root/trunk/src/game/WorldSocket.cpp @ 13

/* 
 * Copyright (C) 2005-2008 MaNGOS <http://www.mangosproject.org/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "Common.h"
#include "WorldSocket.h" 
#include <ace/Message_Block.h>
#include <ace/OS_NS_string.h>
#include <ace/OS_NS_unistd.h>
#include <ace/os_include/arpa/os_inet.h>
#include <ace/os_include/netinet/os_tcp.h>
#include <ace/os_include/sys/os_types.h>
#include <ace/os_include/sys/os_socket.h>
#include <ace/OS_NS_string.h>
#include <ace/Reactor.h>
#include <ace/Auto_Ptr.h>

#include "Util.h"
#include "World.h"
#include "WorldPacket.h"
#include "SharedDefines.h"
#include "ByteBuffer.h"
#include "AddonHandler.h"
#include "Opcodes.h"
#include "Database/DatabaseEnv.h"
#include "Auth/Sha1.h"
#include "WorldSession.h"
#include "WorldSocketMgr.h"
#include "Log.h"
#include "WorldLog.h"

#if defined( __GNUC__ )
#pragma pack(1)
#else
#pragma pack(push,1)
#endif

struct ServerPktHeader
{
  ACE_UINT16 size;
  ACE_UINT16 cmd;
};

struct ClientPktHeader
{
  ACE_UINT16 size;
  ACE_UINT32 cmd;
};

#if defined( __GNUC__ )
#pragma pack()
#else
#pragma pack(pop)
#endif

// used when testing to alow login without password and encryption
// #define _NETCODE_FAKE_AUTH

WorldSocket::WorldSocket (void) :
WorldHandler (),
m_Session (0),
m_RecvWPct (0),
m_RecvPct (),
m_Header (sizeof (ClientPktHeader)),
m_OutBuffer (0),
m_OutBufferSize (65536),
m_OutActive (false),
m_Seed (static_cast<uint32> (rand32 ())),
m_OverSpeedPings (0),
m_LastPingTime (ACE_Time_Value::zero)
{
  this->reference_counting_policy ().value (ACE_Event_Handler::Reference_Counting_Policy::ENABLED);
}

WorldSocket::~WorldSocket (void)
{
  if (m_RecvWPct)
    delete m_RecvWPct;

  if (m_OutBuffer)
    m_OutBuffer->release ();

  this->closing_ = true;

  this->peer ().close ();

  WorldPacket* pct;
  while (m_PacketQueue.dequeue_head (pct) == 0)
    delete pct;
}

bool
WorldSocket::IsClosed (void) const
{
  return this->closing_;
}

void
WorldSocket::CloseSocket (void)
{
  {
    ACE_GUARD (LockType, Guard, m_OutBufferLock);

    if (this->closing_)
      return;

    this->closing_ = true;

    this->peer ().close_writer ();
  }

  {
    ACE_GUARD (LockType, Guard, m_SessionLock);

    m_Session = NULL;
  }

}

const std::string&
WorldSocket::GetRemoteAddress (void) const
{
  return m_Address;
}

int
WorldSocket::SendPacket (const WorldPacket& pct)
{
  ACE_GUARD_RETURN (LockType, Guard, m_OutBufferLock, -1);

  if (this->closing_)
    return -1;

  // Dump outgoing packet.
  if (sWorldLog.LogWorld ())
    {
      sWorldLog.Log ("SERVER:\nSOCKET: %u\nLENGTH: %u\nOPCODE: %s (0x%.4X)\nDATA:\n",
                     (uint32) get_handle (),
                     pct.size (),
                     LookupOpcodeName (pct.GetOpcode ()),
                     pct.GetOpcode ());

      uint32 p = 0;
      while (p < pct.size ())
        {
          for (uint32 j = 0; j < 16 && p < pct.size (); j++)
            sWorldLog.Log ("%.2X ", const_cast<WorldPacket&>(pct)[p++]);

          sWorldLog.Log ("\n");
        }

      sWorldLog.Log ("\n\n");
    }

  if (iSendPacket (pct) == -1)
    {
      WorldPacket* npct;

      ACE_NEW_RETURN (npct, WorldPacket (pct), -1);

