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//
// Mono.Data.Tds.Protocol.TdsComm.cs
//
// Author:
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) 2002 Tim Coleman
//
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace Mono.Data.Tds.Protocol {
internal sealed class TdsComm
{
#region Fields
NetworkStream stream;
int packetSize;
TdsPacketType packetType = TdsPacketType.None;
Encoding encoder;
string dataSource;
int commandTimeout;
int connectionTimeout;
byte[] outBuffer;
int outBufferLength;
int nextOutBufferIndex = 0;
byte[] inBuffer;
int inBufferLength;
int inBufferIndex = 0;
static int headerLength = 8;
byte[] tmpBuf = new byte[8];
byte[] resBuffer = new byte[256];
int packetsSent = 0;
int packetsReceived = 0;
Socket socket;
TdsVersion tdsVersion;
ManualResetEvent connected = new ManualResetEvent (false);
#endregion // Fields
#region Constructors
[MonoTODO ("Fix when asynchronous socket connect works on Linux.")]
public TdsComm (string dataSource, int port, int packetSize, int timeout, TdsVersion tdsVersion)
{
this.packetSize = packetSize;
this.tdsVersion = tdsVersion;
this.dataSource = dataSource;
this.connectionTimeout = timeout;
outBuffer = new byte[packetSize];
inBuffer = new byte[packetSize];
outBufferLength = packetSize;
inBufferLength = packetSize;
socket = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPHostEntry hostEntry = Dns.Resolve (dataSource);
IPEndPoint endPoint;
endPoint = new IPEndPoint (hostEntry.AddressList [0], port);
// This replaces the code below for now
socket.Connect (endPoint);
/*
FIXME: Asynchronous socket connection doesn't work right on linux, so comment
this out for now. This *does* do the right thing on windows
connected.Reset ();
IAsyncResult asyncResult = socket.BeginConnect (endPoint, new AsyncCallback (ConnectCallback), socket);
if (timeout > 0 && !connected.WaitOne (new TimeSpan (0, 0, timeout), true))
throw Tds.CreateTimeoutException (dataSource, "Open()");
else if (timeout > 0 && !connected.WaitOne ())
throw Tds.CreateTimeoutException (dataSource, "Open()");
*/
stream = new NetworkStream (socket);
}
#endregion // Constructors
#region Properties
public int CommandTimeout {
get { return commandTimeout; }
set { commandTimeout = value; }
}
internal Encoding Encoder {
set { encoder = value; }
}
public int PacketSize {
get { return packetSize; }
set { packetSize = value; }
}
#endregion // Properties
#region Methods
public void Append (object o)
{
switch (o.GetType ().ToString ()) {
case "System.Byte":
Append ((byte) o);
return;
case "System.Byte[]":
Append ((byte[]) o);
return;
case "System.Int16":
Append ((short) o);
return;
case "System.Int32":
Append ((int) o);
return;
case "System.String":
Append ((string) o);
return;
case "System.Double":
Append ((double) o);
return;
case "System.Int64":
Append ((long) o);
return;
}
}
public void Append (byte b)
{
if (nextOutBufferIndex == outBufferLength) {
SendPhysicalPacket (false);
nextOutBufferIndex = headerLength;
}
Store (nextOutBufferIndex, b);
nextOutBufferIndex++;
}
public void Append (byte[] b)
{
Append (b, b.Length, (byte) 0);
}
public void Append (byte[] b, int len, byte pad)
{
int i = 0;
for ( ; i < b.Length && i < len; i++)
Append (b[i]);
for ( ; i < len; i++)
Append (pad);
}
public void Append (short s)
{
Append (BitConverter.GetBytes (s));
}
public void Append (int i)
{
Append (BitConverter.GetBytes (i));
}
public void Append (string s)
{
if (tdsVersion < TdsVersion.tds70)
Append (encoder.GetBytes (s));
else
foreach (char c in s)
Append (BitConverter.GetBytes (c));
}
// Appends with padding
public byte[] Append (string s, int len, byte pad)
{
if (s == null)
return new byte[0];
byte[] result = encoder.GetBytes (s);
Append (result, len, pad);
return result;
}
public void Append (double value)
{
Append (BitConverter.DoubleToInt64Bits (value));
}
public void Append (long l)
{
if (tdsVersion < TdsVersion.tds70) {
Append ((byte) (((byte) (l >> 56)) & 0xff));
Append ((byte) (((byte) (l >> 48)) & 0xff));
Append ((byte) (((byte) (l >> 40)) & 0xff));
Append ((byte) (((byte) (l >> 32)) & 0xff));
Append ((byte) (((byte) (l >> 24)) & 0xff));
Append ((byte) (((byte) (l >> 16)) & 0xff));
Append ((byte) (((byte) (l >> 8)) & 0xff));
Append ((byte) (((byte) (l >> 0)) & 0xff));
}
else
Append (BitConverter.GetBytes (l));
}
public void Close ()
{
stream.Close ();
}
private void ConnectCallback (IAsyncResult ar)
{
Socket s = (Socket) ar.AsyncState;
if (Poll (s, connectionTimeout, SelectMode.SelectWrite)) {
socket.EndConnect (ar);
connected.Set ();
}
}
public byte GetByte ()
{
byte result;
if (inBufferIndex >= inBufferLength) {
// out of data, read another physical packet.
GetPhysicalPacket ();
}
result = inBuffer[inBufferIndex++];
return result;
}
public byte[] GetBytes (int len, bool exclusiveBuffer)
{
byte[] result = null;
int i;
// Do not keep an internal result buffer larger than 16k.
