From 87e9eed8abf304927bb6fdab9c3d05be5a0cf1ac Mon Sep 17 00:00:00 2001
From: Jan-Bulthuis <git@bulthuis.dev>
Date: Sat, 9 Aug 2025 18:20:11 +0200
Subject: [PATCH] feat: Initial functionality

---
 .gitignore  |    1 +
 Cargo.lock  | 2783 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   23 +
 README.md   |    3 +
 client.sh   |   30 +
 madd.toml   |   22 +
 src/api.rs  |  190 ++++
 src/dns.rs  |  472 +++++++++
 src/main.rs |   83 ++
 9 files changed, 3607 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100755 client.sh
 create mode 100644 madd.toml
 create mode 100644 src/api.rs
 create mode 100644 src/dns.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f97022
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+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..8a86611
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5312722
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "madd"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+axum = "0.8.4"
+base64ct = { version = "1.8.0", features = ["std", "alloc"] }
+clap = { version = "4.5.43", features = ["derive"] }
+dns-update = "0.1.5"
+env_logger = "0.11.8"
+ipnet = { version = "2.11.0", features = ["serde"] }
+log = "0.4.27"
+rand = "0.9.2"
+serde = { version = "1.0.219", features = ["derive"] }
+ssh-key = { version = "0.6.7", features = [
+    "serde",
+    "ed25519",
+    "rsa",
+    "crypto",
+] }
+tokio = { version = "1.47.1", features = ["full"] }
+toml = "0.9.5"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..18caa13
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Machine Authenticated Dynamic DNS
+
+Machines can authenticate themselves to MADD using their SSH host key and a challenge response system. When authenticated the MADD server updates their hostname in a DNS server supporting RFC2316 Dynamic DNS updates.
\ No newline at end of file
diff --git a/client.sh b/client.sh
new file mode 100755
index 0000000..5c0086a
--- /dev/null
+++ b/client.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+private_key="${MADD_PRIV_KEY:-"/etc/ssh/ssh_host_ed25519_key"}"
+public_key="${MADD_PUB_KEY:-"$private_key.pub"}"
+
+hostname="${MADD_HOSTNAME:-"$(hostname -s)"}"
+requested_ip=$MADD_IP # TODO: Obtain IP automatically
+
+endpoint=$MADD_ENDPOINT
+
+echo "(MADD) Updating DNS..."
+echo
+echo " Endpoint: $endpoint"
+echo "Priv. key: $private_key"
+echo " Pub. key: $public_key"
+echo " Hostname: $hostname"
+echo "       IP: $requested_ip" 
+echo
+
+# Generate the request and receive the identifier to sign
+identifier=$(curl "$endpoint/request/$hostname/$requested_ip" --fail-with-body --data-binary @$public_key 2>/dev/null)
+
+# Sign the request using the SSH key
+signed=$(echo -n "$identifier $hostname $requested_ip" | ssh-keygen -Y sign -f $private_key -n madd 2>/dev/null)
+
+# Escape slashes in the identifier
+identifier_escaped=$(sed "s|/|%2F|g" <<< "$identifier")
+
+# Submit the signed request
+curl "$endpoint/signed/$identifier_escaped" --fail-with-body --data "$signed"
\ No newline at end of file
diff --git a/madd.toml b/madd.toml
new file mode 100644
index 0000000..8c7fa36
--- /dev/null
+++ b/madd.toml
@@ -0,0 +1,22 @@
+# Socket address to bind the MADD server to
+bind = "127.0.0.1:3000"
+
+# DNS zone under which the hosts are registered
+zone = "lab.example.com"
+
+# List of subnets where hosts can register hostnames to
+networks = ["10.0.0.0/8"]
+
+# Maximum number of self-registrations allowed per host key
+registration_limit = 1
+
+# DNS server to use for registration, must support RFC 2136
+dns_server = "127.0.0.1:53"
+
+# TSIG key configuration for DNS updates
+tsig_key_name = "madd"
+tsig_key_file = "/etc/madd/madd.tsig"
+tsig_algorithm = "hmac-sha256"
+
+# Directory to store data files, must be writable by the user running MADD
