2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 2003
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 this provides the core routines for NDR parsing functions
26 see http://www.opengroup.org/onlinepubs/9629399/chap14.htm for details
31 #include "dlinklist.h"
33 #define NDR_BASE_MARSHALL_SIZE 1024
36 work out the number of bytes needed to align on a n byte boundary
38 size_t ndr_align_size(uint32_t offset, size_t n)
40 if ((offset & (n-1)) == 0) return 0;
41 return n - (offset & (n-1));
45 initialise a ndr parse structure from a data blob
47 struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
51 ndr = talloc_zero(mem_ctx, struct ndr_pull);
52 if (!ndr) return NULL;
54 ndr->data = blob->data;
55 ndr->data_size = blob->length;
61 create an ndr sub-context based on an existing context. The new context starts
62 at the current offset, with the given size limit
64 NTSTATUS ndr_pull_subcontext(struct ndr_pull *ndr, struct ndr_pull *ndr2, uint32_t size)
66 NDR_PULL_NEED_BYTES(ndr, size);
68 ndr2->data += ndr2->offset;
70 ndr2->data_size = size;
71 ndr2->flags = ndr->flags;
77 advance by 'size' bytes
79 NTSTATUS ndr_pull_advance(struct ndr_pull *ndr, uint32_t size)
82 if (ndr->offset > ndr->data_size) {
83 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
84 "ndr_pull_advance by %u failed",
91 set the parse offset to 'ofs'
93 NTSTATUS ndr_pull_set_offset(struct ndr_pull *ndr, uint32_t ofs)
96 if (ndr->offset > ndr->data_size) {
97 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
98 "ndr_pull_set_offset %u failed",
104 /* save the offset/size of the current ndr state */
105 void ndr_pull_save(struct ndr_pull *ndr, struct ndr_pull_save *save)
107 save->offset = ndr->offset;
108 save->data_size = ndr->data_size;
111 /* restore the size/offset of a ndr structure */
112 void ndr_pull_restore(struct ndr_pull *ndr, struct ndr_pull_save *save)
114 ndr->offset = save->offset;
115 ndr->data_size = save->data_size;
119 /* create a ndr_push structure, ready for some marshalling */
120 struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx)
122 struct ndr_push *ndr;
124 ndr = talloc_zero(mem_ctx, struct ndr_push);
130 ndr->alloc_size = NDR_BASE_MARSHALL_SIZE;
131 ndr->data = talloc_array(ndr, uint8_t, ndr->alloc_size);
140 /* create a ndr_push structure, ready for some marshalling */
141 struct ndr_push *ndr_push_init(void)
143 return ndr_push_init_ctx(NULL);
146 /* free a ndr_push structure */
147 void ndr_push_free(struct ndr_push *ndr)
153 /* return a DATA_BLOB structure for the current ndr_push marshalled data */
154 DATA_BLOB ndr_push_blob(struct ndr_push *ndr)
157 blob.data = ndr->data;
158 blob.length = ndr->offset;
164 expand the available space in the buffer to 'size'
166 NTSTATUS ndr_push_expand(struct ndr_push *ndr, uint32_t size)
168 if (ndr->alloc_size >= size) {
172 ndr->alloc_size += NDR_BASE_MARSHALL_SIZE;
173 if (size > ndr->alloc_size) {
174 ndr->alloc_size = size;
176 ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->alloc_size);
178 return ndr_push_error(ndr, NDR_ERR_ALLOC, "Failed to push_expand to %u",
186 set the push offset to 'ofs'
188 NTSTATUS ndr_push_set_offset(struct ndr_push *ndr, uint32_t ofs)
190 NDR_CHECK(ndr_push_expand(ndr, ofs));
198 NTSTATUS ndr_push_array(struct ndr_push *ndr, int ndr_flags, void *base,
199 size_t elsize, uint32_t count,
200 NTSTATUS (*push_fn)(struct ndr_push *, int, void *))
204 if (!(ndr_flags & NDR_SCALARS)) goto buffers;
205 for (i=0;i<count;i++) {
206 NDR_CHECK(push_fn(ndr, NDR_SCALARS, p));
209 if (!(ndr_flags & NDR_BUFFERS)) goto done;
212 for (i=0;i<count;i++) {
213 NDR_CHECK(push_fn(ndr, NDR_BUFFERS, p));
221 pull a constant sized array
223 NTSTATUS ndr_pull_array(struct ndr_pull *ndr, int ndr_flags, void *base,
224 size_t elsize, uint32_t count,
225 NTSTATUS (*pull_fn)(struct ndr_pull *, int, void *))
