| 1 | #!/usr/bin/perl -w |
| 2 | # |
| 3 | # checkmail.pl |
| 4 | ############## |
| 5 | |
| 6 | # (c) 2002-2005 Thomas Hochstein <thh@inter.net> |
| 7 | # |
| 8 | # This program is free software; you can redistribute it and/or modify it under |
| 9 | # the terms of the GNU General Public License as published by the Free |
| 10 | # Software Foundation; either version 2 of the License, or (at your option) |
| 11 | # any later version. |
| 12 | # This program is distributed in the hope that it will be useful, but WITHOUT |
| 13 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | # more details. |
| 16 | |
| 17 | # Versionsnummer ###################### |
| 18 | $ver = '0.2 beta (20050803)'; |
| 19 | |
| 20 | # Modules ############################# |
| 21 | use Getopt::Std; |
| 22 | use Net::DNS; |
| 23 | use Net::SMTP; |
| 24 | |
| 25 | # Konfiguration ####################### |
| 26 | # Hier passende Werte einsetzen! # |
| 27 | ####################################### |
| 28 | %config=(); |
| 29 | # HELO-/EHLO-Parameter - a valid hostname you own |
| 30 | $config{'helo'} = 'testhost.domain.example'; |
| 31 | # MAIL FROM:-Parameter - a valid address you control |
| 32 | $config{'from'} = 'mailtest@testhost.domain.example'; |
| 33 | # Zufaelliger Localpart fuer -r - a valid random localpart |
| 34 | $config{'rand'} = 'ZOq62fow1i'; |
| 35 | |
| 36 | ################################################################ |
| 37 | # Hauptprogramm ####################### |
| 38 | |
| 39 | # Konfiguration einlesen |
| 40 | my %options; |
| 41 | getopts('hqlrf:m:', \%options); |
| 42 | |
| 43 | if ($options{'h'} or (!$options{'f'} and !$ARGV[0])) { |
| 44 | print "$0 v $ver\nUsage: $0 [-hqlr] [-m <host>] -f <file>|<address>\n"; |
| 45 | print "Options: -h display this notice\n"; |
| 46 | print " -q quiet (no output, just exit with 0/1/2/3)\n"; |
| 47 | print " -l extended logging\n"; |
| 48 | print " -r test random address to verify verification\n"; |
| 49 | print " -m <host> no DNS lookup, just test this host\n"; |
| 50 | print " -f <file> parse file (one address per line)\n"; |
| 51 | print " <address> mail address to check\n\n"; |
| 52 | exit(100); |
| 53 | }; |
| 54 | |
| 55 | if ($options{'f'}) { |
| 56 | if (-e $options{'f'}) { |
| 57 | open FILE, "<$options{'f'}" or die("ERROR: Could not open file $options{'f'} for reading: $!"); |
| 58 | } else { |
| 59 | die("ERROR: File $options{'f'} does not exist!\n"); |
| 60 | }; |
| 61 | $log = ''; |
| 62 | while(<FILE>) { |
| 63 | chomp; |
| 64 | ($status,$log) = checkdns($_,$log); |
| 65 | }; |
| 66 | close FILE; |
| 67 | # force exit(0) |
| 68 | $status = 0; |
| 69 | } else { |
| 70 | ($status,$log) = checkdns($ARGV[0]); |
| 71 | }; |
| 72 | |
| 73 | print $log if ($options{'l'}); |
| 74 | |
| 75 | # status 0: valid / batch processing |
| 76 | # 1: invalid |
| 77 | # 2: cannot verify |
| 78 | # 3: temporary (?) failure |
| 79 | exit($status); |
| 80 | |
