[PATCH] Time-based RFC 4122 UUID generator - Kernel

This is a discussion on [PATCH] Time-based RFC 4122 UUID generator - Kernel ; On Monday 10 December 2007, Theodore Tso wrote: > On Tue, Nov 20, 2007 at 06:00:12PM -0500, Theodore Tso wrote: > > Basically, the only way to solve this problem 100% in userspace would > > be with a userspace ...

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Thread: [PATCH] Time-based RFC 4122 UUID generator

  1. Re: [e2fsprogs PATCH] Userspace solution to time-based UUID without duplicates

    On Monday 10 December 2007, Theodore Tso wrote:
    > On Tue, Nov 20, 2007 at 06:00:12PM -0500, Theodore Tso wrote:
    > > Basically, the only way to solve this problem 100% in userspace would
    > > be with a userspace daemon running as a privileged user, and some kind
    > > of Unix domain socket.
    > >
    > > Patches to implement this in the e2fsprogs UUID library would be
    > > greatfully accepted.

    >
    > This patch creates a userspace uuidd which correctly generates
    > time-based (version 1) UUID's, with the clock sequence number stored
    > in the filesystem so we correctly detect time going backwards across
    > processes and even across reboots.
    >
    > I believe this patch is a better solution than Helge's kernel patch
    > solution or the kludgy patch to e2fsprogs in the the SLES RPM which
    > tries to solve this problem in another way, but which has been
    > problematic in the past.
    >
    > Helge, could you try this out and see if it meets your needs?
    >
    > (Ted's patch to e2fsprogs removed here)


    FYI, we are currently discussing and testing this proposed patch to e2fsprogs off-list in Red Hat's bugzilla:
    https://bugzilla.redhat.com/show_bug.cgi?id=233471

    Helge
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  2. Re: [e2fsprogs PATCH] Userspace solution to time-based UUID without duplicates

    On Sun, Dec 16, 2007 at 10:53:19PM +0100, Helge Deller wrote:
    >
    > FYI, we are currently discussing and testing this proposed patch to e2fsprogs off-list in Red Hat's bugzilla:
    > https://bugzilla.redhat.com/show_bug.cgi?id=233471


    Note that this bug is currently not publically visible. (You need to
    be various Red Hat Beta groups in order to view it)

    In any case here's the latest version of the libuuid patch, in case
    anyone would like to comment. I believe this to be a more correct way
    of solving this problem than the uuid kernel patch, since it does the
    right thing even if time goes backwards across a reboot. And, of
    course, it doesn't consume one or two kilobytes of non-swappable
    kernel memory. In this version, the uuidd daemon is optional (it's
    mainly useful if you are running some application that requires
    hundreds or thousands of UUID's generated per second[1]), and if it's
    installed, the libuuid library to start the setuid helper uuidd daemon
    when it is needed, and after five minutes of inactivity, the uuidd
    daemon will automatically exit, thus conserving memory.

    [1] This is not a hypothetical example; it was such an enterprise
    application that spawned the Sourceforge, Red Hat, and Novell bug
    reports.

    - Ted

    commit 740837def7fc55ba6b0368f46a4b4abcaba0becd
    Author: Theodore Ts'o
    Date: Sun Dec 16 17:21:38 2007 -0500

    Add uuidd daemon to prevent duplicate time-based UUID's

    Also store the clock sequence information in a state file in
    /var/lib/misc/uuid-clock so that if the time goes backwards the clock
    sequence counter can get bumped. This allows us to completely
    correctly generate time-based (version 1) UUID's according to the
    algorithm specified RFC 4122.

    Addresses-Sourceforge-Bug: #1529672
    Addresses-Red-Hat-Bugzilla: #233471

    Signed-off-by: "Theodore Ts'o"

    diff --git a/aclocal.m4 b/aclocal.m4
    index 3a4c2f3..fc3ed73 100644
    --- a/aclocal.m4
    +++ b/aclocal.m4
    @@ -2600,3 +2600,52 @@ AC_DEFUN([gl_XSIZE],
    AC_REQUIRE([gl_SIZE_MAX])
    AC_CHECK_HEADERS(stdint.h)
    ])
    +
    +# from http://autoconf-archive.cryp.to/ax_tls.html
    +#
    +# This was licensed under the GPL with the following exception:
    +#
    +# As a special exception, the respective Autoconf Macro's copyright
    +# owner gives unlimited permission to copy, distribute and modify the
    +# configure scripts that are the output of Autoconf when processing
    +# the Macro. You need not follow the terms of the GNU General Public
    +# License when using or distributing such scripts, even though
    +# portions of the text of the Macro appear in them. The GNU General
    +# Public License (GPL) does govern all other use of the material that
    +# constitutes the Autoconf Macro.
    +#
    +# This special exception to the GPL applies to versions of the
    +# Autoconf Macro released by the Autoconf Macro Archive. When you make
    +# and distribute a modified version of the Autoconf Macro, you may
    +# extend this special exception to the GPL to apply to your modified
    +# version as well.
    +#
    +AC_DEFUN([AX_TLS], [
    + AC_MSG_CHECKING(for thread local storage (TLS) class)
    + AC_CACHE_VAL(ac_cv_tls, [
    + ax_tls_keywords="__thread __declspec(thread) none"
    + for ax_tls_keyword in $ax_tls_keywords; do
    + case $ax_tls_keyword in
    + none) ac_cv_tls=none ; break ;;
    + *)
    + AC_TRY_COMPILE(
    + [#include
    + static void
    + foo(void) {
    + static ] $ax_tls_keyword [ int bar;
    + exit(1);
    + }],
    + [],
    + [ac_cv_tls=$ax_tls_keyword ; break],
    + ac_cv_tls=none
    + )
    + esac
    + done
    +])
    +
    + if test "$ac_cv_tls" != "none"; then
    + dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
    + AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
    + fi
    + AC_MSG_RESULT($ac_cv_tls)
    +])
    diff --git a/configure b/configure
    index 5c8448a..244a509 100755
    --- a/configure
    +++ b/configure
    @@ -11434,6 +11434,81 @@ done

