[tunnel] --port flag for explicit destination port #78
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dilyevsky
reviewed
Oct 31, 2025
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| // Override port if specified | ||
| if overridePort != "" { | ||
| if port, err := netip.ParseAddrPort("127.0.0.1:" + overridePort); err == nil { |
Contributor
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I think you can just strconv.Atoi instead - this is confusing (why is there 127.0.0.1 in there?) Also it swallows the error
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| // Extract IPv4 address from IPv6-mapped address | ||
| dstAddr := Unmap4in6(addrFromNetstackIP(reqDetails.LocalAddress)) | ||
| dstPort := reqDetails.LocalPort | ||
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Suggested change
| // Extract IPv4 address from IPv6-mapped address | |
| dstAddr := Unmap4in6(addrFromNetstackIP(reqDetails.LocalAddress)) | |
| dstPort := reqDetails.LocalPort | |
| dstAddrPort := netip.AddrPortFrom( | |
| Unmap4in6(addrFromNetstackIP(reqDetails.LocalAddress)), | |
| reqDetails.LocalPort, | |
| ) | |
| if overridePort != 0 { | |
| logger.Debug("Overriding port", "original_port", dstAddrPort.Port, "ovveride_port", overridePort) | |
| } |
These comments are not needed
| tunnelRunCmd.Flags().BoolVar(&autoCreate, "auto", false, "Automatically create TunnelNode if it doesn't exist.") | ||
| tunnelRunCmd.Flags().StringVar(&healthAddr, "health-addr", ":8080", "Listen address for health endpoint (default: :8080).") | ||
| tunnelRunCmd.Flags().StringVar(&metricsAddr, "metrics-addr", ":8081", "Listen address for metrics endpoint (default: :8081).") | ||
| tunnelRunCmd.Flags().StringVar(&overridePort, "port", "", "Override destination port for forwarded packets (empty string preserves original port).") |
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setting this flag should force all packets to be routed to a specified port. I did not add support for overriding the destination address.
in practice, this allows users to not worry about setting a
portin an HTTPBackendRef or any other API object that references a tunnel.