protected IEnumerable<IServerResponseObject> ProcessBackendResponses_Ver_3(NpgsqlConnector context)
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ProcessBackendResponses");
using (new ContextResetter(context))
{
Stream stream = context.Stream;
NpgsqlMediator mediator = context.Mediator;
NpgsqlRowDescription lastRowDescription = null;
List<NpgsqlError> errors = new List<NpgsqlError>();
for (;;)
{
// Check the first Byte of response.
BackEndMessageCode message = (BackEndMessageCode) stream.ReadByte();
switch (message)
{
case BackEndMessageCode.ErrorResponse:
NpgsqlError error = new NpgsqlError(context.BackendProtocolVersion, stream);
error.ErrorSql = mediator.SqlSent;
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 (!context.RequireReadyForQuery)
{
throw new NpgsqlException(errors);
}
break;
case BackEndMessageCode.AuthenticationRequest:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "AuthenticationRequest");
// Get the length in case we're getting AuthenticationGSSContinue
int authDataLength = PGUtil.ReadInt32(stream) - 8;
AuthenticationRequestType authType = (AuthenticationRequestType) PGUtil.ReadInt32(stream);
switch (authType)
{
case AuthenticationRequestType.AuthenticationOk:
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationOK", LogLevel.Debug);
break;
case AuthenticationRequestType.AuthenticationClearTextPassword:
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationClearTextRequest", LogLevel.Debug);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
context.Authenticate(context.Password);
break;
case AuthenticationRequestType.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.Password;
byte[] saltUserName = ENCODING_UTF8.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 = ENCODING_UTF8.GetBytes(prehash);
crypt_buf = new byte[prehashbytes.Length + 4];
stream.Read(crypt_buf, prehashbytes.Length, 4);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
// 2.
prehashbytes.CopyTo(crypt_buf, 0);
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(ENCODING_UTF8.GetBytes(sb.ToString()));
break;
#if WINDOWS && UNMANAGED
case AuthenticationRequestType.AuthenticationSSPI:
{
if (context.IntegratedSecurity)
{
// For SSPI we have to get the IP-Address (hostname doesn't work)
string ipAddressString = ((IPEndPoint)context.Socket.RemoteEndPoint).Address.ToString();
context.SSPI = new SSPIHandler(ipAddressString, "POSTGRES");
ChangeState(context, NpgsqlStartupState.Instance);
context.Authenticate(context.SSPI.Continue(null));
break;
}
else
{
// TODO: correct exception
throw new Exception();
}
}
case AuthenticationRequestType.AuthenticationGSSContinue:
{
byte[] authData = new byte[authDataLength];
PGUtil.CheckedStreamRead(stream, authData, 0, authDataLength);
byte[] passwd_read = context.SSPI.Continue(authData);
if (passwd_read.Length != 0)
{
context.Authenticate(passwd_read);
}
break;
}
#endif
default:
// Only AuthenticationClearTextPassword and AuthenticationMD5Password supported for now.
errors.Add(
new NpgsqlError(context.BackendProtocolVersion,
String.Format(resman.GetString("Exception_AuthenticationMethodNotSupported"), authType)));
throw new NpgsqlException(errors);
}
break;
case BackEndMessageCode.RowDescription:
yield return lastRowDescription = new NpgsqlRowDescriptionV3(stream, context.OidToNameMapping, context.CompatVersion);
break;
case BackEndMessageCode.ParameterDescription:
// Do nothing,for instance, just read...
int lenght = PGUtil.ReadInt32(stream);
int nb_param = PGUtil.ReadInt16(stream);
for (int i = 0; i < nb_param; i++)
{
int typeoid = PGUtil.ReadInt32(stream);
}
break;
case BackEndMessageCode.DataRow:
yield return new ForwardsOnlyRow(new StringRowReaderV3(lastRowDescription, stream));
break;
case BackEndMessageCode.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);
stream.ReadByte();
ChangeState(context, NpgsqlReadyState.Instance);
if (errors.Count != 0)
{
throw new NpgsqlException(errors);
}
yield break;
case BackEndMessageCode.BackendKeyData:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BackendKeyData");
// BackendKeyData message.
