(PECL ssh2 >= 0.9.0)
ssh2_connect — Connect to an SSH server
$host
[, int $port = 22
[, array $methods
[, array $callbacks
]]] )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.
host
port
methods
methods may be an associative array with up to four parameters
as described below.
| 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.
| 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.
| 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, $language) |
Returns a resource on success, or FALSE on error.
Example #1 ssh2_connect() example
Open a connection forcing 3des-cbc when sending packets, any strength aes cipher when receiving packets, no compression in either direction, and Group1 key exchange.
<?php
/* Notify the user if the server terminates the connection */
function my_ssh_disconnect($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');
?>