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ipv6_linux.go
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ipv6_linux.go
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// Copyright 2023 Jigsaw Operations LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"os"
)
const disableIPv6ProcFile = "/proc/sys/net/ipv6/conf/all/disable_ipv6"
// enableIPv6 enables or disables the IPv6 support for the Linux system.
// It returns the previous setting value so the caller can restore it.
// Non-nil error means we cannot find the IPv6 setting.
func enableIPv6(enabled bool) (bool, error) {
disabledStr, err := os.ReadFile(disableIPv6ProcFile)
if err != nil {
return false, fmt.Errorf("failed to read IPv6 config: %w", err)
}
if disabledStr[0] != '0' && disabledStr[0] != '1' {
return false, fmt.Errorf("invalid IPv6 config value: %v", disabledStr)
}
prevEnabled := disabledStr[0] == '0'
if enabled {
disabledStr[0] = '0'
} else {
disabledStr[0] = '1'
}
if err := os.WriteFile(disableIPv6ProcFile, disabledStr, 0644); err != nil {
return prevEnabled, fmt.Errorf("failed to write IPv6 config: %w", err)
}
logging.Info.Printf("updated global IPv6 support: %v\n", enabled)
return prevEnabled, nil
}