the project have send arp package and recv arp package functional, furthermore query machine ip ,mac, netmask,broadcast, other machine mac
the project arp builded on Ubuntu 12.04.2 and gcc 4.6.3
apr.h provide two interface function. one send broadcast arp reply package, the other query other host mac
hostintf.h provide some function that query interface infomation, aboute ip,mac,netmask,broadcast and so on.