不需要 root 权限的 ping

https://blog.lilydjwg.me/2013/10/29/non-privileged-icmp-ping.41390.html

https://stackoverflow.com/questions/8290046/icmp-sockets-linux/20105379#20105379

原文地址:https://www.cnblogs.com/hangj/p/7611955.html