一个用go语言实现的类似/etc/hosts功能的本地dns服务器，使用hostsdns可以在支持本地解析的功能上也避免了/etc/hosts被人篡改导致解析失败。
读取指定文件(/etc/hostsdns, 文件格式为/etc/hosts格式)，提供离线的dns域名解析服务器。
支持IPV4与IPV6
[root@ahanwhite dns]# hostsdns --help
hostsdns is a dns server that implements local resolution functions similar to /etc/hosts.
Using hostsdns can support the local resolution function and avoid the resolution failure caused by tampering of /etc/hosts
Usage:
hostsdns [flags]
Flags:
-h, --help help for hostsdns
--hostfile string hostfile for dnsserver (default is /etc/hostdns) (default "/etc/hostdns")
-p, --port int port for dns server using udp protocol (default is 53) (default 53)