sniffing early work

use `tun` crate examope for starters, to map all traffic through tun
virtual interface, in next commits will push these packets to sniffing
module which will deciede further modifications of proxies based by
user's Config.

src/geoparsers/geoip2.rs

@@ -33,7 +33,7 @@ pub struct Rule {
     pub action: RouteAction,
 }
 
-pub fn parse_ruleset(config: NSCConfig) -> Result<Rules, Box<dyn std::error::Error>> {
+pub fn parse_ruleset(config: Config) -> Result<Rules, Box<dyn std::error::Error>> {
     let reader = maxminddb::Reader::open_readfile(config.geo_files[0].clone())?;
 
     // Ok(())

src/main.rs

@@ -1,6 +1,12 @@
 mod config;
 mod geoparsers;
+mod sniffing;
+mod startup;
+
+use startup::init;
+
+use std::io::Read;
 
 fn main() {
-    println!("Hello, world!");
+    init();
 }

src/sniffing/headers.rs

@@ -0,0 +1 @@
+// Here we will recieve bytes and try to get their destanation & apply Rules for them.

src/sniffing/mod.rs

@@ -0,0 +1,2 @@
+pub mod headers;
+mod metadata;

src/startup.rs

@@ -0,0 +1,25 @@
+// Here we iniitialize systems crucial for nsc
+use std::io::Read;
+
+pub fn init() -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
+    let mut config = tun::Configuration::default();
+    config
+        .address((10, 0, 0, 9))
+        .netmask((255, 255, 255, 0))
+        .destination((10, 0, 0, 1))
+        .up();
+
+    #[cfg(target_os = "linux")]
+    config.platform_config(|config| {
+        // requiring root privilege to acquire complete functions
+        config.ensure_root_privileges(true);
+    });
+
+    let mut dev = tun::create(&config)?;
+    let mut buf = [0; 4096];
+
+    loop {
+        let amount = dev.read(&mut buf)?;
+        println!("{:?}", &buf[0..amount]);
+    }
+}