| 81 | ################################################################ |
| 82 | # Subroutinen ######################### |
| 83 | |
| 84 | sub checkdns { |
| 85 | # - fester Host angegeben (-m)? |
| 86 | # - sonst: MX-Record ermitteln |
| 87 | # - bei Verbindungsproblemen naechsten MX versuchen |
| 88 | # - falls kein MX vorhanden, Fallback auf A |
| 89 | # -> jeweils Adresse testen via checksmtp() |
| 90 | my ($address,$logging) = @_; |
| 91 | my ($rr,$mailhost,$status,@mx); |
| 92 | my $dnsresult = 'okay'; |
| 93 | # (my $lp = $address) =~ s/^([^@]+)@.*/$1/; |
| 94 | (my $domain = $address) =~ s/[^@]+\@(\S*)$/$1/; |
| 95 | |
| 96 | $logging .= "\n----- BEGIN $address -----\n"; |
| 97 | |
| 98 | # DNS-Lookup unterdrueckt? |
| 99 | if ($options{'m'}) { |
| 100 | print " Connection to $options{'m'} forced by -m.\n"; |
| 101 | $logging .= "Connection to $options{'m'} forced by -m.\n"; |
| 102 | ($status,$logging) = checksmtp($options{'m'},$address,$domain,$logging); |
| 103 | $logging .= "----- END $address -----\n"; |
| 104 | return ($status,$logging); |
| 105 | }; |
| 106 | |
| 107 | # Resolver-Objekt |
| 108 | $resolve = Net::DNS::Resolver -> new(); |
| 109 | $resolve->usevc(1); |
| 110 | $resolve->tcp_timeout(15); |
| 111 | |
| 112 | # MX-Record feststellen |
| 113 | @mx = mx($resolve,$domain) or $dnsresult = $resolve->errorstring; |
| 114 | print " $domain (MX: $dnsresult)\n" if !($options{'q'}); |
| 115 | |
| 116 | if (@mx) { |
| 117 | WALKMX: foreach $rr (@mx) { |
| 118 | $mailhost = $rr->exchange; |
| 119 | print " MX: $mailhost / $address\n" if !($options{'q'}); |
| 120 | $logging .= "Try MX: $mailhost\n"; |
| 121 | ($status,$logging) = checksmtp($mailhost,$address,$domain,$logging); |
| 122 | last WALKMX if ($status < 3); |
| 123 | }; |
| 124 | } elsif ($dnsresult eq 'NXDOMAIN' or $dnsresult eq 'NOERROR' or $dnsresult eq 'REFUSED') { |
| 125 | # wenn kein MX-Record: A-Record feststellen |
| 126 | $logging .= "MX error: $dnsresult\n"; |
| 127 | $dnsresult = 'okay'; |
| 128 | $query = $resolve->search($domain) or $dnsresult = $resolve->errorstring; |
| 129 | print " $domain (A: $dnsresult)\n" if !($options{'q'}); |
| 130 | if ($query) { |
| 131 | foreach $rr ($query->answer) { |
| 132 | next unless $rr->type eq "A"; |
| 133 | $mailhost = $rr->address; |
| 134 | print " A: $mailhost / $address\n" if !($options{'q'}); |
| 135 | $logging .= "Try A: $mailhost\n"; |
| 136 | ($status,$logging) = checksmtp($mailhost,$address,$domain,$logging); |
| 137 | }; |
| 138 | } elsif ($dnsresult eq 'NXDOMAIN' or $dnsresult eq 'NOERROR' or $dnsresult eq 'REFUSED') { |
| 139 | # wenn auch kein A-Record: what a pity ... |
| 140 | print " > NO DNS-RECORD (MX/A) FOUND.\n" if !($options{'q'}); |
| 141 | $logging .= "A error: $dnsresult\n"; |
| 142 | $status = 1; |
| 143 | }; |
| 144 | }; |
| 145 | $logging .= "----- END $address -----\n"; |
| 146 | return ($status,$logging); |
| 147 | }; |
| 148 | |
