Class AccessVerifier

java.lang.Object
  |
  +--AccessVerifier

public class AccessVerifier

extends java.lang.Object

Access verifier for hosts. It checks whether access from/to a host should be accepted or denied, by comparing with the tables in memory.

Field Summary

private java.util.ArrayList	accesses A table of integer constants (ALLOW or DENY), specifying the access
(package private) static int	ALLOW
(package private) static int	BEGINS_ENDS_META
(package private) static int	BEGINS_META
(package private) static int	DENY
(package private) static int	ENDS_META
private java.util.ArrayList	hosts A table of Strings, specifying the host
(package private) static int	NO_META
(package private) static int	NOT_FOUND

Constructor Summary

AccessVerifier(java.lang.String filename)
Builds a new AccessVerifier following the directives written in the ASCII file passed as parameter.

Method Summary

private int	getAccess(java.lang.String hostname) Checks the access directive for a given host.
boolean	shouldAcceptThisClient(java.lang.String clientName) Checks whether a client is acceptable or not.
boolean	shouldAcceptThisServer(java.lang.String serverName) Checks whether a server is acceptable or not.
static void	warnDeniedClient(java.io.OutputStream is) Sends a message which informs that the proxy refuses connection from client.
static void	warnDeniedServer(java.io.OutputStream is, java.lang.String deniedSite) Sends a message which informs that the proxy denies access to a server.
private static void	writeWarningMsg(java.io.OutputStream is, java.lang.String warnMsg) Sends an HTML message into the connection stream.

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

ALLOW

static final int ALLOW

DENY

static final int DENY

NOT_FOUND

static final int NOT_FOUND

NO_META

static final int NO_META

BEGINS_META

static final int BEGINS_META

ENDS_META

static final int ENDS_META

BEGINS_ENDS_META

static final int BEGINS_ENDS_META

accesses

private java.util.ArrayList accesses

A table of integer constants (ALLOW or DENY), specifying the access

hosts

private java.util.ArrayList hosts

A table of Strings, specifying the host

Constructor Detail

AccessVerifier

public AccessVerifier(java.lang.String filename)
               throws java.io.IOException,
                      UnrecognizedCfglineException

Builds a new AccessVerifier following the directives written in the ASCII file passed as parameter.

Parameters:

filename - the name of the file containing the directives

Method Detail

getAccess

private int getAccess(java.lang.String hostname)
               throws java.util.NoSuchElementException

Checks the access directive for a given host.

Parameters:

hostname - the host's name

Returns:

a constant (ALLOW, DENY or NOT_FOUND) describing the access, following the directives of this AccessVerifier object

shouldAcceptThisClient

public boolean shouldAcceptThisClient(java.lang.String clientName)

Checks whether a client is acceptable or not.

Parameters:

clientName - the client's name

Returns:

true if the client is acceptable, false elsewhere

shouldAcceptThisServer

public boolean shouldAcceptThisServer(java.lang.String serverName)

Checks whether a server is acceptable or not.

Parameters:

serverName - the server's name

Returns:

true if the server is acceptable, false elsewhere

warnDeniedClient

public static void warnDeniedClient(java.io.OutputStream is)

Sends a message which informs that the proxy refuses connection from client.

Parameters:

is - the stream of the connection

warnDeniedServer

public static void warnDeniedServer(java.io.OutputStream is,
                                    java.lang.String deniedSite)

Sends a message which informs that the proxy denies access to a server.

Parameters:

is - the stream of the connection

deniedSite - the name of the denied server

writeWarningMsg

private static void writeWarningMsg(java.io.OutputStream is,
                                    java.lang.String warnMsg)

Sends an HTML message into the connection stream.

Parameters:

is - the stream of the connection

warnMsg - the body message