NpgsqlBackEndKeyData backend_keydata = new NpgsqlBackEndKeyData(context.BackendProtocolVersion, stream);
context.BackEndKeyData = backend_keydata;
// Wait for ReadForQuery message
break;
case BackEndMessageCode.NoticeResponse:
// Notices and errors are identical except that we
// just throw notices away completely ignored.
context.FireNotice(new NpgsqlError(context.BackendProtocolVersion, stream));
break;
case BackEndMessageCode.CompletedResponse:
PGUtil.ReadInt32(stream);
yield return new CompletedResponse(stream);
break;
case BackEndMessageCode.ParseComplete:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParseComplete");
// Just read up the message length.
PGUtil.ReadInt32(stream);
yield break;
case BackEndMessageCode.BindComplete:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BindComplete");
// Just read up the message length.
PGUtil.ReadInt32(stream);
yield break;
case BackEndMessageCode.EmptyQueryResponse:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "EmptyQueryResponse");
PGUtil.ReadInt32(stream);
break;
case BackEndMessageCode.NotificationResponse:
// Eat the length
PGUtil.ReadInt32(stream);
context.FireNotification(new NpgsqlNotificationEventArgs(stream, true));
if (context.IsNotificationThreadRunning)
{
yield break;
}
break;
case BackEndMessageCode.ParameterStatus:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParameterStatus");
NpgsqlParameterStatus parameterStatus = new NpgsqlParameterStatus(stream);
NpgsqlEventLog.LogMsg(resman, "Log_ParameterStatus", LogLevel.Debug, parameterStatus.Parameter,
parameterStatus.ParameterValue);
context.AddParameterStatus(parameterStatus);
if (parameterStatus.Parameter == "server_version")
{
// Deal with this here so that if there are
// changes in a future backend version, we can handle it here in the
// protocol handler and leave everybody else put of it.
string versionString = parameterStatus.ParameterValue.Trim();
for (int idx = 0; idx != versionString.Length; ++idx)
{
char c = parameterStatus.ParameterValue[idx];
if (!char.IsDigit(c) && c != '.')
{
versionString = versionString.Substring(0, idx);
break;
}
}
context.ServerVersion = new Version(versionString);
}
break;
case BackEndMessageCode.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);
break;
case BackEndMessageCode.CopyInResponse:
// Enter COPY sub protocol and start pushing data to server
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyInResponse");
ChangeState(context, NpgsqlCopyInState.Instance);
PGUtil.ReadInt32(stream); // length redundant
context.CurrentState.StartCopy(context, ReadCopyHeader(stream));
yield break;
// Either StartCopy called us again to finish the operation or control should be passed for user to feed copy data
case BackEndMessageCode.CopyOutResponse:
// Enter COPY sub protocol and start pulling data from server
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyOutResponse");
ChangeState(context, NpgsqlCopyOutState.Instance);
PGUtil.ReadInt32(stream); // length redundant
context.CurrentState.StartCopy(context, ReadCopyHeader(stream));
yield break;
// Either StartCopy called us again to finish the operation or control should be passed for user to feed copy data
case BackEndMessageCode.CopyData:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyData");
Int32 len = PGUtil.ReadInt32(stream) - 4;
byte[] buf = new byte[len];
PGUtil.ReadBytes(stream, buf, 0, len);
context.Mediator.ReceivedCopyData = buf;
yield break; // read data from server one chunk at a time while staying in copy operation mode
case BackEndMessageCode.CopyDone:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyDone");
PGUtil.ReadInt32(stream); // CopyDone can not have content so this is always 4
// This will be followed by normal CommandComplete + ReadyForQuery so no op needed
break;
case BackEndMessageCode.IO_ERROR:
// Connection broken. Mono returns -1 instead of throwing 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));
}
}
}
}
public void AddParameterStatus(NpgsqlParameterStatus ps)
{
if (_serverParameters.ContainsKey(ps.Parameter))
{
_serverParameters[ps.Parameter] = ps;
}
else
{
_serverParameters.Add(ps.Parameter, ps);
}
_useConformantStrings = null;
}
public void AddParameterStatus(NpgsqlParameterStatus ps)
{
if (_serverParameters.ContainsKey(ps.Parameter))
{
_serverParameters[ps.Parameter] = ps;
}
else
{
_serverParameters.Add(ps.Parameter, ps);
}
if (ps.Parameter == "standard_conforming_strings")
{
NativeToBackendTypeConverterOptions.UseConformantStrings = (ps.ParameterValue == "on");
}
}
public void AddParameterStatus(String Key, NpgsqlParameterStatus PS)
{
_parameters[Key] = PS;
}
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));
}
}
}
IServerMessage ReadMessageInternal()
{
for (;;)
{
// Check the first Byte of response.
