Identify program that connects to a Unix Domain Socket

Question

I have a program that is listening to a Unix Domain Socket.

When a client connects to the socket I\'d like to find out which program connected and then decide if I allow

Answer 1

Perhaps getpeername or getsockname could help. and I think that the permission of your unix socket are useful (not sure of that). And you might read the link inside /proc/self/fd/12 if your accept-ed socket is 12.

EDIT

using ancillary data for credentials and sendmsg is much better, as suggested by cnicutar below.