Your Name
305 Zeilen
7.7 KiB
Go
305 Zeilen
7.7 KiB
Go
package sshclient
|
||
|
||
import (
|
||
"bytes"
|
||
"fmt"
|
||
"net"
|
||
"os"
|
||
"strings"
|
||
"time"
|
||
"regexp"
|
||
|
||
"golang.org/x/crypto/ssh"
|
||
)
|
||
|
||
// Client SSH客户端
|
||
type Client struct {
|
||
client *ssh.Client
|
||
timeout time.Duration
|
||
host string
|
||
port int
|
||
username string
|
||
password string
|
||
keyFile string
|
||
insecureCiphers bool
|
||
}
|
||
|
||
// Config SSH客户端配置
|
||
type Config struct {
|
||
Host string
|
||
Port int
|
||
Username string
|
||
Password string
|
||
KeyFile string
|
||
Timeout time.Duration
|
||
InsecureCiphers bool // 启用不安全的加密算法(用于兼容老旧设备)
|
||
}
|
||
|
||
// NewClient 创建新的SSH客户端
|
||
func NewClient(config Config) *Client {
|
||
if config.Port == 0 {
|
||
config.Port = 22
|
||
}
|
||
if config.Timeout == 0 {
|
||
config.Timeout = 10 * time.Second
|
||
}
|
||
return &Client{
|
||
host: config.Host,
|
||
port: config.Port,
|
||
username: config.Username,
|
||
password: config.Password,
|
||
keyFile: config.KeyFile,
|
||
timeout: config.Timeout,
|
||
insecureCiphers: config.InsecureCiphers,
|
||
}
|
||
}
|
||
|
||
// Connect 连接到SSH服务器
|
||
func (c *Client) Connect() error {
|
||
config := &ssh.ClientConfig{
|
||
User: c.username,
|
||
Auth: []ssh.AuthMethod{},
|
||
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
|
||
Timeout: c.timeout,
|
||
}
|
||
|
||
// 添加密码认证
|
||
if c.password != "" {
|
||
config.Auth = append(config.Auth, ssh.Password(c.password))
|
||
}
|
||
|
||
// 添加密钥认证
|
||
if c.keyFile != "" {
|
||
key, err := loadPrivateKey(c.keyFile)
|
||
if err != nil {
|
||
return fmt.Errorf("failed to load private key: %w", err)
|
||
}
|
||
config.Auth = append(config.Auth, ssh.PublicKeys(key))
|
||
}
|
||
|
||
// 如果启用不安全加密算法,添加旧版算法支持(用于兼容老旧设备)
|
||
if c.insecureCiphers {
|
||
config.Ciphers = []string{
|
||
"aes128-ctr", "aes192-ctr", "aes256-ctr",
|
||
"aes128-gcm@openssh.com", "aes256-gcm@openssh.com",
|
||
"chacha20-poly1305@openssh.com",
|
||
"aes128-cbc", "aes256-cbc", // 旧版CBC算法
|
||
}
|
||
config.KeyExchanges = []string{
|
||
"curve25519-sha256", "curve25519-sha256@libssh.org",
|
||
"ecdh-sha2-nistp256", "ecdh-sha2-nistp384", "ecdh-sha2-nistp521",
|
||
"diffie-hellman-group14-sha256", "diffie-hellman-group16-sha512",
|
||
"diffie-hellman-group14-sha1", "diffie-hellman-group1-sha1", // 旧版KEX算法
|
||
}
|
||
config.MACs = []string{
|
||
"hmac-sha2-256-etm@openssh.com", "hmac-sha2-512-etm@openssh.com",
|
||
"hmac-sha2-256", "hmac-sha2-512",
|
||
"hmac-sha1", "hmac-sha1-96", // 旧版MAC算法
|
||
}
|
||
}
|
||
|
||
// 连接
|
||
addr := fmt.Sprintf("%s:%d", c.host, c.port)
|
||
client, err := ssh.Dial("tcp", addr, config)
|
||
if err != nil {
|
||
