Unable to access network adapter in bridged mode on Steam Deck

[t1op]

Bug Description

Cannot capture from network adapter

1. Launch xemu
2. Select network
3. Select Bridged mode
4. Select any network adapter
5. Initially I received errors about the address. Used flatseal to grant Xemu all available permissions.
6. New error: "failed to open interface '[network adapter]' for capture; [network adapter]; You don't have permission to capture on that device (socket: Operation not permitted)"

Expected Behavior

No capture error when selecting a network adapter in bridge mode.

xemu Version

0.7.71

System Information

Steam Deck
Steam OS 3.4.4

Additional Context

#Help on discord comments suggest that flatpak on Steam Deck may be missing some necessary libraries and I could not find a /runtime folder for flatpak in /var
This issue was not encountered when running Xemu on Windows 11 laptop.

[HadetTheUndying]

This is an issue with flatpak not being able to change the required permissions. Find the binary and give it the permissions outlined here in the documentation.

https://xemu.app/docs/networking/#linux

This is not an issue that can be solved by the xemu devs, this is a Linux permissions issue, those permissions are restricted for security, I believe someone in Discord walked you through where the flatpak binary is located.

[t1op]

I used this script
sudo setcap cap_net_raw,cap_net_admin=eip which xemu
replacing 'which xemu' with the file path to the binary (I found multiple instances and ran the script for each instance).
This did not resolve the issue.

The files I used the script with were:
/var/lib/flatpak/app/app.xemu.xemu/
current/
[...long numeric string...] or active
x86_64/stable/
[...long numeric string...] or active
then what I expect are relevant files under each:
export/bin/app.xemu.xemu
export/share/applications/app.xemu.xemu.desktop
files/bin/xemu
files/lib/libpcap.so.1.10.1
files/share/applications/app.xemu.xemu.desktop

[HadetTheUndying]

It appears there's some issues with Flatpak's sandboxing stopping this from working. Locally compiled Binaries don't have this issue, so I don't think this issue will be resolved any time soon without some hacky solutions. It used to work which is strange but doesn't appear to anymore and I think it has to do with some recent flatpak updates. I recommend opening an issue in the flathub repo for xemu here https://github.com/flathub/app.xemu.xemu