/*
This will send hello message to the beacon node and intiated the connection.
*/
int sendHelloBeacon(Node* nei){
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(inet_addr(getIPAddr(nei->hostname)));
serv_addr.sin_port = htons(nei->port);
memset(&(serv_addr.sin_zero), 0, 8);
Message* hello = (Message*)malloc(sizeof(Message));
prepareHello(hello);
//this is to make sure that port is available for reuse after server shutdown
for(;;){
if(nei->terminate || isShutdown || softshutdown){
return -1;
}
Node * other = findNode(nei, conhead);
if((other != NULL) && (other->isHelloDone == 1)){
return -1;
}
nei->sock_id = socket(AF_INET, SOCK_STREAM, 0);
if(connect(nei->sock_id, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) >= 0){
if(sendMessage(nei->sock_id, hello, nei->nodeId) == 0){
nei->isHelloDone = 1;
break;
}
}
//printf("sleeping %s\n", nei->nodeId);
sleep(retry);
}
return 0;
}
/**
* Handles changes in the IP-address field.
*/
void MainWindow::E_IPAddr_textChanged(){
if(getIPAddr()){
ui_->PB_ON->setEnabled(1);
}else{
ui_->PB_ON->setEnabled(0);
}
}
/**
* Sets availability of controls when TCP protocol is chosen
*/
void MainWindow::RB_TCP_clicked(){
ui_->E_IPAddr->setEnabled(1);
ui_->CB_CWR->setEnabled(1);
ui_->CB_ECN->setEnabled(1);
ui_->CB_URG->setEnabled(1);
ui_->CB_ACK->setEnabled(1);
ui_->CB_PSH->setEnabled(1);
ui_->CB_RST->setEnabled(1);
ui_->CB_SYN->setEnabled(1);
ui_->CB_FIN->setEnabled(1);
if(getIPAddr()){
ui_->PB_ON->setEnabled(1);
}else{
ui_->PB_ON->setEnabled(0);
}
}
/* This function searches for the resource(sid:uri) in the ResourceList.
* If the Resource is found in the list then it returns 0 else insert
* the resource to front of the list and returns 1.
*/
int insertResource(const char * sid, char const * uri,
const OCClientResponse * clientResponse)
{
ResourceNode * iter = resourceList;
//Checking if the resource(sid:uri) is new
while(iter)
{
if((strcmp(iter->sid, sid) == 0) && (strcmp(iter->uri, uri) == 0))
{
return 0;
}
else
{
iter = iter->next;
}
}
//Creating new ResourceNode
if((iter = (ResourceNode *) OICMalloc(sizeof(ResourceNode))))
{
iter->sid = sid;
iter->uri = uri;
iter->ip = getIPAddr(clientResponse);
iter->port = getPort(clientResponse);
iter->connType = clientResponse->connType;
iter->next = NULL;
}
else
{
OC_LOG(ERROR, TAG, "Memory not allocated to ResourceNode");
return -1;
}
//Adding new ResourceNode to front of the ResourceList
if(!resourceList)
{
resourceList = iter;
}
else
{
iter->next = resourceList;
resourceList = iter;
}
return 1;
}
/*
This will send hello message to the non beacon node and intiated the connection.
