diff options
Diffstat (limited to 'logging.c')
| -rw-r--r-- | logging.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/logging.c b/logging.c new file mode 100644 index 0000000..d858d2a --- /dev/null +++ b/logging.c @@ -0,0 +1,352 @@ +/* + chronyd/chronyc - Programs for keeping computer clocks accurate. + + ********************************************************************** + * Copyright (C) Richard P. Curnow 1997-2003 + * Copyright (C) Miroslav Lichvar 2011-2014, 2018-2020 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * 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. + * + ********************************************************************** + + ======================================================================= + + Module to handle logging of diagnostic information + */ + +#include "config.h" + +#include "sysincl.h" + +#include <syslog.h> + +#include "conf.h" +#include "logging.h" +#include "memory.h" +#include "util.h" + +/* This is used by DEBUG_LOG macro */ +LOG_Severity log_min_severity = LOGS_INFO; + +/* ================================================== */ +/* Flag indicating we have initialised */ +static int initialised = 0; + +static FILE *file_log = NULL; +static int system_log = 0; + +static int parent_fd = 0; + +struct LogFile { + const char *name; + const char *banner; + FILE *file; + unsigned long writes; +}; + +static int n_filelogs = 0; + +/* Increase this when adding a new logfile */ +#define MAX_FILELOGS 6 + +static struct LogFile logfiles[MAX_FILELOGS]; + +/* Global prefix for debug messages */ +static char *debug_prefix; + +/* ================================================== */ +/* Init function */ + +void +LOG_Initialise(void) +{ + debug_prefix = Strdup(""); + initialised = 1; + LOG_OpenFileLog(NULL); +} + +/* ================================================== */ +/* Fini function */ + +void +LOG_Finalise(void) +{ + if (system_log) + closelog(); + + if (file_log) + fclose(file_log); + + LOG_CycleLogFiles(); + + Free(debug_prefix); + + initialised = 0; +} + +/* ================================================== */ + +static void log_message(int fatal, LOG_Severity severity, const char *message) +{ + if (system_log) { + int priority; + switch (severity) { + case LOGS_DEBUG: + priority = LOG_DEBUG; + break; + case LOGS_INFO: + priority = LOG_INFO; + break; + case LOGS_WARN: + priority = LOG_WARNING; + break; + case LOGS_ERR: + priority = LOG_ERR; + break; + case LOGS_FATAL: + priority = LOG_CRIT; + break; + default: + assert(0); + } + syslog(priority, fatal ? "Fatal error : %s" : "%s", message); + } else if (file_log) { + fprintf(file_log, fatal ? "Fatal error : %s\n" : "%s\n", message); + } +} + +/* ================================================== */ + +void LOG_Message(LOG_Severity severity, +#if DEBUG > 0 + int line_number, const char *filename, const char *function_name, +#endif + const char *format, ...) +{ + char buf[2048]; + va_list other_args; + time_t t; + struct tm *tm; + + assert(initialised); + + if (!system_log && file_log && severity >= log_min_severity) { + /* Don't clutter up syslog with timestamps and internal debugging info */ + time(&t); + tm = gmtime(&t); + if (tm) { + strftime(buf, sizeof (buf), "%Y-%m-%dT%H:%M:%SZ", tm); + fprintf(file_log, "%s ", buf); + } +#if DEBUG > 0 + if (log_min_severity <= LOGS_DEBUG) + fprintf(file_log, "%s%s:%d:(%s) ", debug_prefix, filename, line_number, function_name); +#endif + } + + va_start(other_args, format); + vsnprintf(buf, sizeof(buf), format, other_args); + va_end(other_args); + + switch (severity) { + case LOGS_DEBUG: + case LOGS_INFO: + case LOGS_WARN: + case LOGS_ERR: + if (severity >= log_min_severity) + log_message(0, severity, buf); + break; + case LOGS_FATAL: + if (severity >= log_min_severity) + log_message(1, severity, buf); + + /* Send the message also to the foreground process if it is + still running, or stderr if it is still open */ + if (parent_fd > 0) { + if (write(parent_fd, buf, strlen(buf) + 1) < 0) + ; /* Not much we can do here */ + } else if (system_log && parent_fd == 0) { + system_log = 0; + log_message(1, severity, buf); + } + exit(1); + break; + default: + assert(0); + } +} + +/* ================================================== */ + +void +LOG_OpenFileLog(const char *log_file) +{ + FILE *f; + + if (log_file) { + f = UTI_OpenFile(NULL, log_file, NULL, 'A', 0640); + } else { + f = stderr; + } + + /* Enable line buffering */ + setvbuf(f, NULL, _IOLBF, BUFSIZ); + + if (file_log && file_log != stderr) + fclose(file_log); + + file_log = f; +} + + +/* ================================================== */ + +void +LOG_OpenSystemLog(void) +{ + system_log = 1; + openlog("chronyd", LOG_PID, LOG_DAEMON); +} + +/* ================================================== */ + +void LOG_SetMinSeverity(LOG_Severity severity) +{ + /* Don't print any debug messages in a non-debug build */ + log_min_severity = CLAMP(DEBUG > 0 ? LOGS_DEBUG : LOGS_INFO, severity, LOGS_FATAL); +} + +/* ================================================== */ + +LOG_Severity +LOG_GetMinSeverity(void) +{ + return log_min_severity; +} + +/* ================================================== */ + +void +LOG_SetDebugPrefix(const char *prefix) +{ + Free(debug_prefix); + debug_prefix = Strdup(prefix); +} + +/* ================================================== */ + +void +LOG_SetParentFd(int fd) +{ + parent_fd = fd; + if (file_log == stderr) + file_log = NULL; +} + +/* ================================================== */ + +void +LOG_CloseParentFd() +{ + if (parent_fd > 0) + close(parent_fd); + parent_fd = -1; +} + +/* ================================================== */ + +LOG_FileID +LOG_FileOpen(const char *name, const char *banner) +{ + if (n_filelogs >= MAX_FILELOGS) { + assert(0); + return -1; + } + + logfiles[n_filelogs].name = name; + logfiles[n_filelogs].banner = banner; + logfiles[n_filelogs].file = NULL; + logfiles[n_filelogs].writes = 0; + + return n_filelogs++; +} + +/* ================================================== */ + +void +LOG_FileWrite(LOG_FileID id, const char *format, ...) +{ + va_list other_args; + int banner; + + if (id < 0 || id >= n_filelogs || !logfiles[id].name) + return; + + if (!logfiles[id].file) { + char *logdir = CNF_GetLogDir(); + + if (!logdir) { + LOG(LOGS_WARN, "logdir not specified"); + logfiles[id].name = NULL; + return; + } + + logfiles[id].file = UTI_OpenFile(logdir, logfiles[id].name, ".log", 'a', 0644); + if (!logfiles[id].file) { + /* Disable the log */ + logfiles[id].name = NULL; + return; + } + } + + banner = CNF_GetLogBanner(); + if (banner && logfiles[id].writes++ % banner == 0) { + char bannerline[256]; + int i, bannerlen; + + bannerlen = MIN(strlen(logfiles[id].banner), sizeof (bannerline) - 1); + + for (i = 0; i < bannerlen; i++) + bannerline[i] = '='; + bannerline[i] = '\0'; + + fprintf(logfiles[id].file, "%s\n", bannerline); + fprintf(logfiles[id].file, "%s\n", logfiles[id].banner); + fprintf(logfiles[id].file, "%s\n", bannerline); + } + + va_start(other_args, format); + vfprintf(logfiles[id].file, format, other_args); + va_end(other_args); + fprintf(logfiles[id].file, "\n"); + + fflush(logfiles[id].file); +} + +/* ================================================== */ + +void +LOG_CycleLogFiles(void) +{ + LOG_FileID i; + + for (i = 0; i < n_filelogs; i++) { + if (logfiles[i].file) + fclose(logfiles[i].file); + logfiles[i].file = NULL; + logfiles[i].writes = 0; + } +} + +/* ================================================== */ |