mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-15 02:01:25 +00:00
ad0f7a5305
Upgrade to Go 1.20.5, Hydra v2 SDK, rules-go v0.44.2 (with proper resolves), protobuf v25.3 and mass upgrade of Go dependencies.
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package net
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"math/big"
|
|
"net"
|
|
"strconv"
|
|
)
|
|
|
|
// ParseCIDRs parses a list of cidrs and return error if any is invalid.
|
|
// order is maintained
|
|
func ParseCIDRs(cidrsString []string) ([]*net.IPNet, error) {
|
|
cidrs := make([]*net.IPNet, 0, len(cidrsString))
|
|
for i, cidrString := range cidrsString {
|
|
_, cidr, err := ParseCIDRSloppy(cidrString)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("invalid CIDR[%d]: %v (%v)", i, cidr, err)
|
|
}
|
|
cidrs = append(cidrs, cidr)
|
|
}
|
|
return cidrs, nil
|
|
}
|
|
|
|
// ParsePort parses a string representing an IP port. If the string is not a
|
|
// valid port number, this returns an error.
|
|
func ParsePort(port string, allowZero bool) (int, error) {
|
|
portInt, err := strconv.ParseUint(port, 10, 16)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
if portInt == 0 && !allowZero {
|
|
return 0, errors.New("0 is not a valid port number")
|
|
}
|
|
return int(portInt), nil
|
|
}
|
|
|
|
// BigForIP creates a big.Int based on the provided net.IP
|
|
func BigForIP(ip net.IP) *big.Int {
|
|
// NOTE: Convert to 16-byte representation so we can
|
|
// handle v4 and v6 values the same way.
|
|
return big.NewInt(0).SetBytes(ip.To16())
|
|
}
|
|
|
|
// AddIPOffset adds the provided integer offset to a base big.Int representing a net.IP
|
|
// NOTE: If you started with a v4 address and overflow it, you get a v6 result.
|
|
func AddIPOffset(base *big.Int, offset int) net.IP {
|
|
r := big.NewInt(0).Add(base, big.NewInt(int64(offset))).Bytes()
|
|
r = append(make([]byte, 16), r...)
|
|
return net.IP(r[len(r)-16:])
|
|
}
|
|
|
|
// RangeSize returns the size of a range in valid addresses.
|
|
// returns the size of the subnet (or math.MaxInt64 if the range size would overflow int64)
|
|
func RangeSize(subnet *net.IPNet) int64 {
|
|
ones, bits := subnet.Mask.Size()
|
|
if bits == 32 && (bits-ones) >= 31 || bits == 128 && (bits-ones) >= 127 {
|
|
return 0
|
|
}
|
|
// this checks that we are not overflowing an int64
|
|
if bits-ones >= 63 {
|
|
return math.MaxInt64
|
|
}
|
|
return int64(1) << uint(bits-ones)
|
|
}
|
|
|
|
// GetIndexedIP returns a net.IP that is subnet.IP + index in the contiguous IP space.
|
|
func GetIndexedIP(subnet *net.IPNet, index int) (net.IP, error) {
|
|
ip := AddIPOffset(BigForIP(subnet.IP), index)
|
|
if !subnet.Contains(ip) {
|
|
return nil, fmt.Errorf("can't generate IP with index %d from subnet. subnet too small. subnet: %q", index, subnet)
|
|
}
|
|
return ip, nil
|
|
}
|