Internet on FIRE

/*

 *        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 <sys/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)

{

  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);

    }

#endif

  lc_stderr.fh = stderr;

  add_tail(current_log_list, &lc_stderr.n);

}

void

log_switch(list *l)

{

  if (EMPTY_LIST(*l))

    current_log_list = &init_log_list;

  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);

}