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+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05d4b17490f70499f20b9e791dcf6a299785ce8af4d709018206dc5b4953e95f"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "winreg"
+version = "0.50.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
+dependencies = [
+ "cfg-if",
+ "windows-sys",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fb3dc5c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "dns_sinky"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+domain = "0.8.0"
+reqwest = { version = "0.11.20"  }
+tokio = { version = "1.32.0", features = ["full"] }
+futures = "0.3.28"
+flate2 = "1.0.27"
+serde = { version = "1.0.188", features = ["derive"] }
+serde_json = "1.0.107"
\ No newline at end of file
diff --git a/LICENCE b/LICENCE
new file mode 100644
index 0000000..fcbba50
--- /dev/null
+++ b/LICENCE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Noah Feldt
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..cae275c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,45 @@
+# DNS-Sinky
+
+A simple [DNS sinkhole](https://en.wikipedia.org/wiki/DNS_sinkhole) implemented in Rust. It works like a simpler version of [pi-hole](https://github.com/pi-hole/pi-hole) or [AdGuardHome](https://github.com/AdguardTeam/AdguardHome).
+
+## Features
+
+DNS-Sinky has the following features:
+
+* Blocking of DNS requests whose domain names are contained in blacklists.
+
+* Configuration of blacklists in `config.json` file.
+
+* Downloading and local storage of DNS blacklists.
+
+* Logging DNS request activity to terminal.
+
+## Installation
+
+You can build the project yourself using the Rust compiler:
+
+```bash
+cargo build --release
+```
+
+Alternatively you can download a pre-compiled version under releases.
+
+## Usage
+
+If you have the Rust compiler installed you can simply build and run with: 
+
+```bash
+cargo run --release
+```
+
+If you downloaded the pre-compiled files, simply run the `dns_sinky.exe` file.
+
+## Configuration
+
+The DNS sinkhole can be configured by changing the keys in the `config.json` file.
+
+* You can change the urls of the DNS blacklists by changing the `urls` field. The default blacklists are from [firebog.net](https://firebog.net/) where the ticked lists are used.
+
+* You can automatically update the lists on startup by activating the `update_on_startup` key. The default setting is `false`.
+
+* You can change the upstream DNS server with the `upstream_dns` key. The default address is `1.1.1.1` by [Cloudflare](https://en.wikipedia.org/wiki/1.1.1.1).
diff --git a/blacklist.gz b/blacklist.gz
new file mode 100644
index 0000000..9894049
Binary files /dev/null and b/blacklist.gz differ
diff --git a/config.json b/config.json
new file mode 100644
index 0000000..9c4cd21
--- /dev/null
+++ b/config.json
@@ -0,0 +1,37 @@
+{
+  "urls": [
+    "https://raw.githubusercontent.com/PolishFiltersTeam/KADhosts/master/KADhosts.txt",
+    "https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.Spam/hosts",
+    "https://v.firebog.net/hosts/static/w3kbl.txt",
+    "https://adaway.org/hosts.txt",
+    "https://v.firebog.net/hosts/AdguardDNS.txt",
+    "https://v.firebog.net/hosts/Admiral.txt",
+    "https://raw.githubusercontent.com/anudeepND/blacklist/master/adservers.txt",
+    "https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt",
+    "https://v.firebog.net/hosts/Easylist.txt",
+    "https://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&mimetype=plaintext",
+    "https://raw.githubusercontent.com/FadeMind/hosts.extras/master/UncheckyAds/hosts",
+    "https://raw.githubusercontent.com/bigdargon/hostsVN/master/hosts",
+    "https://v.firebog.net/hosts/Easyprivacy.txt",
+    "https://v.firebog.net/hosts/Prigent-Ads.txt",
+    "https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.2o7Net/hosts",
+    "https://raw.githubusercontent.com/crazy-max/WindowsSpyBlocker/master/data/hosts/spy.txt",
+    "https://hostfiles.frogeye.fr/firstparty-trackers-hosts.txt",
