Upper limit on the number of regular expressions in url_regex?

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Upper limit on the number of regular expressions in url_regex?

Ralf Hildebrandt
I'm using this in squid-5.0:

acl markRw_urlbl annotate_transaction accessRule=rw_urlbl
acl rw_urlbl url_regex "/etc/squid5/generated-rw_urlbl.acl"
http_access deny rw_urlbl markRw_urlbl
deny_info   http://proxy.charite.de/rw_urlbl/ markRw_urlbl
# https://ransomwaretracker.abuse.ch/blocklist/ 30.3.16 RHI

And yes, it's quite big:

# wc -l /etc/squid5/generated-rw_urlbl.acl
10783 /etc/squid5/generated-rw_urlbl.acl

During reconfigure I noticed:

2017/08/08 15:56:45.413| WARNING: optimisation of regular expressions failed; using fallback method without optimisation

Now I increased debug_options (to 28,9) and found that squid is
repeatedly grouping the regular expressions until a buffer is "full",
the last such log entry is:

2017/08/08 15:56:45.413| 28,2| RegexData.cc(188) compileOptimisedREs: adding RE 'http://zzzort10xtest123.com/nin5k3bwo'
2017/08/08 15:56:45.413| 28,2| RegexData.cc(194) compileOptimisedREs: buffer full, generating new optimised RE...
2017/08/08 15:56:45.413| 28,2| RegexData.cc(125) compileRE: compiled '(http://zizicamarda.com/7fg3g)|(http://zizzhaida.com/3m6ij)|(http://zizzhaida.com/98g4ubq)|(http://zizzhaida.com/a0s9b)|(http://zjscs.org/oax
qpo4w7)|(http://zlotysalmo.net/0zx0ken3)|(http://zlotysalmo.net/3v8va8ov)|(http://zlotysalmo.net/75vepy6f)|(http://zlotysalmo.net/9v50aob)|(http://znany-lekarz.pl/wd7zj)|(http://zoekeith.com/qehggefyb)|(http://z
ona-sezona.com.ua/hj1lsp)|(http://zonabest.atspace.com/353wxy)|(http://zonnit.com/qargy9n)|(http://zoologiczny.cba.pl/okp987g7v)|(http://zoomwalls.com/k8j3tpoe)|(http://zoomwalls.com/zghpzv2f)|(http://zoonhers.n
et/3oojm4)|(http://zoonhers.net/4susie)|(http://zoonhers.net/5ngvr)|(http://zophotos.com/098tb)|(http://zorgboerderijtzicht.nl/lm3mhz)|(http://zpwang.net/9igbmnn)|(http://zsgxbgj.com/1324w)|(http://zsnbystre.rep
ublika.pl/988g765f)|(http://zsp17.y0.pl/jkYTFhb7)|(http://zsz_szyn.republika.pl/G7vuYhjb)|(http://zuerich-gewerbe.ch/mbv58gbv)|(http://zui9reica.web.fc2.com/87hcrn33g)|(http://zurrmax.de/hwajuip)|(http://zwei.au
dio/87h78rf33g)|(http://zwljfc.com/8765r)|(http://zyasf.com/cir9dl)|(http://zytrade.cn/1324w)|(http://zytrade.cn/aust7a6ik)|(http://zzzort10xtest123.com/nin5k3bwo)'
with flags 9

http://zzzort10xtest123.com/nin5k3bwo being the last line in the file
/etc/squid5/generated-rw_urlbl.acl

The last compilation seems to fail, and the next line in the log is:

2017/08/08 15:56:45.413| WARNING: optimisation of regular expressions failed; using fallback method without optimisation

whereupon each line becomes it's own RE:

2017/08/08 15:56:45.430| 28,2| RegexData.cc(125) compileRE: compiled 'http://00005ik.rcomhost.com/7fg3g' with flags 9
2017/08/08 15:56:45.431| 28,2| RegexData.cc(125) compileRE: compiled 'http://01ad681.netsolhost.com/7j0jlq3' with flags 9
2017/08/08 15:56:45.431| 28,2| RegexData.cc(125) compileRE: compiled 'http://023pc.cn/8hrnv3' with flags 9
2017/08/08 15:56:45.431| 28,2| RegexData.cc(125) compileRE: compiled 'http://027tzx.com/lscpv' with flags 9
...

