[net-dns-users] Bug with large txt RR ?

[Håkon Alstadheim]

Den 06.10.2026 18:13, skrev Doug Barton via net-dns-users:
> You're incorrect about what is coming from dig:
> [snip]

They differ. The pieces look the same at first glance, but Net::DNS 
messes up when glueing back together. Take all the pieces , removing 
anything outside double-quotes.

dig           gives you include:4788601.spf03.hu,
                                                         ^ no space
Net::DNS gives you include:478860 1.spf03.hu
                                                         ^space


>
> On 2026-10-06 10:55 AM, Håkon Alstadheim via net-dns-users wrote:
>> Hi all. New to the list, sorry if this has already been asked and 
>> answered, skimmed the archives, but I might have missed something. 
>> Note: I'm not showing the output here, some spam-filter refused to 
>> forward my initial attempt at this mail, trying without the dumps.
>>
>> I'm getting txt RRs for euronext.com, looking for the v=spf1 record. 
>> I get a split record, shown as dumped from Dumper.
>> eg if you run:
>> --- shell input ---
>> # perl -MNet::DNS -MData::Dumper -e '
>> $host="euronext.com";
>> my @txt2 = rr("$host","txt");
>> foreach $rr (@txt2){
>>   if($rr->rdstring =~ m(^.?v=spf1)){
>>    print "dumping spf perl rr for euronext.com:\n";
>>    print Dumper(\$rr);
>>    print "\n--\n";
>>    print "========\n";
>>    print "txtdata:|" . $rr->txtdata . "|\n";
>>   }
>> }
>> '
>> --- shell input ends ---
>> When getting the text value by 'print $rr->rdstring' (not shown), the 
>> quoting is messed up at the 511th character. $rr-txtdata is likewise 
>> messed up, it splits at the problematic point "include:478860 
>> 1.spf03.hu" has a space where there should be none. This I can work 
>> around, but it feels very untidy :).
>>
>> Using dig, does not show the same problem, e.g.:
>> --- code ---
>> $ dig euronext.com txt | grep 'v=spf1'
>> --- /code ---
>>
>> I'd love to provide a patch, but the decoding done in the perl module 
>> is beyond my ken. Help, anyone ?
>>
>> ---
>> Kind regards, Håkon Alstadheim
>> _______________________________________________
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>> net-dns-users at lists.nlnetlabs.nl
>> https://lists.nlnetlabs.nl/mailman/listinfo/net-dns-users
>
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