+data_dir = "/var/lib/madd"
diff --git a/src/api.rs b/src/api.rs
new file mode 100644
index 0000000..ecdb582
--- /dev/null
+++ b/src/api.rs
@@ -0,0 +1,190 @@
+use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+
+use axum::{
+    extract::{ConnectInfo, Path, State},
+    http::StatusCode,
+    response::IntoResponse,
+    routing::post,
+};
+use base64ct::{Base64, Encoding};
+use log::{info, warn};
+use ssh_key::{PublicKey, SshSig};
+use tokio::{
+    sync::{mpsc, oneshot},
+    task::JoinHandle,
+    time::Instant,
+};
+
+use crate::{
+    Config,
+    dns::{Command, CreateRequest, DNSRequest, Identifier, RequestError, SignRequest},
+};
+
+#[derive(Clone)]
+struct ServerState {
+    cmd_tx: mpsc::Sender<Command>,
+}
+
+pub async fn start_server(tx: mpsc::Sender<Command>, config: &Config) -> JoinHandle<()> {
+    let state = ServerState { cmd_tx: tx };
+
+    let router = axum::Router::new()
+        .route("/request/{hostname}/{ip_addr}", post(create_request))
+        .route("/signed/{identifier}", post(signed_request))
+        .with_state(state);
+
+    let listener = tokio::net::TcpListener::bind(config.bind).await.unwrap();
+
+    let join_handle = tokio::spawn(async move {
+        match axum::serve(
+            listener,
+            router.into_make_service_with_connect_info::<SocketAddr>(),
+        )
+        .into_future()
+        .await
+        {
+            Ok(_) => todo!(),
+            Err(_) => todo!(),
+        }
+    });
+
+    info!("MADD running on http://{}", config.bind);
+
+    join_handle
+}
+
+async fn create_request(
+    ConnectInfo(connect_info): ConnectInfo<SocketAddr>,
+    Path((hostname, requested_ip)): Path<(String, Ipv4Addr)>,
+    State(state): State<ServerState>,
+    body: String,
+) -> impl IntoResponse {
+    let host_ip = match connect_info.ip() {
+        IpAddr::V4(ipv4_addr) => ipv4_addr,
+        IpAddr::V6(ipv6_addr) => {
+            return (
+                StatusCode::BAD_REQUEST,
+                format!("Access from ipv6 address {ipv6_addr} not allowed"),
+            );
+        }
+    };
+
+    // Parse SSH public key
+    let ssh_key = match PublicKey::from_openssh(&body) {
+        Ok(key) => key,
+        Err(e) => {
+            warn!("Failed to parse public key submitted by client {connect_info}: {e}");
+            return (StatusCode::BAD_REQUEST, String::from("Invalid public key"));
+        }
+    };
+
+    // Create request
+    let (tx, rx) = oneshot::channel();
+    let request = Command::CreateRequest(Box::new(CreateRequest {
+        request: DNSRequest {
+            hostname,
+            time: Instant::now(),
+            ssh_key,
+            requested_ip,
+            host_ip,
+        },
+        response_channel: tx,
+    }));
+    let _ = state.cmd_tx.send(request).await;
+
+    let identifier = match rx.await {
+        Ok(res) => res,
+        Err(e) => unreachable!("Oneshot response channel sender was dropped unexpectedly: {e}"),
+    };
+
+    let encoded = identifier.to_base64();
+
+    (StatusCode::OK, encoded)
+}
+
+async fn signed_request(
+    ConnectInfo(connect_info): ConnectInfo<SocketAddr>,
+    Path(identifier): Path<String>,
+    State(state): State<ServerState>,
+    body: String,
+) -> impl IntoResponse {
+    let host_ip = match connect_info.ip() {
+        IpAddr::V4(ipv4_addr) => ipv4_addr,
+        IpAddr::V6(ipv6_addr) => {
+            return (
+                StatusCode::BAD_REQUEST,
+                format!("Access from ipv6 address {ipv6_addr} not allowed"),
+            );
+        }
+    };
+
+    // Decode the identifier
+    let mut bytes = [0; 256];
+    match Base64::decode(identifier, &mut bytes) {
+        Ok(_) => (), // TODO: Check for length?