But why is it failing?

Background:
===========

Running squid with > 10000 regular expressions causes all kinds of
strange behaviour - that'S why I noticed the problem in the first place.

--
Ralf Hildebrandt                   Charite Universitätsmedizin Berlin
[hidden email]        Campus Benjamin Franklin
https://www.charite.de             Hindenburgdamm 30, 12203 Berlin
Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155
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Re: Upper limit on the number of regular expressions in url_regex?

Ralf Hildebrandt
* Ralf Hildebrandt <[hidden email]>:

> But why is it failing?

I reordered the file

sort -r /etc/squid5/generated-rw_urlbl.acl > /etc/squid5/generated-rw_urlbl.acl.new
mv /etc/squid5/generated-rw_urlbl.acl.new /etc/squid5/generated-rw_urlbl.acl

and reconfigured squid:

2017/08/08 16:27:50.463| 28,2| RegexData.cc(212) compileOptimisedREs: 10775 REs are optimised into one RE.
2017/08/08 16:27:50.463| 28,2| RegexData.cc(214) compileOptimisedREs: /etc/squid5/squid.conf line 1710: acl rw_urlbl url_regex "/etc/squid5/generated-rw_urlbl.acl"
2017/08/08 16:27:50.463| 28,2| RegexData.cc(216) compileOptimisedREs: WARNING: there are more than 100 regular expressions. Consider using less REs or use rules without expressions like 'dstdomain'.

and it's working...

--
Ralf Hildebrandt                   Charite Universitätsmedizin Berlin
[hidden email]        Campus Benjamin Franklin
https://www.charite.de             Hindenburgdamm 30, 12203 Berlin
Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155
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Re: Upper limit on the number of regular expressions in url_regex?

Ralf Hildebrandt
In reply to this post by Ralf Hildebrandt
* Ralf Hildebrandt <[hidden email]>:

> But why is it failing?

Turns out that I can minimize the failure to a short list of regular
expressions:

2017/08/08 16:35:09.164| 28,2| RegexData.cc(244) parse: new Regex line or file
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizicamarda.com/7fg3g'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizzhaida.com/3m6ij'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizzhaida.com/98g4ubq'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizzhaida.com/a0s9b'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zjscs.org/oaxqpo4w7'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/0zx0ken3'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/3v8va8ov'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/75vepy6f'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/9v50aob'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://znany-lekarz.pl/wd7zj'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoekeith.com/qehggefyb'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zona-sezona.com.ua/hj1lsp'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zonabest.atspace.com/353wxy'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zonnit.com/qargy9n'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoologiczny.cba.pl/okp987g7v'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoomwalls.com/k8j3tpoe'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoomwalls.com/zghpzv2f'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoonhers.net/3oojm4'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoonhers.net/4susie'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoonhers.net/5ngvr'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zophotos.com/098tb'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zorgboerderijtzicht.nl/lm3mhz'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zpwang.net/9igbmnn'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsgxbgj.com/1324w'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsnbystre.republika.pl/988g765f'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsp17.y0.pl/jkYTFhb7'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsz_szyn.republika.pl/G7vuYhjb'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zuerich-gewerbe.ch/mbv58gbv'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zui9reica.web.fc2.com/87hcrn33g'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zurrmax.de/hwajuip'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zwei.audio/87h78rf33g'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zwljfc.com/8765r'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zyasf.com/cir9dl'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zytrade.cn/1324w'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zytrade.cn/aust7a6ik'
2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zzzort10xtest123.com/nin5k3bwo'
...
2017/08/08 16:35:09.165| 28,2| RegexData.cc(125) compileRE: compiled '(http://zizicamarda.com/7fg3g)|(http://zizzhaida.com/3m6ij)|(http://zizzhaida.com/98g4ubq)|(http://zizzhaida.com/a0s9b)|(http://zjscs.org/oaxqpo4w7)|(http://zlotysalmo.net/0zx0ken3)|(http://zlotysalmo.net/3v8va8ov)|(http://zlotysalmo.net/75vepy6f)|(http://zlotysalmo.net/9v50aob)|(http://znany-lekarz.pl/wd7zj)|(http://zoekeith.com/qehggefyb)|(http://zona-sezona.com.ua/hj1lsp)|(http://zonabest.atspace.com/353wxy)|(http://zonnit.com/qargy9n)|(http://zoologiczny.cba.pl/okp987g7v)|(http://zoomwalls.com/k8j3tpoe)|(http://zoomwalls.com/zghpzv2f)|(http://zoonhers.net/3oojm4)|(http://zoonhers.net/4susie)|(http://zoonhers.net/5ngvr)|(http://zophotos.com/098tb)|(http://zorgboerderijtzicht.nl/lm3mhz)|(http://zpwang.net/9igbmnn)|(http://zsgxbgj.com/1324w)|(http://zsnbystre.republika.pl/988g765f)|(http://zsp17.y0.pl/jkYTFhb7)|(http://zsz_szyn.republika.pl/G7vuYhjb)|(http://zuerich-gewerbe.ch/mbv58gbv)|(http://zui9reica.web.fc2.com/87hcrn33g)|(http://zurrmax.de/hwajuip)|(http://zwei.audio/87h78rf33g)|(http://zwljfc.com/8765r)|(http://zyasf.com/cir9dl)|(http://zytrade.cn/1324w)|(http://zytrade.cn/aust7a6ik)|(http://zzzort10xtest123.com/nin5k3bwo)' with flags 9
2017/08/08 16:35:09.165| WARNING: optimisation of regular expressions failed; using fallback method without optimisation