Stream.Read(_buffer, 0, 1);
var message = (BackEndMessageCode) _buffer[0];
switch (message)
{
case BackEndMessageCode.ErrorResponse:
var error = new NpgsqlError(Stream);
_log.Trace("Received backend error: " + error.Message);
error.ErrorSql = Mediator.GetSqlSent();
// We normally accumulate errors until the query ends (ReadyForQuery). But
// during the connection phase errors need to be thrown immediately
// Possible error in the NpgsqlStartupState:
// Invalid password.
// Possible error in the NpgsqlConnectedState:
// No pg_hba.conf configured.
if (State == ConnectorState.Connecting) {
throw new NpgsqlException(error);
}
_pendingErrors.Add(error);
continue;
case BackEndMessageCode.AuthenticationRequest:
// Get the length in case we're getting AuthenticationGSSContinue
var authDataLength = Stream.ReadInt32() - 8;
var authType = (AuthenticationRequestType)Stream.ReadInt32();
_log.Trace("Received AuthenticationRequest of type " + authType);
switch (authType)
{
case AuthenticationRequestType.AuthenticationOk:
continue;
case AuthenticationRequestType.AuthenticationClearTextPassword:
// Send the PasswordPacket.
SendPasswordMessage(PGUtil.NullTerminateArray(Password));
continue;
case AuthenticationRequestType.AuthenticationMD5Password:
// 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
var md5 = MD5.Create();
// 1.
var passwd = Password;
var saltUserName = BackendEncoding.UTF8Encoding.GetBytes(UserName);
var cryptBuf = new byte[passwd.Length + saltUserName.Length];
passwd.CopyTo(cryptBuf, 0);
saltUserName.CopyTo(cryptBuf, passwd.Length);
var sb = new StringBuilder();
var hashResult = md5.ComputeHash(cryptBuf);
foreach (byte b in hashResult)
{
sb.Append(b.ToString("x2"));
}
var prehash = sb.ToString();
var prehashbytes = BackendEncoding.UTF8Encoding.GetBytes(prehash);
cryptBuf = new byte[prehashbytes.Length + 4];
Stream.Read(cryptBuf, prehashbytes.Length, 4);
// Send the PasswordPacket.
// 2.
prehashbytes.CopyTo(cryptBuf, 0);
sb = new StringBuilder("md5");
// This is needed as the backend expects md5 result starts with "md5"
hashResult = md5.ComputeHash(cryptBuf);
foreach (var b in hashResult)
{
sb.Append(b.ToString("x2"));
}
SendPasswordMessage(PGUtil.NullTerminateArray(BackendEncoding.UTF8Encoding.GetBytes(sb.ToString())));
continue;
case AuthenticationRequestType.AuthenticationGSS:
{
if (IntegratedSecurity)
{
// For GSSAPI we have to use the supplied hostname
SSPI = new SSPIHandler(Host, "POSTGRES", true);
SendPasswordMessage(SSPI.Continue(null));
continue;
}
else
{
// TODO: correct exception
throw new Exception();
}
}
case AuthenticationRequestType.AuthenticationSSPI:
{
if (IntegratedSecurity)
{
// For SSPI we have to get the IP-Address (hostname doesn't work)
var ipAddressString = ((IPEndPoint)Socket.RemoteEndPoint).Address.ToString();
SSPI = new SSPIHandler(ipAddressString, "POSTGRES", false);
SendPasswordMessage(SSPI.Continue(null));
continue;
}
else
{
// TODO: correct exception
throw new Exception();
}
}
case AuthenticationRequestType.AuthenticationGSSContinue:
{
var authData = new byte[authDataLength];
Stream.CheckedStreamRead(authData, 0, authDataLength);
var passwdRead = SSPI.Continue(authData);
if (passwdRead.Length != 0)
{
SendPasswordMessage(passwdRead);
}
continue;
}
default:
throw new NotSupportedException(String.Format(L10N.AuthenticationMethodNotSupported, authType));
}
case BackEndMessageCode.RowDescription:
_log.Trace("Received RowDescription");
return new NpgsqlRowDescription(Stream, OidToNameMapping);
case BackEndMessageCode.ParameterDescription:
_log.Trace("Received ParameterDescription");
// PostgreSQL has found out what parameter types we must use
Stream.ReadInt32();
var nbParam = Stream.ReadInt16();
var typeoids = new int[nbParam];
for (var i = 0; i < nbParam; i++)
{
typeoids[i] = Stream.ReadInt32(); // typeoid
}
return new ParameterDescriptionResponse(typeoids);
case BackEndMessageCode.DataRow:
_log.Trace("Received DataRow");
State = ConnectorState.Fetching;
return new StringRowReader(Stream);
case BackEndMessageCode.ReadyForQuery:
_log.Trace("Received 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.
