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/*
* error -- OpenVPN compatible error reporting API
* https://community.openvpn.net/openvpn/wiki/Tapctl
*
* Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
* Copyright (C) 2018 Simon Rozman <simon@rozman.si>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef ERROR_H
#define ERROR_H
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
/*
* These globals should not be accessed directly,
* but rather through macros or inline functions defined below.
*/
extern unsigned int x_debug_level;
extern int x_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_NOMUTE (1<<11) /* don't do mute processing */
#define M_NOPREFIX (1<<12) /* don't show date/time prefix */
#define M_USAGE_SMALL (1<<13) /* fatal options error, call usage_small */
#define M_MSG_VIRT_OUT (1<<14) /* output message through msg_status_output callback */
#define M_OPTERR (1<<15) /* print "Options error:" prefix */
#define M_NOLF (1<<16) /* don't print new line */
#define M_NOIPREFIX (1<<17) /* don't print instance prefix */
/* flag combinations which are frequently used */
#define M_ERR (M_FATAL | M_ERRNO)
#define M_USAGE (M_USAGE_SMALL | M_NOPREFIX | M_OPTERR)
#define M_CLIENT (M_MSG_VIRT_OUT | M_NOMUTE | M_NOIPREFIX)
/** Check muting filter */
bool dont_mute(unsigned int flags);
/* Macro to ensure (and teach static analysis tools) we exit on fatal errors */
#ifdef _MSC_VER
#pragma warning(disable: 4127) /* EXIT_FATAL(flags) macro raises "warning C4127: conditional expression is constant" on each non M_FATAL invocation. */
#endif
#define EXIT_FATAL(flags) do { if ((flags) & M_FATAL) {_exit(1);}} while (false)
#define HAVE_VARARG_MACROS
#define msg(flags, ...) do { if (msg_test(flags)) {x_msg((flags), __VA_ARGS__);} EXIT_FATAL(flags); } while (false)
#ifdef ENABLE_DEBUG
#define dmsg(flags, ...) do { if (msg_test(flags)) {x_msg((flags), __VA_ARGS__);} EXIT_FATAL(flags); } while (false)
#else
#define dmsg(flags, ...)
#endif
void x_msg(const unsigned int flags, const char *format, ...); /* should be called via msg above */
void x_msg_va(const unsigned int flags, const char *format, va_list arglist);
/* Inline functions */
static inline bool
check_debug_level(unsigned int level)
{
return (level & M_DEBUG_LEVEL) <= x_debug_level;
}
/** Return true if flags represent and enabled, not muted log level */
static inline bool
msg_test(unsigned int flags)
{
return check_debug_level(flags) && dont_mute(flags);
}
#endif /* ifndef ERROR_H */
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