      // NOTE maybe check of the size of the queue can be good ?
      // to make it bounded instead of unbounded
      if (m_PacketQueue.enqueue_tail (npct) == -1)
        {
          delete npct;
          sLog.outError ("WorldSocket::SendPacket: m_PacketQueue.enqueue_tail failed");
          return -1;
        }
    }

  return 0;
}

long
WorldSocket::AddReference (void)
{
  return static_cast<long> (this->add_reference ());
}

long
WorldSocket::RemoveReference (void)
{
  return static_cast<long> (this->remove_reference ());
}

int
WorldSocket::open (void *a)
{
  ACE_UNUSED_ARG (a);

  // Prevent double call to this func.
  if (m_OutBuffer)
    return -1;

  // This will also prevent the socket from being Updated
  // while we are initializing it.
  m_OutActive = true;

  // Hook for the manager.
  if (sWorldSocketMgr->OnSocketOpen (this) == -1)
    return -1;

  // Allocate the buffer.
  ACE_NEW_RETURN (m_OutBuffer, ACE_Message_Block (m_OutBufferSize), -1);

  // Store peer address.
  ACE_INET_Addr remote_addr;

  if (this->peer ().get_remote_addr (remote_addr) == -1)
    {
      sLog.outError ("WorldSocket::open: peer ().get_remote_addr errno = %s", ACE_OS::strerror (errno));
      return -1;
    }

  m_Address = remote_addr.get_host_addr ();

  // Send startup packet.
  WorldPacket packet (SMSG_AUTH_CHALLENGE, 4);
  packet << m_Seed;

  if (SendPacket (packet) == -1)
    return -1;

  // Register with ACE Reactor
  if (this->reactor ()->register_handler
      (this,
       ACE_Event_Handler::READ_MASK | ACE_Event_Handler::WRITE_MASK) == -1)
    {
      sLog.outError ("WorldSocket::open: unable to register client handler errno = %s", ACE_OS::strerror (errno));
      return -1;
    }

  // reactor takes care of the socket from now on
  this->remove_reference ();

  return 0;
}

int
WorldSocket::close (int)
{
  this->shutdown ();

  this->closing_ = true;

  this->remove_reference ();

  return 0;
}

int
WorldSocket::handle_input (ACE_HANDLE)
{
  if (this->closing_)
    return -1;

  switch (this->handle_input_missing_data ())
    {
    case -1 :
      {
        if ((errno == EWOULDBLOCK) ||
            (errno == EAGAIN))
          {
            //return 0;
            return this->Update (); // interesting line ,isnt it ?
          }

        DEBUG_LOG ("WorldSocket::handle_input: Peer error closing connection errno = %s", ACE_OS::strerror (errno));

        return -1;
      }
    case 0:
      {
        DEBUG_LOG ("WorldSocket::handle_input: Peer has closed connection\n");

        errno = ECONNRESET;

        return -1;
      }
    case 1:
      return 1;
    }

  //return 0;
  return this->Update (); // another interesting line ;)
}

int
WorldSocket::handle_output (ACE_HANDLE)
{
  ACE_GUARD_RETURN (LockType, Guard, m_OutBufferLock, -1);

  if (this->closing_)
    return -1;

  const size_t send_len = m_OutBuffer->length ();

  if (send_len == 0)
    return this->cancel_wakeup_output (Guard);
  
// TODO SO_NOSIGPIPE on platforms that support it
#ifdef MSG_NOSIGNAL
  ssize_t n = this->peer ().send (m_OutBuffer->rd_ptr (), send_len, MSG_NOSIGNAL);
#else
  ssize_t n = this->peer ().send (m_OutBuffer->rd_ptr (), send_len);
#endif // MSG_NOSIGNAL
          
  if (n == 0)
    return -1;
  else if (n == -1)
    {
      if (errno == EWOULDBLOCK || errno == EAGAIN)
        return this->schedule_wakeup_output (Guard);

      return -1;
    }
  else if (n < send_len) //now n > 0
    {
      m_OutBuffer->rd_ptr (static_cast<size_t> (n));

      // move the data to the base of the buffer
      m_OutBuffer->crunch ();

      return this->schedule_wakeup_output (Guard);
    }
  else //now n == send_len
    {
      m_OutBuffer->reset ();

      if (!iFlushPacketQueue ())
        return this->cancel_wakeup_output (Guard);
      else
        return this->schedule_wakeup_output (Guard);
    }

