private static IntPtr GenerateIpForwardEntry(uint destIPAddress, uint destMask, uint nextHopIPAddress,
uint ifIndex,
int metric, uint policy, uint type, uint proto)
{
MIB_IPFORWARDROW row = new MIB_IPFORWARDROW {
dwForwardDest = destIPAddress,
dwForwardMask = destMask,
dwForwardPolicy = policy,
dwForwardNextHop = nextHopIPAddress,
dwForwardIfIndex = ifIndex,
dwForwardType = type,
dwForwardProto = proto,
dwForwardAge = 0,
dwForwardNextHopAS = 0,
dwForwardMetric1 = metric,
dwForwardMetric2 = 0,
dwForwardMetric3 = 0,
dwForwardMetric4 = 0,
dwForwardMetric5 = 0
};
var ptr = Marshal.AllocHGlobal(Marshal.SizeOf <MIB_IPFORWARDROW>());
Marshal.StructureToPtr(row, ptr, false);
return(ptr);
}
/// <summary>
/// Modifie une route existante.
/// </summary>
/// <param name="entryToSet">Route à modifier.</param>
/// <param name="IPInterface">Nouvelle interface.</param>
/// <param name="IPDestination">Nouvelle IP de destination.</param>
/// <param name="Mask">Nouveau masque.</param>
/// <param name="Protocol">Protocol de routage.</param>
/// <param name="NextHopAddr">Nouvelle adresse du prochain saut.</param>
/// <returns>0 si réussi.</returns>
public int ChangeRouteEntry(ref RouteEntry entryToSet, int IPInterface, IPAddress IPDestination,
IPAddress Mask, ForwardProtocol Protocol, IPAddress NextHopAddr, int metric)
{
int ret = -1;
try
{
MIB_IPFORWARDROW ipFwdSet = entryToSet._ipFwdNative;
ipFwdSet.dwForwardIfIndex = IPInterface;
ipFwdSet.dwForwardDest = (uint)BitConverter.ToInt32(IPDestination.GetAddressBytes(), 0);
ipFwdSet.dwForwardMask = (uint)BitConverter.ToInt32(Mask.GetAddressBytes(), 0);
ipFwdSet.dwForwardProto = Protocol;
ipFwdSet.dwForwardNextHop = (uint)BitConverter.ToInt32(NextHopAddr.GetAddressBytes(), 0);
//ipFwdSet.dwForwardMetric1 = metric;
//Appel api pour modifier la route.
ret = NativeMethods.SetIpForwardEntry(ref ipFwdSet);
if (ret == 0)
{
entryToSet.Index = IPInterface;
entryToSet.Destination = IPDestination;
entryToSet.Mask = Mask;
entryToSet.Protocol = Protocol;
entryToSet.NextHop = NextHopAddr;
entryToSet.Metric1 = metric;
}
}
catch (Exception)
{
}
return(ret);
}
public static void DeleteRoute(IPAddress ipAddress, IPAddress mask, IPAddress gateway, int gatewayIndex)
{
if (gateway != null)
{
var route = new MIB_IPFORWARDROW
{
dwForwardDest = BitConverter.ToUInt32(ipAddress.GetAddressBytes(), 0),
dwForwardMask = BitConverter.ToUInt32(mask.GetAddressBytes(), 0),
dwForwardNextHop = BitConverter.ToUInt32(gateway.GetAddressBytes(), 0),
dwForwardNextHopAS = 0,
dwForwardPolicy = 0,
dwForwardMetric1 = 9999,
dwForwardType = ForwardType.Indirect,
dwForwardProto = ForwardProtocol.NetMGMT,
dwForwardAge = 0,
dwForwardIfIndex = gatewayIndex,
dwForwardMetric2 = -1,
dwForwardMetric3 = -1,
dwForwardMetric4 = -1,
dwForwardMetric5 = -1
};
int output = DeleteIpForwardEntry(ref route);
}
}
