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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [PATCH,v7]: xl: randomly generate UUID's
On Thursday 02 September 2010 16:29:06 Gianni Tedesco wrote:
> Changes since v6:
> - Non-constify libxl_uuid_bytearray() so that language bindings can use it
> to set a UUID.
> - Convert ocaml bindings to new API
> - Is this patch cursed or what?
> Changes since v5:
> - There was an error caused due to missing change so the check for bad
> parsing of a "uuid" config option did not lead to error message and exit
> as I had stated in v4 announcement. Phew, sorry for the noise
> Changes since v4:
> - Really fix it for NetBSD? Define our own structure which is a byte
> array. Only use uuid_is_nul and uuid_create which should be safe for
> our portability purposes. Previous attempt at portability wrapper was
> just wrong minded.
> - Remove uuid_to_string since our approach is to use a couple of macros
> for this
> - License under LGPL in line with rest of libxl
> Changes since v3:
> - Fix LIBXL_UUID_BYTES on NetBSD. Note that the code assumes
> uint8_t[16] to always be interchangeable with libxl_uuid_t.
> - Return error messages when uuid_parse fails, spotted by Owen Smith
> - Implement "uuid" parameter in xl and exit with an error if parse
> fails
> Changes since v2:
> - Re-based to remove orthogonal concern of UUID string formatting fixed
> in 22001:0b6f82eaaea9 "xl: make libxl_uuid2string internal to
> libxenlight" - Incorporated Christoph Egger's suggestions
>
> ------8<---------------------------------------------------------------
> This patch converts xl to randomly generate UUID's rather than using a
> dodgy time-seeded PRNG. 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 patch also implements the "uuid" config
> file parameter in xl.
>
> Signed-off-by: Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
Acked-By: Christoph Egger <Christoph.Egger@xxxxxxx>
>
> diff -r 573ddf5cc145 tools/libxl/Makefile
> --- a/tools/libxl/Makefile Tue Aug 31 19:16:23 2010 +0100
> +++ b/tools/libxl/Makefile Thu Sep 02 15:29:01 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
> ifeq ($(LIBXL_BLKTAP),y)
> diff -r 573ddf5cc145 tools/libxl/libxl.c
> --- a/tools/libxl/libxl.c Tue Aug 31 19:16:23 2010 +0100
> +++ b/tools/libxl/libxl.c Thu Sep 02 15:29:01 2010 +0100
> @@ -131,7 +131,7 @@ 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) {
> @@ -1506,8 +1506,8 @@ 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;
> diff -r 573ddf5cc145 tools/libxl/libxl.h
> --- a/tools/libxl/libxl.h Tue Aug 31 19:16:23 2010 +0100
> +++ b/tools/libxl/libxl.h Thu Sep 02 15:29:01 2010 +0100
> @@ -131,13 +131,7 @@
> #include <xs.h>
> #include <sys/wait.h> /* for pid_t */
>
> -typedef uint8_t libxl_uuid[16];
> -#define LIBXL_UUID_FMT
> "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02h
>hx%02hhx%02hhx%02hhx%02hhx" -#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] \
> -
> +#include "libxl_uuid.h"
>
> typedef uint8_t libxl_mac[6];
>
> diff -r 573ddf5cc145 tools/libxl/libxl_uuid.h
> --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> +++ b/tools/libxl/libxl_uuid.h Thu Sep 02 15:29:01 2010 +0100
> @@ -0,0 +1,134 @@
> +/*
> + * Copyright (C) 2008,2010 Citrix Ltd.
> + *
> + * This program 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; version 2.1 only. with the
> special + * exception on linking described in file LICENSE.
> + *
> + * 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 Lesser General Public License for more details.
