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authorGalen Guyer <galen@galenguyer.com>2022-06-30 00:10:06 -0400
committerGalen Guyer <galen@galenguyer.com>2022-06-30 00:10:06 -0400
commitb44737f714f36bf508d8f7f9fd81d998fcf9cddd (patch)
treeb7185121d5f9e5d7cbc26f038f1a0ccee3da709c
Basic DNS server
-rw-r--r--.gitignore1
-rw-r--r--Cargo.lock777
-rw-r--r--Cargo.toml14
-rw-r--r--src/main.rs97
4 files changed, 889 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
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+ "proc-macro2",
+ "quote",
+ "syn",
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+ "libc",
+ "wasi 0.10.0+wasi-snapshot-preview1",
+ "winapi",
+]
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+ "tinyvec_macros",
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+ "bytes",
+ "libc",
+ "memchr",
+ "mio",
+ "num_cpus",
+ "once_cell",
+ "parking_lot",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "socket2",
+ "tokio-macros",
+ "winapi",
+]
+
+[[package]]
+name = "tokio-macros"
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+[[package]]
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+ "async-trait",
+ "cfg-if",
+ "data-encoding",
+ "enum-as-inner",
+ "futures-channel",
+ "futures-io",
+ "futures-util",
+ "idna",
+ "ipnet",
+ "lazy_static",
+ "log",
+ "rand",
+ "smallvec",
+ "thiserror",
+ "tinyvec",
+ "tokio",
+ "url",
+]
+
+[[package]]
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+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
+[[package]]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
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+dependencies = [
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.36.1"
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+[[package]]
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+[[package]]
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+
+[[package]]
+name = "windows_x86_64_gnu"
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+checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..cb0b25e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "dns-server"
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+fast_log = "1.5.17"
+futures-util = "0.3.21"
+log = "0.4.17"
+tokio = { version = "1.19.2", features = ["full"] }
+trust-dns-proto = "0.21.2"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..8c27974
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,97 @@
+#![deny(unsafe_code)]
+
+use std::net::{Ipv4Addr, SocketAddr};
+
+use futures_util::StreamExt;
+use std::sync::{Arc, Mutex};
+use tokio::net::UdpSocket;
+use trust_dns_proto::op::{Message, MessageType};
+use trust_dns_proto::rr::{DNSClass, RData, Record, RecordType};
+use trust_dns_proto::udp::UdpStream;
+use trust_dns_proto::xfer::SerialMessage;
+use trust_dns_proto::{BufDnsStreamHandle, DnsStreamHandle};
+
+#[tokio::main]
+async fn main() {
+ fast_log::fast_log::init(
+ fast_log::Config::new()
+ .console()
+ .level(log::LevelFilter::Off),
+ )
+ .unwrap();
+
+ let addr = String::from("127.0.0.1:53")
+ .parse::<SocketAddr>()
+ .expect("Unable to parse bind address");
+
+ let socket = UdpSocket::bind(&addr)
+ .await
+ .unwrap_or_else(|_| panic!("Unable to bind to {addr}"));
+ let (mut reciever, sender) =
+ UdpStream::with_bound(socket, "127.0.0.254:9875".parse::<SocketAddr>().unwrap());
+ let sender = Arc::new(Mutex::new(sender));
+
+ loop {
+ let packet = reciever.next().await;
+ let packet = match packet {
+ Some(packet) => packet,
+ _ => continue,
+ };
+
+ match packet {
+ Ok(raw_message) => {
+ let sender = Arc::clone(&sender);
+ tokio::spawn(async move {
+ handle_message(raw_message, sender).await;
+ });
+ }
+ Err(e) => {
+ log::error!("{e}");
+ continue;
+ }
+ }
+ }
+}
+
+async fn handle_message(raw_message: SerialMessage, sender: Arc<Mutex<BufDnsStreamHandle>>) {
+ let src = raw_message.addr();
+ log::debug!("Recieved packet from {src}");
+
+ let mut message = match Message::from_vec(raw_message.bytes()) {
+ Ok(message) => message,
+ Err(e) => {
+ log::error!("{e}");
+ return;
+ }
+ };
+
+ for query in message.clone().queries() {
+ if query.name().to_string() == "example.com." {
+ message.add_answer(
+ Record::new()
+ .set_ttl(60)
+ .set_dns_class(DNSClass::IN)
+ .set_rr_type(RecordType::A)
+ .set_name(query.name().clone())
+ .set_data(Some(RData::A(Ipv4Addr::new(127, 0, 0, 1))))
+ .clone(),
+ );
+ }
+ }
+
+ message.set_message_type(MessageType::Response);
+ message.set_authoritative(true);
+ message.set_recursion_available(false);
+
+ let response = SerialMessage::new(message.to_vec().unwrap(), src);
+ let sender = (*sender).lock().unwrap();
+ let mut sender = sender.with_remote_addr(src);
+ match sender.send(response) {
+ Ok(_) => {
+ log::debug!("{} success", message.id());
+ }
+ Err(e) => {
+ log::error!("{e}");
+ }
+ };
+}