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/*
* 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 <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <sys/stat.h>
#include <grp.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <netinet/in.h>
#include "ipc.h"
#include "config.h"
#include "server.h"
#include "utils.h"
void* dnbd3_ipc_receive()
{
int server_sock, client_sock;
struct sockaddr_un server, client;
unsigned int len = sizeof(client);
GSList *iterator = NULL;
struct tm * timeinfo;
char time_buff[64];
// Create socket
if ((server_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
{
perror("ERROR: IPC socket");
exit(EXIT_FAILURE);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, UNIX_SOCKET);
unlink(UNIX_SOCKET);
// Bind to socket
if (bind(server_sock, &server, sizeof(server.sun_family) + strlen(server.sun_path)) < 0)
{
perror("ERROR: IPC bind");
exit(EXIT_FAILURE);
}
// Listen on socket
if (listen(server_sock, 5) < 0)
{
perror("ERROR: IPC listen");
exit(EXIT_FAILURE);
}
// Set groupID and permissions on ipc socket
struct group *grp;
grp = getgrnam(UNIX_SOCKET_GROUP);
if (grp == NULL)
{
printf("WARN: Group '%s' not found.\n", UNIX_SOCKET_GROUP);
}
else
{
chmod(UNIX_SOCKET, 0775);
chown(UNIX_SOCKET, -1, grp->gr_gid);
}
while (1)
{
int i = 0;
uint32_t cmd;
// Accept connection
if ((client_sock = accept(server_sock, &client, &len)) < 0)
{
perror("ERROR: IPC accept");
exit(EXIT_FAILURE);
}
recv(client_sock, &cmd, sizeof(cmd), MSG_WAITALL);
switch (ntohl(cmd))
{
case IPC_EXIT:
printf("INFO: Server shutdown...\n");
close(client_sock);
close(server_sock);
dnbd3_cleanup();
break;
case IPC_RELOAD:
printf("INFO: Reloading configuration...\n");
dnbd3_reload_config(_config_file_name);
close(client_sock);
break;
case IPC_INFO:
pthread_spin_lock(&_spinlock);
int reply_size = (g_slist_length(_dnbd3_clients) + _num_images) * 4096 + 20;
char *reply = calloc(reply_size, sizeof(char));
char line[4096];
strcat(reply, "Exported images (atime, vid, rid, file):\n");
strcat( reply, "========================================\n");
for (i = 0; i < _num_images; i++)
{
timeinfo = localtime(&_images[i].atime);
strftime (time_buff,64,"%d.%m.%y %H:%M:%S",timeinfo);
sprintf(line, "%s\t%i\t%i\t%s\n", time_buff, _images[i].vid, _images[i].rid,_images[i].file);
strcat(reply, line);
}
sprintf(line, "\nNumber images: %Zu\n\n", _num_images);
strcat(reply, line);
strcat(reply, "Connected clients (ip, file):\n");
strcat(reply, "=============================\n");
for (iterator = _dnbd3_clients; iterator; iterator = iterator->next)
{
dnbd3_client_t *client = iterator->data;
if (client->image)
{
sprintf(line, "%s\t%s\n", client->ip, client->image->file);
strcat(reply, line);
}
}
sprintf(line, "\nNumber clients: %i\n\n", g_slist_length(_dnbd3_clients));
strcat(reply, line);
send(client_sock, reply, reply_size*sizeof(char), MSG_WAITALL);
pthread_spin_unlock(&_spinlock);
close(client_sock);
free(reply);
break;
default:
printf("ERROR: Unknown command: %i\n", cmd);
close(client_sock);
break;
}
}
close(server_sock);
}
void dnbd3_ipc_send(int cmd)
{
int client_sock;
struct sockaddr_un server;
uint32_t cmd_net = htonl(cmd);
char buf[64];
// Create socket
if ((client_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
{
perror("ERROR: IPC socket");
exit(EXIT_FAILURE);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, UNIX_SOCKET);
// Connect to server
if (connect(client_sock, &server, sizeof(server.sun_family) + strlen(server.sun_path)) < 0)
{
perror("ERROR: IPC connect");
exit(EXIT_FAILURE);
}
// Send and receive messages
send(client_sock, &cmd_net, sizeof(cmd_net), MSG_WAITALL);
while (recv(client_sock, &buf, sizeof(buf), MSG_WAITALL) > 0)
printf("%s", buf);
close(client_sock);
}
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