| 149 | sub checksmtp { |
| 150 | # - zu $mailhost verbinden, $adresse testen (SMTP-Dialog bis RCPT TO) |
| 151 | # - ggf. (-r) testen, ob sicher ungueltige Adresse abgelehnt oder |
| 152 | # alles angenommen wird |
| 153 | my($mailhost,$address,$domain,$logging)=@_; |
| 154 | my($smtp,$status,$valid); |
| 155 | $logging .= "-------------------------\n"; |
| 156 | CONNECT: if ($smtp = Net::SMTP->new($mailhost,Hello => $config{'helo'},Timeout => 30)) { |
| 157 | $logging .= $smtp->banner; |
| 158 | $logging .= "EHLO $config{'helo'}\n"; |
| 159 | $logging .= parse_reply($smtp->code,$smtp->message); |
| 160 | $smtp->mail($config{'from'}); |
| 161 | $logging .= "MAIL FROM:<$config{'from'}>\n"; |
| 162 | $logging .= parse_reply($smtp->code,$smtp->message); |
| 163 | # wird RCPT TO akzeptiert? |
| 164 | $valid = $smtp->to($address); |
| 165 | $logging .= "RCPT TO:<$address>\n"; |
| 166 | if ($smtp->code > 0) { |
| 167 | # es kam eine Antwort auf RCPT TO |
| 168 | $logging .= parse_reply($smtp->code,$smtp->message); |
| 169 | if ($valid) { |
| 170 | # RCPT TO akzeptiert |
| 171 | $status = 0; |
| 172 | if ($options{'r'}) { |
| 173 | # werden sicher ungueltige Adressen abgewiesen? |
| 174 | $valid = $smtp->to($config{'rand'}.'@'.$domain); |
| 175 | $logging .= 'RCPT TO:<'.$config{'rand'}.'@'.$domain.">\n"; |
| 176 | if ($smtp->code > 0) { |
| 177 | # es kam eine Antwort auf RCPT TO (fuer $rand) |
| 178 | $logging .= parse_reply($smtp->code,$smtp->message); |
| 179 | if ($valid) { |
| 180 | # ungueltiges RCPT TO akzeptiert |
| 181 | print " > Sorry, cannot verify. You'll have to send a testmail ...\n" if !($options{'q'}); |
| 182 | $status = 2; |
| 183 | }; |
| 184 | } else { |
| 185 | # Timeout nach RCPT TO (fuer $rand) |
| 186 | print " > Temporary failure.\n" if !($options{'q'}); |
| 187 | $logging .= "---Timeout---\n"; |
| 188 | $smtp->quit; |
| 189 | $status = 3; |
| 190 | }; |
| 191 | }; |
| 192 | print " > Address is valid.\n" if (!$status and !$options{'q'}); |
| 193 | } else { |
| 194 | # RCPT TO nicht akzeptiert |
| 195 | print " > Address is INVALID.\n" if !($options{'q'}); |
| 196 | $status = 1; |
| 197 | }; |
| 198 | # Verbindung beenden |
| 199 | $smtp->quit; |
| 200 | $logging .= "QUIT\n"; |
| 201 | $logging .= parse_reply($smtp->code,$smtp->message); |
| 202 | } else { |
| 203 | # Timeout nach RCPT TO |
| 204 | print " > Temporary failure.\n" if !($options{'q'}); |
| 205 | $logging .= "---Timeout---\n"; |
| 206 | $smtp->quit; |
| 207 | $status = 3; |
| 208 | }; |
| 209 | } else { |
| 210 | # Verbindung fehlgeschlagen |
| 211 | print " > Temporary failure.\n" if !($options{'q'}); |
| 212 | $logging .= "---Timeout---\n"; |
| 213 | $status = 3; |
| 214 | }; |
| 215 | return ($status,$logging); |
| 216 | }; |
| 217 | |
| 218 | sub parse_reply { |
| 219 | my($code,$message)=@_; |
| 220 | my($reply); |
| 221 | $reply = $code . ' ' . $message; |
| 222 | return $reply; |
| 223 | } |
| 224 | |