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package common
import (
"context"
"fmt"
"log"
"math/rand"
"net"
"github.com/hashicorp/packer/helper/communicator"
"github.com/hashicorp/packer/helper/multistep"
"github.com/hashicorp/packer/packer"
)
// This step adds a NAT port forwarding definition so that SSH is available
// on the guest machine.
//
// Uses:
// driver Driver
// ui packer.Ui
// vmName string
//
// Produces:
type StepForwardSSH struct {
CommConfig *communicator.Config
HostPortMin uint
HostPortMax uint
SkipNatMapping bool
}
func (s *StepForwardSSH) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
driver := state.Get("driver").(Driver)
ui := state.Get("ui").(packer.Ui)
vmName := state.Get("vmName").(string)
if s.CommConfig.Type == "none" {
log.Printf("Not using a communicator, skipping setting up port forwarding...")
state.Put("sshHostPort", 0)
return multistep.ActionContinue
}
guestPort := s.CommConfig.Port()
sshHostPort := guestPort
if !s.SkipNatMapping {
log.Printf("Looking for available communicator (SSH, WinRM, etc) port between %d and %d",
s.HostPortMin, s.HostPortMax)
portRange := int(s.HostPortMax - s.HostPortMin + 1)
offset := rand.Intn(portRange)
for {
sshHostPort = offset + int(s.HostPortMin)
log.Printf("Trying port: %d", sshHostPort)
l, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", sshHostPort))
if err == nil {
defer l.Close()
break
}
offset++
if offset == portRange {
offset = 0
}
}
// Create a forwarded port mapping to the VM
ui.Say(fmt.Sprintf("Creating forwarded port mapping for communicator (SSH, WinRM, etc) (host port %d)", sshHostPort))
command := []string{
"modifyvm", vmName,
"--natpf1",
fmt.Sprintf("packercomm,tcp,127.0.0.1,%d,,%d", sshHostPort, guestPort),
}
if err := driver.VBoxManage(command...); err != nil {
err := fmt.Errorf("Error creating port forwarding rule: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
}
// Save the port we're using so that future steps can use it
state.Put("sshHostPort", sshHostPort)
return multistep.ActionContinue
}
func (s *StepForwardSSH) Cleanup(state multistep.StateBag) {}
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