f3134da45e
* Clean up tests logging This cleans up the travis logs so you can see the failures better. Older tests in tests/ would call log.SetOutput(ioutil.Discard) in a haphazard way. This add log.Discard and put an `init` function in each package's dir (no way to do this globally). The cleanup in tests/ is clear. All plugins also got this init function to have some uniformity and kill any (future) logging there in the tests as well. There is a one-off in pkg/healthcheck because that does log. Signed-off-by: Miek Gieben <miek@miek.nl> * bring back original log_test.go Signed-off-by: Miek Gieben <miek@miek.nl> * suppress logging here as well Signed-off-by: Miek Gieben <miek@miek.nl>
dnstap
Name
dnstap - enable logging to dnstap.
Description
dnstap is a flexible, structured binary log format for DNS software: http://dnstap.info. With this plugin you make CoreDNS output dnstap logging.
Note that there is an internal buffer, so expect at least 13 requests before the server sends its dnstap messages to the socket.
Syntax
dnstap SOCKET [full]
- SOCKET is the socket path supplied to the dnstap command line tool.
fullto include the wire-format DNS message.
Examples
Log information about client requests and responses to /tmp/dnstap.sock.
dnstap /tmp/dnstap.sock
Log information including the wire-format DNS message about client requests and responses to /tmp/dnstap.sock.
dnstap unix:///tmp/dnstap.sock full
Log to a remote endpoint.
dnstap tcp://127.0.0.1:6000 full
Command Line Tool
Dnstap has a command line tool that can be used to inspect the logging. The tool can be found at Github: https://github.com/dnstap/golang-dnstap. It's written in Go.
The following command listens on the given socket and decodes messages to stdout.
$ dnstap -u /tmp/dnstap.sock
The following command listens on the given socket and saves message payloads to a binary dnstap-format log file.
$ dnstap -u /tmp/dnstap.sock -w /tmp/test.dnstap
Listen for dnstap messages on port 6000.
$ dnstap -l 127.0.0.1:6000
Using Dnstap in your plugin
import (
"github.com/coredns/coredns/plugin/dnstap"
"github.com/coredns/coredns/plugin/dnstap/msg"
)
func (h Dnstap) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
// log client query to Dnstap
if t := dnstap.TapperFromContext(ctx); t != nil {
b := msg.New().Time(time.Now()).Addr(w.RemoteAddr())
if t.Pack() {
b.Msg(r)
}
if m, err := b.ToClientQuery(); err == nil {
t.TapMessage(m)
}
}
// ...
}