This Commented CUE
demonstrates how to use the built-in function
net.IPCIDR
to check that values represent valid IPv4 or IPv6 addresses or subnets in
CIDR notation.
file.cue
package example
import "net"
// All top-level fields must represent valid CIDR ranges.
[_]: net.IPCIDR
// Some valid CIDR ranges.
v4Block: "198.51.100.0/22"
v4Address: "198.51.100.14/24"
v6Block: "2001:db8::/48"
v6Address: "::1/128"
// Some invalid CIDR ranges.
v4SubnetMaskTooLarge: "10.0.0.0/50"
v6MalformedPrefix: ":::1/128"TERMINAL
$ cue vet
v4SubnetMaskTooLarge: invalid value "10.0.0.0/50" (does not satisfy net.IPCIDR): error in call to net.IPCIDR: netip.ParsePrefix("10.0.0.0/50"): prefix length out of range:
./file.cue:6:6
./file.cue:15:23
v6MalformedPrefix: invalid value ":::1/128" (does not satisfy net.IPCIDR): error in call to net.IPCIDR: netip.ParsePrefix(":::1/128"): ParseAddr(":::1"): each colon-separated field must have at least one digit (at ":1"):
./file.cue:6:6
./file.cue:16:23Related content
- The
netbuilt-in package - How-to Guide: Using "net.IP" to validate IP addresses
- How-to Guide: Using "net.IPv4" to validate IPv4 addresses