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 38af49bbbeSPaolo Bonzini static NBDExport *exp; 39b1d8e52eSblueswir1 static int verbose; 40a517e88bSPaolo Bonzini static char *device; 41a517e88bSPaolo Bonzini static char *srcpath; 42a517e88bSPaolo Bonzini static char *sockpath; 43*a61c6782SPaolo Bonzini static bool sigterm_reported; 44*a61c6782SPaolo Bonzini static bool nbd_started; 45*a61c6782SPaolo Bonzini static int shared = 1; 46*a61c6782SPaolo Bonzini static int nb_fds; 477a5ca864Sbellard 487a5ca864Sbellard static void usage(const char *name) 497a5ca864Sbellard { 507a5ca864Sbellard printf( 517a5ca864Sbellard "Usage: %s [OPTIONS] FILE\n" 527a5ca864Sbellard "QEMU Disk Network Block Device Server\n" 537a5ca864Sbellard "\n" 54c2e2872bSLaurent Vivier " -p, --port=PORT port to listen on (default `%d')\n" 557a5ca864Sbellard " -o, --offset=OFFSET offset into the image\n" 567a5ca864Sbellard " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" 57cd831bd7Sths " -k, --socket=PATH path to the unix socket\n" 58cd831bd7Sths " (default '"SOCKET_PATH"')\n" 597a5ca864Sbellard " -r, --read-only export read-only\n" 607a5ca864Sbellard " -P, --partition=NUM only expose partition NUM\n" 612f726488Sths " -s, --snapshot use snapshot file\n" 622f726488Sths " -n, --nocache disable host cache\n" 63cd831bd7Sths " -c, --connect=DEV connect FILE to the local NBD device DEV\n" 64cd831bd7Sths " -d, --disconnect disconnect the specified device\n" 653b05a8e9Sths " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" 6675818250Sths " -t, --persistent don't exit on the last connection\n" 677a5ca864Sbellard " -v, --verbose display extra debugging information\n" 687a5ca864Sbellard " -h, --help display this help and exit\n" 697a5ca864Sbellard " -V, --version output version information and exit\n" 707a5ca864Sbellard "\n" 717a5ca864Sbellard "Report bugs to <anthony@codemonkey.ws>\n" 72c2e2872bSLaurent Vivier , name, NBD_DEFAULT_PORT, "DEVICE"); 737a5ca864Sbellard } 747a5ca864Sbellard 757a5ca864Sbellard static void version(const char *name) 767a5ca864Sbellard { 777a5ca864Sbellard printf( 78315bc7aaSths "%s version 0.0.1\n" 797a5ca864Sbellard "Written by Anthony Liguori.\n" 807a5ca864Sbellard "\n" 817a5ca864Sbellard "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n" 827a5ca864Sbellard "This is free software; see the source for copying conditions. There is NO\n" 837a5ca864Sbellard "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" 84315bc7aaSths , name); 857a5ca864Sbellard } 867a5ca864Sbellard 877a5ca864Sbellard struct partition_record 887a5ca864Sbellard { 897a5ca864Sbellard uint8_t bootable; 907a5ca864Sbellard uint8_t start_head; 917a5ca864Sbellard uint32_t start_cylinder; 927a5ca864Sbellard uint8_t start_sector; 937a5ca864Sbellard uint8_t system; 947a5ca864Sbellard uint8_t end_head; 957a5ca864Sbellard uint8_t end_cylinder; 967a5ca864Sbellard uint8_t end_sector; 977a5ca864Sbellard uint32_t start_sector_abs; 987a5ca864Sbellard uint32_t nb_sectors_abs; 997a5ca864Sbellard }; 1007a5ca864Sbellard 1017a5ca864Sbellard static void read_partition(uint8_t *p, struct partition_record *r) 1027a5ca864Sbellard { 1037a5ca864Sbellard r->bootable = p[0]; 1047a5ca864Sbellard r->start_head = p[1]; 1057a5ca864Sbellard r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); 