mnet: implement IsReservedIP
This commit is contained in:
parent
bc97c948bf
commit
dcf9f73bcb
67
mnet/mnet.go
Normal file
67
mnet/mnet.go
Normal file
@ -0,0 +1,67 @@
|
||||
// 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)
|
||||
}
|
33
mnet/mnet_test.go
Normal file
33
mnet/mnet_test.go
Normal file
@ -0,0 +1,33 @@
|
||||
package mnet
|
||||
|
||||
import (
|
||||
"net"
|
||||
. "testing"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mtest/massert"
|
||||
)
|
||||
|
||||
func TestIsReservedIP(t *T) {
|
||||
assertReserved := func(ipStr string) massert.Assertion {
|
||||
ip := net.ParseIP(ipStr)
|
||||
if ip == nil {
|
||||
panic("ip:" + ipStr + " not valid")
|
||||
}
|
||||
return massert.Comment(massert.Equal(true, IsReservedIP(ip)),
|
||||
"ip:%q", ipStr)
|
||||
}
|
||||
|
||||
massert.Fatal(t, massert.All(
|
||||
assertReserved("127.0.0.1"),
|
||||
assertReserved("::ffff:127.0.0.1"),
|
||||
assertReserved("192.168.40.50"),
|
||||
assertReserved("::1"),
|
||||
assertReserved("100::1"),
|
||||
))
|
||||
|
||||
massert.Fatal(t, massert.None(
|
||||
assertReserved("8.8.8.8"),
|
||||
assertReserved("::ffff:8.8.8.8"),
|
||||
assertReserved("2600:1700:7580:6e80:21c:25ff:fe97:44df"),
|
||||
))
|
||||
}
|
Loading…
Reference in New Issue
Block a user