/* *  OpenVPN -- An application to securely tunnel IP networks *             over a single UDP port, with support for TLS-based *             session authentication and key exchange, *             packet encryption, packet authentication, and *             packet compression. * *  Copyright (C) 2002 James Yonan <jim@yonan.net> * *  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 (see the file COPYING included with this *  distribution); if not, write to the Free Software Foundation, Inc., *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */#ifndef ERROR_H#define ERROR_H/* String and Error functions */#include "basic.h"/* * These globals should not be accessed directly, * but rather through macros or inline functions defined below. */extern bool _use_syslog;extern int _debug_level;extern int _cs_info_level;extern int _cs_verbose_level;extern int msg_line_num;/* msg() flags */#define M_DEBUG_LEVEL     (0x0F)	 /* debug level mask */#define M_FATAL           (1<<4)	 /* exit program */#define M_NONFATAL        (1<<5)	 /* non-fatal error */#define M_WARN	          (1<<6)	 /* call syslog with LOG_WARNING */#define M_DEBUG           (1<<7)#define M_ERRNO           (1<<8)	 /* show errno description */#define M_SSL             (1<<9)	 /* show SSL error */#define M_NOLOCK          (1<<10)        /* don't lock/unlock mutex */      #define M_NOMUTE          (1<<11)        /* don't do mute processing */      #define M_ERR     (M_FATAL | M_ERRNO)#define M_SSLERR  (M_FATAL | M_SSL)/* * Mute levels are designed to avoid large numbers of * mostly similar messages clogging the log file. * * A mute level of 0 is always printed. */#define MUTE_LEVEL_SHIFT 16#define MUTE_LEVEL_MASK 0xFF#define ENCODE_MUTE_LEVEL(mute_level) (((mute_level) & MUTE_LEVEL_MASK) << MUTE_LEVEL_SHIFT)#define DECODE_MUTE_LEVEL(flags) (((flags) >> MUTE_LEVEL_SHIFT) & MUTE_LEVEL_MASK)/* * log_level:  verbosity level n (--verb n) must be >= log_level to print. * mute_level: don't print more than n (--mute n) consecutive messages at *             a given mute level, or if 0 disable muting and print everything. */#define LOGLEV(log_level, mute_level, other) (((log_level)-1) | ENCODE_MUTE_LEVEL(mute_level) | other)#define msg(flags, args...) \    do { if (((flags) & M_DEBUG_LEVEL) < _debug_level || ((flags) & M_FATAL)) \    _msg((flags), args); } while (false)void _msg (unsigned int flags, const char *format, ...); /* should be called via msg above */void error_reset ();void set_check_status (int info_level, int verbose_level);void set_debug_level (int level);void set_mute_cutoff (int cutoff);/* Fatal logic errors */#define ASSERT(x) do { if (!(x)) assert_failed(__FILE__, __LINE__); } while (false)void assert_failed (const char *filename, int line);/* Inline functions */static inline boolcheck_debug_level (int level){  return (level & M_DEBUG_LEVEL) < _debug_level;}static inline voidcheck_status (int status, const char *description){  msg (_cs_verbose_level, "%s returned %d", description, status);  if (status < 0)    msg (_cs_info_level | M_ERRNO, "%s", description);}void become_daemon (const char *cd);void become_inetd_server ();#include "errlevel.h"#endif