1cd831bd7Sths /* 27a5ca864Sbellard * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> 37a5ca864Sbellard * 47a5ca864Sbellard * Network Block Device 57a5ca864Sbellard * 67a5ca864Sbellard * This program is free software; you can redistribute it and/or modify 77a5ca864Sbellard * it under the terms of the GNU General Public License as published by 87a5ca864Sbellard * the Free Software Foundation; under version 2 of the License. 97a5ca864Sbellard * 107a5ca864Sbellard * This program is distributed in the hope that it will be useful, 117a5ca864Sbellard * but WITHOUT ANY WARRANTY; without even the implied warranty of 127a5ca864Sbellard * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 137a5ca864Sbellard * GNU General Public License for more details. 147a5ca864Sbellard * 157a5ca864Sbellard * You should have received a copy of the GNU General Public License 168167ee88SBlue Swirl * along with this program; if not, see <http://www.gnu.org/licenses/>. 177a5ca864Sbellard */ 187a5ca864Sbellard 195a61cb60SStefan Weil #include "qemu-common.h" 2038ceff04SPaolo Bonzini #include "block.h" 217a5ca864Sbellard #include "nbd.h" 227a5ca864Sbellard 237a5ca864Sbellard #include <stdarg.h> 247a5ca864Sbellard #include <stdio.h> 257a5ca864Sbellard #include <getopt.h> 267a5ca864Sbellard #include <err.h> 27cd831bd7Sths #include <sys/types.h> 287a5ca864Sbellard #include <sys/socket.h> 297a5ca864Sbellard #include <netinet/in.h> 307a5ca864Sbellard #include <netinet/tcp.h> 317a5ca864Sbellard #include <arpa/inet.h> 32cd831bd7Sths #include <signal.h> 332bff4b6fSBlue Swirl #include <libgen.h> 34a517e88bSPaolo Bonzini #include <pthread.h> 35cd831bd7Sths 36cd831bd7Sths #define SOCKET_PATH "/var/lock/qemu-nbd-%s" 377a5ca864Sbellard 38af49bbbeSPaolo Bonzini static NBDExport *exp; 39b1d8e52eSblueswir1 static int verbose; 40a517e88bSPaolo Bonzini static char *srcpath; 41a517e88bSPaolo Bonzini static char *sockpath; 42a61c6782SPaolo Bonzini static bool sigterm_reported; 43a61c6782SPaolo Bonzini static bool nbd_started; 44a61c6782SPaolo Bonzini static int shared = 1; 45a61c6782SPaolo Bonzini static int nb_fds; 467a5ca864Sbellard 477a5ca864Sbellard static void usage(const char *name) 487a5ca864Sbellard { 49*b033cd86SPaolo Bonzini (printf) ( 507a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 517a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 527a5ca864Sbellard "\n" 537a5ca864Sbellard " -h, --help display this help and exit\n" 547a5ca864Sbellard " -V, --version output version information and exit\n" 557a5ca864Sbellard "\n" 56*b033cd86SPaolo Bonzini "Connection properties:\n" 57*b033cd86SPaolo Bonzini " -p, --port=PORT port to listen on (default `%d')\n" 58*b033cd86SPaolo Bonzini " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 59*b033cd86SPaolo Bonzini " -k, --socket=PATH path to the unix socket\n" 60*b033cd86SPaolo Bonzini " (default '"SOCKET_PATH"')\n" 61*b033cd86SPaolo Bonzini " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 62*b033cd86SPaolo Bonzini " -t, --persistent don't exit on the last connection\n" 63*b033cd86SPaolo Bonzini " -v, --verbose display extra debugging information\n" 64*b033cd86SPaolo Bonzini "\n" 65*b033cd86SPaolo Bonzini "Exposing part of the image:\n" 66*b033cd86SPaolo Bonzini " -o, --offset=OFFSET offset into the image\n" 67*b033cd86SPaolo Bonzini " -P, --partition=NUM only expose partition NUM\n" 68*b033cd86SPaolo Bonzini "\n" 69*b033cd86SPaolo Bonzini #ifdef __linux__ 70*b033cd86SPaolo Bonzini "Kernel NBD client support:\n" 71*b033cd86SPaolo Bonzini " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 72*b033cd86SPaolo Bonzini " -d, --disconnect disconnect the specified device\n" 73*b033cd86SPaolo Bonzini "\n" 74*b033cd86SPaolo Bonzini #endif 75*b033cd86SPaolo Bonzini "\n" 76*b033cd86SPaolo Bonzini "Block device options:\n" 77*b033cd86SPaolo Bonzini " -r, --read-only export read-only\n" 78*b033cd86SPaolo Bonzini " -s, --snapshot use snapshot file\n" 79*b033cd86SPaolo Bonzini " -n, --nocache disable host cache\n" 80*b033cd86SPaolo Bonzini "\n" 81*b033cd86SPaolo Bonzini "Report bugs to <qemu-devel@nongnu.org>\n" 82c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 837a5ca864Sbellard } 847a5ca864Sbellard 857a5ca864Sbellard static void version(const char *name) 867a5ca864Sbellard { 877a5ca864Sbellard printf( 88315bc7aaSths "%s version 0.0.1\n" 897a5ca864Sbellard "Written by Anthony Liguori.