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/*
* Copyright (C) 2011-2012 Savoir-Faire Linux Inc.
* Copyright (C) 2010 Michael Kerrisk
* Copyright (C) 2007-2009 Rémi Denis-Courmont
*
* Author: Rafaël Carré <rafael.carre@savoirfairelinux.com>
*
* 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 3 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.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <unistd.h>
#include <libgen.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fstream>
#include <cstdlib>
#include <signal.h>
#include <string>
#include <sstream>
#include <iostream>
#include <unistd.h>
#include <cstring>
#include <fcntl.h>
#include <pwd.h>
#include <cerrno>
#include "fileutils.h"
#include "logger.h"
namespace fileutils {
// returns true if directory exists
bool check_dir(const char *path)
{
DIR *dir = opendir(path);
if (!dir) { // doesn't exist
if (mkdir(path, 0755) != 0) { // couldn't create the dir
perror(path);
return false;
}
} else
closedir(dir);
return true;
}
static char *program_dir = NULL;
void set_program_dir(char *program_path)
{
program_dir = dirname(program_path);
}
const char *get_program_dir()
{
return program_dir;
}
// FIXME: This should use our real DATADIR
std::string
get_data_dir()
{
return std::string(get_program_dir()) + "/../../share/sflphone/ringtones/";
}
namespace {
/* Lock a file region */
int
lockReg(int fd, int cmd, int type, int whence, int start, off_t len)
{
struct flock fl;
fl.l_type = type;
fl.l_whence = whence;
fl.l_start = start;
fl.l_len = len;
return fcntl(fd, cmd, &fl);
}
int /* Lock a file region using nonblocking F_SETLK */
lockRegion(int fd, int type, int whence, int start, int len)
{
return lockReg(fd, F_SETLK, type, whence, start, len);
}
}
FileHandle
create_pidfile()
{
const std::string name(get_home_dir() + DIR_SEPARATOR_STR PIDFILE);
FileHandle f(name);
char buf[100];
f.fd = open(f.name.c_str(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (f.fd == -1) {
ERROR("Could not open PID file %s", f.name.c_str());
return f;
}
if (lockRegion(f.fd, F_WRLCK, SEEK_SET, 0, 0) == -1) {
if (errno == EAGAIN or errno == EACCES)
ERROR("PID file '%s' is locked; probably "
"'%s' is already running", f.name.c_str(), PACKAGE_NAME);
else
ERROR("Unable to lock PID file '%s'", f.name.c_str());
close(f.fd);
f.fd = -1;
return f;
}
if (ftruncate(f.fd, 0) == -1) {
ERROR("Could not truncate PID file '%s'", f.name.c_str());
close(f.fd);
f.fd = -1;
return f;
}
snprintf(buf, sizeof(buf), "%ld\n", (long) getpid());
const int buf_strlen = strlen(buf);
if (write(f.fd, buf, buf_strlen) != buf_strlen) {
ERROR("Problem writing to PID file '%s'", f.name.c_str());
close(f.fd);
f.fd = -1;
return f;
}
return f;
}
bool isDirectoryWritable(const std::string &directory)
{
return access(directory.c_str(), W_OK) == 0;
}
FileHandle::FileHandle(const std::string &n) : fd(-1), name(n)
{}
FileHandle::~FileHandle()
{
// we will only delete the file if it was created by this process
if (fd != -1) {
close(fd);
if (unlink(name.c_str()) == -1)
ERROR("%s", strerror(errno));
}
}
std::string
get_home_dir()
{
// 1) try getting user's home directory from the environment
const std::string home(PROTECTED_GETENV("HOME"));
if (not home.empty())
return home;
// 2) try getting it from getpwuid_r (i.e. /etc/passwd)
const long max = sysconf(_SC_GETPW_R_SIZE_MAX);
if (max != -1) {
char buf[max];
struct passwd pwbuf, *pw;
if (getpwuid_r(getuid(), &pwbuf, buf, sizeof(buf), &pw) == 0 and pw != NULL)
return pw->pw_dir;
}
return "";
}
}
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