Complete rewrite.
- use strict; - modularize code - refactor application logic - more verbose output - test MXes in order of precedence - cope with multi-line responses - slightly change meaning of exit status - batch processing: set exit status to highest generated value Fixes #9. Fixes #10. Signed-off-by: Thomas Hochstein <thh@inter.net>
This commit is contained in:
Thomas Hochstein
parent
dd6d3ea1aa
commit
431fbb1233
487
checkmail.pl
487
checkmail.pl
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@ -1,224 +1,337 @@
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#!/usr/bin/perl -w
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#! /usr/bin/perl -W
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#
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# checkmail.pl
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##############
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# (c) 2002-2005 Thomas Hochstein <thh@inter.net>
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# checkmail Version 0.3 by Thomas Hochstein
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 2 of the License, or (at your option)
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# any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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# This script tries to verify the deliverability of (a) mail address(es).
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#
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# Copyright (c) 2002-2010 Thomas Hochstein <thh@inter.net>
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#
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# It can be redistributed and/or modified under the same terms under
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# which Perl itself is published.
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# Versionsnummer ######################
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$ver = '0.2 beta (20050803)';
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our $VERSION = "0.3";
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# Modules #############################
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################################# Configuration ################################
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# Please fill in a working configuration!
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my %config=(
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# value used for HELO/EHLO - a valid hostname you own
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helo => 'testhost.domain.example',
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# value used for MAIL FROM: - a valid address under your control
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from => 'mailtest@testhost.domain.example',
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# a syntactically valid "random" - reliably not existing - localpart
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rand => 'ZOq62fow1i'
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);
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################################### Modules ####################################
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use strict;
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use File::Basename;
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use Getopt::Std;
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use Net::DNS;
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use Net::SMTP;
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# Konfiguration #######################
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# Hier passende Werte einsetzen! #
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#######################################
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%config=();
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# HELO-/EHLO-Parameter - a valid hostname you own
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$config{'helo'} = 'testhost.domain.example';
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# MAIL FROM:-Parameter - a valid address you control
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$config{'from'} = 'mailtest@testhost.domain.example';
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# Zufaelliger Localpart fuer -r - a valid random localpart
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$config{'rand'} = 'ZOq62fow1i';
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################################# Main program #################################
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################################################################
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# Hauptprogramm #######################
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$Getopt::Std::STANDARD_HELP_VERSION = 1;
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my $myself = basename($0);
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# Konfiguration einlesen
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# read commandline options
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my %options;
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getopts('hqlrf:m:', \%options);
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getopts('Vhqlrf:m:', \%options);
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if ($options{'h'} or (!$options{'f'} and !$ARGV[0])) {
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print "$0 v $ver\nUsage: $0 [-hqlr] [-m <host>] -f <file>|<address>\n";
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print "Options: -h display this notice\n";
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print " -q quiet (no output, just exit with 0/1/2/3)\n";
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print " -l extended logging\n";
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print " -r test random address to verify verification\n";
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print " -m <host> no DNS lookup, just test this host\n";
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print " -f <file> parse file (one address per line)\n";
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print " <address> mail address to check\n\n";
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exit(100);
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# -V: display version
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if ($options{'V'}) {
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print "$myself v $VERSION\nCopyright (c) 2010 Thomas Hochstein <thh\@inter.net>\n";
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print "This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.\n";
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exit(100);
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};
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# -h: feed myself to perldoc
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if ($options{'h'}) {
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exec('perldoc', $0);
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exit(100);
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};
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# display usage information if neither -f nor an address are present
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if (!$options{'f'} and !$ARGV[0]) {
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print "Usage: $myself [-hqlr] [-m <host>] <address>|-f <file>\n";
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print "Options: -V display copyright and version\n";
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print " -h show documentation\n";
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print " -q quiet (no output, just exit with 0/1/2/3)\n";
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print " -l extended logging\n";
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print " -r test random address to verify verification\n";
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print " -m <host> no DNS lookup, just test this host\n";
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print " <address> mail address to check\n\n";
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print " -f <file> parse file (one address per line)\n";
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exit(100);
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};
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# -f: open file and read addresses to @adresses
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my @addresses;
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if ($options{'f'}) {
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if (-e $options{'f'}) {
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open FILE, "<$options{'f'}" or die("ERROR: Could not open file $options{'f'} for reading: $!");
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open FILE, "<$options{'f'}" or die("$myself ERROR: Could not open file $options{'f'} for reading: $!");
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} else {
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die("ERROR: File $options{'f'} does not exist!\n");
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die("$myself ERROR: File $options{'f'} does not exist!\n");
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};
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$log = '';
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while(<FILE>) {
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chomp;
