shellcode addr and size

inject/main.cpp

 #include <iostream>
 #include <string>
+#include <vector>
 
 #include "elf.h"
 #include "process.h"
@@ -32,11 +33,13 @@ int main(int argc, char *argv[])
     std::cout << "[+] entry: 0x" << entry << std::endl;
 
     // copy shellcode to process' entry
-    auto call_libc_dlopen_mode_addr = &call_libc_dlopen_mode;
+    auto call_libc_dlopen_mode_addr = reinterpret_cast<unsigned char *>(&call_libc_dlopen_mode);
     auto call_libc_dlopen_mode_size =
         Elf(argv[0]).get_func_size(reinterpret_cast<std::size_t>(call_libc_dlopen_mode_addr));
+    std::vector<unsigned char> shellcode(call_libc_dlopen_mode_addr,
+                                         call_libc_dlopen_mode_addr + call_libc_dlopen_mode_size);
     std::cout << "[+] shellcode: 0x" << reinterpret_cast<std::size_t>(call_libc_dlopen_mode_addr) << " " << std::dec
-              << call_libc_dlopen_mode_size << std::endl;
+              << shellcode.size() << std::endl;
 
     // call shellcode