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Refactor poll() loop.

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Handling events on file descriptors can result in new file
descriptors being created or old ones being deleted. As such
the results of the last call to poll() become invalid in subtle
ways.

After handling each file descriptor in  check_dns_listeners()
return, to go around the poll() loop again and get valid data
for the new situation.

Thanks to Dominik Derigs for his indefatigable sleuthing of this one.
This commit is contained in:
Simon Kelley
2025-01-12 21:36:09 +00:00
parent 51343bd9a2
commit 509afcd1d2
2 changed files with 258 additions and 220 deletions
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2
src/config.h
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@@ -18,7 +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 1 /* timeout waiting to connect to an upstream server - double this for answer */
#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 */