database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-03 09:13:20 +03:00
Code Activity

Avoid picking already-bound TCP ports in kerberos and ldap test suites.

Browse Source 
src/test/kerberos and src/test/ldap need to run a private authentication
server of the relevant type, for which they need a free TCP port.
They were just picking a random port number in 48K-64K, which works
except when something's already using the particular port.  Notably,
the probability of failure rises dramatically if one simply runs those
tests in a tight loop, because each test cycle leaves behind a bunch of
high ports that are transiently in TIME_WAIT state.

To fix, split out the code that PostgresNode.pm already had for
identifying a free TCP port number, so that it can be invoked to choose
a port for the KDC or LDAP server.  This isn't 100% bulletproof, since
conceivably something else on the machine could grab the port between
the time we check and the time we actually start the server.  But that's
a pretty short window, so in practice this should be good enough.

Back-patch to v11 where these test suites were added.

Patch by me, reviewed by Andrew Dunstan.

Discussion: https://postgr.es/m/3397.1564872168@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2019-08-04 13:07:12 -04:00
parent 489247b0e6
commit 803466b6ff
3 changed files with 88 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/test/ldap/t/001_auth.pl
View File

@@ -55,7 +55,7 @@ my $slapd_pidfile = "${TestLib::tmp_check}/slapd.pid";
my $slapd_logfile = "${TestLib::tmp_check}/slapd.log";
my $ldap_conf = "${TestLib::tmp_check}/ldap.conf";
my $ldap_server = 'localhost';
my $ldap_port = int(rand() * 16384) + 49152;
my $ldap_port = get_free_port();
my $ldaps_port = $ldap_port + 1;
my $ldap_url = "ldap://$ldap_server:$ldap_port";
my $ldaps_url = "ldaps://$ldap_server:$ldaps_port";