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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..6371c05
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "dyndns"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0"
+arrayref = "0.3.6"
+inwx = { version = "0.1.0", git = "https://github.com/HimbeerserverDE/inwx-rs.git" }
+preferred-ip = { version = "0.1.0", git = "https://github.com/HimbeerserverDE/preferred-ip.git" }
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a348b09
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 HimbeerserverDE
+
+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.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6fa7b7f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# dyndns
+
+A dynamic DNS client using the INWX XML-RPC API, written in Rust.
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c11071a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,225 @@
+use std::net::{Ipv4Addr, Ipv6Addr};
+use std::str::FromStr;
+use std::sync::mpsc;
+use std::thread;
+use std::time::Duration;
+
+use arrayref::array_ref;
+use inwx::call::nameserver::{RecordInfo as RecordInfoCall, RecordUpdate};
+use inwx::common::nameserver::RecordType;
+use inwx::response::nameserver::RecordInfo as RecordInfoResponse;
+use inwx::{Client, Endpoint};
+
+#[derive(Clone, Copy, Debug)]
+struct Config<'a> {
+    user: &'a str,
+    pass: &'a str,
+    records4: &'a [i32],
+    records6: &'a [i32],
+    prefix_len: u32,
+    link4: &'a str,
+    link6: &'a str,
+    interval4: Duration,
+    interval6: Duration,
+}
+
+fn main() -> anyhow::Result<()> {
+    let config = Config {
+        user: "inwxclient",
+        pass: "inwx1@client",
+        records4: &[75506],
+        records6: &[75503],
+        prefix_len: 56,
+        link4: "wlan0",
+        link6: "wlan0",
+        interval4: Duration::from_secs(30),
+        interval6: Duration::from_secs(30),
+    };
+
+    let (tx4, rx4) = mpsc::channel();
+    let (tx6, rx6) = mpsc::channel();
+
+    let push4_thread = thread::spawn(move || {
+        push4(config, rx4)?;
+        Ok::<(), anyhow::Error>(())
+    });
+    let push6_thread = thread::spawn(move || {
+        push6(config, rx6)?;
+        Ok::<(), anyhow::Error>(())
+    });
+
+    let monitor4_thread = thread::spawn(move || {
+        monitor4(config, tx4)?;
+        Ok::<(), anyhow::Error>(())
+    });
+    let monitor6_thread = thread::spawn(move || {
+        monitor6(config, tx6)?;
+        Ok::<(), anyhow::Error>(())
+    });
+
+    push4_thread.join().unwrap()?;
+    push6_thread.join().unwrap()?;
+
+    monitor4_thread.join().unwrap()?;
+    monitor6_thread.join().unwrap()?;
+
+    Ok(())
+}
+
+fn check_for_addrs4(config: Config, tx: mpsc::Sender<Ipv4Addr>) -> anyhow::Result<Ipv4Addr> {
+    let mut ipv4 = None;
+
+    loop {
+        let new_ipv4 = preferred_ip::get_ipv4_global(config.link4)?;
+
+        if ipv4.is_none() || ipv4.unwrap() != new_ipv4 {
+            tx.send(new_ipv4)?;
+            ipv4 = Some(new_ipv4);
+        }
+
+        thread::sleep(config.interval4);
+    }
+}
+
+fn check_for_addrs6(config: Config, tx: mpsc::Sender<Ipv6Addr>) -> anyhow::Result<Ipv6Addr> {
+    let mut ipv6 = None;
+
+    loop {
+        let new_ipv6 = preferred_ip::get_ipv6_unicast_global(config.link6)?;
+
+        if ipv6.is_none() || ipv6.unwrap() != new_ipv6 {
+            tx.send(new_ipv6)?;
+            ipv6 = Some(new_ipv6);
+        }
+
+        thread::sleep(config.interval6);
+    }
+}
+
+fn monitor4(config: Config, tx: mpsc::Sender<Ipv4Addr>) -> anyhow::Result<()> {
+    loop {
+        match check_for_addrs4(config, tx.clone()) {
+            Ok(_) => println!("check_for_addrs4 exited Ok (this is bad)"),
+            Err(e) => println!("{}", e),
+        }
+
+        thread::sleep(config.interval4);
+    }
+}
+
+fn monitor6(config: Config, tx: mpsc::Sender<Ipv6Addr>) -> anyhow::Result<()> {