public static WinApiRouteManagementResult DeleteRoute(string destinationIpAddress, string mask, string gatewayIpAddress)
{
WinApiRouteManagementResult result;
uint destinationIpAddressWinApiFormat = ParseInternetAddress(destinationIpAddress);
uint interfaceIndex;
if (GetBestInterface(destinationIpAddressWinApiFormat, out interfaceIndex) == NO_ERROR)
{
MIB_IPFORWARDROW route = new MIB_IPFORWARDROW
{
dwForwardProto = ForwardProtocol.NetMGMT,
dwForwardDest = destinationIpAddressWinApiFormat,
dwForwardMask = ParseInternetAddress(mask),
dwForwardNextHop = ParseInternetAddress(gatewayIpAddress),
dwForwardIfIndex = interfaceIndex
};
result = (WinApiRouteManagementResult)DeleteIpForwardEntry(ref route);
}
else
{
result = WinApiRouteManagementResult.ErrorCouldNotFindNetworkInterface;
}
return(result);
}
public static int deleteIpForwardEntry(UInt32 destIPAddress, UInt32 destMask, UInt32 nextHopIPAddress, UInt32 ifIndex)
{
MIB_IPFORWARDROW mifr = new MIB_IPFORWARDROW();
mifr.dwForwardDest = destIPAddress;
mifr.dwForwardMask = destMask;
mifr.dwForwardNextHop = nextHopIPAddress;
mifr.dwForwardIfIndex = ifIndex;
mifr.dwForwardPolicy = Convert.ToUInt32(0);
mifr.dwForwardType = Convert.ToUInt32(4);
mifr.dwForwardProto = Convert.ToUInt32(3);
mifr.dwForwardAge = Convert.ToUInt32(0);
mifr.dwForwardNextHopAS = Convert.ToUInt32(0);
mifr.dwForwardMetric1 = -1;
mifr.dwForwardMetric2 = -1;
mifr.dwForwardMetric3 = -1;
mifr.dwForwardMetric4 = -1;
mifr.dwForwardMetric5 = -1;
return(DeleteIpForwardEntry(ref mifr));
}
/// <summary>
/// Liste les routes de la table de routage.
/// </summary>
/// <returns></returns>
public List <RouteEntry> GetRoutesTable()
{
List <RouteEntry> forwardEntries = new List <RouteEntry>();
IntPtr pTable = IntPtr.Zero;
int iBufLen = 0;
int iRet = 0;
//1ier appel pour déterminer la taille de la table de routage.
iRet = NativeMethods.GetIpForwardTable(IntPtr.Zero, ref iBufLen, true);
try
{
pTable = Marshal.AllocHGlobal(iBufLen);
//Lecture de la table.
iRet = NativeMethods.GetIpForwardTable(pTable, ref iBufLen, true);
//Retour OK.
if (iRet == 0)
{
//Nombre d'entrées dans la table.
int iEntries = Marshal.ReadInt32(pTable);
//Pointeur sur 1ière entrée.
IntPtr pEntry = new IntPtr(pTable.ToInt32() + 4);
for (int i = 0; i < iEntries; i++)
{
//Lit la ligne de la table de routage.
MIB_IPFORWARDROW entry = (MIB_IPFORWARDROW)Marshal.PtrToStructure(pEntry, typeof(MIB_IPFORWARDROW));
RouteEntry rteEntry = new RouteEntry(
entry.dwForwardDest, entry.dwForwardMask, entry.dwForwardPolicy, entry.dwForwardNextHop,
_adapters.GetAdapter(entry.dwForwardIfIndex), entry.dwForwardType, entry.dwForwardProto,
entry.dwForwardAge, entry.dwForwardNextHopAS, entry.dwForwardMetric1, entry.dwForwardMetric2,
entry.dwForwardMetric3, entry.dwForwardMetric4, entry.dwForwardMetric5, entry.dwForwardIfIndex);
rteEntry._ipFwdNative = entry;
//Extrait les infos.
forwardEntries.Add(rteEntry);
//Pointeur sur entrée suivante.
