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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
* 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 "nest/bird.h"
#include "nest/cli.h"
#include "lib/string.h"
#include "lib/lists.h"
#include "lib/unix.h"
static FILE *dbgf = NULL;
static list *current_log_list;
static list init_log_list;
#ifdef HAVE_SYSLOG
#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 void
vlog(int class, char *msg, va_list args)
{
char buf[1024];
struct log_config *l;
if (bvsnprintf(buf, sizeof(buf)-1, msg, args) < 0)
bsprintf(buf + sizeof(buf) - 100, " ... <too long>");
WALK_LIST(l, *current_log_list)
{
if (!(l->mask & (1 << class)))
continue;
if (l->fh)
{
time_t now = time(NULL);
struct tm *tm = localtime(&now);
if (l->terminal_flag)
fputs("bird: ", l->fh);
else
{
fprintf(l->fh, "%02d-%02d-%04d %02d:%02d:%02d <%s> ",
tm->tm_mday,
tm->tm_mon+1,
tm->tm_year+1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec,
class_names[class]);
}
fputs(buf, l->fh);
fputc('\n', l->fh);
fflush(l->fh);
}
#ifdef HAVE_SYSLOG
else
syslog(syslog_priorities[class], "%s", buf);
#endif
}
cli_echo(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
* 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.
*/
void
log(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);
}
/**
* 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(char *msg, ...)
{
va_list args;
va_start(args, msg);
vlog(L_BUG[0], msg, 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(char *msg, ...)
{
va_list args;
va_start(args, msg);
vlog(L_FATAL[0], msg, 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(char *msg, ...)
{
va_list args;
char buf[1024];
va_start(args, msg);
if (dbgf)
{
if (bvsnprintf(buf, sizeof(buf), msg, args) < 0)
bsprintf(buf + sizeof(buf) - 100, " ... <too long>\n");
fputs(buf, dbgf);
}
va_end(args);
}
void
log_init(int debug, int init)
{
static struct log_config lc_stderr = { mask: ~0, terminal_flag: 1 };
init_list(&init_log_list);
current_log_list = &init_log_list;
#ifdef HAVE_SYSLOG
if (!debug)
{
static struct log_config lc_syslog = { mask: ~0 };
openlog("bird", LOG_CONS | LOG_NDELAY, LOG_DAEMON);
add_tail(current_log_list, &lc_syslog.n);
if (!init)
return;
}
#endif
lc_stderr.fh = stderr;
add_tail(current_log_list, &lc_stderr.n);
}
void
log_switch(int debug, list *l)
{
if (EMPTY_LIST(*l))
log_init(debug, 0);
else
current_log_list = l;
}
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")))
log(L_ERR "Error opening debug file `%s': %m", f);
if (dbgf)
setvbuf(dbgf, NULL, _IONBF, 0);
}
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