Creating a Wi-fi Password generator using C++

Hello, coders. Welcome to the codewithrandom blog. In this article, we will learn how to create a simple Wifi Password Project using C++.

This is a  simple C++ program which utilizes the Windows command prompt to obtain the user’s computer’s stored Wi-Fi passwords and save them to a text file. It is a simple App to retrieve passwords of your known WiFi networks that you have connected to before on your device. The retrieved passwords will be stored in a ‘.txt’ file. You can open the file to take a look at all the retrieved passwords.

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You can directly use this code by copying it in your IDE to understand the working and then can create it by understanding the project.

#include <iostream>
#include <sstream>
#include <fstream>
#include <string.h>
#include <stdexcept>
#include <stdio.h>
#include <string>
#include <vector>

using namespace std;

string exec(const char* cmd) {
    char buffer[128];
    string result = "";
    FILE* pipe = _popen(cmd, "r");
    if (!pipe) throw runtime_error("_popen() failed!");
    try {
        while (fgets(buffer, sizeof buffer, pipe) != NULL) {
            result += buffer;
        }
    } catch (...) {
        _pclose(pipe);
        throw;
    }
    _pclose(pipe);
    return result;
}

vector<string> getWifiList() {
    stringstream ss(exec("netsh wlan show profile").data());
    string input;
    vector<string> wifi;
    while(getline(ss,input))
        if (input.find("All User Profile") != string::npos)
            wifi.push_back(input.substr(27,input.length()));
    return wifi;
}

string getPassword(string ssid) {
    string command = "netsh wlan show profile \"" + ssid + "\" key=clear";
    stringstream ss(exec(command.data()).data());
    string input;
    while(getline(ss,input)){
        if (input.find("Key Content") != string::npos)
            return input.substr(29,input.length());
    }
    return "< NULL >";
}


int main()
{
    cout << "Getting list of known wifi networks..\n\n";
    vector<string> wifi = getWifiList();

    ofstream ofs("saved-wifi-passwords.txt");
    for (string ssid: wifi)
    {
        cout << "Getting password for " << ssid << "..\n";
        ofs << "SSID\t:\t" << ssid << "\n";
        ofs << "Key\t:\t" << getPassword(ssid) << "\n\n";
    }
    ofs.close();
    cout << "\nOuput saved to `saved-wifi-passwords.txt`..\n";

    return 0;
}

Now let us understand the code:-

• We will start off by writing the header of the code with the required libraries – <iostream>, <sstream>, <fstream>, <string.h>, <stdexcept>, <stdio.h>, <string>, <vector>.
• Now we will define a function called exec that takes a command as a parameter and returns the output of that command. It uses error handling – try catch block, if statement and a while loop. This function is used to retrieve the Wi-Fi information.
• We will create a vector or string type called getWifiList(). It uses  the function called exec to execute the “netsh wlan show profile” command and then retrieve a list of all the saved Wi-Fi networks for your device. Then this function extracts the SSID of each network and adds it to a vector of string type called wifi.
• Creating a function called getPassword of string type which takes SSID as a parameter constructs a ‘netsh’ command to retrieve the password for that network. It uses the ‘exec’ function to execute the command and retrieve the password from the output.
• The main() function firstly prints “Getting list of known wifi networks..”, on the console. It retrieves the list of saved Wi-Fi networks using ‘getWifiList’. It then iterates over each network, retrieves its password using ‘getPassword’, and saves the SSID and password to a text file called ‘saved-wifi-passwords.txt’.
• At last the program prints a message on the console stating that the output has been saved to the .txt file. We can check the password list in that file – “Ouput saved to `saved-wifi-passwords.txt`..”.
• This sums up our Simple Wi-fi Password Project using C++.

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Final Output:-

Here is an example to show how this project works.

After running the C++ program on our IDE:

The passwords are saved in the saved-wifi-passwords.txt file.

Conclusion

We have reached the end of this article and have a lot more projects in C++ coming so stay tuned. We have started with awesome and fun projects for you all to understand C++. Learning C++ by creating fun projects makes learning easy and interesting.

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If you enjoyed the article and learned something new today, let us know in the comments.

Thank you.

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