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/*
Copyright (C) 2023 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 "pcaptxttagstats.h"
#include "pcapextra.h"
#include "../common/debugdefs.h"
#include "../common/sign.h"
#include "streamtiming.h"
#define Xnotify qWarning // FIXME
PcapTxTtagStats::PcapTxTtagStats(const char *device, int id)
: portId_(id)
{
setObjectName(QString("TxT$:%1").arg(device));
device_ = QString::fromLatin1(device);
timing_ = StreamTiming::instance();
}
void PcapTxTtagStats::run()
{
int flags = PCAP_OPENFLAG_PROMISCUOUS;
char errbuf[PCAP_ERRBUF_SIZE] = "";
struct bpf_program bpf;
const int optimize = 1;
QString capture_filter = QString(
"(ether[len - 4:4] == 0x%1) and (ether[len - 5:1] == 0x%2)")
.arg(SignProtocol::magic(), 0, BASE_HEX)
.arg(SignProtocol::kTypeLenTtag, 0, BASE_HEX);
qDebug("In %s", __PRETTY_FUNCTION__);
qDebug("pcap-filter: %s", qPrintable(capture_filter));
handle_ = pcap_open_live(qPrintable(device_), 65535,
flags, 100 /* ms */, errbuf);
if (!handle_) {
if (flags && QString(errbuf).contains("promiscuous")) {
Xnotify("Unable to set promiscuous mode on <%s> - "
"stream stats time tracking will not work", qPrintable(device_));
goto _exit;
}
else {
Xnotify("Unable to open <%s> [%s] - stream stats rx will not work",
qPrintable(device_), errbuf);
goto _exit;
}
}
#ifdef Q_OS_WIN32
// pcap_setdirection() API is not supported in Windows.
// NOTE: WinPcap 4.1.1 and above exports a dummy API that returns -1
// but since we would like to work with previous versions of WinPcap
// also, we assume the API does not exist
isDirectional_ = false;
#else
if (pcap_setdirection(handle_, PCAP_D_OUT) < 0) {
qDebug("TxTtagStats: Error setting OUT direction %s: %s\n",
qPrintable(device_), pcap_geterr(handle_));
isDirectional_ = false;
}
#endif
if (pcap_compile(handle_, &bpf, qPrintable(capture_filter),
optimize, 0) < 0) {
qWarning("%s: error compiling filter: %s", qPrintable(device_),
pcap_geterr(handle_));
goto _skip_filter;
}
if (pcap_setfilter(handle_, &bpf) < 0) {
qWarning("%s: error setting filter: %s", qPrintable(device_),
pcap_geterr(handle_));
goto _skip_filter;
}
_skip_filter:
clearDebugStats();
PcapSession::preRun();
state_ = kRunning;
while (1) {
int ret;
struct pcap_pkthdr *hdr;
const uchar *data;
ret = pcap_next_ex(handle_, &hdr, &data);
switch (ret) {
case 1: {
uint ttagId;
uint guid;
if (SignProtocol::packetTtagId(data, hdr->caplen,
&ttagId, &guid)) {
#ifdef Q_OS_WIN32
// TxPort is NOT us ==> Rx Packet, so skip
// See similar check in PcapRxStats for details
if (ttagId >> 8 != uint(portId_))
break;
ttagId &= 0xFF;
#endif
timing_->recordTxTime(portId_, guid, ttagId, hdr->ts);
}
break;
}
case 0:
// timeout: just go back to the loop
break;
case -1:
qWarning("%s: error reading packet (%d): %s",
__PRETTY_FUNCTION__, ret, pcap_geterr(handle_));
break;
case -2:
qDebug("%s: Loop/signal break or some other error",
__PRETTY_FUNCTION__);
break;
default:
qWarning("%s: Unexpected return value %d",
__PRETTY_FUNCTION__, ret);
stop_ = true;
}
if (stop_) {
qDebug("user requested txTtagStats stop");
break;
}
}
PcapSession::postRun();
pcap_close(handle_);
handle_ = NULL;
stop_ = false;
_exit:
state_ = kFinished;
}
bool PcapTxTtagStats::start()
{
if (state_ == kRunning) {
qWarning("TxTtagStats start requested but is already running!");
goto _exit;
}
state_ = kNotStarted;
PcapSession::start();
while (state_ == kNotStarted)
QThread::msleep(10);
_exit:
return true;
}
bool PcapTxTtagStats::stop()
{
if (state_ == kRunning) {
stop_ = true;
PcapSession::stop();
while (state_ == kRunning)
QThread::msleep(10);
}
else
qWarning("TxTtagStats stop requested but is not running!");
return true;
}
bool PcapTxTtagStats::isRunning()
{
return (state_ == kRunning);
}
bool PcapTxTtagStats::isDirectional()
{
return isDirectional_;
}
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