230 if (!(ndr_flags & NDR_SCALARS)) goto buffers;
231 for (i=0;i<count;i++) {
232 NDR_CHECK(pull_fn(ndr, NDR_SCALARS, p));
235 if (!(ndr_flags & NDR_BUFFERS)) goto done;
238 for (i=0;i<count;i++) {
239 NDR_CHECK(pull_fn(ndr, NDR_BUFFERS, p));
247 pull a constant size array of structures
249 NTSTATUS ndr_pull_struct_array(struct ndr_pull *ndr, uint32_t count,
250 size_t elsize, void **info,
251 NTSTATUS (*pull_fn)(struct ndr_pull *, int, void *))
256 NDR_ALLOC_N_SIZE(ndr, *info, count, elsize);
257 base = (char *)*info;
259 for (i = 0; i < count; i++) {
260 ndr->data += ndr->offset;
262 NDR_CHECK(pull_fn(ndr, NDR_SCALARS|NDR_BUFFERS, &base[count * elsize]));
269 print a generic array
271 void ndr_print_array(struct ndr_print *ndr, const char *name, void *base,
272 size_t elsize, uint32_t count,
273 void (*print_fn)(struct ndr_print *, const char *, void *))
277 ndr->print(ndr, "%s: ARRAY(%d)", name, count);
279 for (i=0;i<count;i++) {
281 asprintf(&idx, "[%d]", i);
283 print_fn(ndr, idx, p);
293 void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...) _PRINTF_ATTRIBUTE(2,3)
299 va_start(ap, format);
300 vasprintf(&s, format, ap);
303 for (i=0;i<ndr->depth;i++) {
307 DEBUG(0,("%s\n", s));
312 a useful helper function for printing idl structures via DEBUG()
314 void ndr_print_debug(ndr_print_fn_t fn, const char *name, void *ptr)
316 struct ndr_print *ndr;
318 ndr = talloc(NULL, struct ndr_print);
320 ndr->print = ndr_print_debug_helper;
323 ndr->switch_list = talloc(ndr, struct ndr_token_list);
324 if (!ndr->switch_list)
332 a useful helper function for printing idl function calls via DEBUG()
334 void ndr_print_function_debug(ndr_print_function_t fn, const char *name, int flags, void *ptr)
336 struct ndr_print *ndr;
338 ndr = talloc(NULL, struct ndr_print);
340 ndr->print = ndr_print_debug_helper;
343 fn(ndr, name, flags, ptr);
347 void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
349 /* the big/little endian flags are inter-dependent */
350 if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
351 (*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
353 if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
354 (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
356 (*pflags) |= new_flags;
359 static NTSTATUS ndr_map_error(enum ndr_err_code err)
362 case NDR_ERR_BUFSIZE:
363 return NT_STATUS_BUFFER_TOO_SMALL;
365 return NT_STATUS_INTERNAL_ERROR;
367 return NT_STATUS_NO_MEMORY;
368 case NDR_ERR_ARRAY_SIZE:
369 return NT_STATUS_ARRAY_BOUNDS_EXCEEDED;
374 /* we should all error codes to different status codes */
375 return NT_STATUS_INVALID_PARAMETER;
379 return and possibly log an NDR error
381 NTSTATUS ndr_pull_error(struct ndr_pull *ndr,
382 enum ndr_err_code err, const char *format, ...) _PRINTF_ATTRIBUTE(3,4)
387 va_start(ap, format);
388 vasprintf(&s, format, ap);
391 DEBUG(3,("ndr_pull_error(%u): %s\n", err, s));
395 return ndr_map_error(err);
399 return and possibly log an NDR error
401 NTSTATUS ndr_push_error(struct ndr_push *ndr, enum ndr_err_code err, const char *format, ...) _PRINTF_ATTRIBUTE(3,4)
406 va_start(ap, format);
407 vasprintf(&s, format, ap);
410 DEBUG(3,("ndr_push_error(%u): %s\n", err, s));
414 return ndr_map_error(err);
419 handle subcontext buffers, which in midl land are user-marshalled, but
420 we use magic in pidl to make them easier to cope with
422 NTSTATUS ndr_pull_subcontext_header(struct ndr_pull *ndr,
425 struct ndr_pull *ndr2)
427 ndr2->flags = ndr->flags;
429 switch (header_size) {
431 uint32_t content_size = ndr->data_size - ndr->offset;
433 content_size = size_is;
435 NDR_CHECK(ndr_pull_subcontext(ndr, ndr2, content_size));
440 uint16_t content_size;
441 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
442 if (size_is >= 0 && size_is != content_size) {
443 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
