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sdevd.cpp
132 lines (108 loc) · 3.12 KB
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sdevd.cpp
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/*********************************************************
File Name:sdevd.cpp
Author: Abby Cin
Mail: abbytsing@gmail.com
Created Time: Sat 07 Nov 2015 04:06:27 PM CST
**********************************************************/
#include "sudodev.h"
#include <iostream>
#include <fstream>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <map>
using std::cerr;
using std::endl;
static std::ofstream logs;
static bool exit_flag;
void hup_handler(int sig)
{
logs << "Cought signal " << sig << " restart..." << endl;
}
void term_handler(int sig)
{
logs << "Cought signal " << sig << " exit..." << endl;
exit_flag = true;
}
static void device_helper()
{
if(get_plugin_dev() == -1)
{
exit_flag = true;
logs << "Can't get available devices,eixt...\n";
}
sleep(1);
}
int main()
{
if(getuid())
{
cerr << "Please run as root! exit..." << endl;
exit(1);
}
if(to_daemon() == -1)
{
cerr << "Can't turn into daemon, exit..." << endl;
exit(1);
}
logs.open(LOG_PATH, logs.out | logs.app);
if(!logs.good())
{
cerr << "Can't open log, exit..." << endl;
exit(1);
}
logs << std::unitbuf;
logs << "++++++++ program started! ++++++++" << endl;
if(add_group() == -1)
{
logs << "Can't add group, exit..." << endl;
logs.close();
exit(1);
}
if(drop_in() == -1)
{
logs << "Can't enbale `drop in` support, exit..."
<< endl;
logs.close();
exit(1);
}
std::string msg;
if(record_pid(msg) == -1)
{
logs << msg << endl;
logs.close();
exit(1);
}
if(install_handler(SIGHUP, hup_handler) == -1 ||
install_handler(SIGTERM, term_handler) == -1)
{
logs << "Can't install signal handlers: " << strerror(errno)
<< " exit..." << endl;
logs.close();
exit(1);
}
std::string qualified_dev;
while(!exit_flag)
{
if(log_truncate() == -1)
break;
while(!is_qualified_device(qualified_dev) && !exit_flag)
device_helper();
if(!exit_flag)
{
privilege(true);
logs << qualified_dev << " granted privilege!\n";
}
while(is_qualified_device(qualified_dev) && !exit_flag)
device_helper();
privilege(false);
logs << "Dropped privilege!\n";
}
time_t tm = time(NULL);
logs << "Program exited: " << ctime(&tm) << endl;
logs.close();
unlink(PID_PATH);
return 0;
}