lock_daemon.c 41.9 KB
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/*
 * lock_daemon.c: lock management daemon
 *
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 * Copyright (C) 2006-2014 Red Hat, Inc.
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 *
 * 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, see
 * <http://www.gnu.org/licenses/>.
 *
 * Author: Daniel P. Berrange <berrange@redhat.com>
 */

#include <config.h>

#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <getopt.h>
#include <stdlib.h>
#include <locale.h>


#include "lock_daemon.h"
#include "lock_daemon_config.h"
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#include "virutil.h"
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#include "virfile.h"
#include "virpidfile.h"
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#include "virprocess.h"
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#include "virerror.h"
41
#include "virlog.h"
42
#include "viralloc.h"
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#include "virconf.h"
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#include "rpc/virnetserver.h"
#include "virrandom.h"
#include "virhash.h"
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#include "viruuid.h"
48
#include "virstring.h"
49

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#include "locking/lock_daemon_dispatch.h"
#include "locking/lock_protocol.h"

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#include "configmake.h"

#define VIR_FROM_THIS VIR_FROM_LOCKING

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VIR_LOG_INIT("locking.lock_daemon");

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#define VIR_LOCK_DAEMON_NUM_LOCKSPACES 3

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struct _virLockDaemon {
    virMutex lock;
    virNetServerPtr srv;
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    virHashTablePtr lockspaces;
    virLockSpacePtr defaultLockspace;
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};

virLockDaemonPtr lockDaemon = NULL;

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static bool execRestart = false;

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enum {
    VIR_LOCK_DAEMON_ERR_NONE = 0,
    VIR_LOCK_DAEMON_ERR_PIDFILE,
    VIR_LOCK_DAEMON_ERR_RUNDIR,
    VIR_LOCK_DAEMON_ERR_INIT,
    VIR_LOCK_DAEMON_ERR_SIGNAL,
    VIR_LOCK_DAEMON_ERR_PRIVS,
    VIR_LOCK_DAEMON_ERR_NETWORK,
    VIR_LOCK_DAEMON_ERR_CONFIG,
    VIR_LOCK_DAEMON_ERR_HOOKS,
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    VIR_LOCK_DAEMON_ERR_REEXEC,
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    VIR_LOCK_DAEMON_ERR_LAST
};

VIR_ENUM_DECL(virDaemonErr)
VIR_ENUM_IMPL(virDaemonErr, VIR_LOCK_DAEMON_ERR_LAST,
              "Initialization successful",
              "Unable to obtain pidfile",
              "Unable to create rundir",
              "Unable to initialize libvirt",
              "Unable to setup signal handlers",
              "Unable to drop privileges",
              "Unable to initialize network sockets",
              "Unable to load configuration file",
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              "Unable to look for hook scripts",
              "Unable to re-execute daemon");
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static void *
virLockDaemonClientNew(virNetServerClientPtr client,
                       void *opaque);
static void
virLockDaemonClientFree(void *opaque);

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static void *
virLockDaemonClientNewPostExecRestart(virNetServerClientPtr client,
                                      virJSONValuePtr object,
                                      void *opaque);
static virJSONValuePtr
virLockDaemonClientPreExecRestart(virNetServerClientPtr client,
                                  void *opaque);

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static void
virLockDaemonFree(virLockDaemonPtr lockd)
{
    if (!lockd)
        return;

    virObjectUnref(lockd->srv);
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    virHashFree(lockd->lockspaces);
    virLockSpaceFree(lockd->defaultLockspace);
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    VIR_FREE(lockd);
}


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static void virLockDaemonLockSpaceDataFree(void *data,
                                           const void *key ATTRIBUTE_UNUSED)
{
    virLockSpaceFree(data);
}

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static virLockDaemonPtr
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virLockDaemonNew(virLockDaemonConfigPtr config, bool privileged)
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{
    virLockDaemonPtr lockd;

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    if (VIR_ALLOC(lockd) < 0)
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        return NULL;

    if (virMutexInit(&lockd->lock) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Unable to initialize mutex"));
        VIR_FREE(lockd);
        return NULL;
    }

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    if (!(lockd->srv = virNetServerNew(1, 1, 0, config->max_clients,
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                                       config->max_clients, -1, 0,
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                                       false, NULL,
                                       virLockDaemonClientNew,
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                                       virLockDaemonClientPreExecRestart,
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                                       virLockDaemonClientFree,
                                       (void*)(intptr_t)(privileged ? 0x1 : 0x0))))
        goto error;

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    if (!(lockd->lockspaces = virHashCreate(VIR_LOCK_DAEMON_NUM_LOCKSPACES,
                                            virLockDaemonLockSpaceDataFree)))
        goto error;

    if (!(lockd->defaultLockspace = virLockSpaceNew(NULL)))
        goto error;

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    return lockd;

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 error:
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    virLockDaemonFree(lockd);
    return NULL;
}


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static virLockDaemonPtr
virLockDaemonNewPostExecRestart(virJSONValuePtr object, bool privileged)
{
    virLockDaemonPtr lockd;
    virJSONValuePtr child;
    virJSONValuePtr lockspaces;
    size_t i;
    int n;

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    if (VIR_ALLOC(lockd) < 0)
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        return NULL;

    if (virMutexInit(&lockd->lock) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Unable to initialize mutex"));
        VIR_FREE(lockd);
        return NULL;
    }

    if (!(lockd->lockspaces = virHashCreate(VIR_LOCK_DAEMON_NUM_LOCKSPACES,
                                            virLockDaemonLockSpaceDataFree)))
        goto error;

    if (!(child = virJSONValueObjectGet(object, "defaultLockspace"))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing defaultLockspace data from JSON file"));
        goto error;
    }

    if (!(lockd->defaultLockspace =
          virLockSpaceNewPostExecRestart(child)))
        goto error;

    if (!(lockspaces = virJSONValueObjectGet(object, "lockspaces"))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing lockspaces data from JSON file"));
        goto error;
    }

    if ((n = virJSONValueArraySize(lockspaces)) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Malformed lockspaces data from JSON file"));
        goto error;
    }

