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/*
* Copyright 2003-2020 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 "config/Param.hxx"
#include "config/Data.hxx"
#include "config/Option.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/FileSystem.hxx"
#include "util/Domain.hxx"
#include "util/RuntimeError.hxx"
#include "system/Error.hxx"
#include <cassert>
#ifdef ENABLE_SYSTEMD_DAEMON
#include <systemd/sd-daemon.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <stdio.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)
[[maybe_unused]]
static constexpr Domain log_domain("log");
#ifndef ANDROID
static int out_fd = -1;
static AllocatedPath out_path = nullptr;
static void redirect_logs(int fd)
{
assert(fd >= 0);
if (dup2(fd, STDOUT_FILENO) < 0)
throw MakeErrno("Failed to dup2 stdout");
if (dup2(fd, STDERR_FILENO) < 0)
throw MakeErrno("Failed to dup2 stderr");
}
static int
open_log_file()
{
assert(!out_path.IsNull());
return OpenFile(out_path, O_CREAT | O_WRONLY | O_APPEND, 0666).Steal();
}
static void
log_init_file(int line)
{
assert(!out_path.IsNull());
out_fd = open_log_file();
if (out_fd < 0) {
#ifdef _WIN32
const std::string out_path_utf8 = out_path.ToUTF8();
throw FormatRuntimeError("failed to open log file \"%s\" (config line %d)",
out_path_utf8.c_str(), line);
#else
int e = errno;
const std::string out_path_utf8 = out_path.ToUTF8();
throw FormatErrno(e, "failed to open log file \"%s\" (config line %d)",
out_path_utf8.c_str(), line);
#endif
}
EnableLogTimestamp();
}
static inline LogLevel
parse_log_level(const char *value)
{
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
throw FormatRuntimeError("unknown log level \"%s\"", value);
}
#endif
void
log_early_init(bool verbose) noexcept
{
#ifdef ANDROID
(void)verbose;
#else
/* force stderr to be line-buffered */
setvbuf(stderr, nullptr, _IOLBF, 0);
if (verbose)
SetLogThreshold(LogLevel::DEBUG);
#endif
}
void
log_init(const ConfigData &config, bool verbose, bool use_stdout)
{
#ifdef ANDROID
(void)config;
(void)verbose;
(void)use_stdout;
#else
if (verbose)
SetLogThreshold(LogLevel::DEBUG);
else
SetLogThreshold(config.With(ConfigOption::LOG_LEVEL, [](const char *s){
return s != nullptr
? parse_log_level(s)
: LogLevel::DEFAULT;
}));
if (use_stdout) {
out_fd = STDOUT_FILENO;
} else {
const auto *param = config.GetParam(ConfigOption::LOG_FILE);
if (param == nullptr) {
/* no configuration: default to syslog (if
available) */
#ifdef ENABLE_SYSTEMD_DAEMON
if (sd_booted() &&
getenv("NOTIFY_SOCKET") != nullptr) {
/* if MPD was started as a systemd
service, default to journal (which
is connected to fd=2) */
out_fd = STDOUT_FILENO;
return;
}
#endif
#ifndef HAVE_SYSLOG
throw std::runtime_error("config parameter 'log_file' not found");
#endif
#ifdef HAVE_SYSLOG
} else if (strcmp(param->value.c_str(), "syslog") == 0) {
LogInitSysLog();
#endif
} else {
out_path = param->GetPath();
log_init_file(param->line);
}
}
#endif
}
#ifndef ANDROID
static void
close_log_files() noexcept
{
#ifdef HAVE_SYSLOG
LogFinishSysLog();
#endif
}
#endif
void
log_deinit() noexcept
{
#ifndef ANDROID
close_log_files();
out_path = nullptr;
#endif
}
void setup_log_output()
{
#ifndef ANDROID
if (out_fd == STDOUT_FILENO)
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;
#endif
}
int
cycle_log_files() noexcept
{
#ifdef ANDROID
return 0;
#else
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);
close(fd);
FormatDebug(log_domain, "Done cycling log files");
return 0;
#endif
}
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