it works

Cargo.lock

@@ -29,6 +29,7 @@ dependencies = [
  "log",
  "serde",
  "serde_yaml_ng",
+ "xdg",
 ]
 
 [[package]]
@@ -413,3 +414,9 @@ dependencies = [
  "js-sys",
  "wasm-bindgen",
 ]
+
+[[package]]
+name = "xdg"
+version = "2.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "213b7324336b53d2414b2db8537e56544d981803139155afa84f76eeebb7a546"

Cargo.toml

@@ -8,6 +8,7 @@ anyhow = "1.0.95"
 femme = "2.2.1"
 serde = { version = "1.0.217", features = ["derive"] }
 serde_yaml_ng = "0.10.0"
+xdg = "2.5.2"
 [dependencies.log]
 version = "0.4.25"
 features = ["kv", "serde"]

src/config.rs

@@ -0,0 +1,24 @@
+use std::{collections::BTreeMap, env, fs::File, net::IpAddr, path::PathBuf, str::FromStr};
+
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+pub struct Config {
+    pub domains: BTreeMap<IpAddr, Vec<String>>,
+}
+
+impl Config {
+    pub fn load() -> anyhow::Result<Self> {
+        let config_loc = env::var("DNS_CHECK_CONFIG")
+            .map_err(anyhow::Error::new)
+            .and_then(|path| PathBuf::from_str(path.as_str()).map_err(anyhow::Error::new))
+            .or_else(|_| -> anyhow::Result<_> {
+                // .or_else::<_, impl FnOnce(_) -> anyhow::Result<_>>(|_| {
+                let cfg_loc = xdg::BaseDirectories::with_prefix("dns-check")?
+                    .place_config_file("config.yml")?;
+                Ok(cfg_loc)
+            })?;
+        let file = File::open(config_loc)?;
+        Ok(serde_yaml_ng::from_reader(file)?)
+    }
+}

src/main.rs

@@ -1,18 +1,23 @@
+mod config;
 pub mod dig_response;
 
-use std::net::IpAddr;
+use std::{net::IpAddr, thread::sleep, time::Duration};
 
+use config::Config;
 use dig_response::DigResponse;
 
 use anyhow::anyhow;
 
 fn main() -> anyhow::Result<()> {
-    run_dns_check("techwork.zone", "67.240.19.249".parse()?)
-    // let txt = File::open("example.txt")?;
-    // let data: DigResponse = serde_yaml_ng::from_reader(txt)?;
-    // println!("{data:?}");
-    // println!("{:?}", data.answers()?);
-    // Ok(())
+    let config = Config::load()?;
+    println!("starting DNS check for {} domains", config.domains.len());
+    for (expected_ip, domains) in config.domains.into_iter() {
+        for domain in &domains {
+            sleep(Duration::from_millis(250));
+            run_dns_check(domain, expected_ip)?;
+        }
+    }
+    Ok(())
 }
 
 fn run_dns_check(domain: impl AsRef<str>, expected_ip: IpAddr) -> anyhow::Result<()> {