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SenderModule.cpp
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SenderModule.cpp
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#include "SenderModule.h"
SenderModule::SenderModule(const vector<IfaceData>& ifaces,
const vector<string>& mcastAddresses, int mcastPort,
int nLoopbackIfaces, bool useIpV6, float loopInterval) :
McastModuleInterface(ifaces, mcastAddresses, mcastPort, useIpV6),
mLoopbackCount(nLoopbackIfaces), mLoopInterval(loopInterval)
{
std::stringstream loopMsg;
if (nLoopbackIfaces>=0)
{
loopMsg << nLoopbackIfaces;
}
else
{
loopMsg << "all";
}
cout << "Sending with " << loopMsg.str() << " interface loopbacks";
if (shouldLoop())
{
cout << " with interval " << mLoopInterval << " second(s)";
}
cout << endl;
mIsStopped = false;
mSenderPort = mMcastPort+1;
}
bool SenderModule::run()
{
bool retVal = true;
if (!init())
{
LOG_ERROR("Error initing sender module");
return false;
}
// Spawn listener thread
pthread_t rxThread;
if (0 != pthread_create(&rxThread, NULL, &SenderModule::rxThreadHelper, this))
{
LOG_ERROR("Cannot spawn listener thread");
return false;
}
else
{
cout << "Listener thread started [OK]" << endl;
}
cout << "==============================================================" << endl;
if (!sendMcastMessages())
{
LOG_ERROR("There's problem sending in SenderModule");
retVal = false;
}
// Allow ack listener for 3 seconds
sleep(3);
mIsStopped = true;
return retVal;
}
void* SenderModule::runUcastReceiver()
{
// Now listen to ack msgs
char rxBuf[MCAST_BUFF_LEN];
struct sockaddr_storage rmt;
fd_set listenSet;
struct timeval timeout;
int maxFd = -1;
for (unsigned i = 0; i < mIfaces.size(); ++i)
{
maxFd = (maxFd < mIfaces[i].sockFd)? mIfaces[i].sockFd : maxFd;
}
while (!mIsStopped)
{
LOG_DEBUG("listening...");
FD_ZERO(&listenSet);
for (unsigned i = 0; i < mIfaces.size(); ++i)
{
FD_SET(mIfaces[i].sockFd, &listenSet);
}
timeout.tv_sec = 1;
timeout.tv_usec = 1;
int numReady = select(maxFd + 1, &listenSet, NULL, NULL, &timeout);
if (numReady <= 0)
{
if (numReady<0)
{
LOG_ERROR("select: " << strerror(errno));
}
continue;
}
while(numReady-- > 0)
{
int resultFd = -1;
std::string recvIfaceName = "default";
for (unsigned ii = 0 ; ii < mIfaces.size(); ++ii)
{
resultFd = mIfaces[ii].sockFd;
if (FD_ISSET(resultFd, &listenSet))
{
FD_CLR(resultFd, &listenSet);
recvIfaceName = mIfaces[ii].ifaceName;
break;
}
}
// Get respond data
memset(rxBuf, 0, sizeof(rxBuf));
socklen_t rmtLen = sizeof(rmt);
int rxBytes = recvfrom(resultFd, rxBuf, sizeof(rxBuf), 0,
(struct sockaddr*) &rmt, &rmtLen);
if (-1 == rxBytes)
{
LOG_ERROR("recvfrom: "<< strerror(errno));
sleep(1);
continue;
}
// get the sender info
char senderIp[INET6_ADDRSTRLEN];
if (rmt.ss_family == AF_INET)
{
struct sockaddr_in *sender_addr = (struct sockaddr_in*) &rmt;
inet_ntop(rmt.ss_family, &sender_addr->sin_addr, senderIp, sizeof(senderIp));
}
else if (rmt.ss_family == AF_INET6)
{
struct sockaddr_in6 *sender_addr = (struct sockaddr_in6*) &rmt;
inet_ntop(rmt.ss_family, &sender_addr->sin6_addr, senderIp, sizeof(senderIp));
}
string decodedMsg;
if (Common::decodeAckMessage(rxBuf, decodedMsg))
{
if (isIpV6())
{
printf("[ACK] %-45s -> %-10s (%s)\n", senderIp, recvIfaceName.c_str(), decodedMsg.c_str());
}
else
{
printf("[ACK] %-15s -> %-10s (%s)\n", senderIp, recvIfaceName.c_str(), decodedMsg.c_str());
}
}
else
{
printf("[STRAY] %-15s -> %-10s (%s)\n", senderIp, recvIfaceName.c_str(), rxBuf);
}
}
}
return 0;
}
bool SenderModule::shouldLoop() const
{
return mLoopInterval > 0.0;
}
bool SenderModule::sendMcastMessages(int port)
{
// build addr struct vector
// if port is -1, use mcast port
port = (-1 == port)? mMcastPort: port;
vector<struct sockaddr_in> addrVec;
vector<struct sockaddr_in6> addr6Vec;
for (unsigned i = 0; i < mMcastAddresses.size(); ++i)
{
struct sockaddr_in addr;
struct sockaddr_in6 addr6;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr6.sin6_family = AF_INET6;
addr6.sin6_port = htons(port);
// setup mcast IP address
if (isIpV6())
{
if (inet_pton(AF_INET6, mMcastAddresses[i].c_str(), &addr6.sin6_addr) != 1)
{
LOG_ERROR("Error parsing address for " << mMcastAddresses[i]);
return false;
}
addr6Vec.push_back(addr6);
}
else
{
addr.sin_addr.s_addr = inet_addr(mMcastAddresses[i].c_str());
addrVec.push_back(addr);
}
}
// build message
const string dmsg = "<Sender info:";
int msgSeqNumber = 1;
do
{
char msgBuf[MCAST_BUFF_LEN];
for (unsigned i = 0; i < mIfaces.size(); ++i)
{
const IfaceData ifaceData = mIfaces[i];
int fd = ifaceData.sockFd;
// build message
memset(msgBuf, 0 ,sizeof(msgBuf));
if (shouldLoop())
{
sprintf(msgBuf, "%4d ", msgSeqNumber);
}
sprintf(msgBuf, "%s%s %s>", msgBuf, dmsg.c_str(), ifaceData.toString().c_str());
// send message
for (unsigned i = 0; i < addrVec.size() + addr6Vec.size(); ++i)
{
const struct sockaddr_in& addr = addrVec[i];
const struct sockaddr_in6& addr6 = addr6Vec[i];
int byteSent;
if (!isIpV6())
{
byteSent = sendto(fd, msgBuf, strlen(msgBuf) + 1,
MSG_NOSIGNAL|MSG_DONTWAIT, (struct sockaddr *) &addr, sizeof(addr));
}
else
{
byteSent = sendto(fd, msgBuf, strlen(msgBuf) + 1,
MSG_NOSIGNAL|MSG_DONTWAIT, (struct sockaddr *) &addr6, sizeof(addr6));
}
// Error check for sending message
if (0 > byteSent)
{
LOG_ERROR("sendto " << ifaceData << " :" << strerror(errno));
return false;
}
else
{
LOG_DEBUG("[SENT] " << ifaceData << " bytes: " << byteSent);
}
}
}
// loop interval
if (shouldLoop())
{
++msgSeqNumber;
(void) usleep( (int)(mLoopInterval*1e6) );
}
} while (shouldLoop());
return true;
}
void* SenderModule::rxThreadHelper(void* context)
{
return ((SenderModule*)context)->runUcastReceiver();
}
bool SenderModule::init()
{
/*
* First, setup mcast for all interfaces
*/
for (unsigned i = 0; i < mIfaces.size(); ++i)
{
bool setMcastOk;
if (isIpV6())
{
setMcastOk = associateMcastV6WithIfaceName(mIfaces[i].sockFd,
mIfaces[i].ifaceName.c_str(), mLoopbackCount<0 || (int)i < mLoopbackCount);
}
else
{
setMcastOk = associateMcastWithIfaceName(mIfaces[i].sockFd,
mIfaces[i].ifaceName.c_str(), mLoopbackCount<0 || (int)i < mLoopbackCount);
}
if (!setMcastOk)
{
LOG_ERROR("Setting mcast for " << mIfaces[i]);
return false;
}
}
return true;
}