444 size_is, content_size);
446 NDR_CHECK(ndr_pull_subcontext(ndr, ndr2, content_size));
451 uint32_t content_size;
452 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
453 if (size_is >= 0 && size_is != content_size) {
454 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
455 size_is, content_size);
457 NDR_CHECK(ndr_pull_subcontext(ndr, ndr2, content_size));
461 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d",
468 push a subcontext header
470 NTSTATUS ndr_push_subcontext_header(struct ndr_push *ndr,
473 struct ndr_push *ndr2)
476 ssize_t padding_len = size_is - ndr2->offset;
477 if (padding_len > 0) {
478 NDR_CHECK(ndr_push_zero(ndr2, padding_len));
479 } else if (padding_len < 0) {
480 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
481 ndr2->offset, size_is);
485 switch (header_size) {
490 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, ndr2->offset));
494 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, ndr2->offset));
498 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d",
505 mark the start of a structure
507 NTSTATUS ndr_pull_struct_start(struct ndr_pull *ndr)
513 mark the end of a structure
515 void ndr_pull_struct_end(struct ndr_pull *ndr)
520 mark the start of a structure
522 NTSTATUS ndr_push_struct_start(struct ndr_push *ndr)
528 mark the end of a structure
530 void ndr_push_struct_end(struct ndr_push *ndr)
535 store a token in the ndr context, for later retrieval
537 static NTSTATUS ndr_token_store(TALLOC_CTX *mem_ctx,
538 struct ndr_token_list **list,
542 struct ndr_token_list *tok;
543 tok = talloc(mem_ctx, struct ndr_token_list);
545 return NT_STATUS_NO_MEMORY;
549 DLIST_ADD((*list), tok);
554 retrieve a token from a ndr context
556 static NTSTATUS ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
558 struct ndr_token_list *tok;
559 for (tok=*list;tok;tok=tok->next) {
560 if (tok->key == key) {
561 DLIST_REMOVE((*list), tok);
566 return ndr_map_error(NDR_ERR_TOKEN);
570 peek at but don't removed a token from a ndr context
572 static uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
574 struct ndr_token_list *tok;
575 for (tok=*list;tok;tok=tok->next) {
576 if (tok->key == key) {
584 pull an array size field and add it to the array_size_list token list
586 NTSTATUS ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
589 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &size));
590 return ndr_token_store(ndr, &ndr->array_size_list, p, size);
594 get the stored array size field
596 uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
598 return ndr_token_peek(&ndr->array_size_list, p);
602 check the stored array size field
604 NTSTATUS ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
607 NDR_CHECK(ndr_token_retrieve(&ndr->array_size_list, p, &stored));
608 if (stored != size) {
609 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
610 "Bad array size - got %u expected %u\n",
617 pull an array length field and add it to the array_length_list token list
619 NTSTATUS ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
621 uint32_t length, offset;
622 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &offset));
624 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
625 "non-zero array offset %u\n", offset);
627 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &length));
628 return ndr_token_store(ndr, &ndr->array_length_list, p, length);
632 get the stored array length field
634 uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
636 return ndr_token_peek(&ndr->array_length_list, p);
640 check the stored array length field
642 NTSTATUS ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
645 NDR_CHECK(ndr_token_retrieve(&ndr->array_length_list, p, &stored));
646 if (stored != length) {
647 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
648 "Bad array length - got %u expected %u\n",