+    "https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Alternate%20versions%20Anti-Malware%20List/AntiMalwareHosts.txt",
+    "https://osint.digitalside.it/Threat-Intel/lists/latestdomains.txt",
+    "https://s3.amazonaws.com/lists.disconnect.me/simple_malvertising.txt",
+    "https://v.firebog.net/hosts/Prigent-Crypto.txt",
+    "https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.Risk/hosts",
+    "https://bitbucket.org/ethanr/dns-blacklists/raw/8575c9f96e5b4a1308f2f12394abd86d0927a4a0/bad_lists/Mandiant_APT1_Report_Appendix_D.txt",
+    "https://phishing.army/download/phishing_army_blocklist_extended.txt",
+    "https://gitlab.com/quidsup/notrack-blocklists/raw/master/notrack-malware.txt",
+    "https://v.firebog.net/hosts/RPiList-Malware.txt",
+    "https://v.firebog.net/hosts/RPiList-Phishing.txt",
+    "https://raw.githubusercontent.com/Spam404/lists/master/main-blacklist.txt",
+    "https://raw.githubusercontent.com/AssoEchap/stalkerware-indicators/master/generated/hosts",
+    "https://urlhaus.abuse.ch/downloads/hostfile/",
+    "https://zerodot1.gitlab.io/CoinBlockerLists/hosts_browser"
+  ],
+  "update_on_startup": false,
+  "upstream_dns": "1.1.1.1"
+}
\ No newline at end of file
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..7c58a21
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,100 @@
+use std::{error::Error, io::{Write, Read}, fs::File};
+
+use serde::{Serialize, Deserialize};
+
+/// Struct containing configuration information
+#[derive(Serialize, Deserialize)]
+pub struct Config {
+    /// URLS of blacklists
+    pub urls: Vec<String>,
+
+    /// Wether to download blacklists again on startup
+    pub update_on_startup: bool,
+ 
+    /// Upstream DNS server
+    pub upstream_dns: String,
+}
+
+impl Config {
+    /// Saves config as JSON file
+    pub fn save(&self, path: &str) -> Result<(), Box<dyn Error>> {
+        println!("Saving config to file \"{}\"...", path);
+
+        // Serialize config into JSON String
+        let json_data = serde_json::to_string_pretty(&self)?;
+
+        // Create save file
+        let mut file = File::create(path)?;
+
+        // Convert JSON String to UTF-8 and encode and write JSON to file
+        file.write_all(json_data.as_bytes())?;
+
+        println!("Finished saving config!");
+
+        Ok(())
+    }
+
+    /// Loads config from file
+    pub fn load(path: &str) -> Result<Self, Box<dyn Error>> {
+        println!("Loading config from file \"{}\"...", path);
+
+        // Open file
+        let mut file = File::open(path)?;
+
+        // Create JSON data buffer
+        let mut json_data = String::new();
+        
+        // Read data into buffer
+        file.read_to_string(&mut json_data)?;
+
+        // Create Config struct
+        let config = serde_json::from_str(&json_data)?;
+
+        println!("Finished loading config!");
+
+        Ok(config)
+    }
+}
+
+impl Default for Config {
+    /// Default configuration
+    fn default() -> Self {
+        Config { 
+            urls: vec![
+                String::from("https://raw.githubusercontent.com/PolishFiltersTeam/KADhosts/master/KADhosts.txt"),
+                String::from("https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.Spam/hosts"),
+                String::from("https://v.firebog.net/hosts/static/w3kbl.txt"),
+                String::from("https://adaway.org/hosts.txt"),
+                String::from("https://v.firebog.net/hosts/AdguardDNS.txt"),
+                String::from("https://v.firebog.net/hosts/Admiral.txt"),
+                String::from("https://raw.githubusercontent.com/anudeepND/blacklist/master/adservers.txt"),
+                String::from("https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt"),
+                String::from("https://v.firebog.net/hosts/Easylist.txt"),
+                String::from("https://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&mimetype=plaintext"),