1067a5ca864Sbellard r->start_sector = p[2] & 0x3f; 1077a5ca864Sbellard r->system = p[4]; 1087a5ca864Sbellard r->end_head = p[5]; 1097a5ca864Sbellard r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); 1107a5ca864Sbellard r->end_sector = p[6] & 0x3f; 1117a5ca864Sbellard r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24; 1127a5ca864Sbellard r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24; 1137a5ca864Sbellard } 1147a5ca864Sbellard 1157a5ca864Sbellard static int find_partition(BlockDriverState *bs, int partition, 1167a5ca864Sbellard off_t *offset, off_t *size) 1177a5ca864Sbellard { 1187a5ca864Sbellard struct partition_record mbr[4]; 1197a5ca864Sbellard uint8_t data[512]; 1207a5ca864Sbellard int i; 1217a5ca864Sbellard int ext_partnum = 4; 122cb7cf0e3SRyota Ozaki int ret; 1237a5ca864Sbellard 124cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, 0, data, 1)) < 0) { 125cb7cf0e3SRyota Ozaki errno = -ret; 126cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 127cb7cf0e3SRyota Ozaki } 1287a5ca864Sbellard 1297a5ca864Sbellard if (data[510] != 0x55 || data[511] != 0xaa) { 1307a5ca864Sbellard errno = -EINVAL; 1317a5ca864Sbellard return -1; 1327a5ca864Sbellard } 1337a5ca864Sbellard 1347a5ca864Sbellard for (i = 0; i < 4; i++) { 1357a5ca864Sbellard read_partition(&data[446 + 16 * i], &mbr[i]); 1367a5ca864Sbellard 1377a5ca864Sbellard if (!mbr[i].nb_sectors_abs) 1387a5ca864Sbellard continue; 1397a5ca864Sbellard 1407a5ca864Sbellard if (mbr[i].system == 0xF || mbr[i].system == 0x5) { 1417a5ca864Sbellard struct partition_record ext[4]; 1427a5ca864Sbellard uint8_t data1[512]; 1437a5ca864Sbellard int j; 1447a5ca864Sbellard 145cb7cf0e3SRyota Ozaki if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) { 146cb7cf0e3SRyota Ozaki errno = -ret; 147cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "error while reading"); 148cb7cf0e3SRyota Ozaki } 1497a5ca864Sbellard 1507a5ca864Sbellard for (j = 0; j < 4; j++) { 1517a5ca864Sbellard read_partition(&data1[446 + 16 * j], &ext[j]); 1527a5ca864Sbellard if (!ext[j].nb_sectors_abs) 1537a5ca864Sbellard continue; 1547a5ca864Sbellard 1557a5ca864Sbellard if ((ext_partnum + j + 1) == partition) { 1567a5ca864Sbellard *offset = (uint64_t)ext[j].start_sector_abs << 9; 1577a5ca864Sbellard *size = (uint64_t)ext[j].nb_sectors_abs << 9; 1587a5ca864Sbellard return 0; 1597a5ca864Sbellard } 1607a5ca864Sbellard } 1617a5ca864Sbellard ext_partnum += 4; 1627a5ca864Sbellard } else if ((i + 1) == partition) { 1637a5ca864Sbellard *offset = (uint64_t)mbr[i].start_sector_abs << 9; 1647a5ca864Sbellard *size = (uint64_t)mbr[i].nb_sectors_abs << 9; 1657a5ca864Sbellard return 0; 1667a5ca864Sbellard } 1677a5ca864Sbellard } 1687a5ca864Sbellard 1697a5ca864Sbellard errno = -ENOENT; 1707a5ca864Sbellard return -1; 1717a5ca864Sbellard } 1727a5ca864Sbellard 173bb345110SPaolo Bonzini static void termsig_handler(int signum) 174bb345110SPaolo Bonzini { 175*a61c6782SPaolo Bonzini sigterm_reported = true; 176*a61c6782SPaolo Bonzini qemu_notify_event(); 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 247*a61c6782SPaolo Bonzini static int nbd_can_accept(void *opaque) 248*a61c6782SPaolo Bonzini { 249*a61c6782SPaolo Bonzini return nb_fds < shared; 250*a61c6782SPaolo Bonzini } 251*a61c6782SPaolo Bonzini 252*a61c6782SPaolo Bonzini static