return -1;
}
if (reply->option != opt) {
- error_setg(errp, "Unexpected option type %x expected %x",
- reply->option, opt);
+ error_setg(errp, "Unexpected option type %u (%s), expected %u (%s)",
+ reply->option, nbd_opt_lookup(reply->option),
+ opt, nbd_opt_lookup(opt));
nbd_send_opt_abort(ioc);
return -1;
}
goto cleanup;
}
msg[reply->length] = '\0';
+ trace_nbd_server_error_msg(reply->type,
+ nbd_reply_type_lookup(reply->type), msg);
}
switch (reply->type) {
return result;
}
-/* Process another portion of the NBD_OPT_LIST reply. Set *@match if
- * the current reply matches @want or if the server does not support
- * NBD_OPT_LIST, otherwise leave @match alone. Return 0 if iteration
- * is complete, positive if more replies are expected, or negative
- * with @errp set if an unrecoverable error occurred. */
-static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
+/* nbd_receive_list:
+ * Process another portion of the NBD_OPT_LIST reply, populating any
+ * name received into *@name. If @description is non-NULL, and the
+ * server provided a description, that is also populated. The caller
+ * must eventually call g_free() on success.
+ * Returns 1 if name and description were set and iteration must continue,
+ * 0 if iteration is complete (including if OPT_LIST unsupported),
+ * -1 with @errp set if an unrecoverable error occurred.
+ */
+static int nbd_receive_list(QIOChannel *ioc, char **name, char **description,
Error **errp)
{
+ int ret = -1;
NBDOptionReply reply;
uint32_t len;
uint32_t namelen;
- char name[NBD_MAX_NAME_SIZE + 1];
+ char *local_name = NULL;
+ char *local_desc = NULL;
int error;
if (nbd_receive_option_reply(ioc, NBD_OPT_LIST, &reply, errp) < 0) {
}
error = nbd_handle_reply_err(ioc, &reply, errp);
if (error <= 0) {
- /* The server did not support NBD_OPT_LIST, so set *match on
- * the assumption that any name will be accepted. */
- *match = true;
return error;
}
len = reply.length;
}
return 0;
} else if (reply.type != NBD_REP_SERVER) {
- error_setg(errp, "Unexpected reply type %" PRIx32 " expected %x",
- reply.type, NBD_REP_SERVER);
+ error_setg(errp, "Unexpected reply type %u (%s), expected %u (%s)",
+ reply.type, nbd_rep_lookup(reply.type),
+ NBD_REP_SERVER, nbd_rep_lookup(NBD_REP_SERVER));
nbd_send_opt_abort(ioc);
return -1;
}
nbd_send_opt_abort(ioc);
return -1;
}
- if (namelen != strlen(want)) {
- if (nbd_drop(ioc, len, errp) < 0) {
- error_prepend(errp,
- "failed to skip export name with wrong length: ");
- nbd_send_opt_abort(ioc);
- return -1;
- }
- return 1;
- }
- assert(namelen < sizeof(name));
- if (nbd_read(ioc, name, namelen, errp) < 0) {
+ local_name = g_malloc(namelen + 1);
+ if (nbd_read(ioc, local_name, namelen, errp) < 0) {
error_prepend(errp, "failed to read export name: ");
nbd_send_opt_abort(ioc);
- return -1;
+ goto out;
}
- name[namelen] = '\0';
+ local_name[namelen] = '\0';
len -= namelen;
- if (nbd_drop(ioc, len, errp) < 0) {
- error_prepend(errp, "failed to read export description: ");
- nbd_send_opt_abort(ioc);
- return -1;
+ if (len) {
+ local_desc = g_malloc(len + 1);
+ if (nbd_read(ioc, local_desc, len, errp) < 0) {
+ error_prepend(errp, "failed to read export description: ");
+ nbd_send_opt_abort(ioc);
+ goto out;
+ }
+ local_desc[len] = '\0';
}
- if (!strcmp(name, want)) {
- *match = true;
+
+ trace_nbd_receive_list(local_name, local_desc ?: "");
+ *name = local_name;
+ local_name = NULL;
+ if (description) {
+ *description = local_desc;
+ local_desc = NULL;