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($status,$log) = checkdns($_,$log);
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push(@addresses,$_);
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};
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close FILE;
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# force exit(0)
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$status = 0;
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} else {
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($status,$log) = checkdns($ARGV[0]);
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# fill @adresses with single address to check
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} else {
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push(@addresses,$ARGV[0]);
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};
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# loop over each address and test it
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my (%targets,$curstat,$status,$log,$message);
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foreach (@addresses) {
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my $address = $_;
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(undef,my $domain) = splitaddress($address);
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printf(" * Testing %s ...\n",$address) if !($options{'q'});
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$log .= "\n===== BEGIN $address =====\n";
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# get list of target hosts or take host forced via -m
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if (!$options{'m'}) {
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%targets = %{gettargets($domain,\$log)};
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} else {
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$message = sprintf("Connection to %s forced by -m.\n",$options{'m'});
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$log .= $message;
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print " $message" if !($options{'q'});
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# just one target host with preference 0
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$targets{$options{'m'}} = 0;
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};
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if (%targets) {
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$curstat = checkaddress($address,\%targets,\$log);
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} else {
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$curstat = 2;
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$message = 'DNS lookup failure';
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printf(" > Address is INVALID (%s).\n",$message) if !($options{'q'});
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$log .= $message . '.';
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};
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$log .= "====== END $address ======\n";
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$status = $curstat if (!defined($status) or $curstat > $status);
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};
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print $log if ($options{'l'});
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# status 0: valid / batch processing
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# 1: invalid
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# 2: cannot verify
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# 3: temporary (?) failure
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# 1: connection failed or temporary failure
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# 2: invalid
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# 3: cannot verify
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#D print "\n-> EXIT $status\n";
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exit($status);
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################################################################
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# Subroutinen #########################
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################################## gettargets ##################################
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# get mail exchanger(s) or A record(s) for a domain
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# IN : $domain: domain to query the DNS for
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# OUT: \%targets: reference to a hash containing a list of target hosts
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sub gettargets {
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my ($domain,$logr) = @_;
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# resolver objekt
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my $resolver = Net::DNS::Resolver->new(udp_timeout => 15, tcp_timeout => 15);
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sub checkdns {
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# - fester Host angegeben (-m)?
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# - sonst: MX-Record ermitteln
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# - bei Verbindungsproblemen naechsten MX versuchen
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# - falls kein MX vorhanden, Fallback auf A
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# -> jeweils Adresse testen via checksmtp()
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my ($address,$logging) = @_;
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my ($rr,$mailhost,$status,@mx);
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my $dnsresult = 'okay';
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# (my $lp = $address) =~ s/^([^@]+)@.*/$1/;
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(my $domain = $address) =~ s/[^@]+\@(\S*)$/$1/;
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$logging .= "\n----- BEGIN $address -----\n";
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# DNS-Lookup unterdrueckt?
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if ($options{'m'}) {
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print " Connection to $options{'m'} forced by -m.\n";
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$logging .= "Connection to $options{'m'} forced by -m.\n";
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($status,$logging) = checksmtp($options{'m'},$address,$domain,$logging);
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$logging .= "----- END $address -----\n";
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return ($status,$logging);
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};
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# Resolver-Objekt
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$resolve = Net::DNS::Resolver -> new();
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$resolve->usevc(1);
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$resolve->tcp_timeout(15);
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# MX-Record feststellen
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@mx = mx($resolve,$domain) or $dnsresult = $resolve->errorstring;
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print " $domain (MX: $dnsresult)\n" if !($options{'q'});
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if (@mx) {
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WALKMX: foreach $rr (@mx) {
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$mailhost = $rr->exchange;
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print " MX: $mailhost / $address\n" if !($options{'q'});
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$logging .= "Try MX: $mailhost\n";
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($status,$logging) = checksmtp($mailhost,$address,$domain,$logging);
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last WALKMX if ($status < 3);
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};
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} elsif ($dnsresult eq 'NXDOMAIN' or $dnsresult eq 'NOERROR' or $dnsresult eq 'REFUSED') {
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# wenn kein MX-Record: A-Record feststellen
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$logging .= "MX error: $dnsresult\n";
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$dnsresult = 'okay';
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$query = $resolve->search($domain) or $dnsresult = $resolve->errorstring;
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print " $domain (A: $dnsresult)\n" if !($options{'q'});
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if ($query) {
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foreach $rr ($query->answer) {
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next unless $rr->type eq "A";
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$mailhost = $rr->address;
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print " A: $mailhost / $address\n" if !($options{'q'});
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$logging .= "Try A: $mailhost\n";
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($status,$logging) = checksmtp($mailhost,$address,$domain,$logging);
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};
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} elsif ($dnsresult eq 'NXDOMAIN' or $dnsresult eq 'NOERROR' or $dnsresult eq 'REFUSED') {
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# wenn auch kein A-Record: what a pity ...
