From 597d1a0aa28602e31e746408145101363296e731 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <mail@tazj.in>
Date: Tue, 13 Jun 2023 21:05:27 +0300
Subject: feat(tazjin/yddns): hack together a quick dyndns update script

Change-Id: I4114a1b83e5f1edbb04d0ab920f107245ec998bd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8761
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
---
 users/tazjin/yddns/.gitignore  |    1 +
 users/tazjin/yddns/Cargo.lock  | 1474 ++++++++++++++++++++++++++++++++++++++++
 users/tazjin/yddns/Cargo.toml  |   13 +
 users/tazjin/yddns/default.nix |    9 +
 users/tazjin/yddns/src/main.rs |  143 ++++
 5 files changed, 1640 insertions(+)
 create mode 100644 users/tazjin/yddns/.gitignore
 create mode 100644 users/tazjin/yddns/Cargo.lock
 create mode 100644 users/tazjin/yddns/Cargo.toml
 create mode 100644 users/tazjin/yddns/default.nix
 create mode 100644 users/tazjin/yddns/src/main.rs

(limited to 'users/tazjin')

diff --git a/users/tazjin/yddns/.gitignore b/users/tazjin/yddns/.gitignore
new file mode 100644
index 0000000000..2f7896d1d1
--- /dev/null
+++ b/users/tazjin/yddns/.gitignore
@@ -0,0 +1 @@
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diff --git a/users/tazjin/yddns/Cargo.lock b/users/tazjin/yddns/Cargo.lock
new file mode 100644
index 0000000000..1314ca0379
--- /dev/null
+++ b/users/tazjin/yddns/Cargo.lock
@@ -0,0 +1,1474 @@
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4700ffa9a32b893a0c0c20a7d818b256ce2fbc37e354930051c476fc11488dda"
+dependencies = [
+ "prost",
+ "prost-types",
+ "tonic",
+ "tonic-build",
+ "walkdir",
+]
+
+[[package]]
+name = "yddns"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "crimp",
+ "tokio",
+ "tonic",
+ "yandex-cloud",
+]
diff --git a/users/tazjin/yddns/Cargo.toml b/users/tazjin/yddns/Cargo.toml
new file mode 100644
index 0000000000..504871bc48
--- /dev/null
+++ b/users/tazjin/yddns/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "yddns"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.71"
+crimp = "4087.0.0"
+tokio = "1.28.2"
+tonic = "0.9.2"
+yandex-cloud = "2023.5.23"
diff --git a/users/tazjin/yddns/default.nix b/users/tazjin/yddns/default.nix
new file mode 100644
index 0000000000..40b0d1c24e
--- /dev/null
+++ b/users/tazjin/yddns/default.nix
@@ -0,0 +1,9 @@
+{ depot, pkgs, ... }:
+
+depot.third_party.naersk.buildPackage {
+  src = ./.;
+  buildInputs = with pkgs; [
+    pkg-config
+    openssl
+  ];
+}
diff --git a/users/tazjin/yddns/src/main.rs b/users/tazjin/yddns/src/main.rs
new file mode 100644
index 0000000000..5799b59daf
--- /dev/null
+++ b/users/tazjin/yddns/src/main.rs
@@ -0,0 +1,143 @@
+use anyhow::{anyhow, bail, Context, Result};
+use crimp::Request;
+use std::env;
+use std::net::Ipv4Addr;
+use tokio::runtime;
+use tonic::codegen::InterceptedService;
+use tonic::transport::channel::Channel;
+use tonic::transport::Endpoint;
+use yandex_cloud::yandex::cloud::dns::v1 as dns;
+use yandex_cloud::yandex::cloud::dns::v1::dns_zone_service_client::DnsZoneServiceClient;
+use yandex_cloud::{AuthInterceptor, TokenProvider};
+
+type DnsClient<T> = DnsZoneServiceClient<InterceptedService<Channel, AuthInterceptor<T>>>;
+
+/// Fetch the current IP from the given URL. It should be the URL of a
+/// site that responds only with the IP in plain text, and nothing else.
+fn get_current_ip(source: &str) -> Result<Ipv4Addr> {
+    let response = Request::get(source)
+        .send()
+        .context("failed to fetch current IP")?
+        .error_for_status(|resp| anyhow!("error response ({})", resp.status))
