Exemple #1
0
static void *nbd_client_thread(void *arg)
{
    char *device = arg;
    off_t size;
    size_t blocksize;
    uint32_t nbdflags;
    int fd, sock;
    int ret;
    pthread_t show_parts_thread;

    sock = unix_socket_outgoing(sockpath);
    if (sock < 0) {
        goto out;
    }

    ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
                                &size, &blocksize);
    if (ret < 0) {
        goto out_socket;
    }

    fd = open(device, O_RDWR);
    if (fd < 0) {
        /* Linux-only, we can use %m in printf.  */
        fprintf(stderr, "Failed to open %s: %m", device);
        goto out_socket;
    }

    ret = nbd_init(fd, sock, nbdflags, size, blocksize);
    if (ret < 0) {
        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);
    kill(getpid(), SIGTERM);
    return (void *) EXIT_SUCCESS;

out_fd:
    close(fd);
out_socket:
    closesocket(sock);
out:
    kill(getpid(), SIGTERM);
    return (void *) EXIT_FAILURE;
}
static int nbd_open(BlockDriverState *bs, const char* filename, int flags)
{
    BDRVNBDState *s = bs->opaque;
    const char *host;
    const char *unixpath;
    int sock;
    off_t size;
    size_t blocksize;
    int ret;

    if ((flags & BDRV_O_CREAT))
        return -EINVAL;

    if (!strstart(filename, "nbd:", &host))
        return -EINVAL;

    if (strstart(host, "unix:", &unixpath)) {

        if (unixpath[0] != '/')
            return -EINVAL;

        sock = unix_socket_outgoing(unixpath);

    } else {
        uint16_t port;
        char *p, *r;
        char hostname[128];

        pstrcpy(hostname, 128, host);

        p = strchr(hostname, ':');
        if (p == NULL)
            return -EINVAL;

        *p = '\0';
        p++;

        port = strtol(p, &r, 0);
        if (r == p)
            return -EINVAL;
        sock = tcp_socket_outgoing(hostname, port);
    }

    if (sock == -1)
        return -errno;

    ret = nbd_receive_negotiate(sock, &size, &blocksize);
    if (ret == -1)
        return -errno;

    s->sock = sock;
    s->size = size;
    s->blocksize = blocksize;

    return 0;
}
Exemple #3
0
static void *nbd_client_thread(void *arg)
{
    int fd = *(int *)arg;
    off_t size;
    size_t blocksize;
    uint32_t nbdflags;
    int sock;
    int ret;
    pthread_t show_parts_thread;

    do {
        sock = unix_socket_outgoing(sockpath);
        if (sock == -1) {
            goto out;
        }
    } while (sock == -1);

    ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
                                &size, &blocksize);
    if (ret == -1) {
        goto out;
    }

    ret = nbd_init(fd, sock, nbdflags, size, blocksize);
    if (ret == -1) {
        goto out;
    }

    /* update partition table */
    pthread_create(&show_parts_thread, NULL, show_parts, NULL);

    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;
    }
    close(fd);
    kill(getpid(), SIGTERM);
    return (void *) EXIT_SUCCESS;

out:
    kill(getpid(), SIGTERM);
    return (void *) EXIT_FAILURE;
}
Exemple #4
0
static int nbd_establish_connection(BlockDriverState *bs)
{
    BDRVNBDState *s = bs->opaque;
    int sock;
    int ret;
    off_t size;
    size_t blocksize;

    if (s->host_spec[0] == '/') {
        sock = unix_socket_outgoing(s->host_spec);
    } else {
        sock = tcp_socket_outgoing_spec(s->host_spec);
    }

    /* Failed to establish connection */
    if (sock < 0) {
        logout("Failed to establish connection to NBD server\n");
        return -errno;
    }

    /* NBD handshake */
    ret = nbd_receive_negotiate(sock, s->export_name, &s->nbdflags, &size,
                                &blocksize);
    if (ret < 0) {
        logout("Failed to negotiate with the NBD server\n");
        closesocket(sock);
        return ret;
    }

    /* Now that we're connected, set the socket to be non-blocking and
     * kick the reply mechanism.  */
    socket_set_nonblock(sock);
    qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL,
                            nbd_have_request, s);

    s->sock = sock;
    s->size = size;
    s->blocksize = blocksize;

