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responses working, qclass and qtype from 1 byte to 2

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This commit is contained in:
Andy Pack 2024-02-07 16:50:05 +00:00
parent fa638a1329
commit 308dc38ae0
Signed by: sarsoo
GPG Key ID: A55BA3536A5E0ED7
9 changed files with 106 additions and 65 deletions
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1
dnstp-client/src/main.rs
View File

@ -72,6 +72,7 @@ fn main() {
qclass: QClass::Internet
}
],
additional_records: vec![],
peer: address
};

14
dnstp/src/message/answer/ip_address.rs → dnstp/src/message/answer/a_rdata.rs
View File

@ -1,12 +1,12 @@
use std::fmt::{Debug, Formatter};
use std::net::{IpAddr, Ipv4Addr};
use std::net::Ipv4Addr;
use crate::message::answer::RData;
pub struct IpRData {
pub struct ARdata {
pub rdata: Ipv4Addr
}
impl Debug for IpRData {
impl Debug for ARdata {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.debug_struct("IP")
.field("data", &self.rdata)
@ -14,16 +14,16 @@ impl Debug for IpRData {
}
}
impl RData for IpRData {
impl RData for ARdata {
fn to_bytes(&self) -> Vec<u8> {
return self.rdata.octets().to_vec();
}
}
impl IpRData {
pub fn from(rdata: Ipv4Addr) -> IpRData
impl ARdata {
pub fn from(rdata: Ipv4Addr) -> ARdata
{
IpRData {
ARdata {
rdata
}
}

20
dnstp/src/message/answer/mod.rs
View File

@ -1,17 +1,16 @@
mod raw_rdata;
pub use raw_rdata::RawRData;
mod ip_address;
pub use ip_address::IpRData;
mod a_rdata;
pub use a_rdata::ARdata;
#[cfg(test)]
mod tests;
use std::fmt::{Debug, Display};
use std::fmt::Debug;
use std::fmt::Display;
use crate::byte::{four_byte_split, two_byte_split};
use crate::message::question::{DNSQuestion, QClass, QType, QuestionParseError};
use crate::string::encode_domain_name;
use crate::message::question::{DNSQuestion, QClass, QType};
pub trait RData: Debug {
fn to_bytes(&self) -> Vec<u8>;
@ -19,7 +18,7 @@ pub trait RData: Debug {
#[derive(Debug)]
pub struct DNSAnswer {
pub name: String,
pub name_offset: u16,
pub answer_type: QType,
pub class: QClass,
pub ttl: u32,
@ -31,7 +30,8 @@ impl DNSAnswer {
pub fn to_bytes(&self) -> Vec<u8>
{
let mut ret = encode_domain_name(&self.name);
let (name_1, name_2) = two_byte_split(self.name_offset | (0b11 << 14));
let mut ret = vec![name_1, name_2];
let type_split = two_byte_split(self.answer_type as u16);
ret.push(type_split.0);
@ -56,10 +56,10 @@ impl DNSAnswer {
return ret
}
pub fn from_query(query: &DNSQuestion, data: Box<dyn RData>, ttl: Option<u32>) -> DNSAnswer
pub fn from_query(query: &DNSQuestion, name_offset: u16, data: Box<dyn RData>, ttl: Option<u32>) -> DNSAnswer
{
DNSAnswer {
name: query.qname.clone(),
name_offset,
answer_type: query.qtype,
class: query.qclass,
ttl: ttl.unwrap_or(0),

5
dnstp/src/message/answer/tests.rs
View File

@ -6,7 +6,8 @@ use super::*;
#[ignore]
fn one_answer_back_and_forth() {
let q = DNSAnswer {
name: "google.com".to_string(),
// name_offset: "google.com".to_string(),
name_offset: 12,
answer_type: QType::A,
class: QClass::Internet,
ttl: 0,
@ -19,7 +20,7 @@ fn one_answer_back_and_forth() {
let (q_read, q_reconstructed) = answers_from_bytes(q_bytes, 0).unwrap();
assert_eq!(q.name, q_reconstructed[0].name);
assert_eq!(q.name_offset, q_reconstructed[0].name_offset);
assert_eq!(q.answer_type, q_reconstructed[0].answer_type);
assert_eq!(q.class, q_reconstructed[0].class);
assert_eq!(q.ttl, q_reconstructed[0].ttl);

