#include "main.h"
//======================================================================
//						MAIN
//======================================================================
int main(int argc, char **argv)
{
	int portNumber;
	struct sockaddr_in myAddr;
	char msg[0x100];
	struct sockaddr_in fromAddr;
	int ok;
	
	//---- check command line arguments ----
	if(argc!=2)
									{ fprintf(stderr,"usage: %s port\n",argv[0]); exit(1); }

	//---- extract local port number ----
	if(sscanf(argv[1],"%d",&portNumber)!=1)
									{ fprintf(stderr,"invalid port %s\n",argv[1]); exit(1); }

	//---- create UDP socket ----
	int udpSocket=socket(PF_INET,SOCK_DGRAM,0);
	if(udpSocket==-1)
									{ perror("socket"); exit(1); }
	// ... bound to any local address on the specified port
	myAddr.sin_family=AF_INET;
	myAddr.sin_port=htons(portNumber);
	myAddr.sin_addr.s_addr=htonl(INADDR_ANY);
	ok = bind(udpSocket,(struct sockaddr *)&myAddr,sizeof(myAddr));
									if (ok== -1){ perror("bind"); exit(1); }
	// ... allowing broadcast (optional)
	int on=1;
	ok = setsockopt(udpSocket,SOL_SOCKET,SO_BROADCAST,&on,sizeof(int));
									if (ok== -1){ perror("setsockopt"); exit(1); }

	for(;;)
	  {
		  //---- receive message ----
		  socklen_t len=sizeof(fromAddr);
		  int r=recvfrom(udpSocket,msg,0x100,0,(struct sockaddr *)&fromAddr,&len);
		  if(r==-1)
										{ perror("recvfrom"); exit(1); }

		  //---- display message and source address/port ----
		  msg[r]='\0';
		  printf("from %s:%d : %s\n", inet_ntoa(fromAddr.sin_addr),ntohs(fromAddr.sin_port),msg);
	  }

	close(udpSocket);
return 0;
}
//^^^^^^^^^^^^^^^^^^^^^^^^^^ EOF ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^