netstack: Remove dnsd
It isn't used anywhere. Relibc has it's own dns resolver.
This commit is contained in:
bjorn3
@@ -1,97 +0,0 @@
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#[macro_use]
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extern crate log;
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use anyhow::{Context, Result};
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use event::EventQueue;
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use ioslice::IoSlice;
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use libredox::Fd;
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use redox_netstack::logger;
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use redox_scheme::Socket;
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use scheme::Dnsd;
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use std::fs::File;
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use std::os::unix::io::{FromRawFd, RawFd};
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use std::process;
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mod scheme;
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fn run(daemon: redox_daemon::Daemon) -> Result<()> {
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use libredox::flag::*;
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let dns_socket = Socket::nonblock("dns").context("failed to open :dns")?;
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let time_path = format!("/scheme/time/{}", CLOCK_MONOTONIC);
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let time_fd = Fd::open(&time_path, O_RDWR, 0).context("failed to open time")?;
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let nameserver_fd = Fd::open(
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"/scheme/netcfg/resolv/nameserver",
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O_RDWR | O_CREAT | O_NONBLOCK,
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0,
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)
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.context("failed to open nameserver")?;
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let event_queue = EventQueue::<EventSource>::new().context("failed to create event queue")?;
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event_queue
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.subscribe(
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dns_socket.inner().raw(),
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EventSource::DnsScheme,
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event::EventFlags::READ,
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)
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.context("failed to listen to time events")?;
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event_queue
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.subscribe(
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nameserver_fd.raw(),
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EventSource::NameserverScheme,
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event::EventFlags::READ,
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)
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.context("failed to listen to nameserver socket events")?;
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event_queue
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.subscribe(time_fd.raw(), EventSource::Timer, event::EventFlags::READ)
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.context("failed to listen to timer events")?;
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let time_file = unsafe { File::from_raw_fd(time_fd.into_raw() as RawFd) };
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let mut dnsd = Dnsd::new(dns_socket, time_file, &event_queue);
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let new_ns =
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libredox::call::mkns(&[IoSlice::new(b"dns")]).expect("dnsd: failed to create namespace");
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libredox::call::setrens(new_ns, new_ns).expect("dnsd: failed to enter namespace");
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daemon.ready().expect("dnsd: failed to notify parent");
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for event_res in event_queue.iter() {
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let event = event_res.context("failed to read from event queue")?;
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match event.user_data {
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EventSource::DnsScheme => {
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if !dnsd.on_dns_file_event()? {
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break;
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}
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}
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EventSource::NameserverScheme => dnsd.on_nameserver_event()?,
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EventSource::Timer => dnsd.on_time_event()?,
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EventSource::Other => dnsd.on_unknown_fd_event(event.fd as RawFd)?,
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}
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}
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Ok(())
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}
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fn main() {
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redox_daemon::Daemon::new(move |daemon| {
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logger::init_logger("dnsd");
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if let Err(err) = run(daemon) {
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error!("dnsd: {}", err);
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process::exit(1);
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}
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process::exit(0);
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})
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.expect("dnsd: failed to daemonize");
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}
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event::user_data! {
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enum EventSource {
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DnsScheme,
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NameserverScheme,
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Timer,
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Other,
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}
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}
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@@ -1,610 +0,0 @@
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use std::borrow::ToOwned;
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use std::collections::btree_map::Entry;
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use std::collections::{BTreeMap, BTreeSet};
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use std::collections::{HashMap, VecDeque};
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use std::fs::File;
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use std::io::{Read, Write};
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use std::mem;
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use std::net::Ipv4Addr;
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use std::os::unix::io::RawFd;
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use std::rc::Rc;
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use std::str;
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use std::str::FromStr;
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use libredox::flag;
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use redox_scheme::scheme::{IntoTag, Op, OpRead, SchemeSync};
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use redox_scheme::{CallerCtx, Id, OpenResult, RequestKind, Response, SignalBehavior};
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use syscall::data::TimeSpec;
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use syscall::schemev2::NewFdFlags;
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use syscall::{self, EAGAIN, ECANCELED, ENOSYS, EWOULDBLOCK};
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use syscall::{Error as SyscallError, EventFlags as SyscallEventFlags, Result as SyscallResult};
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use event::EventQueue;
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use redox_netstack::error::{Error, Result, ResultExt};
