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authorMichael Adam <obnox@samba.org>2013-04-25 19:47:00 +0200
committerChristian Ambach <ambi@samba.org>2013-05-06 16:33:39 +0200
commit30a27ba428f346ff2fd56f9727ce0f1fb18a5a41 (patch)
tree394d3d305760563ca25728fb04e6ee709557ac5e /source3
parenta0ea6c2536b6b07f2fee799518b5f84da36e53ba (diff)
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s3:idmap:autorid: make calculation in idmap_autorid_sid_to_id much more obvious
This is my attempt to make the sid->unix-id calculation much more obvious. Especially with the introduction of the multi-range support an the originally named "multiplier", the calculation id = low_id + range_size * domain_number + rid - range_size * multiplier was rather opaque to me. What really happens here is this: The rid is split into a reduced_rid part that is < rangesize and a multiple of rangesize. This is given by the formula rid = rid % range_size + (rid / range_size) * range_size We define reduced_rid := rid % range_size and domain_range_index := rid / range_size ( == the original multiplier) and the original formula is equivalent to: id = reduced_rid + low_id + range_number * range_size; and reads id = reduced_rid + range_minvalue if we set range_minvalue := low_id + range_number * range_size. Signed-off-by: Michael Adam <obnox@samba.org> Reviewed-by: Christian Ambach <ambi@samba.org>
Diffstat (limited to 'source3')
-rw-r--r--source3/winbindd/idmap_autorid.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/source3/winbindd/idmap_autorid.c b/source3/winbindd/idmap_autorid.c
index ce55af97b6..d0a7b675e3 100644
--- a/source3/winbindd/idmap_autorid.c
+++ b/source3/winbindd/idmap_autorid.c
@@ -351,12 +351,15 @@ static NTSTATUS idmap_autorid_sid_to_id(struct autorid_global_config *global,
struct id_map *map)
{
uint32_t rid;
+ uint32_t reduced_rid;
+ uint32_t range_start;
sid_peek_rid(map->sid, &rid);
- map->xid.id = global->minvalue +
- (global->rangesize * range->rangenum) + rid -
- (global->rangesize * range->domain_range_index);
+ reduced_rid = rid % global->rangesize;
+ range_start = global->minvalue + range->rangenum * global->rangesize;
+
+ map->xid.id = reduced_rid + range_start;
map->xid.type = ID_TYPE_BOTH;
/* We **really** should have some way of validating