func getTunnelClient(driverEndpoint string, tunnelEndpoint string, maxRetries int) (client.API, error) {
log.Printf("Using Fleet Tunnel connection for requests")
getSSHClient := func() (interface{}, error) {
return ssh.NewSSHClient("core", driverEndpoint, nil, false, defaultTimeout)
}
result, err := retry(getSSHClient, maxRetries)
if err != nil {
return nil, err
}
sshClient := result.(*ssh.SSHForwardingClient)
dial := func(string, string) (net.Conn, error) {
cmd := fmt.Sprintf("fleetctl fd-forward %s", tunnelEndpoint)
return ssh.DialCommand(sshClient, cmd)
}
// This is needed to fake out the client - it isn't used
// since we're overloading the dial method on the transport
// but the client complains if it isn't set
fakeHTTPEndpoint, err := url.Parse("http://domain-sock")
if err != nil {
return nil, err
}
trans := pkg.LoggingHTTPTransport{
Transport: http.Transport{
Dial: dial,
},
}
httpClient := http.Client{
Transport: &trans,
}
return client.NewHTTPClient(&httpClient, *fakeHTTPEndpoint)
}
// getAPI returns an API to Fleet.
func getAPI(hostAddr string, maxRetries int) (client.API, error) {
if hostAddr == "" {
return nullAPI{}, nil
}
getSSHClient := func() (interface{}, error) {
return ssh.NewSSHClient("core", hostAddr, nil, false, time.Second*10)
}
result, err := retry(getSSHClient, maxRetries)
if err != nil {
return nil, err
}
sshClient := result.(*ssh.SSHForwardingClient)
dial := func(string, string) (net.Conn, error) {
cmd := "fleetctl fd-forward /var/run/fleet.sock"
return ssh.DialCommand(sshClient, cmd)
}
trans := pkg.LoggingHTTPTransport{
Transport: http.Transport{
Dial: dial,
},
}
httpClient := http.Client{
Transport: &trans,
}
// since dial() ignores the endpoint, we just need something here that
// won't make the HTTP client complain.
endpoint, err := url.Parse("http://domain-sock")
return client.NewHTTPClient(&httpClient, *endpoint)
}
func getHTTPClient() (client.API, error) {
endpoints := strings.Split(globalFlags.Endpoint, ",")
if len(endpoints) > 1 {
log.Warningf("multiple endpoints provided but only the first (%s) is used", endpoints[0])
}
ep, err := url.Parse(endpoints[0])
if err != nil {
return nil, err
}
if len(ep.Scheme) == 0 {
return nil, errors.New("URL scheme undefined")
}
tun := getTunnelFlag()
tunneling := tun != ""
dialUnix := ep.Scheme == "unix" || ep.Scheme == "file"
tunnelFunc := net.Dial
if tunneling {
sshClient, err := ssh.NewSSHClient(globalFlags.SSHUserName, tun, getChecker(), true, getSSHTimeoutFlag())
if err != nil {
return nil, fmt.Errorf("failed initializing SSH client: %v", err)
}
if dialUnix {
tgt := ep.Path
tunnelFunc = func(string, string) (net.Conn, error) {
log.Debugf("Establishing remote fleetctl proxy to %s", tgt)
cmd := fmt.Sprintf(`fleetctl fd-forward %s`, tgt)
return ssh.DialCommand(sshClient, cmd)
}
} else {
tunnelFunc = sshClient.Dial
}
}
dialFunc := tunnelFunc
if dialUnix {
// This commonly happens if the user misses the leading slash after the scheme.
// For example, "unix://var/run/fleet.sock" would be parsed as host "var".
if len(ep.Host) > 0 {
return nil, fmt.Errorf("unable to connect to host %q with scheme %q", ep.Host, ep.Scheme)
}
// The Path field is only used for dialing and should not be used when
// building any further HTTP requests.
sockPath := ep.Path
ep.Path = ""
// If not tunneling to the unix socket, http.Client will dial it directly.
// http.Client does not natively support dialing a unix domain socket, so the
// dial function must be overridden.
if !tunneling {
dialFunc = func(string, string) (net.Conn, error) {
return net.Dial("unix", sockPath)
}
}
// http.Client doesn't support the schemes "unix" or "file", but it
// is safe to use "http" as dialFunc ignores it anyway.
ep.Scheme = "http"
// The Host field is not used for dialing, but will be exposed in debug logs.
ep.Host = "domain-sock"
}
tlsConfig, err := pkg.ReadTLSConfigFiles(globalFlags.CAFile, globalFlags.CertFile, globalFlags.KeyFile)
if err != nil {
return nil, err
}
trans := pkg.LoggingHTTPTransport{
Transport: http.Transport{
Dial: dialFunc,
TLSClientConfig: tlsConfig,
},
}
hc := http.Client{
Transport: &trans,
}
return client.NewHTTPClient(&hc, *ep)
}
