logger.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Asterisk Logger
 *
 * Logging routines
 *
 * \author Mark Spencer <markster@digium.com>
 */

/*! \li \ref logger.c uses the configuration file \ref logger.conf
 * \addtogroup configuration_file Configuration Files
 */

/*!
 * \page logger.conf logger.conf
 * \verbinclude logger.conf.sample
 */

/*** MODULEINFO
	<support_level>core</support_level>
 ***/

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

/* When we include logger.h again it will trample on some stuff in syslog.h, but
 * nothing we care about in here. */
#include <syslog.h>
#include <signal.h>
#include <time.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "asterisk/_private.h"
#include "asterisk/paths.h"	/* use ast_config_AST_LOG_DIR */
#include "asterisk/logger.h"
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/term.h"
#include "asterisk/cli.h"
#include "asterisk/utils.h"
#include "asterisk/manager.h"
#include "asterisk/astobj2.h"
#include "asterisk/threadstorage.h"
#include "asterisk/strings.h"
#include "asterisk/pbx.h"
#include "asterisk/app.h"
#include "asterisk/syslog.h"
#include "asterisk/buildinfo.h"
#include "asterisk/ast_version.h"
#include "asterisk/backtrace.h"

/*** DOCUMENTATION
 ***/

static char dateformat[256] = "%b %e %T";		/* Original Asterisk Format */

static char queue_log_name[256] = QUEUELOG;
static char exec_after_rotate[256] = "";

static int filesize_reload_needed;
static unsigned int global_logmask = 0xFFFF;
static int queuelog_init;
static int logger_initialized;
static volatile int next_unique_callid; /* Used to assign unique call_ids to calls */
static int display_callids;
static void unique_callid_cleanup(void *data);

static int logger_queue_size;
static int logger_queue_limit = 1000;
static int logger_messages_discarded;
static unsigned int high_water_alert;

struct ast_callid {
	int call_identifier; /* Numerical value of the call displayed in the logs */
};

AST_THREADSTORAGE_CUSTOM(unique_callid, NULL, unique_callid_cleanup);

static enum rotatestrategy {
	NONE = 0,                /* Do not rotate log files at all, instead rely on external mechanisms */
	SEQUENTIAL = 1 << 0,     /* Original method - create a new file, in order */
	ROTATE = 1 << 1,         /* Rotate all files, such that the oldest file has the highest suffix */
	TIMESTAMP = 1 << 2,      /* Append the epoch timestamp onto the end of the archived file */
} rotatestrategy = SEQUENTIAL;

static struct {
	unsigned int queue_log:1;
	unsigned int queue_log_to_file:1;
	unsigned int queue_adaptive_realtime:1;
	unsigned int queue_log_realtime_use_gmt:1;
} logfiles = { 1 };

static char hostname[MAXHOSTNAMELEN];
AST_THREADSTORAGE_RAW(in_safe_log);

enum logtypes {
	LOGTYPE_SYSLOG,
	LOGTYPE_FILE,
	LOGTYPE_CONSOLE,
};

struct logchannel {
	/*! What to log to this channel */
	unsigned int logmask;
	/*! If this channel is disabled or not */
	int disabled;
	/*! syslog facility */
	int facility;
	/*! Verbosity level. (-1 if use option_verbose for the level.) */
	int verbosity;
	/*! Type of log channel */
	enum logtypes type;
	/*! logfile logging file pointer */
	FILE *fileptr;
	/*! Filename */
	char filename[PATH_MAX];
	/*! field for linking to list */
	AST_LIST_ENTRY(logchannel) list;
	/*! Line number from configuration file */
	int lineno;
	/*! Whether this log channel was created dynamically */
	int dynamic;
	/*! Components (levels) from last config load */
	char components[0];
};

static AST_RWLIST_HEAD_STATIC(logchannels, logchannel);

enum logmsgtypes {
	LOGMSG_NORMAL = 0,
	LOGMSG_VERBOSE,
};

struct logmsg {
	enum logmsgtypes type;
	int level;
	int line;
	int lwp;
	struct ast_callid *callid;
	AST_DECLARE_STRING_FIELDS(
		AST_STRING_FIELD(date);
		AST_STRING_FIELD(file);
		AST_STRING_FIELD(function);
		AST_STRING_FIELD(message);
		AST_STRING_FIELD(level_name);
	);
	AST_LIST_ENTRY(logmsg) list;
};

static void logmsg_free(struct logmsg *msg)
{
	if (msg->callid) {
		ast_callid_unref(msg->callid);
	}
	ast_string_field_free_memory(msg);
	ast_free(msg);
}

static AST_LIST_HEAD_STATIC(logmsgs, logmsg);
static pthread_t logthread = AST_PTHREADT_NULL;
static ast_cond_t logcond;
static int close_logger_thread = 0;

static FILE *qlog;

