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91d5ea2ae9
GUID_from_data_blob() was relying on sscanf to parse strings, which was slow and quite accepting of invalid GUIDs. Instead we directly read a fixed number of hex bytes for each field. This now passes the samba4.local.ndr.*.guid_from_string_invalid tests. Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Autobuild-User(master): Douglas Bagnall <dbagnall@samba.org> Autobuild-Date(master): Wed Dec 14 08:55:42 CET 2016 on sn-devel-144
383 lines
8.5 KiB
C
383 lines
8.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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UUID/GUID functions
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Copyright (C) Theodore Ts'o 1996, 1997,
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Copyright (C) Jim McDonough 2002.
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Copyright (C) Andrew Tridgell 2003.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "librpc/ndr/libndr.h"
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#include "librpc/gen_ndr/ndr_misc.h"
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/**
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build a NDR blob from a GUID
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*/
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_PUBLIC_ NTSTATUS GUID_to_ndr_blob(const struct GUID *guid, TALLOC_CTX *mem_ctx, DATA_BLOB *b)
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{
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enum ndr_err_code ndr_err;
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*b = data_blob_talloc(mem_ctx, NULL, 16);
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if (b->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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ndr_err = ndr_push_struct_into_fixed_blob(
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b, guid, (ndr_push_flags_fn_t)ndr_push_GUID);
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return ndr_map_error2ntstatus(ndr_err);
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}
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/**
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build a GUID from a NDR data blob
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*/
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_PUBLIC_ NTSTATUS GUID_from_ndr_blob(const DATA_BLOB *b, struct GUID *guid)
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{
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enum ndr_err_code ndr_err =
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ndr_pull_struct_blob_all_noalloc(b, guid,
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(ndr_pull_flags_fn_t)ndr_pull_GUID);
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return ndr_map_error2ntstatus(ndr_err);
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}
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static NTSTATUS read_hex_bytes(const char *s, uint hexchars, uint64_t *dest)
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{
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uint64_t x = 0;
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uint i;
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char c;
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if ((hexchars & 1) || hexchars > 16) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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for (i = 0; i < hexchars; i++) {
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x <<= 4;
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c = s[i];
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if (c >= '0' && c <= '9') {
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x += c - '0';
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}
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else if (c >= 'a' && c <= 'f') {
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x += c - 'a' + 10;
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}
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else if (c >= 'A' && c <= 'F') {
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x += c - 'A' + 10;
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}
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else {
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/* BAD character (including '\0') */
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return NT_STATUS_INVALID_PARAMETER;
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}
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}
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*dest = x;
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return NT_STATUS_OK;
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}
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static NTSTATUS parse_guid_string(const char *s,
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uint32_t *time_low,
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uint32_t *time_mid,
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uint32_t *time_hi_and_version,
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uint32_t *clock_seq,
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uint32_t *node)
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{
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uint64_t tmp;
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NTSTATUS status;
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int i;
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/* "e12b56b6-0a95-11d1-adbb-00c04fd8d5cd"
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| | | | |
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| | | | \ node[6]
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| | | \_____ clock_seq[2]
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| | \__________ time_hi_and_version
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| \_______________ time_mid
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\_____________________ time_low
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*/
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status = read_hex_bytes(s, 8, &tmp);
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if (!NT_STATUS_IS_OK(status) || s[8] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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*time_low = tmp;
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s += 9;
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status = read_hex_bytes(s, 4, &tmp);
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if (!NT_STATUS_IS_OK(status) || s[4] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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*time_mid = tmp;
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s += 5;
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status = read_hex_bytes(s, 4, &tmp);
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if (!NT_STATUS_IS_OK(status) || s[4] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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*time_hi_and_version = tmp;
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s += 5;
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for (i = 0; i < 2; i++) {
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status = read_hex_bytes(s, 2, &tmp);
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if (!NT_STATUS_IS_OK(status)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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clock_seq[i] = tmp;
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s += 2;
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}
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if (s[0] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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s++;
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for (i = 0; i < 6; i++) {
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status = read_hex_bytes(s, 2, &tmp);
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if (!NT_STATUS_IS_OK(status)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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node[i] = tmp;
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s += 2;
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}
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return NT_STATUS_OK;
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}
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/**
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build a GUID from a string
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*/
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_PUBLIC_ NTSTATUS GUID_from_data_blob(const DATA_BLOB *s, struct GUID *guid)
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{
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NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
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uint32_t time_low;
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uint32_t time_mid, time_hi_and_version;
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uint32_t clock_seq[2];
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uint32_t node[6];
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uint8_t buf16[16];
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DATA_BLOB blob16 = data_blob_const(buf16, sizeof(buf16));
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int i;
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if (s->data == NULL) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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switch(s->length) {
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case 36:
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{
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status = parse_guid_string((char *)s->data,
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&time_low,
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&time_mid,
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&time_hi_and_version,
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clock_seq,
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node);
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break;
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}
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case 38:
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{
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if (s->data[0] != '{' || s->data[37] != '}') {
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break;
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}
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status = parse_guid_string((char *)s->data + 1,
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&time_low,
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&time_mid,
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&time_hi_and_version,
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clock_seq,
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node);
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break;
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}
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case 32:
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{
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size_t rlen = strhex_to_str((char *)blob16.data, blob16.length,
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(const char *)s->data, s->length);
