support for mount by label (not yet tested)

Also adds findfs applet. Closes bug 1143.

1 files changed, 76 insertions, 0 deletions

diff --git a/util-linux/volume_id/luks.c b/util-linux/volume_id/luks.c
new file mode 100644
index 000000000..e73ce3a03
--- /dev/null
+++ b/util-linux/volume_id/luks.c
@@ -0,0 +1,76 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
+ *
+ *      This library is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU Lesser General Public
+ *      License as published by the Free Software Foundation; either
+ *      version 2.1 of the License, or (at your option) any later version.
+ *
+ *      This library is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *      Lesser General Public License for more details.
+ *
+ *      You should have received a copy of the GNU Lesser General Public
+ *      License along with this library; if not, write to the Free Software
+ *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "volume_id_internal.h"
+
+#define SECTOR_SHIFT                    9
+#define SECTOR_SIZE                     (1 << SECTOR_SHIFT)
+
+#define LUKS_CIPHERNAME_L               32
+#define LUKS_CIPHERMODE_L               32
+#define LUKS_HASHSPEC_L                 32
+#define LUKS_DIGESTSIZE                 20
+#define LUKS_SALTSIZE                   32
+#define LUKS_NUMKEYS                    8
+
+static const uint8_t LUKS_MAGIC[] = { 'L','U','K','S', 0xba, 0xbe };
+#define LUKS_MAGIC_L 6
+#define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1)
+#define UUID_STRING_L 40
+
+struct luks_phdr {
+        uint8_t         magic[LUKS_MAGIC_L];
+        uint16_t        version;
+        uint8_t         cipherName[LUKS_CIPHERNAME_L];
+        uint8_t         cipherMode[LUKS_CIPHERMODE_L];
+        uint8_t         hashSpec[LUKS_HASHSPEC_L];
+        uint32_t        payloadOffset;
+        uint32_t        keyBytes;
+        uint8_t         mkDigest[LUKS_DIGESTSIZE];
+        uint8_t         mkDigestSalt[LUKS_SALTSIZE];
+        uint32_t        mkDigestIterations;
+        uint8_t         uuid[UUID_STRING_L];
+        struct {
+                uint32_t        active;
+                uint32_t        passwordIterations;
+                uint8_t         passwordSalt[LUKS_SALTSIZE];
+                uint32_t        keyMaterialOffset;
+                uint32_t        stripes;
+        } keyblock[LUKS_NUMKEYS];
+};
+
+int volume_id_probe_luks(struct volume_id *id, uint64_t off)
+{
+        struct luks_phdr *header;
+
+        header = volume_id_get_buffer(id, off, LUKS_PHDR_SIZE);
+        if (header == NULL)
+                return -1;
+
+        if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
+                return -1;
+
+        volume_id_set_usage(id, VOLUME_ID_CRYPTO);
+        volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
+
+        id->type = "crypto_LUKS";
+
+        return 0;
+}