sneak
ef3c373a12
Linux runs exactly as before when both bridge interfaces exist. When they do not, the lone default-route interface is monitored, and a single interface now draws a single UI pane instead of an empty second one. macOS is newly supported: a running VPN tunnel (utun) is monitored as the primary pane alongside the physical default-route interface, or the physical interface alone when no VPN is up. Detection lives in internal/netdetect: interface/route data types, pure selection logic keyed on OS name, and route parsers, all unit-tested on Linux for both platforms. Only the real route query and the per-platform TCP dial binding (source address on Linux, IP_BOUND_IF on macOS) are build-tagged. Ping argument construction is a pure, OS-keyed function. NewMonitor now takes a list of interfaces. Model: opus-4-8
37 lines
844 B
Go
37 lines
844 B
Go
//go:build darwin
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package monitor
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import (
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"net"
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"syscall"
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"golang.org/x/sys/unix"
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)
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// bindControl returns a socket control hook that pins the connection to the
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// given interface with IP_BOUND_IF. On macOS a bound source address is not
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// enough: without this the kernel still routes the packets over the VPN's
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// default route, so traffic would not leave the interface we are measuring.
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func bindControl(iface string) func(network, address string, c syscall.RawConn) error {
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ifi, err := net.InterfaceByName(iface)
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if err != nil {
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return nil
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}
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idx := ifi.Index
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return func(_, _ string, c syscall.RawConn) error {
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var setErr error
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ctrlErr := c.Control(func(fd uintptr) {
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setErr = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, idx)
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})
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if ctrlErr != nil {
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return ctrlErr
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}
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return setErr
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}
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}
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