45.网络游戏逆向分析与漏洞攻防-角色管理功能通信分析-解码发送数据内容输出到日志

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如果看不懂、不知道现在做的什么，那就跟着做完看效果

现在的代码都是依据数据包来写的，如果看不懂代码，就说明没看懂数据包

内容参考于： 易道云信息技术研究院VIP课

上一个内容：44.角色创建服务器反馈数据包分析

码云地址（master 分支）：https://gitee.com/dye_your_fingers/titan

码云版本号：75c763a02e224b8d293d71284044da98f53e2c19

代码下载地址，在 titan 目录下，文件名为：titan-解码发送数据内容输出到日志.zip

HOOK引擎，文件名为：黑兔sdk升级版.zip

以 44.角色创建服务器反馈数据包分析 它的代码为基础进行修改

根据上一个内容游戏登录之后的操作基本上都是0A开头，然后里面有数据参数个数，其中数据参数里就有02开头的数据，现在做的是把这些数据参数全部解读出来，打印到一个文件里，这样将来看这个文件的时候就能知道有多少种规则，大概都是怎样的

效果图：

效果图：

EnCode.h文件的修改：修改了 EnCode结构体

#pragma once

/*
	EnCode结构体 
		un[6]、index、op是8字节
		union里也是8字节
		pointer、back它俩虽然是char类型，但它俩是指针类型，所以它们一共是8字节
		EnCode结构体一共是24字节
*/
class EnCode// 用于表示数据解析约定的数据
{
private:

	char un[6]{};// 
public:
	char index = 0;
	// op + un[3]是四字节，op与buffer是6字节，如果自动内存对齐op与buffer可能不会挨在一起
	char op = 0;

	union
	{
		char dataPool[0x8];
		int lenth;
		char byte;
		short stval;
		int val;
		float fval;
		double dbval;
		long long lval = 0;
	};
	char* pointer = 0;
	char* back = 0;
public:
	EnCode();
	EnCode(char*& buff, unsigned int& _len, char ExIndex = 0);
	EnCode& operator=(char*& buff);
	int Init(char*& buff, char EnIndex = 0);
	~EnCode();
};

class GBYTE :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator char();
	char value();
};
class GSHORT :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator short();
	short value();
};
class GINT :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator int();
	int value();
};
class GFLOAT :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator float();
	float value();
};
class GINT64 :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator long long();
	long long value();
};
class GDOUBLE :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator double();
	double value();
};
class GCHAR :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator const char*();
	const char* value();
};
class GUTF16 :public EnCode {
public:
	using EnCode::EnCode;
	using EnCode::operator=;
	operator const wchar_t*();
	const wchar_t* value();
};

NetClass.h文件的修改：新加 SC_CHOOSECAMP宏

#pragma once
#include "EnCode.h"
// 发送数据操作码定义
#define SC_CHOOSECAMP 591 // 阵营选择操作码
// 发送数据标准头
typedef struct NET_SEND_HEAD {
	// 为了内存对齐，当前结构不可能超过255，所以这样写是没问题的
	char len = sizeof(NET_SEND_HEAD) - 1;
	char op = 0x0A;
	short unst = 0;
	int unnt[4]{};
	short unst1 = 0;
	short count = 0;
}*PNET_SEND_HEAD;

// 申请创建角色结构体
typedef struct NET_CREATEROLE_START {
	char un[0x02];// 用来做内存对齐
	char len = sizeof(NET_CREATEROLE_START) - 3;// 用来做内存对齐
	char op = 0x03;
	int code = 0x01;
}*PNET_CREATEROLE_START;

// 删除角色数据结构
typedef struct DATA_DELROLE {
	char op;
	char buff[0x1F];
	int len;
	int un[8] = { 0x01 , 0x03};

}*PDATADELROLE;