void nbd_read(void *opaque) 253*a61c6782SPaolo Bonzini { 254*a61c6782SPaolo Bonzini int fd = (uintptr_t) opaque; 255*a61c6782SPaolo Bonzini 256*a61c6782SPaolo Bonzini if (nbd_trip(exp, fd) != 0) { 257*a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, NULL, NULL, NULL, NULL); 258*a61c6782SPaolo Bonzini close(fd); 259*a61c6782SPaolo Bonzini nb_fds--; 260*a61c6782SPaolo Bonzini } 261*a61c6782SPaolo Bonzini } 262*a61c6782SPaolo Bonzini 263*a61c6782SPaolo Bonzini static void nbd_accept(void *opaque) 264*a61c6782SPaolo Bonzini { 265*a61c6782SPaolo Bonzini int server_fd = (uintptr_t) opaque; 266*a61c6782SPaolo Bonzini struct sockaddr_in addr; 267*a61c6782SPaolo Bonzini socklen_t addr_len = sizeof(addr); 268*a61c6782SPaolo Bonzini 269*a61c6782SPaolo Bonzini int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len); 270*a61c6782SPaolo Bonzini nbd_started = true; 271*a61c6782SPaolo Bonzini if (fd != -1 && nbd_negotiate(exp, fd) != -1) { 272*a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, NULL, nbd_read, NULL, (void *) (intptr_t) fd); 273*a61c6782SPaolo Bonzini nb_fds++; 274*a61c6782SPaolo Bonzini } 275*a61c6782SPaolo Bonzini } 276*a61c6782SPaolo Bonzini 2777a5ca864Sbellard int main(int argc, char **argv) 2787a5ca864Sbellard { 2797a5ca864Sbellard BlockDriverState *bs; 2807a5ca864Sbellard off_t dev_offset = 0; 281b90fb4b8SPaolo Bonzini uint32_t nbdflags = 0; 282cd831bd7Sths bool disconnect = false; 2837a5ca864Sbellard const char *bindto = "0.0.0.0"; 284c2e2872bSLaurent Vivier int port = NBD_DEFAULT_PORT; 2857a5ca864Sbellard off_t fd_size; 286d6aa671fSaliguori const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t"; 2877a5ca864Sbellard struct option lopt[] = { 288660f11beSBlue Swirl { "help", 0, NULL, 'h' }, 289660f11beSBlue Swirl { "version", 0, NULL, 'V' }, 290660f11beSBlue Swirl { "bind", 1, NULL, 'b' }, 291660f11beSBlue Swirl { "port", 1, NULL, 'p' }, 292660f11beSBlue Swirl { "socket", 1, NULL, 'k' }, 293660f11beSBlue Swirl { "offset", 1, NULL, 'o' }, 294660f11beSBlue Swirl { "read-only", 0, NULL, 'r' }, 295660f11beSBlue Swirl { "partition", 1, NULL, 'P' }, 296660f11beSBlue Swirl { "connect", 1, NULL, 'c' }, 297660f11beSBlue Swirl { "disconnect", 0, NULL, 'd' }, 298660f11beSBlue Swirl { "snapshot", 0, NULL, 's' }, 299660f11beSBlue Swirl { "nocache", 0, NULL, 'n' }, 300660f11beSBlue Swirl { "shared", 1, NULL, 'e' }, 301660f11beSBlue Swirl { "persistent", 0, NULL, 't' }, 302660f11beSBlue Swirl { "verbose", 0, NULL, 'v' }, 303660f11beSBlue Swirl { NULL, 0, NULL, 0 } 3047a5ca864Sbellard }; 3057a5ca864Sbellard int ch; 3067a5ca864Sbellard int opt_ind = 0; 3077a5ca864Sbellard int li; 3087a5ca864Sbellard char *end; 309f5edb014SNaphtali Sprei int flags = BDRV_O_RDWR; 3107a5ca864Sbellard int partition = -1; 311cd831bd7Sths int ret; 3123b05a8e9Sths int fd; 31375818250Sths int persistent = 0; 314a517e88bSPaolo Bonzini pthread_t client_thread; 3157a5ca864Sbellard 316a517e88bSPaolo Bonzini /* The client thread uses SIGTERM to interrupt the server. A signal 317a517e88bSPaolo Bonzini * handler ensures that "qemu-nbd -v -c" exits with a nice status code. 318a517e88bSPaolo Bonzini */ 319bb345110SPaolo Bonzini struct sigaction sa_sigterm; 320bb345110SPaolo Bonzini memset(&sa_sigterm, 0, sizeof(sa_sigterm)); 321bb345110SPaolo Bonzini sa_sigterm.sa_handler = termsig_handler; 322bb345110SPaolo Bonzini sigaction(SIGTERM, &sa_sigterm, NULL); 323bb345110SPaolo Bonzini 3247a5ca864Sbellard while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { 3257a5ca864Sbellard switch (ch) { 3267a5ca864Sbellard case 's': 3272f726488Sths flags |= BDRV_O_SNAPSHOT; 3282f726488Sths break; 3292f726488Sths case 'n': 330a6599793SChristoph Hellwig flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; 3317a5ca864Sbellard break; 3327a5ca864Sbellard case 'b': 3337a5ca864Sbellard bindto = optarg; 3347a5ca864Sbellard break; 3357a5ca864Sbellard case 'p': 3367a5ca864Sbellard li = strtol(optarg, &end, 0); 3377a5ca864Sbellard if (*end) { 338b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid port `%s'", optarg); 3397a5ca864Sbellard } 3407a5ca864Sbellard if (li < 1 || li > 65535) { 341b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Port out of range `%s'", optarg); 3427a5ca864Sbellard } 3437a5ca864Sbellard port = (uint16_t)li; 3447a5ca864Sbellard break; 3457a5ca864Sbellard case 'o': 3467a5ca864Sbellard dev_offset = strtoll (optarg, &end, 0); 3477a5ca864Sbellard if (*end) { 348b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid offset `%s'", optarg); 3497a5ca864Sbellard } 3507a5ca864Sbellard if (dev_offset < 0) { 351b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg); 3527a5ca864Sbellard } 3537a5ca864Sbellard break; 3547a5ca864Sbellard case 'r': 355b90fb4b8SPaolo Bonzini nbdflags |= NBD_FLAG_READ_ONLY; 35607108b29SNaphtali Sprei flags &= ~BDRV_O_RDWR; 3577a5ca864Sbellard break; 3587a5ca864Sbellard case 'P': 3597a5ca864Sbellard partition = strtol(optarg, &end, 0); 3607a5ca864Sbellard if (*end) 361b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition `%s'", optarg); 3627a5ca864Sbellard if (partition < 1 || partition > 8) 363b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid partition %d", partition); 3647a5ca864Sbellard break; 365cd831bd7Sths case 'k': 366b32f6c28SPaolo Bonzini sockpath = optarg; 367b32f6c28SPaolo Bonzini if (sockpath[0] != '/') 368b6353beaSRyota Ozaki errx(EXIT_FAILURE, "socket path must be absolute\n"); 369cd831bd7Sths break; 370cd831bd7Sths case 'd': 371cd831bd7Sths disconnect = true; 372cd831bd7Sths break; 373cd831bd7Sths case 'c': 374cd831bd7Sths device = optarg; 375cd831bd7Sths break; 3763b05a8e9Sths case 'e': 3773b05a8e9Sths shared = strtol(optarg, &end, 0); 3783b05a8e9Sths if (*end) { 379b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg); 3803b05a8e9Sths } 3813b05a8e9Sths if (shared < 1) { 382b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Shared device number must be greater than 0\n"); 3833b05a8e9Sths } 3843b05a8e9Sths break; 38575818250Sths case 't': 38675818250Sths persistent = 1; 38775818250Sths break; 3887a5ca864Sbellard case 'v': 3897a5ca864Sbellard verbose = 1; 3907a5ca864Sbellard break; 3917a5ca864Sbellard case 'V': 3927a5ca864Sbellard version(argv[0]); 3937a5ca864Sbellard exit(0); 3947a5ca864Sbellard break; 3957a5ca864Sbellard case 'h': 3967a5ca864Sbellard usage(argv[0]); 3977a5ca864Sbellard exit(0); 3987a5ca864Sbellard break; 3997a5ca864Sbellard case '?': 400b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Try `%s --help' for more information.", 4017a5ca864Sbellard argv[0]); 4027a5ca864Sbellard } 4037a5ca864Sbellard } 4047a5ca864Sbellard 4057a5ca864Sbellard if ((argc - optind) != 1) { 406b6353beaSRyota Ozaki errx(EXIT_FAILURE, "Invalid number of argument.