(DNSStrField("rdata", "", length_from=lambda pkt: pkt.rdlen),
lambda pkt: pkt.type in [2, 3, 4, 5, 12]),
# TEXT
(DNSTextField("rdata", [], length_from=lambda pkt: pkt.rdlen),
lambda pkt: pkt.type == 16),
],
StrLenField("rdata", "", length_from=lambda pkt: pkt.rdlen))
]
bind_layers(UDP, DNS, dport=5353)
bind_layers(UDP, DNS, sport=5353)
bind_layers(UDP, DNS, dport=53)
bind_layers(UDP, DNS, sport=53)
DestIPField.bind_addr(UDP, "224.0.0.251", dport=5353)
DestIP6Field.bind_addr(UDP, "ff02::fb", dport=5353)
bind_layers(TCP, DNS, dport=53)
bind_layers(TCP, DNS, sport=53)
@conf.commands.register
def dyndns_add(nameserver, name, rdata, type="A", ttl=10):
"""Send a DNS add message to a nameserver for "name" to have a new "rdata"
dyndns_add(nameserver, name, rdata, type="A", ttl=10) -> result code (0=ok)
example: dyndns_add("ns1.toto.com", "dyn.toto.com", "127.0.0.1")
RFC2136
"""
zone = name[name.find(".") + 1:]
r = sr1(
IP(dst=nameserver) / UDP() / DNS(
def guess_payload_class(self, payload):
if self.underlayer.len > 28:
return HSRPmd5
else:
return Packet.guess_payload_class(self, payload)
class HSRPmd5(Packet):
name = "HSRP MD5 Authentication"
fields_desc = [
ByteEnumField("type", 4, {4: "MD5 authentication"}),
ByteField("len", None),
ByteEnumField("algo", 0, {1: "MD5"}),
ByteField("padding", 0x00),
XShortField("flags", 0x00),
IPField("sourceip", None),
XIntField("keyid", 0x00),
StrFixedLenField("authdigest", "\00" * 16, 16)]
def post_build(self, p, pay):
if self.len is None and pay:
l = len(pay)
p = p[:1] + hex(l)[30:] + p[30:]
return p
bind_layers(UDP, HSRP, dport=1985, sport=1985)
bind_layers(UDP, HSRP, dport=2029, sport=2029)
DestIPField.bind_addr(UDP, "224.0.0.2", dport=1985)
DestIP6Field.bind_addr(UDP, "ff02::66", dport=2029)
name = "DNS Resource Record"
show_indent=0
fields_desc = [ DNSStrField("rrname",""),
ShortEnumField("type", 1, dnstypes),
ShortEnumField("rclass", 1, dnsclasses),
IntField("ttl", 0),
RDLenField("rdlen"),
RDataField("rdata", "", length_from=lambda pkt:pkt.rdlen) ]
bind_layers(UDP, DNS, dport=5353)
bind_layers(UDP, DNS, sport=5353)
bind_layers(UDP, DNS, dport=53)
bind_layers(UDP, DNS, sport=53)
DestIPField.bind_addr(UDP, "224.0.0.251", dport=5353)
DestIP6Field.bind_addr(UDP, "ff02::fb", dport=5353)
bind_layers(TCP, DNS, dport=53)
bind_layers(TCP, DNS, sport=53)
@conf.commands.register
def dyndns_add(nameserver, name, rdata, type="A", ttl=10):
"""Send a DNS add message to a nameserver for "name" to have a new "rdata"
dyndns_add(nameserver, name, rdata, type="A", ttl=10) -> result code (0=ok)
example: dyndns_add("ns1.toto.com", "dyn.toto.com", "127.0.0.1")
RFC2136
"""
zone = name[name.find(".")+1:]
r=sr1(IP(dst=nameserver)/UDP()/DNS(opcode=5,
qd=[DNSQR(qname=zone, qtype="SOA")],
def guess_payload_class(self, payload):
if self.underlayer.len > 28:
return HSRPmd5
else:
return Packet.guess_payload_class(self, payload)
class HSRPmd5(Packet):
name = "HSRP MD5 Authentication"
fields_desc = [
ByteEnumField("type", 4, {4: "MD5 authentication"}),
ByteField("len", None),
ByteEnumField("algo", 0, {1: "MD5"}),
ByteField("padding", 0x00),
XShortField("flags", 0x00),
SourceIPField("sourceip", None),
XIntField("keyid", 0x00),
StrFixedLenField("authdigest", b"\00" * 16, 16)]
def post_build(self, p, pay):
if self.len is None and pay:
l = len(pay)
p = p[:1] + hex(l)[30:] + p[30:]
return p
bind_layers(UDP, HSRP, dport=1985, sport=1985)
bind_layers(UDP, HSRP, dport=2029, sport=2029)
DestIPField.bind_addr(UDP, "224.0.0.2", dport=1985)
DestIP6Field.bind_addr(UDP, "ff02::66", dport=2029)