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print " > NO DNS-RECORD (MX/A) FOUND.\n" if !($options{'q'});
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$logging .= "A error: $dnsresult\n";
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$status = 1;
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};
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};
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$logging .= "----- END $address -----\n";
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return ($status,$logging);
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};
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sub checksmtp {
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# - zu $mailhost verbinden, $adresse testen (SMTP-Dialog bis RCPT TO)
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# - ggf. (-r) testen, ob sicher ungueltige Adresse abgelehnt oder
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# alles angenommen wird
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my($mailhost,$address,$domain,$logging)=@_;
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my($smtp,$status,$valid);
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$logging .= "-------------------------\n";
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CONNECT: if ($smtp = Net::SMTP->new($mailhost,Hello => $config{'helo'},Timeout => 30)) {
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$logging .= $smtp->banner;
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$logging .= "EHLO $config{'helo'}\n";
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$logging .= parse_reply($smtp->code,$smtp->message);
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$smtp->mail($config{'from'});
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$logging .= "MAIL FROM:<$config{'from'}>\n";
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$logging .= parse_reply($smtp->code,$smtp->message);
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# wird RCPT TO akzeptiert?
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$valid = $smtp->to($address);
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$logging .= "RCPT TO:<$address>\n";
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if ($smtp->code > 0) {
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# es kam eine Antwort auf RCPT TO
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$logging .= parse_reply($smtp->code,$smtp->message);
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if ($valid) {
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# RCPT TO akzeptiert
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$status = 0;
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if ($options{'r'}) {
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# werden sicher ungueltige Adressen abgewiesen?
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$valid = $smtp->to($config{'rand'}.'@'.$domain);
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$logging .= 'RCPT TO:<'.$config{'rand'}.'@'.$domain.">\n";
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if ($smtp->code > 0) {
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# es kam eine Antwort auf RCPT TO (fuer $rand)
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$logging .= parse_reply($smtp->code,$smtp->message);
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if ($valid) {
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# ungueltiges RCPT TO akzeptiert
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print " > Sorry, cannot verify. You'll have to send a testmail ...\n" if !($options{'q'});
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$status = 2;
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};
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} else {
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# Timeout nach RCPT TO (fuer $rand)
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print " > Temporary failure.\n" if !($options{'q'});
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$logging .= "---Timeout---\n";
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$smtp->quit;
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$status = 3;
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};
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my %targets;
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# get MX record(s) as a list sorted by preference
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if (my @mxrr = mx($resolver,$domain)) {
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print_dns_result($domain,'MX',scalar(@mxrr),undef,$logr);
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foreach my $rr (@mxrr) {
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$targets{$rr->exchange} = $rr->preference;
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$$logr .= sprintf("(%d) %s\n",$rr->preference,$rr->exchange);
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};
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print " > Address is valid.\n" if (!$status and !$options{'q'});
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} else {
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# RCPT TO nicht akzeptiert
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print " > Address is INVALID.\n" if !($options{'q'});
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$status = 1;
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};
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# Verbindung beenden
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$smtp->quit;
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$logging .= "QUIT\n";
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$logging .= parse_reply($smtp->code,$smtp->message);
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# no MX record found; log and try A record(s)
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} else {
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# Timeout nach RCPT TO
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print " > Temporary failure.\n" if !($options{'q'});
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$logging .= "---Timeout---\n";
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$smtp->quit;
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$status = 3;
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print_dns_result($domain,'MX',undef,$resolver->errorstring,$logr);
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print(" Falling back to A record ...\n") if !($options{'q'});
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# get A record(s)
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if (my $query = $resolver->query($domain,'A','IN')) {
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print_dns_result($domain,'A',$query->header->ancount,undef,$logr);
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foreach my $rr ($query->answer) {
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$targets{$rr->address} = 0;
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$$logr .= sprintf("- %s\n",$rr->address);
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};
