Fix *BSD bpf detection

[gpotter2]

fixes #1793

[codecov]

Codecov Report

Merging #1794 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1794      +/-   ##
==========================================
- Coverage   85.59%   85.58%   -0.01%     
==========================================
  Files         181      181              
  Lines       42216    42216              
==========================================
- Hits        36135    36131       -4     
- Misses       6081     6085       +4

Impacted Files	Coverage Δ
scapy/config.py	84.58% <100%> (ø)	⬆️
scapy/layers/tls/keyexchange.py	83.26% <0%> (-1.31%)	⬇️
scapy/automaton.py	81.84% <0%> (-0.56%)	⬇️
scapy/layers/inet6.py	88.11% <0%> (-0.12%)	⬇️
scapy/sendrecv.py	82.95% <0%> (+0.17%)	⬆️
scapy/fields.py	91.76% <0%> (+0.36%)	⬆️
scapy/layers/ntp.py	92.04% <0%> (+0.53%)	⬆️

[guedou]

I tested it on FreeBSD12 and it works fine, except for one test in test/pipetool.uts.

[guedou]

I will submit a PR.

[gpotter2]

Yes the last on fails on HTTP 1.1 rather than HTTP 1.0
Had the same issue when trying out #1660 but I don’t think that’s the root the issue. Otherwise the tests passed :/

[guedou]

I will push a fix soon.