.Uint32(b[20:24])), 62 extOff: w.extOff, 63 raw: b[:l], 64 } 65 errno := syscall.Errno(nativeEndian.Uint32(b[28:32])) 66 if errno != 0 { 67 m.Err = errno 68 } 69 var err error 70 m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[w.bodyOff:]) 71 if err != nil { 72 return nil, err 73 } 74 return m, nil 75 }