hostlookup.php

<?php
/*
REQUIREMENTS
* A custom slash command on a Slack team
* A web server running PHP5 with cURL enabled
USAGE
* Place this script on a server running PHP5 with cURL.
* Set up a new custom slash command on your Slack team: 
  http://my.slack.com/services/new/slash-commands
* Under "Choose a command", enter whatever you want for 
  the command. /dns is easy to remember.
* Under "URL", enter the URL for the script on your server.
* Leave "Method" set to "Post".
* Decide whether you want this command to show in the 
  autocomplete list for slash commands.
* If you do, enter a short description and usage hint.
*/

# Grab some of the values from the slash command, create vars for post back to Slack
$command = $_POST['command'];
$text = $_POST['text'];
$token = $_POST['token'];

# Check the token and make sure the request is from our team 

if($token !='Md2ml70QrR7yabxW6vq6HxIU'){ #replace this with the token from your slash command configuration page
  $msg = "The token for the slash command doesn't match. Check your script.";
  die($msg);
  echo $msg;
}

$user_agent = "Slack/1.0";

# We want to get the JSON version back (you can also get plain text).
$url_to_check = "http://api.hackertarget.com/hostsearch/?q=".$text;

# Set up cURL 
$ch = curl_init($url_to_check);
# Set up options for cURL 

# We want to get the value back from our query 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

# Send in our user agent string 
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);

# Make the call and get the response 
$ch_response = curl_exec($ch);
# Close the connection 
curl_close($ch);

# Send the reply back to the user. 
echo $ch_response;