//这个线程处理来自SON进程的进入报文. 它通过调用son_recvpkt()接收来自SON进程的报文.
//如果报文是SIP报文,并且目的节点就是本节点,就转发报文给STCP进程. 如果目的节点不是本节点,
//就根据路由表转发报文给下一跳.如果报文是路由更新报文,就更新距离矢量表和路由表.
void* pkthandler(void* arg) {
sip_pkt_t pkt;
while(son_conn != -1 && son_recvpkt(&pkt,son_conn) > 0)
{
//printf("Routing: received a packet from neighbor %d\n",pkt.header.src_nodeID);
//printf("sip[INFO] dest:%d length:%d type:%d\n",pkt.header.dest_nodeID, pkt.header.length, pkt.header.type);
if(pkt.header.type == ROUTE_UPDATE)
{ // broadcast update
pkt_routeupdate_t *route_update = (pkt_routeupdate_t*)pkt.data;
//preparations
int entry_num = route_update->entryNum;
routeupdate_entry_t *rupentry = route_update->entry;
int src_nodeID = pkt.header.src_nodeID;
int local_nodeID = topology_getMyNodeID();
int nbr_num = topology_getNbrNum();
int node_num = topology_getNodeNum();
//int *nbr_array = topology_getNbrArray();
dv_entry_t *local_dv = NULL;
int i = 0;
int j = 0;
int cost1 = 0;
int cost2 = 0;
printf("SIP got ROUTE_UPDATE pkt from node(%d)\n",src_nodeID);
for(i = 0;i < node_num;i++)
printf("【Recv】update entry %d: nodeID %d \tcost %d\n",i,rupentry[i].nodeID,rupentry[i].cost);
pthread_mutex_lock(dv_mutex);
pthread_mutex_lock(routingtable_mutex);
for(i = 0;i < entry_num;i++)
dvtable_setcost(dv,src_nodeID,rupentry[i].nodeID,rupentry[i].cost);
for(j = 0;j < nbr_num + 1;j++)
if(local_nodeID == dv[j].nodeID)
{
local_dv = dv[j].dvEntry;
break;
}
for(i = 0;i < node_num;i++)
{
int dest_nodeID = local_dv[i].nodeID;
int old_cost = local_dv[i].cost;
//for(j = 0;j < nbr_num;j++)
//{
int medi_nodeID = src_nodeID;
cost1 = nbrcosttable_getcost(nct,medi_nodeID);
cost2 = dvtable_getcost(dv,medi_nodeID,dest_nodeID);
if(cost1 + cost2 < old_cost)
{
printf("update dvtable and routingtable\n");
dvtable_setcost(dv,local_nodeID,dest_nodeID,cost1+cost2);
routingtable_setnextnode(routingtable,dest_nodeID,medi_nodeID);
}
//}
}
pthread_mutex_unlock(dv_mutex);
pthread_mutex_unlock(routingtable_mutex);
}
else if(pkt.header.type == SIP)
{
int local_nodeID = topology_getMyNodeID();
if(pkt.header.dest_nodeID == local_nodeID)
{ //forward pkt to stcp
printf("SIP forward pkt to STCP\n");
forwardsegToSTCP(stcp_conn,pkt.header.src_nodeID,(seg_t*)pkt.data);
}
else
{ //forward pkt to son
int next_nodeID = routingtable_getnextnode(routingtable,pkt.header.dest_nodeID);
son_sendpkt(next_nodeID,&pkt,son_conn);
printf("SIP forward pkt to SON to node %d\n",next_nodeID);
}
}
}
close(son_conn);
son_conn = -1;
pthread_exit(NULL);
}
//这个线程处理来自SON进程的进入报文. 它通过调用son_recvpkt()接收来自SON进程的报文.
//如果报文是SIP报文,并且目的节点就是本节点,就转发报文给STCP进程. 如果目的节点不是本节点,
//就根据路由表转发报文给下一跳.如果报文是路由更新报文,就更新距离矢量表和路由表.
void* pkthandler(void* arg)
{
sip_pkt_t pkt;
int myNodeID = topology_getMyNodeID();
int nbr_num = topology_getNbrNum();
int node_num = topology_getNodeNum();
while(son_recvpkt(&pkt,son_conn)>0) {
// printf("Routing: received a packet from neighbor %d\n",pkt.header.src_nodeID);
switch(pkt.header.type){
case ROUTE_UPDATE:
pthread_mutex_lock(dv_mutex);
pthread_mutex_lock(routingtable_mutex);
pkt_routeupdate_t *routemsg = (pkt_routeupdate_t *)pkt.data;
int i, j, srcNode = pkt.header.src_nodeID;
printf("receive ROUTE UPDATE MESSAGE FROM NODE %d\n", srcNode);
for(j = 0; j < routemsg->entryNum; j ++)
dvtable_setcost(dv, srcNode, routemsg->entry[j].nodeID, routemsg->entry[j].cost);
for(i = 0;i < nbr_num + 1;i ++) {
if(myNodeID == dv[i].nodeID)
break;
}
dv_entry_t *myEntry = dv[i].dvEntry;
int *nbr = topology_getNbrArray();
for(i = 0; i < node_num; i ++) {
int destNode = myEntry[i].nodeID;
for(j = 0;j < nbr_num;j ++) {
int viaNode = nbr[j];
int firstCost = nbrcosttable_getcost(nct, viaNode);
int lastCost = dvtable_getcost(dv, viaNode, destNode);
if(firstCost + lastCost < dvtable_getcost(dv, myNodeID, destNode)) {
printf("now update routing table\n");
printf("to destNode %d via nextNode %d \n", destNode, viaNode);
dvtable_setcost(dv, myNodeID, destNode, firstCost + lastCost);
routingtable_setnextnode(routingtable, destNode, viaNode);
}
}
}
pthread_mutex_unlock(routingtable_mutex);
pthread_mutex_unlock(dv_mutex);
break;
case SIP:
if(pkt.header.dest_nodeID == topology_getMyNodeID()){
seg_t seg_data;
memcpy(&seg_data, pkt.data, sizeof(seg_t));
printf("RECEIVE PKT, destNode is me ");
if(forwardsegToSTCP(stcp_conn, pkt.header.src_nodeID, &seg_data) == -1)
printf("failed forwarding the seg to local STCP \n");
else
printf("FORWARD the seg to local STCP \n");
}
else{
pthread_mutex_lock(routingtable_mutex);
int nextNodeID = routingtable_getnextnode(routingtable, pkt.header.dest_nodeID);
pthread_mutex_unlock(routingtable_mutex);
if(son_sendpkt(nextNodeID, &pkt, son_conn) == -1)
printf("can't send pkt to son \n");
else
printf("RECEIVE PKT but DESTNODE is %d SO TRANSMIT it to nextNodeID %d\n",
pkt.header.dest_nodeID, nextNodeID);
}
break;
}
}
pthread_exit(NULL);
}
//这个线程处理来自SON进程的进入报文. 它通过调用son_recvpkt()接收来自SON进程的报文.
