start implementing resolver

This commit is contained in:
Stefan Bühler 2018-03-07 09:27:19 +01:00
parent 5519e7faa8
commit 023e693831
9 changed files with 482 additions and 50 deletions

246
Cargo.lock generated
View File

@ -1,43 +1,46 @@
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"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"

View File

@ -6,4 +6,8 @@ authors = ["Stefan Bühler <stbuehler@web.de>"]
[dependencies]
dnsbox-base = { path = "lib/dnsbox-base" }
futures = "0.1.18"
tokio-core = "0.1.12"
tokio-io = "0.1.5"
[workspace]

6
data/Makefile Normal file
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@ -0,0 +1,6 @@
all: root-hint.txt
.PHONY: all
root-hint.txt:
dig +nocomment +noquestion +nocmd +nostat NS . @a.root-servers.net. | column -t | sort > root-hint.txt
.PHONY: root-hint.txt

39
data/root-hint.txt Normal file
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@ -0,0 +1,39 @@
. 518400 IN NS a.root-servers.net.
. 518400 IN NS b.root-servers.net.
. 518400 IN NS c.root-servers.net.
. 518400 IN NS d.root-servers.net.
. 518400 IN NS e.root-servers.net.
. 518400 IN NS f.root-servers.net.
. 518400 IN NS g.root-servers.net.
. 518400 IN NS h.root-servers.net.
. 518400 IN NS i.root-servers.net.
. 518400 IN NS j.root-servers.net.
. 518400 IN NS k.root-servers.net.
. 518400 IN NS l.root-servers.net.
. 518400 IN NS m.root-servers.net.
a.root-servers.net. 518400 IN A 198.41.0.4
a.root-servers.net. 518400 IN AAAA 2001:503:ba3e::2:30
b.root-servers.net. 518400 IN A 199.9.14.201
b.root-servers.net. 518400 IN AAAA 2001:500:200::b
c.root-servers.net. 518400 IN A 192.33.4.12
c.root-servers.net. 518400 IN AAAA 2001:500:2::c
d.root-servers.net. 518400 IN A 199.7.91.13
d.root-servers.net. 518400 IN AAAA 2001:500:2d::d
e.root-servers.net. 518400 IN A 192.203.230.10
e.root-servers.net. 518400 IN AAAA 2001:500:a8::e
f.root-servers.net. 518400 IN A 192.5.5.241
f.root-servers.net. 518400 IN AAAA 2001:500:2f::f
g.root-servers.net. 518400 IN A 192.112.36.4
g.root-servers.net. 518400 IN AAAA 2001:500:12::d0d
h.root-servers.net. 518400 IN A 198.97.190.53
h.root-servers.net. 518400 IN AAAA 2001:500:1::53
i.root-servers.net. 518400 IN A 192.36.148.17
i.root-servers.net. 518400 IN AAAA 2001:7fe::53
j.root-servers.net. 518400 IN A 192.58.128.30
j.root-servers.net. 518400 IN AAAA 2001:503:c27::2:30
k.root-servers.net. 518400 IN A 193.0.14.129
k.root-servers.net. 518400 IN AAAA 2001:7fd::1
l.root-servers.net. 518400 IN A 199.7.83.42
l.root-servers.net. 518400 IN AAAA 2001:500:9f::42
m.root-servers.net. 518400 IN A 202.12.27.33
m.root-servers.net. 518400 IN AAAA 2001:dc3::35

View File

@ -9,7 +9,7 @@ bytes = "0.4"
dnsbox-derive = { path = "../dnsbox-derive" }
failure = "0.1.1"
lazy_static = "1.0.0"
log = "0.3"
log = "0.4"
smallvec = "0.4.4"
data-encoding = "2.1.0"