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use dns_parser::{Builder, Packet as DNSPacket, RRData, ResponseCode};
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use dns_parser::{QueryClass, QueryType};
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use crate::EventSource;
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enum DnsFile {
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Resolved { data: Rc<[u8]>, pos: usize },
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Waiting { domain: String },
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Timeout,
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Failed,
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}
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enum Domain {
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Resolved {
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data: Rc<[u8]>,
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},
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Requested {
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waiting_fds: BTreeSet<usize>,
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socket_fd: RawFd,
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},
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}
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enum DnsParsingResult {
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WakeUpFiles(BTreeSet<usize>),
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FailFiles(BTreeSet<usize>),
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}
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struct Domains {
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nameserver: Ipv4Addr,
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domains: BTreeMap<Rc<str>, Domain>,
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requests: BTreeMap<RawFd, Rc<str>>,
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resolved_timeouts: VecDeque<(TimeSpec, Rc<str>)>,
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requested_timeouts: VecDeque<(TimeSpec, Rc<str>)>,
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}
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impl Domains {
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fn new() -> Domains {
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let mut domains = Domains {
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nameserver: Ipv4Addr::new(8, 8, 8, 8),
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domains: BTreeMap::new(),
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requests: BTreeMap::new(),
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resolved_timeouts: VecDeque::new(),
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requested_timeouts: VecDeque::new(),
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};
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domains.update_nameserver();
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domains
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}
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pub fn update_nameserver(&mut self) {
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if let Ok(mut file) = File::open("/scheme/netcfg/resolv/nameserver") {
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let mut nameserver = String::new();
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if file.read_to_string(&mut nameserver).is_ok() {
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if let Some(line) = nameserver.lines().next() {
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if let Ok(ip) = Ipv4Addr::from_str(line) {
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trace!("Changing nameserver to {}", ip);
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self.nameserver = ip;
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}
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}
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}
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}
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}
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fn request_domain(&mut self, domain: &str, queue: &EventQueue<EventSource>) -> Option<RawFd> {
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trace!("Requesting domain {}", domain);
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let mut builder = Builder::new_query(1, true);
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builder.add_question(domain, QueryType::A, QueryClass::IN);
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let packet = builder.build().ok()?;
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let udp_fd = libredox::call::open(
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&format!("udp:{}:53", self.nameserver),
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libredox::flag::O_RDWR | libredox::flag::O_CREAT | libredox::flag::O_NONBLOCK,
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0,
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)
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.ok()?;
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if libredox::call::write(udp_fd, &packet) != Ok(packet.len()) {
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libredox::call::close(udp_fd).ok()?;
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return None;
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}
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queue
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.subscribe(udp_fd, EventSource::Other, event::EventFlags::READ)
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.ok()?;
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self.requests
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.insert(udp_fd as RawFd, domain.to_owned().into());
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Some(udp_fd as RawFd)
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}
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fn on_time_event(
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&mut self,
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cur_time: &TimeSpec,
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queue: &EventQueue<EventSource>,
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) -> Result<BTreeSet<usize>> {
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while let Some((timeout, domain)) = self.resolved_timeouts.pop_front() {
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if timeout.tv_sec > cur_time.tv_sec
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|| (timeout.tv_sec == cur_time.tv_sec && timeout.tv_nsec > cur_time.tv_nsec)
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{
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self.resolved_timeouts.push_front((timeout, domain));
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break;
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}
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trace!("Timing out resolved domain {:?}", domain);
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match self.domains.entry(domain) {
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Entry::Vacant(_) => {}
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Entry::Occupied(e) => {
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if let Domain::Resolved { .. } = *e.get() {
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e.remove();
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}
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}
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}
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}
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let mut fds_to_wakeup = BTreeSet::new();
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while let Some((timeout, domain)) = self.requested_timeouts.pop_front() {
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if timeout.tv_sec > cur_time.tv_sec
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|| (timeout.tv_sec == cur_time.tv_sec && timeout.tv_nsec > cur_time.tv_nsec)
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{
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self.requested_timeouts.push_front((timeout, domain));
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break;
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}
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trace!("Timing out requested domain {:?}", domain);
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match self.domains.entry(domain) {
