# ssh2_connect

(PECL ssh2 >= 0.9.0)

ssh2_connect — Connect to an SSH server

### 说明

ssh2_connect ( string `$host` [, int `$port` = 22 [, array `$methods` [, array `$callbacks` ]]] ) : resource

Establish a connection to a remote SSH server.

Once connected, the client should verify the server's hostkey using ssh2_fingerprint(), then authenticate using either password or public key.

### 参数

`host`

`port`

`methods`

  `methods` may be an associative array with up to four parameters as described below.

  `methods` may be an associative array with any or all of the following parameters.
  Index | Meaning | Supported Values*
  --- | --- | ---
  kex | List of key exchange methods to advertise, comma separated in order of preference. | diffie-hellman-group1-sha1, diffie-hellman-group14-sha1, and diffie-hellman-group-exchange-sha1
  hostkey | List of hostkey methods to advertise, comma separated in order of preference. | ssh-rsa and ssh-dss
  client_to_server | Associative array containing crypt, compression, and message authentication code (MAC) method preferences for messages sent from client to server. |
  server_to_client | Associative array containing crypt, compression, and message authentication code (MAC) method preferences for messages sent from server to client. |

  * - Supported Values are dependent on methods supported by underlying library. See » libssh2 documentation for additional information.

  `client_to_server` and `server_to_client` may be an associative array with any or all of the following parameters.
  Index | Meaning | Supported Values*
  --- | --- | ---
  crypt | List of crypto methods to advertise, comma separated in order of preference. | rijndael-cbc@lysator.liu.se, aes256-cbc, aes192-cbc, aes128-cbc, 3des-cbc, blowfish-cbc, cast128-cbc, arcfour, and none**
  comp | List of compression methods to advertise, comma separated in order of preference. | zlib and none
  mac | List of MAC methods to advertise, comma separated in order of preference. | hmac-sha1, hmac-sha1-96, hmac-ripemd160, hmac-ripemd160@openssh.com, and none**

  > Note: Crypt and MAC method "none"

  > For security reasons, none is disabled by the underlying » libssh2 library unless explicitly enabled during build time by using the appropriate ./configure options. See documentation for the underlying library for more information.

`callbacks`

  `callbacks` may be an associative array with any or all of the following parameters.

  Callbacks parameters
  Index | Meaning | Prototype
  --- | --- | ---
  ignore | Name of function to call when an `SSH2_MSG_IGNORE` packet is received | void ignore_cb($message)
  debug | Name of function to call when an `SSH2_MSG_DEBUG` packet is received | void debug_cb($message, $language, $always_display)
  macerror | Name of function to call when a packet is received but the message authentication code failed. If the callback returns `TRUE`, the mismatch will be ignored, otherwise the connection will be terminated. | bool macerror_cb($packet)
  disconnect | Name of function to call when an `SSH2_MSG_DISCONNECT` packet is received | void disconnect_cb($reason, $message, $language)

### 返回值

Returns a resource on success, or `FALSE` on error.

### 范例

Example #1 ssh2_connect() example

Open a connection forcing 3des-cbc when sending packets, any strength aes cipher when receiving packets, no compression in either direction, and Group1 key exchange.

    <?php
    /* Notify the user if the server terminates the connection */
    function my_ssh_disconnect($reason, $message, $language) {
      printf("Server disconnected with reason code [%d] and message: %s\n",
             $reason, $message);
    }

    $methods = array(
      'kex' => 'diffie-hellman-group1-sha1',
      'client_to_server' => array(
        'crypt' => '3des-cbc',
        'comp' => 'none'),
      'server_to_client' => array(
        'crypt' => 'aes256-cbc,aes192-cbc,aes128-cbc',
        'comp' => 'none'));

    $callbacks = array('disconnect' => 'my_ssh_disconnect');

    $connection = ssh2_connect('shell.example.com', 22, $methods, $callbacks);
    if (!$connection) die('Connection failed');
    ?>

### 参见

- ssh2_fingerprint() - Retrieve fingerprint of remote server
- ssh2_auth_none() - Authenticate as "none"
- ssh2_auth_password() - Authenticate over SSH using a plain password
- ssh2_auth_pubkey_file() - Authenticate using a public key
- ssh2_disconnect() - Close a connection to a remote SSH server