[PATCH] BUG10963: implement a better email verification

[Alexander Marx <alexander.marx@ipfire.org>]

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We now check all allowed chars in the address before the @ sign.

To check the fqdn of an email the function validfqdn has been adapted as
well. Here a valid domain part is for example: user(a)ipfire or user(a)localhost.localdomain

Signed-off-by: Alexander Marx <alexander.marx(a)ipfire.org>
---
 config/cfgroot/general-functions.pl | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/config/cfgroot/general-functions.pl b/config/cfgroot/general-functions.pl
index 2b5cd19..1bbcf85 100644
--- a/config/cfgroot/general-functions.pl
+++ b/config/cfgroot/general-functions.pl
@@ -653,9 +653,6 @@ sub validfqdn
 	# Checks a fully qualified domain name against RFC1035
         my $fqdn = $_[0];
 	my @parts = split (/\./, $fqdn);	# Split hostname at the '.'
-	if (scalar(@parts) < 2) {		# At least two parts should
-		return 0;}			# exist in a FQDN
-						# (i.e. hostname.domain)
 	foreach $part (@parts) {
 		# Each part should be at least one character in length
 		# but no more than 63 characters
@@ -747,14 +744,25 @@ sub ipcidr2msk {
 }
 
 sub validemail {
-    my $mail = shift;
-    return 0 if ( $mail !~ /^[0-9a-zA-Z\.\-\_]+\@[0-9a-zA-Z\.\-]+$/ );
-    return 0 if ( $mail =~ /^[^0-9a-zA-Z]|[^0-9a-zA-Z]$/);
-    return 0 if ( $mail !~ /([0-9a-zA-Z]{1})\@./ );
-    return 0 if ( $mail !~ /.\@([0-9a-zA-Z]{1})/ );
-    return 0 if ( $mail =~ /.\.\-.|.\-\..|.\.\..|.\-\-./g );
-    return 0 if ( $mail =~ /.\.\_.|.\-\_.|.\_\..|.\_\-.|.\_\_./g );
-    return 0 if ( $mail !~ /\.([a-zA-Z]{2,4})$/ );
+    my $address = shift;
+    my @parts = split( /\@/, $address );
+    my $anz=@parts;
+
+    #check if we have one part before and after '@'
+    return 0 if ( $anz != 2 );
+
+    #check if one of the parts starts or ends with a dot
+    return 0 if ( substr($parts[0],0,1) eq '.' );
+    return 0 if ( substr($parts[0],-1,1) eq '.' );
+    return 0 if ( substr($parts[1],0,1) eq '.' );
+    return 0 if ( substr($parts[1],-1,1) eq '.' );
+
+    #check first addresspart (before '@' sign)
+    return 0 if  ( $parts[0] !~ m/^[a-zA-Z0-9\.!\-\+#]+$/ );
+
+    #check second addresspart (after '@' sign)
+    return 0 if  ( !&validfqdn( $parts[1] ) );
+
     return 1;
 }
 
-- 
1.9.1