mirror of
https://github.com/fluencelabs/rust-libp2p
synced 2025-06-02 04:31:21 +00:00
44 lines
1.9 KiB
Rust
44 lines
1.9 KiB
Rust
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// 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`], return
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/// a translated [`Multiaddr`] which has the first IP address translated by the
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/// corresponding one from `observed`.
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///
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/// This is a mixed-mode translation, i.e. an IPv4 address may be replaced by
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/// an IPv6 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(_) => 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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_ => None
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}
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_ => None
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})
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}
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// TODO: add tests
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