pEntry = new IntPtr(pEntry.ToInt32() + Marshal.SizeOf(typeof(MIB_IPFORWARDROW)));
}
}
}
catch (Exception)
{
}
finally
{
Marshal.FreeHGlobal(pTable);
}
return(forwardEntries);
}
/// <summary>Creates or deletes a route in the local computer's IPv4 routing table.</summary>
/// <param name="add"></param>
/// <param name="destination"></param>
/// <param name="mask"></param>
/// <param name="gateway"></param>
/// <param name="index"></param>
/// <param name="metric"></param>
/// <param name="message"></param>
/// <returns></returns>
public static bool ModifyIpForwardEntry(bool add, string destination, string mask, string gateway, uint index, uint metric, out string message)
{
var route = new MIB_IPFORWARDROW();
if (index == 0)
{
message = "Network interface index not found.";
return(false);
}
if (metric == 1)
{
message = "Metric value not found.";
return(false);
}
route.dwForwardDest = GetIPFromString(destination);
route.dwForwardMask = GetIPFromString(mask);
route.dwForwardNextHop = GetIPFromString(gateway);
route.dwForwardIfIndex = index;
route.dwForwardMetric1 = metric;
route.dwForwardProto = ForwardProtocol.NetMGMT;
int result = add ? CreateIpForwardEntry(ref route) : DeleteIpForwardEntry(ref route);
message = string.Empty;
if (result == ERROR_SUCCESS)
{
return(true);
}
if (result == ERROR_INVALID_PARAMETER)
{
route.dwForwardNextHop = 0;
result = add ? CreateIpForwardEntry(ref route) : DeleteIpForwardEntry(ref route);
}
if (result == ERROR_SUCCESS)
{
return(true);
}
if (result == ERROR_OBJECT_ALREADY_EXISTS)
{
message = "Route already exist.";
return(true);
}
if (result == ERROR_NOT_FOUND)
{
message = "Cannot delete or modify a route that does not exist.";
return(true);
}
message = new System.ComponentModel.Win32Exception(result).Message;
return(false);
}
public static IPForwardTable ReadIPForwardTable(IntPtr tablePtr)
{
var result = (IPForwardTable)Marshal.PtrToStructure(tablePtr, typeof(IPForwardTable));
MIB_IPFORWARDROW[] table = new MIB_IPFORWARDROW[result.Size];
IntPtr p = new IntPtr(tablePtr.ToInt64() + Marshal.SizeOf(result.Size));
for (int i = 0; i < result.Size; ++i)
{
table[i] = (MIB_IPFORWARDROW)Marshal.PtrToStructure(p, typeof(MIB_IPFORWARDROW));
p = new IntPtr(p.ToInt64() + Marshal.SizeOf(typeof(MIB_IPFORWARDROW)));
}
result.Table = table;
return(result);
}
private int CreateIpForwardEntry(string nextHopIPAddress, int ifIndex, int matric, string Mask)
{
MIB_IPFORWARDROW mifr = new MIB_IPFORWARDROW();
mifr.dwForwardDest = BitConverter.ToUInt32(IPAddress.Parse(AppConfiguration.ZERO_IP_KEY).GetAddressBytes(), 0);
mifr.dwForwardMask = BitConverter.ToUInt32(IPAddress.Parse(Mask).GetAddressBytes(), 0);
mifr.dwForwardPolicy = Convert.ToUInt32(0);
mifr.dwForwardNextHop = BitConverter.ToUInt32(IPAddress.Parse(nextHopIPAddress).GetAddressBytes(), 0);
mifr.dwForwardIfIndex = Convert.ToUInt32(ifIndex);
mifr.dwForwardType = Convert.ToUInt32(4);
mifr.dwForwardProto = Convert.ToUInt32(3);
mifr.dwForwardAge = Convert.ToUInt32(0);
mifr.dwForwardNextHopAS = Convert.ToUInt32(0);
mifr.dwForwardMetric1 = Convert.ToUInt32(matric);
mifr.dwForwardMetric2 = Convert.ToUInt32(matric);
mifr.dwForwardMetric3 = Convert.ToUInt32(matric);
mifr.dwForwardMetric4 = Convert.ToUInt32(matric);
mifr.dwForwardMetric5 = Convert.ToUInt32(matric);
return(CreateIpForwardEntry(ref mifr));
}
public static MIB_IPFORWARDROW[] GetCurrentForwardTable()
{
var fwdTable = IntPtr.Zero;
var size = 0;
var result = GetIpForwardTable(fwdTable, ref size, true);
fwdTable = Marshal.AllocHGlobal(size);
result = GetIpForwardTable(fwdTable, ref size, true);
var fib = Marshal.PtrToStructure <MIB_IPFORWARDTABLE>(fwdTable);
var rows = new MIB_IPFORWARDROW[fib.dwNumEntries];
var p = fwdTable + Marshal.SizeOf(fib.dwNumEntries);
