/**
* Create a DATA message. seqNum = sequence number of the packet
*/
Packet *Message::make_data_packet(int seqNum){
Packet *data_packet;
data_packet = new Packet();
//Header
PacketHdr *hdr = data_packet->accessHeader();
hdr->setIntegerInfo(SENDER_ID, ID_POS);
hdr->setShortIntegerInfo(DATA_MESSAGE_TYPE, TYPE_POS);
hdr->setIntegerInfo(seqNum,SEQNUM_POS); //sequence number
if(seqNum == number_of_packets_){
hdr->setShortIntegerInfo(1,EOF_POS);
}else{
hdr->setShortIntegerInfo(0,EOF_POS);
}
//Payload
int payload_size;
if(seqNum == number_of_packets_){
payload_size = length_ - (number_of_packets_ - 1) * DATA_SIZE;
}
else{
payload_size = DATA_SIZE;
}
char *data_chunk = new char[payload_size];
//read the file
ifstream f1(filename_);
f1.seekg(0, ios::end);
int pos = (seqNum - 1) * DATA_SIZE;
f1.seekg(pos);
f1.read(data_chunk, payload_size);
f1.close();
data_packet->fillPayload(payload_size, data_chunk);
return data_packet;
}
/**
* Create an ACK message
*/
Packet *Message::make_ack_packet(int seqNum){
Packet *ack_packet;
ack_packet = new Packet();
ack_packet->setPayloadSize(0);
//Header
PacketHdr *hdr = ack_packet->accessHeader();
hdr->setIntegerInfo(RECEIVER_ID, ID_POS);
hdr->setShortIntegerInfo(ACK_MESSAGE_TYPE, TYPE_POS);
hdr->setIntegerInfo(seqNum, SEQNUM_POS); // sequence number being ACKED
return ack_packet;
}
/**
* Create a new init message, with the name of the file being transfered
*/
Packet *Message::make_init_packet(char* filename){
Packet * init_packet;
init_packet = new Packet();
init_packet->setPayloadSize(INIT_SIZE);
//Header
PacketHdr *hdr = init_packet->accessHeader();
hdr->setIntegerInfo(SENDER_ID, ID_POS);
hdr->setShortIntegerInfo(INIT_MESSAGE_TYPE, TYPE_POS);
hdr->setIntegerInfo(0,SEQNUM_POS); //sequence number
//Payload
int len = strlen(filename);
init_packet->fillPayload(len, filename);
return init_packet;
}
void *interface4(void *arg){
printf("Starting interface4 thread\n");
struct cShared *sh = (struct cShared *)arg;
cout<<"This is interface4!"<<endl;
Packet *recvPacket;
PacketHdr *hdr;
char type;
int cid;
int hid;
int hopnum;
int interface;
while(1){
// sleep(0.4);
recvPacket = sh->recv_port4->receivePacket();
if(recvPacket!=NULL){
hdr = recvPacket->accessHeader();
type = hdr->getOctet(0);
//receive update packet: [type+cid+#hops]
if(type==(char)0X02){
int k=0;
struct routing_Table *temp=new routing_Table;
struct routing_Table *ptr=NULL;
cid=hdr->getIntegerInfo(1);
hopnum=hdr->getIntegerInfo(5);
temp->CID=cid;
temp->interf=4;
temp->hopNum=hopnum;
temp->nextrow=NULL;
temp->previous=NULL;
// updated in 0903 start
// time_t t=time(0);
int t=0;
// updated in 0903 end
temp->TtoE=t+TTL;
ptr=sh->rtable;
//update the routing table
while(ptr!=NULL){
if(ptr->CID==temp->CID){
k=1;
if(ptr->hopNum >= temp->hopNum){
ptr->interf=4;
ptr->hopNum=temp->hopNum;
ptr->TtoE=temp->TtoE;
//broadcast updated packet
hdr->setIntegerInfo(hopnum+1,5);
sh->send_port2->sendPacket(recvPacket);
sh->send_port3->sendPacket(recvPacket);
sh->send_port1->sendPacket(recvPacket);
}
else if(ptr->hopNum==temp->hopNum&&ptr->interf==temp->interf){
ptr->TtoE=temp->TtoE;
