Scapy blocks on parsing BGP pcap

Brief description

Scapy hangs after rdpcap('bgp.pcap'), please download the pcap via link

Scapy version

2.4.5rc1.dev89

Python version

3.8.10

Operating system

Linux 5.8.0-50-generic

Additional environment information

No response

How to reproduce

prepare the pcap file: curl -OL https://gist.github.com/jschwinger23/8a4cf4b13047b8b6086576413f1a60d5/raw/c51ac8e316c34b3b210f2e4965e4fa12c1ca7e78/bgp.pcap
run scapy
type load_contrib('bgp') and p = rdpcap('bgp.pcap'), then it runs forever.

Actual result

If I press Ctrl-C to interrupt, the stack frames are

>>> load_contrib('bgp')
WARNING: [bgp.py] use_2_bytes_asn: True
>>> p = rdpcap('bgp.pcap')
^C---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
<ipython-input-2-3f100d0bd1c5> in <module>
----> 1 p = rdpcap('bgp.pcap')

~/.local/lib/python3.8/site-packages/scapy/utils.py in rdpcap(filename, count)
   1115     # layout that will actually be supported and properly dissected.
   1116     with PcapReader(filename) as fdesc:  # type: ignore
-> 1117         return fdesc.read_all(count=count)
   1118 
   1119 

~/.local/lib/python3.8/site-packages/scapy/utils.py in read_all(self, count)
   1383     def read_all(self, count=-1):
   1384         # type: (int) -> PacketList
-> 1385         res = self._read_all(count)
   1386         from scapy import plist
   1387         return plist.PacketList(res, name=os.path.basename(self.filename))

~/.local/lib/python3.8/site-packages/scapy/utils.py in _read_all(self, count)
   1293             count -= 1
   1294             try:
-> 1295                 p = self.read_packet()  # type: Packet
   1296             except EOFError:
   1297                 break

~/.local/lib/python3.8/site-packages/scapy/utils.py in read_packet(self, size)
   1629         try:
   1630             cls = conf.l2types.num2layer[linktype]  # type: Type[Packet]
-> 1631             p = cls(s)  # type: Packet
   1632         except KeyboardInterrupt:
   1633             raise

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    157         self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
    158         if _pkt:
--> 159             self.dissect(_pkt)
    160             if not _internal:
    161                 self.dissection_done(self)

~/.local/lib/python3.8/site-packages/scapy/packet.py in dissect(self, s)
    997 
    998         payl, pad = self.extract_padding(s)
--> 999         self.do_dissect_payload(payl)
   1000         if pad and conf.padding:
   1001             self.add_payload(conf.padding_layer(pad))

~/.local/lib/python3.8/site-packages/scapy/packet.py in do_dissect_payload(self, s)
    972             cls = self.guess_payload_class(s)
    973             try:
--> 974                 p = cls(s, _internal=1, _underlayer=self)
    975             except KeyboardInterrupt:
    976                 raise

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    157         self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
    158         if _pkt:
--> 159             self.dissect(_pkt)
    160             if not _internal:
    161                 self.dissection_done(self)

~/.local/lib/python3.8/site-packages/scapy/packet.py in dissect(self, s)
    997 
    998         payl, pad = self.extract_padding(s)
--> 999         self.do_dissect_payload(payl)
   1000         if pad and conf.padding:
   1001             self.add_payload(conf.padding_layer(pad))

~/.local/lib/python3.8/site-packages/scapy/packet.py in do_dissect_payload(self, s)
    972             cls = self.guess_payload_class(s)
    973             try:
--> 974                 p = cls(s, _internal=1, _underlayer=self)
    975             except KeyboardInterrupt:
    976                 raise

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    157         self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
    158         if _pkt:
--> 159             self.dissect(_pkt)
    160             if not _internal:
    161                 self.dissection_done(self)

~/.local/lib/python3.8/site-packages/scapy/packet.py in dissect(self, s)
    997 
    998         payl, pad = self.extract_padding(s)
--> 999         self.do_dissect_payload(payl)
   1000         if pad and conf.padding:
   1001             self.add_payload(conf.padding_layer(pad))

~/.local/lib/python3.8/site-packages/scapy/packet.py in do_dissect_payload(self, s)
    972             cls = self.guess_payload_class(s)
    973             try:
--> 974                 p = cls(s, _internal=1, _underlayer=self)
    975             except KeyboardInterrupt:
    976                 raise

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    157         self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
    158         if _pkt:
--> 159             self.dissect(_pkt)
    160             if not _internal:
    161                 self.dissection_done(self)

