干掉ssh同一用户多个登录脚本

gistfile1.txt

#!/usr/local/bin/php
<?php
kickearlyuser();

function kickearlyuser() {
        $usernames = array();
        $pids = array();
        $um = new shell();
        $res = $um->ps('sshd:');
        foreach ($res as $row) {
                $arr = explode(' ', $row);
                //整理
                $cnt = count($arr);
                $new_arr = array();
                for ($i = 0; $i < $cnt; $i++) {
                        if (!empty($arr[$i])) {
                                $new_arr[] = $arr[$i];
                        }
                }
                //搜索sshd
                $index = array_search('sshd:', $new_arr);
                //ps进程去掉
                if ($index == count($new_arr) - 1) {
                        continue;
                }
                //root@pts/1这样的
                $pos = strpos($new_arr[$index + 1], '@');
                if ($pos === false) {
                        $len = 300;
                } else {
                        $len = $pos;
                }
                $username = substr($new_arr[$index + 1], 0, $len);
                //不处理root
                if ($username == 'root')
                        continue;
                //只要存在的就比较pid大小，把小的干掉！
                $k = array_search($username, $usernames);
                if ($k === false) {
                        $usernames[] = $username;
                        $pids[] = $new_arr[1];
                } else {
                        if ($new_arr[1] > $pids[$k]) {
                                $t = $pids[$k];
                                $usernames[$k] = $username;
                                $pids[$k] = $new_arr[1];
                                $um->kill($t);
                        } else {
                                $um->kill($new_arr[1]);
                        }
                }
        }
}
class shell {
    const ps = '/bin/ps';
    const kill='/usr/bin/kill';

    public function ps($username){
        $command[] = self::ps." aux|".self::grep." $username";
        return $this->exec($command);
    }

    public function kill($pid){
        $command = self::kill." -9 ".$pid;
        return $this->exec($command);
    }

    private function exec($command) {
        $res = array();
        if (is_array($command)) {
            foreach ($command as $cmd) {
                //echo $cmd."";
                exec($cmd, &$res);
            }
        } else {
            //echo $command."\n";
            exec($command, &$res);
        }
        return $res;
    }

}
?>