Porto is a simple TCP port scanner written in C.

For every port, it does send a raw TCP/IP packet with the SYN flag set.
At the same time, it does listen for packets with the SYN and ACK flags set.

As explained in RFC 793 <https://www.ietf.org/rfc/rfc793.txt>, upon reception
of a SYN segment, if a tcp port is "listening", a SYN and an ACKnowledgement for
the SYN received are sent.

Porto doesn't try to complete the handshake by sending a final ACK. Consequently,
the other side doesn't get to the ESTABLISHED state and hence no connection is
actually happening. This technique is called stealth scanning.



Debian INSTALL
--------------
Install the dependencies:
	sudo apt-get install libdumbnet-dev libevent-dev libpcap-dev

Build Porto:
	./build_linux.sh


FreeBSD INSTALL
---------------
Install the dependencies:
	sudo pkg install libdnet libpcap libevent2

Build Porto:
	./build_freebsd.sh


TUTORIAL
--------
Run the tests:
	sudo ./porto -t

Scan itself (Linux):
	sudo ./porto -i lo -s 127.0.0.1 -d 127.0.0.1

Scan itself (FreeBSD):
	sudo ./porto -i lo0 -s 127.0.0.1 -d 127.0.0.1

Scan target:
	sudo ./porto -i wlan0 -s 192.168.1.2 -d 8.8.8.8

Example:
	$ sudo ./porto -i wlan0 -s 192.168.2.103 -d 8.8.8.8 -p 1000
	Scanning 8.8.8.8...
	53 	 open 
	-- completed --