| /* |
| * 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/help-texts.h" |
| #include "qapi/error.h" |
| #include "qemu/cutils.h" |
| #include "sysemu/block-backend.h" |
| #include "sysemu/runstate.h" /* for qemu_system_killed() prototype */ |
| #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 "crypto/tlscreds.h" |
| #include "trace/control.h" |
| #include "qemu-version.h" |
| |
| #ifdef CONFIG_SELINUX |
| #include <selinux/selinux.h> |
| #endif |
| |
| #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 QEMU_NBD_OPT_PID_FILE 265 |
| #define QEMU_NBD_OPT_SELINUX_LABEL 266 |
| #define QEMU_NBD_OPT_TLSHOSTNAME 267 |
| |
| #define MBR_SIZE 512 |
| |
| static int persistent = 0; |
| static enum { RUNNING, TERMINATE, 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" |
| " -A, --allocation-depth expose the allocation depth\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" |
| " --pid-file=PATH store the server's process ID in the given file\n" |
| #ifdef CONFIG_SELINUX |
| " --selinux-label=LABEL set SELinux process label on listening socket\n" |
| #endif |
| #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 used to access the disk image, the\n" |
| " valid options are: 'none', 'writeback' (default),\n" |
| " 'writethrough', 'directsync' and 'unsafe'\n" |
| " --aio=MODE set AIO mode (native, io_uring 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); |
| } |
| |
| #ifdef CONFIG_POSIX |
| /* |
| * The client thread uses SIGTERM to interrupt the server. A signal |
| * handler ensures that "qemu-nbd -v -c" exits with a nice status code. |
| */ |
| void qemu_system_killed(int signum, pid_t pid) |
| { |
| qatomic_cmpxchg(&state, RUNNING, TERMINATE); |
| qemu_notify_event(); |
| } |
| #endif /* CONFIG_POSIX */ |
| |
| 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); |
| goto out; |
| } |
| 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", |
| [NBD_FLAG_SEND_FAST_ZERO_BIT] = "fast-zero", |
| [NBD_FLAG_BLOCK_STAT_PAYLOAD_BIT] = "block-status-payload", |
| }; |
| |
| 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); |
| } |
| printf(" transaction size: %s\n", |
| list[i].mode >= NBD_MODE_EXTENDED ? |
| "64-bit" : "32-bit"); |
| 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; |
| } |
| |
| |
| struct NbdClientOpts { |
| char *device; |
| char *srcpath; |
| SocketAddress *saddr; |
| int old_stderr; |
| bool fork_process; |
| bool verbose; |
| }; |
| |
| static void nbd_client_release_pipe(int old_stderr) |
| { |
| /* Close stderr so that the qemu-nbd process exits. */ |
| if (dup2(old_stderr, STDERR_FILENO) < 0) { |
| error_report("Could not release pipe to parent: %s", |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| if (old_stderr != STDOUT_FILENO && close(old_stderr) < 0) { |
| error_report("Could not release qemu-nbd: %s", strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| #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) |
| { |
| struct NbdClientOpts *opts = arg; |
| /* TODO: Revisit this if nbd.ko ever gains support for structured reply */ |
| NBDExportInfo info = { .request_sizes = false, .name = g_strdup(""), |
| .mode = NBD_MODE_SIMPLE }; |
| QIOChannelSocket *sioc; |
| int fd = -1; |
| int ret = EXIT_FAILURE; |
| pthread_t show_parts_thread; |
| Error *local_error = NULL; |
| |
| sioc = qio_channel_socket_new(); |
| if (qio_channel_socket_connect_sync(sioc, |
| opts->saddr, |
| &local_error) < 0) { |
| error_report_err(local_error); |
| goto out; |
| } |
| |
| if (nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, NULL, NULL, |
| &info, &local_error) < 0) { |
| if (local_error) { |
| error_report_err(local_error); |
| } |
| goto out; |
| } |
| |
| fd = open(opts->device, O_RDWR); |
| if (fd < 0) { |
| /* Linux-only, we can use %m in printf. */ |
| error_report("Failed to open %s: %m", opts->device); |
| goto out; |
| } |
| |
| if (nbd_init(fd, sioc, &info, &local_error) < 0) { |
| error_report_err(local_error); |
| goto out; |
| } |
| |
| /* update partition table */ |
| pthread_create(&show_parts_thread, NULL, show_parts, opts->device); |
| |
| if (opts->verbose && !opts->fork_process) { |
