/*
* 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 <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <glib.h>
#include <netdb.h>
#include <arpa/inet.h>
#include "../types.h"
#include "../version.h"
char *_config_file_name = DEFAULT_CLIENT_CONFIG_FILE;
void dnbd3_print_help(char* argv_0)
{
printf("\nUsage: %s\n"
"\t-h <host> -v <vid> [-r <rid>] -d <device> [-a <KB>] || -f <file> || -c <device>\n\n", argv_0);
printf("Start the DNBD3 client.\n");
printf("-f or --file \t\t Configuration file (default /etc/dnbd3-client.conf)\n");
printf("-h or --host \t\t Host running dnbd3-server.\n");
printf("-v or --vid \t\t Volume-ID of exported image.\n");
printf("-r or --rid \t\t Release-ID of exported image (default 0, latest).\n");
printf("-d or --device \t\t DNBD3 device name.\n");
printf("-a or --ahead \t\t Read ahead in KByte (default %i).\n", DEFAULT_READ_AHEAD_KB);
printf("-c or --close \t\t Disconnect and close device.\n");
printf("-s or --switch \t\t Switch dnbd3-server on device (DEBUG).\n");
printf("-H or --help \t\t Show this help text and quit.\n");
printf("-V or --version \t Show version and quit.\n\n");
exit(EXIT_SUCCESS);
}
void dnbd3_print_version()
{
printf("Version: %s\n", VERSION_STRING);
exit(EXIT_SUCCESS);
}
char* dnbd3_get_ip(char* hostname)
{
struct hostent *host;
if ((host = gethostbyname(hostname)) == NULL)
{
printf("FATAL: Unknown host '%s'\n", hostname);
exit(EXIT_FAILURE);
}
return inet_ntoa(*((struct in_addr *) host->h_addr));
}
int main(int argc, char *argv[])
{
int fd;
char *dev = NULL;
int close_dev = 0;
int switch_host = 0;
dnbd3_ioctl_t msg;
msg.host = NULL;
msg.vid = 0;
msg.rid = 0;
msg.read_ahead_kb = DEFAULT_READ_AHEAD_KB;
int opt = 0;
int longIndex = 0;
static const char *optString = "f:h:v:r:d:a:c:s:HV?";
static const struct option longOpts[] =
{
{ "file", required_argument, NULL, 'f' },
{ "host", required_argument, NULL, 'h' },
{ "vid", required_argument, NULL, 'v' },
{ "rid", required_argument, NULL, 'r' },
{ "device", required_argument, NULL, 'd' },
{ "ahead", required_argument, NULL, 'a' },
{ "close", required_argument, NULL, 'c' },
{ "switch", required_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 'h':
msg.host = dnbd3_get_ip(optarg);
break;
case 'v':
msg.vid = atoi(optarg);
break;
case 'r':
msg.rid = atoi(optarg);
break;
case 'd':
dev = optarg;
break;
case 'a':
msg.read_ahead_kb = atoi(optarg);
break;
case 'c':
dev = optarg;
close_dev = 1;
break;
case 's':
msg.host = dnbd3_get_ip(optarg);
switch_host = 1;
break;
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);
}
// close device
if (close_dev && !msg.host && dev && (msg.vid == 0))
{
fd = open(dev, O_WRONLY);
printf("INFO: Closing device %s\n", dev);
if (ioctl(fd, IOCTL_CLOSE, &msg) < 0)
{
printf("ERROR: ioctl not successful (close)\n");
exit(EXIT_FAILURE);
}
close(fd);
exit(EXIT_SUCCESS);
}
// switch host
if (switch_host && msg.host && dev && (msg.vid == 0))
{
fd = open(dev, O_WRONLY);
printf("INFO: Switching device %s to %s\n", dev, msg.host);
if (ioctl(fd, IOCTL_SWITCH, &msg) < 0)
{
printf("ERROR: ioctl not successful (switch)\n");
exit(EXIT_FAILURE);
}
close(fd);
exit(EXIT_SUCCESS);
}
// connect
if (msg.host && dev && (msg.vid != 0))
{
fd = open(dev, O_WRONLY);
printf("INFO: Connecting %s to %s vid:%i rid:%i\n", dev, msg.host, msg.vid, msg.rid);
if (ioctl(fd, IOCTL_OPEN, &msg) < 0)
{
printf("ERROR: ioctl not successful (connect)\n");
exit(EXIT_FAILURE);
}
close(fd);
exit(EXIT_SUCCESS);
}
// use configuration file if exist
GKeyFile* gkf;
int i = 0;
size_t j = 0;
gkf = g_key_file_new();
if (g_key_file_load_from_file(gkf, _config_file_name, G_KEY_FILE_NONE, NULL))
{
gchar **groups = NULL;
groups = g_key_file_get_groups(gkf, &j);
for (i = 0; i < j; i++)
{
msg.host = g_key_file_get_string(gkf, groups[i], "server", NULL);
msg.vid = g_key_file_get_integer(gkf, groups[i], "vid", NULL);
msg.rid = g_key_file_get_integer(gkf, groups[i], "rid", NULL);
dev = g_key_file_get_string(gkf, groups[i], "device", NULL);
msg.read_ahead_kb = g_key_file_get_integer(gkf, groups[i], "ahead", NULL);
if (!msg.read_ahead_kb)
msg.read_ahead_kb = DEFAULT_READ_AHEAD_KB;
fd = open(dev, O_WRONLY);
printf("INFO: Connecting %s to %s vid:%i rid:%i\n", dev, msg.host, msg.vid, msg.rid);
if (ioctl(fd, IOCTL_OPEN, &msg) < 0)
{
printf("ERROR: ioctl not successful (connect)\n");
exit(EXIT_FAILURE);
}
close(fd);
}
g_strfreev(groups);
g_key_file_free(gkf);
exit(EXIT_SUCCESS);
}
else
{
printf("ERROR: Config file not found: %s\n", _config_file_name);
}
g_key_file_free(gkf);
dnbd3_print_help(argv[0]);
exit(EXIT_FAILURE);
}