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The world is a mess. A single DNS request may yield multiple, subtly
different responses; all with the same DNS protocol-level ID.
Last response wins in terms of what ends up in the cache.
First response wins in terms of the response sent to the client. Hard
to do otherwise since we have no clue that more than one answer will
be forthcoming.
Type: fix
Ticket: VPP-1749
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I3175a40eb1fea237048d16b852a430f5ab51eaef
(cherry picked from commit e8d2dcb6a619f0884ece2284a286f21b3aa77e5a)
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Remove the (unused) node_registration_t, don't try to use it to signal
resolution events.
Type: fix
Ticket: VPP-1746
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: Ice975e32152892ac4100b9e758412d48a43f09f1
(cherry picked from commit 018c14b7dbc5a910693f150045bfa803c4ae4eec)
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Change-Id: Iab27b405fb3ca7aed94ae974d57c286c41298c3a
Signed-off-by: Dave Barach <dave@barachs.net>
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At least when testing against "known good" DNS servers: it turns out
that sending 2x requests - one for an A-record and another for a
AAAA-record - seems to work better than sending a single DNS_TYPE_ALL
request.
Fix c-string vs. u8 vector mistakes. Fix server failover.
Change-Id: I26554f0a9c1744376f21372506ebec8658e351e2
Signed-off-by: Dave Barach <dave@barachs.net>
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- separate client/server code for both memory and socket apis
- separate memory api code from generic vlib api code
- move unix_shared_memory_fifo to svm and rename to svm_fifo_t
- overall declutter
Change-Id: I90cdd98ff74d0787d58825b914b0f1eafcfa4dc2
Signed-off-by: Florin Coras <fcoras@cisco.com>
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Change-Id: I6eb0681cc2595f81ac3bf5ffa3e9b2adfff04a36
Signed-off-by: Dave Barach <dave@barachs.net>
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Change-Id: Ic531d820b1846ff7363e5c396ac0b1176e87b401
Signed-off-by: Dave Barach <dave@barachs.net>
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- Cache intermediate CNAME records
- Bug fixes
Change-Id: I06dcb558212fc5e9434281493c872577cf9b83e1
Signed-off-by: Dave Barach <dave@barachs.net>
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This patch is a plausible first-cut, suitable for initial testing by
vcl (host stack client library).
Main features;
- recursive name resolution
- multiple ip4/ip6 name servers
- cache size limit enforcement
- currently limited to 65K
- ttl / aging
- static mapping support
- show / clear / debug CLI commands
Binary APIs provided for the following:
- add/delete name servers
- enable/disable the name cache
- resolve a name
To Do list:
- Respond to ip4/ip6 client DNS requests (vs. binary API requests)
- Perf / scale tuning
- map pending transaction ids to pool indices, so the cache
can (greatly) exceed 65K entries
- Security improvements
- Use unpredictable dns transaction IDs, related to previous item
- Make sure that response-packet src ip addresses match the server
- Add binary APIs
- deliver raw response data to clients
- control recursive name resolution
- Documentation
Change-Id: I48c373d5c05d7108ccd814d4055caf8c75ca10b7
Signed-off-by: Dave Barach <dave@barachs.net>
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