Share ndr.c implementation.

1 files changed, 1118 insertions, 0 deletions

diff --git a/librpc/ndr/ndr.c b/librpc/ndr/ndr.c
new file mode 100644
index 0000000000..2f1daeaeb5
--- /dev/null
+++ b/librpc/ndr/ndr.c
@@ -0,0 +1,1118 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   libndr interface
+
+   Copyright (C) Andrew Tridgell 2003
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+  this provides the core routines for NDR parsing functions
+
+  see http://www.opengroup.org/onlinepubs/9629399/chap14.htm for details
+  of NDR encoding rules
+*/
+
+#include "includes.h"
+#include "librpc/ndr/libndr.h"
+#include "../lib/util/dlinklist.h"
+#if _SAMBA_BUILD_ == 4
+#include "param/param.h"
+#endif
+
+#define NDR_BASE_MARSHALL_SIZE 1024
+
+/* this guid indicates NDR encoding in a protocol tower */
+const struct ndr_syntax_id ndr_transfer_syntax = {
+  { 0x8a885d04, 0x1ceb, 0x11c9, {0x9f, 0xe8}, {0x08,0x00,0x2b,0x10,0x48,0x60} },
+  2
+};
+
+const struct ndr_syntax_id ndr64_transfer_syntax = {
+  { 0x71710533, 0xbeba, 0x4937, {0x83, 0x19}, {0xb5,0xdb,0xef,0x9c,0xcc,0x36} },
+  1
+};
+
+/*
+  work out the number of bytes needed to align on a n byte boundary
+*/
+_PUBLIC_ size_t ndr_align_size(uint32_t offset, size_t n)
+{
+	if ((offset & (n-1)) == 0) return 0;
+	return n - (offset & (n-1));
+}
+
+/*
+  initialise a ndr parse structure from a data blob
+*/
+_PUBLIC_ struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience)
+{
+	struct ndr_pull *ndr;
+
+	ndr = talloc_zero(mem_ctx, struct ndr_pull);
+	if (!ndr) return NULL;
+	ndr->current_mem_ctx = mem_ctx;
+
+	ndr->data = blob->data;
+	ndr->data_size = blob->length;
+	ndr->iconv_convenience = talloc_reference(ndr, iconv_convenience);
+
+	return ndr;
+}
+
+/*
+  advance by 'size' bytes
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_advance(struct ndr_pull *ndr, uint32_t size)
+{
+	ndr->offset += size;
+	if (ndr->offset > ndr->data_size) {
+		return ndr_pull_error(ndr, NDR_ERR_BUFSIZE, 
+				      "ndr_pull_advance by %u failed",
+				      size);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  set the parse offset to 'ofs'
+*/
+static enum ndr_err_code ndr_pull_set_offset(struct ndr_pull *ndr, uint32_t ofs)
+{
+	ndr->offset = ofs;
+	if (ndr->offset > ndr->data_size) {
+		return ndr_pull_error(ndr, NDR_ERR_BUFSIZE, 
+				      "ndr_pull_set_offset %u failed",
+				      ofs);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/* create a ndr_push structure, ready for some marshalling */
+_PUBLIC_ struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience)
+{
+	struct ndr_push *ndr;
+
+	ndr = talloc_zero(mem_ctx, struct ndr_push);
+	if (!ndr) {
+		return NULL;
+	}
+
+	ndr->flags = 0;
+	ndr->alloc_size = NDR_BASE_MARSHALL_SIZE;
+	ndr->data = talloc_array(ndr, uint8_t, ndr->alloc_size);
+	if (!ndr->data) {
+		return NULL;
+	}
+	ndr->iconv_convenience = talloc_reference(ndr, iconv_convenience);
+
+	return ndr;
+}
+
+/* return a DATA_BLOB structure for the current ndr_push marshalled data */
+_PUBLIC_ DATA_BLOB ndr_push_blob(struct ndr_push *ndr)
+{
+	DATA_BLOB blob;
+	blob = data_blob_const(ndr->data, ndr->offset);
+	if (ndr->alloc_size > ndr->offset) {
+		ndr->data[ndr->offset] = 0;
+	}
+	return blob;
+}
+
+
+/*
+  expand the available space in the buffer to ndr->offset + extra_size
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_expand(struct ndr_push *ndr, uint32_t extra_size)
+{
+	uint32_t size = extra_size + ndr->offset;
+
+	if (size < ndr->offset) {
+		/* extra_size overflowed the offset */
+		return ndr_push_error(ndr, NDR_ERR_BUFSIZE, "Overflow in push_expand to %u",
+				      size);
+	}
+
+	if (ndr->alloc_size > size) {
+		return NDR_ERR_SUCCESS;
+	}
+
+	ndr->alloc_size += NDR_BASE_MARSHALL_SIZE;
+	if (size+1 > ndr->alloc_size) {
+		ndr->alloc_size = size+1;
+	}
+	ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->alloc_size);
+	if (!ndr->data) {
+		return ndr_push_error(ndr, NDR_ERR_ALLOC, "Failed to push_expand to %u",
+				      ndr->alloc_size);
+	}
+
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...) 
