#CMPS 128 - Homework 2
#Josep Valls - 4/24/2008
#jvallsva - 1139975
#Time server
import socket
import struct
import time,datetime
import sys
#Defaults, for testing purposes
pport=1235
#Parameters read from the given arguments
pport=int(sys.argv[1])
#Object initialization
dgramSock=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
dgramSock.bind(('',pport))
print 'Server started'
#Main program loop
while 1:
	#Read requests
	req,(addr,port)=dgramSock.recvfrom(4)
	req=struct.unpack('!I',req)
	if req[0]!=0x1234deed:
		print 'magic number error',"%#x" % req,'from',addr,port
	else:
		#Send response to client
		timetime=time.time()
		rsecs=int(timetime)
		rmsecs=int((timetime-rsecs)*1000000)
		print 'sending',rsecs,rmsecs,'to',addr,port
		dgramSock.sendto(struct.pack('!III',0xbeef5678,rsecs,rmsecs),(addr,port))
dgramSock.close()