[PATCH v2 2/2] dns.cgi: Fixes bug#12395 - German umlauts not correctly displayed in remarks

[Adolf Belka <adolf.belka@ipfire.org>]

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- If Freifunk München e.V. is entered as a remark it gets converted to
   Freifunk München e.V.
- This is because cleanhtml is used on the UTF-8 remark text before saving it to the file
   and the HTML::Entities::encode_entities command that is run on that remark text does
   not work with UTF-8 text.
- If the UTF-8 text in the remark is decoded before running through the cleanhtml command
   then the characters with diacritical marks are correctly shown.
- Have tested out the fix on a remark with a range of different characters with
   diacritical marks and all of the ones tested were displayed correctly with the fix while
   in the original form they were mangled.

Fixes: Bug#12395
Tested-by: Adolf Belka <adolf.belka(a)ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka(a)ipfire.org>
---
 html/cgi-bin/dns.cgi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/html/cgi-bin/dns.cgi b/html/cgi-bin/dns.cgi
index 0a34d3fd6..eb6f908d5 100644
--- a/html/cgi-bin/dns.cgi
+++ b/html/cgi-bin/dns.cgi
@@ -142,6 +142,13 @@ if (($cgiparams{'SERVERS'} eq $Lang::tr{'save'}) || ($cgiparams{'SERVERS'} eq $L
 	# Go further if there was no error.
 	if ( ! $errormessage) {
 		# Check if a remark has been entered.
+
+		# decode the UTF-8 text so that characters with diacritical marks such as
+		# umlauts are treated correctly by the following cleanhtml command
+		$cgiparams{'REMARK'} = decode("UTF-8", $cgiparams{'REMARK'});
+
+		# run the REMARK text through cleanhtml to ensure all unsafe html characters
+		# are correctly encoded to their html entities
 		$cgiparams{'REMARK'} = &Header::cleanhtml($cgiparams{'REMARK'});
 
 		my %dns_servers = ();
-- 
2.44.0