#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#endregion
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using System;
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using System.Net;
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namespace log4net.Util.TypeConverters
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{
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/// <summary>
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/// Supports conversion from string to <see cref="IPAddress"/> type.
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/// </summary>
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/// <remarks>
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/// <para>
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/// Supports conversion from string to <see cref="IPAddress"/> type.
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/// </para>
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/// </remarks>
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/// <seealso cref="ConverterRegistry"/>
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/// <seealso cref="IConvertFrom"/>
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/// <author>Nicko Cadell</author>
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internal class IPAddressConverter : IConvertFrom
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{
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#region Implementation of IConvertFrom
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/// <summary>
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/// Can the source type be converted to the type supported by this object
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/// </summary>
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/// <param name="sourceType">the type to convert</param>
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/// <returns>true if the conversion is possible</returns>
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/// <remarks>
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/// <para>
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/// Returns <c>true</c> if the <paramref name="sourceType"/> is
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/// the <see cref="String"/> type.
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/// </para>
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/// </remarks>
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public bool CanConvertFrom(Type sourceType)
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{
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return (sourceType == typeof(string));
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}
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/// <summary>
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/// Overrides the ConvertFrom method of IConvertFrom.
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/// </summary>
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/// <param name="source">the object to convert to an IPAddress</param>
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/// <returns>the IPAddress</returns>
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/// <remarks>
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/// <para>
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/// Uses the <see cref="IPAddress.Parse"/> method to convert the
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/// <see cref="String"/> argument to an <see cref="IPAddress"/>.
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/// If that fails then the string is resolved as a DNS hostname.
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/// </para>
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/// </remarks>
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/// <exception cref="ConversionNotSupportedException">
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/// The <paramref name="source"/> object cannot be converted to the
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/// target type. To check for this condition use the <see cref="CanConvertFrom"/>
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/// method.
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/// </exception>
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public object ConvertFrom(object source)
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{
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string str = source as string;
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if (str != null && str.Length > 0)
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{
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try
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{
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#if NET_2_0 || NETCF_2_0
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#if !NETCF_2_0
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// Try an explicit parse of string representation of an IPAddress (v4 or v6)
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IPAddress result;
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if (IPAddress.TryParse(str, out result))
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{
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return result;
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}
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#endif
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// Try to resolve via DNS. This is a blocking call.
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// GetHostEntry works with either an IPAddress string or a host name
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IPHostEntry host = Dns.GetHostEntry(str);
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if (host != null &&
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host.AddressList != null &&
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host.AddressList.Length > 0 &&
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host.AddressList[0] != null)
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{
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return host.AddressList[0];
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}
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#else
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// Before .NET 2 we need to try to parse the IPAddress from the string first
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// Check if the string only contains IP address valid chars
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if (str.Trim(validIpAddressChars).Length == 0)
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{
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try
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{
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// try to parse the string as an IP address
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return IPAddress.Parse(str);
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}
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catch(FormatException)
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{
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// Ignore a FormatException, try to resolve via DNS
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}
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}
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// Try to resolve via DNS. This is a blocking call.
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IPHostEntry host = Dns.GetHostByName(str);
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if (host != null &&
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host.AddressList != null &&
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host.AddressList.Length > 0 &&
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host.AddressList[0] != null)
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{
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return host.AddressList[0];
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}
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#endif
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}
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catch(Exception ex)
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{
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throw ConversionNotSupportedException.Create(typeof(IPAddress), source, ex);
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}
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}
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throw ConversionNotSupportedException.Create(typeof(IPAddress), source);
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}
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#endregion
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/// <summary>
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/// Valid characters in an IPv4 or IPv6 address string. (Does not support subnets)
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/// </summary>
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private static readonly char[] validIpAddressChars = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','A','B','C','D','E','F','x','X','.',':','%'};
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}
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}
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