\n" 907a5ca864Sbellard "\n" 917a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 927a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 937a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 94315bc7aaSths , name); 957a5ca864Sbellard } 967a5ca864Sbellard 977a5ca864Sbellard struct partition_record 987a5ca864Sbellard { 997a5ca864Sbellard uint8_t bootable; 1007a5ca864Sbellard uint8_t start_head; 1017a5ca864Sbellard uint32_t start_cylinder; 1027a5ca864Sbellard uint8_t start_sector; 1037a5ca864Sbellard uint8_t system; 1047a5ca864Sbellard uint8_t end_head; 1057a5ca864Sbellard uint8_t end_cylinder; 1067a5ca864Sbellard uint8_t end_sector; 1077a5ca864Sbellard uint32_t start_sector_abs; 1087a5ca864Sbellard uint32_t nb_sectors_abs; 1097a5ca864Sbellard }; 1107a5ca864Sbellard 1117a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1127a5ca864Sbellard { 1137a5ca864Sbellard r->bootable = p[0]; 1147a5ca864Sbellard r->start_head = p[1]; 1157a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1167a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1177a5ca864Sbellard r->system = p[4]; 1187a5ca864Sbellard r->end_head = p[5]; 1197a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1207a5ca864Sbellard r->end_sector = p[6] & 0x3f; 1217a5ca864Sbellard r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; 1227a5ca864Sbellard r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; 1237a5ca864Sbellard } 1247a5ca864Sbellard 1257a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition, 1267a5ca864Sbellard off_t *offset, off_t *size) 1277a5ca864Sbellard { 1287a5ca864Sbellard struct partition_record mbr[4]; 1297a5ca864Sbellard uint8_t data[512]; 1307a5ca864Sbellard int i; 1317a5ca864Sbellard int ext_partnum = 4; 132cb7cf0e3SRyota Ozaki int ret; 1337a5ca864Sbellard 134cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { 135cb7cf0e3SRyota Ozaki errno = -ret; 136cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 137cb7cf0e3SRyota Ozaki } 1387a5ca864Sbellard 1397a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 140185b4338SPaolo Bonzini return -EINVAL; 1417a5ca864Sbellard } 1427a5ca864Sbellard 1437a5ca864Sbellard for (i = 0; i < 4; i++) { 1447a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1457a5ca864Sbellard 1467a5ca864Sbellard if (!mbr[i].nb_sectors_abs) 1477a5ca864Sbellard continue; 1487a5ca864Sbellard 1497a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1507a5ca864Sbellard struct partition_record ext[4]; 1517a5ca864Sbellard uint8_t data1[512]; 1527a5ca864Sbellard int j; 1537a5ca864Sbellard 154cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { 155cb7cf0e3SRyota Ozaki errno = -ret; 156cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 157cb7cf0e3SRyota Ozaki } 1587a5ca864Sbellard 1597a5ca864Sbellard for (j = 0; j < 4; j++) { 1607a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 1617a5ca864Sbellard if (!ext[j].nb_sectors_abs) 1627a5ca864Sbellard continue; 1637a5ca864Sbellard 1647a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1657a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1667a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1677a5ca864Sbellard return 0; 1687a5ca864Sbellard } 1697a5ca864Sbellard } 1707a5ca864Sbellard ext_partnum += 4; 1717a5ca864Sbellard } else if ((i + 1) == partition) { 1727a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 1737a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 1747a5ca864Sbellard return 0; 1757a5ca864Sbellard } 1767a5ca864Sbellard } 1777a5ca864Sbellard 178185b4338SPaolo Bonzini return -ENOENT; 1797a5ca864Sbellard } 1807a5ca864Sbellard 181bb345110SPaolo Bonzini static void termsig_handler(int signum) 182bb345110SPaolo Bonzini { 183a61c6782SPaolo Bonzini sigterm_reported = true; 184a61c6782SPaolo Bonzini qemu_notify_event(); 185bb345110SPaolo Bonzini } 186bb345110SPaolo Bonzini 187a517e88bSPaolo Bonzini static void *show_parts(void *arg) 188cd831bd7Sths { 189a6ac2313SPaolo Bonzini char *device = arg; 190cd831bd7Sths int nbd; 191cd831bd7Sths 192cd831bd7Sths /* linux just needs an open() to trigger 193cd831bd7Sths * the partition table update 194cd831bd7Sths * but remember to load the module with max_part != 0 : 195cd831bd7Sths * modprobe nbd max_part=63 196cd831bd7Sths */ 197cd831bd7Sths nbd = open(device, O_RDWR); 198fc19f8a0SPaolo Bonzini if (nbd >= 0) { 199cd831bd7Sths close(nbd); 200cd831bd7Sths } 201a517e88bSPaolo Bonzini return NULL; 202a517e88bSPaolo Bonzini } 203a517e88bSPaolo Bonzini 204a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 205a517e88bSPaolo Bonzini { 206a6ac2313SPaolo Bonzini char *device = arg; 207a517e88bSPaolo Bonzini off_t size; 208a517e88bSPaolo Bonzini size_t blocksize; 209a517e88bSPaolo Bonzini uint32_t nbdflags; 210a6ac2313SPaolo Bonzini int fd, sock; 211a517e88bSPaolo Bonzini int ret; 212a517e88bSPaolo Bonzini pthread_t show_parts_thread; 213a517e88bSPaolo Bonzini 214a517e88bSPaolo Bonzini sock = unix_socket_outgoing(sockpath); 215fc19f8a0SPaolo Bonzini if (sock < 0) { 216a517e88bSPaolo Bonzini goto out; 217a517e88bSPaolo Bonzini } 218a517e88bSPaolo Bonzini 219a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 220a517e88bSPaolo Bonzini &size, &blocksize); 221fc19f8a0SPaolo Bonzini if (ret < 0) { 222a517e88bSPaolo Bonzini goto out; 223a517e88bSPaolo Bonzini } 224a517e88bSPaolo Bonzini 225a6ac2313SPaolo Bonzini fd = open(device, O_RDWR); 226fc19f8a0SPaolo Bonzini if (fd < 0) { 227a6ac2313SPaolo Bonzini /* Linux-only, we can use %m in printf. */ 228a6ac2313SPaolo Bonzini fprintf(stderr, "Failed to open %s: %m", device); 229a6ac2313SPaolo Bonzini goto out; 230a6ac2313SPaolo Bonzini } 231a6ac2313SPaolo Bonzini 232a517e88bSPaolo Bonzini ret = nbd_init(fd, sock, nbdflags, size, blocksize); 233fc19f8a0SPaolo Bonzini if (ret < 0) { 234a517e88bSPaolo Bonzini goto out; 235a517e88bSPaolo Bonzini } 236a517e88bSPaolo Bonzini 237a517e88bSPaolo Bonzini /* update partition table */ 238a6ac2313SPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, device); 239a517e88bSPaolo Bonzini 240c1f8fdc3SPaolo Bonzini if (verbose) { 241a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 242a517e88bSPaolo Bonzini device, srcpath); 243c1f8fdc3SPaolo Bonzini } else { 244c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 245c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 246c1f8fdc3SPaolo Bonzini } 247a517e88bSPaolo Bonzini 248a517e88bSPaolo Bonzini ret = nbd_client(fd); 249a517e88bSPaolo Bonzini if (ret) { 250a517e88bSPaolo Bonzini goto out; 251a517e88bSPaolo Bonzini } 252a517e88bSPaolo Bonzini close(fd); 253a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 254a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 255a517e88bSPaolo Bonzini 256a517e88bSPaolo Bonzini out: 257a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 258a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 259cd831bd7Sths } 260cd831bd7Sths 261a61c6782SPaolo Bonzini static int nbd_can_accept(void *opaque) 262a61c6782SPaolo Bonzini { 263a61c6782SPaolo Bonzini return nb_fds < shared; 264a61c6782SPaolo Bonzini } 265a61c6782SPaolo Bonzini 2661743b515SPaolo Bonzini static void nbd_client_closed(NBDClient *client) 267a61c6782SPaolo Bonzini { 268a61c6782SPaolo Bonzini nb_fds--; 2691743b515SPaolo Bonzini qemu_notify_event(); 270a61c6782SPaolo Bonzini } 271a61c6782SPaolo Bonzini 272a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 273a61c6782SPaolo Bonzini { 274a61c6782SPaolo Bonzini int server_fd = (uintptr_t) opaque; 275a61c6782SPaolo Bonzini struct sockaddr_in addr; 276a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 