+{
+	va_list ap;
+	char *s = NULL;
+	int i, ret;
+
+	va_start(ap, format);
+	ret = vasprintf(&s, format, ap);
+	va_end(ap);
+
+	if (ret == -1) {
+		return;
+	}
+
+	for (i=0;i<ndr->depth;i++) {
+		DEBUGADD(0,("    "));
+	}
+
+	DEBUGADD(0,("%s\n", s));
+	free(s);
+}
+
+_PUBLIC_ void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...)
+{
+	va_list ap;
+	int i;
+
+	for (i=0;i<ndr->depth;i++) {
+		ndr->private_data = talloc_asprintf_append_buffer(
+					(char *)ndr->private_data, "    ");
+	}
+
+	va_start(ap, format);
+	ndr->private_data = talloc_vasprintf_append_buffer((char *)ndr->private_data, 
+						    format, ap);
+	va_end(ap);
+	ndr->private_data = talloc_asprintf_append_buffer((char *)ndr->private_data, 
+						   "\n");
+}
+
+/*
+  a useful helper function for printing idl structures via DEBUG()
+*/
+_PUBLIC_ void ndr_print_debug(ndr_print_fn_t fn, const char *name, void *ptr)
+{
+	struct ndr_print *ndr;
+
+	ndr = talloc_zero(NULL, struct ndr_print);
+	if (!ndr) return;
+	ndr->print = ndr_print_debug_helper;
+	ndr->depth = 1;
+	ndr->flags = 0;
+	fn(ndr, name, ptr);
+	talloc_free(ndr);
+}
+
+/*
+  a useful helper function for printing idl unions via DEBUG()
+*/
+_PUBLIC_ void ndr_print_union_debug(ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
+{
+	struct ndr_print *ndr;
+
+	ndr = talloc_zero(NULL, struct ndr_print);
+	if (!ndr) return;
+	ndr->print = ndr_print_debug_helper;
+	ndr->depth = 1;
+	ndr->flags = 0;
+	ndr_print_set_switch_value(ndr, ptr, level);
+	fn(ndr, name, ptr);
+	talloc_free(ndr);
+}
+
+/*
+  a useful helper function for printing idl function calls via DEBUG()
+*/
+_PUBLIC_ void ndr_print_function_debug(ndr_print_function_t fn, const char *name, int flags, void *ptr)
+{
+	struct ndr_print *ndr;
+
+	ndr = talloc_zero(NULL, struct ndr_print);
+	if (!ndr) return;
+	ndr->print = ndr_print_debug_helper;
+	ndr->depth = 1;
+	ndr->flags = 0;
+	fn(ndr, name, flags, ptr);
+	talloc_free(ndr);
+}
+
+/*
+  a useful helper function for printing idl structures to a string
+*/
+_PUBLIC_ char *ndr_print_struct_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, void *ptr)
+{
+	struct ndr_print *ndr;
+	char *ret = NULL;
+
+	ndr = talloc_zero(mem_ctx, struct ndr_print);
+	if (!ndr) return NULL;
+	ndr->private_data = talloc_strdup(ndr, "");
+	if (!ndr->private_data) {
+		goto failed;
+	}
+	ndr->print = ndr_print_string_helper;
+	ndr->depth = 1;
+	ndr->flags = 0;
+	fn(ndr, name, ptr);
+	ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
+failed:
