1 00:00:00,450 --> 00:00:01,710 Welcome back everyone. 2 00:00:01,710 --> 00:00:03,550 Let's continue with our port scanner. 3 00:00:03,980 --> 00:00:10,110 So what we did by now is we simply just created this function which allows us to scan ports and we also 4 00:00:10,110 --> 00:00:16,230 saw how we can use for loop in order to iterate over certain amount ports and scan each and every one 5 00:00:16,230 --> 00:00:16,530 of them. 6 00:00:17,490 --> 00:00:22,680 But right now let's see how we can implement a function that will allow the user of this program to 7 00:00:22,680 --> 00:00:26,280 specify the domain name as well as the IP address they like. 8 00:00:27,240 --> 00:00:30,720 Well here is where our IP Wine Library comes in. 9 00:00:30,720 --> 00:00:31,900 Help. 10 00:00:32,040 --> 00:00:34,410 So you will notice that this is still great. 11 00:00:34,410 --> 00:00:39,380 That means that we haven't used it inside of our code and that will change now. 12 00:00:39,390 --> 00:00:48,480 So will simply just create the function up here which will be called let's say check underscore IP and 13 00:00:48,480 --> 00:00:53,490 this function will take one parameter which we will specify inside of these brackets and that parameter 14 00:00:53,490 --> 00:00:55,980 will be the IP address. 15 00:00:55,980 --> 00:00:57,310 OK. 16 00:00:57,420 --> 00:01:03,690 Now before we code any of this function we need to specify all the way down what we are going to provide 17 00:01:03,690 --> 00:01:05,210 to this function. 18 00:01:05,280 --> 00:01:08,580 And by that I mean which parameter are we going to send. 19 00:01:08,580 --> 00:01:13,860 Well logically in our case we are going to send the IP address parameter. 20 00:01:13,860 --> 00:01:18,600 Keep in mind that this IP address variable doesn't have to store the IP address. 21 00:01:18,600 --> 00:01:21,190 It can also store the domain name. 22 00:01:22,350 --> 00:01:28,440 So what we need to do is we need to simply just after the user specified the target we'll simply just 23 00:01:28,440 --> 00:01:36,120 call the function check underscore IP and we will paste the IP address inside of that function 24 00:01:38,950 --> 00:01:43,420 then we are going to store all of this inside of a converted 25 00:01:46,090 --> 00:01:51,070 underscore IP and you will see in just a second why we are doing this. 26 00:01:51,070 --> 00:01:54,970 So right here we're going to scan the converted IP address 27 00:01:58,390 --> 00:02:03,770 and the port number OK so let's call the function above. 28 00:02:04,200 --> 00:02:09,930 So obviously we need to use this library right here and this sexual library comes with a specific function 29 00:02:10,020 --> 00:02:11,980 which is simply called IP function. 30 00:02:12,000 --> 00:02:12,360 Okay. 31 00:02:13,170 --> 00:02:20,070 So if I go to my Google Chrome and I have a page open right here which is basically the documentation 32 00:02:20,100 --> 00:02:25,830 of the IP why library we can see that they use right here this IP function in order to convert an IP 33 00:02:25,830 --> 00:02:27,860 address to the IP format. 34 00:02:27,990 --> 00:02:33,600 So in order for our function to work we need to specify inside of the brackets the IP address which 35 00:02:33,600 --> 00:02:40,190 is the parameter of our function if it manages to convert the IP address that means that this works 36 00:02:40,190 --> 00:02:45,990 successfully and that the user actually specified the actual IP address for the target if it gets in 37 00:02:45,990 --> 00:02:49,890 value area that means that the user specified the domain name. 38 00:02:50,010 --> 00:02:52,240 So let's write that right here. 39 00:02:52,290 --> 00:02:54,840 And in case you don't understand we are going to test this. 40 00:02:54,840 --> 00:03:01,710 So don't worry we're going to try to convert the IP address and if it manages we are going to return 41 00:03:01,890 --> 00:03:08,850 simply but we sent to the function which is the IP and in case it doesn't work we are going to get the 42 00:03:09,150 --> 00:03:14,700 value error which means that the user most likely specified the domain name. 43 00:03:15,210 --> 00:03:20,910 And therefore we're going to return a function which belongs to the socket library which allows us to 44 00:03:20,910 --> 00:03:24,660 convert to the actual hostname to the IP address. 