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- /*
- * 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 "qapi/error.h"
- #include "qemu-common.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/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/qstring.h"
- #include "qom/object_interfaces.h"
- #include "io/channel-socket.h"
- #include "crypto/init.h"
- #include "trace/control.h"
- #include "qemu-version.h"
- #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 MBR_SIZE 512
- static NBDExport *exp;
- static bool newproto;
- 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 QIOChannelSocket *server_ioc;
- static int server_watch = -1;
- static QCryptoTLSCreds *tlscreds;
- static void usage(const char *name)
- {
- (printf) (
- "Usage: %s [OPTIONS] FILE\n"
- "QEMU Disk Network Block Device Server\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\n"
- " -D, --description=TEXT with -x, also 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"
- "\n"
- "General purpose options:\n"
- " --object type,id=ID,... define an object such as 'secret' for providing\n"
- " passwords and/or encryption keys\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"
- #ifdef __linux__
- "Kernel NBD client support:\n"
- " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
- " -d, --disconnect disconnect the specified device\n"
- "\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, NBD_DEFAULT_PORT, "DEVICE");
- }
- static void version(const char *name)
- {
- printf(
- "%s " QEMU_VERSION QEMU_PKGVERSION "\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,
- off_t *offset, off_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 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, };
- 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, 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));
- kill(getpid(), SIGTERM);
- return (void *) EXIT_SUCCESS;
- out_fd:
- close(fd);
- out_socket:
- object_unref(OBJECT(sioc));
- out:
- kill(getpid(), SIGTERM);
- return (void *) EXIT_FAILURE;
- }
- static int nbd_can_accept(void)
- {
- return state == RUNNING && nb_fds < shared;
- }
- static void nbd_export_closed(NBDExport *exp)
- {
- 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 gboolean nbd_accept(QIOChannel *ioc, GIOCondition cond, gpointer opaque)
- {
- QIOChannelSocket *cioc;
- cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
- NULL);
- if (!cioc) {
- return TRUE;
- }
- if (state >= TERMINATE) {
- object_unref(OBJECT(cioc));
- return TRUE;
- }
- nb_fds++;
- nbd_update_server_watch();
- nbd_client_new(newproto ? NULL : exp, cioc,
- tlscreds, NULL, nbd_client_closed);
- object_unref(OBJECT(cioc));
- return TRUE;
- }
- static void nbd_update_server_watch(void)
- {
- if (nbd_can_accept()) {
- if (server_watch == -1) {
- server_watch = qio_channel_add_watch(QIO_CHANNEL(server_ioc),
- G_IO_IN,
- nbd_accept,
- NULL, NULL);
- }
- } else {
- if (server_watch != -1) {
- g_source_remove(server_watch);
- server_watch = -1;
- }
- }
- }
- 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, 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 (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)
- {
- 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";
- }
- return NULL;
- }
- int main(int argc, char **argv)
- {
- BlockBackend *blk;
- BlockDriverState *bs;
- off_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;
- off_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:";
- 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' },
- { "connect", required_argument, NULL, 'c' },
- { "disconnect", no_argument, NULL, 'd' },
- { "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 },
- { "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;
- char *end;
- int flags = BDRV_O_RDWR;
- int partition = -1;
- 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;
- const char *export_description = NULL;
- const char *tlscredsid = NULL;
- bool imageOpts = false;
- bool writethrough = true;
- char *trace_file = NULL;
- bool fork_process = 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
- 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':
- dev_offset = strtoll (optarg, &end, 0);
- if (*end) {
- error_report("Invalid offset `%s'", optarg);
- exit(EXIT_FAILURE);
- }
- if (dev_offset < 0) {
- error_report("Offset must be positive `%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':
- partition = strtol(optarg, &end, 0);
- if (*end) {
- error_report("Invalid partition `%s'", optarg);
- exit(EXIT_FAILURE);
- }
- if (partition < 1 || partition > 8) {
- error_report("Invalid partition %d", partition);
- exit(EXIT_FAILURE);
- }
- 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':
- shared = strtol(optarg, &end, 0);
- if (*end) {
- error_report("Invalid shared device number '%s'", optarg);
- exit(EXIT_FAILURE);
- }
- if (shared < 1) {
- error_report("Shared device number must be greater than 0");
- 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_FORK:
- fork_process = true;
- break;
- }
- }
- if ((argc - optind) != 1) {
- error_report("Invalid number of arguments");
- error_printf("Try `%s --help' for more information.\n", argv[0]);
- exit(EXIT_FAILURE);
- }
- if (qemu_opts_foreach(&qemu_object_opts,
- user_creatable_add_opts_foreach,
- NULL, NULL)) {
- exit(EXIT_FAILURE);
- }
- 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);
- 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 (!export_name) {
- /* Set the default NBD protocol export name, since
- * we *must* use new style protocol for TLS */
- export_name = "";
- }
- tlscreds = nbd_get_tls_creds(tlscredsid, &local_err);
- if (local_err) {
- error_report("Failed to get TLS creds %s",
- error_get_pretty(local_err));
- exit(EXIT_FAILURE);
- }
- }
- 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;
- }
- 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));
- }
- if (socket_activation == 0) {
- server_ioc = qio_channel_socket_new();
- saddr = nbd_build_socket_address(sockpath, bindto, port);
- if (qio_channel_socket_listen_sync(server_ioc, saddr, &local_err) < 0) {
- object_unref(OBJECT(server_ioc));
- error_report_err(local_err);
- return 1;
- }
- } else {
- /* See comment in check_socket_activation above. */
- assert(socket_activation == 1);
- server_ioc = qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD,
- &local_err);
- if (server_ioc == NULL) {
- error_report("Failed to use socket activation: %s",
- error_get_pretty(local_err));
- exit(EXIT_FAILURE);
- }
- }
- if (qemu_init_main_loop(&local_err)) {
- error_report_err(local_err);
- exit(EXIT_FAILURE);
- }
- bdrv_init();
- atexit(bdrv_close_all);
- 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 (%lld) has to be smaller than the image size "
- "(%lld)",
- (long long int)dev_offset, (long long int)fd_size);
- exit(EXIT_FAILURE);
- }
- fd_size -= dev_offset;
- if (partition != -1) {
- ret = find_partition(blk, partition, &dev_offset, &fd_size);
- if (ret < 0) {
- error_report("Could not find partition %d: %s", partition,
- strerror(-ret));
- exit(EXIT_FAILURE);
- }
- }
- exp = nbd_export_new(bs, dev_offset, fd_size, nbdflags, nbd_export_closed,
- writethrough, NULL, &local_err);
- if (!exp) {
- error_report_err(local_err);
- exit(EXIT_FAILURE);
- }
- if (export_name) {
- nbd_export_set_name(exp, export_name);
- nbd_export_set_description(exp, export_description);
- newproto = true;
- } else if (export_description) {
- error_report("Export description requires an export name");
- exit(EXIT_FAILURE);
- }
- if (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);
- }
- } 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(exp);
- nbd_export_put(exp);
- exp = 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);
- }
- }
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