    fi

    + { echo "$as_me:$LINENO: checking for thread local storage (TLS) class" >&5
    +echo $ECHO_N "checking for thread local storage (TLS) class... $ECHO_C" >&6; }
    + if test "${ac_cv_tls+set}" = set; then
    + echo $ECHO_N "(cached) $ECHO_C" >&6
    +else
    +
    + ax_tls_keywords="__thread __declspec(thread) none"
    + for ax_tls_keyword in $ax_tls_keywords; do
    + case $ax_tls_keyword in
    + none) ac_cv_tls=none ; break ;;
    + *)
    + cat >conftest.$ac_ext <<_ACEOF
    +/* confdefs.h. */
    +_ACEOF
    +cat confdefs.h >>conftest.$ac_ext
    +cat >>conftest.$ac_ext <<_ACEOF
    +/* end confdefs.h. */
    +#include
    + static void
    + foo(void) {
    + static $ax_tls_keyword int bar;
    + exit(1);
    + }
    +int
    +main ()
    +{
    +
    + ;
    + return 0;
    +}
    +_ACEOF
    +rm -f conftest.$ac_objext
    +if { (ac_try="$ac_compile"
    +case "(($ac_try" in
    + *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
    + *) ac_try_echo=$ac_try;;
    +esac
    +eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
    + (eval "$ac_compile") 2>conftest.er1
    + ac_status=$?
    + grep -v '^ *+' conftest.er1 >conftest.err
    + rm -f conftest.er1
    + cat conftest.err >&5
    + echo "$as_me:$LINENO: \$? = $ac_status" >&5
    + (exit $ac_status); } && {
    + test -z "$ac_c_werror_flag" ||
    + test ! -s conftest.err
    + } && test -s conftest.$ac_objext; then
    + ac_cv_tls=$ax_tls_keyword ; break
    +else
    + echo "$as_me: failed program was:" >&5
    +sed 's/^/| /' conftest.$ac_ext >&5
    +
    + ac_cv_tls=none
    +
    +fi
    +
    +rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
    + esac
    + done
    +
    +fi
    +
    +
    + if test "$ac_cv_tls" != "none"; then
    +
    +cat >>confdefs.h <<_ACEOF
    +#define TLS $ac_cv_tls
    +_ACEOF
    +
    + fi
    + { echo "$as_me:$LINENO: result: $ac_cv_tls" >&5
    +echo "${ECHO_T}$ac_cv_tls" >&6; }
    +
    +



    @@ -14518,7 +14593,9 @@ fi



    -for ac_func in chflags getrusage llseek lseek64 open64 fstat64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime
    +
    +
    +for ac_func in chflags getrusage llseek lseek64 open64 fstat64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid
    do
    as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
    { echo "$as_me:$LINENO: checking for $ac_func" >&5
    diff --git a/configure.in b/configure.in
    index 011df1a..061fbcf 100644
    --- a/configure.in
    +++ b/configure.in
    @@ -570,6 +570,7 @@ if test $cross_compiling = no; then
    else
    AC_CHECK_PROGS(BUILD_CC, gcc cc)
    fi
    +AX_TLS
    AC_CHECK_HEADERS(stdlib.h unistd.h stdarg.h stdint.h errno.h malloc.h mntent.h paths.h dirent.h getopt.h setjmp.h signal.h termios.h linux/fd.h linux/major.h sys/disklabel.h sys/ioctl.h sys/mman.h sys/mkdev.h sys/prctl.h sys/queue.h sys/sockio.h sys/socket.h sys/sysmacros.h sys/time.h sys/stat.h sys/types.h sys/wait.h sys/resource.h net/if_dl.h netinet/in.h utime.h)
    AC_CHECK_HEADERS(sys/disk.h sys/mount.h,,,
    [[
    @@ -676,7 +677,7 @@ AC_CHECK_MEMBER(struct sockaddr.sa_len,
    [#include
    #include ])
    dnl
    -AC_CHECK_FUNCS(chflags getrusage llseek lseek64 open64 fstat64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime)
    +AC_CHECK_FUNCS(chflags getrusage llseek lseek64 open64 fstat64 getmntinfo strtoull strcasecmp srandom jrand48 fchown mallinfo fdatasync strnlen strptime strdup sysconf pathconf posix_memalign memalign valloc __secure_getenv prctl mmap utime setresuid setresgid)
    dnl
    dnl Check to see if -lsocket is required (solaris) to make something
    dnl that uses socket() to compile; this is needed for the UUID library
    diff --git a/debian/changelog b/debian/changelog
    index 737242a..04a068b 100644
    --- a/debian/changelog
    +++ b/debian/changelog
    @@ -1,3 +1,9 @@
    +e2fsprogs (1.40.3-2) unstable; urgency=low
    +
    + * Add uuidd daemon
    +
    + -- Theodore Y. Ts'o Sun, 09 Dec 2007 22:47:53 -0500
    +
    e2fsprogs (1.40.3-1) unstable; urgency=medium

    * New upstream release
    diff --git a/debian/control b/debian/control
    index 0bf778a..612c4ca 100644
    --- a/debian/control
    +++ b/debian/control
    @@ -78,12 +78,26 @@ Package: libuuid1
    Section: libs
    Priority: required
    Depends: ${shlibsepends}
    +Recommends: uuid-runtime
    Replaces: e2fsprogs (<< 1.34-1)
    Architecture: any
    Description: universally unique id library
    libuuid generates and parses 128-bit universally unique id's (UUID's).
    See RFC 4122 for more information.

    +Package: uuid-runtime
    +Section: libs
    +Priority: optional
    +Depends: ${shlibsepends}
    +Replaces: e2fsprogs (<= 1.40.3-1ubuntu1)
    +Architecture: any
    +Description: universally unique id library
    + libuuid generates and parses 128-bit universally unique id's (UUID's).
    + See RFC 4122 for more information.
    + .
    + This package contains the uuidd daemon which is used by libuuid as well as
    + the uuidgen program.
    +
    Package: libuuid1-udeb
    Section: debian-installer
    Priority: optional
    diff --git a/debian/libuuid1.postinst b/debian/libuuid1.postinst
    new file mode 100644
    index 0000000..8559ffc
    --- /dev/null
    +++ b/debian/libuuid1.postinst
    @@ -0,0 +1,8 @@
    +#!/bin/sh
    +
    +adduser --system --group --no-create-home --disabled-login \
    + --quiet --home /var/lib/libuuid libuuid
    +mkdir -p /var/lib/libuuid
    +chown libuuid:libuuid /var/lib/libuuid
    +chmod 2775 /var/lib/libuuid
    +
    diff --git a/debian/libuuid1.postrm b/debian/libuuid1.postrm
    new file mode 100644
    index 0000000..63d8370
    --- /dev/null
    +++ b/debian/libuuid1.postrm
    @@ -0,0 +1,6 @@
    +#!/bin/sh
    +set -e
    +if [ "$1" = purge ]
    +then
    + rm -rf /var/lib/libuuid
    +fi
    diff --git a/debian/rules b/debian/rules
    index 3e10091..b66555a 100755
    --- a/debian/rules
    +++ b/debian/rules
    @@ -359,7 +359,7 @@ binary-arch: install install-udeb
    DH_OPTIONS= dh_installchangelogs -pe2fsprogs \
    -plibblkid${BLKID_SOVERSION} -plibcomerr${COMERR_SOVERSION} \
    -plibss${SS_SOVERSION} -plibuuid${UUID_SOVERSION} \
    - -pe2fslibs -puuid-dev -pe2fsck-static
    + -pe2fslibs -puuid-dev -puuid-runtime -pe2fsck-static

