private IPAddressInfo GetNextIPAddressInfo()
{
IPHostEntry ipHostEntry;
lock (this) {
GlobalLog.Print("m_CurrentAddressInfoIndex = " + m_CurrentAddressInfoIndex);
GlobalLog.Print("m_ConnectionsSinceDns = " + m_ConnectionsSinceDns);
GlobalLog.Print("m_IPHostEntryInfos = " + m_IPHostEntryInfos);
m_CurrentAddressInfoIndex++;
if (m_ConnectionsSinceDns < 0 || (m_ConnectionsSinceDns > 0 && m_IPHostEntryInfos != null && m_IPHostEntryInfos.IPAddressInfoList != null && m_CurrentAddressInfoIndex == m_IPHostEntryInfos.IPAddressInfoList.Length))
{
//
// it's either the first time we get here or we reached the end
// of the list of valid IPAddressInfo that we can connect to.
// in this second case, since at least one of the IPAddressInfo we got
// from DNS was valid, we'll query DNS again in case we just need to
// refresh our internal list. note that we don't need to assert DnsPermission
// since the internal method we're calling (Dns.InternalResolve()) doesn't Demand() any
//
m_ConnectionsSinceDns = 0;
try {
GlobalLog.Print("ServicePoint::GetNextIPAddressInfo() calling Dns.InternalResolve() for:" + m_Address.Host);
ipHostEntry = Dns.InternalResolve(m_Address.Host);
GlobalLog.Print("ServicePoint::GetNextIPAddressInfo() Dns.InternalResolve() returns:" + ValidationHelper.ToString(ipHostEntry));
if (ipHostEntry != null && ipHostEntry.AddressList != null && ipHostEntry.AddressList.Length > 0)
{
//
// this call will reset m_IPHostEntryInfos
//
m_CurrentAddressInfoIndex = 0;
m_IPHostEntryInfos = SetAddressList(ipHostEntry);
}
else
{
GlobalLog.Print("Dns.InternalResolve() failed with null");
m_IPHostEntryInfos = null;
}
}
catch (Exception e) {
GlobalLog.Print("Dns.InternalResolve() failed with exception: " + e.Message + " " + e.StackTrace);
m_IPHostEntryInfos = null;
}
}
if (m_IPHostEntryInfos != null && m_IPHostEntryInfos.IPAddressInfoList != null && m_CurrentAddressInfoIndex < m_IPHostEntryInfos.IPAddressInfoList.Length)
{
GlobalLog.Print("GetNextIPAddressInfo() returning " + m_IPHostEntryInfos.IPAddressInfoList[m_CurrentAddressInfoIndex]);
return(m_IPHostEntryInfos.IPAddressInfoList[m_CurrentAddressInfoIndex]);
}
// If we walked the whole list in failure, than reset and retry DNS
if (m_IPHostEntryInfos == null || m_IPHostEntryInfos.IPAddressInfoList == null || m_CurrentAddressInfoIndex >= m_IPHostEntryInfos.IPAddressInfoList.Length)
{
GlobalLog.Print("setting m_ConnectionsSinceDns to -1");
m_ConnectionsSinceDns = -1;
}
}
GlobalLog.Print("GetNextIPAddressInfo() returning null");
return(null);
}
