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Determine address of proxied request
This is a Node.js module available through the
npm registry. Installation is done using the
npm install
command:
$ npm install proxy-addr
var proxyaddr = require('proxy-addr')
Return the address of the request, using the given trust
parameter.
The trust
argument is a function that returns true
if you trust
the address, false
if you don’t. The closest untrusted address is
returned.
proxyaddr(req, function (addr) { return addr === '127.0.0.1' })
proxyaddr(req, function (addr, i) { return i < 1 })
The trust
arugment may also be a single IP address string or an
array of trusted addresses, as plain IP addresses, CIDR-formatted
strings, or IP/netmask strings.
proxyaddr(req, '127.0.0.1')
proxyaddr(req, ['127.0.0.0/8', '10.0.0.0/8'])
proxyaddr(req, ['127.0.0.0/255.0.0.0', '192.168.0.0/255.255.0.0'])
This module also supports IPv6. Your IPv6 addresses will be normalized
automatically (i.e. fe80::00ed:1
equals fe80:0:0:0:0:0:ed:1
).
proxyaddr(req, '::1')
proxyaddr(req, ['::1/128', 'fe80::/10'])
This module will automatically work with IPv4-mapped IPv6 addresses
as well to support node.js in IPv6-only mode. This means that you do
not have to specify both ::ffff:a00:1
and 10.0.0.1
.
As a convenience, this module also takes certain pre-defined names in addition to IP addresses, which expand into IP addresses:
proxyaddr(req, 'loopback')
proxyaddr(req, ['loopback', 'fc00:ac:1ab5:fff::1/64'])
loopback
: IPv4 and IPv6 loopback addresses (like ::1
and
127.0.0.1
).linklocal
: IPv4 and IPv6 link-local addresses (like
fe80::1:1:1:1
and 169.254.0.1
).uniquelocal
: IPv4 private addresses and IPv6 unique-local
addresses (like fc00:ac:1ab5:fff::1
and 192.168.0.1
).When trust
is specified as a function, it will be called for each
address to determine if it is a trusted address. The function is
given two arguments: addr
and i
, where addr
is a string of
the address to check and i
is a number that represents the distance
from the socket address.
Return all the addresses of the request, optionally stopping at the
first untrusted. This array is ordered from closest to furthest
(i.e. arr[0] === req.connection.remoteAddress
).
proxyaddr.all(req)
The optional trust
argument takes the same arguments as trust
does in proxyaddr(req, trust)
.
proxyaddr.all(req, 'loopback')
Compiles argument val
into a trust
function. This function takes
the same arguments as trust
does in proxyaddr(req, trust)
and
returns a function suitable for proxyaddr(req, trust)
.
var trust = proxyaddr.compile('loopback')
var addr = proxyaddr(req, trust)
This function is meant to be optimized for use against every request.
It is recommend to compile a trust function up-front for the trusted
configuration and pass that to proxyaddr(req, trust)
for each request.
$ npm test
$ npm run-script bench