protected virtual void ProcessBackendResponses_Ver_3(NpgsqlConnector context)
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ProcessBackendResponses");
Stream stream = context.Stream;
NpgsqlMediator mediator = context.Mediator;
// Often used buffers
Byte[] inputBuffer = new Byte[4];
String Str;
Boolean readyForQuery = false;
byte[] asciiRowBytes = new byte[300];
char[] asciiRowChars = new char[300];
while (!readyForQuery)
{
// Check the first Byte of response.
Int32 message = stream.ReadByte();
switch (message)
{
case NpgsqlMessageTypes_Ver_3.ErrorResponse:
{
NpgsqlError error = new NpgsqlError(context.BackendProtocolVersion);
error.ReadFromStream(stream, context.Encoding);
error.ErrorSql = mediator.SqlSent;
mediator.Errors.Add(error);
NpgsqlEventLog.LogMsg(resman, "Log_ErrorResponse", LogLevel.Debug, error.Message);
}
// Return imediately if it is in the startup state or connected state as
// there is no more messages to consume.
// Possible error in the NpgsqlStartupState:
// Invalid password.
// Possible error in the NpgsqlConnectedState:
// No pg_hba.conf configured.
if (!mediator.RequireReadyForQuery)
{
return;
}
break;
case NpgsqlMessageTypes_Ver_3.AuthenticationRequest:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "AuthenticationRequest");
// Eat length
PGUtil.ReadInt32(stream, inputBuffer);
{
Int32 authType = PGUtil.ReadInt32(stream, inputBuffer);
if (authType == NpgsqlMessageTypes_Ver_3.AuthenticationOk)
{
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationOK", LogLevel.Debug);
break;
}
if (authType == NpgsqlMessageTypes_Ver_3.AuthenticationClearTextPassword)
{
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationClearTextRequest", LogLevel.Debug);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
context.Authenticate(context.Password);
break;
}
if (authType == NpgsqlMessageTypes_Ver_3.AuthenticationMD5Password)
{
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationMD5Request", LogLevel.Debug);
// Now do the "MD5-Thing"
// for this the Password has to be:
// 1. md5-hashed with the username as salt
// 2. md5-hashed again with the salt we get from the backend
MD5 md5 = MD5.Create();
// 1.
byte[] passwd = context.Encoding.GetBytes(context.Password);
byte[] saltUserName = context.Encoding.GetBytes(context.UserName);
byte[] crypt_buf = new byte[passwd.Length + saltUserName.Length];
passwd.CopyTo(crypt_buf, 0);
saltUserName.CopyTo(crypt_buf, passwd.Length);
StringBuilder sb = new StringBuilder();
byte[] hashResult = md5.ComputeHash(crypt_buf);
foreach (byte b in hashResult)
{
sb.Append(b.ToString("x2"));
}
String prehash = sb.ToString();
byte[] prehashbytes = context.Encoding.GetBytes(prehash);
stream.Read(inputBuffer, 0, 4);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
// 2.
crypt_buf = new byte[prehashbytes.Length + 4];
prehashbytes.CopyTo(crypt_buf, 0);
inputBuffer.CopyTo(crypt_buf, prehashbytes.Length);
sb = new StringBuilder("md5"); // This is needed as the backend expects md5 result starts with "md5"
hashResult = md5.ComputeHash(crypt_buf);
foreach (byte b in hashResult)
{
sb.Append(b.ToString("x2"));
}
context.Authenticate(sb.ToString());
break;
}
// Only AuthenticationClearTextPassword and AuthenticationMD5Password supported for now.
mediator.Errors.Add(new NpgsqlError(context.BackendProtocolVersion, String.Format(resman.GetString("Exception_AuthenticationMethodNotSupported"), authType)));
}
return;
case NpgsqlMessageTypes_Ver_3.RowDescription:
// This is the RowDescription message.
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "RowDescription");
{
NpgsqlRowDescription rd = new NpgsqlRowDescription(context.BackendProtocolVersion);
rd.ReadFromStream(stream, context.Encoding, context.OidToNameMapping);
mediator.AddRowDescription(rd);
}
// Now wait for the AsciiRow messages.
break;
case NpgsqlMessageTypes_Ver_3.ParameterDescription:
// Do nothing,for instance, just read...
int lenght = PGUtil.ReadInt32(stream, inputBuffer);
int nb_param = PGUtil.ReadInt16(stream, inputBuffer);
for (int i = 0; i < nb_param; i++)
{
int typeoid = PGUtil.ReadInt32(stream, inputBuffer);
}
break;
case NpgsqlMessageTypes_Ver_3.DataRow:
// This is the AsciiRow message.
