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1
6
7 package com.quikj.server.framework;
8
9 import java.net.*;
10 import java.util.*;
11
12
16 public class AceNetworkAccess
17 {
18 private HashMap list = new HashMap();
19 private InetAddress[] networkList = new InetAddress[0];
20 private InetAddress[] netmaskList = new InetAddress[0];
21
22
23 public AceNetworkAccess()
24 {
25 }
26
27 public boolean add(String  network, String netmask)
28 {
29 try
30 {
31 list.put(InetAddress.getByName(network),
32 InetAddress.getByName(netmask));
33
34 Set network_list = list.keySet();
36 networkList = new InetAddress[network_list.size()];
37 networkList = (InetAddress[])network_list.toArray(networkList);
38
39 Collection netmask_list = list.values();
40 netmaskList = new InetAddress[netmask_list.size()];
41 netmaskList = (InetAddress[])netmask_list.toArray(netmaskList);
42
43 return true;
44 }
45 catch (UnknownHostException ex)
46 {
47 return false;
48 }
49 }
50
51 public boolean match(String host)
52 {
53 try
54 {
55 byte[] addr = InetAddress.getByName(host).getAddress();
56
57 for (int i = 0; i < networkList.length; i++)
58 {
59 byte[] anded = byteArrayAnd(addr, netmaskList[i].getAddress());
60 if (byteArrayEquals(anded, networkList[i].getAddress()) == true)
61 {
62 return true;
63 }
64 }
65 }
66 catch (UnknownHostException ex)
67 {
68 return false;
69 }
70
71 return false;
72 }
73
74 private byte[] byteArrayAnd(byte[] a, byte[] b)
75 {
76 byte[] c = new byte[a.length];
77
78 for (int i = 0; i < a.length; i++)
79 {
80 c[i] = (byte)((a[i]) & (b[i]));
81 }
82
83 return c;
84 }
85
86 private boolean byteArrayEquals(byte[] a, byte[] b)
87 {
88 for (int i = 0; i < a.length; i++)
89 {
90 if (a[i] != b[i]) return false;
91 }
92
93 return true;
94 }
95
96 public static void main(String [] args)
97 {
98 if (((args.length % 2) != 1) && (args.length < 3))
99 {
100 System.err.println("Param 1 = network, Param 2 = netmask, ....... Param n = address");
101 System.exit(1);
102 }
103
104 AceNetworkAccess access = new AceNetworkAccess();
105
106
107 for (int i = 0; i < args.length - 1; i+=2)
108 {
109 if (access.add(args[i], args[i+1]) == false)
110 {
111 System.err.println ("Either network address " + args[i]
112 + " and/or netmask " + args[i+1] + " is not in IP address format");
113 System.exit(1);
114 }
115 }
116
117 if (access.match(args[args.length - 1]) == true)
118 {
119 System.out.println ("MATCHED!");
120 }
121 else
122 {
123 System.out.println ("NOT MATCHED");
124 }
125
126 System.exit(0);
127 }
128 }
129 |
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