github.com/pwn-term/docker@v0.0.0-20210616085119-6e977cce2565/libnetwork/portmapper/proxy_linux.go (about)

     1  package portmapper
     2  
     3  import (
     4  	"net"
     5  	"os/exec"
     6  	"strconv"
     7  	"syscall"
     8  )
     9  
    10  func newProxyCommand(proto string, hostIP net.IP, hostPort int, containerIP net.IP, containerPort int, proxyPath string) (userlandProxy, error) {
    11  	path := proxyPath
    12  	if proxyPath == "" {
    13  		cmd, err := exec.LookPath(userlandProxyCommandName)
    14  		if err != nil {
    15  			return nil, err
    16  		}
    17  		path = cmd
    18  	}
    19  
    20  	args := []string{
    21  		path,
    22  		"-proto", proto,
    23  		"-host-ip", hostIP.String(),
    24  		"-host-port", strconv.Itoa(hostPort),
    25  		"-container-ip", containerIP.String(),
    26  		"-container-port", strconv.Itoa(containerPort),
    27  	}
    28  
    29  	return &proxyCommand{
    30  		cmd: &exec.Cmd{
    31  			Path: path,
    32  			Args: args,
    33  			SysProcAttr: &syscall.SysProcAttr{
    34  				Pdeathsig: syscall.SIGTERM, // send a sigterm to the proxy if the daemon process dies
    35  			},
    36  		},
    37  	}, nil
    38  }