1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
// 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 (
"net"
"syscall"
)
const (
tcpMD5SIG = 0x10 // TCP MD5 Signature (RFC2385)
ipv6MinHopCount = 73 // Generalized TTL Security Mechanism (RFC5082)
)
func setTcpMD5SigSockopt(l *net.TCPListener, address string, key string) error {
sc, err := l.SyscallConn()
if err != nil {
return err
}
// always enable and assumes that the configuration is done by setkey()
return setsockOptInt(sc, syscall.IPPROTO_TCP, tcpMD5SIG, 1)
}
func setListenTcpTTLSockopt(l *net.TCPListener, ttl int) error {
family := extractFamilyFromTCPListener(l)
sc, err := l.SyscallConn()
if err != nil {
return err
}
return setsockoptIpTtl(sc, family, ttl)
}
func setTcpTTLSockopt(conn *net.TCPConn, ttl int) error {
family := extractFamilyFromTCPConn(conn)
sc, err := conn.SyscallConn()
if err != nil {
return err
}
return setsockoptIpTtl(sc, family, ttl)
}
func setTcpMinTTLSockopt(conn *net.TCPConn, ttl int) error {
family := extractFamilyFromTCPConn(conn)
sc, err := conn.SyscallConn()
if err != nil {
return err
}
level := syscall.IPPROTO_IP
name := syscall.IP_MINTTL
if family == syscall.AF_INET6 {
level = syscall.IPPROTO_IPV6
name = ipv6MinHopCount
}
return setsockOptInt(sc, level, name, ttl)
}
|
