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ssh.go
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ssh.go
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package cmd
import (
"fmt"
"net"
"os"
"os/exec"
"path"
"strings"
"time"
"github.com/kballard/go-shellquote"
"github.com/spf13/cobra"
"github.com/exoscale/cli/pkg/globalstate"
"github.com/exoscale/egoscale"
)
var sshCmd = &cobra.Command{
Use: "ssh INSTANCE-NAME|ID",
Short: "SSH into a Compute instance",
ValidArgsFunction: completeVMNames,
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) < 1 {
return cmd.Usage()
}
ipv6, err := cmd.Flags().GetBool("ipv6")
if err != nil {
return err
}
printInfo, err := cmd.Flags().GetBool("info")
if err != nil {
return err
}
printCmd, err := cmd.Flags().GetBool("print")
if err != nil {
return err
}
sshInfo, err := getSSHInfo(args[0], ipv6)
if err != nil {
return err
}
sshOpts, err := cmd.Flags().GetString("ssh-options")
if err != nil {
return err
}
sshInfo.opts = sshOpts
if printInfo {
printSSHInfo(sshInfo)
return nil
}
sshCmd := buildSSHCommand(sshInfo)
if printCmd {
fmt.Println(strings.Join(sshCmd, " "))
return nil
}
return connectSSH(sshCmd[1:])
},
PersistentPreRun: func(_ *cobra.Command, _ []string) {
fmt.Fprintln(os.Stderr,
`**********************************************************************
The "exo ssh" command is deprecated and will be removed in a future
version, please use "exo compute instance ssh" replacement command.
**********************************************************************`)
time.Sleep(3 * time.Second)
},
Hidden: true,
}
type sshInfo struct {
sshKeys string
username string
opts string
ip net.IP
vmName string
vmID *egoscale.UUID
}
func getSSHInfo(name string, isIpv6 bool) (*sshInfo, error) {
var info sshInfo
vm, err := getVirtualMachineByNameOrID(name)
if err != nil {
return nil, err
}
info.vmID = vm.ID
info.vmName = vm.Name
info.sshKeys = getKeyPairPath(vm.ID.String())
nic := vm.DefaultNic()
if nic == nil {
return nil, fmt.Errorf("this instance %q has no default NIC", vm.ID)
}
info.ip = *vm.IP()
if isIpv6 {
if nic.IP6Address == nil {
return nil, fmt.Errorf("missing IPv6 address on the instance %q", vm.ID)
}
info.ip = nic.IP6Address
}
if info.ip == nil {
return nil, fmt.Errorf("no valid IP address found")
}
query := &egoscale.Template{
ID: vm.TemplateID,
IsFeatured: true,
ZoneID: vm.ZoneID,
}
resp, err := globalstate.EgoscaleClient.GetWithContext(gContext, query)
if err != nil {
return nil, fmt.Errorf("unable to retrieve Compute instance template: %v", err)
}
template := resp.(*egoscale.Template)
username, ok := template.Details["username"]
if ok {
info.username = username
}
return &info, nil
}
func buildSSHCommand(info *sshInfo) []string {
cmd := []string{"ssh"}
if _, err := os.Stat(info.sshKeys); err == nil {
cmd = append(cmd, "-i", info.sshKeys)
}
if info.opts != "" {
opts, err := shellquote.Split(info.opts)
if err == nil {
cmd = append(cmd, opts...)
}
}
if info.username != "" {
cmd = append(cmd, "-l", info.username)
}
cmd = append(cmd, info.ip.String())
return cmd
}
func printSSHInfo(info *sshInfo) {
fmt.Println("Host", info.vmName)
fmt.Println("\tHostName", info.ip.String())
if info.username != "" {
fmt.Println("\tUser", info.username)
}
if _, err := os.Stat(info.sshKeys); err == nil {
fmt.Println("\tIdentityFile", info.sshKeys)
}
}
func connectSSH(args []string) error {
cmd := exec.Command("ssh", args...)
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
return cmd.Run()
}
func getInstanceSSHKeyPath(instanceID string) string {
return path.Join(gConfigFolder, "instances", instanceID, "id_rsa")
}
func init() {
sshCmd.Flags().BoolP("info", "i", false, "Print SSH config information")
sshCmd.Flags().StringP("ssh-options", "o", "",
"Additional options to pass to the `ssh` command (e.g. -o \"-l my-user -p 2222\"`)")
sshCmd.Flags().BoolP("print", "p", false, "Print SSH command")
sshCmd.Flags().BoolP("ipv6", "6", false, "Use IPv6 for SSH")
RootCmd.AddCommand(sshCmd)
}