oidentd

oidentd is an RFC 1413 compliant ident daemon that runs on Linux, FreeBSD, OpenBSD, NetBSD, DragonFly BSD, and some versions of Darwin and Solaris. oidentd can handle IP/NAT masqueraded connections on many operating system kernels. oidentd has a flexible mechanism for specifying ident responses. Users can be granted permission to specify their own responses, and different responses can be sent depending on host and port pairs. oidentd features a capability-based permission system that allows system administrators fine-grained control over which functionalities may be used by each user.