/*
* 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 <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <signal.h>
#include <getopt.h>
#include <netinet/in.h>
#include <sys/sendfile.h>
#include <sys/stat.h>
#include <pthread.h>
#include "../types.h"
#include "../version.h"
#include "utils.h"
#include "hashtable.h"
int _sock;
pthread_spinlock_t spinlock;
char *config_file_name = DEFAULT_CONFIG_FILE;
void 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\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("-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 print_version()
{
printf("Version: %s\n", VERSION_STRING);
exit(0);
}
void handle_sigpipe(int signum)
{
printf("ERROR: Received signal SIGPIPE, Broken pipe (errno: %i)\n", errno);
return;
}
void handle_sighup(int signum)
{
printf("INFO: SIGHUP received!\n");
printf("INFO: Reloading configuration...\n");
pthread_spin_lock(&spinlock);
reload_config(config_file_name);
pthread_spin_unlock(&spinlock);
}
void handle_sigterm(int signum)
{
printf("INFO: SIGTERM or SIGINT received!\n");
close(_sock);
delete_pid_file();
exit(EXIT_SUCCESS);
}
void *handle_query(void *client_socket)
{
int image_file = -1;
off_t filesize = 0;
int sock = (int)(uintptr_t) client_socket;
struct dnbd3_request request;
struct dnbd3_reply reply;
uint16_t cmd;
while (recv(sock, &request, sizeof(struct dnbd3_request), MSG_WAITALL) > 0)
{
cmd = request.cmd;
switch (cmd)
{
case CMD_GET_SIZE:
pthread_spin_lock(&spinlock); // because of reloading config
image_file = open(ht_search(request.image_id), O_RDONLY);
pthread_spin_unlock(&spinlock);
if (image_file < 0)
{
printf("ERROR: Client requested an unknown image id.\n");
filesize = 0;
}
else
{
struct stat st;
fstat(image_file, &st);
filesize = st.st_size;
}
reply.cmd = request.cmd;
reply.filesize = filesize;
send(sock, (char *) &reply, sizeof(struct dnbd3_reply), 0);
break;
case CMD_GET_BLOCK:
if (image_file < 0)
break;
reply.cmd = request.cmd;
memcpy(reply.handle, request.handle, sizeof(request.handle));
send(sock, (char *) &reply, sizeof(struct dnbd3_reply), 0);
if (sendfile(sock, image_file, (off_t *) &request.offset,
request.size) < 0)
printf("ERROR: sendfile returned -1\n");
break;
default:
printf("ERROR: Unknown command\n");
break;
}
}
close(sock);
printf("Client exit.\n");
pthread_exit((void *) 0);
}
int main(int argc, char* argv[])
{
int demonize = 1;
int opt = 0;
int longIndex = 0;
static const char *optString = "f:nrshv?";
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' },
{ "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");
send_signal(SIGHUP);
return EXIT_SUCCESS;
case 's':
printf("INFO: Stopping running server...\n");
send_signal(SIGTERM);
return EXIT_SUCCESS;
case 'h':
print_help(argv[0]);
break;
case 'v':
print_version();
break;
case '?':
exit(1);
}
opt = getopt_long(argc, argv, optString, longOpts, &longIndex);
}
if (demonize)
daemon(1,0);
pthread_spin_init(&spinlock, PTHREAD_PROCESS_PRIVATE);
load_config(config_file_name);
// setup signal handler
signal(SIGPIPE, handle_sigpipe);
signal(SIGHUP, handle_sighup);
signal(SIGTERM, handle_sigterm);
signal(SIGINT, handle_sigterm);
// setup network
struct sockaddr_in server;
struct sockaddr_in client;
int fd;
unsigned int len;
// Create socket
_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (_sock < 0)
{
printf("ERROR: Socket failure\n");
exit(EXIT_FAILURE);
}
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET; // IPv4
server.sin_addr.s_addr = htonl(INADDR_ANY); // Take all IPs
server.sin_port = htons(PORT); // set port number
// Bind to socket
if (bind(_sock, (struct sockaddr*) &server, sizeof(server)) < 0)
{
printf("ERROR: Bind failure\n");
exit(EXIT_FAILURE);
}
// Listen on socket
if (listen(_sock, 50) == -1)
{
printf("ERROR: Listen failure\n");
exit(EXIT_FAILURE);
}
write_pid_file(getpid());
printf("INFO: Server is ready...\n");
while (1)
{
len = sizeof(client);
fd = accept(_sock, (struct sockaddr*) &client, &len);
if (fd < 0)
{
printf("ERROR: Accept failure\n");
exit(EXIT_FAILURE);
}
printf("INFO: Client: %s connected\n", inet_ntoa(client.sin_addr));
// FIXME: catch SIGKILL/SIGTERM and close all socket before exit
pthread_t thread;
pthread_create(&(thread), NULL, handle_query, (void *)(uintptr_t) fd);
pthread_detach(thread);
}
close(_sock);
delete_pid_file();
return EXIT_SUCCESS;
}