+	talloc_free(ndr);
+	return ret;
+}
+
+/*
+  a useful helper function for printing idl unions to a string
+*/
+_PUBLIC_ char *ndr_print_union_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
+{
+	struct ndr_print *ndr;
+	char *ret = NULL;
+
+	ndr = talloc_zero(mem_ctx, struct ndr_print);
+	if (!ndr) return NULL;
+	ndr->private_data = talloc_strdup(ndr, "");
+	if (!ndr->private_data) {
+		goto failed;
+	}
+	ndr->print = ndr_print_string_helper;
+	ndr->depth = 1;
+	ndr->flags = 0;
+	ndr_print_set_switch_value(ndr, ptr, level);
+	fn(ndr, name, ptr);
+	ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
+failed:
+	talloc_free(ndr);
+	return ret;
+}
+
+/*
+  a useful helper function for printing idl function calls to a string
+*/
+_PUBLIC_ char *ndr_print_function_string(TALLOC_CTX *mem_ctx,
+				ndr_print_function_t fn, const char *name, 
+				int flags, void *ptr)
+{
+	struct ndr_print *ndr;
+	char *ret = NULL;
+
+	ndr = talloc_zero(mem_ctx, struct ndr_print);
+	if (!ndr) return NULL;
+	ndr->private_data = talloc_strdup(ndr, "");
+	if (!ndr->private_data) {
+		goto failed;
+	}
+	ndr->print = ndr_print_string_helper;
+	ndr->depth = 1;
+	ndr->flags = 0;
+	fn(ndr, name, flags, ptr);
+	ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
+failed:
+	talloc_free(ndr);
+	return ret;
+}
+
+_PUBLIC_ void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
+{
+	/* the big/little endian flags are inter-dependent */
+	if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
+		(*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
+	}
+	if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
+		(*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
+	}
+	if (new_flags & LIBNDR_FLAG_REMAINING) {
+		(*pflags) &= ~LIBNDR_ALIGN_FLAGS;
+	}
+	if (new_flags & LIBNDR_ALIGN_FLAGS) {
+		(*pflags) &= ~LIBNDR_FLAG_REMAINING;
+	}
+	(*pflags) |= new_flags;
+}
+
+/*
+  return and possibly log an NDR error
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_error(struct ndr_pull *ndr,
+				 enum ndr_err_code ndr_err,
+				 const char *format, ...)
+{
+	char *s=NULL;
+	va_list ap;
+	int ret;
+
+	va_start(ap, format);
+	ret = vasprintf(&s, format, ap);
+	va_end(ap);
+
+	if (ret == -1) {
+		return NDR_ERR_ALLOC;
+	}
+
+	DEBUG(1,("ndr_pull_error(%u): %s\n", ndr_err, s));
+
+	free(s);
+
+	return ndr_err;
+}
+
+/*
+  return and possibly log an NDR error
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_error(struct ndr_push *ndr,
+				 enum ndr_err_code ndr_err,
+				 const char *format, ...) 
