225 lines
7.1 KiB
Perl
225 lines
7.1 KiB
Perl
#!/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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#
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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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# Versionsnummer ######################
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$ver = '0.2 beta (20050803)';
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# Modules #############################
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use Getopt::Std;
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use Net::DNS;
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use Net::SMTP;
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# Konfiguration #######################
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# Hier passende Werte einsetzen! #
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#######################################
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%config=();
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# HELO-/EHLO-Parameter - a valid hostname you own
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$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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################################################################
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# Hauptprogramm #######################
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# Konfiguration einlesen
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my %options;
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getopts('hqlrf:m:', \%options);
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if ($options{'h'} or (!$options{'f'} and !$ARGV[0])) {
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print "$0 v $ver\nUsage: $0 [-hqlr] [-m <host>] -f <file>|<address>\n";
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print "Options: -h display this notice\n";
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print " -q quiet (no output, just exit with 0/1/2/3)\n";
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print " -l extended logging\n";
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print " -r test random address to verify verification\n";
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print " -m <host> no DNS lookup, just test this host\n";
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print " -f <file> parse file (one address per line)\n";
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print " <address> mail address to check\n\n";
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exit(100);
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};
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if ($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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} else {
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die("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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};
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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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};
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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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exit($status);
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################################################################
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# Subroutinen #########################
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sub checkdns {
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# - fester Host angegeben (-m)?
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# - sonst: MX-Record ermitteln
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# - bei Verbindungsproblemen naechsten MX versuchen
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# - falls kein MX vorhanden, Fallback auf A
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# -> jeweils Adresse testen via checksmtp()
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my ($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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$status = 3;
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};
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};
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print " > Address is valid.\n" if (!$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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} 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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};
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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,$logging);
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};
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sub parse_reply {
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my($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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}
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