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// SPDX-License-Identifier: GPL-3.0-or-later
package dnsmasq
import (
_ "embed"
"errors"
"fmt"
"time"
"github.com/netdata/netdata/go/plugins/plugin/go.d/agent/module"
"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/confopt"
"github.com/miekg/dns"
)
//go:embed "config_schema.json"
var configSchema string
func init() {
module.Register("dnsmasq", module.Creator{
JobConfigSchema: configSchema,
Create: func() module.Module { return New() },
Config: func() any { return &Config{} },
})
}
func New() *Dnsmasq {
return &Dnsmasq{
Config: Config{
Protocol: "udp",
Address: "127.0.0.1:53",
Timeout: confopt.Duration(time.Second),
},
newDNSClient: func(network string, timeout time.Duration) dnsClient {
return &dns.Client{
Net: network,
Timeout: timeout,
}
},
}
}
type Config struct {
UpdateEvery int `yaml:"update_every,omitempty" json:"update_every"`
Address string `yaml:"address" json:"address"`
Protocol string `yaml:"protocol,omitempty" json:"protocol"`
Timeout confopt.Duration `yaml:"timeout,omitempty" json:"timeout"`
}
type (
Dnsmasq struct {
module.Base
Config `yaml:",inline" json:""`
charts *module.Charts
dnsClient dnsClient
newDNSClient func(network string, timeout time.Duration) dnsClient
}
dnsClient interface {
Exchange(msg *dns.Msg, address string) (resp *dns.Msg, rtt time.Duration, err error)
}
)
func (d *Dnsmasq) Configuration() any {
return d.Config
}
func (d *Dnsmasq) Init() error {
err := d.validateConfig()
if err != nil {
return fmt.Errorf("config validation: %v", err)
}
client, err := d.initDNSClient()
if err != nil {
return fmt.Errorf("init DNS client: %v", err)
}
d.dnsClient = client
charts, err := d.initCharts()
if err != nil {
return fmt.Errorf("init charts: %v", err)
}
d.charts = charts
return nil
}
func (d *Dnsmasq) Check() error {
mx, err := d.collect()
if err != nil {
return err
}
if len(mx) == 0 {
return errors.New("no metrics collected")
}
return nil
}
func (d *Dnsmasq) Charts() *module.Charts {
return d.charts
}
func (d *Dnsmasq) Collect() map[string]int64 {
ms, err := d.collect()
if err != nil {
d.Error(err)
}
if len(ms) == 0 {
return nil
}
return ms
}
func (d *Dnsmasq) Cleanup() {}
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