terraform-provider-utils

A Terraform provider that exposes utility functions for CIDR/IP network operations.

Functions

cidrcontains(containing_prefix, contained_prefix)

Returns true if the containing CIDR prefix fully encompasses the contained CIDR prefix.

provider::utils::cidrcontains("10.0.0.0/8", "10.1.0.0/16")    # true
provider::utils::cidrcontains("10.0.0.0/8", "192.168.0.0/16")  # false
provider::utils::cidrcontains("10.0.0.0/8", "10.1.2.3/32")     # true

cidroverlaps(prefix_a, prefix_b)

Returns true if two CIDR prefixes have any addresses in common.

provider::utils::cidroverlaps("10.0.0.0/8", "10.1.0.0/16")     # true
provider::utils::cidroverlaps("10.0.0.0/8", "192.168.0.0/16")  # false

cidrnoverlap(prefixes)

Returns true if no pair of CIDR prefixes in the list overlaps with each other.

provider::utils::cidrnoverlap(["10.0.0.0/8", "192.168.0.0/16", "172.16.0.0/12"])  # true
provider::utils::cidrnoverlap(["10.0.0.0/8", "10.1.0.0/16", "192.168.0.0/16"])    # false

All functions:

• Require CIDR notation for all arguments (use /32 or /128 for single hosts)
• Support both IPv4 and IPv6
• Return an error if address families are mixed

Requirements

• Terraform >= 1.8
• Go >= 1.24

Building the Provider

go install

Developing the Provider

To generate documentation:

make generate

To run tests:

make testacc