/*
	数据包还原结构体要注意内存对齐，如果数据不满4字节，它字段会补齐
	比如结构体里有一个char变量，它是1字节，在内存里它可能会为了内存对齐
	让它变成4字节，所以这要注意
*/
// 登录数据
typedef struct DATA_LOGIN {
	int op = 0x0300;
	char buff[0x10]{};
	int lenId = 0x10;
	/*
		这个是登录的账号，它可能会变成0x20或更长，现在默认让它0x10
		读的时候以长度为准就好了
	*/
	char Id[0x10]{};
	int lenPass = 0x10;
	/*
		这个是登录的密码，它可能会变成0x20或更长，现在默认让它0x10
		读的时候以长度为准就好了
	*/
	char Pass[0x10]{};
	int lenCode = 0x10;
	char Code[0x10]{};
	int eop = 0x01;
}*PDATALOGIN;
typedef struct DATA_LOGIN_OK {// 登录成功数据包头
	int un[8] = { 0, 0, 0x76B, 0x0C, 0x1E,0, 0, 0 };
	int index = 0;
	int RoleCount = 0;
}*PDATALOGINOK;
typedef class ROLE_DATA {// 登录成功数据包
public:
	GBYTE byte;
	GINT un;
	GINT un1;
	GUTF16 name;
	GUTF16 infos;
	GINT un2;
	GINT64 un3;
}*PROLEDATA;

NetClient.h文件的修改：新加 OnSendCustom函数、DecodeChooseCamp函数

#pragma once
#include "NetClass.h"
class NetClient // 监视客户端每一个操作
{
private:
	PROLEDATA roles;
	unsigned rolecount;
	bool logined = false;

	bool DelRole(wchar_t* rolename, unsigned _len);
public:
	/*
		模拟登陆的方法
		Id是账号
		Pass是密码
		它要基于发送的方法实现，因为我们没有连接socket的操作
	*/
	bool login(const char* Id, const char* Pass);
	bool DelRole(wchar_t* rolename);
	bool StartCreateRole();// 用于创建角色


	// 根据角色名字获取一个登录成功数据包（选择角色列表里的一个数据）
	PROLEDATA GetRoleByName(wchar_t* rolename);
public:
	// 用于拦截游戏删除角色功能
	bool virtual OnDelRole(wchar_t* rolename, unsigned _len);
	// 用于拦截游戏登录功能
	void virtual Onlogin(const char* Id, const char*Pass);
	// 用于拦截游戏创建角色功能
	bool virtual OnStartCreateRole(int code);
	// opcode意思是操作码，count意思是数量，buffStart意思是解码的内容开始，buffend意思是解码的内容结束，buffer是原始的数据，len是原始数据的长度
	// char& buffer, int& len这俩参数带&的原因是，在 OnSendCustom 里进行修改之后，通过&的方式传递回去
	bool virtual OnSendCustom(int opcode, short count, char* buffStart, char* buffend, char*& buffer, unsigned& len);
public:
	bool virtual DecodeChooseCamp(char* buffStart, char* buffend, short count);
public:
	// 处理失败，参数是错误码
	bool virtual Tips(int code);
	void virtual loginok(ROLE_DATA* _roles, int count);
	bool virtual OnScrStartCreateRole(short code,wchar_t* _txt);
};

NetClient.cpp文件的修改：新加 OnSendCustom函数、DecodeChooseCamp函数

#include "pch.h"
#include "NetClient.h"
#include "extern_all.h"

bool NetClient::login(const char* Id, const char* Pass)
{
    
  const int bufflen = sizeof(DATA_LOGIN) + 1;
  char buff[bufflen];
  DATA_LOGIN data;
  // 有些操作系统这样写会报错，因为内存不对齐，现在Windows下没事
  //PDATALOGIN _data = (PDATALOGIN)(buff + 1);
  // 这样写就能解决内存对齐问题
  PDATALOGIN _data =&data;
  int len = strlen(Id);
  memcpy(_data->Id, Id, len);
  len = strlen(Pass);
  memcpy(_data->Pass, Pass, len);
  memcpy(buff+1, _data, sizeof(DATA_LOGIN));
  buff[0] = I_LOGIN;
  return  WinSock->OnSend(buff, sizeof(buff));
  
