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/*
* Dibbler - a portable DHCPv6
*
* authors: Tomasz Mrugalski <thomson@klub.com.pl>
* Marek Senderski <msend@o2.pl>
* changes: Michal Kowalczuk <michal@kowalczuk.eu>
*
* released under GNU GPL v2 only licence
*
* $Id: daemon.cpp,v 1.3 2008-11-13 22:29:55 thomson Exp $
*
*/
#include <iostream>
#include <string>
#include <fstream>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "Portable.h"
#include "Logger.h"
extern int status();
extern int run();
using namespace std;
int getPID(const char * file) {
ifstream pidfile(file);
if (!pidfile.is_open())
return -1;
int pid;
pidfile >> pid;
return pid;
}
int getClientPID() {
return getPID(CLNTPID_FILE);
}
int getServerPID() {
return getPID(SRVPID_FILE);
}
int getRelayPID() {
return getPID(RELPID_FILE);
}
void daemon_init() {
//FIXME: daemon should close all open files
//fclose(stdin);
//fclose(stdout);
//fclose(stderr);
int childpid;
cout << "Starting daemon..." << endl;
logger::EchoOff();
if (getppid()!=1) {
#ifdef SIGTTOU
signal(SIGTTOU, SIG_IGN);
#endif
#ifdef SIGTTIN
signal(SIGTTIN, SIG_IGN);
#endif
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif
if ( (childpid = fork()) <0 ) {
Log(Crit) << "Can't fork first child." << endl;
return;
} else if (childpid > 0)
exit(0); // parent process
#if 0
// TODO: daemon spawning in Mac OS is done a bit differently
if (setpgrp(0) == -1) {
Log(Crit) << "Can't change process group." << endl;
return;
}
#endif
signal( SIGHUP, SIG_IGN);
if ( (childpid = fork()) <0) {
cout << "Can't fork second child." << endl;
return;
} else if (childpid > 0)
exit(0); // first child
} // getppid()!=1
umask(DEFAULT_UMASK);
}
void daemon_die() {
logger::Terminate();
logger::EchoOn();
}
int init(const char * pidfile, const char * workdir) {
string tmp;
char buf[20];
char cmd[256];
int pid = getPID(pidfile);
if (pid != -1) {
sprintf(buf,"/proc/%d", pid);
if (!access(buf, F_OK)) {
sprintf(buf, "/proc/%d/exe", pid);
int len=readlink(buf, cmd, sizeof(cmd));
if(len!=-1) {
cmd[len]=0;
if(strstr(cmd, "dibbler")==NULL) {
Log(Warning) << "Process is running but it is not Dibbler (pid=" << pid
<< ", name " << cmd << ")." << LogEnd;
} else {
Log(Crit) << "Process already running and it seems to be Dibbler (pid="
<< pid << ", name " << cmd << ")." << LogEnd;
return 0;
}
} else {
Log(Crit) << "Process already running (pid=" << pid << ", file " << pidfile
<< " is present)." << LogEnd;
return 0;
}
} else {
Log(Warning) << "Pid file found (pid=" << pid << ", file " << pidfile
<< "), but process " << pid << " does not exist." << LogEnd;
}
}
unlink(pidfile);
ofstream pidFile(pidfile);
if (!pidFile.is_open()) {
Log(Crit) << "Unable to create " << pidfile << " file." << LogEnd;
return 0;
}
pidFile << getpid();
pidFile.close();
Log(Notice) << "My pid (" << getpid() << ") is stored in " << pidfile << LogEnd;
if (chdir(workdir)) {
Log(Crit) << "Unable to change directory to " << workdir << "." << LogEnd;
return 0;
}
umask(DEFAULT_UMASK);
return 1;
}
void die(const char * pidfile) {
if (unlink(pidfile)) {
Log(Warning) << "Unable to delete " << pidfile << "." << LogEnd;
}
}
int start(const char * pidfile, const char * workdir) {
int result;
daemon_init();
result = run();
daemon_die();
return result;
}
int stop(const char * pidfile) {
int pid = getPID(pidfile);
if (pid==-1) {
cout << "Process is not running." << endl;
return -1;
}
cout << "Sending KILL signal to process " << pid << endl;
kill(pid, SIGTERM);
return 0;
}
int install() {
return 0;
}
int uninstall() {
return 0;
}
/** things to do just after started */
void logStart(const char * note, const char * logname, const char * logfile) {
std::cout << DIBBLER_COPYRIGHT1 << " " << note << std::endl;
std::cout << DIBBLER_COPYRIGHT2 << std::endl;
std::cout << DIBBLER_COPYRIGHT3 << std::endl;
std::cout << DIBBLER_COPYRIGHT4 << std::endl;
logger::setLogName(logname);
logger::Initialize(logfile);
logger::EchoOff();
Log(Notice) << DIBBLER_COPYRIGHT1 << " " << note << LogEnd;
logger::EchoOn();
}
/** things to do just before end
*/
void logEnd() {
logger::Terminate();
}
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