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// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build dragonfly freebsd netbsd
package server
import (
"fmt"
"net"
"os"
"strings"
"syscall"
)
const (
TCP_MD5SIG = 0x10 // TCP MD5 Signature (RFC2385)
IPV6_MINHOPCOUNT = 73 // Generalized TTL Security Mechanism (RFC5082)
)
func SetTcpMD5SigSockopts(l *net.TCPListener, address string, key string) error {
fi, err := l.File()
defer fi.Close()
if err != nil {
return err
}
if l, err := net.FileListener(fi); err == nil {
defer l.Close()
}
// always enable and assumes that the configuration is done by
// setkey()
if err := syscall.SetsockoptInt(int(fi.Fd()),
syscall.IPPROTO_TCP, TCP_MD5SIG, 1); err != nil {
return err
}
return nil
}
func setTcpSockoptInt(conn *net.TCPConn, level int, name int, value int) error {
fi, err := conn.File()
defer fi.Close()
if err != nil {
return err
}
if conn, err := net.FileConn(fi); err == nil {
defer conn.Close()
}
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(int(fi.Fd()), level, name, value))
}
func SetTcpTTLSockopts(conn *net.TCPConn, ttl int) error {
level := syscall.IPPROTO_IP
name := syscall.IP_TTL
if strings.Contains(conn.RemoteAddr().String(), "[") {
level = syscall.IPPROTO_IPV6
name = syscall.IPV6_UNICAST_HOPS
}
return setTcpSockoptInt(conn, level, name, ttl)
}
func SetTcpMinTTLSockopts(conn *net.TCPConn, ttl int) error {
level := syscall.IPPROTO_IP
name := syscall.IP_MINTTL
if strings.Contains(conn.RemoteAddr().String(), "[") {
level = syscall.IPPROTO_IPV6
name = IPV6_MINHOPCOUNT
}
return setTcpSockoptInt(conn, level, name, ttl)
}
func DialTCPTimeoutWithMD5Sig(host string, port int, localAddr, key string, msec int) (*net.TCPConn, error) {
return nil, fmt.Errorf("md5 active connection unsupported")
}
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