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Bump TCP connection backlog from 5 to 32.

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This commit is contained in:
Simon Kelley
2016-12-22 22:16:58 +00:00
parent a1d973f987
commit 09b768efa4
3 changed files with 7 additions and 1 deletions
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5
CHANGELOG
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@@ -39,6 +39,11 @@ version 2.77
For example --cname=*.example.com,default.example.com For example --cname=*.example.com,default.example.com
Thanks to Pro Backup for sponsoring this development. Thanks to Pro Backup for sponsoring this development.
Bump the allowed backlog of TCP connections from 5 to 32,
and make this a compile-time configurable option. Thanks
to Donatas Abraitis for diagnosing this as a potential
problem.
version 2.76 version 2.76
Include 0.0.0.0/8 in DNS rebind checks. This range Include 0.0.0.0/8 in DNS rebind checks. This range

1
src/config.h
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@@ -18,6 +18,7 @@
#define MAX_PROCS 20 /* max no children for TCP requests */ #define MAX_PROCS 20 /* max no children for TCP requests */
#define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */ #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_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
#define TCP_BACKLOG 32 /* kernel backlog limit for TCP connections */
#define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */ #define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
#define SAFE_PKTSZ 1280 /* "go anywhere" UDP packet size */ #define SAFE_PKTSZ 1280 /* "go anywhere" UDP packet size */
#define KEYBLOCK_LEN 40 /* choose to mininise fragmentation when storing DNSSEC keys */ #define KEYBLOCK_LEN 40 /* choose to mininise fragmentation when storing DNSSEC keys */

2
src/network.c
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@@ -746,7 +746,7 @@ static int make_sock(union mysockaddr *addr, int type, int dienow)
if (type == SOCK_STREAM) if (type == SOCK_STREAM)
{ {
if (listen(fd, 5) == -1) if (listen(fd, TCP_BACKLOG) == -1)
goto err; goto err;
} }
else if (family == AF_INET) else if (family == AF_INET)