45 00:03:24,660 --> 00:03:30,390 So all we need to do is specify that function and call it upon our IP address and we can do that by 46 00:03:30,390 --> 00:03:34,960 simply specifying return socket dot get hosted by name. 47 00:03:36,330 --> 00:03:42,480 And here we specify the hostname or in our case the IP which would paste it to our function. 48 00:03:42,480 --> 00:03:42,800 Okay. 49 00:03:43,230 --> 00:03:45,030 So this is our internal function. 50 00:03:45,060 --> 00:03:51,540 Now let's see inside of a terminal and let's open up our Python 3. 51 00:03:52,530 --> 00:03:58,290 And here we can import IP loops images like this. 52 00:03:58,380 --> 00:04:01,320 First of all I will launch this. 53 00:04:01,320 --> 00:04:11,420 So we can see it better open Python 3 in import or from IP y import IP. 54 00:04:12,240 --> 00:04:19,360 And now let's say we have are variable called IP address and it will be when I do that 168. 55 00:04:19,370 --> 00:04:20,190 That one that one. 56 00:04:20,540 --> 00:04:20,890 Okay. 57 00:04:21,480 --> 00:04:29,910 And now if I simply just call converted IP equals IP from IP address 58 00:04:33,540 --> 00:04:40,780 and I print the converted IP you will see it will still be the same IP address. 59 00:04:40,860 --> 00:04:42,770 So it really didn't change anything. 60 00:04:42,780 --> 00:04:43,650 Therefore. 61 00:04:43,650 --> 00:04:48,960 Right here if it manages to do that we are simply just returning the IP address that we pasted inside 62 00:04:48,960 --> 00:04:52,100 of this function and we are not making any changes to it. 63 00:04:52,830 --> 00:04:58,670 But that is only the case if this user specifies the IP address if the user specifies the domain name. 64 00:04:58,680 --> 00:05:08,560 So let's create a variable called domain name equals and then let's say Google dot com and we tried 65 00:05:08,560 --> 00:05:20,440 the same thing so converted IP equals IP from the domain name and you will see we will get an error 66 00:05:20,980 --> 00:05:23,020 and it will be the value error. 67 00:05:23,380 --> 00:05:28,900 So that is the case right here then we are going to perform to get hosted by name which will retrieve 68 00:05:28,900 --> 00:05:34,310 the IP address of the Google dot com and then we will return the IP address inside of others can import 69 00:05:34,360 --> 00:05:35,590 function. 70 00:05:35,590 --> 00:05:38,280 So that is all there is for this function. 71 00:05:38,290 --> 00:05:40,490 Now let's see whether this works. 72 00:05:41,760 --> 00:05:42,280 OK. 73 00:05:42,400 --> 00:05:43,900 So let's run the program. 74 00:05:43,890 --> 00:05:53,200 Python 3 and then port scanner and to target to scan let's say we enter let's say the same Web site 75 00:05:53,260 --> 00:05:53,860 as before. 76 00:05:54,040 --> 00:05:59,750 Let's not change it right now and instead of the IP address we now enter the domain name. 77 00:06:00,580 --> 00:06:02,680 We're going to leave this to run. 78 00:06:02,680 --> 00:06:07,950 And here we can see that it works successfully as it did manage to find the port 80 open. 79 00:06:08,080 --> 00:06:11,890 We will get the same result even if we scanned with an IP address. 80 00:06:11,890 --> 00:06:15,730 So right now we can specify both the domain name and IP address. 81 00:06:15,790 --> 00:06:16,580 So that is good. 82 00:06:17,410 --> 00:06:22,090 Now in the next video we're going to take a look at how we can specify multiple targets and scan multiple 83 00:06:22,090 --> 00:06:23,860 targets at once. 84 00:06:23,860 --> 00:06:26,460 So we don't have to run our program over and over again. 85 00:06:26,530 --> 00:06:31,960 We can do the same thing just by specifying multiple targets inside of our program and it will scan 86 00:06:31,960 --> 00:06:32,760 them one by one. 87 00:06:33,490 --> 00:06:36,080 So we're going to take a look at that in the next story. 88 00:06:36,100 --> 00:06:40,780 Hope you enjoyed this small lecture and now we'll see you in the next one by.