+                String::from("https://raw.githubusercontent.com/FadeMind/hosts.extras/master/UncheckyAds/hosts"),
+                String::from("https://raw.githubusercontent.com/bigdargon/hostsVN/master/hosts"),
+                String::from("https://v.firebog.net/hosts/Easyprivacy.txt"),
+                String::from("https://v.firebog.net/hosts/Prigent-Ads.txt"),
+                String::from("https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.2o7Net/hosts"),
+                String::from("https://raw.githubusercontent.com/crazy-max/WindowsSpyBlocker/master/data/hosts/spy.txt"),
+                String::from("https://hostfiles.frogeye.fr/firstparty-trackers-hosts.txt"),
+                String::from("https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Alternate%20versions%20Anti-Malware%20List/AntiMalwareHosts.txt"),
+                String::from("https://osint.digitalside.it/Threat-Intel/lists/latestdomains.txt"),
+                String::from("https://s3.amazonaws.com/lists.disconnect.me/simple_malvertising.txt"),
+                String::from("https://v.firebog.net/hosts/Prigent-Crypto.txt"),
+                String::from("https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.Risk/hosts"),
+                String::from("https://bitbucket.org/ethanr/dns-blacklists/raw/8575c9f96e5b4a1308f2f12394abd86d0927a4a0/bad_lists/Mandiant_APT1_Report_Appendix_D.txt"),
+                String::from("https://phishing.army/download/phishing_army_blocklist_extended.txt"),
+                String::from("https://gitlab.com/quidsup/notrack-blocklists/raw/master/notrack-malware.txt"),
+                String::from("https://v.firebog.net/hosts/RPiList-Malware.txt"),
+                String::from("https://v.firebog.net/hosts/RPiList-Phishing.txt"),
+                String::from("https://raw.githubusercontent.com/Spam404/lists/master/main-blacklist.txt"),
+                String::from("https://raw.githubusercontent.com/AssoEchap/stalkerware-indicators/master/generated/hosts"),
+                String::from("https://urlhaus.abuse.ch/downloads/hostfile/"),
+                String::from("https://zerodot1.gitlab.io/CoinBlockerLists/hosts_browser"),
+            ],
+            update_on_startup: false,
+            upstream_dns: String::from("1.1.1.1"),
+        }
+    }
+}
diff --git a/src/lists.rs b/src/lists.rs
new file mode 100644
index 0000000..0a3977d
--- /dev/null
+++ b/src/lists.rs
@@ -0,0 +1,123 @@
+use std::{collections::HashSet, error::Error, fs::File, io::prelude::*, vec};
+
+use flate2::{read::GzDecoder, write::GzEncoder, Compression};
+use futures::future;
+use reqwest::{self, Client};
+use serde::{Deserialize, Serialize};
+
+use crate::config::Config;
+
+/// Struct containing information about the blacklist
+#[derive(Serialize, Deserialize)]
+pub struct Blacklist {
+    pub list: HashSet<String>,
+}
+
+impl Blacklist {
+    /// Takes a [`&Config`] containing a list of blacklist URLs and returns a [`Blacklist`] containing blacklisted domain names.
+    pub fn create(config: &Config) -> Result<Self, Box<dyn Error>> {
+        println!("Creating blacklist...");
+
+        // Download unordered blacklists
+        let lists = Self::download_lists(&config)?;
+
+        // Join blacklists into one big list
+        let list = lists.join("\n");
+
+        // Parse blacklists and collect to HashSet<String>
+        let list: HashSet<_> = list
+            .lines()
+            .filter(|&line| !(line.starts_with("#") || line.is_empty()))
+            .map(|line| String::from(line.replace("0.0.0.0", "").replace("127.0.0.1", "").trim()))
+            .collect();
+
+        // Create Blacklist struct
+        let blacklist = Self { list };
+
+        println!("Finished creating blacklist...");
+
+        // Return blacklist
+        Ok(blacklist)
+    }
+
+    /// Takes a [`&Config`] containing a list of blacklist URLs and downloads blacklists asynchronously in an unordered fashion and returns a [`Vec<String>`]
+    /// where each [`String`] contains the raw text from the blacklist.