for (var i = 0; i < fib.dwNumEntries; i++)
{
rows[i] = Marshal.PtrToStructure <MIB_IPFORWARDROW>(p);
p += Marshal.SizeOf <MIB_IPFORWARDROW>();
}
Marshal.FreeHGlobal(fwdTable);
return(rows);
}
public void CreateSetDeleteIpForwardEntryTest()
{
Assert.That(() =>
{
MIB_IPFORWARDROW row = default;
foreach (var rrow in GetIpForwardTable(true).Where(r => r.dwForwardDest == 0))
{
if (row.dwForwardType == 0)
{
row = rrow;
}
DeleteIpForwardEntry(rrow).ThrowIfFailed();
}
row.dwForwardNextHop = 0xDDBBCCAA;
CreateIpForwardEntry(row).ThrowIfFailed();
//row.dwForwardProto = MIB_IPFORWARD_PROTO.MIB_IPPROTO_DHCP;
SetIpForwardEntry(row).ThrowIfFailed();
DeleteIpForwardEntry(row).ThrowIfFailed();
}, Throws.Nothing);
}
private static extern int GetBestRoute(uint dwDestAddr, uint dwSourceAddr, out MIB_IPFORWARDROW pBestRoute);
private static extern int SetIpForwardEntry(MIB_IPFORWARDROW pRoute);
/// <summary>
/// XP - IPv4 only
/// </summary>
/// <param name="destination"></param>
/// <param name="prefix"></param>
/// <param name="gateway"></param>
/// <param name="interfaceIndex"></param>
public static void DeleteRoute(string destination, string prefix, string gateway, string interfaceIndex)
{
if (Environment.OSVersion.Version.CompareTo(new Version("6.0")) < 0)
{
MIB_IPFORWARDROW route = new MIB_IPFORWARDROW();
route.dwForwardDest = BitConverter.ToUInt32(IPAddress.Parse(destination).GetAddressBytes().ToArray(), 0);
route.dwForwardMask = BitConverter.ToUInt32(IPAddress.Parse(prefix).GetAddressBytes().ToArray(), 0);
route.dwForwardNextHop = BitConverter.ToUInt32(IPAddress.Parse(gateway).GetAddressBytes().ToArray(), 0);
route.dwForwardIfIndex = uint.Parse(interfaceIndex);
route.dwForwardProto = NL_ROUTE_PROTOCOL.MIB_IPPROTO_NETMGMT;
IntPtr pRoute = Marshal.AllocHGlobal(Marshal.SizeOf(route));
Marshal.StructureToPtr(route, pRoute, false);
DeleteIpForwardEntry(pRoute);
Marshal.DestroyStructure(pRoute, typeof(MIB_IPFORWARDROW));
Marshal.FreeHGlobal(pRoute);
}
else
{
MIB_IPFORWARD_ROW2 route2 = new MIB_IPFORWARD_ROW2();
uint prefixLength = 0;
if (IPAddress.Parse(destination).AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
SOCKADDR_IN address = new SOCKADDR_IN();
address.sin_family = FAMILY.AF_INET;
address.sin_addr.S_addr = BitConverter.ToUInt32(IPAddress.Parse(destination).GetAddressBytes().ToArray(), 0);
route2.DestinationPrefix.Prefix.Ipv4 = address;
uint ipMask = BitConverter.ToUInt32(IPAddress.Parse(prefix).GetAddressBytes().Reverse().ToArray(), 0);
while (ipMask > 0)
{
prefixLength++;
ipMask <<= 1;
}
address.sin_addr.S_addr = BitConverter.ToUInt32(IPAddress.Parse(gateway).GetAddressBytes().ToArray(), 0);
route2.NextHop.Ipv4 = address;
}
else
{
SOCKADDR_IN6 address = new SOCKADDR_IN6();
address.sin6_family = FAMILY.AF_INET6;
address.sin6_addr.Byte = IPAddress.Parse(destination).GetAddressBytes().ToArray();
route2.DestinationPrefix.Prefix.Ipv6 = address;
prefixLength = uint.Parse(prefix);
address.sin6_addr.Byte = IPAddress.Parse(gateway).GetAddressBytes().ToArray();
route2.NextHop.Ipv6 = address;
}
route2.DestinationPrefix.PrefixLength = prefixLength;
route2.InterfaceIndex = uint.Parse(interfaceIndex);
IntPtr pRoute = Marshal.AllocHGlobal(Marshal.SizeOf(route2));
Marshal.StructureToPtr(route2, pRoute, false);
DeleteIpForwardEntry2(pRoute);
Marshal.DestroyStructure(pRoute, typeof(MIB_IPFORWARD_ROW2));
Marshal.FreeHGlobal(pRoute);
}
}
private static extern int DeleteIpForwardEntry(ref MIB_IPFORWARDROW pRoute);
static extern int CreateIpForwardEntry(ref MIB_IPFORWARDROW pRoute);
public static extern int GetBestRoute(uint dwDestAddr, int dwSourceAddr, out MIB_IPFORWARDROW pRoute);
// Searches the system's routing table for the best route to the
// specified IP address *that does not route through the TAP device*.