/*! \brief Logging channels used in the Asterisk logging system
 *
 * The first 16 levels are reserved for system usage, and the remaining
 * levels are reserved for usage by dynamic levels registered via
 * ast_logger_register_level.
 */

/* Modifications to this array are protected by the rwlock in the
 * logchannels list.
 */

static char *levels[NUMLOGLEVELS] = {
	"DEBUG",
	"---EVENT---",		/* no longer used */
	"NOTICE",
	"WARNING",
	"ERROR",
	"VERBOSE",
	"DTMF",
};

/*! \brief Colors used in the console for logging */
static const int colors[NUMLOGLEVELS] = {
	COLOR_BRGREEN,
	COLOR_BRBLUE,		/* no longer used */
	COLOR_YELLOW,
	COLOR_BRRED,
	COLOR_RED,
	COLOR_GREEN,
	COLOR_BRGREEN,
	0,
	0,
	0,
	0,
	0,
	0,
	0,
	0,
	0,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
	COLOR_BRBLUE,
};

AST_THREADSTORAGE(verbose_buf);
AST_THREADSTORAGE(verbose_build_buf);
#define VERBOSE_BUF_INIT_SIZE   256

AST_THREADSTORAGE(log_buf);
#define LOG_BUF_INIT_SIZE       256

static void make_components(struct logchannel *chan)
{
	char *w;
	unsigned int logmask = 0;
	char *stringp = ast_strdupa(chan->components);
	unsigned int x;
	unsigned int verb_level;

	/* Default to using option_verbose as the verbosity level of the logging channel.  */
	verb_level = -1;

	while ((w = strsep(&stringp, ","))) {
		w = ast_strip(w);
		if (ast_strlen_zero(w)) {
			continue;
		}
		if (!strcmp(w, "*")) {
			logmask = 0xFFFFFFFF;
		} else if (!strncasecmp(w, "verbose(", 8)) {
			if (levels[__LOG_VERBOSE] && sscanf(w + 8, "%30u)", &verb_level) == 1) {
				logmask |= (1 << __LOG_VERBOSE);
			}
		} else {
			for (x = 0; x < ARRAY_LEN(levels); ++x) {
				if (levels[x] && !strcasecmp(w, levels[x])) {
					logmask |= (1 << x);
					break;
				}
			}
		}
	}
	if (chan->type == LOGTYPE_CONSOLE) {
		/*
		 * Force to use the root console verbose level so if the
		 * user specified any verbose level then it does not interfere
		 * with calculating the ast_verb_sys_level value.
		 */
		chan->verbosity = -1;
	} else {
		chan->verbosity = verb_level;
	}
	chan->logmask = logmask;
}

/*!
 * \brief create the filename that will be used for a logger channel.
 *
 * \param channel The name of the logger channel
 * \param[out] filename The filename for the logger channel
 * \param size The size of the filename buffer
 */
static void make_filename(const char *channel, char *filename, size_t size)
{
	const char *log_dir_prefix = "";
	const char *log_dir_separator = "";

	*filename = '\0';

	if (!strcasecmp(channel, "console")) {
		return;
	}

	if (!strncasecmp(channel, "syslog", 6)) {
		ast_copy_string(filename, channel, size);
		return;
	}

	/* It's a filename */

	if (channel[0] != '/') {
		log_dir_prefix = ast_config_AST_LOG_DIR;
		log_dir_separator = "/";
	}

	if (!ast_strlen_zero(hostname)) {
		snprintf(filename, size, "%s%s%s.%s",
			log_dir_prefix, log_dir_separator, channel, hostname);
	} else {
		snprintf(filename, size, "%s%s%s",
			log_dir_prefix, log_dir_separator, channel);
	}
}

