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Fix syn (#102)

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* Add unit test for TCP SYN replies
* Add functional test for TCP SYN+flag packets
* Fix bug: prevent anwsers to SYN+flag first packets
* Fix TCP behaviour to match Linux network stack
* Update the documentation according to the new behaviour for TCP SYN packets
This commit is contained in:
_Frky 2023-07-05 22:20:06 +02:00 • committed by GitHub
parent 092a16631c
commit c132c39ebf
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3 changed files with 128 additions and 3 deletions
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24
test/src/tests/tcp.py
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@ -277,3 +277,27 @@ def test_ipv6_tcp_psh_ack():
assert TCP in ack, "expecting TCP, got %r" % ack.summary()
ack = ack[TCP]
assert ack.flags == "A", "expecting TCP A, got %r" % syn_ack.flags
@test
def test_tcp_syn_with_flags():
# send a SYN packet with other TCP flags, should not be answered
for flags in ["SA", "SR", "SF", "SPUCE"]:
seq_init = int(RandInt())
syn = (
Ether(dst=MAC_ADDR)
/ IP(dst=IPV4_ADDR)
/ TCP(flags=flags, dport=80, seq=seq_init)
)
syn_ack = srp1(syn, timeout=1)
assert syn_ack is None, "expecting no answer, got one"
# some should be accepted to imitate a Linux network stack
for flags in ["SP", "SU", "SC", "SE", "SPU", "SPC", "SPE", "SPUC", "SPUE"]:
seq_init = int(RandInt())
syn = (
Ether(dst=MAC_ADDR)
/ IP(dst=IPV4_ADDR)
/ TCP(flags=flags, dport=80, seq=seq_init)
)
syn_ack = srp1(syn, timeout=1)
assert syn_ack is not None, "expecting answer, got None"