179
src/bin/resolver/cache/mod.rs vendored Normal file
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@ -0,0 +1,179 @@
use dnsbox_base::common_types::{Type, DnsName};
use dnsbox_base::failure::Error;
use dnsbox_base::packet::Resource;
use dnsbox_base::ser::RRData;
use futures::{Future, Poll, Async};
use futures::unsync::oneshot;
use std::cell::RefCell;
use std::collections::HashMap;
use std::mem::replace;
use std::net::{Ipv4Addr, Ipv6Addr};
use std::rc::Rc;
use std::time::Duration;
mod root_hints;
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub enum Source {
Hint,
Glue,
Authority,
}
#[derive(Clone, Debug)]
pub struct Entry {
rrset: Vec<Box<RRData>>,
source: Source,
ttl: u32,
}
impl Entry {
pub fn new(rrset: Vec<Box<RRData>>, source: Source) -> Self {
unimplemented!()
}
/// whether TTL not reached yet. might also check DNSSEC stamps
pub fn alive(&self) -> bool {
true
}
pub fn needs_refresh(&self) -> bool {
// TTL > 60 and only 25% ttl left before getting invalid
false
}
}
enum InnerEntry {
Missing,
Hit(Rc<Entry>),
Refreshing(Rc<Entry>),
Pending(Vec<oneshot::Sender<Rc<Entry>>>),
}
impl InnerEntry {
fn restart(&mut self) -> (bool, CacheResult) {
// start new lookup
let (tx, rx) = oneshot::channel();
replace(self, InnerEntry::Pending(vec![tx]));
(true, CacheResult(InnerResult::Waiting(rx)))
}
fn get(&mut self) -> (bool, CacheResult) {
match replace(self, InnerEntry::Missing) {
InnerEntry::Missing => self.restart(),
InnerEntry::Hit(e) => {
if !e.alive() {
self.restart();
}
let res = CacheResult(InnerResult::Ready(e.clone()));
let start_lookup = if e.needs_refresh() {
replace(self, InnerEntry::Refreshing(e));
true
} else {
replace(self, InnerEntry::Hit(e));
false
};
(start_lookup, res)
},
InnerEntry::Refreshing(e) => {
if !e.alive() {
// new request already pending; but need new wait queue
(false, self.restart().1)
} else {
let res = CacheResult(InnerResult::Ready(e.clone()));
replace(self, InnerEntry::Refreshing(e));
(false, res)
}
}
InnerEntry::Pending(mut queue) => {
let (tx, rx) = oneshot::channel();
queue.push(tx);
replace(self, InnerEntry::Pending(queue));
(false, CacheResult(InnerResult::Waiting(rx)))
}
}
}
}
type NameEntry = HashMap<Type, InnerEntry>;
pub type LookupFunction = Box<FnMut(DnsName) -> Box<Future<Item = Entry, Error = Error>>>;
pub struct Cache {
names: Rc<RefCell<HashMap<String, NameEntry>>>,
timeout: Duration,
lookup: RefCell<LookupFunction>,
}
impl Cache {
pub fn new(timeout: Duration, lookup: LookupFunction) -> Self {
Cache {
names: Rc::new(RefCell::new(HashMap::new())),
timeout: timeout,
lookup: RefCell::new(lookup),
}
}
fn start_lookup(&self, name: DnsName, rrtype: Type) {
unimplemented!()
}
pub fn lookup(&self, name: DnsName, rrtype: Type) -> CacheResult {
let mut name_str = format!("{}", name);
name_str.make_ascii_lowercase();
let (start_lookup, res) = {
let mut names = self.names.borrow_mut();
let types = names.entry(name_str).or_insert_with(|| HashMap::new());
let entry = types.entry(rrtype).or_insert(InnerEntry::Missing);
entry.get()
};
if start_lookup {
self.start_lookup(name, rrtype);
}
res
}
/// Insert hints
///
/// # Panics
///
/// Panics when the `rrset` entries don't match `rrtype`.
pub fn insert_hint(&self, name: DnsName, rrtype: Type, rrset: Vec<Box<RRData>>) {
for e in &rrset {
assert_eq!(rrtype, e.rr_type());
}
}
}
pub struct CacheResult(InnerResult);
enum InnerResult {
Ready(Rc<Entry>),
Waiting(oneshot::Receiver<Rc<Entry>>),
Finished,
}
impl Future for CacheResult {
type Item = Rc<Entry>;
type Error = Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
match replace(&mut self.0, InnerResult::Finished) {
InnerResult::Ready(res) => Ok(Async::Ready(res)),
InnerResult::Waiting(mut rc) => {
match rc.poll()? {
Async::Ready(res) => Ok(Async::Ready(res)),
Async::NotReady => {
// keep waiting
replace(&mut self.0, InnerResult::Waiting(rc));
Ok(Async::NotReady)
}
}
},
InnerResult::Finished => Ok(Async::NotReady),
}
}
}

40
src/bin/resolver/cache/root_hints.rs vendored Normal file
View File

@ -0,0 +1,40 @@
use dnsbox_base::common_types::{types, classes};
use dnsbox_base::common_types::{DnsName, DnsCompressedName};
use dnsbox_base::packet::Resource;
use dnsbox_base::records::{NS, A, AAAA};
use dnsbox_base::ser::RRData;
use std::net::{Ipv4Addr, Ipv6Addr};
static DATA: [(&str, &str, &str); 13] = [
("a.root-servers.net.", "198.41.0.4", "2001:503:ba3e::2:30"),
("b.root-servers.net.", "199.9.14.201", "2001:500:200::b"),
("c.root-servers.net.", "192.33.4.12", "2001:500:2::c"),
("d.root-servers.net.", "199.7.91.13", "2001:500:2d::d"),
("e.root-servers.net.", "192.203.230.10", "2001:500:a8::e"),
("f.root-servers.net.", "192.5.5.241", "2001:500:2f::f"),
("g.root-servers.net.", "192.112.36.4", "2001:500:12::d0d"),
("h.root-servers.net.", "198.97.190.53", "2001:500:1::53"),
("i.root-servers.net.", "192.36.148.17", "2001:7fe::53"),
("j.root-servers.net.", "192.58.128.30", "2001:503:c27::2:30"),
("k.root-servers.net.", "193.0.14.129", "2001:7fd::1"),
("l.root-servers.net.", "199.7.83.42", "2001:500:9f::42"),
("m.root-servers.net.", "202.12.27.33", "2001:dc3::35"),
];
pub fn load_hints(cache: &super::Cache) {
let mut root_ns_set: Vec<Box<RRData>> = Vec::new();
for &(name, ipv4, ipv6) in &DATA {
let name = name.parse::<DnsName>().expect("invalid root hint name");
let ipv4 = ipv4.parse::<Ipv4Addr>().expect("invalid root hint ipv4 addr");
let ipv6 = ipv6.parse::<Ipv6Addr>().expect("invalid root hint ipv6 addr");
root_ns_set.push(Box::new(NS {
nsdname: DnsCompressedName(name.clone()),
}));
cache.insert_hint(name.clone(), types::A, vec![Box::new(A { addr: ipv4 })]);
cache.insert_hint(name.clone(), types::AAAA, vec![Box::new(AAAA { addr: ipv6 })]);
}
cache.insert_hint(DnsName::new_root(), types::NS, root_ns_set);
unimplemented!()
}

11
src/bin/resolver/main.rs Normal file
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@ -0,0 +1,11 @@
extern crate dnsbox_base;
extern crate futures;
extern crate tokio_core;
extern crate tokio_io;
pub mod cache;
fn main() {
println!("Test");
}

View File

@ -1,5 +0,0 @@
extern crate dnsbox_base;
fn main() {
println!("Test");
}