[pgpool-committers: 892] pgpool: Add authentication mechanism for watchdog packet communication

[Yugo Nagata]

Add authentication mechanism for watchdog packet communication

Watchdog packets from pgpool having wrong authentication key are
rejected. All pgpools must have the same key, which is specified
option wd_authkey in pgpool.conf. pgpool with wrong authkey can't
even start watchdog, because the startup packet is rejected by other
pgpools.

Branch
------
feature/watchdog_for_v3_3

Details
-------
http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=5bc8c654bd774020f1cdc8f097ff36d78f72e1c2

Modified Files
--------------
pgpool.conf.sample      |   44 +++++++++++---------
pool_config.c           |    6 +-
pool_config.h           |    2 +-
pool_config.l           |    6 +-
watchdog/watchdog.c     |    6 ++-
watchdog/watchdog.h     |    7 ++-
watchdog/wd_child.c     |   25 ++++++++++-
watchdog/wd_ext.h       |    4 ++
watchdog/wd_interlock.c |    2 +-
watchdog/wd_packet.c    |  105 +++++++++++++++++++++++++++++++++++++++++++++++
watchdog/wd_udp.c       |   54 ++++++++----------------
11 files changed, 191 insertions(+), 70 deletions(-)