1 00:00:00,420 --> 00:00:01,680 Welcome back everybody. 2 00:00:01,680 --> 00:00:03,550 Let's continue with our ports scandal. 3 00:00:03,780 --> 00:00:09,150 So what we did by now is we important to libraries that we need in order for our program to work. 4 00:00:09,150 --> 00:00:11,810 Let's get straight into coding the main program. 5 00:00:12,480 --> 00:00:12,860 OK. 6 00:00:12,960 --> 00:00:15,050 So first thing let's think about it. 7 00:00:15,060 --> 00:00:20,210 What we need to logically do in order to discover whether airport is open or closed. 8 00:00:20,310 --> 00:00:25,980 Well we need to establish a connection with the target machine and then we need to try to connect to 9 00:00:25,980 --> 00:00:29,970 the specific port if we manage to connect the port is open. 10 00:00:30,060 --> 00:00:32,880 If we don't manage to connect the port is closed. 11 00:00:33,270 --> 00:00:37,560 Now there is not a thing that can happen and that is that the port is filtered but we're not going to 12 00:00:37,560 --> 00:00:39,380 cover that at the moment. 13 00:00:39,390 --> 00:00:43,140 So first of all let's see how we can establish the connection. 14 00:00:43,140 --> 00:00:50,310 Here is where we use this socket library socket library allows us to establish the connection over internet. 15 00:00:50,460 --> 00:00:52,200 So how can we do that. 16 00:00:52,200 --> 00:00:57,240 Well it's rather easy and it's something that people use throughout this course a lot. 17 00:00:57,240 --> 00:01:02,700 It's a same shame of a few different lines of code that will allow us to connect to the target machine. 18 00:01:03,660 --> 00:01:08,280 So in the first line we will define a socket descriptor. 19 00:01:08,280 --> 00:01:14,710 We do that by specifying the name and then equals socket that socket just like this. 20 00:01:14,710 --> 00:01:17,940 We defined the socket descriptor and you can name this anything you want. 21 00:01:17,940 --> 00:01:20,490 It doesn't have to be named socket can be named S.. 22 00:01:20,790 --> 00:01:26,070 But for the purpose of this material we're going to leave it on sock as soon as we do that we can try 23 00:01:26,070 --> 00:01:34,110 to connect to the target machine so socket connect and inside of this connect function we need to specify 24 00:01:34,110 --> 00:01:41,760 to open and to close brackets and there will need to specify the IP address and the port that we want 25 00:01:41,760 --> 00:01:42,860 to connect to. 26 00:01:42,860 --> 00:01:44,060 All right. 27 00:01:44,070 --> 00:01:49,860 Now you will see right away that once again this IP address and this port is under the line threat. 28 00:01:49,950 --> 00:01:52,830 That means that this is not defined. 29 00:01:52,830 --> 00:01:58,980 So we need to define what IP addresses and what port is what we are going to do is we are simply just 30 00:01:58,980 --> 00:02:04,830 going to create a variable which would be called IP address and we're going to set this variable to 31 00:02:04,830 --> 00:02:10,610 be equal to whatever the user of this program inputs during the running of the program. 32 00:02:10,620 --> 00:02:15,450 Now what they mean by that is we are going to use the input function which allows us to add the runtime 33 00:02:15,450 --> 00:02:18,630 specified the IP address that we want to scan. 34 00:02:18,660 --> 00:02:25,520 So we're going to prompt to the user of this program something like this enter target to scan. 35 00:02:27,180 --> 00:02:28,320 OK. 36 00:02:30,840 --> 00:02:39,300 Now that we have that we also need to define the port and let's say the port will be port 80 it will 37 00:02:39,300 --> 00:02:42,270 be a simple integer so we're going to select it like this. 38 00:02:42,270 --> 00:02:48,300 And now our code is good to go all we're left to do is we are left to wrap this inside of a try and 39 00:02:48,300 --> 00:02:52,960 accept rule and destroy unacceptable acceptable basically means that we are going to try this. 40 00:02:53,010 --> 00:02:59,340 And in case that doesn't work we're going to try something else which will be under this except part 41 00:02:59,730 --> 00:03:02,400 so try and then suck it up connect. 42 00:03:02,460 --> 00:03:04,280 We are trying to connect to the port. 43 00:03:04,770 --> 00:03:10,070 And if we don't manage to connect we're going to print to the screen. 44 00:03:10,530 --> 00:03:22,380 That's the port port is closed and we can simply just specify port 80 is closed because we are scanning 45 00:03:22,380 --> 00:03:25,230 that port if we do manage to connect. 46 00:03:25,230 --> 00:03:29,280 We can print port 80 is open. 47 00:03:29,720 --> 00:03:30,060 OK. 48 00:03:30,690 --> 00:03:33,650 So this is the base part of the program. 49 00:03:33,660 --> 00:03:35,940 Let's see whether this works. 50 00:03:36,000 --> 00:03:40,770 Now in order to test this and see whether it works I'm going to pick up random IP address which in this 51 00:03:40,770 --> 00:03:43,290 case will be the IP address of my laptop. 