| fprintf(stderr, "NBD device %s is now connected to %s\n", |
| opts->device, opts->srcpath); |
| } else { |
| nbd_client_release_pipe(opts->old_stderr); |
| } |
| |
| if (nbd_client(fd) < 0) { |
| goto out; |
| } |
| |
| ret = EXIT_SUCCESS; |
| |
| out: |
| if (fd >= 0) { |
| close(fd); |
| } |
| object_unref(OBJECT(sioc)); |
| g_free(info.name); |
| kill(getpid(), SIGTERM); |
| return (void *) (intptr_t) ret; |
| } |
| #endif /* HAVE_NBD_DEVICE */ |
| |
| static int nbd_can_accept(void) |
| { |
| return state == RUNNING && (shared == 0 || nb_fds < shared); |
| } |
| |
| 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 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 (!qcrypto_tls_creds_check_endpoint(creds, |
| list |
| ? QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT |
| : QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, |
| errp)) { |
| 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, |
| const char *selinux, |
| 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 (selinux != NULL) { |
| return "SELinux label 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(); |
| blk_exp_close_all(); |
| bdrv_close_all(); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| BlockBackend *blk; |
| BlockDriverState *bs; |
| uint64_t dev_offset = 0; |
| bool readonly = false; |
| bool disconnect = false; |
| const char *bindto = NULL; |
| const char *port = NULL; |
| char *sockpath = NULL; |
| QemuOpts *sn_opts = NULL; |
| const char *sn_id_or_name = NULL; |
| const char *sopt = "hVb:o:p:rsnc:dvk:e:f:tl:x:T:D:AB: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' }, |
| { "allocation-depth", no_argument, NULL, 'A' }, |
| { "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-hostname", required_argument, NULL, QEMU_NBD_OPT_TLSHOSTNAME }, |
| { "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 }, |
| { "pid-file", required_argument, NULL, QEMU_NBD_OPT_PID_FILE }, |
| { "selinux-label", required_argument, NULL, |
| QEMU_NBD_OPT_SELINUX_LABEL }, |
| { NULL, 0, NULL, 0 } |
| }; |
| int ch; |
| int opt_ind = 0; |
| int flags = BDRV_O_RDWR; |
| 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; |
| BlockDirtyBitmapOrStrList *bitmaps = NULL; |
| bool alloc_depth = false; |
| const char *tlscredsid = NULL; |
| const char *tlshostname = NULL; |
| bool imageOpts = false; |
| bool writethrough = false; /* Client will flush as needed. */ |
| bool list = false; |
| unsigned socket_activation; |
| const char *pid_file_name = NULL; |
| const char *selinux_label = NULL; |
| BlockExportOptions *export_opts; |
| struct NbdClientOpts opts = { |
| .fork_process = false, |
| .verbose = false, |
| .device = NULL, |
| .srcpath = NULL, |
| .saddr = NULL, |
| .old_stderr = STDOUT_FILENO, |
| }; |
| |
| #ifdef CONFIG_POSIX |
| os_setup_early_signal_handling(); |
| os_setup_signal_handling(); |
| #endif |
| |
| socket_init(); |
| error_init(argv[0]); |
| module_call_init(MODULE_INIT_TRACE); |
| qcrypto_init(&error_fatal); |
| |
| module_call_init(MODULE_INIT_QOM); |
| 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 (bdrv_parse_aio(optarg, &flags) < 0) { |
| 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': |
| readonly = true; |
| flags &= ~BDRV_O_RDWR; |
| break; |
| case 'A': |
| alloc_depth = true; |
| break; |
| case 'B': |
| { |
| BlockDirtyBitmapOrStr *el = g_new(BlockDirtyBitmapOrStr, 1); |
| *el = (BlockDirtyBitmapOrStr) { |
| .type = QTYPE_QSTRING, |
| .u.local = g_strdup(optarg), |
| }; |
| QAPI_LIST_PREPEND(bitmaps, el); |
| } |
| 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': |
| opts.device = optarg; |
| break; |
| case 'e': |
| if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 || |
| shared < 0) { |
| 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; |
| if (strlen(export_name) > NBD_MAX_STRING_SIZE) { |
| error_report("export name '%s' too long", export_name); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'D': |
| export_description = optarg; |
| if (strlen(export_description) > NBD_MAX_STRING_SIZE) { |
| error_report("export description '%s' too long", |
| export_description); |
| exit(EXIT_FAILURE); |
| } |
| break; |
| case 'v': |
| opts.verbose = true; |