+        Err(_) => todo!(),
+    }
+    let identifier = Identifier(bytes);
+
+    // Read the signed value
+    let signed = match SshSig::from_pem(&body) {
+        Ok(sig) => sig,
+        Err(e) => {
+            warn!("Failed to parse ssh signature submitted by client {connect_info}: {e}");
+            return (StatusCode::BAD_REQUEST, String::from("Bad SSH signature"));
+        }
+    };
+
+    // Create request
+    let (tx, rx) = oneshot::channel();
+    let request = Command::SignRequest(Box::new(SignRequest {
+        identifier,
+        signed,
+        time: Instant::now(),
+        host_ip,
+        response_channel: tx,
+    }));
+
+    let _ = state.cmd_tx.send(request).await;
+
+    match rx.await {
+        Ok(res) => match res {
+            Ok(_) => (
+                StatusCode::OK,
+                String::from("Request fulfilled successfully"),
+            ),
+            Err(e) => match e {
+                RequestError::HostIpMismatch => (
+                    StatusCode::BAD_REQUEST,
+                    String::from(
+                        "Signed request must be submitted from the same host that created the request",
+                    ),
+                ),
+                RequestError::InvalidSignature => (
+                    StatusCode::BAD_REQUEST,
+                    String::from("Invalid SSH signature"),
+                ),
+                RequestError::RequestExpired => {
+                    (StatusCode::FORBIDDEN, String::from("Request expired"))
+                }
+                RequestError::RequestedIpNotAllowed => (
+                    StatusCode::BAD_REQUEST,
+                    String::from("Requested IP not allowed"),
+                ),
+                RequestError::UpdateFailed => (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    String::from("Failed to update DNS record"),
+                ),
+                RequestError::AlreadyRegistered => (
+                    StatusCode::FORBIDDEN,
+                    String::from("Hostname already registered by another host"),
+                ),
+                RequestError::TooManyRegistrations => (
+                    StatusCode::FORBIDDEN,
+                    String::from("Registration limit reached"),
+                ),
+            },
+        },
+        Err(e) => unreachable!("Oneshot response channel sender was dropped unexpectedly: {e}"),
+    }
+}
diff --git a/src/dns.rs b/src/dns.rs
new file mode 100644
index 0000000..1fb012c
--- /dev/null
+++ b/src/dns.rs
@@ -0,0 +1,472 @@
+use std::{
+    collections::HashMap, hash::Hash, net::Ipv4Addr, ops::Deref, str::FromStr, time::Duration,
+};
+
+use base64ct::{Base64, Encoding};
+use dns_update::DnsUpdater;
+use log::{error, info, warn};
+use rand::{Rng, SeedableRng, rngs::StdRng};
+use serde::{Deserialize, Serialize, de};
+use ssh_key::{PublicKey, SshSig};
+use tokio::{
+    sync::{mpsc, oneshot},
+    task::JoinHandle,
+    time::Instant,
+};
+
+use crate::Config;
+
+// const MAX_HOSTNAME_LENGTH: usize = 15;
+
+// #[derive(Debug)]
+// pub struct Hostname(String);
+// impl Deref for Hostname {
+//     type Target = String;
+//     fn deref(&self) -> &Self::Target {
+//         &self.0
+//     }
+// }
+// impl ser::Serialize for Hostname {
+//     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+//     where
+//         S: ser::Serializer,
+//     {
+//         serializer.serialize_str(&self.0)
+//     }
+// }
+// impl<'de> de::Deserialize<'de> for Hostname {
+//     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+//     where
+//         D: serde::Deserializer<'de>,
+//     {
+//         <String as de::Deserialize>::deserialize(deserializer).and_then(|inner| {
+//             if inner.len() > MAX_HOSTNAME_LENGTH {
+//                 Err(de::Error::invalid_length(
+//                     inner.len(),
+//                     &"a shorter hostname",
+//                 ))
+//             } else {
+//                 Ok(Self(inner))
+//             }
+//         })
