| /* |
| * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
| * |
| * Network Block Device |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; under version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include <getopt.h> |
| #include <libgen.h> |
| #include <pthread.h> |
| |
| #include "qemu-common.h" |
| #include "qapi/error.h" |
| #include "qemu/cutils.h" |
| #include "sysemu/block-backend.h" |
| #include "block/block_int.h" |
| #include "block/nbd.h" |
| #include "qemu/main-loop.h" |
| #include "qemu/module.h" |
| #include "qemu/option.h" |
| #include "qemu/error-report.h" |
| #include "qemu/config-file.h" |
| #include "qemu/bswap.h" |
| #include "qemu/log.h" |
| #include "qemu/systemd.h" |
| #include "block/snapshot.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qstring.h" |
| #include "qom/object_interfaces.h" |
| #include "io/channel-socket.h" |
| #include "io/net-listener.h" |
| #include "crypto/init.h" |
| #include "trace/control.h" |
| #include "qemu-version.h" |
| |
| #ifdef __linux__ |
| #define HAVE_NBD_DEVICE 1 |
| #else |
| #define HAVE_NBD_DEVICE 0 |
| #endif |
| |
| #define SOCKET_PATH "/var/lock/qemu-nbd-%s" |
| #define QEMU_NBD_OPT_CACHE 256 |
| #define QEMU_NBD_OPT_AIO 257 |
| #define QEMU_NBD_OPT_DISCARD 258 |
| #define QEMU_NBD_OPT_DETECT_ZEROES 259 |
| #define QEMU_NBD_OPT_OBJECT 260 |
| #define QEMU_NBD_OPT_TLSCREDS 261 |
| #define QEMU_NBD_OPT_IMAGE_OPTS 262 |
| #define QEMU_NBD_OPT_FORK 263 |
| #define QEMU_NBD_OPT_TLSAUTHZ 264 |
| |
| #define MBR_SIZE 512 |
| |
| static NBDExport *export; |
| static int verbose; |
| static char *srcpath; |
| static SocketAddress *saddr; |
| static int persistent = 0; |
| static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state; |
| static int shared = 1; |
| static int nb_fds; |
| static QIONetListener *server; |
| static QCryptoTLSCreds *tlscreds; |
| static const char *tlsauthz; |
| |
| static void usage(const char *name) |
| { |
| (printf) ( |
| "Usage: %s [OPTIONS] FILE\n" |
| " or: %s -L [OPTIONS]\n" |
| "QEMU Disk Network Block Device Utility\n" |
| "\n" |
| " -h, --help display this help and exit\n" |
| " -V, --version output version information and exit\n" |
| "\n" |
| "Connection properties:\n" |
| " -p, --port=PORT port to listen on (default `%d')\n" |
| " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" |
| " -k, --socket=PATH path to the unix socket\n" |
| " (default '"SOCKET_PATH"')\n" |
| " -e, --shared=NUM device can be shared by NUM clients (default '1')\n" |
| " -t, --persistent don't exit on the last connection\n" |
| " -v, --verbose display extra debugging information\n" |
| " -x, --export-name=NAME expose export by name (default is empty string)\n" |
| " -D, --description=TEXT export a human-readable description\n" |
| "\n" |
| "Exposing part of the image:\n" |
| " -o, --offset=OFFSET offset into the image\n" |
| " -P, --partition=NUM only expose partition NUM\n" |
| " -B, --bitmap=NAME expose a persistent dirty bitmap\n" |
| "\n" |
| "General purpose options:\n" |
| " -L, --list list exports available from another NBD server\n" |
| " --object type,id=ID,... define an object such as 'secret' for providing\n" |
| " passwords and/or encryption keys\n" |
| " --tls-creds=ID use id of an earlier --object to provide TLS\n" |
| " --tls-authz=ID use id of an earlier --object to provide\n" |
| " authorization\n" |
| " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" |
| " specify tracing options\n" |
| " --fork fork off the server process and exit the parent\n" |
| " once the server is running\n" |
| #if HAVE_NBD_DEVICE |
| "\n" |
| "Kernel NBD client support:\n" |
| " -c, --connect=DEV connect FILE to the local NBD device DEV\n" |
| " -d, --disconnect disconnect the specified device\n" |
| #endif |
| "\n" |
| "Block device options:\n" |
| " -f, --format=FORMAT set image format (raw, qcow2, ...)\n" |
| " -r, --read-only export read-only\n" |
| " -s, --snapshot use FILE as an external snapshot, create a temporary\n" |
| " file with backing_file=FILE, redirect the write to\n" |
| " the temporary one\n" |
| " -l, --load-snapshot=SNAPSHOT_PARAM\n" |
| " load an internal snapshot inside FILE and export it\n" |
