Hi,
I have aligned my Python demos** of the BRSKI discovery mechanisms with the -12
draft.
Here are dumps of the received flood messages, with discussion:
(1) Flood sent by the registrar as received by the proxy. This is Python output
(so the b'...' strings are hexdumps of bytes objects.)
[9, 1729214102, b'2406e00741ec000128ccdc4c97036781', 120000,
[['AN_join_registrar', 5, 255, 'EST-TLS'], [103,
b'2406e00741ec000128ccdc4c97036781', 6, 80]]]
Nothing serious to report here. Since the draft only defines the 'EST-TLS'
form, I haven't included any alternatives. My code could also handle announcing
IP-in-IP for example.
Compare to the example in the draft:
[M_FLOOD, 12340815, h'fda379a6f6ee00000200000064000001', 180000,
["AN_join_registrar", 4, 255, "EST-TLS"],
[O_IPv6_LOCATOR,
h'fda379a6f6ee00000200000064000001', TCP, 80]]
I'd prefer to see TCP represented as IPPROTO_TCP to align with the GRASP spec.
The other differences are unimportant (my network has global IPv6 addresses
instead of ULAs, I set the 'discoverable' flag bit, and I used a different
timeout).
(2) Flood sent by the proxy as received by the pledge, also Python output.
[9, 160559994, b'2406e00741ec000128ccdc4c97036781', 180000, [['AN_proxy', 5, 1,
''], [103, b'fe8000000000000028ccdc4c97036781', 6, 11805]]]
Compare to the example in the draft:
[M_FLOOD, 12340815, h'fe800000000000000000000000000001', 180000,
["AN_Proxy", 4, 1, ""],
[O_IPv6_LOCATOR,
h'fe800000000000000000000000000001', 'TCP', 4443]]
Several comments:
1. The 3rd element is the 'initiator' address. The draft shows that as
a link-local. It doesn't matter too much, but my code uses a routeable
address. It's only there for disambiguation in a multi-hop flood,
which doesn't apply in this case. The address that matters is the second
one, in the locator. The packet itself is sent link-local.
2. 'TCP' shouldn't be a string, it should be IPPROTO_TCP as above.
3. The objective is defined as having a null value. Why isn't it
"EST-TLS" again?
** Code at https://github.com/becarpenter/graspy (Reggie.py, Procksy.py,
Pledji.py)
Regards
Brian
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