+{
+	char *s=NULL;
+	va_list ap;
+	int ret;
+
+	va_start(ap, format);
+	ret = vasprintf(&s, format, ap);
+	va_end(ap);
+
+	if (ret == -1) {
+		return NDR_ERR_ALLOC;
+	}
+
+	DEBUG(1,("ndr_push_error(%u): %s\n", ndr_err, s));
+
+	free(s);
+
+	return ndr_err;
+}
+
+/*
+  handle subcontext buffers, which in midl land are user-marshalled, but
+  we use magic in pidl to make them easier to cope with
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_subcontext_start(struct ndr_pull *ndr,
+				   struct ndr_pull **_subndr,
+				   size_t header_size,
+				   ssize_t size_is)
+{
+	struct ndr_pull *subndr;
+	uint32_t r_content_size;
+	bool force_le = false;
+	bool force_be = false;
+
+	switch (header_size) {
+	case 0: {
+		uint32_t content_size = ndr->data_size - ndr->offset;
+		if (size_is >= 0) {
+			content_size = size_is;
+		}
+		r_content_size = content_size;
+		break;
+	}
+
+	case 2: {
+		uint16_t content_size;
+		NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
+		if (size_is >= 0 && size_is != content_size) {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d", 
+						(int)size_is, (int)content_size);
+		}
+		r_content_size = content_size;
+		break;
+	}
+
+	case 4: {
+		uint32_t content_size;
+		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
+		if (size_is >= 0 && size_is != content_size) {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d", 
+						(int)size_is, (int)content_size);
+		}
+		r_content_size = content_size;
+		break;
+	}
+	case 0xFFFFFC01: {
+		/*
+		 * Common Type Header for the Serialization Stream
+		 * See [MS-RPCE] 2.2.6 Type Serialization Version 1
+		 */
+		uint8_t version;
+		uint8_t drep;
+		uint16_t hdrlen;
+		uint32_t filler;
+		uint32_t content_size;
+		uint32_t reserved;
+
+		/* version */
+		NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &version));
+
+		if (version != 1) {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
+					      "Bad subcontext (PULL) Common Type Header version %d != 1",
+					      (int)version);
+		}
+
+		/*
+		 * 0x10 little endian
+		 * 0x00 big endian
+		 */
+		NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &drep));
+		if (drep == 0x10) {
+			force_le = true;
+		} else if (drep == 0x00) {
+			force_be = true;
+		} else {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
+					      "Bad subcontext (PULL) Common Type Header invalid drep 0x%02X",
+					      (unsigned int)drep);
+		}
+
+		/* length of the "Private Header for Constructed Type" */
+		NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &hdrlen));
+		if (hdrlen != 8) {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
+					      "Bad subcontext (PULL) Common Type Header length %d != 8",
+					      (int)hdrlen);
+		}
+
+		/* filler should be ignored */
+		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &filler));
+
+		/*
+		 * Private Header for Constructed Type
+		 */
+		/* length - will be updated latter */
+		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
+		if (size_is >= 0 && size_is != content_size) {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
+					      (int)size_is, (int)content_size);
+		}
+		/* the content size must be a multiple of 8 */
+		if ((content_size % 8) != 0) {
+			return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
+					      "Bad subcontext (PULL) size_is(%d) not padded to 8 content_size %d",
+					      (int)size_is, (int)content_size);
+		}
+		r_content_size = content_size;
+
+		/* reserved */
+		NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &reserved));
+		break;
+	}
+	default:
+		return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d", 
+				      (int)header_size);
+	}
+
+	NDR_PULL_NEED_BYTES(ndr, r_content_size);
+
+	subndr = talloc_zero(ndr, struct ndr_pull);
+	NDR_ERR_HAVE_NO_MEMORY(subndr);
+	subndr->flags		= ndr->flags;
+	subndr->current_mem_ctx	= ndr->current_mem_ctx;
+
+	subndr->data = ndr->data + ndr->offset;
+	subndr->offset = 0;
+	subndr->data_size = r_content_size;
+	subndr->iconv_convenience = talloc_reference(subndr, ndr->iconv_convenience);
+
+	if (force_le) {
+		ndr_set_flags(&ndr->flags, LIBNDR_FLAG_LITTLE_ENDIAN);
+	} else if (force_be) {
+		ndr_set_flags(&ndr->flags, LIBNDR_FLAG_BIGENDIAN);
+	}
+
+	*_subndr = subndr;
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ enum ndr_err_code ndr_pull_subcontext_end(struct ndr_pull *ndr,
+				 struct ndr_pull *subndr,
+				 size_t header_size,
+				 ssize_t size_is)
+{
+	uint32_t advance;
+	if (size_is >= 0) {
+		advance = size_is;
+	} else if (header_size > 0) {
+		advance = subndr->data_size;
+	} else {
+		advance = subndr->offset;
+	}
+	NDR_CHECK(ndr_pull_advance(ndr, advance));
+	return NDR_ERR_SUCCESS;
+}
+
+_PUBLIC_ enum ndr_err_code ndr_push_subcontext_start(struct ndr_push *ndr,
+				   struct ndr_push **_subndr,
+				   size_t header_size,
+				   ssize_t size_is)
+{
+	struct ndr_push *subndr;