}

bool NetClient::DelRole(wchar_t* rolename)
{
    PROLEDATA _role = GetRoleByName(rolename);
    if (_role == nullptr) {
        return false;
    }
    else {
        return DelRole(rolename, _role->name.lenth);
    }
    return false;
}

bool NetClient::StartCreateRole()
{
    NET_CREATEROLE_START _data;
    return WinSock->OnSend(&_data.op, _data.len);
}

PROLEDATA NetClient::GetRoleByName(wchar_t* rolename)
{
    //PROLEDATA result = nullptr;
    for (int i = 0; i < rolecount; i++)
    {
        // StrCmpW判断两个字符串是否相同
        // 比较时区分大小写，如果字符串相同返回0
        if (StrCmpW(roles[i].name.value(), rolename) == 0) {
            return &roles[i];
        }

    }
    return nullptr;
}

bool NetClient::DelRole(wchar_t* rolename, unsigned _len)
{
    DATA_DELROLE _data;
    _data.op = 0x06;
    _data.len = _len;
    memcpy(_data.buff, rolename, _len);
    return WinSock->OnSend((char*)&_data, sizeof(DATA_DELROLE) - 1);
}

bool NetClient::OnDelRole(wchar_t* rolename, unsigned _len)
{
    AfxMessageBox(rolename);
    return true;
}

void NetClient::Onlogin(const char* Id, const char* Pass)
{
    
    /*
    const int bufflen = sizeof(DATA_LOGIN) + 1;
    char buff[bufflen];
    DATA_LOGIN data;
    // 有些操作系统这样写会报错，因为内存不对齐，现在Windows下没事
    //PDATALOGIN _data = (PDATALOGIN)(buff + 1);
    // 这样写就能解决内存对齐问题
    PDATALOGIN _data =&data;
    int len = strlen(Id);
    memcpy(_data->Id, Id, len);
    len = strlen(Pass);
    memcpy(_data->Pass, Pass, len);
    memcpy(buff+1, _data, sizeof(DATA_LOGIN));
    buff[0] = I_LOGIN;
    return  WinSock->OnSend(buff, sizeof(buff));
    */
}

bool NetClient::OnStartCreateRole(int code)
{
    return true;
}

bool NetClient::OnSendCustom(int opcode, short count, char* buffStart, char* buffend, char*& buffer, unsigned& len)
{
    switch (opcode)
    {
    case SC_CHOOSECAMP:
        return DecodeChooseCamp(buffStart, buffend, count);
        break;
    default:
        break;
    }
    return true;
}

bool NetClient::DecodeChooseCamp(char* buffStart, char* buffend, short count)
{
    GCHAR coder;
    coder.Init(buffStart, 1);
   
    return true;
}

bool NetClient::Tips(int code)
{
#ifdef  Anly
    CString txt;
    if (code == 51001) {
        txt = L"登陆失败,易道云通行证不存在!";
    }else if (code == 51002) {
        txt = L"登录失败,密码错误!";
    }
    else {
        txt.Format(L"未知登录错误:%d", code);
    }


    anly->SendData(TTYPE::I_LOG, 0, txt.GetBuffer(), txt.GetLength()*2);
#endif
    return true;
}

void NetClient::loginok(ROLE_DATA* _roles, int count)
{
    logined = true;
    if(roles) delete[] roles;
    roles = _roles;
    rolecount = count;
}

bool NetClient::OnScrStartCreateRole(short code, wchar_t* _txt)
{
    return true;
}

GameWinSock.cpp文件的修改：修改了 OnSendCustom函数、AnlyBuff函数

#include "pch.h"
#include "GameWinSock.h"
#include "extern_all.h"
#include "NetClass.h"
#include "EnCode.h"

typedef bool(*DealProc)(char*&, unsigned&);

DealProc SendDealProc[0x100];
DealProc RecvDealProc[0x100];


GameWinSock::PROC GameWinSock::_OnConnect{};
GameWinSock::PROC GameWinSock::_OnSend{};
GameWinSock::PROC GameWinSock::_OnRecv{};

bool DeafaultDeal(char*&, unsigned&) { return true; }

// 登录数据包的处理
bool Onlogin(char*& buff, unsigned& len) {
	PDATALOGIN _data = (PDATALOGIN)(buff + 1);
	char* _id = _data->Id;
	_data = (PDATALOGIN)(buff + 1 + _data->lenId - 0x10);
	char* _pass = _data->Pass;