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "DataRow");
{
NpgsqlAsciiRow asciiRow = new NpgsqlAsciiRow(context.Mediator.LastRowDescription, context.BackendProtocolVersion, asciiRowBytes, asciiRowChars);
asciiRow.ReadFromStream(stream, context.Encoding);
// Add this row to the rows array.
mediator.AddAsciiRow(asciiRow);
}
// Now wait for CompletedResponse message.
break;
case NpgsqlMessageTypes_Ver_3.ReadyForQuery:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ReadyForQuery");
// Possible status bytes returned:
// I = Idle (no transaction active).
// T = In transaction, ready for more.
// E = Error in transaction, queries will fail until transaction aborted.
// Just eat the status byte, we have no use for it at this time.
PGUtil.ReadInt32(stream, inputBuffer);
PGUtil.ReadString(stream, context.Encoding, 1);
readyForQuery = true;
ChangeState(context, NpgsqlReadyState.Instance);
break;
case NpgsqlMessageTypes_Ver_3.BackendKeyData:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BackendKeyData");
// BackendKeyData message.
NpgsqlBackEndKeyData backend_keydata = new NpgsqlBackEndKeyData(context.BackendProtocolVersion);
backend_keydata.ReadFromStream(stream);
mediator.SetBackendKeydata(backend_keydata);
// Wait for ReadForQuery message
break;
case NpgsqlMessageTypes_Ver_3.NoticeResponse:
// Notices and errors are identical except that we
// just throw notices away completely ignored.
{
NpgsqlError notice = new NpgsqlError(context.BackendProtocolVersion);
notice.ReadFromStream(stream, context.Encoding);
mediator.Notices.Add(notice);
NpgsqlEventLog.LogMsg(resman, "Log_NoticeResponse", LogLevel.Debug, notice.Message);
}
// Wait for ReadForQuery message
break;
case NpgsqlMessageTypes_Ver_3.CompletedResponse:
// This is the CompletedResponse message.
// Get the string returned.
PGUtil.ReadInt32(stream, inputBuffer);
Str = PGUtil.ReadString(stream, context.Encoding);
NpgsqlEventLog.LogMsg(resman, "Log_CompletedResponse", LogLevel.Debug, Str);
// Add result from the processing.
mediator.AddCompletedResponse(Str);
break;
case NpgsqlMessageTypes_Ver_3.ParseComplete:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParseComplete");
// Just read up the message length.
PGUtil.ReadInt32(stream, inputBuffer);
readyForQuery = true;
break;
case NpgsqlMessageTypes_Ver_3.BindComplete:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BindComplete");
// Just read up the message length.
PGUtil.ReadInt32(stream, inputBuffer);
readyForQuery = true;
break;
case NpgsqlMessageTypes_Ver_3.EmptyQueryResponse:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "EmptyQueryResponse");
PGUtil.ReadInt32(stream, inputBuffer);
break;
case NpgsqlMessageTypes_Ver_3.NotificationResponse:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "NotificationResponse");
// Eat the length
PGUtil.ReadInt32(stream, inputBuffer);
{
// Process ID sending notification
Int32 PID = PGUtil.ReadInt32(stream, inputBuffer);
// Notification string
String notificationResponse = PGUtil.ReadString(stream, context.Encoding);
// Additional info, currently not implemented by PG (empty string always), eat it
PGUtil.ReadString(stream, context.Encoding);
mediator.AddNotification(new NpgsqlNotificationEventArgs(PID, notificationResponse));
}
if (context.IsNotificationThreadRunning)
{
readyForQuery = true;
}
// Wait for ReadForQuery message
break;
case NpgsqlMessageTypes_Ver_3.ParameterStatus:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParameterStatus");
NpgsqlParameterStatus parameterStatus = new NpgsqlParameterStatus();
parameterStatus.ReadFromStream(stream, context.Encoding);
NpgsqlEventLog.LogMsg(resman, "Log_ParameterStatus", LogLevel.Debug, parameterStatus.Parameter, parameterStatus.ParameterValue);
mediator.AddParameterStatus(parameterStatus.Parameter, parameterStatus);
if (parameterStatus.Parameter == "server_version")
{
// Add this one under our own name so that if the parameter name
// changes in a future backend version, we can handle it here in the
// protocol handler and leave everybody else put of it.
mediator.AddParameterStatus("__npgsql_server_version", parameterStatus);
// context.ServerVersionString = parameterStatus.ParameterValue;
}
break;
case NpgsqlMessageTypes_Ver_3.NoData:
// This nodata message may be generated by prepare commands issued with queries which doesn't return rows
// for example insert, update or delete.
