1 files changed, 25 insertions, 0 deletions
diff --git a/liblogfs/perm.c b/liblogfs/perm.c
new file mode 100644
index 00000000..9ac8d976
--- /dev/null
+++ b/liblogfs/perm.c
@@ -0,0 +1,25 @@
+#include "lib9.h"
+#include "logfs.h"
+#include "local.h"
+
+int
+logfsuserpermcheck(LogfsServer *s, Entry *e, Fid *f, ulong permmask)
+{
+	if(s->openflags & LogfsOpenFlagNoPerm)
+		return 1;
+	if((e->perm & permmask) == permmask)
+		/* the whole world can do this */
+		return 1;
+	if(((e->perm >> 6) & permmask) == permmask) {
+		/* maybe we're the owner */
+		char *uname = logfsisfindnamefromid(s->is, e->uid);
+		if(uname == f->uname)
+			return 1;
+	}
+	if(((e->perm >> 3) & permmask) == permmask) {
+		/* maybe we're in the group */
+		Group *g = logfsisfindgroupfromid(s->is, e->gid);
+		return g && logfsisgroupunameismember(s->is, g, f->uname);
+	}
+	return 0;
+}