aboutsummaryrefslogtreecommitdiffstats
path: root/src/LogInit.cxx
blob: 0b781da236e088ce8573bcf7e61c91980f31a737 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/*
 * 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;
}