icmpsh - simple reverse ICMP shell
icmpsh is a simple reverse ICMP shell with a win32 slave and a POSIX compatible master in C, Perl or Python.
--- Running the Master ---
The master is straight forward to use. There are no extra libraries required for the C version. 
The Perl master however has the following dependencies:
	* IO::Socket
	* NetPacket::IP
	* NetPacket::ICMP
When running the master, don't forget to disable ICMP replies by the OS. For example:
	sysctl -w net.ipv4.icmp_echo_ignore_all=1
If you miss doing that, you will receive information from the slave, but the slave is unlikely to receive
commands send from the master.
--- Running the Slave ---
The slave comes with a few command line options as outlined below:
-t host host ip address to send ping requests to. This option is mandatory!
-r send a single test icmp request containing the string "Test1234" and then quit. 
		 This is for testing the connection.
-d milliseconds delay between requests in milliseconds 
-o milliseconds timeout of responses in milliseconds. If a response has not received in time, 
		 the slave will increase a counter of blanks. If that counter reaches a limit, the slave will quit.
 The counter is set back to 0 if a response was received.
-b num limit of blanks (unanswered icmp requests before quitting
-s bytes maximal data buffer size in bytes
In order to improve the speed, lower the delay (-d) between requests or increase the size (-s) of the data buffer.