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 <unistd.h>
#include "nest/bird.h"
#include "nest/cli.h"
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#include "nest/mrtdump.h"
#include "lib/string.h"
#include "lib/lists.h"
#include "lib/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
#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"
};
/**
* log_commit - commit a log message
* @class: message class information (%L_DEBUG to %L_BUG, see |lib/birdlib.h|)
*
* 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];
tm_format_datetime(tbuf, &config->tf_log, now);
fprintf(l->fh, "%s <%s> ", tbuf, class_names[class]);
}
fputs(buf->start, l->fh);
fputc('\n', l->fh);
fflush(l->fh);
}
#ifdef HAVE_SYSLOG
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(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, char *msg, ...)
{
int last_hit = f->mark;
int class = 1;
va_list args;
/* Rate limiting is a bit tricky here as it also logs '...' during the first hit */
if (tbf_limit(f) && last_hit)
return;
if (*msg >= 1 && *msg <= 8)
class = *msg++;
va_start(args, msg);
vlog(class, (f->mark ? "..." : 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);
}
static list *
default_log_list(int debug, int init, char **syslog_name)
{
static list init_log_list;
init_list(&init_log_list);
*syslog_name = NULL;
#ifdef HAVE_SYSLOG
if (!debug)
{
static struct log_config lc_syslog = { .mask = ~0 };
add_tail(&init_log_list, &lc_syslog.n);
*syslog_name = bird_name;
if (!init)
return &init_log_list;
}
#endif
static struct log_config lc_stderr = { .mask = ~0, .terminal_flag = 1 };
lc_stderr.fh = stderr;
add_tail(&init_log_list, &lc_stderr.n);
return &init_log_list;
}
void
log_switch(int debug, list *l, char *new_syslog_name)
{
if (!l || EMPTY_LIST(*l))
l = default_log_list(debug, !l, &new_syslog_name);
current_log_list = l;
#ifdef HAVE_SYSLOG
if (current_syslog_name && new_syslog_name &&
!strcmp(current_syslog_name, new_syslog_name))
return;
if (current_syslog_name)
closelog();
if (new_syslog_name)
openlog(new_syslog_name, LOG_CONS | LOG_NDELAY, LOG_DAEMON);
current_syslog_name = new_syslog_name;
#endif
}
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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void
mrt_dump_message(struct proto *p, u16 type, u16 subtype, byte *buf, u32 len)
{
/* Prepare header */
put_u32(buf+0, now_real);
put_u16(buf+4, type);
put_u16(buf+6, subtype);
put_u32(buf+8, len - MRTDUMP_HDR_LENGTH);
if (p->cf->global->mrtdump_file != -1)
write(p->cf->global->mrtdump_file, buf, len);
}