	Client->Onlogin(_id, _pass);

	/* 修改账号密码
	len = sizeof(DATA_LOGIN) + 1;
	buff = new char[len];
	DATA_LOGIN data;
	PDATALOGIN _data = &data;
	buff[0] = 0x2;

	CStringA _id = "";// 补充账号
	CStringA _pass = "";// 补充密码
	memcpy(_data->Id, _id.GetBuffer(), _id.GetLength());
	memcpy(_data->Pass, _pass.GetBuffer(), _pass.GetLength());
	memcpy(buff + 1, _data, len - 1);
	*/
	/* 监控登录数据
	PDATALOGIN _data = (PDATALOGIN)buff;
	CStringA _id = _data->Id;
	_data = (PDATALOGIN)(buff + _data->lenId - 0x10);
	CStringA _pass = _data->Pass;
	CStringA _tmp;
	// 请求登录 账号[% s]密码[% s] 这个内容别人在逆向的时候就会看到
	// 所以这种东西需要自己搞个编码来代替它

	 _tmp.Format("请求登录 账号[%s]密码[%s]", _id, _pass);
#ifdef  Anly
	anly->SendData(TTYPE::I_DIS, 1, _tmp.GetBuffer(), _tmp.GetAllocLength());
#endif
	*/

	/*
		返回false，游戏无法发送数据包
		原因看调用此此函数的位置 OnSend 函数（if (SendDealProc[buff[0]]((buff + 1), len - 1))）
	*/
	return true;
}

bool OnTips(char*& buff, unsigned& len) {
	int* code = (int*)&buff[1];
	return Client->Tips(code[0]);
}

bool OnDelRole(char*& buff, unsigned& len) {

	PDATADELROLE p = (PDATADELROLE)buff;
	return Client->OnDelRole((wchar_t*)(p->buff), p->len);



	// 返回值改为false将拦截发送的删除角色数据包
	// 详情看注册 OnDelRole 函数的位置，Init函数
	// return true;
}

bool OnloginOk(char*& buff, unsigned& len) {

	PDATALOGINOK _p = (PDATALOGINOK)&buff[1];
	ROLE_DATA* roleDatas = nullptr;
	if (_p->RoleCount > 0) {
		char* buffStart = buff + 1 + sizeof(DATA_LOGIN_OK);
		WinSock->AnlyBuff(buffStart, buff + len);
		roleDatas = new ROLE_DATA[_p->RoleCount];
		for (int i = 0; i < _p->RoleCount; i++)
		{
			roleDatas[i].byte = buffStart;
			roleDatas[i].un = buffStart;
			roleDatas[i].un1 = buffStart;
			roleDatas[i].name = buffStart;
			roleDatas[i].infos = buffStart;
			roleDatas[i].un2 = buffStart;
			roleDatas[i].un3 = buffStart;
		}
		Client->loginok(roleDatas, _p->RoleCount);
	}
	return true;
}

bool OnStartCreateRole(char*& buff, unsigned& len){
	// 申请进入创建角色界面
	int* code = (int*)&buff[1];
	return Client->OnStartCreateRole(code[0]);
}

bool OnSendCustom(char*& buff, unsigned& len) {
	PNET_SEND_HEAD head = (PNET_SEND_HEAD)(buff - 1);
	int icount = head->count;
	char* buffStart = (char*)head + sizeof(NET_SEND_HEAD);
	if (buffStart[0] != 0x02) {

#ifdef  Anly
		anly->SendData(TTYPE::I_DIS, I_SEND_CUSTOM, "SEND_CUSTOM 发现异常数据", 25);
#endif
		return true;
	}
	// 解析一个长度后面的数据
	EnCode coder(buffStart, len, 1);
	GINT* intCoder = (GINT*)&coder;
	// 得到数据
	int opcode = intCoder->value();
#ifdef  Anly
	WinSock->AnlyBuff(buffStart, buff + len, 1);
#endif
	return Client->OnSendCustom(opcode, icount - 1, buffStart, buff + len, buff, len);

