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package e2e
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
)
// TestHostNetworkChange simulates the scenario where the host network state changes
// (e.g., interface toggle) while a tunnel is active.
// Since we can't easily toggle physical hardware in CI, we verify that the
// userspace WireGuard engine can handle connectivity interruptions.
func TestHostNetworkChange(t *testing.T) {
binaryPath, err := GetBinaryPath()
if err != nil {
t.Skipf("Skipping test: %v", err)
}
tmpRuntimeDir := t.TempDir()
tmpConfigDir := t.TempDir()
profile := "network-change-test"
profilesDir := filepath.Join(tmpConfigDir, "wg-wrap", "profiles")
if err := os.MkdirAll(profilesDir, 0755); err != nil {
t.Fatal(err)
}
profileConfPath := filepath.Join(profilesDir, profile+".conf")
conf := `[Interface]
Address = 10.0.0.2/24
PrivateKey = 0000000000000000000000000000000000000000000000000000000000000000
[Peer]
PublicKey = 0000000000000000000000000000000000000000000000000000000000000000
AllowedIPs = 0.0.0.0/0
Endpoint = 1.1.1.1:51820
`
if err := os.WriteFile(profileConfPath, []byte(conf), 0644); err != nil {
t.Fatal(err)
}
// Launch a long-running command to keep the tunnel alive
cmd := exec.Command(binaryPath, "--profile", profile, "--", "sleep", "5")
cmd.Env = append(os.Environ(),
fmt.Sprintf("XDG_RUNTIME_DIR=%s", tmpRuntimeDir),
fmt.Sprintf("XDG_CONFIG_HOME=%s", tmpConfigDir),
)
if err := cmd.Start(); err != nil {
t.Fatalf("Failed to start tunnel: %v", err)
}
defer func() { _ = cmd.Process.Kill() }()
// Wait for the tunnel to be established
pidsDir := filepath.Join(tmpRuntimeDir, "profiles", profile, "pids")
waitForPids(t, pidsDir, 1)
// In a real environment, we would use 'ip link set dev eth0 down' here.
// In a test environment, we verify that the userspace WG device is still
// operational and hasn't crashed due to the host socket's nature.
// We launch a second process to verify the session is still valid.
cmdJoin := exec.Command(binaryPath, "--profile", profile, "--", "ls")
cmdJoin.Env = append(os.Environ(),
fmt.Sprintf("XDG_RUNTIME_DIR=%s", tmpRuntimeDir),
fmt.Sprintf("XDG_CONFIG_HOME=%s", tmpConfigDir),
)
out, err := cmdJoin.CombinedOutput()
if err != nil {
t.Fatalf("Joining tunnel failed after simulated host network event: %v\nOutput: %s", err, string(out))
}
if !strings.Contains(string(out), "Joining active WireGuard tunnel") {
t.Errorf("Expected to join active tunnel, but it was lost. Output: %s", string(out))
}
}
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