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    for (i = 0; i < n; i++) {
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        virLockSpacePtr lockspace;

        child = virJSONValueArrayGet(lockspaces, i);

        if (!(lockspace = virLockSpaceNewPostExecRestart(child)))
            goto error;

        if (virHashAddEntry(lockd->lockspaces,
                            virLockSpaceGetDirectory(lockspace),
                            lockspace) < 0) {
            virLockSpaceFree(lockspace);
        }
    }

    if (!(child = virJSONValueObjectGet(object, "server"))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing server data from JSON file"));
        goto error;
    }

    if (!(lockd->srv = virNetServerNewPostExecRestart(child,
                                                      virLockDaemonClientNew,
                                                      virLockDaemonClientNewPostExecRestart,
                                                      virLockDaemonClientPreExecRestart,
                                                      virLockDaemonClientFree,
                                                      (void*)(intptr_t)(privileged ? 0x1 : 0x0))))
        goto error;

    return lockd;

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 error:
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    virLockDaemonFree(lockd);
    return NULL;
}


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int virLockDaemonAddLockSpace(virLockDaemonPtr lockd,
                              const char *path,
                              virLockSpacePtr lockspace)
{
    int ret;
    virMutexLock(&lockd->lock);
    ret = virHashAddEntry(lockd->lockspaces, path, lockspace);
    virMutexUnlock(&lockd->lock);
    return ret;
}

virLockSpacePtr virLockDaemonFindLockSpace(virLockDaemonPtr lockd,
                                           const char *path)
{
    virLockSpacePtr lockspace;
    virMutexLock(&lockd->lock);
    if (path && STRNEQ(path, ""))
        lockspace = virHashLookup(lockd->lockspaces, path);
    else
        lockspace = lockd->defaultLockspace;
    virMutexUnlock(&lockd->lock);
    return lockspace;
}


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static int
virLockDaemonForkIntoBackground(const char *argv0)
{
    int statuspipe[2];
    if (pipe(statuspipe) < 0)
        return -1;

    pid_t pid = fork();
    switch (pid) {
    case 0:
        {
            int stdinfd = -1;
            int stdoutfd = -1;
            int nextpid;

            VIR_FORCE_CLOSE(statuspipe[0]);

            if ((stdinfd = open("/dev/null", O_RDONLY)) < 0)
                goto cleanup;
            if ((stdoutfd = open("/dev/null", O_WRONLY)) < 0)
                goto cleanup;
            if (dup2(stdinfd, STDIN_FILENO) != STDIN_FILENO)
                goto cleanup;
            if (dup2(stdoutfd, STDOUT_FILENO) != STDOUT_FILENO)
                goto cleanup;
            if (dup2(stdoutfd, STDERR_FILENO) != STDERR_FILENO)
                goto cleanup;
            if (VIR_CLOSE(stdinfd) < 0)
                goto cleanup;
            if (VIR_CLOSE(stdoutfd) < 0)
                goto cleanup;

            if (setsid() < 0)
                goto cleanup;

            nextpid = fork();
            switch (nextpid) {
            case 0:
                return statuspipe[1];
            case -1:
                return -1;
            default:
                _exit(0);
            }

        cleanup:
            VIR_FORCE_CLOSE(stdoutfd);
            VIR_FORCE_CLOSE(stdinfd);
            return -1;

        }

    case -1:
        return -1;

    default:
        {
            int got, exitstatus = 0;
            int ret;
            char status;

            VIR_FORCE_CLOSE(statuspipe[1]);

            /* We wait to make sure the first child forked successfully */
            if ((got = waitpid(pid, &exitstatus, 0)) < 0 ||
                got != pid ||
                exitstatus != 0) {
                return -1;
            }

            /* Now block until the second child initializes successfully */
        again:
            ret = read(statuspipe[0], &status, 1);
            if (ret == -1 && errno == EINTR)
                goto again;

            if (ret == 1 && status != 0) {
                fprintf(stderr,
                        _("%s: error: %s. Check /var/log/messages or run without "
                          "--daemon for more info.\n"), argv0,
                        virDaemonErrTypeToString(status));
            }
            _exit(ret == 1 && status == 0 ? 0 : 1);
        }
    }
}


static int
virLockDaemonPidFilePath(bool privileged,
                         char **pidfile)
{
    if (privileged) {
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        if (VIR_STRDUP(*pidfile, LOCALSTATEDIR "/run/virtlockd.pid") < 0)
            goto error;
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    } else {
        char *rundir = NULL;
        mode_t old_umask;

        if (!(rundir = virGetUserRuntimeDirectory()))
            goto error;

        old_umask = umask(077);
        if (virFileMakePath(rundir) < 0) {
            umask(old_umask);
            goto error;
        }
        umask(old_umask);

        if (virAsprintf(pidfile, "%s/virtlockd.pid", rundir) < 0) {
            VIR_FREE(rundir);
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            goto error;
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        }

        VIR_FREE(rundir);
    }

    return 0;