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# no A record found either; log and fail
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} else {
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print_dns_result($domain,'A',undef,$resolver->errorstring,$logr);
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printf(" %s has neither MX nor A records - mail cannot be delivered.\n",$domain) if !($options{'q'});
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};
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};
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} else {
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# Verbindung fehlgeschlagen
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print " > Temporary failure.\n" if !($options{'q'});
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$logging .= "---Timeout---\n";
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$status = 3;
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};
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return ($status,$logging);
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return \%targets;
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};
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sub parse_reply {
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my($code,$message)=@_;
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my($reply);
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$reply = $code . ' ' . $message;
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return $reply;
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################################# checkaddress #################################
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# test address for deliverability
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# IN : $address: adress to be tested
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# \%targets: reference to a hash containing a list of MX hosts
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# \$log : reference to the log (to be printed out via -l)
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# OUT: ---
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# \$log will be changed
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sub checkaddress {
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my ($address,$targetsr,$logr) = @_;
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my %targets = %{$targetsr};
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my $status;
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# walk %targets in order of preference
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foreach my $host (sort { $targets{$a} <=> $targets{$b} } keys %targets) {
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printf(" / Trying %s (%s) with %s\n",$host,$targets{$host} || 'A',$address) if !($options{'q'});
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$$logr .= sprintf("%s:\n%s\n",$host,"-" x (length($host)+1));
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$status = checksmtp($address,$host,$logr);
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last if ($status != 1);
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};
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return $status;
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};
|
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|
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################################### checksmtp ##################################
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# connect to a remote machine on port 25 and test deliverability of a mail
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# address by doing the SMTP dialog until RCPT TO stage
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# IN : $address: address to test
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# $target : target host
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# \$log : reference to the log (to be printed out via -l)
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# OUT: .........: reference to a hash containing a list of target hosts
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# \$log will be changed
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sub checksmtp {
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my ($address,$target,$logr) = @_;
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my ($status);
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# start SMTP connection
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if (my $smtp = Net::SMTP->new($target,Hello => $config{'helo'},Timeout => 30)) {
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$$logr .= $smtp->banner; # Net::SMTP doesn't seem to support multiline greetings.
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$$logr .= "EHLO $config{'helo'}\n";
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log_smtp_reply($logr,$smtp->code,$smtp->message);
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$smtp->mail($config{'from'});
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$$logr .= "MAIL FROM:<$config{'from'}>\n";
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log_smtp_reply($logr,$smtp->code,$smtp->message);
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# test address
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my ($success,$code,@message) = try_rcpt_to(\$smtp,$address,$logr);
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# connection failure?
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||||
if ($success < 0) {
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$status = connection_failed();
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# delivery attempt was successful?
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||||
} elsif ($success) {
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||||
# -r: try random address (which should be guaranteed to be invalid)
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if ($options{'r'}) {
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(undef,my $domain) = splitaddress($address);
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my ($success,$code,@message) = try_rcpt_to(\$smtp,$config{'rand'}.'@'.$domain,$logr);
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# connection failure?
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||||
if ($success < 0) {
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$status = connection_failed();
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||||
# verification impossible?
|
||||
} elsif ($success) {
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||||
$status = 3;
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||||
print " > Address verificaton impossible. You'll have to send a test mail ...\n" if !($options{'q'});
|
||||
}
|
||||
}
|
||||
# if -r is not set or status was not set to 3: valid address
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if (!defined($status)) {
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$status = 0;
|
||||
print " > Address is valid.\n" if !($options{'q'});
|
||||
};
