Changing Route Table from C#

C

cyberco

I've posted this question in
'microsoft.public.dotnet.framework.compactframework' as well, but
despite the great help I still haven't solved the problem. So before
going the C++ route I would like to see if anybody in this group may
have the answer.

What I'm trying to do is change the route table of my Windows Mobile 5
Pocket PC (.Net CF) device (TyTN) using C#. This is probably similar as
doing it on standard CF. Using Iphlpapi.dll I can retrieve the route
table, but I am unable to change/add a route. I have specified the
following structs/pinvokes:

=========START===========
[StructLayout(LayoutKind.Sequential)]
public struct MIB_IPFORWARDROW {
public UInt32 dwForwardDest; //destination IP address.
public UInt32 dwForwardMask; //Subnet mask
public UInt32 dwForwardPolicy; //conditions for multi-path
route. Unused, specify 0.
public UInt32 dwForwardNextHop; //IP address of the next hop.
Own address?
public UInt32 dwForwardIfIndex; //index of interface
public UInt32 dwForwardType; //route type
public UInt32 dwForwardProto; //routing protocol.
public UInt32 dwForwardAge; //age of route.
public UInt32 dwForwardNextHopAS; //autonomous system number. 0
if not relevant
public int dwForwardMetric1; //-1 if not used (goes for all
metrics)
public int dwForwardMetric2;
public int dwForwardMetric3;
public int dwForwardMetric4;
public int dwForwardMetric5;
}

[StructLayout(LayoutKind.Sequential)]
public struct MIB_IPFORWARDTABLE {
public int dwNumEntries; //number of route entries in
the table.
public MIB_IPFORWARDROW[] table;
}


[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int CreateIpForwardEntry(ref MIB_IPFORWARDROW
pRoute);

[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int DeleteIpForwardEntry(ref MIB_IPFORWARDROW
pRoute);

[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int SetIpForwardEntry(ref MIB_IPFORWARDROW
pRoute);

[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int GetIpForwardTable(byte[] pIpForwardTable, out
int pdwSize, bool bOrder);

=========END===========


I invoke these methods as follows:


=========START===========
public int createIpForwardEntry(UInt32 destIPAddress, UInt32 destMask,
UInt32 nextHopIPAddress,
UInt32 ifIndex) {
MIB_IPFORWARDROW mifr = new MIB_IPFORWARDROW();
mifr.dwForwardDest = destIPAddress;
mifr.dwForwardMask = destMask;
mifr.dwForwardPolicy = Convert.ToUInt32(0);
mifr.dwForwardNextHop = nextHopIPAddress;
mifr.dwForwardIfIndex = ifIndex; //?
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 CreateIpForwardEntry(ref mifr);
}
=========END===========

All IP addresses are added as unsigned ints (double checked whether
they are correct. I even tried adding a row that I just successfully
retrieved (thereby skipping my own structure). If that gives me an
error code 87 (invalid param).

Is there anybody here that has successfully done this or has a few
relevant pointers? Preferably C# examples, but C++ examples are a step
in the right direction. Thanks!
 
M

Mubashir Khan

i would suggest u firstly use the get api and observe your kind of ip entry
for parameter values .... this would be helpful
cyberco said:
I've posted this question in
'microsoft.public.dotnet.framework.compactframework' as well, but
despite the great help I still haven't solved the problem. So before
going the C++ route I would like to see if anybody in this group may
have the answer.

What I'm trying to do is change the route table of my Windows Mobile 5
Pocket PC (.Net CF) device (TyTN) using C#. This is probably similar as
doing it on standard CF. Using Iphlpapi.dll I can retrieve the route
table, but I am unable to change/add a route. I have specified the
following structs/pinvokes:

=========START===========
[StructLayout(LayoutKind.Sequential)]
public struct MIB_IPFORWARDROW {
public UInt32 dwForwardDest; //destination IP address.
public UInt32 dwForwardMask; //Subnet mask
public UInt32 dwForwardPolicy; //conditions for multi-path
route. Unused, specify 0.
public UInt32 dwForwardNextHop; //IP address of the next hop.
Own address?
public UInt32 dwForwardIfIndex; //index of interface
public UInt32 dwForwardType; //route type
public UInt32 dwForwardProto; //routing protocol.
public UInt32 dwForwardAge; //age of route.
public UInt32 dwForwardNextHopAS; //autonomous system number. 0
if not relevant
public int dwForwardMetric1; //-1 if not used (goes for all
metrics)
public int dwForwardMetric2;
public int dwForwardMetric3;
public int dwForwardMetric4;
public int dwForwardMetric5;
}

[StructLayout(LayoutKind.Sequential)]
public struct MIB_IPFORWARDTABLE {
public int dwNumEntries; //number of route entries in
the table.
public MIB_IPFORWARDROW[] table;
}


[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int CreateIpForwardEntry(ref MIB_IPFORWARDROW
pRoute);

[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int DeleteIpForwardEntry(ref MIB_IPFORWARDROW
pRoute);

[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int SetIpForwardEntry(ref MIB_IPFORWARDROW
pRoute);

[DllImport("Iphlpapi.dll")]
[return: MarshalAs(UnmanagedType.U4)]
public static extern int GetIpForwardTable(byte[] pIpForwardTable, out
int pdwSize, bool bOrder);

=========END===========


I invoke these methods as follows:


=========START===========
public int createIpForwardEntry(UInt32 destIPAddress, UInt32 destMask,
UInt32 nextHopIPAddress,
UInt32 ifIndex) {
MIB_IPFORWARDROW mifr = new MIB_IPFORWARDROW();
mifr.dwForwardDest = destIPAddress;
mifr.dwForwardMask = destMask;
mifr.dwForwardPolicy = Convert.ToUInt32(0);
mifr.dwForwardNextHop = nextHopIPAddress;
mifr.dwForwardIfIndex = ifIndex; //?
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 CreateIpForwardEntry(ref mifr);
}
=========END===========

All IP addresses are added as unsigned ints (double checked whether
they are correct. I even tried adding a row that I just successfully
retrieved (thereby skipping my own structure). If that gives me an
error code 87 (invalid param).

Is there anybody here that has successfully done this or has a few
relevant pointers? Preferably C# examples, but C++ examples are a step
in the right direction. Thanks!
Click to expand...
 
C

cyberco

I figured maybe the problem is that I should reserve some memory for
the new MIB_IPFORWARDROW I'm creating (as I do in the following code)?
 

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