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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH,v2] xl: randomly generate UUID's
This patch converts xl to randomly generate UUID's rather than using a
dodgy time-seeded PRNG. I have incorporated Cristoph Eggers suggestions
wrt. portability so I would be grateful for an ACK on the NetBSD side of
things. This also folds in the "v2: xl: make libxl_uuid2string internal
to libxenlight" patch since it couldn't be avoided in fixing up xl
printfs() which grok around in the uuid type directly.
I have ignored various suggestions so far on auto-generation of MAC
addresses and left it as a topic for a future patch to solve. In other
words the behaviour stays the same it's just using a true random source.
This will probably conflict horribly with "libxl: autogenerate type
definitions and destructor functions" so if it's acked in principle I
can re-base and re-send on top of that.
Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
diff -r 85bd0f6e8fed tools/libxl/Makefile
--- a/tools/libxl/Makefile Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/Makefile Mon Aug 16 15:39:13 2010 +0100
@@ -16,6 +16,9 @@ CFLAGS += -I. -fPIC
CFLAGS += $(CFLAGS_libxenctrl) $(CFLAGS_libxenguest) $(CFLAGS_libxenstore)
$(CFLAGS_libblktapctl)
LIBS = $(LDLIBS_libxenctrl) $(LDLIBS_libxenguest) $(LDLIBS_libxenstore)
$(LDLIBS_libblktapctl) $(UTIL_LIBS)
+ifeq ($(CONFIG_Linux),y)
+LIBS += -luuid
+endif
LIBXL_OBJS-y = osdeps.o libxl_paths.o libxl_bootloader.o
LIBXL_OBJS = flexarray.o libxl.o libxl_pci.o libxl_dom.o libxl_exec.o
libxl_xshelp.o libxl_device.o libxl_internal.o xenguest.o libxl_utils.o
$(LIBXL_OBJS-y)
diff -r 85bd0f6e8fed tools/libxl/libxl.c
--- a/tools/libxl/libxl.c Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/libxl.c Mon Aug 16 15:39:13 2010 +0100
@@ -90,7 +90,7 @@ int libxl_domain_make(libxl_ctx *ctx, li
xs_transaction_t t;
xen_domain_handle_t handle;
- uuid_string = libxl_uuid2string(ctx, info->uuid);
+ uuid_string = libxl_uuid2string(&gc, info->uuid);
if (!uuid_string) {
libxl_free_all(&gc);
return ERROR_NOMEM;
@@ -102,7 +102,7 @@ int libxl_domain_make(libxl_ctx *ctx, li
*domid = -1;
/* Ultimately, handle is an array of 16 uint8_t, same as uuid */
- memcpy(handle, info->uuid, sizeof(xen_domain_handle_t));
+ libxl_uuid_copy((libxl_uuid *)handle, &info->uuid);
ret = xc_domain_create(ctx->xch, info->ssidref, handle, flags, domid);
if (ret < 0) {
@@ -453,7 +453,7 @@ int libxl_domain_preserve(libxl_ctx *ctx
return ERROR_NOMEM;
}
- uuid_string = libxl_uuid2string(ctx, new_uuid);
+ uuid_string = libxl_uuid2string(&gc, new_uuid);
if (!uuid_string) {
libxl_free_all(&gc);
return ERROR_NOMEM;
@@ -1458,8 +1458,8 @@ static int libxl_create_stubdom(libxl_ct
memset(&c_info, 0x00, sizeof(libxl_domain_create_info));
c_info.hvm = 0;
c_info.name = libxl_sprintf(&gc, "%s-dm", _libxl_domid_to_name(&gc,
info->domid));
- for (i = 0; i < 16; i++)
- c_info.uuid[i] = info->uuid[i];
