def udp_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['U1']['TTL'], 16)
ip.flags = fp.probe['U1']['DF']
ip.len = 56
ip.id = 4162
icmp = ICMP()
icmp.type = 3
icmp.unused = 0
icmp.code = 13 # code 3 for reply
iperror = IPerror()
iperror.proto = 'udp'
iperror.ttl = 0x3E
iperror.len = fp.probe['U1']['RIPL']
iperror.id = fp.probe['U1']['RID']
ripck_val = fp.probe['U1']['RIPCK']
if ripck_val == 'G':
pass
elif ripck_val == 'Z':
iperror.chksum = 0
else:
iperror.chksum = pkt[IP].chksum
udperror = UDPerror()
udperror.sport = pkt[UDP].sport
udperror.dport = pkt[UDP].dport
udperror.len = pkt[UDP].len
if fp.probe['U1']['RUCK'] == 'G':
udperror.chksum = pkt[UDP].chksum
else:
udperror.chksum = fp.probe['U1']['RUCK']
try:
ipl = int(fp.probe['U1']['IPL'], 16)
except KeyError:
ipl = None
data = pkt[Raw].load
fin_pkt = ip / icmp / iperror / udperror / data if ether is None else ether / ip / icmp / iperror / udperror / data
return fin_pkt
def IP_layer(attributes):
layer3 = IP()
layer3.version = attributes['version']
layer3.ihl = attributes['ihl']
layer3.tos = attributes['tos']
layer3.len = attributes['len']
layer3.id = attributes['id']
layer3.flags = attributes['flags']
layer3.frag = attributes['frag']
layer3.ttl = attributes['ttl']
layer3.proto = attributes['proto']
layer3.src = attributes['src']
layer3.dst = attributes['dst']
return layer3
ip_source[index] = ""
for i in ip_src:
if i.isdigit():
ip_source[index] = str(ip_source[index]) + str(i)
else:
index += 1
ip_source[index] = ""
print(ip_source)
print(ip_dest)
ip_header.version = 4
ip_header.ihl = ip_hdr_len // 4
ip_header.tos = 0x0
ip_header.len = (ip_hdr_len + udp_pkt_len)
ip_header.id = 0
ip_header.flags = 0
ip_header.frag = 0
ip_header.ttl = 64
ip_header.proto = 17
#ip_header.chksum= 0x7ce6
ip_header.src = ip_src
ip_header.dst = ip_dst
del ip_header.chksum
ip_header = ip_header.__class__(str(ip_header))
#ip_header.show2()
#print("-------------------------------------")
#hexdump((ip_header.version << 4) | ip_header.ihl)
#print(ip_header.version << 4)
