114 lines
3.6 KiB
Plaintext
114 lines
3.6 KiB
Plaintext
///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: DNSImpConnection.gs
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// Note: Client-side helper for the IP Channel Contract
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//
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using System;
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using System.Threading;
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using System.Net.IP;
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using Drivers.Net;
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using Microsoft.SingSharp;
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using Microsoft.Singularity;
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using Microsoft.Singularity.Channels;
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using Microsoft.Singularity.Directory;
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using NetStack.Contracts;
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using NetStack.Runtime;
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namespace NetStack.Channels.Public
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{
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public class DNSImpConnection
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{
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// Converts the results of GerNameServers to IPv4 structures
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public static IPv4[]! GetNameServers(DNSContract.Imp:ReadyState! ep)
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{
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uint[] in ExHeap addrList;
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ep.SendGetNameServers();
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ep.RecvAddressList(out addrList);
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try
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{
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IPv4[] retval;
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if (addrList == null) {
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retval = new IPv4[0];
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}
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else {
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retval = new IPv4[addrList.Length];
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for (int i = 0; i < addrList.Length; ++i)
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{
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retval[i] = new IPv4(addrList[i]);
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}
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}
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return retval;
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}
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finally
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{
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delete addrList;
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}
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}
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// Converts the retrieved address(es) to IPv4 structures.
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// Returns true iff the named host was found successfully.
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public static bool Resolve(DNSContract.Imp! ep, string name,
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out string[] aliases, out IPv4[] addrs)
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{
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aliases = null;
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addrs = null;
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ep.SendResolve(Bitter.FromString(name));
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switch receive
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{
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case ep.RecvDNSResults(uint[] in ExHeap addrList,
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char[][] in ExHeap aliasesResult) :
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{
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try
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{
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if (aliasesResult != null)
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{
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aliases = new string[aliasesResult.Length];
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for (int i = 0; i < aliasesResult.Length; ++i)
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{
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expose (aliasesResult[i]) {
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aliases[i] = Bitter.ToString(aliasesResult[i]);
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}
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}
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}
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else {
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aliases = new string[0];
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}
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if (addrList != null) {
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addrs = new IPv4[addrList.Length];
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for (int i = 0; i < addrList.Length; ++i)
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{ addrs[i] = new IPv4(addrList[i]); }
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}
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else {
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addrs = new IPv4[0];
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}
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return true; // success;
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}
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finally
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{
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delete aliasesResult; // does deep freeing
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delete addrList;
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}
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}
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break;
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case ep.RecvNotFound() :
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return false; // failure
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break;
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}
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return false;
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}
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}
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}
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