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@ -7,17 +7,19 @@ package interfaces |
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import ( |
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"fmt" |
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"log" |
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"net" |
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"net/url" |
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"os/exec" |
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"syscall" |
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"unsafe" |
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"go4.org/mem" |
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"golang.org/x/sys/windows" |
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"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg" |
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"inet.af/netaddr" |
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"tailscale.com/tsconst" |
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"tailscale.com/util/lineread" |
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) |
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const ( |
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fallbackInterfaceMetric = uint32(0) // Used if we cannot get the actual interface metric
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) |
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func init() { |
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@ -25,58 +27,76 @@ func init() { |
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getPAC = getPACWindows |
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} |
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/* |
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Parse out 10.0.0.1 from: |
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Z:\>route print -4 |
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=========================================================================== |
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Interface List |
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15...aa 15 48 ff 1c 72 ......Red Hat VirtIO Ethernet Adapter |
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5...........................Tailscale Tunnel |
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1...........................Software Loopback Interface 1 |
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=========================================================================== |
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IPv4 Route Table |
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=========================================================================== |
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Active Routes: |
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Network Destination Netmask Gateway Interface Metric |
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0.0.0.0 0.0.0.0 10.0.0.1 10.0.28.63 5 |
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10.0.0.0 255.255.0.0 On-link 10.0.28.63 261 |
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10.0.28.63 255.255.255.255 On-link 10.0.28.63 261 |
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10.0.42.0 255.255.255.0 100.103.42.106 100.103.42.106 5 |
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10.0.255.255 255.255.255.255 On-link 10.0.28.63 261 |
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34.193.248.174 255.255.255.255 100.103.42.106 100.103.42.106 5 |
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*/ |
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func likelyHomeRouterIPWindows() (ret netaddr.IP, ok bool) { |
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cmd := exec.Command("route", "print", "-4") |
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cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true} |
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stdout, err := cmd.StdoutPipe() |
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rs, err := winipcfg.GetIPForwardTable2(windows.AF_INET) |
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if err != nil { |
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log.Printf("routerIP/GetIPForwardTable2 error: %v", err) |
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return |
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} |
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if err := cmd.Start(); err != nil { |
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var ifaceMetricCache map[winipcfg.LUID]uint32 |
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getIfaceMetric := func(luid winipcfg.LUID) (metric uint32) { |
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if ifaceMetricCache == nil { |
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ifaceMetricCache = make(map[winipcfg.LUID]uint32) |
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} else if m, ok := ifaceMetricCache[luid]; ok { |
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return m |
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} |
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if iface, err := luid.IPInterface(windows.AF_INET); err == nil { |
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metric = iface.Metric |
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} else { |
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log.Printf("routerIP/luid.IPInterface error: %v", err) |
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metric = fallbackInterfaceMetric |
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} |
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ifaceMetricCache[luid] = metric |
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return |
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} |
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defer cmd.Wait() |
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var f []mem.RO |
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lineread.Reader(stdout, func(lineb []byte) error { |
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line := mem.B(lineb) |
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if !mem.Contains(line, mem.S("0.0.0.0")) { |
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return nil |
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unspec := net.IPv4(0, 0, 0, 0) |
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var best *winipcfg.MibIPforwardRow2 // best (lowest metric) found so far, or nil
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for i := range rs { |
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r := &rs[i] |
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if r.Loopback || r.DestinationPrefix.PrefixLength != 0 || !r.DestinationPrefix.Prefix.IP().Equal(unspec) { |
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// Not a default route, so skip
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continue |
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} |
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ip, ok := netaddr.FromStdIP(r.NextHop.IP()) |
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if !ok { |
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// Not a valid gateway, so skip (won't happen though)
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continue |
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} |
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if best == nil { |
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best = r |
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ret = ip |
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continue |
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} |
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f = mem.AppendFields(f[:0], line) |
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if len(f) < 3 || !f[0].EqualString("0.0.0.0") || !f[1].EqualString("0.0.0.0") { |
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return nil |
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// We can get here only if there are multiple default gateways defined (rare case),
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// in which case we need to calculate the effective metric.
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// Effective metric is sum of interface metric and route metric offset
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if ifaceMetricCache == nil { |
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// If we're here it means that previous route still isn't updated, so update it
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best.Metric += getIfaceMetric(best.InterfaceLUID) |
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} |
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ipm := f[2] |
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ip, err := netaddr.ParseIP(string(mem.Append(nil, ipm))) |
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if err == nil && isPrivateIP(ip) { |
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r.Metric += getIfaceMetric(r.InterfaceLUID) |
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if best.Metric > r.Metric || best.Metric == r.Metric && ret.Compare(ip) > 0 { |
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// Pick the route with lower metric, or lower IP if metrics are equal
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best = r |
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ret = ip |
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} |
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return nil |
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}) |
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} |
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if !ret.IsZero() && !isPrivateIP(ret) { |
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// Default route has a non-private gateway
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return netaddr.IP{}, false |
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} |
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return ret, !ret.IsZero() |
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} |
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Aleksandar Pesic
5 years ago