| /* |
| * QEMU Block driver for NBD |
| * |
| * Copyright (C) 2008 Bull S.A.S. |
| * Author: Laurent Vivier <Laurent.Vivier@bull.net> |
| * |
| * Some parts: |
| * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "block/nbd-client.h" |
| #include "qapi/error.h" |
| #include "qemu/uri.h" |
| #include "block/block_int.h" |
| #include "qemu/module.h" |
| #include "qapi-visit.h" |
| #include "qapi/qobject-input-visitor.h" |
| #include "qapi/qobject-output-visitor.h" |
| #include "qapi/qmp/qdict.h" |
| #include "qapi/qmp/qjson.h" |
| #include "qapi/qmp/qint.h" |
| #include "qapi/qmp/qstring.h" |
| #include "qemu/cutils.h" |
| |
| #define EN_OPTSTR ":exportname=" |
| |
| typedef struct BDRVNBDState { |
| NBDClientSession client; |
| |
| /* For nbd_refresh_filename() */ |
| SocketAddress *saddr; |
| char *export, *tlscredsid; |
| } BDRVNBDState; |
| |
| static int nbd_parse_uri(const char *filename, QDict *options) |
| { |
| URI *uri; |
| const char *p; |
| QueryParams *qp = NULL; |
| int ret = 0; |
| bool is_unix; |
| |
| uri = uri_parse(filename); |
| if (!uri) { |
| return -EINVAL; |
| } |
| |
| /* transport */ |
| if (!strcmp(uri->scheme, "nbd")) { |
| is_unix = false; |
| } else if (!strcmp(uri->scheme, "nbd+tcp")) { |
| is_unix = false; |
| } else if (!strcmp(uri->scheme, "nbd+unix")) { |
| is_unix = true; |
| } else { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| p = uri->path ? uri->path : "/"; |
| p += strspn(p, "/"); |
| if (p[0]) { |
| qdict_put(options, "export", qstring_from_str(p)); |
| } |
| |
| qp = query_params_parse(uri->query); |
| if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (is_unix) { |
| /* nbd+unix:///export?socket=path */ |
| if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) { |
| ret = -EINVAL; |
| goto out; |
| } |
| qdict_put(options, "server.type", qstring_from_str("unix")); |
| qdict_put(options, "server.data.path", |
| qstring_from_str(qp->p[0].value)); |
| } else { |
| QString *host; |
| char *port_str; |
| |
| /* nbd[+tcp]://host[:port]/export */ |
| if (!uri->server) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* strip braces from literal IPv6 address */ |
| if (uri->server[0] == '[') { |
| host = qstring_from_substr(uri->server, 1, |
| strlen(uri->server) - 2); |
| } else { |
| host = qstring_from_str(uri->server); |
| } |
| |
| qdict_put(options, "server.type", qstring_from_str("inet")); |
| qdict_put(options, "server.data.host", host); |
| |
| port_str = g_strdup_printf("%d", uri->port ?: NBD_DEFAULT_PORT); |
| qdict_put(options, "server.data.port", qstring_from_str(port_str)); |
| g_free(port_str); |
| } |
| |
| out: |
| if (qp) { |
| query_params_free(qp); |
| } |
| uri_free(uri); |
| return ret; |
| } |
| |
| static bool nbd_has_filename_options_conflict(QDict *options, Error **errp) |
| { |
| const QDictEntry *e; |
| |
| for (e = qdict_first(options); e; e = qdict_next(options, e)) { |
| if (!strcmp(e->key, "host") || |
| !strcmp(e->key, "port") || |
| !strcmp(e->key, "path") || |
| !strcmp(e->key, "export") || |
| strstart(e->key, "server.", NULL)) |
| { |
| error_setg(errp, "Option '%s' cannot be used with a file name", |
| e->key); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static void nbd_parse_filename(const char *filename, QDict *options, |
| Error **errp) |
| { |
| char *file; |
| char *export_name; |
| const char *host_spec; |
| const char *unixpath; |
| |
| if (nbd_has_filename_options_conflict(options, errp)) { |
| return; |
| } |
| |
| if (strstr(filename, "://")) { |
| int ret = nbd_parse_uri(filename, options); |
| if (ret < 0) { |
| error_setg(errp, "No valid URL specified"); |
| } |
| return; |
| } |
| |
| file = g_strdup(filename); |
| |
| export_name = strstr(file, EN_OPTSTR); |
| if (export_name) { |
| if (export_name[strlen(EN_OPTSTR)] == 0) { |
| goto out; |
| } |
| export_name[0] = 0; /* truncate 'file' */ |
| export_name += strlen(EN_OPTSTR); |
| |
| qdict_put(options, "export", qstring_from_str(export_name)); |
| } |
| |
| /* extract the host_spec - fail if it's not nbd:... */ |
| if (!strstart(file, "nbd:", &host_spec)) { |
| error_setg(errp, "File name string for NBD must start with 'nbd:'"); |
| goto out; |
| } |
| |
| if (!*host_spec) { |
| goto out; |
| } |
| |
| /* are we a UNIX or TCP socket? */ |
| if (strstart(host_spec, "unix:", &unixpath)) { |
| qdict_put(options, "server.type", qstring_from_str("unix")); |
| qdict_put(options, "server.data.path", qstring_from_str(unixpath)); |
| } else { |
| InetSocketAddress *addr = NULL; |
| |
| addr = inet_parse(host_spec, errp); |
| if (!addr) { |
| goto out; |
| } |
| |
| qdict_put(options, "server.type", qstring_from_str("inet")); |
| qdict_put(options, "server.data.host", qstring_from_str(addr->host)); |
| qdict_put(options, "server.data.port", qstring_from_str(addr->port)); |
| qapi_free_InetSocketAddress(addr); |
| } |
| |
| out: |
| g_free(file); |
| } |
| |
| static bool nbd_process_legacy_socket_options(QDict *output_options, |
| QemuOpts *legacy_opts, |
| Error **errp) |
| { |
| const char *path = qemu_opt_get(legacy_opts, "path"); |
| const char *host = qemu_opt_get(legacy_opts, "host"); |
| const char *port = qemu_opt_get(legacy_opts, "port"); |
| const QDictEntry *e; |
| |
| if (!path && !host && !port) { |
| return true; |
| } |
| |
| for (e = qdict_first(output_options); e; e = qdict_next(output_options, e)) |
| { |
| if (strstart(e->key, "server.", NULL)) { |
| error_setg(errp, "Cannot use 'server' and path/host/port at the " |
| "same time"); |
| return false; |
| } |
| } |
| |
| if (path && host) { |
| error_setg(errp, "path and host may not be used at the same time"); |
| return false; |
| } else if (path) { |
| if (port) { |
| error_setg(errp, "port may not be used without host"); |
| return false; |
| } |
| |
| qdict_put(output_options, "server.type", qstring_from_str("unix")); |
| qdict_put(output_options, "server.data.path", qstring_from_str(path)); |
| } else if (host) { |
| qdict_put(output_options, "server.type", qstring_from_str("inet")); |
| qdict_put(output_options, "server.data.host", qstring_from_str(host)); |
| qdict_put(output_options, "server.data.port", |
| qstring_from_str(port ?: stringify(NBD_DEFAULT_PORT))); |
| } |
| |
| return true; |
| } |
| |
| static SocketAddress *nbd_config(BDRVNBDState *s, QDict *options, Error **errp) |
| { |
| SocketAddress *saddr = NULL; |
| QDict *addr = NULL; |
| QObject *crumpled_addr = NULL; |
| Visitor *iv = NULL; |
| Error *local_err = NULL; |
| |
| qdict_extract_subqdict(options, &addr, "server."); |
| if (!qdict_size(addr)) { |
| error_setg(errp, "NBD server address missing"); |
| goto done; |
| } |
| |
| crumpled_addr = qdict_crumple(addr, errp); |
| if (!crumpled_addr) { |
| goto done; |
| } |
| |
| iv = qobject_input_visitor_new(crumpled_addr); |
| visit_type_SocketAddress(iv, NULL, &saddr, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto done; |
| } |
| |
| s->client.is_unix = saddr->type == SOCKET_ADDRESS_KIND_UNIX; |
| |
| done: |
| QDECREF(addr); |
| qobject_decref(crumpled_addr); |
| visit_free(iv); |
| return saddr; |
| } |
| |
| NBDClientSession *nbd_get_client_session(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| return &s->client; |
| } |
| |
| static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr, |
| Error **errp) |
| { |
| QIOChannelSocket *sioc; |
| Error *local_err = NULL; |
| |
| sioc = qio_channel_socket_new(); |
| qio_channel_set_name(QIO_CHANNEL(sioc), "nbd-client"); |
| |
| qio_channel_socket_connect_sync(sioc, |
| saddr, |
| &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| return NULL; |
| } |
| |
| qio_channel_set_delay(QIO_CHANNEL(sioc), false); |
| |
| return sioc; |
| } |
| |
| |
| 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_CLIENT) { |
| error_setg(errp, |
