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Stefan Bühler 5 years ago
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2
.gitignore vendored
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/target
**/*.rs.bk

157
Cargo.lock generated
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[[package]]
name = "ansi_term"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "atty"
version = "0.2.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
"termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "bitflags"
version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "byteorder"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "clap"
version = "2.32.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
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"bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
"strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
"textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
"unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
"vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "libc"
version = "0.2.43"
source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "libresolv-sys"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "lookup"
version = "0.1.0"
dependencies = [
"clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
"resolv 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "redox_syscall"
version = "0.1.40"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "redox_termios"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "resolv"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
"libresolv-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "strsim"
version = "0.7.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "termion"
version = "1.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
"redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
"redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "textwrap"
version = "0.10.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "unicode-width"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "vec_map"
version = "0.8.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "winapi"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"checksum clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b957d88f4b6a63b9d70d5f454ac8011819c6efa7727858f458ab71c756ce2d3e"
"checksum libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)" = "76e3a3ef172f1a0b9a9ff0dd1491ae5e6c948b94479a3021819ba7d860c8645d"
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9
Cargo.toml
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[package]
name = "lookup"
version = "0.1.0"
authors = ["Stefan Bühler <stbuehler@web.de>"]
description = "Lookup IPv4 and IPv6 addresses for a hostname"
[dependencies]
resolv = "0.1.3"
clap = "2.32.0"

122
src/main.rs
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#[macro_use]
extern crate clap;
extern crate resolv;
use resolv::{
Resolver,
Class,
Section,
error::{
Error,
ResolutionError,
},
record::{
A,
AAAA,
},
};
use std::process::exit;
use std::ffi::OsStr;
use std::os::unix::ffi::OsStrExt;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use std::fmt;
/// Workaround https://github.com/mikedilger/resolv-rs/issues/1
///
/// When it gets fixed, this will simply call the inner `.next()` a few
/// times too often, which should hurt much.
struct FixedIterator<'a, T: resolv::record::RecordData>(resolv::RecordItems<'a, T>, usize);
impl<'a, T: resolv::record::RecordData> Iterator for FixedIterator<'a, T> {
type Item = resolv::Record<T>;
fn next(&mut self) -> Option<Self::Item> {
while self.1 > 0 {
self.1 -= 1;
if let Some(r) = self.0.next() {
return Some(r);
}
}
return None;
}
}
impl<'a, T: resolv::record::RecordData> FixedIterator<'a, T> {
pub fn answers(response: &'a mut resolv::Response) -> Self {
let count = response.get_section_count(Section::Answer);
FixedIterator(response.answers::<T>(), count)
}
}
pub trait AddressRecord: resolv::record::RecordData {
type Address: Into<IpAddr> + fmt::Display + fmt::Debug;
fn address(&self) -> Self::Address;
}
impl AddressRecord for A {
type Address = Ipv4Addr;
fn address(&self) -> Ipv4Addr {
self.address
}
}
impl AddressRecord for AAAA {
type Address = Ipv6Addr;
fn address(&self) -> Ipv6Addr {
self.address
}
}
fn run<R: AddressRecord>(resolver: &mut resolv::Resolver, name: &OsStr) {
match resolver.query(name.as_bytes(), Class::IN, R::get_record_type()) {
Ok(mut response) => {
for answer in FixedIterator::<R>::answers(&mut response) {
println!("{}", answer.data.address());
}
},
Err(Error::Resolver(ResolutionError::HostNotFound)) => {
eprintln!("Host not found: {:?}", name);
exit(0);
},
Err(Error::Resolver(ResolutionError::NoData)) => {
// empty answer is perfectly fine
},
Err(e) => {
eprintln!("Failed looking up {:?}: {}", name, e);
exit(1);
},
}
}
fn main() {
let app = clap_app!(("lookup") =>
(version: crate_version!())
(author: crate_authors!("\n"))
(about: crate_description!())
(@arg IPv4: short("4") conflicts_with("IPv6") "Query only IPv4 records (A)")
(@arg IPv6: short("6") "Query only IPv6 records (AAAA)")
(@arg NAME: +required "Name to lookup")
);
let matches = app.get_matches();
let ipv4_only = matches.is_present("IPv4");
let ipv6_only = matches.is_present("IPv6");
let name = matches.value_of_os("NAME").unwrap();
let mut resolver = Resolver::new().unwrap_or_else(|| {
eprintln!("Couldn't initialize resolver");
exit(1);
});
if !ipv6_only {
run::<A>(&mut resolver, name);
}
if !ipv4_only {
run::<AAAA>(&mut resolver, name);
}
}
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