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Welcome to your final module.

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Before we start working on scripts.

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So this last module is a very important one because we have to define what sockets are.

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So we're gonna be using sockets to connect to nodes together.

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Really that's it.

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A more layman's terms what we're doing is we're going to use sockets to connect to an open port an IP

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address.

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So you're going to see this when we build a port scanner.

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You're also going to see this later on in the exploit development portion of the course where we have

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to reach out to a specific port an IP address establish a connection and send malicious data.

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So what we're going to do here is we're going to just build out a simple socket script and we're going

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to connect to an open port with that script and it'll start to make sense.

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And then when you see it in the next video when we build out the port scanner make a little bit more

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sense and you see it again in the course you're going to say hey I remember that we use sockets for

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connecting to ports.

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So here's what we're gonna do.

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We're going to make a file and call the file s dot pi.

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You can call it whatever you want just do not call it socket dot pi if you call it socket that pie you're

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going to run into issues because it's going to think it is a socket.

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So we need to define a couple of things first.

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So we're going to do is we're going to of course shebang of top do our been Python 3 and we're going

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to import socket so remember importing is important.

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We have to import socket up here at the top.

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Now let's define a couple of variables.

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So the first variable we're gonna say is host and we're just going to give that our local address here

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of 1 2 7 0 0 1.

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This is our local host.

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And we're going to define port.

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And I'm just gonna get mine all sevens.

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You can give it whatever you'd like here.

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And I'm going to define another variable like this as equals socket dot socket socket.

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Dot a f net socket dot SOC underscore string.

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Now this looks long and intimidating.

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Please do not be intimidated by this.

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We are just making our life easier on ourselves.

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So we're defining a variable that stores all this into one.

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And this is very very common when it comes to sockets.

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The syntax here is very common.

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So we're saying is hey we want s to equal socket dot socket and this socket a f iiNet socket SOC stream.

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So if iiNet just think about that as IP V for we're connecting over an IP V for connection socket that

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SOC stream.

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You could just think of this as a port.

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So I find it IPD for SOC stream.

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It's a port.

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So let's say we want to make a connection.

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We're going to say s dot connect.

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Now connect is just another part of the socket module.

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So we're going to make a connection here.

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So if you think about this we're using all this and then dot connect.

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Right.

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So we're declaring this.

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And then we have these two parameters here a socket a finite socket Sox stream.

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So the F iiNet.

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We need to say hey let's make this a our host variable and then this one our port variable and we could

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in theory just put in 7 7 7 7 and 1 2 7 0 0 1.

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But it's just easier to find those in a variable up top and then use them later to connect.

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So I'm going to go ahead and save this and then I'm going to open up a new terminal in a new window

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here and I'm going to utilize a tool that we have not used before.

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And this tool is called net cat and we'll use this later on in the course quite a bit.

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So we'll say net cat and I'm just going to say and DLP.

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This means I'm going to establish a listening port I'm going to listen on Port seven seven seven seven

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for a connection.

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So you see here it says hey we're listening on any interface for all sevens you have to worry too much

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about this right now where to go into detail on net cat at a later time but all we're doing right now

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is we're waiting for anybody to connect to us.

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Now here we're sitting at our local host of 1 2 7 0 0 1.

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So we need to establish that connection which is what we're going to do with this script.

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Now the script does nothing.

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It establishes a connection and that is it.

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So let's go ahead and take a quick look where it is going to say Python 3 s stop pi do that come over

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here and you see that we have established connection made.

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And then the connection closed.

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We didn't tell it to do anything.

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There's nothing here to say hey keep this connection open send over some data do anything at all.

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We just said hey make a connection really quick.

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And it did.

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It made a connection from 1 2 7 0 0 1 to 1 2 7 0 0 1 we connected yourselves but with this script we

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had successfully achieved what we wanted to which was to utilise sockets to connect one node to another

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node that's it.

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So we're gonna build upon this whole thing here in the next lesson we're going to build a port scanner.

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It's going to be a bad port scanner but it's still going to be a great lesson.

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So let's go ahead and just take a look at that port scanner and I'll catch it in the next video.