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package main
import (
"fmt"
"io"
"net"
"os"
"sync"
"github.com/spf13/cobra"
"github.com/canonical/lxd/shared/eagain"
)
type cmdNetcat struct {
global *cmdGlobal
}
func (c *cmdNetcat) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = "netcat <address>"
cmd.Short = "Sends stdin data to a unix socket"
cmd.RunE = c.Run
cmd.Hidden = true
return cmd
}
func (c *cmdNetcat) Run(cmd *cobra.Command, args []string) error {
// Help and usage
if len(args) == 0 {
_ = cmd.Help()
return nil
}
// Handle mandatory arguments
if len(args) != 1 {
_ = cmd.Help()
return fmt.Errorf("Missing required argument")
}
// Connect to the provided address
uAddr, err := net.ResolveUnixAddr("unix", args[0])
if err != nil {
return err
}
conn, err := net.DialUnix("unix", nil, uAddr)
if err != nil {
return err
}
// We'll wait until we're done reading from the socket
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer func() { _ = conn.Close() }()
defer wg.Done()
_, _ = io.Copy(eagain.Writer{Writer: os.Stdout}, eagain.Reader{Reader: conn})
}()
go func() {
_, _ = io.Copy(eagain.Writer{Writer: conn}, eagain.Reader{Reader: os.Stdin})
}()
// Wait
wg.Wait()
return nil
}
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