From 7a0571a9ff9a9adfe7563db3067f7faf81c815a9 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 31 Jan 2011 03:51:06 +0100
Subject: [PATCH] blobmsg: constify and add more validation

---
 blobmsg.c | 28 ++++++++++++++++++++++++----
 blobmsg.h |  8 ++++----
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/blobmsg.c b/blobmsg.c
index 742a93b..3e9c774 100644
--- a/blobmsg.c
+++ b/blobmsg.c
@@ -21,7 +21,7 @@ struct strbuf {
 	char *buf;
 };
 
-static bool blobmsg_puts(struct strbuf *s, char *c, int len)
+static bool blobmsg_puts(struct strbuf *s, const char *c, int len)
 {
 	if (len <= 0)
 		return true;
@@ -37,9 +37,9 @@ static bool blobmsg_puts(struct strbuf *s, char *c, int len)
 	return true;
 }
 
-static void blobmsg_format_string(struct strbuf *s, char *str)
+static void blobmsg_format_string(struct strbuf *s, const char *str)
 {
-	char *p, *last = str, *end = str + strlen(str);
+	const char *p, *last = str, *end = str + strlen(str);
 	char buf[8] = "\\u00";
 
 	blobmsg_puts(s, "\"", 1);
@@ -175,9 +175,19 @@ char *blobmsg_format_json(struct blob_attr *attr, bool list)
 	return s.buf;
 }
 
+static const int blob_type[__BLOBMSG_TYPE_LAST] = {
+	[BLOBMSG_TYPE_INT8] = BLOB_ATTR_INT8,
+	[BLOBMSG_TYPE_INT16] = BLOB_ATTR_INT16,
+	[BLOBMSG_TYPE_INT32] = BLOB_ATTR_INT32,
+	[BLOBMSG_TYPE_INT64] = BLOB_ATTR_INT64,
+	[BLOBMSG_TYPE_STRING] = BLOB_ATTR_STRING,
+};
+
 bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
 {
 	const struct blobmsg_hdr *hdr;
+	const char *data;
+	int id, len;
 
 	if (blob_len(attr) < sizeof(struct blobmsg_hdr))
 		return false;
@@ -192,7 +202,17 @@ bool blobmsg_check_attr(const struct blob_attr *attr, bool name)
 	if (hdr->name[hdr->namelen] != 0)
 		return false;
 
-	return true;
+	id = blob_id(attr);
+	len = blobmsg_data_len(attr);
+	data = blobmsg_data(attr);
+
+	if (!id || id > BLOBMSG_TYPE_LAST)
+		return false;
+
+	if (!blob_type[id])
+		return true;
+
+	return blob_check_type(data, len, blob_type[id]);
 }
 
 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
diff --git a/blobmsg.h b/blobmsg.h
index 7c63dbf..e978235 100644
--- a/blobmsg.h
+++ b/blobmsg.h
@@ -49,19 +49,19 @@ static inline int blobmsg_hdrlen(int namelen)
 	return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1);
 }
 
-static inline char *blobmsg_name(struct blob_attr *attr)
+static inline const char *blobmsg_name(const struct blob_attr *attr)
 {
 	struct blobmsg_hdr *hdr = blob_data(attr);
-	return (char *) hdr->name;
+	return (const char *) hdr->name;
 }
 
-static inline void *blobmsg_data(struct blob_attr *attr)
+static inline void *blobmsg_data(const struct blob_attr *attr)
 {
 	struct blobmsg_hdr *hdr = blob_data(attr);
 	return (char *) hdr + blobmsg_hdrlen(hdr->namelen);
 }
 
-static inline int blobmsg_data_len(struct blob_attr *attr)
+static inline int blobmsg_data_len(const struct blob_attr *attr)
 {
 	uint8_t *start, *end;
 
-- 
2.25.1