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" 207a5ca864Sbellard #include "block_int.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 382f726488Sths #define NBD_BUFFER_SIZE (1024*1024) 392f726488Sths 40bb345110SPaolo Bonzini static int sigterm_wfd; 41b1d8e52eSblueswir1 static int verbose; 42a517e88bSPaolo Bonzini static char *device; 43a517e88bSPaolo Bonzini static char *srcpath; 44a517e88bSPaolo Bonzini static char *sockpath; 457a5ca864Sbellard 467a5ca864Sbellard static void usage(const char *name) 477a5ca864Sbellard { 487a5ca864Sbellard printf( 497a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 507a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 517a5ca864Sbellard "\n" 52c2e2872bSLaurent Vivier " -p, --port=PORT port to listen on (default `%d')\n" 537a5ca864Sbellard " -o, --offset=OFFSET offset into the image\n" 547a5ca864Sbellard " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 55cd831bd7Sths " -k, --socket=PATH path to the unix socket\n" 56cd831bd7Sths " (default '"SOCKET_PATH"')\n" 577a5ca864Sbellard " -r, --read-only export read-only\n" 587a5ca864Sbellard " -P, --partition=NUM only expose partition NUM\n" 592f726488Sths " -s, --snapshot use snapshot file\n" 602f726488Sths " -n, --nocache disable host cache\n" 61cd831bd7Sths " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 62cd831bd7Sths " -d, --disconnect disconnect the specified device\n" 633b05a8e9Sths " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 6475818250Sths " -t, --persistent don't exit on the last connection\n" 657a5ca864Sbellard " -v, --verbose display extra debugging information\n" 667a5ca864Sbellard " -h, --help display this help and exit\n" 677a5ca864Sbellard " -V, --version output version information and exit\n" 687a5ca864Sbellard "\n" 697a5ca864Sbellard "Report bugs to <anthony@codemonkey.ws>\n" 70c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 717a5ca864Sbellard } 727a5ca864Sbellard 737a5ca864Sbellard static void version(const char *name) 747a5ca864Sbellard { 757a5ca864Sbellard printf( 76315bc7aaSths "%s version 0.0.1\n" 777a5ca864Sbellard "Written by Anthony Liguori.\n" 787a5ca864Sbellard "\n" 797a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 807a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 817a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 82315bc7aaSths , name); 837a5ca864Sbellard } 847a5ca864Sbellard 857a5ca864Sbellard struct partition_record 867a5ca864Sbellard { 877a5ca864Sbellard uint8_t bootable; 887a5ca864Sbellard uint8_t start_head; 897a5ca864Sbellard uint32_t start_cylinder; 907a5ca864Sbellard uint8_t start_sector; 917a5ca864Sbellard uint8_t system; 927a5ca864Sbellard uint8_t end_head; 937a5ca864Sbellard uint8_t end_cylinder; 947a5ca864Sbellard uint8_t end_sector; 957a5ca864Sbellard uint32_t start_sector_abs; 967a5ca864Sbellard uint32_t nb_sectors_abs; 977a5ca864Sbellard }; 987a5ca864Sbellard 997a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1007a5ca864Sbellard { 1017a5ca864Sbellard r->bootable = p[0]; 1027a5ca864Sbellard r->start_head = p[1]; 1037a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1047a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1057a5ca864Sbellard r->system = p[4]; 1067a5ca864Sbellard r->end_head = p[5]; 1077a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1087a5ca864Sbellard r->end_sector = p[6] & 0x3f; 1097a5ca864Sbellard r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; 1107a5ca864Sbellard r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; 1117a5ca864Sbellard } 1127a5ca864Sbellard 1137a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition, 1147a5ca864Sbellard off_t *offset, off_t *size) 1157a5ca864Sbellard { 1167a5ca864Sbellard struct partition_record mbr[4]; 1177a5ca864Sbellard uint8_t data[512]; 