| 1 | #!/usr/bin/perl
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| 2 |
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| 3 | use strict;
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| 4 | use warnings;
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| 5 | use CGI::Carp qw(fatalsToBrowser);
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| 6 | use NetAddr::IP;
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| 7 | use CommonWeb qw(:ALL);;
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| 8 |
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| 9 | #file snCalc.cgi little subnet calculator app
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| 10 |
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| 11 | my %webvar = parse_post();
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| 12 | my $input;
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| 13 |
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| 14 | print "Content-Type: text/html\n\n";
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| 15 |
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| 16 | open(HTML, "../startsn.html")|| die "Could not open startsn.html :$!";
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| 17 | my $start = join('', <HTML>);
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| 18 | close(HTML);
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| 19 | print $start;
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| 20 |
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| 21 | # Clean up input so we don't divide by zero or something equally silly
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| 22 | if ($webvar{input} =~ m/(\d+)/) {
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| 23 | $input = 1*$1;
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| 24 | $input = 3 if $input < 3;
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| 25 | $input = 29 if $input > 29; # Not doing IPv6 yet...
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| 26 | } else {
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| 27 | $input = 29;
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| 28 | }
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| 29 |
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| 30 | my $ltinput = $input - 1;
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| 31 | my $gtinput = $input + 1;
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| 32 |
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| 33 | my $prenet = new NetAddr::IP "0.0.0.0/$ltinput";
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| 34 | my $net = new NetAddr::IP "0.0.0.0/$input";
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| 35 | my $postnet = new NetAddr::IP "0.0.0.0/$gtinput";
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| 36 |
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| 37 | print qq(<div class="center">
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| 38 | <table align="center" cellspacing="3" cellpadding="3">
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| 39 | <tr>
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| 40 | <td class="heading" align="center">Results for /$ltinput</td>
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| 41 | <td class="heading" align="center">Results for /$input</td>
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| 42 | <td class="heading" align="center">Results for /$gtinput</td>
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| 43 | </tr>
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| 44 | );
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| 45 |
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| 46 | print qq(<tr><td valign="top">\n).
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| 47 | qq( <div class="mask">).$prenet->mask."</div>\n".
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| 48 | qq( <div class="wildcard">).$prenet->wildcard."</div>\n".
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| 49 | getranges($ltinput).
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| 50 | qq(</td>\n<td valign="top" bgcolor="#d0e0e0">\n).
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| 51 | qq( <div class="mask">).$net->mask."</div>\n".
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| 52 | qq( <div class="wildcard">).$net->wildcard."</div>\n".
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| 53 | getranges($input).
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| 54 | qq(</td>\n<td valign="top">).
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| 55 | qq( <div class="mask">).$postnet->mask."</div>\n".
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| 56 | qq( <div class="wildcard">).$postnet->wildcard."</div>\n".
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| 57 | getranges($gtinput);
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| 58 |
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| 59 | print "</td></tr>\n</table>\n";
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| 60 |
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| 61 | print qq(<input type="button" value="Back" onclick="history.go(-1)" class="heading">
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| 62 | </div>
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| 63 | </body>
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| 64 | </html>
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| 65 | );
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| 66 |
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| 67 | # Just In Case
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| 68 | exit 0;
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| 69 |
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| 70 | # subs
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| 71 | sub xrange {
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| 72 | my $block = shift;
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| 73 | my $masklen = shift;
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| 74 | my $data = $block->range;
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| 75 | if ($masklen >= 24) {
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| 76 | $data =~ s/\b0\.0\.0\./x.x.x./g;
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| 77 | } elsif ($masklen >=16) {
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| 78 | $data =~ s/\b0\.0\.(\d+\.\d+)/x.x.$1/g;
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| 79 | } elsif ($masklen >=8) {
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| 80 | $data =~ s/\b0\.(\d+\.\d+\.\d+)/x.$1/g;
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| 81 | }
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| 82 | return $data;
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| 83 | } # xrange()
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| 84 |
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| 85 |
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| 86 | sub getranges {
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| 87 | my $masklen = shift;
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| 88 | my $ret = '';
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| 89 | my $super;
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| 90 | if ($masklen < 8) {
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| 91 | $super = new NetAddr::IP "0.0.0.0/0";
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| 92 | } elsif ($masklen < 16) {
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| 93 | $super = new NetAddr::IP "0.0.0.0/8";
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| 94 | } elsif ($masklen < 24) {
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| 95 | $super = new NetAddr::IP "0.0.0.0/16";
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| 96 | } else {
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| 97 | $super = new NetAddr::IP "0.0.0.0/24";
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| 98 | }
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| 99 | foreach my $net ($super->split($masklen)) {
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| 100 | $ret .= "\t".xrange($net,$masklen)."<br />\n";
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| 101 | }
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| 102 | return $ret;
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| 103 | } # getranges()
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