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https://github.com/fluencelabs/rust-libp2p
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5861474d99
* core/src/translation: Add unit tests * core/src/translation: Support dns4 and dns6 Add dns4 and dns6 as valid protocol replacements for the origin address to construct external addresses of a given node. * core/nodes/network: %s/nat_translation/address_translation/ When receiving an observed address on a tcp connection that we initiated, the observed address contains our tcp dial port, not our tcp listen port. We know which port we are listening on, thereby we can replace the port within the observed address. When receiving an observed address on a tcp connection that we did **not** initiated, the observed address should contain our listening port. In case it differs from our listening port there might be a NAT along the path. With the above in mind, the function name `nat_translation` is misleading.
110 lines
4.5 KiB
Rust
110 lines
4.5 KiB
Rust
// Copyright 2019 Parity Technologies (UK) Ltd.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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use multiaddr::{Multiaddr, Protocol};
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/// Perform IP address translation.
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///
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/// Given an `original` [`Multiaddr`] and some `observed` [`Multiaddr`], replace the first protocol
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/// of the `original` with the first protocol of the `observed` [`Multiaddr`] and return this
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/// translated [`Multiaddr`].
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///
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/// This function can for example be useful when handling tcp connections. Tcp does not listen and
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/// dial on the same port by default. Thus when receiving an observed address on a connection that
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/// we initiated, it will contain our dialing port, not our listening port. We need to take the ip
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/// address or dns address from the observed address and the port from the original address.
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///
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/// This is a mixed-mode translation, i.e. an IPv4 / DNS4 address may be replaced by an IPv6 / DNS6
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/// address and vice versa.
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///
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/// If the first [`Protocol`]s are not IP addresses, `None` is returned instead.
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pub fn address_translation(original: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
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original.replace(0, move |proto| match proto {
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Protocol::Ip4(_) | Protocol::Ip6(_) | Protocol::Dns4(_) | Protocol::Dns6(_) => match observed.iter().next() {
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x @ Some(Protocol::Ip4(_)) => x,
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x @ Some(Protocol::Ip6(_)) => x,
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x @ Some(Protocol::Dns4(_)) => x,
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x @ Some(Protocol::Dns6(_)) => x,
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_ => None,
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},
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_ => None,
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})
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_address_translation() {
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struct Test {
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original: Multiaddr,
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observed: Multiaddr,
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expected: Multiaddr,
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}
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let tests = vec![
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// Basic ipv4.
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Test {
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original: "/ip4/192.0.2.1/tcp/1".parse().unwrap(),
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observed: "/ip4/192.0.2.2/tcp/2".parse().unwrap(),
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expected: "/ip4/192.0.2.2/tcp/1".parse().unwrap(),
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},
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// Basic ipv6.
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Test {
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original: "/ip6/2001:db8:0:0:0:0:0:0/tcp/1".parse().unwrap(),
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observed: "/ip6/2001:db8:0:0:0:0:0:1/tcp/2".parse().unwrap(),
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expected: "/ip6/2001:db8:0:0:0:0:0:1/tcp/1".parse().unwrap(),
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},
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// Ipv4 ipv6 mix.
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Test {
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original: "/ip4/192.0.2.1/tcp/1".parse().unwrap(),
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observed: "/ip6/2001:db8:0:0:0:0:0:1/tcp/2".parse().unwrap(),
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expected: "/ip6/2001:db8:0:0:0:0:0:1/tcp/1".parse().unwrap(),
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},
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// Ipv6 ipv4 mix.
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Test {
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original: "/ip6/2001:db8:0:0:0:0:0:0/tcp/1".parse().unwrap(),
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observed: "/ip4/192.0.2.2/tcp/2".parse().unwrap(),
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expected: "/ip4/192.0.2.2/tcp/1".parse().unwrap(),
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},
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// Dns.
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Test {
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original: "/dns4/foo/tcp/1".parse().unwrap(),
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observed: "/dns4/bar/tcp/2".parse().unwrap(),
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expected: "/dns4/bar/tcp/1".parse().unwrap(),
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},
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// Ipv4 Dns mix.
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Test {
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original: "/ip4/192.0.2.1/tcp/1".parse().unwrap(),
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observed: "/dns4/bar/tcp/2".parse().unwrap(),
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expected: "/dns4/bar/tcp/1".parse().unwrap(),
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},
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];
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for test in tests.iter() {
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assert_eq!(
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address_translation(&test.original, &test.observed),
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Some(test.expected.clone())
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);
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}
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}
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}
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