/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "log.h" #include "conf.h" #include "utils.h" #include "config.h" #include <assert.h> #include <sys/types.h> #include <sys/stat.h> #include <string.h> #include <stdarg.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <unistd.h> #include <errno.h> #include <glib.h> #ifdef HAVE_SYSLOG #include <syslog.h> #endif #define LOG_LEVEL_SECURE G_LOG_LEVEL_INFO #define LOG_DATE_BUF_SIZE 16 #define LOG_DATE_LEN (LOG_DATE_BUF_SIZE - 1) static GLogLevelFlags log_threshold = G_LOG_LEVEL_MESSAGE; static const char *log_charset; static bool stdout_mode = true; static int out_fd; static const char *out_filename; static void redirect_logs(int fd) { assert(fd >= 0); if (dup2(fd, STDOUT_FILENO) < 0) g_error("problems dup2 stdout : %s\n", strerror(errno)); if (dup2(fd, STDERR_FILENO) < 0) g_error("problems dup2 stderr : %s\n", strerror(errno)); } static const char *log_date(void) { static char buf[LOG_DATE_BUF_SIZE]; time_t t = time(NULL); strftime(buf, LOG_DATE_BUF_SIZE, "%b %d %H:%M : ", localtime(&t)); return buf; } /** * Determines the length of the string excluding trailing whitespace * characters. */ static int chomp_length(const char *p) { size_t length = strlen(p); while (length > 0 && g_ascii_isspace(p[length - 1])) --length; return (int)length; } static void file_log_func(const gchar *log_domain, G_GNUC_UNUSED GLogLevelFlags log_level, const gchar *message, G_GNUC_UNUSED gpointer user_data) { char *converted; if (log_level > log_threshold) return; if (log_charset != NULL) { converted = g_convert_with_fallback(message, -1, log_charset, "utf-8", NULL, NULL, NULL, NULL); if (converted != NULL) message = converted; } else converted = NULL; if (log_domain == NULL) log_domain = ""; fprintf(stderr, "%s%s%s%.*s\n", stdout_mode ? "" : log_date(), log_domain, *log_domain == 0 ? "" : ": ", chomp_length(message), message); g_free(converted); } static void log_init_stdout(void) { g_log_set_default_handler(file_log_func, NULL); } static int open_log_file(void) { assert(out_filename != NULL); return open(out_filename, O_CREAT | O_WRONLY | O_APPEND, 0666); } static void log_init_file(const char *path, unsigned line) { out_filename = path; out_fd = open_log_file(); if (out_fd < 0) g_error("problem opening log file \"%s\" (config line %u) for " "writing\n", path, line); g_log_set_default_handler(file_log_func, NULL); } #ifdef HAVE_SYSLOG static int glib_to_syslog_level(GLogLevelFlags log_level) { switch (log_level & G_LOG_LEVEL_MASK) { case G_LOG_LEVEL_ERROR: case G_LOG_LEVEL_CRITICAL: return LOG_ERR; case G_LOG_LEVEL_WARNING: return LOG_WARNING; case G_LOG_LEVEL_MESSAGE: return LOG_NOTICE; case G_LOG_LEVEL_INFO: return LOG_INFO; case G_LOG_LEVEL_DEBUG: return LOG_DEBUG; default: return LOG_NOTICE; } } static void syslog_log_func(const gchar *log_domain, GLogLevelFlags log_level, const gchar *message, G_GNUC_UNUSED gpointer user_data) { if (stdout_mode) { /* fall back to the file log function during startup */ file_log_func(log_domain, log_level, message, user_data); return; } if (log_level > log_threshold) return; if (log_domain == NULL) log_domain = ""; syslog(glib_to_syslog_level(log_level), "%s%s%.*s", log_domain, *log_domain == 0 ? "" : ": ", chomp_length(message), message); } static void log_init_syslog(void) { assert(out_filename == NULL); openlog(PACKAGE, 0, LOG_DAEMON); g_log_set_default_handler(syslog_log_func, NULL); } #endif static inline GLogLevelFlags parse_log_level(const char *value, unsigned line) { if (0 == strcmp(value, "default")) return G_LOG_LEVEL_MESSAGE; if (0 == strcmp(value, "secure")) return LOG_LEVEL_SECURE; else if (0 == strcmp(value, "verbose")) return G_LOG_LEVEL_DEBUG; else g_error("unknown log level \"%s\" at line %u\n", value, line); } void log_init(bool verbose, bool use_stdout) { ConfigParam *param; g_get_charset(&log_charset); if (verbose) log_threshold = G_LOG_LEVEL_DEBUG; else if ((param = getConfigParam(CONF_LOG_LEVEL)) != NULL) log_threshold = parse_log_level(param->value, param->line); if (use_stdout) { log_init_stdout(); } else { param = getConfigParam(CONF_LOG_FILE); if (param == NULL) { #ifdef HAVE_SYSLOG /* no configuration: default to syslog (if available) */ log_init_syslog(); #else g_error("config parameter \"%s\" not found\n", CONF_LOG_FILE); #endif #ifdef HAVE_SYSLOG } else if (strcmp(param->value, "syslog") == 0) { log_init_syslog(); #endif } else { char *path = parsePath(param->value); g_free(param->value); if (path == NULL) g_error("error parsing \"%s\" at line %i\n", CONF_LOG_FILE, param->line); param->value = path; log_init_file(param->value, param->line); } } } void setup_log_output(bool use_stdout) { fflush(NULL); if (!use_stdout) { if (out_filename != NULL) { redirect_logs(out_fd); close(out_fd); } stdout_mode = false; log_charset = NULL; } } #define log_func(func,level) \ G_GNUC_PRINTF(1, 2) void func(const char *fmt, ...) \ { \ if (level <= log_threshold) { \ va_list args; \ va_start(args, fmt); \ g_logv(NULL, level, fmt, args); \ va_end(args); \ } \ } log_func(DEBUG, G_LOG_LEVEL_DEBUG) #undef log_func G_GNUC_PRINTF(1, 2) G_GNUC_NORETURN void FATAL(const char *fmt, ...) { va_list args; va_start(args, fmt); g_logv(NULL, G_LOG_LEVEL_ERROR, fmt, args); va_end(args); exit(EXIT_FAILURE); } int cycle_log_files(void) { int fd; if (stdout_mode || out_filename == NULL) return 0; assert(out_filename); g_debug("Cycling log files...\n"); close_log_files(); fd = open_log_file(); if (fd < 0) { g_warning("error re-opening log file: %s\n", out_filename); return -1; } redirect_logs(fd); g_debug("Done cycling log files\n"); return 0; } void close_log_files(void) { if (stdout_mode) return; #ifdef HAVE_SYSLOG if (out_filename == NULL) closelog(); #endif }