public bool AddServer(ED2KServer pServer, bool bAddTail)
{
if (!IsGoodServerIP(pServer))
{
// check for 0-IP, localhost and optionally for LAN addresses
return(false);
}
if (MuleApplication.Instance.Preference.IsFilterServerByIP)
{
// IP-Filter: We don't need to reject dynIP-servers here. After the DN was
// resolved, the IP will get filtered and the server will get removed. This applies
// for TCP-connections as well as for outgoing UDP-packets because for both protocols
// we resolve the DN and filter the received IP.
//if (pServer.HasDynIP())
// return false;
if (MuleApplication.Instance.IPFilter.IsFiltered(pServer.IP))
{
return(false);
}
}
ED2KServer pFoundServer = GetServerByAddress(pServer.Address, pServer.Port);
// Avoid duplicate (dynIP) servers: If the server which is to be added, is a dynIP-server
// but we don't know yet it's DN, we need to search for an already available server with
// that IP.
if (pFoundServer == null && pServer.IP != 0)
{
pFoundServer = GetServerByIPTCP(pServer.IP, pServer.Port);
}
if (pFoundServer != null)
{
pFoundServer.ResetFailedCount();
return(false);
}
if (bAddTail)
{
servers_.Add(pServer);
}
else
{
servers_.Insert(0, pServer);
}
return(true);
}
private bool ProcessPacket(byte[] buffer, int offset, int size, uint opcode, uint nIP, ushort nUDPPort)
{
try
{
MuleApplication.Instance.Statistics.AddDownDataOverheadServer((uint)size);
ED2KServer pServer = MuleApplication.Instance.ServerList.GetServerByIPUDP(nIP, nUDPPort, true);
if (pServer != null)
{
pServer.ResetFailedCount();
}
switch ((OperationCodeEnum)opcode)
{
case OperationCodeEnum.OP_GLOBSEARCHRES:
{
SafeMemFile data = MpdObjectManager.CreateSafeMemFile(buffer, size);
// process all search result packets
int iLeft;
do
{
uint uResultCount = MuleApplication.Instance.SearchList.ProcessUDPSearchAnswer(data, true /*pServer.GetUnicodeSupport()*/, nIP, nUDPPort - 4);
// check if there is another source packet
iLeft = (int)(data.Length - data.Position);
if (iLeft >= 2)
{
byte protocol = data.ReadUInt8();
iLeft--;
if (protocol != MuleConstants.PROTOCOL_EDONKEYPROT)
{
data.Seek(-1, System.IO.SeekOrigin.Current);
iLeft += 1;
break;
}
byte opcode1 = data.ReadUInt8();
iLeft--;
if (opcode1 != (byte)OperationCodeEnum.OP_GLOBSEARCHRES)
{
data.Seek(-2, System.IO.SeekOrigin.Current);
iLeft += 2;
break;
}
}
}while (iLeft > 0);
break;
}
case OperationCodeEnum.OP_GLOBFOUNDSOURCES:
{
SafeMemFile data = MpdObjectManager.CreateSafeMemFile(buffer, size);
// process all source packets
int iLeft;
do
{
byte[] fileid = new byte[16];
data.ReadHash16(fileid);
PartFile file = MuleApplication.Instance.DownloadQueue.GetFileByID(fileid);
if (file != null)
{
file.AddSources(data, nIP, (ushort)(nUDPPort - 4), false);
}
else
{
// skip sources for that file
uint count = data.ReadUInt8();
data.Seek(count * (4 + 2), System.IO.SeekOrigin.Current);
}
// check if there is another source packet
iLeft = (int)(data.Length - data.Position);
if (iLeft >= 2)
{
byte protocol = data.ReadUInt8();
iLeft--;
if (protocol != MuleConstants.PROTOCOL_EDONKEYPROT)
{
data.Seek(-1, System.IO.SeekOrigin.Current);
iLeft += 1;
break;
}
byte opcode1 = data.ReadUInt8();
iLeft--;
if (opcode1 != (byte)OperationCodeEnum.OP_GLOBFOUNDSOURCES)
{
data.Seek(-2, System.IO.SeekOrigin.Current);
iLeft += 2;
break;
}
}
}while (iLeft > 0);
break;
}
case OperationCodeEnum.OP_GLOBSERVSTATRES:
{
if (size < 12 || pServer == null)
{
return(true);
}
uint challenge = BitConverter.ToUInt32(buffer, 0);
if (challenge != pServer.Challenge)
{
return(true);
}
if (pServer != null)
{
pServer.Challenge = 0;
pServer.CryptPingReplyPending = false;
uint tNow = MpdUtilities.Time();
Random rand = new Random();
// if we used Obfuscated ping, we still need to reset the time properly
pServer.LastPingedTime =
Convert.ToUInt32(tNow - (rand.Next() % MuleConstants.ONE_HOUR_SEC));
}
uint cur_user = BitConverter.ToUInt32(buffer, 4);
uint cur_files = BitConverter.ToUInt32(buffer, 8);
uint cur_maxusers = 0;
uint cur_softfiles = 0;
uint cur_hardfiles = 0;
uint uUDPFlags = 0;
uint uLowIDUsers = 0;
uint dwServerUDPKey = 0;
ushort nTCPObfuscationPort = 0;
ushort nUDPObfuscationPort = 0;
if (size >= 16)
{
cur_maxusers = BitConverter.ToUInt32(buffer, 12);
}
if (size >= 24)
{
cur_softfiles = BitConverter.ToUInt32(buffer, 16);
cur_hardfiles = BitConverter.ToUInt32(buffer, 20);
}
if (size >= 28)
{
uUDPFlags = BitConverter.ToUInt32(buffer, 24);
}
if (size >= 32)
{
uLowIDUsers = BitConverter.ToUInt32(buffer, 28);
}
if (size >= 40)
{
// TODO debug check if this packet was encrypted if it has a key
nUDPObfuscationPort = BitConverter.ToUInt16(buffer, 32);
nTCPObfuscationPort = BitConverter.ToUInt16(buffer, 34);;
dwServerUDPKey = BitConverter.ToUInt32(buffer, 36);
}
if (pServer != null)
{
pServer.Ping = MpdUtilities.GetTickCount() - pServer.LastPinged;
pServer.UserCount = cur_user;
pServer.FileCount = cur_files;
pServer.MaxUsers = cur_maxusers;
pServer.SoftFiles = cur_softfiles;
pServer.HardFiles = cur_hardfiles;
pServer.ServerKeyUDP = dwServerUDPKey;
pServer.ObfuscationPortTCP = nTCPObfuscationPort;
pServer.ObfuscationPortUDP = nUDPObfuscationPort;
// if the received UDP flags do not match any already stored UDP flags,
// reset the server version string because the version (which was determined by last connecting to
// that server) is most likely not accurat any longer.
// this may also give 'false' results because we don't know the UDP flags when connecting to a server
// with TCP.
//if (pServer.GetUDPFlags() != uUDPFlags)
// pServer.Version(_T = "");
pServer.UDPFlags = (ED2KServerUdpFlagsEnum)uUDPFlags;
pServer.LowIDUsers = uLowIDUsers;
pServer.SetLastDescPingedCount(false);
if (pServer.LastDescPingedCount < 2)
{
// eserver 16.45+ supports a new OP_SERVER_DESC_RES answer, if the OP_SERVER_DESC_REQ contains a uint
// challenge, the server returns additional info with OP_SERVER_DESC_RES. To properly distinguish the
// old and new OP_SERVER_DESC_RES answer, the challenge has to be selected carefully. The first 2 bytes
// of the challenge (in network byte order) MUST NOT be a valid string-len-int16!
Packet packet1 =
MuleApplication.Instance.NetworkObjectManager.CreatePacket(OperationCodeEnum.OP_SERVER_DESC_REQ, 4);
uint uDescReqChallenge =
((uint)MpdUtilities.GetRandomUInt16() << 16) +
MuleConstants.INV_SERV_DESC_LEN; // 0xF0FF = an 'invalid' string length.
pServer.DescReqChallenge = uDescReqChallenge;
Array.Copy(BitConverter.GetBytes(uDescReqChallenge), packet1.Buffer, 4);
MuleApplication.Instance.Statistics.AddUpDataOverheadServer(packet1.Size);
MuleApplication.Instance.ServerConnect.SendUDPPacket(packet1, pServer, true);
}
else
{
pServer.SetLastDescPingedCount(true);
}
}
break;
}
case OperationCodeEnum.OP_SERVER_DESC_RES:
{
if (pServer == null)
{
return(true);
}
// old packet: <name_len 2><name name_len><desc_len 2 desc_en>
// new packet: <challenge 4><taglist>
//
// NOTE: To properly distinguish between the two packets which are both useing the same opcode...
// the first two bytes of <challenge> (in network byte order) have to be an invalid <name_len> at least.
SafeMemFile srvinfo = MpdObjectManager.CreateSafeMemFile(buffer, size);
if (size >= 8 && BitConverter.ToUInt16(buffer, 0) == MuleConstants.INV_SERV_DESC_LEN)
{
if (pServer.DescReqChallenge != 0 && BitConverter.ToUInt32(buffer, 0) == pServer.DescReqChallenge)
{
pServer.DescReqChallenge = 0;
srvinfo.ReadUInt32(); // skip challenge
uint uTags = srvinfo.ReadUInt32();
for (uint i = 0; i < uTags; i++)
{
Tag tag = MpdObjectManager.CreateTag(srvinfo, true /*pServer.GetUnicodeSupport()*/);
if (tag.NameID == MuleConstants.ST_SERVERNAME && tag.IsStr)
{
pServer.ServerName = tag.Str;
}
else if (tag.NameID == MuleConstants.ST_DESCRIPTION && tag.IsStr)
{
pServer.Description = tag.Str;
}
else if (tag.NameID == MuleConstants.ST_DYNIP && tag.IsStr)
{
// Verify that we really received a DN.
IPAddress address;
if (!IPAddress.TryParse(tag.Str, out address) ||
address == IPAddress.None)
{
string strOldDynIP = pServer.DynIP;
pServer.DynIP = tag.Str;
// If a dynIP-server changed its address or, if this is the
// first time we get the dynIP-address for a server which we
// already have as non-dynIP in our list, we need to remove
// an already available server with the same 'dynIP:port'.
if (string.Compare(strOldDynIP, pServer.DynIP, true) != 0)
{
MuleApplication.Instance.ServerList.RemoveDuplicatesByAddress(pServer);
}
}
}
else if (tag.NameID == MuleConstants.ST_VERSION && tag.IsStr)
{
pServer.Version = tag.Str;
}
else if (tag.NameID == MuleConstants.ST_VERSION && tag.IsInt)
{
pServer.Version =
string.Format("{0}.{1}", tag.Int >> 16, tag.Int & 0xFFFF);
}
}
}
else
{
// A server sent us a new server description packet (including a challenge) although we did not
// ask for it. This may happen, if there are multiple servers running on the same machine with
// multiple IPs. If such a server is asked for a description, the server will answer 2 times,
// but with the same IP.
}
}
else
{
string strName = srvinfo.ReadString(true /*pServer.GetUnicodeSupport()*/);
string strDesc = srvinfo.ReadString(true /*pServer.GetUnicodeSupport()*/);
pServer.Description = strDesc;
pServer.ServerName = strName;
}
break;
}
default:
return(false);
}
return(true);
}
catch (Exception error)
{
ProcessPacketError((uint)size, (uint)opcode, nIP, nUDPPort, error);
if (opcode == (byte)OperationCodeEnum.OP_GLOBSEARCHRES ||
opcode == (byte)OperationCodeEnum.OP_GLOBFOUNDSOURCES)
{
return(true);
}
}
return(false);
}
public void ConnectionEstablished(Mule.Network.ServerSocket sender)
{
if (!IsConnecting)
{
// we are already IsConnected to another server
DestroySocket(sender);
return;
}
InitLocalIP();
if (sender.ConnectionState == ConnectionStateEnum.CS_WAITFORLOGIN)
{
ED2KServer pServer =
MuleApplication.Instance.ServerList.GetServerByAddress(sender.CurrentServer.Address,
sender.CurrentServer.Port);
if (pServer != null)
{
pServer.ResetFailedCount();
}
// Send login packet
SafeMemFile data = MpdObjectManager.CreateSafeMemFile(256);
data.WriteHash16(MuleApplication.Instance.Preference.UserHash);
data.WriteUInt32(ClientID);
data.WriteUInt16(MuleApplication.Instance.Preference.Port);
uint tagcount = 4;
data.WriteUInt32(tagcount);
Tag tagName = MpdObjectManager.CreateTag(TagTypeEnum.CT_NAME,
MuleApplication.Instance.Preference.UserNick);
tagName.WriteTagToFile(data);
Tag tagVersion = MpdObjectManager.CreateTag(TagTypeEnum.CT_VERSION, VersionsEnum.EDONKEYVERSION);
tagVersion.WriteTagToFile(data);
ServerFlagsEnum dwCryptFlags = 0;
if (MuleApplication.Instance.Preference.IsClientCryptLayerSupported)
{
dwCryptFlags |= ServerFlagsEnum.SRVCAP_SUPPORTCRYPT;
}
if (MuleApplication.Instance.Preference.IsClientCryptLayerRequested)
{
dwCryptFlags |= ServerFlagsEnum.SRVCAP_REQUESTCRYPT;
}
if (MuleApplication.Instance.Preference.IsClientCryptLayerRequired)
{
dwCryptFlags |= ServerFlagsEnum.SRVCAP_REQUIRECRYPT;
}
Tag tagFlags = MpdObjectManager.CreateTag(TagTypeEnum.CT_SERVER_FLAGS,
ServerFlagsEnum.SRVCAP_ZLIB | ServerFlagsEnum.SRVCAP_NEWTAGS |
ServerFlagsEnum.SRVCAP_LARGEFILES |
ServerFlagsEnum.SRVCAP_UNICODE | dwCryptFlags);
tagFlags.WriteTagToFile(data);
// eMule Version (14-Mar-2004: requested by lugdunummaster (need for LowID clients which have no chance
// to send an Hello packet to the server during the callback test))
Tag tagMuleVersion = MpdObjectManager.CreateTag(TagTypeEnum.CT_EMULE_VERSION,
(MuleApplication.Instance.Version.Major << 17) |
(MuleApplication.Instance.Version.Minor << 10) |
(MuleApplication.Instance.Version.Build << 7));
tagMuleVersion.WriteTagToFile(data);
Packet packet = MuleApplication.Instance.NetworkObjectManager.CreatePacket(data);
packet.OperationCode = OperationCodeEnum.OP_LOGINREQUEST;
MuleApplication.Instance.Statistics.AddUpDataOverheadServer(packet.Size);
SendPacket(packet, true, sender);
}
else if (sender.ConnectionState == ConnectionStateEnum.CS_CONNECTED)
{
MuleApplication.Instance.Statistics.Reconnects++;
MuleApplication.Instance.Statistics.ServerConnectTime = MpdUtilities.GetTickCount();
IsConnected = true;
connectedSocket_ = sender;
StopConnectionTry();
MuleApplication.Instance.SharedFiles.ClearED2KPublishInfo();
MuleApplication.Instance.SharedFiles.SendListToServer();
if (MuleApplication.Instance.Preference.DoesAddServersFromServer)
{
Packet packet =
MuleApplication.Instance.NetworkObjectManager.CreatePacket(
OperationCodeEnum.OP_GETSERVERLIST, 0);
MuleApplication.Instance.Statistics.AddUpDataOverheadServer(packet.Size);
SendPacket(packet, true);
}
}
}