Stream.ReadInt32();
Stream.ReadByte();
State = ConnectorState.Ready;
if (_pendingErrors.Any()) {
var e = new NpgsqlException(_pendingErrors);
_pendingErrors.Clear();
throw e;
}
return ReadyForQueryMsg.Instance;
case BackEndMessageCode.BackendKeyData:
_log.Trace("Received BackendKeyData");
BackEndKeyData = new NpgsqlBackEndKeyData(Stream);
// Wait for ReadForQuery message
continue;
case BackEndMessageCode.NoticeResponse:
_log.Trace("Received NoticeResponse");
// Notices and errors are identical except that we
// just throw notices away completely ignored.
FireNotice(new NpgsqlError(Stream));
continue;
case BackEndMessageCode.CompletedResponse:
_log.Trace("Received CompletedResponse");
Stream.ReadInt32();
return new CompletedResponse(Stream);
case BackEndMessageCode.ParseComplete:
_log.Trace("Received ParseComplete");
// Just read up the message length.
Stream.ReadInt32();
continue;
case BackEndMessageCode.BindComplete:
_log.Trace("Received BindComplete");
// Just read up the message length.
Stream.ReadInt32();
continue;
case BackEndMessageCode.EmptyQueryResponse:
_log.Trace("Received EmptyQueryResponse");
Stream.ReadInt32();
continue;
case BackEndMessageCode.NotificationResponse:
_log.Trace("Received NotificationResponse");
// Eat the length
Stream.ReadInt32();
FireNotification(new NpgsqlNotificationEventArgs(Stream, true));
if (IsNotificationThreadRunning) {
throw new Exception("Internal state error, notification thread is running");
}
continue;
case BackEndMessageCode.ParameterStatus:
var paramStatus = new NpgsqlParameterStatus(Stream);
_log.TraceFormat("Received ParameterStatus {0}={1}", paramStatus.Parameter, paramStatus.ParameterValue);
AddParameterStatus(paramStatus);
if (paramStatus.Parameter == "server_version")
{
// Deal with this here so that if there are
// changes in a future backend version, we can handle it here in the
// protocol handler and leave everybody else put of it.
var versionString = paramStatus.ParameterValue.Trim();
for (var idx = 0; idx != versionString.Length; ++idx)
{
var c = paramStatus.ParameterValue[idx];
if (!char.IsDigit(c) && c != '.')
{
versionString = versionString.Substring(0, idx);
break;
}
}
ServerVersion = new Version(versionString);
}
continue;
case BackEndMessageCode.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.
_log.Trace("Received NoData");
Stream.ReadInt32();
continue;
case BackEndMessageCode.CopyInResponse:
_log.Trace("Received CopyInResponse");
// Enter COPY sub protocol and start pushing data to server
State = ConnectorState.CopyIn;
Stream.ReadInt32(); // length redundant
StartCopyIn(ReadCopyHeader());
return CopyInResponseMsg.Instance;
// Either StartCopy called us again to finish the operation or control should be passed for user to feed copy data
case BackEndMessageCode.CopyOutResponse:
_log.Trace("Received CopyOutResponse");
// Enter COPY sub protocol and start pulling data from server
State = ConnectorState.CopyOut;
Stream.ReadInt32(); // length redundant
StartCopyOut(ReadCopyHeader());
return CopyOutResponseMsg.Instance;
// Either StartCopy called us again to finish the operation or control should be passed for user to feed copy data
case BackEndMessageCode.CopyData:
_log.Trace("Received CopyData");
var len = Stream.ReadInt32() - 4;
var buf = new byte[len];
Stream.ReadBytes(buf, 0, len);
Mediator.ReceivedCopyData = buf;
return CopyDataMsg.Instance;
// read data from server one chunk at a time while staying in copy operation mode
case BackEndMessageCode.CopyDone:
_log.Trace("Received CopyDone");
Stream.ReadInt32(); // CopyDone can not have content so this is always 4
// This will be followed by normal CommandComplete + ReadyForQuery so no op needed
continue;
case BackEndMessageCode.IO_ERROR:
// Connection broken. Mono returns -1 instead of throwing 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 IEnumerable <IServerResponseObject> ProcessBackendResponses_Ver_3(NpgsqlConnector context)
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ProcessBackendResponses");
using (new ContextResetter(context))
{
Stream stream = context.Stream;
NpgsqlMediator mediator = context.Mediator;
NpgsqlRowDescription lastRowDescription = null;
List <NpgsqlError> errors = new List <NpgsqlError>();
for (;;)
{
// Check the first Byte of response.