  ACE_NOTREACHED (return 0);
}

int
WorldSocket::handle_close (ACE_HANDLE h, ACE_Reactor_Mask)
{
  // Critical section
  {
    ACE_GUARD_RETURN (LockType, Guard, m_OutBufferLock, -1);

    this->closing_ = true;

    if (h == ACE_INVALID_HANDLE)
      this->peer ().close_writer ();
  }

  // Critical section
  {
    ACE_GUARD_RETURN (LockType, Guard, m_SessionLock, -1);

    m_Session = NULL;
  }

  return 0;
}

int
WorldSocket::Update (void)
{
  if (this->closing_)
    return -1;

  if (m_OutActive || m_OutBuffer->length () == 0)
    return 0;

  return this->handle_output (this->get_handle ());
}

int
WorldSocket::handle_input_header (void)
{
  ACE_ASSERT (m_RecvWPct == NULL);

  if (m_Header.length () != sizeof (ClientPktHeader))
    {
      sLog.outError ("WorldSocket::handle_input_header: internal error: invalid header");
      errno = EINVAL;
      return -1;
    }

  m_Crypt.DecryptRecv ((ACE_UINT8*) m_Header.rd_ptr (), sizeof (ClientPktHeader));

  ClientPktHeader& header = *((ClientPktHeader*) m_Header.rd_ptr ());

  header.size = ACE_NTOHS (header.size);

#if ACE_BYTE_ORDER == ACE_BIG_ENDIAN
  header.cmd = ACE_SWAP_LONG (header.cmd)
#endif // ACE_BIG_ENDIAN

  if ((header.size < 4) ||
      (header.size > 10240) ||
      (header.cmd <= 0) ||
      (header.cmd > 10240)
      )
    {
      sLog.outError ("WorldSocket::handle_input_header: client sent mailformed packet size = %d , cmd = %d",
                     header.size,
                     header.cmd);

      errno = EINVAL;
      return -1;
    }

  header.size -= 4;

  ACE_NEW_RETURN (m_RecvWPct, WorldPacket ((uint16) header.cmd, header.size), -1);

  if(header.size > 0)
  {
     m_RecvWPct->resize (header.size);  
     m_RecvPct.base ((char*) m_RecvWPct->contents (), m_RecvWPct->size ());
  }
  else
  {
     ACE_ASSERT(m_RecvPct.space() == 0);
  }


  return 0;
}

int
WorldSocket::handle_input_payload (void)
{
  // set errno properly here on error !!!
  // now have a header and payload

  ACE_ASSERT (m_RecvPct.space () == 0);
  ACE_ASSERT (m_Header.space () == 0);
  ACE_ASSERT (m_RecvWPct != NULL);

  const int ret = this->ProcessIncoming (m_RecvWPct);

  m_RecvPct.base (NULL, 0);
  m_RecvPct.reset ();
  m_RecvWPct = NULL;

  m_Header.reset ();

  if (ret == -1)
    errno = EINVAL;

  return ret;
}

int
WorldSocket::handle_input_missing_data (void)
{
  char buf [1024];

  ACE_Data_Block db (sizeof (buf),
                     ACE_Message_Block::MB_DATA,
                     buf,
                     0,
                     0,
                     ACE_Message_Block::DONT_DELETE,
                     0);

  ACE_Message_Block message_block (&db,
                                   ACE_Message_Block::DONT_DELETE,
                                   0);

  const size_t recv_size = message_block.space ();

  const ssize_t n = this->peer ().recv (message_block.wr_ptr (),
                                        recv_size);

  if (n <= 0)
    return n;

  message_block.wr_ptr (n);

  while (message_block.length () > 0)
    {
      if (m_Header.space () > 0)
        {
          //need to recieve the header
          const size_t to_header = (message_block.length () > m_Header.space () ? m_Header.space () : message_block.length ());
          m_Header.copy (message_block.rd_ptr (), to_header);
          message_block.rd_ptr (to_header);

          if (m_Header.space () > 0)
            {
              //couldnt recieve the whole header this time
              ACE_ASSERT (message_block.length () == 0);
              errno = EWOULDBLOCK;
              return -1;
            }

          //we just recieved nice new header
          if (this->handle_input_header () == -1)
            {
              ACE_ASSERT ((errno != EWOULDBLOCK) && (errno != EAGAIN));
              return -1;
            }
        }

