#include struct _libnet { int packet_size; u_char *packet; char err_buf[LIBNET_ERRBUF_SIZE]; u_char *device; struct libnet_link_int *network; }; void prepare_libnet (struct _libnet *lnet); int play_arpg (struct _libnet *, u_char *, u_char *, u_char *, u_char *);