| Mail::SpamAssassin::Plugin::ASN - phpMan
Mail::SpamAssassin::Plugin::ASNUser)Contributed Perl DocumentMail::SpamAssassin::Plugin::ASN(3pm)
NAME
Mail::SpamAssassin::Plugin::ASN - SpamAssassin plugin to look up the Autonomous System
Number (ASN) of the connecting IP address.
SYNOPSIS
loadplugin Mail::SpamAssassin::Plugin::ASN
asn_lookup asn.routeviews.org _ASN_ _ASNCIDR_
add_header all ASN _ASN_ _ASNCIDR_
DESCRIPTION
This plugin uses DNS lookups to the services of an external DNS zone such as at
"http://www.routeviews.org/" to do the actual work. Please make sure that your use of the
plugin does not overload their infrastructure - this generally means that you should not
use this plugin in a high-volume environment or that you should use a local mirror of the
zone (see "ftp://ftp.routeviews.org/dnszones/"). Other similar zones may also be used.
TEMPLATE TAGS
This plugin allows you to create template tags containing the connecting IP's AS number
and route info for that AS number.
The default config will add a header field that looks like this:
X-Spam-ASN: AS24940 213.239.192.0/18
where "24940" is the ASN and "213.239.192.0/18" is the route announced by that ASN where
the connecting IP address came from. If the AS announces multiple networks (more/less
specific), they will all be added to the "_ASNCIDR_" tag, separated by spaces, eg:
X-Spam-ASN: AS1680 89.138.0.0/15 89.139.0.0/16
Note that the literal "AS" before the ASN in the _ASN_ tag is configurable through the
asn_prefix directive and may be set to an empty string.
CONFIGURATION
The standard ruleset contains a configuration that will add a header field containing ASN
data to scanned messages. The bayes tokenizer will use the added header field for bayes
calculations, and thus affect which BAYES_* rule will trigger for a particular message.
Note that in most cases you should not score on the ASN data directly. Bayes learning
will probably trigger on the _ASNCIDR_ tag, but probably not very well on the _ASN_ tag
alone.
SEE ALSO
http://www.routeviews.org/ - all data regarding routing, ASNs, etc....
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4770 - SpamAssassin Issue #4770
concerning this plugin
STATUS
No in-depth analysis of the usefulness of bayes tokenization of ASN data has been
performed.
ADMINISTRATOR SETTINGS
asn_lookup asn-zone.example.com [ _ASNTAG_ _ASNCIDRTAG_ ]
Use this to lookup the ASN info in the specified zone for the first external IP
address and add the AS number to the first specified tag and routing info to the
second specified tag.
If no tags are specified the AS number will be added to the _ASN_ tag and the routing
info will be added to the _ASNCIDR_ tag. You must specify either none or both of the
tag names. Tag names must start and end with an underscore.
If two or more asn_lookups use the same set of template tags, the results of their
lookups will be appended to each other in the template tag values in no particular
order. Duplicate results will be omitted when combining results. In a similar
fashion, you can also use the same template tag for both the AS number tag and the
routing info tag.
Examples:
asn_lookup asn.routeviews.org
asn_lookup asn.routeviews.org _ASN_ _ASNCIDR_
asn_lookup myview.example.com _MYASN_ _MYASNCIDR_
asn_lookup asn.routeviews.org _COMBINEDASN_ _COMBINEDASNCIDR_
asn_lookup myview.example.com _COMBINEDASN_ _COMBINEDASNCIDR_
asn_lookup in1tag.example.net _ASNDATA_ _ASNDATA_
clear_asn_lookups
Removes any previously declared asn_lookup entries from a list of queries.
asn_prefix 'prefix_string' (default: 'AS')
The string specified in the argument is prepended to each ASN when storing it as a
tag. This prefix is rather redundant, but its default value 'AS' is kept for backward
compatibility with versions of SpamAssassin earlier than 3.4.0. A sensible setting is
an empty string. The argument may be (but need not be) enclosed in single or double
quotes for clarity.
perl v5.20.1 2014-02-07 Mail::SpamAssassin::Plugin::ASN(3pm)
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