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/***************************************************Project Mutator****************************************************/
/*first line intentionally left blank.*/
/*Copyright (C) 2017 Farzad Sadeghi
This source file contains mutator's daemon.
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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.*/
/**********************************************************************************************************************/
/*macros*/
#define __DBG
#if 0
#undef __DBG
#endif
/**********************************************************************************************************************/
/*inclusion directives*/
#include "mutatord.h"
#include "daemon_aux.h"
/*library headers*/
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
/**********************************************************************************************************************/
void time_n_date(FILE* infile)
{
time_t tnd = time(NULL);
fprintf(infile, "%s", ctime(&tnd));
}
void sigint_callback_handler(int signum)
{
exit(signum);
}
void sigterm_callback_handler(int signum)
{
//fclose(infile);
exit(signum);
}
int main(void)
{
signal(SIGINT, sigint_callback_handler);
signal(SIGTERM, sigterm_callback_handler);
/*getting a process ID*/
pid_t pid;
/*getting a session ID*/
pid_t sid;
int server_exit_code;
FILE *mut_log;
mut_log = fopen("mutatord-log", "w");
/*printing out time n date*/
fprintf(mut_log, "%s", "daemon started on ");
time_n_date(mut_log);
/*fork off the parent process*/
pid = fork();
fprintf(mut_log, "%s", "child forked on ");
time_n_date(mut_log);
if (pid < 0)
{
//fprintf(mut_log, "%s", "failed to get a pid.\n");
exit(EXIT_FAILURE);
}
if (pid > 0)
{
fprintf(mut_log, "%s%d%s", "successfully got a pid:", pid, "\n");
exit(EXIT_SUCCESS);
}
/*i don't have a bellybutton so we're fine.*/
umask(0);
fprintf(mut_log, "%s", "set umask to 0.\n");
/*create a new session ID for the child process*/
sid = setsid();
if (sid < 0)
{
fprintf(mut_log, "%s", "failed to get an sid.\n");
exit(EXIT_FAILURE);
}
else
{
fprintf(mut_log, "%s%d%s", "got an sid:", sid, "\n");
}
/*change the current working directory*/
if ((chdir("/")) < 0)
{
fprintf(mut_log, "%s", "failed to change to root dir.\n");
exit(EXIT_FAILURE);
}
else
{
fprintf(mut_log, "%s", "changed to root dir.\n");
}
/*close the standard file descriptors*/
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
fprintf(mut_log, "%s", "closed standard file descriptors..\n");
/*deamon loop*/
do
{
fprintf(mut_log, "%s", "running server...\n");
//sleep(1);
server_exit_code = mutator_server(mut_log);
fprintf(mut_log, "%s%d%s", "server terminated with exit code ", server_exit_code, "\n");
fprintf (mut_log, "%s", "closing down server\n");
fclose(mut_log);
}while(0);
/*@DEVI-these obviously will never run. theyre just a reminder that i need to handle the gracefull shutdown*/
#if 0
fclose(mut_log);
exit(EXIT_SUCCESS);
#endif
}
/*last line intentionally left blank*/
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