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 error:
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    return -1;
}


static int
virLockDaemonUnixSocketPaths(bool privileged,
                             char **sockfile)
{
    if (privileged) {
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        if (VIR_STRDUP(*sockfile, LOCALSTATEDIR "/run/libvirt/virtlockd-sock") < 0)
            goto error;
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    } else {
        char *rundir = NULL;
        mode_t old_umask;

        if (!(rundir = virGetUserRuntimeDirectory()))
            goto error;

        old_umask = umask(077);
        if (virFileMakePath(rundir) < 0) {
            umask(old_umask);
            goto error;
        }
        umask(old_umask);

        if (virAsprintf(sockfile, "%s/virtlockd-sock", rundir) < 0) {
            VIR_FREE(rundir);
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            goto error;
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        }

        VIR_FREE(rundir);
    }
    return 0;

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 error:
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    return -1;
}


static void
virLockDaemonErrorHandler(void *opaque ATTRIBUTE_UNUSED,
                          virErrorPtr err ATTRIBUTE_UNUSED)
{
    /* Don't do anything, since logging infrastructure already
     * took care of reporting the error */
}


/*
 * Set up the logging environment
 * By default if daemonized all errors go to the logfile libvirtd.log,
 * but if verbose or error debugging is asked for then also output
 * informational and debug messages. Default size if 64 kB.
 */
static int
virLockDaemonSetupLogging(virLockDaemonConfigPtr config,
                          bool privileged,
                          bool verbose,
                          bool godaemon)
{
    virLogReset();

    /*
     * Libvirtd's order of precedence is:
     * cmdline > environment > config
     *
     * In order to achieve this, we must process configuration in
     * different order for the log level versus the filters and
     * outputs. Because filters and outputs append, we have to look at
     * the environment first and then only check the config file if
     * there was no result from the environment. The default output is
     * then applied only if there was no setting from either of the
     * first two. Because we don't have a way to determine if the log
     * level has been set, we must process variables in the opposite
     * order, each one overriding the previous.
     */
    if (config->log_level != 0)
        virLogSetDefaultPriority(config->log_level);

    virLogSetFromEnv();

    if (virLogGetNbFilters() == 0)
        virLogParseFilters(config->log_filters);

    if (virLogGetNbOutputs() == 0)
        virLogParseOutputs(config->log_outputs);

    /*
     * If no defined outputs, and either running
     * as daemon or not on a tty, then first try
     * to direct it to the systemd journal
     * (if it exists)....
     */
    if (virLogGetNbOutputs() == 0 &&
        (godaemon || !isatty(STDIN_FILENO))) {
        char *tmp;
        if (access("/run/systemd/journal/socket", W_OK) >= 0) {
            if (virAsprintf(&tmp, "%d:journald", virLogGetDefaultPriority()) < 0)
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                goto error;
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            virLogParseOutputs(tmp);
            VIR_FREE(tmp);
        }
    }

    /*
     * otherwise direct to libvirtd.log when running
     * as daemon. Otherwise the default output is stderr.
     */
    if (virLogGetNbOutputs() == 0) {
        char *tmp = NULL;

        if (godaemon) {
            if (privileged) {
                if (virAsprintf(&tmp, "%d:file:%s/log/libvirt/virtlockd.log",
                                virLogGetDefaultPriority(),
                                LOCALSTATEDIR) == -1)
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                    goto error;
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            } else {
                char *logdir = virGetUserCacheDirectory();
                mode_t old_umask;

                if (!logdir)
                    goto error;

                old_umask = umask(077);
                if (virFileMakePath(logdir) < 0) {
                    umask(old_umask);
                    goto error;
                }
                umask(old_umask);

                if (virAsprintf(&tmp, "%d:file:%s/virtlockd.log",
                                virLogGetDefaultPriority(), logdir) == -1) {
                    VIR_FREE(logdir);
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                    goto error;
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                }
                VIR_FREE(logdir);
            }
        } else {
            if (virAsprintf(&tmp, "%d:stderr", virLogGetDefaultPriority()) < 0)
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                goto error;
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        }
        virLogParseOutputs(tmp);
        VIR_FREE(tmp);
    }

    /*
     * Command line override for --verbose
     */
    if ((verbose) && (virLogGetDefaultPriority() > VIR_LOG_INFO))
        virLogSetDefaultPriority(VIR_LOG_INFO);

    return 0;

554
 error:
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    return -1;
}



/* Display version information. */
static void
virLockDaemonVersion(const char *argv0)
{
    printf("%s (%s) %s\n", argv0, PACKAGE_NAME, PACKAGE_VERSION);
}

static void
virLockDaemonShutdownHandler(virNetServerPtr srv,
                             siginfo_t *sig ATTRIBUTE_UNUSED,
                             void *opaque ATTRIBUTE_UNUSED)
{
    virNetServerQuit(srv);
}

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static void
virLockDaemonExecRestartHandler(virNetServerPtr srv,
                                siginfo_t *sig ATTRIBUTE_UNUSED,
                                void *opaque ATTRIBUTE_UNUSED)
{
    execRestart = true;
    virNetServerQuit(srv);
}

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static int
virLockDaemonSetupSignals(virNetServerPtr srv)
{
    if (virNetServerAddSignalHandler(srv, SIGINT, virLockDaemonShutdownHandler, NULL) < 0)
        return -1;
    if (virNetServerAddSignalHandler(srv, SIGQUIT, virLockDaemonShutdownHandler, NULL) < 0)
        return -1;
    if (virNetServerAddSignalHandler(srv, SIGTERM, virLockDaemonShutdownHandler, NULL) < 0)
        return -1;
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    if (virNetServerAddSignalHandler(srv, SIGUSR1, virLockDaemonExecRestartHandler, NULL) < 0)
        return -1;
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    return 0;
}

598

599
static int
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virLockDaemonSetupNetworkingSystemD(virNetServerPtr srv)
{
    virNetServerServicePtr svc;
    const char *pidstr;
    const char *fdstr;
    unsigned long long procid;
    unsigned int nfds;

