forked from mistifyio/go-zfs
/
sshutils.go
109 lines (92 loc) · 1.86 KB
/
sshutils.go
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package zfs
import (
"fmt"
"strings"
"golang.org/x/crypto/ssh"
"io/ioutil"
)
func (cmd *command) StartCommand() (error, *ssh.Session) {
var (
session *ssh.Session
err error
)
z := cmd.zh
// open ssh link
if (z.client == nil) {
if err = z.dialSSH(); err != nil {
return err, nil
}
}
// establish ssh session
if session, err = z.client.NewSession(); err != nil {
return err, nil
}
// setup env, stdin, stdout, stderr
if err = prepareCommand(session, cmd); err != nil {
return err, nil
}
// start remote command
err = session.Start(cmd.Path)
if err == nil {
return err, session
}
return err, nil
}
func prepareCommand(session *ssh.Session, cmd *command) error {
for _, env := range cmd.Env {
variable := strings.Split(env, "=")
if len(variable) != 2 {
continue
}
if err := session.Setenv(variable[0], variable[1]); err != nil {
return err
}
}
if cmd.Stdout == nil {
session.Stdout = &cmd.stdout
} else {
session.Stdout = cmd.Stdout
}
if cmd.Stdin != nil {
session.Stdin = cmd.Stdin
}
if cmd.Stderr == nil {
session.Stderr = &cmd.stderr
} else {
session.Stderr = cmd.Stderr
}
return nil
}
func getKeyFile(keyfile string) (key ssh.Signer, err error) {
buf, err := ioutil.ReadFile(keyfile)
if err != nil {
return
}
key, err = ssh.ParsePrivateKey(buf)
if err != nil {
return
}
return
}
func (z *ZfsH) dialSSH() error {
// keyfile authentifcation
key, err := getKeyFile(z.keyfile);
if err != nil {
panic(err)
}
sshConfig := &ssh.ClientConfig{
User: z.username,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(key),
},
}
// password authentication
if z.password != "" {
sshConfig.Auth = append(sshConfig.Auth, ssh.Password(z.password))
}
z.client, err = ssh.Dial("tcp", fmt.Sprintf("%s:%d", z.host, z.port), sshConfig)
if err != nil {
return fmt.Errorf("Failed to dial: %s", err)
}
return nil
}