Bump golang from 1.25-alpine to 1.26-alpine in the minor-updates group

Bumps the minor-updates group with 1 update: golang.


Updates `golang` from 1.25-alpine to 1.26-alpine

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26-alpine
  dependency-type: direct:production
  dependency-group: minor-updates
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.25-alpine AS builder
+FROM golang:1.26-alpine AS builder
 
 # Set the working directory inside the container
 WORKDIR /app

main.go

@@ -33,16 +33,15 @@ import (
 )
 
 var (
-	interfaceName    string
-	listenAddr       string
-	mtuInt           int
-	lastReadings     = make(map[string]PeerReading)
-	mu               sync.Mutex
-	wgMu             sync.Mutex // Protects WireGuard operations
-	notifyURL        string
-	proxyRelay       *relay.UDPProxyServer
-	proxySNI         *proxy.SNIProxy
-	doTrafficShaping bool
+	interfaceName string
+	listenAddr    string
+	mtuInt        int
+	lastReadings  = make(map[string]PeerReading)
+	mu            sync.Mutex
+	wgMu          sync.Mutex // Protects WireGuard operations
+	notifyURL     string
+	proxyRelay    *relay.UDPProxyServer
+	proxySNI      *proxy.SNIProxy
 )
 
 type WgConfig struct {
@@ -152,7 +151,6 @@ func main() {
 	localOverridesStr = os.Getenv("LOCAL_OVERRIDES")
 	trustedUpstreamsStr = os.Getenv("TRUSTED_UPSTREAMS")
 	proxyProtocolStr := os.Getenv("PROXY_PROTOCOL")
-	doTrafficShapingStr := os.Getenv("DO_TRAFFIC_SHAPING")
 
 	if interfaceName == "" {
 		flag.StringVar(&interfaceName, "interface", "wg0", "Name of the WireGuard interface")
@@ -224,13 +222,6 @@ func main() {
 		flag.BoolVar(&proxyProtocol, "proxy-protocol", true, "Enable PROXY protocol v1 for preserving client IP")
 	}
 
-	if doTrafficShapingStr != "" {
-		doTrafficShaping = strings.ToLower(doTrafficShapingStr) == "true"
-	}
-	if doTrafficShapingStr == "" {
-		flag.BoolVar(&doTrafficShaping, "do-traffic-shaping", false, "Whether to set up traffic shaping rules for peers (requires tc command and root privileges)")
-	}
-
 	flag.Parse()
 
 	logger.Init()
@@ -895,23 +886,17 @@ func addPeerInternal(peer Peer) error {
 		return fmt.Errorf("failed to parse public key: %v", err)
 	}
 
-	logger.Debug("Adding peer %s with AllowedIPs: %v", peer.PublicKey, peer.AllowedIPs)
-
 	// parse allowed IPs into array of net.IPNet
 	var allowedIPs []net.IPNet
 	var wgIPs []string
 	for _, ipStr := range peer.AllowedIPs {
-		logger.Debug("Parsing AllowedIP: %s", ipStr)
 		_, ipNet, err := net.ParseCIDR(ipStr)
 		if err != nil {
-			logger.Warn("Failed to parse allowed IP '%s' for peer %s: %v", ipStr, peer.PublicKey, err)
 			return fmt.Errorf("failed to parse allowed IP: %v", err)
 		}
 		allowedIPs = append(allowedIPs, *ipNet)
 		// Extract the IP address from the CIDR for relay cleanup
-		extractedIP := ipNet.IP.String()
-		wgIPs = append(wgIPs, extractedIP)
-		logger.Debug("Extracted IP %s from AllowedIP %s", extractedIP, ipStr)
+		wgIPs = append(wgIPs, ipNet.IP.String())
 	}
 
 	peerConfig := wgtypes.PeerConfig{
@@ -927,18 +912,6 @@ func addPeerInternal(peer Peer) error {
 		return fmt.Errorf("failed to add peer: %v", err)
 	}
 
-	// Setup bandwidth limiting for each peer IP
-	if doTrafficShaping {
-		logger.Debug("doTrafficShaping is true, setting up bandwidth limits for %d IPs", len(wgIPs))
-		for _, wgIP := range wgIPs {
-			if err := setupPeerBandwidthLimit(wgIP); err != nil {
-				logger.Warn("Failed to setup bandwidth limit for peer IP %s: %v", wgIP, err)
-			}
-		}
-	} else {
-		logger.Debug("doTrafficShaping is false, skipping bandwidth limit setup")
-	}
-
 	// Clear relay connections for the peer's WireGuard IPs
 	if proxyRelay != nil {
 		for _, wgIP := range wgIPs {
@@ -983,17 +956,19 @@ func removePeerInternal(publicKey string) error {
 		return fmt.Errorf("failed to parse public key: %v", err)
 	}
 
