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/*
Copyright (C) 2010 Srivats P.
This file is part of "Ostinato"
This 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 3 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, see <http://www.gnu.org/licenses/>
*/
#include "tcp.h"
TcpProtocol::TcpProtocol(StreamBase *stream, AbstractProtocol *parent)
: AbstractProtocol(stream, parent)
{
}
TcpProtocol::~TcpProtocol()
{
}
AbstractProtocol* TcpProtocol::createInstance(StreamBase *stream,
AbstractProtocol *parent)
{
return new TcpProtocol(stream, parent);
}
quint32 TcpProtocol::protocolNumber() const
{
return OstProto::Protocol::kTcpFieldNumber;
}
void TcpProtocol::protoDataCopyInto(OstProto::Protocol &protocol) const
{
protocol.MutableExtension(OstProto::tcp)->CopyFrom(data);
protocol.mutable_protocol_id()->set_id(protocolNumber());
}
void TcpProtocol::protoDataCopyFrom(const OstProto::Protocol &protocol)
{
if (protocol.protocol_id().id() == protocolNumber() &&
protocol.HasExtension(OstProto::tcp))
data.MergeFrom(protocol.GetExtension(OstProto::tcp));
}
QString TcpProtocol::name() const
{
return QString("Transmission Control Protocol (state less)");
}
QString TcpProtocol::shortName() const
{
return QString("TCP");
}
AbstractProtocol::ProtocolIdType TcpProtocol::protocolIdType() const
{
return ProtocolIdTcpUdp;
}
quint32 TcpProtocol::protocolId(ProtocolIdType type) const
{
switch(type)
{
case ProtocolIdIp: return 0x06;
default: break;
}
return AbstractProtocol::protocolId(type);
}
int TcpProtocol::fieldCount() const
{
return tcp_fieldCount;
}
AbstractProtocol::FieldFlags TcpProtocol::fieldFlags(int index) const
{
AbstractProtocol::FieldFlags flags;
flags = AbstractProtocol::fieldFlags(index);
switch (index)
{
case tcp_src_port:
case tcp_dst_port:
case tcp_seq_num:
case tcp_ack_num:
case tcp_hdrlen:
case tcp_rsvd:
case tcp_flags:
case tcp_window:
break;
case tcp_cksum:
flags |= CksumField;
break;
case tcp_urg_ptr:
break;
case tcp_is_override_src_port:
case tcp_is_override_dst_port:
case tcp_is_override_hdrlen:
case tcp_is_override_cksum:
flags &= ~FrameField;
flags |= MetaField;
break;
default:
qFatal("%s: unimplemented case %d in switch", __PRETTY_FUNCTION__,
index);
break;
}
return flags;
}
QVariant TcpProtocol::fieldData(int index, FieldAttrib attrib,
int streamIndex) const
{
switch (index)
{
case tcp_src_port:
{
quint16 srcPort;
switch(attrib)
{
case FieldValue:
case FieldFrameValue:
case FieldTextValue:
if (data.is_override_src_port())
srcPort = data.src_port();
else
srcPort = payloadProtocolId(ProtocolIdTcpUdp);
break;
default:
srcPort = 0; // avoid the 'maybe used unitialized' warning
break;
}
switch(attrib)
{
case FieldName:
return QString("Source Port");
case FieldValue:
return srcPort;
case FieldTextValue:
return QString("%1").arg(srcPort);
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian(srcPort, (uchar*) fv.data());
return fv;
}
default:
break;
}
break;
}
case tcp_dst_port:
{
quint16 dstPort;
switch(attrib)
{
case FieldValue:
case FieldFrameValue:
case FieldTextValue:
if (data.is_override_dst_port())
dstPort = data.dst_port();
else
dstPort = payloadProtocolId(ProtocolIdTcpUdp);
break;
default:
dstPort = 0; // avoid the 'maybe used unitialized' warning
break;
}
switch(attrib)
{
case FieldName:
return QString("Destination Port");
