// this is where we are intercepting all file accesses!
static int InterceptDNS_Hooked(
[In] string nodename,
[In] string servicename,
[In] ref AddressInfoW hints,
[Out] out IntPtr ptrResults
)
{
int result_status = 0;
try
{
Main This = (Main)HookRuntimeInfo.Callback;
lock (Queue1)
{
Queue1.Push("[" + RemoteHooking.GetCurrentProcessId() + ":" +
RemoteHooking.GetCurrentThreadId() + "]: \"" + nodename + "\"");
}
}
catch
{
}
// call original API or our custom DNS lookup
if (nodename != "")
{
// LogMessage("InterceptDNS_Hooked: nodename: " + nodename + ".");
// UseCustomDNSForDomain is "all" or a domain like ".abc" with a leading dot.
// App settings aren't seen here, so hardwired:
string UseCustomDNSForDomain = ".altnet";
if (UseCustomDNSForDomain.Equals("all"))
{
result_status = AltNetGetAddrInfoW(
nodename,
servicename,
ref hints,
out ptrResults);
return(result_status);
}
else if (nodename.IndexOf(UseCustomDNSForDomain) == nodename.Length - UseCustomDNSForDomain.Length)
{
// LogMessage("===START ALTNET DOMAIN LOOKUP==================");
LogMessage(nodename + " will use custom DNS lookup.");
// .altnet domain, do our own lookup.
// The results crash Firefox, but not if set to IntPtr.Zero ...
result_status = AltNetGetAddrInfoW(
nodename,
servicename,
ref hints,
out ptrResults);
return(result_status);
}
else
{
result_status = GetAddrInfoW(
nodename,
servicename,
ref hints,
out ptrResults);
return(result_status);
}
}
else
{
LogMessage("InterceptDNS_Hooked: nodename is empty.");
result_status = GetAddrInfoW(
nodename,
servicename,
ref hints,
out ptrResults);
return(result_status);
}
}
// =====================
static unsafe int AltNetGetAddrInfoW(
[In] string nodename,
[In] string servicename,
[In] ref AddressInfoW hints,
[Out] out IntPtr ptrResults)
{
string gotTo = "Start";
try
{
LogMessage("AltNetGetAddrInfoW(): Start.");
////// AddressInfo AltNetOut = new AddressInfo();
char *canonname = stackalloc char[100];
for (int i = 0; i < nodename.Length; i++)
{
canonname[i] = nodename[i];
}
canonname[nodename.Length] = '\0';
// LogMessage("=== NS LOOKUP ==================");
// DnsQuery_W needs to use port 53, so forward post 53 to 53534 on Raspberry Pi.
string AltNetHost = "sherpoint.mooo.com";
string AltNetLocalServerAddress = "192.168.1.65";
int size = 0;
// Check last name server IP update in AltNetNameServerLastCheck
DateTimeNow = DateTime.Now;
DateTimeMinusFiveMinutes = DateTime.Now.AddMinutes(-5);
DateTimeMinusOneMinute = DateTime.Now.AddMinutes(-1);
bool NeedToCheckNameserverIP = false;
int LastNameServerIPResult = DateTime.Compare(AltNetNameServerLastCheck, DateTimeMinusFiveMinutes);
if (AltNetNameServerIP == "0.0.0.0")
{
// Last check failed.
// Need to fetch AltNet name server address.
// If at least 1 minute has elapsed since last fetch.
LastNameServerIPResult = DateTime.Compare(AltNetNameServerLastCheck, DateTimeMinusOneMinute);
if (LastNameServerIPResult > 0)
{
// Last check was less than one minute ago.
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
NeedToCheckNameserverIP = false;
AltNetResult = WSAEWOULDBLOCK;
return(AltNetResult);
}
else
{
NeedToCheckNameserverIP = true;
// LogMessage("Last AltNet name server IP update failed. Need to update again.");
}
}
else
{
if (LastNameServerIPResult < 0)
{
// Last check was more than five minutes ago.
// Need to fetch AltNet name server address.
NeedToCheckNameserverIP = true;
// LogMessage("Last AltNet name server IP update > 5 minutes ago. Need to update again.");
}
else if (LastNameServerIPResult == 0)
{
// Last check was five minutes ago.
// Need to use cached name server address (if it succeeded).
NeedToCheckNameserverIP = false;
// LogMessage("Last AltNet name server IP update = 5 minutes ago. Need to update again.");
}
else if (LastNameServerIPResult > 0)
{
// Last check was less than five minutes ago.
// Need to use cached name server address (if it succeeded).
NeedToCheckNameserverIP = false;
}
}
if (NeedToCheckNameserverIP == true)
{
// OK, fetch a new NeedToCheckNameserverIP.
AltNetNameServerLastCheck = DateTimeNow;
if (AltNetHost == null)
{
LogMessage("AltNet host is null: aborting name server IP lookup.");
AltNetNameServerIPResult = "1.1.1.1";
}
else if (AltNetHost == "")
{
LogMessage("AltNet host is empty: aborting name server IP lookup.");
AltNetNameServerIPResult = "1.1.1.1";
}
else
{
string AltNetNameServerIPResult = GetAltNetNameServerIPAddress(AltNetHost);
if (AltNetNameServerIPResult == "0.0.0.0")
{
AltNetNameServerIP = AltNetNameServerIPResult;
LogMessage("AltNet name server IP lookup failed (0.0.0.0 returned).");
}
else if (AltNetNameServerIPResult.IndexOf("Error") >= 0)
{
LogMessage(AltNetNameServerIPResult);
AltNetNameServerIPResult = "1.1.1.1";
AltNetNameServerIP = AltNetNameServerIPResult;
}
else
{
// Success.