+
+ libxl_uuid_copy(&c_info.uuid, &info->uuid);
memset(&b_info, 0x00, sizeof(libxl_domain_build_info));
b_info.max_vcpus = 1;
@@ -2785,7 +2785,7 @@ int libxl_set_memory_target(libxl_ctx *c
if (rc != 1 || info.domain != domid)
goto out;
xcinfo2xlinfo(&info, &ptr);
- uuid = libxl_uuid2string(ctx, ptr.uuid);
+ uuid = libxl_uuid2string(&gc, ptr.uuid);
libxl_xs_write(&gc, XBT_NULL, libxl_sprintf(&gc, "/vm/%s/memory", uuid),
"%"PRIu32, target_memkb / 1024);
if (enforce || !domid)
diff -r 85bd0f6e8fed tools/libxl/libxl.h
--- a/tools/libxl/libxl.h Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/libxl.h Mon Aug 16 15:39:13 2010 +0100
@@ -21,8 +21,7 @@
#include <xenctrl.h>
#include <xs.h>
#include <sys/wait.h> /* for pid_t */
-
-typedef uint8_t libxl_uuid[16];
+#include "xl_uuid.h"
typedef uint8_t libxl_mac[6];
@@ -362,7 +361,6 @@ int libxl_run_bootloader(libxl_ctx *ctx,
libxl_device_disk *disk,
uint32_t domid);
-char *libxl_uuid2string(libxl_ctx *ctx, const libxl_uuid uuid);
/* 0 means ERROR_ENOMEM, which we have logged */
/* events handling */
diff -r 85bd0f6e8fed tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/libxl_dom.c Mon Aug 16 15:39:13 2010 +0100
@@ -442,19 +442,12 @@ int save_device_model(libxl_ctx *ctx, ui
return 0;
}
-char *libxl_uuid2string(libxl_ctx *ctx, const libxl_uuid uuid)
+char *libxl_uuid2string(libxl_gc *gc, const libxl_uuid uuid)
{
- libxl_gc gc = LIBXL_INIT_GC(ctx);
- char *s = string_of_uuid(&gc, uuid);
- char *ret;
- if (!s) {
- XL_LOG(ctx, XL_LOG_ERROR, "cannot allocate for uuid");
- ret = NULL;
- }else{
- ret = strdup(s);
- }
- libxl_free_all(&gc);
- return ret;
+ char *s = libxl_sprintf(gc, LIBXL_UUID_FMT, LIBXL_UUID_BYTES(uuid));
+ if (!s)
+ XL_LOG(libxl_gc_owner(gc), XL_LOG_ERROR, "cannot allocate for uuid");
+ return s;
}
static const char *userdata_path(libxl_gc *gc, uint32_t domid,
@@ -472,7 +465,7 @@ static const char *userdata_path(libxl_g
" for domain %"PRIu32, domid);
return NULL;
}
- uuid_string = string_of_uuid(gc, info.uuid);
+ uuid_string = libxl_sprintf(gc, LIBXL_UUID_FMT,
LIBXL_UUID_BYTES(info.uuid));
path = libxl_sprintf(gc, "/var/lib/xen/"
"userdata-%s.%s.%s",
diff -r 85bd0f6e8fed tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/libxl_internal.h Mon Aug 16 15:39:13 2010 +0100
@@ -106,12 +106,6 @@ typedef struct {
#define PRINTF_ATTRIBUTE(x, y) __attribute__((format(printf, x, y)))
-#define UUID_FMT
"%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
-#define string_of_uuid(ctx, u) \
- libxl_sprintf(ctx, UUID_FMT, \
- (u)[0], (u)[1], (u)[2], (u)[3], (u)[4], (u)[5], (u)[6],
(u)[7], \
- (u)[8], (u)[9], (u)[10], (u)[11], (u)[12], (u)[13], (u)[14],
(u)[15])
-
_hidden int xs_writev(struct xs_handle *xsh, xs_transaction_t t, char *dir,
char *kvs[]);
typedef struct {
@@ -249,4 +243,6 @@ _hidden char *libxl_abs_path(libxl_gc *g
_hidden char *_libxl_domid_to_name(libxl_gc *gc, uint32_t domid);
_hidden char *_libxl_poolid_to_name(libxl_gc *gc, uint32_t poolid);
