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+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
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+dependencies = [
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+]
diff --git a/Cargo.toml b/Cargo.toml
index dca5ac2..e57a4c0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,3 +2,14 @@
 name = "acmed-hook-rfc2136"
 version = "0.1.0"
 edition = "2021"
+
+[dependencies]
+anyhow = "1.0.71"
+base64 = "0.21.0"
+clap = { version = "4.2.7", features = ["derive"] }
+serde = { version = "1.0.163", features = ["derive"] }
+serde_with = { version = "3.0.0", features = ["base64"] }
+time = "0.3.21"
+toml = "0.7.3"
+trust-dns-client = { version = "0.22.0", features = ["dnssec", "dnssec-openssl"] }
+trust-dns-proto = { version = "0.22.0", features = ["dnssec-openssl"] }
diff --git a/config.toml.sample b/config.toml.sample
new file mode 100644
index 0000000..945c9cf
--- /dev/null
+++ b/config.toml.sample
@@ -0,0 +1,7 @@
+resolver = "1.1.1.1:53"
+
+[zones."acme.example.org"]
+primary_ns = "1.2.3.4:53"
+tsig_name = "my-tsig-name"
+tsig_key = "" #base64 encoded key, standard alphabet, padded
+tsig_algorithm = "hmac-sha256"
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..d343da3
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,44 @@
+use serde::{Deserialize, Deserializer};
+use serde_with::{serde_as, MapPreventDuplicates, DisplayFromStr, base64::Base64};
+use anyhow::{Context, Result};
+use std::collections::HashMap;
+use std::str::FromStr;
+use trust_dns_client::rr::Name;
+use trust_dns_client::rr::rdata::tsig::{TsigAlgorithm};
+
+#[serde_as]
+#[derive(Deserialize)]
+pub(crate) struct Config {
+    pub(crate) resolver: std::net::SocketAddr,
+    #[serde_as(as = "MapPreventDuplicates<DisplayFromStr, _>")]
+    pub(crate) zones: HashMap<Name, ZoneConfig>,
+}
+
+#[serde_as]
+#[derive(Deserialize)]
+pub(crate) struct ZoneConfig {
+    pub(crate) primary_ns: std::net::SocketAddr,
+    #[serde_as(as = "DisplayFromStr")]
+    pub(crate) tsig_name: Name,
+    #[serde_as(as = "Base64")]
+    pub(crate) tsig_key: Vec<u8>,
+    #[serde(deserialize_with = "deserialize_tsig_algorithm")]
+    pub(crate) tsig_algorithm: TsigAlgorithm,
+}
+
+pub(crate) fn read_config(path: &std::path::Path) -> Result<Config> {
+    // TODO: error message on config not found
+    let config_file_content = std::fs::read_to_string(path).context("Couldn't read config file")?;
+    toml::from_str(&config_file_content).context("Couldn't parse config file")
+}
+
+fn deserialize_tsig_algorithm<'de, D>(
+    deserializer: D
+) -> Result<TsigAlgorithm, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s = String::deserialize(deserializer)?;
+    let name = Name::from_str(&s).map_err(serde::de::Error::custom)?;
+    Ok(TsigAlgorithm::from_name(name))
+}
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..8eca046 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,61 @@
-fn main() {
-    println!("Hello, world!");
+use anyhow::{Context};
+use clap::Parser;
+use std::str::FromStr;
+use time::Duration;
+use trust_dns_client::client::{Client, SyncClient};
+use trust_dns_client::udp::UdpClientConnection;
+use trust_dns_client::op::DnsResponse;
+use trust_dns_client::rr::dnssec::tsig::{TSigner};
+use trust_dns_client::rr::rdata::{TXT};
+use trust_dns_client::rr::{Name, RData, Record, RecordType};
+use crate::config::{read_config};
+
+mod config;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    #[arg(long)]
+    config: std::path::PathBuf,
+    #[arg(long)]
+    identifier: String,
+    #[arg(long)]
+    proof: String,
+}
+
+fn main() -> anyhow::Result<()> {
+    let cli = Cli::parse();
+    let config = read_config(&cli.config)?;
+    let mut record = find_record(&cli.identifier)?;
+    let origin = record.name().clone(); // TODO: find out zone via SOA
+
+    let zone_config = &config.zones.get(record.name()).unwrap(); // TODO: Handle None
+    let tsigner = TSigner::new(zone_config.tsig_key.clone(),
+                               zone_config.tsig_algorithm.clone(),
+                               zone_config.tsig_name.clone(), 300).unwrap();
+
+    let conn = UdpClientConnection::new(zone_config.primary_ns).unwrap();
+    let client = SyncClient::with_tsigner(conn, tsigner);
+
+    record.set_data(Some(RData::TXT(TXT::new(Vec::from([cli.proof])))));
+    let result = client.create(record, origin).context("Couldn't set record")?;
+
+    Ok(())
+}
+
+fn find_record(identifier: &String) -> anyhow::Result<Record> {
+    let name = Name::from_str(&("_acme-challenge.".to_owned() + identifier)).context("Invalid input for identifier")?;
+
+    // TODO: traverse CNAMEs, find last CNAME
+    // let address = "1.1.1.1:53".parse().unwrap();
+    // let conn = UdpClientConnection::new(address).unwrap();
+    // let client = SyncClient::new(conn);
+    // let response: DnsResponse = client.query(&name, DNSClass::IN, RecordType::TXT).unwrap();
+    // let answers: &[Record] = response.answers();
+    // println!("answer: {:?}", answers);
+
+    return Ok(Record::with(name,
+                           RecordType::TXT,
+                           Duration::minutes(1).whole_seconds() as u32));
+
 }