~/.local/lib/python3.8/site-packages/scapy/packet.py in dissect(self, s)
    997 
    998         payl, pad = self.extract_padding(s)
--> 999         self.do_dissect_payload(payl)
   1000         if pad and conf.padding:
   1001             self.add_payload(conf.padding_layer(pad))

~/.local/lib/python3.8/site-packages/scapy/packet.py in do_dissect_payload(self, s)
    972             cls = self.guess_payload_class(s)
    973             try:
--> 974                 p = cls(s, _internal=1, _underlayer=self)
    975             except KeyboardInterrupt:
    976                 raise

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    157         self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
    158         if _pkt:
--> 159             self.dissect(_pkt)
    160             if not _internal:
    161                 self.dissection_done(self)

~/.local/lib/python3.8/site-packages/scapy/packet.py in dissect(self, s)
    992         s = self.pre_dissect(s)
    993 
--> 994         s = self.do_dissect(s)
    995 
    996         s = self.post_dissect(s)

~/.local/lib/python3.8/site-packages/scapy/packet.py in do_dissect(self, s)
    949             if not s:
    950                 break
--> 951             s, fval = f.getfield(self, s)
    952             # Skip unused ConditionalField
    953             if isinstance(f, ConditionalField) and fval is None:

~/.local/lib/python3.8/site-packages/scapy/fields.py in getfield(self, pkt, s)
   1417                  ):
   1418         # type: (...) -> Tuple[bytes, K]
-> 1419         i = self.m2i(pkt, s)
   1420         remain = b""
   1421         if conf.padding_layer in i:

~/.local/lib/python3.8/site-packages/scapy/fields.py in m2i(self, pkt, m)
   1410     def m2i(self, pkt, m):
   1411         # type: (Optional[Packet], bytes) -> Packet
-> 1412         return self.cls(m)
   1413 
   1414     def getfield(self,

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    157         self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
    158         if _pkt:
--> 159             self.dissect(_pkt)
    160             if not _internal:
    161                 self.dissection_done(self)

~/.local/lib/python3.8/site-packages/scapy/packet.py in dissect(self, s)
    992         s = self.pre_dissect(s)
    993 
--> 994         s = self.do_dissect(s)
    995 
    996         s = self.post_dissect(s)

~/.local/lib/python3.8/site-packages/scapy/packet.py in do_dissect(self, s)
    949             if not s:
    950                 break
--> 951             s, fval = f.getfield(self, s)
    952             # Skip unused ConditionalField
    953             if isinstance(f, ConditionalField) and fval is None:

~/.local/lib/python3.8/site-packages/scapy/contrib/bgp.py in getfield(self, pkt, s)
   2463             current = remain[:orf_len]
   2464             remain = remain[orf_len:]
-> 2465             packet = self.m2i(pkt, current)
   2466             lst.append(packet)
   2467 

~/.local/lib/python3.8/site-packages/scapy/contrib/bgp.py in m2i(self, pkt, m)
   2406 
   2407         else:
-> 2408             ret = conf.raw_layer(m)
   2409 
   2410         return ret

~/.local/lib/python3.8/site-packages/scapy/base_classes.py in __call__(cls, *args, **kargs)
    387             cls.__dict__
    388         )
--> 389         i.__init__(*args, **kargs)
    390         return i  # type: ignore
    391 

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, *args, **kwargs)
   1923         if _pkt and not isinstance(_pkt, bytes):
   1924             _pkt = bytes_encode(_pkt)
-> 1925         super(Raw, self).__init__(_pkt, *args, **kwargs)
   1926 
   1927     def answers(self, other):

~/.local/lib/python3.8/site-packages/scapy/packet.py in __init__(self, _pkt, post_transform, _internal, _underlayer, **fields)
    146         self.fieldtype = {}  # type: Dict[str, AnyField]
    147         self.packetfields = []  # type: List[AnyField]
--> 148         self.payload = NoPayload()
    149         self.init_fields()
    150         self.underlayer = _underlayer

~/.local/lib/python3.8/site-packages/scapy/packet.py in __setattr__(self, attr, val)
    459             if attr == "sent_time":
    460                 self.update_sent_time(val)
--> 461             return object.__setattr__(self, attr, val)
    462         try:
    463             return self.setfieldval(attr, val)

KeyboardInterrupt: 
>>>

Expected result

The pcap actually can be parsed by tshark, and here's the result:

