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avoid extra fd per sshd, from millert@

/*

log-server.c

Author: Tatu Ylonen <ylo@cs.hut.fi>

Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                   All rights reserved

Created: Mon Mar 20 21:19:30 1995 ylo

Server-side versions of debug(), log(), etc.  These normally send the output
to the system log.

*/

#include "includes.h"
RCSID("$Id: log-server.c,v 1.8 1999/11/14 22:28:44 markus Exp $");

#include <syslog.h>
#include "packet.h"
#include "xmalloc.h"
#include "ssh.h"

static LogLevel log_level = SYSLOG_LEVEL_INFO;
static int log_on_stderr = 0;
static int log_facility = LOG_AUTH;

/* Initialize the log.
     av0	program name (should be argv[0])
     on_stderr	print also on stderr
     level	logging level
     */

void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
{
  
  switch (level)
    {
    case SYSLOG_LEVEL_QUIET:
    case SYSLOG_LEVEL_ERROR:
    case SYSLOG_LEVEL_FATAL:
    case SYSLOG_LEVEL_INFO:
    case SYSLOG_LEVEL_CHAT:
    case SYSLOG_LEVEL_DEBUG:
      log_level = level;
      break;
    default:
      fprintf(stderr, "Unrecognized internal syslog level code %d\n",
	      (int)level);
      exit(1);
    }

  switch (facility)
    {
    case SYSLOG_FACILITY_DAEMON:
      log_facility = LOG_DAEMON;
      break;
    case SYSLOG_FACILITY_USER:
      log_facility = LOG_USER;
      break;
    case SYSLOG_FACILITY_AUTH:
      log_facility = LOG_AUTH;
      break;
    case SYSLOG_FACILITY_LOCAL0:
      log_facility = LOG_LOCAL0;
      break;
    case SYSLOG_FACILITY_LOCAL1:
      log_facility = LOG_LOCAL1;
      break;
    case SYSLOG_FACILITY_LOCAL2:
      log_facility = LOG_LOCAL2;
      break;
    case SYSLOG_FACILITY_LOCAL3:
      log_facility = LOG_LOCAL3;
      break;
    case SYSLOG_FACILITY_LOCAL4:
      log_facility = LOG_LOCAL4;
      break;
    case SYSLOG_FACILITY_LOCAL5:
      log_facility = LOG_LOCAL5;
      break;
    case SYSLOG_FACILITY_LOCAL6:
      log_facility = LOG_LOCAL6;
      break;
    case SYSLOG_FACILITY_LOCAL7:
      log_facility = LOG_LOCAL7;
      break;
    default:
      fprintf(stderr, "Unrecognized internal syslog facility code %d\n",
	      (int)facility);
      exit(1);
    }

  log_on_stderr = on_stderr;
}

#define MSGBUFSIZE 1024

void
do_log(LogLevel level, const char *fmt, va_list args)
{
  char msgbuf[MSGBUFSIZE];
  char fmtbuf[MSGBUFSIZE];
  char *txt = NULL;
  int pri = LOG_INFO;
  extern char *__progname;

  if (level > log_level)
    return;
  switch (level)
    {
    case SYSLOG_LEVEL_ERROR:
      txt = "error";
      pri = LOG_ERR;
      break;
    case SYSLOG_LEVEL_FATAL:
      txt = "fatal";
      pri = LOG_ERR;
      break;
    case SYSLOG_LEVEL_INFO:
      pri = LOG_INFO;
      break;
    case SYSLOG_LEVEL_CHAT:
      pri = LOG_INFO;
      break;
    case SYSLOG_LEVEL_DEBUG:
      txt = "debug";
      pri = LOG_DEBUG;
      break;
    default:
      txt = "internal error";
      pri = LOG_ERR;
      break;
    }

  if (txt != NULL) {
    snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
    vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
  }else{
    vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
  }
  if (log_on_stderr)
    fprintf(stderr, "%s\n", msgbuf);
  openlog(__progname, LOG_PID, log_facility);
  syslog(pri, "%.500s", msgbuf);
  closelog();
}