1187a5ca864Sbellard int i; 1197a5ca864Sbellard int ext_partnum = 4; 120cb7cf0e3SRyota Ozaki int ret; 1217a5ca864Sbellard 122cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { 123cb7cf0e3SRyota Ozaki errno = -ret; 124cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 125cb7cf0e3SRyota Ozaki } 1267a5ca864Sbellard 1277a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 1287a5ca864Sbellard errno = -EINVAL; 1297a5ca864Sbellard return -1; 1307a5ca864Sbellard } 1317a5ca864Sbellard 1327a5ca864Sbellard for (i = 0; i < 4; i++) { 1337a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1347a5ca864Sbellard 1357a5ca864Sbellard if (!mbr[i].nb_sectors_abs) 1367a5ca864Sbellard continue; 1377a5ca864Sbellard 1387a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1397a5ca864Sbellard struct partition_record ext[4]; 1407a5ca864Sbellard uint8_t data1[512]; 1417a5ca864Sbellard int j; 1427a5ca864Sbellard 143cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { 144cb7cf0e3SRyota Ozaki errno = -ret; 145cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 146cb7cf0e3SRyota Ozaki } 1477a5ca864Sbellard 1487a5ca864Sbellard for (j = 0; j < 4; j++) { 1497a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 1507a5ca864Sbellard if (!ext[j].nb_sectors_abs) 1517a5ca864Sbellard continue; 1527a5ca864Sbellard 1537a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1547a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1557a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1567a5ca864Sbellard return 0; 1577a5ca864Sbellard } 1587a5ca864Sbellard } 1597a5ca864Sbellard ext_partnum += 4; 1607a5ca864Sbellard } else if ((i + 1) == partition) { 1617a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 1627a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 1637a5ca864Sbellard return 0; 1647a5ca864Sbellard } 1657a5ca864Sbellard } 1667a5ca864Sbellard 1677a5ca864Sbellard errno = -ENOENT; 1687a5ca864Sbellard return -1; 1697a5ca864Sbellard } 1707a5ca864Sbellard 171bb345110SPaolo Bonzini static void termsig_handler(int signum) 172bb345110SPaolo Bonzini { 173bb345110SPaolo Bonzini static int sigterm_reported; 174bb345110SPaolo Bonzini if (!sigterm_reported) { 175bb345110SPaolo Bonzini sigterm_reported = (write(sigterm_wfd, "", 1) == 1); 176bb345110SPaolo Bonzini } 177bb345110SPaolo Bonzini } 178bb345110SPaolo Bonzini 179a517e88bSPaolo Bonzini static void *show_parts(void *arg) 180cd831bd7Sths { 181cd831bd7Sths int nbd; 182cd831bd7Sths 183cd831bd7Sths /* linux just needs an open() to trigger 184cd831bd7Sths * the partition table update 185cd831bd7Sths * but remember to load the module with max_part != 0 : 186cd831bd7Sths * modprobe nbd max_part=63 187cd831bd7Sths */ 188cd831bd7Sths nbd = open(device, O_RDWR); 189a517e88bSPaolo Bonzini if (nbd != -1) { 190cd831bd7Sths close(nbd); 191cd831bd7Sths } 192a517e88bSPaolo Bonzini return NULL; 193a517e88bSPaolo Bonzini } 194a517e88bSPaolo Bonzini 195a517e88bSPaolo Bonzini static void *nbd_client_thread(void *arg) 196a517e88bSPaolo Bonzini { 197a517e88bSPaolo Bonzini int fd = *(int *)arg; 198a517e88bSPaolo Bonzini off_t size; 199a517e88bSPaolo Bonzini size_t blocksize; 200a517e88bSPaolo Bonzini uint32_t nbdflags; 201a517e88bSPaolo Bonzini int sock; 202a517e88bSPaolo Bonzini int ret; 203a517e88bSPaolo Bonzini pthread_t show_parts_thread; 204a517e88bSPaolo Bonzini 205a517e88bSPaolo Bonzini do { 206a517e88bSPaolo Bonzini sock = unix_socket_outgoing(sockpath); 207a517e88bSPaolo Bonzini if (sock == -1) { 208a517e88bSPaolo Bonzini goto out; 209a517e88bSPaolo Bonzini } 210a517e88bSPaolo Bonzini } while (sock == -1); 211a517e88bSPaolo Bonzini 212a517e88bSPaolo Bonzini ret = nbd_receive_negotiate(sock, NULL, &nbdflags, 213a517e88bSPaolo Bonzini &size, &blocksize); 214a517e88bSPaolo Bonzini if (ret == -1) { 215a517e88bSPaolo