logconfig.c
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logconfig.c
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	/*
	* Copyright (c) 2002-2005 MontaVista Software, Inc.
	* Copyright (c) 2006-2011 Red Hat, Inc.
	*
	* All rights reserved.
	*
	* Author: Steven Dake (sdake@redhat.com)
	* Jan Friesse (jfriesse@redhat.com)
	*
	* This software licensed under BSD license, the text of which follows:
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* - Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	* - Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	* - Neither the name of the MontaVista Software, Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"

	#include <corosync/totem/totem.h>
	#include <corosync/logsys.h>
	#ifdef LOGCONFIG_USE_ICMAP
	#include <corosync/icmap.h>
	#define MAP_KEYNAME_MAXLEN ICMAP_KEYNAME_MAXLEN
	#define map_get_string(key_name, value) icmap_get_string(key_name, value)
	#else
	#include <corosync/cmap.h>
	static cmap_handle_t cmap_handle;
	static const char *main_logfile;
	#define MAP_KEYNAME_MAXLEN CMAP_KEYNAME_MAXLEN
	#define map_get_string(key_name, value) cmap_get_string(cmap_handle, key_name, value)
	#endif

	#include "util.h"
	#include "logconfig.h"

	static char error_string_response[512];

	/**
	* insert_into_buffer
	* @target_buffer: a buffer where to write results
	* @bufferlen: tell us the size of the buffer to avoid overflows
	* @entry: entry that needs to be added to the buffer
	* @after: can either be NULL or set to a string.
	* if NULL, @entry is prependend to logsys_format_get buffer.
	* if set, @entry is added immediately after @after.
	*
	* Since the function is specific to logsys_format_get handling, it is implicit
	* that source is logsys_format_get();
	*
	* In case of failure, target_buffer could be left dirty. So don't trust
	* any data leftover in it.
	*
	* Searching for "after" assumes that there is only entry of "after"
	* in the source. Afterall we control the string here and for logging format
	* it makes little to no sense to have duplicate format entries.
	*
	* Returns: 0 on success, -1 on failure
	**/
	static int insert_into_buffer(
	char *target_buffer,
	size_t bufferlen,
	const char *entry,
	const char *after)
	{
	const char *current_format = NULL;

	current_format = logsys_format_get();

	/* if the entry is already in the format we don't add it again */
	if (strstr(current_format, entry) != NULL) {
	return -1;
	}

	/* if there is no "after", simply prepend the requested entry
	* otherwise go for beautiful string manipulation.... </sarcasm> */
	if (!after) {
	if (snprintf(target_buffer, bufferlen - 1, "%s%s",
	entry,
	current_format) >= bufferlen - 1) {
	return -1;
	}
	} else {
	const char *afterpos;
	size_t afterlen;
	size_t templen;

	/* check if after is contained in the format
	* and afterlen has a meaning or return an error */
	afterpos = strstr(current_format, after);
	afterlen = strlen(after);
	if ((!afterpos) \|\| (!afterlen)) {
	return -1;
	}

	templen = afterpos - current_format + afterlen;
	if (snprintf(target_buffer, templen + 1, "%s", current_format)
	>= bufferlen - 1) {
	return -1;
	}
	if (snprintf(target_buffer + templen, bufferlen - ( templen + 1 ),
	"%s%s", entry, current_format + templen)
	>= bufferlen - ( templen + 1 )) {
	return -1;
	}
	}
	return 0;
	}

