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/*-------------------------------------------------------------------------
*
* logtofile.c
* Main entry point for logtofile
*
* Copyright (c) 2020-2026, Francisco Miguel Biete Banon
*
* This code is released under the PostgreSQL licence, as given at
* http://www.postgresql.org/about/licence/
*-------------------------------------------------------------------------
*/
#include "logtofile.h"
#include "logtofile_bgw.h"
#include "logtofile_connect.h"
#include "logtofile_guc.h"
#include "logtofile_log.h"
#include "logtofile_shmem.h"
#include "logtofile_vars.h"
#include <postgres.h>
/* these are always necessary for a bgworker */
#include <miscadmin.h>
#include <postmaster/bgworker.h>
#include <storage/ipc.h>
#include <storage/latch.h>
#include <storage/lwlock.h>
#include <storage/proc.h>
#include <storage/shm_mq.h>
#include <storage/shm_toc.h>
#include <storage/shmem.h>
#include <utils/guc.h>
#include <datatype/timestamp.h>
#include <pgstat.h>
/**
* @brief Main entry point for the extension
* @param void
* @return void
*/
void _PG_init(void)
{
BackgroundWorker worker;
if (!process_shared_preload_libraries_in_progress)
{
ereport(ERROR, (
errmsg("pgauditlogtofile can only be loaded via shared_preload_libraries"),
errhint("Add pgauditlogtofile to the shared_preload_libraries configuration variable in postgresql.conf.")));
}
/* guc variables */
DefineCustomStringVariable(
"pgaudit.log_directory",
"Directory where to spool log data", NULL,
&guc_pgaudit_ltf_log_directory,
"log",
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_SUPERUSER_ONLY,
PgAuditLogToFile_guc_check_directory, NULL, NULL);
DefineCustomStringVariable(
"pgaudit.log_filename",
"Filename with time patterns (up to minutes) where to spool audit data", NULL,
&guc_pgaudit_ltf_log_filename,
"audit-%Y%m%d_%H%M.log",
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_SUPERUSER_ONLY,
NULL, NULL, NULL);
DefineCustomIntVariable(
"pgaudit.log_file_mode",
"Sets the file permissions for log files", NULL,
&guc_pgaudit_ltf_log_file_mode,
0600, 0000, 0666,
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_SUPERUSER_ONLY,
NULL, NULL, PgAuditLogToFile_guc_show_file_mode);
DefineCustomIntVariable(
"pgaudit.log_rotation_age",
"Automatic spool file rotation will occur after N minutes", NULL,
&guc_pgaudit_ltf_log_rotation_age,
HOURS_PER_DAY * MINS_PER_HOUR, 1, INT_MAX / SECS_PER_MINUTE,
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_UNIT_MIN | GUC_SUPERUSER_ONLY,
NULL, NULL, NULL);
DefineCustomBoolVariable(
"pgaudit.log_connections",
"Intercepts log_connections messages", NULL,
&guc_pgaudit_ltf_log_connections,
false,
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_SUPERUSER_ONLY,
NULL, NULL, NULL);
DefineCustomBoolVariable(
"pgaudit.log_disconnections",
"Intercepts log_disconnections messages", NULL,
&guc_pgaudit_ltf_log_disconnections,
false,
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_SUPERUSER_ONLY,
NULL, NULL, NULL);
DefineCustomIntVariable(
"pgaudit.log_autoclose_minutes",
"Automatic spool file closure by backend after N minutes of inactivity", NULL,
&guc_pgaudit_ltf_auto_close_minutes,
0, 0, INT_MAX / MINS_PER_HOUR,
PGC_SIGHUP,
GUC_NOT_IN_SAMPLE | GUC_UNIT_MIN | GUC_SUPERUSER_ONLY, NULL, NULL, NULL);
DefineCustomStringVariable(
"pgaudit.log_format",
"Format of the audit data (csv or json)", NULL,
&guc_pgaudit_ltf_log_format,
"csv",
PGC_SIGHUP, GUC_NOT_IN_SAMPLE | GUC_SUPERUSER_ONLY,
PgAuditLogToFile_guc_check_log_format, NULL, NULL);
EmitWarningsOnPlaceholders("pgauditlogtofile");
/* background worker */
MemSet(&worker, 0, sizeof(BackgroundWorker));
worker.bgw_flags = BGWORKER_SHMEM_ACCESS;
worker.bgw_start_time = BgWorkerStart_ConsistentState;
worker.bgw_restart_time = 1;
worker.bgw_main_arg = Int32GetDatum(0);
worker.bgw_notify_pid = 0;
sprintf(worker.bgw_library_name, "pgauditlogtofile");
sprintf(worker.bgw_function_name, "PgAuditLogToFileMain");
snprintf(worker.bgw_name, BGW_MAXLEN, "pgauditlogtofile launcher");
RegisterBackgroundWorker(&worker);
/* backend hooks */
#if (PG_VERSION_NUM >= 150000)
pgaudit_ltf_prev_shmem_request_hook = shmem_request_hook;
shmem_request_hook = PgAuditLogToFile_shmem_request;
#else
RequestAddinShmemSpace(MAXALIGN(sizeof(PgAuditLogToFileShm)));
RequestNamedLWLockTranche("pgauditlogtofile", 1);
#endif
pgaudit_ltf_prev_shmem_startup_hook = shmem_startup_hook;
shmem_startup_hook = PgAuditLogToFile_shmem_startup;
pgaudit_ltf_prev_emit_log_hook = emit_log_hook;
emit_log_hook = PgAuditLogToFile_emit_log;
}
/**
* @brief Extension finalization
* @param void
* @return void
*/
void _PG_fini(void)
{
emit_log_hook = pgaudit_ltf_prev_emit_log_hook;
shmem_startup_hook = pgaudit_ltf_prev_shmem_startup_hook;
}
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