-
Notifications
You must be signed in to change notification settings - Fork 4.7k
/
net.go
150 lines (133 loc) · 4.14 KB
/
net.go
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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
package util
import (
"crypto/tls"
"net"
"net/http"
"strings"
"time"
"k8s.io/apimachinery/pkg/util/sets"
"github.com/golang/glog"
)
// TryListen tries to open a connection on the given port and returns true if it succeeded.
func TryListen(network, hostPort string) (bool, error) {
l, err := net.Listen(network, hostPort)
if err != nil {
glog.V(5).Infof("Failure while checking listen on %s: %v", hostPort, err)
return false, err
}
defer l.Close()
return true, nil
}
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
// connections. It's used by ListenAndServe and ListenAndServeTLS so
// dead TCP connections (e.g. closing laptop mid-download) eventually
// go away.
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
// ListenAndServeTLS starts a server that listens on the provided TCP mode (as supported
// by net.Listen).
func ListenAndServeTLS(srv *http.Server, network string, certFile, keyFile string) error {
addr := srv.Addr
if addr == "" {
addr = ":https"
}
config := &tls.Config{}
if srv.TLSConfig != nil {
config = srv.TLSConfig
}
if config.NextProtos == nil {
config.NextProtos = []string{"http/1.1"}
}
var err error
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return err
}
ln, err := net.Listen(network, addr)
if err != nil {
return err
}
tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, config)
return srv.Serve(tlsListener)
}
// WaitForSuccessfulDial attempts to connect to the given address, closing and returning nil on the first successful connection.
func WaitForSuccessfulDial(https bool, network, address string, timeout, interval time.Duration, retries int) error {
var (
conn net.Conn
err error
)
for i := 0; i <= retries; i++ {
dialer := net.Dialer{Timeout: timeout}
if https {
conn, err = tls.DialWithDialer(&dialer, network, address, &tls.Config{InsecureSkipVerify: true})
} else {
conn, err = dialer.Dial(network, address)
}
if err != nil {
glog.V(5).Infof("Got error %#v, trying again: %#v\n", err, address)
time.Sleep(interval)
continue
}
conn.Close()
return nil
}
return err
}
// GetCertificateFunc returns a function that can be used in tls.Config#GetCertificate
// Returns nil if len(certs) == 0
func GetCertificateFunc(certs map[string]*tls.Certificate) func(*tls.ClientHelloInfo) (*tls.Certificate, error) {
if len(certs) == 0 {
return nil
}
// Replica of tls.Config#getCertificate logic
return func(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
if clientHello == nil {
return nil, nil
}
name := clientHello.ServerName
name = strings.ToLower(name)
name = strings.TrimRight(name, ".")
for _, candidate := range HostnameMatchSpecCandidates(name) {
if cert, ok := certs[candidate]; ok {
return cert, nil
}
}
return nil, nil
}
}
// HostnameMatchSpecCandidates returns a list of match specs that would match the provided hostname
// Returns nil if len(hostname) == 0
func HostnameMatchSpecCandidates(hostname string) []string {
if len(hostname) == 0 {
return nil
}
// Exact match has priority
candidates := []string{hostname}
// Replace successive labels in the name with wildcards, to require an exact match on number of
// path segments, because certificates cannot wildcard multiple levels of subdomains
//
// This is primarily to be consistent with tls.Config#getCertificate implementation
//
// It using a cert signed for *.foo.example.com and *.bar.example.com by specifying the name *.*.example.com
labels := strings.Split(hostname, ".")
for i := range labels {
labels[i] = "*"
candidates = append(candidates, strings.Join(labels, "."))
}
return candidates
}
// HostnameMatches returns true if the given hostname is matched by the given matchSpec
func HostnameMatches(hostname string, matchSpec string) bool {
return sets.NewString(HostnameMatchSpecCandidates(hostname)...).Has(matchSpec)
}