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package main
import (
"errors"
"fmt"
"io"
"net"
"os"
"sync"
"github.com/spf13/cobra"
"github.com/lxc/incus/v6/internal/eagain"
internalUtil "github.com/lxc/incus/v6/internal/util"
"github.com/lxc/incus/v6/shared/util"
)
type cmdNetcat struct {
global *cmdGlobal
}
func (c *cmdNetcat) command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = "netcat <address> <name>"
cmd.Short = "Send stdin data to a unix socket"
cmd.Long = `Description:
Send stdin data to a unix socket
This internal command is used to forward the output of a program over
a websocket by first forwarding it to a unix socket controlled by the daemon.
Its main use is when running rsync or btrfs/zfs send/receive between
two machines over the websocket API.
`
cmd.RunE = c.run
cmd.Hidden = true
return cmd
}
func (c *cmdNetcat) run(cmd *cobra.Command, args []string) error {
// Quick checks.
if len(args) < 2 {
_ = cmd.Help()
if len(args) == 0 {
return nil
}
return errors.New("Missing required arguments")
}
// Only root should run this
if os.Geteuid() != 0 {
return errors.New("This must be run as root")
}
logPath := internalUtil.LogPath(args[1], "netcat.log")
if util.PathExists(logPath) {
_ = os.Remove(logPath)
}
logFile, logErr := os.OpenFile(logPath, os.O_WRONLY|os.O_CREATE|os.O_SYNC, 0o644)
if logErr == nil {
defer func() { _ = logFile.Close() }()
}
uAddr, err := net.ResolveUnixAddr("unix", args[0])
if err != nil {
if logErr == nil {
_, _ = logFile.WriteString(fmt.Sprintf("Could not resolve unix domain socket \"%s\": %s\n", args[0], err))
}
return err
}
conn, err := net.DialUnix("unix", nil, uAddr)
if err != nil {
if logErr == nil {
_, _ = logFile.WriteString(fmt.Sprintf("Could not dial unix domain socket \"%s\": %s\n", args[0], err))
}
return err
}
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
_, err := io.Copy(eagain.Writer{Writer: os.Stdout}, eagain.Reader{Reader: conn})
if err != nil && logErr == nil {
_, _ = logFile.WriteString(fmt.Sprintf("Error while copying from stdout to unix domain socket \"%s\": %s\n", args[0], err))
}
_ = conn.Close()
wg.Done()
}()
go func() {
_, err := io.Copy(eagain.Writer{Writer: conn}, eagain.Reader{Reader: os.Stdin})
if err != nil && logErr == nil {
_, _ = logFile.WriteString(fmt.Sprintf("Error while copying from unix domain socket \"%s\" to stdin: %s\n", args[0], err))
}
}()
wg.Wait()
return nil
}
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