# Need a Logstash filter to query a rest api/tcp on conditional statement and return JSON response **URL:** \ **Category:** Logstash\ **Created:** [April 28, 2019, 9:05pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819 "2019-04-28T21:05:37Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![stcdarrell](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@stcdarrell](https://discuss.elastic.co/u/stcdarrell)\ **Post date:** [April 28, 2019, 9:05pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/1 "2019-04-28T21:05:37Z")
hi, i'd love some help, i've googled all i know to google, read the logstash documents.. and i'm still not finding what i need. i am bringing in a ton of logs from various sources dealing with network traffic. i'd like to have a rule that based on some conditions: -- if a field is an ipv4 ip address AND NOT an internal/private ip address send a query to an outside server to query if its a known bad/blacklisted IP or a good/whitelisted IP. i _THINK_ that can be done with the ``` if (conditions would go here) { filter { TCP { } #end TCP } #end filter } # end if ``` the curl command have running against the server would be something like this: `curl -H "Authorization:22de00b5e876adwhateverwhateverwhatever" -GET "http://XXX.XXX.XXX.XXX:5000/indicators/?q=@{indicator}"` and it works and returns a JSON response with the info i need. Am I on the right track here? i cant seem to find anyone doing anything like this.. maybe i'm not searching for the right thing.. any help or links to examples would be greatly appreciated. ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [April 28, 2019, 9:09pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/2 "2019-04-28T21:09:41Z")
You could use a [cidr](https://www.elastic.co/guide/en/logstash/current/plugins-filters-cidr.html) filter to add a tag if it matches private/internal networks, then test for the presence of the tag. ETA: You don't need to roll your own with a tcp filter you should be able to use an [http](https://www.elastic.co/guide/en/logstash/current/plugins-filters-http.html) filter with url, query, and headers options. ---
**Author:** ![stcdarrell](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@stcdarrell](https://discuss.elastic.co/u/stcdarrell)\ **Post date:** [April 29, 2019, 1:36am UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/3 "2019-04-29T01:36:24Z")
thank you, i didnt realize there was a cidr filter, that makes sense to use that, then tag based on it. what is the proper way to convert that curl statement i listed above into a filter {TCP {} } statement? i cant find any good examples of that. any help would be appreciated ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [April 29, 2019, 12:03pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/4 "2019-04-29T12:03:37Z")
As I said, I would suggest using an http filter rather than a tcp filter. ---
**Author:** ![stcdarrell](https://avatars.discourse-cdn.com/v4/letter/s/a183cd/32.png) [@stcdarrell](https://discuss.elastic.co/u/stcdarrell)\ **Post date:** [April 29, 2019, 7:23pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/5 "2019-04-29T19:23:11Z")
Badger thank you very much for your help. i'm about 80% there. I've got logstash communicating to my server. the query i need to run is this: (using curl from linux command prompt) `curl -H "Authorization:AuthTokenGoesHere" -GET "http://192.168.4.102:5000/indicators/?q=@{indicator}"` this curl statement works.. but i'm not having very much luck translating that into the HTTP format: ``` filter { if "externalAddress" in [tags] { rest { request => { url => "http://192.168.4.102:5000/indicators/?q=%{[source][address]}" method => "post" } #end request auth { Authorization => "AuthTokenGoesHere" } target => "cif" json => "true" } #end rest } # end if } # end filter ``` any suggestions would really appreciated. I cant seem to find any examples of this in the discussion forums or with google thank you Darrell ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [April 29, 2019, 7:47pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/6 "2019-04-29T19:47:13Z")
I would have used the standard http plugin rather than installing the rest filter. ``` http { url => "http://192.168.4.102:5000/indicators/" query => { "q" => "%{[source][address]}" } verb => POST headers => { "Authorization" => "AuthTokenGoesHere" } } ``` ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 27, 2019, 7:55pm UTC](https://discuss.elastic.co/t/need-a-logstash-filter-to-query-a-rest-api-tcp-on-conditional-statement-and-return-json-response/178819/7 "2019-05-27T19:55:54Z")
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