ipv4_reassembly

[mkrase]

Describe the bug
I' reading packets with dpkt like this:

import dpkt
import pcapkit
from pcapkit.reassembly import IPv4_Reassembly
ipv4_reassembly = IPv4_Reassembly()
f = open(r'test.pcapng','rb')
pcap = dpkt.pcapng.Reader(f)
buffer = []
for timestamp, buf in pcap:
    eth = dpkt.ethernet.Ethernet(buf)
    if isinstance(eth.data, dpkt.ip.IP):
        ip = eth.data
        if ip.p == dpkt.ip.IP_PROTO_UDP:
            udp = ip.data
            frag, defrag = pcapkit.toolkit.dpkt.ipv4_reassembly(eth)
            if frag:
                buffer = ipv4_reassembly(defrag)    

System information

• OS Version: [Windows 10]
• Python Version: [3.8,7]
• Python Implementation: [CPython]

Traceback stack
Run program again with PCAPKIT_DEVMODE=true set to provide the traceback stack.

pcapkit.utilities.exceptions.IntError: Function call expected integral number, NotImplementedType got instead.
During handling of the above exception, another exception occurred:
pcapkit.utilities.exceptions.FragmentError: 'Malformed fragment object: Function call expected integral number, NotImplementedType got instead.'

With

buffer = []
for timestamp, buf in pcap:
    eth = dpkt.ethernet.Ethernet(buf)
    if isinstance(eth.data, dpkt.ip.IP):
        ip = eth.data
        if ip.p == dpkt.ip.IP_PROTO_UDP:
            udp = ip.data
            frag, defrag = pcapkit.toolkit.dpkt.ipv4_reassembly(eth)
            if frag:
                defrag['num'] = 0
                buffer = ipv4_reassembly(defrag)      

I got:
Traceback (most recent call last):
File "C:\Program Files\Python38\lib\code.py", line 90, in runcode
exec(code, self.locals)
File "", line 10, in
UnboundLocalError: local variable 'TDL' referenced before assignment

Expected behavior
Defragmented packet(s).

[mkrase]

Okay, I think I just have know how I fill the dict for ipv4_reassembly...

[JarryShaw]

FYI, you may check out pcapkit.toolkit.dpkt to see about the utility functions that may help you generate a valid dict for reassembly.