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/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_schema_backup_check --
* Check if a backup cursor is open and give an error if the schema
* operation will conflict. This is called after the schema operations
* have taken the schema lock so no hot backup cursor can be created until
* this is done.
*/
int
__wt_schema_backup_check(WT_SESSION_IMPL *session, const char *name)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
int i;
char **backup_list;
conn = S2C(session);
if (!conn->hot_backup)
return (0);
__wt_readlock(session, &conn->hot_backup_lock);
/*
* There is a window at the end of a backup where the list has been
* cleared from the connection but the flag is still set. It is safe
* to drop at that point.
*/
if (!conn->hot_backup ||
(backup_list = conn->hot_backup_list) == NULL) {
__wt_readunlock(session, &conn->hot_backup_lock);
return (0);
}
for (i = 0; backup_list[i] != NULL; ++i) {
if (strcmp(backup_list[i], name) == 0) {
ret = EBUSY;
break;
}
}
__wt_readunlock(session, &conn->hot_backup_lock);
return (ret);
}
/*
* __wt_schema_get_source --
* Find a matching data source or report an error.
*/
WT_DATA_SOURCE *
__wt_schema_get_source(WT_SESSION_IMPL *session, const char *name)
{
WT_NAMED_DATA_SOURCE *ndsrc;
TAILQ_FOREACH(ndsrc, &S2C(session)->dsrcqh, q)
if (WT_PREFIX_MATCH(name, ndsrc->prefix))
return (ndsrc->dsrc);
return (NULL);
}
/*
* __wt_str_name_check --
* Disallow any use of the WiredTiger name space.
*/
int
__wt_str_name_check(WT_SESSION_IMPL *session, const char *str)
{
const char *name, *sep;
int skipped;
/*
* Check if name is somewhere in the WiredTiger name space: it would be
* "bad" if the application truncated the metadata file. Skip any
* leading URI prefix, check and then skip over a table name.
*/
name = str;
for (skipped = 0; skipped < 2; skipped++) {
if ((sep = strchr(name, ':')) == NULL)
break;
name = sep + 1;
if (WT_PREFIX_MATCH(name, "WiredTiger"))
WT_RET_MSG(session, EINVAL,
"%s: the \"WiredTiger\" name space may not be "
"used by applications", name);
}
/*
* Disallow JSON quoting characters -- the config string parsing code
* supports quoted strings, but there's no good reason to use them in
* names and we're not going to do the testing.
*/
if (strpbrk(name, "{},:[]\\\"'") != NULL)
WT_RET_MSG(session, EINVAL,
"%s: WiredTiger objects should not include grouping "
"characters in their names",
name);
return (0);
}
/*
* __wt_name_check --
* Disallow any use of the WiredTiger name space.
*/
int
__wt_name_check(WT_SESSION_IMPL *session, const char *str, size_t len)
{
WT_DECL_RET;
WT_DECL_ITEM(tmp);
WT_RET(__wt_scr_alloc(session, len, &tmp));
WT_ERR(__wt_buf_fmt(session, tmp, "%.*s", (int)len, str));
ret = __wt_str_name_check(session, tmp->data);
err: __wt_scr_free(session, &tmp);
return (ret);
}
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