\n" 4077a5ca864Sbellard "Try `%s --help' for more information.", 4087a5ca864Sbellard argv[0]); 4097a5ca864Sbellard } 4107a5ca864Sbellard 411cd831bd7Sths if (disconnect) { 412cd831bd7Sths fd = open(argv[optind], O_RDWR); 413cd831bd7Sths if (fd == -1) 414cb7cf0e3SRyota Ozaki err(EXIT_FAILURE, "Cannot open %s", argv[optind]); 415cd831bd7Sths 416cd831bd7Sths nbd_disconnect(fd); 417cd831bd7Sths 418cd831bd7Sths close(fd); 419cd831bd7Sths 420cd831bd7Sths printf("%s disconnected\n", argv[optind]); 421cd831bd7Sths 422cd831bd7Sths return 0; 423cd831bd7Sths } 424cd831bd7Sths 425c1f8fdc3SPaolo Bonzini if (device && !verbose) { 426c1f8fdc3SPaolo Bonzini int stderr_fd[2]; 427c1f8fdc3SPaolo Bonzini pid_t pid; 428c1f8fdc3SPaolo Bonzini int ret; 429c1f8fdc3SPaolo Bonzini 430c1f8fdc3SPaolo Bonzini if (qemu_pipe(stderr_fd) == -1) { 431c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Error setting up communication pipe"); 432c1f8fdc3SPaolo Bonzini } 433c1f8fdc3SPaolo Bonzini 434c1f8fdc3SPaolo Bonzini /* Now daemonize, but keep a communication channel open to 435c1f8fdc3SPaolo Bonzini * print errors and exit with the proper status code. 436c1f8fdc3SPaolo Bonzini */ 437c1f8fdc3SPaolo Bonzini pid = fork(); 438c1f8fdc3SPaolo Bonzini if (pid == 0) { 439c1f8fdc3SPaolo Bonzini close(stderr_fd[0]); 440c1f8fdc3SPaolo Bonzini ret = qemu_daemon(0, 0); 441c1f8fdc3SPaolo Bonzini 442c1f8fdc3SPaolo Bonzini /* Temporarily redirect stderr to the parent's pipe... */ 443c1f8fdc3SPaolo Bonzini dup2(stderr_fd[1], STDERR_FILENO); 444c1f8fdc3SPaolo Bonzini if (ret == -1) { 445c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Failed to daemonize"); 446c1f8fdc3SPaolo Bonzini } 447c1f8fdc3SPaolo Bonzini 448c1f8fdc3SPaolo Bonzini /* ... close the descriptor we inherited and go on. */ 449c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 450c1f8fdc3SPaolo Bonzini } else { 451c1f8fdc3SPaolo Bonzini bool errors = false; 452c1f8fdc3SPaolo Bonzini char *buf; 453c1f8fdc3SPaolo Bonzini 454c1f8fdc3SPaolo Bonzini /* In the parent. Print error messages from the child until 455c1f8fdc3SPaolo Bonzini * it closes the pipe. 456c1f8fdc3SPaolo Bonzini */ 457c1f8fdc3SPaolo Bonzini close(stderr_fd[1]); 458c1f8fdc3SPaolo Bonzini buf = g_malloc(1024); 459c1f8fdc3SPaolo Bonzini while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { 460c1f8fdc3SPaolo Bonzini errors = true; 461c1f8fdc3SPaolo Bonzini ret = qemu_write_full(STDERR_FILENO, buf, ret); 462c1f8fdc3SPaolo Bonzini if (ret == -1) { 463c1f8fdc3SPaolo Bonzini exit(EXIT_FAILURE); 464c1f8fdc3SPaolo Bonzini } 465c1f8fdc3SPaolo Bonzini } 466c1f8fdc3SPaolo Bonzini if (ret == -1) { 467c1f8fdc3SPaolo Bonzini err(EXIT_FAILURE, "Cannot read from daemon"); 468c1f8fdc3SPaolo Bonzini } 469c1f8fdc3SPaolo Bonzini 470c1f8fdc3SPaolo Bonzini /* Usually the daemon should not print any message. 471c1f8fdc3SPaolo Bonzini * Exit with zero status in that case. 472c1f8fdc3SPaolo Bonzini */ 473c1f8fdc3SPaolo Bonzini exit(errors); 474c1f8fdc3SPaolo Bonzini } 475c1f8fdc3SPaolo Bonzini } 476c1f8fdc3SPaolo Bonzini 477cd831bd7Sths if (device) { 478a517e88bSPaolo Bonzini /* Open before spawning new threads. In the future, we may 479a517e88bSPaolo Bonzini * drop privileges after opening. 