|
||||
# delivery attempt failed?
|
||||
} else {
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||||
$status = 2;
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||||
print " > Address is INVALID:\n" if !($options{'q'});
|
||||
print ' ' . join(' ',@message) if !($options{'q'});
|
||||
}
|
||||
# terminate SMTP connection
|
||||
$smtp->quit;
|
||||
$$logr .= "QUIT\n";
|
||||
log_smtp_reply($logr,$smtp->code,$smtp->message);
|
||||
} else {
|
||||
# SMTP connection failed / timeout
|
||||
$status = connection_failed();
|
||||
$$logr .= "---Connection failure---\n";
|
||||
};
|
||||
return $status;
|
||||
}
|
||||
|
||||
################################# splitaddress #################################
|
||||
# split mail address into local and domain part
|
||||
# IN : $address: a mail address
|
||||
# OUT: $local : local part
|
||||
# $domain: domain part
|
||||
sub splitaddress {
|
||||
my($address)=@_;
|
||||
(my $lp = $address) =~ s/^([^@]+)@.*/$1/;
|
||||
(my $domain = $address) =~ s/[^@]+\@(\S*)$/$1/;
|
||||
return ($lp,$domain);
|
||||
};
|
||||
|
||||
################################ parse_dns_reply ###############################
|
||||
# parse DNS response codes and return code and description
|
||||
# IN : $response: a DNS response code
|
||||
# OUT: "$response ($desciption)"
|
||||
sub parse_dns_reply {
|
||||
my($response)=@_;
|
||||
my %dnsrespcodes = (NOERROR => 'empty response',
|
||||
NXDOMAIN => 'non-existent domain',
|
||||
SERVFAIL => 'DNS server failure',
|
||||
REFUSED => 'DNS query refused',
|
||||
FORMERR => 'format error',
|
||||
NOTIMP => 'not implemented');
|
||||
if(defined($dnsrespcodes{$response})) {
|
||||
return sprintf('%s (%s)',$response,$dnsrespcodes{$response});
|
||||
} else {
|
||||
return $response;
|
||||
};
|
||||
};
|
||||
|
||||
############################### print_dns_result ###############################
|
||||
# print and log result of DNS query
|
||||
# IN : $domain: domain the DNS was queried for
|
||||
# $type : record type (MX, A, ...)
|
||||
# $count : number of records found
|
||||
# $error : DNS response code
|
||||
# \$log : reference to the log (to be printed out via -l)
|
||||
# OUT: ---
|
||||
# \$log will be changed
|
||||
sub print_dns_result {
|
||||
my ($domain,$type,$count,$error,$logr) = @_;
|
||||
if (defined($count)) {
|
||||
printf(" %d %s record(s) found for %s\n",$count,$type,$domain) if !($options{'q'});
|
||||
$$logr .= sprintf("%s DNS record(s):\n",$type);
|
||||
} else {
|
||||
printf(" No %s records found for %s: %s\n",$type,$domain,parse_dns_reply($error)) if !($options{'q'});
|
||||
$$logr .= sprintf("No %s records found: %s\n",$type,parse_dns_reply($error));
|
||||
};
|
||||
return;
|
||||
};
|
||||
|
||||
################################## try_rcpt_to #################################
|
||||
# send RCPT TO and return replies
|
||||
# IN : \$smtp : a reference to an SMTP object
|
||||
# $recipient: a mail address
|
||||
# \$log : reference to the log (to be printed out via -l)
|
||||
# OUT: $success: true or false
|
||||
# $code : SMTP status code
|
||||
# $message: SMTP status message
|
||||
# \$log will be changed
|
||||
sub try_rcpt_to {
|
||||
my($smtpr,$recipient,$logr)=@_;
|
||||
$$logr .= sprintf("RCPT TO:<%s>\n",$recipient);
|
||||
my $success = $$smtpr->to($recipient);
|
||||
if ($$smtpr->code) {
|
||||
log_smtp_reply($logr,$$smtpr->code,$$smtpr->message);
|
||||
} else {
|
||||
$success = -1;
|
||||
$$logr .= "---Connection failure---\n";
|
||||
};
|
||||
return ($success,$$smtpr->code,$$smtpr->message);
|
||||
};
|
||||
|
||||
################################ log_smtp_reply ################################
|
||||
# log result of SMTP command
|
||||
# IN : \$log : reference to the log (to be printed out via -l)
|
||||
# $code : SMTP status code
|
||||
# @message : SMTP status message
|
||||
# OUT: ---
|
||||
# \$log will be changed
|
||||
sub log_smtp_reply {
|
||||
my($logr,$code,@message)=@_;
|
||||
$$logr .= sprintf('%s %s',$code,join('- ',@message));
|
||||
return;
|
||||
}
|
||||
|
||||
############################## connection_failed ###############################
|
||||
# print failure message and return status 1
|
||||
# OUT: 1
|
||||
sub connection_failed {
|
||||
print " > Connection failure.\n" if !($options{'q'});
|
||||
return 1;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue