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package HotSaNICmod::OSdep;

sub version {
  ($VERSION = '$Revision: 1.4 $') =~ s/.*(\d+\.\d+).*/$1/;
  return "$^O.pm $VERSION";
  }

sub sample {
  my %args=@_;

  my @values=(0,0,0,0,0,0,0,0,0,0,0,0);

  open FILE,"/proc/net/tcp";
  while (<FILE>) {
    (undef,undef,undef,$state)=split;
    if ($state =~ /[0-9A-F]+/) {
      if ($state =~ /^0/) {
        $state =~ s/^0//;
        if ($state eq "A") { $state=10; }
        elsif ($state eq "B") { $state=11; }
        elsif ($state !~ /[0-9]/) { $state=0; }
        }
      else { $state=0; }
      $values[$state]++;
      }
    }
  close FILE;
  HotSaNICmod::do_rrd("connections","U",time,@values);
  }

1;

#  known states:
#
#  01=ESTABLISHED  02=SYN_SENT  03=SYN_RECV  04=FIN_WAIT1  05=FIN_WAIT2
#  06=TIME_WAIT    07=CLOSE     09=LAST_ACK  0A=LISTEN     0B=CLOSING

#  TODO:
#
#  this module only stats local connections.
#
#  to stat ALL (i.e. including masq'ed) connections: use /proc/net/ip_conntrack
#  select all lines containing "tcp" as 1st keyword
#  the connection state can be found in plaintext on pos. #4
#
#  ATTENTION: This stat also contains the connections to the local configured IPs!
# 
#  format of ip_conntrack:
#
#  <proto> <proto#> <expire time (sec.)> <original source> <packet destination> <src port> <dst port> <expected return source> <expected return dest> <expected ret. src port> <expected ret. dst port> <use>
#
# for more details see:
#   http://www.faqs.org/docs/iptables/theconntrackentries.html
#   <kernel source tree>/net/ipv4/netfilter/ip_conntrack.c 
#   <kernel source tree>/include/linux/netfilter_ipv4/ip_conntrack.h