/*  MasqMail
    Copyright (C) 1999-2001 Oliver Kurth

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <sys/stat.h>
#include "masqmail.h"

#include "sysexits.h"

static char *_sysexit_strings[] = {
  "command line usage error",
  "data format error",
  "cannot open input",
  "addressee unknown",
  "host name unknown",
  "service unavailable",
  "internal software error",
  "system error (e.g., can't fork)",
  "critical OS file missing",
  "can't create (user) output file",
  "input/output error",
  "temp failure; user is invited to retry",
  "remote error in protocol",
  "permission denied",
  "configuration error"
};

gchar *ext_strerror(int err)
{
  if(err < 1024)
    return strerror(err);
  else
    if(err > 1024 + EX__BASE &&
       (err - 1024 - EX__BASE < sizeof(_sysexit_strings)/sizeof(_sysexit_strings[0])))
      return _sysexit_strings[err - 1024 - EX__BASE];

  return "unknown error";
}

static FILE *logfile = NULL;
static FILE *debugfile = NULL;

gboolean logopen()
{
  gchar *filename;
  mode_t saved_mode = umask(066);

  if(conf.use_syslog){
    openlog(PACKAGE, LOG_PID, LOG_MAIL);
  }else{
    uid_t saved_uid;
    gid_t saved_gid;
    
    saved_gid = setegid(conf.mail_gid);
    saved_uid = seteuid(conf.mail_uid);

    filename = g_strdup_printf("%s/masqmail.log", conf.log_dir);
    logfile = fopen(filename, "a");
    if(!logfile){
      fprintf(stderr, "could not open log '%s': %s\n", filename, strerror(errno));
      return FALSE;
    }
    g_free(filename);

    seteuid(saved_uid);
    setegid(saved_gid);
  }

#ifdef ENABLE_DEBUG
  if(conf.debug_level > 0){
    filename = g_strdup_printf("%s/debug.log", conf.log_dir);
    debugfile = fopen(filename, "a");
    if(!debugfile){
      fprintf(stderr, "could not open debug log '%s'\n", filename);
      return FALSE;
    }
    g_free(filename);
  }
#endif
  umask(saved_mode);
  return TRUE;
}

void logclose()
{
  if(conf.use_syslog)
    closelog();
  else
    if(logfile) fclose(logfile);
  if(debugfile) fclose(debugfile);
}

void vlogwrite(int pri, const char *fmt, va_list args)
{
  if((conf.do_verbose && (pri & LOG_VERBOSE)) || (pri == LOG_ALERT) || (pri == LOG_WARNING)){
    va_list args_copy;
    va_copy(args_copy, args);
    vfprintf(stdout, fmt, args_copy);
    va_end(args_copy);
    fflush(stdout); /* is this necessary? */
  }

  pri &= ~LOG_VERBOSE;
  if(pri){

    if(conf.use_syslog)
      vsyslog(pri, fmt, args);
    else{
      if(pri <= conf.log_max_pri){
	FILE *file = logfile ? logfile : stderr;
	time_t now = time(NULL);
	struct tm *t = localtime(&now);
	gchar buf[24];
	uid_t saved_uid;
	gid_t saved_gid;

	saved_gid = setegid(conf.mail_gid);
	saved_uid = seteuid(conf.mail_uid);

	strftime(buf, 24, "%Y-%m-%d %H:%M:%S", t);
	fprintf(file, "%s [%d] ", buf, getpid());
	
	vfprintf(file, fmt, args);
	fflush(file);

	seteuid(saved_uid);
	setegid(saved_gid);
      }
    }
  }
}  

#ifdef ENABLE_DEBUG
void vdebugwrite(int pri, const char *fmt, va_list args)
{
  time_t now = time(NULL);
  struct tm *t = localtime(&now);
  gchar buf[24];
  strftime(buf, 24, "%Y-%m-%d %H:%M:%S", t);

  if(debugfile){
    fprintf(debugfile, "%s [%d] ", buf, getpid());
  
    vfprintf(debugfile, fmt, args);
    fflush(debugfile);
  }else{
    fprintf(stderr, "no debug file, msg was:\n");
    vfprintf(stderr, fmt, args);
  }
}
#endif

void logwrite(int pri, const char *fmt, ...)
{
  va_list args, args_copy;
  int saved_errno = errno; /* somewhere this is changed to EBADF */

  va_start(args, fmt);
#ifdef ENABLE_DEBUG
  va_copy(args_copy, args);
#endif
  vlogwrite(pri, fmt, args);
#ifdef ENABLE_DEBUG
  if(debugfile)
    vdebugwrite(pri, fmt, args_copy);
  va_end(args_copy);
#endif
  va_end(args);

  errno = saved_errno;
}

#ifdef ENABLE_DEBUG
void debugf(const char *fmt, ...)
{
  va_list args;
  va_start(args, fmt);

  vdebugwrite(LOG_DEBUG, fmt, args);

  va_end(args);
}

void vdebugf(const char *fmt, va_list args)
{
  vdebugwrite(LOG_DEBUG, fmt, args);
}
#endif

void maillog(const char *fmt, ...)
{
  va_list args;
  va_start(args, fmt);

  vlogwrite(LOG_NOTICE, fmt, args);

  va_end(args);
}