480a517e88bSPaolo Bonzini */ 481a517e88bSPaolo Bonzini fd = open(device, O_RDWR); 482a517e88bSPaolo Bonzini if (fd == -1) { 483a517e88bSPaolo Bonzini err(EXIT_FAILURE, "Failed to open %s", device); 484cb7cf0e3SRyota Ozaki } 485cb7cf0e3SRyota Ozaki 486b32f6c28SPaolo Bonzini if (sockpath == NULL) { 487b32f6c28SPaolo Bonzini sockpath = g_malloc(128); 488b32f6c28SPaolo Bonzini snprintf(sockpath, 128, SOCKET_PATH, basename(device)); 489cd831bd7Sths } 490cd831bd7Sths } 491cd831bd7Sths 492802ddc37SPaolo Bonzini bdrv_init(); 493802ddc37SPaolo Bonzini atexit(bdrv_close_all); 494802ddc37SPaolo Bonzini 495802ddc37SPaolo Bonzini bs = bdrv_new("hda"); 496802ddc37SPaolo Bonzini srcpath = argv[optind]; 497802ddc37SPaolo Bonzini if ((ret = bdrv_open(bs, srcpath, flags, NULL)) < 0) { 498802ddc37SPaolo Bonzini errno = -ret; 499802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]); 500802ddc37SPaolo Bonzini } 501802ddc37SPaolo Bonzini 502802ddc37SPaolo Bonzini fd_size = bs->total_sectors * 512; 503802ddc37SPaolo Bonzini 504802ddc37SPaolo Bonzini if (partition != -1 && 505802ddc37SPaolo Bonzini find_partition(bs, partition, &dev_offset, &fd_size)) { 506802ddc37SPaolo Bonzini err(EXIT_FAILURE, "Could not find partition %d", partition); 507802ddc37SPaolo Bonzini } 508802ddc37SPaolo Bonzini 509af49bbbeSPaolo Bonzini exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags); 5103b05a8e9Sths 511b32f6c28SPaolo Bonzini if (sockpath) { 512*a61c6782SPaolo Bonzini fd = unix_socket_incoming(sockpath); 513cd831bd7Sths } else { 514*a61c6782SPaolo Bonzini fd = tcp_socket_incoming(bindto, port); 515cd831bd7Sths } 516cd831bd7Sths 517*a61c6782SPaolo Bonzini if (fd == -1) { 5187a5ca864Sbellard return 1; 519*a61c6782SPaolo Bonzini } 520f1ef5555SPaolo Bonzini 521f1ef5555SPaolo Bonzini if (device) { 522f1ef5555SPaolo Bonzini int ret; 523f1ef5555SPaolo Bonzini 524f1ef5555SPaolo Bonzini ret = pthread_create(&client_thread, NULL, nbd_client_thread, &fd); 525f1ef5555SPaolo Bonzini if (ret != 0) { 526f1ef5555SPaolo Bonzini errx(EXIT_FAILURE, "Failed to create client thread: %s", 527f1ef5555SPaolo Bonzini strerror(ret)); 528f1ef5555SPaolo Bonzini } 529f1ef5555SPaolo Bonzini } else { 530f1ef5555SPaolo Bonzini /* Shut up GCC warnings. */ 531f1ef5555SPaolo Bonzini memset(&client_thread, 0, sizeof(client_thread)); 532f1ef5555SPaolo Bonzini } 533f1ef5555SPaolo Bonzini 534*a61c6782SPaolo Bonzini qemu_init_main_loop(); 535*a61c6782SPaolo Bonzini qemu_set_fd_handler2(fd, nbd_can_accept, nbd_accept, NULL, 536*a61c6782SPaolo Bonzini (void *)(uintptr_t)fd); 5377a5ca864Sbellard 5383b05a8e9Sths do { 539*a61c6782SPaolo Bonzini main_loop_wait(false); 540*a61c6782SPaolo Bonzini } while (!sigterm_reported && (persistent || !nbd_started || nb_fds > 0)); 5413b05a8e9Sths 542af49bbbeSPaolo Bonzini nbd_export_close(exp); 543b32f6c28SPaolo Bonzini if (sockpath) { 544b32f6c28SPaolo Bonzini unlink(sockpath); 545b32f6c28SPaolo Bonzini } 5467a5ca864Sbellard 547a517e88bSPaolo Bonzini if (device) { 548a517e88bSPaolo Bonzini void *ret; 549a517e88bSPaolo Bonzini pthread_join(client_thread, &ret); 550a517e88bSPaolo Bonzini exit(ret != NULL); 551a517e88bSPaolo Bonzini } else { 552a517e88bSPaolo Bonzini exit(EXIT_SUCCESS); 553a517e88bSPaolo Bonzini } 5547a5ca864Sbellard } 555