BackEndMessageCode message = (BackEndMessageCode)stream.ReadByte();
switch (message)
{
case BackEndMessageCode.ErrorResponse:
NpgsqlError error = new NpgsqlError(context.BackendProtocolVersion, stream);
error.ErrorSql = mediator.SqlSent;
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 (!context.RequireReadyForQuery)
{
throw new NpgsqlException(errors);
}
break;
case BackEndMessageCode.AuthenticationRequest:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "AuthenticationRequest");
// Get the length in case we're getting AuthenticationGSSContinue
int authDataLength = PGUtil.ReadInt32(stream) - 8;
AuthenticationRequestType authType = (AuthenticationRequestType)PGUtil.ReadInt32(stream);
switch (authType)
{
case AuthenticationRequestType.AuthenticationOk:
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationOK", LogLevel.Debug);
break;
case AuthenticationRequestType.AuthenticationClearTextPassword:
NpgsqlEventLog.LogMsg(resman, "Log_AuthenticationClearTextRequest", LogLevel.Debug);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
context.Authenticate(context.Password);
break;
case AuthenticationRequestType.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.Password;
byte[] saltUserName = ENCODING_UTF8.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 = ENCODING_UTF8.GetBytes(prehash);
crypt_buf = new byte[prehashbytes.Length + 4];
stream.Read(crypt_buf, prehashbytes.Length, 4);
// Send the PasswordPacket.
ChangeState(context, NpgsqlStartupState.Instance);
// 2.
prehashbytes.CopyTo(crypt_buf, 0);
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(ENCODING_UTF8.GetBytes(sb.ToString()));
break;
#if WINDOWS && UNMANAGED
case AuthenticationRequestType.AuthenticationSSPI:
{
if (context.IntegratedSecurity)
{
// For SSPI we have to get the IP-Address (hostname doesn't work)
string ipAddressString = ((IPEndPoint)context.Socket.RemoteEndPoint).Address.ToString();
context.SSPI = new SSPIHandler(ipAddressString, "POSTGRES");
ChangeState(context, NpgsqlStartupState.Instance);
context.Authenticate(context.SSPI.Continue(null));
break;
}
else
{
// TODO: correct exception
throw new Exception();
}
}
case AuthenticationRequestType.AuthenticationGSSContinue:
{
byte[] authData = new byte[authDataLength];
PGUtil.CheckedStreamRead(stream, authData, 0, authDataLength);
byte[] passwd_read = context.SSPI.Continue(authData);
if (passwd_read.Length != 0)
{
context.Authenticate(passwd_read);
}
break;
}
#endif
default:
// Only AuthenticationClearTextPassword and AuthenticationMD5Password supported for now.
errors.Add(
new NpgsqlError(context.BackendProtocolVersion,
String.Format(resman.GetString("Exception_AuthenticationMethodNotSupported"), authType)));
throw new NpgsqlException(errors);
}
break;
case BackEndMessageCode.RowDescription:
yield return(lastRowDescription = new NpgsqlRowDescriptionV3(stream, context.OidToNameMapping, context.CompatVersion));
break;
case BackEndMessageCode.ParameterDescription:
// Do nothing,for instance, just read...
int lenght = PGUtil.ReadInt32(stream);
int nb_param = PGUtil.ReadInt16(stream);
for (int i = 0; i < nb_param; i++)
{
int typeoid = PGUtil.ReadInt32(stream);
}
break;
case BackEndMessageCode.DataRow:
yield return(new ForwardsOnlyRow(new StringRowReaderV3(lastRowDescription, stream)));
break;
case BackEndMessageCode.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);
stream.ReadByte();
ChangeState(context, NpgsqlReadyState.Instance);
if (errors.Count != 0)
{
throw new NpgsqlException(errors);
}
yield break;
case BackEndMessageCode.BackendKeyData:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BackendKeyData");
// BackendKeyData message.