//如果报文是SIP报文,并且目的节点就是本节点,就转发报文给STCP进程. 如果目的节点不是本节点,
//就根据路由表转发报文给下一跳.如果报文是路由更新报文,就更新距离矢量表和路由表.
void* pkthandler(void* arg) {
//你需要编写这里的代码.
printf("we are now in pkthandler in sip!\n");
sip_pkt_t pkt;
int slot_num;
routingtable_entry_t *ptr;
int myID = topology_getMyNodeID();
while(son_recvpkt(&pkt,son_conn) > 0) {
if (pkt.header.type == SIP) {
printf("Routing: received a packet from neighbor %d\n",pkt.header.src_nodeID);
//printf("---the received dest_nodeID is %d\n", pkt.header.dest_nodeID);
//printf("---the received length is %d\n", pkt.header.length);
//printf("---the received type is SIP\n");
if (pkt.header.dest_nodeID == myID) {
forwardsegToSTCP(stcp_conn, pkt.header.src_nodeID, (seg_t*)pkt.data);
switch(((seg_t*)(pkt.data))->header.type) {
case 0:
printf("SIP forward up the seg --SYN-- to the STCP!\n");
break;
case 1:
printf("SIP forward up the seg --SYNACK-- to the STCP!\n");
break;
case 2:
printf("SIP forward up the seg --FIN-- to the STCP!\n");
break;
case 3:
printf("SIP forward up the seg --FINACK-- to the STCP!\n");
break;
case 4:
printf("SIP forward up the seg --DATA-- to the STCP! and the service is %d the message is %s\n", ((struct packet_IM*)(((seg_t*)(pkt.data))->data))->service, ((struct packet_IM*)(((seg_t*)(pkt.data))->data))->message);
break;
case 5:
printf("SIP forward up the seg --DAYAACK-- to the STCP!\n");
break;
}
}
else {
slot_num = makehash(pkt.header.dest_nodeID);
ptr = routingtable->hash[slot_num];
while (ptr != NULL) {//寻找是否存在给定目的节点的路由条目
if (pkt.header.dest_nodeID == ptr->destNodeID)
break;
ptr = ptr->next;
}
if (ptr != NULL) {//根据路由表转发报文给下一跳
son_sendpkt(ptr->nextNodeID, &pkt, son_conn);
printf("SIP forward down the seg to the SON, the nextnode%d!\n", ptr->nextNodeID);
}
}
}
else if (pkt.header.type == ROUTE_UPDATE) {
/*================本实验精华所在================*/
//printf("---the received type is ROUTE_UPDATE\n");
pkt_routeupdate_t *routeUp = (pkt_routeupdate_t *)pkt.data;
pthread_mutex_lock(dv_mutex);
pthread_mutex_lock(routingtable_mutex);
int i, j, srcNode = pkt.header.src_nodeID;
int entryNum = topology_getNodeNum(), nbrNum = topology_getNbrNum();
for(j = 0;j < entryNum;j ++)
dvtable_setcost(dv, srcNode,routeUp->entry[j].nodeID, routeUp->entry[j].cost);
for(i = 0;i < entryNum;i ++) {
if(topology_getMyNodeID() == (dv + i)->nodeID)
break;
}
dv_entry_t *myEntry = (dv + i)->dvEntry;
int *nbr = topology_getNbrArray();
for(i = 0;i < entryNum;i ++) {
srcNode = topology_getMyNodeID();
int destNode = (myEntry + i)->nodeID;
for(j = 0;j < nbrNum;j ++) {
int midNode = *(nbr + j);
int firstCost = nbrcosttable_getcost(nct, midNode);
int lastCost = dvtable_getcost(dv, midNode, destNode);
if(firstCost + lastCost < dvtable_getcost(dv, srcNode, destNode)) {
dvtable_setcost(dv, srcNode, destNode, firstCost + lastCost);
routingtable_setnextnode(routingtable, destNode, midNode);
}
}
}
pthread_mutex_unlock(routingtable_mutex);
pthread_mutex_unlock(dv_mutex);
}
else {
printf("error type\n");
//exit(0);
}
}
close(son_conn);
son_conn = -1;
printf("we are now off pkthandler!\n");
pthread_exit(NULL);
}