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specific prior written permission. The origin of the Program must not be
misrepresented; you must not claim that you wrote the original Program.
Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original Program.
4. INDEMNIFICATION. IF YOU CONVEY A COVERED WORK AND AGREE WITH ANY RECIPIENT OF
THAT COVERED WORK THAT YOU WILL ASSUME ANY LIABILITY FOR THAT COVERED WORK,
YOU HEREBY AGREE TO INDEMNIFY, DEFEND AND HOLD HARMLESS THE OTHER LICENSORS
AND AUTHORS OF THAT COVERED WORK FOR ANY DAMAEGS, DEMANDS, CLAIMS, LOSSES,
CAUSES OF ACTION, LAWSUITS, JUDGMENTS EXPENSES (INCLUDING WITHOUT LIMITATION
REASONABLE ATTORNEYS' FEES AND EXPENSES) OR ANY OTHER LIABLITY ARISING FROM,
RELATED TO OR IN CONNECTION WITH YOUR ASSUMPTIONS OF LIABILITY.

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PKGBUILD Normal file
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# Maintainer: Fijxu <fijxu [at] nadeko [dot] net>
pkgname=simple-ddns-client-git
_pkgname=simple-ddns-client
pkgver=r1.cb947dc
pkgrel=1
pkgdesc="A simple DDNS client for Porkbun"
arch=('any')
url="https://git.nadeko.net/Fijxu/simple-ddns-client"
license=('GPL-3.0-only')
makedepends=('git' 'go')
source=("git+https://git.nadeko.net/Fijxu/simple-ddns-client.git")
sha256sums=('SKIP')
pkgver() {
cd "$srcdir/$_pkgname"
printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
}
build() {
cd "$srcdir/$_pkgname"
go build -v -trimpath ./cmd/simple-ddns-client
}
package() {
cd "$srcdir/$_pkgname"
install -Dm755 simple-ddns-client $pkgdir/usr/bin/simple-ddns-client
install -Dm644 config.json.example $pkgdir/etc/simple-ddns-client/config.json
install -Dm644 simple-ddns-client.service $pkgdir/usr/lib/systemd/system/simple-ddns-client.service
}

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README.md Normal file
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# simple-ddns-client
Simple DDNS Client for Porkbun. Other DNS Registrars or DDNS services may be
added later if I feel like it.
Made as an alternative for ddclient because it sucks and I hate it and it's the
only DDNS client that seems to support Porkbun
## Building
### Manually
```bash
git clone https://git.nadeko.net/Fijxu/simple-ddns-client.git
cd simple-ddns-client
go build ./cmd/simple-ddns-client
```
### Arch Linux
```bash
git clone https://git.nadeko.net/Fijxu/simple-ddns-client.git
cd simple-ddns-client
makepkg -si
```
---
Licensed under [GPL-3.0-only](https://spdx.org/licenses/GPL-3.0-only.html)