case FieldValue:
return dstPort;
case FieldTextValue:
return QString("%1").arg(dstPort);
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian(dstPort, (uchar*) fv.data());
return fv;
}
default:
break;
}
break;
}
case tcp_seq_num:
switch(attrib)
{
case FieldName:
return QString("Sequence Number");
case FieldValue:
return data.seq_num();
case FieldTextValue:
return QString("%1").arg(data.seq_num());
case FieldFrameValue:
{
QByteArray fv;
fv.resize(4);
qToBigEndian((quint32) data.seq_num(), (uchar*) fv.data());
return fv;
}
default:
break;
}
break;
case tcp_ack_num:
switch(attrib)
{
case FieldName:
return QString("Acknowledgement Number");
case FieldValue:
return data.ack_num();
case FieldTextValue:
return QString("%1").arg(data.ack_num());
case FieldFrameValue:
{
QByteArray fv;
fv.resize(4);
qToBigEndian((quint32) data.ack_num(), (uchar*) fv.data());
return fv;
}
default:
break;
}
break;
case tcp_hdrlen:
switch(attrib)
{
case FieldName:
return QString("Header Length");
case FieldValue:
if (data.is_override_hdrlen())
return ((data.hdrlen_rsvd() >> 4) & 0x0F);
else
return 5;
case FieldTextValue:
if (data.is_override_hdrlen())
return QString("%1 bytes").arg(
4 * ((data.hdrlen_rsvd() >> 4) & 0x0F));
else
return QString("20 bytes");
case FieldFrameValue:
if (data.is_override_hdrlen())
return QByteArray(1,
(char)((data.hdrlen_rsvd() >> 4) & 0x0F));
else
return QByteArray(1, (char) 0x05);
case FieldBitSize:
return 4;
default:
break;
}
break;
case tcp_rsvd:
switch(attrib)
{
case FieldName:
return QString("Reserved");
case FieldValue:
return (data.hdrlen_rsvd() & 0x0F);
case FieldTextValue:
return QString("%1").arg(data.hdrlen_rsvd() & 0x0F);
case FieldFrameValue:
return QByteArray(1, (char)(data.hdrlen_rsvd() & 0x0F));
case FieldBitSize:
return 4;
default:
break;
}
break;
case tcp_flags:
switch(attrib)
{
case FieldName:
return QString("Flags");
case FieldValue:
return (data.flags());
case FieldTextValue:
{
QString s;
s.append("URG: ");
s.append(data.flags() & TCP_FLAG_URG ? "1" : "0");
s.append(" ACK: ");
s.append(data.flags() & TCP_FLAG_ACK ? "1" : "0");
s.append(" PSH: ");
s.append(data.flags() & TCP_FLAG_PSH ? "1" : "0");
s.append(" RST: ");
s.append(data.flags() & TCP_FLAG_RST ? "1" : "0");
s.append(" SYN: ");
s.append(data.flags() & TCP_FLAG_SYN ? "1" : "0");
s.append(" FIN: ");
s.append(data.flags() & TCP_FLAG_FIN ? "1" : "0");
return s;
}
case FieldFrameValue:
return QByteArray(1, (char)(data.flags() & 0x3F));
default:
break;
}
break;
case tcp_window:
switch(attrib)
{
case FieldName:
return QString("Window Size");
case FieldValue:
return data.window();
case FieldTextValue:
return QString("%1").arg(data.window());
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian((quint16) data.window(), (uchar*) fv.data());
return fv;
}
default:
break;
}
break;
case tcp_cksum:
switch(attrib)
{
case FieldName:
return QString("Checksum");
case FieldValue:
{
quint16 cksum;
if (data.is_override_cksum())
cksum = data.cksum();
else
cksum = protocolFrameCksum(streamIndex, CksumTcpUdp);
return cksum;
}
case FieldTextValue:
{
quint16 cksum;
if (data.is_override_cksum())
cksum = data.cksum();
else
cksum = protocolFrameCksum(streamIndex, CksumTcpUdp);
return QString("0x%1").arg(cksum, 4, BASE_HEX, QChar('0'));
}
case FieldFrameValue:
{
quint16 cksum;
