commit 1ffcd90796c237dbacf5030ba0b78474343a2007
Author: Faerbit <faerbit@posteo.net>
Date:   Sun Feb 4 12:58:01 2024 +0100

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fc0f50b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,93 @@
+# Created by https://www.toptal.com/developers/gitignore/api/goland+all
+# Edit at https://www.toptal.com/developers/gitignore?templates=goland+all
+
+### GoLand+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### GoLand+all Patch ###
+# Ignore everything but code style settings and run configurations
+# that are supposed to be shared within teams.
+
+.idea/*
+
+!.idea/codeStyles
+!.idea/runConfigurations
+
+# End of https://www.toptal.com/developers/gitignore/api/goland+all
+
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a478135
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,15 @@
+module dyndns-inwx-go
+
+go 1.21
+
+require (
+	github.com/libdns/inwx v0.2.0
+	github.com/libdns/libdns v0.2.1
+	github.com/sethvargo/go-envconfig v1.0.0
+)
+
+require (
+	github.com/boombuler/barcode v1.0.1 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pquerna/otp v1.4.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..0595ec8
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,22 @@
+github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/boombuler/barcode v1.0.1 h1:NDBbPmhS+EqABEs5Kg3n/5ZNjy73Pz7SIV+KCeqyXcs=
+github.com/boombuler/barcode v1.0.1/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/libdns/inwx v0.2.0 h1:yCP5EiVqmmp71dFhCD34PkUxLQixJTEZNOlO6itdNeA=
+github.com/libdns/inwx v0.2.0/go.mod h1:QNKQqPp5wVvbuMMmGFZz0UL9tZ6FaWlKTMPeUqPsJ+g=
+github.com/libdns/libdns v0.2.1 h1:Wu59T7wSHRgtA0cfxC+n1c/e+O3upJGWytknkmFEDis=
+github.com/libdns/libdns v0.2.1/go.mod h1:yQCXzk1lEZmmCPa857bnk4TsOiqYasqpyOEeSObbb40=
+github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
+github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pquerna/otp v1.4.0 h1:wZvl1TIVxKRThZIBiwOOHOGP/1+nZyWBil9Y2XNEDzg=
+github.com/pquerna/otp v1.4.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
+github.com/sethvargo/go-envconfig v1.0.0 h1:1C66wzy4QrROf5ew4KdVw942CQDa55qmlYmw9FZxZdU=
+github.com/sethvargo/go-envconfig v1.0.0/go.mod h1:Lzc75ghUn5ucmcRGIdGQ33DKJrcjk4kihFYgSTBmjIc=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..e47d869
--- /dev/null
+++ b/main.go
@@ -0,0 +1,117 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/libdns/libdns"
+	"log"
+	"net"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/libdns/inwx"
+	"github.com/sethvargo/go-envconfig"
+)
+
+type Config struct {
+	Username    string `env:"DYNDNS_USERNAME, required"`
+	Password    string `env:"DYNDNS_PASSWORD, required"`
+	Zone        string `env:"DYNDNS_ZONE, required"`
+	Record      string `env:"DYNDNS_RECORD, required"`
+	Nameservers string `env:"DYNDNS_NAMESERVERS, required"`
+}
+
+func main() {
+	ctx := context.Background()
+	var cfg Config
+	if err := envconfig.Process(ctx, &cfg); err != nil {
+		log.Fatal("Error reading config: ", err)
+	}
+
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		log.Fatal("Error getting interfaces: ", err)
+	}
+	var ownIp string
+	for _, iface := range ifaces {
+		addrs, err := iface.Addrs()
+		if err != nil {
+			log.Fatalf("Error getting addresses for %v: %s", iface, err)
+		}
+		for _, addr := range addrs {
+			if ipnet, ok := addr.(*net.IPNet); ok &&
+				ipnet.IP.To4() == nil &&
+				!ipnet.IP.IsPrivate() &&
+				!ipnet.IP.IsLinkLocalUnicast() &&
+				!ipnet.IP.IsLoopback() &&
+				ipnet.IP.IsGlobalUnicast() {
+				ownIp = ipnet.IP.String()
+			}
+		}
+	}
+	log.Print("Detected own IP: ", ownIp)
+
+	resolv := &net.Resolver{
+		PreferGo: true,
+		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{
+				Timeout: time.Duration(10) * time.Second,
+			}
+			var conn net.Conn
+			var err error
+			for _, server := range strings.Split(cfg.Nameservers, ",") {
+				conn, err = d.DialContext(ctx, network, fmt.Sprintf("%s:53", server))
+				if err == nil {
+					return conn, err
+				} else {
+					log.Printf("Error resolving with NS \"%s\"", server)
+				}
+			}
+			return conn, err
+		},
+	}
+
+	target := fmt.Sprintf("%s.%s", cfg.Record, cfg.Zone)
+	resolvIps, err := resolv.LookupHost(ctx, target)
+	if err != nil {
+		log.Fatalf("Error resolving %s: %v", target, err)
+	}
+	if len(resolvIps) != 1 {
+		log.Fatalf("Detected %d IPs for \"%s\". Don't know what to do", len(resolvIps), target)
+	}
+	resolvIp := resolvIps[0]
+	log.Printf("Resolved IP: %s", resolvIp)
+
+	forceUpdate := len(os.Args) == 2 && os.Args[1] == "--force"
+	if forceUpdate {
+		log.Println("Detected force update")
+	}
+
+	if ownIp == resolvIp && !forceUpdate {
+		log.Println("Resolved IP is equal to own IP. Nothing to do.")
+		os.Exit(0)
+	}
+
+	provider := &inwx.Provider{
+		Username: cfg.Username,
+		Password: cfg.Password,
+	}
+
+	records, err := provider.SetRecords(context.Background(), cfg.Zone, []libdns.Record{
+		{
+			Type:  "AAAA",
+			Name:  cfg.Record,
+			Value: ownIp,
+			TTL:   time.Duration(15) * time.Minute,
+		},
+	})
+
+	if err != nil {
+		log.Fatalf("Error updating DNS record \"%s\": %s", target, err)
+	}
+
+	for _, record := range records {
+		log.Printf("Set record: %v", record)
+	}
+}