利用fiddlercore，修改http/https请求与响应

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利用fiddlercore，修改http/https请求与响应

fiddler抓包工具，相信很多人都用过，很好用的一款抓包工具。

fiddlercore是官方提供给开发者调用的，用来处理所有的http/https请求，功能就如Fiddler一样强大，fiddlercore官方网站：https://www.telerik.com/fiddlercore

下面我们利用fiddlercore来修改浏览器的响应数据。

自动设置https证书，所有请求都返回“二十有为”

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Threading;
using Fiddler;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace Demo
{
    class Program
    {
        static Proxy oSecureEndpoint;
        static string sSecureEndpointHostname = "localhost";
        static int iSecureEndpointPort = 9876;

        static void Main(string[] args)
        {
            Console.WriteLine("Starting ...");
            Fiddler.CertMaker.createRootCert();
            X509Certificate2 oRootCert = Fiddler.CertMaker.GetRootCertificate();
            SetMachineTrust(oRootCert);
            Fiddler.FiddlerApplication.oDefaultClientCertificate = oRootCert;
            List<Fiddler.Session> oAllSessions = new List<Fiddler.Session>();

            #region AttachEventListeners
            Fiddler.FiddlerApplication.BeforeRequest += delegate(Fiddler.Session oS)
            {
                oS.bBufferResponse = true;
                HTTPRequestHeaders rHeads = oS.oRequest.headers;
                //获取cookie
                string cookie = rHeads.AllValues("cookie");
                if ((oS.oRequest.pipeClient.LocalPort == iSecureEndpointPort) && (oS.hostname == sSecureEndpointHostname))
                {
                    oS.utilCreateResponseAndBypassServer();
                    oS.oResponse.headers.HTTPResponseStatus = "200 Ok";
                    oS.oResponse["Content-Type"] = "text/html; charset=UTF-8";
                    oS.oResponse["Cache-Control"] = "private, max-age=0";
                    oS.utilSetResponseBody("<html><body>show!</body></html>");
                }
            };

            Fiddler.FiddlerApplication.BeforeResponse += new Fiddler.SessionStateHandler(FiddlerApplication_BeforeResponse);

            Console.CancelKeyPress += new ConsoleCancelEventHandler(Console_CancelKeyPress);
            #endregion AttachEventListeners

            Fiddler.CONFIG.IgnoreServerCertErrors = true;
            FiddlerApplication.Prefs.SetBoolPref("fiddler.network.streaming.abortifclientaborts", false);

            FiddlerCoreStartupFlags oFCSF = FiddlerCoreStartupFlags.Default;
            int iPort = 0;
            Fiddler.FiddlerApplication.Startup(iPort, oFCSF);

            oSecureEndpoint = FiddlerApplication.CreateProxyEndpoint(iSecureEndpointPort, true, sSecureEndpointHostname);
            if (null != oSecureEndpoint)
            {
                WriteCommandResponse("success!");
            }

            bool bDone = false;
            do
            {
                Console.WriteLine("\nEnter h or q:");
                Console.Write(">");
                ConsoleKeyInfo cki = Console.ReadKey();
                Console.WriteLine();
                switch (cki.KeyChar)
                {
                    case 'q':
                    case 'Q':
                        bDone = true;
                        DoQuit();
                        break;
                }
            } while (!bDone);
        }

        static void FiddlerApplication_BeforeResponse(Fiddler.Session oSession)
        {
            if (oSession.isHTTPS)
            {
                string hostname = oSession.hostname;
                int stateCode = oSession.oResponse.headers.HTTPResponseCode;
                string pathAndQuery = oSession.PathAndQuery;
                //获取服务器返回的html
                string body = oSession.GetResponseBodyAsString();
                //修改body
                body = "二十有为";
                oSession.utilDecodeResponse();
                oSession.utilSetResponseBody(body);
            }
            else
            {
                string body = oSession.GetResponseBodyAsString();
            }
        }

        private static bool SetMachineTrust(X509Certificate2 oRootCert)
        {
            try
            {
                System.Security.Cryptography.X509Certificates.X509Store certStore = new System.Security.Cryptography.X509Certificates.X509Store(StoreName.Root, StoreLocation.LocalMachine);
                certStore.Open(OpenFlags.ReadWrite);
                try
                {
                    certStore.Add(oRootCert);
                }
                finally
                {
                    certStore.Close();
                }
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        static void Console_CancelKeyPress(object sender, ConsoleCancelEventArgs e)
        {
            DoQuit();
        }

        private static void WriteCommandResponse(string s)
        {
            ConsoleColor oldColor = Console.ForegroundColor;
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine(s);
            Console.ForegroundColor = oldColor;
        }

        private static void DoQuit()
        {
            WriteCommandResponse("Shutting down...");
            if (null != oSecureEndpoint) oSecureEndpoint.Dispose();
            Fiddler.FiddlerApplication.Shutdown();
            Thread.Sleep(500);
        }

    }
}

Demo下载地址：https://pan.baidu.com/s/1_s7ywb3O6zuMto5SDH4Jng

提取码：czun

出处：https://www.cnblogs.com/youzilong202/p/17102912.html

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