/// <summary>
/// Can be a list of single or comma separated values ips like [ "192.68.12.1", "172.53.22.11, 181.92.91.1, 193.92.91.1".. ]
/// </summary>
/// <param name="headerValues">all the extracted values from ip related headers</param>
/// <param name="https">is a secure connection</param>
/// <returns>return ip and port, may be null</returns>
internal static IpInfo GetRealIpFromValues(IEnumerable <string> headerValues, bool https)
{
IpInfo privateIpInfo = null;
foreach (var header in headerValues)
{
var values = header.Split(',');
foreach (var potentialIp in values)
{
var consideredPotentialIp = potentialIp.Trim();
if (string.IsNullOrEmpty(consideredPotentialIp))
{
continue;
}
var addressAndPort = ExtractAddressAndPort(consideredPotentialIp, defaultPort: DefaultPort(https));
consideredPotentialIp = addressAndPort.IpAddress;
var success = IPAddress.TryParse(consideredPotentialIp, out var ipAddress);
if (success)
{
if (ipAddress.IsIPv4MappedToIPv6)
{
ipAddress = ipAddress.MapToIPv4();
}
if (IsIpInRange(ipAddress, _ipv4Cidrs) || ipAddress.IsIPv6SiteLocal || ipAddress.IsIPv6LinkLocal)
{
privateIpInfo = addressAndPort;
}
else
{
return(new IpInfo(ipAddress.ToString(), addressAndPort.Port));
}
}
}
}
return(privateIpInfo);
}
public ExtractedHeadersAndIpInfos(IDictionary <string, string> headersToSend, IpInfo ipInfo)
{
HeadersToSend = headersToSend;
IpInfo = ipInfo;
}
internal static IpInfo ExtractIpAndPort(Func <string, string> getHeader, string customIpHeader, IEnumerable <string> customExtraHeaders, bool isSecureConnection, IpInfo peerIpFallback)
{
var ipPotentialValues = new List <string>();
if (!string.IsNullOrEmpty(customIpHeader))
{
var value = getHeader(customIpHeader);
if (!string.IsNullOrEmpty(value))
{
ipPotentialValues.Add(getHeader(customIpHeader));
}
}
foreach (var headerIp in IpHeaders)
{
var potentialIp = getHeader(headerIp);
if (!string.IsNullOrEmpty(potentialIp))
{
ipPotentialValues.Add(potentialIp);
}
}
var result = IpExtractor.GetRealIpFromValues(ipPotentialValues, isSecureConnection);
return(result ?? peerIpFallback);
}
public ExtractedHeadersAndIpInfos(IDictionary <string, string> headersToSend, string address, int port)
{
HeadersToSend = headersToSend;
IpInfo = new IpInfo(address, port);
}