+
+	subndr = ndr_push_init_ctx(ndr, ndr->iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(subndr);
+	subndr->flags	= ndr->flags;
+
+	*_subndr = subndr;
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  push a subcontext header 
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_subcontext_end(struct ndr_push *ndr,
+				 struct ndr_push *subndr,
+				 size_t header_size,
+				 ssize_t size_is)
+{
+	ssize_t padding_len;
+
+	if (size_is >= 0) {
+		padding_len = size_is - subndr->offset;
+		if (padding_len > 0) {
+			NDR_CHECK(ndr_push_zero(subndr, padding_len));
+		} else if (padding_len < 0) {
+			return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
+					      (int)subndr->offset, (int)size_is);
+		}
+	}
+
+	switch (header_size) {
+	case 0: 
+		break;
+
+	case 2: 
+		NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
+		break;
+
+	case 4: 
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
+		break;
+
+	case 0xFFFFFC01:
+		/*
+		 * Common Type Header for the Serialization Stream
+		 * See [MS-RPCE] 2.2.6 Type Serialization Version 1
+		 */
+		padding_len = NDR_ROUND(subndr->offset, 8) - subndr->offset;
+		if (padding_len > 0) {
+			NDR_CHECK(ndr_push_zero(subndr, padding_len));
+		}
+
+		/* version */
+		NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, 1));
+
+		/*
+		 * 0x10 little endian
+		 * 0x00 big endian
+		 */
+		NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, NDR_BE(ndr)?0x00:0x10));
+
+		/* length of the "Private Header for Constructed Type" */
+		NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 8));
+
+		/* filler */
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0xCCCCCCCC));
+
+		/*
+		 * Private Header for Constructed Type
+		 */
+		/* length - will be updated latter */
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
+
+		/* reserved */
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
+		break;
+
+	default:
+		return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d", 
+				      (int)header_size);
+	}
+
+	NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  store a token in the ndr context, for later retrieval
+*/
+_PUBLIC_ enum ndr_err_code ndr_token_store(TALLOC_CTX *mem_ctx,
+			 struct ndr_token_list **list, 
+			 const void *key, 
+			 uint32_t value)
+{
+	struct ndr_token_list *tok;
+	tok = talloc(mem_ctx, struct ndr_token_list);
+	NDR_ERR_HAVE_NO_MEMORY(tok);
+	tok->key = key;
+	tok->value = value;
+	DLIST_ADD((*list), tok);
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  retrieve a token from a ndr context, using cmp_fn to match the tokens
+*/
+_PUBLIC_ enum ndr_err_code ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
+				   comparison_fn_t _cmp_fn, bool _remove_tok)
+{
+	struct ndr_token_list *tok;
+	for (tok=*list;tok;tok=tok->next) {
+		if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
+		else if (!_cmp_fn && tok->key == key) goto found;
+	}
+	return NDR_ERR_TOKEN;
+found:
+	*v = tok->value;
+	if (_remove_tok) {
+		DLIST_REMOVE((*list), tok);
+		talloc_free(tok);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  retrieve a token from a ndr context
+*/
+_PUBLIC_ enum ndr_err_code ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
+{
+	return ndr_token_retrieve_cmp_fn(list, key, v, NULL, true);
+}
+
+/*
+  peek at but don't removed a token from a ndr context
+*/
+_PUBLIC_ uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
+{
+	enum ndr_err_code status;
+	uint32_t v;
+
+	status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, false);
+	if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
+		return 0;
+	}
+
+	return v;
+}
+
+/*
+  pull an array size field and add it to the array_size_list token list
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
+{
+	uint32_t size;
+	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &size));
+	return ndr_token_store(ndr, &ndr->array_size_list, p, size);
+}
+
+/*
+  get the stored array size field
+*/
+_PUBLIC_ uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
+{
+	return ndr_token_peek(&ndr->array_size_list, p);
+}
+
+/*
+  check the stored array size field
+*/
+_PUBLIC_ enum ndr_err_code ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
+{
+	uint32_t stored;
+	stored = ndr_token_peek(&ndr->array_size_list, p);
+	if (stored != size) {
+		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
+				      "Bad array size - got %u expected %u\n",
+				      stored, size);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  pull an array length field and add it to the array_length_list token list
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
+{
+	uint32_t length, offset;
+	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &offset));
+	if (offset != 0) {
+		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
+				      "non-zero array offset %u\n", offset);
+	}
+	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &length));
