Harden scan robustness and tests

plugins/services/rmi_test.go

@@ -0,0 +1,40 @@
+//go:build plugin_rmi || !plugin_selective
+
+package services
+
+import (
+	"io"
+	"testing"
+)
+
+type chunkedRMIReader struct {
+	data      []byte
+	chunkSize int
+}
+
+func (r *chunkedRMIReader) Read(p []byte) (int, error) {
+	if len(r.data) == 0 {
+		return 0, io.EOF
+	}
+	n := len(r.data)
+	if r.chunkSize > 0 && n > r.chunkSize {
+		n = r.chunkSize
+	}
+	if n > len(p) {
+		n = len(p)
+	}
+	copy(p, r.data[:n])
+	r.data = r.data[n:]
+	return n, nil
+}
+
+func TestReadRMIEndpointHandlesChunkedReads(t *testing.T) {
+	data := []byte{0x00, 0x09}
+	data = append(data, "localhost"...)
+	data = append(data, 0x00, 0x00, 0x04, 0x4b)
+
+	got := readRMIEndpoint(&chunkedRMIReader{data: data, chunkSize: 1})
+	if got != "Java RMI endpoint=localhost:1099" {
+		t.Fatalf("readRMIEndpoint() = %q", got)
+	}
+}