/*!
 * \brief Find a particular logger channel by name
 *
 * \pre logchannels list is locked
 *
 * \param channel The name of the logger channel to find
 * \retval non-NULL The corresponding logger channel
 * \retval NULL Unable to find a logger channel with that particular name
 */
static struct logchannel *find_logchannel(const char *channel)
{
	char filename[PATH_MAX];
	struct logchannel *chan;

	make_filename(channel, filename, sizeof(filename));

	AST_RWLIST_TRAVERSE(&logchannels, chan, list) {
		if (!strcmp(chan->filename, filename)) {
			return chan;
		}
	}

	return NULL;
}

static struct logchannel *make_logchannel(const char *channel, const char *components, int lineno, int dynamic)
{
	struct logchannel *chan;
	char *facility;
	struct ast_tm tm;
	struct timeval now = ast_tvnow();
	char datestring[256];

	if (ast_strlen_zero(channel) || !(chan = ast_calloc(1, sizeof(*chan) + strlen(components) + 1)))
		return NULL;

	strcpy(chan->components, components);
	chan->lineno = lineno;
	chan->dynamic = dynamic;

	make_filename(channel, chan->filename, sizeof(chan->filename));

	if (!strcasecmp(channel, "console")) {
		chan->type = LOGTYPE_CONSOLE;
	} else if (!strncasecmp(channel, "syslog", 6)) {
		/*
		* syntax is:
		*  syslog.facility => level,level,level
		*/
		facility = strchr(channel, '.');
		if (!facility++ || !facility) {
			facility = "local0";
		}

		chan->facility = ast_syslog_facility(facility);

		if (chan->facility < 0) {
			fprintf(stderr, "Logger Warning: bad syslog facility in logger.conf\n");
			ast_free(chan);
			return NULL;
		}

		chan->type = LOGTYPE_SYSLOG;
		openlog("asterisk", LOG_PID, chan->facility);
	} else {
		if (!(chan->fileptr = fopen(chan->filename, "a"))) {
			/* Can't do real logging here since we're called with a lock
			 * so log to any attached consoles */
			ast_console_puts_mutable("ERROR: Unable to open log file '", __LOG_ERROR);
			ast_console_puts_mutable(chan->filename, __LOG_ERROR);
			ast_console_puts_mutable("': ", __LOG_ERROR);
			ast_console_puts_mutable(strerror(errno), __LOG_ERROR);
			ast_console_puts_mutable("'\n", __LOG_ERROR);
			ast_free(chan);
			return NULL;
		} else {
			/* Create our date/time */
			ast_localtime(&now, &tm, NULL);
			ast_strftime(datestring, sizeof(datestring), dateformat, &tm);

			fprintf(chan->fileptr, "[%s] Asterisk %s built by %s @ %s on a %s running %s on %s\n",
				datestring, ast_get_version(), ast_build_user, ast_build_hostname,
				ast_build_machine, ast_build_os, ast_build_date);
			fflush(chan->fileptr);
		}
		chan->type = LOGTYPE_FILE;
	}
	make_components(chan);

	return chan;
}

/* \brief Read config, setup channels.
 * \param locked The logchannels list is locked and this is a reload
 * \param altconf Alternate configuration file to read.
 *
 * \retval 0 Success
 * \retval -1 No config found or Failed
 */
static int init_logger_chain(int locked, const char *altconf)
{
	struct logchannel *chan;
	struct ast_config *cfg;
	struct ast_variable *var;
	const char *s;
	struct ast_flags config_flags = { 0 };

	if (!(cfg = ast_config_load2(S_OR(altconf, "logger.conf"), "logger", config_flags)) || cfg == CONFIG_STATUS_FILEINVALID) {
		cfg = NULL;
	}

	if (!locked) {
		AST_RWLIST_WRLOCK(&logchannels);
	}

	/* Set defaults */
	hostname[0] = '\0';
	display_callids = 1;
	memset(&logfiles, 0, sizeof(logfiles));
	logfiles.queue_log = 1;
	ast_copy_string(dateformat, "%b %e %T", sizeof(dateformat));
	ast_copy_string(queue_log_name, QUEUELOG, sizeof(queue_log_name));
	exec_after_rotate[0] = '\0';
	rotatestrategy = SEQUENTIAL;

	/* delete our list of log channels */
	while ((chan = AST_RWLIST_REMOVE_HEAD(&logchannels, list))) {
		ast_free(chan);
	}
	global_logmask = 0;
	if (!locked) {
		AST_RWLIST_UNLOCK(&logchannels);
	}

	errno = 0;
	/* close syslog */
	closelog();