// Just eat the message.
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParameterStatus");
PGUtil.ReadInt32(stream, inputBuffer);
break;
case -1:
// Connection broken. Mono returns -1 instead of throw an exception as ms.net does.
throw new IOException();
default:
// This could mean a number of things
// We've gotten out of sync with the backend?
// We need to implement this type?
// Backend has gone insane?
// FIXME
// what exception should we really throw here?
throw new NotSupportedException(String.Format("Backend sent unrecognized response type: {0}", (Char)message));
}
}
}
protected virtual void ProcessBackendResponses_Ver_2(NpgsqlConnector context)
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ProcessBackendResponses");
Stream stream = context.Stream;
NpgsqlMediator mediator = context.Mediator;
// Often used buffer
Byte[] inputBuffer = new Byte[4];
Boolean readyForQuery = false;
byte[] asciiRowBytes = new byte[300];
char[] asciiRowChars = new char[300];
while (!readyForQuery)
{
// Check the first Byte of response.
switch (stream.ReadByte())
{
case NpgsqlMessageTypes_Ver_2.ErrorResponse:
{
NpgsqlError error = new NpgsqlError(context.BackendProtocolVersion);
error.ReadFromStream(stream, context.Encoding);
error.ErrorSql = mediator.SqlSent;
mediator.Errors.Add(error);
NpgsqlEventLog.LogMsg(resman, "Log_ErrorResponse", LogLevel.Debug, error.Message);
}
// Return imediately if it is in the startup state or connected state as
// there is no more messages to consume.
// Possible error in the NpgsqlStartupState:
// Invalid password.
// Possible error in the NpgsqlConnectedState:
// No pg_hba.conf configured.
if (!mediator.RequireReadyForQuery)
{
return;
}
break;
case NpgsqlMessageTypes_Ver_2.AuthenticationRequest:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "AuthenticationRequest");
{
Int32 authType = PGUtil.ReadInt32(stream, inputBuffer);
if (authType == NpgsqlMessageTypes_Ver_2.AuthenticationOk)
{
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationOK", LogLevel.Debug);
break;
}
if (authType == NpgsqlMessageTypes_Ver_2.AuthenticationClearTextPassword)
{
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationClearTextRequest", LogLevel.Debug);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
context.Authenticate(context.Password);
break;
}
if (authType == NpgsqlMessageTypes_Ver_2.AuthenticationMD5Password)
{
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationMD5Request", LogLevel.Debug);
// Now do the "MD5-Thing"
// for this the Password has to be:
// 1. md5-hashed with the username as salt
// 2. md5-hashed again with the salt we get from the backend
MD5 md5 = MD5.Create();
// 1.
byte[] passwd = context.Encoding.GetBytes(context.Password);
byte[] saltUserName = context.Encoding.GetBytes(context.UserName);
byte[] crypt_buf = new byte[passwd.Length + saltUserName.Length];
passwd.CopyTo(crypt_buf, 0);
saltUserName.CopyTo(crypt_buf, passwd.Length);
StringBuilder sb = new StringBuilder();
byte[] hashResult = md5.ComputeHash(crypt_buf);
foreach (byte b in hashResult)
{
sb.Append(b.ToString("x2"));
}
String prehash = sb.ToString();
byte[] prehashbytes = context.Encoding.GetBytes(prehash);
byte[] saltServer = new byte[4];
stream.Read(saltServer, 0, 4);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
// 2.
crypt_buf = new byte[prehashbytes.Length + saltServer.Length];
prehashbytes.CopyTo(crypt_buf, 0);
saltServer.CopyTo(crypt_buf, prehashbytes.Length);
sb = new StringBuilder("md5"); // This is needed as the backend expects md5 result starts with "md5"
hashResult = md5.ComputeHash(crypt_buf);
foreach (byte b in hashResult)
{
sb.Append(b.ToString("x2"));
}
context.Authenticate(sb.ToString());
break;
}
// Only AuthenticationClearTextPassword and AuthenticationMD5Password supported for now.
mediator.Errors.Add(new NpgsqlError(context.BackendProtocolVersion, String.Format(resman.GetString("Exception_AuthenticationMethodNotSupported"), authType)));
}
return;
case NpgsqlMessageTypes_Ver_2.RowDescription:
// This is the RowDescription message.
