forked from coredns/coredns
/
setup.go
100 lines (83 loc) · 1.85 KB
/
setup.go
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package dnstap
import (
"fmt"
"io"
"log"
"strings"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/dnstap/dnstapio"
"github.com/coredns/coredns/plugin/dnstap/out"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/mholt/caddy"
"github.com/mholt/caddy/caddyfile"
)
func init() {
caddy.RegisterPlugin("dnstap", caddy.Plugin{
ServerType: "dns",
Action: wrapSetup,
})
}
func wrapSetup(c *caddy.Controller) error {
if err := setup(c); err != nil {
return plugin.Error("dnstap", err)
}
return nil
}
type config struct {
target string
socket bool
full bool
}
func parseConfig(d *caddyfile.Dispenser) (c config, err error) {
d.Next() // directive name
if !d.Args(&c.target) {
return c, d.ArgErr()
}
if strings.HasPrefix(c.target, "tcp://") {
// remote IP endpoint
servers, err := dnsutil.ParseHostPortOrFile(c.target[6:])
if err != nil {
return c, d.ArgErr()
}
c.target = servers[0]
} else {
// default to UNIX socket
if strings.HasPrefix(c.target, "unix://") {
c.target = c.target[7:]
}
c.socket = true
}
c.full = d.NextArg() && d.Val() == "full"
return
}
func setup(c *caddy.Controller) error {
conf, err := parseConfig(&c.Dispenser)
if err != nil {
return err
}
dnstap := Dnstap{Pack: conf.full}
var o io.WriteCloser
if conf.socket {
o, err = out.NewSocket(conf.target)
if err != nil {
log.Printf("[WARN] Can't connect to %s at the moment: %s", conf.target, err)
}
} else {
o = out.NewTCP(conf.target)
}
dio := dnstapio.New(o)
dnstap.IO = dio
c.OnShutdown(func() error {
if err := dio.Close(); err != nil {
return fmt.Errorf("dnstap io routine: %s", err)
}
return nil
})
dnsserver.GetConfig(c).AddPlugin(
func(next plugin.Handler) plugin.Handler {
dnstap.Next = next
return dnstap
})
return nil
}