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add fake reply generation for ICMP pings

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This commit is contained in:
Kevin Hester
2020-12-21 15:48:31 +08:00
parent 6bd455b7e3
commit e3cd669b44
1 changed files with 6 additions and 3 deletions
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9
tests/tuntest.py
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@@ -37,6 +37,11 @@ def readtest(tap):
if protocol == 0x02: # IGMP
ignore = True
logging.debug("Ignoring IGMP packet")
if protocol == 0x01: # ICMP
logging.warn("Generating fake ping reply")
# reply to pings (swap src and dest but keep rest of packet unchanged)
pingback = p[:12]+p[16:20]+p[12:16]+p[20:]
tap.write(pingback)
elif protocol == 0x11: # UDP
srcport = readnet_u16(p, subheader)
destport = readnet_u16(p, subheader + 2)
@@ -50,9 +55,7 @@ def readtest(tap):
if not ignore:
logging.debug(f"Forwarding packet bytes={hexstr(p)}")
# reply to pings
#pingback = p[:12]+p[16:20]+p[12:16]+p[20:]
#tap.write(pingback)
logging.basicConfig(level=logging.DEBUG)