File Tunnel: Tunnel TCP connections through a file

File Tunnel

Tunnel TCP connections through a file.

Compatibility

How does it work?

The program starts a TCP listener, and when a connection is received it writes the TCP data into a file. This same file is read by the counterpart program, which establishes a TCP connection and onforwards the TCP data. To avoid the shared file growing indefinitely, it is purged whenever it gets larger than 10 MB.

Example

Bypassing a firewall

You’d like to connect from Host A to Host B, but a firewall is in the way. But both hosts have access to a shared folder.

ft.exe –tcp-listen 127.0.0.1:5000 –write “\\server\share\1.dat” –read “\\server\share\2.dat”

ft.exe –read “\\server\share\1.dat” –tcp-connect 127.0.0.1:3389 –write “\\server\share\2.dat”

Now on Host A, configure the client to connect to: http://127.0.0.1:5000/

This is what the File Tunnel looks like when operating:

Tunnel TCP through RDP (similar to SSH tunnel)

You’d like to connect to a remote service (eg. 192.168.1.50:8888), but only have access to Host B using RDP.

ft.exe –tcp-listen 127.0.0.1:5000 –write “C:\Temp\1.dat” –read “C:\Temp\2.dat”

Run an RDP client and ensure local drives are shared as shown here.

Connect to Host B.

ft.exe –read “\\tsclient\c\Temp\1.dat” –tcp-connect 192.168.1.50:8888 –write “\\tsclient\c\Temp\2.dat”

Now on Host A, you can connect to 127.0.0.1:5000 and it will be forwarded to 192.168.1.50:8888

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Copyright (c) Fidel Perez-Smith