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Handle parser errors

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This commit is contained in:
Xander Bil 2024-03-25 23:06:04 +01:00
parent 9f8ecac4f0
commit 79b040f5f9
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GPG key ID: EC9706B54A278598
1 changed files with 30 additions and 11 deletions
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41
src/resolver.rs
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@ -5,8 +5,9 @@ use std::sync::Arc;
use tokio::net::UdpSocket; use tokio::net::UdpSocket;
use crate::db::models::{get_from_database, insert_into_database}; use crate::db::models::{get_from_database, insert_into_database};
use crate::errors::ParseError;
use crate::parser::FromBytes; use crate::parser::FromBytes;
use crate::structs::{Class, Message, Type, RCODE, RR, Opcode}; use crate::structs::{Class, Header, Message, Opcode, Type, RCODE};
use crate::utils::vec_equal; use crate::utils::vec_equal;
const MAX_DATAGRAM_SIZE: usize = 4096; const MAX_DATAGRAM_SIZE: usize = 4096;
@ -15,7 +16,6 @@ fn set_response_flags(flags: u16, rcode: RCODE) -> u16 {
(flags | 0b1_0000_1_0_0_0_000_0000 | rcode as u16) & 0b1_1111_1_0_1_0_111_1111 (flags | 0b1_0000_1_0_0_0_000_0000 | rcode as u16) & 0b1_1111_1_0_1_0_111_1111
} }
fn get_opcode(flags: &u16) -> Result<Opcode, String> { fn get_opcode(flags: &u16) -> Result<Opcode, String> {
Opcode::try_from((flags & 0b0111100000000000) >> 11) Opcode::try_from((flags & 0b0111100000000000) >> 11)
} }
@ -55,10 +55,7 @@ async fn handle_update(message: Message) -> Message {
// Check Zone authority // Check Zone authority
let zone = &message.question[0]; let zone = &message.question[0];
let zlen = zone.qname.len(); let zlen = zone.qname.len();
if !(zlen >= 2 if !(zlen >= 2 && zone.qname[zlen - 1] == "gent" && zone.qname[zlen - 2] == "zeus") {
&& zone.qname[zlen - 1] == "gent"
&& zone.qname[zlen - 2] == "zeus")
{
response.header.flags = set_response_flags(response.header.flags, RCODE::NOTAUTH); response.header.flags = set_response_flags(response.header.flags, RCODE::NOTAUTH);
return response; return response;
} }
@ -89,7 +86,6 @@ async fn handle_update(message: Message) -> Message {
response.header.flags = set_response_flags(response.header.flags, RCODE::FORMERR); response.header.flags = set_response_flags(response.header.flags, RCODE::FORMERR);
return response; return response;
} }
} }
for rr in message.authority { for rr in message.authority {
@ -108,6 +104,32 @@ async fn handle_update(message: Message) -> Message {
response response
} }
fn handle_parse_error(bytes: &[u8], err: ParseError) -> Message {
eprintln!("{}", err);
let mut header = Header::from_bytes(bytes, &mut 0).unwrap_or(Header {
id: 0,
flags: 0,
qdcount: 0,
ancount: 0,
nscount: 0,
arcount: 0,
});
header.qdcount = 0;
header.ancount = 0;
header.nscount = 0;
header.arcount = 0;
header.flags = set_response_flags(header.flags, RCODE::FORMERR);
Message {
header,
question: vec![],
answer: vec![],
authority: vec![],
additional: vec![],
}
}
async fn get_response(bytes: &[u8]) -> Message { async fn get_response(bytes: &[u8]) -> Message {
let mut i: usize = 0; let mut i: usize = 0;
match Message::from_bytes(bytes, &mut i) { match Message::from_bytes(bytes, &mut i) {
@ -118,10 +140,7 @@ async fn get_response(bytes: &[u8]) -> Message {
}, },
Err(_) => todo!(), Err(_) => todo!(),
}, },
Err(err) => { Err(err) => handle_parse_error(bytes, err),
println!("{}", err);
unimplemented!() //TODO: implement this
}
} }
} }