def seqgen_pkt_craft(pkt, fp, mac, pno): try: ether = Ether() ether.src = mac ether.dst = pkt[Ether].dst ether.type = 0x800 except IndexError: ether = None ip = IP() ip.src = pkt[IP].dst ip.dst = pkt[IP].src ip.ttl = int(fp.probe['T1']['TTL'], 16) ip.flags = fp.probe['T1']['DF'] ip.id = fp.ip_id_gen() tcp = TCP() s_val = fp.probe['T1']['S'] if s_val == 'Z': tcp.seq = 0 elif s_val == 'A': tcp.seq = pkt[TCP].ack elif s_val == 'A+': tcp.seq = pkt[TCP].ack + 1 else: tcp.seq = fp.tcp_seq_gen() a_val = fp.probe['T1']['A'] if a_val == 'Z': tcp.ack = 0 elif a_val == 'S': tcp.ack = pkt[TCP].seq elif a_val == 'S+': tcp.ack = pkt[TCP].seq + 1 else: tcp.ack = pkt[TCP].seq + 369 flag_val = fp.probe['T1']['F'] tcp.flags = flag_val tcp.window = fp.probe['WIN']['W' + pno] tcp.sport = pkt[TCP].dport tcp.dport = pkt[TCP].sport tcp.options = fp.probe['OPS']['O' + pno] rd_val = fp.probe['T1']['RD'] if rd_val != '0': crc = int(rd_val, 16) data = b'TCP Port is closed\x00' data += compensate(data, crc) fin_pkt = ip / tcp / data if ether is None else ether / ip / tcp / data else: fin_pkt = ip / tcp if ether is None else ether / ip / tcp return fin_pkt
def ecn_craft(pkt, mac, fp): try: ether = Ether() ether.src = mac ether.dst = pkt[Ether].dst ether.type = 0x800 except IndexError: ether = None ip = IP() ip.src = pkt[IP].dst ip.dst = pkt[IP].src ip.ttl = int(fp.probe['ECN']['TTL'], 16) ip_flag = fp.probe['ECN']['DF'] if ip_flag == 'Y': ip.flags = 2 else: ip.flags = 0 ip.id = fp.ip_id_gen() tcp = TCP() w_val = fp.probe['ECN']['W'] if w_val == 'ECHOED': tcp.window = pkt[TCP].window else: tcp.window = w_val tcp.sport = pkt[TCP].dport tcp.dport = pkt[TCP].sport cc_val = fp.probe['ECN']['CC'] if cc_val == 'Y': tcp.flags = 0x52 elif cc_val == 'N': tcp.flags = 0x12 elif cc_val == 'S': tcp.flags = 0xD2 else: tcp.flags = 0x10 o_val = fp.probe['ECN']['O'] if o_val == 'EMPTY': pass else: tcp.options = o_val fin_pkt = ip / tcp if ether is None else ether / ip / tcp return fin_pkt
def t2tot7_craft(pkt, fp, mac, tno): try: ether = Ether() ether.src = mac ether.dst = pkt[Ether].dst ether.type = 0x800 except IndexError: ether = None ip = IP() ip.src = pkt[IP].dst ip.dst = pkt[IP].src ip.ttl = int(fp.probe[tno]['TTL'], 16) ip.flags = fp.probe[tno]['DF'] ip.id = random.randint(1, 1000) tcp = TCP() s_val = fp.probe[tno]['S'] if s_val == 'Z': tcp.seq = 0 elif s_val == 'A': tcp.seq = pkt[TCP].ack elif s_val == 'A+': tcp.seq = pkt[TCP].ack + 1 else: tcp.seq = pkt[TCP].ack + 369 a_val = fp.probe[tno]['A'] if a_val == 'Z': tcp.ack = 0 elif a_val == 'S': tcp.ack = pkt[TCP].seq elif a_val == 'S+': tcp.ack = pkt[TCP].seq + 1 else: tcp.ack = pkt[TCP].seq + 369 flag_val = fp.probe[tno]['F'] tcp.flags = flag_val w_val = fp.probe[tno]['W'] if w_val == 'ECHOED': tcp.window = pkt[TCP].window else: tcp.window = w_val tcp.sport = pkt[TCP].dport tcp.dport = pkt[TCP].sport o_val = fp.probe[tno]['O'] if o_val == 'EMPTY': pass else: tcp.options = o_val rd_val = fp.probe[tno]['RD'] if rd_val != '0': crc = int(rd_val, 16) data = b'TCP Port is closed\x00' data += compensate(data, crc) fin_pkt = ip / tcp / data if ether is None else ether / ip / tcp / data else: fin_pkt = ip / tcp if ether is None else ether / ip / tcp return fin_pkt