void
run(void)
{
Frame* frame = NULL;
IOMultiplexing iom;
m_socket.addToPoll(iom);
while (!isStopping())
{
if (!iom.poll(1.0))
continue;
int rv = m_socket.read((char*)m_buffer, m_buffer_capacity);
if (rv == c_header_size)
{
m_count = 0;
frame = dequeueClean();
if (frame == NULL)
{
DUNE_ERR("GVSP", "buffer overrun");
break;
}
frame->setTimeStamp();
}
else if (rv == c_footer_size)
{
enqueueDirty(frame);
frame = NULL;
}
else
{
if (frame != NULL)
{
uint16_t packet_number = 0;
ByteCopy::fromBE(packet_number, m_buffer + 6);
m_count += frame->writePacket(packet_number, m_buffer + 8, rv - 8);
}
else
{
DUNE_ERR("GVSP", "null frame");
}
}
}
}
/** Submit an SMS for delivery to an IMSI. */
int sendsimple(int argc, char** argv, ostream& os)
{
if (argc<4) return BAD_NUM_ARGS;
char *IMSI = argv[1];
char *srcAddr = argv[2];
string rest = "";
for (int i=3; i<argc; i++) rest = rest + argv[i] + " ";
const char *txtBuf = rest.c_str();
if (!isIMSI(IMSI)) {
os << "Invalid IMSI. Enter 15 digits only.";
return BAD_VALUE;
}
static UDPSocket sock(0,"127.0.0.1",gConfig.getNum("SIP.Local.Port"));
static const char form[] =
"MESSAGE sip:IMSI%[email protected] SIP/2.0\n"
"Via: SIP/2.0/TCP 127.0.0.1;branch=%x\n"
"Max-Forwards: 2\n"
"From: %s <sip:%[email protected]:%d>;tag=%d\n"
"To: sip:IMSI%[email protected]\n"
"Call-ID: %[email protected]:%d\n"
"CSeq: 1 MESSAGE\n"
"Content-Type: text/plain\nContent-Length: %u\n"
"\n%s\n";
static char buffer[1500];
snprintf(buffer,1499,form,
IMSI, (unsigned)random(), srcAddr,srcAddr,sock.port(),(unsigned)random(), IMSI, (unsigned)random(),sock.port(), strlen(txtBuf), txtBuf);
sock.write(buffer);
os << "message submitted for delivery" << endl;
#if 0
int numRead = sock.read(buffer,10000);
if (numRead>=0) {
buffer[numRead]='\0';
os << "response: " << buffer << endl;
} else {
os << "timed out waiting for response";
}
#endif
return SUCCESS;
}
void
run(void)
{
Frame* frame = NULL;
while (!isStopping())
{
if (!Poll::poll(m_socket, 1.0))
continue;
size_t rv = m_socket.read(m_buffer, m_buffer_capacity);
if (rv == c_header_size)
{
m_count = 0;
frame = dequeueClean();
if (frame == NULL)
{
m_task->err(DTR("buffer overrun"));
break;
}
frame->setTimeStamp();
}
else if (rv == c_footer_size)
{
enqueueDirty(frame);
frame = NULL;
}
else
{
if (frame != NULL)
{
uint16_t packet_number = 0;
ByteCopy::fromBE(packet_number, m_buffer + 6);
m_count += frame->writePacket(packet_number, m_buffer + 8, rv - 8);
}
else
{
m_task->err(DTR("null frame"));
}
}
}
}
TEST(Network, UDPSocket)
{
UDPWriteDesc writeDesc;
writeDesc.port = 5005;
writeDesc.address = "localhost";
UDPSocket writeSocket;
ASSERT_TRUE(writeSocket.connect(writeDesc));
std::string str = "Hello World";
UDPReadDesc readDesc;
readDesc.port = 5005;
char buffer[1024];
UDPSocket socket;
ASSERT_TRUE(socket.connect(readDesc));
ASSERT_EQ(writeSocket.write(str.c_str(), str.length()), str.length());
ASSERT_EQ(socket.read(buffer, 1024), str.length());
ASSERT_STREQ(str.c_str(), buffer);
AM_LOG_SUCCESS("%s", buffer);
}
int main() {
//create tcp socket and establish a connection
TCPServerSocket tcpServerSocket;
int ret = tcpServerSocket.initialize();
ASSERT(ret == 0);
int serverUdpPort = tcpServerSocket.negotiate();
ASSERT(serverUdpPort > 1024);
tcpServerSocket.close();
//open a udp socket and listen for str
UDPSocket udpSocket;
ret = udpSocket.open(serverUdpPort);
ASSERT(ret == 0);
LOG("Server opened UDP Port %i\n", serverUdpPort);
char buf[1024];
unsigned long remoteIp;
int remotePort;
//read, reverse string and send it back to client
int readBytes = udpSocket.read(buf, 1024, remoteIp, remotePort);
buf[readBytes] = '\0';
ASSERT(readBytes > 0);
LOG("Server Received: %s\n", buf);
//Reverse the string and write to the buffer again
str_reverse(buf);
int writeBytes = udpSocket.write(remoteIp, remotePort, (const char *) buf, readBytes);
ASSERT(writeBytes > 0);
LOG("Server sent: %s\n", buf);
udpSocket.close();
return 0;
}
int main(int argc, char* argv[]) {
//parse args
if (argc != 5) {
std::cout << "This program requires 4 arguments in the following format!" << std::endl;
std::cout << "sender <host address of emulator> <udp port number of emulator in FWD direction>" << "\n"
<< "<udp port number of sender to receive acks> <fileName>" << std::endl;
std::cout << "Example: sender 192.168.89.78 49998 11234 test.txt" << std::endl;
return 1;
}
const char* ipAddr = argv[1];
if (0 == strcmp(ipAddr, "localhost")) {
ipAddr = "127.0.0.1";
}
unsigned long remoteIp = inet_addr(ipAddr);
int remotePort = atoi(argv[2]);
int senderPort = atoi(argv[3]);
const char* fileName = argv[4];
int totalPackets = 0;
int totalBytes = 0;
int sentPackets = 0;
int sentBytes = 0;
int seqNum = 0;
signal(SIGALRM, signal_alarm_handler);
bool timer_on = false;
list<Packet *> packetsToSend;
list<Packet *> packetsSent;
//Open the file and prepare the packets for transmission
ifstream transferFile(fileName);
ofstream seqLog(seqFile);
ofstream ackLog(ackFile);
if (!(seqLog.is_open() && ackLog.is_open())) {
return 1;
}
if (transferFile.is_open()) {
char buffer[Packet::MAX_DATA_LENGTH];
while(false == transferFile.eof()) {
transferFile.read(buffer, Packet::MAX_DATA_LENGTH);
Packet* packet = Packet::createPacket(seqNum, transferFile.gcount(), buffer);
packetsToSend.insert(packetsToSend.end(), packet);
LOG("Inserted packet %i in the queue\n", totalPackets);
seqNum++;
seqNum %= Packet::MAX_SEQ_NUMBER;
totalPackets++;
totalBytes += packet->getLength();
}
} else {
LOG("The input file was not found..\n");
return 1;
}
transferFile.close();
//Add EOT packet
Packet *eotPacket = Packet::createEOT(seqNum);
packetsToSend.insert(packetsToSend.end(), eotPacket);
totalPackets++;
LOG("Packets ready for transmission: %i\n", totalPackets);
LOG("Total data to be sent: %i\n", totalBytes);
//open a udp socket and listen for str
UDPSocket udpSocket;
int ret = udpSocket.open(senderPort);
ASSERT(ret == 0);
LOG("Sender is transmitting & receiving on UDP Port %i\n", senderPort);
/**
* Core Logic
* The sender can be in three states
* 1. SEND_DATA : Sends a packet as long as data is available and window size is permitted
* 2. RECV_ACK : Receives an acknowledgement for a previously sent data
* 3. RESEND_DATA: If an ACK is not received for a previously sent data within timer, resend the data
*/
while ((packetsToSend.size() > 0) || (packetsSent.size() > 0)) {
if (udpSocket.hasData()) {
g_state = SENDER_RECV_ACK;
}
switch(g_state)
{
/**
* Within the WINDOW_SIZE, if data is available, send it.
* Remove it from packetsToSend, and add it to packetsSent
* If timer is off, turn it on.
*/
case SENDER_SEND_DATA: {
if (packetsSent.size() < WINDOW_SIZE && packetsToSend.size() > 0) {
list<Packet *>::iterator itr = packetsToSend.begin();
Packet *packet = (*itr);
char *packetData = packet->getUDPData();
udpSocket.write(remoteIp, remotePort, packetData, packet->getUDPSize());
sentPackets++;
sentBytes += packet->getLength();
seqLog << packet->getSeqNum() << endl;
LOG("Sent packet seqnum %i, packet number %i\n", packet->getSeqNum(), sentPackets);
LOG("Sent bytes: %i\n", sentBytes);
if (false == timer_on) {
alarm(TIMER_SECS);
timer_on = true;
}
free(packetData);
packetsToSend.remove(packet);
packetsSent.insert(packetsSent.end(), packet);
}
}
break;
/**
* 1. RECV Packet.
* 2. Check if the ack number belongs to any packets in packetsSent.
* 3. If yes, delete all packets upto and before.
* 4. If not, discard packet
* 5. If any packets are sent and not recieved ack, start timer again.
*/
case SENDER_RECV_ACK: {
char buffer[Packet::MAX_PACKET_LENGTH];
unsigned long ip;
int port;
int length = Packet::MAX_PACKET_LENGTH;
udpSocket.read(buffer, length, ip, port);
Packet *packet = Packet::parseUDPData(buffer);
int seqNum = packet->getSeqNum();
ackLog << seqNum << endl;
//since it is cumulative keep deleting until seq num is found on packetsSent
list<Packet *>::iterator itr = packetsSent.begin();
while (itr != packetsSent.end() && comparePacket((*itr)->getSeqNum(), seqNum) <= 0) { //less than or equal
Packet *sentPacket = (*itr);
packetsSent.remove(sentPacket);
itr = packetsSent.begin();
delete(sentPacket);
}
delete(packet);
if (packetsSent.size() > 0) {
alarm(TIMER_SECS);
}
g_state = SENDER_SEND_DATA;
}
break;
/**
* 1. Resend data if timeout.
* 2. Send all packets in packetsToSend
*/
case SENDER_RESEND_DATA: {
for (list<Packet *>::iterator itr = packetsSent.begin(); itr != packetsSent.end(); ++itr) {
Packet *packet = (*itr);
char *packetData = packet->getUDPData();
udpSocket.write(remoteIp, remotePort, packetData, packet->getUDPSize());
seqLog << packet->getSeqNum() << endl;
LOG("Resent packet seqnum %i\n", packet->getSeqNum());
if (false == timer_on) {
alarm(TIMER_SECS);
timer_on = true;
}
free(packetData);
}
}
break;
default: {
ASSERT(0); //invalid state
}
}
}
LOG("End of Transmission. Exiting \n");
udpSocket.close();
seqLog.close();
ackLog.close();
ASSERT(totalBytes == sentBytes);
ASSERT(totalPackets == sentPackets);
return 0;
}
int main(int argc, char *argv[]) {
//parse args
if (argc != 5) {
std::cout << "This program requires 4 arguments in the following format!" << std::endl;
std::cout << "receiver <ipAddress of network emulator> <udp port of emulator to receive ACKs from receiver>" << endl
<< "<udp port number used by receiver to receive data> <fileName>" << std::endl;
std::cout << "Example: receiver 192.123.45.87 49999 11235 recv_test.txt" << std::endl;
return 1;
}
const char* ipAddr = argv[1];
if (0 == strcmp(ipAddr, "localhost")) {
ipAddr = "127.0.0.1";
}
unsigned long remoteIp = inet_addr(ipAddr);
int remotePort = atoi(argv[2]);
int receiverPort = atoi(argv[3]);
const char *recvFile = argv[4];
list<Packet *> packetsReceived;
unsigned int totalBytes = 0;
unsigned int expectingSeqNum = 0;
bool firstPacketReceived = false;
//create a udp socket
UDPSocket udpSocket;
udpSocket.open(receiverPort);
LOG("Receiver opened UDP port at %i\n", receiverPort);
ofstream arrivalLog(arrivalFile);
if (!arrivalLog.is_open()) {
LOG("Arrival log file cannot be opened\n");
return 1;
}
/**
* RECV Packet.
* If the sequence number is expected, add it to packets list. Send Ack.
* If not discard and send previous ack.
*/
while (true) {
char buf[Packet::MAX_PACKET_LENGTH];
unsigned long ip; int port;
udpSocket.read(buf, Packet::MAX_PACKET_LENGTH, ip, port);
Packet *packet = Packet::parseUDPData(buf);
arrivalLog << packet->getSeqNum() << endl;
LOG("Received packet %i, length %i\n", packet->getSeqNum(), packet->getLength());
if ((unsigned int) packet->getSeqNum() == expectingSeqNum) {
if (packet->getType() == 1) { //data packet
sendAckPacket(udpSocket, expectingSeqNum, remoteIp, remotePort);
totalBytes += packet->getLength();
LOG("Received %i bytes\n", totalBytes);
expectingSeqNum++;
expectingSeqNum %= Packet::MAX_SEQ_NUMBER;
packetsReceived.insert(packetsReceived.end(), packet);
LOG("Total packets received %i\n", (unsigned int) packetsReceived.size());
if (false == firstPacketReceived) {
firstPacketReceived = true;
}
} else if (packet->getType() == 2) { //eot packet
LOG("EOT Packet received.. \n");
sendEotPacket(udpSocket, expectingSeqNum, remoteIp, remotePort);
break;
}
} else {
if (true == firstPacketReceived) {
int previousSeqNum = expectingSeqNum - 1;
previousSeqNum = (previousSeqNum + Packet::MAX_SEQ_NUMBER) % Packet::MAX_SEQ_NUMBER;
sendAckPacket(udpSocket, previousSeqNum, remoteIp, remotePort);
}
delete(packet);
}
}
udpSocket.close();
LOG("Received %u packets \n", (unsigned int) packetsReceived.size());
//Write to a file.
ofstream transferFile(recvFile);
if (transferFile.is_open()) {
for (list<Packet *>::iterator itr = packetsReceived.begin(); itr != packetsReceived.end(); ++itr) {
Packet *packet = (*itr);
transferFile.write(packet->getData(), packet->getLength());
delete(packet);
}
}
LOG("Finished writing %u bytes to the file\n", totalBytes);
transferFile.close();
arrivalLog.close();
return 0;
}