# < Summary

Information

Class: | Renci.SshNet.Abstractions.DnsAbstraction
Assembly: | Renci.SshNet
File(s): | \home\appveyor\projects\ssh-net\src\Renci.SshNet\Abstractions\DnsAbstraction.cs

Line coverage
100%

Covered lines: | 6
Uncovered lines: | 0
Coverable lines: | 6
Total lines: | 107
Line coverage: | 100%

Branch coverage
N/A

Covered branches: | 0
Total branches: | 0
Branch coverage: | N/A

Method coverage

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# Metrics

Method | Branch coverage | Cyclomatic complexity | Line coverage
--- | --- | --- | ---
GetHostAddresses(...) | 100% | 1 | 100%
GetHostAddressesAsync(...) | 100% | 1 | 100%

# File(s)

## \home\appveyor\projects\ssh-net\src\Renci.SshNet\Abstractions\DnsAbstraction.cs

| # | Line |  | Line coverage
--- | --- | --- | --- | ---
|  | `1` |  | `using System;`
|  | `2` |  | `using System.Net;`
|  | `3` |  | `using System.Net.Sockets;`
|  | `4` |  | `using System.Threading.Tasks;`
|  | `5` |  | ``
|  | `6` |  | `#if FEATURE_DNS_SYNC`
|  | `7` |  | `#elif FEATURE_DNS_APM`
|  | `8` |  | `using Renci.SshNet.Common;`
|  | `9` |  | `#elif FEATURE_DNS_TAP`
|  | `10` |  | `#elif FEATURE_DEVICEINFORMATION_APM`
|  | `11` |  | `using System.Collections.Generic;`
|  | `12` |  | `using System.Linq;`
|  | `13` |  | `using System.Threading;`
|  | `14` |  | `using Microsoft.Phone.Net.NetworkInformation;`
|  | `15` |  | `#elif FEATURE_DATAGRAMSOCKET`
|  | `16` |  | `using System.Collections.Generic;`
|  | `17` |  | `using Windows.Networking;`
|  | `18` |  | `using Windows.Networking.Sockets;`
|  | `19` |  | `#endif`
|  | `20` |  | ``
|  | `21` |  | `namespace Renci.SshNet.Abstractions`
|  | `22` |  | `{`
|  | `23` |  | `internal static class DnsAbstraction`
|  | `24` |  | `{`
|  | `25` |  | `/// <summary>`
|  | `26` |  | `/// Returns the Internet Protocol (IP) addresses for the specified host.`
|  | `27` |  | `/// </summary>`
|  | `28` |  | `/// <param name="hostNameOrAddress">The host name or IP address to resolve.</param>`
|  | `29` |  | `/// <returns>`
|  | `30` |  | `/// An array of type <see cref="IPAddress"/> that holds the IP addresses for the host that`
|  | `31` |  | `/// is specified by the <paramref name="hostNameOrAddress"/> parameter.`
|  | `32` |  | `/// </returns>`
|  | `33` |  | `/// <exception cref="ArgumentNullException"><paramref name="hostNameOrAddress"/> is <see langword="null"/>.</exc`
|  | `34` |  | `/// <exception cref="SocketException">An error is encountered when resolving <paramref name="hostNameOrAddress"/`
|  | `35` |  | `public static IPAddress[] GetHostAddresses(string hostNameOrAddress)`
| 2730 | `36` |  | `{`
|  | `37` |  | `/* TODO Eliminate sync variant, and implement timeout */`
|  | `38` |  | ``
|  | `39` |  | `#if FEATURE_DNS_SYNC`
| 2730 | `40` |  | `return Dns.GetHostAddresses(hostNameOrAddress);`
|  | `41` |  | `#elif FEATURE_DNS_APM`
|  | `42` |  | `var asyncResult = Dns.BeginGetHostAddresses(hostNameOrAddress, null, null);`
|  | `43` |  | `if (!asyncResult.AsyncWaitHandle.WaitOne(Session.InfiniteTimeSpan))`
|  | `44` |  | `throw new SshOperationTimeoutException("Timeout resolving host name.");`
|  | `45` |  | `return Dns.EndGetHostAddresses(asyncResult);`
|  | `46` |  | `#elif FEATURE_DNS_TAP`
|  | `47` |  | `return Dns.GetHostAddressesAsync(hostNameOrAddress).GetAwaiter().GetResult();`
|  | `48` |  | `#else`
|  | `49` |  | `IPAddress address;`
|  | `50` |  | `if (IPAddress.TryParse(hostNameOrAddress, out address))`
|  | `51` |  | `return new [] { address};`
|  | `52` |  | ``
|  | `53` |  | `#if FEATURE_DEVICEINFORMATION_APM`
|  | `54` |  | `var resolveCompleted = new ManualResetEvent(false);`
|  | `55` |  | `NameResolutionResult nameResolutionResult = null;`
|  | `56` |  | `DeviceNetworkInformation.ResolveHostNameAsync(new DnsEndPoint(hostNameOrAddress, 0), result =>`
|  | `57` |  | `{`
|  | `58` |  | `nameResolutionResult = result;`
|  | `59` |  | `resolveCompleted.Set();`
|  | `60` |  | `}, null);`
|  | `61` |  | ``
|  | `62` |  | `// wait until address is resolved`
|  | `63` |  | `resolveCompleted.WaitOne();`
|  | `64` |  | ``
|  | `65` |  | `if (nameResolutionResult.NetworkErrorCode == NetworkError.Success)`
|  | `66` |  | `{`
|  | `67` |  | `var addresses = new List<IPAddress>(nameResolutionResult.IPEndPoints.Select(p => p.Address).Distinct());`
|  | `68` |  | `return addresses.ToArray();`
|  | `69` |  | `}`
|  | `70` |  | `throw new SocketException((int)nameResolutionResult.NetworkErrorCode);`
|  | `71` |  | `#elif FEATURE_DATAGRAMSOCKET`
|  | `72` |  | ``
|  | `73` |  | `// TODO we may need to only return those IP addresses that are supported on the current system`
|  | `74` |  | `// TODO http://wojciechkulik.pl/csharp/winrt-how-to-detect-supported-ip-versions`
|  | `75` |  | ``
|  | `76` |  | `var endpointPairs = DatagramSocket.GetEndpointPairsAsync(new HostName(hostNameOrAddress), "").GetAwaiter().G`
|  | `77` |  | `var addresses = new List<IPAddress>();`
|  | `78` |  | `foreach (var endpointPair in endpointPairs)`
|  | `79` |  | `{`
|  | `80` |  | `if (endpointPair.RemoteHostName.Type == HostNameType.Ipv4 || endpointPair.RemoteHostName.Type == HostNam`
|  | `81` |  | `addresses.Add(IPAddress.Parse(endpointPair.RemoteHostName.CanonicalName));`
|  | `82` |  | `}`
|  | `83` |  | `if (addresses.Count == 0)`
|  | `84` |  | `throw new SocketException((int) System.Net.Sockets.SocketError.HostNotFound);`
|  | `85` |  | `return addresses.ToArray();`
|  | `86` |  | `#else`
|  | `87` |  | `throw new NotSupportedException("Resolving hostname to IP address is not implemented.");`
|  | `88` |  | `#endif // FEATURE_DEVICEINFORMATION_APM`
|  | `89` |  | `#endif`
| 2718 | `90` |  | `}`
|  | `91` |  | ``
|  | `92` |  | `/// <summary>`
|  | `93` |  | `/// Returns the Internet Protocol (IP) addresses for the specified host.`
|  | `94` |  | `/// </summary>`
|  | `95` |  | `/// <param name="hostNameOrAddress">The host name or IP address to resolve.</param>`
|  | `96` |  | `/// <returns>`
|  | `97` |  | `/// A task with result of an array of type <see cref="IPAddress"/> that holds the IP addresses for the host that`
|  | `98` |  | `/// is specified by the <paramref name="hostNameOrAddress"/> parameter.`
|  | `99` |  | `/// </returns>`
|  | `100` |  | `/// <exception cref="ArgumentNullException"><paramref name="hostNameOrAddress"/> is <see langword="null"/>.</exc`
|  | `101` |  | `/// <exception cref="SocketException">An error is encountered when resolving <paramref name="hostNameOrAddress"/`
|  | `102` |  | `public static Task<IPAddress[]> GetHostAddressesAsync(string hostNameOrAddress)`
| 8 | `103` |  | `{`
| 8 | `104` |  | `return Dns.GetHostAddressesAsync(hostNameOrAddress);`
| 8 | `105` |  | `}`
|  | `106` |  | `}`
|  | `107` |  | `}`

# Methods/Properties

GetHostAddresses(System.String)
GetHostAddressesAsync(System.String)