php(ssh2, tunnel), I can't connect my remote mysql server - php

Question

<?
$server_ip = "my ubuntu ip";
$server_port = "my ubuntu port";
$server_user = 'my id';
$user_pw = 'my pw';
$connection = ssh2_connect($server_ip, $server_port);
if (ssh2_auth_password($connection, $server_user, $user_pw)) {
echo "Authentication Successful!<br>";
} else {
echo "Authentication failed...";
}
$mysql_ip = '10.41.12.71';
$mysql_default_port = '3306';
$tunnel = ssh2_tunnel($connection,$mysql_ip,$mysql_default_port);
if($tunnel) {
echo "tunnel created<br>";
}else {
echo "tunnel creation failed";
die();
}
$mysql_user = 'root';
$mysql_user_pw = 'tkakcy159*';
$dbname = 'test';
// $dbconn = mysqli_connect($tunnel,$mysql_user,$mysql_user_pw,$dbname);
$dbconn = new mysqli($tunnel, $mysql_user, $mysql_user_pw, $dbname);
if ($dbconn) {
echo $dbname." connected<br>";
} else {
echo "DBConnection failed: " . $dbconn->connect_error;
}
// $insert_sql = " insert into test_table values('0001','wlsdhks0423'); ";
// $result = mysqli_query($dbconn,$insert_sql);
// if($result) {
// echo "data insert success<br>";
// }
// else {
// echo "data insert failed : ".mysqli_error($dbconn);
// }
$select_sql = " select * from test_table; ";
$result = mysqli_query($dbconn,$select_sql);
if($result) {
echo "selected rows : ".mysqli_num_rows($result)."<br>";
$row = mysqli_fetch_array($result);
$key = $row['test_key'];
$value = $row['test_value'];
echo "key = ".$key."<br>value = ".$value;
}else {
echo mysqli_error($dbconn);
}
// phpinfo();
?>
This is my code. mysql is on ubuntu device.
And I think I can access ubuntu, but mysql connection is failed
this php's output is
Authentication Successful!
tunnel created
test connected
and if i use this line
$dbconn = mysqli_connect($tunnel,$mysql_user,$mysql_user_pw,$dbname);
then output is
Authentication Successful!
tunnel created
DBConnection failed:
The obvious thing is that $connection and $tunnel has no problem.
I had tested them. And works well.

Answer 1

This is an exact duplicate of the postgresql question because they both exist for the same reason. You're both trying to connect a service over a SSH Tunnel by using ssh2_tunnel incorrectly.
ssh2_tunnel returns a resource aka a file pointer

Answer 2

The ssh2_tunnel() return a socket object which means you can operate this socket object just like you use standard socket function.
I have such code:
fwrite($ssh_tunnel, $db_password);
while (!feof($ssh_tunnel)) {
echo fgets($ssh_tunnel, 1280);
}
and I get such result:
a 5.5.5-10.3.34-MariaDB-cll-lve��=^Aile5x����}.hBNEM5_^:Gmysql_native_password!��#08S01Got packets out of order
I think fwrite can send something to such tunnel we have created, so I am currently figuring out what data should be sent to.