mediocre-go-lib/mnet/mnet.go
2018-08-09 12:34:09 -06:00

68 lines
2.3 KiB
Go

// Package mnet extends the standard package with extra functionality which is
// commonly useful
package mnet
import (
"net"
)
func mustGetCIDRNetwork(cidr string) *net.IPNet {
_, n, err := net.ParseCIDR(cidr)
if err != nil {
panic(err)
}
return n
}
// https://en.wikipedia.org/wiki/Reserved_IP_addresses
var reservedCIDRs4 = []*net.IPNet{
mustGetCIDRNetwork("0.0.0.0/8"), // current network
mustGetCIDRNetwork("10.0.0.0/8"), // private network
mustGetCIDRNetwork("100.64.0.0/10"), // private network
mustGetCIDRNetwork("127.0.0.0/8"), // localhost
mustGetCIDRNetwork("169.254.0.0/16"), // link-local
mustGetCIDRNetwork("172.16.0.0/12"), // private network
mustGetCIDRNetwork("192.0.0.0/24"), // IETF protocol assignments
mustGetCIDRNetwork("192.0.2.0/24"), // documentation and examples
mustGetCIDRNetwork("192.88.99.0/24"), // 6to4 Relay
mustGetCIDRNetwork("192.168.0.0/16"), // private network
mustGetCIDRNetwork("198.18.0.0/15"), // private network
mustGetCIDRNetwork("198.51.100.0/24"), // documentation and examples
mustGetCIDRNetwork("203.0.113.0/24"), // documentation and examples
mustGetCIDRNetwork("224.0.0.0/4"), // IP multicast
mustGetCIDRNetwork("240.0.0.0/4"), // reserved
mustGetCIDRNetwork("255.255.255.255/32"), // limited broadcast address
}
var reservedCIDRs6 = []*net.IPNet{
mustGetCIDRNetwork("::/128"), // unspecified address
mustGetCIDRNetwork("::1/128"), // loopback address
mustGetCIDRNetwork("100::/64"), // discard prefix
mustGetCIDRNetwork("2001::/32"), // Teredo tunneling
mustGetCIDRNetwork("2001:20::/28"), // ORCHID v2
mustGetCIDRNetwork("2001:db8::/32"), // documentation and examples
mustGetCIDRNetwork("2002::/16"), // 6to4 addressing
mustGetCIDRNetwork("fc00::/7"), // unique local
mustGetCIDRNetwork("fe80::/10"), // link local
mustGetCIDRNetwork("ff00::/8"), // multicast
}
// IsReservedIP returns true if the given valid IP is part of a reserved IP
// range.
func IsReservedIP(ip net.IP) bool {
containedBy := func(cidrs []*net.IPNet) bool {
for _, cidr := range cidrs {
if cidr.Contains(ip) {
return true
}
}
return false
}
if ip.To4() != nil {
return containedBy(reservedCIDRs4)
}
return containedBy(reservedCIDRs6)
}