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//go:build linux
package bridge
import (
"bytes"
"os"
"testing"
)
func TestSetupIPForwarding(t *testing.T) {
// Read current setting and ensure the original value gets restored
procSetting := readCurrentIPForwardingSetting(t)
defer reconcileIPForwardingSetting(t, procSetting)
// Disable IP Forwarding if enabled
if bytes.Equal(procSetting, []byte("1\n")) {
writeIPForwardingSetting(t, []byte{'0', '\n'})
}
// Set IP Forwarding
if err := setupIPForwarding(true, true); err != nil {
t.Fatalf("Failed to setup IP forwarding: %v", err)
}
// Read new setting
procSetting = readCurrentIPForwardingSetting(t)
if !bytes.Equal(procSetting, []byte("1\n")) {
t.Fatal("Failed to effectively setup IP forwarding")
}
}
func readCurrentIPForwardingSetting(t *testing.T) []byte {
procSetting, err := os.ReadFile(ipv4ForwardConf)
if err != nil {
t.Fatalf("Can't execute test: Failed to read current IP forwarding setting: %v", err)
}
return procSetting
}
func writeIPForwardingSetting(t *testing.T, chars []byte) {
err := os.WriteFile(ipv4ForwardConf, chars, ipv4ForwardConfPerm)
if err != nil {
t.Fatalf("Can't execute or cleanup after test: Failed to reset IP forwarding: %v", err)
}
}
func reconcileIPForwardingSetting(t *testing.T, original []byte) {
current := readCurrentIPForwardingSetting(t)
if !bytes.Equal(original, current) {
writeIPForwardingSetting(t, original)
}
}
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