$ tshark -r bgp.pcap -V
Frame 1: 361 bytes on wire (2888 bits), 361 bytes captured (2888 bits) on interface unknown, id 0
    Interface id: 0 (unknown)
        Interface name: unknown
    Encapsulation type: Ethernet (1)
    Arrival Time: Aug 22, 2021 18:55:17.463930000 +08
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1629629717.463930000 seconds
    [Time delta from previous captured frame: 0.000000000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 0.000000000 seconds]
    Frame Number: 1
    Frame Length: 361 bytes (2888 bits)
    Capture Length: 361 bytes (2888 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:bgp]
Ethernet II, Src: HuaweiTe_8b:cf:90 (f8:6e:ee:8b:cf:90), Dst: HuaweiTe_d9:8d:4c (cc:bb:fe:d9:8d:4c)
    Destination: HuaweiTe_d9:8d:4c (cc:bb:fe:d9:8d:4c)
        Address: HuaweiTe_d9:8d:4c (cc:bb:fe:d9:8d:4c)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: HuaweiTe_8b:cf:90 (f8:6e:ee:8b:cf:90)
        Address: HuaweiTe_8b:cf:90 (f8:6e:ee:8b:cf:90)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 10.22.12.88, Dst: 10.22.12.44
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0xc0 (DSCP: CS6, ECN: Not-ECT)
        1100 00.. = Differentiated Services Codepoint: Class Selector 6 (48)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    Total Length: 347
    Identification: 0x6688 (26248)
    Flags: 0x4000, Don't fragment
        0... .... .... .... = Reserved bit: Not set
        .1.. .... .... .... = Don't fragment: Set
        ..0. .... .... .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0xa5a5 [validation disabled]
    [Header checksum status: Unverified]
    Source: 10.22.12.88
    Destination: 10.22.12.44
Transmission Control Protocol, Src Port: 47689, Dst Port: 179, Seq: 1, Ack: 1, Len: 307
    Source Port: 47689
    Destination Port: 179
    [Stream index: 0]
    [TCP Segment Len: 307]
    Sequence number: 1    (relative sequence number)
    Sequence number (raw): 2001537567
    [Next sequence number: 308    (relative sequence number)]
    Acknowledgment number: 1    (relative ack number)
    Acknowledgment number (raw): 438819095
    0101 .... = Header Length: 20 bytes (5)
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 237
    [Calculated window size: 237]
    [Window size scaling factor: -1 (unknown)]
    Checksum: 0xd946 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    [SEQ/ACK analysis]
        [Bytes in flight: 307]
        [Bytes sent since last PSH flag: 307]
    [Timestamps]
        [Time since first frame in this TCP stream: 0.000000000 seconds]
        [Time since previous frame in this TCP stream: 0.000000000 seconds]
    TCP payload (307 bytes)
Border Gateway Protocol - ROUTE-REFRESH Message
    Marker: ffffffffffffffffffffffffffffffff
    Length: 23
    Type: ROUTE-REFRESH Message (5)
    Address family identifier (AFI): IPv4 (1)
    Subtype: Demarcation of the beginning of a route refresh (1)
    Subsequent address family identifier (SAFI): Unicast (1)
Border Gateway Protocol - UPDATE Message
    Marker: ffffffffffffffffffffffffffffffff
    Length: 208
    Type: UPDATE Message (2)
    Withdrawn Routes Length: 185
    Withdrawn Routes
        0.0.0.0/0 PathId 2 
            NLRI path id: 2
            Prefix Length: 0
            Withdrawn prefix: 0.0.0.0
        10.233.25.178/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.178
        10.233.25.144/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.144
        10.233.25.147/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.147
        10.233.25.187/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.187
        10.233.25.159/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.159
        10.233.25.140/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.140
        10.233.25.177/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.177
        10.233.25.143/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.143
        10.233.25.152/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.152
        10.233.25.155/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.155
        10.233.25.139/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.139
        10.233.25.179/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.179
        10.233.25.145/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.145
        10.233.25.182/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.182
        10.233.25.148/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.148
        10.233.25.151/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.151
        10.233.25.188/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.188
        10.233.25.157/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.157
        10.233.25.163/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.163
        10.233.25.132/32 PathId 4 
            NLRI path id: 4
            Prefix Length: 32
            Withdrawn prefix: 10.233.25.132
    Total Path Attribute Length: 0
Border Gateway Protocol - UPDATE Message
    Marker: ffffffffffffffffffffffffffffffff
    Length: 53
    Type: UPDATE Message (2)
    Withdrawn Routes Length: 0
    Total Path Attribute Length: 21
    Path attributes
        Path Attribute - ORIGIN: IGP
            Flags: 0x40, Transitive, Well-known, Complete
                0... .... = Optional: Not set
                .1.. .... = Transitive: Set
                ..0. .... = Partial: Not set
                ...0 .... = Extended-Length: Not set
                .... 0000 = Unused: 0x0
            Type Code: ORIGIN (1)
            Length: 1
            Origin: IGP (0)
        Path Attribute - AS_PATH: empty
            Flags: 0x40, Transitive, Well-known, Complete
                0... .... = Optional: Not set
                .1.. .... = Transitive: Set
                ..0. .... = Partial: Not set
                ...0 .... = Extended-Length: Not set
                .... 0000 = Unused: 0x0
            Type Code: AS_PATH (2)
            Length: 0
        Path Attribute - NEXT_HOP: 10.22.12.88 
            Flags: 0x40, Transitive, Well-known, Complete
                0... .... = Optional: Not set
                .1.. .... = Transitive: Set
                ..0. .... = Partial: Not set
                ...0 .... = Extended-Length: Not set
                .... 0000 = Unused: 0x0
            Type Code: NEXT_HOP (3)
            Length: 4
            Next hop: 10.22.12.88
        Path Attribute - LOCAL_PREF: 100
            Flags: 0x40, Transitive, Well-known, Complete
                0... .... = Optional: Not set
                .1.. .... = Transitive: Set
                ..0. .... = Partial: Not set
                ...0 .... = Extended-Length: Not set
                .... 0000 = Unused: 0x0
            Type Code: LOCAL_PREF (5)
            Length: 4
            Local preference: 100
    Network Layer Reachability Information (NLRI)
        10.233.0.22/32 PathId 2 
            NLRI path id: 2
            Prefix Length: 32
            NLRI prefix: 10.233.0.22
Border Gateway Protocol - ROUTE-REFRESH Message
    Marker: ffffffffffffffffffffffffffffffff
    Length: 23
    Type: ROUTE-REFRESH Message (5)
    Address family identifier (AFI): IPv4 (1)
    Subtype: Demarcation of the ending of a route refresh (2)
    Subsequent address family identifier (SAFI): Unicast (1)