+_hidden char *libxl_uuid2string(libxl_gc *gc, const libxl_uuid uuid);
+
#endif
diff -r 85bd0f6e8fed tools/libxl/xl.c
--- a/tools/libxl/xl.c Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/xl.c Mon Aug 16 15:39:13 2010 +0100
@@ -69,8 +69,6 @@ int main(int argc, char **argv)
exit(1);
}
- srand(time(0));
-
cspec = cmdtable_lookup(cmd);
if (cspec)
ret = cspec->cmd_impl(argc, argv);
diff -r 85bd0f6e8fed tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c Fri Aug 13 13:55:51 2010 +0100
+++ b/tools/libxl/xl_cmdimpl.c Mon Aug 16 15:39:13 2010 +0100
@@ -40,8 +40,6 @@
#include "libxlutil.h"
#include "xl.h"
-#define UUID_FMT
"%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
-
#define CHK_ERRNO( call ) ({ \
int chk_errno = (call); \
if (chk_errno < 0) { \
@@ -265,19 +263,12 @@ static void init_build_info(libxl_domain
}
}
-static void random_uuid(libxl_uuid *uuid)
-{
- int i;
- for (i = 0; i < 16; i++)
- (*uuid)[i] = rand();
-}
-
static void init_dm_info(libxl_device_model_info *dm_info,
libxl_domain_create_info *c_info, libxl_domain_build_info *b_info)
{
memset(dm_info, '\0', sizeof(*dm_info));
- random_uuid(&dm_info->uuid);
+ libxl_uuid_generate(&dm_info->uuid);
dm_info->dom_name = c_info->name;
dm_info->device_model = "qemu-dm";
@@ -304,6 +295,11 @@ static void init_dm_info(libxl_device_mo
static void init_nic_info(libxl_device_nic *nic_info, int devnum)
{
+ const uint8_t *r;
+ libxl_uuid uuid;
+
+ libxl_uuid_generate(&uuid);
+ r = libxl_uuid_bytearray(&uuid);
memset(nic_info, '\0', sizeof(*nic_info));
nic_info->backend_domid = 0;
@@ -314,9 +310,9 @@ static void init_nic_info(libxl_device_n
nic_info->mac[0] = 0x00;
nic_info->mac[1] = 0x16;
nic_info->mac[2] = 0x3e;
- nic_info->mac[3] = 1 + (int) (0x7f * (rand() / (RAND_MAX + 1.0)));
- nic_info->mac[4] = 1 + (int) (0xff * (rand() / (RAND_MAX + 1.0)));
- nic_info->mac[5] = 1 + (int) (0xff * (rand() / (RAND_MAX + 1.0)));
+ nic_info->mac[3] = r[0] & 0x7f;
+ nic_info->mac[4] = r[1];
+ nic_info->mac[5] = r[2];
nic_info->ifname = NULL;
nic_info->bridge = "xenbr0";
CHK_ERRNO( asprintf(&nic_info->script, "%s/vif-bridge",
@@ -326,21 +322,26 @@ static void init_nic_info(libxl_device_n
static void init_net2_info(libxl_device_net2 *net2_info, int devnum)
{
+ const uint8_t *r;
+ libxl_uuid uuid;
+
+ libxl_uuid_generate(&uuid);
+ r = libxl_uuid_bytearray(&uuid);
memset(net2_info, '\0', sizeof(*net2_info));
net2_info->devid = devnum;
net2_info->front_mac[0] = 0x00;
net2_info->front_mac[1] = 0x16;
net2_info->front_mac[2] = 0x3e;;
- net2_info->front_mac[3] = 1 + (int) (0x7f * (rand() / (RAND_MAX + 1.0)));
- net2_info->front_mac[4] = 1 + (int) (0xff * (rand() / (RAND_MAX + 1.0)));
- net2_info->front_mac[5] = 1 + (int) (0xff * (rand() / (RAND_MAX + 1.0)));
+ net2_info->front_mac[3] = 0x7f & r[0];
+ net2_info->front_mac[4] = r[1];
+ net2_info->front_mac[5] = r[2];
net2_info->back_mac[0] = 0x00;
net2_info->back_mac[1] = 0x16;