      // Its possible on some error situations that this happens
      // for example on closing when epoll recieves more chunked data and stuff
      // hope this is not hack ,as proper m_RecvWPct is asserted around
      if (!m_RecvWPct)
        {
          sLog.outError ("Forsing close on input m_RecvWPct = NULL");
          errno = EINVAL;
          return -1;
        }

      // We have full readed header, now check the data payload
      if (m_RecvPct.space () > 0)
        {
          //need more data in the payload
          const size_t to_data = (message_block.length () > m_RecvPct.space () ? m_RecvPct.space () : message_block.length ());
          m_RecvPct.copy (message_block.rd_ptr (), to_data);
          message_block.rd_ptr (to_data);

          if (m_RecvPct.space () > 0)
            {
              //couldnt recieve the whole data this time
              ACE_ASSERT (message_block.length () == 0);
              errno = EWOULDBLOCK;
              return -1;
            }
        }

      //just recieved fresh new payload
      if (this->handle_input_payload () == -1)
        {
          ACE_ASSERT ((errno != EWOULDBLOCK) && (errno != EAGAIN));
          return -1;
        }
    }

  return n == recv_size ? 1 : 2;
}

int
WorldSocket::cancel_wakeup_output (GuardType& g)
{
  if (!m_OutActive)
    return 0;

  m_OutActive = false;

  g.release ();

  if (this->reactor ()->cancel_wakeup
      (this, ACE_Event_Handler::WRITE_MASK) == -1)
    {
      // would be good to store errno from reactor with errno guard
      sLog.outError ("WorldSocket::cancel_wakeup_output");
      return -1;
    }

  return 0;
}

int
WorldSocket::schedule_wakeup_output (GuardType& g)
{
  if (m_OutActive)
    return 0;

  m_OutActive = true;

  g.release ();

  if (this->reactor ()->schedule_wakeup
      (this, ACE_Event_Handler::WRITE_MASK) == -1)
    {
      sLog.outError ("WorldSocket::schedule_wakeup_output");
      return -1;
    }

  return 0;
}

int
WorldSocket::ProcessIncoming (WorldPacket* new_pct)
{
  ACE_ASSERT (new_pct);
  
  // manage memory ;)
  ACE_Auto_Ptr<WorldPacket> aptr (new_pct);

  const ACE_UINT16 opcode = new_pct->GetOpcode ();

  if (this->closing_)
    return -1;

  // dump recieved packet
  if (sWorldLog.LogWorld ())
    {
      sWorldLog.Log ("CLIENT:\nSOCKET: %u\nLENGTH: %u\nOPCODE: %s (0x%.4X)\nDATA:\n",
                     (uint32) get_handle (),
                     new_pct->size (),
                     LookupOpcodeName (new_pct->GetOpcode ()),
                     new_pct->GetOpcode ());

      uint32 p = 0;
      while (p < new_pct->size ())
        {
          for (uint32 j = 0; j < 16 && p < new_pct->size (); j++)
            sWorldLog.Log ("%.2X ", (*new_pct)[p++]);
          sWorldLog.Log ("\n");
        }
      sWorldLog.Log ("\n\n");
    }

  // like one switch ;)
  if (opcode == CMSG_PING)
    {
      return HandlePing (*new_pct);
    }
  else if (opcode == CMSG_AUTH_SESSION)
    {
      if (m_Session)
        {
          sLog.outError ("WorldSocket::ProcessIncoming: Player send CMSG_AUTH_SESSION again");
          return -1;
        }

      return HandleAuthSession (*new_pct);
    }
  else if (opcode == CMSG_KEEP_ALIVE)
    {
      DEBUG_LOG ("CMSG_KEEP_ALIVE ,size: %d", new_pct->size ());

      return 0;
    }
  else
    {
      ACE_GUARD_RETURN (LockType, Guard, m_SessionLock, -1);

      if (m_Session != NULL)
        {
          // OK ,give the packet to WorldSession
          aptr.release ();
          // WARNINIG here we call it with locks held.
          // Its possible to cause deadlock if QueuePacket calls back
          m_Session->QueuePacket (new_pct);
          return 0;
        }
      else
        {
          sLog.outError ("WorldSocket::ProcessIncoming: Client not authed opcode = ", opcode);
          return -1;
        }
    }

