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client.go
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client.go
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package ssh
import (
"fmt"
"io/ioutil"
"strings"
"time"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh"
)
const Timeout = 5 * time.Second
type Client struct {
addr string
inner *ssh.Client
}
func Connect(host string, port uint, user, sshKeyPath string) (*Client, error) {
buffer, err := ioutil.ReadFile(sshKeyPath)
if err != nil {
return nil, err
}
signer, err := ssh.ParsePrivateKey(buffer)
if err != nil {
return nil, err
}
certAuth := ssh.PublicKeys(signer)
config := &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{certAuth},
Timeout: Timeout,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
sockAddr := fmt.Sprintf("%s:%d", host, port)
client, err := ssh.Dial("tcp", sockAddr, config)
if err != nil {
return nil, errors.Wrap(err, "failed to dial host")
}
return &Client{addr: host, inner: client}, nil
}
func (c *Client) RemoteAddr() string {
return c.addr
}
func (c *Client) ExecuteCmd(cmd string) (string, error) {
session, err := c.inner.NewSession()
if err != nil {
return "", errors.Wrap(err, "failed to create new session")
}
defer session.Close()
buffer, err := session.CombinedOutput(cmd)
output := string(buffer)
if err != nil {
return "", errors.Wrapf(err, "failed to run remote command: %s", output)
}
return strings.TrimSpace(output), nil
}