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syslog changes:
* Unified Logmessage for all auth-types, for success and for failed
* Standard connections get only ONE line in the LOG when level==LOG:
  Auth-attempts are logged only, if authentication is:
        a) successfull or
        b) with passwd or
        c) we had more than AUTH_FAIL_LOG failues
* many log() became verbose()
* old behaviour with level=VERBOSE

/*

log-client.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 21:13:40 1995 ylo

Client-side versions of debug(), log(), etc.  These print to stderr.
This is a stripped down version of log-server.c.

*/

#include "includes.h"
RCSID("$Id: log-client.c,v 1.4 1999/11/22 21:02:38 markus Exp $");

#include "xmalloc.h"
#include "ssh.h"

static LogLevel log_level = SYSLOG_LEVEL_INFO;

/* Initialize the log.
     av0	program name (should be argv[0])
     level	logging level
     */

void
log_init(char *av0, LogLevel level, SyslogFacility ignored1, int ignored2)
{
  switch (level)
    {
    case SYSLOG_LEVEL_QUIET:
    case SYSLOG_LEVEL_ERROR:
    case SYSLOG_LEVEL_FATAL:
    case SYSLOG_LEVEL_INFO:
    case SYSLOG_LEVEL_VERBOSE:
    case SYSLOG_LEVEL_DEBUG:
      log_level = level;
      break;
    default:
      /* unchanged */
      break;
    }
}

#define MSGBUFSIZE 1024

void
do_log(LogLevel level, const char *fmt, va_list args)
{
  char msgbuf[MSGBUFSIZE];

  if (level > log_level)
    return;
  if (level == SYSLOG_LEVEL_DEBUG)
    fprintf(stderr, "debug: ");
  vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
  fprintf(stderr, "%s", msgbuf);
  fprintf(stderr, "\r\n");
}