+    #[tokio::main]
+    async fn download_lists(config: &Config) -> Result<Vec<String>, Box<dyn Error>> {
+        println!("Downloading blacklists...");
+
+        // Create request client
+        let client = Client::new();
+
+        // Get responses asynchronously
+        let responses = future::join_all(config.urls.clone().into_iter().map(|url| {
+            let client = &client;
+            async move {
+                let resp: reqwest::Response = client.get(url).send().await?;
+                resp.text().await
+            }
+        }))
+        .await;
+
+        // Create list of texts
+        let mut texts = vec![];
+
+        // Extract text from each blacklist
+        for response in responses {
+            match response {
+                Ok(t) => {
+                    texts.push(t);
+                }
+                Err(e) => eprintln!("Got an error: {}", e),
+            }
+        }
+
+        // Return texts
+        Ok(texts)
+    }
+
+    /// Saves information of [`Blacklist`] to a file and compresses it.
+    pub fn save(&self, path: &str) -> Result<(), Box<dyn Error>> {
+        println!("Saving blacklist to file \"{}\"...", path);
+
+        // Serialize Blacklist into JSON String
+        let json_data = serde_json::to_string(&self)?;
+
+        // Create save file
+        let file = File::create(path)?;
+
+        // Create gzip encoder with default compression level
+        let mut encoder = GzEncoder::new(file, Compression::default());
+
+        // Convert JSON String to UTF-8 and encode and write JSON to file
+        encoder.write_all(json_data.as_bytes())?;
+
+        println!("Finished saving blacklist!");
+
+        Ok(())
+    }
+
+    /// Loads compressed information from file into a [`Blacklist`].
+    pub fn load(path: &str) -> Result<Blacklist, Box<dyn Error>> {
+        println!("Loading blacklist from file \"{}\"...", path);
+
+        // Open blacklist file
+        let file = File::open(path)?;
+
+        // Create a decoder
+        let mut decoder = GzDecoder::new(file);
+
+        // Create JSON data buffer
+        let mut json_data = String::new();
+
+        // Read data into JSON buffer
+        decoder.read_to_string(&mut json_data)?;
+
+        // Create blacklist struct
+        let blacklist = serde_json::from_str(&json_data)?;
+
+        println!("Finished loading blacklist!");
+
+        Ok(blacklist)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..13fcf39
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,44 @@
+mod server;
+mod lists;
+mod config;
+
+use config::Config;
+use lists::Blacklist;
+
+fn main() {
+    // Path for storing config file
+    let config_path = "config.json";
+
+    // Creates config
+    let config = match Config::load(config_path) {
+        Ok(c) => c,
+        Err(_) => {
+            println!("Using default config!");
+            let cfg = Config::default();
+            let _ = cfg.save(config_path);
+            cfg
+        }
+    };
+
+    // Path for storing compressed blacklist file
+    let blacklist_path = "blacklist.gz";
+
+    // Creates blacklist
+    let blacklist = if config.update_on_startup == false {
+        match Blacklist::load(blacklist_path) {
+            Ok(b) => b,
+            Err(_) => {
+                let bl = Blacklist::create(&config).unwrap();
+                let _ = bl.save(blacklist_path);
+                bl
+            },
+        }
+    } else {
+        let bl = Blacklist::create(&config).unwrap();
+        let _ = bl.save(blacklist_path);
+        bl
+    };
+
+    // Starts server
+    server::server(&blacklist, &config).unwrap();
+}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..23c86db
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,152 @@
+use crate::{lists::Blacklist, config::Config};
+
+use std::{
+    error::Error,
+    net::{SocketAddr, UdpSocket, IpAddr},
+    str::FromStr,
+};
+
+use domain::{
+    self,
+    base::{
+        iana::{Class, Rcode},
+        Message, MessageBuilder, Record, ToDname, Ttl
+    },
+    rdata::A,
+};
+
+/// Struct to hold the recv_addr query id and
+#[derive(Debug)]
+struct Request {
+    addr: SocketAddr,
+    id: u16,
+}
+
+/// Takes a DNS request and builds an answer that returns the address 0.0.0.0
+fn build_answer(message: &Message<Vec<u8>>) -> Vec<u8> {
