README.md

@@ -24,8 +24,6 @@ The program will convert IPv4-only wireguard-interfaces to IPv6. It converts and
 
 IPv6-Adresses are generated based on the IPv4-Adress.
 
-If not filtered out, then default routes (0.0.0.0/0) are handled specially and are converted to the IPv6 default route (::/0).
-
 Beware: This program needs `NET_ADMIN` privileges for setting Adresses and to access the wireguard-daemon.
 
 <br>
@@ -53,8 +51,7 @@ Variable|Description|Default
 -|-|-
 `INTERFACE`*        | Wireguard-Interface Name                  |
 `IPV6_FORMAT`       | Format to use for converting v4 to v6 <br> The CIDR-Mask gets translated using 128 - 24 - Mask <br> e.g. `10.0.100.5/16` -> `fc12::0a00:6405/96`   | `fc12::%02x%02x:%02x%02x/%d`
-`FILTER_PREFIX`     | Prefix to filter for IP-Networks          | `100.100`
+`RECHECK_INTERVAL`  | Interval in seconds to recheck AllowedIPs entries in case something changed  | 300
-`RECHECK_INTERVAL`  | Interval in go-time-format to recheck AllowedIPs entries in case something changed  | 5m
 
 *\* Required*
 
@@ -84,7 +81,7 @@ Restart=always
 RestartSec=30
 
 Environment="INTERFACE=wt0"
-Environment="RECHECK_INTERVAL=60s"
+Environment="RECHECK_INTERVAL=60"
 
 [Install]
 WantedBy=multi-user.target

build/Dockerfile

@@ -1,13 +0,0 @@
-# ---- Build ----
-FROM golang:1.19-alpine AS build
-WORKDIR /build
-# Copy sources
-ADD . .
-# Get dependencies
-RUN go get ./cmd/app
-# Compile
-RUN CGO_ENABLED=0 go build -a -o app ./cmd/app
-
-# ---- Output ----
-FROM scratch AS export-stage
-COPY --from=build /build/app .

build/build-multiarch.sh

@@ -1,9 +0,0 @@
-PLATFORM="linux/amd64,linux/arm64/v8,linux/arm/v7"
-EXTRA_ARGS="$@"
-
-docker buildx build \
-    --platform $PLATFORM \
-    -f $(dirname $0)/Dockerfile \
-    --output out \
-    $EXTRA_ARGS \
-    .

build/build-ownarch.sh

@@ -1,7 +0,0 @@
-EXTRA_ARGS="$@"
-
-docker build \
-    -f $(dirname $0)/Dockerfile \
-    --output out \
-    $EXTRA_ARGS \
-    .

cmd/app/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"strconv"
 	"time"
 
 	envChecks "git.ruekov.eu/ruakij/routingtabletowg/lib/environmentchecks"
@@ -17,17 +18,16 @@ import (
 var envRequired = []string{
 	"INTERFACE",
 }
-
 var envDefaults = map[string]string{
     "IPV6_FORMAT": "fc12::%02x%02x:%02x%02x/%d",
     "FILTER_PREFIX": "100.100",
-	"RECHECK_INTERVAL": "5m",
+    "RECHECK_INTERVAL": "300",
 }
 
 func main() {
 	// Environment-vars
 	err := envChecks.HandleRequired(envRequired)
-	if err != nil {
+	if(err != nil){
 		logger.Error.Fatal(err)
 	}
 	envChecks.HandleDefaults(envDefaults)
@@ -40,7 +40,7 @@ func main() {
     }
 
     ipv6Format := os.Getenv("IPV6_FORMAT")
-	ipv6TestStr := *convertIPv4ToIPv6(&ipv6Format, &net.IPNet{IP: net.IPv4(1, 1, 1, 1), Mask: net.CIDRMask(24, net.IPv4len)})
+    ipv6TestStr := *convertIPv4ToIPv6(&ipv6Format, &net.IPNet{IP: net.IPv4(1,1,1,1), Mask: net.CIDRMask(24, net.IPv4len)})
     _, err = netlink.ParseIPNet(ipv6TestStr)
     if err != nil {
         logger.Error.Fatalf("IPV6_FORMAT is invalid: %s", err)
@@ -49,9 +49,36 @@ func main() {
     filterPrefix := os.Getenv("FILTER_PREFIX")
 
