Running anything as root that does not need to be is a bad habit to get into, even for a "quick and dirty" program like this. Especially anything that you have set up to be available from now until you go back in and remove it (even across reboots). Change:

secshsms    stream    tcp    nowait    root    /usr/local/bin/sinet.pl
+ secshsms
[download]

to

secshsms    stream    tcp    nowait    nobody  /usr/local/bin/sinet.pl
+ secshsms
[download]

This change runs your program as the almost completely unprivileged user "nobody". (man inetd.conf)