| " as an read-only device, SNAPSHOT_PARAM format is\n" |
| " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n" |
| " '[ID_OR_NAME]'\n" |
| " -n, --nocache disable host cache\n" |
| " --cache=MODE set cache mode (none, writeback, ...)\n" |
| " --aio=MODE set AIO mode (native or threads)\n" |
| " --discard=MODE set discard mode (ignore, unmap)\n" |
| " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n" |
| " --image-opts treat FILE as a full set of image options\n" |
| "\n" |
| QEMU_HELP_BOTTOM "\n" |
| , name, name, NBD_DEFAULT_PORT, "DEVICE"); |
| } |
| |
| static void version(const char *name) |
| { |
| printf( |
| "%s " QEMU_FULL_VERSION "\n" |
| "Written by Anthony Liguori.\n" |
| "\n" |
| QEMU_COPYRIGHT "\n" |
| "This is free software; see the source for copying conditions. There is NO\n" |
| "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n" |
| , name); |
| } |
| |
| struct partition_record |
| { |
| uint8_t bootable; |
| uint8_t start_head; |
| uint32_t start_cylinder; |
| uint8_t start_sector; |
| uint8_t system; |
| uint8_t end_head; |
| uint8_t end_cylinder; |
| uint8_t end_sector; |
| uint32_t start_sector_abs; |
| uint32_t nb_sectors_abs; |
| }; |
| |
| static void read_partition(uint8_t *p, struct partition_record *r) |
| { |
| r->bootable = p[0]; |
| r->start_head = p[1]; |
| r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300); |
| r->start_sector = p[2] & 0x3f; |
| r->system = p[4]; |
| r->end_head = p[5]; |
| r->end_cylinder = p[7] | ((p[6] << 2) & 0x300); |
| r->end_sector = p[6] & 0x3f; |
| |
| r->start_sector_abs = ldl_le_p(p + 8); |
| r->nb_sectors_abs = ldl_le_p(p + 12); |
| } |
| |
| static int find_partition(BlockBackend *blk, int partition, |
| uint64_t *offset, uint64_t *size) |
| { |
| struct partition_record mbr[4]; |
| uint8_t data[MBR_SIZE]; |
| int i; |
| int ext_partnum = 4; |
| int ret; |
| |
| ret = blk_pread(blk, 0, data, sizeof(data)); |
| if (ret < 0) { |
| error_report("error while reading: %s", strerror(-ret)); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (data[510] != 0x55 || data[511] != 0xaa) { |
| return -EINVAL; |
| } |
| |
| for (i = 0; i < 4; i++) { |
| read_partition(&data[446 + 16 * i], &mbr[i]); |
| |
| if (!mbr[i].system || !mbr[i].nb_sectors_abs) { |
| continue; |
| } |
| |
| if (mbr[i].system == 0xF || mbr[i].system == 0x5) { |
| struct partition_record ext[4]; |
| uint8_t data1[MBR_SIZE]; |
| int j; |
| |
| ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE, |
| data1, sizeof(data1)); |
| if (ret < 0) { |
| error_report("error while reading: %s", strerror(-ret)); |
| exit(EXIT_FAILURE); |
| } |
| |
| for (j = 0; j < 4; j++) { |
| read_partition(&data1[446 + 16 * j], &ext[j]); |
| if (!ext[j].system || !ext[j].nb_sectors_abs) { |
| continue; |
| } |
| |
| if ((ext_partnum + j + 1) == partition) { |
| *offset = (uint64_t)ext[j].start_sector_abs << 9; |
| *size = (uint64_t)ext[j].nb_sectors_abs << 9; |
| return 0; |
| } |
| } |
| ext_partnum += 4; |
| } else if ((i + 1) == partition) { |
| *offset = (uint64_t)mbr[i].start_sector_abs << 9; |
| *size = (uint64_t)mbr[i].nb_sectors_abs << 9; |
| return 0; |
| } |
| } |
| |
| return -ENOENT; |
| } |
| |
| static void termsig_handler(int signum) |
| { |
| atomic_cmpxchg(&state, RUNNING, TERMINATE); |
| qemu_notify_event(); |
| } |
| |
| |
| static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls, |
| const char *hostname) |
| { |
| int ret = EXIT_FAILURE; |
| int rc; |
| Error *err = NULL; |
| QIOChannelSocket *sioc; |
| NBDExportInfo *list; |
| int i, j; |
| |
| sioc = qio_channel_socket_new(); |
| if (qio_channel_socket_connect_sync(sioc, saddr, &err) < 0) { |
| error_report_err(err); |
| return EXIT_FAILURE; |
| } |
| rc = nbd_receive_export_list(QIO_CHANNEL(sioc), tls, hostname, &list, |
| &err); |
| if (rc < 0) { |
| if (err) { |
| error_report_err(err); |
| } |
| goto out; |
| } |
| printf("exports available: %d\n", rc); |
| for (i = 0; i < rc; i++) { |
| printf(" export: '%s'\n", list[i].name); |
| if (list[i].description && *list[i].description) { |
| printf(" description: %s\n", list[i].description); |
| } |
| if (list[i].flags & NBD_FLAG_HAS_FLAGS) { |
| static const char *const flag_names[] = { |
