是否有可能在輸入緩衝區中寫入超過預期的功能？ （沒有堆棧溢出）

Question

我正在做一些數據包轉換補丁。 我的dll注入中文遊戲，鉤住recv，偵聽數據包並翻譯中文收到的字符串。 我是編碼和編碼和編碼......直到我發現我應該如何寫在buf超過數據包長度？

int __stdcall Hooked_recv(SOCKET s, char *buf, int len, int flags) 
{ 
    h_recv.PreHook(); 

    int ret_val = recv(s, buf, len, flags); 
//ret_val is the number of bytes received. Ok, I can increase it, but... 
//what to do with buf? Sure I can write there as much as no access violation appears. 
//but I need a safe way. 
//I guess if I do buf = new char[NEW_SIZE] then caller will fail to read buf because of pointer changed? 
//what could I do to make received packet longer? 
//I no want to reverse exe and increase buffer in hex editor. at least for now. 

    h_recv.PostHook(); 

    return ret_val; 
} 

Answer 1

只需儘可能地填充緩衝區即可。如果您有任何剩餘物品，請將其保存以供下一次呼叫您的掛鉤接收功能（首先將其填入，如果填滿了它，請重複保存新的剩餘物）。您將需要使用緩衝區，這是不可避免的。