+//     }
+// }
+
+#[derive(Debug, Clone)]
+pub struct DnsAddress(dns_update::providers::rfc2136::DnsAddress);
+impl Deref for DnsAddress {
+    type Target = dns_update::providers::rfc2136::DnsAddress;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl<'de> Deserialize<'de> for DnsAddress {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        <String as de::Deserialize>::deserialize(deserializer).and_then(|inner| {
+            match dns_update::providers::rfc2136::DnsAddress::try_from(&inner) {
+                Ok(addr) => Ok(DnsAddress(addr)),
+                Err(_) => Err(de::Error::custom(format!("Invalid DNS address: {inner}"))),
+            }
+        })
+    }
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct Registrations(HashMap<String, Registration>);
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct Registration {
+    pub ip: Ipv4Addr,
+    pub public_key: PublicKey,
+}
+
+pub struct TsigAlgorithm(dns_update::TsigAlgorithm);
+impl Deref for TsigAlgorithm {
+    type Target = dns_update::TsigAlgorithm;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl<'de> Deserialize<'de> for TsigAlgorithm {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        <String as de::Deserialize>::deserialize(deserializer).and_then(|inner| {
+            match dns_update::TsigAlgorithm::from_str(&inner) {
+                Ok(algorithm) => Ok(TsigAlgorithm(algorithm)),
+                Err(_) => Err(de::Error::unknown_variant(
+                    &inner,
+                    &[
+                        "hmac-md5",
+                        "gss",
+                        "hmac-sha1",
+                        "hmac-sha224",
+                        "hmac-sha256",
+                        "hmac-sha256-128",
+                        "hmac-sha384",
+                        "hmac-sha384-192",
+                        "hmac-sha512",
+                        "hmac-sha512-256",
+                    ],
+                )),
+            }
+        })
+    }
+}
+impl std::fmt::Debug for TsigAlgorithm {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let algorithm_name = match self.0 {
+            dns_update::TsigAlgorithm::HmacMd5 => "hmac-md5",
+            dns_update::TsigAlgorithm::Gss => "gss",
+            dns_update::TsigAlgorithm::HmacSha1 => "hmac-sha1",
+            dns_update::TsigAlgorithm::HmacSha224 => "hmac-sha224",
+            dns_update::TsigAlgorithm::HmacSha256 => "hmac-sha256",
+            dns_update::TsigAlgorithm::HmacSha256_128 => "hmac-sha256-128",
+            dns_update::TsigAlgorithm::HmacSha384 => "hmac-sha384",
+            dns_update::TsigAlgorithm::HmacSha384_192 => "hmac-sha384-192",
+            dns_update::TsigAlgorithm::HmacSha512 => "hmac-sha512",
+            dns_update::TsigAlgorithm::HmacSha512_256 => "hmac-sha512-256",
+        };
+        write!(f, "{algorithm_name}")
+    }
+}
+impl Clone for TsigAlgorithm {
+    fn clone(&self) -> Self {
+        Self(match self.0 {
+            dns_update::TsigAlgorithm::HmacMd5 => dns_update::TsigAlgorithm::HmacMd5,
+            dns_update::TsigAlgorithm::Gss => dns_update::TsigAlgorithm::Gss,
+            dns_update::TsigAlgorithm::HmacSha1 => dns_update::TsigAlgorithm::HmacSha1,
+            dns_update::TsigAlgorithm::HmacSha224 => dns_update::TsigAlgorithm::HmacSha224,
+            dns_update::TsigAlgorithm::HmacSha256 => dns_update::TsigAlgorithm::HmacSha256,
+            dns_update::TsigAlgorithm::HmacSha256_128 => dns_update::TsigAlgorithm::HmacSha256_128,
+            dns_update::TsigAlgorithm::HmacSha384 => dns_update::TsigAlgorithm::HmacSha384,
+            dns_update::TsigAlgorithm::HmacSha384_192 => dns_update::TsigAlgorithm::HmacSha384_192,
+            dns_update::TsigAlgorithm::HmacSha512 => dns_update::TsigAlgorithm::HmacSha512,
+            dns_update::TsigAlgorithm::HmacSha512_256 => dns_update::TsigAlgorithm::HmacSha512_256,
+        })
+    }
+}
+
+#[derive(Hash, PartialEq, Eq, Clone)]
+pub struct Identifier(pub [u8; 256]);