Bonzini goto out; 216a517e88bSPaolo Bonzini } 217a517e88bSPaolo Bonzini 218a517e88bSPaolo Bonzini ret = nbd_init(fd, sock, nbdflags, size, blocksize); 219a517e88bSPaolo Bonzini if (ret == -1) { 220a517e88bSPaolo Bonzini goto out; 221a517e88bSPaolo Bonzini } 222a517e88bSPaolo Bonzini 223a517e88bSPaolo Bonzini /* update partition table */ 224a517e88bSPaolo Bonzini pthread_create(&show_parts_thread, NULL, show_parts, NULL); 225a517e88bSPaolo Bonzini 226c1f8fdc3SPaolo Bonzini if (verbose) { 227a517e88bSPaolo Bonzini fprintf(stderr, "NBD device %s is now connected to %s\n", 228a517e88bSPaolo Bonzini device, srcpath); 229c1f8fdc3SPaolo Bonzini } else { 230c1f8fdc3SPaolo Bonzini /* Close stderr so that the qemu-nbd process exits. */ 231c1f8fdc3SPaolo Bonzini dup2(STDOUT_FILENO, STDERR_FILENO); 232c1f8fdc3SPaolo Bonzini } 233a517e88bSPaolo Bonzini 234a517e88bSPaolo Bonzini ret = nbd_client(fd); 235a517e88bSPaolo Bonzini if (ret) { 236a517e88bSPaolo Bonzini goto out; 237a517e88bSPaolo Bonzini } 238a517e88bSPaolo Bonzini close(fd); 239a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 240a517e88bSPaolo Bonzini return (void *) EXIT_SUCCESS; 241a517e88bSPaolo Bonzini 242a517e88bSPaolo Bonzini out: 243a517e88bSPaolo Bonzini kill(getpid(), SIGTERM); 244a517e88bSPaolo Bonzini return (void *) EXIT_FAILURE; 245cd831bd7Sths } 246cd831bd7Sths 2477a5ca864Sbellard int main(int argc, char **argv) 2487a5ca864Sbellard { 2497a5ca864Sbellard BlockDriverState *bs; 2507a5ca864Sbellard off_t dev_offset = 0; 2517a5ca864Sbellard off_t offset = 0; 252b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 253cd831bd7Sths bool disconnect = false; 2547a5ca864Sbellard const char *bindto = "0.0.0.0"; 255c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 2567a5ca864Sbellard struct sockaddr_in addr; 2577a5ca864Sbellard socklen_t addr_len = sizeof(addr); 2587a5ca864Sbellard off_t fd_size; 259d6aa671fSaliguori const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; 2607a5ca864Sbellard struct option lopt[] = { 261660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 262660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 263660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 264660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 265660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 266660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 267660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 268660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 269660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 270660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 271660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 272660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 273660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 274660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 275660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 276660f11beSBlue Swirl { NULL, 0, NULL, 0 } 2777a5ca864Sbellard }; 2787a5ca864Sbellard int ch; 2797a5ca864Sbellard int opt_ind = 0; 2807a5ca864Sbellard int li; 2817a5ca864Sbellard char *end; 282f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 2837a5ca864Sbellard int partition = -1; 284cd831bd7Sths int ret; 2853b05a8e9Sths int shared = 1; 2862f726488Sths uint8_t *data; 2873b05a8e9Sths fd_set fds; 2883b05a8e9Sths int *sharing_fds; 2893b05a8e9Sths int fd; 2903b05a8e9Sths int i; 2913b05a8e9Sths int nb_fds = 0; 2923b05a8e9Sths int max_fd; 29375818250Sths int persistent = 0; 294a517e88bSPaolo Bonzini pthread_t client_thread; 2957a5ca864Sbellard 296a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 297a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 298a517e88bSPaolo Bonzini */ 299bb345110SPaolo Bonzini struct sigaction sa_sigterm; 300bb345110SPaolo