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Add --fast-dns-retry option.

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This gives dnsmasq the ability to originate retries for upstream DNS
queries itself, rather than relying on the downstream client. This is
most useful when doing DNSSEC over unreliable upstream network. It
comes with some cost in memory usage and network bandwidth.
This commit is contained in:
Simon Kelley
2022-08-21 18:07:17 +01:00
parent 24c3b5b3d4
commit d21438a7df
7 changed files with 166 additions and 44 deletions
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13
src/dnsmasq.c
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@@ -1055,19 +1055,20 @@ int main (int argc, char **argv)
while (1)
{
int timeout = -1;
int timeout = fast_retry(now);
poll_reset();
/* Whilst polling for the dbus, or doing a tftp transfer, wake every quarter second */
if (daemon->tftp_trans ||
(option_bool(OPT_DBUS) && !daemon->dbus))
if ((daemon->tftp_trans || (option_bool(OPT_DBUS) && !daemon->dbus)) &&
(timeout == -1 || timeout > 250))
timeout = 250;
/* Wake every second whilst waiting for DAD to complete */
else if (is_dad_listeners())
else if (is_dad_listeners() &&
(timeout == -1 || timeout > 1000))
timeout = 1000;
set_dns_listeners();
#ifdef HAVE_DBUS