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Generate RFC4122 compliant UUIDs

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Even though http://libvirt.org/formatdomain.html#elementsMetadata
states that it requires RFC4122 compliance UUIDs that are generated
by virUUIDGenerate() are not. Following patch modifies generated
UUIDs to conform to rules described in RFC.

Signed-off-by: Milos Vyletel <milos.vyletel@sde.cz>
This commit is contained in:
Milos Vyletel 2013-04-08 14:10:54 -04:00 committed by Eric Blake
parent 1bd955ed60
commit 396c4d34f8
1 changed files with 19 additions and 0 deletions
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19
src/util/viruuid.c
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@ -114,6 +114,25 @@ virUUIDGenerate(unsigned char *uuid)
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;
}