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-rw-r--r--qemu-nbd.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/qemu-nbd.c b/qemu-nbd.c
new file mode 100644
index 0000000000..3fb3d0c70d
--- /dev/null
+++ b/qemu-nbd.c
@@ -0,0 +1,275 @@
+/*\
+ * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
+ *
+ * Network Block Device
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <qemu-common.h>
+#include "block_int.h"
+#include "nbd.h"
+
+#include <malloc.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <err.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+
+int verbose;
+
+static void usage(const char *name)
+{
+ printf(
+"Usage: %s [OPTIONS] FILE\n"
+"QEMU Disk Network Block Device Server\n"
+"\n"
+" -p, --port=PORT port to listen on (default `1024')\n"
+" -o, --offset=OFFSET offset into the image\n"
+" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
+" -r, --read-only export read-only\n"
+" -P, --partition=NUM only expose partition NUM\n"
+" -v, --verbose display extra debugging information\n"
+" -h, --help display this help and exit\n"
+" -V, --version output version information and exit\n"
+"\n"
+"Report bugs to <anthony@codemonkey.ws>\n"
+ , name);
+}
+
+static void version(const char *name)
+{
+ printf(
+"qemu-nbd version 0.0.1\n"
+"Written by Anthony Liguori.\n"
+"\n"
+"Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
+"This is free software; see the source for copying conditions. There is NO\n"
+"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
+ );
+}
+
+struct partition_record
+{
+ uint8_t bootable;
+ uint8_t start_head;
+ uint32_t start_cylinder;
+ uint8_t start_sector;
+ uint8_t system;
+ uint8_t end_head;
+ uint8_t end_cylinder;
+ uint8_t end_sector;
+ uint32_t start_sector_abs;
+ uint32_t nb_sectors_abs;
+};
+
+static void read_partition(uint8_t *p, struct partition_record *r)
+{
+ r->bootable = p[0];
+ r->start_head = p[1];
+ r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
+ r->start_sector = p[2] & 0x3f;
+ r->system = p[4];
+ r->end_head = p[5];
+ r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
+ r->end_sector = p[6] & 0x3f;
+ r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24;
+ r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24;
+}
+
+static int find_partition(BlockDriverState *bs, int partition,
+ off_t *offset, off_t *size)
+{
+ struct partition_record mbr[4];
+ uint8_t data[512];
+ int i;
+ int ext_partnum = 4;
+
+ if (bdrv_read(bs, 0, data, 1))
+ errx(EINVAL, "error while reading");
+
+ if (data[510] != 0x55 || data[511] != 0xaa) {
+ errno = -EINVAL;
+ return -1;
+ }
+
+ for (i = 0; i < 4; i++) {
+ read_partition(&data[446 + 16 * i], &mbr[i]);
+
+ if (!mbr[i].nb_sectors_abs)
+ continue;
+
+ if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
+ struct partition_record ext[4];
+ uint8_t data1[512];
+ int j;
+
+ if (bdrv_read(bs, mbr[i].start_sector_abs, data1, 1))
+ errx(EINVAL, "error while reading");
+
+ for (j = 0; j < 4; j++) {
+ read_partition(&data1[446 + 16 * j], &ext[j]);
+ if (!ext[j].nb_sectors_abs)
+ continue;
+
+ if ((ext_partnum + j + 1) == partition) {
+ *offset = (uint64_t)ext[j].start_sector_abs << 9;
+ *size = (uint64_t)ext[j].nb_sectors_abs << 9;
+ return 0;
+ }
+ }
+ ext_partnum += 4;
+ } else if ((i + 1) == partition) {
+ *offset = (uint64_t)mbr[i].start_sector_abs << 9;
+ *size = (uint64_t)mbr[i].nb_sectors_abs << 9;
+ return 0;
+ }
+ }
+
+ errno = -ENOENT;
+ return -1;
+}
+
+int main(int argc, char **argv)
+{
+ BlockDriverState *bs;
+ off_t dev_offset = 0;
+ off_t offset = 0;
+ bool readonly = false;
+ const char *bindto = "0.0.0.0";
+ int port = 1024;
+ int sock, csock;
+ struct sockaddr_in addr;
+ socklen_t addr_len = sizeof(addr);
+ off_t fd_size;
+ const char *sopt = "hVbo:p:rsP:v";
+ struct option lopt[] = {
+ { "help", 0, 0, 'h' },
+ { "version", 0, 0, 'V' },
+ { "bind", 1, 0, 'b' },
+ { "port", 1, 0, 'p' },
+ { "offset", 1, 0, 'o' },
+ { "read-only", 0, 0, 'r' },
+ { "partition", 1, 0, 'P' },
+ { "snapshot", 0, 0, 's' },
+ { "verbose", 0, 0, 'v' },
+ };
+ int ch;
+ int opt_ind = 0;
+ int li;
+ char *end;
+ bool snapshot = false;
+ int partition = -1;
+
+ while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
+ switch (ch) {
+ case 's':
+ snapshot = true;
+ break;
+ case 'b':
+ bindto = optarg;
+ break;
+ case 'p':
+ li = strtol(optarg, &end, 0);
+ if (*end) {
+ errx(EINVAL, "Invalid port `%s'", optarg);
+ }
+ if (li < 1 || li > 65535) {
+ errx(EINVAL, "Port out of range `%s'", optarg);
+ }
+ port = (uint16_t)li;
+ break;
+ case 'o':
+ dev_offset = strtoll (optarg, &end, 0);
+ if (*end) {
+ errx(EINVAL, "Invalid offset `%s'", optarg);
+ }
+ if (dev_offset < 0) {
+ errx(EINVAL, "Offset must be positive `%s'", optarg);
+ }
+ break;
+ case 'r':
+ readonly = true;
+ break;
+ case 'P':
+ partition = strtol(optarg, &end, 0);
+ if (*end)
+ errx(EINVAL, "Invalid partition `%s'", optarg);
+ if (partition < 1 || partition > 8)
+ errx(EINVAL, "Invalid partition %d", partition);
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ case 'V':
+ version(argv[0]);
+ exit(0);
+ break;
+ case 'h':
+ usage(argv[0]);
+ exit(0);
+ break;
+ case '?':
+ errx(EINVAL, "Try `%s --help' for more information.",
+ argv[0]);
+ }
+ }
+
+ if ((argc - optind) != 1) {
+ errx(EINVAL, "Invalid number of argument.\n"
+ "Try `%s --help' for more information.",
+ argv[0]);
+ }
+
+ bdrv_init();
+
+ bs = bdrv_new("hda");
+ if (bs == NULL)
+ return 1;
+
+ if (bdrv_open(bs, argv[optind], snapshot) == -1)
+ return 1;
+
+ fd_size = bs->total_sectors * 512;
+
+ if (partition != -1 &&
+ find_partition(bs, partition, &dev_offset, &fd_size))
+ errx(errno, "Could not find partition %d", partition);
+
+ sock = tcp_socket_incoming(bindto, port);
+ if (sock == -1)
+ return 1;
+
+ csock = accept(sock,
+ (struct sockaddr *)&addr,
+ &addr_len);
+ if (csock == -1)
+ return 1;
+
+ /* new fd_size is calculated by find_partition */
+ if (nbd_negotiate(bs, csock, fd_size) == -1)
+ return 1;
+
+ while (nbd_trip(bs, csock, fd_size, dev_offset, &offset, readonly) == 0);
+
+ close(csock);
+ close(sock);
+ bdrv_close(bs);
+
+ return 0;
+}
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