| [NBD_FLAG_READ_ONLY_BIT] = "readonly", |
| [NBD_FLAG_SEND_FLUSH_BIT] = "flush", |
| [NBD_FLAG_SEND_FUA_BIT] = "fua", |
| [NBD_FLAG_ROTATIONAL_BIT] = "rotational", |
| [NBD_FLAG_SEND_TRIM_BIT] = "trim", |
| [NBD_FLAG_SEND_WRITE_ZEROES_BIT] = "zeroes", |
| [NBD_FLAG_SEND_DF_BIT] = "df", |
| [NBD_FLAG_CAN_MULTI_CONN_BIT] = "multi", |
| [NBD_FLAG_SEND_RESIZE_BIT] = "resize", |
| [NBD_FLAG_SEND_CACHE_BIT] = "cache", |
| }; |
| |
| printf(" size: %" PRIu64 "\n", list[i].size); |
| printf(" flags: 0x%x (", list[i].flags); |
| for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) { |
| if (flag_names[bit] && (list[i].flags & (1 << bit))) { |
| printf(" %s", flag_names[bit]); |
| } |
| } |
| printf(" )\n"); |
| } |
| if (list[i].min_block) { |
| printf(" min block: %u\n", list[i].min_block); |
| printf(" opt block: %u\n", list[i].opt_block); |
| printf(" max block: %u\n", list[i].max_block); |
| } |
| if (list[i].n_contexts) { |
| printf(" available meta contexts: %d\n", list[i].n_contexts); |
| for (j = 0; j < list[i].n_contexts; j++) { |
| printf(" %s\n", list[i].contexts[j]); |
| } |
| } |
| } |
| nbd_free_export_list(list, rc); |
| |
| ret = EXIT_SUCCESS; |
| out: |
| object_unref(OBJECT(sioc)); |
| return ret; |
| } |
| |
| |
| #if HAVE_NBD_DEVICE |
| static void *show_parts(void *arg) |
| { |
| char *device = arg; |
| int nbd; |
| |
| /* linux just needs an open() to trigger |
| * the partition table update |
| * but remember to load the module with max_part != 0 : |
| * modprobe nbd max_part=63 |
| */ |
| nbd = open(device, O_RDWR); |
| if (nbd >= 0) { |
| close(nbd); |
| } |
| return NULL; |
| } |
| |
| static void *nbd_client_thread(void *arg) |
| { |
| char *device = arg; |
| NBDExportInfo info = { .request_sizes = false, .name = g_strdup("") }; |
| QIOChannelSocket *sioc; |
| int fd; |
| int ret; |
| pthread_t show_parts_thread; |
| Error *local_error = NULL; |
| |
| sioc = qio_channel_socket_new(); |
| if (qio_channel_socket_connect_sync(sioc, |
| saddr, |
| &local_error) < 0) { |
| error_report_err(local_error); |
| goto out; |
| } |
| |
| ret = nbd_receive_negotiate(QIO_CHANNEL(sioc), |
| NULL, NULL, NULL, &info, &local_error); |
| if (ret < 0) { |
| if (local_error) { |
| error_report_err(local_error); |
| } |
| goto out_socket; |
| } |
| |
| fd = open(device, O_RDWR); |
| if (fd < 0) { |
| /* Linux-only, we can use %m in printf. */ |
| error_report("Failed to open %s: %m", device); |
| goto out_socket; |
| } |
| |
| ret = nbd_init(fd, sioc, &info, &local_error); |
| if (ret < 0) { |
| error_report_err(local_error); |
| goto out_fd; |
| } |
| |
| /* update partition table */ |
| pthread_create(&show_parts_thread, NULL, show_parts, device); |
| |
| if (verbose) { |
| fprintf(stderr, "NBD device %s is now connected to %s\n", |
| device, srcpath); |
| } else { |
| /* Close stderr so that the qemu-nbd process exits. */ |
| dup2(STDOUT_FILENO, STDERR_FILENO); |
| } |
| |
| ret = nbd_client(fd); |
| if (ret) { |
| goto out_fd; |
| } |
| close(fd); |
| object_unref(OBJECT(sioc)); |
| g_free(info.name); |
| kill(getpid(), SIGTERM); |
| return (void *) EXIT_SUCCESS; |
| |
| out_fd: |
| close(fd); |
| out_socket: |
| object_unref(OBJECT(sioc)); |
| out: |
| g_free(info.name); |
| kill(getpid(), SIGTERM); |
| return (void *) EXIT_FAILURE; |
| } |
| #endif /* HAVE_NBD_DEVICE */ |
| |
| static int nbd_can_accept(void) |
| { |
| return state == RUNNING && nb_fds < shared; |
| } |
| |
| static void nbd_export_closed(NBDExport *export) |
| { |
| assert(state == TERMINATING); |
| state = TERMINATED; |
| } |
| |
| static void nbd_update_server_watch(void); |
| |
| static void nbd_client_closed(NBDClient *client, bool negotiated) |
| { |
| nb_fds--; |
| if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) { |
| state = TERMINATE; |
| } |
| nbd_update_server_watch(); |
| nbd_client_put(client); |
| } |
| |
| static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc, |
| gpointer opaque) |
| { |
| if (state >= TERMINATE) { |
| return; |
| } |
| |
| nb_fds++; |
| nbd_update_server_watch(); |
| nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed); |
| } |
| |
| static void nbd_update_server_watch(void) |
