dnsur

An asynchronous DNS stub resolver.

Motivation

The monoio async runtime does not ship with an asynchronous DNS resolver, and rather relies on a threadpool to handle the blocking calls (like most other runtimes). This library aims to do the resolution in an async manner, including the file system access (using io_uring).

Details

• /etc/hosts and /etc/resolv.conf are parsed to build the configuration.
• The entries in the hosts are tried first, and if not present, the nameservers from resolv.conf will be queried.
• Querying of the nameservers is done sequentially (i.e. we query the second nameserver only if the first one has failed).
• A and AAAA records are queried concurrently.
• Default UDP buffer size is 1232 bytes.

Non-standard behavior

TODO

• Support for rotate

Status

Hic Sunt Dracones

License

Mozilla Public License Version 2.0. See the LICENSE file for details.

Acknowledgement

This library is inspired by async-dns