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登陆界面限制到只允许一台机器在线

2020-02-06 18:14:49
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<?php
ob_start();
session_start();
class cc{
    private $refurl="http://www.abc.com";        //登陆成功后转换页面
    private $loginflag=false;                //登陆成功标志
    private $loginfile="loginmsg.txt";            //信息文件

    function setflag($flag){
        $this->loginflag=$flag;
    }
    function check(){
    global $_post;
        if(file_exists($this->loginfile)&& (time()-filemtime($this->loginfile))<60){//用户登陆存在而且有效
            $info=file($this->loginfile);
            $username=trim($info[0]);    //已在线的登陆用户名
            $password=trim($info[1]);    //已在线密码(可以不保存)
            $ip     =trim($info[2]);    //已在线ip
            $sid     =trim($info[3]);    //已在线port
            if(strcmp($_session[loginuser],$username)==0){
                if(strcmp($_session['loginpw'],$password)==0){
                    if(strcmp($_server[remote_addr],$ip)==0){
                        if(strcmp(session_id(),$sid)==0){
                            $this->setflag(true);
                            echo "<h3>您的帐户可以确定是唯一的!</h3>";
                            $cf=fopen($this->loginfile,"a+");
                            fputs($cf,"/r/na");
                            fclose($cf);
                            echo "<meta http-equiv=refresh content=/"10;url=t.php/">";
                            //echo "<iframe src=/"t.php/" frameborder=0 width=0 height=0></iframe>";
                        }else{
                            echo "不允许帐户在局网上同时登陆.. ".$_server[remote_port];
                            $this->loginflag=false;
                        }                
                    }else{
                        echo "不允许使用帐户同时登陆..<br>";
                            $this->loginflag=false;
                    }
                }else{
                    echo "密码错误..<br>";
                    $this->loginflag=false;
                }
            }else{
            //这里验证身份如果正确则
                echo "帐户登陆时发生错误!用户名错误<br><pre>";
            }
        }else{
            if(isset($_post[loginuser])){
                $_session[loginuser]=$_post[loginuser];
                $_session[loginpw]=$_post[loginpw];
                $fp=fopen($this->loginfile,"w");
                $msg=$_post['loginuser']."/r/n".$_post['loginpw']."/r/n".$_server[remote_addr]."/r/n".session_id();;
                fputs($fp,$msg);
                fclose($fp);
            }else{
                $outtime=time()-filemtime($this->loginfile)-60;
                echo "登陆不存在或您已经超时(".$outtime."秒)...";
            }
        }
    }
    function wfrom(){
    global $_post;
    if(!file_exists($this->loginfile) ||(time()-filemtime($this->loginfile))>60){        //登陆失败
    echo <<<loginform
    <form action="$_server[php_self]" method="post" name="loginform">
        <table cellpadding=0 border=0>
        <tr><td>
        用户名:<td><input type="text" name="loginuser"></span><br>
        <tr><td>密码:<td><input type="password" name="loginpw"></span><br>
        <tr><td> <td><input type="button" value=" login " onclick="if(this.form.loginuser.length*this.form.loginpw.length!=0){this.form.submit();}else{return false;}">
        </table>
    </form>
loginform;
    }else{
        echo "已有用户登陆";
    }
    }
}
$d=new cc;
$d->check();
$d->wfrom();
?>
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