	/*
	* format set is the only global specific option that
	* doesn't apply at system/subsystem level.
	*/
	static int corosync_main_config_format_set (
	const char **error_string)
	{
	const char *error_reason;
	char new_format_buffer[PATH_MAX];
	char *value = NULL;
	int err = 0;

	if (map_get_string("logging.fileline", &value) == CS_OK) {
	if (strcmp (value, "on") == 0) {
	if (!insert_into_buffer(new_format_buffer,
	sizeof(new_format_buffer),
	" %f:%l", "g]")) {
	err = logsys_format_set(new_format_buffer);
	} else
	if (!insert_into_buffer(new_format_buffer,
	sizeof(new_format_buffer),
	"%f:%l", NULL)) {
	err = logsys_format_set(new_format_buffer);
	}
	} else
	if (strcmp (value, "off") == 0) {
	/* nothing to do here */
	} else {
	error_reason = "unknown value for fileline";
	free(value);
	goto parse_error;
	}

	free(value);
	}

	if (err) {
	error_reason = "not enough memory to set logging format buffer";
	goto parse_error;
	}

	if (map_get_string("logging.function_name", &value) == CS_OK) {
	if (strcmp (value, "on") == 0) {
	if (!insert_into_buffer(new_format_buffer,
	sizeof(new_format_buffer),
	"%n:", "f:")) {
	err = logsys_format_set(new_format_buffer);
	} else
	if (!insert_into_buffer(new_format_buffer,
	sizeof(new_format_buffer),
	" %n", "g]")) {
	err = logsys_format_set(new_format_buffer);
	}
	} else
	if (strcmp (value, "off") == 0) {
	/* nothing to do here */
	} else {
	error_reason = "unknown value for function_name";
	free(value);
	goto parse_error;
	}

	free(value);
	}

	if (err) {
	error_reason = "not enough memory to set logging format buffer";
	goto parse_error;
	}

	if (map_get_string("logging.timestamp", &value) == CS_OK) {
	if (strcmp (value, "on") == 0) {
	if(!insert_into_buffer(new_format_buffer,
	sizeof(new_format_buffer),
	"%t ", NULL)) {
	err = logsys_format_set(new_format_buffer);
	}
	} else
	if (strcmp (value, "off") == 0) {
	/* nothing to do here */
	} else {
	error_reason = "unknown value for timestamp";
	free(value);
	goto parse_error;
	}

	free(value);
	}

	if (err) {
	error_reason = "not enough memory to set logging format buffer";
	goto parse_error;
	}

	return (0);

	parse_error:
	*error_string = error_reason;

	return (-1);
	}

	static int corosync_main_config_log_destination_set (
	const char *path,
	const char *key,
	const char *subsys,
	const char **error_string,
	unsigned int mode_mask,
	char deprecated,
	char default_value,
	const char *replacement)
	{
	static char formatted_error_reason[128];
	char *value = NULL;
	unsigned int mode;
	char key_name[MAP_KEYNAME_MAXLEN];

	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, key);
	if (map_get_string(key_name, &value) == CS_OK) {
	if (deprecated) {
	log_printf(LOGSYS_LEVEL_WARNING,
	"Warning: the %s config parameter has been obsoleted."
	" See corosync.conf man page %s directive.",
	key, replacement);
	}

	mode = logsys_config_mode_get (subsys);

	if (strcmp (value, "yes") == 0 \|\| strcmp (value, "on") == 0) {
	mode \|= mode_mask;
	if (logsys_config_mode_set(subsys, mode) < 0) {
	sprintf (formatted_error_reason, "unable to set mode %s", key);
	goto parse_error;
	}
	} else
	if (strcmp (value, "no") == 0 \|\| strcmp (value, "off") == 0) {
	mode &= ~mode_mask;
	if (logsys_config_mode_set(subsys, mode) < 0) {
	sprintf (formatted_error_reason, "unable to unset mode %s", key);
	goto parse_error;
	}
	} else {
	sprintf (formatted_error_reason, "unknown value for %s", key);
	goto parse_error;
	}
	}
	/* Set to default if we are the top-level logger */
	else if (!subsys && !deprecated) {

	mode = logsys_config_mode_get (subsys);
	if (default_value) {
	mode \|= mode_mask;
	}
	else {
	mode &= ~mode_mask;
	}
	if (logsys_config_mode_set(subsys, mode) < 0) {
	sprintf (formatted_error_reason, "unable to change mode %s", key);
	goto parse_error;
	}
	}

	free(value);
	return (0);

	parse_error:
	*error_string = formatted_error_reason;
	free(value);
	return (-1);
	}

	static int corosync_main_config_set (
	const char *path,
	const char *subsys,
	const char **error_string)
	{
	const char *error_reason = error_string_response;
	char *value = NULL;
	int mode;
	char key_name[MAP_KEYNAME_MAXLEN];

	/*
	* this bit abuses the internal logsys exported API
	* to guarantee that all configured subsystems are
	* initialized too.
	*
	* using this approach avoids some headaches caused
	* by IPC and TOTEM that have a special logging
	* handling requirements
	*/
	if (subsys != NULL) {
	if (_logsys_subsys_create(subsys, NULL) < 0) {
	error_reason = "unable to create new logging subsystem";
	goto parse_error;
	}
	}

	mode = logsys_config_mode_get(subsys);
	if (mode < 0) {
	error_reason = "unable to get mode";
	goto parse_error;
	}

	if (corosync_main_config_log_destination_set (path, "to_stderr", subsys, &error_reason,
	LOGSYS_MODE_OUTPUT_STDERR, 0, 1, NULL) != 0)
	goto parse_error;

	if (corosync_main_config_log_destination_set (path, "to_syslog", subsys, &error_reason,
	LOGSYS_MODE_OUTPUT_SYSLOG, 0, 1, NULL) != 0)
	goto parse_error;

	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, "syslog_facility");
	if (map_get_string(key_name, &value) == CS_OK) {
	int syslog_facility;

	syslog_facility = qb_log_facility2int(value);
	if (syslog_facility < 0) {
	error_reason = "unknown syslog facility specified";
	goto parse_error;
	}
	if (logsys_config_syslog_facility_set(subsys,
	syslog_facility) < 0) {
	error_reason = "unable to set syslog facility";
	goto parse_error;
	}

	free(value);
	}
	else {
	/* Set default here in case of a reload */
	if (logsys_config_syslog_facility_set(subsys,
	qb_log_facility2int("daemon")) < 0) {
	error_reason = "unable to set syslog facility";
	goto parse_error;
	}
	}

	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, "syslog_level");
	if (map_get_string(key_name, &value) == CS_OK) {
	int syslog_priority;

	log_printf(LOGSYS_LEVEL_WARNING,
	"Warning: the syslog_level config parameter has been obsoleted."
	" See corosync.conf man page syslog_priority directive.");

	syslog_priority = logsys_priority_id_get(value);
	free(value);

	if (syslog_priority < 0) {
	error_reason = "unknown syslog level specified";
	goto parse_error;
	}
	if (logsys_config_syslog_priority_set(subsys,
	syslog_priority) < 0) {
	error_reason = "unable to set syslog level";
	goto parse_error;
	}
	}

	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, "syslog_priority");
	if (map_get_string(key_name, &value) == CS_OK) {
	int syslog_priority;

	syslog_priority = logsys_priority_id_get(value);
	free(value);
	if (syslog_priority < 0) {
	error_reason = "unknown syslog priority specified";
	goto parse_error;
	}
	if (logsys_config_syslog_priority_set(subsys,
	syslog_priority) < 0) {
	error_reason = "unable to set syslog priority";
	goto parse_error;
	}
	}
	else {
	if (logsys_config_syslog_priority_set(subsys,
	logsys_priority_id_get("info")) < 0) {
	error_reason = "unable to set syslog level";
	goto parse_error;
	}
	}

	#ifdef LOGCONFIG_USE_ICMAP
	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, "logfile");
	if (map_get_string(key_name, &value) == CS_OK) {
	if (logsys_config_file_set (subsys, &error_reason, value) < 0) {
	goto parse_error;
	}
	free(value);
	}
	#else
	if (!subsys) {
	if (logsys_config_file_set (subsys, &error_reason, main_logfile) < 0) {
	goto parse_error;
	}
	}
	#endif

	if (corosync_main_config_log_destination_set (path, "to_file", subsys, &error_reason,
	LOGSYS_MODE_OUTPUT_FILE, 1, 0, "to_logfile") != 0)
	goto parse_error;

	if (corosync_main_config_log_destination_set (path, "to_logfile", subsys, &error_reason,
	LOGSYS_MODE_OUTPUT_FILE, 0, 0, NULL) != 0)
	goto parse_error;