}

bool OnSvrStartCreateRole(char*& buff, unsigned& len) {
	short* _st = (short*)&buff[1];
	wchar_t* _txt = (wchar_t*)&buff[3];
#ifdef  Anly
	CString txt;
	CStringA txtA;
	txt.Format(L"code:%d\r\n%s", _st[0], _txt);
	txtA = txt;
	//AfxMessageBox(txtA);
	anly->SendData(TTYPE::I_DIS, S_CREATEROLE_START, txtA.GetBuffer(), txt.GetAllocLength() + 1);
#endif
	return Client->OnScrStartCreateRole(_st[0], _txt);
}

// 这个函数拦截了游戏的连接
bool GameWinSock::OnConnect(char* ip, unsigned port)
{
#ifdef  Anly
	// 长度24的原因，它是宽字节要，一个文字要2个字节，一共是10个文字加上结尾的0是11个
	// 所以 11 乘以2，然后再加2 
	anly->SendData(TTYPE::I_LOG, 0, L"服务器正在连接。。。", 24);
#endif
    // this是ecx，HOOK的点已经有ecx了
    WinSock = this;
	bool b = (this->*_OnConnect)(ip, port);
	// 下方注释的代码时为了防止多次注入，导致虚函数地址不恢复问题导致死循环，通过一次性HOOK也能解决
	/*unsigned* vtable = (unsigned*)this;
	vtable = (unsigned*)vtable[0];
	union {
		unsigned value;
		bool(GameWinSock::* _proc)(char*, unsigned);
	} vproc;

	vproc._proc = _OnConnect;

	DWORD oldPro, backProc;
	VirtualProtect(vtable, 0x10x00, PAGE_EXECUTE_READWRITE, &oldPro);
	vtable[0x34 / 4] = vproc.value;
	VirtualProtect(vtable, 0x10x00, oldPro, &backProc);*/

    return b;
}

bool GameWinSock::OnSend(char* buff, unsigned len)
{
	
	/*
		这里就可以监控游戏发送的数据了
	*/

#ifdef  Anly
	anly->SendData(TTYPE::I_SEND, buff[0], buff, len);
#endif
	/*
		数据包的头只有一字节所以它的取值范围就是0x0-0xFF
	*/
	if (SendDealProc[buff[0]]((buff), len)) {// 执行失败不让游戏发送数据包
		return (this->*_OnSend)(buff, len);
	}
	else {// 发送失败屏蔽消息
		return true;// 屏蔽消息
	}

}

bool GameWinSock::OnRecving(char* buff, unsigned len)
{
	// MessageBoxA(0, "11111111111111", "0", MB_OK);
	/*
		监控游戏接收的数据包
	*/
#ifdef  Anly
	anly->SendData(TTYPE::I_RECV, buff[0], buff, len);
#endif
	return RecvDealProc[buff[0]](buff, len);
}

bool GameWinSock::OnRecv(char* buff, unsigned len)
{
//#ifdef  Anly
//	anly->SendData(1, buff, len);
//#endif
	return (this->*_OnRecv)(buff, len);
}

void GameWinSock::Init()
{
	for (int i = 0; i < 0x100; i++) {
		SendDealProc[i] = &DeafaultDeal;
		RecvDealProc[i] = &DeafaultDeal;
	}
	// 注册登录数据包处理函数
	// SendDealProc[I_LOGIN] = &Onlogin;
	SendDealProc[I_DELROLE] = &OnDelRole;
	SendDealProc[I_CREATEROLE_START] = &OnStartCreateRole;
	SendDealProc[I_SEND_CUSTOM] = &OnSendCustom;
	// 注册数据登录失败数据包处理函数
	RecvDealProc[S_TIPS] = &OnTips;
	RecvDealProc[S_LOGINOK] = &OnloginOk;
	RecvDealProc[S_CREATEROLE_START] = &OnSvrStartCreateRole;
}