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    VIR_DEBUG("Setting up networking from systemd");

610
    if (!(pidstr = virGetEnvAllowSUID("LISTEN_PID"))) {
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        VIR_DEBUG("No LISTEN_FDS from systemd");
        return 0;
    }

    if (virStrToLong_ull(pidstr, NULL, 10, &procid) < 0) {
        VIR_DEBUG("Malformed LISTEN_PID from systemd %s", pidstr);
        return 0;
    }

    if ((pid_t)procid != getpid()) {
        VIR_DEBUG("LISTEN_PID %s is not for us %llu",
                  pidstr, (unsigned long long)getpid());
        return 0;
    }

626
    if (!(fdstr = virGetEnvAllowSUID("LISTEN_FDS"))) {
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
        VIR_DEBUG("No LISTEN_FDS from systemd");
        return 0;
    }

    if (virStrToLong_ui(fdstr, NULL, 10, &nfds) < 0) {
        VIR_DEBUG("Malformed LISTEN_FDS from systemd %s", fdstr);
        return 0;
    }

    if (nfds > 1) {
        VIR_DEBUG("Too many (%d) file descriptors from systemd",
                  nfds);
        nfds = 1;
    }

    unsetenv("LISTEN_PID");
    unsetenv("LISTEN_FDS");

    if (nfds == 0)
        return 0;

    /* Systemd passes FDs, starting immediately after stderr,
     * so the first FD we'll get is '3'. */
650
    if (!(svc = virNetServerServiceNewFD(3, 0,
651
#if WITH_GNUTLS
652 653 654
                                         NULL,
#endif
                                         false, 1)))
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        return -1;

    if (virNetServerAddService(srv, svc, NULL) < 0) {
        virObjectUnref(svc);
        return -1;
    }
    return 1;
}


static int
virLockDaemonSetupNetworkingNative(virNetServerPtr srv, const char *sock_path)
667 668 669 670 671
{
    virNetServerServicePtr svc;

    VIR_DEBUG("Setting up networking natively");

672
    if (!(svc = virNetServerServiceNewUNIX(sock_path, 0700, 0, 0,
673
#if WITH_GNUTLS
674 675
                                           NULL,
#endif
M
Michal Privoznik 已提交
676
                                           false, 0, 1)))
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        return -1;

    if (virNetServerAddService(srv, svc, NULL) < 0) {
        virObjectUnref(svc);
        return -1;
    }
    return 0;
}


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struct virLockDaemonClientReleaseData {
    virLockDaemonClientPtr client;
    bool hadSomeLeases;
    bool gotError;
};

static void
virLockDaemonClientReleaseLockspace(void *payload,
                                    const void *name ATTRIBUTE_UNUSED,
                                    void *opaque)
{
    virLockSpacePtr lockspace = payload;
    struct virLockDaemonClientReleaseData *data = opaque;
    int rc;

    rc = virLockSpaceReleaseResourcesForOwner(lockspace,
                                              data->client->clientPid);
    if (rc > 0)
        data->hadSomeLeases = true;
    else if (rc < 0)
        data->gotError = true;
}


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static void
virLockDaemonClientFree(void *opaque)
{
    virLockDaemonClientPtr priv = opaque;

    if (!priv)
        return;

719
    VIR_DEBUG("priv=%p client=%lld owner=%lld",
720
              priv,
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              (unsigned long long)priv->clientPid,
              (unsigned long long)priv->ownerPid);

    /* If client & owner match, this is the lock holder */
    if (priv->clientPid == priv->ownerPid) {
        size_t i;
        struct virLockDaemonClientReleaseData data = {
            .client = priv, .hadSomeLeases = false, .gotError = false
        };

        /* Release all locks associated with this
         * owner in all lockspaces */
        virMutexLock(&lockDaemon->lock);
        virHashForEach(lockDaemon->lockspaces,
                       virLockDaemonClientReleaseLockspace,
                       &data);
        virLockDaemonClientReleaseLockspace(lockDaemon->defaultLockspace,
                                            "",
                                            &data);
        virMutexUnlock(&lockDaemon->lock);

        /* If the client had some active leases when it
         * closed the connection, we must kill it off
         * to make sure it doesn't do nasty stuff */
        if (data.gotError || data.hadSomeLeases) {
746
            for (i = 0; i < 15; i++) {
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                int signum;
                if (i == 0)
                    signum = SIGTERM;
                else if (i == 8)
                    signum = SIGKILL;
                else
                    signum = 0;
                if (virProcessKill(priv->clientPid, signum) < 0) {
                    if (errno == ESRCH)
                        break;

                    VIR_WARN("Failed to kill off pid %lld",
                             (unsigned long long)priv->clientPid);
                }
                usleep(200 * 1000);
            }
        }
    }
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    virMutexDestroy(&priv->lock);
    VIR_FREE(priv);
}


static void *
virLockDaemonClientNew(virNetServerClientPtr client,
                       void *opaque)
{
    virLockDaemonClientPtr priv;
    uid_t clientuid;
    gid_t clientgid;
778
    unsigned long long timestamp;
779 780
    bool privileged = opaque != NULL;

781
    if (VIR_ALLOC(priv) < 0)
782 783 784 785
        return NULL;

    if (virMutexInit(&priv->lock) < 0) {
        VIR_FREE(priv);
786
        virReportSystemError(errno, "%s", _("unable to init mutex"));
787 788 789 790 791 792
        return NULL;
    }

    if (virNetServerClientGetUNIXIdentity(client,
                                          &clientuid,
                                          &clientgid,
793 794
                                          &priv->clientPid,
                                          &timestamp) < 0)
795 796 797 798 799 800 801 802
        goto error;