+impl Deref for Identifier {
+    type Target = [u8; 256];
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl Identifier {
+    pub fn to_base64(&self) -> String {
+        Base64::encode_string(&self.0)
+    }
+}
+
+pub enum Command {
+    CreateRequest(Box<CreateRequest>),
+    SignRequest(Box<SignRequest>),
+}
+
+#[derive(Clone)]
+pub struct DNSRequest {
+    pub hostname: String,
+    pub time: Instant,
+    pub ssh_key: PublicKey,
+    // TODO: Handle Ipv6
+    pub requested_ip: Ipv4Addr,
+    pub host_ip: Ipv4Addr,
+}
+
+pub struct CreateRequest {
+    pub request: DNSRequest,
+    pub response_channel: oneshot::Sender<Identifier>,
+}
+
+pub struct SignRequest {
+    pub identifier: Identifier,
+    pub signed: SshSig,
+    pub time: Instant,
+    pub host_ip: Ipv4Addr,
+    pub response_channel: oneshot::Sender<Result<(), RequestError>>,
+}
+
+#[derive(Debug, Clone)]
+pub enum RequestError {
+    HostIpMismatch,
+    RequestExpired,
+    InvalidSignature,
+    RequestedIpNotAllowed,
+    UpdateFailed,
+    AlreadyRegistered,
+    TooManyRegistrations,
+}
+
+pub async fn start_client(rx: mpsc::Receiver<Command>, config: &Config) -> JoinHandle<()> {
+    tokio::spawn(run_client(rx, config.clone()))
+}
+
+struct ClientState {
+    config: Config,
+    requests: HashMap<Identifier, DNSRequest>,
+    dns_updater: DnsUpdater,
+    registrations: Registrations,
+}
+
+async fn run_client(rx: mpsc::Receiver<Command>, config: Config) {
+    let mut rx = rx;
+    let requests = HashMap::new();
+    let dns_updater = get_dns_updater(&config);
+    let registrations = init_registrations(&config).await;
+
+    init_dns_registrations(&registrations, &config, &dns_updater).await;
+
+    let mut state = ClientState {
+        config,
+        requests,
+        dns_updater,
+        registrations,
+    };
+    loop {
+        match rx.recv().await {
+            Some(cmd) => handle_cmd(cmd, &mut state).await,
+            None => return,
+        };
+    }
+}
+
+async fn init_registrations(config: &Config) -> Registrations {
+    let path = config.data_dir.join("registrations.toml");
+    if !path.exists() {
+        return Registrations(HashMap::new());
+    }
+
+    let contents = tokio::fs::read_to_string(path).await.unwrap();
+    match toml::from_str(&contents) {
+        Ok(registrations) => registrations,
+        Err(e) => {
+            panic!("Failed to parse registrations file: {e}");
+        }
+    }
+}
+
+async fn init_dns_registrations(
+    registrations: &Registrations,
+    config: &Config,
+    updater: &DnsUpdater,
+) {
+    for (hostname, registration) in registrations.0.iter() {
+        execute_dns_update(hostname, &registration.ip, config, updater)
+            .await
+            .unwrap();
+    }
+}
+
+async fn write_registrations(registrations: &Registrations, config: &Config) {
+    let path = config.data_dir.join("registrations.toml");
+    let contents = toml::to_string(registrations).unwrap();
+    tokio::fs::write(path, contents).await.unwrap();
+}
+
+fn get_dns_updater(config: &Config) -> DnsUpdater {
+    let addr = format!("tcp://{}", config.dns_server);
+    let key_name = &config.tsig_key_name;
+    let key = match std::fs::read_to_string(&config.tsig_key_file) {
+        Ok(contents) => Base64::decode_vec(&contents).unwrap(),
+        Err(e) => panic!("Failed to read TSIG key file: {e}"),
+    };
+    let algorithm = config.tsig_algorithm.clone().0;
+    info!("Creating DNS client for {addr}");
+    dns_update::DnsUpdater::new_rfc2136_tsig(addr, key_name, key, algorithm)
+        .expect("Failed to create DNS client")
+}
+
+async fn handle_cmd(cmd: Command, state: &mut ClientState) {
+    match cmd {
+        Command::CreateRequest(create_request) => {
+            handle_create_request(*create_request, state).await
+        }
+        Command::SignRequest(sign_request) => handle_sign_request(*sign_request, state).await,
+    }
+}
+
+async fn handle_create_request(request: CreateRequest, state: &mut ClientState) {