277a61c6782SPaolo Bonzini 278a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 279a61c6782SPaolo Bonzini nbd_started = true; 280fc19f8a0SPaolo Bonzini if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) { 281a61c6782SPaolo Bonzini nb_fds++; 282a61c6782SPaolo Bonzini } 283a61c6782SPaolo Bonzini } 284a61c6782SPaolo Bonzini 2857a5ca864Sbellard int main(int argc, char **argv) 2867a5ca864Sbellard { 2877a5ca864Sbellard BlockDriverState *bs; 2887a5ca864Sbellard off_t dev_offset = 0; 289b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 290cd831bd7Sths bool disconnect = false; 2917a5ca864Sbellard const char *bindto = "0.0.0.0"; 292a6ac2313SPaolo Bonzini char *device = NULL; 293c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 2947a5ca864Sbellard off_t fd_size; 295d6aa671fSaliguori const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; 2967a5ca864Sbellard struct option lopt[] = { 297660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 298660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 299660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 300660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 301660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 302660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 303660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 304660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 305660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 306660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 307660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 308660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 309660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 310660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 311660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 312660f11beSBlue Swirl { NULL, 0, NULL, 0 } 3137a5ca864Sbellard }; 3147a5ca864Sbellard int ch; 3157a5ca864Sbellard int opt_ind = 0; 3167a5ca864Sbellard int li; 3177a5ca864Sbellard char *end; 318f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 3197a5ca864Sbellard int partition = -1; 320cd831bd7Sths int ret; 3213b05a8e9Sths int fd; 32275818250Sths int persistent = 0; 323a517e88bSPaolo Bonzini pthread_t client_thread; 3247a5ca864Sbellard 325a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 326a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 327a517e88bSPaolo Bonzini */ 328bb345110SPaolo Bonzini struct sigaction sa_sigterm; 329bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 330bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 331bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 332bb345110SPaolo Bonzini 3337a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 3347a5ca864Sbellard switch (ch) { 3357a5ca864Sbellard case 's': 3362f726488Sths flags |= BDRV_O_SNAPSHOT; 3372f726488Sths break; 3382f726488Sths case 'n': 339a6599793SChristoph Hellwig flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; 3407a5ca864Sbellard break; 3417a5ca864Sbellard case 'b': 3427a5ca864Sbellard bindto = optarg; 3437a5ca864Sbellard break; 3447a5ca864Sbellard case 'p': 3457a5ca864Sbellard li = strtol(optarg, &end, 0); 3467a5ca864Sbellard if (*end) { 347b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 3487a5ca864Sbellard } 3497a5ca864Sbellard if (li < 1 || li > 65535) { 350b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 3517a5ca864Sbellard } 3527a5ca864Sbellard port = (uint16_t)li; 3537a5ca864Sbellard break; 3547a5ca864Sbellard case 'o': 3557a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 3567a5ca864Sbellard if (*end) { 357b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 3587a5ca864Sbellard } 3597a5ca864Sbellard if (dev_offset < 0) { 360b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 3617a5ca864Sbellard } 3627a5ca864Sbellard break; 3637a5ca864Sbellard case 'r': 364b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 36507108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 