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backtrace_456.c
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backtrace_456.c
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/***************************************************************************
* Copyright (C) 2017 - 2020, Lanka Hsu, <lankahsu@gmail.com>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include <signal.h>
#include <getopt.h>
#include "utilx9.h"
#define TAG "backtrace_123"
// ** app **
static int is_quit = 0;
static int app_quit(void)
{
return is_quit;
}
static void app_set_quit(int mode)
{
is_quit = mode;
}
static void app_stop(void)
{
if (app_quit()==0)
{
app_set_quit(1);
}
}
// https://cirosantilli.com/linux-kernel-module-cheat#stack-smashing
void crash_it(char *const payload, int len)
{
int i;
for (i = 0; i < len+1; ++i)
{
//assert(i < len);
payload[i] = 0x00;
}
}
void function_deep_2(void)
{
char payload[] = { 0x00, 0x01, 0x02, 0x03};
int len = sizeof(payload);
crash_it(payload, len);
crash_it(payload, len+1);
crash_it(payload, len);
}
void function_deep_1(void)
{
function_deep_2();
}
static void app_loop(void)
{
function_deep_1();
}
static int app_init(void)
{
int ret = 0;
return ret;
}
static void app_exit(void)
{
app_stop();
}
static void app_signal_handler(int signum)
{
DBG_ER_LN("(signum: %d)", signum);
switch (signum)
{
case SIGINT:
case SIGTERM:
case SIGHUP:
app_stop();
break;
case SIGPIPE:
break;
case SIGUSR1:
break;
#ifdef UTIL_EX_BACKTRACE
// *** stack smashing detected ***: terminated
// Aborted (core dumped)
case SIGABRT:
backtraceX_alert(NULL);
break;
#endif
case SIGUSR2:
dbg_lvl_round();
DBG_ER_LN("dbg_lvl_get(): %d", dbg_lvl_get());
DBG_ER_LN("(Version: %s)", version_show());
break;
}
}
static void app_signal_register(void)
{
signal(SIGINT, app_signal_handler);
signal(SIGTERM, app_signal_handler);
signal(SIGHUP, app_signal_handler);
signal(SIGUSR1, app_signal_handler);
signal(SIGUSR2, app_signal_handler);
#ifdef UTIL_EX_BACKTRACE
signal(SIGABRT, app_signal_handler);
#endif
signal(SIGPIPE, SIG_IGN);
}
int option_index = 0;
const char* short_options = "d:h";
static struct option long_options[] =
{
{ "debug", required_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'h' },
{ 0, 0, 0, 0 }
};
static void app_showusage(int exit_code)
{
printf( "Usage: %s\n"
" -d, --debug debug level\n"
" -h, --help\n", TAG);
printf( "Version: %s\n", version_show());
printf( "Example:\n"
" %s -d 4\n", TAG);
exit(exit_code);
}
static void app_ParseArguments(int argc, char **argv)
{
int opt;
while ((opt = getopt_long(argc, argv, short_options, long_options, &option_index)) != -1)
{
switch (opt)
{
case 'd':
if (optarg)
{
dbg_lvl_set(atoi(optarg));
}
break;
default:
app_showusage(-1);
break;
}
}
}
int main(int argc, char *argv[])
{
app_ParseArguments(argc, argv);
app_signal_register();
atexit(app_exit);
backtraceX_init(argc, argv);
if ( app_init() == -1 )
{
return -1;
}
app_loop();
DBG_WN_LN(DBG_TXT_BYE_BYE);
return 0;
}