diff options
Diffstat (limited to 'source3/librpc/ndr/ndr.c')
| -rw-r--r-- | source3/librpc/ndr/ndr.c | 961 |
1 files changed, 961 insertions, 0 deletions
diff --git a/source3/librpc/ndr/ndr.c b/source3/librpc/ndr/ndr.c new file mode 100644 index 0000000000..2aff7a88f0 --- /dev/null +++ b/source3/librpc/ndr/ndr.c @@ -0,0 +1,961 @@ +/* + 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 2 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, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +/* + 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" + +#define NDR_BASE_MARSHALL_SIZE 1024 + +/* this guid indicates NDR encoding in a protocol tower */ +const struct dcerpc_syntax_id ndr_transfer_syntax = { + { 0x8a885d04, 0x1ceb, 0x11c9, {0x9f, 0xe8}, {0x08,0x00,0x2b,0x10,0x48,0x60} }, + 2 +}; + +const struct dcerpc_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 +*/ +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 +*/ +struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx) +{ + 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; + + return ndr; +} + +/* + advance by 'size' bytes +*/ +NTSTATUS 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 NT_STATUS_OK; +} + +/* + set the parse offset to 'ofs' +*/ +static NTSTATUS 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 NT_STATUS_OK; +} + +/* save the offset/size of the current ndr state */ +void ndr_pull_save(struct ndr_pull *ndr, struct ndr_pull_save *save) +{ + save->offset = ndr->offset; + save->data_size = ndr->data_size; +} + +/* restore the size/offset of a ndr structure */ +void ndr_pull_restore(struct ndr_pull *ndr, struct ndr_pull_save *save) +{ + ndr->offset = save->offset; + ndr->data_size = save->data_size; +} + + +/* create a ndr_push structure, ready for some marshalling */ +struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx) +{ + 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; + } + + return ndr; +} + + +/* create a ndr_push structure, ready for some marshalling */ +struct ndr_push *ndr_push_init(void) +{ + return ndr_push_init_ctx(NULL); +} + +/* free a ndr_push structure */ +void ndr_push_free(struct ndr_push *ndr) +{ + talloc_free(ndr); +} + + +/* return a DATA_BLOB structure for the current ndr_push marshalled data */ +DATA_BLOB ndr_push_blob(struct ndr_push *ndr) +{ + DATA_BLOB blob; + blob.data = ndr->data; + blob.length = ndr->offset; + blob.free = NULL; + if (ndr->alloc_size > ndr->offset) { + ndr->data[ndr->offset] = 0; + } + return blob; +} + + +/* + expand the available space in the buffer to 'size' +*/ +NTSTATUS ndr_push_expand(struct ndr_push *ndr, uint32_t size) +{ + if (ndr->alloc_size > size) { + return NT_STATUS_OK; + } + + 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 NT_STATUS_OK; +} + +void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...) _PRINTF_ATTRIBUTE(2,3) +{ + va_list ap; + char *s = NULL; + int i; + + va_start(ap, format); + vasprintf(&s, format, ap); + va_end(ap); + + for (i=0;i<ndr->depth;i++) { + DEBUG(0,(" ")); + } + + DEBUG(0,("%s\n", s)); + free(s); +} + +static void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...) _PRINTF_ATTRIBUTE(2,3) +{ + va_list ap; + int i; + + for (i=0;i<ndr->depth;i++) { + ndr->private_data = talloc_asprintf_append(ndr->private_data, " "); + } + + va_start(ap, format); + ndr->private_data = talloc_vasprintf_append(ndr->private_data, format, ap); + va_end(ap); + ndr->private_data = talloc_asprintf_append(ndr->private_data, "\n"); +} + +/* + a useful helper function for printing idl structures via DEBUG() +*/ +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() +*/ +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() +*/ +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 function calls to a string +*/ +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; + if (!