bird/sysdep/unix/log.c

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/*
* BIRD Library -- Logging Functions
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: Logging
*
* The Logging module offers a simple set of functions for writing
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* messages to system logs and to the debug output. Message classes
* used by this module are described in |birdlib.h| and also in the
* user's manual.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "nest/bird.h"
#include "nest/cli.h"
#include "conf/conf.h"
#include "lib/string.h"
#include "lib/lists.h"
#include "sysdep/unix/unix.h"
static FILE *dbgf;
static list *current_log_list;
static char *current_syslog_name; /* NULL -> syslog closed */
#ifdef USE_PTHREADS
#include <pthread.h>
static pthread_mutex_t log_mutex;
static inline void log_lock(void) { pthread_mutex_lock(&log_mutex); }
static inline void log_unlock(void) { pthread_mutex_unlock(&log_mutex); }
static pthread_t main_thread;
void main_thread_init(void) { main_thread = pthread_self(); }
static int main_thread_self(void) { return pthread_equal(pthread_self(), main_thread); }
#else
static inline void log_lock(void) { }
static inline void log_unlock(void) { }
void main_thread_init(void) { }
static int main_thread_self(void) { return 1; }
#endif
#ifdef HAVE_SYSLOG_H
#include <sys/syslog.h>
static int syslog_priorities[] = {
LOG_DEBUG,
LOG_DEBUG,
LOG_DEBUG,
LOG_INFO,
LOG_ERR,
LOG_WARNING,
LOG_ERR,
LOG_ERR,
LOG_CRIT,
LOG_CRIT
};
#endif
static char *class_names[] = {
"???",
"DBG",
"TRACE",
"INFO",
"RMT",
"WARN",
"ERR",
"AUTH",
"FATAL",
"BUG"
};
static inline off_t
log_size(struct log_config *l)
{
struct stat st;
return (!fstat(rf_fileno(l->rf), &st) && S_ISREG(st.st_mode)) ? st.st_size : 0;
}
static void
log_close(struct log_config *l)
{
rfree(l->rf);
l->rf = NULL;
l->fh = NULL;
}
static int
log_open(struct log_config *l)
{
l->rf = rf_open(config->pool, l->filename, "a");
if (!l->rf)
{
/* Well, we cannot do much in case of error as log is closed */
l->mask = 0;
return -1;
}
l->fh = rf_file(l->rf);
l->pos = log_size(l);
return 0;
}
static int
log_rotate(struct log_config *l)
{
log_close(l);
/* If we cannot rename the logfile, we at least try to delete it
in order to continue logging and not exceeding logfile size */
if ((rename(l->filename, l->backup) < 0) &&
(unlink(l->filename) < 0))
{
l->mask = 0;
return -1;
}
return log_open(l);
}
/**
* log_commit - commit a log message
* @class: message class information (%L_DEBUG to %L_BUG, see |lib/birdlib.h|)
* @buf: message to write
*
* This function writes a message prepared in the log buffer to the
* log file (as specified in the configuration). The log buffer is
* reset after that. The log message is a full line, log_commit()
* terminates it.
*
* The message class is an integer, not a first char of a string like
* in log(), so it should be written like *L_INFO.
*/
void
log_commit(int class, buffer *buf)
{
struct log_config *l;
if (buf->pos == buf->end)
strcpy(buf->end - 100, " ... <too long>");
log_lock();
WALK_LIST(l, *current_log_list)
{
if (!(l->mask & (1 << class)))
continue;
if (l->fh)
{
if (l->terminal_flag)
fputs("bird: ", l->fh);
else
{
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byte tbuf[TM_DATETIME_BUFFER_SIZE];
const char *fmt = config ? config->tf_log.fmt1 : "%F %T.%3f";
if (!tm_format_real_time(tbuf, sizeof(tbuf), fmt, current_real_time()))
strcpy(tbuf, "<error>");
if (l->limit)
{
off_t msg_len = strlen(tbuf) + strlen(class_names[class]) +
(buf->pos - buf->start) + 5;
if (l->pos < 0)
l->pos = log_size(l);
if (l->pos + msg_len > l->limit)
if (log_rotate(l) < 0)
continue;
l->pos += msg_len;
}
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fprintf(l->fh, "%s <%s> ", tbuf, class_names[class]);
}
fputs(buf->start, l->fh);
fputc('\n', l->fh);
fflush(l->fh);
}
#ifdef HAVE_SYSLOG_H
else
syslog(syslog_priorities[class], "%s", buf->start);
#endif
}
log_unlock();
/* cli_echo is not thread-safe, so call it just from the main thread */
if (main_thread_self())
cli_echo(class, buf->start);
buf->pos = buf->start;
}
int buffer_vprint(buffer *buf, const char *fmt, va_list args);
static void
vlog(int class, const char *msg, va_list args)
{
buffer buf;
LOG_BUFFER_INIT(buf);
buffer_vprint(&buf, msg, args);
log_commit(class, &buf);
}
/**
* log - log a message
* @msg: printf-like formatting string with message class information
* prepended (%L_DEBUG to %L_BUG, see |lib/birdlib.h|)
*
* This function formats a message according to the format string @msg
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* and writes it to the corresponding log file (as specified in the
* configuration). Please note that the message is automatically
* formatted as a full line, no need to include |\n| inside.