    VIR_DEBUG("New client pid %llu uid %llu",
              (unsigned long long)priv->clientPid,
              (unsigned long long)clientuid);

    if (!privileged) {
        if (geteuid() != clientuid) {
803 804 805
            virReportRestrictedError(_("Disallowing client %llu with uid %llu"),
                                     (unsigned long long)priv->clientPid,
                                     (unsigned long long)clientuid);
806 807 808 809
            goto error;
        }
    } else {
        if (clientuid != 0) {
810 811 812
            virReportRestrictedError(_("Disallowing client %llu with uid %llu"),
                                     (unsigned long long)priv->clientPid,
                                     (unsigned long long)clientuid);
813 814 815 816 817 818
            goto error;
        }
    }

    return priv;

819
 error:
820 821 822 823 824 825
    virMutexDestroy(&priv->lock);
    VIR_FREE(priv);
    return NULL;
}


826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
static void *
virLockDaemonClientNewPostExecRestart(virNetServerClientPtr client,
                                      virJSONValuePtr object,
                                      void *opaque)
{
    virLockDaemonClientPtr priv = virLockDaemonClientNew(client, opaque);
    unsigned int ownerPid;
    const char *ownerUUID;
    const char *ownerName;

    if (!priv)
        return NULL;

    if (virJSONValueObjectGetBoolean(object, "restricted", &priv->restricted) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing restricted data in JSON document"));
        goto error;
    }
    if (virJSONValueObjectGetNumberUint(object, "ownerPid", &ownerPid) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing ownerPid data in JSON document"));
        goto error;
    }
    priv->ownerPid = (pid_t)ownerPid;
    if (virJSONValueObjectGetNumberUint(object, "ownerId", &priv->ownerId) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing ownerId data in JSON document"));
        goto error;
    }
    if (!(ownerName = virJSONValueObjectGetString(object, "ownerName"))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing ownerName data in JSON document"));
        goto error;
    }
860
    if (VIR_STRDUP(priv->ownerName, ownerName) < 0)
861 862 863 864 865 866 867 868 869 870 871 872 873
        goto error;
    if (!(ownerUUID = virJSONValueObjectGetString(object, "ownerUUID"))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing ownerUUID data in JSON document"));
        goto error;
    }
    if (virUUIDParse(ownerUUID, priv->ownerUUID) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing ownerUUID data in JSON document"));
        goto error;
    }
    return priv;

874
 error:
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
    virLockDaemonClientFree(priv);
    return NULL;
}


static virJSONValuePtr
virLockDaemonClientPreExecRestart(virNetServerClientPtr client ATTRIBUTE_UNUSED,
                                  void *opaque)
{
    virLockDaemonClientPtr priv = opaque;
    virJSONValuePtr object = virJSONValueNewObject();
    char uuidstr[VIR_UUID_STRING_BUFLEN];

    if (!object)
        return NULL;

    if (virJSONValueObjectAppendBoolean(object, "restricted", priv->restricted) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot set restricted data in JSON document"));
        goto error;
    }
    if (virJSONValueObjectAppendNumberUint(object, "ownerPid", priv->ownerPid) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot set ownerPid data in JSON document"));
        goto error;
    }
    if (virJSONValueObjectAppendNumberUint(object, "ownerId", priv->ownerId) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot set ownerId data in JSON document"));
        goto error;
    }
    if (virJSONValueObjectAppendString(object, "ownerName", priv->ownerName) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot set ownerName data in JSON document"));
        goto error;
    }
    virUUIDFormat(priv->ownerUUID, uuidstr);
    if (virJSONValueObjectAppendString(object, "ownerUUID", uuidstr) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Cannot set ownerUUID data in JSON document"));
        goto error;
    }

    return object;

920
 error:
921 922 923 924 925
    virJSONValueFree(object);
    return NULL;
}


926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
static int
virLockDaemonExecRestartStatePath(bool privileged,
                                  char **state_file)
{
    if (privileged) {
        if (VIR_STRDUP(*state_file, LOCALSTATEDIR "/run/virtlockd-restart-exec.json") < 0)
            goto error;
    } else {
        char *rundir = NULL;
        mode_t old_umask;

        if (!(rundir = virGetUserRuntimeDirectory()))
            goto error;

        old_umask = umask(077);
        if (virFileMakePath(rundir) < 0) {
            umask(old_umask);
            VIR_FREE(rundir);
            goto error;
        }
        umask(old_umask);

        if (virAsprintf(state_file, "%s/virtlockd-restart-exec.json", rundir) < 0) {
            VIR_FREE(rundir);
            goto error;
        }

        VIR_FREE(rundir);
    }

    return 0;

958
 error:
959 960 961
    return -1;
}

962 963 964 965 966 967

static char *
virLockDaemonGetExecRestartMagic(void)
{
    char *ret;

968
    ignore_value(virAsprintf(&ret, "%lld", (long long int)getpid()));
969 970 971 972 973
    return ret;
}


static int
974 975 976 977
virLockDaemonPostExecRestart(const char *state_file,
                             const char *pid_file,
                             int *pid_file_fd,
                             bool privileged)
978 979 980 981 982 983 984 985 986
{
    const char *gotmagic;
    char *wantmagic = NULL;
    int ret = -1;
    char *state = NULL;
    virJSONValuePtr object = NULL;

    VIR_DEBUG("Running post-restart exec");

987 988 989
    if (!virFileExists(state_file)) {
        VIR_DEBUG("No restart state file %s present",
                  state_file);
990 991 992 993
        ret = 0;
        goto cleanup;
    }

