Perl Socket::inet_aton和inet_ntoa
得到DNS地址的两个主要函数是Socket模块中的inet_aton()函数，用来保存DNS地址，然后使用inet_ntoa()函数把保存的地址转换成IP地址。l inet_aton HOSTNAME
Takes a string giving the name of a host, and translates that to an opaque string (if programming in C, struct in_addr). Takes arguments of both the 'rtfm.mit.edu' type and '18.181.0.24'. If the host name cannot be resolved, returns undef. For multi-homed hosts (hosts with more than one address), the first address found is returned.
For portability do not assume that the result of inet_aton() is 32 bits wide, in other words, that it would contain only the IPv4 address in network order.
l inet_ntoa IP_ADDRESS
Takes a string (an opaque string as returned by inet_aton(), or a v-string representing the four octets of the IPv4 address in network order) and translates it into a string of the form 'd.d.d.d' where the 'd's are numbers less than 256 (the normal human-readable four dotted number notation for Internet addresses).
#!/usr/bin/perl -w
use strict;
use Socket;
my $ipdotted = 'www.wtgame.com';
my $ipnetwork = inet_aton($ipdotted);
my $revipdotted = inet_ntoa($ipnetwork);
print $ipnetwork,"\n";
print "$ipdotted\n$revipdotted \n";
exit 0;
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