3667a5ca864Sbellard break; 3677a5ca864Sbellard case 'P': 3687a5ca864Sbellard partition = strtol(optarg, &end, 0); 3697a5ca864Sbellard if (*end) 370b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 3717a5ca864Sbellard if (partition < 1 || partition > 8) 372b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 3737a5ca864Sbellard break; 374cd831bd7Sths case 'k': 375b32f6c28SPaolo Bonzini sockpath = optarg; 376b32f6c28SPaolo Bonzini if (sockpath[0] != '/') 377b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 378cd831bd7Sths break; 379cd831bd7Sths case 'd': 380cd831bd7Sths disconnect = true; 381cd831bd7Sths break; 382cd831bd7Sths case 'c': 383cd831bd7Sths device = optarg; 384cd831bd7Sths break; 3853b05a8e9Sths case 'e': 3863b05a8e9Sths shared = strtol(optarg, &end, 0); 3873b05a8e9Sths if (*end) { 388b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 3893b05a8e9Sths } 3903b05a8e9Sths if (shared < 1) { 391b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 3923b05a8e9Sths } 3933b05a8e9Sths break; 39475818250Sths case 't': 39575818250Sths persistent = 1; 39675818250Sths break; 3977a5ca864Sbellard case 'v': 3987a5ca864Sbellard verbose = 1; 3997a5ca864Sbellard break; 4007a5ca864Sbellard case 'V': 4017a5ca864Sbellard version(argv[0]); 4027a5ca864Sbellard exit(0); 4037a5ca864Sbellard break; 4047a5ca864Sbellard case 'h': 4057a5ca864Sbellard usage(argv[0]); 4067a5ca864Sbellard exit(0); 4077a5ca864Sbellard break; 4087a5ca864Sbellard case '?': 409b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 4107a5ca864Sbellard argv[0]); 4117a5ca864Sbellard } 4127a5ca864Sbellard } 4137a5ca864Sbellard 4147a5ca864Sbellard if ((argc - optind) != 1) { 415b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 4167a5ca864Sbellard "Try `%s --help' for more information.", 4177a5ca864Sbellard argv[0]); 4187a5ca864Sbellard } 4197a5ca864Sbellard 420cd831bd7Sths if (disconnect) { 421cd831bd7Sths fd = open(argv[optind], O_RDWR); 422fc19f8a0SPaolo Bonzini if (fd < 0) { 423cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 424fc19f8a0SPaolo Bonzini } 425cd831bd7Sths nbd_disconnect(fd); 426cd831bd7Sths 427cd831bd7Sths close(fd); 428cd831bd7Sths 429cd831bd7Sths printf("%s disconnected\n", argv[optind]); 430cd831bd7Sths 431cd831bd7Sths return 0; 432cd831bd7Sths } 433cd831bd7Sths 434c1f8fdc3SPaolo Bonzini if (device && !verbose) { 435c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 436c1f8fdc3SPaolo Bonzini pid_t pid; 437c1f8fdc3SPaolo Bonzini int ret; 438c1f8fdc3SPaolo Bonzini 439fc19f8a0SPaolo Bonzini if (qemu_pipe(stderr_fd) < 0) { 440c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 441c1f8fdc3SPaolo Bonzini } 442c1f8fdc3SPaolo Bonzini 443c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 444c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 445c1f8fdc3SPaolo Bonzini */ 446c1f8fdc3SPaolo Bonzini pid = fork(); 447c1f8fdc3SPaolo Bonzini if (pid == 0) { 448c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 4499faf31b6SMichael Tokarev ret = qemu_daemon(1, 0); 450c1f8fdc3SPaolo Bonzini 451c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 452c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 453fc19f8a0SPaolo Bonzini if (ret < 0) { 454c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 455c1f8fdc3SPaolo Bonzini } 456c1f8fdc3SPaolo Bonzini 457c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 458c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 459c1f8fdc3SPaolo Bonzini } else { 460c1f8fdc3SPaolo Bonzini bool errors = false; 461c1f8fdc3SPaolo Bonzini char *buf; 462c1f8fdc3SPaolo Bonzini 463c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 464c1f8fdc3SPaolo Bonzini * it closes the pipe. 465c1f8fdc3SPaolo Bonzini */ 466c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 467c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 468c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 469c1f8fdc3SPaolo Bonzini errors = true; 470c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 