return fmt.Errorf("failed to connect to %s: %w", addr, err)
|
||
}
|
||
|
||
c.client = client
|
||
return nil
|
||
}
|
||
|
||
// Close 关闭SSH连接
|
||
func (c *Client) Close() error {
|
||
if c.client != nil {
|
||
return c.client.Close()
|
||
}
|
||
return nil
|
||
}
|
||
|
||
// ExecuteCommand 执行命令并返回输出
|
||
func (c *Client) ExecuteCommand(command string) (string, error) {
|
||
if c.client == nil {
|
||
return "", fmt.Errorf("not connected")
|
||
}
|
||
|
||
// 重试机制,处理会话创建失败的情况
|
||
var session *ssh.Session
|
||
var err error
|
||
maxRetries := 3
|
||
|
||
for i := 0; i < maxRetries; i++ {
|
||
session, err = c.client.NewSession()
|
||
if err == nil {
|
||
break
|
||
}
|
||
|
||
// 如果是会话拒绝错误,等待后重试
|
||
if i < maxRetries-1 {
|
||
time.Sleep(time.Duration(i+1) * 500 * time.Millisecond)
|
||
}
|
||
}
|
||
|
||
if err != nil {
|
||
return "", fmt.Errorf("failed to create session after %d retries: %w", maxRetries, err)
|
||
}
|
||
defer session.Close()
|
||
|
||
// H3C/华为设备需要先禁用分页
|
||
// 使用 Shell 模式而不是 Run 模式
|
||
modes := ssh.TerminalModes{
|
||
ssh.ECHO: 0, // 禁用回显
|
||
ssh.TTY_OP_ISPEED: 14400, // 输入速度
|
||
ssh.TTY_OP_OSPEED: 14400, // 输出速度
|
||
}
|
||
|
||
if err := session.RequestPty("dumb", 200, 1000, modes); err != nil {
|
||
return "", fmt.Errorf("failed to request pty: %w", err)
|
||
}
|
||
|
||
// 启动 shell
|
||
shell, err := session.StdinPipe()
|
||
if err != nil {
|
||
return "", fmt.Errorf("failed to get stdin pipe: %w", err)
|
||
}
|
||
|
||
var stdoutBuf bytes.Buffer
|
||
session.Stdout = &stdoutBuf
|
||
session.Stderr = &stdoutBuf
|
||
|
||
if err := session.Shell(); err != nil {
|
||
return "", fmt.Errorf("failed to start shell: %w", err)
|
||
}
|
||
|
||
// 先发送禁用分页命令（H3C/华为）
|
||
if _, err := shell.Write([]byte("screen-length disable\n")); err != nil {
|
||
return "", fmt.Errorf("failed to send screen-length disable: %w", err)
|
||
}
|
||
time.Sleep(500 * time.Millisecond) // 等待命令执行
|
||
|
||
// 发送实际命令
|
||
if _, err := shell.Write([]byte(command + "\n")); err != nil {
|
||
return "", fmt.Errorf("failed to send command: %w", err)
|
||
}
|
||
|
||
// 等待命令执行完成
|
||
time.Sleep(2 * time.Second)
|
||
if _, err := shell.Write([]byte("exit\n")); err != nil {
|
||
return "", fmt.Errorf("failed to send exit: %w", err)
|
||
}
|
||
|
||
// 等待会话结束
|
||
session.Wait()
|
||
|
||
output := stdoutBuf.String()
|
||
|
||
// 调试：输出原始输出长度和前100个字符
|
||
fmt.Printf("[SSH DEBUG] Raw output length: %d, first 100 chars: %q\n", len(output), output[:min(len(output), 100)])
|
||
|
||
// 清理输出：移除命令回显和分页提示
|
||
lines := strings.Split(output, "\n")
|
||
var cleanLines []string
|
||
skipNext := false
|
||
for _, line := range lines {
|
||
trimmedLine := strings.TrimSpace(line)
|
||
|
||
// 跳过空行
|
||
if trimmedLine == "" {
