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|
=encoding utf-8
=head1 NAME
ngx_http_geo_module - Module ngx_http_geo_module
=head1
The C<ngx_http_geo_module> module creates variables
with values depending on the client IP address.
=head1 Example Configuration
geo $geo {
default 0;
127.0.0.1 2;
192.168.1.0/24 1;
10.1.0.0/16 1;
::1 2;
2001:0db8::/32 1;
}
=head1 Directives
=head2 geo
B<syntax:> geo I<[I<C<$address>>] I<C<$variable>> { B<...> } >
B<context:> I<http>
Describes the dependency of values of the specified variable
on the client IP address.
By default, the address is taken from the C<$remote_addr> variable,
but it can also be taken from another variable (0.7.27), for example:
geo $arg_remote_addr $geo {
...;
}
B<NOTE>
Since variables are evaluated only when used, the mere existence
of even a large number of declared “C<geo>” variables
does not cause any extra costs for request processing.
If the value of a variable does not represent a valid IP address
then the “C<255.255.255.255>” address is used.
Addresses are specified either as prefixes in CIDR notation
(including individual addresses) or as ranges (0.7.23).
B<NOTE>
IPv6 prefixes are supported starting from versions 1.3.10 and 1.2.7.
The following special parameters are also supported:
=over
=item C<delete>
deletes the specified network (0.7.23).
=item C<default>
a value set to the variable if the client address does not
match any of the specified addresses.
When addresses are specified in CIDR notation,
“C<0.0.0.0E<sol>0>” and “C<::E<sol>0>”
can be used instead of C<default>.
When C<default> is not specified, the default
value will be an empty string.
=item C<include>
includes a file with addresses and values.
There can be several inclusions.
=item C<proxy>
defines trusted addresses (0.8.7, 0.7.63).
When a request comes from a trusted address,
an address from the C<X-Forwarded-For> request
header field will be used instead.
In contrast to the regular addresses, trusted addresses are
checked sequentially.
B<NOTE>
Trusted IPv6 addresses are supported starting from versions 1.3.0 and 1.2.1.
=item C<proxy_recursive>
enables recursive address search (1.3.0, 1.2.1).
If recursive search is disabled then instead of the original client
address that matches one of the trusted addresses, the last
address sent in C<X-Forwarded-For> will be used.
If recursive search is enabled then instead of the original client
address that matches one of the trusted addresses, the last
non-trusted address sent in C<X-Forwarded-For> will be used.
=item C<ranges>
indicates that addresses are specified as ranges (0.7.23).
This parameter should be the first.
To speed up loading of a geo base, addresses should be put in ascending order.
=back
Example:
geo $country {
default ZZ;
include conf/geo.conf;
delete 127.0.0.0/16;
proxy 192.168.100.0/24;
proxy 2001:0db8::/32;
127.0.0.0/24 US;
127.0.0.1/32 RU;
10.1.0.0/16 RU;
192.168.1.0/24 UK;
}
The F<confE<sol>geo.conf> file could contain the following lines:
10.2.0.0/16 RU;
192.168.2.0/24 RU;
A value of the most specific match is used.
For example, for the 127.0.0.1 address the value “C<RU>”
will be chosen, not “C<US>”.
Example with ranges:
geo $country {
ranges;
default ZZ;
127.0.0.0-127.0.0.0 US;
127.0.0.1-127.0.0.1 RU;
127.0.0.1-127.0.0.255 US;
10.1.0.0-10.1.255.255 RU;
192.168.1.0-192.168.1.255 UK;
}
|
