unable to connect to socket /var/run/lldpd.socket: Permission denied while running commandline: lldpcli -f json show neighbors

[nightwalker007]

Reproduce Steps:

1. Get the latest installation package for macos(pkg installation method) and install it, My mac os version is 11.4 Big Sur
2. run command 'lldpcli -f json show neighbors' and you will get the socket error like above

This is the ls output of the socket file "srwxrwx--- 1 _lldpd _lldpd 0 6 17 09:08 /var/run/lldpd.socket", it shows that other user can not read/write the socket and i think that is the reason

I can workround this issue by adding sudo, however, shouldn't we add current user to _lldpd group during installation??

[vincentbernat]

The way it work is that the lldpcli binary is setuid _lldpd and you need to be in the group of this binary:

 11:22 ❱ ls -ltrhA /sbin/lldpcli
-rwsr-x--- 1 _lldpd adm 111K May  1 19:53 /sbin/lldpcli

I don't remember if on MacOS, lldpcli is setuid or not. Could you check?

[staze]

This works for me using the Microsoft packaged lldpd...

https://www.microsoft.com/en-us/download/details.aspx?id=103383

Package includes post-install script to create user, add launchd plist, etc.