/*
* 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 <netdb.h>
#include <arpa/inet.h>
#include <string.h>
#include "../types.h"
#include "../version.h"
void dnbd3_print_help(char *argv_0)
{
printf("\nUsage: %s\n"
"\t-h <host> -i <image name> [-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("-i or --image \t\t Image name 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);
}
/**
* Parse IPv4 or IPv6 address in string representation to a suitable format usable by the BSD socket library
* @string eg. "1.2.3.4" or "2a01::10:5", optially with port appended, eg "1.2.3.4:6666" or "[2a01::10:5]:6666"
* @af will contain either AF_INET or AF_INET6
* @addr will contain the address in network representation
* @port will contain the port in network representation, defaulting to #define PORT if none was given
* returns 1 on success, 0 in failure. contents of af, addr and port are undefined in the latter case
* !! Contents of @string might be modified by this function !!
*/
static char parse_address(char *string, dnbd3_host_t *host)
{
struct in_addr v4;
struct in6_addr v6;
// Try IPv4 without port
if (1 == inet_pton(AF_INET, string, &v4))
{
host->type = AF_INET;
memcpy(host->addr, &v4, 4);
host->port = htons(PORT);
return 1;
}
// Try IPv6 without port
if (1 == inet_pton(AF_INET6, string, &v6))
{
host->type = AF_INET6;
memcpy(host->addr, &v6, 16);
host->port = htons(PORT);
return 1;
}
// Scan for port
char *portpos = NULL, *ptr = string;
while (*ptr)
{
if (*ptr == ':')
portpos = ptr;
++ptr;
}
if (portpos == NULL)
return 0; // No port in string
// Consider IP being surrounded by [ ]
if (*string == '[' && *(portpos - 1) == ']')
{
++string;
*(portpos - 1) = '\0';
}
*portpos++ = '\0';
int p = atoi(portpos);
if (p < 1 || p > 65535)
return 0; // Invalid port
host->port = htons((uint16_t)p);
// Try IPv4 with port
if (1 == inet_pton(AF_INET, string, &v4))
{
host->type = AF_INET;
memcpy(host->addr, &v4, 4);
return 1;
}
// Try IPv6 with port
if (1 == inet_pton(AF_INET6, string, &v6))
{
host->type = AF_INET6;
memcpy(host->addr, &v6, 16);
return 1;
}
// FAIL
return 0;
}
static void dnbd3_get_ip(char *hostname, dnbd3_host_t *host)
{
if (parse_address(hostname, host))
return;
// TODO: Parse port too for host names
struct hostent *hent;
if ((hent = gethostbyname(hostname)) == NULL)
{
printf("FATAL: Unknown host '%s'\n", hostname);
exit(EXIT_FAILURE);
}
host->type = (uint8_t)hent->h_addrtype;
if (hent->h_addrtype == AF_INET)
memcpy(host->addr, hent->h_addr, 4);
else if (hent->h_addrtype == AF_INET6)
memcpy(host->addr, hent->h_addr, 16);
else
{
printf("FATAL: Unknown address type: %d\n", hent->h_addrtype);
exit(EXIT_FAILURE);
}
host->port = htons(PORT);
}
int main(int argc, char *argv[])
{
int fd;
char *dev = NULL;
int close_dev = 0;
int switch_host = 0;
dnbd3_ioctl_t msg;
memset(&msg, 0, sizeof(dnbd3_ioctl_t));
msg.len = (uint16_t)sizeof(dnbd3_ioctl_t);
msg.read_ahead_kb = DEFAULT_READ_AHEAD_KB;
msg.host.port = htons(PORT);
msg.host.type = 0;
msg.imgname = NULL;
msg.is_server = FALSE;
int opt = 0;
int longIndex = 0;
static const char *optString = "f:h:i:r:d:a:c:s:HV?";
static const struct option longOpts[] =
{
{ "file", required_argument, NULL, 'f' },
{ "host", required_argument, NULL, 'h' },
{ "image", required_argument, NULL, 'i' },
{ "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':
break;
case 'h':
dnbd3_get_ip(optarg, &msg.host);
break;
case 'i':
msg.imgname = strdup(optarg);
printf("Image: %s\n", msg.imgname);
break;
case 'r':
msg.rid = atoi(optarg);
break;
case 'd':
dev = strdup(optarg);
printf("Device is %s\n", dev);
break;
case 'a':
msg.read_ahead_kb = atoi(optarg);
break;
case 'c':
dev = strdup(optarg);
close_dev = 1;
break;
case 's':
dnbd3_get_ip(optarg, &msg.host);
switch_host = 1;
break;
case 'H':
dnbd3_print_help(argv[0]);
break;
case 'V':
dnbd3_print_version();
break;
case '?':
dnbd3_print_help(argv[0]);
break;
}
opt = getopt_long(argc, argv, optString, longOpts, &longIndex);
}
// close device
if (close_dev && msg.host.type == 0 && dev && (msg.imgname == NULL))
{
fd = open(dev, O_WRONLY);
printf("INFO: Closing device %s\n", dev);
const int ret = ioctl(fd, IOCTL_CLOSE, &msg);
if (ret < 0)
{
printf("ERROR: ioctl not successful (close, %s (%d))\n", strerror(-ret), ret);
exit(EXIT_FAILURE);
}
close(fd);
exit(EXIT_SUCCESS);
}
// switch host
if (switch_host && msg.host.type != 0 && dev && (msg.imgname == NULL))
{
fd = open(dev, O_WRONLY);
printf("INFO: Switching device %s to %s\n", dev, "<fixme>");
const int ret = ioctl(fd, IOCTL_SWITCH, &msg);
if (ret < 0)
{
printf("ERROR: ioctl not successful (switch, %s (%d))\n", strerror(-ret), ret);
exit(EXIT_FAILURE);
}
close(fd);
exit(EXIT_SUCCESS);
}
// connect
if (msg.host.type != 0 && dev && (msg.imgname != NULL))
{
msg.imgnamelen = (uint16_t)strlen(msg.imgname);
fd = open(dev, O_WRONLY);
printf("INFO: Connecting %s to %s (%s rid:%i)\n", dev, "<fixme>", msg.imgname, msg.rid);
const int ret = ioctl(fd, IOCTL_OPEN, &msg);
if (ret < 0)
{
printf("ERROR: ioctl not successful (connect, %s (%d))\n", strerror(-ret), ret);
exit(EXIT_FAILURE);
}
close(fd);
exit(EXIT_SUCCESS);
}
dnbd3_print_help(argv[0]);
exit(EXIT_FAILURE);
}
