int main(int argc,char **argv)
{
int sock = socket(PF_INET, SOCK_DGRAM, 0);
struct sockaddr_in address;
int errors=0;
if (sock<0) {
perror("socket");
return 1;
};
address.sin_family = AF_INET;
address.sin_port = htons(44444);
address.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(sock,(struct sockaddr *)&address,sizeof(address))<0) {
perror("bind");
return 1;
}
signal(SIGUSR1, printlist);
daemonise(argv[0]);
put_pid("wansd");
openlog(argv[0],LOG_PID,LOG_DAEMON);
syslog(LOG_NOTICE,"%s started.",argv[0]);
for (;;) {
int addrlen=sizeof(address);
char buffer[65536];
int data=recvfrom(sock,(void *)buffer,sizeof(buffer),0,
(struct sockaddr *)&address,&addrlen);
if (data<0) {
errors++;
sleep(1);
if (errors>10) {
syslog(LOG_ERR,"recvfrom: %m\n");
syslog(LOG_ERR,"Too many errors, bailing.\n");
return 1;
}
} else {
errors=0;
}
buffer[sizeof(buffer)-1]='\0';
sendupdate(sock,dopacket(buffer,data,address));
};
return 0;
}
int main(int argc,char** argv){
int yes = 1;
int i,j,rv;
char *commands ;
int length = 0 ;
char array[100];
char *cmdargs;
char *res ;
cmdargs = array;
head = NULL ;
headRef = &head;
int ln1;
int obytes ;
int retSel;
char ipremote[INET_ADDRSTRLEN];
/* Bufferrs for read and write */
char buf[350] ;
char opbuff[350];
if(argc != 3){
printf("Invalid call ..exiting............\n");
exit(0);
}
if(strcasecmp(argv[1],"s") != 0 && strcasecmp(argv[1],"c") != 0 ){
printf("Invalid arguments ..exiting............\n");
exit(0);
}
int iport ;
iport = atoi(argv[2]);
if(iport <= 1024 || iport > 45355){
printf("Invalid port ..exiting............\n");
exit(0);
}
/* Setting the client or server flag */
if(strcasecmp(argv[1],"S")== 0 ){
serverclientflag = 1;
}else{
serverclientflag = 2 ;
}
portnum = argv[2]; // setting the portnum to global variable
//Method to initialise the system
initialize();
for(;;){
read_fds = master ;
if(select(fdmax + 1,&read_fds,NULL,NULL,NULL) == -1){
perror("select");
exit(4);
}
//run through the existing connections looking for data
for(i=0 ; i<= fdmax ; i++){
if(FD_ISSET(i,&read_fds)){ // we got one conncetion
if(i == 0){
//read the command from the terminal
//printf("[PA1]$");
if((res=fgets(cmd,sizeof cmd,stdin) )!= NULL){
length = strlen(cmd);
cmd[length-1] = '\0';
//fflush(stdin);
commands = cmd ;
returnfd = processCommand(commands,serverclientflag,portnum); //get the file descriptor for server connection
fflush(stdout);
if(returnfd == -1){
printf("Invalid arguments to command.");
fflush(stdout);
printf("\n[PA1]$:");
fflush(stdout);
}
}
}else{
if(i == listener){
//handle new connection accept the connection and add it to the read set
addrlen = sizeof remoteaddr ;
newfd = accept(listener,(struct sockaddr *)&remoteaddr,&addrlen);
if(newfd == -1){
perror("accept");
} else{
/* Getting the ip address of the remote connection */
/*And adding the connection to list*/
struct sockaddr_in *s = (struct sockaddr_in *)&remoteaddr;
struct hostent *hnet;
inet_ntop(AF_INET, &s->sin_addr, ipremote, sizeof ipremote);
int port = s->sin_port;
char tempport[33];
sprintf(tempport,"%d",port);
//hnet = gethostbyaddr(&ipremote,sizeof ipremote,AF_INET);
if(serverclientflag == 1){
getConnectDetails(newfd,tempport,&head,ipremote);
}else{
getConnectDetails(newfd,tempport,&headConnectdNode,ipremote);
}
//adding the connection details in the memory
//addClientstoList(&headConnectdNode,ipremote,portnum,hnet->h_name,iconnid,i);
//portnum;
printf("----------A new connection requested from :%s",inet_ntop(remoteaddr.ss_family,get_in_addr((struct sockaddr*)&remoteaddr),remoteIP,INET6_ADDRSTRLEN));
printf ("\n---------------------Connected to :%s-----------\n",inet_ntop(remoteaddr.ss_family,get_in_addr((struct sockaddr*)&remoteaddr),remoteIP,INET6_ADDRSTRLEN));
FD_SET(newfd,&master);
//End Send the updated list of clients
if(newfd > fdmax){
fdmax = newfd ;
}
// process register command
}
}else{
/*handle data from the client
clear the data from the buffer
*/
if((nbytes = recv(i,buf,sizeof buf,0)) <= 0 ){
fflush(stdout);
if(nbytes == 0 ){
//connection closed
if(serverclientflag == 1){
//Reset the client list and push data to other clients
updateClientList(i,serverclientflag) ;
buildclist(head);
sendupdate(i,listener);
}else{
updateClientList(i,serverclientflag);
iconnid = iconnid - 1 ;
}
printf("\n[PA1]$:");
fflush(stdout);
}else{
perror("recv");
printf("\n wrog connection");
}
//close(i);
FD_CLR(i,&master);
printf("\n[PA1]$:");
}else{
//printf("\n Bytes received is %d",nbytes);
//we have data from the client
//buf[nbytes] ='\0';
//printf("\nBytes %d",nbytes) ;
//Get the data about the server
if(serverclientflag == 1){
//Adding the server details first
//getClientDetails(i,buf,&head);
char ips[INET6_ADDRSTRLEN] ;
char *rip = ips ;
updateConnctdPort(i,buf,&head,rip);
//addClientstoList(&head,ipaddress,portnum,"dokken.cse.buffalo.edu",1);
ln1 =buildclist(head);
strcpy(opbuff,sbcheckdata);
obytes = send(i,opbuff,sizeof opbuff,0);
if(obytes < 0){
perror("senddata");
}
//obytes = send(i,"HEllo",6,0);
fflush(stdout);
//printf("\n Bytes transferred %d",obytes);
}else{
processCmd(buf,i,nbytes);
memset(buf,0,sizeof buf);
}
if(serverclientflag == 1 ){
//Send the updated data to all the clients
for(j=0;j<=fdmax;j++){
if(FD_ISSET(j,&master)){
//need not send the data to listener && this machine
if(j!=listener && j!=i){
if(send(j,opbuff,sizeof opbuff,0)== -1){
//perror("Sending the list data");
}
}
}
}
}
//Send the updated data to all the clients
fflush(stdout);
printf("\n[PA1]$:");
fflush(stdout);
}
}
}
}
} //end of the readset polling loop
} //end of the running loop
return 0 ;
}