-	// Get current peer info before removing to clear relay connections and bandwidth limits
+	// Get current peer info before removing to clear relay connections
 	var wgIPs []string
-	device, err := wgClient.Device(interfaceName)
-	if err == nil {
-		for _, peer := range device.Peers {
-			if peer.PublicKey.String() == publicKey {
-				// Extract WireGuard IPs from this peer's allowed IPs
-				for _, allowedIP := range peer.AllowedIPs {
-					wgIPs = append(wgIPs, allowedIP.IP.String())
+	if proxyRelay != nil {
+		device, err := wgClient.Device(interfaceName)
+		if err == nil {
+			for _, peer := range device.Peers {
+				if peer.PublicKey.String() == publicKey {
+					// Extract WireGuard IPs from this peer's allowed IPs
+					for _, allowedIP := range peer.AllowedIPs {
+						wgIPs = append(wgIPs, allowedIP.IP.String())
+					}
+					break
 				}
-				break
 			}
 		}
 	}
@@ -1011,15 +986,6 @@ func removePeerInternal(publicKey string) error {
 		return fmt.Errorf("failed to remove peer: %v", err)
 	}
 
-	// Remove bandwidth limits for each peer IP
-	if doTrafficShaping {
-		for _, wgIP := range wgIPs {
-			if err := removePeerBandwidthLimit(wgIP); err != nil {
-				logger.Warn("Failed to remove bandwidth limit for peer IP %s: %v", wgIP, err)
-			}
-		}
-	}
-
 	// Clear relay connections for the peer's WireGuard IPs
 	if proxyRelay != nil {
 		for _, wgIP := range wgIPs {
@@ -1349,155 +1315,3 @@ func monitorMemory(limit uint64) {
 		time.Sleep(5 * time.Second)
 	}
 }
-
-// setupPeerBandwidthLimit sets up TC (Traffic Control) to limit bandwidth for a specific peer IP
-// Currently hardcoded to 20 Mbps per peer
-func setupPeerBandwidthLimit(peerIP string) error {
-	logger.Debug("setupPeerBandwidthLimit called for peer IP: %s", peerIP)
-	const bandwidthLimit = "50mbit" // 50 Mbps limit per peer
-
-	// Parse the IP to get just the IP address (strip any CIDR notation if present)
-	ip := peerIP
-	if strings.Contains(peerIP, "/") {
-		parsedIP, _, err := net.ParseCIDR(peerIP)
-		if err != nil {
-			return fmt.Errorf("failed to parse peer IP: %v", err)
-		}
-		ip = parsedIP.String()
-	}
-
-	// First, ensure we have a root qdisc on the interface (HTB - Hierarchical Token Bucket)
-	// Check if qdisc already exists
-	cmd := exec.Command("tc", "qdisc", "show", "dev", interfaceName)
-	output, err := cmd.CombinedOutput()
-	if err != nil {
-		return fmt.Errorf("failed to check qdisc: %v, output: %s", err, string(output))
-	}
-
-	// If no HTB qdisc exists, create one
-	if !strings.Contains(string(output), "htb") {
-		cmd = exec.Command("tc", "qdisc", "add", "dev", interfaceName, "root", "handle", "1:", "htb", "default", "9999")
-		if output, err := cmd.CombinedOutput(); err != nil {
-			return fmt.Errorf("failed to add root qdisc: %v, output: %s", err, string(output))
-		}
-		logger.Info("Created HTB root qdisc on %s", interfaceName)
-	}
-
-	// Generate a unique class ID based on the IP address
-	// We'll use the last octet of the IP as part of the class ID
-	ipParts := strings.Split(ip, ".")
-	if len(ipParts) != 4 {
-		return fmt.Errorf("invalid IPv4 address: %s", ip)
-	}
-	lastOctet := ipParts[3]
-	classID := fmt.Sprintf("1:%s", lastOctet)
-	logger.Debug("Generated class ID %s for peer IP %s", classID, ip)
-
-	// Create a class for this peer with bandwidth limit
-	cmd = exec.Command("tc", "class", "add", "dev", interfaceName, "parent", "1:", "classid", classID,
-		"htb", "rate", bandwidthLimit, "ceil", bandwidthLimit)
-	if output, err := cmd.CombinedOutput(); err != nil {
-		logger.Debug("tc class add failed for %s: %v, output: %s", ip, err, string(output))
-		// If class already exists, try to replace it
-		if strings.Contains(string(output), "File exists") {
-			cmd = exec.Command("tc", "class", "replace", "dev", interfaceName, "parent", "1:", "classid", classID,
-				"htb", "rate", bandwidthLimit, "ceil", bandwidthLimit)
-			if output, err := cmd.CombinedOutput(); err != nil {
-				return fmt.Errorf("failed to replace class: %v, output: %s", err, string(output))