*/
int sendHelloNonBeacon(Node* nei){
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(inet_addr(getIPAddr(nei->hostname)));
serv_addr.sin_port = htons(nei->port);
memset(&(serv_addr.sin_zero), 0, 8);
Message* hello = (Message*)malloc(sizeof(Message));
prepareHello(hello);
//sending hello
nei->sock_id = socket(AF_INET, SOCK_STREAM, 0);
if(connect(nei->sock_id, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) >= 0){
if(sendMessage(nei->sock_id, hello, nei->nodeId) == 0){
nei->isHelloDone = 1;
return 0;
}
}
return -1;
}
int main(){
int opt; //for setsockopt
struct sockaddr_in server_addr, client_addr; //declare structure sockaddr_in of server, client
int socket_fd, client_fd; //declare socket descripter
int len; //message length
char req_buf[BUFFSIZE], res_buf[BUFFSIZE]; //message buffer
int portnum=80; //port number
char* IPAddr; //IPaddress
char host[100];
char URL[500]; //URL
pid_t pid; //pid varialbe for fork
int hash_fd; //file descriptor of hashed file
int semid;
semid=initialize_sem(); //set semaphore initializial state
if((socket_fd = socket(PF_INET, SOCK_STREAM, 0)) <0){ //create socket about server part
printf("Server : Can't open stream socket."); //if can't create, print error message
return 0;
}
bzero((char *)&server_addr, sizeof(server_addr)); //initialize s_server_addr
server_addr.sin_family=AF_INET; //set variables of s_server_addr
///////SET SERVER ADDRESS!!
server_addr.sin_addr.s_addr=inet_addr("128.134.52.60");
//set address of proxy_server
server_addr.sin_port=htons(PORTNO); //set portnumber of my process
opt=1;
setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));//set socket option
//bind s_server_addr and s_socket
if(bind(socket_fd, (struct sockaddr *)&server_addr, sizeof(server_addr))<0){
printf("Server : Can't bind local address.\n"); //if bind error , print message
return 0;
}
listen(socket_fd, 5); //change proxy_server state to wait connection
if(signal(SIGCHLD, sig_handler)==SIG_ERR) //**signal for SIGCHLD
printf("SIGNAL ERROR\n");
if(signal(SIGALRM, sig_handler)==SIG_ERR) //**signal for SIGALRM
printf("SIGNAL ERROR\n");
while(1){
//length of client_addr
len=sizeof(client_addr);
//accept connection request of client(WEB-BROWSER)
client_fd = accept(socket_fd, (struct sockaddr*)&client_addr, &len);
if(client_fd<0) { //if connection fails, print error meesage
printf("Server : accept failed.\n");
}
//**create child process
pid=fork();
if(pid<0) //if fork error
fprintf(stderr, "fork error\n");
else if(pid==0) //Child process
{
bzero(res_buf, BUFFSIZE); //initialize buffer
bzero(req_buf, BUFFSIZE);
printf("===========================================\n");
printf("PID : %d\n",getpid()); //print child process id
read(client_fd, req_buf, BUFFSIZE); //read request message of client
getURL(req_buf, URL);
portnum=getHostname_AND_portnum(req_buf, host);
IPAddr=getIPAddr(host); //hostname swap into IPaddress
printf("* request :\n%s\n",req_buf); //print request message
printf("* host name(%d) : %s\n",getpid(),host); //print host name
printf("* IP address : %s\n", IPAddr); //print IPaddress
//hash_path is hashed file of URL
proxy_cache(URL, hash_path, semid); //check whether HIT or MISS AND get hash_path
hash_fd=open(hash_path, O_RDWR); //open file of hash_path
if(hash_fd==-1) //if file descriptor of hash_path is -1, that file doesn't exist
printf("* ProxyCache(%d) : MISS\n",getpid()); //Thus MISS
else{ //else that file exist
printf("* ProxyCache(%d) : HIT\n",getpid()); //Thus HIT
close(hash_fd); //close file descriptor of hash_path
}
if(hash_fd==-1) //MISS
connect_webserver(IPAddr, portnum, req_buf, URL, semid);
//proxy server as clinet is connected to web-server
hash_fd=open(hash_path, O_RDONLY); //hasehd file open in proxy_cache
while((len=read(hash_fd, res_buf, BUFFSIZE))>0) //read Response message from file
{
write(client_fd, res_buf, len); //write response message to client
bzero(res_buf, BUFFSIZE); //initialize
}
close(client_fd); //close descriptor
close(hash_fd);
return 0;
}
}
return 0;
}