88
dnstp/src/message/question/mod.rs
View File

@ -2,8 +2,10 @@
mod tests;
use urlencoding::decode;
use crate::byte::{two_byte_extraction, two_byte_split};
use crate::string::encode_domain_name;
#[repr(u16)]
#[derive(Ord, PartialOrd, Eq, PartialEq, Debug, Copy, Clone)]
pub enum QType {
A = 1,
@ -21,29 +23,30 @@ pub enum QType {
SRV = 33
}
impl TryFrom<u8> for QType {
type Error = u8;
impl TryFrom<u16> for QType {
type Error = u16;
fn try_from(v: u8) -> Result<Self, Self::Error> {
fn try_from(v: u16) -> Result<Self, Self::Error> {
match v {
x if x == QType::A as u8 => Ok(QType::A),
x if x == QType::NS as u8 => Ok(QType::NS),
x if x == QType::CNAME as u8 => Ok(QType::CNAME),
x if x == QType::SOA as u8 => Ok(QType::SOA),
x if x == QType::WKS as u8 => Ok(QType::WKS),
x if x == QType::PTR as u8 => Ok(QType::PTR),
x if x == QType::HINFO as u8 => Ok(QType::HINFO),
x if x == QType::MINFO as u8 => Ok(QType::MINFO),
x if x == QType::MX as u8 => Ok(QType::MX),
x if x == QType::TXT as u8 => Ok(QType::TXT),
x if x == QType::RP as u8 => Ok(QType::RP),
x if x == QType::AAAA as u8 => Ok(QType::AAAA),
x if x == QType::SRV as u8 => Ok(QType::SRV),
x if x == QType::A as u16 => Ok(QType::A),
x if x == QType::NS as u16 => Ok(QType::NS),
x if x == QType::CNAME as u16 => Ok(QType::CNAME),
x if x == QType::SOA as u16 => Ok(QType::SOA),
x if x == QType::WKS as u16 => Ok(QType::WKS),
x if x == QType::PTR as u16 => Ok(QType::PTR),
x if x == QType::HINFO as u16 => Ok(QType::HINFO),
x if x == QType::MINFO as u16 => Ok(QType::MINFO),
x if x == QType::MX as u16 => Ok(QType::MX),
x if x == QType::TXT as u16 => Ok(QType::TXT),
x if x == QType::RP as u16 => Ok(QType::RP),
x if x == QType::AAAA as u16 => Ok(QType::AAAA),
x if x == QType::SRV as u16 => Ok(QType::SRV),
_ => Err(v),
}
}
}
#[repr(u16)]
#[derive(Ord, PartialOrd, Eq, PartialEq, Debug, Copy, Clone)]
pub enum QClass {
Internet = 1,
@ -51,14 +54,14 @@ pub enum QClass {
Hesiod = 4,
}
impl TryFrom<u8> for QClass {
type Error = u8;
impl TryFrom<u16> for QClass {
type Error = u16;
fn try_from(v: u8) -> Result<Self, Self::Error> {
fn try_from(v: u16) -> Result<Self, Self::Error> {
match v {
x if x == QClass::Internet as u8 => Ok(QClass::Internet),
x if x == QClass::Chaos as u8 => Ok(QClass::Chaos),
x if x == QClass::Hesiod as u8 => Ok(QClass::Hesiod),
x if x == QClass::Internet as u16 => Ok(QClass::Internet),
x if x == QClass::Chaos as u16 => Ok(QClass::Chaos),
x if x == QClass::Hesiod as u16 => Ok(QClass::Hesiod),
_ => Err(v),
}
}
@ -85,8 +88,15 @@ impl DNSQuestion {
{
let mut ret = encode_domain_name(&self.qname);
ret.push(self.qtype as u8);
ret.push(self.qclass as u8);
let (qtype_1, qtype_2) = two_byte_split(self.qtype as u16);
ret.push(qtype_1);
ret.push(qtype_2);
let (qclass_1, qclass_2) = two_byte_split(self.qclass as u16);
ret.push(qclass_1);
ret.push(qclass_2);
ret
}
@ -107,8 +117,8 @@ pub fn questions_to_bytes(questions: &Vec<DNSQuestion>) -> Vec<u8>
#[derive(Ord, PartialOrd, Eq, PartialEq, Debug)]
pub enum QuestionParseError {
ShortLength(usize),
QTypeParse(u8),
QClassParse(u8)
QTypeParse(u16),
QClassParse(u16)
}
pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u16) -> Result<(i32, Vec<DNSQuestion>), QuestionParseError>
@ -123,7 +133,8 @@ pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u16) -> Result<(i32
let mut current_length: Option<u8> = None;
let mut remaining_length: u8 = 0;
let mut current_qtype: Option<u8> = None;
let mut current_qtype: (Option<u8>, Option<u8>) = (None, None);
let mut current_qclass: (Option<u8>, Option<u8>) = (None, None);
let mut trailers_reached = false;
let mut byte_counter = 0;
@ -137,7 +148,7 @@ pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u16) -> Result<(i32
current_query.clear();
}
Some(_) => {
if byte == 0 {
if byte == 0 && !trailers_reached {
trailers_reached = true;
continue
}
@ -148,12 +159,19 @@ pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u16) -> Result<(i32
remaining_length = byte;
}
else if trailers_reached { // trailer fields
match current_qtype {
None => {
current_qtype = Some(byte);
match (current_qtype, current_qclass) {
((None, _), (_, _)) => {
current_qtype.0 = Some(byte);
},
((_, None), (_, _)) => {
current_qtype.1 = Some(byte);
},
((_, _), (None, _)) => {
current_qclass.0 = Some(byte);
}
Some(qtype_b) => {
match (qtype_b.try_into(), byte.try_into()) {
((Some(qtype_1), Some(qtype_2)), (Some(qclass_1), None)) => {
match (two_byte_extraction(&[qtype_1, qtype_2], 0).try_into(),
two_byte_extraction(&[qclass_1, byte], 0).try_into()) {
(Ok(qtype), Ok(qclass)) => {
questions.push(DNSQuestion {
qname: decode(String::from_utf8(current_query.clone()).unwrap().as_str()).unwrap().to_string(),
@ -168,7 +186,8 @@ pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u16) -> Result<(i32
current_length = None;
remaining_length = byte;
current_query.clear();
current_qtype = None;
current_qtype = (None, None);
current_qclass = (None, None);
trailers_reached = false;
}
(Err(qtype_e), _) => {
@ -179,6 +198,7 @@ pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u16) -> Result<(i32
}
}
}
_ => {}
}
}
else {