| { |
| if (nbd_can_accept()) { |
| qio_net_listener_set_client_func(server, nbd_accept, NULL, NULL); |
| } else { |
| qio_net_listener_set_client_func(server, NULL, NULL, NULL); |
| } |
| } |
| |
| |
| static SocketAddress *nbd_build_socket_address(const char *sockpath, |
| const char *bindto, |
| const char *port) |
| { |
| SocketAddress *saddr; |
| |
| saddr = g_new0(SocketAddress, 1); |
| if (sockpath) { |
| saddr->type = SOCKET_ADDRESS_TYPE_UNIX; |
| saddr->u.q_unix.path = g_strdup(sockpath); |
| } else { |
| InetSocketAddress *inet; |
| saddr->type = SOCKET_ADDRESS_TYPE_INET; |
| inet = &saddr->u.inet; |
| inet->host = g_strdup(bindto); |
| if (port) { |
| inet->port = g_strdup(port); |
| } else { |
| inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT); |
| } |
| } |
| |
| return saddr; |
| } |
| |
| |
| static QemuOptsList file_opts = { |
| .name = "file", |
| .implied_opt_name = "file", |
| .head = QTAILQ_HEAD_INITIALIZER(file_opts.head), |
| .desc = { |
| /* no elements => accept any params */ |
| { /* end of list */ } |
| }, |
| }; |
| |
| static QemuOptsList qemu_object_opts = { |
| .name = "object", |
| .implied_opt_name = "qom-type", |
| .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head), |
| .desc = { |
| { } |
| }, |
| }; |
| |
| |
| |
| static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list, |
| Error **errp) |
| { |
| Object *obj; |
| QCryptoTLSCreds *creds; |
| |
| obj = object_resolve_path_component( |
| object_get_objects_root(), id); |
| if (!obj) { |
| error_setg(errp, "No TLS credentials with id '%s'", |
| id); |
| return NULL; |
| } |
| creds = (QCryptoTLSCreds *) |
| object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); |
| if (!creds) { |
| error_setg(errp, "Object with id '%s' is not TLS credentials", |
| id); |
| return NULL; |
| } |
| |
| if (list) { |
| if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) { |
| error_setg(errp, |
| "Expecting TLS credentials with a client endpoint"); |
| return NULL; |
| } |
| } else { |
| if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { |
| error_setg(errp, |
| "Expecting TLS credentials with a server endpoint"); |
| return NULL; |
| } |
| } |
| object_ref(obj); |
| return creds; |
| } |
| |
| static void setup_address_and_port(const char **address, const char **port) |
| { |
| if (*address == NULL) { |
| *address = "0.0.0.0"; |
| } |
| |
| if (*port == NULL) { |
| *port = stringify(NBD_DEFAULT_PORT); |
| } |
| } |
| |
| /* |
| * Check socket parameters compatibility when socket activation is used. |
| */ |
| static const char *socket_activation_validate_opts(const char *device, |
| const char *sockpath, |
| const char *address, |
| const char *port, |
| bool list) |
| { |
| if (device != NULL) { |
| return "NBD device can't be set when using socket activation"; |
| } |
| |
| if (sockpath != NULL) { |
| return "Unix socket can't be set when using socket activation"; |
| } |
| |
| if (address != NULL) { |
| return "The interface can't be set when using socket activation"; |
| } |
| |
| if (port != NULL) { |
| return "TCP port number can't be set when using socket activation"; |
| } |
| |
| if (list) { |
| return "List mode is incompatible with socket activation"; |
| } |
| |
| return NULL; |
| } |
| |
| static void qemu_nbd_shutdown(void) |
| { |
| job_cancel_sync_all(); |
| bdrv_close_all(); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| BlockBackend *blk; |
| BlockDriverState *bs; |
| uint64_t dev_offset = 0; |
| uint16_t nbdflags = 0; |
| bool disconnect = false; |
| const char *bindto = NULL; |
| const char *port = NULL; |
| char *sockpath = NULL; |
| char *device = NULL; |
| int64_t fd_size; |
| QemuOpts *sn_opts = NULL; |
| const char *sn_id_or_name = NULL; |
| const char *sopt = "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L"; |
| struct option lopt[] = { |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, 'V' }, |
| { "bind", required_argument, NULL, 'b' }, |
| { "port", required_argument, NULL, 'p' }, |
| { "socket", required_argument, NULL, 'k' }, |
| { "offset", required_argument, NULL, 'o' }, |
| { "read-only", no_argument, NULL, 'r' }, |
| { "partition", required_argument, NULL, 'P' }, |