  ACE_NOTREACHED (return 0);
}

int
WorldSocket::HandleAuthSession (WorldPacket& recvPacket)
{
  uint8 digest[20];
  uint32 clientSeed;
  uint32 unk2;
  uint32 BuiltNumberClient;
  uint32 id, security;
  bool tbc = false;
  LocaleConstant locale;
  std::string account;
  Sha1Hash sha1;
  BigNumber v, s, g, N, x, I;
  WorldPacket packet, SendAddonPacked;

  BigNumber K;

  if (recvPacket.size () < (4 + 4 + 1 + 4 + 20))
    {
      sLog.outError ("WorldSocket::HandleAuthSession: wrong packet size");
      return -1;
    }

  // Read the content of the packet
  recvPacket >> BuiltNumberClient; // for now no use
  recvPacket >> unk2;
  recvPacket >> account;

  if (recvPacket.size () < (4 + 4 + (account.size () + 1) + 4 + 20))
    {
      sLog.outError ("WorldSocket::HandleAuthSession: wrong packet size second check");
      return -1;
    }

  recvPacket >> clientSeed;
  recvPacket.read (digest, 20);

  DEBUG_LOG ("WorldSocket::HandleAuthSession: client %u, unk2 %u, account %s, clientseed %u",
             BuiltNumberClient,
             unk2,
             account.c_str (),
             clientSeed);

#if defined _NETCODE_FAKE_AUTH
  bool dontchechtheacc = false;
  uint8 digest_fake[sizeof (digest)];
  memset ((void*) digest_fake, '\0', sizeof (digest_fake));
  if (memcmp ((void*) digest, (void*) digest_fake, sizeof (digest_fake)) == 0)
    {
      dontchechtheacc = true;
    }
#endif //_NETCODE_FAKE_AUTH

  // Get the account information from the realmd database
  std::string safe_account = account; // Duplicate, else will screw the SHA hash verification below
  loginDatabase.escape_string (safe_account);
  // No SQL injection, username escaped.

  QueryResult *result =
          loginDatabase.PQuery ("SELECT "
                                "id, " //0
                                "gmlevel, " //1
                                "sessionkey, " //2
                                "last_ip, " //3
                                "locked, " //4
                                "sha_pass_hash, " //5
                                "v, " //6
                                "s, " //7
                                "tbc, " //8
                                "mutetime, " //9
                                "locale " //10
                                "FROM account "
                                "WHERE username = '%s'",
                                safe_account.c_str ());

  // Stop if the account is not found
  if (!result)
    {
      packet.Initialize (SMSG_AUTH_RESPONSE, 1);
      packet << uint8 (AUTH_UNKNOWN_ACCOUNT);

      SendPacket (packet);

      sLog.outError ("WorldSocket::HandleAuthSession: Sent Auth Response (unknown account).");
      return -1;
    }

  Field* fields = result->Fetch ();

  tbc = fields[8].GetUInt8 () && sWorld.getConfig (CONFIG_EXPANSION) > 0;

  N.SetHexStr ("894B645E89E1535BBDAD5B8B290650530801B18EBFBF5E8FAB3C82872A3E9BB7");
  g.SetDword (7);
  I.SetHexStr (fields[5].GetString ());

  //In case of leading zeros in the I hash, restore them
  uint8 mDigest[SHA_DIGEST_LENGTH];
  memset (mDigest, 0, SHA_DIGEST_LENGTH);

  if (I.GetNumBytes () <= SHA_DIGEST_LENGTH)
    memcpy (mDigest, I.AsByteArray (), I.GetNumBytes ());

  std::reverse (mDigest, mDigest + SHA_DIGEST_LENGTH);

  s.SetHexStr (fields[7].GetString ());
  sha1.UpdateData (s.AsByteArray (), s.GetNumBytes ());
  sha1.UpdateData (mDigest, SHA_DIGEST_LENGTH);
  sha1.Finalize ();
  x.SetBinary (sha1.GetDigest (), sha1.GetLength ());
  v = g.ModExp (x, N);

  const char* sStr = s.AsHexStr (); //Must be freed by OPENSSL_free()
  const char* vStr = v.AsHexStr (); //Must be freed by OPENSSL_free()
  const char* vold = fields[6].GetString ();

  DEBUG_LOG ("WorldSocket::HandleAuthSession: (s,v) check s: %s v_old: %s v_new: %s",
             sStr,
             vold,
             vStr);

  loginDatabase.PExecute ("UPDATE account "
                          "SET "
                          "v = '0', "
                          "s = '0' "
                          "WHERE username = '%s'",
                          safe_account.c_str ());

