Added 'zero' command to wipe partition tables and superblocks.

4 files changed, 81 insertions, 0 deletions

diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 91237e23..c2c4a118 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -41,6 +41,7 @@ guestfsd_SOURCES = \
 	sync.c \
 	tar.c \
 	upload.c \
+	zero.c \
 	../src/guestfs_protocol.h \
 	../src/guestfs_protocol.c
 
diff --git a/daemon/actions.h b/daemon/actions.h
index 74555862..501e3377 100644
--- a/daemon/actions.h
+++ b/daemon/actions.h
@@ -105,3 +105,4 @@ extern char *do_get_e2label (const char *device);
 extern int do_set_e2uuid (const char *device, const char *uuid);
 extern char *do_get_e2uuid (const char *device);
 extern int do_fsck (const char *fstype, const char *device);
+extern int do_zero (const char *device);
diff --git a/daemon/stubs.c b/daemon/stubs.c
index 9e0ce559..937913f3 100644
--- a/daemon/stubs.c
+++ b/daemon/stubs.c
@@ -2103,6 +2103,30 @@ done:
   xdr_free ((xdrproc_t) xdr_guestfs_fsck_args, (char *) &args);
 }
 
+static void zero_stub (XDR *xdr_in)
+{
+  int r;
+  struct guestfs_zero_args args;
+  const char *device;
+
+  memset (&args, 0, sizeof args);
+
+  if (!xdr_guestfs_zero_args (xdr_in, &args)) {
+    reply_with_error ("%s: daemon failed to decode procedure arguments", "zero");
+    return;
+  }
+  device = args.device;
+
+  r = do_zero (device);
+  if (r == -1)
+    /* do_zero has already called reply_with_error */
+    goto done;
+
+  reply (NULL, NULL);
+done:
+  xdr_free ((xdrproc_t) xdr_guestfs_zero_args, (char *) &args);
+}
+
 void dispatch_incoming_message (XDR *xdr_in)
 {
   switch (proc_nr) {
@@ -2358,6 +2382,9 @@ void dispatch_incoming_message (XDR *xdr_in)
     case GUESTFS_PROC_FSCK:
       fsck_stub (xdr_in);
       break;
+    case GUESTFS_PROC_ZERO:
+      zero_stub (xdr_in);
+      break;
     default:
       reply_with_error ("dispatch_incoming_message: unknown procedure number %d", proc_nr);
   }
diff --git a/daemon/zero.c b/daemon/zero.c
new file mode 100644
index 00000000..2c20abc3
--- /dev/null
+++ b/daemon/zero.c
@@ -0,0 +1,52 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+int
+do_zero (const char *device)
+{
+  int fd, i;
+  char buf[4096];
+
+  IS_DEVICE (device, -1);
+
+  fd = open (device, O_WRONLY);
+  if (fd == -1) {
+    reply_with_perror ("%s", device);
+    return -1;
+  }
+
+  memset (buf, 0, sizeof buf);
+
+  for (i = 0; i < 32; ++i)
+    (void) write (fd, buf, sizeof buf);
+
+  close (fd);
+
+  return 0;
+}