| { "bitmap", required_argument, NULL, 'B' }, |
| { "connect", required_argument, NULL, 'c' }, |
| { "disconnect", no_argument, NULL, 'd' }, |
| { "list", no_argument, NULL, 'L' }, |
| { "snapshot", no_argument, NULL, 's' }, |
| { "load-snapshot", required_argument, NULL, 'l' }, |
| { "nocache", no_argument, NULL, 'n' }, |
| { "cache", required_argument, NULL, QEMU_NBD_OPT_CACHE }, |
| { "aio", required_argument, NULL, QEMU_NBD_OPT_AIO }, |
| { "discard", required_argument, NULL, QEMU_NBD_OPT_DISCARD }, |
| { "detect-zeroes", required_argument, NULL, |
| QEMU_NBD_OPT_DETECT_ZEROES }, |
| { "shared", required_argument, NULL, 'e' }, |
| { "format", required_argument, NULL, 'f' }, |
| { "persistent", no_argument, NULL, 't' }, |
| { "verbose", no_argument, NULL, 'v' }, |
| { "object", required_argument, NULL, QEMU_NBD_OPT_OBJECT }, |
| { "export-name", required_argument, NULL, 'x' }, |
| { "description", required_argument, NULL, 'D' }, |
| { "tls-creds", required_argument, NULL, QEMU_NBD_OPT_TLSCREDS }, |
| { "tls-authz", required_argument, NULL, QEMU_NBD_OPT_TLSAUTHZ }, |
| { "image-opts", no_argument, NULL, QEMU_NBD_OPT_IMAGE_OPTS }, |
| { "trace", required_argument, NULL, 'T' }, |
| { "fork", no_argument, NULL, QEMU_NBD_OPT_FORK }, |
| { NULL, 0, NULL, 0 } |
| }; |
| int ch; |
| int opt_ind = 0; |
| int flags = BDRV_O_RDWR; |
| int partition = 0; |
| int ret = 0; |
| bool seen_cache = false; |
| bool seen_discard = false; |
| bool seen_aio = false; |
| pthread_t client_thread; |
| const char *fmt = NULL; |
| Error *local_err = NULL; |
| BlockdevDetectZeroesOptions detect_zeroes = BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF; |
| QDict *options = NULL; |
| const char *export_name = NULL; /* defaults to "" later for server mode */ |
| const char *export_description = NULL; |
| const char *bitmap = NULL; |
| const char *tlscredsid = NULL; |
| bool imageOpts = false; |
| bool writethrough = true; |
| char *trace_file = NULL; |
| bool fork_process = false; |
| bool list = false; |
| int old_stderr = -1; |
| unsigned socket_activation; |
| |
| /* The client thread uses SIGTERM to interrupt the server. A signal |
| * handler ensures that "qemu-nbd -v -c" exits with a nice status code. |
| */ |
| struct sigaction sa_sigterm; |
| memset(&sa_sigterm, 0, sizeof(sa_sigterm)); |
| sa_sigterm.sa_handler = termsig_handler; |
| sigaction(SIGTERM, &sa_sigterm, NULL); |
| |
| #ifdef CONFIG_POSIX |
| signal(SIGPIPE, SIG_IGN); |
| #endif |
| |
| error_init(argv[0]); |
| module_call_init(MODULE_INIT_TRACE); |
| qcrypto_init(&error_fatal); |
| |
| module_call_init(MODULE_INIT_QOM); |
| qemu_add_opts(&qemu_object_opts); |
| qemu_add_opts(&qemu_trace_opts); |
| qemu_init_exec_dir(argv[0]); |
| |
| while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) { |
| switch (ch) { |
| case 's': |
| flags |= BDRV_O_SNAPSHOT; |
| break; |
| case 'n': |
| optarg = (char *) "none"; |
| /* fallthrough */ |
| case QEMU_NBD_OPT_CACHE: |
| if (seen_cache) { |
| error_report("-n and --cache can only be specified once"); |
| exit(EXIT_FAILURE); |
| } |
| seen_cache = true; |
| if (bdrv_parse_cache_mode(optarg, &flags, &writethrough) == -1) { |
| error_report("Invalid cache mode `%s'", optarg); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case QEMU_NBD_OPT_AIO: |
| if (seen_aio) { |
| error_report("--aio can only be specified once"); |
| exit(EXIT_FAILURE); |
| } |
| seen_aio = true; |
| if (!strcmp(optarg, "native")) { |
| flags |= BDRV_O_NATIVE_AIO; |
| } else if (!strcmp(optarg, "threads")) { |
| /* this is the default */ |
| } else { |
| error_report("invalid aio mode `%s'", optarg); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case QEMU_NBD_OPT_DISCARD: |
| if (seen_discard) { |
| error_report("--discard can only be specified once"); |
| exit(EXIT_FAILURE); |
| } |
| seen_discard = true; |
| if (bdrv_parse_discard_flags(optarg, &flags) == -1) { |
| error_report("Invalid discard mode `%s'", optarg); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case QEMU_NBD_OPT_DETECT_ZEROES: |
| detect_zeroes = |
| qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, |
| optarg, |
| BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, |
