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Code Issues Releases Activity

New: Improve IPAddress.IsLocal method

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Co-Authored-By: ta264 <ta264@users.noreply.github.com>
This commit is contained in:
Qstick 2022-12-07 21:16:40 -06:00
parent 87795708b5
commit fd98a179ab
1 changed files with 32 additions and 16 deletions
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46
src/NzbDrone.Common/Extensions/IpAddressExtensions.cs
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@ -1,4 +1,4 @@
using System.Net;
using System.Net;
using System.Net.Sockets;
namespace NzbDrone.Common.Extensions
@ -7,34 +7,50 @@ public static class IPAddressExtensions
{
public static bool IsLocalAddress(this IPAddress ipAddress)
{
if (ipAddress.IsIPv6LinkLocal)
// Map back to IPv4 if mapped to IPv6, for example "::ffff:1.2.3.4" to "1.2.3.4".
if (ipAddress.IsIPv4MappedToIPv6)
{
return true;
ipAddress = ipAddress.MapToIPv4();
}
// Checks loopback ranges for both IPv4 and IPv6.
if (IPAddress.IsLoopback(ipAddress))
{
return true;
}
// IPv4
if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
{
byte[] bytes = ipAddress.GetAddressBytes();
switch (bytes[0])
{
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();
}
}
}