php 使用curl模拟ip和来源进行访问的实现方法

对于限制了ip和来源的网站，使用正常的访问方式是无法访问的。本文将介绍一种方法，使用php的curl类实现模拟ip和来源，访问那些限制了ip和来源的网站。

1.设置页面限制ip和来源访问

server.php

<?php

$client_ip = getip();
$referer = getreferer();

$allow_ip = '192.168.1.100';
$allow_referer = '';

if($client_ip==$allow_ip && strpos($referer, $allow_referer)===0){
  echo 'allow access';
}else{
  echo 'deny access';
}


// 获取访问者ip
function getip(){
  if(!empty($_SERVER['HTTP_CLIENT_IP'])){
    $cip = $_SERVER['HTTP_CLIENT_IP'];
  }elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
    $cip = $_SERVER['HTTP_X_FORWARDED_FOR'];
  }elseif(!empty($_SERVER['REMOTE_ADDR'])){
    $cip = $_SERVER['REMOTE_ADDR'];
  }else{
    $cip = '';
  }
  return $cip;
}

// 获取访问者来源
function getreferer(){
  if(isset($_SERVER['HTTP_REFERER'])){
    return $_SERVER['HTTP_REFERER'];
  }
  return '';
}

?>

2.使用curl正常访问

<?php
function doCurl($url, $data=array(), $header=array(), $timeout=30){

  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
  curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);

  $response = curl_exec($ch);

  if($error=curl_error($ch)){
    die($error);
  }

  curl_close($ch);

  return $response;

}

// 调用
$url = 'http://www.example.com/server.php';
$response = doCurl($url);

echo $response;
?>

返回 deny access

3.使用curl模拟ip和来源进行访问

模拟来源

curl_setopt($ch, CURLOPT_REFERER, '来源');

模拟ip

curl_setopt($ch, CURLOPT_HTTPHEADER, array('CLIENT-IP: 模拟ip','X-FORWARDED-FOR: 模拟ip'));

完整代码如下：

<?php
function doCurl($url, $data=array(), $header=array(), $referer='', $timeout=30){

  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
  curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);

  // 模拟来源
  curl_setopt($ch, CURLOPT_REFERER, $referer);

  $response = curl_exec($ch);

  if($error=curl_error($ch)){
    die($error);
  }

  curl_close($ch);

  return $response;

}

// 调用
$url = 'http://www.example.com/server.php';
$data = array();

// 设置IP
$header = array(
  'CLIENT-IP: 192.168.1.100',
  'X-FORWARDED-FOR: 192.168.1.100'
);

// 设置来源
$referer = '/';

$response = doCurl($url, $data, $header, $referer, 5);

echo $response;
?>

返回 allow access

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