Unable to detect certain valid network interfaces in UI

[oznu]

From homebridge/homebridge#2823 by @timdream

Describe The Bug:

I am setting a warning on tap0 being disconnected even though everything works after updating the configuration file.

Instead of running an RPi locally, I run my Homebridge in a docker container (w/ host networking) on a remote VPS, and OpenVPN back to the network. OpenVPN in tap mode is a layer 2 connection so there should be no difference on layer 3. Indeed everything is working. For the latest version yesterday I had to tweak the config with these:

"bridge" {
        "bind": [
            "tap0"
        ],
        "advertiser": "ciao"
}

but after that Homebridge works.

To Reproduce:

1. Set up a VPS
2. Set up a tap VPN connection back to home network
3. Run oznu/homebridge docker image on VPS, with host network.

Expected behavior:

1. Homebridge should work without any specific bridge.bind config.
2. tap0 should show up on the interface list in the settings UI.
3. It should not be reported as disconnected when I set it manually in the config file.

Logs:

Sorry, nothing really relevant in the homebridge log. But here is the output of docker exec -it homebridge ifconfig which shows tap0 in the list.

ifconfig log

br-1f1c3deb2144 Link encap:Ethernet  HWaddr 02:42:45:4F:9E:1C  
          inet addr:172.19.0.1  Bcast:172.19.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:45ff:fe4f:9e1c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3949 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6132 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:194927 (190.3 KiB)  TX bytes:610723 (596.4 KiB)

br-238460e0df82 Link encap:Ethernet  HWaddr 02:42:BF:27:3E:23  
          inet addr:172.26.0.1  Bcast:172.26.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:bfff:fe27:3e23/64 Scope:Link
          <omitted>

br-8e9636623717 Link encap:Ethernet  HWaddr 02:42:27:1D:BE:D2  
          inet addr:10.1.6.1  Bcast:10.1.6.255  Mask:255.255.255.0
          inet6 addr: fe80::42:27ff:fe1d:bed2/64 Scope:Link
          <omitted>

br-9c012951c8cf Link encap:Ethernet  HWaddr 02:42:48:71:4C:C9  
          inet addr:10.1.4.1  Bcast:10.1.4.255  Mask:255.255.255.0
          inet6 addr: fe80::42:48ff:fe71:4cc9/64 Scope:Link
          <omitted>

br-a5cba590e84f Link encap:Ethernet  HWaddr 02:42:CC:15:55:BB  
          inet addr:172.20.0.1  Bcast:172.20.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:ccff:fe15:55bb/64 Scope:Link
          <omitted>

br-a8aa5a8cdf01 Link encap:Ethernet  HWaddr 02:42:CC:28:1D:50  
          inet addr:172.18.0.1  Bcast:172.18.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:ccff:fe28:1d50/64 Scope:Link
          <omitted>

br-cc3aee1fae88 Link encap:Ethernet  HWaddr 02:42:13:28:C1:E1  
          inet addr:10.1.5.1  Bcast:10.1.5.255  Mask:255.255.255.0
          inet6 addr: fe80::42:13ff:fe28:c1e1/64 Scope:Link
          <omitted>

docker0   Link encap:Ethernet  HWaddr 02:42:36:DF:F7:37  
          inet addr:172.17.0.1  Bcast:172.17.255.255  Mask:255.255.0.0
          <omitted>

eth0      Link encap:Ethernet  HWaddr 04:01:6E:8E:E4:01  
          inet addr:<retracted>  Bcast:138.68.63.255  Mask:255.255.240.0
          inet6 addr: <retracted>/64 Scope:Global
          inet6 addr: fe80::601:6eff:fe8e:e401/64 Scope:Link
          <omitted>

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          <omitted>

tap0      Link encap:Ethernet  HWaddr 3E:73:20:C4:62:D5  
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::3c73:20ff:fec4:62d5/64 Scope:Link
          <omitted>

veth00f2fde Link encap:Ethernet  HWaddr 46:41:18:BA:60:C1  
          inet6 addr: fe80::4441:18ff:feba:60c1/64 Scope:Link
          <omitted>

veth3386c7a Link encap:Ethernet  HWaddr 4E:6D:85:69:2A:82  
          inet6 addr: fe80::4c6d:85ff:fe69:2a82/64 Scope:Link
          <omitted>

