From ce64885a66bede5896ee2d7be12efd7ab69bd51a Mon Sep 17 00:00:00 2001
From: Toad King <toadking@toadking.com>
Date: Thu, 15 May 2014 20:33:21 -0400
Subject: [PATCH] make IOCTL_SO_GETHOSTID more accurate on Windows

---
 .../Core/IPC_HLE/WII_IPC_HLE_Device_net.cpp   | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.cpp b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.cpp
index 6204248546..e3d6d31811 100644
--- a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.cpp
+++ b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.cpp
@@ -854,7 +854,55 @@ bool CWII_IPC_HLE_Device_net_ip_top::IOCtl(u32 _CommandAddress)
 		INFO_LOG(WII_IPC_NET, "IOCTL_SO_GETHOSTID "
 			"(BufferIn: (%08x, %i), BufferOut: (%08x, %i)",
 			BufferIn, BufferInSize, BufferOut, BufferOutSize);
+		// default placeholder, in case of failure
 		ReturnValue = 192 << 24 | 168 << 16 | 1 << 8 | 150;
+
+#ifdef _WIN32
+		DWORD forwardTableSize, ipTableSize;
+		PMIB_IPFORWARDTABLE forwardTable = (PMIB_IPFORWARDTABLE)malloc(sizeof(MIB_IPFORWARDTABLE));
+		PMIB_IPADDRTABLE ipTable = (PMIB_IPADDRTABLE)malloc(sizeof(MIB_IPADDRTABLE));
+		
+		forwardTableSize = sizeof(MIB_IPFORWARDTABLE);
+		if (GetIpForwardTable(forwardTable, &forwardTableSize, 0) == ERROR_INSUFFICIENT_BUFFER)
+		{
+			free(forwardTable);
+			forwardTable = (PMIB_IPFORWARDTABLE)malloc(forwardTableSize);
+		}
+
+		ipTableSize = sizeof(MIB_IPADDRTABLE);
+		if (GetIpAddrTable(ipTable, &ipTableSize, 0) == ERROR_INSUFFICIENT_BUFFER)
+		{
+			free(ipTable);
+			ipTable = (PMIB_IPADDRTABLE)malloc(ipTableSize);
+		}
+
+		// find the interface IP used for the default route and use that
+		if (!GetIpForwardTable(forwardTable, &forwardTableSize, 0) && !GetIpAddrTable(ipTable, &ipTableSize, 0))
+		{
+			for (DWORD i = 0; i < forwardTable->dwNumEntries; i++)
+			{
+				MIB_IPFORWARDROW forwardRow = forwardTable->table[i];
+				if (forwardRow.dwForwardDest == 0)
+				{
+					for (DWORD j = 0; j < ipTable->dwNumEntries; j++)
+					{
+						MIB_IPADDRROW ipRow = ipTable->table[j];
+						if (ipRow.dwIndex == forwardRow.dwForwardIfIndex)
+						{
+							ReturnValue = Common::swap32(ipRow.dwAddr);
+							break;
+						}
+					}
+
+					break;
+				}
+			}
+		}
+
+		free(forwardTable);
+		free(ipTable);
+#endif
+
 		break;
 	}