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net.go
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net.go
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package util
import (
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"strings"
"time"
"k8s.io/kubernetes/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", 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
}
// ListenAndServe starts a server that listens on the provided TCP mode (as supported
// by net.Listen)
func ListenAndServe(srv *http.Server, network string) error {
addr := srv.Addr
if addr == "" {
addr = ":http"
}
ln, err := net.Listen(network, addr)
if err != nil {
return err
}
return srv.Serve(tcpKeepAliveListener{ln.(*net.TCPListener)})
}
// 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
}
// TransportFor returns an http.Transport for the given ca and client cert (which may be empty strings)
func TransportFor(ca string, certFile string, keyFile string) (http.RoundTripper, error) {
if len(ca) == 0 && len(certFile) == 0 && len(keyFile) == 0 {
return http.DefaultTransport, nil
}
if (len(certFile) == 0) != (len(keyFile) == 0) {
return nil, errors.New("certFile and keyFile must be specified together")
}
// Copy default transport
transport := *http.DefaultTransport.(*http.Transport)
transport.TLSClientConfig = &tls.Config{}
if len(ca) != 0 {
roots, err := CertPoolFromFile(ca)
if err != nil {
return nil, fmt.Errorf("error loading cert pool from ca file %s: %v", ca, err)
}
transport.TLSClientConfig.RootCAs = roots
}
if len(certFile) != 0 {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return nil, fmt.Errorf("error loading x509 keypair from cert file %s and key file %s: %v", certFile, keyFile, err)
}
transport.TLSClientConfig.Certificates = []tls.Certificate{cert}
}
return &transport, nil
}
// 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)
}