-			}
-			logger.Debug("Successfully replaced existing class %s for peer IP %s", classID, ip)
-		} else {
-			return fmt.Errorf("failed to add class: %v, output: %s", err, string(output))
-		}
-	} else {
-		logger.Debug("Successfully added new class %s for peer IP %s", classID, ip)
-	}
-
-	// Add a filter to match traffic from this peer IP (ingress)
-	cmd = exec.Command("tc", "filter", "add", "dev", interfaceName, "protocol", "ip", "parent", "1:",
-		"prio", "1", "u32", "match", "ip", "src", ip, "flowid", classID)
-	if output, err := cmd.CombinedOutput(); err != nil {
-		// If filter fails, log but don't fail the peer addition
-		logger.Warn("Failed to add ingress filter for peer IP %s: %v, output: %s", ip, err, string(output))
-	}
-
-	// Add a filter to match traffic to this peer IP (egress)
-	cmd = exec.Command("tc", "filter", "add", "dev", interfaceName, "protocol", "ip", "parent", "1:",
-		"prio", "1", "u32", "match", "ip", "dst", ip, "flowid", classID)
-	if output, err := cmd.CombinedOutput(); err != nil {
-		// If filter fails, log but don't fail the peer addition
-		logger.Warn("Failed to add egress filter for peer IP %s: %v, output: %s", ip, err, string(output))
-	}
-
-	logger.Info("Setup bandwidth limit of %s for peer IP %s (class %s)", bandwidthLimit, ip, classID)
-	return nil
-}
-
-// removePeerBandwidthLimit removes TC rules for a specific peer IP
-func removePeerBandwidthLimit(peerIP string) error {
-	// Parse the IP to get just the IP address
-	ip := peerIP
-	if strings.Contains(peerIP, "/") {
-		parsedIP, _, err := net.ParseCIDR(peerIP)
-		if err != nil {
-			return fmt.Errorf("failed to parse peer IP: %v", err)
-		}
-		ip = parsedIP.String()
-	}
-
-	// Generate the class ID based on the IP
-	ipParts := strings.Split(ip, ".")
-	if len(ipParts) != 4 {
-		return fmt.Errorf("invalid IPv4 address: %s", ip)
-	}
-	lastOctet := ipParts[3]
-	classID := fmt.Sprintf("1:%s", lastOctet)
-
-	// Remove filters for this IP
-	// List all filters to find the ones for this class
-	cmd := exec.Command("tc", "filter", "show", "dev", interfaceName, "parent", "1:")
-	output, err := cmd.CombinedOutput()
-	if err != nil {
-		logger.Warn("Failed to list filters for peer IP %s: %v, output: %s", ip, err, string(output))
-	} else {
-		// Parse the output to find filter handles that match this classID
-		// The output format includes lines like:
-		// filter parent 1: protocol ip pref 1 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:4
-		lines := strings.Split(string(output), "\n")
-		for _, line := range lines {
-			// Look for lines containing our flowid (classID)
-			if strings.Contains(line, "flowid "+classID) && strings.Contains(line, "fh ") {
-				// Extract handle (format: fh 800::800)
-				parts := strings.Fields(line)
-				var handle string
-				for j, part := range parts {
-					if part == "fh" && j+1 < len(parts) {
-						handle = parts[j+1]
-						break
-					}
-				}
-				if handle != "" {
-					// Delete this filter using the handle
-					delCmd := exec.Command("tc", "filter", "del", "dev", interfaceName, "parent", "1:", "handle", handle, "prio", "1", "u32")
-					if delOutput, delErr := delCmd.CombinedOutput(); delErr != nil {
-						logger.Debug("Failed to delete filter handle %s for peer IP %s: %v, output: %s", handle, ip, delErr, string(delOutput))
-					} else {
-						logger.Debug("Deleted filter handle %s for peer IP %s", handle, ip)
-					}
-				}
-			}
-		}
-	}
-
-	// Remove the class
-	cmd = exec.Command("tc", "class", "del", "dev", interfaceName, "classid", classID)
-	if output, err := cmd.CombinedOutput(); err != nil {
-		// It's okay if the class doesn't exist
-		if !strings.Contains(string(output), "No such file or directory") && !strings.Contains(string(output), "Cannot find") {
-			logger.Warn("Failed to remove class for peer IP %s: %v, output: %s", ip, err, string(output))
-		}
-	}
-
-	logger.Info("Removed bandwidth limit for peer IP %s (class %s)", ip, classID)
-	return nil
-}