+	return ndr_token_store(ndr, &ndr->array_length_list, p, length);
+}
+
+/*
+  get the stored array length field
+*/
+_PUBLIC_ uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
+{
+	return ndr_token_peek(&ndr->array_length_list, p);
+}
+
+/*
+  check the stored array length field
+*/
+_PUBLIC_ enum ndr_err_code ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
+{
+	uint32_t stored;
+	stored = ndr_token_peek(&ndr->array_length_list, p);
+	if (stored != length) {
+		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
+				      "Bad array length - got %u expected %u\n",
+				      stored, length);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  store a switch value
+ */
+_PUBLIC_ enum ndr_err_code ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
+{
+	return ndr_token_store(ndr, &ndr->switch_list, p, val);
+}
+
+_PUBLIC_ enum ndr_err_code ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
+{
+	return ndr_token_store(ndr, &ndr->switch_list, p, val);
+}
+
+_PUBLIC_ enum ndr_err_code ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
+{
+	return ndr_token_store(ndr, &ndr->switch_list, p, val);
+}
+
+/*
+  retrieve a switch value
+ */
+_PUBLIC_ uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
+{
+	return ndr_token_peek(&ndr->switch_list, p);
+}
+
+_PUBLIC_ uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
+{
+	return ndr_token_peek(&ndr->switch_list, p);
+}
+
+_PUBLIC_ uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
+{
+	return ndr_token_peek(&ndr->switch_list, p);
+}
+
+/*
+  pull a struct from a blob using NDR
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
+			      ndr_pull_flags_fn_t fn)
+{
+	struct ndr_pull *ndr;
+	ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(ndr);
+	NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  pull a struct from a blob using NDR - failing if all bytes are not consumed
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, 
+						    struct smb_iconv_convenience *iconv_convenience,
+						    void *p, ndr_pull_flags_fn_t fn)
+{
+	struct ndr_pull *ndr;
+	ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(ndr);
+	NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
+	if (ndr->offset < ndr->data_size) {
+		return ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
+				      "not all bytes consumed ofs[%u] size[%u]",
+				      ndr->offset, ndr->data_size);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  pull a union from a blob using NDR, given the union discriminator
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, 
+					       struct smb_iconv_convenience *iconv_convenience, void *p,
+			     uint32_t level, ndr_pull_flags_fn_t fn)
+{
+	struct ndr_pull *ndr;
+	ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(ndr);
+	NDR_CHECK(ndr_pull_set_switch_value(ndr, p, level));
+	NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  pull a union from a blob using NDR, given the union discriminator,
+  failing if all bytes are not consumed
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_union_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, 
+						   struct smb_iconv_convenience *iconv_convenience, void *p,
+			     uint32_t level, ndr_pull_flags_fn_t fn)
+{
+	struct ndr_pull *ndr;
+	ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(ndr);
+	NDR_CHECK(ndr_pull_set_switch_value(ndr, p, level));
+	NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
+	if (ndr->offset < ndr->data_size) {
+		return ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
+				      "not all bytes consumed ofs[%u] size[%u]",
+				      ndr->offset, ndr->data_size);
+	}
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  push a struct to a blob using NDR
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, const void *p, ndr_push_flags_fn_t fn)
+{
+	struct ndr_push *ndr;
+	ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(ndr);
+
+	NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
+
+	*blob = ndr_push_blob(ndr);
+	talloc_steal(mem_ctx, blob->data);
+	talloc_free(ndr);
+
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  push a union to a blob using NDR
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
+			     uint32_t level, ndr_push_flags_fn_t fn)
+{
+	struct ndr_push *ndr;
+	ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
+	NDR_ERR_HAVE_NO_MEMORY(ndr);
+
+	NDR_CHECK(ndr_push_set_switch_value(ndr, p, level));
+	NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
+
+	*blob = ndr_push_blob(ndr);
+	talloc_steal(mem_ctx, blob->data);
+	talloc_free(ndr);
+
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  generic ndr_size_*() handler for structures
+*/
+_PUBLIC_ size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push)
+{
+	struct ndr_push *ndr;
+	enum ndr_err_code status;
+	size_t ret;
+
+	/* avoid recursion */
+	if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