52 00:03:43,290 --> 00:03:48,840 And in your case you can simply just scan any website on the Internet for example let's say we go to 53 00:03:48,840 --> 00:03:53,220 Firefox and we can visit any website we want. 54 00:03:53,250 --> 00:03:58,830 Now keep in mind once we actually managed to visit the website that means that the port 80 is open because 55 00:03:58,830 --> 00:04:00,080 we are loading the web page. 56 00:04:00,090 --> 00:04:02,160 So let's go to this one. 57 00:04:03,300 --> 00:04:05,730 You can choose any you like. 58 00:04:05,730 --> 00:04:07,080 I'm going to scan this one 59 00:04:09,810 --> 00:04:12,250 OK so let's copy this. 60 00:04:12,260 --> 00:04:14,670 This is the name of the website. 61 00:04:14,710 --> 00:04:19,300 Let's go right here inside of our terminal and let's try to run the program. 62 00:04:19,370 --> 00:04:31,190 Python 3 and then the name of the program which in our case is in our case it is Python 3 or scanner. 63 00:04:31,190 --> 00:04:35,480 That is why it will ask us to enter the target scan. 64 00:04:35,480 --> 00:04:37,920 Now you will notice if you specify like this. 65 00:04:38,000 --> 00:04:41,500 So we paste the name of the website and we click you enter. 66 00:04:41,500 --> 00:04:43,770 It will tell you that the port 80 is closed. 67 00:04:44,480 --> 00:04:47,720 Now why does it tell that is the port 80 really closed. 68 00:04:47,840 --> 00:04:53,570 Well not really since we actually managed to open it right here on our Firefox. 69 00:04:53,570 --> 00:04:56,230 Therefore something is wrong with our program. 70 00:04:56,300 --> 00:04:59,230 Well we cannot really specify the link to the actual Web site. 71 00:04:59,240 --> 00:05:02,140 So how can we discover the IP address to this Web site. 72 00:05:02,150 --> 00:05:04,250 Well we can use something called a.. 73 00:05:04,250 --> 00:05:15,520 Look up and we specify the actual link press here enter and what this will do loops it says cannot find. 74 00:05:15,560 --> 00:05:20,420 Let's just try like this without the HDP. 75 00:05:20,480 --> 00:05:24,960 W W W and then the name of the website. 76 00:05:25,170 --> 00:05:26,500 Okay so here it is. 77 00:05:26,560 --> 00:05:31,570 Now we are able to retrieve the IP address to the specific Web site. 78 00:05:31,690 --> 00:05:34,260 What if we copy this IP address and go with this. 79 00:05:34,270 --> 00:05:42,210 So copy and let's clear the screen and run our ports can Canada once again enter target to scan. 80 00:05:42,400 --> 00:05:45,850 We face this and now we get the correct result. 81 00:05:45,850 --> 00:05:47,870 It says port 80 is open. 82 00:05:48,420 --> 00:05:48,780 OK. 83 00:05:49,090 --> 00:05:52,240 So from now on what we did we created two simple variables. 84 00:05:52,240 --> 00:05:56,890 One will host the IP address that we input during the running of the program and the other one will 85 00:05:56,890 --> 00:05:58,930 host the port number 80. 86 00:05:58,960 --> 00:06:00,320 So we are not inputting this. 87 00:06:00,320 --> 00:06:01,550 We're not changing this. 88 00:06:01,570 --> 00:06:04,480 This will simply just tick to eighty four now. 89 00:06:04,480 --> 00:06:09,610 Then we tried to connect and if we managed to connect we print at the port 80 is open. 90 00:06:09,610 --> 00:06:14,010 If we don't manage to connect we print port 80 it's closed again. 91 00:06:14,110 --> 00:06:19,220 So good for now we discovered that the port 80 is open on this specific Web site that we can't. 92 00:06:20,110 --> 00:06:21,720 But this is not really what we want. 93 00:06:21,760 --> 00:06:22,630 Right. 94 00:06:22,660 --> 00:06:24,980 We want to actually scan multiple targets. 95 00:06:25,000 --> 00:06:29,180 We want to scan all ports or as many number of forces would like. 96 00:06:29,380 --> 00:06:35,920 We want to print which port is open which port is closed and ideally we also want to connect to that 97 00:06:35,920 --> 00:06:40,150 port and see which software is it running on that open port. 98 00:06:40,360 --> 00:06:42,670 Now that port scanner would be a really good one. 99 00:06:43,480 --> 00:06:47,390 So let's see in the next few videos how we can implement all of that. 100 00:06:47,470 --> 00:06:53,170 We would also like to change this program to also accept the links and not just the IP addresses. 101 00:06:53,200 --> 00:06:58,660 So you saw previously we couldn't really specify the link it gave us the wrong result because it cannot 102 00:06:58,660 --> 00:07:04,180 really connect to a link inside of this program but we also want to make sure that once the user of 103 00:07:04,180 --> 00:07:09,880 this program specifies the links such as w w w Google dot com it will also managed to discover open 104 00:07:09,880 --> 00:07:11,290 and closed ports. 105 00:07:11,290 --> 00:07:15,990 So we're going to see how we can perform all of that in the next few lectures from now on. 106 00:07:15,990 --> 00:07:19,400 We created the base part and we are ready to continue coding on. 107 00:07:20,050 --> 00:07:20,370 All right. 108 00:07:20,380 --> 00:07:22,390 So hope I tuned in equatorial by.