	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, "logfile_priority");
	if (map_get_string(key_name, &value) == CS_OK) {
	int logfile_priority;

	logfile_priority = logsys_priority_id_get(value);
	free(value);
	if (logfile_priority < 0) {
	error_reason = "unknown logfile priority specified";
	goto parse_error;
	}
	if (logsys_config_logfile_priority_set(subsys,
	logfile_priority) < 0) {
	error_reason = "unable to set logfile priority";
	goto parse_error;
	}
	}
	else {
	if (logsys_config_logfile_priority_set(subsys,
	logsys_priority_id_get("info")) < 0) {
	error_reason = "unable to set syslog level";
	goto parse_error;
	}
	}

	snprintf(key_name, MAP_KEYNAME_MAXLEN, "%s.%s", path, "debug");
	if (map_get_string(key_name, &value) == CS_OK) {
	if (strcmp (value, "trace") == 0) {
	if (logsys_config_debug_set (subsys, LOGSYS_DEBUG_TRACE) < 0) {
	error_reason = "unable to set debug trace";
	free(value);
	goto parse_error;
	}
	} else
	if (strcmp (value, "on") == 0) {
	if (logsys_config_debug_set (subsys, LOGSYS_DEBUG_ON) < 0) {
	error_reason = "unable to set debug on";
	free(value);
	goto parse_error;
	}
	} else
	if (strcmp (value, "off") == 0) {
	if (logsys_config_debug_set (subsys, LOGSYS_DEBUG_OFF) < 0) {
	error_reason = "unable to set debug off";
	free(value);
	goto parse_error;
	}
	} else {
	error_reason = "unknown value for debug";
	free(value);
	goto parse_error;
	}
	free(value);
	}
	else {
	if (logsys_config_debug_set (subsys, LOGSYS_DEBUG_OFF) < 0) {
	error_reason = "unable to set debug off";
	free(value);
	goto parse_error;
	}
	}

	return (0);

	parse_error:
	*error_string = error_reason;

	return (-1);
	}

	static int corosync_main_config_read_logging (
	const char **error_string)
	{
	const char *error_reason;
	#ifdef LOGCONFIG_USE_ICMAP
	icmap_iter_t iter;
	const char *key_name;
	#else
	cmap_iter_handle_t iter;
	char key_name[CMAP_KEYNAME_MAXLEN];
	#endif
	char key_subsys[MAP_KEYNAME_MAXLEN];
	char key_item[MAP_KEYNAME_MAXLEN];
	int res;

	/* format set is supported only for toplevel */
	if (corosync_main_config_format_set(&error_reason) < 0) {
	goto parse_error;
	}

	if (corosync_main_config_set ("logging", NULL, &error_reason) < 0) {
	goto parse_error;
	}

	/*
	* we will need 2 of these to compensate for new logging
	* config format
	*/
	#ifdef LOGCONFIG_USE_ICMAP
	iter = icmap_iter_init("logging.logger_subsys.");
	while ((key_name = icmap_iter_next(iter, NULL, NULL)) != NULL) {
	#else
	cmap_iter_init(cmap_handle, "logging.logger_subsys.", &iter);
	while ((cmap_iter_next(cmap_handle, iter, key_name, NULL, NULL)) == CS_OK) {
	#endif
	res = sscanf(key_name, "logging.logger_subsys.%[^.].%s", key_subsys, key_item);

	if (res != 2) {
	continue ;
	}

	if (strcmp(key_item, "subsys") != 0) {
	continue ;
	}

	snprintf(key_item, MAP_KEYNAME_MAXLEN, "logging.logger_subsys.%s", key_subsys);

