ImportError: symbol not found in flat namespace '_ndpi_category_get_name'

[Guygolpur]

I am getting this error on MacOS with Python 3.9.6

_ImportError: symbol not found in flat namespace 'ndpi_category_get_name'

The steps I made:

1. I downloaded the facebook.pcap from nfstream/tests/pcaps/ path from your repo
2. I copied this code from your documentation:

from nfstream import NFStreamer

my_streamer = NFStreamer(source="facebook.pcap", # or live network interface
                         decode_tunnels=True,
                         bpf_filter=None,
                         promiscuous_mode=True,
                         snapshot_length=1536,
                         idle_timeout=120,
                         active_timeout=1800,
                         accounting_mode=0,
                         udps=None,
                         n_dissections=20,
                         statistical_analysis=False,
                         splt_analysis=0,
                         n_meters=0,
                         max_nflows=0,
                         performance_report=0,
                         system_visibility_mode=0,
                         system_visibility_poll_ms=100)
                         
for flow in my_streamer:
    print(flow)  # print it.

Desktop:

• OS: macOS
• Python version: 3.9.6
• NFStream version: 6.5.3

[hos-arafat]

I have the same OS, Python and NFStream versions and I had the same error.

I fixed it by doing the following:

1. Uninstalling nfstream using pip:

pip uninstall nfstream

2. Building nfstream from source by following the instructions in the NFStream docs here:

Install the MacOS prerequisites:

brew install autoconf automake libtool pkg-config gettext json-c

Build NFStream from source:

git clone --recurse-submodules https://github.com/nfstream/nfstream.git
cd nfstream
python3 -m pip install --upgrade pip
python3 -m pip install -r dev_requirements.txt
python3 -m pip install .

I actually noticed that when the git clone --recurse-submodules https://github.com/nfstream/nfstream.git command runs, it clones into /nfstream/nfstream/engine/dependencies/nDPI. So I think building from source causes nDPI (the most likely source of the error) to build correctly.