network-addresses

Network addresses manipulation library.

This library lets you have an abstraction over IP addresses (ipv4 only for now) to manipulate them. Namely, there are 2 main abstractions:

• IP networks
• IP addresses

An IP network consists of 2 things: a value and a subnet length, e.g. 192.168.0.0/16.

An IP address only consists of a value.

API

Class hierarchy

There exists 4 classes, best explained with their definitions:

(defclass network ()
  ((integer-value :initarg :integer-value :reader as-int)
   (subnet-length :initarg :subnet-length :reader subnet-length)
   (width :reader width :initform (error "Not implemented."))
   (max-value :reader max-value :initform (error "Not implemented."))))

(defclass ipv4-network (na:network)
  ((na:width :reader na:width :initform 32)
   (na:max-value :reader na:max-value :initform #xFFFFFFFF)))

(defclass address ()
  ((integer-value :initarg :integer-value :reader as-int)))

(defclass ipv4-address (na:address) ())

Packages

The network-addresses system provides 2 packages: network-addresses (nicknamed na) and network-addresses-ipv4 (nicknamed na4). The na package holds most of the public symbols, while na4 has the ipv4-specific functions.

network-addresses-ipv4 package

make-network-from-cidr

Takes a string representing a network in the CIDR notation, returns an ipv4-network.

Example:

CL-USER> (na4:make-network-from-cidr "192.168.0.0/16")
#<NETWORK-ADDRESSES-IPV4::IPV4-NETWORK 192.168.0.0/16>

network-addresses package

Conditions

This package can raise the na:invalid-format condition when an invalid IP address is provided to make-network-from-cidr.

network methods/functions

List of methods and functions that act on network objects. This list does not include the slot readers.

####### as-str

Returns the network value as a string.

Example:

CL-USER> (na:as-str (na4:make-network-from-cidr "192.168.0.0/16"))
"192.168.0.0/16"

####### netmask

Returns the netmask of the network as an address.

Example:

CL-USER> (na:netmask (na4:make-network-from-cidr "192.168.0.0/16"))
#<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 255.255.0.0>

####### netmask-int

Returns the netmask of the network as an integer.

Example:

CL-USER> (na:netmask-int (na4:make-network-from-cidr "192.168.0.0/16"))
4294901760

####### hostmask

Returns the hostmask of the network as an address.

Example:

CL-USER> (na:hostmask (na4:make-network-from-cidr "192.168.0.0/16"))
#<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 0.0.255.255>

####### hostmask-int

Returns the hostmask of the network as an integer.

Example:

CL-USER> (na:hostmask-int (na4:make-network-from-cidr "192.168.0.0/16"))
65535

####### broadcast

Returns the broadcast of the network as an address.

Example:

CL-USER> (na:broadcast (na4:make-network-from-cidr "192.168.0.0/16"))
#<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 192.168.255.255>

####### broadcast-int

Returns the broadcast of the network as an integer.

Example:

CL-USER> (na:broadcast-int (na4:make-network-from-cidr "192.168.0.0/16"))
3232301055

####### addresses

Returns the list of IP addresses (excluding first and last) of the network as a list of address.

Example:

CL-USER> (na:addresses (na4:make-network-from-cidr "192.168.0.0/30"))
(#<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 192.168.0.1>
 #<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 192.168.0.2>)

####### addresses-int

Returns the list of IP addresses (excluding first and last) of the network as a list of integers.

Example:

CL-USER> (na:addresses-int (na4:make-network-from-cidr "192.168.0.0/30"))
(3232235521 3232235522)

####### first-address

Returns the first IP address of the network as an address.

Example:

CL-USER> (na:first-address (na4:make-network-from-cidr "192.168.0.0/30"))
#<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 192.168.0.0>

####### first-address-int

Returns the first IP address of the network as an integer.

Example:

CL-USER> (na:first-address-int (na4:make-network-from-cidr "192.168.0.0/30"))
3232235520

####### last-address

Returns the last IP address of the network as an address.

Example:

CL-USER> (na:last-address (na4:make-network-from-cidr "192.168.0.0/30"))
#<NETWORK-ADDRESSES-IPV4::IPV4-ADDRESS 192.168.0.3>

####### last-address-int

Returns the last IP address of the network as an integer.

Example:

CL-USER> (na:last-address-int (na4:make-network-from-cidr "192.168.0.0/30"))
3232235523

address methods/functions

List of methods and functions that act on address objects. This list does not include the slot readers.

####### as-str

Returns the address value as a string.

Example:

CL-USER> (na:as-str (na:first-address (na4:make-network-from-cidr "192.168.0.0/16")))
"192.168.0.0"

License

This software is provided under the MIT license. Please see the LICENSE file.