How to automatically derive automatically with C ++ in BNF

BNF paradigm

Attack :: = attack_name {Signatures

Match

Description}

Attack_name :: =

Signatures :: = Signature Signatures | ε

Signature :: = IP_SIGNATURE | DIR | GET_SIGNATURE |

OPT_SIGATURE | Exp_Signature | Proto | ε

Proto :: = TCP | IP | ICMP | UDP

IP_SIGNATURE :: = (SIP | DIP) ip_addr [/ mask] | ε

IP_ADDR :: = . "Integer>. "Integer>. / / large number of large than 0 less than 255

Mask :: = / / large than 1 less than 32

Opt_sigature :: = OPT: OPTS | ε

OPTS :: = (OPT |! OPT) OPTS | ε

Opt :: = CWR | ECN | URG | ACK | PUSH | RESET | SYN | FIN | ε

Dir :: = S2D | D2S | ε

Exp_signature :: = Exp_name: EXPS | ε

Exp_name :: = SPORT | DPORT | UDPLEN | TCPLEN | IPLEN |

TCPSEQUENCE | ε

EXPS :: = Exp exps | z

EXP :: = :

Exp :: = exp (or | and) exp

Exp :: =! EXP

GET_SIGNATURE :: = matchget

Match :: = SUBSTR MATCH | Z

Substr :: = SUBSTR (matching string, matching start point, matching end point, matching mode)

Matching mode :: = NOCASE | Anamorphosis

Description :: = Alarm Confidence Severity CVE

Alarm :: = @ alarm = Attack code, attack type

Confidence :: =! Confidence =

Severity :: =! Severity =

CVE :: =