diff options
Diffstat (limited to 'librpc/ndr/ndr.c')
| -rw-r--r-- | librpc/ndr/ndr.c | 2005 |
1 files changed, 2005 insertions, 0 deletions
diff --git a/librpc/ndr/ndr.c b/librpc/ndr/ndr.c new file mode 100644 index 0000000..2576588 --- /dev/null +++ b/librpc/ndr/ndr.c @@ -0,0 +1,2005 @@ +/* + Unix SMB/CIFS implementation. + + libndr interface + + Copyright (C) Andrew Tridgell 2003 + Copyright (C) Jelmer Vernooij 2005-2008 + + 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 "librpc/ndr/ndr_private.h" +#include "../lib/util/dlinklist.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_RPC_PARSE + +#define NDR_BASE_MARSHALL_SIZE 1024 + +/* + * This value is arbitrary, but designed to reduce the memory a client + * can allocate and the work the client can force in processing a + * malicious packet. + * + * In an ideal world this would be controlled by range() restrictions + * on array sizes and careful IDL construction to avoid arbitary + * linked lists, but this is a backstop for now. + */ +#define NDR_TOKEN_MAX_LIST_SIZE 65535 + +size_t ndr_token_max_list_size(void) { + return NDR_TOKEN_MAX_LIST_SIZE; +}; + +/* this guid indicates NDR encoding in a protocol tower */ +const struct ndr_syntax_id ndr_transfer_syntax_ndr = { + { 0x8a885d04, 0x1ceb, 0x11c9, {0x9f, 0xe8}, {0x08,0x00,0x2b,0x10,0x48,0x60} }, + 2 +}; + +const struct ndr_syntax_id ndr_transfer_syntax_ndr64 = { + { 0x71710533, 0xbeba, 0x4937, {0x83, 0x19}, {0xb5,0xdb,0xef,0x9c,0xcc,0x36} }, + 1 +}; + +const struct ndr_syntax_id ndr_syntax_id_null = { + { 0, 0, 0, { 0, 0 }, { 0, 0, 0, 0, 0, 0 } }, + 0 +}; + +/* + 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 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; +} + +_PUBLIC_ enum ndr_err_code ndr_pull_append(struct ndr_pull *ndr, DATA_BLOB *blob) +{ + enum ndr_err_code ndr_err; + DATA_BLOB b; + uint32_t append = 0; + bool ok; + + if (blob->length == 0) { + return NDR_ERR_SUCCESS; + } + + ndr_err = ndr_token_retrieve(&ndr->array_size_list, ndr, &append); + if (ndr_err == NDR_ERR_TOKEN) { + append = 0; + ndr_err = NDR_ERR_SUCCESS; + } + NDR_CHECK(ndr_err); + + if (ndr->data_size == 0) { + ndr->data = NULL; + append = UINT32_MAX; + } + + if (append == UINT32_MAX) { + /* + * append == UINT32_MAX means that + * ndr->data is either NULL or a valid + * talloc child of ndr, which means + * we can use data_blob_append() without + * data_blob_talloc() of the existing callers data + */ + b = data_blob_const(ndr->data, ndr->data_size); + } else { + b = data_blob_talloc(ndr, ndr->data, ndr->data_size); + if (b.data == NULL) { + return ndr_pull_error(ndr, NDR_ERR_ALLOC, "%s", __location__); + } + } + + ok = data_blob_append(ndr, &b, blob->data, blob->length); + if (!ok) { + return ndr_pull_error(ndr, NDR_ERR_ALLOC, "%s", __location__); + } + + ndr->data = b.data; + ndr->data_size = b.length; + + return ndr_token_store(ndr, &ndr->array_size_list, ndr, UINT32_MAX); +} + +_PUBLIC_ enum ndr_err_code ndr_pull_pop(struct ndr_pull *ndr) +{ + uint32_t skip = 0; + uint32_t append = 0; + enum ndr_err_code ndr_err; + + if (ndr->relative_base_offset != 0) { + return ndr_pull_error(ndr, NDR_ERR_RELATIVE, + "%s", __location__); + } + if (ndr->relative_highest_offset != 0) { + return ndr_pull_error(ndr, NDR_ERR_RELATIVE, + "%s", __location__); + } + if (ndr->relative_list.count != 0) { + return ndr_pull_error(ndr, NDR_ERR_RELATIVE, + "%s", __location__); + } + if (ndr->relative_base_list.count != 0) { + return ndr_pull_error(ndr, NDR_ERR_RELATIVE, + "%s", __location__); + } + + /* + * we need to keep up to 7 bytes + * in order to get the aligment right. + */ + skip = ndr->offset & 0xFFFFFFF8; + + if (skip == 0) { + return NDR_ERR_SUCCESS; + } + + ndr->offset -= skip; + ndr->data_size -= skip; + + ndr_err = ndr_token_peek(&ndr->array_size_list, ndr, &append); + if (ndr_err == NDR_ERR_TOKEN) { + /* + * here we assume, that ndr->data is not a + * talloc child of ndr. + */ + ndr->data += skip; + return NDR_ERR_SUCCESS; + } + + memmove(ndr->data, ndr->data + skip, ndr->data_size); + + ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->data_size); + if (ndr->data_size != 0 && ndr->data == NULL) { + return ndr_pull_error(ndr, NDR_ERR_ALLOC, "%s", __location__); + } + + return NDR_ERR_SUCCESS; +} + +/* + advance by 'size' bytes +*/ +_PUBLIC_ enum ndr_err_code ndr_pull_advance(struct ndr_pull *ndr, uint32_t size) +{ + NDR_PULL_NEED_BYTES(ndr, size); + ndr->offset += 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 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) { + talloc_free(ndr); + return NULL; + } + + 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->fixed_buf_size) { + if (ndr->alloc_size >= size) { + return NDR_ERR_SUCCESS; + } + return ndr_push_error(ndr, + NDR_ERR_BUFSIZE, + "Overflow of fixed buffer 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_debugc_helper(struct ndr_print *ndr, const char *format, ...) +{ + va_list ap; + char *s = NULL; + uint32_t i; + int ret; + int dbgc_class; + + va_start(ap, format); + ret = vasprintf(&s, format, ap); + va_end(ap); + + if (ret == -1) { + return; + } + + dbgc_class = *(int *)ndr->private_data; + + if (ndr->no_newline) { + DEBUGADDC(dbgc_class, 1,("%s", s)); + free(s); + return; + } + + for (i=0;i<ndr->depth;i++) { + DEBUGADDC(dbgc_class, 1,(" ")); + } + + DEBUGADDC(dbgc_class, 1,("%s\n", s)); + free(s); +} + +_PUBLIC_ void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...) +{ + va_list ap; + char *s = NULL; + uint32_t i; + int ret; + + va_start(ap, format); + ret = vasprintf(&s, format, ap); + va_end(ap); + + if (ret == -1) { + return; + } + + if (ndr->no_newline) { + DEBUGADD(1,("%s", s)); + free(s); + return; + } + + for (i=0;i<ndr->depth;i++) { + DEBUGADD(1,(" ")); + } + + DEBUGADD(1,("%s\n", s)); + free(s); +} + +_PUBLIC_ void ndr_print_printf_helper(struct ndr_print *ndr, const char *format, ...) +{ + va_list ap; + uint32_t i; + + if (!ndr->no_newline) { + for (i=0;i<ndr->depth;i++) { + printf(" "); + } + } + + va_start(ap, format); + vprintf(format, ap); + va_end(ap); + if (!ndr->no_newline) { + printf("\n"); + } +} + +_PUBLIC_ void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...) +{ + va_list ap; + uint32_t i; + + if (!ndr->no_newline) { + 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); + if (!ndr->no_newline) { + ndr->private_data = talloc_asprintf_append_buffer((char *)ndr->private_data, + "\n"); + } +} + +/* + a useful helper function for printing idl structures via DEBUGC() +*/ +_PUBLIC_ void ndr_print_debugc(int dbgc_class, ndr_print_fn_t fn, const char *name, void *ptr) +{ + struct ndr_print *ndr; + + DEBUGC(dbgc_class, 1,(" ")); + + ndr = talloc_zero(NULL, struct ndr_print); + if (!ndr) return; + ndr->private_data = &dbgc_class; + ndr->print = ndr_print_debugc_helper; + ndr->depth = 1; + ndr->flags = 0; +#ifdef DEBUG_PASSWORD + if (CHECK_DEBUGLVL(100)) { + ndr->print_secrets = true; + } +#endif + + fn(ndr, name, ptr); + talloc_free(ndr); +} + +/* + a useful helper function for printing idl structures via DEBUG() +*/ +_PUBLIC_ bool ndr_print_debug(int level, + ndr_print_fn_t fn, + const char *name, + void *ptr, + const char *location, + const char *function) +{ + struct ndr_print *ndr; + + DEBUGLF(level, (" "), location, function); + + ndr = talloc_zero(NULL, struct ndr_print); + if (!ndr) return false; + ndr->print = ndr_print_debug_helper; + ndr->depth = 1; + ndr->flags = 0; +#ifdef DEBUG_PASSWORD + if (CHECK_DEBUGLVL(100)) { + ndr->print_secrets = true; + } +#endif + + fn(ndr, name, ptr); + talloc_free(ndr); + return true; +} + +/* + 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; + + DEBUG(1,(" ")); + + ndr = talloc_zero(NULL, struct ndr_print); + if (!ndr) return; + ndr->print = ndr_print_debug_helper; + ndr->depth = 1; + ndr->flags = 0; +#ifdef DEBUG_PASSWORD + if (CHECK_DEBUGLVL(100)) { + ndr->print_secrets = true; + } +#endif + + 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; + + DEBUG(1,(" ")); + + ndr = talloc_zero(NULL, struct ndr_print); + if (!ndr) return; + ndr->print = ndr_print_debug_helper; + ndr->depth = 1; + ndr->flags = 0; +#ifdef DEBUG_PASSWORD + if (CHECK_DEBUGLVL(100)) { + ndr->print_secrets = true; + } +#endif + + 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; + (*pflags) &= ~LIBNDR_FLAG_NDR64; + } + if (new_flags & LIBNDR_FLAG_BIGENDIAN) { + (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN; + (*pflags) &= ~LIBNDR_FLAG_NDR64; + } + if (new_flags & LIBNDR_ALIGN_FLAGS) { + /* Ensure we only have the passed-in + align flag set in the new_flags, + remove any old align flag. */ + (*pflags) &= ~LIBNDR_ALIGN_FLAGS; + } + if (new_flags & LIBNDR_FLAG_NO_RELATIVE_REVERSE) { + (*pflags) &= ~LIBNDR_FLAG_RELATIVE_REVERSE; + } + (*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 *function, + const char *location, + const char *format, ...) +{ + char *s=NULL; + va_list ap; + int ret; + + if (ndr->flags & LIBNDR_FLAG_INCOMPLETE_BUFFER) { + switch (ndr_err) { + case NDR_ERR_BUFSIZE: + return NDR_ERR_INCOMPLETE_BUFFER; + default: + break; + } + } + + va_start(ap, format); + ret = vasprintf(&s, format, ap); + va_end(ap); + + if (ret == -1) { + return NDR_ERR_ALLOC; + } + + D_WARNING("%s: ndr_pull_error(%s): %s at %s\n", + function, + ndr_map_error2string(ndr_err), + s, + location); + + 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 *function, + const char *location, + 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; + } + + D_WARNING("%s: ndr_push_error(%s): %s at %s\n", + function, + ndr_map_error2string(ndr_err), + s, + location); + + 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) (0x%04x) mismatch content_size %d (0x%04x)", + (int)size_is, (int)size_is, + (int)content_size, + (int)content_size); + } + r_content_size = content_size; + break; + } + + case 4: { + uint32_t content_size; + NDR_CHECK(ndr_pull_uint3264(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) (0x%08x) mismatch content_size %d (0x%08x)", + (int)size_is, (int)size_is, + (int)content_size, + (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; + } + case 0xFFFFFFFF: + /* + * a shallow copy like subcontext + * useful for DCERPC pipe chunks. + */ + 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; + subndr->offset = ndr->offset; + subndr->data_size = ndr->data_size; + + *_subndr = subndr; + return NDR_ERR_SUCCESS; + + 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 & ~LIBNDR_FLAG_NDR64; + subndr->current_mem_ctx = ndr->current_mem_ctx; + + subndr->data = ndr->data + ndr->offset; + subndr->offset = 0; + subndr->data_size = r_content_size; + + 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; + uint32_t highest_ofs; + + if (header_size == 0xFFFFFFFF) { + advance = subndr->offset - ndr->offset; + } else if (size_is >= 0) { + advance = size_is; + } else if (header_size > 0) { + advance = subndr->data_size; + } else { + advance = subndr->offset; + } + + if (subndr->offset > ndr->relative_highest_offset) { + highest_ofs = subndr->offset; + } else { + highest_ofs = subndr->relative_highest_offset; + } + if (!(subndr->flags & LIBNDR_FLAG_SUBCONTEXT_NO_UNREAD_BYTES)) { + /* + * avoid an error unless SUBCONTEXT_NO_UNREAD_BYTES is specified + */ + highest_ofs = advance; + } + if (highest_ofs < advance) { + return ndr_pull_error(subndr, NDR_ERR_UNREAD_BYTES, + "not all bytes consumed ofs[%u] advance[%u]", + highest_ofs, advance); + } + + 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_ERR_HAVE_NO_MEMORY(subndr); + subndr->flags = ndr->flags & ~LIBNDR_FLAG_NDR64; + + if (size_is > 0) { + NDR_CHECK(ndr_push_zero(subndr, size_is)); + subndr->offset = 0; + subndr->relative_end_offset = size_is; + } + + *_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) { + 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); + } + subndr->offset = 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_uint3264(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; +} + + +struct ndr_token { + const void *key; + uint32_t value; +}; + +/* + 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) +{ + if (list->tokens == NULL) { + list->tokens = talloc_array(mem_ctx, struct ndr_token, 10); + if (list->tokens == NULL) { + NDR_ERR_HAVE_NO_MEMORY(list->tokens); + } + } else { + struct ndr_token *new_tokens = NULL; + uint32_t alloc_count = talloc_array_length(list->tokens); + + /* + * Check every time we have not allocated too many + * tokens. This ensures developer sanity when + * debugging the boundary condition + */ + if (list->count >= NDR_TOKEN_MAX_LIST_SIZE) { + return NDR_ERR_RANGE; + } + if (list->count == alloc_count) { + unsigned new_alloc; + /* + * Double the list, until we start in chunks + * of 1000 + */ + unsigned increment = MIN(list->count, 1000); + new_alloc = alloc_count + increment; + if (new_alloc < alloc_count) { + return NDR_ERR_RANGE; + } + new_tokens = talloc_realloc(mem_ctx, list->tokens, + struct ndr_token, new_alloc); + NDR_ERR_HAVE_NO_MEMORY(new_tokens); + list->tokens = new_tokens; + } + } + list->tokens[list->count].key = key; + list->tokens[list->count].value = value; + list->count++; + 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 erase) +{ + struct ndr_token *tokens = list->tokens; + unsigned i; + if (_cmp_fn) { + for (i = list->count - 1; i < list->count; i--) { + if (_cmp_fn(tokens[i].key, key) == 0) { + goto found; + } + } + } else { + for (i = list->count - 1; i < list->count; i--) { + if (tokens[i].key == key) { + goto found; + } + } + } + return NDR_ERR_TOKEN; +found: + *v = tokens[i].value; + if (erase) { + if (i != list->count - 1) { + tokens[i] = tokens[list->count - 1]; + } + list->count--; + } + 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_ enum ndr_err_code ndr_token_peek(struct ndr_token_list *list, + const void *key, uint32_t *v) +{ + return ndr_token_retrieve_cmp_fn(list, key, v, NULL, false); +} + +/* + 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) +{ + enum ndr_err_code ret; + uint32_t size; + NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &size)); + ret = ndr_token_store(ndr, &ndr->array_size_list, p, size); + if (ret == NDR_ERR_RANGE) { + return ndr_pull_error(ndr, ret, + "More than %d NDR tokens stored for array_size", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +/* + get the stored array size field +*/ +_PUBLIC_ enum ndr_err_code ndr_get_array_size(struct ndr_pull *ndr, const void *p, uint32_t *size) +{ + return ndr_token_peek(&ndr->array_size_list, p, size); +} + +/* + get and remove from the stored list the stored array size field +*/ +_PUBLIC_ enum ndr_err_code ndr_steal_array_size(struct ndr_pull *ndr, const void *p, uint32_t *size) +{ + return ndr_token_retrieve(&ndr->array_size_list, p, size); +} + +/* + * check the stored array size field and remove from the stored list + * (the array_size NDR token list). We try to remove when possible to + * avoid the list growing towards the bounds check + */ +_PUBLIC_ enum ndr_err_code ndr_check_steal_array_size(struct ndr_pull *ndr, const void *p, uint32_t size) +{ + uint32_t stored; + NDR_CHECK(ndr_steal_array_size(ndr, p, &stored)); + 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; +} + +/* + * check the stored array size field (leaving it on the array_size + * token list) + */ +_PUBLIC_ enum ndr_err_code ndr_check_array_size(struct ndr_pull *ndr, const void *p, uint32_t size) +{ + uint32_t stored; + NDR_CHECK(ndr_get_array_size(ndr, p, &stored)); + 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) +{ + enum ndr_err_code ret; + uint32_t length, offset; + NDR_CHECK(ndr_pull_uint3264(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_uint3264(ndr, NDR_SCALARS, &length)); + ret = ndr_token_store(ndr, &ndr->array_length_list, p, length); + if (ret == NDR_ERR_RANGE) { + return ndr_pull_error(ndr, ret, + "More than %d NDR tokens stored for array_length_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +/* + get the stored array length field +*/ +_PUBLIC_ enum ndr_err_code ndr_get_array_length(struct ndr_pull *ndr, const void *p, uint32_t *length) +{ + return ndr_token_peek(&ndr->array_length_list, p, length); +} + +/* + * check the stored array length field and remove from the stored list + * (the array_size NDR token list). We try to remove when possible to + * avoid the list growing towards the bounds check + */ +_PUBLIC_ enum ndr_err_code ndr_steal_array_length(struct ndr_pull *ndr, const void *p, uint32_t *length) +{ + return ndr_token_retrieve(&ndr->array_length_list, p, length); +} +/* + check the stored array length field, removing it from the list +*/ +_PUBLIC_ enum ndr_err_code ndr_check_steal_array_length(struct ndr_pull *ndr, const void *p, uint32_t length) +{ + uint32_t stored; + NDR_CHECK(ndr_steal_array_length(ndr, p, &stored)); + 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; +} + +_PUBLIC_ enum ndr_err_code ndr_push_pipe_chunk_trailer(struct ndr_push *ndr, int ndr_flags, uint32_t count) +{ + if (ndr->flags & LIBNDR_FLAG_NDR64) { + int64_t tmp = 0 - (int64_t)count; + uint64_t ncount = tmp; + + NDR_CHECK(ndr_push_hyper(ndr, ndr_flags, ncount)); + } + + return NDR_ERR_SUCCESS; +} + +_PUBLIC_ enum ndr_err_code ndr_check_pipe_chunk_trailer(struct ndr_pull *ndr, int ndr_flags, uint32_t count) +{ + if (ndr->flags & LIBNDR_FLAG_NDR64) { + int64_t tmp = 0 - (int64_t)count; + uint64_t ncount1 = tmp; + uint64_t ncount2; + + NDR_CHECK(ndr_pull_hyper(ndr, ndr_flags, &ncount2)); + if (ncount1 == ncount2) { + return NDR_ERR_SUCCESS; + } + + return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, + "Bad pipe trailer[%lld should be %lld] size was %lu\"", + (unsigned long long)ncount2, + (unsigned long long)ncount1, + (unsigned long)count); + } + + 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) +{ + enum ndr_err_code ret = + ndr_token_store(ndr, &ndr->switch_list, p, val); + if (ret == NDR_ERR_RANGE) { + return ndr_push_error(ndr, ret, + "More than %d NDR tokens stored for switch_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +_PUBLIC_ enum ndr_err_code ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val) +{ + + enum ndr_err_code ret = + ndr_token_store(ndr, &ndr->switch_list, p, val); + if (ret == NDR_ERR_RANGE) { + return ndr_pull_error(ndr, ret, + "More than %d NDR tokens stored for switch_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +_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 (for push) and remove it from the list */ +_PUBLIC_ enum ndr_err_code ndr_push_steal_switch_value(struct ndr_push *ndr, + const void *p, + uint32_t *v) +{ + return ndr_token_retrieve(&ndr->switch_list, p, v); +} + +/* retrieve a switch value and remove it from the list */ +_PUBLIC_ uint32_t ndr_print_steal_switch_value(struct ndr_print *ndr, const void *p) +{ + enum ndr_err_code status; + uint32_t v; + + status = ndr_token_retrieve(&ndr->switch_list, p, &v); + if (!NDR_ERR_CODE_IS_SUCCESS(status)) { + return 0; + } + + return v; +} + +/* retrieve a switch value and remove it from the list */ +_PUBLIC_ enum ndr_err_code ndr_pull_steal_switch_value(struct ndr_pull *ndr, + const void *p, + uint32_t *v) +{ + return ndr_token_retrieve(&ndr->switch_list, p, v); +} + +/* + 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, void *p, + ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + ndr = ndr_pull_init_blob(blob, mem_ctx); + NDR_ERR_HAVE_NO_MEMORY(ndr); + NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p)); + talloc_free(ndr); + 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, + void *p, ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + uint32_t highest_ofs; + ndr = ndr_pull_init_blob(blob, mem_ctx); + NDR_ERR_HAVE_NO_MEMORY(ndr); + NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p)); + if (ndr->offset > ndr->relative_highest_offset) { + highest_ofs = ndr->offset; + } else { + highest_ofs = ndr->relative_highest_offset; + } + if (highest_ofs < ndr->data_size) { + enum ndr_err_code ret; + ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES, + "not all bytes consumed ofs[%u] size[%u]", + highest_ofs, ndr->data_size); + talloc_free(ndr); + return ret; + } + talloc_free(ndr); + return NDR_ERR_SUCCESS; +} + +/* + pull a struct from a blob using NDR - failing if all bytes are not consumed + + This only works for structures with NO allocated memory, like + objectSID and GUID. This helps because we parse these a lot. +*/ +_PUBLIC_ enum ndr_err_code ndr_pull_struct_blob_all_noalloc(const DATA_BLOB *blob, + void *p, ndr_pull_flags_fn_t fn) +{ + /* + * We init this structure on the stack here, to avoid a + * talloc() as otherwise this call to the fn() is assured not + * to be doing any allocation, eg SIDs and GUIDs. + * + * This allows us to keep the safety of the PIDL-generated + * code without the talloc() overhead. + */ + struct ndr_pull ndr = { + .data = blob->data, + .data_size = blob->length, + .current_mem_ctx = (void *)-1 + }; + uint32_t highest_ofs; + NDR_CHECK(fn(&ndr, NDR_SCALARS|NDR_BUFFERS, p)); + highest_ofs = MAX(ndr.offset, ndr.relative_highest_offset); + if (highest_ofs < ndr.data_size) { + enum ndr_err_code ret; + ret = ndr_pull_error( + &ndr, + NDR_ERR_UNREAD_BYTES, + "not all bytes consumed ofs[%"PRIu32"] " + "size[%"PRIu32"]", + highest_ofs, + ndr.data_size); + return ret; + } + 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, + void *p, + uint32_t level, ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + ndr = ndr_pull_init_blob(blob, mem_ctx); + NDR_ERR_HAVE_NO_MEMORY(ndr); + NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level)); + NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p)); + talloc_free(ndr); + 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, + void *p, + uint32_t level, ndr_pull_flags_fn_t fn) +{ + struct ndr_pull *ndr; + uint32_t highest_ofs; + ndr = ndr_pull_init_blob(blob, mem_ctx); + NDR_ERR_HAVE_NO_MEMORY(ndr); + NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level)); + NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p)); + if (ndr->offset > ndr->relative_highest_offset) { + highest_ofs = ndr->offset; + } else { + highest_ofs = ndr->relative_highest_offset; + } + if (highest_ofs < ndr->data_size) { + enum ndr_err_code ret; + ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES, + "not all bytes consumed ofs[%u] size[%u]", + highest_ofs, ndr->data_size); + talloc_free(ndr); + return ret; + } + talloc_free(ndr); + 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, const void *p, ndr_push_flags_fn_t fn) +{ + struct ndr_push *ndr; + ndr = ndr_push_init_ctx(mem_ctx); + 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 struct into a provided blob using NDR. + + We error because we want to have the performance issue (extra + talloc() calls) show up as an error, not just slower code. This is + used for things like GUIDs, which we expect to be a fixed size, and + SIDs that we can pre-calculate the size for. +*/ +_PUBLIC_ enum ndr_err_code ndr_push_struct_into_fixed_blob( + DATA_BLOB *blob, const void *p, ndr_push_flags_fn_t fn) +{ + struct ndr_push ndr = { + .data = blob->data, + .alloc_size = blob->length, + .fixed_buf_size = true + }; + + NDR_CHECK(fn(&ndr, NDR_SCALARS|NDR_BUFFERS, p)); + + if (ndr.offset != blob->length) { + return ndr_push_error(&ndr, NDR_ERR_BUFSIZE, + "buffer was either to large or small " + "ofs[%u] size[%zu]", + ndr.offset, blob->length); + } + + 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, void *p, + uint32_t level, ndr_push_flags_fn_t fn) +{ + struct ndr_push *ndr; + ndr = ndr_push_init_ctx(mem_ctx); + 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; + + /* Avoid following a NULL pointer */ + if (p == NULL) { + 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, 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; + + /* Avoid following a NULL pointer */ + if (p == NULL) { + return 0; + } + + ndr = ndr_push_init_ctx(NULL); + 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) +{ + enum ndr_err_code ret; + ndr->relative_base_offset = offset; + ret = ndr_token_store(ndr, &ndr->relative_base_list, p, offset); + if (ret == NDR_ERR_RANGE) { + return ndr_push_error(ndr, ret, + "More than %d NDR tokens stored for relative_base_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +/* + 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) +{ + enum ndr_err_code ret; + if (p == NULL) { + NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0)); + return NDR_ERR_SUCCESS; + } + NDR_CHECK(ndr_push_align(ndr, 4)); + ret = ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset); + if (ret == NDR_ERR_RANGE) { + return ndr_push_error(ndr, ret, + "More than %d NDR tokens stored for relative_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + NDR_CHECK(ret); + return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF); +} + +/* + push a short relative object - stage1 + this is called during SCALARS processing +*/ +_PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr1(struct ndr_push *ndr, const void *p) +{ + enum ndr_err_code ret; + if (p == NULL) { + NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 0)); + return NDR_ERR_SUCCESS; + } + NDR_CHECK(ndr_push_align(ndr, 2)); + ret = ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset); + if (ret == NDR_ERR_RANGE) { + return ndr_push_error(ndr, ret, + "More than %d NDR tokens stored for relative_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + NDR_CHECK(ret); + return ndr_push_uint16(ndr, NDR_SCALARS, 0xFFFF); +} +/* + push a relative object - stage2 + this is called during buffers processing +*/ +static 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; +} +/* + push a short relative object - stage2 + this is called during buffers processing +*/ +_PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr2(struct ndr_push *ndr, const void *p) +{ + uint32_t save_offset; + uint32_t ptr_offset = 0xFFFF; + uint32_t relative_offset; + size_t pad; + size_t align = 1; + + if (p == NULL) { + return NDR_ERR_SUCCESS; + } + + if (ndr->offset < ndr->relative_base_offset) { + return ndr_push_error(ndr, NDR_ERR_BUFSIZE, + "ndr_push_relative_ptr2 ndr->offset(%u) < ndr->relative_base_offset(%u)", + ndr->offset, ndr->relative_base_offset); + } + + relative_offset = ndr->offset - ndr->relative_base_offset; + + if (ndr->flags & LIBNDR_FLAG_NOALIGN) { + align = 1; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN2) { + align = 2; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN4) { + align = 4; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN8) { + align = 8; + } + + pad = ndr_align_size(relative_offset, align); + if (pad != 0) { + NDR_CHECK(ndr_push_zero(ndr, pad)); + } + + relative_offset = ndr->offset - ndr->relative_base_offset; + if (relative_offset > UINT16_MAX) { + return ndr_push_error(ndr, NDR_ERR_BUFSIZE, + "ndr_push_relative_ptr2 relative_offset(%u) > UINT16_MAX", + relative_offset); + } + + 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_short_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)", + ptr_offset, ndr->offset); + } + ndr->offset = ptr_offset; + NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, relative_offset)); + ndr->offset = save_offset; + return NDR_ERR_SUCCESS; +} + +/* + push a relative object - stage2 start + this is called during buffers processing +*/ +_PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_start(struct ndr_push *ndr, const void *p) +{ + enum ndr_err_code ret; + if (p == NULL) { + return NDR_ERR_SUCCESS; + } + if (!(ndr->flags & LIBNDR_FLAG_RELATIVE_REVERSE)) { + uint32_t relative_offset; + size_t pad; + size_t align = 1; + + if (ndr->offset < ndr->relative_base_offset) { + return ndr_push_error(ndr, NDR_ERR_BUFSIZE, + "ndr_push_relative_ptr2_start ndr->offset(%u) < ndr->relative_base_offset(%u)", + ndr->offset, ndr->relative_base_offset); + } + + relative_offset = ndr->offset - ndr->relative_base_offset; + + if (ndr->flags & LIBNDR_FLAG_NOALIGN) { + align = 1; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN2) { + align = 2; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN4) { + align = 4; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN8) { + align = 8; + } + + pad = ndr_align_size(relative_offset, align); + if (pad) { + NDR_CHECK(ndr_push_zero(ndr, pad)); + } + + return ndr_push_relative_ptr2(ndr, p); + } + if (ndr->relative_end_offset == -1) { + return ndr_push_error(ndr, NDR_ERR_RELATIVE, + "ndr_push_relative_ptr2_start RELATIVE_REVERSE flag set and relative_end_offset %d", + ndr->relative_end_offset); + } + ret = ndr_token_store(ndr, + &ndr->relative_begin_list, + p, + ndr->offset); + if (ret == NDR_ERR_RANGE) { + return ndr_push_error(ndr, ret, + "More than %d NDR tokens stored for array_size", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +/* + push a relative object - stage2 end + this is called during buffers processing +*/ +_PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_end(struct ndr_push *ndr, const void *p) +{ + uint32_t begin_offset = 0xFFFFFFFF; + ssize_t len; + uint32_t correct_offset = 0; + uint32_t align = 1; + uint32_t pad = 0; + + if (p == NULL) { + return NDR_ERR_SUCCESS; + } + + if (!