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DNS-Ear

DNS-Ear listens to incoming DNS queries. Useful for DNS exfiltration in environments, where possibilities to send out requests are limited.

Important: DNS-Ear requires root privileges to listen to default DNS port 53.

Usage

USAGE:
    dns-ear [FLAGS] [OPTIONS]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information
    -v, --verbose    Enable verbose output. -v for INFO, -vv for DEBUG output

OPTIONS:
    -a, --addr <addr>...       Listening address for DNS queries. Accepts both ipv4 and ipv6 formats. Could be specified
                               multiple times. [default: 0.0.0.0]
    -f, --filter <filter>      Filter queries by regex.
    -l, --logfile <logfile>    Log file to write query log to. [default: queries.log]
    -p, --port <port>          Listening port for DNS queries [default: 53]

Parameters

  • -a, --addr specifies ipv4/ipv6 addresses to listen to. Could be provided multiple times. Default: 0.0.0.0.
  • -f, --filter spicifies regex for filtering incoming queries. DNS-Ear does not reply to queries that do not match the specified filter. Example: .*.dns.yourdomain.com. Use '.*' to disable all filtering.
  • -l, --logfile specify the log filespecifies to write incoming queries to. Default: queries.log
  • -p, --port specifies the listening port. Default: 53
  • -v, --verbose enables the verbose output. Use -v for INFO and -vv for DEBUG outputs.

Important: using '.*' filter for public networks is not recommended due to high amount of noise.

Installing

Download a binary for the operation system of your choice from the project releases page.

(Alternative) Building

DNS-Ear requires a rust distribution to be present in your system for building the project.

$ RUSTFLAGS='-C link-arg=-s' cargo build --release -p dns-ear

Running

$ sudo ./target/release/dns-ear -p 53 -a 0.0.0.0 -l queries.log -f .*.dns.example.com

Limitations

Although DNS-Ear is capable of logging any type of query supported by the original trust-dns implementation, it only sends a proper response to A and AAAA queries.

Contributing

Contributions are welcome!

Disclaimer

This project is inspired by dnsbin. The motivation was to create an alternative that is distributed in binaries which simplifies use.

The code uses trust-dns libraries and is heavily inspired by its named binary.

License

Licensed under MIT license.