+    let random_value: [u8; 256] = StdRng::from_os_rng().random();
+    let identifier = Identifier(random_value);
+    state
+        .requests
+        .insert(identifier.clone(), request.request.clone());
+    let _ = request.response_channel.send(identifier);
+    info!(
+        "Registered host update request for {} to {} from {}.",
+        &request.request.hostname, &request.request.requested_ip, &request.request.host_ip
+    )
+}
+
+async fn handle_sign_request(request: SignRequest, state: &mut ClientState) {
+    let dns_request = match state.requests.remove(&request.identifier) {
+        Some(req) => req,
+        None => todo!(),
+    };
+
+    // The request must be submitted and signed by the same host
+    if dns_request.host_ip != request.host_ip {
+        warn!(
+            "Host IP mismatch for signed request for host {}: expected from {}, received from {}",
+            dns_request.hostname, dns_request.host_ip, request.host_ip
+        );
+        let _ = request
+            .response_channel
+            .send(Err(RequestError::HostIpMismatch));
+        return;
+    }
+
+    // The requested IP must be within the allowed networks
+    if !state
+        .config
+        .networks
+        .iter()
+        .any(|net| net.contains(&dns_request.requested_ip))
+    {
+        warn!(
+            "Requested IP {} for host {} is not allowed",
+            dns_request.requested_ip, dns_request.hostname
+        );
+        let _ = request
+            .response_channel
+            .send(Err(RequestError::RequestedIpNotAllowed));
+        return;
+    }
+
+    // The signed request must be submitted within 10 seconds of request creation
+    if request.time - dns_request.time > Duration::from_secs(10) {
+        warn!("Request expired: signed request is older than 10 seconds");
+        let _ = request
+            .response_channel
+            .send(Err(RequestError::RequestExpired));
+        return;
+    }
+
+    // Verify the SSH signature
+    let original_text = format!(
+        "{} {} {}",
+        request.identifier.to_base64(),
+        dns_request.hostname,
+        dns_request.requested_ip
+    );
+    match dns_request
+        .ssh_key
+        .verify("madd", original_text.as_bytes(), &request.signed)
+    {
+        Ok(_) => (),
+        Err(e) => {
+            warn!(
+                "Failed to verify SSH signature for host {}: {}",
+                dns_request.hostname, e
+            );
+            let _ = request
+                .response_channel
+                .send(Err(RequestError::InvalidSignature));
+            return;
+        }
+    }
+
+    // Check with the registrations if the hostname has not already been registered
+    if let Some(registration) = state.registrations.0.get(&dns_request.hostname)
+        && registration.public_key.key_data() != dns_request.ssh_key.key_data()
+    {
+        warn!(
+            "Host {} attempted to register {} which has already been registered by a different host",
+            dns_request.host_ip, dns_request.hostname
+        );
+        let _ = request
+            .response_channel
+            .send(Err(RequestError::AlreadyRegistered));
+        return;
+    }
+
+    // Restrict the number of self-registrations per host
+    if !state.registrations.0.contains_key(&dns_request.hostname)
+        && state
+            .registrations
+            .0
+            .iter()
+            .filter(|(_, registration)| {
+                registration.public_key.key_data() == dns_request.ssh_key.key_data()
+            })
+            .count()
+            >= state.config.registration_limit
+    {
+        warn!(
+            "Host {} attempted to register {} but has already reached the registration limit",
+            dns_request.host_ip, dns_request.hostname
+        );
+        let _ = request
+            .response_channel
+            .send(Err(RequestError::TooManyRegistrations));
+        return;
+    }
+
+    // Create the registration
