/* * QEMU UUID functions * * Copyright 2016 Red Hat, Inc. * * Authors: * Fam Zheng <famz@redhat.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include "qemu/osdep.h" #include "qemu-common.h" #include "qemu/uuid.h" #include "qemu/bswap.h" void qemu_uuid_generate(QemuUUID *uuid) { int i; uint32_t tmp[4]; QEMU_BUILD_BUG_ON(sizeof(QemuUUID) != 16); for (i = 0; i < 4; ++i) { tmp[i] = g_random_int(); } memcpy(uuid, tmp, sizeof(tmp)); /* Set the two most significant bits (bits 6 and 7) of the clock_seq_hi_and_reserved to zero and one, respectively. */ uuid->data[8] = (uuid->data[8] & 0x3f) | 0x80; /* Set the four most significant bits (bits 12 through 15) of the time_hi_and_version field to the 4-bit version number. */ uuid->data[6] = (uuid->data[6] & 0xf) | 0x40; } int qemu_uuid_is_null(const QemuUUID *uu) { static QemuUUID null_uuid; return memcmp(uu, &null_uuid, sizeof(QemuUUID)) == 0; } void qemu_uuid_unparse(const QemuUUID *uuid, char *out) { const unsigned char *uu = &uuid->data[0]; snprintf(out, UUID_FMT_LEN + 1, UUID_FMT, uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]); } char *qemu_uuid_unparse_strdup(const QemuUUID *uuid) { const unsigned char *uu = &uuid->data[0]; return g_strdup_printf(UUID_FMT, uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]); } static bool qemu_uuid_is_valid(const char *str) { int i; for (i = 0; i < strlen(str); i++) { const char c = str[i]; if (i == 8 || i == 13 || i == 18 || i == 23) { if (str[i] != '-') { return false; } } else { if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')) { continue; } return false; } } return i == 36; } int qemu_uuid_parse(const char *str, QemuUUID *uuid) { unsigned char *uu = &uuid->data[0]; int ret; if (!qemu_uuid_is_valid(str)) { return -1; } ret = sscanf(str, UUID_FMT, &uu[0], &uu[1], &uu[2], &uu[3], &uu[4], &uu[5], &uu[6], &uu[7], &uu[8], &uu[9], &uu[10], &uu[11], &uu[12], &uu[13], &uu[14], &uu[15]); if (ret != 16) { return -1; } return 0; } /* Swap from UUID format endian (BE) to the opposite or vice versa. */ void qemu_uuid_bswap(QemuUUID *uuid) { assert(QEMU_PTR_IS_ALIGNED(uuid, sizeof(uint32_t))); bswap32s(&uuid->fields.time_low); bswap16s(&uuid->fields.time_mid); bswap16s(&uuid->fields.time_high_and_version); }