    dh_fixperms
    ifneq ($(ismips),)
    diff --git a/debian/uuid-runtime.copyright b/debian/uuid-runtime.copyright
    new file mode 100644
    index 0000000..afcd4c5
    --- /dev/null
    +++ b/debian/uuid-runtime.copyright
    @@ -0,0 +1,39 @@
    +This package was added to the e2fsprogs debian source package by
    +Theodore Ts'o on Fri Dec 14 22:24:35 EST 2007
    +
    +It is part of the main e2fsprogs distribution, which can be found at:
    +
    + http://sourceforge.net/projects/e2fsprogs
    +
    +Upstream Author: Theodore Ts'o
    +
    +Copyright:
    +
    +Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by
    +Theodore Ts'o
    +
    +Redistribution and use in source and binary forms, with or without
    +modification, are permitted provided that the following conditions
    +are met:
    +1. Redistributions of source code must retain the above copyright
    + notice, and the entire permission notice in its entirety,
    + including the disclaimer of warranties.
    +2. 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.
    +3. The name of the author may not be used to endorse or promote
    + products derived from this software without specific prior
    + written permission.
    +
    +THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
    +WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    +OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
    +WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
    +DAMAGE.
    diff --git a/debian/uuid-runtime.files b/debian/uuid-runtime.files
    new file mode 100644
    index 0000000..ff8d87a
    --- /dev/null
    +++ b/debian/uuid-runtime.files
    @@ -0,0 +1,4 @@
    +usr/bin/uuidgen
    +usr/sbin/uuidd
    +usr/share/man/man8/uuidd.*
    +usr/share/man/man1/uuidgen.*
    diff --git a/debian/uuid-runtime.postinst b/debian/uuid-runtime.postinst
    new file mode 100644
    index 0000000..4ab013a
    --- /dev/null
    +++ b/debian/uuid-runtime.postinst
    @@ -0,0 +1,9 @@
    +#!/bin/sh
    +
    +adduser --system --group --no-create-home --disabled-login \
    + --quiet --home /var/lib/libuuid libuuid
    +mkdir -p /var/run/uuidd
    +chown libuuid:libuuid /var/run/uuidd
    +chmod 775 /var/run/uuidd
    +chown libuuid:libuuid /usr/sbin/uuidd
    +chmod 6755 /usr/sbin/uuidd
    diff --git a/debian/uuid-runtime.postrm b/debian/uuid-runtime.postrm
    new file mode 100644
    index 0000000..62b1c7d
    --- /dev/null
    +++ b/debian/uuid-runtime.postrm
    @@ -0,0 +1,7 @@
    +#!/bin/sh
    +set -e
    +if [ "$1" = purge ]
    +then
    + rm -rf /var/run/uuidd
    +fi
    +
    diff --git a/debian/uuid-runtime.prerm b/debian/uuid-runtime.prerm
    new file mode 100644
    index 0000000..3788432
    --- /dev/null
    +++ b/debian/uuid-runtime.prerm
    @@ -0,0 +1,6 @@
    +#! /bin/sh
    +
    +if [ -x /usr/sbin/uuidd ]
    +then
    + /usr/sbin/uuidd -k || true
    +fi
    diff --git a/debian/uuid-runtime.shlibs.local b/debian/uuid-runtime.shlibs.local
    new file mode 100644
    index 0000000..5d97674
    --- /dev/null
    +++ b/debian/uuid-runtime.shlibs.local
    @@ -0,0 +1 @@
    +libuuid 1 libuuid1 (> 1.40.3-1)
    diff --git a/lib/uuid/gen_uuid.c b/lib/uuid/gen_uuid.c
    index 61f2805..a84ae1c 100644
    --- a/lib/uuid/gen_uuid.c
    +++ b/lib/uuid/gen_uuid.c
    @@ -38,6 +38,7 @@
    */
    #define _SVID_SOURCE

    +#include
    #ifdef HAVE_UNISTD_H
    #include
    #endif
    @@ -57,6 +58,7 @@
    #ifdef HAVE_SYS_SOCKET_H
    #include
    #endif
    +#include
    #ifdef HAVE_SYS_SOCKIO_H
    #include
    #endif
    @@ -74,15 +76,22 @@
    #endif

    #include "uuidP.h"
    +#include "uuidd.h"

    #ifdef HAVE_SRANDOM
    #define srand(x) srandom(x)
    #define rand() random()
    #endif

    +#ifdef TLS
    +#define THREAD_LOCAL static TLS
    +#else
    +#define THREAD_LOCAL static
    +#endif
    +
    #if defined(__linux__) && defined(__NR_gettid) && defined(HAVE_JRAND48)
    #define DO_JRAND_MIX
    -static unsigned short jrand_seed[3];
    +THREAD_LOCAL unsigned short jrand_seed[3];
    #endif

    static int get_random_fd(void)
    @@ -247,22 +256,62 @@ static int get_node_id(unsigned char *node_id)
    /* Assume that the gettimeofday() has microsecond granularity */
    #define MAX_ADJUSTMENT 10

    -static int get_clock(uint32_t *clock_high, uint32_t *clock_low, uint16_t *ret_clock_seq)
    +static int get_clock(uint32_t *clock_high, uint32_t *clock_low,
    + uint16_t *ret_clock_seq, int *num)
    {
    - static int adjustment = 0;
    - static struct timeval last = {0, 0};
    - static uint16_t clock_seq;
    + THREAD_LOCAL int adjustment = 0;
    + THREAD_LOCAL struct timeval last = {0, 0};
    + THREAD_LOCAL int state_fd = -2;
    + THREAD_LOCAL FILE *state_f;
    + THREAD_LOCAL uint16_t clock_seq;
    struct timeval tv;
    unsigned long long clock_reg;
    -
    -try_again:
    - gettimeofday(&tv, 0);
    + mode_t save_umask;
    +
    + if (state_fd == -2) {
    + save_umask = umask(0);
    + state_fd = open("/var/lib/libuuid/clock.txt",
    + O_RDWR|O_CREAT, 0660);
    + (void) umask(save_umask);
    + state_f = fdopen(state_fd, "r+");
    + if (!state_f) {
    + close(state_fd);
    + state_fd = -1;
    + }
    + }
    + if (state_fd >= 0) {
    + rewind(state_f);
    + while (lockf(state_fd, F_LOCK, 0) < 0) {
    + if ((errno == EAGAIN) || (errno == EINTR))
    + continue;
    + fclose(state_f);
    + close(state_fd);
    + state_fd = -1;
    + }
    + }
    + if (state_fd >= 0) {
    + unsigned int cl;
    + unsigned long tv1, tv2;
    + int a;
    +
    + if (fscanf(state_f, "clock: %04x tv: %lu %lu adj: %d\n",
    + &cl, &tv1, &tv2, &a) == 4) {
    + clock_seq = cl & 0x3FFF;
    + last.tv_sec = tv1;
    + last.tv_usec = tv2;
    + adjustment = a;
    + }
    + }
    +
    if ((last.tv_sec == 0) && (last.tv_usec == 0)) {
    get_random_bytes(&clock_seq, sizeof(clock_seq));
    clock_seq &= 0x3FFF;
    last = tv;
    last.tv_sec--;
    }
    +
    +try_again:
    + gettimeofday(&tv, 0);
    if ((tv.tv_sec < last.tv_sec) ||
    ((tv.tv_sec == last.tv_sec) &&
    (tv.tv_usec < last.tv_usec))) {
    @@ -283,13 +332,124 @@ try_again:
    clock_reg += ((unsigned long long) tv.tv_sec)*10000000;
    clock_reg += (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;

