From b6db0835fc67f899c4439d3dd4a9e87cabba7458 Mon Sep 17 00:00:00 2001
From: Nixon Enraght-Moony <nixon.emoony@gmail.com>
Date: Tue, 11 Jan 2022 01:18:31 +0000
Subject: [PATCH] DNS client

---
 .gitignore  |   1 +
 Cargo.lock  | 715 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  12 +
 src/main.rs |  48 ++++
 4 files changed, 776 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..172929a
--- /dev/null
+++ b/Cargo.lock
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+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
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+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
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+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
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+ "quote",
+ "wasm-bindgen-macro-support",
+]
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+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
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+[[package]]
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+ "js-sys",
+ "wasm-bindgen",
+]
+
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+ "ring",
+ "untrusted",
+]
+
+[[package]]
+name = "webpki-roots"
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+ "webpki",
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+[[package]]
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+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..77d1578
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "nemicosm"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.52"
+rustls = "0.20.2"
+trust-dns-client = "0.20.3"
+webpki-roots = "0.22.2"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..977957f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,48 @@
+use std::str::FromStr;
+
+use anyhow::{bail, Result};
+use trust_dns_client::client::{Client, SyncClient};
+use trust_dns_client::rr::{DNSClass, Name, RData, RecordType};
+use trust_dns_client::udp::UdpClientConnection;
+
+fn main() -> Result<()> {
+    let (port, host) = resolve_dns("daeken.dev")?;
+
+    dbg!(port);
+    dbg!(host);
+
+    Ok(())
+}
+
+fn resolve_dns(server: &str) -> Result<(u16, String)> {
+    let name = Name::from_str(&format!("_hypercosm._tls.{}", server))?;
+
+    let resp = make_dns_client()?.query(&name, DNSClass::IN, RecordType::SRV)?;
+
+    // TODO: Ensure exactly 1 result: I think.
+    let ans = resp.answers()[0].rdata();
+
+    if let RData::SRV(srv) = ans {
+        // TODO: Handle priority and weight.
+
+        let port = srv.port();
+
+        // TODO: Should this be ascii or utf8
+        let name = srv.target().to_ascii();
+
+        Ok((port, name))
+    } else {
+        bail!("Invalid DNS responce");
+    }
+}
+
+fn make_dns_client() -> Result<impl Client> {
+    // TODO: Make this use TLS
+
+    let addr = "1.1.1.1:53".parse()?;
+    let conn = UdpClientConnection::new(addr)?;
+
+    let client = SyncClient::new(conn);
+
+    Ok(client)
+}