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