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ntp: add server support for KoD RATE

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Add "kod" option to the ratelimit directive to respond with the KoD
RATE code to randomly selected requests exceeding the configured limit.
This complements the client support of KoD RATE. It's disabled by
default.

There can be only one KoD code in one response. If both NTS NAK and RATE
codes are triggered, drop the response. The KoD RATE code can be set in
an NTS-authenticated response.
This commit is contained in:
Miroslav Lichvar
2024-04-02 15:25:51 +02:00
parent aac898343e
commit 24d28cd679
6 changed files with 41 additions and 11 deletions
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11
test/simulation/135-ratelimit
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@@ -15,4 +15,15 @@ check_sync || test_fail
check_file_messages " 2 1 " 1200 1300 log.packets || test_fail
check_file_messages " 1 2 " 180 220 log.packets || test_fail
server_conf="ratelimit interval 6 burst 2 leak 4 kod 2"
run_test || test_fail
check_chronyd_exit || test_fail
check_packet_interval || test_fail
check_sync || test_fail
check_file_messages " 2 1 " 700 850 log.packets || test_fail
check_file_messages " 1 2 " 350 450 log.packets || test_fail
check_log_messages "Received KoD RATE.*\.123.1" 100 140 || test_fail
test_pass