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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v3 23/25] tools/xenstore: merge is_valid_nodename() into canonicalize()
Today is_valid_nodename() is always called directly after calling
canonicalize(), with the exception of do_unwatch(), where the call
is missing (which is not correct, but results just in a wrong error
reason being returned).
Merge is_valid_nodename() into canonicalize(). While at it merge
valid_chars() into it, too.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V3:
- new patch
---
tools/xenstore/xenstored_core.c | 89 ++++++++++++++------------------
tools/xenstore/xenstored_core.h | 6 +--
tools/xenstore/xenstored_watch.c | 16 ++----
3 files changed, 45 insertions(+), 66 deletions(-)
diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index ea5a1a9cce..ec20bc042d 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -1210,42 +1210,6 @@ void send_ack(struct connection *conn, enum
xsd_sockmsg_type type)
send_reply(conn, type, "OK", sizeof("OK"));
}
-static bool valid_chars(const char *node)
-{
- /* Nodes can have lots of crap. */
- return (strspn(node,
- "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- "abcdefghijklmnopqrstuvwxyz"
- "0123456789-/_@") == strlen(node));
-}
-
-bool is_valid_nodename(const struct connection *conn, const char *node,
- bool allow_special)
-{
- int local_off = 0;
- unsigned int domid;
-
- /* Must start in / or - if special nodes are allowed - in @. */
- if (!strstarts(node, "/") && (!allow_special || !strstarts(node, "@")))
- return false;
-
- /* Cannot end in / (unless it's just "/"). */
- if (strends(node, "/") && !streq(node, "/"))
- return false;
-
- /* No double //. */
- if (strstr(node, "//"))
- return false;
-
- if (sscanf(node, "/local/domain/%5u/%n", &domid, &local_off) != 1)
- local_off = 0;
-
- if (domain_max_chk(conn, ACC_PATHLEN, strlen(node) - local_off))
- return false;
-
- return valid_chars(node);
-}
-
/* We expect one arg in the input: return NULL otherwise.
* The payload must contain exactly one nul, at the end.
*/
@@ -1279,16 +1243,46 @@ static char *perms_to_strings(const void *ctx, const
struct node_perms *perms,
}
const char *canonicalize(struct connection *conn, const void *ctx,
- const char *node)
+ const char *node, bool allow_special)
{
- const char *prefix;
+ char *name;
+ int local_off = 0;
+ unsigned int domid;
- if (!node || (node[0] == '/') || (node[0] == '@'))
- return node;
- prefix = get_implicit_path(conn);
- if (prefix)
- return talloc_asprintf(ctx, "%s/%s", prefix, node);
- return node;
+ errno = EINVAL;
+ if (!node)
+ return NULL;
+
+ if (strspn(node, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+ "0123456789-/_@") != strlen(node))
+ return NULL;
+
+ if (node[0] == '@' && !allow_special)
+ return NULL;
+
+ if (node[0] != '/' && node[0] != '@') {
+ name = talloc_asprintf(ctx, "%s/%s", get_implicit_path(conn),
+ node);
+ if (!name)
+ return NULL;
+ } else
+ name = (char *)node;
+
+ /* Cannot end in / (unless it's just "/"). */
+ if (strends(name, "/") && !streq(name, "/"))
+ return NULL;
+
+ /* No double //. */
+ if (strstr(name, "//"))
+ return NULL;
+
+ if (sscanf(name, "/local/domain/%5u/%n", &domid, &local_off) != 1)
+ local_off = 0;
+
+ if (domain_max_chk(conn, ACC_PATHLEN, strlen(name) - local_off))
+ return NULL;
+
+ return name;
}
static struct node *get_node_canonicalized(struct connection *conn,
@@ -1302,13 +1296,10 @@ static struct node *get_node_canonicalized(struct
connection *conn,
if (!canonical_name)
canonical_name = &tmp_name;
- *canonical_name = canonicalize(conn, ctx, name);
+ *canonical_name = canonicalize(conn, ctx, name, allow_special);
if (!*canonical_name)
return NULL;
- if (!is_valid_nodename(conn, *canonical_name, allow_special)) {
- errno = EINVAL;
- return NULL;
- }
+
return get_node(conn, ctx, *canonical_name, perm);
}
diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h
index f3a83efce8..ec1d6aac27 100644
--- a/tools/xenstore/xenstored_core.h
+++ b/tools/xenstore/xenstored_core.h
@@ -241,7 +241,7 @@ void send_ack(struct connection *conn, enum
xsd_sockmsg_type type);
/* Canonicalize this path if possible. */
const char *canonicalize(struct connection *conn, const void *ctx,
- const char *node);
+ const char *node, bool allow_special);
/* Get access permissions. */
unsigned int perm_for_conn(struct connection *conn,
@@ -294,10 +294,6 @@ struct connection *get_connection_by_id(unsigned int
conn_id);
void check_store(void);
void corrupt(struct connection *conn, const char *fmt, ...);
-/* Is this a valid node name? */
-bool is_valid_nodename(const struct connection *conn, const char *node,
- bool allow_special);
-
/* Get name of parent node. */
char *get_parent(const void *ctx, const char *node);
diff --git a/tools/xenstore/xenstored_watch.c b/tools/xenstore/xenstored_watch.c
index 2662a3fa49..247d37e80f 100644
--- a/tools/xenstore/xenstored_watch.c
+++ b/tools/xenstore/xenstored_watch.c
@@ -167,17 +167,9 @@ static int check_watch_path(struct connection *conn, const
void *ctx,
const char **path, bool *relative)
{
*relative = !strstarts(*path, "/") && !strstarts(*path, "@");
- *path = canonicalize(conn, ctx, *path);
- if (!*path)
- return errno;
- if (!is_valid_nodename(conn, *path, true))
- goto inval;
-
- return 0;
+ *path = canonicalize(conn, ctx, *path, true);
- inval:
- errno = EINVAL;
- return errno;
+ return *path ? 0 : errno;
}
static struct watch *add_watch(struct connection *conn, const char *path,
@@ -261,9 +253,9 @@ int do_unwatch(const void *ctx, struct connection *conn,
if (get_strings(in, vec, ARRAY_SIZE(vec)) != ARRAY_SIZE(vec))
return EINVAL;
- node = canonicalize(conn, ctx, vec[0]);
+ node = canonicalize(conn, ctx, vec[0], true);
if (!node)
- return ENOMEM;
+ return errno;
list_for_each_entry(watch, &conn->watches, list) {
if (streq(watch->node, node) && streq(watch->token, vec[1])) {
list_del(&watch->list);
--
2.35.3
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