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Entry::Vacant(_) => {}
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Entry::Occupied(e) => {
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if let Domain::Requested { .. } = *e.get() {
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if let Domain::Requested {
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mut waiting_fds,
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socket_fd,
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} = e.remove()
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{
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fds_to_wakeup.append(&mut waiting_fds);
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queue.unsubscribe(socket_fd as usize).map_err(|e| {
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Error::from_syscall_error(e.into(), "unsubscribe failure")
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})?;
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let _ = libredox::call::close(socket_fd as usize);
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}
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}
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}
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}
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}
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Ok(fds_to_wakeup)
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}
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fn on_fd_event(
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&mut self,
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fd: RawFd,
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cur_time: &TimeSpec,
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queue: &EventQueue<EventSource>,
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) -> Option<DnsParsingResult> {
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let e = match self.requests.entry(fd) {
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Entry::Vacant(_) => {
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return None;
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}
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Entry::Occupied(e) => e,
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};
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let mut buf = [0u8; 0x1000];
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let readed = libredox::call::read(fd as usize, &mut buf).ok()?;
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if readed == 0 {
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return None;
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}
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let pkt = DNSPacket::parse(&buf).ok()?;
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if pkt.header.response_code != ResponseCode::NoError || pkt.answers.is_empty() {
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if let Some(query) = pkt.questions.iter().next() {
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if query.qname.to_string().to_lowercase() == e.get().as_ref() {
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queue.unsubscribe(fd as usize).ok()?;
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libredox::call::close(fd as usize).ok()?;
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let domain = e.remove();
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self.requested_timeouts
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.retain(|&(_, ref d)| d.as_ref() != domain.as_ref());
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if let Entry::Occupied(e) = self.domains.entry(domain) {
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let domain_data = e.remove();
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return if let Domain::Requested { waiting_fds, .. } = domain_data {
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Some(DnsParsingResult::FailFiles(waiting_fds))
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} else {
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None
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};
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}
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}
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}
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return None;
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}
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let mut result = String::new();
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for answer in pkt.answers {
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if answer.name.to_string().to_lowercase() != e.get().as_ref() {
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continue;
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}
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if let RRData::A(ip) = answer.data {
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result += &format!("{}\n", ip);
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}
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}
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if result.is_empty() {
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return None;
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}
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let data = Rc::from(result.into_bytes());
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queue.unsubscribe(fd as usize).ok()?;
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libredox::call::close(fd as usize).ok()?;
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let domain = e.remove();
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let mut domain_data = Domain::Resolved { data };
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trace!("On FD event {} {} resolved", fd, domain);
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let mut resolved_timeout = *cur_time;
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resolved_timeout.tv_sec += Dnsd::RESOLVED_TIMEOUT_S;
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self.resolved_timeouts
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.push_back((resolved_timeout, Rc::clone(&domain)));
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self.requested_timeouts
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.retain(|&(_, ref d)| d.as_ref() != domain.as_ref());
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match self.domains.entry(domain) {
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Entry::Vacant(e) => {
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e.insert(domain_data);
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None
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}
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Entry::Occupied(mut e) => {
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mem::swap(e.get_mut(), &mut domain_data);
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if let Domain::Requested { waiting_fds, .. } = domain_data {
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Some(DnsParsingResult::WakeUpFiles(waiting_fds))
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} else {
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None
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}
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}
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}
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}
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fn file_from_domain(
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&mut self,
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domain: &str,
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fd: usize,
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cur_time: &TimeSpec,
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queue: &EventQueue<EventSource>,
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) -> DnsFile {
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if let Some(domain_data) = self.domains.get_mut(domain) {
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match *domain_data {
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Domain::Resolved { ref data } => DnsFile::Resolved {
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data: Rc::clone(data),
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pos: 0,
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},
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Domain::Requested {
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ref mut waiting_fds,
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..
