一直研究SYN可行的扫描方案，想了一下，自己模拟写了一个，
但是感觉特别不理想。还得修改，mark一下。
#!/usr/bin/perl
use threads;
use Thread::Queue;
use Thread::Semaphore;
use Net::Ping;
# create queue
my $q=new Thread::Queue;
# read for check list
my @target=<>;
foreach my $ip (@target){
foreach my $port (1..65535){
$q->enqueue(nex($ip,$port));
}
}
print $q->pending;
#my $se = Thread::Semaphore->new(100);
#my @check_list;
#foreach my $ip (@target){
# if(${$se} <= 0){
# for my $t (threads->list(threads::joinable)){
# $t->join();
# $se->up();
# }
# redo;
# }
# $se->down();
# threads->create(\&nex,$ip)
#}
#for my $t(threads->list()){
# $t->detach();
# $t->join();
#}
sub nex{
($ip,$port)=@_;
chomp($ip);
$scan=Net::Ping->new('syn');
$scan->port_number($port);
$scan->ping($ip);
if($scan->ack){
print "ip:$ip port:$port open\n";
}
$scan->close();
}
