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package cidr
import (
"fmt"
"net"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
// NetmaskFunc is a function that converts an IPv4 address prefix given in CIDR
// notation into a subnet mask address.
var NetmaskFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "prefix",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
_, network, err := net.ParseCIDR(args[0].AsString())
if err != nil {
return cty.UnknownVal(cty.String), fmt.Errorf("invalid CIDR expression: %s", err)
}
return cty.StringVal(net.IP(network.Mask).String()), nil
},
})
// Netmask converts an IPv4 address prefix given in CIDR notation into a subnet mask address.
func Netmask(prefix cty.Value) (cty.Value, error) {
return NetmaskFunc.Call([]cty.Value{prefix})
}
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