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/*
Copyright (C) 2025 fijxu@nadeko.net
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, version 3.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"bytes"
"context"
"encoding/json"
"io"
"log"
"net"
"net/http"
"os"
"strings"
"time"
)
type Porkbun struct {
ApiKey string `json:"apiKey"`
SecretApiKey string `json:"secretApiKey"`
Domain string `json:"domain"`
Type string `json:"type"`
// rfc1035 defines: "TTL: positive values of a signed 32 bit number."
Ttl int32 `json:"ttl"`
Data PorkbunData
}
type PorkbunData struct {
SecretApiKey *string `json:"secretapikey"`
ApiKey *string `json:"apikey"`
Ip string `json:"content"`
Ttl string `json:"ttl"`
}
type Config struct {
UpdateInterval int `json:"updateInterval"`
Provider string `json:"provider"`
DnsServer string `json:"dnsServer"`
Porkbun Porkbun `json:"porkbun"`
}
var client *http.Client
var config *Config
// https://stackoverflow.com/questions/59889882/specifying-dns-server-for-lookup-in-go
// This will only work for looking up the IP address of the domain that we
// want to update. Other requests like HTTP ones will use the system DNS
// servers.
var resolver = &net.Resolver{
PreferGo: true,
Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
d := net.Dialer{
Timeout: time.Millisecond * time.Duration(5000),
}
return d.DialContext(ctx, network, config.DnsServer)
},
}
// TODO: Use UPNP, NAT-PMP or with PCP
func getIpAddress() string {
req := doGetRequest("https://api.ipify.org")
return string(req)
}
func (p *Porkbun) updateIp() {
dnsIp, err := resolver.LookupHost(context.Background(), p.Domain)
if err != nil {
log.Print("Failed to retrieve IP address for domain " + p.Domain)
}
log.Print("Current IP of the record " + p.Domain + "is " + dnsIp[0])
p.Data.Ip = getIpAddress()
if string(dnsIp[0]) == p.Data.Ip {
log.Print("No need to update the IP address of domain " + p.Domain + ". IP is already " + p.Data.Ip)
return
}
// Porkbun uses a string for the `"ttl"` key.
p.Data.Ttl = string(p.Ttl)
p.Data.ApiKey = &p.ApiKey
p.Data.SecretApiKey = &p.SecretApiKey
domainParts := strings.Split(p.Domain, ".")
// TODO: Support 4th level FQDNs. Ex: test.us.nadeko.net
domain := domainParts[1] + "." + domainParts[2]
subDomain := domainParts[0]
data, _ := json.Marshal(&p.Data)
queryUrl := domain + "/" + p.Type + "/" + subDomain
res := doPostRequest("https://api.porkbun.com/api/json/v3/dns/editByNameType/"+queryUrl, data)
// Porkbun returns `{"status":"SUCCESS"}` if the IP address has been
// updated successfully
if strings.Contains(string(res), "SUCCESS") {
log.Print("IP Address updated to " + p.Data.Ip + " for domain " + p.Domain)
} else {
log.Print("ERROR: " + string(res))
}
}
func (p *Config) updateIp() {
switch p.Provider {
case "porkbun":
p.Porkbun.updateIp()
}
}
func loadConfig(configPath string) *Config {
var config = &Config{}
file, err := os.ReadFile(configPath)
if err != nil {
log.Fatal("Failed to parse config file: " + err.Error() + ". Exiting")
}
err = json.Unmarshal(file, config)
if err != nil {
log.Fatal("Failed to parse config file: " + err.Error() + ". Exiting")
}
return config
}
func doGetRequest(url string) []byte {
request, err := http.NewRequest("GET", url, nil)
if err != nil {
log.Fatal(err.Error())
}
res, err := client.Do(request)
if err != nil {
log.Fatal(err.Error())
}
defer res.Body.Close()
body, err := io.ReadAll(res.Body)
return body
}
func doPostRequest(url string, data []byte) []byte {
request, err := http.NewRequest("POST", url, bytes.NewBuffer(data))
if err != nil {
log.Fatal(err.Error())
}
res, err := client.Do(request)
if err != nil {
log.Fatal(err.Error())
}
defer res.Body.Close()
body, err := io.ReadAll(res.Body)
return body
}
func init() {
client = &http.Client{}
config = loadConfig("/etc/simple-ddns-client/config.json")
}
func main() {
config.updateIp()
}

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{
"interval:": 60,
"dnsServer": "1.1.1.1:53",
"provider": "porkbun",
"porkbun": {
"apiKey": "pk1_xxx",
"secretApiKey": "sk1_xxx",
"domain": "sf2.nadeko.net",
"type": "A",
"ttl": 600
}
}

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module git.nadeko.net/simple-ddns-client
go 1.23.4

19
simple-ddns-client.service Normal file
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[Unit]
Description=Simple DDNS Client
After=network.target
[Service]
ExecStart=/usr/bin/simple-ddns-client
MemoryDenyWriteExecute=true
PrivateDevices=true
PrivateTmp=true
ProtectControlGroups=true
ProtectHome=true
ProtectKernelModules=true
ProtectKernelTunables=true
ProtectSystem=strict
RestrictNamespaces=true
RestrictRealtime=true
[Install]
WantedBy=multi-user.target