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					$aisvar{$_} = $1;
					# print STDERR "ais var $_ is $1\n";
				};

				if ($aisvar{identity} eq 'NULL'){
redirect(
"$aisvar{aissri}add?RU=http$ssl_ext://$ENV{SERVER_NAME}$ENV{SCRIPT_NAME}$ENV{PATH_INFO}");
					exit;
				};

				# hooray! we have an identity.
				foreach (keys %aisvar){
					$Sessions{$Coo}->{$_} = $aisvar{$_};
				};

				#reconstruct initial form data if any
				$ENV{QUERY_STRING} = delete $Sessions{$Coo}->{QueryString};
				if(exists $Sessions{$Coo}->{PostData}){
					pipe(POSTREAD,POSTWRITE) or die "Cannot create pipe: $!";
					if (fork){
						# we are in parent
						close POSTWRITE;
						open STDIN, "<&POSTREAD";
						$ENV{REQUEST_METHOD} = 'POST';

					}else{
						# in child -- write POSTdata to pipe and exit
						close STDOUT;
						close STDIN;
						close POSTREAD;
						print POSTWRITE delete $Sessions{$Coo}->{PostData};
						close POSTWRITE or die "$$: Error closing POSTWRITE\n";
						# exit;
						#POSIX:_exit(0); # perldoc -f exit
						exec '/usr/bin/true';
					};
# HAVEOTUKEYEVAL
				};
				goto HAVE_ID;
			}else{
				# redirect us to AIS server PRESENT function

				redirect "${aissri}present?http$ssl_ext://$ENV{SERVER_NAME}$ENV{SCRIPT_NAME}$ENV{PATH_INFO}?OTU_KEY=";
				exit;


			};

# NOIDENTITYEVAL
		};
	}else{
		# no cookie.
		my $suffix = '';
		if($ENV{QUERY_STRING}eq'AIS_INITIAL'){
			# for when the first time we were called with the wrong host name.
			$suffix = 2;
		};
		$ENV{QUERY_STRING}eq'AIS_INITIAL2'and goto NOCOO;
		($Coo = localtime) =~ s/\W//g;
		my @chars = 'A'..'Z' ;
		substr($Coo, rand(length $Coo), 1) = $chars[rand @chars]
		foreach 1..8;
		print "X-Ais-Received-Request-Method: $ENV{REQUEST_METHOD}\n";
		print "X-Ais-Received-Query-String: $ENV{QUERY_STRING}\n";
		$Sessions{$Coo}->{QueryString} = $ENV{QUERY_STRING};
		$ENV{REQUEST_METHOD} =~ /POST/i and
		$Sessions{$Coo}->{PostData} = <>;

		print "Set-Cookie:/${SessionPrefix}_session=$Coo\n";
		redirect "http$ssl_ext://$ENV{SERVER_NAME}$ENV{SCRIPT_NAME}$ENV{PATH_INFO}?AIS_INITIAL$suffix";
		exit;
	};

	print <<EOF;
Content-Type: text/plain

internal AIS module logic error

EOF

	exit;






	NOCOO:
		print <<EOF;
Content-Type: text/plain

Cookies appear to be disabled in your web browser.

Cookie string: $ENV{HTTP_COOKIE}

This program uses a session and authentication system
(AIS, the Authenticated Identity Service)
that relies on cookies.

Please enable cookies and try again. (you may have to log in)

*******************************************************************

You appear to be using a $ENV{HTTP_USER_AGENT}
from $ENV{REMOTE_ADDR}
to access http$ssl_ext://$ENV{SERVER_NAME}$ENV{SCRIPT_NAME}
(this web server is adminned by $ENV{SERVER_ADMIN})

EOF
	exit;

	HAVE_ID:
	$Sessions{$Coo}->{last_access} = time;
	$Identity = $Sessions{$Coo}->{identity};
	if($Identity eq 'ERROR'){
		print <<EOF;
Content-type: text/plain

There was an error with the authentication layer
of this web service: $Sessions{$Coo}->{error}