[lvm-devel] [PATCH 1/2] Add generic function to read /dev/urandom, used in uuid calculation.
Dave Wysochanski
dwysocha at redhat.com
Sat Dec 6 16:12:45 UTC 2008
Signed-off-by: Dave Wysochanski <dwysocha at redhat.com>
---
include/.symlinks | 1 +
lib/Makefile.in | 1 +
lib/misc/random.c | 29 +++++++++++++++++++++++++++++
lib/misc/random.h | 20 ++++++++++++++++++++
lib/uuid/uuid.c | 14 ++------------
5 files changed, 53 insertions(+), 12 deletions(-)
create mode 100644 lib/misc/random.c
create mode 100644 lib/misc/random.h
diff --git a/include/.symlinks b/include/.symlinks
index b70b96d..9039f67 100644
--- a/include/.symlinks
+++ b/include/.symlinks
@@ -47,6 +47,7 @@
../lib/misc/lvm-globals.h
../lib/misc/lvm-string.h
../lib/misc/lvm-wrappers.h
+../lib/misc/random.h
../lib/misc/sharedlib.h
../lib/report/report.h
../lib/uuid/uuid.h
diff --git a/lib/Makefile.in b/lib/Makefile.in
index 54092cd..71f98d7 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -80,6 +80,7 @@ SOURCES =\
misc/lvm-globals.c \
misc/lvm-string.c \
misc/lvm-wrappers.c \
+ misc/random.c \
misc/timestamp.c \
misc/util.c \
mm/memlock.c \
diff --git a/lib/misc/random.c b/lib/misc/random.c
new file mode 100644
index 0000000..8ebfb89
--- /dev/null
+++ b/lib/misc/random.c
@@ -0,0 +1,29 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "lib.h"
+#include "random.h"
+
+int read_urandom(void *buf, size_t len)
+{
+ int fd;
+
+ if ((fd = open("/dev/urandom", O_RDONLY)) < 0) {
+ log_sys_error("open", "get_random: /dev/urandom");
+ return 0;
+ }
+
+ if (read(fd, buf, len) != (ssize_t) len) {
+ log_sys_error("read", "get_random: /dev/urandom");
+ if (close(fd))
+ stack;
+ return 0;
+ }
+
+ if (close(fd))
+ stack;
+
+ return 1;
+}
+
diff --git a/lib/misc/random.h b/lib/misc/random.h
new file mode 100644
index 0000000..1347fdd
--- /dev/null
+++ b/lib/misc/random.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+ *
+ * This file is part of LVM2.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License v.2.1.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _LVM_RANDOM_H
+#define _LVM_RANDOM_H
+
+int read_urandom(void *buf, size_t len);
+
+#endif
diff --git a/lib/uuid/uuid.c b/lib/uuid/uuid.c
index 39252c0..5069d1d 100644
--- a/lib/uuid/uuid.c
+++ b/lib/uuid/uuid.c
@@ -15,6 +15,7 @@
#include "lib.h"
#include "uuid.h"
+#include "random.h"
#include <assert.h>
#include <sys/stat.h>
@@ -94,25 +95,14 @@ int lvid_in_restricted_range(union lvid *lvid)
int id_create(struct id *id)
{
- int randomfile;
unsigned i;
size_t len = sizeof(id->uuid);
memset(id->uuid, 0, len);
- if ((randomfile = open("/dev/urandom", O_RDONLY)) < 0) {
- log_sys_error("open", "id_create: /dev/urandom");
+ if (!read_urandom(&id->uuid, len)) {
return 0;
}
- if (read(randomfile, id->uuid, len) != (ssize_t) len) {
- log_sys_error("read", "id_create: /dev/urandom");
- if (close(randomfile))
- stack;
- return 0;
- }
- if (close(randomfile))
- stack;
-
/*
* Skip out the last 2 chars in randomized creation for LVM1
* backwards compatibility.
--
1.5.5.1
More information about the lvm-devel
mailing list