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;
}
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;
}
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;
}
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;
}
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_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;
}
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;
}