<?php

// ssh protocols
// note: once openShell method is used, cmdExec does not work

class ssh2
{

    private $use_pubkey_file = false;
    private $host = '192.168.5.108';
    private $user = 'Publisher';
    private $port = '22';
    private $password = 'Publisher';
    private $con = null;
    private $shell_type = 'xterm';
    private $shell = null;
    private $log = '';

    public function __construct($use_pubkey_file = false, $host = '', $port = '')
    {

        if ($host != '') {
            $this->host = $host;
        }

        if ($port != '') {
            $this->port = $port;
        }

        if ($use_pubkey_file != '') {
            $this->use_pubkey_file = $use_pubkey_file;
        }

        $methods = [];
        if ($this->use_pubkey_file) {
            // $methods['hostkey'] = 'ssh-rsa';
			$methods = array(
				'hostkey'=>'ssh-rsa,ssh-dss',
			//    'kex' => 'diffie-hellman-group-exchange-sha256',
				'client_to_server' => array(
					'crypt' => 'aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-cbc,blowfish-cbc',
					'comp' => 'none'),
				'server_to_client' => array(
					'crypt' => 'aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-cbc,blowfish-cbc',
					'comp' => 'none'));
        }
        // $this->con = ssh2_connect($this->host, $this->port);
        $this->con = ssh2_connect($this->host, $this->port, $methods);
        if (!$this->con) {
            $this->log .= "Connection failed !";
        }
    }

    public function authKey($pubkey_filePath, $privkey_file_filePath)
    {

        if ($pubkey_filePath == '') {
            return;
        }

        if ($privkey_file_filePath == '') {
            return;
        }

        $rc = ssh2_auth_pubkey_file($this->con, $this->user, $pubkey_filePath, $privkey_file_filePath);
        return;
    }

    public function authPassword($user = '', $password = '')
    {

        if ($user != '') {
            $this->user = $user;
        }

        if ($password != '') {
            $this->password = $password;
        }

        if (!ssh2_auth_password($this->con, $this->user, $this->password)) {
            $this->log .= "Authorization failed !";
        }
    }

    public function openShell($shell_type = '')
    {

        if ($shell_type != '') {
            $this->shell_type = $shell_type;
        }

        $this->shell = ssh2_shell($this->con, $this->shell_type);
        if (!$this->shell) {
            $this->log .= " Shell connection failed !";
        }

        stream_set_blocking($this->shell, true);
    }

    public function writeShell($command = '')
    {

        fwrite($this->shell, $command . "\n");
    }

    public function cmdExec()
    {

        $argc = func_num_args();
        $argv = func_get_args();

        $cmd = '';
        for ($i = 0; $i < $argc; $i++) {
            if ($i != ($argc - 1)) {
                $cmd .= $argv[$i] . " && ";
            } else {
                $cmd .= $argv[$i];
            }
        }
        echo $cmd;

        $stream = ssh2_exec($this->con, $cmd);
        stream_set_blocking($stream, true);
        return stream_get_contents($stream);
    }

    public function getLog()
    {
        return $this->log;
    }

    public function getResult()
    {
        $contents = '';
        while (!feof($this->shell)) {
            $contents .= fgets($this->shell);
        }
        return $contents;
    }
}