	if (corosync_main_config_set(key_item, key_subsys, &error_reason) < 0) {
	goto parse_error;
	}
	}
	#ifdef LOGCONFIG_USE_ICMAP
	icmap_iter_finalize(iter);
	#else
	cmap_iter_finalize(cmap_handle, iter);
	#endif

	logsys_config_apply();
	return 0;

	parse_error:
	*error_string = error_reason;

	return (-1);
	}

	#ifdef LOGCONFIG_USE_ICMAP
	static void main_logging_notify(
	int32_t event,
	const char *key_name,
	struct icmap_notify_value new_val,
	struct icmap_notify_value old_val,
	void *user_data)
	#else
	static void main_logging_notify(
	cmap_handle_t cmap_handle_unused,
	cmap_handle_t cmap_track_handle_unused,
	int32_t event,
	const char *key_name,
	struct cmap_notify_value new_val,
	struct cmap_notify_value old_val,
	void *user_data)
	#endif
	{
	const char *error_string;
	static int reload_in_progress = 0;

	/* If a full reload happens then suspend updates for individual keys until
	* it's all completed
	*/
	if (strcmp(key_name, "config.reload_in_progress") == 0) {
	if ((uint8_t )new_val.data == 1) {
	reload_in_progress = 1;
	} else {
	reload_in_progress = 0;
	}
	}
	if (reload_in_progress) {
	log_printf(LOGSYS_LEVEL_DEBUG, "Ignoring key change, reload in progress. %s\n", key_name);
	return;
	}

	/*
	* Reload the logsys configuration
	*/
	if (logsys_format_set(NULL) == -1) {
	fprintf (stderr, "Unable to setup logging format.\n");
	}
	corosync_main_config_read_logging(&error_string);
	}

	#ifdef LOGCONFIG_USE_ICMAP
	static void add_logsys_config_notification(void)
	{
	icmap_track_t icmap_track = NULL;

	icmap_track_add("logging.",
	ICMAP_TRACK_ADD \| ICMAP_TRACK_DELETE \| ICMAP_TRACK_MODIFY \| ICMAP_TRACK_PREFIX,
	main_logging_notify,
	NULL,
	&icmap_track);

	icmap_track_add("config.reload_in_progress",
	ICMAP_TRACK_ADD \| ICMAP_TRACK_MODIFY,
	main_logging_notify,
	NULL,
	&icmap_track);
	}
	#else
	static void add_logsys_config_notification(void)
	{
	cmap_track_handle_t cmap_track;

	cmap_track_add(cmap_handle, "logging.",
	CMAP_TRACK_ADD \| CMAP_TRACK_DELETE \| CMAP_TRACK_MODIFY \| CMAP_TRACK_PREFIX,
	main_logging_notify,
	NULL,
	&cmap_track);

	cmap_track_add(cmap_handle, "config.reload_in_progress",
	CMAP_TRACK_ADD \| CMAP_TRACK_MODIFY,
	main_logging_notify,
	NULL,
	&cmap_track);
	}
	#endif

	int corosync_log_config_read (
	#ifndef LOGCONFIG_USE_ICMAP
	cmap_handle_t cmap_h,
	const char *default_logfile,
	#endif
	const char **error_string)
	{
	const char *error_reason = error_string_response;

	#ifndef LOGCONFIG_USE_ICMAP
	if (!cmap_h) {
	error_reason = "No cmap handle";
	return (-1);
	}
	if (!default_logfile) {
	error_reason = "No default logfile";
	return (-1);
	}
	cmap_handle = cmap_h;
	main_logfile = default_logfile;
	#endif

	if (corosync_main_config_read_logging(error_string) < 0) {
	error_reason = *error_string;
	goto parse_error;
	}

	add_logsys_config_notification();

	return 0;

	parse_error:
	snprintf (error_string_response, sizeof(error_string_response),
	"parse error in config: %s.\n",
	error_reason);

	*error_string = error_string_response;
	return (-1);
	}

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