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Further optimisation of --port-limit.

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No longer try and fail to open every port when the port range
is in complete use; go straight to re-using an existing socket.

Die at startup if port range is smaller than --port-limit, since
the code behaves badly in this case.
This commit is contained in:
Simon Kelley
2022-09-09 18:18:46 +01:00
parent 3f56bb8ba1
commit c0e731d545
4 changed files with 64 additions and 15 deletions
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src/config.h
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@@ -24,6 +24,7 @@
#define KEYBLOCK_LEN 40 /* choose to minimise fragmentation when storing DNSSEC keys */
#define DNSSEC_WORK 50 /* Max number of queries to validate one question */
#define TIMEOUT 10 /* drop UDP queries after TIMEOUT seconds */
#define SMALL_PORT_RANGE 30 /* If DNS port range is smaller than this, use different allocation. */
#define FORWARD_TEST 50 /* try all servers every 50 queries */
#define FORWARD_TIME 20 /* or 20 seconds */
#define UDP_TEST_TIME 60 /* How often to reset our idea of max packet size. */