net2_info->back_mac[2] = 0x3e;
- net2_info->back_mac[3] = 1 + (int) (0x7f * (rand() / (RAND_MAX + 1.0)));
- net2_info->back_mac[4] = 1 + (int) (0xff * (rand() / (RAND_MAX + 1.0)));
- net2_info->back_mac[5] = 1 + (int) (0xff * (rand() / (RAND_MAX + 1.0)));
+ net2_info->back_mac[3] = 0x7f & r[3];
+ net2_info->back_mac[4] = r[4];
+ net2_info->back_mac[5] = r[5];
net2_info->back_trusted = 1;
net2_info->filter_mac = 1;
net2_info->max_bypasses = 5;
@@ -391,11 +392,7 @@ static void printf_info(int domid,
printf("\t(oos %d)\n", c_info->oos);
printf("\t(ssidref %d)\n", c_info->ssidref);
printf("\t(name %s)\n", c_info->name);
- printf("\t(uuid " UUID_FMT ")\n",
- (c_info->uuid)[0], (c_info->uuid)[1], (c_info->uuid)[2],
(c_info->uuid)[3],
- (c_info->uuid)[4], (c_info->uuid)[5], (c_info->uuid)[6],
(c_info->uuid)[7],
- (c_info->uuid)[8], (c_info->uuid)[9], (c_info->uuid)[10],
(c_info->uuid)[11],
- (c_info->uuid)[12], (c_info->uuid)[13], (c_info->uuid)[14],
(c_info->uuid)[15]);
+ printf("\t(uuid " LIBXL_UUID_FMT ")\n", LIBXL_UUID_BYTES(c_info->uuid));
printf("\t(cpupool %s (%d))\n", c_info->poolname, c_info->poolid);
if (c_info->xsdata)
printf("\t(xsdata contains data)\n");
@@ -586,7 +583,7 @@ static void parse_config_data(const char
c_info->name = strdup(buf);
else
c_info->name = "test";
- random_uuid(&c_info->uuid);
+ libxl_uuid_generate(&c_info->uuid);
if (!xlu_cfg_get_long(config, "oos", &l))
c_info->oos = l;
@@ -1181,7 +1178,7 @@ static int preserve_domain(libxl_ctx *ct
return 0;
}
- random_uuid(&new_uuid);
+ libxl_uuid_generate(&new_uuid);
LOG("Preserving domain %d %s with suffix%s", domid, d_config->c_info.name,
stime);
rc = libxl_domain_preserve(ctx, domid, &d_config->c_info, stime, new_uuid);
@@ -2169,10 +2166,8 @@ void list_domains(int verbose, const lib
info[i].dying ? 'd' : '-',
((float)info[i].cpu_time / 1e9));
free(domname);
- if (verbose) {
- char *uuid = libxl_uuid2string(&ctx, info[i].uuid);
- printf(" %s", uuid);
- }
+ if (verbose)
+ printf(" " LIBXL_UUID_FMT, LIBXL_UUID_BYTES(info[i].uuid));
putchar('\n');
}
}
@@ -2192,11 +2187,7 @@ void list_vm(void)
printf("UUID ID name\n");
for (i = 0; i < nb_vm; i++) {
domname = libxl_domid_to_name(&ctx, info[i].domid);
- printf(UUID_FMT " %d %-30s\n",
- info[i].uuid[0], info[i].uuid[1], info[i].uuid[2], info[i].uuid[3],
- info[i].uuid[4], info[i].uuid[5], info[i].uuid[6], info[i].uuid[7],
- info[i].uuid[8], info[i].uuid[9], info[i].uuid[10],
info[i].uuid[11],
- info[i].uuid[12], info[i].uuid[13], info[i].uuid[14],
info[i].uuid[15],
+ printf(LIBXL_UUID_FMT " %d %-30s\n",
LIBXL_UUID_BYTES(info[i].uuid),
info[i].domid, domname);
free(domname);
}
diff -r 85bd0f6e8fed tools/libxl/xl_uuid.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/libxl/xl_uuid.h Mon Aug 16 15:39:13 2010 +0100
@@ -0,0 +1,151 @@
+/* Copyright (c) 2008, XenSource Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of XenSource Inc. nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#ifndef __LIBXL_UUID_H__
