240 lines
8.3 KiB
Rust
240 lines
8.3 KiB
Rust
use bytes::Bytes;
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use std::any::TypeId;
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use std::collections::HashMap;
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use std::io::Cursor;
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use std::marker::PhantomData;
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use crate::common_types::{Class, Type, types};
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use crate::errors::*;
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use crate::records::structs;
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use crate::ser::{RRData, StaticRRData};
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use crate::ser::text::DnsTextContext;
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// this should be enough for registered names
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const TYPE_NAME_MAX_LEN: usize = 16;
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lazy_static::lazy_static!{
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static ref REGISTRY: Registry = Registry::init();
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}
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fn registry() -> &'static Registry {
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&*REGISTRY
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}
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pub(crate) fn lookup_type_name(name: &str) -> Option<Type> {
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if name.len() >= TYPE_NAME_MAX_LEN { return None; }
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let mut name_buf_storage = [0u8; TYPE_NAME_MAX_LEN];
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let name_buf = &mut name_buf_storage[..name.len()];
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name_buf.copy_from_slice(name.as_bytes());
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name_buf.make_ascii_uppercase();
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let registry = registry();
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let &t = registry.names_to_type.get(name_buf)?;
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Some(t)
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}
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pub fn known_name_to_type(name: &str) -> Option<Type> {
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let registry = registry();
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let t = lookup_type_name(name)?;
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registry.type_parser.get(&t)?;
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Some(t)
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}
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pub fn deserialize_rr_data(ttl: u32, rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Box<dyn RRData>> {
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let registry = registry();
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match registry.type_parser.get(&rr_type) {
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Some(p) => p.deserialize_rr_data(ttl, rr_class, rr_type, data),
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None => Ok(Box::new(super::UnknownRecord::deserialize(rr_type, data)?) as _),
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}
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}
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pub fn parse_rr_data(context: &DnsTextContext, data: &mut &str) -> Result<Box<dyn RRData>> {
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let registry = registry();
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let t = match context.record_type() {
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Some(t) => t,
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None => failure::bail!("require record type to parse record data"),
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};
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match registry.type_parser.get(&t) {
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Some(p) => p.parse_rr_data(context, data),
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None => failure::bail!("unknown type: {}", t),
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}
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}
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pub(crate) fn lookup_type_to_name(rrtype: Type) -> Option<&'static str> {
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let registry = registry();
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registry.type_names.get(&rrtype).map(|s| s as _)
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}
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#[doc(hidden)]
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pub fn check_registration<T: StaticRRData + Sync + 'static>() {
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registry().check_registration::<T>();
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}
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#[derive(Clone, Copy, Debug)]
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struct TagRRDataType<T: RRData>(PhantomData<T>);
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trait RRDataTypeParse: 'static {
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fn type_id(&self) -> TypeId {
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TypeId::of::<Self>()
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}
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fn deserialize_rr_data(&self, ttl: u32, rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Box<dyn RRData>>;
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fn parse_rr_data(&self, context: &DnsTextContext, data: &mut &str) -> Result<Box<dyn RRData>>;
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}
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impl<T: RRData + 'static> RRDataTypeParse for TagRRDataType<T> {
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fn deserialize_rr_data(&self, ttl: u32, rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Box<dyn RRData>> {
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T::deserialize_rr_data(ttl, rr_class, rr_type, data).map(|d| Box::new(d) as _)
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}
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fn parse_rr_data(&self, context: &DnsTextContext, data: &mut &str) -> Result<Box<dyn RRData>> {
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T::dns_parse_rr_data(context, data).map(|d| Box::new(d) as _)
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}
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}
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struct Registry {
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// store (ascii) upper-case names.
