GitHub user nickwallen reopened a pull request:
https://github.com/apache/incubator-metron/pull/305
METRON-403 Bro Elasticsearch index item fails when DNS response includes
CNAME
### Problem
[METRON-403](https://issues.apache.org/jira/browse/METRON-403)
When the Bro DNS logs contain FQDNs in the 'answers' field, writing to the
Elasticsearch index fails with the following exception.
```
2016-09-21 09:13:28.360 o.a.m.w.BulkWriterComponent [ERROR] Failing 5 tuples
java.lang.Exception: failure in bulk execution:
[1]: index [bro_index_2016.09.21.09], type [bro_doc], id
[AVdMBXQSDU1LLSTQd0pk], message [MapperParsingException[failed to parse
[answers]]; nested: IllegalArgumentException[failed to parse ip
[clients.l.google.com], not a valid ip address];]
at
org.apache.metron.elasticsearch.writer.ElasticsearchWriter.write(ElasticsearchWriter.java:173)
~[stormjar.jar:?]
at
org.apache.metron.writer.BulkWriterComponent.write(BulkWriterComponent.java:108)
[stormjar.jar:?]
at
org.apache.metron.writer.bolt.BulkMessageWriterBolt.execute(BulkMessageWriterBolt.java:98)
[stormjar.jar:?]
at
```
### Solution
The template for the Bro index is constructed expecting that the 'answers'
field is one or more IPv4 addresses. This is not always the case. The field is
[described as a vector of
strings](https://www.bro.org/sphinx/scripts/base/protocols/dns/main.bro.html#type-DNS::Info)
and can include an IPv4, IPv6 or a hostname depending on the type of DNS
response message.
```
{"dns": {"uid": "C05DzHkyLOXv22Cgl", ..., "answers": ["daysofyorr.com",
"50.28.53.156"], ...}
```
I altered the default Elasticsearch Bro index template to expect a string,
rather than simply IPv4. This has no impact to Metron's default dashboard.
### Testing
This change was tested by running an end-to-end test on the "Quick Dev"
platform.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/nickwallen/incubator-metron METRON-403
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-metron/pull/305.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #305
----
commit 0c983b8be80adf7ba63a69bb2f7f3d429c0cb5aa
Author: Nick Allen <n...@nickallen.org>
Date: 2016-10-11T21:01:27Z
METRON-403 Bro Elasticsearch index item fails when DNS response includes
CNAME
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