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+enum Type { + A = 1, +} + +#[repr(u16)] +#[derive(Debug)] +enum Class { + IN = 1, +} + +#[derive(Debug)] +struct Question { + qname: Vec, // TODO: not padded + qtype: Type, // NOTE: should be QTYPE, right now not really needed + qclass: Class, +} + +#[derive(Debug)] +struct Header { + id: u16, + flags: u16, // |QR| Opcode |AA|TC|RD|RA| Z | RCODE | ; 1 | 4 | 1 | 1 | 1 | 1 | 3 | 4 + qdcount: u16, + ancount: u16, + nscount: u16, + arcount: u16, +} + +#[derive(Debug)] +pub struct Message { + header: Option
, + question: Option, + answer: Option, + authority: Option, + additional: Option, +} + +#[derive(Debug)] +struct RR { + name: String, + t: u16, + class: u16, + ttl: u32, + rdlength: u16, + rdata: String, +} + +#[derive(Debug)] +struct Response { + field: Type, +} + +const MAX_DATAGRAM_SIZE: usize = 40_96; + +impl TryFrom for Type { + type Error = (); //TODO: user better error + + fn try_from(value: u16) -> Result { + match value { + x if x == Type::A as u16 => Ok(Type::A), + _ => Err(()), + } + } +} + +impl TryFrom for Class { + type Error = (); //TODO: user better error + + fn try_from(value: u16) -> Result { + match value { + x if x == Class::IN as u16 => Ok(Class::IN), + _ => Err(()), + } + } +} + +// TODO: use Error instead of Option +trait FromBytes { + fn from_bytes(bytes: &[u8]) -> Option + where + Self: Sized; +} + +impl FromBytes for Header { + fn from_bytes(bytes: &[u8]) -> Option { + if bytes.len() != size_of::
() { + return None; // Size of header should match + } + + Some(Header { + id: u16::from_be_bytes(bytes[0..2].try_into().unwrap()), + flags: u16::from_be_bytes(bytes[2..4].try_into().unwrap()), + qdcount: u16::from_be_bytes(bytes[4..6].try_into().unwrap()), + ancount: u16::from_be_bytes(bytes[6..8].try_into().unwrap()), + nscount: u16::from_be_bytes(bytes[8..10].try_into().unwrap()), + arcount: u16::from_be_bytes(bytes[10..12].try_into().unwrap()), + }) + } +} + +//HACK: lots of unsafe unwrap +impl FromBytes for Question { + fn from_bytes(bytes: &[u8]) -> Option { + // 16 for length octet + zero length octet + if bytes.len() < 2 + size_of::() + size_of::() { + None + } else { + let mut qname = vec![]; + let mut i = 0; + + // Parse qname labels + while bytes[i] != 0 && bytes[i] as usize + i < bytes.len() { + qname.push( + String::from_utf8(bytes[i + 1..bytes[i] as usize + 1 + i].to_vec()).unwrap(), + ); + i += bytes[i] as usize + 1; + } + i += 1; + + if bytes.len() - i < size_of::() + size_of::() { + None + } else { + //Try Parse qtype + let qtype = Type::try_from(u16::from_be_bytes(bytes[i..i + 2].try_into().unwrap())) + .unwrap(); + + //Try Parse qclass + let qclass = + Class::try_from(u16::from_be_bytes(bytes[i + 2..i + 4].try_into().unwrap())) + .unwrap(); + + Some(Question { + qname, + qtype, + qclass, + }) + } + } + } +} + +impl FromBytes for Message { + fn from_bytes(bytes: &[u8]) -> Option { + let header = Header::from_bytes(&bytes[0..12]); + let question = Question::from_bytes(&bytes[12..]); + if header.is_some() { + Some(Message { + header, + question, + answer: None, + authority: None, + additional: None, + }) + } else { + None + } + } +} + +async fn create_query(message: Message) { + println!("{:?}", message); +} + +#[tokio::main] +async fn main() -> Result<(), Box> { + let local_addr: SocketAddr = "127.0.0.1:8080".parse()?; + + let socket = UdpSocket::bind(local_addr).await?; + + let mut data = vec![0u8; MAX_DATAGRAM_SIZE]; + loop { + let len = socket.recv(&mut data).await?; + let message = Message::from_bytes(&data[..len]); + if message.is_some() { + tokio::spawn(async move { + create_query(message.unwrap()).await; + }); + } + } +} diff --git a/src/queue.rs b/src/queue.rs new file mode 100644 index 0000000..e69de29 diff --git a/src/resolver.rs b/src/resolver.rs new file mode 100644 index 0000000..e69de29 diff --git a/src/worker.rs b/src/worker.rs new file mode 100644 index 0000000..aa52965 --- /dev/null +++ b/src/worker.rs @@ -0,0 +1,19 @@ +use std::collections::VecDeque; + +use crate::Message; + +struct Worker { + queue: VecDeque +} + +impl Worker { + pub fn new() -> Worker { + Worker { queue: VecDeque::new() } + } + + pub fn append() { + + } +} + +