NpgsqlBackEndKeyData backend_keydata = new NpgsqlBackEndKeyData(context.BackendProtocolVersion, stream);
context.BackEndKeyData = backend_keydata;
// Wait for ReadForQuery message
break;
case BackEndMessageCode.NoticeResponse:
// Notices and errors are identical except that we
// just throw notices away completely ignored.
context.FireNotice(new NpgsqlError(context.BackendProtocolVersion, stream));
break;
case BackEndMessageCode.CompletedResponse:
PGUtil.ReadInt32(stream);
yield return(new CompletedResponse(stream));
break;
case BackEndMessageCode.ParseComplete:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParseComplete");
// Just read up the message length.
PGUtil.ReadInt32(stream);
yield break;
case BackEndMessageCode.BindComplete:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "BindComplete");
// Just read up the message length.
PGUtil.ReadInt32(stream);
yield break;
case BackEndMessageCode.EmptyQueryResponse:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "EmptyQueryResponse");
PGUtil.ReadInt32(stream);
break;
case BackEndMessageCode.NotificationResponse:
// Eat the length
PGUtil.ReadInt32(stream);
context.FireNotification(new NpgsqlNotificationEventArgs(stream, true));
if (context.IsNotificationThreadRunning)
{
yield break;
}
break;
case BackEndMessageCode.ParameterStatus:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "ParameterStatus");
NpgsqlParameterStatus parameterStatus = new NpgsqlParameterStatus(stream);
NpgsqlEventLog.LogMsg(resman, "Log_ParameterStatus", LogLevel.Debug, parameterStatus.Parameter,
parameterStatus.ParameterValue);
context.AddParameterStatus(parameterStatus);
if (parameterStatus.Parameter == "server_version")
{
// Deal with this here so that if there are
// changes in a future backend version, we can handle it here in the
// protocol handler and leave everybody else put of it.
string versionString = parameterStatus.ParameterValue.Trim();
for (int idx = 0; idx != versionString.Length; ++idx)
{
char c = parameterStatus.ParameterValue[idx];
if (!char.IsDigit(c) && c != '.')
{
versionString = versionString.Substring(0, idx);
break;
}
}
context.ServerVersion = new Version(versionString);
}
break;
case BackEndMessageCode.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);
break;
case BackEndMessageCode.CopyInResponse:
// Enter COPY sub protocol and start pushing data to server
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyInResponse");
ChangeState(context, NpgsqlCopyInState.Instance);
PGUtil.ReadInt32(stream); // length redundant
context.CurrentState.StartCopy(context, ReadCopyHeader(stream));
yield break;
// Either StartCopy called us again to finish the operation or control should be passed for user to feed copy data
case BackEndMessageCode.CopyOutResponse:
// Enter COPY sub protocol and start pulling data from server
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyOutResponse");
ChangeState(context, NpgsqlCopyOutState.Instance);
PGUtil.ReadInt32(stream); // length redundant
context.CurrentState.StartCopy(context, ReadCopyHeader(stream));
yield break;
// Either StartCopy called us again to finish the operation or control should be passed for user to feed copy data
case BackEndMessageCode.CopyData:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyData");
Int32 len = PGUtil.ReadInt32(stream) - 4;
byte[] buf = new byte[len];
PGUtil.ReadBytes(stream, buf, 0, len);
context.Mediator.ReceivedCopyData = buf;
yield break; // read data from server one chunk at a time while staying in copy operation mode
case BackEndMessageCode.CopyDone:
NpgsqlEventLog.LogMsg(resman, "Log_ProtocolMessage", LogLevel.Debug, "CopyDone");
PGUtil.ReadInt32(stream); // CopyDone can not have content so this is always 4
// This will be followed by normal CommandComplete + ReadyForQuery so no op needed
break;
case BackEndMessageCode.IO_ERROR:
// Connection broken. Mono returns -1 instead of throwing 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));
}
}
}
}
