[syslog-ng] 3.7.1 elasticsearch destination bug when dealing with unicode encoding.

[Scheidler, Balázs]

Hi,

Do i understand correctly that you added <U+1F633> in place of utf8
sequences in the email and the file contains utf8 encoding of the same
value?

My theory right now is that elastic uses a 16bit representation of unicode
codepoints,  and 1f633 doesnt fit there. But I couldnt come up with
plausible explanation how it would become ð<U+009F><U+0098>³

Syslog-ng uses utf8 internally, so it should work with long utf8 sequences
without problems. Do you perhaps have an encoding() option at the elastic
destination?

It could also be a problem in the elastic java plugin, I dont know how we
supply the data. @juhaszviktor do you see any chance of this happening in
the java code?
On Oct 2, 2015 20:19, "Evan Rempel" <erempel at uvic.ca> wrote:

> I think I havecome across a bug in the elasticsearch destination where log
> lines with UTF8 characters result in a shortend message length attribute
> which results in a slightly truncated json object being sent to
> elasticsearch.
>
>
> and here is the source syslog line at our syslog server. This is where the
> json object is created.
>
> 2015-10-02T10:22:47-07:00
> local at sandtiger.comp.uvic.ca/sandtiger.comp.uvic.ca mail.warning
> mimedefang.pl[10880]: t92HMkGW028396: Allowing attachment named
> OutlookEmoji-<U+1F633>.png, ext=.png, type=image/png, RELAY=
> mail-bn1on0131.outbound.protection.outlook.com [157.56.110.131],
> FROM=<Holly.Richardson at Dal.Ca>, TO=<cobyt at uvic.ca>
>
> Here is the json object as logged to a file destination on the same host
> that is rujnning the elasticsearch destination. This is just looging
> $MESSAGE since the payload is already JSON.
>
> {"flare":{"profile":"DCS"},"cfgmgrrole":"INFRA","cfgmgrosFull":"Redhat
> 5_64","cfgmgros":"unix","cfgmgrmodel":"ESX
> 5","cfgmgrlocation":"ESX-PROD","cfgmgrenvironment":"Prod","cfgmgrassetType":"Virtual
> Server","SOURCEHOST":"sandtiger.comp.uvic.ca
> ","SHORTHOST":"sandtiger","PROGRAM":"mimedefang.pl","PRIORITY":"warning","PID":"10880","PATTERNID":"377","MESSAGE":"t92HMkGW028396:
> Allowing attachment named OutlookEmoji-<U+1F633>.png, ext=.png,
> type=image/png,
> RELAY=mail-bn1on0131.outbound.protection.outlook.com [157.56.110.131],
> FROM=<Holly.Richardson at Dal.Ca>, TO=<cobyt at uvic.ca
> >","ISODATE":"2015-10-02T10:22:47-07:00","HOST":"sandtiger.comp.uvic.ca
> ","FACILITY":"mail"}
>
> This is the same conent that is sent to the elasticsearch destination --
> option("message-template", "$MESSAGE\n")
>
> and here is the failed message from the elasticsearch server
>
> [2015-10-02 10:22:48,630][DEBUG][action.bulk              ] [sponge]
> [flare-2015.10.02.17][2] failed to execute bulk item (index) index
> {[flare-2015.10.02.17][test][AVApk-CyhIyyHCO_k_bc],
> source[{"flare":{"profile":"DCS"},"cfgmgrrole":"INFRA","cfgmgrosFull":"Redhat
> 5_64","cfgmgros":"unix","cfgmgrmodel":"ESX
> 5","cfgmgrlocation":"ESX-PROD","cfgmgrenvironment":"Prod","cfgmg
> rassetType":"Virtual Server","SOURCEHOST":"sandtiger.comp.uvic.ca
> ","SHORTHOST":"sandtiger","PROGRAM":"mimedefang.pl","PRIORITY":"warning","PID":"10880","PATTERNID":"377","MESSAGE":"t92HMkGW028396:
> Allowing attachment named OutlookEmoji-ð<U+009F><U+0098>³.png, ext=.png,
> type=image/png, RELAY=mail-bn1on0131.outbound.protection.outlook.com
> [157.56.110.131], FROM=<Holly.Rich
> ardson at Dal.Ca>, TO=<cobyt at uvic.ca
> >","ISODATE":"2015-10-02T10:22:47-07:00","HOST":"sandtiger.comp.uvic.ca
> ","FACILITY":"mail]}
>
>
>
> Note that the source has unicde data as <U+1F633>
> The elasticsearch destination is sent <U+1F633>
> but the elastisearch server logs ð<U+009F><U+0098>³
>
> The elasticsearch server also seems to end the message with the text
>
>   "FACILITY":"mail
>
> when it should end with
>
> "FACILITY":"mail"}
>
> so it is missing two characters.
>
> Does anyone want to guess at what is happening?
>
> Should I post to the elasticsearch group with the reasoning that the
> source (syslog-ng) and the destination (elasticsearch) need to be
> configured with the same unicode settings?
>
> Thanks,
>
> --
> Evan Rempel                                      erempel at uvic.ca
> Senior Systems Administrator                        250.721.7691
> Data Centre Services, University Systems, University of Victoria
>
>
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