if (data.is_override_cksum())
cksum = data.cksum();
else
cksum = protocolFrameCksum(streamIndex, CksumTcpUdp);
QByteArray fv;
fv.resize(2);
qToBigEndian(cksum, (uchar*) fv.data());
return fv;
}
case FieldBitSize:
return 16;
default:
break;
}
break;
case tcp_urg_ptr:
switch(attrib)
{
case FieldName:
return QString("Urgent Pointer");
case FieldValue:
return data.urg_ptr();
case FieldTextValue:
return QString("%1").arg(data.urg_ptr());
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian((quint16) data.urg_ptr(), (uchar*) fv.data());
return fv;
}
default:
break;
}
break;
// Meta fields
case tcp_is_override_src_port:
{
switch(attrib)
{
case FieldValue:
return data.is_override_src_port();
default:
break;
}
break;
}
case tcp_is_override_dst_port:
{
switch(attrib)
{
case FieldValue:
return data.is_override_dst_port();
default:
break;
}
break;
}
case tcp_is_override_hdrlen:
{
switch(attrib)
{
case FieldValue:
return data.is_override_hdrlen();
default:
break;
}
break;
}
case tcp_is_override_cksum:
{
switch(attrib)
{
case FieldValue:
return data.is_override_cksum();
default:
break;
}
break;
}
default:
qFatal("%s: unimplemented case %d in switch", __PRETTY_FUNCTION__,
index);
break;
}
return AbstractProtocol::fieldData(index, attrib, streamIndex);
}
bool TcpProtocol::setFieldData(int index, const QVariant &value,
FieldAttrib attrib)
{
bool isOk = false;
if (attrib != FieldValue)
goto _exit;
switch (index)
{
case tcp_src_port:
{
uint srcPort = value.toUInt(&isOk);
if (isOk)
data.set_src_port(srcPort);
break;
}
case tcp_dst_port:
{
uint dstPort = value.toUInt(&isOk);
if (isOk)
data.set_dst_port(dstPort);
break;
}
case tcp_seq_num:
{
uint seqNum = value.toUInt(&isOk);
if (isOk)
data.set_seq_num(seqNum);
break;
}
case tcp_ack_num:
{
uint ackNum = value.toUInt(&isOk);
if (isOk)
data.set_ack_num(ackNum);
break;
}
case tcp_hdrlen:
{
uint hdrLen = value.toUInt(&isOk);
if (isOk)
data.set_hdrlen_rsvd(
(data.hdrlen_rsvd() & 0x0F) | (hdrLen << 4));
break;
}
case tcp_rsvd:
{
uint rsvd = value.toUInt(&isOk);
if (isOk)
data.set_hdrlen_rsvd(
(data.hdrlen_rsvd() & 0xF0) | (rsvd & 0x0F));
break;
}
case tcp_flags:
{
uint flags = value.toUInt(&isOk);
if (isOk)
data.set_flags(flags);
break;
}
case tcp_window:
{
uint window = value.toUInt(&isOk);
if (isOk)
data.set_window(window);
break;
}
case tcp_cksum:
{
uint cksum = value.toUInt(&isOk);
if (isOk)
data.set_cksum(cksum);
break;
}
case tcp_urg_ptr:
{
uint urgPtr = value.toUInt(&isOk);
if (isOk)
data.set_urg_ptr(urgPtr);
break;
}
case tcp_is_override_src_port:
{
data.set_is_override_src_port(value.toBool());
isOk = true;
break;
}
case tcp_is_override_dst_port:
{
data.set_is_override_dst_port(value.toBool());
isOk = true;
break;
}
case tcp_is_override_hdrlen:
{
data.set_is_override_hdrlen(value.toBool());
isOk = true;
break;
}
case tcp_is_override_cksum:
{
data.set_is_override_cksum(value.toBool());
isOk = true;
break;
}
default:
qFatal("%s: unimplemented case %d in switch", __PRETTY_FUNCTION__,
index);
break;
}
_exit:
return isOk;
}
int TcpProtocol::protocolFrameVariableCount() const
{
int count = AbstractProtocol::protocolFrameVariableCount();
if (!data.is_override_cksum())
count = AbstractProtocol::lcm(count,
protocolFramePayloadVariableCount());
return count;
}
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