(ndr->flags & LIBNDR_FLAG_RELATIVE_REVERSE)) { + return NDR_ERR_SUCCESS; + } + + if (ndr->flags & LIBNDR_FLAG_NO_NDR_SIZE) { + /* better say more than calculation a too small buffer */ + NDR_PUSH_ALIGN(ndr, 8); + return NDR_ERR_SUCCESS; + } + + if (ndr->relative_end_offset < ndr->offset) { + return ndr_push_error(ndr, NDR_ERR_RELATIVE, + "ndr_push_relative_ptr2_end:" + "relative_end_offset %u < offset %u", + ndr->relative_end_offset, ndr->offset); + } + + NDR_CHECK(ndr_token_retrieve(&ndr->relative_begin_list, p, &begin_offset)); + + /* we have marshalled a buffer, see how long it was */ + len = ndr->offset - begin_offset; + + if (len < 0) { + return ndr_push_error(ndr, NDR_ERR_RELATIVE, + "ndr_push_relative_ptr2_end:" + "offset %u - begin_offset %u < 0", + ndr->offset, begin_offset); + } + + if (ndr->relative_end_offset < len) { + return ndr_push_error(ndr, NDR_ERR_RELATIVE, + "ndr_push_relative_ptr2_end:" + "relative_end_offset %u < len %lld", + ndr->offset, (long long)len); + } + + /* the reversed offset is at the end of the main buffer */ + correct_offset = ndr->relative_end_offset - len; + + if (ndr->flags & LIBNDR_FLAG_NOALIGN) { + align = 1; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN2) { + align = 2; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN4) { + align = 4; + } else if (ndr->flags & LIBNDR_FLAG_ALIGN8) { + align = 8; + } + + pad = ndr_align_size(correct_offset, align); + if (pad) { + correct_offset += pad; + correct_offset -= align; + } + + if (correct_offset < begin_offset) { + return ndr_push_error(ndr, NDR_ERR_RELATIVE, + "ndr_push_relative_ptr2_end: " + "correct_offset %u < begin_offset %u", + correct_offset, begin_offset); + } + + if (len > 0) { + uint32_t clear_size = correct_offset - begin_offset; + + clear_size = MIN(clear_size, len); + + /* now move the marshalled buffer to the end of the main buffer */ + memmove(ndr->data + correct_offset, ndr->data + begin_offset, len); + + if (clear_size) { + /* and wipe out old buffer within the main buffer */ + memset(ndr->data + begin_offset, '\0', clear_size); + } + } + + /* and set the end offset for the next buffer */ + ndr->relative_end_offset = correct_offset; + + /* finally write the offset to the main buffer */ + ndr->offset = correct_offset; + NDR_CHECK(ndr_push_relative_ptr2(ndr, p)); + + /* restore to where we were in the main buffer */ + ndr->offset = begin_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) +{ + enum ndr_err_code ret; + ndr->relative_base_offset = offset; + ret = ndr_token_store(ndr, &ndr->relative_base_list, p, offset); + if (ret == NDR_ERR_RANGE) { + return ndr_pull_error(ndr, ret, + "More than %d NDR tokens stored for relative_base_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +/* + 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) +{ + enum ndr_err_code ret; + 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); + } + ret = ndr_token_store(ndr, &ndr->relative_list, p, rel_offset); + if (ret == NDR_ERR_RANGE) { + return ndr_pull_error(ndr, ret, + "More than %d NDR tokens stored for relative_list", + NDR_TOKEN_MAX_LIST_SIZE); + } + return ret; +} + +/* + 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); +} + +static const struct { + enum ndr_err_code err; + const char *string; +} ndr_err_code_strings[] = { + { NDR_ERR_SUCCESS, "Success" }, + { NDR_ERR_ARRAY_SIZE, "Bad Array Size" }, + { NDR_ERR_BAD_SWITCH, "Bad Switch" }, + { NDR_ERR_OFFSET, "Offset Error" }, + { NDR_ERR_RELATIVE, "Relative Pointer Error" }, + { NDR_ERR_CHARCNV, "Character Conversion Error" }, + { NDR_ERR_LENGTH, "Length Error" }, + { NDR_ERR_SUBCONTEXT, "Subcontext Error" }, + { NDR_ERR_COMPRESSION, "Compression Error" }, + { NDR_ERR_STRING, "String Error" }, + { NDR_ERR_VALIDATE, "Validate Error" }, + { NDR_ERR_BUFSIZE, "Buffer Size Error" }, + { NDR_ERR_ALLOC, "Allocation Error" }, + { NDR_ERR_RANGE, "Range Error" }, + { NDR_ERR_TOKEN, "Token Error" }, + { NDR_ERR_IPV4ADDRESS, "IPv4 Address Error" }, + { NDR_ERR_INVALID_POINTER, "Invalid Pointer" }, + { NDR_ERR_UNREAD_BYTES, "Unread Bytes" }, + { NDR_ERR_NDR64, "NDR64 assertion error" }, + { NDR_ERR_INCOMPLETE_BUFFER, "Incomplete Buffer" }, + { NDR_ERR_MAX_RECURSION_EXCEEDED, "Maximum Recursion Exceeded" }, + { NDR_ERR_UNDERFLOW, "Underflow" }, + { 0, NULL } +}; + +_PUBLIC_ const char *ndr_map_error2string(enum ndr_err_code ndr_err) +{ + int i; + for (i = 0; ndr_err_code_strings[i].string != NULL; i++) { + if (ndr_err_code_strings[i].err == ndr_err) + return ndr_err_code_strings[i].string; + } + return "Unknown error"; +} |