994
    if (virFileReadAll(state_file,
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
                       1024 * 1024 * 10, /* 10 MB */
                       &state) < 0)
        goto cleanup;

    VIR_DEBUG("Loading state %s", state);

    if (!(object = virJSONValueFromString(state)))
        goto cleanup;

    gotmagic = virJSONValueObjectGetString(object, "magic");
    if (!gotmagic) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Missing magic data in JSON document"));
        goto cleanup;
    }

    if (!(wantmagic = virLockDaemonGetExecRestartMagic()))
        goto cleanup;

    if (STRNEQ(gotmagic, wantmagic)) {
        VIR_WARN("Found restart exec file with old magic %s vs wanted %s",
                 gotmagic, wantmagic);
        ret = 0;
        goto cleanup;
    }

1021 1022
    /* Re-claim PID file now as we will not be daemonizing */
    if (pid_file &&
1023
        (*pid_file_fd = virPidFileAcquirePath(pid_file, false, getpid())) < 0)
1024 1025
        goto cleanup;

1026 1027 1028 1029 1030
    if (!(lockDaemon = virLockDaemonNewPostExecRestart(object, privileged)))
        goto cleanup;

    ret = 1;

1031
 cleanup:
1032
    unlink(state_file);
1033 1034 1035 1036 1037 1038 1039 1040
    VIR_FREE(wantmagic);
    VIR_FREE(state);
    virJSONValueFree(object);
    return ret;
}


static int
1041 1042
virLockDaemonPreExecRestart(const char *state_file,
                            virNetServerPtr srv,
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
                            char **argv)
{
    virJSONValuePtr child;
    char *state = NULL;
    int ret = -1;
    virJSONValuePtr object;
    char *magic;
    virHashKeyValuePairPtr pairs = NULL, tmp;
    virJSONValuePtr lockspaces;

    VIR_DEBUG("Running pre-restart exec");

    if (!(object = virJSONValueNewObject()))
        goto cleanup;

    if (!(child = virNetServerPreExecRestart(srv)))
        goto cleanup;

    if (virJSONValueObjectAppend(object, "server", child) < 0) {
        virJSONValueFree(child);
        goto cleanup;
    }

    if (!(child = virLockSpacePreExecRestart(lockDaemon->defaultLockspace)))
        goto cleanup;

    if (virJSONValueObjectAppend(object, "defaultLockspace", child) < 0) {
        virJSONValueFree(child);
        goto cleanup;
    }

    if (!(lockspaces = virJSONValueNewArray()))
        goto cleanup;
    if (virJSONValueObjectAppend(object, "lockspaces", lockspaces) < 0) {
        virJSONValueFree(lockspaces);
        goto cleanup;
    }


    tmp = pairs = virHashGetItems(lockDaemon->lockspaces, NULL);
    while (tmp && tmp->key) {
        virLockSpacePtr lockspace = (virLockSpacePtr)tmp->value;

        if (!(child = virLockSpacePreExecRestart(lockspace)))
            goto cleanup;

        if (virJSONValueArrayAppend(lockspaces, child) < 0) {
            virJSONValueFree(child);
            goto cleanup;
        }

        tmp++;
    }

    if (!(magic = virLockDaemonGetExecRestartMagic()))
        goto cleanup;

    if (virJSONValueObjectAppendString(object, "magic", magic) < 0) {
        VIR_FREE(magic);
        goto cleanup;
    }

    if (!(state = virJSONValueToString(object, true)))
        goto cleanup;

    VIR_DEBUG("Saving state %s", state);

1110
    if (virFileWriteStr(state_file,
1111 1112 1113
                        state, 0700) < 0) {
        virReportSystemError(errno,
                             _("Unable to save state file %s"),
1114
                             state_file);
1115 1116 1117
        goto cleanup;
    }

1118
    if (execvp(argv[0], argv) < 0) {
1119 1120 1121 1122 1123 1124 1125
        virReportSystemError(errno, "%s",
                             _("Unable to restart self"));
        goto cleanup;
    }

    abort(); /* This should be impossible to reach */

1126
 cleanup:
1127 1128 1129 1130 1131 1132 1133
    VIR_FREE(pairs);
    VIR_FREE(state);
    virJSONValueFree(object);
    return ret;
}


1134 1135 1136 1137 1138 1139 1140 1141 1142
static void
virLockDaemonUsage(const char *argv0, bool privileged)
{
    fprintf(stderr,
            _("\n"
              "Usage:\n"
              "  %s [options]\n"
              "\n"
              "Options:\n"
1143
              "  -h | --help            Display program help:\n"
1144 1145 1146
              "  -v | --verbose         Verbose messages.\n"
              "  -d | --daemon          Run as a daemon & write PID file.\n"
              "  -f | --config <file>   Configuration file.\n"
1147
              "  -V | --version         Display version information.\n"
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
              "  -p | --pid-file <file> Change name of PID file.\n"
              "\n"
              "libvirt lock management daemon:\n"), argv0);

    if (privileged) {
        fprintf(stderr,
                _("\n"
                  "  Default paths:\n"
                  "\n"
                  "    Configuration file (unless overridden by -f):\n"
                  "      %s/libvirt/virtlockd.conf\n"
                  "\n"
                  "    Sockets:\n"
                  "      %s/run/libvirt/virtlockd-sock\n"
                  "\n"
                  "    PID file (unless overridden by -p):\n"
                  "      %s/run/virtlockd.pid\n"
                  "\n"),
                SYSCONFDIR,
                LOCALSTATEDIR,
                LOCALSTATEDIR);
    } else {
        fprintf(stderr, "%s",
                _("\n"
                  "  Default paths:\n"
                  "\n"
                  "    Configuration file (unless overridden by -f):\n"
                  "      $XDG_CONFIG_HOME/libvirt/virtlockd.conf\n"
                  "\n"
                  "    Sockets:\n"
                  "      $XDG_RUNTIME_DIR/libvirt/virtlockd-sock\n"
                  "\n"
                  "    PID file:\n"
                  "      $XDG_RUNTIME_DIR/libvirt/virtlockd.pid\n"
                  "\n"));
    }
}

