Hello friends, I'm Kruvazör.
Today, we will prevent applications from accessing the internet by writing firewall rules using C#.
You can also perform the same task by entering firewall settings without needing much technical knowledge, but some people struggle with even basic keyboard usage...
Scenario (Real)
Due to the high prices of games, a poor programmer who cannot afford to play Sekiro: Shadows Die Twice is searching for a solution.
The idea of downloading a crack comes to mind, but he doesn't want to contribute bitcoin to a Vietnamese hacker group.
He then considers visiting zartoyunzurtsatis.com to buy a Steam account for 20 lira and proceeds with the purchase.
Feeling delighted with his crafty maneuver, he eagerly tries to play the game, but is met with the harsh reality that "Cheap meat doesn't smell good". Unable to access the game because the account is being used by millions of Chinese, Indians, and others, and only one person can access a game on Steam at a time.
Due to the failure of his plans, the programmer, who throws himself from the seas of tears to the mountains of sorrow, makes his final devilish move and opens Visual Studio:
He designs a form as follows and places GroupBox2 on top of GroupBox1.
(Here's the final version)
And he starts writing the code:
He installs the library named vocaluxe.dependencies.netfwtypelib via NuGet and adds the library.
Today, we will prevent applications from accessing the internet by writing firewall rules using C#.
You can also perform the same task by entering firewall settings without needing much technical knowledge, but some people struggle with even basic keyboard usage...
Scenario (Real)
Due to the high prices of games, a poor programmer who cannot afford to play Sekiro: Shadows Die Twice is searching for a solution.
The idea of downloading a crack comes to mind, but he doesn't want to contribute bitcoin to a Vietnamese hacker group.
He then considers visiting zartoyunzurtsatis.com to buy a Steam account for 20 lira and proceeds with the purchase.
Feeling delighted with his crafty maneuver, he eagerly tries to play the game, but is met with the harsh reality that "Cheap meat doesn't smell good". Unable to access the game because the account is being used by millions of Chinese, Indians, and others, and only one person can access a game on Steam at a time.
Due to the failure of his plans, the programmer, who throws himself from the seas of tears to the mountains of sorrow, makes his final devilish move and opens Visual Studio:
He designs a form as follows and places GroupBox2 on top of GroupBox1.
(Here's the final version)
And he starts writing the code:
He installs the library named vocaluxe.dependencies.netfwtypelib via NuGet and adds the library.
Kod:
using NetFwTypeLib;
C#:
public partial class Form1 : Form
{
private Dictionary<string, INetFwRule> ruleDictionary;
//kuralları listelemek adına kullanılacak bir dict yapısı oluşturuyorum
public Form1()
{
InitializeComponent();
ruleDictionary = new Dictionary<string,INetFwRule>();
LoadFirewallRules();
}
private void Form1_Load(object sender, EventArgs e)
{
LoadFirewallRules();
groupBox1.Visible = false;
groupBox2.Visible = false;
}
//
private void LoadFirewallRules()
{
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
// Tüm kuralları al
foreach (INetFwRule rule in firewallPolicy.Rules)
{
try
{
//kuralları listboxa dökmek için sihir yapıyorum
INetFwRule2 fwRule = (INetFwRule2)rule;
if (!ruleDictionary.ContainsKey(fwRule.Name))
{
ruleDictionary.Add(fwRule.Name, fwRule);
listBox1.Items.Add(fwRule.Name);
}
}
catch (InvalidCastException)
{
// valla burda hata veriyodu burayı çaldım :P
continue;
}
}
}
private void kuralToolStripMenuItem_Click(object sender, EventArgs e)
{
groupBox1.Visible = true;
groupBox2.Visible = false;
//işte stripmenuye tıklanınca groupboxlardan biri gözüksün diğeri gözükmesin şeyi
}
private void button1_Click_1(object sender, EventArgs e)
{
if (textBox1.Text=="")
{
MessageBox.Show("Kural adını doldurunuz!");
}
else
{
try
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "Executable Files (*.exe)|*.exe|All Files (*.*)|*.*";
openFileDialog.FilterIndex = 1;
openFileDialog.RestoreDirectory = true;
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
string selectedAppPath = openFileDialog.FileName;
textBox2.Text = openFileDialog.FileName;
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
// Yeni bir kural oluştur
INetFwRule rule = (INetFwRule)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FWRule"));
rule.Action = NET_FW_ACTION_.NET_FW_ACTION_BLOCK; // Bağlantıyı engelle
rule.Direction = NET_FW_RULE_DIRECTION_.NET_FW_RULE_DIR_OUT; // Giden bağlantıları engelle
rule.Enabled = true;
rule.ApplicationName = selectedAppPath;
rule.Name = textBox1.Text;
// Kuralı güvenlik duvarına ekle
firewallPolicy.Rules.Add(rule);
MessageBox.Show("Kural başarıyla oluşturuldu.", "Başarılı", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
catch (Exception ex)
{
MessageBox.Show("Hata oluştu: " + ex.Message, "Hata", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
private void kuralKaldırToolStripMenuItem_Click(object sender, EventArgs e)
{
groupBox2.Visible = true; groupBox1.Visible = false;
LoadFirewallRules();
}
private void button2_Click(object sender, EventArgs e)
{
if (listBox1.SelectedItem != null)
{
string selectedRuleName = listBox1.SelectedItem.ToString();
if (MessageBox.Show($"Seçilen kuralı silmek istediğinizden emin misiniz?\n\nKural Adı: {selectedRuleName}", "Kuralı Sil", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
{
try
{
// Kuralı güvenlik duvarından kaldır
INetFwRule ruleToRemove = ruleDictionary[selectedRuleName];
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
firewallPolicy.Rules.Remove(ruleToRemove.Name);
listBox1.Items.Remove(selectedRuleName);
ruleDictionary.Remove(selectedRuleName);
MessageBox.Show("Kural başarıyla kaldırıldı.", "Başarılı", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show("Kural kaldırılırken bir hata oluştu: " + ex.Message, "Hata", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
else
{
MessageBox.Show("Lütfen silmek istediğiniz kuralı seçin.", "Uyarı", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
}(Blocking Steam would be more logical.)
Final:
