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ReceiverModule.cpp
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ReceiverModule.cpp
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#include "ReceiverModule.h"
ReceiverModule::ReceiverModule(const vector<IfaceData>& ifaces,
const vector<string>& mcastAddresses, int mcastPort, bool useIpV6) :
McastModuleInterface(ifaces, mcastAddresses, mcastPort, useIpV6)
{
mUnicastSenderSock = -1;
}
ReceiverModule::~ReceiverModule()
{
::close(mUnicastSenderSock);
}
bool ReceiverModule::run()
{
int maxSockD = -1;
cout << "Listening ..."<< endl;
for (unsigned i = 0; i < mIfaces.size(); ++i)
{
int fd = mIfaces[i].sockFd;
int setOk;
if (isIpV6())
{
setOk = joinMcastIfaceV6(fd, mIfaces[i].ifaceName.c_str());
}
else
{
setOk = joinMcastIface(fd, mIfaces[i].ifaceName.c_str());
}
if (setOk != 0)
{
LOG_ERROR("Error " << setOk << " setting mcast for " << mIfaces[i]);
continue;
}
else
{
cout << "Interface " << mIfaces[i] << " [OK]" << endl;
}
maxSockD = (maxSockD < fd) ? fd : maxSockD;
}
// Finally initialize unicast sender
if (-1 == (mUnicastSenderSock = Common::createSocket(isIpV6())))
{
LOG_ERROR("Cannot create socket");
return false;
}
if (-1 == Common::setReuseSocket(mUnicastSenderSock))
{
LOG_ERROR("Cannot set reuse socket");
return false;
}
// Bind ucast sock port to mcast port
int ret = -1;
if (isIpV6())
{
struct sockaddr_in6 ucastSrcAddr;
memset(&ucastSrcAddr, 0, sizeof(ucastSrcAddr));
ucastSrcAddr.sin6_family = AF_INET6;
ucastSrcAddr.sin6_port = htons(0);
ret = ::bind(mUnicastSenderSock, (struct sockaddr *) &ucastSrcAddr, sizeof(ucastSrcAddr));
}
else
{
struct sockaddr_in ucastSrcAddr;
memset(&ucastSrcAddr, 0, sizeof(ucastSrcAddr));
ucastSrcAddr.sin_family = AF_INET;
ucastSrcAddr.sin_addr.s_addr = htonl(INADDR_ANY);
ucastSrcAddr.sin_port = htons(mMcastPort);
ret = ::bind(mUnicastSenderSock, (struct sockaddr*) &ucastSrcAddr, sizeof(ucastSrcAddr));
}
if (ret < 0)
{
LOG_ERROR("Cannot bind ack source port " << strerror(errno));
return false;
}
cout << "==============================================================" << endl;
/**
* Setup fdset
*/
struct timeval timeout;
fd_set rfds;
char buffer[MCAST_BUFF_LEN];
while (1)
{
FD_ZERO(&rfds);
for (unsigned i = 0; i < mIfaces.size(); ++i)
{
FD_SET(mIfaces[i].sockFd, &rfds);
}
timeout.tv_sec = 1;
timeout.tv_usec = 1;
int numReady = select(maxSockD + 1, &rfds, NULL, NULL, &timeout);
if (numReady <= 0)
{
continue;
}
// for each found sock fd that detected from select()
for (int i = 0; i < numReady; ++i)
{
// Retrieve the fd that has data
int fd = -1;
std::string recvIface = "default";
for (unsigned ii = 0; ii < mIfaces.size(); ++ii)
{
fd = mIfaces[ii].sockFd;
if (FD_ISSET(fd, &rfds))
{
FD_CLR(fd, &rfds);
recvIface = mIfaces[ii].ifaceName;
break;
}
}
// get sender data
struct sockaddr_storage sender;
socklen_t sendsize = sizeof(sender);
bzero(&sender, sizeof(sender));
memset(buffer, 0, sizeof(buffer));
int recvLen = recvfrom(fd, buffer, sizeof(buffer), 0, (struct sockaddr*) &sender, &sendsize);
if (0 > recvLen)
{
LOG_ERROR("recvfrom " << fd << ": " << strerror(errno));
continue;
}
// get the sender info
char senderIp[INET6_ADDRSTRLEN];
if (sender.ss_family == AF_INET)
{
struct sockaddr_in *sender_addr = (struct sockaddr_in*) &sender;
inet_ntop(sender.ss_family, &sender_addr->sin_addr, senderIp, sizeof(senderIp));
}
else if (sender.ss_family == AF_INET6)
{
struct sockaddr_in6 *sender_addr = (struct sockaddr_in6*) &sender;
inet_ntop(sender.ss_family, &sender_addr->sin6_addr, senderIp, sizeof(senderIp));
}
// print result message
string decodedMsg;
if (Common::decodeAckMessage(buffer, decodedMsg))
{
if (isIpV6())
{
printf("[ACK] %-40s (%s)\n", senderIp, decodedMsg.c_str());
}
else
{
printf("[ACK] %-15s (%s)\n", senderIp, decodedMsg.c_str());
}
}
else
{
if (isIpV6())
{
printf("%-40s -> %-15s - %s\n", senderIp, recvIface.c_str(), decodedMsg.c_str());
}
else
{
printf("%-15s -> %-15s - %s\n", senderIp, recvIface.c_str(), decodedMsg.c_str());
}
}
// Build response message
string responseMsg;
Common::encodeAckMessage(buffer, responseMsg);
if (!Common::unicastMessage(mUnicastSenderSock, sender, responseMsg))
{
LOG_ERROR("sending ack message to " << senderIp);
}
// rm fd so that it's not processed again
FD_CLR(fd, &rfds);
break;
}
}
return true;
}