	/* If no config file, we're fine, set default options. */
	if (!cfg) {
		if (!(chan = ast_calloc(1, sizeof(*chan) + 1))) {
			fprintf(stderr, "Failed to initialize default logging\n");
			return -1;
		}
		chan->type = LOGTYPE_CONSOLE;
		chan->logmask = (1 << __LOG_WARNING) | (1 << __LOG_NOTICE) | (1 << __LOG_ERROR);

		if (!locked) {
			AST_RWLIST_WRLOCK(&logchannels);
		}
		AST_RWLIST_INSERT_HEAD(&logchannels, chan, list);
		global_logmask |= chan->logmask;
		if (!locked) {
			AST_RWLIST_UNLOCK(&logchannels);
		}

		return -1;
	}

	if ((s = ast_variable_retrieve(cfg, "general", "appendhostname"))) {
		if (ast_true(s)) {
			if (gethostname(hostname, sizeof(hostname) - 1)) {
				ast_copy_string(hostname, "unknown", sizeof(hostname));
				fprintf(stderr, "What box has no hostname???\n");
			}
		}
	}
	if ((s = ast_variable_retrieve(cfg, "general", "display_callids"))) {
		display_callids = ast_true(s);
	}
	if ((s = ast_variable_retrieve(cfg, "general", "dateformat"))) {
		ast_copy_string(dateformat, s, sizeof(dateformat));
	}
	if ((s = ast_variable_retrieve(cfg, "general", "queue_log"))) {
		logfiles.queue_log = ast_true(s);
	}
	if ((s = ast_variable_retrieve(cfg, "general", "queue_log_to_file"))) {
		logfiles.queue_log_to_file = ast_true(s);
	}
	if ((s = ast_variable_retrieve(cfg, "general", "queue_log_name"))) {
		ast_copy_string(queue_log_name, s, sizeof(queue_log_name));
	}
	if ((s = ast_variable_retrieve(cfg, "general", "queue_log_realtime_use_gmt"))) {
		logfiles.queue_log_realtime_use_gmt = ast_true(s);
	}
	if ((s = ast_variable_retrieve(cfg, "general", "exec_after_rotate"))) {
		ast_copy_string(exec_after_rotate, s, sizeof(exec_after_rotate));
	}
	if ((s = ast_variable_retrieve(cfg, "general", "rotatestrategy"))) {
		if (strcasecmp(s, "timestamp") == 0) {
			rotatestrategy = TIMESTAMP;
		} else if (strcasecmp(s, "rotate") == 0) {
			rotatestrategy = ROTATE;
		} else if (strcasecmp(s, "sequential") == 0) {
			rotatestrategy = SEQUENTIAL;
		} else if (strcasecmp(s, "none") == 0) {
			rotatestrategy = NONE;
		} else {
			fprintf(stderr, "Unknown rotatestrategy: %s\n", s);
		}
	} else {
		if ((s = ast_variable_retrieve(cfg, "general", "rotatetimestamp"))) {
			rotatestrategy = ast_true(s) ? TIMESTAMP : SEQUENTIAL;
			fprintf(stderr, "rotatetimestamp option has been deprecated.  Please use rotatestrategy instead.\n");
		}
	}
	if ((s = ast_variable_retrieve(cfg, "general", "logger_queue_limit"))) {
		if (sscanf(s, "%30d", &logger_queue_limit) != 1) {
			fprintf(stderr, "logger_queue_limit has an invalid value.  Leaving at default of %d.\n",
				logger_queue_limit);
		}
		if (logger_queue_limit < 10) {
			fprintf(stderr, "logger_queue_limit must be >= 10. Setting to 10.\n");
			logger_queue_limit = 10;
		}
	}

	if (!locked) {
		AST_RWLIST_WRLOCK(&logchannels);
	}
	var = ast_variable_browse(cfg, "logfiles");
	for (; var; var = var->next) {
		if (!(chan = make_logchannel(var->name, var->value, var->lineno, 0))) {
			/* Print error message directly to the consoles since the lock is held
			 * and we don't want to unlock with the list partially built */
			ast_console_puts_mutable("ERROR: Unable to create log channel '", __LOG_ERROR);
			ast_console_puts_mutable(var->name, __LOG_ERROR);
			ast_console_puts_mutable("'\n", __LOG_ERROR);
			continue;
		}
		AST_RWLIST_INSERT_HEAD(&logchannels, chan, list);
		global_logmask |= chan->logmask;
	}

