mirror of https://github.com/neutrinolabs/xrdp
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) 2021 Matt Burt, all xrdp contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/**
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* @file common/guid.c
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* @brief GUID manipulation definitions
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*/
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#if defined(HAVE_CONFIG_H)
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#include <config_ac.h>
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#endif
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#include "guid.h"
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#include "os_calls.h"
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#include "string_calls.h"
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enum
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{
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/* Field offsets in the UUID */
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E_CLOCK_SEQ_HI_AND_RESERVED = 8,
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E_TIME_HI_AND_VERSION_MSB = 7,
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/* UUID versions from RFC4122 section 4.1.3 */
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E_UUID_VERSION_RANDOM = 4
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};
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struct guid
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guid_new(void)
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{
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struct guid guid = {0};
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g_random(guid.g, sizeof(guid.g));
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/* Show this UUID as conforming to RFC4122 (section 4.1.1) */
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guid.g[E_CLOCK_SEQ_HI_AND_RESERVED] &= ~0x40; /* Clear bit 6 */
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guid.g[E_CLOCK_SEQ_HI_AND_RESERVED] |= (char)0x80; /* Set bit 7 */
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guid.g[E_TIME_HI_AND_VERSION_MSB] &= ~0xf0;
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guid.g[E_TIME_HI_AND_VERSION_MSB] |= (E_UUID_VERSION_RANDOM << 4);
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return guid;
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}
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void
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guid_clear(struct guid *guid)
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{
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g_memset(&guid->g, '\x00', GUID_SIZE);
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}
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int
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guid_is_set(const struct guid *guid)
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{
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unsigned int i;
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int rv = 0;
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if (guid != NULL)
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{
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for (i = 0 ; i < GUID_SIZE; ++i)
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{
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if (guid->g[i] != '\x00')
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{
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rv = 1;
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break;
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}
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}
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}
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return rv;
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}
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const char *guid_to_str(const struct guid *src, char *dest)
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{
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const unsigned char *guid = (const unsigned char *)src->g;
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/*
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* Flipping integers into little-endian
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* See also: https://devblogs.microsoft.com/oldnewthing/20220928-00/?p=107221
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*/
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g_sprintf(dest, "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
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guid[3], guid[2], guid[1], guid[0],
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guid[5], guid[4],
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guid[7], guid[6],
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guid[8], guid[9],
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guid[10], guid[11], guid[12], guid[13], guid[14], guid[15]);
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return dest;
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}
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