(ndr->private_data = talloc_strdup(mem_ctx, ""))) { + TALLOC_FREE(ndr); + return NULL; + } + ndr->print = ndr_print_string_helper; + ndr->depth = 1; + ndr->flags = 0; + fn(ndr, name, flags, ptr); + ret = ndr->private_data; + talloc_free(ndr); + return ret; +} + +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; +} + +static NTSTATUS ndr_map_error(enum ndr_err_code ndr_err) +{ + switch (ndr_err) { + case NDR_ERR_BUFSIZE: + return NT_STATUS_BUFFER_TOO_SMALL; + case NDR_ERR_TOKEN: + return NT_STATUS_INTERNAL_ERROR; + case NDR_ERR_ALLOC: + return NT_STATUS_NO_MEMORY; + case NDR_ERR_ARRAY_SIZE: + return NT_STATUS_ARRAY_BOUNDS_EXCEEDED; + default: + break; + } + + /* we should map all error codes to different status codes */ + return NT_STATUS_INVALID_PARAMETER; +} + +/* + return and possibly log an NDR error +*/ +NTSTATUS ndr_pull_error(struct ndr_pull *ndr, + enum ndr_err_code ndr_err, + const char *format, ...) _PRINTF_ATTRIBUTE(3,4) +{ + char *s=NULL; + va_list ap; + + va_start(ap, format); + vasprintf(&s, format, ap); + va_end(ap); + + DEBUG(3,("ndr_pull_error(%u): %s\n", ndr_err, s)); + + free(s); + + return ndr_map_error(ndr_err); +} + +/* + return and possibly log an NDR error +*/ +NTSTATUS ndr_push_error(struct ndr_push *ndr, + enum ndr_err_code ndr_err, + const char *format, ...) _PRINTF_ATTRIBUTE(3,4) +{ + char *s=NULL; + va_list ap; + + va_start(ap, format); + vasprintf(&s, format, ap); + va_end(ap); + + DEBUG(3,("ndr_push_error(%u): %s\n", ndr_err, s)); + + free(s); + + return ndr_map_error(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 +*/ +NTSTATUS 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; + + 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; + } + 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); + NT_STATUS_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 = subndr; + return NT_STATUS_OK; +} + +NTSTATUS 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 NT_STATUS_OK; +} + +NTSTATUS 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); + NT_STATUS_HAVE_NO_MEMORY(subndr); + subndr->flags = ndr->flags; + + *_subndr = subndr; + return NT_STATUS_OK; +} + +/* + push a subcontext header +*/ +NTSTATUS ndr_push_subcontext_end(struct ndr_push *ndr, + struct ndr_push *subndr, + size_t header_size, + ssize_t size_is) +{ + if (size_is >= 0) { + ssize_t 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; + + 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 NT_STATUS_OK; +} + +/* + store a token in the ndr context, for later retrieval +*/ +NTSTATUS 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); + if (tok == NULL) { + return NT_STATUS_NO_MEMORY; + } + tok->key = key; + tok->value = value; + DLIST_ADD((*list), tok); + return NT_STATUS_OK; +} + +/* + retrieve a token from a ndr context, using cmp_fn to match the tokens +*/ +NTSTATUS 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_map_error(NDR_ERR_TOKEN); +found: + *v = tok->value; + if (_remove_tok) { + DLIST_REMOVE((*list), tok); + talloc_free(tok); + } + return NT_STATUS_OK; +} + +/* + retrieve a token from a ndr context +*/ +NTSTATUS 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 +*/ +uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key) +{ + NTSTATUS status; + uint32_t v; + status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, False); + if (NT_STATUS_IS_OK(status)) return v; + return 0; +} + +/* + pull an array size field and add it to the array_size_list token list +*/ +NTSTATUS 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 +*/ +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 +*/ +NTSTATUS 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 NT_STATUS_OK; +} + +/* + pull an array length field and add it to the array_length_list token list +*/ +NTSTATUS 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 +*/ +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 +*/ +NTSTATUS 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 NT_STATUS_OK; +} + +/* + store a switch value + */ +NTSTATUS 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); +} + +NTSTATUS 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); +} + +NTSTATUS 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 + */ +uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p) +{ + return ndr_token_peek(&ndr->switch_list, p); +} + +uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p) +{ + return ndr_token_peek(&ndr->switch_list, p); +} + +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 +*/ +NTSTATUS ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p, + ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + ndr = ndr_pull_init_blob(blob, mem_ctx); + if (!ndr) { + return NT_STATUS_NO_MEMORY; + } + return fn(ndr, NDR_SCALARS|NDR_BUFFERS, p); +} + +/* + pull a struct from a blob using NDR - failing if all bytes are not consumed +*/ +NTSTATUS ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p, + ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + NTSTATUS status; + + ndr = ndr_pull_init_blob(blob, mem_ctx); + if (!ndr) { + return NT_STATUS_NO_MEMORY; + } + status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p); + if (!NT_STATUS_IS_OK(status)) return status; + if (ndr->offset != ndr->data_size) { + return NT_STATUS_BUFFER_TOO_SMALL; + } + return status; +} + +/* + pull a union from a blob using NDR, given the union discriminator +*/ +NTSTATUS ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p, + uint32_t level, ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + NTSTATUS status; + + ndr = ndr_pull_init_blob(blob, mem_ctx); + if (!ndr) { + return NT_STATUS_NO_MEMORY; + } + ndr_pull_set_switch_value(ndr, p, level); + status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p); + if (!NT_STATUS_IS_OK(status)) return status; + if (ndr->offset != ndr->data_size) { + return NT_STATUS_BUFFER_TOO_SMALL; + } + return status; +} + +/* + push a struct to a blob using NDR +*/ +NTSTATUS ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, const void *p, + ndr_push_flags_fn_t fn) +{ + NTSTATUS status; + struct ndr_push *ndr; + ndr = ndr_push_init_ctx(mem_ctx); + if (!ndr) { + return NT_STATUS_NO_MEMORY; + } + status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + *blob = ndr_push_blob(ndr); + + return NT_STATUS_OK; +} + +/* + push a union to a blob using NDR +*/ +NTSTATUS ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p, + uint32_t level, ndr_push_flags_fn_t fn) +{ + NTSTATUS status; + struct ndr_push *ndr; + ndr = ndr_push_init_ctx(mem_ctx); + if (!ndr) { + return NT_STATUS_NO_MEMORY; + } + ndr_push_set_switch_value(ndr, p, level); + status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + *blob = ndr_push_blob(ndr); + + return NT_STATUS_OK; +} + +/* + generic ndr_size_*() handler for structures +*/ +size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push) +{ + struct ndr_push *ndr; + NTSTATUS status; + size_t ret; + + /* avoid recursion */ + if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0; + + ndr = ndr_push_init_ctx(NULL); + if (!ndr) return 0; + ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE; + status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p); + if (!NT_STATUS_IS_OK(status)) { + return 0; + } + ret = ndr->offset; + talloc_free(ndr); + return ret; +} + +/* + generic ndr_size_*() handler for unions +*/ +size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push) +{ + struct ndr_push *ndr; + NTSTATUS status; + size_t ret; + + /* avoid recursion */ + if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0; + + ndr = ndr_push_init_ctx(NULL); + if (!ndr) return 0; + ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE; + ndr_push_set_switch_value(ndr, p, level); + status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p); + if (!NT_STATUS_IS_OK(status)) { + return 0; + } + ret = ndr->offset; + talloc_free(ndr); + return ret; +} + +/* + get the current base for relative pointers for the push +*/ +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 +*/ +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 +*/ +NTSTATUS 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 +*/ +NTSTATUS 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 +*/ +NTSTATUS ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p) +{ + if (p == NULL) { + NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0)); + return NT_STATUS_OK; + } + 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 +*/ +NTSTATUS ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p) +{ + struct ndr_push_save save; + uint32_t ptr_offset = 0xFFFFFFFF; + if (p == NULL) { + return NT_STATUS_OK; + } + ndr_push_save(ndr, &save); + 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_push_restore(ndr, &save); + return NT_STATUS_OK; +} + +/* + get the current base for relative pointers for the pull +*/ +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 +*/ +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 +*/ +NTSTATUS 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 +*/ +NTSTATUS 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 +*/ +NTSTATUS 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 +*/ +NTSTATUS 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); +} |