//
// That last requirement - ignoring the TAP device - is what prevents us
// from simply calling GetBestRoute: other than that, it does all the
// work of finding the lowest-weighted gateway to the destination IP.
//
// NOTE: This function does not *always* find the best gateway: it
// currently only considers "default" gateways (0.0.0.0) which may not
// work in some rare cases. Several re-implementations of the Windows
// API illustrate how we could more closely match GetBestRoute:
// - https://github.com/wine-mirror/wine/blob/master/dlls/iphlpapi/iphlpapi_main.c
// - https://github.com/reactos/reactos/blob/master/dll/win32/iphlpapi/iphlpapi_main.c
private void GetSystemIpv4Gateway(string proxyIp)
{
gatewayIp = null;
gatewayInterfaceIndex = -1;
int tapInterfaceIndex;
try
{
tapInterfaceIndex = NetworkInterface.GetAllNetworkInterfaces()
.Where(i => i.Name == TAP_DEVICE_NAME)
.FirstOrDefault()
.GetIPProperties()
.GetIPv4Properties().Index;
}
catch (Exception)
{
throw new Exception("TAP device not found");
}
// Some marshalling craziness follows: we have to first ask
// GetIpForwardTable how much memory is required to hold the routing
// table before calling it again to actually return us the table;
// once we have the table, we have to iterate over the rows
// (thankfully, MIB_IPFORWARDROW marshalls easily).
int bufferSize = 0;
if (GetIpForwardTable(IntPtr.Zero, ref bufferSize, true) != ERROR_INSUFFICIENT_BUFFER)
{
throw new Exception("could not fetch routing table");
}
var buffer = Marshal.AllocHGlobal(bufferSize);
if (GetIpForwardTable(buffer, ref bufferSize, true) != 0)
{
Marshal.FreeHGlobal(buffer);
throw new Exception("could not fetch routing table");
}
// NOTE: We deliberately *do not marshal the entire
// MIB_IPFORWARDTABLE* owing to unexplained crashes following
// suspend/resume. Fortunately, since that structure is
// logically just a DWORD followed by an array, this entails
// little extra work.
var numEntries = Marshal.ReadInt32(buffer);
MIB_IPFORWARDROW bestRow = null;
var rowPtr = buffer + Marshal.SizeOf(numEntries);
for (int i = 0; i < numEntries; i++)
{
MIB_IPFORWARDROW row = (MIB_IPFORWARDROW)Marshal.PtrToStructure(rowPtr, typeof(MIB_IPFORWARDROW));
// Must be a gateway (see note above on how we can improve this).
if (row.dwForwardDest != 0)
{
continue;
}
// Must not be the TAP device.