471fc19f8a0SPaolo Bonzini if (ret < 0) { 472c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 473c1f8fdc3SPaolo Bonzini } 474c1f8fdc3SPaolo Bonzini } 475fc19f8a0SPaolo Bonzini if (ret < 0) { 476c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 477c1f8fdc3SPaolo Bonzini } 478c1f8fdc3SPaolo Bonzini 479c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 480c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 481c1f8fdc3SPaolo Bonzini */ 482c1f8fdc3SPaolo Bonzini exit(errors); 483c1f8fdc3SPaolo Bonzini } 484c1f8fdc3SPaolo Bonzini } 485c1f8fdc3SPaolo Bonzini 486a6ac2313SPaolo Bonzini if (device != NULL && sockpath == NULL) { 487b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 488b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 489cd831bd7Sths } 490cd831bd7Sths 491802ddc37SPaolo Bonzini bdrv_init(); 492802ddc37SPaolo Bonzini atexit(bdrv_close_all); 493802ddc37SPaolo Bonzini 494802ddc37SPaolo Bonzini bs = bdrv_new("hda"); 495802ddc37SPaolo Bonzini srcpath = argv[optind]; 496802ddc37SPaolo Bonzini if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { 497802ddc37SPaolo Bonzini errno = -ret; 498802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]); 499802ddc37SPaolo Bonzini } 500802ddc37SPaolo Bonzini 50138ceff04SPaolo Bonzini fd_size = bdrv_getlength(bs); 502802ddc37SPaolo Bonzini 503185b4338SPaolo Bonzini if (partition != -1) { 504185b4338SPaolo Bonzini ret = find_partition(bs, partition, &dev_offset, &fd_size); 505185b4338SPaolo Bonzini if (ret < 0) { 506185b4338SPaolo Bonzini errno = -ret; 507802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Could not find partition %d", partition); 508802ddc37SPaolo Bonzini } 509185b4338SPaolo Bonzini } 510802ddc37SPaolo Bonzini 511af49bbbeSPaolo Bonzini exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags); 5123b05a8e9Sths 513b32f6c28SPaolo Bonzini if (sockpath) { 514a61c6782SPaolo Bonzini fd = unix_socket_incoming(sockpath); 515cd831bd7Sths } else { 516a61c6782SPaolo Bonzini fd = tcp_socket_incoming(bindto, port); 517cd831bd7Sths } 518cd831bd7Sths 519fc19f8a0SPaolo Bonzini if (fd < 0) { 5207a5ca864Sbellard return 1; 521a61c6782SPaolo Bonzini } 522f1ef5555SPaolo Bonzini 523f1ef5555SPaolo Bonzini if (device) { 524f1ef5555SPaolo Bonzini int ret; 525f1ef5555SPaolo Bonzini 526a6ac2313SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); 527f1ef5555SPaolo Bonzini if (ret != 0) { 528f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 529f1ef5555SPaolo Bonzini strerror(ret)); 530f1ef5555SPaolo Bonzini } 531f1ef5555SPaolo Bonzini } else { 532f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 533f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 534f1ef5555SPaolo Bonzini } 535f1ef5555SPaolo Bonzini 536a61c6782SPaolo Bonzini qemu_init_main_loop(); 537a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, 538a61c6782SPaolo Bonzini (void *)(uintptr_t)fd); 5397a5ca864Sbellard 5409faf31b6SMichael Tokarev /* now when the initialization is (almost) complete, chdir("/") 5419faf31b6SMichael Tokarev * to free any busy filesystems */ 5429faf31b6SMichael Tokarev if (chdir("/") < 0) { 5439faf31b6SMichael Tokarev err(EXIT_FAILURE, "Could not chdir to root directory"); 5449faf31b6SMichael Tokarev } 5459faf31b6SMichael Tokarev 5463b05a8e9Sths do { 547a61c6782SPaolo Bonzini main_loop_wait(false); 548a61c6782SPaolo Bonzini } while (!sigterm_reported && (persistent || !nbd_started || nb_fds > 0)); 5493b05a8e9Sths 550af49bbbeSPaolo Bonzini nbd_export_close(exp); 551b32f6c28SPaolo Bonzini if (sockpath) { 552b32f6c28SPaolo Bonzini unlink(sockpath); 553b32f6c28SPaolo Bonzini } 5547a5ca864Sbellard 555a517e88bSPaolo Bonzini if (device) { 556a517e88bSPaolo Bonzini void *ret; 557a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 558a517e88bSPaolo Bonzini exit(ret != NULL); 559a517e88bSPaolo Bonzini } else { 560a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 561a517e88bSPaolo Bonzini } 5627a5ca864Sbellard } 563