High-performance IP address matching for OpenResty Lua.

Table of Contents

• Name
• Table of Contents
• Synopsis
• Methods
  • ipmatcher.new
    • Usage
    • Example
  • ipmatcher.new_with_value
    • Usage
    • Example
  • ip:match
    • Usage
    • Example
  • ip:match_bin
    • Usage
    • Example
  • ipmatcher.parse_ipv4
  • ipmatcher.parse_ipv6
• Installation
  • From LuaRocks
  • From Source

Synopsis

location / {
    content_by_lua_block {
      local ipmatcher = require("resty.ipmatcher")
      local ip = ipmatcher.new({
          "127.0.0.1",
          "192.168.0.0/16",
          "::1",
          "fe80::/32",
      })

      ngx.say(ip:match("127.0.0.1"))
      ngx.say(ip:match("192.168.1.100"))
      ngx.say(ip:match("::1"))
    }
}

Back to TOC

Methods

ipmatcher.new

Creates a new hash table to store IP addresses.

Usage

ips is a list of IPv4 or IPv6 IP addresses in a CIDR format ({ip1, ip2, ip3, ...}).

ok, err = ipmatcher.new(ips)

Returns nil and the error if it fails to create a new ipmatcher instance.

Example

local ip, err = ipmatcher.new({
        "127.0.0.1", "192.168.0.0/16", "::1", "fe80::/16",
    })

Back to TOC

ipmatcher.new_with_value

Creates a new hash table to store IP addresses and corresponding values.

Usage

ips is a list of key-value pairs ({[ip1] = val1, [ip2] = val2, ...}), where each key is an IP address string (CIDR format for IPv4 and IPv6).

matcher, err = ipmatcher.new_with_value(ips)

Returns nil and the error if it fails to create a new ipmatcher instance.

Example

local ip, err = ipmatcher.new_with_value({
    ["127.0.0.1"] = {info = "a"},
    ["192.168.0.0/16"] = {info = "b"},
})
local data, err = ip:match("192.168.0.1")
print(data.info) -- "b"

If the IP address matches multiple values, the returned value can be either one of the values:

local ip, err = ipmatcher.new_with_value({
    ["192.168.0.1"] = {info = "a"},
    ["192.168.0.0/16"] = {info = "b"},
})
local data, err = ip:match("192.168.0.1")
print(data.info) -- "a" or "b"

Back to TOC

ip:match

Checks if an IP address exists in the specified IP list.

Usage

ip is an IP address string.

ok, err = ip:match(ip)

Returns true or value if the specified ip exists in the list. Returns false if the ip does not exist in the list. And returns false and an error message if the IP address is invalid.

Example

local ip, err = ipmatcher.new({
        "127.0.0.1", "192.168.0.0/16", "::1", "fe80::/16",
    })

local ok, err = ip:match("127.0.0.1") -- true

Back to TOC

ip:match_bin

Checks if an IP address in binary format exists in the specified IP list.

Usage

bin_ip is an IP address in binary format.

ok, err = ip:match_bin(bin_ip)

Returns true if the specified bin_ip exists in the list. Returns false if it does not exist. Returns nil and an error message if bin_ip is invalid.

Example

local ok, err = ip:match_bin(ngx.var.binary_remote_addr)

Back to TOC

ipmatcher.parse_ipv4

Tries to parse an IPv4 address to a host byte order FFI uint32_t type integer.

ipmatcher.parse_ipv4(ip)

Returns false if the IP address is invalid.

Back to TOC

ipmatcher.parse_ipv6

Tries to parse an IPv6 address to a table with four host byte order FF1 uint32_t type integer. The IP address can be wrapped in square brackets like [::1].

ipmatcher.parse_ipv6(ip)

Returns a false if the ip is not a valid IPv6 address.

Back to TOC

Installation

From LuaRocks

luarocks install lua-resty-ipmatcher

From Source

make install

Back to TOC