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package machine
import (
"bufio"
"fmt"
"io"
"os"
"os/exec"
"strconv"
"strings"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh"
)
// CommonSSH is a common function for ssh'ing to a podman machine using system-connections
// and a port
// TODO This should probably be taught about an machineconfig to reduce input
func CommonSSH(username, identityPath, name string, sshPort int, inputArgs []string) error {
return commonBuiltinSSH(username, identityPath, name, sshPort, inputArgs, true, os.Stdin)
}
func CommonSSHShell(username, identityPath, name string, sshPort int, inputArgs []string) error {
return commonNativeSSH(username, identityPath, name, sshPort, inputArgs, os.Stdin)
}
func CommonSSHSilent(username, identityPath, name string, sshPort int, inputArgs []string) error {
return commonBuiltinSSH(username, identityPath, name, sshPort, inputArgs, false, nil)
}
func CommonSSHWithStdin(username, identityPath, name string, sshPort int, inputArgs []string, stdin io.Reader) error {
return commonBuiltinSSH(username, identityPath, name, sshPort, inputArgs, true, stdin)
}
func commonBuiltinSSH(username, identityPath, name string, sshPort int, inputArgs []string, passOutput bool, stdin io.Reader) error {
config, err := createConfig(username, identityPath)
if err != nil {
return err
}
client, err := ssh.Dial("tcp", fmt.Sprintf("localhost:%d", sshPort), config)
if err != nil {
return err
}
defer client.Close()
session, err := client.NewSession()
if err != nil {
return err
}
defer session.Close()
cmd := strings.Join(inputArgs, " ")
logrus.Debugf("Running ssh command on machine %q: %s", name, cmd)
session.Stdin = stdin
if passOutput {
session.Stdout = os.Stdout
session.Stderr = os.Stderr
} else if logrus.IsLevelEnabled(logrus.DebugLevel) {
return runSessionWithDebug(session, cmd)
}
return session.Run(cmd)
}
func runSessionWithDebug(session *ssh.Session, cmd string) error {
outPipe, err := session.StdoutPipe()
if err != nil {
return err
}
errPipe, err := session.StderrPipe()
if err != nil {
return err
}
logOuput := func(pipe io.Reader, done chan struct{}) {
scanner := bufio.NewScanner(pipe)
for scanner.Scan() {
logrus.Debugf("ssh output: %s", scanner.Text())
}
done <- struct{}{}
}
if err := session.Start(cmd); err != nil {
return err
}
completed := make(chan struct{}, 2)
go logOuput(outPipe, completed)
go logOuput(errPipe, completed)
<-completed
<-completed
return session.Wait()
}
func createConfig(user string, identityPath string) (*ssh.ClientConfig, error) {
key, err := os.ReadFile(identityPath)
if err != nil {
return nil, err
}
signer, err := ssh.ParsePrivateKey(key)
if err != nil {
return nil, err
}
return &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}, nil
}
func commonNativeSSH(username, identityPath, name string, sshPort int, inputArgs []string, stdin io.Reader) error {
sshDestination := username + "@localhost"
port := strconv.Itoa(sshPort)
interactive := true
args := []string{"-i", identityPath, "-p", port, sshDestination,
"-o", "IdentitiesOnly=yes",
"-o", "StrictHostKeyChecking=no",
"-o", "UserKnownHostsFile=" + os.DevNull,
"-o", "CheckHostIP=no",
"-o", "LogLevel=ERROR", "-o", "SetEnv=LC_ALL="}
if len(inputArgs) > 0 {
interactive = false
args = append(args, inputArgs...)
} else {
// ensure we have a tty
args = append(args, "-t")
fmt.Printf("Connecting to vm %s. To close connection, use `~.` or `exit`\n", name)
}
cmd := exec.Command("ssh", args...)
logrus.Debugf("Executing: ssh %v\n", args)
if err := setupIOPassthrough(cmd, interactive, stdin); err != nil {
return err
}
return cmd.Run()
}
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