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/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "LogInit.hxx"
#include "LogBackend.hxx"
#include "Log.hxx"
#include "ConfigData.hxx"
#include "ConfigGlobal.hxx"
#include "ConfigOption.hxx"
#include "system/FatalError.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/FileSystem.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "system/FatalError.hxx"
#ifdef HAVE_GLIB
#include <glib.h>
#endif
#include <assert.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#define LOG_LEVEL_SECURE LogLevel::INFO
#define LOG_DATE_BUF_SIZE 16
#define LOG_DATE_LEN (LOG_DATE_BUF_SIZE - 1)
static constexpr Domain log_domain("log");
static int out_fd;
static AllocatedPath out_path = AllocatedPath::Null();
static void redirect_logs(int fd)
{
assert(fd >= 0);
if (dup2(fd, STDOUT_FILENO) < 0)
FatalSystemError("Failed to dup2 stdout");
if (dup2(fd, STDERR_FILENO) < 0)
FatalSystemError("Failed to dup2 stderr");
}
static int
open_log_file(void)
{
assert(!out_path.IsNull());
return OpenFile(out_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
}
static bool
log_init_file(unsigned line, Error &error)
{
assert(!out_path.IsNull());
out_fd = open_log_file();
if (out_fd < 0) {
const std::string out_path_utf8 = out_path.ToUTF8();
error.FormatErrno("failed to open log file \"%s\" (config line %u)",
out_path_utf8.c_str(), line);
return false;
}
EnableLogTimestamp();
return true;
}
static inline LogLevel
parse_log_level(const char *value, unsigned line)
{
if (0 == strcmp(value, "default"))
return LogLevel::DEFAULT;
if (0 == strcmp(value, "secure"))
return LOG_LEVEL_SECURE;
else if (0 == strcmp(value, "verbose"))
return LogLevel::DEBUG;
else {
FormatFatalError("unknown log level \"%s\" at line %u",
value, line);
}
}
void
log_early_init(bool verbose)
{
if (verbose)
SetLogThreshold(LogLevel::DEBUG);
}
bool
log_init(bool verbose, bool use_stdout, Error &error)
{
const struct config_param *param;
#ifdef HAVE_GLIB
const char *charset;
g_get_charset(&charset);
SetLogCharset(charset);
#endif
if (verbose)
SetLogThreshold(LogLevel::DEBUG);
else if ((param = config_get_param(CONF_LOG_LEVEL)) != nullptr)
SetLogThreshold(parse_log_level(param->value.c_str(),
param->line));
if (use_stdout) {
return true;
} else {
param = config_get_param(CONF_LOG_FILE);
if (param == nullptr) {
#ifdef HAVE_SYSLOG
/* no configuration: default to syslog (if
available) */
LogInitSysLog();
return true;
#else
error.Set(log_domain,
"config parameter 'log_file' not found");
return false;
#endif
#ifdef HAVE_SYSLOG
} else if (strcmp(param->value.c_str(), "syslog") == 0) {
LogInitSysLog();
return true;
#endif
} else {
out_path = config_get_path(CONF_LOG_FILE, error);
return !out_path.IsNull() &&
log_init_file(param->line, error);
}
}
}
static void
close_log_files(void)
{
#ifdef HAVE_SYSLOG
LogFinishSysLog();
#endif
}
void
log_deinit(void)
{
close_log_files();
out_path = AllocatedPath::Null();
}
void setup_log_output(bool use_stdout)
{
if (use_stdout)
return;
fflush(nullptr);
if (out_fd < 0) {
#ifdef WIN32
return;
#else
out_fd = open("/dev/null", O_WRONLY);
if (out_fd < 0)
return;
#endif
}
redirect_logs(out_fd);
close(out_fd);
out_fd = -1;
SetLogCharset(nullptr);
}
int cycle_log_files(void)
{
int fd;
if (out_path.IsNull())
return 0;
FormatDebug(log_domain, "Cycling log files");
close_log_files();
fd = open_log_file();
if (fd < 0) {
const std::string out_path_utf8 = out_path.ToUTF8();
FormatError(log_domain,
"error re-opening log file: %s",
out_path_utf8.c_str());
return -1;
}
redirect_logs(fd);
FormatDebug(log_domain, "Done cycling log files");
return 0;
}
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