| "Expecting TLS credentials with a client endpoint"); |
| return NULL; |
| } |
| object_ref(obj); |
| return creds; |
| } |
| |
| |
| static QemuOptsList nbd_runtime_opts = { |
| .name = "nbd", |
| .head = QTAILQ_HEAD_INITIALIZER(nbd_runtime_opts.head), |
| .desc = { |
| { |
| .name = "host", |
| .type = QEMU_OPT_STRING, |
| .help = "TCP host to connect to", |
| }, |
| { |
| .name = "port", |
| .type = QEMU_OPT_STRING, |
| .help = "TCP port to connect to", |
| }, |
| { |
| .name = "path", |
| .type = QEMU_OPT_STRING, |
| .help = "Unix socket path to connect to", |
| }, |
| { |
| .name = "export", |
| .type = QEMU_OPT_STRING, |
| .help = "Name of the NBD export to open", |
| }, |
| { |
| .name = "tls-creds", |
| .type = QEMU_OPT_STRING, |
| .help = "ID of the TLS credentials to use", |
| }, |
| }, |
| }; |
| |
| static int nbd_open(BlockDriverState *bs, QDict *options, int flags, |
| Error **errp) |
| { |
| BDRVNBDState *s = bs->opaque; |
| QemuOpts *opts = NULL; |
| Error *local_err = NULL; |
| QIOChannelSocket *sioc = NULL; |
| QCryptoTLSCreds *tlscreds = NULL; |
| const char *hostname = NULL; |
| int ret = -EINVAL; |
| |
| opts = qemu_opts_create(&nbd_runtime_opts, NULL, 0, &error_abort); |
| qemu_opts_absorb_qdict(opts, options, &local_err); |
| if (local_err) { |
| error_propagate(errp, local_err); |
| goto error; |
| } |
| |
| /* Translate @host, @port, and @path to a SocketAddress */ |
| if (!nbd_process_legacy_socket_options(options, opts, errp)) { |
| goto error; |
| } |
| |
| /* Pop the config into our state object. Exit if invalid. */ |
| s->saddr = nbd_config(s, options, errp); |
| if (!s->saddr) { |
| goto error; |
| } |
| |
| s->export = g_strdup(qemu_opt_get(opts, "export")); |
| |
| s->tlscredsid = g_strdup(qemu_opt_get(opts, "tls-creds")); |
| if (s->tlscredsid) { |
| tlscreds = nbd_get_tls_creds(s->tlscredsid, errp); |
| if (!tlscreds) { |
| goto error; |
| } |
| |
| if (s->saddr->type != SOCKET_ADDRESS_KIND_INET) { |
| error_setg(errp, "TLS only supported over IP sockets"); |
| goto error; |
| } |
| hostname = s->saddr->u.inet.data->host; |
| } |
| |
| /* establish TCP connection, return error if it fails |
| * TODO: Configurable retry-until-timeout behaviour. |
| */ |
| sioc = nbd_establish_connection(s->saddr, errp); |
| if (!sioc) { |
| ret = -ECONNREFUSED; |
| goto error; |
| } |
| |
| /* NBD handshake */ |
| ret = nbd_client_init(bs, sioc, s->export, |
| tlscreds, hostname, errp); |
| error: |
| if (sioc) { |
| object_unref(OBJECT(sioc)); |
| } |
| if (tlscreds) { |
| object_unref(OBJECT(tlscreds)); |
| } |
| if (ret < 0) { |
| qapi_free_SocketAddress(s->saddr); |
| g_free(s->export); |
| g_free(s->tlscredsid); |
| } |
| qemu_opts_del(opts); |
| return ret; |
| } |
| |
| static int nbd_co_flush(BlockDriverState *bs) |
| { |
| return nbd_client_co_flush(bs); |
| } |
| |
| static void nbd_refresh_limits(BlockDriverState *bs, Error **errp) |
| { |
| bs->bl.max_pdiscard = NBD_MAX_BUFFER_SIZE; |
| bs->bl.max_pwrite_zeroes = NBD_MAX_BUFFER_SIZE; |
| bs->bl.max_transfer = NBD_MAX_BUFFER_SIZE; |
| } |
| |
| static void nbd_close(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| nbd_client_close(bs); |
| |
| qapi_free_SocketAddress(s->saddr); |
| g_free(s->export); |
| g_free(s->tlscredsid); |
| } |
| |
| static int64_t nbd_getlength(BlockDriverState *bs) |
| { |
| BDRVNBDState *s = bs->opaque; |
| |
| return s->client.size; |
| } |
| |
| static void nbd_detach_aio_context(BlockDriverState *bs) |
| { |
| nbd_client_detach_aio_context(bs); |
| } |
| |
| static void nbd_attach_aio_context(BlockDriverState *bs, |
| AioContext *new_context) |
| { |
| nbd_client_attach_aio_context(bs, new_context); |
| } |
| |
| static void nbd_refresh_filename(BlockDriverState *bs, QDict *options) |
| { |
| BDRVNBDState *s = bs->opaque; |
| QDict *opts = qdict_new(); |
| QObject *saddr_qdict; |
| Visitor *ov; |
