Welcome again my aspiring cyber warriors!
Now that you’ve mastered the Fundamentals of Linux, let’s start taking a look at a few of the extra esoteric however equally highly effective Linux instructions for the hacker.A kind of key instructions is curl or shopper URL. This command allows the Linux person to ship and obtain to a specified URL, amongst different issues. This may be particularly helpful in downloading website supply code for evaluation in your lab.
Step #1: curl assist
Let’s start by wanting on the curl assist display screen.
kali > curl -h
To see a extra full assist display screen, you possibly can enter curl –help all.
In it is easiest kind, curl merely targets a URL after which downloads its contents and shows it to your display screen (customary output). Let’s have a look at what it could actually do after we use https://hackers-arise.com as our goal.
kali > curl https://hackers-arise.com
As you possibly can see, nothing occurred. It’s because the default settings in curl don’t enable for a re-direct. Apparently, hackers-arise.com has a re-direct, so curl merely executes with out downloading any information. We will allow re-directs in curl through the use of curl with the -L swap.
Let’s strive it once more with the -L swap and see whether or not we get any output.
kali > curl -L https://hackers-arise.com
As you possibly can see beneath, curl gathered all of the supply code from the URL and shows it to my display screen (stdout).
This output is just not very handy for evaluation. It might be significantly better and simpler to work with to have the output despatched to a textual content file. Let’s strive sending the output from this web site to a file.
To take action, we use the -o swap adopted by the file identify the place we wish the code saved. On this case, I entered;
kali > curl -L -o hackers_website.html https://hackers-arise.com
This time, curl shows a desk and progress bar because it downloads the contents of the web page. Now after we open that file with the extra command, we will see the contents of that web page.
kali > extra hackers_website.html
Step #3: Utilizing curl Anonymously
In some instances, we could need to collect information or supply code anonymously. In that case, we will use a proxy in our curl command to ship the command by way of a specified proxy reminiscent of:
kali > curl -x <proxy IP>:<proxy port> <goal URL>
To entry hackers-arise.com supply code anonymously from a proxy at 45.169.148.11 utilizing port 999, we will merely enter;
kali > curl -x 45.169.148.11:999 -L https://hackers-arise.com
Step #4: Utilizing curl to Ship Information
Along with pulling information from URL’s, curl may push information to URL’s. For example, the web site textbelt.com permits you to ship information to their service so as to ship faux SMS messages. On this case, we will use curl to ship each the cellphone quantity and the message to their website and they’re going to ship the faux textual content message to the goal reminiscent of;
kali > sudo curl -X POST https://textbelt.com/textual content –data-urlencode cellphone=’12152749318′ –data-urlencode message=’Hurry to St. Thomas Hospital! Your spouse has been in a horrible accident!’ -d key=<API key>
For extra on sending faux SMS messages, go to How To Create a Pretend SMS.
Abstract
curl is a type of instructions in Linux that’s typically neglected by novices however is usually a highly effective instrument within the fingers of an skilled Linux person. Is is able to each sending and receiving information throughout the Web and some minutes invested in studying it subtleties can pay huge dividends. Most likely it widest use amongst hackers is downloading supply code from websites for evaluation.
