/**
* virUUIDGenerate:
* @uuid: array of VIR_UUID_BUFLEN bytes to store the new UUID
*
* Generates a randomized unique identifier.
*
* Returns 0 in case of success and -1 in case of failure
*/
int
virUUIDGenerate(unsigned char *uuid)
{
int err;
if (uuid == NULL)
return(-1);
if ((err = virUUIDGenerateRandomBytes(uuid, VIR_UUID_BUFLEN))) {
char ebuf[1024];
VIR_WARN("Falling back to pseudorandom UUID,"
" failed to generate random bytes: %s",
virStrerror(err, ebuf, sizeof ebuf));
err = virUUIDGeneratePseudoRandomBytes(uuid, VIR_UUID_BUFLEN);
}
return(err);
}
/**
* virUUIDGenerate:
* @uuid: array of VIR_UUID_BUFLEN bytes to store the new UUID
*
* Generates a randomized unique identifier.
*
* Returns 0 in case of success and -1 in case of failure
*/
int
virUUIDGenerate(unsigned char *uuid)
{
int err;
if (uuid == NULL)
return -1;
if ((err = virUUIDGenerateRandomBytes(uuid, VIR_UUID_BUFLEN))) {
char ebuf[1024];
VIR_WARN("Falling back to pseudorandom UUID,"
" failed to generate random bytes: %s",
virStrerror(err, ebuf, sizeof(ebuf)));
err = virUUIDGeneratePseudoRandomBytes(uuid, VIR_UUID_BUFLEN);
}
/*
* Make UUID RFC 4122 compliant. Following form will be used:
*
* xxxxxxxx-xxxx-Axxx-Bxxx-xxxxxxxxxxxx
*
* where
* A is version defined in 4.1.3 of RFC
* Msb0 Msb1 Msb2 Msb3 Version Description
* 0 1 0 0 4 The randomly or pseudo-
* randomly generated version
* specified in this document.
*
* B is variant defined in 4.1.1 of RFC
* Msb0 Msb1 Msb2 Description
* 1 0 x The variant specified in this document.
*/
uuid[6] = (uuid[6] & 0x0F) | (4 << 4);
uuid[8] = (uuid[8] & 0x3F) | (2 << 6);
return err;
}
