This directory contains source code and data to test if the GFW will exempts a connection if more than 50% of all bytes in its first data packets are ASCII characters.
To generate payloads for testing and ask detect.py to predict if each probe will get blocked or not:
makeRun the experiment:
make testCompare the experiment results with what Algorithm 1 predicts:
make compare- If there is no output to stdout and stderr at all, it means all experiment results match what
detect.py(Algorithm 1) predicts. - If there is any difference, it does not necessarily mean the detection rule does not hold. It may suggest a testing failure due to unreliable network. Simply re-run
make testand thenmake compareagain, to see if the same payload still have inconsistent results.
This experiment tests sending 100 strings, ranging from 0 printable bytes to 100 printable bytes.
Strings are generated randomly (test-printable-frac.py):
for n=0 to 100, choose n printable bytes (0x20-0x7e)
and 100-n non-printable bytes (0x00-0x1f or 0x7f-0xff)
Shuffle those bytes, and send each payload (so the printable bytes are randomly distributed)
python3 test-printable-fraction/test-printable-frac.py | ./utils/affected-payload -host REDACTED_US_SERVER_IP -p 4000-5000 -worker 30 > ./test-printable-fraction/fraction.outpython3 ./test-printable-fraction/analyze.py < ./test-printable-fraction/fraction.out | sort -k 1 -n > ./test-printable-fraction/result.out