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Finesse TCP timeouts for upstream connections.

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Timeouts for TCP connections to non-responive servers are very long.
This in not appropriate for DNS connections.

Set timeouts for connection setup, sending data and recieving data.
The timeouts for connection setup and sending data are set at 5 seconds.
For recieving the reply this is doubled, to take into account the
time for usptream to actually get the answer.

Thanks to Petr Menšík for pointing out this problem, and finding a better
and more portable solution than the one in place heretofore.
This commit is contained in:
Simon Kelley
2024-11-25 23:18:07 +00:00
parent 481ff0ed10
commit 32a8f3e009
10 changed files with 113 additions and 85 deletions
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src/config.h
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@@ -18,6 +18,7 @@
#define MAX_PROCS 20 /* default max no children for TCP requests */
#define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
#define TCP_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
#define TCP_TIMEOUT 5 /* timeout waiting to connect to an upstream server - double this for answer */
#define TCP_BACKLOG 32 /* kernel backlog limit for TCP connections */
#define EDNS_PKTSZ 1232 /* default max EDNS.0 UDP packet from from /dnsflagday.net/2020 */
#define KEYBLOCK_LEN 40 /* choose to minimise fragmentation when storing DNSSEC keys */