/usr/share/gocode/src/github.com/lxc/lxd/shared/network.go is in golang-github-lxc-lxd-dev 2.0.2-0ubuntu1~16.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"io/ioutil"
"net"
"time"
"github.com/gorilla/websocket"
)
func RFC3493Dialer(network, address string) (net.Conn, error) {
host, port, err := net.SplitHostPort(address)
if err != nil {
return nil, err
}
addrs, err := net.LookupHost(host)
if err != nil {
return nil, err
}
for _, a := range addrs {
c, err := net.DialTimeout(network, net.JoinHostPort(a, port), 10*time.Second)
if err != nil {
continue
}
return c, err
}
return nil, fmt.Errorf("Unable to connect to: " + address)
}
func initTLSConfig() *tls.Config {
return &tls.Config{
MinVersion: tls.VersionTLS12,
MaxVersion: tls.VersionTLS12,
CipherSuites: []uint16{
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256},
PreferServerCipherSuites: true,
}
}
func finalizeTLSConfig(tlsConfig *tls.Config, tlsRemoteCert *x509.Certificate) {
// Trusted certificates
if tlsRemoteCert != nil {
caCertPool := x509.NewCertPool()
// Make it a valid RootCA
tlsRemoteCert.IsCA = true
tlsRemoteCert.KeyUsage = x509.KeyUsageCertSign
// Setup the pool
caCertPool.AddCert(tlsRemoteCert)
tlsConfig.RootCAs = caCertPool
// Set the ServerName
if tlsRemoteCert.DNSNames != nil {
tlsConfig.ServerName = tlsRemoteCert.DNSNames[0]
}
}
tlsConfig.BuildNameToCertificate()
}
func GetTLSConfig(tlsClientCertFile string, tlsClientKeyFile string, tlsRemoteCert *x509.Certificate) (*tls.Config, error) {
tlsConfig := initTLSConfig()
// Client authentication
if tlsClientCertFile != "" && tlsClientKeyFile != "" {
cert, err := tls.LoadX509KeyPair(tlsClientCertFile, tlsClientKeyFile)
if err != nil {
return nil, err
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
finalizeTLSConfig(tlsConfig, tlsRemoteCert)
return tlsConfig, nil
}
func GetTLSConfigMem(tlsClientCert string, tlsClientKey string, tlsRemoteCertPEM string) (*tls.Config, error) {
tlsConfig := initTLSConfig()
// Client authentication
if tlsClientCert != "" && tlsClientKey != "" {
cert, err := tls.X509KeyPair([]byte(tlsClientCert), []byte(tlsClientKey))
if err != nil {
return nil, err
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
var tlsRemoteCert *x509.Certificate
if tlsRemoteCertPEM != "" {
// Ignore any content outside of the PEM bytes we care about
certBlock, _ := pem.Decode([]byte(tlsRemoteCertPEM))
var err error
tlsRemoteCert, err = x509.ParseCertificate(certBlock.Bytes)
if err != nil {
return nil, err
}
}
finalizeTLSConfig(tlsConfig, tlsRemoteCert)
return tlsConfig, nil
}
func IsLoopback(iface *net.Interface) bool {
return int(iface.Flags&net.FlagLoopback) > 0
}
func WebsocketSendStream(conn *websocket.Conn, r io.Reader) chan bool {
ch := make(chan bool)
if r == nil {
close(ch)
return ch
}
go func(conn *websocket.Conn, r io.Reader) {
in := ReaderToChannel(r)
for {
buf, ok := <-in
if !ok {
break
}
w, err := conn.NextWriter(websocket.BinaryMessage)
if err != nil {
Debugf("Got error getting next writer %s", err)
break
}
_, err = w.Write(buf)
w.Close()
if err != nil {
Debugf("Got err writing %s", err)
break
}
}
conn.WriteMessage(websocket.TextMessage, []byte{})
ch <- true
}(conn, r)
return ch
}
func WebsocketRecvStream(w io.WriteCloser, conn *websocket.Conn) chan bool {
ch := make(chan bool)
go func(w io.WriteCloser, conn *websocket.Conn) {
for {
mt, r, err := conn.NextReader()
if mt == websocket.CloseMessage {
Debugf("Got close message for reader")
break
}
if mt == websocket.TextMessage {
Debugf("got message barrier")
break
}
if err != nil {
Debugf("Got error getting next reader %s, %s", err, w)
break
}
buf, err := ioutil.ReadAll(r)
if err != nil {
Debugf("Got error writing to writer %s", err)
break
}
if w == nil {
continue
}
i, err := w.Write(buf)
if i != len(buf) {
Debugf("Didn't write all of buf")
break
}
if err != nil {
Debugf("Error writing buf %s", err)
break
}
}
ch <- true
}(w, conn)
return ch
}
// WebsocketMirror allows mirroring a reader to a websocket and taking the
// result and writing it to a writer. This function allows for multiple
// mirrorings and correctly negotiates stream endings. However, it means any
// websocket.Conns passed to it are live when it returns, and must be closed
// explicitly.
func WebsocketMirror(conn *websocket.Conn, w io.WriteCloser, r io.ReadCloser) (chan bool, chan bool) {
readDone := make(chan bool, 1)
writeDone := make(chan bool, 1)
go func(conn *websocket.Conn, w io.WriteCloser) {
for {
mt, r, err := conn.NextReader()
if err != nil {
Debugf("Got error getting next reader %s, %s", err, w)
break
}
if mt == websocket.CloseMessage {
Debugf("Got close message for reader")
break
}
if mt == websocket.TextMessage {
Debugf("Got message barrier, resetting stream")
break
}
buf, err := ioutil.ReadAll(r)
if err != nil {
Debugf("Got error writing to writer %s", err)
break
}
i, err := w.Write(buf)
if i != len(buf) {
Debugf("Didn't write all of buf")
break
}
if err != nil {
Debugf("Error writing buf %s", err)
break
}
}
writeDone <- true
w.Close()
}(conn, w)
go func(conn *websocket.Conn, r io.ReadCloser) {
in := ReaderToChannel(r)
for {
buf, ok := <-in
if !ok {
readDone <- true
r.Close()
Debugf("sending write barrier")
conn.WriteMessage(websocket.TextMessage, []byte{})
return
}
w, err := conn.NextWriter(websocket.BinaryMessage)
if err != nil {
Debugf("Got error getting next writer %s", err)
break
}
_, err = w.Write(buf)
w.Close()
if err != nil {
Debugf("Got err writing %s", err)
break
}
}
closeMsg := websocket.FormatCloseMessage(websocket.CloseNormalClosure, "")
conn.WriteMessage(websocket.CloseMessage, closeMsg)
readDone <- true
r.Close()
}(conn, r)
return readDone, writeDone
}
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