	if (qlog) {
		fclose(qlog);
		qlog = NULL;
	}

	if (!locked) {
		AST_RWLIST_UNLOCK(&logchannels);
	}

	ast_config_destroy(cfg);

	return 0;
}

void ast_child_verbose(int level, const char *fmt, ...)
{
	char *msg = NULL, *emsg = NULL, *sptr, *eptr;
	va_list ap, aq;
	int size;

	va_start(ap, fmt);
	va_copy(aq, ap);
	if ((size = vsnprintf(msg, 0, fmt, ap)) < 0) {
		va_end(ap);
		va_end(aq);
		return;
	}
	va_end(ap);

	if (!(msg = ast_malloc(size + 1))) {
		va_end(aq);
		return;
	}

	vsnprintf(msg, size + 1, fmt, aq);
	va_end(aq);

	if (!(emsg = ast_malloc(size * 2 + 1))) {
		ast_free(msg);
		return;
	}

	for (sptr = msg, eptr = emsg; ; sptr++) {
		if (*sptr == '"') {
			*eptr++ = '\\';
		}
		*eptr++ = *sptr;
		if (*sptr == '\0') {
			break;
		}
	}
	ast_free(msg);

	fprintf(stdout, "verbose \"%s\" %d\n", emsg, level);
	fflush(stdout);
	ast_free(emsg);
}

void ast_queue_log(const char *queuename, const char *callid, const char *agent, const char *event, const char *fmt, ...)
{
	va_list ap;
	struct timeval tv;
	struct ast_tm tm;
	char qlog_msg[8192];
	int qlog_len;
	char time_str[30];

	if (!logger_initialized) {
		/* You are too early.  We are not open yet! */
		return;
	}
	if (!queuelog_init) {
		/* We must initialize now since someone is trying to log something. */
		logger_queue_start();
	}

	if (ast_check_realtime("queue_log")) {
		tv = ast_tvnow();
		ast_localtime(&tv, &tm, logfiles.queue_log_realtime_use_gmt ? "GMT" : NULL);
		ast_strftime(time_str, sizeof(time_str), "%F %T.%6q", &tm);
		va_start(ap, fmt);
		vsnprintf(qlog_msg, sizeof(qlog_msg), fmt, ap);
		va_end(ap);
		if (logfiles.queue_adaptive_realtime) {
			AST_DECLARE_APP_ARGS(args,
				AST_APP_ARG(data)[5];
			);
			AST_NONSTANDARD_APP_ARGS(args, qlog_msg, '|');
			/* Ensure fields are large enough to receive data */
			ast_realtime_require_field("queue_log",
				"data1", RQ_CHAR, strlen(S_OR(args.data[0], "")),
				"data2", RQ_CHAR, strlen(S_OR(args.data[1], "")),
				"data3", RQ_CHAR, strlen(S_OR(args.data[2], "")),
				"data4", RQ_CHAR, strlen(S_OR(args.data[3], "")),
				"data5", RQ_CHAR, strlen(S_OR(args.data[4], "")),
				SENTINEL);

			/* Store the log */
			ast_store_realtime("queue_log", "time", time_str,
				"callid", callid,
				"queuename", queuename,
				"agent", agent,
				"event", event,
				"data1", S_OR(args.data[0], ""),
				"data2", S_OR(args.data[1], ""),
				"data3", S_OR(args.data[2], ""),
				"data4", S_OR(args.data[3], ""),
				"data5", S_OR(args.data[4], ""),
				SENTINEL);
		} else {
			ast_store_realtime("queue_log", "time", time_str,
				"callid", callid,
				"queuename", queuename,
				"agent", agent,
				"event", event,
				"data", qlog_msg,
				SENTINEL);
		}

		if (!logfiles.queue_log_to_file) {
			return;
		}
	}

	if (qlog) {
		va_start(ap, fmt);
		qlog_len = snprintf(qlog_msg, sizeof(qlog_msg), "%ld|%s|%s|%s|%s|", (long)time(NULL), callid, queuename, agent, event);
		vsnprintf(qlog_msg + qlog_len, sizeof(qlog_msg) - qlog_len, fmt, ap);
		va_end(ap);
		AST_RWLIST_RDLOCK(&logchannels);
		if (qlog) {
			fprintf(qlog, "%s\n", qlog_msg);
			fflush(qlog);
		}
		AST_RWLIST_UNLOCK(&logchannels);
	}
}

