ByetHost server passing html values “Checking your

2019-01-06 17:46发布

站内文章 / PHP
29 0 0

问题:

While trying to parse json string to android, HTML values are passed. Before a day all was working good, and suddenly my app start crashing when trying to fetch database with the help of php files.

When I checked noticed that html values.. see logcat

08-10 01:09:55.814: E/result(6744): <html><body><h2>Checking your browser..<h2><script type="text/javascript" src="/aes.js" ></script><script>function toNumbers(d){var e=[];d.replace(/(..)/g,function(d){e.push(parseInt(d,16))});return e}function toHex(){for(var d=[],d=1==arguments.length&&arguments[0].constructor==Array?arguments[0]:arguments,e="",f=0;f<d.length;f++)e+=(16>d[f]?"0":"")+d[f].toString(16);return e.toLowerCase()}var a=toNumbers("f655ba9d09a112d4968c63579db590b4"),b=toNumbers("98344c2eee86c3994890592585b49f80"),c=toNumbers("7965e114a1dccaf35af3756261f75ad8");document.cookie="__test="+toHex(slowAES.decrypt(c,2,a,b))+"; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/";location.href="http://realroom.byethost24.com/medical/stokist.php?ckattempt=1";</script></body></html>
08-10 01:09:55.814: E/JSON Parser(6744): Error parsing data org.json.JSONException: Value <html><body><h2>Checking of type java.lang.String cannot be converted to JSONObject
08-10 01:09:55.816: E/AndroidRuntime(6744): FATAL EXCEPTION: AsyncTask #1
08-10 01:09:55.816: E/AndroidRuntime(6744): Process: com.example.medionline, PID: 6744
08-10 01:09:55.816: E/AndroidRuntime(6744): java.lang.RuntimeException: An error occured while executing doInBackground()
08-10 01:09:55.816: E/AndroidRuntime(6744):     at android.os.AsyncTask$3.done(AsyncTask.java:304)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.lang.Thread.run(Thread.java:818)
08-10 01:09:55.816: E/AndroidRuntime(6744): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.toString()' on a null object reference
08-10 01:09:55.816: E/AndroidRuntime(6744):     at com.example.medionline.All_supplier_list$FetchMFG.doInBackground(All_supplier_list.java:182)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at com.example.medionline.All_supplier_list$FetchMFG.doInBackground(All_supplier_list.java:1)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at android.os.AsyncTask$2.call(AsyncTask.java:292)
08-10 01:09:55.816: E/AndroidRuntime(6744):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-10 01:09:55.816: E/AndroidRuntime(6744):     ... 4 more

This is happening to all the pages that I have hosted on byethost server, while the pages that are hosted on other server are working well and fine. I tried moving one of my file to other server and on that it is returning proper json string.

Also when I check the url in browser it is returning proper json string without any exception or error with byethost.. but in android giving html values..

Here's my JSONfunction class

package com.example.medionline;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;    
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONfunctions
{

     static InputStream is = null;
 static String result = "";
 static JSONObject jArray = null;
public static JSONObject getJSONfromURL(String url) 
{
    // Download JSON data from URL
    try 
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);
        httppost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240 ");
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();
    } 
    catch (Exception e) 
    {
        Log.e("log_tag", "Error in http connection " + e.toString());
    }

    try 
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) 
        {
            Log.e("jsonnnnnnn", line);
            sb.append(line + "\n");
        }
        is.close();
        result = sb.toString();
        Log.e("result", result);
    } 
    catch (Exception e) 
    {
        Log.e("log_tag", "Error converting result " + e.toString());
    }
    try 
    {
        jArray = new JSONObject(result);
    } 
    catch (JSONException e)
    {
        Log.e("log_tag", "Error parsing data " + e.toString());
    }
    return jArray;
}

public static JSONObject makeHttpRequest(String loginUrl, String post, List<NameValuePair> para)
{
    try 
    {
        if(post == "POST")
        {
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(loginUrl);
            httpPost.setEntity(new UrlEncodedFormEntity(para));
            httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240 ");
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        }
        else if(post == "GET")
        {
            HttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(para, "utf-8");
            loginUrl += "?" + paramString;
            HttpGet httpGet = new HttpGet(loginUrl);
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }
    }
    catch (UnsupportedEncodingException e)
    {
        e.printStackTrace();
    }
    catch (ClientProtocolException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    try 
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        if (is != null) 
        {
            while ((line = reader.readLine()) != null) 
            {
                //Log.e("jsonnnnnnn", line);
                sb.append(line + "\n");
            }
            is.close();
            result = sb.toString();
            Log.e("result", result);
        }
    }
    catch (Exception e)
    {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }
    try
    {
        jArray = new JSONObject(result);
    }
    catch (JSONException e)
    {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }
    return jArray;
}
}

And this is my PHP file

<?php
include('config.php');
date_default_timezone_set("Asia/Calcutta");

$result1 = mysqli_query($con,"SELECT  *
                                    FROM  `pj_medionline_mst_stockist` 
                                    ORDER BY  `pj_medionline_mst_stockist`.`ID` ASC ");


$response = array();
$posts = array();
while($row=mysqli_fetch_array($result1))
{
    $id =$row["ID"];
    $stkcode =$row["stkcode"];
    $comName =$row["ComName"];
    $operatorid =$row["operatorid"];
    $password =$row["Password"];


    $posts[] = array('id'=>$id, 'stkcode'=>$stkcode, 'stkname'=>$comName, 'operatorid'=>$operatorid, 'password'=>$password);
}

$response['stokist'] = $posts;
print(json_encode($response));
?>

回答1:

Solved!