// This would unnecessarily use up memory.
if (exclusiveBuffer || len > 16384)
result = new byte[len];
else
{
if (resBuffer.Length < len)
resBuffer = new byte[len];
result = resBuffer;
}
for (i = 0; i<len; )
{
if (inBufferIndex >= inBufferLength)
GetPhysicalPacket ();
int avail = inBufferLength - inBufferIndex;
avail = avail>len-i ? len-i : avail;
System.Array.Copy (inBuffer, inBufferIndex, result, i, avail);
i += avail;
inBufferIndex += avail;
}
return result;
}
public string GetString (int len)
{
if (tdsVersion == TdsVersion.tds70)
return GetString (len, true);
else
return GetString (len, false);
}
public string GetString (int len, bool wide)
{
if (wide) {
char[] chars = new char[len];
for (int i = 0; i < len; ++i) {
int lo = ((byte) GetByte ()) & 0xFF;
int hi = ((byte) GetByte ()) & 0xFF;
chars[i] = (char) (lo | ( hi << 8));
}
return new String (chars);
}
else {
byte[] result = new byte[len];
Array.Copy (GetBytes (len, false), result, len);
return (encoder.GetString (result));
}
}
public int GetNetShort ()
{
byte[] tmp = new byte[2];
tmp[0] = GetByte ();
tmp[1] = GetByte ();
return Ntohs (tmp, 0);
}
public short GetTdsShort ()
{
byte[] input = new byte[2];
for (int i = 0; i < 2; i += 1)
input[i] = GetByte ();
return (BitConverter.ToInt16 (input, 0));
}
public int GetTdsInt ()
{
byte[] input = new byte[4];
for (int i = 0; i < 4; i += 1)
input[i] = GetByte ();
return (BitConverter.ToInt32 (input, 0));
}
public long GetTdsInt64 ()
{
byte[] input = new byte[8];
for (int i = 0; i < 8; i += 1)
input[i] = GetByte ();
return (BitConverter.ToInt64 (input, 0));
}
private void GetPhysicalPacket ()
{
int nread = 0;
// read the header
while (nread < 8)
nread += stream.Read (tmpBuf, nread, 8 - nread);
TdsPacketType packetType = (TdsPacketType) tmpBuf[0];
if (packetType != TdsPacketType.Logon && packetType != TdsPacketType.Query && packetType != TdsPacketType.Reply)
{
throw new Exception (String.Format ("Unknown packet type {0}", tmpBuf[0]));
}
// figure out how many bytes are remaining in this packet.
int len = Ntohs (tmpBuf, 2) - 8;
if (len >= inBuffer.Length)
inBuffer = new byte[len];
if (len < 0) {
throw new Exception (String.Format ("Confused by a length of {0}", len));
}
// now get the data
nread = 0;
while (nread < len) {
nread += stream.Read (inBuffer, nread, len - nread);
}
packetsReceived++;
// adjust the bookkeeping info about the incoming buffer
inBufferLength = len;
inBufferIndex = 0;
}
private static int Ntohs (byte[] buf, int offset)
{
int lo = ((int) buf[offset + 1] & 0xff);
int hi = (((int) buf[offset] & 0xff ) << 8);
return hi | lo;
// return an int since we really want an _unsigned_
}
public byte Peek ()
{
// If out of data, read another physical packet.
if (inBufferIndex >= inBufferLength)
GetPhysicalPacket ();
return inBuffer[inBufferIndex];
}
public bool Poll (int seconds, SelectMode selectMode)
{
return Poll (socket, seconds, selectMode);
}
private bool Poll (Socket s, int seconds, SelectMode selectMode)
{
long uSeconds = seconds * 1000000;
bool bState = false;
while (uSeconds > (long) Int32.MaxValue) {
bState = s.Poll (Int32.MaxValue, selectMode);
if (bState)
return true;
uSeconds -= Int32.MaxValue;
}
return s.Poll ((int) uSeconds, selectMode);
}
internal void ResizeOutBuf (int newSize)
{
if (newSize > outBufferLength) {
byte[] newBuf = new byte [newSize];
Array.Copy (outBuffer, 0, newBuf, 0, outBufferLength);
outBufferLength = newSize;
outBuffer = newBuf;
}
}
public void SendPacket ()
{
SendPhysicalPacket (true);
nextOutBufferIndex = 0;
packetType = TdsPacketType.None;
}
private void SendPhysicalPacket (bool isLastSegment)
{
if (nextOutBufferIndex > headerLength || packetType == TdsPacketType.Cancel) {
// packet type
Store (0, (byte) packetType);
Store (1, (byte) (isLastSegment ? 1 : 0));
Store (2, (short) nextOutBufferIndex );
Store (4, (byte) 0);
Store (5, (byte) 0);
Store (6, (byte) (tdsVersion == TdsVersion.tds70 ? 0x1 : 0x0));
Store (7, (byte) 0);
stream.Write (outBuffer, 0, nextOutBufferIndex);
stream.Flush ();
packetsSent++;
}
}
public void Skip (int i)
{
for ( ; i > 0; i--)
GetByte ();
}
public void StartPacket (TdsPacketType type)
{
if (type != TdsPacketType.Cancel && inBufferIndex != inBufferLength)
inBufferIndex = inBufferLength;
packetType = type;
nextOutBufferIndex = headerLength;
}
private void Store (int index, byte value)
{
outBuffer[index] = value;
}
private void Store (int index, short value)
{
outBuffer[index] = (byte) (((byte) (value >> 8)) & 0xff);
outBuffer[index + 1] = (byte) (((byte) (value >> 0)) & 0xff);
}
#endregion // Methods
}
}
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