C#•17mo ago

❔ How to work with channel sinks in NET 3.5

I'm attempting to reverse engineer how an application written in NET 3.5 gets data from a server by looking at the traffic in Wireshark and piecing it together with parts that can be decompiled (mostly just interfaces). The trouble I'm currently having is that I'm having trouble understanding how to get the data the server sends. I have setup basic remoting and sinks

TcpChannel clientRemotingChannel = new TcpChannel();
ChannelServices.RegisterChannel(clientRemotingChannel, false);
string objectUri;
System.Runtime.Remoting.Messaging.IMessageSink messageSink = clientRemotingChannel.CreateMessageSink(url + "/LLRemoteServerAccess", null, out objectUri);

System.Runtime.Remoting.Messaging.IMessageSink messageSink2 = clientRemotingChannel.CreateMessageSink(url + "/LLRemoteServer", null, out objectUri);

TcpChannel clientRemotingChannel = new TcpChannel();
ChannelServices.RegisterChannel(clientRemotingChannel, false);
string objectUri;
System.Runtime.Remoting.Messaging.IMessageSink messageSink = clientRemotingChannel.CreateMessageSink(url + "/LLRemoteServerAccess", null, out objectUri);

System.Runtime.Remoting.Messaging.IMessageSink messageSink2 = clientRemotingChannel.CreateMessageSink(url + "/LLRemoteServer", null, out objectUri);

and I'm able to call remote functions

bool r = ((ILLRemoteServerAccess)Activator.GetObject(typeof(ILLRemoteServerAccess), url + "/LLRemoteServerAccess")).Test();

int alias = ((ILLRemoteServer)Activator.GetObject(typeof(ILLRemoteServer), url + "/LLRemoteServer")).DissolveAlias("", ref dbname, ref dbloc, ref dbtype);

bool r = ((ILLRemoteServerAccess)Activator.GetObject(typeof(ILLRemoteServerAccess), url + "/LLRemoteServerAccess")).Test();

int alias = ((ILLRemoteServer)Activator.GetObject(typeof(ILLRemoteServer), url + "/LLRemoteServer")).DissolveAlias("", ref dbname, ref dbloc, ref dbtype);

but alongside the return value there's additional data sent. I'm assuming I need to write a custom sink to get it, but I'm unable to figure out how.

1 Reply

Accord•17mo ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

Gaming

Programming

❔ How to work with channel sinks in NET 3.5