Stefan Bühler
4 years ago
commit
577a137c62
4 changed files with 290 additions and 0 deletions
@ -0,0 +1,157 @@
|
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[[package]] |
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name = "ansi_term" |
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version = "0.11.0" |
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[[package]] |
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name = "atty" |
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[[package]] |
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[[package]] |
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] |
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[[package]] |
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name = "lookup" |
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] |
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name = "redox_syscall" |
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[[package]] |
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name = "redox_termios" |
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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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dependencies = [ |
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"redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)", |
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] |
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[[package]] |
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name = "resolv" |
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version = "0.1.3" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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[[package]] |
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name = "strsim" |
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version = "0.7.0" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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[[package]] |
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name = "termion" |
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version = "1.5.1" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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dependencies = [ |
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"libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)", |
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"redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)", |
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"redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)", |
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] |
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[[package]] |
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name = "textwrap" |
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version = "0.10.0" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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dependencies = [ |
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"unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)", |
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] |
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[[package]] |
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name = "unicode-width" |
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version = "0.1.5" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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[[package]] |
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name = "vec_map" |
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version = "0.8.1" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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name = "winapi-x86_64-pc-windows-gnu" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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@ -0,0 +1,9 @@
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[package] |
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name = "lookup" |
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version = "0.1.0" |
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authors = ["Stefan Bühler <stbuehler@web.de>"] |
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description = "Lookup IPv4 and IPv6 addresses for a hostname" |
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[dependencies] |
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resolv = "0.1.3" |
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clap = "2.32.0" |
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@ -0,0 +1,122 @@
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#[macro_use] |
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extern crate clap; |
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extern crate resolv; |
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use resolv::{ |
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Resolver, |
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Class, |
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Section, |
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error::{ |
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Error, |
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ResolutionError, |
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}, |
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record::{ |
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A, |
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AAAA, |
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}, |
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}; |
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use std::process::exit; |
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use std::ffi::OsStr; |
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use std::os::unix::ffi::OsStrExt; |
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use std::net::{IpAddr, Ipv4Addr, Ipv6Addr}; |
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use std::fmt; |
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/// Workaround https://github.com/mikedilger/resolv-rs/issues/1
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///
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/// When it gets fixed, this will simply call the inner `.next()` a few
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/// times too often, which should hurt much.
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struct FixedIterator<'a, T: resolv::record::RecordData>(resolv::RecordItems<'a, T>, usize); |
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impl<'a, T: resolv::record::RecordData> Iterator for FixedIterator<'a, T> { |
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type Item = resolv::Record<T>; |
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fn next(&mut self) -> Option<Self::Item> { |
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while self.1 > 0 { |
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self.1 -= 1; |
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if let Some(r) = self.0.next() { |
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return Some(r); |
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} |
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} |
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return None; |
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} |
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} |
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impl<'a, T: resolv::record::RecordData> FixedIterator<'a, T> { |
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pub fn answers(response: &'a mut resolv::Response) -> Self { |
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let count = response.get_section_count(Section::Answer); |
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FixedIterator(response.answers::<T>(), count) |
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} |
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} |
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pub trait AddressRecord: resolv::record::RecordData { |
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type Address: Into<IpAddr> + fmt::Display + fmt::Debug; |
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fn address(&self) -> Self::Address; |
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} |
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impl AddressRecord for A { |
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type Address = Ipv4Addr; |
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fn address(&self) -> Ipv4Addr { |
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self.address |
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} |
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} |
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impl AddressRecord for AAAA { |
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type Address = Ipv6Addr; |
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fn address(&self) -> Ipv6Addr { |
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self.address |
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} |
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} |
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fn run<R: AddressRecord>(resolver: &mut resolv::Resolver, name: &OsStr) { |
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match resolver.query(name.as_bytes(), Class::IN, R::get_record_type()) { |
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Ok(mut response) => { |
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for answer in FixedIterator::<R>::answers(&mut response) { |
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println!("{}", answer.data.address()); |
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} |
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}, |
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Err(Error::Resolver(ResolutionError::HostNotFound)) => { |
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eprintln!("Host not found: {:?}", name); |
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exit(0); |
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}, |
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Err(Error::Resolver(ResolutionError::NoData)) => { |
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// empty answer is perfectly fine
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}, |
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Err(e) => { |
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eprintln!("Failed looking up {:?}: {}", name, e); |
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exit(1); |
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}, |
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} |
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} |
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fn main() { |
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let app = clap_app!(("lookup") => |
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(version: crate_version!()) |
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(author: crate_authors!("\n")) |
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(about: crate_description!()) |
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(@arg IPv4: short("4") conflicts_with("IPv6") "Query only IPv4 records (A)") |
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(@arg IPv6: short("6") "Query only IPv6 records (AAAA)") |
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(@arg NAME: +required "Name to lookup") |
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); |
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let matches = app.get_matches(); |
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let ipv4_only = matches.is_present("IPv4"); |
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let ipv6_only = matches.is_present("IPv6"); |
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let name = matches.value_of_os("NAME").unwrap(); |
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let mut resolver = Resolver::new().unwrap_or_else(|| { |
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eprintln!("Couldn't initialize resolver"); |
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exit(1); |
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}); |
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if !ipv6_only { |
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run::<A>(&mut resolver, name); |
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} |
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if !ipv4_only { |
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run::<AAAA>(&mut resolver, name); |
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} |
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} |
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