    + if (num && (*num > 1)) {
    + adjustment += *num - 1;
    + last.tv_usec += adjustment / 10;
    + adjustment = adjustment % 10;
    + last.tv_sec += last.tv_usec / 1000000;
    + last.tv_usec = last.tv_usec % 1000000;
    + }
    +
    + if (state_fd > 0) {
    + rewind(state_f);
    + ftruncate(state_fd, 0);
    + fprintf(state_f, "clock: %04x tv: %lu %lu adj: %d\n",
    + clock_seq, last.tv_sec, last.tv_usec, adjustment);
    + fflush(state_f);
    + rewind(state_f);
    + lockf(state_fd, F_ULOCK, 0);
    + }
    +
    *clock_high = clock_reg >> 32;
    *clock_low = clock_reg;
    *ret_clock_seq = clock_seq;
    return 0;
    }

    -void uuid_generate_time(uuid_t out)
    +static ssize_t read_all(int fd, char *buf, size_t count)
    +{
    + ssize_t ret;
    + ssize_t c = 0;
    +
    + memset(buf, 0, count);
    + while (count > 0) {
    + ret = read(fd, buf, count);
    + if (ret < 0) {
    + if ((errno == EAGAIN) || (errno == EINTR))
    + continue;
    + return -1;
    + }
    + count -= ret;
    + buf += ret;
    + c += ret;
    + }
    + return c;
    +}
    +
    +
    +/*
    + * Try using the uuidd daemon to generate the UUID
    + *
    + * Returns 0 on success, non-zero on failure.
    + */
    +static int get_uuid_via_daemon(int op, uuid_t out, int *num)
    +{
    + char op_buf[64];
    + int op_len;
    + int s;
    + ssize_t ret;
    + int32_t reply_len = 0, expected = 16;
    + struct sockaddr_un srv_addr;
    + static const char *uuidd_path = UUIDD_PATH;
    + static int access_ret = -2;
    +
    + if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
    + return -1;
    +
    + srv_addr.sun_family = AF_UNIX;
    + strcpy(srv_addr.sun_path, UUIDD_SOCKET_PATH);
    +
    + if (connect(s, (const struct sockaddr *) &srv_addr,
    + sizeof(struct sockaddr_un)) < 0) {
    + if (access_ret == -2)
    + access_ret = access(uuidd_path, X_OK);
    + if (access_ret == 0) {
    + if (fork() == 0) {
    + execl(uuidd_path, "uuidd", "-qT", "300", 0);
    + exit(1);
    + }
    + usleep(500);
    + if (connect(s, (const struct sockaddr *) &srv_addr,
    + sizeof(struct sockaddr_un)) < 0)
    + goto fail;
    + } else
    + goto fail;
    + }
    + op_buf[0] = op;
    + op_len = 1;
    + if (op == UUIDD_OP_BULK_TIME_UUID) {
    + memcpy(op_buf+1, num, sizeof(num));
    + op_len += sizeof(num);
    + expected += sizeof(num);
    + }
    +
    + ret = write(s, op_buf, op_len);
    + if (ret < 1)
    + goto fail;
    +
    + ret = read_all(s, (char *) &reply_len, sizeof(reply_len));
    + if (ret < 0)
    + goto fail;
    +
    + if (reply_len != expected)
    + goto fail;
    +
    + ret = read_all(s, op_buf, reply_len);
    +
    + if (op == UUIDD_OP_BULK_TIME_UUID)
    + memcpy(op_buf+16, num, sizeof(int));
    +
    + memcpy(out, op_buf, 16);
    +
    + close(s);
    + return ((ret == expected) ? 0 : -1);
    +
    +fail:
    + close(s);
    + return -1;
    +}
    +
    +void uuid__generate_time(uuid_t out, int *num)
    {
    static unsigned char node_id[6];
    static int has_init = 0;
    @@ -308,7 +468,7 @@ void uuid_generate_time(uuid_t out)
    }
    has_init = 1;
    }
    - get_clock(&clock_mid, &uu.time_low, &uu.clock_seq);
    + get_clock(&clock_mid, &uu.time_low, &uu.clock_seq, num);
    uu.clock_seq |= 0x8000;
    uu.time_mid = (uint16_t) clock_mid;
    uu.time_hi_and_version = ((clock_mid >> 16) & 0x0FFF) | 0x1000;
    @@ -316,19 +476,82 @@ void uuid_generate_time(uuid_t out)
    uuid_pack(&uu, out);
    }

    -void uuid_generate_random(uuid_t out)
    +void uuid_generate_time(uuid_t out)
    +{
    +#ifdef TLS
    + THREAD_LOCAL int num = 0;
    + THREAD_LOCAL struct uuid uu;
    + THREAD_LOCAL time_t last_time = 0;
    + time_t now;
    +
    + if (num > 0) {
    + now = time(0);
    + if (now > last_time+1)
    + num = 0;
    + }
    + if (num <= 0) {
    + num = 1000;
    + if (get_uuid_via_daemon(UUIDD_OP_BULK_TIME_UUID,
    + out, &num) == 0) {
    + last_time = time(0);
    + uuid_unpack(out, &uu);
    + num--;
    + return;
    + }
    + num = 0;
    + }
    + if (num > 0) {
    + uu.time_low++;
    + if (uu.time_low == 0) {
    + uu.time_mid++;
    + if (uu.time_mid == 0)
    + uu.time_hi_and_version++;
    + }
    + num--;
    + uuid_pack(&uu, out);
    + return;
    + }
    +#else
    + if (get_uuid_via_daemon(UUIDD_OP_TIME_UUID, out, 0) == 0)
    + return;
    +#endif
    +
    + uuid__generate_time(out, 0);
    +}
    +
    +
    +void uuid__generate_random(uuid_t out, int *num)
    {
    uuid_t buf;
    struct uuid uu;
    + int i, n;

    - get_random_bytes(buf, sizeof(buf));
    - uuid_unpack(buf, &uu);
    + if (!num || !*num)
    + n = 1;
    + else
    + n = *num;

    - uu.clock_seq = (uu.clock_seq & 0x3FFF) | 0x8000;
    - uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
    - uuid_pack(&uu, out);
    + for (i = 0; i < n; i++) {
    + get_random_bytes(buf, sizeof(buf));
    + uuid_unpack(buf, &uu);
    +
    + uu.clock_seq = (uu.clock_seq & 0x3FFF) | 0x8000;
    + uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF)
    + | 0x4000;
    + uuid_pack(&uu, out);
    + out += sizeof(uuid_t);
    + }
    }