+
+	ndr = ndr_push_init_ctx(NULL, lp_iconv_convenience(global_loadparm));
+	if (!ndr) return 0;
+	ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
+	status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
+	if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
+		talloc_free(ndr);
+		return 0;
+	}
+	ret = ndr->offset;
+	talloc_free(ndr);
+	return ret;
+}
+
+/*
+  generic ndr_size_*() handler for unions
+*/
+_PUBLIC_ size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push)
+{
+	struct ndr_push *ndr;
+	enum ndr_err_code status;
+	size_t ret;
+
+	/* avoid recursion */
+	if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
+
+	ndr = ndr_push_init_ctx(NULL, lp_iconv_convenience(global_loadparm));
+	if (!ndr) return 0;
+	ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
+
+	status = ndr_push_set_switch_value(ndr, p, level);
+	if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
+		talloc_free(ndr);
+		return 0;
+	}
+	status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
+	if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
+		talloc_free(ndr);
+		return 0;
+	}
+	ret = ndr->offset;
+	talloc_free(ndr);
+	return ret;
+}
+
+/*
+  get the current base for relative pointers for the push
+*/
+_PUBLIC_ uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
+{
+	return ndr->relative_base_offset;
+}
+
+/*
+  restore the old base for relative pointers for the push
+*/
+_PUBLIC_ void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
+{
+	ndr->relative_base_offset = offset;
+}
+
+/*
+  setup the current base for relative pointers for the push
+  called in the NDR_SCALAR stage
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
+{
+	ndr->relative_base_offset = offset;
+	return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
+}
+
+/*
+  setup the current base for relative pointers for the push
+  called in the NDR_BUFFERS stage
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
+{
+	return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
+}
+
+/*
+  push a relative object - stage1
+  this is called during SCALARS processing
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
+{
+	if (p == NULL) {
+		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
+		return NDR_ERR_SUCCESS;
+	}
+	NDR_CHECK(ndr_push_align(ndr, 4));
+	NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
+	return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
+}
+
+/*
+  push a relative object - stage2
+  this is called during buffers processing
+*/
+_PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
+{
+	uint32_t save_offset;
+	uint32_t ptr_offset = 0xFFFFFFFF;
+	if (p == NULL) {
+		return NDR_ERR_SUCCESS;
+	}
+	save_offset = ndr->offset;
+	NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
+	if (ptr_offset > ndr->offset) {
+		return ndr_push_error(ndr, NDR_ERR_BUFSIZE, 
+				      "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
+				      ptr_offset, ndr->offset);
+	}
+	ndr->offset = ptr_offset;
+	if (save_offset < ndr->relative_base_offset) {
+		return ndr_push_error(ndr, NDR_ERR_BUFSIZE, 
+				      "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
+				      save_offset, ndr->relative_base_offset);
+	}	
+	NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
+	ndr->offset = save_offset;
+	return NDR_ERR_SUCCESS;
+}
+
+/*
+  get the current base for relative pointers for the pull
+*/
+_PUBLIC_ uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
+{
+	return ndr->relative_base_offset;
+}
+
+/*
+  restore the old base for relative pointers for the pull
+*/
+_PUBLIC_ void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
+{
+	ndr->relative_base_offset = offset;
+}
+
+/*
+  setup the current base for relative pointers for the pull
+  called in the NDR_SCALAR stage
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
+{
+	ndr->relative_base_offset = offset;
+	return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
+}
+
+/*
+  setup the current base for relative pointers for the pull
+  called in the NDR_BUFFERS stage
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
+{
+	return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
+}
+
+/*
+  pull a relative object - stage1
+  called during SCALARS processing
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
+{
+	rel_offset += ndr->relative_base_offset;
+	if (rel_offset > ndr->data_size) {
+		return ndr_pull_error(ndr, NDR_ERR_BUFSIZE, 
+				      "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
+				      rel_offset, ndr->data_size);
+	}
+	return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
+}
+
+/*
+  pull a relative object - stage2
+  called during BUFFERS processing
+*/
+_PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
+{
+	uint32_t rel_offset;
+	NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
+	return ndr_pull_set_offset(ndr, rel_offset);
+}