| const char *host = NULL, *port = NULL, *path = NULL; |
| |
| if (s->saddr->type == SOCKET_ADDRESS_KIND_INET) { |
| const InetSocketAddress *inet = s->saddr->u.inet.data; |
| if (!inet->has_ipv4 && !inet->has_ipv6 && !inet->has_to) { |
| host = inet->host; |
| port = inet->port; |
| } |
| } else if (s->saddr->type == SOCKET_ADDRESS_KIND_UNIX) { |
| path = s->saddr->u.q_unix.data->path; |
| } |
| |
| qdict_put(opts, "driver", qstring_from_str("nbd")); |
| |
| if (path && s->export) { |
| snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd+unix:///%s?socket=%s", s->export, path); |
| } else if (path && !s->export) { |
| snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd+unix://?socket=%s", path); |
| } else if (host && s->export) { |
| snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd://%s:%s/%s", host, port, s->export); |
| } else if (host && !s->export) { |
| snprintf(bs->exact_filename, sizeof(bs->exact_filename), |
| "nbd://%s:%s", host, port); |
| } |
| |
| ov = qobject_output_visitor_new(&saddr_qdict); |
| visit_type_SocketAddress(ov, NULL, &s->saddr, &error_abort); |
| visit_complete(ov, &saddr_qdict); |
| visit_free(ov); |
| qdict_put_obj(opts, "server", saddr_qdict); |
| |
| if (s->export) { |
| qdict_put(opts, "export", qstring_from_str(s->export)); |
| } |
| if (s->tlscredsid) { |
| qdict_put(opts, "tls-creds", qstring_from_str(s->tlscredsid)); |
| } |
| |
| qdict_flatten(opts); |
| bs->full_open_options = opts; |
| } |
| |
| static BlockDriver bdrv_nbd = { |
| .format_name = "nbd", |
| .protocol_name = "nbd", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_parse_filename = nbd_parse_filename, |
| .bdrv_file_open = nbd_open, |
| .bdrv_co_preadv = nbd_client_co_preadv, |
| .bdrv_co_pwritev = nbd_client_co_pwritev, |
| .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| .bdrv_close = nbd_close, |
| .bdrv_co_flush_to_os = nbd_co_flush, |
| .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| .bdrv_refresh_limits = nbd_refresh_limits, |
| .bdrv_getlength = nbd_getlength, |
| .bdrv_detach_aio_context = nbd_detach_aio_context, |
| .bdrv_attach_aio_context = nbd_attach_aio_context, |
| .bdrv_refresh_filename = nbd_refresh_filename, |
| }; |
| |
| static BlockDriver bdrv_nbd_tcp = { |
| .format_name = "nbd", |
| .protocol_name = "nbd+tcp", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_parse_filename = nbd_parse_filename, |
| .bdrv_file_open = nbd_open, |
| .bdrv_co_preadv = nbd_client_co_preadv, |
| .bdrv_co_pwritev = nbd_client_co_pwritev, |
| .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| .bdrv_close = nbd_close, |
| .bdrv_co_flush_to_os = nbd_co_flush, |
| .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| .bdrv_refresh_limits = nbd_refresh_limits, |
| .bdrv_getlength = nbd_getlength, |
| .bdrv_detach_aio_context = nbd_detach_aio_context, |
| .bdrv_attach_aio_context = nbd_attach_aio_context, |
| .bdrv_refresh_filename = nbd_refresh_filename, |
| }; |
| |
| static BlockDriver bdrv_nbd_unix = { |
| .format_name = "nbd", |
| .protocol_name = "nbd+unix", |
| .instance_size = sizeof(BDRVNBDState), |
| .bdrv_parse_filename = nbd_parse_filename, |
| .bdrv_file_open = nbd_open, |
| .bdrv_co_preadv = nbd_client_co_preadv, |
| .bdrv_co_pwritev = nbd_client_co_pwritev, |
| .bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes, |
| .bdrv_close = nbd_close, |
| .bdrv_co_flush_to_os = nbd_co_flush, |
| .bdrv_co_pdiscard = nbd_client_co_pdiscard, |
| .bdrv_refresh_limits = nbd_refresh_limits, |
| .bdrv_getlength = nbd_getlength, |
| .bdrv_detach_aio_context = nbd_detach_aio_context, |
| .bdrv_attach_aio_context = nbd_attach_aio_context, |
| .bdrv_refresh_filename = nbd_refresh_filename, |
| }; |
| |
| static void bdrv_nbd_init(void) |
| { |
| bdrv_register(&bdrv_nbd); |
| bdrv_register(&bdrv_nbd_tcp); |
| bdrv_register(&bdrv_nbd_unix); |
| } |
| |
| block_init(bdrv_nbd_init); |