| &local_err); |
| if (local_err) { |
| error_reportf_err(local_err, |
| "Failed to parse detect_zeroes mode: "); |
| exit(EXIT_FAILURE); |
| } |
| if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| !(flags & BDRV_O_UNMAP)) { |
| error_report("setting detect-zeroes to unmap is not allowed " |
| "without setting discard operation to unmap"); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'b': |
| bindto = optarg; |
| break; |
| case 'p': |
| port = optarg; |
| break; |
| case 'o': |
| if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) { |
| error_report("Invalid offset '%s'", optarg); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'l': |
| if (strstart(optarg, SNAPSHOT_OPT_BASE, NULL)) { |
| sn_opts = qemu_opts_parse_noisily(&internal_snapshot_opts, |
| optarg, false); |
| if (!sn_opts) { |
| error_report("Failed in parsing snapshot param `%s'", |
| optarg); |
| exit(EXIT_FAILURE); |
| } |
| } else { |
| sn_id_or_name = optarg; |
| } |
| /* fall through */ |
| case 'r': |
| nbdflags |= NBD_FLAG_READ_ONLY; |
| flags &= ~BDRV_O_RDWR; |
| break; |
| case 'P': |
| warn_report("The '-P' option is deprecated; use --image-opts with " |
| "a raw device wrapper for subset exports instead"); |
| if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 || |
| partition < 1 || partition > 8) { |
| error_report("Invalid partition '%s'", optarg); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'B': |
| bitmap = optarg; |
| break; |
| case 'k': |
| sockpath = optarg; |
| if (sockpath[0] != '/') { |
| error_report("socket path must be absolute"); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'd': |
| disconnect = true; |
| break; |
| case 'c': |
| device = optarg; |
| break; |
| case 'e': |
| if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 || |
| shared < 1) { |
| error_report("Invalid shared device number '%s'", optarg); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'f': |
| fmt = optarg; |
| break; |
| case 't': |
| persistent = 1; |
| break; |
| case 'x': |
| export_name = optarg; |
| break; |
| case 'D': |
| export_description = optarg; |
| break; |
| case 'v': |
| verbose = 1; |
| break; |
| case 'V': |
| version(argv[0]); |
| exit(0); |
| break; |
| case 'h': |
| usage(argv[0]); |
| exit(0); |
| break; |
| case '?': |
| error_report("Try `%s --help' for more information.", argv[0]); |
| exit(EXIT_FAILURE); |
| case QEMU_NBD_OPT_OBJECT: { |
| QemuOpts *opts; |
| opts = qemu_opts_parse_noisily(&qemu_object_opts, |
| optarg, true); |
| if (!opts) { |
| exit(EXIT_FAILURE); |
| } |
| } break; |
| case QEMU_NBD_OPT_TLSCREDS: |
| tlscredsid = optarg; |
| break; |
| case QEMU_NBD_OPT_IMAGE_OPTS: |
| imageOpts = true; |
| break; |
| case 'T': |
| g_free(trace_file); |
| trace_file = trace_opt_parse(optarg); |
| break; |
| case QEMU_NBD_OPT_TLSAUTHZ: |
| tlsauthz = optarg; |
| break; |
| case QEMU_NBD_OPT_FORK: |
| fork_process = true; |
| break; |
| case 'L': |
| list = true; |
| break; |
| } |
| } |
| |
| if (list) { |
| if (argc != optind) { |
| error_report("List mode is incompatible with a file name"); |
| exit(EXIT_FAILURE); |
| } |
| if (export_name || export_description || dev_offset || partition || |
| device || disconnect || fmt || sn_id_or_name || bitmap || |
| seen_aio || seen_discard || seen_cache) { |
| error_report("List mode is incompatible with per-device settings"); |
| exit(EXIT_FAILURE); |
| } |
| if (fork_process) { |
| error_report("List mode is incompatible with forking"); |
| exit(EXIT_FAILURE); |
| } |
| } else if ((argc - optind) != 1) { |
| error_report("Invalid number of arguments"); |
| error_printf("Try `%s --help' for more information.\n", argv[0]); |
| exit(EXIT_FAILURE); |
| } else if (!export_name) { |
| export_name = ""; |
| } |
| |
| qemu_opts_foreach(&qemu_object_opts, |
| user_creatable_add_opts_foreach, |
| NULL, &error_fatal); |
| |
| if (!trace_init_backends()) { |
| exit(1); |
| } |
| trace_init_file(trace_file); |
| qemu_set_log(LOG_TRACE); |
| |
| socket_activation = check_socket_activation(); |
| if (socket_activation == 0) { |
| setup_address_and_port(&bindto, &port); |
| } else { |
| /* Using socket activation - check user didn't use -p etc. */ |
