Allow setting an empty envelope-from using '-s'.

[mail/checkmail.git] / checkmail.pl

diff --git a/checkmail.pl b/checkmail.pl
index 53aa21f..9bf82b8 100644 (file)
--- a/checkmail.pl
+++ b/checkmail.pl
@@ -1,15 +1,15 @@
-#! /usr/bin/perl -W
+#! /usr/bin/perl -w
 #
-# checkmail Version 0.3 by Thomas Hochstein
+# checkmail Version 0.6.1 by Thomas Hochstein
 #
 # This script tries to verify the deliverability of (a) mail address(es).
 # 
-# Copyright (c) 2002-2010 Thomas Hochstein <thh@inter.net>
+# Copyright (c) 2002-2011 Thomas Hochstein <thh@inter.net>
 #
 # It can be redistributed and/or modified under the same terms under 
 # which Perl itself is published.
 
-our $VERSION = "0.3";
+our $VERSION = "0.6.2";
 
 ################################# Configuration ################################
 # Please fill in a working configuration!
@@ -39,7 +39,7 @@ getopts('Vhqlrf:m:s:e:', \%options);
 
 # -V: display version
 if ($options{'V'}) {
-  print "$myself v $VERSION\nCopyright (c) 2010 Thomas Hochstein <thh\@inter.net>\n";
+  print "$myself v $VERSION\nCopyright (c) 2010-2016 Thomas Hochstein <thh\@inter.net>\n";
   print "This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.\n";
   exit(100);
 };
@@ -67,7 +67,7 @@ if (!$options{'f'} and !$ARGV[0]) {
 };
 
 # -s / -e: override configuration
-$config{'from'} = $options{'s'} if $options{'s'};
+$config{'from'} = $options{'s'} if defined($options{'s'});
 $config{'helo'} = $options{'e'} if $options{'e'};
 
 # -f: open file and read addresses to @adresses
@@ -92,28 +92,36 @@ if ($options{'f'}) {
 my (%targets,$curstat,$status,$log,$message);
 foreach (@addresses) {
   my $address = $_;
-  my $domain = Mail::Address->new('',$address)->host;
-  printf("  * Testing %s ...\n",$address) if !($options{'q'});
-  $log .=  "\n===== BEGIN $address =====\n";
-  # get list of target hosts or take host forced via -m
-  if (!$options{'m'}) {
-         %targets = %{gettargets($domain,\$log)};
-  } else {
-    $message = sprintf("Connection to %s forced by -m.\n",$options{'m'});
-    $log .= $message;
-    print "    $message" if !($options{'q'});
-    # just one target host with preference 0
-    $targets{$options{'m'}} = 0;
-  };
-  if (%targets) {
-    $curstat = checkaddress($address,\%targets,\$log);
-  } else {
+  # regexp taken from http://www.regular-expressions.info/email.html
+  # with escaping of "/" added two times and "*" changed to "+"
+  # in localpart, second alternative
+  if ($address !~ /^(?:[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f]+)")@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/i) {
+    printf("  > Address <%s> is syntactically INVALID.\n",$address) if !($options{'q'});
     $curstat = 2;
-    $message = 'DNS lookup failure';
-    printf("  > Address is INVALID (%s).\n",$message) if !($options{'q'});
-    $log .= $message . '.';
+  } else {
+    my $domain = Mail::Address->new('',$address)->host;
+    printf("  * Testing %s ...\n",$address) if !($options{'q'});
+    $log .=  "\n===== BEGIN $address =====\n";
+    # get list of target hosts or take host forced via -m
+    if (!$options{'m'}) {
+           %targets = %{gettargets($domain,\$log)};
+    } else {
+      $message = sprintf("Connection to %s forced by -m.\n",$options{'m'});
+      $log .= $message;
+      print "    $message" if !($options{'q'});
+      # just one target host with preference 0
+      $targets{$options{'m'}} = 0;
+    };
+    if (%targets) {
+      $curstat = checkaddress($address,\%targets,\$log);
+    } else {
+      $curstat = 2;
+      $message = 'DNS lookup failure';
+      printf("  > Address is INVALID (%s).\n",$message) if !($options{'q'});
+      $log .= $message . '.';
+    };
+    $log   .=  "====== END $address ======\n";
   };
-  $log   .=  "====== END $address ======\n";
   $status = $curstat if (!defined($status) or $curstat > $status);
 };
 
@@ -216,10 +224,13 @@ sub checksmtp {
         # connection failure?
         if ($success < 0) {
           $status = connection_failed(@message);
+          # reset status - the address has been checked and _is_ valid!
+          $status = 3;
+          print "  > Address verification currently impossible. You'll have to try again or send a test mail ...\n" if !($options{'q'});
         # verification impossible?
         } elsif ($success) {
           $status = 3;
-          print "  > Address verificaton impossible. You'll have to send a test mail ...\n" if !($options{'q'});
+          print "  > Address verification impossible. You'll have to send a test mail ...\n" if !($options{'q'});
         }
       }
       # if -r is not set or status was not set to 3: valid address
@@ -429,6 +440,7 @@ The hostname to be used for I<HELO> or I<EHLO> in the SMTP dialog.
 =item B<$config{'from'}>
 
 The sender address to be used for I<MAIL FROM> while testing.
+May be empty ('') to set '<>' as MAIL FROM.
 
 =back
 
@@ -441,7 +453,8 @@ After configuring the script you may run your first test with
 
     checkmail user@example.org
 
-B<checkmail> will try to determine the mail exchanger(s) (MX)
+B<checkmail> will check the address for syntactic validity. If the
+address is valid, it will try to determine the mail exchanger(s) (MX)
 responsible for I<example.org> by querying the DNS for the respective
 MX records and then try to connect via SMTP (on port 25) to each of
 them in order of precedence (if necessary). It will run through the
@@ -514,6 +527,9 @@ B<Please note:> You shouldn't try to validate addresses while working
 from a dial-up or blacklisted host. If in doubt, use the B<-l> option
 to have a closer look on the SMTP dialog yourself.
 
+B<Please note:> To avoid shell expansion on addresses you submit to
+B<checkmail>, use B<batch processing>.
+
 =head1 OPTIONS
 
 =over 3