int sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size);
int receivePacket(int sock, PPPoEPacket *pkt, int *size);
void fatalSys(char const *str);
-void rp_fatal(char const *str);
-void printErr(char const *str);
-void sysErr(char const *str);
void dumpPacket(FILE *fp, PPPoEPacket *packet, char const *dir);
void dumpHex(FILE *fp, unsigned char const *buf, int len);
int parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra);