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# Suppress warnings if IP address cannot not be resolved.
call mtr.add_suppression("192.0.2.4");
# Enforce a clean state
flush status;
TRUNCATE TABLE performance_schema.host_cache;
flush user_resources;
flush privileges;
select @@global.debug;
@@global.debug
select @@global.max_connect_errors;
@@global.max_connect_errors
100
select @@global.max_user_connections;
@@global.max_user_connections
0
select @@global.max_connections;
@@global.max_connections
151
select `User`, `Host` from mysql.`user` where `host` like '%\\%%';
User Host
select `User`, `Host` from mysql.`user` where `user` like '192.%';
User Host
select `User`, `Host` from mysql.`user` where `user` like '2001:%';
User Host
select `User`, `Host` from mysql.`user` where `user` like 'santa.claus.%';
User Host
TRUNCATE TABLE performance_schema.accounts;
#########################################################################
#
# Bug#29704941 CONNECTION PASSES FOR HOSTNAME LONGER THAN 255 CHARACTERS
#
#########################################################################
# Simulate fake ipv4 host address 192.0.2.4 and create a user.
SET GLOBAL DEBUG = '+d, vio_peer_addr_fake_ipv4, getaddrinfo_fake_good_ipv4';
CREATE USER 'rick'@'192.0.2.4';
# CASE 1: Simulate hostname length = HOSTNAME_LENGTH + 1 characters.
# The hostname will be "aaaa..... <upto 256 chars>".
SET GLOBAL DEBUG = '+d, getnameinfo_fake_max_length_plus_1';
# Try to connect. Should not be allowed.
connect(127.0.0.1,rick,,test,MASTER_PORT,MASTER_SOCKET);
ERROR HY000: Hostname cannot be longer than 255 characters.
SET GLOBAL DEBUG = '-d, getnameinfo_fake_max_length_plus_1';
# CASE 2: Simulate hostname length = HOSTNAME_LENGTH characters.
# The hostname will be "aaaa..... <upto 255 chars>".
SET GLOBAL DEBUG = '+d, getnameinfo_fake_max_length';
# Try to connect. Should be allowed.
SELECT CURRENT_USER();
CURRENT_USER()
rick@192.0.2.4
# Check for successfully connected host in P_S.
SHOW VARIABLES LIKE 'performance_schema';
Variable_name Value
performance_schema ON
SELECT host FROM performance_schema.hosts WHERE host LIKE 'aaaa%';
host
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
SELECT user, host FROM performance_schema.accounts WHERE user='rick';
user host
rick aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
SELECT ip, host FROM performance_schema.host_cache WHERE host LIKE 'aaaa%';
ip host
192.0.2.4 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
SET GLOBAL DEBUG = '-d, getnameinfo_fake_max_length';
SET GLOBAL DEBUG = '-d, vio_peer_addr_fake_ipv4, getaddrinfo_fake_good_ipv4';
# Clean up
DROP USER 'rick'@'192.0.2.4';
SET GLOBAL DEBUG = default;
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