BUG#13333431 - INCORRECT DEFAULT PORT IN 'SHOW SLAVE HOSTS' OUTPUT

Problem - The default port number shown in SHOW SLAVE HOSTS is always 3306 
          though the slave is actually listening on a different port number.
          This is a problem as the user can not be sure whether this port 
          value can be trusted and so client trying to read replication 
          topology can get confused.

Fix - 3306 ceases to be the default value of report-port. Moreover report-port
      does not have a static default any longer.
      Instead we initialize report-port to 0 as the new default value and change
      it based on two checks :

      1) If report_port is not set, the slave reports the port number its listening 
         on. (i.e. if report-port is not set we get the actual value of the slave's 
         port number).

      2) If report-port is set, we show the value report-port is set to, as the slave's
         port number.

mysql-test/include/show_slave_hosts.inc:
  A .inc file is added to use show slave hosts in the new test added.
mysql-test/r/mysqld--help-notwin.result:
  Updated the result file to show the default value passed for report-port.
mysql-test/suite/rpl/r/rpl_report_port.result:
  The result file for the new test that is added.
mysql-test/suite/rpl/r/rpl_show_slave_hosts.result:
  Updated the result file to show the default value passed for report-port.
mysql-test/suite/rpl/t/rpl_report_port-slave.opt:
  Option file for the new test added.
mysql-test/suite/rpl/t/rpl_report_port.test:
  Added a test to check the correct functionality of report-port. 
  We check this by running the replication twice. 
          
  In the first run we do not set the value of report-port through the opt file 
  and get the actual port number of the slave's port.
          
  We then restart the server with report-port set to some value (in this case 9000)
  and check the value reported for the slave's port number.
mysql-test/suite/sys_vars/t/report_port_basic.test:
  Update the test file to show the value for report-port. It is replaced with
  SLAVE_PORT as the actual value of the report-port will change with each run.
sql/mysqld.cc:
  Changed the value reported by report port :
          
  1. If the value for report-port is not set we assign report-port to be the 
     actual port number of the slave (mysqld_port).
  
  2. If report-port is set we get the value set for the report-port.
sql/sys_vars.cc:
  Passed 0 as the default value of the report-port.

mysql-test/include/show_slave_hosts.inc

+--replace_result $SLAVE_MYPORT SLAVE_PORT $DEFAULT_MASTER_PORT DEFAULT_PORT
+--replace_regex /[0-9, a-f]{8}-[0-9, a-f]{4}-[0-9, a-f]{4}-[0-9, a-f]{4}-[0-9, a-f]{12}/SLAVE_UUID/
+SHOW SLAVE HOSTS;

mysql-test/r/mysqld--help-notwin.result

@@ -915,7 +915,7 @@ relay-log-space-limit 0
 replicate-same-server-id FALSE
 report-host (No default value)
 report-password (No default value)
-report-port 3306
+report-port 0
 report-user (No default value)
 rpl-recovery-rank 0
 safe-user-create FALSE

mysql-test/suite/rpl/r/rpl_report_port.result

+include/master-slave.inc
+[connection master]
+[The default value shown for the slave's port number is the actual port number of the slave]
+SHOW SLAVE HOSTS;
+Server_id	Host	Port	Master_id
+2	127.0.0.1	SLAVE_PORT	1
+[The default value shown for the slave's port number is the actual port number of the slave]
+include/rpl_restart_server.inc [server_number=2 parameters: --report-port=9000]
+include/start_slave.inc
+[Slave restarted with the report-port set to some value]
+[The value shown for the slave's port number is 9000 which is the value set for report-port]
+SHOW SLAVE HOSTS;
+Server_id	Host	Port	Master_id
+2	127.0.0.1	9000	1
+include/rpl_end.inc

mysql-test/suite/rpl/r/rpl_show_slave_hosts.result

@@ -6,7 +6,7 @@ START SLAVE IO_THREAD;
 include/wait_for_slave_io_to_start.inc
 SHOW SLAVE HOSTS;
 Server_id	Host	Port	Master_id
-3	slave2	DEFAULT_PORT	1
+3	slave2	SLAVE_PORT	1
 2		SLAVE_PORT	1
 include/stop_slave_io.inc
 SHOW SLAVE HOSTS;

