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package dnstap
import (
"net/url"
"os"
"strings"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
clog "github.com/coredns/coredns/plugin/pkg/log"
)
var log = clog.NewWithPlugin("dnstap")
func init() { plugin.Register("dnstap", setup) }
func parseConfig(c *caddy.Controller) ([]*Dnstap, error) {
dnstaps := []*Dnstap{}
for c.Next() { // directive name
d := Dnstap{}
endpoint := ""
args := c.RemainingArgs()
if len(args) == 0 {
return nil, c.ArgErr()
}
endpoint = args[0]
var dio *dio
if strings.HasPrefix(endpoint, "tls://") {
// remote network endpoint
endpointURL, err := url.Parse(endpoint)
if err != nil {
return nil, c.ArgErr()
}
dio = newIO("tls", endpointURL.Host)
d = Dnstap{io: dio}
} else if strings.HasPrefix(endpoint, "tcp://") {
// remote network endpoint
endpointURL, err := url.Parse(endpoint)
if err != nil {
return nil, c.ArgErr()
}
dio = newIO("tcp", endpointURL.Host)
d = Dnstap{io: dio}
} else {
endpoint = strings.TrimPrefix(endpoint, "unix://")
dio = newIO("unix", endpoint)
d = Dnstap{io: dio}
}
d.IncludeRawMessage = len(args) == 2 && args[1] == "full"
hostname, _ := os.Hostname()
d.Identity = []byte(hostname)
d.Version = []byte(caddy.AppName + "-" + caddy.AppVersion)
for c.NextBlock() {
switch c.Val() {
case "skipverify":
{
dio.skipVerify = true
}
case "identity":
{
if !c.NextArg() {
return nil, c.ArgErr()
}
d.Identity = []byte(c.Val())
}
case "version":
{
if !c.NextArg() {
return nil, c.ArgErr()
}
d.Version = []byte(c.Val())
}
}
}
dnstaps = append(dnstaps, &d)
}
return dnstaps, nil
}
func setup(c *caddy.Controller) error {
dnstaps, err := parseConfig(c)
if err != nil {
return plugin.Error("dnstap", err)
}
for i := range dnstaps {
dnstap := dnstaps[i]
c.OnStartup(func() error {
if err := dnstap.io.(*dio).connect(); err != nil {
log.Errorf("No connection to dnstap endpoint: %s", err)
}
return nil
})
c.OnRestart(func() error {
dnstap.io.(*dio).close()
return nil
})
c.OnFinalShutdown(func() error {
dnstap.io.(*dio).close()
return nil
})
if i == len(dnstaps)-1 {
// last dnstap plugin in block: point next to next plugin
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
dnstap.Next = next
return dnstap
})
} else {
// not last dnstap plugin in block: point next to next dnstap
nextDnstap := dnstaps[i+1]
dnsserver.GetConfig(c).AddPlugin(func(plugin.Handler) plugin.Handler {
dnstap.Next = nextDnstap
return dnstap
})
}
}
return nil
}
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