1
dnstp/src/message/request.rs
View File

@ -6,6 +6,7 @@ use crate::message::question::{DNSQuestion, questions_to_bytes};
pub struct DNSRequest {
pub header: DNSHeader,
pub questions: Vec<DNSQuestion>,
pub additional_records: Vec<DNSQuestion>,
pub peer: SocketAddr
}

17
dnstp/src/processor/request.rs
View File

@ -1,9 +1,9 @@
use std::net::{IpAddr, Ipv4Addr};
use std::net::Ipv4Addr;
use std::sync::mpsc;
use std::sync::mpsc::{Receiver, Sender};
use std::thread;
use log::{error, info};
use crate::message::answer::{DNSAnswer, IpRData, RawRData};
use crate::message::answer::{DNSAnswer, ARdata};
use crate::message::header::{Direction, ResponseCode};
use crate::message::question::QuestionParseError;
use crate::message::response::DNSResponse;
@ -43,11 +43,18 @@ impl RequestProcesor {
peer: r.peer
};
// response.answers = r.questions.iter().map(|x| DNSAnswer::from_query(x, Box::from(IpRData::from(Ipv4Addr::from([127, 0, 0, 1]))), None)).collect();
response.answers = r.questions
.iter()
.map(|x|
DNSAnswer::from_query(x,
12,
Box::from(ARdata::from(Ipv4Addr::from([127, 0, 0, 1]))),
None))
.collect();
response.header.direction = Direction::Response;
response.header.response = ResponseCode::NameError;
response.header.answer_record_count = 0;
response.header.response = ResponseCode::NoError;
response.header.answer_record_count = 1;
response.header.authority_record_count = 0;
response.header.additional_record_count = 0;

2
dnstp/src/processor/response.rs
View File

@ -27,8 +27,6 @@ impl ResponseProcesor {
{
info!("processing: {}", str::from_utf8(&(*(*m).buffer)).unwrap());
// (*(*m).buffer).reverse();
// match sending_channel.send(m) {
// Ok(_) => {}
// Err(_) => {}

15
dnstp/src/request_parser.rs
View File

@ -90,15 +90,28 @@ pub fn parse_request(msg: NetworkMessage) -> Result<DNSRequest, RequestParseErro
Ok(header) => {
let mut trimmed = msg.buffer.to_vec();
trimmed.drain(0 .. 12);
let buffer_size = trimmed.len();
match questions_from_bytes(trimmed, header.question_count)
{
Ok((bytes_read, questions)) => {
if buffer_size > bytes_read as usize {
Ok(DNSRequest {
header,
questions,
peer: msg.peer
peer: msg.peer,
additional_records: vec![]
})
}
else {
Ok(DNSRequest {
header,
questions,
peer: msg.peer,
additional_records: vec![]
})
}
}
Err(e) => Err(QuesionsParse(e))
}
},