The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Saturday, January 02, 2021

When one IP address fails

I wrote my own gopher server several years ago. And it works fine for my own uses, But I could not load gopher://raymii.org/. I could use telnet (the gopher protocol is very easy to use by hand). I could use nc. But my client could not connect.

I finally dived into the problem and I found the issue—not all the addresses for raymii.org work! My code would call getaddrinfo(), which returns a list of addresses, and my code would just use the first one returned. Only in the case for raymii.org not all the addresses accept connections. And that's an issue that I've never encountered before.

The fix was easy—attempt to connect to each address and return when the first one connects.

Obligatory Picture

[It's the most wonderful time of the year!]

Obligatory Contact Info

Obligatory Feeds

Obligatory Links

Obligatory Miscellaneous

You have my permission to link freely to any entry here. Go ahead, I won't bite. I promise.

The dates are the permanent links to that day's entries (or entry, if there is only one entry). The titles are the permanent links to that entry only. The format for the links are simple: Start with the base link for this site: http://boston.conman.org/, then add the date you are interested in, say 2000/08/01, so that would make the final URL:

http://boston.conman.org/2000/08/01

You can also specify the entire month by leaving off the day portion. You can even select an arbitrary portion of time.

You may also note subtle shading of the links and that's intentional: the “closer” the link is (relative to the page) the “brighter” it appears. It's an experiment in using color shading to denote the distance a link is from here. If you don't notice it, don't worry; it's not all that important.

It is assumed that every brand name, slogan, corporate name, symbol, design element, et cetera mentioned in these pages is a protected and/or trademarked entity, the sole property of its owner(s), and acknowledgement of this status is implied.

Copyright © 1999-2021 by Sean Conner. All Rights Reserved.