Bonzini int sigterm_fd[2]; 301bb345110SPaolo Bonzini if (qemu_pipe(sigterm_fd) == -1) { 302bb345110SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 303bb345110SPaolo Bonzini } 304bb345110SPaolo Bonzini 305bb345110SPaolo Bonzini sigterm_wfd = sigterm_fd[1]; 306bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 307bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 308bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 309bb345110SPaolo Bonzini 3107a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 3117a5ca864Sbellard switch (ch) { 3127a5ca864Sbellard case 's': 3132f726488Sths flags |= BDRV_O_SNAPSHOT; 3142f726488Sths break; 3152f726488Sths case 'n': 316a6599793SChristoph Hellwig flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; 3177a5ca864Sbellard break; 3187a5ca864Sbellard case 'b': 3197a5ca864Sbellard bindto = optarg; 3207a5ca864Sbellard break; 3217a5ca864Sbellard case 'p': 3227a5ca864Sbellard li = strtol(optarg, &end, 0); 3237a5ca864Sbellard if (*end) { 324b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 3257a5ca864Sbellard } 3267a5ca864Sbellard if (li < 1 || li > 65535) { 327b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 3287a5ca864Sbellard } 3297a5ca864Sbellard port = (uint16_t)li; 3307a5ca864Sbellard break; 3317a5ca864Sbellard case 'o': 3327a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 3337a5ca864Sbellard if (*end) { 334b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 3357a5ca864Sbellard } 3367a5ca864Sbellard if (dev_offset < 0) { 337b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 3387a5ca864Sbellard } 3397a5ca864Sbellard break; 3407a5ca864Sbellard case 'r': 341b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 34207108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 3437a5ca864Sbellard break; 3447a5ca864Sbellard case 'P': 3457a5ca864Sbellard partition = strtol(optarg, &end, 0); 3467a5ca864Sbellard if (*end) 347b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 3487a5ca864Sbellard if (partition < 1 || partition > 8) 349b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 3507a5ca864Sbellard break; 351cd831bd7Sths case 'k': 352b32f6c28SPaolo Bonzini sockpath = optarg; 353b32f6c28SPaolo Bonzini if (sockpath[0] != '/') 354b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 355cd831bd7Sths break; 356cd831bd7Sths case 'd': 357cd831bd7Sths disconnect = true; 358cd831bd7Sths break; 359cd831bd7Sths case 'c': 360cd831bd7Sths device = optarg; 361cd831bd7Sths break; 3623b05a8e9Sths case 'e': 3633b05a8e9Sths shared = strtol(optarg, &end, 0); 3643b05a8e9Sths if (*end) { 365b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 3663b05a8e9Sths } 3673b05a8e9Sths if (shared < 1) { 368b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 3693b05a8e9Sths } 3703b05a8e9Sths break; 37175818250Sths case 't': 37275818250Sths persistent = 1; 37375818250Sths break; 3747a5ca864Sbellard case 'v': 3757a5ca864Sbellard verbose = 1; 3767a5ca864Sbellard break; 3777a5ca864Sbellard case 'V': 3787a5ca864Sbellard version(argv[0]); 3797a5ca864Sbellard exit(0); 3807a5ca864Sbellard break; 3817a5ca864Sbellard case 'h': 3827a5ca864Sbellard usage(argv[0]); 3837a5ca864Sbellard exit(0); 3847a5ca864Sbellard break; 3857a5ca864Sbellard case '?': 386b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 3877a5ca864Sbellard argv[0]); 3887a5ca864Sbellard } 3897a5ca864Sbellard } 3907a5ca864Sbellard 3917a5ca864Sbellard if ((argc - optind) != 1) { 392b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 3937a5ca864Sbellard "Try `%s --help' for more information.", 3947a5ca864Sbellard argv[0]); 3957a5ca864Sbellard } 3967a5ca864Sbellard 397cd831bd7Sths if (disconnect) { 398cd831bd7Sths fd = open(argv[optind], O_RDWR); 399cd831bd7Sths if (fd == -1) 400cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 