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} => {
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waiting_fds.insert(fd);
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DnsFile::Waiting {
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domain: domain.to_owned(),
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}
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}
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}
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} else {
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if let Some(socket_fd) = self.request_domain(domain, queue) {
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let mut waiting_fds = BTreeSet::new();
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let domain = domain.to_owned().into();
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waiting_fds.insert(fd);
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self.domains.insert(
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Rc::clone(&domain),
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Domain::Requested {
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waiting_fds,
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socket_fd,
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},
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);
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let mut timeout = *cur_time;
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timeout.tv_sec += Dnsd::REQUEST_TIMEOUT_S;
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self.requested_timeouts.push_back((timeout, domain));
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}
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DnsFile::Waiting {
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domain: domain.to_owned(),
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}
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}
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}
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fn unwait_fd(&mut self, domain: &str, fd: usize) {
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if let Some(domain_data) = self.domains.get_mut(domain) {
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if let Domain::Requested {
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ref mut waiting_fds,
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..
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} = *domain_data
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{
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waiting_fds.remove(&fd);
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}
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}
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}
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}
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pub struct Dnsd<'q> {
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scheme_socket: redox_scheme::Socket,
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time_file: File,
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queue: &'q EventQueue<EventSource>,
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files: BTreeMap<usize, DnsFile>,
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domains: Domains,
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blocked_ids: HashMap<Id, (CallerCtx, OpRead)>,
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blocked_fds: HashMap<usize, Vec<Id>>,
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next_fd: usize,
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}
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impl<'q> Dnsd<'q> {
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const RESOLVED_TIMEOUT_S: i64 = 5 * 60;
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const REQUEST_TIMEOUT_S: i64 = 30;
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const TIME_EVENT_TIMEOUT_S: i64 = 5;
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pub fn new(
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scheme_socket: redox_scheme::Socket,
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time_file: File,
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queue: &'q EventQueue<EventSource>,
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) -> Self {
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Dnsd {
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scheme_socket,
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time_file,
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queue,
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files: BTreeMap::new(),
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domains: Domains::new(),
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blocked_ids: HashMap::new(),
