What is the use of php connecting to sftp?

sftp protocol

The protocol that uses the SSH protocol for FTP transmission is called SFTP (Secure File Transfer). Sftp and Ftp are both file transfer protocols.

Difference:

sftp is a protocol included in ssh (ssh is an encrypted telnet protocol), as long as the sshd server is started , it is available, and sftp has high security, It does not require the ftp server to be started. sftp = ssh ftp (Secure File Transfer Protocol). (Recommended learning: PHP programming from entry to proficiency)

Since ftp is transmitted in plain text, there is no security, while sftp is based on ssh, and the transmission content is encrypted , safer. The current network is not very secure. Those who used telnet in the past have switched to ssh2 (SSH1 has been cracked).

The sftp tool is used the same as ftp. However, its transmitted files are encrypted through SSL and cannot be cracked even if they are intercepted. Moreover, sftp has more functions than ftp, including some more file attribute settings

// 注意这里只是为了介绍ftp ,并没有做验证 ;      
class ftp{
     
    // 初始配置为NULL
    private $config =NULL ;
    // 连接为NULL 
    private $conn = NULL;
     
    public function init($config){
     $this->config = $config;    
    }
     
    // ftp 连接 
    public function connect(){
        return $this->conn = ftp_connect($this->config['host'],$this->config['port'])); 
    }
     
     
    // 传输数据 传输层协议,获得数据 true or false 
  public function download($remote, $local,$mode = 'auto'){
      return $result = @ftp_get($this->conn, $localpath, $remotepath, $mode);
  }
   
  // 传输数据 传输层协议,上传数据 true or false 
  public function upload($remote, $local,$mode = 'auto'){
      return $result = @ftp_put($this->conn, $localpath, $remotepath, $mode);
  }
   
   
     // 删除文件 
    public function remove($remote){
     return $result = @ftp_delete($this->conn_id, $file);
    }
   
     
}       
 
 
 
// 使用 
$config = array(
            'hostname' => 'localhost',
      'username' => 'root',
      'password' => 'root',
      'port' => 21
 
) ;
  
$ftp = new Ftp();
$ftp->connect($config);
$ftp->upload('ftp_err.log','ftp_upload.log');
$ftp->download('ftp_upload.log','ftp_download.log');
 
 
 
/*根据上面的三个协议写出基于ssh 的ftp 类
我们知道进行身份认证的方式有两种：公钥；密码 ;
(1) 使用密码登陆
(2) 免密码登陆也就是使用公钥登陆 
 
*/
 
class sftp{
     
     
    // 初始配置为NULL
    private $config =NULL ;
    // 连接为NULL 
    private $conn = NULL;
 
     
    // 是否使用秘钥登陆 
     private $use_pubkey_file= false;
     
    // 初始化
    public function init($config){
        $this->config = $config ; 
    }
     
     
    // 连接ssh ,连接有两种方式(1) 使用密码
    // (2) 使用秘钥 
    public function connect(){
         
        $methods['hostkey'] = $use_pubkey_file ? 'ssh-rsa' : [] ; 
        $con = ssh2_connect($this->config['host'], $this->config['port'], $methods);
        //(1) 使用秘钥的时候 
        if($use_pubkey_file){
        // 用户认证协议
             $rc = ssh2_auth_pubkey_file(
                $conn,
                $this->config['user'],
                $this->config['pubkey_file'],
                $this->config['privkey_file'],
                $this->config['passphrase']) 
            );
        //(2) 使用登陆用户名字和登陆密码
        }else{
            $rc = ssh2_auth_password( $conn, $this->conf_['user'],$this->conf_['passwd']);
       
        }
         
        return $rc ; 
    }
     
     
    // 传输数据 传输层协议,获得数据
      public function download($remote, $local){
           
          return ssh2_scp_recv($this->conn_, $remote, $local);
      }
       
     //传输数据 传输层协议,写入ftp服务器数据
     public function upload($remote, $local,$file_mode=0664){
          return ssh2_scp_send($this->conn_, $local, $remote, $file_mode);
           
     }
      
     // 删除文件 
      public function remove($remote){
            $sftp = ssh2_sftp($this->conn_);
            $rc  = false;
 
    if (is_dir("ssh2.sftp://{$sftp}/{$remote}")) {
            $rc = false ;
             
            // ssh 删除文件夹
      $rc = ssh2_sftp_rmdir($sftp, $remote);
            } else {
          // 删除文件
                $rc = ssh2_sftp_unlink($sftp, $remote);
            }
            return $rc;
             
        }
          
  
  
     
}
 
 
$config = [
  "host"     => "192.168.1.1 ",   // ftp地址
  "user"     => "***", 
  "port"     => "22",
  "pubkey_path" => "/root/.ssh/id_rsa.pub",  // 公钥的存储地址
  "privkey_path" => "/root/.ssh/id_rsa",     // 私钥的存储地址
];
 
$handle = new SftpAccess();
$handle->init($config);
$rc = $handle->connect();
$handle->getData(remote, $local);

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