readme and ip check update (#45)

README.md

@@ -56,6 +56,11 @@ apk add netscanner --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testin
 ```
 cargo install netscanner
 ```
+
+## Windows Installation
+
+To use `netscanner` on Windows, you need to install [Npcap](https://npcap.com/dist/npcap-1.80.exe), otherwise you may encounter packet.dll error. Npcap is a packet capture library required for network scanning and packet analysis.
+
 ## Appreciation
 `netscanner` has been made thanks to some awesome libraries that can be found in [Cargo.toml](./Cargo.toml) file.
 But mostly I would like to link these two libraries that help me the most:

src/components/interfaces.rs

@@ -51,12 +51,11 @@ impl Interfaces {
         let interfaces = datalink::interfaces();
         for intf in &interfaces {
             // -- get active interface with non-local IP
-            if cfg!(windows) || (intf.is_up() && !intf.ips.is_empty()) {
+            if (cfg!(windows) || intf.is_up()) && !intf.ips.is_empty() {
                 // Windows doesn't have the is_up() method
                 for ip in &intf.ips {
-                    // -- set active interface that's not localhost and starts with 192 [for windows compatibility]
-                    if let IpAddr::V4(ipv4) = ip.ip() { 
-                        if ipv4.octets()[0] == 192 && ip.ip().to_string().ne("127.0.0.1") {
+                    if let IpAddr::V4(ipv4) = ip.ip() {
+                        if ipv4.is_private() && !ipv4.is_loopback() && !ipv4.is_unspecified() {
                             self.active_interfaces.push(intf.clone());
                             break;
                         }