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https://github.com/samba-team/samba.git
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a106fefcfb
When comparing two unsigned values you can't just subtract them. Imagine you are comparing: "uint32_t u1" and "uint32_t u2". If you use "u1 - u2" and u2 is zero, then the signed integer result will depend on the top bit of u1. This error occurs in a few places in Samba. For DRS replication it resulted in corrupt uptodateness vectors.
329 lines
8.2 KiB
C
329 lines
8.2 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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ndr_err = ndr_push_struct_blob(b, mem_ctx, NULL, guid,
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(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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TALLOC_CTX *mem_ctx;
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mem_ctx = talloc_new(NULL);
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NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
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ndr_err = ndr_pull_struct_blob_all(b, mem_ctx, NULL, guid,
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(ndr_pull_flags_fn_t)ndr_pull_GUID);
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talloc_free(mem_ctx);
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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 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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if (s->length == 36) {
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TALLOC_CTX *mem_ctx;
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const char *string;
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mem_ctx = talloc_new(NULL);
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NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
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string = talloc_strndup(mem_ctx, (const char *)s->data, s->length);
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NT_STATUS_HAVE_NO_MEMORY(string);
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if (11 == sscanf(string,
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"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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&time_low, &time_mid, &time_hi_and_version,
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&clock_seq[0], &clock_seq[1],
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&node[0], &node[1], &node[2], &node[3], &node[4], &node[5])) {
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status = NT_STATUS_OK;
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}
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talloc_free(mem_ctx);
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} else if (s->length == 38) {
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TALLOC_CTX *mem_ctx;
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const char *string;
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mem_ctx = talloc_new(NULL);
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NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
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string = talloc_strndup(mem_ctx, (const char *)s->data, s->length);
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NT_STATUS_HAVE_NO_MEMORY(string);
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if (11 == sscanf((const char *)s->data,
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"{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
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&time_low, &time_mid, &time_hi_and_version,
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&clock_seq[0], &clock_seq[1],
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&node[0], &node[1], &node[2], &node[3], &node[4], &node[5])) {
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status = NT_STATUS_OK;
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}
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talloc_free(mem_ctx);
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} else if (s->length == 32) {
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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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/* goto the ndr_pull_struct_blob() path */
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status = NT_STATUS_OK;
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s = &blob16;
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}
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}
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if (s->length == 16) {
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return GUID_from_ndr_blob(s, guid);
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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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build a GUID from a string
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*/
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_PUBLIC_ NTSTATUS NS_GUID_from_string(const char *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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int i;
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if (s == NULL) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (11 == sscanf(s, "%08x-%04x%04x-%02x%02x%02x%02x-%02x%02x%02x%02x",
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&time_low, &time_mid, &time_hi_and_version,
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&clock_seq[0], &clock_seq[1],
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&node[0], &node[1], &node[2], &node[3], &node[4], &node[5])) {
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status = NT_STATUS_OK;
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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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* 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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if (u1->time_low != u2->time_low ||
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u1->time_mid != u2->time_mid ||
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u1->time_hi_and_version != u2->time_hi_and_version ||
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u1->clock_seq[0] != u2->clock_seq[0] ||
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u1->clock_seq[1] != u2->clock_seq[1] ||
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memcmp(u1->node, u2->node, 6) != 0) {
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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_ 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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return talloc_asprintf(mem_ctx,
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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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}
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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_ char *NS_GUID_string(TALLOC_CTX *mem_ctx, const struct GUID *guid)
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{
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return talloc_asprintf(mem_ctx,
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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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}
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_PUBLIC_ bool policy_handle_empty(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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