    +void uuid_generate_random(uuid_t out)
    +{
    + int num = 1;
    + /* No real reason to use the daemon for random uuid's -- yet */
    +
    + uuid__generate_random(out, &num);
    +}
    +
    +
    /*
    * This is the generic front-end to uuid_generate_random and
    * uuid_generate_time. It uses uuid_generate_random only if
    diff --git a/lib/uuid/uuidd.h b/lib/uuid/uuidd.h
    new file mode 100644
    index 0000000..c807236
    --- /dev/null
    +++ b/lib/uuid/uuidd.h
    @@ -0,0 +1,53 @@
    +/*
    + * Definitions used by the uuidd daemon
    + *
    + * Copyright (C) 2007 Theodore Ts'o.
    + *
    + * %Begin-Header%
    + * Redistribution and use in source and binary forms, with or without
    + * modification, are permitted provided that the following conditions
    + * are met:
    + * 1. Redistributions of source code must retain the above copyright
    + * notice, and the entire permission notice in its entirety,
    + * including the disclaimer of warranties.
    + * 2. 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.
    + * 3. The name of the author may not be used to endorse or promote
    + * products derived from this software without specific prior
    + * written permission.
    + *
    + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
    + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
    + * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
    + * DAMAGE.
    + * %End-Header%
    + */
    +
    +#ifndef _UUID_UUIDD_H
    +#define _UUID_UUIDD_H
    +
    +#define UUIDD_SOCKET_PATH "/var/run/uuidd/request"
    +#define UUIDD_PIDFILE_PATH "/var/run/uuidd/uuidd.pid"
    +#define UUIDD_PATH "/usr/sbin/uuidd"
    +
    +#define UUIDD_OP_GETPID 0
    +#define UUIDD_OP_GET_MAXOP 1
    +#define UUIDD_OP_TIME_UUID 2
    +#define UUIDD_OP_RANDOM_UUID 3
    +#define UUIDD_OP_BULK_TIME_UUID 4
    +#define UUIDD_OP_BULK_RANDOM_UUID 5
    +#define UUIDD_MAX_OP UUIDD_OP_BULK_RANDOM_UUID
    +
    +extern void uuid__generate_time(uuid_t out, int *num);
    +extern void uuid__generate_random(uuid_t out, int *num);
    +
    +#endif /* _UUID_UUID_H */
    diff --git a/misc/Makefile.in b/misc/Makefile.in
    index db18985..1d4444a 100644
    --- a/misc/Makefile.in
    +++ b/misc/Makefile.in
    @@ -15,11 +15,11 @@ INSTALL = @INSTALL@
    @IMAGER_CMT@E2IMAGE_MAN= e2image.8

    SPROGS= mke2fs badblocks tune2fs dumpe2fs blkid logsave \
    - $(E2IMAGE_PROG) @FSCK_PROG@
    -USPROGS= mklost+found filefrag
    + $(E2IMAGE_PROG) @FSCK_PROG@
    +USPROGS= mklost+found filefrag uuidd
    SMANPAGES= tune2fs.8 mklost+found.8 mke2fs.8 dumpe2fs.8 badblocks.8 \
    e2label.8 findfs.8 blkid.8 $(E2IMAGE_MAN) \
    - logsave.8 filefrag.8 @FSCK_MAN@
    + logsave.8 filefrag.8 uuidd.8 @FSCK_MAN@
    FMANPAGES= mke2fs.conf.5

    UPROGS= chattr lsattr uuidgen
    @@ -33,6 +33,7 @@ MKE2FS_OBJS= mke2fs.o util.o profile.o prof_err.o default_profile.o
    CHATTR_OBJS= chattr.o
    LSATTR_OBJS= lsattr.o
    UUIDGEN_OBJS= uuidgen.o
    +UUIDD_OBJS= uuidd.o
    DUMPE2FS_OBJS= dumpe2fs.o
    BADBLOCKS_OBJS= badblocks.o
    E2IMAGE_OBJS= e2image.o
    @@ -144,6 +145,10 @@ uuidgen: $(UUIDGEN_OBJS) $(DEPLIBUUID)
    @echo " LD $@"
    @$(CC) $(ALL_LDFLAGS) -o uuidgen $(UUIDGEN_OBJS) $(LIBUUID) $(LIBINTL)

    +uuidd: $(UUIDD_OBJS) $(DEPLIBUUID)
    + @echo " LD $@"
    + @$(CC) $(ALL_LDFLAGS) -o uuidd $(UUIDD_OBJS) $(LIBUUID) $(LIBINTL)
    +
    dumpe2fs: $(DUMPE2FS_OBJS) $(DEPLIBS) $(DEPLIBS_E2P) $(DEPLIBUUID)
    @echo " LD $@"
    @$(CC) $(ALL_LDFLAGS) -o dumpe2fs $(DUMPE2FS_OBJS) $(LIBS) \
    @@ -213,6 +218,10 @@ logsave.8: $(DEP_SUBSTITUTE) $(srcdir)/logsave.8.in
    @echo " SUBST $@"
    @$(SUBSTITUTE_UPTIME) $(srcdir)/logsave.8.in logsave.8

    +uuidd.8: $(DEP_SUBSTITUTE) $(srcdir)/uuidd.8.in
    + @echo " SUBST $@"
    + @$(SUBSTITUTE_UPTIME) $(srcdir)/uuidd.8.in uuidd.8
    +
    chattr.1: $(DEP_SUBSTITUTE) $(srcdir)/chattr.1.in
    @echo " SUBST $@"
    @$(SUBSTITUTE_UPTIME) $(srcdir)/chattr.1.in chattr.1
    @@ -239,7 +248,8 @@ installdirs:
    $(DESTDIR)$(root_sbindir) $(DESTDIR)$(bindir) \
    $(DESTDIR)$(man1dir) $(DESTDIR)$(man8dir) \
    $(DESTDIR)$(man1dir) $(DESTDIR)$(man5dir) \
    - $(DESTDIR)$(libdir) $(DESTDIR)/$(root_sysconfdir)
    + $(DESTDIR)$(libdir) $(DESTDIR)/$(root_sysconfdir) \
    + $(DESTDIR)/etc/init.d

