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fdforward.go
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fdforward.go
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// Copyright 2014 CoreOS, Inc.
//
// 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.
package main
import (
"io"
"net"
"os"
"github.com/spf13/cobra"
)
var cmdFDForward = &cobra.Command{
Use: "fd-forward SOCKET",
Short: "Proxy stdin and stdout to a unix domain socket",
Long: `fleetctl utilizes fd-forward when --tunnel is used and --endpoint is a unix socket. This command is not intended to be called by users directly.`,
Run: runWrapper(runFDForward),
}
func init() {
cmdFleet.AddCommand(cmdFDForward)
}
func runFDForward(cCmd *cobra.Command, args []string) (exit int) {
if len(args) != 1 {
stderr("Provide a single argument")
return 1
}
to := args[0]
raddr, err := net.ResolveUnixAddr("unix", to)
if err != nil {
stderr("Unable to use %q as unix address: %v", to, err)
return 1
}
sock, err := net.DialUnix("unix", nil, raddr)
if err != nil {
stderr("Failed dialing remote address: %v", err)
return
}
defer sock.Close()
errchan := make(chan error)
go cp(os.Stdout, sock, errchan)
go cp(sock, os.Stdin, errchan)
select {
case err := <-errchan:
if err != nil {
stderr("Encountered error during copy: %v", err)
return 1
}
}
return
}
func cp(to io.Writer, from io.Reader, errchan chan error) {
_, err := io.Copy(to, from)
errchan <- err
}