I had the same issue using Byethost to retrieve JSON data from my PHP server. We just need to add a cookie to the HTTP request to pass the testcookie-nginx-module

As Richard's answer says:

The main problem is that Byet Host implement a simple security antibots module >named testcookie-nginx-module

https://kyprizel.github.io/testcookie-nginx-module/

On the link he provided we can see that the testcookie-nginx-module makes a 2-steps validation:

  1. The first time that a HTTP request is done, the module returns a javascript instead of the JSON we are expecting. This script is executed on the client (tipically a web browser) and generates a validation cookie containing an AES key.

Here's the script I've received form my server:

<html>
<body>
    <script type="text/javascript" src="/aes.js" ></script>
    <script>
        function toNumbers(d){
        var e=[];
            d.replace(/(..)/g,function(d){
                e.push(parseInt(d,16))});
            return e
        }
        function toHex(){
            for(var d=[],d=1==arguments.length&&arguments[0].constructor==Array?arguments[0]:arguments,e="",f=0;f<d.length;f++)
                e+=(16>d[f]?"0":"")+d[f].toString(16);
                return e.toLowerCase()
        }
        var a=toNumbers("f655ba9d09a112ffff8c63579db590b4"),
            b=toNumbers("98344c2eee86c3ffff90592585b49f80"),
            c=toNumbers("1286963467aa92ffff8323bdca0d7be9");
        document.cookie="__test="+toHex(slowAES.decrypt(c,2,a,b))+"; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/"; 
        location.href="http://myserver.byethost8.com/myPhpPage.php?i=1";
    </script>
    <noscript>This site requires Javascript to work, please enable Javascript in your browser or use a browser with Javascript support</noscript>
</body>

  1. The script adds the validation cookie to the document and redirects it to the url we actually want to access. The testcookie-nginx-module validates the cookie AES key and and let the request hit the url that will response with the JSON data we want to access.

On the following HTTP requests the client will have stored the cookie and will add it to the request skipping the step 1.

Solution for our Android App

We are going to skip the cookie generation by getting it from a web browser and add it directly to our Android HTTP request (Unless of course you want to get involved in generating it).

Before you get the cookie from the web browser make sure you accessed the url at least once with the browser to generate it.

  • Getting the cookie key from the web browser. I used Google Chrome for it:

    1. From the Chrome menu in the top right corner of the browser, select Settings.
    2. At the bottom of the page, click Show advanced settings....
    3. Under Privacy, select Content settings....
    4. select All cookies and site data....
    5. Search for you website name. By searching "byethost" you'll find it.
    6. Open the cookie named __test and copy the values of content, path and expires

  • Setting the cookie on our Android app. On your code should be something like:

    try 
{
 if(post == "POST")
 {
     HttpClient httpClient = new DefaultHttpClient();
     HttpPost httpPost = new HttpPost(loginUrl);
     httpPost.setEntity(new UrlEncodedFormEntity(para));
     httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240 ");
     httpPost.addHeader("Cookie", "__test=THE_CONTENT_OF_YOUR_COOKIE_HERE; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/");
     HttpResponse httpResponse = httpClient.execute(httpPost);
     HttpEntity httpEntity = httpResponse.getEntity();
     is = httpEntity.getContent();
}
else if(post == "GET")
{
    HttpClient httpClient = new DefaultHttpClient();
    String paramString = URLEncodedUtils.format(para, "utf-8");
    loginUrl += "?" + paramString;
    HttpGet httpGet = new HttpGet(loginUrl);
    httpGet.addHeader("Cookie", "__test=THE_CONTENT_OF_YOUR_COOKIE_HERE; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/");
    HttpResponse httpResponse = httpClient.execute(httpGet);
    HttpEntity httpEntity = httpResponse.getEntity();
    is = httpEntity.getContent();
}
}

And that's it. Now every time the app makes an HTTP request it will include the cookie to pass the testcookie-nginx-module and will be retrieving your JSON data.

I hope this helps and is not too late.

Regards



回答2:

The main problem is that Byet Host implement a simple security antibots module named testcookie-nginx-module

https://kyprizel.github.io/testcookie-nginx-module/

This make your app crash



回答3:

This is a newly introduced bot detection feature on free hosting to prevent unwanted bots. This only appears upon first visit to the page.

For example /upper_respiratory_infection.htm?ckattempt=1 has been registered 37 times by my web analytics between Aug 8 and Aug 11. It is creating havoc with my web analytics since I am now collecting two sets of data for each page (one with and one without CKattempt=1, and a few even carrying the add-on CKattempt=2)

This can not be removed unfortunately

for more detail



回答4:

I should add the following as answer as it is the workaround to bypass the above problem. Posting as it might help someone:

This problem can be solved by simply writing exit(); in the php file at the last executable statement. This will exit the php file and will not append the text. eg.

<?php
include('config.php');
date_default_timezone_set("Asia/Calcutta");

$result1 = mysqli_query($con,"SELECT  *
                                FROM  `pj_medionline_mst_stockist` 
                                ORDER BY  `pj_medionline_mst_stockist`.`ID` ASC ");


$response = array();
$posts = array();
while($row=mysqli_fetch_array($result1))
{
    $id =$row["ID"];
    $stkcode =$row["stkcode"];
    $comName =$row["ComName"];
    $operatorid =$row["operatorid"];
    $password =$row["Password"];


    $posts[] = array('id'=>$id, 'stkcode'=>$stkcode, 'stkname'=>$comName, 'operatorid'=>$operatorid, 'password'=>$password);
}

$response['stokist'] = $posts;
print(json_encode($response));
exit();
?>


标签： php android json httprequest httpresponse
举报

收藏的人(0)

Ta的文章 更多文章
登录 后发表评论
0条评论
还没有人评论过~