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blocked_fds: HashMap::new(),
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next_fd: 1,
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}
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}
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pub fn on_time_event(&mut self) -> Result<()> {
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let mut time = TimeSpec::default();
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if self.time_file.read(&mut time)? < mem::size_of::<TimeSpec>() {
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return Err(Error::from_syscall_error(
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syscall::Error::new(syscall::EBADF),
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"Can't read current time",
|
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));
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}
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let fds_to_wakeup = self.domains.on_time_event(&time, self.queue)?;
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if !fds_to_wakeup.is_empty() {
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for fd in &fds_to_wakeup {
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if let Some(file) = self.files.get_mut(fd) {
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*file = DnsFile::Timeout;
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}
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}
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self.wakeup_fds(&fds_to_wakeup)?;
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}
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time.tv_sec += Dnsd::TIME_EVENT_TIMEOUT_S;
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self.time_file
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.write_all(&time)
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.map_err(|e| Error::from_io_error(e, "Failed to write to time file"))?;
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Ok(())
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}
|
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|
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pub fn on_dns_file_event(&mut self) -> Result<bool> {
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loop {
|
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let req = match self.scheme_socket.next_request(SignalBehavior::Restart) {
|
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Ok(None) => {
|
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//TODO: Cleanup must occur
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return Ok(false);
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}
|
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Ok(Some(req)) => req,
|
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Err(err) if err.errno == EWOULDBLOCK || err.errno == EAGAIN => {
|
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return Ok(true);
|
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}
|
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Err(err) => return Err(err).context("scheme read error"),
|
||||
};
|
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let req = match req.kind() {
|
||||
RequestKind::Call(call) => call,
|
||||
RequestKind::OnClose { id } => {
|
||||
self.on_close(id);
|
||||
continue;
|
||||
}
|
||||
RequestKind::Cancellation(req) => {
|
||||
if let Some((_, op)) = self.blocked_ids.remove(&req.id) {
|
||||
if let Some(blocked) = self.blocked_fds.get_mut(&op.fd) {
|
||||
blocked.retain(|id| *id != req.id);
|
||||
}
|
||||
self.scheme_socket
|
||||
.write_response(Response::err(ECANCELED, op), SignalBehavior::Restart)
|
||||
.context("scheme write fail")?;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
_ => continue,
|
||||
};
|
||||
let ctx = req.caller();
|
||||
|
||||
let resp = match req.op() {
|
||||
Err(req) => Response::err(ENOSYS, req),
|
||||
Ok(Op::Read(mut op)) => {
|
||||
let fd = op.fd;
|
||||
// TODO: nonblock read flag to bypass blocking
|
||||
let res = self.read(fd, op.buf(), 0, 0, &ctx);
|
||||
if res == Err(SyscallError::new(EWOULDBLOCK)) {
|
||||
let id = op.req_id();
|
||||
self.blocked_ids.insert(id, (ctx, op));
|
||||
self.blocked_fds.entry(fd).or_default().push(id);
|
||||
continue;
|
||||
} else {
|
||||
Response::new(res, op)
|
||||
}
|
||||
}
|
||||
Ok(op) => op.handle_sync(ctx, self),
|
||||
};
|
||||
self.scheme_socket
|
||||
.write_response(resp, SignalBehavior::Restart)
|
||||
.context("scheme write fail")?;
|
||||
}
|
||||
}
|
||||
|
||||
pub fn on_unknown_fd_event(&mut self, fd: RawFd) -> Result<()> {
|
||||
trace!("Unknown fd event {}", fd);
|
||||
let cur_time = libredox::call::clock_gettime(libredox::flag::CLOCK_MONOTONIC)
|
||||
.map_err(|e| Error::from_syscall_error(e.into(), "Can't get time"))?;