maybe it's an issue with the regexp library?

--
Ralf Hildebrandt                   Charite Universitätsmedizin Berlin
[hidden email]        Campus Benjamin Franklin
https://www.charite.de             Hindenburgdamm 30, 12203 Berlin
Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155
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Re: Upper limit on the number of regular expressions in url_regex?

Marcus Kool
I have only seen regex failing with such short RE on AIX.
what is your OS, distro, CPU and lib version ?

BTW: why use regular expressions for a list of 10000+ _fixed_ URLs ?

Marcus


On 08/08/17 11:44, Ralf Hildebrandt wrote:

> * Ralf Hildebrandt <[hidden email]>:
>
>> But why is it failing?
>
> Turns out that I can minimize the failure to a short list of regular
> expressions:
>
> 2017/08/08 16:35:09.164| 28,2| RegexData.cc(244) parse: new Regex line or file
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizicamarda.com/7fg3g'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizzhaida.com/3m6ij'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizzhaida.com/98g4ubq'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zizzhaida.com/a0s9b'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zjscs.org/oaxqpo4w7'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/0zx0ken3'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/3v8va8ov'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/75vepy6f'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zlotysalmo.net/9v50aob'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://znany-lekarz.pl/wd7zj'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoekeith.com/qehggefyb'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zona-sezona.com.ua/hj1lsp'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zonabest.atspace.com/353wxy'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zonnit.com/qargy9n'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoologiczny.cba.pl/okp987g7v'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoomwalls.com/k8j3tpoe'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoomwalls.com/zghpzv2f'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoonhers.net/3oojm4'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoonhers.net/4susie'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zoonhers.net/5ngvr'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zophotos.com/098tb'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zorgboerderijtzicht.nl/lm3mhz'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zpwang.net/9igbmnn'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsgxbgj.com/1324w'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsnbystre.republika.pl/988g765f'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsp17.y0.pl/jkYTFhb7'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zsz_szyn.republika.pl/G7vuYhjb'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zuerich-gewerbe.ch/mbv58gbv'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zui9reica.web.fc2.com/87hcrn33g'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zurrmax.de/hwajuip'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zwei.audio/87h78rf33g'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zwljfc.com/8765r'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zyasf.com/cir9dl'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zytrade.cn/1324w'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zytrade.cn/aust7a6ik'