veth34fb2af Link encap:Ethernet  HWaddr 72:00:6A:BC:9A:6B  
          inet6 addr: fe80::7000:6aff:febc:9a6b/64 Scope:Link
          <omitted>

veth3bc738f Link encap:Ethernet  HWaddr 0A:60:30:B1:16:2F  
          inet6 addr: fe80::860:30ff:feb1:162f/64 Scope:Link
          <omitted>

veth4612441 Link encap:Ethernet  HWaddr 22:CF:31:36:81:14  
          inet6 addr: fe80::20cf:31ff:fe36:8114/64 Scope:Link
          <omitted>

veth4942623 Link encap:Ethernet  HWaddr 3E:26:A1:1A:6D:81  
          inet6 addr: fe80::3c26:a1ff:fe1a:6d81/64 Scope:Link
          <omitted>

veth73e9d17 Link encap:Ethernet  HWaddr 56:76:85:6C:66:68  
          inet6 addr: fe80::5476:85ff:fe6c:6668/64 Scope:Link
          <omitted>

veth89890f6 Link encap:Ethernet  HWaddr BE:E6:5E:9A:AF:5C  
          inet6 addr: fe80::bce6:5eff:fe9a:af5c/64 Scope:Link
          <omitted>

veth9d6425f Link encap:Ethernet  HWaddr 4A:9F:6A:28:45:D8  
          inet6 addr: fe80::489f:6aff:fe28:45d8/64 Scope:Link
          <omitted>

vethab2d723 Link encap:Ethernet  HWaddr 82:FB:50:51:8C:52  
          inet6 addr: fe80::80fb:50ff:fe51:8c52/64 Scope:Link
          <omitted>

vethc0e921b Link encap:Ethernet  HWaddr B6:AA:00:5F:7A:C9  
          inet6 addr: fe80::b4aa:ff:fe5f:7ac9/64 Scope:Link
          <omitted>

vethcfe5a80 Link encap:Ethernet  HWaddr F2:08:63:55:29:36  
          inet6 addr: fe80::f008:63ff:fe55:2936/64 Scope:Link
          <omitted>

vethd2c875e Link encap:Ethernet  HWaddr C2:7D:AB:83:26:3A  
          inet6 addr: fe80::c07d:abff:fe83:263a/64 Scope:Link
          <omitted>

vethe1ce126 Link encap:Ethernet  HWaddr 6E:6A:5A:E8:71:38  
          inet6 addr: fe80::6c6a:5aff:fee8:7138/64 Scope:Link
          <omitted>

vethf58269c Link encap:Ethernet  HWaddr 6E:6D:18:F1:C2:AF  
          inet6 addr: fe80::6c6d:18ff:fef1:c2af/64 Scope:Link
          <omitted>

Homebridge Config:

See bridge setting above.

Screenshots:

See screenshot above.

Environment:

[2/20/2021, 10:51:25 AM] [HB Supervisor] OS: Linux 5.4.0-65-generic x64
[2/20/2021, 10:51:25 AM] [HB Supervisor] Node.js v14.15.5 /usr/local/bin/node
[2/20/2021, 10:51:25 AM] [HB Supervisor] Homebridge Path: /usr/local/lib/node_modules/homebridge/bin/homebridge
[2/20/2021, 10:51:25 AM] [HB Supervisor] UI Path: /usr/local/lib/node_modules/homebridge-config-ui-x/dist/bin/standalone.js
[2/20/2021, 10:51:29 AM] [Homebridge UI] Homebridge Config UI X v4.39.0 is listening on :: port 8081
[2/20/2021, 10:51:29 AM] [HB Supervisor] Starting Homebridge with extra flags: -I -P /homebridge/node_modules
[2/20/2021, 10:51:29 AM] [HB Supervisor] Started Homebridge v1.3.0 with PID: 1344

• Node.js Version: v14.15.5
• NPM Version: v6.14.11
• Homebridge Version: v1.3.0
• Operating System: Docker/Alpine Linux (3.12.3)
• Process Supervisor: Docker

[oznu]

Hi @timdream, I've moved your issue to the Homebridge UI repo as that is where the issue is.

[oznu]

The 4.39.1-test.6 test should filter out less network interfaces. Can you check to see if your tap0 interface is now shown?

https://github.com/oznu/homebridge-config-ui-x/wiki/How-To-Test-Upcoming-Changes

[timdream]

Works for me, thanks for the quick turnaround!

[oznu]

Thanks for confirming!