CardioThink, Inc. Public Download Site
A simple perl script to bulk-email a PDF file
With the winter season upon us, it is time to send newsletters
to friends and family far and wide. This
simple perl script reads a text file that contains a list of email
addresses and attaches exactly one PDF file to an email to each.
More than one email may appear on one line in the input text file.
There are three defaults you will want to change in the script: your
return email address, the subject line to be used for each message,
and the default text body message.
Optionally, you can include a unique text message that appears in
the body of the email sent for each line in the file. If you want
to do this, you will need to pay attention to the (optional) formatting
characters in the input file.
The script writes an output file which, for each line in the input file,
reproduces the email address(es), the text body line that was used,
and the year in which email was sent. If you rerun the script with the
same input and output files, duplicate messages will not be sent so you
can add new addresses to the input file and rerun the script. This
arrangement is somewhat clumsy, but avoids use of a database that would
add even more complexity.
Unblocking your IP address in spamhaus.org
spamhaus.org is widely used by mail servers that receive mail,
including mine, to filter spam. If your mailserver's public-side IP
address is listed by spamhaus.org, some but not all of your email will
be rejected. Often, the reason for rejection (ie, "your IP is listed
with spamhaus.org) will not be given.
One common reason for listing is that your mailserver is
identifying itself as "localhost.localdomain" when it sends mail to
remote mail servers. This is taken by spamhaus.org as a sign that
your mail server may be infected, but the problem is
Download and convert sound files from the Olympus VN 480PC digital voice recorder
The Olympus VN 480PC requires a nonstandard USB driver and uses a
nonstandard audio storage format, for which the vendor supplies a driver
only for Windows. Thanks to the author of odvr, its recordings can
now easily be transferred to linux, as can those of a variety of related models. Here is how.
Configuring multiple static IP addresses with AT&T Residential U-verse service
The AT&T Residental U-verse service can be purchased with static IP addresses.
However, the technical support necessary for configuring the router that AT&T
supplies, the 2Wire 3600HGV, is hard to come by and many discussion forums document
the difficulty in doing so.
Here is a step-by-step guide
to configuring the 3600HGV to use static IP address, and also a guide to using
an inner router configured with multiple outside-facing VLANs to work around the
limitation that aliased IP addresses associated with single MAC addresses are
not recognized as separate IP addresses by the 3600HGV.
[PARTIALLY SOLVED] "I/O error" with Kodak i1210 high-speed Scanner and saned over net
A recurring problem with using saned for using USB-based scanners over the
network is an incomprehensible "I/O error" with a variety of scanners. This
issue was explored using one high-speed scanner, and a work-around is
to what may be a bug in the closed source library supplied by the vendor.
(submitted to the sane-devel maillist
Basic256 BASIC-language interpreter
The Basic256 BASIC language interpreter is
a maintained project intended to help beginning programmers learn in a fun
way. An accompanying book is available
in print. For those who like to try before they buy, a no-charge PDF of the book
is also available on that web site.
Unfortunately, binary packages may not be available for your platform, and
the source code has dependencies that can be tricky.
Here is a step-by-step guide
to installing the required packages on Fedora 15. Note the tricky modification
to the source code tree of espeak to compile it with portaudio version 19.
It's not hard, but you do have to know about it.
Also, for Fedora 15, the way to find out which packages include files of a
given name is
yum provides */filename
yum provides */pathname/filename
The wild-card character is important because otherwise it will produce a
warning to use the wild-card but will not produce otherwise-useful output.
The source code will also compile on Ubuntu 9.10. I did not keep notes, but
attention to detail will help you find the packages you need to install.
freeradius / radiusclient patch to fix PPTP "unknown attribute" problem
This section describes patches to radiusclient that fix a problem with
CHAP authentication via PPTP with freeradius and provide a program
lists the libraries and their contents as the user's radiusclient
processes them, and also makes a minor fix to allow the use of both
"$INCLUDE" and "INCLUDE" in dictionaries to include other dictionaries.
PPTP is widely used to create VPNs using the
RADIUS protocol for
accessing a back-end database of user data. An open software implementation
freeradius is widely used to
provide this backend authentication/authorization/accounting support.
In commonly used architectures, pppd is configured to use the plugin radius.o,
which in turn uses radiusclient
to communicate with the RADIUS daemon (commonly radiusd).
Since at least 2005, the technical blogs have shown a recurring problem with
apparent failure by radiusclient to understand the
RADIUS attributes 11 and 25, which
are used by Microsoft to denote the
Challenge-Handshake Authentication Protocol (CHAP)
MS-CHAP-Challenge and MS-CHAP2-Response, respectively. This lack
results in failure of CHAP authentication.
The otherwise superb
leading wiki document on the subject does not seem to help although
it does provide the missing dictionary.microsoft document
that is required.
It turns out that this particular problem arises from a
combination of three factors: the dictionary "dictionary.microsoft"
is not distributed as part of the distribution, the version
of that dictionary provided by the web page cited above has a
space at the start of each data line in the file, and the
parsing code in dict.c of radiusclient version 1.1.6 (which
compiles to libfreeradius-client.so.2.0.0) does not skip
The simple fix, of course, is to use a text
editor to delete the space at the start of each data line in
the provided file. Since there are *a lot* of copies of that
file out there, though, I have prepared and submitted a separate
patch to skip
over spaces and tabs at the start of data lines, as well as
to accept both "INCLUDE" and "$INCLUDE" as keywords since
confusion already exists and will not be resolved soon.
can be applied against both the current stable 1.1.6 release, available
here, as well as the CVS version as of 7/03/2011 available
via this link.
Please note that by default this source tree will configure itself to
install into the /usr/local tree; the usual configure options can be
used to put the component files into your favorite system directories.
Please also note that this distribution does not include
dictionary.microsoft or microsoft.merit, but both are available
You will need to insert the lines
or, after applying the patch,
at the end of the file dictionary that is read by the radiusclient.
As above, you can use the program radlistdictionary, included in the
patch above, to use the newly installed libfreeradius-client.so library to
read the dictionary/dictionaries it knows about, and to show what it is
doing so you can fix what needs to be fixed. You may need to make links
between the newly installed library and
the /usr/lib entry that your pppd uses to implement radius.o.
ecg2png: convert electrocardiograms to a Web-friendly png format
a command-line program that converts scanned electrocardiograms from a
variety of standard image formats to the PNG format. During the conversion,
it reduces the file size by discarding unnecessary colors and by reducing
the number of pixels as specified by the user. This software is released
under the GPL license in source form. It is known to compile under Linux
of the RedHat 6.0 flavor. The README and
ecg2png.lsm documents are
PGP signature key for ecg2png-0.30.tar.gz. You can retrieve our public
key from http://www.keyserver.net. Search for email@example.com.
msqldates2mysql: convert msql format dates to mysql format
msqldates2mysq-0.30.tar.gz: a very simple program that
converts the dates in the output of msqldump to the format used
by mysql. To compile, just untar it and type "make".
There are other steps required to convert data from msql to
mysql. The mysql distribution comes with a utility that
converts most msql functions to their mysql equivalents. You
still have to fix up the variable types by hand. The string
concatenation operator changes from "+" to ".". There are a
few other odds and ends:
write me if you are interested in my draft list of them.
Setting up a multihomed Linux box with an ADSL modem
How to set up a multihomed Linux box (with more than one IP
addresses) with an Alcatel ADSL modem and get all the addresses
working. There is lots of help on setting up multihomed Linux
boxes and setting up Linux with ADSL modems. But I couldn't
find anything to help me get all of the aliased IP addresses
visible from the Internet. Here is how I did it.