}
- return 1;
+ ret = 1;
+
+ out:
+ g_free(local_name);
+ g_free(local_desc);
+ return ret;
}
return 1;
}
if (reply.type != NBD_REP_INFO) {
- error_setg(errp, "unexpected reply type %" PRIu32
- " (%s), expected %u",
- reply.type, nbd_rep_lookup(reply.type), NBD_REP_INFO);
+ error_setg(errp, "unexpected reply type %u (%s), expected %u (%s)",
+ reply.type, nbd_rep_lookup(reply.type),
+ NBD_REP_INFO, nbd_rep_lookup(NBD_REP_INFO));
nbd_send_opt_abort(ioc);
return -1;
}
const char *wantname,
Error **errp)
{
- bool foundExport = false;
+ bool list_empty = true;
+ bool found_export = false;
trace_nbd_receive_query_exports_start(wantname);
if (nbd_send_option_request(ioc, NBD_OPT_LIST, 0, NULL, errp) < 0) {
}
while (1) {
- int ret = nbd_receive_list(ioc, wantname, &foundExport, errp);
+ char *name;
+ int ret = nbd_receive_list(ioc, &name, NULL, errp);
if (ret < 0) {
/* Server gave unexpected reply */
return -1;
} else if (ret == 0) {
/* Done iterating. */
- if (!foundExport) {
+ if (list_empty) {
+ /*
+ * We don't have enough context to tell a server that
+ * sent an empty list apart from a server that does
+ * not support the list command; but as this function
+ * is just used to trigger a nicer error message
+ * before trying NBD_OPT_EXPORT_NAME, assume the
+ * export is available.
+ */
+ return 0;
+ } else if (!found_export) {
error_setg(errp, "No export with name '%s' available",
wantname);
nbd_send_opt_abort(ioc);
trace_nbd_receive_query_exports_success(wantname);
return 0;
}
+ list_empty = false;
+ if (!strcmp(name, wantname)) {
+ found_export = true;
+ }
+ g_free(name);
}
}
}
if (reply.type != NBD_REP_ACK) {
- error_setg(errp, "Unexpected reply type %" PRIx32 " expected %x",
- reply.type, NBD_REP_ACK);
+ error_setg(errp, "Unexpected reply type %u (%s), expected %u (%s)",
+ reply.type, nbd_rep_lookup(reply.type),
+ NBD_REP_ACK, nbd_rep_lookup(NBD_REP_ACK));
nbd_send_opt_abort(ioc);
return -1;
}
QIOChannel **outioc, NBDExportInfo *info,
Error **errp)
{
- char buf[256];
uint64_t magic;
int rc;
bool zeroes = true;
goto fail;
}
- if (nbd_read(ioc, buf, 8, errp) < 0) {
- error_prepend(errp, "Failed to read data: ");
- goto fail;
- }
-
- buf[8] = '\0';
- if (strlen(buf) == 0) {
- error_setg(errp, "Server connection closed unexpectedly");
+ if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
+ error_prepend(errp, "Failed to read initial magic: ");
goto fail;
}
-
- magic = ldq_be_p(buf);
+ magic = be64_to_cpu(magic);
trace_nbd_receive_negotiate_magic(magic);
- if (memcmp(buf, "NBDMAGIC", 8) != 0) {
- error_setg(errp, "Invalid magic received");
+ if (magic != NBD_INIT_MAGIC) {
+ error_setg(errp, "Bad initial magic received: 0x%" PRIx64, magic);
goto fail;
}
if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
- error_prepend(errp, "Failed to read magic: ");
+ error_prepend(errp, "Failed to read server magic: ");
goto fail;
}
magic = be64_to_cpu(magic);
}
info->flags = oldflags;
} else {
- error_setg(errp, "Bad magic received");
+ error_setg(errp, "Bad server magic received: 0x%" PRIx64, magic);
goto fail;
}
return 0;
}
-#else
-int nbd_init(int fd, QIOChannelSocket *ioc, NBDExportInfo *info,
- Error **errp)
-{
- error_setg(errp, "nbd_init is only supported on Linux");
- return -ENOTSUP;
-}
-
-int nbd_client(int fd)
-{
- return -ENOTSUP;
-}
-int nbd_disconnect(int fd)
-{
- return -ENOTSUP;
-}
-#endif
+#endif /* __linux__ */
int nbd_send_request(QIOChannel *ioc, NBDRequest *request)
{
projects / qemu.git / blobdiff