    install: all $(SMANPAGES) $(UMANPAGES) installdirs
    @for i in $(SPROGS); do \
    diff --git a/misc/uuidd.8.in b/misc/uuidd.8.in
    new file mode 100644
    index 0000000..e45297d
    --- /dev/null
    +++ b/misc/uuidd.8.in
    @@ -0,0 +1,97 @@
    +.\" -*- nroff -*-
    +.\" Copyright 2007 by Theodore Ts'o. All Rights Reserved.
    +.\" This file may be copied under the terms of the GNU Public License.
    +.\"
    +.TH UUIDD 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
    +.SH NAME
    +uuidd \- UUID generation daemon
    +.SH SYNOPSIS
    +.B uuidd
    +[
    +.B \-d
    +]
    +[
    +.B \-p
    +.I pidfile
    +]
    +[
    +.B \-s
    +.I socketpath
    +]
    +[
    +.B \-T
    +.I timeout
    +]
    +
    +.B uuidd
    +[
    +.B \-r
    +|
    +.B \-t
    +]
    +[
    +.B \-n
    +.I number
    +]
    +[
    +.B \-s
    +.I socketpath
    +]
    +
    +.B uuidd \-k
    +.SH DESCRIPTION
    +The
    +.B uuidd
    +daemon is used by the UUID library to generate
    +universally unique identifiers (UUIDs), especially time-based UUID's
    +in a secure and guaranteed-unique fashion, even in the face of large
    +numbers of threads trying to grab UUID's running on different CPU's.
    +.SH OPTIONS
    +.TP
    +.B \-d
    +Run
    +.B uuidd
    +in debugging mode. This prevents uuidd from running as a daemon.
    +.TP
    +.B \-k
    +If a currently uuidd daemon is running, kill it.
    +.TP
    +.BI \-n " number"
    +When issuing a test request to a running uuidd, request a bulk response
    +of
    +.I number
    +UUID's.
    +.TP
    +.BI \-p " pidfile"
    +Specify the pathname where the pid file should be written. By default,
    +the pid file is written to /var/run/uuidd.pid.
    +.TP
    +.BI \-s " socketpath"
    +Specify the pathname used for the unix-domain socket used by uuidd. By
    +qdefault, the pathname used is /var/run/uuidd.sock. This is primarily
    +for debugging purposes, since the pathname is hard-coded in the libuuid
    +library.
    +.TP
    +.B \-r
    +Test uuidd by trying to connect to a running uuidd daemon and
    +request it to return a random-based UUID.
    +.TP
    +.B \-t
    +Test uuidd by trying to connect to a running uuidd daemon and
    +request it to return a time-based UUID.
    +.TP
    +.BI \-T " timeout"
    +Specify a timeout for uuidd. If specified, then uuidd will exit after
    +.I timeout
    +seconds of inactivity.
    +.SH AUTHOR
    +The
    +.B uuidd
    +daemon was written by Theodore Ts'o .
    +.SH AVAILABILITY
    +.B uuidd
    +is part of libuuid from the e2fsprogs package and is available from
    +http://e2fsprogs.sourceforge.net.
    +.SH "SEE ALSO"
    +.BR libuuid (3),
    +.BR uuidgen (1)
    diff --git a/misc/uuidd.c b/misc/uuidd.c
    new file mode 100644
    index 0000000..19c8624
    --- /dev/null
    +++ b/misc/uuidd.c
    @@ -0,0 +1,518 @@
    +/*
    + * uuidd.c --- UUID-generation daemon
    + *
    + * Copyright (C) 2007 Theodore Ts'o
    + *
    + * %Begin-Header%
    + * This file may be redistributed under the terms of the GNU Public
    + * License.
    + * %End-Header%
    + */
    +
    +#include
    +#ifdef HAVE_STDLIB_H
    +#include
    +#endif
    +#include
    +#include
    +#include
    +#include
    +#include
    +#include
    +#include
    +#include
    +#include
    +#ifdef HAVE_GETOPT_H
    +#include
    +#else
    +extern int getopt(int argc, char * const argv[], const char *optstring);
    +extern char *optarg;
    +extern int optind;
    +#endif
    +#include "uuid/uuid.h"
    +#include "uuid/uuidd.h"
    +#include "nls-enable.h"
    +
    +#ifdef __GNUC__
    +#define CODE_ATTR(x) __attribute__(x)
    +#else
    +#define CODE_ATTR(x)
    +#endif
    +
    +static void usage(const char *progname)
    +{
    + fprintf(stderr, _("Usage: %s [-d] [-p pidfile] [-s socketpath] "
    + "[-T timeout]\n"), progname);
    + fprintf(stderr, _(" %s [-r|t] [-n num] [-s socketpath]\n"),
    + progname);
    + fprintf(stderr, _(" %s -k\n"), progname);
    + exit(1);
    +}
    +
    +static void create_daemon(const char *pidfile_path)
    +{
    + pid_t pid;
    + uid_t euid;
    + FILE *f;
    +
    + pid = fork();
    + if (pid == -1) {
    + perror("fork");
    + exit(1);
    + } else if (pid != 0) {
    + exit(0);
    + }
    +
    + close(0);
    + close(1);
    + close(2);
    + open("/dev/null", O_RDWR);
    + open("/dev/null", O_RDWR);
    + open("/dev/null", O_RDWR);
    +
    + chdir("/");
    + (void) setsid();
    + euid = geteuid();
    + (void) setreuid(euid, euid);
    +
    + f = fopen(pidfile_path, "w");
    + if (f) {
    + fprintf(f, "%d\n", getpid());
    + fclose(f);
    + }
    +}
    +
    +static int read_all(int fd, char *buf, size_t count)
    +{
    + ssize_t ret;
    + int c = 0;
    +
    + memset(buf, 0, count);
    + while (count > 0) {
    + ret = read(fd, buf, count);
    + if (ret < 0) {
    + if ((errno == EAGAIN) || (errno == EINTR))
    + continue;
    + return -1;
    + }
    + count -= ret;
    + buf += ret;
    + c += ret;
    + }
    + return c;
    +}
    +
    +static const char *cleanup_pidfile, *cleanup_socket;
    +
    +static void terminate_intr(int signo CODE_ATTR((unused)))
    +{
    + (void) unlink(cleanup_pidfile);
    + (void) unlink(cleanup_socket);
    + exit(0);
    +}
    +
    +static void server_loop(const char *socket_path, int debug,
    + const char *pidfile_path,
    + int timeout, int quiet)
    +{
    + struct sockaddr_un my_addr, from_addr;
    + unsigned char reply_buf[1024], *cp;
    + socklen_t fromlen;
    + int32_t reply_len = 0;
    + uuid_t uu;
    + mode_t save_umask;
    + char op, str[37];
    + int i, s, ns, len, num;
    +
    + if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
    + if (!quiet)
    + fprintf(stderr, _("Couldn't create unix stream "