}
}
ptr=ptr->nextrow;
}
if(k==0){
temp->nextrow=sh->rtable;
sh->rtable->previous=temp;
sh->rtable=temp;
//broadcast updated packet
hdr->setIntegerInfo(hopnum+1,5);
sh->send_port2->sendPacket(recvPacket);
sh->send_port3->sendPacket(recvPacket);
sh->send_port1->sendPacket(recvPacket);
}
//}
//delete ptr;
}
//receive response packet: [type+cid+hid+payload]
else if(type==(char)0x01){
int k=0;
struct pending_Table *ptr=NULL;
ptr=sh->ptable;
cid=hdr->getIntegerInfo(1);
hid=hdr->getIntegerInfo(5);
//find the path in pending table
while(ptr!=NULL){
if(ptr->rCID==cid && ptr->HID==hid){
interface=ptr->interf;
k=1;
//decided which interface should send the packet
switch(interface){
case 1:
sh->send_port1->sendPacket(recvPacket);
break;
case 2:
sh->send_port2->sendPacket(recvPacket);
break;
case 3:
sh->send_port3->sendPacket(recvPacket);
break;
case 4:
sh->send_port4->sendPacket(recvPacket);
break;
default:
cout<<"Cannot found path!"<<endl;
break;
}
}
if(k==1)
break;
}
//cout<<"Delivery Error!"<<endl;
//delete ptr;
}
//receive request packet: [type+cid+hid]
else{
int k=0;
int k1=0;
struct pending_Table *ptemp=new pending_Table;
struct pending_Table *pptr=NULL;
struct routing_Table *rptr=NULL;
cid=hdr->getIntegerInfo(1);
hid=hdr->getIntegerInfo(5);
pptr=sh->ptable;
rptr=sh->rtable;
ptemp->rCID=cid;
ptemp->HID=hid;
ptemp->interf=4;
// updated in 0903 start
// time_t t=time(0);
int t=0;
// updated in 0903 end
ptemp->TtoE=t+rTTL;
ptemp->nextrow=NULL;
ptemp->previous=NULL;
//update the pending table
while(pptr!=NULL){
if(pptr->rCID==ptemp->rCID && pptr->HID==ptemp->HID){
k=1;
//reset TtoE
break;
}
pptr=pptr->nextrow;
}
if(k==0){
ptemp->nextrow=sh->ptable;
sh->ptable->previous=ptemp;
sh->ptable=ptemp;
}
//figure the path out with routing table
while(rptr!=NULL){
if(rptr->CID==ptemp->rCID){
k1=1;
interface=rptr->interf;
//decided which interface should send the packet
switch(interface){
case 1:
sh->send_port1->sendPacket(recvPacket);
break;
case 2:
sh->send_port2->sendPacket(recvPacket);
break;
case 3:
sh->send_port3->sendPacket(recvPacket);
break;
case 4:
sh->send_port4->sendPacket(recvPacket);
break;
default:
cout<<"Cannot found path!"<<endl;
break;
}
}
if(k1==1)
break;
rptr=rptr->nextrow;
}
if(k1==0)
cout<<"Cannot found such content!"<<endl;
//delete pptr;
//delete rptr;
//delete ptemp;
}
//delete recvPacket;
struct routing_Table *p=NULL;
p=sh->rtable;
cout<<"The Routing Table is:"<<endl;
cout<<"ContentID"<<setw(10)<<"Interface"<<setw(6)<<"#Hops"<<setw(5)<<"TtoE"<<endl;
while(p->nextrow!=NULL){
cout<<setw(7)<<p->CID<<setw(10)<<p->interf;
// cout<<setw(5)<<p->hopNum<<setw(7)<<p->TtoE-time(0)<<endl;
cout<<setw(5)<<p->hopNum<<setw(7)<<p->TtoE-0<<endl;
p=p->nextrow;
}
struct pending_Table *t=NULL;
t=sh->ptable;
cout<<"The Pending Table is:"<<endl;
cout<<"RequstCID"<<setw(7)<<"HostID"<<setw(10)<<"Interface"<<setw(10)<<"TimeToExp"<<endl;
while(t->nextrow!=NULL){
cout<<setw(7)<<t->rCID<<setw(7)<<t->HID;
// cout<<setw(9)<<t->interf<<setw(10)<<t->TtoE-time(0)<<endl;
cout<<setw(9)<<t->interf<<setw(10)<<t->TtoE-0<<endl;
t=t->nextrow;
}
}
}
return NULL;
}