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feat: add --rfc1918 flag for explicit LAN client support

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Make RFC1918 listener spawning opt-in via --rfc1918 flag instead of automatic behavior.
This allows users to explicitly control when ctrld listens on private network addresses
to receive DNS queries from LAN clients, improving security and configurability.

Refactor network interface detection to better distinguish between physical and virtual
interfaces, ensuring only real hardware interfaces are used for RFC1918 address binding.
This commit is contained in:
Cuong Manh Le
2025-09-24 17:02:16 +07:00
committed by Cuong Manh Le
parent 52cfb4c302
commit f24059885f
10 changed files with 92 additions and 3 deletions
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cmd/cli/commands_service_start.go
+1
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@@ -348,6 +348,7 @@ NOTE: running "ctrld start" without any arguments will start already installed c
startCmd.Flags().BoolVarP(&skipSelfChecks, "skip_self_checks", "", false, `Skip self checks after installing ctrld service`)
startCmd.Flags().BoolVarP(&startOnly, "start_only", "", false, "Do not install new service")
_ = startCmd.Flags().MarkHidden("start_only")
startCmd.Flags().BoolVarP(&rfc1918, "rfc1918", "", false, "Listen on RFC1918 addresses when 127.0.0.1 is the only listener")
// Start command alias
startCmdAlias := &cobra.Command{