kgaughan

% dig +aaonly @dns9.linuxpl.com admpassivewindows.ie ANY

; <<>> DiG 9.9.5-3ubuntu0.2-Ubuntu <<>> +aaonly @dns9.linuxpl.com admpassivewindows.ie ANY
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30496
;; flags: qr aa rd; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 3
;; WARNING: recursion requested but not available

kgaughan

# To send a email, use the 'mailx' command. This takes the email to send on
# standard input. The -s flag is used to specify your subject, and the
# recipient address is specified without any flags. Everything after '--' is
# passed on to the Mail Transport Agent (MTA, the local mailserver), and the
# '-f' flag is used to specify the sender address, while '-F' is used to
# specify the sender name.
#
# See 'man 1 mailx' for details. The Debian packages you can use for this are
# 'bsd-mailx' or 'heirloom-mailx', though both present slightly different
# command line interfaces. I'm using 'bsd-mailx' here.

kgaughan

Jul 29 11:10:13 cian knot[86688]: notice: [talideon.eu] NOTIFY, incoming, 2a01:a8:dc2:33::33@53755: unauthorized request
Jul 29 11:10:13 cian knot[86688]: notice: [talideon.eu] NOTIFY, incoming, 78.153.202.4@5042: unauthorized request
Jul 29 11:10:21 cian knot[86688]: notice: [gaughan.me] NOTIFY, incoming, 78.153.202.4@5042: unauthorized request
Jul 29 11:10:22 cian knot[86688]: notice: [gaughan.me] NOTIFY, incoming, 2a01:a8:dc2:33::33@33170: unauthorized request
Jul 29 11:10:25 cian knot[86688]: notice: [talideon.com] NOTIFY, incoming, 2a01:a8:dc2:33::33@13798: unauthorized request
Jul 29 11:10:25 cian knot[86688]: notice: [talideon.com] NOTIFY, incoming, 78.153.202.4@5042: unauthorized request
Jul 29 11:10:25 cian knot[86688]: notice: [stereochro.me] NOTIFY, incoming, 2a01:a8:dc2:33::33@12630: unauthorized request
Jul 29 11:10:25 cian knot[86688]: notice: [stereochro.me] NOTIFY, incoming, 78.153.202.4@5042: unauthorized request

kgaughan

~^(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)*[a-z](?:[a-z0-9-]*[a-z0-9])$~

kgaughan

function is_valid_local_part($local) {
    // I'm not entirely sure about this regex, but it seems to fit was RFC2822 specifies.
    return preg_match("@^[-a-z0-9!#\$%&'*+/=?^_`{|}~]+(\.[-a-z0-9!#\$%&'*+/=?^_`{|}~]+)*\$@", $local);
}

function is_well_formed_email_address($email) {
    // We ignore legacy addresses and local addresses.
    $parts = explode('@', $email, 2);
    if (count($parts) != 2) {
        return false;

kgaughan

function can_host_receive_mail($host) {
    if (checkdnsrr($host, 'MX')) {
        return true;
    }
    // We try the host itself if it exists no MX records were found, as per
    // RFC2821.
    if (checkdnsrr($host, 'A') || checkdnsrr($host, 'AAAA')) {
        $h = @fsockopen($host, 25, $errno, $errstr, 30);
        if ($h) {
            fclose($h);

kgaughan

function is_well_formed_hostname($host) {
    return preg_match('~^(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)*[a-z](?:[a-z0-9-]*[a-z0-9])$~', $host);
}

kgaughan

if (!is_well_formed_email_address($email)) {
    echo "Email address is not well-formed.\n";
} else {
    list(, $host) = explode('@', $email, 2);
    if (can_host_receive_mail($host)) {
        echo "Host $host can receive mail.\n";
    } else {
        echo "Host $host can't receive mail.\n";
    }
}

kgaughan

#!/usr/bin/env python
#
# pipedarg
# by Keith Gaughan <http://talideon.com/>
# 
# The software is hereby placed in the public domain, and the author
# disclaims ownership over it and all responsibility for any damage caused
# directly or indirectly through its use. It may be freely copied and/or
# mangled, provided that altered versions have a different name and are
# not attributed to the original author.

kgaughan

from itertools import count

def sieve():
    """
    The Sieve of Erastosthenes.

    If you wanted to speed this up, your best bets are to throw in a wheel.
    The heapq module's already written in C, so that's as fast as it's going
    to get, though if you can think of a way to avoid quite so many calls to
    heapq.heapreplace() (or prevent if from sifting the heap prematurely for