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//---IMPORTS--- |
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import uk.org.iscream.cms.server.util.*; |
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import java.util.ArrayList; |
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import java.util.StringTokenizer; |
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import java.net.InetAddress; |
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import java.io.Serializable; |
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* param expression what this rule matches using wildcards |
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*/ |
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public void add(boolean allow, String expression) { |
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_acl.add(new ACLRule(allow, expression)); |
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// default to expecting it to be an IP |
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// we will try to disprove this :) |
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boolean ip = true; |
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short[] ipaddr = {-1, -1, -1, -1}; |
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int i = 0; |
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String s = ""; |
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// tokenize the expression on fullstops, so we can break |
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// up the quads of an IP (if it's an IP!) |
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StringTokenizer st = new StringTokenizer(expression, "."); |
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while(st.hasMoreTokens() && i++ < 4) { |
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s = st.nextToken(); |
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// if it's a wildcard, we'll skip to the next one |
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// as no more checks are required |
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if(s.equals("*")) { |
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continue; |
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} |
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// attempt to parse it into a short |
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try { |
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short n = Short.parseShort(s); |
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// if it's an int but outside of the |
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// valid range, it can't be an IP |
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if(n < 0 || n > 255) { |
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ip = false; |
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// give up checking further |
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break; |
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} |
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ipaddr[i-1] = n; |
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} |
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// if it didn't parse as an int it can't be an IP |
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catch (NumberFormatException e) { |
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ip = false; |
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// give up checking further |
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break; |
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} |
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} |
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// we've done 4 parts, so if there's any |
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// more this can't be an IP |
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if(st.hasMoreTokens()) { |
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ip = false; |
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} |
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// if we've done less than 4, see if the last one |
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// was a wildcard - if it isn't then it's not an IP |
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// -- this allows 129.12.* |
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if(i < 4 && !s.equals("*")) { |
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ip = false; |
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} |
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// if we had one or less entries it can't be an IP |
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// -- this disallows * matching as an IP due |
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// to the rule above |
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if(i <= 1) { |
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ip = false; |
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} |
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// finally print out what we've found. |
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System.out.println("IP("+ip+"): "+expression); |
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if(ip) { |
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for(int j=0; j < ipaddr.length; j++) { |
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System.out.print(ipaddr[j] + " "); |
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} |
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System.out.println(); |
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} |
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_acl.add(new ACLRule(allow, expression, ipaddr, ip)); |
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} |
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/** |
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* @return whether the InetAddress was permitted by the ACL |
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*/ |
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public boolean check(InetAddress address) { |
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String hostname = address.getHostName(); |
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String ip = address.getHostAddress(); |
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short[] ipaddr = ipStringToShort(ip); |
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for(int i=0; i < _acl.size(); i++) { |
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ACLRule rule = (ACLRule) _acl.get(i); |
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if(StringUtils.wildcardCheck(address.getHostName(), rule._expression)) { |
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return rule._allow; |
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if(rule._iprule) { |
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System.out.println("checking ip rule "+rule._expression); |
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//if(StringUtils.wildcardCheck(ip, rule._expression)) { |
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if(compareShorts(ipaddr, rule._ipaddr)) { |
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return rule._allow; |
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} |
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} |
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if(StringUtils.wildcardCheck(address.getHostAddress(), rule._expression)) { |
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return rule._allow; |
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else { |
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System.out.println("checking name rule: "+rule._expression); |
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if(StringUtils.wildcardCheck(hostname, rule._expression)) { |
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return rule._allow; |
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} |
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} |
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} |
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return _defaultMode; |
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} |
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//---PRIVATE METHODS--- |
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private short[] ipStringToShort(String ip) { |
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short[] ipaddr = {-1, -1, -1, -1}; |
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StringTokenizer st = new StringTokenizer(ip, "."); |
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for(int i=0; i < 4 && st.hasMoreTokens(); i++) { |
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try { |
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ipaddr[i] = Short.parseShort(st.nextToken()); |
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} |
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catch(NumberFormatException e) { |
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// do nothing? |
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} |
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} |
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return ipaddr; |
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} |
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|
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private boolean compareShorts(short[] first, short[] second) { |
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if(first.length != second.length) { |
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System.out.println("not equal length"); |
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return false; |
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} |
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for(int i=0; i < first.length; i++) { |
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// -- might want to consider specify which is the wildcard one? |
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System.out.println(i + ":" + first[i] + "," + second[i]); |
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if(first[i] == -1 || second[i] == -1) { |
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continue; |
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} |
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if(first[i] != second[i]) { |
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System.out.println("not equal"); |
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return false; |
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} |
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} |
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System.out.println("equal"); |
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return true; |
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} |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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//---ATTRIBUTES--- |
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* |
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* @param allow whether this is an ALLOW or DENY rule |
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* @param expression what this rule matches |
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* @param iprule whether this is an IP rule |
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*/ |
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< |
private ACLRule(boolean allow, String expression) { |
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> |
private ACLRule(boolean allow, String expression, short[] ipaddr, boolean iprule) { |
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_allow = allow; |
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_expression = expression; |
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_ipaddr = ipaddr; |
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_iprule = iprule; |
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} |
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|
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/** |
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* What this rule matches. |
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*/ |
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private String _expression; |
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|
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private short[] _ipaddr; |
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|
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/** |
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* Whether this is an IP rule. |
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*/ |
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private boolean _iprule; |
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} |
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|