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "RowDescription");
{
NpgsqlRowDescription rd = new NpgsqlRowDescription(context.BackendProtocolVersion);
rd.ReadFromStream(stream, context.Encoding, context.OidToNameMapping);
// Initialize the array list which will contain the data from this rowdescription.
mediator.AddRowDescription(rd);
}
// Now wait for the AsciiRow messages.
break;
case NpgsqlMessageTypes_Ver_2.AsciiRow:
// This is the AsciiRow message.
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "AsciiRow");
{
NpgsqlAsciiRow asciiRow = new NpgsqlAsciiRow(context.Mediator.LastRowDescription, context.BackendProtocolVersion, asciiRowBytes, asciiRowChars);
asciiRow.ReadFromStream(stream, context.Encoding);
// Add this row to the rows array.
mediator.AddAsciiRow(asciiRow);
}
// Now wait for CompletedResponse message.
break;
case NpgsqlMessageTypes_Ver_2.BinaryRow:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BinaryRow");
{
NpgsqlBinaryRow binaryRow = new NpgsqlBinaryRow(context.Mediator.LastRowDescription);
binaryRow.ReadFromStream(stream, context.Encoding);
mediator.AddBinaryRow(binaryRow);
}
break;
case NpgsqlMessageTypes_Ver_2.ReadyForQuery:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ReadyForQuery");
readyForQuery = true;
ChangeState(context, NpgsqlReadyState.Instance);
break;
case NpgsqlMessageTypes_Ver_2.BackendKeyData:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BackendKeyData");
// BackendKeyData message.
NpgsqlBackEndKeyData backend_keydata = new NpgsqlBackEndKeyData(context.BackendProtocolVersion);
backend_keydata.ReadFromStream(stream);
mediator.SetBackendKeydata(backend_keydata);
// Wait for ReadForQuery message
break;
;
case NpgsqlMessageTypes_Ver_2.NoticeResponse:
{
NpgsqlError notice = new NpgsqlError(context.BackendProtocolVersion);
notice.ReadFromStream(stream, context.Encoding);
mediator.Notices.Add(notice);
NpgsqlEventLog.LogMsg(resman, "Log_NoticeResponse", LogLevel.Debug, notice.Message);
}
// Wait for ReadForQuery message
break;
case NpgsqlMessageTypes_Ver_2.CompletedResponse:
// This is the CompletedResponse message.
// Get the string returned.
String result = PGUtil.ReadString(stream, context.Encoding);
NpgsqlEventLog.LogMsg(resman, "Log_CompletedResponse", LogLevel.Debug, result);
// Add result from the processing.
mediator.AddCompletedResponse(result);
// Now wait for ReadyForQuery message.
break;
case NpgsqlMessageTypes_Ver_2.CursorResponse:
// This is the cursor response message.
// It is followed by a C NULL terminated string with the name of
// the cursor in a FETCH case or 'blank' otherwise.
// In this case it should be always 'blank'.
// [FIXME] Get another name for this function.
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CursorResponse");
String cursorName = PGUtil.ReadString(stream, context.Encoding);
// Continue waiting for ReadyForQuery message.
break;
case NpgsqlMessageTypes_Ver_2.EmptyQueryResponse:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "EmptyQueryResponse");
PGUtil.ReadString(stream, context.Encoding);
break;
case NpgsqlMessageTypes_Ver_2.NotificationResponse:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "NotificationResponse");
Int32 PID = PGUtil.ReadInt32(stream, inputBuffer);
String notificationResponse = PGUtil.ReadString(stream, context.Encoding);
mediator.AddNotification(new NpgsqlNotificationEventArgs(PID, notificationResponse));
if (context.IsNotificationThreadRunning)
{
readyForQuery = true;
}
// Wait for ReadForQuery message
break;
case -1:
// Connection broken. Mono returns -1 instead of throw an exception as ms.net does.
throw new IOException();
default:
// This could mean a number of things
// We've gotten out of sync with the backend?
// We need to implement this type?
// Backend has gone insane?
// FIXME
// what exception should we really throw here?
throw new NotSupportedException("Backend sent unrecognized response type");
}
}
}