|
||||
// TODO
|
||||
let cur_time = TimeSpec {
|
||||
tv_sec: cur_time.tv_sec,
|
||||
tv_nsec: cur_time.tv_nsec as _,
|
||||
};
|
||||
|
||||
match self.domains.on_fd_event(fd, &cur_time, self.queue) {
|
||||
Some(DnsParsingResult::FailFiles(fds_to_fail)) => {
|
||||
for fd in &fds_to_fail {
|
||||
if let Some(file) = self.files.get_mut(fd) {
|
||||
*file = DnsFile::Failed;
|
||||
}
|
||||
}
|
||||
self.wakeup_fds(&fds_to_fail)?;
|
||||
}
|
||||
Some(DnsParsingResult::WakeUpFiles(fds_to_wakeup)) => {
|
||||
self.wakeup_fds(&fds_to_wakeup)?;
|
||||
}
|
||||
None => {}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn on_nameserver_event(&mut self) -> Result<()> {
|
||||
self.domains.update_nameserver();
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn wakeup_fds(&mut self, fds_to_wakeup: &BTreeSet<usize>) -> Result<()> {
|
||||
for fd in fds_to_wakeup {
|
||||
let Some(affected) = self.blocked_fds.remove(&fd) else {
|
||||
continue;
|
||||
};
|
||||
for id in affected {
|
||||
let Some((ctx, mut op)) = self.blocked_ids.remove(&id) else {
|
||||
continue;
|
||||
};
|
||||
// TODO: deduplicate code
|
||||
let fd = op.fd;
|
||||
// TODO: nonblock read flag to bypass blocking
|
||||
let res = self.read(fd, op.buf(), 0, 0, &ctx);
|
||||
let resp = if res == Err(SyscallError::new(EWOULDBLOCK)) {
|
||||
self.blocked_ids.insert(id, (ctx, op));
|
||||
self.blocked_fds.entry(fd).or_default().push(id);
|
||||
continue;
|
||||
} else {
|
||||
Response::new(res, op)
|
||||
};
|
||||
self.scheme_socket
|
||||
.write_response(resp, SignalBehavior::Restart)
|
||||
.context("scheme write fail")?;
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn validate_domain(domain: &str) -> bool {
|
||||
if domain.len() > 256 {
|
||||
return false;
|
||||
}
|
||||
|
||||
for part in domain.split('.') {
|
||||
if part.len() >= 63 {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
impl Dnsd<'_> {
|
||||
fn on_close(&mut self, fd: usize) {
|
||||
trace!("Close {}", fd);
|
||||
let Some(file) = self.files.get_mut(&fd) else {
|
||||
return;
|
||||
};
|
||||
|
||||
if let DnsFile::Waiting { ref domain } = *file {
|
||||
self.domains.unwait_fd(domain, fd);
|
||||
}
|
||||
|
||||
self.files.remove(&fd);
|
||||
}
|
||||
}
|
||||
|
||||
impl SchemeSync for Dnsd<'_> {
|
||||
fn open(&mut self, url: &str, _flags: usize, _ctx: &CallerCtx) -> SyscallResult<OpenResult> {
|
||||
let domain = url.to_lowercase();
|
||||
if domain.is_empty() || !Dnsd::validate_domain(&domain) {
|
||||
return Err(SyscallError::new(syscall::EINVAL));
|
||||
}
|
||||
let fd = self.next_fd;
|
||||
self.next_fd += 1;
|
||||
let cur_time = libredox::call::clock_gettime(flag::CLOCK_MONOTONIC)?;
|
||||
let dns_file = self.domains.file_from_domain(
|
||||
&domain,
|
||||
fd,
|
||||
&TimeSpec {
|
||||
tv_sec: cur_time.tv_sec,
|
||||
tv_nsec: cur_time.tv_nsec as i32,
|
||||
},
|
||||
self.queue,
|
||||
);
|
||||
self.files.insert(fd, dns_file);
|
||||
trace!("Open {} {}", &domain, fd);
|
||||
Ok(OpenResult::ThisScheme {
|
||||
number: fd,
|
||||
flags: NewFdFlags::empty(),
|
||||
})
|
||||
}
|
||||
|
||||
fn write(
|
||||
&mut self,
|
||||
_fd: usize,
|
||||
_buf: &[u8],
|
||||
_off: u64,
|
||||
_flags: u32,
|
||||
_ctx: &CallerCtx,
|
||||
) -> SyscallResult<usize> {
|
||||
Err(SyscallError::new(syscall::EINVAL))
|
||||
}
|
||||
|
||||
fn read(
|
||||
&mut self,
|
||||
fd: usize,
|
||||
buf: &mut [u8],
|
||||
_off: u64,
|
||||
_flags: u32,
|
||||
_ctx: &CallerCtx,
|
||||
) -> SyscallResult<usize> {
|
||||
trace!("Read {}", fd);
|
||||
let file = self
|
||||
.files
|
||||
.get_mut(&fd)
|
||||
.ok_or_else(|| SyscallError::new(syscall::EBADF))?;
|
||||
|
||||
let cur_time = libredox::call::clock_gettime(flag::CLOCK_MONOTONIC)?;
|
||||
|
||||
if let DnsFile::Waiting { ref domain } = *file {
|
||||
*file = self.domains.file_from_domain(
|
||||
domain,
|
||||
fd,
|
||||
&TimeSpec {
|
||||
tv_sec: cur_time.tv_sec,
|
||||
tv_nsec: cur_time.tv_nsec as i32,
|
||||
},
|
||||
self.queue,
|
||||
);
|
||||
}
|
||||
|
||||
match *file {
|
||||
DnsFile::Resolved {
|
||||
ref data,
|
||||
ref mut pos,
|
||||
} => {
|
||||
let mut i = 0;
|
||||
while i < buf.len() && *pos < data.len() {
|
||||
buf[i] = data[*pos];
|
||||
i += 1;
|
||||
*pos += 1;
|
||||
}
|
||||
Ok(i)
|
||||
}
|
||||
DnsFile::Waiting { .. } => Err(SyscallError::new(syscall::EWOULDBLOCK)),
|
||||
DnsFile::Timeout => Err(SyscallError::new(syscall::ETIMEDOUT)),
|
||||
DnsFile::Failed => Err(SyscallError::new(syscall::ENODATA)),
|
||||
}
|
||||
}
|
||||
|
||||
fn fevent(
|
||||
&mut self,
|
||||
_fd: usize,
|
||||
_events: SyscallEventFlags,
|
||||
_ctx: &CallerCtx,
|
||||
) -> SyscallResult<SyscallEventFlags> {
|
||||
Ok(SyscallEventFlags::empty())
|
||||
}
|
||||
|
||||
fn fsync(&mut self, _fd: usize, _ctx: &CallerCtx) -> SyscallResult<()> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user