    logout("Established connection with NBD server\n");
    return 0;
}
Exemple #5
0
int main(int argc, char **argv)
{
    BlockDriverState *bs;
    off_t dev_offset = 0;
    off_t offset = 0;
    bool readonly = false;
    bool disconnect = false;
    const char *bindto = "0.0.0.0";
    int port = NBD_DEFAULT_PORT;
    struct sockaddr_in addr;
    socklen_t addr_len = sizeof(addr);
    off_t fd_size;
    char *device = NULL;
    char *socket = NULL;
    char sockpath[128];
    const char *sopt = "hVb:o:p:rsnP:c:dvk:e:t";
    struct option lopt[] = {
        { "help", 0, NULL, 'h' },
        { "version", 0, NULL, 'V' },
        { "bind", 1, NULL, 'b' },
        { "port", 1, NULL, 'p' },
        { "socket", 1, NULL, 'k' },
        { "offset", 1, NULL, 'o' },
        { "read-only", 0, NULL, 'r' },
        { "partition", 1, NULL, 'P' },
        { "connect", 1, NULL, 'c' },
        { "disconnect", 0, NULL, 'd' },
        { "snapshot", 0, NULL, 's' },
        { "nocache", 0, NULL, 'n' },
        { "shared", 1, NULL, 'e' },
        { "persistent", 0, NULL, 't' },
        { "verbose", 0, NULL, 'v' },
        { NULL, 0, NULL, 0 }
    };
    int ch;
    int opt_ind = 0;
    int li;
    char *end;
    int flags = BDRV_O_RDWR;
    int partition = -1;
    int ret;
    int shared = 1;
    uint8_t *data;
    fd_set fds;
    int *sharing_fds;
    int fd;
    int i;
    int nb_fds = 0;
    int max_fd;
    int persistent = 0;
    uint32_t nbdflags;

    while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
        switch (ch) {
        case 's':
            flags |= BDRV_O_SNAPSHOT;
            break;
        case 'n':
            flags |= BDRV_O_NOCACHE;
            break;
        case 'b':
            bindto = optarg;
            break;
        case 'p':
            li = strtol(optarg, &end, 0);
            if (*end) {
                errx(EXIT_FAILURE, "Invalid port `%s'", optarg);
            }
            if (li < 1 || li > 65535) {
                errx(EXIT_FAILURE, "Port out of range `%s'", optarg);
            }
            port = (uint16_t)li;
            break;
        case 'o':
                dev_offset = strtoll (optarg, &end, 0);
            if (*end) {
                errx(EXIT_FAILURE, "Invalid offset `%s'", optarg);
            }
            if (dev_offset < 0) {
                errx(EXIT_FAILURE, "Offset must be positive `%s'", optarg);
            }
            break;
        case 'r':
            readonly = true;
            flags &= ~BDRV_O_RDWR;
            break;
        case 'P':
            partition = strtol(optarg, &end, 0);
            if (*end)
                errx(EXIT_FAILURE, "Invalid partition `%s'", optarg);
            if (partition < 1 || partition > 8)
                errx(EXIT_FAILURE, "Invalid partition %d", partition);
            break;
        case 'k':
            socket = optarg;
            if (socket[0] != '/')
                errx(EXIT_FAILURE, "socket path must be absolute\n");
            break;
        case 'd':
            disconnect = true;
            break;
        case 'c':
            device = optarg;
            break;
        case 'e':
            shared = strtol(optarg, &end, 0);
            if (*end) {
                errx(EXIT_FAILURE, "Invalid shared device number '%s'", optarg);
            }
            if (shared < 1) {
                errx(EXIT_FAILURE, "Shared device number must be greater than 0\n");
            }
            break;
	case 't':
	    persistent = 1;
	    break;
        case 'v':
            verbose = 1;
            break;
        case 'V':
            version(argv[0]);
            exit(0);
            break;
        case 'h':
            usage(argv[0]);
            exit(0);
            break;
        case '?':
            errx(EXIT_FAILURE, "Try `%s --help' for more information.",
                 argv[0]);
        }
    }

    if ((argc - optind) != 1) {
        errx(EXIT_FAILURE, "Invalid number of argument.\n"
             "Try `%s --help' for more information.",
             argv[0]);
    }

    if (disconnect) {
        fd = open(argv[optind], O_RDWR);
        if (fd == -1)
            err(EXIT_FAILURE, "Cannot open %s", argv[optind]);

        nbd_disconnect(fd);

        close(fd);

        printf("%s disconnected\n", argv[optind]);

	return 0;
    }

    bdrv_init();

    bs = bdrv_new("hda");
    if (bs == NULL)
        return 1;

    if ((ret = bdrv_open(bs, argv[optind], flags, NULL)) < 0) {
        errno = -ret;
        err(EXIT_FAILURE, "Failed to bdrv_open '%s'", argv[optind]);
    }

    fd_size = bs->total_sectors * 512;

    if (partition != -1 &&
        find_partition(bs, partition, &dev_offset, &fd_size))
        err(EXIT_FAILURE, "Could not find partition %d", partition);

    if (device) {
        pid_t pid;
        int sock;

        /* want to fail before daemonizing */
        if (access(device, R_OK|W_OK) == -1) {
            err(EXIT_FAILURE, "Could not access '%s'", device);
        }

        if (!verbose) {
            /* detach client and server */
            if (daemon(0, 0) == -1) {
                err(EXIT_FAILURE, "Failed to daemonize");
            }
        }

        if (socket == NULL) {
            snprintf(sockpath, sizeof(sockpath), SOCKET_PATH,
                     basename(device));
            socket = sockpath;
        }

        pid = fork();
        if (pid < 0)
            return 1;
        if (pid != 0) {
            off_t size;
            size_t blocksize;

            ret = 0;
            bdrv_close(bs);

            do {
                sock = unix_socket_outgoing(socket);
                if (sock == -1) {
                    if (errno != ENOENT && errno != ECONNREFUSED) {
                        ret = 1;
                        goto out;
                    }
                    sleep(1);	/* wait children */
                }
            } while (sock == -1);

            fd = open(device, O_RDWR);
            if (fd == -1) {
                ret = 1;
                goto out;
            }

            ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
					&size, &blocksize);
            if (ret == -1) {
                ret = 1;
                goto out;
            }

            ret = nbd_init(fd, sock, size, blocksize);
            if (ret == -1) {
                ret = 1;
                goto out;
            }

            printf("NBD device %s is now connected to file %s\n",
                    device, argv[optind]);

	    /* update partition table */

            show_parts(device);

            ret = nbd_client(fd);
            if (ret) {
                ret = 1;
            }
            close(fd);
 out:
            kill(pid, SIGTERM);
            unlink(socket);

            return ret;
        }
        /* children */
    }

    sharing_fds = qemu_malloc((shared + 1) * sizeof(int));

    if (socket) {
        sharing_fds[0] = unix_socket_incoming(socket);
    } else {
        sharing_fds[0] = tcp_socket_incoming(bindto, port);
    }

    if (sharing_fds[0] == -1)
        return 1;
    max_fd = sharing_fds[0];
    nb_fds++;

    data = qemu_blockalign(bs, NBD_BUFFER_SIZE);
    if (data == NULL)
        errx(EXIT_FAILURE, "Cannot allocate data buffer");

    do {

        FD_ZERO(&fds);
        for (i = 0; i < nb_fds; i++)
            FD_SET(sharing_fds[i], &fds);

        ret = select(max_fd + 1, &fds, NULL, NULL, NULL);
        if (ret == -1)
            break;

        if (FD_ISSET(sharing_fds[0], &fds))
            ret--;
        for (i = 1; i < nb_fds && ret; i++) {
            if (FD_ISSET(sharing_fds[i], &fds)) {
                if (nbd_trip(bs, sharing_fds[i], fd_size, dev_offset,
                    &offset, readonly, data, NBD_BUFFER_SIZE) != 0) {
                    close(sharing_fds[i]);
                    nb_fds--;
                    sharing_fds[i] = sharing_fds[nb_fds];
                    i--;
                }
                ret--;
            }
        }
        /* new connection ? */
        if (FD_ISSET(sharing_fds[0], &fds)) {
            if (nb_fds < shared + 1) {
                sharing_fds[nb_fds] = accept(sharing_fds[0],
                                             (struct sockaddr *)&addr,
                                             &addr_len);
                if (sharing_fds[nb_fds] != -1 &&
                    nbd_negotiate(sharing_fds[nb_fds], fd_size) != -1) {
                        if (sharing_fds[nb_fds] > max_fd)
                            max_fd = sharing_fds[nb_fds];
                        nb_fds++;
                }
            }
        }
    } while (persistent || nb_fds > 1);
    qemu_vfree(data);

    close(sharing_fds[0]);
    bdrv_close(bs);
    qemu_free(sharing_fds);
    if (socket)
        unlink(socket);

    return 0;
}
Exemple #6
0
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;
}
Exemple #7
0
static void *nbd_client_thread(void *arg)
{
    char *device = arg;
    off_t size;
    uint32_t nbdflags;
    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, &nbdflags,
                                NULL, NULL, NULL,
                                &size, &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, nbdflags, size);
    if (ret < 0) {
        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;
}
Exemple #8
0
static int nbd_open(BlockDriverState *bs, const char* filename, int flags)
{
    BDRVNBDState *s = bs->opaque;
    uint32_t nbdflags;

    char *file;
    char *name;
    const char *host;
    const char *unixpath;
    int sock;
    off_t size;
    size_t blocksize;
    int ret;
    int err = -EINVAL;

    file = qemu_strdup(filename);

    name = strstr(file, EN_OPTSTR);
    if (name) {
        if (name[strlen(EN_OPTSTR)] == 0) {
            goto out;
        }
        name[0] = 0;
        name += strlen(EN_OPTSTR);
    }

    if (!strstart(file, "nbd:", &host)) {
        goto out;
    }

    if (strstart(host, "unix:", &unixpath)) {

        if (unixpath[0] != '/') {
            goto out;
        }

        sock = unix_socket_outgoing(unixpath);

    } else {
        uint16_t port = NBD_DEFAULT_PORT;
        char *p, *r;
        char hostname[128];

        pstrcpy(hostname, 128, host);

        p = strchr(hostname, ':');
        if (p != NULL) {
            *p = '\0';
            p++;

            port = strtol(p, &r, 0);
            if (r == p) {
                goto out;
            }
        } else if (name == NULL) {
            goto out;
        }

        sock = tcp_socket_outgoing(hostname, port);
    }

    if (sock == -1) {
        err = -errno;
        goto out;
    }

    ret = nbd_receive_negotiate(sock, name, &nbdflags, &size, &blocksize);
    if (ret == -1) {
        err = -errno;
        goto out;
    }

    s->sock = sock;
    s->size = size;
    s->blocksize = blocksize;
    err = 0;

out:
    qemu_free(file);
    return err;
}