[
https://issues.apache.org/jira/browse/JAMES-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513089
]
Ralf Hauser commented on JAMES-796:
-----------------------------------
again, sure using a perfect dns server avoids the problem. However a little
more studying the dns servers without recursive lookup, it appears that the
solution is the following
in rawDNSLookup(String namestr, boolean querysent, int type,
ExtendedResolver reslvr)
extend
if (rcode == Rcode.NOERROR || rcode == Rcode.NXDOMAIN) {
cached = cache.addMessage(response);
if (cached != null && cached.isSuccessful()) {
return processSetResponse(cached);
}
}
to
if (rcode == Rcode.NOERROR || rcode == Rcode.NXDOMAIN) {
cached = cache.addMessage(response);
if (cached != null ) { if (
cached.isSuccessful()) {
return processSetResponse(cached);
}
if (cached.isDelegation()) {
RRset rs = cached.getNS();
if (null == rs) {
log.error("null == rs", new
Exception());
} else {
// log.debug(rs.getDClass());
// log.debug(rs.getName());
// log.debug(rs.getTTL());
// log.debug(rs.getType());
if (0 == rs.size()) {
log.error("0 ==
rs.size()", new Exception());
} else {
Iterator it = rs.rrs();
// it = rs.sigs();
// log.debug(it);
String[] authoritatDNS
= new String[rs.size()];
int i = 0;
while (it.hasNext()) {
authoritatDNS[i] = ((NSRecord) it.next()).getTarget().toString();
i++;
}
log.debug("found " + i
+ " new DNS servers");
ExtendedResolver
reslvrDom = new ExtendedResolver(authoritatDNS);
return
rawDNSLookup(namestr, false, type, reslvrDom);
}
}
}
}
ps, it appears, however that not the sunrise.ch dns servers, but
"194.246.118.118" and "212.25.28.55" are the culprits!
> Do also query authoritative nameservers to obtain MX record
> -----------------------------------------------------------
>
> Key: JAMES-796
> URL: https://issues.apache.org/jira/browse/JAMES-796
> Project: James
> Issue Type: Improvement
> Reporter: Armin Häberling
>
> for example for zunft-oberstrass.ch
> DNSServer.lockup("zunft-oberstrass.ch", Type.MX, "MX")
> will return null, but
> DNSServer.lockup("zunft-oberstrass.ch", Type.NS, "NS")
> will return two authoritative nameservers, which then can be queried and
> return the MX record for zunft-oberstrass.ch.
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