401cd831bd7Sths 402cd831bd7Sths nbd_disconnect(fd); 403cd831bd7Sths 404cd831bd7Sths close(fd); 405cd831bd7Sths 406cd831bd7Sths printf("%s disconnected\n", argv[optind]); 407cd831bd7Sths 408cd831bd7Sths return 0; 409cd831bd7Sths } 410cd831bd7Sths 411c1f8fdc3SPaolo Bonzini if (device && !verbose) { 412c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 413c1f8fdc3SPaolo Bonzini pid_t pid; 414c1f8fdc3SPaolo Bonzini int ret; 415c1f8fdc3SPaolo Bonzini 416c1f8fdc3SPaolo Bonzini if (qemu_pipe(stderr_fd) == -1) { 417c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 418c1f8fdc3SPaolo Bonzini } 419c1f8fdc3SPaolo Bonzini 420c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 421c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 422c1f8fdc3SPaolo Bonzini */ 423c1f8fdc3SPaolo Bonzini pid = fork(); 424c1f8fdc3SPaolo Bonzini if (pid == 0) { 425c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 426c1f8fdc3SPaolo Bonzini ret = qemu_daemon(0, 0); 427c1f8fdc3SPaolo Bonzini 428c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 429c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 430c1f8fdc3SPaolo Bonzini if (ret == -1) { 431c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 432c1f8fdc3SPaolo Bonzini } 433c1f8fdc3SPaolo Bonzini 434c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 435c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 436c1f8fdc3SPaolo Bonzini } else { 437c1f8fdc3SPaolo Bonzini bool errors = false; 438c1f8fdc3SPaolo Bonzini char *buf; 439c1f8fdc3SPaolo Bonzini 440c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 441c1f8fdc3SPaolo Bonzini * it closes the pipe. 442c1f8fdc3SPaolo Bonzini */ 443c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 444c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 445c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 446c1f8fdc3SPaolo Bonzini errors = true; 447c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 448c1f8fdc3SPaolo Bonzini if (ret == -1) { 449c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 450c1f8fdc3SPaolo Bonzini } 451c1f8fdc3SPaolo Bonzini } 452c1f8fdc3SPaolo Bonzini if (ret == -1) { 453c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 454c1f8fdc3SPaolo Bonzini } 455c1f8fdc3SPaolo Bonzini 456c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 457c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 458c1f8fdc3SPaolo Bonzini */ 459c1f8fdc3SPaolo Bonzini exit(errors); 460c1f8fdc3SPaolo Bonzini } 461c1f8fdc3SPaolo Bonzini } 462c1f8fdc3SPaolo Bonzini 4637a5ca864Sbellard bdrv_init(); 4647a5ca864Sbellard 4657a5ca864Sbellard bs = bdrv_new("hda"); 4667a5ca864Sbellard 467a517e88bSPaolo Bonzini srcpath = argv[optind]; 468a517e88bSPaolo Bonzini if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { 469cb7cf0e3SRyota Ozaki errno = -ret; 470a517e88bSPaolo Bonzini err(EXIT_FAILURE, "Failed to bdrv_open '%s'", srcpath); 471cb7cf0e3SRyota Ozaki } 4727a5ca864Sbellard 4737a5ca864Sbellard fd_size = bs->total_sectors * 512; 4747a5ca864Sbellard 4757a5ca864Sbellard if (partition != -1 && 4767a5ca864Sbellard find_partition(bs, partition, &dev_offset, &fd_size)) 477cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Could not find partition %d", partition); 4787a5ca864Sbellard 479cd831bd7Sths if (device) { 480a517e88bSPaolo Bonzini /* Open before spawning new threads. In the future, we may 481a517e88bSPaolo Bonzini * drop privileges after opening. 