New: Improve IPAddress.IsLocal method

Closes #2032

(cherry picked from commit fd98a179ab6fed8037c99344b34593aac24a0ac0)
Co-Authored-By: ta264 <ta264@users.noreply.github.com>
pull/2151/head
Qstick 2 years ago
parent be8e50a41f
commit 13dad33e31

@ -1,4 +1,5 @@
using System.Net;
using System.Net.Sockets;
namespace NzbDrone.Common.Extensions
{
@ -6,24 +7,50 @@ namespace NzbDrone.Common.Extensions
{
public static bool IsLocalAddress(this IPAddress ipAddress)
{
if (ipAddress.ToString() == "::1")
// Map back to IPv4 if mapped to IPv6, for example "::ffff:1.2.3.4" to "1.2.3.4".
if (ipAddress.IsIPv4MappedToIPv6)
{
ipAddress = ipAddress.MapToIPv4();
}
// Checks loopback ranges for both IPv4 and IPv6.
if (IPAddress.IsLoopback(ipAddress))
{
return true;
}
byte[] bytes = ipAddress.GetAddressBytes();
switch (bytes[0])
// IPv4
if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
{
case 10:
case 127:
return true;
case 172:
return bytes[1] < 32 && bytes[1] >= 16;
case 192:
return bytes[1] == 168;
default:
return false;
return IsLocalIPv4(ipAddress.GetAddressBytes());
}
// IPv6
if (ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
return ipAddress.IsIPv6LinkLocal ||
ipAddress.IsIPv6UniqueLocal ||
ipAddress.IsIPv6SiteLocal;
}
return false;
}
private static bool IsLocalIPv4(byte[] ipv4Bytes)
{
// Link local (no IP assigned by DHCP): 169.254.0.0 to 169.254.255.255 (169.254.0.0/16)
bool IsLinkLocal() => ipv4Bytes[0] == 169 && ipv4Bytes[1] == 254;
// Class A private range: 10.0.0.0 10.255.255.255 (10.0.0.0/8)
bool IsClassA() => ipv4Bytes[0] == 10;
// Class B private range: 172.16.0.0 172.31.255.255 (172.16.0.0/12)
bool IsClassB() => ipv4Bytes[0] == 172 && ipv4Bytes[1] >= 16 && ipv4Bytes[1] <= 31;
// Class C private range: 192.168.0.0 192.168.255.255 (192.168.0.0/16)
bool IsClassC() => ipv4Bytes[0] == 192 && ipv4Bytes[1] == 168;
return IsLinkLocal() || IsClassA() || IsClassC() || IsClassB();
}
}
}

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