2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; under version 2 of the License.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <qemu-common.h>
21 #include "block_int.h"
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <netinet/tcp.h>
32 #include <arpa/inet.h>
35 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
39 static void usage(const char *name)
42 "Usage: %s [OPTIONS] FILE\n"
43 "QEMU Disk Network Block Device Server\n"
45 " -p, --port=PORT port to listen on (default `1024')\n"
46 " -o, --offset=OFFSET offset into the image\n"
47 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
48 " -k, --socket=PATH path to the unix socket\n"
49 " (default '"SOCKET_PATH"')\n"
50 " -r, --read-only export read-only\n"
51 " -P, --partition=NUM only expose partition NUM\n"
52 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
53 " -d, --disconnect disconnect the specified device\n"
54 " -v, --verbose display extra debugging information\n"
55 " -h, --help display this help and exit\n"
56 " -V, --version output version information and exit\n"
58 "Report bugs to <anthony@codemonkey.ws>\n"
62 static void version(const char *name)
65 "qemu-nbd version 0.0.1\n"
66 "Written by Anthony Liguori.\n"
68 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
69 "This is free software; see the source for copying conditions. There is NO\n"
70 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
74 struct partition_record
78 uint32_t start_cylinder;
84 uint32_t start_sector_abs;
85 uint32_t nb_sectors_abs;
88 static void read_partition(uint8_t *p, struct partition_record *r)
92 r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
93 r->start_sector = p[2] & 0x3f;
96 r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
97 r->end_sector = p[6] & 0x3f;
98 r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24;
99 r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24;
102 static int find_partition(BlockDriverState *bs, int partition,
103 off_t *offset, off_t *size)
105 struct partition_record mbr[4];
110 if (bdrv_read(bs, 0, data, 1))
111 errx(EINVAL, "error while reading");
113 if (data[510] != 0x55 || data[511] != 0xaa) {
118 for (i = 0; i < 4; i++) {
119 read_partition(&data[446 + 16 * i], &mbr[i]);
121 if (!mbr[i].nb_sectors_abs)
124 if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
125 struct partition_record ext[4];
129 if (bdrv_read(bs, mbr[i].start_sector_abs, data1, 1))
130 errx(EINVAL, "error while reading");
132 for (j = 0; j < 4; j++) {
133 read_partition(&data1[446 + 16 * j], &ext[j]);
134 if (!ext[j].nb_sectors_abs)
137 if ((ext_partnum + j + 1) == partition) {
138 *offset = (uint64_t)ext[j].start_sector_abs << 9;
139 *size = (uint64_t)ext[j].nb_sectors_abs << 9;
144 } else if ((i + 1) == partition) {
145 *offset = (uint64_t)mbr[i].start_sector_abs << 9;
146 *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
155 static void show_parts(const char *device)
160 /* linux just needs an open() to trigger
161 * the partition table update
162 * but remember to load the module with max_part != 0 :
163 * modprobe nbd max_part=63
165 nbd = open(device, O_RDWR);
172 int main(int argc, char **argv)
174 BlockDriverState *bs;
175 off_t dev_offset = 0;
177 bool readonly = false;
178 bool disconnect = false;
179 const char *bindto = "0.0.0.0";
182 struct sockaddr_in addr;
183 socklen_t addr_len = sizeof(addr);
188 const char *sopt = "hVbo:p:rsP:c:dvk:";
189 struct option lopt[] = {
190 { "help", 0, 0, 'h' },
191 { "version", 0, 0, 'V' },
192 { "bind", 1, 0, 'b' },
193 { "port", 1, 0, 'p' },
194 { "socket", 1, 0, 'k' },
195 { "offset", 1, 0, 'o' },
196 { "read-only", 0, 0, 'r' },
197 { "partition", 1, 0, 'P' },
198 { "connect", 1, 0, 'c' },
199 { "disconnect", 0, 0, 'd' },
200 { "snapshot", 0, 0, 's' },
201 { "verbose", 0, 0, 'v' },
208 bool snapshot = false;
213 while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
222 li = strtol(optarg, &end, 0);
224 errx(EINVAL, "Invalid port `%s'", optarg);
226 if (li < 1 || li > 65535) {
227 errx(EINVAL, "Port out of range `%s'", optarg);
232 dev_offset = strtoll (optarg, &end, 0);
234 errx(EINVAL, "Invalid offset `%s'", optarg);
236 if (dev_offset < 0) {
237 errx(EINVAL, "Offset must be positive `%s'", optarg);
244 partition = strtol(optarg, &end, 0);
246 errx(EINVAL, "Invalid partition `%s'", optarg);
247 if (partition < 1 || partition > 8)
248 errx(EINVAL, "Invalid partition %d", partition);
252 if (socket[0] != '/')
253 errx(EINVAL, "socket path must be absolute\n");
273 errx(EINVAL, "Try `%s --help' for more information.",
278 if ((argc - optind) != 1) {
279 errx(EINVAL, "Invalid number of argument.\n"
280 "Try `%s --help' for more information.",
285 fd = open(argv[optind], O_RDWR);
287 errx(errno, "Cannot open %s", argv[optind]);
293 printf("%s disconnected\n", argv[optind]);
300 bs = bdrv_new("hda");
304 if (bdrv_open(bs, argv[optind], snapshot) == -1)
307 fd_size = bs->total_sectors * 512;
309 if (partition != -1 &&
310 find_partition(bs, partition, &dev_offset, &fd_size))
311 errx(errno, "Could not find partition %d", partition);
316 daemon(0, 0); /* detach client and server */
318 if (socket == NULL) {
319 sprintf(sockpath, SOCKET_PATH, basename(device));
334 sock = unix_socket_outgoing(socket);
336 if (errno != ENOENT && errno != ECONNREFUSED)
338 sleep(1); /* wait children */
340 } while (sock == -1);
342 fd = open(device, O_RDWR);
348 ret = nbd_receive_negotiate(sock, &size, &blocksize);
354 ret = nbd_init(fd, sock, size, blocksize);
360 printf("NBD device %s is now connected to file %s\n",
361 device, argv[optind]);
363 /* update partition table */
367 nbd_client(fd, sock);
379 sock = unix_socket_incoming(socket);
381 sock = tcp_socket_incoming(bindto, port);
388 (struct sockaddr *)&addr,
393 /* new fd_size is calculated by find_partition */
394 if (nbd_negotiate(bs, csock, fd_size) == -1)
397 while (nbd_trip(bs, csock, fd_size, dev_offset, &offset, readonly) == 0);