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names_to_type: HashMap<Vec<u8>, Type>,
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type_names: HashMap<Type, String>,
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type_parser: HashMap<Type, Box<dyn RRDataTypeParse + Sync>>,
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// make sure registrations are in order
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prev_type: Option<Type>,
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}
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impl Registry {
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fn init() -> Self {
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let mut r = Registry {
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names_to_type: HashMap::new(),
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type_names: HashMap::new(),
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type_parser: HashMap::new(),
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prev_type: None,
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};
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r.register_known::<structs::A>();
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r.register_known::<structs::NS>();
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r.register_known::<structs::MD>();
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r.register_known::<structs::MF>();
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r.register_known::<structs::CNAME>();
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r.register_known::<structs::SOA>();
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r.register_known::<structs::MB>();
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r.register_known::<structs::MG>();
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r.register_known::<structs::MR>();
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r.register_unknown("NULL" , types::NULL);
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r.register_unknown("WKS" , types::WKS);
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r.register_known::<structs::PTR>();
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r.register_known::<structs::HINFO>();
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r.register_known::<structs::MINFO>();
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r.register_known::<structs::MX>();
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r.register_known::<structs::TXT>();
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r.register_known::<structs::RP>();
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r.register_known::<structs::AFSDB>();
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r.register_unknown("X25" , types::X25);
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r.register_unknown("ISDN" , types::ISDN);
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r.register_known::<structs::RT>();
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r.register_unknown("NSAP" , types::NSAP);
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r.register_known::<structs::NSAP_PTR>();
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r.register_known::<structs::SIG>();
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r.register_known::<structs::KEY>();
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r.register_known::<structs::PX>();
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r.register_known::<structs::GPOS>();
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r.register_known::<structs::AAAA>();
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r.register_known::<structs::LOC>();
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r.register_known::<structs::NXT>();
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r.register_unknown("EID" , types::EID);
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r.register_unknown("NIMLOC" , types::NIMLOC);
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r.register_known::<structs::SRV>();
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r.register_unknown("ATMA" , types::ATMA);
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r.register_known::<structs::NAPTR>();
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r.register_known::<structs::KX>();
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r.register_known::<structs::CERT>();
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r.register_known::<structs::A6>();
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r.register_known::<structs::DNAME>();
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r.register_unknown("SINK" , types::SINK);
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r.register_unknown("OPT" , types::OPT);
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r.register_unknown("APL" , types::APL);
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r.register_known::<structs::DS>();
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r.register_known::<structs::SSHFP>();
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r.register_known::<structs::IPSECKEY>();
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r.register_known::<structs::RRSIG>();
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r.register_known::<structs::NSEC>();
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r.register_known::<structs::DNSKEY>();
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r.register_known::<structs::DHCID>();
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r.register_known::<structs::NSEC3>();
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r.register_known::<structs::NSEC3PARAM>();
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r.register_known::<structs::TLSA>();
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r.register_known::<structs::SMIMEA>();
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r.register_unknown("HIP" , types::HIP);
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r.register_known::<structs::NINFO>();
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r.register_known::<structs::RKEY>();
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r.register_unknown("TALINK" , types::TALINK);
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r.register_known::<structs::CDS>();
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r.register_known::<structs::CDNSKEY>();
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r.register_known::<structs::OPENPGPKEY>();
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r.register_unknown("CSYNC" , types::CSYNC);
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r.register_unknown("ZONEMD" , types::ZONEMD);
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r.register_known::<structs::SPF>();
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r.register_unknown("UINFO" , types::UINFO);
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r.register_unknown("UID" , types::UID);
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r.register_unknown("GID" , types::GID);
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r.register_unknown("UNSPEC" , types::UNSPEC);
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r.register_unknown("NID" , types::NID);
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r.register_unknown("L32" , types::L32);
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r.register_unknown("L64" , types::L64);
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r.register_unknown("LP" , types::LP);
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r.register_known::<structs::EUI48>();
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r.register_known::<structs::EUI64>();
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r.register_known::<structs::TKEY>();
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r.register_known::<structs::TSIG>();
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r.register_unknown("IXFR" , types::IXFR);
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r.register_unknown("AXFR" , types::AXFR);
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r.register_unknown("MAILB" , types::MAILB);
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r.register_unknown("MAILA" , types::MAILA);
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r.register_unknown("ANY" , types::ANY);
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r.register_known::<structs::URI>();
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r.register_known::<structs::CAA>();
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r.register_unknown("AVC" , types::AVC);
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r.register_unknown("DOA" , types::DOA);
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r.register_unknown("AMTRELAY" , types::AMTRELAY);
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r.register_unknown("TA" , types::TA);
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r.register_known::<structs::DLV>();
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r.register_known::<structs::ALIAS>();
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// "ALL" could be an alias for the ANY type?
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// assert!(r.names_to_type.insert("ALL".into(), types::ANY).is_none());
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r
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}
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fn register_name(&mut self, name: &str, rrtype: Type) {
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assert!(self.prev_type < Some(rrtype), "registration not in order");
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self.prev_type = Some(rrtype);
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let mut name: String = name.into();
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name.make_ascii_uppercase();
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assert!(!name.starts_with("TYPE"), "must not register generic name: {}", name);
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assert!(name.len() <= TYPE_NAME_MAX_LEN, "name too long: {} - maybe you need to increase TYPE_NAME_MAX_LEN", name);
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assert!(self.names_to_type.insert(name.clone().into_bytes(), rrtype).is_none());
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self.type_names.insert(rrtype, name);
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}
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fn register_unknown(&mut self, name: &'static str, rrtype: Type) {
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self.register_name(name, rrtype);
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}
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fn register_known<T: StaticRRData + Sync + 'static>(&mut self) {
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let rrtype = T::TYPE;
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let name = T::NAME;
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self.register_name(name, rrtype);
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self.type_parser.insert(rrtype, Box::new(TagRRDataType::<T>(PhantomData)));
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}
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fn check_registration<T: StaticRRData + Sync + 'static>(&self) {
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assert_eq!(self.names_to_type.get(T::NAME.as_bytes()), Some(&T::TYPE));
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let p: &dyn RRDataTypeParse = &**self.type_parser.get(&T::TYPE).expect("no parser registered");
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let tid = TypeId::of::<TagRRDataType<T>>();
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assert_eq!(p.type_id(), tid);
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}
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}
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