Related resources

I ran a profile for this, and here's part of the output:

$ cat scapy_bug.py 
load_contrib('bgp')
rdpcap('bgp.pcap')

 $  /usr/bin/python3 -mcProfile  -s calls /usr/local/bin/scapy -c scapy_bug.py
   Ordered by: call count

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
 43635869   12.852    0.000   13.095    0.000 packet.py:456(__setattr__)
 11899790    1.702    0.000    1.702    0.000 packet.py:333(get_field)
 11899650    0.934    0.000    0.934    0.000 fields.py:199(i2h)
 11899650    6.199    0.000   14.138    0.000 packet.py:425(__getattr__)
 11899650    5.304    0.000    7.006    0.000 packet.py:413(getfield_and_val)
  5954674    0.603    0.000    0.603    0.000 {method 'get' of 'dict' objects}
  4136270    0.783    0.000    0.783    0.000 {built-in method builtins.isinstance}
3966836/80   11.001    0.000   73.444    0.918 base_classes.py:370(__call__)
  2014650    0.224    0.000    0.224    0.000 {method 'append' of 'list' objects}
  1989295    0.476    0.000    0.480    0.000 {built-in method __new__ of type object at 0x908780}
  1987594    1.930    0.000    2.380    0.000 typing.py:868(__new__)
  1985987    0.322    0.000    0.322    0.000 {method 'pop' of 'dict' objects}
1984601/1984577    0.956    0.000    0.956    0.000 config.py:863(__getattribute__)
  1983748    0.425    0.000    0.425    0.000 {method 'get' of 'mappingproxy' objects}
  1983434    0.335    0.000    0.335    0.000 {built-in method time.time}
1983418/80   10.063    0.000   73.443    0.918 packet.py:129(__init__)
1983418/1983359    1.288    0.000    7.562    0.000 packet.py:224(init_fields)
  1983418    0.243    0.000    0.243    0.000 packet.py:1044(update_sent_time)
1983418/1983417    0.874    0.000    1.300    0.000 packet.py:1745(__new__)
  1983418    0.228    0.000    0.228    0.000 packet.py:1753(__init__)
1983416/1983357    3.676    0.000    6.016    0.000 packet.py:251(do_init_cached_fields)
  1983275    1.740    0.000   40.862    0.000 packet.py:1921(__init__)
  1983274    5.664    0.000   60.086    0.000 bgp.py:2390(m2i)
   118568    0.035    0.000    0.059    0.000 compat.py:299(plain_str)
   118473    0.017    0.000    0.017    0.000 {method 'decode' of 'bytes' objects}
    77084    0.008    0.000    0.008    0.000 {method 'strip' of 'bytes' objects}
46492/46078    0.004    0.000    0.004    0.000 {built-in method builtins.len}
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secdev / scapy

Scapy blocks on parsing BGP pcap #3345