int main(int argc, char *argv[])
{
printf("SIP layer is starting, pls wait...\n");
topology_analysis();
//初始化全局变量
nct = nbrcosttable_create();
dv = dvtable_create();
dv_mutex = (pthread_mutex_t*)malloc(sizeof(pthread_mutex_t));
pthread_mutex_init(dv_mutex,NULL);
routingtable = routingtable_create();
routingtable_mutex = (pthread_mutex_t*)malloc(sizeof(pthread_mutex_t));
pthread_mutex_init(routingtable_mutex,NULL);
son_conn = -1;
stcp_conn = -1;
nbrcosttable_print(nct);
dvtable_print(dv);
routingtable_print(routingtable);
//注册用于终止进程的信号句柄
signal(SIGINT, sip_stop);
//连接到本地SON进程
son_conn = connectToSON();
if(son_conn<0) {
printf("can't connect to SON process\n");
exit(1);
}
//启动线程处理来自SON进程的进入报文
pthread_t pkt_handler_thread;
pthread_create(&pkt_handler_thread,NULL,pkthandler,(void*)0);
//启动路由更新线程
pthread_t routeupdate_thread;
pthread_create(&routeupdate_thread,NULL,routeupdate_daemon,(void*)0);
printf("SIP layer is started...\n");
printf("waiting for routes to be established\n");
sleep(SIP_WAITTIME);
dvtable_print(dv);
routingtable_print(routingtable);
//等待来自STCP进程的连接
printf("waiting for connection from STCP process\n");
waitSTCP();
}
int main()
{
dv_t* dv_table;
routingtable_t* route_table;
nbr_cost_entry_t* nbr_ct;
nbr_ct = nbrcosttable_create();
nbrcosttable_print(nbr_ct);
printf("--------------- create dv table--------------------\n");
dv_table = dvtable_create();
printf("--------------- create dv table--------------------\n");
dvtable_print(dv_table);
printf("--------------- create route table--------------------\n");
route_table = routingtable_create();
printf("--------------- create route table--------------------\n");
routingtable_print(route_table);
nbrcosttable_destroy(nbr_ct);
dvtable_destroy(dv_table);
routingtable_destroy(route_table);
return 0;
}
int route_dvt_update(nbr_cost_entry_t *nct, dv_t *dvt, routingtable_t * rtt,
pkt_routeupdate_t *data, int updater, pthread_mutex_t *dv_mutex) {
int my_node_id = topology_getMyNodeID();
int nbr_count = topology_getNbrNum();
int entry_num = data -> entryNum;
int i, modified = 0;
pthread_mutex_lock(dv_mutex);
dv_entry_t * my_dv_entry = NULL;
for (i = 0; i < nbr_count + 1; ++i) {
if (dvt[i].nodeID == my_node_id)
my_dv_entry = dvt[i].dvEntry;
}
if (my_dv_entry == NULL) {
printf("panic: cannot find my own dist-vec entry\n");
} else {
int curr_fmtu = dvtable_getcost(dvt, my_node_id, updater);
for (i = 0; i < entry_num; ++i) {
if ( curr_fmtu + data -> entry[i].cost <
dventry_getcost(my_dv_entry, data -> entry[i].nodeID)) {
dventry_setcost(my_dv_entry, data -> entry[i].nodeID,
curr_fmtu + data -> entry[i].cost);
routingtable_setnextnode(rtt, data -> entry[i].nodeID, updater);
modified = 1;
}
}
}
dv_entry_t * updater_dv_entry = NULL;
for (i = 0; i < nbr_count + 1; ++i) {
if (dvt[i].nodeID == updater)
updater_dv_entry = dvt[i].dvEntry;
}
if (updater_dv_entry == NULL) {
printf("panic: cannot find updater's dist-vec entry\n");
} else {
for (i = 0; i < entry_num; ++i) {
if (dventry_getcost(updater_dv_entry, data -> entry[i].nodeID) >
data -> entry[i].cost)
dventry_setcost(updater_dv_entry, data -> entry[i].nodeID, data -> entry[i].cost);
}
}
pthread_mutex_unlock(dv_mutex);
if (modified) dvtable_print(dvt);
return 1;
}
