Show originating IP address and connection time of SSH tap device

tapip

#!/bin/sh -eu

if test $# -ne 1; then
    echo Usage: $0 TAP_DEVICE >&2
    exit 2
fi

sidfile=`grep -slE "^iff:.*$1$" /proc/*/fdinfo/* | sed 's|[^/]*/[^/]*$|sessionid|'`

if test "$sidfile"; then
    loginctl show-session -p Timestamp -p RemoteHost `cat $sidfile`
else
    echo "No TAP device found: $1" >&2
    exit 1
fi