Dan Harkless
Page created: October 9, 2003
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Validated HTML 5 +
CSS Last modified: June 26, 2025 |
This page contains software that was retired from my main Software page, but might feasibly still have some measurable value to someone.
| mail_all_our_NSI_DNS_customers | Useful if you're an ISP and you want to send email to all your DNS customers who're registered through Network Solutions. For instance, to inform them of the huge security risk of that company's default "MAIL-FROM" security policy. |
| whois_nameserver_users | Given a domain name registered through Network Solutions, checks what nameservers serve that domain, and then for each of those nameservers, finds up to 50 other domains also served by it. For each domain, also does an nslookup -querytype=MX domain and a traceroute www.domain. Can output results to browser or send them via email, in HTML or plain text format. Apparently Network Solutions turned off the functionality this script depended on in May 2002. |
| e |
A wrapper around gnuclient that works even when you're logged
into remote machines that don't have gnuclient installed or
when editing files on those machines that aren't NFS-mounted onto your
emacs host. |
| authorize_email |
This script, along with request_re-send,
implements a "caller-ID"-like policy for a spam-tainted email account.
When someone emails you with the magic word "re-send" in the Subject, this
script is called from your MH/nmh .maildelivery file (assuming your .forward file is set up to pass your mail
to slocal_wrapper, which passes
it to MH/nmh's slocal) to add the sender to a list of people
allowed to email you directly. Requires email_address. |
| monthly_alias |
Adds an alias of the form account_mmmyy
(e.g. dan_aug97) to the bottom of the
/etc/aliases file. Useful when posting to Usenet expecting
replies. People can email you without having to go through any anti-spam
contortions, yet you can shut off the address at the end of the month or
once you've gotten all the replies you need. |
| monthly_mh_profile_and_sig |
A companion to monthly_alias -- updates the
account_mmmyy email address in your signature file
(based on a sed template) and on the
Alternate-Mailboxes line of your .mh_profile. |
| request_re-send |
This script, along with authorize_email,
implements a "caller-ID"-like policy for a spam-tainted email account.
When someone you don't know emails you, this script will be called from
your MH/nmh .maildelivery file to
bounce their mail back to them with a Subject of "You need to re-send your
message!" The bounced mail will contain a request to forward the mail back
to you. If they do this, the mail will contain the magic word "re-send"
and authorize_email will be called. The
beauty is that spammers almost never check their incoming email,
so they won't re-send their spam and you'll never see it! [Note that in
today's world of most spam being sent from spoofed addresses, this approach
can result in "backscatter" / "blowback", thus the retirement to my "Old
Software" page. I have a mostly implemented replacement that informs the
(real) sender via passive SMTP return codes rather than separate bounce
emails, but need to get time to finish it.] |
| changein |
Calls sed to change a regexp to a replacement string in-place
in one or more files. Only useful where you don't have Perl, as perl
-e 's/pattern/replacement/g' -i -p
files (or -i.orig to save a backup) is a more
elegant solution. |
| rlogin |
A wrapper around the rlogin executable that automatically
xhosts your destination machine, makes sure
$DISPLAY is set up properly once you're there, and
de-xhosts it when you log back out (like a
cryptographically-challenged version of ssh's X11 forwarding). You must
have a special line in your .login
for full functionality. |
| rsh_status |
rsh/remsh is not as useful as one would like in a
script, since the status returned is not the status from the remote
command, but from rsh itself. rsh_status behaves like rsh but returns
the exit status from the command on the other end. |
| text.c |
Rather than using grep pattern *, use grep
pattern `text *` and grep will only look for
pattern in text files, preventing the output of
garbage characters, bells, and terminal freezes due to grepping in binary
files. (Proper modern greps like GNU grep don't suffer
from this problem.) |
| rh_advisory_update |
Takes a Red Hat Security Advisory or
Bug Fix Advisory email (as delivered to
redhat-watch-list and
Bugtraq) on
stdin and automatically downloads, verifies, and installs the
RPMs specified therein. Needs some updating to reflect Red Hat's current
email format. |
| softlink_mvprog |
I currently install software I've compiled from source using GNU Stow, but in the past I
used to do something similar manually. If I extracted a package tarball
into /usr/local/package, I'd do configure
--prefix=/usr/local/package. This scheme wasn't workable
with a few packages, including gcc, though, without using
this script in place of the system mv command. |
| wrap_setid_progs_with_envar_clearer |
Interactively finds all system set[gu]id programs on the machine and wraps
them with programs that clear one or more environment variables of your
choice then execute the real program. This was written in response to the
custom $NLSPATH and message files + format string root
exploit. |
| timecopy.c | Copies the access and modification timestamps from a source file to one or more destination files. |
| timeset.c | Sets the modification time of one or more files to the given integer (interpreted as seconds past the epoch). |
| timestamp.c | Prints out the modification time of one or more files in seconds past the epoch. If no files are specified, gives the current time in that format. |
| timestamp++.c | Increments the modification time on one or more files by 1 second. Can be useful for "uncaching" a file when you want to make a small change to it but don't want to lose the last (meaningful) modification date. |
|
Dan Harkless
Page created: October 9, 2003
|
Validated HTML 5 +
CSS Last modified: June 26, 2025 |