| 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: |
| user_creatable_process_cmdline(optarg); |
| break; |
| case QEMU_NBD_OPT_TLSCREDS: |
| tlscredsid = optarg; |
| break; |
| case QEMU_NBD_OPT_TLSHOSTNAME: |
| tlshostname = optarg; |
| break; |
| case QEMU_NBD_OPT_IMAGE_OPTS: |
| imageOpts = true; |
| break; |
| case 'T': |
| trace_opt_parse(optarg); |
| break; |
| case QEMU_NBD_OPT_TLSAUTHZ: |
| tlsauthz = optarg; |
| break; |
| case QEMU_NBD_OPT_FORK: |
| opts.fork_process = true; |
| break; |
| case 'L': |
| list = true; |
| break; |
| case QEMU_NBD_OPT_PID_FILE: |
| pid_file_name = optarg; |
| break; |
| case QEMU_NBD_OPT_SELINUX_LABEL: |
| selinux_label = optarg; |
| 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 || |
| opts.device || disconnect || fmt || sn_id_or_name || bitmaps || |
| alloc_depth || seen_aio || seen_discard || seen_cache) { |
| error_report("List mode is incompatible with per-device settings"); |
| exit(EXIT_FAILURE); |
| } |
| if (opts.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 = ""; |
| } |
| |
| if (!trace_init_backends()) { |
| exit(1); |
| } |
| trace_init_file(); |
| qemu_set_log(LOG_TRACE, &error_fatal); |
| |
| socket_activation = check_socket_activation(); |
| if (socket_activation == 0) { |
| if (!sockpath) { |
| 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(opts.device, |
| sockpath, |
| bindto, port, |
| selinux_label, |
| 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 (opts.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); |
| } |
| if (tlshostname && !list) { |
| error_report("TLS hostname is only supported with export list"); |
| exit(EXIT_FAILURE); |
| } |
| tlscreds = nbd_get_tls_creds(tlscredsid, list, &local_err); |
| if (local_err) { |
| error_reportf_err(local_err, "Failed to get TLS creds: "); |
| exit(EXIT_FAILURE); |
| } |
| } else { |
| if (tlsauthz) { |
| error_report("--tls-authz is not permitted without --tls-creds"); |
| exit(EXIT_FAILURE); |
| } |
| if (tlshostname) { |
| error_report("--tls-hostname is not permitted without --tls-creds"); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (selinux_label) { |
| #ifdef CONFIG_SELINUX |
| if (sockpath == NULL && opts.device == NULL) { |
| error_report("--selinux-label is not permitted without --socket"); |
| exit(EXIT_FAILURE); |
| } |
| #else |
| error_report("SELinux support not enabled in this binary"); |
| exit(EXIT_FAILURE); |
| #endif |
| } |
| |
| if (list) { |
| opts.saddr = nbd_build_socket_address(sockpath, bindto, port); |
| return qemu_nbd_client_list(opts.saddr, tlscreds, |
| tlshostname ? tlshostname : bindto); |
| } |
| |
| #if !HAVE_NBD_DEVICE |
| if (disconnect || opts.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 ((opts.device && !opts.verbose) || opts.fork_process) { |
| #ifndef WIN32 |
| g_autoptr(GError) err = NULL; |
| int stderr_fd[2]; |
| pid_t pid; |
| |
| if (!g_unix_open_pipe(stderr_fd, FD_CLOEXEC, &err)) { |
| error_report("Error setting up communication pipe: %s", |
| err->message); |
| 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) { |
| int saved_errno; |
| |
| close(stderr_fd[0]); |
| |
| /* Remember parent's stderr if we will be restoring it. */ |
| if (opts.verbose /* fork_process is set */) { |
| opts.old_stderr = dup(STDERR_FILENO); |
| if (opts.old_stderr < 0) { |
| error_report("Could not dup original stderr: %s", |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| ret = qemu_daemon(1, 0); |
| saved_errno = errno; /* dup2 will overwrite error below */ |
| |
| /* Temporarily redirect stderr to the parent's pipe... */ |
| if (dup2(stderr_fd[1], STDERR_FILENO) < 0) { |
| char str[256]; |
| snprintf(str, sizeof(str), |
| "%s: Failed to link stderr to the pipe: %s\n", |
| g_get_prgname(), strerror(errno)); |
| /* |
| * We are unable to use error_report() here as we need to get |
| * stderr pointed to the parent's pipe. Write to that pipe |
| * manually. |
| */ |
| ret = write(stderr_fd[1], str, strlen(str)); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (ret < 0) { |
| error_report("Failed to daemonize: %s", strerror(saved_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); |
