/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <signal.h>
#include <getopt.h>
#include <pthread.h>
#include <string.h>
#include <fcntl.h>
#include "../types.h"
#include "../version.h"
#include "server.h"
#include "utils.h"
#include "net.h"
#include "ipc.h"
int _sock;
pthread_spinlock_t _spinlock;
GSList *_dnbd3_clients = NULL;
char *_config_file_name = DEFAULT_SERVER_CONFIG_FILE;
dnbd3_image_t *_images;
size_t _num_images = 0;
void dnbd3_print_help(char* argv_0)
{
printf("Usage: %s [OPTIONS]...\n", argv_0);
printf("Start the DNBD3 server\n");
printf("-f or --file \t\t Configuration file (default /etc/dnbd3-server.conf)\n");
printf("-n or --nodaemon \t Start server in foreground\n");
printf("-r or --reload \t\t Reload configuration file\n");
printf("-s or --stop \t\t Stop running dnbd3-server\n");
printf("-i or --info \t\t Print connected clients and used images\n");
printf("-H or --help \t\t Show this help text and quit\n");
printf("-V or --version \t Show version and quit\n");
exit(0);
}
void dnbd3_print_version()
{
printf("Version: %s\n", VERSION_STRING);
exit(0);
}
void dnbd3_cleanup()
{
int i, fd;
printf("INFO: Cleanup...\n");
pthread_spin_lock(&_spinlock);
GSList *iterator = NULL;
for (iterator = _dnbd3_clients; iterator; iterator = iterator->next)
{
dnbd3_client_t *client = iterator->data;
shutdown(client->sock, SHUT_RDWR);
pthread_join(*client->thread, NULL);
}
g_slist_free(_dnbd3_clients);
for (i = 0; i < _num_images; i++)
{
// save cache maps to files
if (_images[i].cache_file)
{
char tmp[strlen(_images[i].cache_file)+4];
strcpy(tmp, _images[i].cache_file);
strcat(tmp, ".map");
fd = open(tmp, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd > 0)
write(fd, _images[i].cache_map, (_images[i].filesize >> 15) * sizeof(char));
close(fd);
}
free(_images[i].group);
free(_images[i].file);
free(_images[i].servers);
free(_images[i].serverss);
free(_images[i].cache_file);
free(_images[i].cache_map);
}
pthread_spin_unlock(&_spinlock);
close(_sock);
free(_images);
#ifndef IPC_TCP
unlink(UNIX_SOCKET);
#endif
exit(EXIT_SUCCESS);
}
int main(int argc, char* argv[])
{
int demonize = 1;
int opt = 0;
int longIndex = 0;
static const char *optString = "f:nrsiHV?";
static const struct option longOpts[] =
{
{ "file", required_argument, NULL, 'f' },
{ "nodaemon", no_argument, NULL, 'n' },
{ "reload", no_argument, NULL, 'r' },
{ "stop", no_argument, NULL, 's' },
{ "info", no_argument, NULL, 'i' },
{ "help", no_argument, NULL, 'H' },
{ "version", no_argument, NULL, 'V' } };
opt = getopt_long(argc, argv, optString, longOpts, &longIndex);
while (opt != -1)
{
switch (opt)
{
case 'f':
_config_file_name = optarg;
break;
case 'n':
demonize = 0;
break;
case 'r':
printf("INFO: Reloading configuration file...\n\n");
dnbd3_ipc_send(IPC_RELOAD);
return EXIT_SUCCESS;
case 's':
printf("INFO: Stopping running server...\n\n");
dnbd3_ipc_send(IPC_EXIT);
return EXIT_SUCCESS;
case 'i':
printf("INFO: Requesting information...\n\n");
dnbd3_ipc_send(IPC_INFO);
return EXIT_SUCCESS;
case 'H':
dnbd3_print_help(argv[0]);
break;
case 'V':
dnbd3_print_version();
break;
case '?':
dnbd3_print_help(argv[0]);
}
opt = getopt_long(argc, argv, optString, longOpts, &longIndex);
}
if (demonize)
daemon(1, 0);
// load config file
dnbd3_load_config(_config_file_name);
// setup signal handler
signal(SIGPIPE, dnbd3_handle_sigpipe);
signal(SIGTERM, dnbd3_handle_sigterm);
signal(SIGINT, dnbd3_handle_sigterm);
// setup network
_sock = dnbd3_setup_socket();
if (_sock < 0)
exit(EXIT_FAILURE);
struct sockaddr_in client;
unsigned int len = sizeof(client);
int fd;
struct timeval timeout;
timeout.tv_sec = SOCKET_TIMEOUT_SERVER;
timeout.tv_usec = 0;
// setup icp
pthread_t thread_ipc;
pthread_create(&(thread_ipc), NULL, dnbd3_ipc_receive, NULL);
pthread_spin_init(&_spinlock, PTHREAD_PROCESS_PRIVATE);
printf("INFO: Server is ready...\n");
// main loop
while (1)
{
fd = accept(_sock, (struct sockaddr*) &client, &len);
if (fd < 0)
{
printf("ERROR: Accept failure\n");
continue;
}
printf("INFO: Client %s connected\n", inet_ntoa(client.sin_addr));
setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *) &timeout, sizeof(timeout));
setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *) &timeout, sizeof(timeout));
pthread_t thread;
dnbd3_client_t *dnbd3_client = (dnbd3_client_t *) malloc(sizeof(dnbd3_client_t));
pthread_spin_init(&dnbd3_client->spinlock, PTHREAD_PROCESS_PRIVATE);
strcpy(dnbd3_client->ip, inet_ntoa(client.sin_addr));
dnbd3_client->sock = fd;
dnbd3_client->thread = &thread;
dnbd3_client->image = NULL;
pthread_spin_lock(&_spinlock);
_dnbd3_clients = g_slist_append(_dnbd3_clients, dnbd3_client);
pthread_spin_unlock(&_spinlock);
pthread_create(&(thread), NULL, dnbd3_handle_query, (void *) (uintptr_t) dnbd3_client);
pthread_detach(thread);
}
dnbd3_cleanup();
}