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if (rlen != blob16.length) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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s = &blob16;
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return GUID_from_ndr_blob(s, guid);
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}
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case 16:
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return GUID_from_ndr_blob(s, guid);
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default:
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status = NT_STATUS_INVALID_PARAMETER;
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break;
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}
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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guid->time_low = time_low;
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guid->time_mid = time_mid;
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guid->time_hi_and_version = time_hi_and_version;
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guid->clock_seq[0] = clock_seq[0];
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guid->clock_seq[1] = clock_seq[1];
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for (i=0;i<6;i++) {
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guid->node[i] = node[i];
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}
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return NT_STATUS_OK;
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}
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/**
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build a GUID from a string
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*/
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_PUBLIC_ NTSTATUS GUID_from_string(const char *s, struct GUID *guid)
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{
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DATA_BLOB blob = data_blob_string_const(s);
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return GUID_from_data_blob(&blob, guid);
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}
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/**
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* generate a random GUID
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*/
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_PUBLIC_ struct GUID GUID_random(void)
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{
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struct GUID guid;
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generate_random_buffer((uint8_t *)&guid, sizeof(guid));
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guid.clock_seq[0] = (guid.clock_seq[0] & 0x3F) | 0x80;
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guid.time_hi_and_version = (guid.time_hi_and_version & 0x0FFF) | 0x4000;
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return guid;
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}
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/**
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* generate an empty GUID
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*/
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_PUBLIC_ struct GUID GUID_zero(void)
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{
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struct GUID guid;
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ZERO_STRUCT(guid);
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return guid;
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}
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_PUBLIC_ bool GUID_all_zero(const struct GUID *u)
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{
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if (u->time_low != 0 ||
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u->time_mid != 0 ||
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u->time_hi_and_version != 0 ||
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u->clock_seq[0] != 0 ||
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u->clock_seq[1] != 0 ||
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!all_zero(u->node, 6)) {
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return false;
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}
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return true;
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}
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_PUBLIC_ bool GUID_equal(const struct GUID *u1, const struct GUID *u2)
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{
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return (GUID_compare(u1, u2) == 0);
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}
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_PUBLIC_ int GUID_compare(const struct GUID *u1, const struct GUID *u2)
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{
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if (u1->time_low != u2->time_low) {
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return u1->time_low > u2->time_low ? 1 : -1;
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}
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if (u1->time_mid != u2->time_mid) {
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return u1->time_mid > u2->time_mid ? 1 : -1;
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}
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if (u1->time_hi_and_version != u2->time_hi_and_version) {
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return u1->time_hi_and_version > u2->time_hi_and_version ? 1 : -1;
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}
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if (u1->clock_seq[0] != u2->clock_seq[0]) {
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return u1->clock_seq[0] > u2->clock_seq[0] ? 1 : -1;
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}
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if (u1->clock_seq[1] != u2->clock_seq[1]) {
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return u1->clock_seq[1] > u2->clock_seq[1] ? 1 : -1;
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}
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return memcmp(u1->node, u2->node, 6);
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}
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/**
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its useful to be able to display these in debugging messages
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*/
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_PUBLIC_ char *GUID_string(TALLOC_CTX *mem_ctx, const struct GUID *guid)
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{
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struct GUID_txt_buf buf;
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return talloc_strdup(mem_ctx, GUID_buf_string(guid, &buf));
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}
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/**
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* Does the same without allocating memory, using the structure buffer.
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* Useful for debug messages, so that you do not have to talloc_free the result
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*/
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_PUBLIC_ char* GUID_buf_string(const struct GUID *guid,
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struct GUID_txt_buf *dst)
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{
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if (!guid) {
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return NULL;
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}
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snprintf(dst->buf, sizeof(dst->buf),
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"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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guid->time_low, guid->time_mid,
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guid->time_hi_and_version,
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guid->clock_seq[0],
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guid->clock_seq[1],
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guid->node[0], guid->node[1],
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guid->node[2], guid->node[3],
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guid->node[4], guid->node[5]);
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return dst->buf;
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}
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_PUBLIC_ char *GUID_string2(TALLOC_CTX *mem_ctx, const struct GUID *guid)
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{
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char *ret, *s = GUID_string(mem_ctx, guid);
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ret = talloc_asprintf(mem_ctx, "{%s}", s);
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talloc_free(s);
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return ret;
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}
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_PUBLIC_ char *GUID_hexstring(TALLOC_CTX *mem_ctx, const struct GUID *guid)
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{
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char *ret;
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DATA_BLOB guid_blob;
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TALLOC_CTX *tmp_mem;
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NTSTATUS status;
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tmp_mem = talloc_new(mem_ctx);
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if (!tmp_mem) {
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return NULL;
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}
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status = GUID_to_ndr_blob(guid, tmp_mem, &guid_blob);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(tmp_mem);
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return NULL;
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}
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ret = data_blob_hex_string_upper(mem_ctx, &guid_blob);
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talloc_free(tmp_mem);
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return ret;
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}
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_PUBLIC_ bool ndr_policy_handle_empty(const struct policy_handle *h)
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{
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return (h->handle_type == 0 && GUID_all_zero(&h->uuid));
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}
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_PUBLIC_ bool ndr_policy_handle_equal(const struct policy_handle *hnd1,
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const struct policy_handle *hnd2)
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{
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if (!hnd1 || !hnd2) {
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return false;
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}
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return (memcmp(hnd1, hnd2, sizeof(*hnd1)) == 0);
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}
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