Add pg_audit, an auditing extension

This extension provides detailed logging classes, ability to control
logging at a per-object level, and includes fully-qualified object
names for logged statements (DML and DDL) in independent fields of the
log output.

Authors: Ian Barwick, Abhijit Menon-Sen, David Steele
Reviews by: Robert Haas, Tatsuo Ishii, Sawada Masahiko, Fujii Masao,
Simon Riggs

Discussion with: Josh Berkus, Jaime Casanova, Peter Eisentraut,
David Fetter, Yeb Havinga, Alvaro Herrera, Petr Jelinek, Tom Lane,
MauMau, Bruce Momjian, Jim Nasby, Michael Paquier,
Fabrízio de Royes Mello, Neil Tiffin

contrib/Makefile

@@ -28,6 +28,7 @@ SUBDIRS = \
 		oid2name	\
 		pageinspect	\
 		passwordcheck	\
+		pg_audit	\
 		pg_buffercache	\
 		pg_freespacemap \
 		pg_prewarm	\

contrib/pg_audit/.gitignore

+log/
+results/
+tmp_check/
+regression.diffs
+regression.out

contrib/pg_audit/Makefile

+# pg_audit/Makefile
+
+MODULE = pg_audit
+MODULE_big = pg_audit
+OBJS = pg_audit.o
+
+EXTENSION = pg_audit
+REGRESS = pg_audit
+REGRESS_OPTS = --temp-config=$(top_srcdir)/contrib/pg_audit/pg_audit.conf
+DATA = pg_audit--1.0.0.sql
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = contrib/pg_audit
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif

contrib/pg_audit/pg_audit--1.0.0.sql

+/* pg_audit/pg_audit--1.0.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION pg_audit" to load this file.\quit
+
+CREATE FUNCTION pg_audit_ddl_command_end()
+	RETURNS event_trigger
+	LANGUAGE C
+	AS 'MODULE_PATHNAME', 'pg_audit_ddl_command_end';
+
+CREATE EVENT TRIGGER pg_audit_ddl_command_end
+	ON ddl_command_end
+	EXECUTE PROCEDURE pg_audit_ddl_command_end();
+
+CREATE FUNCTION pg_audit_sql_drop()
+	RETURNS event_trigger
+	LANGUAGE C
+	AS 'MODULE_PATHNAME', 'pg_audit_sql_drop';
+
+CREATE EVENT TRIGGER pg_audit_sql_drop
+	ON sql_drop
+	EXECUTE PROCEDURE pg_audit_sql_drop();

contrib/pg_audit/pg_audit.conf

+shared_preload_libraries = pg_audit

contrib/pg_audit/pg_audit.control

+# pg_audit extension
+comment = 'provides auditing functionality'
+default_version = '1.0.0'
+module_pathname = '$libdir/pg_audit'
+relocatable = true

doc/src/sgml/contrib.sgml

@@ -124,6 +124,7 @@ CREATE EXTENSION <replaceable>module_name</> FROM unpackaged;
  &ltree;
  &pageinspect;
  &passwordcheck;
+ &pgaudit;
  &pgbuffercache;
  &pgcrypto;
  &pgfreespacemap;

doc/src/sgml/filelist.sgml

@@ -126,6 +126,7 @@
 <!ENTITY oid2name        SYSTEM "oid2name.sgml">
 <!ENTITY pageinspect     SYSTEM "pageinspect.sgml">
 <!ENTITY passwordcheck   SYSTEM "passwordcheck.sgml">
+<!ENTITY pgaudit         SYSTEM "pgaudit.sgml">
 <!ENTITY pgbuffercache   SYSTEM "pgbuffercache.sgml">
 <!ENTITY pgcrypto        SYSTEM "pgcrypto.sgml">
 <!ENTITY pgfreespacemap  SYSTEM "pgfreespacemap.sgml">