+    // Create DNS message builder and turn it into an answer builder for the DNS request
+    let mut builder = MessageBuilder::new_vec()
+        .start_answer(message, Rcode::NoError)
+        .unwrap();
+
+    // For each question in message
+    for question in message.question() {
+        // Get domain name
+        let dname = question.unwrap().qname().to_dname::<Vec<_>>().unwrap();
+
+        // Create record for answer with address 0.0.0.0
+        let record = Record::new(
+            dname,
+            Class::In,
+            Ttl::from_secs(86400),
+            A::from_octets(0, 0, 0, 0),
+        );
+
+        // Add record to answer builder
+        builder.push(record).unwrap();
+    }
+
+    // Convert answer builder to vector of bytes and return
+    builder.finish()
+}
+
+/// Takes a reference to a [`Blacklist`] and starts server loop
+pub fn server(list: &Blacklist, config: &Config) -> Result<(), Box<dyn Error>> {
+    println!("Starting DNS server...");
+
+    // Buffer size of DNS message buffer
+    let buffer_size = 1024;
+
+    // Address of UDP socket
+    let socket_addr = "0.0.0.0:53";
+
+    // Create UDP socket
+    let socket: UdpSocket = UdpSocket::bind(socket_addr)?;
+
+    // Address of upstream DNS server
+    let dns_addr = IpAddr::from_str(config.upstream_dns.as_str())?;
+
+    // Upstream DNS server as SocketAddr
+    let dns_sock_addr = SocketAddr::new(dns_addr, 53);
+
+    // DNS request que
+    let mut requests: Vec<Request> = vec![];
+
+    loop {
+        // Reset buffer
+        let mut buf = vec![0; buffer_size];
+
+        // Get DNS request from devices
+        let (size, recv_addr) = socket.recv_from(&mut buf)?;
+
+        // Remove trailing zeros from buffer
+        buf.truncate(size);
+
+        // Construct DNS message from buffer
+        let message = Message::from_octets(buf.clone())?;
+
+        // If messages comes from upstream DNS server (which means that the message is a response)
+        if recv_addr == dns_sock_addr {
+            // Finds DNS request and its index in the request que that has a matching transaction id (because we need its address so we know where to send the response and its index to remove it from the que)
+            let request = requests
+                .iter()
+                .enumerate()
+                .find(|(_index, req)| req.id == message.header().id());
+
+            // Check if the request and its index were found. If not continue...
+            let (index, request) = match request {
+                Some(r) => r,
+                None => continue,
+            };
+
+            // Send response from upstream DNS server to requesting device
+            socket.send_to(&buf, request.addr)?;
+
+            // Remove request from the requests que
+            requests.swap_remove(index);
+        } else {
+            // Get questions from DNS request
+            let questions: Vec<_> = message.question().collect();
+
+            // Whether blacklist contains domains from any of the questions
+            let filter = questions.iter().any(|&q| {
+                // Get domain name from question
+                let domain = q.unwrap().qname().to_string();
+
+                // Check if blacklist contains domain name
+                list.list.contains(&domain)
+            });
+
+            if filter {
+                // Builds an answer with address 0.0.0.0
+                let answer = build_answer(&message);
+
+                // Sends answer to requesting device
+                socket.send_to(&answer, recv_addr)?;
+
+                println!(
+                    "{} filtered domain: {}",
+                    recv_addr.ip(),
+                    message.first_question().unwrap().qname().to_string(),
+                );
+
+                continue;
+            } else {
+                println!(
+                    "{} requested domain: {}",
+                    recv_addr.ip(),
+                    message.first_question().unwrap().qname().to_string(),
+                );
+            }
+
+            // Add request to requests que
+            requests.push(Request {
+                addr: recv_addr,
+                id: message.header().id(),
+            });
+
+            // Send request to upstream DNS server
+            socket.send_to(&buf, dns_sock_addr)?;
+        }
+    }
+}