482a517e88bSPaolo Bonzini */ 483a517e88bSPaolo Bonzini fd = open(device, O_RDWR); 484a517e88bSPaolo Bonzini if (fd == -1) { 485a517e88bSPaolo Bonzini err(EXIT_FAILURE, "Failed to open %s", device); 486cb7cf0e3SRyota Ozaki } 487cb7cf0e3SRyota Ozaki 488b32f6c28SPaolo Bonzini if (sockpath == NULL) { 489b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 490b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 491cd831bd7Sths } 492cd831bd7Sths } 493cd831bd7Sths 4947267c094SAnthony Liguori sharing_fds = g_malloc((shared + 1) * sizeof(int)); 4953b05a8e9Sths 496b32f6c28SPaolo Bonzini if (sockpath) { 497b32f6c28SPaolo Bonzini sharing_fds[0] = unix_socket_incoming(sockpath); 498cd831bd7Sths } else { 4993b05a8e9Sths sharing_fds[0] = tcp_socket_incoming(bindto, port); 500cd831bd7Sths } 501cd831bd7Sths 5023b05a8e9Sths if (sharing_fds[0] == -1) 5037a5ca864Sbellard return 1; 504*f1ef5555SPaolo Bonzini 505*f1ef5555SPaolo Bonzini if (device) { 506*f1ef5555SPaolo Bonzini int ret; 507*f1ef5555SPaolo Bonzini 508*f1ef5555SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, &fd); 509*f1ef5555SPaolo Bonzini if (ret != 0) { 510*f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 511*f1ef5555SPaolo Bonzini strerror(ret)); 512*f1ef5555SPaolo Bonzini } 513*f1ef5555SPaolo Bonzini } else { 514*f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 515*f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 516*f1ef5555SPaolo Bonzini } 517*f1ef5555SPaolo Bonzini 5183b05a8e9Sths max_fd = sharing_fds[0]; 5193b05a8e9Sths nb_fds++; 5207a5ca864Sbellard 52172aef731SChristoph Hellwig data = qemu_blockalign(bs, NBD_BUFFER_SIZE); 522bb345110SPaolo Bonzini if (data == NULL) { 523b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Cannot allocate data buffer"); 524bb345110SPaolo Bonzini } 5253b05a8e9Sths 5263b05a8e9Sths do { 5273b05a8e9Sths FD_ZERO(&fds); 528bb345110SPaolo Bonzini FD_SET(sigterm_fd[0], &fds); 5293b05a8e9Sths for (i = 0; i < nb_fds; i++) 5303b05a8e9Sths FD_SET(sharing_fds[i], &fds); 5313b05a8e9Sths 532bb345110SPaolo Bonzini do { 5333b05a8e9Sths ret = select(max_fd + 1, &fds, NULL, NULL, NULL); 534bb345110SPaolo Bonzini } while (ret == -1 && errno == EINTR); 535bb345110SPaolo Bonzini if (ret == -1 || FD_ISSET(sigterm_fd[0], &fds)) { 5363b05a8e9Sths break; 537bb345110SPaolo Bonzini } 5383b05a8e9Sths 5393b05a8e9Sths if (FD_ISSET(sharing_fds[0], &fds)) 5403b05a8e9Sths ret--; 5413b05a8e9Sths for (i = 1; i < nb_fds && ret; i++) { 5423b05a8e9Sths if (FD_ISSET(sharing_fds[i], &fds)) { 5433b05a8e9Sths if (nbd_trip(bs, sharing_fds[i], fd_size, dev_offset, 544b90fb4b8SPaolo Bonzini &offset, nbdflags, data, NBD_BUFFER_SIZE) != 0) { 5453b05a8e9Sths close(sharing_fds[i]); 5463b05a8e9Sths nb_fds--; 5473b05a8e9Sths sharing_fds[i] = sharing_fds[nb_fds]; 5483b05a8e9Sths i--; 5493b05a8e9Sths } 5503b05a8e9Sths ret--; 5513b05a8e9Sths } 5523b05a8e9Sths } 5533b05a8e9Sths /* new connection ? */ 5543b05a8e9Sths if (FD_ISSET(sharing_fds[0], &fds)) { 5553b05a8e9Sths if (nb_fds < shared + 1) { 5563b05a8e9Sths sharing_fds[nb_fds] = accept(sharing_fds[0], 5573b05a8e9Sths (struct sockaddr *)&addr, 5583b05a8e9Sths &addr_len); 5593b05a8e9Sths if (sharing_fds[nb_fds] != -1 && 560b90fb4b8SPaolo Bonzini nbd_negotiate(sharing_fds[nb_fds], fd_size, nbdflags) != -1) { 5613b05a8e9Sths if (sharing_fds[nb_fds] > max_fd) 5623b05a8e9Sths max_fd = sharing_fds[nb_fds]; 5633b05a8e9Sths nb_fds++; 5643b05a8e9Sths } 5653b05a8e9Sths } 5663b05a8e9Sths } 56775818250Sths } while (persistent || nb_fds > 1); 568f8a83245SHerve Poussineau qemu_vfree(data); 5697a5ca864Sbellard 5703b05a8e9Sths close(sharing_fds[0]); 5717a5ca864Sbellard bdrv_close(bs); 5727267c094SAnthony Liguori g_free(sharing_fds); 573b32f6c28SPaolo Bonzini if (sockpath) { 574b32f6c28SPaolo Bonzini unlink(sockpath); 575b32f6c28SPaolo Bonzini } 5767a5ca864Sbellard 577a517e88bSPaolo Bonzini if (device) { 578a517e88bSPaolo Bonzini void *ret; 579a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 580a517e88bSPaolo Bonzini exit(ret != NULL); 581a517e88bSPaolo Bonzini } else { 582a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 583a517e88bSPaolo Bonzini } 5847a5ca864Sbellard } 585