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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 "udp.h"
UdpProtocol::UdpProtocol(StreamBase *stream, AbstractProtocol *parent)
: AbstractProtocol(stream, parent)
{
}
UdpProtocol::~UdpProtocol()
{
}
AbstractProtocol* UdpProtocol::createInstance(StreamBase *stream,
AbstractProtocol *parent)
{
return new UdpProtocol(stream, parent);
}
quint32 UdpProtocol::protocolNumber() const
{
return OstProto::Protocol::kUdpFieldNumber;
}
void UdpProtocol::protoDataCopyInto(OstProto::Protocol &protocol) const
{
protocol.MutableExtension(OstProto::udp)->CopyFrom(data);
protocol.mutable_protocol_id()->set_id(protocolNumber());
}
void UdpProtocol::protoDataCopyFrom(const OstProto::Protocol &protocol)
{
if (protocol.protocol_id().id() == protocolNumber() &&
protocol.HasExtension(OstProto::udp))
data.MergeFrom(protocol.GetExtension(OstProto::udp));
}
QString UdpProtocol::name() const
{
return QString("User Datagram Protocol");
}
QString UdpProtocol::shortName() const
{
return QString("UDP");
}
AbstractProtocol::ProtocolIdType UdpProtocol::protocolIdType() const
{
return ProtocolIdTcpUdp;
}
quint32 UdpProtocol::protocolId(ProtocolIdType type) const
{
switch(type)
{
case ProtocolIdIp: return 0x11;
default: break;
}
return AbstractProtocol::protocolId(type);
}
int UdpProtocol::fieldCount() const
{
return udp_fieldCount;
}
AbstractProtocol::FieldFlags UdpProtocol::fieldFlags(int index) const
{
AbstractProtocol::FieldFlags flags;
flags = AbstractProtocol::fieldFlags(index);
switch (index)
{
case udp_srcPort:
case udp_dstPort:
case udp_totLen:
break;
case udp_cksum:
flags |= CksumField;
break;
case udp_isOverrideSrcPort:
case udp_isOverrideDstPort:
case udp_isOverrideTotLen:
case udp_isOverrideCksum:
flags &= ~FrameField;
flags |= MetaField;
break;
default:
qFatal("%s: unimplemented case %d in switch", __PRETTY_FUNCTION__,
index);
break;
}
return flags;
}
QVariant UdpProtocol::fieldData(int index, FieldAttrib attrib,
int streamIndex) const
{
switch (index)
{
case udp_srcPort:
{
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 udp_dstPort:
{
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 udp_totLen:
{
switch(attrib)
{
case FieldName:
return QString("Datagram Length");
case FieldValue:
{
int totlen;
totlen = data.is_override_totlen() ?
data.totlen() :
(protocolFramePayloadSize(streamIndex) + 8);
return totlen;
}
case FieldFrameValue:
{
QByteArray fv;
int totlen;
totlen = data.is_override_totlen() ?
data.totlen() :
(protocolFramePayloadSize(streamIndex) + 8);
fv.resize(2);
qToBigEndian((quint16) totlen, (uchar*) fv.data());
return fv;
}
case FieldTextValue:
{
int totlen;
totlen = data.is_override_totlen() ?
data.totlen() :
(protocolFramePayloadSize(streamIndex) + 8);
return QString("%1").arg(totlen);
}
case FieldBitSize:
return 16;
default:
break;
}
break;
}
case udp_cksum:
{
quint16 cksum;
switch(attrib)
{
case FieldValue:
case FieldFrameValue:
case FieldTextValue:
{
if (data.is_override_cksum())
cksum = data.cksum();
else
{
cksum = protocolFrameCksum(streamIndex, CksumTcpUdp);
if (cksum == 0)
cksum = 0xFFFF;
}
qDebug("UDP cksum = %hu", cksum);
break;
}
default:
cksum = 0;
break;
}
switch(attrib)
{
case FieldName:
return QString("Checksum");
case FieldValue:
return cksum;
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian(cksum, (uchar*) fv.data());
return fv;
}
case FieldTextValue:
return QString("0x%1").
arg(cksum, 4, BASE_HEX, QChar('0'));;
case FieldBitSize:
return 16;
default:
break;
}
break;
}
// Meta fields
case udp_isOverrideSrcPort:
{
switch(attrib)
{
case FieldValue:
return data.is_override_src_port();
default:
break;
}
break;
}
case udp_isOverrideDstPort:
{
switch(attrib)
{
case FieldValue:
return data.is_override_dst_port();
default:
break;
}
break;
}
case udp_isOverrideTotLen:
{
switch(attrib)
{
case FieldValue:
return data.is_override_totlen();
default:
break;
}
break;
}
case udp_isOverrideCksum:
{
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 UdpProtocol::setFieldData(int index, const QVariant& value,
FieldAttrib attrib)
{
bool isOk = false;
if (attrib != FieldValue)
goto _exit;
switch (index)
{
case udp_isOverrideSrcPort:
{
data.set_is_override_src_port(value.toBool());
isOk = true;
break;
}
case udp_isOverrideDstPort:
{
data.set_is_override_dst_port(value.toBool());
isOk = true;
break;
}
case udp_isOverrideTotLen:
{
data.set_is_override_totlen(value.toBool());
isOk = true;
break;
}
case udp_isOverrideCksum:
{
data.set_is_override_cksum(value.toBool());
isOk = true;
break;
}
case udp_srcPort:
{
uint srcPort = value.toUInt(&isOk);
if (isOk)
data.set_src_port(srcPort);
break;
}
case udp_dstPort:
{
uint dstPort = value.toUInt(&isOk);
if (isOk)
data.set_dst_port(dstPort);
break;
}
case udp_totLen:
{
uint totLen = value.toUInt(&isOk);
if (isOk)
data.set_totlen(totLen);
break;
}
case udp_cksum:
{
uint cksum = value.toUInt(&isOk);
if (isOk)
data.set_cksum(cksum);
break;
}
default:
qFatal("%s: unimplemented case %d in switch", __PRETTY_FUNCTION__,
index);
break;
}
_exit:
return isOk;
}
int UdpProtocol::protocolFrameVariableCount() const
{
int count;
if (data.is_override_totlen() && data.is_override_cksum())
count = AbstractProtocol::protocolFrameVariableCount();
else
count = AbstractProtocol::lcm(
AbstractProtocol::protocolFrameVariableCount(),
protocolFramePayloadVariableCount());
return count;
}
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