ssh/client.go

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2018-10-30 17:45:30 +08:00
package ssh
import (
"errors"
"net"
"os"
"strconv"
"time"
"github.com/pkg/sftp"
"golang.org/x/crypto/ssh"
)
const DefaultTimeout = 30 * time.Second
type Client struct {
*Config
SSHClient *ssh.Client
SFTPClient *sftp.Client
}
// NewClient 根据配置
func NewClient(user, host, port, password string) (client *Client, err error) {
p, err := strconv.Atoi(port)
if err == nil || p == 0 {
p = 22
}
if user == "" {
user = "root"
}
var config = &Config{
User: user,
Host: host,
Port: p,
Password: password,
// KeyFiles: []string{"~/.ssh/id_rsa"},
}
return New(config)
}
// New 创建SSH client
func New(config *Config) (client *Client, err error) {
clientConfig := &ssh.ClientConfig{
User: config.User,
Timeout: DefaultTimeout,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
// 2. 密码方式
if config.Password != "" {
clientConfig.Auth = append(clientConfig.Auth, ssh.Password(config.Password))
}
// 3. privite key file
if len(config.KeyFiles) == 0 {
keyPath := os.Getenv("HOME") + "/.ssh/id_rsa"
if auth, err := WithPrivateKey(keyPath, config.Password); err != nil {
clientConfig.Auth = append(clientConfig.Auth, auth)
}
} else {
if auth, err := WithPrivateKeys(config.KeyFiles, config.Password); err != nil {
clientConfig.Auth = append(clientConfig.Auth, auth)
}
}
// 1. agent
if auth, err := WithAgent(); err != nil {
clientConfig.Auth = append(clientConfig.Auth, auth)
}
if config.Port == 0 {
config.Port = 22
}
// hostPort := config.Host + ":" + strconv.Itoa(config.Port)
sshClient, err := ssh.Dial("tcp", net.JoinHostPort(config.Host, strconv.Itoa(config.Port)), clientConfig)
if err != nil {
return client, errors.New("Failed to dial ssh: " + err.Error())
}
// create sftp client
var sftpClient *sftp.Client
if sftpClient, err = sftp.NewClient(sshClient); err != nil {
return client, errors.New("Failed to conn sftp: " + err.Error())
}
return &Client{SSHClient: sshClient, SFTPClient: sftpClient}, nil
}
// Execute cmd on the remote host and return stderr and stdout
func (c *Client) Exec(cmd string) ([]byte, error) {
session, err := c.SSHClient.NewSession()
if err != nil {
return nil, err
}
defer session.Close()
return session.CombinedOutput(cmd)
}
// Close the underlying SSH connection
func (c *Client) Close() {
c.SFTPClient.Close()
c.SSHClient.Close()
}
func addPortToHost(host string) string {
_, _, err := net.SplitHostPort(host)
// We got an error so blindly try to add a port number
if err != nil {
return net.JoinHostPort(host, "22")
}
return host
}