#if defined _NETCODE_FAKE_AUTH
  if (!dontchechtheacc)
    {
#endif
      if (!vold || strcmp (vStr, vold))
        {
          packet.Initialize (SMSG_AUTH_RESPONSE, 1);
          packet << uint8 (AUTH_UNKNOWN_ACCOUNT);
          SendPacket (packet);
          delete result;
          OPENSSL_free ((void*) sStr);
          OPENSSL_free ((void*) vStr);

          sLog.outError ("WorldSocket::HandleAuthSession: User not logged.");
          return -1;
        }
#if defined _NETCODE_FAKE_AUTH
    }
#endif

  OPENSSL_free ((void*) sStr);
  OPENSSL_free ((void*) vStr);

  ///- Re-check ip locking (same check as in realmd).
  if (fields[4].GetUInt8 () == 1) // if ip is locked
    {
      if (strcmp (fields[3].GetString (), GetRemoteAddress ().c_str ()))
        {
          packet.Initialize (SMSG_AUTH_RESPONSE, 1);
          packet << uint8 (AUTH_FAILED);
          SendPacket (packet);

          delete result;
          sLog.outError ("WorldSocket::HandleAuthSession: Sent Auth Response (Account IP differs).");
          return -1;
        }
    }

  id = fields[0].GetUInt32 ();
  security = fields[1].GetUInt16 ();
  K.SetHexStr (fields[2].GetString ());

  time_t mutetime = time_t (fields[9].GetUInt64 ());

  locale = LocaleConstant (fields[10].GetUInt8 ());
  if (locale >= MAX_LOCALE)
    locale = LOCALE_enUS;

  delete result;

#if defined _NETCODE_FAKE_AUTH
  if (!dontchechtheacc)
    {
#endif
      // Re-check account ban (same check as in realmd) 
      QueryResult *banresult =
              loginDatabase.PQuery ("SELECT "
                                    "bandate, "
                                    "unbandate "
                                    "FROM account_banned "
                                    "WHERE id = '%u' "
                                    "AND active = 1",
                                    id);

      if (banresult) // if account banned
        {
          packet.Initialize (SMSG_AUTH_RESPONSE, 1);
          packet << uint8 (AUTH_BANNED);
          SendPacket (packet);

          delete banresult;

          sLog.outError ("WorldSocket::HandleAuthSession: Sent Auth Response (Account banned).");
          return -1;
        }

      // Check locked state for server
      AccountTypes allowedAccountType = sWorld.GetPlayerSecurityLimit ();

      if (allowedAccountType > SEC_PLAYER && security < allowedAccountType)
        {
          WorldPacket Packet (SMSG_AUTH_RESPONSE, 1);
          Packet << uint8 (AUTH_UNAVAILABLE);

          SendPacket (packet);

          sLog.outBasic ("WorldSocket::HandleAuthSession: User tryes to login but his security level is not enough");
          return -1;
        }

      // Check that Key and account name are the same on client and server
      Sha1Hash sha;

      uint32 t = 0;
      uint32 seed = m_Seed;

      sha.UpdateData (account);
      sha.UpdateData ((uint8 *) & t, 4);
      sha.UpdateData ((uint8 *) & clientSeed, 4);
      sha.UpdateData ((uint8 *) & seed, 4);
      sha.UpdateBigNumbers (&K, NULL);
      sha.Finalize ();

      if (memcmp (sha.GetDigest (), digest, 20))
        {
          packet.Initialize (SMSG_AUTH_RESPONSE, 1);
          packet << uint8 (AUTH_FAILED);

          SendPacket (packet);

          sLog.outError ("WorldSocket::HandleAuthSession: Sent Auth Response (authentification failed).");
          return -1;
        }
#if defined _NETCODE_FAKE_AUTH
    }
#endif

  std::string address = this->GetRemoteAddress ();

  DEBUG_LOG ("WorldSocket::HandleAuthSession: Client '%s' authenticated successfully from %s.",
             account.c_str (),
             address.c_str ());

  // Update the last_ip in the database
  // No SQL injection, username escaped.
  loginDatabase.escape_string (address);

  loginDatabase.PExecute ("UPDATE account "
                          "SET last_ip = '%s' "
                          "WHERE username = '%s'",
                          address.c_str (),
                          safe_account.c_str ());