+    state.registrations.0.insert(
+        dns_request.hostname.clone(),
+        Registration {
+            ip: dns_request.requested_ip,
+            public_key: dns_request.ssh_key,
+        },
+    );
+    write_registrations(&state.registrations, &state.config).await;
+
+    // Execute the DNS update request
+    match execute_dns_update(
+        &dns_request.hostname,
+        &dns_request.requested_ip,
+        &state.config,
+        &state.dns_updater,
+    )
+    .await
+    {
+        Ok(_) => (),
+        Err(e) => {
+            let _ = request.response_channel.send(Err(e));
+            return;
+        }
+    };
+
+    let _ = request.response_channel.send(Ok(()));
+    info!(
+        "Executed host update request for {} to {} from {}.",
+        &dns_request.hostname, &dns_request.requested_ip, &dns_request.host_ip
+    )
+}
+
+async fn execute_dns_update(
+    hostname: &String,
+    ip: &Ipv4Addr,
+    config: &Config,
+    updater: &DnsUpdater,
+) -> Result<(), RequestError> {
+    let name = &format!("{}.{}", hostname, config.zone);
+    let record = dns_update::DnsRecord::A { content: *ip };
+    let ttl = 60;
+    let origin = &config.zone;
+    match updater
+        .delete(name, origin, dns_update::DnsRecordType::A)
+        .await
+    {
+        Ok(_) => (),
+        Err(e) => {
+            error!("Failed to delete existing DNS record: {e}");
+            return Err(RequestError::UpdateFailed);
+        }
+    };
+    match updater.create(name, record, ttl, origin).await {
+        Ok(_) => Ok(()),
+        Err(e) => {
+            error!("Failed to create DNS record: {e}");
+            Err(RequestError::UpdateFailed)
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b1f1956
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,83 @@
+use clap::Parser;
+use dns::TsigAlgorithm;
+use ipnet::Ipv4Net;
+use log::{debug, info};
+use serde::Deserialize;
+use std::{net::SocketAddr, path::PathBuf};
+use tokio::sync::mpsc;
+
+mod api;
+mod dns;
+
+/// Machine Authenticated Dynamic DNS (MADD)
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Path to configuration file
+    #[arg(short, long, default_value = "/etc/madd/madd.toml")]
+    config_file: PathBuf,
+
+    /// Log level (e.g., info, debug, error). Can also be set via the LOG_LEVEL environment variable
+    #[arg(short, long, default_value = "info")]
+    log_level: String,
+}
+
+fn get_args() -> Args {
+    Args::parse()
+}
+
+fn init_logging(args: &Args) {
+    let env = env_logger::Env::new()
+        .filter("LOG_LEVEL")
+        .default_filter_or(args.log_level.clone())
+        .write_style("LOG_STYLE");
+    env_logger::init_from_env(env);
+}
+
+#[derive(Deserialize, Debug, Clone)]
+struct Config {
+    bind: SocketAddr,
+    zone: String,
+    networks: Vec<Ipv4Net>,
+    registration_limit: usize,
+    data_dir: PathBuf,
+    dns_server: SocketAddr,
+    tsig_key_name: String,
+    tsig_key_file: PathBuf,
+    tsig_algorithm: TsigAlgorithm,
+}
+
+fn get_config(args: &Args) -> Config {
+    let path = &args.config_file;
+    let file_contents = match std::fs::read_to_string(path) {
+        Ok(contents) => contents,
+        Err(e) => panic!(
+            "Failed to read config file from \"{}\": {e}",
+            path.display()
+        ),
+    };
+    match toml::from_str(&file_contents) {
+        Ok(config) => config,
+        Err(e) => panic!("Failed to parse config file: {e}"),
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    // Parse command line arguments
+    let args = get_args();
+
+    // Initialize logging
+    init_logging(&args);
+    info!("Starting MADD");
+
+    // Gather configuration
+    let config = get_config(&args);
+    debug!("{config:?}");
+
+    // Start DNS client and API server
+    let (tx, rx) = mpsc::channel(16);
+    let handle_client = dns::start_client(rx, &config).await;
+    let handle_server = api::start_server(tx, &config).await;
+    let _ = (handle_client.await.unwrap(), handle_server.await.unwrap());
+}