/// <summary>
/// Support proxy protocol version 1 header for use with HAProxy.
/// Documented at http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
/// </summary>
/// <param name="command"></param>
/// <param name="errorResponse"></param>
/// <returns></returns>
public bool TryMakeProxy(out SmtpCommand command, out SmtpResponse errorResponse)
{
command = null;
errorResponse = null;
Enumerator.Take();
Enumerator.Skip(TokenKind.Space);
if (TryMake(TryMakeProxyProtoTypeString, out string inetProto) == false)
{
return(false);
}
if (inetProto == "UNKNOWN")
{
// IF INET PROTO IS UNKNOWN REST OF THIS LINE SHOULD BE IGNORED.
command = new ProxyCommand(_options, null, null);
return(true);
}
Enumerator.Skip(TokenKind.Space);
IPAddress sourceIp;
IPAddress destinationIp;
// read addresses if IPv4
if (inetProto == "TCP4")
{
if (TryMakeProxyFromAndToAddresses(TryMakeIpv4AddressLiteral, out sourceIp, out destinationIp) == false)
{
return(false);
}
}
else if (inetProto == "TCP6")
{
if (TryMakeProxyFromAndToAddresses(TryMakeIpv6AddressLiteral, out sourceIp, out destinationIp) == false)
{
return(false);
}
}
else
{
// Unexpected / Invalid protocol in proxy protocol format.
return(false);
}
Enumerator.Skip(TokenKind.Space);
// Read ports
if (TryMakeShortNum(out var sourcePort) == false)
{
return(false);
}
Enumerator.Skip(TokenKind.Space);
if (TryMakeShortNum(out var destinationPort) == false)
{
return(false);
}
command = new ProxyCommand(_options, new IPEndPoint(sourceIp, sourcePort),
new IPEndPoint(destinationIp, destinationPort));
return(true);
}
/// <summary>
/// Visit an PROXY command.
/// </summary>
/// <param name="command">The command that is being visited.</param>
protected virtual void Visit(ProxyCommand command)
{
}