mysql-test/suite/rpl/t/rpl_report_port-slave.opt

+--report-port=

mysql-test/suite/rpl/t/rpl_report_port.test

+#
+#BUG#13333431 : INCORRECT DEFAULT PORT IN 'SHOW SLAVE HOSTS' OUTPUT 
+#
+# ==== Purpose ====
+#
+# The test show the default value printed for the slave's port number if the 
+# --report-port= <some value> is not set on the slave. This is different from
+# the present scenario which show 3306 as the default value if the report-port 
+# is not set on the slave. 
+#
+#====Method====
+#
+# Start replication with report port not set.This will give the actual port 
+# number of the slave (ie. SLAVE_PORT) for the on doing SHOW SLAVE HOSTS on 
+# the master.
+# Restart the slave server with report port set to 9000 and start the slave.
+# In this case on doing SHOW SLAVE HOSTS on the master, we get the port number
+# of the slave to be 9000.
+
+source include/master-slave.inc;
+
+connection master;
+
+--echo [The default value shown for the slave's port number is the actual port number of the slave]
+source include/show_slave_hosts.inc;
+
+# SLAVE_PORT is the value of the port we should get.
+
+let $show_statement= SHOW SLAVE HOSTS;
+let $field= Port;
+let $condition= 'SLAVE_PORT';
+source include/wait_show_condition.inc; 
+--echo [The default value shown for the slave's port number is the actual port number of the slave]
+
+# Start the server with some value being passed to the report_port= <option>
+# this will be used incase we have to mask the value of the slave's port
+# number in certain situations.
+
+--let $rpl_server_number= 2
+--let $rpl_server_parameters= --report-port=9000
+--source include/rpl_restart_server.inc
+    
+connection slave;
+--source include/start_slave.inc
+
+--echo [Slave restarted with the report-port set to some value]
+connection master;
+
+--echo [The value shown for the slave's port number is 9000 which is the value set for report-port]
+--source include/show_slave_hosts.inc
+
+# 9000 is the value of the port we should get.
+
+let $show_statement= SHOW SLAVE HOSTS;
+let $field= Port;
+let $condition= '9000';
+source include/wait_show_condition.inc;
+
+--source include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_show_slave_hosts.test

@@ -25,6 +25,7 @@ let $field= Server_id;
 # 3 is server_id of slave2.
 let $condition= ='3';
 source include/wait_show_condition.inc;
+--replace_column 3 'SLAVE_PORT'
 --replace_result $SLAVE_MYPORT SLAVE_PORT $DEFAULT_MASTER_PORT DEFAULT_PORT
 SHOW SLAVE HOSTS;
 

mysql-test/suite/sys_vars/t/report_port_basic.test

@@ -2,18 +2,19 @@
 #
 # only global
 #
---replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
+--replace_regex s/[0-9]+/DEFAULT_MASTER_PORT/
 select @@global.report_port;
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
 select @@session.report_port;
---replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
+--replace_column 2 'DEFAULT_MASTER_PORT'
 show global variables like 'report_port';
---replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
+--replace_column 2 'DEFAULT_MASTER_PORT'
 show session variables like 'report_port';
---replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
+--replace_column 2 'DEFAULT_MASTER_PORT'
 select * from information_schema.global_variables where variable_name='report_port';
---replace_result $DEFAULT_MASTER_PORT DEFAULT_MASTER_PORT
+--replace_column 2 'DEFAULT_MASTER_PORT'
 select * from information_schema.session_variables where variable_name='report_port';
+--replace_column 2 'DEFAULT_MASTER_PORT'
 
 #
 # show that it's read-only

sql/mysqld.cc

@@ -656,7 +656,7 @@ int mysqld_server_started= 0;
 File_parser_dummy_hook file_parser_dummy_hook;
 
 /* replication parameters, if master_host is not NULL, we are a slave */
-uint report_port= MYSQL_PORT;
+uint report_port= 0;
 ulong master_retry_count=0;
 char *master_info_file;
 char *relay_log_info_file, *report_user, *report_password, *report_host;
@@ -1784,6 +1784,11 @@ static void network_init(void)
 
   set_ports();
 
+  if (report_port == 0)
+  {
+    report_port= mysqld_port;
+  }
+  DBUG_ASSERT(report_port != 0);
   if (mysqld_port != 0 && !opt_disable_networking && !opt_bootstrap)
   {
     struct addrinfo *ai, *a;

sql/sys_vars.cc

@@ -2768,7 +2768,7 @@ static Sys_var_uint Sys_repl_report_port(
        "port or if you have a special tunnel from the master or other clients "
        "to the slave. If not sure, leave this option unset",
        READ_ONLY GLOBAL_VAR(report_port), CMD_LINE(REQUIRED_ARG),
-       VALID_RANGE(0, UINT_MAX), DEFAULT(MYSQL_PORT), BLOCK_SIZE(1));
+       VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
 #endif
 
 static Sys_var_mybool Sys_keep_files_on_create(