chore: release v0.26.0

internal/integrations/udp/relay_test.go

@@ -0,0 +1,77 @@
+package udp
+
+import (
+	"net"
+	"testing"
+	"time"
+)
+
+// The relay exists so a second application can be fed the same WSJT-X stream,
+// and the ONE thing it must get right is that the bytes are unchanged. The
+// relays in the field prepend an origin header ("127.0.0.1:2237|") — which is
+// why stripForwarderHeader had to be written on the receiving side — so a
+// header here would inflict on the next program the fault we had to survive.
+func TestRelayForwardsVerbatim(t *testing.T) {
+	dst, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dst.Close()
+	port := dst.LocalAddr().(*net.UDPAddr).Port
+
+	m := &Manager{outbound: []Config{{
+		ID: 1, Name: "relay", ServiceType: ServiceWSJTRelay,
+		DestinationIP: "127.0.0.1", Port: port,
+	}}}
+
+	// A packet with bytes that no parser here understands, on purpose: the relay
+	// must not care what it is carrying.
+	sent := []byte{0xad, 0xbc, 0xcb, 0xda, 0x00, 0x00, 0x00, 0x63, 0xde, 0xad, 0xbe, 0xef}
+	m.RelayInbound(sent, 2237)
+
+	buf := make([]byte, 1024)
+	_ = dst.SetReadDeadline(time.Now().Add(2 * time.Second))
+	n, _, err := dst.ReadFromUDP(buf)
+	if err != nil {
+		t.Fatalf("nothing relayed: %v", err)
+	}
+	if got := buf[:n]; string(got) != string(sent) {
+		t.Errorf("relayed % X, want % X — the bytes must go out unchanged", got, sent)
+	}
+}
+
+// A relay aimed at one of OpsLog's OWN listening ports would come straight back
+// in, be relayed again, and saturate the loopback within seconds. The row is
+// skipped instead.
+func TestRelayRefusesToFeedItself(t *testing.T) {
+	own, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer own.Close()
+	port := own.LocalAddr().(*net.UDPAddr).Port
+
+	m := &Manager{
+		inbound: map[int64]*Server{
+			7: {cfg: Config{ID: 7, Port: port, ServiceType: ServiceWSJT}},
+		},
+		outbound: []Config{{
+			ID: 1, Name: "loop", ServiceType: ServiceWSJTRelay,
+			DestinationIP: "127.0.0.1", Port: port,
+		}},
+	}
+	m.RelayInbound([]byte{1, 2, 3, 4}, 2237)
+
+	buf := make([]byte, 64)
+	_ = own.SetReadDeadline(time.Now().Add(300 * time.Millisecond))
+	if n, _, err := own.ReadFromUDP(buf); err == nil {
+		t.Fatalf("relayed %d bytes back into our own listener — that is the loop", n)
+	}
+}
+
+// No relay rows configured must cost nothing and send nothing.
+func TestRelayWithNoRowsIsSilent(t *testing.T) {
+	m := &Manager{}
+	m.RelayInbound([]byte{1, 2, 3}, 2237) // must not panic
+	m.RelayInbound(nil, 2237)
+}