| } |
| #else /* WIN32 */ |
| error_report("Unable to fork into background on Windows hosts"); |
| exit(EXIT_FAILURE); |
| #endif /* WIN32 */ |
| } |
| |
| if (opts.device != NULL && sockpath == NULL) { |
| sockpath = g_malloc(128); |
| snprintf(sockpath, 128, SOCKET_PATH, basename(opts.device)); |
| } |
| |
| server = qio_net_listener_new(); |
| if (socket_activation == 0) { |
| int backlog; |
| |
| if (persistent || shared == 0) { |
| backlog = SOMAXCONN; |
| } else { |
| backlog = MIN(shared, SOMAXCONN); |
| } |
| #ifdef CONFIG_SELINUX |
| if (selinux_label && setsockcreatecon_raw(selinux_label) == -1) { |
| error_report("Cannot set SELinux socket create context to %s: %s", |
| selinux_label, strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| #endif |
| opts.saddr = nbd_build_socket_address(sockpath, bindto, port); |
| if (qio_net_listener_open_sync(server, opts.saddr, backlog, |
| &local_err) < 0) { |
| object_unref(OBJECT(server)); |
| error_report_err(local_err); |
| exit(EXIT_FAILURE); |
| } |
| #ifdef CONFIG_SELINUX |
| if (selinux_label && setsockcreatecon_raw(NULL) == -1) { |
| error_report("Cannot clear SELinux socket create context: %s", |
| strerror(errno)); |
| exit(EXIT_FAILURE); |
| } |
| #endif |
| } 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_reportf_err(local_err, |
| "Failed to use socket activation: "); |
| exit(EXIT_FAILURE); |
| } |
| qio_net_listener_add(server, sioc); |
| object_unref(OBJECT(sioc)); |
| } |
| } |
| |
| qemu_init_main_loop(&error_fatal); |
| bdrv_init(); |
| atexit(qemu_nbd_shutdown); |
| |
| opts.srcpath = argv[optind]; |
| if (imageOpts) { |
| QemuOpts *o; |
| if (fmt) { |
| error_report("--image-opts and -f are mutually exclusive"); |
| exit(EXIT_FAILURE); |
| } |
| o = qemu_opts_parse_noisily(&file_opts, opts.srcpath, true); |
| if (!o) { |
| qemu_opts_reset(&file_opts); |
| exit(EXIT_FAILURE); |
| } |
| options = qemu_opts_to_qdict(o, 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(opts.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); |
| |
| if (dev_offset) { |
| QDict *raw_opts = qdict_new(); |
| qdict_put_str(raw_opts, "driver", "raw"); |
| qdict_put_str(raw_opts, "file", bs->node_name); |
| qdict_put_int(raw_opts, "offset", dev_offset); |
| |
| aio_context_acquire(qemu_get_aio_context()); |
| bs = bdrv_open(NULL, NULL, raw_opts, flags, &error_fatal); |
| aio_context_release(qemu_get_aio_context()); |
| |
| blk_remove_bs(blk); |
| blk_insert_bs(blk, bs, &error_fatal); |
| bdrv_unref(bs); |
| } |
| |
| 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; |
| |
| nbd_server_is_qemu_nbd(shared); |
| |
| export_opts = g_new(BlockExportOptions, 1); |
| *export_opts = (BlockExportOptions) { |
| .type = BLOCK_EXPORT_TYPE_NBD, |
| .id = g_strdup("qemu-nbd-export"), |
| .node_name = g_strdup(bdrv_get_node_name(bs)), |
| .has_writethrough = true, |
| .writethrough = writethrough, |
| .has_writable = true, |
| .writable = !readonly, |
| .u.nbd = { |
| .name = g_strdup(export_name), |
| .description = g_strdup(export_description), |
| .has_bitmaps = !!bitmaps, |
| .bitmaps = bitmaps, |
| .has_allocation_depth = alloc_depth, |
| .allocation_depth = alloc_depth, |
| }, |
| }; |
| blk_exp_add(export_opts, &error_fatal); |
| qapi_free_BlockExportOptions(export_opts); |
| |
| if (opts.device) { |
| #if HAVE_NBD_DEVICE |
| ret = pthread_create(&client_thread, NULL, nbd_client_thread, &opts); |
| 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(); |
| |
| if (pid_file_name) { |
| qemu_write_pidfile(pid_file_name, &error_fatal); |
| } |
| |
| /* 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 (opts.fork_process) { |
| nbd_client_release_pipe(opts.old_stderr); |
| } |
| |
| state = RUNNING; |
| do { |
| main_loop_wait(false); |
| if (state == TERMINATE) { |
| blk_exp_close_all(); |
| state = TERMINATED; |
| } |
| } while (state != TERMINATED); |
| |
| blk_unref(blk); |
| if (sockpath) { |
| unlink(sockpath); |
| } |
| |
| qemu_opts_del(sn_opts); |
| |
| if (opts.device) { |
| void *result; |
| pthread_join(client_thread, &result); |
| ret = (intptr_t)result; |
| exit(ret); |
| } else { |
| exit(EXIT_SUCCESS); |
| } |
| } |
