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authorAdam Frisby2009-05-23 05:09:10 +0000
committerAdam Frisby2009-05-23 05:09:10 +0000
commit2d0613516626960de5d7e3ea83b6386ce00dcb74 (patch)
treee5c2f868532a3b68a12723112f845c735acb6b4d
parentChanging extension of two of the config files to .example because they need t... (diff)
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* Adds new NetworkUtil class, contains methods for handling IP resolution when located on the same subnet. (Eg, can be used to avoid NAT Loopback requirements if fully utilized.)
* Adds a few new network-related methods to Util.
-rw-r--r--OpenSim/Framework/NetworkUtil.cs122
-rw-r--r--OpenSim/Framework/Util.cs14
2 files changed, 136 insertions, 0 deletions
diff --git a/OpenSim/Framework/NetworkUtil.cs b/OpenSim/Framework/NetworkUtil.cs
new file mode 100644
index 0000000..1abf0d8
--- /dev/null
+++ b/OpenSim/Framework/NetworkUtil.cs
@@ -0,0 +1,122 @@
1using System.Collections.Generic;
2using System.Net.Sockets;
3using System.Net;
4using System.Net.NetworkInformation;
5
6namespace OpenSim.Framework
7{
8 /// <summary>
9 /// Handles NAT translation in a 'manner of speaking'
10 /// Allows you to return multiple different external
11 /// hostnames depending on the requestors network
12 ///
13 /// This enables standard port forwarding techniques
14 /// to work correctly with OpenSim.
15 /// </summary>
16 static class NetworkUtil
17 {
18 // IPv4Address, Subnet
19 static readonly Dictionary<IPAddress,IPAddress> m_subnets = new Dictionary<IPAddress, IPAddress>();
20
21 private static IPAddress GetExternalIPFor(IPAddress destination, string defaultHostname)
22 {
23 // Adds IPv6 Support (Not that any of the major protocols supports it...)
24 if (destination.AddressFamily == AddressFamily.InterNetworkV6)
25 {
26 foreach (IPAddress host in Dns.GetHostAddresses(defaultHostname))
27 {
28 if (host.AddressFamily == AddressFamily.InterNetworkV6)
29 return host;
30 }
31 }
32
33 if(destination.AddressFamily != AddressFamily.InterNetwork)
34 return null;
35
36 // Check if we're accessing localhost.
37 foreach (IPAddress host in Dns.GetHostAddresses(Dns.GetHostName()))
38 {
39 if (host.Equals(destination))
40 return destination;
41 }
42
43 // Check for same LAN segment
44 foreach (KeyValuePair<IPAddress, IPAddress> subnet in m_subnets)
45 {
46 byte[] subnetBytes = subnet.Value.GetAddressBytes();
47 byte[] localBytes = subnet.Key.GetAddressBytes();
48 byte[] destBytes = destination.GetAddressBytes();
49
50 if(subnetBytes.Length != destBytes.Length || subnetBytes.Length != localBytes.Length)
51 return null;
52
53 bool valid = true;
54
55 for(int i=0;i<subnetBytes.Length;i++)
56 {
57 if ((localBytes[i] & subnetBytes[i]) != (destBytes[i] & subnetBytes[i]))
58 {
59 valid = false;
60 break;
61 }
62 }
63
64 if (valid)
65 return subnet.Key;
66 }
67
68 // None found. Assume outside network.
69 return null;
70 }
71
72 static NetworkUtil()
73 {
74 foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
75 {
76 foreach (UnicastIPAddressInformation address in ni.GetIPProperties().UnicastAddresses)
77 {
78 if (address.Address.AddressFamily == AddressFamily.InterNetwork)
79 {
80 m_subnets.Add(address.Address, address.IPv4Mask);
81 }
82 }
83 }
84 }
85
86 public static IPAddress GetIPFor(IPEndPoint user, string defaultHostname)
87 {
88 // Try subnet matching
89 IPAddress rtn = GetExternalIPFor(user.Address, defaultHostname);
90 if (rtn != null)
91 return rtn;
92
93 // Otherwise use the old algorithm
94 IPAddress ia;
95
96 if (IPAddress.TryParse(defaultHostname, out ia))
97 return ia;
98
99 ia = null;
100
101 foreach (IPAddress Adr in Dns.GetHostAddresses(defaultHostname))
102 {
103 if (Adr.AddressFamily == AddressFamily.InterNetwork)
104 {
105 ia = Adr;
106 break;
107 }
108 }
109
110 return ia;
111 }
112
113 public static string GetHostFor(IPAddress user, string defaultHostname)
114 {
115 IPAddress rtn = GetExternalIPFor(user, defaultHostname);
116 if(rtn != null)
117 return rtn.ToString();
118
119 return defaultHostname;
120 }
121 }
122}
diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index 35efa02..0128735 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -517,6 +517,20 @@ namespace OpenSim.Framework
517 return null; 517 return null;
518 } 518 }
519 519
520 public static Uri GetURI(string protocol, string hostname, int port, string path)
521 {
522 return new UriBuilder(protocol, hostname, port, path).Uri;
523 }
524
525 /// <summary>
526 /// Gets a list of all local system IP addresses
527 /// </summary>
528 /// <returns></returns>
529 public static IPAddress[] GetLocalHosts()
530 {
531 return Dns.GetHostAddresses(Dns.GetHostName());
532 }
533
520 public static IPAddress GetLocalHost() 534 public static IPAddress GetLocalHost()
521 { 535 {
522 string dnsAddress = "localhost"; 536 string dnsAddress = "localhost";