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authorAndrew Tridgell <tridge@samba.org>2011-09-07 15:29:32 +1000
committerAndrew Tridgell <tridge@samba.org>2011-09-08 03:35:27 +0200
commit1c25f5ebca7eb4e8a6ce95b1adf6088d67aecb94 (patch)
tree27215407729dbbceef70631d96e64191ab7b6e14 /librpc
parent6e25723c82eced9eff8c06bd645b754008824370 (diff)
downloadsamba-1c25f5ebca7eb4e8a6ce95b1adf6088d67aecb94.tar.gz
libndr: moved the NDR_* flags to have less overlap
We have 3 different types of flags values in our NDR layer. We've recently found bugs where these types of flags have been mixed up, especially by people adding hand written ndr code for tricky structures. We previously got away with this because (for example) NDR_SCALARS and NDR_IN had the same value, so mixing up the two concepts sometimes worked. Unfortunately it also led to bugs where we didn't do what was expected, such as in our smbtorture ndr test suite, where passing a ndr_flags value of zero led to only checking that two empty structures were equal. This changes the values of the NDR_IN|NDR_OUT and NDR_SCALARS|NDR_BUFFERS values to be in different bit ranges, and adds macros for checking the validity of passed in flags. A followup patch modifies the ndr calls to use these macros, and pidl to generate them. This should catch misuse of the APIs. Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
Diffstat (limited to 'librpc')
-rw-r--r--librpc/ndr/libndr.h44
1 files changed, 36 insertions, 8 deletions
diff --git a/librpc/ndr/libndr.h b/librpc/ndr/libndr.h
index 1f65ab4813c..c8edfdac393 100644
--- a/librpc/ndr/libndr.h
+++ b/librpc/ndr/libndr.h
@@ -192,7 +192,8 @@ enum ndr_err_code {
NDR_ERR_IPV6ADDRESS,
NDR_ERR_INVALID_POINTER,
NDR_ERR_UNREAD_BYTES,
- NDR_ERR_NDR64
+ NDR_ERR_NDR64,
+ NDR_ERR_FLAGS
};
#define NDR_ERR_CODE_IS_SUCCESS(x) (x == NDR_ERR_SUCCESS)
@@ -210,17 +211,44 @@ enum ndr_compression_alg {
/*
flags passed to control parse flow
+ These are deliberately in a different range to the NDR_IN/NDR_OUT
+ flags to catch mixups
*/
-#define NDR_SCALARS 1
-#define NDR_BUFFERS 2
+#define NDR_SCALARS 0x100
+#define NDR_BUFFERS 0x200
/*
- flags passed to ndr_print_*()
+ flags passed to ndr_print_*() and ndr pull/push for functions
+ These are deliberately in a different range to the NDR_SCALARS/NDR_BUFFERS
+ flags to catch mixups
*/
-#define NDR_IN 1
-#define NDR_OUT 2
-#define NDR_BOTH 3
-#define NDR_SET_VALUES 4
+#define NDR_IN 0x10
+#define NDR_OUT 0x20
+#define NDR_BOTH 0x30
+#define NDR_SET_VALUES 0x40
+
+
+#define NDR_PULL_CHECK_FLAGS(ndr, ndr_flags) do { \
+ if ((ndr_flags) & ~(NDR_SCALARS|NDR_BUFFERS)) { \
+ return ndr_pull_error(ndr, NDR_ERR_FLAGS, "Invalid pull struct ndr_flags 0x%x", ndr_flags); \
+ } \
+} while (0)
+
+#define NDR_PUSH_CHECK_FLAGS(ndr, ndr_flags) do { \
+ if ((ndr_flags) & ~(NDR_SCALARS|NDR_BUFFERS)) \
+ return ndr_push_error(ndr, NDR_ERR_FLAGS, "Invalid push struct ndr_flags 0x%x", ndr_flags); \
+} while (0)
+
+#define NDR_PULL_CHECK_FN_FLAGS(ndr, flags) do { \
+ if ((flags) & ~(NDR_BOTH|NDR_SET_VALUES)) { \
+ return ndr_pull_error(ndr, NDR_ERR_FLAGS, "Invalid fn pull flags 0x%x", flags); \
+ } \
+} while (0)
+
+#define NDR_PUSH_CHECK_FN_FLAGS(ndr, flags) do { \
+ if ((flags) & ~(NDR_BOTH|NDR_SET_VALUES)) \
+ return ndr_push_error(ndr, NDR_ERR_FLAGS, "Invalid fn push flags 0x%x", flags); \
+} while (0)
#define NDR_PULL_NEED_BYTES(ndr, n) do { \
if (unlikely((n) > ndr->data_size || ndr->offset + (n) > ndr->data_size)) { \