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transports/dns: Document caveats of using the trust-dns-resolver crate (#2114)

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Ref https://github.com/libp2p/rust-libp2p/issues/2064
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Oliver Wangler 2021-06-30 21:02:20 +02:00 committed by GitHub
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transports/dns/src/lib.rs
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@ -36,6 +36,22 @@
//! features. For more information about these features, please
//! refer to the documentation of [trust-dns-resolver].
//!
//! On Unix systems, if no custom configuration is given, [trust-dns-resolver]
//! will try to parse the `/etc/resolv.conf` file. This approach comes with a
//! few caveats to be aware of:
//! 1) This fails (panics even!) if `/etc/resolv.conf` does not exist. This is
//! the case on all versions of Android.
//! 2) DNS configuration is only evaluated during startup. Runtime changes are
//! thus ignored.
//! 3) DNS resolution is obviously done in process and consequently not using
//! any system APIs (like libc's `gethostbyname`). Again this is
//! problematic on platforms like Android, where there's a lot of
//! complexity hidden behind the system APIs.
//! If the implementation requires different characteristics, one should
//! consider providing their own implementation of [`GenDnsConfig`] or use
//! platform specific APIs to extract the host's DNS configuration (if possible)
//! and provide a custom [`ResolverConfig`].
//!
//![trust-dns-resolver]: https://docs.rs/trust-dns-resolver/latest/trust_dns_resolver/#dns-over-tls-and-dns-over-https
use futures::{prelude::*, future::BoxFuture};