AltNetNameServerIP = AltNetNameServerIPResult;
// LogMessage("AltNet name server IP success: " + AltNetNameServerIP);
}
}
}
if (AltNetNameServerIP == "0.0.0.0" | AltNetNameServerIP == "1.1.1.1")
{
LogMessage("AltNetGetAddrInfoW: IP: 0.0.0.0.");
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAEWOULDBLOCK;
return(AltNetResult);
}
if (NeedToCheckNameserverIP == true)
{
LogMessage("Real AltNet name server IP is " + AltNetNameServerIP);
LocalMachine = IsLocalMachine();
if (LocalMachine == true)
{
AltNetNameServerIPResult = AltNetLocalServerAddress;
AltNetNameServerIP = AltNetNameServerIPResult;
LogMessage("Running on local LAN, using " + AltNetNameServerIP + " as AltNet NS.");
}
}
// OK, now lookup IP of .altnet host, as requested.
// LogMessage("=== IP LOOKUP ==================");
AltNetNameServerIPResult = LookupIPAddressUsingAltNetNS(nodename, AltNetNameServerIP);
if (AltNetNameServerIPResult.IndexOf("Error") >= 0)
{
if (AltNetNameServerIPResult.IndexOf("DNS name does not exist") > 0)
{
LogMessage("AltNet NS returned NxDomain (" + nodename + " does not exist).");
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAHOST_NOT_FOUND;
return(AltNetResult);
}
else
{
LogMessage("Error looking up .altnet host: " + AltNetNameServerIPResult);
}
}
if (AltNetNameServerIPResult == "Error: FORMATERROR")
{
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAEINVAL;
return(AltNetResult);
}
else if (AltNetNameServerIPResult == "Error: NOTIMPLEMENTED")
{
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSATYPE_NOT_FOUND;
return(AltNetResult);
}
else if (AltNetNameServerIPResult == "Error: NOTAUTHORATIVE")
{
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAHOST_NOT_FOUND;
return(AltNetResult);
}
else if (AltNetNameServerIPResult == "Error: NXDOMAIN")
{
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAHOST_NOT_FOUND;
return(AltNetResult);
}
else if (AltNetNameServerIPResult == "Error: SERVERFAILURE")
{
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAEWOULDBLOCK;
return(AltNetResult);
}
else if (AltNetNameServerIPResult == "0.0.0.0" | AltNetNameServerIPResult == "1.1.1.1")
{
LogMessage("AltNet domain IP lookup failed (0.0.0.0 returned).");
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAHOST_NOT_FOUND;
return(AltNetResult);
}
else if (AltNetNameServerIPResult.IndexOf("Error") >= 0)
{
LogMessage("AltNetGetAddrInfoW, catch all other errors. Returning DNS ServerError. IP: '" + AltNetNameServerIP + "'.");
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSAEWOULDBLOCK;
return(AltNetResult);
}
// OK, success.
size = 0;
if (address_in_pointer != IntPtr.Zero)
{
// Marshal.FreeHGlobal(address_in_pointer);
}
// AltNetOut = new AddressInfo();
if (AltNetNameServerIPResult.IndexOf(":") >= 0)
{
LogMessage("DNS server returned an IPv6 address.");
// hints_family = AF_INET6;
}
if (AltNetNameServerIPResult.IndexOf(".") >= 0)
{
LogMessage("DNS server returned an IPv4 address.");
}
else
{
LogMessage("DNS server failed to return an IPv4 or IPv6 address.");
AltNetNameServerIPResult = "1.1.1.1";
ptrResults = IntPtr.Zero;
AltNetResult = WSATYPE_NOT_FOUND;
return(AltNetResult);
}
gotTo = "Near end";
AddressInfoW AltNetOut = new AddressInfoW();
AltNetOut.ai_canonname = canonname;
AltNetOut.ai_family = AF_INET;
AltNetOut.ai_flags = AddressInfoHints.AI_CANONNAME;
AltNetOut.ai_protocol = IPPROTO_TCP;
AltNetOut.ai_socktype = SOCK_STREAM;
address_in_pointer = CreateSockaddrInStructure(AltNetNameServerIPResult, out size);
AltNetOut.ai_addr = (byte *)address_in_pointer;
AltNetOut.ai_addrlen = (uint)size;
AltNetOut.ai_next = null;
LogMessage("AltNetGetAddrInfoW: Marshalling results.");
ptrResults = Marshal.AllocHGlobal(Marshal.SizeOf(AltNetOut));
Marshal.StructureToPtr(AltNetOut, ptrResults, false);
// Firefox doesn't crash if we use the standard GetAddrInfoW()
// or if we set ptrResults to IntPtr.Zero:
// ptrResults = IntPtr.Zero;
LogMessage("AltNetGetAddrInfoW: Returning successful response.");
AltNetResult = 0;
return(AltNetResult);
}
catch (Exception ex)
{
// Not sure how to assign ptrResults, so maybe let GetAddrInfoW() do that
// and return the correct data for an error?
LogMessage("Error in AltNetGetAddrInfoW(): " + ex.Message + " (" + gotTo + ").");
return(GetAddrInfoW(
nodename,
servicename,
ref hints,
out ptrResults));
}
}
static extern int GetAddrInfoW(
[In][MarshalAs(UnmanagedType.LPWStr)] string nodename,
[In][MarshalAs(UnmanagedType.LPWStr)] string servicename,
[In] ref AddressInfoW hints,
out IntPtr ptrResults
);
