$p=shift;$a=shift;i(shift);socket S,2,1,6;bind S,&a($a);listen
S,5;$/=undef;while(@ARGV&&($_="$p $a f".shift)||accept(C,S)&&($_=<C>)&&close
C){m!^(.*?) (.*?) ([e-i])([^/]*)/!s&&$1 eq$p&&&$3($2,$4,$');}sub e{open
F,'>',$_[1];print F $_[2];close F}sub f{&s($_,@_)for keys %k}sub
g{open(F,'<',$_[1])&&&s($_[0],$a,"e$_[1]",<F>);close F}sub
h{&s($_[0],$_,'i')for keys %k}sub i{$k{$_[0]}=1}sub
a{$_[0]=~/:/;pack'CxnC4x8',2,$',split'\.',$`}sub
s{socket X,2,1,6;$w=shift;if(connect X,&a($w)){print X
"$p $_[0] $_[1]/$_[2]";close X}else{undef $k{$p}}}