  // TODO protect here probably ?
  // Althought atm the socket is singlethreaded
  ACE_NEW_RETURN (m_Session, WorldSession (id, this, security, tbc, mutetime, locale), -1);

#if defined _NETCODE_FAKE_AUTH
  if (!dontchechtheacc)
    {
#endif
      this->m_Crypt.SetKey (&K);
      this->m_Crypt.Init ();
#if defined _NETCODE_FAKE_AUTH
    }
#endif

  // In case needed sometime the second arg is in microseconds 1 000 000 = 1 sec
  ACE_OS::sleep (ACE_Time_Value (0, 10000));

  // TODO error handling
  sWorld.AddSession (this->m_Session);

  // Create and send the Addon packet
  if (sAddOnHandler.BuildAddonPacket (&recvPacket, &SendAddonPacked))
    SendPacket (SendAddonPacked);

  return 0;
}

int
WorldSocket::HandlePing (WorldPacket& recvPacket)
{
  uint32 ping;
  uint32 latency;

  if (recvPacket.size () < 8)
    {
      sLog.outError ("WorldSocket::_HandlePing wrong packet size");
      return -1;
    }

  // Get the ping packet content
  recvPacket >> ping;
  recvPacket >> latency;

  if (m_LastPingTime == ACE_Time_Value::zero)
    m_LastPingTime = ACE_OS::gettimeofday (); // for 1st ping
  else
    {
      ACE_Time_Value cur_time = ACE_OS::gettimeofday ();
      ACE_Time_Value diff_time (cur_time);
      diff_time -= m_LastPingTime;
      m_LastPingTime = cur_time;

      if (diff_time < ACE_Time_Value (27))
        {
          ++m_OverSpeedPings;

          uint32 max_count = sWorld.getConfig (CONFIG_MAX_OVERSPEED_PINGS);

          if (max_count && m_OverSpeedPings > max_count)
            {
              ACE_GUARD_RETURN (LockType, Guard, m_SessionLock, -1);

              if (m_Session && m_Session->GetSecurity () == SEC_PLAYER)
                {
                  sLog.outError ("WorldSocket::HandlePing: Player kicked for "
                                 "overspeeded pings adress = %s",
                                 GetRemoteAddress ().c_str ());

                  return -1;
                }
            }
        }
      else
        m_OverSpeedPings = 0;
    }

  // critical section
  {
    ACE_GUARD_RETURN (LockType, Guard, m_SessionLock, -1);

    if (m_Session)
      m_Session->SetLatency (latency);
    else
      {
        sLog.outError ("WorldSocket::HandlePing: peer sent CMSG_PING, "
                       "but is not authenticated or got recently kicked,"
                       " adress = %s",
                       this->GetRemoteAddress ().c_str ());
        return -1;
      }
  }

  WorldPacket packet (SMSG_PONG, 4);
  packet << ping;
  return this->SendPacket (packet);
}

int
WorldSocket::iSendPacket (const WorldPacket& pct)
{
  if (m_OutBuffer->space () < pct.size () + sizeof (ServerPktHeader))
    {
      errno = ENOBUFS;
      return -1;
    }

  ServerPktHeader header;

  header.cmd = pct.GetOpcode ();

#if ACE_BYTE_ORDER == ACE_BIG_ENDIAN
  header.cmd = ACE_SWAP_WORD (header.cmd)
#endif
          
  header.size = (uint16) pct.size () + 2;
  header.size = ACE_HTONS (header.size);

  m_Crypt.EncryptSend ((uint8*) & header, sizeof (header));

  if (m_OutBuffer->copy ((char*) & header, sizeof (header)) == -1)
    ACE_ASSERT (false);

  if (!pct.empty ())
    if (m_OutBuffer->copy ((char*) pct.contents (), pct.size ()) == -1)
      ACE_ASSERT (false);

  return 0;
}

bool
WorldSocket::iFlushPacketQueue ()
{
  WorldPacket *pct;
  bool haveone = false;

  while (m_PacketQueue.dequeue_head (pct) == 0)
    {
      if (iSendPacket (*pct) == -1)
        {
          if (m_PacketQueue.enqueue_head (pct) == -1)
            {
              delete pct;
              sLog.outError ("WorldSocket::iFlushPacketQueue m_PacketQueue->enqueue_head");
              return false;
            }

          break;
        }
      else
        {
          haveone = true;
          delete pct;
        }
    }

  return haveone;
}