     checkIntervalStr := os.Getenv("RECHECK_INTERVAL")
-	checkInterval, err := time.ParseDuration(checkIntervalStr)
+    checkIntervalSec, err := strconv.Atoi(checkIntervalStr)
 	if err != nil {
-		logger.Error.Fatalf("Couldn't parse RECHECK_INTERVAL '%s': %s", checkIntervalStr, err)
+		logger.Error.Fatalf("Couldn't read RECHECK_INTERVAL '%s': %s", checkIntervalStr, err)
+	}
+    checkInterval := time.Second * time.Duration(checkIntervalSec)
+
+    // Get the IPv4 address of the interface
+    addrs, err := netlink.AddrList(netInterface, netlink.FAMILY_V4)
+    if err != nil {
+        logger.Error.Fatal(err)
+    }
+    if(len(addrs) == 0){
+        logger.Error.Fatal("Interface doesnt have IPv4-Adresses")
+    }
+
+    // Add the IPv6 address to the interface
+    ipv6Str := *convertIPv4ToIPv6(&ipv6Format, addrs[0].IPNet)
+    ipv6, err := netlink.ParseAddr(ipv6Str)
+    if err != nil {
+        logger.Error.Fatal(err)
+    }
+    logger.Info.Printf("Adding converted %s -> %s to interface", addrs[0].IPNet.String(), ipv6Str)
+    err = netlink.AddrAdd(netInterface, ipv6)
+    if err != nil {
+        switch {
+        case os.IsExist(err):
+            logger.Warn.Println("Address is already set on interface")
+        default:
+            logger.Error.Fatalf("Failed to set address on interface: %v", err)
+        }
     }
 
     // Create a WireGuard client
@@ -63,44 +90,6 @@ func main() {
 
     // Loop indefinitely
     for {
-		// Get the IPv4 addresses of the interface
-		addrs, err := netlink.AddrList(netInterface, netlink.FAMILY_V4)
-		if err != nil {
-			logger.Error.Fatal(err)
-		}
-		processedCount := 0
-		filteredCount := 0
-		for _, addr := range addrs {
-			// Check filter
-			if addr.String()[:len(filterPrefix)] != filterPrefix {
-				filteredCount++
-				continue
-			}
-
-			// Add the IPv6 address to the interface
-			ipv6Str := *convertIPv4ToIPv6(&ipv6Format, addr.IPNet)
-			ipv6, err := netlink.ParseAddr(ipv6Str)
-			if err != nil {
-				logger.Warn.Printf("failed parsing converted %s -> %s : %s", addr.IPNet.String(), ipv6Str, err)
-				continue
-			}
-
-			logger.Info.Printf("Adding converted %s -> %s to interface", addr.IPNet.String(), ipv6Str)
-			err = netlink.AddrAdd(netInterface, ipv6)
-			if err != nil {
-				switch {
-				case os.IsExist(err):
-					logger.Warn.Println("Address is already set on interface")
-				default:
-					logger.Error.Fatalf("Failed to set address on interface: %v", err)
-				}
-			}
-			processedCount++
-		}
-		if processedCount != len(addrs) {
-			logger.Warn.Printf("Not all Interface-Addresses were processed. Summary: %d processed, %d filtered, %d failed", processedCount, filteredCount, len(addrs)-processedCount-filteredCount)
-		}
-
         // Get the WireGuard peers on the interface
         wgDevice, err := client.Device(iface)
         if err != nil {
@@ -112,7 +101,7 @@ func main() {
 
         for _, peer := range wgDevice.Peers {
             // Create slice for 1 expected addition
-			addAllowedIPs := make([]net.IPNet, 0, 1)
+            var addAllowedIPs = make([]net.IPNet, 0, 1)
 
             // Loop through the allowed-ips and add the ones starting with 100.100
             for _, allowedIP := range peer.AllowedIPs {
@@ -136,7 +125,7 @@ func main() {
                 }
             }
 
-			if len(addAllowedIPs) > 0 {
+            if(len(addAllowedIPs) > 0){
                 // Create peer-config
                 peerConfig := wgtypes.PeerConfig{
                     PublicKey: peer.PublicKey,
@@ -148,11 +137,11 @@ func main() {
             }
         }
 
-		if len(wgConfig.Peers) == 0 {
+        if(len(wgConfig.Peers) == 0){
             logger.Info.Println("No changes, skipping")
         } else {
             err = client.ConfigureDevice(iface, wgConfig)
-			if err != nil {
+            if(err != nil){
                 logger.Error.Fatalf("Error configuring wg-device '%s': %s", iface, err)
             }
         }
@@ -162,15 +151,7 @@ func main() {
     }
 }
 
-func convertIPv4ToIPv6(ipv6Format *string, ipv4 *net.IPNet) *string {
+func convertIPv4ToIPv6(ipv6Format *string, ipv4 *net.IPNet) (*string) {
-	// Check if this is a default route (0.0.0.0/0)
-	if ipv4.IP.Equal(net.IPv4zero) {
-		if ones, _ := ipv4.Mask.Size(); ones == 0 {
-			defaultRoute := "::/0"
-			return &defaultRoute
-		}
-	}
-
     CIDR, _ := ipv4.Mask.Size()
     // Run format
     ipv6Str := fmt.Sprintf(*ipv6Format, (*ipv4).IP[0], (*ipv4).IP[1], (*ipv4).IP[2], (*ipv4).IP[3], net.IPv6len*8-(net.IPv4len*8-CIDR))