| const char *err_msg = socket_activation_validate_opts(device, sockpath, |
| bindto, port, |
| list); |
| if (err_msg != NULL) { |
| error_report("%s", err_msg); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* qemu-nbd can only listen on a single socket. */ |
| if (socket_activation > 1) { |
| error_report("qemu-nbd does not support socket activation with %s > 1", |
| "LISTEN_FDS"); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (tlscredsid) { |
| if (sockpath) { |
| error_report("TLS is only supported with IPv4/IPv6"); |
| exit(EXIT_FAILURE); |
| } |
| if (device) { |
| error_report("TLS is not supported with a host device"); |
| exit(EXIT_FAILURE); |
| } |
| if (tlsauthz && list) { |
| error_report("TLS authorization is incompatible with export list"); |
| exit(EXIT_FAILURE); |
| } |
| tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err); |
| if (local_err) { |
| error_report("Failed to get TLS creds %s", |
| error_get_pretty(local_err)); |
| exit(EXIT_FAILURE); |
| } |
| } else { |
| if (tlsauthz) { |
| error_report("--tls-authz is not permitted without --tls-creds"); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (list) { |
| saddr = nbd_build_socket_address(sockpath, bindto, port); |
| return qemu_nbd_client_list(saddr, tlscreds, bindto); |
| } |
| |
| #if !HAVE_NBD_DEVICE |
| if (disconnect || device) { |
| error_report("Kernel /dev/nbdN support not available"); |
| exit(EXIT_FAILURE); |
| } |
| #else /* HAVE_NBD_DEVICE */ |
| if (disconnect) { |
| int nbdfd = open(argv[optind], O_RDWR); |
| if (nbdfd < 0) { |
| error_report("Cannot open %s: %s", argv[optind], |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| nbd_disconnect(nbdfd); |
| |
| close(nbdfd); |
| |
| printf("%s disconnected\n", argv[optind]); |
| |
| return 0; |
| } |
| #endif |
| |
| if ((device && !verbose) || fork_process) { |
| int stderr_fd[2]; |
| pid_t pid; |
| int ret; |
| |
| if (qemu_pipe(stderr_fd) < 0) { |
| error_report("Error setting up communication pipe: %s", |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Now daemonize, but keep a communication channel open to |
| * print errors and exit with the proper status code. |
| */ |
| pid = fork(); |
| if (pid < 0) { |
| error_report("Failed to fork: %s", strerror(errno)); |
| exit(EXIT_FAILURE); |
| } else if (pid == 0) { |
| close(stderr_fd[0]); |
| ret = qemu_daemon(1, 0); |
| |
| /* Temporarily redirect stderr to the parent's pipe... */ |
| old_stderr = dup(STDERR_FILENO); |
| dup2(stderr_fd[1], STDERR_FILENO); |
| if (ret < 0) { |
| error_report("Failed to daemonize: %s", strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* ... close the descriptor we inherited and go on. */ |
| close(stderr_fd[1]); |
| } else { |
| bool errors = false; |
| char *buf; |
| |
| /* In the parent. Print error messages from the child until |
| * it closes the pipe. |
| */ |
| close(stderr_fd[1]); |
| buf = g_malloc(1024); |
| while ((ret = read(stderr_fd[0], buf, 1024)) > 0) { |
| errors = true; |
| ret = qemu_write_full(STDERR_FILENO, buf, ret); |
| if (ret < 0) { |
| exit(EXIT_FAILURE); |
| } |
| } |
| if (ret < 0) { |
| error_report("Cannot read from daemon: %s", |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Usually the daemon should not print any message. |
| * Exit with zero status in that case. |
| */ |
| exit(errors); |
| } |
| } |
| |
| if (device != NULL && sockpath == NULL) { |
| sockpath = g_malloc(128); |
| snprintf(sockpath, 128, SOCKET_PATH, basename(device)); |
| } |
| |
| server = qio_net_listener_new(); |
| if (socket_activation == 0) { |
| saddr = nbd_build_socket_address(sockpath, bindto, port); |
| if (qio_net_listener_open_sync(server, saddr, &local_err) < 0) { |
| object_unref(OBJECT(server)); |
| error_report_err(local_err); |
| exit(EXIT_FAILURE); |
| } |
| } else { |
| size_t i; |
| /* See comment in check_socket_activation above. */ |
| for (i = 0; i < socket_activation; i++) { |
| QIOChannelSocket *sioc; |
| sioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD + i, |
| &local_err); |
| if (sioc == NULL) { |
| object_unref(OBJECT(server)); |
| error_report("Failed to use socket activation: %s", |
| error_get_pretty(local_err)); |
