/// <summary>
/// 根据服务器IP获取能连接到该服务器的其中一个客户端面IP地址
/// </summary>
/// <param name="serverIp">服务器IP</param>
/// <returns>找到的客户端IP地址</returns>
public static IPAddress GetPingServerIpClientIp(string serverIp)
{
IPAddress serverIpAddr;
if (!IPAddress.TryParse(serverIp, out serverIpAddr))
{
throw new Exception(string.Format("服务端IP:{0}不是有效有IP值", serverIp));
}
IPAddress ipAddrRet = null;
IPAddress[] ipaddrs = Dns.GetHostAddresses(Dns.GetHostName());
foreach (IPAddress ipAddr in ipaddrs)
{
//ipAddr.AddressFamily :对于 IPv4，返回 InterNetwork；对于 IPv6，返回 InterNetworkV6。
if (serverIpAddr.AddressFamily != ipAddr.AddressFamily)
{
continue;
}
if (IPAddressEx.ValidateClientIpPingServerIp(ipAddr.ToString(), serverIp))
{
ipAddrRet = ipAddr;
break;
}
}
return(ipAddrRet);
}
/// <summary>
/// 验证一个端口号是否被使用
/// </summary>
/// <param name="ipaddr">IP对象</param>
/// <param name="port">需要验证的端口号</param>
/// <returns>如果被使用返回true,否则返回false</returns>
public static bool PortAvailable(this IPAddress ipaddr, int port)
{
List <int> tcpPorts = null;
List <int> udpPorts = null;
List <int> ipPorts = null;
var allports = IPAddressEx.GetUsedPorts(out tcpPorts, out udpPorts, out ipPorts);
return(allports.Contains(port));
}
/// <summary>
/// IPV4地址转换为Int64整数(返回值全为正数)
/// </summary>
/// <param name="ipStr">ip字符串</param>
/// <returns>ip对应的整数</returns>
public static long IPV4ToInt64(string ipStr)
{
if (!IPAddressEx.ValidateIPV4(ipStr))
{
throw new Exception(string.Format("服务端IP:{0}不是有效有IPV4值", ipStr));
}
string[] items = ipStr.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
return(long.Parse(items[0]) << 24
| long.Parse(items[1]) << 16
| long.Parse(items[2]) << 8
| long.Parse(items[3]));
}
/// <summary>
/// 获取已使用的端口号
/// </summary>
/// <returns>当前所有已使用端口号集合</returns>
public static List <int> GetUsedPorts()
{
List <int> tcpPorts, udpPorts, ipPorts;
return(IPAddressEx.GetUsedPorts(out tcpPorts, out udpPorts, out ipPorts));
}