tests: Extends agnhost netexec udp buffers

Currently, the UDP buffer sizes are set to 1024 bytes. Larger requests will not be
read entirely by the UDP handlers, which can lead to tests relying on this to fail.

Author: claudiubelu

test/images/agnhost/README.md

@@ -40,7 +40,7 @@ For example, let's consider the following `pod.yaml` file:
       containers:
       - args:
         - dns-suffix
-        image: gcr.io/kubernetes-e2e-test-images/agnhost:2.2
+        image: gcr.io/kubernetes-e2e-test-images/agnhost:2.7
         name: agnhost
       dnsConfig:
         nameservers:
@@ -258,14 +258,14 @@ Examples:
 
 ```console
 docker run -i \
-  gcr.io/kubernetes-e2e-test-images/agnhost:2.2 \
+  gcr.io/kubernetes-e2e-test-images/agnhost:2.7 \
   logs-generator --log-lines-total 10 --run-duration 1s
 ```
 
 ```console
 kubectl run logs-generator \
   --generator=run-pod/v1 \
-  --image=gcr.io/kubernetes-e2e-test-images/agnhost:2.2 \
+  --image=gcr.io/kubernetes-e2e-test-images/agnhost:2.7 \
   --restart=Never \
   -- logs-generator -t 10 -d 1s
 ```
@@ -392,7 +392,7 @@ Usage:
 ```console
     kubectl run test-agnhost \
       --generator=run-pod/v1 \
-      --image=gcr.io/kubernetes-e2e-test-images/agnhost:2.2 \
+      --image=gcr.io/kubernetes-e2e-test-images/agnhost:2.7 \
       --restart=Never \
       --env "POD_IP=<POD_IP>" \
       --env "NODE_IP=<NODE_IP>" \
@@ -447,7 +447,7 @@ Usage:
 ```console
     kubectl run test-agnhost \
       --generator=run-pod/v1 \
-      --image=gcr.io/kubernetes-e2e-test-images/agnhost:2.1 \
+      --image=gcr.io/kubernetes-e2e-test-images/agnhost:2.7 \
       --restart=Never \
       --env "BIND_ADDRESS=localhost" \
       --env "BIND_PORT=8080" \
@@ -534,6 +534,6 @@ The image contains `iperf`.
 
 ## Image
 
-The image can be found at `gcr.io/kubernetes-e2e-test-images/agnhost:2.2` for Linux
-containers, and `e2eteam/agnhost:2.2` for Windows containers. In the future, the same
+The image can be found at `gcr.io/kubernetes-e2e-test-images/agnhost:2.7` for Linux
+containers, and `e2eteam/agnhost:2.7` for Windows containers. In the future, the same
 repository can be used for both OSes.

test/images/agnhost/VERSION

@@ -1 +1 @@
-2.6
+2.7

test/images/agnhost/agnhost.go

@@ -44,7 +44,7 @@ import (
 )
 
 func main() {
-	rootCmd := &cobra.Command{Use: "app", Version: "2.6"}
+	rootCmd := &cobra.Command{Use: "app", Version: "2.7"}
 
 	rootCmd.AddCommand(auditproxy.CmdAuditProxy)
 	rootCmd.AddCommand(connect.CmdConnect)

test/images/agnhost/netexec/netexec.go

@@ -288,7 +288,7 @@ func dialUDP(request string, remoteAddress *net.UDPAddr) (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("udp connection write failed. err:%v", err)
 	}
-	udpResponse := make([]byte, 1024)
+	udpResponse := make([]byte, 2048)
 	Conn.SetReadDeadline(time.Now().Add(5 * time.Second))
 	count, err := Conn.Read(udpResponse)
 	if err != nil || count == 0 {
@@ -393,7 +393,7 @@ func startUDPServer(udpPort int) {
 	serverConn, err := net.ListenUDP("udp", serverAddress)
 	assertNoError(err)
 	defer serverConn.Close()
-	buf := make([]byte, 1024)
+	buf := make([]byte, 2048)
 
 	log.Printf("Started UDP server")
 	// Start responding to readiness probes.