#define MAX_LISTEN 5
int main(int argc, char **argv) {
1188
    virNetServerProgramPtr lockProgram = NULL;
1189 1190 1191 1192 1193 1194 1195 1196 1197
    char *remote_config_file = NULL;
    int statuswrite = -1;
    int ret = 1;
    int verbose = 0;
    int godaemon = 0;
    char *run_dir = NULL;
    char *pid_file = NULL;
    int pid_file_fd = -1;
    char *sock_file = NULL;
1198
    char *state_file = NULL;
1199 1200 1201 1202
    bool implicit_conf = false;
    mode_t old_umask;
    bool privileged = false;
    virLockDaemonConfigPtr config = NULL;
1203
    int rv;
1204 1205

    struct option opts[] = {
1206 1207
        { "verbose", no_argument, &verbose, 'v'},
        { "daemon", no_argument, &godaemon, 'd'},
1208 1209
        { "config", required_argument, NULL, 'f'},
        { "pid-file", required_argument, NULL, 'p'},
1210 1211
        { "version", no_argument, NULL, 'V' },
        { "help", no_argument, NULL, 'h' },
1212 1213 1214
        {0, 0, 0, 0}
    };

1215
    privileged = geteuid() == 0;
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229

    if (setlocale(LC_ALL, "") == NULL ||
        bindtextdomain(PACKAGE, LOCALEDIR) == NULL ||
        textdomain(PACKAGE) == NULL ||
        virThreadInitialize() < 0 ||
        virErrorInitialize() < 0) {
        fprintf(stderr, _("%s: initialization failed\n"), argv[0]);
        exit(EXIT_FAILURE);
    }

    while (1) {
        int optidx = 0;
        int c;

1230
        c = getopt_long(argc, argv, "ldf:p:t:vVh", opts, &optidx);
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248

        if (c == -1) {
            break;
        }

        switch (c) {
        case 0:
            /* Got one of the flags */
            break;
        case 'v':
            verbose = 1;
            break;
        case 'd':
            godaemon = 1;
            break;

        case 'p':
            VIR_FREE(pid_file);
1249 1250
            if (VIR_STRDUP_QUIET(pid_file, optarg) < 0)
                goto no_memory;
1251 1252 1253 1254
            break;

        case 'f':
            VIR_FREE(remote_config_file);
1255 1256
            if (VIR_STRDUP_QUIET(remote_config_file, optarg) < 0)
                goto no_memory;
1257 1258
            break;

1259
        case 'V':
1260
            virLockDaemonVersion(argv[0]);
1261
            exit(EXIT_SUCCESS);
1262

1263
        case 'h':
1264
            virLockDaemonUsage(argv[0], privileged);
1265
            exit(EXIT_SUCCESS);
1266

1267
        case '?':
1268
        default:
1269
            virLockDaemonUsage(argv[0], privileged);
1270 1271 1272 1273
            exit(EXIT_FAILURE);
        }
    }

1274 1275
    virFileActivateDirOverride(argv[0]);

1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
    if (!(config = virLockDaemonConfigNew(privileged))) {
        VIR_ERROR(_("Can't create initial configuration"));
        exit(EXIT_FAILURE);
    }

    /* No explicit config, so try and find a default one */
    if (remote_config_file == NULL) {
        implicit_conf = true;
        if (virLockDaemonConfigFilePath(privileged,
                                        &remote_config_file) < 0) {
            VIR_ERROR(_("Can't determine config path"));
            exit(EXIT_FAILURE);
        }
    }

    /* Read the config file if it exists*/
    if (remote_config_file &&
        virLockDaemonConfigLoadFile(config, remote_config_file, implicit_conf) < 0) {
        virErrorPtr err = virGetLastError();
        if (err && err->message)
            VIR_ERROR(_("Can't load config file: %s: %s"),
                      err->message, remote_config_file);
        else
            VIR_ERROR(_("Can't load config file: %s"), remote_config_file);
        exit(EXIT_FAILURE);
    }

    if (virLockDaemonSetupLogging(config, privileged, verbose, godaemon) < 0) {
        VIR_ERROR(_("Can't initialize logging"));
        exit(EXIT_FAILURE);
    }

    if (!pid_file &&
        virLockDaemonPidFilePath(privileged,
                                 &pid_file) < 0) {
        VIR_ERROR(_("Can't determine pid file path."));
        exit(EXIT_FAILURE);
    }
    VIR_DEBUG("Decided on pid file path '%s'", NULLSTR(pid_file));

    if (virLockDaemonUnixSocketPaths(privileged,
                                     &sock_file) < 0) {
        VIR_ERROR(_("Can't determine socket paths"));
        exit(EXIT_FAILURE);
    }
    VIR_DEBUG("Decided on socket paths '%s'",
              sock_file);

1324 1325 1326 1327
    if (virLockDaemonExecRestartStatePath(privileged,
                                          &state_file) < 0) {
        VIR_ERROR(_("Can't determine restart state file path"));
        exit(EXIT_FAILURE);
1328
    }
1329 1330
    VIR_DEBUG("Decided on restart state file path '%s'",
              state_file);
1331 1332 1333