| exit(EXIT_FAILURE); |
| } |
| qio_net_listener_add(server, sioc); |
| object_unref(OBJECT(sioc)); |
| } |
| } |
| |
| if (qemu_init_main_loop(&local_err)) { |
| error_report_err(local_err); |
| exit(EXIT_FAILURE); |
| } |
| bdrv_init(); |
| atexit(qemu_nbd_shutdown); |
| |
| srcpath = argv[optind]; |
| if (imageOpts) { |
| QemuOpts *opts; |
| if (fmt) { |
| error_report("--image-opts and -f are mutually exclusive"); |
| exit(EXIT_FAILURE); |
| } |
| opts = qemu_opts_parse_noisily(&file_opts, srcpath, true); |
| if (!opts) { |
| qemu_opts_reset(&file_opts); |
| exit(EXIT_FAILURE); |
| } |
| options = qemu_opts_to_qdict(opts, NULL); |
| qemu_opts_reset(&file_opts); |
| blk = blk_new_open(NULL, NULL, options, flags, &local_err); |
| } else { |
| if (fmt) { |
| options = qdict_new(); |
| qdict_put_str(options, "driver", fmt); |
| } |
| blk = blk_new_open(srcpath, NULL, options, flags, &local_err); |
| } |
| |
| if (!blk) { |
| error_reportf_err(local_err, "Failed to blk_new_open '%s': ", |
| argv[optind]); |
| exit(EXIT_FAILURE); |
| } |
| bs = blk_bs(blk); |
| |
| blk_set_enable_write_cache(blk, !writethrough); |
| |
| if (sn_opts) { |
| ret = bdrv_snapshot_load_tmp(bs, |
| qemu_opt_get(sn_opts, SNAPSHOT_OPT_ID), |
| qemu_opt_get(sn_opts, SNAPSHOT_OPT_NAME), |
| &local_err); |
| } else if (sn_id_or_name) { |
| ret = bdrv_snapshot_load_tmp_by_id_or_name(bs, sn_id_or_name, |
| &local_err); |
| } |
| if (ret < 0) { |
| error_reportf_err(local_err, "Failed to load snapshot: "); |
| exit(EXIT_FAILURE); |
| } |
| |
| bs->detect_zeroes = detect_zeroes; |
| fd_size = blk_getlength(blk); |
| if (fd_size < 0) { |
| error_report("Failed to determine the image length: %s", |
| strerror(-fd_size)); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (dev_offset >= fd_size) { |
| error_report("Offset (%" PRIu64 ") has to be smaller than the image " |
| "size (%" PRId64 ")", dev_offset, fd_size); |
| exit(EXIT_FAILURE); |
| } |
| fd_size -= dev_offset; |
| |
| if (partition) { |
| uint64_t limit; |
| |
| if (dev_offset) { |
| error_report("Cannot request partition and offset together"); |
| exit(EXIT_FAILURE); |
| } |
| ret = find_partition(blk, partition, &dev_offset, &limit); |
| if (ret < 0) { |
| error_report("Could not find partition %d: %s", partition, |
| strerror(-ret)); |
| exit(EXIT_FAILURE); |
| } |
| /* |
| * MBR partition limits are (32-bit << 9); this assert lets |
| * the compiler know that we can't overflow 64 bits. |
| */ |
| assert(dev_offset + limit >= dev_offset); |
| if (dev_offset + limit > fd_size) { |
| error_report("Discovered partition %d at offset %" PRIu64 |
| " size %" PRIu64 ", but size exceeds file length %" |
| PRId64, partition, dev_offset, limit, fd_size); |
| exit(EXIT_FAILURE); |
| } |
| fd_size = limit; |
| } |
| |
| export = nbd_export_new(bs, dev_offset, fd_size, export_name, |
| export_description, bitmap, nbdflags, |
| nbd_export_closed, writethrough, NULL, |
| &error_fatal); |
| |
| if (device) { |
| #if HAVE_NBD_DEVICE |
| int ret; |
| |
| ret = pthread_create(&client_thread, NULL, nbd_client_thread, device); |
| if (ret != 0) { |
| error_report("Failed to create client thread: %s", strerror(ret)); |
| exit(EXIT_FAILURE); |
| } |
| #endif |
| } else { |
| /* Shut up GCC warnings. */ |
| memset(&client_thread, 0, sizeof(client_thread)); |
| } |
| |
| nbd_update_server_watch(); |
| |
| /* now when the initialization is (almost) complete, chdir("/") |
| * to free any busy filesystems */ |
| if (chdir("/") < 0) { |
| error_report("Could not chdir to root directory: %s", |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (fork_process) { |
| dup2(old_stderr, STDERR_FILENO); |
| close(old_stderr); |
| } |
| |
| state = RUNNING; |
| do { |
| main_loop_wait(false); |
| if (state == TERMINATE) { |
| state = TERMINATING; |
| nbd_export_close(export); |
| nbd_export_put(export); |
| export = NULL; |
| } |
| } while (state != TERMINATED); |
| |
| blk_unref(blk); |
| if (sockpath) { |
| unlink(sockpath); |
| } |
| |
| qemu_opts_del(sn_opts); |
| |
| if (device) { |
| void *ret; |
| pthread_join(client_thread, &ret); |
| exit(ret != NULL); |
| } else { |
| exit(EXIT_SUCCESS); |
| } |
| } |