|
||
continue
|
||
}
|
||
|
||
// 跳过分页提示
|
||
if strings.Contains(trimmedLine, "---- More ----") {
|
||
continue
|
||
}
|
||
|
||
// 跳过命令本身的回显（精确匹配）
|
||
if trimmedLine == strings.TrimSpace(command) || trimmedLine == "screen-length disable" {
|
||
skipNext = true
|
||
fmt.Printf("[SSH DEBUG] Skipping command echo: %s\n", trimmedLine)
|
||
continue
|
||
}
|
||
|
||
// 跳过提示符行（如 <hostname> 或 [hostname]）
|
||
if regexp.MustCompile(`^[<\[]\S+[>\]]$`).MatchString(trimmedLine) {
|
||
fmt.Printf("[SSH DEBUG] Skipping prompt: %s\n", trimmedLine)
|
||
continue
|
||
}
|
||
|
||
// 如果是 "screen-length disable" 后的第一行（通常是提示符），跳过
|
||
if skipNext {
|
||
skipNext = false
|
||
fmt.Printf("[SSH DEBUG] Skipping line after command: %s\n", trimmedLine)
|
||
continue
|
||
}
|
||
|
||
cleanLines = append(cleanLines, trimmedLine)
|
||
}
|
||
|
||
cleanOutput := strings.Join(cleanLines, "\n")
|
||
fmt.Printf("[SSH DEBUG] Clean output length: %d, first 100 chars: %q\n", len(cleanOutput), cleanOutput[:min(len(cleanOutput), 100)])
|
||
|
||
return cleanOutput, nil
|
||
}
|
||
|
||
// ExecuteCommands 执行多个命令
|
||
func (c *Client) ExecuteCommands(commands []string) ([]string, error) {
|
||
results := make([]string, 0, len(commands))
|
||
for _, cmd := range commands {
|
||
result, err := c.ExecuteCommand(cmd)
|
||
if err != nil {
|
||
return results, fmt.Errorf("failed to execute command '%s': %w", cmd, err)
|
||
}
|
||
results = append(results, result)
|
||
}
|
||
return results, nil
|
||
}
|
||
|
||
// CheckSSH 检查主机是否开启SSH
|
||
func CheckSSH(host string, port int, timeout time.Duration) bool {
|
||
if port == 0 {
|
||
port = 22
|
||
}
|
||
if timeout == 0 {
|
||
timeout = 2 * time.Second
|
||
}
|
||
|
||
addr := fmt.Sprintf("%s:%d", host, port)
|
||
conn, err := net.DialTimeout("tcp", addr, timeout)
|
||
if err != nil {
|
||
return false
|
||
}
|
||
defer conn.Close()
|
||
return true
|
||
}
|
||
|
||
// loadPrivateKey 加载私钥文件
|
||
func loadPrivateKey(keyFile string) (ssh.Signer, error) {
|
||
keyData, err := os.ReadFile(keyFile)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("failed to read key file: %w", err)
|
||
}
|
||
|
||
signer, err := ssh.ParsePrivateKey(keyData)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("failed to parse private key: %w", err)
|
||
}
|
||
|
||
return signer, nil
|
||
}
|
||
|
||
// Ping 检查主机是否可达 (使用ICMP)
|
||
func Ping(host string, timeout time.Duration) bool {
|
||
// 简单的TCP ping,实际项目可以使用专门的ICMP库
|
||
ports := []int{22, 80, 443, 3389}
|
||
for _, port := range ports {
|
||
addr := fmt.Sprintf("%s:%d", host, port)
|
||
conn, err := net.DialTimeout("tcp", addr, timeout)
|
||
if err == nil {
|
||
conn.Close()
|
||
return true
|
||
}
|
||
}
|
||
return false
|
||
}
|