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[settings] Support formatting UUIDs as little-endian GUIDs

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The RFC4122 specification defines UUIDs as being in network byte
order, but an unfortunately significant amount of (mostly Microsoft)
software treats them as having the first three fields in little-endian
byte order.

In an ideal world, any server-side software that compares UUIDs for
equality would perform an endian-insensitive comparison (analogous to
comparing strings for equality using a case-insensitive comparison),
and would therefore not care about byte order differences.

Define a setting type name ":guid" to allow a UUID setting to be
formatted in little-endian order, to simplify interoperability with
server-side software that expects such a formatting.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2022-01-04 13:31:15 +00:00
parent 9062544f6a
commit f43c2fd697
4 changed files with 31 additions and 6 deletions
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3
src/interface/smbios/smbios_settings.c
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@@ -140,7 +140,8 @@ static int smbios_fetch ( struct settings *settings __unused,
* is 2.6 or higher; we match this behaviour.
*/
raw = &buf[tag_offset];
if ( ( setting->type == &setting_type_uuid ) &&
if ( ( ( setting->type == &setting_type_uuid ) ||
( setting->type == &setting_type_guid ) ) &&
( tag_len == sizeof ( uuid ) ) &&
( smbios_version() >= SMBIOS_VERSION ( 2, 6 ) ) ) {
DBG ( "SMBIOS detected mangled UUID\n" );