Add backends and simulated TPM device

Signed-off-by: Ettore Di Giacinto <edigiacinto@suse.com>

backend/backend_suite_test.go

@@ -0,0 +1,13 @@
+package backend_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+func TestBackend(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Backend Suite")
+}

backend/fake.go

@@ -0,0 +1,17 @@
+package backend
+
+import (
+	"io"
+)
+
+type FakeTPM struct {
+	io.ReadWriteCloser
+}
+
+var fixedLog = []byte{0x0, 0x0, 0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+	0x0, 0x0, 0x21, 0x0, 0x0, 0x0, 0x53, 0x70, 0x65, 0x63, 0x20, 0x49, 0x44,
+	0x20, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x30, 0x33, 0x0, 0x0, 0x0, 0x0, 0x0,
+	0x0, 0x2, 0x0, 0x2, 0x1, 0x0, 0x0, 0x0, 0xb, 0x0, 0x20, 0x0, 0x0}
+
+func (*FakeTPM) MeasurementLog() ([]byte, error) { return fixedLog, nil }

backend/socket.go

@@ -0,0 +1,13 @@
+package backend
+
+import "net"
+
+func Socket(f string) (*FakeTPM, error) {
+	conn, err := net.Dial("unix", f)
+	if err != nil {
+		return nil, err
+	}
+	return &FakeTPM{
+		ReadWriteCloser: conn,
+	}, nil
+}

backend/socket_test.go

@@ -0,0 +1,29 @@
+package backend_test
+
+import (
+	"os"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	. "github.com/rancher-sandbox/go-tpm/backend"
+)
+
+var _ = Describe("SWTPM", func() {
+	socket := os.Getenv("SWTPM_SOCKET")
+	Context("opening socket connection", func() {
+		It("fails on invalid files", func() {
+
+			_, err := Socket("foobar")
+			Expect(err).To(HaveOccurred())
+
+		})
+
+		It("dials in just fine", func() {
+			if socket == "" {
+				Skip("No socket file specified")
+			}
+			_, err := Socket(socket)
+			Expect(err).ToNot(HaveOccurred())
+		})
+	})
+})