if (row.dwForwardIfIndex == tapInterfaceIndex)
{
continue;
}
if (bestRow == null || row.dwForwardMetric1 < bestRow.dwForwardMetric1)
{
bestRow = row;
}
rowPtr += Marshal.SizeOf(typeof(MIB_IPFORWARDROW));
}
Marshal.FreeHGlobal(buffer);
if (bestRow == null)
{
throw new Exception("no gateway found");
}
gatewayIp = new IPAddress(BitConverter.GetBytes(bestRow.dwForwardNextHop)).ToString();
gatewayInterfaceIndex = bestRow.dwForwardIfIndex;
}
public DataTable GetRoutesTableInTable()
{
List <RouteEntry> forwardEntries = new List <RouteEntry>();
DataTable tmp = new DataTable();
tmp.Columns.Add("DestIP", System.Type.GetType("System.String"));
tmp.Columns.Add("SubnetMask", System.Type.GetType("System.String"));
tmp.Columns.Add("NextHop", System.Type.GetType("System.String"));
tmp.Columns.Add("IfIndex", System.Type.GetType("System.Int32"));
tmp.Columns.Add("Type", System.Type.GetType("System.Int32"));
tmp.Columns.Add("TypeText", System.Type.GetType("System.String"));
tmp.Columns.Add("Proto", System.Type.GetType("System.Int32"));
tmp.Columns.Add("ProtoText", System.Type.GetType("System.String"));
tmp.Columns.Add("Age", System.Type.GetType("System.Int32"));
tmp.Columns.Add("Metric1", System.Type.GetType("System.Int32"));
tmp.Columns.Add("Type_Text", System.Type.GetType("System.Int32"));
tmp.Columns.Add("IFText", System.Type.GetType("System.String"));
tmp.Columns.Add("AgeText", System.Type.GetType("System.String"));
IntPtr pTable = IntPtr.Zero;
int iBufLen = 0;
int iRet = 0;
iRet = NativeMethods.GetIpForwardTable(IntPtr.Zero, ref iBufLen, true);
try
{
pTable = Marshal.AllocHGlobal(iBufLen);
iRet = NativeMethods.GetIpForwardTable(pTable, ref iBufLen, true);
if (iRet == 0)
{
int iEntries = Marshal.ReadInt32(pTable);
IntPtr pEntry = new IntPtr(pTable.ToInt32() + 4);
for (int i = 0; i < iEntries; i++)
{
MIB_IPFORWARDROW entry = (MIB_IPFORWARDROW)Marshal.PtrToStructure(pEntry, typeof(MIB_IPFORWARDROW));
RouteEntry rteEntry = new RouteEntry(
entry.dwForwardDest, entry.dwForwardMask, entry.dwForwardPolicy, entry.dwForwardNextHop,
_adapters.GetAdapter(entry.dwForwardIfIndex), entry.dwForwardType, entry.dwForwardProto,
entry.dwForwardAge, entry.dwForwardNextHopAS, entry.dwForwardMetric1, entry.dwForwardMetric2,
entry.dwForwardMetric3, entry.dwForwardMetric4, entry.dwForwardMetric5, entry.dwForwardIfIndex);
tmp.Rows.Add();
tmp.Rows[tmp.Rows.Count - 1][0] = rteEntry.Destination;
tmp.Rows[tmp.Rows.Count - 1][1] = rteEntry.Mask;
tmp.Rows[tmp.Rows.Count - 1][2] = rteEntry.NextHop;
tmp.Rows[tmp.Rows.Count - 1][3] = entry.dwForwardIfIndex;
tmp.Rows[tmp.Rows.Count - 1][4] = rteEntry.ForwardType;
tmp.Rows[tmp.Rows.Count - 1][5] = rteEntry.ForwardType;
tmp.Rows[tmp.Rows.Count - 1][6] = rteEntry.Protocol;
tmp.Rows[tmp.Rows.Count - 1][7] = rteEntry.Protocol;
tmp.Rows[tmp.Rows.Count - 1][8] = rteEntry.Age;
tmp.Rows[tmp.Rows.Count - 1][9] = rteEntry.Metric1;
pEntry = new IntPtr(pEntry.ToInt32() + Marshal.SizeOf(typeof(MIB_IPFORWARDROW)));
}
}
}
catch (Exception)
{
}
finally
{
Marshal.FreeHGlobal(pTable);
}
return(tmp);
}
public extern static int SetIpForwardEntry(ref MIB_IPFORWARDROW pRoute);
internal extern static Int32 GetBestRoute(
UInt32 dwDestAddr,
UInt32 dwSourceAddr,
out MIB_IPFORWARDROW pBestRoute);
public extern static int GetBestRoute(uint dwDestAddr, int dwSourceAddr, out MIB_IPFORWARDROW pRoute); //dwSourceAddr = 0 for the caller