mirror of
https://github.com/osrg/gobgp.git
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92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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import (
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"net"
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"os"
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"strings"
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"syscall"
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"unsafe"
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)
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const (
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TCP_MD5SIG = 14
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)
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type tcpmd5sig struct {
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ss_family uint16
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ss [126]byte
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pad1 uint16
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keylen uint16
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pad2 uint32
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key [80]byte
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}
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func buildTcpMD5Sig(address string, key string) (tcpmd5sig, error) {
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t := tcpmd5sig{}
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addr := net.ParseIP(address)
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if addr.To4() != nil {
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t.ss_family = syscall.AF_INET
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copy(t.ss[2:], addr.To4())
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} else {
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t.ss_family = syscall.AF_INET6
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copy(t.ss[6:], addr.To16())
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}
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t.keylen = uint16(len(key))
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copy(t.key[0:], []byte(key))
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return t, nil
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}
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func SetTcpMD5SigSockopts(l *net.TCPListener, address string, key string) error {
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t, _ := buildTcpMD5Sig(address, key)
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fi, err := l.File()
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defer fi.Close()
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if err != nil {
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return err
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}
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if l, err := net.FileListener(fi); err == nil {
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defer l.Close()
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}
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_, _, e := syscall.Syscall6(syscall.SYS_SETSOCKOPT, fi.Fd(),
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uintptr(syscall.IPPROTO_TCP), uintptr(TCP_MD5SIG),
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uintptr(unsafe.Pointer(&t)), unsafe.Sizeof(t), 0)
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if e > 0 {
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return e
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}
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return nil
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}
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func SetTcpTTLSockopts(conn *net.TCPConn, ttl int) error {
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level := syscall.IPPROTO_IP
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name := syscall.IP_TTL
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if strings.Contains(conn.RemoteAddr().String(), "[") {
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level = syscall.IPPROTO_IPV6
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name = syscall.IPV6_UNICAST_HOPS
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}
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fi, err := conn.File()
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defer fi.Close()
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if err != nil {
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return err
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}
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if conn, err := net.FileConn(fi); err == nil {
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defer conn.Close()
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}
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(int(fi.Fd()), level, name, ttl))
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}
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