657 NTSTATUS ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
659 return ndr_token_store(ndr, &ndr->switch_list, p, val);
662 NTSTATUS ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
664 return ndr_token_store(ndr, &ndr->switch_list, p, val);
668 retrieve a switch value
670 uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
672 return ndr_token_peek(&ndr->switch_list, p);
675 uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
677 return ndr_token_peek(&ndr->switch_list, p);
680 NTSTATUS ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
682 return ndr_token_store(ndr, &ndr->switch_list, p, val);
686 retrieve a switch value
688 uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
690 return ndr_token_peek(&ndr->switch_list, p);
694 pull a relative object - stage1
695 called during SCALARS processing
697 NTSTATUS ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
699 if (ndr->flags & LIBNDR_FLAG_RELATIVE_CURRENT) {
700 return ndr_token_store(ndr, &ndr->relative_list, p,
701 rel_offset + ndr->offset - 4);
703 return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
708 pull a relative object - stage2
709 called during BUFFERS processing
711 NTSTATUS ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
714 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
715 return ndr_pull_set_offset(ndr, rel_offset);
719 push a relative object - stage1
720 this is called during SCALARS processing
722 NTSTATUS ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
725 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
728 NDR_CHECK(ndr_push_align(ndr, 4));
729 NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
730 return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
734 push a relative object - stage2
735 this is called during buffers processing
737 NTSTATUS ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
739 struct ndr_push_save save;
743 NDR_CHECK(ndr_push_align(ndr, 4));
744 ndr_push_save(ndr, &save);
745 NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ndr->offset));
746 if (ndr->flags & LIBNDR_FLAG_RELATIVE_CURRENT) {
747 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save.offset - ndr->offset));
749 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save.offset));
751 ndr_push_restore(ndr, &save);
756 pull a struct from a blob using NDR
758 NTSTATUS ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
759 ndr_pull_flags_fn_t fn)
761 struct ndr_pull *ndr;
762 ndr = ndr_pull_init_blob(blob, mem_ctx);
764 return NT_STATUS_NO_MEMORY;
766 return fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
770 push a struct to a blob using NDR
772 NTSTATUS ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
773 ndr_push_flags_fn_t fn)
776 struct ndr_push *ndr;
777 ndr = ndr_push_init_ctx(mem_ctx);
779 return NT_STATUS_NO_MEMORY;
781 status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
782 if (!NT_STATUS_IS_OK(status)) {
786 *blob = ndr_push_blob(ndr);
792 generic ndr_size_*() handler for structures
794 size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push)
796 struct ndr_push *ndr;
800 /* avoid recursion */
801 if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
803 ndr = ndr_push_init_ctx(NULL);
805 ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
806 status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
807 if (!NT_STATUS_IS_OK(status)) {
816 generic ndr_size_*() handler for unions
818 size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push)
820 struct ndr_push *ndr;
824 /* avoid recursion */
825 if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
827 ndr = ndr_push_init_ctx(NULL);
829 ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
830 ndr_push_set_switch_value(ndr, p, level);
831 status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
832 if (!NT_STATUS_IS_OK(status)) {