+        .context("received error response for IP")?
+        .as_string()?
+        .body;
+
+    Ok(response.trim().parse().with_context(|| {
+        format!(
+            "failed to parse IP address from response body: {}",
+            response
+        )
+    })?)
+}
+
+/// Fetch the current address of the target record.
+async fn fetch_current_record_addr<T: TokenProvider>(
+    client: &mut DnsClient<T>,
+    zone_id: &str,
+    record_name: &str,
+) -> Result<Ipv4Addr> {
+    let req = dns::GetDnsZoneRecordSetRequest {
+        dns_zone_id: zone_id.into(),
+        name: record_name.into(),
+        r#type: "A".into(),
+    };
+
+    let response = client
+        .get_record_set(req)
+        .await
+        .context("failed to fetch current record set")?
+        .into_inner();
+
+    if response.data.len() != 1 {
+        bail!(
+            "expected exactly one record for 'A {}', but found {}",
+            record_name,
+            response.data.len()
+        );
+    }
+
+    Ok(response.data[0]
+        .parse()
+        .context("failed to parse returned record")?)
+}
+
+/// Update the record with the new address, if required.
+async fn update_record<T: TokenProvider>(
+    client: &mut DnsClient<T>,
+    zone_id: &str,
+    record_name: &str,
+    new_address: Ipv4Addr,
+) -> Result<()> {
+    let request = dns::UpsertRecordSetsRequest {
+        dns_zone_id: zone_id.into(),
+        replacements: vec![dns::RecordSet {
+            name: record_name.into(),
+            r#type: "A".into(),
+            ttl: 3600, // 1 hour
+            data: vec![new_address.to_string()],
+        }],
+        ..Default::default()
+    };
+
+    client
+        .upsert_record_sets(request)
+        .await
+        .context("failed to update record")?;
+
+    Ok(())
+}
+
+/// Compare the record with the expected value, and issue an update if
+/// necessary.
+async fn compare_update_record<T: TokenProvider>(
+    client: &mut DnsClient<T>,
+    zone_id: &str,
+    record_name: &str,
+    new_ip: Ipv4Addr,
+) -> Result<()> {
+    let old_ip = fetch_current_record_addr(client, zone_id, record_name).await?;
+
+    if old_ip == new_ip {
+        println!("IP address unchanged ({})", old_ip);
+        return Ok(());
+    }
+
+    println!(
+        "IP address changed: current record points to {}, but address is {}",
+        old_ip, new_ip
+    );
+
+    update_record(client, zone_id, record_name, new_ip).await?;
+    println!("successfully updated '{}' to 'A {}'", record_name, new_ip);
+
+    Ok(())
+}
+
+fn main() -> Result<()> {
+    let token = format!("Bearer {}", env::var("YANDEX_CLOUD_TOKEN")?);
+    let target_zone_id =
+        env::var("TARGET_ZONE").unwrap_or_else(|_| "dnsd0tif5mokfu0mg8i5".to_string());
+    let target_record = env::var("TARGET_RECORD").unwrap_or_else(|_| "khtrsk".to_string());
+
+    let current_ip = get_current_ip("http://ifconfig.me")?;
+    println!("current IP address is '{}'", current_ip);
+
+    let rt = runtime::Builder::new_current_thread()
+        .enable_time()
+        .enable_io()
+        .build()?;
+
+    rt.block_on(async move {
+        let channel = Endpoint::from_static("https://dns.api.cloud.yandex.net")
+            .connect()
+            .await?;
+
+        let mut client =
+            DnsZoneServiceClient::with_interceptor(channel, AuthInterceptor::new(token));
+
+        compare_update_record(&mut client, &target_zone_id, &target_record, current_ip).await
+    })?;
+
+    Ok(())
+}
-- 
cgit 1.4.1