IPv4 addresses are 32-bit; they are often handled as integer values (uint32_t).
Perl provides pack and unpack for working with rigid-format data. For example:
my $ip = "123.223.11.22";
my @ip = split /\./, $ip;
my $p = pack "C4", @ip; # packed as 4-octet thing
my $x = unpack "N", $p; # ip as unsigned int
# work on integer values, e.g. masking is just ($x & $y)
$p = pack "N", $x; # re-pack the value
my $bitvec = unpack "B32", $p;
my $quad = join q(.), unpack "C4", $p;
print "as bitvector: $bitvec\n";
print "as dotted quad: $quad\n";
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|