hijackfilter

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a set of free software to protect you from Internet hijacking

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VFREE HijackFilter is a free software to protect you from unwanted Internet hijacking.

If you encountered Internet hijacking, call your ISP to stop it!
This software should be your last choice for preventing Internet hijacking.

## 1. Installation

### 1.1 Build

- Ubuntu / Debian

``` bash
apt install make gcc iptables-dev linux-headers-`uname -r` pkg-config
make
```

- Fedora

``` bash
dnf install make gcc iptables-devel kernel-devel-`uname -r` pkgconfig
make
```

- RHEL / CentOS

``` bash
yum install make gcc iptables-devel kernel-devel-`uname -r` pkgconfig
make
```

## 1.2 Install

``` bash
make install
depmod
```

## 1.3. Uninstall

``` bash
make uninstall
depmod
```

## 2. Usage

### 2.1 DNSFilter

DNSFilter is a [Netfilter][1] extension to help you match and filter proofed DNS responses.

Suppose your ISP redirects nonexistent domain names to `192.0.2.1` and `198.51.100.1`.
To match and drop those spoofed DNS responses, we can use following commands:

``` bash
# for IPv4 network
iptables -t mangle -A PREROUTING -p udp --sport 53 -m vfree_dns \
  --a 192.0.2.1,198.51.100.1\
  -j DROP
# for IPv6 network
ip6tables -t mangle -A PREROUTING -p udp --sport 53 -m vfree_dns \
  --a 192.0.2.1,198.51.100.1\
  -j DROP
```

Use `-h` option for help.
``` bash
iptables -m vfree_dns -h
```

## 3. TO-DO

- HTTPFilter: a netfilter module to match and filter proofed HTTP messages

## 4. LICENSE

This program is distributed under GNU GENERAL PUBLIC LICENSE Version 3.

[1]: http://www.netfilter.org

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