diff options
author | Galen Guyer <galen@galenguyer.com> | 2022-06-30 00:10:06 -0400 |
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committer | Galen Guyer <galen@galenguyer.com> | 2022-06-30 00:10:06 -0400 |
commit | b44737f714f36bf508d8f7f9fd81d998fcf9cddd (patch) | |
tree | b7185121d5f9e5d7cbc26f038f1a0ccee3da709c |
Basic DNS server
-rw-r--r-- | .gitignore | 1 | ||||
-rw-r--r-- | Cargo.lock | 777 | ||||
-rw-r--r-- | Cargo.toml | 14 | ||||
-rw-r--r-- | src/main.rs | 97 |
4 files changed, 889 insertions, 0 deletions
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} +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}"); + } + }; +} |