first commit

Debugger.cpp

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+// Debugger.cpp
+#include "Debugger.hpp"
+#include <iostream>
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <signal.h>
+
+Debugger::Debugger(const std::string& prog_name) : program_name(prog_name) {}
+
+void Debugger::run() {
+    child_pid = fork();
+    if (child_pid == 0) {
+        run_target();
+    } else if (child_pid > 0) {
+        run_debugger();
+    } else {
+        std::cerr << "[!] fork() failed.\n";
+    }
+}
+
+void Debugger::run_target() {
+    std::cout << "[+] Child process started.\n";
+    ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
+    execl(program_name.c_str(), program_name.c_str(), nullptr);
+}
+
+void Debugger::run_debugger() {
+    int status;
+    waitpid(child_pid, &status, 0);
+    std::cout << "[+] Debugger attached to PID: " << child_pid << "\n";
+
+    ptrace(PTRACE_CONT, child_pid, nullptr, nullptr);
+    waitpid(child_pid, &status, 0);
+
+    std::cout << "[+] Child process exited.\n";
+}
+

Debugger.hpp

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+// Debugger.hpp
+#pragma once
+#include <string>
+#include <sys/types.h>
+
+class Debugger {
+public:
+    Debugger(const std::string& prog_name);
+    void run();
+
+private:
+    void run_target();
+    void run_debugger();
+
+    std::string program_name;
+    pid_t child_pid;
+};
+

Makefile

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+# Makefile
+CXX = g++
+CXXFLAGS = -Wall -Wextra -Werror
+
+SRC = main.cpp Debugger.cpp
+OBJ = $(SRC:.cpp=.o)
+TARGET = nullDBG
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CXX) $(CXXFLAGS) -o $@ $^
+
+clean:
+	rm -f $(OBJ)
+
+fclean: clean
+	rm -f $(TARGET)
+
+re: fclean all
+
+.PHONY: all clean fclean re

main.cpp

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+// main.cpp
+#include "Debugger.hpp"
+#include <iostream>
+
+int main(int argc, char* argv[]) {
+    if (argc < 2) {
+        std::cerr << "Usage: " << argv[0] << " <program to debug>\n";
+        return -1;
+    }
+
+    Debugger dbg(argv[1]);
+    dbg.run();
+    return 0;
+}
+