* It is essentially a sequence of log_reset(), logn() and log_commit().
*/
void
log_msg(const char *msg, ...)
{
int class = 1;
va_list args;
va_start(args, msg);
if (*msg >= 1 && *msg <= 8)
class = *msg++;
vlog(class, msg, args);
va_end(args);
}
void
log_rl(struct tbf *f, const char *msg, ...)
{
int class = 1;
va_list args;
/* Rate limiting is a bit tricky here as it also logs '...' during the first hit */
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if (tbf_limit(f) && (f->drop > 1))
return;
if (*msg >= 1 && *msg <= 8)
class = *msg++;
va_start(args, msg);
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vlog(class, (f->drop ? "..." : msg), args);
va_end(args);
}
/**
* bug - report an internal error
* @msg: a printf-like error message
*
* This function logs an internal error and aborts execution
* of the program.
*/
void
bug(const char *msg, ...)
{
va_list args;
va_start(args, msg);
vlog(L_BUG[0], msg, args);
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va_end(args);
abort();
}
/**
* bug - report a fatal error
* @msg: a printf-like error message
*
* This function logs a fatal error and aborts execution
* of the program.
*/
void
die(const char *msg, ...)
{
va_list args;
va_start(args, msg);
vlog(L_FATAL[0], msg, args);
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va_end(args);
exit(1);
}
/**
* debug - write to debug output
* @msg: a printf-like message
*
* This function formats the message @msg and prints it out
* to the debugging output. No newline character is appended.
*/
void
debug(const char *msg, ...)
{
#define MAX_DEBUG_BUFSIZE 65536
va_list args;
static uint bufsize = 4096;
static char *buf = NULL;
if (!buf)
buf = mb_alloc(&root_pool, bufsize);
va_start(args, msg);
if (dbgf)
{
while (bvsnprintf(buf, bufsize, msg, args) < 0)
if (bufsize >= MAX_DEBUG_BUFSIZE)
bug("Extremely long debug output, split it.");
else
buf = mb_realloc(buf, (bufsize *= 2));
fputs(buf, dbgf);
}
va_end(args);
}
static list *
default_log_list(int initial, char **syslog_name)
{
static list log_list;
init_list(&log_list);
*syslog_name = NULL;
#ifdef HAVE_SYSLOG_H
if (!dbgf)
{
static struct log_config lc_syslog = { .mask = ~0 };
add_tail(&log_list, &lc_syslog.n);
*syslog_name = bird_name;
}
#endif
if (dbgf && (dbgf != stderr))
{
static struct log_config lc_debug = { .mask = ~0 };
lc_debug.fh = dbgf;
add_tail(&log_list, &lc_debug.n);
}
if (initial || (dbgf == stderr))
{
static struct log_config lc_stderr = { .mask = ~0, .terminal_flag = 1};
lc_stderr.fh = stderr;
add_tail(&log_list, &lc_stderr.n);
}
return &log_list;
}
void
log_switch(int initial, list *logs, char *new_syslog_name)
{
struct log_config *l;
if (!logs || EMPTY_LIST(*logs))
logs = default_log_list(initial, &new_syslog_name);
/* We shouldn't close the logs when other threads may use them */
log_lock();
/* Close the logs to avoid pinning them on disk when deleted */
if (current_log_list)
WALK_LIST(l, *current_log_list)
if (l->rf)
log_close(l);
/* Reopen the logs, needed for 'configure undo' */
if (logs)
WALK_LIST(l, *logs)
if (l->filename && !l->rf)
log_open(l);
current_log_list = logs;
#ifdef HAVE_SYSLOG_H
if (!bstrcmp(current_syslog_name, new_syslog_name))
goto done;
if (current_syslog_name)
{
closelog();
xfree(current_syslog_name);
current_syslog_name = NULL;
}
if (new_syslog_name)
{
current_syslog_name = xstrdup(new_syslog_name);
openlog(current_syslog_name, LOG_CONS | LOG_NDELAY, LOG_DAEMON);
}
#endif
done:
/* Logs exchange done, let the threads log as before */
log_unlock();
}
void
log_init_debug(char *f)
{
if (dbgf && dbgf != stderr)
fclose(dbgf);
if (!f)
dbgf = NULL;
else if (!*f)
dbgf = stderr;
else if (!(dbgf = fopen(f, "a")))
{
/* Cannot use die() nor log() here, logging is not yet initialized */
fprintf(stderr, "bird: Unable to open debug file %s: %s\n", f, strerror(errno));
exit(1);
}
if (dbgf)
setvbuf(dbgf, NULL, _IONBF, 0);
}