    + "socket: %s"), strerror(errno));
    + exit(1);
    + }
    +
    + /*
    + * Create the address we will be binding to.
    + */
    + my_addr.sun_family = AF_UNIX;
    + strcpy(my_addr.sun_path, socket_path);
    + (void) unlink(socket_path);
    + save_umask = umask(0);
    + if (bind(s, (const struct sockaddr *) &my_addr,
    + sizeof(struct sockaddr_un)) < 0) {
    + if (!quiet)
    + fprintf(stderr,
    + _("Couldn't bind unix socket %s: %s\n"),
    + socket_path, strerror(errno));
    + exit(1);
    + }
    + (void) umask(save_umask);
    +
    + if (listen(s, 5) < 0) {
    + if (!quiet)
    + fprintf(stderr, _("Couldn't listen on unix "
    + "socket %s: %s\n"), socket_path,
    + strerror(errno));
    + exit(1);
    + }
    +
    + if (!debug) {
    + create_daemon(pidfile_path);
    + cleanup_pidfile = pidfile_path;
    + cleanup_socket = socket_path;
    + signal(SIGHUP, terminate_intr);
    + signal(SIGINT, terminate_intr);
    + signal(SIGPIPE, terminate_intr);
    + signal(SIGTERM, terminate_intr);
    + signal(SIGALRM, terminate_intr);
    + }
    + signal(SIGPIPE, SIG_IGN);
    +
    + while (1) {
    + fromlen = sizeof(from_addr);
    + if (timeout > 0)
    + alarm(timeout);
    + ns = accept(s, (struct sockaddr *) &from_addr, &fromlen);
    + alarm(0);
    + if (ns < 0) {
    + if ((errno == EAGAIN) || (errno == EINTR))
    + continue;
    + perror("accept");
    + exit(1);
    + }
    + len = read(ns, &op, 1);
    + if (len != 1) {
    + if (len < 0)
    + perror("read");
    + else
    + printf(_("Error reading from client, "
    + "len = %d\n"), len);
    + goto shutdown_socket;
    + }
    + if ((op == 4) || (op == 5)) {
    + if (read_all(ns, (char *) &num, sizeof(num)) != 4)
    + goto shutdown_socket;
    + if (debug)
    + printf(_("operation %d, incoming num = %d\n"),
    + op, num);
    + } else if (debug)
    + printf("operation %d\n", op);
    +
    + switch(op) {
    + case UUIDD_OP_GETPID:
    + sprintf((char *) reply_buf, "%d", getpid());
    + reply_len = strlen((char *) reply_buf)+1;
    + break;
    + case UUIDD_OP_GET_MAXOP:
    + sprintf((char *) reply_buf, "%d", UUIDD_MAX_OP);
    + reply_len = strlen((char *) reply_buf)+1;
    + break;
    + case UUIDD_OP_TIME_UUID:
    + num = 1;
    + uuid__generate_time(uu, &num);
    + if (debug) {
    + uuid_unparse(uu, str);
    + printf(_("Generated time UUID: %s\n"), str);
    + }
    + memcpy(reply_buf, uu, sizeof(uu));
    + reply_len = sizeof(uu);
    + break;
    + case UUIDD_OP_RANDOM_UUID:
    + num = 1;
    + uuid__generate_random(uu, &num);
    + if (debug) {
    + uuid_unparse(uu, str);
    + printf(_("Generated random UUID: %s\n"), str);
    + }
    + memcpy(reply_buf, uu, sizeof(uu));
    + reply_len = sizeof(uu);
    + break;
    + case UUIDD_OP_BULK_TIME_UUID:
    + uuid__generate_time(uu, &num);
    + if (debug) {
    + uuid_unparse(uu, str);
    + printf(_("Generated time UUID %s and %d "
    + "following\n"), str, num);
    + }
    + memcpy(reply_buf, uu, sizeof(uu));
    + reply_len = sizeof(uu);
    + memcpy(reply_buf+reply_len, &num, sizeof(num));
    + reply_len += sizeof(num);
    + break;
    + case UUIDD_OP_BULK_RANDOM_UUID:
    + if (num < 0)
    + num = 1;
    + if (num > 1000)
    + num = 1000;
    + if (num*16 > (int) (sizeof(reply_buf)-sizeof(num)))
    + num = (sizeof(reply_buf)-sizeof(num)) / 16;
    + uuid__generate_random(reply_buf+sizeof(num), &num);
    + if (debug) {
    + printf(_("Generated %d UUID's:\n"), num);
    + for (i=0, cp=reply_buf+sizeof(num);
    + i < num; i++, cp+=16) {
    + uuid_unparse(cp, str);
    + printf("\t%s\n", str);
    + }
    + }
    + reply_len = (num*16) + sizeof(num);
    + memcpy(reply_buf, &num, sizeof(num));
    + break;
    + default:
    + if (debug)
    + printf(_("Invalid operation %d\n"), op);
    + goto shutdown_socket;
    + }
    + write(ns, &reply_len, sizeof(reply_len));
    + write(ns, reply_buf, reply_len);
    + shutdown_socket:
    + close(ns);
    + }
    +}
    +
    +static int call_daemon(const char *socket_path, int op, unsigned char *buf,
    + int buflen, int *num, const char **err_context)
    +{
    + char op_buf[8];
    + int op_len;
    + int s;
    + ssize_t ret;
    + int32_t reply_len = 0;
    + struct sockaddr_un srv_addr;
    +
    + if (((op == 4) || (op == 5)) && !num) {
    + if (err_context)
    + *err_context = _("bad arguments");
    + errno = EINVAL;
    + return -1;
    + }
    +
    + if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
    + if (err_context)
    + *err_context = _("socket");
    + return -1;
    + }
    +
    + srv_addr.sun_family = AF_UNIX;
    + strcpy(srv_addr.sun_path, socket_path);
    +
    + if (connect(s, (const struct sockaddr *) &srv_addr,
    + sizeof(struct sockaddr_un)) < 0) {
    + if (err_context)
    + *err_context = _("connect");
    + close(s);
    + return -1;
    + }
    +
    + if (op == 5) {
    + if ((*num)*16 > buflen-4)
    + *num = (buflen-4) / 16;
    + }
    + op_buf[0] = op;
    + op_len = 1;
    + if ((op == 4) || (op == 5)) {
    + memcpy(op_buf+1, num, sizeof(int));
    + op_len += sizeof(int);
    + }
    +
    + ret = write(s, op_buf, op_len);
    + if (ret < op_len) {
    + if (err_context)
    + *err_context = _("write");
    + close(s);
    + return -1;
    + }
    +
    + ret = read_all(s, (char *) &reply_len, sizeof(reply_len));
    + if (ret < 0) {
    + if (err_context)
    + *err_context = _("read count");
    + close(s);
    + return -1;
    + }
    + if (reply_len < 0 || reply_len > buflen) {
    + if (err_context)
    + *err_context = _("bad response length");
    + close(s);
    + return -1;
    + }
    + ret = read_all(s, (char *) buf, reply_len);
    +
    + if ((ret > 0) && (op == 4)) {
    + if (reply_len >= (int) (16+sizeof(int)))