+    loop {
+        match check_for_addrs6(config, tx.clone()) {
+            Ok(_) => println!("check_for_addrs6 exited Ok (this is bad)"),
+            Err(e) => println!("{}", e),
+        }
+
+        thread::sleep(config.interval6);
+    }
+}
+
+fn push4(config: Config, rx: mpsc::Receiver<Ipv4Addr>) -> anyhow::Result<()> {
+    let mut last_address = None;
+    loop {
+        let address = rx.recv()?;
+        if last_address.is_none() || address != last_address.unwrap() {
+            let clt = Client::login(Endpoint::Sandbox, config.user, config.pass)?;
+
+            clt.call(RecordUpdate {
+                ids: config.records4.to_vec(),
+                name: None,
+                record_type: Some(RecordType::A),
+                content: Some(address.to_string()),
+                ttl: Some(300),
+                priority: None,
+                url_rdr_type: None,
+                url_rdr_title: None,
+                url_rdr_desc: None,
+                url_rdr_keywords: None,
+                url_rdr_favicon: None,
+                url_append: None,
+                testing_mode: false,
+            })?;
+
+            last_address = Some(address);
+        }
+    }
+}
+
+fn push6(config: Config, rx: mpsc::Receiver<Ipv6Addr>) -> anyhow::Result<()> {
+    let mut last_prefix = None;
+    loop {
+        let prefix = rx.recv()?;
+        if last_prefix.is_none() || prefix != last_prefix.unwrap() {
+            let clt = Client::login(Endpoint::Sandbox, config.user, config.pass)?;
+
+            let mut total_records = Vec::new();
+            for id in config.records6 {
+                let info: RecordInfoResponse = clt
+                    .call(RecordInfoCall {
+                        domain_name: None,
+                        domain_id: None,
+                        record_id: Some(*id),
+                        record_type: Some(RecordType::Aaaa),
+                        name: None,
+                        content: None,
+                        ttl: None,
+                        priority: None,
+                    })?
+                    .try_into()?;
+
+                let mut records = info
+                    .records
+                    .expect("no AAAA records (this should never happen");
+
+                total_records.append(&mut records);
+            }
+
+            for record in total_records {
+                let address = Ipv6Addr::from_str(&record.content)?;
+
+                let b_addr = address.octets().to_vec();
+                let b_net = prefix.octets().to_vec();
+
+                let new_raw = change_prefix(b_addr, b_net, config.prefix_len);
+                let new = Ipv6Addr::from(*array_ref!(new_raw.as_slice(), 0, 16));
+
+                clt.call(RecordUpdate {
+                    ids: vec![record.id],
+                    name: None,
+                    record_type: Some(RecordType::Aaaa),
+                    content: Some(new.to_string()),
+                    ttl: Some(300),
+                    priority: None,
+                    url_rdr_type: None,
+                    url_rdr_title: None,
+                    url_rdr_desc: None,
+                    url_rdr_keywords: None,
+                    url_rdr_favicon: None,
+                    url_append: None,
+                    testing_mode: false,
+                })?;
+            }
+
+            last_prefix = Some(prefix);
+        }
+    }
+}
+
+fn change_prefix(address: Vec<u8>, prefix: Vec<u8>, bits: u32) -> Vec<u8> {
+    address
+        .iter()
+        .zip(prefix.iter())
+        .enumerate()
+        .map(|(i, (a, b))| {
+            if i as u32 >= bits / 8 {
+                let ones = bits % 8;
+                let mask = !(0xff_u8.overflowing_shr(ones).0);
+
+                (a & !mask) | (b & mask)
+            } else {
+                *b
+            }
+        })
+        .collect()
+}