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add dns setting and ipv6 setting support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // 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. | ||
|
|
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| //go:build linux | ||
|
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| package main | ||
|
|
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| import ( | ||
| "fmt" | ||
| "os" | ||
| ) | ||
|
|
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| const ( | ||
| resolvConfFile = "/etc/resolv.conf" | ||
| resolvConfHeadFile = "/etc/resolv.conf.head" | ||
| resolvConfBackupFile = "/etc/resolv.outlinecli.backup" | ||
| resolvConfHeadBackupFile = "/etc/resolv.head.outlinecli.backup" | ||
| ) | ||
|
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| func setSystemDNSServer(serverHost string) error { | ||
| setting := []byte(`# Outline CLI DNS Setting | ||
| # The original file has been renamed as resolv[.head].outlinecli.backup | ||
| nameserver ` + serverHost + "\n") | ||
|
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| if err := backupAndWriteFile(resolvConfFile, resolvConfBackupFile, setting); err != nil { | ||
| return err | ||
| } | ||
| return backupAndWriteFile(resolvConfHeadFile, resolvConfHeadBackupFile, setting) | ||
| } | ||
|
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| func restoreSystemDNSServer() { | ||
| restoreFileIfExists(resolvConfBackupFile, resolvConfFile) | ||
| restoreFileIfExists(resolvConfHeadBackupFile, resolvConfHeadFile) | ||
| } | ||
|
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| func backupAndWriteFile(original, backup string, data []byte) error { | ||
| if err := os.Rename(original, backup); err != nil { | ||
| return fmt.Errorf("failed to backup DNS config file '%s' to '%s': %w", original, backup, err) | ||
| } | ||
| if err := os.WriteFile(original, data, 0644); err != nil { | ||
| return fmt.Errorf("failed to write DNS config file '%s': %w", original, err) | ||
| } | ||
| return nil | ||
| } | ||
|
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| func restoreFileIfExists(backup, original string) { | ||
| if _, err := os.Stat(backup); err != nil { | ||
| fmt.Printf("[warn] failed to read DNS config backup '%s': %v\n", backup, err) | ||
| return | ||
| } | ||
| if err := os.Rename(backup, original); err != nil { | ||
| fmt.Printf("[error] failed to restore DNS config from backup '%s' to '%s': %v\n", backup, original, err) | ||
| return | ||
| } | ||
| fmt.Printf("[info] DNS config restored from '%s' to '%s'\n", backup, original) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // 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. | ||
|
|
||
| //go:build linux | ||
|
|
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| package main | ||
|
|
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| import ( | ||
| "fmt" | ||
| "os" | ||
| ) | ||
|
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| const disableIPv6ProcFile = "/proc/sys/net/ipv6/conf/all/disable_ipv6" | ||
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| // 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) | ||
| } | ||
|
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| prevEnabled := disabledStr[0] == '0' | ||
|
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| 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) | ||
| } | ||
|
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| fmt.Printf("[info] global IPv6 enabled: %v\n", enabled) | ||
| return prevEnabled, nil | ||
| } |
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