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Add new NetIf variant to NatResolver for IP resolution via network interface #10922

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Sep 21, 2024
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1 change: 1 addition & 0 deletions Cargo.lock

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1 change: 1 addition & 0 deletions crates/net/nat/Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ serde_with = { workspace = true, optional = true }
thiserror.workspace = true
tokio = { workspace = true, features = ["time"] }
if-addrs.workspace = true
tracing.workspace = true

[dev-dependencies]
reth-tracing.workspace = true
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12 changes: 12 additions & 0 deletions crates/net/nat/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,9 @@ use std::{
task::{Context, Poll},
time::Duration,
};
use tracing::error;

use crate::net_if::resolve_net_if_ip;
#[cfg(feature = "serde")]
use serde_with::{DeserializeFromStr, SerializeDisplay};

Expand All @@ -48,6 +50,8 @@ pub enum NatResolver {
PublicIp,
/// Use the given [`IpAddr`]
ExternalIp(IpAddr),
/// Resolve external IP via the network interface.
NetIf,
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/// Resolve nothing
None,
}
Expand All @@ -66,6 +70,7 @@ impl fmt::Display for NatResolver {
Self::Upnp => f.write_str("upnp"),
Self::PublicIp => f.write_str("publicip"),
Self::ExternalIp(ip) => write!(f, "extip:{ip}"),
Self::NetIf => f.write_str("networkinterface"),
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Self::None => f.write_str("none"),
}
}
Expand Down Expand Up @@ -185,6 +190,13 @@ pub async fn external_addr_with(resolver: NatResolver) -> Option<IpAddr> {
match resolver {
NatResolver::Any | NatResolver::Upnp | NatResolver::PublicIp => resolve_external_ip().await,
NatResolver::ExternalIp(ip) => Some(ip),
NatResolver::NetIf => match resolve_net_if_ip(DEFAULT_NET_IF_NAME) {
Ok(ip) => Some(ip),
Err(err) => {
error!("Failed to resolve network interface IP: {}", err);
None
Comment on lines +197 to +198
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@emhane Alternatively we could panic!(....) instead here if I'm understanding #10922 (comment) correctly. Have decided to just log an error here but LMKWYT

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this should just return None if this fails

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Yes this is the behavior that I had originally #10922 (comment)

@mattsse @emhane Do we want to log an error if this fails?

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Do we want to log an error if this fails?

doesn't hurt but not strictly required

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Right so does the above current diff SGTY? We log an error and return None on failure. Just checking your comment here #10922 (comment) wasn't referring to something else

}
},
NatResolver::None => None,
}
}
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