> + */
> +
> +#ifndef __LIBXL_UUID_H__
> +#define __LIBXL_UUID_H__
> +
> +#define LIBXL_UUID_FMT
> "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02h
>hx%02hhx%02hhx%02hhx%02hhx" +#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] +
> +#if defined(__linux__)
> +
> +#include <uuid/uuid.h>
> +
> +typedef struct {
> + uuid_t uuid;
> +} libxl_uuid;
> +
> +#define LIBXL_UUID_BYTES(arg) LIBXL__UUID_BYTES(((uint8_t *)arg.uuid))
> +
> +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 int libxl_uuid_from_string(libxl_uuid *uuid, const char *in)
> +{
> + return 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 uint8_t *libxl_uuid_bytearray(libxl_uuid *uuid)
> +{
> + return uuid->uuid;
> +}
> +
> +#elif defined(__NetBSD__)
> +
> +#include <uuid.h>
> +#include <string.h>
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <assert.h>
> +
> +#define LIBXL_UUID_BYTES(arg) LIBXL__UUID_BYTES(arg.uuid)
> +
> +typedef struct {
> + uint8_t uuid[16];
> +} libxl_uuid;
> +
> +static inline int libxl_uuid_is_nil(libxl_uuid *uuid)
> +{
> + uint32_t status;
> + return uuid_is_nil((uuid_t *)uuid->uuid, &status);
> +}
> +
> +static inline void libxl_uuid_generate(libxl_uuid *uuid)
> +{
> + uint32_t status;
> + uuid_create((uuid_t *)uuid->uuid, &status);
> + assert(status == uuid_s_ok);
> +}
> +
> +#define LIBXL__UUID_PTRS(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_from_string(libxl_uuid *uuid, const char *in)
> +{
> + if ( sscanf(in, LIBXL_UUID_FMT, LIBXL__UUID_PTRS(uuid->uuid)) !=
> sizeof(uuid->uuid) ) + return -1;
> + return 0;
> +}
> +#undef LIBXL__UUID_PTRS
> +
> +static inline void libxl_uuid_copy(libxl_uuid *dst, libxl_uuid *src)
> +{
> + memcpy(dst->uuid, src->uuid, sizeof(dst->uuid));
> +}
> +
> +static inline void libxl_uuid_clear(libxl_uuid *uuid)
> +{
> + memset(uuid->uuid, 0, sizeof(uuid->uuid));
> +}
> +
> +static inline int libxl_uuid_compare(libxl_uuid *uuid1, libxl_uuid *uuid2)
> +{
> + return memcmp(uuid1->uuid, uuid2->uuid, sizeof(uuid1->uuid));
> +}
> +
> +static inline uint8_t *libxl_uuid_bytearray(libxl_uuid *uuid)
> +{
> + return uuid->uuid;
> +}
> +
> +#else
> +
> +#error "Please update libxl_uuid.h for your OS"
> +
> +#endif
> +
> +#endif /* __LIBXL_UUID_H__ */
> diff -r 573ddf5cc145 tools/libxl/xl.c
> --- a/tools/libxl/xl.c Tue Aug 31 19:16:23 2010 +0100
> +++ b/tools/libxl/xl.c Thu Sep 02 15:29:01 2010 +0100
> @@ -74,8 +74,6 @@ int main(int argc, char **argv)
> argc -= optind;
> optind = 1;
>
> - srand(time(0));
> -
> cspec = cmdtable_lookup(cmd);
> if (cspec)
> ret = cspec->cmd_impl(argc, argv);
> diff -r 573ddf5cc145 tools/libxl/xl_cmdimpl.c
> --- a/tools/libxl/xl_cmdimpl.c Tue Aug 31 19:16:23 2010 +0100
> +++ b/tools/libxl/xl_cmdimpl.c Thu Sep 02 15:29:01 2010 +0100
> @@ -286,19 +286,12 @@ 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";
> @@ -325,6 +318,11 @@ 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;
> @@ -335,9 +333,9 @@ 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 = strdup("xenbr0");
> CHK_ERRNO( asprintf(&nic_info->script, "%s/vif-bridge",
> @@ -347,21 +345,26 @@ 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;
> @@ -604,8 +607,16 @@ static void parse_config_data(const char
> c_info->name = strdup(buf);
> else
> c_info->name = "test";
> - random_uuid(&c_info->uuid);
> -
> +
> + if (!xlu_cfg_get_string (config, "uuid", &buf) ) {
> + if ( libxl_uuid_from_string(&c_info->uuid, buf) ) {
> + fprintf(stderr, "Failed to parse UUID: %s\n", buf);
> + exit(1);
> + }
> + }else{
> + libxl_uuid_generate(&c_info->uuid);
> + }
> +
> if (!xlu_cfg_get_long(config, "oos", &l))
> c_info->oos = l;
>
> @@ -1206,7 +1217,7 @@ 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); diff -r 573ddf5cc145
> tools/ocaml/libs/xl/xl_stubs.c
> --- a/tools/ocaml/libs/xl/xl_stubs.c Tue Aug 31 19:16:23 2010 +0100
> +++ b/tools/ocaml/libs/xl/xl_stubs.c Thu Sep 02 15:29:01 2010 +0100
> @@ -131,6 +131,7 @@ static int domain_create_info_val (caml_
> {
> CAMLparam1(v);
> CAMLlocal1(a);
> + uint8_t *uuid = libxl_uuid_bytearray(&c_val->uuid);
> int i;
>
> c_val->hvm = Bool_val(Field(v, 0));
> @@ -140,7 +141,7 @@ static int domain_create_info_val (caml_
> c_val->name = dup_String_val(gc, Field(v, 4));
> a = Field(v, 5);
> for (i = 0; i < 16; i++)
> - c_val->uuid[i] = Int_val(Field(a, i));
> + uuid[i] = Int_val(Field(a, i));
> string_string_tuple_array_val(gc, &(c_val->xsdata), Field(v, 6));
> string_string_tuple_array_val(gc, &(c_val->platformdata), Field(v,
> 7));
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