+#define __LIBXL_UUID_H__
+
+#define LIBXL_UUID_FMT
"%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
+
+#if defined(__linux__)
+
+#include <uuid/uuid.h>
+
+typedef struct {
+ uuid_t uuid;
+} libxl_uuid;
+
+#define LIBXL_UUID_BYTES(arg) arg.uuid[0], arg.uuid[1], arg.uuid[2],
arg.uuid[3], \
+ arg.uuid[4], arg.uuid[5], arg.uuid[6], arg.uuid[7], \
+ arg.uuid[8], arg.uuid[9], arg.uuid[10], arg.uuid[11], \
+ arg.uuid[12], arg.uuid[13], arg.uuid[14], arg.uuid[15] \
+
+static inline int libxl_uuid_is_nil(libxl_uuid *uuid)
+{
+ return uuid_is_null(uuid->uuid);
+}
+
+static inline void libxl_uuid_generate(libxl_uuid *uuid)
+{
+ uuid_generate(uuid->uuid);
+}
+
+static inline void libxl_uuido_string(libxl_uuid *uuid, char *out, size_t size)
+{
+ uuid_unparse(uuid->uuid, out);
+}
+
+static inline void libxl_uuid_from_string(libxl_uuid *uuid, const char *in)
+{
+ uuid_parse(in, uuid->uuid);
+}
+
+static inline void libxl_uuid_copy(libxl_uuid *dst, libxl_uuid *src)
+{
+ uuid_copy(dst->uuid, src->uuid);
+}
+
+static inline void libxl_uuid_clear(libxl_uuid *uuid)
+{
+ uuid_clear(uuid->uuid);
+}
+
+static inline int libxl_uuid_compare(libxl_uuid *uuid1, libxl_uuid *uuid2)
+{
+ return uuid_compare(uuid1->uuid, uuid2->uuid);
+}
+
+static inline const uint8_t *libxl_uuid_bytearray(libxl_uuid *uuid)
+{
+ return uuid->uuid;
+}
+
+#elif defined(__NetBSD__)
+
+#include <uuid.h>
+#include <string.h>
+#include <stdlib.h>
+
+typedef uuid_t libxl_uuid;
+#define LIBXL_UUID_BYTES(uuid) uuid[0], uuid[1], uuid[2], uuid[3], \
+ uuid[4], uuid[5], uuid[6], uuid[7], \
+ uuid[8], uuid[9], uuid[10], uuid[11], \
+ uuid[12], uuid[13], uuid[14], uuid[15] \
+
+static inline int libxl_uuid_is_nil(libxl_uuid *uuid)
+{
+ uint32_t status;
+ return uuid_is_nil((uuid_t *)uuid, &status);
+}
+
+static inline void libxl_uuid_generate(libxl_uuid *uuid)
+{
+ uint32_t status;
+ uuid_create((uuid_t *)uuid, &status);
+}
+
+static inline void libxl_uuido_string(libxl_uuid *uuid, char *out, size_t size)
+{
+ uint32_t status;
+ char *_out = NULL;
+ uuid_to_string((uuid_t *)uuid, &_out, &status);
+ strlcpy(out, _out, size);
+ free(_out);
+}
+
+static inline void libxl_uuid_from_string(libxl_uuid *uuid, const char *in)
+{
+ uint32_t status;
+ uuid_from_string(in, (uuid_t *)uuid, &status);
+}
+
+static inline void libxl_uuid_copy(libxl_uuid *dst, libxl_uuid *src)
+{
+ memcpy((uuid_t *)dst, (uuid_t *)src, sizeof(uuid_t));
+}
+
+static inline void libxl_uuid_clear(libxl_uuid *uuid)
+{
+ memset((uuid_t *)uuid, 0, sizeof(uuid_t));
+}
+
+static inline int libxl_uuid_compare(libxl_uuid *uuid1, libxl_uuid *uuid2)
+{
+ uint32_t status;
+ return uuid_compare((uuid_t *)uuid1, (uuid_t *)uuid2, &status);
+}
+
+static inline const uint8_t *libxl_uuid_bytearray(libxl_uuid *uuid)
+{
+ return uuid;
+}
+
+#else
+
+#error "Please update libxl_uuid.h for your OS"
+
+#endif
+
+#endif /* __LIBXL_UUID_H__ */
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