static int rotate_file(const char *filename)
{
	char old[PATH_MAX];
	char new[PATH_MAX];
	int x, y, which, found, res = 0, fd;
	char *suffixes[4] = { "", ".gz", ".bz2", ".Z" };

	switch (rotatestrategy) {
	case NONE:
		/* No rotation */
		break;
	case SEQUENTIAL:
		for (x = 0; ; x++) {
			snprintf(new, sizeof(new), "%s.%d", filename, x);
			fd = open(new, O_RDONLY);
			if (fd > -1)
				close(fd);
			else
				break;
		}
		if (rename(filename, new)) {
			fprintf(stderr, "Unable to rename file '%s' to '%s'\n", filename, new);
			res = -1;
		} else {
			filename = new;
		}
		break;
	case TIMESTAMP:
		snprintf(new, sizeof(new), "%s.%ld", filename, (long)time(NULL));
		if (rename(filename, new)) {
			fprintf(stderr, "Unable to rename file '%s' to '%s'\n", filename, new);
			res = -1;
		} else {
			filename = new;
		}
		break;
	case ROTATE:
		/* Find the next empty slot, including a possible suffix */
		for (x = 0; ; x++) {
			found = 0;
			for (which = 0; which < ARRAY_LEN(suffixes); which++) {
				snprintf(new, sizeof(new), "%s.%d%s", filename, x, suffixes[which]);
				fd = open(new, O_RDONLY);
				if (fd > -1) {
					close(fd);
					found = 1;
					break;
				}
			}
			if (!found) {
				break;
			}
		}

		/* Found an empty slot */
		for (y = x; y > 0; y--) {
			for (which = 0; which < ARRAY_LEN(suffixes); which++) {
				snprintf(old, sizeof(old), "%s.%d%s", filename, y - 1, suffixes[which]);
				fd = open(old, O_RDONLY);
				if (fd > -1) {
					/* Found the right suffix */
					close(fd);
					snprintf(new, sizeof(new), "%s.%d%s", filename, y, suffixes[which]);
					if (rename(old, new)) {
						fprintf(stderr, "Unable to rename file '%s' to '%s'\n", old, new);
						res = -1;
					}
					break;
				}
			}
		}

		/* Finally, rename the current file */
		snprintf(new, sizeof(new), "%s.0", filename);
		if (rename(filename, new)) {
			fprintf(stderr, "Unable to rename file '%s' to '%s'\n", filename, new);
			res = -1;
		} else {
			filename = new;
		}
	}

	if (!ast_strlen_zero(exec_after_rotate)) {
		struct ast_channel *c = ast_dummy_channel_alloc();
		char buf[512];

		pbx_builtin_setvar_helper(c, "filename", filename);
		pbx_substitute_variables_helper(c, exec_after_rotate, buf, sizeof(buf));
		if (c) {
			c = ast_channel_unref(c);
		}
		if (ast_safe_system(buf) == -1) {
			ast_log(LOG_WARNING, "error executing '%s'\n", buf);
		}
	}
	return res;
}

/*!
 * \internal
 * \brief Start the realtime queue logging if configured.
 *
 * \retval TRUE if not to open queue log file.
 */
static int logger_queue_rt_start(void)
{
	if (ast_check_realtime("queue_log")) {
		if (!ast_realtime_require_field("queue_log",
			"time", RQ_DATETIME, 26,
			"data1", RQ_CHAR, 20,
			"data2", RQ_CHAR, 20,
			"data3", RQ_CHAR, 20,
			"data4", RQ_CHAR, 20,
			"data5", RQ_CHAR, 20,
			SENTINEL)) {
			logfiles.queue_adaptive_realtime = 1;
		} else {
			logfiles.queue_adaptive_realtime = 0;
		}

		if (!logfiles.queue_log_to_file) {
			/* Don't open the log file. */
			return 1;
		}
	}
	return 0;
}

/*!
 * \internal
 * \brief Rotate the queue log file and restart.
 *
 * \param queue_rotate Log queue rotation mode.
 *
 * \note Assumes logchannels is write locked on entry.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int logger_queue_restart(int queue_rotate)
{
	int res = 0;
	char qfname[PATH_MAX];

	if (logger_queue_rt_start()) {
		return res;
	}

	snprintf(qfname, sizeof(qfname), "%s/%s", ast_config_AST_LOG_DIR, queue_log_name);
	if (qlog) {
		/* Just in case it was still open. */
		fclose(qlog);
		qlog = NULL;
	}
	if (queue_rotate) {
		rotate_file(qfname);
	}