    + memcpy(buf+16, num, sizeof(int));
    + else
    + *num = -1;
    + }
    + if ((ret > 0) && (op == 5)) {
    + if (*num >= (int) sizeof(int))
    + memcpy(buf, num, sizeof(int));
    + else
    + *num = -1;
    + }
    +
    + close(s);
    +
    + return ret;
    +}
    +
    +
    +int main(int argc, char **argv)
    +{
    + const char *socket_path = UUIDD_SOCKET_PATH;
    + const char *pidfile_path = UUIDD_PIDFILE_PATH;
    + const char *err_context;
    + unsigned char buf[1024], *cp;
    + char str[37], *tmp;
    + uuid_t uu;
    + uid_t uid;
    + gid_t gid;
    + int i, c, ret;
    + int debug = 0, do_type = 0, do_kill = 0, num = 0;
    + int timeout = 0, quiet = 0, drop_privs = 0;
    +
    +#ifdef ENABLE_NLS
    + setlocale(LC_MESSAGES, "");
    + setlocale(LC_CTYPE, "");
    + bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
    + textdomain(NLS_CAT_NAME);
    +#endif
    +
    + while ((c = getopt (argc, argv, "dkn:qp:s:tT:r")) != EOF) {
    + switch (c) {
    + case 'd':
    + debug++;
    + drop_privs++;
    + break;
    + case 'k':
    + do_kill++;
    + drop_privs++;
    + break;
    + case 'n':
    + num = strtol(optarg, &tmp, 0);
    + if ((num < 0) || *tmp) {
    + fprintf(stderr, _("Bad number: %s\n"), optarg);
    + exit(1);
    + }
    + case 'p':
    + pidfile_path = optarg;
    + drop_privs++;
    + break;
    + case 'q':
    + quiet++;
    + break;
    + case 's':
    + socket_path = optarg;
    + drop_privs++;
    + break;
    + case 't':
    + do_type = UUIDD_OP_TIME_UUID;
    + drop_privs++;
    + break;
    + case 'T':
    + timeout = strtol(optarg, &tmp, 0);
    + if ((timeout < 0) || *tmp) {
    + fprintf(stderr, _("Bad number: %s\n"), optarg);
    + exit(1);
    + }
    + break;
    + case 'r':
    + do_type = UUIDD_OP_RANDOM_UUID;
    + drop_privs++;
    + break;
    + default:
    + usage(argv[0]);
    + }
    + }
    + uid = getuid();
    + if (uid && drop_privs) {
    + gid = getgid();
    +#ifdef HAVE_SETRESUID
    + setresuid(uid, uid, uid);
    +#else
    + setreuid(uid, uid);
    +#endif
    +#ifdef HAVE_SETRESGID
    + setresgid(gid, gid, gid);
    +#else
    + setregid(gid, gid);
    +#endif
    + }
    + if (num && do_type) {
    + ret = call_daemon(socket_path, do_type+2, buf,
    + sizeof(buf), &num, &err_context);
    + if (ret < 0) {
    + printf(_("Error calling uuidd daemon (%s): %s\n"),
    + err_context, strerror(errno));
    + exit(1);
    + }
    + if (do_type == UUIDD_OP_TIME_UUID) {
    + if (ret != sizeof(uu) + sizeof(num))
    + goto unexpected_size;
    +
    + uuid_unparse(buf, str);
    +
    + printf(_("%s and subsequent %d UUID's\n"), str, num);
    + } else {
    + printf(_("List of UUID's:\n"));
    + cp = buf + 4;
    + if (ret != sizeof(num) + num*sizeof(uu))
    + goto unexpected_size;
    + for (i=0; i < num; i++, cp+=16) {
    + uuid_unparse(cp, str);
    + printf("\t%s\n", str);
    + }
    + }
    + exit(0);
    + }
    + if (do_type) {
    + ret = call_daemon(socket_path, do_type, (unsigned char *) &uu,
    + sizeof(uu), 0, &err_context);
    + if (ret < 0) {
    + printf(_("Error calling uuidd daemon (%s): %s\n"),
    + err_context, strerror(errno));
    + exit(1);
    + }
    + if (ret != sizeof(uu)) {
    + unexpected_size:
    + printf(_("Unexpected reply length from server %d\n"),
    + ret);
    + exit(1);
    + }
    + uuid_unparse(uu, str);
    +
    + printf("%s\n", str);
    + exit(0);
    + }
    +
    + /*
    + * Check to make sure there isn't another daemon running already
    + */
    + ret = call_daemon(socket_path, 0, buf, sizeof(buf), 0, 0);
    + if (ret > 0) {
    + if (do_kill && ((do_kill = atoi((char *) buf)) > 0)) {
    + ret = kill(do_kill, SIGTERM);
    + if (ret < 0) {
    + if (!quiet)
    + fprintf(stderr,
    + _("Couldn't kill uuidd running "
    + "at pid %d: %s\n"), do_kill,
    + strerror(errno));
    + exit(1);
    + }
    + if (!quiet)
    + printf(_("Killed uuidd running at pid %d\n"),
    + do_kill);
    + exit(0);
    + }
    + if (!quiet)
    + printf(_("uuidd daemon already running at pid %s\n"),
    + buf);
    + exit(1);
    + }
    + if (do_kill)
    + exit(0); /* Nothing to kill */
    +
    + server_loop(socket_path, debug, pidfile_path, timeout, quiet);
    + return 0;
    +}
    diff --git a/misc/uuidd.rc b/misc/uuidd.rc
    new file mode 100644
    index 0000000..d35645a
    --- /dev/null
    +++ b/misc/uuidd.rc
    @@ -0,0 +1,55 @@
    +#! /bin/sh -e
    +### BEGIN INIT INFO
    +# Provides: uuidd
    +# Required-Start: $time $local_fs
    +# Required-Stop: $time $local_fs
    +# Default-Start: 2 3 4 5
    +# Default-Stop: 0 1 6
    +# Short-Description: uuidd daemon
    +# Description: Init script for the uuid generation daemon
    +### END INIT INFO
    +#
    +# Author: "Theodore Ts'o"
    +#
    +set -e
    +
    +PATH=/bin:/usr/bin:/sbin:/usr/sbin
    +DAEMON=/usr/sbin/uuidd
    +PIDFILE=/var/run/uuidd/uuidd.pid
    +
    +test -x $DAEMON || exit 0
    +
    +. /lib/lsb/init-functions
    +
    +case "$1" in
    + start)
    + log_daemon_msg "Starting uuid generator" "uuidd"
    + start_daemon -p $PIDFILE $DAEMON
    + log_end_msg $?
    + ;;
    + stop)
    + log_daemon_msg "Stopping uuidd generator" "uuidd"
    + killproc -p $PIDFILE $DAEMON
    + log_end_msg $?
    + ;;
    + status)
    + if pidofproc -p $PIDFILE $DAEMON >& /dev/null ; then
    + echo "$DAEMON is running";
    + exit 0;
    + else
    + echo "$DAEMON is NOT running";
    + if test -f /var/run/uuidd.pid; then exit 2; fi
    + exit 3;
    + fi
    + ;;
    + force-reload|restart)
    + $0 stop
    + $0 start
    + ;;
    + *)
    + echo "Usage: /etc/init.d/uuidd {start|stop|restart|force-reload}"
    + exit 1
    + ;;
    +esac
    +
    +exit 0
    --
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