1 00:00:00,390 --> 00:00:01,770 Sometimes it might be necessary 2 00:00:01,770 --> 00:00:05,430 that we like to build software from the source code. 3 00:00:05,430 --> 00:00:09,840 After all, most Linux software is open source. 4 00:00:09,840 --> 00:00:13,320 So the software that's packaged in the .rpm and the .deb, 5 00:00:13,320 --> 00:00:14,970 those are pre-compiled. 6 00:00:14,970 --> 00:00:16,410 But as in the previous lesson 7 00:00:16,410 --> 00:00:18,690 when we downloaded the Nmap files, 8 00:00:18,690 --> 00:00:21,300 we're going to actually compile it ourselves. 9 00:00:21,300 --> 00:00:22,200 Now we're not going to go through 10 00:00:22,200 --> 00:00:24,930 and actually make any of the configuration settings, 11 00:00:24,930 --> 00:00:26,130 but we're just going to walk through the steps 12 00:00:26,130 --> 00:00:29,160 of how to compile the source code. 13 00:00:29,160 --> 00:00:33,123 Now let's first just ensure that the Nmap isn't installed. 14 00:00:35,280 --> 00:00:36,430 This'll be the command. 15 00:00:37,830 --> 00:00:38,663 Okay. 16 00:00:39,837 --> 00:00:40,920 All right, next we'll go ahead 17 00:00:40,920 --> 00:00:45,060 and install this GNU Collection Compiler for C++. 18 00:00:45,060 --> 00:00:46,350 Again, we're going to need this compiler 19 00:00:46,350 --> 00:00:48,690 in order to compile the information 20 00:00:48,690 --> 00:00:50,090 that we downloaded for Nmap. 21 00:00:54,540 --> 00:00:57,630 All right, looks like that went through successfully. 22 00:00:57,630 --> 00:00:59,280 The next thing we're going to do, we're going to go 23 00:00:59,280 --> 00:01:03,330 to the Nmap folder that we downloaded previously. 24 00:01:03,330 --> 00:01:07,683 So if we list this out, we see the nmap-7.0. 25 00:01:08,940 --> 00:01:12,180 All right, next, we're going to use the ./configure command, 26 00:01:12,180 --> 00:01:15,180 and what that's going to do, it's going to allow us 27 00:01:15,180 --> 00:01:17,730 to gather system information needed 28 00:01:17,730 --> 00:01:19,680 about the application to be compiled, 29 00:01:19,680 --> 00:01:21,380 and it stores it in the make file. 30 00:01:29,130 --> 00:01:31,380 All right, looks like that went through successfully. 31 00:01:31,380 --> 00:01:32,213 We have Nmap. 32 00:01:35,070 --> 00:01:38,700 All right, next we need to do, actually compile the system 33 00:01:38,700 --> 00:01:39,800 with the make command. 34 00:01:49,804 --> 00:01:52,110 All right, that went through successfully. 35 00:01:52,110 --> 00:01:54,090 Now once we have this system compiled, 36 00:01:54,090 --> 00:01:55,860 we still must install it. 37 00:01:55,860 --> 00:02:00,003 So the last step is we use the make install command. 38 00:02:04,980 --> 00:02:08,910 And voila, Nmap successfully installed. 39 00:02:08,910 --> 00:02:10,509 Now let's test this bad boy out. 40 00:02:15,780 --> 00:02:17,973 So let's see what we got going on here. 41 00:02:18,960 --> 00:02:21,210 All right, looks like it's good to go. 42 00:02:21,210 --> 00:02:23,550 It gave us the information there, 43 00:02:23,550 --> 00:02:27,660 letting us specify different options, host discovery, 44 00:02:27,660 --> 00:02:30,870 scanning techniques, port specification, 45 00:02:30,870 --> 00:02:32,400 service/version detection. 46 00:02:32,400 --> 00:02:35,200 We get this help information once we type out a command 47 00:02:35,200 --> 00:02:38,340 without any options or arguments presented. 48 00:02:38,340 --> 00:02:41,160 So looks like we're good to go there. 49 00:02:41,160 --> 00:02:43,980 Okay, we installed the compiler for this system 50 00:02:43,980 --> 00:02:48,510 in order to download and compile source code directly. 51 00:02:48,510 --> 00:02:52,470 Again, that maximizes flexibility for any administrator, 52 00:02:52,470 --> 00:02:54,990 'cause remember, Linux is open source. 53 00:02:54,990 --> 00:02:57,930 So a lot of the applications and tools that we'll be using 54 00:02:57,930 --> 00:02:59,580 will be open source as well. 55 00:02:59,580 --> 00:03:02,520 So again, that gives us the freedom and flexibility 56 00:03:02,520 --> 00:03:06,240 to change and maximize performance as needed. 57 00:03:06,240 --> 00:03:07,920 That concludes this demonstration. 58 00:03:07,920 --> 00:03:08,850 Thank you for sticking with me, 59 00:03:08,850 --> 00:03:10,650 and I'll see you in the next lesson.