parsing questions back and forth
This commit is contained in:
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985adbae68
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GPG Key ID:
A55BA3536A5E0ED7
68
Cargo.lock
generated
68
Cargo.lock
generated
@ -130,16 +130,7 @@ name = "dnstplib"
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version = "0.1.0"
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dependencies = [
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"log",
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"url",
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]
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[[package]]
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name = "form_urlencoded"
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version = "1.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
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dependencies = [
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"percent-encoding",
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"urlencoding",
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]
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[[package]]
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@ -148,16 +139,6 @@ version = "0.4.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
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[[package]]
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name = "idna"
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version = "0.5.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "634d9b1461af396cad843f47fdba5597a4f9e6ddd4bfb6ff5d85028c25cb12f6"
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dependencies = [
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"unicode-bidi",
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"unicode-normalization",
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]
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[[package]]
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name = "itoa"
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version = "1.0.10"
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@ -185,12 +166,6 @@ dependencies = [
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"libc",
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]
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[[package]]
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name = "percent-encoding"
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version = "2.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
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[[package]]
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name = "powerfmt"
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version = "0.2.0"
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@ -303,27 +278,6 @@ dependencies = [
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"time-core",
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]
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[[package]]
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name = "tinyvec"
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version = "1.6.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
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dependencies = [
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"tinyvec_macros",
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]
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[[package]]
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name = "tinyvec_macros"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
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[[package]]
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name = "unicode-bidi"
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version = "0.3.15"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "08f95100a766bf4f8f28f90d77e0a5461bbdb219042e7679bebe79004fed8d75"
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[[package]]
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name = "unicode-ident"
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version = "1.0.12"
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@ -331,24 +285,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
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[[package]]
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name = "unicode-normalization"
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version = "0.1.22"
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name = "urlencoding"
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version = "2.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
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dependencies = [
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"tinyvec",
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]
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[[package]]
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name = "url"
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version = "2.5.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "31e6302e3bb753d46e83516cae55ae196fc0c309407cf11ab35cc51a4c2a4633"
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dependencies = [
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"form_urlencoded",
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"idna",
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"percent-encoding",
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]
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checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
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[[package]]
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name = "utf8parse"
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@ -7,4 +7,4 @@ edition = "2021"
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[dependencies]
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log = "0.4.20"
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url = "2.5.0"
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urlencoding = "2.1.3"
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@ -1,4 +1,5 @@
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use url::form_urlencoded;
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use std::ops::Sub;
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use urlencoding::{encode, decode};
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#[derive(Ord, PartialOrd, Eq, PartialEq, Debug, Copy, Clone)]
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enum QType {
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@ -17,6 +18,29 @@ enum QType {
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SRV = 33
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}
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impl TryFrom<u8> for QType {
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type Error = ();
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fn try_from(v: u8) -> Result<Self, Self::Error> {
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match v {
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x if x == QType::A as u8 => Ok(QType::A),
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x if x == QType::NS as u8 => Ok(QType::NS),
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x if x == QType::CNAME as u8 => Ok(QType::CNAME),
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x if x == QType::SOA as u8 => Ok(QType::SOA),
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x if x == QType::WKS as u8 => Ok(QType::WKS),
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x if x == QType::PTR as u8 => Ok(QType::PTR),
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x if x == QType::HINFO as u8 => Ok(QType::HINFO),
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x if x == QType::MINFO as u8 => Ok(QType::MINFO),
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x if x == QType::MX as u8 => Ok(QType::MX),
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x if x == QType::TXT as u8 => Ok(QType::TXT),
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x if x == QType::RP as u8 => Ok(QType::RP),
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x if x == QType::AAAA as u8 => Ok(QType::AAAA),
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x if x == QType::SRV as u8 => Ok(QType::SRV),
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_ => Err(()),
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}
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}
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}
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#[derive(Ord, PartialOrd, Eq, PartialEq, Debug, Copy, Clone)]
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enum QClass {
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Internet = 1,
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@ -24,6 +48,20 @@ enum QClass {
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Hesiod = 4,
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}
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impl TryFrom<u8> for QClass {
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type Error = ();
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fn try_from(v: u8) -> Result<Self, Self::Error> {
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match v {
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x if x == QClass::Internet as u8 => Ok(QClass::Internet),
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x if x == QClass::Chaos as u8 => Ok(QClass::Chaos),
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x if x == QClass::Hesiod as u8 => Ok(QClass::Hesiod),
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_ => Err(()),
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}
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}
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}
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#[derive(Ord, PartialOrd, Eq, PartialEq, Debug)]
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struct DNSQuestion {
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qname: String,
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qtype: QType,
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@ -42,16 +80,15 @@ impl DNSQuestion {
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pub fn to_bytes(&self) -> Vec<u8>
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{
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let mut ret: Vec<u8> = vec!();
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let mut ret: Vec<u8> = Vec::with_capacity(self.qname.len() + 2 + 3);
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for part in self.qname.split(".")
