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Code Issues Releases Wiki Activity

Improves private IP address detection (#7657)

pull/7673/head
DHR60 2025-07-29 19:18:13 +08:00 committed by GitHub
parent 82f9698c0d
commit 74bb01d044
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GPG Key ID: B5690EEEBB952194
1 changed files with 37 additions and 6 deletions
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31
v2rayN/ServiceLib/Common/Utils.cs
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@ -390,7 +390,14 @@ public class Utils
{ {
if (IPAddress.TryParse(ip, out var address)) if (IPAddress.TryParse(ip, out var address))
{ {
// Loopback address check (127.0.0.1 for IPv4, ::1 for IPv6)
if (IPAddress.IsLoopback(address))
return true;
var ipBytes = address.GetAddressBytes(); var ipBytes = address.GetAddressBytes();
if (address.AddressFamily == AddressFamily.InterNetwork)
{
// IPv4 private address check
if (ipBytes[0] == 10) if (ipBytes[0] == 10)
return true; return true;
if (ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31) if (ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31)
@ -398,6 +405,30 @@ public class Utils
if (ipBytes[0] == 192 && ipBytes[1] == 168) if (ipBytes[0] == 192 && ipBytes[1] == 168)
return true; return true;
} }
else if (address.AddressFamily == AddressFamily.InterNetworkV6)
{
// IPv6 private address check
// Link-local address fe80::/10
if (ipBytes[0] == 0xfe && (ipBytes[1] & 0xc0) == 0x80)
return true;
// Unique local address fc00::/7 (typically fd00::/8)
if ((ipBytes[0] & 0xfe) == 0xfc)
return true;
// Private portion in IPv4-mapped addresses ::ffff:0:0/96
if (address.IsIPv4MappedToIPv6)
{
var ipv4Bytes = ipBytes.Skip(12).ToArray();
if (ipv4Bytes[0] == 10)
return true;
if (ipv4Bytes[0] == 172 && ipv4Bytes[1] >= 16 && ipv4Bytes[1] <= 31)
return true;
if (ipv4Bytes[0] == 192 && ipv4Bytes[1] == 168)
return true;
}
}
}
return false; return false;
} }