For discovering where we might direct NAT-PMP/PCP/UPnP queries at in the future.main
Brad Fitzpatrick
6 years ago
parent
c3c607e78a
commit
32156330a8
@ -0,0 +1,66 @@ |
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package interfaces |
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import ( |
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"os/exec" |
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"go4.org/mem" |
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"inet.af/netaddr" |
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"tailscale.com/util/lineread" |
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) |
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func init() { |
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likelyHomeRouterIP = likelyHomeRouterIPDarwin |
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} |
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/* |
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Parse out 10.0.0.1 from: |
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$ netstat -r -n -f inet |
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Routing tables |
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Internet: |
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Destination Gateway Flags Netif Expire |
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default 10.0.0.1 UGSc en0 |
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default link#14 UCSI utun2 |
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10/16 link#4 UCS en0 ! |
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10.0.0.1/32 link#4 UCS en0 ! |
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... |
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*/ |
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func likelyHomeRouterIPDarwin() (ret netaddr.IP, ok bool) { |
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cmd := exec.Command("/usr/sbin/netstat", "-r", "-n", "-f", "inet") |
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stdout, err := cmd.StdoutPipe() |
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if err != nil { |
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return |
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} |
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if err := cmd.Start(); err != nil { |
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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("default")) { |
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return nil |
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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("default") { |
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return nil |
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} |
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ipm, flagsm := f[1], f[2] |
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if !mem.Contains(flagsm, mem.S("G")) { |
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return nil |
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} |
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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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ret = ip |
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} |
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return nil |
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}) |
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return ret, !ret.IsZero() |
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} |
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@ -0,0 +1,59 @@ |
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package interfaces |
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import ( |
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"go4.org/mem" |
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"inet.af/netaddr" |
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"tailscale.com/util/lineread" |
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) |
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func init() { |
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likelyHomeRouterIP = likelyHomeRouterIPLinux |
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} |
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/* |
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Parse 10.0.0.1 out of: |
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$ cat /proc/net/route |
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Iface Destination Gateway Flags RefCnt Use Metric Mask MTU Window IRTT |
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ens18 00000000 0100000A 0003 0 0 0 00000000 0 0 0 |
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ens18 0000000A 00000000 0001 0 0 0 0000FFFF 0 0 0 |
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*/ |
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func likelyHomeRouterIPLinux() (ret netaddr.IP, ok bool) { |
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lineNum := 0 |
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var f []mem.RO |
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lineread.File("/proc/net/route", func(line []byte) error { |
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lineNum++ |
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if lineNum == 1 { |
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// Skip header line.
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return nil |
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} |
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f = mem.AppendFields(f[:0], mem.B(line)) |
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if len(f) < 4 { |
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return nil |
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} |
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gwHex, flagsHex := f[2], f[3] |
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flags, err := mem.ParseUint(flagsHex, 16, 16) |
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if err != nil { |
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return nil // ignore error, skip line and keep going
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} |
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const RTF_UP = 0x0001 |
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const RTF_GATEWAY = 0x0002 |
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if flags&(RTF_UP|RTF_GATEWAY) != RTF_UP|RTF_GATEWAY { |
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return nil |
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} |
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ipu32, err := mem.ParseUint(gwHex, 16, 32) |
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if err != nil { |
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return nil // ignore error, skip line and keep going
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} |
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ip := netaddr.IPv4(byte(ipu32), byte(ipu32>>8), byte(ipu32>>16), byte(ipu32>>24)) |
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if isPrivateIP(ip) { |
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ret = ip |
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} |
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return nil |
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}) |
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return ret, !ret.IsZero() |
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} |
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@ -0,0 +1,71 @@ |
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package interfaces |
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import ( |
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"os/exec" |
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"go4.org/mem" |
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"inet.af/netaddr" |
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"tailscale.com/util/lineread" |
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) |
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func init() { |
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likelyHomeRouterIP = likelyHomeRouterIPWindows |
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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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stdout, err := cmd.StdoutPipe() |
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if err != nil { |
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return |
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} |
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if err := cmd.Start(); err != nil { |
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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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} |
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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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} |
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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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ret = ip |
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} |
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return nil |
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}) |
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return ret, !ret.IsZero() |
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} |
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