74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package common
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import (
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"fmt"
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"github.com/mitchellh/multistep"
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"github.com/mitchellh/packer/packer"
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"log"
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"math/rand"
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"net"
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)
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// This step adds a NAT port forwarding definition so that SSH is available
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// on the guest machine.
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//
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// Uses:
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// driver Driver
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// ui packer.Ui
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// vmName string
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//
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// Produces:
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type StepForwardSSH struct {
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GuestPort uint
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HostPortMin uint
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HostPortMax uint
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}
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func (s *StepForwardSSH) Run(state multistep.StateBag) multistep.StepAction {
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driver := state.Get("driver").(Driver)
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ui := state.Get("ui").(packer.Ui)
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vmName := state.Get("vmName").(string)
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log.Printf("Looking for available SSH port between %d and %d",
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s.HostPortMin, s.HostPortMax)
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var sshHostPort uint
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var offset uint = 0
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portRange := int(s.HostPortMax - s.HostPortMin)
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if portRange > 0 {
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// Have to check if > 0 to avoid a panic
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offset = uint(rand.Intn(portRange))
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}
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for {
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sshHostPort = offset + s.HostPortMin
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log.Printf("Trying port: %d", sshHostPort)
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l, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", sshHostPort))
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if err == nil {
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defer l.Close()
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break
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}
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}
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// Create a forwarded port mapping to the VM
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ui.Say(fmt.Sprintf("Creating forwarded port mapping for SSH (host port %d)", sshHostPort))
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command := []string{
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"modifyvm", vmName,
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"--natpf1",
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fmt.Sprintf("packerssh,tcp,127.0.0.1,%d,,%d", sshHostPort, s.GuestPort),
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}
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if err := driver.VBoxManage(command...); err != nil {
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err := fmt.Errorf("Error creating port forwarding rule: %s", err)
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state.Put("error", err)
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ui.Error(err.Error())
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return multistep.ActionHalt
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}
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// Save the port we're using so that future steps can use it
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state.Put("sshHostPort", sshHostPort)
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return multistep.ActionContinue
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}
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func (s *StepForwardSSH) Cleanup(state multistep.StateBag) {}
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