	/* Open the log file. */
	qlog = fopen(qfname, "a");
	if (!qlog) {
		ast_log(LOG_ERROR, "Unable to create queue log: %s\n", strerror(errno));
		res = -1;
	}
	return res;
}

static int reload_logger(int rotate, const char *altconf)
{
	int queue_rotate = rotate;
	struct logchannel *f;
	int res = 0;

	AST_RWLIST_WRLOCK(&logchannels);

	if (qlog) {
		if (rotate < 0) {
			/* Check filesize - this one typically doesn't need an auto-rotate */
			if (ftello(qlog) > 0x40000000) { /* Arbitrarily, 1 GB */
				fclose(qlog);
				qlog = NULL;
			} else {
				queue_rotate = 0;
			}
		} else {
			fclose(qlog);
			qlog = NULL;
		}
	} else {
		queue_rotate = 0;
	}

	ast_mkdir(ast_config_AST_LOG_DIR, 0777);

	AST_RWLIST_TRAVERSE(&logchannels, f, list) {
		if (f->disabled) {
			f->disabled = 0;	/* Re-enable logging at reload */
			/*** DOCUMENTATION
				<managerEventInstance>
					<synopsis>Raised when a logging channel is re-enabled after a reload operation.</synopsis>
					<syntax>
						<parameter name="Channel">
							<para>The name of the logging channel.</para>
						</parameter>
					</syntax>
				</managerEventInstance>
			***/
			manager_event(EVENT_FLAG_SYSTEM, "LogChannel", "Channel: %s\r\nEnabled: Yes\r\n", f->filename);
		}
		if (f->fileptr && (f->fileptr != stdout) && (f->fileptr != stderr)) {
			int rotate_this = 0;
			if (rotatestrategy != NONE && ftello(f->fileptr) > 0x40000000) { /* Arbitrarily, 1 GB */
				/* Be more proactive about rotating massive log files */
				rotate_this = 1;
			}
			fclose(f->fileptr);	/* Close file */
			f->fileptr = NULL;
			if (rotate || rotate_this) {
				rotate_file(f->filename);
			}
		}
	}

	filesize_reload_needed = 0;

	init_logger_chain(1 /* locked */, altconf);

	ast_unload_realtime("queue_log");
	if (logfiles.queue_log) {
		res = logger_queue_restart(queue_rotate);
		AST_RWLIST_UNLOCK(&logchannels);
		ast_verb_update();
		ast_queue_log("NONE", "NONE", "NONE", "CONFIGRELOAD", "%s", "");
		ast_verb(1, "Asterisk Queue Logger restarted\n");
	} else {
		AST_RWLIST_UNLOCK(&logchannels);
		ast_verb_update();
	}

	return res;
}

/*! \brief Reload the logger module without rotating log files (also used from loader.c during
	a full Asterisk reload) */
int logger_reload(void)
{
	if (reload_logger(0, NULL)) {
		return RESULT_FAILURE;
	}
	return RESULT_SUCCESS;
}

static char *handle_logger_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	switch (cmd) {
	case CLI_INIT:
		e->command = "logger reload";
		e->usage =
			"Usage: logger reload [<alt-conf>]\n"
			"       Reloads the logger subsystem state.  Use after restarting syslogd(8) if you are using syslog logging.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}
	if (reload_logger(0, a->argc == 3 ? a->argv[2] : NULL)) {
		ast_cli(a->fd, "Failed to reload the logger\n");
		return CLI_FAILURE;
	}
	return CLI_SUCCESS;
}

static char *handle_logger_rotate(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	switch (cmd) {
	case CLI_INIT:
		e->command = "logger rotate";
		e->usage =
			"Usage: logger rotate\n"
			"       Rotates and Reopens the log files.\n";
		return NULL;
	case CLI_GENERATE:
		return NULL;
	}
	if (reload_logger(1, NULL)) {
		ast_cli(a->fd, "Failed to reload the logger and rotate log files\n");
		return CLI_FAILURE;
	}
	return CLI_SUCCESS;
}

int ast_logger_rotate()
{
	return reload_logger(1, NULL);
}