    /* Ensure the rundir exists (on tmpfs on some systems) */
    if (privileged) {
1334 1335
        if (VIR_STRDUP_QUIET(run_dir, LOCALSTATEDIR "/run/libvirt") < 0)
            goto no_memory;
1336
    } else {
1337
        if (!(run_dir = virGetUserRuntimeDirectory())) {
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
            VIR_ERROR(_("Can't determine user directory"));
            goto cleanup;
        }
    }

    if (privileged)
        old_umask = umask(022);
    else
        old_umask = umask(077);
    VIR_DEBUG("Ensuring run dir '%s' exists", run_dir);
    if (virFileMakePath(run_dir) < 0) {
        char ebuf[1024];
        VIR_ERROR(_("unable to create rundir %s: %s"), run_dir,
                  virStrerror(errno, ebuf, sizeof(ebuf)));
        ret = VIR_LOCK_DAEMON_ERR_RUNDIR;
        goto cleanup;
    }
    umask(old_umask);

1357 1358 1359 1360
    if ((rv = virLockDaemonPostExecRestart(state_file,
                                           pid_file,
                                           &pid_file_fd,
                                           privileged)) < 0) {
1361 1362 1363 1364
        ret = VIR_LOCK_DAEMON_ERR_INIT;
        goto cleanup;
    }

1365
    /* rv == 1, means we setup everything from saved state,
1366 1367 1368
     * so only (possibly) daemonize and setup stuff from
     * scratch if rv == 0
     */
1369
    if (rv == 0) {
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
        if (godaemon) {
            char ebuf[1024];

            if (chdir("/") < 0) {
                VIR_ERROR(_("cannot change to root directory: %s"),
                          virStrerror(errno, ebuf, sizeof(ebuf)));
                goto cleanup;
            }

            if ((statuswrite = virLockDaemonForkIntoBackground(argv[0])) < 0) {
                VIR_ERROR(_("Failed to fork as daemon: %s"),
                          virStrerror(errno, ebuf, sizeof(ebuf)));
                goto cleanup;
            }
        }

        /* If we have a pidfile set, claim it now, exiting if already taken */
1387
        if ((pid_file_fd = virPidFileAcquirePath(pid_file, false, getpid())) < 0) {
1388 1389 1390 1391
            ret = VIR_LOCK_DAEMON_ERR_PIDFILE;
            goto cleanup;
        }

1392
        if (!(lockDaemon = virLockDaemonNew(config, privileged))) {
1393 1394 1395
            ret = VIR_LOCK_DAEMON_ERR_INIT;
            goto cleanup;
        }
1396

1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
        if ((rv = virLockDaemonSetupNetworkingSystemD(lockDaemon->srv)) < 0) {
            ret = VIR_LOCK_DAEMON_ERR_NETWORK;
            goto cleanup;
        }

        /* Only do this, if systemd did not pass a FD */
        if (rv == 0 &&
            virLockDaemonSetupNetworkingNative(lockDaemon->srv, sock_file) < 0) {
            ret = VIR_LOCK_DAEMON_ERR_NETWORK;
            goto cleanup;
        }
1408 1409 1410 1411 1412 1413 1414
    }

    if ((virLockDaemonSetupSignals(lockDaemon->srv)) < 0) {
        ret = VIR_LOCK_DAEMON_ERR_SIGNAL;
        goto cleanup;
    }

1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
    if (!(lockProgram = virNetServerProgramNew(VIR_LOCK_SPACE_PROTOCOL_PROGRAM,
                                               VIR_LOCK_SPACE_PROTOCOL_PROGRAM_VERSION,
                                               virLockSpaceProtocolProcs,
                                               virLockSpaceProtocolNProcs))) {
        ret = VIR_LOCK_DAEMON_ERR_INIT;
        goto cleanup;
    }
    if (virNetServerAddProgram(lockDaemon->srv, lockProgram) < 0) {
        ret = VIR_LOCK_DAEMON_ERR_INIT;
        goto cleanup;
    }

1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
    /* Disable error func, now logging is setup */
    virSetErrorFunc(NULL, virLockDaemonErrorHandler);


    /* Tell parent of daemon that basic initialization is complete
     * In particular we're ready to accept net connections & have
     * written the pidfile
     */
    if (statuswrite != -1) {
        char status = 0;
        while (write(statuswrite, &status, 1) == -1 &&
               errno == EINTR)
            ;
        VIR_FORCE_CLOSE(statuswrite);
    }

    /* Start accepting new clients from network */

    virNetServerUpdateServices(lockDaemon->srv, true);
    virNetServerRun(lockDaemon->srv);
1447 1448

    if (execRestart &&
1449 1450 1451
        virLockDaemonPreExecRestart(state_file,
                                    lockDaemon->srv,
                                    argv) < 0)
1452
        ret = VIR_LOCK_DAEMON_ERR_REEXEC;
1453 1454
    else
        ret = 0;
1455

1456
 cleanup:
1457
    virObjectUnref(lockProgram);
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
    virLockDaemonFree(lockDaemon);
    if (statuswrite != -1) {
        if (ret != 0) {
            /* Tell parent of daemon what failed */
            char status = ret;
            while (write(statuswrite, &status, 1) == -1 &&
                   errno == EINTR)
                ;
        }
        VIR_FORCE_CLOSE(statuswrite);
    }
    if (pid_file_fd != -1)
        virPidFileReleasePath(pid_file, pid_file_fd);
    VIR_FREE(pid_file);
    VIR_FREE(sock_file);
1473
    VIR_FREE(state_file);
1474 1475
    VIR_FREE(run_dir);
    return ret;
1476

1477
 no_memory:
1478 1479
    VIR_ERROR(_("Can't allocate memory"));
    exit(EXIT_FAILURE);
1480
}