> 2017/08/08 16:35:09.164| 28,3| RegexData.cc(253) parse: buffering RE 'http://zzzort10xtest123.com/nin5k3bwo'
> ...
> 2017/08/08 16:35:09.165| 28,2| RegexData.cc(125) compileRE: compiled '(http://zizicamarda.com/7fg3g)|(http://zizzhaida.com/3m6ij)|(http://zizzhaida.com/98g4ubq)|(http://zizzhaida.com/a0s9b)|(http://zjscs.org/oaxqpo4w7)|(http://zlotysalmo.net/0zx0ken3)|(http://zlotysalmo.net/3v8va8ov)|(http://zlotysalmo.net/75vepy6f)|(http://zlotysalmo.net/9v50aob)|(http://znany-lekarz.pl/wd7zj)|(http://zoekeith.com/qehggefyb)|(http://zona-sezona.com.ua/hj1lsp)|(http://zonabest.atspace.com/353wxy)|(http://zonnit.com/qargy9n)|(http://zoologiczny.cba.pl/okp987g7v)|(http://zoomwalls.com/k8j3tpoe)|(http://zoomwalls.com/zghpzv2f)|(http://zoonhers.net/3oojm4)|(http://zoonhers.net/4susie)|(http://zoonhers.net/5ngvr)|(http://zophotos.com/098tb)|(http://zorgboerderijtzicht.nl/lm3mhz)|(http://zpwang.net/9igbmnn)|(http://zsgxbgj.com/1324w)|(http://zsnbystre.republika.pl/988g765f)|(http://zsp17.y0.pl/jkYTFhb7)|(http://zsz_szyn.republika.pl/G7vuYhjb)|(http://zuerich-gewerbe.ch/mbv58gbv)|(http://zui9reica.web.fc2.com/87hcrn33g)|(http://zurrmax.de/hwajuip)|(http://zwei.audio/87h78rf33g)|(http://zwljfc.com/8765r)|(http://zyasf.com/cir9dl)|(http://zytrade.cn/1324w)|(http://zytrade.cn/aust7a6ik)|(http://zzzort10xtest123.com/nin5k3bwo)' with flags 9
> 2017/08/08 16:35:09.165| WARNING: optimisation of regular expressions failed; using fallback method without optimisation
>
> maybe it's an issue with the regexp library?
>
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Re: Upper limit on the number of regular expressions in url_regex?

Ralf Hildebrandt
* Marcus Kool <[hidden email]>:
> I have only seen regex failing with such short RE on AIX.
> what is your OS, distro, CPU and lib version ?

Ubuntu Linux LTS 16.04 (xenial)
x86_64 (amd64)

I guess you mean libc:
ii  libc6:amd64                            2.23-0ubuntu9
                   
> BTW: why use regular expressions for a list of 10000+ _fixed_ URLs ?

What is the alternative?
 
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[hidden email]        Campus Benjamin Franklin
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Re: Upper limit on the number of regular expressions in url_regex?

Marcus Kool


On 09/08/17 05:15, Ralf Hildebrandt wrote:
> * Marcus Kool <[hidden email]>:
>> I have only seen regex failing with such short RE on AIX.
>> what is your OS, distro, CPU and lib version ?
>
> Ubuntu Linux LTS 16.04 (xenial)
> x86_64 (amd64)
>
> I guess you mean libc:
> ii  libc6:amd64                            2.23-0ubuntu9

I see no issues with the optimised RE so my first guess is a libc bug.

The RE optimisation in Squid is inspired by the RE optimisation in ufdbGuard.
ufdbGuard optimises the RE a bit different and it looks like this:
zizicamarda.com/7fg3g|zizzhaida.com/3m6ij|zizzhaida.com/98g4ubq|...
I have tested this optimised RE on Ubuntu 16.04 and it works so maybe it is not a libc bug but a Squid bug.

>> BTW: why use regular expressions for a list of 10000+ _fixed_ URLs ?
>
> What is the alternative?

ufdbGuard is a URL filter that converts a file with 10000 URLs to a database file that is optimised for fast lookups.
So all you need to do is configure a URL rewriter and you can filter those URLs, using fixed URLs not REs.

Marcus

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