// 它会生成一个结构体，详情看效果图
void GameWinSock::AnlyBuff(char* start, char* end, char index)
{
#ifdef  Anly
	CStringA txt;
	CStringA tmp;
	CString utmp;
	EnCode _coder;

	GBYTE* _bytecoder;
	GSHORT* _shortcoder;
	GINT* _intcoder;
	GFLOAT* _floatcoder;
	GDOUBLE* _doublecoder;
	GCHAR* _asccoder;
	GUTF16* _utfcoder;
	GINT64* _int64coder;

	CStringA _opname = data_desc[_coder.index][_coder.op].name;

	while (start < end) {
		_coder.Init(start, index);
		// _opname.MakeLower()是变为小写字母，会影响 _opname它的值
		// 所以又写了一边 data_desc[_coder.index][_coder.op].name
		tmp.Format("%s %s;//", data_desc[_coder.index][_coder.op].name, _opname.MakeLower());
		txt = txt + tmp;
		if (_coder.index == 0) {
			switch (_coder.op)
			{
			case 1:
				_shortcoder = (GSHORT*)&_coder;
				tmp.Format("%d\r\n", _shortcoder->value());
				txt = txt + tmp;
				break;
			case 2:
				_intcoder = (GINT*)&_coder;
				tmp.Format("%d\r\n", _intcoder->value());
				txt = txt + tmp;
				break;
			case 4:
				_floatcoder = (GFLOAT*)&_coder;
				tmp.Format("%f\r\n", _floatcoder->value());
				txt = txt + tmp;
				break;
			case 6:
				_bytecoder = (GBYTE*)&_coder;
				tmp.Format("%d\r\n", _bytecoder->value());
				txt = txt + tmp;
				break;
			case 7:
				_utfcoder = (GUTF16*)&_coder;
				utmp.Format(L"[%s]\r\n", _utfcoder->value());
				tmp = utmp;
				txt = txt + tmp;
				break;
			// 5号之前分析的忘记截图了，现在找不到它的数据包了，如果后面再见到05的时候再详细补充说明
			// 之前的分析05就是double类型
			case 5:
				_doublecoder = (GDOUBLE*)&_coder;
				tmp.Format("%lf\r\n", _doublecoder->value());
				txt = txt + tmp;
				break;
			case 8:
			case 3:
				_int64coder = (GINT64*)&_coder;
				tmp.Format("%l64d\r\n", _int64coder->value());
				txt = txt + tmp;
				break;
			default:
				break;
			}
		}

		if (_coder.index == 1) {
			switch (_coder.op)
			{
			case 1:
				_shortcoder = (GSHORT*)&_coder;
				tmp.Format("%d\r\n", _shortcoder->value());
				txt = txt + tmp;
				break;
			case 2:
				_intcoder = (GINT*)&_coder;
				tmp.Format("%d\r\n", _intcoder->value());
				txt = txt + tmp;
				break;
			case 4:
				_floatcoder = (GFLOAT*)&_coder;
				tmp.Format("%f\r\n", _floatcoder->value());
				txt = txt + tmp;
				break;
			case 6:
				_asccoder = (GCHAR*)&_coder;
				tmp.Format("%s\r\n", _asccoder->value());
				txt = txt + tmp;
				break;
			case 7:
				_utfcoder = (GUTF16*)&_coder;
				utmp.Format(L"[%s]\r\n", _utfcoder->value());
				tmp = utmp;
				txt = txt + tmp;
				break;
			case 5:
				_doublecoder = (GDOUBLE*)&_coder;
				tmp.Format("%lf\r\n", _doublecoder->value());
				txt = txt + tmp;
				break;
			case 8:
			case 3:
				_int64coder = (GINT64*)&_coder;
				tmp.Format("%l64d\r\n", _int64coder->value());
				txt = txt + tmp;
				break;
			default:
				break;
			}
		}
	} 
	anly->SendData(TTYPE::I_DIS, 0, txt.GetBuffer(), txt.GetAllocLength() + 1);
#endif
}

---