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{
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let encoded_string: String = form_urlencoded::byte_serialize(part.as_bytes()).collect();
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let encoded_string = encode(part);
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let count = encoded_string.len();
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ret.push(count as u8);
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ret.reserve(count);
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for x in encoded_string.into_bytes() {
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for x in encoded_string.bytes() {
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ret.push(x);
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};
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}
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@ -63,4 +100,200 @@ impl DNSQuestion {
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ret
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}
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}
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pub fn questions_from_bytes(bytes: Vec<u8>, total_questions: u8) -> Result<Vec<DNSQuestion>, ()>
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{
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if (bytes.len() < 4)
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{
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return Err(());
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}
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let mut questions: Vec<DNSQuestion> = Vec::with_capacity(total_questions as usize);
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let mut current_query: Option<Vec<u8>> = None;
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let mut current_length: Option<u8> = None;
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let mut remaining_length: Box<u8> = Box::from(0);
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let mut current_qtype: Option<u8> = None;
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let mut current_qclass: Option<u8> = None;
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let mut trailers_reached = false;
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for byte in bytes {
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match current_length {
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None => { // next question, init lengths
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current_length = Some(byte);
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remaining_length = Box::from(byte);
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current_query = Some(Vec::with_capacity(10));
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}
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Some(_) => {
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if byte == 0 {
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trailers_reached = true;
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continue
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}
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if *remaining_length == 0 && !trailers_reached {
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current_query.as_mut().unwrap().push('.' as u8);
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current_length = Some(byte);
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remaining_length = Box::from(byte);
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}
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else if trailers_reached { // trailer fields
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match current_qtype {
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None => {
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current_qtype = Some(byte);
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}
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Some(qtype_b) => {
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match current_qclass {
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None => {
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current_qclass = Some(byte);
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}
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Some(qclass_b) => {
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match (qtype_b.try_into(), qclass_b.try_into()) {
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(Ok(qtype), Ok(qclass)) => {
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questions.push(DNSQuestion {
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qname: String::from_utf8(current_query.unwrap()).unwrap(),
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qtype,
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qclass
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});
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current_length = Some(byte);
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remaining_length = Box::from(byte);
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current_query = Some(Vec::with_capacity(10));
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current_qtype = None;
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current_qclass = None;
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trailers_reached = false;
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}
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_ => {
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return Err(());
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}
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}
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}
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}
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}
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}
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}
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else
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{
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current_query.as_mut().unwrap().push(byte);
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*remaining_length = remaining_length.sub(1);
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}
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}
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}
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}
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match (current_qtype, current_qclass) {
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(Some(qtype), Some(qclass)) => {
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match (qtype.try_into(), qclass.try_into()) {
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(Ok(qtype), Ok(qclass)) => {
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questions.push(DNSQuestion {
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qname: String::from_utf8(current_query.unwrap()).unwrap(),
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qtype,
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qclass
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});
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}
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_ => {
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return Err(());
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}
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}
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}
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_ => {
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return Err(());
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}
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}
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Ok(questions)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn one_question_back_and_forth() {
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let q = DNSQuestion {
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qname: "google.com".to_string(),
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qclass: QClass::Internet,
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qtype: QType::A
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};
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let q_bytes = q.to_bytes();
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let q_reconstructed = questions_from_bytes(q_bytes, 1).unwrap();
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assert_eq!(q.qname, q_reconstructed[0].qname);
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assert_eq!(q.qclass, q_reconstructed[0].qclass);
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assert_eq!(q.qtype, q_reconstructed[0].qtype);
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}
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#[test]
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fn two_questions_back_and_forth() {
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let q = DNSQuestion {
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qname: "google.com".to_string(),
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qclass: QClass::Internet,
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qtype: QType::A
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};
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let q2 = DNSQuestion {
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qname: "duck.com".to_string(),
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qclass: QClass::Internet,
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qtype: QType::AAAA
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};
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let mut q_bytes = q.to_bytes();
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let mut q2_bytes = q2.to_bytes();
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q_bytes.append(&mut q2_bytes);
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let q_reconstructed = questions_from_bytes(q_bytes, 2).unwrap();
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assert_eq!(q.qname, q_reconstructed[0].qname);
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assert_eq!(q.qclass, q_reconstructed[0].qclass);
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assert_eq!(q.qtype, q_reconstructed[0].qtype);
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assert_eq!(q2.qname, q_reconstructed[1].qname);
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assert_eq!(q2.qclass, q_reconstructed[1].qclass);
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assert_eq!(q2.qtype, q_reconstructed[1].qtype);
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}
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#[test]
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fn three_questions_back_and_forth() {
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let q = DNSQuestion {
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qname: "google.com".to_string(),
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qclass: QClass::Internet,
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qtype: QType::A
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};
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let q2 = DNSQuestion {
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qname: "duck.com".to_string(),
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qclass: QClass::Internet,
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qtype: QType::AAAA
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};
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let q3 = DNSQuestion {
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qname: "facebook.com".to_string(),
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qclass: QClass::Hesiod,
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qtype: QType::CNAME
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};
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let mut q_bytes = q.to_bytes();
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let mut q2_bytes = q2.to_bytes();
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let mut q3_bytes = q3.to_bytes();
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q_bytes.append(&mut q2_bytes);
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q_bytes.append(&mut q3_bytes);
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let q_reconstructed = questions_from_bytes(q_bytes, 2).unwrap();
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assert_eq!(q.qname, q_reconstructed[0].qname);
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assert_eq!(q.qclass, q_reconstructed[0].qclass);
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assert_eq!(q.qtype, q_reconstructed[0].qtype);
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assert_eq!(q2.qname, q_reconstructed[1].qname);
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assert_eq!(q2.qclass, q_reconstructed[1].qclass);
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assert_eq!(q2.qtype, q_reconstructed[1].qtype);
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assert_eq!(q3.qname, q_reconstructed[2].qname);
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assert_eq!(q3.qclass, q_reconstructed[2].qclass);
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assert_eq!(q3.qtype, q_reconstructed[2].qtype);
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}
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}
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